JP3547725B2 - Method of specifying pipe connection position, and method of restoring non-cutting service pipes when updating underground sewers - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for specifying a connection position of a pipe, and in particular, renews an existing sewer such as an aged sewer without excavation, and restores and rehabilits a service pipe connected to the existing sewer without excavation. In this regard, the present invention relates to a service pipe non-digging restoration method capable of easily and inexpensively specifying a connection position of a service pipe from inside a newly installed sewer.
[0002]
[Prior art]
In recent years, particularly in urban areas, the development of lifelines, including sewerage services, has been progressing. However, on the other hand, the deterioration of the sewer laid in the past and the lack of the sewer ability are becoming a problem, and replacement of the laid sewer is desired.
[0003]
When replacing the laying, it is easiest to construct the new culvert by an open-cutting method while keeping the existing culvert as it is, while keeping the route separate, and the construction is the easiest and the cost is low. However, in urban areas, it has become difficult to secure land for laying new sewers, there are problems with securing road traffic, and problems with underground buried objects that are complicated in the underground space. However, it is becoming difficult to secure a route for a new sewer.
[0004]
While solving these problems at once, the method of laying a new sewer was thought to be the refresh shield method, pipe bursting method, pipe eating method, etc. It is an update method. According to this method, the existing sewer is cut and crushed by an excavator, etc., and the new sewer is followed from the back of the sewer. A new pipe with the same diameter will be laid.
[0005]
As shown in FIG. 13, the refresh shield method uses an existing pipe by a shield excavator 50 having a cutter head 51 having an opening in the center and a direction control support device (guide device) 52 provided in a hollow portion thereof. A new pipe 53 is laid behind the shield machine 50 while cutting and excavating the culvert 54 and surrounding ground. In this case, the excavating power of the shield excavator 50 is given through the newly installed sewer 53 by a main push jack (not shown) placed at the base end (vertical shaft) of the newly installed sewer 53. In addition, by flowing downflow water such as sewage through a pipe provided through the center of the cutter head 51, it is possible to perform hot-line construction while using a current culvert. Excavation waste is carried outside the mine through the belt conveyor 55 and the like.
[0006]
The pipe bursting method is a method of forcibly expanding an old pipe from the inside to create a space, and inserting a renewal pipe therein. The pipe eating method is a method of crushing an old pipe while crushing the old pipe. It is a method of taking in the inside and inserting a renewal pipe into the hollow part behind the excavator.
[0007]
However, in the conventional renewal method of culverts by non-cutting, when cutting and removing existing culverts, the connection end portions of service pipes connected to the existing culverts are damaged irregularly, and after that, new construction is performed. Due to problems such as poor connection to the sewer or damage not only to the connection to the main sewer but also cracks along the longitudinal direction of the pipe, the main pipe was updated without cutting. However, service pipes are currently being replaced by excavation work. Even if the main pipe is renewed without excavation, excavation is performed for each of the many connected service pipes, which naturally lowers the construction efficiency, and the merit of performing the main pipe without excavation This has led to a lack of demand despite the many proposed methods of rehabilitating sewers by non-drilling. In addition, due to the excavation work for replacing the service pipe, road traffic regulations are required, and there are also problems in the surrounding environment such as construction noise.
[0008]
In order to solve these problems, the present applicants have proposed a method of restoring a service pipe at the time of renewal of a buried underground conduit described in Japanese Patent Application Laid-Open Nos. Hei 10-231955 and 2000-257141. Suggested.
[0009]
In these prior arts, the service pipe is filled with filling material or a pipe-shaped temporary lining is formed in close contact with the service pipe, and the existing pipe is cut and removed while the service pipe is reinforced without cutting. A new sewer is laid at the site and the sewer is renewed. After that, after forming a hole communicating with the service pipe in the new sewer, lining is performed at least over the area spanning the new sewer and the service pipe. And integrate the newly installed sewer with the service pipe.
[0010]
However, in order to form a communication hole to the service pipe with respect to the inner wall of the newly installed new pipe, it is necessary to first clarify the connection position of the service pipe in the new pipe. Therefore, in the above prior art,
(B) A marking hole is drilled in the service pipe connection area of the new pipe with a drill inserted from the service pipe side, and thereafter, a worker or an in-pipe robot uses the marking hole from the new pipe side as a reference. A method of forming a communication hole having substantially the same diameter as the inside diameter of the service pipe at the service pipe connection site in the newly installed sewer,
(B) A method for performing drilling marking with ultra-high pressure water,
(C) a method of inserting a high-frequency transmitter into a service pipe while searching for a high-frequency signal transmitted from the high-frequency transmitter in a newly installed sewer to specify a position;
(D) A method of specifying the connection position of the service pipe using a magnet and a magnetic sensor or iron powder,
Suggested.
