Compensation-free tension-compression composite anchor cable

Abstract

The utility model relates to the technical field of anchor cables, and discloses a compensation-tensioning-free tension-compression composite anchor cable which comprises an anchor head, a free section and an anchoring section which are sequentially arranged, and the anchoring section is provided with an anchor cable set and a bearing body; a plurality of anchor cable groups are arranged, each anchor cable group comprises at least one steel strand, the lengths of the steel strands in the same anchor cable group are consistent, and the lengths of the steel strands between the anchor cable groups are different; the bearing bodies correspond to the anchor cable sets, and the bearing bodies are anchored to the ends, away from the anchor heads, of the steel strands in the corresponding anchor cable sets. And by taking the bearing body on the anchor cable group with the shortest length of the steel strand as a reference, the steel strands in the other anchor cable groups are stripped from the bearing body serving as the reference along the direction far away from the anchor head to form a bonding section. The situation that the anchor cable construction quality is unstable due to the quality problem of constructors can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of anchor cables, and in particular to a tension-compression composite anchor cable that does not require compensatory tensioning. Background Art

[0002] At present, during the construction of anchor cables, it is usually necessary to carry out anchor cable compensation tensioning. Compensation tensioning construction is the process of calculating the differential load between the steel strands on the anchor cable after the anchor cable is installed, and compensating and tensioning each steel strand according to the corresponding differential load. The main purpose of this step is to eliminate the load difference caused by the different lengths of each steel strand, so that each steel strand is in the same stress state when the anchor cable is finally tensioned.

[0003] However, when carrying out compensating tensioning construction, due to differences in workers' technical level and operating experience, there is often a deviation between the setting of the compensating tensioning value and the actual operation. This deviation can easily have an adverse effect on the control of construction quality and leave potential quality risks for the project. Utility Model Content

[0004] In order to reduce the situation where the quality of anchor cable construction is unstable due to the quality problems of construction workers, the present application provides a tension-compression composite anchor cable that does not require compensation tensioning.

[0005] The present application provides a tension-compression composite anchor cable without compensatory tensioning, which adopts the following technical solution:

[0006] A tension-compression composite anchor cable without compensating tensioning, comprising: an anchor head, a free section and an anchor section arranged in sequence, wherein the anchor section comprises an anchor cable group and a bearing body; the anchor cable groups are multiple, each of the anchor cable groups comprises at least one steel strand, the steel strands in the same anchor cable group are of the same length, and the lengths of the steel strands between the anchor cable groups are different;

[0007] The bearing body corresponds to the anchor cable group, and the bearing body is anchored to the end of the steel strand in the corresponding anchor cable group away from the anchor head;

[0008] Taking the bearing body on the anchor cable group with the shortest length of the steel strand as a reference, the steel strands in the remaining anchor cable groups are peeled off from the bearing body as a reference in a direction away from the anchor head to form a bonding section.

[0009] By adopting the above technical scheme, when grouting the anchor cable, the bonding section of the steel strand with the outer skin peeled off can bond with the grouting body, so that the starting point of the steel strand tension is changed to the bearing body of the shortest steel strand, so that the length of each steel strand subjected to prestressing is consistent, thereby eliminating the step of compensating tensioning, reducing the situation of unstable anchor cable construction quality caused by the quality problems of construction personnel, and improving construction efficiency.

[0010] Optionally, the bonded section of the steel strand extends to the carrier to which it is anchored.

[0011] By adopting the above technical solution, the bonding degree between the bonding section and the grouting body is improved.

[0012] Optionally, the steel strands in each anchor cable group are arranged alternately in the circumferential direction.

[0013] By adopting the above technical solution, the anchor cable is evenly stressed in multiple directions.

[0014] Optionally, the carrier can simultaneously allow the steel strands of the corresponding anchor cable group and the steel strands of the remaining anchor cable groups to pass through.

[0015] By adopting the above technical solution, the bearing body can support the steel strand and improve the stability of the steel strand during the movement of the anchor cable.

[0016] Optionally, the carrier is provided with a grouting pipe extending from the anchor head to the anchoring section.

