Formwork system and construction method for the second lining of municipal underground passages

Abstract

The invention discloses a municipal underground channel second lining construction template system and construction method. The municipal underground channel second lining construction template systemcomprises a second lining side wall template group, a second lining top plate template group, a bracket and an axillary angle template group connecting the second lining side wall template group andthe second lining top plate template group. The second lining side wall template group comprises a side wall template and a side wall back edge; the second lining top plate template group comprises atop plate template and a top plate back edge, and the axillary angle template group comprises an axillary angle template and an axillary angle template back edge; and the bracket comprises a pluralityof horizontal rods and a plurality of vertical rods, the vertical rods are arranged between the top plate back edges and second lining bottom plates of second lining in a back shore mode, the horizontal rods are arranged between the side wall back edges of the side walls in a back shore mode, and a door opening is formed in the middle of the bracket. The construction method comprises the steps that original center vertical column profile steel is removed by adopting the mode of removing one every other one; steel bars of second lining side walls and top plates are installed; the template system is constructed; and second lining pouring is poured. According to the municipal underground channel second lining construction template system, scaffolds are not required to be arranged and the door opening for convenient passing is formed, and settlement deformation of an arch top can be controlled by the construction method while the channel space is ensured to be maximized.

Description

technical field [0001] The invention relates to the construction of municipal underground passages, in particular to a formwork system and a construction method for the second lining of municipal underground passages. Background technique [0002] Municipal underground passages have the following characteristics: (1) During the construction of the second lining, the internal support of the primary support needs to be removed, which may cause the settlement of the primary support vault to exceed the limit, so the settlement risk of the primary support vault needs to be resolved. (2) During the construction of the second lining, due to the influence of the internal support of the primary support, the formwork trolley cannot be used, and only the support system can be used. However, after the support system is fully covered, it is inconvenient to reinforce the formwork and pour concrete, so it is necessary to solve the inside of the support traffic problems. (3) The constructi...

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Problems solved by technology

(2) During the construction of the second lining, due to the influence of the internal support of the primary support, the formwork trolley cannot be used, and only the support system can be used. However, after the support system is fully covered, it is inconvenient to reinforce the formwork and pour concrete, so it is necessary to solve the inside of the support access problem

(3) The construction of the second lining needs to be carried out after the initial support of the underground excavation is completed, and the working environment is a fully enclosed space, and vertical hoisting of materials or components cannot be carried out, so the lightweight and operability problems of the formwork system need to be solved

[0003] According to the current construction situation of the same type of project, the above construction problems of the second lining of the municipal underground passage cannot be properly solved

Most of the secondary lining construction of municipal underground passages adopts the full frame and wooden formwork system, but this construction scheme has the following construction defects: (1) Due to the full frame system, it is inconvenient for workers to strengthen the formwork and pour concrete

(2) The wooden formwork has low rigidity and is easy to deform, and the connection between the wooden formwork is not reliable, which is easy to cause wrong platform

At the same time, it is difficult to assemble the designed angle at the joints of the wooden formwork at the armpit corners, which will easily cause the lines to be unsmooth after the concrete is poured.

(3) When pouring concrete, ordinary concrete needs to be cut and vibrated on the surface of the formwork, which will affect the appearance after molding

Or directly vibrate the surface of the formwork, causing the concrete to be vibrated and not dense

(4) When pouring concrete, the pump pipe is directly inserted into the formwork pouring hole, causing the concrete to flow out when the pump pipe is pulled out, resulting in poor concrete pouring of the second lining and waste of concrete

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