Concrete modular building rigid connection joint and construction method thereof

Abstract

The invention discloses a concrete modular building rigid connection joint and a construction method thereof.The rigid connection joint comprises a module superposed beam, a module column, a post-cast joint core area, a connecting steel bar, a forming hole channel and a fastener, and the connecting steel bar penetrates through the forming hole channel embedded in the module superposed beam and the module column in a penetrating mode to be connected with adjacent modules; concrete, ultra-high performance concrete or high-strength grouting materials are poured into the core area of the post-cast joint to form a whole. Compared with the prior art, by arranging the connecting steel bars and the post-cast joint core area, reliable transmission of the sagging moment of the beam-column joint is guaranteed, the shear bearing capacity of the joint is enhanced, rigid connection of the joint area is achieved, the force transmission path is clear, the structure is simple, and construction is convenient and fast. According to the rigid connection joint, the problems that an existing module column semi-rigid connection joint is fuzzy in force transmission path and complex in connection are effectively solved, and the rigid connection joint has the performance and construction advantages.

Description

Technical Field

[0001] The invention belongs to the technical field of construction, relates to modular buildings, and particularly relates to a rigid connection node of a concrete modular building and a construction method thereof. Background Art

[0002] As a new form of construction, concrete modular construction achieves standardization, efficiency and environmental protection of the construction process by precisely manufacturing prefabricated concrete modules in factories and then quickly assembling them on site. Compared with steel structure modules, it has outstanding cost advantages and has broad application prospects in residential, commercial, public facilities and other fields.

[0003] The connection between adjacent module column nodes is a key technology in concrete modular buildings. Existing technologies use technical means such as steel connectors, energy dissipation devices, and prestressing to ensure the force transmission performance of the node area and enhance the ductility of the node. However, there are generally problems such as complex node structure and cumbersome construction process. In addition, most of them are semi-rigid connections with complex force performance, which greatly increases the design difficulty.

[0004] Therefore, how to simplify the node structure, achieve rigid connection between adjacent module columns, improve construction efficiency, and simplify the design method to ensure a more reliable connection in the node area is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a concrete modular building connection node and a construction method thereof, so as to solve the problems of the existing connection node having complex structure, unclear force transmission path, and cumbersome design method.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A rigid connection node of a concrete modular building comprises a first modular composite beam, a second modular composite beam, a modular column, a post-cast node core area, a connecting steel rod, a forming channel and fasteners, wherein the first modular composite beam is parallel to the connection direction of the modular column, and comprises a first prefabricated beam body, a prefabricated axil area and a post-cast overlapping layer; the second modular composite beam is perpendicular to the connection direction of the modular column, and comprises a second prefabricated beam body and a post-cast overlapping part; a groove is provided on the top of the modular column, and the grooves of adjacent modular columns are butt-jointed as a whole, and post-casting is performed in the grooves of adjacent modular columns and in the gaps therebetween to form a post-cast node core area; the forming channel is pre-buried through and at the same horizontal height position of the prefabricated axil area and the modular column; the connecting steel rod passes through the forming channel to connect the adjacent modular columns, and is fixed to the side surface of the modular column away from the post-cast node core area by fasteners; the top reinforcement of the first adjacent modular composite beam is arranged through the post-cast node core area.

[0008] In one embodiment, the post-cast composite layer is located at the top of the prefabricated beam body, and the top reinforcement runs through the module composite beam along the length direction; the prefabricated armpit area is located at both ends of the bottom of the prefabricated beam body, and the stirrups of the module composite beam are distributed therein.

[0009] In one embodiment, the post-cast overlapping part is located at the top of the precast beam body 2 and together with the precast beam body 2 forms a rectangular cross-section. The top reinforcement 2 runs through the module composite beam 2 along the length direction and extends into the top of the core area of ​​the post-cast node.

[0010] In one embodiment, ordinary concrete, ultra-high performance concrete or high-strength grouting material is poured into the core area of ​​the post-cast node to ensure the effective transfer of compressive stress in the core area of ​​the node; the interface between the core area of ​​the post-cast node and the groove side of the module column is a natural formed surface, a rough surface or a keyway; the post-cast overlapping layer of the module composite beam one and the post-cast overlapping part of the module composite beam two are cast with ordinary concrete.

