JPH07216830A - Pile foundation structure for falling stone protective net support, and falling stone protective net - Google Patents

Abstract

PURPOSE:To heighten support supporting performance and reliability as well as the constructing performance of pile foundation and improve support erection performance, falling stone protecting performance and durability. CONSTITUTION:The pile foundation structure for falling stone protective net supports is provided with a pipe anchor 1 driven into a slope (a) by the driving force of a driver 11, a resistance plate 2 provided along the upper part of the pipe anchor l so as to protrude on both sides, a base plate 3 fixed to the upper end part of the pipe anchor 1 and the upper edge part of the resistance plate 2, and a support bearer 4 fixed onto the base plate 3 and provided with a support fitting bolt 4a. Pile foundations 10 are driven with horizontal spaces into the slope (a). The support 5 is hinge-connected (4a) onto each pile foundation, and the upper part of each support 5 is supported by a hanging rope 6 or the like for erection. The upper part of a wire gauze 8 reinforced by longitudinal and lateral ropes 7a, 7b is connected to each support 5, and the lower part of the wire gauze 8 is anchored to the slope (a) to stretch the wire gauze 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile foundation structure for a rockfall protection net column and a rockfall protection net which is stretched on a slope and receives rockfalls and the like.

[0002]

2. Description of the Related Art In the conventional rockfall protection net, as shown in FIG. 4, a foundation driving hole (not shown) is normally drilled in each pillar built-in portion of a slope a where there is a risk of rockfall and the like. A concrete pile foundation (anchor bolt is planted) c is placed in the hole for placing, and a strut pedestal d is connected to the anchor bolt on each concrete pile foundation c, and each strut pedestal d is placed. The lower parts of the columns e are hingedly connected to each other, and the upper parts of the columns e are supported by the hanging ropes f etc. to be built up, and the upper part of each column e is connected to the upper part of the wire net i reinforced by the vertical and horizontal ropes g and h. In addition to being connected and suspended, the lower part of the wire netting i is constructed with an anchor k as shown in the figure, and the slope a is covered with the above-mentioned wire netting i in a pocket manner to receive falling rocks and the like.

[0003]

In the conventional rock fall protection net, as described above, the concrete pile foundation is driven by excavating the pillar built-in portion of the slope where the scaffolding is bad. It becomes a troublesome and dangerous work that requires time, labor, and curing time, and the surroundings of the concrete pile foundation are excavated, resulting in unstable and fragile ground. There are problems such as the durability of the protective net being reduced.

The present invention was developed in order to address the above-mentioned problems, and its purpose is to improve the supportability and reliability of the support columns as well as the workability of the pile foundation.
The purpose of the present invention is to provide a pile foundation structure for a rockfall protection net pillar and a rockfall protection net with improved propelling performance, rockfall protection performance, and durability.

[0005]

DISCLOSURE OF THE INVENTION The present invention is directed to a pipe anchor that is driven on a slope by the driving force of a driving machine, and a resistance plate that is provided along the upper portion of the pipe anchor and projects on both sides.
The base plate fixed to the upper edge of the pipe anchor and the upper edge of the resistance plate, and the pillar support structure for the rockfall protection net equipped with the pillar support base with the bolts for fixing the pillar fixed on the base plate. The driving performance of the strut is improved, the precision and the sustainability of the strut are improved, and the supporting performance of the strut and its sustainability are enhanced.

[0006] Further, the above-mentioned pile foundations are driven on the slopes with a horizontal interval, and the pillars are hingedly connected to each pile foundation, and the upper portions of the pillars are supported by suspending ropes or the like to be built up vertically on each pillar. In addition to connecting the upper part of the wire mesh reinforced with a horizontal rope, the lower part of the wire mesh was anchored on the slope to build a rockfall protection net, and the pile foundations were used to build up the pillars, rockfall protection performance, and reliability. It has improved durability as well as durability.

