Permanent and temporary combined steel-concrete composite beam cast-in-place bridge floor flange plate cantilever formwork support system

Abstract

The utility model relates to a permanent and temporary combined steel-concrete composite beam cast-in-place bridge floor flange plate cantilever formwork support system which comprises a plurality of steel cantilever beam assemblies arranged at the top of a steel box beam at equal intervals in the longitudinal bridge direction, and each steel cantilever beam assembly comprises two symmetrical steel cantilever beams. Steel formworks are welded to the bottoms of the steel cantilever beams on the same side, and the inner sides of the steel formworks are welded to the outer sides of the jacking steel plates. The steel cantilever beam comprises a top plate, a web, a suspender, bolts, stiffening ribs and cushion blocks, the inner side of the bottom of the web is welded to the jacking steel plate, the outer side of the bottom of the web extends out of the jacking steel plate, the outer side of the bottom of the web is connected with the suspender, the bottom of the suspender is welded to the steel formwork, and the stiffening ribs are welded between the two sides of the web and the jacking steel plate; the cushion block is welded to the end, close to the center line of the steel box girder, of the top of the top plate. The device is high in practicability, simple in structure, convenient to install, high in working efficiency and low in cost, belongs to a permanent and temporary combined structure, and does not need to be dismounted later.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a cantilever formwork support system for a permanent and temporary combined steel-concrete composite beam cast-in-place bridge deck flange plate. Background Art

[0002] With the accelerated urbanization process and the rapid development of transportation infrastructure, steel-concrete composite beam bridges have been widely used in bridge engineering as a superior structural method that meets the needs of large-span cross-over projects. However, in the existing construction practice, the cast-in-place construction of steel-concrete composite beam bridge decks faces many challenges and difficulties.

[0003] In the existing steel-concrete composite beam bridge deck flange cantilever support construction, common forms include traditional scaffolding full-height support, beam-column support, triangular cantilever support formed by welding of steel sections, and cantilever beam hanger structure. However, these structures have certain limitations and defects, such as occupying space under the bridge, large welding volume, difficulty in removing the support, complex construction operation, low construction efficiency, and more manpower and material resources and construction period, which restrict the development of modern bridge construction. Utility Model Content

[0004] The utility model aims to solve the deficiencies of the prior art and to more efficiently, safely and economically perform cast-in-place construction of bridge deck flanges, thereby providing a permanent and temporary combined steel-concrete composite beam cast-in-place bridge deck flange plate cantilever formwork support system.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] The permanent and temporary steel-concrete composite beam cast-in-place bridge deck flange plate cantilever formwork support system includes a number of steel cantilever beam assemblies equidistantly arranged on the top of the steel box beam along the longitudinal bridge direction, each steel cantilever beam assembly includes two steel cantilever beams and the two steel cantilever beams are symmetrically arranged on the top supporting steel plates on both sides of the top of the steel box beam web plate, and a steel formwork is welded to the bottom of the steel cantilever beams on the same side and the inner side of the steel formwork is welded to the outer side of the top supporting steel plate;

[0007] The steel cantilever beam includes a top plate, a web plate, hangers, bolts, stiffening ribs and pads. The top of the web plate is welded to the bottom of the top plate, and the outer ends of the top plate and the web plate are welded to the inner wall of the steel formwork. The inner side of the bottom of the web plate is welded to the top supporting steel plate, and the outer side of the bottom of the web plate extends out of the top supporting steel plate. The outer side of the bottom of the web plate is connected to a number of hangers by bolts, and the bottom of the hanger is welded to the steel formwork. The stiffening ribs are welded between the two sides of the web plate and the top supporting steel plate. The pad is welded to one end of the top of the top plate close to the center line of the steel box girder, and the top of the pad is welded to the transverse reinforcement of the bridge deck.

[0008] A number of holes are provided in the middle and bottom of the web.

[0009] The cross-sections of the top plate and the web are in a T-shaped structure.

[0010] The number of suspension rods is 1 - 2.

[0011] The suspension rods are arranged in the gaps between the longitudinal steel bars at the bottom layer of the bridge deck.

[0012] Several steel cantilever beams on the same side are arranged in the middle of the shear stud gaps on the top bearing steel plate.

