Simply supported beam bridge anti-seismic device

Abstract

The utility model belongs to the technical field of bridge construction, and particularly relates to a simply supported beam bridge anti-seismic device which comprises an anti-seismic pin seat, an anti-seismic pin rod, a sleeve, a nut, a compression spring, a base plate and an outer fixing cover. The sleeve is fixed in the anti-seismic pin seat in a penetrating manner; the anti-seismic pin rod is arranged in the sleeve in a penetrating mode, nuts are arranged at the two ends of the anti-seismic pin rod for fixing, a base plate is arranged between one end of the anti-seismic pin rod and the nut and the sleeve, and a compression spring and a base plate are arranged between the other end of the anti-seismic pin rod and the nut and the sleeve. Outer fixing covers are arranged at the outer ends of the nuts at the two ends of the anti-vibration pin rod. According to the anti-seismic device, the independent simply supported beams, the abutment cover beam bridge and the like are connected into a whole, meanwhile, the influence of seismic waves is reduced through the compression springs, and the anti-seismic performance of the bridge is comprehensively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, in particular to an anti-seismic device for a simply supported beam bridge. Background Art

[0002] Due to the isolation effect of piers, supports, etc., there are few examples of bridge superstructures being directly damaged by inertia forces during earthquakes. The main form of bridge structure damage is superstructure damage caused by damage to the lower structure. Common forms of lower structure damage are as follows: ① The displacement of the pier causes the longitudinal displacement of the bridge span to exceed the support length due to the small reserved shelf length of the beam, resulting in beam fall damage; ② The support is damaged due to insufficient shear bearing capacity under the action of an earthquake, resulting in beam fall; ③ Improper reinforcement design and insufficient bearing capacity cause damage to the node; ④ Pier column failure causes beam fall damage, etc.

[0003] Simply supported beam bridges usually use prefabricated beams for lifting and are placed directly on rubber bearings above the cap beams. They have poor integrity. Once the lower structure is displaced by an earthquake, accidents such as falling beams can easily occur. In order to solve the problem of poor seismic resistance of simply supported beam bridges, it is urgent to design a new type of simply supported beam seismic device to weaken the impact of seismic waves on simply supported beams and improve the seismic performance of simply supported beam bridges. Utility Model Content

[0004] The purpose of the utility model is to provide a seismic device for a simply supported beam bridge, which connects each independent simply supported beam with a pier cap beam, abutment, etc. to form a whole, and at the same time reduces the influence of seismic waves by compressing springs to comprehensively improve the seismic performance of the bridge.

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

[0006] A seismic device for a simply supported beam bridge, the seismic device comprising a seismic pin seat, a seismic pin rod, a sleeve, a nut, a compression spring, a pad and an external fixing cover;

[0007] The anti-seismic pin seat is arranged on the pier cap beam or the bridge abutment, and the sleeve is passed through and fixed in the anti-seismic pin seat; the anti-seismic pin rod is passed through the sleeve, and nuts are set at both ends of the anti-seismic pin rod for fixing, a pad is set between the nut and the sleeve at one end, and a compression spring and a pad are set between the nut and the sleeve at the other end of the anti-seismic pin rod;

[0008] External fixing covers are arranged at the outer ends of the nuts at both ends of the anti-seismic pin rod.

[0009] Preferably, threads are provided on the portion other than the anti-vibration pin rod sleeved with the sleeve.

[0010] Preferably, the end of the anti-vibration pin rod, the nut, the backing plate and the outer fixing cover are fixed by welding.

[0011] Preferably, the compression spring is a cold-wound helical compression spring.

[0012] Preferably, the cold-rolled helical compression spring is made of a steel wire with a diameter ≥ 2 mm, the inner diameter of the cold-rolled helical compression spring is ≥ 60 mm, and the free length is 100 mm.

[0013] Preferably, the anti-seismic device further comprises a rubber sheet, which is arranged at the connection position between the anti-seismic pin seat and the prefabricated beam. The rubber sheet may be a chloroprene rubber sheet.

