JP7809356B2 - Horizontal hole formation method - Google Patents

Description

The present invention relates to a method for forming a horizontal hole.

To prevent landslides, a known drainage well construction method involves drilling a vertical shaft (drainage well) of a specified depth into the natural ground, and then driving a double-tube rod consisting of an outer casing and an inner rod with a drill head at the tip from inside the shaft using, for example, a rotary percussion drill-type driving device (a new double-tube rod is added and driven behind the existing rod depending on the excavation length), thereby forming a specified number of horizontal boreholes in the natural ground for draining groundwater (see Figures 7 and 8 of Patent Document 1, etc.).

In these types of drainage well construction, the work of attaching the double-tube rod to the propulsion device inside the shaft is usually done manually by one or two workers due to the limited working space.

For example, a double-tube rod with a length of 1 m and a diameter of 96 mm to 165 mm weighs approximately 30 kg to 80 kg, and the task of transporting the double-tube rod from its temporary storage location to the propulsion device and attaching it places a significant physical burden on the worker (particularly on the lower back). Furthermore, after the horizontal borehole has been drilled, the double-tube rod also needs to be transported manually to be retrieved.

JP 2013-36177 A

The present invention was developed in consideration of the current situation described above, and aims to provide an unprecedented method for forming horizontal holes that reduces the physical burden on workers when transporting and installing double-tube rods.

The gist of the present invention will be explained with reference to the attached drawings.

A horizontal hole forming method for drilling a horizontal hole 3 in a natural ground 2 by propelling a double-tube rod 1 consisting of an outer tube and an inner tube,
a shaft forming step of forming a shaft 4 in the natural ground 2;
an apparatus installation step of installing a propulsion device 5 for propelling the double-tube rod 1 in the vertical shaft 4 and installing an auxiliary device 10 for assisting in the transportation of the double-tube rod 1;
an attachment step of transporting the double-tube rod 1 using the auxiliary device 10 and attaching it to the propulsion device 5;
a horizontal hole forming step of drilling and forming the horizontal hole 3 from the inner wall of the vertical shaft 4 by propelling the double-tube rod 1 attached to the propelling device 5,
The auxiliary device 10 includes a support member 11, a rotating arm member 12 attached to the support member 11 so as to be freely rotatable horizontally and protruding in a direction intersecting the support member 11, a hanging biasing member 13 supported by the rotating arm member 12, and a rod holding member 14 capable of holding the double-tube rod 1 and pulled upward by the hanging biasing member 13 ,
In addition, the double-tube rod 1 is used by sequentially connecting additional double-tube rods 1 to the rear.
The mounting process relates to a horizontal hole forming method characterized in that the double-tube rod 1 to be mounted on the propulsion device 5 is held by the rod holding member 14, and then the rod holding member 14 and the double-tube rod 1 are moved to above the propulsion device 5 while the rotating arm member 12 is rotated in response, and connected to the rear of the double-tube rod 1 that has already been propelled, and the holding is released .

The present invention also relates to a horizontal hole forming method as set forth in claim 1 , wherein the hanging biasing member 13 is supported so as to be movable in the protruding direction of the pivot arm member 12.

Furthermore, the method for forming a horizontal hole described in claim 2 includes a removal step of pulling out the double-tube rod 1 from the horizontal hole 3 and removing it from the propulsion device 5 after the horizontal hole forming step, and is characterized in that the double-tube rod 1 is transported using the auxiliary device 10 during the removal step.

Furthermore, in the horizontal hole forming method described in any one of claims 1 to 3 , the propulsion device 5 is provided with a support fixing portion 9 to which the support member 11 of the auxiliary device 10 is fixed, the auxiliary device 10 is provided with an attachment leg portion that can be attached and detached to the support fixing portion 9, and the auxiliary device 10 is fixedly installed on the propulsion device 5 and used.

The present invention also relates to a method for forming a horizontal hole according to any one of claims 1 to 3 , characterized in that the hanging biasing member 13 is a spring balancer.

