CN111851307A - Construction method of large-span prefabricated corrugated web composite box girder transport frame - Google Patents

Abstract

A construction method for large-span prefabricated prefabricated corrugated web composite box girder transport frame, comprising the following steps: step 1, modularly combining a modular transport vehicle into a set of combined modular transport vehicles (1), the overall width of which is two pieces The width of the beam; Step 2, install the corrugated steel web composite box girder on the camel beam (2) of the combined modular transport vehicle (1); Step 3, transport the corrugated steel web composite box girder to the bridge erecting machine ( 4) at the rear of the beam feeding area; Step 4, use the bridge erecting machine (4) to erect the full beam body; Step 5, install the steel bars at the position of the diaphragm and the roof between the adjacent beam bodies, install the suspension formwork, and pour concrete. The method of the invention solves the problems of mechanical equipment transportation and whole hole erection of large-span prefabricated prefabricated corrugated web composite box beams, opens up a new way for the mechanized construction of prefabricated steel-concrete composite bridges, and promotes more economical large-span Application of prefabricated corrugated steel web beams.

Description

Construction method of large-span prefabricated corrugated web composite box girder transport frame

technical field

The invention relates to the technical field of prefabricated bridge construction, in particular to a large-span prefabricated prefabricated corrugated web composite box girder construction method.

Background technique

At present, domestic long-span corrugated steel web composite girder bridges are all suspension, cable-stayed and continuous rigid frame bridge types. The corrugated steel web composite beam bridge is the most economical beam type among prefabricated bridges with a span of 40-60m. Compared with the traditional beam bridge, it makes full use of the wrinkle effect of corrugated steel plates and the high compressive strength of concrete and corrugated steel. The high shear yield strength of the web plate effectively combines the three materials of steel, concrete and prestress, which can improve the efficiency of material use and reduce the project cost. However, the corrugated steel web composite girder bridges at home and abroad are mainly constructed by cast-in-place brackets, hanging basket cantilever casting or jacking. Most of the prefabricated corrugated steel web bridges that have been built are hoisted and erected by cranes. Therefore, how to realize prefabricated large-span corrugated steel web composite girder bridges for transportation and mechanized whole-hole erection to save resources and energy, reduce construction pollution, reduce project costs, and improve labor productivity and quality and safety is particularly urgent.

At present, there are few domestic descriptions about the construction method of large-span prefabricated corrugated beams. When erecting composite beams, first construct abutments or piers, set up temporary supports, and hoist two prefabricated corrugated steel sloping web edge beams to the support system in sections, connect steel bars, and pour longitudinal wet joints between the two edge beams And the roof flange plate, forming a composite beam of a wide box beam structure, forming an integral section. After the concrete wet joint to be poured reaches a certain strength value, the support is removed, the system conversion is completed, and the construction is ended. The disadvantage of this method is that there are many beam sections. In order to meet the erection requirements, temporary supports need to be erected on the site of each span bridge. After the beam sections are erected, the bottom plate and roof steel bars are bound on the support system, and then concrete is poured. This method The process is complex, the on-site workload is large, and the safety management is difficult, the quality control is difficult, the construction efficiency is low, and there are many restrictions on topography and hydrology, which cannot be implemented in bridges with unconditional temporary supports. And it does not explain the transportation method and the bridge frame installation.

SUMMARY OF THE INVENTION

In order to solve the above problems existing in the prior art, the present invention provides a large-span prefabricated and assembled corrugated web composite box girder construction method. The method of the invention solves the problems of mechanical equipment transportation and whole hole erection of large-span prefabricated prefabricated corrugated web composite box beams, opens up a new way for the mechanized construction of prefabricated steel-concrete composite bridges, and promotes more economical large-span Application of prefabricated corrugated steel web beams.

In order to achieve the above purpose, the present invention provides a large-span prefabricated construction method for the corrugated web composite box girder transport frame, comprising the following steps:

Step 1, modularly combining the modular transport vehicles, four modular transport vehicles are combined into a set of combined modular transport vehicles, and the overall width of the combined modular transport vehicles is the width of two beams;

Step 2, install the corrugated steel web composite box girder on the camel girder of the combined modular transport vehicle, and bundle it firmly;

In step 3, the combined module transport vehicle transports the corrugated steel web combined box girder to the rear beam feeding area of the bridge erecting machine by means of single-width walking;

Step 4: The bridge erection machine is used to erect the full-width beam body; the outriggers of the bridge erection machine do not need to be moved, and the whole-hole beam body is erected by moving the crane and the main truss;

The fifth step is to install the steel bars at the positions of the diaphragm and the roof between the adjacent beam bodies, install the suspension formwork, and pour concrete. Therefore, there is no need to erect brackets, the workload on site is small, and the bridge forming speed is fast.

