JP2011026955A - Earth excavating hammer and rotary excavator with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earth excavating hammer wherein a hammer body consisting of an excavating part and an air tank is shared by attaching an attachment on a peripheral portion of the air tank, so as to exerts more suitable earth removing function in accordance to the quality of the ground to be excavated. <P>SOLUTION: The earth excavating hammer (1) includes: the hammer body (10) having the excavating part (2) and the air tank (3) mounted on a proximal side thereof; and the required number of attachments (4) which are detachable from the air tank part (3). The excavating part (2) has hammer bits (27, 28) at a distal end thereof, which makes forward and backward movements when driven by working fluid, to excavate the ground. One of the attachments (4) has a spiral blade (43) on a peripheral portion thereof. The other attachment replaceable with the attachment (4) has the required number of flat bars axially arranged on the peripheral portion. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an underground excavation hammer and a rotary excavator provided with the same.
More specifically, in an underground excavation hammer having an excavation part having a hammer bit at the tip and an air tank part provided on the base side of the excavation part, the hammer main body composed of the excavation part and the air tank part is shared, and the air tank The present invention relates to an underground excavation hammer capable of providing a more suitable soil removal function in accordance with the quality of the ground to be excavated on the outer peripheral portion of the unit, and a rotary excavator provided with the same.

In the field of civil engineering and architecture, underground excavation hammers called down-the-hole hammers are mainly used for excavation of hard ground containing rocks, boulders, concrete blocks, and the like.
The underground excavation hammer supplies compressed air from the outside and drives an internal piston to advance and retract the hammer bit at the tip, and excavates by the striking force.
As such an underground excavation hammer, there exists a thing of patent document 1 which this inventor proposed previously, for example.

  In Patent Document 1, in an underground excavation hammer (excavation apparatus in Patent Document 1), an air tank portion (also in the same manner) is provided on the base side of a drilling portion (also a drilling hammer bit member) having a plurality of hammer bits at the tip. There are disclosed an air tank member) provided with flat bars at equal intervals in the axial circumferential direction (also see FIG. 1) and one provided with screws (also see FIG. 11).

These so-called flat bar type and screw type underground excavation hammers have respective characteristics in the soil removal function (or soil removal performance) and the soil excavation function.
That is, in the flat bar type underground excavation hammer, the slime formed by crushing the rocks etc. with the hammer bit is further finely crushed by the flat bar in the air tank after passing through the outer periphery of the excavation part. Smoothly sent to the shaft screw. Therefore, the flat bar type is suitable for the case where the ground quality is a lot of rock or the like and these continue deeply.

  Further, in the screw type underground excavation hammer, the slime formed by crushing the bedrock or the like with the hammer bit passes through the outer peripheral part of the excavation part and is immediately sent upward by the screw of the air tank part. Therefore, even if the slime contains a lot of soil and clay, and the viscosity is relatively high, the slime does not adhere firmly so as to cling to the outer periphery of the air tank, and the soil cannot be drained smoothly. Can be prevented. For this reason, the screw type is suitable when the quality of the ground is not so much, such as rock mass, and there are a lot of soil and clay.

  Even in actual use, these flat bar type and screw type underground excavation hammers are prepared separately in advance. And according to the quality of the ground to be excavated, these are replaced with cranes and used properly.

JP2007-146446A

However, as described above, the conventional underground excavation hammer, which is divided into a flat bar type and a screw type, and used according to the quality of the ground to be excavated, has the following problems. It was.
That is, in order to prepare different types of underground excavation hammers as described above, a large space for management and storage is required, and space-efficient management and storage in a narrow place is difficult. When preparing different types of underground excavation hammers at the construction site for excavation work, the underground excavation hammer is relatively large, so it is used for underground excavation placed on the ground when not in use. Hammer could get in the way and interfere with work. For the same reason, there was a problem in terms of work safety.

(Object of the present invention)
SUMMARY OF THE INVENTION An object of the present invention is to provide an underground excavation hammer having an excavation part having a hammer bit at the tip and an air tank part provided on the base side of the excavation part. Underground excavation hammer that can provide more suitable soil removal function and excavation function according to the quality of the ground to be excavated, and rotation with the same Is to provide an excavator.

Means taken by the present invention to achieve the above object are as follows.
The present invention
Underground excavation hammer equipped with a hammer bit (27, 28) that moves forward and backward by being driven by a working fluid and excavates the ground,
Excavator (2) provided with a hammer bit (27, 28) at the tip and a hammer body (10) provided with an air tank (3) provided on the base side of the excavator (2),
The required number of attachments that are removably attached to the air tank (3) of the hammer body (10),
With
The required number of attachments is an underground excavation hammer including an attachment (4a) having a required number of engagement bars (45) provided in the axial circumferential direction on the outer peripheral portion.

The present invention
Underground excavation hammer equipped with a hammer bit (27, 28) that moves forward and backward by being driven by a working fluid and excavates the ground,
Excavator (2) provided with a hammer bit (27, 28) at the tip and a hammer body (10) provided with an air tank (3) provided on the base side of the excavator (2),
The required number of attachments detachably attached to the air tank (3) of the hammer body (10),
With
The required number of attachments is an underground excavation hammer including an attachment (4) provided with a spiral blade (43) on the outer peripheral portion.

The present invention
Underground excavation hammer equipped with a hammer bit (27, 28) that moves forward and backward by being driven by a working fluid and excavates the ground,
A hammer body (10) having an excavation part (2) provided with a hammer bit (27, 28) at the tip and an air tank part (3) provided on the base side of the excavation part (2);
The required number of attachments detachably attached to the air tank (3) of the hammer body (10),
With
The required number of attachments includes an attachment (4) provided with a spiral blade (43) on the outer peripheral portion, and an attachment (4a) provided with a required number of engagement bars (45) on the outer peripheral portion in the axial circumferential direction. The attachment is an underground excavation hammer that is selectively attached to the air tank portion (3) for use.

The underground excavation hammer of the present invention is
In the spiral blade (43) of the attachment (4) having the spiral blade (43) on the outer peripheral portion, the drive bush (51) of the rotary drive device (5) is parallel to the axial direction of the attachment (4). It is preferable to provide an engagement notch (44) that engages with an engagement strip (510) provided on the periphery.

The underground excavation hammer of the present invention is
At the base end of the air tank (3), there is a connecting joint (34) with a polygonal cross section for connecting the connecting shafts (7, 7a) for earth removal. The attachment (4, 4a) is inserted into the base end through the connecting joint (34) so that the attachment (4, 4a) and the air tank (3) can rotate together in the axial direction. It is preferably formed in a cylindrical body provided with a polygonal joint hole (41).

The present invention
Underground excavation hammer equipped with a hammer bit (27, 28) that moves forward and backward by being driven by a working fluid and excavates the ground,
A drilling section (2a) having a hammer bit (27, 28) at the tip;
An attachment (4b) removably attached to the base side of the excavation part (2a) and provided with a spiral blade (43a) on the outer peripheral part of the air tank part (3a);
An attachment (4c) that is detachably attached to the base side of the excavation part (2a) and has a required number of engagement bars (45a) provided in the axial direction in the outer peripheral part of the air tank part (3a), This is an underground excavation hammer.