Furthermore, in the method for forming a horizontal hole described in any one of claims 1 to 3 , the rod holding member 14 is provided with a pair of hook-shaped portions 38 having receiving surfaces curved in an arc shape so as to fit along the outer peripheral surface of the double-tube rod 1.

As described above, the present invention provides an unprecedented method for forming horizontal holes that reduces the physical burden on workers when transporting and installing double-tube rods.

FIG. 1 is a schematic explanatory diagram of the present embodiment. FIG. 2 is a schematic explanatory perspective view of the auxiliary device 10. 1 is a schematic explanatory side view of an auxiliary device 10. FIG. FIG. 10 is a perspective view illustrating a cross-hole forming step. FIG. 10 is a perspective view illustrating a mounting process. FIG. 10 is a perspective view illustrating a mounting process.

The preferred embodiment of the present invention will be briefly explained below, illustrating its operation with reference to the drawings.

For example, a propulsion device 5 and an auxiliary device 10 are placed inside a vertical shaft 4 formed in the natural ground 2, and a double-tube rod 1 is attached to the propulsion device 5 and excavated to form a horizontal hole 3 (horizontal borehole).

Here, the double-tube rod 1 is attached to the propulsion device 5 using the auxiliary device 10. Specifically, when the double-tube rod 1 is held by the rod holding member 14, the hanging biasing member 13 offsets some or all of the weight of the double-tube rod 1, leaving it suspended and held in place. This allows the worker to move the double-tube rod 1 together with the rod holding member 14 (the rod holding member 14 and hanging biasing member 13 rotate in response to the movement of the double-tube rod 1 via the pivoting arm member 12), allowing the double-tube rod 1 to be transported with its weight reduced. This also makes it easier to attach the double-tube rod 1 to the propulsion device 5 while maintaining a predetermined height (such as aligning the axis with the propulsion device 5 or connecting it to an existing rod).

The auxiliary device 10 can also be used to remove the double-tube rod 1 from the propulsion device 5 after the horizontal hole has been formed.

Therefore, according to the present invention, it is possible to reduce as much as possible the physical burden on workers when, for example, attaching or detaching the double-tube rod 1 to the propulsion device 5 inside the shaft 4.

Specific examples of the present invention will be described below with reference to the drawings.

This embodiment is an example of the application of the present invention to a case in which a vertical shaft 4 of a predetermined depth is formed in the natural ground 2, and excavation is performed by propelling a double-tube rod 1 from within the vertical shaft 4 using a propulsion device 5, thereby forming a horizontal borehole (horizontal hole 3) in the natural ground 2 for draining groundwater.

Specifically, as shown in FIG. 1, this embodiment includes a shaft forming process for forming a vertical shaft 4 in the natural ground 2 (FIG. 1(a)), an equipment installation process for installing a propulsion device 5 for propelling the double-tube rod 1 within the vertical shaft 4 and an auxiliary device 10 for assisting in the transportation of the double-tube rod 1, an attachment process for transporting the double-tube rod 1 using the auxiliary device 10 and attaching it to the propulsion device 5 (FIG. 1(b)), and a horizontal hole forming process for drilling and forming horizontal holes 3 from the inner wall of the vertical shaft 4 by propelling the double-tube rod 1 attached to the propulsion device 5 (FIG. 1(c)). This forms a predetermined number of horizontal holes 3 from the vertical shaft 4 (FIG. 1(d)).

The propulsion device 5 and auxiliary device 10 will be explained.

An existing drilling machine can be used as the propulsion device 5. That is, a double-tube rod 1 with a drilling blade 6 (drill bit) at its tip is attached and propelled a predetermined distance, and then a new double-tube rod 1 (without a drill bit) is connected to the rear of the existing rod that has already been propelled and propelled a predetermined distance, and this process is repeated until the predetermined excavation length is reached.

For example, a well-known rotary percussion drill type drilling machine can be used, which applies a propulsive force to the attached double-tube rod 1 as well as a rotational force and an impact force.

In this embodiment, as shown in Figure 4 and elsewhere, the tool is comprised of a hole-drilling unit 7, a support unit 8 that supports the hole-drilling unit 7 at a predetermined angle, and an operating unit (not shown) that operates the hole-drilling unit 7 and the support unit 8. The support unit 8 is provided with a support post fixing unit 9, which will be described later.