[0011]
[Problems to be solved by the invention]
However, these methods (a) to (d) have a drawback that a complicated operation is basically required.
[0012]
In particular, in the method using the drill described in (a) above, it is difficult to strongly press the drill against the outer surface of the new sewer, and in general, the pipe axis of the service pipe is not orthogonal to the pipe axis of the new sewer, and It was found that drilling the marking holes was difficult because the drill blade was slippery because it was inclined toward the downstream side.
[0013]
On the other hand, although the above methods (b) to (d) are effective, there is a problem that the cost increases.
[0014]
Accordingly, a main object of the present invention is to provide a method capable of easily and inexpensively specifying a connection position of a pipe.
[0015]
[Means for Solving the Problems]
The present invention that has solved the above problems is as described below.
<Invention according to claim 1>
A method of specifying a connection position of a second pipe from inside the first pipe in a state where an opening at one end of the second pipe is connected to an outer surface of the first pipe,
The wall of the first tube at the connection position of the second tube is cooled or heated from the inside of the second tube, and a temperature difference is generated between the cooled or heated wall and a peripheral portion thereof. Or specifying the connection position from inside the first pipe based on a change in appearance of the inner surface of the first pipe caused by this temperature difference,
A method for specifying a connection position of a pipe, characterized in that:
[0016]
(Effect)
When the wall portion of the first tube at the connection position of the second tube is cooled or heated from inside the second tube, a temperature difference is generated between the cooled or heated wall portion and a peripheral portion thereof. The present invention uses the temperature difference to specify the connection position from within the first pipe. More specifically, since the temperature difference itself can be detected by a temperature measuring means such as a temperature sensor or an infrared camera, the connection position can be specified. Also, for example, if there is a liquid component in the first pipe or if the liquid component is supplied, the frost of the shape corresponding to the connection area of the second pipe is formed on the inner surface of the wall of the cooled or heated first pipe. Adhesion, evaporation of liquid, and the like occur, and no frost adheres to the surrounding area. As a result, the appearance change of the shape corresponding to the connection region of the second tube only in a portion corresponding to the second tube connection position on the inner surface of the first tube, in this case, a color change due to frost adhesion or the like occurs. The connection position can be specified based on this.
[0017]
As described above, according to the present invention, a temperature difference is created between the connection position and the surrounding area, and only by detecting the temperature difference, even if the second pipe is not visible from inside the first pipe, an expensive device or the like is used. If not, the connection position of the pipe can be easily specified. As a method of creating a temperature difference, a method of supplying a cooling fluid such as liquefied gas or a heating fluid such as steam, hot water or hot air into the second pipe is preferable because it is extremely easy and inexpensive. Heating can also be performed using a heating resistor.
[0018]
<Invention according to claim 2>
After cutting and removing the existing sewer without cutting and laying a new sewer at the removal site and updating the sewer, a hole communicating with the service pipe is formed in the new sewer and at least the new A lining is formed over the area spanning the sewer and the service pipe, and the new sewer and the service pipe are integrated.The existing sewer buried underground is not cut into the new sewer. A non-drilling restoration method of a service pipe applied when updating,
After laying the new sewer, before forming a hole communicating with the service pipe in the new sewer, cooling or heating the wall portion at the connection position with the service pipe in the new sewer from the service pipe. A temperature difference is generated between the cooled or heated wall portion and its surrounding portion, and the service pipe is drawn from inside the new conduit based on the temperature difference itself or a change in the appearance of the inner surface of the new conduit caused by the temperature difference. Identify the connection location of
Thereafter, forming a hole communicating with the service pipe from within the newly installed sewer at the specified connection position,
A method of restoring service pipes at the time of renewal of underground sewers, which is characterized in that:
[0019]
(Effect)
According to a second aspect of the present invention, there is provided the pipe connection position specifying method according to the first aspect, wherein the service pipe connection position is specified from the inside of the new pipe in the restoration of the service pipe when the underground burial is renewed. A temperature difference is created between the connection position of the service pipe in the new pipe and the surrounding area, and by detecting this, the connection position of the service pipe can be easily specified from within the new pipe. Is what you can do.
[0020]
In particular, such sewers are rich in moisture. Specifically, in a normal case, the inner surface of the newly installed sewer is wet or the atmosphere in the sewer contains moisture. Therefore, on the inner surface of the cooled or heated part of the newly installed conduit, frost and moisture evaporate in a shape corresponding to the connection area of the service pipe, and the appearance change phenomenon that frost does not adhere to the surrounding area occurs. appear. Therefore, even if the temperature difference itself is not detected by a temperature measuring means such as a temperature sensor or an infrared camera (this may be performed in the invention according to claim 2), the color difference due to the adhesion of frost or the like may occur. The connection position can be easily specified.
