JP2854536B2 - Embankment slope formation method and embankment slope formation unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an embankment slope which is low in cost and easy to form a slope, and in which an L-shaped net member is hardly deformed by embankment pressure, and an embankment slope formation used therefor. For the unit.

[0002]

2. Description of the Related Art Conventionally, as a method for forming an embankment slope using a unit for forming an embankment slope, there is known a method described in, for example, Japanese Patent Application Laid-Open No. 3-230321 filed by the present applicant. I have. In this method, an embankment reinforcing sheet is laid on a soil surface by partially extending from an edge on a slope side thereof, and a metal L-shaped net member is formed on a slope formation portion of the soil surface, and an upper portion thereof is formed. Was placed toward the slope side of the soil surface, earth and sand were poured into the L-shaped net member from above the embankment reinforcing sheet, and the embankment was embanked, and then extended from the edge of the embankment reinforcing sheet on the slope side. The portion is rolled up to cover the upper surface of the embankment layer, and these operations are sequentially repeated to form an embankment slope having a desired height. The upper side of the L-shaped net member has an upper part,
A triangular reinforcing structure consisting of a part of the lower part and a connecting part on the back side is provided.

[0003]

However, since the extending portion of the embankment reinforcing sheet is long and the L-shaped net member has a triangular reinforcing structure, the weight increases,
The cost increases, and on the slope, a relatively laborious operation of folding the extension of the embankment reinforcing sheet to the embankment upper surface must be performed.

[0004] Therefore, the triangular reinforcement of the L-shaped net member is stopped and, for example, as disclosed in Japanese Patent Publication No. 63-11488,
It is also possible to reinforce several hook-shaped beam members by hanging them at predetermined intervals between the ends of the upper and lower sides of the V-shaped net member, and also remove the extension of the embankment reinforcing sheet. Conceivable. However, the beam member alone does not sufficiently reinforce the upper portion of the L-shaped net member which is directly subjected to a large pressure from the embankment side. There is a problem that the net member is pressed and bent. In addition, the folded back of the extending portion of the embankment reinforcing sheet to the upper surface of the embankment also played a role in preventing the deformation of the L-shaped net member, but without it, the upper portion of the L-shaped net member is further easily deformed. Problem arises.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been made in consideration of an embankment method in which an L-shaped net member is not easily deformed by embankment pressure at a low cost and is easy to form a slope. It is an object of the present invention to provide a surface forming method and an embankment slope forming unit used for the method.

[0006]

According to a first aspect of the present invention, there is provided a method for forming an embankment slope, the step of laying an embankment reinforcing sheet on the soil surface, and the step of forming a metal L on the slope formation portion of the earth surface. A step of connecting the embankment reinforcing sheet with the upper portion of the L-shaped net member facing the slope side of the soil surface, and a metal reinforcing cap on the upper edge of the upper portion of the L-shaped net member. A mounting step and a step of charging earth and sand from above the embankment reinforcing sheet inside the L-shaped net member, and repeating these steps to form an embankment slope of a desired height. I have.

The embankment slope forming unit according to claim 2 includes a metal L-shaped net member and a metal reinforcing cap mounted on an upper edge of an upper portion of the L-shaped net member. I am preparing for it.

[0008] In addition, prior Symbol reinforcing cap, the upper edge portion of the upper portion of the L-shaped network member can be mounted, the inner plate, the cross section U consisting of an upper plate which connects the outer plates and Ryoita shaped cap The inner plate is longer than the outer plate, and has a shape in which a front end portion is bent outward and has a rib for reinforcement.

[0009]

According to the first aspect of the present invention, there is provided a method for forming an embankment slope and a second aspect.
In 2 SL placing embankment slopes forming unit, such as embankments reinforcing sheet laid in the soil surface, then on a slope forming portion of the soil surface, a metal L-shaped network member, soil surface the upper portion It is arranged toward the slope side and connected with the embankment reinforcing sheet, and then a metal reinforcing cap is attached to the upper edge of the upper part of the L-shaped net member, and then the embankment is reinforced inside the L-shaped net member. Earth and sand are charged from above the sheet, and the above steps are repeated to form an embankment slope having a desired height. At this time, since the reinforcing cap is attached to the upper edge of the upper portion of the L-shaped net member arranged on the slope forming portion of the soil surface, after embankment, the upper edge of the L-shaped net member is Even when a large embankment pressure is applied from the inside, the reinforcing cap firmly reinforces the upper edge portion to which a large deformation pressure is applied, and prevents the deformation.

