An integrated transportation and erection construction method for prefabricated bridges

Abstract

The present invention belongs to the technical field of road transportation, and particularly relates to an integrated transportation and erection construction method for prefabricated bridges. By reasonably planning the construction processes within a fixed time period, using the completed bridge structure as a transportation channel, enabling the gantry crane and the pier erection machine to cooperate with each other, the time for erecting the main body of the pier and for connecting the main body of the pier to the bottom bearing platform is simultaneously used to transport the main body of the precast box girder and to implement the process of erecting the main body of the box girder. The night time is used for the equal-strength process of the cast-in-place concrete between the main body of the pier and the bearing platform, ensuring the initial conditions for the next erection cycle. Each cycle is gradually iterated, and finally the integrated transportation and erection construction of the overall prefabricated bridge is completed. The present invention cleverly avoids the problem in the prior art that the cast-in-place concrete cannot bear weight during the equal-strength process, which prolongs the construction duration of each span of the prefabricated bridge, and further prolongs the integrated erection construction period of the overall bridge, increasing the construction cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of road transportation, and particularly relates to an integrated transportation and erection construction method for prefabricated bridges. Background Art

[0002] With the progress of technology and the development of the national economy, the standardization and industrialization of building structures are getting higher and higher. The demand for low energy consumption, high efficiency, and high quality in the process of bridge construction is increasing, and at the same time, the environmental protection requirements for construction have also been greatly improved.

[0003] In recent years, with the continuous development of materials science and the progress of bridge design technology, bridge structures have been developing towards the direction of light weight, high strength, and rapid construction. At present, most of the superstructures of railway bridges and highway bridges in China can be prefabricated and erected, and relatively complete relevant specifications and national standards are available, and their production scale has initially formed an industrialization; however, the prefabrication and erection of substructures are still in the initial experimental stage. Especially for railway bridges, there are relatively few cases of using prefabricated erection.

[0004] Currently, the most commonly used prefabricated construction method is mainly transportation on existing roads or access roads and hoisting with crawler cranes. This method has high requirements for transportation conditions and hoisting sites, which restricts the development of prefabrication to a certain extent.

[0005] In the prior art, the prefabricated bridge construction method has the advantages of realizing the integrated transportation and erection of bridge piers and abutments, wide applicable terrain, high economic benefits, and high efficiency. The integrated transportation and erection method can use the completed main line bridge as a transportation channel to transport piers and girders, and complete the erection of the bridge through the coordinated action of pier erection machines and girder erection machines. This method has low requirements for erection sites and has great advantages in areas with few control points for girder erection progress, high environmental protection requirements, and large terrain undulations.

[0006] Currently, the construction of prefabricated bridge piers mostly involves off-line transportation and hoisting construction, which requires strengthening the bearing capacity of construction access roads and has strict requirements for the size, weight, and transportation conditions of pier components. However, due to the disadvantages of slow construction operation and long construction period in on-line construction, it has not been widely applied. Summary of the Invention

[0007] The purpose of the present invention is to overcome the technical defects of high site requirements, long construction period, and high cost existing in the existing bridge erection construction plan in the prior art, and provide an integrated transportation and erection construction method for prefabricated bridges.

[0008] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0009] An integrated transportation and erection construction method for prefabricated bridges, comprising the following construction steps:

[0010] Step 1: Install a pier erecting machine and a girder erecting machine at the pier and girder position of the completed initial segment. The pier erecting machine is located at the front end of the girder erecting machine, and the two are structurally separated and connected to each other in terms of processes.

[0011] Step 2: Transport the next pier column and transfer it to the position where the next pier column is to be erected through the pier erecting machine. Then, carry out the connection construction between the next pier column and the corresponding bearing platform. The connection construction includes the construction of cast-in-place concrete. After the cast-in-place concrete is poured, the pier enters the waiting state for the connection strength to increase (strength equalization) until the bearing capacity is met.

