JP5525085B1 - Air hammer breaker - Google Patents

Abstract

An impact force output from an air hammer main body is effectively transmitted to an inner wedge and an outer wedge, and a larger crushing force by each wedge is applied to an object to be crushed.
A striking force output shaft 22 for outputting striking force generated by an air hammer body 21 and an inner wedge 23 having a taper surface tapered toward the tip are provided on the taper surface of the inner wedge 23. A pair of guide grooves 27 having the same depth is formed, a tapered surface 24a having an inclination corresponding to the guide groove 27 is formed on the inner side surface, and a pair of outer wedges 24 whose outer side surfaces are arc surfaces having the same arc diameter are provided. The guide groove 27 is slidably mounted, and a striking force receiving shaft 25 is integrally provided at the center of the end face of the inner wedge 23. The striking force output shaft 22 and the striking force receiving shaft 25 are opposed to each other. The inner wedge 23 is covered with the off-axis stopper pipe 26 over a predetermined length, and the end of the striking force receiving shaft 25 is hit by the striking force output by the striking force output shaft 22 to bring the inner wedge 23 into the outer wedge 24. It has a configuration to enter.
[Selection] Figure 1

Description

  The present invention relates to an air hammer breaker used for crushing a reinforced concrete pile head that protrudes from the ground surface.

  Generally, an air hammer breaker has an air cylinder in an air hammer body, and a piston and a hammer made of an iron alloy or the like are slidably housed inside the air cylinder. A tip tool such as a chisel is attached to one end of the air hammer breaker. By sending high-pressure air into the air cylinder, the hammer is reciprocated in the air cylinder, and the reciprocating hammer is attached to the tip tool. Colliding. In response to the kinetic energy of the collision, the tip generates a striking force, and the striking force such as concrete is crushed by the striking force (see, for example, Patent Documents 1 and 2).

  Further, as shown in FIG. 8, the hammering force output shaft 12 of the air hammer body 11 is integrally provided with an inner wedge 13 having a circular cross section having a tapered surface that tapers toward the tip. There has been proposed an air hammer breaker integrated with an inner wedge whose outer periphery is covered with a split outer wedge 16 having an inclined tapered surface 15 corresponding to the tapered surface 14 on the inner side.

  In this air hammer breaker, the outer wedge 16 is inserted into a hole 18 previously drilled in a portion exposed from the ground surface of the reinforced concrete pile 17 embedded in the ground, and the striking force generated by the air hammer main body 11 is generated. Is directly transmitted to the inner wedge 13 via the striking force output shaft 12 to expand the outer edge, thereby forcibly expanding the diameter of the hole 18 to cause cracks in the concrete pile and finally crushing. Can be achieved.

Japanese Patent No. 4340081 Japanese Patent Laid-Open No. 08-197458

  However, such a conventional air hammer breaker is an integrated type in which the air hammer body 11 and the inner wedge 13 are connected by a striking force output shaft, and is directly transmitted to the inner wedge. For this reason, the expansion force acting on the outer wedge 13 within the hole 18 is limited to the striking force generated by the air hammer body 11, and is not an efficient striking force application method for the concrete pile 17. In other words, the striking force from the air hammer main body 11 becomes the crushing force as it is (substantially in a one-to-one relationship), and is not an efficient method of using the striking force.

  The present invention solves the conventional problems as described above, and the purpose of the present invention is to efficiently transmit the striking force output from the air hammer body to the inner and outer wedges, An object of the present invention is to obtain an air hammer breaker capable of realizing a large crushing force on a crushing object such as a concrete pile with a simple configuration.

  In order to achieve the above object, an air hammer breaker according to the present invention has one end slidably provided in a cylinder constituting the air hammer body, and the striking force generated in the cylinder is transferred to the outside of the cylinder. A striking force output shaft for output, a substantially cylindrical inner wedge having a tapered surface tapered toward the tip, and a taper surface of the inner wedge having the same depth formed in the longitudinal direction of the inner wedge. A pair of guide grooves and an inclined surface corresponding to the guide groove on the inner surface, the outer surface that is slidably attached to the guide groove and faces the inner tapered surface has the same arc diameter A pair of outer wedges, a striking force receiving shaft integrally provided at the center of the end surface on the side where the maximum diameter portion of the inner wedge, and the striking force output shaft and the striking force receiving shaft are opposed to each other. Specified end And an off-axis stopper pipe that covers the outer edge, and the end of the impact force receiving shaft is hit by the impact force output by the impact force output shaft to press-fit the inner wedge into the outer wedge. And