Preferably, in the second step, the camel beam is welded by section steel to form a box shape, and is transported with the combined module.

The connecting part of the truck is the balance shaft. The camel beam can be properly rotated through the balance shaft within a certain range, and can adapt to the stability of the beam body during transportation under different longitudinal slope conditions.

Preferably in any of the above solutions, in the third step, the combined module transport vehicle walks on the two beams on which the beam body has been erected, and the running track of the tires is the beam rib position; the beam rib position of the box beam has a large bearing capacity , the structure is more secure.

In any of the above solutions, preferably, in the fourth step, the order of the beams is the inner side beam, the outer side beam, and the middle beam.

In any of the above solutions, preferably, in the fourth step, when the inner side beam is erected, the hoist is connected and hoisted by the crane and the beam body to complete the erection of the beam body.

In any of the above solutions, preferably, in the fourth step, when the outer side beams are erected, a temporary support is installed at the position of the middle beam, wherein the top surface of the temporary support is higher than the height of the designed block on the top of the pier. The spreader issued by the crane is connected and lifted with the beam body of the outer beam, and is temporarily stored at the middle beam.

In any of the above solutions, it is preferred that, in the fourth step, the crane and the beam bodies of the outer side beams are unlocked and returned to their positions, and the main trusses on the left and right sides of the bridge erecting machine are synchronously moved laterally, and the main trusses are temporarily stored until the main trusses are stored. When it stops just above the outer side beam, the main truss is installed with a suspension device to connect with the beam body of the outer side beam and lift; To the design height of the beam body, the beam body erection of the outer beam is completed.

Preferably in any of the above solutions, in the step 4, the erection of the middle beam is completed by the overhead crane; if a bridge with multiple middle beams needs to be erected, the overhead crane can be used to complete the erection of the middle beam first, and the last one The middle beam adjacent to the outer side beam is erected last. It solves the problem that when the side beam must be hoisted and erected by the crane, the lateral dimension of the bridge outrigger beam needs to be designed to be long enough, and the main truss has too much lateral movement, resulting in poor stability. This method improves the lateral load-bearing and anti-overturning ability of the bridge crane and ensures the safety.

The beneficial effects of the present invention are:

1. The present invention makes full use of the rapid combination characteristics of the modular vehicle, and after the combination, the bearing capacity is stronger, the stability is better, the total tire grounding area is large, and the requirements for the bearing capacity of the transportation channel are low. When the large-span prefabricated beam is transported, the balance shaft of the camel beam can be rotated within a certain range, which meets the transportation requirements under different longitudinal slope conditions. The whole hole of the beam body is transported to the bridge position by means of walking on the half-width beam, and the tire walking track is the position of the beam rib of the two beams, which has little influence on the bridge structure.

2. Most bridges do not have large-tonnage vehicle transportation conditions. The traditional erection of brackets and segmental hoisting by cranes have high requirements for the foundation of the bridge. The present invention adopts the method of transporting the beam on the beam without any requirement on the topography under the bridge position, and solves the transportation problem. In addition, the present invention makes full use of the way of the overhead crane and the main truss of the bridge erection machine to erect the whole-hole prefabricated beam, the outriggers do not need to be moved, the safety of the bridge machine is better, the erection efficiency can be improved, and at the same time, it can be used for similar small cantilever side beams. Bridge beam slab erection provides a new technical idea.

3. Conventional large-span prefabricated beams are hoisted in sections, and brackets need to be erected on site, and then the top and bottom plates of the beams are connected to form an overall structure. The on-site operation time is long, the workload is large, and there are many potential safety hazards. The invention adopts the whole hole erection, which can effectively speed up the construction progress and reduce the safety risk. It solves the technical problems in the construction of the whole hole frame of the long-span prefabricated corrugated steel web composite box girder, and provides a long-span prefabricated corrugated steel that is more suitable for crossing rivers, roads and bridges that are not suitable for large vehicles to pass through. Construction method of frame transport for web composite box girder.