The underground excavation hammer of the present invention is
In the spiral blade (43a) of the attachment (4b) having the spiral blade (43a) provided on the outer peripheral portion, in the drive bush (51) of the rotary drive device (5) in parallel with the axial direction of the attachment (4b) It is preferable that an engagement notch (44a) that engages with an engagement strip (510) provided on the periphery is provided.

The present invention
The underground excavation hammer and the underground excavation hammer (1, 1a) according to any of the above inventions are lowered by their own weight, and the underground excavation hammer (1, 1a) is subjected to rotational force in the axial direction. And a rotary excavator (5).

The present invention
The underground excavation hammer and the underground excavation hammer (1, 1a) according to any of the above inventions are lowered by their own weight, and the underground excavation hammer (1, 1a) is rotated in the axial direction. A rotary drive device (5) having a drive bush (51) that can be provided, and
On the inner periphery of the drive bush (51), the required number of engagements with the engagement notches (44, 44a) provided on the spiral blades (43, 43a) of the attachment (4, 4b, 4c) are provided. The rotary excavator has a required number of engagement grooves (519) to be engaged with the ligament portion (510) or the bar (45) of the attachment (4a).

(Function)
The operation of the underground excavation hammer and rotary excavator according to the present invention will be described. Here, the constituent elements used in the description are assigned in correspondence with the reference numerals given to the respective parts in the embodiments described later. These reference numerals are the same as the reference numerals described in the claims of the claims. Similarly, it is only for the purpose of facilitating understanding of the contents, and the meaning of each component is not limited to the above-described parts.

First, if the quality of the ground to be excavated is, for example, not much rock or the like and there is a lot of soil or clay, select the attachment (4) with spiral blades (43) and attach it to the air tank part (3) .
The underground excavation hammer (1) equipped with the attachment (4) is placed in a vertical position with the hammer bits (27, 28) down at the excavation position on the surface of the ground.

Lift the rotary drive (5), and insert the drive bush (51) into the attachment (4) attached to the air tank (3) of the underground excavation hammer (1). Pass the drive bush (51) and install the rotary drive (5) on the ground.
When using the attachment (4) provided with the spiral blade (43) on the outer periphery, the engagement notch (44) of the spiral blade (43) is connected to the inner periphery of the drive bush (51). The provided engaging strip (510) is engaged. When the attachment (4a) is used, the bar (45) is engaged with the engagement groove (519) on the inner peripheral portion of the drive bush (51a).

Further, a required number of earthing connecting shafts (7, 7a) are connected to the base end of the air tank (3). An engagement notch (76) similar to the spiral blade (43) of the attachment (4) is also provided on the spiral blade (75) of the earthing connecting shaft (7). A bar (78) is also provided on the connecting shaft (7a) for earth removal.
The earthing connecting shaft (7, 7a) has an engagement notch (76) or bar (78) that fits the engagement strip (510) or engagement groove (519) of the drive bush (51, 51a). That is, it is connected so that the position in the axial direction is the same as the engagement notch (44) of the spiral blade (43) of the attachment (4) or the bar (45) of the attachment (4a).

  Air is sent to the underground excavation hammer (1), and the hammer bits (27, 28) at the tip of the excavation part are moved forward and backward. Further, the drive bush (51) of the rotation drive device (5) is driven to rotate the underground excavation hammer (1) and the earthing connecting shaft (7, 7a) as a unit. As a result, the underground excavation hammer (1) excavates the ground in the vertical direction with the weight of the underground excavation hammer (1) and the earthing connection shaft (7, 7a). The slime that is crushed by the hammer bit (27, 28) is first sent upward by the spiral blade (43) in the case of the attachment (4), and further upward by the spiral blade (76) of the screw shaft (7). Sent to and discharged. In the case of the attachment (4a), the soil is discharged by using the pressure of air discharged from the tip of the underground excavation hammer (1) into the excavation hole.

  In this way, the hammer body (10) consisting of the excavation part (2) and air tank part (3) is shared, and the air tank part (3) has different soil removal functions according to the quality of the ground to be excavated. By attaching an attachment appropriately selected from the attachments (4, 4a), a more suitable soil removal function can be provided.

  In addition, the attachment (4b) in which the spiral blade (43a) is provided on the outer peripheral portion of the air tank portion (3a), and the required number of bars (45a) are provided in the axial circumferential direction on the outer peripheral portion of the air tank portion (3a). The underground excavation hammer (1a) including the attachment (4c) is different from the underground excavation hammer (1) in that the entire air tank (3a) is replaced. Therefore, explanation is omitted.

The present invention is a ground excavation hammer having a drilling portion having a hammer bit at the tip and an air tank portion provided on the base side of the drilling portion. In addition, by attaching an attachment appropriately selected from the attachments with different soil removal functions and excavation functions according to the quality of the ground to be excavated in the air tank part, more suitable soil removal for underground excavation hammers Functions and excavation functions can be added.
In this way, even when preparing different types of underground excavation hammers by sharing a hammer body or excavation part consisting of an excavation part and an air tank part, it is possible to manage and store space efficiently in a small place. This will be possible and will contribute to cost reduction. Also, when preparing different types of underground excavation hammers at the construction site for excavation work, the attachment is relatively small, and even if it is placed on the ground when not in use, it will not interfere so much. This is preferable from the viewpoint of work safety.

The perspective explanatory view which showed the embodiment of the underground excavation hammer which concerns on this invention, and was seen from the front part direction which is an excavation side. The exploded front view explanatory drawing of the hammer for underground excavation. The longitudinal cross-sectional view of the hammer for underground excavation. Exploded perspective view of the underground excavation hammer (disassembled excavation part removed from the air tank part). The perspective explanatory drawing which shows the air distribution control member which controls the flow direction of the air arrange | positioned at the air storage part of the underground excavation hammer. The exploded front view explanatory drawing which shows the other usage pattern of the underground excavation hammer which concerns on this invention. The front view explanatory drawing which carried out the cross section which shows the rotary excavator comprised with the underground excavation hammer and rotation drive device which attached the screw type attachment. FIG. 8 is an explanatory plan view showing the relationship between the underground excavation hammer of FIG. 7 and a rotary drive device. Explanatory drawing of the underground excavation construction method using the underground excavation hammer of FIG. The front view explanatory drawing which carried out the cross section which shows the rotary excavator comprised with the underground excavation hammer and rotation drive device which attached the flat bar type attachment. Plane view explanatory drawing which shows the relationship between the underground excavation hammer of FIG. 10, and a rotation drive device. The exploded front explanatory drawing in the case of combining the excavation part and the screw air tank part, showing other embodiments of the underground excavation hammer according to the present invention. The longitudinal cross-sectional view of the underground excavation hammer formed combining the excavation part and the screw air tank part. The exploded front explanatory view in the case of combining the excavation part and the flat bar air tank part, showing other embodiments of the underground excavation hammer according to the present invention.

