Arch springing connecting structure of steel tube arch bridge

Abstract

The utility model discloses a steel tube arch bridge arch springing connecting structure which comprises a pre-embedded steel plate, one side of the pre-embedded steel plate is fixedly connected with an anchoring steel bar, the other side of the pre-embedded steel plate is fixedly connected with two double clamping plates, lug plates are connected between the two double clamping plates through pin shaft connecting pieces, and a supporting plate is vertically and fixedly connected between the two lug plates. Chord members are fixedly connected to the sides, deviating from the double clamping plates, of the supporting plates, and the two sides of the chord members abut against the inner walls of the lug plates correspondingly. By arranging the double clamping plates and the lug plates, the connection reliability of the arch feet is remarkably improved, the bearing energy dissipation structure is additionally arranged, damage and destruction of the structure after a strong earthquake are concentrated on the groove plate and the fixing plate, joint failure is avoided, and the purposes that the joint is easy to assemble, controllable in plasticity and replaceable are achieved; the problems that in the prior art, assembly type structure joints and connection are poor in structural integrity and complex in stress are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering and relates to an arch foot connection structure of a steel pipe arch bridge. Background Art

[0002] In terms of the seismic performance of prefabricated nodes and connections, most adopt the basic principle of "equal strength assembly instead of cast-in-place", and some use different materials and different structural connection forms to optimize the seismic performance of prefabricated structures. However, prefabricated structural nodes and connections still have problems such as uncontrollable plastic development, poor structural integrity, and complex force. It is necessary to develop a new type of high-performance prefabricated frame node and connection with simple structure, easy assembly, controllable plasticity, and replaceable to meet the target requirements of higher seismic performance. Utility Model Content

[0003] The utility model aims to provide a steel tube arch bridge arch foot connection structure, which solves the problems of poor structural integrity and complex force in the assembled structure nodes and connections in the prior art.

[0004] The technical solution adopted by the utility model is that the arch foot connection structure of the steel tube arch bridge includes an embedded steel plate, one side of the embedded steel plate is fixedly connected with an anchor steel bar, the other side of the embedded steel plate is fixedly connected with two double plywoods, the two double plywoods are connected with ear plates through a pin connecting piece, a support plate is vertically fixedly connected between the two ear plates, a chord is fixedly connected to the side of the support plate away from the double plywood, and the two sides of the chord are respectively abutted against the inner wall of the ear plate.

[0005] The utility model is characterized in that:

[0006] The corresponding two side edges of the embedded steel plate and the support plate are fixedly connected with the bearing and energy dissipation structure.

[0007] The load-bearing energy dissipation metal plate includes a slot plate fixedly connected to the side of the embedded steel plate. The slot plate is a C-shaped structure. A sliding slot is arranged in the slot plate opening. A fixed plate is rotatably connected in the sliding slot. The side of the fixed plate away from the embedded steel plate is fixedly connected to the side of the support plate.

[0008] A weakening hole is provided on the fixing plate, and the weakening hole is in an elliptical or diamond shape.

[0009] The anchor steel bar has a C-shaped structure as a whole, and the open end of the anchor steel bar is bent back inward.

[0010] The double plywood comprises two plywoods of the same size, both of which are fixedly connected to the side walls of the embedded steel plate, and the distance between the two plywoods is greater than the thickness of the ear plate.

[0011] The beneficial effects of the utility model are:

[0012] The utility model significantly improves the reliability of the connection at the arch foot by arranging double plywood and ear plates, and adds a load-bearing and energy-dissipating structure. The damage and destruction of the structure after a strong earthquake are concentrated on the groove plate and the fixed plate, thus avoiding node failure, achieving easy assembly, controllable plasticity and replaceability of the node, and solving the problems of poor structural integrity and complex force in the prefabricated structure nodes and connections in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the arch foot connection structure of the steel tube arch bridge of the utility model;

[0014] Figure 2 It is a schematic diagram of the connection structure of the double plywood and the ear plate in the arch foot connection structure of the steel tube arch bridge of the utility model;

[0015] Figure 3 It is a structural schematic diagram of the arch seat embedded device in the arch foot connection structure of the steel tube arch bridge of the utility model;

[0016] Figure 4a This is a structural schematic diagram of a circular hole in a fixed plate in the arch foot connection structure of a steel tube arch bridge of the utility model;

[0017] Figure 4b This is a structural schematic diagram of a fixed plate with diamond-shaped holes in the arch foot connection structure of a steel tube arch bridge of the utility model;

[0018] Figure 5 It is a structural schematic diagram of the load-bearing energy dissipation structure in the arch foot connection structure of the steel tube arch bridge of the utility model;

