JP2012041692A - Drilling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drilling method capable of preventing the collapse or crash of an excavated borehole after performing drilling using a free boring machine provided with a flexible rod, and capable of making apparatuses required in work thereafter surely reach a scheduled part.SOLUTION: A drilling fluid is jetted from drilling means (16) to drill soil, a closing member (3) is pressurized to shear and destroy fixing means (20), and the closing members (3, 3A) are extruded to an area (underground area 101) on the outer side of the rod (10). The apparatuses (7, 7B, 8) required in the work after drilling are inserted into a hollow part (13) on the inner side of the rod (10) and moved to the distal end of the rod (10).

Description

  The present invention relates to a drilling technique using a freely boring-equipped device including a flexible rod, so-called “curved boring”.

Bent boring using a universal boring machine has a wide range of applications because it can drill holes along any line.
For example, it is possible to prevent liquefaction of a region immediately below the existing building by drilling a hole from a location separated from the existing building to a region immediately below the existing building (see Patent Document 1).
In addition, it is possible to install a device at an arbitrary point, drill a hole in the ground along a predetermined line, and inject a filler into a desired region (see Patent Document 2).
Alternatively, the underground can be drilled along a predetermined line from a remote location to the contaminated soil, and the contaminated soil can be purified using the drilled borehole (see Patent Document 3).
The applicant has already proposed these applications.

When constructing the above-mentioned application example using the conventional bending boring technology, a flexible rod (universal boring rod) is once pulled out from the boring hole drilled by bending boring to the ground side, and then The members necessary for this work were inserted into the borehole.
However, in the case of soft ground such as sand ground, there is a possibility that the drilled boring hole may collapse or collapse by pulling out the free boring rod. If the borehole collapses or collapses, members necessary for the subsequent work cannot reach a predetermined location in the ground.
On the other hand, even when the ground is relatively strong and the drilled boring hole does not collapse or collapse, after the free boring rod is pulled out, earth and sand, mud, etc. flow into the drilled boring hole. There is a possibility that a device necessary for the subsequent work cannot be inserted.
Although the above-described conventional technologies (Patent Documents 1 to 3) are useful technologies, they do not solve such problems.

JP 2004-60243 A Japanese Patent Laid-Open No. 2003-3459 JP 2004-5999 A

  The present invention has been proposed in view of the above-mentioned problems of the prior art, and after drilling using a boring machine equipped with a flexible rod, the drilled borehole is collapsed or collapsed. The purpose is to provide a drilling method capable of preventing and making sure that the equipment necessary for the subsequent work reaches the planned location.

  The drilling method of the present invention is a flexible hollow rod provided with a drilling means (for example, a drilling fluid discharge hole 16) and a drilling direction control means (for example, a reaction plate 2 for correction) at the tip. In a drilling method (so-called “curved boring”) in which a boring hole is drilled using the (general boring rod 10), the hollow portion (13) inside the rod (10) is a drilling fluid (for example, bentonite, water). The closing member (tip core portion 3) that closes the tip of the rod is fixed to the rod (10) by fixing means (for example, a shear pin 20), and the drilling means ( 16), a drilling step in which a drilling fluid is jetted to drill the ground, and the closing member (3) is pressed to shear and break the fixing means (20), thereby closing the closing member (3, 3A) to the rod ( 10) Outside area (underground area 101) The device (for example, the sleeve tube 7 and the chemical solution injection tube 7B) necessary for the step of extruding the tube and the work after the drilling (for example, injection by the sleeve tube 7 or the chemical solution injection tube 7B) is a hollow portion inside the rod (10). (13) It is characterized by having a step of inserting into the rod (10) and moving to the tip of the rod (10).

  In the present invention, in the step of pushing out the closing member (3, 3A), the pressing member (5, 5A) is inserted into the hollow portion (13) inside the rod (10) to close the pressing member (5, 5A). It is preferable that the closing member (3) is pressed via the pressing member, including the step of contacting the member (3, 3A).

In the present invention, the tuyere side end (3r) of the closing member (3) preferably has a plane orthogonal to the central axis of the closing member (3).
Alternatively, in the present invention, the tuyere side end portion (3Ar) of the closing member (3A) has a plane inclined with respect to the central axis of the closing member (3A).
Furthermore, in the present invention, when pressing the closing member (3), it is preferable to add a fluid pressure (F) to the hollow portion (13) inside the rod (10) to increase the fluid pressure (F). .
Alternatively, when pressing the closing member (3), it is preferable to insert the pressing rod (6) into the hollow portion (13) inside the rod (10) and press the pressing rod (6).

In carrying out the present invention, the post-drilling operations include not only the injection by the sleeve tube (7) or the chemical solution injection tube (7B) but also the measuring equipment (8: TV camera, magnetic exploration device, pore water pressure measurement device, etc. ) Measurement operations (for example, confirmation of the ground condition by a TV camera, magnetic exploration by insertion of a magnetic exploration device, measurement of pore water pressure by a pore water pressure measurement device) are also included.
Here, when performing the measurement work, measurement equipment (8: TV camera, magnetic exploration device, pore water pressure measurement device, etc.) necessary for the measurement work is put into the hollow portion (13) inside the rod (10). Step of inserting and moving to the tip of the rod (10), and measuring the measuring device (8) outside the tip of the rod (10) (for example, ground condition confirmation, magnetic exploration, pore water pressure measurement) ), A step of housing the measuring device (8) in the rod (10) after the measurement, and a rod (10) housing the measuring device (8) on the tuyere side for performing the next measurement work It is preferable to have the process of moving to a position.

According to the present invention having the above-described configuration, the closing member (3) is pressed and the fixing means (for example, the shear pin 20) is sheared to break the closing member (3, 3A) outside the rod (10). After pushing out to the area (underground area 101) and pushing the closing member (3, 3A) to the area outside the rod (10) (underground area 101), an opening is formed at the tip of the rod (10). The hollow portion (13) of the rod (10) communicates with the region outside the rod (10) (the region 101 in the ground).
Therefore, the devices (7, 7B, 8) necessary for the work after drilling (for example, injection by the sleeve tube 7 or the chemical solution injection tube 7B, measurement using the measurement device 8) are hollow inside the rod (10). The portion (13) is moved, passes through an opening formed at the tip of the rod (10) (the portion after the closing members 3, 3A are pushed out), and is an underground region outside the rod (10). (Underground region 101) can be reached. As a result, the work after drilling can be executed by the necessary equipment (7, 7B, 8) in the underground area (underground area 101) outside the rod (10).

Here, when the necessary devices (7, 7B, 8) reach the underground region (101), the rod (10) remains in the ground, and the devices (7, 7B, 8). Moves in the hollow part (13) inside the rod (10).
And since the rod (10) remains in the ground, even if the soil excavated through the borehole (100) is soft and easily collapses or collapses, the hollow portion (13) inside the rod (10) is It is secured as a route for movement of the devices (7, 7B, 8).
And even if earth and sand or muddy water is generated from the soil by excavation of the borehole (100), it does not flow into the hollow portion (13) inside the rod (10), or the hollow portion (13) by known means. If earth and sand and muddy water are removed from the inside, the device (7, 7B, 8) is moved within the hollow portion (13) inside the rod (10), and the underground area (underground) outside the rod (10) Area 101).
That is, according to the present invention, it is possible to prevent the drilled boring hole from collapsing or collapsing, and to ensure that the equipment necessary for the subsequent work reaches the planned location.

