Prefabricated structure free-out-joint composite beam structure

Abstract

The utility model relates to a kind of assembled structure free to out of muscle composite beam structure, including prefabricated beam, and the beam top composite layer shear stirrup is equipped in prefabricated beam;Prefabricated beam top is laid with beam top composite cast-in-place layer, and beam top composite cast-in-place layer is equipped with beam upper part longitudinal reinforcement along the longitudinal direction of prefabricated beam in, and beam upper part longitudinal reinforcement is respectively connected with the both ends of beam top composite layer shear stirrup;The inside of prefabricated beam bottom is fixedly connected with multiple beam lower part longitudinal reinforcement along its longitudinal direction, and multiple beam lower part longitudinal reinforcement is interval and is separately arranged in prefabricated beam bottom, and the both ends of each beam lower part longitudinal reinforcement are fixedly connected with the A level sleeve embedded in beam end bottom;The both ends of prefabricated beam are equipped with beam end rebate, and beam end key groove is formed in the inside concave of the outer side surface of beam end rebate.The utility model realizes the construction of free formwork, less support, greatly reduces the field wet operation, improves the degree of component factory production, and simultaneously solves the technical problems of poor integrity of beam-column joint and difficult beam-slab collaborative stress.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering technology, and in particular relates to a prefabricated composite beam structure that does not require exposed reinforcement. Background Technology

[0002] In the field of construction engineering, the traditional cast-in-place construction system has long suffered from problems such as low construction efficiency, difficulty in quality control, high resource consumption, and significant environmental pollution. Specifically, this manifests as: large on-site formwork requirements, long work cycles, and intensive labor input; complex concrete pouring environment, which easily leads to quality defects such as inadequate compaction and insufficient concrete cover thickness, directly affecting structural safety; low formwork turnover rate, resulting in serious waste of timber and steel; and the generation of large amounts of construction waste and dust during wet operations, which does not meet the requirements of green construction.

[0003] To address these issues, prefabricated building systems are being gradually promoted. However, existing conventional prefabricated technologies still face key bottlenecks: First, the integrity of connection nodes between beams, columns, slabs, and other components is insufficient. In particular, during the construction of cast-in-place sections in the core area of ​​beam-end pre-reinforced steel bars and column joints, the large amount of wet work and complex structure make it difficult to guarantee the construction quality of the joint area, directly affecting the seismic performance of the structure. Second, fully prefabricated beams are heavy, resulting in high transportation and hoisting costs and significant construction difficulties. Third, the connection methods between beams and slabs, and between beams and columns, cannot simultaneously balance construction convenience and structural integrity, highlighting contradictions such as the anchorage problem of negative bending moment reinforcement in floor slabs and insufficient beam-slab collaborative load-bearing performance.

[0004] Therefore, there is an urgent need to design an assembled precast beam to solve the technical problems faced by precast beams in the existing technology. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a prefabricated composite beam structure that eliminates the need for formwork and requires minimal support, significantly reducing on-site wet work, improving the degree of factory production of components, and solving the technical problems of poor overall integrity of beam-column joints and difficulty in beam-slab co-stressing.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A prefabricated composite beam structure without exposed reinforcement, the composite beam structure includes a precast beam, the precast beam is provided with a top composite layer of shear stirrups, the two ends of the top composite layer of shear stirrups extend to the top of the precast beam; The top of the precast beam is covered with a composite cast-in-place layer, and the top composite cast-in-place layer is provided with upper longitudinal reinforcement along the longitudinal direction of the precast beam. The upper longitudinal reinforcement is located in the shear stirrups of the top composite layer. Multiple lower longitudinal reinforcement bars are fixedly connected to the inner side of the bottom of the precast beam along its longitudinal direction. The multiple lower longitudinal reinforcement bars are spaced apart at the bottom of the precast beam, and each lower longitudinal reinforcement bar is fixedly connected to a Class A sleeve pre-embedded at the bottom of the beam end. Both ends of the precast beam are provided with beam end tongues, and the outer surface of the beam end tongue is concave to form a beam end keyway.

[0007] Preferably, the number of shear stirrups in the beam top composite layer is multiple, and the multiple beam top composite layer shear stirrups are arranged at intervals along the longitudinal direction of the precast beam and fixedly connected to the precast beam.

[0008] Preferably, the length of the Class A sleeve pre-embedded at the bottom of the beam end that protrudes outside the precast beam is 10~15mm.

[0009] Preferably, the two ends of the upper longitudinal reinforcement of the beam extend to the outer sides of both ends of the precast beam, and are used to insert into the first reserved grouting hole of the precast concrete column for grouting and anchoring connection.

