JP4382921B2 - Pipe laying method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe laying method.,The pipe-in-pipe method relates to a method for rehabilitating shield secondary lining and existing sewer pipes that are pipes in tunnels.
[0002]
[Prior art]
As sewerage pipes age, the water flow capacity declines, eventually leading to blockages due to landslides.
[0003]
Therefore, it is necessary to rehabilitate the sewer pipe in a timely manner before the use of the sewer pipe becomes impossible, and as one of the construction methods, a pipe-in-pipe construction method in which a new pipe is inserted and installed in an old sewer pipe is known. In this case, it is required to make the inner diameter of the new pipe as close as possible to the inner diameter of the existing sewer pipe to ensure the previous water flow rate. For this purpose, the outer diameter of the inner pipe is made as close as possible to the inner diameter of the existing pipe. Efforts are made. However, the gap between the existing pipe and the new pipe becomes very narrow under the conditions of the existing sewer pipe, and it is often impossible to connect the inner pipe within the existing sewer pipe. A method of inserting into existing sewer pipes while being connected is applied.
[0004]
In the pipe-in-pipe construction method, the inner surface of the existing sewage pipe has high frictional resistance due to its aging, and a large pressure input is required to press-fit the new pipe as it is, making the work difficult and new There is a high possibility that a buckling breakage of a pipe, a breakage of an old sewer pipe, etc. will occur. To solve this problem, for example, an existing old sewer pipe as disclosed in Japanese Utility Model Publication No. 62-41982 is disclosed. Inserting an inner pipe with an outer diameter that is considerably smaller than the inner diameter of the inner pipe using a transport cart, or wrapping a band with wheels around the inner pipe and attaching wheels to the inner pipe at regular intervals in the outer direction facilitates insertion work. We are trying to make it.
[0005]
In this case, a filling material, such as mortar, is injected and filled into the gap formed between the outer surface of the inner pipe and the inner surface of the existing sewage sewer pipe. At this time, the inner pipe is lifted by the injected mortar or the like. The top of the inner pipe comes into contact with the inner upper surface of the existing sewer pipe. Therefore, a mortarless portion is formed between them, and a floating stopper is attached to the inner pipe to prevent this. In the case of using the above-mentioned band with wheels, the wheel located on the top side of the new pipe serves as a lift stopper.
[0006]
As described above, in the conventional pipe-in-pipe method, the distance between the inner surface of the existing sewer pipe and the outer side of the new pipe is controlled by the height of the lift stopper, and the height of the lift stopper is uniform. For some reason, the extended state of the new pipe will follow the top surface of the inner surface of the existing sewer pipe in parallel. In this case, the inner pipe top of the existing pipe is partly raised or lowered due to unequal subsidence or damage due to aging and is often not linear, so it is laid parallel to the top of the existing pipe. The new pipe is not laid in a straight line but is laid in a bent state in the vertical direction.
[0007]
There is also a construction method that makes the floating stopper moveable, changes according to the change in the distance between the inner surface of the old sewage pipe and the outer surface of the new pipe, and makes the inner pipe one by one with a gradient, but especially with concrete In the case of water pipes, corrosion due to hydrogen sulfide or the like is severe, and the internal diameter is often maintained as well as peeling off. Therefore, in this case, there is a drawback that the reference value cannot be reproduced in most cases by adjusting the gradient in units of one tube.
[0008]
As described above, in the conventional construction method, it is often the case that a predetermined natural flow gradient is not partially maintained in existing sewer pipes because of bending due to unequal subsidence after construction of the pipeline. However, the slope of the sewage pipe is specified to be approximately 3/1000 or less, and therefore, the new pipe is still natural as long as it follows the inner surface of the old sewer pipe that deviates from the natural flow slope. There was a problem that it was not possible to satisfy the conditions of the downflow gradient, and it was impossible to rehabilitate the existing sewer pipes.
[0009]
In addition, since it is necessary to make one inner pipe laying work relatively short, it is necessary to frequently insert cement and other internal filling agents, which increases the construction period and takes a lot of work. There was a problem.
