JP5973820B2 - Manufacturing method of seal structure - Google Patents

Description

  The present invention relates to a method for manufacturing a seal structure used for a tail seal of a shield machine, an entrance portion of a tunnel, and the like.

  The tail portion of the shield machine is equipped with a tail seal to prevent earth and sand, groundwater, backfill material, etc. from flowing into the shield machine.

As the tail seal, a brush type using a wire brush is generally used.
In the case of adopting a brush type, it is necessary to fill with a filler such as grease in order to ensure water stopping.

  However, if the grease is lost from the tail seal while the shield machine is being dug, a backfill material or earth and sand may enter the wire brush and solidify. If the backfilling material or the like is consolidated inside the tail seal, the flexibility of the tail seal is impaired and the water stop effect is reduced.

Therefore, for example, as shown in Patent Document 1, a tail seal structure in which a foamed resin is pre-injected into a wire brush is employed. According to this tail seal structure, it is possible to prevent the back-filling material and the like from entering the wire brush, so that the water resistance of the tail seal can be maintained.
In addition, the wire brush in which foamed resin was inject | poured may be employ | adopted also in entrance parts, such as a propulsion construction method.

In Patent Document 1, after the assembly of the shield machine, the following operations (1) and (2) are repeatedly performed to inject the foamed resin into the entire tail seal.
(1) The foamed resin is injected while covering the tip of the wire brush positioned at the lowest position.
(2) After the foamed resin injected into the wire brush has gelled, the shield machine is rotated by the injection width of the foamed resin.

Japanese Patent No. 3158019

In the method for injecting foamed resin of Patent Document 1, since it is necessary to rotate the shield machine every time the foamed resin is injected, work is troublesome and equipment becomes large.
In addition, since a joint of the foamed resin is formed along the tunnel axis direction, there is a concern about a decrease in water stoppage at the joint.

  This invention makes it a subject to propose the manufacturing method of the seal structure which can solve the said problem.

In order to solve the above-described problems, a manufacturing method of a seal structure according to the present invention includes a preparation step of covering an endless wire brush with a sheet, and an injection pipe penetrating the sheet in the circumferential direction of the wire brush. A first piping step for arranging a plurality of foams, and a first layer injection for forming a first resin layer by injecting a mixed resin for foamed resin from the injection pipe to the middle of the wire brush in the height direction. After confirming the process and the first resin layer gelled, a plurality of injection pipes are arranged in the circumferential direction of the wire brush so as to be staggered with respect to the arrangement of the injection pipes in the first piping process. A second piping step, and a second layer for forming a second resin layer by injecting the foamed resin mixture from the injection pipe arranged in the second piping step into the remaining portion of the wire brush Injection It is characterized in that it comprises a degree.

According to the manufacturing method of such a seal structure, since the joint of the foamed resin is not formed in the tunnel axis direction, it is possible to form a high-quality seal structure excellent in water blocking.
Moreover, since large-scale equipment for rotating the shield machine is not required, the workability is excellent.

In addition, the wire brush into which the foamed resin is injected has almost no volume change or alteration regardless of whether it is in water or in the air, so that the function is maintained for a long period of time. In addition, since the backfilling material does not enter the wire brush, the water stop effect is hardly lowered.
Therefore, according to the method for manufacturing a seal structure of the present invention, it is possible to provide a seal structure with high durability and a long life.

When an unfilled portion of the foamed resin mixture is confirmed, a supplemental injection step of injecting the foamed resin mixture into the unfilled portion may be performed. If it does in this way, it will become possible to manufacture a higher quality seal structure.
In addition, you may control the hardness of a foamed resin by employ | adopting the 3 liquid mixed type thing as the said liquid mixture for foamed resins.

  According to the method for manufacturing a seal structure of the present invention, a high-quality seal structure can be easily formed.

It is an elevation which desires a shield machine provided with the seal structure concerning the embodiment of the present invention from back. It is sectional drawing of the shield machine tail part in which the seal structure of FIG. 1 was installed. It is a fragmentary perspective view of the seal structure which shows the manufacturing method of the seal structure of this embodiment, Comprising: (a) is a preparatory process, (b) is a 1st layer injection | pouring process. It is a fragmentary perspective view of the seal structure which shows the manufacturing method of the seal structure following FIG. 3, (a) is a 2nd layer injection | pouring process, (b) is a demolding process.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.
In the present embodiment, a method for manufacturing the tail seal (seal structure) 1 of the tail portion of the shield machine M will be described (see FIG. 1).

