A composite prefabricated component with shear-resistant groove groups and a manufacturing method thereof

Abstract

A composite prefabricated component with a shear-resistant tooth groove group, the composite prefabricated component has an axial cavity, and a new and old concrete bonding surface is formed between the inner wall of the cavity and the post-cast concrete of the cavity. The characteristic is that a series of tooth grooves are arranged on the inner wall of the cavity to form a shear-resistant tooth groove group to enhance the shear resistance of the new and old concrete bonding surface. During the prefabrication of the composite prefabricated component, a core mold is arranged inside, and a tooth groove forming mold is arranged close to the outer wall of the core mold. The concrete of the composite prefabricated component is poured. After the concrete is cured to a certain strength, the core mold is removed to form a cavity, and a series of tooth grooves are formed on the inner wall of the cavity. The present invention can solve the problem that the inner wall of the composite prefabricated component cannot form a rough surface or keyway when the core is pulled out to form a cavity. A series of tooth grooves perpendicular to the longitudinal reinforcement direction are directly formed by the mold to ensure the overlap force transmission effect of the longitudinal reinforcement of the composite prefabricated component. There are no disadvantages such as high cost of traditional water-washed rough surfaces and difficulty in wastewater treatment, and the hidden danger of decreased interface shear resistance caused by shrinkage of post-cast concrete can be eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of construction, relates to a composite prefabricated component, and in particular to a composite prefabricated component with a shear-resistant tooth groove group and a manufacturing method thereof. Background Art

[0002] The composite prefabricated concrete structure system has been widely used at present. Its vertical components adopt composite prefabricated components such as prefabricated walls or prefabricated columns with cavities. The longitudinal reinforcement of prefabricated walls or prefabricated columns is connected by indirect lap joints. The processing and installation precision requirements are low, which can effectively reduce the longitudinal reinforcement connection cost. The connection quality is controllable. It is a type of prefabricated concrete structure system that conforms to the current national conditions in China. Representative technical systems include double-sided composite shear walls, EVE prefabricated hollow wall panels, SPCS steel welded mesh composite shear walls and longitudinal rib composite shear walls.

[0003] The roughness of the inner wall of a composite prefabricated wall or prefabricated column directly affects the shear resistance of the interface between the prefabricated concrete and the new and old concrete, and further affects the indirect lap force transmission effect and structural safety of the longitudinal reinforcement in the composite prefabricated wall or prefabricated column and the longitudinal reinforcement in the cavity. In actual projects, in order to improve production efficiency and reduce the production cost of prefabricated components, composite prefabricated walls or prefabricated columns often use core mold core pulling or mold position taking to form the internal cavity. Due to production process limitations, it is impossible to form a rough surface on the inner wall of the composite prefabricated wall or prefabricated column. In order to improve the roughness of the inner wall of the composite prefabricated wall or prefabricated column, in actual production, a retarder is often applied to the surface of the cavity core mold, and a high-pressure water is used to wash the inner wall after the core mold is pulled out to form a water-washed rough surface. The production of a water-washed rough surface often requires the setting of a special water-washing station, which affects the production layout of prefabricated components, and the wastewater is easy to cause environmental pollution, difficult to handle, and has low processing efficiency. In addition, precast concrete and cavity post-cast concrete are not poured at the same time. The shrinkage of cavity post-cast concrete can easily cause cracking of the interface between new and old concrete. The shear resistance of the washed rough surface is greatly affected by the shrinkage and cracking of the interface between new and old concrete. Summary of the invention

[0004] In order to overcome the shortcomings of the existing composite prefabricated component longitudinal reinforcement overlap section new and old concrete interface, the purpose of the present invention is to provide a composite prefabricated component with a shear-resistant tooth groove group and a manufacturing method, and set a series of tooth grooves perpendicular to the longitudinal reinforcement direction on the inner wall of the composite prefabricated component longitudinal reinforcement overlap section to form a shear-resistant tooth groove group, so as to enhance the shear resistance of the new and old concrete interface of the longitudinal reinforcement overlap section. Compared with the core-pulling forming surface or water-washed rough surface currently used in the composite prefabricated component new and old concrete interface, the present invention can solve the problem that the inner wall cannot form a rough surface or keyway when the composite prefabricated component core is pulled to form a cavity, and directly form a series of tooth grooves perpendicular to the longitudinal reinforcement direction through the mold to ensure the longitudinal reinforcement overlap force transmission effect of the composite prefabricated component, without the shortcomings of the traditional water-washed rough surface such as high cost and difficult wastewater treatment, and can eliminate the hidden danger of reduced interface shear resistance caused by shrinkage of post-cast concrete.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A composite prefabricated component with a shear-resistant tooth groove group, the composite prefabricated component 1 has an axial cavity 2, and a new-old concrete bonding surface 13 is formed between the inner wall of the cavity 2 and the post-cast concrete of the cavity 2. It is characterized in that a series of tooth grooves 41 are arranged on the inner wall of the cavity 2 to form a shear-resistant tooth groove group to enhance the shear resistance of the new-old concrete bonding surface 13.

