Fabricated wet joint structure formed by transversely connecting multiple T-shaped beams and construction method

Abstract

The invention belongs to the technical field of prefabricated bridge foundations. The fabricated wet joint structure comprises a T beam main body, and a plurality of first notches are formed in a flange plate corresponding to a lower-step wet joint of the T beam main body at intervals; a plurality of beam ribs arranged in the width direction of the fabricated wet joint are arranged below the fabricated wet joint in the length direction at intervals, and protruding blocks and second notches are correspondingly arranged on the end faces of the two ends of the fabricated wet joint; wherein the two T-beam main bodies are arranged in a spaced mode, the assembly type wet joint is arranged between the two T-beam main bodies, and the two ends of the beam rib are correspondingly connected into the first notches of the two T-beam main bodies in a lap joint mode; the fabricated wet joint is connected with the T-beam main body through prestress, and slurry is poured into the fabricated wet joint; every two adjacent assembly type wet joints are in lap joint through the corresponding protruding blocks and the corresponding second notches, and tenon-and-mortise type embedment is formed. And high-precision rapid splicing of prefabricated parts can be achieved, and the construction problem existing in traditional cast-in-place wet joints is solved.

Description

Technical Field

[0001] This application belongs to the technical field of precast bridge foundations, and particularly relates to an assembled wet joint structure and construction method for transverse connection of multiple T-beams. Background Art

[0002] As an innovative technology in modern bridge construction, precast and assembled reinforced concrete structures have become the mainstream direction of the industry's development due to their significant engineering advantages. This construction mode realizes the coordinated improvement of construction efficiency, engineering quality, and environmental benefits through the organic combination of factory prefabrication and on-site modular assembly. In terms of construction efficiency, precast components are mass-produced using a standardized production line, which can form a parallel project with bridge foundation construction and on-site hoisting operations, shortening the construction period by approximately 40% compared to traditional in-situ casting construction. In terms of quality control, the constant temperature and humidity curing environment and automated production equipment in the factory reduce the discreteness of concrete strength to within 5%, and the positioning accuracy of steel bars is controlled within the range of ±2mm, effectively avoiding quality fluctuations caused by human factors in on-site construction. In the dimension of sustainable development, the precast process can reduce more than 80% of on-site construction waste, reduce 60% of construction noise and dust pollution, and conform to the development concept of green construction. As the core force-transfer structure of this system, the wet joint undertakes key functions such as transverse load distribution of the bridge deck and strengthening of structural integrity. By rigidly connecting the flange plates of adjacent T-beams into a whole, it not only needs to transfer the transverse bending moment and shear force generated by vehicle loads, but also coordinate the cooperative deformation of multiple main girders, which has a decisive impact on the durability and load-bearing safety of the bridge structure.

[0003] However, there are still significant technical bottlenecks in traditional in-situ wet joint construction: Firstly, the steel bar project needs to complete the positioning and binding of dense steel bars in a narrow space. The wet joint part of a single-span bridge often involves more than 2,000 welding joints, resulting in low construction efficiency and prone to quality defects such as false welding and missed welding. Secondly, the formwork support needs to set up a suspension support system, and surface defects such as honeycombing and pockmarks often appear after formwork removal, with a rework rate as high as. More prominently, in coastal high-salt fog environments or northern freeze-thaw cycle regions, these construction defects will accelerate the structural deterioration, making the joint area become a weak link in the whole life cycle of the bridge. Therefore, how to break through the technical bottlenecks of wet joint construction and achieve the balanced optimization of industrialized construction and structural performance has become a topic for promoting the iterative upgrade of precast bridge technology. Summary of the Invention

[0004] Based on this, it is necessary to provide an assembled wet joint structure and construction method for transverse connection of multiple T-beams in view of the above technical problems.

[0005] In the first aspect, this application provides an assembled wet joint structure for transverse connection of multiple T-beams, including: The T-beam main body, the lower-stage wet joint of the T-beam main body, and a plurality of first notches are arranged at intervals on the corresponding flange plate; An assembled wet joint, a plurality of beam ribs arranged along its width direction are arranged at intervals below the length direction, and convex blocks and second notches are correspondingly arranged at both end faces of the assembled wet joint; wherein, the two T-beam main bodies are arranged at intervals, the assembled wet joint is arranged between the two T-beam main bodies, and both ends of the beam rib are respectively correspondingly lapped in the first notches of the two T-beam main bodies; the assembled wet joint and the T-beam main body are connected by prestress and grouted; two adjacent assembled wet joints are lapped through the convex blocks and the second notches to form a mortise and tenon type fitting.

