JP6966345B2 - Sealing method and sealing structure of pipe joints - Google Patents

Description

The present invention relates to a method and a structure for sealing a joint portion of a pipe.

At the joint between pipes and the joint between pipes and equipment such as valves, a gasket interposed between the flanges prevents water leakage from the joint. Maintenance and inspection are carried out on the assumption that the water blocking function of the gasket will deteriorate due to deterioration of the gasket or loosening of the flange fastening due to an earthquake, but even stricter measures against water leakage may be required. In such a case, it is common to apply a putty-like water blocking material to the joint portion to cover the entire joint portion.

In the sealing structure proposed in Patent Document 1, a water-stopping material obtained by gelling a high-concentration starch solution is applied to the joint part to form a dumpling to cover the joint part, and the water-stopping material is surrounded by a transparent case. ing. This water blocking material can expand due to water leakage, enhancing the water leakage prevention function.

Japanese Unexamined Patent Publication No. 8-296789

In the above-mentioned two sealing structures, it takes skill to apply the waterproof material to the joint part without any gap, and according to an inexperienced worker, the adhesion between the joint part and the sealing material cannot be ensured, and the water leakage is reliable. It may not be possible to exert the preventive function.

The present invention has been made to solve the above problems, and in a method of sealing a joint portion of a pipe, the present invention has been made.
The process of providing a formwork so as to pass through the above pipes and surround the above joints,
A step of stirring and mixing a main agent composed of a resin emulsion and a curing agent containing isocyanate to obtain a fluid mixture.
The process of pouring the above-mentioned mixture into the above-mentioned mold in an atmospheric pressure environment,
A step of obtaining a gel-like encapsulant covering the joint portion by gelling the mixture, and
It is characterized by being equipped with.

According to the above method, the fluid mixture obtained by stirring and mixing the main agent and the curing agent is poured into the mold in an atmospheric pressure environment, so that the conventional painting work requiring skill can be omitted. It is possible to easily make a sealed body having a high sealing function with good workability. Further, since the gel-like encapsulant has elasticity, it can follow the thermal expansion and contraction of the pipe and the joint portion, and is not torn or damaged, so that the encapsulation function can be maintained for a long period of time. Further, even if there is a leak from the joint portion, the sealed body can be elastically deformed and received, and the leak to the outside can be avoided.

Preferably, the formwork is made of foamed resin.
According to the above method, it is possible to easily and inexpensively make a formwork according to the shape and size of the pipe and the joint portion. In addition, since the mold acts as a heat insulating agent, the mixture can be stably gelled.

Preferably, the main agent is obtained by emulsifying a petroleum resin and an acrylic resin into water with polyvinyl alcohol.
More preferably, the resin solid content in the main agent is 47.5 to 49 w%, and the water content is 51 to 52.5 w%.
According to the above method, since the resin solid content of the main agent is 49 w% or less, the fluidity of the mixture can be increased, and even if the outer shape of the joint portion is complicated, the mixture is applied to the outer surface of the joint portion. It can be surely reached. Further, since the resin solid content of the main agent is 47.5 w% or more, appropriate elasticity of the final product encapsulant can be obtained, and a good encapsulation function can be ensured.

Preferably, the curing agent contains a curing agent A that slowly cures the main agent and a curing agent B that can cure the main agent in a shorter time than the curing agent A, and the curing agent is first added to the main agent. A is added and stirred and mixed, and then the curing agent B is added and stirred and mixed to obtain the above-mentioned mixing agent.
According to the above method, the mixed agent can be stably gelled, and the gelation time can be shortened.

Preferably, immediately after the step of pouring the mixture into the mold and / or immediately after the pouring step, the vibrator is immersed in the mixture to give vibration to the mixture.
According to the above method, even if a boundary is generated between the portion poured first and the portion poured later when the mixture is poured, the boundary can be eliminated by applying vibration to the mixture. It is possible to prevent the sealed body, which is the final product, from being cracked or the like. In addition, it is possible to promote the discharge of the air mixed in during stirring and mixing and the gas generated by gelation from the mixture, and the gelation can be uniformly performed.

