JP7260768B2 - Slope reinforcement structure and slope reinforcement method - Google Patents

Description

The present invention relates to a slope reinforcement structure and a slope reinforcement method.

In recent years, slope disasters due to ground collapse are increasing as secondary disasters such as large-scale earthquakes and torrential rains. When an external force of the same magnitude acts on a slope that includes an area where a particular slope disaster is a concern, there is a “moving layer” that collapses due to the action of the external force, and an “immovable layer” that does not collapse due to the external force. ” is included.

For example, as shown in FIG. 1, a slope 1 including a region where there is concern about a slope disaster (hereinafter referred to as a “reinforcement target region 10”) has a slip surface A in the ground, and the ground level is higher than the slip surface A. The shallow side is the soil mass 11 as the moving layer, and the deeper side than the slip surface A is the stable ground 20 as the immovable layer. That is, in normal times, the slope 1 maintains its stability due to the internal friction between the soil mass 11 and the stable ground 20, but when an external force acts on the slope 1 due to the occurrence of a disaster or the like, the soil mass 11 on the stable ground 20 will move. The slope 1 collapses by sliding down along the slip surface A.

Various ground stabilization structures and ground reinforcement structures have been proposed as countermeasures against such ground collapse.

For example, in Patent Document 1, the heads of anchors arranged in a plurality of rows from the upper part to the lower part of the slope are connected with a head connecting member, and a bearing plate is attached to each anchor. As a slope stabilization construction method, a construction method is disclosed in which anchors are installed even in the area on the upper side of the slope beyond the area where there is a risk of slope failure.

In addition, Patent Document 2 discloses a method for constructing a large-diameter bending tensile reinforcement body for the purpose of ground reinforcement on a cut slope, in which a cylindrical core material is penetrated into a column-shaped improved body to bend the reinforcement body. A method for increasing the resistance and shear resistance and improving the reinforcement effect of the soil is disclosed.

Furthermore, Patent Document 3 discloses a slope stabilization structure in which piles are driven into the natural ground to stabilize the slope, and a plurality of piles having different driving angles with respect to the slip surface are driven into the slope. , discloses a structure in which the pile heads of the plurality of piles are rigidly connected.

JP-A-2002-88769 JP-A-7-42159 JP 2017-128921 A

By the way, the collapse modes of the slope 1 as shown in FIG. There are two types of "progressive destruction" in which the collapse of the soil mass 11 progresses gradually from the beginning.

The slip failure is caused by an excessive external force acting on the slope 1 due to, for example, a large-scale earthquake. That is, the balance of the internal friction is lost due to the action of an excessive external force, and as a result, the lump of earth 11 slides down along the slip surface A.

On the other hand, the progressive destruction is caused by a large amount of rainwater becoming groundwater and permeating the slope 1 due to, for example, heavy rain, and the water level in the slope 1 rises. That is, first, rainwater permeates into the lower part 10a of the soil mass 11 forming the reinforcement target area 10 due to the rise in the water level, which reduces the strength of the lower part 10a and causes local collapse. Subsequently, the local collapse causes the resistance (bearing force of the soil mass 11) in the lower portion 10a of the reinforcement target area 10 to be lost, and the upper portion of the locally collapsed portion collapses. In this way, the collapse progresses gradually upward in the region 10 to be reinforced.

Here, in the above-mentioned Patent Documents 1 to 3, although ground stabilization and ground reinforcement were performed as countermeasures against the slip failure, countermeasures against the progressive failure were not considered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a slope reinforcement structure capable of obtaining an appropriate slope reinforcement effect regardless of the failure mode of the slope.

The present invention for solving the above problems is a slope reinforcing structure in which a reinforcing structure having a plurality of reinforcing members is inserted into a slope, wherein the reinforcing structure is a hollow bar having a plurality of water permeable holes formed on its peripheral surface. A first reinforcing member composed of a material, at least one end of which is inserted into the toe of the slope , which is the initial collapse site of the progressive fracture, and a bar material, which is higher than the insertion position of the first reinforcing member on the slope a second reinforcing member having one end inserted into a position; and a connecting member connecting the other end of the first reinforcing member to the other end of the second reinforcing member, wherein the first reinforcing member is substantially horizontal. Alternatively, the second reinforcing member is installed such that the other end is positioned lower than the one end, and the installation angle of the inclined surface of the second reinforcing member with respect to the sliding surface is at least greater than the installation angle of the first reinforcing member.

According to the present invention, since the first reinforcing member, one end of which is inserted so that the other end is substantially horizontal or positioned lower than the one end, is composed of a steel pipe, it is possible to properly drain the ground. In addition, since the installation angles of the first reinforcing member and the second reinforcing member whose ends are connected by the connecting member are different from each other, the tensile resistance and bending resistance of the reinforcing structure can be increased, and various collapses can be achieved. A slope reinforcement effect can be obtained that can appropriately correspond to the mode.

A plurality of other reinforcing members may be connected to one reinforcing member.

It is preferable that the first reinforcing member and the second reinforcing member are arranged in a staggered manner on the slope.

A plurality of the reinforcing structures may be provided on the slope.

A second connecting member that connects the plurality of reinforcing structures may be further provided. In such a case, the second connecting member connects the first reinforcing member of one reinforcing structure and the second reinforcing member of another reinforcing structure.

