JP6472319B2 - Ground improvement construction machine - Google Patents

Description

  The present invention includes a carrying bucket that is moved up and down along a leader, and a hollow pipe (also referred to as a casing pipe) that has a hopper that receives an improvement material in the bucket and is inserted into or extracted from the ground. In particular, the bucket or hopper has an inclined surface on the upper inlet and lower outlet, and the side wall that divides the interior, and the improved material introduced from the inlet is discharged from the inclined surface. It relates to a structure that slides and moves.

  The target ground improvement construction machine is used for the static compaction sand pile construction method (SAVE-CP) and the sand compaction pile (SCP) construction method as exemplified in Fig. 1, and is a leader standing as a material supply structure. A transport bucket that is raised and lowered along the sand, and a hollow tube that has a hopper at the top for introducing an improved material such as sand contained in the bucket and that can be raised and lowered along the leader and penetrated or pulled out into the ground It has. In addition, the bucket and the hopper are formed such that the upper inlet is formed larger than the lower outlet to facilitate the introduction of the improved material, and the side wall that defines the interior has an inclined surface, and the inner side from the inlet. The introduced improved material slides from the inclined surface to the discharge port.

  By the way, in the SAVE-CP, the SCP method, etc., good quality sand or granular materials as an improved material, that is, a filling material, gradually decrease and tend to be expensive. Therefore, materials that are difficult to handle as improving materials, for example, materials with a high water content, locally generated soil, viscous soil, and the like may be used. However, when the material that is difficult to handle is thrown into the hopper from the bucket, and when moving from the hopper into the hollow tube, among the side walls that define the bucket and the hopper, it is particularly easy to adhere to inclined surfaces other than the vertical surface, Deterioration of work efficiency, and the inside of the bucket and hopper may be blocked, making it difficult to work.

  As measures for the above, low friction materials are coated on the inner side of the bucket or hopper, or a vibrator is attached to the outer wall of the hopper. It was not enough as an adaptation measure for difficult materials. Further, in the structure in which the vibrator is attached to the outer wall surface of the hopper, when the vibrator is operated, the whole shakes and becomes a cause of failure of monitoring devices and measurement sensors provided around the hopper.

  FIG. 7 shows a hopper (introduction device) disclosed in Patent Document 1 developed from the above background. The hopper 13 has a movable plate 21 and a movable plate driving cylinder 24 as a driving means thereof. The movable plate 21 is composed of at least a pair of pivot plates opposed to each other in the hopper, and the pair of movable plates are moved in synchronization by the connecting rod 23. The cylinder 24 has a rod 25 that is projected and retracted, and is retracted with the rod 25 connected to the movable plate 21 or the connecting rod 23. In this structure, as shown in FIG. 5B, the pair of movable plates 21 are moved by the cylinder 24 in the hopper, so that it is difficult for an improvement material such as sand to adhere to the hopper, and the pair of movable plates 21. Since they are connected to each other by the connecting rod 23, they can move in different directions and efficiently introduce the improving material into the hollow tube without narrowing the introduction path (discharge port) of the improving material in the hopper. Can do.

Japanese Patent No. 3480914

  However, in the above-described structure, the pair of movable plates are intermittently moved by the cylinder, so that the effect of preventing the adhesion of the improved material cannot be sufficiently exhibited, or the movable plate is pivotally supported on the inclined plate as in (b). Because the length is restricted and it cannot be extended to the vicinity of the hopper discharge port, the improvement material is likely to be clogged near the discharge port, and when the improvement material is put up like the right movable plate, the improvement material is placed between the movable plate and the inclined plate. May enter and the movable plate may not be able to move normally.

  In view of the above, the object of the present invention is to reliably eliminate the possibility of adhesion even when a material that is difficult to handle as an improved material is used in a bucket or hopper, thereby maintaining good working efficiency. Do not adversely affect the monitoring equipment installed in the vicinity. Other purposes will be clarified in the following description.

