JPS6332180Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a belt-type rubber bag body that can be used for oil fences, rubber dams, floating fish cages, and the like.

As a conventional rubber bag of this type, there is one shown in FIG. 1, for example.

This is because a non-adhesive zone 2 is provided in the widthwise center of the belt-shaped rubber sheet 1, and this non-adhesive zone 2 is
A reinforcing canvas 3 surrounding the is embedded in the band-shaped rubber sheet 1,
Furthermore, if necessary, outer reinforcing canvas 4, 4 is buried in parallel near the surface of the belt-shaped rubber sheet 1 in the thickness direction. By supplying , the non-adhesive zone portion is expanded as shown in FIG. 2 and functions as a rubber dam, oil fence, etc.

However, when using such a conventional rubber bag body, the boundary between the inflatable part and the non-inflatable part, in other words, the part corresponding to the end part of the non-adhesive zone 2 on the outside of the reinforcing canvas (see FIG. (See part A)
As stress concentrates and cracks occur there, the filling fluid flows into the non-bonded zone 2 from the cracks that originate from the edge of the non-bonded zone 2 and reach the reinforcing canvas 3 as shown in FIG. leaks into the crack through the reinforced canvas 3,
This increases the cracks and causes the reinforcing canvas 3 to peel off or puncture at the increased cracks, resulting in a problem of lowering the durability of the rubber bag.

This invention advantageously solves this problem of the prior art, and in particular, at least corresponds to the end portion of the non-bonded zone on the outside of the reinforcing canvas, which is the part where stress is most likely to be concentrated when the non-bonded zone expands. By providing slits along the reinforcing canvas in advance in the sections, stress concentration is prevented and cracks are prevented, and the expansion resistance of the non-adhesive zone is reduced, and the slits are communicated with the atmosphere. The object of the present invention is to provide a rubber bag body which effectively prevents the increase in cracks and punctures that occur in the prior art and improves the durability of the bag body.

This invention will be explained below based on the drawings.

FIG. 3 is a cross-sectional view in the width direction showing an embodiment of this invention. In the figure, 11 is a band-shaped rubber sheet, and 12 is a slit-shaped slit provided at the center of the band-shaped rubber sheet in the width direction, and continuous in the length direction. Shows non-adhesive zone.

Here, this non-adhesive zone 12 is surrounded in the width direction by a reinforcing canvas 13 embedded in the band-shaped rubber sheet 11, and if necessary, the band-shaped rubber sheet 11 is
In the vicinity of the surface in the thickness direction, the outer covering reinforced canvas 14,1
4 are buried in parallel.

Therefore, the reinforcing canvas 13 has a curved portion 13a having an arcuate cross section at a position corresponding to the end portion of the non-adhesive zone 12, and a flat portion 13a having a linear cross section at a position corresponding to the middle portion of the non-adhesive zone 12. Part 13b
have each.

Further, on the outside of the reinforced canvas 13, a reinforced canvas 1
A slit 15 extending in the length direction of the belt-shaped rubber sheet 11 is provided along the length of the belt-shaped rubber sheet 11, and the slit 15 is formed into a communicating hole opening in a flat surface portion of the belt-shaped rubber sheet 11, as shown in a partially cross-sectional perspective view in FIG. 16 or at least one of the communication holes 17 opened on the side end surfaces thereof.

Therefore, when the non-bonded zone 12 is filled with fluid to expand that part, stress concentration at the boundary between the expanded part and the non-expanded part is eliminated, and the occurrence of cracks is effectively prevented, as well as other aspects. , the expansion resistance of the inflatable portion is reduced, resulting in the benefit of requiring less fluid filling power. Moreover, in the expanded state shown in FIG. 4, the non-adhesive zone 1
Even if the crack that occurs at the edge of 2 reaches the reinforcing canvas 13 as shown in FIG. 5, and the filling fluid leaks from there through the reinforcing canvas 13 to the slit 15,
Since all of the leaked fluid is led out into the atmosphere through at least the communication hole 16 or 17, there is no risk of swelling or puncture of the band-shaped rubber sheet portion.
The durability of the rubber bag body is significantly improved.

Note that the distance of the slit 15 from the outer circumferential surface of the reinforcing canvas is determined based on the allowable amount of fluid leakage, the allowable internal stress, and the allowable length of the rubber material that is damaged when the filling fluid reaches the slit 15 from the non-adhesive zone 12. It can be selected as appropriate by taking into consideration the following. However, if the distance is too long, the substantial benefit of providing the slit 15 cannot be obtained.

In addition, the length of the slit 15 around the reinforced canvas is
It is preferable that the length is at least enough to effectively prevent the occurrence of cracks, in other words, the length corresponds to the end portion of the non-bonded zone on the outside of the reinforced canvas. Therefore, the slit 15 can also surround the reinforcing canvas 13.

As described above, according to this invention, leakage fluid from the non-bonded zone can be led out to the atmosphere through the slit and the communication hole connected to it, which prevents the occurrence of cracks in the rubber material. Not only can the strength of the bag be sufficiently prevented from decreasing due to the increase in size, but also the durability of the bag can be increased by effectively preventing local bulges and punctures of the band-shaped rubber sheet and peeling of the reinforcing canvas.

[Brief explanation of the drawing]

1 and 2 are sectional views showing a conventional example, FIG. 3 is a sectional view showing an embodiment of this invention, FIG. 4 is a partially sectional perspective view showing a rubber bag according to this invention, and FIG. 5 FIG. 2 is a cross-sectional view of the rubber bag showing the non-adhesive zone in an inflated state. 11... Belt-shaped rubber sheet, 12... Non-adhesive zone, 13... Reinforced canvas, 14... Outer cover reinforced canvas,
15...Slit, 16,17...Communication hole.

Claims (1)

[Scope of utility model registration request] A belt comprising a band-shaped rubber sheet, a non-adhesive zone provided at the center of the band-shaped rubber sheet in the width direction and to which fluid is supplied and discharged, and a reinforcing canvas embedded in the band-shaped rubber sheet surrounding the non-adhesive zone. type of rubber bag body, characterized in that a slit is provided along the reinforcing canvas at least in a portion corresponding to the end portion of the non-adhesive zone on the outside of the reinforcing canvas, and the slit is communicated with the atmosphere. Type of rubber bag body.