CN202830788U - Supporting structure with beam fulcrum below bridge cantilever - Google Patents

Abstract

The utility model discloses a fulcrum supporting structure of a convenience beam under a cantilever slab of an existing bridge, which belongs to the technical field of reinforcement of a convenience beam fulcrum. It includes a steel pier arranged under the cantilever plate and in contact with the cantilever plate and a reinforced concrete base (10) provided under the steel pier. The steel pier includes two vertically arranged channel steel main supports ( 7), the top plate (2) connected to the top surface of the channel steel main brace (7), the bottom plate (3) connected to the bottom of the channel steel main brace (7), and the two channel steel main braces (7) are connected with Several ribbed steel plates, between the top plate (2) and the channel steel main support (7) and between the bottom plate (3) and the channel steel main support (7) are provided with several corbels (8) , the reinforced concrete base (10) is connected to the bottom plate (3) of the steel pier through pre-embedded adjusting bolts (4) thereon. The utility model has high overall stability, can check its displacement and settlement changes at any time during use, and adjust in time, and has low construction difficulty, which can save a lot of labor.

Description

A fulcrum support structure of the cantilever slab under the existing bridge

technical field

The utility model relates to a support structure for reinforcing the fulcrum of the convenience beam under the cantilever plate when the fulcrum of the convenience beam is located on the cantilever plate of the existing bridge, and belongs to the technical field of reinforcement of the fulcrum of the convenience beam.

Background technique

In the construction of railways and highways, the jacking method is often used, and the construction beams are used as temporary structures to reinforce the existing lines. In jacking construction, sometimes the fulcrum of the construction beam is located on the cantilever plate at the top of the existing frame, and the cantilever plate is the weakest part of the frame, which cannot bear such a large load. In the past, a large area of fastener-type scaffolding was used to support the weak parts of the frame. The vertical and horizontal rod spacing of the scaffolding was 25cm, and the top of the scaffolding used adjustable support. The erection of this kind of supporting structure requires a lot of labor, the construction is difficult and slow, and requires high bearing capacity of the original ground. When erecting the scaffolding, it must be adjusted in place at one time. When a train passes by during use, dynamic loads and vibrations are generated. There will be loosening of parts and adjustable top support, but manual maintenance cannot enter the support structure, which has great potential safety hazards, and the construction safety factor is very low.

Contents of the invention

Aiming at the above-mentioned defects in the prior art, the utility model provides a fulcrum support structure of the cantilever slab under the existing bridge with stable structure, less construction difficulty, less labor cost and convenient maintenance.

The utility model is realized through the following technical solutions: an existing bridge cantilever slab fulcrum support structure, which is special in that it includes a steel pier and a design under the cantilever slab and in contact with the cantilever slab. The reinforced concrete base at the bottom of the steel pier, the steel pier includes two vertically arranged channel steel main braces, a top plate connected to the top surface of the channel steel main brace, and a bottom plate connected to the bottom of the channel steel main brace, Several ribbed steel plates are connected between the two channel steel main supports, and several corbels are arranged between the top plate and the channel steel main support and between the bottom plate and the channel steel main support. The concrete base is connected with the bottom plate of the steel pier through pre-embedded adjusting bolts thereon.

The utility model can transfer the static load of the convenience beam and the dynamic load when the train passes through the steel pier to the foundation, so that the force transfer of the cantilever plate is carried by the support structure, thereby ensuring the safety of the fulcrum of the convenience beam.

In order to ensure reliable contact between the steel pier and the cantilever plate, and to ensure reliable transfer of loads on the cantilever plate, the upper surface of the top plate is an inclined surface matching the bottom surface of the cantilever plate.

In order to ensure the overall stability of the supporting structure, the surface layer of the reinforced concrete base is equipped with steel bars with vertical and horizontal spacings of 15 cm.

The beneficial effects of the utility model are: the utility model has simple structure, high overall stability, can check its displacement and settlement changes at any time during use, and adjust in time, effectively ensuring driving safety and personal safety, and greatly improving the construction safety factor . Adopting the utility model to reinforce the fulcrum of the convenient beam can save a lot of labor and greatly reduce the construction cost.

