Temporary buttress structure of special-shaped steel structure overbridge

Abstract

The utility model relates to the technical field of steel box girder construction, in particular to a temporary buttress structure of a special-shaped steel structure overbridge. Comprising a plurality of sets of temporary buttress frame bodies, each temporary buttress frame body comprises a reinforced concrete strip-shaped foundation, two parallel spiral welding pipes are pre-buried and fixed in each reinforced concrete strip-shaped foundation, and a cable-stayed steel pipe is arranged and fixed between the two spiral welding pipes; the tops of the spiral welding pipes are fixedly connected with a horizontal steel cross beam, and two load adjusting structures corresponding to the two spiral welding pipes up and down are arranged on the horizontal steel cross beam. According to the scheme, the temporary buttress structure is designed for the temporary support of the heavy steel box bridge, the structural support is stable, the vertical temporary support height of each support point of a certain steel box girder is adjustable, and the structural support is stable. Under the clamping of the working platform, the construction is convenient, the operation is safe, and the device has practical value and is worthy of similar engineering reference.

Description

Technical Field

[0001] The utility model relates to the technical field of steel box girder construction, in particular to a temporary pier structure of a special-shaped steel structure overpass. Background Art

[0002] The common steel structure bridges currently have a horizontal deck design. As people's aesthetic standards have been further improved, some special structures are often needed in some special occasions to enhance the overall aesthetics. For common horizontal steel structure bridges, they often use more conventional scaffolding as temporary support, and the structure is evenly stressed. However, for complex bridge structures, their temporary support requires special design.

[0003] For example, the pedestrian bridge under construction this time has a main bridge length of 170.62 meters and a branch line length of 65.32 meters. The main beam is made of steel structure, and the piers and pile foundations are reinforced concrete structures. The main beam is 4.0 meters wide and 1.5 meters high, with a maximum span of 28 meters, in a Ruyi shape. Its construction difficulty is extremely huge. As a temporary support structure, conventional ordinary supports cannot meet the support requirements of steel box beams, so it is necessary to conduct deeper research and discussion on this issue. Utility Model Content

[0004] The utility model aims to provide a temporary pier structure of a special-shaped steel structure overpass to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a temporary pier structure of a special-shaped steel structure overpass, comprising a plurality of temporary pier frames, wherein two adjacent temporary pier frames are welded or bolted together and fixed by horizontally connecting steel beams;

[0006] Each group of temporary pier frames includes a reinforced concrete strip foundation, in which two parallel spiral welded pipes are embedded and fixed, and the two spiral welded pipes are both vertically arranged; a diagonal steel pipe is fixed between the two spiral welded pipes, and the two spiral welded pipes and the diagonal steel pipes form a triangular structure; a horizontal steel beam is fixedly connected to the tops of the two spiral welded pipes, and two load adjustment structures are arranged on the horizontal steel beam corresponding to the upper and lower parts of the two spiral welded pipes respectively.

[0007] Each of the load adjustment structures includes a first square tube, a second square tube and a jack. The lower end of the first square tube is welded or bolted to a horizontal steel beam, and the longitudinal center line of the first square tube is coaxial with the rotation center axis of the corresponding spiral welded pipes above and below; the second square tube is slidably mounted on the first square tube, and a horizontal load-bearing steel plate is welded to the top of the second square tube; the base of the jack is placed on the horizontal steel beam, and the plunger of the jack is abutted against the horizontal load-bearing steel plate above and below, and the second square tube is slid upward along the longitudinal center line of the first square tube by applying pressure through the jack.

[0008] Further: an operating hole is opened in the first square tube near the horizontal steel beam, the jack is located inside the first square tube, the rotation axis of the jack's plunger is coaxially arranged with the longitudinal center line of the first square tube, and the pressure and pressure relief operations of the jack are realized through the operating hole.

[0009] Further: The diameter of the spiral welded pipe is The wall thickness is 6mm, and the horizontal steel beam is H500*500 hot-rolled steel.

[0010] Further: a hook is fixed on the outer wall of the spiral welded pipe close to the horizontal steel beam, and a plumb bob is hung on the hook to judge whether the spiral welded pipe is installed vertically.

[0011] Further: it also includes a working platform, which includes a number of steel strips welded together at intervals in the vertical and horizontal directions, and both ends of the steel strips are fixedly connected to the horizontal connecting steel beams; the working platform also includes a template laid on the steel strips and a combined frame-type safety ladder cage.

