Concrete modular building connection structure and construction method thereof

Abstract

The application discloses a concrete module building connecting structure, which comprises two or four connecting pieces, one connecting piece is arranged on each of two or four left and right concrete walls, each connecting piece comprises a pair of corner pieces and a middle plate body, each corner piece has a first side wall and a second side wall, each first side wall and the second side wall connected with the first side wall are arranged along two adjacent edges of the corresponding concrete wall, the pair of corner pieces are arranged at the upper and lower corners of the concrete wall, the middle plate body is located between the pair of corner pieces, and the two ends of the middle plate body are fixedly connected with the first side walls of the pair of corner pieces, two left and right middle plate bodies are connected and located between the two concrete walls, at least one fixing plate is arranged between any two opposite first side walls and any two opposite second side walls, and each fixing plate is connected with the two corner pieces. The application can enhance the rigidity of the connecting direction of the module unit, and the connecting structure is detachable and reusable.

Description

Technical Field

[0001] This invention relates to the field of structural engineering technology. More specifically, this invention relates to concrete modular building connection structures and their construction methods. Background Technology

[0002] Developing prefabricated buildings represents a significant transformation in construction methods. Modular buildings currently boast the highest assembly rate among prefabricated building types, typically exceeding 90%. Currently, modular buildings primarily utilize steel, concrete, and wood structures. Steel-structured modular buildings suffer from complex joint construction and high steel consumption, while wood-structured modular buildings exhibit low reliability in joint connections and high costs. Concrete modular buildings, on the other hand, offer low cost and good sealing. Therefore, developing reliable, simple, and easy-to-construct connection joints for concrete modular buildings is crucial for promoting their application.

[0003] CN 218405818 U provides a modular concrete structure upper and lower connection node. This node is achieved by connecting T-shaped steel plates attached to the bottom and top of the upper and lower module units using shear connectors and high-strength bolts. This node design requires pre-drilling holes in the floor slab at the bolt connection area, followed by concrete pouring to seal the holes after bolt installation. This involves wet work on-site, and the bolt connection points are offset from the center of the longitudinal and transverse walls of the module unit, resulting in eccentric stress and weak connection stiffness. Furthermore, this connection method only solves the problem of connecting upper and lower module units, leaving the problem of connecting module units within the same floor unresolved.

[0004] CN 214329297 U provides a connection structure for prefabricated assembled buildings. This connection structure involves pre-drilling holes for reinforcing bars in the walls and floors, and connecting the modular unit walls and floors, as well as the modular units themselves, through reinforcing bars and post-grouting. This connection structure does not have a detachable and reusable function and is only suitable for permanent buildings.

[0005] Existing concrete modular building connection methods either have indirect stress distribution and weak node stiffness, or adopt traditional post-grouting methods, which have narrow applicability and are inconvenient for on-site operation, resulting in significant limitations.

[0006] Therefore, a new method for connecting concrete modular buildings is needed. Summary of the Invention

[0007] The purpose of this invention is to provide a concrete modular building connection structure and its construction method. By setting a fixing plate, the fixing plate can be detachably connected to the corner piece, and the two middle plates arranged opposite to each other on the left and right can be detachably connected. This realizes the horizontal and vertical connection between modular units. Compared with conventional horizontal unidirectional connection and corner connection only, the stiffness of the modular unit connection direction is greatly enhanced. It can realize the connection between upper and lower layer modular units and the same layer modular units, and the connection structure can be disassembled and reused.

[0008] To achieve these objectives and other advantages of the present invention, a concrete modular building connection structure is provided for connecting two or four concrete walls. When there are two concrete walls, the two concrete walls are arranged side by side; when there are four concrete walls, one is arranged vertically and horizontally. The connection structure includes:

[0009] Two or four connectors are provided, one connector is provided on each of any two left and right concrete walls, each connector includes a pair of corner pieces and a middle plate, each corner piece has a first side wall and a second side wall connected together, each first side wall and the second side wall connected thereto are respectively provided along two adjacent sides of the corresponding concrete wall, each pair of corner pieces are provided at the upper and lower corners of the corresponding concrete wall, each middle plate is located between its corresponding pair of corner pieces, and its two ends are respectively fixedly connected to the first side wall of its corresponding pair of corner pieces, and the two middle plates on any two left and right concrete walls are detachably connected and are located between its corresponding two concrete walls;

[0010] At least one fixing plate is provided between any two opposing first sidewalls and any two opposing second sidewalls, and each fixing plate is detachably connected to its corresponding two corner pieces.

