CN103850363B - Construction method of prefabricated through-hole assembled reinforced concrete shear wall - Google Patents

Abstract

The construction method of the prefabricated through hole assembly type reinforced concrete shear wall comprises the steps that a plurality of vertical through holes are formed in a wall body, a plurality of movably connected vertical reinforcing steel bars are arranged in each through hole, the upper ends of the vertical reinforcing steel bars are higher than the wall body, the lower ends of the vertical reinforcing steel bars are connected with reinforcing steel bars of a lower layer of shear wall, and supporting legs are arranged at the bottom end of the wall body. Because the vertical steel bars are movably connected in the through holes of the shear walls, and the joint positions are adjustable along the vertical direction when the steel bars of the upper and lower layers of shear walls are connected, the joint positions of the adjacent vertical steel bars can be conveniently ensured to be staggered, the installation quality of the joint accords with the relevant national standard, the steel bar connection and the concrete pouring in the through holes can be constructed according to the traditional cast-in-place reinforced concrete process, the construction difficulty is reduced, and the engineering quality is improved.

Description

Construction method of prefabricated through-hole assembled reinforced concrete shear wall

technical field

The invention provides a construction method of a prefabricated through-hole assembled reinforced concrete shear wall.

Background technique

In the past, the prefabricated solid prefabricated reinforced concrete shear wall, the sleeves connected with the reinforcement of the lower shear wall are all pre-buried at the bottom of the upper shear wall, so the vertical reinforcement of the upper and lower floors are all grouted with sleeves at the same level connection, whose structure cannot meet the relevant provisions in the current national technical specifications and standards:

1. Article 8.4.7 of "Code for Design of Concrete Structures GB50010--2010" "The mechanical connection joints of longitudinally stressed steel bars should be staggered from each other", "The area percentage of longitudinally tensioned steel bar joints located in the same connection section should not be greater than 50%" .

2. Paragraph 4 of Article 11.1.7 of "Code for Design of Concrete Structures GB50010--2010" "The connection joints of longitudinally stressed steel bars should avoid the encrypted area of the beam end and column end stirrup; if it is necessary to connect here, mechanical connection should be used or welded”, paragraph 5 “The percentage of the joint area of the longitudinally stressed steel bars of the concrete members located in the same connection section should not exceed 50%”.

3. Item 3 of Article 7.2.20 of "Technical Regulations for Design of Concrete Structures of High-Rise Buildings JGJ3--2010" "The connection and anchorage requirements of longitudinal steel bars in concealed columns and end columns should be the same as those of frame columns, and should comply with the relevant requirements in Section 6.5 of this regulation." Regulation".

4. Paragraph 5 of Article 6.5.3 of "Technical Regulations for Design of Concrete Structures of High-Rise Buildings JGJ3--2010" "The area percentage of the tensioned steel joints located in the same connection section should not exceed 50%", and Paragraph 6 "When the joint position cannot When avoiding the dense area of stirrups at the beam end and column end, mechanical connection joints that meet the requirements of equal strength should be used, and the area percentage of the steel bar joints should not exceed 50%.

In the past, during the construction process of prefabricated solid prefabricated reinforced concrete shear walls, the lower shear walls were installed first, and after the beam-slab horizontal system process was completed, the sleeves of the upper shear walls and the lower shear walls were separated from the beams and slabs. The reserved steel bars protruding from the upper surface are connected, and the quality control error is within the range of millimeters, which requires high precision. However, in the actual construction process, it is inevitable that the prefabricated The steel bars reserved for the shear wall cause disturbances, resulting in deformation of the steel bars and contamination of the concrete. Therefore, before the upper and lower shear walls are connected, it is necessary to check the steel bars one by one and correct and detect the deformed steel bars. The most important thing is high-efficiency grouting material, and the unqualified steel bars contaminated with concrete must be processed, which not only increases the workload, but also makes the construction difficult. It requires high technical level of workers, which makes the installation quality control more difficult.

Contents of the invention

The purpose of the present invention is to provide a construction method of a prefabricated through-hole assembled reinforced concrete shear wall, using the shear wall of this technology and its construction method, when the vertical reinforcement of the upper and lower shear walls is connected, it can be convenient The positions of adjacent vertical steel bar joints are staggered, which reduces the construction difficulty of the prefabricated shear wall and improves the quality of the project.

The technical scheme of the present invention is: a prefabricated through-hole assembled reinforced concrete shear wall, with a reinforced concrete wall, characterized in that: the wall is provided with a number of vertical through holes, and each through hole is respectively equipped with a number of The vertical steel bar of active connection, the upper end of the vertical steel bar is higher than the wall body, and the lower end of the vertical steel bar is connected with the steel bar of the lower shear wall. The bottom of the wall is provided with feet.