[0012] Step 3: The pier erecting machine moves forward by one span through the holes. The pier erecting machine moves forward between the bearing platforms at the lower part of the pier main body through the legs; the girder erecting machine then moves forward by one span through the holes, and then installs the next box girder main body, and the next box girder main body is located behind the next pier main body.

[0013] Step 4: Repeat Step 2 - Step 3 until the bridge erection is completed. The cycle period of Step 2 - Step 3 is one span per day.

[0014] In the technical solution of the present invention, by reasonably planning the construction process in a fixed time period and using the completed bridge structure as a transportation channel, the girder erecting machine and the pier erecting machine cooperate with each other. The time for erecting the pier main body and the connection construction between the pier main body and the bottom bearing platform is used to transport the precast box girder main body at the same time, and the process of installing the box girder main body is implemented. The time for the cast-in-place concrete strength equalization between the pier main body and the bearing platform is carried out at night, which guarantees the initial conditions for the next span erection cycle. Each cycle is gradually iterated, and finally the integrated construction of the transportation and erection of the overall prefabricated bridge is completed. The present invention cleverly avoids the problem in the prior art that the cast-in-place concrete cannot bear weight during the strength equalization process, which prolongs the construction time for each span advancement of the prefabricated bridge, and further prolongs the integrated erection construction period of the overall bridge, increasing the construction cost.

[0015] Preferably, the construction method includes three independent types of work. The first type of work is responsible for transporting the next pier column and the next box girder; the second type of work is responsible for the pier erecting machine passing through the holes, installing the pier column, and the connection construction between the pier column and the corresponding bearing platform; the third type of work is responsible for the girder erecting machine passing through the holes and the installation construction of the box girder. The work among these three types of work is independent of each other, that is, within the same time period, the three types of work can carry out their respective construction tasks separately.

[0016] Preferably, the three types of work carry out their respective construction tasks within the same weekly time period. Among them, the first type of work needs to cooperate with the second type of work to complete the positioning of the next pier column before the start of construction every day; the second type of work needs to cooperate with the third type of work to ensure that the strength equalization time of the pier column about to bear force is not less than 20h before the girder erecting machine passes through the holes.

[0017] Preferably, the pier includes a pier column and a bearing platform disposed below the pier column. After the pier column and the corresponding bearing platform are assembled, connection construction is carried out, and the connection construction specifically involves pouring and fixing concrete at the connection position between the pier column and the bearing platform.

[0018] In Step 1, the completed initial segment pier and beam serve as the starting point for the integrated transportation and erection construction. Specifically, the initial segment pier and beam include four completed piers and two completed box girders. The four piers are spaced apart to form three bridge spans, and the two box girders are respectively disposed in the initial first bridge span and the second bridge span along the construction direction of the bridge.

[0019] More preferably, the erection of the initial segment pier and beam can be completed by any method such as off-line transportation and erection or in-situ casting.

[0020] Preferably, the pier erection machine includes two guide beams, two groups of robotic arms, and three piers. The robotic arms and the piers can slide freely along the guide beams, and the piers are supported on the already constructed bearing platforms;

[0021] The guide beams span two spans. Among them, the guide beams are respectively guide beam a and guide beam b. The initial state of guide beam a is adjacent to the second bridge span; that is, guide beam a corresponds to the third bridge span, and guide beam b corresponds to the fourth bridge span;

[0022] The three piers successively include a first pier, a second pier, and a third pier along the bridge advancing direction. The first pier is supported on the bearing platform corresponding to the (N - 2)th pier column; the second pier is supported on the bearing platform corresponding to the (N - 1)th pier column, and the third pier is supported on the bearing platform corresponding to the Nth pier column; where N is the next pier main body; between the first pier and the second pier is guide beam a, and between the second pier and the third pier is guide beam b. The Nth pier column is located at the right end position of guide beam b.

