JPH0434228Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a water-stop sealing material for joints in structures such as box culverts and agricultural waterways.

[Prior art]

Examples of conventional water-stop sealing materials of this kind applied to box culverts are shown in FIGS. 3 to 5.

That is, the sealing material 1 is inserted between the female joint surface 3a and the male joint surface 4a at the end joints of the frame-shaped segments 3 and 4 in the box culvert 2, which is a structure.

The sealing material 1 is a long body made of water-expandable sealing material and having a cannonball-shaped cross section, and its base (i.e., the part corresponding to the butt) is connected to the joint 5 carved in the female joint surface 3a of the segment 3. Insert and set. After this setting, when the joint surfaces 3a and 4a of the segments 3 and 4 are joined, the head of the sealing material 1 will adhere to the male joint surface 4a in a crushed state, and the desired sealing function will be exhibited. becomes. In addition, the female joint surface 3a and the male joint surface 4a of the segments 3 and 4
The opposite sides are the male-type joint surface and the female-type joint surface, respectively.

[The problem that the idea attempts to solve]

However, the sealing material having such a structure has the following problems.

(1) When inserted into the joint 5, its head tends to fall down, which deteriorates water-stopping performance.

(2) It is easy to fall out from joint 5, which also leads to deterioration of water-stopping performance.

(3) Since it is sticky, it sticks to surrounding members, making it difficult to insert into the joint 5 and resulting in poor workability.

(4) Seal materials tend to adhere to each other, making product control difficult.

This invention was developed with a focus on these conventional problems, and is a water-stop sealing material that improves water-stop performance and workability, facilitates product management, and reduces costs. The purpose is to provide

[Means to solve the problem]

In order to achieve such an object, the present invention is a device that is inserted into a joint surface at a joint part of a structure segment, and in which both lower edges that are joined to one of the joint surfaces are connected to a head with extended gills. An elongated base body consisting of a body part on which a retaining claw is formed which is connected to the joint part and is inserted into a joint cut on the other side of the joint surface, and a body part formed on the head part of this base body and an end face of the body part, respectively. It is composed of a water-expandable sealant filled in the groove and a water-soluble tape attached to the head and body so as to cover the water-expandable sealant.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1 and 2, the sealing material 10 includes a long base body 13 consisting of a head 11 and a body 12 connected thereto, an end surface of the head 11, and a body 12.
The water-expandable sealants 14 and 15 are filled in the grooves 11a and 12a formed on the end faces of the head part 11 and the body part 12 so as to cover these water-expandable sealants 14 and 15. Water-soluble PVA (polyvinyl alcohol) tape 1
It consists of 6 and 17.

A space 11b with a flat cross section is formed in the head 11, and two protrusions 11 are formed in this space 11b.
c ₁ and 11c ₂ are formed. In addition, the body portion 12 has retaining claws 12b ₁ , 12b ₂ , 12b ₃ , 12b _{4 .}
A space 12c having a substantially square cross section is formed.

The base body 13 is made of thermoplastic rubber, synthetic rubber, or the like.

Both lower edges of the head 11 of the sealing material 10 have a shape with large gills. The body part 12 of the sealing material 10 is inserted into the joint 5 carved in the female joint surface 3a of the segment 3, and the head 11 is inserted into the joint 5 carved in the male joint surface 4 of the segment 4.
In addition to bonding to a, water-expandable sealant 1
4 and 15 are bonded to the male joint surface 4a and the bottom surface of the joint 5, respectively.

With this configuration, when the sealing material 10 is used for water-stopping the joint portions of the segments 3 and 4 of the box culvert 2, the body portion 12 is first inserted into the joint 5 of the segment 3. In this case, since the water-expandable sealants 14 and 15 are covered with water-soluble PVA tapes 16 and 17, they do not adhere to anything else and have little resistance, so the joint 5
The insertion work is extremely easy, and the work efficiency is improved. After being inserted into the joint 5, the retaining claws 12b ₁ , 12b ₂ , 12b ₃ , 12b ₄ prevent it from coming off, and the water-soluble PVA tape 17 melts due to moisture, causing the water-expandable sealant 15 to close to the joint. By adhering it to the bottom surface of 5, this retaining effect will be doubled.

In this state, if the joint surfaces 3a and 4a of the segments 3 and 4 are joined together, the head 11 of the sealant 10 will be crushed, the water-soluble PVA tape 16 will melt due to moisture, and the water-expandable sealant 14 will become male. It adheres to the mold joint surface 4a and exhibits the desired sealing function. In this case, the head 11 with stretched gills is firmly supported by the outer edge of the joint 5, so it does not fall down, and therefore the water-expandable sealant 14 filled in the groove 11a of the head 11 is accurately It adheres to the planned adhesive surface, and as a result, the joint 5
Combined with the fact that the body part 12 is difficult to come off, good water-stopping performance can be obtained.

In addition, before this sealing material 10 is used, the water-expandable sealing materials 14 and 15 are water-soluble.
Since it is covered with PVA tapes 16 and 17, the sealants do not adhere to each other, making product management easy. Furthermore, since less water-expandable sealants 14 and 15, which are generally expensive, are required, costs can be reduced.

〔effect〕

As explained above, according to the present invention, the following effects can be obtained.

(1) Improved water-stop performance.

(2) Improved workability.

(3) Product management can be made easier.

(4) Cost can be reduced.

[Brief explanation of drawings]

Figure 1 is a perspective view showing a part of the water-stop sealing material of the present invention in cross section, Figure 2 is an explanatory diagram of its usage, and Figure 3 is a conventional water-stopping sealant applied to a box culvert. FIG. 4 is a sectional view taken along the line -- in FIG. 3, and FIG. 5 is an enlarged sectional view of a main part thereof. 3, 4... Segment, 3a, 4a... Joint surface, 5... Joint, 10... Seal material, 11... Head, 11a... Groove, 12... Body, 12a...
Grooves, 12b ₁ , 12b ₂ , 12b ₃ , 12b ₄ ... Retention claws, 13 ... Base, 14, 15 ... Water-expandable sealing material, 16, 17 ... Water-soluble PVA tape.

Claims (1)

[Scope of utility model registration request] The device is inserted into a joint surface at a joint portion of a structure segment, and both lower edges connected to one of the joint surfaces have a head with gills extending therefrom and are carved on the other joint surface. An elongated base body consisting of a body part formed with a retaining claw that is inserted into a joint, and a water-expandable sealant filled in grooves formed in the head part of the base body and the end face of the body part, respectively. ,
A water-stopping sealing material comprising a water-soluble tape attached to the head and body so as to cover the water-expandable sealing material.