JP4174155B2 - Dynamic compaction device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a dynamic compaction device for compacting the ground, reducing the volume of solid waste (volume reduction), and compressing other solid materials in civil engineering, architecture, waste disposal, and other technical fields.
[0002]
[Prior art]
  The dynamic consolidation method, which is widely used in the fields of civil engineering and architecture, is a technique in which a hammer lifted high above the ground is freely dropped toward the ground and the ground is compacted using the collision energy at that time. This is also said to be tamping because the ground is solidified. Tamping is also used to reduce the volume of solid waste at a waste disposal site or to compress other solids.
[0003]
  The dynamic consolidation method is roughly classified into a hammer connecting type and a hammer detaching type. In the case of the hammer connection type, after winding the hammer connected to the tip of the wire rope with a winch, the winch is freed without separating the hammer from the wire rope, and the wire rope is unwound to drop the hammer onto the ground. In the case of the hammer detachable type, the hammer is held by a detacher connected to the tip of the wire rope, wound up with a winch, then separated from the detacher and dropped onto the ground. In either method, the lifting step for lifting the hammer and the dropping step for dropping the hammer are repeated as many times as necessary. With regard to these, a hammer connection type is disclosed in Japanese Patent Publication No. 58-2290, and a hammer detachment type is disclosed in Japanese Utility Model Publication No. 7-8578.
[0004]
  For hammer-coupled dynamic consolidation methods, see below.(1) ~ (Five)There is an indication like this.(1) In the case where the winch is braked when the hammer collides with the ground during the dropping step, the wire rope is unslid and the winch drum is idle due to the rotational inertial force of the winch drum, the falling inertial force of the wire rope, and the falling inertial force of the hammer. Occurs. Moreover, due to these reasons, the wire rope may be wound around the winch drum or the wire rope itself may be twisted, so that the work cannot be performed.(2) When avoiding such a situation, the winch must be braked before the hammer hits the ground, but this operation is generally difficult and requires skill.(3) Even if the winch braking before landing on the hammer can be performed in a timely manner, the falling energy of the hammer is attenuated by the winch braking before the ground collision, so that the energy cannot be fully utilized, and the ground compacting work efficiency is reduced. To do.(Four) Since the drop in the hammer fall speed induces a reduction in the compaction capacity, it is not possible to take a decelerating measure with a moving pulley when locating the wire rope for the hammer. [Rope pulling force by the crane body] = [crane's ability to lift the hammer] also limits the weight of the hammer.(Five) During the period from winch braking to hammer landing, the rotational inertia force of the winch drum, the drop inertia force of the wire rope, the drop inertia force of the hammer, etc. act on the parts of the device as impact loads. It tends to happen. Especially for winch brake systems, the wear is not so great.
[0005]
  The hammer detachable dynamic compaction method for this is to separate the hammer lifted high above the ground from the detacher and drop it.(1) ~ (Five)Such a situation does not occur. In particular, since the weight limit of the hammer is relaxed, it is possible to apply a hammer that satisfies the load condition according to the lifting capacity of the crane. Nonetheless, the hammer detachable dynamic compaction method requires a crane equipped with a detacher to detach and lift the hammer. For the crane body equipped with a desorption machine, a hammer automatic desorption system that can satisfy these requirements, such as safe lifting of heavy objects (hammer) and safe work at high altitudes, must be established. The technique disclosed in the aforementioned Japanese Utility Model Publication No. 7-8578 is one embodiment of this. The prior art will be briefly described below with reference to FIGS.
[0006]
  A crawler crane 1 shown in FIGS. 11 to 13 includes a crane boom 2 that can be raised and lowered, a stay boom 3 that is flexibly connected to an upper end of the boom 2, and a lower portion of the crane boom 2 and the stay boom 3. And a connecting member 4 that is connected to each other. In this case, the crane boom 2, the stay boom 3 and the connecting member 4 have a triangular frame structure (hereinafter referred to as a triangular structure). The crawler crane 1 also includes a plurality of winches (not shown). Of the wire ropes 5 and 6 unwound from each winch, one wire rope 5 is connected to the crane boom 2 in order to operate the crane boom 2, and the other wire rope 6 is connected to the crane boom 2. It is suspended via the top of the. A pulley 7 with a hook is provided at the lower end of the wire rope 6, and a detaching machine 9 for holding and releasing the hammer 8 is suspended and supported by the hook of the pulley 7.
