JP2008101467A - Rockfall preventive fence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rockfall preventive fence which reduces the outflow of sediment after construction, by minimizing tree trimming of standing timbers, without damaging the natural ground, while relatively easily constructing the fence in a place near a rockfall occurrence place such as a mid-slope face and steep slope land. <P>SOLUTION: A foundation is formed by vertically embedding a pile body composed of a pipe material of arranging a base on the top end at a predetermined interval in a construction area, and a column of arranging a base in a lower end part is connected to the pile body composed of this pipe material by superposing and fixing the mutual bases. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rockfall prevention fence.

  Falling rocks from high altitudes can cause serious injury and destruction of facilities. Conventionally, as shown in FIG. 1, a rock fall prevention fence with a multi-stage cable B between the columns A and A or a wire mesh C is used as shown in FIG. The fence was generally a foundation using concrete D.

However, such a concrete foundation method is difficult to install when trying to install on a slope, regardless of whether the installation site is flat, a point that induces destruction of the earth and sand environment in the installation area, a point of falling rocks There was a problem in that it was necessary to include from the road to the road in the design strength.
That is, in the conventional method, a concrete foundation with a large volume must be constructed, so if you try to construct it on the middle of a steep slope, above the slope (back), you have to transport and cast a large amount of concrete, This is very difficult to work, and even if it is installed on the slope, the slope is damaged during construction. There was concern.

  In addition, the construction of concrete foundations on the slopes requires large-scale excavation of the natural ground and excavation of vegetation, which causes sediment runoff and natural destruction. Furthermore, since the concrete foundation installed in the middle of the slope cannot expect the earth pressure on the front, the foundation size increases. As a result, there has been a problem that causes sediment collapse (arc slip).

  For the above reasons, it has been difficult to install a rockfall protection fence near the rockfall occurrence site with a small rockfall energy, such as near the top of the slope, the middle, etc. As a result, the mileage from the rockfall occurrence point is increased, Since it would lead to an increase in rockfall energy, the structure of the fence along the route needed to be strengthened, and the economic efficiency was impaired.

  The present invention has been made in order to solve the above-described problems, and the object of the present invention is that it can be relatively easily constructed on a slope or a steep slope near a rockfall occurrence place. It is intended to provide a rockfall prevention fence that does not damage the ground, minimizes the logging of standing trees, and reduces the outflow of earth and sand after construction.

  In order to achieve the above-mentioned object, the present invention uses a pile body made of a pipe material provided with a base at the top and a support provided with a base at the lower end in a fence in which a rock fall prevention member is mounted on a plurality of supports. As a basic feature, the pile body made of the pipe material is vertically embedded in the construction area at a predetermined interval as a foundation, and the base of the pile body made of the pipe material and the base of the lower end portion of the support column are superposed and fixed. Yes.

The foundation of the rockfall prevention fence is made of a pile made of pipe material, and the pile is constructed by burying the pipe material vertically on the slope, etc. There is no concern about the subsequent loss of sediment. Therefore, it is possible to easily perform construction where the rockfall energy close to the rockfall occurrence site such as the slope or steep slope is small, and the cutting of standing trees can be minimized. Can also be good.
In addition, since the pile body is a pipe material, there is no directionality in strength, and the pillars are connected and built using the hollow structure of the pipe material. Since it has a base at the end and is connected to the base at the lower end of the column by superposition fixing, it is possible to easily establish a stable column and obtain excellent effects such as obtaining a reinforcing effect .

Further, according to the present invention, in a fence in which a rockfall prevention member is mounted on a plurality of columns, pile bodies made of pipe material are vertically embedded in a construction area at a predetermined interval, and the cross-sectional area is smaller than that of the pipe material. Inserting the insertion material with the base connected to the end into the pile body made of the pipe material, filling the pipe material with the hydraulic plastic material, joining the pile body made of the pipe material and the insertion material, the lower end The support column provided with a base is placed on the insertion material, and the support column base is superposed on the insertion material base.

According to this, since the cross-sectional area is smaller than that of the pipe material and the insertion material in which the base is coupled to the top end is used in combination, the pile body has a so-called multiple pipe structure or multiple structure, so the strength is very high. As a result, a stable and strong rockfall prevention fence can be obtained. Moreover, there is an advantage that it can be easily performed in the field. When the pipe material is filled with hydraulic plastic material, the pipe material becomes a formwork, and it becomes a solid pile body with no gap inside, so the strength is improved and the pipe material and the insertion material are integrated. Can form a solid foundation.
Pipe materials include those having ribs on the outer surface.
According to this, since the reinforcement effect is large and the apparent pipe material diameter is increased, the yield strength as a pile can be increased.