More preferably, in the step of pouring the mixture into the mold, the vibrator is applied to the mold in a state of being immersed in the mixture to give vibration to the mold.
According to the above method, by applying vibration to the mold, it is possible to apply vibration to the mixture in a wide range.

More preferably, immediately after the step of pouring the mixture, vibration is applied to the mixture by moving the vibrator in parallel while immersing it in the mixture, at least in the region above the joint portion.
According to the above method, in the final product, the sealed body, it is possible to reliably prevent a rift in the upper region of the joint portion.

Preferably, after the sealing body is completed, the upper end opening of the mold is covered with a foamed resin lid. According to this method, the gel-like encapsulant can be protected in a state of being insulated from the outside by the mold and the lid, and freezing of the encapsulant can be prevented.
More preferably, an adhesive tape containing an aluminum layer and a resin layer is attached to the outer surface of the sealing body and the lid, and the upper surface of the sealing body is covered with a resin film before being covered with the lid. According to this method, the adhesive tape can block ultraviolet rays, and the resin film can prevent the evaporation of water, so that the useful life of the sealed body can be extended.

Another aspect of the present invention is a structure for sealing a joint portion of a pipe.
Ah. A foamed resin case provided so as to pass through the above pipe and surround the above joint portion, and
stomach. In the case, an elastic and flexible gel-like sealing body filled between the case, the joint portion and the piping, and
It is characterized by being equipped with.
Preferably, the sealant comprises a petroleum resin, an acrylic resin and a polyurethane.

According to the present invention, the joint portion can be reliably and long-term sealed with a simple operation.

It is a vertical cross-sectional view which shows the state which installed the formwork so as to surround the pipe joint part in the sealing method of the pipe joint part which form the 1st Embodiment of this invention. It is the figure which looked at the installation process of the formwork from the axial direction of a pipe, (A) is the state which the formwork main body and the formwork auxiliary piece are separated, (B) is the formwork auxiliary piece in the formwork main body. The state in which the above-mentioned formwork is completed by fitting is shown. It is a vertical sectional view which shows the stirring apparatus for making a mixture by stirring and mixing a main agent and a curing agent in the said sealing method. It is a vertical cross-sectional view of a main part of FIG. 1, (A) is a state where the said mixture is poured into the said mold, (B) is a state where gelation of the said mixture is completed, (C) is the above-mentioned mold. The state where the sealing structure is completed by covering the upper end opening of the frame is shown. It is a vertical sectional view which shows the sealing structure of the joint part of a pipe and a valve which concerns on 2nd Embodiment of this invention. It is a vertical sectional view which shows the sealing structure of the joint part of the vertical pipe which concerns on 3rd Embodiment of this invention.

Hereinafter, a method for sealing the pipe joint portion according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
Piping structure As shown in FIG. 1, the piping structure of the present embodiment includes pipes 1 and 2 extending substantially horizontally and a joint portion 3 connecting these pipes 1 and 2. The joint portion 3 is configured by connecting the flanges 1a and 2a formed at the ends of the pipes 1 and 2 with the bolt and nut fastening means 6 with the gasket 5 interposed therebetween. The pipes 1 and 2 are supported on the floor or the ground via the support 7.

Installation of Formwork As shown in FIG. 1, a formwork 10 made of styrofoam (made of foamed resin) having an open upper end is installed so as to surround the joint portion 3 through pipes 1 and 2. As shown in FIGS. 1 and 2, the formwork 10 has a formwork main body 11 and two formwork auxiliary pieces 15.

The formwork body 11 joins the lower ends of two curved plates 12 having a J-shaped cross section to form a curved plate having a U-shaped cross section, and both ends of the curved plate having a U-shaped cross section (axial directions of pipes 1 and 2). It is pre-assembled by joining two flat plate-shaped side plates 13 to the inner circumference of (both ends). Screws, caulking materials, etc. are used for the above joining.

