A positioning device for vertical reinforcement bars of precast shear walls

Abstract

This utility model discloses a positioning device for vertical reinforcement bars in precast shear walls, relating to the field of building construction technology. The device includes a first fixing frame, a second fixing frame, a positioning steel sleeve, a tightening component, and a PVC reinforcement bar protective cap. The first and second fixing frames are slidably connected via nested Y-direction square tubes, allowing for frame width adjustment and locking via the tightening component. The positioning steel sleeve is fitted onto the X-direction circular tube of the fixing frame via a short X-direction circular tube, allowing for lateral sliding adjustment and locking. Its Z-direction circular tube forms a reinforcement bar positioning channel. The PVC protective cap is fitted onto the top of the Z-direction circular tube. This device adapts to different shear wall sizes through frame sliding adjustment, achieves precise positioning of reinforcement bars in the X, Y, and Z directions using the positioning steel sleeve, and enables rapid locking via the tightening component. The overall structure is lightweight and rigid, effectively improving construction efficiency and positioning accuracy, and is suitable for various precast shear wall vertical reinforcement bar installation scenarios.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, specifically relating to a positioning device for vertical reinforcing bars in precast shear walls. Background Technology

[0002] In precast concrete monolithic shear wall structures, the precast shear wall serves as the primary lateral force resisting component, and its installation location and reinforcement quality significantly impact the structure's bearing capacity and seismic performance. After prefabrication in the factory, the precast shear walls are transported to the construction site for installation. The vertical reinforcement of the precast shear walls is typically connected using grouted sleeves. The lower precast shear wall's vertical reinforcement extends into the upper precast shear wall's sleeve, and grouting is used to form a unified structure.

[0003] The core of prefabricated buildings is "reliable connection." Common problems encountered during prefabricated wall installation include: 1. Inaccurate installation position of the lower prefabricated wall, causing misalignment of the pre-reserved connecting steel bars; 2. Traditional methods for controlling the protective layer thickness involve using cement mortar or plastic spacers, but these are prone to displacement and falling off, resulting in poor positioning and failing to meet the high-precision positioning requirements of the connecting steel bars in prefabricated components. This leads to insufficient protective layer for the steel bars, affecting the durability and load-bearing capacity of the components; 3. During concrete pouring, concrete laitance coats the surface of the prefabricated wall connecting steel bars, forming a weak interface layer and weakening the mechanical interlocking force between the steel bars and the subsequent concrete; 4. The diameter of the prefabricated wall connecting steel bars is generally no more than 20mm, making them prone to displacement during concrete pouring and vibration. Inaccurate positioning of the pre-reserved connecting steel bars hinders on-site installation, requiring manual adjustment of the steel bar position beforehand, affecting construction progress and increasing costs. Therefore, a dedicated positioning device needs to be designed to address these issues.

[0004] Chinese Patent No. CN220790647U discloses a vertical rebar positioning device for prefabricated shear walls, relating to the field of prefabricated building technology. The device includes a base and a sleeve disposed inside the base. A first adjustment mechanism is disposed outside the sleeve. The first adjustment mechanism includes a frame disposed outside the sleeve and a longitudinal adjustment unit disposed between the frame and the sleeve. The longitudinal adjustment unit includes a threaded rod movably disposed on the inner wall of the frame and a sliding sleeve threaded to the outer circumference of the threaded rod. A second adjustment mechanism is disposed outside the first adjustment mechanism. The second adjustment mechanism includes connecting rods disposed on both sides of the frame and a transverse adjustment unit disposed between the connecting rods and the frame. This utility model is a vertical rebar positioning device for prefabricated shear walls. Through the first and second adjustment mechanisms, it accurately positions the reserved rebar, meeting the positioning needs of prefabricated components. The first adjustment mechanism of the aforementioned device achieves longitudinal adjustment through the engagement of a threaded rod and a sliding sleeve within the frame, while the second adjustment mechanism achieves lateral adjustment through a connecting rod and a lateral adjustment unit (moving cylinder and locking element). This requires adjustment layer by layer via threaded transmission, making the adjustment process cumbersome. Furthermore, the threaded structure is susceptible to contamination by concrete, leading to jamming and impacting construction efficiency. Therefore, it is imperative for those skilled in the art to solve these technical problems. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the existing technology, improve the positioning stability and accuracy of precast shear walls, and increase the installation efficiency of shear walls.