  The insertion material includes both a pipe material and a shaped steel material. According to this, the strength is extremely high, and a stable and strong rockfall prevention fence can be obtained.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIGS. 2 to 7 show a first embodiment of a rockfall prevention fence according to the present invention, where N is a slope on which the rockfall prevention fence is installed, and 1 is vertically embedded in the slope N at a predetermined interval. A pipe material as a pile and a steel pipe is preferable, but an FRP pipe, a concrete pipe, or the like can also be used.
Reference numeral 2 is a terminal column built in connection with the pipe material 1, and 2 ′ is an intermediate column built in connection with the pipe material 1, each composed of a shape steel material such as H-shaped steel or a pipe material Has been.

The pipe material 1 can be embedded by any method, and the ground surface of the slope N, for example, a gravel layer, is drilled by a drilling means, and the pipe material is disposed in the hole. The perforation and the pipe material may be installed by driving the pipe material after the perforation, but it is also convenient that the perforation and the embedding are performed at the same time. This can be done by, for example, using a bit machine, fitting the pipe material 1 to the rod of the machine, proceeding with the pipe embedding at the same time as drilling, and removing the machine when the drilling reaches a predetermined depth. It is a method of burying.
The connection form of the support pillars 2 and 2 'to the pipe material 1 will be described. In this embodiment, the support pillars 2 and 2' have a base at the bottom as shown in FIGS. That is, a bracket is welded to the lower end side surface of the support columns 2 and 2 ', and the bracket is joined to the base 2a by welding or the like.
On the other hand, an insertion material 2b having a smaller cross-sectional area than the pipe material 1 is prepared as a reinforcing member, and a base 2a 'is joined to the top end of the insertion material 2b by welding or the like. The insertion material 2b is a pipe material in this example, but may be a reinforcing bar, a deformed steel bar, another steel material processed product, or the like.

The insertion material 2b is inserted into the pipe material 1 that is already embedded in the ground, and in this state or before, a hydraulic plastic material 2c such as mortar or concrete is poured and filled into the pipe material. The outer surface of the material 2b and the inner surface of the pipe material are joined. When the insertion material 2b is a pipe material, the mortars 2 are also filled in the space of the insertion material 2b, and are integrated thereby to improve the strength.
The bases 2a and 2a 'are superposed and firmly fixed with bolts and nuts 2d using holes provided in them.

Reference numeral 3 denotes a multi-stage fence constituent member in which a terminal is connected between the terminal struts and an intermediate portion is supported by the intermediate strut 2 ', and may be a bar, an L-shaped steel, a strip, or the like. In this example, a cable is used. The end strut 2 is connected to a cable end fitting 20 having a rod rigidly connected thereto, and the intermediate strut 2 'is supported by a U-bolt or the like.
4 is an interval holding material arranged in the direction perpendicular to the cable extension between the support columns in order to keep the intervals between the fence members 3 constant and to cooperate with each other. A slit that matches the interval is provided, and the contact surface is covered with rubber or the like so as not to shear and break the fence member.

  5 is a wire net stretched around the fence member 3 to collect relatively small loose matter, and the extension portion 5a is reversed at the bottom of the column so as to be along the slope N on the mountain side and fixed by the anchor 50. Yes.

  Reference numeral 6 denotes a support body for the terminal column 2, which is made of a steel strip or the like, and is configured as an oblique member whose upper end is coupled to the side surface of the terminal column 2 with a bolt, and the lower end is connected to the pipe member 1 embedded in the slope. ing. The connection is optional, but in this example, it is the same as the connection method of the support column and the pipe material 1, that is, the lower part of the support body 3 is integrated with the base 3a, and the base 2a ′ at the upper end of the insertion material 2b is integrated. And polymerization integrated. The middle of the support body 6 and the support are connected by an auxiliary support 6 '.

  In this example, a flat portion is selected as the slope portion where the pipe material 1 is to be embedded, but otherwise, as shown in FIG. 8, the pipe material upper end portion 100 protruding from the slope surface is covered and the upper surface is covered. You may give the filling 9 by spraying mortar, compacted soil, etc. so that it may contact with baseplate 2a '. Spray mortar is suitable for landscape when mixed with coloring materials such as charcoal.

According to this embodiment, the pipe material 1 is embedded in the ground surface of the slope N, the insertion material 2b is inserted into the pipe material 1, the hydraulic plastic material 2c such as mortar is poured, and the base 2a at the top of the insertion material. Since the base and skeleton structure of the fence are completed by superimposing and connecting the base 2a at the lower end of the column to ', the construction is simple and the foundation is a double structure of the pipe material 1 and the insertion material 2b. Strength is improved.
Although not shown, a base is joined to the top end portion of the pipe material 1 by welding or the like, and this base, the base 2a 'at the top end of the insertion material, and the base 2a at the bottom end of the support are overlapped and connected. Also good. According to this, it is possible to form a foundation having higher stability and higher strength.

