Self-unlocking post-tensioned prestressed cable and construction method thereof

Abstract

The application provides a self-unlocking post-tensioned prestressed cable and a construction method thereof, which comprises an exposed end anchoring structure, a prestressed pipeline located underground, an inbuilt end anchoring structure, an anchoring sleeve and a prestressed steel beam. The inbuilt end anchoring structure comprises an anchor plate and a tooth-shaped anchoring buckle at the outer edge of the anchor plate; a plurality of prestressed steel beam holes are arranged in the middle of the anchor plate, and the prestressed steel beam is clamped in the anchor plate by a clamping piece. The anchoring sleeve comprises a guide section, an anchoring pressure bearing section, an unlocking guide rail section and a locking guide rail section; a movable unlocking guide rail in the shape of a slope leading to an unlocking groove is arranged at the bottom of the locking groove. A fixed locking guide rail in the shape of a slope leading to a locking groove is arranged at the bottom of the unlocking groove. The application has the advantages of simple structure, low cost, reusable prestressed steel beam and inbuilt end anchoring structure and obvious economic benefits. During construction, a tensioning construction operation surface does not need to be arranged underground, the construction is convenient, and the application problem of the prestressed cable in underground engineering is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underground engineering, and particularly relates to a self-unlocking post-tensioned prestressed anchor cable and a construction method thereof. BACKGROUND

[0002] Prestress is generally applied in bridge engineering, but is rarely applied in underground structure, especially underground engineering enclosure structure, mainly because of the particularity of underground structure buried in underground rock-soil body, and no prestress tensioning operation surface at the underground end. SUMMARY

[0003] The application aims to provide a self-unlocking post-tensioned prestressed anchor cable and a construction method thereof, which can solve the application problem of prestressed anchor cable in underground engineering.

[0004] The application is implemented as follows: a self-unlocking post-tensioned prestressed anchor cable comprises an exposed end anchoring structure, a prestressed pipeline, an embedded end anchoring structure, an anchoring sleeve and a prestressed steel strand; the prestressed pipeline, the embedded end anchoring structure, the anchoring sleeve and the prestressed steel strand are all located in an underground structure.

[0005] The embedded end anchoring structure comprises an anchor plate and a tooth-shaped anchoring buckle arranged at the outer edge of the anchor plate; the middle part of the anchor plate is provided with a plurality of prestressed steel strand holes, the prestressed steel strand holes are tapered with the upper part being small and the lower part being large, and the hole wall of the prestressed steel strand hole is provided with a clamping piece; during anchoring, the prestressed steel strand is clamped in the anchor plate through the clamping piece.

[0006] The anchoring sleeve comprises a guide section, an anchoring pressure bearing section, an unlocking guide rail section and a locking guide rail section.

[0007] The guide section comprises a prestressed pipeline connecting steel cylinder, a guide section steel cylinder and a wedge-shaped guide steel sheet; the inner diameter of the prestressed pipeline connecting steel cylinder is consistent with the outer diameter of the prestressed pipeline.

[0008] The outer sides of the anchoring pressure bearing section, the unlocking guide rail section and the locking guide rail section are all provided with steel cylinders.

[0009] The inner side of the steel cylinder of the anchoring pressure bearing section is further provided with a tooth-shaped anchoring pressure bearing buckle; the steel cylinder of the anchoring pressure bearing section is internally provided with an anchor insertion / unlocking channel of the embedded end anchoring structure, and the size of the anchor insertion / unlocking channel is slightly larger than the cross-sectional shape of the embedded end anchoring structure.

[0010] The wedge-shaped guide steel sheet of the guide section is located above the tooth-shaped anchoring pressure bearing buckle of the anchoring pressure bearing section, so as to ensure that the anchor insertion / unlocking channel is unobstructed.

