JPH08128039A - Anchor construction method - Google Patents

Abstract

PURPOSE: To obtain excellent water-tightness between a casing pipe and a water cut-off part by, in the case of connecting the water cut-off part of a water cut-off box used combinedly with a pedestal to a pedestal part, fastening a push cap attached crownlikely to the inner tube of the water stop part. CONSTITUTION: A casing pipe inserting hole 5 is drilledly provided at the construction position of earth retaining 1, and an inserting pipe 7 is inserted into this hole to fix the pedestal part 13 of a water cut-off box 9 used combinedly with a pedestal to an earth retaining wall 1a through a urethane sponge 11. When a ground 3 is bored with a casing pipe 35, water cut-off rubber packings 39, 41 are transmitted to a cap 43 by friction with the pipe 35, and the pushing cap 43 is move fastened. Thus, in the box 9, the push cap 43 is automatically fastened as the ground 3 is bored with the casing pipe 35 for securing water tightness between the water cut-off rubber packings 39, 41 and the casing pipe 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedestal and water blocking box used when constructing an earth anchor, and an anchor construction method using the box.

[0002]

2. Description of the Related Art Conventionally, for the purpose of holding retaining walls and retaining walls,
The anchor method is widely used. This anchor construction method, water for drilling is fed into the casing pipe connected to the drilling machine, and the ground is drilled with the drilling bit at the tip of the casing pipe to finish the drilling to the desired depth. Primary injection of grout material such as cement milk into the casing pipe, insertion of tensile material such as PC steel wire, and pulling out the casing pipe, pressure injection (secondary injection) of the grout material into the anchor hole. After forming the anchor body in the ground, the end of the tensioned tension member is fixed to the pedestal outside the earth retaining wall, and the casing pipes are sequentially connected according to the drilling depth.

By the way, conventionally, when drilling a casing pipe, the drilling slime (groundwater or drilling scrap) rises along the casing pipe. Therefore, a water-stop box is attached to the outside of the retaining wall to attach the casing pipe and the soil retaining pipe. Water may be stopped from the wall.

However, since the conventional water shut-off box merely serves to stop the water, it is troublesome to replace the tension member with the pedestal at the time of fixing, and it is pointed out that water may come out during the replacement work. It had been.

As a solution to such a problem, Japanese Patent Laid-Open No. 4-198522 discloses a water-stop box that can be used as a pedestal when fixing a tension material and an anchor construction method using the same. There is.

[0006]

However, in such a water shut-off box, the water tightness with the casing pipe inserted into the casing pipe insertion hole of the water shut-off box was not always sufficient.

In addition, the anchor construction method using such a water shut-off box is such that the inside of the casing pipe is closed by a water shut-off packer before the final unit pipe and the unit pipe of the preceding stage are pulled out and collected, and the inlet of the water shut-off box is closed. Water is stopped by injecting a water-stopping material from it, but conventionally cement milk generally used has a W / C (water-cement ratio) of 55% and a specific gravity of about 1.79. Usually uses water glass or a mixture of water glass and cement milk, which have a lower specific gravity than cement milk.

Therefore, when a water-stopping material having such a small specific gravity is injected from the inlet of the water-stopping box, a gel-like water-stopping material solid, which is a reaction between the water-stopping material and cement milk, floats up inside the casing pipe and stops. It has been pointed out that there is a problem that the casing pipe and the water blocking packer cannot be finally collected due to the adhesion and solidification from the water box to the water blocking packer.

The present invention has been devised in view of such circumstances, and is an anchor construction method using a pedestal and water blocking box which is excellent in watertightness with the casing pipe, and is the last casing pipe compared to the conventional one. It is an object of the present invention to provide an anchor method that can be easily pulled out and collected.

