JP3392209B2 - Ground compaction tools - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention expands the hole by inserting a flexible bag into a small hole formed in the ground and injecting a pressure fluid into the bag to inflate it. The present invention relates to the bag body as a compaction tool of the ground, which is used in a method of calibrating the ground and compacting the ground around the hole.

[0002]

2. Description of the Related Art A method for compacting the above-mentioned ground is disclosed in JP-A-64
No. 24,913, and as the bag used here, a stretchable one in which a bag made of synthetic rubber is combined with a reinforcing net body of nylon or aramid fiber is shown.

Further, Japanese Patent Laid-Open No. 2-209516 discloses that
The bag used in the above method is a bag formed by laminating or impregnating rubber on a cloth woven with a covering thread in which a non-stretchable thread is wound around a stretchable thread such as polyurethane fiber or rubber. It is described in the above.

[0004]

However, it is recognized that each of the bags has a simple tubular shape, and both ends of the bag are squeezed to be attached to the shaft, so that wrinkles inevitably occur at the attachment portion. Thus, when the pressure fluid is inserted into the inside and inflated, the fabric structure is distorted in the periphery of the attachment portion and easily breaks.

Further, in recent years, a tubular woven fabric is formed by a warp yarn arranged in an annular shape and a weft yarn woven in a spiral manner with respect to the warp yarn, and the diameter of the tubular woven fabric is changed in the longitudinal direction. Different diameter tubular fabrics are known.

By using this structure of the tubular fabric of different diameters, a small diameter portion is formed at both ends and a large diameter portion is formed at the central portion so that the small diameter portion is fixed to the shaft and
It is possible to expand the diameter of the ground hole in the large diameter portion.

However, in such a different-diameter tubular fabric, since the number of warp yarns is constant over the entire length,
The warp yarns are extremely mixed in the small diameter portion, and the pitch of the weft yarns woven therein tends to become narrow, and the intervals of the warp yarns become small in the large diameter portion.

Therefore, when the diameter of the different-diameter tubular fabric changes greatly, the density of the weft yarn or warp yarn becomes coarse in at least one of the large-diameter portion and the small-diameter portion, and misalignment easily occurs.

Therefore, when the tubular fabric having different diameters is expanded, a portion where the texture is opened is generated somewhere, and the rubber is excessively stretched at that portion, and it bulges outward or bursts. Sometimes.

Even when the rubber tube is inserted inside the different-diameter tubular fabric without integrating the different-diameter tubular fabric and the rubber, the rubber tube has a different diameter of the different-diameter tubular fabric. The rough part may be pushed open and may bulge and burst from it.

The present invention has been made in view of the above circumstances, and even if the different-diameter tubular fabric has a partially coarse portion, the rubber tube does not bulge or burst from there. An object of the present invention is to provide a bag body as a compacting tool that can surely compact the ground.

[0012]

The compaction tool for ground according to the present invention is a tubular fabric of different diameters having a small diameter at both ends and a large diameter portion at the central portion, the diameter of which varies in the longitudinal direction. A diameter-expandable airtight tube inserted in the different-diameter tubular fabric, and a thin and non-extensible sheet material interposed between the airtight tube and the different-diameter tubular fabric It is characterized in that

In the present invention, it is appropriate to use a thin cloth or a thin plastic sheet as the sheet material.

As the sheet material, a sheet-like material having a width equal to or larger than the inner peripheral length of the large diameter portion of the different-diameter tubular fabric is rolled into a tubular shape and different from the airtight tube. It may be fitted between the tubular textile and the tubular textile.

The sheet material has a tubular shape having a diameter equal to or larger than the inner diameter of the large-diameter portion of the different-diameter tubular woven fabric, which is used as the airtight tube and the different-diameter tubular woven fabric. It may be fitted between the two.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a compaction tool 1 for ground according to the present invention, in which 2 is a different-diameter tubular fabric, and 3 is an airtightness inserted in the different-diameter tubular fabric 2. A tube, 4
Is a sheet material interposed between the airtight tube 3 and the tubular fabric 2 having a different diameter.

The different-diameter tubular fabric 2 comprises a warp yarn 5 arranged in an annular shape and extending in the length direction of the different-diameter tubular fabric 2, and a weft yarn 6 helically woven into the warp yarn 5. It is a tubular fabric.