The two side plates 13 of the formwork body 11 each have a notch 14. The notch 14 has a lower edge 14a having a concave shape of a semicircle and two side edges 14b extending vertically and linearly from both ends of the lower edge 14a, and the upper end thereof is open. A groove 14x having a V-shaped cross section is formed on the side edge 14b along the side edge 14b. An adhesive sheet (not shown) composed of a plurality of aluminum layers and a plurality of resin layers is attached to the entire outer surface of the mold body 11. The adhesive sheet enhances the mechanical strength of the entire formwork body 11.

The formwork body 11 is installed so that the lower edge 14a having a semicircular arc shape of the notch 14 is in contact with the lower half of the outer peripheral surfaces of the pipes 1 and 2. The formwork body 11 is supported on the floor or the ground by the table 8. In this installed state, the formwork main body 11 passes through the pipes 1 and 2 and accommodates the joint 3.

The formwork auxiliary piece 15 has the same width as the notch 14 of the formwork body 11, its lower edge 15a has a concave shape of a semicircle, and its side edge 15b forms a linear shape and extends vertically. .. A ridge 15x having a V-shaped cross section is formed on the side edge 15b along the side edge 15b. An adhesive sheet is attached to the outer surface of the formwork auxiliary piece 15 in the same manner as the formwork main body 11.

As shown in FIG. 2 (A), by moving the two formwork auxiliary pieces 15 downward, as shown in FIG. 2 (B), the formwork auxiliary piece 15 makes a notch 14 of the formwork main body 11. It is assembled to the formwork body 11 so as to close it. In this assembled state, the lower edge 15a of the formwork auxiliary piece 11 abuts on the upper half of the outer peripheral surfaces of the pipes 1 and 2, and the ridge 15x is inserted into the groove 14x of the notch 14.

After assembling the formwork auxiliary piece 15 , an adhesive tape is wound so as to straddle the outer periphery of the pipes 1 and 2 and the formwork main body 11 and the formwork auxiliary piece 15, and a caulking material is applied to complete the formwork 10. In addition, these treatments may be carried out after curing which will be described later.

As described above, since the formwork 10 is made of styrofoam, it can be easily made according to various shapes and sizes of the pipes 1 and 2 and the joint portion 3. Further, by surrounding the pipes 1 and 2 with the lower edge 14a of the notch 14 of the formwork main body 11 and the lower edge 15a of the formwork auxiliary piece 15, the pipes 1 and 2 can be easily passed through the formwork 10. Can be done.

Next, the main agent made of a resin emulsion, which is a raw material used for sealing the joint portion 3, and the two types of curing agents A and B containing isocyanate will be described in detail.
Main agent The main agent of the present embodiment is obtained by emulsifying petroleum resin (mainly C9 series) and acrylic poval (acrylic resin) into water with polyvinyl alcohol. More specifically, it is obtained by mixing the following raw materials.
Petroleum resin: 38-43 wt%
Acrylic Poval Emulsion: 10-13 wt%
Polyvinyl alcohol: 2-4 wt%
Water: 42-49 wt%
Polyvinyl alcohol forms a protective colloid that surrounds about 1 μm of petroleum resin fine particles and about 0.1 μm of acrylic poval fine particles.
It is preferable that the total resin solid content in the main agent is 47.5 to 49 w% and the total water content is 51 to 52.5 w%. The reason why the resin solid content is 49 w% or less is to ensure high fluidity when pouring into the mold 10 and to allow the resin solid content into the complicated shape of the joint portion 3 as described later. The reason for setting it to 47.5% or more is to impart an elastic modulus of a predetermined value or more to the sealed body obtained by gelation described later, and to exert a sufficient water blocking function.

Hardener A
The curing agent A has the following composition.
Polyoxyethylene / polyoxypropylene condensate: 52-63 wt%
γ-Butyrolactone: 18-22 wt%
2,4-Tolylene diisocyanate: 9.5 to 12.0 wt%
2,6-tolylene diisocyanate: 2,5-3.0 wt%
The curing agent A has a slow rate of curing the main agent, and when the curing agent A is used alone, it takes about 4 days to complete the gel-like encapsulant described later.

