A web-opening steel connecting piece and wall connecting piece

Abstract

This invention discloses a perforated steel connector and a wall connector for post-cast connections in the joint area of ​​modular concrete buildings. The connector is a long strip-shaped metal component, including a web and flanges forming guide surfaces at both ends of the web. The main cross-section adopts a cross-sectional shape where the flanges can be integrally inserted into and accommodated in the slots of a groove-shaped fastener. Through holes are regularly spaced along the length of the web. The groove-shaped fasteners are hung and fixed in pairs to the joint area of ​​the precast concrete module. The flanges at both ends of the steel connector are inserted into the groove-shaped fasteners. Post-cast concrete fills the groove-shaped fasteners and the through holes passing through the steel connectors, forming an integral connection node in the joint area. This invention addresses the shortcomings of the joint area, where the stress performance differs significantly from that of cast-in-place structures, the force transmission path is discontinuous, and interface slippage easily occurs under shear loads.

Description

Technical Field

[0001] This application relates to the field of modular prefabricated building technology, and in particular to a web-perforated steel connector and a wall connector using the same. Background Technology

[0002] With the continuous improvement of the level of industrialization in the construction industry, prefabricated concrete buildings have been widely used in residential and public buildings due to their advantages such as high construction efficiency and controllable quality. In prefabricated modular concrete buildings, precast concrete modules serve as the main structural units, and the connection performance between these modules directly affects the stiffness, seismic performance, and construction efficiency of the overall structure.

[0003] Existing connection methods between prefabricated concrete building modules mainly include welding, bolting, and grouting with pre-reinforced steel sleeves. For example, existing high-efficiency precast concrete modular buildings use precast concrete modules assembled into a whole building. Cavities are formed between modules at the shear wall assembly points, where large-diameter longitudinal reinforcement bars are directly connected and locally restrained by stirrups. Concrete is then poured into the cavities to form connection nodes. However, in this approach, reinforcement connections mainly rely on on-site binding and welding, resulting in a large amount of on-site work. The connection quality is significantly affected by the skill level of the construction workers, and the welding requires a long cooling and curing time, leading to extended construction periods.

[0004] Some modular integrated concrete building connection systems also feature reserved post-cast areas at the joints of adjacent box-type components. These systems include slots on the precast top slab where reinforcing bars are lapped before concrete is poured; U-shaped slots within precast beams for lapped reinforcing bars; and vertical slots in precast shear walls for connecting reinforcement. While this approach achieves rebar lapping through reserved slots, it still requires extensive on-site rebar tying after the modules are hoisted into place. Furthermore, the lack of effective sealing measures in the post-cast concrete areas makes it prone to cement slurry leakage from the joints during pouring, resulting in honeycomb-like pitted surfaces and requiring secondary repairs, thus increasing the construction steps.

[0005] Furthermore, while existing bolted connections are convenient to install, their load-bearing capacity at the joints differs significantly from that of cast-in-place structures. Under shear loads, interface slippage is prone to occur, affecting the overall structural integrity. The grouting connection method using pre-reinforced steel sleeves relies solely on the bond force between the grout and the steel reinforcement within the sleeve to transfer loads. The joints lack a continuous load-bearing framework, resulting in discontinuous force transmission paths and limited shear capacity.

[0006] Therefore, there is a need for a modular concrete building connection structure and construction method that can achieve rapid and standardized connections, form an integral connection node at the joint equivalent to the cast-in-place structure, and effectively prevent leakage of post-cast concrete grout. Summary of the Invention

