JP6049211B2 - Slope protection method - Google Patents

Description

  The present invention relates to a slope protection method for preventing slope collapse and topsoil outflow.

  As a conventional slope protection method, after shaping the slope, an anchor hole is drilled and an anchor is inserted, and the anchor hole is filled with an amount of mortar that exposes the head of the anchor. Laying on the slope, placing a presser plate on the surface of the protective net, fixing it to the exposed anchor head, and pressing the protective net against the slope to prevent collapse and outflow of topsoil (See, for example, Patent Document 1).

  By the way, in the above technique, after shaping the slope, a protective net cannot be laid until the excavation of the anchor hole and the hardening of the filled mortar is completed, so that the slope after shaping is not temporarily collapsed during construction. Measures were necessary, and construction period and construction cost were required. In addition, when shaping a collapsed slope, depending on the soil quality, slope of slope, etc., the embankment alone may be insufficient in strength.

JP 2007-39974 A

  The problem to be solved by the present invention is to solve these conventional problems and to reinforce, protect, and green the slope in a shorter construction period and at a lower cost compared to the prior art.

The configuration of the present invention that solves this problem is as follows.
1) Shaping the slope to be protected with earth or sand or sandbag, laying a protection net with a vegetation mat with seeds on the surface of the earth or sand or sandbag, penetrating the anchor through the protection net, and the ground of the slope Drive to the depth to reach the mountain, place the presser rebar vertically or sideways on the surface of the installed protective net, and attach a fastener with a hook to the head of the anchor that has already been installed. Slope protection method 2) Fixing the hook to the presser bar and fixing the protective net and the vegetation mat to the surface of the sand or sandbag. The fixing tool bent the round steel into a U shape and formed a hook. The steel pipe is welded to the side of the hook side-by-side, and the anchor is made of a deformed bar steel bar that can be screwed onto the nut, and the steel pipe of the fixture is passed through the head of the anchor. Engage the hook with the rebar 1), wherein the nut is screwed onto the head of the anchor and the fixing tool is tightened, and the presser bar is pressed against the protective net so that the protective net and the vegetation mat follow the surface shape of the earth or sand or sandbag. The slope protection method 3) The above 1) or 2), wherein the surface of the sand or sandbag has irregularities, and the presser rebar is bent along the irregularities and arranged on the surface of the protective net. Slope protection method 4) In the slope protection method according to any one of 1) to 3), the presser bar is covered with a protection pipe.

  According to the configuration described in the above 1) of the present invention, since the anchor is directly driven on the natural ground, the time required for excavation of the anchor hole and the time required for hardening of the mortar as in the past are omitted, Immediately after shaping the slope, a cut-off surface is protected early by laying a protective net. Therefore, a temporary measure for preventing collapse or the like during construction is unnecessary, and the slope can be protected and greened in a shorter construction period and at a lower cost than the conventional technology. In addition, the method of retaining the slope with sandbags can simultaneously reinforce the slope where strength is insufficient only by embankment.

  According to the configuration described in 2) of the present invention, the protective net can be fixed to the slope with an easy operation, and the fixture can be manufactured with a simple structure and at a low cost. In addition, the slope can be protected at a low cost.

  According to the configuration described in the above 3) of the present invention, the protective net can be brought into close contact with the surface of the protective net and the surface of the sand or sandbag so that the protective net is disturbed by strong winds, It can be securely fixed and stabilized so that the sandbag does not move.

  According to the configuration described in the above 4) of the present invention, unlike the anchor embedded in the ground, the presser bar is arranged on the ground surface and is always exposed to the outside air and rainwater. To improve and maintain quality for a long time.

It is sectional drawing which shows the state after construction of an Example. It is explanatory drawing which shows the process of an Example. It is explanatory drawing which shows the process of an Example. It is a partially cutaway sectional view showing the state of the fixture after construction of the example. It is a top view which shows the slope after the construction of an Example. It is a partially cutaway sectional view showing the state of the fixture after construction in another example of the embodiment.

  The protective net of the present invention is for covering a shaped slope to prevent collapse, erosion, topsoil outflow, etc., and to allow plants to vegetate. This protective net includes a reinforcing net made of synthetic resin fibers such as polyester and polypropylene, and seeds in a non-woven fabric (with a fertilizer bag containing a slow-release chemical fertilizer if necessary) Use the laminated vegetation net. As dimensions, a width of 80 to 100 cm and a roll length of 20 to 30 m are common. In the construction, rolls are rolled up in a vertical direction, and the plurality of sheets are laid side by side.