Hardener B
The curing agent B has the following composition.
Urethane prepolymer mainly composed of polyisocyanate: 50-70w%
Polymethylene polyphenyl polyisocyanate (polymeric MDI): 5-15w%
The organic acid ester curing agent B cannot be used alone. The curing agent B has a significantly faster curing rate than the curing agent A, and when it is mixed alone with the main agent A, the curing proceeds explosively, and a gel-like sealed body cannot be obtained. The curing agent B plays a role of promoting gelation of the main agent in cooperation with the curing agent A.

Stirrer As shown in FIG. 3, the stirrer 20 includes a water tank 21, a stirrer 22 and a stirrer 25 as main components.
A support base 23 is installed in the water tank 21. The support base 23 has an annular collar 23a. A pump 24 for stirring the water in the water tank 21 is installed on the support base 23.

The annular collar 22a formed on the body of the stirring tank 22 is mounted on the collar 23a of the support base 23, so that the stirring tank 22 is detachably supported on the support base 23 while floating from the bottom of the water tank 21. .. A plurality of convex portions 22b are formed on the inner circumference of the stirring tank 22 at intervals in the circumferential direction.

The stirrer 25 is provided at a disk-shaped base 25a, a motor 25b installed in the center of the upper surface of the base 25a, a rotary shaft 25c extending downward through the central portion of the base 25a, and a lower portion of the rotary shaft 25c. It also has an agitator 25d.

A stand 26 is detachably placed on the upper end of the stirring tank 22. A bearing portion 26a is formed in the central portion of the stand 26, and the rotary shaft 25c of the stirrer 25 is rotatably inserted into the bearing portion 26a so as to be movable in the axial direction (vertical direction).

The raw materials in the stirring tank 22 are stirred and mixed by the cooperation of the rotating agitator 25d and the plurality of convex portions 22b protruding from the inner circumference of the stirring tank 22. At this time, by holding the base 25a of the stirrer 25 and moving the stirrer 25 up and down, the stirring and mixing effect can be enhanced.

The stirring tank 22 is set in the stirring mixing water tank 21 of the main agent and the curing agent, and the stirring machine 25 is set in the stirring tank 22. First, the main agent is put into the stirring tank 22, and the stirrer 25 is driven to pre-stir the main agent. The stirring time is about 10 seconds.
Next, the curing agent A and the diluted water are mixed in a separate container using a spatula or the like, and the mixture is stirred for about 30 seconds while being put into the stirring tank 22, and the main agent and the diluted curing agent A are mixed.
Next, the curing agent B is stirred for about 45 seconds while being put into the stirring tank 22, and the curing agent B is mixed with the main agent and the curing agent A.

Mixing ratio The mixing ratio is 4.5 to 5.5 parts by weight, more preferably 5 parts by weight, diluted water 2 parts by weight, and curing agent B 2.7 parts by weight with respect to 10 parts by weight of the main agent. ~ 3.3 parts by weight, more preferably 3 parts by weight.

Temperature control during stirring The temperature of the raw material during stirring is controlled so as to maintain the range of 5 to 20 ° C. This is because gelation cannot be stably performed at temperatures below 5 ° C and above 20 ° C. When the environmental temperature (the temperature of the main agent and the curing agents A and B before stirring) is out of the above temperature range, the water tank 21 is filled with water and the pump 24 is operated to stir the water. In this state, if the water temperature is less than 5 ° C, a heater (not shown) is placed in the water tank 21 to heat the water, and if the water temperature exceeds 20 ° C, a cooler is placed in the water tank 21 to cool the water. do. Thereby, the temperature of the raw material in the stirring tank 22 is controlled so as to be within the above temperature range.

