An assembled wet joint structure and construction method for transversely connecting multiple T-beams

Abstract

The present application belongs to the technical field of prefabricated bridge foundations. An assembled wet joint structure with multiple T-beams connected transversely includes a T-beam main body, a lower-step wet joint of the T-beam main body, and a plurality of first notches are arranged at intervals on the corresponding flange plates; the assembled wet joint has a plurality of beam ribs arranged along its width direction at intervals below the length direction, and protrusions and second notches are correspondingly provided on the end faces of both ends of the assembled wet joint; wherein, two T-beam main bodies are arranged at intervals, the assembled wet joint is arranged between the two T-beam main bodies, and the two ends of the beam ribs are respectively overlapped in the first notches of the two T-beam main bodies; the assembled wet joint is connected to the T-beam main body through prestressing and grouting; two adjacent assembled wet joints are overlapped with the second notch through the protrusion to form a mortise and tenon joint. It can achieve high-precision and rapid assembly of prefabricated components and solve the construction problems existing in traditional cast-in-place wet joints.

Description

Technical Field

[0001] The present application belongs to the technical field of prefabricated bridge foundations, and in particular relates to an assembled wet joint structure and a construction method for transversely connecting multiple T-beams. Background Art

[0002] Prefabricated reinforced concrete structures, a revolutionary technology in modern bridge construction, have become a mainstream trend in the industry due to their significant engineering advantages. This construction model, through the organic combination of factory prefabrication and on-site modular assembly, achieves synergistic improvements in construction efficiency, project quality, and environmental benefits. Regarding construction efficiency, prefabricated components are mass-produced on standardized production lines, enabling parallel construction with bridge foundation construction and on-site hoisting operations, shortening the construction period by approximately 40% compared to traditional cast-in-place construction. Regarding quality control, the factory's constant temperature and humidity curing environment and automated production equipment reduce concrete strength dispersion to within 5% and maintain rebar positioning accuracy within ±2mm, effectively mitigating quality fluctuations caused by human factors during on-site construction. Regarding sustainability, prefabrication can reduce on-site construction waste by over 80% and reduce construction noise and dust pollution by 60%, aligning with the development of green construction. As the core force-transmitting structure of the system, wet joints fulfill key functions such as distributing lateral loads on the bridge deck and strengthening structural integrity. The flange plates of adjacent T-beams are connected as a whole through rigid connections. It not only needs to transfer the lateral bending moment and shear force generated by vehicle loads, but also coordinate the collaborative deformation of multiple main beams, which has a decisive impact on the durability and load-bearing safety of the bridge structure.

[0003] However, traditional cast-in-place wet joint construction still has significant technical bottlenecks: First, the reinforcement project needs to complete the positioning and binding of dense steel bars in a small space. The wet joints of a single-span bridge often involve more than 2,000 welding nodes, which makes the construction efficiency low and prone to quality defects such as cold welding and leaking welding; second, the formwork support requires the establishment of a suspension bracket system. After the formwork is removed, surface defects such as honeycomb surface often appear, and the rework rate is as high as . What is more prominent is that in coastal high salt fog environments or northern freeze-thaw cycle areas, these construction defects will accelerate structural deterioration, causing the joint area to become a weak link in the entire life cycle of the bridge. Therefore, how to break through the technical bottleneck of wet joint construction and achieve balanced optimization of industrialized construction and structural performance has become a topic that promotes the iterative upgrading of prefabricated bridge technology. Summary of the Invention

[0004] Based on this, it is necessary to provide a prefabricated wet joint structure and construction method for transversely connecting multiple T-beams to address the above technical problems.

[0005] In a first aspect, the present application provides a prefabricated wet joint structure in which multiple T-beams are transversely connected, comprising:

[0006] A T-beam body, wherein a plurality of first notches are provided at intervals on the flange plates corresponding to the lower step wet joints of the T-beam body;

[0007] The assembled wet joint has a plurality of beam ribs arranged along its width direction at intervals below in the length direction, and protrusions and second slots are provided on the end surfaces of both ends of the assembled wet joint; wherein, the two T-beam bodies are arranged at intervals, the assembled wet joint is arranged between the two T-beam bodies, and the two ends of the beam ribs are overlapped in the first slots of the two T-beam bodies respectively; the assembled wet joint is connected to the T-beam body by prestressing and grouting; two adjacent assembled wet joints are overlapped with the second slots through the protrusions to form a mortise and tenon joint.