In the different-diameter tubular fabric 2, the diameter of the tubular fabric continuously changes in the lengthwise direction, a large diameter portion is formed in the central portion 7, and both end portions 8 thereof are formed. The diameter is reduced to form a small diameter portion.

As warp yarns 5 and weft yarns 6 constituting the different-diameter tubular fabric 2, it is preferable to use fibers having high strength and low elongation such as polyester fibers, nylon fibers, and aramid fibers.

Since the internal pressure acts on the tubular fabric 2 having different diameters to swell during use, the yarn must have sufficient strength.
Further, in order to secure the dimensional stability of the holes and prevent the texture from opening more than necessary when it is expanded to open the holes in the ground, yarns that excessively extend when pulled are not preferable.

In this embodiment, a large-diameter portion is formed over the central portion 7 of the tubular fabric 2 of different diameter, and a small-diameter portion is formed only at both ends 8 of the tubular textile fabric 2. The diameter of the portion 7 may be further changed to a larger or smaller diameter so that the large diameter portion and the small diameter portion are alternately formed.

The airtight tube 3 is made of a thin and flexible material having airtightness. For example, a tube of natural or synthetic rubber or a tubular film of polyethylene or soft polyvinyl chloride resin can be used.

When a stretchable material such as a rubber tube is used as the airtight tube 3, it is preferable that the airtight tube 3 is sufficiently smaller than the inner diameter of the tubular fabric 2 having a different diameter. , When using a material that does not have elasticity such as a plastic tubular film,
One having a diameter approximately equal to the inner diameter of the large diameter portion of the different-diameter tubular fabric 2 should be used.

As the sheet material 4, a thin and woven cloth such as a woven cloth or a nonwoven cloth, or a thin and non-stretchable plastic sheet can be used.

When a cloth is used as the sheet material 4, the cloth does not need high strength,
Threads that are sufficiently thinner than the warp yarns 5 and the weft yarns 6 that constitute the different-diameter tubular fabric 2 should be used, and should be sufficiently meshed than the different-diameter tubular fabric 2.

The sheet material 4 may be a tubular material having a diameter substantially equal to or larger than the inner diameter of the large diameter portion of the different-diameter tubular fabric 2. In this case, a tubular woven or molded product may be used, or a tubular woven or molded product may be sewn or bonded to form a tubular product. .

In addition, a sheet-shaped material having a width substantially equal to or larger than the inner circumferential length of the large diameter portion of the large diameter portion of the different-diameter tubular fabric 2 is rolled into a tubular shape at both ends. It can also be used without joining.

Thus, the airtight tube 3 is a tubular fabric 2 having a different diameter.
The sheet material 4 is inserted in the inside, and the sheet material 4 is interposed between the different-diameter tubular fabric 2 and the airtight tube 3, and both ends of the different-diameter tubular fabric 2 and the airtight tube 3 are attached to the shaft 9. It is fitted and fixed to the outside of the ring body 10.

Both ends of the sheet material 4 may be fixed to the ring body 10 together with the different-diameter tubular fabric 2 and the airtight tube 3, but they may not be fixed as shown in FIG.

In FIG. 1, 11 is an upper ring body 10.
Is a pressure fluid press-fitting pipe that penetrates through, and a pressure fluid such as compressed air is press-fitted into the airtight tube 3 via the pressure fluid press-fitting pipe 11.

[0031]

Next, a method for compacting soft ground using the compacting tool 1 of the present invention will be described. First, a small-diameter hole is made in the ground from the ground surface. As a method of drilling holes,
A ground drill or a water jet can be used.

The diameter of the hole to be bored is sufficient if the small-diameter portion of the different-diameter tubular fabric 2 in the compaction tool 1 can pass therethrough, but the strength, density, degree of weakness of the ground, etc. The required diameter is set according to the conditions. Further, the depth of the holes is set so that the entire length of the tubular fabric of different diameter 2 can be entered, but the holes can be formed deeper if necessary.

Next, the compacting tool 1 of the present invention is inserted into the bored hole. At this time, the inside of the airtight tube 3 in the compaction tool 1 is not pressurized, the airtight tube 3 is in a shrunk state, and the different-diameter tubular fabric 2 also has wrinkles in the large diameter portion as appropriate. , The size is reduced to the extent that it can enter the hole.

