JP2879428B2 - Construction method of pressure plate - 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 constructing a pressure receiving plate for preventing collapse of a slope or the like.

[0002] In this specification, concrete includes mortar outside concrete and anchors include lock bolts outside the anchor.

[0003]

2. Description of the Related Art When a precast pressure receiving plate is applied to a construction surface having irregularities, there is a problem that the pressure receiving plate does not evenly contact the construction surface. When the anchoring force is applied to the plate, concentrated load is applied.Therefore, when the pressure receiving plate is made of concrete, there is a problem that unexpected cracks occur.When the pressure receiving plate is made of steel or synthetic resin, deformation occurs. There was a problem that it became larger than the design.

[0004] Conventionally, in order to solve the above-mentioned problems, a construction surface having irregularities is smoothed, concrete is cast on the construction surface and smoothed, or a cushion made of styrene foam or the like is provided on the construction surface. A precast pressure plate was installed through the material.

[0005]

The former two methods require a great deal of manpower, and it is difficult to achieve a smooth finish with high precision because the work of smoothing the construction surface is performed on a slope. However, the latter has a problem in durability of the cushion material.

An object of the present invention is to provide an excellent pressure receiving plate construction method which does not have the above-mentioned problems even when the construction surface is uneven.

[0007]

According to a first aspect of the present invention, there is provided a method for constructing a pressure receiving plate, wherein a contour of a precast member is provided on an uneven construction surface on which an anchor is placed in the soil where a precast pressure receiving plate is to be installed. A step of fixing a larger and similar encircling formwork, a step of filling concrete in the formwork, a step of finishing the upper surface of the filled concrete before curing to a smooth surface, and a step of curing the concrete smooth surface The method includes a step of arranging a precast pressure receiving plate thereon and a step of tensioning an anchor.

[0008] The construction method of the pressure receiving plate according to the second aspect of the present invention is as follows.
A step of arranging a precast pressure-receiving plate having a surrounding metal mesh or a synthetic resin formwork on the periphery of the lower surface on an uneven construction surface in which an anchor is placed in the soil; The process of deforming the lower part to the unevenness of the construction surface in this way, the process of integrating the construction surface with the precast pressure receiving plate through concrete by filling concrete in the form and hardening, and the secondary anchor Tensioning step.

[0009] The invention of claim 1 is suitable for construction on a slope having relatively large irregularities on the construction surface. The height of the mold is suitably 10 to 30 cm, and the height of the concrete filled in the mold and smoothed is 2 cm higher than that of the mold.
Preferably it is ~ 3 cm lower or equal. It is preferable to use a metal net or a synthetic resin net as the material of the mold, but the material is not limited to this.

The invention of claim 2 is suitable for construction on a slope or a stone retaining wall having relatively small irregularities on the construction surface. The height of the mold is suitably 10 to 30 cm in the former case and 10 to 20 cm in the latter case. Specific examples of the wire mesh used include crimp wire mesh, welded wire mesh, and expanded metal. Also,
In addition to the wire mesh, a synthetic resin wire mesh that can be deformed by the primary tension of the anchor can also be used. The size of the mesh is preferably such that the concrete filled in the form does not leak much, specifically, 10 to 15 mm. If the mesh is larger than this, one of the inner and outer surfaces of the form is covered with paper or cloth, such as cardboard, having cutouts or holes for venting. The cardboard may also be used those wires are brought into the parallel hollow portion. The diameter of the mesh wire, especially the diameter of the mesh wire in the height direction of the formwork, has a supporting force for the precast pressure-receiving plate, and due to the own weight of the precast pressure-receiving plate and the anchor force during the primary tension,
The projecting surface can be deformed or buckled by the convex portion, so that the diameter of the precast pressure receiving plate can be held at a predetermined position. In the case of a wire mesh, specifically, the diameter of the mesh wire is 2.0
It is determined from the range of .about.2.6 mm by the weight of the precast pressure-receiving plate and the anchoring force during primary tension.
Due to the hardness of the construction surface and the unevenness of the construction surface, when the lower end of the metal mesh or synthetic resin mesh form bites into the construction surface unevenly or unbalance occurs in the deformation of the lower end, excessive In order to prevent the deformation, a spacer made of a square bar or a camber may be appropriately interposed between the construction surface and the formwork. The spacer is removed after filling the form with concrete.