[0007] The purpose of this invention is to provide a web-perforated steel connector and a wall connector using the same, in order to solve the following technical problems existing in the prior art: (1) The stress performance of the joints in the prior art is significantly different from that of the cast-in-place structure. The force transmission path is discontinuous, and interface slippage is prone to occur under shear load, resulting in insufficient structural integrity. (2) In the existing connection method, after the module is hoisted into place, a large amount of on-site steel bar binding and welding work is required, and there is a lack of standardized positioning structure, resulting in poor positioning accuracy; (3) In the existing technology, there is a lack of effective sealing measures in the post-cast concrete area. During the pouring process, cement slurry is prone to seep from the joint side, causing honeycomb pitting on the joint surface, which requires secondary repair. (4) Existing prefabricated concrete building modules are connected by welding, bolting or grouting with pre-reserved steel sleeves. This involves a large amount of on-site work, the connection quality is significantly affected by the technical level of the construction personnel, and the construction period is long.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A type of steel connector with open web is used for post-cast connection in the joint area of ​​modular concrete buildings. The connector is a long strip metal component, including a web and flanges that form guide surfaces at both ends of the web. The main cross-section adopts a cross-sectional form in which the flange can be inserted into and accommodated as a whole into the slot of the slotted fastener. Through holes are regularly spaced along the long strip in the web area.

[0009] The guide surface facilitates the insertion of grooved fasteners into the factory after prefabrication, avoiding extensive manual operations such as welding, bolting, and grouting of pre-reinforced steel sleeves during modular building installation. Through holes are provided on the web of the steel connector; the poured concrete passes through these holes and hardens to form concrete pins, achieving a reliable connection between the steel connector and the poured concrete, creating a continuous force transmission path at the joint.

[0010] Furthermore, the cross-sectional shape is one of I-shaped, C-shaped, or Z-shaped.

[0011] Furthermore, when the web-perforated steel connector is inserted into the opening slot, at least a portion of its flange contacts the surface of the slot-shaped fixing member.

[0012] Furthermore, the perforated steel connectors in the web are joined together vertically along the length to form a continuous connection structure.

[0013] Furthermore, the web is a flat plate region perpendicular to the flange.

[0014] Furthermore, the total area of ​​the through holes in the web accounts for 20%-50% of the web area. This is to maximize the contact and interlocking area between the web and the subsequent concrete while ensuring the necessary shear strength of the web.

[0015] Furthermore, the shapes of the through holes in the web include, but are not limited to, circular, elliptical, oblong, rhomboid, or square. These are all common hole shapes, easy to process and manufacture, and allow the poured concrete to pass smoothly through these holes to form concrete dowels, achieving reliable force transmission.

[0016] Furthermore, the arrangement of the web through holes can be a single row in a straight line, or a double row or multiple rows in an alternating arrangement.

[0017] Furthermore, mounting holes are provided on the flange for temporary bolt connections.

[0018] Furthermore, the top of the web of each perforated steel connector extends upward to form an inclined plate. The inclined plate surface forms a small angle (e.g., 5-30 degrees) with the web plate surface and is then connected to an overlapping plate parallel to the web. The width of the inclined plate and the overlapping plate is smaller than the width of the connector's web.

[0019] Furthermore, after the web-plate perforated steel connector is inserted into the slot of the channel-shaped fastener, the inclined plate and the overlapping plate extend out from the slot of the bottom channel-shaped fastener.

[0020] Furthermore, when two adjacent perforated steel connectors are joined together, the lower lap plate overlaps with the upper web plate, and the lap plate surfaces contact each other to form a positioning.

[0021] Furthermore, the connector is inserted from above into the opening cavity of two opposing slotted fasteners to form an integral connection node for post-pouring in the joint area.

[0022] In the joint, the through hole in the web of the connector forms a concrete dowel structure with the concrete, which strengthens the connection.

[0023] Furthermore, the channel-shaped fastener is a flat channel steel with an open slot, including an envelope portion connecting the web and both sides. An opening slightly wider than the web thickness of the web opening steel connector is left between the two ends of the envelope portion, forming an unclosed cavity that accommodates one end flange.

[0024] Furthermore, each end of the groove edge of the slotted fastener has a U-shaped elastic sealing member, which is used to contact the web-perforated steel connector to seal the opening of the slotted fastener.

[0025] The sealing component is set at the edge of the groove of the groove-shaped fastener. It is deformed under pressure during module assembly, effectively sealing the cavity of the cast groove-shaped fastener and preventing lateral leakage of cement slurry.

