JP2533721Y2 - Joint structure of belt-shaped drain material - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a joint structure of a ground improvement belt-shaped drain material for improving soft ground.

(B) Conventional technology Conventionally, a belt-shaped drain material used as a soil improvement method for consolidating soft ground having a high moisture content in a landfill site or as a countermeasure against liquefaction of a sand ground during an earthquake is disclosed in JP-A-1-97715.
Japanese Patent Application Laid-Open Publication No. HEI 7-202, “a ground drain strip material” is known. This type of band-shaped drain material generally has a width of 100 to 150 m.
m, made of a synthetic resin hollow thin plate with a thickness of about 10 to 15 mm, inside which rectangular water passages are arranged, and a slit-shaped opening communicating with the water passage on the front and back surfaces Are provided. The outer surface of the belt-shaped drain material is covered with a nonwoven fabric having high water permeability. The belt-shaped drain material is elongated by being connected in a predetermined length unit, and after being wound in a roll shape, is conveyed to the site, and is continuously cast vertically or horizontally on soft ground. .

(C) Problems to be solved by the invention When connecting the above-mentioned belt-shaped drain material, conventionally, a PP band or a stapler was used. When connecting using a PP band, as shown in FIG. 4, the ends of two band-shaped drain materials 50 and 51 are first butted, and then a belt 52 made of synthetic resin is inserted into the opening 53 of each band-shaped drain material. The two belt-shaped drain members 50 and 51 must be connected by forming a loop, further pulling both ends of the belt 52, and binding the belt 52 in a state where the loop is reduced, and the belt 52 is connected in the width direction of the belt-shaped drain member. It was necessary to attach at least three places to the camera. Further, in order to reinforce the connection portion and reduce friction with mud during casting, it was necessary to wind a transparent polyethylene sheet or the like around the connection portion F in a belt shape. Therefore, in the conventional joint structure of the band-shaped drain material, it takes time to connect the band-shaped drain material, the method of connection is complicated, and the strength of the connecting portion is low due to the low tensile strength of the PP band. was there. Also, when connecting using a stapler,
There is a problem that a special device for stapling is required, workability is poor, and strength of a connection portion is low.

The present invention has been made in consideration of the above circumstances, and provides a joint structure of a belt-shaped drain material that can easily and reliably connect the belt-shaped drain material.

(D) Means for Solving the Problems This invention is a hollow thin plate structure having a tubular member having openings at both ends, and a thin plate structure having a cross section slightly smaller than the opening, and is press-fitted from each opening to face each other. The belt-shaped drain member is provided with a number of slit-shaped holes on its outer wall, and the tubular member has a band-shaped drain in a press-fitting direction. A joint for the band-shaped drain material, wherein a locking piece for fixing the band-shaped drain material by locking the band-shaped drain material in the reverse direction by press-fitting the material is provided on the inner wall. Structure.

The band-shaped drain material used in the present invention is basically rectangular in cross section, and the rectangular cross section is partitioned by a plurality of ribs. Along the slit-shaped holes, ie, water passage holes, are provided at predetermined intervals in the longitudinal direction of the belt-shaped drain material,
A water hole on the upper water passage surface and a water passage hole on the lower water passage surface are arranged in a "chord" so as not to penetrate. The material of the belt-shaped drain material is a synthetic resin such as vinyl chloride or polyethylene whose hardness can be controlled by mixing.

(E) Operation According to the present invention, when one band-shaped drain material is press-fitted from one opening of the cylindrical member and another band-shaped drain material is press-fitted from the other opening of the cylindrical member, the two band-shaped materials are inserted into the cylindrical member. The drain material is stored, and the locking piece provided on the inner wall of the tubular member further engages with the slit-shaped hole provided on the outer wall of the belt-shaped drain material to fix the tubular member and the belt-shaped drain material, As a result, the two belt-shaped drain members are connected.

(F) Embodiment The present invention will be described in detail below with reference to the embodiment shown in FIGS. This invention is not limited by this.

1 is a perspective view showing an appearance of a band-shaped drain material joint structure according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the band-shaped drain material joint structure, and FIG. 3 is a perspective view of the joint. It is. Note that a filter coated on the outer surface of the belt-shaped drain material is omitted.

Reference numeral 10 denotes a metal tubular member (hereinafter, referred to as a connection fitting) having a hollow thin plate structure and having openings 11 at both ends;
Is a thin plate structure having a cross section slightly smaller than the opening 11 of the connection fitting 10. The first belt-shaped drain material and the second belt-shaped drain material, which are fixed in the connection fitting 10 by being press-fitted from each opening 11 so as to face each other. It is a belt-shaped drain material.

