JP2000291361A - Vertical hole digging method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical hole digging method capable of efficiently discharging soil and sand inside a large diameter casing in the vertical hole digging method in which the casing is held through a small diameter adapter for digging. SOLUTION: A vertical hole digging device comprises an adapter 4 having a small diameter, long holding part and capable of connecting a large diameter casing, a main band 5, a main band 5, a rotatably driving device to rotatably drive the main band 5, a thrust cylinder 6 to raise and lower the main band 5, and a sub band 9. After the vertical hole digging device is mounted on a frame 3 movably in lateral direction, the main band 5 on which the holding part of the adapter 4 is held is rotated and lowered while the holding part is passed appropriately from one hand to the other so as to press the casing 2-2 into the ground. Next, after the adapter 4 is separated from the casing 2-2, while the main band 5 is passed from one hand appropriately to the other in association with the sub band 9, the adapter 4 is raised, and then the shaft digging device is moved horizontally so that, for soil exhaustion, a hammer grab 15 can enter directly into the casing 2-2 without passing through the adapter 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical hole provided with an adapter, a gripping device which can be gripped by inserting the adapter, a rotary drive device which can rotationally drive the gripping device, and a lifting drive device which can raise and lower the gripping device. The present invention relates to a vertical hole excavation method for excavating a vertical hole having a larger diameter than a casing that can be gripped by a gripping device, using an excavator.

[0002]

2. Description of the Related Art Tubular casings (hereinafter simply referred to as "casings") for large-diameter steel pipe piles and steel pipes used in civil engineering and construction work.
That. 2. Description of the Related Art As a device for excavating a vertical hole by forcing a vertical hole into the ground and discharging earth and sand in a casing, a vertical hole excavation device called a casing driver has been generally known. The casing driver has a rectangular frame-shaped base frame, a gripping device such as a casing gripping band that inserts and grips the casing, and a rotation driving device including a hydraulic motor or the like that rotationally drives the gripping device. Normally equipped with an elevating frame that is installed on a base frame so as to be able to move up and down and has a gripping device and a rotary drive device attached thereto, and an elevating drive device such as a thrust cylinder that raises and lowers the elevating frame and raises and lowers the gripping device together with the rotary drive device ing. Then, the casing is gripped by the gripping device, the gripping device is rotated by the rotary drive device, lowered by the elevating drive device, the casing is pushed into the ground, and the earth and sand in the casing is discharged by a digging tool such as a hammer grab. It is configured to excavate a vertical hole.

[0003] However, in such a conventional general vertical hole excavator, if the diameter of the casing gripped by the gripping device is slightly larger than the maximum diameter that can be gripped, the vertical hole cannot be drilled by using the same. In such a case, a vertical hole excavator that can be inserted and gripped even with such a large-diameter casing may be used.However, not only the outer shape of the entire vertical hole excavator becomes very large, but also the price becomes expensive, and furthermore, In other words, the existing drilling rig cannot be used effectively.

[0004] As a vertical hole excavator to cope with such a problem, a technique called a large diameter vertical hole excavation method and a large diameter vertical hole excavation apparatus has recently been proposed in Japanese Patent Laid-Open No. 5-202687. The vertical hole drilling device in this conventional technology is obtained by adding a cylindrical adapter to the above-described conventional general vertical hole drilling device, and this cylindrical adapter can be used in a gripping device even if it is not a special standard vertical hole drilling device. A relatively small diameter is formed so as to be able to be inserted and grasped, and a connecting portion capable of connecting a large diameter casing is provided at a lower end portion.

On the other hand, the vertical hole drilling method according to this conventional technique proposes a method of using such a vertical hole drilling device. The vertical hole drilling device is provided with a work space for installing a casing below, and can be moved laterally. In the state of being set on the gantry, the small-diameter cylindrical adapter is attached to the large-diameter casing and gripped by the gripping device. While pushing through the small adapter into the ground while rotating through a cylindrical adapter, a drilling tool such as a hammer club is raised and lowered in the casing through a small-diameter tubular adapter to excavate and discharge earth and sand in the casing, thereby excavating a vertical hole. Like that. Then, when one unit casing is pushed in, the adapter is separated from the casing and raised by the elevating drive device, then the vertical hole excavator is moved in the horizontal direction, and then a new unit casing is added to the already pushed-in casing. The drilling rig is then moved back to its original position and then the adapter is connected to the new casing.

[0006]

According to the conventional method of excavating a vertical hole, a conventional vertical hole without using an adapter is used for excavating and discharging earth and sand in a casing pushed into the ground. In accordance with the excavation method, a drilling tool such as a hammer grave is inserted from above the vertical hole drilling apparatus. For this reason, the drilling tool is raised and lowered in the casing via the inside of the adapter. However, in such a conventional pit excavation method, the casing having a diameter larger than the diameter that can be gripped by the gripping device is gripped via the small-diameter adapter, so that the drilling tool can pass through the small-diameter adapter. It is necessary to use a small one for the diameter of the casing, limited to a contoured one. Therefore, when the excavation tool is operated with a normal operation feeling when the earth and sand in the casing is discharged by operating the excavation tool, only the relatively small area in the center of the casing can be discharged, and the casing is discharged. There is a problem that the earth and sand in the peripheral portion is left undigged. When discharging the earth and sand around the casing, since the diameter of the adapter is smaller than that of the casing, the radial movement range of the wire rope suspending the digging tool is limited as compared to when the adapter is not used. As a result, the degree of freedom of the operation of the excavator is restricted, and it becomes extremely difficult to perform the earth removal work. As described above, in the conventional technology, a great deal of time is required for the earth discharging operation, and the working efficiency is reduced.

