JPH09279977A - Starting frame for vertical hole drilling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with previous provision of a hole for obtaining drilling reaction by fitting a cylindrical reaction receiver receiving drilling reaction on the inner face to a pillar standingly provided on a frame so as to bring down the fitting position in sucession according to the depth of the hole. SOLUTION: A plurality of holes 40 are arranged at an interval in the vertical direction on a plurality of pillars 16 provided around a frame 14, so that the fitting height of a reaction receiver 18 can be changed. The cylindrical reaction receiver 18 constituted so as to receive drilling reaction on the inner face is fitted to the hole 40 on the uppermost part of the pillar 16 through bolts 20, and a drilling machine 12 is arranged on the frame 14. Next, the ground is drilled by means of a first drilling head 128 and a second drilling head 130. Hereafter, while the depth of a vertical hole reaches up to the fixed depth capable of transmitting reaction, the ground is drilled while moving the fitting position of the reaction receiver 18 downward in order, so as to be in the range in which the drilling reaction can be transmitted to the reaction receiver 18. Hereby, the height dimension of a reaction means can be reduced, and it is unnecessary to form a hole for arranging a vertical hole drilling machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stand for starting an excavator for excavating a vertical hole.

[0002]

When constructing a vertical hole in the ground, an earth auger, a backhoe, a clamshell bucket, etc. are generally used. However, in earth augers, backhoes, clamshell buckets, etc., depth dimensions or diameters are used, such as foundations for concrete structures, foundations for towers, foundations for bridges, shafts for tunnel excavation, shafts for mining, etc. It is not possible to build a well with large dimensions.

A device for constructing a vertical hole having a large depth or diameter by rotating the excavating head about an axis extending vertically while lowering the excavating head with respect to a tubular body by one or more jacks. Have been proposed. However, in the conventional device, a hole for placing the excavator is formed on the ground side with a backhoe, a clamshell bucket, etc., and the excavator is placed in this hole so that its axis matches the axis of the hole to be constructed. After that, excavation by the excavator has started. Therefore, the work until the start of excavation by the excavator is troublesome.

In particular, when using an excavator that displaces a plurality of pressing bodies radially outward of the main body to be constructed to obtain the excavation reaction force on the surrounding ground, the excavation reaction force is applied to the surrounding ground at the start of excavation by the excavator. Since the hole that can be obtained in the ground cannot be excavated by the excavator itself, an accurate hole with a wall surface that can obtain the reaction force for excavation at the beginning of excavation by the excavator should be provided on the ground side with a backhoe, clamshell bucket, etc. It is extremely troublesome to form.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the need to pre-form accurate holes for placement of vertical hole excavators.

[0006]

SOLUTION: The starting base of the present invention has a frame having an arrangement space for arranging a vertical hole excavator and is installed on the ground, and is arranged at intervals around the arrangement space. A plurality of columns extending upward from the frame, a cylindrical reaction force receiving means for receiving a reaction force at the time of excavation by the excavator on the inner surface, and the reaction force in a state where the axis of the reaction force receiving means extends in the vertical direction. Attachment means for removably attaching to the post outside the receiving means.

The vertical hole excavator is arranged in an arrangement space provided in the frame, and a plurality of pressing bodies of the excavator are pressed against the inner surface of the reaction force receiving means. In this state, while the excavating head of the excavator is being pushed down by the pushing means with respect to the cylindrical main body, the excavating head is rotated around the axis extending in the vertical direction to excavate the hole. The excavation reaction force at this time is transmitted to the reaction force receiving means by the pressing body.

When a hole having a wall surface capable of pressing the pressing body is excavated by the excavator itself, the excavator is operated with the pressing body pressed against the wall surface of the hole excavated by the excavator itself. The digging head is rotated around the axis of the body while being pushed down against the tubular body to dig further holes. The excavation reaction force at this time is transmitted to the wall surface of the hole by the pressing body.

According to the present invention, the cylindrical reaction force receiving means for receiving the reaction force at the time of excavation on the inner surface is detachably attached to the support column outside the reaction force receiving means in a state where the axis thereof extends in the vertical direction. Even if an excavator that displaces a plurality of pressing bodies outward in the radial direction of a vertical hole to obtain an excavation reaction force in the surrounding ground is used, an accurate wall surface that receives the excavation reaction force of such an excavator is used. There is no need to preform the holes.

It is preferable that each of the columns has mounting portions to which the reaction force receiving means is detachably attached by the mounting means at a plurality of positions vertically spaced from each other. In this case, when a hole having a predetermined depth is excavated, the work of lowering the height position of the reaction force receiving means is performed once or more. Such an operation is performed by removing the reaction force receiving means from the column, lowering the height position of the reaction force receiving means, and reattaching the reaction force receiving means to the column by the attaching means. After such work, excavation work by the excavator is performed again. According to the above, the height dimension of the reaction force means can be reduced.

The reaction force receiving means is a cylindrical reaction force receiving device having female screw portions at a plurality of positions spaced in the circumferential direction and the axial direction thereof, and is provided outside the reaction force receiving device and is connected to the column. And a plurality of screw members that are screwed into the female screw portion and extend through the reaction force receiver in the radial direction thereof. In this way, the axis of the excavator body, the casing or the like arranged on the upper side of the body is adjusted with respect to the axis of the reaction force means by adjusting the amount of protrusion of the screw member inside the reaction force means. can do.

[0012] It is preferable that the connecting means includes a bolt penetrating the connecting body and the support column in the tangential direction to the outer surface of the reaction force receiver, and a nut screwed to the bolt. This facilitates attachment and detachment of the reaction force receiving means to the column.

It is preferable that the reaction force receiver has a plurality of plate-like members curved in an arc shape and a plurality of connecting members for connecting the plate-like members into a tubular shape. This allows the reaction force means to be composed of a plurality of small and lightweight members,
Assembling and disassembling the reaction means is facilitated.

