Connecting system of concrete modular structure
Through structural fitting and post-tensioning steel bar technology, the problem of the existing concrete modular building connection method requiring a large amount of wet work is solved, and fast and reliable module connection is achieved, which shortens the construction time and reduces labor consumption.
Patent Information
- Application Number
- CN202421045452.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-02-07
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The connection method of existing concrete modular buildings still requires a large amount of wet work at the construction site, resulting in a long construction period and a large amount of labor, and the short construction period of modular buildings cannot be fully utilized.
The structure fitting form is adopted, and the shear resistance of the concrete module itself and the shearing performance of the concave and convex components after fitting are limited, and the post-tensioning steel bar technology combined with specially set trapezoidal grooves can be used to achieve a close connection between the modules. Reduce on-site wet operations.
It realizes fast and reliable connections of concrete modular buildings, shortens the construction site operation time, reduces labor consumption and dependence on the climate environment.
Smart Images
Figure CN222435512U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of construction, in particular to a connection system of a concrete modular structure. Background Art
[0002] China's construction industrialization began with the release of the "Decision on Adding Walls and Developing the Construction Industry" in 1956, and prefabricated buildings are one of the important products of the construction industrialization process. In the past 70 years of development, the types of prefabricated units in prefabricated buildings have gradually increased, from the original rod-shell-plate units to the box-type structure units, that is, modular units. Compared with traditional prefabricated buildings, modular buildings have a higher degree of prefabrication, up to 85% to 95%, which can further shorten the on-site operation time (Li Shuo. Research on the dynamic mechanism of the development of construction industrialization [D]. Qingdao University of Technology, 2022.). There are many examples of modular building applications in countries around the world. In recent years, there are examples such as the B2 Building in the United States, which was built using 363 steel structure modular units with computer digital assisted control (Jian Weitong. Modular assembled integral building structure design with shear walls [D]. Guangzhou University, 2019.), or the Colin Building, a concrete modular structure built in Singapore using the Australian Hickory building system (Thai HT. A review on modular construction for high-rise buildings [J]. Structures, 2020, 28: 1265–1290.).
[0003] In the process of modular building development, steel structure modular units have many time-saving and labor-saving methods of connecting units due to their light weight, high strength, weldability, and easy production. However, concrete modular units have no simple, convenient and practical connection system due to their heavy weight, long maintenance time, and high difficulty in lifting. At present, most of the usage scenarios are still to expose the coarse aggregate on the connection surface between the two modules during the prefabrication process to increase the concrete bonding surface area. After the module position is determined at the construction site, cast-in-place concrete is cast between the surfaces of the two components to be connected to form a post-cast fixing belt to achieve the connection of concrete modular units.
[0004] According to the connection process of the above concrete modular units, it can be seen that the existing connection system still requires a lot of wet work on the construction site, and the process requires a long construction period and consumes a lot of labor. It is also not conducive to fully exerting the advantages of the short construction period that modular buildings themselves want to achieve. Therefore, it is very necessary to explore a faster and more practical way to connect concrete modular units that can further shorten the construction period. Utility Model Content
[0005] In view of the above background, the utility model proposes a connection system of concrete modular structure, which includes the inter-layer vertical connection mode between concrete modules and the horizontal connection mode of adjacent modules on the same layer. Compared with the on-site wet operation process that is still mostly used in concrete modular buildings, the utility model adopts the form of structural interlocking, and uses the heavy weight of the concrete module itself and the shear resistance of the material of the concave and convex components after the structural interlocking to limit the inter-layer displacement after the vertical connection of the concrete module layers. In addition, the utility model adopts post-tensioned steel bar technology, combined with specially set trapezoidal grooves, so that adjacent modules are tightly connected in pairs, and the steel bars are not exposed. The operation of post-tensioned steel bar technology is not complicated, and compared with the on-site cast concrete connection surface, it can greatly reduce the amount of wet operation work required on site. Through the connection system described in the utility model, when the modular units are connected, the on-site operation time of modular building construction can be further reduced under the premise of ensuring the reliable connection between concrete units.
