CN106760054A - Precast reinforced concrete shear wall - Google Patents

Abstract

The present invention provides a prefabricated reinforced concrete shear wall, comprising an upper shear wall and a lower shear wall, the upper shear wall is embedded with a socket, and the lower shear wall is embedded with a profile, the profile is adapted to penetrate into the socket and grouted in the socket so that the upper shear wall and the lower shear wall are connected to each other. The invention improves the "distributed connection mode" of steel bars to the "centralized connection mode" of section steel to solve the problems of difficult insertion and alignment of steel bars, and further improves construction connection efficiency.

Description

Prefabricated reinforced concrete shear walls

technical field

The invention belongs to the technical field of construction engineering, and in particular relates to a prefabricated reinforced concrete shear wall.

Background technique

Compared with cast-in-place concrete structures, prefabricated prefabricated concrete structures have the characteristics of low resource consumption, low environmental impact, high labor productivity, and significant economic and social benefits. It is the development direction of my country's current construction industrialization. Like cast-in-place shear wall structure and frame-shear wall, prefabricated shear wall structure is suitable for high-rise residential buildings, while prefabricated frame-shear wall is suitable for office and shopping malls. For the horizontal joints of prefabricated shear walls, two key technical issues need to be solved: vertical reinforcement connection and horizontal joint connection.

At present, the mainstream horizontal joint connection technologies of prefabricated concrete shear walls in my country include: steel sleeve grouting connection, steel metal bellows grout-anchor lap joint, spiral stirrup constrained steel bar grout-anchor lap joint, steel bar anchored in laminated plate type Walls and more.

Considering the current level of construction technology and the quality of employees in our country, there have always been problems in the insertion and alignment of steel bars during construction. Generally, in practice, the improvement method of "long wall pier → segmented short wall pier, thin steel bar → thick steel bar, double row bar → single row bar" is often adopted. However, this approach inevitably brings a series of technical defects such as increasing cast-in-place vertical joints, reducing construction efficiency, and losing out-of-plane rigidity of the wall. Moreover, even for the common wall plinths of about 3 meters without end concealed columns, there are still about 8 vertical steel bars. If end concealed columns are included, the number of reinforcement bars is higher. Rebar insertion and alignment presents considerable difficulty. As a last resort, use heated bars and then correct their position. What's more, the steel bars are directly sawed off, which brings huge hidden dangers to the safety of the house.

Therefore, the research and development of vertical reinforcement connection technology with reasonable force and convenient construction is of great significance to accelerate the development of prefabricated reinforced concrete structures in China.

Contents of the invention

In order to overcome the defects in the existing technology, a prefabricated reinforced concrete shear wall is now provided. By improving the "distributed connection method" of steel bars to the "centralized connection method" of section steel, it solves the problem of difficult insertion and alignment of steel bars. problems, and further improve the construction connection efficiency.

In order to achieve the above object, the solution of the present invention is to provide a prefabricated reinforced concrete shear wall, including an upper shear wall and a lower shear wall, a socket is embedded in the upper shear wall, and the lower shear wall An exposed profile is embedded in the force wall, and the profile is adapted to penetrate into the socket and grout in the socket so that the upper shear wall and the lower shear wall are connected to each other.

Preferably, there is a joint between the upper shear wall and the lower shear wall, and the joint is filled by the grouting.

Preferably, the grout and the grout used in the grout filling are cement-based materials with high strength, rapid hardening, micro-expansion, and high fluidity. Furthermore, the force transfer between the upper shear wall and the lower shear wall is realized through the steel sleeve grouting connection and the horizontal joint grout filling.

Preferably, the seam is a horizontal seam, and a shear steel plate is added in the middle of the seam.

Preferably, two ends of the socket are respectively provided with grouting holes.

Preferably, both the upper shear wall and the lower shear wall are provided with pre-embedded steel bars, the sockets are overlapped with the pre-embedded steel bars of the upper shear wall, and the profile and the The pre-embedded steel bars of the lower section of the shear wall are lapped.

Preferably, the pre-embedded steel bars include vertical steel bars and horizontal steel bars arranged along the shape of the shear wall, and the sockets and the profiles are respectively overlapped with the vertical steel bars in the respective shear walls.

Preferably, the connection between the socket and the profile is reinforced by stirrups within the overlapping range of the vertical reinforcement. This encryption enhances the effect of the lap connection.

Preferably, the surface of the sleeve and the profile is welded with shearing parts to increase the shearing resistance of the respective components.

Preferably, there are several annular friction ribs on the surface of the socket.

Preferably, the exposed end of the profile is provided with a circular baffle.

Preferably, the socket is a sleeve, and the section bar is section steel.

