Stress releasing device for prestressed steel strand

Abstract

The utility model relates to the technical field of steel strands, in particular to a prestress steel strand stress releasing device which comprises a steel strand, an original working anchor ring and a concrete wall, a prestress anchor seat hole is formed in one side of the concrete wall, and the original working anchor ring is arranged at the prestress anchor seat hole. A steel strand bundle composed of a plurality of steel strands is anchored on the original working anchor ring, the supporting foot is in a door shape, a through hole for the steel strand bundle to penetrate through is formed in the center of the top end of the door shape of the supporting foot, and the opening end of the supporting foot faces a pre-stressed anchor socket hole provided with the steel strand bundle. A new working anchor ring is arranged on the side, away from the hole of the pre-stressed anchor base, of the supporting foot, any steel strand in the steel strand bundle is detachably anchored to the new working anchor ring, and a stress tensioning and releasing device is connected to the side, away from the hole of the pre-stressed anchor base, of the new working anchor ring. The utility model provides the stress release device for the prestressed steel strand, which is low in stress release difficulty.

Description

Technical Field

[0001] This utility model relates to the field of steel strand technology, and in particular to a stress relief device for prestressed steel strand. Background Technology

[0002] In previous similar tank projects, when the prestressing of the walls was substandard, the stress release of the steel strands was typically achieved through scanning drilling and cutting. This construction technique has several drawbacks:

[0003] 1. Drilling and cutting require a long time. Because the concrete wall uses C50 grade concrete, the distance from the outer side to the horizontal corrugated pipe is about 35cm, the thickness is relatively large, and the concrete strength has generally reached at least 80% when tensioning conditions are met. Drilling with a drill bit is time-consuming and difficult, and consumes a lot of materials and human resources.

[0004] 2. High degree of sudden stress release. During the threading process, the steel strands are affected by gravity and pipeline constraints, and the threaded steel strands are prone to twisting in the pipeline. During the cutting process, personnel and equipment do not have fixed stress points, and other steel strands may be accidentally damaged when cutting a single steel strand. Since the stress conditions of other steel strands are not known, accidental cutting can easily lead to a sudden release of stress in the entire bundle of steel strands, which poses a significant safety hazard.

[0005] The aforementioned defects are the main reason why stress release of steel strand bundles in storage tanks has been difficult in the past. The key lies in the equipment; once the equipment issues are resolved, the defects in the stress release process can naturally be solved. Utility Model Content

[0006] The purpose of this invention is to provide a stress relief device for prestressed steel strands to solve the technical problems existing in the background art.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] A prestressed steel strand stress relief device includes: steel strands, an original working anchor ring, and a concrete wall. A prestressed anchor seat opening is provided on one side of the concrete wall, and the original working anchor ring is provided at the prestressed anchor seat opening. A steel strand bundle composed of several steel strands is anchored on the original working anchor ring. The device also includes: a support leg, which is U-shaped. A through hole for the steel strand bundle to pass through is provided at the center of the top of the U-shape of the support leg. The open end of the support leg faces the prestressed anchor seat opening containing the steel strand bundle. A suspension assembly that can adjust the position of the support leg to align it with the prestressed anchor seat opening is connected to the support leg. A new working anchor ring is provided on the side of the support leg away from the prestressed anchor seat opening. Any one of the steel strands in the steel strand bundle is detachably anchored on the new working anchor ring. A stress tension relief device is connected to the side of the new working anchor ring away from the prestressed anchor seat opening.

[0009] Furthermore, the support foot includes: a pad plate, an upright plate, and lifting lugs. There are two upright plates and four lifting lugs. The two upright plates are symmetrically and fixedly connected to the left end of the pad plate. The four lifting lugs are symmetrically and fixedly connected to the front and rear sides of the outer end face of the connection between the two upright plates and the pad plate. A through hole is provided in the middle of the pad plate.

[0010] Furthermore, the support foot also includes: a reinforcing rib, wherein there are two reinforcing ribs, which are symmetrically fixedly connected to the inner side of the connection between the two upright plates and the pad plate. The upper and lower ends of the reinforcing ribs are fixedly connected to the two upright plates respectively, and the right end of the reinforcing ribs is fixedly connected to the left end face of the pad plate.

[0011] Furthermore, the suspension assembly includes: a cantilever beam, steel wire ropes, a hand-operated hoist, and shackles. Two steel wire ropes and two shackles are provided. The cantilever beam is set on the upper part of the concrete wall. The upper end of the hand-operated hoist is detachably fixed to the cantilever beam. The lower end of the hand-operated hoist is detachably fastened to one end of two steel wire ropes. The other ends of the two steel wire ropes are respectively sleeved and fixed to the upper part of two shackles. The two shackles are detachably fastened to two lifting lugs on the upper part.

