JP2009068285A - Earth anchor construction method and water stop device to be used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earth anchor construction method for shortening a time required for water stop, and to provide a water stop device to be used for the same. <P>SOLUTION: In the earth anchor construction method, the water stop device is installed at a predetermined position on a pressure-proof plate which is constructed on a ground where confined groundwater exists. A casing is used for drilling the ground while passing through the pressure-proof plate, grout is filled in the casing and a tensile material is inserted therein, the casing is pulled off while filling the grout with pressure, and the tensile material is tensed and fixed. A flow path in the water stop device is closed with a shutter valve during water stop, and the tensile material inserted through the water stop device is constrained by a wire valve during pulling off the tensile material. The water stop device comprises a lower water stop device to be installed at a predetermined position on the pressure-proof plate, the shutter valve provided on the lower water stop device for closing the flow path in the water stop device during water stop, the wire valve provided on the shutter valve for constraining the tensile material inserted through the water stop device during pulling off the tensile material, and a pre-bender assembly provided on the wire valve. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an earth anchor method that is formed in ground where pressurized groundwater exists, and a water stop device that is used in the earth anchor method.

  Conventionally, as an earth anchor method to be formed in the ground where pressurized groundwater exists and a water stop device used for the ground anchor method, for example, at a predetermined position of a pressure plate constructed on the ground where pressurized groundwater exists Install a water stop, drill the ground through the pressure plate in the casing, fill the casing with grout, insert the tensile material, pull out the casing while injecting the grout under pressure, and tension the tensile material An earth anchor method for fixing and a water stop device used for the earth anchor method (for example, see Patent Documents 1, 2, 3, 4, and 5) are known.

31 and 32 show the water stop device 2 installed at a predetermined position of the pressure plate 1. The water stop device 2 includes a lower water stop box 3 mounted on the pressure plate 1, an upper water stop box 4 placed on the lower water stop box 3 and having a mouth packer 5 installed therein, It consists of a pre-bender 6 placed on the water stop box 4.
Then, when exchanging the drill bit is necessary, for example, as shown in FIG. 31, first, the casing 7 is pulled up to the lower end of the pre-bender 6. Next, a two-component cement-based instantaneous setting material 8 is injected into the lower water stop box 3. And the casing 7 is collect | recovered and the water stop apparatus 2 is disassembled. Thereafter, the two-component cement-based instantaneous setting material 8 that has been crushed and solidified in the lower water stop box 3 is removed. Next, the water stop device 2 was assembled, the bit of the casing 7 was replaced, and the work of re-drilling was performed.
In addition, after anchor placement, when the pressure-proof plate installation packer is in a state where water cannot be stopped due to breakage, rupture or the like, first, the casing 7 is pulled up to the lower end of the pre-bender 6, as shown in FIG. Next, a cement-based injecting material 9 is injected into the mouth packer 5 previously installed in the upper water stop box 4. After that, the work of removing the casing 7 was performed.
JP 2007-23646 A JP 2006-161345 A Japanese Patent Laid-Open No. 10-280855 Japanese Patent Laid-Open No. 10-266758 Japanese Patent Laid-Open No. 8-269951 Japanese Patent Laid-Open No. 4-198522 Japanese Utility Model Publication No. 6-4139

However, in the conventional earth anchor method and the water stop device used for this earth anchor method, when the drill bit needs to be replaced at the time of drilling or due to obstacle removal, etc., a two-component cement-based instantaneous setting material under pressure Therefore, it was necessary to secure a sufficient injection work time from the point that the two-component cement-based instantaneous setting material 8 was diluted and the injection amount was unclear.
In addition, after the injection of the two-component cement-based instantaneous setting material 8, there is a work for assembling, disassembling, and solidifying the solidified two-component cement-based instantaneous setting material 8, which requires a lot of time. There was a bug.
In addition, after the injection of the two-component cement-based instantaneous setting material 8 was completed, the plant had to be cleaned.
Therefore, it is disadvantageous when the working time is limited.
In addition, after anchor placement, the packer 5 is made of cloth and dehydrates the cement milk with the pressure of pouring to accelerate hardening when the pressure-proof plate installed packer is in a state where water stoppage is impossible due to breakage or rupture. In order to stop water, there was a problem that it took time to harden the cement-based injection material.
In addition, after the injection of cement-based injection material was completed, the plant had to be cleaned.
Therefore, it is disadvantageous when the working time is limited.