[0006] The utility model is implemented by at least one of the following technical solutions.
[0007] A connection system of a concrete modular structure includes a vertical connection method and a horizontal connection method between a plurality of precast concrete modules, wherein the precast concrete modules include a precast concrete top plate, a precast concrete bottom plate, a precast connection wall and a precast common wall, and the precast connection wall and the precast common wall are arranged between the precast concrete top plate and the precast concrete bottom plate.
[0008] Preferably, the vertical connection is formed by the precast concrete modules being connected by interlocking concave and convex parts of the precast concrete top plate and the precast concrete bottom plate.
[0009] Preferably, the horizontal connection is achieved by prefabricating the connection wall and then tensioning the steel bars.
[0010] Preferably, the precast concrete top plate is provided with a groove plate, a groove block and a rubber ring, and the rubber ring is located on the inner wall of the groove of the groove plate.
[0011] Preferably, the height of the groove block is lower than the height of the groove plate.
[0012] Preferably, the precast concrete bottom plate is provided with a convex ring and a convex block, and the convex ring and the convex block have the same height.
[0013] Preferably, during vertical connection, the convex ring is embedded in the inner wall of the rubber ring, and the convex block of the precast concrete bottom plate is embedded in the concave block of the precast concrete top plate.
[0014] Preferably, trapezoidal grooves are staggeredly reserved on both horizontal sides of the prefabricated connecting wall, and a steel bar channel reserved for post-tensioning steel bars is provided starting from the trapezoidal groove toward the other end of the prefabricated connecting wall.
[0015] Preferably, after the steel bars are placed in the reserved steel bar holes, the steel bars are post-tensioned and anchored by anchoring pieces.
[0016] Preferably, the precast concrete top plate, precast concrete bottom plate, precast connecting wall and precast common wall are formed by one-time casting through corresponding molds during prefabrication, and can be mass-produced and pre-assembled into modular house units in a workshop and transported to on-site operations.
[0017] Compared with the prior art, the beneficial effects of the utility model are:
[0018] 1. The connection method proposed in the present invention is based on the modification of the precast wall and precast panel in the precast concrete module. Different from the ordinary precast wall panels with a flat surface, the precast concrete top plate and precast concrete bottom plate mentioned in the present invention only need to be cast once in a specific mold, and demolded after curing; while the precast connecting wall needs to embed the pipe mold in a specific position during the concrete casting process, and demold the wall mold and the pipe mold in turn after the curing. The mold can be reused to realize the mass production of structural components. The above structural components are pre-assembled into modular house units in the workshop and transported to the site for operation. The prefabrication process is simple and convenient, and the operation process has no effect on the difficulty and time of prefabrication of the modular units.
[0019] 2. The utility model adopts the method of embedding the bottom plate convex block of the upper module into the top plate groove of the lower module for connection. Considering the heavy weight of the upper module and the difficulty in aligning it during hoisting, the convex ring of the upper bottom plate is processed with a curved surface, and a rubber ring with a curved surface is attached to the groove of the lower top plate. When the two are in contact with each other, the curved surface can guide the upper and lower modules to slip, which is conducive to module alignment, and the rubber ring can also play a buffering role.
[0020] 3. The utility model adopts the method of post-tensioning steel bars to connect the prefabricated connecting walls in the prefabricated concrete modules. The two adjacent modules that are in contact with each other are symmetrical along the contact surface. When the two modules are in contact, the trapezoidal grooves are located at both ends of the prefabricated connecting walls of the two modules, and the reserved steel bar holes run through the connecting walls, which can be used for post-tensioning steel bars. After the steel bars are tensioned, the anchors at the ends of the steel bars are placed in the trapezoidal grooves, and the positions of the post-tensioned steel bars between the middle module and the left and right modules do not conflict. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of a connection system of a concrete modular structure in this example;
[0022] Figure 2 A schematic diagram of a precast concrete top plate of a precast concrete module in this example;
[0023] Figure 3A schematic diagram of a precast concrete base plate of a precast concrete module in this example;
[0024] Figure 4 This is a cross-sectional view of the vertical connection of the precast concrete modules in this example;
[0025] Figure 5 This is a schematic diagram of the horizontal connection of precast concrete modules in this example;
[0026] In the figure: 1. precast concrete module, 2. precast concrete top plate, 3. precast concrete bottom plate, 4. precast connecting wall, 5. precast ordinary wall, 6. groove plate, 7. groove block, 8. rubber ring, 9. convex ring, 10. convex block, 11. trapezoidal groove, 12. reserved steel bar channel, 13. steel bar, 14. anchor. DETAILED DESCRIPTION
[0027] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.