[0011] Preferably, in the concrete modular building connection structure, each corner member has a first sidewall and a second sidewall that are perpendicular to each other.

[0012] Preferably, in the concrete modular building connection structure, when there are four concrete walls, the four fixing plates in the middle are connected to each other to form a cross-shaped connection plate.

[0013] Preferably, in the concrete modular building connection structure, a fixing plate is also provided at each of the second side walls at the top and bottom, and the three fixing plates at the top and bottom are connected to each other to form T-shaped connecting plates.

[0014] Preferably, in the concrete modular building connection structure, each corner piece is an L-shape with a hollow interior and open front and / or rear sides. Any two opposing first sidewalls and the fixing plate between them, as well as any two opposing second sidewalls and the fixing plate between them, are connected by first high-strength bolts. Each first high-strength bolt passes through its corresponding two first sidewalls and fixing plates, and two second sidewalls and fixing plates. The bolt head and nut of each first high-strength bolt are located inside the two corner pieces corresponding to them. Each second sidewall at the top and bottom and its corresponding fixing plate are connected by second high-strength bolts. Each second high-strength bolt passes through its corresponding second sidewall and fixing plate, and each second sidewall and its corresponding fixing plate are respectively locked between the bolt head and nut of its corresponding second high-strength bolt.

[0015] Preferably, in the concrete modular building connection structure, each connector is connected to the horizontal reinforcement, vertical reinforcement, and studs of the concrete wall.

[0016] Preferably, in the concrete modular building connection structure, each intermediate plate is provided with a pair of L-shaped connectors at intervals. One end of each pair of L-shaped connectors is connected to the corresponding intermediate plate, and the other end is positioned opposite to it. An I-shaped connector is inserted into any two pairs of L-shaped connectors arranged on the left and right. Each I-shaped connector is connected to its corresponding two pairs of L-shaped connectors to form a cuboid shape. The top and bottom of each I-shaped connector abut against its corresponding two fixing plates.

[0017] Preferably, in the concrete modular building connection structure, when there are four concrete walls, a top positioning wedge is provided at the top of each of the two lower concrete walls, and a bottom positioning wedge is provided at the bottom of each of the two upper concrete walls. Each of the two bottom positioning wedges has a through hole, and one top positioning wedge corresponds to one through hole. The lower parts of the two bottom positioning wedges and the two top positioning wedges are fixed in their corresponding corner pieces. The upper parts of the two top positioning wedges pass through their corresponding second sidewalls and fixing plates and are inserted into their corresponding through holes. The cross-sections of the portions of the two through holes and the two top positioning wedges within their corresponding through holes are all convex. The protrusions of the left-side through hole and the left-side top positioning wedge face to the right, and the protrusions of the right-side through hole and the right-side top positioning wedge... The protrusions of the shaped parts all face to the left. The inner wall of each bottom positioning wedge and the outer wall of the portion of each top positioning wedge located in the corresponding through hole include a third side wall, a pair of fourth side walls and a pair of fifth side walls perpendicular to the third side wall, a sixth side wall and a pair of seventh side walls parallel to the third side wall. The third side wall is adjacent to the pair of fourth side walls and is opposite to the middle of the sixth side wall. Each third side wall and the pair of fifth side walls gradually slope outward from its top to its bottom. The width of the fifth side wall and the third side wall of the two bottom positioning wedges is greater than the width of the fifth side wall and the third side wall of the portion of the top positioning wedge located in the corresponding through hole. The third side wall, the pair of fifth side walls and the sixth side wall of the portion of the top positioning wedge located in the corresponding through hole abut against the third side wall, the pair of fifth side walls and the sixth side wall of the corresponding bottom positioning wedge.

