阅读说明：本技术 地下室墙柱节点不同强度等级砼浇筑的质量控制方法 (Quality control method for pouring concrete of different strength grades of basement wall column node ) 是由 饶武斌 黄平 周曹国 张超 危驰 黄一帆 陈连健 张�杰 于 2020-12-21 设计创作，主要内容包括：本发明涉及一种地下室墙柱节点不同强度等级砼浇筑的质量控制方法,步骤一：制定专项指导书,现场进行交底；步骤二：采用简易收口网对高低强度等级砼分隔：选择快易收口网；根据剪力墙尺寸进行切割；用钢筋作为竖楞；钢筋间距300mm作为横楞；绑扎剪力墙钢筋,剪力墙水平钢筋穿过快易收口网网眼格孔；安装墙柱模板,采用钉子将快易收口网两侧端头固定在墙模和柱模上；步骤三：高低强度等级砼同步浇筑；本发明确保即使墙柱节点处混凝土等级相差2个强度等级的情况下,也能保证墙柱节点处无冷缝、无裂缝、混凝土强度满足设计要求。(The invention relates to a quality control method for pouring concrete of different strength grades of basement wall column nodes, which comprises the following steps: making a special instruction book, and performing scene transaction; step two: separating the high-strength concrete and the low-strength concrete by adopting a simple closing net: selecting a quick and easy closing net; cutting according to the size of the shear wall; using a steel bar as a vertical edge; the distance between the steel bars is 300mm and is used as a transverse edge; binding shear wall reinforcing steel bars, wherein horizontal reinforcing steel bars of the shear wall penetrate through the mesh grid holes of the quick and easy closing net; installing wall column templates, and fixing the ends at the two sides of the fast and easy closing net on the wall mold and the column mold by nails; step three: synchronously pouring high-strength and low-strength concrete; the invention can ensure that no cold joint and no crack exist at the wall column node and the concrete strength meets the design requirement even if the concrete grades at the wall column node are different by 2 strength grades.)

1. A quality control method for pouring concrete of different strength grades of basement wall column nodes is characterized by comprising the following steps:

the method comprises the following steps: making a special instruction book, and performing background matching on the spot:

in order to avoid error, a project technical responsible person trains workers with insufficient experience and unskilled operation, and makes a corresponding special instruction book according to the current situation of the workers, the special instruction book is used as a construction standard, the workers are handed over layer by layer, and the workers are examined regularly, so that the condition of the workers can be known conveniently;

step two: separating the high-strength concrete and the low-strength concrete by adopting a simple closing net:

2.1, selecting materials, namely a fast and easy closing net;

2.2, cutting according to the size of the shear wall;

2.3, using a steel bar as a vertical ridge;

2.4, using the steel bar space of 300mm as a transverse ridge;

2.5, binding shear wall reinforcing steel bars, wherein horizontal reinforcing steel bars of the shear wall penetrate through the mesh grid holes of the fast and easy closing net;

2.6, installing wall column templates, and fixing the end heads at the two sides of the quick and easy closing net on the wall mold and the column mold by using nails;

step three: synchronously pouring high-low strength grade concrete:

3.1, before concrete pouring, carrying out technical background crossing on the site by project managers, organizing workers to carry out implementation by the project managers, pouring the high-strength and low-strength grade wall column node concrete simultaneously, organizing two classes of operators, and commanding one class of operators by the site managers respectively;

3.2, respectively feeding and pouring high and low strength grades by using a concrete conveying pump, wherein the compactness of the concrete interface of the high and low strength grades is increased by adopting secondary vibration on the concrete;

3.3, controlling the transportation rhythm of the concrete and the flow of the concrete on site, and keeping the wall column concrete on a horizontal plane all the time until the concrete is fully poured;

3.4, when only one concrete delivery pump is used without the condition on site, firstly pouring high-grade concrete, controlling the pouring height to be about 1.5 m to prevent the simple closing-up net from bearing failure and breaking, then pouring low-grade concrete, wherein the pouring height is consistent with that of the high-grade concrete, and pouring the high-grade concrete until the high-grade concrete is fully poured;

3.5, each pouring implementation is guided by the on-site tracking of the group members, and the quality inspectors perform tracking inspection to ensure that the high-strength and low-strength concrete is poured synchronously and vibrated compactly.

Technical Field

The invention relates to the technical field of construction of building basements, in particular to a quality control method for pouring concrete of wall column nodes of basements in different strength grades.

Background

When the basement outer wall is constructed, dense mesh steel wire meshes are mostly adopted for separating concrete pouring, and the concrete pouring is carried out at the joint of the column and the shear wall by adopting the dense mesh steel wire meshes in the construction process, and the longitudinal height of the concrete pouring reaches 6m, so that the lateral impact force and the pressure on the dense mesh steel wire meshes are large in the concrete pouring and vibrating process, the dense mesh steel wire meshes cannot be guaranteed not to be pressed to cause deformation and damage, the effective separation effect cannot be achieved, and the concrete construction quality cannot be guaranteed. Meanwhile, even if the strength of the columns at the nodes of the wall columns can meet the design requirements, the grade of the shear wall concrete has the strength exceeding the design requirements, so that the waste of materials and the increase of engineering cost are caused; in addition, there is a risk that the basement will leak due to the crack problem.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a quality control method for pouring concrete of different strength grades of basement wall column joints, and solves the problem that the construction quality of the concrete is not ensured due to the compression damage of a dense mesh steel wire mesh.