[0007] Furthermore, the tooth grooves 41 are only arranged within the longitudinal reinforcement overlap section 22 of the longitudinal reinforcement 11 in the composite prefabricated component and the longitudinal reinforcement 21 in the cavity, and are continuously or discontinuously arranged along the inner wall of the cavity 2 perpendicular to the direction of the longitudinal reinforcement 11 in the composite prefabricated component, so as to ensure the indirect overlap force transmission effect of the longitudinal reinforcement 11 in the composite prefabricated component and the longitudinal reinforcement 21 in the cavity.

[0008] Furthermore, the inclined surface angle of the tooth groove 41 is not greater than 30°, the depth is not less than 3 mm, and the width is between 10 and 100 mm.

[0009] The present invention also provides a method for manufacturing the composite prefabricated component with the shear-resistant tooth groove group. When the composite prefabricated component 1 is prefabricated, a core mold 3 is arranged inside, and a tooth groove forming mold is arranged close to the outer wall of the core mold 3. Concrete of the composite prefabricated component 1 is poured. After the concrete is cured to a certain strength, the core mold 3 is removed to form a cavity 2, and a series of tooth grooves 41 are formed on the inner wall of the cavity 2.

[0010] Furthermore, the tooth groove forming mold is retained in the composite prefabricated component 1 or removed according to the material of the tooth groove forming mold.

[0011] Furthermore, the tooth groove forming mold is made by plastic injection molding, and after the processing of the composite prefabricated component 1 is completed, it is removed or retained inside the composite prefabricated component 1 according to the stress performance requirements; or, the tooth groove forming mold is made by stamping of thin-walled metal plate, and after the processing of the composite prefabricated component 1 is completed, it is retained in the composite prefabricated component 1.

[0012] Furthermore, the tooth groove forming mold adopts an integral tooth groove forming mold 4 whose contour shape is consistent with the outer contour of the core mold 3, or adopts a single-piece tooth groove forming mold 5, wherein the single-piece tooth groove forming mold 5 is arranged on one or more sides of the outer wall of the core mold 3.

[0013] Furthermore, the tooth grooves 41 on the integral tooth groove forming mold 4 or the single-piece tooth groove forming mold 5 are arranged continuously or discontinuously along a direction perpendicular to the longitudinal reinforcement 11 in the composite prefabricated component.

[0014] Furthermore, the integral tooth groove forming mold 4 is made of plastic injection molding and when the composite prefabricated component 1 needs to be dismantled after processing, a plurality of breakpoint strips 42 need to be provided along the integral tooth groove forming mold 4 to facilitate dismantling.

[0015] The present invention can also be extended to other similar structures. For example, the present invention also provides a prefabricated shear wall with a shear-resistant tooth groove group. The single-piece tooth groove forming mold 5 is pasted on the side mold of the prefabricated shear wall. When the prefabricated shear wall is produced, a shear-resistant tooth groove group composed of a series of tooth grooves 41 is formed on its side, which enhances the shear resistance when the prefabricated shear wall is connected to the post-cast vertical joint.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) It can solve the problem that the inner wall of the composite precast component cannot form a rough surface or keyway when the core is pulled out to form a cavity, greatly improve the shear resistance of the new and old concrete bonding surfaces on the inner wall of the composite precast component cavity, and ensure the indirect lap force transmission effect of the longitudinal reinforcement of the composite precast component.

[0018] (2) It avoids the shortcomings of the existing prefabricated composite component cavity inner wall water-washing rough surface, such as high cost and difficult wastewater treatment, and the shear resistance of the shear-resistant tooth groove group is significantly better than that of the water-washed rough surface.

[0019] (3) The core-pulled forming surface or the water-washed rough surface of the existing composite prefabricated components has a small degree of convexity and concavity. The shear resistance of the new and old concrete interface formed will be significantly weakened after the post-cast concrete shrinks. The convexity and concavity depth of the shear-resistant tooth groove group is large. The shear resistance of the new and old concrete interface formed is basically not affected by the shrinkage of the post-cast concrete.

[0020] (4) The width of the shear groove group is large, and the coarse aggregate of concrete can enter the groove range. During shear resistance work, the coarse aggregate on both sides of the new and old concrete interface bites each other, and the shear resistance of the interface is strong.

