Jacking and pressing device for tensioning prestressed tendon anchorage device and tensioning equipment

Abstract

The utility model relates to the technical field of anchoring component tensioning tools, in particular to a jacking and pressing device for tensioning a prestressed tendon anchorage device and tensioning equipment, the jacking and pressing device for tensioning the prestressed tendon anchorage device is provided with a jacking and pressing wall surface, and the jacking and pressing wall surface comprises a jacking and pressing conical surface part used for limiting a clamping piece installed in an anchoring conical hole in a conical surface anchoring surface of an anchorage device anchor plate; or the jacking wall surface comprises a jacking spherical surface part used for limiting the clamping piece installed in the anchoring conical hole in the spherical anchoring surface of the anchorage device anchor plate, the jacking conical surface part is used for limiting the clamping piece installed in the anchoring conical hole in the conical anchoring surface, and the jacking conical surface part can make contact with the two sides of the axis of the clamping piece; a clamping piece installed in an anchoring taper hole in the spherical anchoring face is limited through a jacking spherical face part, and the jacking spherical face part can make contact with the edge of a circle in the circumferential direction of the clamping piece. And in the tensioning construction process, the clamping pieces are evenly stressed, the clamping pieces are not prone to deformation, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of anchor tensioning tools, specifically to a top pressure device and tensioning equipment for tensioning prestressed tendon anchors. Background Technology

[0002] Prestressed tendon anchors are commonly used in bridge construction to increase the strength of precast concrete components. The anchors are installed using tensioning equipment. Existing technologies include a jacking tensioning process using a jacking device. The corresponding tensioning equipment includes a matching jacking device and a hydraulic jack. The basic structure of the jacking device and its usage with the jack can be found in the hydraulic through-type jacking device disclosed in Chinese Utility Model Patent No. CN202359502U. This jacking device includes a front cover, a rear cover, a large cylinder body, a limiting plate, and an inner... The piston and main cylinder body are located between the front and rear covers. The limiting plate is located inside the rear cover. The inner piston is located inside the front cover and main cylinder body. The limiting plate is connected to the inner piston. Two oil seals are provided between the inner piston and the main cylinder body. The top pressure device is installed on the cylinder body of the jack. A tool anchor plate is installed at the end of the piston of the jack. A tool clamp is installed on the tool anchor plate. The tensioning working anchor includes a working anchor plate and a working clamp installed on the working anchor plate. The limiting plate and the inner piston together constitute the piston of the top pressure device. The main cylinder body and the rear cover together constitute the cylinder body of the top pressure device. During tensioning, the steel strand passes through the working anchor, top pressure device, jack, tool anchor plate and tool clamp in sequence, so that the working anchor, top pressure device and jack are connected into a whole by the steel strand. The steel strand passes through the conical hole on the working anchor plate and the through hole on the limiting plate. The large end of the working clamp installed in the conical hole on the working anchor plate extends into the space behind the limiting plate in the rear cover of the top pressure device cylinder body. When the jack is started, it moves the tool clamp and tool anchor plate away from the working anchor. The tool clamp clamps and stretches the steel strand, which passes through the moderately loosened working clamp. After the stress and strain of the steel strand reach the required level, the oil pressure inside the jack is maintained, and oil is supplied to the top pressure device. The piston and limit plate inside the top pressure device move towards the working anchor plate. The limit plate pushes the working clamp in the conical hole on the working anchor plate deeper into the conical hole. When the pushing force reaches the required level, the jack pressure is reduced, and the steel strand retracts elastically. The working clamp moves into the conical hole of the working anchor plate as the steel strand retracts. The working clamp uses the conical angle anchoring principle of the cone to reliably anchor the steel strand in the conical hole of the working anchor plate.

[0003] The aforementioned steel strands are prestressed tendons. There are multiple steel strands, and the limiting plate has through holes corresponding to each steel strand. The steel strands pass through the through holes, and the diameter of the through holes is smaller than the outer diameter of the circle containing the large end of the working wedge. When the tensioning equipment is connected to the anchor for installation, the cylinder end cover of the top pressure device is pressed tightly against the working anchor plate. The large end of each working wedge in the wedge hole of the working anchor plate extends into the space inside the cylinder of the top pressure device, located on the side of the limiting plate opposite to the piston body. The plate surface of the limiting plate can be used to press and limit the large end of each working wedge.

