High-strength prestressed tendon anchoring installation device and installation method

Abstract

The application discloses a high-strength prestressed tendon anchoring installation device and an installation method, and relates to the technical field of installation devices for prestressed tendons. The first end face of the formwork is provided with a positioning hole corresponding to the anchor hole of the wire separating plate, and the positioning hole is used for positioning the anchoring sleeve. The formwork box is of an open structure at one end, and the inner diameter of the open end is larger than the outer diameter of the formwork. One end of the positioning rod is installed in the interior of the formwork box, the other end penetrates through the formwork and extends out of the formwork box to be detachably connected with the wire separating plate. The formwork and the positioning rod are slidably connected along the axis of the positioning rod. The formwork box is also provided with a heating mechanism for heating the anchoring sleeve in the positioning hole. The high-strength prestressed tendon anchoring installation device and the installation method can simplify the processing technology, facilitate on-site production and installation, and have high installation efficiency.

Description

Technical Field

[0001] This invention relates to the field of prestressed tendon anchorage, and more particularly to a high-strength prestressed tendon anchorage installation device and installation method. Background Technology

[0002] Currently, commonly used cold-cast steel wire anchors use high-strength steel wire connected to a wire splitting plate at the large end of the tapered anchor cup via an upsetting head to ensure the divergence angle and arrangement of the wires. However, before the upsetting process, the wire splitting plate needs to be moved from the tail end of the steel wire towards the bend to provide sufficient working space for the wire end-cutting process. During the process of moving the wire splitting plate from the end with larger wire spacing to the end with smaller wire spacing, friction and scratches occur between the wire splitting hole and the surface of the steel wire, damaging the surface quality of the steel wire and adversely affecting its mechanical properties. The more steel wire bundles there are in the anchor, the greater the amount of wire splitting plate movement, the more complicated the installation, and the more obvious the damage to the steel wire.

[0003] To address the aforementioned deficiencies, existing technologies disclose some anchoring sleeves that are fitted onto the outer ring of prestressed tendons such as steel wires. The anchoring sleeves, in conjunction with wire-splitting plates or anchor plates, achieve the anchoring of the prestressed tendons. For example, Chinese patent CN115094754A discloses a CFRP cold-cast group anchor cable with an additional Fe-SMA sleeve and an anchoring method. This anchoring structure uses an Fe-SMA sleeve fitted on the prestressing tendon and a wire-separating plate to achieve anchoring. However, the Fe-SMA sleeve needs to be heated and installed using an anchoring agent and a curing oven during processing. Chinese patent CN209211275U discloses a novel parallel steel wire cold-cast anchor. This anchoring structure uses a fixing sleeve fitted on the steel wire for anchoring. The fixing sleeve and the steel wire are installed and fixed by an interference fit. Although the above-mentioned prior art does not require the prestressing tendon to be pierced and does not affect the structure and quality of the prestressing tendon, it requires a complex installation process to fix the anchor sleeve to the outer ring of the prestressing tendon. The installation efficiency of the anchoring structure is low, the reliability of the anchoring structure is poor, and the on-site fabrication and construction are difficult. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a high-strength prestressed tendon anchorage installation device and method, aiming to solve the problems of existing prestressed tendon anchorage structures requiring complex processing techniques to fit the anchor sleeve onto the outer ring of the prestressed tendon, resulting in low installation efficiency, poor reliability, and high difficulty in on-site fabrication and construction.

[0005] The present invention achieves the above objectives by adopting the following technical solutions:

[0006] A high-strength prestressed tendon anchoring installation device is disclosed for installing anchor sleeves onto the outer ring of prestressed tendons. The anchor sleeves are anchored to the end face of a wire-splitting plate. The installation device includes a template, a template box, and a positioning rod. The first end face of the template has a positioning hole corresponding to the anchor hole of the wire-splitting plate, which is used to position the anchor sleeve. The template box has an open end structure, with the inner diameter of the open end being larger than the outer diameter of the template. One end of the positioning rod is installed inside the template box, and the other end penetrates the template and extends out of the template box, detachably connecting to the wire-splitting plate. The template and the positioning rod are slidably connected along the axis of the positioning rod. The template box also includes a heating mechanism for heating the anchor sleeve in the positioning hole.