[0007] The technical problem of the present invention is to solve such a problem found in the prior art, and a pit excavator for gripping a casing having a larger diameter than a grippable diameter through a small-diameter adapter is provided. In a vertical hole excavation method for excavating a vertical hole, an object of the present invention is to provide a vertical hole excavation method capable of efficiently discharging earth and sand in a casing.

[0008]

The technical object of the present invention is achieved by the following method.

An adapter having a gripping portion and a lower end provided with a connecting portion capable of connecting a casing having a larger diameter than the gripping portion, a gripping device capable of gripping the adapter by inserting the gripping portion, and rotating the gripping device Vertical drilling device equipped with a rotary drive device capable of lifting and lowering a gripping device installed on a base frame and provided with a work space for installing a casing below, and movably mounted in a horizontal direction. , The adapter is gripped by the gripping device and connected to the casing,
In a vertical hole excavation method in which a vertical hole is excavated by rotating a gripping device by a rotary drive device, lowering the vertical drive with a lifting drive device, pushing a casing into the ground, and discharging earth and sand in the casing, a vertical hole drilling method is used. In the process of connecting the adapter to connect the connecting portion of the adapter to the casing installed in the work space for installing the casing and holding the casing, and rotating the gripping device to lower the casing to push most of the casing into the ground. Pushing process, separating the adapter from the casing, raising the adapter to a position suitable for moving the vertical hole drilling device in the horizontal direction, and moving the vertical hole drilling device in the horizontal direction to remove the adapter An excavation process to excavate and discharge the earth and sand in the casing with an excavator, Replenishment to grayed, so as to excavate a vertical hole by carrying out a connection process of the casing to be moved based on the position of the longitudinal hole drilling apparatus.

In the prior art, at the stage from the end of the casing pushing-in step to the start of the adapter raising step, a digging tool such as a hammer club is inserted into the casing via the adapter, and the earth removal work is performed. Had been
In the vertical hole excavation method of the present invention, the lifting process of the adapter is performed after the completion of the pushing process of the casing, and thereafter, for the first time, the discharging process for performing the discharging operation is performed. In this earth removal process, the vertical hole excavator holding the adapter is moved in the horizontal direction, and the earth and sand in the casing is excavated with an excavating tool such as a hammer grab. As described above, in the present invention, since the vertical hole excavator is moved in the horizontal direction before the earth discharging operation, the earth excavating tool is directly inserted into the casing having a larger diameter than the adapter to perform the earth discharging operation. This eliminates the need to insert into a casing via a small-diameter adapter as in the related art. for that reason,
The vertical hole drilling method of the present invention, while using an adapter, is not restricted by the size of the excavator and the degree of freedom of operation due to the small diameter of the adapter, so that the normal vertical hole drilling without using the adapter is performed. As in the case where the soil is removed by the law, the earth and sand in the casing can be efficiently discharged. After the earth and sand in the casing are discharged in this manner, in the connecting step of the casing, the joining casing is added to the underground casing, so that the casing pushing-in step can be continued.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be clarified by describing how the present invention is actually embodied with reference to FIGS. FIG.
FIG. 2 shows an example of a vertical hole drilling apparatus used in the vertical hole drilling method of the present invention and shows a situation at the time of execution of a soil discharging step, FIG.
1 is a cross-sectional view taken along line AA of FIG. 1, FIG. 3 is an enlarged view of the vertical hole excavator of FIG.
FIG. 4 is a diagram for explaining a construction procedure of a vertical hole excavation method according to an embodiment of the present invention.

A vertical hole drilling apparatus used in the vertical hole drilling method according to the present invention has an adapter having a grip portion and a lower end portion provided with a connecting portion capable of connecting a casing having a larger diameter than the grip portion, and the grip portion of the adapter is inserted. A gripping device capable of holding the gripping device, a rotary driving device capable of rotationally driving the gripping device, and a lifting drive device installed on the base frame and capable of lifting and lowering the gripping device, holding the adapter with the gripping device and attaching the adapter to the casing. It is to excavate a vertical hole by connecting and lowering with a lifting drive while rotating the gripping device with a rotary drive and pushing the casing into the ground and discharging the earth and sand inside the casing, The function is the same as that of the large-diameter shaft excavator according to the above-mentioned prior art provided with a tubular adapter.

1 to 4, reference numeral 2-1 denotes an excavating cutter 1 provided at a front end portion, and a joint casing 2 described later at a rear end portion.
-2 and a tip casing for excavation with a ground provided with a joint 2a for connecting to the adapter 4, 2-2, 2-3 ...
2-n is a joint casing provided with a similar joint 2a at the rear end and successively added to the front casing 2-1. Each of these casings 2-1 to 2-n is called a unit casing, and is usually formed to the same length.
The casing includes a tip casing 2-1 and a plurality of joint casings 2-2 to 2-n.
By adjusting the number of joint casings 2-2 to 2-n added to 1, the total length of the casing 4 to be built in the ground is adjusted. In this specification, these casings 2
Reference numbers 2 are used when -1 to 2-n are not particularly distinguished or when they are collectively referred to. In this example, each unit casing 2 is formed to have the same unit length.
It is not always necessary to form all of them in the same length. For example, the tip casing 2-1 or the joint casing 2-n to be built last is made longer or shorter than the other so as to have a different length. It may be formed.