  Patent Document 2 discloses that a packer made of a flexible material is inflated with a pressure fluid such as high-pressure air or high-pressure water in place of the mouth packer 5 in order to ensure water stop when the tension member is pulled out. Thus, there is disclosed a water stop mechanism for closely contacting the outer periphery of the tensile material. However, in the water stop mechanism disclosed in Patent Document 2, in order to expand a packer made of a flexible material, a highly airtight structure is required, and a device for supplying pressure fluid is special. There was a problem such as needing to prepare. Moreover, in the water stop mechanism disclosed in Patent Document 2, when the target is a drilled casing having a diameter of about φ135 mm and is operated to have a small diameter, the rubber itself is wrinkled and a gap is formed. End up. Further, in order to expand a packer made of a flexible material with a pressure fluid such as high-pressure air or high-pressure water, it is necessary to always connect a compressor and maintain the pressure. Furthermore, when a packer made of a flexible material is inflated with a pressure fluid such as high-pressure air or high-pressure water and brought into close contact with the casing, when a slime such as gravel is interposed between the waterstop rubber and the casing, 1 The entire slime of the packer floats due to the slime at the location, and the water is not completely stopped.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an earth anchor method capable of shortening the time required for water stop and a water stop used for the earth anchor method. To provide an apparatus.

The invention according to claim 1 is provided with a water stop device at a predetermined position of a pressure plate constructed on the ground where the groundwater under pressure exists, drilling the ground through the pressure plate with a casing, In the earth anchor method of filling the grout in the casing and inserting a tensile material, pulling out the casing while injecting the grout under pressure, and fixing the tensile material in tension, when the casing penetrates the pressure plate After the rebar cutting in the pressure plate, the casing is pulled up to the pre-bender part of the water stop device, the shutter valve provided on the water stop device is operated to close the water stop device, and the cut rebar is collected The casing is attached to the water stop device, the shutter valve is opened, the hole is re-cut by the casing, and the grout is pressurized and injected. When pulling out the pacing, pulling the casing to pre vendor part of the waterproofing system, characterized in that the water shut-off the periphery of the tension member under tension the wire of the wire valve provided in said waterproofing device.
In the invention according to claim 2, a water stop device is installed at a predetermined position of a pressure plate constructed on the ground where the groundwater under pressure exists, and the ground is drilled through the pressure plate with a casing. In the earth anchor method of filling the grout in the casing and inserting a tensile material, pulling out the casing while injecting the grout under pressure, and fixing the tensile material in tension, when the casing penetrates the pressure plate The casing is pulled up to the pre-bender part of the water stop device, the shutter valve provided on the water stop device is operated to close the water stop device, the bit of the casing is replaced, and the casing is attached to the water stop device. When opening the shutter valve, drilling again with the casing, and pulling out the casing while injecting the grout under pressure Pulling the casing to pre vendor part of the waterproofing system, characterized in that the water shut-off the periphery of the tension member under tension the wire of the wire valve provided in said waterproofing device.

The invention according to claim 3 is provided with a water stop device at a predetermined position of a pressure plate constructed on the ground where the groundwater under pressure exists, drilling the ground through the pressure plate with a casing, In the earth anchor method of filling the grout in the casing and inserting a tensile material, pulling out the casing while injecting the grout under pressure, and fixing the tensile material in tension, when the casing penetrates the pressure plate After the rebar cutting in the pressure plate, the casing is pulled up to the pre-bender part of the water stop device, the shutter valve provided on the water stop device is operated to close the water stop device, and the cut rebar is collected The casing is attached to the water stop device, the shutter valve is opened, and the casing is re-cut by the casing.
The invention which concerns on Claim 4 installs a water stop apparatus in the predetermined position of the pressure plate constructed | assembled on the ground where a pressurized groundwater exists, drills the said ground through the said pressure plate with a casing, In the earth anchor method of filling the grout in the casing and inserting a tensile material, pulling out the casing while injecting the grout under pressure, and fixing the tensile material in tension, when the casing penetrates the pressure plate The casing is pulled up to the pre-bender part of the water stop device, the shutter valve provided on the water stop device is operated to close the water stop device, the bit of the casing is replaced, and the casing is attached to the water stop device. The shutter valve is opened, and the hole is re-cut by the casing.
According to a fifth aspect of the present invention, in the earth anchor method according to the third aspect, the bit of the casing pulled up to a pre-bender portion of the water stop device is replaced.

The invention which concerns on Claim 6 installs a water stop apparatus in the predetermined position of the pressure plate constructed | assembled on the ground in which the pressure groundwater exists, drills the said ground through the said pressure plate with a casing, In the earth anchor method in which a grout is filled in the casing, a tensile material is inserted, the casing is pulled out while the grout is injected under pressure, and the tensile material is tension-fixed, when the hole is drilled in the casing, the casing The wire valve provided in the pre-bender part of the water stop device is tensioned to stop water around the casing.
The invention which concerns on Claim 7 is a water stop apparatus used for the earth anchor method of Claim 1 or Claim 2, and is installed in the predetermined position of the pressure | voltage resistant board constructed | assembled on the ground where a pressurized groundwater exists A water stop device, a shutter valve provided on the lower water stop device and closing the flow path of the water stop device when the water stops, and a shutter valve provided on the shutter valve inside the water stop device when the casing is pulled out. And a wire valve for restraining the casing or the pre-bender assembly provided on the wire valve.
The invention according to claim 8 is the water stopping device used in the earth anchor method according to any one of claims 3 to 6, wherein it is installed at a predetermined position of the pressure plate constructed on the ground where the pressurized groundwater exists. A lower water stop device, a shutter valve provided on the lower water stop device and closing a flow path of the water stop device when water stops, and a pre-bender assembly provided on the shutter valve. It is characterized by.

