JP2006045773A - Underground jacking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground jacking device capable of excavating in any direction of the ground, capable of easily boring a hole having a curved part, and capable of simplifying an aboveground side work assisting device, by adjusting the advancing direction in the ground, by partially varying a form of the device and using a jacking mechanism without requiring the direct driving force transmission via a rod from an aboveground part. <P>SOLUTION: A device body 10 for installing a tip bit 20 in a tip part, is formed into a divided structure, and an interval between units for forming the device body 10, can be adjusted in respective actuator positions. An impactor 40 and a gripper part 50 are arranged so that the device body 10 can be expanded-contracted and bent and the device body 10 can be advanced in the ground with every unit. Various works in the ground can be performed by arriving even at a place unable to arrive only by a linear boring advance by advancing boring while bending in the ground, by jacking while changing the advancing direction in the ground. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an underground propulsion apparatus that excavates the ground to reach a predetermined depth in the ground for ground improvement work or soil soil investigation, and in particular, while changing the traveling direction in any direction in the ground. The present invention relates to an underground propulsion device that is capable of digging and that can reach a place that cannot be reached only by going straight.

  In civil engineering work, a boring device is generally used when drilling holes in the ground prior to soil investigation or ground improvement work. Boring devices can be broadly divided into rotary types that excavate by applying rotational force to the bit at the tip via a rod, and impact types that excavate by applying downward impact force to the bit, but in recent years the excavation efficiency has improved. Therefore, a combination type that applies both rotation and impact force (or vibration) to the bit is used. An example of such a conventional boring device is disclosed in Japanese Patent Laid-Open No. 5-31967. This conventional boring device includes a rotation driving device that rotates a rod on the ground and a vibration generating device that vibrates the rod, and the rotation driving device and the vibration generating device are supported so as to be movable back and forth in the excavation direction. It is.

The conventional boring device replaces the impact force applying mechanism of a so-called rotary percussion drill with a vibration generating device. While feeding the rod from the ground to the ground, the rod is rotated by the operation of the rotary drive device, and at the same time, This is a mechanism in which the ground is excavated by a bit that rotates and vibrates with the rod by transmitting the vibration force to the rod by the vibration device to vibrate the rod.
Japanese Patent Laid-Open No. 5-31967

  The conventional boring device is configured as described above, and uses a rod to push and pull the bit into the ground, so it can only drill holes in a straight line such as perpendicular to the ground. There has been a problem that it is almost impossible to bend a hole in the middle or to make a hole in a gentle curve. For this reason, there are large restrictions in various works such as soil surveys using drilled holes, and it has been extremely difficult to perform ground surveys on the lower side of existing buildings from the ground side of adjacent land.

  In addition, the conventional boring device rotates the drill rod from the ground to apply a rotational force to the bit in the ground to perform drilling, so that the ground-side device can provide an appropriate rotational force and is large and complicated. In addition to having the mechanism, the drive device, the rod, and the connecting structure between the rods are also complicated, and there has been a problem that the cost of the device itself and handling becomes large.

  Furthermore, in the case of a conventional rotary percussion drill or the like, noise is generated at the same time as the impact because an impact force transmitted to the bit by striking with the ground side device is generated. In the conventional boring device described in the above-mentioned patent document, although not as much as noise generated by impact, noise is generated with vibration, and since such a noise source is on the ground, some noise prevention measures are taken. However, noise generation could not be sufficiently suppressed, and it was difficult to perform drilling work in the vicinity of ordinary houses, and there was a problem that there were many restrictions on the construction environment.

  The present invention has been made to solve the above-mentioned problems, and uses a propulsion mechanism that does not require direct drive force transmission from the ground via a rod, and the device configuration is partially variable, so that the device proceeds in the ground. Providing a ground propulsion device that can adjust the direction, excavate in any direction of the ground, easily drill holes with curved portions, and simplify the work auxiliary device on the ground side The purpose is to do.