[0012] The beneficial effect of the utility model is that the utility model designs and develops a plurality of groups of temporary pier frames, which are connected by horizontally connecting steel beams according to construction requirements and the control points of the steel box bridge to form an overall temporary support that meets the requirements of supporting the steel box bridge.

[0013] Each temporary pier frame is composed of a reinforced concrete strip foundation, spiral welded pipes and horizontal steel beams to form a hand structure that can bear the load of the steel box bridge, and is stabilized by forming a scissor brace through the inclined steel pipe and the spiral welded pipe. For the temporary pier frame, there are also two load adjustment structures, each of which is designed to slide up and down through a first square through rectangular tube and a second square through rectangular tube in the adjustment mechanism to vertically support the hoisted steel box girder. The sliding height of the second square through rectangular tube relative to the first square through rectangular tube is adjusted by a jack to adapt to the hoisting position of the steel box bridge, so that the temporary support height can be adjusted.

[0014] Therefore, the temporary pier structure designed for the temporary support of heavy steel box bridges in this scheme not only has a stable structural support, but also realizes that the vertical temporary support height of each support point of a certain steel box beam can be adjusted, and the structural support is stable. With the support of the working platform, it is convenient for construction and safe operation, and its specific practical value is worthy of reference for similar projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the installation structure of a single set of temporary pier frames in the utility model.

[0016] Figure 2 It is a schematic diagram of the overall implementation structure of the temporary pier structure in the utility model. DETAILED DESCRIPTION

[0017] In the figure: reinforced concrete strip foundation 1, spiral welded pipe 2, inclined steel pipe 3, horizontal steel beam 4, first square through rectangular tube 7, second square through rectangular tube 5, horizontal load-bearing steel plate 6, jack 8, working platform 9, steel plate strip 9a, combined frame type safety ladder cage 9b, horizontal connecting steel beam 10.

[0018] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1 and Figure 2 The utility model provides a technical solution: the site of the new pedestrian bridge is located in the city center, the rock and soil are stable, no faults, landslides, dangerous rocks, collapses, mudslides and other adverse geological phenomena are found, and no goaf, karst, ground fissures, ground subsidence, harmful gases and other adverse geological effects are found. According to the actual situation on site, in order to ensure that the segments can be safely and stably in place, according to the segmentation of the beam pieces, a total of 3 sets of temporary pier frames are set up on site to support the steel beams.

[0020] like Figure 1 As shown: Each set of temporary pier frames includes a reinforced concrete strip foundation 1, and the reinforced concrete grade is C30. Two parallel spiral welded pipes 2 are embedded and fixed in the reinforced concrete strip foundation 1, and the two spiral welded pipes 2 are both vertically arranged. The outer diameter of the spiral welded pipe 2 is The wall thickness is 6 mm. The horizontal center distance between the two spiral welded pipes 2 is preset to 3 m. The length of the spiral welded pipe 2 is fixed to 5.5 m.

[0021] An inclined steel pipe 3 is fixed between the two spiral welded pipes 2, and the two spiral welded pipes 2 and the inclined steel pipe 3 form a triangular structure, that is, a scissor brace structure. A horizontal steel beam 4 is fixedly connected to the top of the two spiral welded pipes 2, and two load adjustment structures corresponding to the upper and lower parts of the two spiral welded pipes 2 are arranged on the horizontal steel beam 4. Among them, the horizontal steel beam 4 is cut from H500*500 hot-rolled steel.

[0022] Each of the load adjustment structures includes a first square tube 7, a second square tube 5 and a jack 8. The lower end of the first square tube 7 is welded or bolted to the horizontal steel beam 4, and the longitudinal centerline of the first square tube 7 is coaxial with the rotation centerline of the corresponding spiral welded pipe 2. The second square tube 5 is slidably sleeved on the first square tube 7, and a horizontal force-bearing steel plate 6 is welded to the top of the second square tube 5. The base of the jack 8 is placed on the horizontal steel beam 4, and the plunger of the jack 8 abuts against the horizontal force-bearing steel plate 6. The second square tube 5 slides upward along the longitudinal centerline of the first square tube 7 by applying pressure through the jack 8.