In a preferred embodiment, the plate-like members adjacent to each other in the circumferential direction of the reaction force receiving member are connected to each other at a plurality of vertical positions.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a starting base 10 is used as a device for lowering a vertical hole excavator 12.

Example of starting frame

The starting mount 10 includes a frame 14 installed on the ground, a plurality of columns 16 arranged at intervals around an axis extending vertically in the frame and extending upward from the frame 14, and an excavation reaction force. A cylindrical reaction force receiver 18 that receives the inner surface of the reaction force receiver, and a bolt 20 that is detachably attached to the column 16 outside the reaction force receiver 18 such that the axis of the reaction force receiver extends in the vertical direction.

The frame 14 forms a placement space 22 for the excavator 12 by vertically and horizontally connecting a plurality of steel materials 14a having an H-shaped cross section. The frame 14 is installed on the ground by a plurality of outriggers 24 so that the upper surface is horizontal. Space 26 adjacent to the arrangement space 22
Can be used as an installation space for a hoisting machine such as a jib crane and an operating space for the excavator 12 by further connecting a plurality of steel materials or iron plates to the frame 14.

As shown in FIGS. 3, 5 and 6, each strut 16 includes an H-shaped steel 28, a pair of side plates 30 welded so as to close the opening of the H-shaped steel, and the H-shaped steel 28 and It is formed by a substrate 32 fixed horizontally to the lower end of the side plate 30 and a plurality of ribs 34 welded to the H-shaped steel 28, the side plate 30 and the substrate 32, and in the substrate 32 by a plurality of bolts 36 and nuts 38. It is removably attached to the frame 14.

A plurality of holes 40 penetrating the support columns 16 in the tangential direction of the reaction force receiving member 18 are formed at intervals in the vertical direction, and a plurality of female screw portions 42 are provided outside in the vertical direction. Are spaced apart. Each female screw part 4
In the illustrated example, 2 is a nut welded to the column 16, but it may be a screw hole formed in the column 16. A bolt 44 is screwed into each female screw portion 42. Each bolt 44 penetrates the support column 16 in the radial direction of the reaction force receiver 18 and projects to the inside of the support column 16, and is used for position adjustment of the reaction force receiver 18 with respect to the support column, that is, centering.

As shown in FIGS. 3 to 10, the reaction force receiver 18
Is a plurality of arcuately curved plate-shaped members 46, and a plurality of coupling members that are vertically spaced apart from each end of each plate-shaped member in order to couple the plate-shaped members in the circumferential direction. Plate 4
8 and a plurality of connecting members 50 for connecting the plate member 46. In the illustrated example, the reaction force receiver 18 has four plate-shaped members 46.

Each coupling plate 48 has a hole penetrating vertically, and is fixed to the outside of the plate member 46 by welding or the like so that the holes of the plates 48 vertically adjacent to each other are coaxial. ing. Each coupling member 50 is a coupling pin that is inserted through the holes of the plurality of plates 48 from above so as to couple the plate-shaped members 46 that are adjacent in the circumferential direction in a separable and bendable manner. 52. However, other rod-shaped members such as bolts may be used instead of the coupling pin.

As shown in FIGS. 5, 8 and 10, the plate-like members 46 adjacent to each other in the circumferential direction are connected to the connecting plate 54,
Female screw member 5 welded to the outside of each end of each plate member 46
6 and a screw 58 screwed into each female screw member 56 so as to be relatively immovable. This allows
The reaction force receiver 18 is maintained in a tubular shape.

Each plate-shaped member 46 has internal threaded portions 60 at a plurality of locations spaced in the circumferential and vertical directions. In the illustrated example, each female screw portion 60 is a nut welded to the outer surface of the plate member 46. A male screw member 62 is screwed into each female screw portion 60. The male screw member 62 extends through the plate-shaped member 46 and thus the reaction force receiver 18 in the radial direction thereof.

As shown in FIGS. 6 and 7, the reaction force receiver 1
8 has a pair of plates 64 opposed to each other at intervals in the circumferential direction, and a spacer 66 that forms a space for receiving the support 16 between both plates 64 on the upper portion of the outer surface of each plate member 46. The plates 64, the spacers 66, and the pair of plates 64 are welded to each other and to the outer surface of the plate-like member 46 so as to cooperate with each other to form a column receiving space having a U-shape in a plan view. Each plate 64 is
It is reinforced by a plurality of ribs 68 welded to the outer surface of the plate member 46.

As shown in FIGS. 6 and 7, each bolt 2
0 is a state in which each support 16 is received between the pair of plate-shaped members 46, and is penetrated through one plate 64, the hole 40 of the support 16 and the other plate 64 in that order. Each bolt 20, together with the nut 70 screwed to the bolt, acts as an attachment means for detachably attaching the reaction force receiver 18 to the column 16. Instead of bolt 20,
Other rod-shaped members such as pins may be used.

The reaction force receiver 18 passes each bolt 20 through the support column 16 and both plates 64 as described above, and each bolt 2
The nuts 70 are assembled to the support columns 16 by screwing the nuts 70 into the 0, and the nuts 70 are removed from the support columns 16 by removing the nuts 70 from the bolts 20 and the bolts 20 from the support column 16 and both plates 64. Reaction force 18
The height position can be changed by changing the hole 40 of the column 16 through which the bolt 20 is passed.

Example of vertical hole excavator

Referring to FIGS. 11 and 12, the vertical hole excavator 12 has an axis 122 extending in the vertical direction, and receives a casing 124 arranged in the upper portion.
As the casing 124, a short cylindrical casing, a casing in which a plurality of arc-shaped curved plate members are connected in a tubular shape, a casing in which a plurality of liner plates are connected in a tubular shape, and the like can be used.

