JP2539888B2 - Anchor head support and construction method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an anchor head support part of a slope protection method for preventing collapse of an inclined slope and a method for constructing the same.

[Prior Art] Generally, for slope slopes, a slope protection method is known in which a ground anchor, a lock bolt, or the like is driven on a slope or retaining wall incorporating a reinforcing bar to stabilize the slope slope. (For example, see Japanese Patent Application No. 54-162066).

Further, in such a slope protection method, a guide hole is previously formed in the slope or retaining wall in order to drive the ground anchor, the lock bolt and the like.

FIG. 11 shows an anchor head support portion in which such a guide hole is formed.On the sloped surface 11, a sloped surface presser 15 made of a concrete column incorporating a reinforcing material 13 such as a reinforcing bar is formed. Has been done.

A guide hole 19 penetrating the surface portion 17 and the slope contact portion 18 of the inclined slope retainer 15 is formed by a sleeve member 21 made of a vinyl chloride pipe.

An anchor cable 23, which is a ground anchor whose one end is fixed to the deep part of the ground, is inserted through the guide hole 19.

Further, the surface part 17 of the inclined slope presser 15 is shaped into a flat shape and the anchor head 24 is arranged. The other end of the anchor cable 23 is tightly bound by the anchor head 24, and the inclined slope retainer 15 is pressed toward the inclined slope 11 side.

In the anchor head support portion thus configured, the ground anchor is placed using the guide hole 19 formed at an arbitrary position of the slope slope retainer 15 and the slope slope retainer 15 is formed.
The anchor cable 23 is tightly bound by the upper anchor head 24 in a state in which a tensile force is applied to the anchor cable 23, and the slope slope retainer 15 is pressed toward the slope slope 11 side.

Conventionally, the construction of such an anchor head supporting portion is first carried out by providing a large number of reinforcing members 13 on the inclined slope 11 as shown in FIG.
Is formed by forming a frame 25 of the inclined slope retainer 15 and inserting a sleeve member 21 made of a vinyl chloride pipe into the position where the ground anchor is placed inside the frame 25. Then, the sleeve member 21 is fixed to the reinforcing member 13 by the binding member 26 such as annealed iron wire having high strength in consideration of the driving angle of the ground anchor.
As shown in FIGS. 13 and 14, the sleeve member in the mold 25
After the mortar 27 is sprayed on the outer peripheral portion of the 21 and the mortar 27 is cured, the ground anchor insertion hole is drilled by a drilling machine using the guide hole 19 formed inside the sleeve member 21. The anchor cable 23 is inserted. The tip portion of the anchor cable 23 is fixed deep in the ground, and the anchor head 24 is arranged on the guide hole 19.

After that, the anchor cable 23 is tightly bound to the anchor head 24 in a state in which a tensile force is applied to the anchor cable 23, and the inclined slope retainer 15 is pressed toward the inclined slope 11 side to construct an anchor head support portion. .

Therefore, in the anchor head supporting portion configured as described above, a tensile force is applied to the anchor cable 23 by the anchor head 24 above the inclined slope retainer 15, whereby the inclined slope retainer 15 is on the inclined slope 11 side. Since it is pressed against, it is possible to prevent the slope 11 from collapsing.

[Problems to be Solved by the Invention]

However, in such a conventional anchor head supporting portion, the sleeve member 21 made of a vinyl chloride pipe is used.
When the mortar 27 is sprayed on the outer peripheral part of the mortar 27, since the air at the time of spraying does not pass through the sleeve member 21, the rebound of the mortar 27 at the time of spraying becomes large, as shown in FIG. 13, and as shown in FIG. As described above, there is a problem that the void 28 is generated in the outer peripheral portion of the sleeve member 21 and the mortar 27 does not effectively adhere to the sleeve member 21. Therefore, the anchor head
There is a problem that the strength in the vicinity of the guide hole 19 supporting the 24 is reduced, and when a tensile force is applied to the anchor cable 23, the vicinity of the guide hole 19 may be broken.

Also, due to the cut slope of the slope 11, etc., the slope slope retainer 15
And the anchor angle of the ground anchor may be different. In this case, as shown in FIG. 12, the sleeve member 21 made of a vinyl chloride pipe is arranged at the anchor angle of the ground anchor, and the sleeve member 21 A spacer 29 such as a concrete block is held in a gap between the reinforcing member 13 and the vicinity thereof, and the outer periphery of the sleeve member 21 is rotated by a binding member 29 such as annealed iron wire having high strength to bind and fix the guide hole. 19 There is a problem that it takes time to form.

