JP4502744B2 - Rehabilitation of drainage stack - Google Patents

Description

  The present invention relates to a method for rehabilitating a drainage stack disposed in a multi-layered building such as an apartment house or a building.

  A multi-layered building such as an apartment house or a building is provided with a drainage standpipe for flowing wastewater discharged from each floor to a sewer. Such drainage stacks deteriorate with long-term use and cause corrosion, thinning, cracks, cracks, and the like. However, the drainage stack is usually provided through a concrete slab constituting the slab floor surface of each floor, and the penetrating portion is hardened with mortar or the like. Therefore, all existing drainage stacks cannot be replaced with new pipes unless the mortar part is crushed. Then, in order to prevent the aging of the existing piping and extend the use period of the drainage stack, a method of lining the inner surface of the piping with an epoxy resin after polishing and cleaning has been proposed (for example, Patent Documents 1 to 3).

  Patent Document 1 “Method for correcting drainage vertical pipe” is a method of spraying a liquid epoxy resin on the inner surface of a pipe, and as shown in FIG. 6, the drainage vertical pipe 51 is cut at two locations, the lower part and the upper part. A step of cleaning, a cleaning step of removing deposits on the inner wall of the tube after cutting, a drying step, a heated hose 54 inserted in the tube with adjustable movement speed and moving at a required constant speed, and a paint spray nozzle at the tip 55, a process of forming a coating film by ejecting a quick-drying two-component epoxy resin paint from 55.

  The “pipeline repairing method” of Patent Document 2 is a method of sticking an impermeable cylindrical sheet to the inner surface of a pipe, and as shown in FIGS. A second liner member 62 having a water-impermeable inner surface layer portion formed in a cylindrical shape is supplied into the drain pipe 61 through the bent pipe 65. The tip of the second liner member 62 is inserted into the drain pipe 61 in an inverted state, and a liquid pressure of a liquid such as water is applied between the inner surface layer portions of the inverted portion in the inverted state. Thus, the inverted portion of the second liner member 62 is advanced to the back of the drain pipe 61.

  Patent Document 3 “Tube Lining Method” uses an impervious cylindrical sheet as an epoxy resin-impregnated cloth sheet. As shown in FIGS. 8A and 8B, a plurality of elastic tubes 72 are provided. The elastic tube is formed into a cylindrical shape, and the outer peripheral surface of the elastic tube is covered with a resin absorbent material made of woven fabric or non-woven fabric to form a lining material 71. The resin absorbent material of the lining material is impregnated with a curable resin. However, the elastic tube 72 is drawn into the conduit 73 and injected with pressure fluid to expand the elastic tube 72. After the curable resin is cured, the elastic tube is pulled out.

Japanese Patent Application Laid-Open No. 5-31456, “Method for correcting drainage vertical pipe” JP-A-6-106622, “Pipeline repair method” JP 2002-160295 A, “Pipe lining method”

  In the method of Patent Document 1 described above, since the epoxy resin is directly sprayed and applied to the inner surface of the pipe, various measures have been taken, and it is difficult to form a resin layer with a uniform thickness on the inner surface of the pipe. If the length is long, the formation of the resin layer cannot be sufficiently confirmed, and there is a problem that reliability is applied.

  Also, in Patent Documents 2 and 3, since the cylindrical sheet is adhered to the inner surface of the pipe, unlike the spray coating method, the thickness of the sheet forming the film is constant, so the thickness is uniform on the inner surface of the pipe. The resin layer can be formed in this way, which is excellent in terms of the surface, but there is a problem that the rehabilitation of the complicatedly arranged pipe such as a horizontal branch pipe connected to the drainage standpipe takes too much time. It was.

  The present invention has been devised in view of these problems. That is, the object of the present invention is to save time and effort even when the length of a drainage stack arranged through each slab of a plurality of floors is long, or when a horizontal branch pipe is connected to the drainage stack. Accordingly, it is an object of the present invention to propose a drainage stack rehabilitation method that can easily form a resin layer with a uniform thickness on the inner surfaces of all the pipes including branch pipes in a short time.