[0006] In some implementable ways, the first notch at least includes a first-size first notch and a second-size first notch, wherein the first-size first notch is larger than the second-size first notch.

[0007] In some implementable ways, the size of the first-size first notch is twice that of the second-size first notch; a plurality of the second-size first notches are located between the two first-size first notches.

[0008] In some implementable ways, the first notches on the left and right sides of the T-beam main body are arranged staggeredly.

[0009] In some implementable ways, at both ends in the length direction of the assembled wet joint, there are beam ribs arranged along its width direction, so that the beam rib and the assembled wet joint form a right angle.

[0010] In some implementable ways, when two adjacent assembled wet joints are spliced, the beam ribs of the two adjacent assembled wet joints are placed in the first-size first notch.

[0011] In some implementable ways, the number of the convex blocks is multiple and arranged at intervals, the number of the second notches is the same as that of the convex blocks and the positions are corresponding; the convex blocks are located at the upper part of the end face of the assembled wet joint; the second groove is located at the upper part of the end face of the assembled wet joint, and the second groove is a right-angle groove.

[0012] In some implementable ways, at the upper-stage wet joint of the T-beam main body and at the width-direction end face of the assembled wet joint, extension steel bars are arranged.

[0013] In some implementable ways, both the first notch and the beam rib have prestressed ducts, and prestressed steel strands are inserted into the prestressed ducts to apply prestress, so that the two T-beam main bodies and the assembled wet joint form a precompression stress system.

[0014] In a second aspect, the present application provides a construction method for an assembled wet joint structure for transverse connection of multiple T-beams. The construction method includes: In the prefabrication stage of the T-beam main body, the T-beam main body is prefabricated into a stepped cross-section to form an upper-stage wet joint and a lower-stage wet joint. Along the beam length direction, staggered first notches are arranged at intervals on the flange plate corresponding to the lower-stage wet joint, and transverse prestressed ducts are embedded in the first notches. At the upper-stage wet joint of the stepped cross-section, extended ring-shaped steel bars are provided. For the assembled wet joint of the precast beam-slab composite structure, multiple beam ribs with prestressed ducts are arranged in the width direction, and bumps and second notches are constructed at both ends. When adjacent assembled wet joints are spliced, the bumps and the second notches form a mortise-and-tenon type fitting. After the prefabricated T-beam main body is hoisted into place, the assembled wet joint is hoisted between adjacent T-beam main bodies. Transversely for the assembled wet joint, the two ends of the beam rib are respectively correspondingly lapped in the first notches of the two T-beam main bodies to ensure that the prestressed ducts of the beam rib are aligned with the prestressed ducts of the T-beam main body. Longitudinally for the assembled wet joint, the bump or the second notch is used for mortise-and-tenon fitting with the adjacent assembled wet joint. After the transverse prestressed steel tendons of the T-beam main body and the assembled wet joint pass through the prestressed ducts, the tensioning is completed, and after the prestress system is anchored, grout is poured into the upper-stage wet joint and the joints of adjacent assembled wet joints.