FIG. 9 shows another example of the above-described embodiment. A single base 2a is used as a common member, the lower ends of the supports 2 and 2 are joined to each other by welding or the like, and the top of the insert 2b is placed below. The ends are joined by welding.
According to this structure, as shown in FIG. 9B, the column is built by inserting the insertion member 2b into the pipe member 1, so that the bolting operation can be omitted.
In addition, although bolting is required, in order to improve strength and stability, a base may be joined to the top end portion of the pipe material 1 by welding or the like, and the base 2a as a common member may be fixed thereto by polymerization. .

FIG. 10 shows another example of the pipe material 1 according to the present invention. In this example, the pipe material 1 has a plurality of ribs 10 on the outer surface. The rib 10 is made of a plate or the like and is welded to the outer surface of the pipe material.
According to this structure, the strength of the pipe material is increased and the apparent diameter of the pipe material is increased, so that there is an advantage that the yield strength as a pile can be increased.
Of course, this pipe material structure is not limited to the connection method with the pillars shown in the first embodiment, but is also applied to the connection method with various pillars described later. The pipe material may have a rib on the inner surface.

The present invention is not limited to the above embodiment.
(1) The connection between the pipe member 1 and the support columns 2 and 2 'is not limited to that shown in the figure, and may take various forms. Some examples are shown below, but are not limited thereto.
1) As shown in FIG. 11 (a), the base 1a is joined to the top end of the pipe material by welding or the like, and the base 2a is welded to the lower ends of the support columns 2 and 2 'as in the first embodiment. The bases 1a and 2a are superposed and joined with bolts and nuts. In addition to plates, tubes can be used as the base.
This form has an advantage that the connection between the pipe material and the column can be stabilized and the pipe material can be reinforced.
2) As shown in FIG. 11 (b), in addition to the configuration of 2), the pipe material is filled with a hydraulic plastic material 2c.
This form has an advantage that the strength as a pile is increased because the inside of the pipe material is solid.

<2> As a form of reinforcement, in addition to or instead of reinforcing the pipe member 1 as shown in FIG. 10, the vicinity of the pipe member 1 with respect to the column 2 (2 ′), that is, the rail extension as shown in FIG. The pipe material 1 is embedded at right angles (transverse direction) as described above, and the base 1b with the connecting bracket is directly attached to the top end of the pipe material 1, or the base 1a at the top end of the pipe material or the insertion material top. The base 1b with a connecting bracket is fixed by being overlapped with the base 2a 'at the end, and connected to the base 2a obtained by connecting the lower ends of the columns 2 (2') with the connecting member 9.
In this case, the connection form of the support column and the pipe material may be any of FIG. 5, FIG. 11 (b) and (c).

(3) A hydraulic plastic material (for example, reinforced concrete or averaged concrete) may be placed between the struts or between the pipe type foundations so as to connect the pipe material heads.
However, for convenience, as shown in FIG. 4, the extended portion 5 a of the wire mesh 5 may be inverted at the lower portion of the support, along the slope N, and fixed with the anchor 50.
Alternatively, as shown in FIGS. 13 (a) and 13 (b), columnar members 7 such as thinned wood may be vertically embedded at an appropriate interval, and the columnar member 7 'may be horizontally placed behind the columnar members 7'.
By adopting such a mode, it is possible to avoid pebbles from falling under the fence, accumulation of rainwater, outflow of earth and sand, and overturning of the foundation due to scouring, and because the exposure of the concrete surface is suppressed, the landscape is Can be increased. In addition, effective use of thinned wood is also possible.

FIG. 14 shows a second embodiment of the present invention.
In this embodiment, the pile body is not a pipe material but a section steel material 1 ′ such as an H-section steel. Such shaped steel 1 'is driven directly into the slope N or after being drilled. Of course, a hydraulic plastic material may be used in combination. For example, the shape plastic material 1 ′ may be inserted by filling the hole with the hydraulic plastic material, or the hydraulic plastic material may be filled with the shape steel material 1 ′ being pushed into the hole.
The structural steel material 1 ′ and the support pillars 2 and 2 ′ may be connected to each other by a welding plate or the like by direct welding or the top end of the structural steel material 1 ′ as illustrated in FIG. The base 1a may be coupled to the bottom by welding or the like, the base 2a may be coupled to the lower end portion by welding or the like, and the bases may be overlapped and connected by bolts and nuts or the like.

  Other configurations are the same as those shown in FIGS. 2 to 3, 8, 10, 12, 13, and the like.

