Double-limb thin-wall pier No.0 block cast-in-place bracket and mounting and using method thereof

Abstract

The invention provides a double-limb thin-wall pier No.0 block cast-in-place bracket and a mounting and using method thereof.The double-limb thin-wall pier No.0 block cast-in-place bracket comprises two bracket assemblies and a plurality of longitudinal distribution girders, each bracket assembly comprises a supporting piece, a first main cross beam and a second main cross beam, and each supporting piece comprises a bottom bracket, a top bracket and a triangular bracket; the bottom bracket is arranged on the outer side face of the corresponding thin-wall pier, the top bracket is arranged on the inner side face of the corresponding thin-wall pier, one end of the bottom bracket and one end of the top bracket are inserted into an embedded box embedded in the corresponding thin-wall pier, the bottom bracket is arranged on the corresponding thin-wall pier through a split screw, and the bottom of the triangular bracket is supported on the bottom bracket. The top of the triangular bracket is connected with a top bracket through an opposite-pull screw rod; unloading devices are arranged on the top surfaces of the triangular bracket and the top bracket; the first main cross beam is laid on unloading devices of a plurality of triangular brackets; and the second main cross beam is placed on the unloading devices of the top brackets. The material utilization rate of the bracket can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction, in particular to a double-limb thin-wall pier No. 0 block cast-in-place bracket and its installation and use method. BACKGROUND

[0002] The key process for the construction of the No. 0 block of the continuous rigid frame bridge is the design and construction of the cantilever segment formwork and the construction platform support system, and the commonly used construction methods include: Method 1: using disc buckle, steel pipe, etc. to set up a cast-in-place support system. This method is usually only applicable to the case where the pier column is relatively low and the bottom of the pier is flat and the geology is good. With the increase of the height of the pier column, the demand for support materials increases, and the construction cost increases. In the case of complex geographical environment of the bridge site, the overall stability of the support is difficult to control, and safety accidents such as support collapse are prone to occur.

[0003] Method 2: using a pier pre-buried installation cast-in-place bracket system. This method is not limited by the height of the pier and the geographical environment of the bridge site. In the process of pier construction, the bracket bracket or bracket girder components are pre-buried according to the design structure, and then the bracket system is installed relying on the pre-buried components. The construction is convenient and the cost is controllable.

[0004] Since the continuous rigid frame bridge is often used for highways and railways crossing valleys, gullies and deep water channels, the bridge site topography and geology are complex. On the other hand, when the height of the bridge is too high or the span is larger, the main pier of the bridge will be designed as a double-limb thin-wall pier with strong bending resistance. Therefore, in the field of construction of the No. 0 block of the double-limb thin-wall pier of the continuous rigid frame bridge, method 2 is more widely used, but there is still a lot of room for optimization in the design of the structural materials of the bracket and the installation process of the bracket. For example: the structural material design of the existing technology of the No. 0 block construction bracket of the double-limb thin-wall pier is usually only for the construction of the No. 0 block of the double-limb thin-wall pier, and cannot adapt to the construction of other cast-in-place structures of the bridge. After the construction of the No. 0 block of the double-limb thin-wall pier is completed, the double-limb thin-wall pier No. 0 block construction bracket that is disassembled will be idle, resulting in low utilization rate of the structural materials of the bracket. In addition, in the existing technology, the high pier shaft is constructed by using the hydraulic climbing formwork process, and the installation of the No. 0 block construction bracket of the double-limb thin-wall pier is usually also installed by using the hydraulic climbing formwork. This installation method causes conflict between the main components of the climbing formwork operation platform of the climbing formwork and the No. 0 block construction bracket, and the climbing formwork operation platform needs to be removed before the bracket is installed and fixed, which cannot effectively guarantee the safety of the workers during the installation and fixing process of the bracket. At the same time, since the hydraulic climbing formwork is used to construct the high pier shaft at the same time as the installation of the No. 0 block construction bracket, the pier column formwork used for the cast-in-place construction of the high pier shaft during the construction of the hydraulic climbing formwork will hinder the connection between the No. 0 block construction bracket and the high pier shaft. Therefore, in the existing technology, the pier column formwork needs to be cut before the installation of the No. 0 block construction bracket, which will damage part of the formwork and reduce the turnover rate of the pier column formwork. SUMMARY

