Pre-stress combined well/tunnel module structure construction method and module structure

Abstract

The invention relates to the field of underground well and tunnel construction, in particular to a pre-stress combined well / tunnel module structure construction method and a module structure, and provides the pre-stress combined well / tunnel module structure construction method and the module structure which aim to reduce tunnel deformation by using a pre-stress inner frame, are relatively small in influence on near buildings, and can lower the cost and accelerate the construction speed due to a one-step molding mode. The pre-stress combined well / tunnel module structure construction method comprises the following steps: a, confirming the total number of modules; b, forming shielding support rings; c, assembling prefabricated lining segments; d, constructing an inner frame structure; e, exerting thrusting force to the inner frame structure so as to form a combined outer lining inner frame system with pre-stress; f, performing pressurized grouting on gaps between underground rock and the prefabricated lining segments so as to form a sealed grouting structure; g, fixing a pre-stress rope anchoring end of a pre-stress rope; and h, repeating the steps, and constructing a next module. The pre-stress combined well / tunnel module structure construction method is particularly applicable to comprehensive underground pipe galleries in modern cities.

Description

technical field [0001] The invention relates to the field of underground shaft and tunnel construction, in particular to a construction method and a modular structure of a prestressed combined type shaft tunnel module structure. Background technique [0002] With the continuous acceleration of the urbanization process in our country, a series of "urban diseases" such as a blowout-like increase in motor vehicles, a sharp drop in urban greening rate, urban waterlogging, and construction pollution have emerged. Questions are important. Construct tunnel space underground in the city, integrate various engineering pipelines such as power, communication, gas, heat supply, water supply and drainage, etc., set up a special monitoring system, and implement unified planning, unified design, unified construction and management, which is a guarantee for the city vital infrastructure to operate. The construction of underground comprehensive pipe gallery can avoid the impact and interfe...

AI Technical Summary

Problems solved by technology

The current underground tunnel structure has the following disadvantages: 1. The construction of shield segments is more suitable for tunnels with circular sections, and the bearing capacity of rectangular shield tunnel segments is poor. At present, the method of assembling multi-layer segments is adopted, and the span is small , within 8 meters

2. The open-cut prefabricated underground structure cannot meet the construction requirements of deep underground tunnels due to the use of open-cut construction, and the scope of use is small, which greatly interferes with surface road traffic

The construction of shield tunneling method or open cut method will cause deformation of the soil around the tunnel, and strict and effective control measures are required, and it is difficult to control the deformation of the tunnel

4. The bearing capacity of the shield segment without internal support is lower than that of the structural system with internal support. At present, the internal support system and the internal partition permanent structure system have not been constructed at the same time, and cannot be formed at one time

5. Long construction time

The cast-in-place method is used to build the permanent structure inside the tunnel. Since the consolidation and hardening of the cast-in-place concrete takes time, the construction period is relatively long.

6. Large construction investment

The method of pouring the internal structure concrete after the traditional tunnel support is used to build underground buildings, and the cost of measures in the construction is relatively high, resulting in a large construction investment

7. The construction process and quality are not easy to control

Due to poor underground construction conditions, it is difficult to control the construction process and quality, and problems are prone to increase the cost and delay the construction period

The above-mentioned shortcomings in the current construction of underground shaft tunnels make the construction of large-span underground tunnels and rectangular tunnels difficult and difficult to promote on a large scale

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