JP4116794B2 - Slope reinforcement structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slope reinforcing structure including an anchor material embedded in a natural ground and a pressure receiving plate provided on the surface of the natural ground in combination with the anchor material.
[0002]
[Prior art]
In order to reinforce natural slopes and cut slopes of natural mountains to prevent landslides and collapses, and to stabilize slopes, slope reinforcement structures by various methods have been proposed and implemented. In order to stabilize a wide range of slopes, a frame method is used in which slopes are cut once to form slopes and a grid-like frame is formed on the slopes. Such a method frame construction method becomes large-scale, and natural scenery is also damaged. Therefore, instead of this method of frame construction, a slope reinforcement structure that can be easily formed at an appropriate position on the slope without cutting natural trees as much as possible is desired. Such slope reinforcing structure, simple stabilization method of the slope is disclosed in Japanese Patent No. 2813573.
[0003]
In the slope stabilization method described in this publication, holes are formed at appropriate intervals on the ground surface of a slope, both ends of a rust-proof tensile material are bent, and ends of a plurality of tensile materials are formed into one hole. Insert the other end of each tensile material into a separate drilling hole, pass the middle part between the drilling holes along the slope, and inject the hardening material into the drilling hole to fix the tensile material. This is a simple stabilization method for slopes that hold the slope in the middle of the tensile material.
[0004]
In this construction method, a PC steel wire or PC steel wire is bent into a U-shape, its end is inserted into a drilling hole, the other end is inserted into another drilling hole, and two points are formed by one wire. An anchor part (fixing part) is connected and a mortar or concrete is sprayed on the intermediate part of the wire rod between the drill holes to form a pressure receiving plate for pressing the slope.
[0005]
However, in the slope reinforcing structure described in this publication, the wire rod in the middle between the drill holes is loosened and comes into contact with the natural ground, so that the reinforcing bar action against the tensile force cannot be sufficiently obtained. In order to cope with this, a concrete member or the like formed in advance is disposed on the ground surface between the drill holes, and a wire rod must be disposed thereon, which requires a large-scale member and the work is troublesome.
[0006]
On the other hand, it is conceivable that the U-shaped anchor material is composed of an anchor material made of deformed reinforcing bars that does not loosen strongly instead of such a wire anchor material, but both ends of the linear U-shape are grounded. It is practically difficult to insert them simultaneously in the drilling holes.
[0007]
Therefore, it is conceivable to form an L-type reinforcing bar whose head is bent in an L-shape, and use two L-type reinforcing bars to form a substantially U-shape. That is, one L-type reinforcing bar is inserted into the drilling hole, and the reinforcing bar of the bent head is arranged in parallel with the reinforcing bar of the bent head of the L-type reinforcing bar inserted into another drilling hole. The rebar is disposed between two drilling holes. Thereby, a substantially U-shaped anchor material can be formed. By embedding these two parallel bent head reinforcing bars in the concrete pressure-receiving plate, the anchor material and the pressure-receiving plate are combined and the inclined surface is stably pressed by the pressure-receiving plate, and the head reinforcing bar of the anchor material is Rust prevention can be achieved, and the two head rebars arranged in parallel can be made to function as rebars for the tension member of the pressure receiving plate.
[0008]
[Problems to be solved by the invention]
However, when the L-type reinforcing bar is used, in order for the reinforcing bar of the bent head to function as a tension member, a head reinforcing bar having a length over almost the entire length of the pressure receiving plate must be formed. The L-shaped bent head becomes long and the weight on the head side becomes large, handling becomes worse and insertion into the drilling hole becomes difficult.
[0009]
In addition, when installing the concrete form of the pressure receiving plate in which these two reinforcing bars are embedded, the two parallelly arranged reinforcing bars float from the ground surface and are arranged over the entire length of the pressure receiving plate. Therefore, it becomes difficult to assemble the mold, and the mold installation work becomes troublesome.
[0010]
The present invention is based on the above prior art, and can be easily installed on a slope in order to protect the natural landscape, and the anchor material can be smoothly inserted into the drilling hole. An object of the present invention is to provide a slope reinforcement structure that can prevent rusting and can sufficiently function as a tensile material by connecting the anchor material head to the reinforcing bar of the pressure receiving plate.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a pressure-receiving plate made of reinforced concrete by in-situ placement in which at least two reinforcing bars are embedded in the concrete in a state of being substantially parallel to each other along the ground surface, is provided inside the pressure-receiving plate. A slope reinforcement structure in which a head of an anchor material placed on a natural slope is immersed and fixed to the ground surface, and the anchor material is configured such that each head has one of the reinforcing bars with respect to the two reinforcing bars. Provided is a slope reinforcing structure in which at least two end portions are used in a state in which the end portions are connected to one end side and the other end side of the other reinforcing bar so that the axial centers of the connecting portions coincide with each other.