[0021] (5) The tooth groove forming mold has low cost and can be used as a disposable product without affecting the production process and procedures of the composite prefabricated components. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the indirect overlap connection of longitudinal reinforcements of the composite prefabricated components of the present invention.

[0023] Figure 2 for Figure 1 Schematic diagram of the AA section.

[0024] Figure 3 for Figure 1 The figure shows a schematic diagram of the hole-forming process during the prefabrication production of prefabricated composite components.

[0025] Figure 4 To adopt Figure 3 Schematic diagram of the indirect lap joint of the longitudinal reinforcement of prefabricated composite components processed by the process, in which the interface between the new and old concrete is a core-pulled surface or a water-washed rough surface.

[0026] Figure 5 Schematic diagram of indirect lap connection of longitudinal reinforcement when setting shear groove groups at the interface between new and old concrete of precast composite components.

[0027] Figure 6 for Figure 5 Partial structural diagram of the shear groove group at the interface between the new and old concrete.

[0028] Figure 7 A three-dimensional schematic diagram of an integral tooth groove forming die for making shear-resistant tooth groove groups.

[0029] Figure 8 A three-dimensional schematic diagram of a one-piece tooth groove forming die for making shear-resistant tooth groove groups.

[0030] Fig. 9 It is a three-dimensional schematic diagram of an integral tooth groove forming mold for plastic injection molding, in which breakpoint strips are set at the corners.

[0031] In the figure: 1-composite precast component; 11-longitudinal reinforcement in the composite precast component; 12-hoops; 13-new and old concrete interface; 2-cavity; 21-longitudinal reinforcement in the cavity; 22-longitudinal reinforcement overlap section; 3-core mold; 4-integral tooth groove forming mold; 41-tooth groove; 42-breakpoint belt; 5-single-piece tooth groove forming mold. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below with reference to the accompanying drawings and examples.

[0033] like Figures 1 to 9 As shown, the present invention is a composite prefabricated component with a shear-resistant tooth groove group, the composite prefabricated component 1 is pre-reserved with an axial cavity 2, after the post-cast concrete in the cavity 2 is poured at the construction site, a new and old concrete bonding surface 13 is formed between the inner wall of the cavity 2 and the post-cast concrete in the cavity 2, and a series of tooth grooves 41 are arranged on the inner wall of the cavity 2 to form a shear-resistant tooth groove group to enhance the shear resistance of the new and old concrete bonding surface 13. The present invention can solve the problem that the inner wall cannot form a rough surface or keyway when the composite prefabricated component is cored to form a cavity, and a series of tooth grooves perpendicular to the longitudinal reinforcement direction are directly formed by the mold to ensure the longitudinal reinforcement overlap force transmission effect of the composite prefabricated component, without the disadvantages of high cost of traditional water-washed rough surface and difficulty in wastewater treatment, and can eliminate the hidden danger of decreased interface shear resistance caused by shrinkage of post-cast concrete.

[0034] In a preferred embodiment of the present invention, the shear-resistant tooth groove group is used for the overlapping section of the longitudinal reinforcement 11 in the composite precast component and the longitudinal reinforcement 21 in the cavity, that is, the tooth groove 41 is only arranged in the longitudinal reinforcement overlapping section 22 of the longitudinal reinforcement 11 in the composite precast component and the longitudinal reinforcement 21 in the cavity, so as to enhance the shear resistance of the new and old concrete interface 13 between the inner wall of the cavity 2 of the composite precast component and the post-cast concrete of the cavity 2, avoid shear failure of the new and old concrete interface 13 under the interface shear force caused by the indirect overlapping force transmission between the longitudinal reinforcement 11 in the composite precast component and the longitudinal reinforcement 21 in the cavity, realize the effective transmission of tensile and compressive stresses between the longitudinal reinforcement 11 in the composite precast component and the longitudinal reinforcement 21 in the cavity, and ensure the force performance and structural safety of the composite precast component 1.

[0035] like Figure 1 , Figure 2 As shown, during on-site construction, the cavity longitudinal reinforcement 21 is arranged in the cavity 2, and after the post-poured concrete in the cavity 2 is poured, the indirect overlap connection between the longitudinal reinforcement 11 in the composite prefabricated component and the longitudinal reinforcement 21 in the cavity is completed, and the transmission of tensile and compressive stresses between the longitudinal reinforcement 11 in the composite prefabricated component and the longitudinal reinforcement 21 in the cavity is achieved through the bonding effect between the longitudinal reinforcement 11 in the composite prefabricated component, the longitudinal reinforcement 21 in the cavity and the surrounding concrete, thereby ensuring the continuity of the upper and lower composite prefabricated components 1 in the building structure.

