Temporary combined support suitable for vertical curve steel truss girder construction

Abstract

The utility model provides a temporary combined support suitable for construction of a vertical curve steel truss girder, which comprises two temporary combined support bodies and a prestress opposite-pulling structure, and the two temporary combined support bodies are symmetrically arranged on the periphery of a pier column of a permanent pier of the vertical curve steel truss girder; the pier column is connected with the two temporary combined support bodies through a prestress opposite-pulling structure. The two temporary combined support bodies are arranged on the large mileage side and the small mileage side of a pier column respectively. Each temporary combined support body comprises an inclined supporting structure, and the inclined supporting structures are arranged on the periphery of a pier column. Transverse impact force generated in the pushing process of the steel truss girder is resisted through the prestress opposite-pull structure, the bearing capacity of the pushing inclined supporting structure is improved, and stable installation of a pier-side support is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a temporary combined bracket suitable for the construction of vertical curved steel trusses. Background Art

[0002] In today's bridge projects, steel trusses have become a common structural form of the superstructure of large-span bridges. In order to adapt to the complex construction environment, they are mainly constructed by the jacking method. In the construction of steel truss jacking, most of them adopt the walking sliding jacking method, that is, the steel truss is erected above the walking machine, the steel truss is supported by the slider, the steel truss is lifted by the vertical jack, and then the vertical jack is pushed by the horizontal jack to move the steel truss, and then the vertical jack is reset, and the horizontal jack is reset, and the above steps are repeated to complete the movement of the steel truss.

[0003] During the steel truss jacking construction process, considering that the steel truss has a small cross-section and the lower chord cannot bear concentrated loads, the traditional jacking temporary combined bracket cannot ensure that the nodes of the steel truss bear concentrated loads, that is, the point of force of the slider supporting the steel truss can only be located at the node of the steel truss. At the same time, when the crawler pushes the steel truss horizontally, the position of the slider in the jacking temporary combined bracket is different, and the load on the pier is different, that is, the bending moment caused by the deadweight of the steel truss on the pier will change dynamically. If the traditional jacking temporary combined bracket is used, considering that the longitudinal bending resistance of the pier is often poor, this complex dynamic load will cause the pier to accumulate elastic deformation and damage during the jacking process. In addition, when there is a steel truss with a designed vertical curve during the jacking construction, the bottom elevation of the steel truss needs to be continuously adjusted during the process to avoid forced strain during the jacking process of the steel truss.

[0004] For the jacking construction of steel trusses with vertical curves, the temporary combined support used for the piers is the key. First, it must ensure that the force of the structure is reasonable during the jacking process, and it must also be able to easily adjust the bottom elevation of the steel trusses. Therefore, the traditional jacking temporary combined support does not meet the above requirements. Summary of the invention

[0005] The utility model aims to provide a temporary combined support suitable for the construction of vertical curved steel trusses, which solves the problem in the prior art that the temporary combined support used in the jacking construction of steel trusses will cause the piers to be damaged by cumulative elastic deformation during the jacking process.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The utility model provides a temporary combined support suitable for the construction of vertical curved steel truss beams, comprising two temporary combined support bodies and a prestressed tension structure, wherein the two temporary combined support bodies are symmetrically arranged at the periphery of the pier column of the permanent pier of the vertical curved steel truss beam; the pier column is connected to the two temporary combined support bodies through the prestressed tension structure; the two temporary combined support bodies are respectively arranged at the large mileage side and the small mileage side of the pier column;

[0008] Each temporary combined support body comprises an oblique support structure, wherein the oblique support structure is arranged on the periphery of the pier.

[0009] Preferably, the oblique support structure comprises two steel pipe columns, wherein the two steel pipe columns are symmetrically arranged on a cap on which the pier is installed, with the axis of the pier as the center;

[0010] A pile head is provided on the top of each steel pipe column, and each pile head is fixedly connected to the pier column through a prestressed tension structure.

[0011] Preferably, the two steel pipe columns are fixedly connected via a first transverse connection system;

[0012] The side of each steel pipe column is fixedly connected to the pier column through a longitudinal connection system;

[0013] Each steel pipe column is arranged outwardly along the axis of the pier from the base.

