JP2941775B1 - Water stop device for concrete joint - Google Patents

Abstract

An object of the present invention is to greatly simplify the operation of placing concrete after casting. SOLUTION: Precast concrete 1 is cast between formwork 2s. When the pre-cast concrete 1 is almost dried, a groove 4 is formed at the upper end thereof using a grinding wheel 3 or the like. After the water-stopping member 5 is installed in the groove 4, a post-cast concrete 6 is cast. The water blocking member 5 is composed of a main body 7 made of non-vulcanized butyl rubber and an outer skin 8 covering the upper end surface and both side surfaces of the main body 7.
The outer skin 8 is made of a coating made of polyvinyl alcohol. Since the outer skin 8 is dissolved by the moisture in the post-cast concrete 6, unlike the release paper conventionally used, the post-cast concrete 6
There is no need to remove it when casting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopping device for a concrete splicing part when a post-cast concrete is cast continuously to a pre-cast concrete, and in particular, concrete which can greatly improve workability. The present invention relates to a water stop device for a joint.

[0002]

2. Description of the Related Art Conventionally, after a precast concrete has been cast, a water-stopping member is arranged at a joint at the upper end of the concrete, and the post-cast concrete is cast. A method for preventing water from flowing into a concrete joint is known in general, and it is customary to use an adhesive non-vulcanized butyl rubber as the water stopping member.

[0003]

In the case of non-vulcanized butyl rubber, the carboxyl group reacts with the CaO component in the cement to form an ionic bond. Has the advantage of being able to completely prevent water leakage between the pre-cast concrete and the post-cast concrete, but non-vulcanized butyl rubber has Because of its properties, it is easy for dust and the like to adhere, so after the water-stopping member is placed on the pre-cast concrete, the surface of the water-stop member is covered with release paper until the post-cast concrete is poured. It is necessary to remove the release paper immediately before placing the post-cast concrete. In addition, there is a problem that workability is extremely poor because the removal work has to be performed between the reinforcing bars arranged on the precast concrete in some cases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and eliminates the work of removing release paper that had been performed immediately before placing post-cast concrete, thereby greatly improving workability. It is an object of the present invention to provide a water stop device for a part.

[0005] Another object of the present invention is to provide a water stop device for a concrete splicing portion in which a water stop member can be easily manufactured.

Another object of the present invention is to provide a water stopping device for a concrete splicing portion in which a water stopping member installed at the end of the pre-cast concrete does not have a risk of moving when the post-cast concrete is poured. It is in.

SUMMARY OF THE INVENTION An object of the present invention is to provide a water stopping device for a concrete splicing section which can completely omit release paper used for preventing the adhesion of dust and the like.

Still another object of the present invention is to provide a water stopping device for a concrete splicing section which can greatly improve workability.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a concrete jointing section in which after precast concrete is cast, postcast concrete is continuously connected to the end of the precast concrete via a waterproof member. In the water stopping device, the water stopping member is constituted by a long body having at least an outer surface made of non-vulcanized butyl rubber and a water-soluble outer skin covering at least a part of the outer surface of the body. It is characterized by. And by coating the outer surface of the main body with the outer skin, the release paper that covers the outer surface of the main body becomes unnecessary, and the work of removing the release paper that was performed immediately before placing the post-cast concrete can be omitted. Becomes For this reason, it is possible to leave the water-stopping member installed at the end of the pre-cast concrete and leave the post-cast concrete immediately at an optimal timing, thereby greatly improving the workability. .
In addition, since the outer skin is water-soluble, the outer surface of the main body is exposed by being melted by the moisture in the cast concrete after being placed. For this reason, the main body and the post-cast concrete come into direct contact, and it is possible to secure a sufficient ionic bonding state.

[0010] The present invention is also characterized in that the outer skin is formed by a coating made of polyvinyl alcohol. By the way, this polyvinyl alcohol is also used when uniformly adding and kneading an additive to cement, and there is no possibility of adversely affecting the cement. For this reason, there is no possibility that a problem occurs in the concrete joint portion due to the presence of the outer skin.