[0019] Figure 6 This is a diagram showing the use status of the arch foot connection structure of the steel tube arch bridge of the utility model;

[0020] In the figure, 1. arch seat embedded device, 101. embedded steel plate, 102. anchor steel bar, 2. load-bearing and energy dissipation structure, 201. groove plate, 202. fixed plate, 3. double plywood, 4. ear plate, 5. pin connector, 6. chord, 7. pass steel plate, 8. arch seat, 9. support plate. DETAILED DESCRIPTION

[0021] The utility model is further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Example 1

[0023] like Figure 1 , Figure 2 and Figure 6As shown, the arch foot connection structure of the steel tube arch bridge disclosed in the utility model includes a pre-embedded steel plate 101 with a thickness of 25mm, and an anchoring steel bar 102 is fixedly connected to one side of the pre-embedded steel plate 101. The anchoring steel bar 102 is welded to the surface of the pre-embedded steel plate 101 by double-sided welding and cast together with the arch seat concrete. Two double plywoods 3 are fixedly connected to the other side of the pre-embedded steel plate 101, and bolt holes are reserved in advance. The spacing between the double plywoods is controlled according to the thickness of the ear plate 4 used. The ear plate 4 is connected between the two double plywoods 3 through a pin connection 5. The ear plate 4 penetrates into the gap of the double plywood 3, and the ear plate 4 and the double plywood 3 are fixed by the pin connection 5. The ear plate 4 can rotate around the pin and slide laterally. In the utility model, the double plywood 3, the ear plate 4 and the pin connection 5 form a steel hinge, and a 2mm gap is left between the ear plate 4 and the double plywood 3 to release the lateral displacement at the steel hinge. A certain amplitude of translation and rotation is performed relative to the pin connection 5. A support plate 9 is vertically fixed between the two ear plates 4, and a chord 6 is fixed to the side of the support plate 9 facing away from the double plywood 3, and the two sides of the chord 6 are respectively in contact with the inner wall of the ear plate 4. The chord 6 is axially close to the support plate 9, and the two sides are welded to the side of the ear plate 4 to form a reliable whole with the ear plate 4. Before use, the overall force calculation should be carried out according to the scale of the bridge, and the reasonable size of the double plywood 3 and the ear plate 4 should be selected according to the calculation results. The pin connector 5 is installed in the pin hole of the anchor ear plate 4. The outer edge of the bushing is tightly matched with the pin hole of the ear plate 4, and no displacement can occur between them. The inner edge pins are required to be able to rotate flexibly.

[0024] In the specific implementation of the utility model, the arch seat embedded device 1 is cast and constructed synchronously with the arch seat 8, the double plywood 3 is welded to the exposed surface of the embedded device, the double plywood 3 and the ear plate 4 are detachable steel hinges, and the ear plate 4 can rotate around the pin. The pass steel plate 7 is fixed to the arch bridge chord 6 with self-tapping screws. The width of the pass steel plate 7 is determined by the width of the bridge deck and the thickness is 12mm. The utility model is applied to the connection between the arch foot of the steel pipe arch bridge and the concrete arch seat, which effectively reduces the influence of temperature on the arch foot, significantly improves the reliability of the connection at the arch foot, and can be replaced at any time.

[0025] Example 2

[0026] like Figure 4a , Figure 4b and Figure 5 As shown, on the basis of Example 1, the corresponding two side edges of the embedded steel plate 101 and the support plate 9 are fixedly connected with the bearing and energy dissipation structure 2.

[0027] The load-bearing and energy-dissipating structure 2 is located at the upper and lower flanges of the steel hinge, ensuring that the arch foot connection structure of the steel tube arch bridge can not only realize the load transfer between nodes, but also realize the controllable plastic energy dissipation and failure mode. The load-bearing and energy-dissipating structure 2 bears the tensile or compressive axial force, and the pin connection 5 bears the shear force.

[0028] Furthermore, the load-bearing energy dissipation structure 2 includes a slot plate 201 fixedly connected to the side of the embedded steel plate 101. The slot plate 201 is a C-shaped structure. A sliding slot is provided in the opening of the slot plate 201. A fixed plate 202 is rotatably connected in the sliding slot. The side of the fixed plate 202 away from the embedded steel plate 101 is fixedly connected to the side of the support plate 9.

[0029] In the specific implementation process, a linear sliding groove can be set inside the groove plate 201, and a spherical slider is set in the sliding groove. Any point of the spherical slider is fixedly connected to the fixed plate 202, so that the fixed plate 202 can move linearly along the sliding groove and its rotation performance can be guaranteed.