[0014] Preferably, the side walls of the two pile heads are fixedly connected via a second transverse connection system; and the tops of the two pile heads are connected via a distribution beam.

[0015] Preferably, the prestressed tension structure comprises prestressed tendons, wherein:

[0016] There are two prestressed tendons, which are arranged in parallel and pass through the top of the pier column;

[0017] Both ends of each prestressed tendon are respectively fixedly connected to pile heads arranged on the side of the pier with a small mileage and the side of the pier with a large mileage.

[0018] Preferably, the top of the oblique support structure and the pier column is provided with a walking jacking system; the walking jacking system comprises a slideway beam, a walking machine, a cushion block, a sliding block and a pad block, wherein:

[0019] The middle position of the slideway beam is clamped on the top of the pier column;

[0020] Both ends of the slideway beam are fixedly connected to the oblique support structure;

[0021] Both ends of the slideway beam slideway are provided with walker placing platforms, and the walker is fixed on the walker placing platforms;

[0022] A cushion block is arranged directly above each walker, and the cushion block is installed on the slideway beam;

[0023] A slider is also slidably mounted on the slideway beam, and the slider is placed between the two walkers;

[0024] The cushion block and the sliding block are both provided with cushion blocks.

[0025] Preferably, friction plates are provided on the contact surfaces between the cushion block and the shoveling cushion block, between the slider and the shoveling cushion block, and between the cushion block and the vertical jack of the crawler;

[0026] The contact surfaces between the cushion block and the slideway beam and between the slider and the slideway beam are all smeared with butter.

[0027] Preferably, the large and small mileage sides of the pier are respectively provided with connecting parts, the lower part of the connecting part is fixedly connected to the pier through the embedded parts of the slideway beam support point, and the upper end of the connecting part is connected to the bottom of the slideway beam to form an integrated structure.

[0028] Preferably, it also includes a working platform, which includes a manual operation platform and a gas station platform, wherein the manual operation platform is arranged along the four sides of the slideway beam; and the gas station platform is installed on the outer side of the steel truss beam.

[0029] Compared with the prior art, the beneficial effects of the utility model are:

[0030] The utility model provides a temporary combined support suitable for the construction of vertical curved steel trusses. The oblique support structure is used to cope with the horizontal thrust generated by the jacking of the steel trusses, and the prestressed tension structure is used to resist the lateral impact force generated during the jacking of the steel trusses, thereby improving the bearing capacity of the jacking oblique support structure and facilitating the stable installation of the support beside the pier.

[0031] Furthermore, by setting up a working platform around the slideway beam and setting height-variable pads in the walking jacking system, the need for continuous adjustment of the pier top elevation of the vertical curved steel truss during the jacking process is met. This is safe and reliable, easy to operate manually, and can effectively ensure jacking efficiency and construction accuracy.

[0032] Furthermore, by applying butter on the slideway beam and setting a friction plate, it is ensured that the friction between the pad block and the lower chord of the steel truss is greater than the friction between the slider and the slideway, and the pad block and the slideway. This ensures that the point of force of the slider supporting the steel truss is always located at the node of the steel truss during the jacking process, thereby ensuring the smooth progress of the jacking. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a diagram of the use state of the utility model;

[0034] Figure 2It is a front view of the utility model;

[0035] Figure 3 It is a side view of the utility model;

[0036] Figure 4 This is a schematic diagram of the step push system;

[0037] Among them, 1-cap, 2-pier, 3-oblique support structure, 4-walker jacking system, 5-working platform, 6-steel pipe column, 7-longitudinal connection system, 8-first transverse connection system, 9-second transverse connection system, 10-steel pipe column embedded parts, 11-connection system pier body attached embedded parts, 12-prestressed tendons, 13-longitudinal hollow steel pipe, 14-prestressed tendon embedded parts, 15-pile head, 16-prestressed tendon anchor, 17-distribution beam, 18-slideway beam, 19-walker, 20-pad, 21-slider, 22-pad, 23-slideway beam support point embedded parts, 24-walker placement platform, 25-friction plate. DETAILED DESCRIPTION

[0038] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0039] Example 1

[0040] like Figure 1 As shown, this embodiment provides a temporary combined support suitable for the construction of vertical curved steel trusses, including two temporary combined support bodies and a prestressed tension structure, and the two temporary combined support bodies are symmetrically arranged on the periphery of the permanent pier column 2.