The present invention will be described in more detail based on the embodiments shown in the drawings.
1 to 6 are views for explaining an embodiment of an underground excavation hammer according to the present invention.
FIG. 1 is a perspective explanatory view of the underground excavation hammer as seen from the direction of the tip portion on the excavation side
2 is an exploded front view explanatory view of the underground excavation hammer,
Fig. 3 is a longitudinal sectional view of an underground excavation hammer.
FIG. 4 is an exploded perspective view of the underground excavation hammer (disassembled excavation part removed from the air tank part),
FIG. 5 is a perspective explanatory view showing an air flow control member for controlling the air flow direction arranged in the air storage part of the underground excavation hammer;
FIG. 6 is an exploded front view explanatory view showing another usage pattern of the underground excavation hammer according to the present invention.
In FIG. 4, a part of the base side of the air tank portion shown in the upper part of the drawing is omitted.

  As shown in FIG. 7, which will be described later, the underground excavation hammer 1 is capable of lowering the underground excavation hammer 1 by its own weight and applying a rotational force to the underground excavation hammer 1 in the axial circumferential direction. The rotary excavator 6 is configured and used in combination with the drive device 5.

(Underground Hammer 1)
The structure of the underground excavation hammer 1 will be described mainly with reference to FIGS.
The underground excavation hammer 1 is formed in a substantially cylindrical shape as a whole. The underground excavation hammer 1 is detachably attached to a hammer main body 10 and an air tank unit 3 including an excavation unit 2 positioned on the excavation side (front side) and an air tank unit 3 positioned on the base side opposite to the excavation side. An attachment 4 is provided.

  The air tank part 3 is detachably connected to the base part side of the excavation part 2 by means of bolts 32 and nuts 31 (see FIG. 4) which are fixing tools. Specifically, the required number of bolts 32 as fixing tools are fixed to the joint surface side of the base end side of the excavation part 2. And the air tank part 3 and the excavation part 2 are connected by passing the volt | bolt 32 of the excavation part 2 through the bolt hole 311 of the air tank part 3, and fastening with the nut 31 and fixing.

  The excavation part 2 includes a plurality of hammer bits 27 and 28 on the tip side. The hammer bits 27 and 28 perform excavation by advancing and retreating to the excavation side of the hammer main body 2 when a striking force is given by energy of air (compressed air) that is a working fluid. As the working fluid, in addition to air, other gases and liquids such as water and oil can be employed.

The hammer bit 27 is provided at one place in the center (axial center) of the bottom of the excavation part 2. Moreover, the hammer bit 28 is provided in five places at equal intervals in the axial circumferential direction of the bottom part of the excavation part 2 centering on the hammer bit 27 (refer FIG. 1).
In the present embodiment, six hammer bits 27 and 28 are provided in total, but the number is not particularly limited. Moreover, although the diameter of the excavation part 2 is set to 450-700 mm, for example, it is not limited to this.

  The hammer bits 27 and each of the hammer bits 28 advance and retreat at a high speed (for example, 1200 to 1300 times per minute per hammer bit, 7200 to 7800 times per minute as a whole). The ground can be excavated by moving (striking vibration). The forward / backward stroke of each hammer bit 27, 28 is, for example, about 10 to 30 mm, but is not limited to this. Note that air, which is a working fluid that drives the hammer bits 27, 28, can be stored in a high pressure state in the air storage unit 30 of the air tank unit 3.

  The underground excavation hammer 1 includes means for supplying a soil reinforcing material or a solidified substance (hereinafter referred to as “soil reinforcing material”) to an underground void formed by underground excavation by the hammer bits 27 and 28. Yes. As shown in FIG. 7, the underground excavation hammer 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 for a soil reinforcing material or the like. As the shaft member, a kelly rod or the like can be employed in addition to the screw shaft. The screw shaft 7 will be described later.

  As shown in FIG. 2, the means for supplying soil reinforcing material and the like includes a discharge port 265 for discharging the soil reinforcing material and the like provided on the hammer bits 27 and 28 side (excavation side) of the excavation part 2, and this exhaust. An internal flow path that is a flow path of a soil reinforcing material or the like that communicates the outlet 265 and the supply path of the screw shaft 7 is provided. Details of the internal flow path will be described later.

  The soil reinforcing material or the like is supplied from the screw shaft 7 shown in FIG. Furthermore, it flows through the internal flow path of the underground excavation hammer 1, and finally the on-off valve 29 (see FIG. 3) is opened by pressure, so that it is discharged out of the underground excavation hammer 1 from the discharge port 265. . As shown in FIG. 1, a required number (a plurality, two in the present embodiment) of discharge ports 265 are provided at required positions between the respective hammer bits 28 on the tip surface of the chuck guide 25 described later. .

  As shown in FIG. 3, the on-off valve 29 that opens and closes each discharge port 265 is disposed at one end of the internal flow path, and has a structure that opens and closes around the shaft portion 290. A number of cemented carbide button tips 291 are provided on the surface of the on-off valve 29. The on-off valve 29 is rotated and opened when a predetermined pressure such as a soil reinforcing material is applied to the internal flow path of the excavation unit 2.

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

(Excavation part 2)
As shown in FIG. 4, the excavation unit 2 includes, in order from the top, a piston case 22 that includes a connecting body 21 and that houses a driving means including a piston, a piston case mounting body 23, a drive chuck 24, a chuck guide 25, Hammer bits 27 and 28 are provided.

  The piston case 22 is made of metal and has a substantially cylindrical shape. A connecting body 21 is screwed to the base end portion (upper end portion in FIG. 4) of the piston case 22. Hammer bits 27 and 28 are connected to the tip end portion (lower end portion in FIG. 4) of the piston case 22 via a drive chuck 24 and a chuck guide 25. The piston case 22 is provided in the same number as the hammer bits 27 and 28 (in the present embodiment, a plurality of and six locations).

  The piston case 22 accommodates drive means (not shown) including a piston for operating the hammer bits 27 and 28. The driving means is a known down-the-hole hammer driving mechanism such as a cylinder, check valve, air distributor, valve spring, make-up ring, O-ring, piston retainer ring, hammer bit retainer ring, etc. No. 92288) can be employed.

  The operation of the driving means will be briefly described. The air introduced into the piston case 22 moves to the lower side of the piston to push up the piston. Then, as the piston rises, the air moves to the upper side of the piston. Press down. By repeating this operation, the piston moves up and down to give an impact force to the hammer bits 27 and 28 on the excavation side.

  The connection body 21 located at the base end portion of the piston case 22 has a hole 211 (not shown in FIG. 4; see FIG. 8 described later) as a working fluid path, and the base end side is formed in a convex section. Yes. The convex portion constitutes the insertion portion 222, and the insertion portion 222 is inserted into the air tank portion 3 and attached. And the drive means in piston case 22 drives with the air sent via the insertion part 222 of the connection body 21 from the air tank part 3. FIG. A required number (in the present embodiment, a plurality) of O-rings 223 are provided in the axial direction of the insertion portion 222 so that the airtightness of the air sent from the air tank portion 3 can be maintained.

