JP2002030658A - Support for hammer drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably support a hammer drill. SOLUTION: An earth-discharging cylindrical case 20 secured to the lower surface of a rotating motor has ribs 21 provided on its peripheral surface along its longitudinal direction. Plural pairs of regulation members 1 and 1 each formed of H-steel are secured to the upper surface of a base frame 11 assembled longitudinally into a rectangular shape, with the pairs intersecting the longitudinal direction of the base frame. A pair of guide rollers 3 rotating about a horizontal axis 3a are provided on the opposite surfaces of the vertical portions 1b of the regulation members 1 of each pair, with the distance between the closest positions of these opposite peripheral surfaces being slightly greater than the width of the rib 21. Such a pair of regulation members 1 mounted in predetermined positions on the upper surface of the base frame 11 are set in place by placing a frame in the placement point of a support pile. Boring is carried out by inserting the cylindrical case 20 into a frame body 10 formed by the base frame 11 and the pair of regulation members 1, with the ribs 21 brought into engagement with the guide rollers 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supporting a hammer drill for excavation used when performing civil engineering work in a place where large heavy equipment is difficult to carry in, such as a mountainous region.

[0002]

2. Description of the Related Art When performing large-scale civil engineering work such as erection of roads and bridges in mountainous areas, heavy construction heavy equipment such as the case of work performed on level ground is required at the site due to topographical conditions. Cannot be brought in.

[0003] Also, since many trees must be cut down at such a construction site, while the merits and demerits of the destruction of the natural environment are strongly pointed out, even if the construction project has a strong public nature, the destruction of the nature is minimized. It is strongly demanded that such heavy machinery cannot be carried in.

For example, a large number of support piles are cast at construction and civil engineering sites.
4 cannot be carried in. As shown in FIG. 5, a hammer drill 30 is hung by a small crane 50 and excavated by the hammer drill 30 as shown in FIG. In the figure, what is indicated by reference numeral 51 is a wire for connecting the crane main body 50 and the hammer drill 30, which will be described later.

In this hammer drill 30, as shown in FIG. 6, a motor 32 for rotating an air hammer is fixed to an upper bracket 31, and a screw rod 34 is attached to a main shaft of a speed reducer 33 projecting from the lower surface of the bracket 31. At the lower end of the screw rod 34, an air hammer 35 which moves up and down by air drive is provided. Air for driving the air hammer 35 reaches the air hammer 35 from a pipe 36 provided on the motor bracket 31 through a passage 34b in the screw rod.

In the hammer drill 30, the cylindrical case 20 is suspended from the lower surface of the bracket 31 of the motor 32 to a position slightly above the upper end of the air hammer 35 so as to surround the screw rod 34. The cylindrical case 20 is provided with the screw 34a in the case 20 in order to prevent crushed soil of the rock crushed by the bit 35a at the lower end of the hammer 35 from accumulating on the edge of the bit 35a.
The crushed soil serves as a passage for transporting the crushed soil upward, and the crushed soil is provided at a discharge port 20 provided at an upper portion of the case 20.
a to be discharged out of the case 20.
It also serves as a discharge passage for air sent to and operated by the air hammer 35.

[0007]

The hammer drill 30 described above has a large crane 40 shown in FIG. 4 when the construction / civil engineering site is flat and a large heavy machine can be carried in. In this case, the support of the hammer drill 30 (removal of the rotating motor) is performed by attaching the bracket 31 to the reader 41 of the crane 40.

On the other hand, in a mountainous area into which a large heavy machine cannot be carried, as shown in FIG.
In this case, the hammer drill 30 is suspended by excavation. In this case, the hammer drill 30 is supported by connecting one end of a wire 51 to the bracket 31 and the other end of the crane body 50 as shown in the figure. And the surrounding trees or piles driven into the ground.
It is supported by a tension of 1. Adjustment of the length (adjustment of tension) of the wire 51 is performed manually.