[0012]
According to this configuration, for example, two anchor members are provided in the vicinity of the end portion of the pressure receiving plate, and the head side end portions of these anchor members are axially centered at the connecting portion with respect to the end portions of the reinforcing bars in the pressure receiving plate. By connecting them so that they match, the reinforcing bar can function sufficiently as a tensile material, coupled with the anchoring action of the anchor material, with a simple structure consisting of a single pressure receiving plate, such as trees on slopes, etc. In consideration of the natural landscape, the slope can be reliably and firmly stabilized for each location.
[0013]
In addition, since the reinforcing bar and the anchor material are made of separate bodies and a structure in which they are connected later is adopted , the anchoring material is compared with the case where the reinforcing bar in the pressure receiving plate and the anchor material head use an integral L-shaped anchor. The weight of the head is reduced, handling is improved and insertion into the drilling hole can be easily performed, and the concrete formwork of the pressure plate can be easily installed, thereby improving the workability on site.
[0014]
Note that the pressure receiving plates may be scattered at appropriate positions on the slope, or may be installed continuously in a straight line shape or a lattice shape.
[0015]
In a preferred configuration example, the head portion of the anchor member is bent in a substantially L shape, and the bent portion is connected so that the axial center of the connecting portion coincides with each end portion of the reinforcing bar.
[0016]
According to this configuration, by bending the head of the anchor itself shortly and connecting the reinforcing bar in the pressure receiving plate to this short bent head, the handleability is improved compared to the L-type anchor material in which the long reinforcing bar is integrated, The insertion work of the anchor material becomes easy, and the workability of the pressure receiving plate of the reinforced concrete structure in which the anchor material head functions as the tension material is improved.
[0017]
In another preferred configuration example, the anchor member is formed of a rod-like body, and each end of the reinforcing bar is connected to the head of the anchor member via a coupler so that the axes of the connecting portions coincide with each other.
[0018]
According to this configuration, by connecting the reinforcing bar in the pressure receiving plate to the head of the anchor member made of a rod-shaped body, the handleability is improved as compared with the L-type anchor material in which the long reinforcing bar is integrated, and the anchor material insertion work is improved. It becomes easy and the workability of the pressure-receiving plate of the reinforced concrete structure in which the anchor material head functions as a tensile material is improved. In this case, there is no distinction between the upper and lower end portions of the anchor material itself, and the insertion direction into the drilling hole may be any, and the handleability of the anchor material is further improved.
[0019]
In a further preferred configuration example, the two reinforcing bars are connected by a connecting bar.
[0020]
According to this configuration, since the reinforcing bars separated in parallel in the pressure receiving plate are connected to each other, the two anchor members are continuous with each other, and the function of the reinforcing bar in the pressure receiving plate is effectively exhibited.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a slope reinforcing structure according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a slope reinforcing structure according to the present invention.
[0022]
(A) is sectional drawing, (B) is the figure which looked at (A) from the B direction, (C) is the figure which looked at (A) from the C direction. A hole 2 is formed at an appropriate interval on the slope 1, and an anchor material 3 made of a deformed reinforcing bar is inserted into the hole 2 and filled with a grout material 18. The head portion 3a of the anchor material 3 is bent by a short length with respect to the buried portion 3b in the ground, and is formed in a substantially L shape. Two parallel reinforcing bars 4 are disposed in the pressure receiving plate 6 made of rectangular parallelepiped concrete or mortar along the longitudinal direction. The reinforcing bar 4 in the pressure receiving plate 6 and the anchor material head 3 a are connected via a coupler 5. As a result, the anchor material 3 and the pressure receiving plate 6 are coupled and the inclined surface is stably pressed by the pressure receiving plate 6, and the head 3 a and the reinforcing bar 4 of the anchor material 3 are rust-prevented, and the two are arranged in parallel. The reinforcing bar 4 can effectively function as the reinforcing bar of the tension member of the pressure receiving plate 6.
[0023]
The buried portion 3b of the anchor material 3 in the ground may be covered with a sheath for rust prevention, may be subjected to appropriate resin coating or galvanization, or may be subjected to other resin coating. By performing such a surface treatment, durability is improved. In addition, circular spacers having an outer diameter corresponding to the inner diameter of the drilling hole may be attached at appropriate intervals. By providing the spacer, the anchor material 3 is held at the center of the drilling hole 2, so that the fog in the hole is secured, and the reliability of rust prevention and fixing strength is increased.
[0024]
Thus, by assembling the L-shaped reinforcing bar by connecting the reinforcing bars of the separate during construction by using a coupler 5, the weight of the anchor material than the previously long bent head integrally formed with the L-shaped anchor member It becomes lighter and insertion into the drilling hole 2 becomes easier and handling is improved.
