JP2012193502A - Fixed type dam dredging system and method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure operators who perform special work accompanying dredging in a conventional dam dredging method and to eliminate dangerous work, regarding a fixed type dam dredging method.SOLUTION: A dredge pump 1 comprising a sand discharge pipe 4 having a skirt part at the lower part, a high pressure water jetting pipe 5 for jetting drive water to the skirt part to discharge slurry sediment from the sand discharge pipe and a liquefaction jetting pipe 7 disposed at the lower part of the sand discharge pipe for liquefying sediment around a nozzle by liquefaction water jetted from the nozzle is formed. In the fixed type dam dredging method, the dredge pump 1 is fixed and installed at a desired position in a lake 2, and the dredge pump 1 is driven to discharge sediment 2a deposited at the lake bottom to a disposal area.

Description

  The present invention relates to a fixed dam dredging system for dredging sand accumulated in a dam lake or lake and its construction method.

  The dredging and treatment of sand accumulated in dam lakes and lakes is necessary to maintain the water storage capacity of dams and the like, especially in dams for hydroelectric power generation, sedimentation near the water intake is a problem. Therefore, as a conventional dredging method, for example, dredging with a grab by a grab ship, or as described in Patent Document 1 or Patent Document 2, a work ship or the like is floated on a dam lake or a lake, or a pump ship or Dredging with an underwater sand pump. Such a dam construction method is known.

JP 2004-92077 A JP 2008-223433 A

  However, in the conventional dam dredging method, workers with special techniques are required for operations of grab ships and cutter pump ships and handling of submersible sand pumps by crane ships.技術 Technology succession is a problem. In addition to dredgers, drawing boats, etc. are required, which is a large-scale construction, and every time dredging work, dredgers must be transported to the dam lake or lake by land. Furthermore, because of dredging work by the work boat, dangerous work such as boat transfer, anchor replacement, setup change, etc. occurs. The dredging work according to the prior art cannot suppress the occurrence of turbidity. The fixed dam dredging system and its construction method according to the present invention have been proposed in order to solve such problems.

  The gist of the present invention for solving the above-mentioned problems of the fixed dam dredging system according to the present invention is to provide a sand discharge pipe having a skirt portion at a lower portion thereof, and to discharge the earth and sand by injecting driving water into the skirt portion. It consists of a high-pressure water injection pipe that discharges sand from the sand pipe, and a liquefied injection pipe that liquefies the earth and sand around the nozzle with liquefied water that is disposed at the bottom of the sand discharge pipe and is injected from the nozzle. A dredging pump installed in the accumulated sediment, a water intake pump connected to the high-pressure water injection pipe and the liquefaction injection pipe of the dredging pump and supplying water from the dam lake, and a drainage of the dredging pump One end is connected to the sand pipe and the other end is led out to the earth disposal site, and on the lake, it is composed of a sand discharge connecting pipe supported by a floater.

  The combination of the pipe and the nozzle in the liquefied spray pipe is such that a nozzle is provided in a pipe extending in the horizontal direction, a pipe extending in the horizontal direction, a vertical pipe suspended from the middle of the horizontal pipe, and the pipe This includes the fact that there are nozzles provided on the vertical pipe.

  In addition, the nozzle outlets of the liquefied injection pipe are all directed downwards, all are installed toward the skirt portion of the sand discharge pipe, and those that are installed downward and sand discharge This includes any of those installed in a mixed manner with the one installed toward the skirt portion of the pipe.

The gist for achieving the object by solving the above-mentioned problems of the fixed dam construction method according to the present invention is as follows:
A sand discharge pipe having a skirt portion at the bottom, a high-pressure water injection pipe for discharging driving water to the skirt portion and discharging sand from the sand discharge tube, and a nozzle disposed at the bottom of the sand discharge tube A dredging pump comprising a liquefied injection pipe for liquefying the earth and sand around the nozzle with the liquefied water formed, and fixing the dredging pump at a desired position in the lake, the dredging pump Is to drive the earth and sand deposited on the bottom of the lake to the sand disposal site.

