Support-free assembly type primary and secondary beam connecting joint

Abstract

The utility model belongs to the technical field of buildings, and particularly relates to a support-free assembly type primary and secondary beam connecting joint which solves the problem that supports need to be independently arranged at the bottoms of secondary beams; a notch is reserved in the main beam, the cross section is greatly weakened and needs to be reinforced in the hoisting process, and formwork concrete pouring needs to be independently arranged at the notch of the main beam; and the construction process is complicated. The support-free assembly type main and secondary beam connecting joint comprises a prefabricated main beam and a prefabricated secondary beam, the side portion of the prefabricated main beam is provided with a prefabricated beam support which is integrally poured with the prefabricated main beam, and the end portion of the prefabricated secondary beam is placed on the prefabricated beam support. The prefabricated main beam and the prefabricated secondary beam are prefabricated and produced respectively, standardized production can be achieved, the prefabricated beam support is integrally arranged on the side of the prefabricated main beam, the prefabricated secondary beam is simply placed on the prefabricated beam support to achieve assembly, assembly is convenient, the purpose of efficient construction is achieved, and meanwhile the problem that the section of the main beam is weakened is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction, and particularly relates to a support-free assembled main and secondary beam connection node. Background Art

[0002] With the vigorous promotion of prefabricated buildings, more and more public buildings need to be built using prefabricated technology. Conventional column grid sizes are 7.8m×7.8m, 8.1m×8.1m, 8.4m×8.4m, 8.7m×8.7m, etc., using a modular grid. No less than one secondary beam is set in the standard column grid, placed on the side of the main beam, and then the composite plate is arranged.

[0003] In the prior art, the prefabrication of main and secondary beams is usually carried out in the following ways: 1) prefabricated main beams are provided with notches, secondary beams are prefabricated in full length, placed at the notches of the main beams, and concrete is poured after the formwork is sealed on site. The secondary beams need to be supported separately; 2) prefabricated main beams are provided with pre-embedded connecting bolts on the sides corresponding to the positions of the secondary beams, and steel bars are screwed in on site to overlap the steel bars extending from the secondary beams in full section. The secondary beams are provided with an overlap length, and the formwork is sealed on site to pour concrete. The secondary beams need to be supported separately; 3) the steel tongue method provided in the national standard "Technical Standard for Prefabricated Concrete Buildings" GB / T 51231-2016 embeds steel plates in the prefabricated main beams and steel tongues in the prefabricated secondary beams. However, due to the fact that the span of the secondary beams does not exceed 9 meters and is connected by steel tongues, their application in humid and corrosive environments is subject to certain restrictions.

[0004] In order to overcome the shortcomings of the prior art, industry insiders have proposed various solutions after continuous exploration. For example, a Chinese patent discloses a prefabricated main-secondary beam connection node [application number: 2021234076165], including a prefabricated main beam and a prefabricated secondary beam, the prefabricated main beam is provided with at least one notch with a top through it, the top of at least one notch passes through the prefabricated main beam, the bottom of the notch and the bottom of the prefabricated main beam have a vertical height H1, the bottom of the prefabricated main beam and the longitudinal center line I of the prefabricated main beam have a vertical height H2, H1>H2; the prefabricated main beam is pre-embedded with a first steel bar assembly, the upper part of the first steel bar assembly extends out of the prefabricated main beam; the prefabricated secondary beam is arranged at the side end of the prefabricated main beam and corresponds to the notch one by one.

[0005] However, there are also the following problems: the secondary beam extends into the main beam through the steel bar assembly, and the steel bars are placed above the notch of the main beam. The self-weight of the secondary beam cannot be borne by the steel bars, and a separate support is required at the bottom of the secondary beam; a notch is left in the main beam, which is limited by the height of the secondary beam cross-section. When the cross-section of the secondary beam is large, the cross-section of the main beam is greatly weakened, and reinforcement is required during the lifting process, and a separate formwork concrete pouring is required at the notch of the main beam. Utility Model Content

[0006] The utility model aims to solve the above problems in the prior art and proposes a support-free assembled main and secondary beam connection node.

