Construction method of hollow shear wall

Abstract

The application discloses a construction method of a hollow shear wall, and comprises the following steps: S1, fixing a lower assembly unit, and exposing a first connecting piece at the top of the lower assembly unit; S2, pouring a floor slab at the top of the lower assembly unit, the first connecting piece penetrating through the floor slab, and exposing a connecting end of the first connecting piece; and S3, after the concrete in S2 is solidified, connecting a second connecting piece of an upper assembly unit with the first connecting piece, and realizing the prefabrication of the upper assembly unit and the lower assembly unit. By using the construction method of the hollow shear wall, reliable fixation of the upper and lower assembly units can be realized without auxiliary temporary support during the assembly of the assembly unit.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building construction, and more specifically, to a construction method for hollow shear walls. Background Technology

[0002] In the construction of prefabricated concrete shear wall structures, the vertical connection of precast wall panels is a crucial factor determining project efficiency and safety. Currently, the mainstream connection method is wet-work connection, and its conventional construction process is as follows: first, the lower wall panel is installed in place, and after its connection joints have reached a certain strength, the upper precast wall panel is hoisted in. After the upper wall panel is hoisted in place, axial deviation correction and temporary fixation are required.

[0003] However, when using the traditional wet connection method, after the upper precast wall panel is hoisted to the predetermined position, the grout or post-cast concrete at its vertical connection node has not yet hardened, and it can hardly provide effective flexural bearing capacity and overturning moment resistance in the early stage of curing. In order to resist wind loads and accidental impact loads during construction and to ensure the overall stability of the wall before the grout solidifies, current construction specifications and safety regulations require that a large number of temporary diagonal braces or support rods be erected on both sides of the wall panel (usually in the horizontal direction of the wall panel) to rigidly constrain the upper wall panel to the lower floor slab or ground to prevent the wall panel from overturning or displacing.

[0004] This construction method, which relies on a large number of temporary supports, involves complex and time-consuming construction procedures: the installation, adjustment, reinforcement, and subsequent dismantling of temporary diagonal braces not only significantly increases the on-site work procedures but also restricts the construction flow rhythm, making it difficult to fully leverage the advantages of rapid construction of prefabricated buildings. Summary of the Invention

[0005] The purpose of this invention is to provide a construction method for hollow shear walls. Using this construction method, the upper and lower assembly units can be reliably fixed without the need for auxiliary temporary supports during the assembly process.

[0006] To achieve the above objectives, the present invention provides a construction method for a hollow shear wall, comprising: S1. Fix the lower assembly unit and expose the first connector at the top of the lower assembly unit; S2. A floor slab is poured on top of the lower assembly unit, and the first connector passes through the floor slab, exposing the connecting end of the first connector; S3. After the concrete in S2 has solidified, connect the second connector of the upper assembly unit to the first connector to achieve pre-fixation of the upper assembly unit and the lower assembly unit.

[0007] Preferably, in S3, the second connector is screwed to the connecting end.

[0008] Preferably, after S1 is completed and before S2 begins, insert ribs are fixed into the cavity at the top of the lower assembly unit; In S2, during the process of pouring the floor slab, concrete is poured into the cavity where the reinforcing bars are located; In S3, the insert rod is inserted into the cavity of the upper assembly unit.

[0009] Preferably, the fixing ribs in the cavity at the top of the lower assembly unit include: S11. Fix the connecting parts at the top of the lower assembly unit; S12. Insert the insert rod into the cavity at the top of the lower assembly unit and fix the insert rod to the connector. The bottom of the reinforcing bar is equipped with a baffle, which is located in the cavity at the top of the lower assembly unit. The baffle works with the side wall of the cavity to block concrete.

[0010] Preferably, in S11, both ends of the connector are fixedly connected to the first connector at the top of the lower assembly unit.

[0011] Preferably, in S2, during the process of pouring the floor slab, the floor slab pouring mold cooperates with the lower assembly unit to form a concrete pouring cavity, and the connector is connected with the reinforcing bar and the first connector, which, together with the concrete, improves the connection strength between the lower assembly unit and the floor slab.

