JP4122804B2 - How to lay the bottom of the drainage pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for laying a bottom of a water collecting pipe.
[0002]
[Prior art]
When water for water supply is taken from rivers or lakes, or when water to be introduced into a desalination treatment facility is taken from the sea, a perforated water collecting pipe with a through hole at the bottom is laid.
[0003]
Conventionally, a method as shown in FIG. 5 has been adopted as a method of laying this type of water collecting pipe on the bottom of the water. In the laying method shown in the figure, after excavating the bottom bottom panel 1, a water collecting pipe 2 is installed at the excavation site, and a filter medium 4 such as crushed stone or sand is attached from the upper side using the tremy pipe 3. I was backfilling.
[0004]
However, such a conventional method for laying the bottom of a water collecting pipe has the following technical problems.
[0005]
[Problems to be solved by the invention]
That is, in the laying method shown in FIG. 5 , when the filter medium 4 is introduced from the tremy pipe 3 when the water collection pipe 2 is backfilled, the installation position of the water collection pipe 2 is moved by the filter medium 4.
[0006]
Further, if the filter medium 4 is not backfilled immediately after the water collecting pipe 2 is installed, the surroundings of the water collecting pipe 2 are buried due to the movement of the sediment at the sea bottom, water bottom, lake bottom, swamp bottom, and the water collecting pipe. The surroundings of 2 need to be covered with a predetermined filter material 4, and for this purpose, an operation such as removing accumulated sediment is necessary, and therefore, it is necessary to backfill the filter material 4 at an early stage. It was.
[0007]
Further, when a plurality of types such as earth and sand and crushed stones are used for the filter medium 4, if they are introduced through the tremy tube 3, they are mixed in the vicinity of the boundary layer, which makes it difficult to manage the layer thickness. It was.
[0008]
The present invention has been made in view of such conventional problems, and the purpose of the present invention is that the backfilling operation of the filter medium is unnecessary, and no misalignment of the water collecting pipe occurs, Another object of the present invention is to provide a method for laying the bottom of a water collecting pipe that can easily manage layers even when a plurality of types of filter media are used.
[0009]
[Means for Solving the Problems]
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. A water collecting pipe unit divided into a plurality along the pipe, a frame body in which the water collecting pipe unit is disposed so as to protrude from the end portion, and water can be taken from the upper end side, and a filtration filled in the frame body A water collecting pipe that is manufactured in advance as a water collecting pipe block including a material, and that is installed adjacently on the bottom of the water bottom without backfilling the plurality of water collecting pipe blocks, and communicates between the ends of the water collecting pipe unit. In this method, the upper end of the frame body is opened, or a net material such as a wire net is provided on the upper end side, and water can be taken only from these upper end portions.
According to the water bottom laying method of the water collecting pipe configured as described above, the water collecting pipe is arranged in a penetrating manner such that the water collecting pipe unit is divided into a plurality along the axial direction, and the water collecting pipe unit protrudes from the end. Since it is pre-manufactured as a water collection pipe block with a frame body that can take water from the upper end side and a filter medium filled in the frame body, when the water collection pipe block is installed on the water bottom local board, No misalignment occurs in the water pipe unit. In addition, the water collecting pipe block includes a water collecting pipe unit, a frame body through which the water collecting pipe unit projects so that the end protrudes, a water body capable of taking water from the upper end side, and a filter medium filled in the frame body, Therefore, it is not necessary to refill the filter medium when the collecting pipe block is installed on the water bottom local board. Furthermore, since the filter medium is filled in a frame that can take water from the upper end side, even when multiple types of filter medium are used, they can be easily prevented from mixing in the vicinity of the boundary. In addition, each filter medium layer can be easily managed.
[0010]
The filter medium is composed of a fine filter medium made of sand having a small particle diameter, a coarse filter medium made of crushed stone having a large particle diameter, and a crushed stone adjusted in particle size, and the particle diameter is smaller than the coarse filter medium, An intermediate filter medium larger than the fine filter medium, and the coarse filter medium is disposed on the outer periphery of the water collecting pipe unit, and the intermediate filter medium and the fine filter medium are disposed on the upper side of the coarse filter medium. They can be arranged in layers.
[0011]
For the communication connection between the ends of the water collecting pipe unit, a pair of halved covers are covered on the outer periphery in a state where the ends are in contact with each other, or the covers are fastened together, or the ends One of the parts can be selected from either one having a different diameter part that can be fitted in the other end part and fitting the end parts together.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail 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.