  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 is mainly formed in a cylindrical main body 231, a front cover body 233 fixed to the opening on the front side of the cylindrical main body 231, and an opening on the base side of the cylindrical main body 231. The base cover body 234 is fixed.

  Furthermore, a piston case casing 232 (see FIG. 4), 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 thereof is 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 the present embodiment, the insertion holes 235 and 236 are arranged at one place in the center and five places at equal intervals on the circumference centering on the center, for a total of six places.

  As shown in FIG. 2, the 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.

  Furthermore, sand 230 (see FIG. 3) is filled in the underground gap formed between the piston cases 22 and 22 in the piston case mounting body 23 (cylindrical main body 231) as a vibration-proof material or a sound-proof material. ing. 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 the proximal end side is slightly pushed in. In the hole 241 on the distal end side of the drive chuck 24, the base side of the hammer bits 27 and 28 is accommodated through the chuck guide 25 so as to be able to 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 the present embodiment, five bolts 251 are provided at equal intervals on the base side of the chuck guide 25. 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 circular concave portion 253 in the bottom view and a concave portion 254 that is a V-shaped groove in the bottom view are provided radially so as to surround the concave portion 253. In the recess 253, the hammer bit 27 provided with a head portion 270 having a circular shape in a bottom view is disposed. In the concave portion 254, the hammer bit 28 provided with a head portion 280 having a triangular shape in a bottom view is disposed. A number of cemented carbide button tips 200 are provided on the head portions 270 and 280 of the hammer bits 27 and 28.

  The chuck guide 25 is provided with an attachment hole 255 which is an attachment portion made up of the same number of holes as the hammer bits 27 and 28. The attachment hole 255 is located in the recess 253 and the recess 254. The distal end portion of the drive chuck 24 is fitted on the base side of the mounting hole 255. The drive chuck 24 has a hexagonal nut-shaped detent 242, and a hexagonal recess 256 (see FIG. 3) into which the detent 242 is fitted is formed in the mounting hole 255 of the chuck guide 25.

  The base side of the hammer bits 27 and 28 is formed as a spline shaft, and the base side is fitted from the front end of the mounting hole 255 to thereby form a concave and convex engaging groove (not shown) on the inner peripheral wall. 24 is mounted inside. The base side of the hammer bits 27 and 28 is mounted so as not to be detached from the drive chuck 24 side by the hammer bit retainer ring and the O-ring.

  Further, as shown in FIG. 1, a required number of flat bars 26 are provided on the outer peripheral portion of the piston case attachment body 23 along the axial direction. In this embodiment, the flat bar 26 has a substantially quadrangular cross section, and a plurality of (8 in this embodiment) flat bars 26 are provided at predetermined intervals in the axial circumferential direction. The slime generated in the hole excavated during the excavation work of the ground is excavated by the air injected from the front side of the excavation part 2 (for example, the air discharged to drive the hammer bits 27 and 28). It is sent out to the ground surface through the gap between the hole and the cylindrical main body 231 and discharged.

(Air tank part 3)
As shown in FIG. 4, a connecting body 33 for connecting to the base end portion of the excavation portion 2 (the insertion portion 222 above the piston case 22) is provided on the front portion side of the air tank portion 3. 2 is provided at the lower end portion of the outer peripheral surface of the air reservoir 30 in FIG. 2 so that the lower portion of the covered cylindrical cap body 40 of the attachment 4 to be fitted does not shake or rattle. It has been. The steady rest protrusions 39 are provided at four locations at equal intervals in the axial circumferential direction. In addition, the steadying means such as the steadying projection 39 may be provided on the inner peripheral surface of the cap body 40 without being provided on the outer peripheral surface of the air storage unit 30.

  A screw shaft 7 shown in FIG. 7 is connected to the base end portion (upper end portion in FIG. 3) of the air tank portion 3, and a cross-sectional regular hexagonal shape for introducing air and soil reinforcing material from the screw shaft 7 is used. A connection joint 34 is provided.

  Air flow paths 340 and 340 (see also FIG. 8) are arranged in parallel at the connection joint 34. Between the air circulation paths 340 and 340, the 1st circulation hole 371 which comprises some internal flow paths, such as a soil reinforcement, is provided. Further, on the outer surface of the connection joint 34, engagement grooves 341 are provided in a pair of surfaces parallel to each other. Each engagement groove 341 is provided in a direction perpendicular to the axial direction and parallel to each other. Each engagement groove 341 is fitted with a fixing pin 38 to be described later.

An air flow control member 8 that controls the flow direction of air supplied from the connection joint 34 is fixed to the upper surface portion of the connection body 33 in the air storage portion 30 of the air tank portion 3.
The air flow control member 8 has a shape like a bowl as shown in FIG. The air flow control member 8 includes a bowl-shaped receiving portion 81 that directly receives air from the air flow path 340 of the connection joint 34, and a substantially truncated cone-shaped (but hollow) support 82 that supports the receiving portion 81. Yes. The supporting body 82 is provided with a required number (in the present embodiment, a plurality of, four places) 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.

  Further, as shown in FIG. 5, in the present embodiment, a flow pipe 372 arranged 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 bowl-shaped receiving portion 81 and a through hole 822 provided in two places on the substantially truncated cone support 82 (one of the through holes 822 is hidden in FIG. 5). It is provided so that the flow pipe 372 penetrates (not shown). 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.

  Air introduced from the air flow path 340 of the connection joint 34 is stored in the air storage unit 30. Then, the air is sent to each piston case 22 connected to the coupling body 33 through an air circulation path constituted by the air storage portion 30 and a circulation hole 331 formed in the coupling body 33, and the piston case. The piston inside 22 is driven, and the hammer bits 27 and 28 at the tip are moved up and down. The flow hole 331 is connected to the hole 211 of the insertion part 222 of the piston case 22.

As shown in FIG. 2, the base portion side of the air tank portion 3 is formed so as to be slightly narrowed toward the base end portion with the connecting body 33 as a boundary and to have a small diameter.
An attachment 4 is detachably attached to the air tank 3. The attachment 4 is a screw type, is formed in an inverted bottomed cylindrical shape having an open front end side, and includes a cap body 40 that can be externally fitted to the air tank portion 3. A circular end plate 42 having a joint hole 41 at the center is fixed to the base end of the cap body 40. The joint hole 41 is formed in a regular hexagonal shape, and the attachment 4 and the air tank portion 3 can be integrally rotated in the axial circumferential direction by being fitted into the connection joint 34.

  A spiral blade 43 is provided on the outer peripheral surface of the cap body 40. The spiral direction of the spiral blade 43 is the same as the spiral blade 75 of the screw shaft 7 described later. The spiral blade 43 is provided with an engagement notch 44 that is engaged with an engagement strip 510 of the drive bush 51 of the rotary drive device 5 described later. As shown in FIG. 1, the engagement notches 44 are provided at four locations at equal intervals in the circumferential direction so as to partially cut out the spiral blades 43 from the outside, and at one pitch of the spiral blades 43 per one place. It has been.