According to the first aspect of the present invention, when a wire mesh is used as a mold, its type, mesh size,
The coating of paper or cloth on the mold is the same as described above. However, since the upper part of the net is open, notches or holes for venting the paper or cloth are unnecessary.

In the first and second aspects of the present invention, concrete examples of the material of the precast pressure receiving plate include concrete,
Steel and synthetic resin can be used. When viewed from a plane, any shape such as a cross, a rectangle, a regular hexagon, a regular octagon, and a circle can be adopted as needed.
Further, when there is a large recess between the construction surface and the formwork and a gap is generated, a gap closing member such as an auxiliary wire mesh is attached to a required portion of the lower edge of the formwork in a hanging manner.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention according to claim 1 is as follows.
This is shown in FIGS. First, the contour of the precast pressure plate (1) is placed on the uneven construction surface (3) where the anchor (2) is installed in the soil where the cross-shaped precast pressure plate (1) (see Fig. 6) is to be installed. A slightly larger and similar enclosed wire mesh formwork (4) is vertically secured by a plurality of anchor pins (5) (see FIG. 1). At this time, the formwork (4)
Height is determined based on the unevenness of the construction surface (3).

As for the wire netting formwork (4), four substantially U-shaped wire nets (6) are prepared as seen from a plane (see FIG. 2).
It is obtained by combining (6) with a wire (7) so as to form a cross (see FIG. 3). And formwork (4)
Each of the U-shaped wire meshes (6) constituting the two sides of the mold is opposed to each other so as not to open outward due to the concrete filling pressure in the formwork (4).
Between the two walls, stop the bar-shaped opening stopper (8) with hooks at both ends (see FIG. 4. In FIGS. 1 and 6, the opening stopper is shown).
(8) is omitted). Here, since the form (4) is cross-shaped, a substantially U-shaped wire mesh was used.However, since the shape of the form (4) changes depending on the shape of the pressure receiving plate (1), the wire mesh prepared for the combination is used. Has an L shape or any other shape.

Depending on the unevenness of the construction surface (3), the construction surface (3)
If there is a particularly large gap between the mold and the formwork (4), a gap closing member (9) consisting of an auxiliary wire mesh is tied down with a wire (10) to a predetermined portion of the lower edge of the formwork (4). Stop and close the gap (see FIG. 1).

Next, concrete is sprayed into the form (4) to fill it. When the upper surface of the form (4) reaches a level slightly lower than the height of the form (4), the spraying is stopped, and the filled concrete before hardening is troweled. The upper surface of (11) is finished to a smooth surface (11a) (see FIG. 5).

Finally, the hardened concrete smooth surface (11)
a) The precast pressure plate (1) is suspended by a crane and placed on it, and after tensioning the anchor (2), a cap (13) is attached to the opening (12) of the precast pressure plate (1) (Fig. 6). reference). When the formwork (4) is fixed to the construction surface, the anchor (2) may be primarily tensioned.

An embodiment of the second aspect of the present invention is shown in FIGS. First, a cruciform precast pressure plate (1) with an encircling metal mesh formwork (14) on the lower surface periphery on the uneven construction surface (3) with an anchor (2) installed in the soil
Is suspended vertically with a crane (see FIG. 7). The height of the formwork (14) is determined based on the unevenness of the construction surface (3).

As shown in FIG. 2, the wire mesh formwork 14 has four substantially U-shaped wire meshes as viewed from the plane, and the base portions are preliminarily embedded at predetermined intervals on the lower peripheral edge of the precast pressure receiving plate 1. Wires (16) for the downwardly protruding hardware (15)
Obtained by sintering Bukoto knot-tying with cruciform and without, in the same manner as shown in FIG. 3 the four substantially U-shaped wire mesh with each other with a wire in
You . Instead of the hardware (15), a part of the reinforcing bar may be buried in the precast pressure receiving plate (1), and the rest may be projected downward.

