JP2010281121A - Drilling hammer device and rotary drilling device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drilling hammer device, controlling the magnitude of generated noise and vibration by controlling the flow rate of a supplied working fluid for the drive depending on a difference in environment of a construction plate such as an urban district, the suburbs or woods, or according to the time zone for working. <P>SOLUTION: This drilling hammer device (H1) includes: a hammer device body (1); and an air tank (2) provided on the hammer device body (1), to which an extended body (8) is connected. The hammer device body (1) includes: a hammer bit (4, 40, 41); a hammering device (5) for hammering the hammer bit (4, 40, 41); a working fluid passage in which a working fluid supplied from the air tank (2) to the hammering device (5) is circulated; and a bore diameter control means provided in the working fluid passage, having a pair of contact surfaces (120, 130), and adapted to control the size of an effective bore of each working fluid passage by shifting the mutual positions of the contact surfaces (120, 130) and fixing the same in predetermined positions. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drilling hammer device and a rotary drilling device using the same. More specifically, for example, in a drilling hammer device that excavates a vertical hole in the ground by using it in combination with a rotary table, the amount of generated noise or vibration is adjusted by adjusting the flow rate of the driving working fluid to be supplied. It relates to the thing which can adjust the thickness.

In the field of civil engineering and construction, a drilling hammer device called a down-the-hole hammer is used in drilling work for excavating a vertical hole in a hard ground mainly including rock, rocks, and concrete.
As an example of such a drilling hammer device, there is one described in Patent Document 1 proposed by the present inventor. This drilling hammer device has a structure in which a working fluid such as compressed air is supplied to drive an internal piston to hit a hammer bit at the tip. The drilling hammer device is used in combination with, for example, a rotary table, held in a standing state by a rotary table, and given a rotational force in the axial circumferential direction while hitting the ground with a hammer bit to be hit, Drilling holes.

JP 2008-138474 A

  The drilling hammer device described in Patent Document 1 uses a plurality of hammer bits, and each hammer bit shifts the timing of striking the ground at the bottom of the hole. This makes it possible to drill holes with low noise and vibration, and is extremely useful in this respect. However, it has also been found that there is room for improvement in the following points.

  In other words, if the flow rate of the working fluid that activates the hammer bit can be adjusted with the same drilling hammer device, for example, the magnitude of noise and vibration will be adjusted to a size that takes into consideration the surrounding area in accordance with the working time zone. However, it is possible to make finer adjustments to maximize work efficiency.

  However, in the conventional drilling hammer device, since the flow rate of the supplied working fluid is constant, the magnitude of noise and vibration generated during work is almost uniform, for example, in urban areas, suburbs, forest areas, etc. The magnitude of the generated noise and vibration could not be adjusted according to the difference in the environment of the construction site or according to the time of the work.

(Object of the present invention)
The present invention relates to a drilling hammer device capable of adjusting the magnitude of noise and vibration generated by adjusting or controlling the flow rate of a driving working fluid to be supplied, and a rotary drilling device using the same. And an excavation method.

  Means taken by the present invention to solve the above problems are as follows.

The present invention
A drilling hammer device for excavating the ground by transmitting a striking action of a piston operated by a working fluid to a bit,
A hammer device body comprising the piston;
An air tank for sending the working fluid to the hammer device body;
Including
Between the air tank and the hammer device main body, there is a valve element for adjusting the flow rate of the working fluid sent from the air tank to the hammer device main body.
This is a drilling hammer device.

The present invention
The valve element is
An air tank-side air flow adjusting plate provided on the side of the air tank connected to the hammer device body, and having a vent;
It is provided on the side of the hammer device main body that is joined to the air tank, and has a hammer device main body side air conditioning plate having a vent,
The air tank side air flow adjusting plate and the hammer device main body side air flow adjusting plate rotate relative to each other around the center to adjust the flow rate of the working fluid to be sent by changing the overlapping degree of the vents.
The drilling hammer device.

The present invention
The degree of overlap of the vents varies depending on the rotation direction of the air tank side air conditioning plate with respect to the hammer device main body side air conditioning plate,
The drilling hammer device.

The present invention
A hammer device body including a piston, and an air tank that sends the working fluid to the hammer device body, using a hammer device for drilling that excavates the ground by transmitting a striking action of the piston operated by the working fluid to the bit;
Between the air tank and the hammer device body has a valve element for adjusting the flow rate of the working fluid sent from the air tank to the hammer device body, the air tank and the hammer device body rotate relatively around the center, The flow rate of the working fluid to be sent changes depending on the rotation direction.
Excavation method.

The present invention
A drilling hammer device that is used in combination with a rotation imparting device and excavates a vertical hole in the ground by rotating in the axial circumferential direction with the rotation imparting device,
A hammer device body,
An air tank that is provided at the base of the hammer device body, has a connecting means for connecting the extension, and sends working fluid to the hammer device body;
With
The main body of the hammer device
A plurality of hammer bits are provided at the tip of the hammer device body, and can move forward and backward in the excavation direction.
A hammering device that is provided inside the excavation hammer device main body corresponding to each hammer bit, and strikes each hammer bit by moving a piston by the supplied working fluid;
A working fluid path provided corresponding to each striking device, through which a working fluid supplied from the air tank to each striking device flows;
The size of the effective mouth of each working fluid path is provided at the start point, end point or midway of the working fluid path, and has at least a pair of contact surfaces, and the respective contact surfaces are displaced from each other and fixed in place. Aperture adjustment means for adjusting the thickness;
With
This is a drilling hammer device.

