Construction method of bridge

Abstract

The invention relates to a construction method of a bridge, and belongs to the technical field of building bridge engineering. The bridge comprises a plurality of box girders, and the construction method comprises the following steps that a support is built, and the box girders are poured through side formworks on the support so that construction of the first box girder in every two adjacent box girders can be completed; the other support is set up, the sliding trolley is used for transferring the side formworks to the support, the box girders are poured, and construction of the second box girder in the two adjacent box girders is completed; and so on, construction of the box girder is completed, and the bridge is obtained. The side formworks are transferred through the sliding trolley, the sliding trolley has the flexible steering capacity, and even if the sliding trolley works in a narrow space, quick response and accurate control can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of building bridge engineering, and in particular to a method for constructing a bridge. Background Art

[0002] With the significant improvement of my country's economic strength and comprehensive national strength, the field of bridge construction has ushered in unprecedented complexity and challenges. In this context, the box girder side formwork sliding construction technology has been widely used in bridge construction at home and abroad due to its high efficiency and flexibility. However, the current application scope of this technology is mainly limited to single-span or relatively narrow box bridge projects. For example, the construction method of the hoisting formwork method requires the use of huge hoisting formwork equipment, which puts forward strict requirements on the working space and is accompanied by high cost expenditures. Therefore, it seems to be unable to cope with the construction of small-gap double-span cast-in-place box girders and bridges with larger beam widths. Summary of the invention

[0003] The embodiment of the present application provides a bridge construction method to solve the defect in the related art that the box girder side formwork sliding construction technology cannot be applied to various bridge projects due to construction limitations.

[0004] An embodiment of the present application provides a construction method for a bridge, which includes a plurality of box girders, comprising the following steps: building a support, and casting the box girder using the side form on the support to complete the construction of the first box girder of two adjacent box girders; building another support, and using a sliding trolley to transfer the side form to the support, and casting the box girder to complete the construction of the second box girder of two adjacent box girders; and so on, completing the construction of the box girder to obtain the bridge.

[0005] In some embodiments, the bracket is provided in two sets.

[0006] In some embodiments, a sliding trolley is used to transfer the side form to the bracket, which specifically includes the following steps: installing a sliding track on a constructed bracket; installing another sliding track on another constructed bracket, and connecting the two sliding tracks in sequence; movably connecting the sliding trolley to the two sliding tracks, and multiple sliding trolleys are arranged; after completing the construction of the first box girder of two adjacent box girders, using the jacks on multiple sliding trolleys to push the side form upward to separate the side form from the reinforced concrete; using the motor drive system on multiple sliding trolleys to drive the sliding trolley to drag the side form to the construction position of the second box girder of the two adjacent box girders.

[0007] In some embodiments, the sliding rails are provided in two sets.

[0008] In some embodiments, casting of the box girder specifically includes the following steps: reinforcing the side form with tension bolts and pouring reinforced concrete on the side form; tensioning and grouting the completed reinforced concrete and releasing the connection of the tension bolts between the side form.

[0009] In some embodiments, the construction method further comprises the following steps: filling a cushion layer on the pier body along the longitudinal direction of the bridge, and placing a plurality of prefabricated concrete blocks on the cushion layer;

[0010] Building the support on a plurality of concrete pre-blocks;

[0011] In some embodiments, the support is built on multiple precast concrete blocks, specifically comprising the following steps: fixing vertical poles on each precast concrete block, connecting horizontal poles between adjacent vertical poles, and arranging multiple layers of horizontal poles along the axial direction of the vertical poles until the designed elevation is reached; and when the spacing between multiple vertical poles is less than 50 cm, merging the vertical poles within the spacing range of less than 50 cm on the same precast concrete block, and ensuring that the distance between the center of the vertical pole and the base edge of the precast concrete block is not less than 25 cm.

[0012] In some embodiments, drainage ditches are provided at the edges of the cushion layer.

[0013] In some embodiments, connecting the two sliding rails comprises the following steps: welding the two sliding rails; and grinding the weld between the two sliding rails.

