Limiting plate for tensioning prestressed tendon anchorage device and tensioning equipment

Abstract

The utility model relates to the technical field of tensioning tools of anchoring components, in particular to a limiting plate for tensioning a prestressed tendon anchorage device and tensioning equipment, the limiting plate for tensioning the prestressed tendon anchorage device is provided with a limiting wall surface, and the limiting wall surface comprises a limiting 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 limiting wall surface comprises a limiting spherical surface part used for limiting the clamping piece installed in the anchoring taper hole in the spherical anchoring surface of the anchorage device anchor plate, the limiting conical surface part is used for limiting the clamping piece installed in the anchoring taper hole in the conical anchoring surface, and the limiting conical surface part can make contact on the two sides of the axis of the clamping piece; the limiting spherical surface part is used for limiting the clamping piece installed in the anchoring taper hole in the spherical anchoring surface, and the limiting spherical surface 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] The utility model relates to the technical field of tensioning tools for anchoring members, and particularly relates to a limiting plate and a tensioning device for tensioning prestressed tendon anchors. Background Art

[0002] Prestressed tendon anchors are often used to improve the strength of precast concrete members during bridge construction. The anchor is installed and constructed through a tensioning device. The basic structure of the anchor tensioning device can be referred to a prestressed anchor steel strand tensioning device disclosed in the Chinese utility model patent with the authorization announcement number CN214656391U. The tensioning device includes tool wedges, a tool anchor ring, a transition sleeve, a jack, and a limiting plate. The steel strand passes through the tool wedges, the tool anchor ring, the transition sleeve, the jack, and the limiting plate in sequence. One side of the limiting plate is connected to the prestressed anchor through the steel strand, the limiting plate is connected to the base of the jack, the working end of the jack is installed with a transition sleeve, a tool anchor ring is installed inside the transition sleeve, and tool wedges are installed inside the tool anchor ring; the prestressed anchor includes working wedges, a working anchor ring, an anchor backing plate, and a spiral rib. The large end of the working wedges abuts against the limiting plate, the small end of the working wedges is connected to the through hole on the working anchor ring, and the working anchor ring is installed on the anchor backing plate; when installing the anchor, the steel strand at the prestressed anchor end passes through the limiting plate, the jack, the transition sleeve, the tool anchor ring, and the tool wedges in sequence, so that the entire tensioning device is connected into a whole by the steel strand. When the jack is started, it drives the tool wedges and the tool anchor ring away from the prestressed anchor, and the prestressed anchor is also tightened by the limiting plate. Therefore, the prestressed anchor cannot displace, so that the steel strand pre-installed in the prestressed anchor is tightened by the tool wedges; after the stress and strain of the steel strand reach the requirements, the pressure of the jack is reduced, the steel strand undergoes elastic retraction, the working wedges and the steel strand move synchronously into the through hole of the anchor ring, and the working wedges use the conical anchoring principle of the cone to reliably anchor the steel strand in the conical hole of the anchor ring.

[0003] The above-mentioned steel strand is the prestressed tendon, and there are multiple steel strands. The limiting plate is provided with through holes corresponding to the steel strands one by one, and the steel strands pass through the through holes. The aperture of the through hole is smaller than the large end of the working wedges. In order to make the tool wedges extend outwards when the steel strand is tightened and avoid excessive outward displacement, the limiting plate is provided with a limiting groove. Each through hole communicates with the bottom of the limiting groove. The notch area of the limiting groove covers each wedge hole on the working anchor ring. When connecting the tensioning device to the anchor for installation and construction, the notch edge of the limiting groove of the limiting plate presses against the end face of the working anchor ring, and the large end of the working wedges in each wedge hole of the working anchor ring extends into the limiting groove, and the bottom surface of the limiting groove is used to limit the large end of each working wedge. The limiting groove has a set depth to control the outward displacement amount of the working wedges.