The present invention also provides a water stopping device for a concrete splicing section in which a pre-cast concrete is cast, and then a post-cast concrete is continuously connected to the end of the concrete through a water shut-off member. At least an outer surface of a long body made of non-vulcanized butyl rubber; and a non-vulcanized butyl rubber-based outer skin that covers at least a part of the outer surface of the main body and has little or no tackiness. It is characterized by the following. By the way, although the outer cover is not water-soluble, it is a non-vulcanized butyl rubber-based material, so its performance is inferior to that of the non-vulcanized butyl rubber, but an ionic bond with concrete can be expected. Further, when the main body is deformed flat due to the weight of the post-cast concrete, the main body is eroded out of the outer skin, and complete ionic bonds are formed in this portion.

The present invention is also characterized in that the main body is formed in a rectangular shape having a horizontally long cross section, and at least the upper end surface of the main body is covered with an outer cover. And this gives
The water-stopping member can be easily manufactured, and the installation state of the water-stopping member at the end of the precast concrete can be stabilized.

The present invention is also characterized in that the upper end surface and one side surface of the main body are covered with a skin. Thus, the lower end surface of the main body having a large area can be adhered and fixed to the end of the precast concrete due to the adhesiveness of the non-vulcanized butyl rubber, and the installation stability of the water blocking member is improved. It becomes possible. In addition, since the other side surface of the main body is exposed, it is easy for the main body to be exposed to the outside of the outer skin by the weight of the post-cast concrete, and sufficient ionic bonding is possible.

The present invention is also characterized in that the upper end surface and both side surfaces of the main body are covered with a skin. Thus, it is possible to completely prevent dust and the like from adhering to the water-stopping member while securing the installation stability of the water-stopping member at the end of the precast concrete.

The present invention is also characterized in that the lower end surface of the main body is covered with a release paper which is removed at the time of use. This makes it possible to prevent dust and the like from adhering to the lower end surface of the main body before using the water stopping member, and the handling is easy.

The present invention is also characterized in that the upper end surface, both side surfaces and the lower end surface of the main body are covered with a skin. As a result, a release paper for covering the adhesive surface of the main body is not required at all, and the construction is easy and the handling is easy.

The present invention is further characterized in that the water-stopping member is wound in a tape shape around the outer peripheral surface of the core material.
In this way, it becomes possible to store the long water-stopping member in a small size, and it is possible to greatly improve the workability by sequentially releasing the outer water-end member from the outer end side during use and installing it at the end of the precast concrete. It becomes possible.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 (a) to 1 (d) show a method of stopping water at a concrete splicing portion using a water stopping device according to a first embodiment of the present invention. A pre-cast concrete to be poured in between. The upper end of the pre-cast concrete 1 has a groove having a predetermined depth and a predetermined width by, for example, a grinding wheel 3 after the pre-cast concrete 1 is dried or in a dry state. 4 are formed. And this groove 4
Inside, a water-stopping member 5 which will be described in detail later is arranged and fixed, and afterward, a post-cast concrete 6 is cast above the pre-cast concrete 1.

As shown in FIG. 2, the water-stopping member 5 has a band-shaped main body 7 having a horizontally long rectangular cross section,
And a release paper 9 for covering the lower end surface of the main body 7.
Are removed when the water blocking member 5 is used.

The main body 7 is formed of an adhesive non-vulcanized butyl rubber, and the outer skin 8 is formed of a water-soluble coating, for example, made of polyvinyl alcohol. Due to the adhesiveness of the butyl rubber, the butyl rubber is integrally adhered and fixed to the main body 7. The outer skin 8 prevents dust and the like from adhering to the main body 7. This will be described later in detail.

The water stopping member 5 configured as described above is similar to that of FIG.
As shown in the figure, the outer surface of the core material 10 is wound in a tape shape, for example, with the release paper 9 inside, and the water stopping member 5 is sequentially wound from the outer end side. After the release and release of the release paper 9 in the released portion, the release paper 9 is placed in the groove 4 of the precast concrete 1.

Next, the operation of the present embodiment will be described. When stopping water at the concrete joint, first
As shown in FIG. 1 (a), a pre-cast concrete 1 is poured between the formwork 2 and, after the pre-cast concrete 1 is dried or in a dry state, as shown in FIG. The groove 4 is formed by using a grinding wheel 3 or the like.