The plurality of reinforcing structures may be arranged in a zigzag pattern on the slope.
Alternatively, the plurality of reinforcing structures may be arranged side by side along the toe of the slope. At this time, it is preferable to further include another second reinforcing member whose one end is inserted at a position higher than the insertion position of the second reinforcing member on the slope and which is connected to the first reinforcing member. The second reinforcing member and the other second reinforcing member may be arranged in a zigzag pattern on the slope.

The reinforcing structure may further include a third reinforcing member made of a bar material and connected to at least the first reinforcing member or the second reinforcing member by the connecting member. In this case, it is preferable that the installation angle of the inclined surface of the third reinforcing member with respect to the sliding surface is set larger than the installation angle of the first reinforcing member and smaller than the installation angle of the second reinforcing member.

A rigid connection member may be further provided for rigidly connecting at least the first reinforcing member or the second reinforcing member and the third reinforcing member.

It is preferable that the first reinforcing member inserted into the trailing edge of the slope is provided with a bearing plate. At this time, the bearing pressure plate may penetrate into the first reinforcing member so as to be substantially perpendicular to the sliding surface.

An installation angle of the second reinforcing member may be substantially perpendicular to the sliding surface.

The first reinforcing member mainly functions as a tensile resistance member, and the second reinforcing member mainly functions as a bending resistance member.

A rigid connection member may be further provided for rigidly connecting the other end of the first reinforcing member and the other end of the second reinforcing member.

A prestress may be introduced to the connecting member that connects one of the reinforcing members and another of the reinforcing members.

According to another aspect of the present invention, there is provided a slope reinforcement method for inserting a reinforcing structure having a plurality of reinforcing members into a slope, the first method comprising a hollow bar having a plurality of permeable holes formed in the peripheral surface thereof. One end of the reinforcing member is inserted at least at the toe of the slope , which is the initial collapse site of the progressive failure, so that the other end is substantially horizontal or lower than the one end, and the first reinforcing member is inserted on the slope. one end of a second reinforcing member made of a bar is inserted at a higher position than the first reinforcing member so that the setting angle with respect to the sliding surface of the slope is at least greater than the setting angle of the first reinforcing member; It is characterized by connecting the other end of the member and the other end of the second reinforcing member.

A plurality of other reinforcing members may be connected to one reinforcing member.

It is preferable that the first reinforcing member and the second reinforcing member are arranged in a staggered manner on the slope.

A plurality of reinforcing structures may be provided on the slope.

Among the plurality of reinforcing structures, the first reinforcing member of one of the reinforcing structures and the second reinforcing member of the other reinforcing structure may be connected by a second connecting member.

A plurality of reinforcing structures may be arranged in a zigzag pattern on the slope.
Alternatively, a plurality of reinforcing structures may be arranged side by side along the toe of the slope. At this time, one end of another second reinforcing member connected to the first reinforcing member is inserted at a position higher than the insertion position of the second reinforcing member on the slope, and the second reinforcing member and the other second reinforcing member are inserted. 2 The reinforcing members may be arranged in a zigzag pattern on the slope.

A third reinforcing member made of a rod material and connected to at least the first reinforcing member or the second reinforcing member by the connecting member is set at an angle larger than the installation angle of the first reinforcing member and the angle of the second reinforcing member. It may be installed on the sliding surface of the slope at an installation angle smaller than the installation angle.

At least the first reinforcing member or the second reinforcing member and the third reinforcing member may be rigidly connected by a rigidly connecting member.

A bearing plate may be provided at the other end of the first reinforcing member inserted at the bottom of the slope . At this time , the bearing pressure plate may be inserted into the first reinforcing member so as to be substantially perpendicular to the sliding surface.

The second reinforcing member may be installed substantially perpendicular to the sliding surface.

The first reinforcing member may function primarily as a tensile resistance member and the second reinforcing member may function primarily as a bending resistance member.

The other end of the first reinforcing member and the other end of the second reinforcing member may be rigidly connected by a rigid connection member.

A prestress may be introduced to the connecting member that connects one of the reinforcing members and another of the reinforcing members.

According to the present invention, it is possible to provide a slope reinforcement structure capable of obtaining an appropriate slope reinforcement effect regardless of the slope failure mode, and particularly capable of obtaining a suitable slope reinforcement effect against progressive failure. can.