4. The present invention can be applied to bridges and municipal projects without shipping conditions. During transportation, the corrugated steel web box girder is transported to the bridge position by means of beam-on-beam transportation to avoid damage to the existing erected beams. If it is damaged by force, the bridge erection machine is traversed to carry out full-width and whole-hole erection, which reduces the on-site workload and greatly improves the mechanized construction level of prefabricated corrugated steel web bridges.

5. The transportation and erection process implemented by the present invention adopts the method of using a combined modular truck to transport the beam on a single two-piece beam to transport the large-span corrugated steel web box girder to the rear of the bridge erecting machine, so as to avoid the girder truck in the When the beams are erected, the force is concentrated when walking, causing the quality of the bridge to be damaged. By utilizing the lateral movement of the main truss of the bridge erection machine and the hoisting function to solve the erection problem of the outer side beams of the whole hole, a new technology is opened up for the rapid erection of large-span prefabricated corrugated beams.

Description of drawings

1 is a cross-sectional view of a combined modular transport vehicle used in the large-span prefabricated corrugated web combined box girder transport frame construction method according to the present invention;

2 is a schematic diagram of the upper transport beam of the combined modular transport vehicle beam according to the large-span prefabricated prefabricated corrugated web combined box beam transport frame construction method of the present invention;

3 is a schematic diagram of the corrugated steel web box girder feeding beam according to the large-span prefabricated corrugated web composite box girder transport frame construction method of the present invention;

4 is a schematic diagram of hoisting a corrugated steel web box girder by a bridge erecting machine according to a large-span prefabricated prefabricated corrugated web composite box girder frame transport construction method of the present invention;

Fig. 5-1 is a schematic diagram showing that the outer side beams are temporarily stored in the middle beam position according to the large-span prefabricated prefabricated corrugated web composite box girder transport frame construction method of the present invention;

5-2 is a detailed view of the outer side beams temporarily stored in the middle beam position according to the large-span prefabricated prefabricated corrugated web composite box girder transport frame construction method of the present invention;

Figure 6-1 is a schematic diagram showing that the main truss of the bridge erecting machine is connected to the outer beam after the main truss of the bridge erecting machine is moved laterally according to the large-span prefabricated prefabricated corrugated web composite box girder construction method of the present invention;

6-2 is a detailed view of the connection structure with the outer beam after the main truss of the bridge erecting machine is moved laterally according to the large-span prefabricated prefabricated corrugated web composite box girder construction method of the present invention;

Figure 7-1 is a schematic diagram of the lateral beam installation of the main truss of the bridge erecting machine according to the large-span prefabricated prefabricated corrugated web composite box girder frame transport construction method of the present invention;

Figure 7-2 is a detailed view of the outer side beams using the main truss of the bridge erection machine to move laterally and drop the beams according to the large-span prefabricated prefabricated corrugated web composite box girder frame transport construction method of the present invention.

Among them, 1. Combined modular transport vehicle; 2. Camel beam; 3. Balance shaft; 4. Bridge erecting machine; 5. Crane; 6. Main girder; 7. Spreader; Block; 10. Suspension device.

Detailed ways

The technical solutions of the present application will be described in detail below with reference to the drawings and specific embodiments of the present application, but the following examples are only for understanding the present invention, and the examples in the present application and the features in the examples can be combined with each other , the application may be implemented in many different ways as defined and covered by the claims.

Taking a two-way six-lane Yellow River super bridge project as an example, the technical description is given. The north approach bridge and the south approach bridge in the embankment are all prefabricated corrugated steel web composite box girders, a total of 6 beams with a single hole, a single beam span of 50 meters, and a beam weight of 380 tons.

According to the actual situation of the project and the requirements of the construction period, the following problems are mainly solved in the construction: the span of prefabricated beams and slabs is large, the maximum longitudinal slope of the bridge is 2.65%, the bridge piers are all located in the Yellow River beach, the groundwater level is high, and the large-tonnage hoisting and transportation equipment cannot pass. . The single-piece corrugated steel web composite box girder has a length of 50 meters and a weight of 380 tons, so it is difficult to erect the whole hole.

The construction method of the large-span prefabricated prefabricated corrugated web composite box girder transport frame according to the present invention includes the following steps:

Step 1: First, modularize the modular transport vehicle, as shown in Figure 1.

