JPH0635791B2 - Internal expansion hole drilling equipment for civil engineering - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an internal expansion hole excavating device for civil engineering, which is mainly used for excavating a ground below a paving slab to be wider than an entrance side. .

(Prior Art) In general, a concrete pavement plate is partially submerged on the pavement surface due to topographical conditions at the time of construction and operational conditions such as a high load being applied locally.

As a method of repairing such partial subsidence,
A method of lifting the subsided part and filling the backing material under it is considered.As a lifting method, a reaction force that makes a working hole on the front and back of the pavement plate and has a reaction force for lifting underneath A method has been developed in which a board is created, a metal fitting for lifting is inserted under the pavement plate from a work hole, and the pavement plate is lifted with a jack. In order to carry out such a method, it is necessary to form a work space wider than this under the work holes of the pavement plate, and moreover, in order to shorten the operation stop time on the pavement plate during the lifting work, many work spaces must be formed. It is necessary to complete the excavation molding of the work space in a short time.

On the other hand, as an apparatus for excavating and forming an expansion hole having an inner diameter enlarged in the ground, conventionally, there is a drilling apparatus mainly used when constructing an underground anchor. Examples of conventional devices of this type include, for example, Japanese Utility Model Laid-Open No. 52-28629 and 57-57.
There is a device disclosed in Japanese Patent No. 56881. As shown in FIG. 7, these devices have a moving cylinder 51 on the outer periphery of the main shaft 50.
Is slidably supported only in the axial direction, and both ends of an excavating blade composed of upper and lower links 53 and 54 whose tips are pivotally attached to a bracket 52 fixed to a main shaft 50 and a movable tube 51 are pivotally attached to each other. In addition, the pivotal attachment portions 55 of the two links 53 and 54 are projected in the radial direction by moving to the bracket 52 side, whereby the expansion hole is formed.

(Problems to be Solved by the Invention) In the conventional excavation device as described above, since the upper and lower links that protrude in the radial direction and form the expansion hole have substantially the same length,
Even if it is projected to the maximum extent, the upper and lower surfaces of the expanded hole to be excavated must be conical, and as described above, when forming a work space for raising the pavement plate. If you use it, earth and sand will remain between the bottom surface of the pavement and the expanded hole,
There is a problem in that the removal work is required, and the bottom surface of the hole needs to be flattened again, which requires many man-hours and requires manual work, which is inefficient.

In view of such a conventional problem, the present invention is such that the upper and lower surfaces of the expansion hole are both excavated flat, and when forming a working space under the pavement plate, a clean hole is efficiently formed without requiring manual finishing. The purpose of the invention is not to provide an internal expansion hole drilling device for civil engineering.

(Means for Achieving the Object) A feature of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose is to provide a movable base that is reciprocally supported along a support guide, A main shaft rotatably supported by the movable table and rotated by the drive of a motor; an excavating blade supporting movable cylinder fitted slidably only in the axial direction on the outer periphery of the tip end of the main shaft; One end of each of the movable cylinder and the lower end of the main shaft is pivotally attached, and the other end is pivotally attached to each other. Civil engineering comprising moving cylinder driving means for forcibly moving in the axial direction, moving table driving means for forcibly reciprocating the moving table, and excavated earth and sand discharging means for taking out excavated earth and sand excavated by the excavating blade. In the internal expansion hole drilling device for Of the two links that make up the cutting blade, the bottom side excavating blade has a link on the moving cylinder side that is longer than the link on the lower end of the spindle, and the top side excavating blade has a link on the lower end of the spindle that is longer than the link on the moving cylinder side. There is a kind.

The excavated soil discharging means can be finished more efficiently by using a vacuum.

(Operation) In this device, the main shaft is moved in the axial direction by moving the moving table by the moving table driving means, and the moving cylinder is retracted (moved to the side where the main shaft tip is away) by the moving cylinder driving means. The angle of the pair of links forming the excavating blade changes in the direction along the main axis. Conversely, by moving the movable cylinder forward, the pivotal positions of both tips of both links come closer, the angle changes in the direction in which both links bend, and the pivotally attached end between both links protrudes in the radial direction of the main shaft. . By performing this operation in the equal-diameter hole previously formed in the ground, a hole expanded by the protrusion of the excavating blade is formed, and when the excavated earth and sand cannot drop by gravity, the air flow or liquid flow Be carried out by. Further, by moving the main shaft in the axial direction with the digging blade protruding, a hole having an enlarged diameter is formed by the moving length.