[0010]

In order to achieve such an object, an anchoring method according to a first aspect of the present invention relates to a joining plate bolted to a wall surface such as a retaining wall or a retaining wall via a seal member, and a joining plate. A casing pipe insertion hole that is inserted through the plate for installation at the anchor construction angle and has a larger inner diameter than the drill bit installed at the tip of the casing pipe, and is provided in advance at the anchor construction position such as a retaining wall or retaining wall. And an attachment pipe that can be inserted into the connection plate, and cover the end of the insertion pipe inserted into the connection plate, and attach to the connection plate.
A box-shaped pedestal body in which a casing pipe insertion hole with a diameter larger than that of the drilling bit is formed coaxially with the insertion pipe, and a side wall has an outlet for water and earth and sand and an inlet for injecting waterproofing material. The pedestal part of the water-stop box for pedestal and
Insert the above-mentioned insertion pipe into the casing pipe insertion hole provided in the earth retaining wall etc. and bolt it to the wall surface, and the pedestal body can be bolted via the flange part and the left screw is engraved on the outer circumference, the inner circumference A cylindrical water stop inner pipe with a tapered part that is gradually reduced in diameter in the direction of insertion of the casing pipe, and a cylindrical soft pipe that is installed in two layers inside the water stop inner pipe and has an inner diameter smaller than the drilling bit. Rubber packing for water stop and a rubber packing for cylindrical water stop having a smaller inner diameter than the drill bit and a taper part on the outer periphery that matches the taper part formed on the pipe inside the water stop part, and the inside of the water stop part Temporarily attach the water stop part of the pedestal water-stop box that consists of a push cap that is screwed to the tip of the pipe and has a casing pipe insertion hole with a diameter smaller than the hole drill bit to the outer periphery of the casing pipe above the hole drill bit. Stop , With the insertion of the casing pipe into the pedestal part, after tightening the inner pipe of the water blocking part to the pedestal body of the pedestal with the seal member, bolt the drilling slime that rises along the outer periphery of the casing pipe. , Adjusting the amount of water with the valve installed in the discharge port, discharging it and connecting the casing pipes sequentially according to the drilling depth to drill the ground,
At the end of drilling to the desired depth, a mouth packer formed to open and close the inside of the casing pipe by the injection pressure of the grout material to be injected under pressure, and the mounting position of the mouth packer. The cloth bag-like free packer that is located closer to the tip side than the cloth bag-like bag that expands with the grout material injected from the grout material injection hose that is connected to the grout material injection pipe that passes through the mouth packer and closes the anchor hole Insert the tension material attached to the end side,
Next, the casing pipe is repeatedly opened and closed by the mouth packer by pressure injection of grout material into the anchor hole, the anchor body is created in the ground, and the casing pipe is sequentially pulled out and collected. When the free packer protrudes from the tip into the anchor hole, grout material is injected into the free packer and expanded to close the anchor hole and contract the mouth packer, and stop from the injection port for injecting the waterproofing material. While pouring water material, grout material is injected from the rear end of the casing pipe to thrust the casing pipe up and down, and after the injection of the water blocking material, the casing pipe and mouth packer are pulled out and collected, and water is stopped from the pedestal part. After the portion is removed and the grout material is cured, the end portion of the tension material is tensioned to fix it to the pedestal portion.

[0011]

According to the anchor construction method of the first aspect, the pedestal portion of the pedestal / water-stop box is inserted into the casing pipe insertion hole provided in the earth retaining wall or the like and bolted to the wall surface. Temporarily fix the water shut off part of the water shut off box to the outer circumference of the casing pipe above the drill bit, and insert the casing pipe of the water shut off part along with the insertion of the casing pipe into the pedestal part. If the bolts are tightened through, the water blocking material will be connected to the pedestal portion.

Then, the drilling slime that rises along the outer circumference of the casing pipe is discharged by adjusting the amount of water with a valve attached to the discharge port, and the casing pipes are sequentially connected according to the drilling depth to form the ground. After drilling and finishing drilling to the desired depth, insert tension material with mouth packer and free packer into the casing pipe, and pressurize grout material into anchor hole to make casing pipe by mouth packer. By repeatedly opening and closing the inside, an anchor body is created in the ground, the casing pipe is sequentially pulled out and collected, and when the free packer projects from the tip of the last casing pipe into the anchor hole, the grout is put in the free packer. Inject the material and expand it to close the anchor hole and contract the mouth packer, and from the injection port for injecting the waterproofing material. While pouring water material, grout material is injected from the rear end of the casing pipe to thrust the casing pipe up and down.After the injection of the water stop material, the casing pipe and mouth packer are pulled out and collected, and stopped from the pedestal part. Remove the water section.

