JPH0444512A - Levee body coating sheet for reclamation - Google Patents

Abstract

PURPOSE:To prevent a coating sheet from damage and cleavage by extending gradually a coupling body holding the slack thereof with the weight and consolidation of reclaiming earth to extend and develop the slack gradually. CONSTITUTION:The slack 2 of a sheet material l extending lengthwise of a levee body is folded, and both ends of a coupling body 3 holding the slack are secured to the end edge 21 of the top end and the end edge 22 of the bottom side of the slack 2 to construct it to both end edges 21 and 22. The coupling body 3 is formed of belt-shaped synthetic rubber, etc., an extension rate against tension load to the direction of the bottom side is larger than that of the sheet material 1, and it is capable of extension until at least the slack 2 is completely extended and developed. A coating sheet A having such a constitution is spread over the overall slope 6 from the top end 5 of the levee body 4, and waste, 8 such as reclaiming earth, etc., is thrown into the bottom 9. At that time, the tension applied to the sheet material 1 is absorbed by the extension of the coupling toady 3 and the extension and development of the slack 2, and the damage and cleavage of the sheet material l is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used to prevent the outflow of earth and sand, water and This relates to a landfill embankment coating sheet that prevents the permeation of harmful substances.

[Conventional technology] Conventionally, in coastal reclaimed land, the earth and sand on the reclaimed side were washed away by water currents,
A covering sheet is installed from the top of the embankment to prevent it from flowing out from the embankment due to waves, and to prevent water and harmful substances from penetrating the embankment and flowing out at inland industrial waste treatment plants. Two methods are widely used: laying on the slope, or from the top to the entire bottom.

When landfill soil, waste, etc. are thrown into an embankment body with such a covering sheet, the weight of the input material and the pressure associated with consolidation cause the covering sheet laid on the embankment body to collapse in the bottom direction. When a tensile force is applied to the embankment, it may break or split, and there is an inconvenience in that earth and sand, water, harmful substances, etc. from the embankment body flow out from the damaged or split location.

Therefore, as shown in FIG. 9, for example, a plurality of loose portions 2a, 2b, and 2c, which are formed by folding the sheet material 1 and extend in the longitudinal direction of the embankment body 4, are provided, and each of the loose portions 2a is
, 2b, 2c on the top 5 side and the bottom 9 side are fixed to each other by the connecting body 3, for example, the loose parts 2a, 2b, 2
When the adhesion strength of c is increased in order from the bottom 9 side to the top 5 side and a tensile force due to the input of reclaimed earth and sand 8 etc. is applied to the sheet material 1, the bottom 9g! The connecting part 3 is cut from the loosened part 2c,
Alternatively, a covering sheet for embankment bodies has been proposed that is peeled off, released from its adhesion, and gradually spread to prevent damage and tearing of the sheet material when soil and waste are introduced (for example, Japanese Patent Publication No. 1983- (See Publication No. 30844).

[Problem to be solved by the invention] However, the loose portion 2a of the conventional sheet material l.

The fixing strengths of 2b and 2c are uniformly determined in advance in anticipation of the input of a certain amount of landfill soil 8 and the like.

Therefore, when reclaimed soil or the like is put into the landfill side, a large tensile force is applied to the sheet material 1 until the connecting body 3 is cut or peeled off due to the tensile force toward the bottom due to the reclaimed soil, etc. Not only are there concerns about opening the
When the connecting body 3 is configured to peel off, the sheet material 1 is removed at the peeling point.
Furthermore, if the loose part 2 is released and becomes tensed momentarily, there is a fear that the load will be concentrated on that part, causing damage or tearing. In addition, damage or splitting may occur, especially when the sheet material l is thin or has poor elasticity, or when protrusions of backfill gravel are located on the slope 6 near the loose parts 2a, 2b, and 2c. There is a strong possibility that this will happen.

The present invention has been developed in view of the above circumstances, and it is possible to reduce the weight and compaction of the input material by gradually expanding the loose parts formed in the covering sheet when landfill soil, waste, etc. are input. An object of the present invention is to provide a covering sheet for a landfill embankment body in which the covering sheet is not damaged or torn due to a bottomward tensile force applied to the covering sheet laid on the embankment body due to the accompanying pressure.

[Means for Solving Problem M] In the present invention, a slack portion is formed by folding the sheet material and extends in the longitudinal direction of the embankment body, and the top end side and bottom of the slack portion are provided. A configuration in which a connecting body for holding the slack portion is installed at a side end, and the connecting body can be extended at least until the slack portion is extended; The above-mentioned problem can be solved by having a configuration in which a plurality of strips are provided in the direction, and the connecting bodies provided in these loose parts are made difficult to expand in order from the loose part on the bottom side to the loose part on the top side. It was used as a means to solve the problem.

