CN114086692B - Assembly type shear wall splicing joint connecting structure capable of cooperatively shearing in floor slab plane and construction method thereof - Google Patents

Abstract

The invention discloses an assembled shear wall patchwork connection structure with cooperative shear resistance in the floor plane, which comprises an upper layer assembled shear wall with reserved grooves, an assembled laminated floor with reserved shear resistance connecting steel bars, and a lower layer A prefabricated shear wall and an upper prefabricated shear wall panel-floor shear connector; also discloses a construction method of the joint structure of the prefabricated shear wall with cooperative shear resistance in the plane of the floor slab. Through this connection, the present invention can strengthen the connection stiffness between the upper assembled shear wall and the lower floor, thereby increasing the shear force transmission from the upper assembled shear wall to the lower floor, and reducing the upper-lower assembled shear wall. The impact of shear force improves its seismic performance.

Description

A prefabricated shear wall joint connection structure with coordinated shear resistance in the floor plane and its Construction method

technical field

The invention relates to the technical field of building structures, in particular to an assembled shear wall patchwork connection structure and a construction method thereof for cooperative shear resistance in the plane of a floor slab.

Background technique

Prefabricated shear wall structures are widely used in high-rise buildings in my country. Due to the high seismic requirements in most areas of our country, the prefabricated shear wall structures need to have better seismic performance. The seismic horizontal force of the building structure is mainly generated by the floor slab and the mass of various functional loads it bears, and is transmitted to the shear wall by the floor slab. The shear wall collects the seismic horizontal shear force transmitted by the floor slab and transmits it to the lower floor. The force needs to be transmitted between the upper and lower prefabricated shear walls through the joints, and when the joints bear large horizontal shear force, it will not be conducive to the performance of its seismic performance.

In the current prefabricated shear wall technology, the shear wall joints can be divided into three parts: the lower prefabricated shear wall-floor bottom joint, the upper prefabricated shear wall-floor top joint and the upper -The joint of the prefabricated shear wall on the lower floor, when the joint of the prefabricated shear wall is set at the floor elevation, the horizontal shear force borne by the prefabricated shear wall on the upper floor will pass through the joint of the upper prefabricated shear wall-floor top The joints and the joints of the upper-lower prefabricated shear wall are transmitted to the floor and the lower prefabricated shear wall respectively, and the shear force shared by the floor is redistributed through the internal force in the plane, and after superimposing the horizontal shear force generated by the mass borne by itself, Through the joint of the lower prefabricated shear wall-floor slab and then passed to the lower prefabricated shear wall, it can be seen that in the prefabricated shear wall, the floor can slow down the shearing of the joint between the upper and lower prefabricated shear walls concentrated. However, in the current prefabricated shear wall technology, the upper-lower prefabricated shear wall joints are improved and strengthened as the key shear joints, and the joints between the floor and the upper and lower prefabricated shear walls are improved and strengthened. Connection-enhancing technologies are yet to emerge.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the background technology, the first purpose of the present invention is to disclose an assembled shear wall joint connection structure for cooperative shear resistance in the plane of the floor; the second purpose is to disclose the cooperative shear resistance in the plane of the floor The construction method of the prefabricated shear wall patchwork connection structure. Through this connection, the connection stiffness between the upper prefabricated shear wall and the lower floor can be strengthened, thereby increasing the shear force transfer from the upper prefabricated shear wall to the lower floor, and reducing the shear force between the upper and lower prefabricated shear walls influence and improve its seismic performance.

Technical solution: The prefabricated shear wall patchwork connection structure for synergistic shear resistance in the floor plane disclosed by the present invention includes the upper prefabricated shear wall with grooves reserved, and the prefabricated laminated floor with reserved shear connection steel bars , Lower prefabricated shear wall and upper prefabricated shear wall panel-floor shear connector;

The groove is set at the bottom of the upper prefabricated shear wall where the non-edge constraining member is, and corresponding reinforcing steel bars are reserved, and the prefabricated laminated floor slab with the reserved shear connecting reinforcement is in contact with the upper prefabricated shear wall groove. The reinforced steel bar at the bottom corresponding to the area is bent and extended into the groove, and the prefabricated shear wall of the lower layer is not provided with a reserved steel bar in the area corresponding to the groove, and the prefabricated shear wall panel-floor shear wall of the upper layer is The cut connectors include longitudinal closed steel bars formed by the reserved connecting steel bars of the floor, I-shaped steel placed in the longitudinal closed steel bars, horizontal restraint stirrups and high-strength grouted anchor grouting materials.

