Dismantling-free anchor groove mold for slow-bonding prestressed tendon tensioning end

Abstract

The utility model relates to a kind of dismantling-free anchor groove mould for slow-bonding prestressed tendon tensioning end.The tensioning end anchor groove mould plate is usually wood mould plate currently, and wood anchor groove mould has the problems of high manufacturing cost, inaccurate anchor groove positioning, slurry leakage in anchor groove, need to dismantle after anchor groove forming, and anchor groove wall needs to be chiseled.The utility model includes anchor groove bottom plate, side mould plate, anchor groove cover plate and multiple steel bar buckles;The anchor groove bottom plate is arranged at the tensioning end of slow-bonding prestressed tendon;The side mould plate is arranged at the upper end of the anchor groove bottom plate and is fixed by the steel bar buckles, one end of the steel bar buckles is arranged at the top of the side mould plate, and the other end is arranged at the bottom of the anchor groove bottom plate;The anchor groove cover plate is arranged at the upper end of the side mould plate.Each component of the utility model can be prefabricated in factory, and the mould plate is assembled on site during construction, the anchor groove wall is free from chiseling, the manufacturing and construction cost is low, the positioning is accurate during construction and installation, and slurry leakage in anchor groove is difficult.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a non-removable anchor groove mold for the tensioning end of a slow-bonding prestressed tendon. Background Technology

[0002] Traditional bonded prestressed anchor channels rely on corrugated pipe drilling and grouting processes, which involve complex construction procedures (requiring grouting and curing) and numerous quality risks (incomplete grouting leading to corrosion). While unbonded prestressed anchor channels are simple to construct, they have poor seismic performance (slippage reaches 20-30mm) and cannot meet high seismic fortification requirements. In recent years, delayed-bonding prestressing technology has emerged. This technology achieves "free sliding during construction + effective bonding during service" through delayed-setting adhesives, combining the construction convenience of unbonded anchor channels with the mechanical properties of bonded anchor channels.

[0003] With the widespread application of slow-bonding prestressing technology in various fields, the quality and cost issues of tension end anchor groove fabrication have become increasingly prominent. Currently, tension end anchor groove templates are usually made of wood. Wooden anchor groove templates have problems such as high production cost, inaccurate anchor groove positioning, easy grout leakage in the anchor groove, need to dismantle the template after the anchor groove is formed, and need to roughen the anchor groove wall.

[0004] Therefore, there is an urgent need for a low-cost anchor groove mold for the tensioning end of the prestressed tendon that is accurate in anchor groove positioning, does not easily leak grout in the anchor groove, does not require demolding after the anchor groove is formed, and does not require roughening of the anchor groove wall. Summary of the Invention

[0005] The purpose of this invention is to provide a non-removable anchor groove mold for the tensioning end of a prestressed tendon with a slow-bonding structure, so as to at least solve the problems of high cost, inaccurate positioning, easy leakage of grout in the anchor groove, need to remove the mold after the anchor groove is formed, and need to roughen the wall of the anchor groove.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A non-removable anchor groove formwork for the tensioning end of a slow-bonding prestressed tendon includes an anchor groove bottom plate, side templates, an anchor groove cover plate, and multiple rebar clips;

[0008] The anchor groove bottom plate is set at the tensioning end of the loosely bonded prestressing tendon;

[0009] The side template is set on the upper part of the anchor groove bottom plate and fixed by the steel bar buckle. One end of the steel bar buckle is set on the top of the side template and the other end is set on the bottom of the anchor groove bottom plate.

[0010] The anchor groove cover is located on the upper end of the side template.

[0011] Furthermore, the anchor groove bottom plate is cylindrical or cuboid, and a first through hole is provided on the anchor groove bottom plate, the number of which is one or more.

[0012] Furthermore, the side template is cylindrical or cuboid, and has a through hole in the middle.

[0013] Furthermore, the side template has a stop groove at the bottom and multiple positioning grooves at the top.

[0014] Furthermore, the anchor groove cover plate includes a hollow cover body and a stop boss, both ends of the hollow cover body are open, and the stop boss is disposed at the lower end of the hollow cover body.

[0015] Furthermore, the bottom of the stop boss is provided with a second through hole corresponding to the first through hole.

[0016] Furthermore, the steel bar buckle includes a vertical rod, a short rod, and a long rod, with the short rod and the long rod respectively connected to the upper and lower ends of the vertical rod via adapters.

[0017] Furthermore, the upper surface of the side template is lower than the concrete end surface.

[0018] Furthermore, the upper end face of the anchor groove cover is higher than the concrete end face.

