JPH0612026Y2 - Tarpaulin for civil engineering - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> The present invention relates to a tarpaulin for civil engineering work used in revetment construction and the like.

<< Prior Art >> This type of waterproof sheet is used, for example, as a backfill material for articulated blocks and rock-fill layers in revetment work.
As shown in the figure, it is laid on a slope b formed on a bank such as a river, and blocks c are sequentially laid on this waterproof sheet a to block water intruding from the block joints and to block the block joints. It is intended to prevent the sediment from flowing out through the gap and being washed. The waterproof sheet a includes a water-blocking vinyl chloride sheet d as shown in FIG.
The felt e for protecting the vinyl chloride sheet d and the cloth material f are integrally laminated.

Further, in Japanese Utility Model Laid-Open No. 49-20928, when a waterproof sheet is laid on the slope, a water-permeable member is interposed between the ground side and the waterproof sheet (lining layer), and the lower portion of the water-permeable member is provided. There is known a technique for burying a drainage pipe in a communicating manner. The water-permeable member is a sheet-like member having high water permeability, and when water enters the back side of the waterproof sheet, it flows down through the water-permeable member and drains from the drain pipe to prevent erosion on the back side of the waterproof sheet. To do.

Incidentally, another conventional technique for preventing the erosion of the back surface side of the waterproof sheet is to attach a drainage part to a part of the waterproof sheet as in Japanese Utility Model Laid-Open No. 61-188625, and There is also one that allows water to flow from the back side of the seat to the front side. The drainage part has a structure in which a small drainage hole is provided in the waterproof sheet, and a check valve, which is a box-shaped member as a housing and has a valve body built in, is attached to the surface side of the waterproof sheet corresponding to the drainage hole. Is.

<Problems to be solved by the device> However, in the case of No. Sho 49-20928, the drainage pipe must be buried under the water-passing member. Since relative positioning is also essential, the construction cost increases, which is disadvantageous in terms of construction period. Moreover,
Normally, on the slope covered with a waterproof sheet (for example, the slope formed on the bank of a river), the water content is higher as it goes down. There is also a problem that the water content cannot be kept small.

In the case of Japanese Utility Model Laid-Open No. 61-188625, the workability is poor because the box-shaped member needs to be positioned relative to the water drain hole when it is mounted. Further, since the box-shaped member adheres the bottom plate portion to the seat surface, it is not only misaligned at the time of bonding, but also greatly protrudes to the seat surface in the installed state, so it is easily peeled off by receiving a load from the outside and protects the check valve. Therefore, it is necessary to lay earth and sand to a thickness equivalent to that of the check valve, which is a restriction on construction.

Therefore, an object of the present invention is to provide a waterproof sheet for civil engineering work, which has good workability by effectively devising a simple drainage structure and can efficiently drain the rainwater that has penetrated to the back side of the sheet as well as the water blocking effect. is there.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention provides a waterproof sheet laid on a slope, which is arranged vertically in a contact surface state on the back surface of the waterproof sheet. The water absorbing member is provided with its upper end extending to the front surface side of the waterproof sheet and covered with a water blocking protection member except for the upper and lower end portions thereof. The gist of the present invention is that it can be discharged to the surface side of the waterproof sheet by guiding it from the lower end to the upper end due to the capillary phenomenon.

<Operation> When the waterproof sheet is laid on a slope formed on a bank such as a river, rainwater that has penetrated to the back side of the sheet is collected by the water absorbing member and rises in the water absorbing member due to a capillary phenomenon. The water is drained from the upper end portion that extends to the surface side of the waterproof sheet. Therefore, even if the water content of the bank becomes high due to heavy rain or the like, the water content of the bank on the back surface side of the seat is kept to a minimum because the water content is efficiently drained from the back surface side of the seat to the front surface side.

<Example> Hereinafter, the waterproof sheet for civil engineering work of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a main part of a waterproof sheet for civil engineering work shown as a first embodiment of the present invention, and FIG. 2 is a rear view of the sheet.

