JP2003268815A - Method for laying collecting pipe on bottom of water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the need for the back-filling works of a filter medium, and to prevent the positional displacement of a collecting pipe. <P>SOLUTION: In the laying method, a collecting-pipe block 10 is used. The block 10 has a collecting-pipe unit 12, a frame body 14 and the filter medium 16, and the whole shape is formed in a rectangular shape. The unit 12 is penetrated and installed into the frame body 14 so that an end section is projected to the outside from the two opposed surfaces of the frame body 14. The filter medium 16 is used for removing a foreign substance from water taken into the unit 12, and has a fine filter medium 16a, a coarse filter medium 16b and an intermediate filter medium 16c. In the collecting-pipes 10, numbers required for constructing collecting pipes are manufactured previously, and the blocks 10 are immersed on the natural ground 18 of the bottom of the water. The units 12 of the blocks 10 are mounted adjacently so that end sections are adjoined mutually in this case, and sections among the end sections of the units 12 are connected to communicate with each other. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a water bottom of a water collecting pipe.

[0002]

2. Description of the Related Art When water for waterworks is taken from rivers, lakes or marshes, or when water to be introduced into a desalination plant is taken from the sea, a perforated water collecting pipe with a through hole at the bottom is used. Is laid.

Conventionally, a method as shown in FIG. 6 has been adopted as a method for laying this kind of water collecting pipe on the water bottom.
In the laying method shown in the figure, after excavating the water bottom site board 1, the water collection pipe 2 is installed at the excavation site, and the tremie pipe 3 is used from the upper side to filter the crushed stone, sand, etc. I was backfilling.

However, such a conventional water bottom laying method for the water collecting pipe has the following technical problems.

[0005]

That is, in the laying method shown in FIG. 6, when the filter medium 4 is fed from the tremie pipe 3 when the water collection pipe 2 is backfilled, the water collection pipe 2 is made by the filter medium 4.
There was a problem that the installation position of moved.

Immediately after installing the water collecting pipe 2,
When the backfilling of the filter medium 4 is not carried out, the circumference | surroundings of the water collection pipe 2 will be buried by movement of the sediment of the seabed, the water bottom, the lake bottom, and the swamp bottom, and the circumference | surroundings of the water collection pipe 2 will be covered with the predetermined filter medium 4. This is necessary, and for this purpose, it is necessary to perform work such as removing the accumulated soil and sand, so it was necessary to refill the filter medium 4 at an early stage.

Further, when a plurality of types of earth and sand or crushed stone are used as the filter medium 4, if these are put into the tremie tube 3, they will be mixed in the vicinity of the boundary layer, making it difficult to control the layer thickness. There was also a problem.

The present invention has been made in view of such conventional problems, and an object of the present invention is to eliminate the need for backfilling the filter medium and to cause the displacement of the water collecting pipe. It is an object of the present invention to provide a method of laying a water bottom of a water collecting pipe that allows easy layer management even when a plurality of types of filter media are used.

[0009]

In order to achieve the above object, the present invention provides a method for laying a perforated water collecting pipe which is provided with a through hole, is laid on the bottom of a water, and takes in water such as seawater into the inside thereof. The water collecting pipe includes a water collecting pipe unit that is divided into a plurality of parts along the axial direction, and a frame body in which the water collecting pipe unit is arranged so as to project through the end portion and water can be taken in from the upper end side. , A pre-fabricated water collecting pipe block including a filter medium filled in the frame body, and a plurality of the water collecting pipe blocks are sequentially installed adjacent to each other on the bottom floor of the water bottom, and the end portions of the water collecting pipe unit are connected to each other. I tried to make a communication connection.
According to the water bottom laying method of the water collecting pipe configured in this manner, the water collecting pipe, the water collecting pipe unit divided into a plurality along the axial direction, the water collecting pipe unit is arranged so as to penetrate through so that the end portion projects, Since it is prefabricated as a water collection tube block that includes a frame body that allows water to be taken in from the upper end side and a filter medium that is filled in the frame body, when the water collection tube block is installed on the water bottom site board, No positional deviation occurs in the water pipe unit. In addition, the water collection pipe block, a water collection pipe unit, a frame body that is arranged so as to penetrate the water collection pipe unit so that the end portion protrudes, and that allows water to be taken in from the upper end side, and a filter medium filled in the frame body. Therefore, it is not necessary to backfill the filter medium when the water collecting pipe block is installed on the water bottom site board. Furthermore, since the filter medium is filled in the frame that allows water to be taken in from the upper end side, even when using multiple types of filter medium, it is possible to easily prevent both from being mixed near the boundary. It is also possible to easily manage each filter material layer.