[0004] In the above-mentioned type of anchor, the axes of the through holes through which each steel strand passes are parallel to each other and are consistent with the axis direction of the anchor plate. The through holes of the working anchor plate have a tapered hole portion for inserting the working clamps. The large ends of each working clamp are flush. Correspondingly, in order to form a good top pressure contact with each working clamp, the corresponding plate surface of the limiting plate is flat and a top pressure wall surface is provided on the piston constituting the top pressure device.

[0005] Generally, the steel strands will change direction at the anchorage, and there will be a bend in the steel strands inside the anchorage. The spacing between each steel strand will increase and they will extend outwards as they pass through the working anchor plate. To ensure anchoring performance, existing technologies, such as the Chinese utility model patent with authorization announcement number CN202176060U, disclose an anchor. The anchor plate of this anchor has anchoring cone holes and an anchoring surface at the front end. The large-diameter end of each anchoring cone hole extends to the anchoring surface. The anchoring surface includes an inner anchoring surface located in the middle and an outer anchoring surface surrounding and adjacent to the outer periphery of the inner anchoring surface. The inner anchoring surface is planar, and the anchoring cone holes located on the inner anchoring surface are inner anchoring cone holes, with the center line of the inner anchoring cone holes perpendicular to the inner anchoring surface. The outer anchoring surface has a conical or spherical structure, and the anchoring cone holes located on the outer anchoring surface are for allowing prestressing tendons to pass through in a straight line from the corresponding anchor plate. The prestressing tendons do not bend when they pass through the rear end of the outer anchoring cone holes, thus ensuring their working performance.

[0006] For anchor plates with conical or spherical anchoring surfaces, the planar top pressure wall of the top pressure device in existing tensioning equipment is not well-suited. Because the axes of the anchoring cone holes on the conical or spherical surface are not parallel, the large ends of the wedges inside the anchoring cone holes are also not aligned. When using existing tensioning equipment, the top pressure wall of the piston of the top pressure device can only contact a small portion of the edge of the wedges near the center of the anchor plate. As a result, the wedges are subjected to uneven stress when the prestressing tendons are tightened, which can easily lead to deformation and affect their service life. Utility Model Content

[0007] The purpose of this utility model is to provide a top pressure device for tensioning prestressed tendon anchors, so as to solve the problem that the top pressure wall of the piston of the top pressure device of the existing prestressed tendon anchor tensioning equipment causes uneven stress on the clamping plates installed in the anchor cone holes on the conical or spherical anchoring surface, which easily leads to deformation and failure; the purpose of this utility model is also to provide a prestressed tendon anchor tensioning device to solve the above problems.

[0008] The technical solution of the prestressed tendon anchor tensioning jacking device of this utility model is:

[0009] A top pressure device for tensioning prestressed tendon anchors includes a cylinder and a piston disposed within the cylinder. The piston has a top pressure wall surface, which includes a top pressure cone section for pressing the clamping pieces installed in the anchor cone holes on the conical anchoring surface of the anchor plate, or a top pressure spherical section for limiting the clamping pieces installed in the anchor cone holes on the spherical anchoring surface of the anchor plate.

[0010] Furthermore, the cylinder of the top presser is provided with a cone-shaped abutment surface that is adapted to and abuts against the cone-shaped anchoring surface on the anchor plate, or a spherical abutment surface that is adapted to and abuts against the spherical anchoring surface on the anchor plate.

[0011] Furthermore, the piston of the pressure device has a pressure sidewall, and the pressure wall surface is provided on the pressure sidewall. The pressure sidewall is provided with a guide hole that penetrates the pressure conical part or the pressure spherical part. The guide hole allows the corresponding prestressing tendon to pass through. The guide hole includes a straight hole section and a conical hole section. The straight hole section has an orifice located on the pressure wall surface. The conical hole section is located on the side of the straight hole section away from the pressure wall surface. The extension line of the centerline of the straight hole section passes through the centerline of the pressure conical part or the center of the sphere where the pressure spherical part is located.

[0012] Furthermore, the centerline of the tapered hole section is set at an angle to the centerline of the straight hole section.

[0013] Furthermore, the generatrix of the inner wall surface of the tapered bore section closest to the piston axis is parallel to the piston axis.