[0012] Preferably, in S12, after the insert and connector are fixed, the parts protruding from the lower assembly unit are not at the same height.

[0013] Preferably, the method further includes step S4, injecting concrete into the cavity of the upper assembly unit, and after the concrete solidifies, completing the fixation of the hollow shear wall.

[0014] Preferably, injecting concrete into the cavity of the upper assembly unit includes: sending a delivery pipe to the bottom of the cavity and injecting concrete into the cavity through the delivery pipe.

[0015] Preferably, the cavity of the upper assembly unit accommodates at least one insert rod.

[0016] According to the above technical solution, each assembly unit of the present invention includes a first connecting member and a second connecting member. After the first connecting member and the second connecting member of two adjacent assembly units along the height direction are connected, the two adjacent assembly units along the height direction can be fixed. Therefore, during the assembly of this assembly unit, reliable fixing of the upper and lower assembly units can be achieved without the need for auxiliary temporary supports, significantly improving work efficiency and reducing on-site construction procedures.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart of a construction method for a hollow shear wall; Figure 2 This is a flowchart of a process for fixing insert rods in the cavity at the top of a lower-level assembly unit; Figure 3 This is a schematic diagram of the bottom of an assembly unit; Figure 4 yes Figure 3 Sectional view 1-1; Figure 5 This is a schematic diagram showing the connection between the top of an assembly unit and the floor slab. Figure 6 yes Figure 5 2-2 is a cross-sectional view.

[0019] Figure 7 This is a schematic diagram of a pre-connected state of a hollow shear wall; Figure 8 This is a schematic diagram of the connection state of a hollow shear wall; Figure 9 yes Figure 8 A schematic diagram of 1-1; Figure 10 yes Figure 8 Sectional view 2-2; Figure 11 This is a structural schematic diagram of a second connector.

[0020] Explanation of reference numerals in the attached figures Unit 1 body 21 First connector; 22 Second connector; 221 Connecting body; 222 Connecting hole; 231 First reinforcing bar; 232 Second reinforcing bar; 24 Protective cavity; 241 Angle steel; 242 Formwork top plate 3. First connecting surface; 31. Insert rod; 32. Baffle; 4. Second connecting surface; 41. Cavity; 10th floor slab. Detailed Implementation The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] In this invention, unless otherwise stated, directional terms included in the terminology represent only the orientation of the term in its normal use or as commonly understood by those skilled in the art, and should not be regarded as a limitation on the term.

[0022] See Figure 1 The construction method for a hollow shear wall includes: S1. Fix the lower assembly unit and expose the first connector 21 at the top of the lower assembly unit; First, the lower assembly unit is hoisted to its designed position and secured. The lower assembly unit includes a unit body 1 and a first connector 21 embedded in the top of the unit body 1. The unit body 1 is a precast hollow concrete wall with a series of vertical holes along its height. The first connector 21 is a connecting bar embedded in the top of the unit body 1, with its lower end anchored in the concrete of the unit body 1 and its upper end extending beyond the top surface of the unit body 1. After the lower assembly unit is secured, the connecting end of the first connector 21 protrudes from the top surface of the lower assembly unit, facilitating subsequent connection with the second connector 22 of the upper assembly unit.

[0023] S2. Cast a floor slab 10 on top of the lower assembly unit. The first connector 21 passes through the floor slab 10 and exposes the connecting end of the first connector 21. After the lower assembly unit is fixed, the floor slab 10 is poured. The floor slab 10 is poured on top of the lower assembly unit, and the pouring mold of the floor slab 10 mates with the top of the lower assembly unit to form a concrete pouring cavity. Before pouring the floor slab 10, the first connector 21 is pre-embedded in the top of the lower assembly unit and extends upwards. During the pouring of the floor slab 10, concrete fills the pouring cavity, and the first connector 21 passes through the concrete of the floor slab 10. After the concrete of the floor slab 10 has solidified, the connecting end of the first connector 21 protrudes from the upper surface of the floor slab 10 to connect with the second connector 22 of the upper assembly unit.

