JP2006336318A - Horizontal hole excavating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal hole excavating device capable of changing a boring direction in the middle of excavation to avoid interference with an obstacle. <P>SOLUTION: The horizontal hole excavating device 1 has an excavating drill 2 disposed almost horizontally, and a driving device 3 connected to the root side end of the excavating drill 2. The excavating drill 2 comprises a bar-like rod body 4 and a spring screw 5 provided at the outer periphery of the rod body 4 separately from the rod body 4. The rod body 4 can elastically curve together with the spring screw 5. The driving device 3 has a screw rotating means (a motor 45) transmitting rotation to the spring screw 5 but intercepted in transmitting rotation to the rod body 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a horizontal hole excavating device for forming a piping hole in a substantially horizontal direction in the ground prior to drawing a pipeline for gas, electricity, water, etc. for homes into a residential land.

When a household gas or water supply pipe is branched from the main pipe and pulled into the residential land, for example, a vertical shaft is provided at the position of the main pipe laid along the passage, and a drill is drilled from this vertical shaft toward the residential land side. A horizontal hole is excavated by a drilling device such as an auger. A lead-in pipe is inserted into the horizontal hole and connected to the main pipe. When connecting the lead-in pipe, the lead-in pipe is first coupled to the tip of a drilling drill or the like at the end of the open side hole on the residential land side. At the same time when the excavation drill is returned, the pull-in pipe is pulled from the residential land side to the road side and pulled out into the shaft. The lead-in pipe drawn into the shaft is connected to the main pipe.

In this way, by drilling a horizontal hole from the vertical shaft side of the main pipe, it is possible to perform piping work to the residential land without destroying the asphalt sidewalk or side gutter on the surface between the residential land and the road, shortening the construction period Work can be done efficiently.

A drilling means such as a drilling drill or an auger of a conventional horizontal hole drilling device for drilling such a horizontal hole is one in which a screw for soil removal is integrally formed at the rear part of the blade portion for the drilling means at the tip. It is. The blade part at the tip advances in the ground while rotating integrally with the screw. For example, Patent Document 1 discloses a propulsion device for excavating a horizontal hole provided with an earth removing auger screw.

The apparatus described in Patent Document 1 advances while simultaneously rotating an excavating auger bit at the tip and an auger screw integral therewith. A tube member is provided on the outer periphery of the auger screw, and the tube member is circumscribed. Then, the buried pipe is fitted, and the buried pipe is pushed into the ground together with the pipe member while the auger is advanced.

In this auger screw, a helical screw blade is integrally formed on the outer periphery of a rod-shaped central shaft portion, and the central shaft portion and the screw blade rotate together. An auger bit is fixed to the tip of the central shaft portion. Conventional auger screws are rigid and go straight in a defined direction. In the apparatus of Patent Document 1, a jack is used as a positioning means in the height direction, but once the position is determined, the direction cannot be changed in the middle.

That is, in the conventional horizontal hole excavating apparatus, the screw is a rigid body, the spiral blade and the central shaft portion are integrated, and the whole rotates together with the excavating blade portion at the tip. Moreover, since the conventional screw is a rigid body, it cannot go straight in a certain direction and bend in the middle to change the course.

For this reason, when a conventional horizontal hole drilling device is used, if the tip hits an existing buried pipe while the drilling drill or auger is moving in the ground, the direction cannot be changed, and the buried pipe is destroyed as it is and the buried pipe is destroyed. .

On the other hand, when laying pipelines of gas, oil, water, etc. that are somewhat larger in diameter than household lead-in pipes in the ground, the ground building may be in the way, and the grooves and holes for filling the buried pipes cannot be excavated There is. In such a case, a starting shaft is dug in the vicinity of the planned buried portion below the existing structure such as a building, and a drilling device is arranged in the shaft, and a hole is dug in a substantially horizontal direction from the shaft. The buried pipe is pushed into the horizontal pipe burying hole.

The excavator mainly includes an auger for excavating a front formation, an auger screw for discharging soil excavated by the auger (hereinafter referred to as excavated soil) backward, and a rotating means for rotating the auger screw. It is comprised by. As an alternative to this augerbit, a boring device is known that fluidizes the soil in front by spraying high-pressure water from its tip and discharges the excavated soil that has become muddy into the rear using an auger screw. .

In addition, the excavator is provided with a reaction plate on the enlarged portion / rear wall of the propulsion start end, and the buried pipe is penetrated through the excavator, and the propulsion plate applied to the rear end of the buried pipe is placed behind the reaction plate. There has also been proposed a simple propulsion device that is screwed with a plurality of extending rod-like members and propels the buried pipe into the ground by moving the propulsion plate. (For example, see the above-mentioned Patent Document 1).

By the way, these devices described above, including the auger bit at the tip and the high-pressure water jet nozzle, are formed entirely as a rigid body, and the drilling direction extends linearly from the drilling start hole and does not bend in the middle. For this reason, if the tip of the equipment hits an obstacle that is difficult to excavate (for example, an already buried pipeline, strong rock or stone) during the underground drilling process, the drilling operation will be interrupted. Thus, a new excavation route must be sought again, and in this case, the previous drilling operation is completely wasted. In other words, underground drilling work must be carried out after carefully investigating underground piping conditions and bedrock etc. in the ground to be drilled and drilled, which complicates lifelines and the like Nowadays, the survey itself takes time and effort, and the accuracy of the survey itself is naturally limited.

