JP2015055076A - Support structure, and method for constructing support pillar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support structure which reduces impact during a collision from a predetermined direction efficiently.SOLUTION: In a support structure used for a sand arrestation dam, a landslide suppression pile, a protective fence for a vehicle, and the like, a support pillar is configured by a protection plate for protecting intrusion or collision from a predetermined direction and a vertical plate installed so as to be unified with the protection plate and so as to have a T-shaped horizontal cross section. The vertical plate has a plurality of through-holes drilled at predetermined intervals, arrangement, or combination thereof. The support pillar is constructed by using concrete so as to include at least the through-holes, and insertion members are inserted into the through-holes. The support pillar can efficiently reduce impact of collision received from a predetermined direction by making not only the concrete but also the insertion members take charge of stress.

Description

  The present invention relates to a strut structure and a strut construction method.

  For example, in Patent Document 1, a slit-type sabo dam provided by installing a plurality of wall members at intervals in a crossing direction of a river, and the wall member has a wide upstream width when seen in a plan view. The slit-type sabo dam is characterized in that the downstream width is narrow, the interval between adjacent wall members is narrow on the upstream side, and wide on the downstream side.

  Further, for example, in Patent Document 2, a cylindrical reinforcing material is integrated with an inner peripheral surface of a hollow steel pipe, and an uneven portion continuous in the circumferential direction is formed on the inner peripheral surface of the reinforcing material. It is disclosed as a reinforcing structure for a load bearing material.

JP 2002-146753 A JP 2002-363923 A

  According to the present invention, an object of the present invention is to provide a support structure that can efficiently reduce an impact at the time of a collision from a predetermined direction.

  The support structure according to the present invention is a support structure used to reduce an impact at the time of a collision from a predetermined direction, and has a T-shaped horizontal cross section, and is formed in the support structure. It has a plurality of through holes and a reinforcing member that reinforces the compressive force applied to the column, and the reinforcing member is disposed so as to surround at least a part of the column.

  Preferably, the support column is composed of a plate-shaped metal member, and is composed of a defense plate installed so as to face the direction in which it collides, and a plate-shaped metal member. A plurality of the through holes formed in the thickness direction of the vertical plate by a predetermined interval, arrangement, or a combination thereof, and the reinforcing member is provided on the vertical plate. It arrange | positions so that at least one part may be surrounded and it may enter into the said through-hole.

  Preferably, it further has an insertion member inserted into the through hole, and the reinforcing member is made of concrete and is placed so as to surround a state where the insertion member is inserted into the through hole.

  The strut construction method according to the present invention includes a step of inserting a part or all of a strut having a T-shaped horizontal cross section into a predetermined hole, and at least a part around the strut inserted into the predetermined hole. And placing concrete so as to surround.

  According to the present invention, it is possible to efficiently reduce an impact at the time of a collision from a predetermined direction.

It is an outline | summary of the sabo dam 1 which concerns on Embodiment 1. FIG. It is a figure explaining the sand barrier 2 which concerns on Embodiment 1. FIG. It is a figure which illustrates typically the state which suppresses a debris flow etc. by the sand barrier 2 which concerns on Embodiment 1. FIG. It is an outline | summary which installs the suppression pile 20 which concerns on Embodiment 2. FIG. It is a figure explaining the suppression pile 20 which concerns on Embodiment 2. FIG. It is a figure which illustrates typically the state which suppresses a landslide by the suppression pile 20 concerning Embodiment 2. FIG. It is a figure explaining the modification (a)-(d) which concerns on Embodiment 1. FIG. It is a figure explaining the modification (e)-(f) which concerns on Embodiment 1. FIG. It is a figure explaining the modification concerning Embodiment 2. FIG. It is a figure explaining the modification of the construction method which concerns on Embodiment 2. FIG.

  Hereinafter, the configuration of an embodiment of the present invention will be described with reference to the drawings. However, the scope of the present invention is not limited to the illustrated examples.

[Example 1]
First, the first embodiment will be described.
FIG. 1 is an outline of the sabo dam 1 according to the first embodiment.
As illustrated in FIG. 1, the sabo dam 1 is installed with a sabo wall 2 in the river width direction (crossing direction of the river). Specifically, the sabo dam 1 is installed in the river width direction with a predetermined interval between the sabo walls 2. The sabo dam 1 functions as a sabo dam by installing at least one sabo wall 2.
The sabo wall 2 is installed, for example, to suppress debris flow (Yamatsunami) that occurs when sediments accumulated in the river or collapsed debris is pushed away by increasing the amount of water flowing into the river due to heavy rain. The By installing the sand barrier 2 with a predetermined interval (slit), it is possible to flow water, gravel, trees or the like appropriately from upstream to downstream without blocking the river. The sabo dam 1 of the first embodiment will be described as an example in which two sabo walls 2 are provided in the river width direction with a predetermined interval.
The sabo wall 2 has a column 5 that forms a T-shaped horizontal cross section, and is reinforced by a reinforcing member so as to withstand the stress generated in the sabo wall 2 when debris flow or the like is suppressed. In order to suppress debris flow and the like, the sabo wall 2 is installed with a wall surface (protection plate 4) for suppressing the debris flow facing the upstream side of the river.
The structure of the support 5 is suitable for the sand barrier 2 against a collision or impact in the direction of the defense plate 4 and the vertical plate 6 in contact with the defense plate 4.

