CN110593437B - Construction method of prefabricated shear wall - Google Patents

Abstract

A construction method for prefabricated shear walls relates to the technical field of building construction technology and includes the following steps: 1. Prefabricated prestressed bottom plates, upper shear walls and lower shear walls; in the lower shear walls and the upper shear walls Pre-embedded matching shear key and shear groove, the shear key includes two side plates extending outward from the wall, and the shear groove includes a positioning groove whose depth is less than the length of the side plate extending outward from the wall; 2. On-site assembly; hoist the prefabricated prestressed base plate to the beam and let one end of it rest on the top of the lower shear wall, hoist the upper shear wall so that the shear key falls into the positioning groove, adjust the spacing adjustment parts, and place the two sides. The width of the plate spacing is widened, so that the side plates are tightly against the side walls of the positioning groove, and the prefabricated prestressed bottom plate is reinforced and concrete is poured to form a superimposed floor plate, and part of the concrete is poured into and filled with the upper shear wall and the lower wall. In the gap between the shear walls, the upper shear wall, the lower shear wall and the superimposed floor slab are connected into one by using the cast-in-place concrete.

Description

Construction method of prefabricated shear wall

technical field

The invention relates to the technical field of building construction technology, in particular to a construction method of an assembled shear wall.

Background technique

Since the main building components have been produced in batches in the factory in advance, compared with the traditional construction process, the prefabricated construction process has the advantages of energy saving and short construction period.

Chinese patent document "CN103883034A" discloses a prefabricated shear wall and wall beam connection structure with edge restraining members. The four corners of the wall body are rectangular missing corners, and rectangular steel pipes are respectively provided on the rectangular missing corners. The middle through hole of the wall body is longitudinally arranged, and there is a hidden column between the upper and lower rectangular steel pipes on both sides of the wall body; each hidden column is connected to the upper and lower hollow rectangular steel pipes on the corresponding side; A feed inlet is reserved at the bottom of the column; a reinforced hole is reserved on the beam and a grouting sleeve is set. During on-site assembly and construction, it is necessary to insert the steel bar extending from the bottom end of the upper shear wall into the grouting sleeve through the reinforced hole. The reinforcing bars protruding from the top of the lower shear wall also need to be inserted into the grouting sleeve through the insertion holes, and then pressure grouting into the grouting sleeve to connect the upper shear wall and the lower shear wall; Pour concrete, let the concrete first enter the rectangular steel pipe at the lower part of the upper shear wall through the feeding port, then pass through the post-cast concrete pouring hole on the beam, and enter the rectangular steel pipe at the upper part of the lower shear wall, so as to penetrate the entire upper shear wall. The reserved hole portion of the wall-beam-lower shear wall structure. Since it is necessary to align the protruding steel bars with the insertion holes one by one during the actual construction, the alignment takes a long time. In addition, in the process of wall transportation and hoisting, once a bump occurs, the protruding steel bars are skewed, which will lead to the protruding steel bars in the It cannot be inserted into the grouting hole during assembly. Finally, after the steel bar is inserted into the grouting sleeve through the reinforced hole, it is necessary to press grouting into each grouting sleeve one by one. There are many process nodes to be controlled during the construction process, and the operation is troublesome. .

Chinese patent document "CN109736479A" discloses a prefabricated shear wall splicing structure and its vertical connection method. It is provided with two sets of upper positioning teeth on the upper wall plate, and a set of lower positioning teeth on the lower wall plate. The positioning teeth and the lower positioning teeth are arranged in a staggered manner along the seam direction. A groove space is formed between the two sets of upper positioning teeth that can just accommodate the embedding of the lower positioning teeth. When the upper wall panel and the lower wall panel are assembled, the lower positioning teeth By fitting into the grooves between the upper positioning teeth, the alignment between the upper wall panel and the lower wall panel can be realized, and at the same time, the upper vertical hoop steel bars set on the upper wall panel and the lower wall panels set on the lower wall panel can be aligned. The vertical hoop steel bars are also staggered and overlapped in the joint space, and then the full-length steel bars are horizontally passed through the reserved holes on the upper positioning teeth and the lower positioning teeth in the direction of the seam, and are respectively aligned with the upper vertical bars on both sides. The hoop reinforcement and the lower vertical hoop reinforcement are fixed and bundled to form a joint reinforcement cage structure. Finally, the formwork is poured into the reinforcement cage structure with cast-in-place concrete to connect the upper wall panel and the lower wall panel into a whole. Since the upper wall panel and the lower wall panel are only connected by the through-length steel bars, and in order to ensure that the through-length steel bars can pass through smoothly, the diameter of the reserved holes on the upper and lower positioning teeth must be larger than that of the through-length steel bars. When concrete is connected in series, the upper wall panel and the lower wall panel are actually in a state of incomplete connection (which can be understood as a semi-connected state). In fact, additional supporting devices (such as hydraulic support bars) are needed to support the upper wall To prevent the wall panel from being skewed, it also has the defects of complicated construction process and inconvenient operation.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a simple and easy-to-operate assembly shear wall construction method.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: a construction method for an assembled shear wall, comprising the following steps:

1. Prefabricated prestressed bottom plate, upper shear wall and lower shear wall;

When prefabricating the upper shear wall and the lower shear wall, the protruding steel bars are left at the top of the lower shear wall and the bottom end of the upper shear wall, and the top and upper shear walls of the lower shear wall are cut. The bottom end of the force wall is pre-embedded with shear components that can cooperate with each other, the shear components include shear keys and shear grooves, and the shear keys include a base plate embedded in the wall and two spaced apart from the wall. A side plate protruding from the body, the proximal end of the side plate is fixedly connected to the front surface of the base plate, the two side plates are opened at the distal end to form an open end, and a spacing adjustment part is arranged between the two side plates, the said The shear groove includes a positioning groove capable of accommodating the side plate of the shear key, the depth of the positioning groove is less than the length of the side plate protruding from the wall, and the size of the notch of the positioning groove is larger than the size of the open end of the shear key .

2. On-site assembly;

2.1 Hoisting the prefabricated prestressed bottom plate: horizontally hoist the prefabricated prestressed bottom plate to the beam and make one end rest on the top of the fixed lower shear wall. The lap joint is controlled outside the notch of the positioning groove, so as to prevent the prefabricated prestressed bottom plate from covering the positioning groove and affecting the subsequent insertion of the shear key into the positioning groove.

2.2 Hoisting the upper shear wall: hoist the upper shear wall upright above the fixed lower shear wall, adjust the position of the upper shear wall so that the shear key is aligned with the positioning groove, Keep the lifting force of the sling on the upper shear wall. After the shear key completely falls into the positioning groove, the protruding steel bars at the top of the lower shear wall and the bottom end of the upper shear wall will stick out. The steel bars are overlapped, and then the spacing adjustment member is adjusted to widen the spacing width between the two side plates of the shear key, so that the side plates are tightly abutted against the side walls of the positioning groove, and then the sling is removed. For the lifting force of the upper shear wall, the upper shear wall is fixed above the lower shear wall by relying on the binding force of the anti-shear groove against the shear key. The ends on the shear wall are located in the gap between the bottom end of the upper shear wall and the top end of the lower shear wall and outside the side plates of the shear keys.

2.3 Laminate floor slab reinforcement and pouring concrete: The prefabricated prestressed base plate is reinforced and concrete is poured, the prefabricated prestressed base plate and the concrete superimposed layer above it form a laminated floor slab, and part of the concrete is poured during the pouring process. Enter and fill the gap between the bottom end of the upper shear wall and the top of the lower shear wall, the gap between the shear key and the shear groove, and the gap between the two side plates of the shear key. The concrete connects the upper shear wall, the lower shear wall and the superimposed floor slab into one body.

Specifically, the spacing adjustment component provided on the shear key includes two horizontally opposite screws and a joint nut, the roots of the screws are fixedly connected to the inner side walls of the side plates, and the threads on the two screws rotate in the direction of rotation. On the contrary, the threads at both ends of the joint nut are rotated in opposite directions and each is connected with a screw through a thread.

In step 2.2, use a wrench to turn the joint nut so that the screw extends the width of the gap between the two side plates of the shear key.

As a preferred embodiment, when the lower shear wall and the upper shear wall are prefabricated in step 1, the top end of the lower shear wall is cut off by moulding to form a shoulder, and the The YBZ main reinforcement bars of the lower shear wall are protruded from the shoulders, and the YBZ main reinforcement bars of the upper shear wall are protruded from the bottom ends of which are opposite to the shoulders of the lower shear wall.

In step 2.2, after the upper shear wall is fixed above the lower shear wall, the upper shear wall and the lower shear wall YBZ main reinforcement bars are lapped above the shoulders.