In this vertical hole drilling method, unlike a conventional technique, a casing longer than the stroke of the lifting drive device can be used in a vertical hole drilling method in which a large-diameter casing is pushed by using an adapter. .
Therefore, the unit casing 2 is formed not only in a large diameter that cannot be gripped by an adapter gripping device (for example, a main band 5 for gripping an adapter to be described later), but also has a length different from that of the related art in the lifting and lowering drive. It is formed longer than the distance of one stroke of the device (for example, a thrust cylinder 6 described later). Even if not all of the unit casings 2 are formed as long as this, as long as there is at least one such long casing, the advantage of the vertical hole drilling method can be exhibited.

Reference numeral 3 denotes a gantry on which a vertical hole drilling device is installed so as to be movable in the horizontal direction. As shown in FIG. 2, a pair of rail-like members 3a, 3a, 3b. The gantry 3 is provided with a horizontal moving device 12 such as a hydraulic jack that pushes and pulls the vertical hole drilling device by expanding and contracting. Since the casing 2 has a large diameter as described above, and it is difficult to install the casing 2 in a state of being inserted through the gripping device of the adapter, when the gantry 3 is installed, the casing 2 is set upright. It is necessary to provide a work space 21 for installing a casing, which can be installed at a height. In this example, a basement is constructed to provide such a work space 21 underground. By providing the work space 21 in the basement in this way, even when the vertical hole excavation work is performed using the long unit casing 2, the vertical hole excavator can be installed at a relatively low position, and the The vertical hole excavation work can be performed safely, and various operations associated with the vertical hole excavation can be performed at a low position, so that the work is convenient. When excavating a vertical hole with the vertical hole excavator, the crane 14 for excavating the vertical hole for transferring the casing 2 and the like, and the earth and sand in the tip casing 2-1 built in the ground, as in the ordinary all casing method. Is installed for excavating and carrying the ground to the ground.

The equipment associated with the vertical hole drilling device has been described above. Next, the vertical hole drilling device will be described. Reference numeral 4 denotes an adapter having a holding portion 4a and a lower end provided with a connecting portion 4b capable of connecting the casing 2 having a larger diameter than the holding portion 4a. Reference numeral 5 denotes a main grip for holding the adapter capable of holding the holding portion 4a of the adapter. A main band 6 for gripping an adapter as a device is mounted on a base frame 10 and raises and lowers an elevating frame 7 to be described later, and raises and lowers the main band 5 rotatably supported by the elevating frame 7. A thrust cylinder 7 as an apparatus is an elevating frame provided with a slewing bearing that is rotationally driven by a hydraulic motor 8, and the main band 5 is rotatably connected on the slewing bearing. Reference numeral 8 denotes a hydraulic motor that rotationally drives the main band 5, and reference numeral 9 denotes an adapter grip as an auxiliary grip device for gripping the adapter, which is disposed so as to grip the grip portion 4a of the adapter together with the main band 5 for gripping the adapter. The sub-band 10 is a substantially rectangular frame-shaped base frame which has a space for inserting the casing 2 in the center and forms the base of the vertical hole drilling device. The numeral 11 denotes the mounting of the vertical hole drilling device when the vertical hole drilling device is installed on the gantry 3. Support frame 13
Is a horizontal adjustment device provided at the bottom of the base frame 10 to adjust the posture of the vertical hole drilling device horizontally when the vertical hole drilling device is mounted on the support frame 11; It is a positioning tool for fixing and positioning.

In order to push the casing 2 longer than the stroke of the thrust cylinder 6, an adapter 4 is required.
Is different from the prior art described above in that
The gripping portion 4a has a margin 4c in the gripping portion 4a for moving the main band 5 in the vertical direction (longitudinal direction of the adapter 4) when the main band 5 is inserted through the main band 5 and the sub-band 9 for gripping the adapter. Is formed longer. The length of the extra portion 4c of the grip portion 4a is set so that the sum of the length of the extra portion 4c and the stroke of the thrust cylinder 6 is equal to or longer than the length of the casing 2. In the example shown here, the adapter 4 is formed to have the same diameter as the grip portion 4a so that the upper end can be inserted from below into the main band 5 and the sub-band 9 for gripping the adapter.
In such a configuration, the adapter 4 can be made detachable from the vertical drilling rig, and can be separated from these bands 5 and 9 as necessary. Therefore, the vertical hole excavator can be transported to the work site with the adapter 4 removed, which is convenient for transportation. In addition, during the vertical hole excavation work, the removed adapter 4 is used.
Can be easily attached to the vertical hole excavator without requiring a large-scale attaching operation, as described later.

On the other hand, the connecting portion 4b of the adapter is connected to the casing 2 having a large diameter, as in the prior art.
It is formed in a conical shape extending downward. The adapter 4 may be divided and formed so that the lower part provided with the conical connecting portion 4b extending downward can be separated from the upper part. In the case of such a structure, the adapter 4 can be removed and transported as well as divided and transported when transporting the vertical hole excavator to the work site, so that transportation is further improved. In addition, when the adapter 4 is divided and formed in this manner, the adapter 4 exhibits such effects. In addition, during the drilling work of a vertical hole, the upper part and the lower part of the divided adapter 4 are gripped by the adapter. By inserting the adapter 4 from above and below the main band 5 and the sub-band 9, the detached adapter 4 can be easily attached to the vertical hole excavator without requiring a large-scale attachment work.