Japanese Patent Application No. 8-165891

  In view of such a current situation, the present invention provides a horizontal hole excavation device that can easily change the drilling direction even when the tip of the device hits the obstacle, and can avoid interference with the obstacle. For the purpose.

In order to achieve the above object, a first aspect of the present invention is a horizontal hole excavation apparatus comprising an excavation drill disposed substantially horizontally and a drive device coupled to a root side end of the excavation drill. The excavation drill includes a rod-shaped rod main body and a spring screw provided on the outer periphery of the rod main body separately from the rod main body, and the rod main body can be elastically curved together with the spring screw, and the driving device Has a screw rotating means that transmits rotation to the spring screw and is blocked from transmitting rotation to the rod body.

According to a second aspect of the present invention, in the first aspect of the invention, the rod body can be attached to and detached from a leading rod having a water jet nozzle at the tip and a rear end of the leading rod according to the excavation length. Each rod is composed of a pipe member connected via an elastic material along the axial direction, and the leading rod is a cone-shaped member equipped with the water injection nozzle. It has a head, and a wire for changing the head direction is connected to the head.

According to a third aspect of the present invention, in the second aspect of the present invention, the hose connected to the water injection nozzle and the wire are inserted into the rod body.

According to a fourth aspect of the invention, in the third aspect of the invention, each of the rods has a spring screw having a length corresponding to each rod on an outer peripheral portion, and the hose and wire having a length corresponding to each rod inside. The rod body is formed by connecting rods to each other and by connecting a spring screw, a hose, and a wire of each rod.

According to a fifth aspect of the present invention, in the invention according to any one of the second to fourth aspects, each of the tube members of each rod has axial grooves formed on both upper and lower side surfaces on the outer peripheral side, and bridges adjacent tube members. A leaf spring that fits into the groove is mounted, and the leaf spring allows the horizontally arranged rods to bend in the vertical direction and prevents twisting between adjacent tube members. .

The invention of claim 6 is the invention according to any one of claims 2 to 5, wherein the driving device connects a moving table that presses the excavation drill in a horizontal direction and the connecting rod fixed on the moving table. Rod coupling tube, a rotating plate mounted on the outer periphery of the rod coupling tube via a bearing, a connecting screw for coupling the spring screw fixed to the rotating plate, and a wire operation for pulling the wire And a rotation transmission means for connecting the motor and the rotating plate.

Invention of Claim 7 is provided with the high-pressure water pump connected to the said hose in invention in any one of Claims 3-6, The water injected from the said water injection nozzle is collect | recovered in a muddy water pool, and the collected muddy water Is re-supplied to the water injection nozzle from a high-pressure water pump through a plurality of filters.

According to the first aspect of the present invention, the spring body which is separated from the rod body and has elasticity is provided on the outer periphery of the rod body which forms the central shaft portion of the drilling drill, and both the rod body and the spring screw can be elastically bent. Therefore, when hitting an existing buried pipe during excavation, the course can be easily changed along the curved surface of the buried pipe, and the buried pipe is not destroyed. In addition, the rod body, which is the central shaft of the drilling drill, does not rotate, but only the outer spring screw rotates to perform drilling and soil removal. A wire or the like for changing the direction of the part can be disposed, and a compact configuration can be obtained. In addition, power consumption can be reduced.

According to the invention of claim 2, since the rod body constituting the central shaft portion of the drilling drill is composed of the leading rod and a connecting rod of a predetermined length continuous with the leading rod, the connecting rods are successively added during the excavation and a narrow shaft is formed. Long lateral holes can be drilled from the inside. In addition, by jetting high-pressure water from the water jet nozzle provided in the leading rod, the soil can be softened and excavated, and the excavation load resistance is reduced. In addition, since the wire for changing the direction is connected to the head, the head can be swung by pulling the wire to change the path and avoid the existing buried pipe.

According to the invention of claim 3, since the water injection hose and the head direction changing wire are inserted into the non-rotating rod body, a highly reliable function can be obtained with a compact configuration.

According to the invention of claim 4, since the leading rod and the connecting rod each have a spring screw, a hose and a wire having a length corresponding to each rod, when connecting the connecting rod, By connecting the four members of the spring screws, the hoses, and the wires, the connecting rod can be reliably connected and the rod body can be lengthened in sequence.

According to the invention of claim 5, since the plate spring is mounted in the axial groove formed on the upper and lower side surfaces of the pipe member, the rod can be bent in the vertical direction by this plate spring, and the existing buried pipe When hitting, the direction can be changed above or below the buried pipe and over the buried pipe. In addition, since the plate spring prevents the rod from being twisted, the vertical bending direction is reliably maintained.