A waterproof sheet 1 as a civil engineering material shown in FIG. 1 is a waterproof layer 2 such as a vinyl chloride sheet, a buffer layer 3 such as felt integrated with the surface of the waterproof layer 2, and a back surface of the waterproof layer 2. Water absorbing member 4 and protective layer 5 as a water blocking protective member
It consists of

The water absorbing member 4 has a protective layer 5 integrated on the back surface,
It is sandwiched between the impermeable layer 2 and the protective layer 5.

As the material of the water absorbing member 4, the same felt as that of the buffer layer 3 is used, but any material that serves as a medium for sucking water from the lower part to the upper part by the capillary phenomenon may be used, for example, a civil engineering cloth such as a palm lock. Woven cloth, polyurethane foam, and woven fabric can be used. The upper end 4 of the water absorbing member 4
a extends from the upper end 2a of the water-impervious layer 2 and is folded back from the back surface side of the upper end 2a to the front surface side to sandwich the upper end 2a.

Further, as the material of the protective layer 5, the same vinyl chloride sheet as that of the water shield layer 2 is used in this embodiment, but other materials can be used as long as they are water shield. The protective layer 5 is integrated with the back surface of the water absorbing member 4 except for the upper end 5a. In this case, in order to secure the bonding strength between the both, the protective layer 5 is partially removed as shown in FIG. It is welded to the impermeable layer 2. Further, the upper end portion 5a of the protective layer 5 extends beyond the water absorbing member 4, and the upper end portion 5a is set so that it can be used as its own impermeable layer. That is, this protective layer 5
Thus, rainwater and the like are absorbed by the water absorbing member 4 only from the lower end portion 5b of the protective layer 5. Further, when the waterproof sheet 1 is in use, the water absorbing member 4 is cut off from the slope b side, and the rainwater absorbed by the lower end portion 4b of the water absorbing member 4 flows inside the water absorbing member 4 by a capillary phenomenon. It is smoothly raised from the bottom to the top.

4 and 5 show the usage state of the waterproof sheet 1, and the operation of the sheet will be described below with reference to the figures.

The slope b formed on the bank such as a river stabilizes the ground by laying the waterproof sheet 1 on the slope b and laying blocks k for articulation on the slope in order. ing. In addition, the upper end portion 4a of the water absorbing member 4
Is laid so as to be above the slope b.

Here, for example, when a large amount of rainwater permeates the bank due to heavy rain, the rainwater that enters the lower portion along the back surface direction of the waterproof sheet 1 is absorbed by the lower end portion 4b of the water absorbing member 4 as shown in FIG. It rises from the lower end portion 4b to the upper end portion 4a due to the capillary phenomenon in the absorption layer 4. Then, the rainwater that has risen from the bent end of the upper end 4a to the surface of the waterproof sheet 1 (impermeable layer 2).
Surface) and then into the river through the buffer layer 3.

This also means that when water permeates from the river bottom h to the back surface side of the waterproof sheet 1 due to the rise of the water level of the river, the water is the lower end portion 4b of the water absorbing member 4 provided on the back surface of the waterproof sheet 1 as described above. Is absorbed into the absorbent layer 4, and is discharged along the inside of the absorbent layer 4 from the bent end of the upper end portion 4a to the surface side of the waterproof sheet 1.

As described above, since the waterproof sheet 1 is provided with the water absorbing member 4, in addition to the water blocking effect, a drainage function on the slope b side can be obtained. Erosion of the bank on the back side of the sheet can be prevented.

FIG. 5 and FIG. 6 show a second embodiment of the present invention, which is an example in which the water absorbing member and the water blocking protection member are unitized as a drainage tool.

The drainage tool 14 shown in the figure has an outer cylinder 15 as a water-blocking protection member, which is formed in a flat shape with an inner hollow portion and an upper end portion 15a bent, and the water absorbing member 1 is contained in the outer cylinder 15.
6 has a built-in structure.