  The attachment 4 is attached to the air tank unit 3 with the joint hole 41 fitted in the connection joint 34 and the end plate 42 placed on the base end surface 35 of the air tank unit 3. In addition, substantial fixation of the attachment 4 to the air tank part 3 is performed by connecting the screw shaft 7 mentioned later. This connection structure will be described later. When the attachment 4 is attached to the air tank unit 3, the air tank unit 3 is entirely covered with the attachment 4.

  Further, the outer diameter of the cap body 40 of the attachment 4 is formed to be slightly smaller than the diameter of the connecting body 33, and is larger than the inner diameter of a cylindrical drive bush 51 provided in the rotation drive device 5 (see FIG. 7) described later. It is formed to be slightly smaller in diameter.

  Then, with the underground excavation hammer 1 standing, the drive bush 51 is fitted from the base end (upper side) of the underground excavation hammer 1, and the engagement strip 510 of the drive bush 51 is connected to the spiral blade of the attachment 4. When the drive bushing 51 is dropped so as to be aligned with the engagement notch portion 44 provided in 41, the drive bush 51 stops at the portion of the air tank portion 3 where the diameter is large (near the coupling body 33) and does not fall down. Details of this operation will be described later. The explanation of the internal flow path for supplying the soil reinforcing material and the like will also be described later.

(Internal channel of underground excavation hammer 1)
Next, with reference mainly to FIG. 2, the internal flow path for supplying the soil reinforcing material and the like provided in the underground excavation hammer 1 will be described. Hereinafter, for convenience of explanation, the internal flow path provided in the air tank part 3 is referred to as a “first internal flow path”, and the internal flow path provided in the excavation part 2 is referred to as a “second internal flow path”. .

The first internal flow path provided in the air tank part 3 is mainly connected to the first flow hole 371 of the connection joint 34 and the flow pipe 372 connected to the first flow hole 371 and passing through the air storage part 30. And a second flow hole 373 provided through the coupling body 33.
A proximal end portion (upper end portion in FIG. 3) of the flow pipe 372 is inserted into the first 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 second flow holes 373 is not hidden in FIG. 3). is doing.

  On the other hand, the number of second internal flow paths provided in the excavation part 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 of them is hidden).

  The second internal channel mainly includes a first flow hole 261 provided through the base cover body 234 on the base side, a flow pipe 262 provided in the cylindrical main body 231, and a front cover body 233. And a third flow hole 264 provided so as to pass through the chuck guide 25. 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 265 that discharges the soil reinforcing material and the like.

  When the excavation part 2 is assembled, when the chuck guide 25 is connected to the tip cover body 233 of the piston case attachment body 23, the second circulation hole 263 and the third circulation hole 264 are communicated. And if the air tank part 3 and the excavation part 2 are connected, the 1st internal flow path and the 2nd internal flow path will connect, and the internal flow path which penetrates the excavation part 2 will be formed.

  With the above configuration, when 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 excavating part 2 and is excavated from the discharge ports 265 and 265 through the on-off valve 29. It is discharged out of the hammer 1.

With reference to FIG. 6, another usage pattern of the underground excavation hammer according to the present invention will be described.
In this usage form of the underground excavation hammer 1, the attachment 4 is detached from the underground excavation hammer 1 of the above-described form, and the attachment 4 a is attached to the air tank unit 3 by sharing the hammer body 10. The attachment 4a is fixed using a fixing tool and is detachable.

  The attachment 4a is a flat bar type, is formed in an inverted bottomed cylindrical shape having an open end, and includes a cap body 40a that can be externally fitted to the air tank portion 3. A circular end plate 42a having a joint hole 41a at the center is fixed to the base end of the cap body 40a. The joint hole 41a is formed in a regular hexagonal shape, and the attachment 4a and the air tank portion 3 can be integrally rotated in the axial circumferential direction by being fitted into the connecting joint 34.

  On the outer peripheral surface of the cap body 40a, there are flat bars 45, which are engaging bars that engage with the engaging grooves 519 of the drive bush 51, in the required number at equal intervals in the axial circumferential direction, and in four places in the present embodiment. Is provided. Each flat bar 45 is provided in parallel to the axial direction of the cap body 40a. The height of each flat bar 45 protruding outward is determined by the engagement strip 510 when the underground excavation hammer 1a is held through the cap body 40a on the drive bush 51 of the rotary drive device 5 described later. Is set to a height that can be engaged. Thereby, the rotational force of the drive bush 51 can be transmitted to the underground excavation hammer 1 a held by the drive bush 51.

  The flat bar 45 (the same applies to the flat bar 45a of the underground excavation hammer 1a to be described later) has the function of further breaking down the slime formed by the hammer bits 27 and 28 as described later in addition to the above action. Have. The shape of the flat bar 45 (and 45a) is not limited to the above-mentioned shape. For example, a bar having a suitable shape such as a round bar, a polygonal cross section other than a quadrangular cross section, or a bar or plate having an irregular cross section is used. can do.

(Work)
FIG. 7 is a front view explanatory view showing a part of a rotary excavator composed of an underground excavation hammer and a rotary drive device equipped with a screw type attachment,
FIG. 8 is a plan view explanatory view showing the relationship between the underground excavation hammer and the rotary drive device of FIG.
FIG. 9 is an explanatory view of the underground excavation method using the underground excavation hammer shown in FIG.
In FIG. 8, the screw shaft connected to the underground excavation hammer is omitted.

  The rotary excavator 6 includes a rotation driving device 5 to be described below, and an underground excavation hammer 1 and a screw shaft 7 which are rotationally driven by being supported or supported by the rotation driving device 5.

(Rotary drive device 5)
The rotation drive device 5 gives a rotational force to the underground excavation hammer 1. The rotary drive device 5 includes a device main body 50 and an outrigger 52 that supports the device main body 50.
The apparatus main body 50 includes a rotary table 53. The turntable 53 has an insertion hole 530 penetrating in the vertical direction, and a mounting step portion 531 having a slightly larger diameter is provided on the upper opening side.
The mounting step portion 531 is provided with locking holes 532 at a plurality of locations. The rotary table 53 is configured by a hydraulic motor, a gear device, or the like (for example, a structure in which a worm rotated by a hydraulic motor is engaged with a gear provided on an outer peripheral portion on the lower side of the rotary table 53). It is rotationally driven in the direction.

  A drive bush 51 is inserted into and attached to the insertion hole 530 of the rotary table 53. The drive bush 51 has a cylindrical main body 511. A flange portion 512 is provided over the entire circumference in the middle portion in the longitudinal direction of the outer peripheral portion of the main body 511. The collar portion 512 is formed in a size that can be fitted into the placement step portion 531 described above. A locking projection 513 is provided on the lower surface of the flange portion 512 at a position corresponding to the locking hole 532, and the drive bush 51 locks the locking projection 513 in the locking hole 532, It is placed on the placing step portion 531 and inserted through the insertion hole 530 of the rotary table 53.