Further, after spraying, the guide hole 19 of the slope slope retainer 15
The anchor head 24 is arranged on the upper side, and in order to apply a tensile force to the anchor cable 23, a surface portion near the guide hole 19
Although it is necessary to shape 17 into a flat shape, the sleeve member 21 made of a vinyl chloride pipe, which is difficult to process, projects above the surface portion 17, so that the entire circumference of the vinyl chloride pipe is, for example, a gold saw or the like. Therefore, it is necessary to cut and shape with a grinder or the like, and it is difficult to shape the surface portion 17 near the guide hole 19 into a flat shape.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to easily form the guide hole and easily shape the surface portion near the guide hole. It is an object of the present invention to provide an anchor head support part capable of improving the strength near the guide hole and a method for constructing the same.

[Means for solving the problem]

In order to achieve the above object, the anchor head support portion in the present invention forms an inclined slope retainer incorporating a reinforcing material on an inclined slope and penetrates the surface portion and the slope contact portion of the inclined slope retainer. Through the sleeve member, thereby forming a guide hole, through which a tension member whose one end is fixed deep in the ground is inserted, and which is disposed on the surface portion of the inclined slope retainer. The other end of the tension member is tightly bound to the anchor head, and the sleeve member is formed of a mesh pipe in an anchor head support portion formed by pressing the inclined slope retainer toward the inclined slope.

Further, in the method of constructing the anchor head support portion in the present invention, a large number of reinforcing members are arranged on the sloped surface, and the net pipe is arranged between these reinforcing members in the deep underground direction, and The mesh pipe is fixed to the reinforcing member by utilizing the mesh of the mesh pipe, the mortar is sprayed on the outer peripheral portion of the mesh pipe to form the slope slope retainer, and the surface portion and the slope contact of the slope slope retainer are formed. After forming a guide hole that penetrates the part,
A state in which a tension member, one end of which is fixed deep in the ground, is inserted into this guide hole, an anchor head is arranged on the surface portion of the inclined slope retainer, and then a tensile force is applied to the tension member. Then, the other end of the tension member is tightly bound to the anchor head, and the inclined slope retainer is pressed to the inclined slope side to construct the construction.

[Action]

In the anchor head support portion of the present invention, since the sleeve member is formed of the mesh pipe, when spraying the mortar, air at the time of spraying passes through the sleeve member, so that rebound of the mortar is suppressed and the sleeve member and the mortar are suppressed. Adhesion with is promoted.

Further, in the construction of the anchor head supporting portion of the present invention, a large number of reinforcing materials are arranged on the sloped surface, and the mesh pipe is arranged between these reinforcing materials toward the deep underground direction. Is fixed to the reinforcing material using the mesh of the mesh pipe, mortar is sprayed on the outer periphery of this mesh pipe to form a slope slope retainer, and the slope slope retainer penetrates the surface part and slope contact part. A guide hole is formed, one end of which is fixed in the deep part of the ground is inserted into the guide hole, the anchor head is placed on the surface of the slope slope retainer, and the tensile force is applied to the tension member. The other end of the tensile member is tightly bound to the anchor head, and the inclined slope retainer is pressed toward the inclined slope.

〔Example〕

Hereinafter, the details of the anchor head support portion and the construction method thereof according to the present invention will be described with reference to the drawings.

FIG. 1 shows one embodiment of the anchor head support portion of the present invention, in which reference numeral 31 denotes a sloped surface composed of a cut slope or a natural state slope. On this slope 31,
An inclined slope retainer 33 made of a concrete column is formed, and the inclined slope retainer 33 incorporates a reinforcing material 35 made of, for example, a reinforcing bar.

As shown in FIG. 2, the inclined slope retainer 33 is formed on the inclined slope 31 in a lattice shape, and a slope 37 is formed.

Further, as shown in FIG. 1, the inclined slope retainer 33 has a guide hole 43 penetrating the surface portion 39 and the slope contact portion 41 thereof.
Are formed. The guide hole 43 is formed by spraying mortar onto the outer peripheral portion of the sleeve member 45. As shown in FIG. 3, the sleeve member 45 is formed by forming a metal wire net, in which thin iron wires 46 are arranged in a grid, in a cylindrical shape.

Then, in the guide hole 43, a tension member 47 made up of an anchor cable having one end fixed to the deep underground is inserted.

Further, the surface portion 39 of the inclined slope presser 33 is shaped into a flat shape,
An anchor head 49 is arranged on the surface portion 39.
The anchor head 49 is composed of an anchor head main body 51 that binds the tension member 47 in a state where a tension force is applied, and a pressure support plate 53 that supports the reaction force of the tension member 47 on the inclined slope retainer 33.