[0011] The unlocking guide rail section and the locking guide rail section are internally provided with vertical partition plates, the cross-sectional position of which is located at the edge of the tooth-shaped anchoring pressure socket, the vertical partition plates divide the inner part of the anchoring sleeve into a locking groove and an unlocking groove, the top of the locking groove is the tooth-shaped anchoring pressure socket, and the rest is the unlocking groove;

[0012] The unlocking guide rail section is provided with a movable unlocking guide rail at the bottom of the locking groove, the movable unlocking guide rail is in a slope shape and leads to the unlocking groove, the top of the movable unlocking guide rail is not connected with the vertical partition plate, the bottom of the movable unlocking guide rail is a movable hinge with a limited rotation angle, so that the top of the movable unlocking guide rail cannot fall into the unlocking groove when the movable unlocking guide rail is moved, the vertical partition plate where the bottom of the movable unlocking guide rail is located has a first opening, the bottom of the first opening is flush with the bottom of the movable unlocking guide rail, and the height of the first opening is not less than the height of the built-in end anchoring structure;

[0013] The locking guide rail section is provided with a fixed locking guide rail at the bottom of the unlocking groove, the fixed locking guide rail is in a slope shape and leads to the locking groove, the vertical partition plate where the bottom of the fixed locking guide rail is located has a second opening, the bottom of the second opening is flush with the bottom of the fixed unlocking guide rail, and the height of the second opening is not less than the height of the built-in end anchoring structure.

[0014] Further, the exposed end anchoring structure is located at the top of the underground structure and is exposed to the outside.

[0015] Further, the prestressed pipeline adopts a corrugated steel pipe or a PVC pipe, the top of the prestressed pipeline is connected with the exposed end anchoring structure, and the bottom of the prestressed pipeline is inserted into the prestressed pipeline connecting steel cylinder.

[0016] Further, the prestressed pipeline and the anchoring sleeve are not filled with materials.

[0017] The application further provides a construction method of the post-tensioned prestressed anchor cable, which comprises the following steps:

[0018] I. Anchoring construction

[0019] S1, groove the underground structure, bind the reinforcement cage, place the prestressed pipeline and the anchoring sleeve in the reinforcement cage, insert the bottom of the prestressed pipeline into the prestressed pipeline connecting steel cylinder, and close the bottom to prevent the concrete from entering the anchoring sleeve, then lower the reinforcement cage, pour the underground structure concrete and maintain the strength;

[0020] S2, pass the prestressed steel strand into the prestressed steel strand hole of the built-in end anchoring structure from the outside, tension the prestressed steel strand, and anchor the prestressed steel strand in the built-in end anchoring structure through the clamping piece;

[0021] S3, the built-in end anchoring structure is put into the prestressed pipe through the prestressed steel strand, the self-weight action is used, the built-in end anchoring structure is guided into the unlocking groove through the wedge-shaped guide steel sheet of the anchoring sleeve guide section, and then enters the locking groove through the fixed locking guide rail;

[0022] S4, the prestressed steel strand is lifted, the movable unlocking guide rail is lifted, the built-in end anchoring structure is combined with the tooth-shaped anchoring pressure socket of the anchoring pressure section through the movable unlocking guide rail, and the movable unlocking guide rail returns to the original position;

[0023] S5, the prestressed steel strand is tensioned at the top of the underground structure, and is anchored by using the exposed end anchoring structure;

[0024] Two, unlocking construction:

[0025] S6, the locking state of the exposed end anchoring structure at the top of the underground structure is released;

[0026] S6, the self-weight action is used, the built-in end anchoring structure is guided into the unlocking groove from the locking groove through the movable unlocking guide rail;

[0027] S7, the prestressed steel strand is lifted, and the prestressed steel strand and the built-in end anchoring structure are pulled out of the anchoring sleeve and the prestressed pipe.

