JPH03134390A - Water stop method for pipe channel imbedded in concrete and water expansion type water stop material for pipe channel - Google Patents

Abstract

PURPOSE:To obtain sufficient water stop effect when a pipe is opened into a manhole by mounting a ring-shaped water expansion type water stop material to the outside diameter of a channel of a pipe to be imbedded in concrete, connecting them by use of adhesive, and placing concrete around the water stop material. CONSTITUTION:An electrical pipe 2 is fixed to an opening of a concrete wall 4 of a manhole 3, and a clearance between the opening and the electrical pipe 2 is filled by concrete 7. When it is imbedded, a ring-shaped water expansion type water stop material 6 is fixed around the end part of the electrical pipe 2 in advance by using adhesive 5, and clearance is filled by concrete 7. The water expansion type water stop material 6 has the unfolded fan shape (inverse trapezoidal form) in which width of outside circumferential section is larger than that of adhesion face (inside circumferential section) with the electrical pipe 2. Consequently, sufficient water stop effect is obtained, water is not collected in the manhole, and good workability is also obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a water-swelling water-stopping method for pipes buried in concrete and a water-swelling water-stopping material for pipes.

(Prior Art) Buried conduits for electrical, communication, etc. cables are connected to manholes by pouring concrete.

However, the boundary between the poured concrete and the pipeline often does not adhere tightly due to shrinkage of the concrete or vibrations from the road, and moisture can enter from the surrounding soil through this area.
Water puddles may form inside the manhole, which may impede work inside the manhole. To solve this problem, we wrapped a strip of water-expandable water-stopping material around the buried pipe.
There is an example of a method of preventing moisture from entering the manhole by placing concrete and engraving this water stop material when water enters, but this method also has a sufficient water stop effect. The current situation is that this is not possible.

(Problems to be Solved by the Invention) As described above, with the conventional technology, when opening or connecting a buried pipe into a manhole, it is not possible to obtain a sufficient water-stopping effect, and water accumulates inside the manhole. , it was causing trouble to work inside the manhole. Further, since water permeates into the manhole, the inside of the manhole cannot be maintained in a dry state, and there are problems such as impeding insulation when installing electrical parts.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a water-swelling water-stopping material for a concrete buried pipe and a water-swellable water-stopping material for a pipe that can exhibit a sufficient water-stopping effect when opening or connecting the buried pipe into a manhole. purpose.

[Structure of the Invention] (Means for Solving the Problems) The method for stopping water in concrete-buried pipes of the present invention which solves the above-mentioned problems is such that water W! , a ring-shaped water-swellable water-stopping material made of a flexible material and having a cross-sectional shape that widens at the end with an outer width larger than an inner diameter width is wrapped around the pipe, and the outer diameter of the pipe and the above-mentioned The method is characterized in that water is cut off while the buried pipe is opened or connected to the manhole by bonding the inner diameter of the water cutoff material with an adhesive and placing mortar or concrete around the water cutoff material. shall be.

In addition, the water-expandable water-stop material for pipes of the present invention includes a ring-shaped water-expandable water-stop forest surrounding the outer diameter of a pipe to be buried in concrete, and The water used when performing water stop treatment with the buried pipe opened or connected to a manhole by bonding the inner diameter of the material with an adhesive and placing mortar or concrete around the water stop material. The inflatable water stop forest is characterized in that the cross-sectional shape of the water cutoff material is widened toward the end by making the outer diameter width larger than the inner diameter width.

Further, in the above-mentioned water-expandable water-stop material for pipes, the cross-sectional shape of the water-stop material is characterized in that the outer diameter portion is formed into an arcuate concave portion or has one or more concave grooves.

Furthermore, the above-mentioned water-swellable water-swelling material for pipes is characterized in that the water-swelling material is formed in layers with compounding agents whose water-swelling property increases sequentially from the inner diameter portion to the outer diameter portion.

(Function) In the water-stopping method for concrete-buried pipes and the water-expandable water-stopping material for buried pipes of the present invention, the cross-sectional shape of the ring-shaped waterstopping material is made such that the outer diameter width is larger than the inner diameter width. Since it has a shape that widens at the end, its water-stopping properties are significantly improved compared to a simple rectangular shape or a trapezoid with a tapered end. Also,
Since the water stop material is bonded to the outside diameter of the pipe, the water stop between the two is complete.

