JP4615756B2 - Rehabilitation pipe inspection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inspection port rehabilitation method for rehabilitating an inspection port provided in an existing pipe when lining the inner surface of the existing pipe buried underground with the rehabilitation pipe.
[0002]
[Prior art]
In general, aging existing pipes made of reinforced concrete pipes (fume pipes), steel pipes, etc. are inserted into the inside while sequentially connecting new resin pipes with a small diameter of a predetermined length, and laid rehabilitation pipes. Rehabilitation is performed by injecting a sealing material such as mortar or foamable resin material into the gap between the existing pipe and sealing it.
[0003]
Thus, when rehabilitating using a backfilling material, the inner diameter of the rehabilitation pipe is considerably smaller than the inner diameter of the existing pipe, and therefore there is a problem that the effective flow rate is reduced, Since it is necessary to lay the rehabilitation pipe while sequentially connecting the resin pipes or to inject the backfill material into the gap with the existing pipe and seal it, the workability is poor and the rehabilitation work cannot be performed quickly.
[0004]
From this point, for example, as disclosed in Japanese Patent Laid-Open No. 1-56531, the inner surface of an existing pipe such as a sewage pipe has a shape recovery property in a cylindrical shape at a shape recovery temperature made of a thermoplastic resin. There has been proposed one in which a pipe liner having a cross-sectional shape degenerated in a bowl shape is drawn in and restored to a circular shape by heat expansion so that the inner surface of an existing pipe is lined.
[0005]
[Problems to be solved by the invention]
By the way, since inspection ports such as manholes and masses that open existing pipes to the ground are also aged due to deterioration over the years, there is a demand for rehabilitation of inspection ports.
[0006]
In that case, it is conceivable to renovate by attaching a new manhole or mass to the inside of the inspection port made of a manhole or mass as in the case of rehabilitating the existing pipe with the rehabilitation pipe. However, in order to connect a new manhole or mass to the rehabilitated pipe that has rehabilitated the existing pipe, a joint is required, and there is a risk of water leakage to the rehabilitated pipe.
[0007]
In addition, since the rehabilitation work of the inspection port is performed before and after the rehabilitation work of the existing pipe by the rehabilitation pipe, the work efficiency is remarkably deteriorated.
[0008]
The present invention has been made in view of the above points, and the object of the present invention is to prevent water leakage to the rehabilitation pipe and efficiently rehabilitate the existing pipe and rehabilitate the inspection port at the same time. It is to provide an inspection port rehabilitation method for rehabilitation pipes.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is directed to a case where the inner surface of an existing pipe buried underground is lined with a rehabilitation pipe.
[0010]
Specifically, when the inner surface of an existing pipe buried underground is lined with a rehabilitated pipe, the three-branch pipe installation process and the rehabilitated pipe laying process are used as the inspection port rehabilitation method to rehabilitate the inspection port provided in the existing pipe. And a lining process and a drilling process. In the 3-branch pipe installation process, an inspection port is positioned in the middle of the existing pipe that is lined by the rehabilitation pipe, and an upper opening hole that opens upward and the upper opening hole are provided so as to correspond to the inspection port. A three-branch pipe having through holes penetrating in the direction toward both ends of the existing pipe is installed so as to communicate with both ends of the pipe. In the rehabilitation pipe laying process, the rehabilitation pipe introduced from one end side of the existing pipe is inserted into the through hole of the above-mentioned 3 branch pipe and led to the other end side of the existing pipe, and the rehabilitation pipe is laid in the existing pipe and the 3 branch pipe To do. In the lining process, steam is introduced into the rehabilitation pipe to heat the rehabilitation pipe, and then compressed air is fed into the rehabilitation pipe to pressurize and expand the rehabilitation pipe, so that the rehabilitation pipe is attached to the inner surface of the existing pipe and the 3-branch pipe. Line up closely. In the drilling step, a new inspection port is drilled from above at a position corresponding to the upper opening hole of the three branch pipe in the rehabilitation pipe.