  An underground propulsion apparatus according to the present invention includes at least a hollow, substantially cylindrical device body and a ground excavation tip bit disposed at a tip portion of the device body, and the tip bit is a front side in the traveling direction. In the underground propulsion apparatus that is introduced inside and proceeds while drilling through the excavation operation of the tip bit, the apparatus main body has a combination structure of a plurality of substantially cylindrical units arranged in the cylindrical axis direction. The length between both ends can be changed and adjusted within a predetermined size range, and each unit constituting the apparatus main body is connected to two unit ends facing each other, and a plurality of units are arranged. The linear reciprocating motion type actuator that changes the distance between each of the arrangement positions and the one or a plurality of predetermined units of the apparatus main body, and an impact force generated by impact in the unit cylindrical axis direction. A gripper that is arranged to be able to expand and contract outside a predetermined unit or a plurality of units of the apparatus main body, presses a hole wall that has been drilled, and can hold the underground position of the unit; A cover made of a flexible body is provided between the units and covers the space between the units in a watertight manner so that they can expand and contract and bend.

  As described above, in the present invention, the device main body having the tip bit disposed at the tip portion has a divided structure, the interval between the units constituting the device main body can be adjusted at each actuator position, and the device main body can be expanded and contracted and bent. At the same time, the impactor and gripper part that allows the device main body to travel in the ground are arranged for each unit, and the propulsion can be carried out while changing the traveling direction in the ground. Various work in the ground can be performed by reaching a point that cannot be reached only by straight excavation. In addition, drilling work in the ground can proceed without receiving drive force from the rod, etc. from the ground, eliminating the need for a drive force transmission mechanism that strongly rotates and pushes the rod, etc., on the ground side device, generating noise. In addition to simplifying and downsizing the structure of the ground side device, drilling into the ground can be carried out from places where sufficient space cannot be secured on the ground side, and work such as ground investigation and ground improvement can be carried out , There are less restrictions on the construction site In addition, work such as connecting rods becomes unnecessary, handling of the ground side equipment becomes easier, the efficiency of drilling work is significantly improved, and the cost of the ground side equipment itself is reduced. You can go down.

  Further, the underground propulsion device according to the present invention can supply a predetermined drilling fluid supplied via a flexible pipe connecting the ground side supply device and the rear portion of the device main body and a flow passage inside the device main body as necessary. One or a plurality of injection holes for injecting at a predetermined pressure from the front end portion of the apparatus main body and / or the front end bit, and in addition to the excavation operation of the front end bit, drilling with the drilling fluid injected into the ground from the injection hole However, it progresses.

  In this way, in the present invention, the tip bit is operated, and by drilling the hole drilling fluid from the tip end of the apparatus body, the hole can be drilled more reliably than in the case of only the bit, Work efficiency can be further improved.

  Further, the underground propulsion device according to the present invention is formed of a flexible tube having substantially the same diameter as the device main body as necessary, and is drilled while being connected to the rear portion of the device main body and following the device main body. A casing that travels in the formed hole.

  As described above, in the present invention, a flexible casing is provided from the rear of the apparatus main body to the ground, and hoses and cables connecting the apparatus main body and auxiliary equipment on the ground are covered with the casing, while holes formed by drilling are provided. By proceeding with excavation while the casing is in contact with the wall, it is possible to maintain the shape of the hole by preventing collapse of the hole wall after drilling while protecting the pipes and cables, etc. Can be done.

  Moreover, the underground propulsion apparatus according to the present invention includes a ground improvement agent supplied via a flexible pipe connecting the ground-side supply device and the rear part of the apparatus main body and a flow path inside the apparatus main body, if necessary. One or a plurality of injection holes that can be injected at least from the front end of the apparatus body in the lateral direction with respect to the traveling direction are provided, and at least when the entire apparatus is moved backward to the ground side, a solidifying agent is injected into the ground from the injection holes. The excavated sediment and the solidifying agent are agitated to improve the ground within a predetermined range around the drilling location.