FIG. 3 is an explanatory diagram schematically showing the ground including slopes that may collapse. FIG. 4 is a conceptual diagram showing the relationship between the stress generated by a slope failure and the amount of displacement of a mass of soil. It is a perspective view which shows typically the structure of the slope reinforcement structure concerning 1st Embodiment. It is (a) sectional drawing and (b) front view of the slope reinforcement structure shown in FIG. FIG. 4 is an explanatory diagram of passive earth pressure that a reinforcing structure receives; It is (a) sectional drawing and (b) front view which show typically the structure of the slope reinforcement structure concerning 2nd Embodiment. FIG. 7 is a perspective view of the slope reinforcement structure shown in FIG. 6; It is (a) sectional drawing and (b) front view which show typically other structures of the slope reinforcement structure concerning 2nd Embodiment. It is (a) sectional drawing and (b) front view which show typically other structures of the slope reinforcement structure concerning 2nd Embodiment. It is (a) sectional drawing and (b) front view which show typically other structures of the slope reinforcement structure concerning 2nd Embodiment. It is (a) sectional drawing and (b) front view which show typically the structure of the slope reinforcement structure concerning 3rd Embodiment. It is (a) sectional drawing and (b) front view which show typically other structures of the slope reinforcement structure concerning 2nd Embodiment. It is (a) sectional drawing and (b) front view which show typically the structure of the slope reinforcement structure concerning 4th Embodiment. It is (a) sectional drawing and (b) front view which show typically other structures of the slope reinforcement structure concerning 4th Embodiment. It is (a) sectional drawing and (b) front view which show typically the structure of the slope reinforcement structure concerning 5th Embodiment. It is (a) sectional drawing and (b) front view which show typically other structures of the slope reinforcement structure concerning 5th Embodiment. It is (a) sectional drawing and (b) front view which show typically other structures of the slope reinforcement structure concerning 5th Embodiment. It is (a) sectional drawing and (b) front view which show typically other structures of the slope reinforcement structure concerning 5th Embodiment. It is (a) sectional drawing and (b) front view which show typically other structures of the slope reinforcement structure concerning 5th Embodiment. It is (a) sectional drawing and (b) front view which show typically other structures of the slope reinforcement structure concerning 5th Embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.

In the following description, "slope 1" is a generic term for soil structures including slopes, such as natural slopes found in mountains and hills, and artificial slopes (slopes) found in embankments, for example. )including.

FIG. 2(a) is an explanatory diagram of the stress generated by the collapse of the slope 1, and FIG. 2(b) is a conceptual diagram showing the relationship between the displacement amount δ of the soil mass 11 with respect to the slip surface A and the reinforcement effect. . As shown in FIG. 2(a), when the soil mass 11 slides down along the slip surface A and collapses, tensile stress T and bending stress M mainly act on the reinforcing members for reinforcing the reinforcement target region 10. do. The reinforcing effect of the reinforcing member for each of the tensile stress T and the bending stress M may be referred to as "tensile reinforcing effect" and "bending reinforcing effect" in the following description. As shown in FIG. 2(b), when the amount of displacement .delta. of the lump 11 with respect to the slip surface A is small, the tensile reinforcing effect mainly works, and when the amount of displacement .delta. is large, the bending reinforcing effect mainly works.

FIG. 2(c) is an explanatory diagram of the installation angle of the reinforcing member. In the following description, as shown in FIG. The angle positive in the direction of rotation toward the surface side (counterclockwise direction in FIG. 2(c)) may be referred to as the "installation angle θ" of the reinforcing member.

(First embodiment)
First, the slope reinforcement structure according to the first embodiment will be described. FIG. 3 is a perspective view schematically showing the configuration of the reinforcing structure 100 according to this embodiment. 4A and 4B are explanatory views schematically showing the configuration of the reinforcing structure 100 according to the present embodiment, FIG. 4A being a cross-sectional view along the line BB in FIG. be. In the following description, in order to clarify the positional relationship, the X-axis direction, Y-axis direction, and Z-axis direction which are orthogonal to each other are defined, and the positive X-axis direction is the horizontal direction from the stable ground 20 to the mass of soil 11. , the positive direction of the Y-axis is the horizontal direction extending along the slope surface, and the positive direction of the Z-axis is the vertically upward direction. In FIG. 4A, which is a cross-sectional view, a first reinforcing member 101 and a second reinforcing member 102, which will be described later, should be illustrated by dotted lines, but are illustrated by solid lines to avoid complication of the illustration.

As shown in FIGS. 3 and 4, the reinforcing structure 100 includes a first reinforcing member 101, a second reinforcing member 102, and a head portion 101a of the first reinforcing member 101 (the first reinforcing member 101 protruding from the soil mass 11). It has a connecting member 103 that connects the head portion 102a of the second reinforcing member 102 (the end portion of the second reinforcing member 102 that protrudes from the lump 11). A tensile member, for example, is used as the connecting member 103 .

The first reinforcing member 101 is composed of a rod-like member, and in order to facilitate drainage of groundwater that has penetrated into the slope 1, particularly into the region 10 to be reinforced, is at least approximately horizontal, or the head 101a is more horizontal than horizontal. The other end side of the head 101a is inserted into the reinforcement target region 10 at a downward angle. The structure and material of the first reinforcement member 101 can be arbitrarily selected as long as the drainage in the reinforcement target region 10 can be appropriately performed. Specifically, the first reinforcing member 101 may be a hollow bar, such as a steel pipe, and may be constructed such that groundwater can be drained through the hollow portion of the steel pipe.

Also, the first reinforcing member 101 is installed in the reinforcement target region 10 so as to mainly obtain a tensile reinforcing effect. In such a case, it is known from past knowledge that the tensile reinforcing effect is efficiently exhibited when the installation angle of the reinforcing member is 0° to 45°. Therefore, the first reinforcing member 101 is preferably inserted into the region to be reinforced 10 so that the installation angle θ1 is in the range of 0° to 45°, more preferably 30°.

From the above point of view, when the installation angle θ1 is, for example, 30°, the first reinforcing member 101 can be inserted at least approximately horizontally or at a position where the head 101a is at an angle lower than the horizontal. desirable.

The second reinforcing member 102 is constructed from any bar-like member, such as a rod, pipe, rectangle or H-beam.