[0026] Concrete is poured between the two modules after their respective fixed foundations are constructed, forming an integrated connection node. The fixed foundation is generally the joint area of ​​the two precast concrete modules. The grooved fastener is fixed to the concrete wall or steel mesh of the joint area, with the opening of the groove facing away from the wall; or at least part of it is pre-embedded in the concrete wall of the joint area, with the opening facing the joint area.

[0027] Furthermore, multiple perforated steel connectors are laid vertically at intervals, with transverse steel mesh laid between adjacent channel-shaped fasteners. This enhances the bonding and crack resistance of the joint area, and, together with the post-poured concrete, makes the stress performance at the joint approach that of a cast-in-place structure.

[0028] Based on this, the present invention provides a modular concrete building wall connector, comprising: A grooved fastener is fixed to the edge of the joint area of ​​the precast concrete module and located outside the concrete joint wall of the module. The opening of the grooved fastener faces the joint side, and the back is set close to the wall; it is used to insert the web plate perforated steel connector.

[0029] The interior of the channel-shaped fastener and the joint area are filled with post-poured concrete, forming an integral connection node in the joint area. The post-poured concrete is used to fill the through holes of the channel-shaped fastener and the steel connector.

[0030] By installing fixed groove-shaped fasteners on the concrete wall outside the joint edge area of ​​the precast concrete modules, the positioning and fixing of the groove-shaped fasteners are completed in the factory prefabrication stage. The groove opening of the groove-shaped fastener faces the outside of the joint side and is set away from the wall, providing a standardized insertion channel for the insertion of steel connectors.

[0031] Furthermore, each connector's web plate extends upward to form an inclined plate, which forms a small angle (e.g., 5-30 degrees) with respect to the web plate surface. This allows adjacent connectors to be positioned by aligning their web plates vertically, with the bottom surface of the upper web plate contacting the inclined plate surface.

[0032] Furthermore, an elastic sealing member can be provided at the edge of the groove of the groove-shaped fastener to seal the groove of the groove-shaped fastener by making a sealing contact with the steel connecting member.

[0033] Furthermore, the channel-shaped fastener is a channel steel. Channel steel is a standardized channel-shaped fastener with a regular groove shape, which facilitates factory prefabrication and on-site assembly, and the groove structure can provide stable guidance and positioning for the insertion of the steel connector.

[0034] Furthermore, the steel connectors are I-beams, C-beams, or Z-beams. I-beams, C-beams, and Z-beams are all standardized steel section forms with good bending and shear resistance. I-beams are suitable for vertical joint connections under high stress, while C-beams and Z-beams are suitable for horizontal joints or areas under lower stress. By selecting different types of steel connectors, joint connection requirements with varying stress levels can be met.

[0035] Furthermore, the sealing component is a sealing strip. The sealing strip is made of elastic material, which has good sealing performance and deformation recovery ability. During module assembly, it can tightly fit the groove edge of the groove-shaped fastener through pressure deformation, effectively preventing cement grout leakage. At the same time, it can also absorb minor displacements and vibrations during module installation, improving the durability of the connection node.

[0036] Furthermore, the channel-shaped fasteners are vertically arranged on the sides of the precast concrete modules. This vertical arrangement of the channel-shaped fasteners is suitable for connecting vertical joints of adjacent precast concrete modules on the same floor. Through the vertically arranged channel-shaped fasteners and steel connectors, vertical and horizontal loads can be effectively transferred, ensuring the overall stability of the structure.

[0037] Furthermore, it also includes a transverse steel mesh, which is laid between adjacent channel-shaped fasteners for hanging and fixing the channel-shaped fasteners.

[0038] Furthermore, the transverse reinforcing mesh is welded and fixed inside or bound to the channel-shaped fastener. Multiple transverse reinforcing meshes are arranged between multiple channel-shaped fasteners, enhancing the bonding effect between the transverse reinforcing meshes and the channel-shaped fasteners. This allows the reinforcing meshes to more effectively restrain the concrete in the joint area, improving the crack resistance and tensile strength at the joint.

