阅读说明：本技术 大跨度网架锚头拉索及弧形网架张紧方法 (Large-span net rack anchor head inhaul cable and arc-shaped net rack tensioning method ) 是由 赵荣华 程文煊 王磊 于 2020-06-05 设计创作，主要内容包括：本发明涉及一种大跨度网架锚头拉索及弧形网架张紧方法,大跨度网架锚头拉索包括第一固定支座,在第一固定支座的前端设置有第一锚头,在第一锚头的前端设置有第二锚头,在第二锚头的前端设置有锚头连接件,在锚头连接件的前端设置有穿心千斤顶,在穿心千斤顶的前端设置有第三锚头,在第一锚头、第二锚头以及第三锚头上分别设有锥形孔,在锥形孔内设置有锁芯,锁芯为多个瓣体合围成的圆锥台,在锁芯中心设有连接孔,钢绞线穿接在穿接孔内。本发明结构简单,便于安装和拆卸,能够重复多次张拉以达到施工要求,能够有效防止钢绞线的滑脱,降低安全风险。(The invention relates to a large-span net rack anchor head cable and an arc net rack tensioning method, wherein the large-span net rack anchor head cable comprises a first fixing support, a first anchor head is arranged at the front end of the first fixing support, a second anchor head is arranged at the front end of the first anchor head, an anchor head connecting piece is arranged at the front end of the second anchor head, a center-penetrating jack is arranged at the front end of the anchor head connecting piece, a third anchor head is arranged at the front end of the center-penetrating jack, conical holes are respectively arranged on the first anchor head, the second anchor head and the third anchor head, a lock cylinder is arranged in each conical hole, the lock cylinder is a conical frustum formed by a plurality of petal bodies in a surrounding mode, a connecting hole is formed in the center of the lock cylinder, and a steel strand penetrates into the corresponding through-penetrating hole. The steel strand tensioning device is simple in structure, convenient to install and disassemble, capable of repeatedly tensioning for multiple times to meet construction requirements, capable of effectively preventing the steel strands from slipping and reducing safety risks.)

1. A large-span net rack anchor head inhaul cable is characterized by comprising a first fixing support, wherein a first anchor head is arranged at the front end of the first fixing support, a second anchor head is arranged at the front end of the first anchor head, an anchor head connecting piece is arranged at the front end of the second anchor head, a penetrating jack is arranged at the front end of the anchor head connecting piece, a third anchor head is arranged at the front end of the penetrating jack, one end of a steel strand sequentially penetrates through the first fixing support, the first anchor head, the second anchor head, the anchor head connecting piece, the penetrating jack and the third anchor head, tapered holes are respectively formed in the first anchor head, the second anchor head and the third anchor head, the large end of each tapered hole is far away from the first fixing support, a lock cylinder is arranged in each tapered hole, the lock cylinder is a conical frustum formed by a plurality of lamella bodies in a surrounding mode, and a connecting hole is formed in the center of the lock cylinder, the steel strand is connected in the through hole in a penetrating mode, and a limiting shaft is arranged between the first anchor head and the second anchor head.

2. The large-span net rack anchor head guy cable according to claim 1, wherein a tooth shape is provided on an inner wall of the connection hole.

3. The large-span net rack anchor head inhaul cable according to claim 1, wherein a groove is provided on an end surface of the anchor head connecting member contacting the second anchor head.

4. The large-span net rack anchor head inhaul cable according to claim 1, wherein the number of the steel stranded wires is two, and the number of the tapered holes in the first anchor head, the second anchor head and the third anchor head is two.

5. The large-span net rack anchor head cable according to claim 1, wherein the lock core is composed of three symmetrical petals around the axis.

6. The large-span net rack anchor head inhaul cable according to claim 1, wherein a second fixing support, a fourth anchor head and a fifth anchor head are arranged at the other end of the steel strand, connecting holes are formed in the fourth anchor head and the fifth anchor head, a lock cylinder is arranged in each connecting hole, a limiting shaft is arranged between the fourth anchor head and the fifth anchor head, and the steel strand penetrates through the second fixing seat, the lock cylinder of the fourth anchor head and the lock cylinder of the fifth anchor head.

