JPH0931993A - Installation of pressure-receiving board for side slope protection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a large-sized construction machine unnecessary installing pressure-receiving boards, and to make easy arrangement of forms possible. SOLUTION: A flat part is formed on a side slope N around a part wherefrom a tendon 3 of an anchor driven into the ground projects above the ground. After a reinforcing bar basket 11 is arranged on the flat part, a fabricated synthetic resin form 12, composed of an upper wall 12a and side walls 12b and equipped with a cylindrical part 38 at the same height as of the side walls 12b and extending downward from the periphery of a tendon inserting hole formed at the center of the upper wall 12a and an injection part 39 to which a grout supply hose 20 is connected, is put over the reinforcing bar basket 11 with the tendon 3 inserted at its projecting part through the tendon inserting hole. After the form 12 is temporarily anchored with a tension given temporarily to the tendon 3, the inside of the form 12 is filled with concrete or mortar, and a pressure-receiving board is formed as the concrete or mortar hardened. After the form 12 is removed, the tension is given formally to the tendon 3 and the tendon is anchored to the pressure-receiving board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a pressure receiving plate for slope protection.

[0002]

2. Description of the Related Art As a conventional construction method of a pressure receiving plate for slope protection, as shown in FIG. 15, an anchor (5
Pass the ground protrusion of the tendon (51a) in 1) through the transmission tube (53a) of the bearing plate (53) installed on the slope to the tendon (51a).
After provisionally tensioning and attaching it to the bearing plate (53), attach the rebar cage (54) on the bearing plate (53), and attach the wire mesh form (55) to surround the bearing plate (53). Install and place concrete in the formwork (55)
(C) is sprayed and filled, and after the pressure plate is formed, the tendon (5
1a) was permanently strained and fixed on the bearing plate (53).

[0003]

However, in the above-mentioned conventional method, not only a large machine such as a truck crane is required to install the wire netting mold, but also a wire net is assembled to form the mold. It was troublesome. The present invention
It is an object of the present invention to provide a method for constructing a pressure receiving plate for slope protection that does not require a large machine for construction and can easily install a formwork.

[0004]

According to the first aspect of the present invention,
After forming a flat part on the slope around the ground protrusion of the tendon in the anchor cast in the ground, and arranging the flat part in a state where the reinforcing bars are assembled in the required form, from above,
Made of synthetic resin with an upper wall, a peripheral wall, a cylindrical part extending downward from the peripheral edge of the tendon insertion hole formed in the center of the upper wall and having the same height as the peripheral wall, and an injection port to which the grout supply hose is connected. Place the formwork on the flat part with the tendon insertion hole passing through the projecting part of the tendon over the rebar, and temporarily attach the tendon to the formwork and then attach it to the formwork, then concrete or mortar inside the formwork. Is filled and cured to form a pressure receiving plate, and after removing the mold, the tendon is fully tensioned and fixed to the pressure receiving plate.

According to a second aspect of the present invention, the slope of the anchor placed in the ground in the vicinity of the above-ground protrusion of the tendon is rectified, and then the reinforcing bar is formed on the slope centering on the above-ground protrusion of the tendon. After arranging in a state where it is assembled into the required form,
An assembly including an upper wall, a peripheral wall, a cylindrical portion extending downward from the peripheral edge of a tendon insertion hole formed in the center of the upper wall and having the same height as the peripheral wall, and an inlet to which a grout supply hose is connected. The synthetic resin mold is placed on the flat part with the tendon insertion hole passing through the projecting part of the tendon over the rebar, and the tendon is temporarily tensioned and put on the formwork. After placing the formwork auxiliary member on the slope along the required part of the outer surface of the peripheral wall of the formwork so as to close the gap between the lower end of the peripheral wall and the slope, concrete or mortar is poured and filled into the formwork. The pressure receiving plate is formed by curing, the mold is removed, and then the tendon is fully tensioned and fixed to the pressure receiving plate.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. As shown in Fig. 1, the anchor hole (1) was excavated from the slope (N) to the underground fixing layer, and the hole was formed.
Insert the tendon (3) passed through the sheath (2) into the (1) and fill the grout material (4) up to near the opening of the hole (1) to set the anchor in the ground. To do.

Next, as shown in FIG. 2, a steel retaining tube (5) is put over the sheath (2) from the upper part of the tendon (3) and positioned on the upper part of the grout material (4). Pour the uneven mortar (6) into the anchor hole (1) and its surroundings, and
Form (7).

Thereafter, as shown in FIG. 3, the anchor pin
(9) fix the epoxy resin coated rebar cage (11) on the flat part (7) via the spacer (8), and the ground of the tendon (3) passed from the rebar cage (11) to the sheath (2). The protrusion should protrude upward.