The drilling section 7 consists of a slide base 7a and a rod holding section 7b that is slidable in the front-to-rear direction on the slide base 7a and holds the double-tube rod 1.

The double-tube rod 1 held by the rod holding portion 7b is configured to be parallel to the slide base 7a. The rod holding portion 7b also has the function of moving the double-tube rod 1 in the forward and backward directions while holding it, as well as the function of rotating the double-tube rod 1 about its axis and striking the double-tube rod 1.

Therefore, by sliding the rod holding portion 7b forward relative to the slide base 7a, the double-tube rod 1 can be inserted into the ground 2 parallel to the slide base 7a and excavated. Furthermore, the double-tube rod 1 is used by sequentially connecting additional double-tube rods 1 to the rear, and the outer tube (outer casing) and inner tube (inner rod) of the most advanced double-tube rod 1 each have a digging blade 6 at the tip (subsequent double-tube rods 1 do not have digging blades).

In this embodiment, the rotary percussion drill type propulsion device 5 described above is used, but this is not limiting and other types of propulsion devices 5 may also be used.

As shown in Figures 2 and 3, the auxiliary device 10 includes a support member 11, a pivoting arm member 12 that is attached to the support member 11 so as to be freely pivotable horizontally and that protrudes in a direction intersecting the support member 11, a hanging biasing member 13 that is supported by the pivoting arm member 12, and a rod holding member 14 that can hold the double-tube rod 1 and is pulled upward by the hanging biasing member 13.

The support member 11 is made of a single pipe. In this embodiment, it is configured by connecting two single pipes 15 and 16 in parallel. The lower end of the support member 11 is provided with an attachment leg that can be detachably attached to the support fixing part 9. The attachment leg has a base plate 17, an angle part 18, and a clamp part (not shown), and the single pipe 15 is clamped to the clamp part welded to the back side of the angle part 18. In the figure, reference numeral 19 denotes a turnbuckle, 20 denotes an insertion hole for bolting to the support fixing part 9 provided on the support part 8 of the propulsion device 5, 21 denotes a fixing bolt that is inserted through the insertion hole 20 and the insertion hole provided in the support fixing part 9, and 42 denotes a reinforcing member.

The auxiliary device 10 of this embodiment can therefore be fixed to and used on the propulsion device 5. For example, the pillar fixing portion 9 is part of the support portion 8 and is configured to have a horizontal surface against which the base plate 17 abuts and an insertion hole through which the fixing bolt 21 is inserted, and the pillar fixing portion 9 is preferably positioned so that the pillar member 11 (swivel axis r) is disposed in the vicinity of the rod holding portion 7b of the propulsion device 5. In this case, it is also preferable that the forward/backward movement direction of the rod holding portion 7b and the temporary placement direction of the double-tube rod 1 are perpendicular to each other (see Figure 5, etc.).

The swivel arm member 12 is composed of a base 22 fixed to the upper end of the support member 11, and a frame-shaped swivel portion 24 connected to the base 22 via a pivot portion 23 so that it can rotate horizontally. A rail-like portion 25 is provided on the upper part of the swivel portion 24. In this embodiment, the rail-like portion 25 is made of a single pipe.

A hanging biasing member 13 is supported at the tip end of the rail-shaped portion 25 so that it can move freely in the protruding direction of the pivoting arm member 12 (the longitudinal direction of the rail-shaped portion 25).

The suspension biasing member 13 is a known spring balancer. The spring balancer is configured to include a wire 28 wound around a drum inside a case 27 and a spring that biases the wire 28 in the direction of winding.

The first hook portion 29 attached to the top of this spring balancer is hooked onto the hanging rod 31 of the pipe trolley 30, which is movably mounted on the rail-shaped portion 25 of the swivel arm member 12 (capable of running along the single-tube pipe using running rollers). Therefore, the hanging biasing member 13 is supported so that it can move freely in the direction of the protrusion of the swivel arm member 12. Reference numeral 26 in the figure denotes a stopper.