The frame body can be formed such that the upper end is opened or a net material such as a wire net is provided at least on the upper end side so that water can be taken in from these portions.

The filter medium is a fine filter medium made of sand having a small particle size, a coarse filter medium made of crushed stone having a large particle size, and an intermediate filter medium made of crushed stone having a controlled particle size and having an intermediate particle size. And filling the rough filter medium on the bottom side of the frame body and burying the water collecting pipe unit therein, and at the upper side of the rough filter medium, the intermediate filter medium and the fine filter medium. And can be filled in layers in this order.

The filter medium has a fine filter medium made of sand having a small particle size and a coarse filter medium made of crushed stone having a large particle size, and the coarse filter medium is arranged on the outer periphery of the water collecting pipe unit. In addition, the fine filtration material can be arranged on the outer peripheral side of the coarse filtration material.

The frame body comprises an inner frame and an outer frame for accommodating the inner frame therein. The inner frame is filled with the coarse filtering material, and the fine filtration is provided between the inner and outer frames. The material can be filled.

To connect the ends of the water collecting pipe unit to each other, a pair of half-divided covers are provided on the outer periphery in a state where the ends are in contact with each other, and the covers are tightly connected, or It is possible to select one of the ends by forming a different diameter portion that can be fitted in the other end on one of the ends and fitting and connecting the ends.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 show a first embodiment of a water bottom laying method for a water collecting pipe according to the present invention.

The embodiment shown in the figure is a method of laying a perforated water collecting pipe which is provided with a through hole and is installed on the bottom of the sea, water, lake, swamp, etc., for taking in water such as seawater into the inside. In this laying method, the water collecting pipe block 10 shown in FIG. 1 is used. Water collection pipe block 10 shown in FIG.
Is provided with a water collection pipe unit 12, a frame body 14, and a filtering material 16, and is formed in a rectangular tube shape as a whole. The water collection pipe unit 12 is obtained by dividing the entire length of a water collection pipe having a circular cross-section with a planned length to be laid into a predetermined length along the axial direction, and a large number of through holes are formed in the peripheral surface thereof. Both ends in the axial direction are open. The frame body 14 is made of a net material such as a wire mesh only on the upper end side, and is made of a flat plate on the other surface, and is formed in a rectangular box shape capable of taking in water such as seawater from the upper end side. ing. The frame 14
Does not have to be limited to this configuration.For example, all six sides may be made of a net material, or the upper end may be opened,
Water can be taken in through this opening. As shown in detail in FIG. 2, the water collection pipe unit 12 is penetratingly installed in the frame body 14 so that ends thereof project outward from two facing surfaces of the frame body 14. In addition,
The water collecting pipe unit 12 does not have a through hole in a portion projecting outward from the frame body 14, and a through hole for taking in water is provided only in a portion located in the frame body 12. Has been.

The filter medium 16 is for removing foreign matters from the water taken into the water collection pipe unit 12, and in the case of this embodiment, a fine filter medium 16a made of sand having a small particle size,
A coarse filter medium 16b made of crushed stone having a large particle size and a fine filter medium 16a made of crushed stone having a controlled particle size and a coarse filter medium 1
6b and an intermediate filter medium 16c set in the middle.

Such a filter medium 16 is formed by filling the bottom side of the frame body 14 with the coarse filter medium 16b so as to have a predetermined thickness.
The water collection pipe unit 12 is embedded in the inside thereof, and the intermediate filter medium 16c and the fine filter medium 16a are filled in the order of this order on the upper side of the coarse filter medium 16b in a layered form having a predetermined thickness.