Also, the second reinforcing member 102 is installed in the reinforcement target region 10 so as to mainly obtain a bending reinforcing effect. In such a case, it is known from past knowledge that the bending reinforcing effect is efficiently exhibited when the reinforcing member is substantially perpendicular to the slip surface, that is, when the installation angle is approximately 90°. That is, the second reinforcing member 102 exhibits a bending reinforcing effect more efficiently than at least the first reinforcing member 101 by setting the installation angle θ2 to be at least larger than the installation angle θ1 (for example, 30°). can be made Then, the second reinforcing member 102 may be inserted into the reinforcement target region 10 so that the installation angle θ2 is 90°.

As shown in FIG. 5 , the passive earth pressure P of the slope 1 acts on the portion (embedded portion) of the second reinforcing member 102 inserted into the slope 1 . Therefore, it is preferable to consider the influence of the passive earth pressure P when determining the installation angle θ2 of the second reinforcing member 102 . That is, for example, the installation angle θ2 is set so that the installation angle θ2 calculated based on the bending reinforcement effect by inserting the second reinforcing member 102 and the passive earth pressure P is substantially perpendicular to the slip surface. As a result, the passive earth pressure P applied to the embedding portion of the second reinforcing member 102 is increased, and as a result, the bending reinforcing effect can be efficiently exhibited. Note that the passive earth pressure P varies depending on, for example, the length of insertion of the second reinforcing member 102 into the slope 1 .

From the above point of view, it is preferable that the installation angle θ2 of the second reinforcing member 102 is larger than the installation angle θ1 of the first reinforcing member 101 and set to 90° or less. In such a case, it is desirable that the installation angle θ2 in consideration of the passive earth pressure P is approximately vertical, that is, approximately 90°.

In addition, the first reinforcing member 101 and the second reinforcing member 102 are inserted into the region 10 to be reinforced 10 to a depth such that the insertion side end reaches the stable ground 20 via the soil mass 11 in order to properly exhibit the slope reinforcement effect. It is cast on the slope 1 with a

The connecting member 103 connects the head portion 101a of the first reinforcing member 101 and the head portion 102a of the second reinforcing member 102, and is made of wire-shaped, rod-shaped, or sheet-shaped steel or other metal or resin. It is a member that

The connecting member 103 connects the head portion 101a of the first reinforcing member 101 and the head portion 102a of the second reinforcing member 102 as described above, so that, for example, the tensile stress generated in the first reinforcing member 101 is reduced to at least It is transmitted to the connected second reinforcing member 102 .

(Slope reinforcement effect by reinforcement structure)
According to the reinforcing structure 100 configured as described above, it is possible to obtain an appropriate reinforcing effect regardless of the collapse mode of the slope.

For example, since the first reinforcement member 101 is inserted into the reinforcement target region 10 at least approximately horizontally or at an angle where the head portion 101a is lower than the horizontal, groundwater in the slope 1 can be properly drained. As a result, the infiltration of groundwater into the lower portion 10a of the reinforcement target region 10 is suppressed, and the reduction in strength of the lower portion 10a can be suppressed, so that the occurrence of the progressive fracture can be suppressed.

Further, a water permeation hole (not shown) or a drain hole (not shown) may be formed through the steel pipe in the thickness direction on the peripheral surface of the first reinforcing member 101 . By forming the water permeation holes and the drainage holes in this way, the groundwater in the slope 1 can be properly introduced into the steel pipe and drained more properly. That is, it is possible to more appropriately suppress the occurrence of the progressive fracture.

It is preferable that the head portion 101a of the first reinforcing member 101 protrude near the lower portion 10a of the reinforcement target region 10, more specifically, to the lowermost side of the lump 11 as the moving bed. As a result, the slope strength of the lower portion 10a of the reinforcement target region 10 is improved, and the occurrence of the progressive fracture can be more appropriately suppressed.

For example, according to the reinforcement structure 100 according to the present embodiment, the first reinforcement member 101 is installed in the reinforcement target region 10 so that the installation angle is, for example, 30°, so that the tensile reinforcement effect can be preferably exhibited. can be done. Also, the installation angle θ2 of the second reinforcing member 102 is set to be at least larger than the installation angle θ1 of the first reinforcing member 101 and at least smaller than 90°. By setting the installation angle .theta.2 larger than the installation angle .theta.1 in this manner, the bending reinforcing effect can be favorably exhibited as compared with at least the first reinforcing member 101. FIG. In addition, by inserting into the reinforcement target region 10 so that the installation angle θ2 is 90° or less, the bending reinforcement effect can be favorably exhibited in consideration of the passive earth pressure P.

That is, according to the present embodiment, the tensile reinforcing effect of the first reinforcing member 101 and the bending reinforcing effect of the second reinforcing member 102 are shared and appropriately exhibited, thereby improving the redundancy of the reinforcing structure 100. can be done. As a result, the reinforcement structure 100 according to the present embodiment can appropriately exhibit the slope reinforcement effect regardless of the magnitude of the displacement amount δ of the soil mass 11 with respect to the slip surface A, and appropriately suppress the occurrence of the slip failure. can do.

For example, according to the present embodiment, by connecting the head portion 101a of the first reinforcing member 101 and the head portion 102a of the second reinforcing member 102 by the connecting member 103, the slope reinforcing effect of the second reinforcing member 102 is particularly high. can be suitably exhibited.

