Prestressed anchor cable equal-force tensioning device suitable for different numbers of steel strands

Abstract

The utility model provides an equal-force tensioning device for a pre-stressed anchor cable, which is suitable for different numbers of steel strands and aims to solve the problems of non-uniform tensioning of the steel strands and loss of pre-stress when the pre-stressed anchor cable is used for supporting in slope engineering. The device is designed into a structure device with a base, a hydraulic cylinder inner sleeve, a hydraulic cylinder outer sleeve, a cover plate, a sealing plate, a spring, a gasket, a clamping piece and a hydraulic pump which are integrated, split type hydraulic cylinders are adopted, each steel strand is tensioned independently, the tension of all the steel strands is equal, meanwhile, the sealing plate is used for locking the redundant hydraulic cylinders according to the number of the anchor cable steel strands, and the anchor cable steel strands are tensioned independently. The applicability of the device is improved, the spring and the gasket are adopted to enable the clamping piece on the anchorage device to be kept at the correct position so that the steel strand can be locked in time after the steel strand is tensioned, and therefore prestress loss is avoided, and the reliability of pre-stressed anchor cable supporting is improved.

Description

Technical Field

[0001] The utility model belongs to the field of geotechnical engineering, and specifically relates to a prestressed anchor cable isoforce tensioning device suitable for different numbers of steel strands. The prestressed anchor cable isoforce tensioning device is especially suitable for anchor cable tensioning when reinforcing slopes. Background Art

[0002] Prestressed anchor cable is a construction technology that buries steel strands inside rock formations for prestressing. One end of the cable is anchored in a stable rock and soil mass by a high-strength steel strand, and the other end is fixed in the reinforced rock and soil mass or potential landslide mass. It is an active support method that transfers the support stress of the main structure to deep stable rock formations.

[0003] In the currently widely used prestressed anchor cable construction technology, the tensioning process of the steel strand adopts the equal displacement tensioning method, that is, multiple bundles of steel strands are fixed on the anchor through clips and tensioned as a whole. During the tensioning process, the tensioning displacements of different steel strands are the same. This anchor cable tensioning method usually causes uneven tension of the steel strands, some steel strands exceed the designed prestress value, and some steel strands do not reach the designed prestress value, resulting in material waste. At the same time, the currently used anchor cable tensioning device cannot lock the steel strand in time after the steel strand tensioning is completed, resulting in prestress loss. Utility Model Content

[0004] The purpose of the utility model is to provide a prestressed anchor cable equal-force tensioning device suitable for different numbers of steel strands, which adopts a split hydraulic oil chamber, that is, a hydraulic cylinder is separately designed for the tensioning process of each steel strand, so that the tension of all steel strands is equal and the prestressing of the anchor cable is more accurate. Not only, the reliability of the prestressed anchor cable support is effectively improved, and the problems of uneven tension of the steel strands and prestress loss during the anchor cable tensioning process are avoided, but also it has the characteristics of strong applicability and construction standards.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A prestressed anchor cable isostatic tensioning device suitable for different numbers of steel strands, comprising a base, a hydraulic cylinder outer sleeve, a cover plate connected in sequence from back to front, and at least one hydraulic cylinder inner sleeve inserted into the base, the hydraulic cylinder outer sleeve, and the cover plate in sequence; the at least one hydraulic cylinder inner sleeve is used to pass at least one steel strand, and the front end of the steel strand is fixed to the corresponding hydraulic cylinder inner sleeve, and the rear end extends to the outside of the base and is fixed to the anchor behind the base; front and rear hydraulic oil chambers are formed between each hydraulic cylinder inner sleeve of the at least one hydraulic cylinder inner sleeve and the hydraulic cylinder outer sleeve; each rear hydraulic oil chamber is connected at the base, and the base is provided with a base hydraulic oil inlet and outlet to transport hydraulic oil to each rear hydraulic oil chamber, thereby driving each hydraulic cylinder inner sleeve to move forward so that the steel strands inserted in the hydraulic cylinder inner sleeve are isostatically tensioned; each front hydraulic oil chamber is connected at the cover plate, and the cover plate is provided with a cover plate hydraulic oil inlet and outlet to transport hydraulic oil to each front hydraulic oil chamber, thereby driving each hydraulic cylinder inner sleeve to move backward and reset.