After fixing the rebar cage (11) to the flat portion (7), as shown in FIG. 4, from above, the upper wall (12a) and the peripheral wall (12
b), the tendon insertion hole (3) formed in the center of the upper wall (12a)
Assembled type that is square in plan view, with a cylindrical portion (38) extending downward from the peripheral edge of (7) and having the same height as the peripheral wall (12b) and an inlet (39) to which the grout supply hose (20) is connected. Form the rigid vinyl chloride formwork (12) over the reinforcing bar cage (11) with the tubular part (38) and the tendon insertion hole (37) passing the above-ground protruding part of the tendon (3) into the flat part ( Install in 7). Rubber packing is attached to the peripheral wall (12b) of the formwork (12) and each lower end of the tubular part (38).
(13) is installed.

The formwork (12) consists of the edge of the upper wall (12a) and the peripheral wall.
The flange formed on (12b) and the bolt (30a) and nut.
It can be assembled by tightening at (30b). Reference numeral (41) denotes an exhaust port formed above the injection port (39) in the peripheral wall (12b) of the mold (12).

Next, on the upper wall (12a) of the formwork (12), the upper wall
The two steel square pipes (14) are arranged in parallel over the entire width of (12a), the pressure bearing plate (15) is arranged on it, and the tendon (3) is temporarily tensioned by the jack (16). The formwork (12). The temporary tension force corresponds to the pressure applied to the formwork (12) when the formwork (12) is filled with concrete. During the temporary tension, the rubber packings (13) attached to the peripheral wall (12b) of the mold (12) and the lower ends of the tubular part (38) are pressed against the flat surface (7) to form the mold. (12) The inside is made watertight.

The square pipe (14) may be assembled in a cross beam shape. Further, when the square pipe (14) is arranged on the upper wall (12a) of the formwork (12), it is preferable that the upper wall (12a) be processed so that the square pipe (14) does not slip. .

Next, as shown in FIG. 5, the grout supply hose (20) is connected to the inlet (39) of the mold (12) to form the mold (12).
Pour concrete into the inside. Then, by the curing, as shown in FIG. 6, the pressure receiving plate (17) is formed, and after confirming the strength of the pressure receiving plate (17), the form (12) is removed and the pressure receiving plate (17) is placed at the center. Pour the rust preventive oil (18) into the formed through hole (43), place the pressure bearing plate (15) on the pressure receiving plate (17), and then use the jack (16) to place the tendon (3) on it. Tension and pressure plate (1
Fix in 7).

The formwork (12) may be filled with mortar instead of concrete. Then, as shown in FIG. 7, the head cap (19) is mounted on the pressure bearing plate (15), and the rust preventive oil (18) is put in the head cap (19). In addition, a thick layer (21) of vegetation base material is formed on the slope (N) around the pressure receiving plate (17), and the slope on the pressure receiving plate (17) is also formed.
(N) Ivy (22) is vegetated on the right side or slope
While vegetation sheet (23) is attached to (N), seeds (24) are sprayed, and a planting box (25) is arranged on the upper side of the slope (N) of the pressure receiving plate (17), and the box is placed. Lock bolt (25) (26)
Secure the slope (N) and the pressure plate (17) to the upper side of the plant, and plant shrubs (27) in the planting box (25).

The cylindrical portion (38) of the form (12) is made of the above-mentioned rust preventive oil.
It forms a through hole (43) in the center of the pressure receiving plate (17) in which (18) is inserted, and also serves as a non-slip when installing the formwork (12) on the flat part (7) after anchoring. It is a thing.

FIG. 8 shows another embodiment of the present invention when the unevenness of the slope is large. After placing the anchor in the ground, first fix the uneven mortar (6) in the anchor hole (1).
After filling the hole (1) by pouring, the rebar cage (11) and the formwork (12) are installed, and the lower end of the peripheral wall (12b) of the formwork (12b) and the slope.
For places where there is a gap (S) between (N), use a plate-shaped frame auxiliary member (28) made of hard vinyl chloride that has been cut to a size that can close the gap (S), and close the gap (S). On the perimeter wall of the formwork (12)
(12b) By arranging on the slope (N) along the required part of the outer surface, and by driving the anchor pin (29) on the slope (N) so as to contact the outer surface of the formwork auxiliary member (28). After fixing the formwork auxiliary member (28) to the slope (N), by spraying the foamed polyurethane resin (31) from the outer surface of the formwork auxiliary member (28) to the outside slope (N), The space between the formwork auxiliary member (28) and the slope (N) is kept watertight.

In the above-described two embodiments, the formwork 12 has a square shape in plan view as shown in FIG. 9, but is not limited to this shape and is shown in FIGS. As seen from the plane, the rectangular formwork (32) and the circular formwork (3
3), cross-shaped formwork (34), regular hexagonal formwork (35), regular octagonal formwork
A mold of any shape can be used as necessary such as (36).

[0018]

According to the construction method of the present invention, a mold is installed on the slope and mortar or concrete is poured into the mold to form a pressure receiving plate. The mold is made of synthetic resin. Since it is lightweight, and it is an assembly type, it does not require a large machine such as a truck crane unlike the conventional wire mesh formwork, and after the formwork is disassembled it is manually transferred to the site and then the worker It is convenient because the mold can be easily assembled. Further, since the construction method of the present invention is to inject mortar and the like into the synthetic resin mold, the generation of dust, noise, and vibration are significantly less than those of the conventional construction method. Most suitable for pressure plate construction.