FIG. 2 is a view for explaining the sand barrier 2 according to the first embodiment.
As illustrated in FIG. 2, the sand barrier 2 includes a column 5, a base plate 8, concrete 10, a through hole 12, and a cross member 14.

FIG. 2A is a perspective view of the sand barrier 2.
FIG. 2B is a diagram illustrating a cross section A of the sand barrier 2 illustrated in FIG.
The support | pillar 5 is an example of the support | pillar which concerns on this invention.
As illustrated in FIG. 2A and FIG. 2B, the support column 5 includes a defense plate 4 and a vertical plate 6. The support column 5 is installed so that the defense plate 4 and the vertical plate 6 are integrated so that the horizontal section has a T-shape. Specifically, the support column 5 is configured such that the flat surface portion of the defense plate 4 and the end surface portion of the vertical plate 6 are bonded so that the horizontal cross section has a T-shape. At this time, it is preferable that the vertical plate 6 is installed so that the end surface portion is substantially on the center line of the flat portion of the defense plate 4.
The support | pillar 5 does not limit the connection method of the defense board 4 and the vertical board 6, For example, when it is a metal member, it is connected by bolting, welding, etc.

The defense plate 4 is an example of a defense plate according to the present invention.
The defense plate 4 has a wall surface for preventing debris and trees swept away from the upstream of the river. The defense plate 4 has a surface in contact with the vertical plate 6 on the back surface of the wall surface.
The defense plate 4 is made of, for example, a metal member, and specifically made of iron, steel, or stainless steel. Further, the defense plate 4 is configured in a plate shape. The material and shape of the defense plate 4 are not limited to this, and can be appropriately changed according to the application.

The vertical plate 6 is an example of a vertical plate according to the present invention.
The vertical plate 6 is installed on the surface on the back side of the wall surface for preventing debris and trees swept away from the upstream of the river of the defense plate 4 so that the horizontal cross section of the support column 5 has a T shape. The vertical plate 6 is composed of, for example, a metal member, specifically, iron, steel, or stainless steel, like the defense plate 4. The vertical plate 6 is configured in a plate shape having a predetermined plate thickness. Further, the vertical plate 6 is configured to contact not only the defense plate 4 but also the base plate 8. The vertical plate 6 supports the defense plate 4 so as not to fall down downstream when debris flow or the like is suppressed. Further, the vertical plate 6 functions to share the load received by the defense plate 4. If the vertical plate 6 has a shape and thickness capable of withstanding an impact, the shape and thickness can be appropriately changed.

FIG.2 (c) is a figure which shows B cross section of the sand barrier 2 illustrated to Fig.2 (a).
As illustrated in FIG. 2C, the vertical plate 6 has a through hole 12 formed in a flat portion.
The through hole 12 is an example of a through hole according to the present invention.
A plurality of through holes 12 are formed in the support column 5. Specifically, a plurality of through holes 12 are formed in the plane of the vertical plate 6. The through hole 12 is filled with the concrete 10 so as to enter the hole. The through hole 12 in the first embodiment will be described assuming that the hole has a circular shape. The through-hole 12 can change the shape of a hole, the diameter of a hole, the number of holes, and the drilling direction of a hole suitably. Moreover, the through-hole 12 can change suitably the space | interval of a hole-to-hole, the arrangement space | interval (arrangement) of a row of holes, or these combinations based on design strength.

As illustrated in FIGS. 2A and 2C, the base plate 8 is installed in contact with the defense plate 4 and the vertical plate 6. The base plate 8 is made of, for example, a metal member, and specifically made of iron, steel, or stainless steel. The base plate 8 is configured in a plate shape.
The base plate 8 serves as a basis for mounting the defense plate 4 and the vertical plate 6 and functions to share a load received from the vertical plate 6. Further, the base plate 8 can be attached to the installation surface with a bolt or the like when an attachment hole (not shown) for attachment to the installation surface is provided. The base plate 8 can be appropriately changed in shape, size, and plate thickness.
The base plate 8 can also be removed. When the base plate 8 is removed, a part or all of the support columns 5 may be inserted into a hole drilled in the installation surface, and may be driven by the concrete 10.