16 to 19 show a third embodiment of the present invention.
This example shows a composite type in which a pipe material 1 and a shaped steel material 1 'are used in combination as a pile body.
In the embodiment of FIG. 16, an H-section steel comprising a pipe material 1 embedded in the ground, an insertion material 2 b and a support column 2 (2 ′), and the insertion material 2 b has a cross-sectional dimension equal to or less than the inner diameter of the pipe material 1. And a base 2a 'is connected to the top end by welding or the like. The column 2 (2 ') has a lower end portion coupled to the base 2a via a bracket by welding or the like.
The insert 2b is inserted into the pipe material 1 embedded in advance as shown in FIGS. 17 and 18, and the three members are preferably joined together by a hydraulic plastic material 2c filled in the pipe. And the base 2a 'of a support | pillar is mounted in the base 2a' of the top end of the insertion material 2b, and it connects with a volt | bolt nut etc. Also in this embodiment, the pile body has a multi-layer structure, so that the strength is increased.

FIG. 19 shows another example of the third embodiment, in which the base 2a is a common member, the lower ends of the support columns 2 and 2 are joined to each other by welding or the like, and the top of the insertion member 2b made of a section steel material is joined to the lower part. The ends are joined by welding.
According to this structure, as shown in FIG. 19B, the column is built by inserting the insertion member 2b into the pipe member 1, so that the bolting operation can be omitted.
In addition, although bolting is required, in order to improve strength and stability, a base may be joined to the top end portion of the pipe material 1 by welding or the like, and the base 2a as a common member may be fixed thereto by polymerization. .
Other configurations are the same as those shown in FIGS. 2 to 3, 8, 10, 12, 13, and the like, and thus description thereof is omitted.

  The present invention is not only suitable as a rock fall prevention fence on slopes and slopes, but is also effective as a rock fall prevention fence on flat ground that has been cut.

(a), (b), (c), (d) is the top view, front view, and left-right side view of the conventional rock fall prevention fence. It is a top view which shows 1st Example of the rock fall prevention fence by this invention. It is a front view of 1st Example. (a) (b) is a vertical side view of the first embodiment. FIG. 5 is a partially enlarged view of FIG. 4. It is sectional drawing which follows the XX line of FIG. It is a perspective view of the use member of the 1st example. (a) (b) is a vertical side view which shows another example of the processing form of a pipe material embedding part. (A) is a partial perspective view which shows another example of 1st Example, (b) is sectional drawing of a construction state. (a) is a partial perspective view which shows the other example of the pipe material in this invention, (b) is a front view which shows the usage example of the pipe material of (a). (A) and (b) are the fragmentary sectional views showing other examples of combination of a support and pipe material. It is a side view which shows the example of reinforcement in this invention. (A) is a longitudinal front view which shows the other example of the filling structure between support | pillars, (b) is sectional drawing which follows the YY line of (a). (A) (b) is a side view which shows 2nd Example of this invention, (c) is sectional drawing which follows the ZZ line of (a). It is sectional drawing which illustrates the connection of the support | pillar and pile body of 2nd Example. It is a perspective view which shows the 3rd Example of this invention in an exploded state. It is sectional drawing which shows the installation state of 3rd Example. It is a cross-sectional view of FIG. (A) The perspective view which shows the other aspect of 3rd Example, (b) is sectional drawing of an installation state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe material 2, 2 'Prop 2a, 2a', 1a Base 2b Insertion material 2c Hydraulic plastic material 3 Fence component

Claims (5)

In a fence with a rockfall prevention member mounted on multiple pillars, use a pile body made of pipe material with a base at the top and a pillar with a base at the bottom,
The pile body made of the pipe material is vertically embedded at a predetermined interval in the construction area as a foundation, and the base of the pile body made of the pipe material and the base of the lower end portion of the support are overlapped and fixed to prevent falling rocks fence.   In a fence in which a rockfall prevention member is mounted on a plurality of columns, pile bodies made of pipe material are vertically embedded in the construction area at predetermined intervals, and the cross-sectional area is smaller than the pipe material, and the base is coupled to the top end. A pillar having a base provided at the lower end thereof is inserted into a pile body made of the pipe material, the pile body made of pipe material is filled with the hydraulic plastic material, and the pipe body made of the pipe material is joined. A rockfall prevention fence characterized in that the base of the support is overlapped with the base of the insertion material.   The rock fall prevention fence according to claim 2, wherein the insert is made of pipe material having a smaller cross-sectional area than a pile body made of pipe material, and the base is coupled to the top end. The rock fall prevention fence according to claim 2, wherein the insert is made of a section steel having a smaller cross-sectional area than a pile body made of a pipe material, and the base is coupled to the top end.   The rock fall prevention fence according to claim 1 or 2, including a pile body made of a pipe material having ribs on the outside.

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