Form-removal-free wet joint structure suitable for precast beam
By using a combination structure of UHPC truss panels and tie rods between precast beams, the problem of cumbersome formwork removal steps in the construction of wet joints of precast beams was solved, enabling a fast and safe construction process and reducing traffic impact and costs.
Patent Information
- Application Number
- CN202423235190.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-25
AI Technical Summary
The existing construction of wet joints for precast beams requires a complicated formwork removal process, which affects traffic and is costly.
UHPC truss panels are used as a formwork-free structure. Taking advantage of their built-in truss reinforcement and lightweight, high-strength characteristics, combined with tie rods and steel pipes, a wet joint structure is formed between precast beams. The structure is fixed by a mountain-shaped locking buckle to prevent grout leakage and is installed on site after being prefabricated in the factory.
It reduces construction steps, increases construction speed, reduces the risk and cost of traffic congestion, and enhances the convenience and safety of construction.
Smart Images
Figure CN223675125U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the prefabricated municipal bridge structure, concretely relates to a kind of formwork dismantling-free wet joint structure suitable for prefabricated beam. BACKGROUND
[0002] In the process of urban development and construction, prefabricated beam has been widely used. The traditional site pouring operation method is not as efficient as the prefabricated pedestrian bridge in terms of material saving, energy saving and emission reduction, seasonal construction influence, construction period, safety management and quality control. In the factory, prefabricated bridge components and accessories are prefabricated, then transported to the construction site, and assembled and installed on site through reliable connection method, which greatly reduces the site pouring operation and improves the operation efficiency and saves the construction period.
[0003] However, after the prefabricated beam is installed on site, wet joints need to be made between the beams. The current method is to use wooden formwork and tensioning screw rods, which not only has complicated process, but also has a great impact on normal traffic during formwork dismantling. Therefore, a formwork dismantling-free prefabricated beam wet joint construction method is needed to reduce the formwork dismantling step and ensure the normal operation of urban traffic. UTILITY MODEL CONTENT
[0004] To solve the technical problems in the prior art, the utility model provides a formwork dismantling-free wet joint structure suitable for prefabricated beam, which can reduce the formwork dismantling step.
[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:
[0006] A formwork dismantling-free wet joint structure suitable for prefabricated beam is located between adjacent prefabricated beams, comprising UHPC truss plate, tensioning screw rod, steel pipe, wet joint steel bar and concrete layer. The UHPC truss plate comprises UHPC bottom plate and truss bar embedded in the UHPC bottom plate at the lower end. The steel pipe arranged in length direction along left and right direction is erected between adjacent prefabricated beams, the truss bar is fixed on the steel pipe through the tensioning screw rod, and the UHPC bottom plate is located below the two adjacent prefabricated beams and closely attached to the two prefabricated beams, so that the space for binding wet joint steel bar and pouring concrete layer is formed between the two prefabricated beams and the UHPC bottom plate.
[0007] As a preferred embodiment, the truss bar comprises upper chord, lower chord and web. The lower end of the web is embedded in the UHPC bottom plate. Above the UHPC bottom plate, a plurality of webs are arranged in columns along the left and right directions. One column of webs is connected by one upper chord arranged in length direction along the left and right directions and two lower chords arranged in length direction along the left and right directions. A plurality of columns of webs are arranged in sequence along the front and back directions.
[0008] As a kind of preferred, the side of prefabricated beam protrudes multiple groups of reserved steel bars, and the reserved steel bars are staggered with truss bars in the front-back direction;The reserved steel bars are welded with lower chord bars.
[0009] As a kind of preferred, the thickness of UHPC bottom plate is 1.5 cm, the diameter of upper chord bar is 8 mm, the diameter of lower chord bar is 8 mm, and the diameter of web bar is 6 mm.
[0010] As a kind of preferred, the tensioning screw is welded on the truss bar, and the tensioning screw and the steel pipe are locked by mountain-shaped lock.
[0011] As a kind of preferred, in the left-right direction, the length of UHPC bottom plate is greater than the length of wet joint, so that UHPC bottom plate is tightly attached to the adjacent two prefabricated beams, and the edge of UHPC bottom plate is attached with a stop strip for preventing slurry leakage during pouring.
[0012] As a kind of preferred, in the left-right direction, the length of UHPC bottom plate is greater than the length of wet joint, so that UHPC bottom plate is tightly attached to the adjacent two prefabricated beams, and the edge of UHPC bottom plate is attached with a stop strip for preventing slurry leakage during pouring.
[0013] As a kind of preferred, corresponding to one UHPC truss plate, at least two steel pipes are arranged, and the steel pipes are arranged in sequence along the front-back direction;Corresponding to one steel pipe, at least two tensioning screws are arranged, and the tensioning screws are arranged in sequence along the left-right direction.
