JPH0637778B2 - Manhole waterproofing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole waterproofing method.

Conventional technology and its problems As a measure to prevent water leakage from block joints and other cracks in conventional manholes, a sealing material filling method that fills the V groove formed along the joints and cracks with a sealing material, and water leakage The backfill injection method, which injects a waterproof material on the back of the part, is adopted, but with either method, the water leakage prevention effect cannot be maintained for a long period of time, and there is a problem in the sustainability of the effect. At the same time, there was a problem that skill was required for the construction, and the water leakage prevention effect was influenced by the skill level. In addition, water leakage often occurs at many locations, and it is extremely troublesome to carry out waterproofing work at each location.

The present invention has been made for the purpose of eliminating such conventional problems.

Means for Solving the Problems The present invention, as a waterproof material, is preformed in a tubular shape having a size capable of closely covering the entire inner surface of a manhole to be constructed, so that the manhole has a smaller diameter than the manhole. Using a deformed hard or semi-rigid synthetic resin waterproof material, insert a deformed tubular waterproof material into this manhole into a manhole, and then plug the mouth of the waterproof material. To supply steam to the inside of the waterproof material, and heat and pressurize the waterproof material from the inside by this supplied steam to restore the initial cylindrical shape, thereby closely covering the inner surface of the manhole, and then restoring the shape. A waterproofing method for a manhole, characterized in that the waterproofing is cooled by supplying pressurized air to the inside of the waterproofing material instead of steam while keeping the inside of the waterproofing material under pressure. In charge It

EXAMPLE An example of the present invention will be described below with reference to the accompanying drawings.

In the waterproofing method of the present invention, as the waterproofing material (1), as shown in FIG. 2, the waterproofing material (1) is preliminarily molded into a molten tube shape having a size capable of closely covering the entire inner surface of the manhole (a) to be constructed. Further, a rigid or semi-rigid thermoplastic synthetic resin (for example, vinyl chloride resin) is used. At the upper end of the tubular waterproof material (1) shown in the figure, a cylindrical mouth portion (2) is formed so as to be plugged as described below. Not necessarily required.

The tubular waterproof material (1) has a size and shape corresponding to the manhole (a), and the manhole (a) remains in this shape.
Since it cannot be inserted inside, as shown in FIG.
It is flattened and then folded in half to have a smaller diameter than the manhole (a). In this case, the lower part (1
By folding a) so as to have a W shape, it is possible to reduce the dimensional change in the length direction of the waterproof material (1). The deformation processing of the waterproof material (1) is performed under a heat-softened state.

In carrying out the method of the present invention, first, as shown in FIG. 4, a reaction hardening type adhesive layer (4) is applied to the entire inner circumference of the manhole (a) by applying a coating device (3). Is formed by coating. The step of applying and forming the adhesive layer (4) may be omitted in some cases. Expansion lining of the waterproofing material (1) is performed while the adhesive layer (4) is uncured.

That is, following the coating method of the adhesive layer (4), as shown in FIG. 5, the waterproof material (1) having a small diameter by folding is inserted into the manhole (a), and then the waterproof material ( The cylindrical mouth portion (2) coupled to the upper end of 1) is appropriately applied to the upper end of the deformation member by heating means, for example, the sixth to the sixth.
As shown in FIG. 7, the shape is restored to an oval shape.

Next, a hollow plug body (5) made of heat-resistant and pressure-resistant rubber is provided on the cylindrical mouth portion (2) for restoring the shape, which is expandable and contractible, and the hollow plug body (5) is as shown in FIG. It is inflated by the pressurized air supplied through the compressor (6) and the conduit (7) to seal the tubular mouth (2).

The plug (5) has two flow paths (5
a) (5b), steam is a boiler (8)
Is supplied into the folding waterproof material (1) through the conduit (9) and the one-way channel (5a) connected to the conduit (9), and the inside is maintained at a predetermined pressure.

Therefore, the waterproof material (1) is heated and pressurized from the inside by steam to be restored from the folded state to the cylindrical shape before the deformation processing, and as shown in FIG. 1, the inner surface of the manhole (a) is adhered and covered. To be done.

After the close coating of the waterproof material (1) is obtained, pressurized air instead of steam is connected from the compressor (6) to the conduit (10) and the one-way channel (5a) while maintaining the internal pressure. ) Is supplied into the waterproof material (1), and the pressurized air cools and solidifies the waterproof material (1) while the other flow path (5)
It is discharged to the outside through b) and the exhaust pipe (11) connected thereto.

After the waterproof material (1) is cooled and solidified, the supply of the pressurized air is stopped, the plug body (5) is removed, and the tubular mouth portion (2) is cut and removed. In this state, as shown in FIG. 1, the sewer pipes (b) and (b) have their mouths closed by the waterproof material (1).
By opening the, all waterproofing work is completed.

Since the method of the present invention is a method of heating and pressurizing the tubular waterproof material (1) from the inside to line the entire inner surface of the manhole (a) for waterproofing, the construction can be performed regardless of the position or the number of water leakage points. It is efficient and efficient in a single operation, requires no skill for construction, and does not affect the waterproof performance depending on the degree of skill, and ensures stable and even waterproofness for each construction. .

Furthermore, the waterproof material (1) lined in the manhole (a) is
Since it is composed of a hard to semi-rigid synthetic resin layer,
The waterproof performance with excellent strength can be stably maintained for a long period of time, and since the inner surface of the manhole (a) is closely coated, a high waterproof effect can be obtained.

Effect According to the method of the present invention, waterproofing can be performed efficiently and without the need for skill, and a high degree of waterproofing can be stably and reliably secured for each construction, and this waterproofing can be maintained for a long period of time. It has the features that can.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view schematically showing one embodiment of the method of the present invention, FIG. 2 is a perspective view of a waterproof material used in the present invention,
FIG. 3 is a perspective view showing the folded state, FIG. 4 is a vertical cross-sectional view showing the adhesive application state on the inner surface of the manhole, and FIG. 5 is a vertical cross-sectional view showing the manhole insertion state of the folding waterproof material.
FIG. 6 is a vertical cross-sectional view showing the state of shape restoration of the mouth portion of the waterproof material, and FIG. 7 is a plan view of the same. In the figure, (1) is a tubular waterproof material, (2) is a tubular mouth,
(4) is an adhesive layer, (5) is a hollow plug, (6) is a compressor, and (8) is a boiler.

Claims (1)

[Claims] 1. A waterproof or water-resistant material, which is preliminarily formed into a tubular shape having a size capable of tightly covering the entire inner surface of a manhole to be constructed, and which is deformed to have a smaller diameter than the manhole. Using a semi-rigid synthetic resin waterproof material, insert a deformed tubular waterproof material into this small diameter into the manhole, and then steam inside the waterproof material with the mouth of the waterproof material plugged. The inner wall of the manhole is adhered and covered by heating and pressurizing the waterproof material from the inside by the steam of this internal supply to restore the original container shape. A waterproofing method for a manhole, characterized in that the waterproofing is cooled by supplying pressurized air instead of steam to the inside of the waterproofing material while maintaining the pressurized state.