JPH08144274A - Permanent anchor execution method and hanging packer - Google Patents

Abstract

PURPOSE: To make it possible to execute an upper inclination type permanent anchor without lowering working efficiency. CONSTITUTION: A hanging packer 24 is expanded at the bottom of an anchor hole 44 and is maintained. An anchor tendon 10 is connected to one end of a wire rope 36 wound to a pulley 38 of the hanging packer 24, and the anchor tendon is hung inside the anchor hole 44 under the traction of the other end of the wire rope.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a permanent wire for tensioning and fixing a tension member by inserting an uncurtain dong, which incorporates unbonded PC steel strands as a tension member, into an anchor hole and fixing it under the solidification of grout. Anchor construction method, especially
The present invention relates to a method for constructing a permanent anchor of an upward slanting type in which an uncurtain dong is inserted and fixed in an upward anchor hole, and a suspension packer therefor.

[0002]

2. Description of the Related Art Generally, ground and various structures (ground, etc.)
Are reinforced by the anchoring of permanent anchors. In a permanent anchor, for example, an uncurtain don formed by incorporating a tension material or a grout hose into a corrugated sheath is inserted and fixed in an anchor hole in the ground, etc., and the ground is reinforced by the tension and fixation of the tension material to the ground. Has been done.

Permanent anchors are generally provided as a downward sloping type that slopes downward toward the tip. In such a permanent anchor, the uncurtain don is pushed into the anchor hole that is formed by inclining downward, by the manual work of the operator, etc., and the grout that is pressure-injected inside and outside the uncurtain don is solidified. It is fixed to the ground.

[0004]

By the way, the above-mentioned permanent anchor is also used for the purpose of reinforcing the rock mass on the peripheral surface of the cavity such as a tunnel. In this case, the ceiling portion of the cavity or the like is provided as an upward inclined type that inclines upward toward the tip.

However, since the rigidity of the wire is lower than that of unbonded PC steel which is generally used as a tension material, when the uncurtain don is inserted upward, its straightness cannot be sufficiently maintained, and the uncurtain don is not maintained. Is easy to turn on the way. That is, the insertion work of the uncurtain dong is likely to be difficult.

Further, after inserting the uncurtain dong into the upwardly inclined anchor hole, the uncurtain dong must be supported from below for the purpose of preventing the drop from falling until the grout is solidified, so the workability after insertion is reduced.

Further, in the upwardly inclined permanent anchor, since the opening of the anchor hole is opened downward, the grout injected under pressure into the anchor hole easily leaks from the opening before solidification, and the ground There is a possibility that the fixing force of the uncurtain dong against the above may be reduced.

That is, in the known construction method, it is difficult to construct the upwardly inclined permanent anchor.

An object of the present invention is to provide a permanent anchor construction method capable of constructing an upwardly inclined permanent anchor without lowering workability.

It is another object of the present invention to provide a suspension packer used as a suspension support in the permanent anchor construction method.

[0011]

In order to achieve this object, according to the permanent anchor construction method of the present invention, a suspension packer with a support piece is inserted to the bottom of the anchor hole,
Cement milk is inflated by pressure injection, and the suspension packer is held at the position of the bottom of the anchor hole under the frictional force generated between the outer peripheral surface of the suspension packer and the peripheral surface of the anchor hole to form a suspension support. Then, an uncurtain don is connected to one end of the flexible wire wound around the supporting piece of the hanging packer so that the uncurtain don can be suspended in the anchor hole under the pulling of the other end of the flexible wire. .

[0012]

In this method, it is sufficient to push the suspension packer into the bottom of the anchor hole and inflate it, so that the suspension support can be easily loaded. Then, since it is sufficient to pull the uncurtain don into the anchor hole by pulling the flexible wire wound around the supporting piece of the hanging packer, the uncurtain don can be easily inserted and held at the insertion position.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In the permanent anchor construction method according to the present invention, the uncurtain dong is inserted into the anchor hole by the suspension by the suspension support.