[0019] Furthermore, a sealing cap is provided at the upper end of the anchor groove cover plate.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This utility model provides a non-removable anchor groove mold for the tensioning end of a slow-bonded prestressed tendon, including an anchor groove bottom plate, side templates, an anchor groove cover plate, and rebar clips. All components can be prefabricated in the factory and assembled on-site during construction, eliminating the need for template removal and roughening the anchor groove walls. This reduces construction steps, lowers manufacturing and construction costs, and improves economic efficiency. Furthermore, the factory-made anchor groove mold has precise dimensions and accurate positioning during construction and installation, preventing grout leakage and ensuring high-quality anchor grooves. The factory prefabrication and compact size of this utility model facilitate installation and effectively reduce the need to cut ordinary rebars when arranging anchor grooves. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a structural diagram of Example 1 during construction;

[0024] Figure 2This is a schematic diagram of the anchor sealing in Example 1;

[0025] Figure 3 This is a structural schematic diagram of Example 1 viewed from below;

[0026] Figure 4 This is a top view of the structure of Embodiment 1;

[0027] Figure 5 This is a schematic diagram of the anchor groove bottom plate in Example 1;

[0028] Figure 6 This is a schematic diagram of the bottom structure of the side template in Example 1;

[0029] Figure 7 This is a schematic diagram of the top structure of the side template in Example 1;

[0030] Figure 8 This is a schematic diagram of the top structure of the anchor groove cover plate in Embodiment 1;

[0031] Figure 9 This is a schematic diagram of the bottom structure of the anchor groove cover plate in Embodiment 1;

[0032] Figure 10 This is a structural schematic diagram of the rebar clip in Example 1;

[0033] Figure 11 This is a schematic diagram of the sealing cap structure in Example 2;

[0034] Figure 12 This is a schematic diagram of the anchor groove bottom plate in Example 3;

[0035] Figure 13 This is a schematic diagram of the structure of Example 3;

[0036] Figure 14 This is a schematic diagram of the anchor groove bottom plate in Example 4;

[0037] Figure 15 This is a structural schematic diagram of Example 4;

[0038] The diagram is labeled as follows:

[0039] 1-Anchor groove bottom plate, 2-Side template, 3-Anchor groove cover plate, 31-Hollow cover body, 32-Stop boss, 4-Rebar buckle, 5-Sealing cover, 6-Slow-bonding prestressing tendon, 7-Helical reinforcement, 8-Tensioning end anchor. Detailed Implementation

[0040] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0041] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] Furthermore, in the description of this utility model, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Of course, such terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than those illustrated or described herein.

[0044] Example 1:

[0045] This embodiment provides a non-removable anchor groove mold for the tensioning end of a slow-bonding prestressed tendon, including an anchor groove bottom plate 1, side templates 2, an anchor groove cover plate 3, and four rebar clips 4. The anchor groove bottom plate 1, side templates 2, anchor groove cover plate 3, and rebar clips 4 can all be prefabricated in the factory.

[0046] Specifically, the anchor groove bottom plate 1 is a steel bearing plate, and the anchor groove bottom plate 1 is set at the tensioning end of the loosely bonded prestressing tendon 6.

[0047] In this embodiment, the anchor groove bottom plate 1 is cylindrical, and a first through hole for the slow-bonding prestressing tendon 6 to pass through is provided on the anchor groove bottom plate 1.

[0048] Specifically, side formwork 2 is a precast, non-removable formwork made of high-toughness fiber concrete. The high-toughness fiber concrete is made of P42.5 ordinary Portland cement, Grade I fly ash, quartz sand and fiber. The fiber volume content is 2%, and the fiber is polypropylene fiber. It is required that the fiber paste of the mixed concrete does not clump or agglomerate, the fiber is fully dispersed, the mortar flowability diameter of the mixture is controlled at (180±10) mm, the Grade I fly ash content is 30%, and the water-cement ratio is 0.25.

[0049] The side template 2 is set on the upper end of the anchor groove bottom plate 1 and fixed by the steel bar buckle 4. One end of the steel bar buckle 4 is set on the top of the side template 2 and the other end is set on the bottom of the anchor groove bottom plate 1.

[0050] The side formwork 2 is cylindrical with a through hole in the middle. The cross-section of the through hole is circular. The inner and outer surfaces of the side formwork 2 are roughened to enhance the bonding between the new and old concrete. The bottom of the side formwork 2 is provided with a stop groove for positioning with the anchor bottom plate 1. The anchor bottom plate 1 is installed in the stop groove. The top of the side formwork 2 is provided with four positioning grooves for positioning the reinforcing bar buckles 4 at even intervals. The vertical cross-section of the positioning groove is a semi-circle with the arc facing downward.