7. The arc-shaped net rack tensioning method is characterized by comprising the following steps of:

a. the large-span net rack anchor head inhaul cable is arranged between two ends of an arc net rack needing to be tensioned, the large-span net rack anchor head inhaul cable comprises a first fixing support, a first anchor head is arranged at the front end of the first fixing support, a second anchor head is arranged at the front end of the first anchor head, an anchor head connecting piece is arranged at the front end of the second anchor head, a center penetrating jack is arranged at the front end of the anchor head connecting piece, a third anchor head is arranged at the front end of the center penetrating jack, one end of a steel strand sequentially penetrates through the first fixing support, the first anchor head, the second anchor head, the anchor head connecting piece, the center penetrating jack and the third anchor head, tapered holes are respectively arranged on the first anchor head, the second anchor head and the third anchor head, the large end of each tapered hole is one end far away from the first fixing support, a lock cylinder is arranged in each tapered hole, and the lock cylinder is a plurality of cone tables formed by surrounding of a plurality of petals, a connecting hole is formed in the center of the lock cylinder, the steel strand is connected in the through hole in a penetrating manner, a limiting shaft is arranged between the first anchor head and the second anchor head, a first fixing support is welded to the lower portion of one end of the arc-shaped net rack, and the other end of the steel strand is fixed at a preset tensioning position;

b. starting the center-penetrating jack to extend, so that a cylinder shaft of the center-penetrating jack extends to push a third anchor head to move forwards, and a lock cylinder of the third anchor head automatically locks and drives the steel strand to synchronously move for tensioning;

c. the core penetrating jack stops extending after reaching the full stroke, the lock cylinder of the first anchor head and the lock cylinder of the second anchor head are righted, the core penetrating jack is started to contract, and the steel strand is automatically locked by the lock cylinder of the first anchor head and the lock cylinder of the second anchor head;

d. after the penetrating jack is completely contracted, loosening a lock cylinder of a third anchor head, moving the third anchor head to the end part close to the penetrating jack, and righting the lock cylinder of the third anchor head;

e. and d, repeating the steps b to d until the tensioning length of the steel strand reaches the construction requirement.

8. A curved net mount tensioning method according to claim 7, wherein the fixing supports are welded to the ball nodes of the net mount structure.

9. A method of tensioning a curved net rack according to claim 7, wherein a tooth form is provided on an inner wall of the coupling hole.

10. A curved net rack tensioning method according to claim 7, wherein a groove is provided on an end surface of the anchor head connecting member contacting the second anchor head.

Technical Field

The invention relates to a large-span net rack tensioning device, in particular to a large-span net rack anchor head inhaul cable and an arc-shaped net rack tensioning method.

Background

The large-span net rack is in the construction of assembling, especially welds the ball net rack, because its dead weight reason can lead to the span grow, can't take a seat when leading to the later stage installation and take its expansion measure of effective restriction in the work progress. At present, all use wire rope to connect the both sides of large-span rack taut in the large-span rack work progress, the both sides at spatial structure are fixed respectively at the wire rope both ends, wire rope's one end is passed through the jack and is stretched, but receive the influence of rack member, the space is smaller, the stroke of jack can receive the space influence, in the tensioning process, lead to the jack skew, the position atress that wire rope and jack are connected is inhomogeneous, wearing and tearing are serious, when the condition is serious, the slippage can appear in wire rope, spatial structure can not effectual taut, influence normal construction, and the easy danger that takes place, increase the risk of construction.

Disclosure of Invention

The invention aims to provide a large-span net rack anchor head inhaul cable and an arc-shaped net rack tensioning method, and aims to solve the problems that construction quality cannot be guaranteed and construction risks exist due to the fact that a steel wire rope easily slips when an existing large-span net rack is tensioned.