On the inner surface of the main body 511, engagement strips 510 are provided at four locations at equal intervals in the circumferential direction.
Each engagement strip 510 is provided over the entire length in parallel to the axial direction of the drive bush 51, that is, in the longitudinal direction.
In addition, since the rotary drive device 5 employs a known technique, the description thereof is stopped as described above, and the details are omitted.

  With reference to FIG. 1 thru | or FIG. 9, the effect | action of the underground excavation hammer 1 and the rotary excavator 6 which attached the screw type attachment 4 is demonstrated. In this embodiment, a case where a hole for a foundation pile such as an H-shaped steel is excavated in the ground (ground) will be described as an example. The foundation pile 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. 7, in the rotary drive device 5 that constitutes the rotary excavator 6 together with the underground excavation hammer 1, an outrigger 52 is placed on a temporary scaffold 60 formed of, for example, H steel or concrete block. To be installed. On the other hand, the required number (required number) of screw shafts 7 is connected to the base end portion of the underground excavation hammer 1 according to the length of the hole excavated in the ground.
At this time, the engagement notch portion 76 provided in the spiral blade 75 of each screw shaft 7 has the same position in the axial direction as the engagement notch portion 44 provided in the spiral blade 41 of the attachment 4. (To pass along a straight line in the longitudinal direction).

  The screw shaft 7 is a connecting shaft for earth removal. After the attachment 4 is mounted on the air hammer portion 3 as described above, the connecting joint 34 is connected to the engaging portion (reference numeral omitted) at the lower end portion and placed on the attachment 4. Then, two fixing pins 38 are passed through pin holes (not shown in the figure) provided at two positions below the screw shaft 7, and the fixing pins 38 are respectively inserted into the engaging grooves 341 of the connection joint 34. Engage. Thereby, the screw shaft 7 does not come off from the air tank portion 3 of the underground excavation hammer 1.

  A plurality of other screw shafts 7 connected to the screw shaft 7 are also connected with a connection joint 77 formed in the same manner as the connection joint 34 and a fixing pin 38 in the same structure. In addition, the protrusion part which makes a contact area small can also be provided in the lower end part of the said attachment 4 or the lower end part of the screw shaft 7 so that backlash may not arise easily between the surfaces which each contact.

  Each screw shaft 7 incorporates a supply path such as an air supply pipe and a soil reinforcing material. The screw shaft 7 includes a spiral blade 75. The spiral blade 75 is provided with an engagement notch 76 that engages with a locking strip 510 provided on the inner wall of the drive bush 51 of the rotary drive device 5 at a required position. The underground excavation hammer 1 provided with the screw shaft 7 is suspended by a crane (not shown in the drawing). In FIG. 7, reference numeral 73 denotes a wire connected to the crane.

  The drive bush 51 is set on the rotary table 53 of the rotary drive device 5. Further, while the rotary drive device 5 is suspended by a crane, each engagement strip 510 provided on the inner surface of the drive bush 51 is provided on the spiral blade 43 of the attachment 4 of the underground excavation hammer 1. Engage with the notch 44. Then, the rotary drive device 5 is further lowered and placed on the ground via the temporary scaffold 60. Next, excavation is started while the underground excavation hammer 1 connected with the screw shaft 7 is suspended by a crane.

  At the time of excavation, the rotational driving force transmitted from the rotary table 53 to the drive bush 51 is further transmitted to the attachment 4 (and the air tank unit 3) via the spiral blade 43, and the underground excavation hammer 1 rotates. A suspension shaft 71 for suspension by a crane is provided at the upper end of the screw shaft 7. A first supply pipe 72 that is a supply pipe that supplies air to the underground excavation hammer 1 through the screw shaft 7 and a second supply pipe 74 that supplies soil reinforcement and the like are connected to the suspension shaft 71. ing. 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 underground excavation hammer 1 through the air supply pipe of the screw shaft 7. The air sent to the underground excavation hammer 1 is stored in the air storage unit 30 via the connection joint 34 shown in FIG. 3, and further, the air distribution control member 8 changes the arrival time of the air while each piston case 22. And the driving means such as a piston is driven to move the hammer bits 27 and 28 at the tip forward and backward.

As described above, since the time when the air is introduced into each piston case 22 is shifted as described above, the hammer bits 27 and 28 move forward and backward while shifting the time, and they hit the ground. Further, since the hammer bits 27 and 28 are small in diameter with respect to the hole to be excavated, the impact of the ground received every time the hammer bits 27 and 28 are hit is small.
Further, the rotary drive device 5 provides rotational movement to the underground excavation hammer 1, so that the excavation position of the hammer bit 28 included in the underground excavation hammer 1 moves relative to the excavation surface. Thereby, the hammer bits 27 and 28 can hit the entire excavation surface evenly.

  Excavation holes 93 (see FIG. 9) are formed by excavation by the hammer bits 27 and 28, and the underground excavation hammer 1 digs through the ground. As the excavation work further proceeds, when the screw shaft 7 shown in FIG. 7 descends to the position of the drive bush 51, the engagement notch 76 provided on the spiral blade 75 of the screw shaft 7 is formed on the inner surface of the drive bush 51. Engage with the provided engaging strip 510. Then, the rotational driving force transmitted from the rotary table 53 to the drive bush 51 is transmitted to the screw shaft 7 via the spiral blade 75.

Further, slime generated by hitting the hammer bits 27 and 28 during excavation can be smoothly sent to the ground surface through the spiral blades 43 of the attachment 4 and the spiral blades 75 of the screw shaft 7 and can be discharged.
As described above, the attachment 4 having the spiral blade 43 can send the slime upward through the spiral blade 43 immediately after passing through the outer peripheral portion of the excavation unit 2. Therefore, even if the slime contains a lot of soil and clay and the viscosity is relatively high, the slime does not adhere firmly so as to cling to the outer peripheral portion of the attachment 4, and the soil can be discharged smoothly.

  Further, as shown in FIG. 3, driving means such as pistons for operating the hammer bits 27 and 28 are accommodated in the piston case 22 and further covered with a cylindrical piston case casing 232, and further a vibration isolating material. Or it accommodates in the cylindrical main body 231 filled with the sand 230 which is a soundproof material. As a result, it is possible to prevent the sound and vibration generated during driving of the driving means from leaking or being transmitted to the outside, and to reduce vibration and noise.

  In the rotary excavator 6 according to the present embodiment, since the rotary drive device 5 includes the outrigger 52, the outrigger 52 not only improves the stability during excavation work, but also directly connects the apparatus main body 50 to the ground plane. The vibration transmitted from the apparatus main body 50 to the grounding surface is mitigated as compared with the case where excavation is carried out by mounting. Furthermore, since the underground excavation hammer 1 only needs to drive the small-diameter hammer bits 27 and 28 with respect to the excavation hole 93, the consumption of air for moving one hammer bit up and down is small. As a result, a relatively small air compressor can be used. Thereby, low vibration and low noise can be achieved more effectively.