  The tail seal 1 is disposed along the inner surface of the skin plate S as shown in FIG. As shown in FIG. 2, the tail seal 1 includes a wire brush 2 and a pair of leaf springs 3 and 3 disposed so as to sandwich the wire brush 2 from the front and rear.

The wire brush 2 is formed by bundling thin steel wires, and is formed in an annular shape (endless shape) along the inner surface of the skin plate S.
Note that the shape of the wire brush 2 is not limited to a circle, and may be set as appropriate according to the shape of the shield machine M, for example, formed in a rectangle.

As shown in FIG. 2, in this embodiment, three stages of tail seals 1, 1, 1 are arranged along the axial direction. The tail seal 1 disposed at the rear end (right side in the figure) is filled with foamed resin throughout the wire brush 2, and the tail seal 1 disposed in the middle includes only the rear (outside) half. Is filled with foaming resin. Foamed resin is not injected into the tail seal 1 disposed in the forefront (left side in the figure).
The number of stages of the tail seal 1 is not limited. Also, the filling method of the foamed resin is not limited. For example, the tail seals 1, 1 and 1 in all three stages may be filled with the foamed resin, or only the tail seal 1 at the end is filled. It may be. Moreover, the foaming resin may be filled in the entire wire brush 2 or may be partially filled.

  The tail seal manufacturing method of the present embodiment includes a preparation step, a first piping step, a first layer injection step, a second piping step, a second layer injection step, a supplemental injection step, and a demolding step. It has.

  The preparatory process is a process of installing a mold on the wire brush 2 after assembling the wire brush 2 on the tail portion of the shield machine M.

In the preparation process, first, the wire brush 2 is checked for the presence of moisture, dust, fats, and the like. If moisture, dust, oils or fats are found, remove them.
In addition, the surface of the leaf springs 3 and 3 is checked for dirt (such as oil adhesion). If dirt that interferes with the installation of the formwork (see FIG. 3A) is found, remove it.

  As shown in FIG. 3A, the mold is installed by covering the wire brush 2 sandwiched between the leaf springs 3 and 3 with a transparent sheet 4. Both ends of the transparent sheet 4 are fixed to the front and rear leaf springs 3 and 3, respectively. Here, when only a half (partial) of the rear side (outside) of the wire brush 2 is filled with foamed resin (middle tail seal 1 in FIG. 2), the iron plate 2a and the leaf spring in the wire brush 2 are used. 3, both ends of the transparent sheet 4 are fixed.

  In addition, the material which comprises a formwork does not necessarily need to be transparent. Further, if a sheet or a sticky tape is used as the sheet and is adhered to the wire brush 2, the installation work of the mold can be easily performed.

  In the preparation step, a foaming test of the foamed resin mixture is performed to determine the blending of the foamed resin mixture.

The blending of the foamed resin mixture is set so that the expansion ratio is in the range of 6 to 7 times.
In this embodiment, the time from the start of stirring of the foamed resin mixture to the start of foaming (cream time) is about 15 seconds, and the time from the start of stirring until foaming settles (rise time) is about 1 minute 30 seconds. The time from the start of stirring to the hardness enough to touch with a finger (tack-free) is about 2 minutes 30 seconds.

  The foam test shall be performed three times. Manufacture of the liquid mixture for foaming resin is performed by kneading and stirring B liquid to what A liquid and C liquid were previously stirred.

  As a result of the foaming test, when the average value of the three times is different from the above target value, confirmation of blending, increase / decrease of stirring time, etc. are performed.

A 1st piping process is a process of piping the injection pipe 5 which penetrates the transparent sheet 4, as shown in (b) of FIG.
In the first piping step, first, marking is performed on the transparent sheet 4. The marking interval (injection interval) is not limited, and is an interval at which the foamed resin can be injected into the entire circumferential direction of the wire brush 2.

  Next, a hole is made in the transparent sheet 4 at the marking position. In this embodiment, a hole is made using an injection pipe installation rod (not shown), but the method for forming the hole is not limited.