[0017] By adopting the above technical solution, the grouting pipe is limited by the supporting body, so as to improve the stability of the grouting pipe.

[0018] Optionally, an enclosing drilling seat is connected to the carrier body which is farthest from the anchor head, and the drilling seat encloses the steel strand and has a pointed end.

[0019] By adopting the above technical solution, the tip of the drilling seat can guide the movement of the anchor cable and help reduce the resistance during the anchor cable drilling process, further improving the construction efficiency.

[0020] Optionally, the interior of the drilling seat is hollow, and the drilling seat has an overflow hole connecting the outside of the drilling seat with the inner cavity.

[0021] By adopting the above technical solution, the grouting liquid can flow inside and outside the drilling seat through the overflow hole, thereby further limiting the drilling seat.

[0022] Optionally, the bearing body includes a bearing plate, an extrusion member and a limiting plate; the steel strand passes through the bearing plate and the limiting plate at the same time, the extrusion member is fastened to the steel strand, and the extrusion sleeve is limited between the bearing plate and the limiting plate.

[0023] By adopting the above technical solution, the bearing plate and the limiting plate clamp the extrusion piece, so that the bearing plate, the extrusion piece and the limiting plate can jointly anchor the corresponding steel strands.

[0024] Optionally, the bearing plate and the limiting plate are connected via bolts and nuts.

[0025] By adopting the above technical solution, the connection method using bolts and nuts is fast, convenient and stable.

[0026] Optionally, the bearing plate is made of steel.

[0027] By adopting the above technical solution, the steel has high strength and durability, so that the bearing plate is not easily deformed or damaged due to stress during long-term use of the swimming pool. The bearing plate made of steel can withstand greater tension and pressure, which improves the overall bearing capacity of the anchor cable.

[0028] In summary, the present application includes at least one of the following beneficial effects:

[0029] 1. By taking the bearing body of the shortest steel strand as the reference, peeling off the outer skin of other steel strands to form a bonded section, so that the bonded section of the steel strand is bonded to the grouting body, so that each steel strand has the same tensile length, thus eliminating the need for compensatory tensioning, simplifying the construction process, and improving construction efficiency and quality;

[0030] 2. The extrusion part is limited by the connection and cooperation between the bearing plate and the limiting plate, so that the bearing body is limited at the end of the steel strand and is not easily displaced.

[0031] 3. The bearing body is made of steel, which has high strength and stability, and can ensure the safety and reliability of the anchor cable during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of the anchor cable after grouting in the embodiment of the present application;

[0033] Figure 2 It is a schematic diagram of the steel strand explosion structure of the tension unit and the pressure unit in the embodiment of the present application;

[0034] Figure 3 yes Figure 1 Sectional view at AA in the middle;

[0035] Figure 4 yes Figure 1 Cross-section at the middle BB;

[0036] Figure 5 This is a schematic diagram of the structure of the carrier and the steel strand in the embodiment of the present application;

[0037] Figure 6 is a schematic diagram of the structure of the load-bearing plate in an embodiment of the present application;

[0038] Figure 7 yes Figure 5 Schematic diagram of the enlarged structure at C in the middle;

[0039] Figure 8 It is a structural schematic diagram of the drilling seat in the embodiment of the present application.

[0040] Explanation of the reference numerals: 1. Anchor head; 2. Free section; 3. Anchoring section; 4. Anchor cable group; 41. Steel strand; 5. Bearing body; 51. Bearing plate; 52. Extrusion piece; 521. Extrusion spring; 522. Extrusion sleeve; 53. Limiting piece; 6. Bonding section; 7. Grouting pipe; 8. Drilling seat; 9. Overflow hole; 10. Pressure unit; 11. Tension unit; 12. Perforation; 13. Through hole. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-8 This application is described in further detail.

[0042] The present application embodiment discloses a tension-compression composite anchor cable without compensatory tensioning. Figure 1 The tension-compression composite anchor cable without compensation tensioning comprises an anchor head 1, a free section 2 and an anchor section 3 which are arranged in sequence. After the anchor cable is installed on the slope, the anchor head 1 is located outside the slope and exposed on the slope surface. The free section 2 and the anchor section 3 are located in the slope. The anchor section 3 is located at the lowest end of the anchor cable, penetrates into the slope, and is located in the stable rock and soil below the potential sliding surface or rupture surface (not shown in the figure).

