JPH0621946Y2 - Drain material holding device for board drain method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a drain material holding device used for soil improvement method for soft ground, particularly for board drain method.

(Prior art) The board drain method is used to penetrate a drain mandrel made of paper fibers (paper drain material) or a polymer chemical material (PCV drain material, castle drain material, geodrain material, etc.) into a hollow mandrel. It is a construction method that inserts it into the soil with a mandrel and then pulls out only the mandrel to drain the pore water in the soil through the drain material remaining in the soil and strengthen the ground. . By the way, in this type of board-drain construction method, it has been an important issue how to make the drain material follow the mandrel and drive it into the soil, and also to separate it from the mandrel and leave it in the soil. Various attempts have been made.

FIGS. 4 (a) to (c) show specific examples thereof.
For example, in the case shown in FIG. 1A, in the vicinity of the drain material insertion hole 2 provided at the lower end of the mandrel 1,
A foldable trough member 4 is attached to the lower end of the drain material 3, and after driving into the soil together with the mandrel, the resistance of the trough member 4 is used to leave the drain material in the soil. In the case shown in b), the inverted T-shaped trough member 5 is attached to the lower end of the drain member 3, and the trough member 5 is also attached.
Of the drain material 3 is curved in a U-shape along the outer peripheral surface of the mandrel 1 and driven into the soil. The resistance of the drain material itself is used to leave this in the soil.

(Problems to be solved by the invention) However, according to the above-mentioned conventional driving method, in the case of the one shown in FIGS. Therefore, there is a problem that not only the extra cost is required for its manufacture, but also it takes time to attach it to the drain material 3 and the construction efficiency is lowered. On the other hand, in the case of the one shown in FIG. There is a risk that the drain material 3 may be cut due to ground resistance, and since earth and sand enter the mandrel 1 through the drain material insertion hole 2, a troublesome removal work is required.

The present invention has been made in view of the above conventional problems,
It is an object of the invention to provide a drain material holding device capable of highly efficiently and reliably driving a drain material into the soil and leaving the drain material in the soil.

(Means for Solving Problems) Therefore, according to the present invention, a mandrel having a drain material insertion hole at a lower end thereof, a pushing rod inserted into the mandrel so as to be movable relative to the mandrel, and a lower end of the mandrel. And a lid that is rotatably attached to the opening and closing the drain material insertion hole and that cooperates with the pushing rod to hold the drain material in the closed state, and an opening and closing lid that is disposed in the mandrel. The gist is that it is configured so as to include a driving unit that operates.

(Operation) In the drain material holding device for the board / drain construction method having the above configuration, if the drain material is inserted into the mandrel and the opening / closing lid is operated by the driving means to close the drain material insertion hole, the drain material is pushed into the opening / closing lid. It is automatically sandwiched between the rod and the rod, and the drain material can be reliably driven into the soil. Also, after driving, if the mandrel and the pushing rod are moved relative to each other while the opening / closing lid is opened, the lower end of the drain material is pushed into the soil by the pushing rod, and the drain material is taken up by the mandrel. It becomes possible to leave it in the soil without any problems. That is, the drain material can be easily and surely driven into the soil without using special consumable parts.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 11 denotes a hollow mandrel having a flat lower end, and a bottom plate 13 having a drain material insertion hole 12 that changes from the center to one side is joined to the lower end of the mandrel 11. Has been done. The bottom plate 13 has a rectangular bush 14 so as to fill one side of the drain material insertion hole 12.
Is fixed vertically, and one end of a flat plate-shaped pushing rod 15 is slidably fitted to the bush 14. The pushing rod 15 has an upper end supported by a driving means (not shown) and can move relative to the mandrel 11, and its lower end is always positioned so as to substantially coincide with the lower end of the mandrel 11. Has become.

An open / close lid 16 is rotatably attached to the lower end of the mandrel 11. That is, the opening / closing lid 16 includes the mandrel 11
A lid body 17 located below the bottom plate 13, a support plate 18 extending from both sides of the lid body 17 along the outer periphery of the mandrel 11, and a support body 18 rotatably mounted on the mandrel 11 to integrally connect the support plate 18 to each other. And a shaft body 19, and by rotating the shaft 19 as a fulcrum, the drain material insertion hole 12 is opened / closed and the lid body is closed in a state in which the drain material insertion hole 12 is closed.
The drain member 20 can be held between the pushing rod 15 and the front end portion of the drain member 20.

