Prefabricated wall connecting joint adopting inverted sleeve grouting and local cast-in-place combination

Abstract

The utility model discloses a prefabricated wall body connecting joint adopting inverted sleeve grouting and local cast-in-place combination, which comprises two prefabricated wall bodies which are arranged in an overlapped manner, the prefabricated wall bodies are inverted T-shaped, inverted full-grouting sleeves are arranged at the tops of the prefabricated wall bodies, and vertically distributed reinforcing steel bars and horizontally distributed reinforcing steel bars are arranged in the prefabricated wall bodies; the vertically-distributed steel bars extend out of the two sides of the top and the bottom of the prefabricated wall body and are provided with hooks, and after overlapping, the adjacent extending sections are connected to form lap joint sections and cast-in-place ultra-high performance concrete is cast in place to form cast-in-place sections. One end of the vertically-distributed steel bar located in the middle of the prefabricated wall is connected with the full-grouting sleeve, and the other end of the vertically-distributed steel bar extends out of the bottom of the prefabricated wall and is used for being inserted into the full-grouting sleeve located in the prefabricated wall on the lower side and being in grouting connection; a floor slab and a bed mortar layer are further arranged between every two adjacent wall bodies. The operation difficulty is greatly reduced, the assembly quality is guaranteed, and the inspection is convenient and reliable.

Description

Technical Field

[0001] The utility model relates to the field of prefabricated buildings, and particularly relates to a precast wall connection node adopting a combination of inverted sleeve grouting and partial in-situ casting. Background Technique

[0002] A precast concrete structure refers to a concrete structure in which components are prefabricated in a factory and transported to a construction site for assembly and installation. As a structural form conforming to industrial development, the precast concrete structure has the characteristics of high efficiency in emission reduction, green and low-carbon, high component quality, and labor reduction. In order to comprehensively implement a resource-saving and environment-friendly society and establish a survival mode of harmonious coexistence between humans and nature, prefabricated buildings have been gradually developed in China and become the mainstream direction of the development of the construction industry.

[0003] There are many types of connection methods for precast concrete structures. Specifically, there are mainly sleeve grouting connection of steel bars, overlapping connection of steel bars, post-cast concrete connection, bolt connection, welding, etc. Among them, the sleeve grouting connection of steel bars is a connection method with relatively high safety factor and the most reliable connection in the connection of components in precast concrete structures. It has been rapidly developed and applied due to improving the deficiencies of connection methods such as welding and bolt connection. Therefore, most of the existing precast walls adopt the sleeve grouting connection method.

[0004] The interior wall node of a precast building generally includes a lower wall, an upper wall, and a floor slab layer located between the lower wall and the upper wall. The part of the floor slab layer located between the lower wall and the upper wall is the in-situ casting part, which is cast on-site after the upper wall is installed. This is mainly to avoid the vertical steel bars protruding from the top of the lower wall. The vertical steel bars of the lower wall extend into the steel bar sleeves at the bottom of the upper wall, and the connection is completed through grouting construction.

[0005] In the construction process of the above structure, the following main problems exist:

[0006] 1. The operation of aligning the steel bar sleeve with the vertical steel bar is difficult in construction, resulting in a long hoisting construction time;

[0007] 2. The sleeve grouting connection has high technical requirements for workers. Moreover, since the steel bar sleeves for connecting steel bars are inside the components, it is difficult to inspect the quality, and it is difficult to ensure the grouting quality. When situations such as insufficient strength of the grouting material and insufficient steel bar anchorage length occur, if not properly handled, it will affect the overall performance of the structure and have an adverse impact on the structural safety;

[0008] 3. When constructing traditional precast walls, they are suspended in the air and external supports are required, which is inconvenient for construction;

[0009] 4. There are many on-site wet operations, which have a greater impact on the environment. Moreover, a large amount of human resources are required for operation and maintenance during construction, resulting in relatively high costs for wet operations.

[0010] 5. Under seismic action, the edge members (hidden columns) of traditional precast assembled walls are the parts with large forces, while the middle part of the wall has relatively small forces. During the loading process of seismic tests, relatively large damage often occurs at the bottom of the edge members (hidden columns). There is a lack of strengthening for this part in the existing structure.