[0004] The axes of the through holes for each steel strand to pass through the working anchor ring of the above-mentioned anchor are parallel to each other and in the same direction as the axis of the anchor ring. The through holes of the working anchor ring are also the clip holes for installing the working wedges. The large ends of the working wedges are flush. Correspondingly, in order to form good limitation for each working wedge, the bottom surface of the limiting groove is a plane and constitutes the limiting wall surface.

[0005] Generally, the steel strand changes direction at the anchor. The steel strand has a bent section in the anchor, and the spacing between the steel strands at the part passing through the anchor ring becomes larger and they extend dispersedly. In order to ensure the anchoring performance, in the prior art, an anchor is disclosed in the Chinese utility model patent with the authorization announcement number CN202176060U. The anchor plate of this anchor is the anchor ring. The anchor plate has an anchoring tapered hole and an anchoring surface at the front end. The large-diameter ends of the anchoring tapered holes all extend to the anchoring surface. The anchoring surface includes an inner anchoring surface in the middle part and an outer anchoring surface surrounding and adjacent to the outer periphery of the inner anchoring surface. The inner anchoring surface is a plane, and the anchoring tapered hole located on the inner anchoring surface is an inner anchoring tapered hole. The center line of the inner anchoring tapered hole is perpendicular to the inner anchoring surface; the outer anchoring surface is a conical structure or a spherical structure. The anchoring tapered hole located on the outer anchoring surface is an outer anchoring tapered hole for the prestressing tendon to penetrate linearly from the corresponding anchor backing plate. When the prestressing tendon penetrates from the rear end of the outer anchoring tapered hole, it does not bend, ensuring its working performance.

[0006] For the above-mentioned anchor plate with a conical or spherical anchoring surface, the limiting plate with a flat bottom surface in the prior art tensioning equipment is not well applicable. Since the axes of the anchoring tapered holes provided on the conical or spherical surface are not parallel, correspondingly, the large ends of the wedges in the anchoring tapered holes are not flush. For the outer ring of wedges, when using the tensioning equipment in the prior art for construction, the limiting wall surface of the limiting plate of the tensioning equipment can only contact a small part of the edge close to the center of the anchor plate of the outer ring of wedges. In this way, when the prestressing tendon is tightened, the wedges are unevenly stressed and are prone to deformation, thus affecting the service life. Summary of the Invention

[0007] The purpose of the present invention is to provide a limiting plate for tensioning a prestressing tendon anchor to solve the problem that the limiting plate of the existing prestressing tendon anchor tensioning equipment causes uneven stress on the wedges installed in the anchoring tapered holes on the conical or spherical anchoring surface and is prone to deformation and failure; the purpose of the present invention is also to provide a prestressing tendon anchor tensioning equipment to solve the above problems.

[0008] The technical solution of the limiting plate for tensioning a prestressing tendon anchor of the present invention is:

[0009] A limiting plate for tensioning a prestressed tendon anchor is provided with a limiting wall surface, the limiting wall surface includes a limiting conical surface portion for limiting a clip installed in an anchoring cone hole on the conical anchoring surface of the anchor plate, or the limiting wall surface includes a limiting spherical surface portion for limiting a clip installed in an anchoring cone hole on the spherical anchoring surface of the anchor plate.

[0010] Furthermore, a limiting groove is provided on the limiting plate, the limiting wall surface is arranged in the limiting groove, and the notch of the limiting groove is provided with an abutting conical surface portion for adapting and abutting with the conical anchoring surface on the anchor plate or an abutting spherical surface portion for adapting and abutting with the spherical anchoring surface on the anchor plate.

[0011] Furthermore, the limiting plate is provided with a guide through-hole which passes through the limiting conical surface or the limiting spherical surface, and the guide through-hole is for the corresponding prestressed tendons to pass through the limiting plate. The guide through-hole includes a straight hole section and a tapered hole section. The straight hole section has an orifice located on the limiting wall surface, and the tapered hole section is arranged on the side of the straight hole section away from the limiting wall surface. The center line extension line of the straight hole section passes through the center line of the limiting conical surface or the center of the sphere where the limiting spherical surface is located.