[0039] This invention also provides a modular concrete building construction method, comprising the following steps: S1: A groove-shaped fastener is pre-embedded or hung at the edge of the precast concrete module joint, with the groove of the fastener facing the joint side. S2: The first precast concrete module is hoisted into place; S3: Hoist the second precast concrete module and align the slots of the two precast concrete modules with the slot-shaped fixing parts. S4: Insert the steel connector into the slot of the groove-shaped fixing member of the two precast concrete modules from above; S5: Lay a transverse steel mesh between the adjacent groove-shaped fixing members; S6: Pour post-cast concrete into the inner cavity and joint area of ​​the groove-shaped fastener. The post-cast concrete passes through the through hole of the steel connector and fills the entire groove-shaped cavity of the groove-shaped fastener. S7: Curing the post-poured concrete to form an integral connection node.

[0040] This construction method achieves rapid assembly and reliable connection of precast concrete modules through standardized process steps. Sealing components are installed and grooved fasteners are pre-embedded or hung during the factory prefabrication stage, reducing on-site work.

[0041] During on-site hoisting, the module is precisely positioned by aligning the slots of the slotted fasteners. The insertion of the steel connectors is simple and quick, requiring no welding or special tools.

[0042] The process of laying transverse steel mesh and pouring post-concrete is clearly defined, making quality control easy. The entire construction process is tightly integrated, significantly shortening the construction cycle.

[0043] The beneficial effects of this invention are as follows: (1) High construction efficiency: The steel connectors adopt a standardized plug-in installation method, which eliminates the need for on-site welding and sleeve grouting operations. The assembly time of a single connection node is greatly shortened, which significantly improves the construction efficiency of prefabricated buildings. (2) Reliable connection and good integrity: Through the combined action of the groove-type fastener, the steel connector and the post-cast concrete, a continuous force transmission path is formed at the joint. The post-cast concrete passes through the concrete dowel formed by the through hole, making the shear bearing capacity and overall performance of the joint close to that of the cast-in-place structure. (3) High positioning accuracy: The slot of the slotted fastener and the plug-in fit of the steel connector provide a precise positioning reference, the module alignment error is small, and the assembly quality is guaranteed. (4) Good sealing effect and excellent appearance quality: The sealing components effectively prevent the post-poured concrete grout from leaking from the joint side, ensuring the compactness of the concrete pouring, and the joint appearance has a high one-time forming qualification rate, reducing the secondary repair process. (5) Strong adaptability: The form of the steel connector is adjustable, which can be used for different stress requirements of vertical and horizontal joints, and has a wide range of applications; (6) Quality controllable: The main connecting components are prefabricated in the factory, the amount of on-site pouring is small, the construction quality is easy to control, and the quality of the connection nodes is stable and reliable. (7) Good durability: The sealing components not only play a sealing role, but also absorb the small displacements and vibrations during the module installation process, reduce stress concentration, and improve the durability of the connection nodes. Attached Figure Description

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is an overall structural diagram of the web-perforated steel connector according to an embodiment of the present invention.

[0045] Figure 2 This is a diagram showing the overall state of the two web-perforated steel connectors connected together in an embodiment of the present invention.

[0046] Figure 3 This is a partial view of the two web-perforated steel connectors in an embodiment of the present invention, showing their joint connection.

[0047] Figure 4 This is a schematic diagram of the groove-shaped fastener structure according to an embodiment of the present invention.

[0048] Figure 5 This is a schematic diagram of the connection structure after the channel-shaped fastener and the web-perforated steel connector are connected according to an embodiment of the present invention.

[0049] Figure 6 This is a partial schematic diagram of the connection between the groove-shaped fastener and the side wall of the joint area of ​​the modular concrete building module according to an embodiment of the present invention.

[0050] Figure 7 This is a schematic diagram of a web-perforated steel connector according to another embodiment of the present invention.

[0051] Figure 8 This is a schematic diagram of a web-perforated steel connector according to another embodiment of the present invention. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0053] The meanings of the markings in the attached diagram are as follows: 1-Precast concrete module, 2-Channel-shaped fastener, 21-Through hole, 3-Sealing strip, 5-Steel connector, 51-Through hole, 6-Transverse steel mesh, 7-Post-cast concrete.