[0014] In some embodiments, at least two groups of jacks are provided on each of the sliding trolleys.

[0015] The beneficial effects of the technical solution provided by this application include:

[0016] An embodiment of the present application provides a method for constructing a bridge. After completing the construction of the first hole beam, the side form is transferred from the bracket to the second bracket by a sliding trolley to complete the construction of the second hole beam. The operation of the sliding trolley is usually performed through a remote control or an automated control system, which can achieve rapid response and precise control. When facing the construction of small-gap double-span cast-in-place box girders and bridges with a large beam surface width, it has flexible steering capabilities and is particularly suitable for operations in narrow spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1A schematic diagram of the overall structure provided for an embodiment of the present application;

[0019] Figure 2 A schematic diagram showing a sliding trolley provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of a display bracket provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram showing a drainage ditch provided in an embodiment of the present application;

[0022] Reference numerals:

[0023] 1. Side form; 10. Tension bolts; 2. Bracket; 20. Support; 3. Box girder; 4. Sliding trolley; 5. Sliding track; 6. Truss; 7. Pad; 8. Precast concrete block; 80. Vertical pole; 81. Horizontal pole; 9. Drainage ditch. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0025] The embodiment of the present application provides a bridge construction method, which can solve the defect that the box girder side formwork sliding construction technology cannot be applied to various bridge projects due to construction limitations.

[0026] See also Figures 1 to 4 As shown, the embodiment of the present application provides a construction method for a bridge, the bridge includes a plurality of box girders 3, and includes the following steps: first, a support 2 is built, and the box girder 3 is cast using the side form 1 on the support 2 to complete the construction of the first box girder 3 of two adjacent box girders 3; then another support 2 is built, and the support 2 can be started to be built during the construction of the first box girder 3 of two adjacent box girders 3, thereby realizing the parallelization of the construction process. This operation method significantly shortens the construction period of each box girder 3, thereby improving the overall construction efficiency. After the support 2 is built, the side form 1 is transferred to the support 2 by using the sliding trolley 4, and the box girder 3 is cast to complete the construction of the second box girder 3 of the two adjacent box girders 3; and so on, the construction of the box girder 3 is completed to obtain a bridge.

[0027] The construction of each box girder 3 is carried out on an independent support 2, avoiding mutual interference during the construction process; in addition, the introduction of the sliding trolley 4 makes the construction process more flexible and efficient. There is no need for manual handling or lifting. The side formwork 1 can be transferred and installed inside the construction site without occupying space for lifting operations. When facing small-gap double-span cast-in-place box girders 3 and bridge construction with a large beam surface width, it can also be flexibly controlled, effectively shortening the construction period. At the same time, the project quality, construction safety, etc. have also reached a high level, creating good economic and social benefits.

[0028] In the present application, casting the box girder 3 specifically includes the following steps: using tension bolts 10 to reinforce the side form 1, and pouring reinforced concrete on the side form 1. The use of tension bolts 10 can effectively reinforce the side form 1 to prevent the side form 1 from being deformed or displaced due to the pressure of reinforced concrete during the pouring of reinforced concrete. Casting reinforced concrete can form a solid box girder 3 structure that can withstand various loads on the bridge; tensioning and grouting the finished reinforced concrete, and releasing the connection of the tension bolts 10 between the side forms 1. Tensioning refers to stretching the prestressed steel bars to produce a prestressed effect and enhance the bearing capacity of the concrete. Grouting refers to injecting materials such as cement slurry into the prestressed duct to fill the duct and increase the bonding force between the prestressed steel bars and concrete. Tensioning and grouting can improve the bearing capacity and durability of the box girder 3 and ensure the safety of the bridge in long-term operation.

