JP2981164B2 - Drilling rig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digging apparatus for digging a ground for forming a foundation pile or the like.

[0002]

2. Description of the Related Art In an earth auger apparatus generally used as this type of excavator, a leader is vertically provided by a crawler crane, and an auger machine serving as a rotary driving means is mounted on the reader so as to be able to move up and down. To
A drilling shaft member having a drilling bit at its tip is vertically connected, and the drilling shaft member is rotated by an auger machine to excavate the ground.

[0003]

In an excavator such as the above-mentioned earth auger apparatus, a leader is always required to receive a rotational reaction force when the auger machine is driven. However, when the length of the leader becomes long, it takes a lot of time and effort to move the leader within the construction site, and to carry the leader into and out of the site. In the case of excavating the ground on an inclined ground, when the step between the contact surface of the crawler crane and the contact surface of the leader is large, the length of the leader cannot be increased, and the excavation depth is limited.

SUMMARY OF THE INVENTION In view of the above problems, the present invention makes it possible to excavate the ground without using a leader, thereby improving work efficiency. It is an object of the present invention to provide an excavator capable of making a leader sufficiently long and excavating to a required depth even when there is a considerable step between the excavator and the excavator.

[0005]

According to a first aspect of the present invention, there is provided an excavator having a rotary drive unit 1 supported so as to be able to move up and down, a drill bit 27 at a tip, and a rotary drive shaft below the rotary drive unit 1. Excavation shaft member 2 integrally rotatably connected to 3;
The fixed casing 5 which is fitted over the excavation shaft member 2 and is integrally and vertically connected to the machine frame 6 of the rotary drive device 1 and the fixed casing 5 which is horizontally installed at a predetermined position on the ground to be excavated. A casing rotation preventing member 7 having a casing insertion hole 8 that can be freely inserted in the vertical direction but can prevent rotation of the fixed casing 5.

In use of the excavator, a rotary drive 1 is suspended from a crane boom M via a wire W for raising and lowering, and a fixed casing 5 and a drill shaft 2 The fixed casing 5 is inserted into the casing insertion hole 8 of the casing detent member 7 fixed at a predetermined position (dig hole 18) on the ground in a state where is suspended. By inserting the fixed casing 5 into the casing insertion hole 8 of the casing rotation preventing member 7 in this manner, the fixed casing 5 can be moved in the vertical direction but its rotation is prevented. That is, the rotation driving device 1
Is received by the casing detent member 7. Thus, while the wire W for raising and lowering operation is being extended, the rotation driving device 1 is operated to operate the excavation shaft member 2.
Excavates the ground while rotating.

As described above, the excavator of the present invention is installed horizontally at a predetermined position on the ground to be excavated, and allows the fixed casing 5 to freely penetrate vertically, but prevents the fixed casing 5 from rotating. Since the casing rotation preventing member 7 having the casing insertion hole 8 is provided, the casing rotation preventing member 7 can receive the rotational reaction force of the rotation drive device 1. Therefore, excavation of the ground can be performed without using a leader unlike the conventional apparatus.

According to a second aspect of the present invention, in the excavator according to the first aspect, the fixed casing 5 is formed of a cylindrical casing, and an engaging projection 17 is formed on the outer peripheral surface of the cylindrical fixed casing 5 in a longitudinal direction. The casing rotation preventing member 7 includes a circular hole 8a through which the cylindrical fixed casing 5 can be inserted, and a circular hole 8a.
a, which is recessed in the inner peripheral portion of FIG.
It is provided with.

The invention according to claim 3 is the invention according to claim 1 or 2
In the excavator described in the above, the casing detent member 7
Is formed in the shape of a flat plate and has a hole 1 on the excavated ground.
8 is mounted and fixed on a pair of support members 19, 19 made of a long transversely oriented H-shaped steel laid horizontally on both sides of the support member 8.

According to a fourth aspect of the present invention, in the excavator according to the third aspect, the casing detent member 7 is divided into two parts along a dividing line in a direction orthogonal to a longitudinal direction of the support member 19. Of half-plates 7a and 7b.

