Novel hydraulic method I-beam tensioning slow-release device

Abstract

The utility model discloses a novel hydraulic method I-shaped beam tensioning slow-release device, which relates to the field of I-shaped beam prefabrication, and adopts the technical scheme that the novel hydraulic method I-shaped beam tensioning slow-release device comprises a mounting seat fixed on a tensioning pedestal, the mounting seat is of a cylindrical structure with an opening at one end, a through hole is formed in the middle of the closed end of the mounting seat, and a through steel bar with external threads on the outer wall is arranged in the through hole; the two ends of the center penetrating steel bar extend to the two sides of the installation base. The end, close to the tensioning pedestal, of the center penetrating steel bar is detachably connected with the steering gear. The utility model has the beneficial effects that: after concrete curing is completed, when the steering gear is disassembled and removed, the center-penetrating steel bar is slowly released, so that the vertical force of the steering gear in the body and the prestressed tendon is slowly released; the problem that an in-vivo steering gear and a prestressed tendon generate rebound impact force on surrounding concrete due to quick release is well solved, and meanwhile the problem that an anchoring nut is difficult to detach is solved.

Description

Technical Field

[0001] The utility model relates to the field of prefabrication of I-beams, and particularly relates to a novel hydraulic I-beam tensioning and slow-release device. Background Technique

[0002] In the implementation process of pretensioning, only when the tensile force of the prestressed tendons is effectively fixed and fully absorbed in the structure and integrated with the concrete can an ideal effect be obtained. The technical process is relatively complex, especially the process of releasing the tensile stress. The broken-line pretensioning method is a kind of pretensioning method. By arranging deflectors on the tensioning bed, passing the prestressed tendons through the deflectors, and then tensioning the prestressed tendons, the deflection of the prestressed tendons is realized. After the tensioning is completed, the prestressed tendons are anchored, and then the concrete is poured. After the concrete is cured to the specified strength, the anchor is loosened and the prestressed tendons are cut off to form a broken-line reinforcement pretensioned prestressed concrete structure.

[0003] During on-site construction, the deflector is usually connected downward to the bolt, and the bolt is anchored on the bed to fix the deflector. However, when the deflector is disassembled and released after the concrete curing is completed, how to release the bolt upward becomes a key problem. If the bolt is released upward too fast, it will cause an upward rebound impact force on the prestressed tendons, which will generate a local impact force on the concrete around the deflector inside the body, and may even cause internal cracks, thus affecting the quality of the broken-line pretensioned precast beam. The huge tensile force generated by the deflector will also make it difficult to disassemble the bolt.

[0004] The existing technical solution is to loosen the nut under the deflector to achieve the purpose of slow-release pressure. However, when the tensile force is too large during tensioning, a lot of time and manpower are required to loosen the nut. To solve this problem, the existing solution is to connect the wedge-shaped pad to the bolt and position the nut on the two side plates. After the tensioning is completed, by rotating the outer screw of the wedge-shaped pad, the wedge-shaped pad is pulled outward to release the tensile force of the deflector to loosen the nut under the deflector. However, the tensile force brought by the tensioning of the steel strand is too large, and coupled with the limited space during on-site construction, the workers often cannot turn the nut of the wedge-shaped pad, resulting in the failure to play the role of slow-release, and this drawback is currently very difficult to overcome. The workers can only spend a lot of time and energy directly loosening the fixing nut under the deflector. Content of the Utility Model

[0005] In view of the above technical problems, the utility model provides a novel hydraulic I-beam tensioning and slow-release device.

[0006] The technical solution is as follows: it includes a mounting seat fixed on the tensioning bed. The mounting seat is a cylindrical structure with one end open. A through hole is opened in the middle of the closed end of the mounting seat. A through steel bar with an external thread on the outer wall is arranged in the through hole, and both ends of the through steel bar extend to both sides of the mounting seat;

[0007] One end of the through-core steel rod close to the tensioning platform is detachably connected to the diverter.

[0008] Preferably, a hydraulic jack is provided on each side of the through-core steel rod, the hydraulic jack is located in the mounting seat, one end of the two hydraulic jacks abuts against the closed end of the mounting seat, and the other end abuts against a contact plate, and the contact plate is sleeved on the outside of the through-core steel rod;

[0009] A locking nut is arranged on the through-core steel rod, and the locking nut is located on the side of the abutment plate away from the jack.

[0010] Preferably, a pressure plate is provided at the open end of the mounting seat, and the pressure plate is sleeved on the outer side of the through-core steel rod;

[0011] A fastening nut is arranged on the through-core steel rod, and the fastening nut is located on a side of the pressure-bearing plate away from the mounting seat.

[0012] Preferably, a penetrating observation port is provided on the side wall of the mounting seat, and the observation port extends to the opening end of the mounting seat.

[0013] Preferably, a steel plate is provided between the mounting seat and the tensioning seat, and the steel plate is fixed to the tensioning seat by bolts.

[0014] The technical solution provided by the embodiment of the utility model has the following beneficial effects: effectively solving the problem of slowly releasing the through-steel rod when disassembling and releasing the steering gear after concrete curing is completed, thereby slowly releasing the vertical force on the steering gear and prestressed tendons in the body, and better solving the problem of rebound impact force on the surrounding concrete caused by the steering gear and prestressed tendons in the body due to rapid release, while solving the problem of difficulty in removing the anchor nut. In addition, the mounting seat is first used as a pressure-bearing device, and after the concrete curing is completed and the strength is reached, the hydraulic jack is used for pressure bearing, which can greatly reduce the force-bearing time of the jack, ensure construction reliability, and increase the service life of the jack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0016] Figure 2 This is a schematic diagram of the mounting base structure of an embodiment of the utility model.