The concrete 10 is an example of a reinforcing member according to the present invention.
The concrete 10 is obtained by solidifying aggregate (sand, gravel, etc.), water or the like with cement. In the first embodiment, the concrete 10 is described as using cement concrete. Concrete 10 includes high-strength concrete whose strength is increased by mixing admixtures, pre-stressed concrete (PC) pre-stressed, and fiber reinforced concrete (FRC) that is a composite of synthetic resin, steel fiber, and the like. ) May be appropriately selected and used.
The concrete 10 is characterized by being strong against compressive force and weak against tensile force. The concrete 10 is disposed so as to surround at least a part of the column 5. Specifically, the concrete 10 is disposed so as to surround at least a part of the vertical plate 6 and enter a plurality of through holes 12 formed in the vertical plate 6. The concrete 10 includes a through-hole 12 drilled in the vertical plate 6, and by being constructed so as to be in contact with each other, the stress applied to the vertical plate 6 can be shared with the concrete 10, and the compression force and tensile force of the sand barrier 2 And durability against shearing force can be enhanced. In addition, when the cross member 14 is inserted into the through hole 12, the concrete 10 is placed so as to surround the state in which the cross member 14 is inserted into the through hole 12.
Further, as illustrated in FIGS. 2A and 2B, when the concrete 10 is placed on the column 5, the concrete 10 is directed from the defense plate 4 to the vertical plate 6 in contact with the defense plate 4. Thus, it is preferable that the concrete 10 and the protection plate 4 are separated from each other by a predetermined amount so that the predetermined amount of the vertical plate 6 is exposed.

FIG. 2D is a diagram schematically illustrating a state in which the cross member 14 is installed in the through hole 12.
As illustrated in FIG. 2D, in the sand barrier 2, the cross member 14 is inserted into the plurality of through holes 12 provided in the vertical plate 6. The cross member 14 functions to integrate the vertical plate 6 and the concrete 10 to increase the contact area and to prevent the displacement.
The cross member 14 is an example of an insertion member according to the present invention.
The cross member 14 is made of, for example, a metal member, and specifically made of iron, steel, or stainless steel. The cross member 14 may be a steel bar (for example, a shape steel, a steel bar, a wire, or a rail) or a pipe-like shape. The cross member 14 can be appropriately changed in diameter and length based on design conditions. Further, the cross member 14 may be separately installed on the wall surface of the vertical plate 6 without being inserted into the through hole 12.
When the cross member 14 is inserted into the through hole 12 and compared with the case where the cross member 14 is not inserted into the through hole 12, the case where the cross member 14 is inserted into the through hole 12 is, for example, about 6 with respect to shear force. It can be expected to obtain ˜8 times durability.

FIG. 3 is a diagram schematically illustrating a state in which a debris flow or the like is suppressed by the sand barrier 2 according to the first embodiment.
FIG. 3A is a diagram for explaining a state in which a debris flow or the like is suppressed by the sand barrier 2.
As illustrated in FIG. 3A, the sand barrier 2 receives a debris flow that flows from the upstream by the wall surface of the protection plate 4. The sand barrier 2 receives a load in the direction of water flow (from upstream to downstream) by inhibiting debris flow and the like.

FIG. 3B is a diagram for explaining the balance of forces acting on the sand barrier 2 when a load is applied.
Here, the direction of the force shown in FIG. 3B will be described by distinguishing between a clockwise direction (clockwise direction) and a counterclockwise direction (counterclockwise direction).
As illustrated in FIG. 3B, the sand barrier 2 is fixed and supported on a horizontal installation surface, for example, and thus applies vertical force (gravity) to the installation surface. Moreover, the sand barrier 2 receives a vertical repulsive force (vertical reaction force) from the installation surface. Therefore, the sabo wall 2 maintains a fixed state on the installation surface by maintaining a balance of force between the vertical reaction force received in the vertical direction and the gravity.
There, the sand barrier 2 receives a load in the flowing direction by suppressing debris flow and the like. Since the sand barrier 2 is fixed to the installation surface, it receives a force (horizontal reaction force) that repels the load from the installation surface in the horizontal direction. Also, the sand barrier 2 is subjected to a bending moment in the counterclockwise direction due to the received load, and a predetermined amount of bending deformation (deflection) occurs in the load direction. The sand barrier 2 does not rotate counterclockwise even when a bending moment in the counterclockwise direction acts. Because the sand barrier 2 is fixed to the installation surface, a clockwise bending moment acts as a repulsive force. The sand barrier 2 maintains a balance of force by receiving a bending moment in the clockwise direction from the installation surface, and does not rotate or move.

FIG. 3 (c) is a diagram for explaining the balance of moment forces focusing on the predetermined location of the sand barrier 2.
Here, the direction of the force shown in FIG. 3C will be described by distinguishing between a clockwise direction (clockwise direction) and a counterclockwise direction (counterclockwise direction).
As illustrated in FIG. 3C, when the sand barrier 2 receives a load, the sand barrier 2 receives a bending moment in the counterclockwise direction due to the load, and a bending moment in the clockwise direction that is a reaction force received from the installation surface. Works. In the sand barrier 2, a portion to be compressed and a portion to be pulled are generated by the action of these bending moments. In the sand barrier 2, a tensile force acts on the surface (the protective plate 4) that receives the load, and the surface opposite to the surface that receives the load (on the other end side of the end of the vertical plate 6 that contacts the protective plate 4). A compressive force acts on the concrete 10). The concrete 10 has a feature that it is strong against a compressive force and weak against a tensile force, and since it receives the compressive force, durability can be maintained. Moreover, since the defense plate 4 receives a tensile force, it is preferable to select a material strong against the tensile force.
Since the concrete 10 is constructed with a predetermined amount of space from the protection plate 4, the tensile force transmitted from the protection plate 4 can be prevented.