[0012] Furthermore, the center line of the tapered hole section is arranged to form an angle with the center line of the straight hole section.

[0013] Furthermore, a generatrix of the inner wall surface of the tapered hole section closest to the axis of the limiting plate is parallel to the axis of the limiting plate.

[0014] The beneficial effects of the limiting plate for prestressed tendon anchor tensioning of the present invention: the present invention changes the elements on the basis of the limiting plate for prestressed tendon anchor tensioning in the prior art, so that the limiting wall surface of the limiting plate has a limiting conical surface portion that matches the conical anchoring surface of the anchor plate or has a limiting spherical surface portion that matches the spherical anchoring surface of the anchor plate; the limiting conical surface portion is used to limit the clip installed in the anchor cone hole on the conical anchoring surface, and the limiting conical surface portion can form contact on both sides of the clip axis; the limiting spherical surface portion is used to limit the clip installed in the anchor cone hole on the spherical anchoring surface, and the limiting spherical surface portion can form contact on a circumferential edge of the clip; during tensioning construction, it is beneficial to uniformly bear the force on the clip, and the clip is not easy to deform, which is beneficial to improve the service life.

[0015] The technical solution of the prestressed tendon anchor tensioning device of the utility model is:

[0016] The prestressed tendon anchor tensioning equipment includes a limiting plate, which is provided with a limiting wall surface. The limiting wall surface includes a limiting conical surface portion for limiting the clip installed in the anchor cone hole on the conical anchoring surface of the anchor plate, or the limiting wall surface includes a limiting spherical surface portion for limiting the clip installed in the anchor cone hole on the spherical anchoring surface of the anchor plate.

[0017] Furthermore, a limiting groove is provided on the limiting plate, the limiting wall surface is arranged in the limiting groove, and the notch of the limiting groove is provided with an abutting conical surface portion for adapting and abutting with the conical anchoring surface on the anchor plate or an abutting spherical surface portion for adapting and abutting with the spherical anchoring surface on the anchor plate.

[0018] Furthermore, the limiting plate is provided with a guide through-hole which passes through the limiting conical surface or the limiting spherical surface, and the guide through-hole is for the corresponding prestressed tendons to pass through the limiting plate. The guide through-hole includes a straight hole section and a tapered hole section. The straight hole section has an orifice located on the limiting wall surface, and the tapered hole section is arranged on the side of the straight hole section away from the limiting wall surface. The center line extension line of the straight hole section passes through the center line of the limiting conical surface or the center of the sphere where the limiting spherical surface is located.

[0019] Furthermore, the center line of the tapered hole section is arranged to form an angle with the center line of the straight hole section.

[0020] Furthermore, a generatrix of the inner wall surface of the tapered hole section closest to the axis of the limiting plate is parallel to the axis of the limiting plate.

[0021] The beneficial effects of the prestressed tendon anchor tensioning device of the present invention: the present invention changes the elements on the basis of the limiting plate of the prestressed tendon anchor tensioning device in the prior art, so that the limiting wall surface of the limiting plate has a limiting conical surface portion that matches the conical anchoring surface of the anchor plate or has a limiting spherical surface portion that matches the spherical anchoring surface of the anchor plate; the limiting conical surface portion is used to limit the clip installed in the anchor cone hole on the conical anchoring surface, and the limiting conical surface portion can form contact on both sides of the clip axis; the limiting spherical surface portion is used to limit the clip installed in the anchor cone hole on the spherical anchoring surface, and the limiting spherical surface portion can form contact on a circumferential edge of the clip; during tensioning construction, it is beneficial to uniformly bear the force on the clip, the clip is not easy to deform, and it is beneficial to improve the service life. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 for Figure 1 A partial enlarged view of point A in the figure.

