Connecting method of precast concrete wall panel and cast-in-place structure

Abstract

The invention discloses a connection method of a precast concrete wallboard and a cast-in-place structure, which comprises the following steps: S1, processing and manufacturing the precast concrete wallboard in a factory, and transporting to a construction site; s2, construction of a cast-in-place structure is completed on site, the cast-in-place structure comprises construction of a lower-layer cast-in-place concrete wallboard and a concrete floor, and the prefabricated concrete wallboard serves as an upper layer; s3, the prefabricated concrete wallboard is installed; s4, the outer edge between the prefabricated concrete wallboard and the concrete floor slab is blocked, and grouting is conducted on the connecting sleeve; and S5, the grouting material is maintained to reach the preset strength. According to the fabricated structure house, traditional operation surface procedures are converted into factory production in a unified mode, the construction difficulty of the operation surface is reduced to a great extent, the construction procedures of the operation surface are reduced, and the labor efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated buildings, and more specifically, to a method for connecting a prefabricated concrete wallboard with a cast-in-place structure. Background Art

[0002] Prefabricated buildings refer to buildings that transfer a large amount of on-site work in traditional construction methods to factories, where building components and accessories (such as floor slabs, wall panels, stairs, balconies, etc.) are processed and manufactured in the factory, transported to the construction site, and assembled and installed on site through reliable connection methods.

[0003] Among them, the steel sleeve grouting connection accounts for a small proportion of the economy in the prefabricated concrete structure, but it has a critical impact on the performance of the connection node and even the overall performance of the entire prefabricated structure. Therefore, every link in the on-site construction should be given high attention and reasonable control; in the process of steel sleeve grouting connection, the grouting is prone to bubbles and unevenness, resulting in poor treatment of the connection and the formation of small cracks in the later stage. Summary of the invention

[0004] The purpose of the present invention is to provide a method for connecting prefabricated concrete wall panels and cast-in-place structures. The conventional operation surface processes of the prefabricated structure houses are uniformly converted to factory production, which greatly reduces the construction difficulty of the operation surface, reduces the construction processes of the operation surface, and greatly improves labor efficiency.

[0005] The technical solution adopted by the present invention to solve this technical problem is: a method for connecting a prefabricated concrete wall panel with a cast-in-place structure, comprising the following steps: Step S1: Processing and manufacturing prefabricated concrete wall panels in a factory and transporting them to a construction site; Step S2, completing the construction of the cast-in-place structure on site, wherein the cast-in-place structure includes the construction of the lower cast-in-place concrete wall panels and concrete floor slabs, and the precast concrete wall panels serve as the upper layers; Step S3, precast concrete wall panel installation; wherein the precast concrete wall panel is provided with a first vertical rib, the bottom of which is inserted into a connecting sleeve; the lower layer cast-in-place concrete wall panel is provided with a second vertical rib, the upper part of which is inserted into a connecting sleeve, and the first vertical rib and the second vertical rib are provided in a one-to-one correspondence; Step S4, sealing the outer edge between the precast concrete wall panel and the concrete floor panel, and injecting grout into the connecting sleeve; Step S5, curing the grouting material to a predetermined strength.

[0006] As a further solution of the present invention, a gap is designed between the lower end of the precast concrete wall panel and the concrete floor slab in step S2, and to ensure that the upper and lower ends of the precast concrete wall panel are flush, gaskets of corresponding heights are placed at the four corners of the lower part of each precast concrete wall panel according to the measured values ​​to level the elevation and prevent the gaskets from shifting.

[0007] As a further solution of the present invention, the step S3 specifically includes: Precast concrete wall panel hoisting: When the hoisting is about 0.5m from the ground, the hoisting device is confirmed to be safe. After confirming that the hoisting device is safe, continue the hoisting operation; Prefabricated wall panels in place: When the prefabricated concrete wall panels are hoisted to the construction floor 200mm away from the floor, the installer holds the wall panels steady against the prefabricated wall panel positioning lines marked on the floor, and uses a small mirror to check whether the connection sleeve at the bottom of the wall panel is aligned with the two positions of the vertical reinforcement. After the inspection is qualified, the hook is slowly lowered to make the prefabricated concrete wall panels fall onto the gaskets and stabilize them in place; After the precast concrete wall panels are in place, two long and short diagonal supports are used to temporarily fix the precast concrete wall panels; after the precast concrete wall panels are stable, the elevation and axis are in compliance, and the diagonal supports are installed and fixed.