[0018] Preferably, in the concrete modular building connection structure, the width of each connector and each fixing plate is the same as the thickness of the concrete wall.

[0019] Construction methods for concrete modular building connection structures, when there are two concrete walls, include:

[0020] Set up the two concrete walls on the left and right, then connect the two bottom corner pieces to the T-shaped connecting plates respectively, then insert the I-shaped connectors into the two pairs of L-shaped connectors, and finally connect the two top corner pieces to the T-shaped connecting plates respectively.

[0021] When there are four concrete walls, the construction methods include:

[0022] Step 1: Position the two lower concrete walls to the left and right, then connect the two corner pieces at the bottom of the two lower concrete walls to their corresponding fixing plates.

[0023] Step 2: Insert an I-shaped connector into the two pairs of L-shaped connectors on the two concrete walls of the lower layer;

[0024] Step 3: Install the cross-shaped connecting plate;

[0025] Step 4: Hoist the two upper concrete wall sections separately, using their respective top and bottom positioning wedges for positioning during hoisting.

[0026] Step 5: Connect the cross-shaped connecting plate to its four corresponding corner pieces;

[0027] Step 6: Insert another I-shaped connector into the two pairs of L-shaped connectors on the two upper concrete walls, and then connect the two corner pieces at the top of the two upper concrete walls to their corresponding fixing plates.

[0028] The present invention has at least the following beneficial effects:

[0029] The concrete modular building connection structure of this invention achieves the connection between modular units by setting up a connecting plate, several high-strength bolts, and I-shaped connectors, realizing zero-wet operation and fully mechanical connection on the construction site. The stress requirements of different nodes can be met by adjusting the size of the connectors and the number of high-strength bolts. It is economical, practical, easy to operate, and can be disassembled without affecting the normal use space of the modular unit.

[0030] Compared to the upper and lower connection nodes of a modular concrete structure in patent CN 218405818 U, the connections of the present invention are all located inside the wall, which has little impact on the floor slab and does not require post-poured concrete; compared to the bolt connection in the prior art which is offset from the wall and causes the node to be eccentrically stressed, the stress center of the connecting bolts of the present invention coincides with the centroid of the converging wall, and the stress is more direct.

[0031] Compared to the connection structure of prefabricated assembled buildings provided by patent CN 214329297 U, the connection of the present invention has a wider range of applications, applicable to both detachable temporary buildings and permanent buildings.

[0032] This invention achieves horizontal and vertical connections between modular units through T-shaped connecting plates, cross-shaped connecting plates, and I-shaped connectors. Compared to conventional unidirectional horizontal connections and corner-only connections, the stiffness of the modular unit connections is greatly enhanced. For north-south walls of modular units, the stiffness in that direction is often weakened by the presence of doors and windows. If unidirectional horizontal connections or corner-only connections are used, the stiffness between modular units in that direction is simply added together. With the bidirectional connection of this invention, the wall in that direction of the modular units forms a close connection and cooperates in bearing force, achieving a four-fold stiffness amplification effect.

[0033] The connection of the present invention can meet the load-bearing capacity requirements of different connection nodes and the stiffness requirements of different modular buildings by adjusting the size of the connector, the specifications or quantity of high-strength bolts.

[0034] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a connector according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure connecting two concrete walls according to an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the connection between the four corner pieces and the cross-shaped connecting plate according to an embodiment of the present invention;

[0038] Figure 4 This is a structural diagram of the concrete wall located in the lower left corner when there are four concrete walls, according to an embodiment of the present invention.

[0039] Figure 5 This is a structural diagram of the concrete wall located in the upper left corner when there are four concrete walls according to an embodiment of the present invention.