The beneficial effects of the prefabricated reinforced concrete shear wall of the present invention include:

1) The construction is convenient and efficient. The vertical steel bar connection method proposed by the present invention only needs to insert two section steels into corresponding sleeves respectively, and then grout in the two sleeves, the difficulty of insertion and centering is low, and the grouting efficiency is high. However, the current existing method is to insert multiple steel bars in the lower section of the shear wall into their respective sleeves at one time, and then grout one by one, which is difficult to insert and center, and the grouting efficiency is low;

2) The force is reasonable. Compared with steel sleeve grouting and grout-anchor connection, the present invention has higher stress efficiency of the shear wall under the action of bending moment, but does not affect the oblique shear and direct shear capacity. By replacing the steel bars with section steel and concentrating on both ends of the shear wall, when the bending moment occurs, the section steel under tension is farther away from the neutral axis. Compared with the uniform arrangement of steel bars along the length of the shear wall, the stress is more reasonable. However, the oblique shear and direct shear resistance do not reduce the bearing capacity because the stress mechanism remains unchanged;

3) The effect of the sleeve is fully utilized. The sleeve has two functions, one is the conventional function, that is, the sleeve is used as a part of the grouting connection, and when the steel is pulled, it acts as a strong constraint on the grouting material and the steel inside. The second is that when the grouting connection is under pressure, the sleeve can restrain the internal grouting material and improve its bearing capacity under pressure. In contrast, in the current existing steel grouting connection or steel anchor grout connection, because part of the steel grout connection or steel anchor grout connection is located in the middle of the shear wall section, the second function of the above-mentioned application has not been fully exerted .

Description of drawings

Fig. 1 is the whole decomposed structure schematic diagram of prefabricated reinforced concrete shear wall of the present invention;

Fig. 2 is the schematic diagram of the sectional structure corresponding to the A-A place of the upper shear wall in Fig. 1;

Fig. 3 is the schematic diagram of the cross-sectional structure corresponding to the lower section of the shear wall B-B in Fig. 1;

Fig. 4 is a structural schematic diagram corresponding to the inner wall of the sleeve in Fig. 1 .

Among them: 1—lower shear wall, 2—upper shear wall, 3—vertical reinforcement in lower shear wall, 4—shaped steel, 5—sleeve, 6—vertical reinforcement of upper shear wall, 7—constrained steel Stirrups with the vertical reinforcement in the lower shear wall, 8—stirrups between the restraint sleeve and the vertical reinforcement in the upper shear wall, 9—horizontal reinforcement in the lower shear wall, 10—horizontal reinforcement in the upper shear wall , 11—baffle plate, 12—annular friction rib.

detailed description

The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

As shown in Fig. 1, the present invention firstly provides a kind of prefabricated reinforced concrete shear wall, comprises the upper section shear wall 2 and the lower section shear wall 1, realizes the reliability continuity of the vertical reinforcement of the wall body through the three-section connection, That is, the vertical reinforcement in the lower shear wall is lapped with the section steel, the section steel sleeve is grouted, and the sleeve is overlapped with the vertical reinforcement in the upper section of the shear wall. Wherein, the section steel 4 is pre-embedded in the lower shear wall and located at both ends, and the sleeve 5 is pre-embedded in the upper shear wall and located at both ends. The section steel 4 corresponds to the position of the sleeve 5 .

Specifically, a section steel 4 is pre-embedded at both ends of the lower shear wall 1 . Section steel 4 exposes an anchorage length on the surface of the shear wall, and a baffle 11 is provided at the end to increase the pull-out resistance between section steel 4 and sleeve 5 . A sleeve 5 is pre-embedded at both ends of the upper shear wall 2 respectively. During assembly, the upper shear wall 2 is lowered slowly, and the section steel 4 is inserted into the sleeve 5 . The horizontal joints of the upper and lower shear walls shall be kept at a distance of 20mm. The seams are surrounded by fences. The grouting material is then injected into the sleeve 5 . Part of the grouting material will automatically settle in the lower part of the upper shear wall and fill the horizontal joints to form laitance, which is used to resist horizontal shear after consolidation and hardening.

As shown in Figure 2, the sleeve 5 is overlapped with the vertical reinforcement 6 in the upper shear wall 2, and the stirrup 8 is used to constrain the overlapped range. There are also horizontal steel bars 10 in the upper shear wall 2 .

As shown in FIG. 3 , stirrups 7 are used to constrain the overlapping range between the section steel 4 and the vertical reinforcement 3 in the lower shear wall 1 . There is also a horizontal steel bar 9 in the lower section shear wall 1 .

