Method for forming reserved hole

Abstract

The invention relates to a method for forming a reserved hole. The method for forming the reserved hole sequentially comprises the following steps of making of a fixed press rod, a tapping screw tap with the diameter ranging from 4 to 6 is chosen, the tapping screw tap and a rebar with the diameter ranging from 6 to 8 are welded together in a butt joint manner, a short rebar with the diameter of 6is welded to the upper part of the rebar with the diameter ranging from 6 to 8 to serve as a transverse press rod, and a short rebar is welded to the top end of the rebar with the diameter ranging from 6 to 8 to serve as a turning wrench; second, making of a square wood press plate, an on-site multi-layer wood patter composite board with the thickness of 15 millimeters is adopted, it is suitablethat the side length of the press plate is 50 millimeters longer than the diameter of a PVC pipe, and a round hole with the diameter ranging from 20 millimeters to 30 millimeters is drilled in the center of the press plate; and third, making of the short PVC pipe, wherein the solid wall PVC pipe is chosen, it is suitable that the diameter of the PVC pipe is 40 millimeters to 50 millimeters largerthan the diameter of an installed pipeline, and the length of the short PVC pipe is determined according to the thickness of a cast-in-place concrete floor. According to the method for forming a reserved hole, reserved holes in the cast-in-place concrete floor are formed in the reserved manner by using press rod fixing formworks, the problem that a reserved hole displaces or deforms is effectivelysolved, and the reserved holes are accurate in position, and are formed smoothly and attractively.

Description

technical field [0001] The invention relates to a method for reserving holes, and belongs to the technical field of building construction. Background technique [0002] In the kitchen, bathroom and pipeline wells in construction projects, it is often necessary to reserve circular holes of different diameters on the cast-in-place concrete floor for vertical pipelines. At present, there are two commonly used methods for reserving holes. One is to cut short PVC pipes of corresponding diameters, and temporarily fix the short PVC pipes around the pipe wall with steel nails after the floor is molded; the other is to cut the short PVC pipes in the middle. After seaming, it is reserved in the concrete slab for one-time use. Among them, the first method is that the short PVC pipe can be reused, but it is not conducive to firm fixation, and it is often displaced during concrete vibration, and the reserved holes are formed irregularly. The second method is a waste of pipe material, a...

AI Technical Summary

Problems solved by technology

Among them, in the first method, the short PVC pipe can be reused, but it is not conducive to firm fixation, and it is often displaced during concrete vibration, and the reserved holes are formed irregularly

The second method is a waste of pipe materials, and it takes a lot of labor to remove the short PVC pipe, which is unreasonable economically