Cast-in-situ composite beam structure

Abstract

The utility model discloses a cast-in-place composite beam structure, include: pre -buried shear reinforcement, it is equipped with multiple sets, and with multiple sets of pre -buried protection mechanism corresponds, multiple pre -buried shear reinforcement corresponding activity is inserted in the corresponding pre -buried protection mechanism, the utility model discloses the setting of pre -buried shear reinforcement, pre -buried shear reinforcement is bonded and is installed in the prefabricated beam, can be tensioned in the construction stage to promote the rigidity and the crack resistance of prefabricated beam, after the strength of the upper cast-in-place concrete reaches, tension the prestressed reinforcement again, make it to whole cross -section and exert prestress, form high -performance composite beam, and the weight reduction is remarkable, and the prefabricated part is only about 1 / 3 weight of complete beam, greatly reduced the transportation and hoisting difficulty and cost, can reduce to the support support, can be self -supporting after the first stage tension, reduce a large amount of scaffold and temporary support, save the measure cost and shorten the construction period, the controllable construction stress, the stress and deformation of initiative adjustment beam, the construction process is safer, and the quality is higher.

Description

Technical Field

[0001] This utility model relates to the field of precast beam technology, specifically a cast-in-place composite beam structure. Background Technology

[0002] Traditional prestressed composite beams are mainly divided into two categories: fully precast and cast-in-place monolithic. While fully precast prestressed beams offer high quality and fast construction, their heavy weight makes transportation and hoisting difficult, and the fixed stress state throughout construction makes optimization impossible. Cast-in-place monolithic composite beams offer good integrity, but suffer from low stiffness and cracking issues during the hoisting of the precast portion and before the cast-in-place concrete sets, requiring extensive temporary supports and making construction cumbersome. The core deficiency of existing technologies lies in the fact that the stress state of precast beams is passive and unadjustable from hoisting to forming a unified load-bearing structure, easily leading to the phenomenon of "fat beams and thick columns," where material efficiency is not fully utilized. Therefore, we need to propose a cast-in-place composite beam structure. Utility Model Content

[0003] The purpose of this invention is to provide a cast-in-place composite beam structure to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A cast-in-place composite beam structure includes: a precast beam body with multiple sets of connecting steel bars inside; multiple sets of embedded protective mechanisms evenly arranged inside the precast beam body; and multiple sets of embedded shear steel bars corresponding to the multiple sets of embedded protective mechanisms, wherein the multiple sets of embedded shear steel bars are movably inserted into the corresponding embedded protective mechanisms.

[0005] Preferably, the pre-embedded protective mechanism includes a pre-embedded base and a hollow tube; The hollow tube is provided in two sets, and the two sets of hollow tubes are symmetrically inserted into the embedded base. The embedded base has an installation cavity, the lower end of the hollow tube is located in the installation cavity, the embedded shear reinforcement is located in the installation cavity, and the two sets of hollow tubes are sleeved on the embedded shear reinforcement.

[0006] Preferably, the embedded seat is located inside the precast beam and below the connecting steel bars.

[0007] Preferably, the hollow tube has a clearance groove, and the pre-embedded shear reinforcement is located inside the clearance groove.

[0008] Preferably, the upper end of the hollow tube is fixedly connected to an aggregate block, which is used to allow subsequent concrete pouring to enter the embedded base and fix the embedded shear reinforcement.

[0009] Preferably, the aggregate block is cone-shaped, and the top of the aggregate block extends above the precast beam.

[0010] Preferably, multiple sets of blocks corresponding to the aggregate blocks are fixedly connected to the pre-embedded shear reinforcement. The blocks are located inside the aggregate blocks and are used to seal the aggregate blocks to prevent concrete from entering the pre-embedded base when the precast beam is made.

[0011] Preferably, the stop block is adapted to the inner wall of the aggregate block, and the surface of the stop block is in contact with the inner wall of the aggregate block.

[0012] Preferably, the pre-embedded base has a through hole corresponding to the hollow tube, and the through hole has an installation groove inside, which is fitted onto the hollow tube.