[0013]
The embodiment shown in the figure is a method of laying a perforated water collecting pipe provided with a through hole, installed on the bottom of the seabed, water bottom, lake bottom, swamp bottom, etc., and taking water such as seawater into the inside, In this laying method, the water collecting pipe block 10 shown in FIG. 1 is used. The water collecting pipe block 10 shown in FIG. 1 includes a water collecting pipe unit 12, a frame body 14, and a filter medium 16, and the overall shape is formed in a rectangular tube shape. The water collecting pipe unit 12 is obtained by dividing the entire length of the water collecting pipe having a circular cross section of the planned length of installation into a predetermined length along its axial direction, and a large number of through holes are formed in the peripheral surface. Both ends in the axial direction are open. The frame body 14 is formed of a net material such as a wire mesh only on the upper end side and is formed of a flat plate on the other surface, and is formed in a rectangular box shape that can take in water such as seawater from the upper end side. ing. As shown in detail in FIG. 2, the water collecting pipe unit 12 is installed through the frame body 14 so that the end portion protrudes outward from two opposing surfaces of the frame body 14. The water collecting pipe unit 12 is not provided with a through hole in a portion protruding outward from the frame body 14, and the through hole for taking water into the inside is formed in a portion located in the frame body 12. Only provided.
[0014]
The filter medium 16 removes foreign matters from the water taken into the water collecting pipe unit 12, and in the case of this embodiment, the filter medium 16a is made of fine filter medium 16a made of sand having a small particle diameter and crushed stone having a large particle diameter. The coarse filter medium 16b is composed of a crushed stone whose particle size is adjusted, and the intermediate filter medium 16c has a particle size set between the fine filter medium 16a and the coarse filter medium 16b.
[0015]
Such a filter medium 16 is filled with a coarse filter medium 16b on the bottom side of the frame body 14 so as to have a predetermined thickness, and the water collecting pipe unit 12 is embedded therein, and on the upper side of the coarse filter medium 16b. The intermediate filter material 16c and the fine filter material 16a are filled in this order in a layer shape having a predetermined thickness.
[0016]
Since the filter media 16 have different particle sizes, the packing density per unit volume is different, the portion of the coarse filter media 16b has the smallest density, and the portion of the fine filter media 16a has a high packing density. Yes.
[0017]
That is, in the case of the present embodiment, three types of filter media 16 having different particle sizes are used, and the filtration density increases as the distance away from the water collection pipe unit 12 increases on the outer peripheral side of the water collection pipe unit 12. Such a density gradient is provided. When the filter medium 16 having such a density gradient is employed, the filtration function can be maintained over a long period of time. Note that the mesh of the net material provided at the upper end of the frame body 14 has a basis weight through which the fine filter material 16a does not pass. Note that three types of filter media 16 are not necessarily used, and one or two types may be used. As for the water collecting pipe block 10 provided with the above structures, the quantity required for construction of a water collecting pipe is produced in advance, and then transported to the laying site of the water collecting pipe. At the site where the water collecting pipe is laid, the ground floor 18 is leveled by excavation or the like, and the water collecting pipe block 10 is laid on the top.
[0018]
As shown in FIG. 2, the water collecting pipe block 10 is installed close to each other so that the ends of the water collecting pipe units 12 of the water collecting pipe blocks 10 are adjacent to each other. And in the case of a present Example, the half-shaped cover 20 shown to the same figure (B) is used for the communication connection between the edge parts of the water collecting pipe unit 12. FIG.
[0019]
The half-divided cover 20 is a vertically divided cylinder (both inner diameters slightly larger than the diameter of the water collecting pipe unit 12) open at both ends, and is a pair of curved plates curved in a semicircular shape. It is composed of
[0020]
When communicating using the cover 20, the pair of half-split covers 20 are covered on the outer periphery with the ends of a pair of adjacent water collecting pipe units 12 in contact with each other. This is done by connecting 20 pieces together with a bolt and a nut.
[0021]
Then, when the water collecting pipe units 12 of the predetermined number of water collecting pipe blocks 10 are connected to each other, a desired water collecting pipe is laid on the bottom of the water. In addition, for example, as shown in FIG. 1, 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, but this backfilling is not always necessary. And not.
[0022]
Now, according to the method of laying the bottom of the water collecting pipe configured as described above, the water collecting pipe is divided into a plurality of water collecting pipe units 12 along the axial direction, and the water collecting pipe unit 12 projects from the end. The water collecting pipe block 10 is pre-manufactured as a water collecting pipe block 10 including a frame body 14 having a top end formed of a net material such as a wire mesh and a filter medium 16 filled in the frame body 14. When 10 is installed on the water bottom local board 18, no positional deviation occurs in the water collecting pipe unit 12. The water collecting pipe block 10 includes a water collecting pipe unit 12, a frame body 14 in which the water collecting pipe unit 12 is disposed so as to protrude from the end portion, and an upper end side formed of a net material such as a wire net, and the frame body 14. Since the filter medium 16 filled therein is provided, it is not necessary to backfill the filter medium 16 when the water collecting pipe block 10 is installed on the water bottom local board. Furthermore, since the upper end side of the filter medium 16 is filled in the frame body 14 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. The filter medium layers can be easily managed.
