JPH0745617Y2 - Tip structure of water collecting hole - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip structure of a water collecting hole pipe to be buried in the ground for collecting groundwater for the purpose of landslide countermeasure.

[0002]

2. Description of the Related Art As shown in FIG. 5 (B), as a countermeasure against landslides in the ground 1, a hole-holding pipe 2 for collecting groundwater is buried at an appropriate upward slope.

FIGS. 3 and 4 show a boring process for burying the hole-holding pipe 2 in the natural ground 1.
As shown in (A), the casing 4 from the retaining wall 3 to the natural ground 1
Is drilled for a predetermined length, the hole hammer 6 attached to the tip of the rod 5 is inserted into the casing 4, and the hole hammer 6 excavates the tip end of the casing 4 while simultaneously adding and pushing the casing 4. Repeatingly, the casing 4 is sequentially inserted.

As the insertion length of the casing 4 with respect to the natural ground 1 increases, the resistance required for pushing increases, so that the large diameter casing 7 is inserted outside the casing 4 as shown in FIG. The pushing resistance is reduced and the excavation and the insertion of the casing 4 are repeated. At this time, when the drilled portion is a crush zone and the collapse in the hole is large, the large diameter casing 7 is drilled into the crush zone to prevent the collapse.

As described above, the excavation by the hole hammer 6 and the pushing of the casing 4 and the large diameter casing 7 are alternately used together, and generally, the casing 4 is inserted up to about two-thirds of the total design length. Then, the remaining one-third is used as a hole drilled by the hole hammer 6.

After that, as shown in FIG. 3C, the porous hole retaining tube 2 is inserted over the casing 4 and the drilled hole 8, the casing 4 and the large diameter casing 7 are removed, and the hole retaining tube 2 is grounded. The work is completed by leaving it in 1.

By the way, the hole-preserving pipe 2 is simply inserted from the casing 4 into the drilled hole 8 and is shown as horizontal in the drawing, but in reality it has an upward slope. , The casing 4 as shown in FIG.
Is connected to the boring machine 9 and is withdrawn while rotating, the hole-retaining tube 2 is also withdrawn.

The casing 4 has a thickness of 1.5 as shown in FIG.
The length of m is a predetermined length by sequentially connecting with the joint screw 10, and therefore the joint screw 10 has to be removed at the time of removal by pulling.

However, when the hole-preserving tube 2 is pulled out together with the casing 4, as shown in FIG. 4B, the hole-holding tube 2 serves as an axis inside the casing 4 to be removed, and the casing 4 is removed. Can not do.

Therefore, it is necessary to repeatedly remove the boring machine 9 from the casing 4, reinsert the hole-holding tube 2, connect the boring machine 9, and remove the joint screw 10, which requires a great deal of labor and time. It will cost.

When a collapse 8a occurs as shown in FIG. 4 (A) in the drilled hole 8 from which the hole-holding tube 2 is removed together with the casing 4,
It becomes difficult to reinsert the holding tube 2.

In order to prevent the above-mentioned various problems from occurring, it is necessary to fix the hole-retaining tube 2 to the ground 1 after the insertion is completed and prevent it from being pulled out together with the casing 4.

FIG. 5 (A) illustrates a conventional tip structure for preventing the hole-preserving tube 2 from being pulled out. The conical cap 11 is fixed to the tip of the hole-preserving tube 2 and the hole-preserving tube 2 is shown. A check arm 12 that constantly expands outward is provided on the outer periphery of the tip end of the hole, and when the hole-retaining pipe 2 enters the drilled hole 8, the check arm 12 is cut into the drilled hole 8. It engages with the peripheral wall in the retaining direction.

[0014]

By the way, in the above-mentioned tip structure, the check arm 12 acts at the same time when it is inserted into the drilled hole 8 and cannot be pulled out. If a large collapse 8a occurs on the way and insertion by human power becomes impossible, it will not be possible to pull out or insert it, and it will not be possible to remove the collapse 8a with a hole hammer. A situation occurs where it cannot be buried.

In view of the above, this invention allows the retaining tube to be smoothly inserted into a small collapse, and can be easily pulled out when it cannot be inserted due to a large collapse. It is an object of the present invention to provide a tip structure of a hole collecting pipe for collecting water, which can be prevented from coming off.

[0016]

In order to solve the above-mentioned problems, the present invention has a pilot cap attached to the tip of a hole-holding pipe, and the peripheral wall of the hole-holding pipe on the tip side is more axial than the pilot cap. A plurality of anchor members are attached to a position closer to the inner side of the pilot cap, and the pilot cap has a shaft portion that fits inside the hole-holding pipe, and is larger than the inner diameter of the hole-holding pipe at the tip side of the shaft portion. Diameter, and when a predetermined pressing force acts in the axial direction while receiving the tip surface of the hole-holding pipe, the outer circumference breaks and the breakable part enters the hole-holding pipe, and the head provided at the tip of this breakable part The anchor member is formed by providing a bent portion that penetrates a window hole of the hole retaining tube and projects into the hole retaining tube at a tip of an arm portion along the outer peripheral axis of the hole retaining tube. The anchor member is destroyed by the destructible part of the pilot cap. Bent portion is entered the shank in which is pressed and the arm portion so that along the inner surface of the holding hole pipe adopts the configuration adapted to expanding movement outward.