  When a hole is made in the transparent sheet 4, the installation depth of the injection pipe 5 is confirmed by an injection pipe installation rod, and the installation depth is marked on the injection pipe 5 based on this result.

  Next, the injection pipe 5 is inserted into the wire brush 2 to a predetermined installation depth using an injection pipe installation rod. When the injection pipe 5 is inserted to a predetermined depth, only the injection pipe installation rod is extracted from the wire brush 2 to complete the installation of the injection pipe 5. A plurality of injection pipes 5 are arranged at predetermined intervals with respect to the circumferential direction of the wire brush 2.

The first layer injection step is a step of forming the first resin layer 6 on the wire brush 2.
The first resin layer 6 injects the foamed resin mixture from each injection pipe 5 and permeates the foamed resin mixture over the entire circumference of the wire brush 2.

  In preparation of the foamed resin mixed liquid, first, the A liquid and the C liquid are stirred to form an AC mixed liquid. What is necessary is just to determine the mixing | blending of AC liquid suitably according to the result of a foaming test.

Next, B liquid is thrown into AC liquid mixture, and it stirs with a stirrer, and produces the liquid mixture for foaming resins.
When the B liquid reacts with the AC mixed liquid, the foamed resin mixed liquid foams. What is necessary is just to determine the mixing | blending of the liquid mixture for foamed resins suitably according to the result of a foaming test.

  Subsequently, the foamed resin mixture is put into an air gun cartridge (not shown), and the cartridge is set in an air gun (not shown).

After the cartridge is set in the air gun and the air gun is connected to the injection pipe 5, the air gun is activated and the foamed resin mixture is injected into the wire brush 2 from the tip of the injection pipe 5. In the present embodiment, the foamed resin mixed solution is injected up to the middle portion of the wire brush 2 in the height direction. In addition, the injection | pouring depth of the liquid mixture for foamed resins is not limited.
After the injection of the foamed resin mixture, the injection pipe 5 is pulled out.

  A 2nd piping process is a process of piping the injection pipe 5 for inject | pouring the liquid mixture for foamed resin with respect to the unfilled location of the wire brush 2, as shown to (a) of FIG.

In the second piping step, first, after confirming that the foamed resin mixture injected in the first layer injection step has gelled, the filling range is checked. The filling range is confirmed by a deep needle, visual inspection and palpation using an injection pipe installation rod.
In palpation, the leaf springs 3 and 3 are palpated while the filler (mixed liquid for foamed resin) generates heat. The confirmation result of the filling range is entered in the leaf springs 3 and 3.

When the filling range is confirmed, the injection amount and the injection position for the unfilled range are confirmed.
Subsequently, the transparent sheet 4 is marked with a predetermined injection interval. The injection interval is not limited, but is set to be the arrangement of the injection pipe 5 and the staggered arrangement in the first piping step.

  Next, a hole is made in the transparent sheet 4 at the marking position. In this embodiment, a hole is made using an injection pipe installation rod, but the method for forming the hole is not limited.

  When a hole is made in the transparent sheet 4, the installation depth of the injection pipe 5 is confirmed by an injection pipe installation rod, and the installation depth is marked on the injection pipe 5 based on this result.

  Next, the injection pipe 5 is inserted into the wire brush 2 to a predetermined installation depth using an injection pipe installation rod. When the injection pipe 5 is inserted to a predetermined depth, only the injection pipe installation rod is extracted from the wire brush 2 to complete the installation of the injection pipe 5.

The second layer injection step is a step of forming the injection second resin layer 2.
The 2nd resin layer 7 is formed by inject | pouring the liquid mixture for foamed resin over the perimeter from the injection pipe 5 to the remaining part of the wire brush 2 in which the 1st resin layer 6 was formed.

  Since the preparation and injection method of the foamed resin mixture are the same as the contents shown in the first layer injection step, detailed description thereof is omitted.

The supplement injection step is a step of injecting the foamed resin mixture into the unfilled portion of the foamed resin mixture.
In addition, what is necessary is just to implement a supplement injection process as needed, and when an unfilled location of the liquid mixture for foaming resin is not confirmed, you may abbreviate | omit.

  In the supplement injection step, first, after confirming that the foamed resin mixture injected in the second layer injection step has gelled, an unfilled portion (supplement injection region) is checked. The unfilled location is confirmed by a deep needle, visual inspection and palpation using an injection pipe installation rod.

