Rock breaking device and method for supplying lubricant to rock breaking device

Abstract

To provide a rock breaking device capable of efficiently breaking rocks from a surface of objects to be broken, such as bedrock, boulders, and concrete structures, to a depth greater than a human height, and a lubricant supplying method capable of satisfactorily supplying a lubricant to the rock breaking device.SOLUTION: The present invention has a first blade member and a second blade member arranged facing each other with a wedge tip of a wedge member in between. The first blade member has a planar contact portion capable of coming into planar contact with an inner wall surface of a hole over at least 2 m or more in the hole drilling direction, and the second blade member has a linear contact portion capable of coming into linear contact with the inner wall surface of the hole in parallel with the hole drilling direction over at least 2 m or more in the hole drilling direction on the opposite side of the planar contact portion across the wedge tip. As the wedge member is inserted into the hole, the linear contact portion presses against the inner wall surface of the hole, creating a crack around the hole located on the opposite side of the planar contact portion across the wedge tip.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a rock breaking device that breaks up objects to be crushed, such as rock mass, boulders, and concrete structures, by generating cracks around holes formed in the objects to be crushed, and a method of supplying lubricant to the rock breaking device. [Background technology]

[0002] The applicant of the present application has proposed many crushing techniques for crushing objects to be crushed, such as bedrock, boulders, and concrete structures, and rock breaking devices suitable for the techniques (for example, Patent Documents 1 to 7). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4636294 [Patent Document 2] Patent No. 4961574 [Patent Document 3] Patent No. 5034001 [Patent Document 4] Patent No. 5145503 [Patent Document 5] Patent No. 5145504 [Patent Document 6] Patent No. 5352807 [Patent Document 7] Patent No. 5352807 Summary of the Invention [Problem to be solved by the invention]

[0004] According to conventional rock breaking technology, the maximum depth at which cracks can be introduced in one rock breaking process is about 1.5 m, and in order to break rock to the desired depth, the rock breaking process must be repeated multiple times. From the viewpoint of work efficiency, it is desirable to perform rock breaking in a range deeper than a human height, for example, a depth of 2 m or more, in one rock breaking process.

[0005] In addition, it has been difficult to directly apply the rock breaking technology to the breaking of rocks, boulders, concrete structures, and other objects exposed above the water surface of rivers, lakes, and oceans. For example, as shown in Fig. 1(a), in a case where the rock 2 rises over a wide area and narrows the width of the river 1, it is desirable to remove the rock 2 to widen the area through which floodwaters flow. There are also plans to break a part of the rock 2 to create a reservoir or the like. In such a case, it is necessary to break the rock deep in the area of ​​the rock facing the river 1 (hereinafter referred to as the "waterside area"), a range deeper than a human height, for example, 2 m or more. Here, in the waterside area, it is practically difficult to repeat the rock breaking process multiple times as described above. This is because when the first rock breaking process is performed, water flows into the drilled hole through the crack area, making the next rock breaking process difficult. Therefore, it is necessary to break the rock to the desired depth in the waterside area by a single rock breaking process.

[0006] In order to satisfy these demands, it is conceivable to scale up the rock breaking device proposed by the applicant in the longitudinal direction, but the following problems arise. The rock breaking device inserts a wedge member between two blade members inserted into a drilled hole in the rock, and applies a force to the wedge member along the drilling direction to press the blade member against the inner wall of the drilled hole to crack the rock. Therefore, by scaling up, the contact area between the blade members constituting the rock breaking device and the inner wall of the drilled hole increases. Therefore, the stress per unit area that presses the inner wall of the drilled hole by the blade member decreases. To compensate for this, one solution is to increase the force applied to the wedge member by increasing the size of, for example, a hydraulic jack. However, there is a certain limit to the size of a hydraulic jack, and the above problem has not been solved at present.

[0007] Furthermore, as the scale of rock breaking equipment increases, it is becoming increasingly important to provide technology for uniformly and efficiently supplying lubricant between the blade members and the wedge members.