The excavator 12 has a short cylindrical body 126 coaxial with the axis 122 and an axis 122 at the lower end of the body.
An annular first drilling head 128 rotatably disposed about the first drilling head 128 and an axis 122 with the first drilling head 128 coaxially disposed in the central portion of the first drilling head 128.
Second bucket-shaped excavating head 13 rotated around the
0 and a drive mechanism 1 for rotating the first drilling head 128
32 and a moving mechanism 1 for vertically moving the main body 126.
34 and a receiving means 136 for receiving the casing 124 arranged above the moving mechanism 134.

An annular bottom plate 13 is provided at the lower end of the main body 126.
Reference numeral 8 is coaxially connected in the shape of an inward flange by a plurality of screw members such as bolts and nuts (not shown). An annular floor 140 is separably assembled on the bottom plate 138. The worker uses the ladder to move from the ground to the floor 1
You can move to 40 and vice versa. Therefore, the worker can use the floor 140 as a work floor for performing a work for inspecting the state of the hole bottom, a work for inspecting the excavator 12, and the like.

Although not shown, the main body 126 and the bottom plate 1
38 and the floor 140 are respectively the axis 1 of the body 126.
It can be divided into a plurality of members, preferably three or more, around the member 22, and adjacent members in the circumferential direction are separably connected by a plurality of screw members such as bolts and nuts. Thereby, the main body 126, the bottom plate 138, and the floor 140 can be easily transported, and they can be disassembled and removed.

Although not shown, the divided parts of the main body 126 are separably connected to the divided parts of the bottom plate 138 and the floor 140 by a plurality of screw members such as bolts and nuts. Similarly, the bottom plate 138 and the floor 14
Each divided part of 0 is separably connected to two divided parts of the main body 126 by a plurality of screw members such as bolts and nuts. Thereby, the joining strength of the members adjacent in the circumferential direction is increased.

The first excavation head 128 is rotatably supported on the lower end of the main body 126 about the axis 122, and the second excavation head 130 is arranged coaxially so as to be detachable from above. It has a space in the center.

As shown in FIGS. 11 to 15, the first excavation head 128 has an annular upper plate portion, that is, the upper plate portion 14.
2, an annular lower plate-shaped portion or bottom plate portion 144, a short cylindrical outer plate portion or outer plate portion 146, a short cylindrical inner plate portion or inner plate portion 148, and a bottom plate portion 144.
A plurality of cutter assemblies 150 attached to the lower side of the bottom plate portion 144 for excavating the earth and sand below the bottom plate portion 144, and a plurality of cutters attached to the outside of the outer plate portion 146 for excavating the earth and sand around the outer plate portion 146. 152 and.

Top plate portion 142, bottom plate portion 144, outer plate portion 14
6 and the inner plate portion 148 are fixed to each other by welding or the like so as to jointly form an annular inner space extending around the axis 122. However, the upper plate portion 142, the bottom plate portion 144, the outer plate portion 146, and the inner plate portion 148 may be separably joined by a plurality of screw members such as bolts and nuts.

Although not shown, the first drilling head 1
28 can be divided into a plurality of members around the axis 122 of the main body 126, and the members adjacent in the circumferential direction are separably connected by a plurality of screw members such as bolts and nuts.
Therefore, the upper plate portion 142, the bottom plate portion 144, the outer plate portion 146.
And the inner plate portion 148, respectively.
It is formed of a plurality of members corresponding to the 28 divided members. As a result, the first excavation head 128 can be easily transported, and the first excavation head 128 can be disassembled and removed.

The internal space of the first excavation head 128 is divided into a plurality of chambers by a plurality of partition plates 154.
The bottom plate portion 144 forms a frustoconical lower surface that is inclined so that the central portion is lower than the peripheral portion, and the axis 1
Openings 156 are provided at a plurality of locations (two locations facing each other in the illustrated example) spaced around 22.

As shown in FIGS. 11 to 15, the first excavation head 128 is rotatably attached to the lower end portion of the main body 126 by a support shaft 160 and a bracket (not shown) so as to be rotatable about an axis parallel to the axis 122. Multiple rollers 1
62 and the upper plate portion 142 so as to extend around the axis 122.
The receiving ring 164 attached to the
4 is rotatably assembled to the lower end of the main body 126 by an assembly ring 166 mounted on the upper surface of the main body 4 by a plurality of screw members such as bolts.

The rollers 162 are arranged at evenly spaced positions on a virtual circle around the axis 122, and are assembled to the bottom plate 138 and the floor 140. Each roller 162 has a V-shaped groove 162a continuous in the circumferential direction on the outer peripheral surface. In the illustrated example, six rollers 162 are provided. Rings 164 and 166 have axis 12
2 extends coaxially with the body 126. Ring 166
Has an annular engaging portion 166a slidably fitted in the groove 162a of the roller 162, and an outward gear portion provided on the upper side of the engaging portion 166a, that is, an external gear portion 166b. However, instead of the external gear portion, an inward gear portion, that is, an internal gear portion may be used.

Roller 162 and rings 164 and 166
Are protected by a cover 168. Cover 168
Extends annularly along the inner edge of the floor 140 and is removably attached to the inner edge of the floor 140 by a plurality of screw members such as bolts. Ring 16
4, 166 and cover 168 respectively have axis 12
It is divided into a plurality of members around 2, and adjacent members in the circumferential direction are separably connected by a plurality of screw members such as bolts and nuts.

Each cutter assembly 150 has an elongated base portion removably attached to the lower side of the bottom plate portion 144 by a plurality of screw members such as bolts, and one edge portion in the width direction of the base member. A plurality of cutters mounted at intervals. Each cutter assembly 150 corresponds to the opening 156 of the bottom plate portion 144, and of the edges forming the corresponding opening 156, the first drilling head 12 is provided.
8 rotation direction (direction shown by arrow in FIGS. 12 and 13)
At the rear edge, the cutting edge of the cutter is the first drilling head 1
28 and the cutter assembly 150
Is arranged so as to partially overlap with the opening 156.