[0023] Specifically, during the process of erecting the pier, the two groups of robotic arms are respectively connected end to end with the precast pier. The precast pier component slides horizontally forward. Then, before erection, the steel cable connecting the bottom of the pier is elongated, and the top of the pier remains stationary, so that the pier can be vertically rotated by 90 degrees, and the bottom of the pier is placed on the ground. Then, the connecting steel cable is loosened, and the steel cable connecting the top of the pier is shortened, and the pier body is gradually made vertical, and then the pier main body is longitudinally moved to the installation position.

[0024] Specifically, the process of erecting the pier is to connect the embedded longitudinal steel bars of the pier body and the bearing platform, then bind the peripheral stirrups, formwork, and finally pour the concrete of the connection section. During the process, temporary robotic arms can be used for support.

[0025] Preferably, the girder erecting machine includes two main girders and two legs arranged at intervals along the length direction of the main girders. Two overhead cranes are further arranged on the top surface of the main girders; the overhead cranes are used for transporting and transferring the box girders.

[0026] The main girders are respectively main girder a and main girder b. The main girder a corresponds to the position of the first bridge span, and the main girder b corresponds to the position of the second bridge span. The legs at the ends of the girder erecting machine are respectively the first leg and the second leg. The second leg corresponds to the position of the N-2th pier. The pier is transmitted in sequence through the main girder a and the main girder b, and then transmitted to the position of the guide girder b through the guide girder a, and then the Nth pier is installed on the corresponding bearing platform.

[0027] Specifically, the two-hole main girders of the girder erecting machine are respectively arranged in one-to-one correspondence with the main girders of two erected bridges.

[0028] The two legs are successively the first leg and the second leg; the second leg is supported on the front pier of the construction span of the bridge erecting machine, that is, at the position of the main body of the N-2th pier, which is the front support point of the main girder of the bridge erecting machine. The first leg is the rear support point of the bridge erecting machine and is supported on the completed bridge surface of the bridge erecting machine.

[0029] Preferably, when the main girder b of the girder erecting machine advances to the position of the next bridge span, the second leg of the girder erecting machine is supported on the top of the N-1th pier, and the box girder is transmitted to the position of the next bridge span through the overhead crane arranged on the girder erecting machine for the installation of the Nth box girder.

[0030] Preferably, the Nth box girder is one bridge span behind the Nth pier. N represents the number of cyclic repetition units of the bridge. N is selected as a natural number not equal to zero. The construction volume per day is one pier and one box girder. During the construction process of the box girder on the same day, the pier supporting the second leg of the girder erecting machine is at the pier top position of the pier in the previous cyclic repetition unit. Among them, the equal-strength time of the concrete at the bottom of the piers in adjacent cyclic repetition units is not less than 20h.

[0031] Preferably, during the process of the bridge pier erecting machine passing through the hole forward, the support piers are all stressed on the corresponding bearing platforms. Without stressing the piers, sufficient time is left for the cast-in-place concrete between the piers and the bearing platforms to combine. During the process of the girder erecting machine passing through one span of the hole, the equal-strength time of the main body of the pier corresponding to the second leg meets the requirement of not less than 20h.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] In the integrated transportation and erection construction method of the prefabricated bridge of the present invention, by reasonably planning the construction procedures within a fixed time period, using the completed bridge structure as the transportation channel, enabling the gantry girder erecting machine and the pier erecting machine to cooperate with each other, the time for erecting the main body of the pier and connecting the main body of the pier with the bottom bearing platform is used to transport the main body of the precast box girder at the same time, and the process of erecting the main body of the box girder is implemented. The night time is used for the equal-strength process of the cast-in-place concrete between the main body of the pier and the bearing platform, ensuring the initial conditions for the next span erection cycle. Each cycle is gradually iterated, and finally the integrated transportation and erection construction of the overall prefabricated bridge is completed. The present invention cleverly avoids the situation in the prior art that the cast-in-place concrete cannot bear weight during the equal-strength process, which prolongs the construction duration of each span of the bridge, and further prolongs the integrated erection construction period of the overall bridge, increasing the construction cost.