[0007] The working principle of this technical solution is as follows: A positioning hole template corresponding to the anchor hole of the wire-splitting plate is selected; an anchor sleeve matching the outer diameter of the prestressing tendon's tail end is selected, wherein the inner diameter of the anchor sleeve is smaller than the outer diameter of the prestressing tendon's tail end at room temperature, and larger than the outer diameter of the prestressing tendon's tail end when heated and expanded; a positioning rod enables a detachable connection between the template box and the wire-splitting plate, allowing the template to slide to the inside or outside of the template box. When the template slides to the inside of the template box, the heating mechanism of the template box heats the anchor sleeve in the positioning hole of the template, expanding the inner diameter of the anchor sleeve to fit over the outer ring of the prestressing tendon's tail end. When the template slides to the outside of the template box, the anchor sleeve is installed. The heated anchor sleeve is placed on the outer ring of the prestressing tendon tail end. After cooling, the inner diameter of the anchor sleeve shrinks and is fixed to the corresponding outer ring of the prestressing tendon tail end. The anchor sleeve in the template positioning hole of the template box is heated. The anchor sleeve is installed and fixed with the outer ring of the prestressing tendon tail end by means of thermal expansion and contraction. On the one hand, it replaces the prestressing tendon pier head structure and avoids the drawbacks of pier head treatment. On the other hand, the above installation device can simplify the processing technology, facilitate on-site fabrication and installation, and has high installation efficiency.

[0008] A further technical solution is that the positioning rod and the wire separating plate are detachably connected by one of the following: a threaded structure, a snap-fit ​​structure, or a magnetic structure.

[0009] A further technical solution includes an adjustment mechanism, which drives the template to slide back and forth along the positioning rod. In this technical solution, the adjustment mechanism can reciprocate and move the template, and make fine adjustments and corrections to prevent workers from being burned by high temperatures.

[0010] A further technical solution is that the adjustment mechanism includes an adjustment rod arranged parallel to the axis of the positioning rod. The adjustment rod includes a fixed end and a telescopic end. The fixed end is fixedly connected to the inner wall of the template box, and the telescopic end is fixedly connected to the second end face of the template.

[0011] A further technical solution is that the heating mechanism is a resistance wire heater.

[0012] A method for anchoring and installing high-strength prestressed tendons, comprising the above-mentioned installation device, wherein the installation method includes the following steps:

[0013] The tail end of the prestressing tendon passes through the anchor hole of the wire-splitting plate;

[0014] Select the template and anchor sleeve. Select the template with the positioning hole corresponding to the anchor hole of the wire splitting plate. Select the anchor sleeve that matches the outer diameter of the prestressing tendon tail end. The inner diameter of the anchor sleeve is smaller than the outer diameter of the prestressing tendon tail end under normal temperature conditions and larger than the outer diameter of the prestressing tendon tail end under heating and expansion conditions.

[0015] Install the template, place the template on the outer ring of the positioning rod, and install the anchor sleeve into the positioning hole;

[0016] The connection and positioning of the wire splitting plate are achieved by installing the positioning rod onto the wire splitting plate through a detachable structure, so that the positioning hole of the template corresponds to the anchor hole of the wire splitting plate.

[0017] Anchor sleeve heating: The template is slid along the positioning rod into the template box and heated to the preset temperature by the heating mechanism. The anchor sleeve expands due to heating, and its inner diameter is larger than the outer diameter of the prestressed tendon tail end.

[0018] For anchor sleeve installation, slide the template heated to the preset temperature along the positioning rod to the end face of the wire splitting plate, so that the anchor sleeve is fitted onto the outer ring of the tail end of the prestressing tendon.

[0019] The anchor sleeve is cooled to room temperature, and the inner diameter of the anchor sleeve shrinks and is fixedly connected to the outer ring at the tail end of the prestressing tendon.

[0020] Remove the template box, and the positioning rod is detached from the wire splitting plate via a detachable structure.

[0021] The beneficial effects of this invention are:

[0022] This invention provides a high-strength prestressed tendon anchorage installation device and installation method. The anchorage sleeve is installed and fixed with the outer ring at the tail end of the prestressed tendon by means of thermal expansion and contraction. On the one hand, it replaces the prestressed tendon pier head structure and avoids the drawbacks of pier head treatment. On the other hand, the above-mentioned installation device can simplify the processing technology, facilitate on-site fabrication and installation, and has high installation efficiency. Attached Figure Description

[0023] Figure 1 See: A schematic diagram of the structure of the template described in this invention.

[0024] Figure 2 See: A schematic diagram of the structure of the installation device before installation according to the present invention.

