JPS6349016B2 - - Google Patents

Description

[Detailed Description of the Invention] All-welded wedge wire screens used in water wells, gas wells, oil wells, geothermal wells and underground water collection pipes are made of various metals such as steel or chloride which intersect with the framework. A wire is spirally wound around a round or irregularly shaped wire made of various resins such as vinyl resin, or a ring is fitted into the wire, and the contacts are fixed by welding or other methods.

Screens used for wells are installed at different depths depending on the depth of the well, so they are subject to different external pressures. Collapse Strength)
Therefore, screens used for relatively deep wells such as oil wells, geothermal wells, and gas wells, as well as those used for buried water collection pipes where the depth of burial and other pressure conditions increase. In some cases, a screen strong enough to withstand large external pressures is required, which sometimes requires the use of wires of significantly larger widths and heights.

However, the opening area of the screen
Naturally, increasing the wire width (area) is a big factor from the original purpose, so increasing the width of the wire (the part that is visible from the outside when it is wound) is important for water, oil, and other fluids to pass through. I am not impressed with this because it lowers the ratio (aperture ratio) between the area of the opening and the area outside the screen, which reduces the function of the screen. Furthermore, machines that make screens that can withstand large external pressures require large capacity and enormous power.

In addition, as usage conditions become more severe, the height of the wire to be wound needs to be greater than expected, and there are many cases where it is simply impossible to manufacture with a normal screen manufacturing machine with limited performance. Therefore, for these applications, the only option is to reinforce screens made by screen making machines with limited power. However, it is desirable that the reinforcing work can be easily performed.

The method of reinforcing the screen of the present invention is to wrap the wire in a shape that does not significantly reduce the slot size of the screen on top of the wire used in the screen to be reinforced. This is the way to do it. Specifically, (a) the rings are fixed to the outer surface of the wire at appropriate intervals, and (b) the reinforcing member is wound spirally with a pitch larger than the pitch of the wire and fixed to the wire. With these reinforcements, a strong external pressure resistant screen can be easily made.
Moreover, it is not only possible to simply wind it in a single layer, but also to wrap it in two or more layers if necessary. Furthermore, the optimal cross-sectional shape of the reinforcing member can be adopted in consideration of issues such as strength, usage, and manufacturing. Moreover, unlike reinforcement from the inside, this method does not have any obstructive structure inside the pipe section that serves as the fluid passage, so in the case of wells, maintenance work on pumps and wells can be carried out without any safety issues. In the case of a buried water collection pipe, this is ideal because it eliminates the serious defect of dirt and sand accumulating on reinforcing members inside the pipe, which deteriorates water collection efficiency. Furthermore, when comparing the costs of both wire screens with the same effective inner diameter, the wire screen according to the present invention is economical as it leads to a reduction in manufacturing costs.

The present invention fixes the contact portion between the wire and each pillar by winding the wire in a spiral or ring shape on the outside of a group of pillars arranged at appropriate intervals on the outline of a certain planar shape and perpendicular to this plane. In this method, a reinforcing member having a width equal to or larger than the width of this wire is wound around the outer surface of this wire at intervals larger than the wire spacing to fix the contact portion with the wire, and the material and cross section of the reinforcing member are The surface shape is characterized by being capable of resisting external pressure toward the center of the screen, and examples thereof will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram with some parts omitted of a wire screen according to the present invention. Reference numerals 1 denote pillars, which are arranged at predetermined intervals on the outline of a certain planar shape, for example, a circle, at right angles to this plane, and extend parallel to each other in the longitudinal direction of the pillars 1 to form a pillar group 2. 3 is this support group 2
The wire is wound spirally on the outside of the wire, and a water collection gap 4 is left between the wires. The contact portion between the wire 3 and the support 1 is fixed by welding or the like. The cross section of this wire 3 is generally V-shaped, but it may also be round, rectangular, or the like. The above structure is similar to a well-known wire screen.

In the present invention, a reinforcing member 5 having a width W equal to or larger than the width W of the wire 3 is provided on the outer surface of the wire 3 at a pitch P larger than the pitch P of the wire 3.
The contact portion between the wire 3 and this member 5 is fixed by welding, fitting, etc.