The drilling material from each cutter assembly 150 is received in the interior space of the first drilling head 128 from the corresponding opening 156 in the bottom plate portion 144. Therefore, a portion of the internal space that communicates with the bottom plate portion 144 through the opening 156 is the chamber 170 that receives the excavated material.
Each chamber 170 has a second portion through an opening 172 (see FIG. 14) formed by lacking a part of the inner plate portion 148.
Of the excavating head 130.

A plurality of openings 174 are formed in the outer plate portion 146 (see FIG. 14). Each of the cutters 152 is arranged at the edge portion forming the opening 174 such that the blade edge of the cutter 152 is ahead of the first excavation head 128 in the rotation direction and the blade edge of the cutter 152 overlaps a part of the opening 174.
The excavated material by the cutter 152 is received in the chamber 170 through the opening 174 formed in the outer plate portion 146.

The first excavating head 128 has a guide 176 in each chamber 170 for forcibly moving the excavated material received in the chamber 170 from the opening 172 to the space with the rotation of the first excavating head 128. . However, such an action may be performed on another member such as the base member of the cutter assembly 150, or the cutter assembly 150 may be performed by making the cutter of the cutter assembly 150 into a plow-shaped cutter. You may let me.

As shown in FIGS. 11 to 19, the second excavating head 130 has a cylindrical tubular portion 180 which is detachably received in the space of the first excavating head 128, and the tubular portion 1.
It has a bottom portion 182 that closes the lower end of 80, a cutter assembly 184 arranged below the bottom portion 182, and a plurality of cutters 186 arranged on the outer periphery of the lower end portion of the tubular portion 180.

The upper end outer peripheral surface of the tubular portion 180 is reinforced by a belt-shaped member 188 fixed to the upper end outer peripheral surface by a plurality of screw members. A plurality of stoppers 190 are fixed to the belt-shaped member 188. The tubular portion 180 has an outer diameter dimension that is slightly smaller than the diameter of the space portion of the first excavation head 128, and a vertical length dimension that is larger than the first excavation head 128.

The diameter dimension of the rotation locus of the stopper 190 is
It is smaller than the inner diameter dimension of the upper plate portion 142 of the first drilling head 128, but larger than the inner diameter dimension of the bottom plate portion 144. Therefore, the second excavation head 130 is replaced by the first excavation head 128.
The second excavation head 1 when it is inserted from above into the space of the
The stopper 190 contacts the bottom plate portion 144, so that the tubular portion 180 is maintained in a state of protruding downward from the bottom plate portion 144 and is vertically positioned with respect to the first excavation head 128.

The tubular portion 180 has the first excavation head 128.
Axis 122 to receive the drilling material in chamber 170 of
A plurality of notches 1 formed at equal angular intervals around the
92 at the upper end. In the illustrated example, the notch 192
Are formed at two opposite locations, like the openings 156 and 172 of the first drilling head 128.

At the upper end of the tubular portion 180, the long member 19
4 are connected. The long member 194 has a tubular portion 180.
Diametrically. A long suspending member 196 is connected to a central portion of the long member 194 in the longitudinal direction so that one end of the suspending member 196 can pivot about an axis extending in the horizontal direction. The suspending member 196 has a suspending ring 198 at the other end for hooking a lifting machine such as a crane.

The bottom portion 182 has a plurality of openings 2 for receiving the excavated material by the cutter assembly 184 into the tubular portion 180.
00. The opening 200 corresponds to the cutter assembly 184, is formed at two opposite positions in the illustrated example, and has a rectangular shape extending in the diameter direction of the second drilling head 130.

Each cutter assembly 184 includes a plurality of long base members removably attached to the lower side of the bottom portion 182 by a plurality of screw members such as bolts, and a plurality of cutters attached to each base member. With. The base member of each cutter assembly 184 has an edge that is behind the rotation direction of the second excavation head 130 (the direction indicated by the arrow in FIGS. 12, 13, and 16) in the edge portion that forms the corresponding opening 200. The cutting edge of the cutter is attached to the second excavation head 13
A part of the cutter is open 2
00 are arranged so as to partially overlap with each other.

The tubular portion 180 also has a plurality of openings 202 at the lower end for receiving the excavated material by the cutter 186 into the tubular portion 180. The opening 202 is a cutter 186.
In addition, in the example shown in the figure, it is formed at two opposite locations. The opening 202 extends in the circumferential direction of the tubular portion 180.

Each cutter 186 is detachably attached to the lower end of the tubular portion 180 by a plurality of screw members such as bolts. Each cutter 186 has a second drilling head 130 out of the edges forming the corresponding opening 202.
The cutting edge is arranged at the edge of the rear of the second excavating head 130 in the rotational direction, and is arranged so as to overlap a part of the opening 202.

The tubular portion 180 also has stepped portions 204 projecting inward at each of two opposing lower end portions. A part of each opening 202 extends to the step portion 204, and each cutter 186 is arranged on the step portion 204. A pin 206 is attached to each step portion 204 by welding or the like. Both pins 206 project to the outside of the tubular portion 180 from the opposing portions.

The second drilling head 130 also has a bottom 1
A lid 208 that opens and closes each opening 200 of 82 is provided above the bottom portion 182. Each lid 208 is attached to the upper surface of the bottom portion 182 so as to be pivotable about an axis extending horizontally in parallel to the diameter direction of the tubular portion 180. Therefore, each lid 208 normally closes the opening 200 by its own weight. However, as the second drilling head 130 is rotated, each lid 208 is pushed up by the excavation by the cutter assembly 184, thereby opening the opening 200.

A cutter 210 is attached to the bottom portion 182 (see FIGS. 11 and 16). Cutter 21
0 is arranged downward in the central portion of the lower surface of the bottom portion 182 so as to excavate the earth and sand corresponding to the central portion of the vertical hole to be constructed. The inner diameter dimension of the floor 140, the rings 164, 166 and the cover 168 is larger than the maximum outer diameter dimension of the second drilling head 130.