[0024] S3. After the concrete in S2 has solidified, connect the second connector 22 of the upper assembly unit to the first connector 21 to achieve pre-fixation of the upper assembly unit and the lower assembly unit.

[0025] After the concrete of the floor slab 10 reaches a certain strength, the upper assembly unit is hoisted above the lower assembly unit. The upper assembly unit includes a unit body 1 and a second connector 22 pre-embedded in the bottom of the unit body 1. The second connector 22 includes a connecting body 221 with a connecting hole 222. When hoisting the upper assembly unit, the connecting hole 222 of the second connector 22 is aligned with the first connector 21 exposed at the top of the lower assembly unit. As the upper assembly unit descends, the first connector 21 passes into the connecting hole 222. Through the cooperation of the first connector 21 and the second connector 22, the upper and lower assembly units are pre-fixed.

[0026] Since each assembly unit includes a first connector 21 and a second connector 22, connecting the first connector 21 and the second connector 22 of two adjacent assembly units along the height direction can fix the two adjacent assembly units along the height direction. Therefore, during the assembly of this assembly unit, reliable fixing of the upper and lower assembly units can be achieved without the need for auxiliary temporary supports, which significantly improves work efficiency and reduces on-site construction procedures.

[0027] The second connector 22 includes a connector body 221, which is screwed to the first connector 21. The connector body 221 is provided with a connector hole 222, and the first connector 21 is screwed to the second connector 22 through the connector hole 222. The connector body 221 and the first connector 21 are respectively fixedly connected to the unit body 1.

[0028] The first connector 21 is a connecting longitudinal bar pre-embedded in the top of the unit body 1. The connecting longitudinal bar can be a steel reinforcement structure inside the unit body 1, or the connecting longitudinal bar can be designed separately. When manufacturing the assembly unit, the connecting longitudinal bar is anchored to the steel reinforcement structure inside the unit body 1 so that after the concrete is poured, the connecting longitudinal bar is fixedly connected to the unit body 1.

[0029] The first connector 21, serving as a connecting longitudinal rib, has a threaded end that extends beyond the top surface of the unit body 1. The connecting body 221 of the second connector 22 is a horizontally positioned connecting plate, flush with the bottom of the unit body 1. Multiple connecting holes 222 are provided on the connecting body 221 along the thickness direction of the unit body 1, i.e., the width direction of the wall. The first connector 21 and the connecting hole 222 are arranged in a one-to-one correspondence, meaning the number and position of the first connector 21 perfectly correspond to the number and position of the connecting holes 222. During assembly, the lower first connector 21 extends into the upper connecting hole 22, and tightening the connecting nut achieves a fixed connection between the first connector 21 and the second connector 22.

[0030] The second connector 22 also includes a first reinforcing bar 231 arranged along the first direction and a second reinforcing bar 232 arranged along the second direction. One end of the first reinforcing bar 231 and one end of the second reinforcing bar 232 are respectively fixedly connected to the connecting body 221. The other end of the first reinforcing bar 231 and the other end of the second reinforcing bar 232 extend into the interior of the unit body 1 to connect the connecting body 221 and the unit body 1.

[0031] The first reinforcing bar 231 is installed vertically, and the second reinforcing bar 232 is installed horizontally. One end of the first reinforcing bar 231 and the second reinforcing bar 232 are welded and fixed to the connecting body 221, and the other end extends into the interior of the unit body 1. During the concrete pouring process of the unit body 1, the first reinforcing bar 231 and the second reinforcing bar 232 are poured into the concrete of the unit body 1, serving as anchoring reinforcing bars to firmly anchor the connecting body 221 to the bottom of the unit body 1.

[0032] Preferably, the first reinforcing bar 231 and the second reinforcing bar 232 extending into the unit body 1 are fixed to the reinforcing bar structure in the unit body 1, thereby further improving the reliability of the connection between the second connector 22 and the unit body.