[0051] In this embodiment, the wall thickness of the side template 2 is 15mm to 25mm.

[0052] Specifically, the steel bar buckle 4 includes a vertical rod, a short rod, and a long rod. All three rods are cylindrical. The short rod and the long rod are connected to the upper and lower ends of the vertical rod through adapters. The adapters are arc-shaped. The short rod and the adapter, the adapter and the vertical rod, and the long rod and the adapter are all fixed by welding. The short rod is embedded in the positioning groove of the side template 2, and the long rod is welded and fixed to the bottom of the anchor groove bottom plate 1, thereby fixing the side template 2 to the anchor groove bottom plate 1.

[0053] Anchor groove cover plate 3 is set on the upper end of side template 2. Anchor groove cover plate 3 is made by plastic injection molding, and polypropylene and ABS plastic are preferred as injection molding materials.

[0054] The anchor groove cover plate 3 includes a hollow cover body 31 and a stop boss 32. The hollow cover body 31 is a cylinder with openings at both ends. The stop boss 32 is integrally set at the lower end of the hollow cover body 31. The diameter of the stop boss 32 is smaller than the diameter of the hollow cover body 31. The stop boss 32 is used to connect with the upper end of the side template 2. The diameter of the stop boss 32 is smaller than the diameter of the through hole of the side template 2, and the diameter of the hollow cover body 31 is larger than the diameter of the through hole of the side template 2. Thus, the stop boss 32 is set inside the side template 2, and the hollow cover body 31 is locked at the upper end of the side template 2.

[0055] In this embodiment, the bottom of the stop boss 32 is provided with a second through hole corresponding to the first through hole, which is used to allow the slow-bonding prestressing tendon 6 to pass through. The transverse cross-section of the first through hole and the second through hole are both circular, and the diameter of the first through hole and the second through hole are both 2mm to 4mm larger than the outer diameter of the slow-bonding prestressing tendon 6.

[0056] The upper end of the side formwork 2 is 15mm to 50mm lower than the concrete end face, so that the side formwork 2 is embedded in the concrete, and the upper end of the anchor groove cover plate 3 is more than 10mm higher than the concrete end face.

[0057] The construction process in this embodiment is as follows:

[0058] 1. Welding of the positioning bars for the slow-bonding prestressed tendons

[0059] Weld the positioning reinforcement at position 6 of the slow-bonding prestressing tendon on the design drawing.

[0060] 2. Install the slow-bonding prestressed tendons (if it is single-end tensioning, including fixed-end anchorages, bearing plates, and spiral reinforcement accessories).

[0061] The prestressed tendons 6, which have been cut to a fixed length and bonded slowly (if it is a single-end tensioning, the extrusion of the fixed end anchorage is also required), are threaded onto the positioning tendons and tied. The fixed end anchorage is tightly attached to the bottom plate 1 of the anchor groove.

[0062] 3. Install the tensioning end spiral reinforcement and the anchorage formwork that can be removed.

[0063] according to Figure 1 As shown, assemble the non-removable anchor groove formwork, and weld the steel bar buckle 4 to the anchor groove bottom plate 1. The spiral bar 7 is close to the lower end of the anchor groove bottom plate 1 and is welded and fixed after being aligned with the first through hole. Install the non-removable anchor groove formwork on the tensioning end of the slow-bonding prestressing tendon 6. After installation and positioning, weld the anchor groove bottom plate 1 to the ordinary steel cage with steel bars.

[0064] 4. Pouring concrete

[0065] After the installation of the slow-bonding prestressing tendon 6 and the non-removable anchor groove formwork is completed, the concealed works inspection shall be carried out. Concrete can only be poured after it is confirmed to be qualified. When pouring concrete, it is strictly forbidden to step on or collide with the slow-bonding prestressing tendon 6, the positioning tendon and the non-removable anchor groove formwork.

[0066] 5. Prestressing tensioning

[0067] Prestressing tensioning is completed within the tensioning service period of the loosely bonded prestressing tendon 6. The concrete strength grade should reach the design strength during tensioning. Gently tap the anchor groove cover plate 3 to loosen the anchor groove cover plate 3 from the concrete, then remove the anchor groove cover plate 3. Peel off the sheath of the loosely bonded prestressing tendon 6 above the bottom plate 1 of the tensioning end anchor groove and clean the retarding adhesive. Install the tensioning end anchor 8. The prestressing tensioning adopts the dual control method, that is, controlling the tension force while checking the elongation value of the loosely bonded prestressing tendon 6.