[0014] The beneficial effects of the prestressed tendon anchor tensioning jacking device of this utility model are as follows: Based on the existing prestressed tendon anchor tensioning jacking device, this utility model modifies its components, giving the piston of the jacking device a jacking conical surface that matches the conical anchoring surface of the anchor plate, or a jacking spherical surface that matches the spherical anchoring surface of the anchor plate. The jacking conical surface limits the clamping pieces installed in the anchoring conical holes on the conical anchoring surface, and the jacking conical surface can form contact on both sides of the clamping piece's axis. Similarly, the jacking spherical surface limits the clamping pieces installed in the anchoring conical holes on the spherical anchoring surface, and the jacking spherical surface can form contact around the circumference of the clamping piece. During tensioning, this facilitates uniform stress on the clamping pieces, reduces deformation, and improves service life.

[0015] The technical solution of this utility model for prestressed tendon anchor tensioning equipment is as follows:

[0016] A prestressed tendon anchor tensioning device includes a top presser, which includes a cylinder and a piston disposed within the cylinder. The piston is provided with a top press wall surface, which includes a top press cone section for pressing the clamping piece installed in the anchor cone hole on the cone anchoring surface of the anchor plate, or a top press spherical section for limiting the clamping piece installed in the anchor cone hole on the spherical anchoring surface of the anchor plate.

[0017] Furthermore, the cylinder of the top presser is provided with a cone-shaped abutment surface that is adapted to and abuts against the cone-shaped anchoring surface on the anchor plate, or a spherical abutment surface that is adapted to and abuts against the spherical anchoring surface on the anchor plate.

[0018] Furthermore, the piston of the pressure device has a pressure sidewall, and the pressure wall surface is provided on the pressure sidewall. The pressure sidewall is provided with a guide hole that penetrates the pressure conical part or the pressure spherical part. The guide hole allows the corresponding prestressing tendon to pass through. The guide hole includes a straight hole section and a conical hole section. The straight hole section has an orifice located on the pressure wall surface. The conical hole section is located on the side of the straight hole section away from the pressure wall surface. The extension line of the centerline of the straight hole section passes through the centerline of the pressure conical part or the center of the sphere where the pressure spherical part is located.

[0019] Furthermore, the centerline of the tapered hole section is set at an angle to the centerline of the straight hole section.

[0020] Furthermore, the generatrix of the inner wall surface of the tapered bore section closest to the piston axis is parallel to the piston axis.

[0021] The beneficial effects of this utility model of prestressed tendon anchor tensioning equipment are as follows: This utility model modifies the elements of the jacking device in existing prestressed tendon anchor tensioning equipment, making the jacking wall surface on the piston of the jacking device have a jacking conical surface that matches the conical anchoring surface of the anchor plate, or a jacking spherical surface that matches the spherical anchoring surface of the anchor plate. The jacking conical surface is used to limit the clamping pieces installed in the anchoring conical holes on the conical anchoring surface, and the jacking conical surface can form contact on both sides of the clamping piece's axis. Similarly, the jacking spherical surface is used to limit the clamping pieces installed in the anchoring conical holes on the spherical anchoring surface, and the jacking spherical surface can form contact around the circumference of the clamping piece. During tensioning construction, this facilitates uniform stress on the clamping pieces, reduces the likelihood of deformation, and improves service life. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the prestressed tendon anchor tensioning device and the anchor used in conjunction with an embodiment of this utility model;

[0023] Figure 2 for Figure 1 A magnified view of section A in the image.

[0024] In the diagram: 100, hydraulic jack; 1, jacking cylinder; 2, jacking piston; 20, jacking sidewall; 21, tapered section; 22, straight section; 23, jacking spherical surface; 3, working clamp; 4, working anchor plate; 41, spherical anchoring surface; 5, anchor plate; 6, steel strand. Detailed Implementation

[0025] The piston of the jacking device of the prestressed tendon anchor tensioning equipment of this utility model has a jacking conical part that matches the conical anchoring surface of the anchor plate or a jacking spherical part that matches the spherical anchoring surface of the anchor plate; the jacking conical part is used to limit the clamping pieces installed in the anchoring conical holes on the conical anchoring surface, and the jacking conical part can form contact on both sides of the clamping piece's axis; the jacking spherical part is used to limit the clamping pieces installed in the anchoring conical holes on the spherical anchoring surface, and the jacking spherical part can form contact around the edge of the clamping piece; during tensioning construction, this is conducive to uniform stress on the clamping pieces, and the clamping pieces are less prone to deformation, which helps to improve service life.