[0025] Figure 3 See: A structural diagram of the installation process of the installation device described in this invention.

[0026] Figure 4 See: A schematic diagram of the installation device after installation according to the present invention.

[0027] Figure 5 See: A schematic diagram of the structure for removing the installation device described in this invention.

[0028] In the picture:

[0029] 1. Prestressed tendon; 2. Anchor sleeve; 3. Wire separator plate; 41. Template; 410. Positioning hole; 411. Through hole; 42. Template box; 43. Positioning rod; 441. First adjusting rod; 442. Second adjusting rod; 5. Anchor cup; 6. Constraint ring. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1 to 5 The present invention will be described in detail below with reference to specific embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] like Figures 1 to 5 As shown, this embodiment provides a high-strength prestressed tendon anchoring installation device for installing an anchor sleeve 2 on the outer ring of the prestressed tendon 1. The anchor sleeve 2 is anchored to the end face of the wire-splitting plate 3. Specifically, the prestressed tendon 1 passes through the constraint ring 6, diverges in the conical hole of the anchor cup 5, and passes through the wire-splitting hole of the wire-splitting plate 3. The tail end of the prestressed tendon 1 is connected to the anchor sleeve 2, and one end face of the anchor sleeve 2 presses against the end face of the wire-splitting plate 3. The installation device includes a template 41, a template box 42, and a positioning rod 43. The first end face of the template 41 is provided with a positioning hole 410 corresponding to the anchor hole of the wire-splitting plate 3. The positioning hole 410 is used to position the anchor sleeve 2. The template box 42 is an open structure at one end, and the inner diameter of the open end is larger than the outer diameter of the template 41. One end of the positioning rod 43 is installed inside the template box 42, and the other end passes through the template 41 and extends out of the template box 42 to connect with the wire-splitting plate 3. The wire plate 3 is detachably connected; the template 41 and the positioning rod 43 are slidably connected along the axis of the positioning rod 43; the template box 42 is also provided with a heating mechanism for heating the anchor sleeve 2 in the positioning hole 410; in this embodiment, one end of the positioning rod 43 is installed on the inner wall of the template box 42 opposite to the open end, and can be integrally formed, welded, threaded, snap-fit, magnetic or tenon joint, etc. The template 41 is provided with a positioning hole 410 (i.e. the first end) opposite to the wire plate 3, and the template 41 is provided with a through hole 411 that is clearance-fitted with the positioning rod 43, which facilitates the sliding of the template 41 along the positioning rod 43 and improves the installation stability. The positioning rod 43 and the wire plate 3 are vertically connected by a threaded structure. The end of the template box 42 near the wire plate 3 is the open end. The heating mechanism is a resistance wire heater fixed inside the template box 42. The prestressing tendon 1 can be steel wire, steel strand or carbon fiber tendon, etc.

[0032] The working principle of this embodiment is as follows: Before installation, the tail end of the prestressing tendon 1 passes through the wire-splitting plate 3. A positioning hole 410 template 41 corresponding to the anchor hole of the wire-splitting plate 3 is selected. An anchor sleeve 2 that matches the outer diameter of the tail end of the prestressing tendon 1 is selected. The inner diameter of the anchor sleeve 2 is smaller than the outer diameter of the tail end of the prestressing tendon 1 at room temperature, and larger than the outer diameter of the tail end of the prestressing tendon 1 under heating and expansion conditions. The template box 42 and the wire-splitting plate 3 are detachably connected by the positioning rod 43. The template 41 can slide to the inside or outside of the template box 42. When the template 41 slides to the inside of the template box 42, the heating mechanism of the template box 42 heats the anchor sleeve 2 in the positioning hole 410 of the template 41, so that the inner diameter of the anchor sleeve 2 expands to be able to fit on the tail end of the prestressing tendon 1. When the template 41 slides to the outside of the template box 42, the anchor sleeve 2 is installed. The heated anchor sleeve 2 is fitted onto the outer ring of the tail end of the prestressing tendon 1. After cooling, the inner diameter of the anchor sleeve 2 shrinks and is fixed to the corresponding outer ring of the tail end of the prestressing tendon 1. The template 41 can be installed manually with a push-pull tool or by the adjustment mechanism described in the following embodiments. In this embodiment, the anchor sleeve 2 is installed and fixed to the outer ring of the tail end of the prestressing tendon 1 by means of thermal expansion and contraction. On the one hand, it replaces the pier head structure of the prestressing tendon 1, avoiding the drawbacks of pier head treatment. On the other hand, the above installation device can simplify the processing technology, facilitate on-site fabrication and installation, and has high installation efficiency.