[Function] When reclaimed soil, etc. is put into the reclaimed side of the embankment on which the covering sheet has been laid, the connecting body that holds the loose part gradually expands due to the weight of the reclaimed soil, etc. and the pressure associated with consolidation. The slack portion is gradually expanded, and the effective length of the sheet material is gradually increased in accordance with the increase in the tensile force toward the bottom.

[Example] Next, embodiments of the present invention will be described in detail based on the drawings.

Note that the same components as those in the conventional example will be described with the same reference numerals.

FIG. 1 shows a first embodiment of the present invention, in which the covering sheet A is made of synthetic resin, canvas, nonwoven fabric, etc., and has a thickness of, for example, 0.
．． Loose parts 2 extending in the longitudinal direction of the embankment body of the sheet material l of about 5 to 5.0 mm are formed by folding back, and a strip-shaped connecting body 3 having approximately the same length as the width of the sheet material l holding these loose parts 2 is formed. Its both ends are fixed to the top edge 21 and bottom edge 22 of the loose part 2 by appropriate fixing means such as welding, gluing, or sewing, so that it is constructed on both edges 21 and 22. . This connecting body 3 is made of a stretchable belt-shaped synthetic rubber material, etc., and in particular, the elongation rate in the height direction of the embankment body, that is, the ratio of elongation to the tensile load in the bottom direction, is higher than that of the sheet material l. It is large and can be extended at least until the slack part 2 is fully extended.

The covering sheet A having such a structure is first laid over the entire surface of the slope 6 from the top 5 of the embankment body 4, with the loose part 2 located near the shoulder 6a of the slope 6, as shown in FIG. Then, the end edge 1a overlapping the top end 5 is fixed by being locked to the embankment body 4 by an anchor 7, and another end edge 1b is placed on the bottom 9. Then, when input material 8 such as landfill earth and sand is introduced into the bottom 9, the input material 8 accumulates and the sheet material 1 is pulled toward the bottom 9 by its weight and the pressure associated with consolidation. At this time, the stretchable connecting body 3 installed at the top edge 21 and the bottom edge 22 of the slack part 2 to hold the slack part 2 has a higher elongation rate than the sheet material 1. Therefore, the sheet material 1 is gradually expanded by the tensile force in the direction of the bottom 9, and both end edge portions 21 and 22 are separated from each other, the slack portion 2 is gradually expanded, and finally it is completely expanded (the third
Therefore, the tensile force applied to the sheet material 1 is absorbed by the elongation of the connecting body 3 and the extension of the slack portion 2, thereby preventing the sheet material 1 from being damaged or torn. Therefore, unlike the conventional method in which the loose portion is instantaneously expanded by cutting or peeling the connecting body 3, the sheet material 1 can be used with peace of mind without any fear of damage or tearing. It is also possible to use a sheet material 1 having a relatively low tensile strength, such as a small amount or a thin thickness, which is economically advantageous.

FIG. 4 shows a second embodiment of the present invention, in which the sheet material 1 has a plurality of loose parts 2a, 2b, in the height direction of the embankment body.
2c are provided in order, and the loose portions 2a, 2b, 2 are provided at the top edge and bottom edge of each of the loose portions 2a, 2b, 2c.
A connecting body 3a similar to the first embodiment described above that holds c.

3b and 3c are constructed. In addition, the connecting body 3a,
3b.

3c has a different elongation rate so that the elongation rate decreases in order from the slack part 2c on the bottom 9 side to the slack part 2a on the top 5 side. Almost the same as the embodiment, as the input material 8 is added, the connecting bodies 3a and 3b are connected in order from the bottom loose part 2c.
, 3c are stretched to extend the slack portions 2a, 2b, 2c. Therefore, by forming a plurality of loose portions 2a, 2b, 2c, the extendable length of the sheet material 1 can be made sufficiently long, and the loose portions 2a, 2b can be made sufficiently long.
, 2c can be reliably spread with the input of the input material 8, and even if a large tensile force is applied to the sheet material 1, it can be reliably absorbed to prevent damage and tearing.

In this embodiment, three slack portions 2a, 2b, and 2c are formed, but the number does not matter as long as a plurality of slack portions are formed.

FIG. 5 shows a third embodiment of the present invention, in which a plurality of loose portions 2a, 2b, 2c are provided in order in the height direction of the embankment body in the sheet material l, as in the second embodiment. A strip-shaped connecting body 3a formed of a stretchable synthetic rubber material or the like that holds the loose parts 2a, 2b, 2c at the top edge and the JI side edge of the loose parts 2a, 2b, 2c, 3b and 3c are constructed,
In this embodiment, unlike the second embodiment, each connecting body 3a, 3
b and 3c have the same elongation rate, and the number of these is changed for each of the slack parts 2a, 2b, and 2c, and they are extended in order from the bottom slack part 2C. Therefore, there is an advantage that the connecting bodies 3a, 3b, and 3c can be formed from the same material.