[0054] Example 1 like Figures 1 to 3 As shown, a perforated steel connector 5 is used for connecting the side walls of two modular concrete building modules. The connector 5 is a long strip metal component, including a web and flanges at both ends of the web. The main cross-section adopts a specific cross-sectional shape and regularly opens holes in its web area, thereby realizing the dual functions of "mechanical insertion and positioning" and "concrete structure composite" with the channel steel 2 fixed on the modular concrete wall.

[0055] To facilitate factory prefabrication, multiple connectors of the same length, width, cross-section and material are usually selected and then cast in place to form an integral connection between the side walls of the two modules.

[0056] The main cross-section of connector 5 is preferably I-shaped. This cross-sectional shape provides good bidirectional bending stiffness and shear resistance, while also having a clear guiding surface for easy insertion into the corresponding pre-embedded channel steel. In the same type of vertically butt-jointed connection structure, the cross-sectional shape is consistent.

[0057] Flange 53: For I-sections, it has upper and lower, or inner and outer flanges, used to form surface contact when inserting pre-embedded channel steel, providing stable support and transmitting pressure. Mounting holes may be selectively provided on the flanges for temporary bolt connections.

[0058] Web 52: The web 52 of the connector is a flat plate area perpendicular to the flange 53. The core improvement of this invention is that multiple through holes 51 are regularly formed on the web 52 along the length direction of the connector.

[0059] The shape of the openings in the web includes, but is not limited to, circular, elliptical, oblong, rhomboid, or square. Their arrangement can be a single row in a straight line, double rows, or multiple rows in an alternating pattern. The total area of ​​the openings accounts for 20%-50% of the web area, in order to maximize the contact and interlocking area with the subsequently poured concrete while ensuring the necessary shear strength of the web.

[0060] Each connector web 52 extends upward from its top to form an inclined plate 54. The inclined plate 54 forms a small angle (e.g., 5-30 degrees) with the web 52 and is connected to an overlapping plate 55 parallel to the web 52. When two adjacent connectors 5 are joined vertically, they overlap with the adjacent web 52 through the overlapping plate 55. The bottom web 5 of the upper connector 5 contacts the overlapping plate 55 on the inclined plate for positioning. The width of the inclined plate 54 and the overlapping plate 55 is smaller than the width of the connector web.

[0061] like Figure 3 -and Figure 5 As shown, after the connector 5 is installed into the slotted fastener 2 with an open slot, the inclined plate 54 and the overlapping plate 55 extend upward from the open slot in the slotted fastener 2. The extended sections are positioned by overlapping contact with the web plate 52 of the other connector 5 above.

[0062] The slotted fastener 2 with an open slot is generally a flat channel steel, including a connecting web 22 and an envelope portion 21 on both sides. There is an opening between the two ends 211 of the envelope portion 21 that is slightly wider than the thickness of the web of the connector 5, forming an unclosed cavity that can accommodate one end flange 53.

[0063] like Figure 5 The connector 5 is inserted from above into the cavities of the two opposite slotted fasteners 2, thereby fixing the fixing base 1 where each slotted fastener 2 exists.

[0064] Preferably, two U-shaped elastic sealing members are provided at the opening of the groove-shaped fastener 2 to contact the connector 5 and seal the cavity of the groove-shaped fastener 2, so as to avoid grout leakage when pouring concrete later.

[0065] Concrete is poured between the two fixed foundations 1 to form an integral connection node. In the node, the opening in the web of the connector 5 forms a concrete dowel structure with the concrete, which reinforces the connection strength.

[0066] The fixed foundation 1 is generally the joint area of ​​two precast concrete modules, and the grooved fastener 2 is directly embedded and fixed to the concrete wall of the joint area.

[0067] Example 2 This embodiment provides a modular concrete building connection structure, applied to the connection between units in precast concrete modular buildings. For example... Figure 1 As shown, vertically arranged channel steel 2 is embedded in the mating edge of the precast concrete module 1, with the channel opening facing the joint side. The channel steel 2 is integrally cast with the precast concrete module 1 during the factory prefabrication stage. The outer flange of the channel steel 2 is completely wrapped and bonded to the concrete of the precast concrete module 1, while the inner flange is exposed on the mating edge surface of the precast concrete module 1.