[0005] The present invention aims to solve at least one of the technical problems mentioned in the background art above, and provides a cast-in-place bracket for a double-limb thin-walled pier No. 0 block, which can improve the material utilization rate of the bracket.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A cast-in-place bracket for a double-limb thin-walled pier (block 0) includes two bracket assemblies respectively installed on the double-limb thin-walled pier and several longitudinal distribution beams. Each bracket assembly includes a support member, a first main crossbeam, and a second main crossbeam. The bracket assembly includes multiple support members spaced apart along the transverse direction of the bridge. Each support member includes a bottom bracket, a top bracket, and a triangular bracket. The bottom bracket is located on the outer side of the corresponding thin-walled pier facing away from the other thin-walled pier. The top bracket is installed on the inner side of the corresponding thin-walled pier facing the other thin-walled pier. One end of both the bottom and top brackets is inserted into a pre-embedded box within the corresponding thin-walled pier. The bottom bracket is installed on the corresponding thin-walled pier via tie rods. The bottom of the triangular bracket is supported on the bottom bracket. A pad is sandwiched between the bottom of the triangular bracket and the bottom bracket, and the top of the triangular bracket is connected to the top bracket by a tie rod; a dropping device is installed on the top surface of both the triangular bracket and the top bracket; the first main crossbeam is laid on the dropping devices of several triangular brackets; the second main crossbeam is placed on the dropping devices of several top brackets; both the first main crossbeam and the second main crossbeam include two parallel and spaced I-beams, which are welded together by several steel plates, which are spaced apart along the length of the I-beams, and an clearance opening is formed between adjacent steel plates and the two I-beams for the hanging basket to pass through; the longitudinal distribution beam is laid on the first main crossbeam and the second main crossbeam.

[0007] Furthermore, the cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier also includes a first construction platform, a second construction platform, a third construction platform, and a fourth construction platform connected to the corresponding thin-walled pier. The first construction platform is located at the bottom corbel, the second construction platform is located opposite to the first construction platform, the third construction platform is located between the tops of two adjacent triangular brackets, and the fourth construction platform is located at the top corbel.

[0008] Furthermore, the first construction platform, the second construction platform, the third construction platform, and the fourth construction platform are all connected to the corresponding thin-walled piers via pre-embedded connectors. The pre-embedded connectors include pre-embedded threaded steel bars, connecting sleeves, and connecting threaded steel bars. The pre-embedded threaded steel bars and the connecting sleeves are all pre-embedded in the corresponding thin-walled piers. One end of the pre-embedded threaded steel bar is threadedly connected to one end of the connecting sleeve; one end of the connecting threaded steel bar is threadedly connected to the other end of the connecting sleeve. The first construction platform, the second construction platform, the third construction platform, and the fourth construction platform are fixedly connected to the other end of the corresponding connecting threaded steel bar.

[0009] Furthermore, the tie rod includes a tie rod portion and two nuts. The tie rod portion is fitted with a sleeve pre-embedded in the corresponding thin-walled pier. The two nuts are respectively threaded to one end of the tie rod portion located outside the thin-walled pier. The bottom bracket is provided with a first tie hole. One end of the tie rod portion connected to the bottom bracket passes through the first tie hole, and the two nuts respectively abut against the outer surfaces of the bottom bracket and the thin-walled pier.

[0010] Furthermore, the top bracket is provided with a second pair of pull holes, and the top of the triangular bracket is provided with a connecting hole; one end of the pull screw connected to the top bracket passes through the second pair of pull holes, and the other end passes through the connecting hole, and the two nuts respectively abut against the top bracket and the triangular bracket.

[0011] Furthermore, there are two first main crossbeams, which are arranged in parallel and spaced apart.

[0012] Furthermore, the longitudinal distribution beam includes two sets of flange plate longitudinal distribution beams and an inner box bottom longitudinal distribution beam. The two sets of flange plate longitudinal distribution beams are arranged at intervals relative to each other. Each flange plate longitudinal distribution beam is supported on the first main crossbeam and the second main crossbeam of the two bracket assemblies. The inner box bottom longitudinal distribution beam is laid on the second main crossbeam of the two bracket assemblies and is located between the two sets of flange plate longitudinal distribution beams.

[0013] Furthermore, each of the bracket assemblies includes a chamfered construction truss, which is supported on the first main crossbeam corresponding to the bracket assembly and is disposed between the two sets of longitudinal distribution beams of the flange plates.

[0014] This invention also provides a method for installing the cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier, comprising the following steps: When constructing a double-limb thin-walled pier using hydraulic climbing formwork, the pre-embedded connecting parts of the first construction platform, the second construction platform, the third construction platform, and the fourth construction platform are pre-embedded, so that one end of the pre-embedded threaded steel is connected to the reinforcing steel in the thin-walled pier, and the other end of the pre-embedded threaded steel is threadedly connected to one end of the connecting sleeve. After the construction of the double-limb thin-walled pier is completed, one end of the connecting threaded steel is threaded into the other end of the connecting sleeve on the hydraulic climbing formwork construction platform. Then, the first construction platform, the second construction platform, the third construction platform and the fourth construction platform are fixedly connected to the corresponding connecting threaded steel. Finally, the hydraulic climbing formwork is removed. The bottom brackets are installed on the first construction platform and the second construction platform, and the bottom brackets are fixed to the double-limb thin-walled piers by tie rods; The top bracket and triangular bracket are installed on the first construction platform, the third construction platform and the fourth construction platform, so that the bottom of the triangular bracket is supported on the bottom bracket, a pad is sandwiched between the bottom of the triangular bracket and the bottom bracket, and the top of the triangular bracket is connected to the top bracket through a tie rod. A dismounting device is installed on the top surface of the triangular bracket and the top corbel. A first main crossbeam and a second main crossbeam are laid on the dismounting device, and then a longitudinal distribution beam is laid on the first main crossbeam and the second main crossbeam.

