JP3479643B2 - Boring rod - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring rod having a double pipe structure of an outer pipe and an inner pipe, which is used for drilling work on the ground or the like. The present invention relates to a boring rod in which a pouring hole for pouring a filling material is provided in the void, the pouring hole is closed at the time of drilling, and the pouring hole can be opened at the time of pouring the filling material.

[0002]

2. Description of the Related Art A conventional boring rod has a double pipe structure of an outer pipe and an inner pipe and is provided with a drill bit at the tip of the outer pipe and the inner pipe. The structure was such that a pouring hole for pouring the filler was provided in the void. Then, while ejecting the drilling fluid from the position of the drilling bit through the inside of the inner pipe, the rotary force and pressing force are applied to the inner pipe to drill the ground with the drilling bit, and after drilling, pull out the inner pipe from the outer pipe. The filling material is injected into the outer pipe, and the filling material is poured out from a plurality of pouring holes provided in the outer pipe into the space between the outer pipe and the drilled hole. However, when drilling with the boring rod having this configuration, there is a problem that the drilling liquid escapes from the pouring hole to the outside, the discharged hydraulic power is reduced, and the drilling slime is difficult to be discharged. In particular, those with vertical drilling holes and those with the drilling direction angled downward had very poor discharge efficiency. In addition,
A boring rod with no pouring hole is also used for the outer tube, but it is difficult to fully fill the entire space between the outer tube and the drilled hole because the filling material pours out only from the tip. .

[0003]

The problem to be solved by the present invention is to solve these problems of the prior art, and during drilling, the drilling slime can be smoothly discharged regardless of the drilling angle, and the filling material An object of the present invention is to provide a boring rod in which a pouring hole is opened at the time of pouring so that the space between the outer tube and the drilled hole can be uniformly filled over the entire area.

[0004]

[Means for Solving the Problems] The structure of the present invention which has solved the above problems is as follows: 1) A double pipe structure of an outer pipe and an inner pipe is provided with a drill bit at the tip of the outer pipe and the inner pipe, In the boring rod where the drilling fluid is ejected from the position of the drilling bit while applying the rotating force and the pressing force to the inner pipe to drill the ground with the drilling bit, multiple pouring holes are provided in the outer pipe. Attach a normally closed valve that opens with the injection pressure of the filler to the outlet, and
Has elasticity and is attached to the pouring hole in a crimped state.
The diameter of the central zone of the outer peripheral surface of the
It is attached so as to form a gap with the inner peripheral surface, the valve is closed during drilling to allow mud drainage, the valve opens at the injection pressure when filling the filler after drilling, and the filling material from the outer periphery of the outer pipe Boring rod characterized by being capable of pouring out 2) Attach the valve by inserting it into the pouring hole so that the valve is thinner than the thickness of the outer pipe and does not protrude from the inner and outer surfaces of the outer pipe. 1) The boring rod according to 1) above, which has a filling material injection pressure of 290 to 400 kP.
The above 1), which is installed so that the pouring hole opens at a.
~ 2) The boring rod according to any one of the above.

[0005]

