A single-hole anchor tensioning auxiliary device

Abstract

The present invention discloses a single-hole anchor tensioning auxiliary device, which includes an outer sleeve and an inner sleeve sleeved together. The inner sleeve is fixed relative to the outer sleeve, and one end of the inner sleeve is misaligned with the end face of the outer sleeve. At the misaligned end, a limiting cavity for accommodating the anchor is formed between the inner wall of the outer sleeve and the end face of the inner sleeve. An elastic limiting member is arranged inside the inner sleeve, and a through hole for passing through the steel strand is arranged on the elastic limiting member. The elastic limiting member is used to limit the displacement of the working wedge block retracting into the inner sleeve during tensioning. The pressure of the jack is transmitted to the cross beam where the anchor acts through the outer sleeve. The limiting cavity formed by the inner sleeve and the outer sleeve restricts the movement of the anchor in a small space, and the elastic limiting member effectively restricts the withdrawal amount of the working wedge block. Moreover, this device is light in weight, small in size and easy to operate, can avoid damage to the steel strand and the working wedge block, and does not require manual knocking of the withdrawn working wedge block into the anchor, which is beneficial to reducing the tensioning safety risk.

Description

Technical Field

[0001] The present invention relates to the tensioning technology of single-hole anchors, and specifically to an auxiliary device for tensioning single-hole anchors. Background Art

[0002] In the traditional tensioning process of single-hole anchors, the single-hole anchor tensioning jack directly acts on the anchor. When the oil is fed in, the limit plate of the jack restricts the working wedge jaws from withdrawing. There is a round hole in the limit plate for the working wedge jaws to withdraw, so that the working wedge jaws have a certain space to withdraw and can withdraw a certain length. When the oil is returned, the steel strand drives the working wedge jaws to retract, and the steel strand is anchored to the anchor through the working wedge jaws. When the single-hole anchor jack is tensioning, the round hole in the limit plate needs to be aligned with the working wedge jaws, so that the working wedge jaws can freely withdraw and retract during the tensioning process. If not aligned, the working wedge jaws cannot withdraw, which will damage the working wedge jaws and the steel strand, and in severe cases, the steel strand will be broken.

[0003] To avoid the above problems, a simple improvement is to make a square bench with steel plates and sections. There is a hole in the middle of the bench for the steel strand to pass through. A certain space needs to be reserved between the four feet of the bench. During the tensioning process, the withdrawn working wedge jaws need to be knocked into the anchor in time to clamp the steel strand. Since the bench needs to have a certain strength to bear the pressure of the jack and a relatively large space needs to be reserved to knock the working wedge jaws, the bench for tensioning is generally large and heavy and is only applicable when the bench can be stabilized. When tensioning the stay cables of a concrete-filled steel tube arch bridge, the tensioning end tensioning angle is obliquely downward. When using a bench for auxiliary tensioning, special personnel are required to assist in positioning the bench, and there are relatively large safety risks during the tensioning process, and the operation is very difficult. Summary of the Invention

[0004] The object of the present invention is to provide an auxiliary device for tensioning single-hole anchors. After using this device, the jack will not directly act on the anchor for tensioning, which can avoid damaging the working wedge jaws and the steel strand. At the same time, it is no longer necessary to use a bench for auxiliary tensioning, which is beneficial to reducing the safety risks during the tensioning process and no longer requires manual knocking of the working wedge jaws. This is aimed at the problem that in the current tensioning of single-hole anchors, the single-hole anchor tensioning jack directly acts on the anchor for tensioning, which is easy to damage the working wedge jaws and the steel strand, and when using a bench for auxiliary tensioning, special personnel are required to assist in positioning the bench, and there are relatively large safety risks during the tensioning process, and the operation is very difficult.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A single-hole anchor tensioning auxiliary device includes an outer sleeve and an inner sleeve sleeved together. The inner sleeve is fixed relative to the outer sleeve, and one end of the inner sleeve is misaligned with the end face of the outer sleeve. At the misaligned end, a limiting cavity for accommodating the anchor is formed between the inner wall of the outer sleeve and the end face of the inner sleeve. An elastic limiting member is arranged inside the inner sleeve, and a through hole for passing through the steel strand is arranged on the elastic limiting member. The elastic limiting member is used to limit the displacement of the working wedge block retracting into the inner sleeve during tensioning.

[0007] In the present invention, the pressure of the jack during the tensioning process is transmitted to the cross beam where the anchor acts through the outer sleeve. The limiting cavity formed by the inner sleeve and the outer sleeve restricts the movement of the anchor in a small space, and the elastic limiting member effectively restricts the withdrawal amount of the working wedge block. Moreover, the device is light in weight, small in volume, and easy to operate, which can avoid damage to the steel strand and the working wedge block. During tensioning, it is no longer necessary to manually knock the withdrawn working wedge block into the anchor, which is beneficial to reducing the safety risk during the tensioning process.