[0036] like Figure 3 As shown, in order to improve production efficiency and reduce the production cost of prefabricated components, a core mold 3 can be used to occupy the position during the prefabrication of the composite prefabricated component 1. After the concrete of the composite prefabricated component 1 reaches a certain strength, the core mold 3 is extracted or removed by special equipment to form a cavity 2 in the composite prefabricated component 1.

[0037] like Figure 4 As shown, the inner wall of the cavity 2 of the existing composite prefabricated component 1 is mostly not treated after the core mold 3 is pulled out, or a water-washed rough surface is formed on the inner wall by high-pressure water washing. The new and old concrete bonding surface 13 within the longitudinal reinforcement lap section 22 is a core-pulling molding surface or a water-washed rough surface. The shear resistance of the new and old concrete bonding surface 13 is greatly affected by the shrinkage of the post-cast concrete in the cavity 2 and the quality of the inner wall treatment of the cavity 2.

[0038] like Figure 5 , Figure 6 As shown, the present invention sets a series of tooth grooves 41 within the range of the longitudinal reinforcement overlap section 22 of the inner wall of the cavity 2. After pouring the post-cast concrete in the cavity 2, a shear-resistant tooth groove group is formed at the interface 13 between the new and old concrete. The excellent shear resistance of the shear-resistant tooth groove group is used to ensure the transmission of tensile and compressive stresses between the longitudinal reinforcement 11 in the prefabricated component and the longitudinal reinforcement 21 in the cavity.

[0039] Specifically, the tooth grooves 41 only need to be arranged within the longitudinal reinforcement overlap section 22, and the tooth grooves 41 are arranged continuously or discontinuously along the inner wall of the cavity 2 perpendicular to the direction of the longitudinal reinforcement 11 in the composite prefabricated component; the inclined surface angle of the tooth grooves 41 is not greater than 30°, the depth is not less than 3mm, and the width is between 10 and 100mm.

[0040] The specific method of making the tooth groove 41 is as follows: when the prefabricated component 1 is prefabricated, the tooth groove 41 is closely attached to the prefabricated component 1. Figure 3 A tooth groove forming mold is arranged on the outer wall of the core mold 3, and concrete of the composite prefabricated component 1 is poured. After the concrete is cured to a certain strength, the core mold 3 is removed to form a cavity 2. At the same time, a series of tooth grooves 41 are formed on the joint surface 13 of the new and old concrete. The tooth groove forming mold is retained on the inner wall of the cavity 2 or removed according to the material of the tooth groove forming mold.

[0041] For example, the tooth groove forming mold can be made by plastic injection molding. After the processing of the composite prefabricated component 1 is completed, the plastic tooth groove forming mold can be removed or retained on the inner wall of the cavity 2 according to the stress performance requirements; the tooth groove forming mold can also be made by stamping of thin-walled metal plates, and the metal tooth groove forming mold can be retained on the inner wall of the cavity 2 without removal.

[0042] like Figure 7 As shown, the tooth groove forming mold can be an integral tooth groove forming mold 4 with a contour shape consistent with the outer contour of the core mold 3. When the composite prefabricated component 1 is prefabricated, it is only necessary to set the integral tooth groove forming mold 4 on the Figure 3 On the core mold 3.

[0043] like Figure 8 As shown, the tooth groove forming mold can also be designed as a single-piece tooth groove forming mold 5, and the single-piece tooth groove forming mold 5 can be arranged in Figure 3 One or more sides of the outer wall of the core mold 3 form tooth grooves 41 on one or more sides of the corresponding cavity 2 .

[0044] In the present invention, the shape of the tooth groove 41 on the integral tooth groove forming mold 4 or the single-piece tooth groove forming mold 5 is similar to Figure 5 , Figure 6 The tooth grooves 41 on the inner wall of the cavity 2 of the middle overlapping prefabricated component 1 are the same and are arranged continuously or discontinuously along the length direction perpendicular to the integral tooth groove forming mold 4 or the single-piece tooth groove forming mold 5 .

[0045] In particular, if Fig. 9 As shown, the integral tooth groove forming mold 4 is made of plastic injection molding and when the laminated prefabricated component 1 needs to be dismantled after processing, a plurality of breakpoint strips 42 are arranged along the integral tooth groove forming mold 4 to facilitate dismantling.

[0046] The present invention can also be extended to other similar structures. For example, the present invention also provides a prefabricated shear wall with a shear-resistant tooth groove group. The single-piece tooth groove forming mold 5 is pasted on the side mold of the prefabricated shear wall. When the prefabricated shear wall is produced, a shear-resistant tooth groove group composed of a series of tooth grooves 41 is formed on its side, which enhances the shear resistance when the prefabricated shear wall is connected to the post-cast vertical joint.