[0007]

In the pile foundation of the present invention, the pipe anchor is easily and accurately driven to the predetermined direction by the propulsion force of the driving machine, and the ground of the driven part is compacted without being disturbed. The frictional force between the pipe anchor and the resistance plate and the ground is increased, a strong reaction force corresponding to the load from the support is generated, and tilting is also effectively prevented,
In combination with the compaction of the ground, the strong supporting force of the column is maintained stably for a long period of time, and excellent column supporting performance and reliability are obtained.

Therefore, the accuracy of erection of the support columns and the tensioning performance of the wire net are effectively improved, and the excellent rockfall protection performance is maintained for a long period of time.

[0009]

FIG. 1 is an overall side view showing an embodiment of the present invention, FIG. 2 shows an embodiment of the pile foundation, and FIG. 3 shows an example of driving of the pile foundation. In the figure, 1 is a pipe anchor, 2
Is a resistance plate projecting from both sides of the upper portion of the pipe anchor 1, 3 is a base plate fixed to the upper edges of the pipe anchor 1 and the resistance plate 2, and 4 is a column support with a column mounting bolt 4a fixedly mounted on the base plate 1. A base 4a is a bolt for mounting a pillar with a nut (hinge connection), 5 is a pillar for hinge connection 4a on the pillar support 4, 5a is a head fitting fixedly mounted on the upper part of the pillar 5, and 6 is a fitting 6a for connection. By the head metal fitting 5 of the pillar 5
Suspended rope connected to a, 7a and 7b are vertical and horizontal ropes,
Reference numeral 7c is a connecting metal fitting, 8 is a wire mesh, 9 is a balance rope that is connected to the U-bolt 9a on the upper portion of the column 1, 10 is a pile foundation of the present invention, and 11 is a cylindrical driving tool.

In the illustrated embodiment, the pipe anchor 1 is driven into the slope a by the propulsive force of the driving machine 11, and the resistance plate 2 is provided along the upper portion of the pipe anchor 1 and protrudes on both sides.
And a base plate 3 fixed to the upper end of the pipe anchor 1 and the upper edge of the resistance plate 3, and a prop support pedestal 4 with a prop mounting bolt 4a fixed to the base plate 3 It has a pile foundation structure.

In addition, in the pile foundation structure of the pillar for rockfall protection nets, the pile foundation 10 is driven into the slope a at a horizontal interval, and the pillars 5 are hinge-connected 4a on each pile foundation 10 and the pillars. The upper part of the wire mesh 5 is supported by a hanging rope 6 or the like to be built, and the upper part of the wire net 8 reinforced by the vertical and horizontal ropes 7a and 7b is connected to each strut 5, and the lower part of the wire net 8 is anchored to the slope a. It is connected to the rockfall protection net that was set up.

More specifically, the pipe anchor 1 preferably has a pipe structure having an inner diameter capable of accommodating a cylindrical driving machine 11 to be described later, and has a taper-shaped lower end portion at all end portions thereof. 1a is formed to improve the driving performance and to increase the frictional resistance with the surrounding ground b. The resistance plate 2 is fixed by welding or the like along both upper sides of the pipe anchor 1 and is projected on both sides to increase the contact area with the surrounding ground b to increase the friction resistance and the reaction force of the ground b. In response to this, the structure is such that the lateral movement of the upper part of the pile foundation 10 is blocked. The base plate 3 is fixed to the upper end portion of the pipe anchor 1 and the upper edge portion of the resistance plate 3 by welding or the like, and has an opening for the pipe anchor 1 in the central portion thereof to enable insertion of the driving tool 11. The structure is such that it receives a reaction force from the ground b. The strut base 4 is composed of a pair of brackets standing on the base plate 3 at intervals with welding and the like, and a strut mounting bolt 4a with nuts inserted into both brackets. 5 has a structure in which the lower end portion of 5 is pivotally attached to form a hinge connection 4a.