After the compaction tool 1 is inserted into the hole to the required depth, the pressure fluid injection pipe 11 to the airtight tube 3 are inserted.
A pressurized fluid such as pressurized water or compressed air is fed into the inside to inflate the airtight tube 3.

At this time, the airtight tube 3 expands to push and expand the sheet material 4, and further the sheet material 4
Pushes and expands the different-diameter tubular fabric 2 to expand the different-diameter tubular fabric 2.

When the tubular fabric 2 of different diameter is expanded, its surface presses the inner surface of the hole to expand the hole. As a result, the diameter of the hole is enlarged, and moisture is squeezed out from the ground around the hole to compact the ground.

At this time, in the present invention, since the diameter of the different-diameter tubular fabric 2 changes in the length direction thereof, the texture is locally opened as described above, and the extremely coarse portion is Can occur.

However, in the present invention, the sheet material 4 is in contact with the inner surface of the different-diameter tubular fabric 2, and the sheet material 4 does not have extensibility. It does not excessively bite between open weaves supported by yarns. Since the sheet material 4 supports the inner airtight tube 3, the inner airtight tube 3 does not swell or burst from the texture of the tubular fabric 2 having a different diameter.

Even if a large pressure acts on the airtight tube 3, since the pressure is supported by the tubular fabric 2 having a different diameter, an excessive load does not act on the airtight tube 3 and the sheet material 4. .

[0040]

Therefore, according to the present invention, the tubular fabric with different diameters 2
Even in a state in which a coarse part is locally generated in the yarn and the yarns are spaced apart to open the weave, the airtight tube 3 or the sheet material 4 swells or bursts between the open weaves. There is nothing to do.

The fluid pressure in the airtight tube 3 is borne by the tubular cloth 2 having a large diameter and having a large strength, and the airtight tube 3 and the sheet material 4 are not excessively loaded, so that they are stably high. Fluid pressure can be applied.

Therefore, a high-pressure pressure fluid is fed into the airtight tube 3 to strongly expand the different-diameter tubular fabric 2 to push the inside of the hole with a high fluid pressure, and the ground is strong. Can be compacted to.

Further, according to the present invention, since the different-diameter tubular fabric 2, the airtight tube 3 and the sheet member 4 are separated, the individual different-diameter tubular fabric 2, the airtight tube 3 and the sheet member 4 are individually provided. Each of them is more flexible than the one in which they are integrated, does not feel stiff, and can be folded small.

Therefore, it becomes possible to insert it into a hole having a smaller diameter, and by expanding it to a larger diameter, it becomes possible to press the ground more strongly and compact it strongly.

[Brief description of drawings]

FIG. 1 is a half-cut front view showing an embodiment of the present invention.

[Explanation of symbols]

1 Compaction tool 2 Different diameter tubular fabric 3 Airtight tube 4 sheet materials 7 Central part 8 end

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-52-139213 (JP, A) JP-A-60-261827 (JP, A) JP-A 64-24913 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E02D 3/02 103 E02D 3/10 E02D 3/12

Claims (5)

(57) [Claims] 1. A different-diameter tubular woven fabric (2) having a small diameter at both ends (8) and a large-diameter portion at a central portion (7), the diameter of which varies in the longitudinal direction, and the different-diameter tubular shape. An airtight tube (3) inserted through the woven fabric (2), and a thin non-stretchable sheet interposed between the airtight tube (3) and the tubular fabric of different diameter (2) A compaction tool for the ground, characterized by comprising a material (4) 2. The ground compactor according to claim 1, wherein the sheet material (4) is made of a thin cloth. 3. Ground compactor according to claim 1, characterized in that the sheet material (4) is a thin plastic sheet. 4. The sheet material (4) has a width equal to or larger than the inner peripheral length of the large diameter part of the tubular fabric (2) with different diameters, and is rolled into a tubular shape. 4. The ground compactor according to claim 1, wherein the airtight tube (3) is fitted between the airtight tube (3) and the tubular fabric (2) having a different diameter. 5. The airtight tube (3), wherein the sheet material (4) has a cylindrical shape having a diameter equal to or larger than the inner diameter of the large diameter portion of the different-diameter tubular fabric (2). ) And a tubular fabric of different diameter (2) are fitted between the ground compaction device and the woven fabric (2).