In step 2.3, pour a part of the concrete above the shoulder, fill the top missing corner of the lower shear wall with concrete and wrap the lapped YBZ main reinforcement.

Further, a concrete pouring through hole is provided on the part of the side plate that protrudes from the wall, and the highest point of the concrete pouring through hole in the vertical direction is higher than the upper surface of the prefabricated prestressed bottom plate, and the screw The connection point to the side plate is below the concrete pour through hole.

In step 2.3, when adding reinforcement on the prefabricated prestressed base plate, part of the reinforcement is passed through the concrete pouring through hole; when pouring concrete, the concrete pouring through hole is filled with concrete.

Wherein, when the YBZ main reinforcement bars of the upper shear wall and the lower shear wall are overlapped, the overlapping length S≧35d is controlled, where d is the diameter of the YBZ main reinforcement bars.

More preferably, when the lower shear wall and the upper shear wall are prefabricated in step 1, the shear keys are completely inserted into the positioning grooves and the spacing adjustment parts are adjusted to make the side plates of the shear keys tight before moulding. Abut against the side wall of the positioning groove, so that the shear key and the shear groove are fixedly connected together, and then the connected shear key and the shear groove are placed on the upper shear wall and the lower shear for casting. In the mold of the force wall; after releasing the mold, make a pairing mark on the upper shear wall and the lower shear wall obtained by forming, and finally adjust the spacing adjustment part to narrow the distance between the two side plates. The shear wall and the lower shear wall are separated and transported.

When hoisting the upper shear wall in step 2.2, select the upper shear wall that is paired with the current lower shear wall.

Since the present invention pre-embeds the new structural shear components in the prefabrication of the upper shear wall and the lower shear wall, the above shear components are better than those in the prior art in terms of alignment and insertion and fixation by aligning the holes with steel bars and sleeves. The way of fixing the cylinder is simpler and faster in operation. In addition, in the construction method of the present invention, after the hoisting of the upper shear wall and the alignment and fixation of the shear components are completed, it is no longer necessary to provide other auxiliary support devices to support the upper shear wall to prevent displacement and inclination. It can also improve the convenience and work efficiency of construction. Finally, the prefabricated shear wall obtained by the construction method of the present invention is better in stability than the prefabricated shear wall produced by the prior art, because the After the concrete poured at the construction site is solidified, the upper shear wall, the lower shear wall and the superimposed floor slab will be connected by concrete into one body, and the superimposed floor will be connected to the upper shear wall and the lower shear force. The wall connection nodes form horizontal constraints, which can improve the connection stability of the upper shear wall and the lower shear wall.

Description of drawings

Fig. 1 is the front elevational view of the straight-limb prefabricated shear wall standard part used in the embodiment;

Figure 2 is a schematic diagram of the reinforcement of the standard parts of the straight-leg prefabricated shear wall;

Figure 3 is a schematic diagram of the connection structure after the assembly of two straight-limb prefabricated shear walls;

Figure 4 is a schematic diagram of a splicing node after the assembly of two straight-limb prefabricated shear walls;

Fig. 5 is the top view of the straight-limb prefabricated shear wall standard part shown in Fig. 1;

Figure 6 is a side elevational view of the standard part of the straight-limb prefabricated shear wall shown in Figure 1;

Figure 7 is a schematic diagram of the connection structure between two straight-leg prefabricated shear walls and between them and the floor;

8 is a schematic diagram of the front structure of the shear key;

Fig. 9 is the side structure schematic diagram of shear key;

In the picture:

1——Prefabricated prestressed bottom plate 2——Upper shear wall 3——Lower shear wall 4——Extruded steel bar

6 - Spacing adjustment part 7 - Concrete 8 - YBZ main reinforcement bar 3a - Shoulder

5a——Shear key 5b——Shear groove 6a——Screw 6b——Coupling nut

5a1——Base plate 5a2——Side plate 5a2a——Concrete pouring through hole.

Detailed ways

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", "above", "below" and the like indicate orientations Or the positional relationship is based on the orientation or positional relationship shown in the drawings, such expressions are only for the purpose of making the description of the present invention simpler and more convenient, rather than indicating or implying that the components referred to must have a specific orientation or be constructed in a specific orientation. and operation.