[0007]
  For dynamic consolidation methodInDeploying protective nets has also been implemented. This is a measure against earth and sand scattered by impact when the hammer 8 falls and collides with the ground. In order to prevent such earth and sand from harming the surroundings, the hammer falling point is surrounded by a protective net. Is. Although the protective net is not shown in FIGS. 11 to 13, this usually uses the connecting member 4 to stand up and stick to the column.
[0008]
[Problems to be solved by the invention]
  As for the ground to be improved, even if this is flat terrain, steps and irregularities are inevitably produced in the repeated process of compacting and leveling. For example, when tamping and compacting a wide site every fixed section, there is a step between the subsidence section that has been compacted and the section that has not been constructed or is not frequently applied. On the other hand, in the same section, since the crater (recessed hole) is generated by tamping, the ground becomes uneven. Under such circumstances, when the dynamic consolidation method is carried out by the above-mentioned technical means, the following inconveniences described with reference to the tamping construction examples of FIGS. 11 to 13 occur.
[0009]
  The tamping construction of FIG. 11 shows an example when compacting a section (ground G) of a wide site. At this time, the crawler crane 1 is operated as follows. First, the crawler crane 1 is moved to a predetermined tamping point. Next, the hammer 8 is held by the detaching machine 9 in the lowered state, the wire rope 6 is wound up, and the hammer 8 is lifted to a predetermined height. Thereafter, the hammer 8 is separated from the detaching machine 9 and dropped onto the ground G. Thus, when a predetermined tamping point is compacted, a crater (recessed hole) is generated there. In the case of FIG. 11, in order to compact each tamping point on the ground G, after the craters C1 and C2 are formed by the above-described operation, the crater C3 is further formed. At this time, every time one crater is formed, the crawler crane 1 must be shifted at a predetermined pitch. However, when the crawler crane 1 is moved to a predetermined position so as to form the crater C3, the lower end surface of the stay boom 3 partially overlaps with the crater C2, so that the triangular structure does not stably stand on the ground G. When such an instability factor is involved, it is impossible to ensure safety in performing the work.
[0010]
  In the tamping construction of FIG. 12, the crater C is to be formed on the low ground G2 side near the step boundary in the relative high ground G1 and low ground G2, that is, the ground G having a step. In this case, since the crawler crane 1 is on the lowland G2 side and the lower end surface of the stay boom 3 rides on the highland G1, the triangular structure described above tilts backward toward the crawler crane 1 side. When the hammer 8 is lifted in such a rearward tilted posture, the hammer 8 receives the interference of the crane boom 2 and comes into contact with the hammer 8 during the lifting. Therefore, in the case of FIG. 12, since the hammer 8 cannot be lifted to a predetermined height, the falling energy of the hammer 8 cannot be effectively maximized.
[0011]
  The tamping construction of FIG. 13 is going to form a crater C on the highland G1 side near the step boundary, contrary to the above. In this case, since the crawler crane 1 is on the highland G1 side and the lower end surface of the stay boom 3 has fallen into the lowland G2, the triangular structure tilts forward with respect to the crawler crane 1. Even when the hammer 8 is lifted in such a forward tilted posture, the hammer 8 is subjected to interference from the stay boom 3 during the lifting process. Therefore, even in the case of FIG. 13, the hammer 8 cannot be lifted to a predetermined height, and suffers the same disadvantages as described above.
[0012]
  A further problem is handling of the crawler crane 1 when work is temporarily suspended. For example, when a typhoon or gust wind is predicted and the work is suspended, if the lifting mechanism with a height of several tens to several tens of meters is left as it is, the crawler crane 1 may fall due to the strong wind. . Therefore, measures must be taken to lower the center of gravity and avoid the effects of strong winds. In such a case, the crane boom 2 and the stay boom 3 may both extend straight and lie down on the ground. However, the crane boom 2 or the stay boom 3 is connected to the triangular structure by the connecting member 4. In such a case, it takes a troublesome work to disassemble these parts, and the work is similarly required for the assembly when resuming the work.