[0068] like Figure 2 As shown, the web of the channel steel 2 is provided with vertically spaced through holes 21 at uniform intervals. The through holes 21 are rectangular or circular holes with a diameter of 50 mm, and the spacing between the holes is 200 mm. The through holes 21 penetrate the web of the channel steel 2, and their axes are perpendicular to the plane of the web of the channel steel 2. The through holes 21 allow the post-cast concrete to pass through the web of the channel steel 2, forming a continuous concrete body on the inner and outer sides of the channel steel 2, thus enhancing the anchoring effect between the channel steel 2 and the precast concrete module 1.

[0069] like Figure 1 and Figure 2 As shown, a sealing strip 3 is provided on the inner edge of the channel steel 2. The sealing strip 3 is made of an elastic material, such as closed-cell EPDM rubber, with a U-shaped cross-section. The sealing strip 3 is pasted onto the inner edge of the channel steel 2 during the factory prefabrication stage, and its inner surface is flush with the inner surface of the inner flange of the channel steel 2. The sealing strip 3 has elastic deformation capability. When adjacent precast concrete modules 1 are assembled in place, the sealing strips 3 on both sides of the channel steel 2 are pressed against each other to form a sealing layer, preventing the post-poured concrete grout from leaking out of the channel steel 2.

[0070] like Figure 2As shown, the two flanges of the I-beam connector 5 are inserted into the channel steel 2 of the adjacent precast concrete module 1. The I-beam connector 5 is made of I-beam, and its web height matches the width of the channel steel 2. The two flanges are inserted into the channel steel 2. The web of the I-beam connector 5 has through holes 51 spaced at intervals along the vertical extension direction. The I-beam connector 5 is inserted from above the vertical joint, with its web located between the webs of the two channel steels 2. The two flanges are inserted into the slots of the two channel steels 2, achieving the initial positioning and connection of the adjacent precast concrete modules 1. The I-beam connector 5 is inserted vertically from top to bottom. During the insertion process, the web of the I-beam connector 5 remains parallel to the web of the channel steel 2. After insertion, the through holes 51 of the I-beam connector 5 and the through holes 21 of the channel steel 2 form a through channel.

[0071] like Figure 1 As shown, the transverse reinforcing mesh 6 is laid between adjacent channel steels 2. The transverse reinforcing mesh 6 is welded from HRB400 grade steel bars with a diameter of 12mm, and the mesh size is 200mm x 200mm. The ends of the reinforcing bars in the transverse reinforcing mesh 6 extend 50mm into the channel steel 2, and the ends are spot-welded to the inner flange of the channel steel 2. The transverse reinforcing mesh 6 is located outside the I-beam connector 5, and its plane is parallel to the mating surface of the precast concrete module 1. The transverse reinforcing mesh 6 enhances the transverse tensile strength of the joint area, limits the development of shrinkage cracks in the concrete of the joint area, and improves the crack resistance of the joint area.

[0072] like Figure 2 As shown, the post-cast concrete 7 fills the interior of the channel steel 2 and the joint area between the precast concrete modules 1. The post-cast concrete 7 is poured from the top of the joint area, flowing downwards under its own weight and vibration, filling the interior space of the channel steel 2 and the joint area. The post-cast concrete 7 passes through the through hole 51 of the I-beam connector 5, forming a concrete dowel within the through hole 51. The concrete dowel anchors the channel steel 2, the I-beam connector 5, and the post-cast concrete 7 together, achieving effective force transfer between adjacent precast concrete modules 1. The interface between the post-cast concrete 7 and the precast concrete module 1 forms a rough contact surface. Combined with the shear friction of the interface and the shear bearing capacity of the concrete dowel, the stress performance of the joint area is close to that of a cast-in-place concrete structure.

[0073] The construction method of this embodiment includes the following steps.

