Open-cut tunnel open-type main structure side wall Bailey support formwork and its construction technology

Abstract

The invention provides an open type main structure side wall bailey truss formwork of an open trench tunnel and a construction process thereof. The formwork comprises an outer template and an inner template, and the inner side of the outer template is opposite to the inner side of the inner template; a first bailey truss is arranged on the outer side of the outer template, a second bailey truss is arranged on the outer side of the inner template, and a connecting rod is arranged between the upper portion of the first bailey truss and the upper portion of the second bailey truss; the lower portion of the first bailey truss and the lower portion of the second bailey truss are each provided with a pre-embedded bolt, and the upper portion of the second bailey truss inclines towards the first bailey truss. According to the open type main structure side wall bailey truss formwork, the bailey trusses are used as the supporting system, split bolts are not needed, and the waterproof performance of a wall can be effectively improved; the formwork has the advantages of being high in bearing capacity, high in structure rigidity, long in anti-fatigue life and the like; the adopted bailey trusses are high in rigidity and bearing capacity and capable of ensuring project quality effectively. By the adoption of the bailey truss formwork for construction, under the condition that a construction site is narrow, a smooth construction road can be guaranteed, efficacy is improved, supporting materials also can be saved, and the construction progress is accelerated.

Description

technical field [0001] The invention relates to a construction process for the side wall of the main structure of an open-cut tunnel, in particular to a Bailey support formwork for the side wall of the open-type main structure of an open-cut tunnel and the construction process thereof. Background technique [0002] In the construction of the side wall of the open-cut tunnel structure, the construction of the side wall of the main structure is generally carried out in the form of on-site cast-in-place formwork. In traditional construction techniques, steel pipe brackets are usually used as the force support for the side wall formwork of the main structure. However, with the expansion of the tunnel construction scale, the support form of the traditional steel pipe support is becoming more and more difficult to meet the requirements of the tunnel side wall construction. In some sensitive areas, vertical support is often used for tunnel construction, and the operation space rese...

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Problems solved by technology

However, with the expansion of the tunnel construction scale, the support form of the traditional steel pipe support is becoming more and more difficult to meet the requirements of the tunnel side wall construction. In some sensitive areas, vertical support is often used for tunnel construction, and the operation space reserved for subsequent construction is very narrow, but the erection of steel pipe supports takes up a lot of space, blocking the construction access road, making large construction machinery impassable, and affecting other structural sections Construction progress; ② Due to the increase in the volume of the side wall, the lateral pressure generated during the concrete pouring process is relatively large. ③ At present, China's infrastructure construction has the characteristics of short construction period, heavy tasks, and long lines. The traditional steel pipe support has a large workload of dismantling, which greatly reduces the construction efficiency of the side wall. It is difficult to meet the requirements of China's infrastructure construction at this stage. Requirements for the construction period; ④Limited by the structural characteristics of the steel pipe support form itself, the inner and outer formwork needs to be reinforced by pull bolts, and the pull bolts need to pass through the side wall, which will have a certain impact on the waterproof quality of the structural side wall

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