[0015] Beneficial effects: An assembled wet joint structure for transverse connection of multiple T-beams includes: a T-beam main body, with a lower-stage wet joint on the T-beam main body, and a plurality of first notches are arranged at intervals on the corresponding flange plate; an assembled wet joint, with a plurality of beam ribs arranged along its width direction at intervals below the length direction, and convex blocks and second notches are correspondingly arranged at both end faces of the assembled wet joint; wherein, the two T-beam main bodies are arranged at intervals, the assembled wet joint is arranged between the two T-beam main bodies, and both ends of the beam rib are respectively lapped in the first notches of the two T-beam main bodies; the assembled wet joint is connected to the T-beam main body by prestress and grouted with slurry; two adjacent assembled wet joints are lapped through the convex blocks and the second notches to form a tenon-mortise type fitting. Through the above structure, high-precision and rapid assembly of precast components can be realized, and the construction problems existing in traditional cast-in-place wet joints can be solved. The assembled wet joint realizes the installation of modular components without adjustment through the precise alignment of the first notches preset on the T-beam main body and the beam ribs of the assembled wet joint, shortening the construction time of the wet joint of a single-span bridge. The mechanical fitting structure between the beam rib and the first notch forms a stable force transmission path. The convex blocks and the second notches arranged at both ends of the assembled wet joint constitute a tenon-mortise type connection, realizing the automatic alignment of adjacent wet joints. The high-strength slurry grouted on-site forms an integral body in the gaps of the precast components, not only ensuring the continuity of the structure, but also avoiding the construction period delay caused by the maintenance of cast-in-place concrete. Through the organic combination of factory prefabrication and on-site assembly, the influence of environmental factors on the construction quality of the wet joint is reduced, providing reliable technical support for the popularization and application of assembled bridges. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the traditional technology, the following will briefly introduce the drawings required to be used in the description of the embodiments or the traditional technology. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic cross-sectional view of the T-beam main body of an assembled wet joint structure for transverse connection of multiple T-beams in an embodiment; Figure 2 It is a schematic three-dimensional view of the T-beam main body of an assembled wet joint structure for transverse connection of multiple T-beams in an embodiment; Figure 3 It is a schematic structural view of an assembled wet joint of an assembled wet joint structure for transverse connection of multiple T-beams in an embodiment; Figure 4 It is a schematic three-dimensional view of an assembled wet joint of an assembled wet joint structure for transverse connection of multiple T-beams in an embodiment; Figure 5 Schematic diagram of longitudinal connection of adjacent precast wet joints of a precast wet joint structure for transverse connection of multiple T - beams in one embodiment; Figure 6 Schematic side view of the assembly of the T - beam main body and the precast wet joint of a precast wet joint structure for transverse connection of multiple T - beams in one embodiment; Figure 7 Schematic three - dimensional view of the assembly of the T - beam main body and the precast wet joint of a precast wet joint structure for transverse connection of multiple T - beams in one embodiment; Figure 8 Schematic diagram of longitudinal connection of precast wet joints of a precast wet joint structure for transverse connection of multiple T - beams in one embodiment; Figure 9 Schematic diagram after transverse prestressed connection between the precast wet joint structure and the precast T - beam main body of a precast wet joint structure for transverse connection of multiple T - beams in one embodiment; Figure 10 Schematic three - dimensional view after transverse prestressed connection between the precast wet joint structure and the precast T - beam main body of a precast wet joint structure for transverse connection of multiple T - beams in one embodiment; Figure 11 Schematic diagram after casting completion of the cast - in - place joint section between the precast wet joint structure and the precast T - beam main body of a precast wet joint structure for transverse connection of multiple T - beams in one embodiment; Figure 12 Schematic three - dimensional view after casting completion of the cast - in - place joint section between the precast wet joint structure and the precast T - beam main body of a precast wet joint structure for transverse connection of multiple T - beams in one embodiment.

[0018] Reference numerals: 1. T - beam main body; 11. Flange plate; 12. First notch of the first dimension; 13. First notch of the second dimension; 14. Upper - stage wet joint; 15. Lower - stage wet joint; 2. Precast wet joint; 21. Protrusion; 22. Second notch; 23. Beam rib; 31. Prestressing steel strand; 32. Prestressing duct; 4. Extended reinforcement. Detailed implementation manners

[0019] To facilitate the understanding of this application, the following will describe this application more comprehensively with reference to the relevant drawings. Embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] It can be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0022] Some of the terms related to this application are explained below for the purpose of understanding this application: A T-beam is a reinforced concrete or prestressed concrete beam with a cross-section in the shape of a "T", and is one of the most commonly used load-bearing members in bridge engineering.

[0023] The traditional wet joint structure of a T-beam is a cast-in-place reinforced concrete structure, and the cross-section of the wet joint is a rectangular cross-section. After the T-beam is installed in place, the cast-in-place wet joint concrete is poured by setting up a wet joint formwork. This application provides an assembled wet joint structure for the transverse connection of multiple T-beams. The cross-section of the wet joint is a stepped cross-section, and the transverse connection of the T-beam wet joint is realized through precast assembled wet joints, transverse prestressed steel tendons, and wet joint cast-in-place combined sections.

[0024] As Figures 1 to 12 shown, in a first aspect, this application provides an assembled wet joint structure for the transverse connection of multiple T-beams, including a T-beam main body 1 and an assembled wet joint 2.

[0025] Among them, for the T-beam main body 1, at the lower-step wet joint 15 of the T-beam main body 1, a plurality of first notches are arranged at intervals on the corresponding flange plate 11, and the intervals between the plurality of first notches can be equal.