[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0029] The research direction of the present utility model relies on concrete modular buildings. At present, in the actual use of concrete modular buildings, the connection between modules is still carried out in the form of on-site wet operations, that is, when the two modules are prefabricated, the coarse aggregate is exposed on the planned connection surface. After being transported to the site, concrete is cast between the exposed surfaces of the coarse aggregate of the modules to form a connection belt, so that after maintenance, the overall structure can achieve the effect of being equivalent to cast-in-place. This method is time-consuming and labor-intensive, and the amount of on-site wet operations is large, which cannot fully reflect the advantages of modular buildings. The present utility model proposes a concrete modular building module connection system based on dry connection. During on-site operations, the only work required is to align and overlap, embed the upper and lower modules, and tension the prestressed tendons between adjacent modules on the same floor. This reduces the workload of cast-in-place concrete to a certain extent, saves labor, shortens working hours, and is not affected by climate and environmental factors.
[0030] like Figure 1As shown, a connection system of a concrete modular structure of this embodiment includes a vertical connection method and a horizontal connection method between multiple precast concrete modules 1, and the precast concrete module 1 includes a precast concrete top plate 2, a precast concrete bottom plate 3, a precast connection wall 4 and a precast common wall 5;
[0031] The precast concrete top plate 2, precast concrete bottom plate 3, and precast common wall 5 can be formed by pouring concrete through corresponding molds during precasting and demolding after curing, while the precast connecting wall 4 needs to embed pipe molds in the pouring process during precasting to form reserved steel bar channels 12 by demolding, and the wall molds and pipe molds are demolded in turn after curing to form the precast connecting wall 4. The above components can be mass-produced and pre-assembled into modular house units in the workshop and transported to the site for operation.
[0032] like Figure 2 As shown, the precast concrete top plate 2 includes a groove plate 6, a groove block 7, and a rubber ring 8, wherein the rubber ring 8 is adhered to the inner wall of the groove of the groove plate 6;
[0033] As a preferred embodiment, the height of the groove block 7 is lower than the height of the groove plate 6 .
[0034] like Figure 3 As shown, the precast concrete bottom plate 3 includes a convex ring 9 and a convex block 10. The vertical connection method described in the utility model is connected by embedding the convex block of the bottom plate of the upper module into the groove of the top plate of the lower module. Considering that the upper module is heavy and difficult to align during hoisting, the utility model makes a curved surface treatment on the convex ring of the upper bottom plate, and a rubber ring with a curved surface is attached to the groove of the lower top plate. When the two contact each other, the curved surface can guide the upper and lower modules to slip, which is conducive to module alignment, and the rubber ring can also play a buffering role. Since the convex ring of the upper module and the convex block are of the same height, and the height of the rubber ring in the lower groove plate is higher than the groove block, the convex ring of the upper bottom plate first contacts the rubber ring of the lower top plate when in contact, guiding the two modules to slip, achieving a pre-alignment effect; after being embedded to a certain depth, the convex block of the bottom plate of the upper module begins to embed into the bottom groove of the lower module, realizing a strong connection between the modules between the layers. When the modules are in a tightly connected state, the gravity of the upper stacked concrete modules can provide a restraining force to resist the separation of the modules in the vertical direction, while the strong connection formed by the upper and lower concave and convex keys can provide a restraining force to resist the inter-layer displacement of modules in different layers in the horizontal direction.
[0035] As a preferred embodiment, the convex ring 9 and the protrusion 10 have the same height.