[0010]
Japanese Patent Laid-Open No. 7-91567 discloses that a pipe receiving member and a floating prevention stopper are attached to an inner pipe used by a new pipe every predetermined number, and the inner pipe is inserted at a place where the inner pipe is lowered to an existing pipe, and the inner pipe is connected with a jack or the like A construction method is disclosed in which the pipes are connected to form a new pipeline. Even in this method, every time the inner pipe is laid out to a certain length, a filling material such as mortar is injected between the outer pipe and the inner pipe, and then the inner pipe is continuously inserted again. As will be repeated, in general, since the insertion interval of the insert material is about 100 m at the maximum due to the transfer of the insert material, it is considered that this method is intended for a line length of 100 m or less. It is done.
[0011]
In this construction method, a rod-like body that can be expanded and contracted vertically is fixed to the outside of the upper part of the constituent pipes, and the protruding length of the rod-like body is adjusted to ensure the necessary clearance, and the tip of this rod-like body is attached to the existing aging. It acts as a stick sticking against the upper inner wall of the tube. Moreover, the height adjustment method of a pipe bottom face is performed by changing the height of the wheel itself.
[0012]
In this case, the height of the inner pipe can be determined regardless of the bending of the existing aging pipe. However, the inner walls of aging existing pipes are generally corroded and easily damaged by a slight force.In such a method of adjusting the height above and below the wheel and fixing the height with a rod-like body, At the pin point with which the rod-shaped body abuts, it is difficult to stably maintain the set height, and therefore it is difficult to make the gradient strictly constant. In addition, as described above, since it is necessary to repeat this every time the inner pipe is constructed with a relatively short distance, the construction period also takes a lot of time and labor.
[0013]
[Problems to be solved by the invention]
An object of the present invention is to provide a pipe laying method that can rehabilitate an old sewer pipe that has deteriorated by using a pipe-in-pipe method, including a natural downflow gradient. It was made for the purpose of providing a pipe laying method that can be set precisely and shorten the construction period.
[0014]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the pipe laying method of the invention according to claim 1 (invention 1) is to connect the inner pipes of unit length into the existing pipe line while sequentially inserting them into the existing pipe line. A pipe laying method for laying a path, which is inserted into an existing pipe line while sequentially connecting the inner pipes arranged in a working opening provided at an inner pipe insertion place. Each time it is connected, the next inner pipe is inserted through the inner pipe insertion aid that is removable from the inner side of the inner pipe, and then the inner pipe is further inserted while being connected. This is repeated and inserted. When the rear inner tube reaches the working opening, the insertion of the new inner tube is stopped, the inner tube insertion assisting tool inserted first is removed from the inside, and the inner tube on the inner side of the removed inner tube inserting assisting tool is removed. The height of the pipe is adjusted and the pipe height is fixed, and a partition wall is provided in the gap between the inner pipe and the existing pipe. The inner tube is inserted into the inner tube by the length of the inner tube insertion assisting tool after the inside material is hardened, the adjacent inner tubes are connected to each other, and this is repeated to form a new pipe. This is a laying method.
[0015]
According to the pipe laying method (invention 2) of the invention described in claim 2, the inner tube insertion assisting tool can be fixed to the inner tube adjacent to the front and rear of the inner tube insertion assisting tool, and can be removed from the inner side of the inner tube insertion assisting tool. The pipe laying construction method according to the first aspect of the invention is characterized in that the inner pipe insertion assisting tool removed after the removal can be conveyed to the working opening through the inside of the inner pipe.
[0016]
The pipe laying method (invention 3) according to claim 3 is characterized in that the inner pipe is provided with a height adjusting tool, a height fixing tool, and a wheel. This is the pipe laying method.
[0017]
[0018]
In the pipe laying method of the present invention, the material of the inner pipe used may be any material that can be closed by repairing the through-hole opened in the pipe body with a fiber reinforced polyester resin, for example, vinyl chloride, fiber reinforced Synthetic resins such as polyester resins; synthetic resins combined with inorganic materials such as resin concrete and fiber reinforced resin concrete; those made of inorganic materials such as concrete with reinforcing steel bars are applied.