The main band 5 and the sub-band 9 for gripping the adapter have a plurality of band members and a cylinder pivotally connected to each other with pins, and push the plurality of band members against the adapter 4 by driving the cylinder. It can be applied and gripped. In this example, as shown in FIG. 2, the main band 5 for gripping the adapter is composed of one fixed band member 5a and a pair of pivotally connected pivotally connected ends of the fixed band member 5a. It comprises a movable band member 5b and a hydraulic cylinder 5c pivotally connected to and connected to both ends of each movable band member 5b on the non-connection side. Therefore, when the hydraulic cylinder 5c is driven to contract, the two movable band members 5b are tightened around the fixed band member 5a, pressed against the adapter 4, and can be gripped. There are various types of gripping bands of this kind, which are well known in the art, and a detailed description thereof will be omitted. The sub band 9 for grasping the adapter is attached to the base frame 10 in a state where the sub band 9 is arranged below the main band 5 for grasping the adapter. As the sub-band for gripping the adapter, a sub-band that is manufactured as a product separate from the vertical hole drilling device and that can be detachably attached to the base frame 10 may be used. That is, the vertical hole excavator is connected to the support frame 1.
It is also possible to use a device that is formed in a form that can be accommodated in a space created below the base frame 10 when supported on the horizontal adjustment device 13 and that is provided with mounting means that is detachably attached to the base frame 10.

The thrust cylinder 6 is mounted on the base frame 1
The main band 5 for gripping the adapter can be raised and lowered by extending and retracting the elevating frame 7 by extending and contracting the base band 10 and the elevating frame 7. A main band 5 for gripping the adapter is rotatably attached to the lifting frame 7 via a swivel bearing, and the rotation of the hydraulic motor 8 is transmitted to the main band 5 for gripping the adapter at a reduced speed. . The hydraulic motors 8 are installed on the left and right of the lifting frame 7. In this example, the hydraulic motor 8 and the slewing bearing constitute a rotary drive device for rotating the main band 5 for gripping the adapter. The support frame 11 is provided with rollers 11a for rolling the pair of rail-shaped members 3a, 3b of the gantry 3 in front, rear, left and right. The horizontal adjustment device 13 is composed of horizontal adjustment jacks attached to the four corners of the bottom surface of the base frame 10, and the expansion and contraction thereof can adjust the horizontality of the base frame 10 so that the casing 2 can be built vertically. The positioning device 16 includes a pin hole provided in a bracket on the gantry 3 side, a pin hole provided in the support frame 11, and a pin inserted into these holes. Then, after the support frame 11 is moved by the horizontal moving device 12 so that the pin holes of the support frame 11 coincide with the pin holes of the gantry 3, when the pins are inserted through these pin holes, the position does not shift even during the excavation work. As described above, the vertical hole excavator can be fixedly positioned at a predetermined position for performing an excavation operation. In addition, by performing such positioning, the attachment and detachment of the adapter 4 can be easily performed.

In the example shown here, a main gripping device 18 for gripping the casing 2 which can grip and raise and lower the casing 2 so that the casing 2 pushed into the ground can be efficiently recovered as required. A casing collecting device provided with a sub-gripping device 17 for gripping the casing, which is disposed below the casing 2 and is capable of gripping the casing 2, is provided as an attachment to the above-described vertical hole drilling device. Like the main band 5 and the sub-band 9 for gripping the adapter, the main gripping device 18 and the sub gripping device 17 have a plurality of rotatably pivoted band members and a cylinder. The cylinder 2 can be pressed against the casing 2 and gripped by driving the cylinder. The main gripping device 18 for gripping the casing is attached to a hydraulic cylinder 19 for raising and lowering the main gripping device, which has the same function as the thrust cylinder 6, so that it can be moved up and down by expansion and contraction. These gripping devices 17, 18
The hydraulic cylinder 19 is installed on a base such as the base frame 10 or the support frame 11 having a casing insertion space at the center, and is integrally configured as a unit. Has become.

A vertical hole excavation method for excavating a vertical hole using the above-described vertical hole drilling apparatus or equipment will be described.

When starting the excavation of the vertical hole, the gantry 3
After the vertical hole digging device is installed via the support frame 11, the posture of the vertical hole digging device is horizontally adjusted by the horizontal adjustment device 13 so that the casing 2 can be vertically built. Thereafter, the tip casing 2-1 is installed in the casing installation work space 21. In the preparation process of the excavation work, the adapter 4 is inserted through the main band 5 and the sub-band 9 for gripping the adapter in addition to such work. Do the work.
That is, in this example, the adapter 4 is configured to be detachable from the vertical hole drilling device as described above, and the main band 5 and the sub-band 9 for gripping the adapter when the vertical hole drilling device is transported to the work site. In order to transport the adapter 4 in a state of being separated from the band 5, the work of inserting the separated adapter 4 into these bands 5 and 9 is performed. In this case, since the adapter 4 is provided with a connecting portion 4b for connecting the large-diameter casing 2 below the adapter 4, it is difficult for the adapter 4 to be suspended from above the main band 5 by the crane 14 and inserted therethrough. For this reason, in this example, an adapter having a shape different from that of the related art that can be inserted from below into the main band 5 and the sub band 9 for gripping the adapter is used as the adapter, and the adapter 4 is attached to these bands 5 and 9. The insertion operation is performed by the following method together with the installation operation of the tip casing 2-1.