The water absorbing member 16 is made of a woven fabric for civil engineering such as palm lock. As shown in FIG. 6, the water blocking layer 2 and the buffer layer 3 are used.
And the upper end portion 1a of the waterproof sheet 1 or a mounting hole provided in the waterproof sheet 1. That is, the drainage tool 14 is used as needed, and an adhesive or the like is used on the back surface side of the waterproof sheet 1 with the bent upper end portion 15a of the outer tube 15 protruding toward the front surface side. And then joined. As a result, the rainwater on the back surface side of the waterproof sheet 1 rises due to the capillary action of the water absorbing member 16 covered with the outer cylinder 15 and is discharged to the front surface side of the sheet 1.

According to this configuration, even a conventional waterproof sheet can be applied as necessary depending on the geology of the slope b, and since it can be provided only in a necessary place, it is excellent in usability.

FIG. 7 shows a third embodiment of the present invention in which the drainage tool 14 is modified.

The unitized drainage tool 24 has a flat outer cylinder 25 with a hollow inside similarly to the above, and has a structure in which the water absorbing member 26 is built in the outer cylinder 25.

The outer cylinder 25 is divided into four cell portions 25a, and the water absorbing members 26 are incorporated in the respective cell portions 25a.

According to this configuration, the water absorbing member 26 has a small cell portion 25.
Since it is built in a, the capillary action of the water absorbing member 26 can be more exerted, and the drainage effect on the back surface side of the waterproof sheet 1 can be improved.

In the above process, it goes without saying that the specific shapes of the water absorbing members 4, 14 and 24 can be appropriately changed depending on the application place of the waterproof sheet 1.

<< Effects of the Invention >> As described above, the waterproof sheet for civil engineering work according to the present invention has the following effects.

In contrast to Jitsukai Sho 49-20928, it is simple because it consists of a water absorbing member and a water-blocking protection member, and it is simply placed on the back surface of the waterproof sheet, so there is no need to worry about positioning, and installation or installation workability is excellent. ing.

Also, since the water on the slope side is guided from the lower part to the upper part by utilizing the capillarity of the water absorbing member, even if the water level of the river rises and the water content of the bank becomes high due to heavy rain, etc., the water is efficiently drained. Thus, the water content of the bank on the back side of the seat can be kept to a minimum.

However, the flatness of the waterproof sheet can be easily maintained and blocks or the like can be directly and stably laid on the waterproof sheet, unlike the technique of installing a check valve on the waterproof sheet as in Japanese Utility Model Laid-Open No. 61-188625. Also, it is excellent in durability without fear of being damaged by a concentrated load from the block.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a waterproof sheet for civil engineering work shown as a first embodiment of the present invention, FIG. 2 is a partial perspective view showing a back surface of the sheet, and FIG. 3 is a schematic view showing a usage state of the sheet. Sectional view, FIG. 4 is an operational sectional view showing an enlarged portion A of FIG.
FIG. 5 is a perspective view of a main part shown as a second embodiment of the present invention, FIG. 6 is a sectional view showing the action of the water absorbing member of FIG. 5, and FIG. 7 is a view showing a third embodiment of the present invention. Partial sectional view, FIG. 8 is a schematic sectional view showing an example of use of a conventional waterproof sheet for civil engineering work, and FIG. 9 is a sectional view showing the structure of the sheet. 1 ... Waterproof sheet 4,14,24 ... Water absorption member 4a, 14a, 24a ... Upper end 5 ... Protection member 15,25 ... Outer cylinder (protection member) b ... Slope

Claims (1)

[Scope of utility model registration request] 1. A waterproof sheet laid on a slope, which is vertically arranged in contact with a back surface of the waterproof sheet and has an upper end extending to the front surface side of the waterproof sheet and having water-blocking protection. It is equipped with a water absorbing member that is covered by the members except for the upper and lower ends, and the moisture on the slope side covered with the waterproof sheet is guided from the lower end to the upper end by the capillary action of the water absorbing member, and the surface of the waterproof sheet. A tarpaulin for civil engineering works that can be discharged to the side.