According to the present invention, at the time of drilling, the pouring hole of the outer pipe is always closed by the valve, and the drilling slime is smoothly discharged without the drilling liquid escaping to the outside and the discharge hydraulic power being lowered. . After drilling, collect the inner pipe and press the filler into the outer pipe,
The pressure opens the valve. The filling material is poured out from the opened pouring hole over the entire area outside the outer tube, and the entire space between the outer tube and the drilled hole is uniformly filled. The valve is thinner than the wall thickness of the outer tube and is attached so that it does not protrude from the inner and outer surfaces of the outer tube, eliminating protrusions on the outer and inner surfaces of the outer tube.
It is possible to reduce the resistance when the outer pipe is buried in the ground and when the drilling fluid is discharged together with the drilling slime. Since reduced in diameter the central zone of the outer peripheral surface of the valve having a resilient mounting in crimped state so as to form a gap between the outer surface and the inner circumferential surface of the note Deana valves, dispense during valve closure Ru can absorb vibration during drilling improves the air tightness of the hole.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Valves include those that come off the outer tube, those that open and close with a hinge, and those that open and close by sliding in the lateral direction. They have elasticity such as rubber and are crimped so as to come off the outer tube. Those that can be mounted in a state are preferable because they are inexpensive and can be easily mounted. The thickness of the valve is made thinner than the thickness of the outer pipe so that it does not protrude from the inner and outer surfaces of the outer pipe in order to reduce the resistance when the outer pipe is buried in the ground and when the drilling fluid is discharged together with the drilling slime. Is preferred . The valve should not open at the pressure when the drilling fluid is discharged, but at the pressure when the filling material is injected. The pressure at the time of discharging the drilling fluid is usually 1 to ² kgf / cm ² (98 to
196 kPa), the pressure during injection of the filler is 3
-4 kgf / cm ² (294-392 kPa) is a practical one.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In the embodiment shown in FIGS. 1 to 4, a plurality of spout holes having a diameter of 10.0 mm are provided at intervals of about 50 cm in an outer tube having a thickness of 6.0 mm, and the spout holes have a thickness of 5.0 mm and a diameter of 10.5 m.
The valve made of rubber, whose center band on the outer peripheral surface is reduced to 9.0 mm in m, is attached in a crimped state so as not to project from the inner and outer surfaces of the outer tube, and the injection pressure of the filler into the outer tube is 300 kPa.
This is an example of a boring rod in which the valve is removed from the pouring hole to some extent. FIG. 1 is a partially cutaway front view of a boring rod of an embodiment. FIG. 2 is a front view of the outer tube of the embodiment. FIG. 3 is a sectional view of the outer tube and the valve of the embodiment. FIG. 4 is an explanatory view showing a state of boring rod drilling and filling material pouring according to the embodiment.

In the figure, 1 is a boring rod. Reference numeral 2 denotes an outer tube having a diameter of 30 cm, and a plurality of pouring holes 2a having a diameter of 10.0 mm are provided at intervals of about 50 cm, and a drill bit 2b is provided at the tip. Reference numeral 3 denotes an inner pipe which is a boring rod body, which is provided with a boring bit 3a at a tip thereof and is connected to a rotary pressing device (not shown) at a rear end thereof to give a rotational force and a pressing force to excavate the ground G with the boring bit 3a. I am able to do it. Reference numeral 4 denotes a valve, which is made of rubber and has a diameter of 10.5 mm and a central band of the outer peripheral surface reduced to a diameter of 9.0 mm, and does not protrude from the inner and outer surfaces of the outer tube 2 into the pouring hole 2a of the outer tube 2. Attached in the crimped state, and the outer peripheral surface of the valve 4 and the pouring hole 2a
A gap 4a is formed between the valve 4 and the inner peripheral surface of the valve 4 and the injection pressure of the filling material into the outer tube 2 is about 300 kPa.
I try to get out of it. G is the ground and M is a filler made of cement milk.

In the embodiment, the boring rod 1 is directed to the ground G to be drilled, and a rotary pressing device (not shown) applies a rotational force and a pressing force from the rear end of the inner pipe 3 to the drilling bits 2b and 3a at the tip. Drilling is performed. Figure 3 during drilling work
As shown in (a), the drilling liquid consisting of water is fed into the inner pipe 3 and ejected from a jet hole (not shown) at the position of the drill bit 3a, and carries the drilling slime between the outer pipe 2 and the inner pipe 3. It is discharged through the space at the rear hole mouth. At this time, the inner wall of the outer pipe 2 is about 9 times thick due to the drilling fluid and the drilling slime.
Although a pressure of about 8 to 196 kPa acts, the valve 4 that closes the pouring hole 2a cannot be removed by this pressure, so the drilling fluid escapes from the pouring hole 2a to the outside of the outer pipe 2 and the discharged hydraulic force. The drilling slime is discharged smoothly without any decrease in After drilling, the inner pipe 3 is pulled out from the outer pipe 2 and collected, but since the drilling slime is also sufficiently discharged at this time, the drill bit 3a at the tip is caught by the residual slime as in the conventional example and collected. Will not be difficult. Inner tube 3
After collecting, a pump (not shown) for supplying the filler M is attached to the hole mouth, and the filler M is press-fitted inside the outer tube 2 as shown in FIG. At this time, the injection pressure acts on the inner wall of the outer tube 2 by about 300 kPa, and the valve 4 is disengaged from the ejection hole 2a. The filling material M is poured out from the opened pouring hole 2a so as to spread over the entire outside of the outer tube 2, and the gap between the outer tube 2 and the drilled hole is uniformly filled. As described above, since the valve 4 having elasticity that is opened by the injection pressure of the filling material M is attached to the plurality of pouring holes 2a provided in the outer pipe 2 in a crimped state in advance, the pouring holes of the outer pipe 2 at the time of boring. It is possible to smoothly discharge the drilling slime without escaping the drilling fluid from 2a and reducing the discharge hydraulic power, and after drilling, the valve 4 is easily removed by the filling pressure of the filling material M to pour the filling material M, The space between the outer tube 2 and the drilled hole can be uniformly filled over the entire area. Further, since the valve 4 has a thickness smaller than that of the outer tube 2 and is attached so as not to project from the inner and outer surfaces of the outer tube 2, the outer tube 2 is grounded by removing unnecessary protrusions on the inner and outer surfaces of the outer tube 2. It is possible to reduce the resistance at the time of burying in the ground and discharging the drilling liquid together with the drilling slime. Further, since the central band of the outer peripheral surface of the valve 4 is reduced in diameter so as to form a gap 4a between the outer peripheral surface of the valve 4 and the inner peripheral surface of the pouring hole 2a, the pouring hole 2a is attached. The airtightness can be improved and the vibration at the time of drilling can be absorbed.

