JPH055993B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a drilling device and a drilling method.

(Prior art) Conventionally, in excavation work for pile driving, a drilling pipe is advanced as the bit equipment advances in excavation.
When the excavation depth reaches a predetermined depth, the excavation pipe is left in the excavation hole. The excavation equipment used for this kind of work is JP-A-63-219792.
There is a technique disclosed in the publication. This drilling equipment has a shaft erected on the top surface of a shaft hole drilled in the bottom surface of the device that receives the impact force of the hammer and the rotational force of the hammer cylinder, and is installed by inserting the shaft into the shaft hole. In the excavation equipment that has a bit device that rotates and excavates earth and sand, etc.
A groove is provided on the outer periphery of the shaft, and a through hole is provided on the side surface of the device to communicate with the shaft hole at a position corresponding to the groove when the shaft is inserted into the shaft hole,
The bit device is attached to the device by inserting a retaining pin into the concave groove at the tip thereof through the through hole.More specifically, the device and the bit device are integrated into one body. The bit device is mounted eccentrically on the bottom surface of the device, and when it rotates, the drilling radius is made larger than that of the drilling pipe and the drilling progresses, making the drilling pipe move forward together. When the excavation depth reaches a predetermined depth, the diameter of the bit device is reduced, and the bit device, device, and device striking mechanism such as an air hammer are removed from the excavation pipe. This allows the excavation pipe to remain in the excavated borehole.

(Problems to be Solved by the Invention) However, the above conventional excavation method has the following problems.

If only the excavation pipe is left in the excavation hole, the excavation pipe will gradually sink into the soil due to its own weight.
For example, even if the excavation pipe is filled with concrete,
The mutual adhesion between concrete and steel (excavation pipe) is weak, and only the excavation pipe sinks into the soil, making it ineffective as a pile.

The present invention has been made in view of this point,
An object of the present invention is to provide a drilling device capable of preventing sinking of a drilling pipe left in a drilling hole, and a drilling method using this bit device.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes the following configuration.

That is, the excavation equipment includes a device that is removably inserted into the excavation pipe, a drive means that is removably inserted into the excavation pipe and rotates the device forward, and a drive means that is removably inserted into the excavation pipe, and a drive means that rotates the device forward. is rotatably slidable to the lower end of the device, and is connected to the lower end of the device, and is provided with an air hole opening at the lower surface through which air that is compressed when the driving means hits the device; In the excavation apparatus, the bit apparatus includes a bit device that excavates earth and sand by receiving a rotational forward force from a device, and the bit device has an upper end formed in a first flange portion having a smaller diameter than the inner diameter of the excavation pipe, and a lower end of the bit device. A portion is formed at a second flange portion having a larger diameter than the outer diameter of the excavation pipe, and a portion between the first flange portion and the second flange portion is formed at an intermediate portion having a smaller diameter than the first flange portion. An engaging portion is formed at the upper end portion to be able to engage with the device and to be released from the engagement when the device is removed from the drilling pipe, and an engaging portion is formed in the middle portion of the bit device. has an inner diameter smaller than the first flange portion and is formed to be able to slide into the excavation pipe, and a second flange portion of the bit device that has an inner diameter larger than the outer diameter of the excavation pipe at its lower end. A collar having a large diameter portion at the lower end of a smaller diameter is fitted onto the outside so as to be rotatable in the circumferential direction, and the lower end portion of the excavation pipe is connected to the large diameter portion at the lower end of the collar which is slidably fitted inside the excavation pipe. The excavation method is characterized in that the above-mentioned excavation device is installed, the device is rotated forward through a drive means, the bit device excavates, and when the excavation depth reaches a predetermined depth, the excavation pipe is removed. The device is characterized in that the engagement between the device and the bit device is released, and the device and the driving means are removed from the excavation pipe.

(effect) The effect will be explained.

Since the bit device is detachable from the device, the device and drive means are removed from the excavation pipe when the excavation depth reaches a predetermined depth. The fixed bit device will remain in the wellbore. Therefore, the bit device left at the bottom of the excavation hole supports the weight of the excavation pipe, and it is possible to prevent the excavation pipe from sinking into the soil.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the configuration of the bit device will be explained.

FIG. 2 shows a perspective view of the bit device 10.

A first flange portion 12 and a second flange portion 14 are provided at the upper and lower ends of the bit device 10, respectively.
is formed. The flange portion 14 is formed to have a larger diameter than the flange portion 12. An engagement groove 16 serving as an engagement portion is carved on the upper surface of the flange portion 12 . The width of the engagement groove 16 is such that it can engage with a protrusion provided on the lower surface of the device, which will be described later. Two slime grooves 20 and 22 are cut from the flange portion 12 to the body portion 18. slime groove 20,
A slime passage 24 is opened in the inside of the slime passage 22, and the other end thereof is opened at the bottom surface of the bit device 10.

Reference numerals 26a and 26b are collar constituent members, and both collar constituent members 26a and 26b have a shape in which a cylindrical body is divided into two in the axial direction, and both flange portions 12,
14, and is combined to form a cylindrical outer periphery of a body 18 having a circumferential groove 17 formed on its outer circumferential surface, and is rotatable in the circumferential direction relative to the body 18 by welding the butted end surfaces. A freely movable collar is formed. The lower ends of the collar components 26a, 26b are formed into large diameter portions 28a, 28b.

A large number of bits 30 made of cemented carbide are embedded in the lower surface of the flange portion 14.

The upper end of the bit device 10 has an air hole 32, the other end of which opens at the bottom surface of the bit device 10, through which air compressed by an air hammer or the like passes.

