JP5467067B2 - Support fence structure of avalanche, rockfall, etc. - Google Patents

Description

  The present invention relates to a support fence structure for preventing a landslide caused by a falling rock, an avalanche, or the like.

  Conventionally, protective fences are known as protective structures constructed for the purpose of preventing landslides caused by falling rocks or avalanches.

  A protective fence has been proposed in which a plurality of pipe columns are juxtaposed on the slope of a mountainside and a plurality of stages of cables and wire meshes are stretched between the plurality of pipe columns (for example, Patent Document 1). In order to withstand loads such as falling rocks and avalanches from the mountain side, the struts used for such a protective fence increase stress by arranging a reinforcing material in the steel pipe.

  As a support for arranging the reinforcing material in the steel pipe, the outer steel pipe and the inner steel pipe are arranged concentrically with each other along the same axis, and the annular gap between the outer steel pipe and the inner steel pipe is filled with concrete. (For example, Patent Document 2) has been proposed. Moreover, what has a concrete filling layer between the steel inner pipe and the corrosion-resistant metal outer pipe surrounding the steel inner pipe has been proposed (for example, Patent Document 3).

JP 2010-168833 A Japanese Patent Laid-Open No. 08-184037 Japanese Patent Laid-Open No. 05-132966

  In the columns proposed in Patent Document 2 and Patent Document 3, an excavator capable of efficiently drilling holes can be used as a column of a protective fence provided for suppressing landslide or retaining a soil in the formation. The concrete filled in can be used as a strength member, and the load resistance can be improved.

  However, in the columns proposed in Patent Document 2 and Patent Document 3, the pipe end of the outer steel pipe and the pipe end of the inner steel pipe provided for reinforcement are formed to be approximately the same size. There is a problem in terms of workability and material cost increase at the construction site. Further, no consideration is given to reinforcement for a portion where stress against the load such as rock fall and avalanche is most required.

  In view of the above problems, an object of the present invention is to provide a strut structure for a protective fence such as avalanche and falling rock that is excellent in economic efficiency and can effectively improve work efficiency and load bearing capacity.

According to a first aspect of the present invention, in a support structure of a protective fence such as an avalanche and falling rock that stands on the ground, a large-diameter pipe, a medium-diameter pipe inserted into the large-diameter pipe, and a medium-diameter pipe inserted into the medium-diameter pipe A triple pipe is formed with a small diameter pipe, and the triple pipe is formed from the upper part of the large diameter pipe above the installation surface to the lower part of the large diameter pipe below the installation surface, and is provided at the lower end of the small diameter pipe. A lower end of the medium-diameter pipe is formed by a locking portion to form a double pipe, the double pipe is inserted into the large-diameter pipe, and a connection hole drilled in an upper portion of the large-diameter pipe; The connecting hole drilled in the upper part of the small diameter tube is connected by connecting means .

According to the structure of Claim 1, since a triple pipe can be easily formed with the three pipe materials from which a diameter differs, workability | operativity in the field can be improved. In addition, a triple pipe is formed by arranging a medium-diameter pipe and a small-diameter pipe as reinforcing materials in the part where stress against the load such as falling rocks and avalanches is most required, so that the stress against the load can be effectively improved. Can do.

  Moreover, according to the structure of Claim 1, since the lower end of a medium diameter pipe can be latched by the latching | locking part provided in the lower end of a small diameter pipe, a double pipe can be formed easily and this double pipe is Since the triple tube can be formed by simply inserting it into the large-diameter tube, the reinforcing structure is simplified, and the stress with respect to the load can be improved along with the workability on site.

Moreover, according to the structure of Claim 1 , the positioning of a reinforcing material and the connection operation | work between members become easy with the connection hole drilled in the upper part, The stress with respect to a load can be improved with workability | operativity on the spot. .