According to the present invention, there is a method for rehabilitating a drainage stack disposed through a concrete slab constituting a floor surface of a plurality of floors,
Cutting the drainage stack between the floor to be rehabilitated and the upper floor at a predetermined position from the slab floor surface of the current floor and at a predetermined position from the slab ceiling surface of the upper floor, and removing the connecting portion therebetween Process,
After the inner surface of the slab penetration part of the drainage stack remaining on the slab floor surface of the current floor and / or the slab ceiling surface of the upper floor is polished and washed, a penetration part renovation step of forming an epoxy resin film on the inner surface,
The removed portion in the cutting step, and a connecting portion retreading process annex a new tube, Ri Tona,
In the penetration part rehabilitation process,
Prepare a tubular cloth sheet having a penetrating part and a penetrating part renewal tool comprising a flexible liquid-tight bag containing the sheet and containing only one end,
From the open end of the liquid-tight bag, a liquid epoxy resin is poured, and the entire tubular cloth sheet is impregnated with the epoxy resin,
Cover the opening end of the liquid-tight bag and the tubular cloth sheet over the opening of the remaining slab penetrating part, and insert the tubular cloth sheet into the slab penetrating part while inverting it,
A method for rehabilitating a drainage standpipe , wherein air is injected from an opening end of the liquid-tight bag, the liquid-tight bag is spread, and a tubular cloth sheet impregnated with an epoxy resin is brought into close contact with the inner surface of the pipe Is provided.

According to a preferred embodiment of the present invention, the tubular cloth sheet has a branch pipe part corresponding to the branch pipe connected to the slab penetration part of the drainage stack .

  Furthermore, it is preferable that the cutting step, the penetration portion renovation step, and the connection portion rehabilitation step are repeated sequentially or in parallel from any floor.

  According to the rehabilitation method of the present invention, the inner surface of a part of the drainage stack (slab penetration part) left in the cutting process is polished and washed in the penetration part rehabilitation process, and an epoxy resin film is formed on the inner surface. The work can be completed in a short time compared to the conventional method of rehabilitating the entire drainage stack. Moreover, since the pipe length of the drainage standpipe (slab penetration part) to remain is short, the confirmation inspection of the film formation state of an epoxy resin is easy.

  In addition, a cylindrical cloth sheet impregnated with a liquid epoxy resin is used, and the cloth sheet has a cylindrical portion corresponding to the branch pipe connected to the slab penetrating portion of the drainage stack. An epoxy resin film can be reliably formed on the branch portion of the tube.

  Furthermore, the rehabilitation work can be performed sequentially or in parallel from a convenient room by repeating the three steps of the cutting step, the penetration portion renewal step, and the connecting portion renewal step sequentially or in parallel from any floor.

  Therefore, the drainage stack rehabilitation method of the present invention is such that the drainage standpipe is connected to the drainage standpipe even when the length of the drainage standpipe disposed through the slabs of the plurality of floors is long. Even in this case, there are excellent effects such that the resin layer can be formed with a uniform thickness on the inner surface of all the pipes including the branch pipes in a short time without trouble.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a schematic view showing a method for rehabilitating a drainage stack according to the present invention. The present invention is a method of rehabilitating a drainage stack 10 disposed through concrete slabs 1 and 2 constituting a plurality of slab floor surfaces 1a and 2a. As shown in this figure, the drainage stack rehabilitation method of the present invention comprises a cutting step (A), a penetration portion rehabilitation step (B), and a connection portion rehabilitation step (C).

In the cutting step (A), the drainage stack 10 between the floor to be rehabilitated and the upper floor is cut at a predetermined position from the slab floor surface 1a of the current floor and at a predetermined position from the slab ceiling surface 2b of the upper floor. Then, the connecting portion 13a therebetween is removed.
For example, in a predetermined floor to be rehabilitated, the straight pipe portion of the existing drainage stack is cut out while leaving the predetermined dimension H1 from the slab floor surface 1a and the predetermined dimension H2 from the slab ceiling surface 2b. At this time, when the new straight pipe 13b is finally connected, a slight straight pipe portion is left for easy attachment. Accordingly, the predetermined dimensions H1 and H2 are preferably about 25 to 50 cm.

In the penetration part renovation step (B), the inner surface of the slab penetration part 11 of the drainage stack remaining on the slab floor surface 1a of the current floor is polished and cleaned, and then an epoxy resin film is formed on the inner surface of the slab penetration part 11.
In this case, since the lower floor of the predetermined floor is also renovated, polishing and cleaning and formation of an epoxy resin film may be performed up to a portion substantially corresponding to the predetermined dimension H2.
If necessary, instead of the slab penetration part 11 on the current floor, the inner surface of the slab penetration part 12 on the upper floor may be polished and cleaned, and then an epoxy resin film may be formed on the inner surface. Both the slab penetrating parts 11 and 12 on the floor may be polished and cleaned in parallel to form an epoxy resin film.
When forming the resin film by polishing and cleaning the inner surface of the slab penetrating portion 12, the straight pipe of the upper drainage stack leaving the predetermined dimension H1 from the slab floor surface 2 as in the processing of the slab penetrating portion 11. Remove the part.
Hereinafter, the slab penetration part 11 of this floor is demonstrated.