[0013] Preferably, the structure also includes multiple sets of stirrups, all of which are located inside the precast beam, and the connecting steel bars are fixed to the stirrups by fasteners.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This invention utilizes pre-embedded shear reinforcement bars, which are installed unbonded within the precast beam. These bars can be tensioned during construction to enhance the beam's stiffness and crack resistance. After the upper cast-in-place concrete reaches its strength, the prestressed tendons are tensioned again, applying prestress to the entire cross-section to form a high-performance composite beam. Furthermore, it significantly reduces weight, with the precast portion weighing only about one-third of the complete beam. This greatly reduces transportation and hoisting difficulties and costs, minimizes the need for supports, and allows the beam to bear its own weight after the first stage of tensioning, reducing scaffolding and temporary supports, saving on construction costs and shortening the construction period. Controllable construction stress allows for proactive adjustment of beam stress and deformation, resulting in safer and higher-quality construction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the pre-embedded protective mechanism of this utility model; Figure 4 This is a schematic diagram of the hollow tube structure of this utility model.

[0016] In the diagram: 1. Precast beam; 2. Connecting reinforcement; 3. Stirrups; 4. Fixtures; 5. Embedded shear reinforcement; 6. Embedded protective mechanism; 61. Embedded seat; 62. Installation cavity; 63. Clearance groove; 64. Hollow tube; 65. Aggregate block; 66. Stop block; 7. Installation groove; 8. Through hole; 9. Sealing ring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-4 This utility model provides a technical solution: A cast-in-place composite beam structure includes: a precast beam body 1, which has multiple sets of connecting steel bars 2 inside; a pre-embedded protective mechanism 6, which has multiple sets, and the multiple sets of pre-embedded protective mechanisms 6 are evenly arranged inside the precast beam body 1; and pre-embedded shear steel bars 5, which have multiple sets and correspond to the multiple sets of pre-embedded protective mechanisms 6, and the multiple sets of pre-embedded shear steel bars 5 are correspondingly and movably inserted into the corresponding pre-embedded protective mechanisms 6.

[0019] It should be noted that the precast beam 1 serves as the foundation of the entire cast-in-place composite beam structure, bearing the initial load and providing strong support for subsequent construction and structural stability. The connecting steel bars not only enhance the integrity of the precast beam 1 itself, but also provide reliable nodes for subsequent connections with other components. Furthermore, the connecting steel bars 2 effectively transfer stress, enabling the precast beam 1 to form a cohesive whole under load, preventing localized damage. In the event of natural disasters such as earthquakes, the connecting steel bars 2 play a crucial role in evenly distributing seismic forces across the entire precast beam 1, thereby improving the structure's seismic performance. Because the upper two-thirds of the precast beam is not poured with concrete, its weight is significantly reduced, a design feature that greatly facilitates transportation and hoisting. During transport, the lighter precast beams can be transported using smaller vehicles, reducing transportation costs and route requirements. They can also pass smoothly over narrow roads or bridges, minimizing transportation difficulties caused by road conditions. Smaller transport vehicles are more maneuverable and better adaptable to complex road conditions, improving transportation safety and efficiency. In the hoisting phase, the lighter precast beams allow for a wider variety of hoisting equipment options, reducing the difficulty and risk of the operation. Smaller cranes can easily handle the task, saving on the cost of renting large hoisting equipment and minimizing space requirements. In confined construction sites, smaller cranes offer greater flexibility, facilitating the hoisting of precast beams. The lighter precast beams also provide greater stability during hoisting, reducing safety hazards caused by beam swaying and improving overall safety. Furthermore, the wider range of hoisting equipment options allows for cost savings on renting large hoisting equipment.

[0020] In an optional embodiment: such as Figure 2 and Figure 3 As shown, the pre-embedded protective mechanism 6 includes a pre-embedded base 61 and a hollow tube 64; Two sets of hollow tubes 64 are provided, and the two sets of hollow tubes 64 are symmetrically inserted into the pre-embedded base 61. The pre-embedded base 61 has an installation cavity 62. The lower end of the hollow tube 64 is located in the installation cavity 62. The pre-embedded shear reinforcement 5 is located in the installation cavity 62, and the two sets of hollow tubes 64 are sleeved on the pre-embedded shear reinforcement 5.