[0007] Optionally, the hydraulic cylinder outer sleeve has at least one outer sleeve chamber for respectively passing through each hydraulic cylinder inner sleeve.

[0008] Optionally, the outer wall of each hydraulic cylinder inner sleeve is respectively provided with a flange arranged around its periphery; the flange is sealingly connected to the inner wall of the corresponding outer sleeve chamber, and is suitable for separating the corresponding outer sleeve chamber into independent front hydraulic oil chamber and rear hydraulic oil chamber.

[0009] Optionally, the cover plate has at least one cover plate chamber; the at least one cover plate chamber is suitable for being communicated with each outer sleeve chamber respectively so as to penetrate the front end of each hydraulic cylinder inner sleeve respectively.

[0010] Optionally, a sealing plate is also included; for a cover plate chamber without a steel strand passing through it, the front end of the cover plate chamber is closed by the sealing plate.

[0011] Optionally, the base has at least one base chamber; the at least one base chamber is suitable for being communicated with each outer sleeve chamber respectively so as to pass through the rear end of each hydraulic cylinder inner sleeve respectively.

[0012] Optionally, the cover plate has a cover plate hydraulic oil connecting channel which is connected to the cover plate hydraulic oil inlet and outlet and each front hydraulic oil chamber respectively, so as to transport the hydraulic oil from the cover plate hydraulic oil inlet and outlet to each front hydraulic oil chamber.

[0013] Optionally, the base has a base hydraulic oil communication channel which is respectively connected to the base hydraulic oil inlet and outlet and each rear hydraulic oil chamber, so as to transport the hydraulic oil from the base hydraulic oil inlet and outlet to each rear hydraulic oil chamber.

[0014] Optionally, the anchor has at least one anchor through-hole, in which an anchor clip is respectively arranged; the base also has at least one limit groove; each of the at least one limit groove is provided with a washer and a spring in sequence from back to front; the rear end of the steel strand is suitable for passing through the spring and the washer in sequence and then being fixed to the anchor clip; the washer is suitable for abutting against the anchor clip when the steel strand is tensioned to prevent the anchor clip from loosening and compressing the spring at the same time; the spring is suitable for restoring the compression when the steel strand is released from tension to reset the washer.

[0015] Optionally, each hydraulic cylinder inner sleeve is provided with a hydraulic cylinder inner sleeve clamp to fix the front end of the steel strand.

[0016] Compared with the prior art, the technical solution of the utility model has at least the following beneficial effects:

[0017] For example, the prestressed anchor cable equal-force tensioning device provided by the utility model, which is suitable for different numbers of steel strands, adopts a split hydraulic oil chamber, that is, a hydraulic cylinder is designed separately for the tensioning process of each steel strand, so that the tension of all steel strands is equal and the prestressing of the anchor cable is more accurate. This not only effectively improves the reliability of prestressed anchor cable support, avoids problems such as uneven tension of the steel strands and prestress loss during the anchor cable tensioning process, but also has the characteristics of strong applicability and construction standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a prestressed anchor cable isotropic tensioning device applicable to different numbers of steel strands provided in an embodiment of the utility model;

[0019] Figure 2 A partially exploded schematic diagram of a prestressed anchor cable isotropic tensioning device applicable to different numbers of steel strands provided by an embodiment of the utility model;

[0020] Figure 3 A longitudinal cross-sectional view of a prestressed anchor cable isotropic tensioning device applicable to different numbers of steel strands provided in an embodiment of the utility model;

[0021] Figure 4 A transverse cross-sectional view of a prestressed anchor cable isotropic tensioning device suitable for different numbers of steel strands provided by an embodiment of the utility model along the contact surface between the cover plate and the hydraulic cylinder jacket;

[0022] Figure 5 A schematic diagram of a prestressed anchor cable isoforce tensioning device at the front end of a cover plate provided in an embodiment of the utility model and suitable for different numbers of steel strands.