The present invention
Each contact surface of the caliber adjusting means is structured to be shifted in the axial direction of the hammer device main body, and in each case when the hammer device main body rotates in the forward direction and in the reverse direction, The positional relationship of each contact surface is fixed at a predetermined position by the action of resistance caused by contact with the ground, and the effective mouth size of each working fluid path formed in each case of forward and reverse rotation Is different,
The drilling hammer device.

The present invention
The drilling hammer device;
A rotation imparting device capable of holding the drilling hammer device in an upright state and applying a rotational force in the axial direction to the drilling hammer device;
With
It is a rotary drilling device.

(Function)
The operation of the drilling hammer device and rotary drilling device according to the present invention will be described. Here, the constituent elements used in the description are assigned in correspondence with the reference numerals given to the respective parts in the embodiments described later. These reference numerals are the same as the reference numerals described in the claims of the claims. Similarly, it is only for the purpose of facilitating understanding of the contents, and the meaning of each component is not limited to the above-described parts.

  First, set up the drilling hammer device (H1) at the drilling location and place the drive bush into the air tank (2) on the upper part of the drilling hammer device (H1). Is placed on a temporary scaffold or the like. A necessary number of extension bodies (8) are connected to the upper part of the air tank (2). The extension body (8) is connected to a suspension tool to which a suspension wire is connected, and an air supply pipe is connected to the suspension tool.

  While the drilling hammer device (H1) to which the extension body (8) is connected is suspended by a crane suspension wire, the drive bush is operated to rotate the drilling hammer device (H1) in the axial circumferential direction. The compressed air, which is a working fluid, is supplied to the striking device (5) through the working fluid path (31, 121, 131, 14, 121a, 131a, 135, 134, 14a). In addition, oil mist for lubrication etc. may be mixed in compressed air. As a result, the hammer bit (4, 40, 41) at the lower end of the drilling hammer device (H1) is hit with the piston (51), and the hammer bit (4, 40, 41) hits the ground to excavate the hole. The

  The crushed material and earth and sand generated in the hole by excavation are sent out to the outside of the hole by compressed air sprayed from each striking device (5). Further, as the excavation progresses and the hole becomes deeper, the extension body (8) is successively added, and a hole having a predetermined depth is excavated.

  Further, by adjusting the contact surfaces (120, 130) that are paired with the aperture adjusting means (12, 121, 121a, 13, 131, 131a, a, b, c, d, 122) by shifting their positions relative to each other, the working fluid path is fixed. Adjusting or controlling the flow rate of the compressed air supplied to the striking device (5) by adjusting the effective mouth size and changing the striking force of the piston (51) against the hammer bit (4, 40, 41) Thus, the excavation capability of the drilling hammer device (H1) can be adjusted.

  In addition, each contact surface (120, 130) of the diameter adjusting means is structured to be shifted in the axial circumferential direction of the hammer device body (1), and when the hammer device body (1) is rotated in the forward direction, it is in the opposite direction. In each case when rotating, the positional relationship of each contact surface (120, 130) is fixed at a predetermined position by the action of resistance caused by contact with the ground during rotation, and in each case of forward and reverse rotation The drilling hammer device (H1) having different effective mouth sizes for each working fluid path to be formed has a maximum excavation capability by applying a rotational force to the air tank (2) in the forward rotation direction. Excavation capacity is minimized by applying rotational force in the reverse direction. Since this adjustment is automatically performed only by changing the rotation direction of the drilling hammer device (H1), for example, manual mechanical adjustment is unnecessary, and there is no troublesome adjustment and efficiency is improved.

According to the present invention, a drilling hammer device capable of adjusting the magnitude of noise and vibration generated by adjusting or controlling the flow rate of a driving working fluid to be supplied, and rotary cutting using the same. A hole device and a drilling method can be provided.
Therefore, when drilling a vertical hole in the ground using a drilling hammer device in combination with a rotation imparting device, for example, in urban areas, work is performed with low noise and low vibration so as not to disturb the surrounding area. In the suburbs, forests, etc., work with maximum capacity, focusing on the speed of work, etc. Depending on the environment of the construction site or according to the time of work, work with the most suitable excavation capacity be able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory perspective view showing a first embodiment of a drilling hammer device according to the present invention. FIG. 2 is an enlarged longitudinal sectional view showing the structure of the drilling hammer device of FIG. 1. FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 2, and (a) is an explanatory view showing a state of the aperture adjusting portion when the flow rate of compressed air supplied by rotating the drilling hammer device to the right is maximized; FIG. 4 is an explanatory view showing a state of the aperture adjusting portion when the drilling hammer device is rotated counterclockwise to minimize the flow rate of the compressed air. 3 shows a type in which the rate of decrease in the flow rate of the compressed air supplied is different, and (a) shows the aperture when the drilling hammer device is rotated to the right to maximize the flow rate of the compressed air. Explanatory drawing which shows the state of an adjustment part, (b) is explanatory drawing which shows the state of an aperture adjustment part when rotating the hammer apparatus for hole drills counterclockwise and making the flow volume of compressed air the minimum. BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing which shows embodiment of the rotary drilling apparatus which concerns on this invention. The longitudinal cross-sectional view which shows 2nd Embodiment of the hammer apparatus for drilling which concerns on this invention. BB sectional drawing of FIG. The longitudinal cross-sectional view which shows 3rd Embodiment of the hammer apparatus for hole drilling which concerns on this invention. CC sectional drawing of FIG.

