JP4076554B2 - Excavator, rotary excavator equipped with excavator and underground excavation method - Google Patents

Description

The present invention relates to a drilling device, a rotary excavator provided with the drilling device, and an underground excavation method.
More specifically, the present invention relates to a drilling device that can perform a drilling operation with low vibration and low noise, a rotary excavator equipped with the drilling device, and an underground excavation method.
In addition, the excavation is designed to improve the efficiency of supplying soil reinforcing material and / or consolidated material to the underground void formed by excavation, and to prevent the collapse of the underground void when the excavator is pulled up. The present invention relates to an apparatus, a rotary excavator provided with an excavator, and an underground excavation method.

  In the field of civil engineering and architecture, an excavator called “down the hole hammer” is used for excavating hard ground mainly containing rock, rocks, concrete, and the like. A down-the-hole hammer moves a hammer bit at the tip up and down by supplying compressed air and driving an internal piston, and performs excavation by hitting the hammer bit (see, for example, Patent Document 1).

There is also an excavator called an “earth auger” that drills holes with a spiral cone, but the earth auger is more suitable for excavation of hard ground where rock, rocks, concrete, etc. exist than the down-the-hole hammer described above. Is not suitable.
Japanese Patent Laid-Open No. 9-328983 (FIG. 1)

  In recent years, a construction method has been proposed in which drilling work is carried out using cement milk that can be supplied from the vicinity of the tip of the down-the-hole hammer in civil engineering foundation work, in which drilling holes are drilled in the ground and foundation piles are embedded. ing.

  By using this down-the-hole hammer, it is possible to supply cement milk to the inside of the excavation hole simultaneously with the pulling-down operation of the down-the-hole hammer after drilling. As a result, compared to the conventional method in which the drilling work of the drilling hole and the work of pouring cement milk into the drilling hole were separate processes, the work efficiency was improved and the drilling hole collapsed when the down-the-hole hammer was pulled up. The problem that the foundation pile cannot be inserted can be prevented.

However, in the conventional down-the-hole hammer described above, as shown in FIG. 1 of Patent Document 1, a hammer bit having the same diameter as that of the hole to be drilled is moved up and down to hit the ground. The impact on the ground was large, and intense noise and vibration occurred during excavation.
For this reason, for example, it is not suitable for use in a densely populated house or an office district in an urban area where work with lower vibration and noise is desired.

(Object of the present invention)
SUMMARY OF THE INVENTION An object of the present invention is to provide a drilling device, a rotary excavator equipped with a drilling device, and an underground drilling method capable of performing a drilling operation with low vibration and low noise.

  Another object of the present invention is to improve the efficiency of supplying soil reinforcing material and / or consolidated material to the underground void formed by excavation work, and to prevent the underground void from collapsing when the excavator is pulled up. An object of the present invention is to provide a drilling device, a rotary excavator equipped with a drilling device, and an underground excavation method that can be prevented.

  Other objects of the present invention will become apparent from the following description.

Means taken by the present invention to achieve the above object are as follows.
In addition, although the code | symbol used in drawing is described using the parenthesis in order to help the understanding of description of the effect | action mentioned later, each component is not limited to the thing of drawing description.

In the first invention,
An excavation device for underground excavation provided with bits (41, 42) for performing excavation by advancing and retreating to the excavation side of the excavation device main body (2) when a striking force is given by the energy of the working fluid,
The bits (41, 42) are smaller than the excavator body (2) and are provided in a plurality, and the bits (41, 42) are configured to be driven to strike each other at different times.
It is characterized by comprising means for applying or supplying a soil reinforcing material and / or a consolidated material to the underground void (93) generated by excavation by the bit (41, 42),
Drilling rig.

In the second invention,
It is equipped with a bit (41, 42) that advances and retreats to the excavation side of the excavator body (2) when a striking force is given by the energy of the working fluid, and has a supply path for soil reinforcing material and / or consolidated material A drilling device for underground excavation that can be used by connecting to the front side of the shaft member (7) provided,
The bits (41, 42) are smaller than the excavator body (2) and are provided in a plurality, and the bits (41, 42) are configured to be driven to strike each other at different times.
Means for applying or supplying a soil reinforcing material and / or a consolidation material to the underground void (93) generated by excavation by the bit (41, 42),
The means for applying or supplying the soil reinforcement or / and the consolidation agent is:
The soil reinforcement or / and consolidation material outlet (94,94) provided on the excavation side of the excavator body (2);
A soil reinforcing material and / or a caking material flow path communicating the discharge port (94, 94) and the supply path of the shaft member (7);
It is characterized by having
Drilling rig.

In the third invention,
It has a spiral blade (38) on the outer periphery,
The excavator according to the first or second invention.

In the fourth invention,
A bit (41, 42) is provided on the excavation side, and includes a piston case (22) containing a piston that gives impact force to the bit (41, 42) by the energy of the working fluid,
A plurality of piston cases (22) are accommodated in the excavator body (2) corresponding to the number of the bits (41, 42),
A drilling rig according to any one of the first to third inventions.

In the fifth invention,
The excavator body (2) is provided with a vibration-proof material and / or a sound-proof material (230) so as to surround the piston case (22),
A drilling device according to a fourth invention.

In the sixth invention,
A shaft member (7) having a supply path for soil reinforcing material and / or consolidated material;
The excavator (1) according to any one of claims 1 to 5, wherein the excavator (1) is connected to the front side of the shaft member (7) and receives supply of soil reinforcing material and / or consolidated material from the supply path. ) (1a) (1b) (1c)
It is characterized by having,
An excavator provided with a shaft member.

In the seventh invention,
An excavation device for underground excavation provided with bits (41, 42) for performing excavation by advancing and retreating to the excavation side of the excavation device main body (2) when a striking force is given by the energy of the working fluid,
A spiral blade (38) is provided on the outer periphery of the drilling rig, and a plurality of bits (41, 42) are provided smaller than the drilling rig body (2), and the bits (41, 42) are connected to each other in time. It is configured to drive by striking the ball,
Drilling rig.

In the eighth invention,
Excavation device (1) (1a) (1b) (1c) according to any one of the first to sixth inventions, and the excavation device (1) (1a) (1b) (1c) A rotation drive device (5) capable of,
It is a rotary excavator.

In the ninth invention,
An underground excavation method using the excavator (1) (1a) (1b) (1c) according to any one of the first to sixth inventions,
At the time of excavation work by the excavator (1) (1a) (1b) (1c) and / or when the excavator is lifted after excavation work, the excavator (1) ( 1a) (1b) (1c) is characterized in that it prevents the collapse of the hole wall by applying or supplying a soil reinforcing material (94) and / and a consolidation material (95),
Underground excavation method.