[0011]
With this specific matter, a 3-branch pipe is installed at the inspection port in the middle of the existing pipe, and the rehabilitation pipe is inserted into the through-hole of the 3-branch pipe and laid on the inner surface of the existing pipe and the 3-branch pipe. After the pipes are brought into close contact with each other and lined, a new inspection port is drilled from above at a position corresponding to the upper opening hole of the three-branch pipe in the rehabilitation pipe. This eliminates the need for a joint required when a new manhole or mass is attached to the inside of an inspection port made of a manhole or mass to rehabilitate the inspection port, thereby preventing leakage of water to the rehabilitation pipe. In addition, the rehabilitation work of the inspection port and the rehabilitation work of the existing pipe by the rehabilitation pipe are performed at the same time without any change, and the rehabilitation work of the inspection port can be performed efficiently.
[0012]
In particular, the following configurations are listed as those that can more reliably prevent water leakage to the rehabilitation pipe.
[0013]
That is, after the rehabilitation pipe laying process is completed, a sealing process is provided for sealing the new inspection port of the rehabilitation pipe around the upper opening hole of the three branch pipe.
[0014]
With this specific matter, the new inspection port of the rehabilitation pipe is sealed against the periphery of the upper opening hole of the three-branch pipe, and water leakage to the rehabilitation pipe can be prevented more reliably.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0016]
FIG. 1 shows a rehabilitation pipe used in the inspection port rehabilitation method according to the present invention. The rehabilitation pipe 1 is made of a thermoplastic resin such as vinyl chloride or high-density polyethylene and extends along the longitudinal direction on the outer surface. It is deformed so as to have the recess 11 and is formed into a shape that is degenerated into a bowl shape with a reduced cross-sectional outer area. Further, the rehabilitation pipe 1 has a performance of recovering its shape to a cylindrical body by being heated to a predetermined shape recovery temperature (for example, 80 ° C.). In this case, the shape recovery temperature is a temperature at which the shape is recovered to a cylindrical shape only by heating without applying an external force such as pressure.
[0017]
The manufacturing method of this rehabilitation pipe | tube 1 is as follows. As shown in FIG. 2, first, a cylindrical body 10 of a thermoplastic resin material is extruded by an extruder 21, and the cylindrical body 10 is cooled by passing it through a cooling water tank 22. The outer surface is crushed in an atmosphere of a recovery temperature, and a recess 11 extending along the longitudinal direction is formed on the outer surface as shown in FIG. Thereafter, the cylindrical body 10 is pulled by the tensioning device 24 so that the cross-sectional outer area is reduced, and the cylindrical body 10 is wound on the drum 26 via the traverse portion 25.
[0018]
The rehabilitating pipe 1 manufactured in this way is restrained so that the pipe itself does not “recover naturally” under the influence of the outside air temperature until it is carried into the rehabilitation site of the existing pipe. It is preferable to constrain using or to store at low temperature.
[0019]
-Rehabilitation work-
Next, renovation work for existing pipes and inspection ports will be described.
[0020]
Here, as shown in FIG. 3, the existing pipe 3 buried between the upstream manhole Q1 (manhole located on the left side in FIG. 3) and the downstream manhole Q2 (manhole located on the right side in FIG. 3). The case of rehabilitation will be described. In this case, a single inspection port T is provided in the middle of the existing pipe 3 located between the upstream manhole Q1 and the downstream manhole Q2, and this inspection port T opens the existing pipe 3 to the ground. It is constituted by a mass M.
[0021]
In the rehabilitation work in this embodiment, the rehabilitation work of the existing pipe 3 by the rehabilitation pipe 1 and the renewal work of the inspection port T are performed simultaneously.
[0022]
The rehabilitation pipe 1 wound on the drum 26 is carried on the ground near the upstream manhole Q1. On the other hand, a winch 51 is disposed on the ground near the downstream manhole Q2. In addition, a guide portion 52 for guiding the wire 54 that pulls the rehabilitation pipe 1 is provided at the lower portion of the downstream manhole Q2. Prior to inserting the rehabilitation pipe 1 into the existing pipe 3, the inside of the existing pipe 3 is washed in advance and the protrusions are removed.
