CN106087707B - A kind of accessory configurations for preventing existing bridge lateral from toppling and its construction method - Google Patents

Abstract

The invention relates to an additional structure for preventing lateral overturning of an existing bridge and a construction method thereof, belonging to the technical field of bridge structures. The invention comprises a steel plate at the bottom of the bridge deck, a channel steel plate, a steel sleeve, a steel corbel, a steel anchor rod and a nut. At the bottom of the bridge deck along the lateral sides of the bridge, the steel plates are anchored, and the steel plates are firmly connected to the bridge deck through the upper anchors; the channel-shaped steel plates are welded to the steel plates at the bottom of the bridge deck; , with two semi-circular steel pipes connected to form a steel sleeve; the steel corbel is connected to the steel sleeve by welding; oval holes are reserved on the bottom of the trough-shaped steel plate and the steel corbel; the diameter of the steel anchor is smaller than the width of the oval hole , pass through the reserved hole vertically, screw the two ends with nuts, and leave a small gap between the lower nut and the bottom surface of the corbel. The additional structure for preventing the lateral overturning of the existing bridge of the present invention has reasonable stress, easy material acquisition, simple structure, convenient construction, and is economical and practical.

Description

An additional structure for preventing lateral overturning of existing bridges and its construction method

technical field

The invention relates to an additional structure for preventing the lateral overturning of an existing bridge, which is applied to the connecting part of a bridge deck system and a bridge pier in a bridge structure, and belongs to the field of bridge structures.

Background technique

In the construction of urban highway bridges and expressway bridges, due to the influence of terrain and ground objects, the lower piers of bridges often adopt independent columns or similar independent column support methods to reduce the occupied area and avoid layout conflicts between buildings. Although the single column pier bridge has many advantages such as simple structure and strong adaptability, the lateral stability and safety of the bridge deck system with single point support are poor, especially when the vehicle is seriously unbalanced, due to the vertical The lateral displacement is only constrained in the middle, so it is prone to vicious accidents of the overall lateral overturning of the bridge deck.

In order to improve the lateral anti-overturning capacity of the existing bridge without changing the mechanical performance and normal service state of the existing bridge, it is necessary to strengthen the local structural connection of the bridge support. The main purpose is to increase the strength of the bridge deck when it bears eccentric load Anti-overturning moment, thereby enhancing the integrity and firmness of the bridge deck structure.

Contents of the invention

The invention proposes an additional structure arranged at the position of the bridge support to prevent the lateral overturning of the existing bridge, which is used to solve the problem of the existing bridge support, especially the weak anti-overturning ability of the deck system of the single-pillar pier bridge. The additional structure for preventing the lateral overturning of the existing bridge has a clear concept of mechanics, can provide sufficient pull-out force, restrain the vertical displacement of the bridge deck system, and prevent the occurrence of overturning accidents. Changes and deformation caused by temperature effects, to avoid causing additional stress inside the bridge deck system. The additional structure is convenient for construction, does not affect the normal use of the bridge during construction, is economical and practical, and is easy to realize.

Technical scheme of the present invention is as follows:

An additional structure for preventing the lateral overturning of an existing bridge is characterized in that the structure includes steel plates at the bottom of the bridge deck, channel steel plates, steel sleeves, steel corbels, steel anchor rods and nuts; The bottom of the bridge deck is chiseled and reinforced, then concrete is poured, and anchored on both sides of the bottom of the bridge deck along the transverse direction. The steel plate is firmly connected with the bridge deck through anchors; Chiseling and planting bars at a certain height below the top, and pouring concrete after connecting two semicircular steel pipes into a steel sleeve; steel corbels are connected to the steel sleeve by welding (completed by the factory); the horizontal web of the channel steel plate Elliptical holes are reserved on the upper and lower flanges of the steel corbel; the diameter of the steel anchor is smaller than the width of the elliptical hole, passing through the reserved hole vertically, and the channel-shaped steel plate and the steel corbel are pulled together. The ends are screwed with nuts; the embedded steel plate and the channel steel plate form a hollow box-shaped structure, which can accommodate the arrangement and screwing of nuts.

The steel plate is connected to the bottom of the bridge through anchors, and the steel sleeve connected by two semicircular steel pipes is connected to the bridge pier with roughened surface and reinforced reinforcement through studs and concrete. The inner side of the steel sleeve is welded with bolts. Nail connectors to meet the force transmission requirements and ensure the reliability of the connection.

The same oval holes are reserved on the horizontal web of the channel steel plate and the upper and lower flanges of the steel corbel, and the positions of all the holes are vertically consistent. The short axis of the hole is parallel to the transverse direction of the bridge deck, allowing the steel anchor to pass through, and the long axis of the hole is parallel to the long direction of the bridge, allowing the steel anchor to slide therein.

The diameter of the steel anchor rod is smaller than the width of the oval hole, vertically passes through the reserved hole of the channel steel plate and the steel corbel, and the two ends are screwed with nuts, leaving a gap of 3 mm between the nut at the lower end and the bottom surface of the corbel ~5mm.