[0026] Examples of the prestressed tendon anchor tensioning device of this utility model:

[0027] like Figure 1 , Figure 2 As shown, the prestressed tendon anchor tensioning equipment includes a hydraulic jack 100, a jacking device and tool clamps, and a tool anchor plate. The jacking device includes a cylinder body and a piston disposed within the cylinder body. The jacking device is a hydraulic cylinder, the cylinder body of which is the jacking device cylinder body 1, and the piston of which is the jacking device piston 2. One end of the jacking device cylinder body 1 is connected to one end of the cylinder body of the hydraulic jack 100. The tool anchor plate is connected to one end of the piston rod of the hydraulic jack 100. The tool clamps are installed in the corresponding through holes of the tool anchor plate. The prestressed tendon anchor tensioning equipment is used with prestressed tendon anchors to tension the steel strands 6. The steel strands 6 constitute the prestressed tendons. The prestressed tendon anchor is also known as the working anchor. The working anchor includes a working anchor plate 4 and an anchor pad plate 5. The working anchor plate 4 is the anchor plate, and the anchor pad plate 5 is fixed in the precast concrete component. The exposed end of the working anchor plate 4 is connected to the anchor pad plate 5. The basic principle and process of using this type of prestressed tendon anchor tensioning equipment with a top pressure device for tensioning construction are existing technologies and will not be elaborated here.

[0028] The working anchor plate 4 has a through hole for the steel strand 6 to pass through. The through hole includes an anchoring cone hole. A working clamp 3 is installed inside the anchoring cone hole. The working clamp 3 is an arc-shaped piece that fits the outer circle of the steel strand 6. Several working clamps 3 are used to hold the steel strand 6 tightly around its perimeter. The thickness of the larger end of the working clamp 3 is greater than the thickness of the smaller end. The front end of the working anchor plate 4 away from the anchor pad 5 has an anchoring surface. The large-diameter end of each anchoring cone hole extends to the anchoring surface. The anchoring surface includes an inner anchoring surface located in the middle part and an outer anchoring surface surrounding and adjacent to the outer perimeter of the inner anchoring surface. The inner anchoring surface is a plane. The anchoring cone hole located on the inner anchoring surface is the inner anchoring cone hole. The centerline of the inner anchoring cone hole is perpendicular to the inner anchoring surface, and the direction of the centerline of the inner anchoring cone hole is consistent with the axial direction of the working anchor plate 4. The outer anchoring surface is a spherical structure, that is, the outer anchoring surface is a spherical anchoring surface 41. The anchoring cone hole located on the outer anchoring surface is used for the steel strand 6 to pass through the corresponding anchor plate 5 in a straight line. The extension line of the center line of the outer anchoring cone hole passes through the center of the spherical surface where the spherical anchoring surface 41 is located. The steel strand 6 does not bend when it passes through the rear end of the outer anchoring cone hole, that is, the corresponding steel strand 6 does not bend when it passes through the working anchor plate 4 to ensure its working performance.