The drive mechanism 132 includes a plurality of rotation sources 214 with reduction gears, and a gear 216 (see FIG. 15) attached to the output shaft of each rotation source 214. Rotation source 21
4 are mounted on the body 126 such that the gears 216 are equiangularly spaced about the axis 122. Each gear 2
16 meshes with the gear portion 166b of the ring 166. Thus, when the rotation source 214 is rotated, the ring 166 is rotated about the axis 122 and thus the first drilling head 128 is rotated about the axis 122.

When the first drilling head 128 is rotated,
A plurality of engagement pieces 218 provided on the inner peripheral surface of the first excavating head 128 engage with stoppers 190 provided on the outer peripheral surface of the second excavating head 130, whereby the second excavating head 130 is moved. It is rotated with the first drilling head 128. The engagement piece 218 allows the second excavation head 1 to move when the second excavation head 130 is arranged on the first excavation head 128.
Even if 30 is slightly displaced with respect to the first drilling head 128, the second drilling head 130 is correctly guided into the space of the first drilling head 128 so that the opening 172 and the notch 192 face each other. .

When the engaging piece 218 and the stopper 190 come into contact with each other as the first excavating head 128 rotates, a plurality of convex pieces 220 provided on the outer peripheral portion of the upper end of the second excavating head 130 (see FIG. 11). ) Is pushed downward by the first drilling head 128. Thereby, the second drilling head 1
30 is releasably prevented from rising relative to the first drilling head 128. The convex piece 220 has an inclined upper surface that becomes lower toward the front in the rotation direction of the first excavation head 128.

As shown in FIGS. 3, 4, and 20 to 24, the moving mechanism 134 is provided with a cylindrical frame body 230 fitted to the upper outside of the main body 126. Main body 126 and frame 23
0 means that relative displacement in the direction of the axis 122 is possible by one or more detent means, but rotation about the axis 122 is impossible.

An example of such a detent means is shown in FIGS. 25 and 26. In the illustrated example, the rotation preventing means includes a stopper 232 attached inside the lower end portion of the frame body 230 so as to extend in the vertical direction, and a main body 1 so as to extend in the vertical direction.
26 and a groove 234 formed on the outer side of the upper portion of 26. The stopper 232 and the groove 234 extend in the vertical direction and are fitted so as to be relatively slidable in the vertical direction.

The frame body 230 can be divided into a plurality of members in the circumferential direction of the frame body.
As shown in FIGS. 0 to 22, a plurality of bolts 236 and nuts 238 are detachably connected.

The frame 230 has a recess 24 that is open to the outer peripheral side.
0 is provided at a plurality of locations on the lower outer periphery. Each recess 240 has a groove 1
A portion slightly higher than the height position of 32 extends in the circumferential direction, and the recesses 240 that are adjacent to each other in the circumferential direction are separated by the connecting portions of the adjacent dividing members of the frame body 230.

A pressing body 242 for reaction force is provided in each recess 240.
Is arranged. Each pressing body 242 has a corresponding recess 2
It is arcuately curved to fit 40, and has an arcuate surface on the outside that extends around axis 122.
In the example shown, the width dimension of this arcuate surface or outer surface,
That is, the dimension in the direction of the axis 122 is large, and therefore the outer surface of the pressing body 242 has a large area.

The pressing bodies 242 adjacent to each other in the circumferential direction are connected by a reaction force jack group, that is, a first jack group, so that their circumferential end portions are relatively displaced in a direction in which they are offset from each other. There is. Each first jack group includes a first jack 244 that is vertically spaced. Each first jack 244 is a fluid pressure jack such as a hydraulic jack, and a plate-like connecting member 246 allows
The cylinder is pivotally connected to the end of one pressing body 242, and the piston rod is pivotally connected to the end of the other pressing body 242.

Each connecting member 246 has a corresponding pressing member 24.
2 extends from the circumferential end of the frame body 230 to the inside of the frame body 230 through the opening 248 of the frame body 230. Each connecting member 246 and the pressing body 242 are connected integrally or by welding. A plurality of first jacks 244 and a plurality of connecting members 246 of each first jack group for displacing the same pressing body 242.
Is to synchronize the expansion and contraction of the first jack 244,
A common pivot 250 is connected for pivotal movement.

The main body 126 and the frame body 230 have an axis line 122.
The second jacks 252 are connected to each other at a plurality of locations around the. The cylinder of each second jack 252 is pivotally connected to the bottom plate 138 by a pin-based connector 256, and the piston rod is a pin-based connector 2.
55 is pivotally connected to the frame body 230. Second
The stroke of the jack 252 is preferably substantially the same as the vertical dimension (width dimension) of the outer surface of the pressing body 242, but is larger than the vertical dimension (width dimension) of the outer surface of the pressing body 242. Good.

In the moving mechanism 134, when the first jack 244 is contracted, the adjacent pressing members 242 are drawn, so that each pressing member 242 is set in FIG.
0, as shown by the solid lines in FIGS. 21 and 23, are housed in corresponding recesses 240.

On the other hand, when each first jack 244 is extended, the adjacent pressing bodies 242 are separated from each other, so that each pressing body 242 is shown by a chain double-dashed line in FIGS. As indicated by the solid line in FIG. 22, the frame 230 is moved outward in the radial direction, and as a result, each pressing body 242 is
A part of the protrusion protrudes from the corresponding recess 240 and is pressed against the surrounding ground.

Therefore, the moving mechanism 134 includes the pressing body 2
The main body 12 is pushed by the second jack 252 while the reaction force is exerted on the surrounding ground by pressing 42 on the surrounding ground.
Push 6 down. Thereby, the first drilling head 128
Is pushed downward by the moving mechanism 134 via the main body 126, and the second excavating head 130 is pushed downward by the main body 126 and the first excavating head 128.