[0019]
The inner tube insertion assisting tool according to the first and second aspects of the present invention is provided with a fixing tool capable of fixing the inner tube insertion assisting tool at the end of the inner tube adjacent to both ends thereof, and is a constituent member of the inner tube insertion assisting tool. Can be disassembled from the inside of the inner tube, and the structure is particularly determined if the disassembled components are assembled so as to be disassembled to a size that can be conveyed through the inner tube to the working opening. For example, a combination of a metal such as iron or stainless steel or a member made of synthetic resin by bolts or fitting may be used.
[0020]
That is, the inner tube insertion assisting tool of the present invention includes an inner tube already inserted every time the inner tube is inserted into the existing tube while being connected and inserted into the existing tube up to a predetermined length for injecting the internal loading agent. It arrange | positions between an inner tube | pipe, and the further inner tube | pipe which is connected is inserted and this is repeated. When the final end of the inserted inner tube reaches the working opening, the insertion of the inner tube is stopped, and the inner tube insertion aid inserted first is disassembled and removed from the inside of the inner tube. Therefore, after the removal, a space corresponding to the length of the inner tube insertion aid is generated.
[0021]
This space is used as a working space for installing a partition wall that is provided so that the insert material does not flow out when the insert material is press-fitted into the gap between the inner pipe and the existing pipe. If the space is usually about 1m long, the partition wall installation work can be carried out. However, depending on the situation at the site, it may be made longer or shorter as appropriate. it can. Therefore, the length of the inner tube insertion assisting tool is not particularly defined, and an optimum length may be determined for each construction site.
[0022]
Thus, since the inner tube insertion aid is usually short, if one end of the inner tube insertion aid is inserted into the inner tube and supported, the wheels need not necessarily be attached. Absent. However, if the length of the inner tube insertion assisting tool is long and its weight is applied to the end of the inner tube and the inner tube may be damaged, it is advantageous to attach the wheel.
[0023]
The inner pipe used in the present invention is provided with a height adjusting tool, a height fixing tool, and a wheel. The height adjuster is used to determine the gradient of the inner pipe. Specifically, the height adjuster makes the top height of the inner pipe inserted and connected to the existing pipe line precise. The structure is not particularly limited as long as the height of the inner pipe can be adjusted by raising and lowering a measuring rod equipped with a measurement scale for measuring the pipe top height by the level measurement amount. Is not to be done.
[0024]
The structure of the height adjuster is a jig having a structure in which the height adjuster provided on the inner tube is supported so that the height of the inner tube can be adjusted from the inside of the inner tube via a support shaft that can move in the axial direction. At least one is provided on the side of the inner pipe close to the working opening, and the lower end abuts against the upper inner wall of the existing pipe through the through hole provided in the bottom pipe wall of the inner pipe. The upper end of the jig is in contact with the upper inner wall of the inner tube.
[0025]
Specifically, for example, it is composed of a rod-like body provided with an external thread on the outside and a cylindrical body provided with an internal thread on the inner surface, and the rod-like body is screwed into the tubular body. It penetrates the bottom wall surface and its lower end is in contact with the bottom of the existing pipe. The upper end of the rod-shaped body is in contact with the upper inner wall surface of the inner tube. A handle for rotating the cylindrical body is detachably provisionally fixed to the cylindrical body, and the height of the cylindrical body is adjusted by rotating the handle to raise and lower the rod-shaped body. There are things. Note that the vertical movement of the rod-shaped body is not necessarily a screw type, and when an inner pipe having a large diameter is used, a hydraulic type may be used.
[0026]
The mounting position of the height adjuster is not particularly limited, but when adjusting the height of the inner tube as long as it is near the end of the inner tube near the working opening from the center of the unit length. Advantageously, the adjustable stroke of the screw is increased so that the adjustment can be made more precisely.
[0027]
The height fixing tool is used to prevent the inner pipe from rising and changing the inner pipe height set by the height adjustment tool when filling the filling material. It is used to partially fill the gap between the upper part of the inner pipe and the top of the existing pipe with a filling material before press-fitting, and its structure is a small lump of filling material. Any structure can be used as long as it can be fixed to the gap in a state, and is not particularly limited.
