Pre-stressed concrete T-beam wet joint non-dismantling formwork construction structure
By installing a stacked integrated panel under the wet joints, the problem of lack of mold-free technology in the construction of existing wet joints is solved, and the formwork is not demolition-free and construction efficiency is improved, while the surface quality and corrosion resistance of the wet joints are improved.
Patent Information
- Application Number
- CN202422283080.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-19
AI Technical Summary
The lack of mold removal technology in the existing wet joint construction process leads to danger in the mold removal process and requires secondary grouting treatment to prevent seepage and leakage.
The wet joint free formwork construction structure of prestressed concrete T-beam is adopted. The stacked integrated plate is fixedly installed below the wet joint. The stacked integrated plate is composed of galvanized pressed steel plates and welded steel bar trusses to form a three-dimensional spatial structure, tied to form an integral, and suspended and installed to achieve the fixation and leakage prevention of the formwork.
The formwork is free from dismantling, which improves construction efficiency, reduces project cost, and improves the surface quality and corrosion resistance of wet joints.
Smart Images
Figure CN223047934U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of highway construction. Background Art
[0002] Reference Figure 1 At present, the existing wet joint construction plan is as follows: The steel bars processed at the erection yard are transported under the bridge, and the construction workers on the beam use pulleys to hoist the steel bars onto the beam. The construction workers bind the steel bars according to the wet joint steel bar layout drawing and bind the steel bars according to the requirements of the design drawing.
[0003] Before binding, the steel bars that do not meet the requirements are removed, and the rust spots on the steel bars are treated; the stirrups are vertically tightened around the longitudinal bars, and the intersection points of the stirrups and the longitudinal bars are tied with wire.
[0004] After binding, the support of the wet joint formwork is carried out. Specifically, the wet joint formwork adopts bamboo plywood 01 with a thickness of 1 cm, and each piece has a specification of 1.2 m (length) × 0.4 m (width). It is suspended and tied to the deck slab steel bars with wire, and a bolt assembly 02 is used to suspend the wet joint formwork. The upper part of the bolt is fixed on the transverse square timber. Both ends of the above-mentioned transverse square timber are respectively lapped on the precast T-beams on both sides through cushion blocks. The above-mentioned transverse square timber should be supported strictly according to the standard drawing. After the support is completed, concrete is poured. During the pouring process, the mixed concrete is transported to the pouring site by a concrete transport truck, poured into the hopper, and hoisted to the beam surface by a truck crane and unloaded on the trolley, and then manually poured at the construction part.
[0005] Formwork removal: After the wet joint hardens to meet the requirements, formwork removal is carried out. First, the upper cross diaphragm and bolt assembly are removed, and then the bamboo plywood is removed. The removal of the upper cross diaphragm is relatively simple and easy to implement. The lower bamboo plywood is located under the bridge and has a certain distance from the ground, which belongs to high-altitude operation. Due to the limitation of the space under the bridge, a hoisting vehicle cannot be used for assistance, and a scaffold or a recommended lifting platform needs to be used. Therefore, there is a certain danger in formwork removal.
[0006] It can be seen that the existing process flow is: preparation work → binding of steel bars → erection of formwork → pouring of wet joint → curing → removal of formwork.
[0007] At the same time, the perforations of the bolt assembly formed after formwork removal need to be grouted for the second time, and it is required to achieve anti-seepage and anti-leakage.
[0008] Based on the above problems, the utility model studies a wet joint construction structure that does not require formwork removal. Summary of the Utility Model
[0009] In order to solve the deficiencies of the existing technology, the utility model provides a prestressed concrete T-beam wet joint formwork-free construction structure, which is used to solve the problem of the lack of formwork-free technology in the wet joint construction process.
[0010] The technical solution adopted by the utility model to solve its technical problems is as follows:
[0011] The construction structure of the prestressed concrete T-beam wet joint with a non-removable formwork includes a beam body and a wet joint arranged between two beam bodies. It is characterized in that a laminated integrated board is fixedly installed below the wet joint. The laminated integrated board is composed of a galvanized profiled steel sheet and a steel bar truss welded to the galvanized profiled steel sheet. The steel bar truss with a three-dimensional spatial structure is composed of transverse bars with continuous S-bends and longitudinal bars perpendicular to the transverse bars. The steel bar truss is tied to the lapping bars on the side of the beam body to form a whole.
[0012] Furthermore, there are welding points or welding sections between the transverse bars and the galvanized profiled steel sheet.
[0013] Furthermore, the longitudinal bars are arranged along the length direction of the wet joint and have a long continuous length.
[0014] Furthermore, the lapping width of the galvanized profiled steel sheet with the two side beam bodies is not less than 20 cm.
[0015] Furthermore, the edge of the galvanized profiled steel sheet where the lapping width is located has an inner bend.
[0016] Furthermore, the lapping bars between the two side beam bodies are connected by welding or tying.
