Connecting structure based on primary and secondary beams

Abstract

The utility model relates to the technical field of assembly type building structures, and discloses a connecting structure based on a primary beam and a secondary beam, a prefabricated main beam comprises a first main beam and a second main beam, the first main beam and the second main beam share the same reinforcing steel bar system, and a mounting notch used for mounting the prefabricated secondary beam is formed between the first main beam and the second main beam; longitudinal bars are arranged in the prefabricated secondary beams, the ends of the longitudinal bars penetrate out of the prefabricated secondary beams and stretch into the mounting notches to be staggered with the steel bar system in the prefabricated main beam, and the mounting notches are filled with concrete. The two ends of the longitudinal bars are bent in the thickness direction of the prefabricated secondary beam. In practical application, the problems that existing prefabricated primary and secondary beams are difficult to construct and poor in node forming quality in the construction process are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled building structures, in particular to a connection structure based on primary and secondary beams. Background Art

[0002] In the existing construction process of the main and secondary beam nodes of prefabricated components, one method is to use cast-in-place nodes, in which grooves are set on the main beam, the exposed part of the beam bottom reinforcement is connected with the secondary beam steel bars, and concrete is poured after formwork is supported to form the overall main and secondary beam nodes. This method easily leads to inadequate connection between the main beam and secondary beam steel bars, easy collision of steel bars, difficulty in formwork support, and great difficulty in operation; another method is to use ox-bearing board overlap, in which the secondary beam is placed in the groove of the main beam and welded to connect, and concrete grouting is poured to form a node. This node is prone to shear failure surface, the main beam groove position is weak, and it is easy to crack or damage during transportation and lifting.

[0003] In view of the above problems, the utility model provides a connection structure based on primary and secondary beams, which realizes the simple and quick construction process of the primary and secondary beam nodes of prefabricated components and ensures the strength and rigidity of the primary and secondary beam nodes. Utility Model Content

[0004] The utility model aims to provide a connection structure based on primary and secondary beams to solve the problems of construction difficulty and poor node forming quality in the construction process of the primary and secondary beams of existing prefabricated components.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a connection structure based on main and secondary beams, the prefabricated main beam comprises a first main beam and a second main beam, the first main beam and the second main beam share the same reinforcement system, an installation notch for installing the prefabricated secondary beam is provided between the first main beam and the second main beam; longitudinal reinforcement is provided in the prefabricated secondary beam, the ends of the longitudinal reinforcement pass through the prefabricated secondary beam and extend into the installation notch, and the installation notch is filled with concrete; the two ends of the longitudinal reinforcement are horizontally bent along the thickness direction of the prefabricated secondary beam.

[0006] The principles and advantages of this solution are:

[0007] 1. In the prior art, in order to facilitate transportation and hoisting, the main beam of the same span is split into two independent main beams, and then the steel bars at the ends of the two main beams are tied. In order to ensure the connection strength of the steel bars, the overlapping binding length of the steel bars of the two main beams is not less than 100cm. In the present invention, the first main beam and the second main beam in the prefabricated main beam are supported by the same steel bar system. The complete and continuous steel bar system makes the overall strength and rigidity of the prefabricated main beam high, so that the width of the installation gap set between the two is only the thickness of the prefabricated secondary beam. The installation gap is usually 20cm, and the number of steel bars in the prefabricated main beam is generally eight. When the span length of the beam is the same, the amount of steel bars used at the installation gap in the prior art is 1600cm, and more stirrups are required. In this solution, the amount of steel bars used at the installation gap is 160cm. Therefore, this solution reduces the amount of steel bars by at least 10 times while ensuring the overall connection strength of the prefabricated main beam, greatly reducing the production cost and construction cost.

[0008] 2. The ends of the longitudinal reinforcement of the prefabricated secondary beam are bent along the thickness direction, which can effectively avoid the collision of reinforcements at the nodes of the primary and secondary beams, reduce rework and material waste caused by reinforcement conflicts, reduce construction costs overall, and effectively reduce the workload of on-site reinforcement processing and adjustment, greatly improving construction efficiency.

[0009] Furthermore, the ends of the longitudinal bars passing through the prefabricated secondary beams remain parallel.