However, in such a primitive method, the support is unstable, the rotation axis of the hammer drill 30 does not become vertical, and the rotation axis itself rotates around a vertical line. It takes a lot of time and effort to reach the excavation operation in the posture, and the posture is unstable during the excavation. Therefore, the verticality of the hammer 35 is poor, and a hole of an extra size is excavated. Excavation efficiency is very poor.

Accordingly, an object of the present invention is to provide a method for excavating a hole in a support pile by hanging a hammer drill with a (small) crane in a site where it is difficult to carry heavy equipment such as a civil engineering site in a mountainous region. The object is to make the hammer drill stably supported.

[0011]

In order to solve the above-mentioned problems, the present invention provides a hammer drill having a projecting ridge formed along the longitudinal direction on a peripheral surface of a cylindrical case for discharging the earth. The rotation reaction force of the motor is received by the restricting means having an engaging shape for engagement.

[0012] By doing so, unlike the conventional support by wire tension, the regulation effect is remarkably large, so that the hammer drill is securely supported, easily heads to the center of the excavation, and the hammer drill is supported even during the excavation. Verticality is increased, and excavation efficiency is improved.

As the restricting means, the engaging shape is provided in a frame of a frame surrounding the outer shape of the case, and the frame is fixed horizontally at a predetermined height from the ground. The hammer drill can be inserted and used so that the ridge of the case engages with the engaging shape. Then, after excavation, the support pile is driven. When performing the centering, the frame can be used and the reference point can be determined to perform the centering, so that the work efficiency and accuracy are improved.

At this time, the engaging portion of the ridge is constituted by a pair of rollers whose rotating shafts are oriented in a horizontal direction, and the ridge is gently held between the pair of rollers. In this case, the sliding form between the ridge and the roller is in rolling contact, so that the excavating operation of the hammer body, that is, the vertical movement, is smooth.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the accompanying drawings. As described above, in the present invention, in order to support the hammer drill 30 shown in FIG. 6 shown in the conventional example, the hammer drill 30 is engaged with the ridge provided on the peripheral surface of the cylindrical case 20 for discharging earth along the longitudinal direction thereof. The rotation reaction force of the motor 31 is received by a restriction means having an engaging shape that engages with the motor 31. FIG. 1 shows the restriction means of this embodiment.

This is, as shown in FIG.
A pair of regulating members 1, 1 (hereinafter referred to collectively as a pair) are formed on an upper surface of a base frame 11 formed into a long rectangular shape with a mold steel and formed of an H-shaped steel having substantially the same length as the rectangular short piece. In this case, four members are fixed). Each of the four rectangular frames 10 formed by the four sets of restricting members 1 and the base frame 11 corresponds to a “frame body” of the present invention, and each of the restricting members 1 is provided on the hammer drill 30 by the above-described discharging method. The rotation of the cylindrical case 20 is directly restricted. FIG. 1B shows one of the frame 10 and the cylindrical case 2.
FIG. 2 is an enlarged plan view showing an engagement mode with the zero.
Only the outer shape of the cylindrical case 20 is shown to avoid complication of the drawing. In the figure, reference numeral 21 indicates a case 20.
Are provided on both ends of one diameter of the cylindrical case 20 in a rectangular cross section along the length direction of the cylinder.

FIG. 2A is a perspective view showing only one of the pair of regulating members 1 taken out, and FIG. 2B is a plan view and FIG. 2C is a front view. .
The other regulating member 1 has a symmetrical shape as shown in FIG.

As shown in FIGS. 2 (a) and 2 (b), each of the pair of regulating members 1 penetrates the upper and lower flange portions 1a, 1a at positions opposed to each other in the middle in the longitudinal direction. A trapezoidal cutout 2 is provided. The notch 2 is a relief for inserting the protrusion 21 of the case 20 into this portion. A pair of guide rollers 3 is provided on the side of the vertical portion 1b where the notch 2 is located, opposite to the paired one.
Is provided. Each guide roller 3 has its rotating shaft 3a vertically supported on the surface of the vertical portion 1b. As will be described later, the base frame 11 is installed horizontally in a space, and is fixed to its upper surface. The rotation shaft 3a of the regulating member 1
Is a horizontal rotating shaft, and the guide roller 3 is a horizontal shaft 3a.
Rotate around. The distance of the closest position between the opposing peripheral surfaces of each pair of guide rollers 3 is slightly larger than the width of the ridge 21.