[0033] By setting two anchoring bars, the first bar 231 and the second bar 232, in different directions, the connection between the connecting body 221 and the unit body 1 can be made more reliable, effectively transmitting vertical loads and horizontal shear forces. The diameter and length of the first bar 231 and the second bar 232 need to be determined based on actual stress calculations.

[0034] In this embodiment, preferably, in S3, the second connector is screwed to the connecting end.

[0035] The second connector 22 is provided with a connecting hole 222, and the connecting end of the first connector 21 is provided with a thread. Through the cooperation between the connecting end and the second connector 22, the upper assembly unit and the lower assembly unit can be pre-fixed. At the same time, the upper assembly unit and the lower assembly unit are relatively positioned by the cooperation between the threaded end and the connecting hole 222.

[0036] In this embodiment, the first connector 21 is a threaded rod pre-embedded in the top of the lower assembly unit, with its connecting end extending out of the upper surface of the floor slab 10 and having external threads. The connecting body 221 of the second connector 22 has multiple connecting holes 222 along the width direction of the unit body 1, and the positions of the connecting holes 222 correspond one-to-one with the positions of the first connector 21. When hoisting the upper assembly unit, the connecting holes 222 are aligned with the first connector 21, allowing the first connector 21 to pass through the connecting holes 222. Then, a nut is screwed onto the connecting end of the first connector 21 to achieve a threaded connection.

[0037] By using a screw connection, not only is the upper and lower assembly units pre-fixed, but the relative positioning between the two assembly units is also achieved through the engagement of the screw end and the connecting hole 222. After screw fixing, the connection node has a certain out-of-plane bending bearing capacity, which can resist the temporary out-of-plane loads on the wall panel during construction. This effectively solves the problem of needing to erect temporary supports after hoisting the upper wall, reduces construction procedures, and speeds up construction.

[0038] In this embodiment, preferably, after S1 is completed and before S2 begins, insert ribs are fixed into the cavity at the top of the lower assembly unit; In S2, during the process of pouring the floor slab, concrete is poured into the cavity where the reinforcing bar is located. In S3, the insert rod is inserted into the cavity of the upper assembly unit.

[0039] After the lower assembly unit is fixed, the reinforcing bars 31 are installed. The top of the lower assembly unit has a first connecting surface 3, which includes a cavity 41. The cavity 41 is a vertical through hole inside the unit body 1, extending along the height of the unit body 1. The reinforcing bars 31 are closed rectangular steel bars, with a baffle 32 fixed to their bottom. The shape and size of the baffle 32 are the same as the cross-sectional shape of the cavity 41, and it is preferably made of rubber.

[0040] The reinforcing bar 31, along with the bottom baffle 32, is placed into the cavity 41 at the top of the lower assembly unit. The baffle 32 is located at the bottom of the cavity 41 and cooperates with the side wall of the cavity 41 to seal the bottom of the cavity 41, preventing concrete from leaking out from the bottom of the cavity 41 during subsequent concrete pouring. The upper end of the reinforcing bar 31 extends upward and protrudes from the top surface of the lower assembly unit.

[0041] Subsequently, the floor slab 10 is poured. During the pouring of floor slab 10, concrete is simultaneously poured into the cavity 41 at the top of the lower assembly unit. Because the baffle 32 seals the bottom of the cavity 41, the poured concrete can fill the cavity 41 and wrap the lower half of the reinforcing bar 31. After the concrete solidifies, the reinforcing bar 31 is fixedly connected to the lower assembly unit.

[0042] After the concrete of the floor slab 10 has solidified, the upper assembly unit is hoisted above the lower assembly unit. The bottom of the upper assembly unit has a second connecting surface 4, which includes a cavity 41. During hoisting, the cavity 41 at the bottom of the upper assembly unit is aligned with the protruding reinforcing bar 31 at the top of the lower assembly unit. As the upper assembly unit descends, the reinforcing bar 31 is inserted into the cavity 41 of the upper assembly unit.