Then, after curing the grout material, the anchor construction method is completed by tensioning the end portion of the tension material and fixing it to the pedestal portion. According to the construction method of the present invention, as described above, the last casing is used. When the free packer protrudes from the tip of the pipe, the free packer is inflated to close the anchor hole, and the water blocking material is injected from the injection port of the pedestal part, and at the same time, the grout material is injected from the rear end of the casing pipe. Since the casing pipe is thrust while the grout material is discharged from the tip of the pipe, the gel-like solid material of the water-stopping material, which has reacted with the water-stopping material and the grout material, floats up inside the casing pipe and adheres to its inner circumference to be solidified. Never.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 5 show the structure of a pedestal and water blocking box used in an embodiment of the anchor construction method according to claim 1. In FIG. 1, 1 is a soil retaining wall provided on the ground 3, and the soil retaining wall 1 A casing pipe insertion hole 5 is provided in advance at the anchor construction position, and the insertion pipe 7 is inserted into the casing pipe insertion hole 5 so that the pedestal and water blocking box 9 according to the present embodiment is located outside the earth retaining wall 1. Is attached to the wall surface 1a.

The pedestal / waterproof box 9 is connected to a pedestal portion 13 attached to the wall surface 1a of the earth retaining wall 1 via a urethane sponge (sealing member) 11 and the pedestal portion 13 via a rubber packing (sealing member) 15. The pedestal portion 13 includes a joining plate 19 that is bolted to the wall surface 1a through the urethane sponge 11 and an anchoring angle that penetrates the joining plate 19. The main components are the insertion pipe 7 that is inserted and attached, and a box-shaped pedestal body 21 that covers the end portion 7a of the insertion pipe 7 and is attached to the joining plate 19.

The joining plate 19 is shown in FIG.
And, as shown in FIG. 3, the casing pipe insertion hole 5 is made of a single thick rectangular plate material having a size to cover the opening portion, and the mounting bolts 2 are provided in the bolt holes 23 provided at the four corners thereof.
5 is inserted and bolted to the wall surface 1a.

Then, the insertion pipe 7 penetrates through the center of the joining plate 19 and the end portion 7a thereof is joined to the joining plate 19.
The insertion pipe 7 is opened along with the joining plate 1 at an angle such that it can be inserted into the casing pipe insertion hole 5 when the joining plate 19 is fixed to the wall surface 1a.
It is attached to 9.

In FIG. 2, 27 is a hole-in anchor (female portion) provided on the wall surface 1a side, and the mounting bolt 25 is attached to the hole-in anchor 27. Also, the pedestal body 21 attached to the joining plate 19
Is the end portion 7a of the insertion pipe 7 as shown in FIGS.
Left and right side plates 21a and 21b having a substantially triangular shape, which are erected so as to be opposed to each other on the plate 19 for joining, and a swash plate 21c laid between the side plates 21a and 21b in parallel with the insertion pipe 7.
A horizontal plate 21d orthogonal to the joining plate 19, and a side plate 21d arranged in a direction orthogonal to the insertion pipe 7.
It is formed by a and 21b, a swash plate 21c, and a square-shaped cover plate 21e attached to one side of the horizontal plate 21d to form a box shape.

The swash plate 21c is provided with a hole 29 for discharging water for drilling and sand, and an inlet 31 for injecting a water blocking material (instant binding material) is installed in parallel with one side plate 21a. A casing pipe insertion hole 33 having a diameter larger than that of a drill bit described later is formed in the cover plate 21e coaxially with the insertion pipe 7, and the casing pipe 35 is inserted into the insertion pipe 7 through the casing pipe insertion hole 33. Is designed to be inserted.