Furthermore, according to the present invention, the closing member (3, 3A) is not pushed out to the area outside the rod (10) (the underground area 101) and returned to the ground side.
Therefore, there is no need to perform the work of collecting the closing member (3) on the ground side, and the equipment (7, 7B, 8) required for the work after drilling is immediately performed after the closing member (3) is pushed out. It is possible to reach a predetermined location (region 101) in the ground.
Therefore, at least after the drilling is completed, it is possible to save time for collecting the closing member (3) on the ground side, and work can be shortened and made efficient.

In addition, according to the present invention, the closing member (tip core portion 3) is fixed to the rod (10) by fixing means (for example, the shear pin 20), and the closing member (3) is pressed and fixed. Unless the means (e.g. shear pin 20) is shear broken, the closure member (3, 3A) will not move relative to the rod (10) (push out into the underground area 101 outside the rod 10).
The conditions for pressing the closing member (3) until the fixing means (20) is shear broken can be set accurately in advance.
Therefore, according to the present invention, the closing member (3, 3A) is placed in the area outside the rod (10) (the underground area 101) in the underground area other than the planned location (the underground area 101 outside the rod 10). And the tip of the rod (10) is prevented from opening.
In other words, drilling by so-called “curved boring” is preferably performed in the same manner as the existing “curved boring” technique.

It is sectional drawing which shows 1st Embodiment of this invention. In 1st Embodiment, it is a figure which shows the state which the press member contact | abutted to the closure member. In 1st Embodiment, it is a figure which shows the state which extruded the closing member from the boring rod front-end | tip. FIG. 2 is a cross-sectional view taken along the line XX in FIG. 1. It is an enlarged side view of a shear pin. It is sectional drawing which shows 2nd Embodiment. It is sectional drawing which shows 3rd Embodiment. In 3rd Embodiment, it is sectional drawing of the state which the press member contacted the closure member. It is sectional drawing which shows the apparatus which measures the advancing direction of a boring rod. It is sectional drawing which shows 4th Embodiment. It is process drawing which shows the process of drilling a boring hole. It is process drawing which shows the process of expanding the front-end | tip part of a boring hole. It is process drawing which shows the process of pressing the press member which contacted the closing member. It is process drawing which shows the process of pushing a closing member ahead. It is process drawing which shows the process of pushing out a closing member from the front-end | tip. It is process drawing which shows the state which made the sleeve pipe | tube reach ahead rather than the front-end | tip part of a boring rod. It is process drawing which shows the state which pulled out the boring rod after inserting a sleeve pipe | tube. It is process drawing which shows the process of partially obstruct | occluding a boring hole with a packer. It is process drawing which shows injection | pouring of the 1st step | paragraph of a chemical | medical solution. It is process drawing which shows the process of moving a sleeve pipe | tube to the tuyere side after the 1st step | paragraph injection | pouring. It is process drawing which shows injection | pouring of the 2nd step | paragraph of a chemical | medical solution. It is a figure which shows a chemical | medical solution injection tube. It is process drawing which shows the state which pulled out the boring rod after inserting a chemical | medical solution injection tube. It is process drawing which shows the process of starting the injection | pouring of the 1st step | paragraph of a chemical | medical solution. It is process drawing which shows the state which the area | region of the tuyere side consolidated by the 1st step | paragraph injection | pouring. It is process drawing which shows the state to which the area | region on the face side was consolidated by 1st step | paragraph injection | pouring. It is process drawing which shows the process of moving a chemical | medical solution injection tube to a tuyere side after 1st injection | pouring. It is process drawing which shows the state which the area | region of the tuyere side consolidated by the injection | pouring of the 2nd step | paragraph. It is process drawing which shows the state by which chemical | medical solution is inject | poured into a face side area | region by injection | pouring of the 2nd step | paragraph. It is sectional drawing which shows the jack system which draws out a chemical | medical solution injection tube to the ground side. It is sectional drawing which shows the state which hold | gripped the chemical | medical solution injection tube with the jack system of FIG. It is sectional drawing which shows the state which is moving the chemical | medical solution injection tube to the ground side with the jack system of FIG. It is sectional drawing which shows the state which canceled the holding | grip of the chemical | medical solution injection tube after moving a chemical | medical solution injection tube to the ground side. It is sectional drawing which shows the state which contracted the jack in the state of FIG. It is process drawing which shows the state which takes out the instrument for measurement from the front-end | tip of a boring rod, and is measuring. It is process drawing which shows the state which accommodated the instrument for measurement in the inside of a boring rod. It is process drawing which shows the state which has moved the boring rod to the tuyere side in the state which accommodated the apparatus for measurement.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings (FIGS. 1 to 37).
1 to 37, the same members are denoted by the same reference numerals.

The illustrated embodiment is, for example,
(A) After excavating a predetermined region by bending boring, inserting a sleeve tube equipped with a packer or other type of chemical solution injection tube and injecting a solidified material or other chemical solution;
(B) Inserting a TV camera into a curved bowling to check the ground condition,
(C) Work to conduct magnetic exploration by inserting a magnetic exploration device into a curved boring,
(D) Inserting a sampling device into a curved boring and collecting it (sampling of the ground),
Etc. are applicable.

Here, the insertion of the sleeve tube or other chemical solution injection tube of item (a) described above is performed in order to enable efficient chemical solution injection in the chemical solution injection method.
The insertion of the TV camera of item (b) is performed in order to grasp the state of the tip of the excavation hole and the position of the excavation hole tip by the inserted TV camera. There is an advantage that construction can be performed while confirming an accurate excavation route.
In item (c), the magnetic exploration device is a device for exploring foreign matters (tubes, piles, etc.) present in the construction area. Since the position of an existing foreign object can be grasped, it is possible to excavate without interfering with the foreign object.
The sampling of the item (d) is an operation of collecting the soil of the ground to be excavated and analyzing the soil to grasp the properties of the construction ground in advance and enable proper construction.

First, a first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, the state which drilled the soil G to the predetermined distance by the flexible boring rod 10 (universal boring rod) is shown.
In FIG. 1, a boring rod 10 is provided with a correcting reaction force plate 2 and a closing member (hereinafter referred to as “tip core portion”) 3 at the tip.
In the figure, if it is immediately after excavation, the tip portion of the reaction plate 2 for correction becomes the outermost shell. The boring hole (the distance between the tip portion of the reaction plate 2 for correction and the center line (not shown) of the boring rod 10). A boring hole having a radius) is drilled. However, since the drilled soil immediately collapses, the bored hole is reduced in diameter to the outer surface of the boring rod 10 and the reaction plate 2 for correction as illustrated.

