JP3547298B2 - Rehabilitation of sewer pipes during operation - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for rectifying a sewerage pipe in service, and more particularly to an improvement in a method for rectifying a sewerage pipe in which a new pipe is laid in a pipe while leaving an old sewage pipe unchanged.
[0002]
[Prior art]
When the aging sewage pipe is rehabilitated, a so-called pipe-in-pipe method of laying a new pipe in the pipe while keeping the aging sewage pipe unchanged is known.
[0003]
The above-mentioned construction method has an advantage that the excavation work becomes unnecessary because the aged sewer pipe is not removed, and the scale of the work can be very small.
In addition, since the aged pipeline fulfills the function of a shield tunnel of the rehabilitation pipeline, there is an advantage that the service life of the rehabilitation pipeline is favorable.
[0004]
[Problems to be solved by the invention]
However, when renewing the above aging pipeline, it is necessary to remove it from the construction site by bypassing the sewage flow until the process of carrying in the new pipe, connecting, and fixing by grout is completed, and the accompanying work will be extensive. There was a problem.
[0005]
In particular, in the case of a main sewer, there is a problem that the flow rate in the pipe is large, the laying of the bypass pipe becomes large, and the advantage of the pipe-in-pipe method is halved.
[0006]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a method of correcting a sewage pipe without providing a bypass pipe or the like even in a main sewage pipe while keeping sewage flowing down. It was done for the purpose of doing.
[0007]
[Means for Solving the Problems]
The method for rehabilitating an in-service sewage pipe according to the present invention includes removing the upper half of an in-service sewage pipe by a length enough to accommodate a single new pipe, and inserting the new pipe hydraulic pressure into the aging pipe from the removed portion. A jack is installed, and then the new pipe attached with a spacer that maintains the gap between the top of the inside of the old pipe and the top of the new pipe to match the slope of the renewal pipe installed inside the old pipe is removed. From the old pipe, and sequentially sent into the old pipe while being connected with the hydraulic jack, and after all new pipes are connected and sent, a tubular floating body longer than the entire length of the new pipe is inserted into the rehabilitation new pipe and the old pipe is inserted. The sewage flow is suppressed and overflowed on the downstream side of the sewage pipe, the new pipe is lifted by the buoyancy of the floating body, and is brought into contact with the top of the inner surface of the old pipe via the spacer. Seal the space between the outer surfaces of both ends and the inner surface of the deteriorated pipe to create a space between them It is characterized in that to inject cured grout.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described.
1 to 7 are sectional views showing an embodiment of the method of the present invention.
[0009]
In FIG. 1, reference numeral 1 denotes an aged sewage pipe in service, in which sewage W flows. When the old pipe 1 is rehabilitated, as shown in FIG. 1, the upper half 1A of the old pipe 1 is removed by a length enough to accommodate a single new pipe 2.
[0010]
The removed portion 1A is desirably the upper half of an old pipe adjacent to the manhole 1B in order to install the hydraulic jack 3 described later and secure a reaction force during driving.
Next, a hydraulic jack 3 for inserting the new pipe 2 is installed in the deteriorated pipe 1 from the removed portion. When the upper half of the deteriorated pipe 1 adjacent to the manhole 1B is removed as described above, the old pipe 1 is installed on the inner wall of the manhole 1B as shown in FIG.
[0011]
In FIG. 2, reference numeral 3A denotes a jack substrate, and 3B denotes a leg for supporting the jack substrate 3A on the inner wall of the manhole.
Next, as shown in FIG. 3, the new pipe 2 is fed into the deteriorated pipe 1.
[0012]
The new pipe 2 is a spacer that maintains a distance between the inner top of the old pipe 1 and the outer top of the new pipe 2 so as to match the gradient S (FIG. 5) of the renewal pipe 2A provided in the old pipe 1. The new pipe 2 is inserted into the deteriorated pipe 1 from the removed portion 1A, and is sequentially fed into the deteriorated pipe 1 while being connected by the hydraulic jack 3.
[0013]