[0029] In addition, in other embodiments, after the construction of one of the box beams 3 of the span is completed, the overall bracket 2 is usually removed by a small-stroke drop frame, and the template is first withdrawn, and then the bracket 2 is removed by tilting and lifting, which seriously violates the safety lifting and hoisting regulations and has a large safety hazard. Therefore, in this application, two sets of brackets 2 are provided. During construction, during the construction of the second box beam 3 of the two adjacent box beams 3, the bracket 2 used in the construction of the first box beam 3 of the two adjacent box beams 3 is removed and transferred to the construction position of the first box beam 3 of the next two adjacent box beams 3. After the casting of the box beam 3 in the previous construction stage is completed, the side form 1 is further transferred using the sliding trolley 4, and the construction of the bridge is completed by analogy. Therefore, in the construction of this application, only two sets of brackets 2 are needed to be used in an alternating disassembly and assembly manner, and the side form 1 is also directly transferred from the bracket 2 to the next installation position, and is no longer removed from the bracket 2 to the ground for transfer. The application of this technology simplifies the process, reduces safety risks, saves construction time, reduces costs, and improves work efficiency.

[0030] In the present application, a sliding trolley 4 is used to transfer the side form 1 to the bracket 2, which specifically includes the following steps: installing a sliding track 5 on a constructed bracket 2; then installing another sliding track 5 on another constructed bracket 2, and connecting the two sliding tracks 5. Since the installation accuracy of the sliding track 5 directly affects the safety of the operation of the sliding trolley 4 and the accuracy of the transfer of the side form 1, ensuring the connection of the two sliding tracks 5 can ensure the stability of the sliding trolley 4; further, the sliding trolley 4 is movably connected to the two sliding tracks 5, and multiple sliding trolleys 4 are arranged, specifically, a sliding trolley 4 is arranged every 4 meters. This layout not only ensures the stability of the transfer of the side form 1, but also ensures the construction efficiency. Multiple sliding trolleys The collaborative operation of the sliding trolley 4 can more effectively share the weight of the side form 1 and reduce the load of a single trolley; after completing the construction of the first box girder 3 of the two adjacent box girders 3, the jacks of the sliding trolley 4 and the locking rods of the formwork must be firmly installed to ensure that the side form 1 will not fall off or deform during the transfer process, and there are at least 2 groups of jacks on each sliding trolley 4, which can further improve the stability and safety of the jacking process; finally, the jacks on multiple sliding trolleys 4 are used to push the side form 1 upward to separate the side form 1 from the reinforced concrete; then the motor drive system on multiple sliding trolleys 4 is used to drive the sliding trolley 4 to drag the side form 1 to the construction position of the second box girder 3 of the two adjacent box girders 3.

[0031] In the present application, the motor drive system on the sliding trolley 4 drives the sliding trolley 4 to drag the side form 1 to transfer, which is specifically divided into first dragging the side form 1 away from the reinforced concrete box girder 3 along the transverse bridge direction, and then dragging the side form 1 along the longitudinal bridge direction to the construction position of the second box girder 3 of the two adjacent box girders 3. The use of multiple sliding trolleys 4 to work together greatly shortens the time for transferring the side form 1 and improves the overall construction efficiency. The smooth and continuous movement of the sliding trolley 4 ensures that the side form 1 will not be damaged during the transfer process, thereby ensuring the construction quality of the next box girder 3. The mechanized operation of the sliding trolley 4 solves the problem of difficult disassembly, assembly and transportation of the side form 1 of the cast-in-place box girder 3, reduces the process, facilitates construction, reduces the labor intensity of operators, does not require the investment of lifting and transportation machinery and equipment, saves costs, and improves production efficiency.

[0032] This application uses the jacks on multiple sliding dollies 4 to push the side form 1 upward to separate the side form 1 from the reinforced concrete. Specifically, the following steps are adopted: slide the sliding dollies 4 to the bottom of the side form 1, then loosen the adjustment support on the side form 1 so that the side form 1 is completely placed on the sliding dollies 4, and install locking rods at the trusses 6 of the side form 1 and the cross beams in the sliding dollies 4. The trusses 6 are fixed to one side of the side form 1. After checking that the side form 1 and the dollies are tightly connected, the side form 1 can be slid. The speed should not be too fast during the sliding process, and it should move forward steadily and at a uniform speed to ensure safety. After sliding the side form 1 to the specified position, release the locking rod and use the adjustment support to separate the side form 1 from the dollies. The side form 1 in the present application is composed of multiple templates. Therefore, when sliding the side form 1, first release the connection between the multiple templates, and then use the sliding trolley 4 to transfer each template in turn. After the transfer of the first template is completed, slide the sliding trolley 4 to the bottom of the second template, and repeat this cycle until the entire set of side form 1 is moved to the next construction position.