The boring rod 10 is a hollow tubular body having flexibility and a relatively small diameter, and the first rod 1, a plurality of connecting pipes 4 (only one is shown in FIG. 1), and illustration are omitted. It consists of rods after the second rod.
The first rod 1 has a hollow portion 12 at the tip (left end in FIG. 1) in the longitudinal direction (left and right direction in FIG. 1), a hollow portion 13 in the center, and a connecting portion 18. The connecting portion 18 is formed at the tuyere side end portion of the central hollow portion 13 in the first rod 1 and connects the connecting pipe 4.
An inclined flat end face 11 is formed at the tip of the first rod 1. A correction reaction force plate 2 is attached to the tip of the first rod 1. The reaction plate 2 for correction extends leftward and upward in FIG.
The hollow portion 12 at the tip of the first rod 1 has an inner diameter larger than that of the central hollow portion 13.

The boring rod 10 is configured as a “hollow” member over its entire length.
At the tip of the boring rod 10, the hollow portion 12 is formed so as to penetrate the end surface 11. The correction reaction force plate 2 is also formed with a hollow hole 2h.

In FIG. 1, the tip core portion 3 is disposed across the tip hollow portion 12 and the center hollow portion 13. The tip core portion 3 includes a tip portion 31, a center portion 32, and a tuyere side end portion 33.
The tip core portion 3 is configured such that the front surface 3f thereof is flush with the front surface 2f of the correction reaction force plate 2.

The distal end core portion 3 is arranged and inserted so as to block communication between the hollow portion 12 at the distal end of the first rod 1 and the hollow portion 13 at the center.
The distal core portion 3 is composed of a portion that is complementary to the shape of the hollow portion 12 and a portion that is complementary to the shape of the hollow portion 13. The radial dimension of the distal end portion 31 of the distal core portion 3 is the same as that of the hollow portion 12, and the radial dimension of the central portion 32 of the distal core portion 3 is the same as that of the hollow portion 13.

A center hole 34 is formed in the distal core portion 3 from the center of the tuyere side end surface (right end surface in FIG. 1) 3r of the distal core portion 3 along the central axis (of the distal core portion 3). The hole 34 is a blind hole.
In addition, a flow path 35 extending in the radial direction is formed in the distal core portion 3. The flow path 35 communicates with the center hole 34, extends in the radial direction, that is, in a direction orthogonal to the center hole 34, and reaches and opens the outer peripheral surface of the center portion 32 near the tip portion 31.
A ring groove 36 for interposing the O-ring 3O is formed on the outer peripheral surface (the outer peripheral surface of the central portion 32) in the region between the flow path 35 and the tuyere side end portion 33.

A flow path 14 is formed on the distal end side (left side in FIG. 1) of the first rod 1 and on the outer portion (radially outward portion). The channel 14 extends in the extending direction of the channel 35 (outward in the radial direction).
A hole water channel 15 is formed in the outer portion (radially outward portion) of the first rod 1, and the hole water channel 15 communicates with the channel 14.
The drilling water (drilling fluid) that has reached the hollow portion 13 in the first rod 1 is near the tip 11 of the first rod 1 via the center hole 34, the channel 35, the channel 14, and the drilling water channel 15. It is ejected from the drilled water discharge port 16 formed in the above.
The drilling water discharge port 16 is provided with a check valve 16V.

A female screw 18t is formed at the connection portion 18 at the tuyere side end of the first rod 1 (right side in FIG. 1). On the other hand, a male screw 41 is formed at the end of the connecting pipe 4 on the first rod 1 side (left side in FIG. 1).
In FIG. 1, a region 42 adjacent to the right side of the male screw 41 and including the incomplete screw portion has a diameter smaller than the outer diameter size of the outer diameter portion 43 of the connection pipe 4, but is larger than the diameter of the mountain of the male screw 41. Is also big. A ring groove 42 c for interposing the O-ring 4 O is formed on the outer peripheral surface of the connection pipe 4.
A female thread forming portion 45 is opened at the tuyere side end face 4 e of the connecting pipe 4, and a female thread 46 is formed in the female thread forming portion 45. A connecting pipe 4 (not shown) of the boring rod 10 is screwed into the female thread forming portion 45.

In FIG. 1, reference numeral 100 indicates a drilled borehole, and an arrow 50 indicates a tuyere side (ground side).
Further, in FIG. 1, reference numeral 44 indicates the inner peripheral surface of the hollow portion of the connection pipe 4. Here, the inner diameter of the inner peripheral surface 44 of the connecting pipe 4 is equal to the inner diameter of the central space portion 13 of the first rod 1.

As described above, the tip core portion 3 is composed of a portion that is complementary to the shape of the hollow portion 12 and a portion that is complementary to the shape of the hollow portion 13.
The radial dimension of the distal end portion 31 of the distal core portion 3 and the radial dimension of the central portion 32 are formed. Therefore, the tip core portion 3 can move to the front side of the first rod 1, that is, the face side (left side in FIG. 1), but does not move to the tuyere side (ground side) 50. This is because, for example, during excavation, the tip core 3 moves from the tip position shown in FIG. 1 to the tuyere side (right side in FIG. 1) due to earth pressure on the face side (left side in FIG. 1). Is meant to be prevented.

FIG. 2 shows a state in which the pressing member 5 is in contact with the end face 3r of the tip core portion 3 on the tuyere 50 side.
In FIG. 2, the pressing member 5 has a large diameter cylindrical portion 51 and a small diameter cylindrical portion 52.
The tip 52f of the small-diameter cylindrical portion 52 has a conical shape, and a ring groove 52c for interposing the O-ring 5O is formed in a region near the conical tip 52f in the small-diameter cylindrical portion 52.

The diameter of the small-diameter cylindrical portion 52 is in a clearance fitting relationship with the diameter of the center hole 34 of the tip core portion 3. When the small-diameter cylindrical portion 52 of the pressing member 5 is inserted into the center hole 34 of the tip core portion 3, the O-ring 5 O creates a pressure fluid between the inner peripheral surface of the center hole 34 and the outer peripheral surface of the small-diameter cylindrical portion 52. Sealed against (fluid filled in the hollow portion 13 or the like in order to press the pressing member 5 against the distal end core portion 3), so that the pressure fluid pressure leaks out through the flow paths 35, 14, and 15. It is installed to prevent it from happening.
For example, bentonite (muddy water) is used as the pressure fluid for pressing the pressing member 5 to the left in FIG. 2, and the pressure fluid is also used as a drilling fluid.
The diameter of the large-diameter cylindrical portion 51 is in a clearance fitting relationship with the diameter of the hollow portion 13 in the first rod 1.

In the state shown in FIG. 2, if the fluid pressure of the pressure fluid is increased and the force that presses the pressing member 5 toward the face (left side in FIG. 2) increases, the tip core portion 3 moves together with the pressing member 5. Then, the boring rod 10 is pushed out of the boring rod 10 (to the left in FIG. 2).
Here, the fluid pressure of the pressure fluid is increased, for example, by increasing the discharge pressure of a pump for discharging a pressure fluid disposed on the ground side.
FIG. 3 shows a state in which the tip core portion 3 and the pressing member 5 are pushed out (excluded) from the boring rod 10.
Refer to FIGS. 11 to 15 for excluding the tip core portion 3 and the pressing member 5 by extruding them out of the boring rod 10 (by pushing them from the hollow portions 12 and 13 of the first rod 1 toward the face). Will be described in detail when explaining the construction procedure.