[0011] The invention according to claim 5 is the invention according to claim 3 or 4.
In the excavator according to the above, the pair of support members 19,
A plurality of positioning projections 23 for positioning the casing rotation preventing member 7 at the center position between the two supporting members 19, 19 are provided on the upper surface of the
The casing rotation preventing member 7 is provided with an engaging portion 24 with which the positioning protrusion 23 can be engaged.

[0012]

FIG. 1 schematically shows an entire excavator according to the present invention, and FIG. 2 shows an enlarged part of the excavator. In these figures, reference numeral 1 denotes a rotary drive device suspended and supported by a lifting / lowering operation wire W hanging from the tip of a boom M of a crane truck K, and 2 denotes a rotary drive shaft protruding below the rotary drive device 1. A down-the-hole hammer 4 is continuously provided below the excavation shaft member 2. Reference numeral 5 denotes a fixed casing which is fitted over the excavation shaft member 2 and is integrally and vertically connected to a machine frame 6 of the rotary drive device 1.
Is a casing detent member horizontally installed at a predetermined location on the ground to be excavated, and is a casing insertion hole 8 that allows the fixed casing 5 to freely penetrate vertically but prevents rotation of the fixed casing 5. (See FIGS. 4 and 7).

The rotary drive device 1 is similar to an auger machine of an earth auger device. A hydraulic or electric motor or the like is built in a machine frame 6.
As shown in FIG. 1, a skirt-shaped bracket 9 is integrally protruded, and the rotary drive shaft 3 is concentrically protruded in the bracket 9. A pulley 10 on which a lifting operation wire W is mounted is provided at the top of the machine frame 6. An auger machine of an earth auger device may be used as it is for the rotary drive device 1.

The excavating shaft member 2 is composed of, for example, a plurality of cylindrical casing members 11 that can be replenished, and a hollow rotary shaft member 12 is provided above the upper casing member 11.
Are connected coaxially, and an upper end flange portion 12a of the rotary shaft member 12 is joined to the flange portion 3a of the rotary drive shaft 3. A down-the-hole hammer 4 is coaxially connected to a lower portion of the rotary shaft member 12. Have been. In addition, as shown in FIG.
The air introduction path 13 is connected to an external air introduction pipe 15 via an air swivel 14 fitted to the rotary shaft member 12 and is connected to the outside.
As shown in FIG. 2B, the air supply pipe 16 is coaxially arranged in each of the casing members 11, and the driving air is supplied to the down-the-hole hammer 4 by the air supply pipe 16.

The fixed casing 5 is formed of a cylindrical casing. As shown in FIGS. 1 to 3, for example, two engaging projections 17, 17 are provided on an outer peripheral surface of the fixed casing at a predetermined interval in the circumferential direction. Are provided integrally or integrally over the entire length in the longitudinal direction. The number of the protrusions 17 for engagement may be one or more. And the fixed casing 5
Is joined to a lower end flange portion 9a of a skirt-like bracket 9 projecting below the machine frame 6, whereby the fixed casing 5 is integrally fixed to the machine frame 6 of the rotary drive device 1. You. This fixed casing 5
May be so-called one piece integrally formed over the entire length, but is preferably formed of a plurality of fixed casing members that can be connected to each other so that they can be added according to the excavation length of the ground.

Next, the casing detent member 7 will be described with reference to FIGS. 4 to 7. The casing detent member 7 is formed of, for example, a thick iron plate. A circular hole 8a having an inner diameter slightly larger than the outer diameter of the casing 5 and through which the casing 5 can be inserted; Each of the strips 17 has a casing insertion hole 8 formed with an engagement recess 8b that can be inserted therethrough. As shown in FIGS. 4 and 7, the casing detent member 7 is a long, horizontally oriented H that is horizontally laid on both sides of a digging hole 18 (see FIG. 4) on the digging ground. It is mounted and fixed on a pair of support members 19 made of a shaped steel.

Further, the casing detent member 7 is similar to the one shown in FIG.
5, as shown in FIG. 5, along a dividing line in a direction orthogonal to the longitudinal direction of the support member 19 made of a horizontal H-section steel.
It is composed of a pair of divided half plates 7a and 7b, and is placed on the divided end of one half 7a so as to overlap with the divided end of the other half 7b. Connecting piece 20, 2
Reference numeral 0 is fixed by welding, and a plurality of bolt insertion holes 21 and 22 are provided at required portions of each connecting piece 20 and the other half plate 7b overlapping with each other.