[0010] In particular, in the embankment slope forming unit according to the second aspect, the reinforcing cap is a cap having a U-shaped cross section, and the inner plate is longer than the outer plate, and the tip portion is outward. Since it has a shape that is robust against the bending force that has become a bent reinforcing rib, the upper part of the L-shaped net member has
The upper part does not deform even when a higher embankment pressure is applied.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. First, with reference to FIGS. 1 and 2, a structure of a bank slope forming unit 10 (hereinafter, a bank slope forming unit is referred to as a “unit”) constituting a bank slope forming wall material will be described. The unit 10 includes an L-shaped net member 20 composed of an upper portion 20a and a lower portion 20b obtained by bending a metal net member substantially at an intermediate portion, and both ends of a tip portion of the upper portion 20a and tips of the lower portion 20b. The beam member 30 is hung on both sides of the L-shaped net member 20, and a metal reinforcing cap 40 mounted on the upper edge of the upper portion 20a of the L-shaped net member 20 is provided.

As the L-shaped net member 20, an expanded metal which is relatively light and has a large strength is used, but a mesh-shaped welded net can also be used. L
The surface of the character-shaped net member 20 may be coated with a plating process such as zinc plating or a plastic coating such as polyethylene coating in order to prevent deterioration due to rust or corrosion.

The size of the unit 10 varies depending on the construction purpose and construction scale.
20-120mm, height 200-upper part 20a
1,000 mm (500 mm in this example), width 1,
It is preferably from 2,000 to 2,500 mm (here, 1,200 mm). In addition, the upper and lower side portions 20a which become the slope angle of the slope,
The bending angle of 20b is preferably 60 to 90 degrees in order to facilitate the introduction of earth and sand into the back side of the upper portion 20a.

The beam member 30 has upper and lower side portions 20 at its tip.
a, a steel bar-shaped member formed with a hook 30a for hooking to a and 20b. The thickness is preferably 6 to 20 mm.
As shown in FIG. 3, the reinforcing cap 40 is attached to the upper edge of the upper portion 20a of the L-shaped net member 20, and is connected to the inner plate 41, the outer plate 42, and the upper plate 40 for connecting the two plates 41, 42. 43 is a cap having a U-shaped cross section.
Is longer than the outer plate 42 and has a distal end bent at a right angle outward to form a reinforcing rib 44.

As the material of the reinforcing cap 40, a metal base such as a pentite coil plated with zinc or the like can be used, and the length thereof is 1,000 in accordance with the length of the L-shaped net member 20. 2,000 mm (here, 1,200 mm), and the plate thickness is preferably 1.2-3.6 mm. The length of the inner plate 41 is 30 to 100 mm (here, 45 mm), the length of the outer plate 42 is 10 to 60 mm (here, 15 mm), the length of the upper plate 43 is 10 to 20 mm (here, 15 mm), The length is 5 to 30 mm (here, 15 mm).

In addition to the unit 10, an embankment reinforcing sheet 50 laid on the earth surface G is used in the embankment slope forming method of the present invention. As the embankment reinforcing sheet 50, a resin net for civil works described in Japanese Utility Model Publication No. 6-29210 previously filed by the present applicant can be used.
However, without being limited to this, other geotextiles (fiber-reinforced resin net, stretched resin net,
Hardened mesh woven or knitted fabric, ordinary woven or knitted fabric,
Nonwoven fabric) may be used.

As shown in FIG. 4, the resin net for civil engineering is formed by extruding a synthetic resin, for example, high-density polyethylene from a fine hole by an extruder and molding the resin, preferably several mm to several tens cm. Is a net made up of a meridian 51 and a latitude line 52 having a scale of 6 to 15 cm and having a strength of 4 tons or more per 1 m in the width direction when the net is elongated by 5%.

A filament core 53 made of a kind of wholly aromatic polyamide fiber, aramid fiber, is embedded in the meridian wire 51 for reinforcing the strength. In addition, the core material 53 may be a general-purpose resin such as low-density polyethylene, polypropylene, nylon, polyester or polyvinyl chloride, an ultra-high-molecular-weight polyethylene fiber, carbon fiber, steel fiber, or a high-tensile material such as glass fiber or inorganic fiber. May be used. The thickness of the meridian 51 and the latitude line 52 is preferably 1 to 15 mm, and the thickness of the core material 53 is preferably 100 to 90,000 denier.