[0008] This invention has been made in consideration of the above-mentioned problems, and aims to provide a rock-breaking device that can efficiently break rocks from the surface of objects to be crushed, such as bedrock, boulders, and concrete structures, to a depth greater than a human height, i.e., over a range of 2 m or more, and a lubricant supply method that can effectively supply lubricant to the rock-breaking device. [Means for solving the problem]

[0009] The first aspect of the present invention is a rock breaking device in which a wedge tip of a wedge member having a tapered shape and a first blade member and a second blade member arranged opposite each other with the wedge tip in between are inserted into a hole formed in a material to be crushed in a hole drilling direction, and the first blade member and the second blade member move radially outward of the hole so as to move away from each other as the wedge member is inserted into the hole drilling direction, thereby breaking up rock around the hole. The first blade member is arranged to extend over at least 2 m in the hole drilling direction. The first blade member has a planar abutment portion that can abut in a planar manner against the inner wall surface of the hole, and the second blade member has a linear abutment portion that can abut in a linear manner against the inner wall surface of the hole parallel to the hole drilling direction over a distance of at least 2 m in the hole drilling direction on the opposite side of the planar abutment portion across the wedge tip, and by moving the first blade member and the second blade member radially outward, a crack is created around the hole drilled located on the opposite side of the planar abutment portion across the wedge tip from the area where the linear abutment portion abuts against the inner wall surface of the hole.

[0010] In addition, a second aspect of the present invention is a lubricant supplying method for supplying lubricant to the above-mentioned rock breaking device, characterized in that before inserting the first blade member, the second blade member and the wedge tip portion into the drilling hole, lubricant is injected between the wedge tip portion and the first blade member and between the wedge tip portion and the second blade member while the first blade member, the second blade member and the wedge tip portion are in a horizontal position with the planar abutment portion facing downward or upward. Effect of the Invention

[0011] The rock-breaking device of the present invention can efficiently break rock around a hole formed in the object to be crushed, such as bedrock, boulders, or concrete structures, over a range from the surface to a depth greater than a human height.

[0012] Furthermore, according to the method of supplying lubricant to a rock breaking device of the present invention, the lubricant can be supplied to the rock breaking device in an excellent manner. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing before and after a construction site where a crushing method using an embodiment of a rock breaking device according to the present invention was carried out. FIG. [Figure 2A] FIG. 1 is a diagram showing a schematic diagram of a part of a process in a crushing method using an embodiment of a rock breaking device according to the present invention. [Figure 2B] FIG. 1 is a diagram showing a schematic diagram of a part of a process in a crushing method using an embodiment of a rock breaking device according to the present invention. [Figure 2C] FIG. 1 is a diagram showing a schematic diagram of a part of a process in a crushing method using an embodiment of a rock breaking device according to the present invention. [Figure 2D] FIG. 1 is a diagram showing a schematic diagram of a part of a process in a crushing method using an embodiment of a rock breaking device according to the present invention. [Figure 2E] FIG. 1 is a diagram showing a schematic diagram of a part of a process in a crushing method using an embodiment of a rock breaking device according to the present invention. [Figure 2F] FIG. 1 is a diagram showing a schematic diagram of a part of a process in a crushing method using an embodiment of a rock breaking device according to the present invention. [Diagram 3] FIG. 1 is a diagram showing a first embodiment of a rock breaking device according to the present invention. [Figure 4] 4 is a diagram showing a configuration of a blade member constituting a rock breaking tool of the rock breaking device shown in FIG. 3. [Diagram 5] FIG. 2 is a diagram showing a schematic diagram of the state of each part during rock breaking processing. [Figure 6] 4 is a schematic diagram showing the opposing relationship of grooves provided in a blade member and a wedge member constituting the rock breaking tool shown in FIG. 3. FIG. [Figure 7] FIG. 4 is a schematic diagram showing a lubricant supply process performed before rock breaking by the rock breaking device shown in FIG. 3. [Figure 8]11A and 11B are diagrams showing the surface state of the wedge member after the lubricant is supplied. [Figure 9] 11A and 11B are diagrams showing another example of a rock breaking tool used in the rock breaking device according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] FIG. 1 is a diagram showing a schematic diagram of a site where a crushing method using an embodiment of a rock breaking device according to the present invention was performed before and after the work, in which FIG. 1(a) shows the before work and FIG. 1(b) shows the after work. In FIG. 1, as an example of a crushing method, a rock mass 2 that is uplifted over a wide area in the basin of a river 1 is shown as an example of a target of the crushing method. Due to the presence of this rock mass 2, the width of the river 1 is locally narrowed, and it is exposed to the threat of flooding. Therefore, it is sometimes planned to use a part of the rock mass 2 to install flood control facilities, or to remove the rock mass 2 to lower the water level of the river 1. In order to smoothly proceed with such a plan, it has been proposed to remove the central area 2a of the rock mass 2 as shown in FIG. 1(b), while crushing and backfilling the area of ​​the rock mass 2 facing the river 1, that is, the waterside adjacent area 2b. It is desirable to secure a width for the waterside adjacent area 2b so that construction machinery, transport vehicles, etc. can travel and various work can be performed. In this embodiment, a pit forming process, a mound forming process, and a crushing and backfilling process are carried out on a rock mass 2, which is an example of the "object to be crushed" of the present invention, as described in detail below. Hereinafter, one embodiment of the crushing method according to the present invention will be described with reference to the drawings.