The invention according to claim 9 is the water stop device according to claim 7 or claim 8, wherein the shutter valve is provided on the lower water stop device by providing a hole smaller than an inner diameter of the lower water stop device. A flange portion, a hole portion having the same diameter as the hole portion of the flange portion, a valve case provided on the flange portion, and a water stop plate is slid from the side portion of the valve case toward the hole portion. And a valve main body that closes the hole.
The invention according to claim 10 is the water stop device according to claim 7, wherein the wire valve has a water stop box provided with a wire insertion hole on a side portion thereof, and a lower rubber tube provided at a lower end portion of the water stop box. A water-stopping rubber tube provided at both ends so as to cover a support portion, an upper rubber tube support portion provided at an upper end portion of the water-stopping box, and the lower rubber tube support portion and the upper rubber tube support portion; A wire insertion hole on a side, a pressing jig for restraining the water stop rubber tube by pressing both ends of the water stop rubber tube against the lower rubber tube support portion and the upper rubber tube support portion; It is inserted from the wire insertion hole of the water stop box and is arranged outside the water stop rubber tube via the wire insertion hole of the holding jig, and the casing is pulled out. And having a wire for restraining the tension member or the casing is inserted into said water stop device.
The invention according to claim 11 is the water stop device according to claim 10, wherein the number of the wires is one, the wire is inserted from the wire insertion hole of the water stop box, and passes through the wire insertion hole of the holding jig. In addition, it is arranged on the entire outer side of the water-stopping rubber tube, and restrains the tension member or the casing inserted into the water-stopping device when the casing is pulled out.
The invention according to claim 12 is the water stop device according to claim 10, wherein the number of the wires is two, which are respectively inserted from the wire insertion holes of the water stop box, and pass through the wire insertion holes of the holding jig. Then, it is arranged at a position facing the outside of the water-stopping rubber tube and restrains the tensile material inserted into the water-stopping device or the casing when the casing is pulled out.

In the present invention, since the water stop method is changed from the injection method to the mechanical method, the time required for water stop is clarified, and it is possible to cope with the case where the working time is limited.
Since the present invention does not require the work of assembling, disassembling, and solidifying the solidified two-component cement-based instantaneous setting material, the time is shortened.
Since the present invention does not require a plant cleaning operation after the injection of the two-component cement-based instantaneous setting material or the cement-based injection material, the operation time can be shortened.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
(First embodiment)
1 to 19 show a water stop device 10 according to a first embodiment of the present invention.
The water stop device 10 according to the present embodiment is placed on the lower water stop device 20 installed at a predetermined position of a pressure plate constructed on the ground where the pressurized groundwater exists, and the lower water stop device 20. A shutter valve 30 that closes the flow path of the water stop device 10 when the water stops, and a wire valve 40 that is placed on the shutter valve 30 and restrains a tensile material that is inserted into the water stop device 10 when the casing is pulled out. And a pre-bender assembly 60 mounted on the wire valve 40.

As shown in FIGS. 1 and 2, the lower water stop device 20 includes a lower water stop box 21 and a base plate 27 attached to the lower part of the lower water stop box 21.
The lower water stop box 21 includes a cylindrical body 22 provided with a water stop material inlet 23 and a drilled slime outlet 24 on the side, and flanges 25 and 26 provided at the upper and lower ends of the cylindrical body 22. I have.
The flanges 25 and 26 are provided with a hole 26a for connecting to the hole 27a of the base plate 27 by an anchor bolt, and a hole 25a for connecting to the hole 31a of the flange 31 of the shutter valve 30 and a bolt nut (not shown). I have.
The base plate 27 is provided with a through hole 28 having a diameter smaller than the inner diameter of the cylindrical body 22 and a hole 27a for inserting an anchor bolt when the water stop device 10 is fixed to the pressure plate. Further, the base plate 27 includes an O-ring groove 27b for mounting an O-ring 27c that is mounted when the flange 26 is placed.