  The present invention will be described in detail based on the embodiments shown in the drawings.

  Please refer to FIG. 1 to FIG.

The hole drilling hammer device H1 is a rotary drilling hole in combination with a rotary table 9 which is a rotation applying device capable of holding the hole drilling hammer device H1 in an upright state and applying a rotational force in the axial circumferential direction. It constitutes the device A and is used for excavating a vertical hole in the ground.
The drilling hammer device H1 is sequentially connected with the kelly rod 8 as an extension as the vertical hole becomes deeper, so that the total length including the kelly rod 8 becomes longer.

  The entire drilling hammer device H1 is formed in a substantially cylindrical shape. The drilling hammer device H1 is provided at a hammer device body 1 having a hammer bit group 4 at a distal end portion (lower end portion in FIG. 2) and a proximal end portion (upper end portion in FIG. 2) of the hammer device body 1. An air tank 2 is provided.

  2, the hammer device main body 1 is connected to the upper base casing 10 and the base casing 10 in FIG. 2, and the lower front casing is rotatable with respect to the base casing 10 in the axial circumferential direction within a required angular range. 11 is provided. The connection structure between the base casing 10 and the front casing 11 will be described later.

  A fixing hole 101 for fixing the air tank 2 is formed on the upper side of the base casing 10. A fixing hole 102 for fixing an air diffusion member 3 to be described later is formed below the fixing hole 101. Further, below the fixing hole 102, the fixing hole 103 for fixing the upper air flow adjusting plate 12 which is slightly larger in diameter than the fixing hole 102 and constitutes the diameter adjusting means together with the lower air flow adjusting plate 13 which will be described later. Is formed.

  The air tank 2 is fitted in the fixing hole 101 and is fixed by a bolt, a nut, or the like (not shown). The air tank 2 includes a cylindrical body 20 having a diameter smaller than that of the front casing 11 and an upper member 21 formed with an air introduction hole 210 penetrating vertically in a central portion thereof. Is introduced from the air introduction hole 210 into the space 22 inside the cylindrical body 20.

  A connecting joint 23 that connects a kelly rod 8 to be described later is fixed to the upper member 21 by bolts (reference numerals omitted). The connection joint 23 has a joint portion 230 having an approximately hexagonal bar shape on the upper side. An air introduction hole 231 that communicates with the air introduction hole 210 is formed in the center of the connection joint 23 so as to penetrate vertically.

  The air diffusing member 3 diffuses compressed air supplied through the connecting joint 23 to equalize the pressure and sends it to the striking device 5. The lower part is fitted in the fixing hole 102 so that it does not come out upward. It is fixed to. The air diffusing member 3 has a so-called shape, and the upper side penetrates the fixing hole 101, and most of the air diffusing member 3 is located in the space 22 inside the cylindrical body 20 of the air tank 2.

  The air diffusing member 3 includes a bowl-shaped receiving part 30 that receives compressed air blown from the air introduction hole 210 of the air tank 2 (a shape obtained by cutting a spherical hollow body in half), and a frustoconical shape that supports the receiving part 30 A hollow support 31 is provided. A required number of air intake holes 32 for taking compressed air into the support 31 are formed in the support 31.

  With such a configuration, the compressed air supplied through the connection joint 23 hits the receiving portion 30 of the air diffusing member 3, then bounces along the concave surface portion of the receiving portion 30, and further returns to the support 31 side. Passing through each air intake hole 32, the support 31 of the air diffusing member 3 which is a working fluid path, the vent 121 of the upper ventilation control plate 12, the vent 131 described later of the lower ventilation control plate 13, the ventilation path 14 and the ventilation. The air passes through the opening 121a, the ventilation hole 131a, the communication groove 135, the ventilation hole 134, and the ventilation path 14a, which will be described later, of the lower ventilation adjustment plate 13, and is sent to each impacting device 5 that will be described later.

  As described above, the hammer device main body 1 includes the base casing 10 and the front casing 11 that is connected to the base casing 10 so as to be rotatable in a predetermined angular range in the axial circumferential direction. On the outer peripheral portion of the base casing 10, large-diameter portions 104 projecting outward at five locations at equal intervals in the axial circumferential direction are provided. Each large diameter portion 104 is formed with a work port 105 provided inwardly from the side surface. A through hole 107 through which the connecting bolt 106 passes is formed through the bottom of each work port 105. Each through hole 107 is an oval hole that is slightly curved in the rotational direction (see FIGS. 3 and 4).

  In the fixing hole 103 of the base casing 10, as described above, the upper air flow adjusting plate 12, which is a disk-shaped air tank side air flow adjusting plate constituting the diameter adjusting means, is fitted and fixed. The upper air flow adjusting plate 12 constitutes a valve element together with a lower air flow adjusting plate 13 described later. In addition, a valve element is not limited to this structure, The thing of well-known various structures is employable.

