Integrated assembly type precast beam

Abstract

The utility model relates to the technical field of assembly type building structures, and discloses an integrated assembly type precast beam which comprises a precast beam body, a plurality of rows of longitudinal steel bars are arranged in the precast beam body in the height direction of the precast beam body, and the longitudinal steel bars comprise first longitudinal bars located at the upper end and the lower end of the precast beam body. The two ends of the first longitudinal bars penetrate out of the precast beam body and are horizontally bent in the thickness direction of the precast beam body, and the ends, penetrating out of the precast beam body, of the first longitudinal bars are parallel to one another. The upper surface of the precast beam body is provided with shear reinforcements. In practical application, the problems that the precast beam is difficult to install and poor in forming quality in the assembling process are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled building structures, in particular to an integrated assembled prefabricated beam. Background Art

[0002] Prefabricated buildings are produced by prefabricating components in factories and installing them on site, realizing standardized design, factory production, and assembly construction, and achieving sustainable development of energy conservation, environmental protection, and maximizing the value of the entire life cycle of building products. Prefabricated buildings still use reinforced concrete structures, in which the assembly nodes are mainly beam-column nodes. The beam-column nodes are the core areas of the nodes. Most earthquake damage occurs in the core areas of columns and beam-column nodes. Severe damage to the nodes will cause the collapse of the entire frame.

[0003] Compared with the integral beam-column structure of cast-in-place concrete, the connection nodes formed by the assembly of precast beams and other components have higher requirements in terms of strength and rigidity. Therefore, a large number of steel bars are required, which makes the precast beams large and bulky as a whole, making them difficult to hoist and transport. In addition, too many steel bars make it difficult to coordinate and install the components at the connection nodes, which not only results in poor forming quality of the connection nodes, but also prolongs the construction period and increases construction costs. Utility Model Content

[0004] The utility model aims to provide an integrated assembled prefabricated beam to solve the problems of difficult installation and poor node forming quality of prefabricated beams in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an integrated assembled prefabricated beam, including a prefabricated beam body, wherein the prefabricated beam body is provided with multiple rows of longitudinal steel bars along its height direction, wherein the longitudinal steel bars include first longitudinal bars located at the upper and lower ends of the prefabricated beam body, wherein the two ends of the first longitudinal bars pass through the prefabricated beam body and are horizontally bent along the thickness direction of the prefabricated beam body, and the ends of each first longitudinal bar passing through the prefabricated beam body are parallel to each other; the prefabricated beam body is provided with shear steel bars on its upper surface.

[0006] The principle and advantages of this scheme are

[0007] 1. Most of the existing beam-column nodes adopt the parallel staggered bottom reinforcement of the precast beam to arrange the longitudinal reinforcement of adjacent spans. The parallel staggered method is adopted to facilitate the installation of precast components. The number of steel bars that can be arranged in each layer will be reduced, and the spacing between the steel bars needs to be increased. At the same time, in order to ensure the strength of the node, more layers of steel bars need to be arranged, which makes the components large and bulky, and it is more difficult to connect and avoid too many steel bars during installation, which not only increases the amount of on-site construction, but also reduces the construction efficiency. In actual application, the end of the first longitudinal reinforcement in the utility model is horizontally bent along the thickness direction of the precast beam body, and by bending during the prefabrication process, the amount of steel bars increased due to parallel staggered is effectively reduced, and the rework and material waste caused by steel bar conflicts are also reduced, which reduces the construction cost as a whole, reduces the weight of the component while ensuring the overall strength and rigidity of the prefabrication, and effectively reduces the workload of on-site steel bar processing and adjustment, greatly improving the construction efficiency.

[0008] 2. The bending design of the steel bar ends in the utility model helps to disperse stress concentration, especially at the ends of prefabricated beams, which can effectively reduce the occurrence of cracks and improve the crack resistance and fatigue life of prefabricated beams. At the same time, through reasonable layout, the force distribution of prefabricated beams can also be optimized to improve the stability and durability of the overall structure.