[0034] In the integrated transportation and erection construction method of the prefabricated bridge of the present invention, by reasonably arranging three types of workers, each type of worker independently completes the corresponding operation in terms of time. At the same time, through mutual cooperation, the initial construction conditions for other types of workers are created, so that the construction process of one span can be advanced every day under certain regular working conditions among the three types of workers, greatly shortening the total construction duration. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is the initial state diagram of the integrated transportation and erection construction method of the prefabricated bridge;

[0036] Figure 2 is the diagram of step-by-step construction;

[0037] Figure 3 It is the Gantt chart of the construction process;

[0038] Figure 4 It is the Gantt chart of the sequential process of the construction procedure;

[0039] Markings in the figure: 1 - the first bridge span, 2 - the second bridge span, 3 - the third bridge span, 4 - the fourth bridge span, 5 - the (N - 2)th pier, 6 - the (N - 1)th pier, 7 - the Nth pier, 8 - the Nth box girder,

[0040] 1a - the first box girder, 1b - the second box girder,

[0041] 10 - the pier erecting machine, 101 - guide beam a, 102 - guide beam b, 103 - the first pier, 104 - the second pier, 105 - the third pier,

[0042] 20 - the gantry girder erecting machine, 201 - main beam a, 202 - main beam b, 203 - the first leg, 204 - the second leg,

[0043] 30 - the bearing platform. DETAILED DESCRIPTION OF THE INVENTION

[0044] The present invention will be further described in detail below in combination with test examples and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter of the present invention is limited to the following embodiments, and all technologies implemented based on the content of the present invention belong to the scope of the present invention.

[0045] Embodiment 1

[0046] This embodiment details a construction method for the integrated transportation and erection of a prefabricated bridge. As shown in Figures 1-4 , the specific construction steps are as follows:

[0047] Step 1: Install the pier erection machine 10 and the beam erection machine 20 at the positions of the pier and beam of the initial segment that have been completed respectively. The pier erection machine 10 is located at the front end of the beam erection machine 20, and the two are connected to each other in position.

[0048] Specifically, the initial segment pier and beam include four piers that have been constructed and two box girders that have been constructed. As shown in Figure 1 , the four piers are arranged at intervals to form 3 bridge spans, and the two box girders (the first box girder 1a and the second box girder 1b) are respectively arranged in the initial first bridge span 1 and the second bridge span 2 along the construction direction of the bridge. In order to better describe the process of this construction method in the following, in the construction process of the first cycle, the pier to be constructed is the Nth pier 7 and the Nth box girder 8. Here, in the Nth pier 7 and the Nth box girder 8, (N = 1); and the Nth box girder 8 is located in the third bridge span 3, and the Nth pier 7 is located on the right side of the fourth bridge span 4.

[0049] Specifically, the pier erection machine 10 includes two guide beams, two groups of robotic arms and three piers. The robotic arms and the piers can slide freely along the guide beams, and the piers are supported on the already constructed caisson 30.

[0050] The guide beam passes through two spans. As shown in Figure 2a , where the guide beams are the guide beam a101 and the guide beam b102 respectively. The initial state of the guide beam a101 is adjacent to the second bridge span (that is, the guide beam a101 is located in the third bridge span 3 position); the guide beam b102 is adjacent to the guide beam a101 (that is, the guide beam b102 is located in the fourth bridge span 4 position).

[0051] The three piers successively include a first pier 103, a second pier 104, and a third pier 105 along the bridge advancing direction. The first pier 103 is supported on the bearing platform 30 corresponding to the (N - 2)th pier column; the second pier 104 is supported on the bearing platform 30 corresponding to the (N - 1)th pier column; the third pier 105 is supported on the bearing platform 30 corresponding to the Nth pier column, where the Nth pier column is the next pier column; between the first pier 103 and the second pier 104 is a guide beam a101, and between the second pier 104 and the third pier 105 is a guide beam b102.