[0015] The present invention further provides a method for using the cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier, comprising the following steps: Provide a cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier, and lay a formwork on the longitudinal distribution beam to pour concrete to form the No. 0 block of the double-limb thin-walled pier; The first main beam, the second main beam, the longitudinal distribution beam, and the template are moved downwards by the unloading device for demolding, and then the bracket assembly is removed from the double-limb thin-walled pier. When using a cantilever cast-in-place formwork for the cast-in-place construction of bridge beams and slabs, the removed first and second main crossbeams are used as crossbeams of the cantilever cast-in-place formwork. When constructing the cast-in-place section of the side span, the bottom corbel, the top corbel, and the triangular bracket are used as construction supports for the cast-in-place section of the side span. During construction, the bottom corbel and the top corbel are respectively located on opposite sides of the pier and connected together by tie rods. The top of the bottom corbel and the top corbel are each equipped with a triangular bracket. A pad is sandwiched between the bottom of the triangular bracket and the bottom corbel or the top corbel. The tops of the triangular brackets on both sides of the pier are connected together by tie rods.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects: The aforementioned cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier features a split design for its bottom corbel, top corbel, and triangular bracket. These components can be combined in various ways to create cast-in-place brackets with different structures, making them suitable for cast-in-place construction of the No. 0 block and the side span sections. Simultaneously, the first and second main crossbeams utilize a double-I-beam structure, with the double I-beams welded together from steel plates to ensure sufficient strength. Furthermore, the two I-beams are spaced apart, and adjacent steel plates are also spaced apart, creating clearance openings between adjacent steel plates and the two I-beams for the hanging basket equipment to pass through. This allows it to be used as a crossbeam for the cantilever cast-in-place hanging basket, effectively improving the material utilization rate of the bracket components and reducing construction costs.

[0017] For the aforementioned cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier, during the construction of the double-limb thin-walled pier using hydraulic climbing formwork, the pre-embedded connecting parts for the first, second, third, and fourth construction platforms are pre-embedded. After the construction of the double-limb thin-walled pier is completed, the first, second, third, and fourth construction platforms are then installed onto the thin-walled pier on the hydraulic climbing formwork construction platform using the pre-embedded connecting parts. Since the main components of the hydraulic climbing formwork construction platform will not conflict with the first, second, third, and fourth construction platforms, they can be adjusted during the construction of the first, second, third, and fourth construction platforms. For safety, the hydraulic climbing formwork will be removed after the first, second, third, and fourth construction platforms are completed. Then, the installed first, second, third, and fourth construction platforms will be used to install the brackets, triangular supports, etc. The setup of the first, second, third, and fourth construction platforms can meet the auxiliary work needs of personnel during the installation of brackets, triangular supports, etc., ensuring the safety of personnel working at height and effectively reducing safety risks. Furthermore, since the hydraulic climbing formwork has been removed, the conflict between the main components of the climbing formwork platform and part of the cast-in-place bracket of the No. 0 block of the double-limb thin-walled pier can be resolved.

[0018] The aforementioned cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier uses a mechanical connection consisting of a first construction platform, a second construction platform, a third construction platform, and a fourth construction platform, which includes pre-embedded threaded steel bars, connecting sleeves, and connecting threaded steel bars. This solves the problem of installing the bracket without cutting the pier column formwork, effectively ensuring the quality of the formwork and improving the formwork turnover rate. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of the cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier according to a preferred embodiment of the present invention.

[0020] Figure 2 for Figure 1Enlarged view of part of the structure.

[0021] Figure 3 for Figure 1 A top-view structural diagram.

[0022] Figure 4 for Figure 1 A schematic diagram of the cross-section along line AA.

[0023] Figure 5 for Figure 1 A schematic diagram of the cross-section along line BB.

[0024] Figure 6 This is a schematic diagram illustrating the arrangement of the pre-embedded box, sleeve, and pre-embedded connector within the double-limb thin-walled pier in a preferred embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of the first construction platform, the second construction platform, the third construction platform and the fourth construction platform in a preferred embodiment of the present invention.

[0026] Figure 8 This is a structural diagram of the bottom corbel, top corbel, and triangular bracket used as a support for cast-in-place construction of the side span in a preferred embodiment of the present invention.