[0010] The ends of each longitudinal reinforcement passing through the prefabricated secondary beam remain parallel, which reduces the complexity of steel bar connection during on-site installation, makes the connection between the prefabricated main beam and the prefabricated secondary beam more direct, effectively reduces the workload of on-site steel bar welding and binding, and improves construction efficiency.

[0011] Furthermore, the prefabricated main beam is provided with connecting steel plates on both sides along the thickness direction, the connecting steel plates are provided with mounting holes, and the connecting steel plates connect the first main beam and the second main beam.

[0012] The above-mentioned arrangement increases the strength and rigidity of the precast main beam at the installation notch, and avoids the situation that when the span of the precast main beam is too long and there is no concrete at the installation notch to support the beam reinforcement, the beam reinforcement of the precast main beam at the installation notch is easily bent during the lifting and transportation process, so that the precast main beam needs to be reworked or even replaced as a whole, which greatly increases the construction cost and construction period; and the connecting steel plate acts as a casting template and forms a casting space with the precast main beam and the precast secondary beam, and the connecting steel plate can be quickly removed after the cast-in-place concrete solidifies, so the overall construction is simpler and faster.

[0013] Furthermore, the thickness of the connecting steel plate is 15-30 mm.

[0014] In the above setting, the thickness of the connecting steel plate is 15-30mm. On the one hand, it is to ensure that the connecting steel plate has sufficient strength and rigidity to ensure that the prefabricated main beam will not bend at the installation notch during transportation and hoisting. On the other hand, it is to reduce the material cost and the weight of the connecting steel plate and reduce the labor intensity of construction personnel when installing the connecting steel plate.

[0015] Furthermore, the length of the connecting steel plate is not less than 1.8 times the groove width of the installation notch along the span direction of the prefabricated main beam.

[0016] The above-mentioned arrangement enables the connecting steel plate to span a wider area on both sides of the installation notch, forming a continuous support between the connecting steel plate and the prefabricated main beam, effectively reducing the flexural deformation of the prefabricated main beam in the installation notch area and improving the overall stiffness of the structure; at the same time, the longer connecting steel plate can effectively protect the installation notch area from damage caused by accidental impact or extrusion during transportation and lifting, ensuring that the prefabricated main beam remains in good condition before arriving at the installation position.

[0017] Furthermore, bolt sleeves are pre-buried on both sides of the first main beam and the second main beam along the thickness direction, and the bolt sleeves correspond to the positions of the mounting holes.

[0018] The above arrangement realizes easy and quick disassembly and assembly, recycling of the connecting steel plate, improves construction efficiency and reduces construction costs. At the same time, the embedded bolt sleeve avoids damage to the overall structure of the prefabricated main beam by on-site drilling. The bolt sleeve is connected to the concrete as a whole, making the connection between the connecting steel plate and the prefabricated main beam more stable and firm.

[0019] Furthermore, the mounting hole is in an oblong shape.

[0020] The bolt passes through the mounting hole and enters the bolt sleeve to fix the connecting steel plate. During installation, if the mounting hole is a circular hole, the mounting hole and the bolt sleeve need to be fully aligned before the bolt can be installed. This leads to high precision requirements when opening the connecting steel plate and pre-embedding the bolt sleeve, which takes a lot of time and increases production costs. It also increases the alignment time during installation and reduces construction efficiency. In the above setting, the mounting hole is made into an oblong shape, which makes the installation flexibility between the mounting hole and the bolt sleeve higher, reduces the difficulty of installation alignment for construction personnel, reduces production precision requirements, and effectively saves enterprise costs.

[0021] Furthermore, both ends of the longitudinal reinforcement passing through the prefabricated secondary beam are sleeved with anchor plates.

[0022] The combination of anchor plates and avoidance steel bars overcomes the problems of traditional L-shaped bent reinforcement anchorage crowding, which makes it difficult to place precast beams during installation, large adjustments, and difficulty in vibrating concrete during pouring. It improves the forming quality at the nodes of precast primary and secondary beams, while also reducing the length of the end anchor steel bars, saving steel and reducing costs.

[0023] Furthermore, a plurality of strip grooves are formed on the two facing side surfaces of the first main beam and the second main beam and the end surface of the prefabricated secondary beam, and the surface roughness of the strip grooves is greater than the surface roughness of the prefabricated main beam and the prefabricated secondary beam.