As shown in FIG. 1, the uncurtain don 10
Is preassembled, for example, by inserting a tension member made of a plurality of unbonded PC steel wires 12 into a corrugated sheath 16 and the like together with grout hoses 14-1 to 14-3 and the like which will be described later while positioning with a spacer or the like. . In addition, reference numerals 18 and 2
Reference numeral 0 denotes a seal disk for stopping water, and the water stop material 22 is injected between the seal disks to perform the water stop treatment at the tip portion of the uncurtain don 10.

In the present invention, a hanging packer 24 with a supporting piece is used as the hanging support. FIG.
As shown in FIG. 3, a suspension packer (suspension support) 24
Is formed, for example, by arranging and fixing a bag-shaped cloth packer 26 having elasticity in the weft direction around a pipe-shaped core material 28 having a predetermined length.

As the cloth packer 26, for example, a known packer composed of a seamless cloth, a grout jacket or the like can be used. The cloth packer can be used for each end portion of the steel wire material 30 such as a wire through a water blocking material such as butyl rubber. It is fixed to the core material 28 by tightening. The core material 28 is formed of, for example, a steel pipe or a vinyl chloride pipe, and a plurality of spacers 29 are provided on the outer peripheral surface of each end portion of the core material in equal intervals.

Then, for example, one end of the substantially L-shaped pipe member 32 is communicated with the inside of the cloth packer 26 through the insertion hole 28a of the core member 28.

In such a suspension packer 24, cement milk 34 from an injection hose 33 connected to a pipe 32 is used.
Under pressure injection, the cloth packer 24 is expanded in the weft direction, that is, in the radial direction of the core material 28.

As shown in FIGS. 2 and 3, the suspension packer 24 is formed with a support piece 38 for movably supporting a flexible wire, for example, a wire rope 36. As the support piece 38, for example, a pulley can be used,
The pulley is the terminal 40a of the hook 40 that is locked to one end of the core material 28.
It is rotatably installed. And hook 36 at one end
A wire rope (flexible wire) 36 having a is wound around a pulley.

In the method of constructing a permanent anchor of the present invention, such a suspension packer 24 with a supporting piece is a long object which is flexible and linear when it is reduced, as shown by the alternate long and short dash line in FIG. It is inserted into the bottom portion of the anchor hole 44 of the ground 42 using a PC steel strand or the like. The anchor hole 44 is formed as an upwardly inclined type that is inclined upward toward the tip.

Then, the cement milk 34 is pressure-injected into the cloth packer 26 of the hanging packer through the injection hose 33, and the cloth packer is inflated as shown by the solid line in FIG.

Since the cloth packer 26 expands while being deformed according to the shape of the anchor hole 44 under the pressure injection of the cement milk 34, the outer surface of the cloth packer is higher than the peripheral surface of the anchor hole. Adhered under pressure. That is, when the cloth packer 26 expands inside the anchor hole 44, a high frictional force is generated between the cloth packer outer peripheral surface and the anchor hole peripheral surface.
That is, the suspension packer 24 is held in the anchor hole.

In the present invention, the anchor hole
This hanging packer 24 held at the bottom of the 44 is used as a hanging support, and the uncurtain don 10 is placed in the anchor hole.
Is hanging.

In the hanging packer 24, the length of the cloth packer 26 is proportional to the magnitude of the frictional force obtained between the cloth packer 26 and the peripheral surface of the anchor hole 44, that is, the weight of the uncurtain don 10 that can be supported. To do. For example, when the lightweight uncurtain don 10 of 200 to 300 kg is suspended, the length of the cloth packer 26 is set to about 50 cm.

As shown in FIG. 4, one end of the wire rope 36 is connected to the tip of the uncurtain don 10 by locking the hook 36a using the ventilation hole 46, for example. Then, by pulling the other end of the wire rope 36 by a pulling means (not shown) such as a winch, the uncurtain don 10
Are suspended inside the anchor hole 44.