Further, according to the construction method of the present invention, unlike the conventional method of spraying into a wire mesh mold, mortar or concrete having good fluidity is poured into the synthetic resin mold. The obtained pressure plate has high watertightness, few voids, and has a beautiful finished surface.Moreover, mortar or concrete with a large amount of cement and a fast-strength type can be used, which is smaller than conventional methods. It is possible to economically obtain a high-strength pressure receiving plate having a cross-sectional area and capable of receiving a large anchor tension force in a short period of time. Further, since the mold is made of synthetic resin, it can have a complicated shape and color according to the request of the client.

Further, in the construction method of the present invention, since the pressure-receiving plate is constructed independently, the pressure-receiving plate is not affected by the ground subsidence due to the tension of tendon at the anchor at a place where the formation changes drastically or a place where the ground strength is weak. It follows and has no effect on other pressure receiving plates.

According to the second aspect of the present invention, a mold auxiliary member is installed on the slope along a required portion of the outer surface of the peripheral wall of the mold so as to close the gap between the lower end of the peripheral wall of the mold and the slope. Therefore, it is suitable for construction of the pressure receiving plate on the slope where the unevenness is remarkable.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing how an anchor is driven in the present invention.

FIG. 2 is a cross-sectional view showing an unrectified state of a slope in the present invention.

FIG. 3 is a cross-sectional view showing an installed state of a reinforcing bar cage according to the present invention.

FIG. 4 is a cross-sectional view showing a temporary tension state of the tendon according to the present invention.

FIG. 5 is a cross-sectional view showing a state of injecting mortar or the like into a mold according to the present invention.

FIG. 6 is a cross-sectional view showing a main tension state of the tendon after forming the pressure receiving plate in the present invention.

FIG. 7 is a sectional view showing an embodiment of vegetation around the pressure receiving plate after the main tension of the tendon.

FIG. 8 is a cross-sectional view showing a construction state in which a mold frame auxiliary member is used to close a gap between the mold frame and a slope.

FIG. 9 is a plan view of a mold according to the present invention.

FIG. 10 is a plan view showing a modified example of the mold according to the present invention.

FIG. 11 is a plan view showing another modified example of the mold according to the present invention.

FIG. 12 is a plan view showing another modification of the mold according to the present invention.

FIG. 13 is a plan view showing another modified example of the mold according to the present invention.

FIG. 14 is a plan view showing still another modified example of the mold according to the present invention.

FIG. 15 is a cross-sectional view showing a conventional construction method.

[Explanation of symbols]

 (3): Tendon (7): Plane part (11): Reinforcing bar cage (12): Synthetic resin formwork (12a): Formwork upper wall (12b): Formwork peripheral wall (17): Pressure plate ( 20): Grout supply hose (28): Formwork auxiliary member (37): Tendon insertion hole (38): Cylindrical part (39): Filling port

Claims (2)

[Claims] 1. A flat portion is formed on a slope around an overhanging portion of a tendon of an anchor placed in the ground,
After arranging the reinforcing bars in the required shape on the flat part, from above, extend downward from the peripheral wall of the upper wall, the peripheral wall, and the tendon insertion hole formed in the center of the upper wall, and have the same height as the peripheral wall. The assembly type synthetic resin mold with an injection port to which the shaped part and the grout supply hose are connected is placed on the flat part with the tendon insertion hole passing the above-mentioned protruding part of the tendon on the reinforcing bar, and the tendon is attached. After temporary tension and hypothetical fitting to the formwork,
Slope protection, characterized in that the pressure receiving plate is formed by pouring and filling concrete or mortar into the form and hardening it, and after removing the form, the tendon is fully tensioned and fixed on the pressure receiving plate. Construction method of pressure plate. 2. After fixing the slope in the vicinity of the ground protrusion of the tendon of the anchor placed in the ground, rebar is assembled into the required shape around the ground protrusion of the tendon. After arranging in a state, the cylindrical portion and the grout supply hose extending downward from the upper wall, the peripheral wall, and the peripheral edge of the tendon insertion hole formed in the center of the upper wall and having the same height as the peripheral wall are connected. Place a prefabricated synthetic resin mold with a pouring port on the rebar with the tendon insertion hole through the ground protrusion of the tendon, and place it on the flat surface. Then, after installing the formwork auxiliary member on the slope along the required portion of the outer surface of the peripheral wall of the formwork so as to close the gap between the lower end of the peripheral wall of the formwork and the slope, concrete or Injecting and filling mortar and hardening it to form a pressure plate A method for constructing a pressure receiving plate for slope protection, which is characterized in that after forming and removing the formwork, the tendon is fully tensioned and fixed to the pressure receiving plate.