[0006] The technical solutions adopted in this utility model are as follows:

[0007] A precast shear wall vertical reinforcement positioning device, comprising:

[0008] The first and second fixed frames are both welded together from square tubes in the X, Y, and Z directions and two parallel round tubes in the X direction. The Y-direction square tube of the second fixed frame is smaller than the Y-direction square tube of the first fixed frame and is nested into the Y-direction square tube of the first fixed frame and can slide along the Y direction.

[0009] The positioning steel sleeve is composed of a Z-direction circular tube and two X-direction short circular tubes welded together. The X-direction short circular tubes are respectively sleeved on the X-direction circular tubes of the first fixed frame and the second fixed frame, and can slide along the X direction.

[0010] The tightening component includes a butterfly handle, a bolt, and a nut. The nuts are respectively welded around the bolt holes of the Y-direction square tube of the first fixing frame and around the bolt holes of the X-direction short round tube of the positioning steel sleeve. After the bolt passes through the nut, it abuts against the Y-direction square tube of the second fixing frame or the X-direction round tube of the fixing frame.

[0011] The PVC steel bar protective cap is a tubular structure with one end closed, which is fitted onto the top of the Z-direction circular tube.

[0012] By adopting the above technical solution, a bidirectional adjustment structure is achieved through the nested sliding of the first and second fixing frames and the sliding of the positioning steel sleeve along the X-direction circular tube. This, combined with a butterfly handle tightening device, enables rapid locking. This not only satisfies the flexible adaptation of the Y-direction (wall thickness) and X-direction (rebar spacing), but also provides stable support through the rigid frame structure of the fixing frames and positioning steel sleeve, ensuring the overall positioning accuracy of the vertical rebars. Simultaneously, the installation of PVC rebar protective caps effectively prevents the tops of the rebars from being contaminated by laitance during concrete pouring, ensuring the quality of subsequent connections.

[0013] Furthermore, the Y-direction square tube of the first fixing frame has a round hole matching the diameter of the bolt. After the Y-direction square tube of the second fixing frame is inserted into the Y-direction square tube of the first fixing frame, the bolt of the tightening member abuts against the Y-direction square tube of the second fixing frame to fix the Y-direction spacing.

[0014] By adopting the above technical solution, the locking method of directly tightening the Y-direction square tube of the fixing frame with bolts eliminates the need for a complex transmission structure, realizes stepless adjustment of the Y-direction spacing, and adapts to the steel bar spacing requirements of precast shear walls of different thicknesses; the rigid connection between the bolts and nuts ensures that there is no loosening after locking, avoids positioning deviation caused by vibration during construction, and improves installation stability.

[0015] Furthermore, the inner diameter of the short circular tube in the X direction of the positioning steel sleeve is larger than the outer diameter of the circular tube in the X direction of the fixing frame. The tube wall of the short circular tube in the X direction has a circular hole that matches the bolt. The bolt of the tightening member is used to press against the circular tube in the X direction of the fixing frame to fix the X direction position.

[0016] By adopting the above technical solution, the clearance fit design where the inner diameter of the short circular tube in the X direction is larger than the outer diameter of the circular tube of the fixing frame allows the positioning steel sleeve to slide freely in the X direction, facilitating quick adjustment of the lateral spacing of the reinforcing bars in the same row. The locking method, where bolts pass through the pipe wall and directly abut against the circular tube, is simple to operate and provides concentrated locking force, effectively fixing the sleeve position and preventing horizontal displacement of the reinforcing bars during the pouring process.

[0017] Furthermore, the Z-direction circular tube is vertically welded between two X-direction short circular tubes, and the axis of the Z-direction circular tube is perpendicular to the axis of the X-direction circular tube of the fixing frame.

[0018] By adopting the above technical solution, the Z-direction circular pipe is vertically welded between two X-direction short circular pipes to form an "I"-shaped structure, which forms a positioning benchmark of two points in a line. This ensures that the axis of the Z-direction circular pipe is strictly perpendicular to the design position of the reinforcing bar, constrains the verticality of the reinforcing bar, avoids the deviation of the reinforcing bar caused by the inclination of the sleeve, and improves the overall installation accuracy.

[0019] Furthermore, the width of the square tubes in the X, Y, and Z directions of the first and second fixing frames is no more than 4cm, and the circular tubes in the X direction are arranged in parallel with the axial spacing corresponding to the row spacing of the vertical reinforcement of the precast shear wall.

