JP2000303477A - Ground collapse prevention method and device used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground collapse prevention method capable of greatly reducing work accompanied with vibration or impact such as anchor driving as much as possible to require no temporary work, promoting safety of construction work and, at the same time, realizing the reduction of a construction period of time and surely protecting ground. SOLUTION: A plurality of joint support members 10 are provided at the circumferential edge section surrounding the objective ground 40 such as inclined ground, bedrock or the like having the possibility of collapse as expected and, at the same time, a plurality of pressure holding plates 20 are mounted to proper positions on the objective ground 40. Connections are made among the pressure holding plates 20 or between the pressure holding plates 20 and the joint support members 10 with a plurality of joint members 30, the joint members 30 are stretched over the objective ground 40, and tensile force of the joint members 30 is converted into push force to the objective ground 40 of the pressure holding plates 20 to prevent the collapse of the objective ground 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing collapse of a ground such as an inclined surface or a flat ground, and more particularly to a method for preventing collapse which is suitable for construction in a place where work is difficult, and members used therefor. It is about.

[0002]

2. Description of the Related Art A mountain in a mountainous area, a slope forming a side of a road or a cliff is apt to collapse, for example, when a large amount of rain falls. Need to be protected. Of course, the partial flat ground in the mountainous area must be protected from being washed away by a large amount of rainwater from the surroundings. In order to prevent the collapse of the ground such as the sloping ground and the flat ground, the following various construction methods have been proposed so far.

[0003] Rock fall protection net work; As shown in FIG.
An anchor 91 is provided on a slope such as a hillside, and a wire rope 92 is vertically and horizontally connected to the anchor 91.
A wire mesh 93 is stretched over the wire 2, and the wire mesh 93 covers and protects a falling rock or a landslide. As shown in FIG. 15, this rock fall protection net work can reduce rock fall from a height higher than the construction surface by using a part of the anchor 91 as a support 94 erected on the top of the inclined surface.
3 and may be of a pocket type.

Rope net method: As shown in FIG. 16, a wire rope 92 and a wire mesh 93 are stretched between these trees while using various trees and plantations on an inclined surface as they are. This is intended to prevent erosion of natural water and to leave natural slopes as they are.

In the rock fall protection net work described above, since it is necessary to make the wire rope 92 and the wire netting 93 along the slope or the unevenness of the ground, the wire diameter of these materials must be reduced. Therefore, a limit that can be received by the wire rope 92 and the wire mesh 93 naturally occurs, and the wire mesh 93 may be damaged depending on the size of the falling rock and the degree of collapse. The same is true for pocket rock fall protection netting.

On the other hand, in the above-mentioned rope net method, it is necessary to fit the wire rope 92 and the wire mesh 93 used for the rope net to the inclined surface and the unevenness of the ground, and in this case also, the wire diameter of the wire rope 92 and the like is reduced. And strength may be insufficient. In addition, since the wire mesh 93 must be stretched and the anchor 91 and the like must be driven while avoiding various trees and afforestation, the construction work itself becomes extremely difficult.

[0007] In order to compensate for the above-mentioned deficiencies in rock fall protection netting and rope net construction, a construction method called the following reinforced earth construction method or collapse prevention measure construction method has been developed.

[0008] Reinforcing earth method This method is to reinforce a frame formed by casting concrete on the ground such as an inclined surface, or to perform holding by a precast pressure plate. The frame and the pressure receiving plate are fixed on the ground by using a lock bolt and a ground anchor together to stabilize the ground such as an inclined surface.

As this reinforcing earth method, for example, Japanese Patent Application Laid-Open
“Simple slope stabilization method” proposed in Japanese Patent No. 279594 is representative. In this method, as shown in FIG. 17, "a drilled hole 2 is formed at an appropriate interval on the sloped ground. Both ends of the rustproof tensile material 1 are bent to form a plurality of ends of the tensile material 1. Part is inserted into one hole 2. The other end of each tensile member 1 is inserted into a separate hole 2, and the middle part is inserted into the hole 2.
・ Pass between 2 and follow the slope. A hardening material is injected into the hole 2 to fix the tensile material 1. The slope is held at the middle part of the tension member 1. A pressing member is interposed between the intermediate portion of the tensile member 1 and the slope, or a hardening material is sprayed. The tensile member 1 may be folded in half and inserted into the drill hole 2, and the reinforcing member or the tensile member may be passed through the bent portion near the surface of the ground, and may be bridged between the drill holes 2. "
"No formwork or troublesome rebar arrangement, no large-scale construction, no use of anchor heads or other members, and easy construction" (above, the front page of the above publication) ).