[0040] Figure 6 This is a schematic diagram of the structure of a top positioning wedge according to an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of the structure of a bottom positioning wedge according to an embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of a structure according to an embodiment of the present invention, showing an I-shaped connector inserted into two pairs of L-shaped connectors;

[0043] Figure 9 This is a construction flowchart of a concrete modular building connection structure according to an embodiment of the present invention;

[0044] Figure 10 This is a structural schematic diagram of the top of the top positioning wedge and the bottom of the through hole according to an embodiment of the present invention;

[0045] Figure 11 This is a schematic diagram of the structure of a portion of the top positioning wedge according to an embodiment of the present invention being stuck in the through hole;

[0046] Figure 12 yes Figure 8 Enlarged structural diagram at point A in the middle. Detailed Implementation

[0047] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0048] It should be noted that in the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] like Figures 1 to 12 As shown, this invention provides a concrete modular building connection structure for connecting two or four concrete wall panels 1. When there are two concrete wall panels 1, such as... Figure 2 As shown, two concrete walls 1 are set on the left and right. When there are four concrete walls 1, as... Figure 3 As shown, four concrete walls 1 are installed on each of the top, bottom, left, and right sides, and the connecting structure includes:

[0050] Two or four connectors 3 are installed on any two concrete walls 1, one connector 3 on each side, such as... Figure 1 As shown, each connector 3 includes a pair of corner pieces 31 and a middle plate 32. Each corner piece 31 has a first sidewall 311 and a second sidewall 312 connected together. Each first sidewall 311 and the second sidewall 312 connected thereto are respectively arranged along two adjacent sides of the corresponding concrete wall 1. Each pair of corner pieces 31 is located at the upper and lower corners of the corresponding concrete wall 1. Each middle plate 32 is located between its corresponding pair of corner pieces 31, and its two ends are respectively fixedly connected to the first sidewall 311 of its corresponding pair of corner pieces 31. The two middle plates 32 on any two left and right concrete walls 1 are detachably connected and are located between their corresponding two concrete walls 1. Figure 1 As shown, for any connector 3, a pair of corner pieces 31 and an intermediate plate 32 are integrally formed, and the intermediate plate 32 extends from the first sidewall 311 of the pair of corner pieces 31. The connector 3 is located at the corner and wall of the module unit.

[0051] At least one fixing plate is provided between any two opposing first sidewalls 311 and any two opposing second sidewalls 312, and each fixing plate is detachably connected to its corresponding two corner pieces 31.

[0052] The concrete modular building connection structure provided by this solution allows the fixing plate and corner piece 31 to be detachably connected, and the two middle plates 32 arranged opposite to each other to be detachably connected. This achieves both horizontal and vertical connections between modular units. Compared with conventional horizontal unidirectional connections and corner connections only, the stiffness of the modular unit connection direction is greatly enhanced. It can also achieve connections between upper and lower layer modular units and between modular units on the same layer. Furthermore, the connection structure is detachable and reusable.

[0053] Specifically, in the concrete modular building connection structure, any corner piece 31 has a first sidewall 311 and a second sidewall 312 that are perpendicular to each other.

[0054] Specifically, in the concrete modular building connection structure, when there are four concrete walls 1, the four middle fixing plates are connected to each other to form a cross-shaped connecting plate 10, such as... Figure 3 As shown. Horizontal and vertical connections are achieved through the cross-shaped connecting plate 10.

[0055] Specifically, in the concrete modular building connection structure, a fixing plate is also provided at each of the second side walls 312 at the top and bottom. The three fixing plates at the top and bottom are connected to each other and form T-shaped connecting plates 2, such as... Figure 2 As shown. Horizontal connection is achieved through T-shaped connecting plate 2.

[0056] Specifically, in the aforementioned concrete modular building connection structure, such as Figure 3 As shown, each corner piece 31 is hollow inside and L-shaped with open front and / or rear sides, which facilitates the installation of high-strength bolts. Any two opposing first sidewalls 311 and the fixing plate between them, as well as any two opposing second sidewalls 312 and the fixing plate between them, are connected by first high-strength bolts. Each first high-strength bolt passes through its corresponding two first sidewalls 311 and fixing plates, and its corresponding two second sidewalls 312 and fixing plates. The bolt head and nut of each first high-strength bolt are located inside its corresponding two corner pieces 31. Figure 2 As shown, each of the second sidewalls 312 located at the top and bottom and their corresponding fixing plates are connected by second high-strength bolts. Each second high-strength bolt passes through its corresponding second sidewall 312 and fixing plate, and each second sidewall 312 and its corresponding fixing plate are respectively locked between the bolt head and nut of its corresponding second high-strength bolt.