[0024] In the figure: 1. Hydraulic jack; 2. Limiting plate; 21. Tapered hole section; 22. Straight hole section; 23. Limiting spherical section; 3. Working clip; 4. Working anchor plate; 41. Spherical anchoring surface; 5. Anchor plate; 6. Steel strand. DETAILED DESCRIPTION

[0025] The limiting plate of the prestressed tendon anchor tensioning device of the present utility model has a limiting conical surface portion matching the conical anchoring surface of the anchor plate or has a limiting spherical surface portion matching the spherical anchoring surface of the anchor plate; the limiting conical surface portion is used to limit the wedge-shaped clamp installed in the anchoring conical hole on the conical anchoring surface, and the limiting conical surface portion can form contacts on both sides of the axis of the wedge-shaped clamp; the limiting spherical surface portion is used to limit the wedge-shaped clamp installed in the anchoring conical hole on the spherical anchoring surface, and the limiting spherical surface portion can form contacts on the circumferential edge of the wedge-shaped clamp in a circle; during tensioning construction, it is beneficial to make the wedge-shaped clamps stress evenly, the wedge-shaped clamps are not prone to deformation, and it is beneficial to improve the service life.

[0026] An embodiment of the prestressed tendon anchor tensioning device of the present utility model:

[0027] As Figure 1 、 Figure 2 shown, the prestressed tendon anchor tensioning device includes a hydraulic jack 1, a limiting plate 2, a tool wedge-shaped clamp, and a tool anchor plate. The limiting plate 2 is connected to one end of the cylinder body of the hydraulic jack 1, the tool anchor plate is connected to one end of the piston rod of the hydraulic jack 1, and the tool wedge-shaped clamp is installed in the corresponding through hole of the tool anchor plate. The prestressed tendon anchor tensioning device is used in combination with the prestressed tendon anchor to perform tensioning construction on the steel strand 6. The steel strand 6 constitutes the prestressed tendon. The prestressed tendon anchor includes a working anchor plate 4 and an anchor backing plate 5. The working anchor plate 4 is the anchor plate of the anchor, and the anchor backing plate 5 is fixed in the concrete precast member. The anchor plate is connected to the exposed end of the anchor backing plate 5. The principle and process of using the prestressed tendon anchor tensioning device for tensioning construction are prior art and will not be described herein.

[0028] The working anchor plate 4 is provided with a through hole for the steel strand 6 to pass through. The through hole includes an anchoring conical hole portion. The anchoring conical hole is filled with a working wedge-shaped clamp 3. The working wedge-shaped clamp 3 is an arc-shaped piece adapted to the outer circle of the steel strand 6. A plurality of working wedge-shaped clamps 3 are used to hold the steel strand 6 tightly around. The thickness of the large end of the working wedge-shaped clamp 3 is greater than that of the small end. The front end of the working anchor plate 4 away from the anchor backing plate 5 is provided with an anchoring surface. The large-diameter ends of the respective anchoring conical holes all extend to the anchoring surface. The anchoring surface includes an inner anchoring surface in the middle part and an outer anchoring surface surrounding and adjacent to the outer periphery of the inner anchoring surface. The inner anchoring surface is a plane. The anchoring conical hole located on the inner anchoring surface is an inner anchoring conical hole. The center line of the inner anchoring conical hole is perpendicular to the inner anchoring surface. The direction of the center line of the inner anchoring conical hole is consistent with the axis 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 conical hole located on the outer anchoring surface is an outer anchoring conical hole for the steel strand 6 to penetrate linearly from the corresponding anchor backing plate 5. The extension line of the center line of the outer anchoring conical hole passes through the center of the sphere of the sphere where the spherical anchoring surface 41 is located. When the steel strand 6 penetrates from the rear end of the outer anchoring conical hole, it does not bend, that is, the corresponding steel strand 6 does not bend when passing through the working anchor plate 4 to ensure its working performance.