As shown in FIGS. 1 to 5 and FIG. 17, the shutter valve 30 includes a through hole 32 smaller than the inner diameter of the lower water stop box 21 at the center, and is placed on the flange 25 of the lower water stop device 20. The through hole 34 is provided with a flange 31 and a through hole 34 having the same diameter as the through hole 32 of the flange 31, and the valve case 33 placed on the flange 31 and the opening 35 provided on the side of the valve case 33. The valve body 36 is configured to slide the water stop plate 37 toward the closing hole 34 to close the through hole 34.
The flange 31 is mounted with a hole 31a for connecting the hole 25a of the flange 25 of the lower water stop box 21 with a bolt and nut (not shown), and an O-ring 31c that is mounted when the valve case 33 is placed. And an O-ring groove 31b.
In the valve case 33, a groove 38 is provided on the wall surface on the side where the water stop plate 37 is received in the through hole 34, and a silicon material 39 is filled therein. Further, the valve case 33 has a mounting portion 33a provided with a hole 33b for connecting to a hole 31d provided in the flange 31 with a bolt nut (not shown), and a bolt 45 provided in the hole 45a provided in the flange 45 of the wire valve 40. A mounting portion 33c provided with a hole 33d for connection by a nut (not shown) is provided on the outer periphery.
The water stop plate 37 has a tip formed in a circular shape having the same curvature as the through hole 34 so that a gap is not formed between the water stop plate 37 and the through hole 34 when contacting the groove 38 of the through hole 34.

  As shown in FIGS. 1, 2, 6 to 16, 18, and 19, the wire valve 40 includes a water stop box 41 provided with a wire insertion hole 43 on a side portion, and a lower end portion of the water stop box 41. The upper and lower ends cover the lower rubber tube support 47 installed in the upper part, the upper rubber tube support 50 provided at the upper end of the water stop box 41, the lower rubber tube support 47 and the upper rubber tube support 50. A vertically-long cylindrical water-stop rubber tube 53 and a lower rubber tube support portion that restrains the water-stop rubber tube 53 and the upper and lower ends of the water-stop rubber tube 53 by providing a wire insertion hole 56 on the side. 47 and the upper rubber tube support portion 50 are inserted from the outer periphery of the water-stopping rubber tube 53 and the wire insertion hole 43 of the water-stopping box 41. It is arranged on the outside of the water stop rubber tube 53 via the ear insertion hole 56, and is composed of a tensile material 87 inserted into the water stop device 10 when the casing 85 is pulled out or a wire 59 that restrains the casing 85. .

As shown in FIGS. 2 and 6 to 9, the water stop box 41 is provided at the upper end portion of the cylindrical body 42 provided with two wire insertion holes 43 provided to face each other in the diametrical direction. A flange 44 provided with a hole 65a in the flange 65 provided at the lower end of the lower pre-bender part 61 of the pre-bender assembly 60, a hole 44a for connection with a bolt and nut (not shown), and a lower end of the cylinder 42 And a flange 45 that also serves as a reaction force jig placed on the valve case 33 of the shutter valve 30. The flange 45 includes a through hole 46 having the same diameter as the through hole 34 of the shutter valve 30, a hole 49 a provided in the flange 49 of the lower rubber tube support portion 47, and a hole 45 a for connecting with a bolt and nut (not shown). In order to mount a hole 45 a for connecting with a hole 33 d provided in the mounting portion 33 c of the shutter valve 30 with a bolt and nut (not shown), and an O-ring 45 d to be mounted when mounting on the valve case 33. The O-ring groove 45c and the O-ring groove 45e for mounting the O-ring 45f to be mounted when placing the flange of the lower rubber tube support portion 47 are provided.
2, 6, 9, and 10, the holding jig 54 has a pair of semicircular arcs in which a wire insertion hole 56 is provided in the center of the wall surface and a holed flange 57 is provided in the upper and lower ends. The cylindrical body 55 is configured such that the flanges 57 are joined to each other and are joined by bolts and nuts (not shown) through the holes 58 of the flange 57.

As shown in FIGS. 2, 9, 11, and 12, the lower rubber tube support portion 47 has a plurality of concave portions and convex portions connected to the outer periphery, and locks the lower end portion of the rubber tube 53 from the inside. The cylinder part 48 provided with the latching | locking part 48a, and the flange 49 which provided in the lower end part of the cylinder part 48 and provided the hole 49a for connecting with the hole 45a of a flange 45 and a volt | bolt nut (not shown) are provided. ing.
As shown in FIGS. 2, 9, 13, and 14, the upper rubber tube support portion 50 has a plurality of concave portions and convex portions connected to the outer periphery, and locks the upper end portion of the rubber tube 53 from the inside. The cylinder part 51 provided with the latching | locking part 41a and the flange 52 provided in the upper end part of the cylinder part 51 are provided. The upper rubber tube support 50 is pushed in by the flange of the lower bender of the bender assembly 60 described later.
Here, the cylinder part 48 of the lower rubber tube support part 47 and the cylinder part 61 of the upper rubber tube support part 50 have the same diameter and the same height.
The water blocking rubber tube 53 has an inner and outer two-layer structure in which the inner rubber tube 53a is covered with the outer rubber tube 53b.

