Horizontal hole forming method

Abstract

To provide a novel horizontal hole forming method that can reduce the physical burden on a worker in transportation and installation of a double tube rod.SOLUTION: A horizontal hole forming method for excavating 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 includes an apparatus installation step of disposing a propelling device 5 for propelling the double tube rod 1 at a position near an excavation target and an auxiliary device 10 for assisting in 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 propelling device 5, and a horizontal hole forming step of propelling the double tube rod 1 attached to the propelling device 5 to excavate and form the horizontal hole 3 in the natural ground 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for forming a lateral hole. [Background technology]

[0002] A known type of drainage well construction prevents landslides by forming a vertical shaft (drainage well) of a specified depth in the natural ground, and then drilling from inside the shaft by pushing a double-tube rod consisting of an outer casing and an inner rod and having a drill head at the end into the shaft using, for example, a rotary percussion drill-type thruster (a new double-tube rod is added to the rear of the existing rod depending on the excavation length and thrust is repeated), forming a specified number of horizontal boreholes in the natural ground for draining groundwater (see Figures 7 and 8 of Patent Document 1, etc.).

[0003] In such a drainage well construction, the work of attaching the double-tube rod to the thruster inside the shaft is usually carried out manually by one or two workers because the working space is limited.

[0004] For example, a double-tube rod with a length of 1 m and a diameter of 96 mm to 165 mm weighs about 30 kg to 80 kg, and the work of transporting the double-tube rod from a temporary placement position to the propulsion device and attaching it to the device places a heavy physical burden on the worker (especially on the lower back). In addition, after the horizontal borehole is formed, the double-tube rod also needs to be transported by hand to be retrieved. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-36177 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the current situation as described above, and aims to provide an unprecedented method of forming a horizontal hole that can reduce the physical burden on workers when transporting and installing a double-tube rod. [Means for solving the problem]

[0007] The gist of the present invention will now be described with reference to the accompanying drawings.

[0008] 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, An apparatus installation process for installing a propulsion device 5 for propelling the double-tube rod 1 at a position near the excavation target and an auxiliary device 10 for assisting in the transportation of the double-tube rod 1; a mounting step of transporting the double tube rod 1 using the auxiliary device 10 and mounting it on the propulsion device 5; a horizontal hole forming step of drilling and forming the horizontal hole 3 in the natural ground 2 by propelling the double tube rod 1 attached to the propelling device 5, The auxiliary device 10 relates to a horizontal hole forming method characterized in that it includes a support member 11, a swivel 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 bias member 13 supported by the swivel arm member 12, and a rod holding member 14 capable of holding the double-tube rod 1 and biased upwardly by the hanging bias member 13.

[0009] The horizontal hole forming method according to claim 1 further comprises a shaft forming step of forming a vertical shaft 4 in the natural ground 2, an equipment arrangement step of arranging a propulsion device 5 for propelling the double tube rod 1 in the vertical shaft 4 and an auxiliary device 10 for assisting in the transportation of the double tube rod 1, the mounting step, and the horizontal hole forming step of propelling the double tube rod 1 mounted on the propulsion device 5 to excavate the horizontal hole 3 from the inner wall of the vertical shaft 4.

[0010] In addition, in the horizontal hole forming method described in claim 2, the double-tube rod 1 is used by sequentially connecting additional double-tube rods 1 to the rear, and 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 rotating the rotating arm member 12 in response, and connected to the rear of the double-tube rod 1 that has already been propelled, and the holding is released.

[0011] The present invention relates to a horizontal hole forming method as recited in claim 3, wherein the hanging biasing member 13 is supported so as to be movable in the protruding direction of the rotating arm member 12.

[0012] Furthermore, the method for forming a horizontal hole as described in claim 4 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.

[0013] The present invention also relates to a method for forming a horizontal hole as described in any one of claims 1 to 5, characterized in that the propulsion device 5 is provided with a pillar fixing portion 9 to which the pillar member 11 of the auxiliary device 10 is fixed, the auxiliary device 10 is provided with a mounting leg portion that can be freely attached and detached to the pillar fixing portion 9, and the auxiliary device 10 is fixedly installed on the propulsion device 5 and used.

[0014] The present invention relates to a horizontal hole forming method according to any one of claims 1 to 5, wherein the hanging biasing member 13 is a spring balancer.