In addition, in the present invention, unless otherwise expressly specified and limited, the terms "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or It is integrally connected; it can be directly connected or indirectly connected through an intermediate medium. “Overlap” should be understood as the two overlapping each other, and it does not limit that the two overlapping parts must be fixedly connected together.

Compared with the existing construction technology, the main difference of the present invention is: 1. When prefabricating the upper shear wall body 2 and the lower shear wall body 3, the shear resistance components are embedded in them, and the shear resistance components adopt the shear resistance key 5a The connection mode matched with the shear groove 5b makes the splicing operation of the upper shear wall 2 and the lower shear wall 3 easier; It tightly abuts against the side wall of the anti-shear groove 5b, and realizes the "self-stabilization" of the upper shear wall 2 after splicing, so that there is no need to add an auxiliary support device to keep the upper shear wall 2 from being skewed or overturned, Make construction easier. 2. The lamination process is adopted. After the upper shear wall 2 and the lower shear wall 3 are spliced by the shear components, a gap is left. One end of the prefabricated prestressed bottom plate 1 extends into the gap and overlaps the lower shear force. At the top of the wall 3, all the components are connected into one through the cast-in-place concrete 7, and the superimposed floor slab forms a horizontal constraint at the connection node of the upper shear wall 2 and the lower shear wall 3, which better guarantees the upper shear wall. The stability of the connection between the force wall 2 and the lower shear wall 3.

In order to facilitate those skilled in the art to more clearly understand the improvements of the present invention relative to the prior art, the present invention will be further described below with reference to the accompanying drawings.

In general, the construction method of the prefabricated shear wall involved in the present invention mainly includes two parts, the first part is the prefabricated prestressed bottom plate 1, the upper shear wall body 2 and the lower shear wall body 3 (the upper shear wall body 2 and the lower shear wall 3 adopt the straight-leg prefabricated shear wall standard parts of the structure shown in Figure 1-2 and Figure 5-6), this part is completed in the factory, the second part is assembled on site, on the construction site Finish. Next, the factory production part and the field assembly part are introduced separately.

As far as the factory production is concerned, since the present invention does not improve the method for prefabricating the prestressed base plate 1 in the factory, reference may be made to the existing literature for how to prefabricate the prestressed base plate 1, and will not be described in detail here. The improvement of the factory part is mainly for the prefabricated upper shear wall 2 and lower shear wall 3 (the overall structure of the upper shear wall 2 and the lower shear wall 3 is shown in Figure 1-2 and Figure 5-6). The structure of the standard parts of the straight-leg prefabricated shear wall), specifically, when prefabricating the upper shear wall 2 and the lower shear wall 3, the top of the lower shear wall 3 and the bottom end of the upper shear wall 2 Indwell the protruding steel bar 4 (for the case that it needs to be spliced with multiple walls, you can leave the protruding steel bar 4 at the top and bottom ends of the wall as shown in Figure 1-2 and Figure 5-6), and under the shear force The top end of the wall 3 and the bottom end of the upper shear wall 2 are pre-embedded with shear components that can cooperate with each other (for the case of needing to be spliced with multiple walls, it can be installed on the wall as shown in Figure 1-2 and Figure 5-6 Both the top and bottom ends of the device are pre-embedded with anti-shear components, for example, the top end is a anti-shear groove 5b, and the bottom end is a anti-shear key 5a). 7 and 9, the shear key 5a includes a base plate 5a1 embedded in the wall and two side plates 5a2 that are arranged at intervals and protrude from the wall, and the proximal end (the top end in the figure) of the side plate 5a2 is fixed. Connected to the front surface of the base plate 5a1 (that is, the lower surface of the base plate 5a1 in the figure), the two side plates 5a2 are opened at the distal end to form an open end, and a spacing adjustment part is arranged between the two side plates, in order to be compatible with the shear key 5a. Matching, the shear groove 5b is designed with a positioning groove that can accommodate the side plate 5a2 of the shear key 5a. The maximum depth at which the plate 5a2 can be inserted into the positioning slot) is less than the length of the side plate 5a2 protruding from the wall. In order to facilitate the insertion of the shear key 5a, the slot size of the positioning slot is designed to be larger than the size of the open end of the shear key 5a. In actual operation, in order to reduce the adverse effect of manufacturing errors on the assembly of the upper shear wall 2 and the lower shear wall 3, the following methods can be used: 2. The factory prefabricates the upper shear wall 2 and the lower shear wall 3 Before installing the mold, insert the shear key 5a into the positioning groove completely and adjust the spacing adjustment member 6 to make the side plate 5a2 of the shear key 5a tightly abut against the side wall of the positioning groove, so that the shear key 5a and the shear key The grooves 5b are fixedly connected together, and then the connected shear key 5a and the shear groove 5b are placed in the mold for casting the upper shear wall 2 and the lower shear wall 3; after the mold is released, Make matching marks on the formed upper shear wall 2 and lower shear wall 3, and finally adjust the spacing adjustment member 6 to narrow the distance between the two side plates 5a2, then the upper shear wall 2 Separated from the lower shear wall 3 for easy transportation. 3. When hoisting the upper shear wall 2 on the construction site for assembly, select the upper shear wall 2 that is paired with the current lower shear wall 3.