Pour of Mixing Agent Immediately after the stirring and mixing is completed, the mixing agent 30 obtained by mixing is poured into the mold 10 as shown in FIG. 4 (A). Since the mixture 30 has high fluidity, it is filled without gaps along the complicated shape of the joint portion 3 even in an atmospheric pressure environment. Further, since it is not poured due to the high pressure, the foamed styrene mold 10 can receive the mixing agent 30 without being destroyed.
In the present embodiment, the filling level of the mixture 30 is higher than the upper end of the joint portion 3 and lower than the upper end of the mold 10. The reason why the temperature is lower than the upper end of the mold 10 is to improve the attachment of the lid as described later, but the mixture 30 may be filled up to the upper end of the mold 10.

Vibration application Vibration is applied to the mixture 30 from the middle of pouring the mixture 30. Specifically, a rod-shaped vibrator 40 ( shown by an imaginary line in FIG. 4A ) is immersed in the mixture 30 and applied to the inner circumference of the mold 10 to give vibration. The mixing agent 30 receives vibration directly from the vibrator 40 and also receives vibration over a wide range due to the vibration of the mold 10.

It is preferable that the vibration is applied evenly in the circumferential direction of the mold 10. When the planar shape of the formwork 10 is rectangular as in the present embodiment, the distance between the inner side surface thereof and the joint portion 3 is narrow, and there is a space for accommodating the vibrator 40 at the four corners, the vibrator 40 is rotated. It is moved to the four corners in order along the direction, and vibration is applied to the mold 10 at these corners. However, when the vibrator 40 moves from one corner to another, it is not removed from the mixing agent 30 and is moved while the lower end portion is immersed in the mixing agent 30. This is to avoid air contamination.
In the present embodiment, when the vibrator 40 goes around the inner circumference of the mold 10, it stands still at each of the four corners for about 6 seconds to apply vibration, and this is performed for two rounds.
The vibration application ends at about the same time as the time when the pouring of the mixing agent 30 is completed. The vibration may be applied until after the pouring is completed.

After the pouring of the mixing agent 30 is completed, with the vibrator 40 shallowly immersed in the mixing agent 30, at least the upper region of the joint portion 3, preferably the entire area, is translated in a zigzag manner on the upper surface of the mixing agent 30 to about 25. Vibration is applied to the mixture 30 for a second.

When the mixing agent 30 is poured, a boundary is formed between the portion poured first and the portion poured later, and a rift may be formed along this boundary after gelation described later. However, in the present embodiment, since the mixture 30 is vibrated to eliminate the boundary, it is possible to avoid the formation of crevices after gelation.
Further, by applying vibration, it is possible to promote the discharge of the air mixed in during stirring and mixing and the gas generated by the gelation reaction from the mixture 30, and the gelation can be uniformly and stably performed.

Curing After applying vibration, cure for 2 to 3 days. In the curing step, a cloth is put on the mixture 30 and a breathable ultraviolet ray cut cover is put on the mixture. Moisture floating on the upper surface of the mixture 30 is absorbed by a cloth and released as vapor from the ultraviolet cut cover. By blocking ultraviolet rays with an ultraviolet cover, deterioration of the mixture 30 can be prevented. Since the mold 10 is made of Styrofoam and can be insulated from the external environment, stable curing can be performed.

The mixing agent starts gelling when the main agent and the curing agent are mixed, and gelation proceeds in the pouring step and the curing step of the mold material 10. Briefly, the water in the main agent reacts with the isocyanates of the curing agents A and B to form polyurethane, and the protective colloid of polyvinyl alcohol is lost due to this water absorption, and the petroleum resin and the fine particles of acrylic poval are melted. To wear. As a result, the gelled sealed body 50 shown in FIG. 4 (B) is completed. The sealing body 50 is a gel-like object containing petroleum resin, acrylic poval, and polyurethane, has appropriate elasticity and flexibility, and elastically deforms when pressed with a finger.