Next, as shown in FIG. 1 (c), the water-stopping member 5 from which the release paper 9 has been removed is disposed in the groove 4, and the lower end surface of the main body 7 is attached and fixed to the bottom of the groove 4. And in this state,
It is left until the time for placing the post-cast concrete 6.

At this time, if there is no outer skin 8,
Since the outer surface of the main body 7 made of non-vulcanized butyl rubber is exposed to the outside, dust adheres to the outer surface of the main body 7 and the adhesiveness with the post-cast concrete 6 when the post-cast concrete 6 is cast. There is a problem of getting worse. For this reason, conventionally,
Although the outer surface of the main body 7 is covered with release paper, and the release paper is removed immediately before placing the post-cast concrete 6, this operation is not always easy, and is a bottleneck in the water stopping operation.

However, in the present embodiment, since the upper end surface and both side surfaces of the main body 7 exposed to the outside are covered with the outer skin 8, dust and the like can be removed even if the conventionally required release paper is omitted. There is no danger of sticking to the outer surface of the main body 7.
Moreover, since the release paper can be omitted, it is not necessary to remove the release paper immediately before placing the post-cast concrete 6, and the workability can be greatly improved.

When it is time to transfer the post-cast concrete 6, a not-shown formwork is installed, and then the post-cast concrete 6 is cast as shown in FIG. Afterwards, the back-cast concrete 6 is transferred.

At this time, the post-cast concrete 6 is
Since the outer skin 8 is cast without removing it, the main body 7 and the back-cast concrete 6 do not come into direct contact with each other, but since the outer skin 8 is made of polyvinyl alcohol and has water solubility, it is cast. The outer skin 8 is melted by the moisture in the post-cast concrete 6, and the post-cast concrete 6 and the main body 7 can be brought into direct contact. For this reason, the carboxyl group of the non-vulcanized butyl rubber reacts with the CaO component in the cement to form an ionic bond, whereby an adhesive force greater than mere adhesion is obtained, and there is no problem associated with providing the outer skin 8 at all. .

However, the conventionally required release paper is omitted, and the outer surface of the main body 7 is covered with the water-soluble outer skin 8, so that the release paper performed immediately before the post-cast concrete 6 is cast. Work can be omitted, and workability can be greatly improved.

In the first embodiment,
Although the case in which the outer cover 8 is formed of a film made of polyvinyl alcohol has been described, another water-soluble substance such as an oblate can be used as long as it is a water-soluble substance that does not adversely affect the concrete.

FIG. 4 shows a second embodiment of the present invention, in which only the upper end surface of a main body 7 is covered with a skin 8. In other respects, the configuration is the same as that of the first embodiment, and the operation is the same.

In this embodiment, both side surfaces of the main body 7 are exposed. However, a non-vulcanized butyl rubber plate having a large area is prepared, and its upper surface is covered with a skin sheet and its lower surface is formed. If the water-stopping member 5 can be manufactured by covering with a release sheet and cutting it into a strip shape, the water-stopping member 5 can be manufactured at low cost. Also, when the water-stopping member 5 is deformed flat due to the weight of the post-cast concrete 6, the new non-vulcanized butyl rubber inside the main body 7 becomes easy to bleed out, and complete ionic bonds are formed in the bleeding part. Can be expected.

FIG. 5 shows a third embodiment of the present invention, in which an upper end surface and one side surface of a main body 7 are covered with a skin 8. In other respects, the configuration is the same as that of the first embodiment, and the operation is the same.

In this embodiment, however, only one side of the main body 7 is exposed, so that the amount of dust and the like adhered to the main body 7 is reduced, and the main body 7 shown in FIG.
Prepare a non-vulcanized butyl rubber plate having twice the width of the above, cover the upper surface and both side surfaces with a skin sheet, cover the lower surface with a release sheet, and divide it in two in the width direction to stop water. Since the member 5 is formed, the manufacture of the water blocking member 5 is relatively easy.

FIG. 6 shows a sixth embodiment of the present invention, in which an upper end face, both side faces and a lower end face of a main body 7 are covered with an outer cover 8.
And the release paper 9 (see FIG. 2) can be omitted. For other points, the first
This embodiment has the same configuration as the above embodiment, and the operation is the same.