[0025]
In addition, since the anchoring portion (embedding portion 3b) to the ground and the pressure receiving plate 6 are integrated with the anchor material, sufficient strength is obtained by the tensile material reinforcing bar 4 above the pressure receiving plate against the stress from the ground to the pressure receiving plate. Stress from the ground is transmitted to the anchoring portion of the anchor material through the pressure receiving plate, and the ground can be surely pressed by the pressure receiving plate by the fixing force of the anchor material, which can greatly contribute to prevention of deformation of the ground.
[0026]
Incidentally, the anchors member 3 and a linear rebar reinforcement 4 also a linear pressure receiving plate 6, attached to one end of the L-shaped coupler linearly anchor member head, Rebar other end of the coupler You may attach to. If the anchor material 3 is linear, the distinction between the both ends is eliminated, so that the handleability is further improved and the insertion work into the ground is further facilitated . Also, it may be used as the lock bolt as anchor material 3. The lock bolt may be a self-piercing type that is inserted while drilling.
[0027]
When connecting a rebar 4 having a small diameter to the anchor material 3, a different diameter coupler may be used as the coupler 5. The coupler 5 may be a screw-in type, or may be a fixed type in which a grout material is injected into the coupler when bamboo joints are used.
[0028]
FIG. 2 is a schematic view of a pressure receiving plate forming mold in the slope reinforcing structure according to the present invention. The mold 19 is composed of two reticulated side frames 7 and spacers 8 that connect them at a predetermined interval. The net-like side frame 7 is made of, for example, a crimp wire mesh, and is formed by weaving vertical lines and horizontal lines alternately. The spacer 8 includes two vertical bars 9 and two horizontal bars 11 having hooks 10 at both ends. The hook 10 is rotatably wound around the vertical line of the mesh side frame 7 to connect the two mesh side frames 7 together. As a result, a foldable mold 19 is formed. The mold 19 thus formed is placed on the pressure receiving plate installation section 12 on the slope.
[0029]
The one or two to three spacers 8 at both ends of the mold 19 are cut and opened so that one end of the lower lateral stripe 11 is inserted through the bent head 3 a of the anchor material 3. Thereafter, the reinforcing bar 4 (FIG. 1) is connected to the head 3 a of the anchor member 3 with the coupler 5 (FIG. 1), and the reinforcing bar 4 is bound and held to the horizontal bar 11 on the upper side of the other spacer 8.
[0030]
The spacers at both ends of the formwork may have a shape in which both ends of the lower lateral stripe are cut and opened so that they can be installed on the head 3a on either side. When one or both ends of the horizontal stripe are cut, it is desirable to connect the reticulated side frame 7 and the vertical stripe 9 of the spacer with a wire rod for preventing the opening after installing the mold.
[0031]
Further, the mold frame may be divided into three, that is, a mold frame at both ends and a central mold frame at the middle. In this case, the spacer of the end formwork is left in the form of a normal cross beam, and this formwork is inserted and installed from the bent end side of the anchor material head 3a. Thereafter, the intermediate formwork is installed from above, and then the reinforcing bars 4 are arranged from above. In this case, the horizontal stripes on the lower side of the spacers of the molds at both ends may be cut and installed from above.
[0032]
Also, the mold is divided into two parts, one is inserted into the anchor material head 3a, and the other is installed by cutting off the horizontal stripes of the spacer corresponding to the anchor material head 3a. Good. As described above, the shape of the formwork can be various shapes in consideration of ease of handling during construction.
[0033]
In another pressure receiving plate construction procedure, first, a plurality of holes are formed at appropriate intervals for anchor placement in the ground, and a grout material is filled in the ground hole, and the grout is filled in the hole. An anchor material with two heads bent in a substantially L shape while the material is uncured is inserted into the ground, and the two rebars are placed in parallel with each other on the head on the ground surface side. , Open and close the openable unit type wire mesh formwork with the lower horizontal bar open on the rebar part exposed on the ground surface, and place the side part formwork on the end of the unit type formwork with binding wires Fix it, enclose it in a rectangle, fix it to the two exposed anchor material heads on the ground side in parallel through the formwork spacers along the reinforcing bars, and blow mortar into the rectangular mesh formwork. Two anchoring pressure plates are formed by attaching and curing. Also, instead of mortar spraying, concrete spraying or ready-mixed concrete may be placed.