[0028]
In addition, the filling material mentioned here is, for example, an inorganic material such as cement concrete, cement milk, air mortar, etc. to which a quick setting agent or a flow aid is added; a synthetic resin such as epoxy or urethane, or a foam thereof. Any material can be used as long as it has fluidity when pressed and hardens quickly after pressing and has a high compressive strength. Also, the material press-fitted into the height fixture and the material filled in the gap between the inner pipe and the existing pipe may or may not be the same, but considering the cost and labor, Cement-based materials are preferably usedThe
[0029]
The structure of the height fixing device is a jig that can hold the inside-filling agent by press-fitting it inside, and its shape is bag-like, and its mounting method is a through-hole provided on the upper tube wall of the inner tube This jig has an opening on the inner side of the inner tube through the hole and is formed in a bag shape toward the outer side, and is provided with a valve that is opened and closed when the filling material is injected and stopped.
[0030]
The material of the bag-like height fixing tool is high in strength and rich in elasticity, does not break when the insert material is press-fitted, and changes following the wall shape of the existing pipe, and Any material can be used as long as it does not change the shape at the time of press-fitting with respect to temperature change or volume change when the filling material is cured, for example, cloth such as canvas having excellent elasticity and strength; synthetic rubber, natural rubber, or The cloth etc. which coated these are mentioned.
[0031]
At least one height fixture is attached to the upper part of the inner tube. The height fixture is used to prevent the inner pipe from floating when the filling material is filled. If the upper inner wall of the existing pipe is severely damaged, etc. However, if it cannot be stably maintained, two or more may be used.
[0032]
In addition, the height fixing tool may be provided in the lower part of the inner tube in addition to the upper part of the inner tube. In this case, since the inner pipe is sandwiched between the upper and lower height fixing portions, there is an advantage that there is less risk of movement when the filling material is press-fitted.
[0033]
The valve provided in the height fixture is opened and closed when the filling material is injected and stopped. That is, when press-fitting inserts such as cement, open the valve by connecting the end of the transfer pipe of the inserts, and press the amount of inserts sufficient to fix the inner pipe at a predetermined height. This is to close it and leave it until it is hardened so that the filling material press-fitted into the height fixture does not flow out.
[0034]
The valve is removed after the filling material has hardened, and the remaining through-holes after being removed are repaired together with the through-holes to which the height adjusters are attached, for example, by hand-laying up fiber reinforced polyester resin. Then, the inner wall of the inner tube is corrected smoothly.
[0035]
The wheels attached to the inner pipe should be as small as possible. This is because, as a result of adjusting the height of the inner pipe, the height of the bottom of the inner pipe becomes less than the outer diameter of the wheel, making it impossible to adjust the height, and it becomes impossible to obtain a predetermined pipeline gradient. This is to reduce fear.
[0036]
(Operation) As described above, in the pipe laying method of the present invention, the inner pipe insertion auxiliary tool is used to continuously lay the long-distance inner pipe, and then provide partition walls for each unit length. Since the filling material can be injected, the construction work of cement and the like can be carried out at once, the construction period is short, and the long-distance pipe laying work is possible.
[0037]
In addition, since the height fixture is a tough bag with elasticity, when cement or the like is pressed into it, it comes into contact with the inner wall of the existing pipe over a wide area, and there is some damage to the inner wall of the existing pipe. However, the height can be stably maintained.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings of non-limiting examples. FIG. 1 is an explanatory view showing an example of an inner tube insertion assisting tool of the present invention, and FIG. 2 is an explanatory view showing a procedure for inserting an inner tube using it.
[0039]
In FIG. 1, an inner pipe insertion assisting tool C is in a rectangular shape in which a square pipe batting bar 1 that abuts an end surface A <b> 1 of the inner pipe A and pushes the inner pipe A is connected to a square pipe frame bar 2 with bolts 11. Assembled. In the vicinity of the four corners of the rectangle, a square-pipe tension bar 3 is connected to the frame bar 2 with bolts 21. Further, a support rod 4 made of a square pipe for connecting the inner tube insertion assisting tool C to the inner tube A is connected by bolts 41 in the vicinity of the four corners of the rectangle. The support rods 4 are provided on both sides of the inner tube insertion aid C.