[0015] 2A to 2F are diagrams showing a part of the process of the crushing method using one embodiment of the rock breaking device according to the present invention. In these drawings, the rock 2 is connected to the embankment 1b of the river 1, and construction machines and transport vehicles can run between the embankment 1b and the rock 2 via the connection part 2c. Of course, if the rock 2 is separated from the embankment 1b, a temporary bridge may be built between them.

[0016] FIG. 2A shows the state of the rock mass after the pit formation process has been carried out, with (a) being a plan view from above and (b) being a cross-sectional view taken along line BB. In this embodiment, as shown in (a), a central portion 2e of the rock mass 2 is removed, leaving behind an area 2d where construction machinery, transport vehicles, etc. can travel. As this central portion 2e is not in direct contact with the river 1, it is possible to crush and remove the central portion 2e using conventional crushing and removal techniques. For example, the "Core Removal Cutter Arrow Method" (available on the Internet) proposed by the applicant of this application may be used.<URL:http: / / kamishimagumi.co.jp / technique / sinnuki / 15sinnukipanfu.pdf> ) can be used. The specific work content is as follows: The central portion and the outer periphery of the surface of the central portion 2e are drilled with a crawler drill. After setting the core-removing seri arrow (Patent Document 3) in the above-mentioned drilling hole, the core-removing seri arrow is subjected to a cycle of "crushing → rotation → crushing → rotation" four times, and the first layer is crushed in all directions as a flat surface. Repeat the same crushing process for layers 2 to n. - Lift it up with construction machinery such as a backhoe and remove the debris from the central part 2e. As a result, as shown in FIG. 2A(b), a pit 3 having a depth H approximately equal to the riverbed of the river 1 is formed (pit forming step).

[0017] Next, as shown in FIG. 2B, a transport vehicle or the like is driven along the area 2d to form a mound 41 in the facing area 31 of the pit 3 facing the water's edge adjacent area 2b (mound formation process). This mound 41 corresponds to an example of the "first mound" of the present invention. In the crushing and backfilling process executed following the mound formation process, a part of the water's edge adjacent area 2b is designated as a planned crushing area, and work is carried out (FIGS. 2C to 2F). Here, the first mound 41 is formed only in the facing area 31 corresponding to the planned crushing area. As a result, an area where construction machinery, transport vehicles, etc. can travel and work (hereinafter referred to as the "travel and work area") is formed on the upper surface of the first mound 41, and is used as described below.

[0018] Here, a portion of the first mound 41 has been described, but of course the first mound 41 may be formed all at once corresponding to the entire periphery of the water's edge adjacent area 2b before carrying out the crushing and backfilling process described next. Also, the first mound 41 may be formed in multiple steps, and the crushing and backfilling process described next may be carried out each time the first mound 41 is formed.

[0019] Next, the crushing and backfilling process will be described. First, as shown in FIG. 2C, a crawler drill 5, a rock breaking device 6 according to the first embodiment of the present invention, and a hydraulic excavator 7 (sometimes called a "yumbo") are traveled and positioned around the planned crushing area 2b1, which is the first area to be crushed and backfilled in the water's edge adjacent area 2b. Among these, the crawler drill 5 is fixed to the upper surface of the area 2d while adjacent to the planned crushing area 2b1, as shown in FIG. 2C (d), and forms a drilled hole 8 in the planned crushing area 2b1 (drilled hole forming operation). Note that, although only one drilled hole 8 is shown in FIG. 2C, actually, a plurality of drilled holes are formed at preset intervals throughout the planned crushing area 2b1. This is the same for the other planned crushing areas.