Moreover, as illustrated in FIG. 3B, the sand barrier 2 generates a shearing force therein by receiving a load. Specifically, the sand barrier 2 keeps a balance of force between the shear force in the direction in which the load is applied and the shear force in the opposite direction to the shear force, thereby preventing the occurrence of cutting or deviation. I keep it. The sand barrier 2 can improve the effect of preventing the occurrence of cutting or deviation against these shearing forces by the vertical plate 6 included in the support column 5. The vertical plate 6 is provided with a plurality of through holes 12, and by increasing the contact area by filling the through holes 12 with the concrete 10, it is possible to prevent cutting or slippage acting due to shear force. it can.
Further, as illustrated in FIG. 2D, the vertical plate 6 can improve durability against shearing force and displacement by inserting a cross member 14 into the through hole 12. Specifically, the vertical plate 6 increases the contact area with the concrete 10 to be constructed by inserting the cross member 14 into the through hole 12. The cross member 14 is transmitted with the load received by the defense plate 4 through the vertical plate 6. The cross member 14 receives a reaction force against the shearing force from the concrete 10 nearby due to the action of the shearing force generated by the transmitted load. Therefore, the vertical plate 6 can further improve the durability against the compressive force, tensile force, and shear force when the cross member 14 is inserted into the through hole 12.

  Thus, the sand barrier 2 can improve the durability of the sand barrier 2 by providing the through holes 12 in the support pillars 5. Moreover, the sand barrier 2 can further improve durability by inserting the through hole 12 cross member 14. In addition, the sabo dam 1 is economically preferable because it uses the concrete 10 and uses less metal members than the steel transmission sabo dam manufactured by combining steel pipes.

[Example 2]
Next, Embodiment 2 will be described.
FIG. 4 is a diagram for explaining the outline of installing the suppression pile 20 according to the second embodiment.
As illustrated in Fig. 4, the landslide loses the strength supported by a part of the land due to the influence of factors such as gravity, earthquake, rainfall, snowmelt, groundwater, or human development, and changes from high to low. It is a phenomenon of sliding down a slope. A geological structure in which a landslide is likely to occur is formed by a non-moving layer, a sliding surface, and a landslide mass in the order of lamination.
The immovable layer is a hard stratum such as a bedrock layer, for example. The slip surface includes, for example, sand or debris such as gravel, clay layer, sediment such as mudstone and volcanic ash. The landslide block is a weathered rock (a rock that has been scientifically altered by sunlight or wind and rain, such as sandstone, shale, granite, serpentinite, and limestone), boulder or gravel mixed earth or sand, or It is clay.
A landslide suppression pile 20 for preventing landslides is installed in these accumulated areas. The landslide prevention pile 20 is installed by inserting a part or the whole of the column into the hole. Specifically, the landslide suppression pile 20 is constructed by inserting the landslide suppression pile 20 into a hole that has been drilled in the vertical direction up to the immobile layer in advance and in close contact with the ground. Generally, the deterrent pile to be inserted is a steel pipe, H steel, or the like.
The suppression pile 20 according to the second embodiment includes a column 50 that forms a T-shaped horizontal cross section. The restraint pile 20 is reinforced with a reinforcing member so as to withstand the stress generated in the restraint pile 20 when landslide is restrained. The deterrent pile 20 is installed with the wall surface (protective plate 4) constituting the support column 50 directed in the direction in which the landslide occurs.
The structure of this support | pillar 50 is suitable for the suppression pile 20 with respect to the collision and the impact with respect to the direction of the defense board 4 and the vertical board 6 which touches the defense board 4. FIG.

FIG. 5 is a diagram for explaining the suppression pile 20 according to the second embodiment.
As illustrated in FIG. 5, the restraining pile 20 includes a column 50, a steel pipe 90, concrete 100, a through hole 120, and a cross member 140.

FIG. 5A is a perspective view of the suppression pile 20.
FIG.5 (b) is a figure which shows A cross section of the suppression pile 20 illustrated to Fig.5 (a).
The support | pillar 5 is an example of the support | pillar which concerns on this invention.
As illustrated in FIG. 5A and FIG. 5B, the support column 50 includes a defense plate 40 and a vertical plate 60. The support column 50 is installed so that the defense plate 40 and the vertical plate 60 are integrated so that the horizontal section has a T-shape. Specifically, the support column 50 is configured such that the flat surface portion of the defense plate 40 and the end surface portion of the vertical plate 60 are bonded so that the horizontal cross section has a T shape. At this time, it is preferable that the vertical plate 60 is installed so that the end surface portion is substantially on the center line of the flat portion of the defense plate 40.
The support | pillar 50 does not limit the connection method of the defense board 40 and the vertical board 60, for example, when it is a metal member, it is connected by bolting, welding, etc.