[0047] In summary, the present invention can solve the problem that a rough surface or keyway cannot be formed on the inner wall when a cavity is formed by core pulling of a composite prefabricated component. A series of tooth grooves perpendicular to the longitudinal reinforcement direction are directly formed by a mold to ensure the overlap force transmission effect of the longitudinal reinforcement of the composite prefabricated component. The present invention does not have the disadvantages of high cost and difficulty in wastewater treatment of traditional water-washed rough surfaces. The shear-resistant tooth groove group of the present invention has strong shear resistance, which can eliminate the hidden danger of decreased interface shear resistance caused by shrinkage of post-cast concrete.

[0048] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes and substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for manufacturing a composite prefabricated component with a shear-resistant tooth groove group, which is used to manufacture a composite prefabricated component with a shear-resistant tooth groove group, wherein the composite prefabricated component (1) has an axial cavity (2), and a new and old concrete bonding surface (13) is formed between the inner wall of the cavity (2) and the post-cast concrete of the cavity (2), and a series of tooth grooves (41) are arranged on the inner wall of the cavity (2) to form a shear-resistant tooth groove group to enhance the shear resistance of the new and old concrete bonding surface (13), wherein the tooth grooves (41) are only arranged within the longitudinal reinforcement overlap section (22) of the composite prefabricated component inner longitudinal reinforcement (11) and the longitudinal reinforcement (21) in the cavity, and are continuously or discontinuously arranged along the inner wall of the cavity (2) perpendicular to the direction of the longitudinal reinforcement (11) in the composite prefabricated component, so as to ensure the indirect overlap force transmission effect of the longitudinal reinforcement (11) in the composite prefabricated component and the longitudinal reinforcement (21) in the cavity, and characterized in that: During the prefabrication of the composite prefabricated component (1), a core mold (3) is arranged inside, a tooth groove forming mold is arranged close to the outer wall of the core mold (3), and concrete of the composite prefabricated component (1) is poured. After the concrete is cured to a certain strength, the core mold (3) is removed to form a cavity (2), and a series of tooth grooves (41) are formed on the inner wall of the cavity (2); The tooth groove forming mold is made by plastic injection molding, and after the processing of the composite prefabricated component (1) is completed, it is removed or retained in the composite prefabricated component (1) according to the requirements of the stress performance; or, the tooth groove forming mold is made by stamping a thin-walled metal plate, and after the processing of the composite prefabricated component (1) is completed, it is retained in the composite prefabricated component (1); The tooth groove forming mold adopts an integral tooth groove forming mold (4) whose contour shape is consistent with the outer contour of the core mold (3), or adopts a single-piece tooth groove forming mold (5), wherein the single-piece tooth groove forming mold (5) is arranged on one or more sides of the outer wall of the core mold (3).

2. The method for manufacturing a composite prefabricated component with a shear-resistant groove group according to claim 1, characterized in that: The tooth groove forming mold is retained in the composite prefabricated component (1) or removed according to the material of the tooth groove forming mold.

3. The method for manufacturing a composite prefabricated component with a shear-resistant groove group according to claim 1, characterized in that: The tooth grooves (41) on the integral tooth groove forming mold (4) or the single-piece tooth groove forming mold (5) are arranged continuously or discontinuously in a direction perpendicular to the longitudinal reinforcement (11) in the laminated prefabricated component.

4. The method for manufacturing a composite prefabricated component with a shear-resistant groove group according to claim 1, characterized in that: The integral tooth groove forming mold (4) is made by plastic injection molding and when the laminated prefabricated component (1) needs to be dismantled after processing, a plurality of breakpoint strips (42) need to be provided along the integral tooth groove forming mold (4) to facilitate dismantling.

5. The method for manufacturing a composite prefabricated component with a shear-resistant groove group according to claim 1, characterized in that: The tooth groove (41) has an inclined surface angle of no more than 30°, a depth of no less than 3 mm, and a width of between 10 and 100 mm.

6. A prefabricated shear wall manufactured by the method for manufacturing a composite prefabricated component with a shear-resistant groove group according to claim 1, characterized in that: The single-piece tooth groove forming mold (5) is pasted to the side mold of the prefabricated shear wall. When the prefabricated shear wall is produced, a shear-resistant tooth groove group consisting of a series of tooth grooves (41) is formed on the side of the prefabricated shear wall, so as to enhance the shear resistance when the prefabricated shear wall is connected with the post-cast vertical joint.

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