According to the sixth aspect of the present invention, the rotating plate is mounted on the outer periphery of the rod coupling pipe connected to the last connecting rod of the excavation drill via the bearing, and the spring screw of the connecting rod is coupled to the rotating plate. By fixing the connecting screw and connecting the rotating plate and the motor with, for example, a chain or the like, only the outer connecting screw can be rotationally driven while the rod coupling tube is fixed. Thereby, only the outer peripheral spring screw can be rotated while the rod body of the excavation drill is not rotated. In this state, the excavation drill moves forward while drilling in the ground by pushing the moving table and moving it in the excavation direction. A driving device for the excavation drill can be compactly formed on the moving table by placing the operating device for the wire for changing the direction of the leading rod on the moving table and connecting the high pressure water hose to the high pressure water pump.

According to the invention of claim 7, the water jetted from the water jet nozzle of the head rod returns to the drilling start opening end of the horizontal hole in the muddy state together with the excavated soil, and this mud is collected in the mud pool in the shaft. Is done. This muddy water is supplied again to the water jet nozzle of the leading rod by a high pressure water pump through a plurality of filters and recirculates. As a result, the soil mass is removed from the muddy water, and the soil quality can be softened by efficiently using a limited amount of water and the excavation efficiency can be increased without deteriorating the pump function.

FIG. 1 is a basic configuration diagram of an embodiment of the present invention.
The horizontal hole excavating apparatus 1 includes an excavating drill 2 arranged substantially horizontally and a driving device 3 connected to a root side end of the excavating drill 2. The excavation drill 2 includes a rod-shaped rod body 4 and a spring screw 5 that is attached to the outer periphery of the rod body 4 separately from the surface of the rod body. The rod body 4 includes a leading rod 7 provided with a water jet nozzle 6 at the tip, and a plurality of connecting rods 8 having a fixed length in which the number corresponding to the excavation length is detachably coupled to the rear end of the leading rod 7. Consists of.

Each connecting rod 8 includes four pipe members 10 connected via a plurality of (three in this example) elastic members 9 along the axial direction (see FIG. 3).
The drive device 3 is mounted on the movable table 11 and can be reciprocated in the horizontal direction as indicated by an arrow A. When excavating, the excavating drill 2 is pressed into the ground and drilled. This drive device 3 connects a hose connection means 13 for connecting the high-pressure water pump 12 and the water injection nozzle 6, an operation means 14 for the direction changing wire of the leading rod 7, and the last connecting rod 8. Rod connecting means 15 and screw rotating means 16 for rotating only the spring screw 5 without rotating the rod body 4 are provided.

FIG. 2 is a configuration diagram of the leading rod.
The leading rod 7 includes a cone-shaped head 17 having a water jet nozzle 6 attached to the tip thereof, and a large-diameter pipe member 10a, an intermediate pipe member 10b, and a connecting pipe member 10c connected to the rear thereof via an elastic material 9, respectively. It consists of. The elastic material 9 is formed of a coil spring, and both end portions thereof are fixed by welding to the head 17 and end surfaces of the pipe members 10a, 10b, and 10c, respectively.

A pressure bar 18 for swinging the head up and down is provided on the upper and lower portions of the end surface of the head 17. The rear end portion of the pressing rod 18 is connected to one end of a lever 19 provided in the large diameter pipe member 10a. A wire 20 is connected to the other end of the lever 19. A ring 20 a is formed at the end of the wire 20.

By pulling the wire 20 rearward, the pressing rod 18 presses the upper part or the lower part of the head 17 via the lever 19 and directs the head 17 downward or upward. By appropriately setting a lever ratio corresponding to the position of the shaft 19a of the lever 19, the direction of the head 17 can be changed with a small tensile force. When the tensile force of the wire 20 is released, the head 17 returns to the position facing the center direction by the elastic restoring force of the elastic material 9. A return spring may be separately provided on the lever 19.
As shown in the figure, the two pressing rods 18 are arranged to cross each other. With such a cross arrangement, the pressing rod 18 does not interfere with the inner surface of the pipe member when the direction is changed by the head 17 swinging up and down, and the direction changing operation can be performed without any problem.

A hose 21 for supplying high-pressure water is connected to the water injection nozzle 6. A coupling coupler 21 a is provided at the rear end of the hose 21.
A spring screw 5 is mounted on the outer periphery of the leading rod 7. The wire 20 and the hose 21 are disposed through the inside of the leading rod 7.

The diameter of the spring screw 5 is enlarged at the portion of the large-diameter pipe member 10a. In this way, by forming the spring screw 5 at the head portion with an enlarged diameter, when the connecting rod 8 (see FIG. 3) is sequentially added to the rear portion and propelled in the ground, the excavation load resistance is almost at the leading diameter. The excavation load resistance of the spring screw 5 of the connecting rod which is carried by the spring screw 5 of the part and is sequentially connected to the rear part is reduced. Thus, even when the excavation length is extended, the excavation work can be stably performed with a substantially constant small power without increasing the rotational power.

FIG. 3 is a configuration diagram of the connecting rod.
The connecting rod 8 includes a connecting pipe member 10c and two intermediate pipe members 10b at both ends, and the elastic material 9 is fixed by welding between the pipe members 10b and 10b and between the pipe members 10b and 10c in the same manner as the head rod 7 described above. Is done. A spring screw 5 is mounted on the outer periphery of the connecting rod 8, and two wires 20 and one hose 21 are inserted through the inside. The outer shape of the connecting rod 8 and the diameter of the spring screw 5 on the outer periphery thereof are the same as the tube member 10c at the rear end of the leading rod 7 (FIG. 2) and the spring screw on the outer periphery thereof.

