[Boutique] Bridge Engineering Internship Report

Part 1: Bridge Engineering Internship Report

Foreword - practice the truth:

Practice is the second classroom of university life, the source of new knowledge and development, the touchstone for testing truth, and the effective way for college students to exercise and grow. A person's knowledge and ability can only be effective in practice, in order to be enriched, improved and developed. For college students to grow up, they must be diligent in practice, combine the theoretical knowledge and practice they have learned, continue to learn in practice, continue to summarize, gradually improve, innovate, and improve their knowledge, ability, wisdom, etc. in practice. The comprehensive elements and abilities of the factors are combined to lay a good foundation for the success of their own business.

Civil engineering is the general term for the disciplines, technologies and engineering of various types of engineering facilities. It refers to all kinds of engineering facilities related to human life and production activities, such as construction, road and urban road engineering, railway engineering, bridge engineering, tunnel engineering, etc. It also refers to the application of materials and equipment on the land. Engineering and technical activities such as survey, design and construction. Civil engineering is one of the pioneers of “clothing, food, housing and travel” required for social and technological development; it plays a pivotal role in the national economy of any country.

As a college student who has just come into contact with professional knowledge, it is unscientific to directly contact esoteric professional knowledge before studying professional courses. For this reason, the college led us to carry out this internship, let us practice this self in practice. The upcoming major will gain a perceptual understanding and lay a solid foundation for the future study of professional courses.

Cognitive internship in bridge engineering:

Before that, I want to introduce knowledge about bridges:

The bridge is based on the main force members, which can be divided into five types: beam bridge, arch bridge, steel bridge, cable-stayed bridge and suspension bridge.

1. Beam bridge. The main beam is the main load-bearing member, and the stress is characterized by the main beam being bent. The main materials are reinforced concrete and prestressed concrete, which are mostly used for small and medium span bridges. The reasonable maximum span of a simply supported beam bridge is about 20 meters. The maximum span of a cantilever beam bridge and a continuous beam bridge is about 60-70 meters.

2. Arch bridge. The arch rib is the main load-bearing member, and the force is characterized by the bearing pressure of the arch rib and the level thrust of the support. The main materials are completed, reinforced concrete, and the scope of application depends on the material. The span spans from tens of meters to more than 300 meters. At present, the largest span reinforced concrete arch bridge in China is 170 meters.

3. Just bridge. It is a kind of bridge with the bridge span structure and the tonnage structure as a whole. The pillar and the main beam are subjected to the same force. The force is characterized by the rigid connection between the pillar and the main beam, and the negative bending moment is generated at the end of the main beam, which reduces the cross section. The bending moment, while the support not only provides vertical force but also bending moment. The main material is reinforced concrete, suitable for small and medium spans, such as overpasses, viaducts, etc.

4. Cable-stayed bridge. Beams, cables and towers are the main load-bearing members. Several cable stays on the tower are used to increase the elastic support in the beam span, which reduces the bending moment inside the beam and increases the span. The force is characterized by the external load passing from the beam to the cable and then to the tower. The main materials are prestressed steel cables, concrete and steel. Suitable for medium or large bridges.

5. Suspension bridge. The main cable is the main load-bearing member, and the force is characterized by the external load transmitted from the beam to the main cable through the tie rod, and then to the anchor rod at both ends. The main materials are prestressed steel cables, concrete and steel, suitable for large and super large bridges.

Our bridge internship lasted for two days. On July 12th and 13th, we set off at 8:00 every morning and returned to school at noon. In the afternoon, do the corresponding summary in the bedroom. The following is the detailed content:

On July 15th, at 8:00 am, we gathered in front of the school's cinema and collectively drove to visit the bridge over the xx river. Our first stop is the xx River Bridge across the xx River and the xx River. It consists of xx Hexi Approach Bridge, xx River Bridge, Viaduct, xx River Bridge and XX River Bridge East Approach Bridge from west to east. It is a typical representative of the combination of beam bridge and arch bridge. Among them, the xx river bridge and the xx river bridge are water bridges, and the remaining three are dry bridges. The xx River Bridge is a typical down-contracted arch bridge. The approach bridge is a prestressed three-span continuous box girder. The total length of the bridge is 170 meters. The main bridge is 140 meters long, the arch length is 75.8 meters, and the bridge width is 32 meters. The xx River Bridge is 281 meters long and the bridge deck is 29 meters wide. Under the leadership of the teacher, we first visited the piers of the approach bridge and the main bridge, analyzed the composition of the interior of the bridge deck, and recognized the characteristics of the arch bridge. Then we walked through the xx river and the xx river from the bridge. After feeling the unique design of the giant arch, we rushed to the next stop: the xx bridge. Standing on the observation deck, we quietly watched this veritable "world's first span." The xxxx bridge ranks first in the world in both the span and the height of the inclined tower. The main bridge structure is a cable-stayed bridge with no back cable leaning tower. The main span is 206 meters. There is no bridge pier under the bridge. The tower body and the bridge deck are completely inclined by 13 pairs of harp-type parallel wires. The cable-stayed bridge tower adopts a thin-walled hollow reinforced concrete structure with equal section. The tower base is consolidated with the foundation, and the main beam is also a steel box beam.... Listening to the teacher’s slightly proud words, we also have to sigh the courage of xx people. creativity. The first day of the visit ended with a burst of sighs from the students.

On July 16th, at 8:00 am, the same team, the same we set off again, this time to experience the xx bridge. The car stopped at the side of a giant suspension bridge, which is the xx bridge on xx. It is the first in Asia, the world's second self-anchored suspension bridge - XX Bridge is 845 meters long by the concrete of the approach bridge, the main span is 328 meters long, the main bridge is 732 meters long, and the bridge width is 29 meters, of which the motor vehicle lane It is 23 meters wide and the non-motor vehicle lanes on both sides are 3 meters wide. The total length of the bridge is 1577 meters and the total height is 124.3 meters. It is the highest bridge on xx. In accordance with the usual way of visiting from bottom to top, we fully appreciate the grandeur of the bridge under the guidance of the teacher, and also sighed the difficulty of the project, which cost a lot. Walking on the carved bridge surface, come in the breeze of xx, look at the main line of the beautiful curve of the straight line of the tie rod, listen to the teacher to explain the self-anchoring magical effect, there is a feeling that is I also have to work hard to design such a bridge! After getting on the train again, we came to the last bridge to visit xx North Bridge. It is 3,616 meters long and 25 meters wide and is divided into 4 lanes. It was officially opened to traffic on January 30, 1991. Has a considerable history. However, at that time, because it was the hub connecting China's east, west, south and north national highways, the technology adopted was quite advanced. The bridge has a total of 159 bridge piers, and thousands of tons of vessels can be smoothly navigated under the bridge. The main bridge spanning xx consists of a double tower single cable plane prestressed concrete cable-stayed bridge and two sides are continuous beams, with a total length of 1025.26m. The total length of the cross-strait approach bridge is 1336.68m. The width of the main bridge is 25m, and the main beam of the cable-stayed bridge is a three-chamber closed box girder. Full-section one-time monolithic suspension construction. The pylon adopts inverted y-type single-column structure. The upper anchor section of the tower column is h-shaped section with a height of 31.3m. The lower tower leg has a rectangular section with a height of 22.42m. The two legs and the double-walled tower pier are rigidly connected through the beam. The tower pier foundation uses 14 φ2m bored piles and is constructed with double-walled steel cofferdams. It can be seen that the designer's grasp of the details at that time is in place. Seeing the bridge of the vicissitudes of life, the teacher said that its life span is one hundred years. When we sigh, it is hard to imagine that things at that time are human. With a trace of reluctance, we embarked on the way back, waved a goodbye, and the sky was still a cloud.

Internship summary:

University life is a day of intense and full of expectation. When you are studying leisurely, you always carry your bags, stay away from family, friends, and teachers, and go to the road of your own. However, when we finally can leave the nests of the elders like the eagle feathers that have just been feathered, and walk alone on the big stage of social work, we find that the road to life is so rough and bumpy, anyone’s success is It was a storm.