The defense plate 40 is an example of a defense plate according to the present invention.
The defense plate 40 has a wall surface directed toward the landslide direction in order to receive the landslide mass. It is comprised with the defense board 40, for example, a metal member, and is specifically comprised with iron, steel, or stainless steel. Further, the defense plate 40 is configured in a plate shape. The material and shape of the defense plate 40 are not limited to this, and can be appropriately changed according to the application.

The vertical plate 60 is an example of a vertical plate according to the present invention.
The vertical plate 60 is installed on the surface on the back side of the wall surface for preventing the landslide of the defense plate 40 so that the horizontal cross section of the support column 50 has a T shape. The vertical plate 60 is made of, for example, a metal member, specifically, iron, steel, or stainless steel, like the defense plate 40. The vertical plate 60 is configured in a plate shape having a predetermined plate thickness. Moreover, the vertical board 60 supports the defense board 40 so that it may not fall down downstream, when a landslide is suppressed. Further, the vertical plate 60 functions to share the load received by the defense plate 40. If the vertical plate 60 has a shape and thickness capable of withstanding an impact, the shape and thickness can be appropriately changed.

FIG.5 (c) is a figure which shows B cross section of the suppression pile 20 illustrated to Fig.5 (a).
As illustrated in FIG. 5C, the vertical plate 60 has a through hole 120 formed in a plane.
The through hole 120 is an example of a through hole according to the present invention.
A plurality of through holes 120 are formed in the support column 50. Specifically, a plurality of through holes 120 are formed in the plane of the vertical plate 60. The through hole 120 is filled with the concrete 100 so as to enter the hole. The through-hole 120 in Example 2 is described as a circular shape. The through-hole 120 can change the shape of a hole, the diameter of a hole, the number of holes, and the drilling direction of a hole suitably. Moreover, the through-hole 120 can change suitably the space | interval of a hole, the space | interval space | interval (arrangement) of a hole row | line | column, or these combination based on design strength.

The steel pipe 90 is made of, for example, a metal member, specifically, a rolled steel material for welded structure or a carbon steel material for general structure. The diameter and length of the steel pipe 90 can be changed as appropriate. The steel pipe 90 is not limited to a metal member, and may be a synthetic resin member or a paper member (for example, a void).
When the predetermined part of the concrete 100 is destroyed, the steel pipe 90 prevents scattering and dropping of fragments at the damaged part of the concrete 100. Furthermore, the steel pipe 90 can prevent the occurrence of local buckling by preventing scattering and dropping of fragments.

Concrete 100 is an example of a reinforcing member according to the present invention.
The concrete 100 is obtained by solidifying aggregates (sand, gravel, etc.), water, etc. with cement. In the second embodiment, description will be made assuming that cement concrete is used as in the first embodiment. Concrete 100 includes high-strength concrete whose strength is increased by mixing admixtures, pre-stressed concrete (PC) pre-stressed, and fiber reinforced concrete (FRC) that is a composite of synthetic resin, steel fiber, and the like. ) May be appropriately selected and used.
The concrete 100 is characterized by being strong against compressive force and weak against tensile force. The concrete 100 is poured into the steel pipe 90 into which the support 50 is inserted. The concrete 100 is disposed so as to surround at least a part of the column 50. Specifically, the concrete 100 is disposed so as to surround at least a part of the vertical plate 60 and enter through holes 120 formed in the vertical plate 60. The concrete 100 includes a through-hole 120 drilled in the vertical plate 60, and can be shared with the concrete 100 by being constructed so as to come into contact with each other. And durability against shearing force can be enhanced. Further, when the cross member 140 is inserted into the through hole 120, the concrete 100 is placed so as to surround the state in which the cross member 140 is inserted into the through hole 120.

FIG. 5D is a diagram schematically illustrating a state in which the cross member 140 is installed in the through hole 120.
The cross member 140 is an example of the insertion member according to the present invention.
As illustrated in FIG. 5D, in the restraining pile 200, the cross member 140 is inserted into the plurality of through holes 120 provided in the vertical plate 60.
The cross member 140 functions to integrate the vertical plate 60 and the concrete 100 to increase the contact area and to prevent the shift.
The cross member 140 is made of, for example, a metal member, and specifically made of iron, steel, or stainless steel. The cross member 140 may be a steel bar (for example, a steel bar, a steel bar, a wire, or a rail) or a pipe-like shape. The cross member 140 can be appropriately changed in diameter and length based on design conditions. Further, the cross member 140 may be separately installed on the wall surface of the vertical plate 60 without being inserted into the through hole 120.
When the cross member 140 is inserted into the through hole 120 and when it is not inserted into the through hole 120, the case where the cross member 140 is inserted into the through hole 120 is, for example, about 6 with respect to the shearing force. It can be expected to obtain ˜8 times durability.