FIG. 1 shows the excavation state, in which the collar 2 is rotatably provided on the body 18 of the bit device 10.
The lower end portion of the excavation pipe 34 is welded and fixed to the lower end large diameter portion 28 of 6. A device 36 is connected to the top of the bit device 10. device 36
A protrusion 38 protruding from the lower end surface engages with the engagement groove 16. Therefore, when the device 36 rotates and moves forward by hitting the top of the device 36 with a known hitting mechanism 40 such as an air hammer, which is a driving means, the bit device 1 engaged with the device 36 is rotated and moved forward.
0 also rotates together with the device 36 and moves forward while excavating earth and sand. At this time, since the collar 26 is free with respect to the bit device 10, the excavation pipe 34 fixed to the collar 26 does not rotate and moves only forward in unison with the advancement of the bit device 10. On this occasion,
As shown in FIG. 1, the diameter of the flange portion 14 of the bit device 10 is set to
Alternatively, since the diameter is larger than the diameter of the excavation pipe 34, the advancement of the excavation pipe 34 is facilitated. Further, since the outer periphery of the flange portion 14 is formed in a circumferential shape, resistance during excavation of earth and sand is small, and excavation efficiency is improved.

Note that when the hitting mechanism 40 hits the device 36, it compresses the air inside the excavation pipe 34, but the air hole 32 of the bit device 10 is formed on the upper end surface of the device 36.
There is an air hole (not shown) connected to the bit device 10, so that the compressed air can be exhausted and released from the lower end surface of the bit device 10. Further, a part of the excavated earth and sand passes through the slime grooves 22, 24 from the slime passage 24 of the bit device 10, and passes through the slime grooves 22, 24 of the bit device 10 at the flange portion 42 at the lower end of the device 36.
The slime is discharged through a notch (not shown) provided in a portion corresponding to 4 for slime passage.

When excavation is performed as described above and the excavation depth reaches a predetermined depth, the driving of the striking mechanism 40 is stopped, and the striking mechanism 40 and the device 36 are extracted from the inside of the excavation pipe 34. Since the device 36 and the bit device 10 are connected only by the uneven engagement between the protrusion 38 and the engagement groove 16, the device 36 and the bit device 10 can be easily separated. When the device 36 and the like are removed from the excavation pipe 34, only the bit device 10 and the excavation pipe 34 remain in the excavation hole 44. In this state, the weight of the excavation pipe 34 is
4, it is possible to prevent the excavation pipe 34 from sinking. If it is necessary to dig the excavation hole 44 even deeper, the device 36 and the striking mechanism 40 can be inserted into the excavation pipe 34 again and the excavation can be carried out again. Further, even when the excavation pipe 34 is filled with concrete, since the excavation pipe 34 is prevented from sinking, the effect of the concrete can be fully exhibited. If bit device 1
Air hole 32 and slime groove 2 opened in 0
If it is desired to close the openings 2 and 24, a plate or gasket may be inserted into the excavation pipe 34 to close the openings.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. be.

(Effect of the invention) When the drilling equipment and drilling method according to the invention are used,
Once the drilling pipe has been excavated to a predetermined drilling depth, the bit device can be left at the bottom of the drilling hole while being fixed to the lower end of the drilling pipe. Therefore, since the bit device supports the weight of the excavation pipe in the excavation hole, it is possible to prevent the excavation pipe from sinking into the soil over time, and it is possible to maintain the effectiveness of the excavation pipe as a pile. etc. to Qin.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an excavation method using an excavation device according to the present invention, and FIG. 2 is a perspective view showing the bit device. 10...Bit device, 12...First flange portion, 14...Second flange portion, 16...Engagement groove, 18...Body portion, 26...Collar, 28...Lower end large diameter portion, 32...Air hole, 34...Drilling pipe, 36...Device, 38...Protrusion, 40...
striking mechanism.

Claims (1)

[Scope of Claims] 1. A device that is removably inserted into an excavation pipe; A driving means that is removably inserted into and removed from the excavation pipe and rotates and advances the device while hitting the device; rotatably slidable to the lower end of the excavation pipe and connected to the lower end of the device;
An excavation device comprising a bit device that excavates earth and sand by receiving a rotational forward force from the device, and an air hole through which air compressed when the device is struck by the driving means is opened at the bottom surface. In the bit device, an upper end portion is formed in a first flange portion having a smaller diameter than the inner diameter of the drilling pipe, and a lower end portion is formed in a second flange portion having a larger diameter than the outer diameter of the drilling pipe. , an intermediate part between the first flange part and the second flange part is formed with a diameter smaller than that of the first flange part, and the upper end part is engageable with the device, and the device is connected to the excavation pipe. An engaging portion is formed in which the engagement is released when the bit device is pulled out from the bit device, and an engaging portion is formed in an intermediate portion of the bit device, the inner diameter of which is equal to the first
The second flange portion of the bit device has a large diameter portion smaller in diameter than the second flange portion of the bit device, and is formed to be able to slide into the excavation pipe. A collar formed with a collar is fitted onto the outside so as to be rotatable in the circumferential direction, and a lower end portion of the excavation pipe is fixed to an upper surface of a lower end large diameter portion of the collar that is slidably fitted inside the excavation pipe. Drilling equipment featuring: 2. The drilling equipment according to claim 1 is provided, and the device is rotatably advanced through a driving means to excavate with the bit device, and when the excavation depth reaches a predetermined depth, the device and the bit device are removed in an excavation pipe. An excavation method, comprising: releasing the engagement with the device, and removing the device and the drive means from the excavation pipe.