In the reinforced earth method shown in this example,
It is necessary to carry out construction on the target surface where collapse such as falling rocks is expected, and at that time vibrations and shocks are inevitably required, such as drilling work, etc. In addition to increasing cracks and the like, the work itself is dangerous.

[0011] In addition, in this reinforced earth method, since many rock bolts and ground anchors need to be cast, not only the construction period is lengthened, but also large-scale temporary work is required. There are also issues to be solved.

The inventors of the present invention have conducted various studies on how to improve the construction in protecting slopes and the like, and as a result, completed the present invention. It is.

[0013]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above-mentioned background, and the problem to be solved is to protect the ground such as sloping ground and the ground more easily and safely. And in a short period of time.

That is, first, an object of the invention according to claims 1 and 2 is that work involving vibration and impact such as anchoring can be reduced as much as possible, and temporary work is not required. It is an object of the present invention to provide a ground collapse prevention method capable of improving the safety of construction work, shortening the construction period, and reliably protecting the ground.

A third object of the present invention is to provide an apparatus capable of concretely and reliably performing the above-mentioned ground collapse prevention method of the first and second aspects. is there.

[0016]

Means for Solving the Problems In order to solve the above problems, first, means according to the first aspect of the present invention will be described by using reference numerals used in the description of the embodiments below. "A plurality of connection fulcrum members 10 are provided on the periphery of the target ground 40 where collapse is expected, such as a sloped ground or a ground, and a plurality of pressure receiving plates 2 are provided at appropriate positions on the target ground 40.
0, and each of the pressure receiving plates 20 or between each of the pressure receiving plates 20 and the connection fulcrum member 10 is connected by a plurality of connecting members 30, and these connecting members 30 are stretched vertically and horizontally on the target ground 40. The tension of each connecting member 30 is reduced by each pressure receiving plate 2
0 is a pressing force on the target ground 40 side to prevent the target ground 40 from collapsing.

That is, in the ground collapse prevention method according to the first aspect, as shown in FIGS. 1 to 3, a plurality of connecting fulcrum members 10 are formed or installed on the peripheral portion of the target ground 40, and A plurality of pressure receiving plates 20 are formed or installed in a portion of the inside of which it is necessary to prevent collapse (a portion surrounded by closed curves I to B in FIG. 1), and these pressure receiving plates 20 are formed.
The pressure receiving plate 20 and the connecting fulcrum member 10 are connected by the connecting material 30 as well as between the pressure receiving plates 20 so that the pressing force is applied to the pressure receiving plate 20.

As shown in FIGS. 4 and 5, each connection fulcrum member 10 is formed by casting connection concrete on a target ground 40, or a base 11 which is a precast product.
A lock bolt 12 and an anchor 13 for further fixing the base 11 on the target ground 40, and a connection frame 14 fixed to the base 11 by the anchor 13 and connected to a connection member 30 described later. It is.

The base 11 constituting the connecting fulcrum member 10 can be formed in various forms as exemplified in the embodiment, but one formed by casting fresh concrete is easy to receive. It is cheap and convenient. The installation location of the foundation 11 is important for exhibiting the effect of the ground collapsing prevention method, but can be set to some extent freely in relation to the installation location of the pressure receiving plate 20 described later.
In other words, the foundation 11 is not directly installed on the portion of the target ground 40 where the collapse must be prevented, i.e., as shown in FIG.
It is only necessary to install it in a place where the ground is solid and where it is safe for work, since it is sufficient to install it on the periphery of.

Of course, since these foundations 11 serve as "fulcrums" of the connecting members 30 described later, they are firmly fixed on the target ground 40 using the lock bolts 12 and the anchors 13 as described above. Is what is done. In addition to the lock bolts 12 and the anchors 13, reinforcement is provided by a reinforcing bar or the like in the foundation 11, or an H rope or the like is used or used in combination. In addition, these basics 11
The length of one side is about 2 m to 3 m, and it is suitable to install them at intervals of about 4 m, depending on the installation location.

The connecting member 30 must be connected to the base 11, but in the embodiment described later,
This embodiment uses a connection frame 14 fastened together by an anchor 13 on a foundation 11. This connecting frame 14 is used for connecting material 3
Since it is a portion that receives a direct force from zero, a metal material that has been subjected to a rust-proof treatment is suitable. Of course, the connection frame 14 is provided with a mounting hole for mounting an end of the connection member 30.