In order to solve the technical problem, the invention is realized as follows:

a quality control method for pouring concrete of different strength grades of basement wall column nodes is characterized by comprising the following steps:

the method comprises the following steps: making a special instruction book, and performing background matching on the spot:

in order to avoid error, a project technical responsible person trains workers with insufficient experience and unskilled operation, and makes a corresponding special instruction book according to the current situation of the workers, the special instruction book is used as a construction standard, the workers are handed over layer by layer, and the workers are examined regularly, so that the condition of the workers can be known conveniently;

step two: separating the high-strength concrete and the low-strength concrete by adopting a simple closing net:

2.1, selecting materials, namely a fast and easy closing net;

2.2, cutting according to the size of the shear wall;

2.3, using a steel bar as a vertical ridge;

2.4, using the steel bar space of 300mm as a transverse ridge;

2.5, binding shear wall reinforcing steel bars, wherein horizontal reinforcing steel bars of the shear wall penetrate through the mesh grid holes of the fast and easy closing net;

2.6, installing wall column templates, and fixing the end heads at the two sides of the quick and easy closing net on the wall mold and the column mold by using nails;

step three: synchronously pouring high-low strength grade concrete:

3.1, before concrete pouring, carrying out technical background crossing on the site by project managers, organizing workers to carry out implementation by the project managers, pouring the high-strength and low-strength grade wall column node concrete simultaneously, organizing two classes of operators, and commanding one class of operators by the site managers respectively;

3.2, respectively feeding and pouring high and low strength grades by using a concrete conveying pump, wherein the compactness of the concrete interface of the high and low strength grades is increased by adopting secondary vibration on the concrete;

3.3, controlling the transportation rhythm of the concrete and the flow of the concrete on site, and keeping the wall column concrete on a horizontal plane all the time until the concrete is fully poured;

3.4, when only one concrete delivery pump is used without the condition on site, firstly pouring high-grade concrete, controlling the pouring height to be about 1.5 m to prevent the simple closing-up net from bearing failure and breaking, then pouring low-grade concrete, wherein the pouring height is consistent with that of the high-grade concrete, and pouring the high-grade concrete until the high-grade concrete is fully poured;

3.5, each pouring implementation is guided by the on-site tracking of the group members, and the quality inspectors perform tracking inspection to ensure that the high-strength and low-strength concrete is poured synchronously and vibrated compactly.

The invention has the beneficial effects that: the fast and easy closing net is used to combine the concrete with different strength grades into a firm whole and prevent leakage, and the damage of the structure caused by the shock of chiseling and roughening is avoided. And the fast and easy closing net is left on the surface layer after concrete is poured, so that the reinforcing effect can be achieved, and the concrete surface layer is prevented from being dried and shrunk and cracks caused by humidity shrinkage are prevented.

Drawings

The invention is described in further detail below with reference to the following figures and embodiments:

figure 1 is a schematic view of the installation of a closing net.

Detailed Description

As shown in fig. 1: a quality control method for pouring concrete of different strength grades of basement wall column nodes comprises the following steps:

the method comprises the following steps: making a special instruction book, and performing background matching on the spot:

in order to avoid error, a project technical responsible person trains workers with insufficient experience and unskilled operation, and makes a corresponding special instruction book according to the current situation of the workers, the special instruction book is used as a construction standard, the workers are handed over layer by layer, and the workers are examined regularly, so that the condition of the workers can be known conveniently;

step two: separating the high-strength concrete and the low-strength concrete by adopting a simple closing net:

2.1, selecting materials, namely a fast and easy closing net;

2.2, cutting according to the size of the shear wall;

2.3, using a steel bar with the diameter of 16 as a vertical ridge 2;

2.4, the distance between the steel bars with the diameter of 12 mm is 300mm to be used as a transverse ridge 1;

2.5, binding shear wall reinforcing steel bars, and enabling the shear wall horizontal reinforcing steel bars 3 to penetrate through the mesh grid holes of the fast and easy closing net;

2.6, installing wall column templates, and fixing the end heads at the two sides of the fast and easy closing net on the wall mold and the column mold by using nails 4;

step three: synchronously pouring high-low strength grade concrete:

3.1, before concrete pouring, carrying out technical background crossing on the site by project managers, organizing workers to carry out implementation by the project managers, pouring the high-strength and low-strength grade wall column node concrete simultaneously, organizing two classes of operators, and commanding one class of operators by the site managers respectively;

3.2, respectively feeding and pouring high and low strength grades by using a concrete conveying pump, wherein the compactness of the concrete interface of the high and low strength grades is increased by adopting secondary vibration on the concrete;

3.3, controlling the transportation rhythm of the concrete and the flow of the concrete on site, and keeping the wall column concrete on a horizontal plane all the time until the concrete is fully poured;

3.4, when only one concrete delivery pump is used without the condition on site, firstly pouring high-grade concrete, controlling the pouring height to be about 1.5 m to prevent the simple closing-up net from bearing failure and breaking, then pouring low-grade concrete, wherein the pouring height is consistent with that of the high-grade concrete, and pouring the high-grade concrete until the high-grade concrete is fully poured;

3.5, each pouring implementation is guided by the on-site tracking of the group members, and the quality inspectors perform tracking inspection to ensure that the high-strength and low-strength concrete is poured synchronously and vibrated compactly.