The work of the on-site assembly part of the construction site mainly includes: 2. After fixing the lower shear wall 3, firstly hoist the prefabricated prestressed base plate 1 to the beam horizontally and make one end rest on the fixed lower shear wall 3 During the construction process, it should be noted that the overlap between the prefabricated prestressed base plate 1 and the lower shear wall 3 should be controlled outside the notch of the positioning groove, and it must be avoided that the prefabricated prestressed base plate 1 blocks the positioning groove and affects the subsequent The case where the shear key 5a is inserted. 3. After the prefabricated prestressed base plate 1 is hoisted, the upper shear wall 2 is hoisted upright above the fixed lower shear wall 3, and the upper shear wall 2 is supported by the construction workers, and the upper shear force is gradually adjusted. The position of the wall body 2 is such that the shear key 5a is aligned with the positioning groove, and the lifting force of the sling against the upper shear wall body 2 is maintained. The protruding steel bar 4 will overlap with the protruding steel bar 4 at the bottom end of the upper shear wall 2, and then adjust the spacing adjustment member 6 to expand the spacing width between the two side plates 5a2 of the shear key 5a, so that the side plates After 5a2 is firmly against the side wall of the positioning groove, the lifting force of the sling on the upper shear wall 2 can be removed. At this time, the upper shear wall 2 relies on the restraint force of the shear groove 5b against the shear key 5a. It is fixed above the lower shear wall 3. After the upper shear wall 2 is hoisted, the end of the prefabricated prestressed bottom plate 1 that is placed on the lower shear wall 3 is located between the bottom end of the upper shear wall 2 and the lower shear wall. 3 in the space between the top ends and on the outside of the side plate 5a2 of the shear key 5a. 4. After completing the hoisting of the upper shear wall 2, you can tie steel bars on the prefabricated prestressed base plate 1 and pour concrete 7. During the pouring process, part of the concrete 7 is poured into and filled with the bottom end of the upper shear wall 2. The gap with the top of the lower shear wall 3, the gap between the shear key 5a and the shear groove 5b, and the gap between the two side plates 5a2 of the shear key 5a, the prefabricated prestressed bottom plate 1 and the concrete above it The superimposed layer finally constitutes a superimposed floor slab, and the use of these cast-in-place concrete realizes the connection of the upper shear wall 2, the lower shear wall 3 and the superimposed floor slab into one body. So far, the upper shear wall body 2 is completed. Assembly and fixation with the lower shear wall 3, the assembled combined wall structure is shown in Figure 3-4 and Figure 7-8)

It should be noted that the structure of the spacing adjusting member 6 is not specifically limited in the above-mentioned embodiments, and those skilled in the art should understand that the width of the spacing between the two side plates 5a2 of the shear key 5a can be widened. There are many ways. For example, a wedge-shaped plug can be tapped between the two side plates 5a2, and the side plate 5a2 can be pressed to the outside through the plug to expand outward and tightly abut against the side wall of the positioning groove. There are other suitable structures in the prior art, which are not listed here. Preferably, the structure shown in FIG. 9 can be adopted. Specifically, in FIG. 9 , the distance adjusting member 6 includes two screws 6a arranged horizontally opposite to each other and a joint nut 6b. The root of the screw 6a and the side plate 5a2 The inner side walls are fixedly connected, the threads on the two screws 6a have opposite directions of rotation, and the threads at both ends of the joint nut 6b have opposite directions of rotation, and each is connected with a screw 6a through threads. When it is necessary to adjust the distance between the two side plates 5a2, turn the joint nut 6b with a wrench to allow the screw 6a to expand or reduce the distance between the two side plates 5a2 (the spanner can be inserted from the gap between the two side plates 5a2) , the operation is simple, safe and reliable.