[0023] As the optimal solution, to prevent the second square tube 5 from being eccentrically stressed during the up and down process, we adopt a structural form in which the jack 8 is built into the first square tube 7, and an operating hole is opened on the first square tube 7 to operate the jack 8. The jack 8 is located inside the first square tube 7, and the rotation axis of the plunger of the jack 8 is coaxially arranged with the longitudinal center line of the first square tube 7, and the pressure-in and pressure-relief operations of the jack 8 are realized through the operating hole.

[0024] In order to facilitate installation, we also fix a hook on the outer wall of the spiral welded pipe 2 near the horizontal steel beam 4, and a plumb bob is hung on the hook to determine whether the spiral welded pipe 2 is installed vertically.

[0025] like Figure 2 As shown, in order to facilitate hoisting and manual operation assistance, we have added a working platform 9 on the basis of the temporary pier structure. The specific working platform 9 is as follows: the working platform 9 includes a plurality of steel strips 9a welded together at intervals in the vertical and horizontal directions, and both ends of the steel strips 9a are fixedly connected to the horizontal connecting steel beam. The working platform 9 also includes a template laid on the steel strips 9a and a combined frame type safety ladder cage 9b. Construction personnel can safely reach the steel strips 9a of the working platform 9 through the combined frame type safety ladder cage 9b, and step on the wooden board to perform hoisting auxiliary operations to meet the requirements of safety operation specifications.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A temporary pier structure for a special-shaped steel structure overpass, characterized in that: It comprises a plurality of groups of temporary pier frames, wherein two adjacent groups of temporary pier frames are fixed by welding or bolting via a horizontal connecting steel beam (10); Each group of temporary pier frames comprises a reinforced concrete strip foundation (1), wherein two mutually parallel spiral welded pipes (2) are embedded and fixed in the reinforced concrete strip foundation (1), and the spiral welded pipes (2) are arranged vertically; an inclined steel pipe (3) is arranged and fixed between the two spiral welded pipes (2), and the spiral welded pipes (2) and the inclined steel pipes (3) form a triangular structure; a horizontal steel beam (4) is fixedly connected to the top of the spiral welded pipe (2), and two load adjustment structures corresponding to the two spiral welded pipes (2) are arranged on the horizontal steel beam (4); Each of the load adjustment structures comprises a first square tube (7), a second square tube (5) and a jack (8); the lower end of the first square tube (7) is welded or bolted to a horizontal steel beam (4), and the longitudinal center line of the first square tube (7) is coaxial with the rotation center axis of the spiral welded pipe (2) corresponding to the upper and lower parts; the second square tube (5) is slidably sleeved on the first square tube (7) in an upward and downward manner, and a horizontal load-bearing steel plate (6) is welded to the top of the second square tube (5); the base of the jack (8) is placed on the horizontal steel beam (4), and the plunger of the jack (8) is abutted against the horizontal load-bearing steel plate (6) in an upward and downward manner, and the second square tube (5) is slid upward along the longitudinal center line of the first square tube (7) by applying pressure through the jack (8).

2. The temporary pier structure of a special-shaped steel structure overpass according to claim 1 is characterized by: The first square tube (7) is provided with an operating hole near the horizontal steel beam (4); the jack (8) is located inside the first square tube (7); the rotation axis of the plunger of the jack (8) is coaxially arranged with the longitudinal center line of the first square tube (7); and the pressure-increasing and pressure-relieving operations of the jack (8) are realized through the operating hole.

3. The temporary pier structure of a special-shaped steel structure overpass according to claim 1 is characterized by: The diameter of the spiral welded pipe (2) is The wall thickness is 6 mm, and the horizontal steel beam (4) is a H500*500 hot-rolled steel.

4. The temporary pier structure of a special-shaped steel structure overpass according to claim 1 is characterized by: A hook is fixed on the outer wall of the spiral welded pipe (2) near the horizontal steel beam (4), and a plumb bob is hung on the hook, and the plumb bob is used to determine whether the spiral welded pipe (2) is installed vertically.

5. The temporary pier structure of a special-shaped steel structure overpass according to claim 1 is characterized by: The invention also comprises a working platform (9), wherein the working platform (9) comprises a plurality of steel strips (9a) welded to each other and spaced apart in the vertical and horizontal directions, wherein both ends of the steel strips (9a) are fixedly connected to the horizontal connecting steel beam (10); the working platform (9) also comprises a template laid on the steel strips (9a) and a combined frame type safety ladder cage (9b).

Images