JPH0651966B2 - Drain material placing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Field of Industrial Application >> The present invention relates to a drain material placing device for leaving a drain material in the ground.

<Prior art> As is well known, there is a drain construction method as an improvement method for soft ground.In this type of construction method, paper, synthetic resin, non-woven fabric, etc. are used as drain materials, and these drain materials are left in the ground and drained. This is a method of concentrating the surrounding ground detention water on the timber and eliminating it to promote early subsidence and improve the ground.

In the operation of placing the drain material, the hollow cylindrical casing having the drain material inserted therein is penetrated to a predetermined depth in the ground by vibration or pressure, and then only the casing is pulled out to leave the drain material in the ground.

By the way, as one of the important technical problems in this construction method, there is a so-called co-raising phenomenon in which the drain material is pulled up together when the casing is pulled out, and if this phenomenon occurs, the desired ground improvement effect cannot be obtained. .

For this reason, various measures against rising up have been conventionally provided, and for example, a drain material holding device as disclosed in Japanese Utility Model Laid-Open No. 62-133728 has been proposed.

This device is provided with a lid at the tip of the casing for fixing the drain material protruding from the casing in a folded state, and a push rod inside the tip of the casing that can be retracted from the casing.

Then, in this placing device, when closing the lid, the drain material is folded and fixed to the tip of the casing, and in this state, it penetrates to a predetermined depth in the ground, then the lid is opened and the pushing rod is projected. Then, the U-shaped bent portion formed at the tip of the drain material is pushed deeper into the ground, and the pushing rod and the casing are raised in that state to leave the drain material in the ground due to the anchor effect of the drain material itself. I am trying to do it.

<Problems to be Solved by the Invention> However, in this device, since the pushing rod is operated by the cylinder, hydraulic or pneumatic piping for driving the cylinder is required, and the entire device becomes large and There is a problem that the shape becomes large.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and provides a placing device capable of leaving a drain material in the ground with a relatively simple structure without increasing the size and weight of the device. The purpose is to

<Means for Solving the Problem> In order to achieve the above-mentioned object, the present invention has a hollow cylindrical casing that penetrates the drain material and penetrates into the ground, and is openable and closable disposed at the tip of the casing. The lid and the drain are installed in the casing such that the drain can be retracted into the casing, and when the casing is penetrated to a predetermined depth, the drain is locked to the tip of the lid and the drain member is attached to the outside of the tip of the casing. In a device for driving a drain material having a mandrel protruding up to, while suspending the mandrel with a wire, suspending a counterweight heavier than the mandrel at the other end of the wire, and A first stopper for stopping the descent at a predetermined position and a second stopper for restricting the rising position of the mandrel are provided.

<< Operation >> According to the placing device having the above configuration, since the mandrel installed in the casing is suspended via the counterweight heavier than this and the wire, until the counterweight contacts the stopper, The position regulated by the second stopper is maintained.

When the penetration of the casing into the ground progresses and the counterweight descends and comes into contact with the first stopper, the mandrel penetrates into the ground together with the casing with the wire loosened by its own weight.

Then, when the casing is penetrated to a predetermined depth and pulled up, the mandrel has loose wires, so that position is maintained, the lid is released by the weight of the mandrel, and the drain member is attached to the tip. When stopped, it projects outward from the tip of the casing.

The protruding length of the mandrel at this time corresponds to the slack length of the wire, and when the casing is further pulled up and the slack of the wire disappears, the mandrel rises together with the casing, whereby the drain material is left in the ground. It

<< Embodiment >> An embodiment of the present invention will be described below in detail with reference to the drawings.

1 and 2 show one embodiment of a drain material placing device according to the present invention.

The placing device shown in the figure includes a hollow cylindrical casing 12 into which the drain material 10 is inserted, a lid 14 arranged at the tip of the casing 12, and a mandrel 16 installed inside the casing 12. I have it.

The casing 12 has a circular cross section over substantially the entire length, and the tip 12a is reduced in diameter to a flat taper shape, and the lid 1 is provided on one side surface of the tip 12a via a pin 18.
4 is attached so as to be openable and closable, and the center of gravity of the lid body 14 is outward with respect to the vertical line G1 of the pin 18 when it is released, as shown by the diagonal lines in FIG. It is set, and its tip is always a vertical line G in the released state.
It is configured to be inside 1.

The mandrel 16 has a base portion 16b in which an insertion hole 16a for the drain member 10 is formed along the axial direction, and a rod portion 16c in which one side surface extends downward along one surface of the insertion hole 16a. And a projection 16d projectingly provided on the lower end surface of the rod portion 16c for locking the drain member 10.

In addition, inside the casing 12, the mandrel 16
A stopper 20 that abuts on the rear end of the base portion 16b and regulates the rising position of the base portion 16b is fixed. It is set to match.

The mandrel 16 configured in this manner is suspended via the wire 22, the other end side of the wire 22 extends upward, and is wound around the rotary sheave 24 installed at the upper end of the casing 12, and the other end thereof is wound. A counterweight 26, which is heavier than the weight of the mandrel 16, is suspended in the.