[0008] As a preferred solution of the present invention, the elastic limiting member is a compression spring coaxially arranged with the inner sleeve, and one end of the compression spring that does not contact the working wedge block is fixed relative to the inner sleeve. By arranging a compression spring inside the inner sleeve and fixing one end of the compression spring, during the tensioning process, when the working wedge block withdraws, the spring will be compressed, effectively restricting the withdrawal amount of the working wedge block, and there is no need to manually knock the withdrawn working wedge block into the anchor.

[0009] As a preferred solution of the present invention, a support tube for fixing the compression spring is further arranged inside the inner sleeve, and a conical section matching the inner ring of the compression spring is arranged on the support tube. By arranging a support tube inside the inner sleeve and arranging a conical section on the support tube to match the inner ring of the compression spring, the axial limit of the compression spring on the support tube is realized.

[0010] As a preferred solution of the present invention, a connecting tube is further sleeved inside the outer sleeve. The connecting tube is fixed relative to the outer sleeve, and the end face of the inner sleeve is fixedly connected to the end face of the connecting tube. By arranging the connecting tube to be connected to the inner sleeve, when the thickness of the anchor is greater than the depth of the limiting cavity, the outer sleeve cannot transmit the pressure of the jack during the tensioning process to the cross beam where the anchor acts. Then, the pressure of the jack can be transmitted to the cross beam through the contact between the end face of the inner sleeve and the end face of the anchor, expanding the application range of the device.

[0011] As a preferred solution of the present invention, a transition tube is further sleeved inside the connecting tube. The transition tube is fixed relative to the connecting tube, and one end of the support tube away from the compression spring is sleeved inside the transition tube. By arranging the transition tube, it is used to realize the fixation of the support tube, and further realize the installation of the compression spring, and can transmit the pressure received by the compression spring to the connecting tube.

[0012] As a preferred embodiment of the present invention, a thread pair is further provided between the inner wall of the connecting pipe and the outer wall of the transition pipe, which is convenient for adjusting the extending length of the transition pipe during device manufacturing and can bear axial force at the same time.

[0013] As a preferred embodiment of the present invention, a thread pair is further provided between the inner wall of the transition pipe and the outer wall of the support pipe, which is convenient for adjusting the extending length of the support pipe during device manufacturing and can bear axial force at the same time.

[0014] As a preferred embodiment of the present invention, a bearing plate is provided at one end of the outer sleeve away from the limiting cavity, and through holes capable of passing through the steel strand are correspondingly formed on the bearing plate. By providing the bearing plate, it is convenient to contact with the tensioning jack and realize the pressure transmission of the jack.

[0015] As a preferred embodiment of the present invention, observation holes are correspondingly formed on the side walls of the outer sleeve and the inner sleeve, and the observation holes are used to observe the withdrawal condition of the working wedge-shaped grip during the tensioning process.

[0016] As a preferred embodiment of the present invention, the observation hole is a long strip hole arranged along the movement direction of the working wedge-shaped grip.

[0017] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0018] 1. In the present invention, the pressure of the jack during the tensioning process is transmitted to the cross beam where the anchor is located through the outer sleeve. The limiting cavity formed by the inner sleeve and the outer sleeve restricts the movement of the anchor in a small space, and the elastic limiting member effectively restricts the withdrawal amount of the working wedge-shaped grip. Moreover, the device is light in weight, small in volume, and easy to operate, which can avoid damage to the steel strand and the working wedge-shaped grip, and there is no need to manually knock the withdrawn working wedge-shaped grip into the anchor during tensioning, which is beneficial to reducing the safety risk during the tensioning process;

[0019] 2. By arranging a compression spring inside the inner sleeve and fixing one end of the compression spring, when the working wedge-shaped grip withdraws during the tensioning process, the spring will be compressed, effectively restricting the withdrawal amount of the working wedge-shaped grip, and there is no need to manually knock the withdrawn working wedge-shaped grip into the anchor;

[0020] 3. By arranging a support pipe inside the inner sleeve and providing a conical section on the support pipe to cooperate with the inner ring of the compression spring, the axial limit of the compression spring on the support pipe is realized;

[0021] 4. By arranging a connecting pipe to be connected with the inner sleeve, when the thickness of the anchor is greater than the depth of the limiting cavity, the outer sleeve cannot transmit the pressure of the jack during the tensioning process to the cross beam where the anchor is located. Then, the end face of the inner sleeve can be in contact with the end face of the anchor, so as to transmit the jack pressure to the cross beam, expanding the application range of the device. Description of the Drawings

[0022] Figure 1 Schematic diagram of the single-hole anchor tensioning auxiliary device in the present invention.