(Preparation process for excavation work) First, the vertical excavator was moved laterally so as to open the work space 21 for casing installation by contracting the horizontal moving device 12, and then the movement was caused by the movement. The adapter 4 is transferred and carried into the work space 21 by the crane 14 using the upper opening portion 22, and is fixed at an appropriate place. Next, the vertical hole excavator is moved to the place where the adapter 4 is fixed by extending the horizontal moving device 12, and then the adapter 4 is lifted by the crane 14 so that the adapter 4 is held by the sub band 9 for gripping the adapter and the main band. Insert the band 5 from below. Next, after the vertical hole excavator is lifted to an appropriate position that does not hinder the movement of the vertical hole excavator in the horizontal direction, the grip portion 4 a of the adapter is gripped by the main band 5. Thereafter, the tip casing 2-1 is installed in the casing installation work space 21. In this case, similarly, after moving the vertical hole excavator in the horizontal direction, the tip casing 2
-1 is a work space 21 for installing a casing by the crane 14.
Then, the vertical hole excavator is moved to a position where the vertical hole excavation work is performed, and is fixed by the positioning tool 16 so as not to move.

In the case where the above-mentioned divided adapter is used for the adapter 4, the adapter 4 can be inserted into the main band 5 and the sub-band 9 for gripping the adapter by various methods. An appropriate method may be selected according to the shape of the band 4 and inserted into these bands 5 and 9. For example, when the adapter 4 shown in the figure is divided and formed, the adapter 4 is integrally connected, and then the adapter 4 is inserted from below the bands 5 and 9 by the above-described method. Further, as described above, the upper part and the lower part of the adapter 4 can be inserted from above and below the bands 5 and 9, respectively. After completing the preparation process of the excavation work described above, the next first operation for pushing in the tip casing 2-1 and continuing the pushing work of the joint casing 2-2 added thereto is continued.
A series of steps from the step to the seventh step is performed. These steps are also applied when the joint casing is pushed in and connected to a subsequent joint casing. (First Step) The joint 2a of the tip casing 2-1 installed in the work space 21 in the preparation process of the excavation work while raising and lowering the main band 5 for gripping the adapter to adjust the vertical position of the adapter 4. Adapter connecting part 4
b. In this example, since the end casing 2-1 is longer than the stroke of the thrust cylinder 6, when the connecting portion 4b of the adapter is connected to the end casing 2-1 in this manner, the main band 5 for gripping the adapter rises. In a state where the thrust cylinder 6 is extended to the limit, the grip portion 5a of the adapter is gripped by the main band 5, leaving a margin 4c above.

(Second Step) In this state, the main casing 5 for gripping the adapter is lowered by gradually rotating the thrust cylinder 6 while rotating the main band 5 by the hydraulic motor 8 of the rotary driving device, thereby lowering the end casing 2-1. Push the cylinder about the stroke of the thrust cylinder 6 into the ground.

(Third Step) When the thrust cylinder 6 has contracted to a substantially limit, the grip of the adapter 4 by the main band 5 for gripping the adapter is released. At this time, the tip casing 2-1 is supported in contact with the excavated ground and is not normally settled. However, if the ground is extremely soft and there is a possibility of sinking, the main band for gripping the adapter is used. Before releasing the grip of the adapter 4 at 5,
It is preferable to hold the adapter 4 with a sub-band 9 for holding the adapter. After releasing the gripping of the adapter 4 by the main band 5 for gripping the adapter, the main band 5 for gripping the adapter is raised by extending the thrust cylinder 6, and the gripping portion 4a of the adapter is gripped again by the main band 5. Thereafter, the main band 5 is lowered while being rotationally driven, and the tip casing 2-1 is pushed into the ground. These operations are performed according to the length of the tip casing 2-1.
More than once, the tip casing 2-1 is pushed in so that most of the tip casing 2-1 is buried in the ground.

(Fourth Step) Thus, the tip casing 2
After pushing in the first casing 2-1, it is necessary to discharge the earth and sand in the front end casing 2-1 and further to connect the joining casing 2-2 to this, and to add the fourth casing as a preliminary step. And the following fifth step are performed. In this fourth step, first, the connecting portion 4 to the joint 2a
b, the adapter 4 is separated from the tip casing 2-1. Thereafter, the adapter 4 is extended while the thrust cylinder 6 is gripped by the main band 5 for gripping the adapter. About the stroke of

(Fifth Step) After the end of the fourth step, the adapter 4 is gripped by the sub-band 9 for gripping the adapter so as not to fall down, and then the adapter 4 is moved to the main band 5 for gripping the adapter. Is released, and the main band 5 is lowered. Next, after gripping the grip portion 4a of the adapter with the main band 5, the grip of the adapter 4 with the sub band 9 for gripping the adapter is released, and the main band 5 for gripping the adapter is raised again. More than once, the adapter 4 is raised to a position suitable for moving the well drilling rig laterally.