  The anchor is for fixing the laid protective net on the slope. As this anchor, a threaded steel bar that can be screwed with a nut is used, and it is desirable that the surface is galvanized and rust-proof to prevent corrosion. As dimensions, the outer diameter is generally 19 to 25 mm, and the length is generally 2 to 5 m. For the construction, a dedicated driving machine is lifted by a small mobile crane, and the anchor is vibrated while being driven at right angles to the slope of the slope and so that the head does not protrude greatly from the ground surface. In places where mobile cranes cannot enter, use a small manpowered driving machine.

  The presser bar is for pressing the installed protective net along the shape of the slope. As the presser reinforcing bar, a threaded bar steel bar that can be screwed with a connecting coupler is used, and it is desirable that the surface is galvanized and rust-prevented to prevent corrosion. Further, unlike the anchors buried in the ground, they are arranged on the ground surface and are always exposed to the outside air and rain water. Therefore, the weather resistance is preferably enhanced by covering with a protective pipe made of synthetic resin such as polyethylene. As the dimensions, the outer diameter is generally 16 to 25 mm, the length is set to 5 m at the maximum, and the longer length makes installation work difficult. In the construction, a plurality of pieces are arranged in parallel in the vertical direction or the horizontal direction, or arranged in a lattice shape. If the surface shape of earth or sand or sandbag has irregularities, bend it according to the irregularities.

  The fixing tool is for pressing the arranged presser reinforcing bars against the upper surface of the protective net. As this fixture, round steel is bent into a U-shape to form a hook, and steel pipes are welded to the sides of the hook. The surface is galvanized to prevent corrosion and rust is prevented. The processed one is desirable. Further, two hooks may be welded to both side surfaces of the steel pipe so that the two presser rebars can be pressed simultaneously with a single fixing tool. As for dimensions, round steel has a length of about 30 cm, and steel pipe has an inner diameter into which an anchor can be inserted, and the length is generally 5 to 10 cm. The construction is carried out by covering the head of the anchor that has been cast from the upper surface of the protective net and screwing the nut onto the head of the anchor protruding from the fixture. The fixing tool is covered with a plastic cap such as vinyl chloride resin in order to prevent detachment, and a solidifying material such as mortar is filled inside and solidified.

  Sediment is used when shaping a collapsed slope or a slope that tends to collapse into a predetermined shape. As this earth and sand, earth, natural stone having a particle size of about 5 to 50 cm, crushed stone, or the like is used. In addition to the method of embedding directly along the slope, the construction includes a method of stacking sandbags. For the sandbag, use is made of a cube of about 1.0 m obtained by compacting a material in which soil and crushed stone are mixed, or natural stone or crushed stone accommodated in a net bag. As the net bag, a fiber woven from synthetic resin fibers such as polyester and polypropylene is used.

  In addition, there is a fixing pin that is used as an auxiliary when necessary when fixing a laid protective net on the slope. As the fixing pin, a round steel head is bent into a U shape to form a hook, and the surface is hot dip galvanized and rust-proofed. As dimensions, the outer diameter is generally 10 to 15 mm, and the length is generally 400 to 600 mm. In the construction, the protective net is penetrated and directly placed on the ground, and the hook is locked to the mesh of the protective net.

  In addition, a portion near the ground surface of the anchor that has been placed may be protected by a protection pipe to prevent corrosion. As this protective pipe, plastic such as vinyl chloride resin is used. The dimensions are generally the inner diameter into which the anchor can be inserted, and the length is generally 400 to 600 mm. The construction will be press-fitted into the natural ground after the anchor is placed.

  Embodiments of the present invention will be specifically described below with reference to the drawings. In addition, this invention is not limited to a following example, Various combinations and deformation | transformation are possible.

  The slope protection method of the present embodiment is shown in FIGS. In the figure, 1 is a protective net, 2 is an anchor, 3 is a reinforcing bar, 4 is a fixture, 5 is a protective pipe, 6 is a sandbag, 7 is a driving machine, 8 is a road, 9 is a guardrail, G is a natural ground, N Is a slope.

  Protective net 1 is a combination of Geogrid “Tensor” SS type (product name) for embankment and ground reinforcement as a reinforcing net and a multi-function filter MF-45R-0 (product name) for greening method using synthetic fiber as a vegetation mat. Using. The reinforcing net is made of polypropylene and has a width of 93 cm, a roll length of 25 m, and a nodal point thickness of 2.8 mm. The vegetation mat is a non-woven polyester fabric with seeds and slow-release chemical fertilizer.

  The anchor 2 was an AS345 plated bolt (product name). The dimensions are an outer diameter of 19 mm and a length of 5.0 m.

  As the presser bar 3, AS345 plated bolt (product name) was used. The dimensions are an outer diameter of 16 mm and a length of 1.5 m, which are covered with a polyethylene protective pipe 3a containing carbon black.