[0041] The pier column 2 is connected to two temporary combined support bodies through a prestressed tension structure.

[0042] The two temporary combined support bodies are arranged on the large mileage side and the small mileage side of the pier 2 respectively.

[0043] Each temporary combined support body includes an oblique support structure 3, wherein the oblique support structure 3 is arranged at the periphery of the pier 2, and a walking jacking system 4 and a working platform 5 are arranged on the top of the oblique support structure 3 and the pier 2.

[0044] Example 2

[0045] like Figures 1 to 3As shown, based on Example 1, this embodiment provides a temporary combined support suitable for the construction of vertical curved steel trusses, wherein the oblique support structure 3 includes a steel pipe column 6, a longitudinal connection system 7 and a first transverse connection system 8, wherein:

[0046] There are two steel pipe columns 6 , both of which are arranged on the cap 1 and are symmetrically arranged with the axis of the pier 2 as the center.

[0047] The two steel pipe columns are fixedly connected via a first transverse connection system 8; in this embodiment, each pair of steel pipe columns is connected to the transverse connection system by welding.

[0048] The bottom of each steel pipe column 6 is fixedly connected to the cap 1 via a steel pipe column embedded part 10 .

[0049] Each steel pipe column gradually inclines outward from the base 1 along the pier body direction of the pier column 2, and the inclination angles through the steel pipe column 6 are consistent.

[0050] Each steel pipe column is fixedly connected to the pier 2 via a longitudinal connection system 7 .

[0051] Each longitudinal connection system 7 and the pier column 2 are fixedly connected via the connection system pier body attachment embedded parts 11 .

[0052] Example 3

[0053] like Figures 1 to 3 As shown, based on Example 2, this embodiment provides a temporary combined bracket suitable for the construction of vertical curved steel trusses, wherein the prestressed tension structure includes prestressed tendons 12 and longitudinal hollow steel pipes 13, wherein:

[0054] The two prestressed tendons 12 are provided, and the two prestressed tendons 12 are embedded in parallel at the top of the pier column, and the two ends of each prestressed tendon 12 are respectively connected to the two temporary combined bracket bodies.

[0055] A pile head 15 is disposed on the top of each steel pipe column, and a prestressed tendon anchor 16 is disposed on a side of the pile head 15 away from the pier column 2 .

[0056] Both ends of each prestressed tendon 12 are respectively fixedly connected to prestressed tendon anchors 16 arranged on the side of the pier with a small mileage and the side of the pier with a large mileage.

[0057] A longitudinal hollow steel pipe 13 is mounted on each of the prestressed tendons between the pier column and the prestressed tendon anchor 16 .

[0058] One end of the longitudinal hollow steel pipe 13 is fixedly connected to the pier 2 via a prestressed tendon embedded part 14 ; the other end of the transverse hollow steel pipe 13 is fixedly connected via a pile head 15 .

[0059] The side walls of the two pile heads 15 of each temporary combined support are fixedly connected by a second transverse connection system 9 .

[0060] The tops of the two pile heads 15 of each temporary combined support are connected by a distribution beam 17, and the distribution beam 17 is fixedly connected to the pile heads 15 by welding.

[0061] Example 4

[0062] like Figures 1 to 4 As shown, based on Example 1, this embodiment provides a temporary combined support suitable for the construction of vertical curved steel trusses, wherein the walking jacking system includes a slide beam 18, a walking machine 19, a cushion block 20, a slider 21 and a pad block 22, wherein:

[0063] The slideway beam 18 is clamped on the top of the pier column 2 along the pushing direction.

[0064] The large and small mileage sides of the pier 2 are respectively provided with connecting parts, and the lower part of the connecting part is fixedly connected to the pier 2 through the embedded parts 23 of the slide beam support points. The upper end of the connecting part is connected to the bottom of the slide beam 18 to form an integrated structure to disperse the longitudinal concentrated force during the jacking process.

[0065] Both ends of the slideway beam 18 are respectively connected to the two distribution beams 17 by welding.

[0066] A crawler placement platform 24 is provided at both ends of the slideway of the slideway beam 18 , and the crawler 19 is fixedly connected to the slideway of the slideway beam 18 via the crawler placement platform 24 .