The counterweight 26 is provided with a through hole 28, and the through hole 28 is fixedly provided with a leader guide 29 for supporting the casing 12 so as to be vertically movable.
A guide rope 32 having both ends fixed to 0 and stretched in the vertical direction is inserted, and a stopper 34 for restricting the descending position of the counterweight 26 is attached to the guide rope 32.

As shown in FIG. 2 (B), the stopper 34 includes a stopper plate 34b provided with a notch 34a for inserting the guide rope 32, and a mounting rod 34c fixed to the lower surface of the stopper plate 34b. And the mounting rod 34
c is attached to the guide rope 32 and fixed by a wire clip 36, and the fixing position can be changed by loosening the wire clip 36.

The device indicated by the reference numeral 38 in FIG.
It is an exciter for penetrating into the ground 40.

FIG. 2 shows a state in which the drain material 10 is driven by the driving device.

In placing the drain material 10, first, the drain material 10 is fed out by a predetermined length, the mandrel 16 is housed in the casing 12, and the casing 12 is penetrated into the ground 40 by the vibrator 38.

When the casing 12 gradually descends and the lid 14 reaches the surface of the ground 40, the lid 14 is automatically closed as the casing 12 descends because the center of gravity of the lid 14 is set as described above. The drain material 10 has its tip bent into a substantially L-shape, so that the end is exposed from the gap between the lid 14 and the casing 12.

When the lid 14 is closed in this way, the drain member 1
0 is the inner surface of the lid 14 and the rod portion 16 of the mandrel 16.
When the drain material 10 is a paper drain material such as a non-woven fabric, it is clamped between the protrusion 16d of c and the projection 16d, and is locked so as to bite into it.

Here, the mandrel 16 installed in the casing 12
Is a heavier counterweight 26 and wire 22
Since the counterweight 26 is suspended through the counterweight 26,
Since the gravity acting on is large, the position regulated by the stopper 20 is maintained.

Then, when the penetration of the casing 12 into the ground 40 progresses and the counterweight 26 descends accordingly and comes into contact with the stopper 34, the gravity of the counterweight 26 does not act on the mandrel 16 thereafter. The mandrel 16 penetrates into the ground 40 together with the casing 12 in a state where the wire 22 is slackened by its own weight.

When the casing 12 is penetrated to a predetermined depth and pulled up, the mandrel 16 keeps its position because the wire 22 is slack, and the mandrel 16 releases the lid body 14 by its own weight, and the rod portion 16c. The drain member 10 is projected outward from the front end of the casing 12 while the drain member 10 is locked to the front end of the casing 12.

Since the protruding length of the mandrel 16 at this time corresponds to the loose length of the wire 22, the position where the counterweight 26 contacts the stopper 34 is at the rod portion 1.
Considering the length of 6c, for example, it is set several tens of cm to 1 m before the remaining depth of the drain material 10.

Since the projection 16d of the mandrel 16 is in contact with the surface of the drain member 10 against such relative movement,
The drain material 10 is prevented from slipping.

When the casing 12 is further pulled up and the slack of the wire 22 is eliminated, the mandrel 16 begins to rise together with the casing, and the surrounding earth and sand collapse into the cavity 30 generated by the casing 12 being pulled up, and the tip portion of the drain material 10 is Embedded by earth and sand.

As the casing 12 is pulled up, the mandrel 1
Since the gravity of the counterweight 26 acts on 6, the mandrel 16 is lifted up until its base portion 16b abuts on the stopper 20, and after the mandrel 16 abuts on the stopper 20, the counterweight 26 separates from the stopper 34 and Preparation for the driving cycle is done.

Now, when the drain material 10 is driven by the above-mentioned device, the drain material 10 is attached to the rod portion 16c of the mandrel 16.
Since the projection 16d that comes into contact with the drain member 1 is provided,
It is possible to surely leave 0 in the ground 28 without causing 0 to go up with the casing 12.

Further, since the drain material 10 is driven by using gravity, the structure of the device is simplified and the entire size and weight can be reduced.

<< Effects >> As described in detail in the above embodiments, according to the drain material placing device of the present invention, the mandrel is operated by utilizing gravity, so that the structure is simplified and the entire device is increased in size or It is possible to avoid the increase in weight and to save energy, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is an overall view of a draining material placing device according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is when placing a draining material into the ground using the same device. FIG. 10 ... Drain material 12 ... Casing 14 ... Lid 16 ... Mandrel 20 ... Stopper (second) 26 ... Counterweight 34 ... Stopper (first)

Claims (1)

[Claims] 1. A hollow cylindrical casing that penetrates into the ground through a drain material, an openable / closable lid body arranged at the tip of the casing, and a retractable lid installed in the casing. A drain material placing device, comprising: a mandrel that releases the lid body and projects the drain material locked to the tip portion to the outside of the tip of the casing when the casing is penetrated to a predetermined depth. , A first stopper that suspends the mandrel with a wire, suspends a counterweight heavier than the mandrel at the other end of the wire, and stops the descending of the counterweight at a predetermined position; and the mandrel. And a second stopper for restricting the rising position of the drain material.