JPH0141778Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on the idea that when a paper drain for improving soft ground is housed in a casing and driven into the ground, it is attached to the tip of the paper drain, and when the casing is pulled out, the anchor effect The present invention relates to a tip member for a paper drain that prevents drains from rising together.

When installing a paper drain, the casing with the paper drain inserted through it is driven into the ground, and then only the casing is pulled out, leaving the paper drain in the ground. It is necessary to take measures to prevent this.

Conventionally, as shown in FIG. 8, for example, a synthetic resin tip member 11 having an anchor-shaped cross section is fixed to the tip of a paper drain 4 pulled out from the lower end of a casing 3 with staples 5, and the earth pressure acting on the tip member is fixed. In order to prevent paper drains from rising together, it is being done.

However, mud entered between the tip member 11 and the tip of the casing 3, and the opening 31 of the casing 3
Mud gets clogged in the space between the and paper drain 4, or the tip member 11 is crushed and the opening 31 of the casing 3 gets clogged with mud, and the tip member 11 is fixed to the casing, causing the casing 3 to become clogged. At the time of withdrawal, the tip member 11 and the paper drain 4 may also rise together.

(Purpose) The object of the present invention is to provide a tip member for a paper drain that is simple in shape, easy to install, and does not impair the effect of preventing co-up.

(Structure) A plurality of parallel slits 2, 2 through which the paper drain 4 can be inserted are provided in a hard plate 10 large enough to cover the opening 31 at the lower end of the casing for driving the paper drain, and each slit is on the same side. The end portion of the plate 10 is opened at the edge of the plate 10.

(Operation and Effect) Pull out the paper drain from the opening at the bottom end of the casing, fit it into the slit in the tip member, and fold it back.
The tip member is locked to the paper drain by friction, eliminating the need for conventional locking with staples. When driving the casing into the soil with the tip member covering the opening of the casing, the plate surface of the tip member is in close contact with the edge of the opening of the casing, so mud may enter between the tip member and the edge of the opening of the casing. There is no risk of the paper drain being fixed to the casing due to mud getting stuck between the opening of the casing and the paper drain as in the conventional case.

Each slit 2 is opened in parallel, and the ends of the slits on the same side are opened at the edge of the plate 10, so that
Workability is good because the paper drain can be folded back in advance and inserted into the slit 2 from the side of the board.

Furthermore, since the paper drain passes through one slit from top to bottom and the other slit from bottom to top, there is no risk of the tip member coming off from the paper drain.

When the casing is pulled out, the tip member and paper drain remain in the soil due to the earth pressure applied to the tip member.
Shared upflow of paper drains is prevented.

The tip member has a simple shape and can be easily manufactured by creating slit grooves in a metal plate by gas cutting, press processing, cutting with a rotary cutter, etc., and can reduce costs.

(Example) The present invention will be specifically described below based on an example shown in the drawings.

The tip member 1 shown in FIG. 1 is formed by a substantially rectangular hard plate 10 with two slits 2 , 2 opened parallel to the longitudinal side edges of the plate 10 .

The plate 10 is made of iron plate or hard plastic, and its size is larger than the lower end opening 31 of the driving casing 3 and smaller than the cross-sectional shape of the body 32 of the casing. In the example, the length of the long side of the plate 10 is 150 to 200 mm, the length of the short side is 50 to 100 mm, and the thickness is 3 to 10 mm, but in the case of a large casing for submarine driving, the length of the plate 10 in the longitudinal direction is 500 mm. ~1000mm, and the thickness increases accordingly.

The width of each slit 2 is slightly larger than the thickness of the paper drain 4, and the length is longer than the width of the paper drain 4.
It is located approximately at the center in the short side direction of 0.

Moreover, one end of each slit 2 is opened at the edge of the plate 10.

Then, insert the paper drain 4 into the driving casing 3, pull it out from the opening 31 of the tip 33 at the lower end of the casing 3, pass it through the slit 2 in the center of the tip member 1, fold it back, and fold the folded end into the adjacent through the slit 2 and into the opening 31 of the casing 3.

One end of each slit 2 is open at the edge of the board, so fold the paper drain back in advance.
Workability is good because it can be inserted into the slit 2 from the edge of the board.

The tip member 1 is placed against the opening surface of the casing 3, and in this state, the casing 3 is driven into the ground by a driving machine (not shown). Since the tip member 1 is in close contact with the opening edge of the casing 3 and the opening 31 is closed, mud will not enter and become clogged between the opening 31 and the paper drain 4.

Moreover, among the two slits 2, 2 of the tip member 1,
Since one strip is opened approximately at the center of the plate surface, even if the paper drain 4 is inserted through the slit 2 while hanging straight inside the casing, the center of the tip member 1 and the axis of the casing 3 will be approximately aligned. Accordingly, the tip member 1 does not come off the extended surface of the body surface of the casing 3, and the casing can be driven in smoothly.

After driving the casing 3 to a predetermined depth, when the casing 3 is pulled up, the tip member 1 remains in the soil due to the earth pressure applied to the tip member 1, and only the casing 3 rises. Further, the paper drain 4 is locked to the tip member 1 by friction with the tip member 1, and since earth pressure acts on the paper drain 4 itself, it does not stick to the casing 3 and rise together.

FIG. 4 shows another embodiment in which the longitudinal side edges of the plate 10 are extended obliquely upward to increase the resistance area against earth pressure.

FIG. 5 shows a tip member 1 having three slits 2 formed on the plate surface, into which a paper drain 4 is inserted in a meandering manner.

FIG. 6 shows another embodiment in which rod-shaped or plate-shaped anchors 6, 6 are attached to the large-sized tip member 1.

The anchor 6 is made of a metal with good springiness, and its base end is fixed to the distal end member 1 by welding or the like, and the anchor 6 is bent to be attracted to the electromagnet 7 buried in the wall surface of the casing 3.

After placing the casing, when the electromagnet 7 is de-energized when the casing is pulled out, the anchor 6 elastically returns.
When the anchors 6, 6 try to open, they act as resistance against the upward force on the tip member 1, and are more effective in preventing the paper drain from rising along with the tip member 1.

Incidentally, the anchor 6 is pivoted to the tip member 1 and is biased by a spring in a direction in which the tip faces sideways, and the upper end of the anchor is lifted against the spring and is attracted to an electromagnet as described above to demagnetize it when driving and pulling out. The anchor may be opened using a spring.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the tip member, Fig. 2 is a sectional view showing the attached state of the tip member, Fig. 3 is a sectional view when the casing is pulled out, Fig. 4 is a perspective view of another embodiment, and Fig. 5 , FIG. 6 is a sectional view of another embodiment, and FIG. 7 is a sectional view of another embodiment.
The figure is a cross-sectional view of the anchor in an open state, and FIG. 8 is a cross-sectional view of a conventional example. 1...Tip member, 2...Slit, 10...
Board.

Claims (1)

[Scope of utility model registration request] A hard plate 10 large enough to cover the opening 31 at the lower end of the paper drain driving casing.
In the paper drain tip member, a plurality of parallel slits 2 through which paper drains 4 can be inserted are opened, and the ends of each slit on the same side are opened at the edge of a plate 10.