CN207685693U - A kind of hollow slab girder shear-carrying capacity ruggedized construction - Google Patents

Abstract

A hollow slab girder shear bearing capacity reinforcement structure. First, the surface of the bottom of the hollow slab girder is cleaned, and anchor holes are drilled at longitudinal intervals at the bottom of the hollow slab girder, and the shear tendons are implanted into the anchor holes one by one. The adhesive seals the opening of the anchor hole and pre-embeds the grouting nozzle. After the adhesive is cured, the positioning and fixing of the shear tendon is completed, and the filling material is injected from the grouting nozzle. After the grouting is completed, the filling material is cured. The surface of the hollow slab girder is maintained and cleaned to enhance the shear resistance of the hollow slab girder. This method overcomes the defects of the traditional reinforcement technology and solves the technical problem that it is difficult to implement the reinforcement of the shear capacity of the hollow slab girder. It is a reinforcement method that can replace the traditional removal of the side slab. Rapid reinforcement for shear capacity.

Description

A Hollow Slab Beam Shear Capacity Reinforcement Structure

technical field

The utility model relates to a bridge reinforcement method, in particular to a hollow slab girder shear bearing capacity reinforcement structure, which can be widely used in the technical field of bridge structure reinforcement.

Background technique

With the rapid development of China's economic and technological construction, bridge construction has reached a new height. According to relevant data, by the end of 2014, there were 757,100 highway bridges in the country, with a total length of 4,257.89 million meters. meters, 72,979 bridges, 18.6301 million meters, in the above data, small and medium span bridges accounted for more than 90%, and the hollow plate girder has the characteristics of simple structure, convenient transportation and construction, light weight and high degree of prefabrication. It has been widely used in bridges. Hollow slab girder bridges are currently one of the most commonly used bridge types in China, and most of the cross-sectional forms of small and medium-span bridges with a span of less than 20m are hollow slab girders.

With the rapid development of transportation, highway traffic flow and vehicle load are also increasing, which puts a huge pressure on the existing bridge structure, and some bridges with improper operation and maintenance have gradually produced various diseases, especially in the most used In a wide range of prefabricated hollow slab girder bridges, cracks and hinge damage are the two most representative and common diseases. These diseases affect the normal use of the bridge and even directly affect the safety of life. Oblique section cracks are one of the most difficult crack diseases to deal with. They are caused by the insufficient shear bearing capacity of hollow slab girders. If such bridges are not reinforced and reconstructed, the bridges cannot be put into normal use, and in severe cases, they may even collapse. , therefore, the economical and effective reinforcement technology for improving the shear capacity of hollow slab girders is imminent.

Aiming at the problem of insufficient shear capacity of hollow slab girders, some commonly used structural shear capacity reinforcement techniques, such as enlarging section reinforcement method, external prestress reinforcement method, paste steel plate method, paste carbon fiber cloth reinforcement technology, etc., seem to be ineffective. Applicable, because the shear reinforcement needs to increase the section or add materials to the side of the hollow slab girder, and the hollow slab girders are closely connected, especially the middle plate of the hollow slab girder, which cannot provide the necessary operating space for reinforcement, and often resists Hollow slab girders with insufficient shear bearing capacity are facing the fate of demolition and reconstruction, resulting in huge economic and social loss.

Contents of the invention

The purpose of this utility model is to solve the problem of insufficient shear bearing capacity of hollow slab beams in the field of civil engineering due to long-term disrepair and inadequate operation and maintenance, and to provide a construction that can be constructed at the bottom of hollow slab beams without interrupting traffic. A hollow slab beam shear bearing capacity reinforcement structure that is fast, efficient and has good reinforcement effect.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the bottom of the hollow slab beam is drilled with anchor holes at longitudinal intervals, the longitudinal spacing of the anchor holes is 30-100cm, and the depth should not be less than 2/3 of the height of the hollow slab beam. The tendons are implanted in the anchor holes one by one, and the anchor holes are sealed with adhesives and the grouting nozzles are pre-embedded. The grouting nozzles can be metal pipes, PVC pipes or plastic hoses. After the adhesive is cured, the alignment is completed. The positioning of the shear tendons is fixed, and the filling material is injected from the grouting nozzle. After the grouting is completed, the filling material is solidified, and the surface of the hollow slab beam is maintained and cleaned to form a reinforced structure for the shear bearing capacity of the hollow slab beam. The enhancement and reinforcement of the shear capacity of hollow slab beams, in terms of implementation method, the utility model comprises the following steps:

A. Surface cleaning: Grinding treatment on both sides of the bottom surface of the hollow slab beam to remove residual debris;

B. Drilling anchor holes: In the non-hollow part of the hollow slab beam, drill anchor holes vertically from bottom to top with a drill bit. The longitudinal spacing of the anchor holes is 30-100cm, and the depth should not be less than 2/3 of the height of the hollow slab beam. After the anchor hole is drilled, use a brush or high-pressure air to clean the inner wall of the anchor hole;

C. Fixing the shear tendons: insert the shear tendons into the anchor holes, and fill in hard objects around the lower end of the shear tendons to temporarily fix the shear tendons;

D. Seal the port of the anchor hole: Use adhesive to seal the lower port of the anchor hole and pre-embed the grouting nozzle. The grouting nozzle can be metal pipe, PVC pipe or plastic hose;

E. Inject filling material: inject the filling material into the anchor hole from the grouting nozzle until the anchor hole is full;

F. Maintenance and cleaning: After the filling material is injected, solidify and maintain the filling material. After the curing is completed, cut off the bottom part of the slab where the shear tendons are exposed, and clean the surface.

The filling material is one of cement mortar, epoxy mortar and epoxy resin glue.

The shear tendons are one of tendons, pipes, and cables, and their materials are one of metal and fiber-reinforced composite materials, and their diameters are not less than 8mm.

The anchor holes drilled should avoid the longitudinal main reinforcement in the hollow slab girder.

In the utility model, the shear bearing capacity of the hollow slab girder is improved by drilling holes and fixing the shear tendons, and the new reinforcement part realizes bonding and joint work with the original structure through the injection of filling materials. The reinforcement material adopts Traditional materials, low cost, simple calculation theory, the entire reinforcement construction is carried out at the lower part of the hollow slab girder, does not involve the bridge deck, does not have the slightest impact on the traffic on the bridge deck, is convenient and quick, and has significant economic and social benefits. The beneficial effects of the utility model are as follows:

(1) By implanting shear tendons and injecting filling materials, it has good bonding force with the original concrete of the hollow slab beam, and can provide good shear bearing capacity, which is a simple and effective reinforcement method.

(2) By drilling anchor holes at the bottom of the hollow slab girder, there is no impact on the bridge deck pavement and traffic on the bridge deck, and the traffic will not be interrupted during the entire reinforcement process, which can ensure the normal use of the hollow slab girder.

(3) It solves the technical problem that it is difficult to strengthen the shear bearing capacity of the middle plate of the hollow slab beam. This method can replace the traditional strengthening method of removing the side plate, and can quickly strengthen the shear bearing capacity of the hollow slab beam in a short time.

Description of drawings:

Fig. 1 is the longitudinal sectional view of the front hollow slab beam of the utility model after reinforcement;

Fig. 2 is the longitudinal sectional view of the reinforced hollow plate beam of the present invention;

Fig. 3 is the transverse cross-sectional view of the reinforced hollow slab beam of the present invention;

Fig. 4 is the surface cleaning schematic diagram of the present utility model;

Fig. 5 is a schematic diagram of drilling anchor holes of the present invention;

Fig. 6 is the fixed shear tendon schematic diagram of the present utility model;

Fig. 7 is a schematic diagram of the port of the sealing and anchoring hole of the present invention;

Fig. 8 is a schematic diagram of the injection filling material of the present invention;

Fig. 9 is a schematic diagram of maintenance and cleaning of the utility model;

Fig. 10 is a flow chart of the construction method of the present utility model.