[0021] It should be noted that the embedded seat 61 is made of high-strength material and has good stability and load-bearing capacity. The embedded seat 61 and the hollow tube 64 together provide reliable protection and installation conditions for the embedded shear reinforcement 5. After the embedded shear reinforcement 5 is installed in the hollow tube 64 and the embedded seat 61, the embedded shear reinforcement 5 can move and slide freely in the embedded seat 61 and the hollow tube 64. The inner diameter of the hollow tube 64 is larger than the diameter of the embedded shear reinforcement 5, so that when the cast-in-place part of the precast beam 1 is poured, the concrete can enter the embedded seat 61 through the gap between the embedded shear reinforcement 5 and the hollow tube 64.

[0022] In an optional embodiment: such as Figure 2 As shown, the embedded seat 61 is located inside the precast beam 1 and below the connecting steel bar 2.

[0023] It should be noted that by placing the embedded seat 61 below the connecting steel bar 2, it can be ensured that when the precast beam 1 is hoisted by the embedded shear steel bar 5, the force of the embedded seat 61 can be directly applied to the connecting steel bar 2, thereby providing stable support for the entire precast beam 1 through the connecting steel bar 2.

[0024] In an optional embodiment: such as Figure 3 and Figure 4 As shown, the hollow tube 64 is provided with a relief groove 63, and the pre-embedded shear reinforcement 5 is located inside the relief groove 63.

[0025] It should be noted that, through the setting of the clearance groove 63, the pre-embedded shear reinforcement 5 moves within the clearance groove 63 when the precast beam 1 is hoisted.

[0026] In an optional embodiment: such as Figure 3 and Figure 4 As shown, the upper end of the hollow tube 64 is fixedly connected to an aggregate block 65, which is used to allow subsequent concrete pouring to enter the embedded base 61 to fix the embedded shear reinforcement 5.

[0027] It should be noted that by setting the aggregate block 65, when pouring the cast-in-place part of the precast beam 1, the conical aggregate block 65 facilitates the concrete to enter the interior of the embedded seat 61 through the aggregate block 65 and the hollow tube 64. After the concrete solidifies in the embedded seat 61 and the hollow tube 64, it fixes the embedded shear reinforcement 5 and improves the stability of the embedded shear reinforcement 5.

[0028] In an optional embodiment: such as Figure 3 and Figure 4 As shown, the aggregate block 65 is cone-shaped, and the top of the aggregate block 65 extends above the precast beam 1.

[0029] It should be noted that by extending the top of the aggregate block 65 to the top of the precast beam 1, it can prevent concrete from entering the embedded seat 61 through the hollow pipe 64 and solidifying inside the embedded seat 61 and the hollow pipe 64 during the pouring of the precast beam 1, thus affecting the movement of the embedded shear reinforcement 5.

[0030] In an optional embodiment: such as Figure 3 As shown, multiple sets of baffles 66 corresponding to the aggregate block 65 are fixedly connected to the pre-embedded shear steel bar 5. The baffles 66 are located inside the aggregate block 65 and are used to seal the aggregate block 65 to prevent concrete from entering the pre-embedded seat 61 when the precast beam is made.

[0031] It should be noted that the setting of the stop block 66 serves to block the aggregate block 65, which can prevent concrete from splashing into the aggregate block 65 and the embedded seat 61 when the precast beam 1 is poured.

[0032] In an optional embodiment: such as Figure 3 and Figure 4 As shown, the stop block 66 is adapted to the inner wall of the aggregate block 65, and the surface of the stop block 66 is in contact with the inner wall of the aggregate block 65.

[0033] It should be noted that after the stop block 66 is installed inside the aggregate block 65, it can support and position the embedded shear reinforcement 5, thereby improving the stability of the embedded shear reinforcement 5.

[0034] In an optional embodiment: such as Figure 3 As shown, the pre-embedded base 61 has a through hole 8 corresponding to the hollow tube 64, and the through hole 8 has an installation groove 7 inside, which is fitted onto the hollow tube 64.

[0035] It should be noted that the installation groove 7 is designed to seal the through hole 8 between the hollow tube 64 and the embedded seat 61, preventing concrete from entering the embedded seat 61. The hollow tube 64 is inserted into the pre-embedded base 61, and the height of the hollow tube 64 and the aggregate block 65 can be adjusted as needed.

[0036] In an optional embodiment: such as Figure 1 and Figure 2 As shown, it also includes multiple sets of stirrups 3, all of which are located inside the precast beam 1. The connecting steel bars 2 are fixed to the stirrups 3 by fasteners 4.