[0028] Compared with the prior art, the application has the beneficial effects that:

[0029] The application provides a self-unlocking post-tensioned prestressed anchor cable and a construction method thereof, the structure is simple, the cost is low, the prestressed steel strand and the built-in end anchoring structure can be reused, and economic benefits are obvious. When the application is constructed, a prestressed tensioning operation surface does not need to be arranged underground, and the entire tensioning operation can be completed on the ground, so that the construction is convenient, and the application problem of the prestressed anchor cable in underground engineering is solved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a longitudinal section schematic view of a self-unlocking post-tensioned prestressed anchor cable provided by an embodiment of the application;

[0031] Figure 2 is a front view schematic view of a built-in end anchoring structure provided by an embodiment of the application;

[0032] Figure 3 is a longitudinal section schematic view of a built-in end anchoring structure provided by an embodiment of the application;

[0033] Figure 4 is a transverse section schematic view of a built-in end anchoring structure provided by an embodiment of the application;

[0034] Figure 5 is a longitudinal section schematic view of an anchoring sleeve provided by an embodiment of the application;

[0035] Figure 6 is a schematic view of a transverse section of a guide section of the anchoring sleeve provided by an embodiment of the present application;

[0036] Figure 7 is a schematic view of a transverse section of an anchoring pressure section of the anchoring sleeve provided by an embodiment of the present application;

[0037] Figure 8 is a schematic view of a transverse section of an unlocking guide rail section of the anchoring sleeve provided by an embodiment of the present application;

[0038] Figure 9 is a schematic view of a transverse section of a locking guide rail section of the anchoring sleeve provided by an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the present application clearer, the present application 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 application and should not be used to limit the present application.

[0040] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application; the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] Please refer to Figure 1 , shows a self-unlocking post-tensioned prestressed anchor cable provided by the present application, which comprises an exposed end anchoring structure 1, a prestressed pipe 2, a built-in end anchoring structure 3, an anchoring sleeve 4 and a prestressed steel tendon 5. Among them, the exposed end anchoring structure 1 is located at the top of the underground structure and is exposed to the outside. The prestressed pipe 2, the built-in end anchoring structure 3, the anchoring sleeve 4 and the prestressed steel tendon 5 are all located in the underground structure.

[0042] Please refer to Figures 2 to 4The built-in end anchoring structure 3 comprises an anchor plate 31 and a tooth-shaped anchoring buckle 32 arranged at the outer edge of the anchor plate 31, the bottom of the tooth-shaped anchoring buckle 32 is provided with a wedge-shaped guide tooth 321; a plurality of prestressed steel beam holes 33 are arranged in the middle of the anchor plate 31, the prestressed steel beam holes 33 are tapered from small to large, and clamping pieces 34 are arranged on the hole wall of the prestressed steel beam holes 33; when anchoring, the prestressed steel beam 5 is clamped in the anchor plate 31 through the clamping pieces 34;

[0043] Please refer to Figures 2 to 4 The anchoring sleeve 4 comprises a guide section, an anchoring pressure bearing section, an unlocking guide rail section and a locking guide rail section.

[0044] Please refer to Figures 5 to 9 The guide section comprises a prestressed pipe connecting steel cylinder 41, a guide section steel cylinder 42 and a wedge-shaped guide steel sheet 43, the inner diameter of the prestressed pipe connecting steel cylinder 41 is consistent with the outer diameter of the prestressed pipe 2.

[0045] Steel cylinders 44 are arranged on the outer sides of the anchoring pressure bearing section, the unlocking guide rail section and the locking guide rail section. The inner side of the steel cylinder 44 of the anchoring pressure bearing section is further provided with a tooth-shaped anchoring pressure bearing buckle 45, and the steel cylinder 44 of the anchoring pressure bearing section is internally provided with an anchor / unlocking channel a of the built-in end anchoring structure 3, the size of the anchor / unlocking channel a is slightly larger than the cross-sectional shape of the built-in end anchoring structure 3;

[0046] The wedge-shaped guide steel sheet 43 of the guide section is located above the tooth-shaped anchoring pressure bearing buckle 45 of the anchoring pressure bearing section, so as to ensure that the anchor / unlocking channel a is unobstructed.

[0047] The unlocking guide rail section and the locking guide rail section are internally provided with vertical partition plates 46, the cross-sectional position of the vertical partition plates 46 is located at the edge of the tooth-shaped anchoring pressure bearing buckle 45, the vertical partition plates 46 divide the inside of the anchoring sleeve 4 into a locking groove 47 and an unlocking groove 48, the top of the locking groove 47 is the tooth-shaped anchoring pressure bearing buckle 45, and the rest is the unlocking groove 48.

