Trolley steel end mold for cingulum waterstop positioning and secondary lining construction method

Abstract

The invention discloses a trolley steel end mold for cingulum waterstop positioning and a secondary lining construction method. The trolley steel end mold comprises a plurality of sets of arc steel mold plates. The multiple sets of arc steel mold plates form the trolley steel end mold with the same shape as the section of a constructed tunnel, a sealing layer for sealing is arranged between the trolley steel end mold and a preliminary bracing structure, and the thickness of the sealing layer is smaller than the distance between the outer edge of the steel end mold and the preliminary bracing structure. The construction method comprises the following steps of 1 placing a trolley in place, 2 installing and positioning a cingulum waterstop, 3 installing the sealing layer, 4 pouring concrete and 5 removing the mold. The trolley steel end mold is simple in structure and convenient to operate, and the input cost is small; construction steps are simple; the using effect is good, and the practical value is high; the cingulum waterstop needing to be positioned is fixed into a clamping groove formed by inner arc plates and outer arc plates of the arc steel mold plates, the installation quality of the cingulum waterstop is ensured, meanwhile, the construction period is shortened, and usage and popularization are convenient.

Description

technical field [0001] The invention belongs to the technical field of tunnel arch wall lining end formwork construction, and in particular relates to a trolley steel end formwork for positioning a mid-buried waterstop and a secondary lining construction method. Background technique [0002] At present, the secondary lining of tunnels is mostly constructed by the trolley mold construction method. In order to improve the waterproof function of the lining, the arch wall waterproof board (EVA, etc.) and concrete with high impermeability grade are basically used. In case of leakage, a mid-buried waterstop is designed and installed at the end of the secondary lining. The end formwork of the general secondary trolley is processed and assembled with wooden boards, and the buried waterstop is fixed with steel bar bend clips. It is difficult to ensure the installation quality of the buried waterstop during construction. [0003] It is very difficult to process and install the wooden...

AI Technical Summary

Problems solved by technology

The end formwork of the general secondary trolley is processed and assembled with wooden boards, and the buried waterstop is fixed with steel bar bend clips. It is difficult to ensure the installation quality of the buried waterstop during construction.

[0003] It is very difficult to process and install the wooden formwork as the stopper formwork. Firstly, the raw material of the wooden formwork and the tools for processing the formwork must be transported to the site, and the wooden strips of appropriate length shall be processed according to the outline of the initial support structure, and assembled one by one from both sides of the lower part of the trolley. At the same time, the mid-buried waterstop is first fixed at 90° with steel bars, and then fixed to the small formwork. The mid-buried waterstop has a relatively high mass, and its rigidity increases after being fixed at 90°, which is very inconvenient to operate. After the formwork is assembled, the outer side needs to be supported. The entire formwork installation requires at least 4 people and takes 6 hours. It is very time-consuming and laborious. At the same time, it wastes turnover materials. The installation quality of the main buried waterstop is difficult to guarantee.

Therefore, the buried waterstop is all inside the formwork. If the workers are sloppy or have a weak sense of responsibility and poor technology, the buried waterstop will often be in an incorrect position after the formwork is removed, and the buried depth will exceed the standard. The belt is overwhelmed and not buried in concrete, which seriously affects the waterproof effect of the buried waterstop, leaving a large construction hidden danger for the tunnel

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