Precast beam connecting node structure

Abstract

The utility model discloses a precast beam connection node structure which comprises a precast main beam and a precast secondary beam, a notch connected with the precast secondary beam is reserved in the precast main beam, first positioning plates are attached to the two side faces of the precast main beam and located on the upper middle portion of the notch, and through bolt holes are formed in the positions, between the first positioning plates on the two sides, of the precast main beam. The two first positioning plates are fixedly connected with the prefabricated main beam through split bolts inserted in the bolt holes in a penetrating mode, four high-strength bolts are embedded in the positions, close to the four corners of the notch, of the bottom of the prefabricated main beam, second positioning plates are attached to the positions, below the high-strength bolts, of the bottom face of the prefabricated main beam, and through holes are formed in the positions, corresponding to the high-strength bolts, of the second positioning plates. The second positioning plate is fixedly connected with the prefabricated main beam through high-strength bolts and nuts. According to the utility model, the straightness and flatness of the two ends of the notch can be checked, meanwhile, the damage such as steel bar distortion is avoided, the safety in the hoisting process is ensured, and the node quality after the prefabricated primary and secondary beams are installed is also improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of the construction of precast concrete building structures, and particularly relates to a connecting node structure of precast beams. Background Art

[0002] In the traditional cast-in-place structure, all joints are required to be poured and completed, and the integrity after completion can be ensured. Moreover, a series of problems such as connection, quality, and safety are solved during the process of the procedure. As a new representative of the current cooperation production mode between modern industry and traditional construction industry, in the context of the country's strong promotion, with standardized design, factory production, assembly construction, information management, and intelligent application, a large number of building components (exterior wall panels, interior wall panels, laminated panels, balconies, air-conditioning panels, stairs, precast beams, precast columns, etc.) are produced and processed in the workshop and transported to the site to be connected with the cast-in-place structure as a whole; however, the large stiffness of precast components leads to great difficulty in secondary adjustment on site, and steel bars are greatly affected by the outside world, and the construction quality cannot be guaranteed. In order to effectively improve the installation efficiency above, ensure the construction quality, and ensure the safety of hoisting, combined with the actual situation of the project, specific problems should be analyzed specifically to meet the needs of on-site construction.

[0003] In the existing precast structure, at the intersection of the main beam and the secondary beam, during the precast production process, a connection notch for the secondary beam is left in the main beam, the full-length steel bars in the original beam are reserved, and the steel bars at the end of the secondary beam are anchored. After a series of installations are completed, concrete is poured at the joint. The problems existing in the above existing precast process are as follows:

[0004] (1) During the overall production, transportation, and hoisting of the main beam, the steel bars reserved at the ports in the beam are prone to deformation and distortion. Once deformation occurs, the non-secondary-processability of the steel bars results in a great reduction in their quality performance; moreover, during the hoisting process, the safety risk increases when hoisting at both ends together;

[0005] (2) The relative stiffness of the steel bars (relative to reinforced concrete components) is not sufficient to ensure the integrity of the main beam, the flatness during production and installation cannot be controlled, the secondary adjustment is difficult, and the reserved steel bars will be damaged;

[0006] (3) After the main beam is installed, when the end of the secondary beam is installed, the reserved steel bars at the end make it difficult to install in place on site;

[0007] (4) The installation quality, hoisting safety, and integrity of the entire main and secondary beam joints cannot be guaranteed.

[0008] If the above problems cannot be guaranteed, the cast-in-place structure is mainly used instead, resulting in the inability to meet practices such as the precast ratio and not meeting the original intention of promoting green construction. Content of the Utility Model

[0009] The purpose of the present utility model is to provide a connection node structure for precast beams to solve the problems raised in the above-mentioned background technology.