It is a front view of the protection fence which shows Example 1 of this invention. It is a side view of a triple pipe as above. It is a top view of a large diameter pipe same as the above. It is a front view of a buffer metal fitting same as the above. It is a side view of a buffer metal fitting same as the above. It is a side view of a medium diameter pipe same as the above. It is a side view of a small diameter pipe same as the above. It is sectional drawing of a small diameter pipe same as the above. It is a partial enlarged view of a small diameter pipe same as the above. It is sectional drawing which shows the attachment state of a rod-shaped member same as the above. It is a partial enlarged view which shows the attachment state of a rod-shaped member same as the above. It is a top sectional view showing the attachment state of a triple pipe same as the above. It is a lower section showing the attachment state of a triple pipe same as the above. It is sectional drawing of a support | pillar cap same as the above. It is a partial enlarged view which shows the attachment state of a support | pillar cap and a movable bracket same as the above. It is sectional drawing of the support | pillar which shows the reference example 1 of this invention. It is a side view of a reinforced steel material same as the above. It is sectional drawing of a support | pillar which shows the reference example 2 of this invention.

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIG. 1, the guard fence 1 is provided with terminal columns 2 and 2 erected at predetermined intervals in the crossing direction of the inclined surface S inclined between the mountain side Y and the valley side T, and the terminal column 2 , 2, the intermediate support column 3 is erected, the cable 4 is passed to the mountain side Y between the terminal support columns 2, 2 and the intermediate support column 3 so as to form a plurality of stages in the vertical direction, and a wire mesh 5 is stretched here. Thus, the protective surface 6 is formed.

  In this embodiment, as a support used for such a protective fence 1, a large-diameter pipe 7 erected on the ground, a medium-diameter pipe 8 smaller in diameter than the large-diameter pipe 7, and a medium-diameter pipe 8. A triple pipe 10 in which a small diameter pipe 9 having a small diameter is integrated is used.

  The large-diameter pipe 7 constituting the triple pipe 10 is built in the ground by drilling a mounting hole B on the slope 101 which is the installation surface of the mountain side Y, which is the installation location, using a bore, and inserting into the mounting hole B. It consists of a lower part 11 and an upper part 13 forming a protective surface 6. As shown in FIG. 2, the lower portion 11 of the large diameter pipe 7 needs to be deeply built in the inclined surface to withstand loads due to falling rocks or avalanches from the mountain side Y, and is inserted from the installation surface to the lower end 12. The depth S is approximately half of the total length H1. The upper portion 13 of the large-diameter pipe 7 is provided with two attachment pieces 16 each provided with attachment holes 15 for attaching the column caps 14, and the front surface of the large-diameter pipe 7, which is an intersecting direction of the attachment pieces 16. On the side, a connecting hole 17 connected to the small-diameter pipe 9 is formed, and buffer metal fittings 18 for passing the cable 4 between the support columns are provided at a predetermined interval in the vertical direction.

  Here, the shock-absorbing bracket 18 will be briefly described.The shock-absorbing bracket 18 includes a front grip body 20 having a substantially semicircular groove portion 19 and a rear grip body 21 having a substantially semicircular groove portion. A pair of front and rear grip bodies 22 are formed. The pair of front and rear grip bodies 22 are provided with two insertion holes 23 and 23 which are inserted from the front to the rear. When the cable 4 is sandwiched between the pair of front and rear grip bodies 22, the two insertion holes 23 are provided. , 23, a bolt 24 serving as a connecting means is inserted, and a nut 25 is screwed onto the tip of the bolt 24 so as to be fastened and fixed to the fixing member 26. According to the shock absorber 18 having such a configuration, when an impact force such as falling rocks is applied to the protective surface 6 and a tension is generated in the cable 4, the cable 4 is frictionally slid so that a part of the impact force can be absorbed. it can.

  Next, the medium diameter tube 8 constituting the triple tube 10 is formed such that the full length H2 is shorter than the large diameter tube 7. The lower end 27 of the medium diameter pipe 8 is provided at a position that is substantially half of the lower part 11 corresponding to the depth of penetration of the large diameter pipe 7. Further, the upper end 28 of the medium diameter pipe 8 is provided at a position lower than the position of the upper end 29 of the large diameter pipe 7.

  The small-diameter tube 9 constituting the triple tube 10 is formed so that the overall length is shorter than the large-diameter tube 7 (H3 <H1) and longer than the medium-diameter tube 8 (H3> H2). At the lower end 30 of the small diameter tube 9, four locking pieces 31 as locking portions are formed at equal intervals on the outer peripheral surface 32 of the tube, and the position of the lower end 30 is substantially the same position as the lower end 27 of the medium diameter tube 8. Is provided. The upper end 31 of the small-diameter pipe 9 is provided at a position slightly lower than the position of the upper end 29 of the large-diameter pipe 7, and an insertion hole 34 through which a rod-like member described later is inserted is formed in the upper part 33. A connecting hole 35 is formed in the crossing direction of the hole 34 to connect to the large diameter pipe 7. The small-diameter pipe 9 and the medium-diameter pipe 8 are continuously provided in a range sandwiching the slope 101, which is a portion where stress (load resistance) against the load such as falling rocks and avalanches is most required, so that the present embodiment is implemented. In the example, the overall lengths are different from each other for reasons such as reducing material costs, but the overall lengths of the small diameter tube 9 and the medium diameter tube 8 may be the same.