[0036] like Figure 4The figure shows a cross-sectional view of a vertical connection of a precast concrete module. The vertical connection is formed by the precast concrete module 1 being connected by the interlocking concave and convex parts of the precast concrete top plate 2 of the lower module and the precast concrete bottom plate 3 of the upper module;
[0037] The horizontal connection method described in the utility model adopts the method of post-tensioning steel bars to connect the prefabricated connection wall in the prefabricated concrete module. The prefabricated connection wall is provided with a trapezoidal groove, which is staggered along both sides of the wall, and a reserved steel bar channel is provided from the trapezoidal groove as the starting point to the other side of the wall. The adjacent modules that contact each other are symmetrical along the contact surface, so when the two modules are in contact, the trapezoidal groove is located at both ends of the prefabricated connection wall of the two modules, and the reserved steel bar channel is connected in the connection wall, which can be used for post-tensioning steel bars. After the tensioning of the steel bars is completed, the anchors at the ends of the steel bars are placed in the trapezoidal groove, and the positions of the post-tensioning steel bars between the middle module and the left and right modules do not conflict, and are arranged alternately from top to bottom, and the steel bars are not exposed except for the ends. When the modules are in a tightly connected state, the prestressing force and tensile bearing capacity of the post-tensioning steel bars can provide a restraining force to resist the separation of adjacent modules in a direction perpendicular to the contact surface, and the shear bearing capacity of the post-tensioning steel bars can provide a restraining force to resist the displacement of adjacent modules in a direction parallel to the contact surface.
[0038] like Figure 5 The schematic diagram of the horizontal connection of precast concrete modules shown in the figure, wherein the horizontal connection is achieved by the concrete modules through post-tensioning steel bars 13 in the precast connecting wall 4; the precast connecting wall 4 has staggered trapezoidal grooves 11 on both sides of the wall, and a steel bar channel 12 reserved for post-tensioning steel bars is left starting from the trapezoidal groove towards the other end of the precast connecting wall.
[0039] The working principle of the utility model is: in the vertical connection, the upper and lower modules are connected by the concave and convex components on the plate, and the adjacent modules on the same layer are connected horizontally by post-tensioning steel bars. The working principles of the two are:
[0040] During vertical connection, the convex ring 9 of the precast concrete bottom plate 3 of the upper precast concrete module 1 is embedded in the inner wall of the rubber ring 8 of the precast concrete top plate 2 of the lower precast concrete module 1, and the convex block 10 of the precast concrete bottom plate 3 is embedded in the concave block 7 of the precast concrete top plate 2.
[0041] During the vertical connection process, the upper precast concrete module 1 is hoisted downward and embedded in the lower precast concrete module 1. The convex ring 9 of the upper module bottom plate first contacts the rubber ring 8 of the lower module top plate. The outer wall of the convex ring 9 and the inner wall of the rubber ring 8 both contain micro-curved surfaces, which can reduce resistance during contact and guide the displacement of the upper precast concrete module 1. Due to the height difference between the groove block 7 and the groove plate 6, before the convex block 10 of the upper module bottom plate is embedded in the groove block 7 of the lower module top plate, the convex ring 9 contacts the rubber ring 8 to pre-align the upper and lower precast concrete modules 1, and then the convex block 10 is embedded in the groove block 7 to play a strong connection role.
[0042] After the vertical connection is formed, the gravity of the upper stacked modules provides the vertical restraint force between the upper and lower modules when the modules are connected, and the engagement of the convex ring 9 and the groove plate 6 as well as the engagement of the convex block 10 and the groove block 7 provides the horizontal restraint force to resist the inter-layer displacement between the upper and lower modules.
[0043] 2. During horizontal connection, the precast connecting walls 4 of the two precast concrete modules 1 that are in contact with each other in the horizontal direction are symmetrical along the contact surface of the two modules. After the symmetry, the trapezoidal grooves 11 of the precast connecting walls 4 of the two modules are distributed at the same horizontal height at both ends of the two adjacent precast connecting walls 4. After the steel bars 13 are placed in the reserved steel bar channels 12, the steel bars 13 are tensioned, and then the steel bars are anchored by the anchors 14, and the channels are grouted. After the whole process of tensioning the steel bars is completed, the precast connecting walls 4 of the two precast concrete modules 1 in the horizontal direction are connected to realize the horizontal connection of the modules.