[0068] 6. Anchoring

[0069] After the tensioning and anchoring of the loosely bonded prestressing tendon 6, the tensioning record and anchoring condition are reviewed. After confirming that they are qualified, the excess loosely bonded prestressing tendon 6 is cut off using an abrasive wheel saw or other mechanical methods. The length of the loosely bonded prestressing tendon 6 exposed outside the anchor wedge after cutting shall not be less than 30mm and shall not be less than 1.5 times the diameter of the loosely bonded prestressing tendon 6. Clean the end face of the bottom plate 1 of the tensioning end anchor groove, the tensioning end anchor 8, and the loosely bonded prestressing tendon 6 of the tensioning end. Apply epoxy resin to the loosely bonded prestressing tendon 6 and the tensioning end anchor 8 for anti-corrosion treatment. Seal the anchor groove with micro-expansion fine stone concrete or non-shrinkage mortar of the same grade.

[0070] Example 2:

[0071] In this embodiment, a sealing cover 5 is provided at the upper end of the anchor groove cover plate 3 to prevent dust. The sealing cover 5 has a third through hole corresponding to the first through hole and the second through hole. The sealing cover 5 is injection molded and can be reused. Polypropylene and ABS plastic are preferred as injection molding materials.

[0072] Example 3:

[0073] In this embodiment, the anchor groove bottom plate 1 is a cuboid, and the side template 2 is a cuboid. The transverse cross-section of the through hole of the side template 2 is rectangular. The hollow cover 31 and the stop boss 32 of the anchor groove cover plate 3 are both cuboids.

[0074] Example 4:

[0075] In this embodiment, the anchor groove bottom plate 1 is a cuboid with two first through holes. The side template 2 is a cuboid with a rectangular cross-section for the through holes. The hollow cover 31 and the stop boss 32 of the anchor groove cover plate 3 are both cuboids. The stop boss 32 has two second through holes corresponding to the first through holes, so that two slow-bonding prestressing tendons 6 can be installed. In other embodiments, the number of first and second through holes can be three or four, and is not limited thereto.

[0076] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A non-removable anchor groove mold for the tensioning end of a slow-bonding prestressed tendon, characterized in that: It includes the bottom plate of the anchor groove (1), the side formwork (2), the anchor groove cover plate (3) and multiple steel bar clips (4); The anchor bottom plate (1) is set at the tensioning end of the loosely bonded prestressed tendon (6); The side template (2) is set on the upper end of the anchor groove bottom plate (1) and fixed by the steel bar buckle (4). One end of the steel bar buckle (4) is set on the top of the side template (2) and the other end is set on the bottom of the anchor groove bottom plate (1). The anchor groove cover plate (3) is set on the upper end of the side template (2).

2. The non-removable anchor groove mold for the tensioning end of a slow-bonding prestressed tendon according to claim 1, characterized in that: The anchor groove bottom plate (1) is cylindrical or cuboid, and the anchor groove bottom plate (1) is provided with a first through hole, the number of which is one or more.

3. The non-removable anchor groove mold for the tensioning end of a slow-bonding prestressed tendon according to claim 1, characterized in that: The side template (2) is cylindrical or cuboid, and has a through hole in the middle.

4. The anchor groove mold for the tensioning end of a slow-bonding prestressed tendon as described in claim 1, characterized in that: The side template (2) has a stop groove at the bottom and multiple positioning grooves at the top.

5. The anchor groove mold for the tensioning end of a slow-bonding prestressed tendon as described in claim 2, characterized in that: The anchor groove cover plate (3) includes a hollow cover body (31) and a stop boss (32). Both ends of the hollow cover body (31) are open, and the stop boss (32) is located at the lower end of the hollow cover body (31).

6. The anchor groove mold for the tensioning end of a slow-bonding prestressed tendon as described in claim 5, characterized in that: The bottom of the stop boss (32) is provided with a second through hole corresponding to the first through hole.

7. The non-removable anchor groove mold for the tensioning end of a slow-bonding prestressed tendon according to claim 1, characterized in that: The steel bar buckle (4) includes a vertical rod, a short rod and a long rod, and the short rod and the long rod are respectively connected to the upper and lower ends of the vertical rod through adapters.

8. The non-removable anchor groove mold for the tensioning end of a slow-bonding prestressed tendon according to claim 1, characterized in that: The upper surface of the side template (2) is lower than the concrete end surface.

9. The non-removable anchor groove mold for the tensioning end of a slow-bonding prestressed tendon according to claim 8, characterized in that: The upper end face of the anchor groove cover plate (3) is higher than the concrete end face.

10. The non-removable anchor groove mold for the tensioning end of a slow-bonding prestressed tendon according to claim 1, characterized in that: The upper end of the anchor groove cover plate (3) is provided with a sealing cover (5).

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