[0008] As a further solution of the present invention, the diagonal support is arranged at 2 / 3 of the wall, the angle between the diagonal support and the horizontal line is between 45° and 60°, and each precast concrete wall panel is provided with no less than 2 diagonal supports.

[0009] As a further solution of the present invention, during the construction in step S3, check whether the position of the second vertical reinforcement is consistent with the position of the steel bar connecting sleeve of the precast concrete wall panel; and during the construction in step S2, the second vertical reinforcement is positioned using a positioning steel plate; during the pouring of the cast-in-place structural concrete, disturbance of the second vertical reinforcement should be avoided as much as possible, and the second vertical reinforcement should be reviewed after the concrete is poured.

[0010] As a further solution of the present invention, a steel sleeve is used to check whether the position of the second vertical reinforcement is consistent with the position of the reinforcement connecting sleeve of the precast concrete wall panel through a reinforcement positioning control steel sleeve. The reinforcement positioning control steel sleeve is a steel plate structure with a plurality of holes formed thereon for the second vertical reinforcement to pass through.

[0011] As a further solution of the present invention, the second vertical reinforcement is protected from pollution before pouring concrete for the cast-in-place structure.

[0012] As a further solution of the present invention, the connecting sleeve comprises: an outer sleeve and an inner sleeve; A slurry inlet pipe is arranged at the lower part of the outer sleeve, an air outlet pipe is arranged at the upper part of the outer sleeve, and a rubber plug is used to seal the outer sleeve and the vertical ribs 1 and 2; The inner sleeve is a hollow cylindrical structure with a diameter smaller than that of the outer sleeve. The length of the inner sleeve is smaller than that of the outer sleeve. The inner sleeve is limited to the upper part of the outer sleeve by a connecting rope, and the connecting rope passes through the air outlet pipe for fixing. The outer circumference and inner circumference of the outer sleeve are both spaced apart with elastic metal sheets. Wherein, when the connecting sleeve is grouted to two-thirds of the height of the outer sleeve in step S4, the connecting rope is cut to allow the inner sleeve to fall freely.

[0013] The present invention has at least the following beneficial effects: The application adopts the combination of prefabricated concrete wall panels and cast-in-place wall panels to complete the construction of the building, which can speed up the construction progress and improve the production accuracy. The prefabricated concrete wall panel structure fully utilizes the advantages of factory production of components, realizes the standardization of prefabricated component design, factory production, transportation logistics and installation specialization, improves the construction production efficiency and reduces the generation of construction waste.

[0014] Precast concrete wall panels are connected to the cast-in-place structure using a specific connection method based on the stress characteristics of the components to meet the structural bearing capacity and deformation requirements.

[0015] Precast concrete wall panels are connected by grouting with improved connection sleeves, which can improve the overall quality of the grouting materials and meet the safety and durability of the structure.

[0016] In terms of energy conservation and emission reduction, component factory production has reduced the loss of building materials; on-site wet operations have been significantly reduced, reducing the generation of construction waste; the formwork support area has been reduced, reducing the use of wood; the on-site workload of steel bars and concrete has been reduced, reducing on-site water and electricity consumption, and also reducing the emission of pollutants such as construction noise and smoke, with significant benefits in energy conservation and emission reduction.

[0017] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the position setting of the diagonal brace of the present invention; Figure 2 It is a structural schematic diagram of the steel sleeve plate for positioning and controlling steel bars of the present invention; Figure 3 It is a structural schematic diagram of the connecting sleeve of the present invention.