Description of drawings

Fig. 1 is the structural representation of the specific embodiment of the utility model;

Fig. 2 is A-A schematic diagram in Fig. 1;

In the figure: 1. Existing bridge cantilever plate, 2. Top plate, 3. Bottom plate, 4. Adjusting bolt, 5. Ribbed steel plate, 6. Ribbed steel plate, 7. Channel steel main brace, 8. Corbel, 9. Construction beam, 10, concrete base.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in the accompanying drawings 1-2, it is an existing bridge cantilever slab fulcrum support structure, which includes a steel pier arranged under the cantilever slab 1 of the existing bridge and in contact with the cantilever slab and a steel pier set on the cantilever slab. The reinforced concrete base 10 of the lower part of the pier. Described steel support pier comprises two vertically arranged channel steel main braces 7, a top plate 2 connected to the top surface of channel steel main braces 7, a base plate 3 connected to the bottom of channel steel main braces 7, wherein the two channel steel main braces The braces 7 are set face to face, and several ribbed steel plates 5 and several ribbed steel plates 6 are welded between the two channel steel main braces 7, and the ribbed steel plates 5 and ribbed steel plates 6 securely connect the two channel steel main braces 7 connected together. Both the top plate 2 and the bottom plate 3 are steel plates, which are respectively welded to the top and bottom of the channel steel main brace 7 by means of welding. Several corbels 8 are welded between the top plate 2 and the channel steel main brace 7 and between the bottom plate 3 and the channel steel main brace 7 . The reinforced concrete base 10 is a C25 reinforced concrete foundation, and its surface layer is equipped with steel bars with a diameter of Φ16 and a vertical and horizontal spacing of 15 cm. Adjusting bolts 4 are pre-embedded on the reinforced concrete base 10 , and the bottom plate 3 of the steel pier is connected to the reinforced concrete base 10 through the adjusting bolts 4 .

In order to ensure reliable contact between the steel pier and the cantilever plate, the upper surface of the top plate 2 is an inclined surface matching the bottom surface of the cantilever plate.

When the utility model is being constructed on the spot, it should be repeatedly measured and checked on the spot to accurately measure the position of the steel pier and the height of the steel pier. The stress centers of the buttresses coincide. Then pour the reinforced concrete base 10 and pre-embed the adjusting bolt 4, and cut two channel steel main braces 1, top plate 2, base plate 3, corbel 8, ribbed steel plate 5 and ribbed steel plate 6 simultaneously. When the strength of the base reaches 100%, the position of the steel pier is accurately determined on the base surface, the base plate 3 is placed, and the two channel steel main supports 1 are erected on the base plate 3 and positioned. The steel is fixed, and then the top plate 2 is welded, the ribbed steel plate 6, and the corbel steel plate 8 are welded. By adjusting the nut of the adjusting bolt 4, the top plate 2 and the bottom surface of the cantilever plate are tightly connected. The thick thin steel plate is packed tightly so that the load can be directly transmitted from the steel pier to the base to the foundation.

When the utility model is in use, the static load of the convenience beam and the dynamic load when the train passes are transmitted to the foundation by the utility model, so that the force transfer of the cantilever plate is carried by the support structure, which ensures the safety of the fulcrum of the convenience beam.

When the utility model is in use, the dynamic load and vibration generated by the passage of the train can be regularly checked for changes in the displacement and settlement of the steel pier, and the change can be repaired in time if the change exceeds the limit.

The utility model has the advantages of simple structure, convenient material acquisition, simple manufacture, low cost and high practicability. The problems of maintenance and safety hazards can completely replace the existing technical scheme of using fastener-type scaffolding as the fulcrum of the beam.

Other parts in the utility model adopt prior art, do not repeat them here.

Claims (3)

1. a kind of existing bridge cantilever slab lower convenient beam fulcrum support structure, it is characterized in that: comprise the steel buttress that is located at under the cantilever slab and contact with cantilever slab and be located at the reinforced concrete base (10 ), the steel pier includes two vertically arranged channel steel main supports (7), a top plate (2) connected to the top surface of the channel steel main support (7), a bottom plate connected to the channel steel main support (7) Bottom plate (3), several ribbed steel plates are connected between two channel steel main braces (7), between said top plate (2) and channel steel main braces (7) and between said bottom plate (3) and There are several corbels (8) between the channel steel main supports (7), and the reinforced concrete base (10) connects with the bottom plate (3) of the steel pier through the pre-embedded adjusting bolts (4) on it. connect. 2. The fulcrum support structure of the cantilever slab under the existing bridge according to claim 1, characterized in that: the upper surface of the top slab (2) is an inclined surface matching the bottom surface of the cantilever slab. 3. According to claim 1 or 2, the existing bridge cantilever slab fulcrum support structure, characterized in that: the surface layer of the reinforced concrete base (10) is equipped with steel bars with a vertical and horizontal spacing of 15cm.

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