[0013]
  One issue other than the above is due to the protection net. It is not bad to surround the hammer drop point with a protective net, but the protective net is not good for boom operation such as when changing the tamping point. In addition, the size of the protective net must be changed each time the hammer drop point is surrounded widely or narrowly.
[0014]
OBJECT OF THE INVENTION
  The present invention has been made to solve the technical problems described above. Therefore, the present invention can perform stable tamping work without being affected by the ground such as steps and unevenness, can utilize the falling energy of the hammer sufficiently effectively, can easily take safety measures when not in use, It is an object of the present invention to provide a dynamic compaction device that can satisfy the requirements such as good operation followability of the protective means and rational adjustment and change of the protective range.
[0015]
[Means for Solving the Problems]
  Of the present inventionClaim 1The dynamic compaction device according to the present invention is characterized by the following problem solving means in order to achieve the intended purpose. That is, the dynamic compaction device according to claim 2 includes a crane main body equipped with a winch for main winding and a winch for supplementary winding, a crane boom and a stay boom, a sheave holder having a guide sheave, and a detachment for a hammer and a hammer. And a protective body composed of a pair of vertically long curved fences, and the crane boom is assembled to the crane body so that it can be raised and lowered, and the upper end of the stay boom is bent and extended with the upper end of the crane boom. It is connected freely, the sheave holder is assembled in the vicinity of the connecting part of both booms, and the main winding wire that is unwound from the main winding winch and passes through the upper end side of the crane boom The rope is hanging between the booms, and the detacher is suspended from the hanging part of the main wire rope, Is detachably held by the detaching machine, and the auxiliary winding wire rope unwound from the auxiliary winding winch and passed through the sheave of the sheave holding body is connected to the lower end side of the stay boom, And one curved fence and the other curved fence in a protection body are each united cylindrically so that it may be respectively hold | maintained on each inner surface of a crane boom or a stay boom, and a diameter may be expanded and contracted.
[0016]
  Of the present inventionClaim 2The dynamic compaction device according toClaim 1The sheave holding body assembled to the connecting portion between the crane boom and the tabe boom is an inverted triangle, and the sheaves are respectively attached to the front corner portion and the rear corner portion of the holding body. It is characterized by.
[0017]
[Action]
  In the dynamic compaction device according to the present invention, the hammer held by the detacher is lifted high above the ground by a crane operation, and this is separated from the detacher and caused to fall and collide with the ground. Received and compacted. Such tamping work is no different from the existing ones. However, the crane boom and the stay boom are independent from each other, including the winch for operating them and the rope arrangement, and there are no members connecting them. That is, since the crane boom and the stay boom have operational independence, the opening angle of both booms can be arbitrarily adjusted. When there is such a degree of freedom of operation, it is possible to avoid the crater and stabilize the stay boom on the ground, thereby ensuring work safety. Further, when the hammer is lifted, the boom inclination angle can be adjusted so that it does not come into contact with the crane boom or the stay boom. Therefore, even when both booms straddle the level difference of the ground, the hammer can be lifted up to a predetermined height, thereby sufficiently securing the falling energy of the hammer. In order to prevent the crane from falling over, both booms can be stretched straight and laid down on the ground. This can be done only by operating the crane (winch operation) without disassembling the lifting mechanism. The speed of resuming will be accelerated. On the other hand, the protective body is composed of a pair of curved fences, and these curved fences are attached to the inner surfaces of both booms. Since both curved fences are held by the crane boom and the stay boom, the operation followability to these is good. Moreover, both curved fences are combined in a cylindrical shape, and the diameter (size) can be expanded or contracted by adjusting the degree of overlap, so it is easy to enclose the hammer falling point widely or narrowly It can be done.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
  An embodiment of a dynamic compaction device according to the present invention will be described below with reference to the accompanying drawings.
[0019]
  1 to 3 show an embodiment of a dynamic compaction apparatus according to the present invention. In these drawings, 11 is a crawler type crane main body, 16 is a crane boom, 17 is a stay boom, 19 is a sheave holder, 31 is a detaching machine for a hammer, and 41 is a hammer.