As shown in FIG. 2, as the stress generated by the collapse of the slope 1, the tensile stress T is generated even when the displacement amount δ of the soil mass 11 with respect to the slip surface A is small, whereas the bending stress M is generated by the displacement amount δ does not occur when is small. That is, the first reinforcing member 101 can exhibit the tensile reinforcing effect even when the displacement δ is small, whereas the second reinforcing member 102 preferably exhibits the bending reinforcing effect unless the displacement δ becomes large. I can't let you. In such a case, for example, in the progressive fracture, although the tensile stress T is generated in the slope 1, the bending stress M generated is small because the displacement amount δ as the soil mass 11 is small, and the slope reinforcement effect by the second reinforcing member 102 cannot be properly exhibited.

Here, according to the present embodiment, by connecting the head portion 101a of the first reinforcing member 101 and the head portion 102a of the second reinforcing member 102 with the connecting member 103, for example, the collapse of the slope 1 is progressed. Part of the tensile stress T acting on the first reinforcing member 101 is transmitted to the second reinforcing member 102 even in the case of failure or in the initial stage of occurrence of sliding failure and the amount of displacement δ of the soil mass 11 is small. and can be borne as a bending stress M. In other words, the slope reinforcement effect of the second reinforcing member 102 can be favorably exhibited regardless of the collapse mode of the slope.

In the present embodiment, the head portion 101a of the first reinforcing member 101 and the head portion 102a of the second reinforcing member 102 are connected by the connecting member 103, which is a tensile member, but this is the method for connecting the reinforcing members. Not limited. For example, instead of the connecting member 103, which is a tensile member, a stiffening member (not shown) may be used to rigidly connect the reinforcing members. As a result, it becomes possible to transmit the force in the compression direction between the first reinforcing member 101 and the second reinforcing member 102, and the slope reinforcing effect can be exhibited more favorably.

In addition to the connecting member 103 that connects the first reinforcing member 101 and the second reinforcing member 102, the rigid connection member includes the head portion 101a of the first reinforcing member 101 and the second reinforcing member 102. It may be provided between the heads 102a. Thus, by providing each of the connection member 103 and the rigid connection member, even if a slope failure occurs in a collapse mode in which the second reinforcement member 102 acts before the first reinforcement member 101, for example, force can be transmitted to the first reinforcing member 101 to improve the slope reinforcing effect.

For example, a prestress in the tensile direction or the bending direction may be applied to the connecting member 103 or rigid connection member (not shown) that has completed the connection between the reinforcing members. By introducing prestress to the connecting member 103 and the rigid connection member in this way, the tensile reinforcing effect and the bending reinforcing effect of the reinforcing structure 100 can be improved. Along with this, it becomes possible to transmit stress between the connected reinforcing members from a stage where the amount of displacement δ of the lump of earth 11 is small.

3 and 4B, for example, for one second reinforcing member 102, a plurality of (two in the example of the present embodiment) first reinforcing members are connected by a connecting member 103. 101 are preferably connected. Thus, by increasing the number of connections between the first reinforcing members 101 and the second reinforcing members 102, the redundancy of the reinforcing structure 100 can be improved, and the slope reinforcing effect can be further improved.

Further, when a plurality of reinforcing members are installed on the slope in this way, the positional relationship of the respective reinforcing members is staggered, that is, as shown in FIG. It is desirable that the positions 102 are arranged so that they do not overlap in the Z-axis direction in the YZ plane. By installing the reinforcing members in a staggered manner in this manner, the intervals between the reinforcing members in the falling direction of the lump of earth 11 are narrowed, and the lump of earth 11 is prevented from slipping through the reinforcing members and collapsing. can be done.

(Second embodiment)
The reinforcing structure 100 needs to reinforce the moving layer so that the soil mass 11 as the moving layer does not slide down, that is, the reinforcement target area 10 does not collapse.

Therefore, in the slope reinforcement structure according to the second embodiment, as shown in FIGS. 6 and 7 , a plurality of reinforcement structures 100 are installed in the reinforcement target region 10 . That is, the reinforcing structures 100 are arranged side by side in the Y-axis direction on the side of the lower part 10a of the reinforcement target area 10 in order to appropriately suppress the soil mass 11 from sliding down due to the collapse of the reinforcement target area 10 .

By arranging the reinforcing structures 100 side by side in the Y-axis direction at least on the side of the lower portion 10a of the reinforcement target region 10 in this way, the sliding down of the earth mass 11 can be received over the entire length in the horizontal direction along the slope. , the collapse of the reinforcement target region 10 can be appropriately suppressed.

As shown in FIG. 8, by connecting the first reinforcing member 101 of one reinforcing structure 100 and the second reinforcing member 102 of the other reinforcing structure 100 with a connecting member 103, continuous reinforcement can be achieved. You may comprise so that a member may be installed. That is, a plurality of first reinforcing members 101 and second reinforcing members 102 may be alternately arranged in a zigzag pattern along the Y-axis direction on the lower portion 10a side of the region 10 to be reinforced to form the reinforcing structure 200. good. With such a configuration, the stress generated on the slope 1 can be distributed and received by a larger number of reinforcing members, thereby more appropriately suppressing the lump of earth 11 from sliding down.

