JP3803272B2 - Reinforced earth method for cut slope - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforced earth method for a cut slope that can improve workability and maintain durability over a long period of time.
[0002]
[Prior art]
Conventionally, as a reinforced earth method for cutting slopes,
(1) After assembling the wire mesh formwork on the cut slope, concrete is sprayed to form a grid-like concrete frame, holes are made at the intersections of the concrete frame, and cement milk is placed in the cut slope A method of sticking a reinforcing bar that has been fixed by pouring it into the surface of a concrete frame and fixing it by tightening a nut.
(2) Reinforcing bar reinforcing rods that were shot concrete on the entire surface of the cut slope, applied a steel plate reinforcement to the surface of the shot concrete, and poured cement milk into the cut slope. A method in which the material is projected onto the surface of the steel plate reinforcement and fixed by tightening the nut.
Is the mainstream and is a well-known technique.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional reinforced earth method, in order to fasten and fix the concrete by screwing a steel nut into a reinforcing steel bar that has been poured cement milk into the cut slope, Since the steel plate reinforcing material is rusted and corroded, and there are defects that concrete is likely to deteriorate over time, and the workability is poor, the present inventor previously disclosed a fiber reinforced resin resistant to corrosion in Japanese Patent Application No. 2001-102781. After fixing the legs of the reinforcing bar bent in a U-shape using a bar made of steel, with an excavation hole in the cut slope and inserting and fixing it, the upper end of the reinforcing bar on the cut slope A reinforced earth construction method for cut slopes is provided, in which concrete is cast so as to include a part.
[0004]
However, in the Japanese Patent Application No. 2001-102781, the reinforcing bar is bent in a U-shape, so that the distance between the legs of the reinforcing bar inserted and inserted in the cut slope is fixed. Therefore, it is sufficient if the verticality of the drilling holes drilled in the cut slope and the hole-to-hole spacing are accurate according to the interval, but if the drilling hole is misaligned or falls down, There is a problem that the reinforcing bar cannot be set up accurately in the center of the excavation hole on the cut slope, and there is a problem that workability is deteriorated because the reinforcing bar is heavy and the moment increases.
[0005]
Therefore, in the present invention, the problems in Japanese Patent Application No. 2001-102781 can be solved, the workability of concrete placing work can be improved and the deterioration of the concrete over time can be prevented, and the durability can be maintained for a long time. An object of the present invention is to provide a reinforced earth method for cutting slopes.
[0006]
[Means for Solving the Problems]
The present invention has been made to achieve the above-mentioned problems, and the means for solving the problems are as described below.
That is,
(1) Insert one reinforcing bar of two reinforcing bars bent in an L shape into one excavation hole excavated at two locations in the cut slope, and attach the other reinforcing bar In order to include the reinforcing bar that is exposed on the cut slope after being inserted into the other excavation hole in a state of being floated parallel and facing the cut slope, and pouring cement milk This is a reinforced earth method for cutting slopes, which is characterized by placing concrete in the wall.
(2) After placing the net on the cut slope and placing the foundation concrete on it, placing the concrete on the foundation concrete so as to include the reinforcing bar, and constructing it This is the reinforcing earth method for the cut slope described in the preceding item (1).
(3) The cut according to (1) or (2) above, wherein the concrete is cast so as to include a reinforcing bar by digging the concrete placement part of the cut slope from the cut slope. This is a reinforced earth method for earth slopes.
(4) The concrete according to any one of the above items (1) to (3), wherein the concrete is put into a sleeper shape on a cut slope and placed in parallel in the horizontal and horizontal directions, and then constructed. This is a reinforced earth method for cutting slopes.
(5) Any one of the preceding items (1) to (4), wherein the surface is solidified by placing concrete, and is applied with a permeable inorganic reaction-modifying concrete deterioration inhibitor. This is a reinforced earth method for cutting slopes as described in.
[0007]
And if one reinforcing bar of the two reinforcing bars bent in the L shape is inserted into one excavation hole excavated in two places in the cut slope, two excavation holes Even if the position is not accurate, it is possible to stand up to the center of the excavation hole, and even if the excavation hole is not vertical, the other not inserted in the excavation hole of the L-shaped reinforcing bar is cut. It is possible to adjust the bending so that it is parallel to the soil surface, and the reinforcing bar can be set up and fixed in an accurate state. By placing concrete so as to include the reinforcing bar, the nut It becomes unnecessary to fix by tightening.
[0008]
It is preferable to place a net on the cut slope and place the concrete. The concrete is placed on the stretched net by fixing the base concrete and reinforcing it on the foundation concrete. It is better to cast concrete so as to include the bar material.
If the cut slope is soft, such as shirasu, digging the concrete placement part of the cut slope and placing the concrete prevents rainwater from entering the bottom of the cast concrete. Is done.
