JP4229253B2 - Lock bolt reinforcement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for reinforcing a lock bolt used in, for example, a slope stabilization method.
[0002]
[Prior art]
The applicant previously proposed Japanese Patent Application Laid-Open No. 11-36298 as a method for reinforcing a lock bolt used in a slope stabilization method or the like. This is filled with grout material between the lock bolt inserted into the hole drilled in the ground and the hole, and the lock bolt is provided with a reinforcing member up to a predetermined position in the hole. A holding jig for restricting the pulling-out of the pulling member attaching tool is inserted into the protruding tip, and the wire rope is attached to the pulling member attaching tool.
[0003]
[Problems to be solved by the invention]
In such reinforcement of the lock bolt, there is no problem as long as the wire rope is always stretched to the side, but there is unevenness in the natural ground, and the insertion direction of the lock bolt and the direction of the wire rope are not necessarily beside. Therefore, the U bolt may be bent and attached among the tension member fittings, and the U bolt has sufficient yield strength under tensile load, but the yield strength decreases when bending tension is applied, and a thick or strong material is used. The same problem with the lock bolts.
[0004]
Also, if there is a space between the ground and the lower part of the washer, even if it is a lock bolt with a reinforcement pipe, the lock bolt bends and deforms together with the reinforcement pipe, and a significant decrease in strength is recognized compared to the shear strength, Although the lower part of the washer is filled with mortar to reinforce, there is a problem in filling the mortar under the washer because the grout material fixes the washer together with the reinforcing pipe.
[0005]
This invention is made in view of this point, and it aims at providing the reinforcement method of the lock bolt which can overcome the said problem and can reinforce a lock bolt simply.
[0006]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, the present invention is configured as follows.
[0007]
The invention described in claim 1
“Drill the ground and fill it with grout,
Insert the lock bolt drilling of the grout material is filled,
Insert the washer on top of the lock bolt, abut the washer natural ground surface around the drilling,
Further, a reinforcing pipe fitted with an elastic ring is inserted from above the lock bolt, and the elastic ring is brought into contact with the washer,
After the grout has hardened, removing the said elastic ring washer around the rock bolt hole openings of the natural ground to flatten the size range of at least the washer with mortar,
Wherein again the washer onto the mortar and the elastic ring is attached to the reinforcing pipe to be positioned in order, the U-bolt mounting bracket sets orient the wire rope direction further on top of the elastic ring,
A method for reinforcing a lock bolt, wherein a presser is fitted and a fastening means is fastened to the upper portion of the lock bolt and fastened and fixed. ].
[0008]
According to the first aspect of the present invention, after the grout material is hardened using the other perforated lock bolt, the elastic ring and the washer for holding the reinforcing pipe are removed, and the periphery of the rock bolt hole hole in the natural mountain is removed. Since the mortar flattened at least the size of the washer, and it was attached to the reinforcement pipe so that the washer was positioned again on the mortar, and the space between the ground and the washer could be completely filled with mortar. Because the compressive force applied to the washer can be released to the ground, the apparent strength of the washer is improved due to the dispersion of the compressive stress on the ground from the strength of the washer only when the washer is floating above the ground. The bending strength of is improved.
[0009]
In addition, by setting the U bolt mounting bracket on the top of the washer so that the direction of the wire rope is aligned, the direction of the U bolt mounting bracket can be placed on a straight line with the wire rope, and bending force does not act on the tension member mounting bracket. , Can maintain stable proof stress.
[0010]
The invention described in claim 2
“Drilling the natural ground with rock bolts,
Filled with grout from the center hole of the lock bolt,
Insert the washer on top of the lock bolt, abut the washer natural ground surface around the drilling,
Further, a reinforcing pipe fitted with an elastic ring is inserted from above the lock bolt, and the elastic ring is brought into contact with the washer,
After the grout has hardened, removing the said elastic ring washer around the rock bolt hole openings of the natural ground to flatten the size range of at least washer with mortar,
Wherein again the washer onto the mortar and the elastic ring is attached to the reinforcing pipe to be positioned in order, the U-bolt mounting bracket sets orient the wire rope direction further on top of the elastic ring,
A method for reinforcing a lock bolt, wherein a presser is fitted and a fastening means is fastened to the upper portion of the lock bolt and fastened and fixed. ].