[0023] Reference numerals:

[0024] 1 Hydraulic cylinder inner sleeve; 1-1 inner sleeve chamber; 3-1 front hydraulic oil chamber; 3-2 rear hydraulic oil chamber; 4-1 hydraulic cylinder inner sleeve clip; 4-2 anchor clip; 5 cover plate; 5-1 cover plate chamber; 5-2 cover plate hydraulic oil inlet and outlet; 5-3 cover plate hydraulic oil connecting channel; 6 hydraulic cylinder outer sleeve; 6-1 outer sleeve chamber; 7 base; 7-1 base chamber; 7-2 base hydraulic oil inlet and outlet; 7-3 base hydraulic oil connecting channel; 7-4 limit groove; 8 spring; 9 washer; 10 anchor; 11 steel strand; 13 bolt; 14-sealing plate; 15 pressure plate; 16 hydraulic pump. DETAILED DESCRIPTION

[0025] In order to make the purpose, features and beneficial effects of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below with reference to the accompanying drawings. It is understood that the specific implementation described below is only used to explain the utility model, rather than to limit the utility model.

[0026] In addition, for the convenience of description, only the parts related to the present invention are shown in the drawings instead of all structures. In addition, the same or similar reference numerals may be used in the drawings to refer to the same or similar parts in different embodiments.

[0027] Reference Figures 1 to 5 The embodiment of the utility model provides a prestressed anchor cable isoforce tensioning device suitable for different numbers of steel strands 11.

[0028] Specifically, the prestressed anchor cable isotropic tensioning device comprises a base 7, a cover plate 5, a hydraulic cylinder outer sleeve 6 and a hydraulic cylinder inner sleeve 1.

[0029] In some embodiments, the rear end of the base 7 is suitable for directly contacting the anchor 10; and the base 7, the hydraulic cylinder housing 6 and the cover plate 5 are connected in sequence from back to front.

[0030] It can be understood that the front and rear directions described in the embodiments of the present invention are merely examples given to facilitate the description and understanding of the technical solution, rather than limiting the direction of the prestressed anchor cable isotropic tensioning device and its components.

[0031] In some embodiments, the anchor 10 may be mounted on a pressure plate 15 .

[0032] In some embodiments, the cover plate 5 and the base 7 are respectively located at the front and rear sides of the hydraulic cylinder housing 6 and are connected by bolts 13 .

[0033] In a further embodiment, the cover plate 5 and the base 7 may be connected by a plurality of, for example, four, bolts 13 , and the plurality of, for example, four, bolts 13 are evenly arranged at corners, for example, four corners, of the cover plate 5 and the base 7 .

[0034] In a specific implementation, at least one hydraulic cylinder inner sleeve 1 is provided, and at least one hydraulic cylinder inner sleeve 1 is respectively passed through the base 7, the hydraulic cylinder outer sleeve 6 and the cover plate 5 in sequence.

[0035] In some embodiments, the hydraulic cylinder jacket 6 has at least one jacket chamber 6 - 1 for respectively passing through each hydraulic cylinder inner jacket 1 .

[0036] In some embodiments, the cover plate 5 also has at least one cover plate chamber 5-1; at least one cover plate chamber 5-1 is connected front to back, and is suitable for communicating with each outer sleeve chamber 6-1 to pass through the front end of each hydraulic cylinder inner sleeve 1.

[0037] In some embodiments, the base 7 further has at least one base chamber 7-1; the at least one base chamber 7-1 is suitable for being connected to each outer sleeve chamber 6-1 respectively, so as to penetrate the rear end of each hydraulic cylinder inner sleeve 1 respectively.