[0020] By adopting the above technical solution, the lightweight design with a square tube width of no more than 4cm reduces the space occupied by the device and avoids conflicts with other components such as formwork and steel reinforcement supports; the X-axis circular tube axis spacing corresponds to the steel reinforcement spacing, ensuring that the installation position of the positioning steel sleeve is consistent with the design drawings, and can be adapted to the standard steel reinforcement layout without additional adjustments.

[0021] Furthermore, the inner diameter of the PVC steel bar protective cap is adapted to the outer diameter of the Z-direction circular pipe, and its length covers the exposed portion of the top end of the Z-direction circular pipe.

[0022] By adopting the above technical solution, the design of the PVC protective cap having an inner diameter that matches the outer diameter of the Z-direction circular pipe and a length that covers the exposed part can tightly wrap the top of the reinforcing bar, effectively preventing the concrete laitance from contacting the reinforcing bar, preventing the formation of a weak interface layer, ensuring the bond strength between the reinforcing bar and the post-poured concrete, and improving the reliability of the joint connection.

[0023] Furthermore, the nut of the tightening component is coaxially welded to the corresponding bolt hole, one end of the bolt is fixedly connected to the butterfly handle, and the other end passes through the nut and contacts the surface of the sliding component.

[0024] By adopting the above technical solution, the coaxial welding of the nut and bolt hole ensures that the force direction is perpendicular to the surface of the sliding part when the bolt is tightened, avoiding locking failure due to eccentricity; the integrated connection between the butterfly handle and the bolt eliminates the need for tools, and can be manually tightened or loosened quickly, significantly improving construction efficiency, especially suitable for scenarios with frequent on-site adjustments.

[0025] Furthermore, the number of positioning steel sleeves is consistent with the number of vertical reinforcing bars in the same row of the precast shear wall, and the axis of each Z-direction circular tube corresponds to the design position of the vertical reinforcing bar.

[0026] By adopting the above technical solution, the number of positioning steel sleeves is consistent with the number of reinforcing bars, and the axis corresponds one-to-one with the design position. This ensures that each vertical reinforcing bar has an independent positioning constraint, avoiding mutual interference caused by multiple reinforcing bars sharing the positioning structure. The axis of each sleeve accurately corresponds to the design position, ensuring that the reinforcing bars meet the drawing requirements after installation and reducing the amount of subsequent correction work.

[0027] This utility model has the following beneficial effects:

[0028] This solution combines two fixing frames to position the Z-axis reinforcement of precast walls of varying thicknesses. The locator is placed on a reinforcement support, which is adjusted to maintain a horizontal position, ensuring the positioning sleeve is vertical. A protective sleeve is installed on the positioning sleeve to prevent contamination of the shear wall reinforcement during concrete pouring. A threaded protective sleeve is installed on the wing screw to prevent contamination of the screw by the cast-in-place concrete, thus preventing it from affecting screw disassembly. This reinforcement locator is easy to manufacture and operate, and is suitable for precast shear walls of different thicknesses and reinforcement spacings, improving the accuracy of vertical reinforcement positioning in precast shear walls. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the middle fixed frame 1;

[0031] Figure 3 for Figure 1 Schematic diagram of the structure of the middle fixing frame 2;

[0032] Figure 4 for Figure 1 Schematic diagram of the central positioning steel sleeve;

[0033] Figure 5 for Figure 1 Schematic diagram of the structure of the central tightening component;

[0034] Wherein: 1-First fixing frame; 2-Second fixing frame; 3-Positioning steel sleeve; 31-Z-direction round tube; 32, 33-X-direction short round tube; 4-Tightening part; 41-Butterfly handle; 42-Bolt; 43-Nut; 5-PVC steel bar protective cap. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0036] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0037] Reference Figure 1 , Figure 2 , Figure 3, Figure 4 , Figure 5 As can be seen, in this utility model, a positioning device for vertical reinforcement of precast shear wall, the first fixing frame 1 and the second fixing frame 2 are connected by nesting Y-direction square tubes. The Y-direction square tube of the second fixing frame 2 is inserted into the Y-direction square tube of the first fixing frame 1 and can slide along the Y direction. The bolt 42 of the tightening member 4 passes through the round hole of the Y-direction square tube of the first fixing frame 1 and abuts against the Y-direction square tube of the second fixing frame 2 to fix the Y-direction spacing. The two X-direction short round tubes 32 and 33 of the positioning steel sleeve 3 are respectively sleeved on the X-direction round tubes of the first fixing frame 1 and the second fixing frame 2 and can slide along the X direction. The bolt 42 of the tightening member 4 passes through the round hole in the wall of the X-direction short round tube 32 and is tightened by the bolt 42. The X-direction circular tube of the fixed frame is used to fix the X-direction position. The Z-direction circular tube 31 is vertically welded between the two X-direction short circular tubes 32 and 33, and its top end is fitted with a PVC steel bar protective cap 5. The nuts 43 of the tightening parts 4 are coaxially welded to the Y-direction square tube bolt holes of the first fixed frame 1 and the X-direction short circular tube 32 bolt holes of the positioning steel sleeve 3. One end of the bolt 42 is fixedly connected to the butterfly handle 41, and the other end passes through the nut 43 and contacts the surface of the corresponding sliding part. The number of positioning steel sleeves 3 is consistent with the number of vertical steel bars in the same row. The axis of each Z-direction circular tube 31 corresponds to the design position of the steel bar, and the distance between the X-direction circular tube axes of the first fixed frame 1 and the second fixed frame 2 corresponds to the steel bar row spacing.

