JP2014190150A - High-strength anchor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-strength anchor capable of obtaining stable pull-out strength without reference to an installation location, and a high-strength anchor capable of being also suitably used as a net holding anchor by having the high pull-out strength.SOLUTION: An high-strength anchor includes a pipe body 10 that is inserted into a hole P for installation of the anchor, and a wedge pipe 20 that is inserted into the hole P along the pile body 10. A surface, which is brought into contact with the wedge pile 20, of the pile body 10 is provided with an inclination 13 for pressing the pile body 10 against the side of a hole wall P1 in association with the contact with the wedge pile 20.

Description

  The present invention relates to a high-strength anchor, and preferably relates to a high-strength anchor suitable for a hard installation surface such as a rock or a concrete spray surface.

As a conventional technique, for example, a pin anchor shown in FIGS. 12 and 13 is known.
A pin anchor 100 shown in FIG. 12 is an anchor for a hard rock portion formed of hard rock. Further, the installation method will be described. After the hole P is drilled in the rock, the anchor 100 is inserted and fixed in the hole P. Specifically, after inserting the anchor 100 into the hole P, the anchor 100 is hit from its head, and the anchor 100 is bent and fixed in a dogleg shape. That is, the anchor 100 is bent by hitting, and the bent portion 101 bites into the hole wall P1 to obtain proof strength as an anchor.

  On the other hand, the pin anchor 200 shown in FIG. 13 is an anchor for a soft rock part, and the tip thereof is thicker and sagittal compared to other parts. Further, by pulling out the sagittal projection 201 while biting into the hole wall P1, the pulling strength is secured.

  By the way, among the anchors described above, in the anchor 100 that is used by bending the anchor in the hole, the anchor is caused to bite into the hole wall depending on the deformation thereof, so that the bite between the anchor and the hole wall is shallow and the pulling strength is increased. There are also variations.

  In addition, the anchor 200 having a sagittal projection at the tip is driven while the projection is biting into the hole wall, so that the installation surface is limited to a soft bedrock. Further, since the pullout strength depends only on the frictional force acting between the sagittal projection and the hole wall, the proof strength is insufficient in a place where a high load is applied.

  In addition, this type of anchor is often used as a net retainer anchor for a rockfall protection net. In the rockfall protection net, a large number of these anchors are used to fix the net to a slope. However, since the conventional anchor has low pullout strength, the net can only be pressed by a point. Depending on the terrain, the net may be lifted, or more than the number of anchors required for the design. Furthermore, the anchor must be properly used for the hard rock portion and the soft rock portion, and there is room for improvement in this respect.

  The present invention has been made in consideration of such technical problems, and an object of the present invention is to provide a high-strength anchor that can stably obtain a high pull-out strength regardless of the installation location. It is another object of the present invention to provide a high strength anchor that can be suitably used as an anchor for a net presser by having a high pulling strength.

In order to solve the above technical problem, the present invention provides:
A pile main body inserted into the hole for anchor installation, and a wedge pile inserted into the hole along the pile main body,
The contact surface of the pile main body with the wedge pile is provided with an inclination for pressing the pile main body toward the hole wall side in contact with the wedge pile.

  According to this invention comprised in this way, the anchor is comprised by the pile main body and the wedge pile. In addition, the pile body is provided with an inclination to press the pile body toward the hole wall side in contact with the wedge pile, and when the wedge pile is inserted along this inclination, the pile body is It is strongly pressed to the hole wall side by the effect. Therefore, a high contact pressure is generated between the hole wall and the anti-main body, and a high pulling strength as an anchor is obtained by this contact pressure.

  Moreover, the inclination for making the wedge effect act is provided not on the wedge pile side but on the pile main body side, and the wedge effect becomes higher toward the tip of the pile main body. That is, the pile body is firmly fixed at the bottom of the hole for anchor installation. Moreover, since a pile main body can be installed without roughening a hole wall, the stable yield strength is obtained also in this point. Furthermore, since the pile main body is fixed inside the hole after being inserted into the hole, it can be installed regardless of the soft rock part and the hard rock part.

  Moreover, the structure provided over the front-end | tip of the said pile main body may be sufficient as the contact surface which has the said inclination.