Further, when installing a plurality of reinforcing structures 100 on the slope 1, as shown in FIG. may be provided. By installing the reinforcement structure 100 also above the slope 1 in this way, the entire reinforcement target region 10 can be reinforced, and the collapse of the slope 1 can be suppressed more appropriately.

In addition, when a plurality of reinforcing structures 100 are respectively provided in the vertical direction of the slope in this way, the plurality of reinforcing structures 100 are arranged in a zigzag manner as shown in FIG. 9(b). is desirable.

Further, at this time, the first reinforcing member 101 of the reinforcing structure 100 provided above and the second reinforcing member 102 of the other reinforcing structure 100 provided below are connected by the second connecting member 105, The stress generated on the slope 1 can be appropriately distributed to each reinforcing structure 100, and the slope reinforcement effect can be further improved.

Incidentally, as a matter of course, as shown in FIG. 10, the reinforcing structure 200 may be provided in each of the vertical directions of the slope.

(Third embodiment)
As described in the second embodiment, by providing the reinforcing structure 100 or the reinforcing structure 200 respectively in the vertical direction of the slope, the entire region of the soil mass 11 that becomes the moving layer is reinforced, and the collapse of the slope 1 is suppressed. can do. It should be noted that there is no need to provide a plurality of reinforcing structures on the slope 1 if the entire region of the mass of soil 11 that becomes the moving layer can be reinforced.

FIG. 11 is an explanatory diagram schematically showing the configuration of the reinforcing structure 300 according to the third embodiment. As shown in FIG. 11 , according to the reinforcing structure 300, as in the first and second embodiments, the first reinforcing member 101 provided on the Z-axis direction negative side of the reinforcement target region 10 and the reinforcement target region 10 and a second reinforcing member 102 provided on the positive side in the Z-axis direction are connected by a connecting member 103 . That is, according to the present embodiment, the entire area to be reinforced 10 can be reinforced by changing the insertion position of the second reinforcing member 102 without providing a plurality of reinforcing structures 100 . In this case, the installation position of the second reinforcing member 102 is such that the installation angle θ2 considering the passive earth pressure P is set to be substantially vertical, and the insertion side end of the second reinforcing member 102 is aligned with the first reinforcing member 101. It is preferably set so as to be positioned near the insertion side end. In this case, it is more preferable that the first reinforcing member 101 and the second reinforcing member 102 are arranged so as to intersect each other in the slope 1 in cross-sectional view.

In order to reinforce the entire reinforcement target region 10, for example, as shown in FIG. 12, in addition to the reinforcing structure 200 provided below the slope, a second reinforcing member 102 is provided above the slope. good too. In such a case, the newly inserted second reinforcing members 102 are preferably arranged in a zigzag manner with the second reinforcing members 102 forming the reinforcing structure 200 . Furthermore, it is preferable that the newly inserted second reinforcing members 102 are respectively connected to the reinforcing structures 200 by second connecting members 105, for example.

(Fourth embodiment)
According to the above first to third embodiments, the reinforcing structure mainly exhibits the head portion 101a of the first reinforcing member 101 installed to mainly exhibit the tensile reinforcing effect and the bending reinforcing effect. Although the head portion 102a of the second reinforcing member 102 installed for the purpose is connected by the connecting member 103, the structure of the reinforcing structure is not limited to this.

FIG. 13 is an explanatory diagram schematically showing the configuration of a reinforcing structure 400 according to the fourth embodiment. The reinforcing structure 400 is configured by connecting a third reinforcing member 104 with a connecting member 103 in addition to the first reinforcing member 101 and the second reinforcing member 102 .

Specifically, the third reinforcing member 104 further reduces the tensile stress and the bending stress generated on the slope 1 so that the reinforcing structure 400 can exhibit both the tensile reinforcing effect and the bending reinforcing effect more preferably. It is installed in the area 10 to be reinforced so that it can be distributed appropriately. In this case, the installation angle θ3 of the third reinforcing member 104 is desirably set so that θ1<θ3<θ2.

Also, the third reinforcing member 104 is preferably arranged in a staggered manner with the first reinforcing member 101 and the second reinforcing member 102 .

Thus, by configuring the reinforcing structure 400 including the third reinforcing member 104, the slope reinforcing effect can be further appropriately improved.

Note that the method of installing the third reinforcing member 104 is not limited to the above embodiment. For example, as shown in FIG. 14, instead of the reinforcing structure 200 provided above the slope shown in FIG. A body 500 may be placed.

That is, when the region to be reinforced 10 collapses, the tensile stress T acts most on the lower portion 10a of the region to be reinforced 10, so the first reinforcing member 101 is provided at least on the lower portion 10a of the region to be reinforced 10. It can exert a tensile reinforcing effect. Therefore, by replacing the first reinforcing member 101 of the reinforcing structure 200 provided above the slope with the third reinforcing member 104, the tensile stress T and the bending stress M generated above the slope due to the collapse of the slope 1 can be appropriately reduced. In other words, the tensile reinforcement effect and the bending reinforcement effect can be exhibited, and the slope reinforcement effect can be appropriately improved.

The third reinforcing member 104 is rigidly connected to the first reinforcing member 101 and the second reinforcing member 102 by rigidly connecting members (not shown) instead of or in addition to the connecting member 103. good too.