[0013] The beneficial effects of the present utility model are as follows: The present utility model has strong practicability, simple structure, convenient installation, high working efficiency and low cost; by transferring the load of the cast-in-place bridge deck flange part to the steel beam body, the problems of inconvenient erection of full hall scaffolds at the operation site and the large workload of scaffold processing, difficult installation and removal operations are solved; it belongs to a permanent-temporary combined structure and does not need to be demolished later. Description of the Drawings

[0014] Figure 1 It is a schematic installation cross-section view of the present utility model;

[0015] Figure 2 It is a schematic installation plan view of the present utility model;

[0016] Figure 3 It is a schematic enlarged view of the partial structure of the present utility model;

[0017] In the figure: 1 - steel cantilever beam; 2 - steel formwork; 3 - steel box girder; 4 - bridge deck;

[0018] 101 - top plate; 102 - web; 103 - suspension rod; 104 - bolt; 105 - stiffening rib; 106 - cushion block; 107 - hole;

[0019] 301 - top bearing steel plate; 302 - shear stud; 303 - steel box girder web;

[0020] 401 - transverse steel bar; 402 - longitudinal steel bar;

[0021] The following will be described in detail with reference to the embodiments of the present utility model with reference to the drawings. Specific Embodiments

[0022] The principles and features of the present utility model will be described below with reference to the drawings. The examples given are only used to explain the present utility model and are not used to limit the scope of the present utility model. In the following paragraphs, the present utility model will be described more specifically by way of example with reference to the drawings. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model.

[0023] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there can be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used herein in the specification of this utility model are for the purpose of describing specific embodiments only and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0025] The following further describes this utility model in conjunction with the drawings and embodiments:

[0026] As Figures 1 to 3 shown, the cast-in-place deck slab flange cantilever formwork support system of the permanent-temporary combined steel-concrete composite beam is a steel structure system, including a number of steel cantilever beam components arranged at equal intervals along the longitudinal bridge direction on the top of the steel box girder 3. Each steel cantilever beam component includes two steel cantilever beams 1, and the two steel cantilever beams 1 are symmetrically arranged on the top bearing steel plates 301 on both sides of the top of the web 303 of the steel box girder. A steel formwork 2 is welded to the bottom of several steel cantilever beams 1 on the same side, and the inner side of the steel formwork 2 is welded to the outside of the top bearing steel plate 301.

[0027] A number of steel cantilever beam components are arranged at a certain interval along the longitudinal bridge direction. The two steel cantilever beams 1 of the steel cantilever beam component are symmetrically arranged about the beam center line. The interval distance along the longitudinal bridge direction needs to be determined through force analysis. Several steel cantilever beams 1 on the same side are arranged in the middle of the gaps of the shear studs 302 on the top bearing steel plate 301.

[0028] The steel cantilever beam 1 is integrally disposed in the internal area of the steel bar framework of the bridge deck 4, including a top plate 101, a web 102, a suspender 103, a bolt 104, a stiffening rib 105, a spacer 106, and a hole 107.

[0029] The top of the web 102 is welded to the bottom of the top plate 101, and the outer ends of the top plate 101 and the web 102 are both welded to the inner wall of the steel formwork 2.

[0030] The inner side of the bottom of the web 102 is welded to the top bearing steel plate 301, and the outer side of the bottom of the web 102 extends out of the top bearing steel plate 301. The cross sections of the top plate 101 and the web 102 are in a T-shaped structure.

[0031] The web 102 is approximately in the shape of an inverted trapezoid as a whole, and a plurality of holes 107 are provided in the middle and bottom of the web 102 for the longitudinal reinforcement 402 of the bridge deck 4 to pass through and for the flow of concrete during pouring.

[0032] The outer side of the bottom of the web 102 is connected to a plurality of hangers 103 by bolts 104, and the bottom of the hangers 103 is welded to the steel formwork 2. The hangers 103 can be made of steel plates, angle steels or channel steels, and the number of hangers 103 set for each steel cantilever beam 1 is 1-2. The hangers 103 are set in the gaps of the bottom longitudinal steel bars 402 of the bridge deck 4 to avoid conflict with the bridge deck steel bars.