[0029] The pressurizer piston 2 has a cylindrical structure, and its opening faces the hydraulic jack 100 during use. The pressurizer piston 2 can be a one-piece molded structure. The pressurizer piston 2 has a cylindrical side wall and a cylindrical bottom wall, which together form an inner cavity. The circumferential outer wall of the cylindrical side wall of the pressurizer piston 2 is provided with a part for sliding and sealing with the inner wall of the pressurizer cylinder 1 to ensure that the pressurizer piston 2 can move relative to the pressurizer cylinder 1 under hydraulic action. The bottom wall of the pressurizer piston 2 forms a pressurizing side wall 20. The pressurizing side wall 20 is provided with through holes for the steel strand 6 to pass through. The through holes on the pressurizer piston 2 correspond one-to-one with the through holes on the working anchor plate 4. The side of the pressurizing side wall 20 of the pressurizer piston 2 closest to the working anchor plate 4 forms a pressurizing wall surface. All through holes on the pressurizer piston 2 penetrate the pressurizing wall surface. An annular groove is provided at the opening on the side of the top presser cylinder 1 that mates with the working anchor plate 4. The annular groove is arranged around the axis of the top presser cylinder 1, and the bottom of the groove is connected to the inner wall of the top presser cylinder 1. During construction, the front end of the working anchor plate 4 extends into the annular groove and abuts against the bottom surface of the groove. The large end of the working clamp 3 can extend into the space inside the top presser cylinder 1 located on the side of the top presser piston 2 facing the working anchor plate 4. When tensioning the steel strand 6, the steel strand 6 will extend outward from the corresponding conical hole along with the working clamp 3. The extension amount of the working clamp 3 can be limited by the top pressing side wall 20 of the top presser piston 2. When the steel strand 6 retracts, the top presser piston 2 moves towards the working anchor plate 4 through hydraulic action. The top pressing side wall 20 of the top presser piston 2 will push the large end of each working clamp 3 to move deeper into the corresponding conical hole, which facilitates control of the retraction amount of the steel strand 6.

[0030] The special feature of this prestressed tendon anchor tensioning device lies in the pressing and limiting fit structure of the jacking device on the working anchor plate 4 and the working wedge 3. Specifically, the pressing wall surface on the pressing side wall 20 of the pressing piston 2 includes an inner pressing surface located in the middle and an outer pressing surface surrounding and adjacent to the outer periphery of the inner pressing surface. The inner pressing surface is planar, and the outer pressing surface is a spherical structure, forming a pressing spherical part 23. When the jacking device is fitted with the working anchor plate 4, the spherical surface of the pressing spherical part 23 of the jacking device piston 2 and the spherical surface of the working anchor plate 44 have the same center. The pressing spherical part 23 is used to press the working wedge 3 installed in the anchoring cone hole on the spherical anchoring surface 41 of the working anchor plate 4. The pressing spherical part 23 can form contact with the circumferential edge of the large end of the working wedge 3 in the corresponding cone hole. During tensioning construction, this is beneficial for the working wedge 3 to be subjected to uniform force and less prone to deformation, thus improving its service life.

[0031] The end face of the large end of the working clamp 3 is flat, and the length direction of the working clamp 3 is consistent with the center line direction of the anchoring cone hole on the working anchor plate 4. The inner pressing surface of the presser piston 2 is used to limit and press the working clamp 3 installed in the anchoring cone hole on the inner anchoring surface of the working anchor plate 4. The through hole on the inner pressing surface of the presser piston 2 and the through hole on the inner anchoring surface of the working anchor plate 4 allow the corresponding steel strand 6 to pass through in a straight line.

[0032] The bottom surface of the annular groove of the top presser cylinder 1 is a spherical structure, and the spherical surface and the spherical surface of the top presser spherical surface 23 are at the same center. The bottom surface of the annular groove of the top presser piston 2 forms an abutting spherical surface for matching and abutting with the spherical anchoring surface 41 on the working anchor plate 4, so as to ensure that the top presser piston 2 and the working anchor plate 4 are subjected to uniform force at the abutment point.

[0033] The through hole on the top-pressure sidewall 20 of the top-pressure piston 2 communicates with the inner cavity of the cylinder of the top-pressure piston 2 to allow the steel strand 6 to pass through the top-pressure piston 2. The through hole on the top-pressure spherical part 23 of the top-pressure piston 2 is a guide hole, which is used to guide the corresponding steel strand 6 to change direction so that each steel strand 6 is parallel to each other after passing through the top-pressure sidewall 20 of the top-pressure piston 2. The guide hole includes a straight hole section 22 and a tapered hole section 21. The straight hole section 22 has an orifice located on the top-pressure spherical part 23, and the diameter of the orifice is smaller than the outer diameter of the circle where the large end of the working clamp 3 is located. The straight hole section 22 is a constant diameter hole. The tapered hole section 21 is located on the side of the straight hole section 22 away from the top-pressure spherical part 23. The small diameter end of the tapered hole section 21 is connected to the straight hole section 22, and the large diameter end of the tapered hole section 21 extends to the side wall of the top-pressure sidewall 20 opposite to the working anchor plate 4. The centerline extension of the straight hole section 22 passes through the center of the sphere containing the pressure ball surface 23, to prevent the steel strand 6 from being cut by the edge of the hole in the straight hole section 22 located in the pressure ball surface 23 when it passes through. The centerline of the straight hole section 22 coincides with the normal at the corresponding position of the pressure ball surface 23, so the steel strand 6 does not bend when passing through the straight hole section 22, but bends at the tapered hole section 21. The tapered hole section 21 can be used to change the extension direction of the steel strand 6 and reduce the resistance when passing through.