A coupler 21 a is provided at one end of the hose 21. The other end of the hose 21 is in a cut-off state. By inserting the end of the cut hose 21 into the coupler on the other side, the hoses are connected.
When connecting the connecting rod 8 to the leading rod 7 and connecting the connecting rods 8 to each other, the two wires 20, the hose 21, the connecting pipe member 10c, and the spring screw 5 are connected to each other. The connecting rods 8 are sequentially added (see FIG. 5).

4A and 4B are top views of the connecting rod.
As shown to (A), the groove | channel 22 of an axial direction is formed in the upper and lower both surfaces (a figure shows only an upper surface only) of each pipe member 10b, 10c of the connection rod 8, and the position is aligned. A leaf spring 23 is fitted into the groove 22 across the adjacent tube members 10c, 10b and between the tube members 10b, 10b. Both end portions of the leaf spring 23 are slidably held with respect to the pipe members 10b and 10c via bolts 24, respectively.

By mounting such a leaf spring 23, the connecting rod 8 can be bent by the action of the elastic member 9 only in the vertical direction. Further, the twisting of the tube members 10b and 10c is prevented, and the vertical direction of the tube members is always kept constant. Such a leaf spring 23 is also provided on the leading rod 7.
(B) shows another mounting structure of the leaf spring 23. In this example, an arc groove 110 along a part of the circumference is formed on the upper surface of the end of the tube member 10b. An arc-shaped cover material 111 is attached to the arc groove 110 and fixed to the bottom surface of the arc groove 110 by welding. A leaf spring 23 is inserted into the gap between the cover material 111 and the bottom surface of the groove 22 in the axial direction so as to be bridged between both pipe members 10b. Thereafter, a screw 112 is screwed onto the bottom surface of the groove 22 at a position slightly spaced from both ends of the leaf spring 23. The screw 112 serves as a stopper for preventing the leaf spring 23 from coming off.

FIG. 5 shows a connecting structure between rods.
(A) shows the connection structure of the wire 20. Rings 20 a are formed at both ends of the wire 20. The wheels 20a are connected by a coiled connection ring 25.
(B) shows the connection structure of the hose 21. By inserting the end of the other hose 21 ′ into the coupler 21 a provided at one end of the hose 21, both the hoses 21 and 21 ′ are connected.

(C) shows the connecting structure of the connecting pipe members 10c, 10c. One tube member 10c has a male tube 26, and a female tube 28 is formed on the opposite tube member 10c. After inserting the male cylinder 26 into the female cylinder 28, the pipe members 10c are fixed to each other by a single bolt (not shown) through the screw hole 30 in a state of being aligned in the circumferential direction.
(D) shows the connection structure between spring screws. Two to three turns at the ends of the spring screws 5 and 5 to be connected are overlapped with each other, and a rivet bolt 33 is pushed in through a coil spring 32 through a hole 31 formed in advance. When the end portion of the rivet bolt 33 protrudes to the opposite side, the clip pin 34 is inserted into a hole (not shown) provided at the end portion, and the spring screws 5 and 5 are fixed. Such rivet bolts 33 are provided at, for example, three places.

By connecting the four members as described above (A) to (D), the connecting rod 8 is sequentially added. The connecting member is not limited to the illustrated example, and may be connected by another appropriate method.

FIG. 6 is a configuration diagram of the driving device.
The drive device is connected to the last connecting rod 8 and the spring screw 5 of the excavation drill 2 (see FIG. 1). The connection structure of the wire 20, the hose 21, the pipe member 10c, and the spring screw 5 of the connection rod 8 is the same as the connection structure shown in FIGS.

The driving device 3 is mounted on the movable table 11. The moving table 11 reciprocates horizontally as indicated by an arrow A on the guide rail 35. For example, a rack gear may be formed on the guide rail 35, and a pinion gear meshing with the rack gear may be provided on the moving table 11 so that the moving table 11 can reciprocate.

A support frame 36 is fixed on the movable table 11, and a rod coupling tube 37 is fixed to the support frame 36 by bolts 38. The rod coupling tube 37 has a structure similar to that of the connecting tube member 10c described above, and has a longer axial length. The tube member 10c of the rearmost connecting rod 8 is connected and fixed to the rod connecting tube 37.
The two wires 20 inserted through the connecting rod 8 are connected to a wire operating tool 39 having an operating lever 39a through the connecting structure of FIG. By operating the operation lever 39a, one of the two wires 20 is pulled to change the vertical direction of the head 17 of the leading rod 7 (FIG. 2).

A hose 40 connected to the high-pressure water pump 12 is connected to a coupler 21 a provided at the end of the hose 21 of the connecting rod 8.
A rotating plate 42 is attached to the outer periphery of the rod coupling tube 37 via a bearing 41. A coupling screw 43 is fixed to the rotating plate 42. The rear end portion of the spring screw 5 is coupled to the coupling screw 43 via the coupling structure of FIG.

