JP3450530B2 - Downward drilling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for drilling a downward hole having a relatively small diameter, such as a vertical shaft for bridge pier construction in the construction and repair of viaducts for railways and highways, and a hole for reinforcing bridge piers. The present invention relates to a downward drilling device suitable for use in a.

[0002]

2. Description of the Related Art A conventional method for drilling a vertical shaft for construction of a bridge pier or the like is to pierce a pilot hole of a predetermined depth with a rock drill and then crush it by blasting or the like. The perforation method in this case is a method of manually perforating using a rock drill (hand hammer) or a caterpillar.
The method of using a chlora drill equipped with a traveling system has been adopted.

Of these methods, the method of punching by human power has a problem that the work efficiency is low and much labor is required. On the other hand, the method using the above-mentioned chlor drill has a problem that since the apparatus itself is large-scaled, it is not possible to drill a small-diameter vertical shaft. There is a problem in that a large crane device is required for loading and unloading the Ladrill apparatus into the vertical shaft. In addition, the traveling device often interferes with the formation of a portion where the hole cannot be formed.

As a means for solving the above-mentioned problems, a dedicated machine equipped with a rock drill on a small caterpillar type hydraulic excavator dolly, a so-called mini hydraulic excavator equipped with the rock drill, and the like are also used. However, although these devices are smaller than the chlora drill device, they are still large, heavy and expensive, and there is a problem that another truck is required for loading and unloading on site. It was Further, even with these devices, the diameter of the vertical shaft to be drilled is limited, and it is impossible to drill a very small one. Further, it is the same as the above-mentioned crawler device in that the crane is required for loading and unloading into the vertical shaft, and the traveling device interferes with a portion that cannot be drilled.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned problems in the conventional vertical hole drilling device, and provides a lightweight and compact downward hole drilling device suitable for the drilling of a vertical shaft having a relatively small diameter. The challenge is to provide.

[0006]

In order to solve the above problems, the present invention employs the following configurations. That is, in the downward drilling device according to the present invention, the rock drill is movably mounted vertically on the surface side of the guide cell provided with a fitting that can be suspended in the automobile crane at the upper end. A feeding device for moving the rock drill up and down is provided, a foot pad for fixing the guide cell by pressing it against the floor is provided at the lower end of the guide cell, and the rock drill is provided at the back of the guide cell. The feature is that a balance weight is attached to prevent the guide cell from tilting due to the weight of the machine.

If a metal fitting is provided on the surface side of the guide cell of this device so as to abut against the wall surface and keep a constant distance from the wall surface, it is convenient when, for example, a pier is constantly drilled at a constant position. is there.

[0008]

The hook of the automobile crane is hooked on the fixture, and the guide cell is held vertically while being suspended.
In this case, the foot pad is pressed against the floor surface. Further, the drilling machine is held in a state of being lifted to the upper part of the guide cell, a drilling rod is attached to the tip end thereof, and a lock bit is attached to the tip end of the drilling rod. In this state, the rock drill is operated, and the feed device applies downward thrust to perform drilling.

Since the guide cell is suspended by the crane, it can be easily moved to a desired drilling position. Further, since the weight of the rock drill and the balance weight is applied to the guide cell, the guide cell is prevented from rising due to the reaction of the rock drill.

[0010]

EXAMPLES Examples of the present invention will be specifically described below. In this downward punching device 1, a head plate 3 is fixed to the upper end of a guide cell 2 which constitutes the main body of the device, and a feeding device 5 is mounted on the head plate 3.

The guide cell 2 comprises two channel steels (channels) 2a, 2a fixed back to back with a slight gap. The head plate 3 clamps and fixes the two grooved steels with bolts. On the back side of the head plate 3, a bracket 7 having arm portions 4 and 4 projecting to the left and right sides is fixedly attached to the guide cell 2 and provided on the arm portion of this bracket. Bolt-shaped fittings 10, 10 are screwed onto the nuts 9, 9.

The metal fitting 10 is projected to the surface side at right angles to the longitudinal direction of the guide cell, and the length of the projection can be freely adjusted by turning the square bar portion 10a at the rear end with a wrench.

The feeding device 5 comprises a feed motor 12 and a speed reducer 13. A sprocket 14 fixed to an output shaft 13a of the speed reducer and a sprocket 16 of a drive shaft 15 are connected by a chain 17. A drive sprocket 19 is attached to an intermediate portion of the drive shaft 15, and a feed chain 23 is stretched around the sprocket and a sprocket 21 attached to a shaft 20 provided below the guide cell 2.

A carriage 25 slidably attached to the guide cell 2 is fixed to the feed chain 23. A rock drill 30 is attached to the carriage 25. Therefore, when the feed motor 12 is rotated in the normal and reverse directions, the carriage 25 carrying the rock drill 30 moves up and down along the guide cells.

A balance weight 35 is attached to the lower rear surface side of the guide cell 2 with bolts 36, .... The balance weight 35 has a weight that is appropriately balanced with the weight of the rock drill 30 on the front surface side, but it is not necessarily the same as the weight of the rock drill. A foot pad 37 is fixed to the lower end of the balance weight 35 so as to project slightly below the end of the guide cell. At the position where the balance weight 35 is attached, a bracket 40 having arm portions 39, 39 protruding laterally to the left and right is fixed to the guide cell, and a nut 41 provided at the arm portion. , 41, and fittings 42, 42 similar to the above are screwed. The length of protrusion of this metal fitting to the surface side can be adjusted in the same manner as above.

