JPH0533556Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The invention is based on the following method: After placing a belt-shaped drain material made of non-woven fabric in damp ground, the casing at the tip of the drain material casting device is removed from the ground. This invention relates to a device for preventing drain material from rising together when the drain material is pulled up.

<Conventional technology> Sand drain method, paper drain method, etc. are used to improve the ground by installing vertical drainage columns in soft ground, draining excess water in the soil, promoting consolidation of the ground, and solidifying the ground. There is. These construction methods are
In either case, the drain material must be driven deep into the ground almost vertically using a driving device.

It is difficult to drive drain material deep into the ground unless it is protected by a cylindrical casing, and when the casing is pulled up, the drain material also rises. Sometimes.

As a conventional technique for preventing this drain material from rising together, as described in Japanese Utility Model Application Publication No. 60-62542, it is common to cast the drain material with an anchor attached to its tip. It was hot. However, since it requires a great deal of labor and time to attach anchors to the tips of drain materials each time, work efficiency is poor when a large number of drain materials are cast. For this reason, as described in Japanese Utility Model Application No. 60-186339, the lower end of the mandrel has a double-tube structure, and the inner tube is biased with a spring so that it can protrude downward from the outer tube. A device has been developed to prevent drain material from rising together, in which the inner tube is pushed out below the outer tube by a spring when the drain material starts to be pulled up.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional upwelling prevention device, when the mandrel is driven into the ground, earth and sand enters through the opening at the tip of the inner pipe and becomes clogged. For this reason, the frictional force between the drain material and the inner pipe increases,
Even if the mandrel begins to rise and only the outer tube rises and the inner tube protrudes below the outer tube due to the bias of the spring,
After that, when the inner pipe rises together with the outer pipe, the frictional force between the drain material and the inner pipe is large, and the contact area between the drain material and the surrounding earth and sand is small, so the resistance force that tries to leave the drain material underground is weak. Therefore, no drain material remains and all the drain material comes up together.

<Means for Solving the Problems> The present invention was proposed in view of the above, and a sliding member is attached to the tip of the inside of a hollow casing that has a passage extending through the drain material in the length direction. In addition to being provided so that it can slide freely along the horizontal direction,
A biasing member biases the sliding member in the direction of protruding from the opening at the distal end of the casing, and a protrusion is formed at the distal end portion of the passage side side surface of the sliding member.

<Function> When the sliding member retracts into the casing due to resistance when driving into the ground, the drain material passed through the passage is clamped between the protruding part of the sliding member and the inner surface of the passage, blocking the tip opening. Therefore, it is possible to prevent soil from entering through the tip opening.

When the casing is pulled up, only the casing begins to rise, and the tip of the sliding member begins to protrude to the outside of the casing together with the drain material due to the force.When the sliding member protrudes sufficiently, the drain material also extends from the casing. They go outside and come into contact with the surrounding earth and sand. Therefore, even if the sliding member starts to rise together with the casing, the contact with the surrounding earth and sand acts on the drain material as a resistance force, and prevents the drain material from rising together.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIG. 1, the drain material 1 placing device 2 includes a tower 4 erected on a base 3, and a casing guide roller 5 . . . and a drain material guide chute 6 provided on the tower 4. , above tower 4
A pair of pinion gears 8, 8 which are rotationally driven by a drive source 7 such as a hydraulic motor are provided at the base of the base 3, and a drain material supplying device 9 for feeding a coiled drain material 1 is provided at the tip of the base 3. The casing 10 is vertically movably supported by the casing guide rollers 5 . The drain material 1 sent out from the drain material guide chute 6 is guided to the upper end of the tower 4, and the drain material 1 is passed through the inside of the casing 10 from the upper end opening of the casing 10, and the lower end of the drain material 1 is connected to the lower end of the casing 10. It is configured to protrude from the opening. In order to drive the casing 10 into the ground, the pinion gears 8, 8 are rotated to forcefully lower the casing 10.

The casing 10 is a long hollow plate-like member in which a road 12 for passing the drain material 1 is formed along the length direction, and rack gears 11, 11 that mesh with pinion gears 8, 8 are provided on both sides. , and the lower end portion thereof is equipped with a device for preventing the drain material from rising according to the present invention.

The device for preventing the drain material from rising is the casing 10.
A sliding member 13 is provided facing the passage 12 at the lower end of the casing 10 so as to be slidable along the length direction of the casing 10, and a biasing member 14 such as a coil spring is provided.
This biases the sliding member 13 in the direction of protruding from the lower end opening of the casing 10. The sliding member 13 is a plate-shaped member whose width is slightly narrower than the width of the passage 12, and the side surface facing the passage side of the tip that can protrude from the lower end opening of the casing 10 has a part in the middle of its length. The thickness of the plate is increased smoothly to form the protruding part 1.
5, and a stepped stopper 16 is formed near the upper end.

The biasing member 14 that biases the sliding member 13 is
In the embodiment shown in the drawings, a shielding plate 17 is provided inside the casing 10.
Two thin coil springs are arranged in parallel in a storage chamber 18 divided by , one end is brought into contact with the casing 10 side, and the other end is fixed to the upper end of the sliding member 13.

Further, on the inner surface of the passage 12 facing the sliding member 13 near the lower end opening of the casing 10, an inclined receiving surface 19 is formed at approximately the same angle as the inclined pressing surface 15' of the protrusion 15 of the sliding member 13. Form.