Finishing After the above curing, as shown in FIG. 4B, the upper surface of the sealing body 50 is covered with a resin film, and then glass wool is formed in the shallow recess formed by the upper surface of the sealing body 50 and the upper end portion of the mold 10. The heat insulating material 52 such as the above is laid, and further covered with a styrofoam lid 54 as shown in FIG. 4 (C). An annular low convex portion 54a is formed on the lower surface of the lid 54, and the lid 54 can be stably attached by fitting the convex portion 54a on the inner circumference of the upper end of the mold 10.
The above-mentioned adhesive sheet is attached to the upper surface of the lid 54 so as to protrude from the peripheral edge thereof, and the finishing step is completed by attaching the protruding portion of the adhesive sheet to the outer periphery of the upper end portion of the mold 10.

Completed sealing structure The sealing structure is completed as described above. Even if the water blocking function of the gasket 5 of the joint portion 3 is deteriorated, water leakage from the joint portion 3 can be prevented by the gel-like sealing body 50 in close contact with the joint portion 3. Since the sealing body 50 has elasticity, it can follow the thermal expansion and contraction of the joint portion 3 and the pipes 1 and 2, and good water stopping performance can be ensured for a long period of time. Further, even if water leaks from the joint portion 3, it can be prevented from leaking to the outside by accepting the water leakage due to the elasticity of the sealing body 50.

The mold 10 and the lid 54 can be used as they are as the case S, and hold the sealing body 50. The heat insulating action of the case S can prevent the sealing body 50 from freezing and thus the fluid passing through the joint. Further, the resin film covering the upper surface of the sealing body 50 can prevent the evaporation of water in the sealing body 50, and the adhesive tape of the aluminum layer and the resin layer covering the outer surfaces of the mold 10 and the lid 54 blocks ultraviolet rays. Therefore, deterioration of the sealing body 50 can be suppressed and the service life thereof can be extended.

Maintenance and inspection of the joint portion When the joint portion 3 is regularly maintained and inspected, for example, every few years, the sealing structure can be easily removed from the joint portion 3. That is, the adhesive tape is cut, the lid 54 is removed, and the mold 10 is removed from the sealing body 50. The gel-like sealing body 50 can be manually torn by making a notch with a cutting tool, and can be easily removed from the joint portion 3.

Next, another embodiment of the present invention will be described with reference to the drawings. In these embodiments, the components corresponding to the first embodiment are designated by the same number, and detailed description thereof will be omitted.
In the second embodiment shown in FIG. 5, the valve 4 is interposed between the pipes 1 and 2. The valve 4 has a main body portion 4a, an operation portion 4b protruding upward from the main body portion 4a, and a pair of flanges 4c and 4d formed at the tip of a portion horizontally protruding from the main body portion 4a. ..

The joint portion 3A is formed by connecting one flange 4c of the valve 4 and the flange 1a of the pipe 1 via the gasket 5. The joint portion 3B is formed by connecting the other flange 4d of the valve 4 and the flange 2a of the pipe 2 via the gasket 5.

The formwork 10 is formed in the same manner as in the first embodiment, but has a size for accommodating the main body portion 4a of the valve 4 and the two joint portions 3A and 3B, and has a rectangular planar shape. The operation portion 4b of the valve 4 projects upward from the upper end of the mold 10.

The flowable mixture obtained by stirring and mixing the main agent and the curing agents A and B is poured into the mold 10 and gelled to obtain the sealed body 50, which is the same as in the first embodiment. As a result, the main body portion 4a of the valve 4 and the joint portions 3A and 3B are covered with the sealing body 50, but the operating portion 4b of the valve 4 is not covered with the sealing body 50.

After curing, the lids 54A and 54B divided into two are put on both ends in the longitudinal direction of the upper end opening of the mold 10. The longitudinal intermediate portion of the upper end opening of the formwork 10 in which the operation portion 4b of the valve 4 is arranged is opened and closed by the opening / closing lid 54C (lid) supported by the formwork 10 so as to be openable and closable by the hinge 55. There is. The opening / closing lid 54C is made of sheet metal, but is insulated by a styrofoam lining. When opening and closing the valve 4, the opening / closing lid 54C is opened to expose the operating portion 4b, and the handle is hung on the operating portion 4b to turn it.