As shown in FIG. 2, on the right inner wall of the connection fitting 10, the movement of the first band-shaped drain material 20 is free in the press-fitting direction A, and the first band-shaped drainage material is moved in the direction opposite to the press-fitting direction A. Locking pieces 12 for locking the material 20 to prevent withdrawal are disposed vertically, and a second belt-shaped drain material is provided on the left inner wall in the press-fit direction B.
30 in the direction opposite to the press-fitting direction B.
Locking pieces 13 for locking the strip-shaped drain material 30 and preventing the removal are provided vertically. The locking pieces 12 and 13 are formed by cutting out the surface of the connection fitting 10 into a ∧ shape and bending the ∧ portion about 30 ° toward the inside of the connection fitting. Locking piece 1
In portions 2 and 13, the ∧ portions are cut out so as to face each other with the center of the connection fitting 10 as a boundary. When the width of the band-shaped drain material is 150 mm, the arrangement pitch of the locking pieces 12 and 13 is set to six places in the width direction and four places in the press-fit directions A and B. The arrangement pitch is preferably set in accordance with the width of the belt-shaped drain material and the shape of the surface holes.
The locking pieces 12 and 13 are arranged vertically so that they can be securely locked with slit-shaped holes (described later) of the band-shaped drain material.
It is provided in a state shifted by about 5 mm. The connection fitting 10 is
It is preferable to use a zinc-plated iron plate, but it is also possible to use a steel plate, a stainless steel plate, or a synthetic resin that has been subjected to another corrosion prevention treatment.

The first belt-shaped drain member 20 has a large number of slit-shaped holes (hereinafter referred to as water passage holes) 21 which can be engaged with the locking pieces 12 on a water passage plate surface (outer wall) 22. Similarly, the second belt-shaped drain material 30 is provided with a large number of water passage holes 31 which are slit-shaped holes.

In such a configuration, when the first belt-shaped drain material 20 is press-fitted from the right opening 11 of the connection fitting 10, the water-passing plate surface 22
Is guided into the connection fitting 10 over the locking piece 12. Then, in a state where the first belt-shaped drain material 20 is press-fitted to substantially the center of the connection fitting 10, the second belt-shaped drain material 30 is then inserted into the connection fitting 10.
Pressing in from the left opening 11 of the
It is guided by the connection fitting 10 over the 13 and is stopped by abutting on the end of the first belt-shaped drain material 20 which has been press-fitted earlier. In this state, movement of both band-shaped drain members 20 and 30 in the fittings 10 is also prevented in the press-fit directions A and B, and the ends of the respective band-shaped drain members 20 and 30 are fixed in the cylindrical fitting 10. Therefore, the two belt-shaped drain members 20, 30 are connected. 23 is a water passage, and 24 is a rib. The connection of the band-shaped drain material using the connection fitting 10 described above may be performed in a factory in advance, or may be performed locally.

(G) Effect of the Invention According to the belt-shaped drain material joint structure of the present invention, two belt-shaped drain materials can be easily connected at any place,
In addition, since the connection strength is high, detachment of the band-shaped drain material can be eliminated, and the band-shaped drain materials can be reliably connected to each other.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the band-shaped drain material joint structure of the present invention, FIG. 2 is a cross-sectional view of FIG. 1, FIG. 3 is a perspective view of a connection fitting shown in FIG. 1, and FIG. It is a perspective view which shows a belt-shaped drain material joint structure. 10 Connection fitting (cylindrical member), 11 Opening, 12, 13
Locking piece, 20, 30 ... band-shaped drain material, 21, 31 ... hole,

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshimitsu Fujiwara 1-11-25 Higashioi, Shinagawa-ku, Tokyo Inside Goyo Construction Co., Ltd. (72) Inventor Ken Yoshimura 1-11 Higashioi, Shinagawa-ku, Tokyo No. 25 Goyo Construction Co., Ltd.

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical member having a hollow thin plate structure and having openings at both ends, and a thin plate structure having a cross section slightly smaller than the opening, and is housed in the cylindrical member by being press-fitted from each opening to face each other. The band-shaped drain material is provided with a number of slit-shaped holes on its outer wall, and the tubular member allows the band-shaped drain material to move freely in the press-fitting direction. A joint structure for a band-shaped drain material, wherein a locking piece that locks with a hole of the band-shaped drain material and fixes the band-shaped drain material is disposed on an inner wall in a direction.