[0038] In one embodiment, after the precast wall is installed, the beam and slab formwork is erected, the composite slab is installed, and the beam and slab reinforcement is tied. Before pouring concrete, the position of the vertical reinforcement of the precast shear wall is adjusted and tied according to the drawings. Two steel support trestles are set at the support frame location, and the horizontal elevation is measured so that the elevation of the support trestles is 2cm higher than the cast-in-place floor surface.

[0039] Assemble the first fixing frame 1 and the second fixing frame 2. Insert the Y-direction horizontal tube 23 of the second fixing frame 2 into the Y-direction steel tube 13 of the fixing frame 1. Keep the butterfly handle 41 on the first fixing frame 1 in a loose state. Adjust the spacing of the fixing frames according to the spacing of the two rows of vertical steel bars in the precast wall. Adjust the position of the positioning sleeve according to the spacing of the vertical steel bars on the same side of the precast wall, and put the positioning sleeve 31 on the vertical steel bars of the precast wall. Place the fixing frame on the trestle with the elevation already marked, ensuring that the fixing frame is horizontal and that the positioning sleeve 31 is kept vertical. Tighten the tightening part 4. Put the PVC steel bar protective cap on the vertical steel tube of the positioning steel sleeve.

[0040] Securely tie the first fixing frame 1 and the second fixing frame 2 to the steel bar stirrups to ensure that the fixing frames do not move and to guarantee the accuracy of steel bar positioning.

[0041] In one embodiment, firstly, the first fixing frame 1 and the second fixing frame 2 slide through the nested Y-direction square tubes, and the overall frame width is adjusted according to the thickness of the shear wall. The bolt 42 of the tightening member 4 passes through the round hole of the first fixing frame 1 and abuts against the second fixing frame 2 to form a stable Y-direction reference. The X-direction short round tubes 32 and 33 of the positioning steel sleeve 3 are sleeved on the X-direction round tube of the fixing frame and slide along the X-direction to adapt to the transverse spacing of the reinforcing bars. The position is locked by the tightening member 4, and its Z-direction round tube 31 is vertically welded between the X-direction short round tubes to form a positioning channel for the vertical reinforcing bars. Five PVC rebar protective caps are fitted onto the top of the Z-direction circular tube 31 to prevent concrete from contaminating the rebar. During installation, the rebar passes through the Z-direction circular tube 31. The rigid frame of the fixing bracket is used to weld the X, Y, and Z-direction square tubes and use the "two points and one line" positioning benchmark. The Z-direction circular tube is perpendicular to the X-direction circular tube to ensure verticality. The butterfly handle 41 of the tightening part enables quick locking. The overall structure is designed with lightweight square tubes with a width of ≤4cm to reduce construction interference. Finally, the precise positioning of the rebar in the X, Y, and Z directions is achieved through the rigid constraints and sliding adjustments of each component.