[0008] In some implementations, the first notch includes at least a first notch of a first size and a first notch of a second size, wherein the first notch of the first size is larger than the first notch of the second size.

[0009] In some implementations, the size of the first notch of the first size is twice that of the first notch of the second size; and a plurality of first notches of the second size are located between two first notches of the first size.

[0010] In some implementations, the first notches on the left and right sides of the T-beam body are staggered.

[0011] In some practicable embodiments, both ends of the assembled wet joint in the length direction have beam ribs arranged along the width direction thereof, so that the beam ribs and the assembled wet joint form a right angle.

[0012] In some practicable embodiments, when two adjacent prefabricated wet joints are spliced, the beam ribs of the two adjacent prefabricated wet joints are placed in the first notch of the first size.

[0013] In some embodiments, the number of the protrusions is arranged in a plurality of intervals, the number of the second notches is the same as the number of the protrusions, and the positions are corresponding; the protrusions are located on the upper end surface of the assembled wet joint; the second notch is located on the upper end surface of the assembled wet joint, and the second notch is a right-angle groove.

[0014] In some practicable embodiments, overhanging steel bars are provided at the upper wet joint of the T-beam body and at the width end faces of the assembled wet joint.

[0015] In some practicable methods, the first notch and the beam rib are provided with prestressed channels, and prestressed steel strands are inserted into the prestressed channels to apply prestress, so that the two T-beam bodies and the assembled wet joints form a prestressed stress system.

[0016] In a second aspect, the present application provides a method for constructing a prefabricated wet-jointed structure in which multiple T-beams are transversely connected. The method comprises:

[0017] During the prefabrication stage of the T-beam body, the T-beam body is prefabricated into a stepped section to form an upper step wet joint and a lower step wet joint, and first notches are arranged at intervals along the length of the beam on the flange plates corresponding to the lower step wet joints, with transverse prestressed channels embedded in the first notches;

[0018] An outwardly extending annular steel bar is provided at the upper step wet joint of the stepped section;

[0019] The assembled wet joint of the prefabricated beam-slab composite structure has a plurality of beam ribs with prestressed channels arranged in the width direction, and a protrusion and a second notch constructed at both ends. When adjacent assembled wet joints are spliced, the protrusion and the second notch form a mortise and tenon joint.

[0020] After the prefabricated T-beam bodies are hoisted into place, the assembled wet joints are hoisted between adjacent T-beam bodies;

[0021] In the transverse direction of the assembled wet joint, the two ends of the beam rib are overlapped in the first notches of the two T-beam bodies respectively, ensuring that the prestressed channel of the beam rib is aligned with the prestressed channel of the T-beam body;

[0022] In the longitudinal direction of the assembled wet joint, the protrusion or the second notch is used to engage with the adjacent assembled wet joint mortise and tenon joint;

[0023] After the transverse prestressed steel strands of the T-beam body and the prefabricated wet joint are passed through the prestressed duct and tensioning is completed, and the prestressed system is anchored, grout is poured into the upper-step wet joint and the joints of the adjacent prefabricated wet joints.