In the third embodiment shown in FIG. 6, the pipes 1 and 2 are arranged vertically (vertically). The styrofoam formwork 10D is obtained by joining two semi-circular plate-shaped bottom plates 17 having a flat plate shape and two semi-circular curved plates 18. The two bottom plates 17 each have a semicircular notch 17a that fits into the pipe 2, and are joined to each other to form the bottom of the formwork 10D. The two curved plates 18 are joined to each other to form the body of the formwork 10D having a cylindrical shape concentric with the pipes 1 and 2. The lower end of the body is joined to the bottom.
The two lids 56 have the same shape as the bottom plate 17, and have a semicircular notch 56a that fits into the pipe 1.

In the third embodiment, when vibration is applied to the mixing agent, the vibrator is continuously moved along the circumferential direction while being in contact with the inner circumference of the body of the cylindrical mold 10D, thereby causing the mold 10D. It is preferable to give vibration to the.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

The present invention can be applied to a structure for sealing a joint portion of a pipe.

1, 2, Piping 3, 3A, 3B Fitting part 10, 10D Formwork 30 Mixture 50 Sealing body 54, 54A, 54B Lid 54C Opening / closing lid (lid)
56 Closure S case

Claims (9)

In the method of sealing the joint part of the pipe,
The process of providing a formwork so as to pass through the above pipes and surround the above joints,
A step of stirring and mixing a main agent composed of a resin emulsion and a curing agent containing isocyanate to obtain a fluid mixture.
The process of pouring the above-mentioned mixture into the above-mentioned mold in an atmospheric pressure environment,
A step of obtaining a gel-like encapsulant covering the joint portion by gelling the mixture, and
Equipped with
A joint portion sealing method comprising a step of pouring the mixture into the mold and / or immediately after the pouring step, immersing the vibrator in the mixture to give vibration to the mixture. The joint portion sealing method according to claim 1, wherein the formwork is made of foamed resin. The method for stopping water at a joint according to claim 1 or 2, wherein the main agent is obtained by emulsifying a petroleum resin and an acrylic resin into water with polyvinyl alcohol. The joint portion sealing method according to claim 3, wherein the resin solid content in the main agent is 47.5 to 49 w% and the water content is 51 to 52.5 w%. The curing agent contains a curing agent A that slowly cures the main agent and a curing agent B that can cure the main agent in a shorter time than the curing agent A.
The joint portion sealing according to claim 4, wherein the above-mentioned mixing agent is obtained by first adding the curing agent A to the main agent and stirring and mixing, and then adding the curing agent B and stirring and mixing. Method. Claims 1 to 1 , characterized in that, in the step of pouring the mixture into the mold, the vibrator is applied to the mold in a state of being immersed in the mixture to give vibration to the mold. 5. The method for sealing a joint portion according to any one of 5. Immediately after the step of pouring the mixture, at least in the region above the joint portion, the vibrator is translated while being immersed in the mixture to give vibration to the mixture. Item 6. The method for sealing a joint portion according to Item 6. In the method of sealing the joint part of the pipe,
The process of providing a formwork so as to pass through the above pipes and surround the above joints,
A step of stirring and mixing a main agent composed of a resin emulsion and a curing agent containing isocyanate to obtain a fluid mixture.
The process of pouring the above-mentioned mixture into the above-mentioned mold in an atmospheric pressure environment,
A step of obtaining a gel-like encapsulant covering the joint portion by gelling the mixture, and
Equipped with
A method for sealing a joint portion, which comprises covering the upper end opening of the mold with a foam resin lid after the completion of the sealing body. An adhesive tape containing an aluminum layer and a resin layer is attached to the outer surface of the sealing body and the lid, and the upper surface of the sealing body is covered with a resin film before being covered with the lid. Item 8. The method for sealing a joint portion according to Item 8.

Images