[0020] The rock breaking device 6 travels on the travelling work area and is fixed near the planned crushing area 2b1. The rock breaking device 6 then inserts the tip of the rock breaking tool 61 into the drilled hole 8 and breaks the rock around the drilled hole 8 to crush it (crushing operation). More specifically, the rock breaking device 6 has a crane vehicle, which is an example of a construction machine. As shown in the figure, this crane vehicle is parked at a position adjacent to the planned crushing area 2b1 where the drilled hole 8 has been formed, and extends its arm from that position toward the space above the drilled hole 8. A wire hangs down from the tip of the arm, and the rock breaking tool 61 is attached to the tip of the wire. The detailed configuration and operation of the rock breaking device 6 will be described later.

[0021] The hydraulic excavator 7 travels on the travelling work area and is fixed near the planned crushing area 2b1. Then, the rock breaking device 6 excavates the planned crushing area 2b1 where the cracks have been introduced, and all or part of the crushed pieces are removed from the planned crushing area 2b1, and as shown in FIG. 2D, the planned crushing area 2b1 is filled with earth 42 (backfilling operation). This earth 42 corresponds to an example of the "second earth" of the present invention. At this time, in this embodiment, no earth is formed in a part of the planned crushing area 2b1, more specifically, in the part close to the crawler drill 5, and a waterside area (reference numeral 1a in FIG. 2E) is formed. Therefore, the next planned crushing area (reference numeral 2b2 in FIG. 2E) faces not only the river 1 but also the waterside area 1a, and the free surface of the next planned crushing area (reference numeral 2b2 in FIG. 2E) is expanded.

[0022] Next, the area (2b2 in FIG. 2E) adjacent to the planned crushing area 2b1 along the water's edge where the crushing and backfilling process was carried out by the crawler drill 5, rock breaking device 6, and hydraulic excavator 7 is set as the next planned crushing area, and the crushing and backfilling process is carried out. Here, the location of the hydraulic excavator 7 is changed due to the presence of the water's edge area, but the crawler drill 5, rock breaking device 6, and hydraulic excavator 7 are placed around the planned crushing area 2b2, and the same process as the crushing and backfilling process for the planned crushing area 2b1 is carried out.

[0023] Here, the crawler drill 5 forms a hole 8 in the planned crushing area 2b2 while being fixed to the upper surface of the area 2d adjacent to the planned crushing area 2b1 as shown in FIG. 2D (hole drilling operation). The rock breaking device 6 travels on the traveling work area and is fixed near the planned crushing area 2b1. Then, the rock breaking device 6 inserts the tip of the rock breaking tool 61 into the hole 8 and breaks the rock around the hole 8 to crush it (crushing operation). Furthermore, the hydraulic excavator 7 moves from the traveling work area to the bank 42 and is fixed near the planned crushing area 2b2. Then, the rock breaking device 6 excavates the planned crushing area 2b2 where the cracks have been introduced, removes all or part of the crushed pieces from the planned crushing area 2b1, and as shown in FIG. 2F, the bank 42 is formed in the planned crushing area 2b2 (backfilling operation), and the backfilled area is expanded along the water's edge adjacent area 2b (see FIG. 1).

[0024] By moving the area to be crushed along the water's edge in this way and carrying out the above-mentioned crushing and backfilling process over the entire area adjacent to the water's edge, it is possible to crush the bedrock 2 while minimizing contact with the river 1, and create a structure as shown in Figure 1(b).

[0025] In addition, by providing the mound 41 (traveling work area), the crushing and backfilling process is always performed with the mound 41 interposed between the planned crushing areas 2b1, 2b2, ... and the pit 3. Therefore, even if the planned crushing areas 2b1, 2b2, ... are crushed, it is possible to effectively prevent water from entering the pit 3 from the crushed planned crushing areas 2b1, 2b2, .... In addition, since the area where the planned crushing areas 2b1, 2b2, ... contact the river 1 is minimized, it is possible to suppress soil and sand flowing into the river 1 during the crushing and backfilling process, and effectively prevent environmental destruction.

[0026] Next, the configuration of the rock breaking device 6 used in the above-mentioned crushing and backfilling process and the rock breaking process performed by the rock breaking device 6 will be described with reference to Figs.

[0027] FIG. 3 is a diagram showing a first embodiment of the rock breaking device according to the present invention, and shows the configuration excluding the crane vehicle and the wire extending from the crane vehicle. The enlarged view shown in the upper right part of the figure is the XZ cross section of the upper end part of the blade member, and the enlarged view shown in the lower right part is the XY cross section at the tip region. FIG. 4 is a diagram showing the configuration of the blade member constituting the rock breaking tool of the rock breaking device shown in FIG. 3. FIG. 5 is a diagram showing the state of each part during rock breaking processing. In these figures and the figures shown later, in order to clarify the positional relationship of each part of the device, the hole drilling direction in which the holes are drilled is called the "Z direction", the arrangement direction in which the blade members and wedge members are arranged among the directions perpendicular to the hole drilling direction Z is called the "X direction", and the direction perpendicular to both the arrangement direction X and the hole drilling direction Z is called the "Y direction".

