JPH0235088B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a drilling and injection device for drilling holes in the ground and injecting and penetrating grout to a desired depth range to improve the ground, stop water, etc. .

(Prior art) Conventionally, when installing a grouting rod in the ground (including bedrock) prior to grouting, the rod is held upright against the ground and is rotated while being gradually propelled to insert a hard tip attached to the tip. , a method in which soil and stones are scraped with diamond chips, etc., and at the same time drilling water is forced into the rod and ejected from the tip (lower end), and the drilling water blows up the shavings (slime) to the ground while drilling. is taken.

In this case, if the ground to be drilled is rock, or is made up of a hard viscous layer, or where concrete has been poured, the lower edge of the rod where a hard chip, diamond chip, etc. is attached should be This occurs when only the facing ground is cut in a ring shape, and a cylindrical uncut part in the center protrudes into the rod, which may impede the supply of drilling water or cause the water supply pressure to become abnormally high. Or, in the worst case scenario, the rod may become clogged, making it impossible to dig, and to recover from this situation, it is necessary to lift the rod to the ground and remove the clogged material, which is inefficient and uneconomical. There was a problem.

Therefore, conventionally, in order to prevent the rod from clogging, a cutting blade in the shape of a single character, cross, etc. extending in the lateral direction of the rod was fixed to the inside of the tip of the rod, and cutting was also performed inside the lower edge of the rod. It is proposed to do so.

By the way, recently, in order to continuously and effectively perform drilling and injection into the target ground, an expansible packer and a tip device with a liquid discharge port were protruded from the lower end of the rod (outer tube) and withdrawn. The tip device is housed in the rod during drilling, and when the hole is finished, the tip device is protruded before grout is injected, and the packer is expanded to open a grout escape path between the hole wall and the rod. A drilling and injection device has been developed that blocks and then injects.
It is impossible to firmly provide this device with the above-mentioned linear or cross-shaped horizontal excavation blades. This is because, as can be easily understood, the drilling blade becomes an obstacle to the protrusion and withdrawal of the tip device (problem to be solved by the invention). To prevent clogging or clogging from occurring during drilling work in a pouring device.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a drilling and injection device having the above-mentioned tip device, which has a drilling blade in a direction transverse to the outer pipe, and has a drilling blade extending from the outer pipe. A horizontal blade member is provided that can be protruded and retracted, and is fixed in position so that the excavation blade is at approximately the same position as the lower edge of the outer tube when withdrawn, and this horizontal blade member is connected to the tip device. be.

(Function) With the above configuration, the horizontal blade member is withdrawn during drilling, and in this state, the drilling blade is maintained at approximately the same position as the drilling tip provided on the lower edge of the outer tube, and the drilling tip is Since the earth and stones on the entire lower end of the outer pipe are scraped together with the outer pipe, there is no columnar uncut residue, and when grouting, the horizontal blade member is made to protrude from the outer pipe together with the tip device.
It does not interfere with the operation of the advanced device in any way.

(Example) Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 and FIG. 2 are both front views of the device of the present invention, showing a part (outer tube) in longitudinal section.
Fig. 1 shows the state during drilling, and Fig. 2 shows the state during grout injection. In the figure, 1 is an outer tube, 2 is an inner tube, 3 is a tip device, and 4 is a side blade member.

The outer tube 1 functions as an excavation tube, and therefore, an excavation tip (see FIGS. 3 to 5) made of a hard tip, diamond, etc. is fixed to its lower end surface.
An inner tube 2 is fitted into the outer tube 1 at intervals, and this inner tube feeds drilling water and grout to the tip device 3. The inner tube 2 may be constructed as a multi-tube structure, thereby making it possible to separately feed different types of chemical solutions and mix them at the tip to form a flash-setting grout and inject it.

A tip device 3 is connected to the lower end of the inner tube 2 via a seal portion 6. The tip device has a tubular body 7 into which is fitted a packer 8 consisting of an expandable and deflated rubber sleeve. When the tip device 3 is protruded (Fig. 2), the packer is expanded by being supplied with pressure fluid (for example, pressurized air) supplied to the gap 9 between the inner and outer tubes, and comes into contact with the drilling wall, and the tip of the packer is expanded. The escape path of the grout to be discharged from the tip of the device 3 and penetrated into the ground is closed.

In the above-described hole injection device, according to the present invention, a side blade member 4 is provided at the lower end of the tip device 3 via a connecting member 10. This horizontal blade member has a digging blade 11 extending in a direction across the outer tube 1 at the tip,
This digging blade is held by a plate-shaped leg 12 extending rearward. As is clear from FIG.
The side portions of 2 are adapted to engage with vertical slits 13 provided at the lower end of the outer tube 1. Side blade member 4
Dimensions are determined so that in the retracted position of the saw, the digging blade 11 is located on the lower end surface of the outer tube 1, that is, on the side of the surface on which the digging tip 5 is provided. In this case, the excavating blade 11 does not need to be at the same level as the excavating tip 5, and may be shifted forward or backward relative to the tip 5.

As shown in FIGS. 3 to 5, the excavating blade 11 may be formed into a single character shape, a cross shape, or a Y shape, and is preferably made of a cemented carbide chip.
Further, it is preferable that the slit 13 and the side portions of the legs 12 that engage with the slit 13 have a shape that widens toward the tip as shown in the figure, so that mutual engagement and disengagement can be made smoothly and reliably. It is done.

It is preferable that the lower end portion of the outer tube 1, that is, the portion where the excavating tip 5 and the slit 13 are provided, be configured as a crown 14, which is screwed onto the outer tube body and made removable.

(Effects of the Invention) Since the device according to the present invention has the above-described structure and operation, no columnar uncut portions are left when drilling holes in clay ground, concrete-filled ground, or rock. Therefore, the hole drilling work can be carried out continuously and quickly, and economical ground improvement can be carried out in a short period of time.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of the drilling injection device according to the present invention in a state during drilling, FIG. 2 is a partially sectional front view of the same drilling injection device in a state during grout injection, and FIG. FIG. 4 is a perspective view of the lower end of the same drilling injection device, FIG. 4 is a perspective view of the lower end in another embodiment, and FIG. 5 is a perspective view of the lower end in yet another embodiment. Explanation of symbols: 1... Outer tube, 2... Inner tube, 3...
Tip device, 4...Horizontal blade member, 5...Drilling tip, 8...Packer, 11...Drilling blade, 13...
Vertical slit.

Claims (1)

[Scope of Claims] 1. An outer tube for drilling a hole with a tip for drilling attached to the lower edge thereof, and an inner tube for feeding liquid fitted inside the outer tube,
In the drilling and injection device, a tip device having a liquid discharge port and a packer is protruded from and retractably connected to the outer tube at the tip of the inner tube, and has a drilling blade in a direction transverse to the outer tube; It has a horizontal blade member that protrudes from the outer tube and is removably provided, and is fixed in position so that the digging blade is at approximately the same position as the lower edge of the outer tube when withdrawn, and this horizontal blade member is attached to the tip device. A drilling injection device characterized by being connected to. 2. The drilling and injection device according to claim 1, wherein the drilling blade extends in a straight line in the diameter direction of the outer tube. 3. The drilling and injection device according to claim 1, wherein the drilling blades intersect at the center of the outer tube and extend in a criss-cross shape. 4. Claim 1, wherein the digging blade is provided at the tip of a leg extending in the vertical direction, and the leg is supported and guided by engaging with a vertical slit provided in the outer tube.
The drilling injection device according to any one of items 1 to 3.