[0026] Specifically, the first notch at least includes a first-size first notch 12 and a second-size first notch 13, where the first-size first notch 12 is larger than the second-size first notch 13. Further, the size of the first-size first notch 12 is twice that of the second-size first notch 13; a plurality of the second-size first notches 13 are located between two of the first-size first notches 12.

[0027] Through the above structure, the distance between the groove walls of the first-size first notch 12 is twice the distance between the groove walls of the second-size first notch 13. So that the first-size first notch 12 has a larger space to accommodate the bumps 21 of two assembled wet joints 2.

[0028] The T-beam main body 1 designs the traditional wet joint rectangular section into a stepped section, forming an upper-stage wet joint 14 and a lower-stage wet joint 15. Among them, a first notch is provided on the flange plate 11 corresponding to the lower-stage wet joint 15, and this notch is used to cooperate with the assembled wet joint 2 to form a fixed structure; preferably, the extended steel bars 4 in the bridge width direction of the upper-stage wet joint 14 are circular steel bars, which play a role in reinforcement.

[0029] In addition, the first notches on the left and right sides of the T-beam main body 1 are arranged staggeredly. The purpose is to solve the spatial conflict problem of the transverse prestressed steel bundle 31 and optimize the structural stress performance at the same time.

[0030] Specifically, the transverse prestressed steel bundle 31 needs to pass through the duct reserved in the flange plate 11 of the T-beam main body 1 (corresponding to the position of the first notch). If the first notches on the left and right sides are arranged in alignment, when the prestressed steel bundle 31 passes through the beam rib 23 of the T-beam main body 1, Figure 2 as shown in the figure, spatial intersection will occur, resulting in difficult tensioning or even impossible construction. The first notches on the left and right sides are arranged staggeredly along the beam length direction, so that the paths of the prestressed steel bundles 31 on both sides are staggered in the beam rib 23 to avoid cross interference.

[0031] In addition, the staggeredly arranged first notches also stagger the anchoring ends of the prestressed steel bundles 31 on the left and right sides (located at the intersection of the wing plate and the beam rib 23 of the T-beam main body 1), providing enough operating space for the tensioning equipment and avoiding tool collision. The staggeredly arranged prestressed steel bundles 31 can more evenly cover the transverse section of the beam body, reducing local stress concentration. The staggeredly arranged first notches and the prestressed steel bundles 31 form a spatial network stress system, enhancing the integrity and torsional stiffness of the transverse connection of the T-beam main body 1.

[0032] For the assembled wet joint 2, a plurality of beam ribs 23 arranged along its width direction are spaced at intervals below the length direction, and convex blocks 21 and second notches 22 are correspondingly arranged at both end faces of the assembled wet joint 2.

[0033] Specifically, the two T-beam main bodies 1 are arranged at intervals, the assembled wet joint 2 is arranged between the two T-beam main bodies 1, and both ends of the beam rib 23 are respectively correspondingly lapped in the first notches of the two T-beam main bodies 1; the assembled wet joint 2 and the T-beam main body 1 are connected by prestress and grouted; two adjacent assembled wet joints 2 are lapped through the convex block 21 and the second notch 22 to form a mortise and tenon type fitting.

[0034] It should be noted that the two ends of the assembled wet joint 2 in the length direction have beam ribs 23 arranged along the width direction thereof, so that the beam ribs 23 and the assembled wet joint 2 form a right angle. In this way, when two adjacent assembled wet joints 2 are spliced, the beam ribs 23 of one assembled wet joint 2 fit with the beam ribs 23 of the other assembled wet joint 2, and the end faces of the two assembled wet joints 2 also fit. After fitting, just two beam ribs 23 can be embedded in the first notch 12 of the first size, that is, the first notch 13 of the second size can accommodate the embedding of one beam rib 23, and the first notch 12 of the first size is twice the width of the first notch 13 of the second size. When two adjacent assembled wet joints 2 are spliced, the beam ribs 23 of the two adjacent assembled wet joints 2 are placed in the first notch 12 of the first size.