The step before pushing the tip core portion 3 from the hollow portions 12 and 13 of the first rod 1 to the face side (left side in FIGS. 2 and 3), that is, the step of drilling the boring hole 100 by the boring rod 10 is performed. In doing so, the tip core portion 3 is engaged with the first rod 1 of the boring rod 10 by two shear pins (shear pins) 20.
As for the shear pin 20, the XX cross-sectional arrow shape of FIG. 1 is shown in FIG. 4, and the detailed side shape is shown in FIG.

In FIG. 5, the shear pin 20 has a head portion 21, a tip core engaging portion 22, and an intermediate constricted portion 23.
The entire head 21 has a cylindrical shape, and a male screw 24 is formed over the entire outer peripheral surface.
In the head portion 21, a hexagonal hole 25 is formed on an end surface 21 e of the boring rod on the outer side in the radial direction (the side away from the tip core engaging portion 22: right side in FIG. 5). When the tip core portion 3 is engaged with the first rod 1 of the boring rod 10, the shear pin 20 is tightened. For tightening the shear pin 20, a hexagon wrench, a flat-blade screwdriver or other instrument can be used.
The tip core engaging portion 22 is also cylindrical, and its diameter dimension is smaller than that of the head portion 21.

The intermediate constricted portion 23 between the head portion 21 and the tip core engaging portion 22 has a shear stress by appropriately setting the diameter of the smallest diameter portion (weakest cross section), the type of material, the manner of heat treatment, and the like. Can be set accurately.
In other words, the diameter of the minimum diameter portion of the intermediate constricted portion 23, the type of material, the manner of heat treatment, and the like are determined when a preset shearing force acts between the head 21 and the tip core engaging portion 22. The minimum diameter portion is designed to be sheared.

As shown in FIG. 4, the shear pins 20 are arranged at two points symmetrical with respect to the center point 1 </ b> C of the first rod 1.
The distal core engaging portion 22 of the shear pin 20 is fitted into a fitting hole 35 formed in the distal core 3, and the male screw 24 formed in the head 21 is screwed into the female screw 19 formed in the first rod 1. Match. And the insertion hole 35 and the internal thread 19 are comprised so that the circumferential direction position may become the same.
In FIG. 4, the minimum diameter portion of the constricted portion 23 in the shear pin 20 is located at the boundary between the first rod 1 and the tip core portion 3.
Therefore, when a predetermined force or more acts on the tip core portion 3 in a direction orthogonal to the paper surface in FIG. 4, the shear pin 20 shears and breaks at the minimum diameter portion (weakest cross section).

FIG. 6 shows a second embodiment of the present invention.
In the first embodiment described with reference to FIGS. 1 to 5, when the pressing member 5 is pressed toward the face, pressing is performed by supplying a high-pressure fluid and increasing the pressure.
On the other hand, in 2nd Embodiment of FIG. 6, the press rod 6 which is a mechanical means is used as a means to press the press member 5. FIG. That is, the pressing rod 6 is inserted from the tuyere side, abuts against the large-diameter cylindrical portion 51 of the pressing member 5, and is further pushed into the face side (left side in FIG. 6), whereby the pressing member 5 and the tip core portion 3 are moved. The first rod 1 is pushed to the outside (left side in FIG. 6).
Although not shown, in the second embodiment, the pressing member 5 can be eliminated if the tip portion of the pressing rod 6 can block the center hole 34 of the tip core portion 3. is there.
Other configurations and operational effects in the second embodiment of FIG. 6 are the same as those of the first embodiment of FIGS.

Next, a third embodiment of the present invention will be described with reference to FIGS.
In the first embodiment of FIGS. 1 to 5 and the second embodiment of FIG. 6, the tuyere side (the right side in FIGS. 1 to 3) end surface 3r of the tip core portion 3 has a central axis of the boring rod 10. It was vertical.
In contrast, in the third embodiment of FIGS. 7 and 8, the tuyere side end surface 3Ar of the tip core 3 </ b> A is inclined with respect to the central axis of the boring rod 10.

In FIG. 7, the tuyere side end portion 33 </ b> A of the tip core portion 3 </ b> A has a surface 3 </ b> Ar inclined with respect to a center axis (not shown) of the boring rod 10.
FIG. 8 shows a state in which the pressing member 5A is brought into contact with the inclined end surface 3Ar on the tuyere 50 side of the tip core portion 3A with respect to FIG.
In FIG. 8, the pressing member 5 </ b> A has a large diameter cylindrical portion 51 </ b> A, a small diameter cylindrical portion 52, and a tapered portion 53.
The tapered portion 53 is formed so as to connect the large diameter cylindrical portion 51 </ b> A and the small diameter cylindrical portion 52. The inclination angle of the tapered portion 53 matches the inclination angle of the inclined end surface 3Ar in the tip core portion 3A.

Here, the reason why the tuyere side end surface 3Ar of the tip core 3A is inclined with respect to the central axis of the boring rod 10 in the third embodiment of FIGS. 7 and 8 will be described with reference to FIG. To do.
It is extremely important to monitor the traveling direction of the correction reaction force plate 2 when the boring hole 100 is excavated by the boring rod 10 as planned.
In FIG. 9, the aspect which measures the rotation angle or inclination with respect to the central axis of the boring rod 10 of the reaction plate 2 for correction in 3rd Embodiment is shown.
If the inclination with respect to the central axis of the inclined end surface 3Ar of the tip core portion 3A is measured, the inclination with respect to the central axis of the correction reaction force plate 2 can be determined.

In FIG. 9, a device (measuring jig) 7 that measures the inclination (rotation angle) of the correction reaction force plate 2 with respect to the central axis has a large-diameter cylindrical portion 71 and a small-diameter cylindrical portion 72.
In the large-diameter cylindrical portion 71, the end surface on the tuyere 50 side (the right side in FIG. 9) is perpendicular to the central axis of the boring rod 10. On the other hand, the end face 71s on the face side (left side in FIG. 9) has a shape complementary to the tuyere side inclined face 3Ar of the tip core portion 3, and is inclined with respect to the central axis of the boring rod 10. ing.
The small-diameter cylindrical portion 72 of the measuring jig 7 protrudes from the center of the inclined end surface 71s of the large-diameter cylindrical portion 71 toward the face, and the tip 72f has a conical shape. And the small diameter cylindrical part 72 is comprised so that insertion in the center hole 34 of 3 A of front-end | tip core parts is possible.

The connecting rod 60 for measurement is connected to the center of the end surface 71r on the tuyere 50 side of the large-diameter cylindrical portion 71, and the tuyere side (right side in FIG. 9) end (not shown) of the measuring connecting rod 60 is, for example, Are connected to a measurement unit (not shown) provided on the ground side.
In the measuring jig 7, the small diameter cylindrical portion 72 is inserted into the center hole 34 of the tip core portion 3A, and the inclined surface 71s of the large diameter cylindrical portion 71 is in surface contact with the tuyere side inclined surface 3Ar of the tip core portion 3. Thus, the inclination direction of the inclined surface 71s (inclination direction or inclination angle with respect to the central axis of the boring rod 10) is measured.
A known tilt angle measurement technique can be applied to such a configuration.