In the present embodiment, however, since the release paper 9 can be omitted, the work at the time of construction becomes simpler, and even a layman can easily perform the construction. On the other hand, there is a problem that the water blocking member 5 cannot be stuck and fixed in the groove 4. However, as long as the water stopping member 5 is arranged in the groove 4, there is no practical problem. In some cases, the groove 4 is formed with a pressing die immediately after the casting of the precast concrete 1 and the water-stopping member 5 is installed immediately thereafter. Since it is melted by the water in the concrete, the lower end surface of the main body 7 can be fixed to the groove 4.

FIG. 7 shows a fifth embodiment of the present invention. In place of the outer skin 8 in the first embodiment, FIG.
The outer skin 18 is used.

That is, the outer skin 18 is formed of a non-vulcanized butyl rubber-based material having little or no adhesiveness, and the outer skin 18 is formed on the upper end surface and both side surfaces by the adhesiveness of the main body 7. It is designed to be adhered to and fixed to. As the outer cover 18, for example, "Santa Couch" (trade name) manufactured by Hayakawa Rubber Co., Ltd. is used. For other points,
The configuration is the same as that of the first embodiment, and the operation is the same.

However, in the present embodiment, since the outer cover 18 is not water-soluble,
Although the outer skin 18 is not melted and disappeared even if it is cast, since the outer skin 18 is formed of a non-vulcanized butyl rubber-based material, ionic bonding to the post-cast concrete 6 can be expected to some extent. . Further, when the main body 7 is crushed by the weight of the post-cast concrete 6 and deformed to be flat, a part of the main body 7 projects out of the outer skin 18, so that complete ionic bonding can be obtained in this part.

In the fifth embodiment,
Although the case where the upper end surface and both side surfaces of the main body are covered with the outer skin 18 has been described, only the upper end surface of the main body 7 may be covered with the outer skin 18 as shown in FIG.
As shown in FIG.
Alternatively, as shown in FIG. 6, the entire periphery of the main body 7 may be covered with an outer skin 18. However, when the entire periphery of the main body 7 is covered with the outer skin 18, it is preferable that the outer skin 18 be divided at each corner or the like of the main body 7 so that the main body 7 can easily eat out of the outer skin 18.

Further, in each of the above embodiments, the case where the water blocking member 5 has a rectangular shape having a horizontally long cross section has been described. However, the cross sectional shape is not particularly limited, and may be, for example, a semicircular shape.

In each of the above embodiments, the case where the water blocking member 5 is disposed in the groove 4 formed in the precast concrete 1 has been described. However, when the condition of the precast concrete 1 is good, The water blocking member 5 may be directly disposed without providing the groove 4. Further, the present invention can be applied to not only vertical concrete joining but also lateral concrete joining. The main body 7 does not need to be entirely made of non-vulcanized butyl rubber. For example, the outer peripheral surface of a normal rubber core may be wrapped with non-vulcanized butyl rubber to form the main body 7.

[0042]

As described above, according to the present invention, the water-stopping member comprises a main body having at least an outer surface formed of a non-vulcanized butyl rubber and a water-soluble outer skin covering at least a part of the outer surface of the main body. Since it is configured as above, the release paper which had to be removed immediately before the post-cast concrete is conventionally dispensed with becomes unnecessary, and the workability can be greatly improved. Moreover, since the outer skin is water-soluble, the outer surface of the main body is exposed by being melted by the moisture in the cast-in-placed concrete, and the main body and the cast-in-place concrete come into direct contact. Can be secured.

Further, in the present invention, since the outer skin is formed of a film made of polyvinyl alcohol, there is no problem that the concrete joint portion is adversely affected by providing the outer skin.

The present invention also provides a water-stopping member comprising: a main body having at least an outer surface formed of a non-vulcanized butyl rubber; and a non-vulcanized butyl rubber. And vulcanized butyl rubber-based outer skin; therefore, the outer skin itself and the post-cast concrete can be bonded by ionic bonding. Further, when the main body is deformed flat by the weight of the post-cast concrete, the main body will eat out of the outer skin, but a complete ionic bonding state can be secured in this portion.