As shown in FIG. 1, each pressure receiving plate 20 is installed inside the target ground 40 in the area shown in FIGS.
As shown in FIG. 8, the unevenness adjusting unit 24 is located on the target ground 40.
The main body 21 is installed via the main body 21 and the like, and a connecting member joint 23 is connected to the main body 21 via an adjustment unit 22.

Although the main body 21 may be made of precast, it is usually constructed by placing ready-mixed concrete on the target ground 40, and the adjusting portion 22 is connected to the main body 21 by a connecting member described later. This is for connecting the joining portions 23, and various modes are conceivable as exemplified in the embodiments. The connecting member joint 23 connected to the main body 21 by the adjusting portion 22 is for connecting the connecting members 30 and has a configuration similar to the connecting frame 14 on the connecting fulcrum member 10 described above. It is.

Each connecting member 30 is made of a wire such as a steel wire or a wire rope. As shown in FIG. 9, the connecting member 30 is connected to the connecting frame 14 of the connecting fulcrum member 10 and the main body 21 of the pressure receiving plate 20. Of the crimp grip 31 or the nut 32 of
It is provided at each end. Further, as shown in FIG.
Wedge 3 between the end of the "0" and the nut 32 provided thereon.
In some cases, the connection to the connection fulcrum member 10 and the pressure receiving plate 20 side may be made with the intermediary of 3.

The connection member 30 is connected to the connection fulcrum member 10 and the pressure receiving plate 20 side, and the tension is applied to each nut 3.
If the pressure is increased by the tightening of 2, the tension is converted into the pressing force of the main body 21 of each pressure receiving plate 20 against the target ground 40 as shown by the arrow in FIG. For this reason, the pressure on the target ground 40 on which each pressure receiving plate 20 is installed is pressed by the gravity of the pressure receiving plate 20 itself and the pressing force from each connecting member 30. It means that the collapse has been prevented.

Further, as shown in FIG.
Even if a collapse stress occurs on the side, as shown by the arrow in FIG. 11, this stress is canceled out by the above-described pressing force due to the tension of each connecting member 30 and the own weight of each pressure receiving plate 20. As a result, the collapse is prevented.

Therefore, according to the ground collapse prevention method of the first aspect, each connecting fulcrum member 10 can be installed in a place where the ground condition is stable and easy to construct. It can be installed by work without vibration or shock. Furthermore, since the connecting fulcrum member 10 and the pressure receiving plate 20 are connected by the respective connecting members 30, the pressing force of each pressure receiving plate 20 onto the target ground 40 can be further increased. For this reason, according to this ground collapse prevention method, work involving vibrations and impacts such as anchoring can be reduced as much as possible, and temporary work can be made unnecessary, and the safety of the work is improved. At the same time, the construction period can be shortened, and the ground can be protected reliably.

In order to solve the above-mentioned problem, the means adopted in the invention according to claim 2 is that the method for preventing ground collapse according to claim 1 is described as “the pressure receiving plate 20 or the connection fulcrum member of each connection member 30. 10 is performed while changing the tension generated in each connecting member 30 ".

That is, in the ground collapse prevention method according to the second aspect, for example, the crimping grip 3 shown in FIG.
The tension of each connecting member 30 can be changed by using one or a nut 32, or by using an elastic member as the adjusting portion 22 constituting each pressure receiving plate 20. Things.

Therefore, according to the ground collapse prevention method of the second aspect, the tension can be always applied to each connecting member 30 by the elasticity of the adjusting portion 22 of the pressure receiving plate 20 or the crimping grip 31 can be provided. By performing the tightening, the tension of each connecting member 30 can be increased, and the maintenance work after construction can be simplified.

A third aspect of the present invention provides a device 100 for preventing collapse of a target ground 40 where a collapse is expected, such as a slope or a mountain, A plurality of connecting fulcrum members 10 provided on a peripheral portion surrounding the ground 40, a plurality of pressure receiving plates 20 installed on the target ground 40, and between the pressure receiving plates 20 or between the pressure receiving plates 2;
Connecting member 3 for connecting between the fulcrum member 0 and the connecting fulcrum member 10
0 is a ground collapse prevention device 100 ".

That is, the ground collapsing prevention device 100 according to claim 3 is used when the ground collapsing prevention method according to claim 1 or 2 is specifically carried out. The connecting fulcrum member 10 and the pressure receiving plate 20 to be installed, and a connecting member 30 for connecting between them.
It is composed of

Each component of the ground collapsing prevention device 100 has been described in the above ground collapsing prevention device 100, and therefore the description thereof is omitted. However, these components are conveyed as they are to the target ground 40 side. By assembling, the collapse prevention of the target ground 40 is performed as described above.