[0012] Furthermore, the new working anchor ring has through holes corresponding to several steel strands, and the steel strands are respectively inserted into the several through holes. A clamping assembly is provided on the right side of one of the through holes to fix the steel strand inserted through the through hole.

[0013] Furthermore, the clamping assembly includes: clamping plates and tightening rings. Two clamping plates are symmetrically arranged, forming a conical clamping sleeve. The diameter of the left end of the clamping sleeve is smaller than the diameter of the through hole, and the diameter of the right end of the clamping sleeve is larger than the diameter of the through hole. A wire-passing channel is provided in the middle of the clamping sleeve. Several locking teeth are evenly arranged on the inner wall of the wire-passing channel along the length of the wire-passing channel to restrict the displacement of the steel strand. An annular groove is provided on the outer right side of the clamping sleeve, and a tightening ring is detachably sleeved and fixed in the annular groove.

[0014] Furthermore, the stress tension release device includes: a portal frame, bolts, a jack, and a connecting seat. Two rectangular grooves are symmetrically opened on the upper and lower sides of the right end of the pad. The two legs of the portal frame are respectively engaged in the two rectangular grooves and fixedly connected to the pad by bolts. A through hole is opened in the middle of the right end of the portal frame. The diameter of the through hole is larger than the diameter of the telescopic end of the jack and smaller than the diameter of the fixed end of the jack. The right end of the new working anchor ring is fixedly connected to the connecting seat, and the telescopic end of the jack is threadedly connected to the connecting seat.

[0015] Furthermore, a support plate is fixedly connected to the lower right end of the portal frame, and the top of the support plate contacts the outer wall of the fixed end of the jack.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] By suspending the support legs and passing the steel strand bundle through the holes in the pad, adjusting the chain hoist length, and bringing the upright plate close to the concrete wall of the anchor hole, a new working anchor ring and jack are installed. A steel strand is fixed to the new working anchor ring through the clamp assembly. Pressure is then applied to the jack. During the pressure application process, the loosening of the clamp on the original working anchor ring is observed through the observation channel of the support legs. When the clamp loosens and half of it extends out of the original working anchor ring, the pressure is stopped, and the clamp is removed using the steel strand hook. Finally, the pressure is released, and the steel strand is placed back into the hole, completing the stress release of the steel strand. The entire device requires no drilling or cutting, is simple and convenient to operate, and has low difficulty in releasing the stress of the steel strand bundle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is the left view of this utility model.

[0021] The labels in the attached diagram are as follows: 1-base plate, 2-vertical plate, 3-reinforcing rib, 4-lifting lug, 5-gantry bracket, 6-bolt, 7-jack, 8-support plate, 9-connecting seat, 10-new working anchor ring, 11-clamping plate, 12-steel strand, 13-original working anchor ring, 14-concrete wall. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] See Figures 1-3 As shown, a prestressed steel strand stress relief device includes: steel strands 12, an original working anchor ring 13, and a concrete wall 14. A prestressed anchor seat opening is provided on one side of the concrete wall 14, and the original working anchor ring 13 is provided at the prestressed anchor seat opening. A steel strand bundle composed of several steel strands 12 is anchored on the original working anchor ring 13. The device also includes: a support foot, which is U-shaped. A through hole for the steel strand bundle to pass through is provided at the center of the top of the U-shape of the support foot. The open end of the support foot faces the prestressed anchor seat opening containing the steel strand bundle. A suspension component that can adjust the position of the support foot to align it with the prestressed anchor seat opening is connected to the support foot. A new working anchor ring 10 is provided on the side of the support foot away from the prestressed anchor seat opening. Any one of the steel strands in the steel strand bundle is detachably anchored on the new working anchor ring 10. A stress tension relief device is connected to the side of the new working anchor ring 10 away from the prestressed anchor seat opening.

[0024] In this embodiment, the support foot includes: a pad plate 1, a vertical plate 2, and lifting lugs 4. There are two vertical plates 2 and four lifting lugs 4. The two vertical plates 2 are symmetrically and fixedly connected to the left end of the pad plate 1. The four lifting lugs 4 are symmetrically and fixedly connected to the front and rear sides of the outer end face of the connection between the two vertical plates 2 and the pad plate 1. A through hole is provided in the middle of the pad plate 1.

[0025] The support leg also includes: reinforcing ribs 3. There are two reinforcing ribs 3. The two reinforcing ribs 3 are symmetrically fixedly connected to the inner side of the connection between the two upright plates 2 and the pad plate 1. The upper and lower ends of the reinforcing ribs 3 are fixedly connected to the two upright plates 2 respectively. The right end of the reinforcing ribs 3 is fixedly connected to the left end face of the pad plate 1. The reinforcing ribs 3 can improve the connection strength between the upright plates 2 and the pad plate 1 and the support stability.