On the upper surfaces of the support members 19, 19, as shown in FIGS. 4 and 7, the casing detent member 7 is positioned at the center between the support members 19, 19 in the space direction. For example, four positioning projections 23
Are provided at a predetermined pitch in the longitudinal direction of the support member 19 for each of the excavation holes 18, and the casing rotation preventing member 7 is provided at a required portion of each of the half plates 7 a and 7 b with the positioning protrusions. An engagement portion 24 to which the engagement 23 can be provided is provided. As shown in FIG. 7, the casing rotation preventing member 7 is attached to both the support members 19 and 19 by the positioning protrusions 2.
A bolt hole 26 for bolting with a bolt 25 in a state where it is positioned at a predetermined position by 3 and the engaging portion 24 is provided.

Therefore, in order to fix the casing detent member 7 at a predetermined position on both support members 19, 19 corresponding to the digging hole 18, first, the half plate having no connecting piece 20 is provided. 7b, and the engaging portion 24 is
It is mounted on both support members 19, 19 so as to engage with the positioning projections 23 on the sides 9, 9, and then (actually, during excavation work, the fixed casing 5 is inserted into the casing insertion hole of the half plate 7b). 8), and the other half plate 7a is placed on both supporting members 19, 19 in the same manner as described above (at this time, the casing insertion hole 8 of the half plate 7a is fixed to the fixed casing 5). At the same time, the connecting piece 20 is superimposed on the one half plate 7b so as to be in a state as shown in FIG. 4, and the bolt 25 is moved from the bolt insertion hole 21 of the connecting piece 20 to the half plate. 7b is further inserted into the bolt hole 26 of each support member 19, and a nut (not shown) is screwed and fastened to the insertion end of the bolt, so that the casing detent member 7 is connected to both support members 19, 19 at a predetermined position.

Since the down-the-hole hammer 4 has a well-known structure, a detailed illustration is omitted, but a cylinder is provided inside the hammer main body 4a shown in FIG.
A hammer piston that slides in the cylinder reciprocates by supplying compressed air, and the hammer piston strikes a drill bit 27 projecting to a lower portion of the hammer body 4a. Air for driving the hammer 4 is supplied from the air supply pipe 16 to the cylinder. The down-the-hole hammer 4 is integral with the excavating shaft member 2 and rotates with the rotation of the excavating shaft member 2. As shown in FIG. 2, a down-the-hole hammer 4 is provided at the lower end in the fixed casing 5.
An annular guide 28 rotatably supporting the hammer body 4a is mounted via a plurality of mounting pieces 29.

As shown in FIGS. 2 and 3, an air introduction pipe 15 connected to an air introduction passage 13 in the rotary shaft member 12 is connected to the upper end of the fixed casing 5 from the air swivel 14 through the fixed casing 5. Slot 3 to extend outside
0 is open. In this case, since the air introduction pipe 15 is locked in the long hole 30, the rotation of the air swivel 14 is prevented.

In order to excavate the ground and create a foundation pile by using the excavator having the above-described configuration, first, the rotary driving device 1 is moved from the tip of the crane boom M via the lifting / lowering operation wire W. In a state where the fixed casing 5, the excavation shaft member 2 and the down-the-hole hammer 4 are suspended from the lower part of the rotary drive device 1, the fixed casing 5 is
The casing rotation preventing member 7 fixed at a predetermined position on the pair of support members 19 is inserted into the casing insertion hole 8.