[0040]
The inner tube insertion assisting tool C assembled in this way is supported by inserting the support rod 4 into the inner tube A previously disposed in the existing tube B, and the other support rod 4 is Subsequently, it is inserted into the inner pipe A to be connected and inserted into the existing pipe B.
[0041]
When the inner tube insertion assisting tool C reaches a predetermined location, the bolts 11, 21, 41 are removed from the inside of the inner tube with a spanner or the like, disassembled into a square pipe-like member, and carried out through the inner tube.
[0042]
The procedure for inserting the inner tube into the existing tube using the inner tube insertion assisting tool is shown in FIG. 2A is a view in which the inner tube is connected before and after the inner tube insertion assisting tool, and FIG. 2B is a diagram in which the inner tube insertion assisting tool is removed to create a working space. (C) shows the figure which connected the inner pipe before and behind the removed inner pipe insertion tool, respectively.
[0043]
The existing pipe B is provided with a rail 15 for guiding a wheel 14 attached to the inner pipe A in advance, and the inner pipe A is disposed on the rail 15 through the working opening. When a certain number of inner pipes A are connected and inserted into the existing pipe B, the inner pipe insertion assisting tool C is connected. Subsequently, the inner pipe A is further connected, and this is repeated in the existing pipe B. When the new pipe is temporarily laid and reaches the working opening, the insertion of the inner pipe is stopped.
[0044]
The first inner tube insertion assisting tool C is disassembled from the inside of the inner tube A in the above-described procedure, and the disassembled member of the inner tube insertion assisting tool C is carried out through the inner tube A to the working opening. . Therefore, a space corresponding to the length of the inner tube insertion aid C disassembled at this time is created, and the height of the inner tube A on the back side is adjusted and the height is fixed using this space. A partition wall will be installed and a part of the new pipe will be completed by press-fitting inset agent.
[0045]
Thereafter, the inner pipe A on the near side is pushed in, the inner pipe A following the partially completed new pipe is connected, and this is repeated to complete all the new pipes and make new pipes.
[0046]
FIG. 3 is an explanatory view showing an example of the height adjuster D. As shown in FIG. The height adjuster D is fixed to the upper end of the cylindrical support column 5 and the cylindrical support column 5, and the rotary handle 7 whose inner surface is a female screw and the outer periphery is a male screw over the entire length, and passes through the rotary handle 7. The measuring rod 6 is screwed and the lower part is inserted into the cylindrical column 5. The cylindrical column 5 passes through the through hole A2 provided in the bottom of the inner tube A and is formed on the bottom surface of the existing tube B. The opposite end of the measuring rod 6 screwed into the rotary handle 7 is brought into contact with the top of the inner tube A so that the inner tube A can be supported as a whole.
[0047]
The cylindrical support 5 is provided with a rotating handle 7 for moving the measuring rod 6 up and down at the upper end. The rotary handle 7 is provided with a handle 8 protruding from the outer side of a short cylindrical main body, and the inner peripheral surface of the main body of the rotary handle 7 is a female screw over the entire surface. The rotary handle 7 is fixed to the upper end of the cylindrical support column 5, and the measuring rod 6 is screwed into the internal thread of the inner peripheral surface so as to protrude above and below the rotary handle 7, and one end of the measuring rod 6 is in the cylindrical support column 5. The other end of the measuring rod 6 is in contact with the top of the upper tube of the inner tube A. By rotating the rotary handle 7 with the handle 8, the cylindrical support 5 that is pressed against the bottom of the existing pipe B and cannot be moved in the vertical direction rotates, and the measuring rod 6 moves up and down by the female screw of the rotary handle 7. To do.
[0048]
In the case of the present embodiment, only the rotary handle 7 is provided with an internal thread, the rotary handle 7 and the cylindrical support 5 are fixed and integrated, and the rotary handle 7 is rotated and integrated with the cylindrical support 5. When trying to rotate, the main body of the cylindrical column 5 is in contact with the bottom surface of the existing pipe B so as not to move up and down, so the cylindrical column 5 rotates without moving up and down and is therefore screwed into this. Although the measuring rod 6 is moved up and down, a screw may be provided on the inner surface of the cylindrical column 5 and the measuring rod 6 may be screwed directly into the cylindrical column 5.
