JPH0723618B2 - Manhole waterproofing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a manhole waterproofing method of the present invention.

Conventional technology and its problems As a measure for preventing water leakage from block joints and other cracks in conventional manholes, a sealing material filling method that fills the V-grooves formed along the joints and cracks with a sealing material, and a leaking point The back-filling injection method that injects the waterproofing material into the back surface of the is adopted, but with either method, the effect of preventing water leakage cannot be maintained for a long period of time, and there is a problem in the sustainability of the effect. Heat workability is required for construction,
There was a problem that the water leakage prevention effect was affected 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 applicant previously inserted a hard plastic tubular waterproof material whose outer diameter was reduced by deformation into a manhole with an adhesive layer formed on the inner surface, and then heated and pressed from the inside to restore the original shape. We have proposed a waterproof method in which the inner surface of the manhole is adhered through an adhesive layer (for example, Japanese Patent Laid-Open No. 64-43623).
(See the official gazette). According to this waterproofing method, the above conventional problems can be eliminated, but since the waterproof material restored to its original shape by heat and pressure from the inside tends to be reduced in size due to heat shrinkage and peel off from the adhesive layer, There was a very small gap between the manhole and the manhole, and there was some concern about the water leakage prevention property.

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

MEANS FOR SOLVING THE PROBLEMS The present invention is a hard plastic tubular waterproof material that is pre-molded to a size that can be substantially accommodated in a manhole to be constructed and has a large number of protrusions dispersedly projected on the entire outer surface. Using the above, after inserting the waterproof material into the manhole in a deformed state so as to have an outer diameter smaller than the inner diameter of the manhole, it is heated and pressed from the inside to restore the original shape and the waterproof material after the shape is restored. The present invention relates to a waterproofing method for a manhole, characterized in that a gap is formed between the manhole and the mandrel and a backfill material is injected and filled into the gap.

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

FIG. 1 shows a waterproof structure of a manhole constructed by applying the method of the present invention, and FIG. 2 shows a waterproof material (1) used in carrying out the method of the present invention.

As shown in FIG. 2, the waterproof material (1) comprises a container-shaped main body (11), and a large number of protrusions (12) are dispersed and projected on the outer surfaces of the body and bottom of the main body (11). Has been done.

The main body (11) is molded into a tubular shape from a thermoplastic hard plastic such as vinyl chloride resin, and the outer diameter dimension thereof is smaller than the inner diameter dimension of the manhole (a) to be constructed by the protrusion dimension of the protrusion (12). Has become. If the mouth of the main body (11) is connected to the tubular mouth (111) as shown in the figure, it is convenient to apply the mouth plug (2) (see FIGS. 6 to 7) at the time of construction.

The protrusion (12) is for forming a gap (5) (see FIG. 7) necessary for injecting the backfill material between the main body (11) and the manhole (a), and the protrusion height thereof. As long as the gap (5) with an opening width that does not hinder the injection of the backfill material is obtained, it is usually 10 to 100 mm, preferably 20 to 50 mm.
It is appropriately selected and determined from the range of degree according to the scale of the manhole (a). If the number of protrusions (12) per unit area of the protrusion (12) is too large, it may result in unfavorable results for the filling and filling properties of the backfill material, and if it is too small, it may result in unfavorable results. / m ² is suitable. Mole (1
The shape of 2) is not particularly limited, but it is preferable to have a shape that can function as an anchor such as the mushroom shape shown in the figure. The material of the protrusion (12) may be the same as or different from that of the main body (11). Usually, after molding the main body (11), an appropriate means such as adhesion or welding is applied to the outer surface of the main body (11). Is fixed in place.

The main body (11) can be covered with a non-stretchable tubular net (13) for preventing overexpansion as shown, in which case the protrusion (12) penetrates the eyes of the net (13) to the outside. It is projected toward. The net (13) preferably has a bottomed cylindrical shape as shown in the figure, but the bottom is not always necessary and may be omitted in some cases. Since the net (13) receives heat when the body (1) is heated, it must have heat resistance,
For example, it is composed of natural threads such as cotton.

Since the upper end opening (a ₁ ) of the manhole (a) is narrowed and narrowed as shown (see FIG. 5), the waterproof material (1)
In order to insert into the manhole (a), it is necessary to reduce the outer diameter dimension to the outer diameter dimension that can pass through the upper end opening (a ₁ ).

3A to 3C schematically show an example of processing for reducing the outer diameter of the main body (11) of the waterproof material (1) by omitting the protrusion (12), and the main body (11) is heated. In the softened state, the original state shown in FIG. 1A is subjected to the flattening process shown in FIG. 2B and folded in two as shown in FIG. In the flattening process shown in Fig. 2B, the bottom portion (112) of the main body (1) is folded in two upwards as schematically shown in Fig. 4.