In a connection part renovation process (C), the new pipe | tube 13b is added to the part removed by the cutting process. That is, the new straight pipe 13b is connected after the epoxy resin film is formed on the slab penetrating part 11 (and / or 12), and the process of the present invention is completed.
In this case, the straight pipe cut out from the existing drainage standpipe may be renewed in parallel and reused instead of the new pipe. It is preferable to connect.

  It is preferable to repeat the cutting process (A), the penetration part renovation process (B), and the connection part renovation process (C) described above sequentially or in parallel from any floor.

According to the above rehabilitation method, it can be constructed in about 4 hours from preparation to clean-up, and the rehabilitation work of the drainage stack 10 is completed in about 2 hours. For this reason, when the drainage stack is rehabilitated particularly in an apartment house, the restriction on prohibition of use of the drainage stack can be limited to about 2 hours, so that the residents of the apartment house can renew the drainage pipe while living.
In addition, since there is no restriction such as from the upper floor or from the lower floor and only a predetermined floor can be constructed as a single process, it can be carried out sequentially in accordance with the convenience of the resident of the apartment house.

The method for forming the epoxy resin film in the through-part renovation step (B) may be a cylindrical cloth sheet impregnated with an epoxy resin, or may be a spray coating method.
Hereinafter, a method of forming a film with a cylindrical cloth sheet impregnated with a liquid epoxy resin will be described.

FIG. 2 is a configuration diagram of a penetration portion regenerator used in the present invention. The penetrating part rehabilitation tool 20 includes a cylindrical cloth sheet 21 including a penetrating part 21a and a branch pipe part 21b, and a flexible liquid-tight bag 22 for accommodating the sheet.
The tubular cloth sheet 21 is a cloth sheet that can be impregnated with a liquid epoxy resin. The cloth sheet is made of cloth made of fibers (for example, glass fibers or polyester fibers) for reinforcing the epoxy resin, and is formed in a cylindrical shape. Moreover, the penetration part 21a is shape | molded by the cylinder shape closely_contact | adhered to the inner surface of the slab penetration part 11 mentioned above, and the branch pipe part 21b is shape | molded by the cylinder shape corresponding to the branch pipe connected to the slab penetration part 11. FIG. The penetration part 21a and the branch pipe part 21b are continuously connected. That is, the branch pipe portion 21b is branched corresponding to the branch pipe branched from the drainage stack. The tubular cloth sheet (through portion 21a) corresponding to the drainage stack is partially drilled, and the tubular cloth sheet corresponding to the branch pipe portion 21b is sewn. In addition, the short part of the branch pipe part 21b is opened.

The flexible liquid-tight bag 22 is a bag made of, for example, a vinyl sheet and covers the entire tubular cloth sheet 21 in a liquid-tight manner, and only the upper end is opened in this figure. That is, the tubular cloth sheet 21 is placed in a tubular vinyl sheet having the same shape as the tubular cloth sheet 21.
In this figure, two toroidal vinyl sheets are stacked, the side edges of the sheets are heated and fused together to form a cylinder, and it is closed except for providing an opening at one end of the cylinder. It is in the shape of a bag. The vinyl sheet is preferably transparent.

FIG. 3 is an explanatory view showing a penetration portion renovation process in the present invention using the penetration portion rehabilitation tool 20.
Below, a construction method is demonstrated with reference to this figure.

First, a liquid epoxy resin is poured from the opening 22a of the liquid-tight bag 22 (cylindrical vinyl sheet) in FIG. 2, and the epoxy resin is applied to the entire tubular cloth sheet 21 so as to be pressed from above the cylindrical vinyl sheet. Fully impregnated. The epoxy resin is preferably a two-part epoxy resin.
In this case, if the vinyl sheet is transparent, the impregnation state of the epoxy resin into the tubular cloth sheet 21 can be confirmed.