[0023]
First, as a three-branch pipe installation step, the three-branch pipe 4 made of a synthetic resin is installed at an intermediate position of the existing pipe 3 lined by the rehabilitation pipe 1. Specifically, the upper opening hole 41 that opens the three-branch pipe 4 is made to correspond to the inspection port T (mass M), and the upper opening hole 41 is connected to both ends of the existing pipe 3 (upstream manhole Q1). It is installed in the recess 31 provided on the lower surface of the existing pipe 3 so as to correspond to the through-holes 42 penetrating toward both ends of the existing pipe 3 so as to communicate with the side and downstream manhole Q2 side. In this case, the three-branch pipe 4 is formed in such a size that the inner diameter of the through hole 42 coincides with the inner diameter of the existing pipe 3, while the inner diameter of the upper opening hole 41 is the through hole 42 as shown in FIG. The through-hole 42 is made to match the existing pipe 3 when installed at the bottom of the existing pipe 3. Further, as shown in FIGS. 5 and 6, around the upper opening hole 41 of the three-branch pipe 4, the new inspection port 12 (described later) of the rehabilitated pipe 1 is sealed around the through hole 42. An annular rubber wheel 45 is provided.
[0024]
Next, as a rehabilitation pipe laying step, as shown in FIG. 3, the tip of the wire 54 led out from the winch 51 is upstream from the lower end of the downstream manhole Q2 through the existing pipe 3 and the communication hole 42 of the three branch pipe 4. Lead to the lower end of the side manhole Q1. Then, the drum 26 is rotated, and the tip of the rehabilitation pipe 1 is led out to the lower end of the upstream manhole Q1, that is, the upstream end of the existing pipe 3. In the upstream manhole Q 1, a tip tool 53 is attached to the tip of the rehabilitation pipe 1, and the tip of the wire 54 extending from the winch 51 is locked to the tip tool 53. Thereafter, with the tip of the rehabilitation pipe 1 fed out from the drum 26 being inserted into the existing pipe 3, the rehabilitation pipe 1 is pulled by winding the wire 54 with the winch 51, and the rehabilitation pipe 1 is removed from the existing pipe 3. Pull inside. By this operation, the rehabilitation pipe 1 is led from the upstream manhole Q1 side to the downstream manhole Q2 side through the through hole 42 of the three branch pipe 4, and the existing manhole Q1 and the downstream manhole Q2 are connected. Lay over the entire length in the tube 3. The arrangement state of the rehabilitated pipe 1 in the existing pipe 3 at this time is shown in FIG.
[0025]
Then, it progresses to a lining process. In this lining process, as shown in FIG. 8, a steam generator / pressurizer 55 is disposed on the ground near the upstream manhole Q1, and a water / steam separator 56 is disposed on the ground near the downstream manhole Q2. . An elbow 57 is connected to the rear end of the rehabilitation pipe 1, and a hose 55 a extending from the steam generator / pressurizer 55 is connected to the elbow 57, and a hose extending from the water / steam separator 56 to the tip 53 of the rehabilitation pipe 1. 56a is connected. A temperature sensor (not shown) is attached to the elbow 57 and the tip tool 53. In this state, steam is continuously supplied from the steam generator / pressurizer 55 into the rehabilitation pipe 1, and the rehabilitation pipe 1 is heated from its inside to the shape recovery temperature while flowing down to the water / steam separator 56. Then, the shape is restored to a substantially original cylindrical body. The state of the renovated pipe 1 in the existing pipe 3 at this time is shown in FIG.