  With this configuration, the striking force generated by the air hammer body is directly transmitted to the striking force output shaft, and the striking energy transmitted to the striking force output shaft is applied to the stationary striking force receiving shaft opposite to the striking force output shaft. Reportedly. For this reason, the impact force receiving shaft is suddenly accelerated from the stationary state under the impact of the impact energy, in other words, repelling energy with respect to the impact force output shaft is obtained and knocked out toward the tip of the inner wedge. As a result, the outer wedge mounted so that the outer periphery is in contact with the hole drilled in the concrete pile or the like is forcibly expanded in the outer diameter direction and pushes the hole. As a result, the concrete pile cracks around the hole and is further crushed. Further, the off-axis stop pipe supports the striking force output shaft and the striking force receiving shaft in a substantially concentric arrangement state, and reliably and efficiently transmits the striking force of the striking force output shaft to the striking force receiving shaft.

  Moreover, the air hammer breaker according to the present invention is characterized in that the off-axis stopper pipe is attached to one of the opposing ends of the impact force output shaft and the impact force receiving shaft. This configuration allows the relative movement of the striking force output shaft and the striking force receiving shaft while restricting the movement of the off-axis stopper pipe, thereby more reliably transmitting the striking force from the striking force output shaft to the striking force receiving shaft. Can be.

  According to the present invention, the impact force output from the air hammer body is converted into impact energy between the impact force output shaft and the impact force receiving shaft arranged with a predetermined gap, and this impact energy is converted into the inner wedge and the outer wedge. By effectively transmitting, each wedge can exert a greater crushing force on the crushing object.

  The present invention has been briefly described above. Further, the best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

It is a perspective view which shows the air hammer breaker by embodiment of this invention. FIG. 2 is a plan view showing a partially broken air hammer breaker in FIG. 1. It is a front view which shows the wedge part in FIG. It is AA sectional drawing of the wedge part in FIG. It is explanatory drawing which shows the use condition of the air hammer breaker in FIG. FIG. 3 is a cross-sectional plan view showing a state where a cover is covered on an edge portion in FIG. It is BB sectional drawing of the edge part and cover in FIG. It is explanatory drawing which shows the use condition of the conventional air hammer breaker.

  Hereinafter, an air hammer breaker according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

  FIG. 1 is a perspective view showing the entire air hammer breaker according to the present embodiment. This air hammer breaker has an air hammer main body 21, a striking force output shaft 22, an inner wedge 23, an outer wedge 24, and an impact. A force receiving shaft 25 and an off-axis stopper pipe 26 are provided. Among these, the air hammer main body 21 has a hammer (not shown) that slides in a reciprocating manner in the cylinder 21a. By sending a fluid such as air into the cylinder 21a at a high pressure, the hammer can be reciprocated. ing. Then, by operating (collising) the reciprocating hammer on the striking force output shaft 22, the striking force output shaft imparts (applies) striking force to a crushing object such as a concrete pile, and further crushes it. be able to.

  A part of the striking force output shaft 22 is slidably supported in the cylinder 21a, and the end of the striking force output shaft 22 in the cylinder is fixed to a piston or the like that is struck by the hammer. The other end portion of the striking force output shaft 22 extends outside the cylinder 21a.

  The inner wedge 23 has a substantially cylindrical block shape having a tapered surface 23a that tapers toward the tip. The two opposing surfaces of the tapered surface 23a have the same depth and length in the longitudinal direction of the inner wedge 23. A guide groove 27 having a width is formed. The space between the tapered surfaces 23a of the inner wedge 23 is a flat surface 23b. In these guide grooves 27, the end portion which is the maximum diameter portion of the inner wedge 23 is a release portion c, and the tapered portion is a weir portion d for preventing the outer wedge 24 described later from coming off.

  The outer wedge 24 has an inclined taper surface 24a corresponding to each guide groove 27 on the inner surface, is mounted so as to be slidable in contact with the guide groove 27, and is opposed to the inner tapered surface 24a. Are arc surfaces 24b having the same arc diameter. The overall length of the outer wedge 24 is approximately half the length of the inner wedge, and the width is an appropriate size that is approximately half or more than the inner wedge 23.