  As the working fluid, a gas such as air (eg, compressed air) or a liquid such as water or oil can be employed.

In the present specification and the specification, the “soil reinforcing material or / and the consolidated material” may include either one of the soil reinforcing material or the consolidated material, or the soil reinforcing material and the consolidated material. May include both. Examples of the soil reinforcing material include clay minerals such as bentonite.
Examples of the binder include cement milk, cement mortar, and other chemicals.

  A spiral blade can be provided on the outer periphery of the excavator. The spiral blade may be provided over the entire excavator or may be provided partially on a part of the excavator. Moreover, this spiral blade | wing can be formed in hollow shape and the hollow part can also be used as a flow path of a soil reinforcement material and / or a consolidation material.

  The term “vibration-proof material or / and sound-proof material” as used in the present specification and claims may include either one of the vibration-proof material or the sound-proof material, or both of the vibration-proof material and the sound-proof material ( In some cases, including those having both anti-vibration and sound-proofing effects).

  Examples of the shaft member used by being connected to the excavator include a screw shaft and a kelly rod.

(Work)
The excavator (1) (1a) (1b) (1c) according to the present invention operates as follows.
The bits (41, 42) of the drilling rig (1) (1a) (1b) (1c) are moved forward and backward to the drilling side of the drilling rig main body (2) by being given a striking force by the energy of the working fluid. I do. A plurality of bits (41, 42) are provided that are smaller than the excavator body (2), and the bits (41, 42) are driven to strike with a time lag. Therefore, the impact of the ground received every time the bit (41, 42) is hit is small.

  Excavators (1), (1a), (1b), and (1c) having means for applying or supplying soil reinforcement or / and caking materials include hole walls generated by excavation by bits (41, 42), etc. Apply or supply soil reinforcing material and / or consolidation material to the underground void (93). As a result, it is possible to prevent the underground void portion (93) from collapsing after the excavating devices (1), (1a), (1b), and (1c) formed by excavation work are lifted.

  Further, the excavator (1) (1a) (1b) (1c) which can be used by being connected to the front part side of the shaft member (7) is a soil reinforcing material and / or consolidated from the supply path of the shaft member (7). The material is supplied to the excavator (1) (1a) (1b) (1c). Further, the soil reinforcing material and / or the caking material flows through the flow path of the excavator (1) (1a) (1b) (1c) and the discharge port (94, 94) provided on the excavation side of the excavator body (2). 94).

  The excavator (1c) having the spiral blade (38) on the outer periphery can send the crushed rock mass and earth and sand (slime) generated during excavation more efficiently to the ground surface by the spiral blade (38). (Can be earthed).

  When the piston case (22) containing a piston that gives impact force to the bits (41, 42) by the energy of the working fluid is provided, the piston is covered with the piston case (22), and this piston case A plurality of (22) are accommodated in the excavator body (2) corresponding to the number of bits (41, 42). As a result, vibration and sound generated when the piston is driven are less likely to leak out or be transmitted.

  In the case where the excavator body (2) is provided with a vibration isolating material and / or a sound insulating material (230) so as to surround the piston case (22), vibration and sound generated when the piston is driven are And the soundproofing material (230) relaxes.

The rotary excavator according to the present invention includes excavators (1), (1a), (1b), and (1c) for underground excavation, and a rotary drive device (5), and operates as follows.
The excavation work is performed while applying a rotational motion to the excavators (1), (1a), (1b), and (1c) by the rotation drive device (5). By giving the rotational motion, the excavation position of the bid (42) included in the excavator (1) (1a) (1b) (1c) moves relative to the excavation surface. Thereby, a bid (41, 42) hits the whole excavation surface uniformly.

The present invention has the above-described configuration and has the following effects.
(A) According to the excavator according to the present invention, a plurality of bits are provided which are smaller than the excavator body, and the bits are configured to be driven to strike each other at different times. Therefore, compared to the conventional down-the-hole hammer that hits the ground by moving a hammer bit of the same diameter as the hole to be drilled, the impact of the ground received by each bit hit is small, low vibration, low noise Excavation work can be done with. Therefore, it is suitable for use in a densely populated residential area or an urban office area where work with lower vibration and noise is desired.

(B) In addition, as described above, conventionally, it has been necessary to drive a hammer bit having a diameter substantially the same as that of the hole to be drilled, so that a large amount of air is required to move the hammer bit up and down. A relatively large air compressor was required.
On the other hand, in the present invention, since a relatively small bit may be driven, a consumption amount of a working fluid (for example, air) for advancing and retreating one bit is small, and as a result, a supply device that supplies the working fluid (For example, when the working fluid is air, the air compressor) can be reduced in size. Therefore, the installation area of the supply device is small, and it is suitable for construction in a limited space such as a densely populated house or an urban office district.
Further, since the supply device can be downsized, the drive means such as an engine for driving the supply device can be downsized, so that vibration and noise generated from the drive means can be suppressed to a low level.

(C) Further, in the excavator provided with means for applying or supplying the soil reinforcement or / and the consolidation material, the soil reinforcement or / and the consolidation in an underground void such as a drill hole formed by excavation by the bit. Material can be applied or supplied. As a result, compared to the conventional method, where the excavation work and the work of pouring cement milk or other solidified material into the underground void are separate processes, the work efficiency can be improved and the ground when the excavator is lifted can be increased. Collapse of the middle void can be prevented.

(D) The excavator having a spiral blade on the outer periphery can send the crushed bedrock and earth and sand (slime) generated during excavation to the ground surface more efficiently by using the spiral blade. it can).

(E) In a drilling rig having a piston case containing a piston that gives a biting force to the bit by the energy of the working fluid, the piston is covered with the piston case, and the piston case is further inserted in the drilling rig body. A plurality are accommodated corresponding to the number of
As a result, it is possible to prevent the vibration and sound generated during the driving of the piston from leaking or being transmitted to the outside as much as possible, and to further reduce the vibration and noise.

(F) In a drilling device in which a vibration-proofing material and / or a soundproofing material is provided in the drilling device main body so as to surround the piston case, it is more effective that vibration and sound generated when the piston is driven leak or propagate to the outside. Can be prevented.