The invention is realized by the following steps: a large-span net rack anchor head inhaul cable comprises a first fixing support, wherein a first anchor head is arranged at the front end of the first fixing support, a second anchor head is arranged at the front end of the first anchor head, an anchor head connecting piece is arranged at the front end of the second anchor head, a center penetrating jack is arranged at the front end of the anchor head connecting piece, a third anchor head is arranged at the front end of the center penetrating jack, one end of a steel strand sequentially penetrates through the first fixing support, the first anchor head, the second anchor head, the anchor head connecting piece, the center penetrating jack and the third anchor head, tapered holes are respectively formed in the first anchor head, the second anchor head and the third anchor head, the large end of each tapered hole is one end far away from the first fixing support, a lock cylinder is arranged in each tapered hole, the lock cylinder is a cone frustum formed by combining a plurality of petal bodies, a connecting hole is formed in the center of the lock cylinder, and the steel strand is connected in the center penetrating connecting hole, and a limiting shaft is arranged between the first anchor head and the second anchor head.

The inner wall of the connecting hole is provided with a tooth shape.

And a groove is arranged on the end surface of the anchor head connecting piece, which is contacted with the second anchor head.

The number of the steel strands is two, and the number of the conical holes in the first anchor head, the second anchor head and the third anchor head is two.

The lock core is composed of three petal bodies which are symmetrical around the axis.

The other end of the steel strand is provided with a second fixed support, a fourth anchor head and a fifth anchor head, connecting holes are formed in the fourth anchor head and the fifth anchor head, lock cylinders are arranged in the connecting holes, a limiting shaft is arranged between the fourth anchor head and the fifth anchor head, and the steel strand penetrates through the second fixed seat, the lock cylinders of the fourth anchor head and the lock cylinders of the fifth anchor head.

The invention also discloses an arc-shaped net rack tensioning method, which comprises the following steps:

a. the large-span net rack anchor head inhaul cable is arranged between two ends of an arc net rack needing to be tensioned, the large-span net rack anchor head inhaul cable comprises a first fixing support, a first anchor head is arranged at the front end of the first fixing support, a second anchor head is arranged at the front end of the first anchor head, an anchor head connecting piece is arranged at the front end of the second anchor head, a center penetrating jack is arranged at the front end of the anchor head connecting piece, a third anchor head is arranged at the front end of the center penetrating jack, one end of a steel strand sequentially penetrates through the first fixing support, the first anchor head, the second anchor head, the anchor head connecting piece, the center penetrating jack and the third anchor head, tapered holes are respectively arranged on the first anchor head, the second anchor head and the third anchor head, the large end of each tapered hole is one end far away from the first fixing support, a lock cylinder is arranged in each tapered hole, and the lock cylinder is a plurality of cone tables formed by surrounding of a plurality of petals, the center of the lock cylinder is provided with a connecting hole, the steel strand is connected in the through hole in a penetrating manner, a limiting shaft is arranged between the first anchor head and the second anchor head, the first fixing support is welded to the lower portion of one end of the arc-shaped net rack, and the other end of the steel strand is fixed at a preset tensioning position.

b. And starting the center-penetrating jack to extend, so that the cylinder shaft extends to push the third anchor head to move forwards, and the lock cylinder of the third anchor head automatically locks and drives the steel strand to synchronously move for tensioning.

c. And the core penetrating jack stops extending after reaching the full stroke, the lock cylinder of the first anchor head and the lock cylinder of the second anchor head are righted, the core penetrating jack is started to contract, and the steel strand is automatically locked by the lock cylinder of the first anchor head and the lock cylinder of the second anchor head.

d. And after the penetrating jack is completely contracted, loosening the lock cylinder of the third anchor head, moving the third anchor head to the end part close to the penetrating jack, and righting the lock cylinder of the third anchor head.

e. And d, repeating the steps b to d until the tensioning length of the steel strand reaches the construction requirement.

The fixed support is welded on the ball joint of the grid structure.

The inner wall of the connecting hole is provided with a tooth shape.

And a groove is arranged on the end surface of the anchor head connecting piece, which is contacted with the second anchor head.