[0037] It should be noted that the fastener 4 is a connecting wire, serving a connecting function, so that the connecting steel bar 2 can be firmly fixed to the stirrup 3. Through the setting of the stirrup 3, the stirrup 3 can effectively restrict the lateral deformation of the concrete and improve the seismic performance of the component. During an earthquake, the stirrup 3 can restrain the concrete, making it less prone to shear failure under stress, thereby greatly improving the seismic resistance of the building.

[0038] The usage process of this utility model is as follows: multiple sets of pre-embedded protective mechanisms 6 are placed between multiple sets of stirrups 3, connecting steel bars 2 are placed on the stirrups 3, and the connecting steel bars 2 and stirrups 3 are fixed by fasteners 4. Tensioning and anchoring are performed, and concrete is poured to solidify the concrete and form a precast beam, which forms the main load-bearing part of the precast beam. The precast beam serves as the formwork and support for the cast-in-place beam, resulting in significant weight reduction. The precast part is only about 1 / 3 the weight of the complete beam, greatly reducing the difficulty and cost of transportation and hoisting. It also reduces the need for support, as it can bear its own weight after the first stage of tensioning, reducing or even eliminating a large amount of scaffolding and temporary support, saving on measures and shortening the construction period. The controllable construction stress allows for active adjustment of the beam's stress and deformation, making the construction process safer and of higher quality. Five shear-resistant steel bars are embedded to ensure that the precast and cast-in-place parts work together completely; efficient prestressing is applied to the entire cross section, the material properties are fully utilized, the structure has small deflection, strong crack control ability and high load-bearing capacity.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cast-in-place composite beam structure, characterized in that, include: The precast beam has multiple sets of connecting steel bars inside; The pre-embedded protective mechanism is provided in multiple sets, and the multiple sets of the pre-embedded protective mechanism are evenly arranged inside the precast beam; The pre-embedded shear reinforcement is provided in multiple sets, and corresponds to multiple sets of pre-embedded protective mechanisms. The multiple sets of pre-embedded shear reinforcement are movably inserted into the corresponding pre-embedded protective mechanisms.

2. The cast-in-place composite beam structure according to claim 1, characterized in that: The embedded protective mechanism includes an embedded base and a hollow tube; The hollow tube is provided in two sets, and the two sets of hollow tubes are symmetrically inserted into the embedded base. The embedded base has an installation cavity, the lower end of the hollow tube is located in the installation cavity, the embedded shear reinforcement is located in the installation cavity, and the two sets of hollow tubes are sleeved on the embedded shear reinforcement.

3. A cast-in-place composite beam structure according to claim 2, characterized in that: The embedded seat is located inside the precast beam and below the connecting steel bars.

4. A cast-in-place composite beam structure according to claim 2, characterized in that: The hollow tube has a clearance groove, and the pre-embedded shear reinforcement is located inside the clearance groove.

5. A cast-in-place composite beam structure according to claim 2, characterized in that: The upper end of the hollow tube is fixedly connected to an aggregate block, which is used to allow subsequent concrete pouring to enter the embedded base and fix the embedded shear reinforcement.

6. A cast-in-place composite beam structure according to claim 5, characterized in that: The aggregate blocks are cone-shaped, and the top of the aggregate blocks extends above the precast beam.

7. A cast-in-place composite beam structure according to claim 6, characterized in that: Multiple sets of blocks corresponding to the aggregate blocks are fixedly connected to the pre-embedded shear reinforcement. The blocks are located inside the aggregate blocks and are used to seal the aggregate blocks to prevent concrete from entering the pre-embedded base when the precast beam is made.

8. A cast-in-place composite beam structure according to claim 7, characterized in that: The stop block is adapted to the inner wall of the aggregate block, and the surface of the stop block is in contact with the inner wall of the aggregate block.

9. A cast-in-place composite beam structure according to claim 8, characterized in that: The embedded base has a through hole corresponding to the hollow tube, and the inside of the through hole has an installation groove. The embedded base is sleeved on the hollow tube.

10. A cast-in-place composite beam structure according to claim 1, characterized in that: It also includes multiple sets of stirrups, all of which are located inside the precast beam, and the connecting steel bars are fixed to the stirrups by fasteners.

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