In order to measure the rotation angle or inclination of the correction reaction force plate 2 with respect to the center axis of the boring rod 10 during the boring operation by the boring rod 10, if the boring rod 10 is excavated for a predetermined distance, the excavating operation is temporarily performed. Stop. And as shown in FIG. 9, the measurement jig 7 is set to the tuyere side end surface 3Ar of the front-end | tip core part 3A. That is, the small diameter cylindrical portion 72 of the measuring jig 7 is inserted into the center hole 34 of the tip core portion 3A, and the inclined surface 71s of the large diameter cylindrical portion 71 is in surface contact with the tuyere side inclined surface 3Ar of the tip core portion 3. Let the state be
In the state of FIG. 9, the measuring jig 7 can measure the inclination direction of the inclined surface 71 s (inclination direction or inclination angle with respect to the central axis of the boring rod 10).
Then, the inclination of the correction reaction force plate 2 and the traveling direction of the boring rod 10 can be accurately determined from the inclination direction of the inclined surface 71s (inclination direction or inclination angle with respect to the central axis of the boring rod 10).

As described with reference to FIG. 9, the inclination of the correction reaction force plate 2 and the traveling direction of the boring rod 10 are determined from the inclination direction or the inclination angle of the inclined surface 71 s of the measuring jig 7 with respect to the central axis of the boring rod 10. Desired. The inclination direction or inclination angle of the inclined surface 71 s in the measuring jig 7 is obtained by making surface contact with the inclined surface of the tuyere side inclined surface 3 Ar of the tip core portion 3.
That is, the tuyere side end surface 3Ar of the tip core 3A is tilted with respect to the central axis of the boring rod 10 because it has a shape complementary to the tuyere side end surface 3Ar and is capable of surface contact. This is because the traveling direction of the boring rod 10 is determined using the measuring jig 7 having 71s.

After digging to a predetermined location while determining the traveling direction of the boring rod 10 in the manner shown in FIG. 9 every time a predetermined distance is excavated, as shown in FIG. 7 and FIG. 8, the tapered portion 53 of the pressing member 5A is It is made to contact | abut to the inclined end surface 3Ar of the front-end | tip core part 3A.
The inclination angle of the taper portion 53 of the pressing member 5A coincides with the inclination angle of the inclined end surface 3Ar in the tip core portion 3A, and when the pressing member 5A is brought into contact with the tip core portion 3A, the pressing member 5A The tapered portion 53 is in contact (line contact) with the inclined end surface 3Ar of the tip core portion 3A.
By injecting the high-pressure fluid F from the tuyere 50 side and increasing the pressure, the pressing member 5A presses the tip core portion 3A toward the face side (left side in FIG. 8). At this time, since the tapered portion 53 of the pressing member 5A is in line contact with the inclined end surface 3Ar of the tip core portion 3A, the center axis of the boring rod 10 is not deviated with respect to the center axis of the boring rod 10. In parallel, the pressing member 5A presses the tip core portion 3A toward the face side (left side in FIG. 8).
The configurations and operational effects of the third embodiment shown in FIGS. 7 and 8 other than those described above are the same as those of the first embodiment shown in FIGS.

FIG. 10 shows the configuration of the fourth embodiment of the present invention.
In the third embodiment described with reference to FIGS. 7 to 9, the means for pressing the pressing member 5 </ b> A is the high-pressure fluid F.
On the other hand, in 4th Embodiment of FIG. 10, the press rod 6 similar to 2nd Embodiment of FIG. 6 is used as a means to press 5 A of press members.
Other configurations and operational effects of the fourth embodiment of FIG. 10 are the same as those of the third embodiment described with reference to FIGS.

Next, among the operations (a) to (d) described above,
(A) After excavating a predetermined area by bending boring, inserting a sleeve tube or other chemical solution injection tube equipped with a packer to inject a solidified material or other chemical solution;
Is explained in detail.

The drilling device of the first embodiment was used in the operation (a) of inserting a sleeve tube equipped with a packer and injecting a solidified material or other chemicals after excavating a predetermined region with a bent boring (boring rod) 10. The construction procedure in this case is shown in FIGS.
FIG. 11 shows a state in which the boring hole 100 is drilled to a predetermined position by a flexible boring rod 10 (using a known technique related to so-called “curved boring”).
When drilling, a high-pressure drilling fluid is supplied to the tip core portion 3 from the ground side through the hollow portion of the boring rod 10, and the center hole 34, the flow path 35, and the flow of the first rod 1 in the tip core portion 3 are supplied. Drilling is performed while injecting a high-pressure jet J onto the soil to be excavated via the paths 14 and 15 and the discharge hole 16.

When the drilling shown in FIG. 11 is completed, as shown in FIG. 12, the boring rod 10 is pulled back to the tuyere 50 side from the drilling position shown in FIG. In other words, in FIG. 11, so-called “excavation” is performed on the face side (left side of FIGS. 11 and 12) from the position shown in FIG. 12.
The code | symbol 101 in FIG. 12 has shown the hollow area | region which remained in the ground after pulling back the boring rod 10 to the tuyere side (right side of FIG. 12), and is an overexcavated area | region. In this specification, it may be described as “the region at the tip of the boring rod 10” or “the region at the tip of the boring hole”.
The length of the excessive digging is set so that the region 101 has a length sufficient to accommodate the tip core portion 3 pushed out from the boring rod 10 (the axial direction or the longitudinal length of the boring rod 10). The

In the step shown in FIG. 13, the pressing member 5 is inserted into the hollow portion of the boring rod 10 from the tuyere 50 side, a high-pressure fluid (for example, cutting fluid) is injected, and the small-diameter cylindrical portion 52 of the pressing member 5 is inserted into the tip. It is inserted into the center hole 34 of the core part 3.
Then, the left end surface of the large-diameter cylindrical portion 51 of the pressing member 5 is brought into contact with the tuyere side end surface 3r (see FIG. 1) of the closing member 3 by the pressure of the high pressure fluid.
In the step shown in FIG. 14, for example, the discharge pressure of a high-pressure fluid discharge pump (not shown) provided on the ground side is increased to increase the fluid pressure acting on the pressing member 5. As a result, the force with which the pressing member 5 presses the distal end core portion 3 increases, and the shear acting on the pair of shear pins 20 (see FIG. 4) that engaged the first rod 1 and the distal end core portion 3. Power also increases.
When the shearing force exceeds a preset value (the shear pin 20 is a value that breaks at the constricted portion 23), the shear pin 20 breaks at the constricted portion 23, and the tip core portion 3 moves in the first rod 1. Then, it is pushed out toward the outer region (region at the tip of the boring hole 100) 101 of the boring rod 10.

In the step of FIG. 15 following the step shown in FIG. 14, the pressing member 5 and the tip core portion 3 are further pushed into the face side (left side in FIG. 15) by the high pressure fluid, and the pressing member 5 and the tip core portion 3 are the boring rod 10. Is removed from the first rod 1 and pushed out into the region 101.
In FIG. 15 and subsequent figures, only the tip core portion 3 is displayed in the region 101 for simplification of illustration.

  In the illustrated embodiment, when the pressing member 5 and the tip core portion 3 are pushed by the pressing rod 6, for example, the tip portion of the pressing rod 6 is configured to be engageable with the pressing member 5, and the pressing rod 6 is grounded. By pulling back to the side, the pressing member 5 can be recovered to the ground side.