[0052] The girder erecting machine 20 includes two main girders and two legs arranged at intervals along the length direction of the main girders. Two overhead cranes are also arranged on the top surface of the main girders.

[0053] The main girders are respectively a main girder a201 and a main girder b202. The main girder a201 corresponds to the position of the first bridge span 1, and the main girder b202 corresponds to the position of the second bridge span 2. The legs at the ends of the girder erecting machine 20 are respectively a first leg 203 and a second leg 204. The second leg 204 corresponds to the position of the (N - 2)th pier column. The pier column is successively conveyed through the main girder a201 and the main girder b202, and is conveyed to the position of the guide beam b102 through the guide beam a101, and then the Nth pier column is installed on the corresponding bearing platform 30. The state after installation is shown in Figure 2b ;

[0054] Step 2: Transport the next pier column (the Nth pier column 7) through the bridge deck of the initially constructed pier - beam of the initial segment, and erect the next pier column through the pier erecting machine 10 following the initially constructed pier - beam of the initial segment. Then, carry out the connection construction between the next pier column and the corresponding bearing platform 30. The connection construction includes binding the pier column steel bars between the pier column and the bearing platform and pouring concrete on the side wall at the bottom of the pier column. After the concrete pouring is completed, the pier enters the equal - strength state.

[0055] Specifically, during the pier erection process, two sets of robotic arms are respectively connected to the head and tail of the precast pier component. The precast pier component slides horizontally forward. Then, before erection, the steel cable connecting the bottom of the pier column is elongated, and the top of the pier remains stationary, so that the pier can be vertically rotated by 90 degrees, and the bottom of the pier is placed on the ground. Then, the connecting steel cable is loosened, the steel cable connecting the top of the pier is shortened, and the pier body is gradually made vertical. Then, the main body of the pier is longitudinally moved to the installation position.

[0056] Step 3: The pier erecting machine 10 advances through one span. The pier erecting machine 10 moves forward between the bearing platforms under the main body of the pier through the legs; as Figure 2c shown, during this period, the girder transport vehicle conveys the box girder to the waiting position for installation through the bridge deck. After the pier erecting machine 10 completes the span - passing, the girder erecting machine 20 also advances through one span, as Figure 2dAs shown in the figure, the installation of the next box girder body is then carried out, and the next box girder body is located at the rear side of the next pier body; when the main beam b202 of the girder erecting machine 20 advances to the next bridge span position, the second leg 204 of the girder erecting machine 20 is supported on the top of the (N - 1)th pier column, and the next box girder is conveyed to the next bridge span position by the overhead crane arranged on the girder erecting machine 20 for the installation of the Nth box girder 8, and the Nth box girder 8 is one bridge span behind the Nth pier column 7. That is, a construction cycle process is completed, as Figure 2e .

[0057] Step 4: Repeat Step 2 - Step 3 until the bridge erection is completed.

[0058] Specifically, the integrated prefabricated bridge integrated transportation and erection construction method includes three types of work. The first type of work is responsible for transporting the pier columns and box girders from the box girder factory (or pier column factory) to the initial section pier and girder position for standby; among them, the transportation of the box girder and the transportation of the pier column are carried out in sequence. Within 8 hours of working time, the transmission of one box girder and one pier column can be completed in sequence.

[0059] The second type of work is responsible for the transmission of the pier column from the pier erecting machine - the connection of the pier column and the corresponding bearing platform (grouting) - the concrete pouring between the pier column and the bearing platform; the reserved time for this process is 8 - 9 hours.

[0060] The third type of work is responsible for the pier erecting machine and the girder erecting machine to pass through the holes in sequence and the erection of the box girder.

[0061] Within the same time period, the three types of work can respectively carry out the corresponding construction operations simultaneously. Ensure that within one cycle period, the construction process of advancing one bridge span of the bridge can be completed, and ensure that the initial conditions of the next bridge span meet the conditions for continuous construction.

[0062] In this construction process, the construction processes of the three types of work are sequential and concurrent processes in terms of time.