(G) A rotary excavator according to the present invention includes an excavation device for underground excavation and a rotation drive device, and is configured so that excavation work can be performed while applying a rotary motion to the excavation device by the rotation drive device. Has been. By giving the rotational motion, the excavation position of the bid (42) included in the excavator (1) (1a) (1b) (1c) moves relative to the excavation surface. Thereby, the bid (41, 42) can hit the entire excavation surface evenly.

(H) According to the underground excavation method according to the present invention, during excavation work by the excavator and / or when the excavator is lifted after excavation work, the soil reinforcing material is provided from the excavator to the excavation hole formed by the excavation work. Alternatively, and / or by applying or supplying a binder, collapse of the pore walls can be prevented.

  EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to these.

  The invention will be explained in more detail on the basis of an embodiment shown in the drawing.

1 to 4 are views for explaining a first embodiment of the excavator according to the present invention.
FIG. 1 is an explanatory view of the excavator 1 as seen from the bottom perspective direction (front perspective direction on the excavation side),
2 is a longitudinal cross-sectional explanatory view of the excavator 1 shown in FIG.
FIG. 3 is a partial explanatory view of the base side of the excavator when the excavator 1 shown in FIG. 2 is viewed from the plane direction (the direction opposite to the excavation side).
FIG. 4 is an exploded perspective view of the excavator 1 shown in FIG. 1 and shows a state in which the excavation bit member 2 removed from the air tank member 3 is disassembled.
FIG. 5 is an explanatory side view showing a rotary excavator 6 mainly composed of the excavator 1 and the rotary drive device 5 shown in FIG.
4, the base side of the air tank member 3 shown in the upper part of the drawing is omitted, and the flow pipe 262 of the excavation bit member 2 shown in FIG. 2 is omitted.

As described above, the rotary excavator 6 shown in FIG. 5 includes the excavator 1 for underground excavation shown in FIG. 1 and the rotary drive device 5 that can give the excavator 1 a rotational motion. .
First, the excavator 1 will be described in detail, and then the rotary drive device 5 will be described.

[Excavator 1]
Reference is mainly made to FIGS.
The entire excavator 1 is formed in a substantially cylindrical shape. The digging apparatus 1 includes a digging bit member 2 that is a digging apparatus main body located on the digging side (front side), and an air tank member 3 located on the side opposite to the digging side (base side).

  The air tank member 3 is detachably connected to the base side of the excavation bit member 2 by a bolt 32 and a nut 31 which are fixing tools. Specifically, a bolt 32 (see FIG. 4), which is a fixing tool, is required and fixed to the joint surface side of the base end side of the excavation bit member 2 (piston case mounting body 23 described later). In this embodiment, the bolts 32 are provided at equal intervals at five locations (one location in FIG. 2 and two locations in FIG. 4 but the others are hidden). And the air tank member 3 and the excavation bit member 2 can be connected by passing the bolt 32 of the excavation bit member 2 through the bolt hole 311 of the air tank member 3 and fastening with the nut 31.

  The excavation bit member 2 includes a plurality of bits 41 and 42 on the tip side. The bits 41 and 42 perform excavation by advancing and retreating to the excavation side of the excavator body 2 when a striking force is given by the energy of air that is a working fluid. A plurality of bits 41 and 42 are provided that are smaller than the excavation bit member 2, and the bits 41 and 42 are configured to be driven to strike with a time lag.

  In the present embodiment, as shown in FIG. 1, the bits 41 and 42 are provided at one location (indicated by reference numeral 41) at the axial center portion of the excavation bit member 2 and at equal intervals on the circumference centered on the axial center portion. A total of six locations (indicated by reference numeral 42) are arranged at six locations. Each bit 41, 42 is not simultaneously but staggered at a high speed (1200 to 1300 times per minute per bit, 7200 to 7800 times per minute as a whole) and vibrates (moves up and down or moves back and forth). Excavate the ground.

  Specifically, the bit 41 and the bit 42 are not simultaneously driven but are driven at different times, and the bits 42, 42, 42, 42, 42 provided at the five locations are also driven at different times and not simultaneously. . The advance / retreat stroke of each bit 41, 42 is, for example, about 1 to 3 cm. The air tank member 3 can store air, which is a working fluid that drives the bits 41 and 42, in a high pressure state.

  The excavator 1 applies or supplies a soil reinforcing material and / or a consolidated substance (hereinafter sometimes referred to as “soil reinforcing material”) to the underground voids generated by underground excavation by the bits 41 and 42. It has. As shown in FIG. 5, the excavator 1 can be used by being connected to the front side of a screw shaft 7 which is a shaft member having a built-in supply path such as a soil reinforcing material. The operation of the screw shaft 7 will be described later.

  As shown in FIG. 2, the means for applying or supplying the soil reinforcing material or the like includes a discharge port 44 for soil reinforcing material or the like provided on the bits 41 and 42 side (excavation side) of the excavation bit member 2, and the discharge port. 44 and an internal flow path that is a flow path of a soil reinforcing material or the like that communicates the supply path of the screw shaft 7 described above. Details of the internal flow path will be described later.

  The soil reinforcing material and the like are supplied into the excavator 1 from the screw shaft 7 shown in FIG. Further, the gas flows through the internal flow path of the excavator 1, and is finally discharged out of the excavator 1 through the opening / closing valve 45 (see FIG. 2) that is opened by pressure. As shown in FIG. 1, the number of discharge ports 44 (shown by broken lines) is a required number (a plurality of two in this embodiment) at a required position between the bit 42 and the bit 42 on the tip surface of the chuck guide 25 described later. Place).

  As shown in FIG. 2, the opening / closing valve 45 that opens and closes the discharge ports 44 is disposed at one end of the internal flow path, and opens and closes outward about the shaft portion 451. A large number of button tips 412 made of hard alloy are provided on the surface of the on-off valve 45. The on-off valve 45 is configured to be opened when a supply pressure such as a soil reinforcing material is applied to the internal flow path of the excavation bit member 2.

Hereinafter, the constituent members of the excavator 1 will be described in detail in order with reference to FIGS. 1 to 4.
As described above, the excavator 1 includes the excavation bit member 2 located on the excavation side (front side) and the air tank member 3 located on the base side.

(Drilling bit member 2)
As shown in FIG. 4, the excavation bit member 2 includes, in order from the top, a piston case 22 having a connecting body 21 and containing a driving means including a piston, a piston case mounting body 23, a drive chuck 24, a chuck guide 25, Bits 41 and 42 are provided.