In this case, the casing detent member 7 is
As described above, one of the half plates 7b is moved to the fixed position on both support members 19, 19 by the engaging portion 24 and the positioning protrusion 23.
The fixed casing 5 is inserted into the semicircular casing insertion hole 8 portion (half of the casing insertion hole 8) of the half plate 7b from this state, and the fixed casing 5 side The joint ridge 17 is engaged with the engaging recess 8b on the half plate 7b side, and then the other half plate 7a is fitted to the fixed casing 5 while facing the one half plate 7b. In the same manner as described above,
4 and the positioning projection 23 are engaged with each other and set, the fixed casing 5 is sandwiched between the two half plates 7a and 7b, and the two half plates 7a and 7b are mounted on the support members 19 and 19 by bolts 25. Fasten and fix. In this case, the pair of support members 19, 19 are arranged and fixed on the ground along the arrangement direction of a series of digging holes 18 in the vertical or horizontal direction.

As described above, the fixed casing 5 is
The rotation drive device 1 is moved out of the casing insertion hole 8 of the casing rotation preventing member 7 while being able to move in the vertical direction but being inserted so as to prevent the rotation of the fixed casing. When the excavating shaft member 2 is operated to rotate the excavating shaft member 2 together with the down-the-hole hammer 4, and the down-the-hole hammer 4 is operated to strike the excavating bit 27, the rotary excavating operation of the excavating bit 27 due to the rotation of the excavating shaft member 2 and the down-the-hole hammer The ground is excavated by the impact action of No. 4.

After excavation to a predetermined depth, the supply of air is stopped and the operation of the down-the-hole hammer 4 is stopped, and then the wire W for raising and lowering operation is wound up to move the fixed casing 5 to the excavating shaft member 2 and Then, the grout such as cement milk is injected into the borehole by pulling in a grout hose connected to a grout pump. In this case, a grout introduction path is provided in the rotary shaft member 12 and a grout supply pipe communicating with the grout introduction path is connected to the excavation shaft member 2.
If the grout swivel is used to introduce grout from outside into the grout introduction path, the fixed casing 5 will not be pulled up as described above. Also, the grout can be injected into the borehole immediately after the end of the excavation. After the grouting is completed, a reinforcing pile such as an H-beam and other necessary piles are erected in the borehole filled with the grout to form a foundation pile.

When the excavation work and the grout filling work at one place are completed as described above, the casing detent member 7 is removed from the support members 19, 19, and the casing detent member 7 is detached from the both members. At the next excavated hole 18 along the supporting members 19, 19, the engaging portions 24 are formed in the same manner as described above.
The excavation work and the grouting work are performed by using the and the positioning projections 23, and thereafter, a series of foundation piles is formed in the same manner as described above. The casing rotation preventing member 7
May be removed after the excavation is completed and before the fixed casing 5 is pulled up.

As is clear from the above description, this excavator is installed horizontally at a predetermined excavation point 18 on the ground to be excavated, and allows the fixed casing 5 to freely penetrate vertically. Since the casing rotation preventing member 7 having the casing insertion hole 8 that can prevent the rotation of the casing 5 is provided, the casing rotation preventing member 7 can receive the rotational reaction force of the rotation drive device 1, As a result, excavation of the ground can be performed without using a leader unlike the conventional apparatus.

In the above-described embodiment, the fixed casing 5 is formed of a cylindrical casing, the engaging ridge 17 is provided on the outer peripheral surface thereof in the longitudinal direction, and the casing rotation preventing member 7 is provided. A casing having a circular hole 8a through which the cylindrical fixed casing 5 can be inserted, and an engaging recess 8b recessed in the inner peripheral portion of the circular hole 8a and through which the engaging ridge 17 can be inserted. Although the hole 8 was provided, a rectangular cylindrical casing was used as the fixed casing, and the casing detent member was provided with a rectangular casing insertion hole corresponding to the outer shape of the rectangular cylindrical casing. Is also good. In the case of this embodiment, since the fixed casing 5 is formed of a cylindrical casing, the fixed casing 5 can be easily driven into and pulled out from the ground, and the material cost of the casing is reduced. It is cheaper than a rectangular cylindrical casing.