[0011] In one embodiment, the forming channel is reliably fixed to the prefabricated steel cage of the armpit area, and the forming channel extends through the steel cage of the module column, and its end close to the core area of ​​the post-cast node is flush with the side surface of the module column.

[0012] In one embodiment, in order to prevent local pressure damage, a reinforcing end plate is embedded in the side of the prefabricated armpit area away from the core area of ​​the post-cast node, the reinforcing end plate is reliably fixed to the forming channel, and the connecting steel rod is fixed to the side of the reinforcing end plate away from the core area of ​​the post-cast node by fasteners.

[0013] In one embodiment, the module top composed of the module composite beam 1, the module composite beam 2 and the module column is simultaneously prefabricated as an integral floor slab, or is laid on site.

[0014] In one embodiment, in order to enhance the shear resistance of the node, one or two shear steel plates are arranged between adjacent module columns, and the shear steel plates are welded to the embedded steel plates on the sides of the module columns through fillet welds.

[0015] The present invention also provides a construction method for the rigid connection node of the concrete modular building, comprising the following steps:

[0016] Step 1: Complete the binding of the prefabricated beam body 1 of the module composite beam 1, the prefabricated beam body 2 of the module composite beam 2 and the steel cage of the module column in the factory, and fix the formed channel on the prefabricated beam body 1 and the steel cage of the module column;

[0017] Step 2, completing the casting of the precast beam body 1, the precast beam body 2 and the module column in the factory formwork to form an integral module;

[0018] Step 3, after the prefabricated modules are positioned and hoisted into place at the construction site, the connecting steel rods are passed through the formed channels at the same horizontal height of the adjacent prefabricated modules, and the connecting steel rods are fixed with fasteners;

[0019] Step 4: Use a caulking agent or a cover plate to seal the gaps between adjacent module columns and adjacent module composite beams to prevent leakage;

[0020] Step 5, after penetrating the top reinforcement 1 of the module composite beam 1 and the top reinforcement 2 of the module composite beam 2, pour the concrete of the post-cast composite layer and the post-cast composite part. When ordinary concrete is used for the core area of ​​the post-cast node, it is poured at the same time as the post-cast composite layer and the post-cast composite part. When high-strength grouting material or ultra-high performance concrete is used for the core area of ​​the post-cast node, the core area of ​​the post-cast node is poured first, and then the post-cast composite layer and the post-cast composite part are poured.

[0021] In one embodiment, when the shear steel plate is provided, the embedded steel plate is fixed to the steel cage of the module column in step 1; and the shear steel plate is welded to the embedded steel plate of the adjacent module column in step 3.

[0022] Compared with the prior art, the present invention can effectively transfer the tensile and compressive stresses in the node area by setting connecting steel bars, and effectively transfer the compressive stress in the node area through the post-cast node core area, and together with the through top reinforcement, realize the transmission of positive and negative bending moments in the node area, thereby realizing the rigid connection of the module column node.

[0023] The present invention also adds a shear steel plate to further improve the shear bearing capacity of the node. At the same time, the shear steel plate deforms and dissipates energy under rare earthquakes, thereby enhancing the seismic performance of the node.

[0024] The node component of the present invention is simple, the force transmission path is clear, and the construction is convenient, which solves the application pain points of the existing concrete modular semi-rigid connection nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the rigid connection node of the modular building of the present invention.

[0026] Figure 2 It is a three-dimensional schematic diagram of a modular composite beam 1 in an embodiment of the present invention.

[0027] Figure 3 It is a three-dimensional schematic diagram of the second modular composite beam in an embodiment of the present invention.

[0028] Figure 4 It is a three-dimensional schematic diagram of the node core area range in an embodiment of the present invention.

[0029] Figure 5 It is a three-dimensional schematic diagram of a module column in an embodiment of the present invention.

[0030] Figure 6 It is a three-dimensional schematic diagram of the integral fixing of the reinforcing end plate and the forming channel in one embodiment of the present invention.