[0033] In the present application, the side form 1 is slid to the construction position for installation through the sliding track 5, which solves the unfavorable factors such as sliding difficulty, narrow operating space, and heavy weight of the side form 1. The setting of the sliding track 5 not only effectively reduces the difficulty of sliding the side form 1, but also effectively shortens the construction period. At the same time, the project quality and construction safety also reach a higher level.

[0034] In the present application, two sets of sliding tracks 5 are provided, and the sliding tracks 5 are made of channel steel. As a high-strength steel, channel steel can bear a large load. Therefore, the sliding tracks 5 made of channel steel have good bearing capacity and stability, which ensures the stability and safety of the sliding trolley 4 when moving on the track. The two sets of sliding tracks 5 are respectively installed on the two brackets 2 in the construction of two adjacent box beams 3. And the two sets of sliding tracks 5 are used in conjunction with the two sets of brackets 2. When the brackets 2 are disassembled and used alternately, the sliding tracks 5 are also disassembled and used in the next construction position. It is only necessary to pay attention to the smooth installation of the sliding tracks 5.

[0035] The sliding track 5 is installed at the bracket 2 below the side form 1, and its center position is 30 cm away from the horizontal center line of the bracket 2. Taking into account the actual situation and space limitations of the construction site, this design prevents the sliding trolley 4 from colliding with the side form 1 or other construction equipment when moving, and also provides sufficient operating space for construction personnel. Due to the stability of the sliding track 5 and the rationality of the spatial layout, construction personnel can complete the transfer of the side form 1 more efficiently. This shortens the construction period, reduces construction costs, and also increases the overall construction speed of the bridge.

[0036] In the present application, the two sliding rails 5 are connected smoothly, including the following steps: welding the two sliding rails 5; and then grinding the weld between the two sliding rails 5. The joint of the sliding rail 5 is welded, the weld is full, and the grinding is smooth to reduce the friction coefficient of the sliding trolley 4 and ensure the stability of the sliding trolley 4.

[0037] In the present application, the construction method provided also includes the following steps: filling a cushion layer 7 on the pier body along the longitudinal direction of the bridge, and setting a plurality of precast concrete blocks 8 on the cushion layer 7; and then building a bracket 2 on the plurality of precast concrete blocks. First, the cushion layer 7 includes but is not limited to being made of cement stabilized soil, coarse gravel soil and concrete. After the pier body construction is completed and the surface is cleared, fill 60cm thick cement stabilized soil or coarse gravel soil, compact and level it, and pour 3cm thick C20 concrete to obtain the cushion layer 7. Finally, a drainage ditch 9 is set at the edge of the cushion layer 7 to prevent water accumulation at the bottom of the bracket 2. In addition, the treated cushion layer 7 should be subjected to a bearing capacity test, and after inspection, the layout should be carried out according to the construction drawings, and the precast concrete blocks 8 should be installed. The bracket 2 is built on the precast concrete blocks 8. After the bracket 2 is removed, the precast concrete blocks 8 can also be reused to achieve the effect of reducing costs. It should be noted that the prefabricated concrete blocks 8 are easily damaged during use, which will affect their flatness and plane dimensions, and thus affect the safe use of the bracket 2. Good protection should be done on site to avoid bumps as much as possible to ensure their flatness and plane dimensions. The prefabricated concrete blocks 8 with severe damage should be replaced in time, and the specific number of reuses must be determined based on the on-site protection conditions.