[0007] In order to achieve the purpose of the innovative utility model, the following technical solutions can be used:

[0008] A support-free assembled main-secondary beam connection node comprises a prefabricated main beam and a prefabricated secondary beam. The side of the prefabricated main beam is provided with a prefabricated beam support integrally cast therewith, and the end of the prefabricated secondary beam is placed on the prefabricated beam support.

[0009] In the support-free assembled main and secondary beam connection nodes of the utility model, the prefabricated main beam and the prefabricated secondary beam are respectively prefabricated as a whole, and prefabricated beam supports are also prefabricated on the sides of the prefabricated main beam, so that standardized production in the factory can be realized. The prefabricated beam supports and the prefabricated main beam are cast in one piece, with good integrity and high structural strength. In specific applications, the prefabricated secondary beams can be assembled by simply placing them on the prefabricated beam supports, giving full play to the advantages of the complete cross-section of the main and secondary beams and the dry connection, without the need to set up formwork on site, and no support is required at the bottom of the prefabricated secondary beam, which can reduce on-site construction procedures, ensure the construction period and reduce the instability of construction quality.

[0010] In the above-mentioned support-free assembled primary and secondary beam connection node, the prefabricated beam support is provided with a groove, and the end of the prefabricated secondary beam is placed in the groove.

[0011] The provision of the grooves can prevent the ends of the prefabricated secondary beams from sliding out from both sides, thereby ensuring the stable placement of the prefabricated secondary beams.

[0012] Furthermore, easy-entry guide surfaces are obliquely arranged on both inner sides of the groove to facilitate the rapid docking of the prefabricated secondary beam into the groove.

[0013] In the above-mentioned support-free assembled primary and secondary beam connection node, a notch is provided at the bottom of the end of the prefabricated secondary beam, and the extended end above the notch is placed in the groove.

[0014] A notch is set at the bottom of the prefabricated secondary beam, and the overhanging end on the notch is placed on the groove to achieve overlap, which can adapt to prefabricated secondary beams with higher cross-sections and is beneficial to controlling the height relationship between the upper end surfaces of the prefabricated main beam and the prefabricated secondary beam.

[0015] In the above-mentioned support-free assembled primary and secondary beam connection node, the width of the groove is slightly larger than the width of the prefabricated secondary beam.

[0016] The groove width is greater than the width of the prefabricated secondary beam, which facilitates the placement and entry of the end of the prefabricated secondary beam, and is slightly greater than, which reduces the lateral offset of the end of the prefabricated secondary beam in the groove.

[0017] In the above-mentioned support-free assembled primary and secondary beam connection node, a resting gasket is provided in the groove, which can be used to facilitate the installation and leveling of the prefabricated secondary beam and resist the stress deformation of the prefabricated secondary beam.

[0018] As an optimization, the shelf gasket is fixed in the groove by gluing, which is easy to install and low in cost.

[0019] In the above-mentioned support-free assembled primary and secondary beam connection node, the resting gasket is made of rubber material, and the thickness of the resting gasket is between 10-20 mm.

[0020] In the above-mentioned support-free assembled main and secondary beam connection node, the side of the prefabricated main beam is provided with a plurality of prefabricated beam supports distributed along the length direction of the prefabricated main beam and cast integrally therewith.

[0021] A plurality of prefabricated beam supports can be provided along the length direction of the prefabricated main beam according to specific needs, so as to realize assembly and docking with a plurality of prefabricated secondary beams, and the prefabricated beam supports are highly practical.

[0022] In the above-mentioned support-free assembled main and secondary beam connection node, prefabricated beam supports are provided on both sides of the prefabricated main beam.

[0023] Prefabricated beam supports are arranged on both sides of the prefabricated main beam, which can be used as the prefabricated main beam in the middle position.