[0028] The rock breaking tool 61 is composed of one wedge member 62 and two blade members 63, 64. However, in this embodiment, since it is necessary to break the rock in the planned crushing area 2b1 in the hole drilling direction Z to a depth H approximately equal to the riverbed of the river 1 in one rock breaking process, the rock breaking tool 61 is longer in the hole drilling direction Z than conventional rock breaking tools.

[0029] The wedge member 62 and the blade members 63, 64 constituting the rock breaking tool 61 each have a shaft structure that extends long in the hole drilling direction Z, and are longer than the depth H (in this embodiment, it is assumed that the depth is 3.5 m, which is deeper than the height of an average person HM). More specifically, the tip of the wedge member 62 (hereinafter referred to as the "wedge tip") is provided with a first wedge-side inclined surface 621 inclined with respect to the hole drilling direction Z and a second wedge-side inclined surface 622 inclined in the opposite direction to the inclination direction of the first wedge-side inclined surface 621, and the tip as a whole has a tapered shape. In order to perform rock breaking processing, as shown in Figures 3 and 5, the tip of the wedge member 62 is capable of being inserted and removed into the hole 8 with the first wedge side inclined surface 621 facing toward a first wall portion of the inner wall surface of the hole 8 on the side opposite the water's edge (the -X direction side in Figure 3) and the second wedge side inclined surface 622 facing toward a second wall portion of the inner wall surface of the hole 8 on the water's edge side (the +X direction side in Figure 3).

[0030] The blade member 63 corresponds to an example of the "first blade member" of the present invention, and has a first blade side inclined surface 631 that can slide against the first wedge side inclined surface 621, and a first abutment surface 632 that can abut against the first wall surface portion in a planar manner. The first blade side inclined surface 631 and the first abutment surface 632 extend in the hole drilling direction Z so as to be the same as or longer than the depth H of the pit 3. The first abutment surface 632 corresponds to an example of the "planar abutment portion" of the present invention.

[0031] The blade member 64 corresponds to an example of the "second blade member" of the present invention, and has a second blade side inclined surface 641 that can slide against the second wedge side inclined surface 622, and three linear contact areas 647-649 that can linearly contact the second wall surface area on the (+X) direction side of the inner wall surface of the hole being drilled. Similar to the first blade member 63, the second blade side inclined surface 641 and the linear contact areas 648, 649 are also extended so as to be equal to or longer than the depth H of the pit 3 in the hole drilling direction Z.

[0032] On the other hand, as shown in FIG. 4, the linear contact portion 647 has an extension length of about 3 m in the drilling direction Z, and is provided in the tip region R from the end of the tip side (lower side in FIG. 4) of the second blade member 64 toward the rear end side. In this tip region R, as shown in the enlarged lower view (cross-sectional view at the tip region R) in FIG. 3, three linear contact portions 647-649 are provided symmetrically with respect to an imaginary plane VP parallel to the arrangement direction Y in which the first blade member 63, the wedge member 62, and the second blade member 64 are arranged in the drilling hole 8, and two linear contact portions 648, 649 are provided symmetrically with respect to the imaginary plane VP on the (-Z) direction side of the tip region R. Note that the reference numeral 642a in FIG. 3 and FIG. 4 denotes a reinforcing rib for preventing the linear contact portion 647 from collapsing in the Y direction, and the number and arrangement of the reinforcing ribs are arbitrary.

[0033] As shown in the partially enlarged view of FIG. 4, the linear contact portions 647-649 are finished in an approximately isosceles trapezoidal shape in consideration of wear with the inner wall surface of the drilled hole 8. Therefore, the contact state between each of the linear contact portions 647-649 and the drilled hole inner wall surface is not thin line-like, but thick line-like or thin strip-like. However, even if the contact areas are added up, the total area is significantly smaller than the area where the first contact surface 632 contacts the drilled hole inner wall surface. Therefore, the contact state between each of the linear contact portions 647-649 and the drilled hole inner wall surface is considered to be substantially linear, and therefore, in this specification, the contact state between each of the linear contact portions 647-649 and the drilled hole inner wall surface is expressed as "linear" as described above.