[0017]

[Function] Since the arm member of the anchor member attached to the outer periphery of the tip of the hole-holding pipe overlaps the peripheral wall of the hole-holding pipe, the retaining action does not occur even if the hole-holding pipe is inserted into the drilled hole in the ground. If the hole has a large fall and cannot be inserted, the hole-holding pipe can be removed without any trouble, and the work of removing the fall can be performed.

Further, when the pilot cap comes into contact with rock or the like with the entire length of the hole-holding pipe inserted, a pushing pressure is applied to the hole-holding pipe.

When pushing pressure is applied to the hole-holding tube, pressure is applied to the end surface of the destructible portion of the pilot cap with which the tip surface of the hole-holding tube is in contact, and the outer peripheral surface of the destructible portion is broken, and the pilot cap is damaged. On the other hand, the retention tube advances.

Since the shaft portion of the cap enters into the hole-holding tube by the forward movement of the hole-holding tube with respect to the pilot cap, and the bent portion of the anchor member is pressed by this shaft portion to follow the inner peripheral surface of the hole-holding tube. , The arm part expands outward with the window hole as a fulcrum, and the tip of the arm bites around the drilled hole, so that the hole-holding pipe is in a retaining state.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.

As shown in FIGS. 1A to 1C, the hole holding tube 2
The pilot cap 21 attached to the tip of the shaft is made of wood or resin, and has a circular shaft portion 22 that fits in the hole retaining tube 2, a destructible portion 23 provided at the tip of the shaft portion 22, and a destructible portion 2.
3 and a head 24 provided at the tip.

The destructible portion 23 is a circular shaft having a diameter larger than the inner diameter of the hole keeping tube 2, and its rear end face is the tip contact surface 25 of the hole keeping tube 2.
Thus, peripheral grooves 26 and 27 are provided at the middle of the outer peripheral surface and at the tip end portion which is the boundary with the head 24, and the groove bottoms of the peripheral grooves 26 and 27 are equal to or slightly smaller than the inner diameter of the hole retaining tube 2. It has become.

The head 24 has a conical shape with a spherical tip and a rear end having an outer diameter similar to that of the destructible portion 23.

The pilot cap 21 is shown in FIG.
As shown in (A), the shaft portion 22 is inserted into the hole retaining tube 2, and the tip of the hole retaining tube 2 is set in contact with the contact surface 25 formed on the rear end surface of the destructible portion 23. By screwing a screw 29, which penetrates an elongated hole 28 provided in the axial direction on the peripheral wall of the hole-preserving tube 2, into the shaft portion 22, the pilot cap 21 is fixed to the hole-preserving tube 2.
It is attached to the tip of the so that it does not come off.

On the peripheral wall of the hole-preserving tube 2, a plurality of window holes 31 are arranged in the circumferential direction at positions slightly rearward of the rear end of the shaft portion 22 of the pilot cap 21 set in the hole-preserving tube 2. The anchor members 32 are provided at intervals and the anchor members 32 are attached to the respective window holes 31.

As the anchor member 32, a band-shaped metal plate is used, and the arm member 3 is arranged along the axial direction of the outer peripheral surface of the hole-holding tube 2.
3 is formed by bending a bent portion 34 that penetrates the window hole 31 of the hole retaining tube 2 and projects into the hole retaining tube 2, and each anchor member 32 has an arm member 33 on the outer periphery of the hole retaining tube 2. It is held by a band 35 of rolled rubber or the like, overlaps with the outer peripheral surface of the hole-holding tube 2, and each bent portion 34 protrudes in a state of slightly tilting rearward toward the inner axis of the hole-holding tube 2. .

As shown in FIG. 1 (A), the hole-holding tube 2 has a pilot cap 21 attached to its tip and a plurality of anchor members 32 attached to its peripheral wall.
As shown in FIGS. 3 (A) and 3 (B), after boring work is performed, it is inserted into the drilled hole from the casing of the natural ground.

When inserting the hole-preserving tube 2 into the hole,
When the collapse generated in the drilled hole is small, the conical shape of the head portion 24 allows the small collapse force to pass through the collapsed portion.

On the other hand, if the collapse is large, the hole-holding tube 2 cannot be inserted manually. At this time, as shown in FIG. 1 (A), the arm portion 33 of each anchor member 32 has the hole-holding tube 2. Since the retaining hole is held along the outer surface of the retaining hole, the retaining hole 2 is not pulled out, so that the retaining tube 2 can be freely removed and a large collapse can be removed after the retaining tube 2 is removed.