[0021]
<Invention of Claim 3>
The method for restoring non-cutting of a service pipe at the time of renewal of an underground conduit, according to claim 2, wherein the heating or cooling is performed by supplying a heating fluid or a cooling fluid into the service pipe.
[0022]
(Effect)
As a method of creating a temperature difference, a method of supplying a cooling fluid such as a liquefied gas or a heating fluid such as steam, hot water or hot air into the service pipe is preferable because it is extremely easy and inexpensive.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
A service pipe 2 shown in FIG. 1 in which a plurality of pipes 2a, 2a,... The method of the present invention will be described in detail while following the construction procedure, taking as an example the case of performing non-cutting restoration of a service pipe by the method disclosed in JP-A-2000-257141.
[0024]
<< First step: Service pipe reinforcement process >>
First, prior to the removal of the existing sewer 1 without cutting, the service pipe that may be damaged by the removal of the cutting is reinforced. As described in Japanese Patent Application Laid-Open No. 10-231955, this reinforcement is provided at least in a portion of the service pipe 2 near the existing sewer 1 by using a self-hardening resin such as foamed resin such as styrene foam, foamed styrene, mortar, concrete, and ground improvement material. A filling material such as a material may be filled, but preferably, as shown in FIG. 3, a temporary lining material in the form of a pipe is lined in the entire service pipe 2 to integrate the individual pipes 2a, 2a,. .
[0025]
As a specific method of the temporary lining, a known method called a so-called ICP (Inversion Chemical Pipe) liner & brease method or an INS method can be suitably adopted.
[0026]
These construction methods involve impregnating a thermosetting resin such as unsaturated polyester into a pipe-shaped bag formed of a nonwoven fabric, felt, or a laminate of these and a plastic film (hereinafter, referred to as a lining material). The lining material is inverted by fluid pressure such as water pressure or air pressure, and then heat is applied to the lining material to cure the thermosetting resin impregnated in the lining material. This is a method of constructing a lining body that is in close contact with the inner wall. However, since the main lining described later is performed over this temporary lining, it is not preferable that the lining material in the temporary lining (hereinafter, referred to as the temporary lining material) is too thick. However, if the thickness is too small, it is not possible to prevent the service pipe 2 from being damaged in the update process described later. According to experiments by the present inventors, the thickness of the temporary lining material is preferably set to 1 to 3 mm.
[0027]
More specifically, first, as shown in FIG. 2, the base end portion 20a of the temporary lining material 20 is folded back, and the folded portion 20a is fixed to the outside of the housing ground side entrance 2b of the service pipe 2 while the folded portion 20a is fixed. Pressure is applied to the gap s1 between the inner surface and the outer surface of the unfolded portion 20b by air supply or water injection. With this pressure, the temporary lining material 20 is inserted into the service pipe 2 while being turned upside down while sequentially feeding out and turning back the unfolded portion 20b. At this time, in order to prevent the temporary lining material 20 from being randomly inserted, the reversing rope 21 is connected to the distal end portion 20c of the temporary lining material 20 and by controlling the feeding of the reversing rope 21, Preferably, the reverse insertion of the lining material 20 is controlled.
[0028]
As shown in FIG. 3, when the temporary lining material 20 is completely inverted and inserted into the existing sewer 1, hot water or high-temperature steam is injected into the lining material 20 with the inverted rope 21 fixed. Thus, the temporary lining material 20 is cured. In this way, a cylindrical lining body that is in close contact with the inner surface of the service pipe 2 is formed. As shown in FIG. 4, the cured temporary lining material 20 is cut outside the service pipe inlet portion 2b, and the temporary lining operation is completed. In addition, although it is preferable to perform this reverse insertion of the temporary lining material 20 from the residential land basin side as shown in the illustrated example, it may be performed from the existing sewer 1 side. In the latter case, it is performed in the same manner as the main lining described later.
[0029]
<< Second step: Installation process of waterproof packer >>
Next, in the third step described below, in performing the cutting renewal of the existing sewer 1, in order to prevent the muddy water pressure of the cutter face plate portion of the cutting renewal machine from deviating into the service pipe 2, FIG. As shown in the figure, it is desirable to close a portion of the service pipe 2 in the vicinity of the existing sewer 1 with a waterproof packer 4 such as an air packer or rubber packer. In addition, it is recommended that the water stop packer 4 is inserted into the service pipe 2 from the residential land yard 3 side and installed.