[0011] Therefore, there is an urgent need to develop a new type of connection node for precast concrete interior walls. Summary of the Invention

[0012] The technical problem to be solved by the present utility model is to provide a connection node for precast walls that combines inverted sleeve grouting and partial in-situ casting, greatly reducing the operation difficulty, ensuring the construction quality, and being convenient and reliable for inspection.

[0013] To solve the above technical problems, the present utility model provides a connection node for precast walls that combines inverted sleeve grouting and partial in-situ casting, including two overlapping precast walls. The precast walls are in an inverted convex shape. Vertical distribution steel bars and horizontal distribution steel bars are arranged in the precast walls. The vertical distribution steel bars include sleeve connection steel bars arranged at the convex parts of the precast walls and cast-in-place connection steel bars arranged on both sides of the convex parts of the precast walls. The top of the sleeve connection steel bars is connected to an inverted full-grouting sleeve, and the bottom extends out of the convex part to form lower inserted steel bars. The full-grouting sleeve partially extends out of the top surface of the precast wall; both ends of the cast-in-place connection steel bars extend out of the top surface and the bottom surface of the precast wall respectively to form upper extended-end steel bars and lower extended-end steel bars, and hooks are arranged at the ends of the upper extended-end steel bars and the lower extended-end steel bars.

[0014] A floor slab and a grouting bedding layer are arranged at the top of the lower precast wall. The convex part of the upper precast wall abuts against the grouting bedding layer, and the lower inserted steel bars extend into the full-grouting sleeve of the lower precast wall and are connected by grouting.

[0015] The upper extended-end steel bars of the lower precast wall and the lower extended-end steel bars of the upper precast wall are fixed by tying with wire to form a lap joint section. A plurality of horizontal cast-in-place area steel bars and stirrups are arranged in the lap joint section, and a cast-in-place area is formed by casting with ultra-high performance concrete.

[0016] Further, the extended lengths of the upper extended-end steel bars and the lower extended-end steel bars are at least 20 times D, where D is the diameter of the vertical distribution steel bars.

[0017] Further, the sleeve connection steel bars and the full-grouting sleeves are arranged in a plum blossom shape.

[0018] Furthermore, the protruding length of the full grouting sleeve is the sum of the thicknesses of the floor slab and the grout bedding layer.

[0019] Furthermore, the protruding length of the lower inserted steel bar is greater than or equal to 8 times of D, where D is the diameter of the lower inserted steel bar.

[0020] Furthermore, the protruding length of the lower inserted steel bar is the sum of the design anchorage length and the reserved adjustment length of the steel bar.

[0021] Furthermore, the reserved adjustment length of the steel bar is 5 - 15 mm.

[0022] Furthermore, the top of the sleeve-connected steel bar and the inverted full grouting sleeve are grouted and connected during the precast component production stage.

[0023] Furthermore, no grouting ports and slurry outlet ports are provided on the outer wall of the full grouting sleeve or the grouting ports and slurry outlet ports are blocked.

[0024] The beneficial effects of the present utility model are as follows:

[0025] 1. The precast shear wall is set in an inverted convex shape, so that it can be directly hoisted into place during construction without the use of suspension and additional supports, greatly reducing the hoisting difficulty.

[0026] 2. The force-bearing characteristics of the wall are fully considered. Ultra-high performance concrete cast-in-place areas are provided on both sides at the bottom of the precast shear wall (the bottom of the edge member), strengthening the bearing capacity at the bottom of the edge member (hidden column), delaying the appearance of damage, and improving the structural force-bearing performance.

[0027] 3. Because of the connection method using the inverted full grouting sleeve, on the one hand, the traditional grouting holes and slurry outlet holes are cancelled. Before the assembly of the upper and lower precast concrete walls, grouting is directly carried out through the upper opening of the grouting sleeve by the method of "inverted grouting", changing the traditional grouting method. Whether the slurry is filled can be seen with the naked eye. After the grouting is completed, the upper and lower walls are assembled, and the connecting steel bar is inserted into the sleeve. It will not be the case that the sleeve is not filled as in the traditional sleeve grouting due to reasons such as not maintaining pressure for a period of time before the end of high-pressure grouting and not timely blocking the grouting port. On the other hand, since the bottom joint uses the mortar laying method to lay the grout bedding layer and does not use the connected cavity grouting, it will not occur that the sleeve is not filled due to the bursting of the bottom joint.