[0024] Beneficial effects: A prefabricated wet joint structure with multiple T-beams connected transversely comprises: a T-beam main body, a plurality of first notches are arranged at intervals on the corresponding flange plates of the lower wet joint of the T-beam main body; a plurality of beam ribs arranged along the width direction are arranged at intervals below the prefabricated wet joint in the length direction, and protrusions and second notches are correspondingly provided on the end faces of both ends of the prefabricated wet joint; wherein, two of the T-beam main bodies are arranged at intervals, the prefabricated wet joint is arranged between the two T-beam main bodies, and the two ends of the beam ribs are respectively overlapped in the first notches of the two T-beam main bodies; the prefabricated wet joint is connected to the T-beam main body by prestressing and grouting; two adjacent prefabricated wet joints are overlapped by the protrusions and the second notches to form a mortise and tenon joint. The above structure can achieve high-precision and rapid assembly of prefabricated components, solving the construction problems existing in traditional cast-in-place wet joints. The prefabricated wet joint achieves adjustment-free installation of modular components through precise alignment of the first notch preset on the T-beam body and the prefabricated wet joint beam rib, shortening the wet joint construction time of single-span bridges. The mechanical interlocking structure of the beam rib and the first notch forms a stable force transmission path. The protrusions set at both ends of the prefabricated wet joint form a mortise and tenon connection with the second notch, realizing automatic alignment of adjacent wet joints. The high-strength slurry poured on site forms a whole in the gaps between prefabricated components, which not only ensures the continuity of the structure but also avoids construction delays caused by cast-in-place concrete curing. Through the organic combination of factory prefabrication and on-site assembly, this system reduces the impact of environmental factors on the quality of wet joint construction, providing reliable technical support for the promotion and application of prefabricated bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic cross-sectional view of a T-beam main body of an assembled wet-jointed structure in which multiple T-beams are transversely connected in one embodiment;

[0027] Figure 2 A three-dimensional schematic diagram of a T-beam main body of an assembled wet-jointed structure in which multiple T-beams are connected transversely in one embodiment;

[0028] Figure 3 A schematic diagram of an assembled wet joint structure of an assembled wet joint structure in which multiple T-beams are connected transversely in one embodiment;

[0029] Figure 4A schematic perspective view of an assembled wet joint structure of an assembled wet joint structure in which multiple T-beams are connected transversely in one embodiment;

[0030] Figure 5 A schematic diagram of longitudinal connection of adjacent assembled wet joints in an assembled wet joint structure in which multiple T-beams are connected transversely in one embodiment;

[0031] Figure 6 A schematic side view of a T-beam main body and assembled wet joints of an assembled wet joint structure in which multiple T-beams are connected transversely in one embodiment;

[0032] Figure 7 A schematic three-dimensional diagram of the assembly of a T-beam main body and an assembled wet joint of an assembled wet joint structure in which multiple T-beams are connected transversely in one embodiment;

[0033] Figure 8 A schematic diagram of a longitudinal connection of an assembled wet-joint structure in which multiple T-beams are connected transversely in accordance with an embodiment;

[0034] Figure 9 A schematic diagram of an assembled wet joint structure of a transversely connected assembled T-beam structure with multiple T-beams in one embodiment after being connected with a prefabricated T-beam body in a transversely prestressed manner;

[0035] Figure 10 It is a three-dimensional schematic diagram of an assembled wet joint structure of a plurality of T-beams connected transversely in one embodiment, after being connected with a prefabricated T-beam body in a transverse prestressed manner;

[0036] Figure 11 This is a schematic diagram of a prefabricated wet joint structure of a prefabricated wet joint structure with multiple T-beams connected transversely in one embodiment after the cast-in-place joint section between the prefabricated wet joint structure and the prefabricated T-beam body is completed;

[0037] Figure 12 This is a three-dimensional schematic diagram of an assembled wet joint structure of a plurality of T-beams connected transversely in one embodiment after the cast-in-place joint section of the assembled wet joint structure and the prefabricated T-beam main body is cast.

[0038] Reference numerals:

[0039] 1. T-beam body; 11. Flange plate; 12. First notch of first size; 13. First notch of second size; 14. Upper step wet joint; 15. Lower step wet joint;

[0040] 2. Fabricated wet joint; 21. Bump; 22. Second notch; 23. Beam rib;

[0041] 31. Prestressed steel tendons; 32. Prestressed ducts;

[0042] 4. Extended steel bars. DETAILED DESCRIPTION

[0043] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein 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" as used herein includes any and all couplings of one or more of the associated listed items.

[0045] It will be understood that the terms "first," "second," etc. used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element.

[0046] The following are some explanations of some terms involved in this application to facilitate understanding of this application:

[0047] A T-beam is a reinforced concrete or prestressed concrete beam with a T-shaped cross-section. It is one of the most commonly used load-bearing components in bridge engineering.