[0038] In some embodiments, the front ends of the hydraulic cylinder inner sleeves 1 extend to the outside of the cover plate 5 , and the rear ends thereof extend to the inside of the hydraulic cylinder outer sleeves 6 .

[0039] In a specific implementation, each hydraulic cylinder inner sleeve 1 has an inner sleeve chamber 1-1 that is connected from front to back and is used to pass the steel strand 11. Moreover, one hydraulic cylinder inner sleeve 1 is suitable for passing one steel strand 11.

[0040] In some embodiments, at least one of the at least one hydraulic cylinder inner sleeve 1 is penetrated by a steel strand 11 during use.

[0041] In a further embodiment, at least two of the at least one hydraulic cylinder inner sleeve 1 are provided with steel strands 11 during use.

[0042] As an example but not limitation, the number of at least one hydraulic cylinder inner sleeve 1 can include seven. Moreover, the seven hydraulic cylinder inner sleeves 1 can be used for threading one, two, three, four, five, six, or seven different numbers of steel strands 11 during use. Therefore, the prestressed anchor cable isotropic tensioning device can be suitable for tensioning one, two, three, four, five, six, or seven different numbers of steel strands 11.

[0043] In some embodiments, the front end of the steel strand 11 passing through the hydraulic cylinder inner sleeve 1 is fixed to the corresponding hydraulic cylinder inner sleeve 1 , and the rear end extends to the outside of the base 7 and is fixed to the anchor 10 behind the base 7 .

[0044] In some embodiments, a hydraulic cylinder inner sleeve clip 4 - 1 is also provided in the front end of each hydraulic cylinder inner sleeve 1 for fixing the front end of the steel strand 11 .

[0045] In some embodiments, the front end of the steel strand 11 passing through the hydraulic cylinder inner sleeve 1 is also suitable for extending outside the front end of the hydraulic cylinder inner sleeve 1 .

[0046] In some embodiments, the anchor 10 has at least one anchor through-hole, and an anchor clip 4 - 2 is respectively disposed in the at least one anchor through-hole for fixing the rear end of the steel strand 11 .

[0047] It can be understood that in the embodiment of the utility model, the rear end of the steel strand 11 is merely a description made for the understanding and description of the technical solution. The description is intended to illustrate the part of the steel strand 11 extending to the rear of the base 6, rather than referring to the rear end of the actual length of the steel strand 11.

[0048] In a specific implementation, two front and rear hydraulic oil chambers 3-1 and 3-2, namely a front hydraulic oil chamber 3-1 and a rear hydraulic oil chamber 3-2, can be formed between each hydraulic cylinder inner sleeve 1 and the hydraulic cylinder outer sleeve 6.

[0049] Specifically, at least one hydraulic cylinder inner sleeve 1 and at least one outer sleeve chamber 6-1 of the hydraulic cylinder outer sleeve 6 correspond to each other one by one, and a corresponding group of hydraulic cylinder inner sleeves 1 and outer sleeve chambers 6-1 are suitable for forming a front hydraulic oil chamber 3-1 and a rear hydraulic oil chamber 3-2. At least one hydraulic cylinder inner sleeve 1 and at least one outer sleeve chamber 6-1 together form at least one front hydraulic oil chamber 3-1 and at least one rear hydraulic oil chamber 3-2.

[0050] For example, in the case of seven hydraulic cylinder inner sleeves 1, the seven hydraulic cylinder inner sleeves 1 and the seven outer sleeve chambers 6-1 form seven front hydraulic oil chambers 3-1 and seven rear hydraulic oil chambers 3-2.

