JPH0540106Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to an anchor used for strip-shaped drain material that is driven into the ground to improve soft ground or prevent liquefaction of sandy ground during earthquakes.

(Prior Art) Paper drain method is generally used as a method for improving soft ground. In this construction method, a drain material made of a belt-shaped non-woven fabric is passed through a mandrel and press-fitted into the soft ground, and the drain material is left in the ground and the mandrel is pulled out to drive it into the ground. The ground is improved by draining the water inside. When placing this drain material, an anchor is used to leave the drain material in the ground. Conventional anchors are made of a plate bent into a hook shape, and this is used as a drain material with a metal wire. It was something that could be sewn on.

(Problem that the invention aims to solve) However, recently, a construction method using drain material has been developed to absorb the increase in soil pore water pressure during earthquakes in sandy ground, and this method uses a hollow structure with a large water flow rate. A cross-sectional strip-shaped drain material has been developed.

If conventional hook-shaped anchors made of plate materials were used when driving such hollow, large-section, belt-shaped drain materials, earth and sand would enter the hollow drainage channel from the end face of the belt-shaped drain material during driving, causing problems in the passage of water. There was a problem with the formation of areas where water could not be used.

In addition, the anchor must be attached to the drain material that is passed through the mandrel, and there is a problem in that the conventional sewing method cannot be used for the belt-shaped drain material with a large cross section.

In view of these conventional problems, the present invention is designed to close the opening at the end of the strip-shaped drain material with a large-diameter hollow cross section, thereby eliminating the intrusion of earth and sand, and furthermore, when the mandrel is pulled out, it strongly digs into the ground. The object of the present invention is to provide an anchor for a strip-shaped drain material that effectively prevents the strip-shaped drain material from coming off.

(Means for Solving the Problems) The gist of the present invention in order to solve such conventional problems and achieve the intended purpose is to have multiple passageways in the longitudinal direction and to a plate-shaped anchor plate that comes into contact with an end surface of a belt-shaped drain material that has a belt-shaped core material that has a water flow window that communicates with the water passageway, and covers the outer surface of the belt-shaped drain material with a filter cloth;
The anchor plate includes a plurality of locking protrusions that protrude from the surface of the anchor plate, are insertable into the water passageway, and integrally have a hook portion that is locked to the water flow window, and the anchor plate A belt-shaped anchor for drain material is characterized in that it is formed larger than the outer shape of the end face of a mandrel for driving drain material.

(Function) This belt-shaped drain material anchor is made by inserting the belt-shaped drain material into the mandrel and inserting the locking protrusion into the opening of the water passageway at the lower end of the mandrel, so that the hook part fits into the water passage window of the core material. and is stopped from falling out.
In this state, the anchor plate is pressed into the ground together with the mandrel, with the anchor plate in contact with the lower end surface of the mandrel. When the mandrel is pulled out, the anchor plate protrudes outward from the outer edge of the lower end surface of the mandrel, so it bites into the ground and becomes an anchor, and only the mandrel is pulled out with the strip of drain material remaining in the ground.

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

First, a strip-shaped drain material B using the anchor A according to the present invention will be explained with reference to FIGS. 5 to 8.

This strip-shaped drain material B has a substantially rectangular cross section, and includes a core material 1 whose opposing wide surfaces serve as water passing plates 1A, and a filter cloth made of a non-woven fabric covering the surface of the core material 1. It is composed of 2.

Core material 1 has a width W of 100 to 150 mm and a thickness of 10 to 15 mm.
It has a rectangular cross-sectional shape of about 100 yen, and the inside is partitioned by a plurality of ribs 1C that connect both water passage plates 1A at intervals in the width direction, so that the core material 1 is oriented in the longitudinal direction. A plurality of water passages 1B are formed.

