Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Reexamination Certificate
1999-02-03
2001-10-16
Shackelford, H. (Department: 3673)
Hydraulic and earth engineering
Drainage or irrigation
Porous or apertured pipe, flume, or tileway
C405S127000, C405S145000, C405S146000, C405S151000
Reexamination Certificate
active
06302621
ABSTRACT:
TECHNICAL FILED
The present invention relates to a segment for a water intake tunnel, and in particular to a segment which is used as a water intake pipe used for introducing seawater into a seawater treatment plant such as a plant for turning seawater into freshwater, and a power generation plant.
BACKGROUND OF THE ART
A plant for turning seawater into freshwater is constructed in the vicinity of a seashore in order to obtain drinking water on an island and a desert region where there is only a small amount of precipitation. Furthermore, seawater is, for example, prime water for a plant making salt. In this type of seawater treatment plant, it is necessary to introduce seawater into equipment for turning seawater into freshwater.
Furthermore, in a nuclear power generation plant, a great amount of cooling water is required. In a case where such a power generation plant is installed in the vicinity of a seashore, seawater is used for cooling, and seawater is introduced as in the abovementioned plant.
Therefore, conventionally, in such a seawater treatment plant and a power generation plant, seawater was taken in by a water intake structure shown in “FIG.
13
” to
FIGS. 13A and 13B
and FIG.
14
.
In the water intake structure illustrated in the same drawing, a water reservoir
1
is installed in the vicinity of a seashore, a water collecting portion
2
is installed on the sea bottom, and a water conveyance pipe
3
is used to connect the water reservoir
1
to the water collecting portion
2
, wherein seawater taken into the water reservoir
1
is pumped up by a pump
4
and is distributed to various kinds of facilities.
A number of water intake pipes
5
protruding toward both sides of the water conveyance pipe
3
are provided at the water collecting portion
2
. A number of through holes are provided on the respective water intake pipes
5
, and a synthetic resin net or unwoven cloth is wound on the outer circumference thereof in order to prevent earth and sand from invading.
In such a water intake structure, usually, a water conveyance pipe
3
is buried by a driving method or a dig-sink method.
However, in such a conventional burying method of a water conveyance pipe
3
, there existed the following shortcomings and problems in the technical aspects as described below.
That is, when burying a water conveyance pipe
3
by a driving method or a dig-sink method, various limitations in working exist, resulting from the surrounding vicinity of the place directly above the burying position of the water conveyance pipe
3
being exclusively occupied.
For example, in work carried out by the driving method in a sea, since seawater is to be shut out, this causes a hindrance in sea transportation and makes it necessary to guarantee fishery rights.
Therefore, the present inventors developed a method for constructing a water intake pipe by utilizing a shield tunnel in order to solve these shortcomings and problems. Since places directly above the water intake pipe are not exclusively occupied if a water intake pipe is constructed by a shield construction method, no problems such as ocean pollution, etc. will occur.
However, a segment used for a conventional shield construction method is, generally, constructed of a segment body
6
made of steel reinforced concrete as shown in
FIG. 14
, wherein a plurality of segment bodies
6
are circumferentially connected to each other and are assembled to be cylindrical, and the assembled cylindrical bodies are connected one after another in the lengthwise direction.
The respective segment bodies
6
are provided with back-filling pores
7
penetrated in the thickness direction thereof, into which a back-filling material is supplied, and the back-filling pores
7
are clogged by a detachable plug packing
8
.
The segment bodies
6
are connected to each other in the axial direction by bolts and nuts
10
with a packing put therebetween in a joint box
9
secured at the ends in the lengthwise axial direction, and a sealing material
11
and a caulking material
12
are caused to intervene between the end faces of the segment bodies
6
.
As the segments are assembled, the plug packing
8
is detached, and a back-filling material
13
is supplied through the back-filling pores
7
between the outer circumferential surface of the segment bodies
6
and the driven surface of the ground, wherein a secondary coating layer
14
is formed on the inner circumferential side of the segment bodies
6
.
With the segments thus constructed, external water is prevented from invading by causing the sealing material
11
to intervene, and supplying the back-filling material
13
into the backside, and internal water is thus prevented from leaking outside. Principally, such segments are constructed so that a water stop function is secured. Therefore, such segments do not have the feature of a water intake pipe for intake of seawater, and such types of segments could not be used for intake of water as they are.
The present invention was developed in view of such shortcomings and problems, and it is therefore an object of the invention to provide a segment for a water intake tunnel having a feature suitable for intake of water.
DISCLOSURE OF THE INVENTION
The invention provides a segment for a water intake tunnel, which is cylindrically assembled on the interior side of the surface driven by a shield driving machine, which includes segment units which are obtained by dividing a cylindrical body of an appointed length into a plurality along the circumferential direction, wherein the abovementioned segment units are provided with a plurality of water intake pores communicatable with the outside, and clogging members detachably attached to the respective water intake pores.
In the segments thus constructed, by removing a clogging member attached to a water intake pore, the water intake pore is caused to communicate with the outside and seawater can be taken in through the water intake pore.
The abovementioned water intake pore can be covered with a filtering layer on its outside.
According to this construction, since the outside of the water intake pore is covered with a filtering layer, it is possible to prevent sand and other foreign matter from invading.
The abovementioned segment unit has a segment body constructed of steel plate or cast iron plate and the abovementioned filtering layer secured on the outer circumferential surface of the segment body, wherein it is possible to construct the abovementioned filtering layer of a porous material such as a communicatable foaming material, a porous concrete, etc.
According to the construction, the segment can be made lighter than that made of steel-reinforced concrete.
Furthermore, the invention provides a segment for a water intake tunnel, which is cylindrically assembled on the interior side of the surface driven by a shield driving machine, which includes segment units which are obtained by dividing a cylindrical body of an appointed length into a plurality along the circumferential direction, wherein the abovementioned segment units are provided with a number of water intake pores penetrated in the thickness direction thereof, and clogging members detachably attached to the respective water intake pores.
In the segments thus constructed, by removing the clogging members attached to the water intake pores, the water intake pores are made open to the outside, and seawater can be taken in through the open water intake pores.
In this case, a greater number of water intake pores are set than the number of conventional back-filling pores. By making the number of water intake pores greater than that of the back-filling pores, the segments thus constructed can become suitable as a water intake pipe.
The abovementioned water intake pores are covered with a filtering layer on their outer surface, and a porous material such as a continuous foaming material and a porous concrete, etc., can be filled up in the abovementioned water intake pores.
According to the construction, since the water intake pores are covered with a filter
Miya Kiyoshi
Tanaka Yoshihiro
Cole Thomas W.
Hartmann Gary S.
Nixon & Peabody LLP
Obayashi Corporation
Shackelford H.
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