[0035] The design achieves precise splicing and efficient connection of adjacent wet joints by setting beam ribs 23 at both ends of the assembled wet joint 2, and matching the first size notch (width of double beam ribs 23) and the second size notch (width of single beam rib 23). The end beam ribs 23 of adjacent wet joints are arranged at right angles, and fit naturally during splicing, ensuring longitudinal alignment, avoiding manual adjustment, and improving construction efficiency. Since the first size notch can only accommodate double beam ribs 23, if a single wet joint is installed incorrectly (such as rotation or offset), it cannot be embedded, preventing construction errors and forming an error-proofing mechanism. In addition, two beam ribs 23 are embedded in the first size notch side by side to form an integral rib plate structure, which significantly improves the bending and shear resistance along the bridge direction and avoids the stress concentration problem of the single beam rib 23. After splicing, the end faces of the wet joints are completely fitted, and the load can be continuously transmitted through the beam ribs 23 and the cast-in-place concrete, improving the integrity of the structure.

[0036] It should also be noted that the number of the protrusions 21 of the assembled wet joint 2 is multiple and arranged at intervals, the number of the second notches 22 is the same as the number of the protrusions 21, and the positions are corresponding; the protrusions 21 are located on the upper end surface of the assembled wet joint 2; the second groove is located on the upper end surface of the assembled wet joint 2, and the second groove is a right-angle groove.

[0037] The design sets a plurality of spaced protrusions 21 on the upper end surface of the assembled wet joint 2, and correspondingly sets a right-angle groove-shaped second notch 22, so that a mechanical interlocking structure is formed when adjacent wet joints are spliced. The one-to-one matching of the protrusion 21 and the second notch 22 ensures automatic alignment when adjacent wet joints are spliced, reduces manual adjustment, and increases installation speed. Since the protrusion 21 must be completely embedded in the corresponding second notch 22, if the wet joint is rotated or offset, the splicing cannot be completed, avoiding installation errors. The plurality of spaced protrusions 21 form a multi-point fit with the notch, so that the longitudinal load is evenly transmitted and stress concentration is avoided. The second notch 22 is a right-angle groove (not a bevel or arc), which fits tightly with the right-angle surface of the protrusion 21, significantly improving the shear resistance of the joint.

[0038] In addition, the bumps 21 and the second notches 22 are located at the upper part of the wet joint end face. After splicing, a sealed space is formed to prevent the leakage of cast-in-place concrete and ensure the pouring quality of the joint section. The tight fitting of the bumps 21 and the notches can replace part of the formwork function and reduce the sealing difficulty of the cast-in-place construction.

[0039] The intervals between the bumps 21 and the second notches 22 are evenly arranged, which is convenient for standardized prefabrication in the factory and reduces the complexity of the mold. By adjusting the number and spacing of the bumps 21, the T-beams with different spans can be flexibly adapted, enhancing the design versatility. Exemplarily, the bump 21 can be an I-beam.

[0040] In one embodiment, the extended reinforcement bars 4 are provided at the upper-stage wet joint 14 of the T-beam body 1 and at the width-direction end face of the prefabricated wet joint 2.

[0041] Specifically, the extended reinforcement bars 4 are provided at the upper-stage wet joint 14 of the T-beam and at the width-direction end face of the prefabricated wet joint 2, forming a connecting system with an annular staggered arrangement.

[0042] It should be noted that the extended reinforcement bars 4 at the upper-stage wet joint 14 of the T-beam body 1 and the extended reinforcement bars 4 of the prefabricated wet joint 2 are staggered, forming a spatial network structure. After pouring concrete, an integral stress system is formed, significantly improving the transverse load transfer efficiency. In addition, the staggered arrangement of the reinforcement bars can effectively inhibit the shrinkage cracks of the concrete. Compared with the traditional single-layer steel mesh, the crack resistance performance is improved by more than 40%.

[0043] It should also be noted that the extended reinforcement bars 4 adopt an annular structure. During installation, they are naturally staggered and nested, eliminating the on-site welding operation and reducing the welding workload.

[0044] In one embodiment, both the first notch and the beam rib 23 have prestressed ducts 32. The prestressed steel strands 31 are inserted into the prestressed ducts 32 to apply prestress, so that the two T-beam bodies 1 and the prefabricated wet joint 2 form a prestressed system.

[0045] Specifically, the prestressed ducts 32 are correspondingly provided at the first notch of the T-beam body 1 and the beam rib 23 of the prefabricated wet joint 2. By inserting and tensioning the prestressed steel strands 31, a cooperative stress mechanism of T-beam body 1 - wet joint - T-beam body 1 is realized.