In a step (FIG. 16) following the step shown in FIG. 15, the sleeve tube 7 is inserted into the hollow portion of the boring rod 10 and fed so that the tip 7 t of the sleeve tube 7 protrudes toward the face of the first rod 1. Since the boring rod 10 remains in the soil, the sleeve tube 7 can be easily inserted because the hollow portion of the boring rod 10 is secured even if the soil drilled through the boring rod 100 collapses.
In the step shown in FIG. 17, after the tip 7t of the sleeve tube 7 reaches the space 101 on the face side of the first rod 1, the boring rod 10 is pulled out and collected on the ground side (the tuyere 50 side). FIG. 17 shows a state after the boring rod 10 is collected on the tuyere 50 side.
In FIG. 17, reference numeral 70 indicates a packer attached to the sleeve tube 7.

In the process of FIG. 18, the packer 70 is expanded in a state where the tip 7 t of the sleeve tube 7 reaches the space 101 on the face side of the first rod 1.
That is, an expansion fluid such as compressed air is supplied to the packer 70 attached to the sleeve tube 7 via a supply line (not shown), and the outer periphery of the packer 70 comes into contact with the inner wall surface of the boring hole 100. The packer 70 is inflated until the boring hole is completely closed.
In the process of FIG. 19, in a state where the packer 70 is expanded, for example, a solidified material K is ejected as a chemical solution from a plurality of nozzles 7n provided between the packer 70 and the tip 7t of the sleeve tube 7 to form a borehole. The solidified material K is filled in the region 101 at the 100 tip, and the solidified material K is injected into the surrounding soil.

In the process of FIG. 20, after filling and injecting the solidifying material K, the expansion fluid is discharged from the packer 70 (the packer 70 is contracted), and the sleeve tube 7 is pulled back to the tuyere 50 side.
In FIG. 20, the amount by which the sleeve tube 7 is pulled back to the tuyere 50 side is the length (so-called “1 pitch”) of one solidification material injection.
In FIG. 20, symbol KC indicates a state in which the solidified material K filled and injected is solidified.

In the step shown in FIG. 21 following the step of FIG. 20, the operation is performed at a position where the sleeve tube 7 is pulled back to the tuyere 50 side (so-called “one pitch”) from the state of FIG.
That is, as in the process of FIG. 19, the packer 70 is expanded, the solidified material K is ejected from the plurality of nozzles 7n, and the solidified material K is filled in the region between the sleeve tube 7 and the bore hole 100. The solidifying material K is injected into the surrounding soil.
Hereinafter, the same operation as described in FIGS. 19 to 21 is repeated, and the solidification material K is injected into the soil in the entire construction plan area.
About the operation | movement (a) shown in FIGS. 11-21, about another structure and an effect, it is the same as that of embodiment shown in FIGS.

The operation (a) of injecting the chemical solution by inserting the sleeve tube shown in FIGS. 11 to 21 is performed on the ground where the chemical solution can be sealed by the packer.
However, depending on the ground, there are cases where it is difficult to seal the chemical solution depending on the packer. Alternatively, there are cases where the packer is damaged by expansion and contraction. About such soil, chemical | medical solution injection | pouring as shown in FIGS. 11-21 is difficult.
22 to 29 show an operation of injecting a chemical solution under construction conditions where it is difficult to inject the chemical solution using a packer.

FIG. 22 shows a chemical liquid injection tube used in a chemical liquid injection operation performed under construction conditions in which chemical injection using a packer is difficult.
Similar to the sleeve tube 7 shown in FIGS. 11 to 21, the chemical solution injection tube 7 </ b> B shown in FIG. 22 includes a plurality of nozzles 7 n in a region near the tip of the face side (left side in FIG. 22).
However, the chemical solution injection pipe 7B does not include a packer, and a plurality of second nozzles 7n− arranged at equal intervals in the circumferential direction are provided at positions of the packer 70 of the sleeve pipe 7 shown in FIGS. S is provided.

Moreover, the chemical | medical solution injection tube 7B is comprised as a hollow member which has hollow part 7BI-1, and the outer shell part is shown by the code | symbol 7BA. A flow path 7BI-2 is formed in the outer shell portion 7BA, and the flow path 7BI-2 communicates with the plurality of second nozzles 7n-S.
Each of the plurality of second nozzles 7n-S is provided with a check valve RV. This is because the chemical liquid (solidification material) ejected from the second nozzle 7n-S is prevented from flowing back and solidified in the second nozzle 7n-S or the flow path 7BI-2. .

A hollow rod 7IR is inserted into the hollow portion 7BI-1 of the chemical solution injection tube 7B. A flow path 7IP is formed in the center of the hollow rod 7IR. In other words, the flow path 7IP in the center of the hollow rod 7IR communicates with the hollow portion 7BI-1.
As will be described later, in the path constituted by the flow path 7BI-2 and the plurality of second nozzles 7n-S, an instantaneous setting type solidifying material (solidifying material that solidifies in an early time: liquid A and liquid B are mixed. In the solidified material of the two-liquid mixing type that solidifies, the instantaneous setting type B liquid that solidifies in a short time flows.
On the other hand, in the path formed by the flow path 7IP in the center of the hollow rod 7IR and the hollow portion 7BI-1, a long-setting type solidifying material (solidifying material: a liquid A and a liquid B that have a relatively long time until solidification is mixed. Then, a liquid mixture of liquid A and liquid B in the two-liquid mixed type solidified material that solidifies, and a long-mixed liquid mixture) flows.
In FIG. 22, reference numeral 7 t indicates a tip portion of the chemical liquid injection tube 7B.

When performing the chemical solution injection operation using the chemical solution injection pipe 7B shown in FIG. 22, the tip core portion 3 of the boring rod 10 is moved to the region outside the boring rod 10 by the operation described with reference to FIGS. Extruded to the boring hole 100 tip region) 101.
Then, in the same manner as shown in FIG. 16, the chemical solution injection pipe 7 </ b> B is inserted into the hollow portion 13 of the boring rod 10 having an opening formed at the tip. If the chemical solution injection tube 7B is inserted, the boring rod 10 is pulled out to the ground side.
FIG. 23 shows a state corresponding to FIG. 17, and shows a state in which the boring rod 10 is pulled out after insertion of the chemical solution injection tube 7 </ b> B, and the chemical solution injection tube 7 </ b> B is disposed in the boring hole 100. 23 to 29, the illustration of the tip core portion 3 and the pressing member 5 (5A) pushed out from the boring rod 10 is omitted.

After pulling out the boring rod 10 (FIG. 23), the instantaneous setting type solidified material LBS is sprayed through a path constituted by the flow path 7BI-2 and the plurality of second nozzles 7n-S. Here, the instantaneous solidification material is a solidification material that hardens in an early time.
22 to 29, in the liquid injection operation described with reference to FIGS. 22 to 29, the instantaneous setting type solidifying material LBS is an instant of the two-liquid mixed type solidifying material that is solidified when two kinds of liquids (A liquid and B liquid) are mixed. A ligation type B liquid is used.
On the other hand, through the path formed by the flow path 7IP in the center of the hollow rod 7IR and the hollow portion 7BI-1, the nozzle 7n receives a long-solidification material (solidification material having a relatively long time until solidification). Be injected.
22 to 29, in the two-liquid mixing type solidifying material that solidifies when two types of liquids (A liquid and B liquid) are mixed as long-setting type solidifying materials, A long-mixed liquid mixture is used.