As shown in FIGS. 23 and 24, the receiving means 136 includes an annular casing receiver 260 disposed inside the upper portion of the frame 230 to receive the casing 124, and the casing receiver via a second jack 252. Body 1
And a plurality of connecting bodies 262 connected to 26.

The casing receiver 260 has an L-shaped cross section, and the inside of the upper portion of the frame 230 can be divided into a plurality of arc-shaped members extending in an arc shape. Adjacent arc members are separably connected by a plurality of screw members such as bolts and nuts so that the casing receiver 260 extends inside the upper portion of the frame body 230.

In the illustrated example, each connecting body 262 is a plurality of elongated members having a U-shaped cross section. Each connected body 2
62 is separably connected to the casing receiver 260 by a plurality of screw members 264 at the upper end and is connected to the cylinder of the second jack 252 by a plurality of screw members 266 at the lower end.

The casing 124 is detachably connected to the casing receiver 260 by a plurality of screw members 268 such as bolts. The operation of connecting the casing 124 to the casing receiver 260 is performed on the ground. Grooves 294 that open outward are formed at the upper and lower ends of the casing 124 so that an operator's hand can be inserted during connection and disassembly.

Embodiment of Vertical Hole Drilling Method

In the starting frame 10, first, the reaction force receiving 18
Starting frame 10 is installed on the ground with the stand removed.
On the frame 14 is the first excavation head 128 of the excavator.
An appropriate table for receiving the object is arranged in advance so as to be removable. Each bolt 44 is retracted in advance so as not to interfere with the arrangement of the reaction force receiver 18.

Next, the reaction force receiver 18 is attached to the support column 16 by the bolt 20 and the nut 70 using a raising and lowering machine such as a crane. Each bolt 20 is a pillar 1
6 into the top hole 40. Therefore, the reaction force receiver 18 is attached at the highest position. Reaction force received 1
8 is a pillar 16 in a state where each plate member 46 is connected in a tubular shape.
Alternatively, the plate member 46 may be temporarily assembled to the column 16, the adjacent plate members 46 may be coupled to each other by the coupling means, and then the bolt 20 and the nut 70 may be attached to the column 16.

When the reaction force receiver 18 is assembled to the column 16, by adjusting the screwing amounts of the appropriate plurality of bolts 44 into the female screw member 42 to adjust the projecting amount of the bolts 44 from the column 16, the frame 14 and The reaction force receiver 18 is aligned with the column 16, that is, centered. Although the bolt 44 may be retracted after the centering, it is preferable to keep the bolt 44 in contact with the outer surface of the reaction force receiver 18. By doing so, the excavation reaction force acting on the reaction force receiver 18 can be transmitted to the column by the bolt 44.

Then, the first jacks 224 are completely contracted, the second jacks 252 are substantially contracted, and the second excavating head 130 is removed from the first excavating head 128. Is installed on the frame 14 using a lifting and lowering machine. As a result, the excavator 12
The distance between the ground surface and the lower surface of the first drilling head 128 is the first
Of the second drilling head 130 from the drilling head 128 of FIG.

Even when the excavator 12 is arranged on the frame 14, the bolts 6 from the reaction force receiver 18 are adjusted by adjusting the screwing amounts of the appropriate bolts 62 into the female screw member 60.
By adjusting the amount of protrusion of 2, the main body 126 and thus the excavator 12 are aligned with the frame 14, that is, centered. In this case, the bolt 6 used for centering
2 is retracted.

Then, the second excavation head 130, which does not contain the excavation material, is assembled to the first excavation head 128 using a hoisting machine. As a result, the second excavation head 130 is maintained at a height where the lower end thereof contacts the ground surface.

Then, the respective first jacks 244 are synchronously extended simultaneously. As a result, the pressing body 242 is pushed outward in the radial direction of the main body 126 and pressed against the inner surface of the reaction force receiver 18.

Then, the respective second jacks 152 are synchronously and completely retracted at the same time. This allows the first and second
Drilling heads 128 and 130 are slightly raised relative to body 126. The reaction force at this time is the pressing body 24.
2 is transmitted to the reaction force receiver 18.

Then, in that state, the platform that has been receiving the first excavation head 128 until then is removed from the frame 14. As a result, the excavator 12 is placed in a state capable of excavating the ground.

In the excavator 12, the second excavation head 130 that does not contain the excavated material is replaced by the first excavation head 128.
The second excavation head 130 is positioned by the stopper 190 and the engagement piece 218 so that the notch 192 faces the opening 172. This positioning operation is performed in the first state until the engaging piece 218 of the first excavating head 128 engages with the stopper 190 of the second excavating head 130 in a state where each first jack 244 is extended.
This is done by rotating the excavation head 128 of FIG.

Next, in the state where each first jack 244 is extended, the rotation source 214 of the drive mechanism 28 is rotated while the second jack 252 is extended in synchronization. This causes the gear 216 to rotate, which causes the ring 166 to rotate about the axis 122 and the first and second drilling heads 128, 30 to rotate about the axis 122 relative to the body 126.

The propulsive reaction force, that is, the pushing down reaction force resulting from the extension of the second jack 252 is received by the reaction force receiving member 18 through the frame body 230, the first jack 244 and the pressing body 242.
Is transmitted to First and second drilling heads 128,3
The rotational reaction force caused by the rotation of 0 is generated by the groove 234 and the stopper 2
It is transmitted to the reaction force receiver 18 via 32, the frame body 230, the first jack 244 and the pressing body 242. in this case,
When the bolt 44 is in contact with the reaction force receiver 18, the reaction force transmitted to the reaction force receiver 18 is applied to the plate 64 and the bolt 2.
Not only is it transmitted to the support column 16 via 0, but it is also transmitted to the support column 16 via the bolt 44 that is in contact with the reaction force receiver 18.