[0024] The above arrangement improves the integrity and adhesion between the precast main beam and the precast secondary beam and the cast-in-place concrete, increases the strength and rigidity of the main and secondary beam nodes, and improves the node forming quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the nodes of the primary and secondary beams of an embodiment of the utility model.

[0026] Figure 2 This is a top view of the prefabricated main beam according to an embodiment of the utility model.

[0027] Figure 3 It is a front view of the prefabricated main beam of an embodiment of the utility model.

[0028] Figure 4 This is a schematic structural diagram of the connecting steel plates according to an embodiment of the utility model.

[0029] Figure 5 This is a top view of a prefabricated secondary beam according to an embodiment of the utility model.

[0030] Figure 6 This is a schematic diagram of the end structure of the longitudinal reinforcement according to an embodiment of the utility model. DETAILED DESCRIPTION

[0031] The following is further described in detail through specific implementation methods:

[0032] The figure marks in the drawings of the specification include: precast main beam 1, first main beam 11, second main beam 12, installation notch 13, bolt sleeve 14, precast secondary beam 2, longitudinal reinforcement 21, first horizontal longitudinal reinforcement 211, second horizontal longitudinal reinforcement 212, avoidance reinforcement 213, anchor plate 22, connecting steel plate 3, installation hole 31, concrete 4.

[0033] Example

[0034] A connection structure based on primary and secondary beams, such as Figure 1-Figure 3As shown, it includes a precast main beam 1 and a precast secondary beam 2, both of which are reinforced concrete structures. The precast main beam 1 includes a first main beam 11 and a second main beam 12. The first main beam 11 and the second main beam 12 share the same reinforcement system. An installation notch 13 for installing the precast secondary beam 2 is provided between the first main beam 11 and the second main beam 22. A plurality of rows of longitudinal bars 21 are evenly arranged in the height direction of the precast secondary beam 2. Both ends of the longitudinal bars 21 pass through the precast secondary beam 2 and extend into the installation notch 13. Concrete 4 is poured in the installation notch 13. The concrete 4 solidifies to connect and fix the precast main beam 1 and the precast secondary beam 2. Among them, the reinforcement system in the precast main beam 1 includes multiple layers of beam reinforcement distributed along the height direction of the precast main beam. In this embodiment, the reinforcement system is three layers of beam reinforcement, and vertical reinforcement is connected between the three layers of beam reinforcement.

[0035] like Figure 2-Figure 4 As shown in the combination, the prefabricated main beam 1 is installed with connecting steel plates 3 on both sides of the installation notch 13 along its thickness direction. The connecting steel plates 3 connect the first main beam 11 and the second main beam 12. The connecting steel plates 3 are evenly opened with multiple installation holes 31 for bolts to pass through on the left and right sides. The first main beam 11 and the second main beam 12 are both provided with multiple bolt sleeves 14 on both sides corresponding to the positions of the installation holes 31. The installation holes 31 are oblong, so as to reduce the alignment accuracy requirements of the installation holes 31 and the bolt sleeves 14 during on-site installation, so that construction personnel have more installation and adjustment activities. In this embodiment, the thickness of the connecting steel plate 3 is 20 mm, and the length of the connecting steel plate 3 is twice the groove width of the installation notch 13 along the span direction of the prefabricated main beam 1. The symmetry axis between the connecting steel plate 3 and the installation notch 13 is located in the same vertical plane, so as to ensure that the connecting steel plate 3 stably supports the installation notch 13 area of ​​the prefabricated main beam 1 to prevent flexural deformation.

[0036] like Figure 5 and Figure 6 As shown in the figure, the longitudinal reinforcement 21 in the prefabricated secondary beam 2 includes a first horizontal longitudinal reinforcement 211 and a second horizontal longitudinal reinforcement 212 located at both ends of the first horizontal longitudinal reinforcement 211. The second horizontal longitudinal reinforcement 212 passes through the prefabricated secondary beam 2 and remains parallel. An avoidance steel bar 213 is provided between the first horizontal longitudinal reinforcement 211 and the second horizontal longitudinal reinforcement 212. The avoidance steel bar 213 is horizontally bent along the thickness direction of the prefabricated secondary beam 2, so that the first horizontal longitudinal reinforcement 211 and the second horizontal longitudinal reinforcement 212 are staggered in the same plane. The specific bending direction of the avoidance steel bar 213 is designed according to the actual structure of the house; anchor plates 22 are installed on the two ends of the longitudinal reinforcement 21 passing through the prefabricated secondary beam 2, and the anchor plates 22 improve the forming quality at the node of the primary and secondary beams, and at the same time reduce the length of the anchor steel bar at the end of the longitudinal reinforcement 21, saving steel and reducing costs.