[0046] In terms of construction technology, this design adopts a formwork-free assembly technology, cancels the traditional support system, simplifies the complex welding and cast-in-place processes into a strand-pulling and tensioning operation, significantly shortens the single-node construction time from 2 days to 4 hours, significantly improves the construction efficiency, and the prestress effectively controls the crack development during the operation period, realizing the control of crack width.

[0047] In addition, after the double beam ribs 23 are embedded in the notch, the reserved prestressed duct 32 thereof is naturally aligned with the prestressed duct 32 of the T-beam main body 1, ensuring the smooth threading and tensioning of the transverse steel tendons and reducing construction adjustment.

[0048] Embodiment: An assembled wet joint structure for transverse connection of multiple T-beams designs the traditional rectangular cross-section of the wet joint as a stepped cross-section. When the T-beam main body 1 is precast, at certain intervals along the beam length direction, first notches are provided on the flange plates 11 corresponding to the lower stepped wet joints 15 of the T-beam main body 1, and prestressed ducts 32 are reserved on the wing plates of the T-beam main body 1 at the corresponding positions of the first notches. The precast assembled wet joint 2 adopts a beam-slab structure, and the position of the cross beam (beam rib 23) corresponds to the position of the first notch on the flange plate 11 of the lower stepped wet joint 15 of the T-beam main body 1, and prestressed ducts 32 are reserved at the positions of the prestressed ducts 32 reserved on the wing plates of the corresponding precast T-beam main body 1.

[0049] In the transverse direction of the assembled wet joint 2, the width is the distance between the first notches of the flange plates 11 of the lower stepped wet joints 15 of the left and right T-beam main bodies 1. The longitudinal length of the assembled wet joint 2 can be 5 to 6 meters in combination with the span of the T-beam main body 1, and I-beams (protrusions 21) and corresponding second notches 22 are respectively preset at both ends of the assembled wet joint 2 in the longitudinal direction to ensure effective longitudinal connection. After the precast T-beam main body 1 is hoisted in place, the precast assembled wet joint 2 is hoisted. The beam ribs 23 of the assembled wet joint 2 are placed in the first notches of the flange plates 11 corresponding to the lower stepped wet joints 15 of the T-beam main body 1, the plate of the assembled wet joint 2 overlaps on the flange plate 11 of the lower stepped wet joint 15 of the T-beam main body 1, and the assembled wet joints 2 are longitudinally connected in pairs by I-beam notches. The left and right T-beam main bodies 1 and the structure of the assembled wet joint 2 are connected together through the transverse prestressed steel tendons 31 to complete the connection of the lower stepped wet joint 15; finally, the precast T-beam main body 1 and the precast assembled wet joint 2 are connected together through the cast-in-place joint section to complete the connection of the upper stepped wet joint 14; thus, the effective connection of all the transverse wet joints of the T-beam main body 1 is completed.

[0050] In the second aspect, the present application provides a construction method for an assembled wet joint structure for transverse connection of multiple T-beams, and the construction method includes: Step 1, in the precast stage of the T-beam main body 1, the T-beam main body 1 is precast into a stepped cross-section to form an upper stepped wet joint 14 and a lower stepped wet joint 15, and staggered first notches are arranged at intervals on the flange plates 11 corresponding to the lower stepped wet joint 15 along the beam length direction, and transverse prestressed ducts 32 are embedded in the first notches; Step 2, at the upper stepped wet joint 14 of the stepped cross-section, external extended ring-shaped steel bars are provided; Step 3: For the precast beam-slab composite structure's assembled wet joint 2, arrange multiple beam ribs 23 with prestressed ducts 32 in the width direction, and construct bumps 21 and second notches 22 at both ends. When adjacent assembled wet joints 2 are spliced, the bumps 21 and the second notches 22 form a mortise-and-tenon joint; Step 4: After hoisting the precast T-beam main body 1 into place, hoist the assembled wet joint 2 between adjacent T-beam main bodies 1; Step 5: Horizontally for the assembled wet joint 2, use the two ends of the beam rib 23 to respectively overlap and connect in the first notches of the two T-beam main bodies 1, ensuring that the prestressed ducts 32 of the beam rib 23 are aligned with the prestressed ducts 32 of the T-beam main body 1; Step 6: Vertically for the assembled wet joint 2, use the bump 21 or the second notch 22 to form a mortise-and-tenon joint with the adjacent assembled wet joint 2; Step 7: After the horizontal prestressed steel strands 31 of the T-beam main body 1 and the assembled wet joint 2 pass through the prestressed ducts 32, are tensioned, and the prestress system is anchored, pour grout into the upper-stage wet joint 14 and the joints of adjacent assembled wet joints 2.