Further, the groove is set at the position of the non-edge constraining member in the middle of the upper prefabricated shear wall, and its cross section is rectangular.

Further, a slope of 2% is set at the middle point of the upper edge of the groove.

Further, the prefabricated part of the prefabricated laminated floor slab with reserved shear connecting reinforcement continues to extend and bend the longitudinally stressed steel bar at the groove position of the upper prefabricated shear wall to form the upper prefabricated shear wall slab-floor shear Cut the floor slabs in the connectors to reserve connecting steel bars and extend them into the grooves.

Further, the top of the lower prefabricated shear wall only reserves longitudinal grout anchor connecting reinforcement at the position of the edge restraint member.

The construction method of the joint structure of the prefabricated shear wall with cooperative shear resistance in the plane of the floor slab includes the following steps:

S1. Prefabricate the upper prefabricated shear wall, and reserve grooves, prefabricate the prefabricated laminated floor slab with reserved shear connecting reinforcement inside and outside, and prefabricate the lower prefabricated shear wall;

S2. Complete the hoisting construction of the prefabricated shear wall of the lower floor and the prefabricated laminated floor slab with reserved shear connecting reinforcement. Bind horizontal restraint stirrups on the reserved steel bars;

S3. Complete the post-pouring construction of the prefabricated laminated floor slab, and carry out the hoisting and assembly of the upper prefabricated shear wall. A 20mm thick joint grouting circulation gap is reserved between the upper prefabricated shear wall and the top surface of the floor to form a grouting anchor layer;

S4. Set up side blocking templates around the groove and the grouting layer of the grouting anchor to keep the alveolar space, the grouting hole space of the grouting anchor and the joint grouting circulation gap connected to each other;

S5. Carry out the grouting construction of the grouting anchor. After confirming that all the grouting anchor connectors and reinforcement alveoli are full of grouting, the grouting is completed. After maintenance, the formwork is removed to complete the synchronous grouting construction of the upper prefabricated shear wall panel-floor shear connector .

Beneficial effect: compared with prior art, the advantages of the present invention are:

1. In the present invention, an upper-layer assembled shear wall plate-floor shear connector that transmits shear force to the assembled floor slab is arranged in the middle of the joint of the assembled shear wall, which can reduce the horizontal shear force borne by the upper-layer assembled shear wall. The larger shear force is transmitted to the plane of the prefabricated floor. After redistribution of the internal force of the floor and superimposition of the horizontal shear force generated by the mass of the floor, it is transmitted to the prefabricated shear wall of the lower floor through the seam of the bottom of the floor. The force wall can effectively reduce the large horizontal shear force distribution between the upper and lower prefabricated shear wall joints, optimize the mechanical properties of the prefabricated shear wall joints and improve the seismic performance of the prefabricated shear wall;

2. The present invention transmits the relatively large horizontal shear force borne by the upper assembled shear wall to the plane of the assembled floor through the upper assembled shear wall panel-floor shear connector. The rigidity is high, and other prefabricated shear walls connected to the floor can generate internal force redistribution through the in-plane rigidity, thereby optimizing the horizontal shear force distribution of the prefabricated shear wall and realizing multi-piece prefabricated shear forces on the same floor The wall cooperates to bear the force;

3. For the upper prefabricated shear wall panels with reserved grooves according to the present invention, since the reserved grooves extend into the prefabricated shear wall body, the height of the acting surface where the shear wall transmits shear force to the floor is higher than The prefabricated shear wall joint can reduce the joint shear force of the prefabricated shear wall in advance, thereby avoiding excessive shear force at the joint part of the prefabricated shear wall, and further improving the mechanical properties of the prefabricated shear wall;

4. The upper prefabricated shear wall panel-floor shear connector proposed by the present invention is composed of high-strength grouting materials, reinforced steel bars reserved for the prefabricated floor and pre-embedded I-shaped steel. Its shear rigidity is large and can effectively improve the The horizontal shear force borne by the prefabricated shear wall is transmitted to the plane of the prefabricated floor.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of the whole split of the present invention;