While the first excavation head 128 is rotated, the second excavation head 130 is moved to the first excavation head 128.
Since it is pressed against the sediment below the second excavation head 130, the sediment under the second excavation head 130 is excavated by the cutter assembly 184 and the cutter 210. The excavated material by the cutter assembly 184 and the cutter 210 is
With the rotation of the second drilling head 130, the lid 208
The opening 200 of the second drilling head 130 while pushing up the
Enters the cylindrical portion 180.

When the second excavating head 130 is rotated,
The soil around the lower end of the second excavation head 130 is excavated by the cutter 186. The excavated material by the cutter 186 is moved to the second
Of the excavating head 130 into the tubular portion 180. Accordingly, when excavating, the second excavation head 130
The frictional force acting on the outer peripheral surface of is reduced.

When each second jack 252 is extended, the cylinder of the second jack 252 moves downward, so that the main body 126 is pushed down and the receiving means 136 is pulled down.

When each of the second jacks 252 is completely extended, each of the first jacks 244 is contracted, so that each pressing body 242 is separated from the surrounding ground. In this state, each second jack 252 is contracted. As a result, the moving mechanism 134 is lowered by its own weight.

By rotating the first and second excavation heads 128 and 30 while extending the respective second jacks 252 in the state where the respective first jacks 244 are extended as described above, the main body 24 The excavation step of excavating the ground while pushing down the bottom and the lowering step of lowering the moving mechanism 134 by contracting the second jacks 252 while contracting the first jacks 244 are performed at least once. Be seen.

When the excavator 12 is lowered to a position where the reaction force cannot be transmitted to the reaction force receiver 18 by performing such a process once or more, the height position of the reaction force receiver 18 is changed. Work is done. In this height position changing work, the bolts 20 and the nuts 70 are removed while the first and second jacks 144 and 152 are contracted and the reaction force receiver 18 is suspended by the crane, and the reaction force receiver 18 is removed. The bolts 20 to the predetermined height position and attach each bolt 20 to the next hole 4
It can be carried out by inserting it into 0 and screwing the nut 70 into the bolt 20.

In the case of the illustrated example, in the height position changing work, the size of the reaction force receiver 18 in the vertical direction is almost twice the size of the pressing body 242 in the same direction, so the excavation process and movement by the excavator 12 are performed. The process of lowering the mechanism 134 is performed every time it is performed twice.

When the excavator 12 is lowered by the first excavation head 128 to a position where the ground can be excavated below, the rotation of the first excavation head 128 causes the sediment below the first excavation head 128. Is excavated by the cutter assembly 150, and the soil around the first excavation head 128 is excavated by the cutter 152.

The excavated material by the cutter assembly 150 is
With the rotation of the excavating head 128, the chamber 170 enters the chamber 170 through the opening 172 of the first excavating head 128, and then is forcibly moved toward the notch 192 by the guide 176. As a result, the excavated material in the chamber 170 is transferred from the opening 172 of the first excavating head 128 to the second excavating head 1.
It is securely pushed into the tubular portion 180 via the notch 192 of the 30. Therefore, the excavated material by the cutter assembly 150 can be collected in the second excavation head 130 without manual labor.

The excavated material by the cutter 152 is rotated by the first excavating head 128, and the first excavating head 1 moves.
The chamber 170 enters through the opening 174 of 28. This reduces the frictional force acting on the outer peripheral surface of the first excavation head 128 during excavation.

Both the steps of excavation and lowering and the work of changing the height position are repeated until the pressing body 242 can transmit the reaction force to the wall surface of the vertical hole excavated by the excavator 12.
In the illustrated example, three holes 40 are formed in each of the columns 16 by repeating both the steps and the height position changing work three times.

While the above steps and operations are repeated, the casing 124 is detachably connected to the casing receiver 260 by the bolts 298, and a new casing 1 is
24 is detachably connected to the existing casing by bolts. The casing 124 has a casing receiver 26.
Lowered with 0. The connecting operation of the casing 124 may be performed while the excavation work is temporarily stopped, may be performed in parallel with the excavation work, and may be performed in parallel with the excavation work discharge work described later.

When the pressing body 242 can transmit the excavation reaction force to the wall surface of the vertical hole, thereafter, the first jacks 244 are extended to press the pressing body 242 against the wall surface of the vertical hole to excavate the ground. The step and the step of lowering the moving mechanism 134 in a state where the first jacks 244 are contracted to separate the pressing body 242 from the wall surface of the vertical hole are repeated a plurality of times. During the repetition of such steps, the new casing is detachably connected to the existing casing and the excavated material is discharged. As a result, the casing 124
Are sequentially arranged in the vertical direction on the excavation mark, that is, the vertical hole.

When the cylindrical portion 180 accommodates a predetermined amount of excavated material, the driving mechanism 28 is first stopped to suspend the excavation work. Then, the hook of the hoisting and lowering machine is hooked on the ring 198 of the second excavating head 130, and the second hoisting and lowering machine 130 is lifted to the ground side by the hoisting and lowering machine.

Second excavation head 1 suspended on the ground
The excavated material in 30 is transferred to a dump truck (not shown). The pin 206 provided on the tubular portion 180 is hooked on a pillar provided on the ground when the excavated material in the second excavating head 130 is transferred to the dump truck, and the second excavating head 130 is turned over. Make it easy.

When the transfer of the excavated material from the second excavating head 130 is completed, the second excavating head 130 is suspended in the vertical hole by the hoisting and lowering machine, and the first excavating head 1
After that, the excavation work is restarted.

When the second excavating head 130 is mounted on the first excavating head 128, if the second excavating head 130 is displaced from the first excavating head 128 in the radial direction,
The tubular portion 180 is the upper plate portion 142 of the first drilling head 128.
And the second excavation head 130 cannot be mounted in the space of the first excavation head 128.
In order to prevent this, it is necessary to lower the second excavating head 130 with the axis of the second excavating head 130 aligned with the axis of the first excavating head 128. However, it is troublesome to perform such work manually.