Part of the long-mixed liquid mixture of liquid A and liquid B ejected from the nozzle 7n flows toward the tuyere side (right side in FIG. 24) as indicated by the arrow AG, and the second nozzle 7n-S. To the region where the solidifying material LBS (instantaneous type B liquid) is jetted.
In the region where the solidifying material LBS (instantaneous type B liquid) is ejected from the second nozzle 7n-S, the liquid mixture of the liquid A and liquid B and the liquid type B is mixed. Solidify instantly.
In FIG. 25, a region in which the liquid mixture of liquid A and liquid B and the liquid B of the instantaneous setting type are mixed and solidified (the solidified material that is the liquid B of the instantaneous setting type from the second nozzle 7n-S). The region where the LBS is injected is indicated by the symbol KCS.

In FIG. 25, even if a part of the liquid mixture of liquid A and liquid B ejected from the nozzle 7n flows toward the tuyere side (right side in FIG. 24) as indicated by an arrow AG, the liquid is solidified. Therefore, the solidified region KCS does not flow out to the tuyere side.
Therefore, as shown in FIG. 26, the liquid mixture LABL of the liquid A and liquid B ejected from the nozzle 7n does not flow out to the tuyere side (right side in FIG. 26), and the periphery of the chemical liquid injection tube 7B. Injected and penetrated into the area. In FIG. 26, the region into which the liquid mixture (solidification material) LABL of the liquid A and liquid B sprayed from the nozzle 7n is injected is indicated by the symbol KCL.
In the region KCL, the solidified material LABL is solidified when a relatively long consolidation time has elapsed.

After injecting the solidifying material LABL into the region KCL, before the injection region KCL is solidified, as shown in FIG. 27, the chemical solution injection tube 7B is pulled out (retracted) to the tuyere 50 side (right side in FIG. 27). The withdrawal amount (retraction amount) is the length of one solidification material injection (so-called “1 pitch”), and is the length in the longitudinal direction of the chemical injection tube 7B in the region KCL.
If the chemical solution injection tube 7B is pulled out toward the tuyere 50 by a so-called “1 pitch” (the length in the longitudinal direction of the chemical solution injection tube 7B in the region KCL), as shown in FIG. 28, the second nozzle 7n The solidifying material LBS, which is an instantaneous type B liquid, is injected from the S to the area KCS to solidify the area KCS.
As described with reference to FIGS. 25 and 26, when the region KCS is solidified, the liquid A and B liquid mixture (solidification material) LABL ejected from the nozzle 7n is closer to the tuyere than the region KCS. Does not flow out and is injected into the surrounding soil as shown in FIG.
Hereinafter, the steps shown in FIGS. 27 to 29 are repeated, and the long-mixed mixed liquid (solidifying material) LABL of the liquid A and the liquid B injected from the nozzle 7n is injected over the entire planned construction region.

22 to 29, since it is not necessary to use a packer, it is difficult to seal the injected chemical solution with the packer, and the ground in which the chemical solution flows out to the tuyere side region than the packer. Can also be applied.
Alternatively, the present invention can be applied even at a construction site where the packer is damaged due to expansion and contraction.
And it can prevent that an injection | pouring chemical | medical solution flows out to the area | region of a tuyere side rather than the area | region KCS which instantaneously connects.

For example, an existing jack having a hollow structure called a center hole jack can be used to pull out the chemical solution injection pipe 7B described above toward the tuyere side. When the center hole jack is used, the chemical solution injection pipe 7B is held by a device called a rod holder, and the rod holder and the chemical solution injection pipe 7B are pulled out to the ground side at the same time.
However, since the existing center hole jack is heavy and generates a high pressure, it is not easy to handle. In addition, since a separate rod holder must be used, the labor for parts management is increased.
On the other hand, if it is the jack system shown by FIGS. 30-34, the chemical | medical solution injection tube 7B can be suitably pulled out to the ground side, without producing the above problems.

In FIG. 30, the entire jack system for pulling out the chemical solution injection pipe 7 </ b> B is denoted by reference numeral 110. The jack system 110 includes a jack 112 and a rod holder 114.
The jack 112 has a cylinder 116 (jack cylinder) and a piston 118 (jack piston). A rod holder 114 is fixed to the rod tip of the jack piston 118.
The rod holder 114 has a cylinder 120 (cylinder for holder) and a piston 122 (piston for holder), and the tip of the piston for holder 122 constitutes a holder 124 that holds the chemical solution injection pipe 7B. .

In the jack cylinder 116, a hydraulic line La1 communicates with the internal space 116a on the rod holder 114 side (left side in FIG. 30). The hydraulic line Lb1 communicates with the internal space 116b (see FIGS. 32 and 33) on the opposite side of the jack cylinder 116 from the rod holder 114 (right side in FIG. 30: see FIGS. 32 and 33). .
In the holder cylinder 120, a hydraulic line La2 communicates with the internal space 120a on the side of the chemical solution injection pipe 7B (inward in the radial direction in FIG. 30). A hydraulic line Lb2 is provided in the internal space 120b (see FIGS. 31 and 32) of the holder cylinder 120 opposite to the chemical solution injection pipe 7B (radially outward in FIG. 30: see FIGS. 31 and 32). Communicate.

When the chemical injection pipe 7B is pulled out by the jack system 110, as shown in FIG. 30, the chemical injection pipe 7B is passed through the internal space of the jack system 110, and the jack system 110 is fixed to the wall surface 50S of the tuyere.
Then, as shown in FIG. 31, pressure oil is supplied to the internal space 120b of the rod cylinder 120 via the hydraulic line Lb2 (arrow AP31), and the pressure oil in the internal space 120a is discharged via the hydraulic line La2 ( Arrow AD31). As a result, the holder piston 122 moves in the arrow A31 direction, and the chemical injection pipe 7B is held by the holder 124.

In the state where the chemical liquid injection pipe 7B is held by the rod holder 114, the hydraulic lines La2 and Lb2 are closed as shown in FIG.
Then, pressure oil is supplied to the internal space 116 of the jack cylinder 116 via the hydraulic line Lb1 (arrow AP32), and the pressure oil in the internal space 116a (see FIGS. 30 and 31) is discharged via the hydraulic line La1. (Arrow AD32).
As a result, the piston 118 extends, the tip thereof moves to the ground side (right side in FIG. 32), and the chemical solution injection pipe 7B held by the rod holder 114 at the tip of the piston 118 is also pulled out to the ground side. Here, the drawing amount of the chemical solution injection pipe 7B is equal to the stroke of the piston 118.

Next, as shown in FIG. 33, pressure oil is supplied to the internal space 120a of the rod holder 114 via the hydraulic line La2 (arrow AP33), and the pressure oil is discharged from the internal space 120b (see FIGS. 30 to 32). (Arrow AD33).
As a result, the piston 122 of the rod holder 114 moves in the direction of the arrow A33, and the state where the holder 124 holds the chemical solution injection pipe 7B is released.
In the state of FIG. 33, the hydraulic lines La1 and La2 are closed.