The reason for this is that mortar or concrete (hereinafter referred to as concrete) is placed after the underground pipes are covered with a water-inflatable water stop forest, but at this time, the water stop material is applied before the concrete hardens. It absorbs moisture in the concrete and expands to a certain extent, and then after the concrete hardens, the absorbed moisture evaporates and it contracts by that amount, creating a rare gap between it and the concrete.

(2) If the water-stopping material is formed into a simple rectangular or trapezoidal shape, the gap cannot be filled quickly enough even though the water-stopping material is engraved by the penetration of water. However, in the water stop material of the present invention, the cross section is formed in a shape that widens toward the end.
This is believed to be because the leakage distance is lengthened by the amount of spread, and the spread portion is quickly engraved by the penetrating water, quickly filling the gap.

■ Also, the water stop material of the present invention has its bottom part glued to the pipe, and the width of the pipe bonded part is smaller than the width of the outer diameter part, so as shown in FIGS. 8 and 9. When the concrete assimilates, a surface pressure P is generated between the concrete 7 and the base of the inner diameter of the water stop material 6 due to the contraction of the concrete that rises away from the outer diameter side of the pipe. It is considered that the infiltration of water can be further suppressed in the area where this surface pressure P occurs.

In addition, in the water stop material of the present invention, when an arcuate recess or one or more concave grooves are formed on the outer diameter of the cross-sectional shape, the leakage distance can be sufficiently long and water engraving can be performed within the penetration time. This allows the gap to be completely filled. In particular, when forming four arcuate parts, the thickness of the portion that widens toward the end becomes thinner, so the ratio of engraving speed to the gap becomes large, and the gap can be quickly filled.

Furthermore, in the present invention, when layers are formed with compounding agents whose water swellability increases sequentially from the inner diameter part to the outer diameter part, the adhesive strength is increased by optimizing the water swellability of each layer.
In addition, the effects of (1) and (2) can be appropriately enhanced to further enhance the water-stopping performance.

(Example) The present invention will be explained in detail below.

Normally, when opening an electric pipe into a manhole, as shown in Figure 1, the electric pipe 2 is fixed to the opening in the concrete wall 4 of the manhole 3, and the gap between the opening and the pipe 2 is filled with concrete or mortar 7. is taken. At this time,
A ring-shaped water-expandable water stop material 6 is attached to the tip of the tube 2 with adhesive 5.
is fixed in advance, and the void is filled with concrete or mortar 7.

FIG. 2 shows an enlarged cross-sectional view of an example of the water-expandable water stop material 6.

The illustrated water stop material 6A has a shape that widens towards the end (inverted trapezoid shape) so that the width of the outer diameter part is larger than the adhesive surface (inner diameter part) 8 with the pipe 2. Opening angle θ of side surface 10 with respect to adhesive surface 8
is more than 90' to 135°, more preferably 95 to 135°
It is assumed to be 120°.

Figure 3 shows the change in expansion pressure during the initial stage of concrete (mortar) pouring. The horizontal axis shows time, and the vertical axis shows inflation pressure.

This figure was obtained by using an experimental apparatus corresponding to FIG. 1 and embedding a small pressure sensor at the 6 position of the water stopper. "Mold removal" means manhole 3
This indicates that the (gold) mold corresponding to the formwork placed on the inner surface of the mold was removed 24 hours after pouring.

As shown in the figure, the expansion pressure reached the maximum value at 72 hours, 56 hours, and 42 hours for the samples (waterstop materials) with each formulation 1, 2, and 3, and the expansion pressure decreased immediately after that. There is.

In other words, from this figure, each water stop material starts engraving even when the concrete hardens, and the concrete hardens at the time when the expansion pressure is at its maximum, and then water stops as the concrete dries. It can be seen that the material also contracts and the expansion pressure decreases. Also, as is well known, concrete is
It solidifies almost completely in 48 hours, and gradually hardens over the next several decades, but as the concrete begins to harden, the pressure increases, so the part where the water stop material 6 is engraved within 24 to 48 hours. It can be seen that the major problem is how to completely and quickly fill this gap.

Here, in the water stop material 6△ shown in Fig. 2, the width of the outer peripheral surface 9 is larger than the width of the adhesive surface 8, and the width is widened at the end, so for the reasons of It can exhibit excellent water-stopping performance.

The water-stopping material 6B shown in FIG. 4 is different from the water-stopping material shown in FIG. 2 in that the outer circumferential portion thereof has an arcuate concave shape.