[0034] When performing rock breaking using the rock breaking tool 61 configured in this way, as shown in Figures 3 and 5, the two blade members 63, 64 are arranged so that the inclined surfaces 631, 641 face each other. By arranging the blade members 63, 64 in this way, the space sandwiched between the inclined surfaces 631, 641 becomes tapered toward the tip side of the blade members 63, 64. The tip of the wedge member 62, which is configured to have a tapered shape similar to this space, that is, the wedge tip, is inserted into this tapered space. Furthermore, the rear end of the wedge member 62 is connected to a piston rod (not shown) that moves forward and backward in the hole drilling direction Z by supplying and discharging oil to the hydraulic jack 65. Then, as shown in Figure 3, the rock breaking tool 61 and the hydraulic jack 65 are positioned above the hole drilling 8 while being aligned parallel to the hole drilling direction Z. At this time, a rock breaking tool 61 is attached to the tip of the wire WR1 of the wires hanging down from the tip of the arm of the crane vehicle, and a hydraulic jack 65 is attached to the tip of another wire WR2 via a chain 66. By gradually lowering these wires WR1 and WR2, the tip of the rock breaking tool 61 is inserted into the drilling hole 8 by a length corresponding to the depth H. In this embodiment, as shown in FIG. 3, a hook for attaching the wire WR1 is attached to the rear end (-Z direction end) of the blade members 63 and 64 and a storage case 67 for holding the tip of the wedge inserted between them. In addition, a hook for attaching the chain 66 is attached to the rear end of the hydraulic jack 65. Furthermore, another hook is further attached to the tip of the hydraulic jack 65, and by operating the wire (not shown) attached to the hook, it is possible to move the rock breaking tool 61 and the hydraulic jack 65 together in the horizontal direction.

[0035] After the above insertion, when oil is supplied from the crane to the hydraulic jack 65, the wedge member 62 moves toward the tip side of the blade members 63, 64 together with the piston rod while sliding against the inclined surfaces 631, 641 of the blade members 63, 64, and the blade members 63, 64 move away from each other in the horizontal direction, exerting a pressing force on the inner wall of the drilled hole 8. At this time, on the (-X) direction side, that is, the side opposite the water's edge, the first abutment surface 632 abuts against the inner wall surface of the drilled hole 8 in a planar manner, so that the pressing force acts in a widely dispersed manner. On the other hand, on the (+X) direction side, that is, the water's edge side, the linear abutment portions 647-649 abut against the inner wall surface of the drilled hole 8 in a linear manner, so that the pressing force acts in a concentrated manner. Therefore, no cracks occur on the (-X) direction side, and cracks occur exclusively on the (+X) direction side. Moreover, the contact point on the (+X) direction side extends in the hole drilling direction Z over a depth H, and cracks are generated over the depth H. In particular, in the planned fracturing area 2b1, the wall surface facing the river 1 functions as the free surface, and in the planned fracturing areas 2b2, ..., the wall surface facing the water's edge area 1a functions as the free surface, so that cracks are introduced from the hole drilling 8 toward the water's edge over a depth H, and the planned fracturing areas 2b1, 2b2, ... are fractured by a single rock breaking process.

[0036] As described above, the linear contact portions 647-649 are extended in the hole-making direction Z on the blade member 64 to concentrate the pressing force over the depth H. As a result, it is possible to perform rock breaking over a range deeper than the height of a person HM in one rock breaking process, for example, a depth of 3.5 m or more in this embodiment.

[0037] Incidentally, the depth H of the pit 3 often exceeds the height of a human being, and it is unavoidable to lengthen the rock breaking tool 61 accordingly. In particular, in order to deal with flooding of the river 1, it is necessary to provide the pit 3 with a depth H of, for example, about 3.5 m. Therefore, in this embodiment, the lubricant is supplied to the rock breaking device 6 configured as described above as follows.

[0038] Fig. 6 is a schematic diagram showing the opposing relationship of grooves provided in the blade member and the wedge member constituting the rock breaking tool shown in Fig. 3. Fig. 7 is a schematic diagram showing the supplying process of lubricant performed before the rock breaking process is performed by the rock breaking device shown in Fig. 3. Fig. 8 is a diagram showing the surface condition of the wedge member after the supplying of lubricant.