[0034]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of a first embodiment of the present invention; Therefore, the following description will focus on this embodiment.

FIG. 1 shows a state after the ground collapsing prevention device 100 according to the present invention has been installed on a target ground 40. As shown in FIGS. It is a highly uneven part. That is, the target ground 40 shown in FIGS. 1 to 3 indicates a ground with mountainous portions.

The ground collapse prevention device 100 installed here
Uses a large number of connecting fulcrum members 10 and pressure receiving plates 20 and a large number of connecting members 30 for connecting them, and the number of these constituent members depends on the area of the target ground 40 and the situation. Needless to say, it can be changed according to (the degree of scatter of locations where collapse prevention is performed). In particular, on the target ground 40 shown in FIG. 1, it is not necessary to prevent the entire surface from collapsing, and the portion surrounded by the closed curves a to c in FIG. It is.

Therefore, with respect to the target ground 40 shown in FIG. 1, the peripheral portion surrounding the area shown in FIGS.
The connecting fulcrum member 10 shown in FIG. 4 and FIG. 5 is installed.
A connecting member 30 which is provided with the pressure receiving plate 20 and connected thereto.
Are positions suitable for connection. In other words, as a place where the connecting fulcrum member 10 is installed, for example, a place that is on an extension of each connecting member 30 shown in FIG. Is installed. Of course, ease of work can also be a condition for the selection.

As shown in FIGS. 4 and 5, each of these connecting fulcrum members 10 is a base 11 formed or installed on a target ground 40, and a lock for fixing the base 11 to the target ground 40. It is composed of a bolt 12 and an anchor 13 and an anchor 13 fixed on the foundation 11 by, for example, the anchor 13.

The foundation 11 may be formed directly on the target ground 40 by a conventional method of producing a concrete structure using a spray mortar and concrete, ready-mixed concrete, reinforcing steel, or the like. It may be a precast product. The base 11 can also be formed of, for example, foamed urethane containing long glass fibers. In this case, the base 11 is lightweight, has excellent workability, has excellent corrosion resistance and weather resistance, and has excellent durability. It can be good.

The lock bolt 12 and the anchor 13 are employed in this type of civil engineering work.
The usage pattern is determined according to the situation on the target ground 40. Of course, these lock bolts 12 and anchors 13
In addition to the above, a steel frame such as an H class may be used in combination. When using these lock bolts 12 and anchors 13, it is preferable to reduce drilling work as much as possible.

In the connection fulcrum member 10 of the present embodiment, as shown in FIG.
3, the connecting frame 14 is attached. The connecting frame 14 may be fixed by any means as long as the connecting frame 14 is fixed to the foundation 11.
Since the connecting member 30 is connected to the connecting frame 14, mounting holes and the like suitable for the connecting member 30 are formed. Since the connecting frame 14 transmits the tension received from the connecting member 30 to the target ground 40 via the foundation 11, the connecting frame 14 may have a circular shape as shown in FIG. To effectively distribute the tension.

On the other hand, as shown in FIGS. 6 to 8, the pressure receiving plate 20 installed in the areas A to C on the target ground 40 is installed on the target ground 40 via the non-adjustment section 24 and the like. And a connecting member joining portion 23 connected to the body portion 21 via an adjusting portion 22. The pressure receiving plate 20 has a side of 50c in a plane form.
m to about 120 cm, and the target ground 40 is spaced at an interval of about 4 m similarly to the connection fulcrum member 10 described above.
It is installed on top.

The main body 21 constituting the pressure receiving plate 20
Although a precast product may be used in the same manner as the base 11 of the connecting fulcrum member 10 described above, in the present embodiment, the precast product is installed on the target ground 40 by a conventional method of casting ready-mixed concrete. Of course, this body 21
May also be formed using spray mortar, concrete, reinforcing steel, or the like, or may be formed using a synthetic resin material such as foamed urethane containing long glass fibers.

As shown in FIG. 8 and the like, the main body 21 in this embodiment is installed on the target ground 40 via the unevenness adjusting section 24. The unevenness adjusting section 24 ensures that the main body 21 abuts on the target ground 40, that is, “irroughness”.
This is used to eliminate the raised part called spraying concrete, and specifically uses shotcrete at a stage before hardening. The unevenness adjusting section 24 made of the shotcrete is suitable for construction on an inclined land as shown in FIG. In addition, as a material for forming the irregularity adjusting portion 24, a ready-mixed concrete, a foamed plastic material, a rubber material, and the like can be considered.