The present invention according to claim 1, when specified with reference to FIG. 6, includes a transport bucket 3 that is lifted and lowered along a standing leader 2, and a hopper 4 for introducing an improvement material accommodated in the transport bucket. And a hollow tube 5 that can be moved up and down along the leader and penetrated or pulled out into the ground, and the carrying bucket and hopper together with an upper inlet and a lower outlet A ground improvement construction machine that has inclined surfaces 31 and 41 on the side walls 30 and 40, and moves the improved material thrown into the interior to the discharge ports 3b and 4b from the inclined surface . The bucket 3 and / or the hopper 4 has a diaphragm 7 that is arranged so as to cover the inclined surface or a part of the inclined surface, and is supported so as to be swingable and displaceable via a plurality of elastic bodies 6. It is characterized by being.

  In addition to the embodiments, the hollow tube of the present invention has a single hopper at the top and a connecting branch pipe provided at the bottom, and a hollow tube is provided below each branch pipe of the connecting branch pipe. Are also included (see, for example, Japanese Patent No. 4137744).

The present invention as described above is more preferably embodied as in claims 2 to 5.
(A) The diaphragm 7 has a vibrator 8 attached to the back surface, and is configured to be swung by vibration of the vibrator (claim 2).
(A) The hollow tube 5 has a vibratory hammer 9 at the top as illustrated in FIG. 6, and the diaphragm 7 is configured to be swung by vibration of the vibratory hammer (claim 3).
(C) The diaphragm 7 has a lower end extending to the discharge ports 3b and 4b.

(D) The hopper 4 has an air injection means 46 for injecting air toward the discharge port 4b (Claim 5).
(E) The side walls 30 and 40 have a plurality of the inclined surfaces 31 and 41, and the diaphragm 7 is supported independently of the inclined surfaces via the elastic body 6, respectively. In this configuration, a gap 49 between adjacent diaphragms 7 is sealed so as to be swingably displaceable (Claim 6).

  According to the first aspect of the present invention, the bucket and the hopper are arranged so as to cover an inclined surface excluding the vertical surface and a part of the inclined surface among the side walls defining the interior, and are supported so as to be swingable and displaceable via the elastic body. Has a diaphragm. This diaphragm is irregularly oscillated in multiple directions with respect to the inclined surface via an elastic body. As a result, for example, irregular oscillation when an improved material put into the diaphragm is received on the diaphragm. Thus, it is possible to effectively suppress the improvement material from adhering.

  In the invention of claim 2, since the vibration plate is irregularly swung in multiple directions by the vibration of the vibrator attached to the back surface, the improvement material adheres compared to the structure in which the vibrator is attached to the outer wall of the bucket or hopper. Can be prevented more reliably and efficiently. In addition, the material supply management configuration is such that a monitor attached to a bucket or hopper is used to check the passage of the introduced improved material from the driver's seat, etc., and the vibrator is operated to apply vibration when adhesion occurs or is blocked. It is also possible. Furthermore, vibrations applied to the bucket and hopper itself can be suppressed by attaching the vibrator to the diaphragm. As a result, vibration applied to monitoring equipment such as monitors and measurement sensors provided around the bucket and hopper is reduced and vibrations are reduced. It is possible to drastically reduce the occurrence of failure.

  In the invention of claim 3, the hollow tube has a vibratory hammer, and the vibration of the vibratory hammer, particularly the vibration in the vertical direction, is transmitted / resonated to the diaphragm via the elastic body. As a result, the vibration of the vibratory hammer is transferred to the bucket or hopper. It can be effectively used to prevent adhesion of improved materials to

  In the fourth aspect of the invention, compared to the movable plate configuration of Patent Document 1, the lower end of the diaphragm extends to the outlet of the bucket or hopper, so that the improvement material is not easily clogged or blocked near the outlet.

  In the invention of claim 5, since the hopper has an air injection means for injecting air toward the discharge port, the clogging can be prevented by injecting air when the improved material is clogged near the discharge port. This can be surely prevented, whereby the improvement material can be introduced into the hollow tube stably and efficiently.