[0051] In some embodiments, the outer wall of each hydraulic cylinder inner sleeve 1 is respectively provided with a flange 1-1 arranged around its outer circumference. The flange 1-1 can be sealed and connected with the inner wall of the corresponding outer sleeve chamber 6-1, and is suitable for separating the front hydraulic oil chamber 3-1 and the rear hydraulic oil chamber 3-2 which are independent of each other in the corresponding outer sleeve chamber 6-1. Among them, the front hydraulic oil chamber 3-1 is located in front of the flange 1-1, and the rear hydraulic oil chamber 3-2 is located behind the flange 1-1.

[0052] In some embodiments, a sealing ring may be further provided between the flange 1 - 1 and the inner wall of the corresponding jacket chamber 6 - 1 to achieve a sealed connection.

[0053] In a specific implementation, the rear end face of the cover plate 5, the front section of the outer wall of the hydraulic cylinder inner sleeve 1, the front section of the inner wall of the hydraulic cylinder outer sleeve 6, and the left side of the flange 1-1 are suitable for jointly defining the boundary of the front hydraulic oil chamber 3-1. The front end face of the base 7, the rear section of the outer wall of the hydraulic cylinder inner sleeve 1, the rear section of the inner wall of the hydraulic cylinder outer sleeve 6, and the right side of the flange 1-1 are suitable for jointly defining the boundary of the rear hydraulic oil chamber 3-2.

[0054] In some embodiments, each hydraulic cylinder inner sleeve 1 is sealedly connected to the inner wall of the corresponding cover plate chamber 5-1 and the inner wall of the corresponding base chamber 7-1 to ensure the sealing of the corresponding front hydraulic oil chamber 3-1 and the rear hydraulic oil chamber 3-2.

[0055] In some embodiments, a sealing ring is provided between the hydraulic cylinder inner sleeve 1 and the inner wall of the corresponding cover plate chamber 5 - 1 to achieve a sealed connection between the hydraulic cylinder inner sleeve 1 and the inner wall of the corresponding cover plate chamber 5 - 1 .

[0056] In some embodiments, a sealing ring is also provided between the hydraulic cylinder inner sleeve 1 and the inner wall of the corresponding base chamber 7 - 1 to achieve a sealed connection between the hydraulic cylinder inner sleeve 1 and the inner wall of the corresponding base chamber 7 - 1 .

[0057] In some embodiments, the steel strand 11 is also suitable for being tightly inserted into the hydraulic cylinder inner sleeve 1 .

[0058] In some embodiments, the prestressed anchor cable isotropic tensioning device further comprises a sealing plate 14. For the hydraulic cylinder inner sleeve 1 without the steel strand 11, the front end of the hydraulic cylinder inner sleeve 1 is closed by the sealing plate 14 to lock the hydraulic cylinder inner sleeve 1, thereby ensuring the sealing of the front hydraulic oil chamber 3-1.

[0059] In some embodiments, the prestressed anchor cable isotropic tensioning device further includes a sealing plate 14. For the hydraulic cylinder inner sleeve 1 without the steel strand 11, the front end of the hydraulic cylinder inner sleeve 1 is sealed by the sealing plate 14 to lock the hydraulic cylinder inner sleeve 1. Specifically, the sealing plate 14 can be rotated 90° to complete the locking. In this way, redundant hydraulic cylinders can be locked for different numbers of steel strands, thereby improving the applicability under different numbers of steel strands.

[0060] In some embodiments, each rear hydraulic oil chamber 3-2 is connected at the base 7. In addition, the base 7 is provided with a base hydraulic oil inlet and outlet 7-2 for delivering hydraulic oil to each rear hydraulic oil chamber 3-2, thereby driving each hydraulic cylinder inner sleeve 1 to move forward so that the steel strand 11 passing through the hydraulic cylinder inner sleeve 1 is tensioned to the designed prestress value.