[0011]
According to the second aspect of the present invention, after the grout material is hardened using the self-drilling lock bolt, the elastic body ring and the washer for holding the reinforcing pipe are removed, and the periphery of the rock bolt hole hole in the natural ground is removed. Since the mortar flattened at least the size of the washer, and it was attached to the reinforcement pipe so that the washer was positioned again on the mortar, and the space between the ground and the washer could be completely filled with mortar. Because the compressive force applied to the washer can be released to the ground, the apparent strength of the washer is improved due to the dispersion of the compressive stress on the ground from the strength of the washer only when the washer is floating above the ground. The bending strength of is improved.
[0012]
In addition, by setting the U bolt mounting bracket on the top of the washer so that the direction of the wire rope is aligned, the direction of the U bolt mounting bracket can be placed on a straight line with the wire rope, and bending force does not act on the tension member mounting bracket. , Can maintain stable proof stress.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a method for reinforcing a lock bolt according to the present invention will be described below with reference to the drawings. First, FIG. 1 shows an embodiment of a method for reinforcing other perforated lock bolts.
[0014]
The natural ground 1 is drilled 2 and the grout 3 is filled in the drilled hole 2 (FIG. 1A). A lock bolt 4 is inserted into the hole 2 filled with the grout material 3 (FIG. 1B). A reinforcing pipe 7 having an elastic ring 6 attached to the upper part of the washer 5 is inserted from the upper part of the lock bolt 4 (FIG. 1 (c)). Then, after waiting for the grout material 3 to harden, the elastic ring 6 and the washer 5 are removed from the upper part of the reinforcing pipe 7, and at least the periphery of the rock bolt hole 1 a of the natural ground 1 is mortar 8. The range of the size of the washer 5 is flattened (FIG. 1 (d)).
[0015]
After that, the washer 5 and the elastic ring 6 are again mounted on the mortar 8 so that the washer 5 and the elastic ring 6 are positioned in this order, and the U-bolt fitting 9 is set in the direction of the wire rope. The fitting means 11 is screwed into the upper part of the lock bolt 4 and fastened and fixed (FIG. 1 (e)). Now, the placement of the lock bolt 4 is completed, and the lock net is completed by tensioning the wire rope to each other lock bolt 4 using the tension member attachment 12.
[0016]
FIG. 2 is a view showing completion of driving of the lock bolt, FIG. 3 is a view showing a reinforcing pipe, FIG. 4 is a view showing an elastic ring, and FIG. 5 is a view showing a presser.
[0017]
The reinforcing pipe 7 that can be inserted into the lock bolt 4 is formed shorter than the lock bolt 4. As shown in FIGS. 3 and 4, the elastic ring 6 attached to the upper portion of the reinforcing pipe 7 has a tapered surface 6a on the inner side, and the tapered surface 6a forms a small diameter portion 6b and a large diameter portion 6c. Has been. The elastic ring 6 is composed of a rubber ring, and is attached to the upper portion of the reinforcing pipe 7 from the large diameter portion 6c side, and is smoothly inserted into the small diameter portion 6b from the upper end opening of the reinforcing pipe 7 by the tapered surface 6a at the time of attachment. The small diameter portion 6b is pressed against the outer periphery of the reinforcing pipe 7 and is securely held at a predetermined position.
[0018]
Therefore, at the time of construction shown in FIG. 1C, the elastic ring 6 can be easily attached to the reinforcing pipe 7, and the reinforcing pipe 7 can be securely held in a state where the elastic ring 6 is attached to the reinforcing pipe 7. it can.