At both ends of the restricting member 1, a suspending portion 4 having a hook hole 4a for hanging a hook by a crane 50 when moving the restricting member 1 projects.

The pair of regulating members 1 as described above are mounted at predetermined positions on the upper surface of the base frame 11, as shown in FIG. Attachment is performed by screwing (not shown), and the longitudinal direction of the regulating member is perpendicular to the longitudinal direction of the base frame 11.

When fixed at the predetermined fixed position, FIG.
As shown in FIG. 1B, the distance d between the opposing edges of each pair of regulating members 1 is slightly larger than the outer diameter D of the cylindrical case 20, and as shown in FIG. The center O of each of the four sets of regulating members 1, that is, the arrangement interval P between the midpoints O of the pair of regulating members 1 in the facing direction is equal to the pitch of the driving positions of the support piles. That is, the “frame body 1” formed by each pair of the regulating member 1 and the base frame 11.
"0" supports the hammer drill 30, and when the hammer drill 30 is fixed to the setting area of the support pile, its center O indicates the excavation position. Further, as described later, the support pile is driven into the drilled hole. It is also a standard for centering support piles when installing,
In other words, it plays the role of a ruler. Hereinafter, the base frame 11 having the above-mentioned “frame body 10” is referred to as “centering ruler 11 for hammer drill”, or simply “ruler 11” for the purpose of clearly indicating the role. Next, a method of using the ruler 11 will be described.

First, the ruler 11 is carried into a setting area of the support pile, and is set at a setting point of the support pile determined in advance by surveying. As shown in FIG. 3, the set of the ruler 11 is provided with a gantry 12 for fixing the ruler 11 in its area, and fixed to the upper surface thereof with a screw (not shown). The ruler 11 is fixed so that the constituent surface of the frame is horizontal. In the figure, reference numeral 1
The member indicated by 3 is a reaction force pile of the gantry 12.

Here, as described above, the arrangement pitch P of the center O of each set of the regulating members 1 of the ruler 11 is determined in advance by the setting position of the adjacent support piles at the setting point. Since the distance is equal to the pitch (pitch), four restriction members 1
When two sets are selected from among the above, and the ruler 11 is arranged so that the respective midpoints and the corresponding driving positions are matched,
The midpoints of the remaining two sets of regulating members 1 also coincide with the driving positions.

When the preparation for excavation is completed, the hammer drill 30 is suspended by the crane 50 and first inserted between the set of regulating members 1 of the ruler 11. At this time, the protrusion 21 of the cylindrical case 20 for discharging the earth is fitted between the pair of guide rollers 3 of the engagement portion of the regulating member 1.

Then, since the axis of the hammer drill 30 necessarily coincides with the center of the excavation, the excavation is performed as it is.
During excavation, as shown in FIG.
The pair of guide rollers 3 gently engaged with the ridges 21 receive a rotational reaction force of the motor 32. At that time, since the guide roller 3 and the ridge 21 come into rolling contact with each other, the digging operation of the main body of the hammer drill 30, that is, the vertical movement, becomes smooth, and the digging efficiency is improved. Excavation excavates rock for more than 3 meters.

The above operation is performed in each of the four sets of regulating members 1, and excavation at four excavation positions defined by the four sets of regulating members 1 is completed. After excavation, a support pile (H-shaped steel) is erected in the hole, and mortar is cast and fixed. As described above, in this embodiment, as a reference for centering the support pile, A reference point can be set on the ruler 11 and can be used.
Can be performed with high accuracy.

Moreover, at this time, in this embodiment, the excavation has been performed in such a manner that the ridge 21 of the case 20 is gently held between the guide rollers 3, so that the excavation hole originally has a high verticality, and extra rock Since no excavation has been made, it is easy to set up support piles, and there is no waste in the mortar to be cast.

