JPH09310420A - Water stopping construction method for concrete placing joint part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make easy the bending process of a hose at a corner part by laying a hose for injecting water stop material hardly bending in one direction on the placing joint surface between preceding-placing concrete and succeeding- placing concrete, and arranging connectors on the end parts of the hose. SOLUTION: After placing and curing preceding-placing concrete, a hose main body 1 is laid on the position for succeeding-placing concrete, and connector main bodies 5 are arranged on the end parts of the hose main body 1. After placing the succeeding-placing concrete, foaming water stop material is injected from the water stop material injection port of the connector main body 5, and the water stop material is injected in the injection passages 2 of the hose main body 1 through the injection passage 2' of a connector main body 5. Injection pressure of the water stop material is increased, and a part of the water stop material is leaked through slits on the side of the hose main body 1 so as to densely fill the placing joint part. The hose main bodies 5 are connected together through the connector main body 5 on the corner and the like of the placing joint, and the bending process at the corner part is made easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enhances the adhesion between a pour joint of a precast concrete and a post-concrete concrete, and injects a water-stopping material also into the horizontal or vertical corners of the pour joint. The present invention relates to a water stop construction method for a concrete splicing part, which enables a hoses for use to be stably arranged.

[0002]

2. Description of the Related Art For example, it is not possible to place concrete horizontally to form a floor surface and then to vertically place concrete on the floor surface to form a wall surface. As is routine in the technical field, the concrete on the floor becomes the first-cast concrete and the concrete on the wall becomes the second-cast concrete in the order before and after the concrete is cast. The same is true for concrete pouring over structures such as adjacent walls and columns.

Since such a precast concrete and a postcast concrete have a time difference in pouring, or due to the entrainment air of concrete, a defective construction, or a jumper caused by an error at the splicing joint, they are adhered to each other. (Watertightness) may be difficult to achieve, and this may cause seepage of spring water especially in structures such as basements. Therefore, the joint ends of both concrete layers shall be waterproofed. There is a need.

As a means therefor, a sponge-like absorbent body is provided on the installation surface of a relatively flat hose body in which a plurality of injection passages are formed in parallel as shown in Japanese Utility Model Registration No. 3011894. There is known a water-stopping hose which is arranged so as to be parallel to the main body and has a minimum discharge hole formed in the hose main body. Then, a water blocking material made of non-foaming synthetic resin is injected into the injection passage of the hose body at high pressure to inflate the hose body, thereby filling the voids of the precast concrete and the postcast concrete. I am trying to do so.

[0005]

However, since the sponge-like absorbent body is arranged on the lower surface of the hose body, the water blocking material discharged from the minimum discharge hole of the hose body is absorbed by the absorbent body, and Since a water blocking layer having an appropriate thickness is formed to be maintained by the absorber and does not flow any more, it does not flow indefinitely, so to speak, in the one described in the above publication. Because the injection material used is non-foaming as described above,
In order to swell the hose body, only the injection pressure is expected, so that it may be difficult to achieve the adhesion of the splicing portion.

Further, since the hose body is made of vinyl chloride in a flat shape, and the hose body has, for example, three injection passages, it is impossible to bend in the width direction. When you try to bend it, the bent part will rise from the installation surface, and if you fix it firmly to the precast concrete surface using another jig to prevent it from rising, it will become a straight line to the main body As a result, deformation such as twisting or lifting occurs in a portion, and as a result, bending processing at the corner portion is almost impossible.

Furthermore, since the synthetic resin that does not foam is used as the waterproof material used for this purpose, the expansion pressure of the hose body does not become higher than the injection pressure even if it is injected into the hose body. And, even if this water blocking material leaks to the outside from the hose body via the minimum discharge hole,
The same is true of the concrete splicing part, and therefore it was difficult to achieve close contact (watertightness).

[0008]

Therefore, in order to solve the above-mentioned problems, the method of waterproofing a concrete splicing portion according to the present invention, in order to solve the above-mentioned problems, bends in one direction on the splicing surface of the precast concrete and the postcast concrete. Laying a water-stopping material injection hose that is difficult to do, and filling the water-stopping material injection hose with the injection material to stop the water on the above-mentioned joint surface, in the water-stopping method for the concrete joint surface. Water injection material to continuously increase the internal pressure in the water-stopping material injection hose, and to leak a part of the water-stopping material from the side surface of the water-stopping material injection hose to the splice surface. By enabling the solid filling of the portion, and by disposing a connector at the end of the water blocking material injecting hose,
It is designed to push or stop the water blocking material and to connect the hose for injecting the water blocking material.

[0009]

In other words, according to the present invention, in addition to the injection pressure of the injection material, the hose for injecting the waterproofing material is inflated by utilizing the foamability of the injection material itself, and at the same time, the injection material leaks around the hose. For close contact between splicing hoses,
In addition, at the corners of the splicing portion, the hose can be connected by the connecting tool so that the hose can be laid in a stable state.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a water stop construction method for a concrete splicing part according to the present invention will be described with reference to the drawings. 1 is a relatively flat shape in which three injection paths 2 are formed in parallel. It is a hose body, and the injection passage 2 of the hose body 1 is open at both ends of the hose body 1 in a normal state, and a slit 3 (minimum size) having a length of about 2 to 3 mm is provided all around the hose body 1. A plurality of discharge holes) are formed. Although the hose body 1 is made of vinyl chloride, it may be replaced with a material similar to this.