A second hook portion 33 is provided at the leading end of the spring balancer's wire 28, and the rod holding member 14 is attached to this second hook portion 33 via a swivel 34 (rewind) and a wire rope 35.

The capacity of the spring balancer (the tensile force of the wire 28) is set appropriately depending on the weight of the double-tube rod 1, etc. For example, it is set to a capacity that can offset approximately 50% to 80% of the weight of the double-tube rod 1. For example, if a 50 kg double-tube rod 1 is used, the capacity is set to approximately 30 kg. This makes it easy for a single worker to transport and install the double-tube rod 1, in accordance with the Ministry of Health, Labor and Welfare's guidelines for preventing lower back pain (when handling heavy objects).

The rod holding member 14 comprises a horizontal rod 36, annular wire rope attachment portions 37 attached to both ends of the horizontal rod 36, and a pair of hook-shaped portions 38 with receiving surfaces curved in an arc to fit along the outer periphery of the double-tube rod 1.

Therefore, by inserting the pair of hook-shaped portions 38 from below the double-tube rod 1, the double-tube rod 1 can be held stably and can be moved relatively freely relative to the support member 11 via the rotating portion 24, pipe trolley 30, and swivel 34, making it possible to transport and install the double-tube rod 1 while constantly offsetting its weight with the spring balancer.

The following describes in detail each process performed using the above equipment. Note that although the worker is not shown in the drawings, the double-tube rod 1 is manually transported and installed using the auxiliary device 10.

The shaft formation process is carried out by known means, such as digging into the ground with heavy machinery (such as a shovel or clamshell) and placing a steel or reinforced concrete shaft 39 with a diameter of approximately 3 to 4 meters (Figure 1(a)). An opening 40 for forming a horizontal hole is provided in the shaft 39.

The equipment installation process is carried out by using a crane or similar device to transport the propulsion device 5 and auxiliary device 10 into the shaft 4. The propulsion device 5 and auxiliary device 10 may be disassembled, introduced into the shaft 4, and then assembled and installed. At this time, the double-tube rod 1 to be used is also placed in a temporary storage position. Reference numeral 41 in the figure denotes a temporary storage stand.

The installation process involves a worker manually transporting the double-tube rod 1 from the temporary placement position to the propulsion device 5 using the auxiliary device 10, and then installing it (Figure 1(b)).

Specifically, the installation process involves first holding the double-tube rod 1 to be installed on the propulsion device 5 in the rod holding member 14 (Figure 5), then grasping the double-tube rod 1, and moving the rod holding member 14 and the double-tube rod 1 above the propulsion device 5 while rotating the rotating arm member 12 accordingly, and installing them in the rod holding section 7b (the second and subsequent double-tube rods 1 are also connected to the rear of the double-tube rod 1 that has already been propelled (Figure 6)), and then releasing the hold.

The horizontal hole forming process involves advancing a double-tube rod 1 attached to a propulsion device 5 (through the opening 40 of the well shaft 39) to perform excavation. The attachment process and horizontal hole forming process are repeated to excavate a horizontal hole 3 of a predetermined distance (Figure 1(c)). The horizontal hole 3 may be horizontal or inclined. For example, it may be inclined at an angle of 3° to 10° (downward toward the collection well) to promote downstream flow, or it may be inclined upward toward the collection well.

In addition, work efficiency can be improved by holding the next double-tube rod 1 to be installed in the rod holding member 14 during the horizontal hole forming process.

Once the horizontal hole 3 has been excavated to the specified distance, a removal process is performed in which the double-tube rod 1 is pulled out of the horizontal hole 3 and removed from the propulsion device 5. This removal process is also performed with the weight of the double-tube rod 1 reduced by the auxiliary device 10. In other words, the removal from the rod holding portion 7b, the disconnection from the previous double-tube rod 1, and the transportation from the propulsion device 5 to the temporary storage location are all performed with the weight reduced by the auxiliary device 10.

After the removal process, similar horizontal holes 3 are formed in other locations as needed. Once the required number of horizontal holes 3 have been formed, the propulsion device 5, auxiliary device 10, etc. are removed from inside the vertical shaft 4 (Figure 1(d)).