[0024] In the above-mentioned support-free assembled primary and secondary beam connection node, an installation gap is reserved between the end surface of the prefabricated secondary beam and the prefabricated primary beam, and a cement mortar joint sealing layer is provided in the installation gap.

[0025] The installation gap is used to accommodate slight errors during installation, and the gap size is between 10-20mm. The cement mortar grouting sealing layer is used to prevent leakage during concrete pouring, and the grouting depth is between 5-15mm.

[0026] In the above-mentioned support-free assembled main-secondary beam connection node, the secondary beam reinforcement on the top surface of the prefabricated secondary beam is anchored under the main beam reinforcement on the top surface of the prefabricated main beam.

[0027] Steel bars are provided on the prefabricated main beam and prefabricated secondary beam, which form a reliable connection after pouring concrete. The structural force transmission mechanism is clear, the connection is safe and reliable, and the components are easy to install. The connection nodes can be standardized, thus achieving the goal of efficient construction. The secondary beam steel bars are anchored in the prefabricated main beam, which improves the overall structural strength. When the prefabricated secondary beams are symmetrically placed on both sides, the secondary beam steel bars penetrate the prefabricated main beam; when the prefabricated secondary beam is placed on one side, the secondary beam steel bars are anchored to the prefabricated main beam by installing steel bar anchor heads.

[0028] Compared with the prior art, the utility model mainly has the following advantages:

[0029] 1. The utility model disassembles the prefabricated main and secondary beam connection nodes which are difficult to construct on site into the prefabricated main beams and prefabricated beam supports, and prefabricates the prefabricated main beams and the prefabricated beam supports as a whole in a factory, thereby realizing standardized production in the factory.

[0030] 2. The utility model can realize the full prefabrication of assembled main and secondary beam nodes, solve the problems of setting post-casting sections and notch reinforcement at the places where prefabricated secondary beams are placed, easy clogging of embedded sleeves on the sides of the main beams, and great influence of environmental categories on steel tongues and grooves, etc.

[0031] 3. The utility model gives full play to the advantages of complete cross-section of primary and secondary beams and dry connection. It does not need to set up formwork on site, and does not need to set up supports at the bottom of prefabricated secondary beams. It can reduce on-site construction procedures, ensure construction period and reduce unstable construction quality.

[0032] 4. The connection method in the utility model can be assembled by simply placing and installing the prefabricated secondary beam in the prefabricated beam support, and the main beam steel bars and the secondary beam steel bars are installed on the prefabricated main beam and the prefabricated secondary beam. A reliable connection is formed after pouring concrete. The structural force transmission mechanism is clear, the connection is safe and reliable, the components are easy to install, and the standardization of the connection nodes can be realized, thereby achieving the goal of efficient construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the separation of the prefabricated main beam and the prefabricated secondary beam provided by the utility model;

[0034] Figure 2 It is a structural schematic diagram of the coordination of the prefabricated main beam and the prefabricated secondary beam provided by the utility model (Example 1);

[0035] Figure 3 It is a top view schematic diagram of the cooperation of the prefabricated main beam and the prefabricated secondary beam provided by the utility model (Example 1);

[0036] Figure 4 It is a schematic diagram of the structure of the prefabricated main beam and the prefabricated secondary beam provided by the utility model (Example 2);

[0037] Figure 5 It is a top view schematic diagram of the cooperation of the prefabricated main beam and the prefabricated secondary beam provided by the utility model (Example 2).

[0038] In the figure, there are prefabricated main beam 1, prefabricated beam support 11, groove 12, easy-entry guide surface 13, main beam reinforcement 14, prefabricated secondary beam 2, notch 21, secondary beam reinforcement 22, overhanging end 23, placement gasket 3, installation gap 4, cement mortar joint sealing layer 41. DETAILED DESCRIPTION

[0039] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0040] Example 1

[0041] Specific implementation examples Figure 1-3 As shown, the support-free assembled main and secondary beam connection node includes a prefabricated main beam 1 and a prefabricated secondary beam 2. The side of the prefabricated main beam 1 is provided with a prefabricated beam support 11 cast integrally therewith, and the end of the prefabricated secondary beam 2 is placed on the prefabricated beam support 11.