[0061] In specific implementation, when the anchor cable is tensioned, the steel strand 11 can be passed through the anchor plate and fixed to the anchor 10 with the anchor clip 4-2, and then the steel strand 11 can be passed through the inner sleeve chamber 1-1 of the hydraulic cylinder inner sleeve 1 and fixed to the front end of the hydraulic cylinder inner sleeve 1 with the hydraulic cylinder inner sleeve clip 4-1, and then the hydraulic pump 16 is used to fill oil into each rear hydraulic oil chamber 3-2, so that each hydraulic cylinder inner sleeve 1 moves forward under the action of oil pressure, thereby tensioning the corresponding steel strand 11.

[0062] In some embodiments, the base 7 also has a base hydraulic oil connecting channel 7-3 which is respectively connected to the base hydraulic oil inlet and outlet 7-2 and each rear hydraulic oil chamber 3-2, so as to transport the hydraulic oil from the base hydraulic oil inlet and outlet 7-2 to each rear hydraulic oil chamber 3-2 or to allow the hydraulic oil in each rear hydraulic oil chamber 3-2 to flow out through the base hydraulic oil inlet and outlet 7-2.

[0063] In some embodiments, each front hydraulic oil chamber 3-1 is connected at the cover plate 5. In addition, the cover plate 5 is provided with a cover plate hydraulic oil inlet and outlet 5-2 for delivering hydraulic oil to each front hydraulic oil chamber 3-1, thereby driving each hydraulic cylinder inner sleeve 1 to move backward and reset each hydraulic cylinder inner sleeve 1.

[0064] In specific implementation, when the steel strand 11 is tensioned to the designed prestress value, oil is filled into each front hydraulic oil chamber 3-1 through the hydraulic pump 16, so that each hydraulic cylinder inner sleeve 1 moves backward and resets, and then the hydraulic cylinder inner sleeve clip 4-1 on the hydraulic cylinder inner sleeve 1 is removed and the entire device is removed, and the anchor cable tensioning is completed.

[0065] In some embodiments, the cover plate 5 also has a cover plate hydraulic oil connecting channel 5-3 which is respectively connected to the cover plate hydraulic oil inlet and outlet 5-2 and each front hydraulic oil chamber 3-1, so as to transport the hydraulic oil from the cover plate hydraulic oil inlet and outlet 5-2 to each front hydraulic oil chamber 3-1 or to allow the hydraulic oil in each front hydraulic oil chamber 3-1 to flow out through the cover plate hydraulic oil inlet and outlet 5-2.

[0066] In some embodiments, the prestressed anchor cable isotropic tensioning device further comprises a hydraulic pump 16 connected to the base hydraulic oil inlet and outlet 7-2 and the cover plate hydraulic oil inlet and outlet 5-2 respectively to pump hydraulic oil to the base hydraulic oil inlet and outlet 7-2 or the cover plate hydraulic oil inlet and outlet 5-2.

[0067] In a specific implementation, when the steel strand 11 is tensioned, the anchor clip 4 - 2 on the anchor 10 may become loose.

[0068] In some embodiments, the base 7 may further include at least one limiting groove 7-4 corresponding to each base chamber 7-1, and each limiting groove 7-4 is located behind the corresponding base chamber 7-1.

[0069] In some embodiments, each limiting groove 7 - 4 is provided with a washer 9 and a spring 8 in sequence from back to front.

[0070] In a specific implementation, the rear end of the steel strand 11 is adapted to be fixed to the anchor clip 4-2 after passing through the spring 8 and the washer 9 in sequence. The washer 9 is adapted to abut against the anchor clip 4-2 when the steel strand 11 is tensioned to prevent the anchor clip 4-2 from loosening, and compress the spring 8 at the same time; and the spring 8 is adapted to restore the compression when the steel strand 11 is released from tension, so as to reset the washer 9.

[0071] In this way, it can be ensured that the anchor clip 4-2 on the anchor 10 is in the correct position, and the steel strand 11 can be locked in time after the steel strand 11 is tensioned to reach the designed prestress value, thereby avoiding prestress loss.