[0043] The connection between the second connector 22 and the first connector 21 enables pre-fixation of the hollow shear wall, resisting temporary out-of-plane loads on the wall panels during construction and solving the problem of needing to erect temporary supports after hoisting the upper wall. The reinforcing bar 31 is used for reliable fixing of the upper assembly unit. By fixing the reinforcing bar 31 into the cavity 41 and pouring concrete, the upper and lower assembly units are integrally connected through the reinforcing bar 31 and the subsequent concrete pouring, ensuring the reliability and integrity of the connection node.

[0044] In this embodiment, preferably, the fixing rib in the cavity at the top of the lower assembly unit includes: S11. Fix the connecting parts at the top of the lower assembly unit; After the lower assembly unit is fixed, a connector is installed on top of the lower assembly unit. The connector is used to temporarily fix and position the insert 31, ensuring that the insert 31 is accurately positioned in the cavity 41. The connector can be made of steel bars or structural steel, and its two ends are fixedly connected to the first connector 21 on top of the lower assembly unit. In one embodiment, the insert 31 is set as a rectangular frame, and the insert 31 of the rectangular frame is arranged parallel to the width direction of the wall. Two connectors are provided, and the two connectors are fixedly connected to the two long sides of the rectangular insert 31, respectively. The two connectors are parallel to each other and located on the same horizontal plane.

[0045] S12. Insert the reinforcing bar into the cavity at the top of the lower assembly unit and fix the reinforcing bar to the connector; wherein, a baffle is provided at the bottom of the reinforcing bar, the baffle is located in the cavity at the top of the lower assembly unit, and the baffle cooperates with the side wall of the cavity to block concrete.

[0046] The insert rib 31, along with the bottom baffle 32, is placed into the cavity 41 at the top of the lower assembly unit, with the baffle 32 positioned at the bottom of the cavity 41. The insert rib 31 is then fixedly connected to the connector, which temporarily secures and positions the insert rib 31. After the insert rib 31 is fixed to the connector, the portions protruding from the lower assembly unit are not at the same height. Because the insertion depths of each insert rib 31 into the cavity 41 of the lower assembly unit are different, while the lengths of the insert ribs 31 are the same, the heights of each insert rib 31 protruding from the top surface of the lower assembly unit are also different. Thus, when the upper and lower assembly units are connected, the insertion depths of each insert rib 31 into the cavity 41 of the upper assembly unit are also different, avoiding concentrated stress on all insert ribs 31 at the same height section and improving the stress distribution of the assembly unit.

[0047] The bottom of the reinforcing bar 31 is provided with a baffle 32, which is located in the cavity 41 at the top of the lower assembly unit. The baffle 32 cooperates with the side wall of the cavity 41 to block concrete. The baffle 32 is preferably made of rubber material, and its shape is the same as the cross-sectional shape and size of the cavity 41. It can effectively seal the bottom of the cavity 41 and prevent concrete from leaking down when pouring concrete.

[0048] Temporarily fixing the reinforcing bar 31 with connectors ensures that it remains in the correct position before concrete pouring, preventing displacement or tilting during the pouring process. After the concrete hardens, the reinforcing bar 31 is fixedly connected to the lower assembly unit, while the connectors remain in the structure as reinforcing bars.

[0049] In this embodiment, preferably, in S11, both ends of the connector are fixedly connected to the first connector at the top of the lower assembly unit.

[0050] The connector is located at the top of the lower assembly unit, and its two ends are fixedly connected to the first connector 21 at the top of the lower assembly unit. The connector can be made of steel bars or structural steel, and its two ends are welded or tied to the first connector 21.

[0051] The first connector 21 is a connecting rib pre-embedded in the top of the lower assembly unit, and its connecting end is threaded, with the threaded connecting end protruding from the top surface of the lower assembly unit.

[0052] The insert 31 is a rectangular frame, with the insert 31 arranged parallel to the width direction of the wall. Two connectors are provided, each fixedly connected to one of the two long sides of the rectangular insert 31. The two connectors are parallel to each other and located on the same horizontal plane. By fixing the two connectors to the two long sides of the rectangular insert 31, the position of the insert 31 in the cavity 41 can be kept stable, preventing the insert 31 from tilting or displacing.