The support column 5 is preferably made of H-shaped steel, a U bolt 9a for connecting the balance rope 9 is mounted on the upper portion of the support column 5, and the suspension rope 6 is attached to the head fitting 5a fixedly mounted on the upper end portion thereof. The structure is such that the vertical rope 7a is connected by connecting metal fittings 6a, 7c. Further, a plurality of vertical ropes 7a, horizontal ropes 7b, etc. are incorporated in the wire netting 8 and various connecting fittings are provided as necessary, and the upper part of the wire netting 8 is provided with the plurality of vertical ropes 7a and the head fittings 5a of the support column 5. The lower ends of the plurality of vertical ropes 7a and the both ends of the horizontal ropes 7b are anchored by appropriate means and disposed on the slope a. As shown in FIG. 1, it has a structure in which it is supported by being slightly inclined to the wire mesh 8 side with respect to the slope a.

Further, as shown in FIG. 3, the driving machine 11 has a cylindrical main body having a tapered outer diameter which can be inserted into the pipe anchor 1, and a reciprocating piston incorporated in the main body. Is driven forward or backward by, for example, compressed air, and the reciprocating piston gives a shock to the front end side or the rear end side of the main body to propel it in the ground b or to reverse the reverse direction. The driving tool of the mechanism has become known).

The pile foundation 10 shown in the figure comprises the pipe anchor 1, the resistance plate 2, the base plate 3 and the support pedestal 4 with the support mounting bolts 4a as described above. As shown in FIG. The driving machine 11 is housed, and the driving machine 11 is driven and controlled by an appropriate remote operation means (not shown) (the reciprocating piston in the main body is driven and controlled by the compressed air supplied from the pipe 11a), and the propelling force of the pipe drives the pipe. The anchor 1 is driven and driven into the ground b in a predetermined arrow direction X. That is, as shown in FIG. 1, at the upper part of the slope a, the pipe anchor 1 is easily and accurately driven into the ground b by the propulsive force of the driving machine 11 at a desired angle, and the base plate 3 on the upper part of the slope is inclined. When it comes into pressure contact with a, the driving tool 11 is pulled out upward and the pipe anchor 1
The lid 4b (filled with mortar or the like as necessary) is applied on the top of the lid for construction.

Further, the lower portion of the column 5 is pivotally attached to the column pedestal 4 on the base plate 3 by the column mounting bolts 4a to make a hinge connection 4a, and the column 5 is arranged so as to be tiltable in the inclination direction of the slope a. At the same time, the tip end of the suspension rope 6 connected to the head metal fitting 5a of the support column 5 with a connection metal fitting 6a (with a turn back) is anchored to the slope a by an appropriate means, and is attached to the upper part of the support column 5 as required. Bolt 9a
The tip end of the balance rope (one pair of right and left if necessary) 9 connected to the above is anchored to the slope a by an appropriate means, and the support column 5 is supported and built in a state of being slightly inclined downward as shown in the drawing, As described above, a plurality of columns 5 are arranged on the slope a with a horizontal interval.

Further, a plurality of vertical ropes 7a and horizontal ropes 7b are attached to the wire netting 8 and appropriate connecting fittings are provided to reinforce the wire netting 8 so that the upper portion of the wire netting 8 is attached to the upper portions of the columns 5 and the vertical ropes 7 are formed.
The lower part of the wire net 8 and the lower end and both ends of the horizontal rope 7b are anchored to the slope a by a suitable means and connected to the slope a by an appropriate height. a
As shown in the figure, the reinforced wire netting 8 held and reinforced is stretched in a pocket shape on the slope a, and the elastic supporting force of the wire netting 8 itself and the tilting of the column 5 effectively cause rock fall on the slope a. It is constructed in a rockfall protection net that buffers and receives.