  In this structure, the contact surface which has an inclination is provided over the front-end | tip of a pile main body, and a pile main body is pressed to the hole wall side with the strongest pressure in the front-end | tip part. That is, the anti-main body is fixed with a stronger force at a deeper position in the anchor installation hole.

Moreover, the structure by which a protrusion is provided in the site | part pressed by the said hole wall of the said pile main body, and the contact surface which has the said inclination is provided in the back of the said protrusion may be sufficient.

  In this structure, in a pile main body, it has a protrusion in a contact part with a hole wall. An inclination for pressing the anti-main body toward the hole wall is provided behind the protrusion. For this reason, the protrusion provided on the anti-main body bites deeply into the hole wall as the pile main body is pressed by the wedge pile.

  Moreover, the structure by which both the edge parts of the said wedge pile were bent in the said pile main body side in use condition may be sufficient.

  In this structure, the both edges of the wedge pile are bent into the pile main body side. For this reason, when inserting a wedge pile into a hole along a pile main body, both edges of this wedge pile function as a guide rail, and a wedge pile is inserted straight without deviating from an anti-main body.

  Moreover, the structure provided with the guide for guide | inducing the said wedge pile along the pile main body in the said hole may be sufficient.

  In this structure, when inserting a wedge pile along a pile main body, a wedge pile can be correctly inserted by using this guide.

  The anchor may be an anchor for pressing a face material against an anchor installation surface, and the guide may have a shape that also serves as a pressing member that presses the face material.

 In this structure, a face material can be pressed on an anchor installation surface using the guide provided in this high proof stress anchor. In addition, preferably as a face material, a net of a rock fall protection net can be exemplified.

  As described above, according to the present invention, it is possible to provide a high-strength anchor capable of obtaining a stable and high pull-out strength regardless of the installation location. Further, by having a high pulling strength, it is possible to provide a high strength anchor that can be suitably used as an anchor for a net presser.

The front view which shows the installation state of the high yield strength anchor shown to this Embodiment. The top view which shows the installation state of the high yield strength anchor shown to this Embodiment. The side view which shows the installation state of the high yield strength anchor shown to this Embodiment. The front view of the pile main body shown to this Embodiment. FIG. 5 is a cross-sectional view taken along line AB in FIG. 4. The front view of the wedge pile shown in this Embodiment. Sectional drawing of the wedge pile shown to this Embodiment. The top view of the guide shown to this Embodiment. The principal part enlarged view of the guide shown to this Embodiment. Construction drawing before driving the wedge pile. Construction drawing after driving the wedge pile. The figure which shows the installation state of the conventional anchor for hard rock parts. The figure which shows the installation state of the conventional anchor for soft rock parts.

Hereinafter, an embodiment in which the high strength anchor 1 of the present invention is applied to a net press anchor for a rock fall protection net installed on a slope will be described.
In the present embodiment, the bedrock is described as an example of the place where the high strength anchor 1 is installed. it can.

  The high-strength anchor 1 shown in the present embodiment includes a pile main body 10 inserted into a hole P for anchor installation drilled on a slope, a wedge pile 20 inserted into the hole P along the pile main body 10, and It has a guide plate 30 for guiding the wedge pile 20 along the pile body 10 into the hole P.

  As shown in FIGS. 4 and 5, the pile body 10 is composed of a steel plate having a key-like stopper 14 at the head. Further, projections 11 and 12 are formed in the portion to be inserted into the hole P so as to bite into the hole wall P1 and generate pullout strength as an anchor.

  Specifically, among the parts to be inserted into the holes P for anchor installation, one at the tip portion of the pile body 10 (reference numeral 11 in FIG. 4), one slightly closer to the center (reference numeral 12 in FIG. 4), It has a total of two protrusions. Moreover, each protrusion 11 and 12 is provided in the site | part which opposes the hole wall P1, and the inclined surface 13 which presses the pile main body 10 to the hole wall P1 side with contact with the wedge pile 20 is provided in the back. It has been.

  That is, the protrusions 11 and 12 are formed at two upper and lower portions on one side edge 10a of the pile body 10, and the inclined surface 13 for causing the protrusions 11 and 12 to bite into the hole wall P1 is formed on the other side edge 10b. ing. In addition, the inclined surface 13 is continuous from the upper protrusion 12 to the lower protrusion 11, and referring to FIG. 4, the portion that exhibits a hem-extended appearance toward the tip of the pile body 10 is in contact with the wedge pile 20. This corresponds to a surface, that is, a contact surface having an inclination in the present invention.