[0015] Furthermore, in the method for forming a horizontal hole described in any one of claims 1 to 5, 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. Effect of the Invention

[0016] As described above, the present invention provides an unprecedented method for forming a horizontal hole that can reduce the physical burden on a worker in the work of transporting and installing a double tube rod. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic explanatory diagram of the present embodiment. [Diagram 2] FIG. 2 is a schematic explanatory perspective view of the auxiliary device 10. [Diagram 3] FIG. 2 is a schematic explanatory side view of the auxiliary device 10. [Figure 4] FIG. 13 is a schematic perspective view illustrating a horizontal hole forming step. [Diagram 5] FIG. 13 is a schematic explanatory perspective view of a mounting step. [Figure 6] FIG. 13 is a schematic explanatory perspective view of a mounting step. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] A preferred embodiment of the present invention will be briefly described below with reference to the drawings to illustrate the operation of the present invention.

[0019] For example, a propulsion device 5 and an auxiliary device 10 are arranged in 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 and propelled to form a horizontal hole 3 (horizontal borehole).

[0020] 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 double-tube rod 1 is held in a suspended state with the weight of the double-tube rod 1 being partially or entirely offset by the hanging biasing member 13, and the worker can move the double-tube rod 1 together with the rod holding member 14 (the rod holding member 14 and the hanging biasing member 13 rotate in accordance with the movement of the double-tube rod 1 by the rotating arm member 12), allowing the double-tube rod 1 to be transported in a reduced weight state, and also facilitating the work of attaching the double-tube rod 1 to the propulsion device 5 while maintaining a predetermined height (such as axial alignment with the propulsion device 5 and connection to an existing rod).

[0021] Similarly, the auxiliary device 10 can also be used in the operation of removing the double-tube rod 1 from the propulsion device 5 after the horizontal hole is formed.

[0022] Therefore, according to the present invention, for example, the physical burden on the worker when attaching and detaching the double tube rod 1 to the propulsion device 5 inside the shaft 4 can be reduced as much as possible. EXAMPLES

[0023] A specific embodiment of the present invention will now be described with reference to the drawings.

[0024] This embodiment is an example of application of the present invention to the case where 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 propelling device 5, thereby forming a horizontal borehole (horizontal hole 3) in the natural ground 2 for draining groundwater.

[0025] Specifically, as shown in FIG. 1, this embodiment includes a shaft forming step of forming a vertical shaft 4 in the natural ground 2 (FIG. 1(a)), an equipment installation step of installing a propulsion device 5 for propelling the double-tube rod 1 within the vertical shaft 4 and installing an auxiliary device 10 for assisting in the transportation of the double-tube rod 1, an installation step of 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 step of propelling the double-tube rod 1 attached to the propulsion device 5 to excavate and form the horizontal holes 3 from the inner wall of the vertical shaft 4 (FIG. 1(c)), thereby forming a predetermined number of horizontal holes 3 from the vertical shaft 4 (FIG. 1(d)).

[0026] The propulsion device 5 and the auxiliary device 10 will now be described.

[0027] An existing drilling machine can be used as the propulsion device 5. That is, a machine that attaches a double-tube rod 1 with a drilling blade 6 (drill bit) at the tip and propels it a predetermined distance, and then propels a new double-tube rod 1 (without a drill bit) additionally connected to the rear of the already-propelled rod, and propels it a predetermined distance, repeatedly, until a predetermined excavation length is reached, can be used.

[0028] For example, a known rotary percussion drill type drilling machine can be used, which applies a driving force to the attached double tube rod 1 as well as a rotational force and an impact force.

[0029] In this embodiment, as shown in Figure 4 etc., a drilling section 7, a support section 8 that supports the drilling section 7 at a predetermined angle, and an operating section (not shown) that operates the drilling section 7 and the support section 8 are used. The support section 8 is provided with a post fixing section 9, which will be described later.

[0030] The hole-drilling section 7 is composed of a slide base 7a and a rod holding section 7b that is provided on the slide base 7a so as to be slidable in the front-rear direction and that holds the double-tube rod 1.

[0031] 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 has a function of moving the double-tube rod 1 in the forward and backward directions while holding it, a function of rotating the double-tube rod 1 about its axis, and a function of striking the double-tube rod 1.

[0032] 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 in a state parallel to the slide base 7a for excavation. The double-tube rod 1 is used by sequentially connecting additional double-tube rods 1 to the rear, and the tip of the outer tube (outer casing) and inner tube (inner rod) of the most advanced double-tube rod 1 is provided with excavation blades 6 (subsequent double-tube rods 1 are not provided with excavation blades).

[0033] In this embodiment, the rotary percussion drill type propulsion device 5 is used, but the present invention is not limited to this and other types of propulsion devices 5 may be used.

[0034] As shown in Figures 2 and 3, the auxiliary device 10 includes a support member 11, a swivel arm member 12 that is attached to the support member 11 so as to be freely rotatable horizontally and protrudes in a direction intersecting the support member 11, a hanging bias member 13 supported by the swivel arm member 12, and a rod holding member 14 that is capable of holding the double-tube rod 1 and is pulled upwardly by the hanging bias member 13.