[0057] The corner fitting 31 is an L-shaped tube with one or both sides open and reinforced with several stiffening ribs.

[0058] The stress requirements of different nodes can be met by adjusting the size of connector 3 and the number of high-strength bolts 11.

[0059] The cross-shaped connecting plate 10, the T-shaped connecting plate 2, and the corner piece 31 are connected by high-strength bolts, making the connection structure suitable for both detachable temporary buildings and permanent buildings.

[0060] Specifically, in the concrete modular building connection structure, each connector 3 is connected to the horizontal wall reinforcement 4, vertical wall reinforcement 5, and studs 6 inside the concrete wall 1.

[0061] The connector 3 is connected to the wall by welding it to the horizontal reinforcing bars 4, vertical reinforcing bars 5 and studs 6 in the area of ​​the wall.

[0062] To strengthen the connection between connector 3 and the modular unit wall, reinforcing ribs can be added to the modular unit wall along the wall thickness direction and welded to connector 3.

[0063] Specifically, in the aforementioned concrete modular building connection structure, such as Figure 8 and Figure 12 As shown, each intermediate plate 32 is provided with a pair of L-shaped connectors 9 at intervals. One end of each pair of L-shaped connectors 9 is connected to the corresponding intermediate plate 32, and the other end is set opposite to it. An I-shaped connector 12 is inserted into any two pairs of left and right L-shaped connectors 9. Each I-shaped connector 12 is connected to the two pairs of L-shaped connectors 9 corresponding to it to form a cuboid shape. The top and bottom of each I-shaped connector 12 abut against the two fixed plates corresponding to it.

[0064] The modular units of this invention are connected horizontally and vertically through a T-shaped connecting plate 2, a cross-shaped connecting plate 10, and an I-shaped connector 12, which can greatly enhance the connection rigidity of the modular units.

[0065] Specifically, in the aforementioned concrete modular building connection structure, such as Figures 4-7As shown, when there are four concrete walls 1, the top of the two lower concrete walls 1 is respectively provided with a top positioning wedge 7, and the bottom of the two upper concrete walls 1 is respectively provided with a bottom positioning wedge 8. Each of the two bottom positioning wedges 8 has a through hole 81. One top positioning wedge 7 corresponds to one through hole 81. The lower parts of the two bottom positioning wedges 8 and the two top positioning wedges 7 are respectively fixed in their corresponding corner pieces 31. The upper parts of the two top positioning wedges 7 pass through their corresponding second sidewalls 312 and fixing plates and are inserted into their corresponding through holes 81. The cross-sections of the portions of the two through holes 81 and the two top positioning wedges 7 located within their corresponding through holes 81 are all convex. The portion located on the left side... The through hole 81 and the protrusion of the top positioning wedge 7 on the left face right, while the through hole 81 on the right and the protrusion of the top positioning wedge 7 on the right face left. The inner wall of each bottom positioning wedge 8 and the outer wall of each top positioning wedge 7 located within its corresponding through hole 81 include a third side wall 71, a pair of fourth side walls 72 perpendicular to the third side wall 71, a pair of fifth side walls 74, a sixth side wall 75 parallel to the third side wall 71, and a pair of seventh side walls 73. The third side wall 71 is adjacent to the pair of fourth side walls 72 and opposite the middle of the sixth side wall 75. Each third side wall 71 and the pair of fifth side walls 74 gradually slope outwards from their top to their bottom, meaning the cross-sectional dimensions of the top of each top positioning wedge 7 and the top of the through hole 81 are the smallest. Figure 10 As shown, the widths of the fifth sidewall 74 and the third sidewall 71 of the two bottom positioning wedges 8 are greater than the widths of the fifth sidewall 74 and the third sidewall 71 of the corresponding top positioning wedge 7 located within the corresponding through hole 81. Thus, when the top of the top positioning wedge 7 is inserted into the bottom of the through hole 81, the non-protruding part of the top positioning wedge 7 has room to move within the non-protruding part of the through hole 81, and the protruding part also has room to move within the protruding part of the through hole 81. When the upper parts of the two top positioning wedges 7 pass through the corresponding two second sidewalls 312 and the fixing plate and are inserted into the corresponding through holes 81, the third sidewall 71, the pair of fifth sidewalls 74, and the sixth sidewall 75 of the two top positioning wedges 7 located within the corresponding through holes 81 abut against the third sidewall 71, the pair of fifth sidewalls 74, and the sixth sidewall 75 of the corresponding bottom positioning wedge 8, respectively. Figure 11 As shown, at this time, the part of the top positioning wedge 7 located in the corresponding through hole 81 is stuck in the corresponding through hole 81. Figure 11 The innermost filled part represents the top of the top positioning wedge 7, the structure composed of all the filled parts represents the top of the through hole 81, the structure enclosed by the dashed line represents the bottom of the part of the top positioning wedge 7 located inside the through hole 81, and the outermost solid line frame represents the bottom of the through hole 81.