FIG. 6 is a diagram schematically illustrating a state in which a landslide is suppressed by the suppression pile 20 according to the second embodiment.
FIG. 6A is a diagram illustrating a state in which a landslide is suppressed by the suppression pile 20.
As illustrated in FIG. 6A, the restraining pile 20 is inserted into a hole that is excavated so as to reach the fixed layer. The deterrent pile 20 is embedded so as to reach the immobile layer in order to fix the end. Since the edge part is being fixed to the immobility layer when the landslide arises in the area | region in which the suppression pile 20 is installed, it can suppress a landslide. The suppression pile 20 receives a load in the traveling direction of the landslide when the landslide is suppressed.

FIG. 6B is a diagram for explaining the balance of forces acting on the deterrent pile 20 when receiving a load. Here, the direction of force shown in FIG. 6B will be described by distinguishing between a clockwise direction (clockwise direction) and a counterclockwise direction (counterclockwise direction).
As illustrated in FIG. 6B, the restraint pile 20 is fixed and supported on the installation surface, for example, and thus applies a vertical force (gravity) to the installation surface. Moreover, the suppression pile 20 receives the repulsive force (vertical reaction force) of a perpendicular direction from an installation surface. Therefore, the restraint pile 20 is maintaining the state fixed to the installation surface by maintaining the balance of force with the vertical reaction force received in a perpendicular direction, and gravity.
The deterrent pile 20 receives a load in the flowing direction by deterring a landslide. Since the restraint pile 20 is fixed to the installation surface, it receives a force (horizontal reaction force) that repels the load in the horizontal direction from the installation surface. Further, the restraining pile 20 is subjected to a bending moment in the counterclockwise direction due to the received load, and a predetermined amount of bending deformation (deflection) occurs in the load direction. The restraint pile 20 does not rotate counterclockwise even when a counterclockwise bending moment acts. This is because the restraining pile 20 is fixed to the installation surface, and therefore a clockwise bending moment acts as a repulsive force. The restraint pile 20 maintains a balance of force by receiving a bending moment in the clockwise direction from the installation surface, and does not rotate or move.

FIG. 6C is a diagram for explaining the balance of moment forces focusing on the predetermined location of the restraint pile 20. Here, FIG. 6C illustrates the direction of the force shown in the same manner as FIG. 6B by distinguishing between a clockwise direction (clockwise direction) and a counterclockwise direction (counterclockwise direction). To do.
As illustrated in FIG. 6C, when the restraint pile 20 receives a load, a counterclockwise bending moment received by the load and a clockwise bending moment received from the installation surface act. The restraint pile 20 generates a portion to be compressed and a portion to be pulled by the action of these bending moments. The strut 50 has a tensile force acting on the defense plate 40 in the vicinity of receiving the load, and is opposite to the defense plate 40 receiving the load (that is, the other end side of the end portion of the vertical plate 60 in contact with the defense plate 40). A compressive force acts on the concrete 100 located in the area. The concrete 100 filled in the deterrent pile 20 has a feature that it is strong against compressive force and weak against tensile force, and receives compressive force, so it can maintain durability. Moreover, since the defense plate 40 receives a tensile force, it is preferable to select a material that is strong against the tensile force.

Moreover, as illustrated in FIG. 6B, the restraining pile 20 receives a load and generates a shearing force therein. Specifically, the restraint pile 20 maintains a balance of force between the shearing force in the direction in which the load is received and the shearing force in the opposite direction to the shearing force, thereby preventing a state in which no cutting or deviation occurs. I keep it. The restraint pile 20 can improve the effect of preventing the occurrence of cutting or deviation against these shearing forces by the vertical plate 60 included in the support column 50. The vertical plate 60 includes a plurality of through-holes 120. By increasing the contact area by filling the through-holes 120 with the concrete 100, the vertical plate 60 can prevent cutting or slippage due to shearing force. it can.
Further, as illustrated in FIG. 5D, the vertical plate 60 can improve durability against shearing force and displacement by inserting the cross member 140 into the through hole 120. Specifically, the vertical plate 60 increases the contact area with the concrete 100 to be constructed by inserting the cross member 140 into the through hole 120.
Further, the cross member 140 receives the load received by the defense plate 40 via the vertical plate 60. The cross member 140 receives a reaction force against the shear force from the concrete 100 in the vicinity by the action of the shear force generated by the transmitted load. Therefore, the vertical plate 60 can further improve the durability against compressive force, tensile force, and shear force when the cross member 140 is inserted into the through hole 120.
Thus, the suppression pile 20 can improve durability of the suppression pile 20 by providing the through-hole 120 in the support | pillar 50. FIG. Moreover, the suppression pile 20 can further improve durability by inserting the cross member 140 into the through hole 120.