[0063] In order to more clearly display the construction process of each cyclic bridge span of the prefabricated bridge, a time interval is introduced and described with 1 day (24 hours) as the cyclic interval. The construction descriptions of the time lines of the three types of work are carried out respectively.

[0064] Combined with Figure 3 Understand this solution:

[0065] First, define 8 o'clock every day as the initial construction state. Among them, the initial construction state process of the second type of work is in the state where the next pier column has been in place, that is, the construction personnel of the second type of work carry out the construction process of Step 2. This process starts from the transmission of the pier column through the bridge deck and continues uninterruptedly until the pier installation is completed and enters the equal-strength state, lasting for a total of 9 hours; that is, it ends at 5 pm.

[0066] The construction personnel of the first type of work carry out the construction independently of the second type of work. However, the initial construction conditions of the second type of work need to be unaffected. Since the construction process is to first install the pier columns in the construction section and then install the box girders, the construction personnel of the first type of work need to cooperate with the initial construction conditions of the second type of work and reasonably arrange the construction operations of the first type of work.

[0067] The construction personnel of the first type of work start to transport the box girders, transporting the box girders from the box girder factory to the vicinity of the bridge span to be installed for 4 hours, and then carry out the next cycle of transporting the pier columns, transporting the pier columns from the pier column factory to the vicinity of the bridge span to be installed for 4 hours, and the work ends.

[0068] The construction personnel of the third type of work need to complete the sequential jacking of the pier erection machine and the girder erection machine and the erection of the box girders. The third type of work needs to carry out the corresponding work in cooperation with the construction process of the second type of work. Among them, during the jacking process of the girder erection machine, the second leg 204 supports at the top of the next pier column. At this time, the next pier column starts to bear load, and the equal-strength time of the next pier column has reached 20 hours.

[0069] According to the equal-strength requirement of the concrete pouring of the pier columns, the present invention reasonably arranges each construction process, divides the work into different types and carries out synchronous construction, shortens the construction process of advancing one bridge span in each cycle to one day per cycle, and each cycle is gradually iterated to ensure the completion of the integrated construction process of the transportation and erection of the overall prefabricated bridge in the shortest time.

[0070] The above is only the preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. And the changes and alterations made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. An integrated transportation and erection construction method for prefabricated bridges, characterized in that, it includes the following construction steps: Step 1: Install a pier erection machine (10) and a girder erection machine (20) at the pier-girder positions of the completed initial segment respectively. The pier erection machine (10) is located at the front end of the girder erection machine (20), and the two are connected to each other in position. In Step 1, the initial segment pier-girder includes four completed piers and two completed box girders. The four piers are arranged at intervals to form 3 bridge spans, and the two box girders are respectively arranged in the initial first bridge span (1) and the second bridge span (2) along the construction direction of the bridge; The pier erection machine (10) includes two guide beams, two groups of robotic arms and three piers. The robotic arms and the piers can slide freely along the guide beams, and the piers are supported on the already constructed bearing platforms; The guide beams span two spans. The guide beams are respectively guide beam a (101) and guide beam b (102). The initial state of the guide beam a (101) is adjacent to the second bridge span (2); the guide beam b (102) is adjacent to the guide beam a (101); The three piers successively include a first pier (103), a second pier (104) and a third pier (105) along the bridge advancing direction. The first pier (103) is supported on the bearing platform corresponding to the (N-2)th pier column; the second pier (104) is supported on the bearing platform (30) corresponding to the (N-1)th pier column (6), and the third pier (105) is supported on the bearing platform corresponding to the Nth pier column (7); where the Nth pier column (7) corresponds to the next pier column; between the first pier (103) and the second pier (104) is the guide beam a (101), and between the second pier (104) and the third pier (105) is the guide beam b (102); The girder erection machine (20) includes two main girders and two legs arranged at intervals along the length direction of the main girders. Two hoisting overhead cranes are also arranged on the top surface of the main girders; The main girders are respectively main girder a (201) and main girder b (202). The main girder a (201) corresponds to the position of the first bridge span (1), and the main girder b (202) corresponds to the position of the second bridge span (2). The legs at the ends of the girder erection machine (20) are respectively the first leg and the second leg. The second leg corresponds to the position of the (N-2)th pier column. The pier column is successively transmitted through the main girder a and the main girder b, and is transmitted to the position of the guide beam b through the guide beam a, and then the Nth pier column is installed on the corresponding bearing platform; Step 2: Transport the next pier column and transmit it to the target position of the next pier column through the pier erection machine (10). Then, carry out the connection construction between the next pier column and the corresponding bearing platform (30). The connection construction includes the construction of cast-in-place concrete. After the cast-in-place concrete is poured, the pier enters the equal-strength state; Step 3: The pier erection machine (10) moves forward by one span. The pier erection machine (10) moves forward between the bearing platforms at the lower part of the pier main body through its legs; then the girder erection machine (20) moves forward by one span, and then installs the next box girder main body, which is located at the rear side of the next pier main body. Step 4: Repeat Step 2 - Step 3 until the bridge erection is completed. The cycle period of Step 2 - Step 3 is one span per day.