[0029] The limiting plate 2 is provided with through holes for the steel strand 6 to pass through. The through holes on the limiting plate 2 correspond one by one to the through holes on the working anchor plate 4. One end of the limiting plate 2 close to the working anchor plate 4 is provided with a limiting groove. Each through hole on the limiting plate 2 penetrates through the bottom surface of the limiting groove. A ring groove is provided at the notch of the limiting groove on the limiting plate 2. The ring groove is arranged around the axis of the limiting plate 2 and is located outside the notch of the limiting groove. During construction, the front end of the working anchor plate 4 extends into the ring groove and abuts against the bottom surface of the ring groove. The large end of the working wedge 3 can extend into the limiting groove, and the outer extension amount of the working wedge 3 is limited by the bottom surface of the limiting groove.

[0030] What is special about the tensioning equipment for the prestressing tendon anchor is the limiting and matching structure of the limiting plate 2 with the working anchor plate 4 and the working wedge 3. Specifically, the bottom surface of the limiting groove constitutes a limiting wall surface. The limiting wall surface includes an inner limiting surface in the middle part and an outer limiting surface surrounding and adjacent to the outer periphery of the inner limiting surface. The inner limiting surface is a plane, and the outer limiting surface is a spherical structure. The outer limiting surface constitutes the limiting spherical surface part 23. When the limiting plate 2 is matched with the working anchor plate 4, the spherical surface where the limiting spherical surface part 23 is located and the spherical surface where the spherical anchoring surface 41 is located have the same center of the sphere. The limiting spherical surface part 23 is used to limit the working wedge 3 installed in the anchoring taper hole on the spherical anchoring surface 41 of the working anchor plate 4. The limiting spherical surface part 23 can form contact with the circumferential edge of the large end of the corresponding working wedge 3. During the tensioning construction, it is beneficial for the working wedge 3 at this place to be stressed evenly and not prone to deformation, which is beneficial to improving the service life.

[0031] The end face of the large end of the working wedge 3 is a plane, and the length direction of the working wedge 3 is consistent with the center line direction of the anchoring taper hole on the working anchor plate 4. The inner limiting surface of the limiting plate 2 is used to limit the working wedge 3 installed in the anchoring taper hole on the inner anchoring surface of the working anchor plate 4. The through holes on the inner limiting surface of the limiting plate 2 and the through holes on the inner anchoring surface of the working anchor plate 4 are for the corresponding steel strand 6 to pass through linearly.

[0032] The bottom surface of the ring groove of the limiting plate 2 is a spherical structure, and this spherical surface has the same center of the sphere as the spherical surface where the limiting spherical surface part 23 is located. The bottom surface of the ring groove of the limiting plate 2 constitutes a butting spherical surface part for adaptively butting against the spherical anchoring surface 41 on the working anchor plate 4 to ensure uniform stress at the butting place between the limiting plate 2 and the working anchor plate 4.

[0033] The through holes provided in the limiting plate 2 on the limiting ball surface 23 are guiding perforations, and the guiding perforations are used to guide the corresponding steel strands 6 to change direction, so that each steel strand 6 is parallel to each other after passing through the limiting plate 2. The guiding perforation includes a straight hole section 22 and a tapered hole section 21. The straight hole section 22 has an orifice located on the limiting ball surface 23 and the diameter of the orifice is smaller than the outer diameter of the circle where the large end of the working wedge 3 is located. The straight hole section 22 is a hole with a constant diameter. The tapered hole section 21 is arranged on the side of the straight hole section 22 away from the limiting ball surface 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 one end face of the limiting plate 2 facing away from the working anchor plate 4. The extension line of the center line of the straight hole section 22 passes through the center of the sphere where the limiting ball surface 23 is located, so as to prevent the edge of the orifice of the straight hole section 22 located on the limiting ball surface 23 from cutting the steel strand 6 when the steel strand 6 passes through. The center line of the straight hole section 22 coincides with the normal line at the corresponding position of the limiting ball surface 23, and the steel strand 6 does not bend when passing through the straight hole section 22, but bends and changes direction at the tapered hole section 21. The tapered hole section 21 can change the extension direction of the steel strand 6 and reduce the passing resistance.