As described above, according to the column structure according to Embodiments 1 and 2, the load from the predetermined direction can be efficiently reduced. The strut structure is composed of a strut that forms a defense plate and a vertical plate in a T-shaped horizontal cross section, and a concrete member that surrounds at least a part of the strut. The strut structure surrounds at least a part of the vertical plate, and the concrete member is arranged so as to enter the through hole provided in the vertical plate, thereby durability against the force generated in the strut structure, shearing force, etc. Can be improved.
Furthermore, the strut structure can increase the surface area in contact with the concrete member, for example, by inserting an insertion member such as a steel bar or a pipe into the through hole, and can disperse stress in the insertion member. it can. Therefore, the support structure can be expected to further improve durability.
As mentioned above, although embodiment which concerns on this invention was described, it is not limited to these, A various change, addition, etc. are possible within the range which does not deviate from the meaning of invention.

[Modification according to Embodiment 1]
Next, a modification according to the first embodiment will be described.
FIG. 7 is a diagram for explaining modifications (a) to (d) according to the first embodiment.
FIG. 8 is a diagram for explaining modifications (e) to (f) according to the first embodiment.
In the sabo dam 1 according to the first embodiment, the debris flow or the like is suppressed by the defense wall 4 of the sabo wall 2, but the present invention is not limited to this.
As illustrated in FIG. 7A, the sabo dam 1 includes a sabo wall 2 installed in the river width direction (crossing direction of the river), and a horizontal member such as a steel pipe or a round bar. You may install so that it may lie sideways. By installing the horizontal member, the sabo dam 1 can be easily replaced even if the horizontal member is damaged.
Moreover, as illustrated in FIG. 7B, the sand barrier 2 is not formed in the shape of a square pillar, but the width of the sand barrier 2 extends from the defense wall 4 (upstream side) to the vertical plate 6 (downstream side) in contact with the defense wall 4. May be configured to be narrow. With this configuration, when a plurality of sand barriers 2 are installed at predetermined intervals, it is possible to prevent the flow of earth and sand, water, and the like from being obstructed and to be prevented from being scraped off.
Moreover, as illustrated in FIG. 7C, the sand barrier 2 may be provided with slits having a predetermined interval on the vertical plate 6 to increase the area in contact with the concrete 10. The sand barrier 2 may be provided with a plurality of slits in the vertical plate 6.
Moreover, as illustrated in FIG. 7D, the sand barrier 2 may be formed such that slits with a predetermined interval are provided in the vertical plate 6 so that the horizontal cross section has a U-shape. The sand barrier 2 may be provided with a plurality of slits in the vertical plate 6 so that the horizontal cross section has an E shape.
Moreover, as illustrated in FIG. 8E, the sand barrier 2 in the first embodiment is configured such that the defense plate 4 and the concrete 10 are separated from each other, but is not limited thereto. The sand barrier 2 may be configured to contact the defense plate 4 and the concrete 10. The sand barrier 2 is easy to manufacture due to the structure in which the defense plate 4 and the concrete 10 are brought into contact with each other.
Further, as illustrated in FIG. 8F, a configuration may be adopted in which the support column 5 is provided with a predetermined amount longer and the support column 5 with the predetermined amount longer is embedded in the installation surface. Alternatively, only the vertical plate 6 may be provided longer by a predetermined amount.

[Modifications of Embodiment 2]
Next, a modification according to the second embodiment will be described.
FIG. 9 is a diagram illustrating a modification according to the second embodiment.
Although the suppression pile 20 which concerns on Embodiment 2 is constructed so that the concrete 100 may satisfy the steel pipe 90 in which the support | pillar 50 is inserted, it does not limit to this.
As illustrated in FIG. 9A, the restraint pile 20 is a region where the support 50 and the concrete 100 are not in contact with each other in a predetermined amount in the direction of the vertical plate 60 from the surface in contact with the vertical plate 60 related to the protection plate 40 (non-contact). An area 300) may be provided and filled with soil or sand. At this time, the through hole 120 provided in the vertical plate 60 is included in the concrete 100.
The suppression pile 20 can prevent the stress generated in the protection plate 40 from being transmitted to the concrete 100 by filling the non-contact region 300 with soil or sand. Moreover, since the suppression pile 200 can provide the range which the plastic deformation of the defense board 40 can be provided by the non-contact area | region 300, the fracture | rupture of the concrete 100 can be prevented.
Further, when the restraint pile 20 is erected on the installation surface, the support column 50 may be provided longer than the steel pipe 90 by a predetermined amount. The restraint pile 20 can improve the fixing force with the installation surface by providing the column 50 longer than the steel pipe 90 by a predetermined amount. Further, by providing the cross member 140 in the through hole 120, further improvement of the fixing force can be expected. Further, as illustrated in FIG. 9B, the deterrent pile 20 is composed of a column 50 and concrete 100. The The deterrent pile 20 can reduce the manufacturing cost by not using the steel pipe 90. In the case where the steel pipe 90 is not used, for example, the restraint pile 20 is made of the concrete 10 using high-strength concrete.
Moreover, although the support | pillar 50 may be comprised using the elongate defense board 40 and the vertical board 60, it is not limited to this, The support | pillar 50 divided | segmented into predetermined length is connected. It may be configured. The struts 50 are connected by, for example, welding connection or bolt connection for joining the divided struts 50. Moreover, the support | pillar 50 may be connected by welding etc. using the plate-shaped connection board for the site | part divided.
In addition, as illustrated in FIG. 9C, the deterrent pile 20 is not limited to a structure in which the entire length is constituted by the steel pipe 90. The vicinity may be predicted, and the steel pipe 90 may be disposed only in a portion where the load is applied.
With this configuration, the restraint pile 20 can reduce the manufacturing cost and can maintain the strength against the load.
Moreover, the suppression pile 20 illustrated in FIG. 9A to FIG. 9C may be configured by inserting the cross member 140 into the through hole 120 provided in the support column 50.