[0028] 4. When prefabricated in the factory, the lower half of the full grouting sleeve has been grouted. When assembling on the construction site, only the upper half needs to be grouted, reducing the on-site grouting volume.

[0029] 5. Since the grouting holes and slurry outlet holes of the traditional grouting sleeve are cancelled, the manufacturing process of the precast concrete wall is simplified, the manufacturing cost is reduced, which is beneficial to the popularization of the prefabricated building.

[0030] 6. A fully grouted sleeve is provided inside the precast shear wall. The adjustment length range of the sleeve protruding from the wall is large. Since the length of the grouted sleeve protruding is exactly the thickness of the cast-in-place composite floor slab plus the thickness of the bottom joint, when pouring the floor slab and the bedding layer, the exposed grouted sleeve can be used as a reference, so that the pouring thickness of the floor slab and the laying thickness of the bottom bedding layer can be effectively controlled, ensuring the quality of the project.

[0031] 7. The vertical inserted steel bars protruding from the bottom of the wall body are of a predetermined anchorage length + reserved adjustment length, ensuring the insertion length of the steel bars and preventing the situation of insufficient insertion length of the steel bars.

[0032] 8. Different from the traditional precast concrete wall with the sleeve grouting connection method where the sleeve is located below the upper wall and the steel bars are located above the lower wall, during hoisting, since "the steel bars are below and the sleeve is above", a mirror is usually needed to see the sleeve opening at the bottom of the wall when inserting the steel bars into the sleeve to complete the hoisting, which is very troublesome; for the new type of wall, because the sleeve is located above the lower wall and the steel bars are located below the upper wall, during hoisting, it is "the sleeve is below and the steel bars are above", which is easy to align and convenient for installation. Description of the Drawings

[0033] Figure 1 is a schematic structural diagram of a single precast wall of the present utility model;

[0034] Figure 2 is of the present utility model Figure 1 schematic internal structure diagram of the precast wall;

[0035] Figure 3 is a schematic structural diagram of the overlapping part of two precast walls of the present utility model;

[0036] Figure 4 is a schematic overlapping structure diagram after the cast-in-place of the present utility model;

[0037] Figure 5 is a schematic structural diagram of the use of the fully grouted sleeve of the present utility model. Detailed Embodiments

[0038] The following further illustrates the present utility model in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the exemplified embodiments shall not be construed as limiting the present utility model.

[0039] Refer to Figures 1 to 4As shown in the figure, an embodiment of the precast wall connection node of the present utility model that adopts inverted sleeve grouting and partial in-situ casting combination includes two overlapping precast walls 1. In a single precast wall, the precast wall is in an inverted convex shape. Vertical distribution steel bars and horizontal distribution steel bars are arranged in the precast wall. The vertical distribution steel bars include sleeve connection steel bars 4 arranged at the convex part 3 of the precast wall and cast-in-place connection steel bars 5 arranged on both sides of the convex part of the precast wall. The top of the sleeve connection steel bar is connected to an inverted full grouting sleeve 6, and the top of the sleeve connection steel bar and the inverted full grouting sleeve are grouted and connected during the production stage of the precast component. When assembling on the construction site, only the upper half of the sleeve needs to be grouted, reducing the on-site grouting volume; the bottom of the sleeve connection steel bar extends out of the convex part and forms a lower inserted steel bar 7. The full grouting sleeve adopts an existing structure without damaging the existing connection system. The full grouting sleeve partially extends out of the top surface of the precast wall, and the length of the grouting sleeve exposed above the top of the precast wall is the sum of the floor slab thickness and the bottom mortar layer thickness. The inserted port of the inverted full grouting sleeve is arranged upwards. The full grouting sleeve is partially arranged in the lower precast wall for combination with the superimposed upper precast wall. After the precast wall is prepared, a rubber plug 14 can be inserted into the inserted port to prevent foreign objects from entering the full grouting sleeve during transportation and storage, ensuring the cleanliness inside the full grouting sleeve; the sleeve connection steel bars and the full grouting sleeves are arranged in a plum blossom shape; both ends of the cast-in-place connection steel bars extend out of the top and bottom surfaces of the precast wall respectively and form an upper extended end steel bar 8 and a lower extended end steel bar 9, and hooks 10 are arranged at the ends of the upper extended end steel bar and the lower extended end steel bar;