On the other hand, as shown in FIGS. 1 and 2, the water shutoff portion 17 has a cylindrical water shutoff portion inner pipe 37 connected to the lid plate 21e of the pedestal body 21, and a water shutoff portion inner pipe 37. Cylindrical soft and hard rubber packings 39, 41 having a taper portion 41 'fitted on two layers and having a taper portion 37' formed on the water stop inner tube 37, and a water stop. A push cap 43 attached to the tip of the internal pipe 37 is a constituent element, and a flange member 45 having the same shape as the lid plate 21e is attached to the lower end of the water shut internal pipe 37. Then, by bolting the flange member 45 to the cover plate 21e, the water shut-off portion inner pipe 37 can be connected to the pedestal body 21.

1 and 2 are provided on the outer periphery of the water shut-off inner pipe 37.
And as shown in FIG. 4, the left screw 47 is engraved,
A taper portion 49 is formed on the inner circumference thereof, the diameter of which is gradually reduced in the insertion direction of the casing pipe 35, and the water blocking rubber packings 39 and 41 are attached in two layers in contact with the inner circumference. Both of the water blocking rubber packings 39 and 41 are formed with an inner diameter smaller than that of a drill bit described later.

A push cap 43 is screwed onto the tip of the inner pipe 37 of the water shut off portion and is capped, and a casing pipe insertion hole 51 having a diameter smaller than that of the drill bit is formed on the push cap 43 and the insertion pipe 7. It is provided on the same axis. Then, by tightening the push cap 43,
The water blocking rubber packings 39 and 41 are respectively deformed inward and pressed against the outer circumference of the casing pipe 35. Generally, the drilling of the ground 3 by the casing pipe 35 is left rotation.

Therefore, after the worker tightens the push cap 43 that covers the inner pipe 37 of the water stop portion to press the rubber gaskets 39 and 41 for water stop against the outer periphery of the casing pipe 35, the ground 3 is covered by the casing pipe 35. When the holes are drilled, the rubber packing 39 for waterproofing is rubbed by friction with the casing pipe 35.
41 pushes the rotation of the casing pipe 35 and caps 43
The push cap 43 is further tightened.

Therefore, the above-mentioned pedestal and water blocking box 9 is
With the drilling of the ground 3 by the casing pipe 35, the push cap 43 is automatically tightened, and the watertightness between the water blocking rubber packings 39 and 41 and the casing pipe 35 is reliably achieved.

When the pushing cap 43 is tightened to some extent by the casing pipe 35, slippage occurs between the casing pipe 35 and the water blocking rubber packing 39, so that the pushing cap 43 is constantly pushed during drilling. It is not tightened by the rotation of.

The water stop portion 17 is constructed in this way,
As shown in FIG. 5, the water stop portion 17 is temporarily fixed to the outer periphery of the casing pipe 35 above the drill bit 53, and the pedestal portion 1
The flange member 45 is bolted to the pedestal body 21 of the pedestal portion 13 to be connected with the insertion of the casing pipe 35 into the pedestal 3.

A pedestal and water-stop box 9 used in this embodiment
Is constructed in this way, and an embodiment of the anchor construction method according to claim 1 is constructed as follows using such a pedestal and water blocking box 9.

First, the soil retaining wall 1 is provided in the ground 3 to construct a connecting wall by a method similar to the conventional method, and then the ground in the connecting wall is excavated. Then, as shown in FIG. 6, when the ground 3'in the connecting wall is excavated to the anchor construction position, a casing pipe insertion hole 5 is formed at the anchor construction position of the soil retaining wall 1 using a core cutter (not shown). Set up.

Then, the insertion pipe 7 is inserted into the casing pipe insertion hole 5, and the bonding plate 19 is bolted to the wall surface 1a of the earth retaining wall 1 with the urethane sponge 11 interposed therebetween, so that the water blocking box 9 for the pedestal also serves. The pedestal 13 is fixed.