(Fifth embodiment)
Note that the reinforcing structures 100, 200, 300, 400, and 500 shown in the above first to fourth may be provided with a bearing plate 106 as shown in FIG.

The pressure plate 106 is made of, for example, a plate-like member, and has a penetration hole (not shown) extending from the surface of the pressure plate 106 in the thickness direction. Then, for example, the first reinforcing member 101 constituting each reinforcing structure is penetrated into the penetration hole, and the surface portion is installed in the reinforcement target region 10 along the surface of the slope 1 .

In this way, by providing the bearing plate 106 to the reinforcing structure, it is possible to receive the soil mass 11 that is about to slide down due to a slope failure, prevent it from sliding down, and suppress the collapse of the reinforcement target area 10. In addition, especially by providing the bearing plate 106 at the lower portion 10a of the reinforcement target region 10, which is the initial collapse portion of the progressive fracture, the initial collapse of the reinforcement target region 10 can be appropriately received, so the progressive fracture can be appropriately suppressed.

In addition, as described above, the bearing plate 106 suppresses the collapse by receiving the earth mass 11 that slides down due to the slope failure with the surface portion. Therefore, the bearing plate 106 is at least the first reinforcing member of the reinforcing structure provided on the side of the lower portion 10a of the reinforcement target region 10 (the Z-axis direction negative direction side) (the reinforcing structure provided on the most negative side in the Z-axis direction). If the first reinforcing member 101 is penetrated, collapse of the reinforcement target region 10 can be suppressed, but naturally all the first reinforcing members 101 provided on the slope 1 may be penetrated.

The installation method of the pressure plate 106 is not limited to installation along the surface of the slope 1 . For example, as shown in FIG. 16, the bearing plate 106 may be inserted into the first reinforcing member 101 so as to be substantially perpendicular to the slip plane A. As shown in FIG.

By providing the bearing plate 106 in this way, the surface portion becomes substantially perpendicular to the sliding direction of the soil mass 11 that slides down due to the collapse of the reinforcement target region 10, so that the collapse of the reinforcement target region 10 is suppressed more appropriately. be able to.

When the bearing plate 106 is installed substantially perpendicular to the slip surface A in this way, the bearing plate 106 is installed after removing the clod 11 in the vicinity of the installation location. , the slope reinforcement effect of the bearing plate 106 can be exhibited properly whether or not the installation location of the bearing plate 106 is backfilled.

It should be noted that, as described above, the bearing plate 106 can penetrate any reinforcing member of the reinforcing structures 100, 200, 300, 400, 500 as illustrated in FIGS. 17-20.

Although the embodiments of the present invention have been described above, the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive various modifications or modifications within the scope of the technical idea described in the claims, and these are also within the technical scope of the present invention. be understood to belong to

For example, the reinforcing structure disclosed in the present invention can be suitably applied to embankments and the like as artificial slopes. In such a case, the reinforcing structure is provided on the slope of the embankment, and particularly by installing the first reinforcing member provided at the bottom of the reinforcing structure at the toe of the slope, it is possible to enjoy a particularly appropriate slope reinforcement effect. can.

INDUSTRIAL APPLICABILITY The present invention is useful for reinforcing slopes that are likely to collapse, and is particularly useful for reinforcing artificial slopes such as embankments.

Reference Signs List 1 slope 10 area to be reinforced 10a lower part 11 earth mass 20 stable ground 100 reinforcing structure 101 first reinforcing member 102 second reinforcing member 103 connecting member 104 third reinforcing member 105 second connecting member 106 pressure plate 200 reinforcing structure 300 reinforcing structure Body 400 Reinforcement structure 500 Reinforcement structure A Slip surface M Bending stress T Tensile stress θ1 Installation angle (first reinforcing member)
θ2 Installation angle (second reinforcing member)
θ3 Installation angle (third reinforcing member)

Claims (32)