A motor 45 is installed on the movable table 11. A drive sprocket 44 is connected to the output shaft of the motor 45. A driven sprocket 45 is provided on the outer periphery of the rotating plate 42. The drive sprocket 44 and the driven sprocket 45 are connected via a rotational drive transmission means 47 such as a chain. In the figure, the sprockets 44 and 45 are drawn with their positions shifted, but in actuality, they are arranged at the same position and the chain is bridged.

When the motor 45 rotates, the rotating plate 42 rotates through sprockets 44 and 45 connected by a chain. This rotational force is blocked by the bearing 41 with respect to the rod coupling tube 37, and the rod coupling tube 37 does not receive the rotational force. Thereby, only the spring screw 5 connected to the rotating plate 42 rotates, and the connecting rod 8 does not rotate.

Hereinafter, with reference to drawings, the embodiment of the horizontal hole excavation device concerning the present invention is further described. FIG. 7 is an explanatory view of an embodiment in which the horizontal hole excavating device of the present invention is arranged at a construction site to be drilled.

  The residential pit HP and the road side pit RP are excavated in the vertical direction across the sidewalk S. On the sidewalk S, for example, a U-shaped side groove UG and a shoulder L-shaped side groove LG are provided exposed on the ground surface. In the horizontal hole excavating device 51 according to the present invention, the driving device 52 is disposed on the bottom PB of the road side pit RP, and the pit bottom PB further temporarily stores muddy water discharged from a drilled hole (described later). A muddy water reservoir 53 is provided. A is a roadway. The driving device 52 is arranged in the road side pit PR in order to form a hole extending from the road side pit PR through the sidewalk S to the residential land pit HP.

The driving device 52 is installed on a geared rail 54 (guide rail 35 in FIG. 6) so as to be movable in the horizontal direction, and the geared rail 54 is positioned with respect to the bottom PB of the road side pit RP (for example, a jack or the like). ) 55. The drive device 52 includes a carriage 58 having a geared wheel (pinion) 57 that meshes with the rack gear 56 of the geared rail 54, a motor (rotating means) 59 placed on the carriage 58, and the carriage 58 with a gear. And a handle 61 that is rotated by an operator to move horizontally along the rail 54. The driving device 52 further includes a drilling drill 62 at the tip of the motor 59.

The excavation drill 62 has a pipe-shaped leading rod 63 positioned on the tip side thereof, a pipe-shaped connecting rod 64 connected to the rear end of the leading rod 63, and the rods 63, 64 wound spirally. And a spring screw 65 formed in the above. The rear end of the connecting rod 64 is fixed to the drive device 52. The connecting rod 64 and the spring screw 65 are sequentially added as the drilling work proceeds as described above.

As shown in the figure, the leading rod 63 has a conical cone shape at the tip end, and the spring screw 65 (part) positioned around the leading rod gradually follows the outer diameter of the rod 63 toward the tip end side. Reduce diameter. The leading rod 63 is provided with a high-pressure water injection nozzle 67 at its tip, and high-pressure water is jetted forward from the tip of the nozzle 67.

The high-pressure water is supplied to the nozzle 67 through a hose 69 from a jet injection device 68 installed on the road, for example. The hose 69 is connected to the injection nozzle 67 through the inside of the driving device 52 and further through the inside of the rods 63 and 64.

A small submersible pump 70 is installed in the muddy water reservoir 53 that collects muddy water discharged from the hole being formed in accordance with the drilling operation by the apparatus 51. In order to filter muddy water, the submersible pump 70 is provided with a water intake 71 with a filter. The muddy water filtered by the pump 70 is supplied to a water storage tank 73 installed on the road through a hose 72. A filter 74 is further provided at the tip of the hose 72 (on the water storage tank 73 side). The water thus recovered is further supplied from the water storage tank 73 to the jet injection device 68 via the hose 75 to the jet injection device 68. A filter 76 for filtering muddy water is also provided at the inlet of the water supply hose 75. As described above, the excavation apparatus 1 of the present invention employs a water circulation system in which the high-pressure water ejected from the ejection nozzle 67 is collected and supplied to the jet ejection apparatus 68 and then supplied to the nozzle 67 again. Thereby, the consumption of water accompanying the operation of the excavator 1 can be reduced. The above is the configuration of the excavator 1 according to the present invention. In FIG. 7, reference numeral 77 denotes a rod introduction pipe for smoothly guiding the leading rod 63 into the ground prior to drilling work, and 78 denotes an end flange 77a of the rod introduction pipe 77 fixed to the side wall of the road side pit RP. It is a fixed pin.

A specific structure of the excavation drill 62 will be described below. FIG. 8 is an external view of the leading rod 63 and the connecting rod 64 excluding the spring screw 65 from the drilling drill 62. This figure shows one leading rod 63 and two continuously connected in series therewith. The connecting rod 64 is shown. However, as described above, the connecting rods 64 are connected one after another according to the perforation length, and the number is not limited as a feature of the present invention.