  As described above, in the present invention, the solidifying agent for ground improvement is supplied from the ground during or after drilling, and sprayed, and the earth and sand in the ground is scraped off with the bit and / or jet fluid. By injecting into the gap, the solidifying agent spreads smoothly over the entire excavation area, and mixing of the excavated earth and solidifying agent is promoted to sufficiently mix the earth and sand and the ground can be improved properly. A curved columnar improvement portion can be formed together with the drilled holes, and the time required for ground improvement work can be shortened by efficiently advancing mixing of earth and sand and a solidifying agent.

  Hereinafter, an underground propulsion apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. In the present embodiment, an example of an apparatus that drills a series of holes curved in the middle of the ground and implements ground improvement on the ground around the drilled portion will be described. FIG. 1 is a side view of an underground propulsion apparatus according to the present embodiment, FIG. 2 is an explanatory view of a bent state of the underground propulsion apparatus according to the present embodiment, and FIG. 3 is an illustration of the underground propulsion apparatus according to the present embodiment. FIG. 4 is a rear end unit downward propulsion state explanatory view when the gripper portion is used together in the underground propulsion apparatus according to the present embodiment.

  As shown in the respective drawings, the underground propulsion device 1 according to the present embodiment is a hollow substantially cylindrical device body 10 having a combined structure of a plurality of substantially cylindrical units, and rotates at the tip of the device body 10. The tip bit 20 for excavating the ground, the hydraulic cylinder 30 as the actuator disposed between the units constituting the apparatus main body 10 to change the interval between the units, and the apparatus main body 10 Each of the impactor 40 that is disposed and generates an impact force for movement and drilling, the gripper portion 50 made of a flexible material that can be expanded and contracted at a predetermined position outside the apparatus main body 10, and each of the apparatus main body 10. The structure includes a flexible cover 60 that covers the units so that the units can be stretched and bent while maintaining a watertight state, and a flexible tubular casing 70 that is connected to the rear portion of the apparatus main body 10.

  The apparatus main body 10 has a structure in which three of a front end unit 11, an intermediate unit 12, and a rear end unit 13 of a substantially metal cylinder are combined and arranged in the cylindrical axis direction. A cover 60 is disposed and is watertightly connected, and a pulling wire 14 is connected to the end of the rear end unit 13 which is the rearmost part, and a pulling device (not shown) is fixed to the ground via the wire 14. ) Can be pulled up from the ground. Further, the connecting portions of the front end unit 11 and the intermediate unit 12 and the rear end unit 13 that are inside the cover 60 have predetermined ends on the front end unit 11 and the intermediate unit 12, or the intermediate unit 12 and the rear end unit 13, respectively. A plurality of hydraulic cylinders 30 mounted so as to be capable of swinging in an angular range are disposed, and the distance between the units of the front end unit 11, the intermediate unit 12, and the rear end unit 13 can be changed by expansion and contraction of each hydraulic cylinder 30. At the same time, by making the extension amounts of the plurality of hydraulic cylinders in the same connecting portion different from each other, one unit can be tilted with respect to the other unit within a predetermined angle range, and the apparatus main body 10 can expand and contract as a whole. It is possible and bendable.

  The distal end portion of the distal end unit 11 can be rotated integrally with the distal end bit 20 by a built-in hydraulic rotation drive unit, and a solidifying agent for improving the ground, water, and air are respectively placed on the side surfaces thereof. A plurality of injection holes 15 capable of spraying in the direction and a mud discharge port 16 for discharging excavated sediment are provided. In addition to this, the tip unit 11 may be provided with a camera, various sensors, a hole for sampling, a small manipulator for underground work, and the like.

  On the other hand, the intermediate unit 12 and the rear end unit 13 incorporate an impactor 40 for generating an impact force for movement and drilling inside, and an expandable / contractible gripper portion 50 is disposed on the outside thereof. The A plurality of stabilizers 18 are disposed on the outer surfaces of the intermediate unit 12 and the rear end unit 13 so as to protrude outward. The stabilizer 18 is a known component that appropriately guides and stabilizes the traveling direction of the tip bit 20 during drilling, and a detailed description thereof is omitted.