[0040] During the overlapping process, a floor slab 11 and a mortar layer 12 are arranged on the top of the lower precast wall. The convex part of the upper precast wall abuts against the mortar layer, and the lower inserted steel bar extends into the full grouting sleeve of the lower precast wall and is grouted and connected; the upper extended end steel bar of the lower precast wall and the lower extended end steel bar of the upper precast wall are fixed by tying with wire and form a lap joint section 13. Multiple cast-in-place area horizontal steel bars and stirrups are arranged in the lap joint section, and a cast-in-place area 131 is formed by pouring with ultra-high performance concrete. In the whole precast wall, the direct connection method of the upper extended end steel bar and the lower extended end steel bar eliminates the use of sleeves, so there is no need for high-precision docking, and only the relative positions of adjacent shear walls need to be ensured to be consistent. The lap joint section is fixed by tying with wire, and the operation is convenient.

[0041] And in the above structure, a part of the sleeve needs to be embedded in the precast wall body, and the remaining part extends to the outside. The size of the extended part is usually 140 mm or 150 mm, corresponding to the thickness of the composite floor slab of 120 mm and 130 mm, and the thickness of the bottom grouting layer is 20 mm. Therefore, the sleeve type is selected as a fully grouted sleeve. The fully grouted sleeve meets the length requirement, and a sealing rubber ring is arranged inside the bottom end of the fully grouted sleeve. The sealing rubber ring ensures that after the vertical connecting steel bar extends into the fully grouted sleeve, it has a good sealing effect on the extending end position, avoiding concrete from entering the fully grouted sleeve during the precast process. There are a grouting port and a slurry outlet on the outer wall of the existing fully grouted sleeve. In this application, due to the different slurry injection methods, the grouting port and the slurry outlet can be cancelled. Of course, the existing structure can also be used, and the grouting port and the slurry outlet are blocked with a plug 15, which can also meet the requirements. The plugging of the plug is mainly used to prevent sundries and concrete slurry from entering the interior of the fully grouted sleeve from the positions of the grouting port and the slurry outlet.

[0042] When assembling two adjacent overlapping precast walls, first pour a floor slab on the top of the lower precast wall. During the pouring process, taking the top of the grouting sleeve as the base height, subtract the thickness of the bottom grouting layer downward, and a mark can be made at this position to form a reference base height. The pouring thickness position has a fixed reference point, and the pouring judgment is intuitive, so that the final floor slab will not have a situation of insufficient thickness, thus ensuring the project quality. After the pouring is completed and the curing is over, a bottom grouting layer is prepared on the surface of the floor slab above the lower precast concrete wall, and the surface of the bottom grouting layer is flush with the top of the grouting sleeve.

[0043] After completion, pull out the rubber plug in the plugging port at the top of the fully grouted sleeve, and directly inject grouting material into the interior of the fully grouted sleeve through the plugging port. Since the grouting material is grouted directly by the method of "pouring the slurry", it is visible to the naked eye whether the slurry is filled, which is easy and simple, does not require tools, and does not require pressure maintenance. The grouting layer can be laid by the mortar sitting method, and there will be no problem of bursting at the bottom joint.

[0044] After the grouting sleeve is filled with grouting material, hoist and assemble the upper precast wall. Align the lower plugging steel bar of the upper precast wall with the plugging port of the fully grouted sleeve of the lower precast wall, and then lower the upper precast wall so that the lower plugging steel bar is inserted into the fully grouted sleeve. Finally, the bottom of the upper precast wall contacts the bottom joint to complete the hoisting. For the lower plugging steel bar, its extending length is the sum of the designed anchorage length and the reserved adjustment length of the steel bar. The reserved adjustment length of the steel bar is 5 - 15 mm, ensuring the insertion length of the steel bar and preventing the situation of insufficient insertion length of the steel bar.