At the lower end of the guide cell 2 is a centrizer.
50 is attached. The centralizer 50 has pivot arms 53, 53 attached to shafts 52, 52 provided at both left and right ends of a bracket 51 fixed to the guide cell 2, and a tip portion of the pivot arm. Half bushings 54, 54 for rotatably fittingly holding the punched rod are attached to the shaft. Reference numeral 55 is an openable and closable lock fitting for fixing both the half bushings in a closed state.

An operation panel 60 is attached to the back side of the guide cell 2. The operation panel 60 is for operating the feed device 5 and the rock drill, and is provided with a plurality of operation levers 61, ... And valves 62 ,. The amount of blow air in the drilling hole can also be adjusted with this operation panel. The above-mentioned plurality of operation levers are hits of a rock drill,
It is for switching air for rotation, for switching air for feed motor, and for switching air for blower.In addition to these,
Line oiler-6 for mixing lubricating oil into air
5 and its valve are provided. An air hose from an external compressor is connected to the operation panel 60, and is also connected to the feeding device 5 and the rock drill 30 by an air hose.

A suspending fixture 70 is fixed to the upper end of the feeding device 5. The fixture 70 is bent in a hook shape and extends to the back side, and a plurality of locking holes 7 are provided in this portion.
1, ... Are provided in rows.

When the downward punching device 1 is used, the hook 81 of the automobile crane 80 is hooked in the locking hole 71 of the fixture 70 at the upper end to hang the hook 81 so as to stand up. By selecting the locking hole 71 on which the hook 81 is hooked, the guide cell 2 can be held in a vertical state or tilted at an arbitrary angle θ and held. In any state, the foot pad 37 at the lower end is brought into contact with the floor surface.

In this state, the rock drill 30 is positioned at the uppermost position of its moving stroke, and the drilling rod 84 is attached, and the lock bit 85 is attached to the tip of the rod. The outer peripheral portion of the punched rod 84 is held in parallel with the guide cell by the centrizer-50. When the rock drill 30 is operated in this state and the feed device 5 is driven to apply thrust, the rock bit pierces the floor surface. During perforation, blow air (air and water in some cases) is ejected from the ejection port of the lock bit. During this time, the worker stands on the side of the guide cell 2 and operates the operation lever of the operation panel.

When the drilling of a predetermined depth is completed, the drilling device 1
Is slightly lifted, moved to the next punching position, and set. This movement can be easily performed by an operator manually pushing and pulling the guide cell. FIG. 5 is an explanatory view when drilling a vertical shaft H for a pier, and FIG. 6 is a plan view of the vertical shaft H, in which prepared holes h, ... Are successively drilled at appropriate intervals.
When a predetermined number of holes have been drilled, the prepared hole is used for blasting to dig a vertical shaft. Depending on the case, it is also possible to employ a destruction method using an expanding agent or a breaker instead of blasting.

7 and 8 are explanatory views of the pier reinforcement work.
In this case, as shown in FIG. 7, the four metal fittings 10, 10, 42, 42 provided on the upper, lower, left and right sides are attached to the pier F.
By pressing against the pier and performing the work, a plurality of holes can be efficiently drilled at a constant distance from the pier. The distance from the pier to the drilling position can be appropriately adjusted by adjusting the amount of protrusion of the metal fitting.

Since this downward drilling device can be hung by using a general-purpose automobile crane or the like, it can be easily transported, stored and installed, and can be quickly carried in and installed at a desired construction site. can do. It can be easily attached to and detached from the car crane. Further, since the main body is suspended and held by the crane to perform the punching work, the work is easy and easy. In the above description, an example in which the vehicle is suspended by the crane is explained, but it goes without saying that the work can be performed by using another crane device. Further, in the above embodiment, the rock drill and the feeding device are driven by air, but they may be driven by hydraulic pressure.

[0024]

As is apparent from the above description, the downward punching device according to the present invention is structurally compact,
It is easy to handle. For this reason, it became suitable for drilling small vertical shafts. It goes without saying that this device can be used for vertical drilling other than the vertical shaft for piers.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a side view thereof.

FIG. 3 is a bottom view of a centrizer.

FIG. 4 is a plan view of a carriage.

FIG. 5 is an explanatory diagram of a vertical shaft drilling method.

FIG. 6 is a plan view of a vertical shaft.

FIG. 7 is an explanatory diagram when it is used for pier reinforcement work.

FIG. 8 is an explanatory diagram when it is used for pier reinforcement work.

[Explanation of symbols]

1 Downward drilling device 2 Guide cell 5 feeder 10 metal fittings 25 carriage 30 drilling machine 35 Balance Weight 37 foot pad 60 control panel 70 Fixture 80 car crane

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Mohri 4F, Yamago Building 1-14-28 Minamihorie, Nishi-ku, Osaka City Yamamoto Iron Works Co., Ltd. Osaka Sales Office (56) Reference JP-A-3-172494 ( JP, A) Actual Kaihei 3-2092 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21B 3/00

Claims (2)

(57) [Claims] 1. A rock drill is vertically movably mounted on the surface side of a guide cell having an attachment tool that can be suspended from an automobile crane at its upper end, and the rock drill is moved vertically. Provided with a feeding device, the lower end portion of the guide cell is provided with a footpad for fixing the guide cell by pressing it against the floor surface, and the back portion of the guide cell has a guide cell of the weight of the rock drilling machine. A downward drilling device, which is equipped with a balance weight for preventing tilting. 2. The downward punching device according to claim 1, further comprising a metal fitting on the front surface side of the guide cell, the metal fitting being in contact with the wall surface to keep the distance from the wall surface constant.