In the short two-day internship, I learned a lot of things. The original kind of heart is not proud of it. Instead, I am working hard to study on the ground. When I set my own mentality, from the passive state of social work to the active state of adapting to society, with a relaxed mood and plenty of energy to return to the intense study work, I suddenly felt this way. In just two days, it seems that the thought has been sublimated again, and there is another sentiment in life.

This internship made me realize that reading is a way to broaden my horizons of knowledge, but more practice, smooth in the real world, touch the pulse of society, set a position for myself, is also a perfect way to improve their comprehensive quality. s Choice.

This internship made me jump out of the ivory tower, came to the construction site for an internship, and learned practical knowledge in the big university. This is also the first time I have really contacted the society and felt the society.

Finally, I would like to thank the team leader who participated in this internship. Thank you for accompanying us. Sincerely, you have worked hard, thank you!

Part 2: Bridge Engineering Internship Report

First, the purpose of the internship:

Through the on-the-spot internship of the Annan Expressway, I have a comprehensive understanding of the construction of the asphalt pavement of the expressway, the design of the road and the design and layout of other highway-related facilities, and deepened our knowledge of the course. The understanding makes learning and practice a combination.

Second, internship time:

May 5th to October 10th, XX

Third, the internship location:

Annan Expressway oil surface two standard one work area.

High-speed overview: Annan Expressway is a key highway construction project planned by Henan Province. The starting point is located in Daguanzhuang, southeast of Anyang City, connecting with the highway from Anyang to Linzhou, intersecting with Beijing-Zhuhai Expressway, and ending at Qingshitun, Nanle County. In the north of the village, it is connected to the Fuyang section of the A-Shenzhen Expressway. The Annan Expressway has a total length of 64.8 kilometers, two-way four-lane, and a designed driving speed of 120 km/h. The total estimated investment of the project is 1.79 billion yuan. Annan Expressway is an important part of the connecting of the east and west expressways of Shanxi, Henan and Shandong. Its construction will effectively alleviate the shortage of traffic in the east-west direction of northern Henan, further improve the network skeleton of Yubei Road and construct the northern Henan area. Sexual central cities will enhance the competitiveness of the northern Henan region and neighboring provincial cities.

Fourth, the internship content:

1. Practice the mixing process of asphalt mixture

Mixing and transportation

There are two types of stationary mixing equipment for mixing the mixture in the factory, both batch and continuous. The former measures the weight of various materials of the mixture during each mixing, while the latter is continuously fed into the mixer after metering various materials. The mixing station uses the German Amman 4000 batch mixer.

Before mixing the asphalt mixture, the test mixture should be tested according to the determined mixing ratio. The various minerals and asphalt used should be strictly measured during the trial mixing. Through the trial mixing and sampling test to determine the mix ratio of each hot mix and its total weight, or the opening of various mineral feed inlets and the speed of asphalt and mineral feed, the appropriate amount of asphalt, mixing time, minerals and asphalt Heating temperature, and the temperature at which the asphalt mixture leaves the factory. After testing the tested asphalt mixture, the mixing ratio of the construction can be selected.

The transport vehicle uses a 30t large and medium-sized dump truck;

a. The transportation vehicle is equipped with thermal insulation and dustproof devices such as quilts and quilts to prevent the finished products from being polluted by dust during transportation;

b. The four corners of the transport vehicle's slot are tightly sealed to prevent the asphalt in the hot-melt state during the transportation of the finished product from causing pollution to the surrounding environment due to dripping;

c. After each floor is paved, carry out traffic control. In case of high wind or dust pollution, pay attention to cleaning before the construction of the lower layer;

d. When cross-construction with the first-phase project, coordinate the road traffic. If it is necessary to pass, we must pass the cleaning of the vehicle with the consent of our party, but the heavy machinery such as the excavator is strictly prohibited.