As shown in Figure 4, there are a number of annular friction ribs 12 on the surface of the sleeve, and the structure of multiple evenly spaced annular friction ribs helps to increase the external concrete and the outer surface of the sleeve 5, as well as the inner grouting material and the sleeve. 5 The bonding effect between the inner surfaces, thereby increasing the reliability of the force.

More preferably, the cross-sectional shape of the section steel 4 can be H-shaped or T-shaped, or other open thin-walled shapes. The section steel 4 can also be a closed thin-walled member, such as a steel pipe. Sleeve 5 is made of industrial seamless steel pipe through surface processing into multi-ribbed. Two small holes are opened on the wall surface of the sleeve 5 near the upper and lower ends to facilitate grouting and grouting. The slurry used for the grouting and the slurry filling is a cement-based material with high strength, rapid hardening, micro-expansion, and high fluidity. Furthermore, the stress transmission between the upper shear wall and the lower shear wall is realized through the steel sleeve grouting connection and the horizontal joint grout filling. Further, all surfaces of the section steel 4 and the steel pipe sleeve 5 are welded with U-shaped shear members to increase the shear resistance of the respective members. When the steel bar 4 is lapped with the steel bar, and the sleeve 5 is lapped with the steel bar, the length adopted meets the requirement of the lapped length of the steel bar. Stirrups are added within the length of the lap joint, and the distance between the stirrups is small (for example, 50mm) to ensure reliable lap acceptance and to enhance the effect of the lap joint.

In practical applications, referring to the table below, the H-section steel in Figure 1 can be replaced with T-section steel (such as the expanded form 1 in the table), or replaced with steel pipes (such as the expanded form 2 in the table). In addition, when the ability of horizontal joints to resist horizontal shear is insufficient, a shear steel plate can be added in the middle of the shear wall section (such as the expansion form 3 in the table). At the same time, when the bending resistance of the shear wall is insufficient, two steel sections and corresponding sleeves can be installed at each end of the shear wall (such as the extended form 4 in the table). Of course, the expanded forms are not limited to forms 1 to 4 in the table.

After completing the above-mentioned implementation process, the following characteristics of the present invention should be reflected:

1) The existing shear wall connection method of inserting the steel bar into the sleeve is improved, so that the insertion and centering difficulty during construction is low, and the grouting efficiency is high;

2) The connection structure between the sleeve and the profile of the present invention makes the force more reasonable and the utilization efficiency higher;

3) The components used in the present invention are commonly used in building construction, and all can obtain materials on the spot.

The above description of the embodiments is for those of ordinary skill in the art to understand and apply the present invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative efforts. Therefore, the present invention is not limited to the above-mentioned embodiments. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (10)

1. A kind of prefabricated reinforced concrete shear wall, it is characterized in that: comprise upper section shear wall and lower section shear wall, described upper section shear wall is embedded with socket piece, and described lower section shear wall is embedded with exposed The external profile, the profile is adapted to penetrate into the socket and grouted in the socket so that the upper shear wall and the lower shear wall are connected to each other. 2. The prefabricated reinforced concrete shear wall according to claim 1, characterized in that: there is a joint between the upper shear wall and the lower shear wall, and the joint is filled by the grouting. 3. The prefabricated reinforced concrete shear wall according to claim 2, characterized in that: the joints are horizontal joints, and a shear steel plate is added in the middle of the joints. 4. The prefabricated reinforced concrete shear wall according to claim 2, characterized in that grouting holes are opened at the end of the socket. 5. The prefabricated reinforced concrete shear wall according to claim 1, characterized in that: the upper shear wall and the lower shear wall are provided with pre-embedded steel bars, and the socket and the upper The pre-embedded steel bars of the shear wall are lapped, and the profile is lapped with the pre-embedded steel bars of the lower shear wall. 6. The prefabricated reinforced concrete shear wall according to claim 5, characterized in that: the pre-embedded steel bars include vertical steel bars and horizontal steel bars arranged along the shape of the shear wall, the socket and the profile They are respectively lapped with the vertical steel bars in the respective shear walls. 7 . The prefabricated reinforced concrete shear wall according to claim 6 , characterized in that, within the ranges where the sockets and the profiles overlap with the vertical steel bars respectively, they are reinforced and connected by stirrups. 7 . 8. The prefabricated reinforced concrete shear wall according to any one of claims 1 to 7, characterized in that: the socket and the surface of the profile are welded with shear parts, the socket is a sleeve, The profile is profile steel. 9. The prefabricated reinforced concrete shear wall according to any one of claims 1 to 7, characterized in that: the inner wall of the socket is provided with several annular friction ribs. 10. The prefabricated reinforced concrete shear wall according to any one of claims 1 to 7, characterized in that: the exposed ends of the profiles are provided with baffles.