Pre-buried guide rail and its construction method in tunnel pre-buried

Abstract

The invention provides a pre-embedded guide rail and a pre-embedded guide rail construction method in duct pre-embedding, and relates to a duct pre-embedding device applied in water conservancy, hydropower and other building engineering and the pre-embedded guide rail construction method. According to the pre-embedded guide rail, two rebars are considered as one group and distributed on the surface of a circular chamber to form an annular way, the front end and the tail end of the pre-embedded guide way are connected to a precast anchorage slot, and a horn opening is formed between the two end openings of the anchorage slot in advance. The pre-embedded guide way construction method in the duct pre-embedding includes the steps that the installation position of the pre-embedded guide rail is determined; the pre-embedded guide rail is distributed on the surface of the circular chamber in an annular mode to form the annular way; a corrugated pipe is arranged in the pre-embedded guide rail; an U-shaped pipe diameter limiting clamp is arranged on the corrugated pipe. The pre-embedded guide rail and the c pre-embedded guide rail construction method in the duct pre-embedding has the advantages that the pre-embedded guide rail is arranged in the pre-stressed anchor cable duct pre-embedding construction process of the pressure pipeline structure so that the corrugated pipe linetype can be guided to keep smooth, the installation accuracy of the pre-embedded corrugated pipe is guaranteed, and the guide difficulty in the corrugated pipe installation process is solved effectively.

Description

Technical field: [0001] The invention relates to a pre-embedded guide rail and its construction method in pre-embedded tunnels, and relates to a device for pre-embedded tunnels in construction projects such as water conservancy and hydropower, and its construction method. Background technique: [0002] In the construction of pressure pipe structures in construction projects such as water conservancy and hydropower, ring anchor prestressing construction is a key step, and channel pre-embedding is the first step in the entire ring anchor prestressing construction process. The traditional method of tunnel pre-embedded construction is: use lead wire to bind and fix the bellows and structural steel bars. This method is simple, but there are many defects, such as the binding is not firm, the positioning is not accurate, the line of the bellows is not smooth, and when pouring concrete The bellows are prone to displacement, deformation, damage, blockage of the bellows channel, etc.,...

AI Technical Summary

Problems solved by technology

However, in the ring anchor prestressed construction, the wall of the cavern is very thin (the concrete poured on the corrugated pipe and the structural steel bar is only 45cm thick), and the distance between the ring anchors is only 45cm, and the operating space is insufficient. The installation position of the pre-embedded bellows must be precisely limited to guide the pre-installation. It is still a difficult problem to keep the line shape of the buried bellows smooth

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