  The upper air flow adjusting plate 12 has the same thickness as the depth of the fixing hole 103, and the lower surface 120 is a contact surface in contact with the upper surface 130 of the lower air flow adjusting plate 13 described later. As shown in FIG. 3, the upper ventilation control plate 12 has ventilation holes 121, 121a (five ventilation holes 121 and five ventilation holes 121a) penetrating the upper and lower surfaces at six locations near the outer peripheral edge. It is formed on the same circle concentric with the outer periphery of the adjusting plate 12. Each vent 121, 121a is an oval hole whose axial direction is slightly longer than the radial direction.

  Among these, the vent holes 121 provided at five locations at equal intervals in the axial circumferential direction lead to the striking device 5 that strikes each hammer bit 41 described later. The vent 121a formed between the adjacent vents 121 (on the left side in FIG. 3) leads to the striking device 5 that strikes the hammer bit 40 in the center portion described later.

Further, as shown in FIGS. 3 and 4, the upper air flow adjusting plate 12 has fixing points at two locations in the axial circumferential direction inside the fixing hole 103.
That is, the inner peripheral surface of the fixing hole 103 is provided with engagement recesses a and b having a semicircular cross section at two locations, and the outer peripheral surface of the upper air flow adjusting plate 12 is also engaged at two locations. Concave portions c and d are provided. The interval between the engagement recesses c and d of the upper air flow adjusting plate 12 is set to be slightly wider than the interval between the engagement recesses a and b of the fixing hole 103.

  According to this structure, as shown in FIG. 3, the fixing pin 122 is inserted so as to engage with both the engaging recess a and the engaging recess c, and the upper air flow adjusting plate 12 is fixed, and as shown in FIG. Thus, in the state where the fixing pin 122 is inserted so as to engage with both the engaging recess b and the engaging recess d and the upper ventilation adjusting plate 12 is fixed, the rotational position of the upper ventilation adjusting plate 12 in the axial circumferential direction is changed. be able to. That is, the upper air flow adjusting plate 12 shown in FIG. 4 is slightly shifted in the clockwise direction as compared with FIG.

  On the outer periphery of the front casing 11, similarly to the base casing 10, large-diameter portions 110 projecting outward at five locations at equal intervals in the axial circumferential direction are provided. Each large-diameter portion 110 is positioned so as to be aligned with each large-diameter portion 104 of the base casing 10 when rotating forward in use (see FIGS. 3A and 4A).

  Further, a bolt hole 111 having a female screw portion at the bottom is formed on the top surface corresponding to each large diameter portion 110 in the front casing 11 at a position corresponding to the through hole 107 at the bottom of the work port 105 of the base casing 10. ing.

  In the front casing 11, a fixing hole 112 having an inner diameter slightly larger than the fixing hole 103 of the base casing 10 is formed in the center of the upper surface. The fixing hole 112 is fitted with a lower air flow adjusting plate 13 which is a disk-shaped hammer device main body air flow adjusting plate which constitutes a diameter adjusting means together with the upper air flow adjusting plate 12 and is fixed by bolts or the like (not shown). Has been. The lower ventilation adjustment plate 13 has the same thickness as the depth of the fixing hole 112.

  The lower ventilation control plate 13 is formed with circular holes 131 a and vents 131 penetrating the upper and lower surfaces in the same arrangement as the ventilation holes 121 a and the ventilation holes 121 of the upper ventilation adjustment plate 12. ing. The upper surface 130 of the lower air flow adjusting plate 13 is a contact surface that contacts the lower surface 120 of the upper air flow adjusting plate 12. A packing 132 is attached to the upper surface 130 to maintain airtightness between the air vents 121, 121 a, 131, 131 a and the outside by being interposed between the upper air flow adjusting plate 12 and the lower surface 120.

  A ventilation hole 134 that does not penetrate to the upper surface 130 side is provided at the center of the lower surface 133 of the lower ventilation adjustment plate 13, and the ventilation hole 134 and the ventilation hole 131 a are connected by a communication groove 135. The front casing 11 is provided with one mounting portion 15a connected to the vent hole 134 through the ventilation path 14a and five mounting portions 15 connected to the vent holes 131 through the ventilation path 14. The impact device 5 is attached to the attachment portion 15a and each attachment portion 15 as described later.

Here, a connection structure between the base casing 10 and the front casing 11 will be described.
As shown in FIG. 2, the base casing 10 and the front casing 11 are connected by the connecting bolt 106 so that the lower surface 120 of the upper air flow adjusting plate 12 and the upper surface 130 of the lower air flow adjusting plate 13 are combined. Specifically, each connection bolt 106 is inserted from each work port 105 of the base casing 10, and is screwed into each bolt hole 111 of the front casing 11 through the through hole 107 and tightened.

  As a result, the base casing 10 and the front casing 11 are connected. Note that the bottom surface of the base casing 10 and the top surface of the front casing 11 (both of which are omitted in the reference numerals) are in contact with each other even when the connection bolts 106 are tightened to the limit. The dimensions are set. Thereby, the lower surface 120 of the upper air flow adjusting plate 12 and the upper surface 130 of the lower air flow adjusting plate 13 are also substantially in contact with each other through the packing 132 and can slide in the axial circumferential direction.

  In addition, the angle range in which the base casing 10 and the front casing 11 are relatively rotatable in the axial circumferential direction is a distance that the connection bolt 106 moves relatively along each through hole 107 that is an oval hole. Limited by. Further, the base casing 10 and the front casing 11 can be rotated in either the forward or reverse direction within this angular range.