[0019] Among them, 1-precast concrete wall panel, 2-oblique support, 3-hole, 4-cast-in-place concrete wall panel, 5-concrete floor slab, 6-outer sleeve, 7-inner sleeve, 8-connecting rope, 9-elastic metal sheet, 10-vertical reinforcement one, 11-vertical reinforcement two. DETAILED DESCRIPTION

[0020] The present invention is described in detail and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly pointed out that the technical solutions and technical features provided in each part of the present invention, including the following description, can be combined with each other without conflict.

[0021] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and implementations, and its specific implementation process is as follows: The present invention provides a method for connecting a precast concrete wall panel 1 with a cast-in-place structure, comprising the following steps: Step S1, processing and manufacturing the precast concrete wall panel 1 in the factory and transporting it to the construction site; before the precast concrete wall panel 1 is installed, the concrete strength of the precast concrete wall panel 1 should meet the design requirements; when there is no specific requirement in the design, the concrete cube compressive strength under the same conditions should not be less than 75% of the concrete strength grade value.

[0023] Step S2, completing the construction of the cast-in-place structure on site, wherein the cast-in-place structure includes the construction of the lower cast-in-place concrete wall panels 4 and the concrete floor slabs 5, and the precast concrete wall panels 1 are used as the upper layers; Step S3, installation of precast concrete wall panel 1; wherein, a vertical rib 10 is arranged in the precast concrete wall panel 1, and the bottom of the vertical rib 10 is inserted into the connecting sleeve; a vertical rib 2 11 is arranged in the lower cast-in-place concrete wall panel 4, and the upper part of the vertical rib 2 11 is inserted into the connecting sleeve, and the vertical rib 10 and the vertical rib 2 11 are arranged in a one-to-one correspondence; it is noted that the position of the vertical rib 10 during the installation process is not offset to ensure the installation accuracy of the precast concrete wall panel 1.

[0024] Step S4, sealing the outer edge between the precast concrete wall panel 1 and the concrete floor panel 5, and injecting grout into the connecting sleeve; Step S5, curing the grouting material to a predetermined strength.

[0025] The present technical scheme may also include the following technical details to better achieve the technical effect: in the step S2, a gap of about 20 mm (for grouting) is designed between the lower end of the precast concrete wall panel 1 and the concrete floor slab 5. At the same time, in order to ensure that the upper and lower ends of the precast concrete wall panel 1 are flush, gaskets of corresponding heights are placed at the four corners of the lower part of each precast concrete wall panel 1 according to the measured values ​​to level the elevation and prevent the gaskets from shifting; the bottom gasket should be made of steel gaskets with a thickness of 1 mm, 2 mm, 5 mm, and 10 mm.

[0026] This technical solution may also include the following technical details to better achieve the technical effect: Step S3 specifically includes: Precast concrete wall panel 1 hoisting: When the hoisting is about 0.5m from the ground, the hoisting device is confirmed to be safe. After confirming that the hoisting device is safe, continue the hoisting operation; Prefabricated wall panels in place: When the prefabricated concrete wall panel 1 is hoisted to the construction floor 200mm away from the floor, it will pause for a while. The installer will hold the wall panel steady according to the prefabricated wall panel positioning line marked on the floor, and use a small mirror to check whether the connection sleeve at the bottom of the wall panel is aligned with the position of the vertical reinforcement 11. After the inspection is qualified, the hook will be slowly lowered to make the prefabricated concrete wall panel 1 fall onto the gasket and be placed in place; After the precast concrete wall panel 1 is in place, two long and short diagonal supports are used to temporarily fix the precast wall panel. The diagonal supports are mainly used to fix and adjust the precast wall, ensure the verticality of the precast wall installation, strengthen the connection between the precast wall and the main structure, and ensure that the wall does not move during grouting and post-poured concrete pouring; after the precast concrete wall panel 1 is firmly placed, the elevation and axis are completed, and the diagonal support is installed and fixed.

[0027] This technical solution may also include the following technical details to better achieve the technical effect: Figure 1 As shown, the oblique support position 2 is set at 2 / 3 of the wall, the angle between the oblique support 2 and the horizontal line is between 45° and 60°, and each precast concrete wall panel 1 is provided with no less than 2 oblique supports.