[0043] Reference Figure 1 and Figure 2 The anchoring section 3 has an anchor cable group 4 and a carrier 5. There are multiple anchor cable groups 4, each anchor cable group 4 includes at least one steel strand 41, the lengths of the steel strands 41 in the same anchor cable group 4 are consistent, the lengths of the steel strands 41 in different anchor cable groups 4 are different, and one end of the steel strands 41 in all anchor cable groups 4 extends to the anchor head 1 and is connected by the same anchor.

[0044] Reference Figure 3 and Figure 4 In this embodiment, the anchor cable group 4 has two groups, and the number of steel strands 41 in each anchor cable group 4 is three; in other embodiments, the anchor cable group 4 can be two groups, and the number of steel strands 41 in each anchor cable group 4 can be two. In addition, the steel strand 41 is preferably a high-strength, low-relaxation, non-bonded steel strand with a diameter of 15.20 mm and a strength of 1860 MPa.

[0045] The number and position of the bearing bodies 5 correspond to the anchor cable groups 4 one by one, and the bearing bodies 5 are anchored at the end of the corresponding anchor cable group 4 away from the anchor head 1. Among all the anchor cable groups 4, the anchor cable group 4 with the shortest steel strand 41 is defined as the pressure unit 10, and the remaining anchor cable groups 4 are defined as the tension unit 11. The steel strands 41 in the anchor cable group 4 of the pressure unit 10 are all unbonded steel strands 41 with outer skins. The steel strands 41 in the anchor cable group 4 of the tension unit 11 include bonded sections 6.

[0046] Reference Figure 2 Specifically, taking the bearing body 5 at the end of the steel strand 41 of the pressure unit 10 as a reference, each steel strand 41 in the tension unit 11 starts from the reference bearing body 5, and the outer skin of the steel strand 41 is peeled off in a direction away from the anchor head 1 to expose the inner core of the steel strand 41, and the steel strand 41 is peeled until the bearing body 5 to which the steel strand 41 itself is anchored. The portion of the steel strand 41 with the outer skin peeled off is the bonding section 6.

[0047] Reference Figure 1 and Figure 2 After the anchor cable is placed in the slope, grouting is carried out. The bonded section 6 of the steel strand 41 of the tension unit 11 is peeled off from the outer skin, so that after grouting, the bonded section 6 is bonded to the grouting body as a whole. The rest of the steel strand 41 of the tension unit 11 except the bonded section 6 and the steel strand 41 of the pressure unit 10 are not stripped of external force, so that the inner core of the steel strand 41 can stretch and move in the outer skin for prestressing, so that the starting point of the tensioning of the steel strand 41 of the tension unit 11 and the steel strand 41 of the tension unit 11 are both at the bearing body 5 of the pressure unit 10, even if the length of all the steel strands 41 subjected to prestressing is the same, the step of compensating tensioning can be omitted.

[0048] Reference Figure 2 and Figure 5 Further, each group of carriers 5 includes a carrier plate 51, an extrusion member 52 and a stopper 53. The carrier plate 51 is made of steel and is disc-shaped. Preferably, the steel type of the carrier plate 51 is No. 45, and the thickness of the carrier plate 51 is not less than 2.5 cm.

[0049] Reference Figure 5 and Figure 6 The bearing plate 51 is provided with through holes 12 for the steel strands 41 to pass through. The number of through holes 12 is adapted to the number of steel strands 41 at the position of the bearing plate 51, so that all the steel strands 41 at the position of the anchor cable at the bearing plate 51 pass through the same bearing plate 51. Figure 1 For example, all the steel strands 41 pass through the bearing plate 51 closest to the anchor head 1, that is, the number of perforations 12 on the bearing plate 51 closest to the anchor head 1 is consistent with the number of all the steel strands 41 on the anchor cable. In addition, the perforations 12 on the bearing plate 51 are evenly spaced along the circumference of the bearing plate 51, and the steel strands 41 in each anchor cable group 4 are alternately distributed along the circumference of the bearing plate 51.