(Sixth Step) After the completion of the fifth step, the horizontal excavator is moved laterally so as to open the working space 21 for installing the casing by contracting the horizontal moving device 12. Using the upper opening portion 22 generated by the movement, the hammer grave 15 is directly put into the tip casing 2-1 from above, and the earth and sand in the tip casing 2-1 is excavated by the hammer rub 15 and discharged to the ground.

(Seventh Step) After the earth removal operation is completed, the joint casing 2-2 is loaded into the work space 21 by the crane 14 by using the upper opening part 22, and the joint casing is placed underground. To the tip casing 2-1.
Next, by extending the horizontal moving device 12, the vertical hole excavator is moved to the original position, that is, the position for performing the vertical hole excavation work, and is accurately positioned at a predetermined position with the positioning tool 16 (after that, the work space 21 in this process). The process returns to the first step again in order to connect the adapter 4 to the joint casing 2-2 provided in the second step.)

As described above, the tip casing 2-1 is pushed in, the earth and sand in the pushed-in tip casing 2-1 is excavated and discharged, and the joining casing 2-2 added to the tip casing 2-1 is pushed. A series of steps for enabling continuation is completed. Next, a step of pushing the joint casing 2-2, a step of excavating and discharging earth and sand inside the joint casing 2-2, and a step of continuing the pushing operation of the joint casing 2-3 added to the joint casing 2-2 are described. In this case, the leading end casing 2-1 is connected with the casing 2
-2, and the above-described first to seventh steps are performed again.

FIG. 4 shows a state in which these steps are performed on the joint casing 2-2.
The point is described. First, in the first step for pushing the joint casing 2-2, the joint casing 2-2 which has been added to the front end casing 2-1 in the seventh step and has already been installed in the casing installation work space 21. The connecting portion 4b of the adapter is connected to the adapter, and the gripping portion 4a of the adapter is gripped by the main band 5 for gripping the adapter, leaving a margin 4c above. Here, when connecting the connecting portion 4b of the adapter to the joint casing 2-2, the positioning tool 16 is provided to accurately position the vertical hole excavator at a predetermined position in the seventh step. The connection work of both can be performed efficiently without the need for complicated centering for connection to the joint casing 2-2. FIG. 4A shows the state after the completion of the first step.

Next, in the second step, in such a state, the main band 5 for gripping the adapter is lowered while being rotationally driven to push the joint casing 2-2 into the ground. In the third step, the main band 5 for gripping the adapter is used.
After the grip of the adapter 4 is released, the main band 5 is lifted, the upper part of the grip portion 4a of the adapter is gripped by the main band 5, and the main band 5 is lowered while being driven to rotate, so that the joint casing 2 is rotated. -2 is pushed into the ground, and such an operation is performed one or more times according to the length of the joint casing 2-2, and the joint casing 2-2 is pushed into the ground for a longer distance than the stroke of the thrust cylinder 6.
Then, the joint casing 2-2 is pushed into the ground by a distance corresponding to the length thereof, and most of the joint casing 2-2 is buried in the ground. FIG. 4B shows the state after the completion of the third step. In the prior art, at this stage, a drilling tool such as a hammer grab 15 is inserted from above into a vertical hole drilling device in accordance with a normal vertical hole drilling method, and is inserted into a joint casing 2-2 through a small-diameter adapter 4. , Joint casing 2-2
The earth and sand inside is excavated and excavated with a drilling tool, but this vertical hole excavation method does not use such common sense methods.

After the joint casing 2-2 is pushed into the ground, the adapter 4 is separated from the joint casing 2-2 and raised in a fourth step. Thereafter, in the fifth step, after the adapter 4 is gripped by the sub-band 9 for gripping the adapter, the gripping of the adapter 4 by the main band 5 for gripping the adapter is released, and the main band 5 is lowered. , The gripping portion 4a of the adapter to the main band 5
After the gripping, the gripping of the adapter 4 by the adapter gripping sub-band 9 is released and the main band 5 for gripping the adapter is raised, and such operation is performed at least once to move the vertical hole excavator in the lateral direction. The adapter 4 is raised to a position suitable for the operation.

After the completion of the fifth step, in a sixth step, the vertical hole excavator is moved in the horizontal direction as shown in FIG. 15 is a large-diameter joint casing 2 from above.
-2, and perform the unloading work. After the earth removal operation, as a seventh step, the joint casing 2-3 added to the joint casing 2-2 as shown in FIG. 4D is carried into the casing installation work space 21 by the crane 14. Thereafter, as shown in FIG. 4 (e), the vertical drilling device is moved back to the original position by adding it to the underground joint casing 2-2. By this seventh step, the subsequent joint casing 2
-3 is completed, so that the subsequent joint casing 2
The first step for pushing -3 is repeatedly performed. FIG. 4F shows the state after the completion of the first step.

As described above, the first to seventh steps are repeatedly performed according to the number of the unit casings 2 to be built in the ground, and the vertical hole is excavated. Only the first to sixth steps are performed, and the seventh step is not performed. In the example shown here,
Although all the unit casings 2 are formed to have the same length,
If there is a unit casing 2 having a different length, the third step and the fifth step are performed by the thrust cylinder 6.
Only the unit casing 2 longer than the stroke of the thrust cylinder 6 needs to be carried out. For the unit casing 2 shorter than the stroke of the thrust cylinder 6, the second step or the fourth step is carried out, and the same method as the conventional technique is used. You only need to drill a vertical hole.