[0009] 3. The connection nodes between prefabricated beams and other components are the weak links of the overall structure. The utility model provides shear-resistant steel bars on the prefabricated beam body to enhance the shear strength of the connection nodes, reduce the generation of cracks, prevent shear damage to the structure when subjected to stress, and ensure the stability and safety of the building; at the same time, by designing and implementing shear-resistant measures in the prefabrication stage, it is possible to reduce on-site steel bar binding and processing work, simplify the installation process, speed up construction progress, and reduce construction costs. The size and quality of the prefabricated shear steel bar components in the factory can be strictly controlled during production. Compared with on-site construction, human errors are reduced, and precise matching between components and the overall quality of the structure are ensured.

[0010] Furthermore, when the assembled prefabricated beam serves as the main beam, an installation notch for connecting the secondary beam is opened on the prefabricated beam body, and only the concrete structure of the prefabricated beam body is removed at the installation notch.

[0011] 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 100 cm. In this scheme, the precast beam body is filled with complete and continuous steel bars, so that the overall strength and rigidity of the precast beam are relatively high. The width of the installation gap is only the thickness of the secondary beam. The installation gap is usually 20 cm. The number of steel bars in the main beam is generally eight. When the beam span length is the same, the amount of steel bars used at the installation gap in the prior art is 1600 cm, and more stirrups are required. In this scheme, the amount of steel bars used at the installation gap is 160 cm; while ensuring the overall connection strength of the main beam, the amount of steel bars used is reduced by at least 10 times, greatly reducing the production cost and construction cost.

[0012] Furthermore, the shear-resistant steel bar is an L-shaped steel bar, the bent portion of the L-shaped steel bar is located in the precast beam body, and the upper end of the L-shaped steel bar passes through the precast beam body upward to form an anchor bar.

[0013] In the above setting, L-shaped steel bars are embedded in the precast beams, which reduces the workload and time cost of on-site steel bar processing. The bent part forms an effective shear key inside the precast beam, which can effectively resist shear force and prevent the precast beams and adjacent structures from slipping in the vertical and horizontal directions, especially under earthquakes or wind loads, thereby enhancing the overall stability and seismic resistance of the structure. At the same time, precast beams with L-shaped shear bars are generally installed at the frame beam position of the building frame. The anchor bars of the L-shaped bars passing through the precast beam body play a positioning role when connected to the upper structure, and ensure the integration of the precast beams with the entire structural system, thereby improving the overall stiffness and bearing capacity of the structure.

[0014] Furthermore, the shear-resistant steel bars are U-shaped steel bars, and the open ends of the U-shaped steel bars are embedded in the prefabricated beam body.

[0015] Precast beams whose shear reinforcement is U-shaped reinforcement are generally installed in non-frame beam positions of building frames. The above-mentioned setting of U-shaped reinforcement embedded in the precast beam simplifies the on-site construction process and improves construction efficiency. The open end of the U-shaped reinforcement forms a stable shear key inside the precast beam, which can effectively resist shear force and prevent relative slippage between the beam and adjacent structural members under load. When the precast beam is connected to the floor slab, the U-shaped reinforcement and the floor slab reinforcement are effectively overlapped by welding, binding, etc., thereby realizing a rigid connection between the floor slab and the beam and enhancing the integrity of the structure.

[0016] Furthermore, a shear groove opening downward is provided at the bottom of the prefabricated beam body, and the cross section of the shear groove is trapezoidal.

[0017] The above arrangement allows the precast beam and sandwich wall to omit the process of connecting the steel plates during installation, making the installation easier. The shear groove design allows the precast beam to clamp and fix the sandwich wall on both sides, increasing the reliability of the connection and enhancing the shear resistance at the connection node. At the same time, the shear groove has a positioning function during construction, which is conducive to quickly finding the installation position during assembly and improving construction efficiency.

[0018] Furthermore, a plurality of strip grooves are evenly arranged on the top of the prefabricated beam body, and the surface roughness of the strip grooves is greater than the surface roughness of the prefabricated beam body.

[0019] The above arrangement improves the integrity and adhesion between new and old concrete in the connection nodes formed by the precast beams and other components, increases the strength and rigidity of the connection nodes, and improves the quality of building assembly.

[0020] Furthermore, both ends of the longitudinal reinforcement passing through the prefabricated beam body are sleeved with anchor plates.