[0039] In order to reduce friction and wear when the wedge member 62 slides against the inclined surfaces 631 and 641 of the blade members 63 and 64, the rock breaking tool 61 has grooves 623 in parallel with the drilling direction on the wedge side inclined surfaces 621 and 622 as shown in FIG. 6 in order to effectively supply lubricant between the sliding surfaces (= the wedge side inclined surfaces 621 and 622 and the blade side inclined surfaces 631 and 641). In addition, grooves 633 and 643 are also provided on the blade members 63 and 64 in correspondence with the grooves 623. The grooves 633 and 643 are connected to lubricant guide holes 634 and 644 that penetrate the blade members 63 and 64, respectively. Grease nipples 635 and 645 are inserted into the lubricant guide holes 634 and 644. Therefore, when the grease nipples 635, 645 are pressed into the lubricant guide holes 634, 644 from the outside of the blade members 63, 64, the lubricant is supplied between the grooves 623 and the grooves 633, 643. The wedge members 62 and the blade members 63, 64 are extended in the hole-making direction Z, and their length is much longer than that of conventional rock-breaking tools. Therefore, in this embodiment, by operating the wires WR1, WR2 before the rock-breaking process, the rock-breaking tool 61 and the hydraulic jack 65 are integrally placed on the ground in a horizontal position with the first contact surface 632, which corresponds to the "planar contact portion" of the present invention, facing downward, as shown in Figure 7.

[0040] The lubricant supply unit 10 arranged near the rock breaking tool 61 and the hydraulic jack 65 in the horizontal position is connected to the grease nipples 635 and 645 by the pipe 11A. The lubricant supply unit 10 includes a pail pipe for storing the lubricant and a pump. For example, the pump may be SKR110A50PAL (grease lubricator for pails) manufactured by Yamada Corporation. By operating the pump, the lubricant in the pail pipe is pumped through the pipe 11A to the grease nipples 635 and 645 and supplied to the rock breaking tool 61. In particular, in this embodiment, as shown in FIG. 6, the groove portion 623 is divided into a number corresponding to the lubricant guide holes 634 in the hole drilling direction Z. That is, a plurality of dam members 624 are provided in the groove portion 623 while being spaced apart from each other in the hole drilling direction Z, and the lubricant stays in the corresponding groove portion 623 for each lubricant guide hole 634. Further, a plurality of dam members 636 are provided in groove portion 633 while being spaced apart from one another in the hole drilling direction, and the lubricant for each lubricant guide hole 634 stays in the corresponding groove portion 633. Further, a plurality of dam members 646 are provided in groove portion 643 while being spaced apart from one another in the hole drilling direction, and the lubricant for each lubricant guide hole 644 stays in the corresponding groove portion 643. As a result, the lubricant acts uniformly over a long period of time throughout the entire hole drilling direction Z.

[0041] In this embodiment, the lubricant supply unit 10 is equipped with a hand head 10A that not only supplies the lubricant to the sliding surface through the groove, but also allows the operator to directly supply the lubricant to the sliding surface. As shown in the partially enlarged view of FIG. 7, the hand head 10A has a flat shape similar to a connector connected to a serial port of a computer, and its side end surface is finished in a wide shape in the horizontal direction, while the other part is finished in a shape suitable for being held by an operator. A plurality of discharge ports 10A1 are arranged in the width direction on the wide side end surface. On the other hand, the other part is connected to a pump by a pipe 11B of a system separate from the above-mentioned pipe 11A. Then, when the lubricant is pumped from the pump through the pipe 11B, the lubricant is discharged from each discharge port 10A1. Therefore, by the operator scanning the hand head 10A along the sliding surface while pointing each discharge port 10A1 toward the sliding surface, the lubricant is supplied uniformly over the entire sliding surface such as the wedge side inclined surfaces 621, 622 and the blade side inclined surfaces 631, 641 as shown in Fig. 8. This makes the supply of the lubricant more reliable and improves the efficiency of the lubricant supplying operation.

[0042] In addition, since the tip of the wedge member 62 needs to be inserted with a certain degree of accuracy into the tapered space between the inclined surfaces 631 and 641, the blade members 63 and 64 may be connected to each other by a connecting mechanism (Patent No. 6387505) invented by the applicant of the present application. However, in the conventional connecting mechanism, the blade members 63 and 64 are connected by a bolt member, so that when the blade members 63 and 64 are twisted, it is difficult to return them to their original state. Therefore, as shown in FIG. 9, the two blade members 63 and 64 are connected by a connecting mechanism 13 in a state in which the inclined surfaces are arranged to face each other. Here, the connecting mechanism 13 shown in FIG. 9 is significantly different from the conventional technology (Patent No. 6387505) in that a wire bolt 134W is used instead of a bolt. Since the other configurations are the same, the same reference numerals are used and the configuration description is omitted.