[0050] Reference Figure 5 and Figure 6The extrusion member 52 includes an extrusion spring 521 and an extrusion sleeve 522. The extrusion spring 521 is spirally wound around one end of the steel strand 41 passing through the corresponding bearing plate 51. The extrusion sleeve 522 is formed by splicing halves and sleeved on the extrusion spring 521. The extrusion sleeve 522 is deformed by extruding the extrusion spring 521 to squeeze the steel strand 41, so that the extrusion spring 521 and the extrusion sleeve 522 are positioned relative to the steel strand 41. The size of the extrusion sleeve 522 is larger than the size of the through hole 12 to limit the bearing plate 51 from being separated from the end of the steel strand 41 away from the anchor head 1. In other embodiments, the through hole 12 can be set to a wedge shape so that the extrusion sleeve 522 is fastened in the through hole 12 of the bearing plate 51 when the steel strand 41 is tensioned.

[0051] Reference Figure 5 The limiting piece 53 is also made of steel and is in the shape of a disk. The limiting piece 53 is provided with through holes 13 corresponding to the through holes 12 on the bearing plate 51. The size and position of the through holes 13 are consistent with the corresponding through holes 12. The through holes 13 are used to pass the steel strands 41. After the extrusion sleeve 522 is installed on the end of the steel strand 41, the limiting piece 53 is sleeved on the steel strand 41 through the through hole 13, so that the extrusion sleeve 522 is clamped between the bearing plate 51 and the limiting piece 53, and then the bearing plate 51 is connected to the limiting piece 53, so that the extrusion sleeve 522 and the bearing plate 51 can be limited, so that the bearing plate 51 is not easily displaced on the corresponding steel strand 41, so that the end of the steel strand 41 is anchored at the corresponding bearing body 5.

[0052] In this embodiment, the bearing plate 51 and the limiting plate 53 are connected by bolts and nuts, the bolt rods pass through the bearing plate 51 and the limiting plate 53 in sequence, the bolt head abuts against the side of the bearing plate 51 away from the limiting plate 53, and the nut is threadedly connected to the bolt and abuts against the side of the limiting plate 53 away from the bearing plate 51. In other embodiments, the bearing plate 51 and the limiting plate 53 can also be welded by a connecting rod.

[0053] Reference Figure 2 and Figure 5 , the bonded section 6 of the steel strand 41 in the tension unit 11 starts from the bearing plate 51 in the pressure unit 10 and ends at the bearing plate 51 anchored by itself. When the steel strand 41 of the tension unit 11 is pulled, the grouting body is pulled, and the load is transferred to the grouting body in the form of tensile stress, and the grouting body acts on the rock mass in the form of shear stress; when the steel strand 41 of the pressure unit 10 is pulled, after the tensile force is transferred to the bearing plate 51 at the end of the steel strand 41, pressure is applied to the grouting body through the bearing plate 51, that is, the load is transferred to the grouting body in the form of compressive stress, and the grouting body acts on the rock mass in the form of shear stress.

[0054] Reference Figure 1 and Figure 5Furthermore, in order to facilitate grouting, a common grouting pipe 7 is provided at the center of all the bearing plates 51 and the limiting pieces 53, and the grouting pipe 7 extends from the anchor head 1 to the limiting piece 53 farthest from the anchor head 1 in the anchor cable.

[0055] Reference Figure 1 and Figure 8 Furthermore, in order to facilitate the anchor cable to enter the drill hole of the slope, a drilling seat 8 is fixedly welded on the bearing plate 51 away from the anchor head 1. The drilling seat 8 is hollow inside and welded to the side of the bearing plate 51 away from the anchor head 1. Figure 5 The drilling seat 8 encloses the end of the steel strand 41 corresponding to the bearing plate 51 and the limiting plate 53, and the end of the drilling seat 8 away from the bearing plate 51 presents a tip whose outer diameter gradually decreases away from the bearing plate 51, so as to guide the anchor cable when the anchor cable enters the drill hole in the slope, so that the anchor cable is not easily stuck on the wall of the drill hole.