A construction method for additional construction to prevent lateral overturning of existing bridges, characterized in that the method comprises the following steps:

a. Anchor the steel plate at the bottom of the bridge deck along the transverse direction of the bridge;

b. Prefabricate the splicing and opening of the channel-shaped steel plate, and connect it with the steel plate by welding to form a hollow box-shaped structure;

c. Divide the steel sleeve into two semicircular steel pipes vertically, complete the prefabrication process in the factory, and weld the stud connectors inside, and the two parts that have been processed are positioned and spliced on site.

d. Chiseling and planting reinforcement in the top area of the pier, positioning and welding the steel sleeve, post-casting concrete, and fixing the steel sleeve to a certain height below the top of the pier. The height range should be determined according to the structural requirements;

e. Complete the welding and opening of the steel corbel in the factory, and complete the welding of the steel corbel and the semicircular steel sleeve;

f. Pass the steel anchor rod from bottom to top through the reserved hole of the steel corbel and the channel steel plate, and tighten it with nuts at both ends, leaving a gap of 3mm to 5mm between the nut at the lower end and the bottom surface of the steel corbel .

Compared with the prior art, the present invention has the following remarkable effects:

(1) The steel anchor rods effectively connect the bridge deck system and the corbels vertically, so that when the bridge deck system bears eccentric loads, it can generate sufficient anti-overturning moments, and avoid excessive vertical deformation of the bridge surface when it tilts to one side. (2) The steel anchor rod can slide freely along the bridge length, and will not restrain the longitudinal deformation of the bridge deck system due to concrete shrinkage and creep or temperature effects. (3) The concept of structural mechanics is clear, and it is easy to obtain the required pullout force according to the eccentric load of the vehicle, and then determine the diameter and quantity of the required steel anchor rods. The force is reasonable, the materials are easy to obtain, and the structure is simple. (4) The structure is convenient for construction, and the construction process does not affect the normal use of existing bridges, which is economical and practical, and easy to realize.

Description of drawings

Fig. 1 is the elevation view of the present invention.

Fig. 2 is a perspective view of the relative relationship between the components of the present invention.

Fig. 3 is a sectional view of A-A of Fig. 1 (not including the nut 5 and the anchor piece of the steel plate 1).

In the figure: 1—steel plate at the bottom of the deck; 2—steel plate; 3—steel sleeve; 4—steel corbel; 5—steel anchor; 6—nut; 7—existing bridge pier; 8—planted reinforcement ; 9—bolt connector; 10—post-cast concrete.

detailed description

Below in conjunction with accompanying drawing, structure of the present invention, construction process are further described as follows.

As shown in Fig. 1, the additional structure for preventing the existing bridge lateral overturning of the present invention comprises a bridge deck bottom steel plate 1, a channel steel plate 2, a steel sleeve 3, a steel corbel 4, a steel anchor rod 5 and a nut 6; wherein The steel plate 1 at the bottom of the bridge deck is cut and reinforced at the bottom of the bridge deck, then concrete is poured, anchored on both sides of the bottom of the bridge deck along the transverse direction, and firmly connected with the bridge deck through anchors; the vertical flange plate of the channel-shaped steel plate 2 It is connected with the steel plate 1 by welding to form a hollow box-shaped structure, which can accommodate the arrangement and screwing of the nut 6 inside. The steel sleeve 3 is connected by two semicircular steel pipes. After the factory prefabrication is completed, it is installed and positioned on site, wraps the top area of the pier, and is spliced by welding. The steel corbel 4 is connected to the steel sleeve 3 by welding.

As shown in Figure 2, the horizontal web of the channel-shaped steel plate 2 and the upper and lower flanges of the steel corbel 4 reserve the same elliptical holes, and the positions of all holes are vertically consistent; the diameter of the steel anchor rod 5 is smaller than the elliptical hole Width, vertically passing through the reserved holes of the channel steel plate 2 and the steel corbel 4. As shown in Figures 1 and 2, both ends of the steel anchor rod 5 are screwed with nuts 6, and there is a gap of 3 mm to 5 mm between the nut at the lower end and the bottom surface of the corbel. In order to allow the bridge deck system to slide freely along the longitudinal direction of the bridge, and at the same time form a tension connection between the bridge deck system and the pier.

As shown in Fig. 2 and Fig. 3, the steel sleeve 3 is prefabricated in two halves in the factory, and a stud connector 9 is welded inside. On site, the rough and planted reinforcement 8 is cut at a certain height below the top of the bridge pier, the steel sleeve 3 is positioned and spliced, and the post-cast concrete 10 is poured in to connect the steel sleeve 3 with the existing bridge pier 7 to form a whole.

As shown in Figure 3, elliptical holes are reserved on the horizontal web of the channel steel plate 2 and the steel corbel 4, the short axis of the hole is parallel to the transverse direction of the bridge deck, allowing the steel anchor rod 5 to pass through, and the long axis is the same as the bridge length. The directions are parallel, and the steel anchor rod 5 can slide freely.