[0020]
  The crawler type crane main body 11 illustrated in FIGS. 1 and 2 is well known. The crane body 11 is equipped with or is equipped with a main winding winch 12, an auxiliary winding winch 14, and the like. The main winding winch 12 is for winding and unwinding the main winding wire rope 13, and the auxiliary winding winch 14 is for winding and unwinding the auxiliary winding wire rope 15.
[0021]
  The crane boom 16 and the stay boom 17 in FIGS. 1 and 2 are made of a high-strength metal material. The crane boom 16 is assembled to the front end portion of the crane body 11 so as to be freely raised and raised by a known means. The tip (upper end) of the crane boom 16 has a bifurcated shape as shown in FIG. 2 in order to receive the tip (upper end) of the stay boom 17. The stay boom 17 has a reaction force plate 18 at the lower end. The stay boom 17 is connected to the upper end portion of the crane boom 16 via a support shaft 27 so as to be able to bend and extend. As an example, the sheave holding body 19 is formed of an inverted triangle framed by a plurality of metal frame members, and guide sheaves 20 and 21 that are rotatably supported by a support shaft are provided at the front and rear corners of the holding body 19. In the department. The shape of the sheave holder 19 is not limited. Accordingly, the sheave holder 19 can have an arbitrary shape such as a circle, a quadrilateral or more polygon, or an irregular shape. The sheave holder 19 is assembled in the vicinity of the connecting portion between the booms 16 and 17. The assembly portion of the sheave holder 19 may be the upper end portion of the crane boom 16 or the upper end portion of the stay boom 17. In the illustrated example, the connecting portion 18 is connected via a connecting support shaft 18 for both booms 16 and 17. A sheave holder 19 is assembled there. In other respects, a guy line 22 is stretched over the crane boom 16 and the crane body 11, and a guy line 23 is stretched over the crane boom 16 and the sheave holder 19.
[0022]
  The rope-out configuration of the main wire rope 13 and the auxiliary wire rope 15 is as follows with reference to FIGS. After being unwound from the main winding winch 12, the main winding wire rope 13 hangs down and U-turns between the crane boom 16 and the stay boom 17 via the guide sheave 24 on the crane boom upper end side, The tip of the rope is returned to the upper end side of the crane boom 16 and connected to the appropriate position. A sheave block 26 having a hook 25 is suspended from the hanging portion of the main wire rope 13. The auxiliary winding wire rope 15 is unwound from the auxiliary winding winch 14, is then wound around the guide sheaves 20 and 21 of the sheave holding body 19, and is pulled downward, and the tip end of the rope is the lower end of the stay boom 17. It is connected to the side.
[0023]
  The desorber 31 and the hammer 41 are already known from Japanese Utility Model Publication No. 7-8578. These are clearly shown in FIG. Referring to FIG. 3, the detaching machine 31 includes a pair of chuck levers 33 and 34 coupled to each other through a pivot shaft 32 so as to be relatively openable and closable. A hydraulic cylinder type opening / closing operation device 35 is a main component. A key 37 having an inverted triangular pyramid taper shape is attached to the tip of the output shaft 36 of the opening / closing operation device 35, and both side surfaces of the key 37 are in contact with the inner surfaces of both chuck levers 33 and 34. The hydraulic piping 38 of the opening / closing operation device 35 is connected to a hydraulic device on the crane body 11. On the other hand, the hammer 41 is obtained by assembling the body 43 on the weight portion 42. On the upper surface side of the body 43, a holding hole 44 for inserting the tips of both chuck levers 33 and 34 is formed in a tapered shape. ing. The desorber 31 and the hammer 41 may be those disclosed in Japanese Patent Publication No. 58-2290. Alternatively, the hammer 41 may be adsorbed and held by the desorber 31 or separated by using magnetic force. The detaching machine 31 in the illustrated example is suspended and supported by the hook 25 of the sheave block 26, and the hammer 41 in the illustrated example is held or separated by both chuck levers 33 and 34 of the detaching machine 31. Most of those described in this paragraph are made of metal and have high mechanical strength.