Since the filter media 16 have different particle sizes, the packing densities per unit volume are different. The coarse filter media 16b has the smallest packing density and the fine filter media 16a has the large packing density. It has become.

That is, in the case of the present embodiment, three kinds of filter media 16 having different particle sizes are used, and when the distance from the water collection pipe unit 12 on the outer peripheral side of the water collection pipe unit 12 becomes large, the filtration density is increased. The density gradient is set so that Filter medium 16 having such a density gradient
By adopting, it is possible to maintain the filtering function for a long time. The mesh of the net material provided on the upper end of the frame body 14 is such that the fine filtration material 16a does not penetrate. The filter material 16 does not necessarily need to use three types, and may use one type or two types. The water collection pipe block 10 having the above-described configuration is manufactured in advance in a quantity required for constructing the water collection pipe, and then transported to the site where the water collection pipe is laid. At the site where the water collecting pipe is laid, the ground floor 18 at the water bottom is leveled by excavation or the like, and the water collecting pipe block 10 is sunk above the ground.

As shown in FIG. 2, the water collecting pipe blocks 10 are closely arranged so that the ends of the water collecting pipe units 12 of the water collecting pipe blocks 10 are adjacent to each other. In the case of this embodiment, the half-split cover 20 shown in FIG. 6B is used for the communication connection between the ends of the water collection pipe unit 12.

The half-split cover 20 is formed by vertically splitting a cylinder (both having an inner diameter slightly larger than the diameter of the water collection pipe unit 12) open at both ends, and has a pair of semi-circular curves. It is composed of a curved plate.

When the covers 20 are connected for communication, a pair of half-divided covers 20 are provided on the outer circumference with the ends of the pair of adjacent water collection pipe units 12 in contact with each other.
Is covered, and the covers 20 are tightly connected to each other with a bolt and a nut or the like.