FIG. 10 is a diagram illustrating a modification of the construction method according to the second embodiment.
Since the deterrent pile 20 requires a length that reaches the non-moving layer, when it is a long one, it exceeds 50 m. For this reason, since the restraint pile 20 cannot be transported in a long state, the constituent members of the restraint pile 20 are transported to the placement site and assembled at the placement site.
First, as illustrated in FIG. 10A, the worker manufactures a concrete secondary product using the support 50 at a factory, for example. The worker arranges the concrete 100 so as to enclose at least a part of the column 50 and manufactures the column 52. The concrete column 100 is arrange | positioned so that the support | pillar 52 may enclose the vertical board 60 provided with the through-hole 120. FIG. At this time, the support member 52 may be provided with the cross member 140 in the through hole 120.

Here, the construction method of the suppression pile 20 in this modification demonstrates the case where the steel pipe 90 is used, and the case where the steel pipe 90 is not used.
First, the case where the steel pipe 90 is used will be described.
As illustrated in FIG. 10B, the support column 52 is inserted into the steel pipe 90.
As illustrated in FIG. 10C, in the steel pipe 90, a concrete 100 a is placed in a gap portion between the support column 52 and the inner wall of the steel pipe 90 by an operator. Thus, the suppression pile 20 is manufactured. The manufactured suppression pile 20 is installed by being inserted into the excavated hole. The steel pipe 90 is not limited to a metal member, and may be a synthetic resin member or a paper member (for example, a void). The concrete 100a may be a mortar.

Next, the case where the steel pipe 90 is not used will be described.
As illustrated in FIG. 10D, the operator drills a predetermined hole so that the depth reaches the fixed layer. The support column 52 is inserted into a hole excavated by an operator.
As illustrated in FIG. 10E, the concrete 100a is placed in a gap portion between the support column 52 and the inner wall of a predetermined hole excavated. Thus, the suppression pile 20 is installed in a predetermined place using a concrete member. At this time, the concrete 100a is preferably high-strength concrete.
As described above, the deterrent pile 20 can maintain the predetermined quality and strength by producing the support 52, which is a secondary product, in advance.
Moreover, although the case where the horizontal cross section was T-shaped was demonstrated for the support | pillar 52, even when a horizontal cross section is H-shaped, it is applicable.

[Other variations]
Moreover, in the support | pillar structure illustrated by the said Embodiment 1-2, although what is connected so that the connection angle of a defense board and a vertical board may become a substantially right angle, it is not limited to this, It is also possible to appropriately change the connection angle between the defense plate and the vertical plate according to the direction of impact.

2 Sabo wall 4, 40 Defense plate 6, 60 Vertical plate 5, 50 Post 8 Base plate 10, 100 Concrete 12, 120 Through hole 14, 140 Cross member 20 Deterrent pile 90 Steel pipe

Claims (4)

A strut structure used to reduce impact at the time of collision from a predetermined direction,
A post having a T-shaped horizontal cross section;
A plurality of through holes formed in the support column;
A reinforcing member that reinforces against the compressive force applied to the column,
The reinforcing member is disposed so as to surround at least a part of the column. The column is
A defense plate made of a plate-shaped metal member and installed so as to face the direction of collision;
It is composed of a plate-shaped metal member, and includes a vertical plate whose end is bonded to the plane of the defense plate,
A plurality of the through holes are formed by a predetermined interval, arrangement, or a combination thereof in the thickness direction of the vertical plate,
The support structure according to claim 1, wherein the reinforcing member is disposed so as to surround at least a part of the vertical plate and to enter the through hole. And further having an insertion member inserted into the through hole,
The support structure according to claim 1, wherein the reinforcing member is made of concrete and is placed so as to surround a state in which the insertion member is inserted into the through hole. Inserting part or all of a post having a T-shaped horizontal cross section into a predetermined hole;
Placing the concrete so as to surround at least a part of the periphery of the pillar inserted in the predetermined hole.

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