[0042] Specifically, in the support-free assembled main and secondary beam connection nodes, the prefabricated main beam 1 and the prefabricated secondary beam 2 are prefabricated as a whole respectively, and a prefabricated beam support 11 is also prefabricated on the side of the prefabricated main beam 1, which can realize standardized production in the factory, wherein the prefabricated beam support 11 and the prefabricated main beam 1 are cast as one body, with good integrity and high structural strength; in specific applications, the prefabricated secondary beam 2 can be assembled simply by placing it on the prefabricated beam support 11, giving full play to the advantages of the complete cross-section of the main and secondary beams and the dry connection, without the need to set up formwork on site, and no support is required at the bottom of the prefabricated secondary beam 2, which can reduce on-site construction procedures, ensure the construction period and reduce the instability of construction quality.

[0043] like Figure 1 , 2 As shown, a groove 12 is provided on the prefabricated beam support 11, and easy-entry guide surfaces 13 are inclinedly provided on both inner sides of the groove 12. The width of the groove 12 is slightly larger than the width of the prefabricated secondary beam 2. A notch 21 is provided at the bottom of the end of the prefabricated secondary beam 2, and the extended end 23 above the notch 21 is placed in the groove 12.

[0044] Specifically, the groove 12 can prevent the end of the prefabricated secondary beam 2 from sliding out from both sides, ensuring the stable placement of the prefabricated secondary beam 2. The width of the groove 12 is greater than the width of the prefabricated secondary beam 2, which is convenient for the end of the prefabricated secondary beam 2 to be placed in, and is slightly greater than, which reduces the lateral displacement of the end of the prefabricated secondary beam 2 in the groove 12. The easy-entry guide surface 13 facilitates the rapid docking of the prefabricated secondary beam 2 into the groove 12. A notch 21 is provided at the bottom of the prefabricated secondary beam 2, and the overhanging end 23 on the notch 21 is placed on the groove 12 to achieve overlap, which can adapt to the prefabricated secondary beam 2 with a higher cross-section, and is conducive to controlling the height relationship between the upper end surfaces of the prefabricated main beam 1 and the prefabricated secondary beam 2.

[0045] As an optimization of this embodiment, a resting gasket 3 is provided in the groove 12, which can be used to facilitate the installation and leveling of the prefabricated secondary beam 2 and resist the stress deformation of the prefabricated secondary beam 2. The resting gasket 3 is made of rubber material. The thickness of the resting gasket 3 is between 10-20 mm. Moreover, the resting gasket 3 is fixed in the groove 12 by gluing, which is easy to install and low in cost.

[0046] In this embodiment, the side of the precast main beam 1 is provided with a plurality of precast beam supports 11 distributed along the length direction of the precast main beam 1 and cast integrally therewith. Precast beam supports 11 are provided on both sides of the precast main beam 1. The secondary beam reinforcement 22 on the top surface of the precast secondary beam 2 is anchored under the main beam reinforcement 14 on the top surface of the precast main beam 1.

[0047] Specifically, multiple prefabricated beam supports 11 are provided along the length direction of the prefabricated main beam 1 according to specific needs, and are used to achieve assembly and docking with multiple prefabricated secondary beams 2, which is highly practical. Reinforcements are provided on the prefabricated main beam 1 and the prefabricated secondary beam 2, and the secondary beam reinforcement 22 is anchored into the prefabricated main beam 1, and a reliable connection is formed after pouring concrete. The structural force transmission mechanism is clear, the connection is safe and reliable, and the components are easy to install, which can realize the standardization of the connection nodes, thereby achieving the goal of efficient construction.

[0048] As an optimization of this embodiment, an installation gap 4 is left between the end surface of the prefabricated secondary beam 2 and the prefabricated main beam 1 , and a cement mortar joint sealing layer 41 is provided in the installation gap 4 .