[0042] Working principle: Utilizing the Y-direction nested sliding structure of the first fixed frame 1 and the second fixed frame 2, the overall frame width is adjusted according to the shear wall thickness requirements. The bolts 42 of the tightening component 4 directly abut against the Y-direction square tube of the second fixed frame 2 to achieve locking, forming a stable lateral reference. The positioning steel sleeve 3 achieves lateral sliding through the gap fit between the X-direction short circular tubes 32 and 33 and the X-direction circular tube of the fixed frame. After adjusting its position according to the designed spacing of the reinforcing bars, it is fixed by the bolts 42 of the tightening component 4 against the circular tube. The vertically welded Z-direction circular tube 31 forms a guide channel for the vertical reinforcing bars, and the number and position of each sleeve strictly correspond to the reinforcing bars in the same row. The design layout includes the following steps: During installation, vertical reinforcing bars pass through the Z-direction circular pipe 31. The rigid welded frame of the fixing bracket, along with the X, Y, and Z-direction square pipes and the preset parameters of "X-direction circular pipe axis spacing corresponding to reinforcing bar spacing," ensures the positioning accuracy of the reinforcing bars in the plane. The perpendicular relationship between the Z-direction circular pipe 31 and the X-direction circular pipe ensures the verticality of the reinforcing bars. PVC reinforcing bar protective caps 5 cover the top of the Z-direction circular pipe to prevent slurry from contaminating the reinforcing bar connection ends during concrete pouring. The butterfly handle 41 of the tightening component 4 enables tool-free, quick operation. The coaxial welding of the nut 43 and the bolt hole ensures uniform transmission of locking force, preventing displacement of sliding parts.

[0043] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A prefabricated shear wall vertical steel bar positioning device, characterized in that, include: The first fixed frame (1) and the second fixed frame (2) are both welded together by square tubes in the X, Y and Z directions and two parallel round tubes in the X direction. The Y-direction square tube of the second fixed frame (2) is smaller than the Y-direction square tube of the first fixed frame (1) and is nested into the Y-direction square tube of the first fixed frame (1) and can slide along the Y direction. The positioning steel sleeve (3) is composed of a Z-direction round tube (31) and two X-direction short round tubes (32, 33) welded together. The X-direction short round tubes (32, 33) are respectively sleeved on the X-direction round tubes of the first fixed frame (1) and the second fixed frame (2) and can slide along the X direction. The tightening component (4) includes a butterfly handle (41), a bolt (42) and a nut (43). The nut (43) is welded to the bolt holes of the Y-direction square tube of the first fixing frame (1) and the bolt holes of the X-direction short round tube (32) of the positioning steel sleeve (3). The bolt (42) passes through the nut (43) and abuts against the Y-direction square tube of the second fixing frame (2) or the X-direction round tube of the fixing frame. The PVC steel bar protective cap (5) is a tubular structure with one end closed, which is fitted onto the top of the Z-direction circular tube (31).

2. The apparatus of claim 1, wherein, The first fixing bracket (1) has a round hole on its Y-direction square tube that matches the diameter of the bolt (42). After the Y-direction square tube of the second fixing bracket (2) is inserted into the Y-direction square tube of the first fixing bracket (1), the bolt (42) of the tightening member (4) is used to tighten the Y-direction square tube of the second fixing bracket (2) to fix the Y-direction spacing.

3. The apparatus of claim 1, wherein, The inner diameter of the X-direction short round tube (32, 33) of the positioning steel sleeve (3) is larger than the outer diameter of the X-direction round tube of the fixing frame. The tube wall of the X-direction short round tube (32) is provided with a round hole that matches the bolt (42). The X-direction position is fixed by the bolt (42) of the tightening member (4) pressing against the X-direction round tube of the fixing frame.

4. The apparatus of claim 1, wherein, The Z-direction circular tube (31) is vertically welded between two X-direction short circular tubes (32, 33), and the axis of the Z-direction circular tube (31) is perpendicular to the axis of the X-direction circular tube of the fixing frame.

5. The apparatus of claim 1, wherein, The width of the square tubes in the X, Y, and Z directions of the first fixing frame (1) and the second fixing frame (2) is no more than 4cm. The circular tubes in the X direction are arranged in parallel and the axial spacing corresponds to the row spacing of the vertical steel bars of the precast shear wall.

6. The apparatus of claim 1, wherein, The inner diameter of the PVC steel bar protective cap (5) is adapted to the outer diameter of the Z-direction circular pipe (31), and its length covers the exposed part of the top of the Z-direction circular pipe (31).

7. The apparatus of claim 1, wherein, The nut (43) of the tightening member (4) is welded coaxially with the corresponding bolt hole. One end of the bolt (42) is fixedly connected to the butterfly handle (41), and the other end passes through the nut (43) and contacts the surface of the sliding component.

8. The apparatus of claim 1, wherein, The number of positioning steel sleeves (3) is consistent with the number of vertical reinforcing bars in the same row of the precast shear wall, and the axis of each Z-direction circular pipe (31) corresponds to the design position of the vertical reinforcing bar.

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