[0034] The center line of the tapered hole section 21 is arranged at an angle with the center line of the straight hole section 22. The angle between the center line of the tapered hole section 21 and the axis of the limiting plate 2 is greater than the angle between the center line of the straight hole section 22 and the axis of the limiting plate 2. While realizing the direction change of the steel strand 6, it is convenient to reduce the space occupied by the tapered hole section 21 and ensure the structural strength of the limiting plate 2. The inner wall surface of the tapered hole section 21 is a conical surface, and the generatrix of the inner wall surface of the tapered hole section 21 closest to the axis of the limiting plate 2 is parallel to the axis of the limiting plate 2, so that it is convenient for the steel strand 6 to pass through the tapered hole section 21 parallel to the axis of the limiting plate 2, and the steel strand 6 can be supported.

[0035] In other embodiments, when the outer anchoring surface of the working anchor plate is a conical anchoring surface, the outer limiting surface of the limiting wall surface can also be a limiting conical surface for limiting the wedge installed in the anchoring conical hole on the conical anchoring surface of the working anchor plate. At this time, a butt conical surface for adaptively butting against the conical anchoring surface on the working anchor plate is provided at the notch of the limiting groove.

[0036] In other embodiments, the through holes on the limiting plate are all holes with a constant diameter, and the corresponding steel strands change direction after passing through the through holes penetrating the limiting ball surface.

[0037] In other embodiments, the center line of the tapered hole section and the center line of the straight hole section can also be collinear, as long as the direction change of the steel strand is satisfied.

[0038] Embodiment of the limiting plate for tensioning of the prestressed tendon anchor of the present utility model:

[0039] The limiting plate for tensioning of the prestressed tendon anchor in this embodiment is the same as the limiting plate of the prestressed tendon anchor tensioning device of the present utility model described above, and will not be elaborated here.

[0040] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present 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 recorded in the foregoing embodiments without creative efforts, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Anchor stop for tensioning of prestressing tendons, characterized in that, The limiting plate is provided with a limiting wall surface, and the limiting wall surface includes a limiting conical surface portion for limiting the wedge-shaped clip installed in the anchoring conical hole on the conical anchoring surface of the anchor plate of the anchoring tool, or the limiting wall surface includes a limiting spherical surface portion for limiting the wedge-shaped clip installed in the anchoring conical hole on the spherical anchoring surface of the anchor plate of the anchoring tool.

2. The limited plate for tensioning the prestressing tendon anchor according to claim 1, characterized in that, A limiting groove is provided on the limiting plate, the limiting wall surface is arranged in the limiting groove, and a butt conical surface portion adapted to butt against the conical anchoring surface on the anchor plate or a butt spherical surface portion adapted to butt against the spherical anchoring surface on the anchor plate is provided at the notch of the limiting groove.

3. The limited plate for tensioning of the prestressed tendon anchor according to claim 1 or 2, characterized in that, A guiding through hole penetrating through the limiting conical surface portion or the limiting spherical surface portion is provided on the limiting plate, and the guiding through hole allows the corresponding cable to pass through the limiting plate. The guiding through hole includes a straight hole section and a conical hole section. The straight hole section has an orifice located on the limiting wall surface, and the conical hole section is arranged on the side of the straight hole section away from the limiting wall surface. The extension line of the center line of the straight hole section passes through the center line of the limiting conical surface portion or the center of the sphere where the limiting spherical surface portion is located.

4. The limited plate for tensioning of the prestressed tendon anchor described in claim 3, characterized in that, The center line of the conical hole section is arranged at an angle with the center line of the straight hole section.

5. The spacer plate for tensioning the prestressing tendon anchor according to claim 4, characterized in that, The generatrix of the inner wall surface of the conical hole section closest to the axis of the limiting plate is parallel to the axis of the limiting plate.

6. Prestressing tendon anchor tensioning equipment, characterized in that, It includes the limiting plate for tensioning the prestressed tendon anchor described in any one of the above claims 1-5.

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