With the anchor head support portion configured as described above,
Since the sleeve member 45 is formed by the wire mesh pipe, when spraying the mortar, the air at the time of spraying is the sleeve member.
The rebound of the mortar is suppressed after passing through 45, and the adhesion between the sleeve member 45 and the mortar is promoted.

In constructing such an anchor head supporting portion, first, as shown in FIGS. 4 and 5, a form 55 of an inclined slope retainer 33 in which a large number of reinforcing members 35 are incorporated in the inclined slope 31 is formed. The sleeve member 45 made of a wire mesh pipe is inserted into the ground anchor driving position.

This sleeve member 45 is bound and fixed to the reinforcing member 35 by inserting the mesh of the wire netting pipe with a binding member 54 such as a binding wire having low strength in consideration of the driving angle of the ground anchor. Then, in this state, as shown in FIG. 6 and FIG. 7, mortar 57 is sprayed on the outer peripheral portion of the sleeve member 45 in the form 55, so that the form 55 is so-called buried and the mortar is removed.
After the hardening of 57, as shown in FIGS. 8 and 9, the inclined slope retainer 33 is formed. A guide hole 43 is formed inside the sleeve member 45. After this, the thin iron wire 46 of the sleeve member 45 made of a metal mesh pipe protruding on the surface 39 of the inclined slope presser 33 is cut by a hand cutter or the like to shape the surface 39 flat. .

Next, the guide hole formed by the sleeve member 45
As shown in FIG. 10, the tension material insertion hole 58 is drilled by the hole drilling machine 59 using 43, and the tension material 47 is inserted into the insertion hole 58 as shown in FIG. It The tip of the tension member 47 is fixed deep in the ground, and the anchor head 49 is arranged on the guide hole 43. After that, with the tensile force applied to the tension member 47, the tension member 47 is attached to the anchor head 49.
Is tied up, and the inclined slope retainer 33 is pressed toward the inclined slope 31 side to construct an anchor head support portion.

Then, in the anchor head supporting portion configured as described above, since the sleeve member 45 is formed of the metal mesh pipe, the adhesion of the sleeve member 45 and the mortar 57 is promoted, and the vicinity of the guide hole 43 that supports the anchor head 49. The strength of can be improved, and accordingly, the destruction of the vicinity of the guide hole 43 when applying a tensile force to the tensile member 47 can be reliably prevented.

Further, according to the method of constructing the anchor head supporting portion as described above, since the guide hole 43 is formed by the wire netting pipe, the sleeve member 45 is provided with a binding member 54 such as a binding wire having low strength in the mesh. It can be inserted and fixed to the reinforcing member 35 easily and surely. With this,
A conventional spacer for position fixing is used as a sleeve member 45.
It is possible to omit the work step of arranging it in the gap between the reinforcing member 35 and the reinforcing member 35.

Furthermore, according to the method of constructing the anchor head support portion as described above, in order to shape the surface portion 39 into a flat shape, the surface portion
39 Sleeve member consisting of wire mesh pipe protruding above 45
It suffices to cut the small-diameter iron wire 46 of with a hand cutter or the like, and it is not necessary to scrape and shape the entire circumference of the vinyl chloride pipe with a gold saw, a grinder, etc.
The surface portion 39 near the guide hole 43 can be easily shaped.

Furthermore, since the tension material insertion hole 58 is drilled, if the diameter of the drilling bit is larger than the guide hole 43,
Conventional sleeve member made of vinyl chloride pipe
If 45 is used, there is a risk that the sleeve member 45 will become an obstacle and cannot be drilled, but in the present invention,
Since the sleeve member 45 is a wire mesh pipe, even if the diameter of the bit is larger than the guide hole 43, it is possible to easily drill a hole.

In addition, in the above-mentioned embodiment, an example in which the wire netting pipe of the sleeve member 45 is constituted by a thin iron wire has been described, but the present invention is not limited to the above-mentioned embodiment, and the sleeve member
Even if 45 is composed of a large diameter iron wire, it is possible to obtain substantially the same effect as in the above-mentioned embodiment, and also act as a reinforcing member near the guide hole 43.
The strength in the vicinity can be further improved.

Further, in the above embodiment, an example in which the sleeve member 45 is a metal mesh pipe has been described, but the present invention is not limited to the above embodiment, and for example, a resin mesh pipe is substantially the same as the above embodiment. The effect of can be obtained.