  The piston case 22 is made of metal and has a cylindrical shape. A connecting body 21 is screwed to the base end portion (upper portion in FIG. 4) of the piston case 22. Bits 41 and 42 are connected to the tip of the piston case 22 (lower part in FIG. 4) via a drive chuck 24 and a chuck guide 25. The piston case 22 is provided in the same number as the bits 41 and 42 (in this embodiment, a plurality of and six locations).

  The piston case 22 accommodates drive means including a piston for operating the bits 41 and 42. The drive means is a known down-the-hole hammer drive mechanism such as a cylinder, check valve, air distributor, valve spring, make-up ring, O-ring, piston retainer ring, bit retainer ring, etc. -92288) can be employed.

  The operation of this drive mechanism will be briefly explained. The air introduced into the piston case 22 moves to the lower side of the piston to raise the piston, and then, as the piston rises, the air turns to the upper side of the piston and lifts. Pull down the piston. By repeating this, the piston moves up and down and gives an impact force to the bits 41 and 42 on the excavation side.

  The connection body 21 located at the base end portion of the piston case 22 has a hole 211 (not visible in FIG. 4, see FIG. 2) as a working fluid path, and the base end side is formed in a convex cross section. . The convex portion constitutes the insertion portion 222, and the insertion portion 222 is inserted into the air tank member 3 and attached. Then, the driving means in the piston case 22 is driven by the air sent from the air tank member 3 through the insertion portion 222 of the connection body 21. In the circumferential direction of the insertion portion 222, a required number (in the present embodiment, a plurality) of O-rings 223 are provided so as to maintain the airtightness of the air sent from the air tank member 3.

  Each piston case 22 (five in this embodiment) is detachably attached to a piston case attachment body 23 (see FIG. 4) which is a substantially cylindrical attachment body. The piston case mounting body 23 includes a cylindrical main body 231 (see FIG. 2), and a cover body 233 (hereinafter referred to as a “front cover body 233”) fixed to an opening on the front side of the cylindrical main body 231. The cover body 234 is mainly composed of a cover body 234 (hereinafter referred to as “base cover body 234”) fixed to the opening on the base side of the cylindrical main body 231.

  Furthermore, a piston case casing 232 (see FIG. 2), which is a cylindrical and elongated casing, is accommodated inside the piston case attachment body 23. The piston case casing 232 is attached in a state where the piston case 22 is inserted. The piston case casing 232 is provided in the same number as the piston case 22, and the axial center direction is provided so as to be the same as the longitudinal direction of the piston case attachment body 23.

  The front cover body 233 and the base cover body 234 have required thicknesses, and are provided with insertion holes 235 and 236, which are holes for inserting the piston case 22, respectively. In this embodiment, the insertion holes 235 and 236 are arranged at six places in total at one place in the center and five places at equal intervals on the circumference centered on the center.

  As shown in FIG. 2, the above-described piston case casing 232 is fixed in a state sandwiched between the upper and lower cover bodies 233 and 234 and is accommodated in the cylindrical main body 231. A hole (reference numeral omitted) on the tip end side of the piston case casing 232 communicates with the insertion hole 235 of the front cover body 233. A hole (reference numeral omitted) on the base end side of the piston case casing 232 communicates with the insertion hole 236 of the base cover body 234.

  Further, sand 230 (see FIG. 2) is provided as a vibration-proof material and / or a sound-proof material in the underground gap formed between the piston cases 22 and 22 in the piston case mounting body 23 (tubular body 231). Filled.

  Further, the tip portion of the piston case 22 partially protrudes from the tip cover body 233. The base end side of the substantially cylindrical drive chuck 24 shown in FIG. 4 is attached to the hole (not shown) of the protruding portion in a state where it is slightly pushed. The base side of the bits 41 and 42 is accommodated in the hole 241 on the distal end side of the drive chuck 24 via the chuck guide 25 so as to freely advance and retract.

  The chuck guide 25 has a substantially circular shape in plan view and has a required thickness, and is fixed to the tip of the piston case mounting body 23 (the front cover body 233). For fixing the chuck guide 25, a bolt 251 which is a fixing tool fixed to the chuck guide 25 and a nut 252 attached from the piston case attachment body 23 side are used.

  In this embodiment, five bolts 251 are provided at equal intervals on the base side of the chuck guide 25 (one place in FIG. 2 and two places in FIG. 4 but the other bolts 251 do not appear hidden). is there. The chuck guide 25 can be attached to the piston case mounting body 23 by passing the bolt 251 of the chuck guide 25 through the bolt hole 237 of the piston case mounting body 23 and tightening and fixing it with the nut 252.

  On the front side of the chuck guide 25, a concave portion 253 having a circular shape in bottom view and a concave portion 254 that is a V-shaped groove in a bottom view so as to surround the concave portion 253 are provided in the center. In the concave portion 253, a bit 41 having a head portion 411 having a circular shape in a bottom view is disposed. In the recess 254, a bit 42 provided with a head portion 421 having a triangular shape in a bottom view is disposed. A number of cemented carbide button chips 412 are provided on the head portions 411 and 421 of the respective bits 41 and 42.

The chuck guide 25 is provided with a mounting hole 255 which is a mounting portion configured by the same number of holes as the bits 41 and 42. The attachment hole 255 is located in the recess 253 and the recess 254 described above. The tip of the drive chuck 24 is fitted into the base side of the mounting hole 255.
The drive chuck 24 has a hexagonal nut-shaped detent portion 242, and a hexagonal recess 256 (see FIG. 2) into which the detent portion 242 is fitted is formed in the mounting hole 255 of the chuck guide 25.

  The base side of the bits 41 and 42 is formed as a spline shaft, and the base side is fitted from the tip of the mounting hole 255 to thereby form a concave and convex engaging groove (not shown) on the inner peripheral wall. It is installed inside. The base sides of the bits 41 and 42 are mounted so as not to be detached from the drive chuck 24 side by the above-described bit retainer ring and O-ring.

  Further, as shown in FIG. 1, a required number of flat bars 26 that are protrusions along the axial direction are provided on the outer periphery of the piston case attachment body 23. In this embodiment, a plurality of flat bars 26 (six places in total) are provided at a required interval in the circumferential direction. The crushed bedrock and earth and sand (slime) generated in the hole excavated during the excavation work of the ground are the hole and flat bar excavated by the air injected from the front side of the excavation bit member 2 (chuck guide 25). It is sent to the ground surface through a gap between 26 and 26.

(Air tank member 3)
As shown in FIG. 4, a connecting body 33 for connecting to the base end portion of the excavation bit member 2 (the insertion portion 222 at the top of the piston case 22) is provided on the front side of the air tank member 3.