[0053] By fixing the connector to the first connector 21, the reinforcing bar 31 can be temporarily fixed and positioned. On the other hand, the connector can also be used as part of the steel reinforcement structure of the floor slab 10, thereby improving the connection strength between the floor slab 10 and the assembly unit.

[0054] In this embodiment, preferably, in S2, during the pouring of the floor slab, the floor slab pouring mold cooperates with the lower assembly unit to form a concrete pouring cavity, and the connector is connected with the reinforcing bar and the first connector, which, together with the concrete, improves the connection strength between the lower assembly unit and the floor slab.

[0055] During the pouring of floor slab 10, the pouring mold of floor slab 10 cooperates with the top of the lower assembly unit to form a concrete pouring cavity. The connector is located on the top of the lower assembly unit, and its two ends are fixedly connected to the first connector 21 and the reinforcing bar 31, respectively. Before pouring floor slab 10, the connector is interconnected with the steel reinforcement structure of floor slab 10, so that the connector becomes part of the steel reinforcement structure of floor slab 10.

[0056] After the concrete is poured, the two connectors are fixed to the reinforcing bars 31 and the first connector 21, forming the steel reinforcement structure of the floor slab 10 above the assembly unit. The connectors, in conjunction with the concrete, improve the connection strength between the lower assembly unit and the floor slab 10. By interconnecting the connectors with the steel reinforcement structure of the floor slab 10, a reliable connection is formed between the floor slab 10 and the assembly unit, resulting in better structural strength for the hollow shear wall.

[0057] In this embodiment, the connector can not only be used for temporary fixing and positioning of the reinforcing bars 31, but also as part of the steel reinforcement structure of the floor slab 10, participating in the load-bearing capacity of the floor slab 10. This simplifies the construction process and improves the overall integrity and connection strength of the structure.

[0058] In this embodiment, preferably, in S12, after the insert is fixed to the connector, the portion protruding from the lower assembly unit is not at the same height.

[0059] By setting different depths to which the inserts 31 are inserted into the cavity 41 of the lower assembly unit, the shear forces on the lower assembly unit are not concentrated in the same location, thus improving the stress distribution of the lower assembly unit. If the lengths of the inserts 31 are all set to be the same, and the lengths of the inserts 31 inserted into the cavity 41 of the lower assembly unit are set to be different, then the remaining lengths of the inserts 31 that can be inserted into the cavity 41 of the upper assembly unit will also be different.

[0060] In practice, multiple cavities 41 can be provided along the length of the wall at the top of the lower assembly unit, and a corresponding insert rib 31 can be provided in each cavity 41. The baffles 32 at the bottom of the insert rib 31 are not all located at the same height in the vertical direction, but are located at at least two different height planes. Since the length of the insert rib 31 is the same, the highest point of the insert rib 31 is not at the same height.

[0061] By placing the bottoms of multiple reinforcing bars 31 at different height planes, the concentrated stress section formed by the reinforcing bars 31 at the same height can be avoided. When the upper and lower assembly units are subjected to horizontal shear force, the shear force is transmitted through the reinforcing bars 31. If the bottoms of all the reinforcing bars 31 are at the same height, a concentrated weak shear section is formed at that height, which is prone to shear failure. However, by staggering the bottoms of the reinforcing bars 31, the shear sections of each reinforcing bar 31 are distributed at different heights, allowing the shear force to be distributed and preventing concentrated shear at a certain section. This improves the stress situation of the assembly unit and enhances the shear bearing capacity and seismic performance of the structure. At the same time, the highest points of the reinforcing bars 31 are also located on different planes, making the stress distribution at the connection between two adjacent assembly units more uniform.

[0062] In this embodiment, preferably, it further includes step S4: injecting concrete into the cavity of the upper assembly unit, and after the concrete solidifies, completing the fixation of the hollow shear wall.