The steel strand is fixed on the first anchor head, the second anchor head or the third anchor head through the lock cylinder, and when the steel strand moves towards the small end direction of the tapered hole or tends to move towards the small end direction, the lock cylinder is tightened in the tapered hole, so that the steel strand is fixed; when the steel strand wires move towards the big end of the taper hole, the lock cylinder is taken out of the taper hole, the lock cylinder is automatically opened and separated into a plurality of petal bodies, and the steel strand wires can move relative to the lock cylinder. When the steel strand is tensioned, the penetrating jack extends, the third anchor head is pushed by the penetrating jack to move forwards, the steel strand has a tendency of moving towards the small end of the tapered hole for the lock cylinder of the third anchor head, the lock cylinder is tightened by friction force between the steel strand and the lock cylinder, the steel strand is fixed on the third anchor head and moves forwards along with the third anchor head, the steel strand moves towards the large end of the tapered hole relative to the first anchor head and the second anchor head, the lock cylinders of the first anchor head and the second anchor head are automatically opened under the driving of the steel strand, and the steel strand can freely pass through the first anchor head and the second anchor head. When the center-penetrating jack contracts, the steel strand has a tendency of returning, the steel strand drives the lock cylinders of the first anchor head and the second anchor head to move towards the small end of the tapered hole, the lock cylinders automatically tighten, the first anchor head, the second anchor head and the steel strand are fixed together, the lock cylinder of the third anchor head is manually opened, and the third anchor head is moved to the end part of the contracted center-penetrating jack to prepare for next tensioning.

The steel strand tensioning device is simple in structure, convenient to install and disassemble, capable of repeatedly tensioning for multiple times to meet construction requirements, capable of effectively preventing the steel strands from slipping and reducing safety risks.

Drawings

Fig. 1 is a schematic view of the initial state of the anchor head cable of the large-span net rack.

Fig. 2 is a schematic view of the tension state of the anchor head cable of the large-span net rack.

Figure 3 is a schematic view of a first or second anchor head of the present invention.

Fig. 4 is a schematic view of a lock cylinder of the present invention.

Fig. 5 is a schematic view of the construction of tensioning the large-span net rack.

Fig. 6 is a partially enlarged view of fig. 5.

Fig. 7 is a partially enlarged view of fig. 5.

In the figure: 1. steel strand wires; 2. a first fixed support; 3. a first anchor head; 4. a limiting shaft; 5. a second anchor head; 6. an anchor head connector; 7. a center-penetrating jack; 8. a third anchor head; 9. a tapered hole; 10. a lock cylinder; 11. connecting holes; 12. a second fixed support; 13. a fourth anchor head; 14. a fifth anchor head; 15. an arc-shaped net rack; 10-1 and a flap body.

Detailed Description

As shown in fig. 1 and 2, the anchor head cable for the large-span net rack of the invention comprises a first fixed support 2, a first anchor head 3 is arranged at the front end of the first fixed support 2, a second anchor head 5 is arranged at the front end of the first anchor head 3, an anchor head connecting piece 6 is arranged at the front end of the second anchor head 5, a center-penetrating jack 7 is arranged at the front end of the anchor head connecting piece 6, a third anchor head 8 is arranged at the front end of the center-penetrating jack 7, one end of a steel strand 1 sequentially penetrates through the first fixed support 2, the first anchor head 3, the second anchor head 5, the anchor head connecting piece 6, the center-penetrating jack 7 and the third anchor head 8, tapered holes 9 are respectively arranged on the first anchor head 3, the second anchor head 5 and the third anchor head 8, the large end of the tapered hole 9 is the end far away from the first fixed support 2, a lock cylinder 10 is arranged in the tapered hole 9, the lock cylinder 10 is a cone frustum surrounded by a plurality of cone bodies 10-1, a connecting hole 11 is formed in the center of the lock cylinder 10, the steel strand 1 penetrates through the penetrating connecting hole, and a limiting shaft 4 is arranged between the first anchor head 3 and the second anchor head 5.

The fixed support is provided with a through hole through which the steel strand 1 can freely pass. The axis of the penetrating jack 7 is a cavity, and the steel strand 1 penetrates through the cavity, so that the pressure applied to the penetrating jack 7 is along the axis direction of the penetrating jack, and the penetrating jack 7 is prevented from deflecting in the working process.

As shown in fig. 4, the lock core 10 may be formed by joining more than two petals 10-1, and most preferably, the lock core 10 is formed by three petals 10-1 which are symmetrical around the axis, and the three petals 10-1 are joined to form the circular truncated cone-shaped lock core 10.