  The fixture 4 is formed by bending a round steel 4a having an outer diameter of 16 mm and a length of 30 cm into a U shape to form a hook 4b, and welding a steel pipe 4c having an inner diameter of 27.6 mm and a length of 7 cm to the side surfaces thereof. The surface was hot-dip galvanized and rust-proofed. As the nut 4d, a hexagonal AS plating piece nut (product name) was used. A cap 4e made of vinyl chloride resin was used.

  The protective pipe 5 was made of a vinyl chloride resin having an inner diameter of 25 mm and a length of 500 mm. The sandbag 6 was a cube of about 1.0 m obtained by compacting a material in which soil and crushed stone were mixed.

  Hereinafter, the process of the slope protection method using the restoration of a collapsed road shoulder as an example will be described.

  First, as shown to Fig.2 (a), the collapse part of the slope N is embanked, and the multiple sandbags 6 are piled up on the side surface, and are compacted.

  Next, as shown in FIG. 2 (b), the protective net 1 wound in a roll shape over the surface of the piled sandbag 6 and the lower side thereof is developed vertically, and the plurality of sheets are laid side by side, Temporarily fasten at regular intervals with a presser pin (not shown).

  Next, as shown in FIG. 3 (a), the anchor 2 is attached to the driving machine 7, and the anchor 2 is vibrated while passing through the protective net 1 that has been laid so that the head does not protrude greatly from the ground surface. Place directly up to the depth to reach natural ground G.

  Next, as shown in FIG.3 (b), the rebar 3 is arrange | positioned vertically on the surface of the protection net | network 1 by which it was laid. If the slope N has irregularities, bend it according to the shape. If the length is insufficient, the required number is connected with a coupler (not shown).

  Next, as shown in FIGS. 1, 4, and 5, the cap 4 e is press-fitted so as to cover the head of the anchor 2 to a depth where the upper end is flush with the protective net 1, and the anchor 2 in the cap 4 e is inserted into the anchor 2. The steel pipe 4c of the fixture 4 is passed through the anchor 2 and the head of the protective pipe 5 and the hook 4b is locked to the presser rebar 3 while being press-fitted through the protective pipe 5. Then, the nut 4d is screwed into the head of the anchor 2 and tightened with an impact drill or the like, and the presser rebar 3 is pressed against the protective net 1 to be along the slope N. Finally, the cap 4e is filled with mortar M and hardened so that the fixture 4 is not detached.

  FIG. 6 shows another example of the fixture 4 of the embodiment. In this example, two round bars 4a having hooks 4b are welded symmetrically to both side surfaces of the steel pipe 4c, and one or two presser reinforcing bars 3 can be pressed by one or both side hooks 4b. It is said. In other respects, the reference numeral, the configuration, and the operational effects are the same as in the embodiment.

  The technology of the present invention is used for restoration of a broken road shoulder, repair of a broken revetment, protection of a collapsed rock wall surface, or pre-reinforcement of a slope where such collapse is predicted.

DESCRIPTION OF SYMBOLS 1 Protective net 2 Anchor 3 Reinforcing bar 3a Protective pipe 4 Fixture 4a Round steel 4b Hook 4c Steel pipe 4d Nut 4e Cap 5 Protective pipe 6 Sandbag 7 Driving machine 8 Road 9 Guard rail G Ground mountain M Mortar N Slope

Claims (4)

  Shaping the slope to be protected with earth or sand or sandbag, laying a protective net with a vegetation mat with seeds on the surface of the earth or sand or sandbag, and penetrating the anchor through the protection net to the ground of the slope Drive to the required depth, place the reinforcing bar vertically or sideways on the surface of the installed protective net, attach a fixture with a hook to the head of the anchor that has been installed, and hold the hook of the fixture A slope protection method in which the protective net and the vegetation mat are fixed to the surface of the earth or sand or sandbag by locking to the reinforcing bars.   The fixture is a structure in which a round steel bar is bent into a U shape to form a hook, and steel pipes are welded to the sides of the hook, and the anchor is made of a deformed bar steel that can be screwed onto a nut. The steel pipe of the fixture is passed through the anchor head and the hook is locked to the presser rebar, the nut is screwed onto the anchor head, the fixture is tightened, and the presser rebar is pressed against the protective net. The slope protection method according to claim 1, wherein the protective net and the vegetation mat are attached along the surface shape of earth or sand or sandbag.   The slope protection method according to claim 1 or 2, wherein when the surface of the earth or sand or the sandbag has irregularities, the presser reinforcing bars are bent along the irregularities and arranged on the surface of the protective net.   The slope protection method according to any one of claims 1 to 3, wherein the presser bar is covered with a protective pipe.

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