  The screw shaft 7 shown in FIG. 5 is connected to the base end portion of the air tank member 3 (see FIG. 2, upper end portion in FIG. 2), and air and soil reinforcing material or / and consolidated material are introduced from the screw shaft 7. A connecting joint 34 is provided. Air circulation paths 340 and 340 (see also FIG. 3) are arranged in parallel in the connection joint 34. Between the air flow paths 340 and 340, a flow hole 37 that constitutes a part of the internal flow path of the soil reinforcing material and / or the consolidated material is provided.

  The air introduced from the connection joint 34 is stored in the air storage section 30 partitioned by the partition body 341 configured by a plate body having a circular shape in plan view. Reference numeral 340 indicates a blowout port of the connection joint 34. Then, air is sent to each piston case 22 connected to the coupling body 33 through an air circulation path formed by the air hoses 351 and 352 and the circulation hole 331 formed in the coupling body 33. The flow hole 331 is connected to the hole 211 of the insertion part 222 of the piston case 22.

  For convenience of illustration, not all the air hoses are shown in FIG. 2, but the air hoses 351 and 352 are provided in the same number as the piston case 22 (five in this embodiment). One end of each air hose 351, 352 is connected to one of the connection holes 342 provided in the partition 341, and the base end of each of the air hoses 351, 352 is connected to one of the flow holes 331 of the connection body 21. Connected to the mouth.

  Here, the lengths of the air hoses 351 and 352 are not all the same, but are set to different lengths. Thereby, the time required for the sent-out air to reach each piston case 22 from the air reservoir 30 is not the same, but is different. As a result, the bits 41 and 42 attached to the tip portion of the piston case 22 can move up and down while excavating each other, and can excavate the ground.

  As shown in FIG. 2, the base side of the air tank member 3 is formed to be slightly recessed toward the base end portion with the connecting body 33 as a boundary. The outer diameter of the small-diameter portion 36 formed slightly smaller than the connecting body 33 is made to match the inner diameter of a cylindrical drive bush 51 provided in the rotary drive device 5 (see FIG. 5) described later. It has been. Then, when the drive bush 51 is fitted and dropped from the base end portion of the excavator 1 with the excavator 1 standing, the drive bush 51 is a portion where the diameter of the air tank member 3 is large (near the coupling body 33). Stops and does not fall down. Details of this operation will be described later. The explanation of the internal flow path 37 of the soil reinforcing material and / or the consolidated material will also be described later.

  Further, as shown in FIG. 1, a required number of flat bars 361 which are ridges are provided on the outer periphery of the air tank member 3 along the axial direction. In this embodiment, a plurality of flat bars 361 (six places in total) are provided. During the excavation work, the flat bar 361 engages with an engagement groove provided on an inner wall portion of a drive bush 51 of a rotary drive device 5 (see FIG. 5) provided with a rotary table (rotary table) described later. The rotational driving force (rotational motion) of the drive bush 51 is transmitted to the excavator 1.

  With the above-described configuration, air supplied from the connection joint 34 during excavation work is introduced into the piston case 22 of the excavation bit member 2 through the air hoses 351 and 352 of the air tank member 3, and the piston inside the piston case 22. To move the bits 41 and 42 at the tip up and down.

(Internal flow path of excavation apparatus 1)
Next, an internal flow path of the soil reinforcing material and / or the consolidated material provided in the excavation apparatus 1 will be described with reference mainly to FIG. Hereinafter, for convenience of explanation, an internal flow path provided in the air tank member 3 is referred to as a “first internal flow path”, and an internal flow path provided in the excavation bit member 2 is referred to as a “second internal flow path”.

  The first internal flow path provided in the air tank member 3 includes the first flow hole 371 of the connection joint 34 described above, the flow pipe 372 provided through the air reservoir 30 and penetrating the partition body 341, and the connection body. The second flow hole 373 is provided mainly through the 33.

  A proximal end portion (upper end portion in FIG. 2) of the flow pipe 372 is inserted into the flow hole 371. Further, the other end of the flow pipe 372 branches into two branches, and the other end communicates with each of the second flow holes 373 provided in two places (one of the flow holes 373 is hidden and does not appear in FIG. 2). .

  On the other hand, the number of second internal flow paths provided in the excavation bit member 2 corresponds to the number of flow holes 373 and 373 in the first internal flow path (two in this embodiment, the second internal flow path). One is hidden).

  The second internal flow path includes a first flow hole 261 penetrating the cover body 234 on the base side (upper side in FIG. 2), a flow pipe 262 installed in the cylindrical main body 231, and a front side. A second flow hole 263 provided through the cover body 233 and a third flow hole 264 provided through the chuck guide 25 are mainly configured. The base end of the flow pipe 262 communicates with the first flow hole 261 and the other end communicates with the second flow hole 263. The third flow hole 264 communicates with the discharge port 44 of the above-described soil reinforcing material or the like.

  When the excavation bit member 2 is assembled (see also FIG. 4), when the chuck guide 25 is connected to the cover body 233 of the piston case mounting body 23, the second flow hole 263 and the third flow hole 46 communicate with each other. Then, when the air tank member 3 and the excavation bit member 2 are connected, the first internal flow path and the second internal flow path communicate with each other, and an internal flow path that penetrates the excavation bit member 2 is formed.

  With the above-described configuration, when the soil reinforcing material or the like is supplied from the connection joint 34, the soil reinforcing material or the like passes through the internal flow path of the excavation bit member 2 and is discharged from the discharge ports 44 and 44 through the opening / closing valve 45. 1 is discharged to the outside.

[Rotary drive device 5]
On the other hand, the rotary drive device 5 shown in FIG. 5 gives the excavator 1 a rotational motion as described above. The rotation drive device 5 includes a rotation drive device main body 50 and an outrigger 52 that supports the rotation drive device main body 50. As described above, the rotary drive device main body 50 can be equipped with the excavator 1 via the drive bush 51 and includes a rotary table (not shown hidden in FIG. 5) that gives the excavator 1 a rotational motion. Since the rotary drive device 5 employs a known technique, a detailed description of its structure is omitted.

(Work)
FIG. 6 is a diagram for explaining an underground excavation method using the excavator 1 shown in FIG. 1.
The operation of the excavating apparatus 1 and the rotary excavator 6 will be described with reference to FIGS.

  In addition, a present Example demonstrates the effect | action of the apparatus 1 for excavation, and the rotary excavator 6 taking the case where the hole for foundation piles, such as H-shaped steel, is excavated in the ground (ground). A foundation pile such as H-shaped steel is used, for example, in civil engineering foundation work to form a continuous wall for earth retaining together with a plate member in the ground.

