JPH0762967A - Reaming excavator - Google Patents

Abstract

PURPOSE:To concurrently perform the reaming work and the measuring work of the reamed hole diameter with the same device by obtaining the measured value of the reamed hole diameter from the slide quantity of an outer tube against an inner tube. CONSTITUTION:A hole is drilled with a casing 5, and the casing 5 is pulled up to the upper end of an expected reaming section after drilling is completed. A reaming device is inserted into the casing 5 while its expansion arms 3 are extended and stored until it reaches the expected reaming section. High-pressure water is sprayed from the nozzle of a nozzle box 12 for the reaming work. When a measurement section is lowered to the depth where reaming is started, a fixing device is removed, an outer tube 2 is pressed down by the force of a spring, and the expansion arms 3 are folded from middle sections 32 and expanded. Rollers 4 are pressed to the hole wall of the reamed hole, and the reamed hole diameter can be measured from the slide quantity of the outer tube 2. The reaming speed is adjusted from the measured value thus obtained, and drilling is continued to keep the specified reamed hole diameter. The work efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole drilling device.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a method for measuring the diameter of a hole to be drilled is to pull up a hole expanding device after the hole is expanded and insert a bag body b containing an ultrasonic sensor a into the hole. Then, a fluid c such as air is injected into the bag body b, and the ultrasonic sensor a measures the inner space dimension.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
There are the following problems. <A> After the completion of the hole expansion, the measurement operation is complicated because the measurement cannot be performed unless the hole expanding device is pulled up.

<B> When the measured value is less than the specified value, it is necessary to pull up the measuring device, insert the hole expanding device again, and perform the hole drilling work, resulting in a delay in the work.

<C> Since the fluid c must be injected after the bag b is inserted, and the fluid c must be withdrawn before the bag b is pulled up, the fluid c is injected or withdrawn. It takes a lot of work.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to perform the hole expanding work and the measuring work at the same time with the same device, and to improve the work efficiency. An object of the present invention is to provide a drilling device.

[0007]

That is, according to the present invention, an inner tube having a water injection nozzle at its tip, an outer tube axially slidably mounted on the inner tube, and an outer tube fitted to the tip of the outer tube are provided. In addition, the hole expanding digging device includes an expansion / contraction arm having an intermediate portion that can be bent outward and a roller equipped in the intermediate portion of the expansion / contraction arm.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. <A> Inner Tube (FIG. 1) The inner tube 1 is equipped with a nozzle box 11 having a nozzle 11 at its tip. There is a water supply channel inside the inner pipe 1,
The high pressure water flowing into the swivel 13 provided at the base end is configured to be jettable from the nozzle 11.

<B> Outer tube (FIG. 1) The outer tube 2 is a tube body which is slidably mounted on the inner tube 1 in the axial direction. The part is equipped with a spring 21. The spring 21
The outer tube 2 is urged in a direction to push it down. Further, a fixing device 22 for fixing the outer tube 2 to the inner tube 1 with a pin or a screw is provided on the base end side of the outer tube 2. Since the measured value of the diameter of the expanded hole is obtained by the sliding amount of the outer tube 2 with respect to the inner tube 1, the peripheral surface of the inner tube 1 on the proximal end side may be graduated.

<C> Expansion / contraction arm (FIG. 3) The expansion / contraction arm 3 is composed of an expansion / contraction arm 3 and a roller 4 mounted at the tip of the outer tube 2 and in front of the nozzle box 12. The expansion / contraction arm 3 has one end pivotally supported on the tip of the outer tube 2,
The other end is pivotally supported by a slide ring 31 slidably mounted on the inner pipe 1, and an intermediate portion 32 thereof is configured to be bendable to the outside. The number of expansion / contraction arms 3 is appropriately selected. In addition,
The tip end of the expansion / contraction arm 3 may be pivotally supported on the nozzle box 12.

<D> Roller The intermediate portion 32 of the expansion / contraction arm 3 has a roller 4 made of rubber or the like.
Equip. The roller 4 is configured to rotate around the shaft portion 41 at both ends of a shaft portion 41 attached to the intermediate portion 32 in parallel with the inner pipe 1.

[0012]

First, as shown in FIG. 2, the casing 5 is drilled, and after the drilling is completed, the casing 5 is pulled up to the upper end of the planned hole expansion portion. Next, the hole expanding device is inserted into the casing 5 to reach the planned hole expanding portion. In the hole expanding device, the outer tube 2 is fixed by the fixing device 22 in a pulled-up state, and the expanding / contracting arm 3 is extended and inserted.

Next, as shown in FIG. 1, high pressure water is jetted from the nozzle 11 to perform a hole expanding operation. When the measurement part has descended to the depth at which it started expanding the hole, remove the fixing device 22 and
Is pushed down by the force of the spring 21, and the expansion / contraction arm 3 is bent from the intermediate portion 32 and expanded. As a result, the roller 4 is pressed against the hole wall of the hole, so that the diameter of the hole can be measured from the sliding amount of the outer tube 2.

From the obtained measured value, the hole expanding speed and the like are adjusted, and the excavation is continued so that the specified hole expanding diameter is secured. After the expansion of the specified length is completed, the outer tube 2 is fixed to the casing 5 and the like, only the inner tube 1 is pushed down and fixed by the fixing device 22, and the expansion / contraction arm 3 is housed. Pull out to finish the work.

[0015]

Since the present invention is as described above, the following effects can be obtained. <A> The hole expanding work and the measuring work can be simultaneously performed by the same device, and the work efficiency can be improved.

<B> Even when the measured value is less than the specified value and the hole expanding operation is required again, the hole expanding operation can be immediately performed without pulling up the measuring device and inserting the hole expanding device.

<C> Injecting fluid into the bag as in the conventional case,
Since it is not necessary to perform the extraction work, the work can be simplified.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the entire apparatus of the present invention.

FIG. 2 is an explanatory diagram of an embodiment of the entire apparatus of the present invention.

FIG. 3 is an explanatory diagram of an embodiment of the main part of the apparatus of the present invention.

FIG. 4 is an explanatory diagram of a conventional technique.

Claims (1)

[Claims] 1. An inner tube equipped with a water injection nozzle at its tip, an outer tube axially slidably mounted on the inner tube, and an intermediate part attached to the tip of the outer tube that can be bent outward. A hole drilling rig consisting of an expansion / contraction arm and a roller mounted in the middle of the expansion / contraction arm.