Paving

The paving process is as follows:

a grassroots preparation and stakeout

Before the surface layer is paved, the base layer and the roadbed should be inspected to ensure that the base layer and the surface layer of the road are well bonded and the water is immersed in the base layer. In order to control the paving thickness of the mixture, the measurement stakeout is performed after the base layer is prepared, and the sample pile is set along the centerline of the pavement and the width of the quarter road to mark the looseness of the mixture. When paving with an automatic leveling paver, the control baseline that guides the running direction of the paver and the elevation should also be released. The test section shall be paved before the construction of the expressway and the primary road. The length of the test section shall be determined according to the purpose of the test and shall be 100 to 200 m. The test section should be laid on a straight section. If paved on other roads, the conditions of the pavement structure should be the same, and the test of each structural layer of the pavement can be arranged on different test sections.

b paving

Asphalt mixes can be paved manually or mechanically, and high-grade road asphalt pavements should be mechanically paved. Asphalt mix pavers are available in both crawler and tire versions. The construction and technical performance of the two are roughly the same. This project uses the dt1600 large width and anti-separation paver produced by Shanxi Zhongda Machinery Group. The main components of the asphalt paver are the hopper, chain conveyor, spiral spreader, vibrating plate, spread plate, exercise part and engine.

c rolling

The compaction of petroleum asphalt mixture is carried out in three stages: initial pressure, double pressure and final pressure. It is proposed to adopt the following mechanical combination: combination i: initial pressure: double pressure roller compactor initial pressure; recompression: rubber roller compactor static pressure 2 Once, the double drum compactor re-vibrates 2 times; the final pressure: the double-roller roller static pressure 1 to 2 times. Combination ii: Initial pressure: double pressure roller double press initial pressure; recompression: double drum roller re-vibration 2 times, rubber roller compactor 2 times; final pressure: double drum roller static pressure 1~2 times

The modified asphalt compaction is carried out immediately after paving, and the waiting time of following the crushing and compacting to the rolling is performed, the initial pressure is not lower than 150 ° C, and the surface temperature after rolling is not lower than 90 ° C. The re-pressing is preferably carried out by roller compaction to increase the water tightness. The length of the roller compaction section of the road roller is determined by the principle of balance with the speed of the paver, and is kept substantially stable. The roller is advanced by the stepped shape of the paver each time the roller is folded back, so that the foldback is not in the same section. On the upper part, the section is marked by the flag method. During the continuous paving of the paver, the roller should not be stopped at random. The roller must not be turned, turned or parked on unrolled or uncooled sections, and the vibratory roller should be vibrated when it is worn on the formed road.

Seam construction

Various construction joints of asphalt pavements are often due to insufficient compaction, which are prone to problems such as steps, cracks, looseness, etc., affecting the flatness and durability of the pavement, and must be paid attention to during construction. In particular, the processing of the upper layer construction joints should be smooth and smooth, and try to avoid the phenomenon of jumping and affecting the flatness and driving comfort.

Drainage facility

The whole road surface is an arch type, so the general road surface adopts the slope to face the two sides and flows into the side ditch on both sides of the road; in the section of the road curve, the outer side of the road is super high, using single-sided drainage, and the central separation belt is set. There is a rainwater passage to collect rainwater from the road outside the curve, and then a horizontal drain pipe laid under the roadbed flows into the side ditch.

2. Learn to summarize asphalt quality assurance measures

During the mixing process of asphalt concrete, various aggregate heating temperatures and modified asphalt temperatures are strictly controlled in accordance with construction specifications and design requirements. The storage time of the mixed mixture shall not exceed 24h, and the temperature drop shall not exceed 10 °C during the period, and the phenomenon of aging of the binder, dripping and segregation of coarse aggregate particles shall not occur, otherwise it shall be treated as a material.

It is covered with thick canvas with rainproof function during the transportation of asphalt concrete. The paving of the modified asphalt concrete shall be continuous, uniform and uninterrupted paving, and the paving temperature shall be between 150 and 165 °C. The rolling is carried out immediately after paving: the initial pressure is not lower than 150 ° C, and the final pressure is not lower than 120 ° C. Due to its large viscosity, tire roller should not be used. All double-drive double-vibration roller compactors should be used. The overall pressure rolling policy is: high temperature, compact rolling, uniform and slow pressure; high frequency, low amplitude, first After the middle, the echelon advances, the vibratory roller must close the vibrating device when it is reversing.