If an unfilled location is confirmed, the injection amount per location, the number of injections, and the like are calculated, and the blending amount of the foamed resin mixture is determined.
Moreover, a hole is made in the transparent sheet 4 corresponding to the unfilled portion.

  Next, the foamed resin mixture is injected into the unfilled portion. Since the preparation method of the liquid mixture for foamed resin is the same as the content shown by the 1st layer injection process, detailed description is abbreviate | omitted.

  In this embodiment, a notch is made at the front end of the cartridge, and the notch is pressed against the unfilled portion, and the foamed resin mixed solution put into the cartridge is pressed from the rear end of the cartridge, so that the unfilled Inject into the area.

  When the supplement injection process is completed, the cartridge is pulled out and the hole of the transparent sheet 4 is closed.

  The demolding step is a step of removing the transparent sheet 4 from the wire brush 2 and demolding as shown in FIG.

The transparent sheet 4 is removed after curing the mixed liquid for foamed resin.
After removing the transparent sheet, the edge of the spring plate 3 and the filler is cut using a keren rod or the like.

  After demolding, the unfilled portion is confirmed again, and when the unfilled portion is found, the supplementary injection step is performed again.

  As described above, according to the manufacturing method of the seal structure of the present embodiment, since the first resin layer 6 and the second resin layer 7 are continuously formed in the circumferential direction, a seam along the tunnel axis direction is formed. The water-stopping property is excellent.

  Moreover, since the wire brush 2 is filled with the foamed resin, the backfilling material does not enter the wire brush 2 and is excellent in durability. In addition, since the foamed resin hardly changes in volume and does not change even in an environment of water or air, the function of the tail seal is maintained for a long period of time.

  Moreover, since the wire brush 2 is excellent also in a softness | flexibility, it respond | corresponds also to the change of the clearance at the time of sharp curve construction etc.

  According to the manufacturing method of the seal structure of the present embodiment, since the foamed resin mixture is simultaneously injected over the entire circumference of the wire brush 2, there is no need to rotate the shield machine. It is possible to easily form the tail seal 1 without requiring a large facility. Therefore, it is excellent in workability, and the assembly process of the shield machine M can be shortened. In addition, temporary construction costs can be reduced.

  Since a three-liquid mixed type that gels at an early stage is used as the mixed resin for the foamed resin, high-quality construction can be performed regardless of the injection direction (upward, horizontal, etc.).

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to the said embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably.

  For example, in the above-described embodiment, the case where the manufacturing method of the seal structure of the present invention is employed for the tail seal of the shield machine has been described. However, the manufacturing method of the sealing structure may be employed when, for example, an entrance seal is formed. Well, the application location is not limited.

  The air gun is used for injecting the foamed resin mixture, but the apparatus used when injecting the foamed resin mixture is not limited.

  The material used as the mixed material for the foamed resin is not limited to the three liquid mixture type, and may be, for example, a two liquid mixture type.

1 Tail seal (seal structure)
2 Wire brush 3 Spring plate 4 Transparent sheet (sheet)
5 Injection pipe 6 First resin layer 7 Second resin layer M Shield machine

Claims (3)

A preparation step of covering an endless wire brush with a sheet;
A first piping step of arranging a plurality of injection pipes penetrating the sheet with respect to the circumferential direction of the wire brush;
A first layer injection step of forming a first resin layer by injecting a foamed resin mixture over the entire circumference from the injection pipe to the middle of the wire brush in the height direction;
After confirming that the first resin layer is gelled, a plurality of injection pipes are arranged in the circumferential direction of the wire brush so as to be staggered with respect to the arrangement of the injection pipes in the first piping step. A second piping step;
A second layer injection step of forming a second resin layer by injecting a foamed resin mixture into the remaining portion of the wire brush from the injection pipe disposed in the second piping step. A manufacturing method of a seal structure.   2. The seal structure according to claim 1, further comprising a supplemental injecting step of injecting the mixed liquid for foamed resin into the unfilled portion when an unfilled portion of the mixed liquid for foamed resin is confirmed. Manufacturing method.   The method for manufacturing a seal structure according to claim 1 or 2, wherein the mixed liquid for foamed resin is a three-liquid mixed type.

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