[0027] Figure 9 This is a top view of the first main crossbeam and the second main crossbeam in a preferred embodiment of the present invention.

[0028] Figure 10 for Figure 9 The left view.

[0029] Explanation of main component symbols 100. Cast-in-place bracket for double-limb thin-walled pier block 0; 10. Bracket assembly; 11. Support component; 111. Bottom corbel; 112. First tie rod hole; 113. Top corbel; 114. Second tie rod hole; 115. Triangular bracket; 116. Connecting hole; 117. Tie rod; 1171. Tie rod part; 1172. Nut; 119. Spacer; 13. First main crossbeam; 15. Second main crossbeam; 16. I-beam; 17. Steel plate; 18. Clearance opening; 30. Longitudinal... 31. Longitudinal distribution beam of flange plate; 33. Longitudinal distribution beam of inner box bottom; 40. Embedded box; 50. Sleeve; 60. Unloading device; 70. Chamfered construction truss; 81. First construction platform; 82. Second construction platform; 83. Third construction platform; 84. Fourth construction platform; 85. Base plate; 86. Guardrail; 90. Embedded connector; 91. Embedded threaded steel; 92. Connecting sleeve; 93. Connecting threaded steel; 200. Thin-walled pier; 300. Bridge pier. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] Please also see Figure 1 and Figure 3 A preferred embodiment of the present invention provides a cast-in-place support 100 for the No. 0 block of a double-limb thin-walled pier, used for the cast-in-place construction of the No. 0 block of the double-limb thin-walled pier. The cast-in-place support 100 for the No. 0 block of the double-limb thin-walled pier includes two support assemblies 10 respectively installed on the double-limb thin-walled pier 200 and a plurality of longitudinal distribution beams 30 installed on the two support assemblies 10.

[0034] Please see also Figure 2 The bracket assembly 10 includes a support member 11, a first main crossbeam 13, and a second main crossbeam 15. Multiple support members 11 are spaced apart along the transverse direction of the bridge. Each support member 11 includes a bottom bracket 111, a top bracket 113, and a triangular bracket 115. The bottom bracket 111 is located on the outer side of the corresponding thin-walled pier 200 facing away from the other thin-walled pier 200. The top bracket 113 is installed on the inner side of the corresponding thin-walled pier 200 facing the other thin-walled pier 200. One end of both the bottom bracket 111 and the top bracket 113 is inserted into a pre-embedded box 40 within the corresponding thin-walled pier 200. The bottom bracket 111 is installed on the corresponding thin-walled pier 200 via a tie rod 117, and the triangular bracket 115 is connected to the top bracket 113 via the tie rod 117.

[0035] Please see also Figure 6Specifically, embedded boxes 40 are pre-embedded within the thin-walled pier 200 corresponding to the bottom bracket 111 and the top bracket 113, and sleeves 50 are pre-embedded within the thin-walled pier 200 corresponding to the tie rods 117. One end of the bottom bracket 111 and the top bracket 113 is inserted into the corresponding embedded box 40, and the tie rods 117 pass through the corresponding sleeves 50. The tie rods 117 include a screw part 1171 and two nuts 1172. The screw part 1171 passes through the corresponding sleeves 50, and the two nuts 1172 are respectively threaded to the two ends of the screw part 1171 located outside the thin-walled pier 200. The bottom bracket 111 is provided with a first pair of pull holes 112. One end of the screw part 1171 connected to the bottom bracket 111 passes through the first pair of pull holes 112, and two nuts 1172 respectively abut against the outer surfaces of the bottom bracket 111 and the thin-walled block 200 to detachably connect the bottom bracket 111 and the thin-walled block 200 together.

[0036] The bottom of the triangular bracket 115 is supported on the bottom bracket 111, and a pad 119 is sandwiched between the bottom of the triangular bracket 115 and the bottom bracket 111. The top of the triangular bracket 115 is connected to the top bracket 113 via a tie rod 117. Specifically, in this embodiment, the top bracket 113 is provided with a second tie hole 114 for the tie rod 117 to pass through; the top of the triangular bracket 115 is provided with a connecting hole 116; one end of the screw part 1171 connected to the top bracket 113 passes through the second tie hole 114, and the other end passes through the connecting hole 116. Two nuts 1172 abut against the top bracket 113 and the triangular bracket 115 respectively, so as to detachably connect the triangular bracket 115, the top bracket 113 and the thin-walled block 200 together.