Both the leading rod 63 and the connecting rod 64 are composed of a plurality of tube members 80 and a plurality of elastic members 81 interposed between the tube members 80. Each elastic member 81 is welded to the end surface of the pipe member 80 at both ends in the axial direction. Further, the two adjacent pipe members 80 sandwiching the elastic member 81 are connected via a leaf spring (the leaf spring 23 in FIG. 4). As described above, this leaf spring is used to prevent the elastic member 81 from being twisted and to prevent the rods 63 and 64 from bending in the lateral direction (perpendicular to the drawing). Two connection parts between the members 80 are provided on the upper and lower sides so as to face each other in the pipe member diameter direction.

FIG. 9 is an enlarged view of the mounting portion of the plate spring 82 in the rods 63 and 64, viewed from above. The two tube members 80 sandwiching the elastic material 81 made of a coil spring are formed with grooves 84 for accommodating the leaf springs 82 extending on the outer peripheral surface 83 along the longitudinal direction of the tube member. Further, a screw hole (not shown) for receiving a bolt, which will be described later, is formed in the bottom portion 84a of the groove 84 at an appropriate distance from the end face 85. On the other hand, a long hole 86 for inserting a bolt is formed in the vicinity of both ends of the leaf spring 82. In order to fix the plate spring to the tube member 80, the bolt 87 is screwed into the screw hole of the tube member 80 through the bolt insertion long hole 86 of the plate spring 82. A washer 88 is sandwiched between the head of the bolt 87 and the leaf spring 82. The leaf spring 82 is provided in the groove 84 of the tube member 80 by providing the plate spring 82 with the bolt insertion long hole 86 and fixing the plate spring 82 to the tube member 80 with the washer 88 interposed. Slight sliding is possible in the tube axis direction, so that the connecting portion between the tube members 80 via the elastic member 81 has the elasticity of the elastic member 81 and the leaf spring 82, as shown in FIGS. 10 (a) and 10 (b). As shown, it is possible to bend in the directions of arrows A and B.
The leaf spring holding structure is not limited to the example of FIG. 9, and the leaf spring is covered with the arc-shaped cover material 111 from above the leaf spring 23 as shown in FIG. You may hold | maintain so that sliding is possible.

FIG. 11 is a cross-sectional view illustrating the connecting portion 64 of the connecting rod 64 and the leading rod 63 ahead (or the preceding connecting rod 64). A reduced diameter portion 90 having a diameter smaller than the outer diameter of the tube is formed at the end of the tube member 80a at the tip of the connecting rod 64. When connecting the connecting rod 64 and the leading rod 63, or connecting the connecting rods 64, the reduced diameter portion 90 is used as the inner periphery of the pipe member 80b located at the rearmost end of the leading rod 63 (or the preceding connecting rod 64). The bolt 94 is inserted into a hole 93 formed in the enlarged diameter portion 92 and pressed or screwed onto the outer peripheral surface 95 of the reduced diameter portion 90 of the connecting rod 64. . As a result, both the pipe members 80a and 80b can be aligned in the circumferential direction using one bolt 94 and can be reliably coupled. In FIG. 11, reference numeral 97 denotes a screw hole formed in the reduced diameter portion 90 of the connecting rod 64.

FIG. 12 shows the tip of the spring screw 65. In the present embodiment, the spring screw 65 is divided for each of the rods 63 and 64, and finally these are connected in series. The spring screw 65 includes a leading portion 105 that spirally winds around the leading rod 63, and one or more subsequent connecting portions 106 that spirally wind around the corresponding connecting rod 64. Consists of. The leading portion 105 follows the outer shape of the leading rod 64, gradually increases in diameter toward the rear from the tip, reaches the maximum around the large-diameter tube member 98, and gradually decreases in diameter from here to the periphery of the tube member 80. To do. On the other hand, the subsequent connecting portion 106 spirally extends so as to surround the periphery from the tube member 80a (see FIG. 8) located at the forefront of the connecting rod 64 to the rearmost tube member 80b. It is formed with a substantially constant outer diameter following the diameter. As described above with reference to FIG. 5D, the leading portion 105 and the subsequent connecting portion 106 are fixed by inserting bolts 107 into a plurality of holes (not shown) formed in the circumferential direction in both overlapping portions. Are connected. Although not shown in FIG. 12, the subsequent connecting portions 106 are also connected using bolts (not shown) in the same manner as the above connection. In addition, if it uses the connection structure by insertion of the above-mentioned FIG.5 (D) clip pin, without using a volt | bolt, a connection operation | work can be performed easily in a short time.

As described above, the spring screw 65 is connected to the output side (for example, a rotating disk) of the drive device 52 at the rear end of the connecting portion 106 that is the rearmost part of the spring screw 65. Rotate around 63, 64. The spring screw 65 excavates soil (mud) softened by the high-pressure water from the high-pressure water jet nozzle 67 and conveys the excavated soil to the rear of the rods 63 and 64 by the rotation of the screw itself.

Further, as shown in FIG. 13, the cross section of the spring screw is formed such that the screw axial end surfaces 108a and 108b are flattened and the radial width dimension b is larger than the thickness dimension a in the screw axial direction. This is for the purpose of improving the excavation soil conveying function by the spring screw 65. The spring screw 65 on the outer periphery of the head 99 of the leading rod 63 may be provided with serrated notches on the outer peripheral portion thereof. This increases the excavation power.