V. Internship summary

Through this road internship in the field, we have a comprehensive understanding of the design and construction of the asphalt pavement of the expressway and honed the will, further understanding the knowledge in the classroom, and the theory has been obtained in the actual production. use. In recent years, China's highway industry, especially highways, has developed rapidly and its demand is increasing. This is both an opportunity and a challenge for workers engaged in roads. As students who are going out of school, they should master more professional knowledge and strengthen their practical and design skills in a limited time. This will be more conducive to future development and enable them to make a difference in this field.

Part 3: Bridge Engineering Internship Report

Understanding internship is an important teaching link in the civil engineering professional teaching plan. It is one of the important means and methods for students to connect theory with practice, grow practical knowledge, contact society and exercise themselves during their studies. The direction of our internship this time is the bridge project. Bridges are a common building in our daily life. There are several bridges on each river or river to allow people on both sides of the river or river to interact with each other without having to take a boat. Bridges are a very important building in our lives, so for a student studying civil engineering, there must be a deep understanding of the bridge.

I. Purpose of the internship

Under the premise of not having access to professional knowledge, there is a gap in our thoughts about the bridge. The teacher laughed and said that this is a "literacy". This internship is to give us some knowledge of the bridge and to have a certain understanding of the bridge. Let us have a preliminary understanding of the professional knowledge that may come into contact in the future, and enhance the enthusiasm of learning.

2. Internship time

July 16th to July 17th, 2019

III. Place of internship

People's East Road Guitang River Bridge

Liuyang River Bridge, Renmin East Road

Hongshan Bridge

Xiangjiang Sanchaji Bridge

Xiangjiang Second Bridge

4. Several bridges seen in the internship

People's East Road Guitang River Bridge

It is located at the intersection of Renmin East Road and Guitang River, near the entrance of Liuyang River in the lower reaches of the Guitang River. It is a key project on the east extension line of Renmin East Road. The bridge is 155 meters long and 29 meters wide. The approach bridge is a prestressed three-span continuous box girder. The main span is 78 meters long and is a down-type tie-bar arch. There is no horizontal connection between the two arch rings. The bridge type is unique in Changsha. Each arch circle has a length of 75.8 meters and a distance of 17.8 meters from the bridge deck. It is part of the People's East Road Bridge Project.

Liuyang River Bridge, Renmin East Road

It is located at the intersection of Renmin East Road and Liuyang River. The bridge is 281 meters long and 29 meters wide. It is a road bridge with two half-width bridges in the upper and lower reaches. It is also the largest span-continuous steel bridge in Changsha, forming a bridge. The unique landscape of the high cross two rivers. The biggest feature of the Liuyang River Bridge is that the two composite piers are like two thin pages, and the thin-walled pier is only 1.2 meters thick. This setting is rare in China. It is also part of the People's East Road Bridge project.

The People's East Road Bridge Project is a big project. It starts from West Street Garden in the west and reaches Beijing-Zhuhai Expressway in the east. It consists of Guitanghe West Approach Bridge, Guitang River Bridge, Viaduct, Liuyang River Bridge and Liuyanghe Bridge East Approach Bridge. It is called Liuyanghe Guitang River Bridge. . Among them, the Guitang River Bridge and the Liuyang River Bridge are water bridges, and the remaining three are dry bridges.

Hongshan Bridge

The Hongshan Bridge is known as the "world's first span." The bridge ranks first in the world in the span of the same type of bridge and the height of the leaning tower. Hongshan Temple Bridge is located 60 meters east of the old Hongshan Temple Bridge in the North Second Ring Road of Changsha. It is connected to the Sifangping Overpass in the south and the Hongshan Temple Tourist Resort in the north. The main bridge structure of the bridge is a cable-stayed bridge without a cable-stayed tower. The main span is 206 meters. There is no bridge pier under the bridge, which is 6 meters longer than the “second span” Spanish Alamillo Bridge. The vertical height of the pylon is 136.8m, the inclination angle of the tower is 58 degrees, the tower body and the bridge surface are completely inclined by 13 pairs of harp-type parallel steel wires, and the tower body adopts a thin-walled hollow reinforced concrete structure with equal section, which is consolidated by the tower foundation and the foundation. The main beam adopts steel-mixed structure, the steel box beam is 4.4 meters high and the bridge surface is 33.2 meters wide. The bridge has a novel structure and unique concept, reflecting the perfect unity of structure and architectural art.