Be equipped with the tooth type on the inner wall of connecting hole 11, when lock core 10 tightened up, in tooth type embedding steel strand wires 1, increase the frictional force between lock core 10 and the steel strand wires 1 to with the more firm fixed of steel strand wires 1 and lock core 10 together, can effectually prevent the slippage of steel strand wires 1.

A limiting shaft 4 is arranged between the first anchor head 3 and the second anchor head 5, the first anchor head 3 and the second anchor head 5 are separated by the limiting shaft 4 and are not in contact with each other, a certain distance exists between the first anchor head 3 and the second anchor head 5, and therefore the lock cylinder 10 can move a small distance towards the large end of the tapered hole 9, and the lock cylinder 10 can be opened into a plurality of petal bodies 10-1 in a space. The end face of the anchor head connecting piece 6, which is in contact with the second anchor head 5, is provided with a groove, and the lock cylinder 10 of the second anchor head 5 can move a small distance towards the large end of the tapered hole 9, so that the lock cylinder 10 can be opened into a plurality of clacks 10-1 in space.

In order to ensure safety and reliability, two steel strands 1 are connected between two points of the grid structure at the same time, and two conical holes 9 are formed in the first anchor head 3, the second anchor head 5 and the third anchor head 8 (as shown in fig. 3), so that the two steel strands 1 are connected in a penetrating manner at the same time. In order to ensure that the stress distribution between the first anchor head 3 and the second anchor head 5 is uniform, the four corners between the first anchor head 3 and the second anchor head 5 are provided with the limiting shafts 4, and the two ends of the limiting shafts 4 are respectively inserted into the first anchor head 3 and the second anchor head 5, so that the connection of the first anchor head 3, the second anchor head 5 and the limiting shafts 4 is firmer.

The other end of the steel strand 1 is also fixed on the grid structure through a similar anchor head connecting structure, the other end of the steel strand 1 is provided with a second fixing support 12, a fourth anchor head 13 and a fifth anchor head 14, the second fixing support 12 is welded and fixed on a ball joint of the grid structure, the structures of the fourth anchor head 13 and the fifth anchor head 14 are the same as those of the first anchor head 3 and the anchor head, the fourth anchor head 13 and the fifth anchor head 14 are provided with connecting holes 11, a lock cylinder 10 is arranged in the connecting holes 11, a limiting shaft 4 is arranged between the fourth anchor head 13 and the fifth anchor head 14, and the steel strand 1 passes through the second fixing seat, the lock cylinder 10 of the fourth anchor head 13 and the lock cylinder 10 of the fifth anchor head 14. Since the steel strand 1 at this end is always subjected to a pulling force in the direction of the small end of the tapered hole 9, the steel strand 1 is always fixedly connected to the fourth anchor head 13 and the fifth anchor head 14 by the lock cylinder 10.

After tensioning is completed, the tensile force of the steel strand 1 needs to be borne by the anchor heads for a long time, so that the first anchor head 3 and the second anchor head 5 are arranged at one end (as shown in fig. 6), the fourth anchor head 13 and the fifth anchor head 14 are arranged at the other end (as shown in fig. 7), two ends of the steel strand 1 are fixed by the two anchor heads respectively, the firmness of the steel strand 1 is improved, and the steel strand 1 is prevented from slipping off in the installation process of the grid structure.

As shown in fig. 5, the invention also discloses a method for tensioning the arc-shaped net rack 15, which comprises the following steps:

a. the large-span net rack anchor head inhaul cable is arranged between two ends of an arc net rack 15 to be tensioned, the large-span net rack anchor head inhaul cable comprises a first fixing support 2, a first anchor head 3 is arranged at the front end of the first fixing support 2, a second anchor head 5 is arranged at the front end of the first anchor head 3, an anchor head connecting piece 6 is arranged at the front end of the second anchor head 5, a penetrating jack 7 is arranged at the front end of the anchor head connecting piece 6, a third anchor head 8 is arranged at the front end of the penetrating jack 7, one end of a steel strand 1 sequentially penetrates through the first fixing support 2, the first anchor head 3, the second anchor head 5, the anchor head connecting piece 6, the penetrating jack 7 and the third anchor head 8, tapered holes 9 are respectively arranged on the first anchor head 3, the second anchor head 5 and the third anchor head 8, the large end of the tapered hole 9 is the end far away from the first fixing support 2, a lock cylinder 10 is arranged in the tapered hole 9, the lock core 10 is a truncated cone surrounded by a plurality of petal bodies 10-1, a connecting hole 11 is arranged in the center of the lock core 10, the steel strand 1 is connected in the through hole in a penetrating way, a limiting shaft 4 is arranged between the first anchor head 3 and the second anchor head 5, the first fixed support 2 is welded on the lower part of one end of the arc-shaped net rack 15, and the other end of the steel strand 1 is fixed at a preset tensioning position.

b. And starting the center-penetrating jack 7 to extend, so that the cylinder shaft extends to push the third anchor head 8 to move forwards, and the lock cylinder 10 of the third anchor head 8 automatically locks and drives the steel strand 1 to synchronously move for tensioning.

c. And the penetrating jack 7 stops extending after reaching the full stroke, the lock cylinder 10 of the first anchor head 3 and the lock cylinder 10 of the second anchor head 5 are righted, the penetrating jack 7 is started to contract, and the lock cylinder 10 of the first anchor head 3 and the lock cylinder 10 of the second anchor head 5 automatically lock the steel strand 1.

d. After the penetrating jack 7 is completely contracted, the lock cylinder 10 of the third anchor head 8 is loosened, the third anchor head 8 is moved to the end part close to the penetrating jack 7, and the lock cylinder 10 of the third anchor head 8 is righted.

e. And (d) repeating the steps b to d until the tensioning length of the steel strand 1 meets the construction requirement.

The concrete structure of the large-span net rack anchor head cable is as described above, the cable fixing point on the large-span net rack structure is determined through calculation and experience, the large-span net rack anchor head cable is installed on the large-span net rack structure, and the steel strand 1 can be tensioned through multiple times of expansion and contraction of the hollow hydraulic cylinder, so that the tensioned length of the steel strand 1 can meet the required length requirement.

According to the invention, the steel strand 1 is fixed on the first anchor head 3, the second anchor head 5 or the third anchor head 8 through the lock cylinder 10, and when the steel strand 1 moves towards the small end direction of the tapered hole 9 or tends to move towards the small end direction, the lock cylinder 10 is tightened in the tapered hole 9, so that the steel strand 1 is fixed; when the steel strand 1 moves towards the large end of the tapered hole 9, the lock cylinder 10 is taken out of the tapered hole 9, the lock cylinder 10 is automatically opened and separated into a plurality of petal bodies 10-1, and the steel strand 1 can move relative to the lock cylinder 10. When the steel strand 1 is tensioned, the penetrating jack 7 extends, the third anchor head 8 is pushed by the penetrating jack 7 to move forwards, for the lock cylinder 10 of the third anchor head 8, the steel strand 1 tends to move towards the small end of the tapered hole 9, the lock cylinder 10 is tightened by friction force between the steel strand 1 and the lock cylinder 10, the steel strand 1 is fixed on the third anchor head 8, the steel strand 1 moves forwards along with the third anchor head 8, at the moment, the steel strand 1 moves towards the large end of the tapered hole 9 relative to the first anchor head 3 and the second anchor head 5, the first anchor head 3 and the lock cylinder 10 of the second anchor head 5 are automatically opened under the driving of the steel strand 1, and the steel strand 1 can freely pass through the first anchor head 3 and the second anchor head 5. When the piercing jack 7 contracts, the steel strand 1 tends to retreat, the steel strand 1 drives the lock cylinders 10 of the first anchor head 3 and the second anchor head 5 to move towards the small end of the tapered hole 9, the lock cylinders 10 automatically tighten, the first anchor head 3, the second anchor head 5 and the steel strand 1 are fixed together, the lock cylinder 10 of the third anchor head 8 is manually opened, and the third anchor head 8 is moved to the end part of the contracted piercing jack 7 to prepare for next tensioning.