  In the invention of claim 6, since the gap between the diaphragms is sealed with a swingable cover, the improvement material enters the diaphragm back side through the gap between the diaphragms, and the elastic body or diaphragm The possibility of impairing the operation can be eliminated, whereby the operating characteristics can be maintained well together with the appearance.

It is a mimetic diagram showing the whole ground improvement construction machine of the 1st form of the present invention. (A) is the enlarged partial side view seen from the A direction of FIG. 1, (b) is the enlarged partial top view which looked at the hopper of FIG. 1 from the B direction. (A) And (b) is the AA expanded sectional view of FIG.2 (b), and the BB expanded sectional view. FIG. 2 is a schematic view showing the bucket of FIG. 1, (a) closing the bucket outlet, (b) opening the bucket outlet, with the holding frame attached, and with the holding frame removed. It is an expanded sectional view which shows the principal part of the said bucket. It is a schematic diagram which shows the 2nd form of this invention. It is explanatory drawing which shows FIG.1 and FIG.2 (c) of patent document 1. FIG.

  Embodiments to which the present invention is applied will be described below with reference to the drawings. In this description, the entire structure of the ground improvement construction machine according to the first embodiment, the bucket and the hopper which are the main parts and the operation thereof, and the changes of the ground improvement construction machine according to the second embodiment will be described in detail. In the drawing, details are omitted or simplified due to restrictions in drawing.

(First Embodiment) In FIGS. 1 and 2, this ground improvement construction machine is similar to Patent Document 1 in that a forced force such as a rack and pinion provided between the leader 2 as a means for penetrating and extracting the hollow tube 5 is used. This is an example suitable for raising and lowering the hollow tube 5 by the raising and lowering mechanism, that is, no vibration or static compaction. However, the target ground improvement construction machine may be a type in which the hollow tube 5 is penetrated by the vibro hammer 9 as shown in the second embodiment.

  The ground improvement construction machine is housed in a self-propelled base machine 1, a leader 2 erected on the front support portion of the base machine 1, a transport bucket 3 that is raised and lowered along the leader 2, and a bucket 3. It has a hopper 4 into which an improved material such as sand is placed, and a hollow tube 5 that is lifted and lowered by a lifting device 29 along the leader 2 and penetrated into or pulled out from the ground. The bucket 3 and the hopper 4 are formed in a container shape, and have inclined surfaces 31 and 41 on the side walls 30 and 40 that define the inside together with the upper inlets 3a and 4a and the lower outlets 3b and 4b. Then, the improved material thrown inside is slid and moved from the diaphragm 7A or 7B, 7C supported on the inclined surface so as to be swingably displaceable to the discharge ports 3b, 4b.

  Here, in the base machine 1, the upper body 11 is supported by the lower traveling body 10 through a turning portion so as to be turnable. The upper main body 11 is connected to the leader support back stay 15, the driver's seat 12, the leader hoisting wire 16 and its winch (not shown), the bucket lifting and lowering wire 17 and its winch (not shown), and the rear panel. The rear stage 13 on which 14a, the motor 14b, etc. are mounted is provided.

  The leader 2 is pivotally supported on the base machine side catch fork by a coupling pin or the like, and is arranged between the guide members 20 extending in the vertical direction on both sides on the front side (the right side in FIG. 1) and the guide members 20. A pin rack (not shown) extending in the vertical direction and meshing with the lifting device 29, a guide member 22 provided on one side for guiding the lifting and lowering of the bucket 3, a pulley device 23 provided on the top, and a lower side. In addition, there is an anti-vibration means 25 for suppressing the vibration of the hollow tube 5.

  As shown in FIG. 1, the elevating device 29 includes a guide give 29 a that fits with the guide member 20, a sprocket (not shown) that is pivotally supported so as to mesh with the pin rack and that is driven by a hydraulic motor, and the hopper 4. The lower connection part 29b couple | bonded with the coupling part 51 is provided.