[0033] This embodiment exemplarily illustrates the specific connection method and connection position between the positioning rod 43 and the wire-splitting plate 3. In other embodiments or practical applications, other methods can be used instead. For example, the positioning rod 43 can also be detachably connected to the wire-splitting plate 3 through snap-fit, magnetic attraction, tenon and mortise, etc. In addition, in some working conditions with insufficient axial space, the positioning rod 43 can also be detachably connected to the wire-splitting plate 3 in an inclined manner. The fitting can be achieved by finely adjusting the docking angle between the tail end of the prestressing tendon 1 and the anchor sleeve 2, or by using a method in which the front section is inclined and the rear section is perpendicular to the wire-splitting plate, etc.

[0034] In another embodiment, based on the above embodiment, the installation device further includes an adjustment mechanism. The adjustment mechanism is used to drive the template to slide back and forth along the positioning rod. Specifically, it includes a first adjustment rod 441 and a second adjustment rod 442. The first adjustment rod 441 and the second adjustment rod 442 respectively include a fixed end and a telescopic end. The fixed end is fixedly connected to the inner wall of the template box 42, and the telescopic end is fixedly connected to the second end face of the template 41. The second end of the template 41 is the end away from the wire splitting plate 3. The first adjusting rod 441 and the second adjusting rod 442 can be specifically designed as sleeve structures, which can be achieved manually with the help of push-pull tools, thereby improving the stability of the sliding of the template 41 and thus improving the installation efficiency. Alternatively, a gear and rack combination or a screw and nut combination can be used to achieve unmanned adjustment. One end of the rack is fixed to the second end face of the template 41 and is arranged parallel to the axis of the positioning rod 43. The gear is connected to the rotor of the servo motor installed in the template box 42, and the gear meshes with the rack. When the servo motor drives the gear to rotate, it can drive the rack to slide along the axis of the positioning rod 43, that is, drive the template 41 to slide back and forth along the positioning rod 43. Another specific method is that the screw is connected to the rotor of the servo motor and is arranged parallel to the axis of the positioning rod 43. The nut is fixed to the template 41 and is threadedly engaged with the screw. When the servo motor drives the screw to rotate, the nut drives the template 41 to slide back and forth along the positioning rod 43. In addition, other telescopic and adjustable mechanisms in the prior art can also be used to achieve the reciprocating sliding of the template 41 along the positioning rod 43, which will not be elaborated here. The aforementioned adjustment mechanism can reciprocate and push the template 41, and make fine adjustments and corrections to avoid burns to workers caused by high temperatures. At the same time, the adjustment mechanism limits the sliding path of the template 41 during installation, so the through hole 411 of the template 41 does not need to be fitted with the positioning rod 43 with a clearance.

[0035] Another implementation, such as Figures 1 to 5 As shown, based on the above embodiments, a method for anchoring and installing high-strength prestressed tendons is provided, including the following steps:

[0036] A) The tail end of the prestressed tendon 1 passes through the anchor hole of the wire-splitting plate 3;

[0037] B) Select template 41 and anchor sleeve 2. Select template 41 with positioning hole 410 corresponding to anchor hole of wire splitting plate 3. Select anchor sleeve 2 that matches the outer diameter of the tail end of prestressing tendon 1. The inner diameter of anchor sleeve 2 is smaller than the outer diameter of the tail end of prestressing tendon 1 under normal temperature condition and larger than the outer diameter of the tail end of prestressing tendon 1 under heated expansion condition.

[0038] C) Install template 41, place template 41 on the outer ring of positioning rod 43, and install anchor sleeve 2 into positioning hole 410;

[0039] D) Connection and positioning of the wire splitting plate 3: The positioning rod 43 is installed to the wire splitting plate 3 through a detachable structure, so that the positioning hole 410 of the template 41 corresponds to the anchor hole of the wire splitting plate 3.

[0040] E) Heating of anchor sleeve 2: The template 41 is slid along the positioning rod 43 into the template box 42 and heated to the preset temperature by the heating mechanism. The anchor sleeve 2 expands due to heating, and its inner diameter is larger than the outer diameter of the tail end of the prestressing tendon 1. The heating temperature and heating time can be set according to the material of the anchor sleeve 2 and the heating mechanism.