Fig. 2 is a three-dimensional schematic diagram of the present invention after overall assembly;

Fig. 3 is the bottom schematic diagram of the upper layer assembled shear wall of groove of the present invention;

Fig. 4 is the schematic diagram of the prefabricated laminated floor slab of the present invention with reserved shear connection reinforcement;

Fig. 5 is a sectional view of 1-1 in Fig. 4 of the present invention;

Fig. 6 is the schematic diagram of the top of the prefabricated shear wall of the lower floor of the present invention;

Fig. 7 is a three-dimensional schematic diagram of steel bars and shaped steel in the upper layer assembled shear wall panel-floor shear connector of the present invention;

Fig. 8 is a schematic view of the structure of the upper assembled shear wall panel-floor shear connector of the present invention;

Fig. 9 is a sectional view of 2-2 in Fig. 8 of the present invention.

detailed description

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1-9, the prefabricated shear wall joint connection structure with coordinated shear resistance in the floor plane includes the upper prefabricated shear wall 1 with reserved groove 2, and the prefabricated stack with reserved shear connection reinforcement. Composite floor 6/7, lower prefabricated shear wall 8 and upper prefabricated shear wall-floor shear connector 17.

The groove 2 is set at the position of the non-edge constraining member in the middle of the upper prefabricated shear wall 1, and its cross section is rectangular.

A slope of 2% is set at the midpoint of the upper edge of the groove 2 .

The groove 2 is set at the bottom of the upper prefabricated shear wall 1 and the corresponding reinforcing steel bar is reserved. The bottom reinforced steel bars corresponding to the groove area of the shear wall 1 are bent and extended into the groove 2, and the lower prefabricated shear wall 8 is not provided with reserved steel bars in the area corresponding to the groove 2, and the upper layer The prefabricated shear wall panel-floor shear connector 17 includes a longitudinal closed reinforcement 9 formed by the reserved connecting reinforcement 13/14 of the floor, an I-shaped steel 4 placed in the longitudinal closed reinforcement 9, a horizontal restraint stirrup 16 and High-strength anchor grouting material 3.

The prefabricated part of the prefabricated laminated floor 6/7 with the reserved shear connecting reinforcement is extended and bent to form the upper prefabricated shear wall panel at the position of groove 2 of the upper prefabricated shear wall. The floor in the floor shear connector 17 reserves the connecting steel bar 13/14, and stretches in the groove 2.

The top of the lower prefabricated shear wall 8 only reserves the longitudinal grout anchor connecting steel bar 15 at the position of the edge constraining member, and no steel bar is reserved at other positions.

To assist understanding, reference numeral 10 is the seam between the post-cast concrete part of the prefabricated laminated floor slab and the top surface of the lower prefabricated shear wall; reference numeral 11 is the area of the upper prefabricated shear wall panel-floor shear connector ; Reference numeral 12 is the area of the non-prefabricated shear wall panel-floor shear connector.

The construction method of the joint structure of the prefabricated shear wall with cooperative shear resistance in the plane of the floor slab includes the following steps:

S1. Prefabricate the upper prefabricated shear wall 1, and reserve the groove 2, prefabricate the prefabricated laminated floor 6/7 with reserved shear connecting reinforcement inside and outside, prefabricate the lower prefabricated shear wall 8 ;

S2. Complete the hoisting construction of the prefabricated shear wall 8 of the lower floor and the prefabricated laminated floor 6/7 of the reserved shear connecting steel bar. Type-shaped steel 4, and tie horizontal restraint stirrups 16 on the reserved steel bars;

S3. Complete the post-pouring construction of the prefabricated laminated floor slab, carry out hoisting and assembly of the upper prefabricated shear wall 1, and reserve a 20mm thick seam grouting circulation gap between the upper prefabricated shear wall 1 and the top surface of the floor to form grout Anchor grouting layer;

S4. Set side blocking templates around the groove 2 and the grouting layer of the grouting anchor to keep the alveolar space, the grouting hole space of the grouting anchor and the joint grouting circulation gap connected to each other;

S5. Carry out the grouting construction of the grouting anchor. After confirming that all the grouting anchor connectors and reinforcement alveoli have been grouted, the grouting is completed. After the maintenance, the formwork is removed to complete the synchronous grouting of the upper prefabricated shear wall panel-floor shear connector 17 construction.

