Basement reverse-construction scape post-casting pre-stressed construction method

Abstract

A basement reverse-construction scape post-casting pre-stressed construction method belongs to the technical field of building engineering. In the method, construction of a beam plate of the ground floor is completed at first, and then construction of a beam plate in the first underground layer of the basement is carried out, and finally construction of first underground layer scapes which connect the beam plates in the ground floor and the first underground layer is carried out. The construction method includes the steps of: retaining pouring holes, performing construction seam treatment of chapiters and scapes, establishing scape templates, tightening and pre-stressing opposite-pull screw rods, performing scape concrete pouring, detaching the templates and maintaining the scapes, and removing hornlike mouth of the chapiters. The construction method greatly simplifies pouring and tamping construction and the concrete can be delivered from the top board of the ground floor to the pillars in the first underground layer of the basement directly, wherein the pouring and tamping construction starts during transportation, so that the method saves time and labor, and solves a problem that the concrete needs to lift up to the beam plate on the first underground layer with a tower crane. The method greatly increases pouring and tamping construction speed of the scape, reduces construction time, has excellent promoting effect, and is suitable for engineering of secondary pouring and tamping the scapes in a basement through the reverse construction.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a post-pouring and preloading construction method of post-casting and post-compression columns in a basement, which not only facilitates on-site construction, but also improves the compactness of the joint between old and new concrete. Background technique [0002] At present, there are four commonly used construction methods for pouring concrete behind the columns of the upside-down method in the basement, namely, the funnel injection method, the multiple vibration method, the casing pouring method, and the filling method, among which the funnel injection method is the most widely used method, but the three most notable disadvantages of this method are: [0003] 1) In the traditional funnel mouth pressure injection method, the inclination angle of the funnel inclined plate is between 20° and 30°. If the inclination angle is set too small, the followi...

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Problems solved by technology

[0003] 1) In the traditional funnel mouth pressure injection method, the inclination angle of the funnel inclined plate is between 20° and 30°. If the inclination angle is set too small, the following two problems will occur: one is that the mouth of the funnel is too large, and the funnel to be removed later The volume of concrete is large; the second is that the structural reaction force provided by the inclined plate has an unscientific and reasonable effect on the compactness of the contact surface between old and new concrete when pouring concrete;

[0004] 2) There are the following disadvantages in the traditional funnel mouth pressure injection method: first, there is no preloading measure for the concrete by the inclined plate; second, there is no theoretical basis for the size setting of the funnel mouth, and there is great subjective arbitrariness;

[0005] 3) There are certain defects in the traditional concrete pouring and tamping method of the funnel mouth pressure injection method. Due to the existence of the lattice column at the position of the column core and the setting of the column stirrup, it is difficult to vibrate the newly poured concrete fully and densely during pouring and tamping

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