[0066] like Figure 10 As shown, the rightmost sidewall of the top positioning wedge 7 is the third sidewall 71. In a clockwise direction, the sideswalls are: third sidewall 71, fourth sidewall 72, seventh sidewall 73, fifth sidewall 74, sixth sidewall 75, fifth sidewall 74, seventh sidewall 73, and fourth sidewall 72.

[0067] When hoisting the two upper concrete wall sections 1, positioning is achieved using their respective top positioning wedges 7 and bottom positioning wedges 8. During positioning, the top of the top positioning wedge 7 first passes through the bottom of the through hole 81. Because the top of the top positioning wedge 7 is smaller than the bottom of the through hole 81, it is advantageous for the top of the top positioning wedge 7 to pass through the bottom of the through hole 81. As the upper concrete wall section 1 is lowered, the distance between the third sidewall 71, the pair of fifth sidewalls 74, and the sixth sidewall 75 of the top positioning wedge 7 located within its corresponding through hole 81 and the third sidewall 71, the pair of fifth sidewalls 74, and the sixth sidewall 75 of its corresponding bottom positioning wedge 8 gradually decreases until the third sidewall 71, the pair of fifth sidewalls 74, and the sixth sidewall 75 of the top positioning wedge 7 located within its corresponding through hole 81 abuts against the third sidewall 71, the pair of fifth sidewalls 74, and the sixth sidewall 75 of its corresponding bottom positioning wedge 8.

[0068] Specifically, in the concrete modular building connection structure, the width of each connector 3 and each fixing plate is the same as the thickness of the concrete wall 1.

[0069] Construction method for concrete modular building connection structure, when concrete wall 1 has two parts, such as Figure 2 As shown, the construction methods include:

[0070] Set up two concrete walls 1 on the left and right, then connect the two bottom corner pieces 31 to the T-shaped connecting plate 2 respectively, then insert the I-shaped connector 12 into the two pairs of L-shaped connectors 9, and finally connect the two top corner pieces 31 to the T-shaped connecting plate 2 respectively.

[0071] When there are four concrete wall sections 1, such as Figure 9 As shown, the construction methods include:

[0072] Step 1: Set up the two lower concrete walls 1 on the left and right, and then connect the two corner pieces 31 at the bottom of the two lower concrete walls 1 to their corresponding fixing plates (T-shaped connecting plates 2).

[0073] Step 2: Insert an I-shaped connector 12 into the two pairs of L-shaped connectors 9 on the two concrete walls 1 of the lower layer;

[0074] Step 3: Install the cross-shaped connecting plate 10;

[0075] Step 4: Hoist the two upper concrete wall sections 1 separately. During hoisting, use the corresponding top positioning wedge 7 and bottom positioning wedge 8 for positioning.

[0076] Step 5: Connect the cross-shaped connecting plate 10 to its four corresponding corner pieces 31;

[0077] Step 6: Insert another I-shaped connector 12 into the two pairs of L-shaped connectors 9 on the two upper concrete walls 1, and then connect the two corner pieces 31 at the top of the two upper concrete walls 1 to their corresponding fixing plates (T-shaped connecting plates 2).