  The gist of the present invention for solving the above-mentioned problems of the fixed dam construction method according to the present invention is to provide a sand discharge pipe having a skirt portion at a lower portion, and drive water to the skirt portion to inject the sediment. A high-pressure water injection pipe for discharging sand from a sand pipe, and a pipe disposed at a lower part of the sand discharge pipe, and liquefying earth and sand around the nozzle with liquefied water injected from a nozzle provided in the pipe A dolphin pump comprising a liquefied injection pipe to be supported, and the dolphin pump and the intake pump for taking water from the lake and supplying the pump to the dredging pump from the bottom of the lake by a pillar pile of dolphin Supporting the superstructure and installing the dredging pump in the sediment deposited on the bottom of the lake, one end is connected to the sand pumping pipe of the dredging pump, and the other end is led from the lake surface to a predetermined soil disposal site. The sand removal chain A pipe is arranged from the surface of the lake to the soil disposal site, and the water intake pump is driven to inject high pressure water from the nozzle of the high pressure water injection pipe to the skirt portion of the sand discharge pipe in the dredge pump, and the liquefaction injection The liquefied water is sprayed from the pipe onto the sediment accumulated on the bottom of the lake, and the sediment is slurried from the sand discharge pipe of the dredging pump into the slurry using the waste sand connecting pipe and discharged into the soil disposal site.

  Further, the combination of the pipe and the nozzle in the liquefied injection pipe includes a pipe provided in the horizontal direction, a nozzle provided in the horizontal direction, and a vertical pipe suspended from the middle of the horizontal pipe. And a nozzle provided on the vertical pipe.

  Further, the nozzle outlets of the liquefied injection pipe are all installed downward, all are installed toward the skirt portion of the sand discharge pipe, and those installed downward and the sand discharge. This includes any of those installed in a mixed manner with the one installed toward the skirt portion of the pipe.

According to the fixed dam dredging system and the construction method of the present invention, dredging pumps are permanently installed in, for example, a dam lake, so that dredging can be easily performed by anyone without requiring a special technique.
In addition, work on the lake is eliminated, and special work by dredgers and work boats is eliminated. This is an effective construction method for securing workers and safety.
Since the dredging pump is in the earth and sand, it becomes a construction method that does not cause turbidity and has a high slurry mud content and low energy consumption in slurry transportation.
Since there are no rotating parts or other mechanical parts in the collar, there is no fear of wear or mechanical failure. Moreover, since it is not a dredging by an underwater sand pump, there are many excellent effects that an electric motor, a cable, and the like are not submerged in water and are highly safe.

It is sectional drawing for description which shows the outline | summary of the fixed dam construction method concerning this invention. It is a reference figure which shows a preferable location as a place to which the fixed dam construction method according to the present invention is applied. Front view (A) of a dredge pump 1 used in the fixed dam dredging method of the present invention, a schematic perspective view (B) showing the configuration of the use state, and perspective views of dredge pumps 1a and 1b according to other embodiments It is figure (C), (D). It is sectional drawing for description which shows the state during the dredging operation | work by the dredge pump 1. FIG. It is an expanded sectional view which expands and shows the mode of a dredging operation | work. It is sectional drawing which shows a mode that dredging the intake of a dam lake.

  As shown in FIG. 1, the fixed dam dredging method according to the present invention dreds earth and sand 2 a accumulated in a dam lake 2 or the like with a fixed dredging pump 1.

  As shown in FIGS. 2 (A) and 2 (B), the dredging pump 1 has a sand discharge pipe 4 having a skirt portion 3 at a lower portion, and sprays driving water onto the skirt portion 3 to produce slurry-like earth and sand. A high-pressure water injection pipe 5 for discharging the sand from the sand discharge pipe 4 and a liquefaction injection for liquefying the earth and sand around the nozzle 6 with liquefied water disposed at the lower part of the sand discharge pipe 4 and injected from the nozzle 6 It consists of a pipe 7.

  The dredging pump 1 is fixedly installed at a desired position in the dam lake 2. As the desired position, as shown in FIG. 1B, there are the vicinity of the upstream inflowing portion, the vicinity of the inflowing portion, the vicinity of the intake port and the like indicated by the hatched portion when viewed from above.

