CN203878753U - High-strength bolt shear key structure - Google Patents

Abstract

<b/>A high-strength bolt shear key structure. The structure includes steel beams composed of steel beam webs and steel beam flanges, prefabricated concrete slabs, high-strength bolts, and connectors consisting of upper backing plates, lower backing plates and supporting steel pipes; the upper and lower ends of the supporting steel pipes are connected to the upper backing plate and The lower backing plate is offset and fixed, and the connectors are poured into the prefabricated concrete slab. Manufactured by the following method, the steel beam web and the steel beam flange plate are processed into a steel beam in the form of an I-beam, and the precast concrete slab is manufactured at the same time, and the connecting piece consisting of the upper backing plate, the lower backing plate and the supporting steel pipe is poured At the design position of the precast concrete slab, the supporting steel pipe is sandwiched between the upper backing plate and the lower backing plate; the precast concrete slab is laid on the steel beam, and the supporting steel pipe of the connector is used as a template for drilling; the precast concrete The plate and the flange plate of the steel girder are bolted in place until they fit together, and the two are connected by the clamping force of the high-strength bolts.

Description

A high-strength bolt shear key structure

technical field

The utility model relates to a high-strength bolt shear key structure used to connect steel beams and prefabricated concrete slabs, and belongs to the technical field of civil engineering construction. the

Background technique

The prefabricated steel-concrete composite structure combines steel beams and prefabricated concrete slabs to work together through shear connectors, which can give full play to the respective advantages of steel and concrete, and is environmentally friendly, convenient for construction, and economical. Advantages, increasingly widely used. the

Shear keys are key components in steel-concrete composite structures, and there are many forms. The high-strength bolt shear key connects the precast concrete slab and the flange plate of the steel beam through the clamping force of the high-strength bolt. It has the advantages of easy guarantee of connection quality, quick and convenient construction, and easy replacement of concrete slab, and has broad application prospects. At present, the concrete in the ordinary high-strength bolt shear key directly bears the preload of the high-strength bolts. Under the local high stress, the creep of the concrete causes the pretension relaxation of the high-strength bolts to be more prominent, resulting in the reduction of the connection performance of the composite structure. the

Utility model content

The purpose of this utility model is to provide a high-strength bolt shear key structure with simple structure, convenient construction, and effective reduction of pre-tension relaxation. the

The technical scheme of the utility model is:

A high-strength bolt shear key structure, including a steel beam composed of a steel beam web and a steel beam flange, a prefabricated concrete slab, high-strength bolts, and a connecting piece consisting of an upper backing plate, a lower backing plate, and a supporting steel pipe; the supporting steel pipe The upper and lower ends are respectively fixed against the upper backing plate and the lower backing plate. The steel beam flange plate, the upper backing plate and the lower backing plate are all provided with round holes on the axis of the supporting steel pipe that are suitable for high-strength bolts. The supporting The inner diameter of the steel pipe is not smaller than the diameter of the above-mentioned circular hole, and the connecting piece is poured in the prefabricated concrete slab.

The beneficial effects of the utility model are: the utility model has a simple structure and is convenient for construction. The supporting steel pipe is not only the channel of the high-strength bolt in the prefabricated concrete slab, but also the supporting frame of the high-strength bolt, which bears most of the pre-stressed force of the high-strength bolt, thus greatly Reduce the pressure on the concrete, so that the creep of the concrete is significantly reduced, which can effectively reduce the relaxation of the pretension of the high-strength bolts, and enhance the shear connection capacity and strength of the composite structure. the

Description of drawings

Figure 1 is a front sectional view of an embodiment of the utility model. the

FIG. 2 is a side sectional view of FIG. 1 . the

FIG. 3 is a top sectional view of FIG. 1 . the

Marked in the figure, 1. steel beam web, 2. steel beam flange, 3. prefabricated concrete slab, 4. high-strength bolts, 5. upper backing plate, 6. lower backing plate, 7. supporting steel pipe. the

Detailed ways

Example 1

A high-strength bolt shear key structure, including a steel beam composed of a steel beam web 1 and a steel beam flange 2, a prefabricated concrete slab 3, high-strength bolts 4, and an upper backing plate 5, a lower backing plate 6, and a supporting steel pipe 7 Connectors, the upper and lower ends of the supporting steel pipe 7 are respectively fixed against the upper backing plate 5 and the lower backing plate 6, and the steel beam flange plate 2, the upper backing plate 5 and the lower backing plate 6 are on the axis of the supporting steel pipe 7 All are provided with round holes adapted to the high-strength bolts 4, the inner diameter of the supporting steel pipe 7 is not smaller than the diameter of the above-mentioned round hole, the connecting piece is poured in the precast concrete slab 3, the supporting steel pipe 7 is used as a supporting Most of the high-strength bolts are pre-stressed, so as to reduce the pressure on the concrete, significantly reduce the creep of the concrete, reduce the relaxation of the pre-tension of the high-strength bolts, and enhance the shear connection capacity and strength of the composite structure.

As shown in Figures 1 to 3, a high-strength bolt shear key structure of the present invention. The steel beam web 1 and the steel beam flange 2 form a steel beam; the upper and lower ends of the supporting steel pipe 7 are respectively welded and fixed with the upper backing plate 5 and the lower backing plate 6 to form a connecting piece, and the upper backing plate 5 and the lower backing plate 6 are connected to the supporting steel pipe The axis of 7 is provided with round holes adapted to the high-strength bolts 4, and the connectors are poured in the precast concrete slab 3; the concrete slab 3 is symmetrically placed on the steel beam flange plate 2 according to the supporting steel pipe 7, and the steel beam flange 2 is placed on the supporting steel pipe The axis of 7 is provided with a round hole adapted to the high-strength bolt 4; the screw rod of the high-strength bolt 4 passes through the upper backing plate 5, the supporting steel pipe 7, the lower backing plate 6 and the steel beam flange plate 2 in turn, and then the nuts are tightened to complete the steel beam. Connection to precast concrete slabs. the

Example 2

A construction method for a high-strength bolt shear key structure. Firstly, a steel beam web 1 and a steel beam flange 2 are processed into a steel beam in the form of an I-beam, and a precast concrete slab 3 is manufactured at the same time, and the upper backing plate 5. The connecting piece consisting of the lower backing plate 6 and the supporting steel pipe 7 is poured on the design position of the precast concrete slab, and the supporting steel pipe 7 is sandwiched between the upper backing plate 5 and the lower backing plate 6; then the construction site of the steel beam is completed erection, and then lay the precast concrete slab 3 on the steel beam, and use the supporting steel pipe 7 of the connector as a formwork for drilling; finally, the precast concrete slab 3 and the flange plate 2 of the steel beam are bolted in place until they fit together state, the two are connected by the clamping force of the high-strength bolt 4 .

Claims (1)

1. a high-strength bolt shear key structure, it is characterized in that: the girder steel that comprises steel beam web plate (1) and girder steel frange plate (2) composition, precast concrete plank (3), high-strength bolt (4) and by upper padding plate (5), the connector of lower bolster (6) and supporting steel pipe (7) composition, the two ends up and down of described supporting steel pipe (7) offset with upper padding plate (5) and lower bolster (6) respectively and are fixing, described girder steel frange plate (2), upper padding plate (5) and lower bolster (6) are equipped with the circular hole adaptive with high-strength bolt (4) on the axis of supporting steel pipe (7), the internal diameter of described supporting steel pipe (7) is not less than the diameter of above-mentioned circular hole, described connector is built in precast concrete plank (3).