[0009]
Furthermore, if concrete is sleepered on the cut slope and placed side by side in parallel in the horizontal direction, it will be less likely to flow until the concrete is placed and hardened, By using a horizontal scaffold, work in the vertical direction is eliminated and the workability of concrete placement work is improved.
[0010]
By applying a permeable inorganic reaction-modifying concrete deterioration preventive agent to the surface of concrete that has been cured and solidified, the concrete deterioration preventive agent penetrates into the concrete and forms a water-impermeable layer. As a result, the reinforcing rods and the like are hardly corroded and the deterioration of the concrete over time is prevented, and the durability is maintained for a long time.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings illustrating examples.
FIG. 1A is a sectional view showing an embodiment, and FIG. 1B is a plan view thereof.
1, insert one reinforcing bars of the L-shape bent two reinforcing bars 1,1, wellbore B was drilled into the ground in two places cut slope A, one of B At the same time, the other reinforcing bar is inserted in the other of the excavation holes B and B in a state of being floated parallel to the cut slope A , and cement milk (not shown) or the like is poured and fixed. After that, the concrete 2 is placed and constructed so as to include the reinforcing bars 1 and 1 exposed on the cut slope. The reinforcing bars 1 and 1 bent in an L shape are fixed by pouring cement milk into the excavation holes B and B.
[0012]
As described above, when placing concrete on the cut slope A, the cut slope A is stretched with a net 4 to prevent the surface from collapsing at the portion where the concrete is not placed, It is preferable to place the foundation concrete 2a on the base 4 to fix the net 4, and to place the concrete 2 on the foundation concrete 2a so as to include the reinforcing bars 1 and 1. The net 4 is preferably a synthetic resin net.
[0013]
In addition, when the cut slope A is soft soil such as shirasu soil, as shown in FIG. The erosion does not reach the bottom surface of the placed concrete, and the concrete and the slope are integrated to prevent collapse.
[0014]
Next, FIG. 3 and FIG. 4 which show the example of the formwork about placing concrete so that the said reinforcement bar | burr may be included are demonstrated.
FIG. 3 shows a state in which the reinforcing bars 1 and 1 which are fixed by inserting the excavation holes B and B excavated in the cut slope are faced in parallel and are floated on the cut slope. FIG. 4 is an enlarged cross-sectional view taken along the line TT in FIG. 3.
[0015]
The mold 5 is a horizontally long rectangular synthetic resin corrugated cardboard mold. Inside the mold 5, both ends of the horizontal frame ties 6, 6,... Are assembled by screwing assembly screws 9, 9,... Through the cones 7, 7,. .. Are fitted between the butter plates 8, 8,... And the outer surface of the mold 5 to support the outside of the mold 5. Float on the cutting slope of the reinforcing bar 1, 1 bent in an L shape between the left and right bent parts of the inner and upper horizontal frame ties 6, 6, ... and the vertical frame ties 6a, 6a, ... One side is placed and supported in parallel.
[0016]
In addition, the assembly of the said formwork shows one Example of the formwork assembly in the concrete placement of this invention, a formwork assembly is not limited to this, The wooden board type | mold conventionally used You may make it assemble with a frame etc. and cast concrete.
[0017]
The above formwork assembly is assembled in parallel in the horizontal and horizontal direction on the cut slope A with the net 4 stretched. First, concrete for placing the foundation concrete 2a shown in FIG. 1 is placed in the formwork. Pour and cure. The surface of the hardened and hardened concrete is coated with a permeable inorganic reaction-modifying concrete deterioration inhibitor.
[0018]
Next, in order to place the concrete 2 on the foundation concrete 2a coated with the concrete deterioration preventive agent, the concrete is poured into the formwork, the reinforcing bars 1 and 1 are covered with concrete, and the upper surface is troweled and cured. Solidify. The volume ratio of the foundation concrete 2a and the concrete 2 that has been cast is approximately 1: 3 to 4, and the volume ratio in the case where it is necessary to dig the cut slope and cast the concrete is generally 1 : Although it is good to set it as about 1-2, it is not limited to this. Since concrete is cast in the horizontal and horizontal directions, there is little flow of concrete and the placement work is easy.
[0019]
After pouring concrete into the mold and curing it, the assembled mold 5 is disassembled. That is, by loosening and removing the assembly screws 9, 9,..., The butter plates 8, 8,... And the butter material 10, 10,. It becomes a concrete block. In order to make it easy to pull the mold 5 upward, it is preferable to provide a draft angle. Further, since the screw holes of the synthetic resin cones 7, 7,... Assembled in contact with the inside of the mold 5 are exposed on the side surfaces, it is preferable to bury the concrete and finish it.