[0028] The technical scheme may also include the following technical details to better achieve the technical effect: during the construction in step S3, check whether the position of the vertical reinforcement 11 is consistent with the position of the steel bar connecting sleeve of the precast concrete wall panel 1; and during the construction in step S2, the vertical reinforcement 11 is positioned using a positioning steel plate to ensure that the positioning steel plate has a certain rigidity, thereby ensuring that the reserved length of the vertical reinforcement 11 has a margin to avoid the vertical reinforcement 11 moving downward during vibration and causing insufficient length to be inserted into the connecting sleeve. During on-site construction, the length of the vertical reinforcement 11 can be increased by 5 to 10 mm relative to the design length; during the pouring of the cast-in-place structural concrete, the disturbance of the vertical reinforcement 11 should be avoided as much as possible, and the vertical reinforcement 11 should be reviewed after the concrete is poured.

[0029] This technical solution may also include the following technical details to better achieve the technical effect: Figure 2 As shown, the steel sleeve plate is used to check whether the position of the vertical reinforcement 11 is consistent with the position of the reinforcement connection sleeve of the precast concrete wall panel 1. The steel sleeve plate is a steel plate structure with a plurality of holes 3 for the vertical reinforcement 11 to pass through. Check whether the position, verticality and reserved length of the reserved reinforcement are accurate, correct the reinforcement that does not meet the requirements, and adjust the deviation in time to ensure that the sleeve in the upper precast wall and the reserved dowel of the next layer can be smoothly aligned.

[0030] This technical solution can also include the following technical details to better achieve the technical effect: before pouring concrete for the cast-in-place structure, the vertical reinforcement 11 is protected from pollution, and PVC pipes can be used for protection to avoid affecting the connection performance of the reinforcement.

[0031] This technical solution may also include the following technical details to better achieve the technical effect: Figure 3 As shown, the connecting sleeve comprises: an outer sleeve 6 and an inner sleeve 7; The outer sleeve 6 is provided with a slurry inlet pipe at the lower part, and an air outlet pipe is provided at the upper part of the outer sleeve 6. The outer sleeve 6 and the vertical rib 10 and the vertical rib 2 11 are sealed by rubber plugs. The inner sleeve 7 is a hollow cylindrical structure with a diameter smaller than that of the outer sleeve 6. In one embodiment, the diameter of the inner sleeve 7 is half of the diameter of the outer sleeve 6. The length of the inner sleeve 7 is smaller than the length of the outer sleeve 6. In one embodiment, the length of the inner sleeve 7 is one tenth of the length of the outer sleeve 6. The inner sleeve 7 is limited to the upper part of the outer sleeve 6 by a connecting rope 8, and the connecting rope 8 passes through the air outlet pipe for fixing; the outer circumference and inner circumference of the outer sleeve 6 are both spaced apart with elastic metal sheets 9; Among them, when the connecting sleeve is grouted to about two-thirds of the height of the outer sleeve 6 in step S4, the connecting rope 8 is cut to allow the inner sleeve 7 to fall freely, which has a disturbing effect on the grouting material, can cause the bubbles in the grouting material to burst, and cause the bubbles to be quickly discharged from the grouting material, thereby avoiding the problem of poor quality of the grouting material and easy cracking due to the inability to vibrate the grouting at the connecting sleeve.

[0032] The grouting material in the connecting sleeve should be cement-based grouting material. The physical and mechanical properties of the grouting material should meet the requirements of Table 1 below and should also meet the requirements of the current relevant national standards.

[0033] Table 1 Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A method for connecting a precast concrete wall panel to a cast-in-place structure, characterized in that: The following steps are involved: Step S1: Processing and manufacturing prefabricated concrete wall panels in a factory and transporting them to a construction site; Step S2, completing the construction of the cast-in-place structure on site, wherein the cast-in-place structure includes the construction of the lower cast-in-place concrete wall panels and concrete floor slabs, and the precast concrete wall panels serve as the upper layers; Step S3, precast concrete wall panel installation; wherein the precast concrete wall panel is provided with a first vertical rib, the bottom of which is inserted into a connecting sleeve; the lower layer cast-in-place concrete wall panel is provided with a second vertical rib, the upper part of which is inserted into a connecting sleeve, and the first vertical rib and the second vertical rib are provided in a one-to-one correspondence; Step S4, sealing the outer edge between the precast concrete wall panel and the concrete floor panel, and injecting grout into the connecting sleeve; Step S5, curing the grouting material to a predetermined strength.

