JPH0116813Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water stop plate to be used at a joint between old and new concrete structures.

As is well known, when constructing a concrete structure by pouring concrete, especially when constructing a structure by pouring joints, concrete volume shrinkage due to changes in temperature or moisture or drying occurs at the joints of the structure. In order to prevent cracks that occur in concrete due to various factors such as uneven settlement of concrete, load, or vibration, expandable joints are inserted at appropriate intervals. At this joint, a band-shaped water stop plate is used that connects the new and old concrete. This water stop plate prevents rainwater, spring water, and other water from penetrating into the joints.

This water stop plate is often made of vinyl chloride resin, and in this case, it is called a center valve type flat, center valve type corrugate, or uncut type corrugate, as specified by the Japanese Industrial Standards. ing. When viewed from the cross section of the water stop plate, all of these water stop plates are symmetrical with respect to a curved portion provided in the center, and further have a circular bulge at the tip. As an example of this, an uncut corrugate is shown in FIG. As is clear from Figure 1,
If only half of the water stop plate 2 is embedded in the concrete 1 that has already been poured, as shown by the chain line, in order to pour new concrete 3 there, it is natural to use the conventional water stop plate 2. However, if you want to add unplanned concrete to the existing concrete 1 in which the water stop plate 2 has not been embedded, attach the water stop plate 2 to the existing concrete 1 as shown by the solid line. concrete anchor 4
In this case, the shape and size of the conventional water stop plate 2 may have unnecessary parts, and the adhesive material 5 may not fit well with the water stop plate 2. There were also complaints about the lack of reliability in preventing water seepage after burial.

Therefore, this invention was devised in order to eliminate the problems when using these embedded water stop plates, and aims to provide a water stop plate specifically for the joint between existing concrete and new concrete. purpose.

Hereinafter, the embodiment of the present invention shown in FIG. 2 will be described in detail. Figure 2 is a cross-sectional view, and the water stop plate 2 is 10
It consists of a band-shaped body with a length of ~20 m, and the cross section is shown here.

A U-shaped protrusion 7 is provided in the middle of the base plate 6 of the water stop plate 2, and the base plate 6 can be bent as shown in the figure. On one side of the protrusion 7, several ribs 8, 8 are provided on both sides of the base plate 6, and edges 9 that swell to both sides are provided in parallel at the tip, and a plate part 10 for embedding is embedded in the new concrete. is formed. The other side of the protrusion 7 has a serrated surface 1 on one side of the substrate 6.
1, and a hook-shaped end flange 12 is provided at the tip to form an attachment plate portion 13. 14 is a mounting mark for the concrete anchor 4, 15 is a steel plate, and an unvulcanized butyl rubber sheet 16 is used as a sealing material.
Reference numeral 17 denotes a fixing flange protrudingly provided on the outer periphery of the protruding portion 7, which locks the fixing fitting 18 and fixes the newly installed formwork 20.

With the above configuration, the concrete anchor 4 is planted in the existing concrete 1, and a primer 19 is applied to smooth the concrete surface in the vicinity of the concrete anchor 4. An unvulcanized butyl rubber sheet 16 is inserted into the concrete anchor 4 and brought into contact with the primer 19. Next, the serrated surface 11 of the water stop plate 2 is inserted into the concrete anchor 4 and brought into contact with the rubber sheet 16, and then the band-shaped steel plate 15 is brought into contact from the outside of the water stop plate 2, and finally, the anchor nut is screwed. and tighten. As a result, the edge flange 12, the serrated surface 11 and the existing concrete surface form a bag by which the rubber sheet 16 is enclosed.

If a flange similar to the edge flange 12 is provided below the concrete anchor 4 and symmetrically to the illustrated edge flange 12, it is also possible to receive the liquid sealant.

Incidentally, the work of placing the embedding plate part 10 of the board 6 is as follows:
Construction will continue as usual.

The present invention has the following effects.

(1) When attaching a water stop plate to existing concrete, the serrated surface for joining the sealant on the attachment plate of the water stop plate presses the sealant and attaches it to the concrete, so there is no need to waste excess water. The water stop plate can be attached closely without creating any space.

(2) Unlike the case where a conventional water stop plate for embedding is used as is, the sealant covers the entire surface of the attachment plate, so there is no unnecessary water stop plate left without sealant.

(3) Since no extra space or unnecessary water stop plate is created, seepage water can be stopped reliably.

(4) The attachment plate part is shorter than the embedding plate part, so
Water stop plate material can be saved.

(5) If hook-shaped flanges are formed on the attachment plate at two locations on the edge and at the bottom at a distance from the edge, the hook-shaped flange, the rough surface for joining, and the concrete surface will form a bag, and the liquid seal will be sealed. Not only does this make it possible to use sealing material, but the bag is filled with sealing material to ensure attachment.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the conventional example in use, and FIG. 2 is a sectional view of the embodiment of the present invention in use. 2 is a water stop plate, 7 is a protruding part, 10 is an embedding plate part,
11 is a serrated surface, and 13 is a plate for attachment.

Claims (1)

[Scope of utility model registration request] A synthetic resin water stop plate used when pouring new concrete onto existing concrete, which has a relatively flat attachment plate part that is fixed along the existing concrete wall surface, and an embedded part that is embedded in the new concrete. The attaching plate part is composed of a protruding part having a substantially U-shaped cross section that bendably connects the attaching plate part and the embedding plate part, and the attaching plate part is attached to the existing concrete wall with a separately prepared sealing material. a barbed edge flange and an adjacent serrated surface on the opposite side of the U-shaped projection suitable for engagement through the U-shaped projection; 1. A water stop plate for joining old and new concrete, characterized in that it has an edge and a plurality of ribs parallel to the edge and projecting to both sides, and the width of the attachment plate is smaller than the width of the embedding plate.