According to the present invention, the main body is formed in a rectangular shape having a horizontally long cross section, and at least the upper end surface of the main body is covered with the outer cover, so that the water stopping member can be easily manufactured. It is possible to stabilize the installation state of the water stopping member on the end of the precast concrete.

According to the present invention, since the upper end surface and one side surface of the main body are covered with the outer cover, the lower end surface of the main body having a large area can be pre-cast by utilizing the adhesiveness of non-vulcanized butyl rubber. Can be stuck and fixed to the end, and the installation stability of the water blocking member can be improved. Further, since the other side surface of the main body is exposed, it is easy for the weight of the post-cast concrete to extrude outside the outer skin of the main body, and a sufficient ionic bonding state can be obtained.

According to the present invention, since the upper end surface and both side surfaces of the main body are covered with the outer skin, it is possible to secure the installation stability of the water-stopping member at the end of the precast concrete while maintaining the water-stopping member. Can be completely prevented from adhering.

According to the present invention, since the lower end surface of the main body is covered with the release paper which is removed at the time of use, it is possible to prevent dust and the like from adhering to the lower end surface of the main body before using the water stopping member. And easy to handle.

Further, according to the present invention, since the upper end surface, both side surfaces and the lower end surface of the main body are covered with the outer skin, a release paper for covering the adhesive surface of the main body is not required at all, and the construction is easy. , Easy to handle.

Further, in the present invention, since the water-stopping member is wound around the outer peripheral surface of the core material in a tape shape, the long water-stopping member can be stored in a small size, and the outer end side can be used at the time of use. By sequentially releasing them from the concrete and installing them at the end of the precast concrete, the workability can be greatly improved.

[Brief description of the drawings]

1 (a) to 1 (d) are explanatory diagrams sequentially showing a method for stopping water at a concrete joint portion using a water stopping device according to a first embodiment of the present invention in accordance with procedures.

FIG. 2 is an enlarged sectional view showing details of a water stopping member of FIG. 1;

FIG. 3 is an explanatory view showing a state in which the water blocking member of FIG. 2 is wound around an outer peripheral surface of a core material.

FIG. 4 is a diagram corresponding to FIG. 2, showing a second embodiment of the present invention.

FIG. 5 is a diagram corresponding to FIG. 2, showing a third embodiment of the present invention.

FIG. 6 is a diagram corresponding to FIG. 2, showing a fourth embodiment of the present invention.

FIG. 7 is a diagram corresponding to FIG. 2, showing a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pre-cast concrete 2 Formwork 3 Grinding wheel 4 Groove 5 Water stopping member 6 Post-cast concrete 7 Main body 8, 18 Outer skin 9 Release paper 10 Core material

Claims (8)

(57) [Claims] 1. A water stopping device for a concrete splicing section in which a pre-cast concrete is cast and a post-cast concrete is continuously connected to the end of the concrete through a water shut-off member. A water stop device for a concrete concrete joint, comprising: a long body made of non-vulcanized butyl rubber; and a water-soluble skin covering at least a part of an outer surface of the body. 2. The water stopping device for a concrete splicing part according to claim 1, wherein the outer skin is formed of a coating made of polyvinyl alcohol. 3. A body forms a cross-sectionally oblong rectangular shape, the outer skin is the body at least, characterized in that the upper end face covers claim 1 or 2 concrete joints waterproof device according . 4. The water stopping device for a concrete splicing part according to claim 3 , wherein the outer cover covers an upper end surface and one side surface of the main body. 5. The water stopping device for a concrete joint according to claim 3 , wherein the outer cover covers the upper end surface and both side surfaces of the main body. The lower end face of 6. body according to claim 4 or characterized in that it is coated with a release paper that is removed at the time of use
5. The water stopping device for a concrete joint part according to 5 . 7. The waterproofing device for a concrete splicing part according to claim 3 , wherein the outer cover covers the upper end surface, both side surfaces and the lower end surface of the main body. 8. The water stopping member is wound in a tape shape around an outer peripheral surface of a core material.
4,5, waterproofing apparatus of concrete joints of 6 or 7, wherein.