On the other hand, as shown in FIG. 7, a boring bit 53 is attached to the tip of the casing pipe 35 connected to the boring machine. Prior to the attachment of the boring bit 53, the pedestal / waterproof box 9 is stopped. The water portion 17 is preliminarily drilled with a bit 53
It is temporarily fixed to the outer circumference of the upper casing pipe 35.

Next, as shown in FIG. 7, the casing pipe 35 fitted with the drill bit 53 is attached to the cover plate 2 of the pedestal portion 13.
The casing pipe insertion hole 35 provided in 1e is inserted into the casing pipe insertion hole 5 through the insertion pipe 7, and the water blocking portion inner pipe 37 of the water blocking portion 17 is attached to the cover plate 21e via the flange member 45. The packing 15 is sandwiched and bolted to connect the water stop portion 17 to the pedestal portion 13 as shown in FIG.

After that, as shown in FIG. 9, the drilling water W is fed into the casing pipe 35, and the casing pipes 35 are sequentially connected in the same manner as in the conventional case, so that the ground 3 is drilled.
Drill at 3. The drilling slime W'which rises along the outer periphery of the casing pipe 35 is discharged by adjusting the amount of water with a valve 55 attached to the discharge port 29 as shown in FIG.

Further, as described above, since the casing pipe 35 is rotated counterclockwise at the time of drilling, the water blocking portion 17 is attached to the pedestal portion 1.
When connecting to 3, the operator caps the push cap 43 on the water blocking portion inner pipe 37 and lightly presses the water blocking rubber packings 39 and 41 onto the outer periphery of the casing pipe 35.
As the casing pipe 35 drills the ground 3, the water blocking rubber packings 39 and 41 of the water blocking portion 17 transmit the rotation of the casing pipe 35 to the pushing cap 43 by friction with the casing pipe 35, and the pushing cap 43 Further tightening ensures the sealing property with the casing pipe 35.

After finishing drilling to a desired depth, a grout material such as cement milk is primarily injected into the casing pipe 35, and the grout is pressurized and injected into the casing pipe 35 as shown in FIG. A tension member 61 having a mouth end packer 57 and a cloth bag-like free packer 59 configured to open and close the inside of the casing pipe 35 by the material injection pressure at the rear end side is inserted.

The mouth packer 57 and the free packer 5
No. 9 has been proposed by the present applicant in Japanese Patent Application No. 5-26673, and its configuration will be described below with reference to FIGS. 11 to 19.

As shown in FIG. 11, the mouth packer 57 expands by injecting compressed air having a pressure higher than the pressurized water pressure from the anchor hole 63 to close the casing pipe 35, and at a pressure higher than the pressurized water pressure. A rubber packer formed so as to contract by the injection pressure of the grout material injected under pressure. On the other hand, the free packer 59 is attached so as to surround the tension material 61 on the tip side of the attachment position of the mouth packer 57. A grout material injection pipe 6 which is a cloth packer and penetrates the mouth packer 57 through a cutable injection hose 65.
Connected to 7.

Then, as shown in FIG. 12, when the compressed air injecting hose 69 is connected to the mouth packer 57 to inject the compressed air A, the mouth packer 57 expands and closes the casing pipe 35. Then, in this state, as shown in FIG. 13, when the grout material G is injected into the casing pipe 35 from the swivel 71 mounted on the rear end of the casing pipe 35, as shown in FIG. 57 contracts to cause an inner wall 35a of the casing pipe 35.
Since the grout material G passes through the gap 73 formed between and, the anchor body is gradually formed in the anchor fixing portion in the ground 3.

Then, in this injection state, if the entire connected casing pipe is gradually pulled out, the mouth packer 57 is shrunk by the injection pressure of the grout material G, so that the pulling out is easy.

Thus, the casing pipe 35 on the rearmost end side
When all are pulled out from the anchor hole 63, the mouth packer 57 is located in the casing pipe 35 'connected next as shown in FIG. Therefore, when the casing pipe 35 on the rearmost end side is collected in such a state, the rear end opening of the next casing pipe 35 'becomes atmospheric pressure and the pressure drops sharply. The inner wall 35a 'of the casing pipe 35' expands instantaneously.
Press against.