[0041] F) Installation of anchor sleeve 2: The template 41, heated to the preset temperature, is slid along the positioning rod 42 to the end face of the wire splitting plate 3, so that the anchor sleeve 2 is fitted onto the outer ring of the tail end of the prestressed tendon 1.

[0042] G) Anchor sleeve 2 is cooled to room temperature. The inner diameter of anchor sleeve 2 shrinks and is fixedly connected to the outer ring at the tail end of prestressed tendon 1.

[0043] H) Remove the template box 42, and the positioning rod 43 is detached from the wire-splitting plate 3 through the detachable structure, thus completing the installation of the anchor sleeve 2.

[0044] The present invention provides a high-strength prestressed tendon anchoring installation device and installation method. The anchoring sleeve 2 is installed and fixed with the outer ring of the tail end of the prestressed tendon 1 by means of thermal expansion and contraction. On the one hand, it replaces the prestressed tendon pier head structure and avoids the drawbacks of pier head treatment. On the other hand, the above-mentioned installation device can simplify the processing technology, facilitate on-site fabrication and installation, and has high installation efficiency.

Claims

1. A method for anchoring and installing high-strength prestressed tendons, characterized in that, The device includes a high-strength prestressed tendon anchoring installation device. The device is used to install an anchor sleeve onto the outer ring of the prestressed tendon. The anchor sleeve is anchored to the end face of a wire-splitting plate. The installation device includes a template, a template box, and a positioning rod. The first end face of the template has a positioning hole corresponding to the anchor hole of the wire-splitting plate, and the positioning hole is used to position the anchor sleeve. The template box has an open end structure, with the inner diameter of the open end being larger than the outer diameter of the template. One end of the positioning rod is installed inside the template box, and the other end passes through the template and extends out of the template box to be detachably connected to the wire splitting plate; the template and the positioning rod are slidably connected along the axis of the positioning rod; the template box is also equipped with a heating mechanism for heating the anchor sleeve in the positioning hole; The installation method includes the following steps: The tail end of the prestressing tendon passes through the anchor hole of the wire-splitting plate; Select the template and anchor sleeve. Select the template with the positioning hole corresponding to the anchor hole of the wire splitting plate. Select the anchor sleeve that matches the outer diameter of the prestressing tendon tail end. The inner diameter of the anchor sleeve is smaller than the outer diameter of the prestressing tendon tail end under normal temperature conditions and larger than the outer diameter of the prestressing tendon tail end under heating and expansion conditions. Install the template, place the template on the outer ring of the positioning rod, and install the anchor sleeve into the positioning hole; The connection and positioning of the wire splitting plate are achieved by installing the positioning rod onto the wire splitting plate through a detachable structure, so that the positioning hole of the template corresponds to the anchor hole of the wire splitting plate. Anchor sleeve heating: The template is slid along the positioning rod into the template box and heated to the preset temperature by the heating mechanism. The anchor sleeve expands due to heating, and its inner diameter is larger than the outer diameter of the prestressed tendon tail end. For anchor sleeve installation, slide the template heated to the preset temperature along the positioning rod to the end face of the wire splitting plate, so that the anchor sleeve is fitted onto the outer ring of the tail end of the prestressing tendon; The anchor sleeve is cooled to room temperature, and the inner diameter of the anchor sleeve shrinks and is fixedly connected to the outer ring at the tail end of the prestressing tendon. Remove the template box, and the positioning rod is detached from the wire splitting plate via a detachable structure.

2. The high-strength prestressed tendon anchorage installation method according to claim 1, characterized in that, The positioning rod and the wire splitting plate are detachably connected by one of the following: a threaded structure, a snap-fit ​​structure, or a magnetic structure.

3. The high-strength prestressed tendon anchorage installation method according to claim 1, characterized in that, It also includes an adjustment mechanism, which is used to drive the template to slide back and forth along the positioning rod.

4. The high-strength prestressed tendon anchorage installation method according to claim 3, characterized in that, The adjustment mechanism includes an adjustment rod arranged parallel to the axis of the positioning rod. The adjustment rod includes a fixed end and a telescopic end. The fixed end is fixedly connected to the inner wall of the template box, and the telescopic end is fixedly connected to the second end face of the template.

5. The high-strength prestressed tendon anchorage installation method according to claim 1, characterized in that, The heating mechanism is a resistance wire heater.

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