[0048] The traditional wet joint structure of a T-beam is a cast-in-place reinforced concrete structure with a rectangular cross-section. After the T-beam is installed, the wet joint concrete is poured by setting a wet joint hanging form. The present application provides a prefabricated wet joint structure for connecting multiple T-beams horizontally. The wet joint cross-section is a stepped cross-section. The transverse wet joints of the T-beams are connected by prefabricated prefabricated wet joints, transverse prestressed steel strands, and wet joint cast-in-place joint sections.

[0049] like Figures 1 to 12 As shown, in a first aspect, the present application provides a prefabricated wet joint structure in which multiple T-beams are transversely connected, comprising a T-beam body 1 and a prefabricated wet joint 2.

[0050] Among them, the T-beam body 1, the lower step wet joint 15 of the T-beam body 1, and the corresponding flange plate 11 are provided with multiple first notches at intervals, and the distances between the multiple first notches can be equal.

[0051] Specifically, the first notch includes at least a first notch of a first size 12 and a first notch of a second size 13, wherein the first notch of the first size 12 is larger than the first notch of the second size 13. Furthermore, the size of the first notch of the first size 12 is twice that of the first notch of the second size 13; and a plurality of first notches of the second size 13 are located between two first notches of the first size 12.

[0052] The above structure makes the distance between the groove walls of the first-size first notch 12 twice the distance between the groove walls of the second-size first notch 13 , so that the first-size first notch 12 has more space to accommodate the two protrusions 21 of the assembled wet joint 2 .

[0053] The T-beam body 1 designs the traditional wet joint rectangular section into a stepped section, forming an upper-step wet joint 14 and a lower-step wet joint 15, wherein the lower-step wet joint 15 corresponds to a first notch provided on the flange plate 11, and this notch is used to cooperate with the assembled wet joint 2 to form a fixed structure; and the upper-step wet joint 14 has an extended steel bar 4 in the width direction of the bridge, preferably, the extended steel bar 4 is a ring steel bar, which plays a reinforcing role.

[0054] In addition, the first notches on the left and right sides of the T-beam body 1 are staggered to solve the spatial conflict problem of the transverse prestressed steel strands 31 and optimize the structural stress performance.

[0055] Specifically, the transverse prestressed steel strands 31 need to pass through the reserved channel (corresponding to the first notch position) of the flange plate 11 of the T-beam body 1. If the first notches on the left and right sides are aligned, the prestressed steel strands 31 will cross in space when passing through the beam ribs 23 of the T-beam body 1 (e.g. Figure 2 The left and right first notches are staggered along the length of the beam, so that the paths of the prestressed steel strands 31 on both sides are staggered within the beam rib 23 to avoid cross interference.

[0056] Furthermore, the staggered arrangement of the first notches staggers the anchorage ends of the left and right prestressed steel strands 31 (located at the intersection of the flange and rib 23 of the T-beam body 1), providing ample operating space for the tensioning equipment and preventing tool collisions. The staggered arrangement of the prestressed steel strands 31 ensures more uniform coverage of the beam's transverse cross-section, reducing localized stress concentrations. The staggered first notches and prestressed steel strands 31 form a spatial network of force-bearing structures, enhancing the integrity and torsional rigidity of the T-beam body 1's transverse connections.

[0057] The assembled wet joint 2 has a plurality of beam ribs 23 arranged along its width direction at intervals below in the length direction. Both end surfaces of the assembled wet joint 2 are provided with protrusions 21 and second notches 22 correspondingly.

[0058] Specifically, the two T-beam bodies 1 are arranged at intervals, the assembled wet joint 2 is arranged between the two T-beam bodies 1, and the two ends of the beam rib 23 are respectively overlapped in the first notches of the two T-beam bodies 1; the assembled wet joint 2 and the T-beam body 1 are connected by prestressing and grouting; two adjacent assembled wet joints 2 are overlapped with the second notches 22 through the protrusion 21 to form a mortise and tenon joint.

[0059] It should be noted that both ends of the assembled wet joint 2 in the longitudinal 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 together 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 together. After fitting together, the two beam ribs 23 can just fit into 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 second notch 13. 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.