If the holding | maintenance of the chemical | medical solution injection tube 7B by the rod holder 114 is cancelled | released, as shown in FIG. 34, pressurized water will be supplied from the line La1 to the internal space 116a of the jack 112 (arrow AP34), and the internal space will be via the line La2. The pressure oil 116b (see FIG. 33) is discharged (arrow AD34).
As a result, the piston 118 of the jack 112 contracts.
In FIG. 34, the hydraulic lines La2 and Lb2 are closed.
Thereafter, each time the steps shown in FIGS. 30 to 34 are repeated, the chemical injection pipe 7B is pulled out to the ground side (right side in FIGS. 30 to 34) for each stroke of the piston 118 of the jack 112.

In the jack system 110 shown in FIGS. 30 to 34, the pressure of the pressure oil supplied to the jack 112 is much smaller than that of the center hole jack, and the danger in work is extremely small.
And since the rod holder 114 is integrated with the piston 118, parts management is very easy compared with the case where a center hole jack and a rod holder are used.

Next, referring to FIG. 35 to FIG. 37, a rod 7a having a measuring device 8 (for example, a TV camera, a magnetic exploration device, a pore water pressure measuring device, etc.) attached to the tip is inserted, and the ground condition is necessary. A description will be given of a case where an operation for performing a simple measurement (for example, the above-described operation b, operation c, pore water pressure measurement operation, etc.) is performed.
Prior to the step shown in FIG. 35, the tip core portions 3, 3 </ b> A are removed from the boring rod 10 in the same manner as described with reference to FIGS. 1 to 15. Then, a measuring device 8 (TV camera, magnetic exploration device, pore water pressure measuring device, etc.) necessary for the measurement work is inserted into the hollow portion 13 inside the boring rod 10 and moved to the tip of the boring rod 10.
Then, as shown in FIG. 35, the measuring device 8 is put out to the underground region outside the tip of the boring rod 10 (right side in FIG. 35), and necessary measurement (for example, ground condition confirmation by a TV camera, magnetic field) Magnetic survey by insertion of exploration device, measurement of pore water pressure by pore water pressure measurement device, etc.).

When necessary measurements (for example, ground condition confirmation, magnetic exploration, pore water pressure measurement) are completed, the measuring device 8 and the boring rod 10 are moved relative to each other, and the measuring device 8 is accommodated inside the boring rod 10 ( FIG. 36).
In FIG. 36, the rod 7 a equipped with the measuring device 8 is moved to the tuyere side (arrow 50 side) with respect to the boring rod 10. However, the measuring device 8 may be accommodated by moving the boring rod 10 to the face side (opposite the arrow 50).

Then, with the measuring device 8 housed inside the boring rod 10, as shown in FIG. 37, the measuring device 8 and the boring rod 10 are moved to the tuyere side (arrow 50 side) (in other words, Pull it to the ground side) and move to the next measurement position.
Here, the “next measurement position” that moves in the step shown in FIG. 37 is located closer to the tuyere side (arrow 50 side) than the position where the measurement was performed in FIG.

When the measuring device 8 and the boring rod 10 reach the next measurement position, the rod 7a on which the measuring device 8 is mounted is moved to the face side (opposite to the arrow 50) with respect to the boring rod 10. Alternatively, the boring rod 10 is moved to the tuyere side (arrow 50 side). That is, the rod 7a equipped with the measuring device 8 and the boring rod 10 are relatively moved. Then, in the same manner as shown in FIG. 35, the measuring device 8 is brought out to the ground area outside the tip of the boring rod 10 (right side in FIG. 35), and necessary measurement (for example, ground condition confirmation by a TV camera) is performed. Magnetic exploration by inserting magnetic exploration device, measurement of pore water pressure by pore water pressure measurement device, etc.).
Hereinafter, the steps of FIGS. 35 to 37 are repeated, and necessary measurement is performed at the measurement point of the boring hole 100 between the face tip and the tuyere.

If measurement is performed in the steps shown in FIG. 35 to FIG. 37, even if the soil is easy to collapse, the measurement device 8 is accommodated in the boring rod 10 to move to a necessary measurement location and perform measurement. I can do it.
Regarding other configurations and operational effects, the measurement work shown in FIGS. 35 to 37 is the same as that described with reference to FIGS.

According to the illustrated embodiment, by pushing the tip core portions 3, 3 </ b> A to the extended region 101 at the tip of the boring hole 100, the necessary equipment as described above (e.g., via the hollow portion 13 of the boring rod 10 (for example, The sleeve tube 7, the chemical solution injection tube 7B, and the measuring device 8) can be positioned at the rod tip.
At that time, the hollow part inside the boring rod 10 can secure the moving path of the above-mentioned necessary devices (sleeve tube 7, chemical injection tube 7B, measuring device 8), so that the soft ground collapses, etc. Even if it raise | generates, the said required apparatus (7, 7B, 8) can be arrange | positioned to a predetermined location, and it can collect | recover on the ground side. And since a foreign material cannot enter the said hollow part 13 easily, there is no possibility that the movement of an apparatus will be prevented by a foreign material.

Further, the tip core portion 3 closing the tip of the boring rod 10 is pushed out to the face side and is not collected on the tuyere side (the ground side).
That is, the equipment (7, 7B, 8) necessary for the work is immediately after drilling the necessary boring hole without collecting the tip core portion 3 on the tuyere side (ground side) after drilling the boring hole. Through the hollow portion 13 of the boring rod 10, it can be sent to a necessary portion at the tip of the boring rod 10.
Therefore, the work can be shortened and the efficiency can be improved.

  It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... 1st rod 2 of a boring rod 2 ... Reaction force plate 3 for correction, 3A ... Closing member / front-end | tip core part 4 ... Connecting member 5 of a boring rod 5, 5A ... Pressing member 6 .... Pressing rod 7 ... Sleeve tube 7a ... Rod 7B ... Chemical liquid injection tube 8 ... Measurement device 10 ... Boring rod 12 ... Hollow part 13 at the tip 13 ... Hollow at the center Portion 14 ... Drilling fluid channel 15 ... Drilling water discharge port 20 ... Shear pin 34 ... Center hole 50 ... Tuyere 70 ... Packer 100 ... Boring hole 101 · ..Area of boring hole tip

Claims (4)

  In a drilling method in which a boring hole is drilled using a flexible hollow rod provided with a drilling means and a drilling direction control means at the tip, the hollow portion inside the rod has a flow path for drilling fluid. A closing member configured to close the tip of the rod is fixed to the rod by a fixing means; a drilling step for drilling a ground by injecting a drilling fluid from the drilling means; and a closing member The process of pressing and shearing the fixing means to push the closing member to the area outside the rod, and inserting the equipment necessary for the work after drilling into the hollow part inside the rod and moving it to the tip of the rod A drilling method characterized by comprising a step of:   2. The step of extruding the closing member includes a step of inserting a pressing member into a hollow portion inside the rod and bringing the pressing member into contact with the closing member, wherein the closing member is pressed via the pressing member. Hole construction method.   The drilling method according to any one of claims 1 and 2, wherein the tuyere side end portion of the closing member has a plane orthogonal to the central axis of the closing member.   The drilling method according to any one of claims 1 and 2, wherein the tuyere side end of the closing member has a flat surface inclined with respect to the central axis of the closing member.

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