Further, in the above embodiment, the legal framework for the slope protection method is used.
Although the example of constructing the anchor head support portion in 37 has been described, the present invention is not limited to the above embodiment,
Of course, the anchor head support portion may be constructed on the retaining wall in the slope protection method.

Furthermore, in the above embodiment, an example in which the ground anchor is driven on the anchor head support portion has been described, but the present invention is not limited to the above embodiment, and a lock bolt is driven on the anchor head support portion. Of course, it is okay.

〔The invention's effect〕

As described above, in the anchor head support portion of the present invention, since the sleeve member is formed of the mesh pipe, when spraying mortar, air during spraying passes through the sleeve member and rebound of the mortar is suppressed, Adhesion between the sleeve member and the mortar is promoted, and the strength in the vicinity of the guide hole that supports the anchor head can be improved, and along with this, the destruction in the vicinity of the guide hole when applying tensile force to the tensile material is ensured. Can be prevented.

Further, in the method of constructing the anchor head support portion of the present invention,
A large number of reinforcing materials are arranged on the slope, and the mesh pipes are arranged between these reinforcing materials in the direction of the deep underground, and this mesh pipe is used as a reinforcing material by utilizing the mesh of the mesh pipe. Fix it, spray mortar on the outer peripheral part of this mesh pipe to create an inclined slope retainer, form a guide hole that penetrates the surface part and slope contact part of this inclined slope retainer, and then in this guide hole , One end is inserted through the tension member fixed in the deep part of the ground, the anchor head is placed on the surface of the inclined slope retainer, and then the other end of the tension member is applied with tension applied to the tension member. Is tied to the anchor head and the inclined slope retainer is pressed to the inclined slope side, so using the mesh of the mesh pipe, for example, a reinforcing member can be easily attached to the reinforcing material by a binding member such as a binding wire with low strength. And it can be securely bound and fixed,
Along with this, the guide hole can be easily formed in the inclined slope retainer, and the mesh pipe can be cut with a hand cutter or the like to easily shape the surface portion near the guide hole.

[Brief description of drawings]

FIG. 1 shows an anchor head support portion according to the present invention, and is a vertical cross-sectional view taken along the line II of FIG. FIG. 2 is a perspective view showing a method frame in which the anchor head support portion according to the present invention is formed. FIG. 3 is a perspective view showing a sleeve member of the anchor head support portion of FIG. FIG. 4 is a plan view showing a state in which the sleeve member is fixed to the reinforcing material. FIG. 5 is a vertical sectional view of FIG. 6 and 7 are explanatory views showing a state in which mortar is sprayed on the outer peripheral portion of the sleeve member. 8 and 9 are longitudinal sectional views showing a state in which the inclined slope presser is formed by spraying. FIG. 10 is an explanatory view showing a state in which the tensile member insertion hole is drilled using the guide hole. FIG. 11 is a vertical sectional view showing a conventional anchor head support portion. 12 to 14 are explanatory views showing the steps of a conventional method of constructing an anchor head support portion. [Explanation of symbols for main parts] 31 …… Inclined slope 33 …… Inclined slope presser 35 …… Reinforcement 39 …… Surface part 41 …… Slope contact part 43 …… Guide hole 45 …… Sleeve member 47 …… Tensile material 49 …… Anchor head 57 …… Mortar

Claims (2)

(57) [Claims] 1. An inclined slope retainer incorporating a reinforcing member is formed on an inclined slope, and a sleeve member is inserted through a surface portion and a slope contact portion of the inclined slope retainer, whereby a guide hole is formed. In this guide hole, a tension member whose one end is fixed deep in the ground is inserted, and the other end of the tension member is tightly bound to the anchor head arranged on the surface portion of the inclined slope retainer. In the anchor head support portion formed by pressing the inclined slope retainer toward the inclined slope surface side, the sleeve member is formed of a mesh pipe. 2. A large number of reinforcing materials are arranged on a sloped surface, and a mesh pipe is arranged between these reinforcing materials in the direction of the deep underground, and the mesh pipe is used as a mesh of the mesh pipe. Then, it is fixed to the reinforcing member, mortar is sprayed on the outer peripheral portion of the mesh pipe to form an inclined slope retainer, and a guide hole is formed to penetrate the surface portion of the inclined slope retainer and the slope contact portion. After that, a tension member whose one end is fixed deep in the ground is inserted into this guide hole, an anchor head is arranged on the surface portion of the inclined slope retainer, and then a tensile force is applied to the tension member. In the state described above, the other end of the tension member is tightly bound to the anchor head, and the inclination slope retainer is pressed toward the inclination slope face side.