  Furthermore, in addition to the hydraulic circuit, water and air, as well as a drilling fluid and a solidifying agent internal flow path are disposed inside the apparatus main body 10, and a plurality of flexible tubes connected to the rearmost part of the apparatus main body 10. Each fluid is supplied from each ground-side supply device through 80. In addition, a control unit 19 that acquires the position of the apparatus and controls the movement direction based on the position is also incorporated in the apparatus main body 10.

  The tip bit 20 has a plurality of injection holes (illustrated) for injecting a hard tooth portion that cuts the ground on the end surface, and a drilling fluid having a predetermined pressure supplied through the flexible tube 80 and the internal flow path of the apparatus main body 10. Is omitted), and detailed description thereof is omitted. The tip bit 20 is configured to be rotatable by a rotation drive unit 17 built in the tip unit 11 of the apparatus body 10. The drilling fluid ejected from the ejection hole of the tip bit 20 may be a mixture of water and an abrasive in addition to high-pressure water. The tip bit 20 can be replaced, and is replaced with one having an appropriate shape according to the soil to be excavated.

  The hydraulic cylinder 30 is a well-known device whose length between both ends can be changed and adjusted within a predetermined size range by hydraulic pressure supplied from the ground side through a predetermined flexible tube 80, and detailed description thereof is omitted. . A plurality of hydraulic cylinders 30 are connected to the two unit ends facing each other between the units 11, 12, and 13 constituting the apparatus body 10, and the intervals between the units are arranged at the respective positions. It is a mechanism to change with.

  The impactor 40 is disposed in the intermediate unit 12 and the rear end unit 13 of the apparatus main body 10 and reciprocates by hydraulic pressure or air pressure to perform impact, and generates impact force (vibration) in the unit cylindrical axis direction. This is a well-known hammer mechanism that promotes in-hole propulsion of the unit and excavation by the tip bit 20, and detailed description thereof is omitted.

  The gripper section 50 is disposed on the outer periphery of the intermediate unit 12 and the rear end unit 13 of the apparatus main body 10, and expands or contracts a flexible liner that can be expanded and contracted by air injection or the like as necessary to closely contact the hole wall. The unit and the ground are integrated, and the underground position of the unit is held to receive the propulsion reaction force of the apparatus main body 10.

  The cover 60 is a flexible body that is disposed between the units 11, 12, and 13 of the apparatus body 10 and covers the gaps between the units so as to be stretchable and bendable while maintaining a watertight state. The parts such as the hydraulic cylinder are protected by preventing the intrusion.

  The casing 70 is formed of a flexible tube having substantially the same diameter as the apparatus main body 10, and is connected to the rear portion of the apparatus main body 10 so as to cover the wire 14 and the flexible tube 80. The wire 14 and the flexible tube 80 are moved up and down in the drilled hole following the movement of the apparatus body 10 while protecting the wire 14 and the flexible tube 80 from contact with the earth and pressure.

  In addition, as the main construction equipment used in conjunction with the underground propulsion device according to the present embodiment, in addition to a pulling device that winds up the wire and pulls up the entire device, a flow in which water and a cemented material such as cement are mixed A mixer (not shown) that forms a solid ground-injecting solidifying agent, a pump (not shown) that pumps the solidifying agent to the underground propulsion device 1, and the like are also used.

  Next, the underground propulsion and the ground improvement operation by the underground propulsion device based on the above configuration will be described. In advance, after installing a lifting device (not shown) for lifting the underground propulsion device 1 on the ground side at a predetermined position with respect to the ground 90 where the ground improvement is planned, the underground propulsion device 1 itself is installed. The tip bit 20 is held upright at the drilling start position in the initial traveling direction, the tip bit 20 is rotated, and the impactor 40 is operated to start excavation of the ground 90 and progress downward. As the underground propulsion device 1 is propelled, the casing 70 and the wires 14 and the flexible tubes 80 inside the casing 70 are also supplied from the ground side and enter and advance into the ground.