The pile foundation 10 of the present invention is easily and accurately driven into the slope a by directing the pipe anchor 1 in the predetermined direction X by the propulsive force of the driving machine 11 as described above. A plurality of hammers are arranged at desired horizontal intervals on the slope a, and they are easily and efficiently constructed in a short time in safety work, and the ground b of the hammering portion is not disturbed and compacted, That pipe anchor 1
A strong frictional force is generated between the resistance plate 2 and the surrounding ground b over a wide range, and a strong reaction force in the arrow direction is generated due to the frictional force corresponding to the load N from the support column 5, and the base plate 3 is also arrowed. A strong support force corresponding to the load N is sufficiently secured by receiving a strong reaction force in the indicated direction, and the resistance plate 2 has a slope formed by the deviation angle α between the load N and the pipe anchor 1. By receiving a reaction force (reverse direction) in the arrow direction corresponding to the horizontal component force in the a direction, the tilting of the pile foundation 10 is effectively reduced, and the supporting force of the column is long-term in combination with the strong supporting force of the ground b. Stable and stable over a long period of time, excellent support performance and reliability of the pillar can be obtained. The resistance plate 2 is shown in FIG.
It is preferable to incline (120 to 70 °) with respect to the slope a and to bury it in the ground as shown in FIG. 7. With such an arrangement, the reaction force received by the resistance plate 2 is due to the tilting of the pile foundation 10. It works effectively as a levitation force as well as blocking.

Therefore, the accuracy of erection of the support columns 5, the tensioning accuracy of the wire netting 8 and the rockfall protection performance are improved and maintained for a long time, and the durability of the rockfall protection net is significantly improved.

In the illustrated example, the driving machine 11 is inserted into the pipe anchor 1 of the pile foundation 10 for propulsion, but the front part of the driving machine 11 is attached to the upper part of the pipe anchor 1 as required. Then, it is also possible to give a shock to the pipe anchor 1 and propel it into the ground b to drive it. Further, in the illustrated example, the wire net is stretched on the slope in the form of a pocket, but it is also possible to use a rock fall protection net stretched with the wire mesh so as to cover almost the entire slope.

[0021]

As described above, the pile foundation of the present invention is easily and accurately driven by driving the pipe anchor in a predetermined direction on the slope by the driving force of the driving machine, and the ground of the driven portion is exceptional. Is not disturbed by, but rather compacted,
The frictional force between the pipe anchor and the resistance plate and the ground increases remarkably, a strong reaction force corresponding to the load from the stanchions is generated, tilting is also effectively prevented, and the strong grounding is achieved in conjunction with the ground compaction. The support force of the column is stably maintained for a long period of time, and excellent column support performance and reliability are obtained. Therefore, the erection accuracy of the pillars and the tension of the wire mesh are improved, and their excellent rockfall protection performance is maintained for a long period of time. , The durability of the rockfall protection net has been remarkably improved.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of the present invention.

FIG. 2 is a front view (A), a side view (B) and a plan view (C) showing an embodiment of a pile foundation.

[Fig. 3] Side view mechanism diagram showing the driving state of the pile pipe anchor of the pile foundation in the ground

FIG. 4 is a plan view showing a conventional example.

[Explanation of symbols]

 1 Pipe Anchor 2 Resistance Plate 3 Base Plate 4 Support Post 4a Support Mounting Bolt 5 Support 6 Suspension Rope 7a, 7b Vertical and Horizontal Rope 8 Wire Mesh 9 Balance Rope 10 Pile Foundation 11 Slope a

Claims (2)

[Claims] 1. A pipe anchor that is driven on a slope by the propulsive force of a driving machine, a resistance plate that projects along both sides along the upper part of the pipe anchor, and the upper end of the pipe anchor and the upper edge of the resistance plate. A pile foundation structure for rockfall protection net columns, comprising a base plate fixed to the base and a column support pedestal with bolts for mounting columns fixed on the base plate. 2. The pile foundation structure for a rockfall protection net pillar according to claim 1, wherein said pile foundation is driven into a slope with a horizontal interval, and the pillars are hinge-connected to each pile foundation, and each pillar is also supported. The rockfall is characterized by the fact that the upper part of the wire mesh is supported and erected by hanging ropes, and the upper part of the wire mesh reinforced by vertical and horizontal ropes is connected to each pillar, and the lower part of the wire mesh is anchored to the slope and stretched. Protective net.