The conventional drilling method according to the prior art, in which the large-diameter unit casing 2 is pushed through the adapter 4, uses a standard drilling rig without using a special drilling rig for large-diameter drilling. Although it has an excellent effect of being able to drill a vertical hole with a diameter, first of all, as described in "Problems to be Solved by the Invention", it takes time and effort to remove the earth and lowers the work efficiency. Secondly,
There is a problem that the unit casing 2 longer than the stroke length of the thrust cylinder 6 cannot be used. However, in this vertical hole drilling method, the earth removal work in the casing 2 is
By performing in the sixth step instead of at the end of the third step as in the prior art,
Can be directly inserted into the large-diameter casing 2 without passing through the small-diameter grip portion 4a of the adapter 4, and the earth discharging operation can be performed, so that the first problem can be solved.

That is, by using the upper opening portion 22 to directly insert the hammer rub 15 into the large-diameter casing 2 so that the earth discharging operation can be performed, a large-sized casing corresponding to the diameter of the large-diameter casing 2 can be obtained. Since it is possible to perform the earth removal operation using the hammer rub 15, the earth and sand in the casing 2 can be
It is possible to discharge very efficiently without leaving the surrounding area dug. In addition, even when the small-sized hammer club 15 is used to excavate the earth and sand inside the large-diameter casing 2 stepwise over the entire area, the degree of freedom of the operation of the hammer club 15 is restricted as in the related art. Therefore, the small-sized hammer grave 15 can be operated without any trouble and the step-by-step excavation work can be smoothly performed, and the earth removal work can be achieved more efficiently than the conventional technology.

As described above, in this vertical hole excavation method, the hammer grave 15 can be directly inserted into the large-diameter casing 2 to excavate and discharge the earth and sand therein. Even casing 2
The soil inside can be discharged more efficiently than the conventional technology. In this case, in particular, the step of moving the vertical hole drilling device in the horizontal direction, which is indispensable for the vertical hole drilling method using the adapter 4, is used not only for adding the casing 2 but also for discharging the earth and sand in the casing 2. Utilizing this method, the problem of earth removal work peculiar to the vertical hole drilling method using the adapter 4 is solved, and the method is extremely rational. Furthermore, in this vertical hole excavation method, the first to seventh steps are performed to excavate the vertical hole, so that the second problem is solved, and the large-diameter casing 2 is connected to the adapter. Even in the case of the vertical hole excavation method in which the thrust cylinder 6 is pushed through the casing 4, the casing 2 longer than the stroke length of the thrust cylinder 6 can be used, and increase in the construction period and the construction unit price can be suppressed.

In order to use the unit casing 2 longer than the stroke of the thrust cylinder 6 in the vertical hole excavation method in which the large-diameter casing 2 is pushed through the adapter 4, simply use the adapter 4 having a longer stroke. In addition to pushing down the unit casing 2 into the ground by lowering the distance, the lowered adapter 4 is re-raised to a position where it does not hinder the movement of the vertical hole excavator in the lateral direction, and the pushing operation of the unit casing 2 is performed. It needs to be repeatable. In the vertical hole excavation method according to the present embodiment, in order to enable the operation of pushing the unit casing 2 longer than the stroke of the thrust cylinder 6 to be repeated, a margin portion 4c is provided in the grip portion 4a of the adapter, and the adapter 4 is gripped. As a means, a vertical hole excavator provided with a sub-band 9 in addition to the main band 5 for gripping the adapter is used. In this respect, there is a device which cannot be seen in the conventional technology.

In the example described above, an example is shown in which the main band 5 for gripping the adapter is used as the gripping device for the adapter 4. However, this type of gripping device includes a ring-shaped rotating body and a casing inserted therethrough. In some cases, a wedge-shaped chuck member is fitted into a gap between the tubular member and the tubular member, and the tubular member is gripped by the wedge action. In other words, any adapter can be used as long as it can be gripped by inserting the gripping portion of the adapter.

[0043]

As is apparent from the above description, the vertical hole excavation method of the present invention employs the means described in the section "Means for Solving the Problems", so that a large-diameter casing can be reduced in diameter. Even with the vertical hole drilling method in which a vertical hole is drilled by a vertical hole drilling device that is gripped via an adapter, a drilling tool such as a hammer grab can be directly inserted into a large-diameter casing to perform earth removal work. Can be efficiently discharged. In particular, the earth removal process in the vertical hole drilling method of the present invention is not limited to the operation of moving the vertical hole drilling device in the horizontal direction indispensable for the vertical hole drilling method using the adapter, not only for the operation of adding the casing, but also for the earth and sand in the casing. It is also used for the work of discharging the soil, so as to solve the problem of the earth removal work peculiar to the vertical hole drilling method using the adapter, and the method is extremely rational. When the present invention is embodied, particularly when embodied in claim 2, in addition to exhibiting such effects, a casing longer than the length of the stroke of the elevation drive device is used. It is possible to suppress an increase in the construction period and the construction unit price.