[0049]
The cylindrical struts 5 and the measuring rod 6 may be provided with flat plate-like plates 10 and 11 at the end portions that abut on the existing tube B or the inner tube A, respectively. The contact plates 10 and 11 are pinpointed with the bottom end of the cylindrical support column 5 or the upper end of the measuring rod 6 on the bottom surface of the existing sewer pipe B or the upper inner wall of the inner tube A, and the bottom surface of the existing pipe B When the upper inner wall of the inner tube A is supported, an excessive load is applied to the contact point to prevent the existing tube B and the contacted portion of the inner tube A from being damaged. The contact plates 10 and 11 may be attached to the end portions of the cylindrical support column 5 and the measuring rod 6 from the beginning, or may be applied to the contact portion when the height is actually adjusted.
[0050]
The measuring bar 6 is provided with a measurement scale 9 for height measurement using a level meter. Therefore, the slope of the inner pipe A is the height adjustment tool.DSince the fine adjustment is possible by rotating the screw, it can be strictly determined by a precise level measurement amount.
[0051]
FIG. 4 is an explanatory view showing an example of the height fixture E. FIG. The height fixing device E is a canvas-like bag body 12 that is rubberized on the inner surface, has an opening on the inner surface of the inner tube A of the through hole A3 opened in the inner tube A, and is formed on the outer surface of the inner tube A. A bag-like body 12 is provided.
[0052]
A through-hole A3 opened in the inner pipe A is provided with a valve 13 provided so as to be removable, and the valve 13 is provided with a pipe connection port 131 for connecting the filling material transport pipe 14 inside the inner pipe A. The height fixing tool is provided outside the inner tube A.EA bag attachment port 15 for attaching the opening is provided. The structure of the bag attachment opening 15 is not particularly limited as long as the height fixing tool E which is the bag-like body 12 can be securely attached and the filling material can be removed after curing. Similarly, the connection method of the pipe connection port 131 is not limited, and the attachment method of the valve 13 is not limited.
[0053]
The height of the inner tube A whose height has been adjusted by the height adjusting tool D is maintained by the height fixing tool E. The height fixing operation is performed using a space where the inner tube insertion assisting tool C having a length for press-fitting the insert material is removed and is used for the operation. In the method, first, after the inner pipe A is adjusted to a set height, the filling material transport pipe 14 is connected to a pipe receiving port 131 provided in the valve 14, the valve 13 is opened, and the filling material is removed. It is press-fitted into the bag-like body 12. Since the pipe height is kept constant by the height adjuster D, the filling material is filled into the bag-like body 12, and a small lump of the required size is formed in the gap between the inner pipe A and the existing pipe B. When this happens, the valve 13 is closed and the filling material is allowed to harden. After the filling material is cured, the bag-like body 12 is removed from the valve 13, the valve 13 is removed from the inner tube A, and then the inner surface of the inner tube A is smoothly repaired with a fiber reinforced polyester resin or the like. In this state, the partition wall is attached, the height adjuster D is removed, the removed through hole A2 is closed with fiber reinforced polyester resin, and the inner wall of the inner pipe A is smoothly repaired. Thereafter, the filling material is injected into the back side of the partition wall and cured.
[0054]
In this case, when the same operation is performed with the height fixture E provided at the bottom of the inner pipe A, the inner pipe A is fixed at a predetermined height in the existing pipe B at the upper and lower sides. When press-fitting, the height is unlikely to be distorted, and the gradient can be made more precise.
[0055]
In this way, after the inner pipe whose height has been adjusted is completely fixed by the filling material and made into a pipeline, the inner pipe that continues from the work opening is inserted and connected to the completed pipeline. This is repeated to form a new pipeline.
[0056]
(Construction Example 1)
In the existing sewer pipes made of concrete with an inner diameter of 1000 mm and a length of 400 m, as inner pipes, a wheel is provided on the lower outer side of a fiber reinforced resin concrete pipe with an outer diameter of 800 mm and a length of 4 m. To the figureTo 3The height adjustment tool shown is provided with a through hole in the upper part, and the height fixing tool shown in FIG. 4 is attached to the height adjustment tool, and the inner pipes thus constructed are inserted while being connected. The inner pipe was further connected via an inner pipe insertion aid with a square frame structure made of 1 m iron angle and disassembled from the inside of the inner pipe, and this was repeated to temporarily install a new pipe having a length of 400 m. .