[0023]
FIG. 3 shows a second embodiment of a method for laying a bottom of a water collecting pipe according to the present invention. The same or corresponding parts as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted. Only the feature points will be described. In the embodiment shown in the figure, a pre-manufactured water collecting pipe block 10 is used as in the first embodiment. The water collecting pipe block 10 has a water collecting pipe unit 12 and an end portion of the water collecting pipe unit 12. A frame body 14 is provided so as to project so as to protrude, 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 is provided. As the filter medium 16, three types of filter media 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 as the distance away from the water collection pipe unit 12 increases. Provided. An end portion of the water collecting pipe unit 12 is formed with a different diameter portion 22 that can be fitted into the other end portion. When laying a water collection pipe on the bottom of the water using such a water collection pipe block 10, the different diameter portion 22 of the water collection pipe unit 12 is placed in the water collection pipe unit 12 of another water collection pipe block 10 installed adjacent thereto. The connection is established by inserting and fitting the ends together. In the case of the second embodiment configured as described above, communication connection between the water collecting pipe units 12 in water can be performed more easily than in the case of the first embodiment, and the work efficiency is improved.
[0024]
FIG. 4 shows a third embodiment of the method for laying a bottom of a water collecting pipe according to the present invention. The same or corresponding parts as those in the above embodiment are designated by the same reference numerals and the description thereof is omitted. Only the feature points will be described. In this embodiment, the different diameter portion 22a of the third embodiment shown in FIG. 3 is configured as follows. The different diameter portion 22a of the present embodiment includes a small diameter portion 220a and a large diameter portion 221 to which the small diameter portion 220a can be fitted. The small-diameter portion 220 a is provided at one end of the water collecting pipe unit 12 of one water collecting pipe block 10 and protrudes outward from the end surface of the block 10. The large diameter portion 221 a is provided at one end of the water collecting pipe unit 12 of the other water collecting pipe block 10 to be connected, and this portion does not protrude outward from the end face of the block 10. By fitting and connecting the end portions with such different-diameter portions 22a, the water collecting pipe blocks 10 can be connected to each other without being provided with a gap between the blocks 10 .
[0025]
In the above-described embodiment , the water collecting pipe blocks 10 and 10a are illustrated in the shape of a rectangular tube or a rectangular parallelepiped. However, the embodiment of the present invention is not limited to this. It may be a cylindrical shape.
[0026]
【The invention's effect】
As described above in detail, according to the method for laying a bottom of a water collecting pipe according to the present invention, a backfilling operation of the filtering material is unnecessary, and no misalignment of the water collecting pipe occurs, and a plurality of types of filtering materials are used. Even when using, layer management can be performed easily.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a cross-sectional explanatory view of a collecting pipe block used in a first embodiment of a method for laying a bottom of a collecting pipe according to the present invention.
FIG. 2 is an explanatory diagram when the water collection pipe block shown in FIG. 1 is connected in communication.
FIG. 3 is a main part explanatory view showing a second embodiment of the method of laying the bottom of the water collecting pipe according to the present invention.
FIG. 4 is a main part explanatory view showing a third embodiment of a method for laying a bottom of a water collecting pipe according to the present invention.
FIG. 5 is an explanatory diagram of a conventional method for laying a water collecting pipe.
[Explanation of symbols]
10, 10a Water collecting pipe block 12, 12a Water collecting pipe unit 14, 14a Frame 16 Filter medium 16a Fine filter medium 16b Coarse filter medium 16c Intermediate filter medium

Claims (3)

In the method of laying a perforated water collecting pipe provided with a through hole, laid on the bottom of the water, and taking in water such as seawater,
The water collecting pipe is divided into a plurality of water collecting pipe units along the axial direction, a frame body that is arranged to penetrate the water collecting pipe unit so that the end protrudes, and is capable of taking water from the upper end side; Produced in advance as a water collecting pipe block with a filter medium filled in the frame body,
A method of laying a water bottom of a water collecting pipe, which is sequentially installed on a water bottom local board without backfilling a plurality of the water collecting pipe blocks, and communicates between ends of the water collecting pipe unit,
The frame body is open at the upper end or provided with a net material such as a wire mesh on the upper end side, and is formed so as to be able to take water only from these upper end portions. Laying method. The filter medium is composed of a fine filter medium made of sand having a small particle diameter, a coarse filter medium made of crushed stone having a large particle diameter, and a crushed stone adjusted in particle size, and the particle diameter is smaller than the coarse filter medium, An intermediate filter medium larger than the fine filter medium, and the coarse filter medium is disposed on the outer periphery of the water collecting pipe unit, and the intermediate filter medium and the fine filter medium are disposed on the upper side of the coarse filter medium. The water bottom laying method for a water collecting pipe according to claim 1, wherein the water bottom pipe is laid out in layers. For the communication connection between the ends of the water collecting pipe unit, a pair of halved covers are covered on the outer periphery in a state where the ends are in contact with each other, or the covers are fastened together, or the ends 3. The method according to claim 1, wherein a different diameter portion that can be fitted in the other end portion is formed in one of the portions, and the end portions are selected from fitting and coupling. How to lay the bottom of the drainage pipe.

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