JPS5836688B2 - Drain installation method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drain pouring method and a drain pouring device in the drain method, which consolidates and improves soft ground by inserting a drain material into the soft ground and removing underground moisture. It is something.

Drain materials include cardboard and road-shaped drain materials, but although these drain materials are widely used for vertical drains, they are difficult to install for horizontal drains. In the past, it was rarely used except for laying.

The conventional vertical drainage method can be roughly divided into the following two types.
There are different types.

(b) Place the drain material while protecting it with a mandrel,
A method of pulling out the mandrel while leaving only the drain material in the ground.

(b) A method of attaching a jig for hooking the drain material to the tip of the rond and penetrating the rond.

This method results in bare pouring, where the soil and drain material come into contact with each other.

The method (a) is divided into the following types depending on the method of leaving the drain material.

(E1) One that uses a disposable anchor.

(E2) A device that blows air to reduce the frictional resistance between the mandrel wall and the drain material.

The latter (mouth) method can be divided into the following.

(Row 1) Separates the iron and drain material to prevent contact between the two.

(Row 2) Water flows down onto the contact surface between the iron and the drain material to reduce frictional resistance.

However, in all of the above methods, the penetration rod of the mandrel rod was not rotated and penetrated into the ground only by thrust force, so if there is a hard interstitial layer between the ground surface and the depth to be improved, it is difficult to penetrate the ground. This makes it difficult to achieve the purpose of placing drain material.

In such cases, it may be possible to use a water jet, but this method also has the disadvantage that it cannot be used in locations where water cannot be used.

Furthermore, most of conventional drain material driving machines are quite dog-shaped, since small-sized ones have a small driving force and are inferior in the depth that can be driven.

For this reason, it was impossible to use driving machines in the mountains, where it was difficult to transport machines, or in areas with undeveloped roads.

Among the methods for placing horizontal drains, methods that do not involve preliminary drilling, which were proposed early on, have the problem that it is difficult to fix the driving machine because the horizontal force acting is large.
Not put into practical use.

On the other hand, a method has been proposed (Utility Application No. 75783/1983) in which a bearing block with a projection for hooking the drain material is installed in a part of the X-rod while performing preliminary excavation. If there is an obstacle such as gravel in the drain, there is a problem that the drain material may be cut or the medical projection may hit the obstacle and become impossible to cast.

The present invention was made to solve the problems of the conventional method described above, and its purpose is to facilitate the installation of drain material, which was difficult with the conventional method, regardless of whether it is a vertical drain or a horizontal drain. It is something.

Embodiments of the present invention will be described below with reference to the drawings in the case of horizontal drain installation.

In the figure, 1 is a continuous cardboard-shaped drain material, and 2 is a ground on which the drain material 1 is to be placed.

In the present invention, first, as shown in FIG. 3, a hollow cylindrical casing 4 having a hollow cylindrical bit (metal crown) 3 fixed to the tip thereof is placed in a poling machine (not shown).
excavate while rotating and push it into the ground 2,
The excavation is carried out to a depth shallower than the predetermined depth at which the drain material 1 is to be cast.

Note that the excavation using the casing 4 may be performed by any method other than dry excavation, such as air excavation in which compressed air is injected, water excavation in which pressurized water is injected.

In this example, air digging was performed.

When the excavation by the casing 4 reaches a predetermined depth,
A chuck (not shown) of a polling machine is removed from the casing 4 while leaving the casing 4 in the earth 2, and a tubular rod 5 that can be inserted into the casing 4 is gripped by the chuck.

An anchor 6 to which the drain material 1 is fixed is removably fitted to the tip of the rod 5.

That is, the anchor 6 has a conically pointed tip 6a, a constriction 6c in the middle of a cylindrical body 6b, and a rear end shank 6d that can be fitted into and removed from the rod 5.

The drain material 1 is fixed by applying the tip of the drain material 1 to the constriction 6c of the anchor 6 and securing it with a wire 7 or the like.

As shown in FIGS. 1 and 2, an air injection pipe 8 may be inserted between the 0' throat 5 and the anchor 6 if necessary.

This air injection pipe 8 is connected to the rear end shank portion 6d of the anchor 6.
The rod 5 can be removably inserted into the tip 8a, and has a threaded portion 8b at the rear end to be screwed into the tip of the rod 5. A partition 8c is provided inside, and a pipe behind the partition 8c is provided. Air injection holes 8d directed diagonally forward are provided in the wall.