Xiangjiang Sanchaji Bridge

Sanchaji Bridge starts from Sanyoshi Industrial Zone in Hexi New Town in the west and connects to Xiaxia Development Zone in the east. It has a total length of 1577 meters, a bridge deck width of 29 meters, two-way six lanes, and two non-motor vehicle lanes on each side are 3 meters wide. The main bridge of the Sanchaji Bridge uses self-anchored suspension bridges, including two sets of main piers and 17 sets of piers up to 100 meters. The main bridge deck of Sanchaji Bridge is a self-anchored steel box girder bridge with a length of 738 meters, of which the main span is 328 meters long. It ranks second in the world and first in Asia among similar bridges. The two sides of the main bridge of Sanyiji Bridge are prestressed concrete continuous girder bridge decks.

Xiangjiang Second Bridge

It is a "double tower single cable surface prestressed concrete cable-stayed bridge", located in the north of Changsha City, from Wujialing in the east to Yinpenling in the west. The main bridge structure is a double-tower single cable-stayed cable-stayed bridge with a total length of 1931 meters and a bridge surface width of 25 meters, of which the motorway is 15 meters wide, the non-motor vehicle lanes on both sides are 3.5 meters each, and the sidewalks are each 1.5 meters. It is reported that the bridge was built at the beginning of China's largest double-tower single cable-stayed cable-stayed bridge. Its unique place is that there are two towers, which are pulled on both sides of the tower by a cable stay, which is different from the Hongshan Bridge. The main material for this bridge is reinforced concrete, which is also different from Hongshan Bridge. The pier below the tower is not the same as the pier below the deck. This is mainly because the strength is different, and the force under the tower should be larger, so the pier below the tower is thicker, and Two independent decks share the foundation.

V. Internship experience

The biggest gain of this internship is that I have met many different types of bridges. Through the online information and teacher guidance, I know that bridges can be divided into various types according to different natures, including:

According to the use of points: highway bridge, railroad dual-purpose bridge, pedestrian bridge, machine farming bridge, water bridge.

Divided into span size and multi-span total length: special bridge, bridge, middle bridge, small bridge, culvert. among them:

Super Bridge: The total length of the porous span is ≥500 meters, and the single hole span is ≥100 meters.

Bridge: total length of porous span ≥100 m, single hole span ≥40 m

Middle Bridge: 30 meters < total length of porous span <100 meters, 20 ≤ single hole span <40 meters

Small bridge: 8 meters ≤ porous span total length ≤ 300 meters, 5 < single hole span < 20 meters

Culvert: total length of porous span <8 meters, single hole span <5 meters

According to the position of the lane, it is divided into: upper bearing bridge, middle bearing bridge and lower bearing bridge.

According to the force bearing condition of the load-bearing members, it can be divided into: beam bridge, slab bridge, arch bridge, steel structure bridge, suspension bridge, combined system bridge.

According to the age of use, it can be divided into: permanent bridge, semi-permanent bridge, temporary bridge.

Divided into material types: wooden bridge, completed bridge, reinforced concrete bridge, prestressed bridge, steel bridge.

If we analyze the bridges we visited this time from the stress of the load-bearing members, they are: the Guitang River Bridge is a lower-supported arch bridge; and the Hongshan Bridge is a cable-stayed bridge without a back cable; the Xiangjiang Sanchaji Bridge is Anchored suspension bridge; Xiangjiang Second Bridge is a double tower single cable plane cable-stayed bridge.