[0037] A dismounting device 60 is installed on the top surface of both the triangular bracket 115 and the top corbel 113. The dismounting device 60 can be a sand cylinder or a shim, which are existing technologies. The first main crossbeam 13 is placed on the dismounting devices 60 of several triangular brackets 115; in this embodiment, there are two first main crossbeams 13, which are arranged in parallel and spaced apart. The second main crossbeam 15 is placed on the dismounting devices 60 of several top corbels 113, and both the second main crossbeam 15 and the first main crossbeam 13 are parallel to the transverse direction of the bridge. Both the first main crossbeam 13 and the second main crossbeam 15 include two parallel H-beams (not shown), which are welded together using steel plates (not shown in the figure).

[0038] The longitudinal distribution beam 30 is vertically laid on the first main crossbeam 13 and the second main crossbeam 15. In this embodiment, the longitudinal distribution beam 30 includes two sets of flange plate longitudinal distribution beams 31 and an inner box bottom longitudinal distribution beam 33. The two sets of flange plate longitudinal distribution beams 31 are arranged at intervals relative to each other. Each flange plate longitudinal distribution beam 31 is supported on the first main crossbeam 13 and the second main crossbeam 15 of the two bracket assemblies 10. The inner box bottom longitudinal distribution beam 33 is laid on the second main crossbeam 15 of the two bracket assemblies 10 and is located between the two sets of flange plate longitudinal distribution beams 31. Each bracket assembly 10 includes a chamfered construction truss 70, which is supported on the first main crossbeam 13 of the corresponding bracket assembly 10 and is located between the two sets of flange plate longitudinal distribution beams 31.

[0039] Please see also Figure 4 and Figure 5 The cast-in-place bracket 100 for the double-limb thin-walled pier block 0 also includes a first construction platform 81, a second construction platform 82, a third construction platform 83, and a fourth construction platform 84 connected to the corresponding thin-walled pier 200. The first construction platform 81 is located at the bottom corbel 111, the second construction platform 82 is located opposite to the first construction platform 81, the third construction platform 83 is located between the tops of two adjacent triangular brackets 115, and the fourth construction platform 84 is located at the top corbel 113. Please refer to [further details omitted]. Figure 7 In this embodiment, the structures of the first construction platform 81, the second construction platform 82, the third construction platform 83, and the fourth construction platform 84 are largely the same, each including a base plate 85 and a guardrail 86 surrounding the base plate 85. The first construction platform 81, the second construction platform 82, the third construction platform 83, and the fourth construction platform 84 are all connected to the corresponding thin-walled piers 200 via embedded connectors 90. Specifically, the embedded connector 90 includes an embedded threaded steel bar 91, a connecting sleeve 92, and a connecting threaded steel bar 93. The embedded threaded steel bar 91 and the connecting sleeve 92 are both embedded within the corresponding thin-walled piers 200. One end of the embedded threaded steel bar 91 is threadedly connected to one end of the connecting sleeve 92; one end of the connecting threaded steel bar 93 is threadedly connected to the other end of the connecting sleeve 92. The first construction platform 81, the second construction platform 82, the third construction platform 83, and the fourth construction platform 84 are fixedly connected to the other end of the corresponding connecting threaded steel bar 93. In this embodiment, the base plate 85 and guardrail 86 of the first construction platform 81, the second construction platform 82, the third construction platform 83 and the fourth construction platform 84 are all connected to the corresponding thin-walled pier 200 by pre-embedded connectors 90. That is, the base plate 85 or the guardrail 86 is fixedly connected to the end of the connecting threaded steel 93 away from the connecting sleeve 92 by welding or other means.

[0040] The present invention also provides a method for installing the cast-in-place bracket 100 for the No. 0 block of the double-limb thin-walled pier, comprising the following steps: S1. When constructing the double-limb thin-walled pier 200 using hydraulic climbing formwork (not shown), the pre-embedded connectors 90 of the first construction platform 81, the second construction platform 82, the third construction platform 83 and the fourth construction platform 84 are pre-embedded, so that one end of the pre-embedded threaded steel bar 91 is connected to the reinforcing bar (not shown) in the thin-walled pier, and the other end of the pre-embedded threaded steel bar 91 is threadedly connected to one end of the connecting sleeve 92.

[0041] S2, After the construction of the double-limb thin-walled pier 200 is completed, one end of the connecting threaded steel bar 93 is threaded into the other end of the connecting sleeve 92 on the hydraulic climbing formwork construction platform. Then, the first construction platform 81, the second construction platform 82, the third construction platform 83 and the fourth construction platform 84 are fixedly connected to the corresponding connecting threaded steel bars 93. Specifically, the base plate 85 and guardrail 86 of the first construction platform 81, the second construction platform 82, the third construction platform 83 and the fourth construction platform 84 are welded and fixed to the corresponding connecting threaded steel bars 93. Finally, the hydraulic climbing formwork is removed.

[0042] The dismantling method of hydraulic climbing formwork is existing technology, and will not be elaborated here to save space.