[0078] Figure 9 In this process, one image corresponds to one step. Figure 9 The structure where the two corner pieces 31 at the top and bottom are connected to the T-shaped connecting plate 2 is not shown in the diagram. This part of the structure is related to... Figure 2 The two corner pieces 31 at the top and bottom are connected to the T-shaped connecting plate 2 in the same way. In actual construction, if three or more layers of concrete wall 1 need to be set up, the construction method of the four adjacent concrete wall pieces 1 is the same as above, located at the top and bottom, and the connection method of the two adjacent corner pieces 31 and the T-shaped connecting plate 2 is the same as the connection method when there are two concrete wall pieces 1.

[0079] The construction sequence is as follows: binding of steel bars for factory walls, floors and roof slabs → fabrication of connector 3 → welding and fixing of connector 3 with horizontal bars 4, vertical bars 5 and studs 6 → installation and fixing of modular unit formwork → pouring concrete → demolding after concrete has reached strength → transporting modular units from the factory to the construction site → hoisting of lower-level modular units → installation of bottom connecting plates → embedding of I-shaped connector 12 into the slot between two pairs of L-shaped connectors 9 → placement of cross-shaped connecting plates 10 → hoisting of upper-level modular units → installation of high-strength bolts → installation of upper-level I-shaped connector 12 → installation of top connecting plates.

[0080] This invention's connector employs a bidirectional horizontal and vertical connection, significantly enhancing the collaborative stress-bearing rigidity of the walls between modular units compared to conventional unidirectional connections. The connector incorporates a positioning and limiting wedge and an L-shaped connector. The positioning and limiting wedge facilitates automatic and precise positioning during the hoisting and installation of modular units. Adjacent modular units are connected to the walls via L-shaped and I-shaped connectors to form a unified, collaborative load-bearing structure. The connector connects to the modular unit walls through horizontal and vertical reinforcement bars and studs within its area. Modular units are connected together via the connector, connecting plate, high-strength bolts, and I-shaped connectors to share the load. The concrete modular building connector proposed in this invention offers reliable load-bearing capacity, ease of manufacturing, automatic and precise positioning and limiting, enhanced collaborative stress-bearing between modular units, and on-site bolted connections, greatly improving on-site installation efficiency and project quality.

[0081] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A concrete modular building connection structure for connecting two or four concrete walls. When there are two concrete walls, the two concrete walls are arranged side-by-side; when there are four concrete walls, one is arranged at each of the four concrete walls, one at the top, one at the bottom, one at the left, and one at the right. Its characteristic is that... The connection structure includes: Two or four connectors are provided, one connector is provided on each of any two left and right concrete walls, each connector includes a pair of corner pieces and a middle plate, each corner piece has a first side wall and a second side wall connected together, each first side wall and the second side wall connected to it are respectively provided along two adjacent sides on the corresponding concrete wall, each pair of corner pieces are provided at the upper and lower corners of the corresponding concrete wall, each middle plate is located between its corresponding pair of corner pieces, and its two ends are respectively fixedly connected to the first side wall of its corresponding pair of corner pieces, and any two left and right middle plates are detachably connected and are located between their corresponding two concrete walls; At least one fixing plate is provided between any two opposing first side walls and any two opposing second side walls, and each fixing plate is detachably connected to its corresponding two corner pieces. Each corner piece has a first sidewall and a second sidewall that are perpendicular to each other. When there are four concrete walls, the four middle fixing plates are connected to each other to form a cross-shaped connecting plate. A fixing plate is also installed at each of the second side walls at the top and bottom. The three fixing plates at the top and bottom are connected to each other and form T-shaped connecting plates. Each corner piece is an L-shaped piece that is hollow inside and open on the front and / or rear sides. Any two opposing first sidewalls and the fixing plate between them, as well as any two opposing second sidewalls and the fixing plate between them, are connected by first high-strength bolts. Each first high-strength bolt passes through its corresponding two first sidewalls and fixing plates, and two second sidewalls and fixing plates. The bolt head and nut of each first high-strength bolt are located inside the two corner pieces corresponding to them. Each second sidewall at the top and bottom and its corresponding fixing plate are connected by second high-strength bolts. Each second high-strength bolt passes through its corresponding second sidewall and fixing plate. Each second sidewall and its corresponding fixing plate are respectively locked between the bolt head and nut of its corresponding second high-strength bolt. Each intermediate plate has a pair of L-shaped connectors spaced apart. One end of each pair of L-shaped connectors is connected to the corresponding intermediate plate, and the other end is positioned opposite to it. An I-shaped connector is inserted into any two pairs of L-shaped connectors. Each I-shaped connector is connected to its corresponding two pairs of L-shaped connectors to form a cuboid. The top and bottom of each I-shaped connector abut against its corresponding two fixing plates.