[0014] As a kind of preferred, after pouring, the steel pipe is removed, and the UHPC truss plate and the tensioning screw are reserved.
[0015] As a kind of preferred, the UHPC truss plate is a prefabricated structure.
[0016] The principle of the utility model is: using the characteristics of UHPC truss plate with truss bar and UHPC bottom plate with light weight and high strength, the UHPC truss plate is used as a wet joint removable formwork, which is convenient for construction and installation.
[0017] The utility model has the following advantages:
[0018] 1. The removable formwork design is adopted, the construction process is reduced, and the construction speed is increased. For the project located above the traffic artery in the city, the traffic blockage caused by formwork removal can be reduced, the traffic measure cost can be greatly reduced, and the construction cost can be saved.
[0019] 2. UHPC super high performance concrete is adopted, the thickness of UHPC bottom plate is thin, and each plate is light in weight, so that the installation is convenient.
[0020] 3. UHPC super high performance concrete is adopted, the strength of UHPC truss plate is high, and the risk of formwork explosion is reduced.
[0021] 4. The UHPC truss slab is a prefabricated structure, the truss rib is prefabricated when leaving the factory, the number of site welding steel bars is reduced, and construction is facilitated.
[0022] 5. The pull screw and the steel pipe are locked through the mountain-shaped lock buckle, and are convenient to assemble and disassemble.
[0023] 6. The slurry stopping strip and the foam glue are arranged, and slurry leakage is prevented. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 is a schematic view of a formwork-free wet joint structure.
[0025] Figure 2 is Figure 1 a partial enlarged view.
[0026] Figure 3 is a perspective view of the UHPC truss slab.
[0027] Figure 4 is a structural schematic view of the UHPC truss slab.
[0028] In the figure, 1 is a prefabricated beam, 2 is a UHPC bottom plate, 3 is a truss rib, 4 is a pull screw, 5 is a steel pipe, 6 is a concrete layer, and 7 is a slurry stopping strip.
[0029] 31 is an upper chord rib, 32 is a lower chord rib, and 33 is a web rib. DETAILED DESCRIPTION
[0030] The utility model will be further explained in detail in combination with specific implementation manners.
[0031] A formwork-free wet joint structure suitable for a prefabricated beam is located between adjacent prefabricated beams and comprises a UHPC truss slab, a pull screw, a steel pipe, wet joint steel bars and a concrete layer. The UHPC truss slab comprises a UHPC bottom plate and truss ribs embedded in the UHPC bottom plate at lower ends. The steel pipe arranged in the length direction along the left-right direction is arranged between the adjacent prefabricated beams, the truss ribs are fixed on the steel pipe through the pull screw, and the UHPC bottom plate is located below the two adjacent prefabricated beams and closely contacts the two prefabricated beams, so that a space for binding the wet joint steel bars and pouring the concrete layer is formed between the two prefabricated beams and the UHPC bottom plate.
[0032] The truss rib comprises an upper chord rib, a lower chord rib and a web rib. The lower end of the web rib is embedded in the UHPC bottom plate. Above the UHPC bottom plate, a plurality of web ribs are arranged in a row along the left-right direction. One row of web ribs is connected through one upper chord rib arranged in the length direction along the left-right direction and two lower chord ribs arranged in the length direction along the left-right direction. A plurality of rows of web ribs are arranged in sequence along the front-rear direction.
[0033] The side of the precast beam protrudes a plurality of sets of reserved steel bars, and the reserved steel bars are staggered with the truss bars in the front-rear direction; the reserved steel bars are welded with the lower chord bars.
[0034] The UHPC bottom plate has a thickness of 1.5 cm, the upper chord bar has a diameter of 8 mm, the lower chord bar has a diameter of 8 mm, and the web bar has a diameter of 6 mm.
[0035] The tension screw is welded on the truss bar, and the tension screw and the steel pipe are locked by a mountain-shaped lock. The tension screw and the mountain-shaped lock can be directly purchased.
[0036] In the left-right direction, the length of the UHPC bottom plate is greater than the length of the wet joint, so that the UHPC bottom plate is tightly attached to the two adjacent precast beams, and the edge of the UHPC bottom plate is attached with a stop strip for preventing slurry leakage during pouring. The UHPC bottom plate and the precast beam wing plate have a certain contact area to completely contain the concrete in the upper wet joint.
[0037] In the left-right direction, the length of the UHPC bottom plate is greater than the length of the wet joint, so that the UHPC bottom plate is tightly attached to the two adjacent precast beams, and the contact position of the UHPC bottom plate and the precast beam is sprayed with a foam glue for preventing slurry leakage during pouring.
[0038] Corresponding to one UHPC truss plate, at least two steel pipes are arranged, and the steel pipes are arranged in sequence along the front-rear direction; corresponding to one steel pipe, at least two tension screws are arranged, and the tension screws are arranged in sequence along the left-right direction. In this embodiment, corresponding to one UHPC truss plate, two steel pipes are arranged; and corresponding to one steel pipe, two tension screws are arranged.