[0048] The unlocking guide rail section is provided with a movable unlocking guide rail 49a at the bottom of the locking groove 47, the movable unlocking guide rail 49a is in the shape of a slope and leads to the unlocking groove 48; the top of the movable unlocking guide rail 49a is not connected with the vertical partition plate 46, the bottom of the movable unlocking guide rail 49a is an active hinge that limits the turning angle, so as to ensure that the top of the movable unlocking guide rail 49a will not fall into the unlocking groove 48 when the movable unlocking guide rail 49a is moved, and the vertical partition plate 46 where the bottom of the movable unlocking guide rail 49a is located is provided with a first opening hole 461, the bottom of the first opening hole 461 is flush with the bottom of the movable unlocking guide rail 49a, and the height of the first opening hole 461 is not less than the height of the built-in end anchoring structure 3.

[0049] The fixed locking guide rail 49b is ramp-shaped and leads to the locking groove 47. The vertical partition plate 46 at the bottom of the fixed locking guide rail 49b has a second opening 462, the bottom of which is flush with the bottom of the fixed locking guide rail 49b, and the height of the second opening 462 is not less than the height of the built-in end anchoring structure 3.

[0050] The prestressed pipeline 2 is a corrugated steel pipe or a PVC pipe, the top of which is connected to the exposed end anchoring structure 1, and the bottom of which is inserted into the prestressed pipeline connecting steel cylinder 41.

[0051] The prestressed pipeline 2 and the anchoring sleeve 4 are not filled with concrete, mortar or other materials.

[0052] The construction steps of the post-tensioned prestressed anchor cable of the embodiment are as follows:

[0053] I. Anchoring construction:

[0054] S1, groove the underground structure, bind the reinforcement cage, and place the prestressed pipeline 2 and the anchoring sleeve 4 in the reinforcement cage, insert the bottom of the prestressed pipeline 2 into the prestressed pipeline connecting steel cylinder 41, and close it to prevent concrete from entering the anchoring sleeve 4, lower the reinforcement cage, pour the underground structure concrete and cure to a certain strength;

[0055] S2, pass the prestressed steel strand 5 into the prestressed steel strand hole 33 of the built-in end anchoring structure 3 from the outside, and tension the prestressed steel strand 5, and anchor the prestressed steel strand 5 in the built-in end anchoring structure 3 through the clamping piece 34;

[0056] S3, place the built-in end anchoring structure 3 into the prestressed pipeline 2 through the prestressed steel strand 5, and use the self-weight effect to make the built-in end anchoring structure 3 enter the unlocking groove 48 through the wedge-shaped guide steel sheet 43 of the anchoring sleeve 4 guide segment, and then enter the locking groove 47 through the fixed locking guide rail 49b;

[0057] S4, lift the prestressed steel strand 5, the movable unlocking guide rail 49a is lifted, the built-in end anchoring structure 3 is combined with the tooth-shaped anchoring pressure socket 45 of the anchoring pressure segment through the movable unlocking guide rail 49a, and the movable unlocking guide rail 49a returns to the original position;

[0058] S5, tension the prestressed steel strand 5 at the top of the underground structure, and anchor it with the exposed end anchoring structure 1;

[0059] II. Unlocking construction:

[0060] S6, release the locking state of the exposed end anchoring structure 1 at the top of the underground structure;

[0061] S6, by using the self-weight, the built-in end anchoring structure 3 is made to enter the unlocking groove 48 from the locking groove 47 through the movable unlocking guide rail 49a;

[0062] S7, the prestressed steel strand 5 is lifted, and the prestressed steel strand 5 and the built-in end anchoring structure 3 are pulled out of the anchoring sleeve 4 and the prestressed pipe 2.