[0017] Furthermore, the laminated integrated board is connected to the bottom surface of the beam body through steel nails and gaskets.
[0018] Furthermore, transverse wooden beams are arranged on the beam body above the wet joint. The two ends of the transverse wooden beams are supported by cushion woods and are suspended and installed between the transverse wooden beams and the steel bar truss.
[0019] Furthermore, the suspension points are located at the welding and bonding points of the transverse bars and longitudinal bars of the steel bar truss.
[0020] Furthermore, the side surfaces of the beam bodies on both sides of the wet joint are roughened surfaces.
[0021] The beneficial effects of the utility model are as follows:
[0022] The implementation of this technology enables the laminated integrated board to not only play the role of a formwork but also play the role of an integrated board, achieving the effect of non-removable formwork.
[0023] The implementation of this technology can quickly fix the laminated integrated board at the construction site, and then carry out simple steel bar works, and then concrete can be poured, improving the construction efficiency of the floor slab, and saving the cost of formwork disassembly and installation, and effectively reducing the project cost.
[0024] This technology is applied to the wet joint through the laminated integrated board, which further improves the surface quality of the lower surface of the wet joint and has a higher surface quality than the traditional form removal construction, thus enhancing the surface quality of the construction.
[0025] After the construction of this technology is completed, the galvanized profiled steel sheet forms a kind of protection under the wet joint, which has a good effect on preventing the corrosion and cracking of the wet joint. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is the wet joint construction scheme in the prior art.
[0027] Figure 2 It is the wet joint construction scheme of the present utility model.
[0028] Figure 3 It is the three-dimensional view of the laminated integrated board.
[0029] Figure 4 It is the effect diagram after the construction of the present utility model.
[0030] Figure 5 It is Figure 2 the partial enlarged view of.
[0031] In the figure:
[0032] 01 Bamboo plywood,
[0033] 10 Beam body,
[0034] 20 Laminated integrated board, 21 Galvanized profiled steel sheet, 211 Inner bend, 22 Steel bar truss, 221 Cross bar, 222 Longitudinal bar,
[0035] 30 Steel nails,
[0036] 40 Transverse square timbers, 41 Cushion timbers, 42 Steel wires,
[0037] 50 Concrete. SPECIFIC EMBODIMENTS
[0038] A certain bridge has a total of 64 cast-in-place wet joints and 232 wet seams. It adopts a structure system of prefabricating multiple beams separately, simply supported installation, and cast-in-place continuous joints. The construction process of its system conversion is as follows:
[0039] Prefabricate the main beams in sequence, tension the prestressed steel strands in the positive bending area and inject cement slurry, set up temporary supports and install permanent supports, install the main beams hole by hole, tie the crossbeam steel bars, set the joint plate bundle corrugated pipes and pass the bundles, cast the continuous joints, the middle cross beam and the bridge decks on both sides of the top plate within the same length range of the negative bending bundle, tension the prestressed steel strands of the top plate negative bending, and inject cement slurry. After the construction of the above joints is completed, pour the wet joint concrete of the remaining bridge deck. After the pouring is completed, remove the temporary supports to complete the system conversion.
[0040] During the above construction method, the more detailed construction process of the wet joint is as follows:
[0041] Preparation work → erection of composite integrated slab → tying of steel bars → pouring of wet joints → maintenance, so the implementation of this embodiment omits the process of removing the formwork (composite integrated slab).
[0042] The preparation work refers to roughening, cleaning and spraying water on the surfaces of both sides of the wet joint of the beam body 10 to meet the conditions for pouring secondary concrete.
[0043] The laminated integrated board is erected, and the laminated integrated board 20 is fixed from the bottom of the wet joint, and the laminated integrated board is firmly fixed on the beam body using steel nails 30 + gaskets. In order to improve the effect of preventing grout leakage, a rubber strip is pre-placed at the veneer of the laminated integrated board and the beam body.
[0044] An optimal laminated integrated plate structure, the laminated integrated plate 20 is composed of a galvanized corrugated steel plate 21 and a steel bar truss 22 welded above the galvanized corrugated steel plate, wherein the cross section of the galvanized corrugated steel plate in this embodiment is referenced to Figure 3 , Figure 4 As shown. The steel truss is composed of continuously S-bent transverse bars 221 and longitudinal bars 222 perpendicular to the transverse bars, forming a lattice shape with a three-dimensional spatial structure, and there are welding points or welding sections between the transverse bars and the galvanized corrugated steel sheets below, and the longitudinal bars are arranged along the length direction of the wet joint and have a long continuous length. The longitudinal bars 222 can be overlapped with multiple diameters to form a sufficient length. The galvanized corrugated steel sheet 21 has a sufficiently high overlap width with the beams on both sides. In theory, the overlap width is not less than 20 cm. Furthermore, the edge of the galvanized corrugated steel sheet where the overlap width is located has an inner bend 211, which is conducive to the fixation and installation of the leak-proof sealing strip, thereby improving the convenience of installation.