  Along with the rotation of the bit 20, the position of the injection hole arranged on the end face of the bit 20 is also rotating. From this injection hole, high-pressure water supplied from a ground pump (not shown) is injected into the ground, The surrounding ground 90 is crushed by the injection pressure, including those in a lump. Simultaneously with the driving of the bit 20, the impactor 40 in each unit of the apparatus main body 10 is operated, and each impactor 40 generates an impact force and vibration accompanying the impact. Thereby, the impact force is transmitted to the bit 20 and the drilling ability is increased, and the ground resistance can be advanced more smoothly by reducing the frictional resistance between the outer peripheral surface of the apparatus main body 10 and the ground 90.

  At the time of excavation, a reaction force for rotating the rear apparatus main body 10 in the reverse direction is generated with the rotation of the bit 20, but the apparatus main body 10 is rotated by receiving the resistance of the ground 90 outside the excavation range. In this state, the excavation ability of the bit 20 can be secured, and the underground soil can be crushed and drilled.

  The earth and sand scraped off by the tip bit 20 and the like enters the inside from the mud outlet 16 provided in the tip unit 11 by the pressure of the air sprayed simultaneously with the hole drilling fluid, and the earth and sand discharge passage in the apparatus main body 10. It passes through the exhaust pipe (not shown) in the casing 50, is conveyed upward by the exhaust pipe together with air, and is collected and discharged on the ground.

  Under such circumstances, the underground propulsion device 1 is in a state controlled by the control unit 19 so as to travel along the preset plan line P. When changing the traveling direction from the straight traveling state, the device main body 10 is The hydraulic cylinders 30 at the connecting portions of the leading end unit 11, the intermediate unit 12, and the trailing end unit 13 are appropriately operated, and the units 11, 12, 13 are inclined with respect to each other by the expansion and contraction, and proceed according to the planned line P. The direction will be adjusted.

  That is, when the apparatus main body 10 reaches the curved portion of the planned line P, the hydraulic cylinder 30 corresponding to the outer peripheral side of the planned line curved portion among the plurality of hydraulic cylinders 30 between the foremost tip unit 11 and the intermediate unit 12 immediately thereafter. Is adjusted to be longer than the hydraulic cylinder 30 on the inner peripheral side, the tip unit 11 is inclined with respect to the subsequent intermediate unit 12, and the apparatus main body 10 is bent. When the underground propulsion device 1 is propelled in this state, the tip unit 11 is propelled by bending along the planned line P. Even when the rear portion of the apparatus main body 10 reaches the curved portion of the planned line P, the extension amounts of the plurality of hydraulic cylinders 30 arranged between the intermediate unit 12 and the rear end unit 13 are adjusted in the same manner as described above, and the apparatus main body 10 The whole apparatus can be propelled along the plan line P by changing the traveling direction to a state along the plan line P.

  Depending on the situation of the ground 90, the entire apparatus may not be lowered even if drilling work is performed by the bit 20 or drilling fluid jet only by the downward driving force based on the weight of the apparatus. In such a case, in a state where the hydraulic cylinder 30 between the intermediate unit 12 and the rear end unit 13 is contracted, the gripper portion 50 of the rear end unit 13 is expanded and brought into close contact with the hole wall so that the rear end unit 13 is placed on the ground. On the other hand, it is possible to obtain the propulsive force of the tip unit 11 and the intermediate unit 12 by extending the hydraulic cylinder 30 (see FIG. 3B) after the state where it does not move integrally (see FIG. 3A). When the drilling proceeds by the injection of the bit 20 or the drilling fluid and the tip unit 11 and the intermediate unit 12 advance to the maximum extension amount of the hydraulic cylinder 30, the gripper portion 50 of the intermediate unit 12 is expanded and brought into close contact with the hole wall. After the intermediate unit 12 is brought into a state where it does not move with respect to the ground, the gripper portion 50 of the rear end unit 13 is contracted so that the portion after the rear end unit 13 can be moved (see FIG. 4A). The hydraulic cylinder 30 between the unit 12 and the rear end unit 13 is contracted, and the rear end unit 13 and the subsequent parts are drawn toward the intermediate unit 12 (see FIG. 4B). Thereafter, the gripper portion 50 of the intermediate unit 12 is contracted so that the portion on the front side of the intermediate unit 12 can be moved downward, and the gripper portion 50 of the rear end unit 13 is expanded to be in close contact with the hole wall. If the same process is repeated in a state where the end unit 13 is not moved (see FIG. 3A), the entire apparatus can be pushed downward.