However, in the excavator 12, the second excavating head 130 is lowered with the lower end of the tubular portion 180 abutting on the engaging piece 218, so that the second excavating head 130 is moved.
When the second excavation head 130 is installed in the space of the first excavation head 128,
28, the lower end of the tubular portion 180 is guided to the center of rotation, that is, the side of the axis line 122 by the engagement piece 218 even if the second excavation head 130 is lowered. The head 130 is the first drilling head 12
It can be installed in the space of 8.

When the second excavating head 130 is mounted in the space of the first excavating head 128, the second excavating head 1
Since the earth and sand around the tubular portion 180 of the 30 are excessively excavated by the cutter 186, the second and fourth cutters 4
Second drilling head 13 into the hole formed by 2, 46
0 can be easily attached and detached, and as a result, the work of attaching and detaching the second excavating head 130 to and from the first excavating head 128 for discharging the excavated material is facilitated.

When correcting the forward direction of the excavator 12,
The drive mechanism 132 is driven while at least one jack 252 is extended. Thereby, the forward direction of the excavator 12 with respect to the vertical line is gradually corrected. At least 1
When the two jacks 252 are extended by a predetermined amount, the excavator 12
The forward direction of is corrected to the right direction with respect to the vertical line. Therefore, thereafter, the driving mechanism 132 is driven while all the jacks 252 are synchronously extended at the same speed.

The drilled vertical hole is a concrete structure,
It can be used for foundations of structures such as bridge piers and steel towers, tunnel excavation, vertical shafts for mining, etc. Therefore, the vertical hole is finally finished depending on the application, such as forming a lining, arranging reinforcing bars or steel frames and filling concrete. The casing 124 may be buried.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a starting stand according to the present invention.

FIG. 2 is a sectional view of the starting frame of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

4 is a cross-sectional view taken along line 4-4 of FIG.

FIG. 5 is a front view showing an embodiment of a reaction force receiver.

FIG. 6 is a plan view showing an embodiment of a mounting means for a support and a reaction force receiver.

FIG. 7 is a front view of the attachment means shown in FIG.

FIG. 8 is a front view showing an embodiment of a plate member joining means.

9 is a sectional view taken along line 9-9 of FIG.

10 is a cross-sectional view taken along line 10-10 of FIG.

FIG. 11 is a vertical cross-sectional view showing an embodiment of a vertical hole building device.

12 is a plan view of the construction device shown in FIG. 11. FIG.

13 is a cross-sectional view taken along line 13-13 of FIG.

14 is a vertical cross-sectional view showing an enlarged part of the main body and the first drilling head, which is a cross-sectional view taken along line 14-14 in FIG.

15 is an enlarged vertical cross-sectional view showing another part of the connecting portion between the main body and the first drilling head, which is taken along line 15-15 in FIG.
It is sectional drawing obtained along the line.

FIG. 16 is a plan view showing an embodiment of a second excavation head.

FIG. 17 is a front view showing a part of the second excavation head shown in FIG. 16 in a cutaway manner.

FIG. 18 is a side view showing a part of the second excavating head shown in FIG. 16 in a cutaway manner.

FIG. 19 is an enlarged cross-sectional view showing the vicinity of the cutter assembly of the second excavating head.

20 is a cross-sectional view taken along line 20-20 of FIG.

FIG. 21 is a transverse cross-sectional view showing a state where the pressing body of the moving mechanism is retracted.

FIG. 22 is a transverse cross-sectional view showing a state where the pressing body of the moving mechanism is projected.

FIG. 23 is a vertical cross-sectional view showing the relationship between the pressing body of the moving mechanism and the second jack, in a state where the pressing body is retracted and the second jack is contracted.

FIG. 24 is a right side view of FIG. 23.

FIG. 25 is a cross-sectional view showing an embodiment of a rotation stopping means.

26 is a cross-sectional view taken along line 26-26 of FIG.

[Explanation of symbols]

 10 Starting frame 12 Excavator for vertical hole 14 Frame 16 Strut 18 Reaction force receiver 20 Mounting bolt 46 Plate member 48 Coupling plate 50 Coupling member 54 Coupling plate 56 Female screw member 58 Screw 60 Female screw part 62 Male screw member 64 Plate 66 Spacer 70 Nut for mounting 124 Casing

Claims (6)

[Claims] 1. A frame having an arrangement space for arranging a vertical hole excavator and installed on the ground, and a plurality of struts arranged at intervals around the arrangement space and extending upward from the frame. A cylindrical reaction force receiving means for receiving a reaction force at the time of excavation by the excavator on its inner surface, and the reaction force receiving means can be detached from the column outside the reaction force receiving means in a state where its axis extends in the vertical direction. A mounting base for an excavator for a vertical hole, including mounting means for mounting on the excavator. 2. The starting frame according to claim 1, wherein each of the columns has mounting portions for mounting the reaction force receiving means by the mounting means so as to be removable from each other, at a plurality of positions vertically spaced from each other. 3. The reaction force receiving means is a tubular reaction force receiving body having internal thread portions at a plurality of positions spaced apart in the circumferential direction and the axial direction, and the reaction force receiving means is provided on the outer side of the reaction force receiving means and the strut is provided. The starting frame according to claim 1 or 2, further comprising: a coupling body coupled to the female threaded portion; and a plurality of screw members screwed into the female threaded portion and extending through the reaction force receiver in a radial direction thereof. 4. The mounting means according to claim 3, wherein the mounting means includes a bolt penetrating the connecting body and the support column in an outer surface of the reaction force receiver in a tangential direction, and a nut screwed to the bolt. Starting frame. 5. The starter according to claim 3, wherein the reaction force receiver includes a plurality of arcuately curved plate-shaped members and a plurality of coupling members that couple the plate-shaped members in a tubular shape. Frame. 6. The starting stand according to claim 3, 4 or 5, wherein the plate-shaped members adjacent to each other in the circumferential direction of the reaction force receiver are connected to each other at a plurality of positions in the vertical direction.