[0017] Among them, the figure markings are: 1. mounting seat; 2. through hole; 3. through steel rod; 4. steering gear; 5. hydraulic jack; 6. resistance plate; 7. locking nut; 8. pressure plate; 9. fastening nut; 10. observation port; 11. steel plate. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0020] In the description of the invention of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention of the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention of the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of the present utility model, unless otherwise specified, "multiple" means two or more.

[0021] In the description of the invention of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of the utility model can be understood according to specific circumstances.

[0022] Example 1

[0023] See also Figures 1 to 2 The utility model provides a novel hydraulic I-beam tensioning and slow-release device, comprising a mounting seat 1 fixed on a tensioning platform, the mounting seat 1 being a cylindrical structure with one end open, a through hole 2 penetrating through the middle of the closed end of the mounting seat 1, a through steel rod 3 with an external thread on the outer wall is arranged in the through hole 2, and the two ends of the through steel rod 3 extend to both sides of the mounting seat 1;

[0024] One end of the through-core steel rod 3 close to the tensioning pedestal is detachably connected to the diverter 4 .

[0025] A hydraulic jack 5 is provided on both sides of the through-core steel rod 3, and the hydraulic jack 5 is located in the mounting seat 1. One end of the two hydraulic jacks 5 abuts against the closed end of the mounting seat 1, and the other end abuts against the abutment plate 6, and the abutment plate 6 is sleeved on the outer side of the through-core steel rod 3;

[0026] A locking nut 7 is arranged on the through-core steel rod 3 , and the locking nut 7 is located on the side of the abutment plate 6 facing away from the jack 5 .

[0027] A pressure plate 8 is provided at the open end of the mounting seat 1, and the pressure plate 8 is sleeved on the outer side of the through-core steel rod 3;

[0028] A fastening nut 9 is arranged on the through-core steel rod 3 , and the fastening nut 9 is located on the side of the pressure plate 8 facing away from the mounting seat 1 .

[0029] A penetrating observation port 10 is provided on the side wall of the mounting seat 1 , and the observation port 10 extends to the opening end of the mounting seat 1 .

[0030] A steel plate 11 is arranged between the mounting seat 1 and the tensioning seat, and the steel plate 11 is fixed to the tensioning seat by bolts.

[0031] When the utility model is used, before the prestressed tendons are tensioned, the hydraulic jack 5 is placed in advance inside the mounting seat 1, and a resisting plate 6 and a locking nut 7 are installed at the lower part to fix the position of the hydraulic jack 5.

[0032] When prestressing, the steering gear 4 is fixed by using the through steel rod 2 and the mounting seat 1 plus the pressure plate 9 and the fastening nut 10 to ensure the steering gear 4 is in a stable state during tensioning.

[0033] When the steering gear 4 is disassembled and released after the concrete curing is completed, the hydraulic jack 5 in the mounting seat 1 is first pressurized to balance the tension generated by the steering gear 4, so as to facilitate the twisting of the fastening nut 9. After the fastening nut 9 is removed, the tension of the steering gear 4 acts on the hydraulic jack 5. At this time, the hydraulic jack 5 is slowly depressurized to prevent the sudden release of pressure from affecting the concrete performance of the steering gear 4. After the pressure is released, the locking nut 7 and the hydraulic jack 5 are removed, and the through-steel rod 3 is unscrewed.

[0034] The reserved holes for bolts are backfilled and the concrete near the original reserved holes is treated again.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of hydraulic I-beam tensioning and slow-release device, characterized in that, It includes a mounting base (1) fixed on a tensioning pedestal. The mounting base (1) is a cylindrical structure with an open end. A through hole (2) is provided in the middle of the closed end of the mounting base (1). A through-core steel bar (3) with an external thread on its outer wall is arranged in the through hole (2). Both ends of the through-core steel bar (3) extend to both sides of the mounting base (1). One end of the through-core steel bar (3) close to the tensioning pedestal is detachably connected to a deflector (4).

2. The novel hydraulic I-beam tensioning and slow-release device according to claim 1 is characterized in that: A hydraulic jack (5) is arranged on each side of the through-core steel bar (3). The hydraulic jack (5) is located inside the mounting base (1). One end of the two hydraulic jacks (5) abuts against the closed end of the mounting base (1), and the other end abuts against a resisting plate (6). The resisting plate (6) is sleeved outside the through-core steel bar (3). A locking nut (7) is arranged on the through-core steel bar (3). The locking nut (7) is located on the side of the resisting plate (6) away from the jack (5).

3. The novel hydraulic I-beam tensioning and slow-release device according to claim 2 is characterized in that: A bearing plate (8) is arranged at the open end of the mounting base (1). The bearing plate (8) is sleeved outside the through-core steel bar (3). A fastening nut (9) is arranged on the through-core steel bar (3). The fastening nut (9) is located on the side of the bearing plate (8) away from the mounting base (1).

4. The novel hydraulic I-beam tensioning and slow-release device according to claim 1 is characterized in that: An observation port (10) is provided in the side wall of the mounting base (1). The observation port (10) extends to the open end of the mounting base (1).

5. The novel hydraulic I-beam tensioning and slow-release device according to claim 1 is characterized in that: A steel plate (11) is arranged between the mounting base (1) and the tensioning pedestal. The steel plate (11) is fixed on the tensioning pedestal by bolts.

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