Then, the swivel 71 is attached to the rear end opening of the casing pipe 35 ', the grout material G is pressure-injected into the anchor hole 63 again, and then the grout material G is extracted and recovered. By sequentially repeating the same operation for the casing pipes connected accordingly, the anchor body is gradually formed in the anchor fixing portion.

In this way, when the anchor body is constructed and the last casing pipe pulled up is recovered from the anchor hole 63, the free packer 59 projects from the tip of the casing pipe 35 "as shown in FIG.
Grout material supply hose 75 to grout material injection pipe 67
And the grout material is injected into the free packer 59, the free packer 59 expands and closes the anchor hole 63.

Then, as shown in FIG. 17, the compressed air A is discharged from the mouth packer 57 which has expanded and closed the last casing pipe 35 ", and the casing pipe 35" is fixed to the anchor hole 63 as shown in FIG. Even if you pull it from
The free packer 59 closes the anchor hole 63 to prevent the grout material G from being jetted by the pressurized water. And in FIG.
As described above, the injection hose 65 is cut, the cut portion is tightened, and the mouth packer 57 is removed from the tension member 67, whereby the anchor body construction work is completed.

In the present embodiment, the mouth packer 57 and the free packer 59 thus constructed are used to open and close the inside of the casing pipe 35 by the mouth packer 57 by pressurizing the grout material G into the anchor holes 63. Repeatingly, the anchor pipe is formed in the ground 3, and the casing pipe 35 is sequentially pulled out and collected, and the last casing pipe 35 ″ pulled up is anchor hole 63 (casing pipe insertion hole 5) as shown in FIG. In recovering from the casing pipe 35 ″, when the free packer 59 projects from the tip of the casing pipe 35 ″, the grout material is injected into the free packer 59 and expanded to expand the casing pipe insertion hole 5 as shown in FIGS. To block.

Next, as shown in FIG. 21, a water blocking material having a specific gravity which is equal to or slightly larger than that of the grout material G is injected from the injection port 31 of the pedestal portion 13, and at the same time, the mouth packer 57 is contracted to cause the casing pipe 35. ″ Inject the grout material G from the swivel 71 at the rear end. At this time, be careful not to let the casing pipe 35 ″ come out of the water stop portion 17, and discharge the grout material G from the tip of the casing pipe 35 ″. After the casing pipe 35 ″ is vertically thrusted to complete the injection of the water blocking material, the casing pipe 35 ″ and the mouth packer 57 are pulled out and collected to remove the water blocking portion 17 from the pedestal portion 13, and the grout material G
After curing, the tension head 61 is tensioned by using the anchor head 77 and the jack as shown in FIG.
By anchoring at 3, the anchor construction will be completed.

Thus, according to the method of this embodiment, the free packer 59 is projected from the tip of the last casing pipe 35 "as described above.
To seal the anchor hole 63, and at the same time as injecting a waterproofing material having a specific gravity which is equal to or slightly higher than that of the grout material G from the injection port 31 of the pedestal portion 13, at the same time, the swivel 71 at the rear end of the casing pipe 35 ″. Injecting grout material G from the casing pipe 35 ″ and discharging the grout material G from the tip of the casing pipe 35 ″ causes a vertical thrust movement of the casing pipe 35 ″. The solid material of the water blocking material does not float up inside the casing pipe 35 ″ and adhere to the inner periphery thereof to be solidified.

Therefore, there is an advantage that the last casing pipe 35 "and the mouth packer 57 can be pulled out and collected more easily than ever before. This effect has a smaller specific gravity than the conventional grout material. Even when the water is injected from the injection port 31, the gel-like solid material of the water blocking material in which the water blocking material and the grout material G have reacted does not float up inside the casing pipe 35 ″ and adhere to its inner periphery to be solidified. It has become clear in the field implementation that the same effect can be obtained.