Next, as shown in FIG. 3 (A), the opening 22a of the cylindrical vinyl sheet 22 and the tubular cloth sheet 21 are placed over the opening of the slab penetrating part 11 (remaining piping), and then as shown in FIG. 3 (B). Then, the tubular cloth sheet 21 is inserted into the slab penetrating portion 11 while being inverted.
As shown in FIG. 3 (B), the tubular vinyl sheet 22 containing the tubular cloth sheet 21 is inserted into the existing pipe (slab penetrating portion 11) while being inverted so that the tubular cloth sheet 21 faces outward. Therefore, the cylindrical cloth sheet 21 impregnated with the epoxy resin adheres to the inner surface of the existing piping, and the bag-shaped cylindrical vinyl sheet 22 is contained therein.

Next, when air is injected from the opening of the bag-shaped cylindrical vinyl sheet 22, the bag-shaped cylindrical vinyl sheet 22 spreads like a balloon as shown in FIG. The cloth-made sheet 21 is brought into close contact with the inner surface of the pipe.
The cylindrical cloth sheet 21 impregnated with the epoxy resin is brought into close contact for a predetermined time, and when the epoxy resin is almost solidified, the bag-shaped cylindrical vinyl sheet 22 is evacuated, and the bag-shaped cylindrical vinyl sheet is pulled out and installed. When the resin layer protruding from the opening of the pipe 11 is cut out and then the epoxy resin is completely solidified, the process is completed.

When the cylindrical cloth sheet 21 impregnated with the epoxy resin is used, not only the resin layer can be formed with a predetermined thickness by the cloth sheet, but also the presence of the cloth sheet exhibits the same effect as that of so-called resin fiber reinforcement. Excellent durability. Moreover, since it crimps | bonds with a cylindrical vinyl sheet, not only the resin layer firmly adheres to the pipe inner surface, but the surface of the resin layer is formed smoothly.
In addition, since a cylindrical cloth sheet having a shape corresponding to the shape of the branch pipe is used, it becomes easy to cope with a complicated pipe shape, which has been a problem in the resin layer formation using a conventional sheet.

FIG. 4 is another explanatory view showing the penetration portion renewal process in the present invention, and shows another embodiment relating to the method of forming the resin layer.
This example is suitable when the branch pipe in the dwelling unit is also replaced with a new pipe, but the construction procedure is almost the same as the above-described example, and the difference is in the shape of a cylindrical vinyl sheet. That is, two straight cylindrical vinyl sheets 24 and 25 having different diameters are used.
As shown in FIGS. 4 (A) and 4 (B), a toroidal cylindrical cloth sheet 23 impregnated with an epoxy resin is inserted into the remaining pipe (slab penetrating portion 12), and first a branch pipe A cylindrical vinyl sheet 25 is put into the container and air is injected. Next, the cylindrical vinyl sheet 23 is put in the slab penetration part 12, and air is inject | poured.
This example is characterized by simply using straight cylindrical vinyl sheets 24 and 25, but is effective when there are two or more branch pipes in the slab penetrating portion 12.
That is, in the example of FIG. 3, a tubular cloth sheet or a tubular vinyl sheet is formed in accordance with the shape of the slab penetrating portion 12 including the branch pipe, but when there are two or more branch pipes, the tubular cloth sheet Although it is not so difficult to form, the formation of the cylindrical vinyl sheet takes time. In this example, the trouble is eliminated.

In addition, the insertion of the toroidal tubular cloth sheet 23 into the remaining pipe in this embodiment was performed by a method different from the reverse insertion described above.
That is, in a situation where the straight pipe portion of the drainage stack is removed from each of the slab floor surface 1 and the slab floor surface 2 while leaving the predetermined dimension H1, epoxy resin is applied to the toroidal tubular cloth sheet 23 on the slab floor surface 1. Then, a toroidal tubular cloth sheet 23 was inserted from below the slab penetrating portion 12 from the slab floor surface 2 by a guide wire.
The guide wire means a string-like body hung down from the upper opening 12a of the slab penetrating part 12 and the branch pipe connection port 12b in the slab penetrating part 12 toward the lower floor. The slab penetrating portion 12 is connected to the upper opening corresponding portion and the branch pipe connection port corresponding portion, and the guide wire is pulled from the slab floor surface 2 so that the toroidal tubular cloth sheet 23 is formed. It fits in the slab penetration part 12.
This facilitates the insertion of the cylindrical vinyl sheet 25 that is inserted into the branch pipe.
In this case, not only the current floor of the drainage stack to be rehabilitated but also a step of cutting and removing the straight pipe of the drainage stack on the lower floor is added.