In accompanying drawings 1 to 10, 1 is a hollow plate beam, 11 is an anchor hole, 2 is a shear tendon, 3 is an adhesive, 4 is a grouting nozzle, and 5 is a filling material.

Detailed ways:

Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described. The bottom of the hollow slab beam 1 is drilled with anchor holes 11 at longitudinal intervals. The longitudinal spacing of the anchor holes 11 is 30-100 cm, and the depth should not be less than 2/3 of the height of the hollow slab beam 1. The shear tendons 2 are implanted and anchored one by one. In the hole 11, use the adhesive 3 to seal the anchor hole and pre-embed the grouting nozzle 4. The grouting nozzle 4 can be metal pipe, PVC pipe or plastic hose. The positioning of 2 is fixed, and the filling material 5 is injected from the grouting nozzle 4. After the grouting is completed, the filling material 5 is solidified, and the surface of the hollow slab beam 1 is maintained and cleaned to form a reinforced structure for the shear bearing capacity of the hollow slab beam. On implementation method, the utility model comprises the following steps:

A. Surface cleaning: Grinding treatment on both sides of the bottom surface of the hollow slab beam 1 to remove residual debris;

B. Drill anchor holes: In the non-hollow part of the hollow slab beam 1, use a drill bit to vertically drill anchor holes 11 from bottom to top. 2/3, after the anchor hole 11 is drilled, use a brush or high-pressure air to clean the inner wall of the anchor hole 11;

C. Fixing the shear tendons: insert the shear tendons 2 into the anchor holes 11, and stuff hard objects around the lower end of the shear tendons 2 to temporarily fix the shear tendons 2;

D. Seal the port of the anchor hole: use the adhesive 3 to seal the lower port of the anchor hole 11 and pre-embed the grouting nozzle 4. The grouting nozzle 4 can be metal pipe, PVC pipe or plastic hose;

E. Filling material injection: inject the filling material 5 from the grouting nozzle 4 into the anchor hole 11 until the anchor hole 11 is filled;

F. Maintenance and cleaning: After the filling material 5 is injected, the filling material 5 is solidified and cured. After the curing is completed, the bottom part of the slab exposed by the shear tendons 2 is cut off, and the surface is cleaned.

The filling material 5 is one of cement mortar, epoxy mortar and epoxy glue.

The shear tendons 2 are one of tendons, pipes, and cables, and their materials are one of metal and fiber-reinforced composite materials, and their diameters are not less than 8mm.

The anchor holes 11 should be drilled to avoid the longitudinal main ribs in the hollow slab beam 1 .

Claims (4)

1. a kind of hollow slab girder shear-carrying capacity ruggedized construction, it is characterised in that：The longitudinally spaced brill in bottom of hollow slab girder (1) Equipped with anchor hole (11), anchor hole (11) longitudinal pitch is 30~100cm, and depth should be not less than the 2/ of hollow slab girder (1) height 3, shear bar (2) corresponds in implantation anchor hole (11), is sealed anchor hole hole and pre-buried grouting nozzle using binder (3) (4), metal tube, pvc pipe or plastic flexible pipe can be used in grouting nozzle (4), is completed to shear bar (2) after to be bonded dose (3) solidification Positioning is fixed, the injection out of grouting nozzle (4) by packing material (5), material (5) solidification to be filled after slip casting, to cored slab Beam (1) surface carries out maintenance cleaning, forms a kind of hollow slab girder shear-carrying capacity ruggedized construction.

2. a kind of hollow slab girder shear-carrying capacity ruggedized construction according to claim 1, it is characterised in that：The filling material Expect that (5) are one kind in cement mortar, epoxy resin mortar, epoxide-resin glue.

3. a kind of hollow slab girder shear-carrying capacity ruggedized construction according to claim 1, it is characterised in that：The shear bar (2) it is muscle material, one kind in tubing, rope material, material is one kind in metal, fibre reinforced composites, and diameter is not small In 8mm.

4. a kind of hollow slab girder shear-carrying capacity ruggedized construction according to claim 1, it is characterised in that：It is described to be drilled with anchor Solid hole (11) should avoid the lengthways main steel bar in hollow slab girder (1).