The material and cross-sectional shape of the reinforcing member 5 are selected so as to be able to resist external pressure toward the center of the screen. For example, it is made of steel or aluminum, and the cross-sectional shape is rectangular as shown in FIG.

This reinforcing member 5 is shown as being spirally wound in the case of FIGS. 1 to 3. Reinforcement member 5
The contact part between the wire 3 and the wire 3 can be fixed continuously, increasing efficiency.

FIG. 4 shows three examples in one drawing in which a ring-shaped reinforcing member 5 is fitted onto the outside of the wire 3 and the contact portion with the wire 3 is fixed by welding or the like. In the case where the width of the reinforcing member 5 is approximately equal to the width of the wire 3 plus half the width of the water collection gap 4, and in the case of a complete ring shape or a discontinuous ring shape cut in one plane, the left side of the figure If the parts are discontinuous, the end faces are brought together and integrated by welding or the like. In addition, if the ends are discontinuous and overlap each other, the overlapping parts are also fixed to each other, as shown in the center part of the figure. Further, when the width of the reinforcing member 5 is approximately equal to the width of the wire 3, as shown on the right side of the figure, a spacer 6 is interposed to stably fix the reinforcing member 5.

In addition, FIGS. 3 and 4 show the cut end surface of the fixed portion of the support 1 and the wire 3, and since it appears the same in the case of a spiral and the case of a ring, both cases are used for both cases.

The wire screen shown in the figure is usually buried underground for collecting water from wells, etc., and has a water collecting gap 4.
Collect underground water etc. through. Even if the wire 3 is buried deeply and subjected to large earth pressure, or pressure conditions such as vehicle running increase, the reinforcing member 5 is wound around the outer surface of the wire 3 and fixed at the joint between the two, so that the reinforcing member 5 is The material and the cross-sectional shape are such that they can resist external pressure in the direction of the center of the screen. In addition, when using the vertical type, the reinforcing member 5 does not get in the way when the pump or water pump is inserted into the screen or taken out to the outside, and the external reinforcing member 5 does not cause any negative effects in terms of the effective inner diameter against flowing water. Must not be. Furthermore, even in the case of the horizontal type, sand and mud will not accumulate on the reinforcing member and reduce the water collection efficiency, unlike in the internally reinforced type.

According to the present invention, a reinforcing member having a width equal to or larger than the width of the wire is wound around the outer surface of the wire constituting the screen at intervals larger than the interval between the wires, and the contact portion with the wire is fixed. In addition, the reinforcing member can be fixed to extremely narrow wires very easily, and the material and cross-sectional shape of the reinforcing member are such that it can resist external pressure toward the center of the screen. It has the feature of being able to reinforce the screen, and also solving problems such as difficulty in maintenance and reduced water collection efficiency, such as those placed inside the screen.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing a specific example of the wire screen according to the present invention, and Fig. 2 is the same A-A.
A line sectional view, FIG. 3 is a detailed sectional view of the main part, and FIG. 4 is a schematic sectional view showing three aspects of the ring-shaped reinforcing member in the same drawing. 1... Strut, 2... Strut group, 3... Wire,
4... Gap, 5... Reinforcing member, 6... Spacer.

Claims (1)

[Scope of Claims] 1. A wire is wound spirally or in a ring shape on the outside of a group of pillars arranged at appropriate intervals on the outline of a certain planar shape at right angles to this plane, so that the wire contacts each pillar. In this method, a reinforcing member with a width equal to or larger than the width of the wire is wound around the outer surface of the wire at intervals larger than the wire spacing to fix the part in contact with the wire, and the reinforcing member is A wire screen characterized in that the material and cross-sectional shape are such that it can resist external pressure toward the center of the screen. 2. The wire screen according to claim 1, wherein the reinforcing member is ring-shaped and arranged on a plane perpendicular to the support pillars. 3. The wire screen according to claim 2, wherein the ring shape is formed by fixing each end of an open ring directly or overlappingly through a spacer.