CN214614049U

CN214614049U - Prestressed anchor cable structure

Info

Publication number: CN214614049U
Application number: CN202023245254.XU
Authority: CN
Inventors: 黄俊光; 肖喆; 林祖锴; 李伟科; 李健斌; 李磊; 邬君宇; 陈香波; 林悦森
Original assignee: Guangzhou Design Institute Group Co ltd
Current assignee: Guangzhou Design Institute Group Co ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-11-05
Anticipated expiration: 2030-12-29

Abstract

The utility model relates to a prestressed anchorage cable structure, including anchor section, free section, ground tackle and sleeve pipe, the free section is located to the bushing sleeve, and it has the mortar layer to fill between sleeve pipe and the free section. The anchorage device comprises an anchor head steel plate embedded in the supporting structure. Because the free section is wrapped by the sleeve, and a mortar layer is filled between the steel strand of the free section and the inner wall of the sleeve. Therefore, groundwater can be effectively blocked. In addition, the anchor head steel plate of the anchorage device is pre-embedded in a supporting structure, and the supporting structure is generally a reinforced concrete structure. Therefore, most of the anchor head steel plate can be wrapped by concrete through pre-embedding, and accordingly rainwater is blocked. Therefore, the prestressed anchor cable structure can effectively separate the free section and the anchorage from underground water and rainwater respectively, so that the steel strand and the anchorage of the free section are effectively prevented from being corroded by water, and the corrosion resistance of the prestressed anchor cable structure is remarkably improved.

Description

Prestressed anchor cable structure

Technical Field

The utility model relates to a civil engineering technical field, in particular to prestressed anchorage cable structure.

Background

The prestressed anchor cable is a cable-shaped support for anchoring the anchor cable in the rock body by adopting a prestressed method and is used for reinforcing the side slope. The prestressed anchor cable is a common slope supporting structure form, generally comprising a tension section, an anchorage device, a free section and an anchoring section, wherein the anchorage device, the free section and the anchoring section are permanent structures and are required to have the same service life as the service life of the slope engineering design.

The durability of the prestressed anchor cable depends on the corrosion protection effect of the anchor cable, particularly the anchorage and the free section. Although the steel strand wires and the anchorage devices at the free sections can be subjected to corrosion prevention treatment in the construction process, the anchorage devices and the steel strand wires at the free sections still can be corroded under the erosion of underground water and rainwater along with the passage of time, so that the anchor cables fail in advance.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a prestressed anchor cable structure with better corrosion resistance.

The prestressed anchor cable structure comprises an anchoring section, a free section and an anchor, and further comprises a sleeve, wherein the sleeve is sleeved on the free section, a mortar layer is filled between the sleeve and the free section, at least part of the sleeve covers the free section and extends to one end, connected with the anchor, of the free section, and the anchor comprises an anchor head steel plate embedded in a supporting structure in advance.

In one embodiment, the surface of the free section is coated with a winding layer of asphalt fiberglass cloth and/or corrugated pipe.

In one embodiment, the sleeve is a polyvinyl chloride pipe.

In one embodiment, the sleeve is a circular tubular structure, and the sleeve is disposed coaxially with the free section.

In one embodiment, the concrete sealing structure is formed on the supporting structure and covers the anchorage device.

In one embodiment, the framework of the concrete enclosed structure comprises a plurality of axial steel bars and circumferential steel bars, the plurality of axial steel bars are vertically arranged on the surface of the anchor head steel plate and are arranged along the circumferential direction of the anchor head steel plate at intervals, and the circumferential steel bars are wound on the plurality of axial steel bars.

In one embodiment, the anchor head steel plate is of a rectangular plate structure, and the four axial steel bars are welded at four top corners of the four anchor head steel plates respectively.

In one embodiment, the concrete enclosing structure further comprises a limiting pipe covering the anchor head steel plate, and the plurality of axial reinforcing steel bars and the circumferential reinforcing steel bars are located in the limiting pipe.

In one embodiment, the limiting pipe is a polyvinyl chloride pipe.

In one embodiment, the limiting pipe is of a circular tubular structure, and the limiting pipe and the anchor head steel plate are coaxially arranged.