The adjusting section 22 is used for connecting the connecting member joining section 23 to the main body section 21. In addition, the adjusting section 22 adjusts the height of unevenness on the target ground 40, and constructs the target ground 40. The adjustment is performed in accordance with the later loosening, or the adjustment for following the decrease in the tension due to the elongation of the connecting member 30 or the like. In the present embodiment, the adjustment unit 22
Is constituted by an elongated threaded rod and a nut screwed to the threaded rod, and the above-described adjustments can be performed by adjusting the amount of screwing of the nut to the rope. Things.

The adjusting portion 22 may be made of an elastic member or material such as a spring or a rubber or plastic foam, and may be a jack using hydraulic pressure or the like. be able to.

The connecting member joining portion 23 connected to the main body portion 21 via the adjusting portion 22 is limited to a rectangular one as shown in FIG. 4, similarly to the connecting frame 14 on the connecting fulcrum member 10 side. Instead, it may be implemented as a polygonal shape or a ring shape. The connecting material joint 23 is made of a metal material subjected to a rustproofing process, but may be made of a synthetic resin mixed with long glass fibers.

The connecting member 30 connected to the pressure receiving plate 20 and the connecting fulcrum member 10 is made of PC steel stranded wire, and has crimp grips 31 at both ends as shown in FIG. Alternatively, a nut 32 is provided. The pressure receiving plate 20 and the connecting fulcrum member 10 of the connecting member 30
In order for the connection to the side to be sufficient, the pressure plate 2
It is preferable to provide a recess in which the nut 32 can be fitted in the connecting frame 14 on the 0 side or the connecting material joint 23 on the connecting fulcrum member 10 side.

Further, as shown in FIG. 9B, a wedge 33 may be interposed between the nut 32 and the connecting member 30 in order to strengthen the nut 32 from falling off. In addition, what is called a wire rope, a steel wire, etc. can also be used as this connection material 30.

FIG. 12 shows a cut-away slope on which the ground collapsing prevention method and the ground collapsing prevention device 100 according to the present invention are applied. In this case, along the inside of the cutting line of the mountain, FIG. A large number of connecting fulcrum members 10 are installed, and the pressure receiving plate 20 is installed on a straight line connecting the connecting fulcrum members 10. The construction in this case is to shift downward from the upper side in order, and to cut the lower side while stabilizing the inclined surface formed sequentially from the upper side.

FIG. 13 shows a method for preventing ground collapse and a device 10 for preventing ground collapse according to the present invention on an inclined surface beside a road.
In this case, no crack or collapse is caused on the concrete wall surface other than the connection fulcrum member 10 and the pressure receiving plate 20.

[0052]

As described in detail above, first, in the invention according to claim 1, as exemplified in the above embodiment,
"A plurality of connecting fulcrum members 10 are provided on the periphery of the target ground 40 where the collapse is predicted, such as a sloped land or a mountain, and a plurality of pressure receiving plates 20 are installed at appropriate positions on the target ground 40, and each pressure receiving plate 20 is provided. A plurality of connecting members 30 are connected between the plates 20 or between each pressure receiving plate 20 and the connecting fulcrum member 10, and these connecting members 30 are stretched vertically and horizontally on a target ground 40, The tension of the connecting member 30 is converted into a pressing force of each pressure receiving plate 20 on the target ground 40 side, and the target ground 40
To prevent the collapse of "
As a result, work involving vibration and impact such as anchoring can be reduced as much as possible, and temporary work can be eliminated, and the safety of the work is improved and the construction period is shortened. Thus, it is possible to provide a ground collapse prevention method capable of reliably protecting the ground.

That is, according to the ground collapse prevention method of the first aspect, the following effects can be obtained.

Unlike the conventional reinforced civil engineering method, it is not necessary to directly install a large number of anchors on the ground where collapse is expected, so that not only can the construction work be performed safely,
The construction cost can be reduced and the construction period can be shortened.

Since the number of anchors is not increased, the number of temporary works can be extremely reduced, so that not only the work can be facilitated but also the work period can be shortened.

Even if the target ground 40 becomes loose,
It is sufficient to increase the tension by strengthening the connection state of each connection member 30 to the connection fulcrum member 10 and the pressure receiving plate 20, and it is not necessary to respond to the strength change of the ground each time. It can be done easily.