The construction method of the prefabricated through-hole assembled reinforced concrete shear wall is characterized in that it includes the following steps:

The first step: make the wall components of the prefabricated through-hole assembled reinforced concrete shear wall;

Step Two: Assembly:

①. First, hoist the wall components of the shear wall to the installation position above the lower shear wall, put the vertical steel bars into the through holes of the shear wall wall components, and overlap the lower ends of the vertical steel bars with the lower shear wall steel bars Or mechanical connection or welding, or the lower end of the vertical reinforcement is first lapped or mechanically connected or welded with the lower shear wall reinforcement, and then the vertical reinforcement is placed into the through hole of the shear wall member after connection;

②. For wall components with feet, fix the supporting formwork on both sides of the cavity formed by the feet at the bottom of the wall; for wall components without feet, go directly to the next step;

③. Pour concrete from the upper end of the through hole into the through hole to solidify into a wall.

The advantages of the present invention are: during installation, since the vertical steel bars are movably connected in the through holes of the shear walls, when the steel bars of the upper and lower layer shear walls are connected, the position of the joints can be adjusted up and down in the vertical direction, so it can be conveniently Ensure that the positions of adjacent vertical steel joints are staggered to ensure that their installation quality meets the relevant national standards. The steel bar connection and concrete pouring in the through hole can be constructed according to the traditional cast-in-place reinforced concrete process, which is lower than the previous construction method. Reduce the difficulty of construction and improve the quality of the project. The previous construction method is to pour high-efficiency grouting material into the sleeve. The grouting material requires no concrete residue on the steel bars, and it is necessary to check and clean the steel bars one by one.

Description of drawings

Fig. 1 is the structural representation of prefabricated through-hole assembly type reinforced concrete shear wall of the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 the wall member schematic diagram of the prefabricated through-hole assembly type reinforced concrete shear wall of the present invention;

Fig. 4 is the A-A sectional view of Fig. 3;

Fig. 5 is the schematic diagram of the cast-in-place concrete position of the prefabricated through-hole assembled reinforced concrete shear wall of the present invention;

Fig. 6 is a schematic diagram of the cross-sectional shape of the through hole of the prefabricated through hole assembled reinforced concrete shear wall of the present invention;

Fig. 7 is the solution schematic diagram of the opening end of the prefabricated through-hole assembled reinforced concrete shear wall of the present invention and the cast-in-place end to the opening and the cast-in-place node;

Fig. 8 is a schematic diagram of the vertical reinforcement connection of the prefabricated through-hole assembled reinforced concrete shear wall of the present invention;

The vertical reinforcement connection schematic diagram of the prior art reinforced concrete shear wall of Fig. 9;

Fig. 10 is the schematic diagram of prior art prefabricated solid prefabricated reinforced concrete shear wall;

Fig. 11 is a B-B sectional view of Fig. 10 .

In the figure, 1 wall, 2 through holes, 3 vertical reinforcement, 4 tie reinforcement, 5 horizontal reinforcement, 6 joint, 7 foot, 8 beam plate, 9 lower shear wall, 10 cavity, 11 lower shear wall Steel bars, 12 openings, 13 in-line cast-in-place joints, 14L-shaped cast-in-place joints, 15 cross-shaped cast-in-place joints, 16T-shaped cast-in-place joints, and 17 existing technology shear walls.

Detailed ways

The prefabricated through-hole assembled reinforced concrete shear wall has a reinforced concrete wall 1, as shown in Figure 4, the horizontal steel bars 5 in the wall reinforcement extend to the outside of the wall, and the overhanging part of the horizontal steel bar is used to connect with the adjacent The cast-in-place joint reinforcement between the shear walls is used, and several vertical through-holes 2 are arranged in the wall, as shown in Figure 6, the cross-section of the through-holes can be a perfect circle, an ellipse, a rounded rectangle Such as single shape, also can be the combined figure of above-mentioned shape, in each through-hole, the vertical reinforcing bar 3 that several movable connections are housed respectively, each vertical reinforcing bar is fixedly connected by tie reinforcing bar 4, and the upper end of vertical reinforcing bar is higher than wall body, the lower end of the vertical steel bar in the through hole of the upper shear wall wall member is connected with the steel bar 11 of the lower shear wall, and the connection method adopts the lap joint or mechanical connection or welding mode commonly used in construction engineering.

The bottom of the wall is provided with feet 7 . The supporting foot can make the wall and the beam slab leave a cavity 10 at the bottom of the wall. After pouring concrete into the through hole, the cavity at the bottom of the wall can be used as a position for visual inspection, which is convenient for checking the quality of the cast-in-place concrete;

The construction method of the prefabricated through-hole assembled reinforced concrete shear wall comprises the following steps:

Step 1: Make the wall components of the prefabricated through-hole assembled reinforced concrete shear wall; the horizontal reinforcement in the wall components meets the design requirements of the shear wall structure. After installation, the horizontal main reinforcement in the components does not need to be additionally configured. The results of reinforcement checking and calculation can meet the requirements of component hoisting, storage, transportation and other conditions;

Step Two: Assembly:

1. First hoist the wall components of the shear wall to the installation position, put the vertical steel bars into the through holes of the shear wall wall components, and lap or mechanically connect or weld the lower ends of the vertical steel bars with the lower shear wall steel bars Another method is: the lower end of the vertical reinforcement is first lapped or mechanically connected or welded with the lower shear wall reinforcement, and then the vertical reinforcement is placed in the through hole of the shear wall member;