[0010]

As described above, according to the present invention, a valve that is opened by the injection pressure of the filling material is previously attached to a plurality of pouring holes provided in the outer pipe, so that the pouring of the outer pipe is performed at the time of drilling. Since the drilling fluid does not escape from the exit hole and the discharge hydraulic power does not decrease, the drilling slime can be smoothly discharged regardless of the drilling hole angle, and after drilling, the valve can be easily opened by the filling pressure of the filling material to fill it. The material can be poured out and the gap between the outer tube and the drilled hole can be uniformly filled over the entire area. In addition, the thickness of the valve is made thinner than the thickness of the outer pipe so that it does not protrude from the inner and outer surfaces of the outer pipe when the outer pipe is buried in the ground by removing unnecessary protrusions on the inner and outer surfaces of the outer pipe. Also, it is possible to reduce the resistance when the drilling fluid is discharged together with the drilling slime. Furthermore, since the attachment by crimping state to form a gap between the outer peripheral surface of the central band and reduced in diameter outer peripheral surface Note the inner peripheral surface of Deana valves of a valve having a resilient, Note Deana The airtightness can be improved and the vibration at the time of drilling can be absorbed.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a boring rod of an embodiment.

FIG. 2 is a front view of the outer tube of the embodiment.

FIG. 3 is a cross-sectional view of an outer tube and a valve according to an embodiment.

FIG. 4 is an explanatory view showing a state of boring rod drilling and filling material injection of the embodiment.

[Explanation of symbols]

1 Bowling rod 2 outer tube 2a pouring hole 2b Drill bit 3 inner tube 3a Drill bit 4 valves 4a void G ground M filler

Claims (3)

(57) [Claims] 1. A double pipe structure of an outer pipe and an inner pipe, in which a drilling bit is provided at the tip of the outer pipe and the inner pipe, and the drilling fluid is ejected from the position of the drilling bit through the inside of the inner pipe to rotate to the inner pipe. In a boring rod that drills the ground with a drilling bit by giving force and pressing force, a plurality of spout holes are provided in the outer pipe, and a normally closed valve that is opened by the injection pressure of the filler is attached to the spout hole. Only
Valve has elasticity and can be attached to the pouring hole in a crimped state.
In addition, the central zone of the outer peripheral surface of the valve is reduced to reduce the outer peripheral surface of the valve.
And the inner surface of the pouring hole so that a gap is formed between them
The boring rod is characterized in that the valve is closed during drilling and the mud can be drained, and when the filler is injected after drilling, the valve is opened by the injection pressure so that the filler can be poured from the outer circumference of the outer pipe. . 2. The boring according to claim 1, wherein the valve has a thickness smaller than that of the outer tube and is fitted and attached to the pouring hole so as not to project from the inner and outer surfaces of the outer tube. rod. 3. The injection pressure of the filling material is 290-4.
It is installed so that the pouring hole opens at 00 kPa.
The boring rod according to claim 1 .