  The attachment 50 has a hopper 4 (from the top to the bottom) (this hopper has a side wall 40 defining the upper inside as shown in FIG. 2, an introduction part 45 connected to the lower side of the side wall 40, and an introduction part 45. And an auger 26 provided on the lower side of the joint portion 51 (this auger includes a rotating mechanism casing 26a and a joint portion 51 connected to the hollow tube 5). , And a motor 28 mounted on the casing 26a), a swivel device 27, and the like. The auger 26 enables the hollow tube 5 to be rotated by a gear mechanism built in the housing 26a and driven by a motor 28 or the like. The swivel device 27 is supported by a plurality of arms or the like provided below the housing 26a. The swivel device 27 is made of an improved material introduced into the upper space defined by the hopper 4, that is, the side wall 40. It is possible to transfer through the hollow tube 5. In other words, the hollow tube 5 is operatively connected to the gear mechanism in the housing 26 a to be rotatable, and the upper end side can introduce the improving material via the swivel device 27. Reference numeral 26b in FIG. 1 is a guide give provided in the housing 26a and slidably fitted to the guide member 20.

(Main part) The bucket 3 and the hopper 4 are arranged so as to cover the inclined surfaces 31 and 41 of the side walls 30 and 40 and the inclined surfaces 31 and 41 as shown in FIGS. The vibration plates 7A to 7C (7) are supported so as to be freely oscillating and displaceable, and the vibrator 8 is mounted on the back surface of each vibration plate.

  The spring 6 is an example of a compression coil spring, but may be any elastically deformable material such as a leaf spring or rubber, that is, an elastic body. The vibrator 8 is a commercially available small-sized vibrator, and an example in which the vibrator 8 is attached to all the diaphragms 7A to 7C has been described, but may be omitted as necessary. Moreover, although the diaphragms 7A-7C are formed in the shape corresponding to the target inclined surface, the operation | movement is the same. For this reason, in the following description, it describes with the diaphragm 7 except the description related to the shape of a diaphragm.

(Bucket) In FIGS. 4 and 5, the bucket 3 has a container shape, and the inclined surface 31 constituting a part of the side wall 30 defining the inner space and the discharge port 3 b are opened and closed by the lid member 38. A switching means 35 for swinging, a substantially U-shaped extension member 39 that is swingably connected to the lid member 38 and guides the improved material discharged from the outlet 3b further from the inside of the lid member 38, and an inclined surface 31. And a diaphragm 7A (7) supported so as to be swingable and displaceable via a plurality of springs 6. Reference numeral 30a denotes a connecting portion that protrudes from each upper end surface of the opposing side wall 30 and connects the leading end of the lifting wire 17 (see FIG. 1).

  Among these, the inclined surface 31 forms a container-shaped bottom surface, and leads to the discharge port 3b provided on the lower side of the vertical surface of the side wall 30. A pair of metal fittings 32 a and 32 b are provided on the outer surfaces of the inclined surface 31 and the lid member 38. The switching means 35 is a pneumatic cylinder having a cylindrical portion 36 and a retracting piston rod 37. The cylindrical portion 36 is supported between the metal fittings 32a so as to be swingable via a pin 36a. The tip of the piston rod 37 is supported so as to be swingable through a pin 37a. This cylinder holds the lid member 38 in the closed position in the state of FIG. 4A where the piston rod 37 is immersed in the cylinder 36, and the lid member in the state of FIG. 38 is switched to the open position.

  That is, the lid member 38 has a substantially rectangular tube shape, and is attached to the lower end of the right vertical surface defining the discharge port 3b so as to be rotatable by the hinge 38a. An extension member 39 is pivotally supported on the lid member 38 via a guide means (not shown) so as to be movable by a predetermined distance. The extension member 39 is accommodated in a frame 33 (described later) with the lid member 38 in a closed state with a part of the lid member being overlapped inside, and the rectangular cylindrical end opening is lowered in the open state of the lid member 38. The connection status received from. The extension member 39 can be omitted.