[0024]
  When the ground is compacted using the dynamic compaction device illustrated in FIGS. 1 to 3, the crane body 11 is operated as follows. First, the crane body 11 is moved to a tamping point in the ground. At this time, the drooping portion of the main winding wire rope 13 is lowered, and the detaching machine 31 held by the hook 25 of the sheave block 26 is lowered to near the ground surface. Therefore, when the hammer 41 placed at a predetermined point is held by the detacher 31, the chuck levers 33 and 34 are closed and the tip portions thereof are inserted into the holding holes 44 of the hammer 41, Thereafter, both chuck levers 33 and 34 may be opened and their tip portions may be strongly pressed against the inner surface of the holding hole 44. When the hammer 41 is thus held by the detaching machine 31, the main winding wire rope 13 is wound up by the main winding winch 12, and the hammer 41 is lifted to a predetermined height. Then, both chuck levers 33 and 34 of the detaching machine 31 are closed to release the hammer holding force. As a result, the hammer 41 is separated from the desorber 31 and falls naturally. Thus, when the hammer 41 falls and collides with the ground, the ground is compacted by the collision energy at that time, and a crater (recessed hole) is generated there. By the way, in the general example when compacting the ground in a wide site, the site is partitioned into appropriately sized work areas, and the first section of them is tamped and spread as above, After the second section, construction will be repeated to repeat tamping and leveling. The ground compaction described below shows an example of tamping work in such a case.
[0025]
  FIG. 4 shows a situation where the ground G (one section of a wide site) is being tamped, and after two craters C1 and C2 are formed, a crater C3 is further formed. The crane body 11 up to this stage moves at a predetermined pitch every time one crater is formed. Here, it is assumed that the bending angle (the included angle) between the crane boom 16 and the stay boom 17 is fixed. In such a case, if the reaction force plate 18 of the stay boom 17 partially overlaps the crater C2, the stay boom 17 will not be stably stanced as described in FIG. 11, and the crane as a whole will also become unstable. However, for the stay boom 17 that is not restrained by the crane boom 16 in terms of operation and operation, the bending angle with the crane boom 16 can be increased by operating the auxiliary winding winch 14, that is, winding or lowering the auxiliary winding wire rope 15. It can be adjusted freely. As a result, the degree of opening of the stay boom 17 relative to the crane boom 16 is adjusted. Therefore, in the case of FIG. 4, it is only necessary to adjust the stay boom 17 as described above so that the reaction force plate 18 is firmly landed on the flat surface between the craters C1 and C2, thereby ensuring the stability of the entire crane. be able to.
[0026]
  FIG. 5 shows a situation in which a crater C is formed on the low ground G2 side near the step boundary in the relative high ground G1 and low ground G2, that is, a ground G having a step. In the case of such a case, in the conventional example of FIG. 12, since the hammer contacts the crane boom, it cannot be lifted to a predetermined height. In the case of FIG. 5, hammer contact with the crane boom 16 can be avoided by increasing the degree of opening of the stay boom 17 with respect to the crane boom 16 by the winch operation described above. Therefore, even in the ground G with a step boundary as shown in FIG. 5, the hammer 41 can be lifted up to a predetermined height, and its fall energy can be effectively utilized to the maximum.
[0027]
  FIG. 6 shows a situation where the crater C is formed on the highland G1 side near the step boundary, contrary to the above. In the case of such a case, in the conventional example of FIG. 13, since the hammer contacts the stay boom, it cannot be lifted to a predetermined height. Also in the case of FIG. 6, it is possible to avoid hammer contact with the stay boom 16 by increasing the degree of opening of the stay boom 17 with respect to the crane boom 16 by the winch operation. Therefore, even in the ground G with a step boundary as shown in FIG. 6, the hammer 41 can be lifted up to a predetermined height, and the fall energy can be effectively utilized to the maximum.
[0028]
  FIG. 7 shows a state in which the crane boom 16 and the stay boom 17 are stretched in a straight line and hung down along the ground to prevent the crane from overturning. This can be done by a light work such as loosening the auxiliary winding wire rope 15 while the crane boom 16 is tilted horizontally, and there is no need to disassemble a part of the lifting mechanism. Therefore, troublesome work is not required to prevent the crane from falling over, and the work can be resumed quickly.
