JP2009174187A - Water cut-off ring and method of cutting off water for concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water cut-off ring hard to fall depending on a fall impact on a concrete, maintaining the fitted state thereof to the outer periphery of a penetration body when swelled with water, having improved water cut-off effect, and easily installable. <P>SOLUTION: This water cut-off ring comprises a water expandable rubber 6 formed of a water expandable material which is formed in a thick string shape and a core 7 buried integrally at the cross sectional center along the longitudinal direction of the water expandable rubber 6, which has proper springing property and a restorability, and which is formed in a ring shape or a spiral shape in the natural state. The ring can be generally formed in a ring or spiral thick string. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a water-stop ring made of a water-expandable rubber material and a water-stop construction method for a concrete structure using the same, and in particular, improves the effect of preventing the drop-off from a water-stop target when placing concrete, and the mounting efficiency. TECHNICAL FIELD The present invention relates to a water stop ring and a water stop method for improving the water resistance.

For example, between the rod-shaped separator for holding the formwork and the concrete placed in the formwork, a gap is likely to occur, and water penetrates from one side of the concrete to the other side with this gap as a waterway, It causes water leakage.
Thus, conventionally, a water stop ring made of a perforated disk-like water-expandable rubber material is inserted into the middle portion of the bar-shaped separator to block the water channel.

However, the conventional water stop method using a perforated disk-shaped water stop ring has a problem that the bar separator must be put through the water stop ring before the bar separator is installed in the concrete formwork.
If it is necessary to install a water stop ring after installing the separator or sleeve tube in the concrete formwork, remove the separator or sleeve tube from the concrete formwork again and insert a ring-shaped water stop ring from the end. There was no choice but to install.
Then, in order to eliminate such a malfunction, the water stop structure shown in the following patent document 1 is proposed.

This water stop structure forms a slit between the outer periphery of the water stop ring made of a water-swellable rubber material that forms a flat disk shape and the substantially central inner opening, and expands and contracts this slit to make the water stop material perpendicular to the separator. Further, an expansion restraining material made of a metal C-shaped ring is fitted into the outer periphery of the water stop material.
JP-A-5-302432

  However, in this water stop structure, it is necessary to attach both the water stop material and the expansion restraint material to the separator with different positions in the outer peripheral direction of the slit portion. Since the water-stop ring is just straddled on the outer periphery of the separator, the concrete itself and the aggregate contained in the concrete are dropped when the concrete is placed in the formwork. The water stop ring was struck by the impact and easily removed from the separator, and the function as a water stop material was not achieved. Further, even if the expansion restraining material is fitted on the outer periphery of the water stop ring, the restraint material itself is easily detached from the water stop ring due to a drop impact, and this also causes the water stop ring to drop off.

  The present invention solves the above-described problems, and the object of the present invention is to prevent the concrete from falling off due to a drop impact of the concrete once attached to the outer periphery of the penetrating body, and to penetrate during water expansion. The present invention provides a water-stop ring that is easy to mount and maintains a close contact state with the outer periphery of the body and can improve the water-stop effect, and a water-stop method for a concrete structure using the ring.

  In order to achieve the above-mentioned object, the water stop ring 5 of the present invention includes a water-swellable rubber 6 made of a water-swellable material formed in a string shape, and a cross section thereof along the longitudinal direction of the water-swellable rubber 6. It is embedded integrally in the center, has a moderate spring property and deformation followability or restoration property, and comprises a core material 7 formed in a ring shape or a spiral shape in a natural state, and has a ring shape or a spiral shape as a whole. It is characterized by a string shape.

  The core material 7 is characterized by being made of a wire having a restoring property previously formed in a spiral shape in a natural state.

The present invention closes a water channel formed between the concrete structure and the through-holes 1 and 10 and disposed on the outer periphery of the through-holes 1 and 10 disposed through the inside and outside of the concrete structure. In the water stop ring 5, a water-swellable rubber 6 made of a water-swellable material formed in a string shape and a water-swellable rubber 6 are integrally embedded in the center of the cross section along the longitudinal direction of the water-swellable rubber 6 and have an appropriate spring property. And a core 7 formed in a ring shape or a spiral shape in a natural state, and has a ring shape or a spiral string shape as a whole. The water-stop ring 5 is characterized by having a structure that is spirally held by being wound around.
The water stop ring 5 may be wound from 1 to 3 turns, for example, 1 turn and a half. As shown to Fig.3 (a), sufficient expansion | swelling water-stopping effect is acquired by making material cost into the minimum by making the outer periphery of a penetration body wind 1 round and a half.

  The penetration body is characterized in that it is a burying type rod-shaped separator 2 disposed between the concrete casting molds 1 and 1.

