Joint construction of a prefabricated segmental concrete bridge

Abstract

The invention discloses a seam structure of a prefabricated sectional type concrete bridge and belongs to the field of bridge engineering. On the basis that a conventionally-used formwork is basically not changed, protruding blocks and corresponding grooves are prefabricated at the two ends of each section, and hole channels of connecting reinforcing steel bars are reserved in each protruding block. After the sections are spliced, the connecting reinforcing steel bars penetrate into the reserved hole channels and anchored. The section connecting portions are squeezed tightly, a seam between the prefabricated sections is high in shearing strength, the bending performance of a bridge body is enhanced, and cracking of the bottom of the seam is delayed. Even though a crack appears, the crack can be effectively prevented from being expanded through the connecting reinforcing steel bars, and therefore the bearing capacity of the bridge body is improved. Compared with the prior art, the structure is convenient to construct, the integrality of the bridge established through the structure is good, and the mechanical property of the seam is greatly improved.

Description

technical field [0001] The invention relates to a joint structure of a prefabricated segmental concrete bridge, which belongs to the field of bridge engineering. Background technique [0002] The prefabricated assembly construction method of the bridge is to divide the girder body into several segments, which are prefabricated in the prefabrication plant and then transported to the bridge site for assembly. This is a construction method for medium-span girder bridges. Due to the prefabrication in the factory in advance, there is little interference to the construction site, the construction speed is relatively fast, and the quality of the beam body is easy to control. It is especially suitable for bridges with a bridge length of more than 2 kilometers and urban viaducts. It has been widely used in recent years and is the future bridge construction. important direction of development. [0003] When the segmental method is used for construction, the joints between the prefabr...

AI Technical Summary

Problems solved by technology

The wet joints are connected by pouring concrete, and the wet joints are connected by ordinary steel bars, and the joints are well connected, but the concrete curing time is long, prolonging the construction period, and the cost is high; the dry joints are connected by applying epoxy glue and then tensioning and prestressing , the construction of dry joints is convenient, the construction speed is accelerated, the construction period is saved, the cost is reduced, and it has been widely promoted

[0004] However, when dry joints are used, since the main girder is discontinuous in the joint area, the ordinary steel bars that can transmit part of the normal stress and shear stress are broken here, and only the shear keys and prestressed steel tendons set at the joint Each segment is connected, and the length of a single segment is short, and the number of joints in each span is large, so the joints between segments are the weak links of the structure, and the mechanical behavior of the joints directly affects the overall structure of the bridge. performance

If the treatment is not good, the moisture and acid components in the atmosphere will enter the joints, which will lead to poor durability of the structure; or with the increase of traffic flow on the road and the increase of overloaded vehicles, it will cause damage to the joints between the segments

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