[0019]
As shown in FIG. 5, the U-bolt mounting bracket 9 is formed with a mounting portion 9b extending in one direction from a bracket main body 9a having an insertion hole 9a1, and the mounting portion 9b is formed with a mounting hole 9b1. As shown in FIG. 1 (e), the U-bolt mounting bracket 9 is fastened and fixed by the tightening means 11 by inserting the insertion hole 9 a 1 through the reinforcing pipe 7 and fitting the presser 10 during construction. A tension member attachment 12 is attached to the attachment hole 9b1 of the attachment portion 9b, and a wire rope is tensioned to the tension member attachment 12 to complete the lock net.
[0020]
Since the washer 5 is fixed using the elastic ring 6 for positioning the reinforcing pipe 7 in this way, after the fixing pipe 7 is fixed by the grout material 3, the washer 5 is removed and then the lock bolt hole 1 a of the mortar 8 is formed. Since the surrounding natural ground 1 can be shaped, both elimination of incomplete filling of the mortar 8 and improvement of workability can be achieved.
[0021]
Further, the inner shape of the elastic ring 6 is a tapered surface 6a having a small diameter portion 6b and the other large diameter portion 6c, or the inner shape may be a spherical shape, so that when inserted into the reinforcing pipe 7 However, since a large force is required when removing, the reinforcement pipe 7 can be easily attached to a predetermined position, and after the attachment to the lock bolt 4 embedded in the drilling hole 2. The tightening force is less likely to cause displacement.
[0022]
Further, since the elastic ring 6 is interposed between the washer 5 and the U-bolt mounting bracket 9, the elastic ring 6 is bent by tightening the lock bolt nut of the tightening means 11, and the tightening means 11 acts to prevent loosening. Also occurs.
[0023]
Further, since the U-bolt mounting bracket 9 is used and the tension member mounting bracket 12 is mounted on the U-bolt mounting bracket 9, the bending force does not act on the tension member mounting bracket 12 regardless of the unevenness of the ground 1 and is stable. Yield strength can be maintained.
[0024]
Also, since the mortar 8 can be completely filled in the space between the natural ground 1 and the washer 5, the compressive force applied to the washer 5 can be released to the natural ground 1, and the washer 5 floats from the natural ground 1. The apparent strength of the washer 5 is improved by the dispersion of the compressive stress to the natural ground 1 from the yield strength of the washer 5 only in the state, and as a result, the bending strength of the lock bolt 4 having the reinforcing pipe 7 is improved.
[0025]
Next, FIG. 6 shows an embodiment of a method for reinforcing a self-drilling lock bolt.
[0026]
A perforation claw 4a is provided at the tip of the self-drilling lock bolt 4, and the ground 1 is drilled 2 by the perforation claw 4a of the lock bolt 4 (FIG. 6A). The grout material 3 is filled into the hole 2 from the central hole 4b formed in the axial direction of the lock bolt 4 (FIG. 6B). A washer 5 is inserted into the upper part of the lock bolt 4, and a reinforcing pipe 7 fitted with an elastic ring 6 is inserted from the upper part of the lock bolt 4 (FIG. 6C). Then, after waiting for the grout material 3 to harden, the elastic ring 6 and the washer 5 are removed from the upper part of the reinforcing pipe 7, and at least the periphery of the rock bolt hole 1 a of the natural ground 1 is mortar 8. The range of the size of the washer 5 is flattened (FIG. 6D).
[0027]
After that, the washer 5 and the elastic ring 6 are again mounted on the mortar 8 so that the washer 5 and the elastic ring 6 are positioned in this order, and the U-bolt fitting 9 is set in the direction of the wire rope. The fastening means 11 is screwed onto the upper portion of the lock bolt 4 and fastened and fixed (FIG. 6 (e)). Now, the placement of the lock bolt 4 is completed, and the lock net is completed by tensioning the wire rope to each other lock bolt 4 using the tension member attachment 12.