  When the bit 20 at the tip of the underground propulsion device 1 reaches a preset depth, the excavation of the ground 90 is finished, and as a lifting process, the wire 14 is pulled up together with the surrounding flexible tube 80 and the casing 70 by the lifting device. Then, the injection of the solidifying agent for ground improvement is started from the injection hole 15 in the tip unit 11 of the apparatus main body 10. While the underground propulsion apparatus 1 is lifted by the pulling up, the solidifying agent enters between the ground soil and sand scraped by the bit 20, and the sediment and the solidifying agent within a predetermined range are stirred by the injection pressure and mixed uniformly. . When the bit 20 rises to a predetermined position near the ground, the solidifying agent injection is stopped, and then all the underground propulsion devices 1 are detached from the ground to complete the pulling up. If the earth and sand mixed with the improvement work range of the ground 90 for a certain period of time are solidified, the columnar improvement portion is completed in the ground.

  As described above, in the underground propulsion apparatus according to the present embodiment, the apparatus main body 10 provided with the tip bit 20 at the distal end portion is divided into a plurality of divided structures, and the intervals between the units 11, 12, and 13 constituting the apparatus main body 10 are set to the respective hydraulic pressures. Adjustable by the cylinder 30, the apparatus main body 10 can be expanded and contracted and bent, and an impactor 40 and a gripper portion 50 that allow the apparatus main body 10 to travel in the ground for each unit are disposed, and the traveling direction in the ground By making the propulsion possible while changing the distance, it is possible to perform various operations in the ground by digging while turning in the ground and reaching a place that cannot be reached only by a straight digging. In addition, drilling work in the ground can proceed without receiving drive force from the rod, etc. from the ground, eliminating the need for a drive force transmission mechanism that strongly rotates and pushes the rod, etc., on the ground side device, generating noise. In addition to simplifying and downsizing the structure of the ground side device, drilling into the ground can be performed even from places where sufficient space cannot be secured on the ground side, and work such as soil investigation and ground improvement can be performed , There are less restrictions on the construction site

  In the underground propulsion apparatus according to the above-described embodiment, the ground improvement agent is injected from the tip unit 11 of the apparatus main body 10 to perform ground improvement within a predetermined range around the excavation part of the ground. However, the present invention is not limited to this, and for soil investigation, only the drilling is performed without performing injection other than the drilling fluid. After drilling to a predetermined depth, the soil sample is collected by the predetermined sampling means of the tip unit 11. As in the case of the ground improvement, it is possible to carry out a desired work by advancing a drilling hole to a desired location regardless of the state of the ground, which is difficult with the conventional soil investigation method. Therefore, it is possible to realize sampling, survey, etc. under the existing building at low cost.

  Moreover, in the underground propulsion apparatus according to the above-described embodiment, the apparatus after the drilling is configured to be pulled up from the ground to the ground by pulling up the wire 14 connected to the rearmost part of the apparatus with the pulling device on the ground. However, the present invention is not limited to this, and a method for propelling the entire apparatus little by little by repeating the process of partially proceeding for each unit using the gripper unit 50 and the hydraulic cylinder 30 in the same manner as in the above embodiment is provided above the apparatus. It can also be configured to raise the entire device by applying it to the movement of the machine, eliminating the need for a lifting device on the ground side, eliminating restrictions on the device fixing space on the ground side, Can perform work.