[0020]
After dismantling the mold, a permeable inorganic reaction-modifying concrete deterioration inhibitor is applied to the entire exposed concrete surface. A well-penetrated inorganic reaction-modifying concrete deterioration inhibitor penetrates to the inside, forms a water-impermeable layer and blocks liquids and gases, prevents deterioration of the concrete over time, and is included in the concrete. When the reinforcing bars 1 and 1 and the formwork assembly member are corrosive materials, they are less likely to corrode.
[0021]
The reinforcing bars 1 and 1 and the formwork assembly members included in the concrete are made of metal such as rebar, fiber reinforced resin, synthetic resin, etc., but in the case of corrosive metal, the surface is coated with epoxy resin It is preferable to perform a corrosion prevention treatment such as post glass coating, galvanized glass coating (or simply glass coating or epoxy resin coating).
[0022]
5 and FIG. 6 show an embodiment in which concrete is placed in parallel with the horizontal direction in the form of a sleeper on the cut slope as described above.
FIG. 5 is a horizontal horizontal view in which concrete 2, 2,... Are made into a sleeper shape on a cut slope A where a net 4 is stretched so as to include two reinforcing bars 1, 1 bent in an L shape. FIG. 6 shows an example of construction that is placed in the direction of the columns arranged at equal intervals in the direction. FIG. 6 is a diagram in which the intervals of the concrete 2, 2,. Thus, an embodiment of construction in which concrete 2, 2,...
The sleeper-like concrete 2 may be extended in the horizontal and horizontal directions to reduce the number of concrete placements. Further, the L-shaped reinforcing bar may be disposed in the lattice-shaped concrete placement.
[0023]
【The invention's effect】
As described above, the present invention has the following effects.
That is,
(1) Since one of the two reinforcing bars bent in an L-shape is inserted into the two excavation holes excavated in the cut slope, each of the two excavation holes Even if the interval and the verticality of the drilling hole are not accurate, it can be set up accurately at the center of the drilling hole. Workability is improved.
[0024]
(2) Since the concrete is placed so as to include the reinforcing bar exposed on the cut slope, it is not necessary to tighten and fix the nut to the reinforcing bar, saving labor and reinforcing bar. The risk of corroding concrete due to raindrops does not occur and the aging of the concrete is reduced.
[0025]
(3) Since concrete is placed in the shape of a sleeper in the horizontal and horizontal directions, the flow of concrete is low, and by using a horizontal scaffold, there is no work in the vertical direction, and the concrete placement work is performed. It is easy to improve the workability of the placing work.
[0026]
(4) Further, by applying a permeable inorganic reaction-modifying concrete deterioration preventing agent to the concrete surface that has been hardened and hardened by casting, the concrete deterioration preventing agent penetrates into the concrete and the impermeable layer. Is formed, the liquid and gas are shut off, and the reinforcing bar and the like are further hardly corroded, and the deterioration of the concrete is prevented and durability can be maintained for a long time.
[Brief description of the drawings]
1A and 1B are drawings showing an embodiment of the present invention, in which FIG. 1A is a sectional view and FIG. 1B is a plan view;
FIG. 2 is a cross-sectional view of an essential part showing an embodiment when the cut slope is soft.
FIG. 3 is a plan view showing an embodiment of a formwork for placing concrete.
4 is an enlarged cross-sectional view taken along the line T-T in FIG. 3;
FIG. 5 is a perspective view showing an example of concrete placement work.
FIG. 6 is a perspective view showing an example of concrete placement work.
[Explanation of symbols]
A Cut slope B Excavation hole 1 Reinforcing bar 2 Concrete 2a Foundation concrete 3 Spacer 4 Net 5 Formwork 6 Horizontal frame tie 6a Vertical frame tie 7 Cone 8 Butter plate 9 Assembly screw 10 Batter

Claims (5)

Insert one reinforcing bar of two reinforcing bars bent into an L shape into one excavation hole excavated at two locations in the cut slope, and insert the other reinforcing bar into the cut Inserted into the other excavation hole in a state of being floated parallel and facing on the slope, poured cement milk and fixed, and then poured the concrete to include the reinforcing bar exposed on the cut slope. Reinforced earth method for cutting slopes, characterized by installation and construction. A method comprising: placing a net on a cut slope, placing foundation concrete thereon, and then placing the concrete so as to include a reinforcing bar on the foundation concrete. 1. A reinforced earth method for cutting slopes according to 1. 3. The reinforcement of the cut slope according to claim 1 or 2, characterized in that the concrete placement portion of the cut slope is dug down from the cut slope and the concrete is placed so as to include a reinforcing bar. Earthwork method. The cut slope according to any one of claims 1 to 3, wherein the concrete is put into a sleeper shape on the cut slope and placed in parallel in a horizontal and horizontal direction. Reinforced earthwork method. 5. The construction according to claim 1, wherein a concrete deterioration preventing agent having a permeable inorganic reaction property is applied and applied to the surface solidified by placing concrete. Reinforced earthwork method for cut slope.

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