Construction method of secondary-lining trolley separated window pouring and pouring structure thereof

Abstract

The invention discloses a construction method of secondary-lining trolley separated window pouring and a pouring structure thereof. A traditional secondary-lining pouring method is abandoned, and pumppipe joints do not need to be frequently disassembled and installed; and the labor consumption and labor cost are reduced, the pipe blocking risk is reduced, and construction safety is improved. Since sub-feed troughs and fixed sliding grooves can be pre-set in advance, reconnection does not need to be carried out in the construction process, and no more cases of which site workers choose only asmall amount of windows for material distribution or concrete sequence-method pouring for convenient construction is achieved, so the appearance quality defects such as material aggregating nests, honeycomb and scale, construction cold joints and gable slopes are well prevented, the workload of post-repair is reduced, and labor costs and construction period and material costs of the post-repair are greatly reduced. Since each row of pouring windows is poured at the same time, the problem that a trolley offsets to form faulting of slab ends caused by the uneven force due to uneven feeding of the secondary-lining trolley is further effectively avoided, and a secondary-lining profile is ensured to be not beyond limit.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction method and a pouring structure for two-lining trolley pouring by windows. Background technique [0002] At present, most of the concrete pouring of domestic tunnel secondary lining formwork trolleys adopts transfer pump tubes for window-by-window pouring or window-jumping pouring. This process requires frequent transfer of pump tubes to other feed windows, and the pump tube must be disassembled as the outlet is transferred. . The specific construction steps are as follows: 1. Pouring of the first row of windows: Before pouring, the pump pipe is spliced ​​from the delivery pump to the trolley, and the elbow joint, pump pipe and delivery hose are used to connect, so that the outlet of the delivery hose enters The first row of feeding windows, when the feeding amount reaches a quarter of the total feeding amount of the first row of windows, transfer the delivery ho...

AI Technical Summary

Problems solved by technology

[0003] This existing pouring method has the following defects: 1. It takes an average of 10 minutes to disassemble and install a single interface of the pump pipe, requiring 4 to 6 people to cooperate with the operation, and another 4 people are required to vibrate the concrete at the same time, and the windows on the second floor and above are Working at heights, it is difficult to disassemble and transport pipe joints, which increases labor costs

If the concrete slump is small, dismantling and transferring the pump pipe for a long time is extremely easy to cause pipe blockage, resulting in waste of concrete, and it is difficult to dredge the pipe, which takes a long time

2. In order to facilitate construction and reduce the dismantling and installation time of pump pipes, workers on site often choose 1 or 2 windows in the same layer of windows for distributing or concrete skip layer pouring during construction, resulting in concentrated concrete distributing and untimely vibration, especially for rings, Longitudinal construction joints are easy to form aggregate nests, honeycomb pockmarks, cold construction joints, "herringbone" slopes and other appearance quality problems, which even affect the structural strength

In addition, the use of fewer windows for feeding materials will easily lead to uneven distribution of concrete, uneven force on the formwork of the second lining trolley, easy to cause the formwork to deviate, affect the contour and headroom of the second lining, and lead to problems such as misplacement of the construction wind.

3. There are many appearance quality problems, and the post-repair process is heavy and difficult, which increases the cost

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