In the prestressed anchor cable structure, the free section is wrapped by the sleeve, and a mortar layer is filled between the steel strand of the free section and the inner wall of the sleeve. Therefore, groundwater can be effectively blocked. In addition, the anchor head steel plate of the anchorage device is pre-embedded in a supporting structure, and the supporting structure is generally a reinforced concrete structure. Therefore, most of the anchor head steel plate can be wrapped by concrete through pre-embedding, and accordingly rainwater is blocked. Therefore, the prestressed anchor cable structure can effectively separate the free section and the anchorage from underground water and rainwater respectively, so that the steel strand and the anchorage of the free section are effectively prevented from being corroded by water, and the corrosion resistance of the prestressed anchor cable structure is remarkably improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of a pre-stressed anchor cable structure according to a preferred embodiment of the present invention;

FIG. 2 is an enlarged schematic view of a part A of the prestressed anchor cable structure shown in FIG. 1;

fig. 3 is an end view of detail a shown in fig. 2.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, a prestressed anchor cable structure 100 according to a preferred embodiment of the present invention includes an anchoring section 110, a free section 120, an anchor 130, and a sleeve 140.

The anchoring section 110 and the free section 120 may be an integrated steel strand, and the anchor 130 may be a plate-shaped or block-shaped structure with a fastening structure. Free segment 120 is used to connect anchor segment 110 with anchorage 130. Wherein the anchoring section 110 is anchored in the rock mass and the anchor 130 is fixed to a supporting structure 200 (e.g., a fender pile). After the free section 120 is tensioned, the supporting structure 200 is tightened against the rock mass for reinforcement.

The sleeve 140 is formed of a water impermeable material and may be a circular tube, a square tube, or the like. In the present embodiment, the sleeve 140 is a polyvinyl chloride pipe, i.e., a PVC pipe. The corrosion resistance of the PVC pipe is excellent, so that the sleeve 140 can meet the design requirement of the service life of the prestressed anchor cable structure 100.

The sleeve 140 is sleeved on the free section 120, and a mortar layer (not shown) is filled between the sleeve 140 and the free section 120. Wherein sleeve 140 at least partially covers free section 120 and extends to the end of free section 120 that connects to anchor 130. Sleeve 140 may cover the entire free section or only the end of free section 120 adjacent anchor 130. The casing 140 and the mortar layer filled in the casing 140 can effectively separate the free section 120 from the groundwater, thereby preventing corrosion of the steel strands of the free section 120 due to groundwater erosion.

In this embodiment, the surface of the free section 120 is coated with a winding layer of asphalt fiberglass cloth and/or corrugated tubing. The asphalt fiberglass cloth winding layer and the corrugated pipe can be coated on the surface of the free section 120 in advance before construction, and the asphalt fiberglass cloth winding layer and the corrugated pipe can play a role in further protecting and blocking underground water for the free section 120, so that the corrosion resistance is further improved. Moreover, due to the effect of the asphalt fiberglass cloth winding layer or the corrugated pipe, the free section 120 can still be freely deformed after being filled with mortar, so that the normal operation of the prestressed anchor cable structure 100 is not affected.

In the present embodiment, the sleeve 140 has a circular tubular structure, and the sleeve 140 is disposed coaxially with the free section 120. The rounded sleeve 140 has a smooth inner wall and no corners. Therefore, hollowing is less likely to occur when injecting mortar into the sleeve 140, thereby making the mortar layer more uniform. Moreover, since the sleeve 140 is coaxially disposed with the free section 120, the formed mortar layer is uniformly coated around the free section 120. Thus, the casing 140 and the mortar layer have better effect of blocking the groundwater, which is beneficial to further improving the corrosion resistance of the free section 120.

Referring to fig. 2 and 3, anchor 130 includes a head plate 131 embedded in a supporting structure 200. The anchor head steel plate 131 may be a plate-shaped structure of a circle, a square or other shape, and the supporting structure 200 is generally a reinforced concrete structure. Before the supporting structure 200 is poured, the anchor head steel plate 131 may be placed in a formwork of the supporting structure 200, and after the pouring is completed, the anchor head steel plate 131 may be buried in the supporting structure 200. By embedding, most of the anchor head steel plate 131 can be wrapped by concrete, so that rainwater can be blocked. Therefore, corrosion of anchor 130 due to erosion by rainwater can be effectively prevented.