[0029]
  The sheave holder 19 in the above is an inverted triangle. This functions significantly depending on the inverted triangle, and is advantageous in terms of operation and structure. For example, when the auxiliary winding wire rope 15 is used to pull the lower end side of the stay boom 17, the auxiliary winding wire rope 15 may have a small operating force so as to largely detour around the support shaft 27. The closer to the shaft 27, the greater the operating force is required. In such a case, the inverted triangular sheave holding body 19 sufficiently pulls the power point (guide sheaves 20 and 21) of the auxiliary winding wire rope 15 away from the bending point (support shaft 27) of the stay boom 17, so that the operating force can be reduced. The sheave holder 19 also avoids contact with both the wire ropes 13 and 15 on the upper end side of the both booms 16 and 17, so that these contacts and interference are less likely to occur. In addition, the sheave holder 19 is advantageous in structure because it supports all the load from the auxiliary winding wire rope 15 with a compressive force, and simplifies and reduces the weight of the wire rope-related traction structure.
[0030]
  8 to 10 show another embodiment of the dynamic compaction device according to the present invention. In the illustrated example of the dynamic compaction device, a protective body 51 is added to the dynamic compaction device described with reference to FIGS. Therefore, the protector 51 will be mainly described below, and the description of other components will be omitted by referring to the above-described contents.
[0031]
  With reference to FIGS. 8 to 10, the protection body 51 includes a pair of curved fences 52 and 53. These curved fences 52 and 53 are configured by attaching a net made of metal or synthetic resin to a frame made of metal or synthetic resin (including FRP), for example, each of which is a cylindrical body. It has a curved surface shape in which a part of the peripheral wall is cut out in the vertical direction. Referring to FIG. 9, the curved fences 52 and 53 have a substantially arc shape when viewed from the plane. In these relative relationships, one curved fence 52 is slightly smaller than the other curved fence 53 in terms of radial dimensions. Therefore, the two curved fences 52 and 53 can be combined into a cylindrical shape in a face-to-face manner apparent in FIG. The curved fences 52 and 53 may have a curved shape obtained by vertically dividing a polygonal cylinder having a quadrangle or more.
[0032]
  The two curved fences 52 and 53 described above are held on the inner surfaces of the crane boom 16 and the stay boom 17. 8 and FIG. 10 as means for that, the brackets 54 and 55 such as brackets are attached to the inner surfaces of the booms 16 and 17, and a plurality of suspension ropes 57 and 58 are arranged in a well-balanced manner. It is tied to the upper part of each curved fence 52,53. The curved fences 52 and 53 of the protective body 51 are in a state in which the two curved fences 52 and 53 face each other by hanging each of the suspension cables 57 and the other suspension cable 58 on the respective suspension tools 54 and 55. Is held on the inner surfaces of the booms 16 and 17. The fence holding means described here is only an example. In addition to this, it is also possible to hold the fence using a well-known stay or metal fitting.
[0033]
  When the ground is compacted using the dynamic compaction device illustrated in FIGS. 8 to 10, the crane body 11 is operated in the same manner as described in FIGS. 4 to 7. At this time, the two curved fences 52 and 53 that follow the crane boom 16 and the stay boom 17, that is, the protective body 51, surround the tamping point (the falling point of the hammer 41) on the ground G within a certain range. . Specifically, in the case of FIGS. 8 and 9, the tamping point of the flat ground G is enclosed as such, and in the case of FIG. 10, the tamping point of the ground G having a step is enclosed as such. Since both curved fences 52 and 53 of the protective body 51 increase or decrease the degree of overlap depending on the degree of opening between the booms 16 and 17 and move relative to each other in a vertical direction on a stepped land or the like. There is flexibility in enclosing the tamping point. In the case of surrounding the tamping point in this way, when the hammer 41 falls and collides with the ground G, earth and sand at the tamping point hardly scatters to the outside of the protection body 51, and the safety of the work area is further enhanced. Can do.
[0034]
  The dynamic compaction device of the present invention is not only for compacting the ground in the field of civil engineering and construction, but also when reducing solid waste in waste disposal sites such as landfills with garbage, or when compressing other solids Can also be used in other fields as well when compacting the ground or the like.
[0035]
【The invention's effect】
  The dynamic compaction device according to the present invention has the following effects.