[0043] S3, the bottom bracket 111 is installed on the first construction platform 81 and the second construction platform 82, and the bottom bracket 111 is fixed to the double-limb thin-walled pier 200 by tie rod 117.

[0044] Specifically, in step S3, the worker inserts one end of the bottom bracket 111 into the pre-embedded box 40 embedded in the thin-walled block 200 on the first construction platform 81 and the second construction platform 82. Then, the screw part 1171 of the tie rod 117 passes through the first tie hole 112 of the bottom bracket 111 and the sleeve 50 embedded in the thin-walled block 200. Finally, the two nuts 1172 are threaded to the opposite ends of the screw part 1171 and abut against the outer surfaces of the bottom bracket 111 and the thin-walled block 200, respectively.

[0045] S4, the top bracket 113 and the triangular bracket 115 are installed on the first construction platform 81, the third construction platform 83 and the fourth construction platform 84, so that the bottom of the triangular bracket 115 is supported on the bottom bracket 111, and a pad 119 is sandwiched between the bottom of the triangular bracket 115 and the bottom bracket 111. The top of the triangular bracket 115 is connected to the top bracket 113 through the tie rod 117.

[0046] Specifically, in step S4, workers on the first construction platform 81, the third construction platform 83, and the fourth construction platform 84 insert one end of the top bracket 113 into the pre-embedded box 40 embedded in the thin-walled pier 200, support the bottom of the triangular bracket 115 on the bottom bracket 111, and place a pad 119 between the bottom of the triangular bracket 115 and the bottom bracket 111 to ensure that the triangular bracket 115 and the bottom bracket 111 are in close contact; then, the screw part 1171 of the tie rod 117 passes through the second tie hole 114 of the top bracket 113, the sleeve 50 embedded in the thin-walled pier 200, and the connecting hole 116 of the triangular bracket 115; finally, the two nuts 1172 are threaded to the opposite ends of the screw part 1171 and abut against the top bracket 113 and the triangular bracket 115 respectively.

[0047] S5, a dismounting device 60 is installed on the top surface of the triangular bracket 115 and the top bracket 113, the first main crossbeam 13 and the second main crossbeam 15 are laid on the dismounting device 60, and then the longitudinal distribution beam 30 is laid on the first main crossbeam 13 and the second main crossbeam 15.

[0048] This invention also provides a method for using the cast-in-place bracket 100 for the No. 0 block of the double-limb thin-walled pier, including the following steps: A cast-in-place bracket 100 for the double-limb thin-walled pier block 0 is provided. A formwork is laid on the longitudinal distribution beam 30 for concrete pouring to form the double-limb thin-walled pier block 0. The first main beam 13, the second main beam 15, the longitudinal distribution beam 30, and the formwork are moved downwards by the unloading device 60 for demolding. Then, the cast-in-place bracket 100 of the double-limb thin-walled pier No. 0 block is removed from the double-limb thin-walled pier 200. Specifically, when removing the cast-in-place bracket 100 of the double-limb thin-walled pier No. 0 block, firstly, the formwork, the longitudinal distribution beam 30, the first main beam 13, and the second main beam 15 are removed from the support member 11. Subsequently, workers on the first construction platform 81 and the second construction platform 82 remove the tie rod 117 connecting the bottom bracket 111 and the bottom bracket 111 from the thin-walled pier 200. Then, workers on the first construction platform 81, the third construction platform 83, and the fourth construction platform 84 remove the tie rod 117 connecting the top bracket 113, the top bracket 113, and the triangular bracket 115 from the thin-walled pier 200.

[0049] When the beams and slabs of a cantilever cast-in-place formwork bridge are cast in place, the removed first main crossbeam 13 and second main crossbeam 15 are used as crossbeams of the cantilever cast-in-place formwork. When constructing the cast-in-place section of the side span, the bottom corbel 111, the top corbel 113, and the triangular bracket 115 are used as supports for the cast-in-place construction of the side span. Please refer to [the relevant documentation / reference]. Figure 8During construction, the bottom bracket 111 and the top bracket 113 are respectively set on opposite sides of the pier 300 and connected together by tie rods 117. The top of the bottom bracket 111 and the top bracket 113 are both equipped with triangular brackets 115. A pad 119 is sandwiched between the bottom of the triangular bracket 115 and the bottom bracket 111 or the top bracket 113. The tops of the triangular brackets 115 on both sides of the pier are connected together by tie rods 117. Then, a dropping device can be set on the top surface of the triangular bracket 115 and the distribution beam and formwork can be laid before concrete pouring.