[0049] Specifically, the installation gap 4 is used to accommodate slight errors during installation, and the gap size is between 10-20 mm. The cement mortar joint sealing layer 41 is used to prevent leakage during concrete pouring, and the joint depth is between 5-15 mm.

[0050] Specific working principle: Several prefabricated beam supports 11 are symmetrically distributed on both sides of the prefabricated main beam 1, and the prefabricated secondary beams 2 correspond to the prefabricated beam supports 11 one by one. During installation, a resting gasket 3 is pasted on the bottom of the groove 12, and the extended end 23 of the prefabricated secondary beam 2 is placed on the resting gasket 3 in the groove 12. After installation, mortar is used to grout the top surface of the installation gap 4 to form a cement mortar grouting plugging layer 41 to prevent leakage during the pouring of the overlapping layer concrete. After that, the secondary beam steel bars 22 and the main beam steel bars 14 are installed, and the secondary beam steel bars 22 are anchored in the prefabricated main beam 1. Finally, the overlapping layer concrete is poured to form a whole.

[0051] Example 2

[0052] The specific working principle of this embodiment is basically the same as the specific working principle of Embodiment 1, except that the prefabricated main beam 1 is only connected to the prefabricated secondary beam 2 on one side.

[0053] Specific implementation examples Figure 4 , 5 As shown, a prefabricated secondary beam 2 is placed on one side of the prefabricated main beam 1 through a prefabricated beam support 11, and the secondary beam steel bars 22 are reinforced and anchored to the prefabricated main beam 1 by installing steel bar anchor heads.

[0054] Specific working principle: After the prefabricated main beam 1 and the prefabricated secondary beam 2 are installed in place and grouted, steel bar anchor heads are installed at the ends of the secondary beam steel bars 22 to strengthen the anchorage, and then the main beam steel bars 14 are installed. After the main beam steel bars 14 are installed, the overlapping layer concrete is poured to form a whole.

[0055] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A support-free assembled primary and secondary beam connection node, characterized in that: The invention comprises a prefabricated main beam (1) and a prefabricated secondary beam (2), wherein the side of the prefabricated main beam (1) is provided with a prefabricated beam support (11) cast integrally therewith, and the end of the prefabricated secondary beam (2) is placed on the prefabricated beam support (11); the prefabricated beam support (11) is provided with a groove (12), and the end of the prefabricated secondary beam (2) is placed in the groove (12); a notch (21) is provided at the bottom of the end of the prefabricated secondary beam (2), and an extended end (23) above the notch (21) is placed in the groove (12); the width of the groove (12) is slightly larger than the width of the prefabricated secondary beam (2), and a placement gasket (3) is provided in the groove (12) for facilitating the installation and leveling of the prefabricated secondary beam (2) and resisting the stress deformation of the prefabricated secondary beam (2).

2. The support-free assembled primary and secondary beam connection node according to claim 1 is characterized in that: The resting pad (3) is made of rubber material.

3. The support-free assembled primary and secondary beam connection node according to claim 1 or 2, characterized in that: The side of the prefabricated main beam (1) is provided with a plurality of prefabricated beam supports (11) distributed along the length direction of the prefabricated main beam (1) and cast integrally therewith.

4. The support-free assembled primary and secondary beam connection node according to claim 1 or 2, characterized in that: Prefabricated beam supports (11) are provided on both sides of the prefabricated main beam (1).

5. The support-free assembled primary and secondary beam connection node according to claim 1 or 2, characterized in that: An installation gap (4) is provided between the end surface of the prefabricated secondary beam (2) and the prefabricated main beam (1), and a cement mortar joint sealing layer (41) is provided in the installation gap (4).

6. The support-free assembled primary and secondary beam connection node according to claim 5 is characterized in that: The secondary beam reinforcement (22) on the top surface of the prefabricated secondary beam (2) is anchored under the main beam reinforcement (14) on the top surface of the prefabricated main beam (1).

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