UHPC lining structure used for tunnel and construction method of UHPC lining structure

Abstract

The invention discloses a UHPC lining structure used for a tunnel and a construction method of the UHPC lining structure. The UHPC lining structure is a composite lining structure composed of anchor rod supporting bodies and a UHPC lining supporting layer. Each anchor rod supporting body comprises an anchor rod hole, an anchor rod and a UHPC hole channel grouting material. The UHPC lining supporting layer comprises a water draining blind pipe, an injection UHPC lining layer, a decoration layer and a tunnel outline light reflecting bar. The UHPC lining structure used for the tunnel and the construction method of the UHPC lining structure have the following beneficial effects that the UHPC injection concrete supporting layer has high pressure resisting strength, high bending resisting strength, high toughness, high durability and good microcrack self-healing capability, UHPC is adopted as the tunnel project lining material, the lining structure construction speed is high, the supportingperformance is good, the thickness of the lining structure can be reduced obviously, and therefore the practical excavation sectional area and the slag generation amount of the tunnel can be reduced effectively, and the construction difficulty is lowered; and compared with a traditional tunnel supporting structure, the arrangement of a reinforcement net, a waterproof layer and a steel frame can beomitted, the construction efficiency is effectively improved, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of mountain tunnel engineering, in particular to a UHPC lining structure for tunnels and a construction method thereof. Background technique [0002] At present, the support of mountain tunnel engineering in my country usually adopts composite lining. The composite lining mainly includes three construction links: anchor shotcrete layer, waterproof layer, and secondary lining. The anchor shotcrete layer mainly includes anchor rods, hanging steel wire mesh, steel grid or Steel arch frame, sprayed ordinary concrete, secondary lining is mainly molded cast-in-place ordinary concrete or molded cast-in-place reinforced ordinary concrete. [0003] The actual excavation section size of the tunnel project is the clear section of the tunnel plus the thickness of the lining plus the reserved deformation value. In the current design parameters of the composite lining of the two-lane tunnel, the thickness of the primary li...

AI Technical Summary

Problems solved by technology

[0003] The actual excavation section size of the tunnel project is the clear section of the tunnel plus the thickness of the lining plus the reserved deformation value. In the current design parameters of the composite lining of the two-lane tunnel, the thickness of the primary lining shotcrete is 5cm to 28cm, and the thickness of the secondary lining is : 30cm to 50cm, the cumulative thickness of the composite lining structure is 35cm to 78cm, resulting in an increase in the required excavation cross-sectional area and slag discharge, which increases the workload and construction difficulty; at the same time, the composite lining structure The primary lining usually needs to be equipped with steel mesh, steel arch frame or steel grid arch frame, and a waterproof layer needs to be installed between the primary lining and the second lining. The construction procedures are many and complicated, and the required construction period is long.

At the same time, due to the particularity of tunnel engineering, the strength and impermeability of ordinary concrete require other supporting measures to achieve the purpose of effective support. Considering the difficulty of construction and project cost, the traditional composite lining structure needs to be further optimized

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