JPH0452308Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a plug for sealing a grout hole provided in a concrete segment, a steel segment, or the like.

"Prior Art" Generally, when constructing various tunnels using the shield construction method, etc., prefabricated concrete segments, steel segments, etc. are conventionally used as the so-called primary lining.

This type of segment is usually formed in the shape of a circular arc, and is configured to be connected to each other in the circumferential direction (inter-piece direction) and axial direction (inter-ring direction) at the construction site. A grout hole is formed in the segment to penetrate in the thickness direction at the center of the segment.

This grout hole is used to fill the space between the segment assembled in the mine and the ground with backfilling mortar, etc. Usually, this type of grout hole is used to fill the space between the segment assembled in the mine and the ground. , it is necessary to completely seal the grout hole with a plug, etc.

FIG. 4 shows a conventional example in which such a plug for plugging a grout hole is applied to a concrete segment. That is, the plug body is configured to be screwed onto an embedded pipe 2 that is embedded in the segment body 1 and forms a grout hole passing through the segment body 1 in the thickness direction to close the grout hole. A cylindrical main body part 5 having a male thread 4 screwed into the pipe 2 and a lower surface of the pipe 2.
The flange portion 6 is in surface contact with the upper end surface 2a of the flange portion 6.

A circumferential groove 7 that goes around the circumferential direction of the main body part 6 is formed on the proximal end side of the male thread 4 of the main body part 6, and an O-ring 8 is fitted into the circumferential groove 7. It is designed to keep the pipe 2 watertight. In the illustrated example, a nut portion 9 for screwing operation is provided protruding from the upper end surface of the main body portion 6.

``Problems to be solved by the invention'' However, these conventional plugs had the following problems to be solved.

When the plug is screwed into the pipe 2, the O-ring 8 may become tangled due to friction between the outer circumferential surface of the circumferential groove 7 and the inner circumferential surface of the pipe 2, and the O-ring 8 may be damaged due to this tangle. The water stopping effect is reduced due to

In the grout hole of the concrete segment, underground water leaks along the outer peripheral surface of the pipe 2, but the conventional plug body cannot prevent such water leakage from the outside of the pipe 2.

Since the O-ring 8 is integrally attached to the circumferential groove 7 of the stopper, when repairing the O-ring 8,
The plug must be removed from the pipe 2. Therefore, when repairing, it is necessary to always check the (outburst) of groundwater and earth and sand when the plug is removed.
It is necessary to take into account the inflow, and the work of replacing the stopper becomes troublesome. In particular, if groundwater and earth and sand flow into the grout hole, repair work becomes dangerous. Note that foreign matter such as earth and sand will adhere to the inner circumferential surface of the pipe after the plug is removed, and this adhered foreign matter cannot be completely removed from the inner circumferential surface of the pipe 2, so the plug must be reattached to the pipe. When screwed together, the O-ring 8 may be damaged by the foreign matter, and in such a case, the water-stopping effect will be reduced.

The present invention was developed in consideration of the above points, and its purpose is to have a high watertight effect and to maintain the watertight effect for a long period of time. It is an object of the present invention to provide a segment grout hole plug that can be easily replaced.

"Means for Solving the Problem" Therefore, in the present invention, in a plug that is screwed into a pipe to form a grout hole penetrating the segment in the thickness direction to seal the pipe,
The stopper includes a main body having a male thread that is screwed into the female thread of the pipe, a ring-shaped water stop plate that is fitted onto the upper outer periphery of the main body and makes surface contact with the periphery of the opening of the grout hole. a nut member that is screwed onto the upper outer periphery of the main body to fix the water stop plate to the main body; , and a substrate to which this packing material is attached.

"Function" According to the stopper with the above configuration, after the main body is screwed into the pipe, a water stop plate is fitted on the upper outer periphery of the main body, and this water stop plate is fixed with a nut member.
As the nut member is tightened, the packing material of the water stop plate is pressed with a strong force in the axial direction by the substrate and comes into close contact with the periphery of the opening of the grout hole, so that the water stop function is reliably exerted.

Further, since the water stop plate can be replaced by loosening and removing the nut member, the packing material can be replaced while the grout hole remains closed with the stopper.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. In addition, in the following explanation, the fourth
Components common to the figures are given the same reference numerals to simplify their explanation.