[0063] The portion of the reinforcing bar 31 protruding from the floor slab 10 will be inserted into the cavity 41 of the upper assembly unit. After the first connector 21 and the second connector 22 are fixed together, concrete can be injected into the cavity 41 of the upper assembly unit. The concrete falls into the lower cavity 41, and after the concrete solidifies, the upper assembly unit, the lower assembly unit, and the floor slab 10 located in the middle will be fixed together as one unit by the reinforcing bar 31.

[0064] In this embodiment, the cavity 41 of the upper assembly unit extends along the height of the unit body 1. The upper end of the reinforcing bar 31 is inserted into the cavity 41 at the bottom of the upper assembly unit, but does not reach the top of the cavity 41. Concrete is injected into the cavity 41 of the upper assembly unit, filling the bottom of the cavity 41 and wrapping the upper end of the reinforcing bar 31. After the concrete solidifies, the reinforcing bar 31 is fixedly connected to the upper assembly unit, thereby completing the fixation of the hollow shear wall.

[0065] In this embodiment, preferably, injecting concrete into the cavity of the upper assembly unit includes: sending a delivery pipe to the bottom of the cavity and injecting concrete into the cavity through the delivery pipe.

[0066] Since the upper assembly unit typically has a certain height, an appropriate pouring method is required to ensure that all poured concrete falls into the bottom cavity 41. In one embodiment, a delivery pipe is inserted from the top of the cavity 41 of the upper assembly unit to the bottom of the upper assembly unit, and concrete is directly added to the bottom of the cavity 41 through the delivery pipe. In another embodiment, a hole is drilled on the side of the upper assembly unit, slightly higher than the height of the reinforcing bar 31, and then a delivery pipe is inserted into the cavity 41 through the hole, and concrete is injected into the cavity 41 through the delivery pipe, with the concrete falling to the bottom of the cavity 41.

[0067] By delivering the concrete to the bottom of cavity 41 through the delivery pipe, it is ensured that the concrete accurately reaches the bottom of cavity 41, preventing concrete from accumulating or blocking in the middle of cavity 41. At the same time, pouring concrete from the bottom of cavity 41 upwards allows the concrete to fully fill the bottom space of cavity 41, ensuring that the reinforcing bar 31 is reliably wrapped by the concrete and guaranteeing the anchorage quality of the connection node.

[0068] In this embodiment, preferably, at least one of the inserts is accommodated in the cavity of the upper assembly unit.

[0069] Since each cavity 41 is an independent, interconnected space, concrete needs to be poured into each cavity 41 separately when pouring concrete into the upper cavity 41. If each cavity 41 corresponds to one reinforcing bar 31, the concrete pouring work will be very complicated, requiring the insertion of a delivery pipe into each cavity 41 to fill the bottom of each cavity 41.

[0070] Multiple adjacent cavities 41 are merged into a single cavity 41 by combining holes, ensuring that each cavity 41 of the upper assembly unit corresponds to multiple reinforcing bars 31. Concrete is then poured into each cavity 41, ensuring that the portion of the upper assembly unit into which the reinforcing bars 31 extend is filled with concrete. This method of combining holes ensures the interfacial shear capacity and stress characteristics while reducing the number of pours.

[0071] Specifically, "joining holes" refers to removing the concrete partitions between two or more adjacent vertical holes within a certain height range at the bottom of the upper precast hollow wall panel, so that these originally independent holes are connected at the bottom to form a large cavity. In this way, multiple reinforcing bars 31 extending from the lower wall panel can be inserted into the same large cavity at the same time, and multiple reinforcing bars 31 can be wrapped at once during the second pour of concrete, thereby reducing the number of pours.

[0072] The concatenation of holes only occurs in the bottom connection area of ​​the assembly unit, not along the entire wall height. The upper part of the upper wall panel retains the original independent vertical holes to maintain the wall's lightweight nature, reduce seismic forces, and ensure that the top inserts 31 correspond one-to-one with the cavities. Adjacent holes are only connected at the bottom within the height range where they need to connect with the lower inserts 31, forming a locally connected large cavity. The height of the concatenation is generally taken as the anchorage length of the insert 31 plus a certain structural height, specifically determined by shear calculations and anchorage requirements.