2. The concrete modular building connection structure according to claim 1, characterized in that, Each connector is connected to the horizontal reinforcement bars, vertical reinforcement bars, and studs within the concrete wall.

3. The concrete modular building connection structure according to claim 1, characterized in that, When there are four concrete walls, the top of the two lower concrete walls is equipped with a top positioning wedge, and the bottom of the two upper concrete walls is equipped with a bottom positioning wedge. Each bottom positioning wedge has a through hole, and each top positioning wedge corresponds to one through hole. The lower parts of the two bottom positioning wedges and the two top positioning wedges are fixed in their corresponding corner pieces. The upper parts of the two top positioning wedges pass through their corresponding second sidewalls and fixing plates and are inserted into their corresponding through holes. The cross-sections of the portions of the two through holes and the top positioning wedges within their corresponding through holes are all convex. The protrusions of the left-side through hole and the left-side top positioning wedge face right, and the protrusions of the right-side through hole and the right-side top positioning wedge face left. The inner wall of each bottom positioning wedge and the outer wall of the portion of each top positioning wedge located in its corresponding through hole each include a third side wall, a pair of fourth side walls and a pair of fifth side walls perpendicular to the third side wall, a sixth side wall and a pair of seventh side walls parallel to the third side wall. The third side wall is adjacent to the pair of fourth side walls and is opposite to the middle of the sixth side wall. Each third side wall and the pair of fifth side walls gradually slope outward from its top to its bottom. The width of the fifth side wall and the third side wall of the two bottom positioning wedges is greater than the width of the fifth side wall and the third side wall of the portion of the top positioning wedge located in its corresponding through hole. The third side wall, the pair of fifth side walls and the sixth side wall of the portion of the top positioning wedge located in its corresponding through hole abut against the third side wall, the pair of fifth side walls and the sixth side wall of the bottom positioning wedge, respectively.

4. The concrete modular building connection structure according to claim 1, characterized in that, The width of each connector and each fixing plate is the same as the thickness of the concrete wall.

5. A construction method for a concrete modular building connection structure, employing the concrete modular building connection structure according to claim 3, characterized in that, When there are two concrete walls, the construction methods include: Set up the two concrete walls on the left and right, then connect the two bottom corner pieces to the T-shaped connecting plates respectively, then insert the I-shaped connectors into the two pairs of L-shaped connectors, and finally connect the two top corner pieces to the T-shaped connecting plates respectively. When there are four concrete walls, the construction methods include: Step 1: Position the two lower concrete walls to the left and right, then connect the two corner pieces at the bottom of the two lower concrete walls to their corresponding fixing plates. Step 2: Insert an I-shaped connector into the two pairs of L-shaped connectors on the two concrete walls of the lower layer; Step 3: Install the cross-shaped connecting plate; Step 4: Hoist the two upper concrete wall sections separately, using their respective top and bottom positioning wedges for positioning during hoisting. Step 5: Connect the cross-shaped connecting plate to its four corresponding corner pieces; Step 6: Insert another I-shaped connector into the two pairs of L-shaped connectors on the two upper concrete walls, and then connect the two corner pieces at the top of the two upper concrete walls to their corresponding fixing plates.

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