[0026] During the fabrication of the support legs, firstly, each component is processed according to the dimensions specified in the drawings. All components undergo stress calculations and market price assessments. Ultimately, 60mm thick Q345 steel is selected for the main load-bearing uprights and base plates, while 50mm thick Q345 steel is selected for the lifting lugs and reinforcing ribs. The components are connected using manual arc welding. Before welding, the weld cross-section is ground to remove the oxide layer adhering to the surface of the steel. Secondly, the components are preheated before welding, with the preheating temperature controlled at 100-150℃ and held at that temperature for 30 minutes before welding begins. During preheating, the thermocouple measuring point is 15mm-20mm away from the edge of the bevel. Due to the high cold cracking tendency of Q345 steel, low-hydrogen welding materials are selected. Considering the principle that the weld joint should have equal strength to the base metal, E5015 (J507) type welding rods are used. Furthermore, to avoid coarse weld structure and reduced impact toughness, Φ3.2mm welding rods are selected. Welding between components requires the use of double-sided full welding technology, and the welding current should be controlled between 100-130A. The weld height between components should be between 10-15mm.

[0027] In this embodiment, the suspension assembly includes: a cantilever beam, steel wire ropes, a hand-operated hoist, and shackles. Two steel wire ropes and two shackles are provided. The cantilever beam is set on the upper part of the concrete wall 14. The upper end of the hand-operated hoist is detachably fixed to the cantilever beam. The lower end of the hand-operated hoist is detachably fastened to one end of two steel wire ropes. The other ends of the two steel wire ropes are respectively sleeved and fixed to the upper part of two shackles. The two shackles are detachably fastened to two lifting lugs 4 on the upper part.

[0028] In this embodiment, the new working anchor ring 10 has through holes corresponding to several steel strands 12. The steel strands are respectively inserted into the several through holes. A clamping assembly is provided on the right side of one of the through holes to fix the steel strand inserted through the through hole. The clamping assembly includes a clamping plate 11 and a tightening ring. Two clamping plates 11 are symmetrically arranged, and the two clamping plates 11 form a conical sleeve. The diameter of the left end of the sleeve is smaller than the diameter of the through hole, and the diameter of the right end of the sleeve is larger than the diameter of the through hole. A wire-passing channel is provided in the middle of the sleeve. Several locking teeth are evenly arranged on the inner wall of the wire-passing channel along the length of the wire-passing channel to restrict the displacement of the steel strands 12. An annular groove is provided on the outer wall of the right side of the sleeve, and a tightening ring is detachably sleeved and fixed in the annular groove.

[0029] In this embodiment, the stress tension release device includes: a portal frame 5, bolts 6, a jack 7, and a connecting seat 9. Two rectangular grooves are symmetrically opened on the upper and lower sides of the right end of the pad 1. The two legs of the portal frame 5 are respectively engaged in the two rectangular grooves and fixedly connected to the pad 1 by bolts 6. A through hole is opened in the middle of the right end of the portal frame 5. The diameter of the through hole is larger than the diameter of the telescopic end of the jack 7 and smaller than the diameter of the fixed end of the jack 7. The right end of the new working anchor ring 10 is fixedly connected to the connecting seat 9, and the telescopic end of the jack 7 is threadedly connected to the connecting seat 9.

[0030] In this embodiment, a support plate 8 is fixedly connected to the lower right end of the portal frame 5. The top of the support plate 8 contacts the outer wall of the fixed end of the jack 7. The support plate 8 can prevent the jack 7 from being suspended.

[0031] When using this device

[0032] Step 1: Connect the cantilever beam, wire rope, and hand chain hoist to the support leg. Pass the steel strand bundle through the center of the support leg and insert it into the prestressed anchor hole. Adjust the chain length of the hand chain hoist to press the upright plate against the concrete wall of the anchor hole.

[0033] Step 2: Install the new working anchor ring and jack respectively, and before fixing the jack, apply slight pressure with the tensioning oil pump to make the jack piston extend 3-5 cm;

[0034] Step 3: Fix a steel strand to the new working anchor ring using the clamp assembly, then apply pressure to the jack. During the pressure application process, observe the loosening of the clamps on the original working anchor ring through the observation channel of the support foot. When the clamps loosen and half of them extend out of the original working anchor ring, stop applying pressure, use the steel strand hook to remove the clamps, and finally release the pressure and put the steel strand back into the hole to complete the stress release of the steel strand.

[0035] Repeat steps two and three until all the stress in the steel strand bundle inside the pipe is released.

