Method for removing sediments under sewage water in a sewer

Details Method for removing sediments under sewage water in a sewer Method for removing sediments under sewage water in a sewer

1999-06-17

2001-01-30

Simmons, David A. (Department: 1724)

Liquid purification or separation

Processes

Including geographic feature

C210S767000

Reexamination Certificate

active

06180013

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method for removing sediments under sewage water in a sewer, more particularly to a sediment-removing method that can be carried out conveniently and quickly.
2. Description of the Related Art
In the past, with reference to
FIG. 1
, sediments
18
under sewage water
19
in a sewer
11
are removed by a digger
10
. Digging a number of large holes
14
(only one is shown in
FIG. 1
) in the ground or road
12
in order to permit access of the digger
10
into the sewer
11
is required before removing the sediments
18
. After the sediments
18
are dug out by the digger
10
from the sewer
11
through the large holes
14
, the large holes
14
on the road
12
must be closed in preparation for use by the vehicles.
Referring to
FIG. 2
, a steel plate
15
is disposed on top of support walls
13
that are provided between the sewer
11
and the road
12
. Then, a concrete layer
16
and an asphalt layer
17
are formed sequentially above the steel plate
15
in order to close a large hole
14
. It is noted that the conventional process for removing the sediments
18
from the sewer
11
is troublesome and time-consuming.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a method for removing sediments under sewage water in a sewer, which can be carried out conveniently and quickly.
According to the present invention, the method for removing sediments under sewage water in a sewer, comprises:
introducing a portion of a cable into a sewer from the ground by extending the cable into the sewer through an inlet in the ground accessible to the sewer and out of the sewer through an outlet in the ground communicated with the sewer;
lowering the portion of the cable until the portion of the cable is embedded in the sediments;
positioning two ends of the cable extending outwardly of the inlet and the outlet on the ground;
moving mechanically the cable to stir and suspend the sediments into the sewage water;
pumping the suspended sediments from the sewer to the ground through one of the inlet and the outlet;
removing the sediments from the sewage water by filtration on the ground; and
returning the sewage water to the sewer through the other one of the inlet and the outlet.


REFERENCES:
patent: 2711598 (1955-06-01), Craggs, Jr.
patent: 4279754 (1981-07-01), Pollock
patent: 4312762 (1982-01-01), Blackburn et al.
patent: 4724088 (1988-02-01), Zetterland
patent: 4818390 (1989-04-01), Manchak, Jr.
patent: 4957622 (1990-09-01), Mims
patent: 5250199 (1993-10-01), Haag
patent: 5460727 (1995-10-01), Davis

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