  On the other hand, the wedge pile 20 inserted into the hole along the pile body 10 is formed of a steel plate having substantially the same length as the pile body 10. Moreover, the both edge parts 20a and 20b are bent along the centerline 23, and the wedge pile 20 has a C-shaped cross-sectional shape from the front end to the end. Moreover, the rigidity as the wedge pile 20 is ensured by bending both edge parts 20a and 20b in this way.

Next, the guide plate 30 will be described. The guide plate 30 is made of a metal plate in the same manner as the pile body 10 and the wedge pile 20 described above, and not only functions as a guide for the wedge pile 20 but also a presser for pressing the rock fall protection net against the slope. Also serves as a board.

  Moreover, the insertion port 31 for inserting the pile main body 10 through a plate with respect to the hole P for anchor installation is formed in the center part. In addition, with the pile body 10 inserted, a slight gap 32 is secured in the insertion port 31, and the wedge pile 20 is inserted into the hole P for anchor installation through the gap 32. Yes.

  Referring to FIG. 9 in detail, the insertion port 31 is a circular hole wider than the pile main body 10, and the hole shape and direction that the gap 32 exhibits in the state where the pile main body 10 is inserted into a fixed position are the wedge pile 20. It corresponds to the cross-sectional shape and the direction of. Further, in the balance between the pile main body 10 and the wedge pile 20, the central portion of the wedge pile 20 is concave with respect to the pile main body 10. That is, since both edge parts 20a and 20b of the wedge pile 20 are bent into the pile main body 10 side in the use state, when the wedge pile 20 is inserted into the anchor installation hole P through the gap 32 of the insertion port 31. The wedge pile 20 is guided to the bottom of the anchor installation hole P along the pile body 10 without deviating from the pile body 10.

Then, the construction procedure of the high strength anchor 1 described above will be described with reference to FIGS. 10 and 11.
First, the guide plate 30 that also serves as a press plate for the net N is placed on the net N. Subsequently, the pile body 10 is inserted into the anchor installation hole P through the insertion port 31 provided in the guide plate 30. Further, the guide plate 30 is pressed to the net N side by a key-like stopper 14 provided on the head of the pile body 10.

  Subsequently, the wedge pile 20 is inserted into the gap 32 of the insertion port 31 and driven while being hit. At this time, the tip portion 20c of the wedge pile 20 is driven along the inclined surface 13 of the pile body 10 as shown in FIG. For this reason, the wedge pile 20 functions as a wedge, and the pile main body 10 is strongly pressed to the hole wall P1 side as shown in FIG. Therefore, the protrusions 11 and 12 provided on the pile main body 10 bite into the hole wall P1, and other parts of the pile main body 10 are also strongly pressed toward the hole wall P1.

  When the wedge pile 20 is driven, the upper portion of the wedge pile 20 is always held by the guide plate 30 described above. Moreover, since both edge part 20a, 20b of the wedge pile 20 functions as a guide rail, the wedge pile 20 is driven straight without deviating from the pile main body 10. FIG.

Thus, according to the high-strength anchor 1 of the present invention, the protrusions 11 and 12 provided on the pile body 10 are pressed against the hole wall P1 side by the driving of the wedge pile 20 and bite deeply. Moreover, since the pile main body 10 is also strongly pressed by the hole wall P1 in the whole region by the wedge effect, a high frictional force is obtained in a contact part with the hole wall P1. Moreover, since the inclined surface 13 for acting the wedge effect is provided not on the wedge pile 20 side but on the pile main body 10 side, the pile main body 10 is firmly fixed even at the hole bottom for anchor installation. Therefore, a high pulling strength can be stably secured by these synergistic effects.

  Moreover, in the high strength anchor 1 of this invention, since the pile main body 10 can be installed without roughening the hole wall P1, and since the pile main body 10 is fixed inside a hole after being inserted in a hole, the hole wall P1 is The high strength anchor 1 can be installed without any construction loss regardless of whether it is a hard rock part or a soft rock part as long as it can stand by itself.

  Moreover, the net N can be pressed with a line from the point by obtaining such a high pulling strength. That is, since the guide plate 30 placed on the net N can simultaneously press down a plurality of locations of the net N with one anchor, the net can be brought into close contact with the slope. Further, since each of the members 10, 20, and 30 described above is formed by processing a metal plate, the molding of each part can be integrally formed by stamping or bending with a press. For this reason, each member can be manufactured at low cost without performing additional processing using a drill or the like.