In the present invention, the uncurtain dong 10 is inserted into the anchor hole 44 by suspending the wire rope 36 as it is pulled. That is, unlike the known insertion of the uncurtain don by pushing, according to the anchor construction method of the present invention, since the uncurtain don 10 is inserted into the anchor hole 44 by suspending the tip, the anchor is anchored in the upwardly inclined anchor hole. Even when the tendon is inserted, the uncurtain don can be surely prevented from being bent during the insertion, and the operation of inserting the uncurtain don can be surely improved.

When the pulling means is stopped, the uncurtain dong 10 is held at the corresponding insertion position. That is, according to this method, even if the operator does not directly support the uncurtain don 10 from below, by stopping the wire rope 36, the uncurtain don can be easily held at the insertion position. From this point, there is no need to complicate and
Workability is improved.

Here, in the present invention, as shown in FIG. 1, the mouth packer 48 is inserted around the uncurtain don 10 by a predetermined length from the opening of the anchor hole 44 and arranged,
It is inflated to close the anchor hole. Mouth packer 48
For example, a known cloth packer similar to the suspension packer 24 can be used, and the cement milk 52 is pressurized and injected through the injection hose 50 and expanded until it comes into close contact with the peripheral surface of the anchor hole 44.

Before the mouth packer 48 expands, as shown in FIG. 1, for example, a grout hose 14-4 is inserted between the mouth packer and the uncurtain don 10. As the grout hose 14-4, for example, a flat pipe having a substantially elliptical cross section can be used, and the grout hose is held between the mouth packer and the uncurtain don 10 under the expansion of the mouth packer 48.

Then, through the grout hose 14-3 and the grout hose 14-4 to which the injection hose 53 is connected,
Inside the uncurtain don 10, and outside the uncurtain don, pressure grouts 54 and 55 are injected into the mouth packer 48, and under the solidification of the grout, the uncurtain don 10,
In other words, the tip of the unbonded PC steel strand 12 is ground 42
Fixed against. In addition, grout hose 14-1, 14-2
Is used as an exhaust hose for letting air escape from the inside and outside of the uncurtain don 10, and makes it possible to smoothly pressurize the grouts 54, 55 by letting air escape from each part.

In such an upwardly inclined type anchor hole 44, when the grout 55 is attempted to be injected to the outside of the uncurtain don 10, the grout normally flows back along the inclination of the anchor hole due to its own weight and tries to leak from the opening. To do. However, in this invention, since the anchor hole 44 is closed by the mouth packer 48, leakage of the grout 55 injected to the outer periphery of the uncurtain don 10 due to the backflow is reliably prevented. Therefore, the grout 55 can be surely injected around the uncurtain don 10, and the tip portion of the unbonded PC steel strand 12 is surely fixed to the ground 42 by the grout.

An anchor hole 44 is used as a suspending support.
Suspended anchor 24 inserted and held in
38, and the wire rope 36 and the like connected to the uncurtain don 10 are integrally solidified by the pressure injection of the grout 55, so that these are discarded members for each work. However, all of them can be obtained at low cost, and there is no problem in construction cost.

After the grouts 54 and 55 are solidified, the grout hoses 14-1 to 14-4 and the injection hoses 33, 50 and 53 are cut near the openings of the anchor holes 44, for example.

After cutting the grout hose or the like, as shown in FIG. 5, for example, a stiffening plate 58 and an anchor plate (bearing plate) 60 together with an accordion connector 62 are anchor holes.
The unbonded PC steel stranded wire 12 of the uncurtain don 10 is placed under the predetermined load by a tensioning device (not shown) or the like. Then, the extension end 12a of the fixing device including the combination of the wedge 64 and the anchor head 66.
Fixing the unbonded PC steel wire 12 while maintaining a predetermined load, and after the head cap 68 is attached, rust preventive oil is injected under pressure to complete the permanent anchor construction process according to the present invention.

As described above, according to the permanent anchor construction method of the present invention, the uncurtain dong 10 can be easily inserted into the anchor hole 44 by suspending it with the wire rope 36, and by stopping the wire rope, Uncurtain don is held in the insertion position. In other words, the uncurtain don 10 can be inserted and held in the anchor hole 44 under the work of easily pulling and stopping the wire rope 36, so that the workability during the construction of the upwardly inclined permanent anchor is surely improved. To be done.