In addition, when prefabricating the lower shear wall body 3 and the upper shear wall body 2, the top end of the lower shear wall body 3 can be cut off by mold forming, so as to form the shoulder 3a as shown in FIG. The YBZ main reinforcement bar 8 of the shear wall body 3 protrudes from the shoulder 3a, and the YBZ main reinforcement bar 8 of the upper shear wall body 2 extends from its bottom end opposite the shoulder 3a of the lower shear wall body 3. In this way, when the upper shear wall body 2 is fixed above the lower shear wall body 3, the YBZ main reinforcement bars 8 of the upper shear wall body 2 and the lower shear wall body 3 can be placed on the shoulders as shown in Figure 3. The lap joint above the part 3a (the lap length S is preferably ≧ 35d, where d is the diameter of the YBZ main reinforcement bar 8), when the concrete 7 is cast in place, a part of the concrete 7 is poured over the shoulder 3a, and the concrete 7 is used Fill up the top missing corner of the lower shear wall 3 and wrap the overlapped YBZ main reinforcement bars 8, thereby further improving the connection stability of the upper shear wall 2 and the lower shear wall 3.

Further, when making the shear key 5a, a concrete pouring through hole 5a2a can also be opened on the part of the side plate 5a2 that protrudes from the wall. It should be noted that when the upper shear wall 2 and the lower shear After the force wall 3 is docked, the highest point of the concrete pouring through hole 5a2a in the vertical direction should be higher than the upper surface of the prefabricated prestressed bottom plate 1, and at the same time, the connection point of the screw 6a and the side plate 5a2 is preferably located in the concrete pouring through hole. 5a2a below. In this way, when adding reinforcement on the prefabricated prestressed base plate 1, a part of the reinforcement can be passed through the concrete pouring through hole 5a2a, and when pouring the concrete 7, let the concrete 7 fill the concrete pouring through hole 5a2a, the benefits of this operation It can strengthen the restraint of the shear key 5a in the vertical direction, so that the connection strength between the shear key 5a and the floor slab is higher.

The above-mentioned embodiment is a preferred implementation scheme of the present invention. In addition, the present invention can also be implemented in other ways, and any obvious replacements are within the protection scope of the present invention without departing from the concept of the technical solution.

In order to make it easier for those skilled in the art to understand the improvements of the present invention relative to the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are also omitted in this application document, One of ordinary skill in the art would realize that these omitted elements may also constitute the subject matter of the present invention.

Claims (6)

1. The construction method of the assembled shear wall is characterized by comprising the following steps:

firstly, prefabricating a prestressed bottom plate, an upper shear wall body and a lower shear wall body;

when an upper shear wall body and a lower shear wall body are prefabricated, extending steel bars are reserved at the top end of the lower shear wall body and the bottom end of the upper shear wall body, shear assemblies which can be matched with each other are pre-buried at the top end of the lower shear wall body and the bottom end of the upper shear wall body, each shear assembly comprises a shear key and a shear groove, each shear key comprises a base plate buried in the wall body and two side plates which are arranged at intervals and extend outwards from the wall body, the near ends of the side plates are fixedly connected to the front surface of the base plate, the far ends of the two side plates are opened to form an opening end, an interval adjusting part is arranged between the two side plates, each shear groove comprises a positioning groove which can contain the side plates of each shear key, the depth of each positioning groove is smaller than the length of the side plates;

secondly, field assembly;

2.1 hoisting the prefabricated prestressed bottom plate: horizontally hoisting the prefabricated prestressed bottom plate onto a beam and enabling one end of the prefabricated prestressed bottom plate to be lapped at the top end of the fixed lower shear wall body, wherein the lapping position of the prefabricated prestressed bottom plate and the lower shear wall body is controlled at the outer side of the notch of the positioning groove, so that the prefabricated prestressed bottom plate is prevented from shielding the positioning groove to influence the insertion of a subsequent shear key;