[0072] In a specific implementation, when the strength of the anchor cable grouting slurry reaches the requirement, the prestressed anchor cable equal force tensioning device suitable for different numbers of steel strands provided in the embodiment of the utility model is used to carry out anchor cable tensioning construction.

[0073] Before construction, the prestressed anchor cable isoforce tensioning device is first installed on an anchor cable that needs tensioning construction.

[0074] In some embodiments, the anchor cable tensioning construction can be achieved by the following steps:

[0075] S1: First pass the steel strand 11 through the anchor 10, and make the distance between the anchor 10 and the waist beam as small as possible, and then fix the steel strand 11 on the anchor 10 with the anchor clip 4-2.

[0076] S2: First, pass the steel strand 11 through the inner sleeve chamber 1-1 of the hydraulic cylinder inner sleeve 1, and make the gap between the anchor 10 and the base 7 as small as possible, and then use the hydraulic cylinder inner sleeve clip 4-1 to fix the steel strand 11 to the front end of the hydraulic cylinder inner sleeve 1.

[0077] S3: Use the sealing plate 14 to lock the redundant hydraulic cylinder inner sleeves 1 according to the number of anchor cable steel strands 11.

[0078] S4: Fill the base hydraulic oil inlet and outlet 7-2 with oil through the hydraulic pump 16, so that the inner sleeve 1 of the hydraulic cylinder moves forward under the action of oil pressure, thereby tensioning the steel strand 11.

[0079] S5: When the steel strand 11 is tensioned to reach the designed prestress value, oil is filled into the cover plate hydraulic oil inlet and outlet 5-2 through the hydraulic pump 16, so that the hydraulic cylinder inner sleeve 1 moves backward to the position before tensioning under the action of oil pressure.

[0080] S6: Remove the hydraulic cylinder inner sleeve clip 4-1 on the hydraulic cylinder inner sleeve 1, remove the prestressed anchor cable isoforce tensioning device, and the tensioning process of a single anchor cable is completed.

[0081] S7: Install the prestressed anchor cable isoforce tensioning device on the next anchor cable that needs tensioning construction, and repeat the above steps S1 to S6 to perform tensioning construction; until all anchor cables are exhausted.

[0082] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even when only a single embodiment is described with respect to specific features. The feature examples provided in the present disclosure are intended to be illustrative rather than limiting, unless otherwise stated. In specific implementations, the technical features of one or more dependent claims may be combined with the technical features of the independent claim, based on actual needs and where technically feasible, and the technical features from the corresponding independent claims may be combined in any appropriate manner rather than just by the specific combinations listed in the claims.

Claims

1. A prestressed anchor cable isotropic tensioning device suitable for different numbers of steel strands (11), characterized in that: The invention comprises a base (7), a hydraulic cylinder outer sleeve (6), a cover plate (5) connected in sequence from back to front, and at least one hydraulic cylinder inner sleeve (1) inserted into the base (7), the hydraulic cylinder outer sleeve (6), and the cover plate (5) in sequence; the at least one hydraulic cylinder inner sleeve (1) is used to pass at least one steel strand (11), and the front end of the steel strand (11) is fixed to the corresponding hydraulic cylinder inner sleeve (1), and the rear end extends to the outside of the base (7) and is fixed to an anchor (10) behind the base (7); each hydraulic cylinder inner sleeve (1) in the at least one hydraulic cylinder inner sleeve (1) and the hydraulic cylinder outer sleeve (6) form two front and rear hydraulic oil chambers. chambers (3-1, 3-2); each rear hydraulic oil chamber (3-2) is connected at the base (7), and the base (7) is provided with a base hydraulic oil inlet and outlet (7-2) for conveying hydraulic oil to each rear hydraulic oil chamber (3-2), thereby driving each hydraulic cylinder inner sleeve (1) to move forward so that the steel strand (11) passing through the hydraulic cylinder inner sleeve (1) is tensioned with equal force; each front hydraulic oil chamber (3-1) is connected at the cover plate (5), and the cover plate (5) is provided with a cover plate hydraulic oil inlet and outlet (5-2) for conveying hydraulic oil to each front hydraulic oil chamber (3-1), thereby driving each hydraulic cylinder inner sleeve (1) to move backward and reset.