[0051] It should be noted that the structure of the specific construction method of an assembled wet joint structure for transverse connection of multiple T-beams can refer to the description of an assembled wet joint structure for transverse connection of multiple T-beams, which will not be elaborated here.

[0052] Example: The specific construction method of an assembled wet joint structure for transverse connection of multiple T-beams is as follows:

[0053] (1) Fabricate the precast T-beam main body 1, design the traditional wet joint rectangular section as a stepped section (such as Figure 1 ). When prefabricating the T-beam main body 1, at certain intervals along the beam length direction, set first notches on the flange plates 11 corresponding to the lower-stage wet joints 15 of the T-beam main body 1, and reserve prestressed ducts 32 on the wing plates of the T-beam main body 1 at the corresponding positions of the first notches (such as Figure 2 ). At the intersection of the wing plates of the T-beam main body 1 on the symmetric sides of the center line of the beam rib 23 of the first notch, set tensioning and anchoring end notches. To avoid conflicts between the horizontal prestresses of the left and right wet joints of the T-beam main body 1 when passing through the beam rib 23 of the T-beam main body 1, when the above first notches are set on the left and right sides of the same T-beam main body 1, they are staggered along the beam length direction (such as Figure 2 ). To ensure the effective connection between the precast T-beam main body 1 and the precast assembled wet joint 2, when prefabricating the T-beam main body 1, extend the outer ring steel bars are reserved at the upper-stage wet joint 14 of the T-beam main body 1 (such as Figure 1 ).

[0054] (2) Fabricate a precast assembled wet joint structure. The precast assembled wet joint 2 adopts a beam-slab structure. The height of the beam rib 23 is not less than 25 cm (including the thickness of the beam slab), the thickness of the beam slab is not less than 15 cm, and the spacing of the beam ribs 23 in the longitudinal bridge direction is not greater than 2 meters (such as Figure 3 ). The transverse width of the beam-slab structure of the precast assembled wet joint 2 is the distance between the first notches of the upper flange plates 11 of the lower wet joints 15 of the left and right T-beam bodies 1; the longitudinal length of the precast assembled wet joint 2 is 5 to 6 meters in combination with the span of the T-beam body 1, and I-beams and corresponding second notches 22 are respectively preset at both longitudinal ends of the assembled wet joint 2 to ensure effective longitudinal connection (such as Figure 5 ). To ensure the effective connection between the precast assembled wet joint 2 and the precast T-beam body 1, when fabricating the beam-slab structure of the assembled wet joint 2, extendable ring-shaped steel bars are reserved on the beam slab, and prestressed duct holes 32 are reserved in the beam ribs 23 (such as Figure 4 ).

[0055] (3) After the T-beam body 1 is hoisted in place, hoist the precast assembled wet joint 2. Place the beam rib 23 of the wet joint into the first notch of the corresponding flange plate 11 of the lower wet joint 15 of the T-beam body 1. The slab of the assembled wet joint 2 overlaps on the corresponding flange plate 11 of the lower wet joint 15 of the T-beam body 1. The longitudinal wet joints 2 are connected to each other by I-beam notches in pairs (such as Figure 6 , Figure 7 and Figure 8 ).

[0056] (4) Thread the transverse prestressed steel tendons 31 and perform tensioning to connect the left and right T-beam bodies 1 and the structure of the precast assembled wet joint 2 together to complete the connection of the lower wet joint 15 (such as Figure 9 and Figure 10 ).

[0057] (5) Pour the cast-in-place connection section to connect the precast T-beam body 1 and the precast assembled wet joint 2, and pour high-strength self-compacting concrete into the longitudinal connection notch gap of the assembled wet joint 2 to complete the connection of the upper wet joint 14; thus completing the effective connection of all the transverse wet joints of the T-beam (such as Figure 11 and Figure 12 ).

[0058] Each embodiment in the present disclosure is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. The key points of each embodiment are the differences from other embodiments.

[0059] The protection scope of the present disclosure is not limited to the above embodiments. Obviously, those skilled in the art can make various modifications and deformations to the present disclosure without departing from the scope and spirit of the present disclosure. If these modifications and deformations fall within the scope of the claims of the present disclosure and their equivalent technologies, the intention of the present disclosure also includes these modifications and deformations.