2. The integrated transportation and erection construction method for prefabricated bridges according to claim 1, characterized in that, the construction method includes three independent types of work. The first type of work is responsible for transporting the next pier column and the next box girder; the second type of work is responsible for the installation of the pier column and the connection construction between the pier column and the corresponding bearing platform; the third type of work is responsible for the span passing of the pier erection machine, the span passing of the girder erection machine, and the installation construction of the box girder.

3. The integrated transportation and erection construction method for prefabricated bridges according to claim 2, characterized in that, the three types of work respectively carry out their own construction tasks within the same weekly time period. Among them, the first type of work needs to cooperate with the second type of work to complete the positioning of the next pier column before the daily construction starting point; the second type of work needs to cooperate with the third type of work to ensure that the pier column about to bear force waits for a time not less than 20h for the strength to meet the bearing capacity before the girder erection machine passes through the span.

4. The integrated transportation and erection construction method for prefabricated bridges according to claim 1, characterized in that, the pier includes a pier column and a bearing platform (30) arranged below the pier column. After the pier column and the corresponding bearing platform (30) are assembled, connection construction is carried out. The connection construction is specifically to carry out concrete pouring and fixing at the connection position between the pier column and the bearing platform; after the concrete pouring is completed and the strength reaches 20 hours, the pier column can carry out load-bearing construction.

5. The integrated transportation and erection construction method for prefabricated bridges according to claim 1, characterized in that, when the main beam b (202) of the girder erection machine (20) advances to the position of the next bridge span, the second leg (204) of the girder erection machine (20) supports on the top of the (N - 1)th pier column (6), and the box girder is transmitted to the position of the next bridge span through the hoisting crane arranged on the girder erection machine (20) for the installation of the Nth box girder (8), and the Nth box girder (8) is shifted backward by one bridge span compared with the position of the Nth pier column (7).

6. The integrated transportation and erection construction method for prefabricated bridges according to claim 1, characterized in that, during the pier erection process, two groups of robotic arms are respectively connected end to end with the prefabricated pier components. The prefabricated pier components slide horizontally forward, and then before erection, the sling connecting the bottom of the pier column is elongated, and the top of the pier remains stationary, so that the pier can be rotated vertically by 90 degrees, the bottom of the pier is placed on the ground all the time, then the connecting sling is released, the sling connecting the top of the pier is shortened, and the pier body is gradually made vertical, and then the pier main body is longitudinally moved to the installation position.

7. The integrated transportation and erection construction method for prefabricated bridges according to claim 1, characterized in that, During the process of the pier erection machine (10) passing through the hole forward, the supporting piers are all supported on the corresponding caissons (30). During the process of the girder erection machine (20) passing through one span, the equal-strength time of the pier column body corresponding to the second leg (204) meets the construction requirement of not less than 20 hours.

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