  During excavation work by the underground excavation hammer 1, a soil reinforcing material such as bentonite is supplied to the screw shaft 7 from the second supply pipe 74 shown in FIG. 7. As a result, as shown in FIG. 9 (a), the underground excavation hammer 1 proceeds with excavation, and at the same time, the soil excavation from the discharge ports 265, 265 (see FIG. 1) on the excavation side of the underground excavation hammer 1 The material is discharged. As a result, the soil reinforcing material 94 is supplied to the peripheral wall portion of the excavation hole 93 which is an underground void portion generated by excavation by the hammer bits 27 and 28, and is constructed in layers.

  Next, after the excavation work is finished, the second supply pipe 74 is switched so that a cemented milk such as cement milk can be supplied. Then, when the underground excavation hammer 1 is lifted after the excavation work, by supplying a caking agent to the screw shaft 7, as shown in FIG. 9 (b), the outlet 265 of the underground excavation hammer 1; The consolidated material 95 is discharged from the H.265 through the on-off valves 29 and 29. Thereby, the consolidated material 95 is supplied to the bottom of the excavation hole 93 generated by excavation by the hammer bits 27 and 28. The supply amount of the consolidated material 95 is, for example, about 1/3 of the depth of the excavation hole 93, but is not limited thereto.

  Thereafter, the underground excavation hammer 1 is pulled up, a foundation pile such as H-shaped steel is inserted and rooted, and finally the excavation hole 93 is filled with earth and sand. In this way, by performing the construction of supplying the soil reinforcing material 94 and the consolidated material 95 from the underground excavation hammer 1 to the excavation hole 93 formed by excavation work, the hole when the underground excavation hammer 1 is pulled up is provided. Wall collapse can be prevented.

  When the excavation work is completed and the next excavation work 1 is performed using the same underground excavation hammer 1, for example, when the quality of the ground to be excavated is a lot of rock, etc. The attachment 4 a having the flat bar 45 is selected and attached to the air tank 3 of the hammer body 10.

FIG. 10 is a front view explanatory view showing a part of a rotary excavator composed of an underground excavation hammer and a rotary drive device equipped with a flat bar type attachment,
FIG. 11 is an explanatory plan view showing the relationship between the underground excavation hammer and the rotary drive device of FIG.
In FIG. 11, the flat bar shaft 7a connected to the underground excavation hammer is omitted.

The rotary excavator 6a includes a rotation driving device 5a, an underground excavation hammer 1 and a flat bar shaft 7a which are rotationally driven by being supported or supported by the rotation driving device 5a. The flat bar shaft 7a is a soil connection shaft.
The rotation drive device 5a includes a device main body 50a and an outrigger 52 that supports the device main body 50a. In this embodiment, in FIG. 10 and FIG. 11, the same parts as those of the rotary drive device 5 are denoted by the same reference numerals, and redundant description of the structure is basically omitted.

  The drive bush 51a of the apparatus main body 50a is provided with engagement grooves 519 at four locations on the inner surface of the main body 511 at equal intervals in the circumferential direction. Each engagement groove 519 is provided in parallel to the axial direction of the drive bush 51a, that is, over the entire length in the longitudinal direction. Each engagement groove 519 engages each flat bar 45 provided on the attachment 4 a mounted on the hammer body 10. In addition, each flat bar 78 of each flat bar shaft 7a connected to the underground excavation hammer 1 is similarly engaged with each engagement groove 519.

  The operation of the underground excavation hammer 1 and the rotary excavator 6a to which the flat bar attachment 4a is attached will be described with reference to FIGS.

The flat bar shaft 7 a is connected to the underground excavation hammer 1 so as not to come off, like the screw shaft 7. At this time, the flat bar 78 provided on the flat bar shaft 7a is aligned so that the position in the axial circumferential direction is the same as that of the flat bar 45 of the attachment 4a (so that it passes along a straight line in the longitudinal direction).
The drive bush 51a is set on the rotary table 53 of the rotary drive device 5a. Further, the engaging groove 519 provided on the inner surface of the drive bush 51a is engaged with the flat bar 45 of the attachment 4a of the underground excavation hammer 1 while the rotary drive device 5a is suspended by a crane. Then, the rotary drive device 5 a is further lowered and placed on the ground via the temporary scaffold 60. Next, excavation is started by rotating the underground excavation hammer 1 connected to the flat bar shaft 7a by a crane with the rotation drive device 5a while hanging down.

  Drilling holes are formed by excavation with the hammer bits 27 and 28, and the underground excavation hammer 1 digs through the ground. As the excavation work proceeds further, when the flat bar shaft 7a descends to the position of the drive bush 51a, the flat bar 78 of the flat bar shaft 7a engages with an engagement groove 519 provided on the inner surface of the drive bush 51a. . Then, the rotational driving force transmitted from the rotary table 53 to the drive bush 51 a is transmitted to the flat bar shaft 7 a via the flat bar 78.

By performing excavation work in the same manner as described above using the underground excavation hammer 1 equipped with the attachment 4a, the slime crushed by the hammer bits 27 and 28 passes through the outer peripheral portion of the excavation unit 2. After that, it is further crushed by each flat bar 45 of the attachment 4a.
In the case of the attachment 4a, the soil is discharged by using the pressure of air discharged from the tip of the underground excavation hammer 1 into the excavation hole.

  According to the combination of the underground excavation hammer 1 and the flat bar shaft 7a fitted with the flat bar type attachment 4a, the combination of the underground excavation hammer 1 and the screw shaft 7 fitted with the screw type attachment 4 and Compared to this, there is an advantage of excellent straightness when digging.

  Thus, according to the underground excavation hammer 1 of the present embodiment, the hammer main body 10 including the excavation part 2 and the air tank part 3 is shared, and the air tank part 3 is matched to the quality of the ground to be excavated. By attaching an attachment appropriately selected from the attachments 4 and 4a having different soil removal functions, a more suitable soil removal function can be provided.

FIG. 12 shows another embodiment of the underground excavation hammer according to the present invention, and is an exploded front explanatory view when the excavation part and the screw air tank part are combined.
FIG. 13 is a longitudinal sectional view of an underground excavation hammer formed by combining an excavation part and a screw air tank part;
FIG. 14 shows another embodiment of the underground excavation hammer according to the present invention, and is an exploded front explanatory view when the excavation part and the flat bar air tank part are combined.

  The underground excavation hammer 1a according to the present embodiment is detachable by an excavation part 2a having hammer bits 27 and 28 at the tip, and a bolt 32 and a nut 31 on the base side of the excavation part 2a, and the outer periphery of the air tank part 3a. Attachment 4b provided with spiral blades 43a in the part, and attachment 4c which can be similarly attached to and detached from the base side of the excavation part 2a, and flat bars 45a are provided at four locations in the axial circumferential direction on the outer peripheral part of the air tank part 3a. It has.

Similar to the spiral blade 43 of the attachment 4, the spiral blade 43 a is provided with an engagement notch 44 a that engages with an engagement strip 510 provided on the inner peripheral portion of the drive bush 51 of the rotation drive device 5. It has been.
The structure of the excavation part 2a is substantially the same as the excavation part 2 of the underground excavation hammer 1. The structure of the air tank 3a is substantially the same as the air tank 3 of the underground excavation hammer 1.