In this embodiment, the prestressed anchorage structure 100 further includes a concrete enclosing structure 150 formed at the supporting structure and covering the anchorage 130. Concrete enclosing structure 150 can play a further role in the separation of rainwater for anchorage 130, thereby enabling the corrosion resistance of anchorage 130 to be further improved.

Further, in this embodiment, the framework of the concrete enclosing structure 150 includes a plurality of axial reinforcements 151 and a circumferential reinforcement 152, the plurality of axial reinforcements 151 are vertically disposed on the surface of the anchor head steel plate 131 and are circumferentially spaced along the anchor head steel plate 131, and the circumferential reinforcement 152 is wound on the plurality of axial reinforcements 151.

Specifically, the framework formed by the plurality of axial reinforcements 151 and the circumferential reinforcements 152 can provide better support for the concrete sealing structure 150 from the axial direction, the radial direction and the circumferential direction, so that the structural strength is higher, the concrete sealing structure is not easy to crack in a severe use environment, and the protection effect on the anchorage device 130 is better.

Specifically, in this embodiment, the anchor head steel plate 131 is a rectangular plate structure, and the four axial rebars 151 are welded to four top corners of the four anchor head steel plates 131 respectively. In this way, the distribution of the stress points of the axial rebars 151 on the anchor head steel plate 131 is more balanced, and the stability of the concrete enclosed structure 150 is higher.

In this embodiment, the concrete enclosing structure 150 further includes a limiting tube 153 covering the anchor head steel plate 131, and the plurality of axial reinforcements 151 and the circumferential reinforcements 152 are located in the limiting tube 153.

The limiting tube 153 is a tubular structure with two open ends, and can be a round or square tubular structure. In one aspect, the restraining tube 153 may be used as a template during the pouring of the concrete enclosure 150. Therefore, the die filling and removing operations in the pouring process are omitted, and the efficiency is improved. On the other hand, after the concrete enclosed structure 150 is formed, the limiting pipe 153 is integrally coated on the outermost layer of the concrete enclosed structure 150, so that the effect of further isolating rainwater can be achieved, and the waterproof performance of the anchorage device 130 is further improved.

The stopper tube 153 is also molded from a waterproof material. Specifically, in this embodiment, the limiting tube 153 is a polyvinyl chloride tube. The corrosion resistance of the PVC pipe is excellent, so that the limit pipe 153 meets the design requirement of the service life of the prestressed anchor cable structure 100. Meanwhile, the PVC pipe is easy to obtain and low in cost.

Further, in the present embodiment, the limiting tube 153 has a circular tubular structure, and the limiting tube 153 is disposed coaxially with the anchor head steel plate 131.

The inner wall of the round limiting pipe 153 is smooth, and no corner exists. Therefore, hollowing is not easily generated when the concrete sealing structure 150 is poured, and thus, the sealing effect is prevented from being affected by the generation of a cavity inside the concrete sealing structure 150. Moreover, because the limiting pipe 153 is coaxially arranged with the anchor head steel plate 131, the poured concrete structure is uniformly coated around the anchor head steel plate 131, and the effect of blocking rainwater is better.

The construction process of the pre-stressed anchor cable structure 100 is as follows:

1. and constructing on the rock mass according to the construction specification, and anchoring the anchoring section 110 in the rock mass through the anchor cable hole. After the operations of derusting the steel strand at the free section 120, brushing paint, winding asphalt glass fiber cloth or wrapping corrugated pipes outside, and the like are carried out, mortar is injected into the anchor cable hole until the mortar overflows from the opening.

2. Before the mortar is completely set (typically within one hour of grouting), a sleeve 140 is inserted into the anchor cable orifice. For example, in a construction scenario, the diameter of the sleeve 140 is 70 mm, the length is 2.5 m, and the depth of the sleeve 140 inserted into the grout is 1 m, i.e., the length of the sleeve 140 wrapped around the free section 120 is 1 m. In this manner, the sleeve 140 can be secured to the anchorage hole and can keep the steel strand straight.