[0026]
After restoring the shape of the rehabilitating pipe 1 to the cylindrical body in this way, the tip 53 is sealed, and compressed air is sent from the steam generator / pressurizer 55 to the inside of the rehabilitating pipe 1 as shown in FIG. In addition, the rehabilitated pipe 1 is pressurized and expanded from the inside thereof and is brought into close contact with the inner surface of the existing pipe 3 and the inner surface of the through hole 42 (the state of the rehabilitated pipe 1 in the existing pipe 3 at this time is shown in FIG. In this pressurized state, cooling and fixing are performed, and the lining operation for the inner surface of the existing pipe 3 is completed. At this time, the rubber ring 45 that wraps around the upper opening hole 41 of the three-branch pipe 4 in the vicinity of the through hole 42 ensures water-tightness around the upper opening hole 41 of the three-branch pipe 4 by the pressure expansion of the rehabilitation pipe 1. A sealing process is performed in which the new inspection port 12 (described later) of the rehabilitated pipe 1 is sealed by being pressed into a state where it can be performed.
[0027]
Then, as shown in FIG. 10, as a drilling process, a new drilling device provided with a processing tool such as an end mill (not shown) at a position corresponding to the upper opening hole 41 of the three-branch pipe 4 in the rehabilitation pipe 1 from above. The inspection port 12 is drilled. In this case, the lower end of a pipe K (indicated by a two-dot chain line in FIG. 10) extending in the vertical direction may be connected to the new inspection port 12 so as to fill the periphery of the pipe K.
[0028]
-Effect of the embodiment-
As described above, in the inspection port rehabilitation method for the rehabilitation pipe 1 in this embodiment, the three-branch pipe 4 is installed in the inspection port T in the middle of the existing pipe 3, and the rehabilitation pipe is placed in the through hole 42 of the three-branch pipe 4. In a state where 1 is inserted and laid, the rehabilitated pipe 1 is closely attached to the inner surfaces of the existing pipe 3 and the 3-branch pipe 4, and then the retinal pipe 1 corresponds to the upper opening hole 41 of the 3-branch pipe 4 If the new inspection port 12 is drilled from above, the renewal operation of the inspection port T is completed. For this reason, the joint required when attaching a new manhole and a mass inside the inspection port which consists of a manhole and a mass and renovating an inspection port becomes unnecessary. In addition, the new inspection port 12 of the rehabilitated pipe 1 is sealed by a rubber ring 45 that goes around the through hole 42 around the upper opening hole 41 of the three branch pipe 4. Thereby, the water leak with respect to the rehabilitation pipe | tube 1 can be prevented reliably.
[0029]
Moreover, the rubber ring 45 attached around the upper opening hole 41 of the three-branch pipe 4 around the through-hole 42 is watertight against the periphery of the upper opening hole 41 of the three-branch pipe 4 by the pressure expansion of the rehabilitation pipe 1. Since it is pressed into a state that can ensure the safety, there is no need to take troublesome work like applying a sealing material and sealing, and the sealing process is performed simultaneously by the pressure expansion of the rehabilitation pipe, simplifying the sealing process Can be achieved.
[0030]
Further, the rehabilitation work of the inspection port T and the rehabilitation work of the existing pipe 3 by the rehabilitation pipe 1 are performed simultaneously without going back and forth, and the rehabilitation work of the inspection port T can be performed efficiently.
[0031]
-Other embodiments-
In addition, this invention is not limited to the said embodiment, The other various modifications are included. For example, in the present embodiment, the sealing process by the rubber ring 45 attached around the upper opening hole 41 of the three branch pipe 4 can be performed simultaneously with the lining process by the pressure expansion of the renovated pipe 1 in the lining process. Immediately after the rehabilitation pipe laying process, a sealing process may be performed in which an adhesive is applied around the upper opening hole of the three-branch pipe, and sealing with the adhesive may be performed by pressurization and expansion of the rehabilitation pipe in the lining process.
[0032]
Further, in the present embodiment, the case where the single inspection port T made of the mass M positioned in the middle position of the existing pipe 3 between the upstream manhole Q1 and the downstream manhole Q2 is renewed has been described. Of course, the present invention can also be applied to the case where a plurality of inspection ports made up of masses and manholes are rehabilitated in the middle of the existing pipe between the manhole and the downstream manhole.