The modular transporter has the function of quick combination. Four modular transporters are combined into a set of modular transporter 1 through hydraulic system and electronic control system. The projection of the modular transporter 1 is rectangular, and the overall length and width can be adjusted as Taking the project as an example, the total width is 8.5 meters, and it can walk across two beams at the same time. A camel beam 2 is installed on the top of the combined modular transport vehicle 1 for carrying and fixing the box beam.

In step 2, the corrugated steel web composite box girder is installed on the camel girder 2 of the combined modular transport vehicle 1 by using a girder lifter in the beam factory. The camel beam 2 is welded by section steel to form a box shape, and the connection part with the combined modular transport vehicle 1 is the balance shaft 3, which can be properly rotated within a certain range to adapt to the stability of the beam body during transportation under different longitudinal slope conditions. , as shown in Figure 1 and Figure 2.

The third step is to transport the beam on the beam. The combined modular transport vehicle 1 transports the corrugated steel web composite box girder to the rear beam feeding area of the bridge erecting machine 4 by using a single-width transport track. The combined modular transport vehicle 1 walks on the two beams on which the beam body has been erected, and the running track of the tires is the position of the beam rib to ensure the safety of the bridge structure, as shown in Figure 2.

In step 4, the bridge erection machine 4 is used to erect the full-width beam body.

The legs of the bridge erecting machine 4 do not need to be moved, and the whole-hole beam body is erected through the crane 5 and the main truss 6 . The order of frame beams is inner side beam, outer side beam, middle beam.

The erection of the inner side beam is shown in Figure 3 and Figure 4.

When erecting the inner side beam, the crane 5 sends a spreader 7 to connect and lift the beam body to complete the erection of the beam body. After the inner side beam is erected, it provides a safe passage for people to walk forward and backward. As shown in Figure 3 and Figure 4.

When the outer side beams are erected, a temporary support 8 is installed at the middle beam, wherein the top surface of the temporary support 8 is higher than the height of the designed block 9 at the top of the pier. The crane 5 sends a spreader 7 to connect and lift the beam body, and temporarily store it at the position of the middle beam. As shown in Figures 5-1 and 5-2.

The crane 5 and the beam are unlocked and returned to their positions, and the main trusses 6 on the left and right sides of the bridge erecting machine 4 move synchronously. When the main truss 6 moves to the top of the temporarily stored outer beam, it stops. The main truss 6 is installed and suspended. The device 10 is connected to the beam body and properly lifted, as shown in Figures 6-1 and 6-2.

The main truss 6 is moved laterally again, and stops when the main truss 6 is moved to the design position of the outer beam, and the suspension device 10 is lowered to the design height to complete the beam erection. As shown in Figures 7-1 and 7-2.

The middle beam is erected by the overhead crane 5. If a bridge with multiple beams needs to be erected, the overhead crane 5 can be used to complete the erection of the middle beam first, and the last middle beam adjacent to the outer side beam is erected last.

Step 5: Connect and install the steel bars at the position of the diaphragm between the adjacent beam bodies and the top plate, install the suspension formwork, and pour concrete.

The invention makes full use of the rapid combination feature of the modular vehicle, and after the combination, the bearing capacity is stronger, the stability is better, the total ground area of the tire is large, and the requirement for the bearing capacity of the transportation channel is low. When the large-span prefabricated beam is transported, the balance shaft of the camel beam can be rotated within a certain range, which meets the transportation requirements under different longitudinal slope conditions. The whole hole of the beam body is transported to the bridge position by means of walking on the half-width beam, and the tire walking track is the position of the beam rib of the two beams, which has little influence on the bridge structure.

The present invention adopts the method of transporting the beam on the beam without any requirement on the topography under the bridge position, and solves the transportation problem. In addition, the present invention makes full use of the way of the overhead crane and the main truss of the bridge erection machine to erect the whole-hole prefabricated beam, the outriggers do not need to be moved, the safety of the bridge machine is better, the erection efficiency can be improved, and at the same time, it can be used for similar small cantilever side beams. Bridge beam slab erection provides a new technical idea.

The invention adopts the whole hole erection, which can effectively speed up the construction progress and reduce the safety risk. It solves the technical problems in the construction of the whole hole frame of the long-span prefabricated corrugated steel web composite box girder, and provides a long-span prefabricated corrugated steel that is more suitable for crossing rivers, roads and bridges that are not suitable for large vehicles to pass through. Construction method of frame transport for web composite box girder.