One embodiment of the method of the present invention is shown in FIGS. 5 to 8 in the order of steps. At the start of construction, the outer diameter of the manhole (a) to be constructed is first reduced as shown in FIG. The waterproof material (1) is inserted. The mouth of the sewer pipe (b) opening in the manhole (a) is closed by a plug (c).

Next, the mouth portion (111) of the body (11) of the waterproof material (1) is preliminarily operated to open from the folded state of FIG. 5 to the unfolded state of FIG. 6 and the mouth portion (111) is plugged. (2) is applied. The mouth plug (2) is provided with a steam supply port (3) and a steam discharge port (4), and the steam pressure in the main body (1) and thus the applied pressure is controlled by appropriately selecting the supply amount and the discharge amount. Is ready to go.

Next, steam is supplied into the main body (11) of the waterproof material (1) through the supply port (3) of the spout (2) to heat and soften it, and then the steam pressure in the main body (1) is increased to a predetermined pressure. Then, the main body (11) is pressurized from the inside, and is restored from the folded state shown in FIG. 5 to the original tubular shape.

When the main body (11) is restored to its original cylindrical shape by heating and pressurizing from the inside, the protrusion (12) is located inside the manhole (a) on the outside of the main body (11) as shown in FIG. Therefore, a gap (5) having an opening width corresponding to the protrusion height of the protrusion (12) is formed between the shape restoring body (11) and the manhole (a). A large number of protrusions (1
Although 2) is present, since the protrusions (12) are individually independent and dispersed, the entire gap (5) is in communication.

After the shape restoration of the main body (11) is completed, the steam is replaced with the outside air with the inside kept pressurized, and the main body (11) is cooled and solidified. Body (11) during this cooling and solidification
Causes heat shrinkage, but since it is heat shrinkage before the backfilling step, there is no particular problem.

After cooling and solidifying the main body (11), as shown in FIG. 8, a backfill material (6), for example, cement milk, is injected and filled into the inside of the gap (5) through the upper end opening thereof. Since the entire gap (5) is in communication, the purpose of backfilling can be achieved without any problems. As the backfill material (6), in addition to cement milk, various known materials used for backfilling manholes are used.

After finishing curing the backfill material (6), sewer pipe (b)
The waterproof structure is obtained as shown in FIG. 1 by opening the portion corresponding to the mouth of the above and removing the plug (c).

In the waterproof structure thus obtained, the main body (11)
Since the gap (5) between the manhole (a) and the manhole (a) is completely erased by the backfilling material (6) injected and filled after the heat contraction of the main body (11), there is no risk of water leakage.

When the stem (12) is made into an anchor type such as a mushroom type, the main body (11) and the backfill material (6) are firmly connected and integrated via the stem (12), so that the main body (11) is Despite being made of hard plastic, a waterproof structure with high pressure resistance against groundwater can be obtained.

A coating layer (7) made of epoxy resin or the like is preferably provided and protected on the upper end exposed portion of the backfill material (6) and the exposed portion in the opening opened after the construction.

Effect According to the method of the present invention, the gap formed between the main body of the waterproof material and the manhole is filled with the backfill material after the heat shrinking of the main body, so that there is no possibility of creating a gap in the back portion of the waterproof material. It becomes possible to stably and continuously maintain the water leakage prevention effect for a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of a waterproof structure constructed by the method of the present invention, FIG. 2 is a partial vertical sectional view showing an example of a waterproof material used for implementing the method of the present invention, and FIG. FIG. 4 is a schematic explanatory view showing the deformation processing status of the waterproof body in the order of steps, FIG. 4 is an explanatory view schematically showing the status during the deformation processing of the main body bottom portion, and FIGS. It is a schematic explanatory drawing which shows a to step order. In the figure, (1) is a waterproof material, (2) is a plug, (3) is a steam supply port, (4) is the same discharge port, (5) is a gap,
(6) is a backfill material, and (7) is a resin coating layer.

Claims (1)

[Claims] 1. A tubular waterproof material made of a hard plastic, which is preliminarily molded to a size that fits within a manhole to be constructed and has a large number of protrusions dispersed and projected on the entire outer surface. After inserting into the manhole in a deformed state so that the outer diameter is smaller than the inner diameter of the manhole, heat and pressurize from the inside to restore the original shape and the protrusion between the waterproof material and the manhole after the shape is restored. A manhole waterproofing method characterized by forming a gap based on the above and filling and filling the gap with a backfill material.