[0063] It can be seen that the self-unlocking post-tensioning prestressed anchor cable provided in the embodiment has simple structure, low cost, and the prestressed steel strand 5 and the built-in end anchoring structure 3 can be reused, and the economic benefit is obvious. When the construction is carried out, it is not necessary to set a prestressed tensioning construction operation surface underground, and the whole tensioning operation can be completed on the ground, so that the construction is convenient, and the application problem of the prestressed anchor cable in underground engineering is solved.

[0064] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A self-unlocking post-tensioned prestressed cable, characterized in that, It comprises an exposed end anchoring structure, a prestressed pipe, an embedded end anchoring structure, an anchoring sleeve and a prestressed steel beam, wherein the prestressed pipe, the embedded end anchoring structure, the anchoring sleeve and the prestressed steel beam are located in the underground structure. The embedded end anchoring structure comprises an anchor plate and a tooth-shaped anchoring buckle arranged on the outer edge of the anchor plate, and the middle part of the anchor plate is provided with a plurality of prestressed steel beam holes in a taper shape with a small upper part and a large lower part. The anchoring sleeve comprises a guide section, an anchoring pressure bearing section, an unlocking guide rail section and a locking guide rail section. The guide section comprises a prestressed pipe connecting steel cylinder, a guide section steel cylinder and a wedge-shaped guide steel sheet, and the inner diameter of the prestressed pipe connecting steel cylinder is consistent with the outer diameter of the prestressed pipe. The outer sides of the anchoring pressure bearing section, the unlocking guide rail section and the locking guide rail section are provided with steel cylinders. The inner side of the steel cylinder of the anchoring pressure bearing section is further provided with a tooth-shaped anchoring pressure bearing buckle, and the inside of the steel cylinder of the anchoring pressure bearing section is provided with an anchor insertion / unlocking channel of the embedded end anchoring structure, and the size of the anchor insertion / unlocking channel is slightly larger than the cross-sectional shape of the embedded end anchoring structure. The wedge-shaped guide steel sheet of the guide section is located above the tooth-shaped anchoring pressure bearing buckle of the anchoring pressure bearing section to ensure the smoothness of the anchor insertion / unlocking channel. The inside of the unlocking guide rail section and the locking guide rail section is provided with a vertical partition plate, and the cross-sectional position is located at the edge of the tooth-shaped anchoring pressure bearing buckle. The bottom of the locking groove of the unlocking guide rail section is provided with a movable unlocking guide rail in a slope shape leading to the unlocking groove. The bottom of the locking groove of the locking guide rail section is provided with a fixed locking guide rail in a slope shape leading to the locking groove. I. Anchoring construction: S1, groove the underground structure, bind the reinforcement cage, and place the prestressed pipe and the anchoring sleeve in the reinforcement cage, insert the bottom of the prestressed pipe into the prestressed pipe connecting steel cylinder, and close it to prevent concrete from entering the anchoring sleeve, lower the reinforcement cage, pour the underground structure concrete and cure to a certain strength. S2, externally thread the prestressed steel strand into the prestressed steel strand hole of the built-in end anchoring structure, and tension the prestressed steel strand, and anchor the prestressed steel strand in the built-in end anchoring structure through the clamping piece; S3, place the built-in end anchoring structure into the prestressed pipe through the prestressed steel strand, and use the self-weight effect to make the built-in end anchoring structure pass through the wedge-shaped guide steel sheet of the anchoring sleeve guide section into the unlocking groove, and then pass through the fixed locking guide rail into the locking groove; S4, lift the prestressed steel strand, lift the movable unlocking guide rail, the built-in end anchoring structure passes through the movable unlocking guide rail and the tooth-shaped anchoring pressure socket of the anchoring pressure section, and the movable unlocking guide rail returns to the original position; S5, tension the prestressed steel strand at the top of the underground structure, and anchor by using the exposed end anchoring structure; II. Unlocking construction: S6, release the locking state of the exposed end anchoring structure at the top of the underground structure; S6, use the self-weight effect to make the built-in end anchoring structure pass through the movable unlocking guide rail from the locking groove into the unlocking groove; S7, lift the prestressed steel strand, and pull out the prestressed steel strand and the built-in end anchoring structure from the anchoring sleeve and the prestressed pipe.

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