3. The support structure 200 is formed, and the specific formed portion may be a crown (waist) beam to which the anchor 130 is generally fixed. And (3) erecting a formwork, binding reinforcing steel bars, avoiding the sleeve 140, and cutting off the redundant part of the sleeve 140 protruding out of the crown (waist) beam. The sleeve 140 is filled with mortar before the concrete is poured, thereby forming a mortar layer within the sleeve 140.

4. Before the crown (waist) beam is poured, the anchor head steel plate 131 is buried in the formwork. And (5) pouring concrete, and tensioning the prestressed anchor cable 100 to a locking value after the crown (waist) beam reaches the age.

5. Four axial reinforcing steel bars 151 are spot-welded on the anchor head steel plate 131, two-limb annular reinforcing steel bars 152 are wrapped outside the anchor head steel plate to serve as stirrups, and meanwhile, the outer protective sleeve 153 serves as a template. In a construction scene, the outer diameters of the axial reinforcement 151 and the externally wrapped circumferential reinforcement 152 are 12 mm and 6 mm, respectively, and the inner diameter of the protection tube 153 is 400 mm and the length thereof is 200 mm. Then, concrete is poured into the protection tube 153, and the poured thickness is not less than a preset value. After molding, the portion of the protective tube 153 protruding from the concrete surface may be cut off.

In the prestressed anchor cable structure 100, the free section 120 is wrapped by the sleeve 140, and a mortar layer is filled between the steel strand of the free section 120 and the inner wall of the sleeve 140. Therefore, groundwater can be effectively blocked. In addition, the head steel plate 131 of the anchor 130 is embedded in a supporting structure, which is generally a reinforced concrete structure. Therefore, by embedding, most of the anchor head steel plate 131 can be wrapped by concrete, so that rainwater can be blocked. Therefore, the pre-stressed anchor cable structure 100 can effectively isolate the free section 120 and the anchorage 130 from the ground water and the rainwater, so that the steel strand of the free section 120 and the anchorage 130 are effectively prevented from being corroded by water, and the corrosion resistance of the pre-stressed anchor cable structure 100 is remarkably improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The prestressed anchor cable structure is characterized by further comprising a sleeve, the sleeve is sleeved on the free section, a mortar layer is filled between the sleeve and the free section, the sleeve at least partially covers the free section and extends to one end, connected with the anchor, of the free section, and the anchor comprises an anchor head steel plate embedded in a supporting structure.

2. The prestressed anchor rope structure of claim 1, wherein the surface of said free section is coated with a winding layer of asphalt fiberglass cloth and/or corrugated pipe.

3. The prestressed anchor rope structure of claim 1, wherein said sleeve is a polyvinyl chloride pipe.

4. The prestressed anchor rope structure of claim 1, wherein said sleeve is a circular tubular structure, and said sleeve is coaxially disposed with said free section.

5. The prestressed anchorage cable structure of claim 1, further comprising a concrete enclosing structure formed on the supporting structure and covering the anchorage.

6. The prestressed anchor rope structure of claim 5, wherein the framework of the concrete closed structure includes a plurality of axial reinforcing bars and circumferential reinforcing bars, the plurality of axial reinforcing bars are vertically disposed on the surface of the anchor head steel plate and are spaced apart from each other in the circumferential direction of the anchor head steel plate, and the circumferential reinforcing bars are wound around the plurality of axial reinforcing bars.

7. The prestressed anchor cable structure of claim 6, wherein said anchor head steel plate is a rectangular plate, and four of said axial reinforcing bars are welded to four corners of said anchor head steel plate, respectively.

8. The prestressed anchor rope structure of claim 6, wherein said concrete enclosing structure further comprises a limiting pipe covering said anchor head steel plate, and said plurality of axial reinforcing bars and said circumferential reinforcing bar are located in said limiting pipe.

9. The prestressed anchor rope structure of claim 8, wherein said limiting pipe is a polyvinyl chloride pipe.

10. The prestressed anchor rope structure of claim 8, wherein said limiting pipe is a circular tubular structure, and said limiting pipe is coaxially disposed with said anchor head steel plate.