[0010] Preferably, a detachable connecting bar is inserted into the Class A sleeve pre-embedded at the bottom of the beam end. The connecting bar is used to insert into the second reserved grouting hole of the precast concrete column and to make a grout anchor connection.

[0011] Preferably, the top two ends of the precast beam are symmetrically provided with pre-reserved hoisting bolt holes, and the pre-reserved hoisting bolt holes are internally threaded with post-installed hooks.

[0012] Preferably, the bottom ends of the precast beam are respectively provided with pre-drilled bracket bolt holes, and the bottom end of the precast beam near the precast concrete column contacts the top surface of the temporary fixing clamp on the precast concrete column. The pre-drilled bracket bolt holes at the bottom of the beam correspond to the fixing holes opened on the temporary fixing clamp.

[0013] Preferably, the two ends of the precast beam are also pre-drilled with reserved holes for installing beam-column joint grouting sealing plates.

[0014] Preferably, the composite cast-in-place layer at the top of the beam is made of concrete and steel reinforcement, and it is integrated with the precast beam as a whole through the upper longitudinal reinforcement of the beam and the shear stirrups of the composite layer at the top of the beam, forming a composite beam structure.

[0015] The technical effects and advantages of this utility model are as follows: 1. This application provides a prefabricated composite beam structure without exposed reinforcement. The prefabricated components have a high degree of standardization and strong quality control, solving the quality defects caused by the complex on-site casting environment. By adopting beam end keyways, beam end tongue and groove, and pre-embedded sleeve structure, formwork is eliminated and support is reduced, reducing on-site labor input by 80%, shortening the construction period by 20%, greatly improving construction efficiency, and significantly reducing on-site operation time. By designing the connecting bars of the upper longitudinal reinforcement of the beam and the pre-embedded Class A sleeves at the bottom of the beam end to be grouted and anchored to the reserved holes of the precast concrete column, combined with the shear stirrups of the composite layer at the top of the beam and the integral casting of the upper longitudinal reinforcement of the beam, the integrity and seismic performance of the beam-column and beam-slab connection are significantly enhanced.

[0016] 2. The prefabricated composite beam structure without exposed reinforcement provided in this application uses prefabricated components in the factory, which has a high degree of standardization and strong quality control. The composite layer uses matching floor decking, which eliminates the need for formwork and scaffolding and the need for turnover materials, thus meeting the overall goals of greening and low carbonization.

[0017] 3. The prefabricated composite beam structure without exposed reinforcement provided in this application uses pre-reserved ducts for post-grouting connection of the beam end reinforcement anchorage, which solves the problem that the core area of ​​the node is not able to be filled with concrete due to the excessive density of reinforcement, thus greatly reducing the safety of the node structure. In addition, the ICM grouting material used in conjunction with this application has the characteristics of high fluidity, high density and high strength, which makes it possible to use semi-dry post-grouting anchor connection. Such a node connection method has high integrity and fast construction progress. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model.

[0019] The following are the labeling elements in the diagram: 1. Precast beam; 2. Shear stirrups in the composite layer at the top of the beam; 3. Cast-in-place composite layer at the top of the beam; 4. Keyway at the beam end; 5. Class A sleeve pre-embedded at the bottom of the beam end; 6. Tongue and groove at the beam end; 7. Lower longitudinal reinforcement of the beam; 8. Upper longitudinal reinforcement of the beam; 9. ICM grouting material; 10. Precast concrete column; 11. First reserved grouting hole; 12. Connecting reinforcement; 13. Second reserved grouting hole; 14. Reserved hoisting bolt hole at the top of the beam; 15. Post-installation hook; 16. Reserved bracket bolt hole at the bottom of the beam; 17. Temporary fixing clamp; 18. Reserved hole for installation of grouting sealing plate at the beam-column joint. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the embodiments given in the accompanying drawings.

[0021] See Figure 1As shown, a prefabricated composite beam structure without exposed reinforcement is disclosed. The composite beam structure includes a precast beam 1, which has a top composite layer of shear reinforcement 2. The two ends of the top composite layer of shear reinforcement 2 extend to the top of the precast beam 1 and bend inwards to form an inverted "J" shape. A top composite cast-in-place layer 3 is laid on the top of the precast beam 1. The top composite cast-in-place layer 3 has upper longitudinal reinforcement 8 along the longitudinal direction of the precast beam 1. The upper longitudinal reinforcement 8 is located in the top composite layer of shear reinforcement. Multiple lower longitudinal reinforcement 7 are fixedly connected to the inner side of the bottom of the precast beam 1 along its longitudinal direction. The multiple lower longitudinal reinforcement 7 are spaced apart at the bottom of the precast beam 1, and both ends of each lower longitudinal reinforcement 7 are fixedly connected to a Class A sleeve 5 pre-embedded at the bottom of the beam end. Both ends of the precast beam 1 are provided with beam end tongue and groove 6. The outer surface of the beam end tongue and groove 6 is concave to form a beam end keyway 4.