A method of using the excavator 51 configured as described above will be described below with reference to FIG.
First, in a state where the driving device 52 is installed on the bottom PB of the road side pit RP, the rod introduction pipe 77 is mounted on the side wall of the road side pit RP to be drilled. An operator (not shown) aligns the tip of the excavation drill 62 of the drive device 52 with the inlet of the rod introduction pipe 77 and operates the handle 61 to advance the carriage 58 toward the side wall of the pit RP. As a result, the tip of the excavation drill 62 is inserted into the rod introduction tube 77 and hits unperforated soil. In this state, the worker starts driving the motor 59 and the jet injection device 68 that are placed on the carriage 58. As a result, high-pressure water is ejected vigorously from the nozzle 77 of the leading rod 63, and the soil in front is softened and excavated by the spring screw 65. The excavated soil is mixed with high-pressure water to be fluidized (mudified). Then, the flowed soil is conveyed to the inlet side from the inside of the rod introduction pipe 77 by the spring screw 65, and finally falls from the inlet of the rod introduction pipe 77 to the muddy water reservoir 53 disposed below. Can be stored. The muddy water stored in the muddy water reservoir 53 is filtered by operating the pump 70 installed in the muddy water reservoir 53, and then, as described above, the muddy water is passed through the hose 72, the water storage tank 73, and the hose 75 to the jet injection device 68. Supplied and reused.

The operator operates the handle 61 again to further move the carriage 58 forward. The injection of high-pressure water from the nozzle 67 is continued, and the spring screw 65 advances while excavating the softened ground. The excavated soil is removed from the excavated hole by the spring screw 65. When the carriage 58 moves forward on the rail 54 and is positioned in the vicinity of the rail front end in this way, the operator here operates the driving device 52 (that is, high-pressure water injection from the nozzle 67 and the spring screw 65). ) Is temporarily suspended, the handle 61 is operated to return the carriage 58 to the original position, and then the excavation drill 62 is once removed from the drive device 52. At this time, the wire W and the hose 69 described above are also temporarily disconnected from the drive device 52 side. Next, a new connecting rod 64 and a corresponding spring screw 65 are prepared and connected to the respective rear ends of the preceding connecting rod 64 and spring screw 65, and a new wire W and hose 69 are also provided. The wires W and the hose 69 are connected, and the rear ends of the added members are connected to the driving device side as described with reference to FIG. As a result, the excavation drill 62 increases in total length by the length of one connected connecting rod 64 and can travel deeper in the ground through the rod introduction pipe 77 accordingly. In the drilling operation, the above-described steps are repeated to gradually increase the overall length of the drilling drill 62 while propelling the tip in the horizontal direction in the ground, and finally form a pipe passage to the destination point. is there. Also, if the tip of the drilling drill hits an existing pipe or obstacle that prevents further straight movement during this drilling process, the wire operating tool 103 is operated to move the head 99 upward or downward. Tilt. Thereby, the tip of the drilling drill 62 can change the propulsion direction while avoiding a collision with an obstacle, and the rods 63 and 64 also have the elastic material 81 between the adjacent pipe members 80. Following the head 99, the traveling direction can be changed. In addition, the excavation drill 62 of the present embodiment can change the propulsion direction of the head 99 up and down by intentionally operating the wire operation tool 103 even if the tip does not hit an obstacle. For example, as shown in FIG. 7, in the state where the tip of the head 99 has reached the vicinity of the residential pit HP, the propulsion direction can be changed upward to open the target residential pit HP.

As described above, according to the present embodiment, the leading rod 63, the subsequent connecting rod 64, and the spring screw 65 around them are formed with flexibility, so that they hit an existing pipe or the like. Sometimes, the propulsion direction of the leading rod 63 can be changed automatically or remotely from the work site side, and the existing pipes that have been obstructed by the straight drilling work so far have been destroyed or the work is interrupted by obstacles, You can avoid problems such as redoing. In addition, since the excavator according to the present embodiment reuses water once used for excavation, it is advantageous in terms of cost and environment. Further, since the pipe member 96 having the maximum diameter is provided at the head rod 63, the subsequent connecting rod 64 can be moved smoothly, and the load of movement of the carriage 58 by the operator and the resistance of the spring screw 65 are light. is there.

  In the illustrated embodiment, the movement of the carriage 58 and the change in the direction of the leading rod 63 are all performed manually, but may be performed by other driving means (for example, a motor or an actuator). Further, in this embodiment, the so-called water circulation type perforation device that filters and sprays the injected high-pressure water is used again. However, as long as there is no environmental problem, the water once used for excavation is discarded as it is. May be. Moreover, in this embodiment, although the high pressure water for soil softening was used, fluids other than water may be used.

  The present invention can be applied to a horizontal hole drilling device for a lead-in pipe to a residential land.

The basic block diagram of embodiment by this invention. The block diagram of a top rod. The block diagram of a connection rod. The top view of a connecting rod. The connection structure figure of a drilling drill structural member. The block diagram of a drive device. Schematic which installed the horizontal hole excavation apparatus by this invention in the excavation construction site. The external view of the leading rod and connecting rod which concern on this invention. The external view which expands and shows the connection part of the pipe members shown in FIG. Explanatory drawing which shows the curved state of the connecting rod shown in FIG. Sectional drawing which shows the connection part of the leading rod and connecting rod shown in FIG. The partial external view of the spring screw of this invention. Sectional drawing of the spring screw shown in FIG.