Reference numeral 4 denotes a sponge-like absorber disposed on the installation surface of the hose body 1 (the lower surface in FIG. 3) by adhesion or the like. The sponge-like absorber 4 is formed into continuous cells. In addition, the hose body 1 is formed to have substantially the same width and an appropriate thickness.

On the other hand, the connector main body 5 is also formed in a rectangular shape from vinyl chloride or the like, and the injection path 2'is formed. The connector main body 5 may be made of a material that is slightly harder than the hose main body 1 in order to improve the handleability thereof, and therefore ABS, nylon, polypropylene or the like may be used.

Reference numeral 6 is a joint portion which can be inserted into the injection passage 2 of the hose body 1. Therefore, when the injection passage 2 of the hose body 1 is three, the joint portion 6 is also three,
The corresponding male and female relationships are formed. The injection passage 2'formed in the connector main body 5 is formed in one piece common to the inside of the connector main body 5, that is, formed in a hollow shape, and in the joint portion 6, the joint portion 6 is formed in a nozzle shape. It is configured by

The length of the connector body 5 is also 2
A plurality of very small discharge holes each having a slit 3 ′ shape of about 3 mm are formed, and the slit 3 ′ may be formed not only on at least the installation surface side but also on another surface. In the case where the connector main body 5 is made of a hard material as described above, and when the minimum discharge hole is formed into the slit 3 ′ shape, the water blocking material is slit 3 ′ regardless of the internal pressure. Since there is a possibility that it may be difficult to leak from the above, the minimum discharge hole may be formed in a circular shape.

Further, a sponge-like absorber 4'is also provided on the installation surface of the connector main body 5, and this sponge-like absorber 4'is also formed into open cells and adhered by using an adhesive or the like. There is. In addition to using the connector body 5 for connecting the two hose bodies 1, by connecting to one end of the hose body 1, it can be used for so-called one-sided pushing or one-sided stopping. You can also

Reference numeral 7 is a water blocking material injection port formed in the connector body 5, and this water blocking material injection port 7 is all water blocking material injection ports 7.
Although it may be formed as a single connector, the only connector main body 5 among the plurality of connector main bodies 5 used in one circuit formed by the waterproof hose connected by using the connector main body 5
It may be formed only on the. That is, at least one of the plurality of connector main bodies 5 used to connect the plurality of water blocking hoses has the water blocking material injection port 7.
You can use them individually.

In the connector main body 5 formed as described above, the overall shape including the joint portion 6 and the water blocking material injection port 7 is formed into a shape suitable for the place where the connector main body 5 is used. It is necessary, for example, as shown in FIG.
There are letter shape or T shape. That is, in the figure, (a)
Is suitable for use at the end of a waterproof hose, (b)
Is suitable for connecting two water blocking hoses at a corner, (c) is suitable for connecting two water blocking hoses in a straight line, and (d) is two at a corner. Suitable ones for vertically connecting the water shutoff hoses are shown.

After the pouring and curing of the precast concrete is completed, however, before the pouring of the postcast concrete, a water stopping hose is laid at the pouring position of the postcast concrete. In this case, the water blocking hose may be simply placed at the position, but it is necessary to fix it at this position in order to prevent accidental displacement and when laying this vertically (vertically). . When laying a water-stopping hose, the positional relationship is specified so that the sponge-like absorber 4 faces the precast concrete.

The method of fixing the water blocking hose is shown in FIG.
As shown in (a), for example, a method of driving a part of the nail 8 formed in an L shape into the precast concrete layer and supporting a water blocking hose at the other part of the nail 8, or the same figure ( As shown in (b), a method of fixing a part of the wire net 9 with nails 8'and covering the water shut hose as a whole while covering the water shut hose with the wire net 9 formed in a substantially S shape. is there.

Before or after laying the water-stopping hose in this way, the water-stopping hose is connected via the connector body 5, and the water-stopping hose is opened at the end of the hose body 1. The joint part 6 of the connector body 5 is connected to the injection path 2
It is possible to connect the water-stopping hoses by firmly inserting the.

The connecting device body 5 used here may be used by selecting one suitable for the position to be used from the one shown in FIG. 4, and the connecting device body 5 is also provided with the sponge-like absorbent body 4 '. Positioning so that it faces the surface is similar to laying a water shut off hose.

After that, the post-cast concrete is to be placed, but after this placement is completed, the water blocking material is poured from the water blocking material inlet 7 of the connector body 5. Then, this water blocking material is injected into the injection path 2 of the hose body 1 via the injection path 2'of the connector main body 5 to fill all the injection paths 2 and 2 '. When injecting the water blocking material, an appropriate pressure is required, but a part of the water blocking material is exposed to the outside through the slits 3 and 3 '(minimum discharge holes) formed in the hose body 1 and the connection tool body 5. At the same time as leaking out, the sponge-like absorbers 4 and 4'are impregnated, and the sponge-like absorbers 4 and 4'are restrained from moving out of the sponge-like absorbers 4 and 4 '.

