JPH0423633Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Technical field) This invention relates to a water-stop waterproofing material used for insulating wall panels of building structures and waterproofing the joints of U-shaped grooves and drain pipes buried in the ground. It is.

(Prior art) Insulation of wall panels of building structures, U-shaped grooves,
As one of the waterproof means for the joints of drain pipes and the like, a water-stop waterproofing material disclosed in, for example, Japanese Unexamined Patent Publication No. 140993/1983 has been adopted. As shown in Fig. 1, this water-stop waterproofing material consists of upper and lower layers 1 and 2 made of a material having water permeability and flexibility, for example, a band-shaped nonwoven fabric made of synthetic resin fiber.
It has a three-layer structure with a waterproof layer 3 made of dry bentonite powder located in the middle.

The upper and lower layers 1 and 2 are sewn together at regular intervals in one direction, and a parallel tubular part 4 is provided between them, and the dried bentonite powder is filled into this tubular part 4 to make it waterproof. It constitutes layer 3. And the seam part of the upper and lower layers 1 and 2 is
It is relatively easy to leave.

This waterproof material is then wrapped around the outer periphery of a structural joint that requires waterproofing, such as a drainage pipe joint (not shown), and is buried in the ground together with the drainage pipe, and has a waterproof effect as shown below. demonstrate.
That is, water flowing through the drain pipe or moisture contained in the soil permeates the upper and lower layers 1 and 2, enters the waterproof layer 3, and moistens the dried bentonite. This moisture swells the bentonite powder, increasing its volume and turning it into a highly fluid sol-like colloid. Due to the swelling, the pressure in the tubular part 4 increases, and the colloidal bentonite powder particles spread out the seamed part of the upper and lower layers 1 and 2, forming a continuous waterproof layer 3 in correspondence with the adjacent tubular parts 4. At the same time, the water-stopping waterproof material adheres closely to the periphery of the drain pipe. The particles of colloidal bentonite powder form a three-dimensional network structure, and the excess water gradually diffuses and solidifies into a gel-like structure, completing a fine waterproof layer 3 around the joint of the drain pipe.

However, this kind of water-stop waterproofing requires only the upper and lower layers 1,
It takes a lot of man-hours to sew the two pieces together at regular intervals. Further, there was a problem that filling the tubular portion 4 with the waterproof layer (dried bentonite powder) was not easy.

Furthermore, although the upper and lower layers 1 and 2 are sewn together relatively easily, the swelling caused by water absorption of the bentonite powder ensures that the sewn parts separate and the adjacent waterproof layers 3 correspond to each other. It has been quite difficult to manufacture waterproofing materials that create a continuous waterproof layer without breaks.

(Purpose of the invention) In view of the above circumstances, this invention provides a water-stop waterproofing material with a three-layer structure consisting of two upper and lower layers and an intermediate waterproofing layer, which is easy to manufacture and has an unbroken and uniform waterproofing layer. The purpose is to

(Example) An example of this invention will be described below with reference to the drawings.

The waterproof material according to the embodiment has a three-layer structure as shown in FIG. That is, the upper layer 1 is made of a water-permeable flexible material made of layered fibers loosely intertwined with each other, and in this embodiment, a nonwoven fabric is used.

The lower layer 2 is also a fibrous layer made of a water-permeable flexible material. The waterproof layer 3 is a dried colloidal material filled between the upper and lower layers 1 and 2, and in this embodiment, dried bentonite powder is used. Each of the layers 1, 2, and 3 may be made of the same material as in the prior art described above, except for the above-mentioned conditions for the upper layer 1. Therefore, the lower layer 2 may be made of paper, a sheet made of a synthetic material, or the like. be.

The upper and lower layers 1 and 2 and the waterproof layer 3 are combined in the following manner to form a single sheet as a whole. That is, some of the fibers 6 of the upper layer 1 are bonded to the waterproof layer 3 at bonding points 5 that are densely distributed on its surface.
It perpendicularly penetrates the lower layer 2 and intertwines with the fibers of the lower layer 2 at the end to bind the upper and lower layers 1 and 2, and furthermore, the bentonite powder of the intermediate waterproof layer 3 is firmly held between the fibers 6 of each bonding point 5. There is.

A waterproof material having such a structure can be manufactured by needle punching as shown in FIG. That is, a needle holder 8 in which a large number of needles 9 are erected downward is attached to the lower surface of the ram 7 of the needle punching machine. The position is determined relative to the base plate 11 provided.
A lower layer 2 feed conveyor 12 is provided on the same plane on one side of the base plate 11, and a hopper 13 is installed above the conveyor 12, into which dry bentonite powder is filled. This hopper 13
An upper layer 1 feed roller 14 is provided in front of the feed conveyor 12 at a distance. lower layer 2
is placed on the feed conveyor 12 from the left side in the figure and fed toward the base plate 11. A certain amount of dry bentonite powder is supplied from the hopper 13 onto the lower layer 2, placing the waterproof layer 3 thereon. On top of this waterproof layer 3, an upper layer 1 is provided with a feed roller 1.
4 are superimposed from above, and these three layers are fed onto the base plate 11. Here, the three layers 1, 2, and 3 are densely punctured by the needle 9 of the ram 7 that moves up and down in synchronization with the feed speed, and at this time, some of the fibers 6 of the upper layer 1 are first drawn in with the needle 9 and waterproofed. It pierces the layer 3, the lower layer 2, and then, with the rise of another needle 9, its end is drawn upwards again to connect the upper and lower layers 1, 2 and the waterproof layer 3 in succession. Needless to say, the position where the needle 9 punctures becomes the above-mentioned connection point 5.

The waterproofing material constructed as described above can be manufactured continuously, can be easily automated, and can be manufactured at low cost with stable quality.

Its usage is the same as in the conventional case, such as drain pipes and
It is used by wrapping it around the outer circumference of joints such as grooves, but
Since the waterproof layer 3 is a continuous layer with a constant thickness, there is no directionality, and it can be easily bent and wrapped in any direction, and there is no fear that the waterproof layer 3, which has become a water-absorbing gel, will be cut off. Can be reliably waterproof.

(Effects of the invention) As explained above, in this invention, at least one of the upper and lower two layers of the water-stop waterproofing material is made of non-woven fabric, and some fibers of this non-woven fabric penetrate the waterproof layer and other layers of the upper and lower layers. By holding the three layers in the form of a single sheet, it is easy to manufacture, and during use, it is possible to reliably form a continuous waterproof layer with no breaks. .

[Brief explanation of the drawing]

Figure 1 is a perspective view of a water-stop waterproofing material according to the prior art.
FIG. 2 is a partial sectional view of a waterproofing material according to an embodiment, and FIG. 3 is a longitudinal sectional view illustrating a manufacturing process of the waterproofing material according to an embodiment. 1...upper layer, 2...lower layer, 3...waterproof layer, 6...
...Some fibers in the upper layer.

Claims (1)

[Scope of utility model registration request] In a water-stop waterproofing material with a three-layer structure consisting of two upper and lower layers made of a water-permeable flexible material and an intermediate waterproof layer made of a dried colloidal substance filled between the upper and lower two layers, the upper and lower two layers are At least one layer is made of non-woven fabric, and some fibers of this non-woven fabric penetrate the waterproof layer, the upper and lower two layers, and the colloidal drying material in the middle, holding the three layers in the form of a single sheet. A water-stop waterproof material with special features.