  The striking force receiving shaft 25 is integrally provided at the center portion of the end surface on the side where the inner wedge 23 has the maximum diameter. The tip portion of the striking force receiving shaft 25 is disposed opposite to the end portion (tip portion) of the striking force output shaft 22 when the wedges 23 and 24 are driven by the air hammer body 21. Further, the off-axis stopper pipe 26 covers each end of the striking force output shaft 22 and the striking force receiving shaft 25 facing each other over a predetermined length.

  This off-axis stopper pipe 26 acts to transmit the striking force applied to the striking force output shaft 22 to the striking force receiving shaft 25 without loss. For this reason, the end portions of the striking force output shaft 22 and the striking force receiving shaft 25 that are opposed to each other with an interval H are freely moved relative to each other within a predetermined axial stroke within the off-axis stopper pipe 26, and It is supported with a predetermined gap G so that relative movement is restricted in the radial direction.

  The off-axis stopper pipe 26 may be fixed to either the striking force output shaft 22 or the striking force receiving shaft 25. In this case, it is possible to prevent the off-axis stopper pipe 26 from being displaced from the ends of the shafts 22 and 25. That is, the covering state of the striking force output shaft 22 and the striking force receiving shaft 25 by the off-axis stopper pipe 26 can be reliably maintained. As a result, the transmission of the striking force from the striking force output shaft 22 to the striking force receiving shaft 25 can be made more reliable.

Next, a method of using the air hammer breaker having the above configuration will be described.
First, the aforementioned air hammer body 21, inner wedge 23, outer wedge 24,
An off-axis stopper pipe 26 is prepared, and the off-axis stopper pipe 26 is attached to each end of the impact force output shaft 22 and the impact force receiving shaft 25 as shown in FIGS. When the off-axis stopper pipe 26 is fixed to one of the striking force output shaft 22 and the striking force receiving shaft 25, the end of the striking force output shaft 22 or the striking force receiving shaft 25 on the non-fixed side is pivoted. Insert into the stopper pipe 26. Then, the end portions of the striking force output shaft 22 and the striking force receiving shaft 25 are opposed to each other with a predetermined gap.

Subsequently, the outer wedge 24 is mounted in each guide groove 27 of the inner wedge 23 so that the base portion thereof can slide. Then, the inner wedge 23 to which the outer wedge 24 is attached is inserted into the hole 16 previously drilled in the concrete pile 17 as shown in FIG. 5, and the driving of the air hammer body 21 is started. In this drive state, the air hammer body 21 is manually pressurized in the axial direction of the striking force output shaft 23.

By this pressurizing operation, the outer edge is expanded in diameter by indirectly transmitting the striking force generated by the air hammer body 11 to the inner wedge 13 via the striking force output shaft 22 and / or the striking force receiving shaft 25. The diameter of the hole 18 of the concrete pile 17 is forcibly expanded, the concrete pile is cracked, and finally it is crushed. That is, the striking force applied to the striking force output shaft 22 from the air hammer main body 21 is converted into collision (impact) energy, and the striking of the inner wedge 23 that is in sliding contact with the stationary outer wedge 24 held in the hole 18. Applied to the end of the force receiving shaft 25.

That is, the striking force is converted into collision energy between the striking force output shaft and the striking force receiving shaft, and the striking force receiving shaft 25 that has been stationary is driven in the direction of the hole 18 in a sudden acceleration state in response to the collision energy. . The outer wedge 24 mounted in the guide groove 27 having a tapered surface moves outward (in FIG. 5, upward and downward directions, diameter increasing direction). As a result, the outer wedge 24 forcibly expands the hole 18, causes a crack in the concrete pile 17 around the hole 18, and further leads to crushing.

  In this way, the impact force output from the air hammer body 21 is converted into impact energy between the impact force output shaft 22 and the impact force receiving shaft 25 arranged with a predetermined gap H, and this impact energy is converted into the inner wedge 23. By effectively transmitting to the outer wedge 24, each wedge 23, 24 can exert a greater crushing force on the concrete pile 17 that is the object to be crushed.

  It should be noted that the inner wedge 23 and the outer wedge 24 are separate parts manufactured individually, and it is convenient for storage, storage, transportation, and sale if they can be handled as a unit. Therefore, as shown in FIGS. 6 and 7, it is desirable to wrap these with a cylindrical cover 28 in a state where the outer wedge 24 is attached to the guide groove 27 of the inner wedge 23.