  In addition, the penetrating body is a wiring / pipe sleeve 10 which is disposed so as to penetrate between the concrete casting molds 1 and 1 and is embedded through the concrete structure.

  It is desirable that the winding start end and the winding end end of the water stop ring 5 are twisted and held on the outer periphery of the penetrating body in order to improve the adhesion and drop-off preventing function.

  In the water stop construction method for a concrete structure according to the present invention, the above-mentioned water stop ring 5 is used, the through bodies 2 and 10 are disposed between the concrete casting molds 1 and 1, and placed at appropriate positions on the outer periphery of the through body. The water stop ring is deformed along the outer peripheral shape of the penetrating body, and is wound from one to three rounds, for example, one and a half rounds, and concrete C is placed between the subsequent molds. .

  In the present invention, the water stop ring 5 is held in a wound state on the outer periphery of the penetrating body due to the spring property of the core material 7 integrated with the water-expandable rubber 6, so that the impact when the concrete C is placed is impacted. Depending on the situation, it will not fall out. Moreover, since the water-expandable rubber 6 expands while being in close contact with the outer periphery of the penetrating body due to the restraining force due to the spring elasticity of the core member 7, the water stop effect is improved.

  Further, according to the present invention, water leakage of the concrete structure C1 caused by the separator and the sleeve can be prevented, and a water stop ring can be attached afterward with the separator and the sleeve installed between the molds.

If the winding inner diameter of the water stop ring is slightly reduced and expanded and fitted, it can be easily mounted even on a somewhat large outer shape, and the adhesion is also good. By preparing multiple types of water stop rings with different inner diameters, they can be attached to separators and sleeve tubes of various sizes.
Since the water-stop ring of the present invention, which has a habit in the spiral direction at the time of mounting, can be mounted with the habit reversed to improve adhesion, it can be adhered over a long period of time.

  Furthermore, in the present invention, the water-stop ring 5 can be securely held on the outer periphery of the penetrating body, and a spiral water-stop ring is suitably used even when the penetrating body has a large diameter such as the sleeve 10. It can be fixed securely by cutting it into lengths.

  In the water stop method of the present invention, the water stop ring 5 can be wound around the penetrating body by using a manual operation or a simple instrument without requiring a special tool or jig, and the operation is simple. A reliable water stop effect can be obtained.

  1 and 2 show a first embodiment when the water stop ring of the present invention is applied to water stop of a separator. In FIG. 1 (a), a plurality of round bar-shaped separators 2 having male screw portions formed on the entire circumference are disposed between a pair of molds 1 for placing concrete, and both ends of each separator 2 are connected to the mold 1 The inner side of the mold 1 is positioned and abutted by a wooden corn 3 (or nut), and a nut 4 is screwed into the protruding end of the outer side of the mold 1 so that the gap between the two molds 1 is reached. It is held in a predetermined gap.

  On the outer periphery of the separator 2 at an appropriate position in the longitudinal direction (substantially the center position in the figure), a water stop ring 5 according to the present invention is wound, for example, one and a half times. As shown in an enlarged view in FIG. 2, the water stop ring 5 is formed in a thick string shape, and has a moderate spring property and deformation followability such as a thin wire along the longitudinal direction at the center of the cross section. It is made of a water-expandable rubber 6 having a predetermined length and diameter in which a core material 7 having a restoring property is embedded integrally.

  The water stop ring 5 may be formed in advance in a short spiral shape of one or more turns. In addition, a relatively long spiral string is used, and when the separator 2 is mounted, the water-expandable rubber 6 is separated into a length that can be wound about 1 to 3 times depending on the outer diameter of the separator 2 with a nipper or the like. May be.

  During the mounting operation, the water-stop ring 5 is wound around the separator 2 in this winding state by being wound around the outer periphery of the separator 2 against the spring property of the core material 7 by the manual operation of the operator. It is firmly wound around the outer periphery. 2 shows a state in which the core member 7 protrudes from the cut end surface of the water-expandable rubber 6 for the sake of explanation. In actuality, however, the end surface of the core member 7 is water-expanded during cutting. It cuts off on the same surface as the cut end surface of the synthetic rubber 6.

  As shown in FIG. 1A, concrete C is placed between the molds 1 after the water stop ring 5 is mounted. At this time, the impact due to the drop or rebound of the concrete C is continuously applied to the separator 2 and the water stop ring 5 during the placement, and is particularly hit by the coarse aggregate in the concrete material. Since the tightening force of the core member 7 is also acting on the water stop ring 5, the water stop ring 5 is securely held on the outer periphery of the separator 2 without causing a dropout as in the prior art. Become.