[0021] The combination of anchor plates and avoidance steel bars overcomes the problem of difficult placement of precast beams and large adjustment amount during installation due to crowded anchorage of traditional L-shaped bent bars. On the other hand, it effectively avoids the problem of difficulty in vibration due to excessive steel bars during concrete pouring, improves the forming quality of the connection nodes between precast beams and other components, and at the same time reduces the length of the end anchor steel bars, saving steel and reducing costs.

[0022] Furthermore, a hoisting groove is provided at the top of the prefabricated beam body, a hoisting member is installed in the hoisting groove, and a plane where the top of the hoisting member is located is lower than the upper surface of the prefabricated beam body.

[0023] The above arrangement enables the upper end of the lifting component to be lower than the upper surface of the prefabricated beam. After transportation and installation, there is no need to cut and repair the protruding part of the lifting component, which reduces the construction workload and improves the construction efficiency.

[0024] Furthermore, an integrated wire tube is embedded in the precast beam body, the end of the integrated wire tube is flush with the outermost surface of the precast beam body, and a hand hole groove is opened at the end of the integrated wire tube in the precast beam body, and the end of the integrated wire tube is located in the hand hole groove.

[0025] In the above-mentioned setting, the end of the integrated wire pipe is flush with the outermost surface of the prefabricated beam body to avoid possible damage to the integrated wire pipe such as collision and extrusion during construction, so as to extend the service life of the integrated wire pipe; a hand hole groove is opened at the end of the integrated wire pipe to allow for greater adjustment space when assembling the integrated wire pipe between the prefabricated beam and floor slabs, wall panels and other components, so as to facilitate flexible adjustment according to actual construction conditions.

[0026] Furthermore, a bolt sleeve for fixing the adjustable supporting device is pre-embedded in the upper part of the side surface of the prefabricated beam body.

[0027] The above-mentioned adjustable support device is independently developed by the applicant, and its support height is adjustable. When horizontal components such as floor slabs are installed on the prefabricated beam, the bolt sleeve and the bolt cooperate to quickly fix the adjustable support device on the prefabricated beam, and there is no need to set up scaffolding to support the floor slab, thereby reducing the construction process of scaffolding erection and disassembly, greatly improving the construction efficiency, and after the floor slab construction is completed, the adjustable support device can be removed from the bolt sleeve and reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of the first embodiment of the present utility model.

[0029] Figure 2 This is a schematic structural diagram of the avoidance steel bars of the first longitudinal reinforcement in Example 1 of the utility model.

[0030] Figure 3 This is a schematic diagram of the structure of an L-shaped steel bar in Embodiment 1 of the present utility model.

[0031] Figure 4 for Figure 3 Schematic diagram of the cross section along AA.

[0032] Figure 5 It is a schematic structural diagram of the U-shaped steel bar in the first embodiment of the utility model.

[0033] Figure 6 This is a schematic diagram of the structure of the hanging component in the prefabricated beam in the first embodiment of the utility model (the structure after removing the longitudinal reinforcement). DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods:

[0035] The figure marks in the drawings of the specification include: precast beam body 1, longitudinal steel bars 2, first longitudinal bars 21, first horizontal longitudinal bars 211, second horizontal longitudinal bars 212, avoidance steel bars 213, anchor plates 3, L-shaped steel bars 4, anchor bars 41, U-shaped steel bars 5, shear grooves 6, lifting grooves 7, lifting parts 8, and bolt sleeves 9.

