CN112696023A

CN112696023A - Opening-free and formwork-free construction method for cast-in-place beam of assembled integral frame structure

Info

Publication number: CN112696023A
Application number: CN202011547494.7A
Authority: CN
Inventors: 吴晗; 宋千军; 向晓红; 郑鹏; 车其杰
Original assignee: Sixth Construction Co Ltd of China Construction Fourth Engineering Division Co Ltd
Current assignee: Sixth Construction Co Ltd of China Construction Fourth Engineering Division Co Ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-04-23

Abstract

A construction method for a cast-in-place beam of an assembled integral frame structure without opening a hole and a formwork support comprises the following steps: 1) pre-burying a steel plate at the connection part of the side surface of the precast beam and the cast-in-place beam; 2) welding a vertical steel plate on the embedded steel plate; 3) two ends of the cast-in-place beam supporting channel steel are respectively welded to the bottoms of the vertical steel plates on the embedded steel plates on the two sides; 4) laying a square tube back edge on the channel steel, and laying a template on the back edge as a bottom die; 5) placing a precast beam reinforcement cage on the bottom die, and respectively welding two ends of a reinforcement cage bottom rib and a waist rib which are positioned at the position of the pre-vertical steel plate on the vertical steel plate; 6) after the upper reinforcing steel bars of the cast-in-place beam are synchronously bound with the plate ribs and the laminated layer reinforcing steel bars of the precast beam, side molds are supported and fixed on two sides of the cast-in-place beam; 7) synchronously pouring the cast-in-place beam, the precast beam and the slab; 8) and (4) disassembling the side die, the bottom die and the support channel steel. The method is simple to operate, improves the construction efficiency, and can effectively meet the installation operation requirement of a construction site.

Description

Opening-free and formwork-free construction method for cast-in-place beam of assembled integral frame structure

Technical Field

The invention relates to the field of building construction, and particularly belongs to a construction method of a cast-in-place beam of an assembled integral frame structure without opening and a formwork support.

Background

The assembly type integral frame structure system is a trend of large-scale multi-storey logistics factory buildings or storage buildings, and the storey height of the assembly type integral frame structure system generally reaches 10 meters and above. One or more cast-in-place beams are arranged on two sides of the precast beam in the local area due to the requirement of structural function. The common practice in such situations is to leave a large hole in the precast beam during production, so that the cast-in-place beam steel reinforcement framework can penetrate through the hole to be connected with the cast-in-place beam. Or after the hoisting construction of the precast beam is finished, the hole turning machine is adopted to drill holes and then steel bars are planted, and the method is easy to cut off the steel bars at the bottom of the precast beam and leave quality defects. Meanwhile, a support frame with the height of about 10 meters needs to be erected for supporting a platform operated by a worker and a precast beam template during cast-in-place beam construction. The construction process is complicated and the efficiency is low.

The construction difficulty of the cast-in-place beam in the precast beam structure is effectively solved. Simplify the construction operation flow, promote the construction level. The invention particularly relates to a construction method of a cast-in-place beam of an assembled integral frame structure without an opening and a formwork support, which aims to solve the problems.

Disclosure of Invention

The invention aims to provide a construction method of an assembled integral frame structure cast-in-place beam without opening and a formwork. The local cast-in-place beam of the frame structure prefabricated in the high altitude is free from the processes of erecting a support frame, reserving holes on the side surface of the beam, opening holes and the like.

The invention adopts a specific technical scheme to provide a construction method of a cast-in-place beam of an assembled integral frame structure without opening and a formwork support, which comprises the following steps: 1) pre-burying a steel plate at the connection part of the side surface of the precast beam and the cast-in-place beam, and anchoring the pre-buried steel plate and the precast beam; 2) when the cast-in-place beam is constructed, chiseling the surface concrete of the corresponding positions of the side surfaces of the precast beams positioned at the two ends of the cast-in-place beam, and welding a plurality of groups of vertical steel plates which are vertically arranged on the embedded steel plates; 3) welding two ends of the cast-in-place beam supporting channel steel to the bottom of the vertical steel plate on the embedded steel plate respectively; 4) laying a square tube back edge on the channel steel, and laying a template on the back edge as a bottom die; 5) placing a precast beam reinforcement cage on the bottom die, and respectively welding two ends of a reinforcement cage bottom rib and a waist rib which are positioned at the position of the pre-vertical steel plate on the vertical steel plate; 6) after the upper reinforcing steel bars of the cast-in-place beam are synchronously bound with the plate ribs and the laminated layer reinforcing steel bars of the precast beam, side molds are supported and fixed on two sides of the cast-in-place beam; 7) synchronously pouring the cast-in-place beam, the precast beam and the slab; 8) and after the concrete meets the strength requirement, removing the side mold, the bottom mold and the support channel steel.

And (3) welding bent steel bars on the embedded steel plates in the step 1), and anchoring the embedded steel plates and the precast beams into a whole through the bent steel bars.

And in the step 2), the embedded steel plates and the vertical steel plates are connected in a 90-degree right-angle welding mode.

In step 5), the cast-in-place beam stirrup is flush with the top of the precast beam stirrup

According to the invention, the steel plate is embedded in the precast beam, the vertical steel plate is welded on the embedded steel plate, and the channel steel is welded on the embedded steel plate to serve as the bottom support, so that holes are prevented from being formed in the precast beam, and the support frame is erected during beam casting. The construction period is shortened, the supporting pipes required by construction are saved, and the construction quality is improved.