For example, as shown in FIG. 15, two wires 59 are used, and for example, one wire 59 is used as shown in FIG. When two wires 59 are used, for example, as shown in FIGS. 2, 9, and 15, each of the outer peripheral halves of the water-stopping rubber tube 53 is covered from the wire insertion hole 56 facing the pressing jig 54. The waterproof rubber tube 53 can be compressed in the center direction as shown in FIG. When one wire 59 is used, for example, as shown in FIG. 20, the wire 59 is inserted through one wire insertion hole 56 of the holding jig 54 and rotated around the outer periphery of the water-stopping rubber tube 53. By pulling out from the insertion hole 56 and pulling from both ends or one end, the waterproof rubber tube 53 can be compressed in the center direction as shown in FIG.
In the present embodiment, the wire valve 40 can correspond to an arbitrary diameter, and can correspond to a diameter smaller than 90 mm. In principle, it can correspond to φ0 mm. For example, a holed casing (φ135 mm) to a tendon water stop (φ90 mm). Moreover, since the wire tension does not decrease, there is no need for maintenance. Since it is tightened on the wire with a wire, the water stop rubber can be tightened with a concentrated force, and even if a slime is interposed between the casing or tendon and the water stop rubber, the slime can be pushed to obtain a water stop effect. it can.

The pre-bender assembly 60 includes a lower pre-bender 61 that is placed on the wire valve 40, an intermediate pre-bender 68 that is assembled to the lower pre-bender 61, and an upper pre-bender 75 that is assembled to the intermediate lower pre-bender 68. Has been.
The lower pre-bender 61 includes a cylindrical body 62 and a flange 65 provided at the lower end of the cylindrical body 62. The cylindrical body 62 includes a step portion 63 provided on the inner wall on the flange 65 side for mounting the cylindrical grease cotton 66 and the grease cotton holding ring 67, and a step portion 63 for screwing the intermediate prebender 68. And a female screw part 64 provided from the upper part toward the opening end. The flange 65 includes a hole 65a for connecting to the hole 44a of the flange 44 of the wire valve 40 with a bolt and nut (not shown), and an O-ring 65c to be mounted when mounting on the flange 44 of the wire valve 40. An O-ring groove 65b for mounting and an O-ring groove 65d for mounting an O-ring 65e to be mounted on the flange 52 of the upper rubber tube support 50 are provided.
The intermediate pre-bender 68 is provided with a male screw 70 on the outer periphery, and a connecting portion 69 to be screwed into the female screw portion 64 of the lower pre-bender 61, a water stop rubber 72 and a water stop rubber pressing ring 73. The step part 71 and the female screw part 74 provided from the step part 71 toward the opening end are provided.
The upper pre-bender 75 is provided with a male screw 77 on the outer periphery, a cylinder provided with a connecting portion 76 that is screwed into the female screw portion 74 of the intermediate pre-bender 68, and a flange 78 that is provided at the upper end of the connecting portion 76. It is composed of a body.

In the present embodiment, the shutter valve 30 is used when exchanging the drilling bit is necessary due to obstacle removal or the like during drilling.
For example, as shown in FIG. 17, when removing obstacles (reinforcing bars in pressure-resistant concrete, etc.) and creating anchors under high pressure, the bits used to cut the reinforcing bars (steel cutting ring bits) and obstacles (Reinforcing bars, etc.) must be recovered once, replaced with a special bit with a check valve, and drilled again. In this case, before the bit for cutting the steel material is pulled out from the lower water stop box 21, the inside of the lower water stop box 21 is closed so that groundwater does not spout.
Conventionally, the method of hardening the inside of the lower water stop box by LW (water glass + cement suspension) injection, etc., was generally used, but the injection work time from the point that the dilution of the injection material and the injection amount are unclear Could not be calculated. In addition, it took a very long time because there was curing of the water-stopping material after LW injection, assembly of the water-stopping device, dismantling, and chipping of the solidified water-stopping material.
In the case of the shutter valve 30 used in the present embodiment, for example, as shown in FIG. 17, the shutter valve 30 is closed when the casing 85 is pulled up to the upper part of the water stop plate 37, and after replacing the bit, the shutter valve 30 is It can be opened and re-drilled, greatly reducing time.

Further, in the present embodiment, the wire valve 40 is used when the water stop by the packer in the pressure resistant concrete is incomplete after anchor placement, or when the prebender assembly 60 is replaced or removed during drilling. Is done.
For example, as shown in FIG. 18, before pulling out the casing 85 from the lower water stop box 21, a mouth packer (for example, see the mouth packer described in JP-A-6-10348) is installed in the pressure resistant concrete. At this time, the water stoppage may be incomplete due to damage or rupture of the packer. In this case, the casing 85 is pulled up and tightened with the wire 59 to stop water around the tension member (anchor) 87 and to complete the placement.
Conventionally, LW was injected into the mouth packer in the water stop box, and the water stop box below the mouth packer was generally solidified by LW injection, etc. Had to clean.
In the case of the wire valve 40 used in the present embodiment, for example, as shown in FIG. 18, when the casing 85 is pulled up to the position of the water-stopping rubber tube 53, the water-stopping rubber tube 53 is tightened with a wire 59 and a tensile material. Since the periphery of the (anchor) 87 can be closed and the placement can be completed, it is possible to reduce the labor required for the chipping and cleaning in the lower water stop box 21. Moreover, the drilling machine, casing pipe, etc. can be removed immediately, and the working efficiency is improved.
Furthermore, as shown in FIG. 19, for example, when water leaks from the pre-bender assembly 60 during drilling, the wire valve 40 is actuated to tighten the wire 59 to stop water around the casing pipe 85. The pre-bender assembly 60 can be replaced or disassembled.