[0036] Embodiment 1

[0037] One-piece prefabricated beams, such as Figure 1-Figure 3As shown in the combination, it includes a precast beam body 1, and a plurality of rows of longitudinal steel bars 2 are arranged in the precast beam body 1 along its height direction. The longitudinal steel bars 2 include first longitudinal bars 21 located at the upper and lower ends of the precast beam body 1, and the first longitudinal bars 21 include first horizontal longitudinal bars 211 and second horizontal longitudinal bars 212 located at both ends of the first horizontal longitudinal bars 211. Each second horizontal longitudinal bar 212 passes through the precast beam body 1 and remains parallel to each other. A avoidance steel bar 213 for connecting the first horizontal longitudinal bar 211 and the second horizontal longitudinal bar 212 is arranged between the first horizontal longitudinal bar 211 and the second horizontal longitudinal bar 212. The avoidance steel bar 213 is bent in the horizontal direction along the thickness direction of the precast beam body 1, and the avoidance steel bar 213 makes the first horizontal longitudinal bar 211 and the second horizontal longitudinal bar 212 parallel to each other. The longitudinal reinforcement 211 and the second horizontal longitudinal reinforcement 212 are offset in the horizontal direction, and the specific bending direction of the avoidance reinforcement 213 is designed according to the actual structure of the house; both ends of the first longitudinal reinforcement 21 passing through the precast beam body 1 are sleeved with anchor plates 3. The design of the anchor plate 3 and the avoidance reinforcement 213 overcomes the problem of crowded anchoring of traditional L-shaped bending bars, which makes it difficult to place the precast beam during installation and requires a large amount of adjustment. On the other hand, it effectively avoids the problem of difficulty in vibrating due to excessive reinforcement during concrete pouring, improves the forming quality of the connection nodes between the precast beam and other components, and at the same time reduces the length of the end anchor reinforcement, saves steel and reduces costs.

[0038] In order to improve the shear resistance of the precast beam as a whole, the precast beam body 1 is provided with shear reinforcement on its upper surface. The shear reinforcement has different forms according to the different positions of the precast beam, such as Figure 3 As shown, when the precast beam is located at the frame beam position of the building frame, the shear reinforcement is an L-shaped reinforcement 4, the bent portion of the L-shaped reinforcement 4 is located in the precast beam body 1, and the upper end of the L-shaped reinforcement 4 passes through the precast beam body 1 upward to form an anchoring bar 41. The anchoring bar 41 not only enhances the stability of the connection between the precast beam and the floor slab, but also cooperates with the reinforcement holes at the corresponding positions of the floor slab to facilitate rapid positioning during the installation of the floor slab; Figure 4 As shown, when the prefabricated beam is located at a non-frame beam position of the building frame, the shear reinforcement is a U-shaped reinforcement 5, and the open end of the U-shaped reinforcement 5 is embedded downward in the prefabricated beam body 1.

[0039] Furthermore, in order to improve the strength and stiffness of the connection nodes between the precast beams and the wall panel components, Figure 5 As shown, a shear groove 6 opening downward is provided at the bottom of the precast beam body 1, and the shear groove 6 runs through the length direction of the precast beam body 1. The cross section of the shear groove 6 is trapezoidal, and the shear groove 6 also has a positioning function, which is conducive to quickly finding the installation position during assembly and improving construction efficiency; the precast beam body 1 is also evenly provided with a plurality of strip grooves (not shown in the figure) on the top, and the surface roughness of the strip grooves is greater than the surface roughness of the precast beam body 1, so as to increase the integrity and bonding strength between the new and old concrete.

[0040] like Figure 3 and Figure 6As shown in the figure, the prefabricated beam body 1 has a lifting groove 7 at the top, the lifting groove 7 is arc-shaped, and a lifting member 8 is installed in the lifting groove 7. The plane where the top of the lifting member 8 is located is lower than the upper surface of the prefabricated beam body 1, so as to reduce the steps of cutting and repairing the lifting member 8 after the prefabricated beam is lifted, save construction time and ensure construction quality.

[0041] Embodiment 2

[0042] When the assembled precast beam acts as the main beam, an installation notch for connecting the secondary beam is opened on the precast beam body 1. Only the concrete structure of the precast beam body 1 is removed at the installation notch. The main beam and the secondary beam are surrounded by a post-cast strip at the installation notch. The first longitudinal reinforcement 21 of the secondary beam is inserted into the post-cast strip and cross-tied with the first longitudinal reinforcement 21 of the main beam. Then, concrete is filled in the post-cast strip. When the concrete solidifies, the main beam and the secondary beam are connected together.