Also, the bottom side digging blade has a longer upper side in the upper and lower links, while the upper side digging blade has a longer inner and lower side in the upper and lower links. By this, it becomes possible for each short side link to project at right angles to the main axis, and the top and bottom surfaces of the expansion hole are finished to be flat surfaces.

(Example) Next, an example in which the present invention is carried out for excavation under a paving slab will be described with reference to the drawings.

In the figure, 1 is a pedestal that supports the entire apparatus,
Wheels 2 for movement and support legs 3 that can freely move in and out are provided on the bottom surface.

A stanchion 4 is erected on the gantry 1, and a movable table 5 is supported on the stanchion 4 so as to reciprocate along the stanchion. That is, the movable base 5 includes a sliding cylinder portion 6 surrounding the support column 4.
The support column 4 is penetrated into the sliding cylinder portion 6.
The movable table 5 and the support column 4 are provided with a movable table driving means 7 for forcibly reciprocating the movable table 5. The moving table driving means 7 is engaged with a rack gear 8 fixed to the column 4 in the longitudinal direction thereof, a pinion gear 9 meshing with the rack gear 8 and pivotally supported by the moving table 5, and a reduction gear 10 for rotating the pinion gear 9, 11, a worm wheel 13 fixed to the shaft 12 of the reduction gear 11, a worm 14 meshed with the worm wheel 13, and a handle 16 provided on the worm shaft 15, and by rotating the handle 16. The pinion gear 9 meshing with the rack gear 8 is rotated, and the movable table 5 is moved up and down. In the figure, 17 is a sliding shoe, and 18 is a push pinion gear. A hollow cylindrical main shaft 19 is rotatably supported on the movable table 5 in parallel with the support column 4 via a pair of bearings 20, 20.
The main shaft 19 is a hydraulic motor 21 fixed on the moving table 5.
Is transmitted via gears 22a and 22b.

Brackets 23a, 23b for attaching the excavating blade are provided at 90 ° intervals in the radial direction at the lower end of the main shaft 19. On the other hand, on the outer circumference of the upper end of the lower end of the main shaft 19, the main shaft 19
A movable cylinder 24 that is movable only in the axial direction is fitted to the outer peripheral surface of the movable cylinder 24. The brackets 25a and 25b are provided on the outer circumference of the movable cylinder 24 in the same direction as the brackets 23a and 23b. ing. Then, the brackets 23a, 23b, 25a, 25 arranged vertically
The bottom surface side digging blade 26a and the top surface side digging blade 26b are alternately supported in the circumferential direction between b. Drilling blades 26a, 26
b is composed of a pair of links 27 and 28 having different lengths, and the bottom side digging blade 26a has a shorter link 27.
One end of the link is pivotally supported by the bracket 23a on the lower end side of the main shaft, and one end of the longer link 28 is pivotally supported by the bracket 28a on the movable cylinder side, and the ends of the links 27, 28 are pivotally connected to each other. In addition, the upper side digging blade 26b has a shorter link 2
One end of 7 is pivotally supported by the bracket 25b on the moving cylinder side, and one end of the longer link 28 is pivotally supported by the bracket 23b on the lower end side of the main shaft, so that the tips of both links 27, 28 are pivotally connected to each other.

The difference between the lengths of the two links 27, 28 is that the shorter link 27 is oriented substantially at right angles to the main shaft 19 when the moving barrel 24 is at the lower moving end as shown in FIG. The length is Further, the excavating blades 26a and 26b are separated from each other by 9
They are arranged alternately by shifting by 0 °.

The excavating blades 26a, 26b are provided with excavating claws 29, 29 ...

The moving barrel 24 is forcibly reciprocated by the moving barrel driving means 30. This moving cylinder drive means 30
Is a vertical moving cylinder 32 having a lower end rotatably engaged with an annular groove 31 on the outer periphery of the upper end of the moving cylinder 24, a screw cylinder 33 screwed inside the vertical moving cylinder 32, and this screw cylinder is decelerated. It is composed of a worm wheel 34 and a worm 35 that rotate, and a handle 36 that rotates the worm 35. The vertical moving cylinder 32 is fitted in a guide cylinder 38 fixed to a casing 37 provided on the moving table 5, It can be moved only up and down by the key and the key groove that are directed toward the center.

Both ends of the main shaft 19 are open for communication, a lower end opening is a suction port 39, and an upper end is a hose joint 4.
A hose 41 connected to a vacuum (vacuum suction device) is connected to the hose joint 40.

Next, the excavation work under the paving slab by the apparatus of this embodiment will be described.