[0067] A cushion block 20 is arranged directly above each walker 19 , and the cushion block 20 is installed on the slideway beam 18 .

[0068] The contact surface between the cushion block 20 and the vertical jack of the walker 19 is provided with a friction plate 25 .

[0069] The contact surface between the cushion block 20 and the slideway beam is smeared with butter.

[0070] A slider 21 is also installed on the slideway beam 16, and the slider 21 is placed between the two walkers.

[0071] The contact surface between the slider 21 and the slideway beam is smeared with butter.

[0072] The cushion block 20 and the sliding block 21 are both provided with a cushion block 22 .

[0073] Friction plates 25 are provided on the contact surfaces between the cushion block 20 and the cushion block 22 and between the slider 21 and the cushion block 22 .

[0074] The height of the cushion block 22 is variable.

[0075] Example 6

[0076] Based on Example 1, this example provides a temporary combined support suitable for the construction of vertical curved steel trusses, wherein the working platform 5 includes a manual operation platform and a gas station platform, wherein the manual operation platform is arranged along the four sides of the slideway beam; and the gas station platform is installed on the outside of the steel truss.

[0077] Example 7

[0078] The present embodiment provides a method for using a temporary combined support for the construction of a vertical curved steel truss beam, comprising the following steps:

[0079] 1. Installation of bracket beside pier

[0080] Pier side bracket construction process: install steel pipe column embedded parts on the top of the pedestal → install steel pipe column → install connection system → install pile head and tension the prestress between pier body and steel pipe column → install distribution beam and slideway beam → install walking jacking system → install manual operation platform

[0081] (1) The embedded parts of the pier bracket include four types: steel pipe column embedded parts 10, connection pier body attached embedded parts 11, slideway beam support point embedded parts 23, and prestressed tendon embedded parts 14. Among them, the steel pipe column embedded parts 10 must be completed before the pouring of the pedestal 1, the connection pier body attached embedded parts 11 and the slideway beam support point embedded parts 23 must be completed before the pouring of the pier column 2. The embedded parts must be accurately positioned according to the design drawings.

[0082] (2) Steel pipe columns, pier-column connections, pile heads, distribution beams, and slideway beams are all installed using crawler cranes.

[0083] (3) The prestress between the pier column and the steel pipe column needs to be tensioned after the pile head is installed and before the distribution beam is installed.

[0084] (4) Install the manual operation platform and the oil station platform. The oil station platform is installed on the outside of the steel truss.

[0085] 2-step installation and commissioning of the push system

[0086] (1) According to the requirements of pushing, select a walker of corresponding specifications, and install its structural force requirements. Install the walker placement platform and the walker at both ends of the slide beam. The walker placement platform and the slide beam are fixedly connected by welding, and the walker and the placement platform are fixedly connected by welding; install the pad on the slide beam directly above the vertical jack of the walker. Among them, the horizontal pushing of the walker is achieved by setting a friction plate between the pad and the contact surface of the vertical jack of the walker for friction connection, and applying butter between the pad and the contact surface of the slide beam for sliding connection.

[0087] (2) Before the formal push, debug the walking machine equipment by first jogging and then linkage to ensure the coordination and synchronization of the walking machine push system.

[0088] 3 Pushing process

[0089] (1) Before pushing, install the slider on the slideway just below the steel truss node; apply butter between the slider and the slideway; set a friction plate between the slideway and the steel truss to establish a friction connection. Ensure that the slider is always at the steel truss node during the pushing process to achieve horizontal pushing of the crawler.

[0090] (2) First, lift the machine. Set the crawler to the lifting mode and use high pressure control, i.e. 63Mpa (the value can be set according to the structural parameters of the steel truss and the actual situation on site). When the pressure is greater than 63Mpa, the oil station hardware overflow valve begins to overflow. The control system synchronously controls the extension of the vertical jack cylinders of each crawler to lift the steel truss to the predetermined elevation. After lifting, the crawler simultaneously releases pressure, and the vertical piston retracts to the bottom of the beam to be emptied. The weight of the steel beam is borne entirely by the slider.