Further, according to the pedestal and water blocking box 9 used in this embodiment, when the water blocking portion 17 is connected to the pedestal portion 13, the push cap 4 screwed onto the water blocking portion inner pipe 37 by the worker.
If 3 is tightened, casing pipe 35 will be
As the holes are drilled, the rubber gaskets 39 and 41 for water stop inside the water stop inner pipe 37 transmit the rotation of the casing pipe 35 to the push cap 43 by friction with the casing pipe 35,
Since the push cap 43 is automatically tightened and the water blocking rubber packings 39 and 41 are pressed against the outer circumference of the casing pipe 35, the casing pipe is used for drilling the ground 3 while injecting the drilling water W. Good water tightness between the water blocking portion 35 and the water blocking portion 17 can be obtained.

Although the insertion pipe 7 is directly inserted into the casing pipe insertion hole 5 of the earth retaining wall 1 in the above embodiment, when the sleeve pipe is previously attached to the earth retaining wall 1 at the anchoring position. The insertion pipe 7 may be inserted into the sleeve pipe and the pedestal 17 may be attached to the wall surface 1 a of the earth retaining wall 1.

[0049]

As described above, according to the anchor construction method according to the first aspect, when the water blocking portion of the pedestal / water blocking box is connected to the pedestal portion, the worker is attached to the inner pipe of the water blocking portion. By tightening the push cap, as the casing pipe drills the ground, friction with the casing pipe causes the rubber gasket for water stop to transmit the rotation of the casing pipe to the push cap, and as a result, the push cap automatically moves. Since the rubber gasket for water stop is pressed against the outer periphery of the casing pipe when it is fastened to the hole, it is possible to obtain good watertightness between the casing pipe and the water stop when drilling the ground by injecting water for hole drilling. be able to.

When the last casing pipe is pulled out and recovered, the gel-like solid material of the water-stopping material in which the water-stopping material and the grout material have reacted does not float up in the casing pipe to adhere and solidify. It is easier to pull out and collect the casing pipe than before.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a pedestal and water blocking box attached to a wall of a retaining wall.

FIG. 2 is an exploded view of the pedestal and water blocking box shown in FIG.

FIG. 3 is a front view of the pedestal and water blocking box shown in FIG.

FIG. 4 is a side view of the pedestal and water blocking box shown in FIG. 1.

FIG. 5 is a cross-sectional view of a casing pipe tip to which a water blocking portion is temporarily fixed.

FIG. 6 is a process drawing of an example of the anchor construction method according to claim 1 showing a method of attaching the pedestal portion to the retaining wall.

FIG. 7 is a process drawing of an anchor construction method showing a method of connecting a water blocking part to a pedestal part.

FIG. 8 is a process drawing of the anchor construction method showing a state in which the water blocking part is connected to the pedestal part.

FIG. 9 is a process drawing of an anchor construction method showing a state of drilling the ground with a casing pipe.

FIG. 10 is a process drawing of the anchor construction method showing the inserted state of the tension member with the mouth packer and the free packer attached.

FIG. 11 is an explanatory diagram showing configurations of a mouth packer and a free packer according to the applicant's prior application.

FIG. 12 is an explanatory diagram showing a state where the mouth packer is inflated.

FIG. 13 is a process drawing of an anchor construction method showing a state of injecting grout material into a casing pipe.

FIG. 14 is an explanatory diagram showing a state in which the mouth packer is shrunk by the pressure injection of grout material.

FIG. 15 is an explanatory diagram showing a state of the mouth packer when the casing pipe on the rearmost end side is collected.

FIG. 16 is an explanatory diagram showing a state where the mouth packer and the free packer are inflated.

FIG. 17 is an explanatory diagram showing a state in which compressed air in the mouth packer is exhausted.

FIG. 18 is an explanatory diagram showing a state in which the last casing pipe is pulled out and collected.

FIG. 19 is an explanatory diagram showing a state in which the anchor body forming work has been completed.

FIG. 20 is a process drawing of the anchor construction method showing a state where the free packer is inflated.

FIG. 21 is a process drawing of an anchor construction method showing a state of injecting grout material and water blocking material.