Then, the anchor hole 44 in the mouth packer 48
Since the grout 55 is prevented from leaking from the anchor hole due to the blockage, the grout 55 can be reliably injected and solidified even in the upwardly inclined anchor hole.

Therefore, according to the permanent anchor construction method of the present invention, the upward inclined permanent anchor can be constructed appropriately without complicating the work.

Further, in the present invention, a cloth anchor
A suspension anchor 24 using 26 is used as a suspension support. According to this, the suspending support can be easily formed, and since it is sufficient to inject the cement milk into the cloth packer 26 under pressure, it is possible to easily hold and fix the suspending support in the anchor hole. It does not complicate the work of fixing the embedded support.

Further, when the cloth packer 26 is contracted, it is sufficient to push it into the bottom of the anchor hole 44 with a long object such as PC steel stranded wire, so that the hanging packer can be easily loaded and the work is easy in this respect as well. Can be converted.

If the hanging packer 24 of the present invention is used as a hanging support, it will have a simple structure,
The above permanent anchor construction method can be appropriately performed.

Here, in the embodiment, the method of constructing the upwardly inclined permanent anchor is illustrated, but the method is not limited to the upwardly inclined type, and for example, a horizontal permanent anchor or a downwardly inclined type similar to the conventional one. The present invention may be applied to the construction of a permanent anchor.

For example, when a wire material having no rigidity or linearity, such as aramid fiber, is used as a tension material, straightening of the uncurtain dong cannot be expected at all under pushing,
Even if the anchor hole is inclined downward, it becomes difficult to insert the uncurtain don into the anchor hole. Therefore, if the present invention is applied, the uncurtain don can be easily pulled into the anchor hole under the pulling of the wire rope regardless of the linearity of the uncurtain don. That is, the permanent anchor construction method of the present invention can be particularly effectively used for construction of a permanent anchor using an uncurtain don having a wire material having no rigidity and linearity as a tension material.

Further, in the embodiment, the cloth packer 26
The holding force of the hanging packer 24, that is, the frictional force generated between the cloth packer and the anchor hole 44, is proportional to the area of the contact surface of the cloth packer with respect to the peripheral surface of the anchor hole. Therefore, by increasing the length of the cloth packer
Support for 10 is also possible. That is, the construction method of the present invention can be sufficiently utilized even in the construction of a permanent anchor using a heavy uncurtain don.

Further, although the supporting piece of the suspension packer 24 is exemplified as the pulley 38, it is sufficient if the flexible wire material such as the wire rope 36 is movably supported by winding, so that it is not limited to the pulley. The wire rope may be provided by winding the erection shaft or the ring-shaped piece as a support piece and winding the erection shaft around the erection shaft.

However, if the pulley 38 is used as the supporting piece of the suspension packer 24, the wire rope 36 moves with the rolling of the pulley, so that an excessive frictional force may act between the wire rope and the pulley. The wire rope can be reliably prevented from being damaged.

Further, the pulley (supporting piece) 38 of the hanging packer 24
Is provided at a position projecting from the core material 28, but since it is sufficient if a flexible wire material such as the wire rope 36 can be wound, the pulley may be located inside the core material.

Further, the pulley 38 of the suspension packer 24 is a hook.
It is attached to the core 28 by locking at 40. However, the invention is not limited to this, and the pulley 38 may be directly attached to the core member 28, for example.

In the embodiment, the suspension packer
Although 24 is embodied as a shape having a core material 28, the present invention is not limited to this, and the hanging packer may be formed in a shape in which the core material is omitted, for example.

As can be seen from FIG. 6, in such a hanging packer 124, the hook 140 is directly engaged with one end of the bag-shaped cloth packer 126, and the hook engaging piece 138 is connected with the wire. The rope 36 is wound. Further, the hook 140 is integrally formed with a receiving portion 72 for an elongated object for insertion which receives an end of the elongated object 70 such as a PC steel wire used at the time of insertion.