[0035] 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. In addition, a mounting leg is provided at the lower end of the support member 11, which is detachably attached to the support fixing part 9. The mounting 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 into the insertion hole 20 and the insertion hole provided in the support fixing part 9, and 42 denotes a reinforcing member.

[0036] Therefore, the auxiliary device 10 of this embodiment can be used by being fixed to the propulsion device 5. For example, the pillar fixing part 9 is a part of the support part 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 position of this pillar fixing part 9 is preferably such that the pillar member 11 (rotation axis r) is disposed in the vicinity of the rod holding part 7b of the propulsion device 5. In this case, it is also preferable that the forward / rearward movement direction of the rod holding part 7b and the temporary placement direction of the double tube rod 1 are mutually perpendicular (see FIG. 5, etc.).

[0037] The rotating arm member 12 is composed of a base 22 fixed to the upper end of the support member 11, and a frame-shaped rotating part 24 connected to the base 22 via a rotating part 23 so as to be horizontally rotatable, and a rail-like part 25 is provided on the upper part of the rotating part 24. In this embodiment, the rail-like part 25 is composed of a single tube pipe.

[0038] A hanging biasing member 13 is supported on the tip side of the rail-shaped portion 25 so as to be movable in the protruding direction of the rotating arm member 12 (the longitudinal direction of the rail-shaped portion 25).

[0039] The suspension biasing member 13 is a known spring balancer. The spring balancer has a structure including a wire 28 wound around a drum in a case 27 and a spring that biases the wire 28 in the direction of winding it up.

[0040] A first hook portion 29 provided on the upper portion of this spring balancer is hooked and engaged with a hanging rod 31 of a pipe trolley 30 that is movably mounted on the rail-like portion 25 of the rotating arm member 12 (able to run along the single-tube pipe by means of running rollers). Therefore, the hanging biasing member 13 is supported movably in the protruding direction of the rotating arm member 12. Reference numeral 26 in the drawing denotes a stopper.

[0041] A second hook portion 33 is provided at the leading end of the wire 28 of the spring balancer, and the rod holding member 14 is attached to this second hook portion 33 via a swivel 34 (rewind) and a wire rope 35.

[0042] The capacity of the spring balancer (the tensile force of the wire 28) is set appropriately according to the weight of the double-tube rod 1, etc. For example, the capacity is set to be able to offset about 50% to 80% of the weight of the double-tube rod 1. For example, when a 50 kg double-tube rod 1 is used, the capacity is set to about 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).

[0043] The rod holding member 14 has a horizontal rod 36, a ring-shaped wire rope mounting portion 37 provided at both ends of the horizontal rod 36, and a pair of hook-shaped portions 38 having receiving surfaces curved in an arc shape to fit along the outer peripheral surface of the double-tube rod 1.

[0044] Therefore, by inserting a 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 swivel portion 24, pipe trolley 30 and swivel 34, making it possible to transport and attach the double-tube rod 1 while always offsetting its weight with the spring balancer.

[0045] Each process performed using the above-mentioned equipment will be described in detail below. Although the illustration of the worker is omitted in the drawings, the worker manually carries the double-tube rod 1 using the auxiliary device 10 and performs the installation work.

[0046] The shaft formation process is carried out by known means, for example, digging the ground with heavy machinery (such as a shovel or clamshell) and placing a well 39 made of steel or reinforced concrete with a diameter of about 3 to 4 m (Figure 1(a)). The well 39 is provided with an opening 40 for forming a horizontal hole.

[0047] The equipment installation process is performed by using a crane or the like to carry the propulsion device 5 and auxiliary device 10 into the shaft 4. The propulsion device 5 and auxiliary device 10 may be disassembled and 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 placement position. In the drawing, the reference numeral 41 denotes a temporary placement stand.

[0048] The installation step is performed by a worker manually transporting the double-tube rod 1 from a temporary placement position to the propelling device 5 using the auxiliary device 10, and then installing the rod (FIG. 1(b)).

[0049] Specifically, the installation process is a process in which the double-tube rod 1 to be installed on the propulsion device 5 is held by the rod holding member 14 (Figure 5), and then the double-tube rod 1 is grasped and the rod holding member 14 and the double-tube rod 1 are moved to above the propulsion device 5 while rotating the rotating arm member 12 in response, and installed on 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 the holding is released.