2. For wall components with feet, fix the supporting formwork on both sides of the cavity 10 formed by the feet at the bottom of the wall to prevent concrete overflow; for wall components without feet, go directly to the next step;

3. Pour concrete from the upper end of the through hole into the through hole to solidify into a wall.

When connecting the reinforcing bars in the through holes with the reinforcing bars protruding from the beam plate 8 of the lower shear wall 9, the joint 6 can be selected within the vertical range of the vertical reinforcing bars to ensure that the adjacent groups of vertical reinforcing bars are The positions of the connectors are staggered to meet the requirements of the current national technical specifications and standards, so that the structural performance is reliable. At the same time, components such as threading pipes can also be laid in the through hole, and the function is flexible and applicable. The reinforcement connection and concrete pouring in the through hole can be constructed according to the traditional cast-in-place reinforced concrete process, which reduces the construction difficulty and makes the quality easy to control.

The horizontal end of the prefabricated through-hole assembled reinforced concrete shear wall (hereinafter referred to as the shear wall) of the present invention provides two schemes, that is, the cast-in-place end at the end adjacent to the wall of the shear wall and the cast-in-place joint The hole end of the adjacent end of the hole 12:

The cast-in-place end is used to connect with the cast-in-place node. The cast-in-place joint is the same as the structure of the existing technology. The horizontal steel bars reserved for the adjacent two sets of shear walls are added to the reinforcement and then the joint is poured. As shown in Fig. Overall installation and construction requirements for cast-in-place joint 14, T-shaped cast-in-place joint 15, and cross-shaped cast-in-place joint 16.

The opening end is solid concrete, and the vertical reinforcement connection of the upper and lower shear walls is connected by sleeve grouting. After installation, the vertical reinforcement at the opening end of the component does not need to be configured separately; when the shear wall has an opening end during installation, high precision is required Only the vertical reinforcement at the hole end is calibrated. Compared with the high-precision correction of all vertical reinforcement in the previous technology, the workload is reduced, the construction difficulty is reduced, and the quality becomes easy to control.

The vertical reinforcement at the non-opening end is the above-mentioned vertical reinforcement, which can meet the design requirements of the shear wall structure. The vertical reinforcement and its tie reinforcement are arranged in the cavity of the prefabricated component. The connection of the reinforcement can be lap joint or mechanical connection. Or welding, to meet the current national technical specifications and standards on the staggered position of the steel joints and the area ratio requirements.

At the same time, the shear wall of this technology has a through hole, so the self-weight is reduced. Assuming that the shear wall is 1.8 meters long, 0.2 meters thick, and 2.5 meters high, its self-weight is 2.25 tons; The hoisting capacity of cranes commonly used in all cast-in-place construction projects is difficult to meet the requirements. To complete the construction of such projects, it is necessary to separately purchase cranes with greater hoisting capacity and increase investment. And the prefabricated through-hole assembled reinforced concrete shear wall of the present invention of the same size has nine holes in a perfect circle, the lower end has a foot, the diameter of the through hole is 140mm, the foot width at both ends is 130mm, and the foot height is 100mm. The self-weight is 1.31 tons, which is only 58% of the self-weight of solid components, which can reduce the hoisting cost.

The prefabricated through-hole assembled reinforced concrete shear wall of the present invention has a wide range of applications, and is suitable for high-rise buildings with shear wall structures, small high-rise buildings and multi-storey buildings with short-leg shear wall structures, and is in line with the direction of industrialization development and is practical. powerful.

Claims (2)

1. The construction method of prefabricated through-hole assembled reinforced concrete shear wall is characterized in that, comprises the following steps: The first step: making a wall member (1) of a prefabricated through-hole assembled reinforced concrete shear wall; the wall member (1) is provided with several vertical through-holes (2); Step Two: Assembly: ①. First, hoist the wall member (1) of the shear wall to the installation position above the lower shear wall, and install several vertical steel bars (3) that are movable connected into the channel of the wall member (1) of the shear wall. In the hole (2); ensure that the upper end of the vertical reinforcement (3) is higher than the wall member (1), and the lower end of the vertical reinforcement (3) is connected with the reinforcement of the lower shear wall; the connection method includes: vertical reinforcement (3) ) and the lower end of the lower shear wall are lapped or mechanically connected or welded, or the lower end of the vertical reinforcement (3) is first lapped or mechanically connected or welded to the lower end of the lower shear wall, and then the vertical (3) put it in the through hole (2) of the shear wall body member (1); ② pour concrete from the upper end of the through hole (2) into the through hole (2), and solidify into a wall. 2. The construction method of prefabricated through-hole assembled reinforced concrete shear wall according to claim 1, characterized in that, the bottom end of the wall member (1) is provided with a foot (7), before step 2. It also includes fixing support templates on both sides of the cavity (10) formed by the feet (7) at the bottom end of the wall body member (1).