The water passage plate 1A of the core material 1 has 5 holes facing in its width direction.
A large number of grooves 1D with a width of about mm are formed in the longitudinal direction of the core material at intervals of about 5 mm, and the grooves 1D
The bottom portion thereof communicates with each water passageway 1B to form a water passage window 1E. The grooves 1D are formed at alternate positions between the water passing plates 1A, 1A.
The core material 1 is made of a synthetic resin material such as vinyl chloride or polyethylene whose hardness and softness can be controlled by adjusting the composition.

Next, the anchor A used in the belt-shaped drain material B having a large-diameter hollow cross section as described above will be explained.

As shown in FIGS. 1 to 3, this anchor A consists of a single flat anchor plate 11.
and two types of locking protrusions 12 and 13 integrally protruding from one side of the anchor plate 11. Each of the locking protrusions 12 and 13 is provided in a protruding manner so as to simultaneously fit into the separate water passages 1B of the strip-shaped drain material B, and hook portions 12a and 13a are integrally formed on opposite surfaces of the distal ends of the protrusions 12 and 13. Molded. These hook portions 12a, 13a are opened from the inside of the water passage plates 1A, 1A of the strip-shaped drain material B, and the water passage windows 1E, which are arranged alternately, are opened therein.
1E and are prevented from coming off.

In addition, the anchor plate 11 is connected to a mandrel 14 for driving a strip-shaped drain material, as shown in FIG.
It is larger than the outer shape of the lower end surface.

As shown in FIG. 4, the anchor A constructed in this manner press-fits the respective locking protrusions 12 and 13 into the passageway 1B of the strip-shaped drain material B inserted through the mandrel 14. As a result, the hook portions 12a and 13a of each of the locking protrusions 12 and 13 engage with the water passage window 1E of the core material 1 and are prevented from coming off. With the anchor A attached to the strip-shaped drain material B in this manner, the anchor plate 11 is brought into contact with the lower end surface of the mandrel 14 and press-fitted together with the mandrel 14 into the ground. When the mandrel 14 is pulled out after press-fitting, the anchor plate 11 protrudes outward from the lower end of the mandrel 14, so it digs into the soil and prevents it from coming off, thereby allowing the strip-shaped drain material B to sink into the ground. Only the mandrel 14 remains and is pulled out, completing the driving of the strip-shaped drain material.

(Effect of the invention) The anchor for a strip-shaped drain material of the present invention is constructed as described above, and has a locking protrusion having a hook portion that is inserted into a passageway opened at the end face of the strip-shaped drain material and is latched to a water passage window. Since it is configured to protrude from the anchor plate, it can be easily attached to the strip-shaped drain material with one touch, and the water passage opening to the strip-shaped drain material can be closed by the anchor plate. This prevents dirt from entering during driving, and since the lower end opening of the mandrel is also closed by the anchor plate, dirt does not enter between the strips of drain material on the mandrel, and when pulling out the strip drain material. As a result, smooth driving is now possible.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention.
The figure is a plan view of the anchor, Figure 2 is a front view of the anchor, Figure 3 is a side view of the same, Figure 4 is a longitudinal sectional view of the anchor in use, and Figure 5 is a longitudinal sectional view of the anchor.
The figure is a plan view of the strip-shaped drain material with part of the filter cloth removed, FIG. 6 is a side view of the same, FIG. 7 is a vertical cross-sectional view of the strip-shaped drain material, and FIG.
FIG. A...Anchor, B...Band shape, 1B...Water channel, 1E...Water window, 11...Anchor plate, 12, 13...Locking protrusion, 12a, 13a...
...Hook part, 14...Mandrel.

Claims (1)

[Scope of utility model registration request] A plate-shaped plate that abuts the end face of a belt-shaped drain material, which has a plurality of water passages in the longitudinal direction and has a water passage window communicating with the water passages on the front and back sides, and the outer surface of the core material is covered with a filter cloth. an anchor plate; and a plurality of locking protrusions that project from the surface of the anchor plate, are insertable into the water passageway, and integrally have hooks that are locked to the water flow window, An anchor for a strip-shaped drain material, characterized in that the anchor plate is formed larger than the outer shape of the end surface of the mandrel for driving the strip-shaped drain material.