JP2549062B2 - Pipe rod construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sloped surface, a structure for a sloped surface, and a pipe rod construction method which is stably applied.

[0002]

2. Description of the Related Art When drilling holes for rock bolts on slopes that tend to collapse, when the rod for drilling is pulled out by the inner wall of the hole during the process of temporarily pulling out the rod for drilling and inserting the lock bolt. It collapses, and it becomes difficult to insert the lock bolt after that. Therefore, it is the current situation that the lock bolt steel material is forcibly pushed in by hitting with a hammer or the like.

[0003]

Therefore, the grout injection pipe attached to the rock bolt steel material is damaged at the tip or in the middle, and it becomes difficult to completely reach the inside of the drilled portion. In many cases, it will be damaged at the tip or in the middle, and it will not reach the inside of the drilled hole completely.

A method of driving the lock bolt from the beginning with a striking device or a hammer has also been used. However, the cement paste is sufficiently filled around the rock bolt, and the cement paste is filled in the voids loosened by drilling. Is required to be sufficiently press-fitted, especially the grout after the insertion of the rock bolt material in the reinforcement construction method is completely pressed sufficiently from the tip of the rock bolt material, cracks in the surrounding rock, Alternatively, a sufficient effect cannot be expected unless the gravel layer voids are sufficiently filled.

The present invention has been proposed in view of such circumstances, and an object of the present invention is to provide a pipe rod construction method which is improved in workability and is excellent in the ground stabilization effect.

[0006]

In order to achieve the above object, according to the pipe rod construction method of the present invention, a pipe rod having a drill bit at the tip thereof is removably fitted to the ground up to a predetermined depth. After penetrating, insert a rock bolt steel material attached with a grout injection pipe, separate the excavation bit from the pipe rod into the ground, withdraw the pipe rod, and inject grout from the grout injection pipe. is there.

[0007]

As described above, the present invention, as described above, penetrates the pipe rod in which the drill bit is detachably fitted to the tip to the predetermined depth of the natural ground, and then inserts the rock bolt steel material in which the grout injection pipe is attached, By removing the excavation bit fitted to the tip of the pipe rod from the pipe rod and burying it in the ground, the rock bolt, along with the grout injection pipe affixed to it, completes up to the tip of the hole drilled by the pipe rod. Arrives in a perfect shape.

Therefore, the pipe rod is pulled out and removed, and the grout is injected from the injection pipe, so that the grout is injected and filled over the entire drilled portion.

[0009]

The present invention will be described below with reference to the illustrated embodiments. Reference numeral 1 denotes a pipe rod, on the inner peripheral surface of which the tip end is tapered, the excavation bit 2 is fitted so as to be freely detachable and not to rotate together. 3 is a rock bolt steel material, and a grout injection pipe 4 is attached by a wire or the like.

Then, the pipe rod 1 is connected to the adapter 5
Via a hole drilling machine or a rock drilling machine, and the pipe rod 1 is penetrated to a predetermined depth of the natural ground 6 through the drilling machine or the rock drilling machine. (See FIG. 1) Then, the rock bolt steel material 3 with the grout injection pipe 4 is inserted into the pipe rod 1, and the rock bolt steel material 3 is struck by a struck means such as a hammer a or the rotation of the pipe rod 1 is performed. To disengage the excavation bit 2 from the pipe rod 1 (see FIG. 2), then pull out the pipe rod 1 and inject mortar or cement milk 7 from the injection pipe 4, and if necessary a packer or the like. Use pressure infusion. (See FIG. 3) Thus, after the grout is completed and cured, the bearing plate 8 and the nut 9 are used to tighten with a torque wrench or the like to a predetermined strength, and a predetermined head treatment is performed to complete the whole process. (Fig. 4
reference)

[0011]

As described above, according to the present invention, as described above, the pipe rod having the drill bit at the tip thereof is removably fitted into the pipe rod is penetrated to a predetermined depth, and then the grout injection pipe is attached to the pipe rod. Since the rock bolt steel material is inserted, it is possible to prevent the rock mass from collapsing into the drilled hole when the pipe rod is penetrated, and after the pipe rod penetrates to the predetermined depth of the rock mass, the rock bolt steel material is hit. , Or by rotating the pipe rod, the excavation bit fitted at the tip of the pipe rod is removed from the pipe rod and buried in the ground, the pipe rod is pulled out, and grout is injected from the grout injection pipe. Since the injection pipe is a complete type, it reaches the cutting edge of the pipe rod in the ground,
The grout is completely filled with the grout. In the meantime, sufficient pressure injection is possible by using a backer or the like together, and the voids in the peripheral portion of the drilled hole are sufficiently filled with grout by pressure, and the geology can be improved.

Further, according to the present invention, the work is simpler, more reliable, and more economical than the conventional method.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a natural hole drilling process using a pipe rod.

FIG. 2 is a vertical cross-sectional side view showing a step of removing an excavation bit at the tip of the pipe rod.

FIG. 3 is a vertical sectional side view showing a pipe rod drawing process and a grout injection process.

FIG. 4 is a vertical sectional side view showing a state at the time of completion of construction.

FIG. 5 is a vertical cross-sectional side view of a tip end portion of a pipe rod.

FIG. 6 is a view on the arrows in FIG.

FIG. 7 is a front view of a rock bolt steel material and a grout injection pipe.

[Explanation of symbols]

 1 Pipe Rod 2 Drill Bit 3 Rock Bolt Steel 4 Grout Injection Pipe 5 Adapter 6 Ground 7 Mortar or Cement Milk 8 Bearing Plate 9 Nut a Hammer

Claims (1)

(57) [Claims] 1. A pipe rod having a drill bit inserted at its tip so that it can be inserted into and removed from the ground rod is penetrated to a predetermined depth in the ground, and then a rock bolt steel material attached with a grout injection pipe is inserted, and the drill bit is piped. A pipe rod construction method characterized in that the pipe rod is detached from the ground, the pipe rod is pulled out, and the grout is injected from the grout injection pipe.