Then, the injection hose 74 is replaced by the cloth packer 126.
Is connected to the inside of the anchor hole 44, and after the suspension packer 124 is inserted into the anchor hole 44, cement milk is injected from the injection hose.
Inject 34 under pressure, and inflate the cloth packer until it comes into close contact with the peripheral surface of the anchor hole. Such a hanging packer 124
Also, the cloth packer 126 is attached to the peripheral surface of the anchor hole 44.
Since it is held in the anchor hole by the frictional force generated by the close contact of the outer peripheral surface of the same, it functions sufficiently as a suspending support for suspending the uncurtain don 10, as in the suspending packer 24 of the above embodiment.

The above-mentioned embodiments are for explaining the present invention and do not limit the present invention in any way.
It goes without saying that the present invention includes all those which are modified or modified within the technical scope of the present invention.

[0053]

As described above, according to the permanent anchor construction method of the present invention, the uncurtain don is suspended in the anchor hole, so that the uncurtain don can be easily inserted and supported in the upwardly inclined permanent anchor. .

If the gap between the uncurtain don and the anchor hole is closed by the mouth packer, it is possible to reliably prevent the grout from leaking from the anchor hole. From this point as well, the construction of the upwardly inclined permanent anchor is sufficiently possible. Becomes

Further, since it is sufficient for the suspension packer to be pushed in by a long object having flexibility and linearity, the loading work of the suspension packer does not become complicated.

Further, if a cloth packer is used as the mouth packer, the anchor hole is surely closed due to the close contact between the outer peripheral surface of the uncurtain don and the peripheral surface of the anchor hole, so that the anchor can be formed without complicating the structure. It is possible to reliably prevent the grout from leaking from the hole.

If the suspension packer of the present invention is used as a support for suspending, the above-mentioned permanent anchor construction method can be appropriately performed despite the simple structure. The hanging packer needs only to be in close contact with the peripheral surface of the anchor hole due to the expansion caused by the pressure injection of cement milk into the cloth packer, so the cloth packer is placed and fixed around the core material provided with the locking pieces. Alternatively, the core member may be omitted, and the locking piece may be directly attached to the cloth packer.

If the supporting piece of the hanging packer is a pulley, the flexible wire moves as the pulley rolls, so that an excessive frictional force acts between the flexible wire and the pulley. In addition, it is possible to reliably prevent breakage and damage of the flexible wire.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing a time of pressure injection of grout in a permanent anchor construction method according to the present invention.

FIG. 2 is a schematic exploded perspective view of a suspension packer (suspension support) according to the present invention.

FIG. 3 is a schematic vertical cross-sectional view in a state where a suspension packer is held in an anchor hole in the permanent anchor construction method.

FIG. 4 is a schematic vertical cross-sectional view in the process of suspending the uncurtain don in the permanent anchor construction method.

FIG. 5 is a partially broken schematic vertical sectional view showing a head fixing portion of a permanent anchor.

FIG. 6 is a schematic vertical sectional view showing a modified example of the suspension packer in a state of being held in the anchor hole.

[Explanation of symbols]

 10 Uncurtain Don 12 Unbonded PC Steel Twisted wire (tensile material) 24,124 Suspended packer (suspended support tool) 26,126 Cloth packer 28 Core material 36 Wire rope (flexible wire material) 38 Support piece (pulley) 42 Ground, etc. 44 Anchor hole 48 Mouth packer 54, 55 Grout 72 Long object receiving part

Claims (8)