[0022] It should be noted that the composite cast-in-place layer 3 at the top of the beam is made of concrete and steel reinforcement. It is integrated with the precast beam 1 as a whole through the upper longitudinal reinforcement 8 and the shear stirrups 2 of the composite layer at the top of the beam, forming a composite beam structure.

[0023] In this embodiment, the lower end of the precast beam 1 has a reserved A-grade sleeve 5 embedded at the bottom of the beam end. After the bottom connecting bar 12 is mechanically connected, it is then grouted and anchored to the reserved grouting hole of the precast concrete column 10. The gap between the precast beam 1 and the precast concrete column 10 is filled with ICM grout 9 and then cast into a whole to solve the problem of the integrity of the beam-column joint. The top of the precast beam 1 has a reserved beam top composite layer shear stirrup 2 and the upper longitudinal bar 8 of the beam are cast in one piece to solve the problem of the integrity of the beam and slab and the anchorage of the negative bending moment reinforcement of the floor slab.

[0024] In one embodiment, the number of shear stirrups 2 in the beam top composite layer is multiple, and the multiple shear stirrups 2 in the beam top composite layer are arranged along the longitudinal direction of the precast beam 1 and are fixedly connected to the precast beam 1 at intervals.

[0025] In practice, the number of shear stirrups 2 in the composite layer at the top of the beam can be 10, 11, or 12, and this number is not limited. The number of shear stirrups 2 in the composite layer at the top of the beam can be increased or decreased according to the design requirements so that the composite beam meets the bearing capacity requirements.

[0026] In one embodiment, the length of the Class A sleeve 5 pre-embedded at the bottom of the beam end that protrudes outside the precast beam 1 is 10~15mm.

[0027] In practice, the length of the Class A sleeve 5 pre-embedded at the bottom of the beam end that protrudes from the outside of the precast beam 1 can be 10mm, 13mm, or 15mm, but the overall exposed length is controlled within 10-15mm.

[0028] In one embodiment, see Figure 2As shown, the two ends of the upper longitudinal reinforcement 8 of the beam extend to the outer sides of both ends of the precast beam 1, and are used to insert into the first reserved grouting hole 11 of the precast concrete column 10 for grout anchoring connection. A detachable connecting reinforcement 12 is inserted into the Class A sleeve 5 pre-embedded at the bottom of the beam end. The connecting reinforcement 12 is used to insert into the second reserved grouting hole 13 of the precast concrete column 10 for grout anchoring connection.

[0029] In this embodiment, the composite beam structure is connected to the pre-reserved ducts of the precast concrete column 10 by the beam end reinforcement and grouting. The beam end is then grouted. The shear stirrups 2 of the composite layer at the top of the beam are integrated with the floor slab reinforcement. The connection node between the beam end and the precast concrete column 10 mainly bears the negative bending moment of the support and the tensile force of the upper reinforcement. The top of the beam is integrally cast with the slab reinforcement and mainly bears the bending moment, shear force and torque transmitted by the floor slab.

[0030] In one embodiment, the top of the precast beam 1 is symmetrically provided with pre-drilled bolt holes 14 at both ends. These pre-drilled bolt holes 14 are blind holes. A post-installed hook 15 is internally threaded into each pre-drilled bolt hole 14. One end of the post-installed hook 15 is a screw with threads on its surface, which facilitates connection and fixation with the pre-drilled bolt hole 14. The other end is a circular structure, which facilitates connection with the hoisting equipment and provides a good hoisting point for the hoisting equipment.

[0031] In one embodiment, the bottom ends of the precast beam 1 are respectively provided with pre-reserved bracket bolt holes 16. The bottom end of the precast beam 1 near the precast concrete column 10 is in contact with the top surface of the temporary fixing clamp 17 on the precast concrete column 10. The pre-reserved bracket bolt holes 16 on the bottom of the beam correspond to the fixing holes opened on the temporary fixing clamp 17.

[0032] In this embodiment, by setting up pre-reserved bracket bolt holes 16 at the bottom of the beam, the pre-reserved bracket bolt holes 16 at the bottom of the beam can be aligned with the fixing holes opened on the temporary fixing clamp 17 during the installation of the composite beam, and the composite beam can be temporarily fixed to the temporary fixing clamp 17 with bolts, which greatly improves the stability of the composite beam during installation.