  First, as shown in FIG. 5, the rotary drive device 5 that constitutes the rotary excavator 6 together with the excavating device 1 is placed on a temporary scaffold 600 made of, for example, H steel. On the other hand, the required number (required number) of screw shafts 7 is connected to the base end portion of the excavator 1 according to the length of the hole excavated in the ground.

In this embodiment, one screw shaft 7 is connected, but two or more (a plurality) may be connected.
The screw shaft 7 incorporates an air supply pipe and a supply path such as a soil reinforcement. The screw shaft 7 and the excavator 1 are fixed by a fixing tool (not shown) made up of pins, bolts, nuts and the like. The screw shaft 7 includes a spiral blade 75. The spiral blade 75 is provided with a notch portion (not shown) that engages with a locking portion provided on the inner wall portion of the drive bush 51 of the rotary drive device 5 at a required position. The excavator 1 having the screw shaft 7 is suspended by a crane (not shown in the drawing). Reference numeral 73 in FIG. 5 indicates a wire connected to the crane.

  Then, the drive bush 51 is set on the rotary table (not shown in FIG. 5) of the rotary drive device 5. Further, the flat bar 361 of the air tank member 3 of the excavator 1 is engaged with the engaging groove which is the groove on the inner wall of the drive bush 51 while being suspended by the crane. Then, excavation is started while the excavator 1 is suspended by the crane.

  During excavation, the rotational driving force transmitted from the rotary table to the drive bush 51 is transmitted to the air tank member 3 and the excavator 1 rotates. At the upper end of the kelly rod 7, a suspension shaft 71 for suspension by a crane is provided. A first supply pipe 72 that is a supply pipe that supplies air to the excavation device 1 via the screw shaft 7 and a second supply pipe 74 that supplies soil reinforcement and the like are connected to the suspension shaft 71. The suspension shaft 71 is provided with an air swivel (not shown).

  The air sent from the first supply pipe 72 is sent to the excavator 1 through the air supply pipe of the kelly rod 7. The air sent to the excavator 1 is stored in the air storage unit 30 via the connection joint 34 shown in FIG. Further, the air is introduced into each piston case 22 through the air hoses 351 and 352 of the air tank member 3 (see FIG. 2), and the driving means such as the piston is driven to move the bits 41 and 42 at the tip up and down.

  Since the air hoses 351 and 352 having different lengths cause a deviation in the time when air is introduced into each piston case 22, the bits 41 and 42 move up and down while shifting their time, and simultaneously hit the ground. There is nothing. Further, since the bits 41 and 42 have a small diameter with respect to the hole to be excavated, the impact of the ground received by each hit of the bits 41 and 42 is small.

  Further, the excavating device 1 is rotated by the rotation driving device 5, whereby the excavation position of the bit 42 included in the excavating device 1 moves with respect to the excavation surface. Thereby, the bits 41 and 42 hit the entire excavation surface evenly.

  Excavation holes are formed by excavation by the bits 41 and 42, and the excavation apparatus 1 digs in the ground. As the excavation operation further proceeds, when the screw shaft 7 shown in FIG. 5 descends to the position of the drive bush 51, the notch provided in the spiral blade 75 of the screw shaft 7 engages with the inner wall portion of the drive bush 51. It becomes like this. Then, the rotational driving force transmitted from the rotary table to the drive bush 51 is transmitted to the screw shaft 7 via the spiral blade 75.

  Moreover, the crushed bedrock and earth and sand (slime) generated at the time of excavation are smoothly sent to the ground surface through the spiral blade 75 of the screw shaft 7 (can be discharged).

  Further, as shown in FIG. 2, driving means such as pistons for operating the bits 41 and 42 are accommodated in the piston case 22 and further covered with a cylindrical piston case casing 232. And it is accommodated in the cylindrical main body 231 filled with the sand 230 which is a soundproof material. As a result, it is possible to prevent sound and vibration generated during driving of the driving means from leaking or being transmitted to the outside, and to reduce noise and vibration.

  As described above, excavation work can be performed with low noise and low vibration, compared with a conventional down-the-hole hammer that hits the ground by moving one hammer bit having almost the same diameter as the hole to be excavated. Therefore, it is suitable for use in densely populated houses and urban office districts.

  In this embodiment, since the rotary drive device 5 includes the outrigger 52, the outrigger 52 not only improves the stability during excavation work, but also places the rotary drive device body 50 directly on the ground surface for excavation. Compared with the case where the rotation is performed, the vibration transmitted from the rotary drive device body 50 to the ground plane is reduced. Thereby, low vibration and low noise can be achieved more effectively.

  Furthermore, as described above, conventionally, it has been necessary to drive a hammer bit having the same large diameter as the hole to be drilled, and therefore, the amount of air consumption necessary to move the hammer bit up and down is inevitably large. A big air compressor was needed.

  On the other hand, in this embodiment, it is only necessary to drive the small-diameter bits 41 and 42 with respect to the hole to be excavated, so that the amount of air consumed for moving one bit up and down is small, and as a result, Can reduce the size of the air compressor. Therefore, the installation area of the air compressor is small, and it is suitable for construction in a limited space such as a densely populated house or an urban office district. In addition, the miniaturization of the air compressor enables the prime mover that drives the air compressor to be miniaturized, so that the vibration and noise generated from the prime mover can be kept low.

  Further, during excavation work by the excavator 1, a soil reinforcing material such as bentonite is supplied to the screw shaft 7 from the second supply pipe 74 shown in FIG. As a result, as shown in FIG. 6A, the excavator 1 discharges the soil reinforcing material from the excavation ports 44 and 44 (see FIG. 1) on the excavation side of the excavator 1 while proceeding with the excavation work. As a result, the soil reinforcing material 94 is applied to or supplied to the peripheral wall of the excavation hole 93 which is an underground void portion generated by excavation by the bits 41 and 42.

  Next, when the excavation work is finished, the operation is switched so that a caking material such as cement milk can be supplied from the second supply pipe 74 shown in FIG. Then, when the excavator 1 is lifted after excavation work, by supplying a caking material to the screw shaft 7, as shown in FIG. 6B, the discharge ports 44 and 44 of the excavator 1 (see FIG. 1). Then, the consolidated material 95 is discharged through the on-off valves 45 and 45. Accordingly, the consolidated material 95 is applied or supplied to the bottom of the excavation hole 93 generated by excavation by the bits 41 and 42. The supply amount of the consolidated material 95 is about 1/3 of the depth of the excavation hole 93.