[0030]
<< Third Step: Cutting and Removal of Existing Sewer and Renewal Process >>
As described above, at the stage where the pre-processing for the service pipe 2 is completed, the cutting and removing and updating of the deteriorated existing pipe 1 are performed.
[0031]
As a digging device used for cutting and removing and renewing the existing sewer 1, an existing one can be used as it is. For example, one of the present applicants has disclosed in Japanese Patent Application Laid-Open No. 09-88046 that the construction is easy, the excavation efficiency is excellent, and the cutting and excavation resistance is reduced. It has been proposed that a digging device which can easily dig in regardless of the kind of foreign matter existing around the existing sewer can be used. The excavating device proposed in Japanese Patent Application Laid-Open No. 10-266778 by the present applicant can also be used.
[0032]
As shown in FIG. 5, the newly installed sewer 10 is one or two sizes larger (or the same diameter) as the existing sewer 1 and is laid at substantially the same position as the existing sewer 1. At this time, the tip of the service pipe 2 is also slightly cut. However, if the above-described reinforcement is performed, the damage to the service pipe 2 and the drawing into the excavation hole are effectively prevented. In the illustrated example, the new conduit 10 is laid so as to be coaxial with the existing conduit 1, that is, the core is located at the same position. However, for example, the new conduit 10 is laid so that the pipe bottom and the top are located at the same position. You can also. When the new sewer 10 is laid, the packer 4 in the service pipe 2 is removed.
[0033]
<< Fourth step; Ground improvement process >>
As a matter of course, at the stage where the removal and renewal of the existing sewer 1 have been completed, the newly installed sewer 10 and the tip 2d of the service pipe 2 after cutting are not connected as shown in FIG. That is, at the time of renewal, the excavation is performed by a cutter face plate having a diameter slightly larger than that of the new sewer 10 for laying the new sewer, and the cutting tip 2d of the service pipe 2 is also cut and zigzag (not shown). ), A gap s2 is formed between the outer surface of the new sewer 10 and the service pipe tip 2d. Therefore, if the ground in the vicinity of the construction site is soft as it is, groundwater may enter the tip 2d of the service pipe 2 through the gap s2 or the ground exposed from the gap s2 may form the service pipe 2 There is a risk of falling inside. In particular, if a communication hole for the service pipe 2 is formed in the new sewer 10 as described below, following the installation of the new sewer, the ground accompanying the perforation is likely to collapse due to the vibration caused by the perforation. Groundwater and collapsed ground soil enter the newly installed sewer 10 via s2.
[0034]
Therefore, at least prior to the connection restoration work described later, preferably immediately after laying a new pipe, in order to prevent groundwater intrusion from around the service pipe 2 and to prevent ground collapse near the service pipe 2, FIG. As shown in the figure, it is desirable that the ground near the tip of the service pipe 2 outside the new pipe 10 be ground-modified to form the ground improvement body 9.
[0035]
On the other hand, there are no restrictions on the soil improvement method, but it is important to use a soil improvement method and soil improvement material, as well as a construction method that has little effect on the surrounding environment because there are often private houses etc. It is preferable to select a ground improvement material. This point is as described in the above-mentioned Japanese Patent Application Laid-Open No. 10-231955.
[0036]
However, since the conventional ground improvement method only has to be carried out from the ground, the positioning accuracy of the improved position is low and the traffic obstacle and the noise problem cannot be solved.
[0037]
Therefore, when the ground improvement is performed, as shown in Japanese Patent Application Laid-Open No. 2000-257141, the ground improvement agent G is supplied through the service pipe 2 into the tip of the service pipe 2, and the supply improvement agent G is supplied to the newly installed pipe. It is recommended that the ground be improved by permeating the ground near the service pipe tip 2d outside the new pipe 10 through a gap s2 between the outer surface of the culvert 10 and the service pipe tip surface.
[0038]
Specifically, as shown in FIGS. 6 to 8, the ground improving agent G is filled in the distal end portion 40 c of the flexible sheath 40, and the base end 40 a of the sheath 40 is turned back. Is fixed to the outside of the housing ground side entrance 2b of the service pipe 2, pressure is applied to the gap s3 between the inner surface of the folded portion 40a and the outer surface of the unfolded portion 40b by water injection or the like, and the sheath body 40 is inverted and inserted. Thus, a method of supplying the ground improvement agent G into the service pipe 2 tip is proposed. The method of the reverse insertion is the same as that of the above-mentioned temporary lining, so that the explanation is omitted here. However, the entire length of the sheath 40 (the length from the distal end of the sheath to the fixing portion outside the service pipe, not including the later-described inversion rope 41) passes through the service pipe 2 from the above-described sheath fixing portion and passes through the service pipe. 2 to the outer surface of the newly installed sewer 10 facing the tip 2d.