2. The prestressed anchor cable isotropic tensioning device according to claim 1, characterized in that: The hydraulic cylinder outer sleeve (6) has at least one outer sleeve chamber (6-1) for respectively passing through each hydraulic cylinder inner sleeve (1).

3. The prestressed anchor cable isotropic tensioning device according to claim 2, characterized in that: The outer wall of each hydraulic cylinder inner sleeve (1) is respectively provided with a flange (1-1) arranged around its outer circumference; the flange (1-1) is sealingly connected to the inner wall of the corresponding outer sleeve chamber (6-1), and is suitable for separating the corresponding outer sleeve chamber (6-1) into a front hydraulic oil chamber (3-1) and a rear hydraulic oil chamber (3-2) that are independent of each other.

4. The prestressed anchor cable isotropic tensioning device according to claim 2, characterized in that: The cover plate (5) has at least one cover plate chamber (5-1); the at least one cover plate chamber (5-1) is suitable for being communicated with each outer sleeve chamber (6-1) respectively, so as to penetrate the front end of each hydraulic cylinder inner sleeve (1) respectively.

5. The prestressed anchor cable isotropic tensioning device according to claim 4, characterized in that: It also includes a sealing plate (14); for a cover plate chamber (5-1) that is not provided with a steel strand (11), the front end of the cover plate chamber (5-1) is sealed by the sealing plate (14).

6. The prestressed anchor cable isotropic tensioning device according to claim 2, characterized in that: The base (7) has at least one base chamber (7-1); the at least one base chamber (7-1) is suitable for being connected to each outer sleeve chamber (6-1) respectively, so as to penetrate the rear end of each hydraulic cylinder inner sleeve (1) respectively.

7. The prestressed anchor cable isotropic tensioning device according to claim 1, characterized in that: The cover plate (5) has a cover plate hydraulic oil communication channel (5-3) which is respectively connected to the cover plate hydraulic oil inlet and outlet (5-2) and each front hydraulic oil chamber (3-1), so as to transport the hydraulic oil from the cover plate hydraulic oil inlet and outlet (5-2) to each front hydraulic oil chamber (3-1).

8. The prestressed anchor cable isotropic tensioning device according to claim 1, characterized in that: The base (7) has a base hydraulic oil communication channel (7-3) which is respectively connected to the base hydraulic oil inlet and outlet (7-2) and each rear hydraulic oil chamber (3-2) so as to transport the hydraulic oil from the base hydraulic oil inlet and outlet (7-2) to each rear hydraulic oil chamber (3-2).

9. The prestressed anchor cable isotropic tensioning device according to claim 1, characterized in that: The anchor (10) has at least one anchor through-hole, and an anchor clip (4-2) is arranged in each of the at least one anchor through-hole; the base (7) also has at least one limit groove (7-4); each limit groove (7-4) in the at least one limit groove (7-4) is provided with a washer (9) and a spring (8) in sequence from back to front; the rear end of the steel strand (11) is suitable for passing through the spring (8) and the washer (9) in sequence and then being fixed to the anchor clip (4-2); the washer (9) is suitable for abutting against the anchor clip (4-2) when the steel strand (11) is tensioned to prevent the anchor clip (4-2) from loosening and compressing the spring (8); the spring (8) is suitable for restoring the compression when the steel strand (11) is released from tension, thereby resetting the washer (9).

10. The prestressed anchor cable isotropic tensioning device according to claim 1, characterized in that: Each hydraulic cylinder inner sleeve (1) is provided with a hydraulic cylinder inner sleeve clamp (4-1) for fixing the front end of the steel strand (11).

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