[0033]
【The invention's effect】
As described above, in the present invention, lining with a rehabilitation pipe is performed in a state where a 3-branch pipe is installed at an inspection port in the middle of an existing pipe and the rehabilitation pipe is inserted into the through-hole of the 3-branch pipe. In addition, if a new inspection port is drilled from the upper side at the location corresponding to the upper opening hole of the 3-branch pipe in the rehabilitation pipe, the inspection port can be rehabilitated to prevent leakage to the rehabilitation pipe without providing a joint. In addition, the rehabilitation work of the inspection port can be performed simultaneously with the rehabilitation work of the existing pipe by the rehabilitation pipe, so that the work efficiency can be improved.
[0034]
In particular, after the rehabilitation pipe laying process is completed, it is possible to more reliably prevent water leakage to the rehabilitation pipe by providing a sealing process for sealing the new inspection port of the rehabilitation pipe around the upper opening hole of the three branch pipe.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a rehabilitation pipe before rehabilitation work according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining a manufacturing process of a rehabilitation pipe.
FIG. 3 is a diagram for explaining an operation of drawing a rehabilitation pipe into an existing pipe.
FIG. 4 is a cross-sectional view of the vicinity of the upper opening when the three-branch pipe is viewed from the through hole direction.
FIG. 5 is a plan view of a three-branch pipe as viewed from above.
FIG. 6 is a partially cutaway cross-sectional view of a three-branch pipe as viewed from the side.
FIG. 7A is a cross-sectional view showing a state in which a rehabilitation pipe is drawn into the buried main pipe.
(B) is sectional drawing which shows the state which heated the rehabilitation pipe | tube and was made to recover shape.
(C) is sectional drawing which shows the state which pressure-expanded the rehabilitation pipe | tube, and was made to closely_contact | adhere to the inner surface of an embedding main pipe | tube.
FIG. 8 is a view for explaining the diameter expansion operation of the rehabilitation pipe.
FIG. 9 is a cross-sectional view showing a diameter expansion state of the rehabilitation pipe in the vicinity of the three branch pipe.
FIG. 10 is a cross-sectional view showing a state in which a new inspection port is opened in the vicinity of a three-branch pipe.
[Explanation of symbols]
1 Rehabilitation pipe 12 New inspection port 3 Existing pipe 4 3 branch pipe 41 Upper opening hole 42 Through hole T Inspection port

Claims (2)

An inspection port rehabilitation method for rehabilitating the inspection port provided in the existing pipe when lining the inner surface of the existing pipe buried underground with the rehabilitation pipe,
An inspection port is positioned in the middle of the existing pipe that is lined by the rehabilitation pipe, and the upper opening hole that opens upward and the upper opening hole are communicated with both ends of the existing pipe. A three-branch pipe installation step of installing a three-branch pipe having through holes penetrating toward both ends of the existing pipe so that
A rehabilitation pipe laying step in which a rehabilitation pipe introduced from one end side of the existing pipe is inserted into the through-hole of the three-branch pipe and led to the other end side of the existing pipe, and the rehabilitation pipe is laid in the existing pipe and the 3-branch pipe; ,
After introducing steam into the rehabilitation pipe and heating the rehabilitation pipe, supply the compressed air into the rehabilitation pipe and pressurize and expand the rehabilitation pipe to bring the rehabilitation pipe into close contact with the inner surface of the existing pipe and the 3-branch pipe Lining process,
An inspection port rehabilitation method for a rehabilitation pipe, comprising: a drilling step for drilling a new inspection opening from above at a position corresponding to the upper opening hole of the three branch pipe in the rehabilitation pipe. In the rehabilitation pipe inspection port rehabilitation method according to claim 1,
An inspection port rehabilitation method for a rehabilitation pipe, comprising a sealing step of sealing a new inspection opening of the rehabilitation pipe around the upper opening hole of the three branch pipe after completion of the rehabilitation pipe laying process.

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