JPH0455080Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a tip tool for driving drain material.

(Prior Art) Generally, consolidation dewatering of soft ground is carried out by driving a paper drain made of a strip of paper or a chemical drain made of chemical fiber into the soft ground.

Such drain material is driven using a well-known pouring machine, but in this case, in order to leave the drain material in the ground, conventionally, as shown in Fig. 3 or 4, The central parts d and d' of the plastic boat-shaped cross-section tip members c and c' are fixed to the lower end of the drain material b inserted into the hollow mandrel a of the casting machine with staples e, and then the drain material b is is driven into the ground together with a hollow mandrel a, and when a predetermined driving depth is reached, only the hollow mandrel a is pulled up to the ground, leaving the drain material b in the ground. In this way, the tip member c attached to the lower end of the drain material b,
c' is fixed in the ground, and even when the hollow mandrel a is pulled out, the drain material b does not go up together, and the drain material b can be left in the ground.

However, if the surface layer of soft ground is filled with hard soil or if obstacles such as concrete pieces are mixed in, the plastic tip members c and c' will be damaged when the drain material b is placed. As a result, when drain material b is driven and only the hollow mandrel a is pulled up to the ground, there is a problem that the drain material b is not fixed in the ground and is pulled out to the ground as the mandrel a is pulled up. be.

For this reason, conventionally, in such cases, a process such as drilling a hole in advance using an auger excavator at the point where the drain material b will be inserted is required, resulting in relatively high construction costs and the construction period. There was a problem that took a long time compared to the situation.

Therefore, in order to solve such a problem, as described in Japanese Utility Model Application Publication No. 60-62543, a tip member main body with a boat-shaped cross section connected to the lower end of the drain material, and a tip member on the bottom of the tip member U that engages the bottom surface
A tip member for drain casting has been proposed that includes a clip-type protective metal fitting in the shape of a letter.

(Problems to be Solved by the Invention) However, in the tip member as described above, in addition to the tip member body made of plastic, an expensive clip-type protective fitting that requires punching and bending and requires many processing steps is used. Therefore, the cost is high, and if the tip member body is thick, it is difficult to attach the protective metal fitting, and if the tip member is thin, the fixing function decreases and the protective metal fitting falls off during driving. be.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a tip tool for driving a drain material that is inexpensive and has good wearability.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a first member comprising a flat lower plate portion and a drain material holding portion protruding upward in the central portion of the lower plate portion. and a reinforcing second member having a through hole in the center thereof, which is approximately the same size as the lower plate portion of the first member, and through which the drain material holding portion is inserted.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a drain material driving tip 1 is attached to the lower end of a drain material A inserted into a hollow mandrel (not shown) of a driving machine, and is a rectangular lower plate. 2 and a drain material holding portion 3 projecting upward at the central portion thereof, and a drain material holding portion 3 having a flat plate shape and having approximately the same size as the lower plate portion 2 of the first member 4. A second reinforcing member 6 (see FIG. 2) has a rectangular through-hole 5 in the center thereof through which the second reinforcing member 6 is inserted.

The first member 4 is integrally molded from plastic such as polyethylene, and the drain material holding section 3 consists of a pair of holding plates 3a, each of which is inserted into the through hole 5. It is tapered for ease of use. Further, the second member 6 is made of a metal plate such as a steel plate, and the through hole 5 in the hollow portion thereof is formed by punching or the like.

When the tip tool 1 is attached to the lower end of the drain material A, the lower end of the drain material A is inserted into the through hole 5 of the second member 6 as shown in FIG. (not shown) etc.
The drain material holding portion 3 of the member 4 is fitted, and the lower surface of the second member 6 is in contact with the upper surface of the lower plate portion 2 of the first member 4.

To drive the drain material A into soft ground using the tip tool 1, first attach the drain material A to a drain material construction machine (for example, TD model driving machine) equipped with a driving device, and then The tip tool 1 is attached to the lower end of the drain material A that protrudes further. That is, the lower end of the drain material A is inserted into the through hole 5 of the second member 6 from above, the lower end of the drain material A is held in the drain material holding part 3 of the first member 4, and then the drain material A While holding the drain material A between the holding plates 3a, 3a, fit the drain material holding part 3 into the through hole 5 of the second member 6 from below.
As is well known, the lower end of the drain material holding part 3 is
Connect and secure with staples, etc.

Thereby, the tip tool 1 is attached to the lower end of the drain material A, and the second member 6 is located between the lower end of the hollow mandrel and the lower plate portion 2 of the first member 4.

Then, the drain material A with the tip tool 1 attached together with the hollow mandrel is driven into the ground at a predetermined driving point. At this time, the first member 4 is
Although the lower surface receives driving pressure, damage and deformation of the lower plate portion 2 of the first member 4 is prevented because it is reinforced and supported by the second member 6 backed up at the lower end of the hollow mandrel.

When the drain material A reaches a predetermined depth, the hollow mandrel is pulled up by reversing the driving device. At this time, the second
The upper surface of the member 6 receives ground pressure and comes into close contact with the lower plate portion 2 of the first member 4, and the tip tool 1 works together as an anchor, leaving the drain material A in the ground and only the hollow mandrel being pulled out. It can be done.

When the hollow mandrel is pulled up to the ground, the drain material A is cut, driving is completed, and the mandrel is moved to the next driving point.

In addition, in the above embodiment, the damage to the lower plate portion 2 of the first member 4 during driving of the drain material A is thought to be greater than that described in Japanese Utility Model Application Publication No. 60-62543. It has been confirmed by using only the first member 4 that this is mainly damage to the periphery of the lower plate portion 2 and does not damage the anchor function. Furthermore, even if the lower plate portion 2 is damaged and a portion of the second member 6 is exposed, there is no functional problem.

(Effects of the invention) Since the present invention is configured as described above, it can be easily attached to the lower end of the drain material, and the second reinforcing member has an extremely simple structure and can be manufactured only by punching. It is inexpensive because there is little material loss. In addition, the first member and the second member function as an anchor in the ground, reliably preventing the drain material and the hollow mandrel from rising together.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a perspective view of a tip for driving a drain material, FIG. 2 is a perspective view of a second member, and FIGS. 3 and 4. is a sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1... Tip tool, 2... Lower plate part, 3... Drain material holding part, 4... First member, 5... Through hole, 6
...Second member.

Claims (1)

[Scope of utility model registration request] The first member is attached to the lower end of a drain material inserted through a hollow mandrel, and includes a flat lower plate portion and a drain material holding portion protruding upward at the center of the lower plate portion; A tip for driving a drain material, characterized in that it is constituted by a lower plate part of one member and a second reinforcing member having a through hole in the center part having approximately the same size and through which the drain material holding part is inserted. Ingredients.