  The cover 28 has an opening 28a that is largely open at one end, and a retaining edge 28b that protrudes in the inner circumferential direction at the other end. The unitization of the inner wedge 23 and the outer wedge 24 by the cover 28 facilitates handling, storage, storage, transportation, etc. of the wedges 23, 24 and avoids the loss of each wedge 23, 24 unit. can do.

  As described above, according to the present embodiment, one end of the striking force output shaft 22 that outputs the striking force generated in the cylinder 21a to the outside of the cylinder 21a in the cylinder 21a constituting the air hammer body 21. And a substantially cylindrical inner wedge 23 having a tapered surface tapered toward the tip, and a pair of guide grooves 27 having the same depth on the tapered surface of the inner wedge 23. A pair of outer sides formed in the longitudinal direction of the inner wedge 23 and having an inclined taper surface 24a corresponding to the guide groove 27 on the inner surface, and an outer surface facing the taper surface 24a being an arc surface having the same arc diameter A wedge 24 is slidably attached to the guide groove 27, and a striking force receiving shaft 25 is integrally provided at the center of the end surface of the inner wedge 23 which is the largest diameter portion. The end portions of the striking force receiving shaft 25 are covered by the off-axis stopper pipe 26 over the predetermined lengths of the striking force receiving shaft 25 and the striking force output from the striking force output shaft 22. And the inner wedge 23 is press-fitted into the outer wedge 24.

  Therefore, the striking force transmitted from the air hammer main body 21 is transmitted to the striking force output shaft 22, and the striking energy transmitted to the striking force output shaft 22 is transmitted to the striking force receiving shaft 25 in a stationary state by hitting it. It is done. The striking force receiving shaft 25 is suddenly accelerated from the stationary state under the impact of the striking energy, in other words, it is knocked out toward the tip of the inner wedge 23 so as to obtain repulsive energy with respect to the striking force output shaft 22. For this reason, the outer wedge 24 mounted so that the outer periphery is in contact with a hole drilled in a concrete pile or the like is forcibly expanded in the outer diameter direction, and the hole is expanded. As a result, there is an effect that a crack is generated around the hole in the concrete pile, and further, it is crushed. The off-axis stopper pipe 26 supports the striking force output shaft 22 and the striking force receiving shaft 25 in a substantially concentric arrangement, and transmits the striking force of the striking force output shaft 22 to the striking force receiving shaft 25 reliably and efficiently. The effect that it can be obtained.

  The air hammer breaker of the present invention converts a striking force output from the air hammer body into a collision energy between a striking force output shaft and a striking force receiving shaft arranged with a predetermined gap, and this collision energy is converted into an inner wedge and an outer portion. By effectively transmitting to the wedge, each wedge has an effect that a greater crushing force can be exerted on the object to be crushed, which is useful for applications such as crushing the head of a reinforced concrete pile.

21 Air Hammer Main Body 22 Strike Force Output Shaft 23 Inner Wedge 24 Outer Wedge 25 Stroke Force Receiving Shaft 26 Off-axis Stop Pipe 27 Guide Groove 28 Cover

Claims (2)

A striking force output shaft that is slidably provided at one end in a cylinder constituting the air hammer body, and that outputs striking force generated in the cylinder to the outside of the cylinder,
A substantially cylindrical inner wedge having a tapered surface that tapers toward the tip;
A pair of guide grooves of the same depth formed in the longitudinal direction of the inner wedge on the tapered surface of the inner wedge;
A pair of outer wedges having a tapered surface corresponding to the guide groove on the inner surface, the outer surface facing the inner taper surface is slidably attached to the guide groove, and has the same arc diameter. When,
A striking force receiving shaft provided integrally at the center of the end surface on the side that becomes the maximum diameter portion of the inner wedge,
An off-axis stopper pipe that covers each end of the striking force output shaft and the striking force receiving shaft facing each other over a predetermined length;
With
An air hammer breaker characterized in that an inner wedge is press-fitted into an outer wedge by hitting the end portion of the impact force receiving shaft with a striking force output from the striking force output shaft.   2. The air hammer breaker according to claim 1, wherein the off-axis stopper pipe is attached to any one of opposing ends of the impact force output shaft and the impact force receiving shaft.

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