[0031] Figure 7 It is a three-dimensional schematic diagram of the arrangement of modular columns and shear steel plates in one embodiment of the present invention.

[0032] Figure 8 It is a three-dimensional schematic diagram of the arrangement of modular columns and shear steel plates in another embodiment of the present invention.

[0033] In the figure:

[0034] 1-module composite beam one; 11-precast beam body one; 12-precast armpit area; 13-post-cast composite layer; 131-top reinforcement one; 2-module composite beam two; 21-precast beam body two; 22-post-cast composite part; 221-top reinforcement two; 3-module column; 31-groove; 32-embedded steel plate; 4-post-cast node core area; 5-connecting steel rod; 6-molding channel; 7-fastener; 8-reinforced end plate; 9-shear steel plate. DETAILED DESCRIPTION

[0035] The specific technical solutions of the present invention are described below in conjunction with embodiments.

[0036] The rigid connection node of concrete modular building of the present invention aims to realize the rigid connection of concrete module columns through the integrally cast node core area and the connection steel rod and other structures, clarify the force transmission path, improve the structural safety, and simplify the design method. Figure 1 As shown, it includes a module composite beam 1, a module composite beam 2, a module column 3, a post-cast node core area 4, a connecting steel rod 5, a forming channel 6 and a fastener 7. The module composite beam 1 is parallel to the connection direction of the module column 3, and includes a prefabricated beam body 11, a prefabricated armpit area 12 and a post-cast composite layer 13; the module composite beam 2 is perpendicular to the connection direction of the module column 3, and includes a prefabricated beam body 21 and a post-cast composite part 22. A groove 31 is provided on the top of the module column 3, and the grooves 31 of adjacent module columns 3 are butted as a whole, and post-casting is performed in the grooves 31 of adjacent module columns 3 and in the gaps therebetween to form a post-cast node core area 4; the forming channel 6 is pre-buried in the prefabricated armpit area 12 and the same horizontal height position as the module column 3; the connecting steel rod 5 passes through the forming channel 6 to connect the adjacent module columns 3, and is fixed to the side surface of the module column 3 away from the post-cast node core area 4 by fasteners 7; the top reinforcement 131 of the adjacent module composite beam 1 passes through the post-cast node core area 4.

[0037] refer to Figure 2As shown, in this structure, the post-cast composite layer 13 is located at the top of the precast beam body 11, and the top reinforcement 131 runs through the module composite beam 1 along the length direction thereof, and the top reinforcement 131 of the adjacent module composite beam 1 runs through the top of the post-cast node core area 4; in order to enhance the anchoring, an anchor plate is provided at one end of the precast beam body 11 where the bottom reinforcement extends into the post-cast node core area 4; the precast axil area 12 is located at both ends of the bottom of the precast beam body 11, and stirrups of the module composite beam 1 are distributed therein, and the forming channel 6 is pre-embedded and located inside the stirrups, and the stirrups can constrain the concrete of the precast axil area 12, enhance its ductility, and prevent splitting damage; the precast beam body 11 and the precast axil area 12 are integrally cast and formed in the factory.

[0038] refer to Figure 3 As shown, in this structure, the post-cast overlapped part 22 is located at the top of the precast beam body 21, and together with the precast beam body 21, forms a rectangular cross section, and the top reinforcement 221 runs through the module composite beam 2 along the length direction thereof, and extends into the top of the post-cast node core area 4. To enhance anchoring, an anchor plate may be provided at the end of the top reinforcement 221 extending into the post-cast node core area 4. In some embodiments of the present invention, there is a joint between adjacent module composite beams 2, which is usually no more than 2 cm.

[0039] In this structure, taking into comprehensive consideration the stress performance and construction cost, the post-cast overlapping layer 13 of the modular composite beam 1 and the post-cast overlapping part 22 of the modular composite beam 2 are both cast with ordinary concrete. When the post-cast node core area 4 is cast with ultra-high performance concrete or high-strength grouting material, the post-cast node core area 4 should be cast first, and after the core area casting material reaches the design strength, the ordinary concrete of the modular composite beam should be cast.