[0050] The horizontal hole forming process is a process in which the double-tube rod 1 attached to the propulsion device 5 is propelled (through the opening 40 of the well 39) to perform excavation, and the mounting process and the horizontal hole forming process are repeated to excavate a horizontal hole 3 of a predetermined distance (FIG. 1(c)). The horizontal hole 3 may be horizontal or inclined. For example, it may be inclined at about 3° to 10° (downward toward the collection well) to promote downstream flow, or it may be inclined upward toward the collection well.

[0051] Furthermore, if the double-tube rod 1 to be mounted next is held by the rod holding member 14 during the horizontal hole forming process, the working efficiency is improved.

[0052] Once the horizontal hole 3 of a predetermined distance has been excavated, 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 in a state in which the weight of the double-tube rod 1 is 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 in a state in which the weight is reduced by the auxiliary device 10.

[0053] After the removal process, similarly form horizontal holes 3 in other locations as necessary. When a predetermined number of horizontal holes 3 have been formed, the propulsion device 5, auxiliary device 10, etc. are removed from inside the vertical shaft 4 (FIG. 1(d)).

[0054] After removing the double-pipe rod 1, a polyvinyl chloride pipe or a steel pipe may be appropriately placed in the horizontal hole 3.

[0055] In addition, although 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 the case where a horizontal hole 3 is formed into a natural slope or embankment (on the ground without forming a vertical shaft 4).

[0056] 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 double-tube rod 1 is held in a suspended state with part or all of its weight offset by the hanging biasing member 13. By moving the double-tube rod 1 together with the rod holding member 14 (the rod holding member 14 and the hanging biasing member 13 rotate and move in accordance with the movement of the double-tube rod 1 by the swivel arm member 12), the worker can transport the double-tube rod 1 with the weight reduced. Furthermore, the work of attaching the double-tube rod 1 to the propulsion device 5 while maintaining a predetermined height (such as axial alignment with the propulsion device 5 and connecting to an existing rod) is also made easier.

[0057] Similarly, the auxiliary device 10 can also be used in the operation of removing the double-tube rod 1 from the propulsion device 5 after the horizontal hole is formed.

[0058] Therefore, this embodiment is an unprecedented horizontal hole forming method that can reduce the physical burden on the worker when attaching and detaching the double tube rod 1 to the propulsion device 5 inside the vertical shaft 4. [Explanation of symbols]

[0059] 1 Double tube rod 2. Ground 3 horizontal hole 4 Shaft 5 Propulsion device 9 Post fixing part 10 Auxiliary equipment 11 Support member 12 Swivel arm member 13 Suspension biasing member 14 Rod holding member 38 Hook-shaped part

Claims

1. 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, An apparatus installation process for installing a propulsion device for propelling the double-tube rod at a position near an excavation target and an auxiliary device for assisting in the transportation of the double-tube rod; a mounting step of transporting the double tube rod using the auxiliary device and mounting the double tube rod on the propulsion device; a horizontal hole forming step of drilling and forming the horizontal hole in the natural ground by propelling the double tube rod attached to the propelling device, The horizontal hole forming method is characterized in that the auxiliary device includes a support member, a swivel arm member attached to the support member so as to be freely rotatable horizontally and protruding in a direction intersecting the support member, a hanging bias member supported by the swivel arm member, and a rod holding member capable of holding the double tube rod and biased upwardly by the hanging bias member.

2. The horizontal hole forming method according to claim 1, characterized in that it includes a shaft forming step of forming a vertical shaft in the natural ground, an equipment arrangement step of arranging a propulsion device for propelling the double-tube rod in the vertical shaft and an auxiliary device for assisting in the transportation of the double-tube rod, the attachment step, and a horizontal hole forming step of propelling the double-tube rod attached to the propulsion device to excavate the horizontal hole from the inner wall of the vertical shaft.

3. A method for forming a horizontal hole as described in claim 2, wherein the double-tube rod is used by sequentially connecting additional double-tube rods to the rear, and the mounting process is a process of holding the double-tube rod to be mounted on the propulsion device by the rod holding member, moving the rod holding member and the double-tube rod to above the propulsion device while rotating the rotating arm member in response, connecting them to the rear of the double-tube rod that has already been propelled, and releasing the holding.

4. 4. A method for forming a horizontal hole according to claim 3, wherein said hanging biasing member is supported so as to be movable in the protruding direction of said pivot arm member.

5. 5. The method for forming a horizontal hole according to claim 4, further comprising a removal step of pulling out the double-tube rod from 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.

6. The horizontal hole forming method according to any one of claims 1 to 5, 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 a mounting leg portion that can be freely attached and detached to the support fixing portion, and the auxiliary device is fixedly installed on the propulsion device and used.

7. 6. The method for forming a lateral hole according to claim 1, wherein the hanging biasing member is a spring balancer.

8. The method for forming a horizontal hole according to any one of claims 1 to 5, 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.

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