Construction method of foundation slab in subsurface structure engineering

Abstract

The invention discloses a construction method of a foundation slab in subsurface structure engineering, which comprises the following steps: 1) cutting a pile head of a foundation engineering pile and finishing the pile head of the foundation engineering pile to designed elevation before the construction of the foundation slab; 2) adopting the pile head of the foundation engineering pile as a support point of a truss, forming trusses which are welded with the pile head of the foundation engineering pile respectively in the horizontal direction and the longitudinal direction, wherein all the trusses form a lattice type support frame, the bottom surface elevation and thickness of the support frame should meet thickness requirements on a foundation slab concrete protective layer, the section of each truss is in an inverted triangle shape, the bottom chord of the truss is one of pieces of rebar at the lower layer of the foundation slab, and the upper chords of the truss are two of pieces of rebar at the upper layer of the foundation slab; 3) forming the foundation slab rebar on the support frame; and 4) casting concrete and maintaining. The construction method of the foundation slab in subsurface structure engineering can protect a waterproof layer and ensure the thickness of the foundation slab concrete protective layer, enable the rebar at the upper layer and the rebar at the lower layer of the foundation slab to be bond stably and smoothly, and improve construction safety coefficient.

Description

technical field [0001] The invention relates to a construction method for a foundation bottom plate, in particular to a construction method for an underground structural engineering foundation bottom plate. Background technique [0002] The construction of the base plate of the underground structure engineering mainly includes three parts: waterproof construction, steel bar binding and concrete pouring. The quality of underground waterproof structure directly affects the construction quality of underground structure engineering; its main quality control point is waterproof leakage. Leakage is a common quality problem. For waterproof leakage problems, only corrective, preventive and control measures can be implemented. There are many reasons for the leakage phenomenon, but there are two main reasons. One is the material factor, and the other is the construction process. The material factor is controllable, and the improvement of the construction process becomes the key to th...

AI Technical Summary

Problems solved by technology

Therefore, the leakage of underground waterproofing and the uneven thickness of the concrete protective layer caused by conventional construction techniques have become lifelong quality defects in underground structural engineering.

Furthermore, due to the thick bottom plate of the foundation pit and the heavy weight of the steel bars, the existing binding method will easily cause instability and deformation of the upper and lower double-layer steel bars during binding, and even the phenomenon that the upper layer of steel bars will be toppled over and stacked on the lower layer of steel bars. Great insecurity

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