[0045] After completion, a plurality of cast-in-place area horizontal steel bars and stirrups are arranged in the lapping section, and the lapping section is cast with ultra-high performance concrete on site by formwork support to form a connecting cast-in-place section, thereby integrating the two shear walls. Among them, the extension lengths of the upper extended-end steel bars and the lower extended-end steel bars are at least 20 times of D, where D is the diameter of the vertical distribution steel bars, and the lower inserted steel bars. During the entire assembly and casting process, there are no problems of difficult positioning and difficult inspection, which is beneficial to improving the assembly quality.

[0046] The above embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A precast wall connection node adopting an inverted sleeve grouting and partial in-situ casting combination, characterized in that, It includes two precast wall bodies arranged overlappingly. The precast wall bodies are in an inverted convex shape. Vertical distributed steel bars and horizontal distributed steel bars are arranged in the precast wall bodies. The vertical distributed steel bars include sleeve connecting steel bars arranged at the convex parts of the precast wall bodies and cast-in-place connecting steel bars arranged on both sides of the convex parts of the precast wall bodies. The top of the sleeve connecting steel bar is connected to an inverted fully grouted sleeve, and the bottom extends out of the convex part to form a lower inserted steel bar. The fully grouted sleeve partially extends out of the top surface of the precast wall body; both ends of the cast-in-place connecting steel bar extend out of the top surface and the bottom surface of the precast wall body respectively to form an upper extended end steel bar and a lower extended end steel bar, and hooks are arranged at the ends of the upper extended end steel bar and the lower extended end steel bar. A floor slab and a grout bedding layer are arranged at the top of the lower precast wall body. The convex part of the upper precast wall body abuts against the grout bedding layer, and the lower inserted steel bar extends into the fully grouted sleeve of the lower precast wall body and is connected by grouting. The upper extended end steel bar of the lower precast wall body and the lower extended end steel bar of the upper precast wall body are fixed by tying with binding wire to form a lapped section. A plurality of cast-in-place area horizontal steel bars and stirrups are arranged in the lapped section, and a cast-in-place area is formed by casting with ultra-high performance concrete.

2. The precast wall connection node adopting the combination of inverted sleeve grouting and partial in-situ casting as claimed in claim 1, wherein The extended lengths of the upper extended end steel bar and the lower extended end steel bar are at least 20 times of D, where D is the diameter of the vertical distributed steel bar.

3. The precast wall connection node adopting the combination of inverted sleeve grouting and partial in-situ casting as claimed in claim 1, wherein The sleeve connecting steel bars and the fully grouted sleeves are arranged in a plum blossom shape.

4. The precast wall connection node using the combination of inverted sleeve grouting and partial in-situ casting as claimed in claim 1, wherein The extended length of the fully grouted sleeve is the sum of the thicknesses of the floor slab and the grout bedding layer.

5. The precast wall connection node adopting the combined method of inverted sleeve grouting and partial in-situ casting as claimed in claim 4, wherein, The extended length of the lower inserted steel bar is greater than or equal to 8 times of D, where D is the diameter of the lower inserted steel bar.

6. The precast wall connection node adopting the combination of inverted sleeve grouting and partial in-situ casting as described in claim 4, wherein The extended length of the lower inserted steel bar is the sum of the design anchorage length and the reserved adjustment length of the steel bar.

7. The precast wall connection node adopting the combined method of inverted sleeve grouting and partial in-situ casting as described in claim 6, wherein The reserved adjustment length of the steel bar is 5 - 15 mm.

8. The precast wall connection node adopting the inverted sleeve grouting and partial in-situ casting combination as claimed in claim 1, wherein, The top of the sleeve connecting steel bar and the inverted fully grouted sleeve are grouted and connected during the production stage of the precast component.

9. The precast wall connection node adopting the combination of inverted sleeve grouting and partial in-situ casting as described in claim 1, wherein No grouting ports and slurry outlet ports are arranged on the outer wall of the fully grouted sleeve, or the grouting ports and slurry outlet ports are blocked.

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