[0023] Figure 2 Schematic diagram of the usage state of the single-hole anchor tensioning auxiliary device in the present invention.

[0024] Markings in the figure: 1 - outer sleeve, 2 - inner sleeve, 3 - bearing plate, 4 - connecting pipe, 5 - transition pipe, 6 - support pipe, 7 - elastic limiting member, 8 - observation hole, 9 - anchor, 10 - cross beam, 11 - working wedge, 12 - steel strand, 13 - jack. Specific embodiments

[0025] The present invention will be described in detail below with reference to the accompanying drawings.

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Embodiment

[0028] This embodiment provides a single-hole anchor tensioning auxiliary device;

[0029] As Figure 1 and Figure 2 shown, the single-hole anchor tensioning auxiliary device in this embodiment includes an outer sleeve 1 and an inner sleeve 2 sleeved together. The inner sleeve 2 is fixed relative to the outer sleeve 1, and one end of the inner sleeve 2 is misaligned with the end face of the outer sleeve 1. At the misaligned end, a limiting cavity for accommodating the anchor 9 is formed between the inner wall of the outer sleeve 1 and the end face of the inner sleeve 2. An elastic limiting member 7 is provided inside the inner sleeve 2, and a through hole capable of passing through the steel strand 12 is provided on the elastic limiting member 7. The elastic limiting member 7 is used to limit the displacement amount of the working wedge 11 retracting into the inner sleeve 2 during tensioning.

[0030] The present invention transmits the pressure of the jack 13 during the tensioning process to the cross beam 10 where the anchor 9 acts through the outer sleeve 1, restricts the movement of the anchor 9 in a small space through the limiting cavity formed by the inner sleeve 2 and the outer sleeve 1, and effectively restricts the withdrawal amount of the working wedge 11 by using the elastic limiting member 7. Moreover, this device is light in weight, small in volume, and easy to operate, which can avoid damaging the steel strand 12 and the working wedge 11. During tensioning, it is no longer necessary to manually knock the retracted working wedge 11 into the anchor 9, which is beneficial to reducing the safety risk during the tensioning process.

[0031] In this embodiment, the length of the outer sleeve 1 is greater than that of the inner sleeve 2. The inner diameter of the outer sleeve 1 is adapted to the outer circle of the anchor 9. The depth of the limiting cavity is slightly greater than the thickness of the anchor 9, so that the inner wall of the outer sleeve 1 can limit the outer circle of the anchor 9 during tensioning. At the same time, there is a certain clearance between the end face of the inner sleeve 2 and the end face of the anchor 9. The outer diameter of the inner sleeve 2 is slightly smaller than the inner diameter of the outer sleeve 1, and the inner diameter of the inner sleeve 2 is larger than the large end diameter of the working wedge 11, so that the working wedge 11 can retract into the inner sleeve 2 during tensioning.

[0032] In this embodiment, the elastic limiting member 7 is a compression spring coaxially arranged with the inner sleeve 2, and the end of the compression spring that does not contact the working wedge 11 is fixed relative to the inner sleeve 2. In the natural state, the free end of the compression spring is flush with the end of the inner sleeve 2. By arranging a compression spring in the inner sleeve 2 and fixing one end of the compression spring, the spring will be compressed when the working wedge 11 retracts during the tensioning process, effectively limiting the retraction amount of the working wedge 11, and there is no need to manually knock the retracted working wedge 11 into the anchor 9. During tensioning, in order for the working wedge 11 to better compress the compression spring, the radial dimensions of the end face of the compression spring and the large end of the working wedge 11 are adapted, so that the large end of the working wedge 11 can be in good contact with the end face of the compression spring.

[0033] In this embodiment, a support tube 6 for fixing the compression spring is further arranged in the inner sleeve 2, and a conical section matching the inner ring of the compression spring is arranged on the support tube 6. By arranging the support tube 6 in the inner sleeve 2 and arranging a conical section on the support tube 6 to match the inner ring of the compression spring, the axial limit of the compression spring on the support tube 6 is realized.

[0034] In this embodiment, a connecting tube 4 is further sleeved in the outer sleeve 1. The connecting tube 4 is fixed relative to the outer sleeve 1, and the end face of the inner sleeve 2 is fixedly connected to the connecting tube 4. By arranging the connecting tube 4 to be connected to the inner sleeve 2, when the thickness of the anchor 9 is greater than the depth of the limiting cavity, the outer sleeve 1 cannot transmit the pressure of the jack 13 during the tensioning process to the cross beam 10 where the anchor 9 acts. Then, the pressure of the jack 13 can be transmitted to the cross beam 10 through the contact between the end face of the inner sleeve 2 and the end face of the anchor 9, expanding the application range of the device. The outer diameter of the connecting tube 4 is adapted to the inner diameter of the outer sleeve 1, the inner diameter of the connecting tube 4 is smaller than the inner diameter of the inner sleeve 2, and the end of the connecting tube 4 opposite to the inner sleeve 2 is flush with the end face of the outer sleeve 1.