[0038] In the present application, the support 2 is built on multiple precast concrete blocks 8, specifically including the following steps: fixing a vertical pole 80 on each precast concrete block 8, connecting a horizontal pole 81 between adjacent vertical poles 80, and arranging multiple layers of the horizontal poles 81 along the axial direction of the column until the design elevation is reached, and then installing a bracket 20 on the top of the support 2, and then installing the side mold 1 on the bracket 20; and when the spacing between multiple vertical poles 80 is less than 50cm, merging the vertical poles 80 within the spacing range of less than 50cm on the same precast concrete block 8, and ensuring that the distance between the center of the vertical pole 80 and the foundation edge of the precast concrete block 8 is not less than 25cm. The support 2 built on multiple precast concrete blocks 8 is simple in structure and stable, and the support 2 has significant effects during use, including improving the stability of the support 2, enhancing the bearing capacity, optimizing the construction efficiency, ensuring the construction safety, and having strong adaptability.

[0039] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0040] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0041] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for constructing a bridge, the bridge comprising a plurality of box girders (3), characterized in that: It includes the following steps: Building a support (2), and using the side form (1) on the support (2) to cast the box beam (3), so as to complete the construction of the first box beam (3) of two adjacent box beams (3); Building another support (2), using a sliding trolley (4) to transfer the side form (1) to the support (2), and casting the box beam (3) to complete the construction of the second box beam (3) of the two adjacent box beams (3); Similarly, the construction of the box girder (3) is completed to obtain a bridge.

2. A bridge construction method as claimed in claim 1, characterized in that: The bracket (2) is provided with two sets.

3. A bridge construction method as claimed in claim 1, characterized in that: The side mold (1) is transferred to the support (2) using a sliding trolley (4), which specifically includes the following steps: Installing a sliding track (5) on a constructed support (2); Install another sliding track (5) on another constructed support (2), and connect the two sliding tracks (5) in sequence; The sliding trolley (4) is movably connected to the two sliding rails (5), and a plurality of the sliding trolleys (4) are arranged; After the construction of the first box beam (3) of the two adjacent box beams (3) is completed, the jacks on the plurality of sliding trolleys (4) are used to push the side form (1) upwards so as to separate the side form (1) from the reinforced concrete; The sliding trolley (4) is driven by a motor drive system on a plurality of the sliding trolleys (4) The side formwork (1) is dragged and transferred to the construction position of the second box beam (3) of the two adjacent box beams.

4. A bridge construction method as claimed in claim 3, characterized in that: The sliding rails (5) are provided with two sets.

5. A bridge construction method as claimed in claim 1, characterized in that: Casting the box beam (3) specifically includes the following steps: The side form (1) is reinforced with tension bolts (10), and reinforced concrete is poured on the side form (1); The reinforced concrete that has been poured by tensioning and grouting is released, and the connection between the tension bolts (10) between the side forms (1) is released.

6. A bridge construction method as claimed in claim 1, characterized in that: The construction method further comprises the following steps: A cushion layer (7) is built on the pier body along the longitudinal direction of the bridge, and a plurality of prefabricated concrete blocks (8) are arranged on the cushion layer (7); The support (2) is built on a plurality of concrete pre-blocks (8).

7. A bridge construction method as claimed in claim 6, characterized in that: The support (2) is constructed on a plurality of prefabricated concrete blocks (8), and specifically comprises the following steps: A vertical pole (80) is fixed on each prefabricated concrete block (8), and horizontal poles (81) are connected between adjacent vertical poles (80), and the horizontal poles (81) are arranged in multiple layers along the axial direction of the vertical pole until the designed elevation is reached; When the spacing between multiple vertical poles (80) is less than 50 cm, the vertical poles (80) within the spacing range less than 50 cm are combined on the same prefabricated concrete block (8), and it is ensured that the distance between the center of the vertical pole (80) and the foundation edge of the prefabricated concrete block (8) is not less than 25 cm.

8. A bridge construction method as claimed in claim 6, characterized in that: A drainage ditch (9) is arranged at the edge of the cushion layer (7).

9. A bridge construction method as claimed in claim 3, characterized in that: The two sliding rails (5) are connected in sequence, comprising the following steps: Welding two sliding rails (5); The weld between the two sliding rails (5) is ground.

10. A bridge construction method as claimed in claim 3, characterized in that: At least two groups of jacks are provided on each sliding trolley (4).

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