  Further, in the underground propulsion device according to the above-described embodiment, when the propulsive force generated by the expansion and contraction of the hydraulic cylinder 30 is used, the gripper portion 50 of the intermediate unit 12 or the rear end unit 13 as the fixed side is expanded outward. A structure that strongly adheres to the hole wall and obtains a supporting force that does not move integrally with the ground 90 even if the unit receives a reaction force that is generated in the direction opposite to the propulsion direction, so that other units on the propulsion side can be propelled. However, in addition to this, assuming a ground state in which the supporting unit for the propulsion reaction force cannot be sufficiently obtained even if the gripper portion 50 is expanded, and the stationary unit cannot be kept stationary, as shown in FIG. In addition, substantially plate-like auxiliary grippers 51 are provided at a plurality of locations on the outer surface of each unit so as to be able to protrude and accommodate, and the auxiliary grippers 51 are adapted to correspond to the period of expansion of the gripper portion 50 in the underground propulsion process in the above embodiment. The auxiliary gripper 51 can be made to protrude into the hole wall to obtain a stronger support force, and the propulsion reaction force can be received and the fixed unit can be kept stationary. The propulsion by the hydraulic cylinder 30 can be reliably performed.

It is a side view of the underground propulsion apparatus which concerns on one embodiment of this invention. It is bending state explanatory drawing of the underground propulsion apparatus which concerns on one embodiment of this invention. It is intermediate unit downward propulsion state explanatory drawing at the time of gripper part combined use in the underground propulsion apparatus concerning one embodiment of the present invention. It is rear-end unit downward propulsion state explanatory drawing at the time of gripper part combined use in the underground propulsion apparatus which concerns on one embodiment of this invention. It is an auxiliary gripper protrusion state side view of an underground propulsion device concerning other embodiments of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground propulsion apparatus 10 Apparatus main body 11 Front end unit 12 Intermediate unit 13 Rear end unit 14 Wire 15 Injection hole 16 Mud outlet 17 Rotation drive part 18 Stabilizer 19 Control part 20 End bit 30 Hydraulic cylinder 40 Impactor 50 Gripper part 51 Auxiliary gripper 60 Cover 70 Casing 80 Flexible tube 90 Ground

Claims (4)

At least a hollow substantially cylindrical device body and a ground excavation tip bit disposed at the tip of the device body, the tip bit being introduced into the ground with the front side in the traveling direction, and the ground as a tip bit In the underground propulsion device that advances while drilling in the excavation operation of
The device body is a combined structure of a plurality of substantially cylindrical units arranged in the cylindrical axis direction,
The length between both ends can be changed and adjusted within a predetermined size range, and a plurality of units are respectively connected to the two unit ends facing each other between the units constituting the apparatus main body. Linear reciprocating motion type actuators that change at each arrangement position,
An impactor disposed in a predetermined unit or a plurality of units of the apparatus body, and generating an impact force associated with impact in a unit cylindrical axis direction;
A gripper portion that is disposed on the outside of the predetermined unit or a plurality of units of the apparatus main body so as to be able to expand and contract, and that can hold the ground position of the unit by pressing the drilled hole wall;
A ground propulsion apparatus, comprising: a cover made of a flexible body that is disposed between the units of the apparatus body and covers the units in a watertight manner so that the units can be expanded and contracted and bent. In the underground propulsion apparatus according to claim 1,
A predetermined drilling fluid supplied via a flexible pipe connecting the ground-side supply device and the rear portion of the apparatus main body and an internal flow path of the apparatus main body is ejected from the front end portion of the apparatus main body and / or the front end bit at a predetermined pressure. Or a plurality of injection holes,
In addition to excavation operation of the tip bit, the underground propulsion device proceeds while drilling the ground with the drilling fluid injected from the injection hole. In the underground propulsion apparatus according to claim 1 or 2,
A ground that is formed of a flexible tube having substantially the same diameter as that of the apparatus main body, is connected to a rear portion of the apparatus main body, and progresses through the drilled hole following the apparatus main body. Medium propulsion device. In the underground propulsion apparatus according to any one of claims 1 to 3,
It is possible to inject at least a lateral direction with respect to the traveling direction from the distal end of the apparatus main body through a flexible tube that connects the ground side supply apparatus and the rear of the apparatus main body and a ground improvement agent supplied through the internal flow path of the apparatus main body. Comprising one or more injection holes,
At least when the entire apparatus is moved back to the ground side, the solidifying agent is injected into the ground from the injection hole to stir the excavated sediment and the solidifying agent, and the ground is improved within a predetermined range around the drilling site. Underground propulsion device.

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