  Further, a hammer bit group 4 is provided at the tip of the front casing 11. The hammer bit group 4 is provided at five positions at equal intervals in the axial circumferential direction so as to surround the hammer bits 40 having a head 400 having a substantially circular shape when viewed from the bottom and located at one central portion. The hammer bit 41 includes a head 410 having a substantially triangular shape. Each of the hammer bits 40, 41,... Is attached to the tip of the front casing 11 so as to be movable back and forth in the axial direction of the hammer device main body 1.

  As described above, each hammer bit 40, 41... Has a striking force by the striking device 5 mounted in the front casing 11 corresponding to each hammer bit 40, 41. Added. The striking device 5 according to the present embodiment has almost the same structure as that of a known down-the-hole hammer driving mechanism (for example, the driving mechanism described in Patent Document 1). Stop to explain.

  Each striking device 5 has a cylindrical cylinder 50, and a piston 51 is accommodated in the cylinder 50 so as to be movable up and down. The piston 51 is moved into the cylinder 50 by the hammer bits 40, 41... Coming into contact with the drilled portion (or the bottom surface of the hole) and rising relative to the front casing 11 (entering inside). The hammer bits 40, 41,... Are hit when they are repeatedly pushed up and down by the pressure of the supplied compressed air and fall.

  A strip 16 is fixed to the outer peripheral portion of each large diameter portion 110 of the front casing 11 in parallel with the axial direction. In the present embodiment, the strips 16 are provided at twelve locations at equal intervals in the axial circumferential direction. And the crushed material and earth and sand (slime) which generate | occur | produce in the inside of the hole excavated at the time of excavation of the ground are formed including the inner surface of the excavated hole by the compressed air discharged or injected from the front side of each striking device 5. It is sent out to the outside of the hole (the ground surface side) through the gaps between the strips 16 to be done.

As shown in FIG. 5, the drilling hammer device H1 is combined with a rotary table 9 to form a rotary drilling device A.
The rotary table 9 includes a table main body 90 and an outrigger 91 that supports the table main body 90. The table main body 90 can hold the air tank 2 and the kelly rod 8 of the drilling hammer device H <b> 1 through the drive bush 92. Further, the drive bush 92 can apply a rotational force to the retained drilling hammer device H1.

(Function)
With reference to FIG. 1 thru | or FIG. 5, the effect | action and drilling method of the drilling hammer apparatus H1 and the rotary drilling apparatus A in the case of excavating the hole for piles in the ground are demonstrated.

  As shown in FIG. 5, first, the drilling hammer device H1 is set up at the drilling location, and the drive bushing 92 is fitted into the air tank 2 above the drilling hammer device H1, so that the drive bushing 92 is fitted to each strip 16. The engaging recess (not shown) is engaged, and the rotary table 9 is placed on a temporary scaffold 93 made of H steel.

  A necessary number of kelly rods 8 are connected to the upper portion of the air tank 2. The kelly rod 8 incorporates an air supply path (not shown), and a suspension member 81 to which a suspension wire 80 is connected is connected to the upper portion of the uppermost kelly rod 8.

  An air supply pipe 82 for supplying compressed air, which is a working fluid, to the air tank 2 is connected to the suspension 81 through the air supply path of each kelly rod 8. The suspension 81 is provided with an air swivel (not shown) so that compressed air can be supplied while rotating the drilling hammer device H1.

  Then, while the drilling hammer device H1 connected to the kelly rod 8 is suspended by a suspension wire 80 of a crane (not shown), the drive bush 92 is operated to rotate the drilling hammer device H1 in the axial direction. Compressed air is supplied from the air supply pipe 82 through the kelly rod 8 to each striking device 5 of the drilling hammer device H1.

  In the middle of supplying compressed air to each striking device 5, the compressed air blows out to the space portion 22 of the air tank 2 through the air introduction hole 210. The blown-out compressed air hits the receiving portion 30 of the air diffusing member 3 and diffuses, the pressure is substantially equalized, passes through the air intake holes 32 of the support 31 and enters the support 31.

  Then, the compressed air passes through the ventilation holes 131a and the ventilation holes 131 of the lower ventilation regulation plate 13 from the ventilation holes 121a and the ventilation holes 121 of the upper ventilation regulation plate 12, and further passes through the ventilation paths 14 and 14a. It is supplied to the device 5.

  Thereby, the hammer bit group 4 at the lower end of the drilling hammer device H1 hits the ground, and the hole is excavated. As described above, the pulverized material and earth and sand generated in the hole by excavation are sent out to the outside of the hole by the compressed air injected from each impacting device 5. Further, as the excavation progresses and the hole becomes deeper, the kelly rod 8 is sequentially added, and a hole having a predetermined depth is excavated.

  The drilling hammer device H1 can automatically adjust the flow rate of the compressed air to be supplied by changing the direction of rotation, and is generated in accordance with the strength and impact of the hammer bit group 4. The magnitude of noise and vibration can be adjusted. Hereinafter, the mechanism will be described in detail.

Please refer to FIG.
First, the upper air flow adjusting plate 12 is fixed by inserting the fixing pin 122 so that the engaging concave portion c is aligned with the engaging concave portion a on the inner peripheral surface of the fixing hole 103 and engaged with both of them.