  Thereafter, the excavator 1 is lifted, a foundation pile such as an H-shaped steel is inserted and solidified, and finally the excavation hole 93 is filled with earth and sand. Thus, by applying or supplying the soil reinforcing material 94 and the consolidated material 95 from the excavator 1 to the excavation hole 93 formed by excavation work, the hole wall can be prevented from collapsing when the excavator 1 is pulled up.

  In this embodiment, the excavation bit member 2 provided with six bits 41 and 42 in total is used, but the number is not particularly limited. In this embodiment, the diameter of the excavation bit member 2 is, for example, 450 to 700 mm.

  Unlike the present embodiment, for example, when the drill bit member 2 is configured by providing five bits (one location in the axial center and four locations around it), the diameter of the drill bit member 2 is, for example, 450 mm or less. It can be. Furthermore, for example, when the excavation bit member 2 is configured by providing six to seven bits (one at the axial center and five or six around the bit), the diameter of the excavation bit member 2 is, for example, 700 mm or more. be able to.

  Further, the excavator 1 includes the air reservoir 30 inside the air tank member 3, but the air reservoir 30 may be provided outside the excavator 1 (for example, inside the kelly rod 7). When the air storage part 30 is provided in the kelly rod 7, the distal ends of the air hoses 351 and 352 may be connected from the excavator 1 to the air storage part 30 in the kelly rod 7. Instead of the screw shaft 7, a kelly rod having a supply path such as an air supply pipe and a soil reinforcing material can also be used.

FIG. 7 is a longitudinal sectional view illustrating a second embodiment of the excavator according to the present invention.
In addition, the same code | symbol is attached | subjected and shown to the same or equivalent location as Example 1. FIG. Moreover, about the location demonstrated in Example 1, description is abbreviate | omitted and difference is mainly demonstrated. This also applies to the third and later embodiments described later.

  In the excavator 1a according to the present embodiment, unlike the first embodiment (see FIG. 2), the shapes of the air hoses 352a and 353a provided in the air tank member 3 are different. For convenience of illustration, not all air hoses are shown in FIG. 7, but the same number of air hoses as the piston case 22 (five in this embodiment) are provided.

  In other words, in the first embodiment, the length of the air hoses 351 and 352 is changed to cause a deviation in the arrival time of the air introduced from the air reservoir 30 to the piston case 22. While using the air hoses 352a and 353a, the air arrival time is changed by changing the shape thereof. Other operations and effects are the same as or substantially the same as those of the first embodiment, and thus the description thereof is omitted.

FIG. 8 is a longitudinal sectional explanatory view showing a third embodiment of the excavator according to the present invention,
FIG. 9 is an explanatory perspective view showing the air flow control member 8 that controls the air flow direction arranged in the air storage section 30 of the excavator shown in FIG. 8.

  In the excavator 1b according to the present embodiment, unlike the first embodiment (see FIG. 2), the partition body and the air hose are not provided inside the air tank member 3. Instead, the air flow control member 8 that controls the flow direction of the air supplied from the connection joint 34 in the air storage portion 30 is fixed to the upper surface portion of the connection body 33.

  As shown in FIG. 9, the air flow control member 8 has a shape like a bowl. Specifically, the air flow control member 8 includes a ball-shaped receiving portion 81 that receives air directly from the outlet 340 of the connection joint 34 and a substantially conical support 82 that supports the receiving portion 81. The supporting body 82 is provided with a required number (in this embodiment, a plurality of, four locations) of circulation holes 821 through which air passes. The air flow control member 8 is disposed so that the axial center of the support 82 is positioned above the flow hole 331 of the central piston case 22.

  With the above-described configuration, the air supplied from the connection joint 34 hits the receiving portion 81 of the air flow control member 8 and rebounds and swirls within the air storage portion 30. A part of the air is introduced into the piston case 22 from the central flow hole 331 through the flow hole 821 of the support 82 of the air flow control member 8. Further, the remaining air passes through the side of the air flow control member 8 and is introduced into the piston case 22 from a flow hole 331 provided near the outer periphery.

  Thus, by changing the flow of air in the air reservoir 30, the arrival time of air introduced from the air reservoir 30 to the piston case 22 can be changed.

  As shown in FIG. 9, in this embodiment, a flow pipe 372 (shown by a two-dot chain line) disposed in the air storage unit 30 is provided so as to penetrate the air flow control member 8. Specifically, a through hole 811 provided in the ball-shaped receiving portion 81 and a through hole 822 provided in two places on the substantially conical support 82 (in FIG. 9, one of the through holes 822 is hidden and does not appear). Is provided so that the flow pipe 372 penetrates. Thereby, the flow of the soil reinforcing material or the like passing through the flow pipe 372 is not hindered by the air flow control member 8.

  The structure of the flow pipe 372 is not limited to that shown in FIGS. For example, it can be arranged along the inner wall of the air reservoir 30 so as not to disturb the air flow in the air reservoir 30 as much as possible.

As shown in FIG. 10, the shape of the receiving portion 81a of the air flow control member 8 can be flattened, or can be elliptical, rectangular or square, or other polygonal or irregular shape (irregular) Shape).
Other operations and effects are the same as or substantially the same as those of the first embodiment, and thus the description thereof is omitted.

FIG. 11 is a partial cross-sectional explanatory view showing a fourth embodiment of the excavator according to the present invention.
In addition, the same code | symbol is attached | subjected and shown to the same or equivalent location as Example 3. FIG. Further, the description of the portions described in the third embodiment is omitted, and differences are mainly described.

  In the excavation apparatus 1c according to the present embodiment, unlike the first embodiment (see FIG. 2), a spiral blade 38 is provided on the outer periphery of the air tank member 3. Thereby, the crushed bedrock and earth and sand (slime) which generate | occur | produce at the time of excavation can be sent to the ground surface more efficiently (it can be discharged | emitted).

  The spiral blade 38 can also be provided on the outer periphery of the excavation bit member 2. Needless to say, the spiral blade 38 can be provided in the excavating apparatuses 1 and 1a of the first and second embodiments. In addition, means for applying or supplying a soil reinforcement provided in each of the excavating devices 1, 1a, 1b, and 1c can be omitted.

  In the present specification, well-known or well-known conventional techniques are used for technical matters not described.

  The terms and expressions used in the present specification are merely explanatory and are not restrictive, and do not exclude terms and expressions equivalent to the above terms and expressions. The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the technical idea.