  These effects are remarkably obtained when used as a net presser anchor for a rockfall protection net. In other words, in the construction of a rockfall protection net, a large number of anchors are installed over the entire slope, so reducing the number of anchors installed, unifying the types of anchors, and lowering the unit price of anchors greatly increases the construction cost. This leads to cost reduction. Thus, this high yield strength anchor 1 is very advantageous as an anchor for a net presser.

  Subsequently, two types of conventional anchors (for hard rock and soft rock) and the high strength anchor 1 of the present invention were compared in terms of pullout strength.

[Test Example 1]
The performance comparison results regarding the pullout strength are shown below.
1. Outline and purpose of the test The performance of the high strength anchor according to the present invention is evaluated.
2. Test body and test content Structure of test body A Test body No1 Conventional pin type hard rock anchor φ9 × 200mm
B Specimen No2 Conventional pin type soft rock anchor φ13 × 300mm
C Specimen No3 High Strength Anchor (Invention)
・ Pile body (thickness 4mm x width 6,5mm x total length 175mm)
・ Wedge pile (Thickness 3,2mm x Width 19mm x Length 170mm)
Test Method A tensile load was applied to the anchor, and the pulling force (KN) until the anchor was pulled out was measured.
3. Test results

A Specimen No1 Conventional pin type hard rock anchor Pull-out force 0,5, -2,0KN
B Specimen No2 Conventional pin type soft rock anchor Anchor pulling force 0,7-3,0KN
C Specimen No3 High-strength anchor Pull-out force 7,0-9,0KN
4). Evaluation It can be understood that the high-strength anchor of the present invention has a pulling strength that is about 3 to 4 times higher than that of a conventional anchor. Further, the pulling force is stable at 7,0-9,0 KN.
From this test result, it can be said that the stable strength of the high strength anchor according to the present invention was proved.

The embodiment described above is merely an embodiment of the present invention, and details thereof can be changed according to various specifications.
For example, in the above-described embodiment, the pile body 10 and the guide plate 30 are configured as separate parts, but may be fixed in advance by welding or the like. Further, when the guide plate 30 is not necessary, the guide plate 30 may be removed and the net may be directly fixed by the key-like stopper 14 provided on the head of the pile body 10.

  In the present embodiment, the high-strength anchor 1 of the present invention has been described as an anchor for pressing the net. However, the use of the anchor is not limited to pressing the net, and various face materials such as a sand scattering prevention sheet. It can also be used for fixing. Of course, it can also be used as an anchor for indwelling various ropes and structures.

DESCRIPTION OF SYMBOLS 1 High proof anchor 10 Pile main body 10a One side edge 10b of a pile main body Other side edge 11 of a pile main body Lower protrusion 12
Upper projection 13 Inclined surface 14 Stopper 20 Wedge pile 20a Wedge pile side edge 20b Wedge pile side edge 23 Wedge pile centerline 30 Guide plate 31 Insertion slot 32 Clearance 100 Hard rock part anchor 101 Bent part 200 Soft rock part Anchor 201 Sagittal projection P Hole P1 Hole wall N Net

Claims (6)

A pile main body inserted into the hole for anchor installation, and a wedge pile inserted into the hole along the pile main body,
A high-strength anchor having a slope for pressing the pile main body against the hole wall side in contact with the wedge pile on a contact surface of the pile main body with the wedge pile.   The high-strength anchor according to claim 1, wherein the contact surface having an inclination is provided over a tip of the pile body. 3. The height according to claim 1, wherein a protrusion is provided at a portion pressed against the hole wall of the pile body, and the contact surface having the inclination is provided behind the protrusion. Strength anchor.   The both ends of the said wedge pile are bent in the said pile main body side in use condition, The high strength anchor in any one of Claim 1 to 3 characterized by the above-mentioned.   The high-strength anchor according to any one of claims 1 to 4, further comprising a guide for guiding the wedge pile along the pile body into the hole. The high-strength anchor according to claim 5, wherein the anchor is an anchor for pressing a face material against an anchor installation surface, and the guide has a shape that also serves as a pressing member that presses the face material. .

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