[0030] Furthermore, a weakening hole is opened on the fixing plate 202, and the weakening hole is elliptical or diamond-shaped. The structure of the steel hinge is optimized by using two different weakening forms, elliptical opening and diamond opening.

[0031] Example 3

[0032] like Figure 3 As shown, based on Example 1, the anchoring steel bar 102 is in a C-shaped structure as a whole, and the open end of the anchoring steel bar 102 is bent inward.

[0033] The utility model is not limited to setting the anchoring steel bar 102 as a C-shaped structure as a whole. The open end of the anchoring steel bar 102 is bent back inward. As long as the anchoring steel bar 102 is processed into a hook shape at the tail to improve its anchoring performance, any structure is acceptable.

[0034] Furthermore, the double plywood 3 includes two plywoods of the same size, both of which are fixedly connected to the side wall of the embedded steel plate 101 , and the distance between the two plywoods is greater than the thickness of the ear plate 4 .

[0035] The specific implementation process of the utility model is:

[0036] First, the bridge arch seat 8 is constructed. After the reinforcement of the arch seat 8 is tied, the arch seat embedded device 1 is made. The embedded steel plate 101 and the anchoring steel bar 102 are welded by double-sided welding. The arch seat embedded device 1 and the arch seat reinforcement are tied and fixed, and the arch seat concrete is poured. Next, the steel hinge is installed, and the double plywood 3 prefabricated in the factory is welded to both sides of the embedded steel plate 101. The thickness of the ear plate 4 reserved between the double plywood 3 and the gap on both sides are 2mm each. Insert the ear plate 4 and fix it with the pin connector 5 to complete the installation of the steel hinge.

[0037] The energy dissipation structure 2 is installed. The fixing plate (202) 2 in the energy dissipation structure 2 has two types, an elliptical opening and a diamond opening. The fixing plate (202) is fixedly connected to the side of the support plate (9). The slot plate (201) in the energy dissipation structure 2 is welded to the embedded steel plate (101). The chord rod 6 is installed. The prefabricated chord rod 6 is inserted into the steel hinge. The contact surfaces of the two sides of the chord rod 6 and the ear plate 4 are ground flat and tightened and welded using arc welding.

[0038] Finally, the pass steel plate 7 is installed. The width of the pass steel plate 7 depends on the width of the bridge deck. One side of the pass steel plate 7 is overlapped on the top surface of the arch seat 8, and one side is fixed to the chord 6 with self-tapping screws. The gap between the pass steel plate 7 and the chord 6 is filled with a rubber water stop.

Claims

1. The arch foot connection structure of the steel tube arch bridge is characterized by: The invention comprises an embedded steel plate (101), one side of the embedded steel plate (101) is fixedly connected to an anchor steel bar (102), the other side of the embedded steel plate (101) is fixedly connected to two double plywood plates (3), the two double plywood plates (3) are connected to an ear plate (4) via a pin connecting piece (5), a support plate (9) is vertically fixedly connected between the two ear plates (4), a chord rod (6) is fixedly connected to the side of the support plate (9) facing away from the double plywood plates (3), and the two sides of the chord rod (6) are respectively in contact with the inner wall of the ear plate (4).

2. The steel tube arch bridge arch foot connection structure according to claim 1, characterized in that: The corresponding two side edges of the embedded steel plate (101) and the support plate (9) are both fixedly connected with a bearing and energy dissipation structure (2).

3. The steel tube arch bridge arch foot connection structure according to claim 2, characterized in that: The load-bearing energy dissipation structure (2) comprises a slot plate (201) fixedly connected to the side of the embedded steel plate (101), the slot plate (201) being a C-shaped structure, a sliding slot being provided in an opening of the slot plate (201), a fixing plate (202) being rotatably connected in the sliding slot, and a side of the fixing plate (202) away from the embedded steel plate (101) being fixedly connected to the side of the support plate (9).

4. The steel tube arch bridge arch foot connection structure according to claim 3, characterized in that: The fixing plate (202) is provided with a weakening hole, and the weakening hole is in an elliptical or diamond shape.

5. The steel tube arch bridge arch foot connection structure according to claim 1, characterized in that: The anchoring steel bar (102) is in a C-shaped structure as a whole, and the open end of the anchoring steel bar (102) is bent back inwards.

6. The steel tube arch bridge arch foot connection structure according to claim 1, characterized in that: The double clamping plate (3) comprises two clamping plates of the same size, both clamping plates are fixedly connected to the side wall of the embedded steel plate (101), and the distance between the two clamping plates is greater than the thickness of the ear plate (4).

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