A slope reinforcement structure in which a reinforcement structure including a plurality of reinforcement members is inserted into a slope,
The reinforcing structure is
a first reinforcing member composed of a hollow bar material having a plurality of water permeable holes formed on its peripheral surface, and having one end inserted into at least the toe of the slope, which is the initial collapse site of the progressive fracture;
a second reinforcing member made of a bar and having one end inserted at a position higher than the insertion position of the first reinforcing member on the slope;
a connecting member that connects the other end of the first reinforcing member and the other end of the second reinforcing member,
The first reinforcing member is installed so that it is substantially horizontal or the other end is lower than the one end,
The slope reinforcement structure, wherein the installation angle of the slope of the second reinforcement member with respect to the sliding surface is at least greater than the installation angle of the first reinforcement member. 2. The slope reinforcement structure according to claim 1, wherein said first reinforcement member inserted at the bottom of the slope is provided with a bearing plate. 3. The slope reinforcement structure according to claim 2, wherein the bearing pressure plate is inserted into the first reinforcement member so as to be substantially perpendicular to the sliding surface. The slope reinforcement structure according to any one of claims 1 to 3, wherein a plurality of other reinforcing members are connected to one reinforcing member. 5. The slope reinforcing structure according to claim 4, wherein the first reinforcing member and the second reinforcing member are arranged in a staggered manner on the slope. The slope reinforcement structure according to any one of claims 1 to 5, characterized in that a plurality of said reinforcement structures are provided on the slope. Further comprising a second connecting member that connects the plurality of reinforcing structures,
The slope according to claim 6, wherein the second connecting member connects the first reinforcing member of one reinforcing structure and the second reinforcing member of another reinforcing structure. reinforced structure. The slope reinforcement structure according to claim 6 or 7, wherein a plurality of said reinforcement structures are arranged side by side along the toe of the slope. Further comprising another second reinforcing member having one end inserted at a position higher than the insertion position of the second reinforcing member on the slope and connected to the first reinforcing member,
9. The slope reinforcement structure according to claim 8, wherein said second reinforcement member and said another second reinforcement member are arranged in a zigzag manner on the slope. The slope reinforcement structure according to any one of claims 6 to 8, characterized in that a plurality of said reinforcement structures are arranged in a zigzag pattern on the slope. The slope reinforcement structure according to any one of claims 1 to 10, wherein the installation angle of the second reinforcement member is substantially perpendicular to the slip surface. The first reinforcing member mainly functions as a tensile resistance member,
The slope reinforcement structure according to any one of claims 1 to 11, wherein the second reinforcement member mainly functions as a bending resistance member. The slope reinforcement according to any one of claims 1 to 12, further comprising a rigid connection member for rigidly connecting the other end of the first reinforcing member and the other end of the second reinforcing member, respectively. structure. The reinforcing structure is
Further comprising a third reinforcing member composed of a bar material and connected to at least the first reinforcing member or the second reinforcing member by the connecting member,
The installation angle of the slope of the third reinforcing member with respect to the sliding surface is larger than the installation angle of the first reinforcement member and smaller than the installation angle of the second reinforcement member. The slope reinforcement structure according to any one of claims 1 to 3. 15. The slope reinforcement structure according to claim 14, further comprising a stiffening member for rigidly coupling at least the first reinforcing member or the second reinforcing member and the third reinforcing member, respectively. The slope reinforcement structure according to any one of claims 1 to 15, characterized in that a prestress is introduced to the connecting member that connects one of the reinforcing members and another of the reinforcing members. A slope reinforcement method for inserting a reinforcing structure having a plurality of reinforcing members into a slope,
One end of the first reinforcing member composed of a hollow bar with a plurality of water permeable holes formed on the peripheral surface is placed at least horizontally at the toe of the slope, which is the initial collapse site of the progressive fracture, or the other end is from one end. so that the
One end of a second reinforcing member made of a bar is placed at a position higher than the insertion position of the first reinforcing member on the slope so that the setting angle with respect to the sliding surface of the slope is at least greater than the setting angle of the first reinforcing member. Insert so that it becomes larger,
A slope reinforcement method, characterized in that the other end of the first reinforcing member and the other end of the second reinforcing member are connected to each other. 18. The slope reinforcement method according to claim 17 , wherein a bearing plate is provided at the other end of said first reinforcing member inserted at the bottom of the slope. 19. The slope reinforcement method according to claim 18, wherein the bearing pressure plate is inserted into the first reinforcement member so as to be substantially perpendicular to the sliding surface. The slope reinforcement method according to any one of claims 17 to 19, wherein a plurality of other reinforcing members are connected to one reinforcing member. 21. The slope reinforcement method according to claim 20, wherein the first reinforcing member and the second reinforcing member are arranged in a staggered manner on the slope. The slope reinforcement method according to any one of claims 17 to 21, characterized in that a plurality of said reinforcing structures are provided on the slope. wherein the first reinforcing member of one of the plurality of reinforcing structures and the second reinforcing member of the other reinforcing structure are connected by a second connecting member; Item 23. A slope reinforcement method according to Item 22. 24. The method of reinforcing a slope according to claim 22 or 23, wherein a plurality of said reinforcing structures are arranged along the toe of the slope. inserting one end of another second reinforcing member connected to the first reinforcing member at a position higher than the insertion position of the second reinforcing member on the slope;
25. The slope reinforcement method according to claim 24, wherein the second reinforcing member and the other second reinforcing member are arranged in a zigzag manner on the slope. The slope reinforcement method according to any one of claims 22 to 24, characterized in that a plurality of said reinforcing structures are arranged in a zigzag pattern on the slope. The slope reinforcement method according to any one of claims 17 to 26, characterized in that the second reinforcement member is installed substantially perpendicular to the slip surface. The first reinforcing member mainly functions as a tensile resistance member,
A slope reinforcement method according to any one of claims 17 to 27, characterized in that said second reinforcement member mainly functions as a bending resistance member. The slope reinforcement method according to any one of claims 17 to 28, wherein the other end of the first reinforcing member and the other end of the second reinforcing member are rigidly connected by a rigid connection member. a third reinforcing member composed of a bar and connected to at least the first reinforcing member or the second reinforcing member;
Any one of claims 17 to 29, characterized in that it is installed on the sliding surface of the slope at an installation angle that is larger than the installation angle of the first reinforcing member and smaller than the installation angle of the second reinforcing member. The slope reinforcement method described in . 31. The slope reinforcement method according to claim 30, wherein at least said first reinforcing member or said second reinforcing member and said third reinforcing member are rigidly connected by a rigidly connecting member. The slope reinforcement method according to any one of claims 17 to 31, characterized in that prestress is introduced into a member connecting one of the reinforcing members and another of the reinforcing members.

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