JPS59141619A - Filter for water draining pipe and its use - Google Patents

Abstract

PURPOSE:To make easier the taking out of a filter by a method in which a large number of vertical parts of sufficiently smaller strength than a cross part are provided almost in orthogonal direction to the cross part of a spiral form to form a meshed filter, and the meshed filter is used as the water draining pipe. CONSTITUTION:A large number of vertical parts 1 are set in parallel with the axial direction of a cylindrical filter 3, and a continuous cross part 2 is spirally and almost orthogonally attached to the periphery of the vertical parts 1 to form a meshed filter 3 with integrated cross portions. The vertical parts 1 are sufficiently weaker in strength than the cross part 2. In exchanging the filter, the tail end of the cross part 2 is pulled out to the outside of the water drawing pipe 4, whereupon the vertical parts 1 are gradually broken because of their weaker strength, and the cross part 2 is taken out while being stretched into smaller diameters and the pulling force is orderly transmitted to the back side of the pipe 4. The filter 3 can thus be drawn out without discontinuation, and the exchange of the filter 3 can be easily made.

Description

[Detailed description of the invention] and its exchange method.

It has been proven through past experiments, implementation, and theoretical analysis that water drainage is very effective for preventing ground failure or slope failure.

By the way, as shown in Figure 6%I, the drain pipe buried underground has a hole (b) sized at the tip of the pipe (,) to prevent the inflow of soil particles and allow only water to flow in. It has a structure that The portion where this drain hole group (b) is located is referred to as a filter portion (C).

As described above, there are generally four types of drain pipe structures. That is, there are slit type, perforated type, mesh type, and water-permeable cloth type, but even if the filter part (c) is constructed using any of these methods, the following problems still exist. .

In other words, due to the structure of the filter or its construction method, water can be removed very effectively in the short term, but in the long term, #'i
'The pores (b) of part (C) of the filter become clogged and the water permeability is lost, so that the effect cannot be expected in many cases.

In this case, pull out the water drainer from the polling hole,
It may be possible to replace the drain hole, but when clogging occurs, the drain hole has already been compressed by earth pressure and clayey soil and fine sand have entered the hole (2), so the conventional structure The water cannot be pulled out from the polling hole with the water drainer.
In reality, it is almost impossible to replace the drain pipe.

Further investigation into the reason revealed the following.

That is, when the drain pipe is forcefully pulled out from the polling hole, there is almost no reduction in the cross section of the drain pipe when the knob is pulled out, so there is almost no separation from the inner surface of the polling hole. Therefore, the filter must be pulled out with clay or sand attached to its entire length.
That will happen.

Therefore, if an attempt is made to forcibly pull it out with a large tensile force, ignoring the resistance, the drain pipe will be cut in the middle and a large amount of drain pipe will remain at the n-1 depth.

It is almost impossible to remove the drain pipe left behind in this way.

In addition, it is impossible to pull out the drain pipe, which is directly buried in the ground, and in this case, the idea of replacing the pipe is generally not considered from the beginning.

By the way, the effect of draining water from the ground has an indirect effect compared to the effect of pile work and ground anchor work, which directly compress the sliding load of the ground.

Despite this, the drainage effect is generally not directly incorporated into design calculations.

The reason for this is, as mentioned earlier, that clogging of the filter hole Φ) is unavoidable and subsequent replacement is nearly impossible. This is because it is not possible.

Therefore, nine experiments and studies have been carried out to develop a relatively long filter that can be easily replaced, but it has not yet been completed or succeeded.

The present invention has been made to improve these points.It is an object of the present invention to provide a structure of a filter in a drain pipe and a method for using the same, which can be easily pulled out and replaced even after long-term use. purpose.

Next, the configuration of the embodiment will be explained.

<A> Vertical member A large number of vertical members (1) parallel to the axial direction of the cylindrical filter
Place.

The material strength of the vertical member (1) is made to be sufficiently smaller than that of the cross member (2), which will be described later.

<Opening> A helical cross member (2
).

The cross member (2) is made of a continuous wire wound in a spiral shape, and has sufficiently greater strength than the vertical member (1).

〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〉 .

For convenience of explanation, the above description is based on the vertical member (1) and the transverse member (2).
) K has been explained separately, but in terms of manufacturing, it is common to mold the two parts as one piece without separating them, and integral molding is also possible in terms of plastic molding technology.

(g) Other shapes - It is also possible to adopt a shape in which the group of vertical members (1) is positioned outside the spiral cross member (2) and the intersection parts are integrated.

Next, we will explain how to replace the filter.

The filter (3) is housed in a perforated water drain pipe (4) and becomes clogged after long-term use.

Then, grasp the tail end of the helical cross member (2) outside the e-beam and pull it out.

Then, since the vertical member (1) is made of a material with low strength or the bonding force between the two members is weak, the transverse member (2) will sequentially break or the two members will separate and break. While the fragments remain attached to the cross member (2) K, or in a state where they are separated, the cross member (2) is stretched while gradually decreasing its diameter.

Therefore, unlike when pulling out the entire filter at once, the pulling force is not lost due to frictional resistance with the inner surface of the pipe (4), and since there is always only one place that resists, it is A tensile force is transmitted in the direction.

In this state, the vertical member (1) and the filter (
3) can be completely removed from inside the 6-ib (4) by removing the water.

Next, an example of experimental construction will be explained.

A filter with a length of 8 m was manufactured by using a vertical member (1) with a diameter of 0.5 was and a cross member (2) of polyethylene with a diameter of 2.5 mm. This length of 8trL is far longer than conventional filters.

Then, when the tail end of the cross member (2) was pulled, the tensile force did not increase at all even if the rupture point progressed to the back, but the vertical member (1) was continuously broken and the entire length was pulled out from inside the pipe. I was able to do that.

This cross member (2) has sufficient strength.
There was no worry about it breaking itself.

Then, clean the clay that has adhered to the inside of the drain pipe (4) with a special brush and air jet water, and use a new filter (3).
) for up to $! Water intake measurements confirmed that the drainage function had been restored.

According to the present invention, as described above, a clogged filter can be completely removed from a pipe without increasing the resistance to pull it out.

Therefore, since drainage is semi-permanently interrupted, drainage works can be incorporated into the design as an effective element to prevent ground damage.

[Brief explanation of the drawing]

Figure 1: Layout of the vertical member, Figure 2: Shape diagram of the cross member, Figure 3: Side view of the filter, Figure 4: Cross-sectional view of the filter, Figure 5: Explanatory diagram of the cross member being pulled out. , Figures 6 and 7:
An explanatory diagram of the usage state of a conventional drainage pipe, 1: Vertical member, 2: Transverse member, 3: Filter

Claims (1)

[Scope of Claims] 1 A mesh is formed by a plurality of longitudinal members and a transverse member arranged in a direction substantially perpendicular to the longitudinal member, which is created by forming a single wire rod into a spiral shape, A water drain pipe filter 2 is configured such that a transverse member shaped like a shape can be pulled out independently from a vertical member, a plurality of vertical members, and a wire rod formed into a spiral shape so that it can be drawn out independently from the vertical member. When removing a filter made up of transverse members arranged in orthogonal directions from inside a pipe, by applying tensile force to the transverse members, the tensile force is applied to the end direction while sequentially breaking the continuity of the longitudinal members. How to use the drain pipe filter by transmitting information