[0034] The centerline of the tapered section 21 forms an angle with the centerline of the straight section 22. The angle between the centerline of the tapered section 21 and the axis of the presser piston 2 is greater than the angle between the centerline of the straight section 22 and the axis of the presser piston 2. This allows for the reversal of the direction of the steel strand 6 while minimizing the space occupied by the tapered section 21, thus ensuring the structural strength of the presser piston 2. The inner wall of the tapered section 21 is a conical surface. The generatrix of the inner wall of the tapered section 21 closest to the axis of the presser piston 2 is parallel to the axis of the presser piston 2. This facilitates the passage of the steel strand 6 parallel to the axis of the presser piston 2 through the tapered section 21 and provides support for the steel strand 6.

[0035] In other embodiments, when the outer anchoring surface of the working anchor plate is a conical anchoring surface, the outer pressing surface of the pressing wall can also be a pressing conical surface used to limit the clamping pieces installed in the anchoring conical holes on the conical anchoring surface of the working anchor plate, wherein the centerline of the straight hole section is perpendicular to the corresponding generatrix of the conical surface on which the outer pressing surface is located. In this case, the pressing cylinder is provided with an abutting conical surface for adapting and abutting against the conical anchoring surface on the working anchor plate.

[0036] In other embodiments, the through holes on the top pressure sidewall of the top pressure piston are all equal diameter holes, and the corresponding steel strands pass through the corresponding through holes in the top pressure spherical surface before changing direction.

[0037] In other embodiments, the centerline of the tapered hole section and the centerline of the straight hole section can also be collinear, as long as the direction of the steel strand changes.

[0038] An embodiment of the prestressed tendon anchor tensioning top pressure device of this utility model:

[0039] The jacking device for tensioning the prestressed tendon anchor in this embodiment is the same as the jacking device for the prestressed tendon anchor tensioning device of the present invention, and will not be described again here.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A jacking device for tensioning prestressed tendon anchorages, characterized in that, The top pressure device includes a cylinder body and a piston disposed within the cylinder body. The piston is provided with a top pressure wall surface, which includes a top pressure cone section for pressing the clamping piece installed in the anchor cone hole on the cone anchoring surface of the anchor plate, or a top pressure spherical section for limiting the clamping piece installed in the anchor cone hole on the spherical anchoring surface of the anchor plate.

2. The jacking device for tensioning prestressed tendon anchors according to claim 1, characterized in that, The cylinder of the top presser is provided with a cone-shaped abutting surface that is adapted to and abuts against the cone-shaped anchoring surface on the anchor plate, or a spherical abutting surface that is adapted to and abuts against the spherical anchoring surface on the anchor plate.

3. The tensioning device for prestressed tendon anchorages according to claim 1 or 2, characterized in that, The piston of the pressure device has a pressure sidewall, and the pressure wall surface is provided on the pressure sidewall. The pressure sidewall is provided with a guide hole that passes through the pressure conical part or the pressure spherical part. The guide hole allows the corresponding prestressing tendon to pass through. The guide hole includes a straight hole section and a conical hole section. The straight hole section has an orifice located on the pressure wall surface. The conical hole section is located on the side of the straight hole section away from the pressure wall surface. The extension line of the center line of the straight hole section passes through the center line of the pressure conical part or the center of the sphere on which the pressure spherical part is located.

4. The jacking device for tensioning prestressed tendon anchors according to claim 3, characterized in that, The centerline of the tapered hole section is set at an angle to the centerline of the straight hole section.

5. The tensioning device for prestressed tendon anchorages according to claim 4, characterized in that, The generatrix of the inner wall surface of the tapered bore section closest to the piston axis is parallel to the piston axis.

6. A prestressed tendon anchorage tensioning device, characterized in that, Includes the prestressed tendon anchor tensioning top pressure device as described in any one of claims 1-5.

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