[0033] The stiffening ribs 105 are welded between the two sides of the web 102 and the top supporting steel plate 301 to strengthen the location of the web 102 where the internal force is the largest.

[0034] The pad 106 is welded to one end of the top plate 101 near the center line of the steel box girder 3, and the top of the pad 106 is welded to the transverse reinforcement 401 of the bridge deck 4, and the transverse reinforcement 401 is used to achieve the tension of the steel cantilever beams 1 on both sides of the bridge.

[0035] The steel formwork 2 is made of steel plate, the thickness of which needs to be determined through force calculation, and the shape of the steel formwork 2 needs to fit the lower side and end of the flange of the bridge deck 4.

[0036] The utility model has the characteristics of strong practicality, simple structure, easy installation, high work efficiency and low cost. By transferring the load of the 4 flange parts of the cast-in-place bridge deck to the steel beam body, the problem of inconvenience in setting up scaffolding and full-hall supports at the work site is solved, the problem of large workload in support processing is solved, and the problem of difficulty in installing and removing the support is solved.

[0037] The utility model is a permanent and temporary combination, and does not need to be dismantled later. After the bridge deck concrete is poured, the steel cantilever beam 1 and the bridge deck 4 become one, which can improve the bridge deck flange bearing capacity and reduce the reinforcement amount of the bridge deck 4.

[0038] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. The permanent and temporary combined steel-concrete composite beam cast-in-place bridge deck flange plate cantilever formwork support system is characterized by: It comprises a plurality of steel cantilever beam assemblies arranged equidistantly on the top of a steel box beam (3) along the longitudinal bridge direction, each steel cantilever beam assembly comprises two steel cantilever beams (1), and the two steel cantilever beams (1) are symmetrically arranged on the top supporting steel plates (301) on both sides of the top of the steel box beam web (303), and a steel template (2) is welded to the bottom of the plurality of steel cantilever beams (1) on the same side, and the inner side of the steel template (2) is welded to the outer side of the top supporting steel plate (301); The steel cantilever beam (1) comprises a top plate (101), a web plate (102), a hanger rod (103), bolts (104), a stiffening rib (105) and a pad (106); the top of the web plate (102) is welded to the bottom of the top plate (101); the outer ends of the top plate (101) and the web plate (102) are welded to the inner wall of the steel formwork (2); the inner side of the bottom of the web plate (102) is welded to the top supporting steel plate (301); the outer side of the bottom of the web plate (102) extends out of the top supporting steel plate (301), the outer side of the bottom of the web (102) is connected to a plurality of hangers (103) by bolts (104), the bottom of the hanger (103) is welded to the steel formwork (2), the stiffening ribs (105) are welded between the two sides of the web (102) and the top supporting steel plate (301), the pad (106) is welded to one end of the top of the top plate (101) close to the center line of the steel box girder (3), and the top of the pad (106) is welded to the transverse reinforcement (401) of the bridge deck (4).

2. The permanent and temporary combined steel-concrete composite beam cast-in-place bridge deck flange plate cantilever formwork support system according to claim 1 is characterized in that: A plurality of holes (107) are provided in the middle and bottom of the web (102).

3. The permanent and temporary combined steel-concrete composite beam cast-in-place bridge deck flange plate cantilever formwork support system according to claim 2 is characterized in that: The cross-sections of the top plate (101) and the web plate (102) are T-shaped structures.

4. The permanent and temporary combined steel-concrete composite beam cast-in-place bridge deck flange plate cantilever formwork support system according to claim 3 is characterized in that: The number of the suspension rods (103) is 1-2.

5. The permanent and temporary combined steel-concrete composite beam cast-in-place bridge deck flange plate cantilever formwork support system according to claim 4 is characterized in that: The suspension rod (103) is arranged in the gap between the longitudinal steel bars (402) of the bottom layer of the bridge deck (4).

6. The permanent and temporary combined steel-concrete composite beam cast-in-place bridge deck flange plate cantilever formwork support system according to claim 5 is characterized in that: A plurality of steel cantilever beams (1) on the same side are arranged in the middle of the gap between the shear nails (302) on the top supporting steel plate (301).

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