Inverted arch filling forming formwork and construction method thereof

Abstract

The invention discloses an inverted arch filling forming formwork. The inverted arch filling forming formwork comprises a center groove formwork, two side formworks arranged in parallel along the two sides of a tunnel and an inverted arch middle formwork located between the two side formworks; each side formwork is provided with a first longitudinal rail arranged in the longitudinal depth direction of the tunnel; the inverted arch middle formwork is arranged on the first longitudinal rails of the side formworks in a sliding mode; overturning formworks used for being matched with the inverted arch middle formwork are hinged to the side formworks, and overturning mechanisms are arranged between the overturning formworks and the side formworks; and filling and plastering formworks are arranged between the center groove formwork and the two side formworks in a sliding mode. The invention further discloses a construction method of the inverted arch filling forming formwork. The construction method comprises the steps that inverted arch forming areas on the two sides of the tunnel are formed; a middle inverted arch forming area is formed; an inverted arch layer is poured; the surface of the inverted arch layer is processed; the filling layer is poured; and the surface of the filling layer is processed. The inverted arch filling forming formwork and the construction method thereof have the advantages that occupation of a longitudinal working interval is reduced, and construction convenience and construction efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an inverted arch filling molding template and a construction method thereof. Background technique [0002] In recent years, with the continuous development of tunnel construction technology in our country, in order to effectively improve the stability and durability of the inverted arch structure, a new understanding of the requirements for inverted arch construction has been obtained. The formwork for inverted arch construction is first optimized from a simple single block formwork to an integral low side wall inverted arch formwork driven by a trestle bridge, and then to a full-width inverted arch formwork with a full inverted arch section formwork. The tunnel invert layer is constructed with a full-width invert formwork, which increases the cost of the formwork and further reduces the construction space for the invert. During pouring, the invert layer is below the ...

AI Technical Summary

Problems solved by technology

The tunnel invert layer is constructed with a full-width invert formwork, which increases the cost of the formwork and further reduces the construction space of the invert. During pouring, the invert layer is below the formwork and can only be poured and vibrated through the working window. Can't fully vibrate

In actual construction applications, air bubbles are easy to form on the surface of the final inverted arch concrete, and the layout of the full-width inverted arch formwork cannot be used for the original slurry plastering and timely secondary cleaning on the surface of the inverted arch layer. The air bubbles affect the appearance of the inverted arch layer. , but also with certain security risks

[0003] In tunnels suitable for filling construction, especially in tunnels with central ditch filling construction, the inverted arch formwork cannot avoid the filling construction in the same longitudinal working area. Two working sections put forward higher requirements on the trestle above the inverted arch, and the increased working section has a greater impact on the longitudinal construction space

Moreover, the corner of the inverted arch layer is not convenient for plastering, resulting in poor molding effect; the integral filling formwork cannot be plastered and formed separately according to the filling construction progress on both sides of the central ditch formwork

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