  The diaphragm 7A is a rigid plate that is substantially the same size as the inclined surface 31, but may not have a shape that covers the entire inner surface of the inclined surface 31, but may have a shape that covers a part of the inner surface of the inclined surface 31. The diaphragm 7 is supported so as to be swingable and displaceable with a plurality of springs 6 interposed on the inclined surface 31. That is, substantially concave fittings 60 and 61 are mounted on the opposing surfaces of the inclined surface 31 and the diaphragm 7 at locations where the springs 6 are disposed. The spring 6 is a compression coil spring, and both end portions are joined in the concave shape of the fixture 60 or 61. The vibrator 8 is attached to the substantially central portion of the back surface of the diaphragm 7, vibrates when electric power is supplied from a wiring (not shown), and the vibration is transmitted to the diaphragm 7A.

  A covering 34 made of a rubber material or the like is disposed between the upper edge of the diaphragm 7 and the corresponding inner surface of the side wall 30 and between the side edge in the width direction of the diaphragm 7 and the corresponding inner surface of the side wall 30. The improvement material is disposed so as not to enter the back side of the diaphragm 7. In FIG. 5, the covering provided between the side edge in the width direction of the diaphragm 7 and the corresponding inner surface of the side wall 30 is omitted. Each covering is set to have elasticity, thickness, or the like so that the vibration characteristics of the diaphragm 7 are not impaired.

  By the way, in this example, two or more springs 6 are used on the upper side and one or two on the lower side, for a total of three or four. The number of springs 6 used is designed so that the diaphragm 7 is irregularly swung in as many directions as possible in consideration of the size and inclination angle of the diaphragm 7. In that case, as each spring 6, for example, a spring having a different spring constant may be used. As a specific example, when changing the spring stroke, for example, as shown in the lower frame of FIG. 6, the spring stroke makes the upper spring 6 longer than the lower spring 6. When changing the spring constant, for example, the upper spring 6 having a smaller spring constant than the lower spring 6 is used. Thus, the diaphragm 7 is supported such that the amplitude w on the input port 3a side is larger than that on the discharge port 3b side, and it is possible to more effectively prevent the improvement material from adhering.

  The above bucket 3 is held by the frame 33. The frame 33 has a bracket (not shown) that is slidably fitted to the leader side guide member 22, and the bracket is fitted to the guide member 22 with the bucket 3 held inside. As shown in FIG. 1, the bucket 3 is lifted up slightly above the hopper 4 from the ground surface side by winding the lifting wire 17. In the raised position, the bucket 3 drives the switching means 35 so that the lid member 38 is switched from the closed state to the open state. Then, the improvement material in the bucket 3 is slid and moved on the diaphragm 7, and is moved into the hopper 4 through the discharge port 3 b, the cylindrical shape of the lid member 38, and the U shape of the extension member 39.

  When the improvement material adheres to the difficult material as described above, that is, the vibration plate 7, if the vibration plate 7 is vibrated by driving the vibrator 8, the attachment of the improvement material is efficiently suppressed. Further, in the bucket 3 described above, the vibration applied to the bucket itself, that is, the side wall 30 can be reduced by attaching the vibrator 8 to the diaphragm 7 as compared with the configuration in which the vibrator is attached to the outer wall of the bucket. The vibration applied to the monitoring device such as the monitor is suppressed, and the failure due to the vibration is less likely to occur.

(Hopper) In FIG. 2 and FIG. 3, the improved material put into the upper side wall 40 constituting the hopper 4 is introduced from the discharge port 4b through the cavity of the introduction portion 45 and the joint portion 51, the swivel device 27, and the like. It can move into the hollow tube 5. Further, in the upper side wall 40 constituting the hopper 4, the upper input port 4 a is formed larger than the lower discharge port 4 b in order to make it easier to put the improving material, and the side wall 40 defining the inside of the side wall 40. A part of the inclined surface 41 is provided, and the improved material introduced into the inside through the inlet 4a is slid from the inclined surface 41 to the outlet 4b.

  The hopper 4 has a flange 43 on the outer peripheral side of the discharge port 4b, and the flange 43 is integrated with the introduction part 45 by being coupled to a flange 45a provided on the introduction part upper side. Further, in the side wall 40, an air injection nozzle 46 that injects compressed air toward the discharge port 4b, an air valve 47 provided on the upper side of the introduction portion 45, and a hollow provided near the air valve 47. An air supply nozzle 46 </ b> A that provides pressure inside the pipe 5 is provided.