  As shown in FIGS. 1A and 4, a lake bottom ground is provided with a water intake pump 10 that takes water from the dredging pump 1 and the dam lake 2 and supplies the dredging pump 1 as drive water or liquefied water. 11 is supported by a dolphin superstructure 13 supported by a column pile 12 of dolphin, and the dredging pump 1 is installed in a fixed position in the earth and sand 2a deposited on the lake bottom ground 11.

  Furthermore, as shown in FIG. 1-A, the sand discharge connecting pipe 14 having one end connected to the sand discharge pipe 4 of the dredging pump 1 and the other end guided from the lake surface to a predetermined soil disposal site from above the lake surface. Place it at another place on the dam lake 2 or outside the lake. The sand removal connecting pipe 14 is supported by a plurality of floaters 14a.

  In this way, after the dredging pump 1 is fixed and installed at a desired position in the dam lake 2, the water intake pump 10 is driven, and as shown in FIG. High pressure water is sprayed from 5a onto the skirt portion 3 of the sand discharge pipe 4 in the dredge pump 1. As a result, the surrounding slurry-like earth and sand 2 a is sucked into the skirt portion 3 by negative pressure and is discharged through the sand discharge pipe 4.

  Further, the liquefied water is sprayed from the nozzle 6 of the liquefied spray pipe 7 toward the earth and sand 2 a accumulated on the lake bottom ground 11. The earth and sand 2a rolls up in a slurry state, is attracted to high-pressure water injected from the nozzle 5a of the high-pressure water injection pipe 5, and is discharged from the skirt portion 3 through the sand discharge pipe 4. Then, the earth and sand 2a is slurried from the sand discharge pipe 4 of the dredging pump 1 by the sand discharge connecting pipe 14 and discharged out of the dam lake 2. If the sand discharge connecting pipe 14 is discharged to a position lower than the water surface height of the dam lake, the slurry-like earth and sand 2a passes through the skirt portion 3 and is more easily discharged to the outside by the principle of siphon.

As shown in FIG. 4, the earth and sand 2a is formed so that, for example, a sand trap having a radius of about 26 m and a height of 15 m is indicated by a broken line, and the earth and sand 2a of 10,000 m ³ or more can be dredged. . This dredging does not cause turbidity because the dredging pump 1 is present in the earth and sand 2a.

  As Example 2 of the present invention, the combination of the pipe and the nozzle in the liquefied injection pipe is such that the nozzle 6 is provided in the pipe 7 extending in the horizontal direction as in Example 1, and FIG. As shown in FIG. 1, there is a dredging pipe 1a including a pipe 7 extending in the horizontal direction, a vertical pipe 15 suspended from the middle of the horizontal pipe 7, and a nozzle 6 provided in the vertical pipe 15. If it is this vertical type, it is possible to make the nozzle 6 dig deeply into the earth and sand 2a and make it into a slurry form.

  As Example 3 of the present invention, the direction of the injection port of the nozzle 6 in the liquefied injection pipe 7 is all set downward (in the case of Example 1), as shown in FIG. When all are installed toward the skirt part 3 of the sand removal pipe 4, there are a mixture of those installed downward and those installed toward the skirt part 3 of the sand removal pipe 4 although not shown. There are three ways of installation.

  By directing all of the injection ports of the nozzle 6 toward the skirt portion 3, the earth and sand 2a is in a state having a high slurry mud content, and is easily sucked into the sand discharge pipe 4, thereby improving energy efficiency. Also, if the nozzles 6 are mixed downward and upward, the nozzles 6 can be properly used depending on the sedimentation characteristics of the sediment 2a and the sediment properties such as viscosity, etc., and the sediment 2a is efficiently made into a slurry. be able to.

  In addition, the operation of the water intake pump 10 may be remotely controlled, or may be automatically operated. A water depth measuring device using ultrasonic waves may be installed on the dolphin superstructure 13 or the dolphin column pile 12 so as to constantly monitor the water depth in the vicinity of the dredging pump 1. It is also preferable to install the plurality of dredging pumps 1 with the dolphin superstructure 13 in the form of a pier.

  The fixed dam construction method according to the present invention can be applied not only to dam lakes but also to lakes and harbors.