As shown in FIG. 4, after connecting and feeding all the new pipes 2, a tubular floating body 5 longer than the entire length of the correction pipe 2A is inserted into the correction pipe 2A and expanded.
Next, as shown in FIG. 5, the removed part 1A of the aging sewer pipe is closed, the sewage W is suppressed by the baffle plate 6 or the like on the downstream side of the sewage pipe 1, and the sewage overflows into the aging sewer pipe 1, The new pipes 2... 2 are lifted by the buoyancy of the floating body 5 until the new pipes 2...
[0014]
At this time, the new pipes 2... 2 are arranged at a predetermined gradient S in the deteriorated pipe 2 by the spacers 4. Then, in this state, the space between the outer surfaces of both ends of the new pipe 2 and the inner surface of the deteriorated pipe 1 is sealed with a closing bag 7 or the like.
[0015]
Further, since the sewage W is not blocked by the baffle plate 6 or the like, but is not blocked, the sewage W continues to flow through the new pipes 2.
Next, as shown in FIG. 6, grout 9 made of high specific gravity air mortar or the like is injected into a space between the inner surface of the deteriorated pipe 1 and the outer surface of the new pipe 2 from an injection port 8 opened from the ground surface.
[0016]
The sewage W filled in the injection space is discharged from grout filling confirmation pipes 10 provided at both ends of the correction pipe 2A, and is sequentially replaced with grout.
Completion of the filling of the grout 9 is confirmed by leakage of grout from all the filling confirmation tubes 10... 10, and after confirmation, all the filling confirmation tubes 10.
[0017]
After the curing of the grout 9, the floating body 5 and the baffle plate 6 are removed as shown in FIG.
As described above, the line correction is completed with the new pipe 2 without completely blocking the sewage flow.
[0018]
【The invention's effect】
As described above, according to the method of the present invention, when the aging sewer pipe is rehabilitated by the pipe-in-pipe method, the construction can be performed without stopping the sewage flow, and the construction scale becomes very small.
[0019]
In addition, when lifting the incoming new pipe at a predetermined gradient and arranging it, it uses the buoyancy of the floating body in the sewage, so there is no need for equipment such as jacks and cranes, and construction is very easy and inexpensive. It becomes.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a starting step of the method of the present invention.
FIG. 2 is a plan view showing an attached state of an insertion hydraulic jack.
FIG. 3 is a cross-sectional view showing a new pipe carrying-in step.
FIG. 4 is a cross-sectional view showing a new pipe arrangement step.
FIG. 5 is a sectional view showing a new pipe grading step.
FIG. 6 is a sectional view showing a grout injection step.
FIG. 7 is a sectional view showing a completed state.
[Explanation of symbols]
1 Old sewage pipe in service 1A Upper half of old pipe 1B Manhole 2 New pipe 2A Renewal pipe 3 Hydraulic jack for insertion of new pipe 3A Jack board 3B Leg 4 for supporting jack board on inner wall of manhole 4 Spacer 5 Tubular Floating body 6 Baffle plate 7 Closing bag 8 Inlet 9 Grout 10 Grout filling confirmation pipe S Slope W Sewage

Claims (1)

Remove the upper half of the aging sewer pipe in service by the length of the single new pipe, install the hydraulic jack for inserting the new pipe into the old pipe from the removed part, and then install the renewal installed in the old pipe. A new pipe fitted with a spacer that keeps the gap between the top of the inner pipe of the old pipe and the top of the outer pipe of the new pipe so as to match the slope of the pipe is carried into the old pipe from the above-mentioned removed part, and is sequentially connected with the hydraulic jack. While the pipe is being fed into the aged pipe, and all the new pipes are connected and sent, a tubular floating body longer than the entire length of the new pipe is inserted into the rectified new pipe, and the sewage flow is suppressed on the downstream side of the aged drain pipe to overflow. Then, the new pipe is lifted by the buoyancy of the floating body and is brought into contact with the top of the inner surface of the old pipe via the spacer, and in this state, the gap between the outer surfaces at both ends of the new pipe and the inner face of the old pipe is sealed and The grout is injected and hardened in the space of Calibration method sewer pipe in service.

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