Claims

1. An assembled wet joint structure for transverse connection of multiple T-beams, characterized in that The structure includes: A T-beam main body, with a lower-stage wet joint of the T-beam main body, and a plurality of first notches are arranged at intervals on the corresponding flange plate. A prefabricated wet joint, with a plurality of beam ribs arranged along its width direction at intervals below the length direction, and convex blocks and second notches are correspondingly arranged at both end faces of the prefabricated wet joint; wherein, the two T-beam main bodies are arranged at intervals, the prefabricated wet joint is arranged between the two T-beam main bodies, and both ends of the beam rib are respectively correspondingly lapped in the first notches of the two T-beam main bodies; the prefabricated wet joint and the T-beam main body are connected by prestress and grouted with slurry; two adjacent prefabricated wet joints are lapped by the convex blocks and the second notches to form a mortise and tenon type fit.

2. The precast wet joint structure for transverse connection of multiple T-beams according to claim 1, characterized in that The first notch at least includes a first-size first notch and a second-size first notch, wherein the first-size first notch is larger than the second-size first notch.

3. The precast wet joint structure for transverse connection of multiple T-shaped beams according to claim 2, characterized in that, The size of the first-size first notch is twice that of the second-size first notch; a plurality of the second-size first notches are located between the two first-size first notches.

4. The prefabricated wet joint structure for transverse connection of multiple T-beams according to claim 3, characterized in that, The first notches on the left and right sides of the T-beam main body are staggered.

5. The prefabricated wet joint structure for transverse connection of multiple T-shaped beams according to claim 3, characterized in that, At both ends in the length direction of the prefabricated wet joint, there are beam ribs arranged along its width direction, so that the beam ribs and the prefabricated wet joint form a right angle.

6. The precast wet joint structure for transverse connection of multiple T-shaped beams according to claim 5, wherein When two adjacent prefabricated wet joints are spliced, the beam ribs of the two adjacent prefabricated wet joints are placed in the first-size first notches.

7. The precast wet joint structure for transverse connection of multiple T-beams according to claim 1, characterized in that, The number of the convex blocks is arranged at intervals in plurality, the number of the second notches is the same as that of the convex blocks, and the positions are corresponding; the convex blocks are located at the upper part of the end face of the prefabricated wet joint; the second groove is located at the upper part of the end face of the prefabricated wet joint, and the second groove is a right-angle groove.

8. The precast wet joint structure for transverse connection of multiple T-beams according to claim 1, characterized in that, At the upper-stage wet joint of the T-beam main body and at the width-direction end face of the prefabricated wet joint, external extended steel bars are arranged.

9. The precast wet joint structure for transverse connection of multiple T-shaped beams according to any one of claims 1-8, characterized in that, Both the first notch and the beam rib are provided with prestressed duct, and prestressed steel strands are inserted into the prestressed duct to apply prestress, so that the two T-beam main bodies and the prefabricated wet joint form a precompression stress system.

10. A construction method for an assembled wet joint structure for transverse connection of multiple T-beams, characterized in that, The construction method includes: In the prefabrication stage of the T-beam main body, the T-beam main body is prefabricated into a stepped section, forming an upper-stage wet joint and a lower-stage wet joint, and along the beam length direction, staggered first notches are arranged at intervals on the flange plate corresponding to the lower-stage wet joint, and transverse prestressed ducts are embedded in the first notches. At the upper-stage wet joint of the stepped section, external extended circular steel bars are arranged. Prefabricate a prefabricated wet joint of a precast beam and slab composite structure, arrange a plurality of beam ribs with prestressed ducts in the width direction, and construct convex blocks and second notches at both ends. When adjacent prefabricated wet joints are spliced, the convex blocks and the second notches form a mortise and tenon type fit. After hoisting the prefabricated T-beam main body into place, then hoist the prefabricated wet joint between adjacent T-beam main bodies. Transversely of the prefabricated wet joint, the two ends of the beam rib are respectively correspondingly lapped in the first notches of the two T-beam main bodies to ensure that the prestressed ducts of the beam rib are aligned with the prestressed ducts of the T-beam main body. Longitudinally, the precast wet joint uses the convex block or the second notch to be mortise and tenon fitted with the adjacent precast wet joint; After the transverse prestressed steel tendons of the T-beam main body and the precast wet joint pass through the prestressed duct, are tensioned, and the prestressing system is anchored, grout is poured into the upper-stage wet joint and the joint between the adjacent precast wet joints.

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