  After passing the appropriate curing time after placing the concrete C, as shown in FIG. 1 (b), the nut 4 is removed, the mold 1 is removed, the wooden container 3 is pulled out, and a separator is used as necessary. If the outer protruding end of No. 2 is cut, and the seal material 8 is filled in the wood-contained trace (in the case of a nut, it is left in the concrete as it is), and the concrete structure frame C1 is completed with the separator 2 being buried. To do.

  The concrete after curing shrinks and, as in this embodiment, a male screw portion is formed on the entire circumference of the separator 2, and even if there is a biting effect due to the unevenness, a slight gap is generated at the boundary surface. . If the left side of the structure housing C1 is the outside of the building toward FIG. 1 (b), the rain water soaked in the outer surface or the water inside the structure housing C1 is a water tank when the structure housing C1 is a water tank. It penetrates toward the inside or outside of the building along the direction of the arrow, with the boundary surface between the concrete portion and the separator 2 as a water channel. However, as a result of contact with the water stop ring 5 provided in the middle, the water-expandable rubber 6 absorbs leachate, and as a result, swells (volume expansion increase rate is about 100%), and the water path is blocked.

  FIG. 3 shows a second embodiment. In the figure, a sleeve 10 is piped through the structure C1 through the left-right direction of the structure C1. The sleeve 10 is used to secure wiring and piping space such as electric wires and telephone lines, and the material thereof includes steel pipes, PVC pipes, etc., and penetrates the formwork in advance as in the first embodiment. The water stop ring having the same configuration as that of the first embodiment is disposed at an appropriate position outer periphery (the center in the left-right direction in the figure). 5 is wound.

  However, since the diameter of the sleeve 10 is large, simply tightening the water stop ring 5 causes a weak tightening force. For this reason, in this embodiment, as shown in FIG. 3A, the winding is carried out around the outer periphery of the sleeve 10 so that the winding start and the winding end 5a overlap in the axial direction. You may make it keep in a winding state, and as shown in FIG.3 (b), you may make it keep in a winding state by twisting below and forming the knot 5b. In this operation, it may be directly twisted by hand, or a simple tool such as pliers may be used.

  Also in the present embodiment, when the water that has permeated in the direction of the arrow contacts the water stop ring 5, the water stop ring 5 absorbs and swells to block the water channel. In particular, in the case of the sleeve 10, a material that does not have irregularities such as a male screw portion on the outer periphery like the separator 2 of the first embodiment and is made of a material having a different coefficient of thermal expansion from concrete such as a PVC pipe is embedded. In such a case, a water channel is easily formed due to the difference in thermal shrinkage, which is more preferable.

(A), (b) is sectional drawing for description which shows the state before and behind construction by 1st Embodiment of this invention. It is a partial expansion perspective view which expands and shows the inside of circle A of Drawing 1 (a). (A), (b) is sectional drawing for description which shows 2nd Embodiment of this invention.

Explanation of symbols

1 Formwork 2 Separator (penetrating body)
3 Woodcon (Bracon)
4 Nut 5 Water-stop ring 5b Knot 6 Water-expandable rubber 7 Core material 10 Sleeve (penetrating body)
C Concrete C1 Concrete structure frame

Claims (7)

A water-swellable rubber made of a water-swellable material shaped like a string and embedded in the center of the cross-section along the longitudinal direction of the water-swellable rubber. A water-stop ring comprising a core material formed in a ring shape or a spiral shape in a state, and having a ring shape or a spiral string shape as a whole. The water stop ring according to claim 1, wherein the core member is made of a wire having a restoring property that is formed in a spiral shape in advance. In the water stop ring that is arranged on the outer periphery of the penetrating body arranged through the inside and outside of the concrete structure and closes the water channel formed between the concrete structure and the outer periphery of the penetrating body,
A water-swellable rubber made of a water-swellable material shaped like a string and embedded in the center of the cross-section along the longitudinal direction of the water-swellable rubber. In the state, it is composed of a core material formed in a ring shape or a spiral shape, and becomes a ring shape or a spiral string shape as a whole, and is formed in a spiral shape by being wound around the outer periphery of the penetrating body. A water-stop ring characterized by having a held structure. The water stop ring according to claim 3, wherein the penetrating body is a burying type rod-shaped separator disposed between the concrete casting molds. 4. The waterstop according to claim 3, wherein the penetrating body is a wiring / piping sleeve that is arranged to penetrate between the concrete casting molds and is buried through the concrete structure. ring. The water stop ring according to any one of claims 3 to 5, wherein a winding start end and a winding end end of the water stop ring are twisted and held on the outer periphery of the penetrating body. A water blocking ring according to any one of claims 1 to 6, wherein a penetrating body is disposed between concrete casting molds, and the water blocking ring is disposed at an appropriate position on the outer periphery of the penetrating body. A waterproofing method for a concrete structure, wherein the concrete structure is wound while being deformed along the outer peripheral shape of the steel, and then concrete is placed between the molds.

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