[0039]
During the reverse insertion, the sheath body distal end portion 40c finally passes through the pressure applying portion of the sheath body proximal end portion 40b, and as a result, the inner pressure (indicated by an arrow in the drawing) applied to the gap s3 as shown in FIG. The inlet portion is kept in a closed airtight bag shape, and is inserted into the service pipe 2 while wrapping and holding the soil improving agent G inside so as not to be released. At this time, a reversing rope 41 is connected to the outer surface of the distal end of the sheath body 40 in the same manner as the above-mentioned temporary lining, and the insertion of the sheath body is controlled by the reversing rope 41.
[0040]
As described above, since the entire length of the sheath body is equal to the distance from the sheath body fixing portion through the service pipe 2 to the outer surface of the newly installed sewer 10 where the tip 2d of the service pipe 2 faces, as shown in FIG. The sheath body tip portion 40c reaches the outer surface of the newly installed sewer 10. At this time, by raising the reverse insertion pressure of the sheath, the tip of the sheath is reversed and the improving agent G starts to be released. Further, by completely reversing the sheath body 40, the tip end surface of the sheath body closely adheres to the outer surface of the new conduit 10, and the reverse insertion pressure acts on the release improver G. As a result, the release improver G is released from the aforementioned new conduit 10. Through the gap s2 between the outer surface and the tip of the service pipe 2, it is forcibly penetrated into the ground near the tip of the service pipe 2 outside the new pipe 10, and between the service pipe 2 and the outer face of the new pipe 10. Almost no modifier G remains. The advantage of this forced osmosis is that even if the reverse insertion pressure is increased, no further pressure is applied to the improver once the retained amount of the improver has penetrated. Therefore, only the vicinity of the tip 2d of the service pipe 2 can be satisfactorily improved without disturbing the surrounding ground.
[0041]
Thus, the ground at the permeation site is hardened by the hardening of the penetration improver, and the improved body 9 is formed. The sheath body 40 is pulled out by pulling the inverted rope 41 after the release of the modifier G.
[0042]
<< Fifth step: Connection restoration process >>
After the ground improvement is completed, the new pipe 10 and the service pipe 2 are connected to each other to restore the connection.
[0043]
In this restoration work, finally, a communication hole having the same diameter as the inside diameter of the service pipe 2 is formed at a position corresponding to the service pipe 2 of the newly installed sewer 10. The connection position needs to be clear.
[0044]
For this reason, in the present invention, the wall at the connection position of the service pipe 2 in the newly installed sewer 10 is cooled or heated from within the service pipe 2, and a temperature difference is generated between the cooled or heated wall and the surrounding area, Using this temperature difference, the connection position of the service pipe 2 is specified from inside the newly installed sewer 10.
[0045]
As a method for cooling or heating the wall of the newly installed conduit 10, as shown in FIGS. 9 and 10, a cooling fluid such as liquefied gas (reference LG), ice water, steam, hot water (reference HW), hot air, etc. The method of supplying the heating fluid from the housing pipe side entrance 2b of the service pipe 2 into the pipe 2 and directly or indirectly contacting the wall of the newly installed sewer 10 is preferable because it is extremely easy and inexpensive. However, in the present invention, heating can be performed by inserting a heating resistor such as a nichrome wire into the tip of the service pipe 2 (not shown).
[0046]
Particularly efficient is the cooling of the connecting wall with a liquefied gas such as liquefied nitrogen. A heating fluid such as hot water is also preferable, but it is difficult to raise the temperature extremely, so that efficient heating is difficult.
[0047]
In addition, when these fluids are used, since the newly installed conduit 10 generally has poor heat conductivity, a large amount of fluid is used to generate a temperature difference on the wall of the newly installed conduit 10. Therefore, when such a fluid is used, it is preferable to continuously or intermittently replenish the supply in the service pipe 2 or to replace (including circulation use) the supplied fluid.
[0048]
Specifically, when the liquefied gas is used, the liquefied gas LG is vaporized and reduced in accordance with the cooling of the newly installed conduit 10, and the liquefied gas LG is continuously or intermittently supplied from the liquefied gas storage tank 11A as shown in FIG. It is desirable to refill the distal end of the tube 2. In the drawing, reference numeral 11B denotes a liquefied gas supply pipe whose base end is connected to the liquefied gas storage tank 11A and whose distal end is inserted into the distal end of the service pipe 2, and reference numeral 11C denotes the supply and stop of the liquefied gas LG. Figure 3 shows a valve to do so.