[0060] This design achieves precise and efficient splicing and connection of adjacent wet joints by placing beam ribs 23 at both ends of the prefabricated wet joint 2, along with slots of the first dimension (width of the double beam ribs 23) and the second dimension (width of the single beam rib 23). The beam ribs 23 at the ends of adjacent wet joints are arranged at right angles, allowing for a natural fit during splicing, ensuring longitudinal alignment and eliminating manual adjustments, thereby improving construction efficiency. Because the slots of the first dimension can only accommodate double beam ribs 23, a single wet joint cannot be inserted if it is incorrectly installed (such as rotated or offset), preventing construction errors and creating a fault-proofing mechanism. Furthermore, the two beam ribs 23 are inserted side by side into the slots of the first dimension, forming a monolithic ribbed plate structure. This significantly improves longitudinal bending and shear resistance and avoids stress concentration associated with a single beam rib 23. After splicing, the wet joint ends are perfectly aligned, allowing loads to be continuously transferred through the beam ribs 23 and the cast-in-place concrete, enhancing structural integrity.

[0061] 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 correspond to each other; the protrusions 21 are located on the upper end surface of the assembled wet joint 2; the second notch 22 is located on the upper end surface of the assembled wet joint 2, and the second notch 22 is a right-angle groove.

[0062] The design sets a plurality of spaced-apart protrusions 21 on the upper end surface of the assembled wet joint 2, and correspondingly sets a right-angled 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, reducing manual adjustments and increasing 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 multiple spaced-apart protrusions 21 form a multi-point fit with the notch, so that the longitudinal load is evenly transferred and stress concentration is avoided. The second notch 22 is a right-angled groove (not a bevel or arc), which fits tightly with the right-angled surface of the protrusion 21, significantly improving the shear resistance of the joint.

[0063] Furthermore, the protrusion 21 and the second notch 22 are located at the upper end of the wet joint, forming a sealed space after splicing, preventing leakage of cast-in-place concrete and ensuring the quality of the joint. The tight fit between the protrusion 21 and the notch can partially replace the function of the formwork, reducing the difficulty of sealing during cast-in-place construction.

[0064] The uniform spacing between the protrusions 21 and the second notches 22 facilitates standardized factory prefabrication and reduces mold complexity. Adjusting the number and spacing of the protrusions 21 allows for flexible adaptation to T-beams of varying spans, enhancing design versatility. For example, the protrusions 21 can be I-beams.

[0065] In one embodiment, the upper step wet joint 14 of the T-beam body 1 and the width direction end face of the assembled wet joint 2 are both provided with protruding steel bars 4 .

[0066] Specifically, the extended steel bars 4 are provided at the upper step wet joints 14 of the T-beam and at the width end faces of the assembled wet joints 2 to form a connection system with a ring-shaped staggered arrangement.

[0067] It should be noted that the extended rebar (4) at the upper wet joint (14) of the T-beam body (1) is staggered with the extended rebar (4) at the prefabricated wet joint (2), forming a spatial mesh structure. After concrete pouring, this creates a monolithic load-bearing system, significantly improving the efficiency of lateral load transfer. Furthermore, the staggered arrangement of rebar effectively suppresses concrete shrinkage cracks, improving crack resistance by over 40% compared to traditional single-layer steel mesh.

[0068] It should also be noted that the protruding steel bars 4 adopt a ring structure, which is naturally staggered and nested during installation, eliminating on-site welding operations and reducing the amount of welding work.

[0069] In one embodiment, the first notch and the beam rib 23 are both provided with a prestressed channel 32 , and a prestressed steel strand 31 is inserted into the prestressed channel 32 to apply prestress, so that the two T-beam bodies 1 and the assembled wet joint 2 form a pre-compressive stress system.

[0070] Specifically, prestressed channels 32 are correspondingly arranged on the first notch of the T-beam body 1 and the beam rib 23 of the assembled wet joint 2. By inserting and tensioning the prestressed steel bundle 31, a coordinated force mechanism of the T-beam body 1-wet joint-T-beam body 1 is formed.

[0071] In terms of construction technology, the design adopts formwork-free assembly technology, eliminates the traditional support system, and simplifies the complex welding and cast-in-place process into bundle threading and tensioning operations, which greatly shortens the construction time of a single node from 2 days to 4 hours, significantly improving construction efficiency. The prestressing stress effectively controls the development of cracks during the operation period and achieves control of crack width.