Next, the rod 5 with the anchor 6 fitted at its tip is pushed into the casing 4 so that the anchor 6 reaches a predetermined depth deeper than the tip of the casing 4, as shown in FIG.

In the case of this embodiment, this insertion could be performed by hand alone, without using a Pauling jack, to a depth of about 15 m, which is close to the depth at which the casing 4 was pushed.

At this time, as shown in Fig. 1, after the excavation with the casing 4 is completed, the front surface of the face collapses, so the inside of the bit 3 and the casing 4 are filled with earth and sand 2a, and even when press-fitted with a jack, the specified depth cannot be reached. If it is not possible to insert the anchor 6 and rod 5 up to the
By injecting pressurized air diagonally forward from the air injection hole 8d of the air injection pipe 8 through the air injection pipe 8, the earth and sand 2a can be removed and the anchor 6 can be inserted to a predetermined depth.

Next, while pressing the rod 5 with a jack, the casing 4 is pulled out using a winch (not shown) of a polling machine as shown in FIG.

If the casing 4 cannot be pulled out using the winch alone because the resistance is too great, use the jack that pushed the rod 5 to grip the casing 4, and use the jack to pull out the recasing 4.

When the rod 5 is then pulled out using the winch or jack of the polling machine, the drain material 1 is left in the ground 2 connected to the anchor 6 as shown in FIG.

Depending on the conditions of the target ground, or if the diameter of the casing 4 is considerably larger than the diameter of the rod 5, it may be better to leave the casing 4 in place and pull out the rod 5 first, then pull out the casing 4. There is no need to change the chuck from the rod to the casing, improving efficiency.

Next, a test conducted to compare the conventional method and the method of the present invention will be explained.

Location: Kagoshima Prefecture, Oguchi City, Ushio Ushio Mine 2nd Depot Polling machine used: Weight 1.2 tons, prime mover 11.5KW Casing used: 85 mm φ Rondo used: 40.5 mm φ Drain material used: Cattle board width 100 mm for waste removal Method: Anchor using air: 50 ψ, total length 7001n7ft Compressor used: Discharge pressure 7 kg/cr! Discharge amount 1 0.
5 m3/mvr From the above test results, it can be seen that the present invention is effective even in cases where conventional methods are difficult to construct, and that when used in combination with conventional methods, it is possible to further improve drain performance.

Furthermore, when applying the present invention to the vertical drainage method,
If the spindle of the polling machine is set vertically and used in the X direction, pouring can be done in the same way as horizontal drain pouring.

In addition, it is also possible to use the method of the present invention to install drain material from the horizontal or at an upward slope of X, which is said to be effective for draining water from the back of a slope. , it has an excellent effect in that it has a wide range of application.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the tip of the drain casting device of the present invention, and Fig. 2 is a cross sectional view taken along line A-A of the air injection pipe.
6 to 6 are process explanatory views of the drain installation method of the present invention. 1... Drain material, 2... Earth, 3...
...Bit, 4...Casing-5...
...Rondo, 6...Anchor, 6a...
...Tip, 6b...Body, 6C...
Neck part Jd... Rear end shank part, 7...
...Wire, 8...Air injection pipe, 8a...
・Tip part -8b...Threaded part -8c...
Partition wall, 8d... injection hole.

Claims (1)

[Claims] 1. Push the casing into the ground to a predetermined depth while rotating, fix the tip of the drain material to the anchor, and removably fit the anchor to the tip of the iron. The iron is inserted into the inside of the casing to penetrate the anchor to a desired depth, and then the iron is pulled out with the anchor left in the ground, thereby leaving the drain material underground. Drain installation method. 2. A rotary excavation casing with a bit at the tip, a rond that can be inserted into the casing and pushed the tip into the ground, and a constriction for fixing the drain material to the body with a pointed tip. , and an anchor whose rear end shank portion is removably fit into the rond. 3. The rear end shank of the anchor for fixing the drain material to the tip of the hollow cylindrical body can be removably inserted, and the rear end of the hollow cylindrical body can be connected to the tip of the iron, and A partition wall is installed inside this hollow cylinder. A drain according to claim 2, wherein a fluid injection hole is provided in the pipe wall behind the partition wall to form a fluid injection pipe, and the fluid injection pipe is connected to the hollow tip of the iron. Timber pouring equipment.