(Second embodiment)
20 and 21 show a water stop device 10A according to a second embodiment of the present invention.
The water stop device 10 </ b> A according to this embodiment is obtained by removing the wire valve 40 of the water stop device 10 according to the first embodiment and attaching a pre-bender assembly 70 on the shutter valve 30. Other configurations are the same as those of the water stop device 10 according to the first embodiment. Therefore, detailed description is omitted.

(Third embodiment)
Next, based on the construction procedure shown in FIG. 22, the earth anchor construction method using the water stop apparatus 10 according to the first embodiment of the present invention shown in FIGS.
First, before installation of the water stop device 20, as shown in FIG. 23, a base plate 27 for mounting the lower water stop device 20 of the water stop device 10 was constructed on, for example, the ground where the pressurized groundwater exists. Attached to a predetermined position of the pressure plate 80. At this time, a hole 80a for installing the anchor bolt 81 is provided in the pressure plate 80, and the anchor bolt 81 is installed in the hole 80a. The anchor bolt 81 is inserted into the hole 27a of the base plate 27 to place the base plate 27, the level of the base plate 27 is adjusted, and the non-shrink mortar 80b is driven to complete the installation of the base plate 27. Next, the lower water stop device 20 of the water stop device 10 is installed on the base plate 27.
Next, the coring machine 82 is installed on the lower water stop device 20. Next, the pressure plate 80 is drilled by the coring machine 82 and the coring operation is performed until the lower bar 83 of the pressure plate 80 is cut. Next, after the coring is completed, the coring machine 82 is removed. If the lower bar 83 has not been removed by coring, a bit for cutting a steel material is set, and the lower bar is cut and collected.

Next, the casing 85 is built in the hole 84 drilled by the coring.
Next, as shown in FIGS. 1 to 19 and 24, the water stop device 10 is assembled by attaching the shutter valve 30, the wire valve 40 and the pre-bender assembly 60 to the lower water stop device 20.
Next, as shown in FIG. 25, a rotary percussion drilling machine 86 is set, and the lower stripe 83 of the pressure plate 80 is cut. When the lower line 83 is cut, the groundwater below the pressure plate 80 spouts out. Therefore, as shown in FIGS. 17 and 26, when the tip of the casing 85 is pulled up to the top of the shutter valve 30, The through hole 34 is closed by pushing until it comes into contact with the groove 38 of the through hole 34.
Next, the casing 85 is all pulled up, the fault is recovered, and the bit is replaced with a special bit 85a with a check valve. Again, the casing 85 is set in the water stop device 10, and the shutter valve 30 is released.

Next, as shown in FIG. 27, a rotary percussion drilling machine 86 drills to a predetermined depth by a special bit 85a with a check valve. As shown in FIG. Remove.
Next, as shown in FIGS. 28 and 29, an injection hose is inserted to the tip of the casing 85 to inject the grout 89. Next, a tendon (tensile material (anchor)) 87 equipped with the mouse packer 88 and the mouth packer 90 is inserted, and the mouse packer 88 is operated after completion. Next, the casing 85 is recovered while the grout 89 is pressurized and injected, and when the tip of the casing 85 passes through the pressure plate 80, the grout 89 is pressurized and stopped in the mouth packer 90. After completion of the packer operation, the water-stopping material inlet 23 and the drilled slime discharge port 24 of the lower water-stop box 21 are opened to confirm that there is no water discharge. Here, when the water stop effect by the mouth packer 90 is incomplete, the tip of the casing 85 is pulled up to the upper part of the wire valve 40 of the water stop device 10 as shown in FIGS. Tighten 59.
Next, after hardening the grout 89, the water stop injection port 23 and the drilled slime discharge port 24 of the lower water stop box 21 are opened to confirm that there is no water discharge, and the water stop device 10 is removed.
Thereafter, the strength of the grout 89 is confirmed. Then, a bearing plate, anchor head, etc. are attached, a fixing jack is installed, a quality assurance test is performed, and fixing is performed. Next, the remaining fixing length is cut, a back surface antirust material is injected, the head cap is fixed, and the antirust material is injected into the head cap.

  In addition, although the case where the wire valve 40 was used was demonstrated in this embodiment, when the water stop by the packer 88 is enough, it can construct without using the wire valve 40. Therefore, when such construction can be predicted, the water stop device 10A according to the second embodiment can be used instead of the water stop device 10 according to the first embodiment.