[0037] In order to further enhance the strength and rigidity of the nodes between the main and secondary beams, a plurality of strip grooves (not shown in the figure) are provided on the two opposing sides of the first main beam 11 and the second main beam 12 and on the left and right end faces of the precast secondary beam 2. The surface roughness of the strip grooves is greater than the surface roughness of the precast main beam 1 and the precast secondary beam 2, so as to improve the direct bonding between the new and old concrete.

[0038] The specific implementation process is as follows:

[0039] When applying specific Figure 1 As shown, before the prefabricated main beam 1 is hoisted and transported, the connecting steel plates 3 are fixed on both sides of the installation gap 13 by connecting bolts and bolt sleeves 14, and the first main beam 11 and the second main beam 12 are connected by the connecting steel plates 3 to support and protect the installation gap 13. Then, the prefabricated main beam 1 is hoisted to the installation position for installation by using hoisting equipment. After the installation of the prefabricated main beam 1 is completed, according to the positional relationship between the prefabricated secondary beam 2 and the prefabricated main beam 1, the connecting steel plate 3 close to the side of the prefabricated secondary beam 2 is removed, and the connecting steel plate 3 on the other side remains stationary and serves as a casting template. The prefabricated secondary beam 2 is hoisted and its end is placed in the installation gap 13. A casting space is formed between the prefabricated main beam 1, the prefabricated secondary beam 2 and the remaining connecting steel plates 3, and concrete 4 is poured in the casting space. After the concrete 4 solidifies, the remaining connecting steel plates 3 are removed to complete the assembly construction of the prefabricated main beam 1 and the prefabricated secondary beam 2.

[0040] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A connection structure based on primary and secondary beams, characterized in that: It comprises a prefabricated main beam and a prefabricated secondary beam, wherein the prefabricated main beam comprises a first main beam and a second main beam, wherein the first main beam and the second main beam share the same reinforcement system, and an installation notch for installing the prefabricated secondary beam is arranged between the first main beam and the second main beam; longitudinal reinforcement is arranged in the prefabricated secondary beam, and ends of the longitudinal reinforcement pass through the prefabricated secondary beam and extend into the installation notch to be staggered with the reinforcement system in the prefabricated main beam, and the installation notch is filled with concrete; both ends of the longitudinal reinforcement are horizontally bent along the thickness direction of the prefabricated secondary beam.

2. A connection structure based on primary and secondary beams according to claim 1, characterized in that: The ends of the longitudinal bars passing through the prefabricated secondary beams remain parallel.

3. The connection structure based on primary and secondary beams according to claim 2, characterized in that: The prefabricated main beam is provided with connecting steel plates on both sides along the thickness direction, and mounting holes are opened on the connecting steel plates. The connecting steel plates connect the first main beam and the second main beam.

4. The connection structure based on primary and secondary beams according to claim 3, characterized in that: The thickness of the connecting steel plate is 15-30 mm.

5. The connection structure based on primary and secondary beams according to claim 4, characterized in that: The length of the connecting steel plate is not less than 1.8 times the groove width of the installation notch along the span direction of the prefabricated main beam.

6. The connection structure based on primary and secondary beams according to claim 5, characterized in that: Bolt sleeves are pre-buried on both sides of the first main beam and the second main beam along the thickness direction, and the bolt sleeves correspond to the positions of the mounting holes.

7. The connection structure based on primary and secondary beams according to claim 6, characterized in that: The mounting hole is in an oblong shape.

8. The connection structure based on primary and secondary beams according to claim 7, characterized in that: Both ends of the longitudinal reinforcement passing through the prefabricated secondary beam are sleeved with anchor plates.

9. The connection structure based on primary and secondary beams according to claim 8, characterized in that: A plurality of strip grooves are formed on the two facing side surfaces of the first main beam and the second main beam and the end surface of the prefabricated secondary beam, and the surface roughness of the strip grooves is greater than the surface roughness of the prefabricated main beam and the prefabricated secondary beam.

Images