[0033] In one embodiment, the two ends of the precast beam 1 are also pre-drilled with reserved holes 18 for installing beam-column joint grouting sealing plates. These reserved holes 18 allow for effective installation and fixation of the beam-column joint grouting sealing plates.

[0034] The construction method for prefabricated composite beam structures without exposed reinforcement provided in this application is as follows: First, insert the connecting bar 12 into the pre-embedded Class A sleeve 5 at the bottom of the beam end. Then, use hoisting to lift the composite beam to the target height, so that the exposed upper longitudinal bar 5 and the connecting bar 12 at one end of the composite beam correspond to the reserved grouting holes on the precast concrete column 10. Control the hoisting equipment to move the composite beam closer to the precast concrete column 10, so that the upper longitudinal bar 5 and the connecting bar 12 are inserted into the corresponding holes. Then, use grout anchoring to connect and fix the composite beam to the precast concrete column 10, thus completing the installation of the composite beam and the precast concrete column 10.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A prefabricated, reinforcement-free composite beam structure, characterized in that: The composite beam structure includes a precast beam (1), and the precast beam (1) is provided with a top composite layer shear stirrup (2). The two ends of the top composite layer shear stirrup (2) extend to the top of the precast beam (1) and bend inward to form an inverted "J" shape. The top of the precast beam (1) is covered with a beam top composite cast-in-place layer (3), and the beam top composite cast-in-place layer (3) is provided with upper longitudinal reinforcement (8) along the longitudinal direction of the precast beam (1). The upper longitudinal reinforcement (8) is located in the shear stirrups (2) of the beam top composite layer. The bottom inner side of the precast beam (1) is fixedly connected with multiple lower longitudinal bars (7) along its longitudinal direction. The multiple lower longitudinal bars (7) are spaced apart at the bottom of the precast beam (1), and each lower longitudinal bar (7) is fixedly connected to a Class A sleeve (5) pre-embedded at the bottom of the beam end. Both ends of the precast beam (1) are provided with beam end tongues (6), and the outer side of the beam end tongues (6) is recessed to form beam end keyways (4).

2. The prefabricated, reinforcement-free composite beam structure according to claim 1, characterized in that: The number of shear stirrups (2) in the composite layer at the top of the beam is multiple. The multiple shear stirrups (2) in the composite layer at the top of the beam are arranged along the longitudinal direction of the precast beam (1) and are fixedly connected to the precast beam (1) at intervals.

3. The prefabricated, reinforcement-free composite beam structure according to claim 1, characterized in that: The length of the Class A sleeve (5) pre-embedded at the bottom of the beam end that protrudes outside the precast beam (1) is 10~15mm.

4. The prefabricated, reinforcement-free composite beam structure according to claim 1, characterized in that: The two ends of the upper longitudinal reinforcement (8) of the beam extend to the outer sides of both ends of the precast beam (1) to be inserted into the first reserved grouting hole (11) of the precast concrete column (10) and to be grouted and anchored. The gap between the precast beam (1) and the precast concrete column (10) is filled with ICM grout (9) and then cast into a whole.

5. A prefabricated, reinforcement-free composite beam structure according to claim 4, characterized in that: The Class A sleeve (5) pre-embedded at the bottom of the beam end is mechanically connected to a detachable connecting bar (12). The connecting bar (12) is used to insert into the second reserved grouting hole (13) of the precast concrete column (10) and to make a grout anchor connection.

6. The prefabricated, reinforcement-free composite beam structure according to claim 1, characterized in that: The precast beam (1) has symmetrically opened pre-reserved hoisting bolt holes (14) at both ends of the top, and the pre-reserved hoisting bolt holes (14) are internally threaded with post-installed hooks (15).

7. A prefabricated, reinforcement-free composite beam structure according to claim 6, characterized in that: The bottom ends of the precast beam (1) are respectively provided with pre-reserved bracket bolt holes (16). The bottom end of the precast beam (1) near the precast concrete column (10) is in contact with the top surface of the temporary fixing clamp (17) on the precast concrete column (10). The pre-reserved bracket bolt holes (16) on the bottom of the beam correspond to the fixing holes opened on the temporary fixing clamp (17).

8. A prefabricated, reinforcement-free composite beam structure according to claim 7, characterized in that: The two ends of the precast beam (1) are also pre-drilled with reserved holes (18) for installing the beam-column joint grouting sealing plate.

9. A prefabricated, reinforcement-free composite beam structure according to claim 1, characterized in that: The composite cast-in-place layer (3) at the top of the beam is made of steel bars and concrete. It is combined with the precast beam (1) as a whole through the upper longitudinal reinforcement (8) and the shear stirrups (2) of the composite layer at the top of the beam to form a composite beam structure.

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