1 Pump for firewood,
1a, 1b Dredging pump according to another embodiment 2 Dam lake, 2a Accumulated earth and sand,
3 Skirt,
4 Sand removal pipe,
5 High pressure water injection pipe, 5a Main nozzle,
5b Water supply vertical pipe,
6 nozzles,
7 Liquefaction injection pipe, 7a Water supply vertical pipe,
8 connecting members,
9 Dam dam body,
10 Water intake pump,
11 Lake bottom ground,
12 Dolphin pillar pile,
13 Dolphin superstructure,
14 waste sand connecting pipe, 14a floater,
15 Vertical pipe.

Claims (7)

A sand discharge pipe having a skirt portion at the bottom, a high-pressure water injection pipe for discharging driving water to the skirt portion and discharging sand from the sand discharge tube, and a nozzle disposed at the bottom of the sand discharge tube A dredging pump installed in the sediment deposited on the lake bottom ground, comprising a liquefied injection pipe for liquefying the sediment around the nozzle with liquefied water to be liquefied,
A water intake pump connected to the high pressure water injection pipe and the liquefaction injection pipe of the dredging pump to supply water from the dam lake;
One end is connected to the sand pumping pipe of the dredging pump and the other end is led to the dumping ground, and on the lake, the sand discharging pipe is supported by a floater,
A fixed dam kite system. The combination of the pipe and the nozzle in the liquefied jet pipe is such that the nozzle is provided in the pipe extending in the horizontal direction, the pipe extending in the horizontal direction, the vertical pipe suspended from the middle of the horizontal pipe, and the vertical That there is something consisting of a nozzle provided in the pipe,
The fixed dam dredging system according to claim 1. In the liquefied injection pipe, the nozzle outlets are all installed downward, all are installed toward the skirt part of the sand discharge pipe, and the skirt of the sand discharge pipe is installed downward. That it is installed together with what was installed towards the department,
The fixed dam dredging system according to claim 1 or 2. A sand discharge pipe having a skirt portion at the bottom, a high-pressure water injection pipe for discharging driving water to the skirt portion and discharging sand from the sand discharge tube, and a nozzle disposed at the bottom of the sand discharge tube Forming a dredge pump comprising a liquefied injection pipe for liquefying the earth and sand around the nozzle with liquefied water to be liquefied,
Fixing the dredging pump at a desired position in the lake, driving the dredging pump to discharge the sediment deposited on the bottom of the lake into a soil dump,
This is a fixed dam construction method. A sand discharge pipe having a skirt portion at a lower portion, a high pressure water injection pipe for injecting driving water to the skirt portion to discharge sand from the sand discharge tube, and a pipe disposed at a lower portion of the sand discharge tube. Forming a dredge pump comprising a liquefied spray pipe for liquefying the earth and sand around the nozzle with liquefied water sprayed from a nozzle provided in the pipe;
The dredging pump and the pump for taking water from the lake and supplying it to the dredging pump are supported from the bottom of the lake by the dolphin superstructure supported by the pillar pile of the dolphin and the dredging pump to the bottom of the lake Installed in the accumulated sediment,
One end is connected to the sand discharge pipe of the dredging pump and the other end is led from the lake surface to a predetermined soil disposal place.
The water intake pump is driven to inject high pressure water from the nozzle of the high pressure water injection pipe onto the skirt portion of the sand discharge pipe in the dredging pump, and liquefied water is accumulated on the lake bottom ground from the liquefaction injection pipe. Injecting into the earth and sand, making the earth and sand into a slurry form with the sand discharge connecting pipe from the sand discharge pipe of the dredging pump,
This is a fixed dam construction method. The combination of the pipe and the nozzle in the liquefied jet pipe is such that the nozzle is provided in the pipe extending in the horizontal direction, the pipe extending in the horizontal direction, the vertical pipe suspended from the middle of the horizontal pipe, and the vertical That there is something consisting of a nozzle provided in the pipe,
The fixed dam construction method according to claim 4 or 5. In the liquefied injection pipe, the nozzle outlets are all installed downward, all are installed toward the skirt part of the sand discharge pipe, and the skirt of the sand discharge pipe is installed downward. That it is installed together with what was installed towards the department,
The fixed dam construction method according to any one of claims 4 to 6.

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