Explanation of symbols

1: Horizontal drilling device, 2: Drilling drill, 3: Drive device, 4: Rod body: 5: Spring screw, 6: Water injection nozzle, 7: Lead rod, 8: Connecting rod, 9: Elastic material, 10 : Pipe member, 10a: large diameter pipe member, 10b: intermediate pipe member, 10c: connecting pipe member, 11: moving base, 12: high pressure water pump, 17: head, 18: pressing rod, 19: lever, 20: Wire, 20a: Wheel, 21: Hose, 21a: Coupler, 22: Groove, 23: Leaf spring, 24: Bolt, 25: Connection ring, 26: Male tube, 17: Projection, 28: Female tube, 29: Recessed part, 30: Hole, 31: Hole, 32: Coil spring, 33: Rivet bolt, 34: Click pin, 35: Guide rail, 36: Support rod, 37: Rod coupling tube, 38: Bolt, 39: Wire operation tool, 39a : Control lever, 40: 41: bearing, 42: rotating plate, 43: coupling screw, 44: driving sprocket, 45: driven sprocket, 47: rotation transmission means, 51: horizontal hole excavating device, 52: driving device main body, 53: Muddy water reservoir, 54: Rail with gear (transportation means), 55: Jack, 56: Rack gear, 57: Wheel with gear, 58: Bogie, 59: Motor, 61: Handle, 62: Drilling drill, 63: Lead rod, 64 : Connecting rod, 65: Spring screw, 67: High pressure water injection nozzle, 68: Jet injection device, 69: Hose, 70: Submersible pump, 71: Water intake with filter, 72: Hose, 73: Water storage tank, 74: Filter 75: hose, 76: filter, 77: rod introduction pipe, 78: pin, 80, 80a, 80b: pipe member, 81: elastic material, 82: Spring: 83: Outer peripheral surface, 84: Groove, 85: End surface, 86: Bolt insertion long hole, 87: Bolt, 88: Washer, 89: Connection portion, 90: Reduced diameter portion, 91: Inner peripheral surface, 92: Expanded portion, 93: hole, 94: bolt, 95: reduced diameter outer peripheral surface, 97: screw hole, 98: large diameter pipe member, 99: head, 103: wire operation tool, 107: bolt, 108a, 108b: Axial end face, S: sidewalk, HP: residential land pit, RP: road side pit, UG: U-shaped side groove, LG: L-shaped side groove, PB: pit bottom, W: wire.

Claims (7)

In a horizontal hole drilling device comprising a drilling drill disposed substantially horizontally and a drive device connected to a root side end of the drilling drill,
The excavation drill is composed of a rod-shaped rod body and a spring screw provided separately from the rod body on the outer periphery of the rod body,
The rod body is elastically bendable with the spring screw,
The drive device includes a screw rotating means that transmits rotation to the spring screw and is blocked from transmitting rotation to the rod body. The rod body is composed of a leading rod provided with a water jet nozzle at the tip, and a connecting rod of a predetermined length detachably coupled to the rear end of the leading rod according to the excavation length, The rod is composed of a pipe member connected through an elastic material along the axial direction, and the leading rod has a cone-shaped head on which the water injection nozzle is mounted, and the head is used to change the head direction. The horizontal hole excavation device according to claim 1, wherein a wire is connected. The horizontal hole excavation device according to claim 2, wherein a hose connected to the water injection nozzle and the wire are inserted into the rod body. Each rod has a spring screw having a length corresponding to each rod on the outer peripheral portion, and the hose and wire having a length corresponding to each rod inside, and the rod body connects the rods together, The horizontal hole excavation device according to claim 3, wherein the rod is formed by connecting a spring screw, a hose, and a wire of each rod. Each tube member of each rod is formed with axial grooves on both upper and lower side surfaces on the outer peripheral side, and is mounted with a leaf spring that fits in the groove across the adjacent tube members, The horizontal hole excavation device according to any one of claims 2 to 4, wherein the horizontally arranged rods are allowed to bend in the vertical direction, and twisting between adjacent pipe members is prevented. The drive device is mounted on a moving base that presses the excavation drill in a horizontal direction, a rod coupling pipe for connecting the connecting rod fixed on the moving base, and an outer periphery of the rod coupling pipe via a bearing. A rotating screw, a connecting screw for coupling the spring screw fixed to the rotating plate, a wire operating device for pulling the wire, and a rotation transmitting means for connecting the motor and the rotating plate. The horizontal hole excavation device according to any one of claims 2 to 5, wherein A high-pressure water pump connected to the hose, recovering water injected from the water injection nozzle in a muddy water reservoir, returning the recovered muddy water to the high-pressure water pump through a plurality of filters, from the high-pressure water pump; The horizontal hole excavating apparatus according to claim 3, wherein the horizontal hole excavating apparatus is re-supplied to the water injection nozzle.

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