  As shown in FIG. 3A, when a rotational force is applied in the clockwise direction to the air tank 2 of the drilling hammer device H1 by the drive bush 92, first, the base casing 10 integrated with the air tank 2 is provided. However, it rotates to a predetermined rotation angle together with the upper ventilation control plate 12 with respect to the front casing 11. When the hole wall on the rear side in the rotation direction of the through hole 107 on the side of the base casing 10 hits the connecting bolt 106 by this rotation, the front casing 11 also rotates in the clockwise direction together with the base casing 10 while maintaining this state.

  In this state, the vent holes 131a and the respective vent holes 131 of the lower ventilation regulation plate 13 are combined with the vent holes 121a and the respective vent holes 121 of the upper ventilation regulation plate 12, and the vent holes 121a and the respective vent holes 121 are combined. On the other hand, all the apertures are open (the vent apertures 121 and 121a are not open). That is, the effective size of the vent 131a and each vent 131 is maximized, and the flow rate of the compressed air sent to each striking device 5 is also maximized. Thereby, the drilling hammer device H1 can perform drilling of the hole with the maximum capacity.

  For example, when excavating in an urban area, noise and vibration generated by the drilling hammer device H1 must be kept low so as not to disturb the surrounding area. In that case, as shown in FIG. 3 (b), the drive bush 92 is rotated in the opposite direction to the case of FIG. 3 (a) and rotated in the counterclockwise direction with respect to the air tank 2 of the drilling hammer device H1. Give power.

  As a result, the base casing 10 rotates with respect to the front casing 11 together with the upper air flow adjusting plate 12 in the opposite direction to the predetermined rotation angle. By this rotation, when the hole wall on the rear side in the rotation direction of the through hole 107 on the base casing 10 side (the opposite side to the case of FIG. 3A) hits the connection bolt 106, the front casing is maintained while maintaining the state. 11 also rotates in the counterclockwise direction together with the base casing 10.

  In this state, the upper ventilation control plate 12 rotates in the reverse direction from the state shown in FIG. 3A, and the ventilation holes 121a and the ventilation holes 121 are provided with the ventilation holes 131a and 131 of the lower ventilation regulation plate 13, respectively. A part of each diameter (about 20% in the present embodiment) is open to the vent hole 121a and each vent hole 121. That is, the effective size of the vent 131a and each vent 131 is minimized in this setting, and the flow rate of the compressed air sent to each striking device 5 is also minimized. As a result, the drilling hammer device H1 performs the drilling of the hole with the minimum capacity in this setting, and the generated noise and vibration are also reduced.

Please refer to FIG.
In the present embodiment, the maximum value of the flow rate of the compressed air sent to each striking device 5 does not change, and the adjustment can be made such that the minimum value is slightly larger than in the case of FIG.
First, the upper air flow adjusting plate 12 is fixed by inserting the fixing pin 122 so that the engaging concave portion d is aligned with the engaging concave portion b on the inner peripheral surface of the fixing hole 103 and engaged therewith. Thereby, the upper air flow adjusting plate 12 is slightly shifted in the clockwise direction as compared with FIG.

  Similarly to the case of FIG. 3A, when a rotational force is applied to the air tank 2 of the drilling hammer device H1 in the clockwise direction by the drive bush 92, the vents 131a and the effective vents of the vents 131 are provided. And the flow rate of the compressed air sent to each striking device 5 is also maximized (see FIG. 4A). Thereby, the drilling hammer device H1 can perform drilling of the hole with the maximum capacity.

  The upper air flow adjusting plate 12 is slightly shifted in the clockwise direction as compared with FIG. 3, but the air vent 121a and each air vent 121 are oblong holes, so that FIG. Similarly to a), the effective size of the vent 131a and each vent 131 can be maximized.

  Further, in order to reduce the noise and vibration generated by the drilling hammer device H1, a rotational force is applied to the air tank 2 of the drilling hammer device H1 in the counterclockwise direction. Accordingly, a part of the vent holes 131a and 131 of the lower vent adjustment plate 13 are combined with the vent holes 121a and the vent holes 121 of the upper ventilation control plate 12, and the vent holes 121a and the respective vent holes 121 are combined. On the other hand, a part of each aperture (about 35% in this embodiment) is open.

  In other words, the effective size of the vent 131a and each vent 131 is minimized in this setting, but is slightly larger than in the case of FIG. 3, and the excavation capacity can be increased accordingly.

  In this way, the drilling hammer device H1 has the maximum excavation capability by applying the rotational force to the air tank 2 in the clockwise direction, and the excavation capability is minimized by applying the rotational force in the counterclockwise direction. This adjustment is automatically performed only by changing the rotation direction of the drilling hammer device H1. Moreover, in the drilling hammer device H1, the minimum value of the excavation capability can be set in two stages as described above, and finer adjustment can be performed.

Therefore, according to the rotary drilling apparatus A, when excavating a vertical hole in the ground, for example, in an urban area, the work speed can be reduced and the work can be performed with low noise and low vibration that does not disturb the surrounding area. In suburbs, forests, and the like, noise and vibration are not so much affected by the surrounding area, so work can be performed with maximum capacity with emphasis on work speed.
In this way, the work can be performed with the most suitable excavation capacity in accordance with the difference in the environment of the construction site or in accordance with the time zone during which the work is performed.