When the excavation based on one ruler 11 and the installation of the support pile in the excavation hole are completed, the ruler 11 is moved to the next support pile driving area, and the same rule is applied thereto. , And excavation of four new points in that area is repeated.

[0029]

As described above, according to the present invention, a ridge is provided along the longitudinal direction on the peripheral surface of a cylindrical case for discharging earth attached to a bracket of a rotary motor of a hammer drill. Since the rotation reaction force of the motor is received by the regulating means having an engagement shape to engage with the strip, unlike the conventional support by the tension of the wire,
Since the regulation effect is remarkably large, the hammer drill is securely supported, and even during the excavation, the verticality thereof is increased, and the excavation efficiency is improved.

As a restricting means, a frame surrounding the outer shape of the case is prepared, and the engaging shape is provided in the frame.
The frame is fixed at a position where a desired excavation center is included in the frame, and when the case of the hammer drill is inserted into the frame, the ridge of the case engages with the engagement shape. In addition, if the axis of the hammer drill is coincident with the center of the excavation, the excavation is performed, and the centering of the support pile is performed using the frame body. Since the operation can be performed with the points determined, the work efficiency and centering accuracy are improved.

At this time, if the engaging portion of the ridge is constituted by a pair of rollers whose rotation axis is oriented in the horizontal direction, and the pair of rollers gently clamps the ridge, the ridge and the ridge can be formed. Since the sliding form between the rollers is a rolling contact, the excavating operation of the hammer body, that is, the vertical movement is smooth, and the excavating efficiency is improved.

[Brief description of the drawings]

FIG. 1A is a plan view showing an embodiment of a regulating means of the present invention, and FIG. 1B is an enlarged view of a main part thereof.

2A is a perspective view of a regulating member, FIG. 2B is a plan view thereof, and FIG. 2C is a front view thereof.

FIG. 3 is a diagram showing a method of using the regulating means of the embodiment.

FIG. 4 is a diagram showing an example of a large crane having a hammer drill.

FIG. 5 is a schematic diagram showing a state in which a hammer drill is hung by a small crane for excavation.

FIG. 6 is a view showing a structure of a hammer drill.

[Explanation of symbols]

 Reference Signs List 1 regulating member 1a flange portion 1b vertical portion 2 notch 3 guide roller 3a rotating shaft (horizontal axis) 10 frame 11 ruler, base frame 20 cylindrical case 21 ridge 30 hammer drill 31 bracket 32 motor 34 screw rod 35 air hammer 40 large crane 50 crane

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yasuhiko Nasugawa 3-10-3 Higashi Mikuni, Yodogawa-ku, Osaka Prime Heights Shin-Osaka 920 F-term (Reference) 2D029 BA02 2D050 CB03 CB16 EE10 EE14 EE19

Claims (3)

[Claims] 1. A motor for rotation and a hammer connected concentrically to a main shaft thereof and adapted to move up and down by air drive, wherein a cylindrical case for discharging the earth is mounted on a bracket to which the motor is fixed. A method of supporting the hammer drill when drilling by hanging a hammer drill fixed to the main shaft and concentric with a crane, providing a ridge along a longitudinal direction on a peripheral surface of the case,
A method for supporting a hammer drill, wherein a rotation reaction force of the motor is received by regulating means having an engagement shape to engage with the ridge. 2. As the restricting means, the engaging shape is provided in a frame of a frame surrounding the outer shape of the case, and the frame is horizontally fixed at a predetermined height from the ground. The hammer drill supporting method according to claim 1, wherein the hammer drill is inserted and used so that the protrusion of the case is engaged with the engagement shape in the frame. 3. The engaging shape with which the ridge engages is constituted by a pair of rollers whose rotating shafts are oriented in the horizontal direction, and the pair of rollers gently grips the ridge in the horizontal direction. The said frame body of the hammer drill support method of Claim 1 or 2 characterized by the above-mentioned.