[0049]
On the other hand, when a liquid such as hot water or ice water is used, a replenishment supply form similar to that shown in FIG. 9 can be employed. However, although such a liquid has a reduced cooling or heating ability with time, it does not decrease its weight. As shown in (1), the used fluid is pumped out of the service pipe 2 by the return pump 12D, and hot water, ice water or the used water that has been separately pumped is heated or cooled again and supplied into the service pipe 2. You can also. In addition, the code | symbol 12A in FIG. 10 shows the storage tank of hot water etc., The code | symbol 12B shows the supply pipe of hot water etc. which the base end was connected to the storage tank 12A, and the front end side was inserted in the front-end | tip part of the service pipe 2, and Reference numeral 12C indicates a return pipe for returning the hot water or the like having the distal end inserted into the distal end portion of the service pipe 2, and reference numeral 12E indicates a cooling or heating means for the used water.
[0050]
When a heating liquid such as hot water is used, a heating device such as a heater may be immersed in the liquid HW of the service pipe 2 to keep the heating liquid in the service pipe 2 at a high temperature. (Not shown).
[0051]
Thus, when cooling or heating is performed to cause a temperature difference between the wall portion of the new conduit 10 at the connecting position of the service pipe 2 and the surrounding portion, usually, the inner surface of the new conduit 10 is wet or the inside of the conduit is wet. Since moisture is contained in the atmosphere, as shown in FIG. 9 and FIG. 1, frost of a shape corresponding to the connection area of the service pipe 2 is formed on the inner surface of the wall of the newly installed culvert 10 that has been cooled or heated. An appearance change VR such as adhesion or evaporation of moisture occurs, and a phenomenon occurs in which frost does not adhere to the surrounding portion. As a result, the connection position is marked in a shape corresponding to the connection region of the service pipe 2 by the color change VR due to the adhesion of frost or the like, that is, a shape in which the connection center portion can be recognized.
[0052]
Then, when the connection site is marked VR, a communication hole for the service pipe 2 is opened in the newly installed sewer 10. When the inner diameter of the newly installed sewer 10 is 800 mm or more, a worker may directly enter the inside of the pipe and perform drilling and finishing of the pipe wall using a hammer drill or the like by manual power. Is less than 800 mm, it is difficult for a worker to enter. Therefore, as shown in FIG. 11, an in-pipe TV camera 18a is provided, and at least swing along the pipe cross section and expansion and contraction in the pipe radial direction are performed. The center of the circular cutter 18c is aligned with the center of the appearance change marking VR (corresponding to the center of the connection part of the service pipe) by using the in-pipe drilling robot 18 having the circular cutter 18c at the tip of the possible telescopic arm 18b. Drill holes to form communication holes (not shown) for the service pipe 2.
[0053]
On the other hand, when a temperature difference is generated by heating, if the inner surface of the new pipe 10 is not wet, the above-described appearance change phenomenon does not occur or occurs, but the connection position may not be specified. The inside of the newly constructed conduit 10 may be artificially moistened before or after the installation. When frost is attached by cooling, even if the inner surface of the new sewer 10 is not wet (usually, it is often wet), the frost adheres to the moisture in the air in the new sewer 10. Therefore, it is not necessary to moisten the inside of the newly constructed sewer 10 (of course, it can be moistened).
[0054]
Further, the temperature difference itself of the wall portion at the connection position of the service pipe 2 can be detected by a temperature measuring means such as a temperature sensor or an infrared camera to specify the connection position of the service pipe. These temperature difference detecting devices such as infrared cameras can be mounted on the in-pipe drilling robot 18 instead of or together with the in-pipe TV camera 18a.
[0055]
《Sixth step; main lining》
If the new sewer 10 and the service pipe 2 can be communicated by the fifth step, finally, the temporary lining material 20 is overlapped with the new sewer 10 and the service pipe 2 in a range over the new sewer 10 and the service pipe 2. The temporary lining material 20 and the main lining material 30 are integrated by installing the main lining material 30, and the new culvert 10 and the service pipe 2 are integrated.
[0056]
Similar to the above-mentioned temporary lining, a known method called an ICP (Inversion Chemical Pipe) liner & brease method or an INS method can be suitably used for this lining. However, if the lining material is inverted and inserted from the side of the housing lot as in the case of the temporary lining, it is difficult to integrate the new culvert 11 and the service pipe 2.
[0057]
That is, as shown in FIG. 12, the lining work is performed using the in-pipe lining robot 19 including the frame device 19a that supports the brim 31 of the lining material and the in-pipe camera 19b that photographs the fixed portion.