As the water blocking material used here, a synthetic resin foam is used (injected) to uniformly and sufficiently expand the hose body, and after the synthetic resin foam is cured, the expanded state remains. It is intended to form a water-stop core, for which foaming resin (plastic foam) may be of any type (one-liquid type, two-liquid type), but urethane foam resin, foaming phenol resin, Foamed isocyanurate resin, foamed epoxy resin and the like are particularly suitable.

Further, as a general property of the foaming resin to be used, the viscosity thereof is 50 to 500 CP due to restrictions in use.
S or less, a curing time after starting (injecting) the reaction for 1 to 30 hours, and an expansion ratio of 5 or less are desirable, and a one-component resin (which reacts with water to foam) is preferable.

As the water-stopping material, a hydrophilic urethane resin (manufactured by Onoda Co., Trioject U, one-liquid type, a foaming agent is water) and a two-component urethane resin (manufactured by Shinei Master Co., two-liquid type, non-foaming) Those having a mixing ratio of 1: 1) had the following properties.

[0026]

With respect to the one-component resin, the change in expansion pressure with time is as shown in FIG. 6, and the tensile strength is 9 kgf.
/ Cm ^2, about 200% elongation. Furthermore, the adhesion strength with concrete is 7 kgf / cm ²
It was about (material breakage).

[0028]

As described above, according to the water stopping construction method for a concrete splicing portion according to the present invention, for injecting a water stopping material which is difficult to bend in one direction on the splicing surface between the pre-cast concrete and the post-cast concrete. By laying a hose and filling the water-stopping material injection hose with water-injection material, in the water-stopping method for the concrete splicing surface, which was designed to stop the water on the spouting surface, injecting the foaming injection material While continuously increasing the internal pressure in the water-stopping material injection hose, part of the water-stopping material is allowed to leak from the side surface of the water-stopping material injection hose to the splice joint surface, and solid filling of the splice joint portion is performed. It is possible to do this, and by arranging a connector at the end of the water blocking material injection hose, the water blocking material can be pushed or stopped and the water blocking material injection hose can be connected. Inject in addition to the material injection pressure Inflate the hose for injecting waterproofing material by utilizing its own foaming property, and at the same time, at the corners of the splicing part, etc., aim at the adhesion between the splicing hoses by the injecting material leaking around this hose. This has the effect that the hoses can be connected by the connecting tool and can be laid in a stable state.

[Brief description of drawings]

FIG. 1 (a) is a plan view conceptually showing one embodiment of a water stopping method for a concrete spliced joint according to the present invention, (b).
FIG. 7A is a sectional view taken along the line A-A of FIG.

FIG. 2 (a) is a perspective view showing an embodiment of a connector used in the present invention, and FIG. 2 (b) is a sectional view taken along line BB of (a).

FIG. 3 is a perspective view of a water stop hose for a concrete splicing part.

4A to 4D are plan views (A to C) and perspective views (D) showing examples of different shapes of the connector used in the present invention.

FIG. 5 is a perspective view showing a method for fixing a water stop hose for a concrete splicing part, (a) using nails,
(B) shows the one using a wire mesh.

FIG. 6 is a table showing changes over time in expansion pressure when a one-component hydrophilic urethane resin is used as a water blocking material used for a concrete splicing joint.

[Explanation of symbols]

 a hose b, b'injection channel c connection tool d precast concrete e post-cast concrete 1 hose body 2,2 'injection channel 3,3' slit 4,4 'sponge-like absorber 5 connection tool body 6 joint section 7 stop Water material inlet 8,8 'Nail 9 Wire mesh

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hitoshi Saito 3-10-3 Onaridai, Wakaba-ku, Chiba-shi, Chiba (72) Inventor Kuniichi Amana 252--20 Harajuku-cho, Totsuka-ku, Yokohama-shi, Kanagawa (72) Invention Toru Nemoto 1232-14 Miyayama, Samukawa-cho, Takaza-gun, Kanagawa Prefecture (72) Inventor Yukio Kamiyama 5-3-25 Motogo, Kawaguchi City, Saitama Prefecture

Claims (1)

[Claims] 1. A hose for injecting waterproofing material, which is difficult to bend in one direction, is laid on a jointing surface of precast concrete and postcasting concrete, and the injecting material is filled in the hose for waterproofing material injection. In a water stopping method for a concrete splicing surface designed to stop the water from the spouting surface, a foaming pouring material is injected to continuously increase the internal pressure in the hose for pouring the water blocking material, and Part of the water-stopping material injecting hose from the side surface to the splicing surface so that solid filling of the spouting portion can be performed, and a connector is attached to the end of the water-stopping material injecting hose. The method of waterproofing a concrete splicing part is characterized in that the water blocking material is pushed to one side or stopped and the hose for injecting the water blocking material is connected.