[0072] In addition, after the double beam rib 23 is embedded in the notch, its reserved prestressed channel 32 is naturally aligned with the prestressed channel 32 of the T beam body 1, ensuring smooth threading and tensioning of the transverse steel strands and reducing construction adjustments. Example

[0073] This prefabricated wet-joint structure, connecting multiple T-beams horizontally, replaces the traditional rectangular wet-joint cross-section with a stepped cross-section. During prefabrication of the T-beam body 1, first notches are provided at regular intervals along the length of the beam, corresponding to the lower-step wet-joint 15 of the T-beam body 1. Prestressed channels 32 are also reserved on the flange of the T-beam body 1 at the positions corresponding to the first notches. The prefabricated prefabricated wet-joint 2 utilizes a beam-slab structure, with the crossbeam (beam rib 23) aligned with the first notches on the flange 11 corresponding to the lower-step wet-joint 15 of the T-beam body 1. Prestressed channels 32 are also reserved in the crossbeam at the locations corresponding to the prestressed channels 32 reserved on the flange of the prefabricated T-beam body 1.

[0074] The transverse width of the prefabricated wet joint 2 is the distance between the first notches of the flange plates 11 of the lower wet joint 15 of the left and right T-beam bodies 1. The longitudinal length, combined with the span of the T-beam body 1, can be 5 to 6 meters. I-beams (bumps 21) and corresponding second notches 22 are pre-set at both ends of the prefabricated wet joint 2 in the longitudinal direction to ensure an effective connection in the longitudinal direction. After the prefabricated T-beam body 1 is hoisted into place, the prefabricated prefabricated wet joint 2 is hoisted in place. The beam ribs 23 of the prefabricated wet joint 2 are placed in the first notches of the corresponding flange plates 11 of the lower wet joint 15 of the T-beam body 1. The prefabricated wet joint 2 is overlapped on the flange plates 11 of the lower wet joint 15 of the T-beam body 1. The prefabricated wet joints 2 are connected longitudinally in pairs using I-beam notches. The left and right T-beam bodies 1 and the assembled wet joints 2 are structurally connected together through the transverse prestressed steel tendons 31 to complete the connection of the lower-step wet joints 15; finally, the prefabricated T-beam body 1 and the prefabricated assembled wet joints 2 are connected together through the cast-in-place joint section to complete the connection of the upper-step wet joints 14; thereby completing the effective connection of all transverse wet joints of the T-beam body 1.

[0075] In a second aspect, the present application provides a method for constructing a prefabricated wet-jointed structure in which multiple T-beams are transversely connected. The method comprises:

[0076] Step 1: During the prefabrication stage of the T-beam body 1, the T-beam body 1 is prefabricated into a stepped section to form an upper wet joint 14 and a lower wet joint 15. First notches are staggered and arranged at intervals along the length of the beam on the flange plate 11 corresponding to the lower wet joint 15. Transverse prestressed channels 32 are embedded in the first notches.

[0077] Step 2: installing an outwardly extending annular steel bar at the upper wet joint 14 of the stepped section;

[0078] Step 3: Prefabricate the assembled wet joints 2 of the beam-slab composite structure, arrange multiple beam ribs 23 with prestressed channels 32 in the width direction, and construct protrusions 21 and second notches 22 at both ends. When adjacent assembled wet joints 2 are spliced, the protrusions 21 and the second notches 22 form a mortise and tenon fit;

[0079] Step 4: After the prefabricated T-beam body 1 is hoisted into place, the assembled wet joint 2 is hoisted between the adjacent T-beam bodies 1;

[0080] Step 5: In the transverse direction of the assembled wet joint 2, the two ends of the beam rib 23 are overlapped in the first notches of the two T-beam bodies 1 to ensure that the prestressed channel 32 of the beam rib 23 is aligned with the prestressed channel 32 of the T-beam body 1;

[0081] Step 6: The assembled wet joint 2 is engaged with the adjacent assembled wet joint 2 by using the protrusion 21 or the second notch 22 in the longitudinal direction;

[0082] Step seven: After the transverse prestressed steel strands 31 of the T-beam body 1 and the prefabricated wet joint 2 are passed through the prestressed duct 32 and tensioning is completed and the prestressed system is anchored, grout is poured into the upper-step wet joint 14 and the joints of the adjacent prefabricated wet joint 2.