Please refer to FIG. 6 and FIG.
6 and 7, the same or equivalent portions as the drilling hammer device H1 shown in FIGS. 1 to 5 are denoted by the same reference numerals or the same numerals with alphabetic characters added thereto. A duplicate description of the structure is omitted.

In the hammer device main body 1a of the drilling hammer device H2, the upper air flow adjusting plate 12a is fixed to the fixing hole 103 by a fixing screw (not shown) or the like.
Further, the vent holes 125, 125a of the upper ventilation control plate 12a are circular holes. The connecting bolt 106a is screwed into the through-hole 107a and tightened into the through-hole 107a to fix the front casing 11a within a required angle range in a required position of the through-hole 107a, that is, in the axial circumferential direction with respect to the base casing 10a. can do. Thereby, unlike the first embodiment, the size of the effective openings of the vent 131a and each vent 131 can be adjusted steplessly.

(Function)
The drilling hammer device H2 can apply a rotational force in the axial circumferential direction by the rotary table 9 similarly to the drilling hammer device H1.
Further, since the base casing 10a and the front casing 11a are fixed by the connecting bolt 106a, unlike the drilling hammer device H1, the vent holes 131a and the vent holes 131 which have been determined once are effective. The size of the mouth, i.e. the excavation capacity, is maintained during the operation regardless of the direction of rotation. Moreover, when forward / reverse rotation is required at the same flow rate of compressed air, for example, in the case of a boulder layer or the like, drilling can be performed efficiently.

Please refer to FIG. 8 and FIG.
In FIGS. 8 and 9, the same or equivalent portions as the drilling hammer device H1 shown in FIGS. 1 to 5 are indicated by the same reference numerals or the same numerals with letters added thereto, A duplicate description of the structure is omitted.

In the drilling hammer device H3, screws 6, 6a, 6b are sequentially formed on the outer peripheral portion from the air tank 2b to the base casing 10b and the tip casing 11b of the hammer device main body 1b.
Engagement recesses 60 are formed in the screws 6, 6 a, 6 b at equal intervals every 90 ° in the axial circumferential direction. Engagement ridges (not shown) projecting to the inner surface side of a drive bush (not shown: a structure different from that of the drive bush 92) are engaged with the engagement recess 60, and rotational force is applied to the drilling hammer device H3. Is to communicate.

  Unlike the through hole 107 which is an oval hole, the through hole 108 provided in the base casing 10b is a circular hole. The base casing 10b and the front casing 11b can be fixed at fixed positions in the axial circumferential direction by tightening the connecting bolt 106a through the through hole 108 and screwing into the bolt hole 111b.

The upper air flow adjusting plate 12b is accommodated in the fixing hole 113 so as to overlap with the lower air flow adjusting plate 13b, and the lower air flow adjusting plate 13b is fixed.
Engagement recesses e are provided on the inner peripheral wall of the fixing hole 113, and adjustment recesses 123 are formed on the outer periphery of the upper air flow adjustment plate 12b in four locations.

  The upper air flow adjusting plate 12b is provided with a fixing pin 109 in the engaging concave portion e, and an arbitrary concave portion of the fixing pin 109 and the adjusting concave portion 123 is engaged, so that the axial direction relative to the lower air flow adjusting plate 13b is increased. The effective size of the vent 131a and each vent 131 can be adjusted in four stages.

(Function)
The drilling hammer device H3 is used in combination with a rotary table (not shown) different from the rotary table 9. That is, as described above, the structure of the drive bush is different in order to correspond to the drilling hammer device H3 having the screws 6, 6a, 6b.

  Further, the base casing 10b and the front casing 11b are fixed by connecting bolts 106a, and the effective size of the vent 131a and each vent 131 is the fixing hole of the front casing 11b as described above. It is adjusted by the position in the axial circumferential direction of the upper ventilation adjustment plate 12b inside 113.

  Therefore, unlike the drilling hammer device H1, the vent holes 131a and the effective sizes of the respective vent holes 131, that is, the excavation ability, are determined during the operation regardless of the rotation direction. Maintained. The drilling hammer device H3 includes the screws 6, 6a and 6b, so that the crushed bedrock and earth and sand (slime) generated during excavation can be sent out (soiled out) more smoothly to the ground surface.

  The terms and expressions used in this specification are merely explanatory and are not limiting at all, and exclude terms and expressions equivalent to the features described in this specification and parts thereof. There is no intention to do. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