[0010] In order to achieve the above technical effects, the technical solution adopted by the present utility model is:

[0011] A connection node structure for precast beams includes a precast main beam and a precast secondary beam. The precast main beam is reserved with a notch for connecting with the precast secondary beam. First positioning plates are attached to the two side surfaces of the precast main beam and at the upper middle part of the notch. The precast main beam is provided with through bolt holes between the first positioning plates on both sides. The two first positioning plates are fixedly connected to the precast main beam through tension bolts inserted into the bolt holes. Four high-strength bolts are embedded at the four corners of the precast main beam bottom near the notch. A second positioning plate is attached to the bottom surface of the precast main beam below the high-strength bolts. The second positioning plate is provided with through holes corresponding to the high-strength bolts, and the second positioning plate is fixedly connected to the precast main beam through the high-strength bolts and nuts.

[0012] Further, the first positioning plate is a channel steel, and its web is in contact with the precast main beam. The second positioning plate is a steel plate with a thickness of 12 mm.

[0013] Further, sleeves are embedded at the bolt holes of the precast main beam.

[0014] Further, couplers are left at the steel bar joints at the end interfaces of the precast main beam and the precast secondary beam.

[0015] Further, a tongue-and-groove is provided at the notch position of the precast main beam. The tongue-and-groove is provided with a bevel groove, and its depth is 30 ± 2 mm.

[0016] Further, the contact surface at the secondary casting position of the precast main beam and the precast secondary beam is a rough surface.

[0017] Further, a plurality of lifting hooks are arranged at intervals along the length direction of the precast main beam and the precast secondary beam.

[0018] Further, through bolt holes are also provided at both ends of the precast main beam, and sleeves are also provided in the bolt holes.

[0019] Compared with the prior art, the beneficial effects of the present utility model are: By providing the first positioning plate and the second positioning plate at the notch of the precast main beam, the present utility model temporarily fixes and connects the casting bodies of the precast main beam at both ends of the notch through the first positioning plate and the second positioning plate, checks the straightness and flatness of both ends of the notch by using the flatness of the back of the positioning plate, and at the same time protects the main reinforcement at the notch to avoid damage such as steel bar distortion. Moreover, the safety during the hoisting process is ensured by the stiffness of the first and second positioning plates, and the joint quality after the installation of the precast main and secondary beams is also improved.

[0020] The above description is only an overview of the technical solution of the present utility model. In order to better understand the technical means of the present utility model, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the connection node structure of the precast main and secondary beams of the present utility model.

[0022] Figure 2 It is a schematic diagram of the structure of the precast main beam of the present utility model;

[0023] Figure 3 is Figure 2 the A-A sectional structure view of

[0024] Figure 4 It is a schematic diagram of the structure at the end interface of the precast beam of the present utility model.

[0025] The reference numerals and corresponding names in the figure are:

[0026] 1. Precast main beam, 11. Notch, 12. Bolt hole,

[0027] 13. Tongue-and-groove, 2. Precast secondary beam, 3. First positioning plate,

[0028] 4. Second positioning plate, 5. High-strength bolt, 6. Hook,

[0029] 7. Connector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] A precast beam connection node structure, as Figures 1-4As shown in the figure, the precast beam connection joint structure includes a precast main beam 1 and a precast secondary beam 2. Among them, a plurality of lifting hooks 6 are arranged at intervals along the length direction of the precast main beam 1 and the precast secondary beam 2. The steel bars at the end interfaces of the precast main beam 1 and the precast secondary beam 2 are disconnected, and a coupler 7 (required to be a first-class joint) is left at the end steel bar joints at the interfaces to facilitate the installation of the subsequent steel bars and the hoisting connection of the beams. Through bolts 12 are provided at both ends of the precast main beam 1, and sleeves are arranged in the through bolts 12. A notch 11 for connecting with the precast secondary beam 2 is reserved at the connection of the precast main beam 1 and the precast secondary beam 2. First positioning plates 3 are pasted on both side surfaces of the precast main beam 1 and at the upper middle part of the notch 11. The first positioning plates 3 are made of 8# channel steel, with their notch facing outwards, and the web is in contact with the precast main beam 1. Through holes are opened at both ends of the first positioning plates 3, and sleeves are also embedded at the corresponding parts of the through holes of the first positioning plates 3 on both sides of the precast main beam 1 to form through bolts 12 for the tension bolts to pass through. The two first positioning plates 3 are fixedly connected to the precast main beam 1 through the tension bolts inserted into the through bolts 12. Four high-strength bolts 5 are embedded at the four corners of the bottom of the precast main beam 1 and near the notch 11. A second positioning plate 4 is pasted on the bottom surface of the precast main beam 1 below the high-strength bolts 5. The second positioning plate 4 is a steel plate with a thickness of 12 mm. Through holes are provided at the positions of the second positioning plate 4 corresponding to the high-strength bolts 5, and the second positioning plate 4 is fixedly connected to the precast main beam 1 through the high-strength bolts 5 and nuts. A tongue-and-groove 13 is provided at the position of the notch 11 of the precast main beam 1. The tongue-and-groove 13 is provided with a bevel groove, and its depth is 30 ± 2 mm. The contact surfaces at the secondary pouring positions of the precast main beam 1 and the precast secondary beam 2 are rough surfaces.