It is a front view which shows the water stop apparatus which concerns on 1st embodiment of this invention. It is sectional drawing which shows the water stop apparatus which concerns on 1st embodiment of this invention. It is a top view which notches and shows a part of shutter valve | bulb of FIG. It is a top view which shows the shutter valve | bulb of FIG. It is a top view which shows the flange of the shutter valve | bulb of FIG. It is a top view which notches and shows a part of wire valve of FIG. It is sectional drawing which shows the water stop box of the wire valve of FIG. It is a top view which shows the water stop box of the wire valve of FIG. It is sectional drawing which shows the wire valve of FIG. It is a top view which shows the holding jig of the wire valve of FIG. It is sectional drawing which shows the lower rubber tube support part of the wire valve of FIG. It is a top view which shows the lower rubber tube support part of the wire valve of FIG. It is sectional drawing which shows the upper rubber tube support part of the wire valve of FIG. It is a top view which shows the upper rubber tube support part of the wire valve of FIG. It is explanatory drawing which shows the clamping | tightening state by two wires in the wire valve of FIG. It is explanatory drawing which shows the clamping | tightening state by one wire in the wire valve | bulb of FIG. It is a figure explaining the effect | action of the shutter valve | bulb of FIG. It is a figure explaining the effect | action of the wire valve of FIG. It is a figure explaining the effect | action of the wire valve of FIG. It is a top view which shows the water stop apparatus which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the water stop apparatus which concerns on 2nd embodiment of this invention. It is a flowchart which shows the construction procedure of the earth anchor construction method which concerns on 3rd embodiment of this invention. It is sectional drawing which shows the coring operation | work in 3rd embodiment of this invention. It is sectional drawing which shows assembly of the water stop apparatus in 3rd embodiment of this invention, and insertion of a casing. It is sectional drawing which shows the drilling by the rotary percussion drilling machine in 3rd embodiment of this invention. It is sectional drawing which shows bit replacement | exchange of the rotary percussion drilling machine in 3rd embodiment of this invention. It is sectional drawing which shows the drilling by the rotary percussion drilling machine in 3rd embodiment of this invention. It is sectional drawing which shows injection | pouring of the hole drilling and grout by the rotary percussion drilling machine in 3rd embodiment of this invention. It is sectional drawing which shows pulling-out of the casing in 3rd embodiment of this invention. It is sectional drawing which shows the clamping | tightening by the wire valve in 3rd embodiment of this invention. It is explanatory drawing which shows the working state in the case of exchanging a drill bit at the time of drilling in a conventional construction method, or obstruction removal. It is explanatory drawing which shows the operation | work state in the state in which water stoppage is impossible after the anchor placement in the conventional construction method because the pressure plate installation packer is broken, ruptured or the like.

Explanation of symbols

10, 10A Water stop device 20 Lower water stop device 21 Lower water stop box 22 Cylindrical body 23 Water stop material injection port 24 Water stop material discharge port 25, 26, 31, 45, 49, 65 Flange 27 Base plate 30 Shutter valve 32 , 34 Through hole 33 Valve case 35 Opening portion 36 Valve body 37 Water stop plate 38 Groove 39 Silicon material 40 Wire valve 41 Water stop box 43, 56 Wire insertion hole 47 Lower rubber tube support portion 50 Upper rubber tube support portion 53 Water stop Rubber tube 54 Holding jig 59 Wire 60 Pre-bender assembly 61 Lower pre-bender portion 68 Intermediate pre-bender 75 Upper pre-bender 80 Upper pressure plate 81 Anchor bolt 82 Coring machine 83 Lower bar 84 Hole 85 Casing 86 Rotary percussion drilling machine 87 Tensile material (Tendon)
88 Mouse packer 89 Grout 90 Mouth packer

Claims (12)