  First, the air valve 47 includes a valve main body 47a mounted on the upper inner peripheral surface of the introducing portion 45, and a valve lid 47b pivotally supported by the valve main body 47a. The valve lid 47b is always in an open position that hangs down by its own weight with respect to the valve body 47a, and when the improved material is discharged from the tip of the hollow tube 5, that is, when compressed air is injected from the air supply nozzle 46A during pile construction The valve is closed by being pressed by the jet air. However, the opening / closing mechanism of the air valve 47 may have other structures.

  The air injection nozzle 46 and the air supply nozzle 46A are connected to a compressor on the ground surface via a dedicated air supply pipe, and can individually inject required pressure air when necessary. That is, the air injection nozzle 46 makes it possible to eliminate clogging in the vicinity of the discharge port by blowing off the improved material that easily collects in the vicinity of the discharge port 4b with a predetermined air pressure. As described above, the air supply nozzle 46 </ b> A discharges the improved material put into the tube from the front end opening of the hollow tube 5 by switching the air valve 47 to the closed state or pressurizing the inside of the hollow tube 5 in the closed state. Make it easy to do.

  Further, the side wall 40 is formed into a rectangular frame body with four vertical surfaces 40a, 40a, 40b, 40b on the upper side, and four inclined surfaces 41a whose lower side is inclined from the four sides of the frame body toward the discharge port 4b. , 41b, 41c, 41c. In other words, the vertical surfaces 40a and 40a are located on the long side (the side along the line BB in FIG. 2B) and face each other. The vertical surfaces 40b and 40b are located on the short side (the side along the line AA in FIG. 2B) and face each other. On the other hand, the inclined surfaces 41a and 41b are located on the short side (see FIG. 3B) and face each other. The inclined surfaces 41c and 41c are located on the long side (see FIG. 3A) and face each other.

  On the inclined surface 41c and the inclined surface 41a, there are rigid plates 7B, 7B, 7C made of rigid plates which are arranged so as to cover each inclined surface and are supported by a plurality of springs 6 so as to be swingable and displaceable. Has been placed. Each diaphragm 7B and 7C has a lower end extending to the discharge port 4b and is bent substantially vertically. The diaphragm 7B is substantially the same size as the inclined surface 41c or has a size that extends to the discharge port 4b and covers the inner surface of the inclined surface 41c. The diaphragm 7C is substantially the same size as the inclined surface 41a or extends to the discharge port 4b and covers the inner surface of the inclined surface 41a. In addition, each diaphragm 7B is supported so as to be swingable and displaceable with a plurality of springs 6 interposed with respect to the inclined surface 41c, and the diaphragm 7C is swingably displaced with a plurality of springs 6 interposed with respect to the inclined surface 41a. It is supported freely. In this case, substantially concave fittings 60 and 61 are mounted at the locations where the springs 6 are arranged on the opposing surfaces of the inclined surface 41c and the diaphragm 7B and the opposing surfaces of the inclined surface 41a and the diaphragm 7C. The spring 6 is a compression coil spring, and both ends are joined and fixed in the concave shape of the fixture 60 or 61. Vibrator 8 is attached to the center of the rear surface of diaphragms 7B and 7C, vibrates when power is supplied from a wiring (not shown), and the vibration is transmitted to diaphragms 7B and 7C. However, the vibrator 8 may be hydraulic or pneumatic.

  Further, a rubber material is provided between the upper edges of the diaphragms 7B and 7C and the corresponding inner surface of the side wall 40, between the diaphragm 7B and the diaphragm 7C, and between the diaphragm 7B and the inner surface of the inclined surface 41b. The improvement materials are treated so that they do not enter the back side of each diaphragm. Each covering body 49 is set to have elasticity, thickness, or the like so that the vibration characteristics of the diaphragm 7 are not impaired.