[0091] (3) Then start pushing and set the crawler to push mode. The medium pressure control is used, that is, the maximum working pressure is 31.5Mpa (the value can be set according to the steel truss structure parameters and the actual situation on site), and the oil station hardware overflow valve is greater than 31.5Mpa overflow. The horizontal jack extension cylinders of each crawler are synchronously controlled by the control system. The friction between the crawler and the bottom of the steel truss is used to push the steel truss forward. At the same time, the slider follows the steel truss forward in linkage.

[0092] After a stroke of jacking is completed, the vertical jack of the crawler machine slowly retracts the cylinder, and the main body of the steel truss falls on the slider. After the horizontal jack of the crawler machine retracts the cylinder and returns to the initial position, the next jacking cycle can be entered.

[0093] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A temporary combined support suitable for the construction of vertical curved steel trusses, characterized in that: It includes two temporary combined support bodies and a prestressed tension structure. The two temporary combined support bodies are symmetrically arranged on the periphery of the pier column of the permanent pier of the vertical curved steel truss beam; the pier column is connected to the two temporary combined support bodies through the prestressed tension structure; the two temporary combined support bodies are respectively arranged on the large mileage side and the small mileage side of the pier column; Each temporary combined support body comprises an oblique support structure, wherein the oblique support structure is arranged on the periphery of the pier.

2. A temporary combined support for the construction of vertical curved steel trusses according to claim 1, characterized in that: The oblique support structure includes two steel pipe columns, wherein the two steel pipe columns are symmetrically arranged on a cap on which the pier is installed, with the axis of the pier as the center; A pile head is provided on the top of each steel pipe column, and each pile head is fixedly connected to the pier column through a prestressed tension structure.

3. A temporary combined support for the construction of vertical curved steel trusses according to claim 2, characterized in that: The two steel pipe columns are fixedly connected by a first transverse connection system; The side of each steel pipe column is fixedly connected to the pier column through a longitudinal connection system; Each steel pipe column is arranged outwardly along the axis of the pier from the base.

4. A temporary combined support for the construction of vertical curved steel trusses according to claim 2, characterized in that: The side walls of the two pile heads are fixedly connected via a second transverse connection system; the tops of the two pile heads are connected via a distribution beam.

5. A temporary combined support for the construction of vertical curved steel trusses according to claim 2, characterized in that: The prestressed tension structure includes prestressed tendons, wherein: There are two prestressed tendons, which are arranged in parallel and pass through the top of the pier column; Both ends of each prestressed tendon are respectively fixedly connected to pile heads arranged on the side of the pier with a small mileage and the side of the pier with a large mileage.

6. A temporary combined support for the construction of vertical curved steel trusses according to claim 1, characterized in that: The top of the oblique support structure and the pier column is provided with a walking jacking system; the walking jacking system includes a slideway beam, a walking machine, a cushion block, a sliding block and a pad block, wherein: The middle position of the slideway beam is clamped on the top of the pier column; Both ends of the slideway beam are fixedly connected to the oblique support structure; Both ends of the slideway beam slideway are provided with walker placing platforms, and the walker is fixed on the walker placing platforms; A cushion block is arranged directly above each walker, and the cushion block is installed on the slideway beam; A slider is also slidably mounted on the slideway beam, and the slider is placed between the two walkers; The cushion block and the sliding block are both provided with cushion blocks.

7. A temporary combined support for the construction of vertical curved steel trusses according to claim 6, characterized in that: Friction plates are arranged on the contact surfaces between the cushion blocks and the shoveling cushion blocks, between the slider and the shoveling cushion blocks, and between the cushion blocks and the vertical jack of the crawler; The contact surfaces between the cushion block and the slideway beam and between the slider and the slideway beam are all smeared with butter.

8. A temporary combined support for the construction of vertical curved steel trusses according to claim 6, characterized in that: The large and small mileage sides of the pier are respectively provided with connecting pieces, the lower part of the connecting piece is fixedly connected to the pier through the embedded parts of the slideway beam support points, and the upper end of the connecting piece is connected to the bottom of the slideway beam to form an integrated structure.

9. A temporary combined support for the construction of vertical curved steel trusses according to claim 6, characterized in that: It also includes a working platform, which includes a manual operation platform and a gas station platform, wherein the manual operation platform is arranged along the four sides of the slideway beam; and the gas station platform is installed on the outer side of the steel truss beam.

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