As shown in FIG. 5, a general-purpose size of the embankment reinforcing sheet 50 is a sheet having a length of about 30 m in the direction of the meridian 51 and about 1.2 m in the direction of the latitude 52, At the time of laying, the end portions of the adjacent embankment reinforcing sheets 50 are overlapped with each other, and the spiral connecting member 54 is inserted from one side of the overlapping portion along the stitch of the net, and the spiral projecting from the other side of the overlapping portion. The connecting member 56 is connected to the inside of the connecting member 54 by connecting a connecting rigid bar 55 in a series.

As the spiral connecting member 54, for example, a steel wire such as a piano wire or a synthetic resin such as polyethylene, polypropylene, polyvinyl chloride, nylon and polystyrene can be used. The thickness is preferably 1 to 9 mm. As the connecting rigid bar 55, for example, a steel wire such as a piano wire or a synthetic resin such as polyethylene, polypropylene, or polyvinyl chloride can be used. The thickness is preferably 1 to 9 mm.

Next, an embankment slope forming method using the embankment slope forming unit 10 according to the embodiment of the present invention will be described. First, as shown in FIG. 6, an embankment reinforcing sheet 50 is laid on the soil surface G while being connected using a connecting means 56 including a spiral connecting member 54 and a connecting rigid bar 55. At this time, each embankment reinforcing sheet 50 is connected such that the connecting portion is perpendicular to the slope.

Next, an L-shaped mesh member 2 having left and right ends reinforced by beam members 30 on the slope forming portion of the soil surface G.
0 is arranged so that its upper part 20a is parallel to the slope side of the earth surface G. At this time, the lower side portion 20b of the L-shaped net member 20 and the slope side of the laid embankment reinforcing sheet 50 have the connecting portion parallel to the slope surface, and the spiral connecting member 54 and the rigidity for connection. It is connected by connecting means 56 composed of a rod 55.
Thereafter, the reinforcing cap 40 is attached to the upper edge of the upper portion 20a of the L-shaped net member 20. The reinforcing caps 40 may be mounted on the respective L-shaped net members 20 or may be mounted between adjacent L-shaped net members 20 in a bridging state. In the latter mounting method, the connection between the adjacent L-shaped net members 20 becomes firm.

Subsequently, earth and sand are poured into the L-shaped net member 20 from above the embankment reinforcing sheet 50 to form the embankment 60. The above steps are repeated twice and further as shown in FIG. 7 to form an embankment slope. As described above, since the reinforcing cap 40 is attached to the upper edge of the upper portion 20a of the L-shaped net member 20, even if a large pressure is applied to the upper portion 20a from the inside by the embankment, the reinforcing cap 40 is attached. However, since the upper edge portion 20a, which is easy to bend, is reinforced firmly, its deformation can be prevented.
Further, the reinforcing cap 40 is a cap having a U-shaped cross section, and the inner plate 41 is longer than the outer plate 42, and the outer plate 4
2 has a rib 44 bent outwardly, so that it has a shape that is robust against bending force, and a larger embankment pressure is applied to the upper portion 20 a of the L-shaped net member 20. However, the upper portion 20a is not deformed.

As shown in FIG. 8, the L-shaped net member 2
By reinforcing a steel reinforcing rod 70 from the outside on the hook 30a on the upper side of the beam member 30 hooked on the upper part 20a of the "0", it is possible to further reinforce the reinforcement. The reinforcing rod 70 has a length of 500 to 2,500 m (here, 1,
200mm), thickness 12-22mm (19m here)
m) are preferred.

Here, the experimental results when an embankment slope formation experiment was actually performed will be described with reference to the graph of FIG. The horizontal axis of the graph indicates the displacement length, the vertical axis indicates the height position of the upper portion 20a of the L-shaped net member 20, and the line GL indicates the earth surface G. Group A includes the reinforcing cap 40 and the reinforcing rod 7.
0, the unit 10 with the beam member 30 is used, and the group B is the beam member 3 without the reinforcing rod 70.
0 and an example using the unit 10 with the reinforcing cap 40, and the C group shows an example using the unit 10 with the beam member 30, the reinforcing cap 40, and the reinforcing rod 70, respectively. In addition, the embankment pressure is 80 kg for line a.
In the case of f, the b line shows a case of 160 kgf, and the c line shows a case of 240 kgf. As is clear from this graph, the strength of the group B using the reinforcing cap 40 is remarkably higher than that of the group A, and the strength of the group C using the reinforcing rod 70 is further smaller than that of the group B, and the strength is higher. It turned out to be.