Claims (6)

1. The utility model provides an assembly type shear force wall piece connection structure that shears in coordination in floor plane which characterized in that: the shear wall comprises an upper-layer assembly type shear wall (1) with a reserved groove (2), an assembly type composite floor slab (6/7) with reserved shear connection steel bars, a lower-layer assembly type shear wall (8) and an upper-layer assembly type shear wall slab-floor slab shear connecting piece (17);

the groove (2) is arranged at the bottom non-edge constraint component part of the upper-layer assembly type shear wall (1) and is reserved with corresponding reinforcing steel bars, the assembly type composite floor slab (6/7) reserved with the shear-resistant connecting steel bars bends at the bottom stress steel bars corresponding to the groove area of the upper-layer assembly type shear wall (1) and extends into the groove (2), the lower-layer assembly type shear wall (8) is not provided with the reserved steel bars in the area corresponding to the groove (2), and the upper-layer assembly type shear wall slab-floor slab shear connecting piece (17) comprises longitudinal closed steel bars (9) formed by the floor slab reserved connecting steel bars (13/14), I-shaped steel (4) arranged in the longitudinal closed steel bars (9), horizontal constraint hoop bars (16) and high-strength grout grouting material (3).

2. The fabricated shear wall splicing joint connection structure resisting shear in cooperation in the floor plane as recited in claim 1, wherein: the groove (2) is formed in the position of a non-edge restraining component in the middle of the upper-layer assembled shear wall (1), and the cross section of the groove is rectangular.

3. The fabricated shear wall splicing joint connection structure resisting shear in cooperation in the floor plane as recited in claim 2, wherein: the middle point of the upper edge of the groove (2) is provided with a 2% slope.

4. The fabricated shear wall splicing joint connection structure resisting shear in cooperation in the floor plane as recited in claim 1, wherein: and the prefabricated part of the assembly type composite floor slab (6/7) with the reserved shear-resistant connecting steel bars is continuously extended and bent at the position of the groove (2) of the upper assembly type shear wall (1) to form floor slab reserved connecting steel bars (13/14) in the upper assembly type shear wall slab-floor slab shear connector (17) and extend into the groove (2).

5. The fabricated shear wall splicing joint connection structure resisting shear in cooperation in the floor plane as recited in claim 1, wherein: and longitudinal grout anchor connecting steel bars (15) are reserved only at the positions of the edge restraining members at the top of the lower assembled shear wall (8).

6. The construction method of the assembly type shear wall splicing joint connection structure with cooperative shearing in the floor slab plane as recited in claim 1, wherein: the method comprises the following steps:

s1, prefabricating the upper-layer assembled shear wall (1), reserving a groove (2), prefabricating assembled composite floor slabs (6/7) with reserved shear-resistant connecting steel bars on the inner side and the outer side, and prefabricating the lower-layer assembled shear wall (8);

s2, completing the hoisting construction of a lower-layer assembled shear wall (8) and an assembled composite floor slab (6/7) with reserved shear-resistant connecting steel bars, placing I-shaped steel (4) in the middle of longitudinal closed steel bars (9) before a post-cast layer (5) of the post-cast composite floor slab, and binding horizontal restraining stirrups (16) on the reserved steel bars;

s3, finishing post-pouring construction of the assembled composite floor slab, hoisting and assembling the upper assembled shear wall (1), and reserving a seam grouting circulation gap with the thickness of 20mm between the upper assembled shear wall (1) and the top surface of the floor slab to form a grouting anchor grouting layer;

s4, arranging side blocking templates around the groove (2) and the grout anchor grouting layer, and keeping the tooth space, the grout anchor grouting hole space and the abutted seam grouting circulation gap communicated with each other;

and S5, performing slurry anchor grouting construction, finishing grouting after all slurry anchor connecting pieces and reinforcing tooth grooves are fully grouted, and removing the formwork after maintenance to finish synchronous grouting construction of the upper-layer assembled shear wallboard-floor slab shear connecting piece (17).

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