[0036] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom", 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.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the present utility model's technical solution and based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model's technical solution.

Claims

1. A stress relief device for prestressed steel strand, comprising: The structure comprises steel strands (12), an original working anchor ring (13), and a concrete wall (14). A prestressed anchor hole is provided on one side of the concrete wall (14). An original working anchor ring (13) is provided at the prestressed anchor hole. A steel strand bundle composed of several steel strands (12) is anchored on the original working anchor ring (13). The structure is characterized by further comprising: a support foot, which is U-shaped. A through hole for the steel strand bundle to pass through is provided at the center of the top of the U-shaped support foot. The open end of the support foot faces the prestressed anchor hole containing the steel strand bundle. A suspension assembly that can adjust its position to align with the prestressed anchor hole is connected to the support foot. A new working anchor ring (10) is provided on the side of the support foot away from the prestressed anchor hole. Any one of the steel strands in the steel strand bundle is detachably anchored on the new working anchor ring (10). A stress tensioning release device is connected to the side of the new working anchor ring (10) away from the prestressed anchor hole.

2. The prestressed steel strand stress relief device according to claim 1, characterized in that: The support foot includes: a pad (1), a vertical plate (2), and a lifting lug (4). There are two vertical plates (2) and four lifting lugs (4). The two vertical plates (2) are symmetrically and vertically fixedly connected to the left end of the pad (1). The four lifting lugs (4) are symmetrically and fixedly connected to the front and rear sides of the outer end face of the connection between the two vertical plates (2) and the pad (1). A through hole is provided in the middle of the pad (1).

3. The prestressed steel strand stress relief device according to claim 2, characterized in that: The support foot also includes: a reinforcing rib (3), there are two reinforcing ribs (3), the two reinforcing ribs (3) are symmetrically fixedly connected to the inner side of the connection between the two upright plates (2) and the pad plate (1), the upper and lower ends of the reinforcing rib (3) are fixedly connected to the two upright plates (2) respectively, and the right end of the reinforcing rib (3) is fixedly connected to the left end face of the pad plate (1).

4. The prestressed steel strand stress relief device according to claim 2, characterized in that: The suspension assembly includes: a cantilever beam, steel wire rope, a hand-operated hoist and shackles. Two steel wire ropes and two shackles are provided. The cantilever beam is set on the upper part of the concrete wall (14). The upper end of the hand-operated hoist is detachably fixed to the cantilever beam. The lower end of the hand-operated hoist is detachably fastened to one end of two steel wire ropes. The other ends of the two steel wire ropes are respectively sleeved and fixed to the upper part of two shackles. The two shackles are detachably fastened to two lifting lugs (4) on the upper part.

5. The prestressed steel strand stress relief device according to claim 1, characterized in that: The new working anchor ring (10) has through holes corresponding to several steel strands (12) one by one. Several steel strands are respectively inserted into several through holes. A clamping assembly is provided on the right side of one of the through holes to fix the steel strand inserted into the through hole.

6. The prestressed steel strand stress relief device according to claim 5, characterized in that: The clamping assembly includes: clamping pieces (11) and tightening rings. Two clamping pieces (11) are symmetrically arranged, and the two clamping pieces (11) form a conical clamping sleeve. The diameter of the left end of the clamping sleeve is smaller than the diameter of the through hole, and the diameter of the right end of the clamping sleeve is larger than the diameter of the through hole. A wire-passing channel is provided in the middle of the clamping sleeve. Several locking teeth are evenly arranged on the inner wall of the wire-passing channel along the length of the wire-passing channel. The locking teeth restrict the displacement of the steel strand (12). An annular groove is provided on the outer right side of the clamping sleeve. A tightening ring is detachably sleeved and fixed in the annular groove.

7. A prestressed steel strand stress relief device according to claim 2, characterized in that: The stress tension release device includes: a portal frame (5), bolts (6), a jack (7) and a connecting seat (9). Two rectangular grooves are symmetrically opened on the upper and lower sides of the right end of the pad (1). The two legs of the portal frame (5) are respectively engaged in the two rectangular grooves and fixedly connected to the pad (1) by bolts (6). A through hole is opened in the middle of the right end of the portal frame (5). The diameter of the through hole is larger than the diameter of the telescopic end of the jack (7) and smaller than the diameter of the fixed end of the jack (7). The right end of the new working anchor ring (10) is fixedly connected to the connecting seat (9). The telescopic end of the jack (7) is threadedly connected to the connecting seat (9).

8. A prestressed steel strand stress relief device according to claim 7, characterized in that: The lower right end of the portal frame (5) is fixedly connected to a support plate (8), and the top of the support plate (8) is in contact with the outer wall of the fixed end of the jack (7).

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