Among the bridges I saw, what I found most creative was the Hongshan Bridge and the Xiangjiang Sanchaji Bridge. Hongshan Bridge is a cable-stayed bridge with no backstay leaning tower. Cable-stayed bridge refers to a kind of bridge that draws the bridge deck directly on the pylon with many cables. It is a structural system composed of a pressure-bearing tower, a tensioned cable and a curved beam. It can be seen as a multi-span elastic support continuous beam with a cable instead of a buttress. It can reduce the bending moment in the beam, reduce the building height, reduce the structural weight and save materials. The cable-stayed bridge is composed of a cable tower, a main beam and a stay cable. The main bearing of the bridge is not the vehicle above it, but the itself, the bridge deck we are looking at. The cable of the Hongshan Bridge is divergent, with cable towers and bridge decks at its two ends. The head on the bridge deck is called the anchor head. One of the more characteristic features of the Hongshan Bridge is that there is a damper near its anchor head, which is a device for damping. Its top is movable and diagonally mounted on the stay cable to form an oblique triangle, which prevents vibration from different directions. Most of the bridge's components and all of its beams are made of steel, and its entirety constitutes a steel structure. We are standing on the sidewalk of the bridge, and when the vehicle passes, we can feel the bridge vibrating.

For the Xiangjiang Sanchaji Bridge, it is a self-anchored suspension bridge. Suspension bridge, also known as suspension bridge, is a bridge that takes tension cables or chains as the main load-bearing members. The suspension bridge is composed of a suspension cable, a cable tower, an anchor bolt, a boom, and a bridge deck. The main load-bearing member of the suspension bridge is a suspension cable, which is mainly subjected to tensile force and is generally made of steel with high tensile strength. As soon as I stepped onto the bridge, I felt that the two towers in the middle were very majestic, which made me think that the design of the bridge was very good. The bridge is made up of two separate parts that share the foundation. Later, the Xiangjiang Second Bridge was also composed of two parts but did not share the foundation. The main force part of the bridge is its suspension cable. The thickness of the suspension cable is also different. The height is higher as it gets closer to the tower, but its thickness is finer. There is a device on the two parallel adjacent suspension cables for damping, because the suspension cable is too high, and when there is vibration, it will shake left and right if it is not shocked.

In the course of the internship, I also learned a lot of professional concepts, such as bridge piers, bridges, brackets, hat beams and so on. I also learned a lot about the knowledge that design should master. For example, the two sides of the cap beam should be higher than one point, so that it can play a shockproof role. The construction of a bridge is completed in sections, so the bridge is also composed of one section. There will be expansion joints between every two sections. There is a rubber bearing between the pier and the cap beam, which can withstand the heavy load above and can slide longitudinally. The sidewalks on both sides of the bridge are hollow, which I did not know before. In order to drain, there are drainage holes on both sides of the bridge deck, which can prevent the bridge area from affecting the service life of the bridge.

Expansion joints are an important part of the design of the bridge. The expansion joint is because the bridge span is large, and the joint is deformed to avoid the external influence of the bridge after the bridge is built. The expansion joint can effectively protect the bridge from strong vibration and cause great damage. At the same time, the railing in the middle of the expansion joint can also move left and right, which also protects the railing from damage during vibration. This is an essential part of bridge design.

VI. Problems and shortcomings after the internship

The process of understanding the internship is a process of learning, because we are still in a state of lack of understanding of professional knowledge. It is precisely because of this that our internship seems to be so difficult, there will be so many problems, we do not even know some of the most basic problems, such as bridge piers, bridges and so on. During the internship, we found a lot of problems. After the internship, I still have some problems. For example, how to accurately distinguish which type of bridge a bridge belongs to? If the pavement of a bridge is damaged, is it repaired or heavy? Which method is expensive to add a new bridge? How can I correctly construct a bridge? Which method is best?

VII. Internship summary

Understanding the internship bridge project has taught me a lot about bridges, which is very meaningful for learning professional knowledge in the future. It not only allows us to master some professional concepts and terminology, but also increases our confidence in learning expertise in the future. Through the guidance of the teacher and the Internet to find information, we also have a certain understanding of the bridge, have a certain understanding of the bridge culture of our country, and also know some bridge design skills. This will be of great help to us in learning knowledge or designing bridges in the future. Although the sun is very big, I really feel that these two days have been very fulfilling, and I am grateful for the guidance of the teacher. I think I should try my best to learn my professional knowledge in the future, and I will try to design a creative bridge in the future.