Thus, the shaft 19 is connected to a cylinder 22 installed inside the mandrel 11 via a pair of connecting arms 21. One end of the connecting arm 21 is non-rotatably attached to the shaft 19 by a key 23, and the other end is rotatably attached to a piston rod 24 of a cylinder 22 by a pin 25. That is, when the piston rod 24 retracts from the state shown in FIG.
21 rotates clockwise, and the opening / closing lid 16 also rotates clockwise following this, and the lid body 17 of the lid body 17 is provided with a drain material insertion hole.
You will be able to open 12.

Hereinafter, regarding the operation of the drain material holding device having the above configuration,
This will be described with reference to FIGS. 3 (a) to 3 (d). First, the mandrel 11 is mounted on a driving machine (not shown), and the drain member 20 is inserted into the mandrel 11 by operating a feeding device (not shown). At this time, as shown in FIG. 5A, the opening / closing lid 16 is opened by the operation of the cylinder 22, and the lower end of the pushing rod 15 is aligned with the lower end of the mandrel 11 to position the drain member 20. One end of the mandrel 11 is slightly projected from the lower end. Then, the cylinder 22 is actuated to rotate the opening / closing lid 16 in the closing direction. Then, as shown in FIG. 3B, the drain material insertion hole 12 is closed by the opening / closing lid 16.
At the same time, the drain material 20 is firmly sandwiched between the lid body 17 and the pushing rod 15, and one end portion of the drain material 20 is in a state of being laterally curved. Under this condition, when the mandrel 11 is driven into the soil by the operation of the driving tool, the drain material 20
Is firmly sandwiched between the pushing rod 15 and the opening / closing lid 16, and is not cut during the driving.

Then, after driving the mandrel 11 to a predetermined depth, the same figure (c)
As shown in FIG. 6, the opening / closing lid 16 is rotated in the opening direction by the operation of the cylinder 22 again, and then only the mandrel 11 is pulled out as shown in FIG. As a result, the pushing rod 15 is relatively lowered, and as a result, the tip end portion of the drain member 20 is pushed into the soil and is not taken up by the mandrel 11. If you pull out,
It will definitely be left in the soil. In the above embodiment, after the driving is completed, only the mandrel 11 is pulled out, but the mode is arbitrary, for example, the mandrel 11 is fixed so that the pushing rod 15 can be moved downward.
Or move the mandrel 11 upward and at the same time push rod
You can move 15 down.

(Effects of the Invention) As described above in detail, in the drain material holding device according to the present invention, the pushing rod is inserted into the mandrel so as to be movable relative thereto, and the drain material is inserted into the lower end of the mandrel. Since the opening / closing lid that opens and closes the hole and cooperates with the pushing rod to sandwich the drain material is provided, the drain material can be held through the process of driving into the soil, and the reliable driving can be performed. effective. Also, after driving, by moving the mandrel and the pushing rod relatively, the drain material can be pushed into the soil by the pushing rod and the drain material will not be taken up by the mandrel. There is an effect that it can be left securely in the. Furthermore, since it is possible to drive the drain material into the soil without using consumable parts as in the conventional case, it is possible to omit extra work for mounting the consumable parts.
This has the effect of improving the driving efficiency of the drain material.

Further, since the opening / closing lid is forcibly driven by the driving means and the drain member can be automatically sandwiched between the pushing rod,
Not only can the time required for advance preparation be greatly reduced, but it can also be applied to underwater construction, which has a great effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a main part of a drain material holding device for a hoard drain construction method according to the present invention, FIG. 2 is a front view of the same, and FIGS. 3 (a) to 3 (d) are the drain material. Explanatory drawing which shows the usage mode of a holding | maintenance apparatus in order of a process, FIG.
(C) is explanatory drawing which shows the conventional drain material holding aspect in a board drain construction method. 11 …… Mandrel 12 …… Drain material insertion hole 15 …… Pushing rod 16 …… Opening / closing lid 20 …… Drain material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiichi Goto 5-1, Koraibashi, Higashi-ku, Osaka City, Osaka Prefecture Toyo Construction Co., Ltd. (56) References JP-A-48-79411 (JP, A) JP-A-SHO 50-133617 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A hollow mandrel having a drain material insertion hole at a lower end thereof, a pushing rod inserted through the mandrel so as to be relatively movable therein, and a drain rotatably attached to a lower end portion of the mandrel. An opening / closing lid that opens and closes the material insertion hole and cooperates with the pushing rod to hold the drain material in the closed state; and a drive unit that is disposed in the mandrel and that opens and closes the opening and closing lid. Drain material holding device for the characteristic board drain method.