Prior to excavation by this device, an excavator such as a core cutter is used to form a working hole B having a predetermined depth in the pavement plate A and the ground therebelow. Move the gantry 1 onto this hole B to move the spindle 1
The support leg 3 is extended at a position where the center of the work hole 9 and the center of the work hole B are aligned, and the pedestal 1 is set immovable. At this time, the movable table 5 is in a raised state, and the movable barrel 24 is raised so that the respective excavating blades 26a and 26b are retracted along the main shaft 19.

Next, while rotating the main shaft 19 by the hydraulic motor 21, the handle 16 is operated to lower the movable table 5, and the bottom surface side excavating blade 26a and the top surface side excavating blade 26b are inserted below the paving plate A. After that, when the handle 36 is operated to rotate the screw cylinder 33, and thereby the moving cylinder 24 is lowered together with the vertical moving cylinder 32, the excavating blades 26a and 26b are bent between the links 27 and 28 in the radial direction. Be projected. As a result, as shown in FIG. 6 (a), excavation of the inner surface of the working hole B under the pavement A is started, and the excavated earth and sand is sucked out by the vacuum from the suction port 39 at the lower end of the main shaft. In this way, when the moving cylinder 24 is gradually lowered to the lowermost position, the shorter link 27 of each of the excavating blades 26a and 26b.
Is orthogonal to the main shaft 19, and the inner diameter of the expanded excavation hole C at this time is maximum. Then, as shown in FIG.
The a and 26b are moved up and down with the projecting state, and the expanded excavation hole C having a necessary depth range is excavated.

In addition, in this embodiment, the device is for performing the expansion hole excavation under the paving slab, but in addition to this, the pillar can be adjusted in various directions, and the back side of the hole with respect to the wall surface or the ceiling surface can be adjusted. It may be possible to extend the excavation.

(Effect of the Invention) As described above, in the civil engineering internal expansion hole excavating device of the present invention, the excavating blade is configured with a pair of links, and the pivoting devices of both links are bent to project in the radial direction. , Of the upper and lower links, the upper and lower surfaces of the expansion hole to be excavated and formed are flat by providing an upper surface side cutting blade with a shortened upper side and a bottom surface side cutting blade with a shortened lower side,
In particular, when forming a work space for raising a pavement plate, there is no uncut portion on the bottom surface of the pavement plate, and finishing by manual work is not required, which makes it possible to work economically and efficiently.

Also, by using a vacuum for excavating sediment,
Clean and efficient soil discharge.

[Brief description of drawings]

The drawings show an example of the embodiment of the present invention. FIG. 1 is a vertical sectional view of the whole, FIG. 2 is a plan view in which a frame is omitted, and FIG.
The figure is a cross-sectional view taken along the line AA in FIG. 1, FIG. 4 is an enlarged front view of the excavating blade portion, FIG. 5 is a plan view of the excavating blade in a protruding state, and FIGS. 6 (a) and 6 (b) are , Partial sectional view showing the excavated state, No. 7
The figure is a side view of a conventional example. DESCRIPTION OF SYMBOLS 1 ... Stand, 4 ... Support, 5 ... Moving stand, 7 ... Moving stand driving means, 19 ... Main shaft, 21 ... Hydraulic motor, 24 ... Moving cylinder, 26a ... Bottom side excavating blade, 26b ...... Upper surface side digging blade, 27, 28 ...... link, 29 …… Drilling claw, 30 …… Movable cylinder drive means, 39 …… Suction port, 40 …… Hose joint, 41 …… Hose, A …… Pavement plate , B ... work hole, C ... extended drilling hole.

Claims (2)

[Claims] 1. A movable table supported so as to be reciprocally movable along a support guide, a main shaft rotatably supported by the movable table and rotated by driving a motor, and an outer periphery of a tip end portion of the main shaft. A movable cylinder for supporting an excavating blade that is slidably fitted only in the axial direction, one end of each of the movable cylinder and the lower end of the main shaft is pivotally attached, and the other end side is mutually pivoted. An excavating blade constituted by a pair of attached two links, a moving cylinder driving means for forcibly moving the moving cylinder in the axial direction, a moving base driving means for forcibly moving the moving base back and forth, In an internal expansion hole excavating device for civil engineering, comprising an excavated earth and sand discharging means for taking out excavated earth and sand excavated by an excavating blade, wherein the excavating blade is a link on a moving cylinder side of both links constituting the excavating blade. Bottom side drilling blade with a longer length than the link at the lower end of the spindle An internal expansion hole excavating device for civil engineering, characterized by comprising two types of an upper surface excavating blade in which a link on the lower end side of the main shaft is longer than a link on the moving cylinder side. 2. The internal expansion hole excavating device for civil engineering according to claim 1, wherein a vacuum is used as the excavated sediment discharging means.