[0043] By using the wire bolt 134W, the twisted relationship of the blade members 63, 64 can be easily corrected, and the crushing and backfilling process can be carried out efficiently.

[0044] The present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the rock is broken all around the borehole 8 over a distance of 3.5 m in the borehole formation direction Z, but this dimension is not limited to 3.5 m, and is effective for a distance of 2 m or more, which is greater than the height of a human HM.

[0045] In the above embodiment, the hydraulic jack 65 is used as a drive source for moving the wedge member 62 in the hole drilling direction Z, but other drive sources, such as a hydraulic breaker, may also be used.

[0046] In addition, in the above embodiment, three linear abutment regions 647 to 649 are provided, but the number of linear abutment regions 647 and the arrangement thereof are arbitrary. For example, only linear abutment region 647 may be provided, or only linear abutment regions 648 and 649 may be provided.

[0047] In the above embodiment, the lubricant is supplied in a horizontal position with the first contact surface 632 facing downward as shown in Fig. 7, but the horizontal position is not limited to this. For example, the lubricant may be supplied in a horizontal position with the first contact surface 632 facing upward.

[0048] In the above embodiment, construction machines that run on caterpillar tracks and those that run on tires are used in combination, but they can be selected appropriately depending on the conditions at the site.

[0049] In the above embodiment, a structure is adopted in which the groove for guiding the lubricant is divided into multiple grooves by providing multiple dam members for the groove, but the number and arrangement of these are arbitrary. In addition, the lubricant is injected using grease nipples 635, 645 and a lubricant supply unit 10. These configurations are applicable to all rock breaking devices that break rocks by sliding blade members and wedge members relative to each other, including those described in Patent Documents 2, 3, and 7. [Industrial Applicability]

[0050] The present invention can be applied to a rock-breaking device that breaks up materials to be crushed, such as bedrock, boulders, and concrete structures, by generating cracks around holes formed in the materials to be crushed, and to a method of supplying lubricant to the rock-breaking device. [Explanation of symbols]

[0051] 2...Rock (crushed material) 6…Rock splitting device 8…Drilling 61…Splitting rock tool 62...Wedge member 63...First blade member 64...Second blade member 632...First contact surface (planar contact part) 647~649…Linear contact area VP…Virtual Plane Y...Array direction Z…Drilling direction

Claims

1. A rock breaking device in which a wedge tip of a wedge member having a tapered shape and a first blade member and a second blade member arranged opposite each other across the wedge tip are inserted into a hole formed in a hole forming direction in a material to be crushed, and the first blade member and the second blade member move radially outward from each other as the wedge member is inserted into the hole along the hole forming direction, thereby breaking up rock around the hole, The first blade member has a planar contact portion capable of contacting an inner wall surface of the hole in a planar manner over a length of at least 2 m or more in the hole forming direction, The second blade member has a linear abutment portion that can linearly abut against the inner wall surface of the hole in parallel to the hole forming direction over at least 2 m or more in the hole forming direction on the opposite side of the planar abutment portion across the wedge tip portion, The radially outward movement of the first blade member and the second blade member creates a crack around the hole located on the opposite side of the planar contact portion across the wedge tip from the area where the linear contact portion contacts the inner wall surface of the hole. A rock breaking device characterized by:

2. The rock breaking device according to claim 1, The second blade member has a plurality of the linear contact portions, A rock breaking device, wherein the total area of ​​the plurality of linear abutment portions in contact with the inner wall surface of the drilled hole is narrower than the area of ​​the planar abutment portions in contact with the inner wall surface of the drilled hole.

3. The rock breaking device according to claim 2, A rock breaking device in which the multiple linear abutment sites are arranged symmetrically with respect to a virtual plane parallel to the arrangement direction in which the first blade member, the wedge tip portion and the second blade member are arranged within the drilling hole.

4. A lubricant supplying method for supplying a lubricant to the rock breaking device according to any one of claims 1 to 3, Before inserting the first blade member, the second blade member, and the wedge tip portion into the drilled hole, the lubricant is injected between the wedge tip portion and the first blade member and between the wedge tip portion and the second blade member while maintaining the horizontal position with the planar contact portion facing downward or upward. A method for supplying lubricant to a rock breaking device.

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