[0083] It should be noted that the specific construction method of a prefabricated wet joint structure in which multiple T-beams are horizontally connected can refer to the description of a prefabricated wet joint structure in which multiple T-beams are horizontally connected, and will not be repeated here. Example

[0084] The specific construction method of a prefabricated wet joint structure with multiple T-beams connected horizontally is as follows:

[0085] (1) Make the assembled T-beam body 1 and design the traditional wet joint rectangular section into a stepped section (such as Figure 1), when the T-beam body 1 is prefabricated, a first notch is provided on the flange plate 11 corresponding to the lower wet joint 15 of the T-beam body 1 at a certain interval along the length of the beam, and a prestressed hole 32 is reserved on the flange plate of the T-beam body 1 at the position corresponding to the first notch (such as Figure 2 ), the flange of the T-beam body 1 on the symmetrical side of the first notch along the center line of the beam rib 23 of the T-beam body 1 is provided with a tension anchor end notch at the intersection with the beam rib 23. In order to avoid the transverse prestressing force of the left and right wet joints of the T-beam body 1 from conflicting when passing through the beam rib 23 of the T-beam body 1, the above-mentioned first notches are provided on the left and right sides of the same T-beam body 1, and are staggered along the length of the beam (such as Figure 2 To ensure the effective connection between the prefabricated T-beam body 1 and the prefabricated assembled wet joint 2, when the T-beam body 1 is prefabricated, an extended annular steel bar (such as Figure 1 ).

[0086] (2) Make a prefabricated assembled wet joint structure. The prefabricated 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 between the beam ribs 23 along the bridge is not more than 2 meters (such as Figure 3 The transverse width of the prefabricated assembled wet joint 2 beam-slab structure is the distance between the first notches of the upper flange plates 11 of the lower wet joint 15 of the left and right T-beam bodies 1; the length of the prefabricated assembled wet joint 2 in the longitudinal direction 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 preset at both ends of the assembled wet joint 2 in the longitudinal direction to ensure effective connection in the longitudinal direction (such as Figure 5 To ensure that the prefabricated wet joint 2 is effectively connected to the prefabricated T-beam body 1, when the beam-slab structure of the prefabricated wet joint 2 is prefabricated, an extended annular steel bar is reserved on the beam slab, and a prestressed channel 32 is reserved on the beam rib 23 (such as Figure 4 ).

[0087] (3) After the T-beam body 1 is hoisted into place, the prefabricated assembled wet joint 2 is hoisted, and the wet joint beam rib 23 is placed in the first notch of the flange plate 11 corresponding to the lower wet joint 15 of the T-beam body 1. The assembled wet joint 2 plate is overlapped on the flange plate 11 corresponding to the lower wet joint 15 of the T-beam body 1. The assembled wet joint 2 is connected longitudinally in pairs using the I-beam notch (such as Figure 6 、 Figure 7 and Figure 8 ).

[0088] (4) Insert the transverse prestressed steel strand 31 and tension it, connect the left and right T-beam main bodies 1 and the prefabricated assembled wet joint 2 structure together, and complete the connection of the lower-level wet joint 15 (such as Figure 9 and Figure 10 ).

[0089] (5) Cast the cast-in-place joint section to connect the prefabricated T-beam body 1 and the prefabricated assembled wet joint 2 together, 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-step wet joint 14; thereby completing the effective connection of all the transverse wet joints of the T-beam (such as Figure 11 and Figure 12 ).

[0090] The various embodiments in the present disclosure are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0091] The scope of protection of the present disclosure is not limited to the above-described embodiments. Obviously, those skilled in the art may make various modifications and variations to the present disclosure without departing from the scope and spirit of the present disclosure. If such modifications and variations fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such modifications and variations.