  Then, the large diameter pipe 7, the medium diameter pipe 8, and the small diameter pipe 9 are integrated to form a triple pipe 10.

  Usually, when the triple tube 10 is formed, the medium-diameter tube 8 and the small-diameter tube 9 may be sequentially arranged in the large-diameter tube 7, but in this embodiment, the large-diameter tube 7, the medium-diameter tube 8, Since the total length H of the small-diameter pipe 9 is different, it is necessary to position and arrange the small-diameter pipe 9 with respect to the reinforcing portion. Therefore, in this embodiment, the small-diameter pipe 9 and the medium-diameter pipe 8 are positioned and combined as a double pipe 36, and then the double pipe 36 is inserted to a predetermined position in the large-diameter pipe 7 so that the triple pipe is inserted. The triple tube 10 was used.

  First, when the small-diameter tube 9 is inserted into the medium-diameter tube 8, the lower end 27 of the medium-diameter tube 8 comes into contact with the locking piece 31 formed at the lower end 30 of the small-diameter tube 9, and thereby the medium-diameter tube 8 And the lower ends 27 and 30 of the small-diameter pipe 9 are combined at substantially the same position to form a double pipe 36. A rod-shaped member 37 made of a round steel bar, a reinforcing bar, or the like is inserted into an insertion hole 34 formed in the upper portion 33 of the small-diameter tube 9, and a hanging tool (not shown) is hooked on the rod-shaped member 37 so that the double tube 36 can be lifted.

  Then, the double pipe 36 is suspended and inserted into the built-in large-diameter pipe 7. At this time, the insertion depth S ′ of the double pipe 36 is set to approximately 2/3 of the lower portion 11 (the depth of penetration), which is the portion where stress (load resistance) is most required, and a protective surface is formed. A range from the upper part 13 of the large-diameter pipe 7 to approximately half of the lower part 11 of the large-diameter pipe 7 is reinforced. Then, the connecting hole 17 drilled near the upper end 28 of the large-diameter pipe 7 and the connecting hole 33 drilled near the upper end 31 of the small-diameter pipe 9 are aligned, and the connecting means 17 and 33 are connected to the connecting means. By inserting a bolt 38 and screwing a plurality of nuts 39 to both ends of the bolt 38, the large-diameter pipe 7 and the double pipe 36 are integrated to form the triple pipe 10.

  The triple tube 10 formed in this way is integrated as a support by filling the triple tube 10 with an amorphous hardener 40 such as cement milk, and a support cap 14 is attached to the upper end 28 of the triple tube 10.

  The column cap 14 includes a cylindrical cap body 41 that fits to the upper end 28 of the column (large-diameter pipe 7), and plate-shaped mounting pieces 43 provided at two positions on the lower end 42 of the cap body 41. The piece 43 is provided with an attachment hole 44 for connection with the attachment piece 16 of the support column corresponding to the attachment piece 16 formed in the large-diameter pipe 7 of the support column. Further, the attachment holes 44, 44 formed in the two attachment pieces 43, 43 have a hook shape that is single-opened in the same direction.

  A movable bracket 45 is provided between the support piece 43 of the support cap 14 and the support piece 16 of the support. The movable bracket 45 is composed of a plate-like connecting piece 48 for connecting a connecting rod 47 provided between the column upper parts 46 of the protective fence 1 and an attachment piece 49 bent at a right angle from the connecting piece 48. A mounting hole 50 is formed in the piece 49.