[0031] The utility model temporarily fixes and connects the cast-in-place parts of the precast main beam at both ends of the notch through the first positioning plate and the second positioning plate. The channel steel and the steel plate are used for fixing and positioning, which can not only protect the main reinforcement, avoid damage such as steel bar distortion, ensure the quality of the full-length main reinforcement, but also effectively control the straightness and flatness of the segmented beam, and avoid secondary adjustment during hoisting. By using a coupler at the beam end, the hoisting and positioning efficiency of the beam can be effectively improved, and the secondary installation of the subsequent steel bars does not affect the overall progress of hoisting; and it avoids the collision and distortion damage of the end steel bars during hoisting. The connection core area is treated with rough surfaces, tongue-and-grooves, etc., which ensures the connection construction quality of the joints, has high overall construction efficiency, meets the shear bearing capacity and stiffness requirements of the joint core area, and can also effectively ensure the integrity of the prefabricated assembly.

[0032] The utility model is not limited to the above specific implementation manners. For those of ordinary skill in the art, starting from the above concepts, without creative labor, all kinds of transformations made fall within the protection scope of the utility model.

Claims

1. A prefabricated beam connection node structure, comprising a prefabricated main beam and a prefabricated secondary beam, wherein the prefabricated main beam is provided with a notch connected to the prefabricated secondary beam, characterized in that: The first positioning plates are attached to the two side surfaces of the prefabricated main beam and located in the middle and upper part of the notch. The prefabricated main beam is provided with bolt holes between the first positioning plates on both sides. The two first positioning plates are fixedly connected to the prefabricated main beam by tension bolts inserted in the bolt holes. Four high-strength bolts are pre-embedded at the bottom of the prefabricated main beam and near the four corners of the notch. A second positioning plate is attached to the bottom surface of the prefabricated main beam below the high-strength bolts. The second positioning plate is provided with through holes corresponding to the high-strength bolts. The second positioning plate is fixedly connected to the prefabricated main beam by high-strength bolts and nuts.

2. A prefabricated beam connection node structure according to claim 1, characterized in that: The prefabricated main beam is provided with a sleeve embedded in the bolt hole.

3. The prefabricated beam connection node structure according to claim 1, characterized in that: Connectors are retained at the steel bar joints at the end interfaces of the prefabricated main beam and the prefabricated secondary beam.

4. The prefabricated beam connection node structure according to claim 1, characterized in that: A tongue and groove is left at the notch position of the prefabricated main beam, and the tongue and groove is set with a bevel, and its depth is 30±2mm.

5. The prefabricated beam connection node structure according to claim 1, characterized in that: The contact surface of the secondary casting position of the prefabricated main beam and the prefabricated secondary beam is a rough surface.

6. The prefabricated beam connection node structure according to claim 1, characterized in that: The prefabricated main beam and the prefabricated secondary beam are provided with a plurality of hooks at intervals along the length direction.

7. The prefabricated beam connection node structure according to claim 1, characterized in that: The first positioning plate is a channel steel, the web of which is bonded to the prefabricated main beam, and the second positioning plate is a 12 mm thick steel plate.

8. The prefabricated beam connection node structure according to claim 1, characterized in that: Both ends of the prefabricated main beam are also provided with bolt holes that penetrate each other, and sleeves are also provided in the bolt holes.

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