Then, by connecting the water collecting pipe units 12 of the predetermined number of water collecting pipe blocks 10 to each other, a desired water collecting pipe is laid on the bottom of the water. The periphery of the water collecting block 10 laid on the bottom of the water can be backfilled with the same material as the three types of filter media 16 as shown in FIG. 1, but this backfilling is not always necessary. In addition, it is not necessary to use such a material when backfilling. Now, according to the water bottom laying method of the water collecting pipe configured as described above, the water collecting pipe is configured such that the water collecting pipe unit 12 is divided into a plurality of parts along the axial direction, and the water collecting pipe unit 12 projects the end portion. The water collecting pipe block 10 is preliminarily manufactured as a water collecting pipe block 10 including a frame body 14 having a top end side formed of a net material such as a wire mesh, and a filter medium 16 filled in the frame body 14, so that the water collecting pipe block is provided. When 10 is installed on the water bottom site board 18, no positional deviation occurs in the water collecting pipe unit 12. Further, the water collection pipe block 10 includes a water collection pipe unit 12, a frame body 14 which is arranged so as to penetrate the water collection pipe unit 12 such that an end portion thereof protrudes, and an upper end side of which is formed of a net material such as a wire mesh, and a frame body 14. Filter material 16 filled inside
Therefore, it is not necessary to backfill the filter medium 16 when the water collecting pipe block 10 is installed on the water bottom site board.
Further, since the filter medium 16 is filled in the frame body 14 whose upper end side is formed of a net material such as a wire mesh, it is easy to mix the two in the vicinity of the boundary even when a plurality of types of filter medium 16 are used. It is possible to prevent the above, and it is possible to easily manage each filter material layer. FIG. 3 shows a second embodiment of the water bottom laying method for a water collecting pipe according to the present invention. The same or corresponding parts as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. Only the characteristic points will be explained. In the embodiment shown in the figure, as in the first embodiment, a water collection pipe block 10 manufactured in advance is used, and the water collection pipe block 10 includes the water collection pipe unit 12
And a frame body 14 in which the water collection pipe unit 12 is penetrated so as to project the end portion, and the upper end side is formed of a net material such as a wire mesh, and a filter medium 16 filled in the frame body 14. There is. As the filter medium 16, three types of filter medium 16 having different particle sizes are used, and on the outer peripheral side of the water collection pipe unit 12, a density gradient that increases the filtration density when the distance from the water collection pipe unit 12 increases It is provided. At the end of the water collection pipe unit 12, a different diameter portion 22 that can be fitted into the other end is formed. When laying a water collecting pipe on the water bottom using such a water collecting pipe block 10, the different diameter portion 22 of the water collecting pipe unit 12 is placed inside the water collecting pipe unit 12 of another water collecting pipe block 10 that is adjacently installed. A communication connection is made by inserting and connecting the ends to each other. In the case of the second embodiment configured in this way, the communication connection between the water collection pipe units 12 in water can be performed more easily than in the case of the first embodiment, and the work efficiency is also improved. Figure 4
Shows a third embodiment of the water bottom laying method for a water collecting pipe according to the present invention, and the same or corresponding portions as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted.
Only the characteristic points will be described below. In this embodiment, the different diameter portion 22a of the third embodiment shown in FIG. 3 is constructed as follows. The different-diameter portion 22a of the present embodiment includes a small-diameter portion 220a and a large-diameter portion 2 into which the small-diameter portion 220a can be fitted.
21 and 21. The small diameter portion 220 a is provided at one end of the water collection pipe unit 12 of the one water collection pipe block 10 and projects outward from the end surface of the block 10. The large diameter portion 221a is connected to the other water collecting pipe block 10
It is internally provided at one end of the water collection pipe unit 12, and this portion does not project outward from the end surface of the block 10.
When the water collecting pipe blocks 10 are communicatively connected to each other by fitting and connecting the ends with the different diameter portion 22a,
It is possible to install the blocks 10 in close contact with each other without providing a gap between them. FIG. 5 shows a fourth embodiment of the water bottom laying method for a water collecting pipe according to the present invention. The same or corresponding parts as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. Only the characteristic points will be explained. In the embodiment shown in the figure, substantially the same as the first embodiment, the water collecting pipe block 1 manufactured in advance is manufactured.
0a is used, and the water collection pipe block 10a includes a water collection pipe unit 12a and a frame body 1 in which the water collection pipe unit 12a is arranged in a penetrating manner (the front-back direction of FIG. 4) so as to project the end portion.
4a and the filter medium 16 filled in the frame 14a. In the case of the present embodiment, the frame body 14a includes an inner frame 140a formed in a cubic shape with a net material such as a wire mesh, and an outer frame 141a that accommodates the inner frame 140a therein. The filter medium 16 is composed of a coarse filter medium 16b made of crushed stone or the like having a large particle size, and an intermediate filter medium 16c made of crushed stone of which particle size is adjusted and having a particle size smaller than that of the coarse filter medium 16b. The water collection pipe unit 12a with both ends open is
The inner frame 140a extends horizontally through the center of the inner frame 140a.
Coarse filtering material 16b is filled in a. And
An intermediate filter material 16c is filled between the inner and outer frames 140a and 141a. Water collection pipe block 1 configured in this way
Like the above-mentioned embodiment, 0a is installed adjacently on the water bottom site board 18, and the end portions of the water collection pipe unit 12 are communicated with each other by either the half cover 20 or the fitting structure shown in FIG. It is connected to form a predetermined water collection pipe.

In the case of this embodiment, two kinds of filter media 1 are used.
Since the inner and outer frames 140a and 141a are filled with 6b and 16c, respectively, they never mix with each other, and even when the water collection pipe unit 10a is manufactured, the outer frame 14
The intermediate filter medium 16c is laid on the bottom of 1a, and the inner frame 1401a filled with the coarse filter medium 16b is placed above the intermediate filter medium 16c, and the intermediate filter medium 16c is placed between the inner and outer frames 140a and 141a.
Since the upper end of the outer frame 141a may be closed, the manufacturing itself can be easily performed.

The filter medium 1 of the fourth embodiment shown in FIG.
No. 6 can replace one of the filter materials with the above-described fine filter material. In addition, in the above embodiment, the water collecting pipe block 1
Although 0 and 10a exemplarily have a rectangular tube shape or a rectangular parallelepiped shape, the practice of the present invention is not limited to this.
For example, the shape may be a cylindrical shape, a polygonal cylindrical shape, or the like.