  Further, in the claims, the reference numerals used in the drawings are described in parentheses in order to facilitate understanding of the contents of the claims, but the claims are not limited to those described in the drawings. Absent.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which showed 1st Example of the excavation apparatus which concerns on this invention, and looked at the excavation apparatus 1 from the bottom perspective direction. Explanatory drawing of the longitudinal cross-section of the excavation apparatus 1 shown in FIG. The partial explanatory view by the side of the base of excavation equipment which looked at excavation equipment 1 shown in Drawing 2 from the plane direction. Exploded perspective view of the excavator 1 shown in FIG. The side view explanatory drawing which shows the rotary excavator 6 mainly comprised by the excavation apparatus 1 and the rotational drive apparatus 5 which were shown in FIG. The figure for demonstrating the underground excavation construction method using the excavation apparatus 1 shown in FIG. The longitudinal section explanatory view showing the 2nd example of the excavation equipment concerning the present invention. Longitudinal cross-sectional explanatory view showing a third embodiment of the excavator according to the present invention. FIG. 9 is a perspective explanatory view showing an air flow control member 8 that controls the air flow direction arranged in the air storage section 30 of the excavator shown in FIG. The perspective explanatory view showing other examples of the air distribution control member. The partial cross section explanatory drawing which shows the 4th Example of the excavation apparatus which concerns on this invention.

Explanation of symbols

1, 1a, 1b, 1c Excavator 2 Excavator bit member 3 Air tank member 5 Rotation drive device 6 Rotary excavator 7 Kelly rod 8, 9 Air flow control member 21 Connection body 22 Piston case 23 Piston case attachment body 24 Drive chuck 25 Chuck guide 26 Flat bar 30 Air storage portion 31 Nut 32 Bolt 33 Connection body 34 Connection joint 36 Flat bar 41, 42 Bit 50 Rotation drive device main body
51 Drive bush 52 Outrigger 71 Support shaft 72 Supply pipe 73 Wire 81 Receiving portion 82 Support body 91 Rotating body 92 Shaft body 92 Shaft portion 211 Hole 222 Insertion portion 223 Ring 223 Insertion portion 230 Sand 231 Cylindrical main body 232 Piston case casing 233, 234 Cover body 235, 236 Insertion hole 237 Bolt hole 241 Hole 242 Anti-rotation part 251 Bolt 252 Nut 253 Recess 254 Recess 255 Mounting hole 256 Recess 261 First flow hole 262 Flow pipe 263 Second flow hole 264 Third flow hole 31 Flowing hole 311 Bolt hole 34 Connection joint 340 Outlet 341 Partition 342 Connection hole 351, 352 Air hose 37 Flowing hole 371 First flow hole 372 Flowing pipe 373 Second flow hole 38 Spiral blades 411, 421 Head part 412 Button tip 44 Outlet 4 Off valve 451 shaft portion 600 Temporary scaffold 7 screw shaft 71 Tsushitajiku 811 through hole 822 through hole 821 flow holes 911 sail body 921 communicating hole 93 drilled hole 94 soil reinforcement 95 Katayuizai

Claims (9)

An excavation device for underground excavation provided with bits (41, 42) for performing excavation by advancing and retreating to the excavation side of the excavation device main body (2) when a striking force is given by the energy of the working fluid,
The bits (41, 42) are smaller than the excavator body (2) and are provided in a plurality, and the bits (41, 42) are configured to be driven to strike each other at different times.
It is characterized by comprising means for applying or supplying a soil reinforcing material and / or a consolidated material to the underground void (93) generated by excavation by the bit (41, 42),
Drilling rig. It is equipped with a bit (41, 42) that advances and retreats to the excavation side of the excavator body (2) when a striking force is given by the energy of the working fluid, and has a supply path for soil reinforcing material and / or consolidated material A drilling device for underground excavation that can be used by connecting to the front side of the shaft member (7) provided,
The bits (41, 42) are smaller than the excavator body (2) and are provided in a plurality, and the bits (41, 42) are configured to be driven to strike each other at different times.
Means for applying or supplying a soil reinforcing material and / or a consolidation material to the underground void (93) generated by excavation by the bit (41, 42),
The means for applying or supplying the soil reinforcement or / and the consolidation agent is:
The soil reinforcement or / and consolidation material outlet (94,94) provided on the excavation side of the excavator body (2);
A soil reinforcing material and / or a caking material flow path communicating the discharge port (94, 94) and the supply path of the shaft member (7);
It is characterized by having
Drilling rig. It has a spiral blade (38) on the outer periphery,
The excavation apparatus according to claim 1 or 2. A bit (41, 42) is provided on the excavation side, and includes a piston case (22) containing a piston that gives impact force to the bit (41, 42) by the energy of the working fluid,
A plurality of piston cases (22) are accommodated in the excavator body (2) corresponding to the number of the bits (41, 42),
The excavation apparatus according to any one of claims 1 to 3. The excavator body (2) is provided with a vibration-proof material and / or a sound-proof material (230) so as to surround the piston case (22),
Drilling apparatus according to claim 4. A shaft member (7) having a supply path for soil reinforcing material and / or consolidated material;
The excavator (1) according to any one of claims 1 to 5, wherein the excavator (1) is connected to the front side of the shaft member (7) and receives supply of soil reinforcing material and / or consolidated material from the supply path. ) (1a) (1b) (1c)
It is characterized by having,
Excavator provided with a shaft member. An excavation device for underground excavation provided with bits (41, 42) for performing excavation by advancing and retreating to the excavation side of the excavation device main body (2) when a striking force is given by the energy of the working fluid,
A spiral blade (38) is provided on the outer periphery of the drilling rig, and a plurality of bits (41, 42) are provided smaller than the drilling rig body (2), and the bits (41, 42) are connected to each other in time. It is configured to drive by striking the ball,
Drilling rig. The excavator (1) (1a) (1b) (1c) according to any one of claims 1 to 6 and the excavator (1) (1a) (1b) (1c) can be given rotational motion. A rotary drive device (5),
Rotary excavator. An underground excavation method using the excavator (1) (1a) (1b) (1c) according to any one of claims 1 to 6,
At the time of excavation work by the excavator (1) (1a) (1b) (1c) and / or when the excavator is lifted after excavation work, the excavator (1) ( 1a) (1b) (1c) is characterized in that it prevents the collapse of the hole wall by applying or supplying a soil reinforcing material (94) and / and a consolidation material (95),
Underground excavation method.

Images