Then, the casing detent member 7
Since is formed in a flat plate shape, it can be easily and easily manufactured using an iron plate or the like, and is convenient for handling and transportation. The casing detent member 7 is composed of a pair of support members 1 made of a long, horizontally oriented H-shaped steel laid horizontally on both sides of a digging hole 18 on the digging ground.
Since a large number of foundation piles are successively formed in a vertical or horizontal row, the support members 19, 19 are vertically or horizontally aligned because a plurality of foundation piles are sequentially mounted or fixed. By laying along the base 18, after completing the formation of the foundation pile at one excavation point 18, the casing detent member 7 is moved and set at a required pitch along the support members 19, 19 and set. , The fixed casing 5 can be positioned at that position, and thereafter can be similarly positioned, so that the work for forming the foundation pile can be performed extremely efficiently,
A plurality of vertical or horizontal foundation piles can be easily centered.

The casing detent member 7 is composed of a pair of half plates 7a and 7b divided into two along a dividing line in a direction perpendicular to the longitudinal direction of the two support members 19, 19. When the casing detent member 7 is mounted on the supporting members 19, 19, the half plate 7b is disposed at a fixed position on the supporting members 19, 19, and then the fixed casing 5
Is inserted into the casing insertion hole 8 of the one half plate 7b, and then the casing insertion hole 8 of the other half plate 7a is fitted to the fixed casing 5. The work of inserting the fixed casing 5 into the casing insertion hole 8 of the casing 7 can be easily performed.

Further, a plurality of positioning projections 23 for positioning the casing detent member 7 at a center position between the support members 19, 19 are provided on the upper surfaces of the support members 19, 19.
Are projected at a predetermined pitch in the longitudinal direction of the support member 19 for each excavation point 18 and the casing rotation preventing member 7 is provided with an engaging portion 24 with which the positioning protrusion 23 can be engaged. In the case where the positioning of the casing detent member 7 on the support members 19, 19 can be performed quickly and easily, whereby the construction can be performed more efficiently, and a large number of foundation piles are sequentially formed in a vertical or horizontal shape. The pile cores of a plurality of vertical or horizontal foundation piles can be accurately matched.

In the above-described embodiment, the rotary drive 1
The example in which the excavation shaft member 2 is connected to the rotary drive shaft 3 and the down-the-hole hammer 4 is further provided below the excavation shaft member 2 has been described, but the down-the-hole hammer 4 is not used, and the excavation shaft member is grounded. An auger screw used in an auger device may be used, and the auger screw may be connected to the rotary drive shaft 3 of the rotary drive device 1. In short, the rotary drive shaft 3 of the rotary drive 1
The drilling shaft member to be connected to the base member may be a drilling shaft member used for excavating the ground, and may be, for example, a cylindrical rotary casing having a drilling bit at a tip.

Further, the casing detent member 7 is not limited to the above-described plate-shaped member, and a supporting part for horizontally supporting the casing detent member 7 on the ground is integrated with the detent member 7. The formed structure may be used.

[0034]

According to the first aspect of the present invention, there is provided a drilling device including a rotary drive device supported to be able to move up and down, and a drill bit.
An excavation shaft member interlockingly connected to a rotary drive shaft at the lower portion of the rotary drive device, and is installed horizontally at a predetermined drill hole on the excavation ground, and allows the fixed casing to freely penetrate vertically, but rotates the fixed casing. Since it has a casing detent member formed with a casing insertion hole for blocking,
The casing anti-rotation member can receive the rotational reaction force of the rotary drive device, thereby excavating the ground without using a leader as in the conventional device, and therefore various types of operation accompanying the use of the leader are possible. The problem can be solved.

According to the second aspect of the present invention, the fixed casing is formed of a cylindrical casing, so that the fixed casing is easily driven into and out of the ground, and the material cost of the casing is smaller in the case of the cylindrical casing. It is cheaper than a cylindrical casing.

According to the third aspect of the present invention, since the casing detent member is formed in a flat plate shape, it can be easily and easily manufactured using an iron plate or the like, and is convenient for handling and transportation. Further, the casing detent member is mounted and fixed on a pair of support members made of a long transversely shaped H-shaped steel laid horizontally on both sides of the excavated ground on the excavated ground. Therefore, in the case where many foundation piles are sequentially formed in a vertical or horizontal row, by laying both support members along the vertical or horizontal drill holes, one excavation is performed. After completing the formation of the foundation pile at the hole, the casing detent member is moved and set at a required pitch along both support members, and the fixed casing can be positioned at that position. Therefore, it is possible to extremely efficiently perform the work of forming the foundation pile, and it is possible to easily perform the centering of the plurality of vertical or horizontal foundation piles.