[0058]
With the collar 31 of the folded portion 30a of the present lining material fixedly supported around the connection port of the service pipe 2 in the newly constructed conduit 10, the gap s4 between the inner surface of the folded portion 30a and the outer surface of the unfolded portion 30b is Pressure is applied by air supply or water injection. By this pressure, the lining material 30 is inserted into the service pipe 2 while being turned upside down while sequentially feeding out and turning back the unfolded portion 30b. These series of operations are monitored by the in-pipe traveling camera 19b.
[0059]
Other points are basically the same as the above-mentioned temporary lining. That is, in order to prevent the main lining material 30 from being randomly inserted during the reverse insertion, the reverse rope 32 is connected to the distal end portion 30c of the main lining material 30, and the feeding of the reverse rope 32 is controlled. Thereby, it is preferable to control the reverse insertion of the lining material 30. Although not shown, when the lining material 30 is completely inverted and inserted and reaches the housing lot 3, a heating medium such as hot water or high-temperature steam is injected into the lining material 30 with the inverted rope 32 fixed. Then, the lining material 30 is cured to complete the lining operation.
[0060]
The hardened lining material 30 allows the brim 31 to bend and extend into the new sewer 10 and closely adhere to the inner wall surface of the new sewer 10, thereby achieving good integration between the new sewer 10 and the service pipe 2. it can.
[0061]
<Experiment for specifying tube position by temperature difference>
First, as shown in FIGS. 14 and 15, the lower end of a ceramic pipe 200 (inner diameter: 150 mm) having a circular cross section, which is assumed to be a service pipe, is placed against the outer peripheral surface of a fume pipe 100 (thickness: 90 mm), which is assumed to be a newly installed drain. The openings were brought into contact with each other and fixed in a liquid-tight manner to prepare an experimental environment that was realistic.
[0062]
Further, temperature measurement sensors A, B, C, and C are provided at a B position corresponding to the connection center of the ceramic tube 200 on the inner surface of the fume tube 100, an A position and a C position of 10 cm above and below the connection portion, and a D position within the tip of the ceramic tube 200. D was arranged respectively. Further, the inner peripheral surface of the fume tube 100 was wet with water.
[0063]
・ Experiment 1
Then, as shown in FIG. 14, liquefied nitrogen LN (−160 ° C.) is continuously supplied into the pottery tube 200 at a rate of 1 liter / min. , B, C, and D were measured. The state of the inner surface of the fume tube 100 was appropriately observed.
[0064]
・ Experiment 2
Further, as shown in FIG. 15, a bag BG is inserted and arranged in the entirety of the pottery tube 200, hot water (90 ° C.) is supplied into the bag BG, and the temperature at each position is changed every predetermined time until two hours elapse. The temperature was measured by the sensors A, B, C, and D, and the condition of the inner surface of the fume tube 100 was observed. In particular, in this experiment, in order to prevent the temperature of the hot water in the pottery tube 100 from dropping, 10 liters of hot water was added every 10 minutes so that excess hot water overflowed.
[0065]
FIG. 16 shows the result of temperature measurement using liquefied nitrogen, and FIG. 17 shows the result of temperature measurement using hot water. As is clear from these figures, it was found that cooling or heating progressed in such a manner as to gradually spread from the connection center position to the periphery.
[0066]
Also, when the state of the inner surface of the fume tube was observed, when liquefied nitrogen was used, as shown in FIG. 18 at the start of liquefied nitrogen supply, frost began to form about 20 minutes after the start, and 30 minutes later As shown in FIG. 19, white and clear substantially circular frost adhered. The portion to which the frost adhered had a shape and size corresponding to the connecting area of the ceramic pipe on the outer surface of the new sewer, and the center position also corresponded to the center of the connecting position of the ceramic pipe. Then, the frost-attached portion maintained the shape and size corresponding to the connection region of the pottery tube thereafter.
[0067]
On the other hand, when hot water was used, a circular dry portion began to appear on the inner surface of the fume tube about 15 minutes after the start of hot water supply. After that, the circular dry portion spread over time, and when 30 minutes had passed, it became as shown in FIG. This dry part has the shape and size corresponding to the ceramic pipe connection area on the outer surface of the new sewer, and although the shape is somewhat distorted, the center position assumed from that shape is also the center of the ceramic pipe connection position It was corresponding. After that, the dried part spread further.
[0068]
Furthermore, regardless of whether liquefied nitrogen is used or hot water is used, the center position of the marking (frosted portion, dried portion) is always the same as the ceramic tube connection position regardless of the passage of time. It turned out to correspond to the center. This is supported by the above-mentioned temperature measurement result (the temperature change spreads from the center of the connecting position of the ceramic tube).