The present invention can be applied to bridges and municipal engineering without shipping conditions, and the whole hole of the corrugated steel web box girder is transported to the bridge position by means of beam-on-beam transportation during transportation, so as to avoid the stress on the existing erected beam plates. The bridge erection machine is traversed to carry out full-width and whole-hole erection, which reduces the on-site workload and greatly improves the mechanized construction level of prefabricated corrugated steel web bridges.

In the transportation and erection process implemented by the present invention, the large-span corrugated steel web box girder is transported to the rear of the bridge erecting machine by using a combined modular truck to transport the beam on a single two-piece beam, so as to avoid the girder truck running on the erected beam. When the board is walking, the force is concentrated, causing the quality of the bridge to be damaged. By utilizing the lateral movement of the main truss of the bridge erection machine and the hoisting function to solve the erection problem of the outer side beams of the whole hole, a new technology is opened up for the rapid erection of large-span prefabricated corrugated beams.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications to equivalent changes. Example. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention still belong to the protection scope of the technical solutions of the present invention.

Claims (8)

1. a large-span prefabricated prefabricated corrugated web composite box girder transport frame construction method, is characterized in that, comprises the following steps: Step 1, modularly combining the modular transport vehicles, four modular transport vehicles are combined into a set of combined modular transport vehicles (1), and the overall width of the combined modular transport vehicles (1) is the width of two beams; In step 2, the corrugated steel web composite box girder is installed on the camel beam (2) of the combined modular transport vehicle (1), and is bundled firmly; Step 3, the combined modular transport vehicle (1) adopts the single-width walking mode to transport the corrugated steel web combined box girder to the rear beam feeding area of the bridge erecting machine (4); In step 4, the bridge erection machine (4) is used to erect the full-width beam body; the outriggers of the bridge erection machine (4) do not need to be moved, and the erection of the whole-hole girder body is completed by moving the crane (5) and the main truss (6); The fifth step is to install the steel bars at the positions of the diaphragm and the roof between the adjacent beam bodies, install the suspension formwork, and pour concrete. 2. The large-span prefabricated prefabricated corrugated web composite box girder transport frame construction method according to claim 1, characterized in that, in the step 2, the camel beam (2) is assembled into a box shape by section steel welding, and The connecting part of the combined modular transport vehicle (1) is a balance shaft (3). 3. The large-span prefabricated prefabricated corrugated web composite box girder transport frame construction method according to one of claims 1-2, characterized in that, in the step 3, the combined module transport vehicle (1) is Walk on the two beams that have completed the erection of the beam body, and the running track of the tire is the position of the beam rib. 4. The large-span prefabricated prefabricated corrugated web composite box girder transport frame construction method according to one of claims 1-3, characterized in that, in the step 4, the order of the frame beams is inner side beam, Outer beam, middle beam. 5. The large-span prefabricated prefabricated corrugated web composite box girder transport frame construction method according to claim 4, characterized in that, in the step 4, when erecting the inner side beam, the crane (5) issues a spreader (6) ) to connect and lift the beam to complete the erection of the beam. 6. The large-span prefabricated prefabricated corrugated web composite box girder transport frame construction method according to one of claims 1-5, characterized in that, in the step 4, when the outer side beams are erected, at the middle beam Temporary support (8) is installed at the site, wherein the top surface of the temporary support (8) is higher than the height of the design block (9) at the top of the pier; The body is connected, hoisted, and temporarily stored at the middle beam. 7. The large-span prefabricated prefabricated corrugated web composite box girder transport frame construction method according to claim 6, characterized in that, in the step 4, the crane (5) and the beam body of the outer side beam are unlocked and returned to position, the main trusses (6) on the left and right sides of the bridge erecting machine (4) move laterally synchronously, and stop when the main truss (6) is directly above the temporarily stored outer side beams, and the main truss (6) is installed with a suspension device ( 10), connect with the beam body of the outer side beam and lift it; the main truss (6) is moved laterally again, and stops after the main truss (6) is moved to the design position of the outer side beam, and the suspension device (10) is lowered to the beam body Design height, complete the beam body erection of the outer beam. 8. The large-span prefabricated prefabricated corrugated web composite box girder transport frame construction method according to claim 7, characterized in that, in the step 4, the erection of the middle beam is completed by the overhead crane (5); if necessary When erecting a bridge with multiple middle beams, the middle beam can be erected first by using the overhead crane (5), and the last middle beam adjacent to the outer side beams is erected last.

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