[0039] After pouring is completed, the steel pipes are removed, and the UHPC truss plate and the tension screw are reserved. Because the precast beam and the upper wet joint will be subjected to other construction steps in the future, the upper end of the tension screw can not be treated.
[0040] The UHPC truss plate is a prefabricated structure. When the UHPC truss plate is designed, the collision between the truss bars of the UHPC truss plate and the reserved steel bars of the precast beam needs to be considered.
[0041] The implementation process is as follows:
[0042] The prefabricated beam and the UHPC truss plate are first produced in a factory, the prefabricated beam is positioned, and then the UHPC truss plate is transported to a site for installation. When the UHPC truss plate is installed, the reserved steel bars and the lower chord bars protruding from the side of the prefabricated beam are welded as pre-fixing, and the tensioning screw rod and the truss bars are welded and fixed. Two steel pipes are arranged above the two adjacent prefabricated beams, and the tensioning screw rod is locked with the steel pipes through a mountain-shaped lock buckle. Foam glue is sprayed and a paste gasket is attached to prevent slurry leakage during pouring. After the UHPC truss plate is fixed, the wet joint steel bars are bound and the concrete is poured, which is the same as the prior art. Finally, the auxiliary fixed steel pipes are removed, and the UHPC truss plate and the tensioning screw rod become a part of the wet joint and are permanently left in the wet joint.
[0043] The above embodiment is a preferred embodiment of the present application, but the embodiment of the present application is not limited by the above embodiment, and any change, modification, replacement, combination, simplification made without departing from the spirit and principle of the present application should be an equivalent replacement method, which is included in the protection scope of the present application.
Claims
1. A form-tie wet joint structure suitable for use with precast beams, located between adjacent precast beams, characterized in that: The UHPC truss plate, the tension screw rod, the steel pipe, the wet joint steel bar and the concrete layer are included; the UHPC truss plate includes the UHPC bottom plate and the truss rib embedded in the UHPC bottom plate at the lower end; the steel pipe arranged in the length direction along the left-right direction is arranged between the adjacent prefabricated beams, the truss rib is fixed on the steel pipe through the tension screw rod, the UHPC bottom plate is located below the two adjacent prefabricated beams and closely contacts the two prefabricated beams, so that the space for binding the wet joint steel bar and pouring the concrete layer is formed between the two prefabricated beams and the UHPC bottom plate; the tension screw rod is welded on the truss rib, the tension screw rod and the steel pipe are locked through the mountain-shaped lock; at least two steel pipes are arranged corresponding to one UHPC truss plate, and the steel pipes are arranged in sequence along the front-back direction; at least two tension screw rods are arranged corresponding to one steel pipe, and the tension screw rods are arranged in sequence along the left-right direction; after pouring, the steel pipe is removed, and the UHPC truss plate and the tension screw rod are reserved.
2. A dry-cast form wet joint structure for use in precast beams according to claim 1, wherein: The truss rib includes the upper chord, the lower chord and the web; the lower end of the web is embedded in the UHPC bottom plate; above the UHPC bottom plate, a plurality of webs are arranged in a column along the left-right direction, one column of webs is connected through one upper chord arranged in the length direction along the left-right direction and two lower chords arranged in the length direction along the left-right direction, and a plurality of columns of webs are arranged in sequence along the front-back direction.
3. A dry-cast form-tie wet-joint structure for precast beams according to claim 2, wherein: The side of the prefabricated beam extends a plurality of groups of reserved steel bars, and the reserved steel bars are staggered with the truss rib in the front-back direction; the reserved steel bars are welded with the lower chord.
4. A dry-cast form-tie wet-joint structure for precast beams according to claim 2, wherein: The thickness of the UHPC bottom plate is 1.5 cm, the diameter of the upper chord is 8 mm, the diameter of the lower chord is 8 mm, and the diameter of the web is 6 mm.
5. A dry-cast form-tie wet-joint structure for precast beams according to claim 1, wherein: In the left-right direction, the length of the UHPC bottom plate is greater than the length of the wet joint, so that the UHPC bottom plate closely contacts the two adjacent prefabricated beams, and the edge of the UHPC bottom plate is provided with a stop strip for preventing slurry leakage during pouring.
6. A dry-cast form wet joint structure for use in precast beams according to claim 1, wherein: In the left-right direction, the length of the UHPC bottom plate is greater than the length of the wet joint, so that the UHPC bottom plate closely contacts the two adjacent prefabricated beams, and the contact position of the UHPC bottom plate and the prefabricated beam is sprayed with foam glue for preventing slurry leakage during pouring.
7. A dry-cast form wet joint structure for use in precast beams according to claim 1, wherein: The UHPC truss plate is a prefabricated structure.