[0045] Tie the steel bars. After the above-mentioned composite integrated panel 20 is fixed, tie the steel truss in the above-mentioned integrated panel with the lap bars on the side of the beam body in the wet joint. Use thin steel wire or thin iron wire for tying. At the same time, the lap bars 11 of the beam body 10 are welded or tied. Since the high point of the transverse bar 221 in the steel truss is basically at the same height as the lap bars 11, the lap bars and the steel truss form a truss structure with a three-dimensional space and have sufficient strength.
[0046] Then, set a transverse square wood 40 on the beam above the wet joint as a suspension point. Use pads 41 to support the two ends of the transverse wood so that a certain distance is formed between the transverse wood and the wet joint. Use steel wire 42 to tie it to the steel truss below. The best position is at the welding point of the transverse and longitudinal bars for bundling. The steel wire is tied to the transverse wood above, and the laminated integrated board below is in a stable position by tensioning the wire. The above-mentioned steel wire suspension points should be supported strictly according to the standard drawings. For reference, see the effect diagram. Figure 2 and Figure 3 , Figure 5 This measure effectively prevents local deformation of the integrated slab during concrete pouring.
[0047] After pouring the wet joint and supporting, pouring of concrete 50 is carried out. During the pouring process, the mixed concrete is transported to the pouring site by a concrete transport truck, poured into the hopper, and unloaded on a small trolley by a car crane to the beam surface, and poured manually at the construction site. As a preferred method, C50 cast-in-place concrete is used. When using an inserted vibrator, the moving spacing does not exceed 1.5 times the action radius of the vibrator, and a distance of 50㎜ to 100mm is maintained from the laminated integrated plate to avoid collision with the integrated plate, steel truss, and suspension wire. For each vibrating part, it must be vibrated until the concrete at that part is dense. The sign of density is that the concrete stops sinking, no more bubbles emerge, and the surface appears flat.
[0048] After final setting, watering can be used for curing to keep the concrete surface moist. The curing period is not less than 7 days. After the curing is completed, remove the horizontal wood and pads on the top, and remove the excess and exposed steel wire. The effect picture after the construction is completed is for reference. Figure 4 , and the above-mentioned horizontal timbers and pads can be reused for the construction of the next section.
[0049] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements to the present invention by relevant technical personnel in the field should fall within the scope of protection determined by the claims of the present invention.
Claims
1. A prestressed concrete T-beam wet joint formwork-free construction structure, comprising a beam body and a wet joint arranged between two beam bodies, characterized in that: A laminated integrated plate is fixedly installed below the wet joint, and the laminated integrated plate is composed of a galvanized corrugated steel plate and a steel truss welded to the galvanized corrugated steel plate. The steel truss with a three-dimensional spatial structure is composed of continuously S-bent transverse bars and longitudinal bars perpendicular to the transverse bars. The steel truss is tied together with the lap bars on the side of the beam body to form a whole.
2. The prestressed concrete T-beam wet joint formwork-free construction structure according to claim 1 is characterized in that: There are welding points or welding sections between the transverse ribs and the galvanized corrugated steel sheet.
3. The prestressed concrete T-beam wet joint formwork-free construction structure according to claim 2 is characterized in that: The longitudinal reinforcement is arranged along the length direction of the wet joint and has a long continuous length.
4. The prestressed concrete T-beam wet joint formwork-free construction structure according to claim 3 is characterized in that: The overlap width between the galvanized corrugated steel plate and the beams on both sides is not less than 20 cm.
5. The prestressed concrete T-beam wet joint formwork-free construction structure according to claim 4 is characterized in that: The edge of the galvanized corrugated steel sheet where the overlap width is located has an inward bend.
6. The prestressed concrete T-beam wet joint formwork-free construction structure according to claim 1 is characterized in that: The lap reinforcements on both sides of the beam are connected by welding or binding.
7. The prestressed concrete T-beam wet joint formwork-free construction structure according to claim 1 is characterized in that: The laminated integrated plate is connected to the bottom surface of the beam body through steel nails and gaskets.
8. The prestressed concrete T-beam wet joint formwork-free construction structure according to claim 1 is characterized in that: A transverse square timber is arranged on the beam body above the wet joint, both ends of the transverse square timber are supported by pads, and the transverse square timber is suspended and installed between the transverse square timber and the steel bar truss by steel wire.
9. The prestressed concrete T-beam wet joint formwork-free construction structure according to claim 8, characterized in that: The suspension point is located at the welding joint of the transverse reinforcement and the longitudinal reinforcement of the steel bar truss.
10. The prestressed concrete T-beam wet joint formwork-free construction structure according to claim 1, characterized in that: The side surfaces of the beam body on both sides of the wet joint are roughened surfaces.