[0044] During horizontal connection, along the multiple horizontally upward concrete modules 1, the prefabricated connecting walls 4 of two adjacent concrete modules 1 are symmetrical along the module contact surface, and the adjacent modules are connected in pairs. Since the reserved trapezoidal grooves 11 are staggered on both sides of the prefabricated wall, and the reserved steel bar channels 12 extend from one side of the trapezoidal grooves 11 to the other side of the wall surface of the prefabricated connecting wall 4, the notches of the trapezoidal grooves 11 on the prefabricated concrete modules 1 connected in pairs are opposite, and the reserved steel bar channels 12 are connected.
[0045] After completing the horizontal connection, the positions of the post-tensioned steel bars 13 between the middle module and the left and right modules do not conflict with each other, and they are vertically staggered from top to bottom. After tensioning, the steel bars except the ends are not exposed. The end steel bar heads and the post-tensioned anchors 14 are located in the reserved trapezoidal grooves 11 after the steel bars are tensioned, and do not extend beyond the side of the wall.
[0046] After the horizontal connection is formed, the restraint force between two adjacent modules along the module separation direction is provided by the prestress and tensile bearing capacity of the post-tensioned steel bars 13; the restraint force between two adjacent modules in the direction parallel to the module contact surface is provided by the shear bearing capacity of the steel bars 13.
[0047] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.
[0048] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A connection system for a concrete modular structure, comprising a vertical connection method and a horizontal connection method between a plurality of prefabricated concrete modules (1), characterized in that: The precast concrete module (1) comprises a precast concrete top plate (2), a precast concrete bottom plate (3), a precast connecting wall (4) and a precast common wall (5); the precast connecting wall (4) and the precast common wall (5) are arranged between the precast concrete top plate (2) and the precast concrete bottom plate (3); The precast concrete top plate (2) is provided with a groove plate (6), a groove block (7), and a rubber ring (8), wherein the rubber ring (8) is located on the inner wall of the groove of the groove plate (6); The height of the groove block (7) is lower than the height of the groove plate (6); The precast concrete bottom plate (3) is provided with a convex ring (9) and a convex block (10), and the convex ring (9) and the convex block (10) have the same height.
2. A connection system for a concrete modular structure according to claim 1, characterized in that: The vertical connection method is that the precast concrete module (1) is connected by interlocking the concave and convex parts of the precast concrete top plate (2) and the precast concrete bottom plate (3).
3. The connection system of a concrete modular structure according to claim 1, characterized in that: The horizontal connection method is to achieve horizontal connection by post-tensioning steel bars (13) through a prefabricated connection wall (4).
4. The connection system of a concrete modular structure according to claim 1, characterized in that: During vertical connection, the convex ring (9) is embedded in the inner wall of the rubber ring (8), and the convex block (10) of the precast concrete bottom plate (3) is embedded in the concave block (7) of the precast concrete top plate (2).
5. The connection system of a concrete modular structure according to claim 3, characterized in that: The prefabricated connection wall (4) has alternately reserved trapezoidal grooves (11) on both horizontal sides, and a reserved steel bar channel (12) for post-tensioning steel bars is provided starting from the trapezoidal groove toward the other end of the prefabricated connection wall.
6. A connection system for a concrete modular structure according to claim 5, characterized in that: After the steel bars (13) are placed in the reserved steel bar holes (12), the steel bars (13) are tensioned and anchored by anchoring pieces (14).
7. A connection system for a concrete modular structure according to any one of claims 1 to 6, characterized in that: The precast concrete top plate (2), the precast concrete bottom plate (3), the precast connecting wall (4) and the precast common wall (5) are formed by pouring corresponding molds at one time during prefabrication, and can be mass-produced and pre-assembled into modular house units in a workshop and transported to on-site operations.