2. The method for connecting a precast concrete wall panel to a cast-in-place structure according to claim 1, characterized in that: In step S2, a gap is designed between the lower end of the precast concrete wall panel and the concrete floor slab. At the same time, to ensure that the upper and lower ends of the precast concrete wall panel are flush, gaskets of corresponding heights are placed at the four corners of the lower part of each precast concrete wall panel according to the measured values ​​to level the elevation and prevent the gaskets from shifting.

3. The method for connecting a precast concrete wall panel to a cast-in-place structure according to claim 2, characterized in that: The step S3 specifically includes: Precast concrete wall panel hoisting: When the hoisting is about 0.5m from the ground, the hoisting device is confirmed to be safe. After confirming that the hoisting device is safe, continue the hoisting operation; Prefabricated wall panels in place: When the prefabricated concrete wall panels are hoisted to the construction floor 200mm away from the floor, the installer holds the wall panels steady against the prefabricated wall panel positioning lines marked on the floor, and uses a small mirror to check whether the connection sleeve at the bottom of the wall panel is aligned with the two positions of the vertical reinforcement. After the inspection is qualified, the hook is slowly lowered to make the prefabricated concrete wall panels fall onto the gaskets and stabilize them in place; After the precast concrete wall panels are in place, two long and short diagonal supports are used to temporarily fix the precast concrete wall panels; after the precast concrete wall panels are stable, the elevation and axis are in compliance, and the diagonal supports are installed and fixed.

4. The method for connecting a precast concrete wall panel to a cast-in-place structure according to claim 3, characterized in that: The oblique support position is set at 2 / 3 of the wall, the angle between the oblique support and the horizontal line is between 45° and 60°, and each precast concrete wall panel is equipped with no less than 2 oblique supports.

5. The method for connecting a precast concrete wall panel to a cast-in-place structure according to claim 1, characterized in that: During the construction in step S3, check whether the position of the second vertical reinforcement is consistent with the position of the steel bar connection sleeve of the precast concrete wall panel; and during the construction in step S2, the second vertical reinforcement is positioned using a positioning steel plate; during the pouring of the cast-in-place structural concrete, disturbance of the second vertical reinforcement should be avoided as much as possible, and the second vertical reinforcement should be reviewed after the concrete is poured.

6. The method for connecting a precast concrete wall panel to a cast-in-place structure according to claim 1, characterized in that: The steel bar positioning control steel sleeve is used to check whether the position of the second vertical bar is consistent with the position of the steel bar connecting sleeve of the precast concrete wall panel. The steel bar positioning control steel sleeve is a steel plate structure with a plurality of holes opened thereon for the second vertical bar to pass through.

7. The method for connecting a precast concrete wall panel to a cast-in-place structure according to claim 1, characterized in that: Before pouring concrete for cast-in-place structures, the vertical reinforcement shall be protected from pollution.

8. The method for connecting a precast concrete wall panel to a cast-in-place structure according to claim 3, characterized in that: The connecting sleeve comprises: an outer sleeve and an inner sleeve; A slurry inlet pipe is arranged at the lower part of the outer sleeve, an air outlet pipe is arranged at the upper part of the outer sleeve, and a rubber plug is used to seal the outer sleeve and the vertical ribs 1 and 2; The inner sleeve is a hollow cylindrical structure with a diameter smaller than that of the outer sleeve. The length of the inner sleeve is smaller than that of the outer sleeve. The inner sleeve is limited to the upper part of the outer sleeve by a connecting rope, and the connecting rope passes through the air outlet pipe for fixing. The outer circumference and inner circumference of the outer sleeve are both spaced apart with elastic metal sheets. Wherein, when the connecting sleeve is grouted to two-thirds of the height of the outer sleeve in step S4, the connecting rope is cut to allow the inner sleeve to fall freely.

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