A Rotary drilling device H1 Drilling hammer device 1 Hammer device body 10 Base casing 101 Fixing hole 102 Fixing hole 103 Fixing hole a Engaging recess b Engaging recess 104 Large diameter portion 105 Working port 106 Connection bolt 107 Through hole 11 Front casing 110 Large diameter portion 111 Bolt hole 112 Fixing hole 12 Upper ventilation adjustment plate 120 Lower surface 121 Ventilation port 121a Venting port 122 Fixing pin c Engaging recess d Engaging recess 13 Lower ventilation adjustment plate 130 Upper surface 131 Ventilation Port 131a Vent 132 Packing 133 Lower surface 134 Vent hole 135 Communication groove 14 Ventilation path 14a Ventilation path 15 Mounting portion 15a Mounting portion 16 Strip 2 Air tank 20 Cylindrical body 21 Upper member 210 Air introduction hole 22 Space portion 23 Connection joint 230 Joint portion 231 Air introduction hole 24 Strip Air diffusion member 30 Receiving part 31 Support body 32 Air intake hole 4 Hammer bit group 40 Hammer bit 400 Head 41 Hammer bit 410 Head 5 Blowing device 50 Cylinder 51 Piston 8 Kelly rod 80 Suspension wire 81 Suspension tool 82 Air supply pipe 9 Rotary table 90 Table body 91 Outrigger 92 Drive bush 93 Temporary scaffolding H2 Drilling hammer device 1a Hammer device body 10a Base casing 106a Connection bolt 107a Through hole 11a Front casing 111a Bolt hole 12a Upper ventilation control plate 125 Vent hole H3 Drilling hole Hammer device 1b Hammer device body 10b Base casing 108 Through hole 109 Fixing pin 11b Front casing 111b Bolt hole 113 Fixing hole e Engaging recess 12b Upper air flow adjusting plate 123 Adjustment recess 13b Lower ventilation adjustment plate 10b Base casing 2b Air tank 6, 6a, 6b Screw 60 Engagement recess

Claims (8)

A drilling hammer device for excavating the ground by transmitting a striking action of a piston operated by a working fluid to a bit,
Hammer device body (1) provided with the piston,
An air tank (2) for sending a working fluid to the hammer device body (1);
Including
Between the air tank (2) and the hammer device body (1), there is a valve element for adjusting the flow rate of the working fluid sent from the air tank (2) to the hammer device body (1).
Drilling hammer device. The valve element is
An air tank side air flow adjustment plate (12) provided on the joining side of the air tank (2) with the hammer device body (1), and having a vent;
The hammer device main body (1) is provided on the joint side with the air tank (2), and has a hammer device main body side air conditioning plate (13) having a vent,
The air tank side air flow adjusting plate (12) and the hammer device main body side air flow adjusting plate (13) rotate relative to each other around the center to change the overlapping degree of the air vents (121, 121a, 131, 131a). Adjust the flow rate of the fluid,
The drilling hammer device according to claim 1. The degree of overlap of the vents (121, 121a, 131, 131a) varies depending on the rotation direction of the air tank side air conditioning plate (12) with respect to the hammer device main body side air conditioning plate (13),
The drilling hammer device according to claim 2. A hammer device main body (1) having a piston and an air tank (2) for sending a working fluid to the hammer device main body (1), and transmitting a striking action of the piston operated by the working fluid to the bit to excavate the ground. Use a hole hammer device,
Between the air tank (2) and the hammer device body (1), the air tank (2) has a valve element for adjusting the flow rate of the working fluid sent from the air tank (2) to the hammer device body (1). And the hammer device body (1) rotate relatively around the center, and the flow rate of the working fluid to be sent changes depending on the rotation direction.
Drilling method. A drilling hammer device used in combination with a rotation imparting device (9) and excavating a vertical hole in the ground by rotating in the axial circumferential direction with the rotation imparting device (9),
Hammer device body (1),
An air tank (2) provided at the base of the hammer device main body (1), having a connecting means (23) for connecting the extension body (8), and sending working fluid to the hammer device main body (1);
With
The hammer device body (1)
A hammer bit (4, 40, 41) that is provided at the tip of the hammer device body (1) and can be moved forward and backward in the excavation direction;
Corresponding to each hammer bit (4, 40, 41), it is provided inside the drilling hammer device body (1), and the piston (51) is moved by the supplied working fluid to each hammer bit (4, 40, 41). Striking device (5)
A working fluid path (31, 121, 131, 14, 121a, 131a, 135, 134, 14a) through which the working fluid supplied from the air tank (2) to each striking device (5) is provided corresponding to each striking device (5) When,
Each working fluid path is provided by having at least a pair of contact surfaces (120, 130) provided at the start point, end point, or halfway of the working fluid path, and fixing each contact surface (120, 130) at a predetermined position by shifting the mutual positions. A diameter adjusting means (12, 121, 121a, 13, 131, 131a, a, b, c, d, 122) for adjusting the effective mouth size of
With
Drilling hammer device. The hammer device main body (1) is provided with a base casing (10) and a tip casing (11), and the contact surfaces (120, 130) of the diameter adjusting means are arranged so that the base casing (10) and the tip casing (11) are axially connected to each other. It is a structure that shifts by turning in the direction,
The axial position of the base casing (10) and the tip casing (11) during rotation must be determined in each case where the hammer device body (1) rotates in the forward direction and in the reverse direction. The positional relationship of each contact surface (120, 130) is fixed at a predetermined position, and the effective mouth size of each working fluid path formed in each case of forward and reverse rotation is different.
The drilling hammer device according to claim 5. The hammer device main body (1) is provided with a base casing (10) and a tip casing (11), and the contact surfaces (120, 130) of the diameter adjusting means are arranged so that the base casing (10) and the tip casing (11) are axially connected to each other. It is a structure that shifts by turning in the direction,
By fixing the base casing (10) and the tip casing (11) at a required angular position in the axial circumferential direction, the size of the effective mouth of each working fluid path can be adjusted.
The drilling hammer device according to claim 5. A drilling hammer device (1) according to any one of claims 1, 2, 3, 5, 6 or 7,
A rotation imparting device (9) that can hold the drilling hammer device (1) in an upright state and applies a rotational force in the axial direction to the drilling hammer device (1);
With
Rotary drilling device.

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