The construction method of the cast-in-place beam of the assembled integral frame structure, which is disclosed by the invention, is free of opening and formwork erection, is simple to operate, and can effectively meet the installation operation requirements of a construction site.

Drawings

Fig. 1 is a schematic structural view of a welded channel.

Fig. 2 is a schematic structural diagram of an embedded steel plate.

Fig. 3, the structural schematic diagram of the precast beam reinforcement cage is placed.

Fig. 4 and a schematic top view of fig. 3.

Fig. 5 is a schematic cross-sectional structure diagram of a joint of a cast-in-place beam steel reinforcement cage and a precast beam embedded steel plate in fig. 3.

Detailed Description

Referring to fig. 1 to 5, the invention provides a construction method for a cast-in-place beam of an assembled integral frame structure without opening a hole and without a formwork support, which comprises the following steps:

firstly, binding reinforcing steel bars of a precast beam 1, then manufacturing an embedded steel plate 2 according to the connection requirement of a cast-in-place beam, and welding a plurality of bent reinforcing steel bars 3 on one surface of the embedded steel plate. According to the position of a cast-in-place beam on a precast beam, two groups of embedded steel plates 2 are respectively embedded at the designated positions on two sides of the precast beam 1 in advance, and the embedded steel plates 2 are fixed on precast beam steel bars through spot welding. And making positioning marks on the size and the position of the embedded steel plate 2. And then performing concrete pouring of the precast beam. During construction, after the precast beam 1 is placed and is completed in construction, construction setting-out is carried out to determine the position of the embedded steel plate 2, concrete on the surfaces of the steel plates 2 on the two sides of the precast beam is chiseled by adopting a chiseling tool, and a plurality of groups of vertical steel plates 4 are welded on the embedded steel plates according to the positions of the steel bars of the precast beam. And respectively welding two ends of a group of channel steel 5 on the rectangular vertical steel plate 4 at the bottom of the embedded steel plate on the precast beam at two ends of the cast-in-place beam to form a bottom support. And a group of steel pipe back ridges 6 are paved on the channel steel at intervals along the length direction of the channel steel, and then bottom formworks 7 are paved. And placing the bound cast-in-place beam reinforcement cage 8 at the construction position of the precast beam on the bottom formwork 7. And (3) welding and fixing the steel bars 9 and the waist bars 10 at the bottom of the end of the precast beam with the vertical steel plate 4. And after the upper reinforcing steel bars of the cast-in-situ beam are synchronously bound with the plate reinforcing steel bars and the laminated layer reinforcing steel bars of the precast beam, side molds are erected on two sides of the cast-in-situ beam and fixed. And pouring is completed synchronously with the precast beam and the precast slab. And (4) removing the side templates, the bottom template and the bottom support after the concrete reaches the strength.

According to the invention, the embedded steel plate and the cast-in-place beam steel bar are welded together, so that the cast-in-place beam and the precast beam form an integral structure, the structural strength is improved, the processes of punching the cast-in-place beam and erecting a formwork are also omitted, and the construction efficiency and the structural quality are improved.

Claims

1. A construction method for a cast-in-place beam of an assembled integral frame structure without opening a hole and a formwork support comprises the following steps: 1) pre-burying a steel plate at the connection part of the side surface of the precast beam and the cast-in-place beam, and anchoring the pre-buried steel plate and the precast beam; 2) when the cast-in-place beam is constructed, chiseling the surface concrete of the corresponding positions of the side surfaces of the precast beams positioned at the two ends of the cast-in-place beam, and welding a plurality of groups of vertical steel plates which are vertically arranged on the embedded steel plates; 3) welding two ends of the cast-in-place beam supporting channel steel to the bottom of the vertical steel plate on the embedded steel plate respectively; 4) laying a square tube back edge on the channel steel, and laying a template on the back edge as a bottom die; 5) placing a precast beam reinforcement cage on the bottom die, and respectively welding two ends of a reinforcement cage bottom rib and a waist rib which are positioned at the position of the pre-vertical steel plate on the vertical steel plate; 6) after the upper reinforcing steel bars of the cast-in-place beam are synchronously bound with the plate ribs and the laminated layer reinforcing steel bars of the precast beam, side molds are supported and fixed on two sides of the cast-in-place beam; 7) synchronously pouring the cast-in-place beam, the precast beam and the slab; 8) and after the concrete meets the strength requirement, removing the side mold, the bottom mold and the support channel steel.

2. The assembly type integral frame structure cast-in-place beam non-perforating and non-formwork construction method as claimed in claim 1, wherein the pre-buried steel plate in step 1) is welded with a bent steel bar, and the pre-buried steel plate is anchored with the precast beam into a whole through the bent steel bar.

3. The assembly type integral frame structure cast-in-place beam non-perforation and formwork support-free construction method according to claim 1, wherein the embedded steel plates and the vertical steel plates in the step 2) are connected in a 90-degree right-angle welding mode.

4. The construction method of the cast-in-place beam of the fabricated integral frame structure without the opening hole and the formwork support as claimed in claim 1, wherein in the step 5), the cast-in-place beam stirrup is flush with the top of the precast beam stirrup.