[0035] In this embodiment, a transition pipe 5 is further sleeved inside the connecting pipe 4. The transition pipe 5 is fixed relative to the connecting pipe 4, and one end of the support pipe 6 away from the compression spring is sleeved inside the transition pipe 5. By providing the transition pipe 5, it is used to fix the support pipe 6, thereby realizing the installation of the compression spring, and the pressure received by the compression spring can be transmitted to the connecting pipe 4. The outer diameter of the transition pipe 5 is adapted to the inner diameter of the connecting pipe 4, the inner diameter of the transition pipe 5 is adapted to the outer diameter of the support pipe 6, and one end of the transition pipe 5 connected to the support pipe 6 extends beyond the end face of the connecting pipe 4, while the other end of the transition pipe 5 is retracted relative to the other end of the connecting pipe 4.

[0036] In this embodiment, a thread pair is further provided between the inner wall of the connecting pipe 4 and the outer wall of the transition pipe 5, which is convenient for adjusting the extending length of the transition pipe 5 during the manufacture of the device and can bear axial force at the same time.

[0037] In this embodiment, a thread pair is further provided between the inner wall of the transition pipe 5 and the outer wall of the support pipe 6, which is convenient for adjusting the extending length of the support pipe 6 during the manufacture of the device and can bear axial force at the same time.

[0038] In this embodiment, a bearing plate 3 is provided at one end of the outer sleeve 1 away from the limiting cavity, and a through hole capable of passing through the steel strand 12 is correspondingly opened on the bearing plate 3. By providing the bearing plate 3, it is convenient to contact with the tensioning jack 13 and realize the pressure transmission of the jack 13.

[0039] In this embodiment, observation holes 8 are correspondingly opened on the side walls of the outer sleeve 1 and the inner sleeve 2, and the observation holes 8 are used to observe the withdrawal condition of the working wedge 11 during the tensioning process.

[0040] In this embodiment, the observation hole 8 is a long strip hole arranged along the movement direction of the working wedge 11.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A single-hole anchor tensioning auxiliary device, characterized in that, It includes an outer sleeve and an inner sleeve sleeved together. The inner sleeve is fixed in position relative to the outer sleeve, and one end of the inner sleeve is misaligned with the end face of the outer sleeve. At the misaligned end, a limiting cavity for accommodating the anchor is formed between the inner wall of the outer sleeve and the end face of the inner sleeve. The inner diameter of the inner sleeve is larger than the large-end diameter of the working wedge, so that the working wedge can retract into the inner sleeve during tensioning. An elastic limiting member is provided in the inner sleeve. The elastic limiting member is provided with a through hole through which the steel strand can pass. The elastic limiting member is used to limit the displacement of the working wedge retracting into the inner sleeve during tensioning. The elastic limiting member is a compression spring coaxially arranged with the inner sleeve. One end of the compression spring that does not contact the working wedge is fixed in position relative to the inner sleeve, and the end face of the compression spring is adapted to the radial dimension of the large end of the working wedge. A connecting pipe is also sleeved in the outer sleeve. The connecting pipe is fixed in position relative to the outer sleeve. The end face of the inner sleeve is fixedly connected to the end face of the connecting pipe, and can contact the end face of the anchor through the end face of the inner sleeve. A support pipe for fixing the compression spring is also provided in the inner sleeve. The support pipe is provided with a conical section that matches the inner ring of the compression spring. A transition pipe is also sleeved in the connecting pipe. The transition pipe is fixed in position relative to the connecting pipe. One end of the support pipe away from the compression spring is sleeved in the transition pipe. A thread pair is also provided between the inner wall of the connecting pipe and the outer wall of the transition pipe. A thread pair is also provided between the inner wall of the transition pipe and the outer wall of the support pipe. A bearing plate is provided at one end of the outer sleeve away from the limiting cavity. Through holes through which the steel strand can pass are correspondingly provided on the bearing plate.

2. The single-hole anchor tensioning auxiliary device according to claim 1, characterized in that Observation holes are correspondingly provided on the side walls of the outer sleeve and the inner sleeve. The observation holes are used to observe the withdrawal situation of the working wedge during tensioning.

3. The single-hole anchor tensioning auxiliary device according to claim 2, characterized in that, The observation holes are long strip-shaped holes arranged along the movement direction of the working wedge.

Images