A water stop device is installed at a predetermined position of the pressure plate built on the ground where the groundwater to be pressurized exists, and the ground is drilled through the pressure plate with a casing, and the casing is filled with grout. With an earth anchor method that inserts a tensile material and pulls out the casing while injecting grout under pressure, and fixes the tensile material in tension.
When penetrating the pressure plate in the casing, the casing is pulled up to a pre-bender part of the water stop device after cutting the reinforcing bar in the pressure plate, and the water stop device is operated by operating a shutter valve provided in the water stop device. The device is closed, the cut reinforcing bars are collected, the casing is attached to the water stop device, the shutter valve is opened, and the hole is re-cut by the casing,
When pulling out the casing while injecting the grout under pressure, the casing is pulled up to the pre-bender part of the water stop device, and the wire of the wire valve provided in the water stop device is tensioned to surround the tension material. An earth anchor construction method characterized by stopping water. A water stop device is installed at a predetermined position of the pressure plate built on the ground where the groundwater to be pressurized exists, and the ground is drilled through the pressure plate with a casing, and the casing is filled with grout. With an earth anchor method that inserts a tensile material and pulls out the casing while injecting grout under pressure, and fixes the tensile material in tension.
When penetrating the pressure plate in the casing, the casing is pulled up to a pre-bender part of the water stop device, and the water stop device is closed by operating a shutter valve provided in the water stop device. Replace the bit, attach a casing to the water stop device, open the shutter valve, re-perforate by the casing,
When pulling out the casing while injecting the grout under pressure, the casing is pulled up to the pre-bender part of the water stop device, and the wire of the wire valve provided in the water stop device is tensioned to surround the tension material. An earth anchor construction method characterized by stopping water. A water stop device is installed at a predetermined position of the pressure plate built on the ground where the groundwater to be pressurized exists, and the ground is drilled through the pressure plate with a casing, and the casing is filled with grout. With an earth anchor method that inserts a tensile material and pulls out the casing while injecting grout under pressure, and fixes the tensile material in tension.
When penetrating the pressure plate in the casing, the casing is pulled up to a pre-bender part of the water stop device after cutting the reinforcing bar in the pressure plate, and the water stop device is operated by operating a shutter valve provided in the water stop device. An earth anchor method characterized in that the device is closed, the cut reinforcing bars are collected, the casing is attached to the water stop device, the shutter valve is opened, and the casing is re-machined. A water stop device is installed at a predetermined position of the pressure plate built on the ground where the groundwater to be pressurized exists, and the ground is drilled through the pressure plate with a casing, and the casing is filled with grout. With an earth anchor method that inserts a tensile material and pulls out the casing while injecting grout under pressure, and fixes the tensile material in tension.
When penetrating the pressure plate in the casing, the casing is pulled up to a pre-bender part of the water stop device, and the water stop device is closed by operating a shutter valve provided in the water stop device. An earth anchor method characterized in that the bit is replaced, a casing is attached to the water stop device, the shutter valve is opened, and the casing is re-machined. In the earth anchor method according to claim 3,
The earth anchor method characterized by exchanging the bit of the casing pulled up to the pre-bender part of the water stop device. A water stop device is installed at a predetermined position of the pressure plate built on the ground where the groundwater to be pressurized exists, and the ground is drilled through the pressure plate with a casing, and the casing is filled with grout. With an earth anchor method that inserts a tensile material and pulls out the casing while injecting grout under pressure, and fixes the tensile material in tension.
An earth anchor construction method characterized in that when the hole is drilled in the casing, a tension is applied to a wire valve provided on a pre-bender portion of the water stop device to stop water around the casing. In the water stop apparatus used for the earth anchor construction method according to claim 1 or claim 2,
A lower water stop device installed at a predetermined position of a pressure plate constructed on the ground where the groundwater under pressure exists,
A shutter valve that is provided on the lower water stop device and closes the flow path of the water stop device when water stops;
A wire valve that is provided on the shutter valve and is inserted into the water stop device when the casing is pulled out or a wire valve that restrains the casing;
And a pre-bender assembly provided on the wire valve. In the water stop apparatus used for the earth anchor method according to any one of claims 3 to 6,
A lower water stop device installed at a predetermined position of a pressure plate constructed on the ground where the groundwater under pressure exists,
A shutter valve that is provided on the lower water stop device and closes the flow path of the water stop device when water stops;
And a pre-bender assembly provided on the shutter valve. The water stop device according to claim 7 or claim 8,
The shutter valve is
Providing a hole smaller than the inner diameter of the lower water stop device, a flange portion provided on the lower water stop device,
Providing a hole portion having the same diameter as the hole portion of the flange portion, and a valve case provided on the flange portion;
A water stop device comprising: a valve main body that closes the hole portion by sliding a water stop plate from a side portion of the valve case toward the hole portion. The water stop device according to claim 7,
The wire valve is
A water stop box with a wire insertion hole on the side,
A lower rubber tube support provided at the lower end of the water stop box;
An upper rubber tube support provided at the upper end of the water stop box;
A waterproof rubber tube provided so that both ends thereof cover the lower rubber tube support and the upper rubber tube support;
A holding jig for restraining the water stop rubber tube by providing a wire insertion hole on a side portion and pressing both ends of the water stop rubber tube against the lower rubber tube support portion and the upper rubber tube support portion;
A tension inserted through the wire insertion hole of the water stop box, arranged outside the water stop rubber tube via the wire insertion hole of the holding jig, and inserted into the water stop device when the casing is pulled out. And a wire for restraining the material or the casing. The water stop device according to claim 10,
The wire is one, inserted from the wire insertion hole of the water stop box, and arranged on the entire outer side of the water stop rubber tube via the wire insertion hole of the holding jig, and when the casing is pulled out The water stop device characterized by restraining the tension member or the casing inserted through the water stop device. The water stop device according to claim 10,
The wires are two, respectively inserted from the wire insertion holes of the water stop box, and arranged at opposing positions outside the water stop rubber tube via the wire insertion holes of the holding jig, A water stop device characterized by restraining a tensile material inserted into the water stop device or the casing when the casing is pulled out.

Images