Claims

1. An assembled wet joint structure with multiple T-beams connected transversely, characterized in that: The structure includes: A T-beam body, wherein a plurality of first notches are provided at intervals on the flange plates corresponding to the lower step wet joints of the T-beam body; The assembled wet joint has a plurality of beam ribs arranged along its width direction at intervals below in the length direction, and protrusions and second slots are provided on the end surfaces of both ends of the assembled wet joint; wherein, the two T-beam bodies are arranged at intervals, the assembled wet joint is arranged between the two T-beam bodies, and the two ends of the beam ribs are overlapped in the first slots of the two T-beam bodies respectively; the assembled wet joint is connected to the T-beam body by prestressing and grouting; two adjacent assembled wet joints are overlapped with the second slots through the protrusions to form a mortise and tenon joint; wherein, the first slot at least includes a first slot of a first size and a second slot, wherein the first slot of the first size is larger than the first slot of the second size.

2. The assembled wet joint structure with multiple T-beams connected transversely according to claim 1, characterized in that: The size of the first notch of the first size is twice that of the first notch of the second size; and a plurality of first notches of the second size are located between two first notches of the first size.

3. The assembled wet joint structure with multiple T-beams connected transversely according to claim 2, characterized in that: The first notches on the left and right sides of the T-beam body are arranged alternately.

4. The assembled wet joint structure with multiple T-beams connected transversely according to claim 2, characterized in that: Both ends of the assembled wet joint in the length direction have beam ribs arranged along the width direction thereof, so that the beam ribs and the assembled wet joint form a right angle.

5. The assembled wet joint structure with multiple T-beams connected transversely according to claim 4, characterized in that: When two adjacent assembled wet joints are spliced, the beam ribs of the two adjacent assembled wet joints are placed in the first notch of the first size.

6. The assembled wet joint structure with multiple T-beams connected transversely according to claim 1, characterized in that: The number of the protrusions is multiple and spaced apart, the number of the second notches is the same as the number of the protrusions, and the positions are corresponding; the protrusions are located on the upper end surface of the assembled wet joint; the second notch is located on the upper end surface of the assembled wet joint, and the second notch is a right-angle groove.

7. The assembled wet joint structure with multiple T-beams connected transversely according to claim 1, characterized in that: Outrigger steel bars are provided at the upper step wet joint of the T-beam body and at the width direction end faces of the assembled wet joint.

8. The assembled wet joint structure of multiple T-beams connected transversely according to any one of claims 1 to 7, characterized in that: The first notch and the beam rib are both provided with prestressed channels, and prestressed steel strands are inserted into the prestressed channels to add prestress, so that the two T-beam bodies and the assembled wet joints form a pre-compression stress system.

9. A method for constructing a prefabricated wet joint structure with multiple T-beams connected transversely, characterized in that: The construction method comprises: During the prefabrication stage of the T-beam body, the T-beam body is prefabricated into a stepped section to form an upper step wet joint and a lower step wet joint, and first notches are arranged at intervals along the length of the beam on the flange plates corresponding to the lower step wet joints, with transverse prestressed channels embedded in the first notches; An outwardly extending annular steel bar is provided at the upper step wet joint of the stepped section; The assembled wet joint of the prefabricated beam-slab composite structure has a plurality of beam ribs with prestressed channels arranged in the width direction, and a protrusion and a second notch constructed at both ends. When adjacent assembled wet joints are spliced, the protrusion and the second notch form a mortise and tenon joint. After the prefabricated T-beam bodies are hoisted into place, the assembled wet joints are hoisted between adjacent T-beam bodies; In the transverse direction of the assembled wet joint, the two ends of the beam rib are overlapped in the first notches of the two T-beam bodies respectively, ensuring that the prestressed channel of the beam rib is aligned with the prestressed channel of the T-beam body; In the longitudinal direction of the assembled wet joint, the protrusion or the second notch is used to engage with the adjacent assembled wet joint mortise and tenon joint; After the transverse prestressed steel strands of the T-beam body and the assembled wet joint are passed through the prestressed duct and tensioning is completed, and the prestressed system is anchored, grout is poured into the upper-step wet joint and the joints of the adjacent assembled wet joints; wherein, The first notch includes at least a first notch of a first size and a first notch of a second size, wherein the first notch of the first size is larger than the first notch of the second size.

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