Narrow-beam transition section steel mould trolley for tunnel and construction method

Abstract

The invention discloses a narrow-beam transition section steel mould trolley for a tunnel and a construction method. The trolley comprises a transition section top mould, wherein crown mould plates of the transition section steel mould trolley are designed in a split type; the mould plates, including transition section top moulds, top mould transition mould plates, lateral top moulds and lateral moulds which are sequentially arranged from top to bottom, are symmetrically distributed about the center of the tunnel; all mould plates are hinged to one another by pin shafts; the lateral top moulds and the lateral moulds are connected with and fixed to a trolley gate frame through multiple groups of support lead screws and a plurality of hydraulic oil cylinders. Transition section concrete is constructed by using the steel mould trolley, side and roof arches are subjected to whole-section pouring molding at a time, so that the construction layering is reduced, the construction procedures are increased, the cost input is reduced. The transition section steel mould trolley has a large steel mould plate structure, so that the joint of the mould plates is reduced, and the concrete construction quality is improved.

Description

technical field [0001] The invention relates to the field of steel formwork trolleys for tunnel construction, in particular to a steel formwork trolley and a construction method for narrow and gradual sections of tunnel bundles. Background technique [0002] The entrance section and exit section of the cavern in underground engineering are usually designed as gradual transition sections in order to meet the hydraulic design parameters of the flow channel, such as the tailwater tunnel of the underground powerhouse. That is, the orifice size gradually changes from a large section to a small section. For the lining concrete of this kind of structure with narrow narrow transition section, the lining construction cannot be carried out by using conventional steel formwork trolley. , the rectangular opening of the side wall is a gradual structure from wide to narrow; the arc formwork of the roof arch of the conventional steel formwork platform has the same radius, and the formwork...

AI Technical Summary

Problems solved by technology

For the lining concrete of this kind of structure with narrow narrow transition section, the lining construction cannot be carried out by using conventional steel formwork trolley. , the rectangular orifice of the side wall is a gradual structure from wide to narrow; the arc formwork of the roof arch of the conventional steel formwork platform has the same radius, and the formwork of the side wall has a uniform opening width, which cannot meet the needs of the lining structure

Second, if a conventional steel formwork trolley is used for construction, the steel formwork trolley after lining cannot be demoulded and walked outside the cave from the only exit of the cavern, that is, the poured transition section, due to the structural constraints of the gradient section. The steel formwork trolley walks into the cave to dismantle it. Due to the limitation of the concrete space in the lined cave, the formwork of the steel mold trolley can only be decomposed and destructively removed. The construction cost is high, the construction period is long, and the construction of other processes in the cave interferes greatly.

The commonly used construction method for the lining of the gradient section is that after the bottom slab is poured, the rectangular opening of the side wall is constructed in layers using large steel formwork, and the top arch is constructed by erecting a support frame and multiple small steel formwork to pour the lining concrete. This method requires a large investment in construction. , The construction period is long, the poured concrete formwork joints are many, and the appearance quality is poor

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