[0036]
  The crane boom and the stay boom are independent from each other, including a winch for operating them and a rope-out configuration, and members for restraining them are not interposed therebetween. Therefore, regarding the stay boom, it is possible to select a ground without unevenness and make it stand stably, and with this stable stand, safety and stability of the tamping work can be ensured.
[0037]
  When the tamping work is performed across the level difference, adjusting the opening degree of the booms does not cause a bias of the hammer toward the crane boom side or the stay boom side. This means that the lifting hammer does not come into contact with the crane boom or the stay boom. Therefore, the hammer can be lifted to a predetermined height even in work other than on flat ground, so that the falling energy of the hammer can be sufficiently secured and the ground can be compacted efficiently.
[0038]
  When taking safety measures to prevent the crane from toppling when not in use, that is, when both booms are extended straight and lie on the ground, operation on the crane without disassembling the lifting mechanism (winch operation) This can be done only by itself, saving unnecessary work. In addition, work can be resumed more quickly.
[0039]
  The protective body is composed of a pair of curved fences that can be freely combined and separated, and these are separated and held on the inner surfaces of the crane boom and the stay boom, and are combined into a cylindrical shape. Since each curved fence (one pair) of this protection body is hold | maintained at each boom, the operation followability with respect to these is favorable. In addition, the two curved fences combined in a cylindrical shape can be expanded and contracted, so it is easy to enclose and narrowly enclose the hammer falling point, and it moves relatively up and down even in step areas. Because it corresponds to this, usability is also improved.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing one embodiment of a device of the present invention.
FIG. 2 is a right side view of the apparatus of FIG.
FIG. 3 is a longitudinal sectional view schematically showing an example of a hammer in the device of the present invention.
FIG. 4 is a front view schematically showing an example of tamping work by the apparatus of the present invention.
FIG. 5 is a front view schematically showing another example of tamping work by the apparatus of the present invention.
FIG. 6 is a front view schematically showing still another example of tamping work by the apparatus of the present invention.
FIG. 7 is a front view schematically showing an example in which safety measures are taken for the device of the present invention (non-use state).
FIG. 8 is a front view schematically showing another embodiment of the device of the present invention together with its usage.
9 is a plan view schematically showing a part of the apparatus shown in FIG.
10 is a front view schematically showing another use mode of the apparatus of FIG. 8. FIG.
FIG. 11 is a front view schematically showing an example of tamping work by a conventional apparatus.
FIG. 12 is a front view schematically showing another example of tamping work by a conventional apparatus.
FIG. 13 is a front view schematically showing still another example of tamping work by a conventional apparatus.
[Explanation of symbols]
  11 Crane body
  12 Winch for main winding
  13 Main winding wire rope
  14 Additional winch
  15 Supplementary wire rope
  16 Crane boom
  17 Stay boom
  19 Sheave holder
  20 Information sieve
  21 Information sieve
  25 hook
  26 Sieve Block
  27 Spindle
  31 Desorption machine
  41 Hammer
    G ground

Claims (2)

  Crane body equipped with a main winding winch and a supplementary winding winch, crane boom and stay boom, sheave holder with guide sheave, hammer and hammer detacher, and a pair of vertically long curved fences The crane boom is assembled to the crane body so that the crane boom can be raised and lowered, and the upper end of the stay boom is connected to the upper end of the crane boom so as to be able to bend and extend. A sheave holder is assembled in the vicinity of the connecting portion, and a main winding wire rope unwound from the main winding winch and passing through the upper end side of the crane boom hangs down between both booms, and The detaching machine is suspended from the hanging part of the main wire rope, and the hammer is detachably held by the detaching machine, And the auxiliary winding wire rope unwound from the auxiliary winding winch and passing through the sheave of the sheave holding body is connected to the lower end side of the stay boom, and one curved fence and the other curved surface of the protective body A dynamic compaction device characterized in that a fence and a boom are held in respective inner surfaces of a crane boom and a stay boom, and are combined in a cylindrical shape so that the diameter can be expanded and contracted. The dynamic compaction according to claim 1 , wherein the sheave holding body assembled to the connecting portion between the crane boom and the tabe boom is an inverted triangle, and guide sheaves are respectively attached to the front corner portion and the rear corner portion of the holding body. apparatus.

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