In addition, after removing the double-tube rod 1, a vinyl chloride pipe or steel pipe may be installed in the horizontal hole 3 as appropriate.

Furthermore, while this embodiment describes the case where a horizontal hole 3 is formed from within a vertical shaft 4, the present invention can also be applied to cases where a horizontal hole 3 is formed on a natural slope or face (on the ground without forming a vertical shaft 4).

As described above, in this embodiment, the double-tube rod 1 is attached to the propulsion device 5 using the auxiliary device 10. When the double-tube rod 1 is held by the rod holding member 14, the hanging biasing member 13 offsets some or all of the weight of the double-tube rod 1, leaving it suspended and held in place. By moving the double-tube rod 1 together with the rod holding member 14 (the rod holding member 14 and hanging biasing member 13 rotate and move in accordance with the movement of the double-tube rod 1 via the pivoting arm member 12), the worker can transport the double-tube rod 1 with its weight reduced. This also makes it easier to attach the double-tube rod 1 to the propulsion device 5 while maintaining a predetermined height (such as aligning the axis with the propulsion device 5 or connecting it to an existing rod).

The auxiliary device 10 can also be used to remove the double-tube rod 1 from the propulsion device 5 after the horizontal hole has been formed.

This embodiment therefore represents an unprecedented method of forming a horizontal hole, reducing the physical burden on workers when attaching and detaching the double-tube rod 1 to the propulsion device 5 inside the shaft 4.

1 Double pipe rod 2 Ground 3 Horizontal hole 4 Vertical shaft 5 Pushing device 9 Support fixing part
10 Auxiliary equipment
11 Support member
12 Swivel arm member
13 Hanging biasing member
14 Rod holding member
38 Hook-shaped part

Claims (6)

A horizontal hole forming method for drilling a horizontal hole in a natural ground by propelling a double-tube rod consisting of an outer tube and an inner tube,
a shaft forming step of forming a shaft in the natural ground;
an apparatus installation step of installing a propulsion device that propels the double-tube rod in the vertical shaft and installing an auxiliary device that assists in transporting the double-tube rod;
an attachment step of transporting the double-tube rod using the auxiliary device and attaching it to the propulsion device;
a horizontal hole forming step of drilling and forming the horizontal hole from the inner wall portion of the vertical shaft by propelling the double-tube rod attached to the propelling device,
The auxiliary device includes a support member, a pivot arm member attached to the support member so as to be freely pivotable horizontally and protruding in a direction intersecting the support member, a hanging biasing member supported by the pivoting arm member, and a rod holding member capable of holding the double-tube rod and pulled upward by the hanging biasing member ,
In addition, the double-tube rod is used by sequentially connecting additional double-tube rods to the rear,
The method for forming a horizontal hole is characterized in that the installation process is a process in which the double-tube rod to be installed on the propulsion device is held by the rod holding member, and then the rod holding member and the double-tube rod are moved onto the propulsion device while the rotating arm member is rotated in response, and connected to the rear of the double-tube rod that has already been propelled, and the holding is released . 2. A method for forming a horizontal hole according to claim 1 , wherein said hanging biasing member is supported so as to be movable in the direction in which said pivot arm member projects. 3. The method for forming a horizontal hole according to claim 2 , further comprising a removal step of pulling the double-tube rod out of the horizontal hole and removing it from the propulsion device after the horizontal hole forming step, wherein the double-tube rod is transported using the auxiliary device during the removal step. A horizontal hole forming method according to any one of claims 1 to 3 , characterized in that the propulsion device is provided with a support fixing portion to which the support member of the auxiliary device is fixed, the auxiliary device is provided with an attachment leg portion that can be detachably attached to the support fixing portion, and the auxiliary device is fixedly installed on the propulsion device and used. 4. The method for forming a horizontal hole according to claim 1, wherein the hanging biasing member is a spring balancer. The horizontal hole forming method according to any one of claims 1 to 3 , characterized in that the rod holding member is provided with a pair of hook-shaped portions having receiving surfaces curved in an arc shape so as to fit along the outer peripheral surface of the double-tube rod.