A method of secondary lining construction without formwork for tunnels using laminated slab technology

Abstract

The invention relates to a tunnel template-free secondary lining construction method using a laminated board technology, and belongs to the field of tunnel construction. The method comprises the stepsthat before secondary lining construction, laminated boards are prefabricated in different sections; during the construction of a primary support, anchoring connectors are pre-embedded in surroundingrock; the prefabricated laminated boards are spliced by fragment and fixed on the surrounding rock and the primary support through the pre-embedded anchoring connectors, and the two ends of each laminated board are connected with an inverted arch; after the laminated boards are spliced and fixed, pre-bonded reinforcing steel bars are inserted between the primary support and the laminated boards,structural bars on the laminated boards are connected with the inserted reinforcing steel bars, then sealing templates are installed on the side faces, and concrete is cast; after the cast-in-place concrete in the laminated boards at the two sides is finally set, post-cast strips are cast, and primarily-cast secondary linings at the two sides are connected. The method has the advantages that the templates can be saved, the occupied space is small, the continuous construction of the concrete is facilitated, the construction cost can be reduced, the construction period is shortened, and the method has significant economic benefits.

Description

technical field [0001] The invention relates to a template-less secondary lining construction method for tunnels using the laminated slab technology, and belongs to the technical field of tunnel construction. Background technique [0002] The traditional secondary lining construction of tunnels adopts cast-in-place formwork trolleys. The formwork trolleys are bulky and heavy, and special rails need to be installed for advancing construction. The formwork trolleys need to occupy a large amount of tunnel space during construction. Other processes and transportation caused serious interference; in addition, the formwork trolley needs to be demoulded and moved forward after the initial setting of the secondary lining concrete in the previous section to start the second section of concrete construction, so the construction period is longer; third, the formwork trolley The profile of the formwork is a standard section, so it is only suitable for the secondary lining construction o...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: the present invention provides a secondary lining construction method without formwork for tunnels using laminated slab technology, which aims to overcome the inherent defects of the existing tunnel secondary lining formwork trolley cast-in-place construction technology, overcome the need for formwork platform The vehicle cast-in-place construction technology has the disadvantages of large space occupation, long construction period, and poor adaptability to heterogeneous sections; by using the laminated slab technology to give full play to the advantages of precast concrete and cast-in-place concrete, a space-saving, fast construction speed, special-shaped The non-formwork construction technology of the tunnel secondary lining using the laminated slab technology with strong cross-section adaptability fundamentally improves the construction technology of the tunnel secondary lining, which helps to speed up the construction progress and save construction costs

Images