[0043] Embodiment 3

[0044] In order to ensure the convenient construction of the remaining processes after the installation of the precast beam, an integrated wire pipe is embedded in the precast beam body 1. The end of the integrated wire pipe is flush with the outermost surface of the precast beam body 1, and the precast beam body 1 is provided with a hand hole groove at the end of the integrated wire pipe. The end of the integrated wire pipe is located in the hand hole groove, which is convenient for the assembly of the integrated wire pipe between the floor slab component or the wall panel component and the precast beam, and can be flexibly adjusted according to actual conditions.

[0045] like Figure 1 As shown, a bolt sleeve 9 is also embedded in the upper part of the side of the prefabricated beam body 1. The bolt sleeve 9 is detachably connected with an adjustable support device independently developed by the applicant. The adjustable support device includes a fixed plate and a support unit. The fixed plate is provided with two connection holes and a connecting piece is welded thereon. The connecting piece is vertically provided with a mounting hole. The support unit includes a support plate and a support rod welded to the bottom of the support plate. The support rod is threaded with an adjustment nut, and the support rod is inserted into the mounting hole. When the floor slab is installed on this prefabricated beam, the adjustable support device is fixed on the prefabricated beam by passing the bolt through the connection hole of the adjustable support device and threadedly fixed on the bolt sleeve 9. Then the floor slab is placed on the adjustable support device for support. When the horizontal height of the floor slab needs to be adjusted, the adjustment nut can be screwed with a wrench. In this way, there is no need to set up a scaffold to support the floor slab, thereby reducing the construction process of setting up and disassembling the scaffold, and greatly improving the construction efficiency. At the same time, after the construction of the floor slab is completed, the adjustable support device can be removed from the bolt sleeve 9 for reuse.

[0046] 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. An integrated assembled prefabricated beam, comprising a prefabricated beam body, wherein the prefabricated beam body is provided with a plurality of rows of longitudinal steel bars along its height direction, characterized in that: The longitudinal reinforcement includes first longitudinal reinforcement located at the upper and lower ends of the precast beam body, the two ends of the first longitudinal reinforcement pass through the precast beam body and are horizontally bent along the thickness direction of the precast beam body, and the ends of each first longitudinal reinforcement passing through the precast beam body are parallel to each other; the precast beam body is provided with shear reinforcement on its upper surface.

2. The integrated prefabricated beam according to claim 1, characterized in that: When the assembled prefabricated beam serves as the main beam, an installation notch for connecting the secondary beam is opened on the prefabricated beam body, and only the concrete structure of the prefabricated beam body is removed at the installation notch.

3. The integrated prefabricated beam according to claim 2, characterized in that: The shear-resistant steel bars are L-shaped steel bars, the bent portion of the L-shaped steel bars is located in the precast beam body, and the upper end of the L-shaped steel bars passes through the precast beam body upward to form anchor bars.

4. The integrated prefabricated beam according to claim 2, characterized in that: The shear-resistant steel bars are U-shaped steel bars, and the open ends of the U-shaped steel bars are pre-buried in the prefabricated beam body.

5. The integrated prefabricated beam according to any one of claims 1 to 4, characterized in that: A shear groove opening downward is provided at the bottom of the prefabricated beam body, and the cross section of the shear groove is trapezoidal.

6. The integrated prefabricated beam according to claim 5, characterized in that: A plurality of strip grooves are evenly arranged on the top of the prefabricated beam body, and the surface roughness of the strip grooves is greater than the surface roughness of the prefabricated beam body.

7. The integrated prefabricated beam according to claim 6, characterized in that: Both ends of the longitudinal reinforcement passing through the prefabricated beam body are sleeved with anchor plates.

8. The integrated prefabricated beam according to claim 7, characterized in that: A hoisting groove is provided on the top of the prefabricated beam body, a hoisting member is installed in the hoisting groove, and a plane where the top of the hoisting member is located is lower than the upper surface of the prefabricated beam body.

9. The integrated prefabricated beam according to claim 8, characterized in that: An integrated wire tube is embedded in the precast beam body, and the end of the integrated wire tube is flush with the outermost surface of the precast beam body. The precast beam body is provided with a hand hole groove at the end of the integrated wire tube, and the end of the integrated wire tube is located in the hand hole groove.

10. The integrated prefabricated beam according to claim 9, characterized in that: A bolt sleeve for fixing the adjustable supporting device is pre-embedded in the prefabricated beam body.

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