[Claims] 1. A prefabricated uncurtain don is inserted into an anchor hole, and the ground, various structures, etc. are reinforced by solidification of grout injected under pressure into the anchor hole and tension and fixing of the tension member of the uncurtain don. In the permanent anchor construction method, insert a suspension packer with a support piece to the bottom of the anchor hole, inflate it with pressurized injection of cement milk, and suspend it under the frictional force generated between the outer surface of the suspension packer and the peripheral surface of the anchor hole. The packer is held at that position at the bottom of the anchor hole to serve as a hanging support, and the uncurtain don is connected to one end of the flexible wire wound around the supporting piece of the hanging packer and the other end of the flexible wire is pulled. The permanent anchor construction method is characterized in that the uncurtain dong can be suspended in the anchor hole under the condition of. 2. A prefabricated uncurtain don is inserted into an anchor hole, and the ground, various structures, and the like are reinforced by solidifying the grout that is pressure-injected into the anchor hole and tensioning and fixing the tension member of the uncurtain don. In the permanent anchor construction method, insert a suspension packer with a support piece to the bottom of the anchor hole, inflate it with pressurized injection of cement milk, and suspend it under the frictional force generated between the outer surface of the suspension packer and the peripheral surface of the anchor hole. The packer is held at that position at the bottom of the anchor hole to serve as a hanging support, and the uncurtain don is connected to one end of the flexible wire wound around the supporting piece of the hanging packer and the other end of the flexible wire is pulled. Uncurtain don is suspended inside the anchor hole under pressure, and grout is injected under pressure inside and outside the uncurtain don, after solidification of the grout. , A permanent anchor construction method characterized by tensioning and fixing the tension material of Uncurtain Don. 3. A prefabricated uncurtain don is inserted into an anchor hole, and the ground, various structures, etc. are reinforced by solidification of grout that is pressure-injected into the anchor hole and tension and fixing of the tension member of the uncurtain don. In the permanent anchor construction method, insert a suspension packer with a support piece to the bottom of the anchor hole, inflate it with pressurized injection of cement milk, and suspend it under the frictional force generated between the outer surface of the suspension packer and the peripheral surface of the anchor hole. The packer is held at that position at the bottom of the anchor hole to serve as a hanging support, and the uncurtain don is connected to one end of the flexible wire wound around the supporting piece of the hanging packer and the other end of the flexible wire is pulled. The uncurtain pendant is suspended under the anchor hole and the mouth packer that prevents leakage of grout from the anchor hole is uncured. Around the anchor hole by a predetermined distance from the opening of the anchor hole, expand it under pressure injection of cement milk, and inside the uncurtain don and outside the uncurtain don a grout inside the mouth packer. A permanent anchor construction method characterized by injecting pressure respectively, solidifying the grout, and then tensioning and fixing the tension material of the uncurtain don. 4. The permanent anchor construction method according to claim 1, wherein the suspension packer is inserted and arranged at the bottom of the anchor hole by being pushed in by a flexible and linear elongated object. 5. The mouth packer is formed of a bag-shaped cloth packer having stretchability in the weft direction, and a grout injection hose for injecting grout around the outer periphery of the uncurtain don penetrates the hollow part of the mouth packer. The permanent anchor construction method according to any one of claims 2 to 4, which is installed side by side. 6. A pipe material in which a bag-shaped cloth packer having stretchability in the weft direction is arranged and fixed around a pipe-shaped core material, and is inserted and fixed through an insertion hole formed in the core material. By injecting cement milk from under pressure, the cloth packer can be expanded, and it is formed with a support piece on which a flexible wire can be wound. The cloth packer expands in the anchor hole. A hanging packer with a support piece, in which the outer peripheral surface of the anchor is closely contacted with the peripheral surface of the anchor hole and the friction force generated by the contact holds the anchor in the anchor hole. 7. A hook having a supporting piece on which a flexible wire can be wound and a receiving portion for a long object for insertion is locked to a bag-shaped cloth packer having stretchability in the weft direction, and communicates. By injecting cement milk from the injection hose under pressure, the cloth packer can be inflated, and the expansion of the cloth packer causes the outer peripheral surface of the cloth packer to come into close contact with the peripheral surface of the anchor hole. A suspension packer with a support piece that is held in the anchor hole by force. 8. A wire rope is used as the flexible wire and a pulley on which the wire rope can be wound is provided as a support piece.
Or the hanging packer described in 7.