CN203065951U - Joint structure of precast hollow slab girders - Google Patents

Abstract

The utility model discloses a joint structure of precast hollow slab girders. The joint structure of the precast hollow slab girders comprises the two precast hollow slab girders which are arranged side by side in a parallel and level mode, cantilevers of the two precast hollow slab girders are arranged in a butt joint mode, a later-casting joint concrete layer is arranged on an upper casting surface of each cantilevel, and the upper surface of the later-casting joint concrete layer and the top surfaces of two box bodies are arranged in a parallel and level mode. The joint structure of the precast hollow slab girders has the advantages of solving the problems existing in traditional hollow slab girders, achieving convenient and reliable connection of the slab girders, and meanwhile strengthening transverse connection of the slab girders.

Description

Connection structure of prefabricated hollow slab beams

technical field

The utility model relates to the technical field of hollow slab beams, in particular to a connection structure of prefabricated hollow slab beams. the

Background technique

In the traditional prefabricated hollow slab girder structure shown in FIG. 1 , the horizontal connection and internal force transmission are realized through inter-beam hinge joints 101 between the plate girders. Due to the small size and section of the hinge joint 101, the weak connection between the joints results in weak transverse connection between the plates. Under the repeated action of vehicle loads, the hinge joints are prone to cracking and damage, which will eventually lead to the destruction of the bridge deck pavement and even the occurrence of plate girder falling beam accidents. the

Therefore, those skilled in the art are committed to developing a method that overcomes the problems of the above-mentioned traditional hollow plate girder, realizes convenient and reliable connection between plate girder and plate girder, and strengthens the transverse connection between plate girder and plate girder at the same time. Connection structure of prefabricated hollow slab beams. the

Utility model content

In view of the above-mentioned deficiencies in the prior art, the utility model proposes to overcome the above-mentioned problems existing in the traditional hollow slab girder, realize convenient and reliable connection between the slab girder and the slab girder, and at the same time strengthen the transverse direction between the slab girder and the slab girder. Connection construction of connected prefabricated hollow-core slab beams. the

In order to achieve the above purpose, the utility model provides a connection structure of prefabricated hollow slab girders, which comprises two prefabricated hollow slab girders arranged side by side, and the cantilevers of the two prefabricated hollow slab girders are butt-jointed. A post-cast joint concrete layer is provided on the upper pouring surface of the cantilever, and the upper surface of the post-cast joint concrete layer is arranged flush with the top surfaces of the two boxes. the

Preferably, the part of the pre-embedded steel bars exposed on the upper pouring surface is connected with longitudinal steel bars and transverse steel bars, which further improves the practicability and reliability of the utility model. the

Preferably, foam or wooden strips for preventing grout leakage are filled between the butt joint surfaces of the two cantilevers, which further improves the practicability and reliability of the present utility model. the

The connection structure of the prefabricated hollow slab girders of the utility model not only increases the butt joint connection size of the two prefabricated hollow slab girders, but also realizes that the horizontal connection of the slab girders is changed from a hinge joint to a steel joint, so as to improve and strengthen the connection between the slab girders. purpose, thereby overcoming the problems existing in the traditional hollow slab girder. In addition, this connection structure cleverly uses the upper pouring surfaces of the two cantilevers as the bottom formwork for the post-cast joint concrete layer, which saves the bottom formwork for the wet joint construction of conventional rigidly connected bridges. the

The conception, specific structure and technical effects of the present utility model will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, characteristics and effects of the present utility model. the

Description of drawings

Figure 1 is a schematic diagram of the connection structure of a traditional prefabricated hollow slab girder. the

Fig. 2 is a structural schematic diagram of the prefabricated hollow slab girder in this embodiment. the

Fig. 3 is a structural schematic diagram of the connection structure of the prefabricated hollow slab girder of the present invention. the

Detailed ways

As shown in accompanying drawing 2 and Fig. 3, present embodiment at first comprises a kind of prefabricated hollow slab girder, and the material of hollow slab girder is prestressed reinforced concrete, comprises a strip type hollow box body 1, wherein, in box body 1 Two oppositely arranged outer sides 5 are close to the top surface 6 of the box body 1, each extending outward is provided with a cantilever 2 used as a post-cast concrete layer 7 for carrying the bottom plate between the beams, and the upper pouring surface 3 of the cantilever 2 is lower than Top 6 settings. the

Further, the upper pouring surface 3 of the cantilever 2 is provided with pre-embedded steel bars 4 for connecting the post-cast joint concrete layer 7, and the box body 1 and the two outwardly extending cantilevers 2 of this embodiment are integrally cast with reinforced concrete . the

A specific embodiment of the connection structure of the prefabricated hollow slab girder as shown in Figure 3 includes two prefabricated hollow slab girders arranged side by side, the cantilevers 2 of the two prefabricated hollow slab girders are butted, and The upper pouring surface 3 of the cantilever 2 is provided with a post-cast joint concrete layer 7 , and the upper surface (not shown in the figure) of the post-cast joint concrete layer 7 is flush with the top surfaces 6 of the two boxes 1 . the

As a further implementation of this embodiment, the part where the pre-embedded steel bar 4 exposes the upper pouring surface 3 is connected with longitudinal steel bars (that is, the steel bars arranged along the length direction of the box body 1) and transverse steel bars (that is, the steel bars arranged along the length direction of the box body 1) steel bars arranged in the width direction); foam (not shown in the figure) for preventing grout leakage is filled between the butt joint surfaces of the two cantilevers 2, and of course other fillers such as wooden strips can also be filled. the

Since this embodiment adds cantilevers on both sides of the box body, the prefabricated hollow slab girder of this embodiment overcomes the above-mentioned problems existing in the traditional hollow slab girder, and can conveniently and reliably realize the connection between the plate girder and the plate girder. Transverse connection between plate girder and plate girder. The connection structure of prefabricated hollow slab girders not only increases the butt joint connection size of two prefabricated hollow slab girders, but also realizes the transformation of horizontal connection of slab girders from hinged joints to steel joints, so as to improve and strengthen the connection between slab girders, thereby It overcomes the problems existing in traditional hollow slab beams. the

In application, after hoisting the prefabricated hollow slab girder of this embodiment in place, fill the gap between the butt joints of the cantilever of the slab girder (that is, the connection joint of the slab girder) with foam to prevent grout leakage; then bind the longitudinal reinforcement on the pre-embedded reinforcement The post-cast concrete layer is formed by pouring joint concrete on site with the transverse steel bars to realize the rigid connection between the slabs and girders. When the post-cast concrete layer is poured, the upper pouring surfaces of the two cantilevers are used as the bottom form of the post-cast joint concrete layer, which can save the bottom formwork of the conventional rigidly connected bridge wet joint construction. the

The preferred specific embodiments of the present utility model have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present utility model without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection defined by the claims . the

Claims (3)

1. A connection structure of a prefabricated hollow slab girder, characterized in that it comprises: two prefabricated hollow slab girders arranged flush side by side; A post-cast joint concrete layer is arranged on the upper pouring surface of the box, and the upper surface of the post-cast joint concrete layer is arranged flush with the top surfaces of the two boxes. the 2. The connection structure according to claim 1, characterized in that: the part of the pre-embedded reinforcement exposing the upper pouring surface is connected with longitudinal reinforcement and transverse reinforcement. the 3. The connection structure according to claim 1, characterized in that: foam or wooden strips for preventing grout leakage are filled between the two cantilever butt joint surfaces. the

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