Conversely, by observing the looseness of the connecting members 30 in the construction line, it is possible to predict the collapse of the target ground 40 and to ensure safety.

According to the method for preventing ground collapse according to claim 1, "the connection of each connecting member 30 to each pressure receiving plate 20 or each connecting fulcrum member 10 is performed while changing the tension generated in each connecting member 30. Claim 2 "
According to the ground collapsing prevention method according to the present invention, in addition to the same effects as described above, not only maintenance can be easily performed, but also stable tension is always applied to each connecting member 30 without human intervention. Because it can be added, it can be maintenance-free for a long time.

Further, according to the third aspect of the present invention,
"A device 100 for preventing collapse of a target ground 40 where a collapse is predicted, such as a sloping land or a mountain,
A plurality of connecting fulcrum members 10 provided on a peripheral portion surrounding
And a plurality of pressure receiving plates 20 installed on the target ground 40,
And a connecting member 30 for connecting between the pressure receiving plates 20 or between the pressure receiving plate 20 and the connection fulcrum member 10 ".
It is possible to provide an apparatus capable of reliably performing the ground collapse prevention method according to the first and second aspects.

[Brief description of the drawings]

FIG. 1 is a plan view of a target ground 40 in a state where a ground collapse prevention method and a ground collapse prevention device 100 according to the present invention are constructed.

FIG. 2 is a cross-sectional view taken along line 1-1 in FIG.

FIG. 3 is a longitudinal sectional view of FIG.

FIG. 4 is a plan view of a connecting fulcrum member constituting the ground collapse prevention device.

FIG. 5 is a longitudinal sectional view of the same.

FIG. 6 is a plan view of a pressure receiving plate constituting the ground collapsing prevention device.

FIG. 7 is a plan view in which a plurality of connecting members are connected to the pressure receiving plate.

FIG. 8 is a longitudinal sectional view of the pressure receiving plate.

FIG. 9 is an enlarged view of the end of the connecting member.
(A) is a partially enlarged plan view showing a state in which a crimping grip and a nut are attached, and (B) is a partially enlarged plan view showing a state in which a wedge is further attached thereto.

FIG. 10 is a longitudinal sectional view showing a state of generation of a force immediately after construction of the pressure receiving plate.

FIG. 11 is a longitudinal sectional view showing a state of generation of a force when the target ground starts loosening after construction of the pressure receiving plate.

FIG. 12 is a front view showing another construction example of the present invention and showing a horizontal inclined surface of a cut-through.

FIG. 13 shows still another construction example of the present invention.
It is a front view showing the slope beside the road.

FIG. 14 is a front view illustrating a conventional rock fall protection net work.

FIG. 15 is a partial cross-sectional view showing, on an enlarged scale, a line 2-2 in FIG. 14;

FIG. 16 is a front view showing a conventional rope net method.

FIG. 17 is a partial plan view showing another conventional collapse prevention method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 Ground-fall prevention device 10 Connection fulcrum member 11 Foundation 12 Lock bolt 13 Anchor 14 Connection frame 20 Pressure receiving plate 21 Main unit 22 Adjustment unit 23 Connection material joint 24 Non-land adjustment unit 30 Connection material 31 Crimp grip 32 Nut 33 Wedge 40 Ground

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayuki Ishikawa 3-55, Kawamacho, Ogaki-shi, Gifu F-term in Ibiden Green Tech Co., Ltd. (reference) 2D044 DB01

Claims (3)

[Claims] 1. A plurality of connection fulcrum members are provided at a peripheral portion surrounding a target ground where a collapse is predicted, such as a sloped ground or a ground, and a plurality of pressure receiving plates are installed at appropriate positions on the target ground. A plurality of connecting members are connected between each pressure receiving plate or between each pressure receiving plate and the connecting fulcrum member, and these connecting members are stretched vertically and horizontally on the target ground, and the tension of each of the connecting members is adjusted. Is converted into a pressing force of each of the pressure receiving plates on the target ground side to prevent the target ground from collapsing. 2. The connection of each connecting member to each pressure receiving plate or each connecting fulcrum member is performed while changing a tension generated in each connecting member.
Ground collapse prevention method described in 1. 3. A device for preventing collapse of a target ground where a collapse is predicted, such as a slope or a ground, wherein a plurality of connection fulcrum members provided on a peripheral portion surrounding the target ground; A plurality of pressure plates installed on the ground,
A ground collapsing prevention device, comprising a connecting member for connecting between the pressure receiving plates or between the pressure receiving plate and the connection fulcrum member.