  Then, the support cap 14 and the movable bracket 45 are attached and fixed to the support. First, a bolt 51 is inserted into the mounting hole 50 drilled in the movable bracket 49 and the mounting hole 15 drilled in the mounting piece 16 of the support column (large-diameter pipe 7). Temporarily fix 52 and attach the movable bracket 49 to the column. Next, the cap body 41 of the column cap 14 is fitted to the upper end 28 of the column, and the hook-shaped mounting holes 44 and 44 formed in the mounting pieces 43 and 43 of the column cap 14 are temporarily fixed to the bolt 51 position. The mounting holes 44 and 44 of the support cap 14 are arranged at the same positions as the support holes (large-diameter pipe 7) and the mounting holes 15 and 50 of the movable bracket 49, and the temporarily fixed nut 52 is attached. By tightening, the support cap 1 and the movable bracket 49 are attached to the support. Thus, in this embodiment, since the mounting holes 44, 44 of the support cap 14 are formed in a single-open hook shape in the same direction, the mounting process of the support cap 14 can be performed last, so that the working efficiency can be improved. . Further, the movable bracket 45 can make the connecting rod 47 rotatable in the front-rear direction around the mounting hole 50 through which the bolt 51 is inserted as a central axis.

  As described above, according to the column structure of this embodiment, the terminal columns 2 and 2 and the intermediate column 3 are connected by the connecting rod 47 provided on the column upper part 46 and the cable 4 is fixed through the buffer fitting 18. In addition, a series of on-site work in which a wire fence 5 or the like is stretched on the front surface of the cable 4 to construct the protective fence 1 becomes smooth, and further, a portion that requires stress to resist the load is reinforced. Therefore, the stress with respect to the load can be effectively improved.

  As described above, in the present embodiment, in the support structure of the avalanche / falling rock protection fence 1 standing on the ground, the large-diameter pipe 7, the medium-diameter pipe 8 inserted into the large-diameter pipe 7, and the medium-diameter pipe 8 A triple pipe 10 is constituted by a small-diameter pipe 9 inserted into the pipe, and the triple pipe 10 is from a top part 13 of the large-diameter pipe 7 above the slope 101 as the installation surface, and a large-diameter pipe below the slope 101 as the installation surface. 7 is formed at the lower end 11 of the small-diameter pipe 9, and the lower end 27 of the medium-diameter pipe 8 is locked by a locking piece 31 as a locking portion provided at the lower end 30 of the small-diameter pipe 9 to form a double pipe 36. Is formed by inserting the tube into the large-diameter pipe 7, so that the triple pipe 10 can be easily formed by three pipe members 7, 8, and 9 having different diameters, and the workability on the site is improved. Can do. Further, since the triple pipe 10 is formed by arranging the medium diameter pipe 8 and the small diameter pipe 9 as the reinforcing material in the portion where the stress against the load such as rock fall and avalanche is most required, the stress against the load is effectively reduced. Can be improved. Moreover, since the lower end 27 of the medium diameter pipe 8 can be locked by the locking piece 31 provided at the lower end 30 of the small diameter pipe 9, the double pipe 36 can be easily formed. Since the triple tube 10 can be formed simply by being inserted into the tube 7, the reinforcement structure is simplified, and the stress with respect to the load can be improved together with the workability on site.

As described above, in this embodiment, the connecting hole 17 drilled in the upper portion 13 of the large-diameter pipe 7 and the connecting hole 33 drilled in the upper portion 33 of the small-diameter pipe 9 are connected by the bolt 38 serving as a connecting means. Therefore, the connecting holes 17 and 33 drilled in the upper parts 13 and 32 facilitate the positioning of the double pipe 36 as a reinforcing material and the connecting work between the members, and improve the stress to the load as well as the workability on site. Can do.
Reference example 1
FIGS. 16 to 17 show Reference Example 1 of the present invention, in which the same reference numerals are given to the same portions as those in the above-described first embodiment, and detailed description thereof will be omitted.

  In this reference example, an H-shaped steel 53 is disposed in the large-diameter pipe 7, a connection hole 55 formed in the upper part 54 of the H-shaped steel 53, and a connection hole 17 formed in the upper part 13 of the large-diameter pipe. Is a column structure in which a plurality of nuts 57, 57 are screwed into both ends of the bolt 56, and a bolt 56 as a connecting means is inserted.

  Usually, when the support used for the protective fence 1 receives falling rocks, avalanches, collapsed earth and sand from the mountain side Y on the protective surface 6, bending occurs so that the upper end 13 side moves to the valley side T which is the anti-mountain side. It is necessary to reinforce these mountain side Y and valley side T. Therefore, the H-shaped steel 53 of this reference example is composed of plate-like reinforcing ribs 58, 58 arranged on the ridge side Y and the valley side T, and a plate-like connecting member 59 that connects the centers of these plate-like reinforcing ribs 58, 58. Is done.