2.2, hoisting the upper shear wall: vertically hoisting the upper shear wall body above the fixed lower shear wall body, adjusting the position of the upper shear wall body to enable the shear resistant keys to be aligned with the positioning grooves, keeping the lifting force of the sling on the upper shear wall body, and after the shear resistant keys completely fall into the positioning grooves, the extended steel bars at the top end of the lower shear wall body are lapped with the extended steel bars at the bottom end of the upper shear wall body, then adjusting the distance adjusting part to expand the width of the distance between the two side plates of the shear key so that the side plates tightly abut against the side wall of the positioning groove, then the lifting force of the sling on the upper shear wall body is removed, the upper shear wall body is fixed above the lower shear wall body by means of the constraint force of the shear resistant groove on the shear resistant key, at the moment, the end of the prefabricated prestressed bottom plate, which is lapped on the lower shear wall body, is positioned in a gap between the bottom end of the upper shear wall body and the top end of the lower shear wall body and is positioned outside the side plate of the shear key;

2.3, reinforcing bars and pouring concrete of the laminated floor slab: and reinforcing steel bars are arranged on the prefabricated prestressed bottom plate, concrete is poured, the prefabricated prestressed bottom plate and a concrete superposed layer above the prefabricated prestressed bottom plate form a superposed floor slab, a part of concrete is poured in and fills a gap between the bottom end of the upper shear wall body and the top end of the lower shear wall body, a gap between the shear key and the shear groove and a gap between the two side plates of the shear key in the pouring process, and the upper shear wall body, the lower shear wall body and the superposed floor slab are connected into a whole by utilizing the cast-in-place concrete.

2. The fabricated shear wall construction method according to claim 1, wherein:

the distance adjusting part arranged on the shear key comprises two screw rods arranged horizontally in opposite directions and a joint nut, the root parts of the screw rods are fixedly connected with the inner side wall of the side plate, the rotating directions of the threads on the two screw rods are opposite, and the rotating directions of the threads at the two ends of the joint nut are opposite and are respectively connected with one screw rod through threads;

in step 2.2, the joint nut is rotated by a wrench so that the screw rod expands the width of the gap between the two side plates of the shear key.

3. The fabricated shear wall construction method according to claim 1, wherein:

when the lower shear wall body and the upper shear wall body are prefabricated in the first step, the top end of the lower shear wall body is unfilled by forming through a mold, so that a shoulder is formed, YBZ main reinforcement steel bars of the lower shear wall body extend out of the shoulder, and YBZ main reinforcement steel bars of the upper shear wall body extend out of the position, opposite to the shoulder of the lower shear wall body, of the bottom end of the upper shear wall body;

in step 2.2, after the upper shear wall body is fixed above the lower shear wall body, the main reinforcing steel bars of the upper shear wall body and the YBZ main reinforcing steel bars of the lower shear wall body are overlapped at the position above the shoulder part;

in step 2.3, a part of concrete is poured into the shoulder part, the top unfilled corner of the lower shear wall body is filled with concrete, and the overlapped YBZ main reinforcing steel bars are wrapped.

4. The fabricated shear wall construction method according to claim 2, wherein:

a concrete pouring through hole is formed in the part, extending out from the wall body, of the side plate, the highest point of the concrete pouring through hole in the vertical direction is higher than the upper surface of the prefabricated prestressed bottom plate, and the connecting point of the screw rod and the side plate is located below the concrete pouring through hole;

in step 2.3, when reinforcing steel bars on the prefabricated prestressed bottom plate, a part of steel bars pass through the concrete pouring through holes; when concrete is poured, the concrete pouring through hole is filled with the concrete.

5. The fabricated shear wall construction method according to claim 2, wherein:

when YBZ main reinforcing steel bars of the upper shear wall body and the lower shear wall body are lapped, the lapping length S is controlled to be larger than or equal to 35d, wherein d is the diameter of YBZ main reinforcing steel bars.

6. The fabricated shear wall construction method according to any one of claims 1 to 3, wherein:

when the lower shear wall body and the upper shear wall body are prefabricated in the first step, before the die is filled, the shear keys are completely inserted into the positioning grooves, the distance adjusting parts are adjusted to enable the side plates of the shear keys to tightly abut against the side walls of the positioning grooves, the shear keys and the shear grooves are fixedly connected together, and then the shear keys and the shear grooves which are connected together are correspondingly placed in dies for casting the upper shear wall body and the lower shear wall body; after the mold is loosened, matching marks are made on the upper shear wall body and the lower shear wall body which are obtained by molding, and finally the distance between the two side plates is narrowed by adjusting the distance adjusting part, and the upper shear wall body and the lower shear wall body are transported after being separated;

and 2.2, when the upper shear wall body is hoisted in the step 2.2, selecting the upper shear wall body which is matched with the current lower shear wall body in a marking mode.

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