Although the embodiments of the present invention have been described above, the specific structure and operation are not limited to those embodiments, and even if there is a design change without departing from the gist of the present invention. Included in the present invention. For example, each step of the embankment slope forming work in the embodiment is performed by, for example, the L-shaped net member 2.
0 are arranged on the soil surface G, the embankment reinforcing sheet 50 is laid, and the L-shaped net member 20 with the reinforcing cap 40 inserted is arranged on the earth surface G. Included in the invention.

The L-shaped net member 20, the reinforcing cap 4
The material, shape, etc. of the embankment reinforcing sheet 50 and the reinforcing rod 70 are not limited to those of the embodiment, and may be any. Further, the beam member 30 does not need to be provided in all units due to the reinforcing effect of the reinforcing cap 40. Further, the connecting means 56 between the embankment reinforcing sheets does not need to use the spiral connecting member described in the embodiment, and may have any other connecting structure.

Further, for example, a vegetation sheet for greening the slope may be provided in advance on the inner surface of the upper portion 20a of the L-shaped net member 20 constituting the embankment slope slope forming unit 20. The vegetation sheet may be partially attached to the inner surface of the wall material each time before the embankment work. In addition, when the vegetation sheet is attached, the upper end of the vegetation sheet is covered with the upper edge of the upper part of the L-shaped net member, and is fixed with the reinforcing cap 40, so that the vegetation sheet can be fixed easily and securely.

[0029]

As described above, according to the present invention, in claim 1 Fill slopes forming method and claim 2 fill method surface forming units used therein described according is configured as described above, also the fill method Since the surface forming method is performed in accordance with the above-described procedure, an effect is obtained that the cost is low, the slope is easily formed, and the L-shaped net member is hardly deformed by the embankment pressure.

[0030] In particular, Sheng soil slopes forming unit according to claim 2, wherein, as the reinforcing cap, the whole shape has a shape of cross-section U, a long than the inner plate outer plate, yet the outer tip portion Since it adopts a rib that is bent to the direction of reinforcement, it is robust against bending force, and even if a larger embankment pressure is applied to the upper part of the L-shaped net member, this upper side deforms Can be prevented.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of an embankment slope forming unit according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a usage state of the embankment slope forming unit of the embodiment.

FIG. 3 is an enlarged sectional view of a mounting portion of a reinforcing cap.

FIG. 4 is a partially enlarged plan view of the embankment reinforcing sheet.

FIG. 5 is a partially enlarged perspective view of a connecting portion of the embankment reinforcing sheet.

FIG. 6 is an explanatory view showing a method for forming an embankment slope according to one embodiment of the present invention.

FIG. 7 is an explanatory view showing a method of forming an embankment slope according to one embodiment of the present invention.

FIG. 8 is a partially enlarged sectional view showing an embankment slope forming unit according to another embodiment.

FIG. 9 is a graph showing a degree of deformation of an upper portion of an L-shaped net member using various embankment slope forming units.

[Explanation of symbols]

 Reference Signs List 10 embankment slope forming unit 20 L-shaped net member 20a upper part 20b lower part 40 reinforcing cap 50 embankment reinforcing sheet G earth surface

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-3797 (JP, A) JP-A-7-119153 (JP, A) JP-A-4-108914 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) E02D 17/18 E02D 17/20 103

Claims (2)

(57) [Claims] 1. A step of laying an embankment reinforcing sheet on a soil surface, and placing a metal L-shaped net member on a slope forming portion of the soil surface with an upper portion thereof facing the slope surface of the soil surface. Laying and connecting to an embankment reinforcing sheet, attaching a metal reinforcing cap to the upper edge of the upper part of the L-shaped net member, and embedding the embankment reinforcing sheet inside the L-shaped net member And a step of charging earth and sand from above to form an embankment slope having a desired height by repeating these steps. 2. An L-shaped net member made of metal, and a metal reinforcing cap mounted on an upper edge portion of an upper portion of the L-shaped net member, wherein the reinforcing cap is provided with the L-shaped net member.
Inner plate, outer plate, and upper plate that can be attached to the upper edge of the upper
U-shaped cap consisting of an upper plate connecting the two plates
And the inner plate is longer than the outer plate and
An embankment slope forming unit, wherein an end is bent outward to form a reinforcing rib .