Next, the anchor (2) is primarily tensioned to deform the lower part of the form (14a) into irregularities on the construction surface (3) by the anchor force (see FIG. 8).

Next, a fluid concrete pumped into the mold (14) by a pump is poured and filled with a hose (17) from outside the mold (14), and the concrete (11) is hardened. ) Through the construction surface (3) and the precast pressure plate
(1) is integrated (see FIG. 9).

Finally, after the anchor (2) is tensioned secondarily,
A cap (13) is provided on the opening (12) of the precast pressure receiving plate (1) (see FIG. 10). When the anchor (2) is secondarily tensioned, the anchor force is evenly transmitted to the construction surface (3).
Concentrated load is not applied to part of the precast pressure plate (1).

In the above embodiment of the present invention, the wire mesh is used for the formwork (14) because of the use of one of the anchors (2).
Due to the anchoring force due to the next tension, the lower part of the form (14a) is easily deformed along the unevenness of the construction surface (3), the state of concrete filling in the form (14) can be confirmed from the mesh, and the concrete filling At this time, the air between the construction surface (3) and the precast pressure receiving plate (1) escapes from the mesh, and the air cannot be trapped in the concrete.

FIG. 11 shows a state in which, when the mesh of the wire mesh formwork (24) is large, the inner surface thereof is covered with a concrete leakage prevention paper (18). The upper edge of the concrete leakage prevention paper (18) is provided with a number of air vent cutouts (19) and a concrete injection cutout (20).

[0025]

According to the present invention, a pressure receiving plate can be constructed without any problem even if the construction surface has irregularities.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a first step of the invention of claim 1;

FIG. 2 is a perspective view of four substantially U-shaped wire meshes prepared for making a wire mesh formwork used in the invention of claim 1;

FIG. 3 is a perspective view of a wire mesh formwork assembled by the four substantially U-shaped wire meshes of FIG. 2;

FIG. 4 is a perspective view showing a state in which an opening stopper is attached to the wire mesh formwork of FIG. 3;

FIG. 5 is a vertical sectional view showing a second step of the invention according to claim 1;

FIG. 6 is a vertical sectional view showing a third step.

FIG. 7 is a vertical sectional view showing a first step of the invention of claim 2;

FIG. 8 is a vertical sectional view showing the second step.

FIG. 9 is a vertical sectional view showing the third step.

FIG. 10 is a vertical sectional view showing a fourth step.

FIG. 11 is a vertical sectional view corresponding to FIG. 7, using a wire mesh formwork whose inner surface is covered with concrete leakage prevention paper.

[Explanation of symbols]

 (1): Precast pressure plate (2): Anchor pin (3): Construction surface (4) (14) (24): Formwork (11): Concrete (11a): Concrete smooth surface (14a): Formwork beneath

Claims (2)

(57) [Claims] 1. A step of fixing an enclosed formwork larger than the contour of the precast member and similar to the contour of the precast member to the uneven construction surface where the anchor is cast in the soil where the precast pressure receiving plate is to be installed. , A step of filling concrete in the formwork, a step of finishing the upper surface of the filled concrete before curing to a smooth surface, a step of arranging a precast pressure plate on the smooth surface of the concrete after curing, and a step of tensioning the anchor A method of constructing a pressure receiving plate, comprising: 2. A step of arranging a precast pressure-receiving plate having a surrounding metal mesh or a synthetic resin form around the lower surface on an uneven construction surface in which an anchor is cast in the soil; A process of straining and deforming the lower part of the form to the unevenness of the construction surface, and a process of integrating the construction surface and the precast pressure receiving plate through concrete by filling concrete in the form and hardening it And a step of secondary tensioning the anchor.