In these figures, the reference numeral 10 indicates the plug according to the present invention, and the plug 10 includes a main body 12 having a male thread 11 that is screwed into the female thread 3 of the pipe 2, and a main body 12. A ring-shaped water stop plate 13 that is fitted onto the upper outer periphery and makes surface contact with the opening periphery 1a of the grout hole, and a nut member that is screwed onto the upper outer periphery of the main body part 12 and fixes the water stop plate 13 to the main body part 12. It is mainly composed of 14.

The main body part 12 has a large diameter part 12a in which the male thread 11 is formed, a flange part 12b to which the water stop plate 13 engages, and a small diameter part 12b in which the male thread 15 to which the nut member 14 is screwed is formed. The small diameter portion 12c has a square prism-shaped protrusion 16 on the upper surface of the small diameter portion 12c for screwing the plug 10. It is installed protrudingly.

The water stop plate 13 is formed in an annular shape with an inner diameter set to fit on the outer periphery of the small diameter portion 12c and an outer diameter set larger than the outer diameter of the pipe 2. As shown in FIGS. 1 and 2, the structure includes a packing material 20 that comes into elastic contact with the opening periphery 1a of the grout hole, and a substrate 21 to which this packing material 20 is attached.

As for the material of the packing material 20, it is possible to use a conventional water-stop packing material whose main component is synthetic rubber or synthetic resin, but in order to exhibit its water-stop function in the long term, Preferably, it is formed from a swellable composition. Examples of the water-swellable composition include swelling polyurethane resins and swelling polyvinyl alcohol resins, which are known as water-swellable compositions.
For example, by adding an unvulcanized butyl rubber compound or a vulcanized rubber compound to a swellable polyurethane resin, appropriate viscosity and elasticity can be obtained, and by adding a thermoplastic elastomer or reactive liquid rubber, alkali resistance can be achieved. Stability can be increased. In addition, as this water-swellable composition, for example, as described in Japanese Patent Publication No. 57-41298,
For the fine powder gel whose main components are vinyl acetate and methyl acrylate, butyl rubber, zinc white, stearic acid, FET carbon, paraffin softener, tetramethylural sulfide, mercabutobenzothiazole, zinc dibutyl dithiocarbide,
A water-absorbing composition prepared by adding sulfur or the like and kneading it can also be used.

In addition, in the normal case, one of the substrates 21 is
Although it is made of metal, it may be made of ceramic or high-strength plastic if necessary.

Note that the packing material 20 and the substrate 21 are
The rubber is integrated into a single piece by baking the rubber onto the metal substrate 21 or pasting it with an adhesive or the like.

On the other hand, as the nut member 14, in the illustrated example, a hexagonal nut of a size that can be screwed into the external thread 15 of the main body portion 12 is used.

Next, the operation of this embodiment configured as above will be explained.

To seal a grout hole with the plug 10 of this embodiment, as shown in FIG. 2, first, only the main body 12 of the plug 10 is screwed into the pipe 2.
Next, the water stop plate 13 is fitted to the outer periphery of the small diameter portion 12c of the main body portion 12, and the water stop plate 13 is fitted to the outer periphery of the small diameter portion 12c of the main body portion 12.
When it is fixed with a nut member 14 screwed onto the outer periphery of 2c, it will be in a sealed state as shown in FIG.

This operation is a simple operation of screwing the main body part 12 onto the pipe 2, fitting the water stop plate 13 into the small diameter part 12c, and fixing this with the nut member 14.
Furthermore, since the water stop plate 13 can be installed by screwing the main body 12 onto the pipe 2 and then fastening it with the nut member 14, the packing material 20 of the water stop plate 13 may become tangled and damaged. There is no danger and the water stopping effect can be exhibited for a long period of time.

In addition, since the water stop plate 13 can be installed after the pipe 2 is closed with the main body 12, the water stop plate 13 can be attached to the installation part (i.e., the part around the opening of the grout hole). After removing foreign matter such as soil and sand, the water stop plate 13 can be attached, so that the packing material 20 that is tightly attached to the periphery of the opening is not damaged.