Construction method of the present invention is:

The additional structure for preventing the lateral overturning of the existing bridge described in the present invention, its construction method is as follows: Anchor the steel plate 1 at the bottom of the bridge deck along the transverse direction of the bridge, and the steel plate is firmly connected with the bridge deck through the anchor piece; the splicing of the channel steel plate 2 is prefabricated in the factory and openings, and connect it to the steel plate 1 at the bottom of the bridge deck by welding to form a hollow box-shaped structure. The steel sleeve 3 is vertically divided into two semicircular steel pipes, prefabricated in the factory, and the stud connectors 9 are welded inside, and the finished two parts are positioned and spliced on site. Chiseling and planting reinforcement 8 in a certain height range below the top of the bridge pier, positioning and welding the steel sleeve 3, pouring post-cast concrete 10, fixing the steel sleeve 3 to a certain height range below the top of the existing bridge pier 7, this The determination of the height range should be based on the construction requirements. The welding and opening of the steel corbel 4 are prefabricated in the factory, and the welding of the steel corbel 4 and the semicircular steel sleeve 3 is completed. Pass the steel anchor rod 5 from bottom to top through the reserved holes of the steel corbel 4 and the channel steel plate 2, and tighten the nuts 6 at both ends to complete the tension connection between the bridge deck system and the bridge pier. There is a gap of 3 mm to 5 mm between the nut and the bottom surface of the steel corbel 4 . It should be noted that the diameter and number of the steel anchor rods 5 set in Figure 2 are not fixed, and can be designed and arranged according to the actual required pull-out resistance; the main function of the stud connector 9 in Figures 2 and 3 is to The load on the steel sleeve 3 is transmitted to the existing bridge pier 7, so the diameter and quantity of the required stud connectors 9 also need to be calculated according to the interface shear force actually transmitted.

The invention provides an additional structure for preventing the existing bridge from lateral overturning, which can provide sufficient anti-overturning moment when the bridge deck system bears eccentric loads, and greatly improves the stability of the bridge deck system (especially the bridge deck system of single-column pier bridges). overall solidity. The structural mechanics concept is clear, the force is reasonable, the material is easy to obtain, the structure is simple, the construction is convenient, the construction process does not affect the mechanical performance of the existing bridge and the normal traffic, economical and practical, and easy to realize.

Claims (3)

1. a kind of accessory configurations for preventing existing bridge lateral from toppling, it is characterised in that described construction includes floorings bottom Steel plate, troughing plate, steel bushing, steel corbel, steel anchor rod and nut；The steel plate by floorings bottom dabbing plant muscle, after Pouring concrete, is transversely anchored in floorings two bottom sides, and steel plate is firmly connected by anchoring piece with bridge deck；Troughing plate Vertical flange plate is connected by welding with steel plate；Muscle is planted in the following certain altitude scope dabbing of pier coping portion, with two semicircles Fastener for connection is into casting concrete again after steel bushing；Steel corbel is connected by welding with steel bushing；In the horizontal abdomen of troughing plate The reserved identical ellipse hole in the upper lower flange of plate and steel corbel, all position of opening are vertically being consistent, hole Short axle is parallel with bridge deck transverse direction, and width allows steel anchor rod to pass through, and the major axis of hole is parallel with bridge length direction, and hole length allows steel Anchor pole slides wherein；The diameter of steel anchor rod is less than oval hole width, vertically through reserving hole, by troughing plate and steel corbel Socketed, using nut twist at steel anchor rod both ends it is solid, wherein left between lower end nut and bracket bottom surface gap 3mm~ 5mm；The steel plate forms hollow box-like construction with troughing plate, and inside can accommodate the arrangement of nut and apply stubborn.

2. the accessory configurations according to claim 1 for preventing existing bridge lateral from toppling, it is characterised in that the steel plate is Be connected by anchoring piece with bridge bottom, the steel bushing being linked to be by two semicircle steel pipes then by peg and concrete with Surface dabbing plants the bridge pier connection of muscle, is welded with Welded-Stud Conectors on the inside of steel bushing, to meet power transmission demand, ensures the reliable of connection Property.

3. a kind of construction method for the accessory configurations for preventing existing bridge lateral from toppling, it is characterised in that this method includes following Step：

A. along bridge lateral in floorings bottom anchor plate；

B. it is prefabricated complete troughing plate splicing and perforate, by its with steel plate by being weldingly connected, form hollow box-like construction；

C., steel bushing is vertically divided into two semicircle steel pipes, prefabricated processing is completed in factory, and in its interior welds peg Connector, the two parts machined are positioned and spliced at the scene；

D. muscle, positioning and welding steel bushing are planted in pier coping portion region dabbing, rear pouring concrete, steel bushing is fixed on top of bridge pier The following certain altitude scope in portion, rule will be according to construction demand really for this altitude range；

E. it is prefabricated in the factory and completes the welding and perforate of steel corbel, and completes the welding of steel corbel and semicircle steel bushing；

F. steel anchor rod twist admittedly from bottom to top through steel corbel and the preformed hole of troughing plate at both ends using nut, under Gap 3mm~5mm is left between end nut and steel corbel bottom surface.