[0014] The utility model is suitable for simply supported beams and utilizes the spring recovery effect of the simple anti-seismic pin seat structure to reduce the impact of seismic waves, improve its anti-seismic ability, and ensure the stability of the simply supported beam bridge during an earthquake. It has a simple structure and significant effect.

[0015] The beneficial effect of the utility model patent is: to provide a simply supported beam seismic resistant device with simple structure, reasonable design and convenient construction. The simple structure can improve the seismic resistance of the bridge, the construction is convenient and the construction cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural plan view of the utility model's anti-seismic pin seat at the bridge pier;

[0017] Figure 2 yes Figure 1 A-A section diagram;

[0018] Figure 3 It is a structural plan view of the utility model anti-seismic pin seat at the abutment;

[0019] Figure 4 yes Figure 3 B-B section of

[0020] Figure 5 It is a structural schematic diagram of the utility model anti-seismic device;

[0021] Figure 6 It is a structural diagram of the anti-seismic pin seat of the utility model;

[0022] Reference numerals:

[0023] 1. Earthquake-resistant pin seat; 2. Earthquake-resistant pin rod; 3. Casing; 4. Nut; 5. Compression spring; 6. Pad; 7. External fixing cover; 8. Pier cap beam; 9. Abutment; 10. Precast beam; 11. Rubber sheet. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0025] Example 1

[0026] like Figure 5 As shown, a seismic device for a simply supported beam bridge comprises a seismic pin seat 1, a seismic pin rod 2, a sleeve 3, a nut 4, a compression spring 5, a pad 6 and an outer fixing cover 7;

[0027] like Figure 1-4 As shown, the seismic pin seat 1 is arranged on the pier cap beam 8 or the abutment 9, and the sleeve 3 is passed through and fixed in the seismic pin seat 1; the seismic pin rod 2 is passed through the sleeve 3, and nuts 4 are set at both ends of the seismic pin rod 2 for fixing, and a pad 6 is set between the nut 4 and the sleeve 3 at one end, and a compression spring 5 and a pad 6 are set between the nut 4 and the sleeve 3 at the other end of the seismic pin rod 2; the size of the pad can be 200mm long, 200mm wide and 10mm thick.

[0028] An outer fixing cover 7 is arranged at the outer ends of the nuts 4 at both ends of the anti-seismic pin rod 2. The outer fixing cover can be made of a bent steel bar of φ12.

[0029] The anti-seismic pin rod 2 sleeved with the sleeve 3 is provided with threads. The anti-seismic pin rod is provided with threads at the part connected with the nut, and other parts may not be provided with threads.

[0030] The end of the anti-vibration pin rod 2, the nut 4, the backing plate 6 and the outer fixing cover 7 are fixed by welding (which may be a peripheral spot welding method).

[0031] The compression spring 5 is a cold-wound helical compression spring.

[0032] The cold-rolled helical compression spring is made of a steel wire with a diameter of ≥2 mm, the inner diameter of the cold-rolled helical compression spring is ≥60 mm, and the free length is 100 mm.

[0033] The anti-seismic device further comprises a chloroprene rubber sheet 11 (the size may be 600 mm in height, 600 mm in width and 25 mm in thickness), and the chloroprene rubber sheet 11 is arranged at the connection position between the anti-seismic pin seat 1 and the prefabricated beam 10 .

[0034] The prefabricated beam is a T-shaped beam. The steel parts of the utility model, such as the anti-seismic pin rod, the compression spring, the pad, etc., are coated with anti-rust paint.

[0035] Figure 1-2 This is the structural plan of the seismic pin seat at the bridge pier. The seismic pin seat is set in the middle of the center line of the two beam ribs, with a spacing of one support spacing. The casing adopts a pre-buried steel pipe. The casing adopts a three-section arrangement, namely, the prefabricated beam part on both sides and the seismic pin seat part.