The drain material 1 is
To drive the casing 10 into the ground, the casing 10 is raised until the lower end of the casing 10 is separated from the ground surface. When the casing 10 is raised in this way,
Due to the urging force of the urging member 14, the lower end portion of the sliding member 13 protrudes from the lower end opening of the casing 10,
The stopper 16 at the upper end comes into contact with the stepped portion 20 of the casing 10 and stops. Then, the distal end portion of the drain material 1 is made to protrude from the lower end opening of the casing 10, and the distal end of the drain material 1 is folded back and placed over the distal end of the sliding member 13.

Next, when the casing 10 is lowered by the rotation of the pinion gears 8, 8, the tip of the sliding member 13 comes into contact with the ground surface, and when further lowered, the sliding member 13 resists the urging force of the urging member 14. It gradually retreats into the casing 10, and when it retreats sufficiently, the sliding member 1
The inclined pressing surface 15' of the protrusion 15 of No. 3 presses the drain material 1 against the inclined receiving surface 19 to sandwich the drain material 1, and also seals the lower end opening of the casing 10 with the drain material 1.

Then, when the casing 10 is further lowered, as shown in FIG. 8, the casing 10 and the sliding member 1
The 3 unite and push through the underground. Even if the casing 10 is forcibly driven into the ground in this way,
Since the lower end opening of the casing 10 is closed by the drain material 1 held between the protrusions 15 of the sliding member 13, earth and sand etc. do not enter the passage 12 from the lower end opening of the casing 10.

After driving the casing 10 to a predetermined depth as described above, when the pinion gears 8, 8 are reversely rotated, the casing 10 starts to rise as shown in FIG. The casing 10 is stopped at that position by the biasing force 14, and the tip portion protrudes from the lower end opening by the amount that the casing 10 has risen. Then, the tip of the sliding member 13 is connected to the biasing member 14.
Since the lower end of the drain material 1 is pressed downward by the urging force, the drain material 1 remains in that position together with the sliding member 13. That is, the drain material 1 relatively descends within the passage 12 of the casing 10.
Then, when the drain material 1 begins to move within the passage 12, the passage 12 of the casing 10 and the drain material 1
The frictional resistance between the object and the object is reduced compared to when it is stationary. When the casing 10 is further raised in a state where the frictional resistance with the drain material 1 is reduced, the tip of the sliding member 13 fully protrudes together with the drain material 1, and the stopper 16 at the upper end is moved to the receiving part 20 of the casing 10. comes into contact with. Then, when the casing 10 is further raised, as shown in FIG. 10, since the stopper 16 is in contact with the step portion 20, the sliding member 13 is raised together with the casing 10. At this time, in addition to the above-mentioned reduction in the frictional force, a large area between the outer side (opposite side of the sliding member 13) and the folded lower end portion of the drain material 1 pulled out to the outside of the casing 10 is reduced. The covered earth and sand
Since it acts as a resistance when the drain material 1 rises, even if the sliding member 13 rises, the drain material 1
remains underground and does not rise together with the sliding member 13.

In this way, the drain material 1 is left underground, the casing 10 is further raised to the ground, and the drain material 1 protruding from the lower end opening of the casing 10 is cut.
The pouring work is completed. Therefore, the placing machine can be moved to the next predetermined location.

In the work of placing the drain materials 1, the above-described operations are repeated for each predetermined position, thereby sequentially placing the drain materials 1...

<Effects of the Invention> As explained above, according to the present invention, it is possible to save the trouble of attaching an anchor each time a drain material is driven, and it is possible to reliably prevent the drain material from rising together. Therefore, there is no need to re-cast the drain material again, and the efficiency of the work can be significantly improved compared to conventional casting work.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a drain material casting device, Fig. 2 is a partially cutaway front view of the casing, and Fig. 3 is a front view of the lower end of the casing. Figure 4 is a cross-sectional view of the casing shown in Figure 3, Figure 5 is a cross-sectional view taken along line A-A of the casing shown in Figure 3, Figure 6 is a cross-sectional view taken along line B-B, and Figure 7 is a cross-sectional view taken along line C-C. 8 is a sectional view of the sliding member in a state where it has retreated into the casing; FIG. 9 is a sectional view of the sliding member in the middle of protruding;
FIG. 10 is a sectional view in a state where the sliding member begins to rise together with the casing. In the figure, 1 is a drain material, 2 is a driving device, 3 is a base, 4 is a tower, 8 is a pinion gear, 10 is a casing, 11 is a rack gear, 12 is a passage, 13 is a sliding member, and 14 is a biasing member. member, 15 is a protrusion, 1
5' is an inclined pressing surface, 16 is a stopper, 19 is an inclined receiving surface, and 20 is a receiving step.

Claims (1)

[Scope of utility model registration request] A sliding member is provided at the tip of the inside of a hollow casing having a passage extending through the drain material in the length direction so as to be slidable along the length of the casing, and a biasing member is used to push the sliding member into the casing. biasing the sliding member in a direction protruding from the tip opening, forming a protrusion at the tip portion of the passage-side side surface of the sliding member;
A device for preventing drain material from rising up, characterized in that when the sliding member retreats into the casing, the drain material passed into the passage is held between the protrusion and the inner surface of the passage.