The head 21 of the pilot cap 21 comes into contact with the inner end of the drilled hole 8 with the entire length of the drilled hole 2 being inserted into the drilled hole 8. In this state, the hole holding pipe 2 is hammered or hammered. When the hole-holding tube 2 is advanced by the mechanical pushing, the hole-holding tube 2 tries to move forward with respect to the pilot cap 21 that stops, and the tip of the hole-holding tube 2 applies axial pressure to the contact surface 25 of the destructible portion 21.

Since the frangible portion 23 is provided with the circumferential grooves 26 and 27 on the outer peripheral surface, the outer peripheral surface layer is weak in strength against the pressing force in the axial direction, and therefore, the tip of the hole-holding tube 2 is abutted. Interface 2
When 5 is subjected to an impact in the axial direction, as shown in FIG. 2, the surface layer 23a of the destructible portion 23 is broken so as to be shaved in the axial direction, and the destructible portion 23 is press-fitted with the inner diameter of the hole retaining tube 2. It changes axially.

When the surface layer 23a of the destructible portion 23 is broken, the tip of the hole retaining tube 2 comes into contact with the rear end surface of the head 24, and the hole retaining tube 2
Moves forward by the length of the destructible part 23, whereby the shaft part 22 enters the bent parts 34 of the anchor member 32.

As shown in FIG. 2, the shaft portion 22 has a bent portion 3
4 is pressed against the inner surface of the hole-retaining tube 2, whereby the anchor member 32 causes the arm portion 33 to expand outward with the hole 31 as a fulcrum, the band 35 is broken, and the tip is scraped as shown by the one-dot chain line in FIG. When the hole retaining pipe 2 is bitten into the inner periphery of the hole 8 and a pulling force is applied to the hole retaining pipe 2, the hole retaining pipe 2 is further bited as shown in the solid line in FIG.

Therefore, the entire length of the hole-preserving tube 2 can be inserted into the drilled hole 8 so as to prevent the hole-preventing tube 2 from being pulled out, and the casing can be removed without any trouble after the hole-preserving tube 2 is inserted.

The destructible portion 23 of the pilot cap 21 may be formed by freely setting the thickness of the surface layer portion, the axial length, the number of circumferential grooves, etc. according to the geology of the natural ground 1. By embedding the hole-holding pipe 2 in the mountain 1, the groundwater that permeates the natural ground 1 flows into the hole-holding pipe 2 from the surrounding small holes, and passes through the hole-holding pipe 2 to the outside of the earth-ground 1 Will be discharged to.

[0037]

[Effect] As described above, according to this invention, when inserting the hole-holding pipe into the hole drilled in the ground, the hole-holding pipe can be removed if the hole-falling pipe has a large collapse and cannot be inserted. It becomes possible to insert the whole length of the hole-holding pipe into the drilled hole by removing the.

When the hole-holding pipe is further pressed into the hole-making hole while the full-length hole is being inserted into the hole-drilling hole, the arm portion of the anchor member expands and digs into the inner periphery of the hole-drilling hole. Only the hole retaining pipe can be prevented from being pulled out, the casing can be smoothly removed in the boring work, and the labor of burying the hole retaining pipe for collecting water can be saved and the efficiency can be improved.

[Brief description of drawings]

FIG. 1A is a cross-sectional view showing a tip structure of a water collecting hole pipe, FIG. 1B is a cross-sectional view taken along the arrow BB of FIG. 1A, and FIG.
Is a cross-sectional view taken along the arrow C-C of (A)

FIG. 2 is a cross-sectional view showing a retaining hole retaining state.

3A to 3C are cross-sectional views sequentially showing a boring work process.

FIG. 4 (A) is a cross-sectional view showing a collapsed state when a hole-holding tube is inserted, and FIG. 4 (B) is an explanatory view showing that the casing cannot be removed due to the hole-holding tube being pulled out.

FIG. 5 (A) is an explanatory view showing a conventional hole-retaining tube tip structure,
(B) is an explanatory view showing the installation of the hole holding tube

[Explanation of symbols]

 2 Hole retaining pipe 21 Pilot cap 22 Shaft portion 23 Destructible portion 24 Head 25 Tip contact surface 26, 27 Circumferential groove 31 Window hole 32 Anchor member 33 Arm portion 34 Bending portion 35 Band

Claims (1)

[Scope of utility model registration request] 1. A pilot cap is attached to the tip of a hole-holding pipe, and a plurality of anchor members are attached to a peripheral wall on the tip end side of the hole-holding pipe inward of the pilot cap in the axial direction. The cap has a shaft portion that fits inside the hole-holding pipe, a diameter larger than the inner diameter of the hole-holding pipe located on the tip end side of the shaft portion, and a predetermined axial length in a state of receiving the tip surface of the hole-holding pipe. When the pressing force acts, the outer periphery is broken and enters the hole-holding pipe, and is formed by a destructible part and a head provided at the tip of the destructible part. It is formed by providing a bent part that penetrates the window hole of the hole-holding pipe and projects into the hole-holding pipe at the tip of the arm part along which the anchor part breaks into the shatterable part of the pilot cap and enters the shaft part. When the bent part is pushed along the inner surface of the hole holding tube with The tip structure of the water collecting hole pipe with the dome part expanding outward.