The underground excavation hammer 1a is used by appropriately selecting the attachment 4b or the attachment 4c and attaching it to the excavation part 2a.
The underground excavation hammer 1a can be used for excavation work in combination with the rotary excavator 6 or the rotary excavator 6a in the same manner as the underground excavation hammer 1. This has the same effect as that of the hammer 1 for use.

  The terms and expressions used in this specification are merely explanatory and are not restrictive at all, and exclude terms and expressions equivalent to the features described in this specification and parts thereof. There is no intention to do. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 Underground excavation hammer 10 Hammer main body 2 Excavation part 21 Connection body 22 Piston case 23 Piston case attachment body 24 Drive chuck 25 Chuck guide 26 Flat bar 27 Hammer bit 28 Hammer bit 29 On-off valve 211 Hole 222 Insertion part 223 Ring 230 Sand 231 Cylindrical body 232 Piston case casing 233 Front cover body 234 Base cover body 235 Insertion hole 236 Insertion hole 237 Bolt hole 241 Hole 242 Anti-rotation part 251 Bolt 252 Nut 253 Concave 254 Concave 255 255 Concave 261 First distribution Hole 262 Flow pipe 263 Second flow hole 264 Third flow hole 265 Discharge port 270 Head part 200 Button chip 280 Head part 290 Shaft part 291 Button chip 3 Air tank part 30 Air storage part 31 Nuts 32 Bolts 33 Connections 34 Connection Joints 35 Base End Faces 38 Fixing Pins 39 Stabilizing Protrusions 311 Bolt Holes 331 Flow Holes 340 Air Flow Paths 341 Engaging Grooves 371 First Flow Holes 372 Flow Pipes 373 Second Flow Holes 4 Attachment 40 Cap body 41 Joint hole 42 End plate 43 Spiral blade 44 Engagement notch 4a Attachment 40a Cap body 41a Joint hole 42a End plate 45 Flat bar 5 Rotation drive device 50 Device main body 51 Drive bush 510 Engagement strip 511 Main body 512鍔 513 Locking projection 52 Outrigger 53 Rotary table 530 Insertion hole 531 Placement step 532 Locking hole 54 Drive unit 6 Rotary excavator 60 Temporary scaffolding 7 Screw shaft 71 Suspended shaft 72 First supply pipe 73 Wire 74 First Two supply pipes 75 Spiral blade 76 Engagement notch 77 Connection joint 8 Air flow control member 81 Receiving part 82 Support body 811 Through hole 821 Flow hole 822 Through hole 93 Excavation hole 94 Soil reinforcement 95 Solidified material 6a Rotary excavator 5a Rotation drive Device 51a Drive bush 519 Engagement groove 7a Flat bar shaft 78 Flat bar 1a Underground excavation hammer 2a Excavation part 3a Air tank part 43a Spiral blade 44a Engagement notch part 4b Attachment 45a Flat bar 4c Attachment

Claims (9)

Underground excavation hammer equipped with a hammer bit (27, 28) that moves forward and backward by being driven by a working fluid and excavates the ground,
Excavator (2) provided with a hammer bit (27, 28) at the tip and a hammer body (10) provided with an air tank (3) provided on the base side of the excavator (2),
The required number of attachments that are removably attached to the air tank (3) of the hammer body (10),
With
The required number of attachments includes an attachment (4a) in which a required number of engagement bars (45) are provided in the circumferential direction on the outer periphery.
Underground excavation hammer. Underground excavation hammer equipped with a hammer bit (27, 28) that moves forward and backward by being driven by a working fluid and excavates the ground,
Excavator (2) provided with a hammer bit (27, 28) at the tip and a hammer body (10) provided with an air tank (3) provided on the base side of the excavator (2),
The required number of attachments detachably attached to the air tank (3) of the hammer body (10),
With
The required number of attachments includes an attachment (4) provided with a spiral blade (43) on the outer periphery,
Underground excavation hammer. Underground excavation hammer equipped with a hammer bit (27, 28) that moves forward and backward by being driven by a working fluid and excavates the ground,
A hammer body (10) having an excavation part (2) provided with a hammer bit (27, 28) at the tip and an air tank part (3) provided on the base side of the excavation part (2);
The required number of attachments detachably attached to the air tank (3) of the hammer body (10),
With
The required number of attachments includes an attachment (4) provided with a spiral blade (43) on the outer peripheral portion, and an attachment (4a) provided with a required number of engagement bars (45) on the outer peripheral portion in the axial circumferential direction. The attachment is used by being selectively attached to the air tank (3),
Underground excavation hammer. In the spiral blade (43) of the attachment (4) having the spiral blade (43) on the outer peripheral portion, the drive bush (51) of the rotary drive device (5) is parallel to the axial direction of the attachment (4). An engagement notch (44) is provided that engages with an engagement strip (510) provided on the periphery.
The underground excavation hammer according to claim 2. At the base end of the air tank (3), there is a connecting joint (34) with a polygonal cross section for connecting the connecting shafts (7, 7a) for earth removal. The attachment (4, 4a) is inserted into the base end through the connecting joint (34) so that the attachment (4, 4a) and the air tank (3) can rotate together in the axial direction. Formed in a cylindrical body provided with a polygonal joint hole (41),
The underground excavation hammer according to any one of claims 1 to 4. Underground excavation hammer equipped with a hammer bit (27, 28) that moves forward and backward by being driven by a working fluid and excavates the ground,
A drilling section (2a) having a hammer bit (27, 28) at the tip;
An attachment (4b) removably attached to the base side of the excavation part (2a) and provided with a spiral blade (43a) on the outer peripheral part of the air tank part (3a);
An attachment (4c) that is detachably attached to the base side of the excavation part (2a) and has a required number of engagement bars (45a) provided in the axial direction in the outer peripheral part of the air tank part (3a),
Underground excavation hammer. In the spiral blade (43a) of the attachment (4b) having the spiral blade (43a) provided on the outer peripheral portion, in the drive bush (51) of the rotary drive device (5) in parallel with the axial direction of the attachment (4b) An engagement notch (44a) is provided that engages with an engagement strip (510) provided on the periphery.
The underground excavation hammer according to claim 6. Underground excavation hammer (1,1a) according to any of claims 1 to 7,
A rotary drive device (5) for lowering the underground excavation hammer (1,1a) by its own weight and applying a rotational force in the axial direction to the underground excavation hammer (1,1a);
With
Rotary excavator. An underground excavation hammer (1, 1a) according to any one of claims 1 to 7,
A rotary drive device having a drive bushing (51) capable of lowering the underground excavation hammer (1,1a) by its own weight and applying a rotational force to the underground excavation hammer (1,1a) in the axial circumferential direction. (5) and
With
On the inner periphery of the drive bush (51), the required number of engagements with the engagement notches (44, 44a) provided on the spiral blades (43, 43a) of the attachment (4, 4b, 4c) are provided. It has the required number of engagement grooves (519) that engage with the bar (45) of the joint (510) or the attachment (4a),
Rotary excavator.

Images