[0057]
Remove the inner tube insertion aid inserted first, adjust the height, press the cement mortar into the height fixing tool, install the partition wall after curing, press the cement mortar into the back, The inner pipe before hardening was inserted and connected, and this was repeated to lay a new pipe over the entire length of the existing pipe.
[0058]
In this construction example, construction can be carried out at a construction speed of 40 to 60 m in terms of the amount of daily advance, more than twice the conventional pipe laying construction method in which the pipes are connected in narrow places in the existing pipes. The construction length of the round could greatly exceed about 100 m of the conventional method.
[0059]
Compared to the conventional method of connecting while adjusting the height of each inner pipe with a wooden height adjuster, the pipe slope is adjusted by adjusting the height of each pipe collectively after 80 m temporary installation. Thus, while the conventional method required an adjustment time of 1 hour, in this construction example, the adjustment work could be completed in about 5 minutes.
[0060]
【The invention's effect】
As described above, according to the construction method of laying a new pipe line in an existing pipe of the present invention, a long-distance new pipe line can be formed at once by using an inner pipe insertion aid that can be removed from the inner side of the inner pipe. Not only can it be laid, but it is possible to fix the new pipe line with the insert material in sequence, so the construction period can be shortened. Furthermore, the height of the inner pipe is finely adjusted by a screw method with a measuring rod with a measuring scale, the gradient is determined by level meter measurement, this height is fixed with a bag-like height fixing tool, and the insert material is press-fitted. Therefore, it becomes possible to make a new pipeline with a precise pipe gradient.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of an inner tube insertion aid of the present invention.
FIG. 2A is a diagram in which an inner tube is connected and inserted before and after an example of an inner tube insertion aid.
(B) The figure which removed the example of the inner tube insertion auxiliary tool, and made the working space.
(C) The figure which connected the inner tube before and behind an example of the removed inner tube insertion tool.
[Fig. 3]Explanatory drawing which showed the procedure which adjusts the height of an inner pipe using an example of a height adjustment tool, and this.
FIG. 4 is an explanatory diagram showing an example of a height fixing tool and a procedure for fixing the height of the inner tube using the height fixing tool.
[Explanation of symbols]
A inner pipe
B Existing pipe
C Inner tube insertion aid
D Height adjuster
E Height fixture
1 batting stick
2 Frame stick
3 Tension bar
4 Support rod
5 Cylindrical support
6 Measuring rod
7 Rotating handle
8 Handle
9 Scale plate
10 Address plate
11 Address plate
12 Bag-shaped body
13 Valve
14 Cement transport pipe
15 Bag-shaped body connection part

Claims (3)

  A pipe laying method in which an inner pipe of a unit length is inserted into an existing pipe line while being sequentially connected and a new pipe line is laid in the existing pipe line. The arranged inner pipes are inserted into the existing pipe line while being sequentially connected, and each time the predetermined number of inner pipes are connected, the inner pipe can be removed from the inner pipe through the inner pipe insertion aid. The inner tube is inserted, followed by inserting the inner tube while further connecting it. This is repeated, and when the inserted inner tube reaches the working opening, the insertion of the new inner tube is stopped and inserted first. Remove the inner tube insertion aid from the inside, adjust the height of the inner tube on the inner side of the removed inner tube insertion aid and fix the height of the inner tube, and partition the gap between the inner tube and the existing tube. Insert the inner tube into the back of the partition wall, insert the inner tube further by the length of the inner tube insertion aid after the inner material has hardened, Laying method of a tube the inner tube together connected, characterized in that it is a Shinkanro Repeat this fit.   The inner tube insertion aid can be fixed to adjacent inner tubes before and after the inner tube insertion aid, and the inner tube insertion aid can be removed from the inside of the inner tube insertion aid and removed after passing through the inner tube. The pipe laying method according to claim 1, wherein the pipe can be conveyed to the working opening.   The pipe laying method according to claim 1, wherein the inner pipe is provided with a height adjusting tool, a height fixing tool, and a wheel.

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