FIG. 22 is an explanatory diagram showing a completed state of the anchor construction method.

[Explanation of symbols]

 1 earth retaining wall 1a wall surface 3 ground 5, 33, 51 casing pipe insertion hole 7 insertion pipe 9 pedestal / water-stop box 11 urethane sponge 13 pedestal 15 rubber packing 17 water stop 19 joining plate 21 pedestal body 29 discharge port 31 Note Inlet 35 Casing pipe 37 Water stop inner pipe 39, 41 Water stop rubber packing 43 Push cap 45 Flange member 47 Left screw 53 Drilling bit 57 Mouth packer 59 Free packer 61 Tensile material 63 Anchor hole 65 Grout material Injection hose

Claims (1)

[Claims] 1. A joining plate which is bolted to a wall surface such as a retaining wall or a retaining wall via a sealing member, and is inserted at an anchor construction angle through the joining plate and attached to the tip of a casing pipe. An insertion pipe that has an inner diameter larger than that of the drilling bit and that can be inserted into a casing pipe insertion hole that is provided in advance at an anchor construction position such as a retaining wall or a retaining wall, and the end of the insertion pipe that is attached to the joining plate. The casing pipe insertion hole having a diameter larger than that of the drill bit is formed coaxially with the insertion pipe, and the side wall is provided with a hole for draining water and earth and sand and an inlet for injecting the waterproofing material. Insert the above-mentioned insertion pipe into the casing pipe insertion hole provided in the earth retaining wall, etc., and bolt the pedestal part of the water-stopping box that also serves as a pedestal consisting of a box-shaped pedestal body At the same time, the pedestal body can be bolted through the flange part, the left screw is engraved on the outer circumference, and the inside of the cylindrical water stop part is formed with a taper part that is gradually reduced in diameter in the insertion direction of the casing pipe. The pipe and the inner tube of the water shut-off part are installed in two layers and have a cylindrical soft water-stop rubber packing having an inner diameter smaller than that of the drill bit and an inner diameter smaller than that of the drill bit, and the inner pipe of the water stop part on the outer periphery. The cylindrical rubber gasket for hard water stoppage that has a taper part that matches the taper part that is formed on the front end, and the inner end of the pipe inside the water stoppage that is screwed into the casing pipe insertion hole that is smaller in diameter than the drill bit. The water blocking part of the pedestal water blocking box consisting of the push cap is temporarily fixed to the outer circumference of the casing pipe above the drill bit, and the inner pipe of the water blocking part of the water blocking part is inserted as the casing pipe is inserted into the pedestal. The pedestal body of the pedestal part is After the bolts are tightened through the reel member, the drilling slime that rises along the outer circumference of the casing pipe is discharged by adjusting the amount of water with the valve installed at the discharge port, and the casing pipe is adjusted according to the drilling depth. Are sequentially connected to drill the ground, and when drilling to the desired depth is completed, the casing pipe is formed to open and close by the injection pressure of the grout material injected under pressure. With a mouth packer,
A cloth bag shape that is located closer to the tip than the mounting position of the mouth packer and expands with the grout material injected from the grout material injection hose connected to the grout material injection pipe that penetrates the mouth packer and closes the anchor hole Insert the tension material with the free packer attached to the rear end side, then pressurize and inject the grout material into the anchor hole to repeatedly open and close the casing pipe by the mouth packer, and place the anchor body in the ground. The casing pipes that were created were sequentially pulled out and collected, and when the free packer protruded into the anchor hole from the tip of the last casing pipe, grout material was injected into the free packer and expanded to close the anchor hole. Shrink the mouth packer and inject the waterproof material from the above-mentioned inlet for waterproof material injection, while After pouring the grout material from the end and thrusting the casing pipe in the vertical direction, after the completion of the injection of the waterproof material, the casing pipe and the packer at the mouth are pulled out and collected, and after removing the waterproof part from the pedestal part and curing the grout material, Anchor construction method characterized by tensioning the end of the tension material and fixing it to the pedestal.