  Incidentally, the insertion depth S ′ of the H-shaped steel 53 used in this example into the large-diameter pipe 7 is the same as in Example 1 in the lower part 11 (the depth of penetration), which is the part that requires the most stress (load bearing capacity). To 2/3.

  Thus, in this reference example, since the H-shaped steel 53 is disposed in the large-diameter pipe 7 in the support structure of the avalanche / falling rock protection fence 1 standing on the ground, the stress against the load of falling rock, avalanche, etc. Can be reinforced with the H-shaped steel 53, and the stress against the load can be improved.

Further, in this reference example, the connecting hole 17 drilled in the upper part 13 of the large-diameter tube 7 and the connecting hole drilled in the upper part of the H-shaped steel 53 are connected by the connecting means. The connecting hole drilled in the hole facilitates the positioning of the H-shaped steel 53 and the connecting work between the members, and can improve the stress with respect to the load as well as the workability at the site.
Reference example 2
FIG. 18 shows a reference example 2 of the present invention, in which the same reference numerals are given to the same parts as those of the above-described embodiments and reference examples, and detailed description thereof is omitted.

  In this reference example, an H-shaped steel 53 is disposed in the large-diameter pipe 7 in the same manner as in the first reference example, and the connection hole 55 formed in the upper part 54 of the H-shaped steel 53 and the upper part 13 of the large-diameter pipe are provided. This is a strut structure in which the bolt 17 that is drilled is inserted through a bolt 56 that is a connecting means, and a plurality of nuts 57 and 57 are screwed to both ends of the bolt 56. The second embodiment is different from the second embodiment in that plate reinforcing members 60 and 60 are provided on the plate-like reinforcing ribs 58 and 58 on the mountain side Y and the valley side T constituting the H-shaped steel 53.

  As described above, in this reference example, the H-shaped steel 53 is disposed in the large-diameter pipe 7, and the plate-like reinforcing members 60, 58 are formed on the plate-like reinforcing ribs 58, 58 on the mountain side Y and the valley side T constituting the H-shaped steel 53. Since 60 is provided, the stress with respect to the load on the mountain side Y and the valley side T can be further improved.

  The present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, a locking piece may be provided on the inner peripheral surface of the lower end of the medium diameter pipe 8 used in this embodiment, and the lower end of the small diameter pipe 9 may be locked. In this case, the length of the small diameter pipe 9 is the medium diameter. What is necessary is just to comprise by connecting the large diameter pipe | tube 7 and the medium diameter pipe | tube 8 shorter than the pipe | tube 8. The installation surface may be a flat surface other than the inclined surface 101. In addition, when the load due to falling rocks, avalanches, etc. is small, it is not always necessary to use a triple pipe, so the column is composed of a double pipe of a large diameter pipe 7 and a small diameter pipe 9 excluding the medium diameter pipe 8 from the constituent members. Needless to say, it can be done.

1 Guard fence 7 Large diameter pipe 8 Medium diameter pipe 9 Small diameter pipe
10 Triple tube
12 Lower end of large diameter pipe
27 Lower end of medium diameter pipe
30 Lower end of small diameter pipe
31 Locking piece
36 Double pipe
38 bolts (connection means)
40 Amorphous hardener S Insertion depth
53 H-shaped steel
54 Top of H-shaped steel
55 H-shaped steel connection hole

Claims (1)

In the pillar structure of a protective fence such as avalanche and rockfall standing on the ground, a triple pipe is composed of a large diameter pipe, a medium diameter pipe inserted into the large diameter pipe, and a small diameter pipe inserted into the medium diameter pipe And
The triple pipe is formed from the upper part of the large-diameter pipe above the installation surface to the lower part of the large-diameter pipe below the installation surface,
Locking the lower end of the medium-diameter pipe with a locking portion provided at the lower end of the small-diameter pipe to form a double pipe,
The double pipe is inserted into the large-diameter pipe, and a connecting hole drilled in the upper part of the large-diameter pipe and a connecting hole drilled in the upper part of the small-diameter pipe are connected by connecting means. Support fence structure such as avalanche and falling rock.

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