[0074] When prefabricating precast concrete modules in the factory, channel steel 2 is installed at the designed docking edge position. Positioning steel bars are set on the outer flange of channel steel 2 and tied to the reinforcement skeleton of the precast concrete module. Sealing strip 3 is pasted on the inner groove edge of channel steel 2. Then, the concrete of the precast concrete module is poured and cured to the design strength.

[0075] The first precast concrete module was hoisted into place on site and its position was adjusted to meet the design requirements.

[0076] The second precast concrete module is hoisted so that the slot of its channel steel 2 is aligned with the slot of the channel steel 2 of the first precast concrete module, and the sealing strips 3 on both sides are squeezed together to form a sealing layer.

[0077] Insert the I-beam connector 5 from above the vertical joint. Insert the flanges of the I-beam connector 5 into the channel steel 2 on both sides respectively. Adjust the position of the I-beam connector 5 to make it stable.

[0078] A transverse steel mesh 1 is laid between adjacent channel steels 2. The ends of the steel bars in the transverse steel mesh 1 extend into the channel steel 2 and are spot welded to the channel steel 2.

[0079] Post-cast concrete 7 is poured inside the channel steel 2 and in the joint area between the precast concrete modules 1. During the pouring process, a vibrator is used to compact the concrete, ensuring that the post-cast concrete 7 fills the internal space of the channel steel 2 and the through hole 51. After the post-cast concrete 7 has cured to the design strength, the adjacent precast concrete modules 1 form an integral connection node.

[0080] In this embodiment, the precast concrete module 1 is quickly positioned and initially connected by the insertion and connection of the channel steel 2 and the I-beam steel connector 5, reducing on-site welding and sleeve grouting operations and shortening the construction cycle. The post-cast concrete 7 enters the cavity of the channel steel 2 and passes through the through hole 51 of the I-beam steel connector 5 to form a concrete dowel. The concrete dowel bears shear and tensile forces in the joint area, anchoring the adjacent precast concrete modules 1 into an integral structure.

[0081] The outer flange of the channel steel 2 is integrated with the concrete of the precast concrete module 1. The channel steel 2 forms a concrete dowel with the post-cast concrete 7 through the through hole 21. The channel steel 2 creates a continuous stress path in the joint area, making the stiffness and load-bearing capacity of the joint area close to that of a cast-in-place concrete structure. The sealing strip 3 prevents leakage of post-cast concrete grout, ensures a clean appearance of the joint area, and reduces the need for later repairs. The transverse steel mesh 1 enhances the transverse tensile strength of the joint area, limits the development of concrete shrinkage cracks, and improves the durability of the joint area.

[0082] Example 3 like Figure 6 The difference between this embodiment and embodiment 2 is that the channel steel 2 is fixed to the outside of the concrete side wall that is hung and fixed to the precast concrete module.

[0083] Specifically, the channel steel 2 is connected to the transverse steel mesh 4 by welding to the back of its web. The transverse steel mesh passes through the ring buckles 6 embedded in the concrete wall to form an anchor. The channel-shaped fixing component 2 is fixed to the wall 1 by hanging the steel mesh 4 on the embedded fasteners 6 in the wall. Example 4 Unlike Embodiment 1, the main body cross-section of connector 5 is Z-shaped. This cross-sectional shape provides a clearly defined guide surface for the flanges, facilitating insertion into the corresponding pre-embedded channel steel and forming a good plug-in connection with the opening slot fixing member. The unique Z-shaped cross-section and the spaced arrangement of the through holes 51 allow for lateral bonding with the post-cast concrete, providing excellent bidirectional bending stiffness and shear resistance.

[0084] Example 5 Unlike Embodiment 1, the main cross-section of connector 5 is C-shaped. This cross-sectional shape provides good bidirectional bending stiffness and shear resistance, while also having a clear guide surface, facilitating insertion into the corresponding pre-embedded channel steel.

[0085] Example 6 This embodiment provides a modular concrete building connection structure, which is applied to the connection between upper and lower modules of a precast concrete modular building.