[0040] In this structure, the gap between the grooves 31 of adjacent module columns 3 is the same width as the installation gap of adjacent module columns 3, which is usually no more than 2 cm.

[0041] Figure 4 A three-dimensional schematic diagram of the core area of ​​the node in an embodiment of the present invention is given. As shown in the figure, the scope of the post-cast node core area 4 includes the grooves 31 of adjacent module columns 3 and the gaps therebetween. Different materials can be selected for casting according to actual engineering needs, including ordinary concrete, ultra-high performance concrete or high-strength grouting materials, etc., to ensure the effective transmission of compressive stress in the core area of ​​the node.

[0042] In this structure, considering the transmission of shear force at the beam end in the core area of ​​the node, in order to enhance the interface shear bearing capacity between the post-cast node core area 4 and the prefabricated module column 3, the interface where the post-cast node core area 4 intersects with the side of the groove 31 of the module column 3 is preferably a rough surface or a keyway, and a naturally formed surface may also be used.

[0043] In this structure, the formed channel 6 extends through and into the steel cage 3 of the module column, and the end portion thereof not connected to the reinforcing end plate 8 is flush with the side surface of the module column 3 .

[0044] In some embodiments of the present invention, in order to prevent local pressure damage to the concrete of the precast axil area 12, a reinforcing end plate 8 is embedded in the side of the precast axil area away from the core area 4 of the post-cast node, and the reinforcing end plate 8 is reliably fixed to the formed channel 6. The connecting steel rod 5 is fixed to the side of the reinforcing end plate 8 away from the core area 4 of the post-cast node through a fastener 7. The reinforcing end plate 8 can be made of ordinary carbon steel or stainless steel. To facilitate the positioning of the channel, the formed channel 6 and the reinforcing end plate 8 can be effectively fixed together in advance. Figure 6 As shown, it is then pre-buried in the prefabricated armpit area 12 and the module column 3. The formed channel can be made of weldable thin-walled metal pipes, plastic pipes or core-pulling holes.

[0045] In some embodiments of the present invention, the top surface of the concrete module can be constructed in different ways, such as using a prefabricated floor slab 9 to be prefabricated in a factory at the same time as the module top composed of the module composite beam 1, the module composite beam 2 and the module column 3, or laying a formwork-free floor slab or supporting a floor formwork on site, and then pouring the floor concrete.

[0046] In this structure, in order to enhance the shear resistance of the node, one or two shear steel plates 9 are arranged between adjacent module columns 3. The shear steel plates 9 are welded to the embedded steel plates 32 on the sides of the module columns 3 through fillet welds. The shear force between the module columns can be transmitted through the shear steel plates 9. Under the action of rare earthquakes, the shear steel plates 9 deform and dissipate energy, thereby enhancing the ductility and energy dissipation capacity of the node area. Figure 7 As shown, when the shear steel plate 9 is arranged on the side of the column away from the module composite beam 2, it is arranged at the same level as the core area 4 of the post-cast node. Figure 8 As shown, when the shear steel plate 9 is arranged on the side of the column close to the module composite beam 2, it is arranged below the core area 4 of the post-cast node.

[0047] The present invention further provides a construction method for rigid connection nodes of concrete modular buildings, which is implemented based on modular construction technology to improve construction efficiency and effectively control quality and cost. Specifically, the construction method includes the following steps:

[0048] Step 1, complete the binding of the precast beam body 11 of the module composite beam 1, the precast beam body 21 of the module composite beam 2 and the steel cage of the module column 3 in the factory, and fix the formed channel 6 to the precast beam body 11 and the steel cage of the module column 3.

[0049] This step is the basis of the entire construction process. Before starting to tie, it is necessary to ensure that all steel materials meet the design requirements, including the specifications, quantity and strength grade of the steel bars. The surface of the steel bars should be clean and free from rust and pollution to ensure a good connection. The design of the steel cage should take into account the bearing capacity and seismic performance to ensure its strength and stability after concrete pouring. The fixing of the formed channel 6 should ensure that its position is accurate so that it can pass through the connecting steel rod 5 smoothly during subsequent construction.

[0050] Step 2, complete the casting of the precast beam body 1 11, the precast beam body 2 21 and the module column 3 in the factory formwork to form an integral module.