[0050] The aforementioned cast-in-place bracket 100 for the No. 0 block of the double-limb thin-walled pier has a split design for its bottom corbel 111, top corbel 113, and triangular bracket 115. The bottom corbel 111, top corbel 113, and triangular bracket 115 can be combined in various ways to obtain cast-in-place brackets with different structures, making them suitable for cast-in-place construction of the No. 0 block and the side span cast-in-place section. At the same time, the first main beam 13 and the second main beam 15 adopt a double-splitting I-beam structure. The I-beams are connected by welding steel plates to give them sufficient strength. In addition, the two I-beams 16 are spaced apart, and the two adjacent steel plates 17 are spaced apart, thus forming a clearance opening 18 between the two adjacent steel plates 17 and the two I-beams 16 for the hanging basket hoist (not shown in the figure) to pass through, so that it can be used as a crossbeam of the cantilever cast-in-place hanging basket, thereby effectively improving the material utilization rate of the bracket components and reducing construction costs.

[0051] During the installation of the aforementioned cast-in-place bracket 100 for the No. 0 block of the double-limb thin-walled pier, the first construction platform 81, the second construction platform 82, the third construction platform 83, and the fourth construction platform 84 are first installed using the hydraulic climbing formwork platform. After the construction of the double-limb thin-walled pier 200 is completed and the hydraulic climbing formwork is removed, the remaining parts of the cast-in-place bracket 100 for the No. 0 block of the double-limb thin-walled pier are then installed on the first construction platform 81, the second construction platform 82, the third construction platform 83, and the fourth construction platform 84. The placement of the first construction platform 81, the second construction platform 82, the third construction platform 83, and the fourth construction platform 84 will not interfere with the main body of the climbing formwork platform. Since there are conflicts between the components, the first construction platform 81, the second construction platform 82, the third construction platform 83, and the fourth construction platform 84 can be installed on the climbing formwork operation platform to ensure construction safety. After that, the installed first construction platform 81, the second construction platform 82, the third construction platform 83, and the fourth construction platform 84 can be used to install the brackets, triangular brackets 115, etc. The setting of the first construction platform 81, the second construction platform 82, the third construction platform 83, and the fourth construction platform 84 can meet the auxiliary operation needs of personnel during the installation of brackets, triangular brackets 115, etc., ensure the safety of personnel working at height, and effectively reduce safety risks.

[0052] The cast-in-place bracket 100 for the No. 0 block of the aforementioned double-limb thin-walled pier has its first construction platform 81, second construction platform 82, third construction platform 83 and fourth construction platform 84 mechanically connected by pre-embedded connectors 90, including pre-embedded threaded steel bars 91, connecting sleeves 92 and connecting threaded steel bars 93. This solves the problem of installing the bracket without cutting the pier column formwork, effectively ensuring the quality of the formwork and improving the formwork turnover rate.

[0053] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. A cast-in-place bracket for a double-limb thin-walled pier block 0, comprising two bracket assemblies respectively installed on the double-limb thin-walled pier and several longitudinal distribution beams, characterized in that: The bracket assembly includes support members, a first main crossbeam, and a second main crossbeam. The bracket assembly includes multiple support members spaced apart along the transverse direction of the bridge. Each support member includes a bottom bracket, a top bracket, and a triangular bracket. The bottom bracket is located on the outer side of the corresponding thin-walled pier facing away from another thin-walled pier. The top bracket is installed on the inner side of the corresponding thin-walled pier facing another thin-walled pier. One end of both the bottom and top brackets is inserted into a pre-embedded box within the corresponding thin-walled pier. The bottom bracket is mounted on the corresponding thin-walled pier via tie rods. The bottom of the triangular bracket is supported by the bottom bracket, and a pad is sandwiched between the bottom of the triangular bracket and the bottom bracket. The top of the triangular bracket is connected to the top bracket via tie rods; both the top surfaces of the triangular bracket and the top bracket are equipped with unloading devices; the first main crossbeam is laid on the unloading devices of several triangular brackets; the second main crossbeam is placed on the unloading devices of several top brackets; both the first and second main crossbeams include two parallel and spaced I-beams, which are welded together by several steel plates, which are spaced along the length of the I-beams, and an clearance opening is formed between adjacent steel plates and the two I-beams for the hanging basket to pass through; the longitudinal distribution beam is laid on the first and second main crossbeams.

2. The cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier as described in claim 1, characterized in that: The cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier also includes a first construction platform, a second construction platform, a third construction platform, and a fourth construction platform connected to the corresponding thin-walled pier. The first construction platform is located at the bottom corbel, the second construction platform is located opposite to the first construction platform, the third construction platform is located between the tops of two adjacent triangular brackets, and the fourth construction platform is located at the top corbel.

3. The cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier as described in claim 2, characterized in that: The first construction platform, the second construction platform, the third construction platform, and the fourth construction platform are all connected to the corresponding thin-walled piers via pre-embedded connectors. The pre-embedded connectors include pre-embedded threaded steel bars, connecting sleeves, and connecting threaded steel bars. The pre-embedded threaded steel bars and the connecting sleeves are all pre-embedded in the corresponding thin-walled piers. One end of the pre-embedded threaded steel bar is threadedly connected to one end of the connecting sleeve; one end of the connecting threaded steel bar is threadedly connected to the other end of the connecting sleeve. The first construction platform, the second construction platform, the third construction platform, and the fourth construction platform are fixedly connected to the other end of the corresponding connecting threaded steel bar.