[0034]
Further, another pressure receiving plate construction procedure is shown: drilling holes in the ground at appropriate intervals for anchoring, exposing the heads to the drilling holes, fixing the reinforcing bars with grout material, Open and close the unit-type wire mesh formwork that can be opened and closed on the head exposed on the surface, and fix the side part formwork to the end of the unit-type formwork with a binding wire, enclose it in a rectangle, and the surface side Reinforcing bars are connected to the two exposed anchor heads via L-shaped couplers (the reinforcing bar and the pressure receiving plate are assembled in an L-shape as the reinforcing bars) and fixed in parallel via the formwork spacers. Then, two anchored pressure receiving plates are formed by spraying and curing mortar in the rectangular mesh form.
[0035]
The pressure receiving plate may be formed by protruding the entire surface from the ground surface, or the ground may be excavated and partially or entirely embedded in the ground. Since the shape of the pressure receiving plate is relatively small (about 1.5 to 2 m in length and 50 cm in width or less), it can be appropriately formed at a position avoiding natural trees in the natural ground. This makes it easy to stabilize the slope without compromising the natural landscape.
[0036]
FIG. 3 is a schematic view showing an example of a reinforcing method for reinforcing bars in the pressure receiving plate. As shown in the drawing, the reinforcing bars 4 are connected to each other by using connecting bars 13 having hooks 14 at one or more ends (two in the figure). Thereby, the integration of the pressure receiving plate and the reinforcing bar is strengthened, and the two anchor members 3 are connected to each other, and the function of the reinforcing bar as the tensile material is sufficiently exhibited.
[0037]
FIG. 4 is a schematic view showing another example of a reinforcing method for reinforcing bars in the pressure receiving plate. As shown in the drawing, a plurality of U-shaped connecting bars 16 are used to hook the lower bars 15 on hooks 17 provided at both lower ends. As a result, the two anchor members are connected to each other and the number of reinforcing bars is increased, so that the pressure receiving plate becomes stronger and can withstand large deformation of the ground. In this case, the connecting bars 16 may be formed in a rectangular shape and configured as hoop bars surrounding the four reinforcing bars.
[0038]
【The invention's effect】
In the present invention, the following effects can be obtained.
(1) anchor material and reinforcing bars are divided, because the and their head and rebar anchor material are connected by a coupler or the like as the axis coincides in the connecting portion the ends, the anchor member In the same way as the unit and the reinforcing bar, the stress from the ground acting on the pressure receiving plate is transmitted directly to the anchor material via the reinforcing bar in the pressure receiving plate, and the ground is deformed via the pressure receiving plate by the anchoring force of the anchor material. Can be prevented and the slope can be reliably stabilized.
(2) Since a single pressure receiving plate is fixed to the ground by a plurality of anchor materials, the fixing force to the ground is larger than that of a single anchor material.
(3) Because the reinforcing bar and anchor material are separate, the weight of the anchor material head is lighter than the L-type anchor in which the reinforcing bar in the pressure plate and the anchor material head are integrated, and the handling is improved and the cutting is improved. The insertion work into the hole can be easily performed, and the workability of anchor placement is improved.
(4) Since the head portion of the anchor material is embedded in the pressure receiving plate together with the reinforcing bars, rust prevention treatment of the head portion is unnecessary.
[Brief description of the drawings]
FIG. 1 is a schematic view of a slope reinforcing structure according to the present invention.
FIG. 2 is a schematic view of a pressure receiving plate forming mold in the slope reinforcing structure according to the present invention.
FIG. 3 is a schematic view showing an example of a reinforcing method for reinforcing bars in a pressure receiving plate.
FIG. 4 is a schematic view showing another example of a reinforcing method for reinforcing bars in a pressure receiving plate.
[Explanation of symbols]
1: slope, 2: drilling hole, 3: anchor material, 3a: head, 3b: buried portion, 4: rebar, 5: coupler, 6: pressure plate, 7: mesh side frame, 8: spacer, 9: length Muscle: 10: Hook, 11: Transverse muscle, 12: Pressure receiving plate setting part, 13: Connecting muscle, 14: Hook, 15: Lower muscle, 16: Connecting muscle, 17: Hook, 18: Grout material, 19: Formwork

Claims (3)

The head of an anchor material in which at least two rebars are buried in the concrete in a state of being substantially parallel to each other along the ground surface, and a reinforced concrete pressure plate is cast on the ground slope inside the pressure plate. It is a slope reinforcement structure that immerses the part and fixes it to the ground surface, and the anchor member has one head on one end side of one reinforcing bar and the other end side of the other reinforcing bar with respect to the two reinforcing bars. A slope reinforcing structure, wherein at least two ends are used in a state where the ends are connected so that the axial centers of the connecting portions coincide. 2. The slope reinforcing structure according to claim 1, wherein the anchor member is formed of a rod-like body, and each end of the reinforcing bar is connected to the head of the anchor member via a coupler so that the axes of the connecting portions coincide with each other. .   The slope reinforcing structure according to claim 1 or 2, wherein the two reinforcing bars are connected by a connecting bar.

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