[0028]
【The invention's effect】
As described above, in the invention according to the first aspect, after the grout material is hardened by using another perforated lock bolt, the elastic ring and the washer for holding the reinforcing pipe are removed, and the rock bolt hole hole of the natural ground is removed. Flatten at least the washer size range with a mortar around it, and attach it to the reinforcement pipe so that the washer is positioned again on this mortar, so that the space between the ground and the washer can be completely filled with mortar As a result, the compressive force applied to the washer was released to the ground, and the apparent strength of the washer was improved by the dispersion of the compressive stress on the ground from the strength of the washer only when the washer floated from the ground. The bending strength of the lock bolt is improved.
[0029]
In addition, by setting the U bolt mounting bracket on the top of the washer so that the direction of the wire rope is aligned, the direction of the U bolt mounting bracket can be placed on a straight line with the wire rope, and bending force does not act on the tension member mounting bracket. , Can maintain stable proof stress.
[0030]
In the invention according to claim 2, after the grout material is hardened using the self-drilling lock bolt, the elastic body ring and the washer for holding the reinforcing pipe are removed, and at least the periphery of the rock bolt hole hole of the natural mountain is mortar. The size range of the washer was flattened, and it was attached to the reinforcement pipe so that the washer was positioned again on this mortar, so that the space between the ground and the washer could be completely filled with mortar. As a result of increasing the apparent strength of the washer by dispersing the compressive stress on the ground from the strength of the washer only when the compressive force applied is released to the ground and the washer is floating above the ground, the bending strength of the lock bolt Will improve.
[0031]
In addition, by setting the U bolt mounting bracket on the top of the washer so that the direction of the wire rope is aligned, the direction of the U bolt mounting bracket can be placed on a straight line with the wire rope, and bending force does not act on the tension member mounting bracket. , Can maintain stable proof stress.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a method for reinforcing a lock bolt with another hole.
FIG. 2 is a diagram showing that the placement of the lock bolt has been completed.
FIG. 3 is a view showing a reinforcing pipe.
FIG. 4 is a diagram showing an elastic ring.
FIG. 5 is a view showing a pressing tool.
FIG. 6 is a view showing an embodiment of a method for reinforcing a self-drilling lock bolt.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground mountain 2 Drilling hole 3 Grout material 4 Rock bolt 5 Washer 6 Elastic body ring 7 Reinforcement pipe 8 Mortar 9 U bolt mounting bracket 10 Presser

Claims (2)

Drill the ground and fill it with grout material,
Insert the lock bolt drilling of the grout material is filled,
Insert the washer on top of the lock bolt, abut the washer natural ground surface around the drilling,
Further, a reinforcing pipe fitted with an elastic ring is inserted from above the lock bolt, and the elastic ring is brought into contact with the washer,
After the grout has hardened, removing the said elastic ring washer around the rock bolt hole openings of the natural ground to flatten the size range of at least the washer with mortar,
Wherein again the washer onto the mortar and the elastic ring is attached to the reinforcing pipe to be positioned in order, the U-bolt mounting bracket sets orient the wire rope direction further on top of the elastic ring,
A method for reinforcing a lock bolt, wherein a presser is fitted and a fastening means is fastened to the upper portion of the lock bolt and fastened and fixed. Drill a natural mountain with a lock bolt,
Filled with grout from the center hole of the lock bolt,
Insert the washer on top of the lock bolt, abut the washer natural ground surface around the drilling,
Further, a reinforcing pipe fitted with an elastic ring is inserted from above the lock bolt, and the elastic ring is brought into contact with the washer,
After the grout has hardened, removing the said elastic ring washer around the rock bolt hole openings of the natural ground to flatten the size range of at least washer with mortar,
Wherein again the washer onto the mortar and the elastic ring is attached to the reinforcing pipe to be positioned in order, the U-bolt mounting bracket sets orient the wire rope direction further on top of the elastic ring,
A method for reinforcing a lock bolt, wherein a presser is fitted and a fastening means is fastened to the upper portion of the lock bolt and fastened and fixed.

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