4. The cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier as described in claim 5, characterized in that: The tie rod includes a screw section and two nuts. The screw section is fitted with a sleeve pre-embedded in the corresponding thin-walled block. The two nuts are respectively threaded to the end of the screw section located outside the thin-walled block. The bottom bracket is provided with a first tie hole. The end of the screw section connected to the bottom bracket passes through the first tie hole, and the two nuts respectively abut against the outer surfaces of the bottom bracket and the thin-walled block.

5. The cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier as described in claim 4, characterized in that: The top bracket is provided with a second pair of pull holes, and the top of the triangular bracket is provided with a connecting hole; one end of the pull screw connected to the top bracket passes through the second pair of pull holes, and the other end passes through the connecting hole, and the two nuts respectively abut against the top bracket and the triangular bracket.

6. The cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier as described in claim 1, characterized in that: There are two first main crossbeams, which are arranged in parallel and spaced apart.

7. The cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier as described in claim 1, characterized in that: The longitudinal distribution beam includes two sets of flange plate longitudinal distribution beams and an inner box bottom longitudinal distribution beam. The two sets of flange plate longitudinal distribution beams are arranged at intervals relative to each other. Each flange plate longitudinal distribution beam is supported on the first main crossbeam and the second main crossbeam of the two bracket assemblies. The inner box bottom longitudinal distribution beam is laid on the second main crossbeam of the two bracket assemblies and is located between the two sets of flange plate longitudinal distribution beams.

8. The cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier as described in claim 7, characterized in that: Each of the bracket assemblies includes a chamfered construction truss supported on the first main crossbeam corresponding to the bracket assembly and disposed between the two sets of longitudinal distribution beams of the flange plates.

9. A method for installing the cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier as described in claim 3, characterized in that, Includes the following steps: When constructing a double-limb thin-walled pier using hydraulic climbing formwork, the pre-embedded connecting parts of the first construction platform, the second construction platform, the third construction platform, and the fourth construction platform are pre-embedded, so that one end of the pre-embedded threaded steel is connected to the reinforcing steel in the thin-walled pier, and the other end of the pre-embedded threaded steel is threadedly connected to one end of the connecting sleeve. After the construction of the double-limb thin-walled pier is completed, one end of the connecting threaded steel is threaded into the other end of the connecting sleeve on the hydraulic climbing formwork construction platform. Then, the first construction platform, the second construction platform, the third construction platform and the fourth construction platform are fixedly connected to the corresponding connecting threaded steel. Finally, the hydraulic climbing formwork is removed. The bottom brackets are installed on the first construction platform and the second construction platform, and the bottom brackets are fixed to the double-limb thin-walled piers by tie rods; The top bracket and triangular bracket are installed on the first construction platform, the third construction platform and the fourth construction platform, so that the bottom of the triangular bracket is supported on the bottom bracket, a pad is sandwiched between the bottom of the triangular bracket and the bottom bracket, and the top of the triangular bracket is connected to the top bracket through a tie rod. A dismounting device is installed on the top surface of the triangular bracket and the top corbel. A first main crossbeam and a second main crossbeam are laid on the dismounting device, and then a longitudinal distribution beam is laid on the first main crossbeam and the second main crossbeam.

10. A method for using a cast-in-place bracket for a double-limb thin-walled pier block No. 0, characterized in that, Includes the following steps: Provide a cast-in-place bracket for the No. 0 block of the double-limb thin-walled pier as described in claim 1, and lay a formwork on the longitudinal distribution beam to pour concrete to form the No. 0 block of the double-limb thin-walled pier; The first main beam, the second main beam, the longitudinal distribution beam, and the template are moved downwards by the unloading device for demolding, and then the bracket assembly is removed from the double-limb thin-walled pier. When using a cantilever cast-in-place formwork for the cast-in-place construction of bridge beams and slabs, the removed first and second main crossbeams are used as crossbeams of the cantilever cast-in-place formwork. When constructing the cast-in-place section of the side span, the bottom corbel, the top corbel, and the triangular bracket are used as construction supports for the cast-in-place section of the side span. During construction, the bottom corbel and the top corbel are respectively located on opposite sides of the pier and connected together by tie rods. The top of the bottom corbel and the top corbel are each equipped with a triangular bracket. A pad is sandwiched between the bottom of the triangular bracket and the bottom corbel or the top corbel. The tops of the triangular brackets on both sides of the pier are connected together by tie rods.

Images