[0036] Figure 3-4It is a structural plan view of the utility model of the anti-seismic pin seat at the abutment. The anti-seismic pin seat is arranged in the middle of the center lines of the two beam ribs, with a spacing of one support spacing. The casing adopts a pre-buried steel pipe, and the casing adopts a two-section arrangement, that is, it is divided into a prefabricated beam part on one side and an anti-seismic pin seat part;

[0037] Figure 5 It is a structural schematic diagram of the utility model anti-seismic device;

[0038] Figure 6 It is a structural diagram of the anti-seismic pin seat of the utility model;

[0039] Taking the connection between the T-beam, the pier cap beam and the abutment as an example, the implementation of the seismic device of the utility model is described:

[0040] 1. The anti-seismic device of the utility model is composed of an anti-seismic pin seat and an anti-seismic pin rod, etc., which are arranged at the cast-in-place end cross beam of the simply supported beam, and one set is arranged between every two beams. The concrete grade of the anti-seismic pin seat is consistent with the concrete grade of the cap beam below. When the anti-seismic pin seat of the bridge cap beam is constructed, a sleeve is pre-buried, and the sleeve is a D60 steel pipe with a thickness of 2mm.

[0041] 2. The chloroprene rubber sheet and the anti-seismic pin seat are bonded together with epoxy resin. The thickness of the chloroprene rubber sheet is 25mm, the plane size is consistent with the anti-seismic pin seat, and a D60 small hole is reserved.

[0042] 3. After the prefabricated beams are hoisted, the T-beams are cast-in-place with wet joints. D60 steel pipes are embedded during pouring, and the center of the steel pipe is aligned with the center of the sleeve of the seismic pin seat.

[0043] 4. The steel pipes are installed in the concrete seismic pin seats and the cast-in-place wet joints of the T-beams. They are buried in three sections at the piers and in two sections at the abutments. The centers of the steel pipes are aligned.

[0044] 5. Compression springs are only set on the front side of abutments at bridge abutments, and can be set on any side of piers.

[0045] 6. After the anti-seismic pin rod, pad and nut are in place, weld the pin rod end, pad and nut into one piece, and at the same time, set an external fixing cover on the outside of the nut and weld it.

[0046] In actual construction, when the utility model selects prefabricated beams, a group of ribs can be designed at the end of the prefabricated beams, steel sleeves are reserved on the ribs, and the prefabricated beams and the seismic pin seats are connected through seismic pin rods, thereby improving the assembly function of the seismic pin seats and making the installation operation simpler and more convenient. The seismic resistant structure of the utility model can also be applied to expansion joint structures.

[0047] Any content not described in detail in the present invention can be based on the conventional technical knowledge in the field.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the embodiments, a person skilled in the art should understand that any modification or equivalent replacement of the technical solution of the utility model does not deviate from the spirit and scope of the technical solution of the utility model, and should be included in the scope of the claims of the utility model.

Claims

1. A seismic device for a simply supported beam bridge, characterized in that: The anti-seismic device comprises an anti-seismic pin seat, an anti-seismic pin rod, a sleeve, a nut, a compression spring, a pad and an external fixing cover; The sleeve is inserted and fixed in the anti-seismic pin seat; the anti-seismic pin rod is inserted in the sleeve, and nuts are arranged at both ends of the anti-seismic pin rod for fixing, a pad is arranged between the nut and the sleeve at one end, and a compression spring and a pad are arranged between the nut and the sleeve at the other end of the anti-seismic pin rod; External fixing covers are arranged at the outer ends of the nuts at both ends of the anti-seismic pin rod.

2. The seismic device for a simply supported beam bridge according to claim 1, characterized in that: The portion other than the anti-seismic pin rod sleeved with the casing is provided with threads.

3. The seismic device for a simply supported beam bridge according to claim 1, characterized in that: The end of the anti-vibration pin rod, the nut, the pad and the outer fixing cover are fixed by welding.

4. The seismic device for a simply supported beam bridge according to claim 1, characterized in that: The compression spring is a cold-wound helical compression spring.

5. The seismic resistant device for a simply supported beam bridge according to claim 4, characterized in that: The cold-rolled helical compression spring is made of a steel wire with a diameter of ≥2 mm, the inner diameter of the cold-rolled helical compression spring is ≥60 mm, and the free length is 100 mm.

6. The seismic resistant device for a simply supported beam bridge according to any one of claims 1 to 5, characterized in that: The anti-seismic device also includes a rubber sheet, which is arranged at the connection position between the anti-seismic pin seat and the prefabricated beam.

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