[0027]

As described above in detail, according to the method of laying the bottom of the water collecting pipe according to the present invention, the backfilling work of the filter medium is unnecessary, and the displacement of the water collecting pipe does not occur.
Layer management can be easily performed even when a plurality of types of filter media are used.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a laid state of a water collection pipe block used in a first embodiment of a water bottom laying method for a water collection pipe according to the present invention.

FIG. 2 is an explanatory diagram when the water collection pipe blocks shown in FIG. 1 are connected for communication.

FIG. 3 is a principal part explanatory view showing a second embodiment of a water bottom laying method for a water collecting pipe according to the present invention.

FIG. 4 is a principal part explanatory view showing a third embodiment of the water bottom laying method for a water collecting pipe according to the present invention.

FIG. 5 is a cross-sectional explanatory view of a laid state of a water collection pipe block used in a fourth embodiment of the water bottom laying method for a water collection pipe according to the present invention.

FIG. 6 is an explanatory diagram of a conventional water pipe laying method.

[Explanation of symbols]

10,10a Water collection tube block 12, 12a Water collection pipe unit 14,14a frame 16 Filter material 16a Fine filtration material 16b Coarse filter medium 16c Intermediate filter material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shozo Kato             2-15-2 Konan, Minato-ku, Tokyo Co., Ltd.             Obayashi Head Office (72) Inventor Takashi Kurimoto             2-15-2 Konan, Minato-ku, Tokyo Co., Ltd.             Obayashi Head Office

Claims (6)

[Claims] 1. A method of laying a perforated water collecting pipe having a through hole, which is laid at the bottom of the water and takes in water such as seawater, wherein the water collecting pipe is divided into a plurality of pieces along an axial direction. A water collection pipe comprising a water collection pipe unit, a frame body through which the water collection pipe unit projects so as to project an end thereof, from which water can be taken in from the upper end side, and a filter medium filled in the frame body A method of laying a bottom of a water collecting pipe, wherein a plurality of the water collecting pipe blocks are preliminarily manufactured as blocks, and the plurality of water collecting pipe blocks are sequentially and adjacently installed on a water bottom site board, and the ends of the water collecting pipe units are connected for communication. 2. The frame body is characterized in that an upper end thereof is opened, or at least an upper end side is provided with a net material such as a wire mesh, and water can be taken from these portions. The method for laying a water bottom of a water collection pipe according to claim 1. 3. The intermediate filter having a medium particle size, wherein the filter material is a fine filter material made of sand having a small particle size, a coarse filter material made of crushed stone having a large particle size, and a crushed stone having a adjusted particle size. And filling the rough filtration material on the bottom side of the frame body and burying the water collection pipe unit inside thereof, and at the upper side of the rough filtration material, the intermediate filtration material and the fine filtration material. The method for laying a water bottom of a water collecting pipe according to claim 1, wherein the filter material is filled in layers in this order. 4. The filter medium comprises a fine filter medium made of sand having a small particle size and a coarse filter medium made of crushed stone having a large particle size, and the coarse filter medium is provided on the outer periphery of the water collection pipe unit. 2. The method of laying a water bottom of a water collecting pipe according to claim 1, wherein the fine filtration material is arranged on the outer peripheral side of the coarse filtration material. 5. The frame body includes an inner frame and an outer frame that accommodates the inner frame therein. The inner frame is filled with the rough filter material, and the frame is provided between the inner and outer frames. The method for laying a water bottom of a water collecting pipe according to claim 3, wherein the method is filled with a fine filtering material. 6. The communication connection between the end portions of the water collection pipe unit, in a state where the end portions are in contact with each other, a pair of half-divided covers are provided on the outer periphery to tightly connect the covers. Alternatively, one of the end portions is formed with a different diameter portion that can be fitted in the other end portion, and the end portions are fitted and coupled to each other. To 4
The method for laying the water bottom of the water collection pipe according to any one of 1.