The effect of the water stop material in this example is almost the same as that shown in FIG. The larger the size, the higher the water-stopping material performance. The side surface 13 may have a straight shape or may have an appropriate concave or convex shape.

The water stop material 6C shown in FIG. 5 is different from the water stop material 6A shown in FIG. 2 in that one groove 14 is provided on the outer peripheral surface.

In this example, the concave groove 14 allows the leakage distance to be longer, and the pressure in the lateral swelling portion is also reduced, thereby minimizing the occurrence of gaps. The concave groove 14 has a so-called dovetail groove shape, so that the leakage distance can be made longer and the pressure drop can be made greater.

A water stop material 6D not shown in FIG. 6 is an example in which the number of grooves is 2 (plurality > 14A, 14B) compared to the water stop material 6C shown in FIG.

In this example, the water stop performance can be adjusted as appropriate by adjusting the number of grooves 14A and 14B.

The water stop material 6 shown in FIG. 7 has a multilayer structure similar to the water stop material 6A shown in FIG. 2.

That is, the water stop material of this example contains non-engravable, low engraving, and high expansibility compounding agents E+ and E2 from the adhesive surface to the outer peripheral surface.
, E3 has a multilayer structure.

In this example, the layer facing the adhesive surface is made non-engravable and an intermediate layer is provided, so that the adhesion performance is good and the effects of ■ and ■ described in the function section can be fully demonstrated. Yo,
The formulation of each layer can be adapted.

In the above-mentioned embodiment, concrete or mortar 7 is embedded in the gap using the explanatory diagram of FIG. 1, and the pipe 2 is opened into a manhole, but the present invention is not limited to this. The present invention can be implemented in any appropriate manner by making appropriate design changes.

[Effects of the Invention] As described above, since the present invention is a water-expandable water-stopping material for pipes as described in the claims, it provides sufficient water-stopping when opening or connecting a buried pipe into a manhole. This has the effect of not causing water puddles inside the manhole, improving workability inside the manhole, and keeping the inside of the manhole dry at all times.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing an overview of the water stoppage method, Figure 2 is an explanatory cross-sectional diagram showing an example of a water-swellable waterstop forest, and Figure 3 is an explanatory diagram showing changes in swelling part pressure at the initial stage of concrete placement. , Figure 4, Figure 5
6 and 7 are cross-sectional views showing other embodiments of the water-stopping material, and FIGS. 8 and 9 are illustrations of the water-stopping action. 2... Pipe 3... Manhole 4-... Concrete 5... Welding agent 6 (6A, 6
B, 6C, 6D, 6E)...Water stop material 7...Mortar

Claims (5)

[Claims] (1) A ring-shaped water-expandable stopper is used for the outer diameter of the pipe to be buried in concrete, using a water-expandable material and making the cross-sectional shape wider at the end with the outer diameter wider than the inner diameter. The buried pipe is connected to the manhole by enclosing a water material, bonding the outer diameter of the pipe with the inner diameter of the water stop material using an adhesive, and placing mortar or concrete around the water stop material. A method for stopping water in concrete-buried pipes, which is characterized by stopping water in a state where the pipes are opened or connected inside. (2) A ring-shaped water-expandable water stop material is wrapped around the outer diameter of the pipe to be buried in concrete, and the outer diameter of the pipe and the inner diameter of the water stop material are bonded with an adhesive. A water-expandable water-stopping material used for water-stopping the buried pipe in a state where it is opened or connected to a manhole by placing mortar or concrete around the water-stopping material, the water-stopping material 1. A water-expandable water stop material for pipes, characterized in that the cross-sectional shape of the material is widened toward the end by making the outer diameter width larger than the inner diameter width. (3) The water-expandable water-stop material for pipes according to claim 2, wherein the water-swellable water-stop material for pipes has a cross-sectional shape in which an outer diameter portion is formed into a concave portion having an arcuate shape. Water stop material. (4) In the water-expandable water-stop material for pipes according to claim 2, the cross-sectional shape of the water-stop material has one or more concave grooves in the outer diameter part. waterproof material. (5) In the water-swellable water-stopping material for pipes according to claim 2, the water-stopping material is formed in layers with compounding agents whose water-swellability increases sequentially from the inner diameter part to the outer diameter part. Features: Water-expandable water-stopping material for pipes.