[0069]
Further, it was found that marking by frost by cooling can be performed more clearly than drying by heating. Furthermore, in the case of frost due to cooling, it turns out that if the frost adheres to the shape and size corresponding to the connection area of the pottery tube, then this state is maintained, so that more accurate and effective marking can be performed did.
[0070]
From these facts, it has been found that the connection position of the service pipe can be easily and inexpensively specified from the inner surface of the newly installed sewer by the method of the present invention.
[0071]
【The invention's effect】
As described in detail above, according to the present invention, there is an advantage that the connection position of the pipe can be easily specified without using an expensive device or the like.
[Brief description of the drawings]
FIG. 1 is a schematic vertical cross-sectional view showing a construction target of the service pipe restoration method.
FIG. 2 is an enlarged schematic vertical sectional view of a main part showing a procedure of a first step of the service pipe restoration method.
FIG. 3 is a schematic longitudinal sectional view showing a construction procedure of a first step of the service pipe restoration method.
FIG. 4 is a schematic vertical sectional view showing a procedure of a second step of the service pipe restoration method.
FIG. 5 is a schematic longitudinal sectional view showing a construction procedure of a third step of the service pipe restoration method.
FIG. 6 is an enlarged schematic vertical sectional view of a main part showing a construction procedure of a fourth step of the service pipe restoration method.
FIG. 7 is an enlarged schematic vertical sectional view of a main part showing a procedure of a fourth step.
FIG. 8 is a schematic vertical sectional view showing the procedure of the fourth step of the service pipe restoration method.
FIG. 9 is a schematic vertical sectional view showing a marking procedure in a fifth step of the service pipe restoration method.
FIG. 10 is a schematic vertical sectional view showing another marking procedure.
FIG. 11 is a schematic longitudinal sectional view showing a connection recovery procedure in a fifth step of the service pipe recovery method.
FIG. 12 is a schematic vertical sectional view showing a procedure of a sixth step of the service pipe restoration method.
FIG. 13 is a diagram showing a procedure for updating a sewer by a conventional excavator.
FIG. 14 is a cooling experiment procedure chart using liquid nitrogen.
FIG. 15 is a diagram showing the procedure of a hot water heating experiment.
FIG. 16 is a graph showing temperature measurement results in a cooling experiment using liquid nitrogen.
FIG. 17 is a graph showing temperature measurement results in a hot water heating experiment.
FIG. 18 is an experimental photograph showing a state before cooling or the like.
FIG. 19 is an experimental photograph showing a state of frost adhesion.
FIG. 20 is an experimental photograph showing a heat-dried state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Existing sewer, 2 ... Service pipe, 3 ... Residential land measure, 4 ... Water stop packer, 9 ... Ground improvement body, 10 ... New sewer, 11A ... Liquefied gas storage tank, 11B ... Liquefied gas supply pipe, 11C ... Liquefied gas supply valve, 18: In-pipe drilling robot, 19: In-pipe lining robot, 20: Temporary lining material, 30: Main lining material, 40: Sheath body, G: Ground improvement agent, LG: Liquefied gas.

Claims (3)

A method of specifying a connection position of a second pipe from inside the first pipe in a state where an opening at one end of the second pipe is connected to an outer surface of the first pipe,
The wall of the first tube at the connection position of the second tube is cooled or heated from the inside of the second tube, and a temperature difference is generated between the cooled or heated wall and a peripheral portion thereof. Or specifying the connection position from inside the first pipe based on a change in appearance of the inner surface of the first pipe caused by this temperature difference,
A method for specifying a connection position of a pipe, characterized in that: After cutting and removing the existing sewer without cutting and laying a new sewer at the removal site and updating the sewer, a hole communicating with the service pipe is formed in the new sewer and at least the new A lining is formed over the area spanning the sewer and the service pipe, and the new sewer and the service pipe are integrated.The existing sewer buried underground is not cut into the new sewer. A non-drilling restoration method of a service pipe applied when updating,
After laying the new sewer, before forming a hole communicating with the service pipe in the new sewer, cooling or heating the wall portion at the connection position with the service pipe in the new sewer from the service pipe. A temperature difference is generated between the cooled or heated wall portion and its surrounding portion, and the service pipe is drawn from inside the new conduit based on the temperature difference itself or a change in the appearance of the inner surface of the new conduit caused by the temperature difference. Identify the connection location of
Thereafter, forming a hole communicating with the service pipe from within the newly installed sewer at the specified connection position,
A method of restoring service pipes at the time of renewal of underground sewers, which is characterized in that: 3. The method according to claim 2, wherein the heating or cooling is performed by supplying a heating fluid or a cooling fluid into the service pipe.

Images