[0056] The end of the grouting pipe 7 away from the anchor head 1 is located in the drilling seat 8. Therefore, an overflow hole 9 connecting the outside and the inner cavity of the drilling seat 8 is opened on the drilling seat 8, so that the grouting liquid flows out from the overflow hole 9 into the space between the slope hole wall and the steel strand 41.

[0057] The implementation principle of a tension-compression composite anchor cable that does not require compensatory tensioning in an embodiment of the present application is as follows: the steel strand 41 in the tension unit 11 takes the bearing plate 51 of the pressure unit 10 as the starting point and the bearing plate 51 to which the steel strand 41 is anchored itself as the end point, and the outer skin of the steel strand 41 between the two bearing plates 51 is peeled off to form a bonding section 6, so that the bonding section 6 is solidified in the grouting body during grouting, so that the starting point of the change of prestressing of the steel strand 41 in the tension unit 11 and the pressure unit 10 is located at the bearing plate 51 of the pressure unit 10, thereby eliminating the process of compensatory tensioning of steel strands 41 of different lengths.

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A tension-compression composite anchor cable without compensatory tensioning, characterized in that: include: An anchor head (1), a free section (2) and an anchor section (3) are arranged in sequence, the anchor section (3) having an anchor cable group (4) and a carrier (5); the anchor cable groups (4) are multiple, each of the anchor cable groups (4) comprises at least one steel strand (41), the steel strands (41) in the same anchor cable group (4) are of the same length, and the lengths of the steel strands (41) between the anchor cable groups (4) are different; The carrier (5) corresponds to the anchor cable group (4), and the carrier (5) is anchored to the end of the steel strand (41) in the corresponding anchor cable group (4) away from the anchor head (1); Taking the bearing body (5) on the anchor cable group (4) with the shortest length of the steel strand (41) as a reference, the steel strands (41) in the remaining anchor cable groups (4) are peeled off from the bearing body (5) as a reference in a direction away from the anchor head (1) to form a bonding section (6).

2. A tension-compression composite anchor cable without compensatory tensioning according to claim 1, characterized in that: The bonded section (6) of the steel strand (41) extends to the carrier (5) to which it is anchored.

3. The tension-compression composite anchor cable without compensation tension according to claim 1, characterized in that: The steel strands (41) in each of the anchor cable groups (4) are arranged alternately in sequence along the circumferential direction.

4. The tension-compression composite anchor cable without compensatory tensioning according to claim 1, characterized in that: The carrier (5) is capable of simultaneously allowing the steel strands (41) of the corresponding anchor cable group (4) and the steel strands (41) of the remaining anchor cable groups (4) to pass through.

5. The tension-compression composite anchor cable without compensatory tensioning according to claim 1, characterized in that: The carrier (5) is provided with a grouting pipe (7) extending from the anchor head (1) to the anchoring section (3).

6. The tension-compression composite anchor cable without compensatory tensioning according to claim 1, characterized in that: An enclosing drilling seat (8) is connected to the carrier (5) that is farthest from the anchor head (1); the drilling seat (8) encloses the steel strand (41) and has a pointed end.

7. A tension-compression composite anchor cable without compensatory tensioning according to claim 6, characterized in that: The drilling seat (8) is hollow inside, and is provided with a grout overflow hole (9) communicating with the outside and the inner cavity of the drilling seat (8).

8. The tension-compression composite anchor cable without compensatory tensioning according to claim 1, characterized in that: The carrier (5) comprises a carrier plate (51), an extrusion piece (52) and a limiting piece (53); the steel strand (41) passes through both the carrier plate (51) and the limiting piece (53); the extrusion piece (52) is fastened to the steel strand (41), and the extrusion piece (52) is limited between the carrier plate (51) and the limiting piece (53).

9. A tension-compression composite anchor cable without compensatory tensioning according to claim 8, characterized in that: The bearing plate (51) and the limiting plate (53) are connected via bolts and nuts.

10. The tension-compression composite anchor cable without compensatory tensioning according to claim 8, characterized in that: The bearing plate (51) is made of steel.

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