FIG. 5 is an explanatory view showing a connecting portion rehabilitation process in the present invention.
In the connecting part rehabilitation process, when a new pipe is added to the part removed in the cutting process, the connection between the existing pipe (slab penetrating parts 11 and 12) and the new straight pipe 13b is made by connecting the cylindrical elastic rubber body 14 to the pipe. The steel band 15 is preferably fastened and fixed.
For example, a cylindrical elastic rubber body 14 and a steel band 15 are attached to the end of a new straight pipe 13b, and the steel band 15 is shifted from a predetermined position as shown in FIG. After that, the pipe 13b is placed at a predetermined position as shown in FIG. 5 (B), and the steel band 14 folded back as shown in FIG. 5 (C) is extended, and the steel band is attached at the normal position. Tighten and fix.
Further, the end edge of the pipe is subjected to rust prevention treatment in advance.

  As described above, according to the present invention, even when the length of the drainage stack arranged through the slabs of the plurality of floors is long, or when the horizontal branch pipe is connected to the drainage stack, The resin layer can be easily formed in a uniform thickness on the inner surface of all the pipes including the branch pipes in a short time without trouble.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously, unless it deviates from the summary of this invention.

It is a schematic diagram which shows the regeneration method of the drainage stack of this invention. It is a block diagram of the penetration part renovation tool used by this invention. It is explanatory drawing which shows the penetration part renovation process in this invention. It is another explanatory drawing which shows the penetration part renovation process in this invention. It is explanatory drawing which shows the connection part renovation process in this invention. It is explanatory drawing of "the correction method of a drainage vertical pipe" of patent document 1. FIG. 10 is an explanatory diagram of “pipeline repair method” in Patent Document 2. FIG. 10 is an explanatory diagram of “pipe lining method” in Patent Document 3. FIG.

Explanation of symbols

1, 2 concrete slab, 1a, 2a slab floor, 2b slab ceiling,
10 Drainage pipe, 11, 12 Slab penetration part, 13a Connection part, 13b New straight pipe,
14 cylindrical elastic rubber body, 15 steel band,
20 penetration part rehabilitation tool, 21 cylindrical cloth sheet, 21a penetration part, 21b branch pipe part,
22 Flexible liquid-tight bag (cylindrical vinyl sheet), 22a Opening 23 Cylindrical cloth sheet, 24, 25 Cylindrical vinyl sheet,

Claims (3)

A method of rehabilitating a drainage stack disposed through a concrete slab that constitutes a slab floor surface of a plurality of floors,
Cutting the drainage stack between the floor to be rehabilitated and the upper floor at a predetermined position from the slab floor surface of the current floor and at a predetermined position from the slab ceiling surface of the upper floor, and removing the connecting portion therebetween Process,
After the inner surface of the slab penetration part of the drainage stack remaining on the slab floor surface of the current floor and / or the slab ceiling surface of the upper floor is polished and washed, a penetration part renovation step of forming an epoxy resin film on the inner surface,
The removed portion in the cutting step, and a connecting portion retreading process annex a new tube, Ri Tona,
In the penetration part rehabilitation process,
Prepare a tubular cloth sheet having a penetrating part and a penetrating part renewal tool comprising a flexible liquid-tight bag containing the sheet and containing only one end,
From the open end of the liquid-tight bag, a liquid epoxy resin is poured, and the entire tubular cloth sheet is impregnated with the epoxy resin,
Cover the opening end of the liquid-tight bag and the tubular cloth sheet over the opening of the remaining slab penetrating part, and insert the tubular cloth sheet into the slab penetrating part while inverting it,
A method for rehabilitating a drainage standpipe , wherein air is injected from an opening end of the liquid-tight bag, the liquid-tight bag is spread, and a tubular cloth sheet impregnated with an epoxy resin is brought into close contact with the inner surface of the pipe . 2. The drainage stack rehabilitation method according to claim 1 , wherein the tubular cloth sheet has a branch pipe portion corresponding to a branch pipe connected to a slab penetrating portion of the drainage stack pipe.   The drainage stack rehabilitation method according to claim 1, wherein the cutting step, the penetration portion renewal step, and the connection portion rehabilitation step are repeated sequentially or in parallel from any floor.

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