[0051] The main purpose of this step is to pour the precast modules. During the process, attention should be paid to controlling the fluidity of the concrete to avoid segregation and bubbles. After pouring, the concrete is vibrated with a vibrator to eliminate bubbles and improve density. After pouring, the concrete should be properly cured and kept moist to prevent cracking and insufficient strength.

[0052] Through the above steps 1 and 2, the prefabrication part of the project is completed.

[0053] Step 3, after the prefabricated modules are positioned and hoisted into place at the construction site, the connecting steel rods 5 are passed through the forming channels 6 at the same horizontal height of the adjacent prefabricated modules, and the connecting steel rods 5 are fixed with fasteners 7.

[0054] This step completes the on-site positioning and hoisting, wherein the fasteners 7 can be bolts or the like, and the fixing method thereof can be, for example, bolt connection, to ensure a firm connection between the modules and enhance the stability of the overall structure.

[0055] Step 4, using a caulking agent or a cover plate to seal the gaps between adjacent module columns 3 and adjacent module composite beams 2 to prevent leakage.

[0056] The main purpose of this step is to seal the gap. After the modules are connected, select appropriate caulking agent to fill the gap according to the size of the gap and design requirements, or use a cover plate to cover it to prevent leakage and water penetration. The use of caulking agent should ensure the sealing of the gap to prevent water seepage or structural loosening during subsequent construction or use.

[0057] Step 5, after installing the top reinforcement 131 of the module composite beam 1 and the top reinforcement 221 of the module composite beam 2, pour the concrete of the post-cast composite layer 13 and the post-cast composite part 22. When the post-cast node core area 4 is made of ordinary concrete, pour it at the same time as the post-cast composite layer 13 and the post-cast composite part 22. When the post-cast node core area 4 is cast with high-strength grouting material or high-strength concrete, pour the post-cast node core area first, and then pour the post-cast composite layer 13 and the post-cast composite part 22 concrete.

[0058] The main purpose of this step is to pour the post-cast concrete. First, two top bars are inserted to ensure the firmness of the connection, and then the concrete is poured. After the pouring is completed, proper curing is carried out to ensure the strength and stability of the concrete.

[0059] In some embodiments of the present invention, when the shear steel plate 9 is provided, the embedded steel plate 32 is fixed to the steel cage of the module column 3 in step 1; and the shear steel plate 9 is welded to the embedded steel plate 32 of the adjacent module column 3 in step 3.

[0060] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes and substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. Concrete modular building rigid connection node, characterized in that, The invention comprises a modular composite beam (1), a modular composite beam (2), a modular column (3), a post-cast node core area (4), a connecting steel rod (5), a forming channel (6) and a fastener (7); the modular composite beam (1) is parallel to the connection direction of the modular column (3), and comprises a prefabricated beam body (11), a prefabricated armpit area (12) and a post-cast composite layer (13); the modular composite beam (2) is perpendicular to the connection direction of the modular column (3), and comprises a prefabricated beam body (21) and a post-cast composite part (22); the top of the modular column (3) is provided with a groove (31), and adjacent modular columns (3) are provided with grooves (31). The grooves (31) of the adjacent module columns (3) are butt-jointed to form a whole, and post-casting is performed in the grooves (31) of the adjacent module columns (3) and in the gaps therebetween to form a post-cast node core area (4); the forming channel (6) is pre-buried in the prefabricated armpit area (12) and the module column (3) at the same horizontal height; the connecting steel rod (5) passes through the forming channel (6) to connect the adjacent module columns (3), and is fixed to the side surface of the module column (3) away from the post-cast node core area (4) by means of a fastener (7); the top reinforcement (131) of the adjacent module composite beam (1) passes through the post-cast node core area (4) and is arranged.

2. The rigid connection node of concrete modular building according to claim 1, characterized in that: The post-cast composite layer (13) is located on the top of the prefabricated beam body (11), and the top reinforcement (131) runs through the module composite beam (1) along the length direction; The prefabricated haunch area (12) is located at both ends of the bottom of the prefabricated beam body (11), and stirrups of the modular composite beam (1) are distributed therein.