[0073] After the holes are combined, the contact area between the post-cast concrete and the precast wall panel increases, and the shear cross-section of the interface also increases. Originally, when multiple small holes were poured separately, each hole wall was an independent shear surface; after the holes are combined, a whole post-cast zone is formed, the bonding area between the concrete and the hole wall and the mechanical interlocking effect are stronger, and the shear bearing capacity of the interface may actually increase. At the same time, multiple reinforcing bars 31 are wrapped by the same piece of post-cast concrete, the stress is more uniform, stress concentration in individual holes is avoided, and the stress characteristics of the interface are improved.

[0074] Therefore, by using a combined-hole method, the number of pouring operations can be reduced while ensuring the shear bearing capacity and stress characteristics of the interface, thus improving construction efficiency. In specific implementation, the appropriate number of combined holes and pouring method can be selected based on the specific project conditions. The more combined holes, the fewer the pouring operations, and the higher the construction efficiency; however, it is also necessary to ensure that the cross-sectional dimensions of the cavity 41 after combining the holes meet the requirements for the installation of the reinforcing bars 31 and the pouring of concrete, and to ensure that the shear bearing capacity of the interface meets the design requirements.

[0075] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. 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 simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0076] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0077] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A construction method for a hollow shear wall, characterized in that, include: S1. Fix the lower assembly unit and expose the first connector at the top of the lower assembly unit; S2. A floor slab is poured on top of the lower assembly unit, and the first connector passes through the floor slab, exposing the connecting end of the first connector; S3. After the concrete in S2 has solidified, connect the second connector of the upper assembly unit to the first connector to achieve pre-fixation of the upper assembly unit and the lower assembly unit.

2. The construction method for hollow shear walls according to claim 1, characterized in that, In S3, the second connector is screwed to the connecting end.

3. The construction method for hollow shear walls according to claim 1, characterized in that, After S1 is completed and before S2 begins, fix the insert rods into the cavity at the top of the lower assembly unit; In S2, during the process of pouring the floor slab, concrete is poured into the cavity where the reinforcing bar is located. In S3, the insert rod is inserted into the cavity of the upper assembly unit.

4. The construction method for hollow shear walls according to claim 3, characterized in that, The fixing ribs in the cavity at the top of the lower assembly unit include: S11. Fix the connecting parts at the top of the lower assembly unit; S12. Insert the insert rod into the cavity at the top of the lower assembly unit and fix the insert rod to the connector. The bottom of the reinforcing bar is provided with a baffle, which is located in the cavity at the top of the lower assembly unit. The baffle cooperates with the side wall of the cavity to block concrete.

5. The construction method for hollow shear walls according to claim 4, characterized in that, In S11, both ends of the connector are fixedly connected to the first connector at the top of the lower assembly unit.

6. The construction method of the hollow shear wall according to claim 4, characterized in that, In S2, during the pouring of the floor slab, the floor slab pouring mold cooperates with the lower assembly unit to form a concrete pouring cavity. The connector is connected to the reinforcing bar and the first connector, and works with the concrete to improve the connection strength between the lower assembly unit and the floor slab.

7. The construction method for hollow shear walls according to claim 4, characterized in that, In S12, after the insert is fixed to the connector, the portion protruding from the lower assembly unit is not at the same height.

8. The construction method for hollow shear walls according to claim 3, characterized in that, It also includes S4, injecting concrete into the cavity of the upper assembly unit, and after the concrete solidifies, completing the fixation of the hollow shear wall.

9. The construction method of the hollow shear wall according to claim 8, characterized in that, The step of injecting concrete into the cavity of the upper assembly unit includes: sending a delivery pipe to the bottom of the cavity and injecting concrete into the cavity through the delivery pipe.

10. The construction method of the hollow shear wall according to claim 9, characterized in that, The cavity of the upper assembly unit shall accommodate at least one of the inserts.

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