Moreover, in the embodiment, the water stop plate 13 is configured to cover the entire upper end surface of the pipe 2, so in the case of a concrete segment like the illustrated example, leakage of underground water flowing along the outer peripheral surface of the pipe 2 can be completely prevented. It can be prevented.

Further, according to the plug body 10 of the embodiment, the water stop plate 13
As the nut member 14 is tightened, the packing material 20 is pressed with a strong force in the axial direction by the substrate 21, and strong compressive force and adhesion force in the axial direction are exerted. It firmly adheres to the peripheral edge 1a of the part and reliably exhibits a very high watertight effect.

In addition, in the installation operation of the stopper 10, first, the procedure of screwing the main body part 12 to the pipe 2 and then fixing the water stop plate 13 with the nut member 14 was described, but when shipping the segment from the factory, etc. In some cases, the stopper plate 13 may be attached to the main body 12 to assemble the stopper 10 in advance, and the assembled stopper 10 may be screwed onto the pipe 2 as shown in FIG. . In addition, even with such an operation, the packing material 20 of the waterstop plate 13 comes into surface contact with the peripheral edge of the grout hole, and watertightness is maintained.

By the way, when replacing the packing material 20, with the main body 12 of the stopper 10 screwed onto the pipe 2, loosen the nut member 14 and remove it from the small diameter part 12c, and remove the water stop plate 13 from the main body 12. It is only necessary to remove the water stop plate 13 and fix a new water stop plate 13 to the main body 12 via the nut member 14.

This replacement operation can be performed with the grout hole closed by the main body 12, so
It has the advantage that there is no need to consider the spouting of water such as groundwater from the grout hole, and it can be replaced safely and easily.

Although the illustrated example shows an example in which the plug according to the present invention is applied to a concrete segment, it goes without saying that it can also be applied to the case of closing a grout hole in a steel segment.

"Effects of the Invention" As explained above, the plug according to the present invention has the following excellent effects.

(a) The water stop plate can be installed by screwing the main body into the pipe and then securing it with a nut member, so there is no risk of the packing material of the water stop plate becoming tangled and damaged. The water stopping effect can be exhibited for a long period of time. Furthermore, by tightening the nut member, the packing material is strongly pressed against the periphery of the opening of the grout hole to exhibit a water-stopping function, so there is an advantage that the water-tight effect is extremely high.

(b) Since the water stop plate covers the periphery of the opening of the grout hole, when applied to the grout hole of a concrete segment, it is possible to completely prevent groundwater from leaking along the outer circumferential surface of the pipe.

(c) Since the water stop plate can be replaced with the grout hole closed by the main body of the stopper, there is no need to consider the possibility of water such as groundwater gushing out from the grout hole, making it safer and more convenient. Can be easily replaced.

(d) In addition, when installing the water stop plate, it is possible to install the water stop plate after the pipe is closed with the main body as described above. It is possible to keep the opening (periphery of the opening) clean and prevent damage to the packing material due to foreign matter such as earth and sand.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, with Figure 1 being a cross-sectional view showing the grout hole and plug, and Figure 2 showing the plug screwed into the grout hole. A half-sectional view, FIG. 3 is a top view of the stopper,
FIG. 4 is a half-sectional view showing an example of the structure of a conventional plug. 1... Segment body (in the case of concrete),
2...pipe, 10...stopper, 11...male thread,
12... Cylindrical part, 12a... Large diameter part, 12b...
Flange part, 12c...Small diameter part, 13...Water stop plate, 14...Nut member, 15...Male thread, 20
...Packing material, 21...Substrate.

Claims (1)

[Scope of utility model registration request] A stopper screwed into a pipe forming a grout hole penetrating the segment in the thickness direction to seal the pipe, the stopper having a main body portion having a male thread that is screwed into the female thread of the pipe; ,
A ring-shaped water stop plate that is fitted onto the upper outer periphery of the main body and makes surface contact with the opening periphery of the grout hole, and a nut member that is screwed onto the upper outer periphery of the main body and fixes the water stop plate to the main body. A plug for a segment grout hole, characterized in that the water stop plate is composed of a packing material that comes into elastic contact with the periphery of the opening of the grout hole, and a substrate to which the packing material is attached.