According to the fourth aspect of the present invention, the casing detent member is formed of a pair of half plates divided into two along a dividing line in a direction orthogonal to the longitudinal direction of both support members. In mounting the stop member on the support member, one half plate is disposed at a fixed position on the support member, and then the fixed casing is inserted through the casing insertion hole of the one half plate, and then the other half plate is inserted. By fitting the casing insertion hole portion of the split plate into the fixed casing, the work of inserting the fixed casing into the casing insertion hole of the casing rotation preventing member becomes easy.

According to the fifth aspect of the present invention, a plurality of positioning projections for positioning the casing detent member at the center position between the two support members are provided on the upper surface of the two support members for each of the excavation holes. The casing detent member is provided with an engaging portion with which the positioning protrusion can be engaged, so that the casing detent member can be quickly and easily positioned on both support members. It is possible to perform the construction more efficiently, and when many foundation piles are formed sequentially in a vertical or horizontal row, the pile cores of multiple vertical or horizontal foundation piles can be accurately positioned. Can be matched.

[Brief description of the drawings]

FIG. 1 is an overall side view showing an excavator according to the present invention.

FIG. 2 is a partially enlarged side view of the excavator.

3A is a sectional view taken along line XX of FIG. 2, FIG.
FIG. 3 is a sectional view taken along line YY of FIG. 2.

FIG. 4 is a plan view showing a casing detent member mounted on a support member.

FIG. 5 is a plan view showing a pair of half plates forming a casing detent member separated from each other.

FIG. 6 is a front view of the two halves shown in FIG. 5;

FIG. 7 is a perspective view showing a pair of support members, a casing detent member mounted and fixed on the support member, and a fixed casing inserted into a casing insertion hole of the casing detent member.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rotary drive 2 excavating shaft member 3 rotary drive of rotary drive 4 down-the-hole hammer 5 fixed casing 6 machine frame of rotary drive 7 casing detent member 7a half plate 7b half plate 8 casing insertion hole 8a circular hole 8b Engagement recess 9 Bracket 19 Support member 23 Positioning projection 24 Engagement part 27 Drilling bit K Crane truck M Boom W Elevating operation wire

Continuation of the front page (56) References JP-A-7-238766 (JP, A) JP-A-58-16289 (JP, U) JP-A-53-108104 (JP, U) JP-A-2-50487 (JP, A) , U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21B 3/00 E21B 7/00

Claims (5)

(57) [Claims] A rotary drive device supported so as to be movable up and down;
A drilling shaft member having a drilling bit at its tip and integrally rotatably connected to a rotary drive shaft at the lower portion of the rotary drive device; A fixed casing to be connected and a casing having a casing insertion hole which is horizontally installed at a predetermined place on the ground to be excavated and which allows the fixed casing to freely penetrate vertically but prevent rotation of the fixed casing. A drilling device comprising: a stopping member. 2. The fixed casing comprises a cylindrical casing, and an engaging ridge is provided on the outer peripheral surface of the cylindrical fixed casing over the entire length in the longitudinal direction. And a casing insertion hole comprising a circular hole through which the fixed casing can be inserted, and an engagement recess formed in the inner periphery of the circular hole and through which the engagement ridge can be inserted. Item 1. The excavator according to Item 1. 3. The casing detent member is formed in a flat plate shape and has a pair of support members made of a long transversely oriented H-section steel laid horizontally on both sides of a digging hole on the digging ground. The excavator according to claim 1, wherein the excavator is mounted and fixed on a member. 4. The excavator according to claim 3, wherein the casing detent member is composed of a pair of half plates divided into two along a dividing line in a direction orthogonal to a longitudinal direction of the support member. 5. A plurality of positioning protrusions for positioning a casing detent member at a center position between the two support members on an upper surface of the pair of support members at a predetermined pitch in a longitudinal direction of the support member for each digging hole. The excavator according to claim 3, wherein the excavating device is provided with an engaging portion which is provided so as to be engageable with the positioning protrusion.