When the present invention is embodied, in particular, if the present invention is embodied as described in claim 3, even if the adapter is removed from the shaft excavator and transported to the work site, At the time of vertical hole excavation work, the removed adapter can be easily attached to the vertical hole excavator without requiring a large-scale assembling operation. When the present invention is embodied, particularly when embodied as described in claim 4, the adapter does not require a complicated centering for connecting to the splicing casing, and the connection work between the two can be performed. It can be performed efficiently. When the present invention is embodied, and particularly when embodied as described in claim 5, even if a long unit casing is used to perform a well excavation operation, the well excavating apparatus can be relatively operated. Since it can be installed at a low position, the vertical hole excavation work can be performed stably and safely, and various operations associated with the excavation of the vertical hole can be performed at a low position, which is convenient for work. When the present invention is embodied, in particular, if embodied as described in claim 6, the earth and sand in the casing 2 is discharged very efficiently without reliably leaving the surrounding portion unexcavated. be able to.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a vertical hole drilling apparatus used for a vertical hole drilling method according to the present invention, and is a diagram showing a situation when an earth discharging process is performed.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of the vertical hole excavator of FIG. 1 and shows a state at the end of an adapter connecting step.

FIG. 4 is a diagram for explaining a construction procedure of a vertical hole excavation method according to an embodiment of the present invention.

[Explanation of symbols]

 2 Casing 3 Stand 4 Adapter 4a Adapter gripping part 4b Adapter coupling part 4c Adapter margin 5 Main band for adapter gripping 6 Thrust cylinder 7 Elevating frame 8 Hydraulic motor 9 Subband for adapter gripping 10 Base frame 11 Support frame Reference Signs List 12 horizontal moving device 13 horizontal adjusting device 14 crane for vertical hole excavation work 15 hammer grab 17 auxiliary holding device for holding casing 18 main holding device for holding casing 19 hydraulic cylinder for raising / lowering main holding device 21 working space for installing casing 22 Upper opening

Continuing on the front page (72) Inventor Hiroshi Kusumi 650, Kandate-cho, Tsuchiura-shi, Ibaraki Prefecture Inside the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. Inside the plant (72) Inventor Masanori Tahara 650, Kandate-cho, Tsuchiura-shi, Ibaraki Prefecture Inside the Tsuchiura Plant, Hitachi Construction Machinery Co., Ltd. F term (reference) 2D029 DC01 PA07 PC02 PD02

Claims (6)

[Claims] 1. An adapter having a grip portion and a lower end portion provided with a connecting portion capable of connecting a casing having a larger diameter than the grip portion, a gripping device capable of inserting and gripping the gripping portion of the adapter, and a gripping device. A vertical drilling device equipped with a rotary drive device that can be driven to rotate and a lifting drive device that is installed on the base frame and that can raise and lower the gripping device can be moved laterally by providing a work space for casing installation below. By installing, holding the adapter with the gripping device and connecting it to the casing, lowering the gripping device with the lifting drive while rotating the gripping device with the rotary driving device, pushing the casing into the ground and discharging the earth and sand in the casing In the vertical hole excavation method for excavating a vertical hole, the gripping part of the adapter is gripped by the gripping device, and the casing is installed in the casing installation work space. The step of connecting the adapter to connect the connecting part of the adapter, the step of pushing down the casing to lower the gripping device while rotating and pushing most of the casing into the ground, separating the adapter from the casing, and moving the vertical hole excavator horizontally Lifting process of the adapter to raise the adapter to an appropriate position to move in the direction, and a soil removal process of excavating and discharging the earth and sand in the casing by using a drilling tool such as a hammer club by moving the vertical hole drilling device laterally, A vertical hole excavation method, wherein a vertical hole is excavated by adding a joint casing to an underground casing and performing a casing connecting step of moving a vertical hole excavator to an original position. 2. The method according to claim 1, wherein:
As the adapter, an adapter having a portion in the grip portion that allows the grip device to move in the vertical direction when inserted into the grip device is used, and a casing longer than the stroke of the lifting drive device is used as the casing, and the casing is pushed in. In the case, the first step of lowering the casing while rotating the gripping device and pushing the casing into the ground,
After releasing the gripping of the adapter by the gripping device, the gripping device is raised, the gripping portion of the adapter is gripped by the gripping device, the gripping device is lowered while rotating, and the casing is pushed into the ground. And a second step of pushing the casing into the ground for a distance longer than the stroke of the lifting drive device by performing the first step or more, and performing the step of lifting the adapter, the first step of separating and lifting the adapter from the casing After holding the adapter with a gripping device different from the gripping device, releasing the gripping of the adapter with the gripping device and lowering the gripping device, and then gripping the gripping portion of the adapter with the gripping device, Release the gripping of the adapter with another gripping means, raise the gripping device, and
A second step of raising the adapter to an appropriate position for moving the vertical drilling device in the horizontal direction by performing the drilling process more than once. 3. An adapter formed into a shape that can be inserted into the gripping device from below, and when the adapter is inserted into the gripping device in a stage prior to the step of pushing the casing in, a vertical hole excavating device is used for mounting the casing. After moving laterally so as to open the work space, the adapter was carried into the work space for installing the casing using the upper opening generated by the movement and was fixed, and then the adapter was fixed. The vertical hole drilling method according to claim 1 or 2, wherein the vertical hole drilling device is moved to the place and the adapter is lifted to insert the adapter into the holding device from below. 4. A method according to claim 1, further comprising the step of: positioning said shaft excavator so that said shaft excavator can be fixedly positioned at a position where the excavation operation is to be performed. The method of excavating a vertical hole according to claim 3. 5. A work space for installing a casing is provided underground.
Vertical hole drilling method according to any one of the above. 6. The vertical hole drilling method according to claim 1, wherein the drilling tool is a large-sized hammer rub corresponding to the inner diameter of the casing.