[0086] The difference from Example 2 is that the channel steel 2 is horizontally arranged at the top or bottom butt edge of the precast concrete module 1, with the groove facing the joint side.

[0087] The steel connector 5 is a C-shaped steel connector. The flanges at both ends of the C-shaped steel connector are inserted into the channel steel 2 of the upper and lower precast concrete modules 1, respectively. The C-shaped steel connector is inserted horizontally from the side of the horizontal joint, with its web located between the webs of the two channel steels 2, and the flanges at both ends inserted into the slots of the upper and lower channel steels 2, respectively.

[0088] The web of the C-shaped steel connector has through holes, which are 50mm x 50mm square holes with a spacing of 200mm.

[0089] The transverse steel mesh 1 is laid between or on the back of the upper and lower channel steels 2, with its plane parallel to the horizontal mating surface of the precast concrete module 1. The post-cast concrete 7 fills the interior of the channel steel 2 and the joint area between the upper and lower precast concrete modules 1. The post-cast concrete 7 passes through the through hole 21 of the channel steel 2 and the through hole of the C-shaped steel connector, forming a concrete dowel in the through hole to achieve effective force transfer between the upper and lower precast concrete modules 1.

[0090] The construction method of this embodiment is similar to that of embodiment 1, except that the C-shaped steel connector is inserted horizontally into the channel steel 2 on both sides from the side of the horizontal joint, the transverse steel mesh 1 is laid between the upper and lower channel steel 2, and the post-cast concrete 7 is poured from the side of the horizontal joint.

[0091] This embodiment is applicable to the connection between upper and lower modules of precast concrete modular buildings. The lateral insertion method of the C-shaped steel connector facilitates operation in narrow spaces between floors. The square through hole increases the shear area of ​​the concrete dowel and improves the shear bearing capacity of the horizontal joint.

[0092] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A type of steel connector with a perforated web, characterized in that... Used for post-cast connection in the joint area of ​​modular concrete buildings; the connector is a long strip metal component, including a web and flanges that form guide surfaces at both ends of the web. The main cross-section adopts a cross-sectional form in which the flange can be inserted into the slot of the groove-type fastener and accommodated therein. Through holes are regularly spaced along the long strip direction in the web area.

2. The web-perforated steel connector according to claim 1, characterized in that... The cross-sectional shape is one of the following: I-shaped, C-shaped, or Z-shaped.

3. The web-perforated steel connector according to claim 1, characterized in that... When the perforated steel connector is inserted into the opening slot, at least a portion of its flange contacts the surface of the slotted fixing member.

4. The web-perforated steel connector according to claim 1, characterized in that... The perforated steel connectors in the web are joined together vertically along their length to form a continuous connection structure.

5. The web-perforated steel connector according to claim 1, characterized in that... The total area of ​​the through holes in the web accounts for 20%-50% of the web area.

6. The web-perforated steel connector according to claim 1, characterized in that... Each web-perforated steel connector has an inclined plate extending upward from the top of the web. The inclined plate is connected to an overlapping plate parallel to the web at a small angle to the web. The width of the inclined plate and the overlapping plate is smaller than the width of the web of the connector.

7. The web-perforated steel connector according to claim 1, characterized in that... After the perforated steel connector is inserted into the slot of the channel-shaped fastener, the inclined plate and the overlapping plate extend out from the slot of the bottom channel-shaped fastener.

8. The web-perforated steel connector according to claim 1, characterized in that... When two adjacent perforated steel connectors are joined together, the lower lap plate overlaps with the upper web plate, and the lap plate surfaces contact each other to form a positioning.

9. The web-perforated steel connector according to claim 1, characterized in that... The perforated steel connector is inserted from above or vertically into the cavity of two opposite slotted fasteners to form an integral connection node for post-casting in the joint area.

10. A modular concrete building wall connector, characterized in that... include: A grooved fastener is fixed to the edge of the joint area of ​​the precast concrete module and located outside the concrete joint wall of the module. The opening of the grooved fastener faces the joint side, and the back is set close to the wall. The grooved fastener is used to insert the web-perforated steel connector as described in any one of claims 1-9.

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