3. The rigid connection node of concrete modular building according to claim 1, characterized in that: The post-cast overlapping part (22) is located at the top of the second precast beam body (21) and together with the second precast beam body (21) forms a rectangular cross-section. The second top reinforcement (221) runs through the second module composite beam (2) along the length direction thereof and extends into the top of the post-cast node core area (4).

4. The rigid connection node of concrete modular building according to claim 1, characterized in that: Ordinary concrete, ultra-high performance concrete or high-strength grouting material is poured into the post-cast node core area (4) to ensure the effective transmission of compressive stress in the node core area; the interface between the post-cast node core area (4) and the side of the groove (31) of the module column (3) is a natural molding surface, a rough surface or a keyway; the post-cast superimposed layer (13) of the module superimposed beam 1 (1) and the post-cast superimposed part (22) of the module superimposed beam 2 (2) are cast using ordinary concrete.

5. The rigid connection node of concrete modular building according to claim 1, characterized in that: The formed channel (6) is reliably fixed to the steel cage of the prefabricated armpit area (12), and the formed channel (6) extends through the steel cage of the module column (3), and its end close to the post-cast node core area (4) is flush with the side surface of the module column (3).

6. The rigid connection node of concrete modular building according to claim 1, characterized in that: In order to prevent local pressure damage, a reinforcing end plate (8) is embedded in the side of the prefabricated armpit area (12) away from the core area (4) of the post-cast node, the reinforcing end plate (8) is reliably fixed to the forming channel (6), and the connecting steel rod (5) is fixed to the side of the reinforcing end plate (8) away from the core area (4) of the post-cast node by means of a fastener (7).

7. The rigid connection node of concrete modular building according to claim 1, characterized in that: The module top composed of the module composite beam 1 (1), the module composite beam 2 (2) and the module column (3) is simultaneously prefabricated as a whole as a floor slab, or is laid on site.

8. The rigid connection node for concrete modular buildings according to claim 1, characterized in that: In order to enhance the shear resistance of the node, one or two shear resistant steel plates (9) are arranged between adjacent module columns (3), and the shear resistant steel plates (9) are welded to the embedded steel plates (32) on the sides of the module columns (3) through fillet welds.

9. The construction method of the rigid connection node of a concrete modular building according to any one of claims 1 to 8, characterized in that: The steps include: Step 1, completing the binding of the precast beam body 1 (11) of the modular composite beam 1 (1), the precast beam body 2 (21) of the modular composite beam 2 (2) and the steel cage of the modular column (3) in the factory, and fixing the formed channel (6) on the precast beam body 1 (11) and the steel cage of the modular column (3); Step 2, completing the casting of the precast beam body 1 (11), the precast beam body 2 (21) and the module column (3) in the factory formwork to form an integral module; Step 3, after the prefabricated modules are positioned and hoisted into place at the construction site, the connecting steel rods (5) are passed through the forming channels (6) at the same level of the adjacent prefabricated modules, and the connecting steel rods (5) are fixed with fasteners (7); Step 4, using a caulking agent or a cover plate to seal the gaps between adjacent module columns (3) and adjacent module composite beams (2) to prevent leakage; Step 5, after the top reinforcement 1 (131) of the module composite beam 1 (1) and the top reinforcement 2 (221) of the module composite beam 2 (2) are penetrated, the concrete of the post-cast composite layer (13) and the post-cast composite part (22) is poured. When the post-cast node core area (4) is made of ordinary concrete, it is poured at the same time as the post-cast composite layer (13) and the post-cast composite part (22). When the post-cast node core area (4) is poured with high-strength grouting material or ultra-high performance concrete, the post-cast node core area is poured first, and then the post-cast composite layer (13) and the post-cast composite part (22) concrete are poured.

10. The method for constructing rigid connection nodes of concrete modular buildings according to claim 8, characterized in that: When the shear-resistant steel plate (9) is provided, in step 1, the embedded steel plate (32) is fixed to the steel cage of the module column (3); and in step 3, the shear-resistant steel plate (9) is welded to the embedded steel plate (32) of the adjacent module column (3).

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