JPS6245955B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a relay rod and a completion rod for a rock drill.

When a rock drill is used to excavate an area with weak soil, a hardening agent is injected through a hole previously drilled by the rock drill to strengthen the soil before continuing excavation. In other words, the intermediate completion rod used at this time drills a hole in the ground, then pulls it out, inserts a new pipe into the hole created by the excavation, and supplies the soil hardening agent through this pipe. etc. are injected. Therefore, when the soil hardening agent consists of two liquids, it is necessary to insert two pipes in order to inject the two liquids. In addition, in this case, when the rod is pulled out, the originally soft ground collapses and the hole that has been painstakingly drilled is blocked, so the pipe often cannot be inserted deep enough. This was a particular problem in the case of a curing agent that required two liquids.

SUMMARY OF THE INVENTION Therefore, the present invention provides an improved rock drilling rod that can solve the difficult problems encountered with conventional rock drilling machines, especially when excavating soft ground. Its purpose is to obtain.

In the present invention, in order to achieve this objective, at least two
After drilling holes in the ground using this rod, the rod can be used as is and two liquids, such as a two-part hardener, can be simultaneously pumped through these holes. It is characterized by being able to do the following.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 to 4 of the accompanying drawings showing embodiments thereof.

First, as shown in Figures 1 and 2, the main body part 1 of the completed rock drill rod or relay rod 1 is provided with threaded parts ₁₁ and ₁₂ at both ends.
Two recesses 2 and ₃ are formed in the outer peripheral surface of the rod 3 in a straight line in the axial direction symmetrically with respect to the center line of the rod. In addition, the main body part ₁₃ is tightly covered with a pipe 4 having an appropriate thickness except for threaded parts ₁₁ and ₁₂ formed at both ends thereof, and a recess 2 formed in the main body part ₁₃ is provided. , 3 and the inner wall of the pipe 4 form two through holes 5, 6. In addition, the center hole 7 penetrates through the center of the main body part ₁₃ in the longitudinal direction as in the conventional art.

In this embodiment, the recesses 2 and 3 formed on the outer peripheral surface of the main body portion ₁₃ are shown as having an arc shape, but instead, as shown in FIG. The notches 2' and 3' may be formed in the shape of the shape. Further, in these figures, the cross-sectional shape of the main body portion ₁₃ is shown to be circular, but it may be hexagonal. In that case, the cross-sectional shape of the pipe 4 is The corresponding one shall be selected. Furthermore, in these _embodiments , two through holes 5,
6 is formed, but the number of through holes may be one, or two or more.

Since the present invention has such a configuration,
When excavating soft ground, etc., attach this relay rod or completed rod 1 to a rock drill, connect a bit to its tip as appropriate, and drill a hole through the bit by driving the rock drill. After that, in that state, remove the main body part 1 of the completed rod or relay rod 1.
The two liquids constituting the soil hardening agent are passed through the main body portions ₁ and 3 of the relay rod or the completed rod 1 through the central hole 7 at the center of the rod 3 and the through holes 5 and ₆ formed on the outer peripheral surface thereof, respectively. , can be supplied to the part of the bit attached to its tip.

In this way, according to the present invention, even when excavating soft ground, the soil hardening agent can be supplied through the rod in that state after drilling with a rock drill, which is easier than conventional methods. This eliminates the various difficulties that arise when a new pipe is inserted to supply soil hardening agent after drilling a hole, pulling out the completed rod, etc., as in the drilling method of
Therefore, it becomes possible to significantly improve excavation efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal cross-sectional view showing an example of the present invention applied to a relay rod, FIGS. 2 and 3 are cross-sectional views taken along lines - and - in FIG. 1, respectively, and FIG. 2 shows another embodiment of the present invention.
3 is a cross-sectional view corresponding to the figure. 1...Rod; 1 ₁ , 1 ₂ ...Threaded part; 2,
3... Recess; 2', 3'... Notch; 4... Pipe; 5, 6... Through hole; 7... Center hole.

Claims (1)

[Scope of Claims] 1. In a rock drilling rod, in addition to the central hole that is drilled through the center of the main body in the longitudinal direction, at least one other hole is additionally provided in the longitudinal direction of the main body. The hole is formed so as to penetrate through the main body by a recess formed in the longitudinal direction on the outer peripheral surface of the main body and an inner wall of a pipe attached to the main body so as to tightly cover the recess. Rods characterized by. 2. The rod according to claim 1, wherein two other holes are provided symmetrically with respect to the center line of the main body portion. 3. The rod according to claim 1 or 2, wherein the recess has an arcuate cross section. 4. The rod according to claim 1 or 2, wherein the recess is formed by a linear notch.