A plug structure installed between formwork trolley and surrounding rock and its installation method

Abstract

The invention relates to the field of tunnel engineering construction equipment, and discloses a plug structure mounted between a template trolley and surrounding rock, and a mounting method of the plug structure. The plug structure is characterized in that a first elastic material layer, an inner ring reinforcing steel bar, a second elastic material layer, a buried type water stop band, a third elastic material layer, an outer ring reinforcing steel bar and an inflatable layer are annularly laid in sequence at the end part of the template trolley towards the surrounding rock. By use of the inflating pressure of the inflatable layer and the elastic characteristics of the multiple elastic material layers, interlayer structures of a plug can be tightly squeezed together, so that the reinforcing steel bars and the water stop band can be exposed out of the plug structure, mold-shut construction is facilitated, staggering of the water stop band is prevented; furthermore, no gap exists in the plug structure, so that slurry leakage during model forming is avoided; meanwhile, no damage to a waterproofing plate below the surrounding rock at the top is caused, and the potential hazard of water leakage of a tunnel can be eliminated.

Description

technical field [0001] The invention relates to the field of tunnel engineering construction equipment, in particular to a plug structure installed between a formwork trolley and surrounding rock and an installation method thereof. Background technique [0002] Highway and railway tunnels are often built using the new Austrian method, and the construction method is as follows: firstly, the top arch is placed, and dry-mixed mortar is sprayed to form a waterproof surrounding rock, and then a secondary lining steel skeleton is preset between the formwork trolley and the waterproof surrounding rock, and finally The secondary lining pouring model is formed between the waterproof surrounding rock, the previously poured secondary lining side (that is, the side of the construction joint) and the formwork trolley by pouring (the longitudinal length of each closing form is about 12 meters). At the side of the secondary lining model to be poured, it is difficult to close the form due t...

AI Technical Summary

Problems solved by technology

On the side of the secondary lining model to be poured, it is difficult to close the formwork due to a large number of vertically exposed steel bars

[0003] Strip planks are usually used to block the axial direction of the ring tunnel. This traditional method has the following problems: (1) For the plug structure laid at the end of the formwork trolley, not only the workload is large (it usually takes four people to lay a circle) 8 hours of work), mold removal is also troublesome, and there is also a problem of heavy workload; (2) The laying process is complicated and troublesome, not only wasting a lot of wood (the reuse rate of wood is low), but also due to the closing effect of wood It is poor, and it is easy to have a large number of holes and leaks, especially where the steel bars are not easy to seal, and other soft materials need to be used to plug the holes in the later stage. Even so, the problem of cement slurry leakage and waste cannot be avoided; (3) Use wooden boards to close For the mold, it is necessary to fold the mid-buried waterstop along the plank so that it can be closed in the mold, so it is easy to cause the misalignment of the position of the waterstop between the adjacent secondary lining pouring models, and the proper waterstop cannot be achieved. Effect; (4) The corners of the board are easy to damage the waterproof board under the waterproof surrounding rock, causing hidden dangers of water leakage in the tunnel

There is also a technical scheme of using steel formwork as the end die plug, but there are defects such as heavy formwork and difficult operation

For example, the utility model patent "A Plug Plate for Tunnel Secondary Lining Formwork Trolley" (Application No.: 201520472105.7) provides a plug plate installed on the formwork trolley, through which the waterstop is fixed and carried out Closing mold is blocked, but the design is complicated, and there is also the problem that it is not easy to bypass the exposed steel bars

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