FIG. 6 shows a fourth embodiment of the present invention, in which a plurality of loose portions 2 are provided in the sheet material l in the direction of the height of the embankment, similar to the first embodiment, and the tops of these loose portions 2 are End edge 21
In this configuration, a connecting body 3 having elasticity that holds the loose part 2 is installed on the bottom edge 22.
A pair of metal, such as iron, or hard synthetic resin, facing each other, are penetrated and supported by a plurality of loop-shaped fastening members 31 arranged in parallel on the top edge 21 and the bottom edge 22. The method of use, operation, and effects of this embodiment are almost the same as those of the first embodiment, except that it is composed of a coil spring that can be extended until at least the slack part 2 is completely covered with electricity, and is installed on the rod 32.32. However, the advantage is that it is easy to install the connecting body 3, and the spring load can be appropriately selected at the site according to the condition of the slope where the installation is being carried out, the type of material to be thrown, etc. have.

Also, in this embodiment, as in the second and third embodiments shown in FIG. 2.3, there are a plurality of loose parts 2a, 2b, 2.
c, and connecting bodies 3 are installed on each of the loose parts. In this case, connecting bodies 3 with different spring loads can be used, or connecting bodies 3 with the same spring load can be installed on each slack part. By erecting different numbers of parts 2a, 2b, and 2c, it is possible to extend them in order from the loose part 2c on the bottom side to the loose part 2a on the top side.

FIG. 7 shows a fifth embodiment of the present invention, and the overall configuration is the same as that of the first embodiment, except that the connecting body 3 installed on both edges 21 and 22 of slack #2 is A strip piece made of the same material as sheet material 1 and having almost the same length as the slack part is bent into a bellows shape in the direction of the height of the embankment body, and the mutually opposing folded surfaces are bonded using, for example, hot melt adhesive. Formed into a layer by thermal bonding with an agent 33 interposed,
Furthermore, the adhesive strength is gradually decreased from the bottom layer. Therefore, when a tensile load is applied to the sheet material 1 by the input material, as shown in FIG. 8, the adhesive between the folded surfaces is sequentially peeled off from the bottom layer, and the connecting body 3 intermittently expands.
Accordingly, the slack portion 2 gradually expands, and the effective length of the sheet material 1 gradually increases and elongates.

Unlike the previous embodiments, this embodiment has the advantage that the sheet material 1 can be used as is as the connecting body 3.

In each of the above embodiments, the connecting bodies 3, 3a, 3b, 3c are connected to both ends 21, 22 of the loose parts 2, 2a, 2b, 2c.
Although the construction was made such that it is constructed at the edges, it is not necessary to erect it at the edges, but it may be at the ends of the slack parts 2, 2a, 2b, and 2c.

[Effects of the Invention] According to the present invention having the above-described configuration, when landfill soil, waste, etc. are put in, the slack portion formed by folding the sheet material gradually expands, and the weight and weight of the landfill soil, etc. It is capable of absorbing the increase in tensile force toward the bottom due to pressure associated with compaction and reliably preventing breakage and tearing.

Since the tensile force in the bottom direction applied to the covering sheet laid on the embankment body is efficiently released, there is no fear that the covering sheet will be damaged or torn when the loose part is extended.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a perspective partial view, FIGS. 2 and 3 are explanatory diagrams showing the state of use, and FIG. 4 is a diagram showing the present invention. FIG. 5 is a perspective partial view showing a third embodiment of the present invention, FIG. 6 is a perspective partial view showing a fourth embodiment of the present invention,
7 and 8 are perspective partial views showing a fifth embodiment of the present invention, and FIG. 9 is an explanatory view of a conventional example in a state of use. 1... Sheet material, 2, 2a, 2b, 2c
m loose part, 3, 3a, 3b, 3cm connection body,
4... Bank body, 5... Top, 9... Bottom, A... Covering sheet. Figure 1 Figure 6

Claims (1)

[Claims] 1. A loose portion is provided in the sheet material by folding and extends in the longitudinal direction of the embankment body, and the loose portion is held at the top end and bottom end of the loosened portion. 1. A reclamation embankment body covering sheet, characterized in that a connecting body is constructed, and the connecting body can be stretched at least until the slack portion is extended. 2. A plurality of loose parts are provided in the height direction of the embankment body, and the connecting bodies provided in these loose parts are arranged in order from the loose part on the bottom side to the loose part on the top side. The landfill embankment covering sheet according to claim 1, which is made difficult to stretch.