  By the way, also in this example, each diaphragm is supported by a total of three springs 6, two on the upper side and one on the lower side. The number of springs 6 used is designed so that the diaphragm 7 is irregularly oscillated in as many directions as possible in consideration of the size and inclination angle of the diaphragm 7 and the arrangement location. Further, as each spring 6, for example, springs having different spring constants or different spring constants may be used. As a specific example, when changing the spring stroke, for example, as shown in the lower frame of FIG. 6, the spring stroke makes the upper spring 6 longer than the lower spring 6. When changing the spring constant, for example, the upper spring 6 having a smaller spring constant than the lower spring 6 is used. Thus, the diaphragm 7 is supported such that the amplitude w on the input port 3a side is larger than that on the discharge port 3b side, and it is possible to more effectively prevent the improvement material from adhering. These are the same as for bucket 3.

  The configuration as described above is a test conducted by the present inventors, for example, an aspect 1 in which the amplitude is substantially uniform above and below the diaphragm, and an aspect in which the lower side of the diaphragm is larger in amplitude than the upper side. 2. As for the aspect 3 in which the upper side of the diaphragm is larger in amplitude than the lower side, when the improved material is put into the bucket 3 and the hopper 4 under the same conditions, the result of the visual observation is that the improved state of the aspect 3 It was confirmed that the improved material slides best on the diaphragm 7. In other words, the diaphragm 7 that is inside the bucket 3 and the hopper 4 and supported by the plurality of springs 6 with respect to the inclined surfaces 31 and 41 has a larger amplitude on the upper side than the lower side near the discharge port. In this case, for example, it is possible to further improve the suppression effect on the adhesion of the improvement material as compared with the support configuration in which the diaphragm 7 is vibrated with substantially the same amplitude in the upper and lower sides.

  Further, a rubber material is provided between both side edges in the width direction of the diaphragm 7 and the inner corresponding portions of the inclined surfaces 41a and 41c, and between the upper edge of the diaphragm 7 and the inner corresponding portions of the vertical surfaces 40a and 40b. The improvement material is processed so that it does not enter the back side of the diaphragm 7 with a covering 48 made of, for example, interposed. Each covering 48 is set to have elasticity and thickness so that the vibration characteristics of the diaphragm 7 are not impaired.

  In the hopper 4 described above, the improving material in the bucket 3 is moved from the charging port 4a into the hopper. The improved material transferred into the hopper 4 slides on the diaphragms 7B and 7C and is hollow from the exhaust port 4b and the valve lid 47b of the air valve 47, the introduction portion 45 and the joint portion 51, and the swivel device 27. It is dropped and moved into the tube 5. In this case, when the improved material adheres to the material which is difficult to handle as described above, that is, to the diaphragm 7, if the vibrator 8 is driven to vibrate the diaphragm 7, the adhesion of the improved material is efficiently suppressed. . In addition, by jetting compressed air from the air injection nozzle 46 toward the discharge port 4b, the improvement material that easily collects in the vicinity of the discharge port 4b is blown off by a predetermined air pressure to prevent clogging in the vicinity of the discharge port.

(2nd form) The ground improvement construction machine of FIG. 6 is a type which penetrates the hollow tube 5 with the vibro hammer 9. As shown in FIG. In this description, the same reference numerals are assigned to the same portions as those in the first embodiment, and a duplicate description is omitted as much as possible, and changes are described in detail.

  In this ground improvement construction machine, a carrying bucket 3 that is lifted and lowered along the leader 2 and a hopper 4 that puts an improvement material such as sand accommodated in the bucket 3 in the upper part can be raised and lowered along the leader 2. A hollow tube 5 that is penetrated into or extracted from the ground and a vibrator hammer 9 that is provided at the top of the hollow tube 5 and penetrates the hollow tube 5 are provided.

  The hopper 4 has an inclined surface 41 on the lower side of the side wall 40 that defines the upper side, and is coupled to the upper portion of the hollow tube 5 via a joint portion 52. And the improvement material such as sand thrown into the inside through the insertion port 4a is discharged from the upper surface of the diaphragm 7B supported by the plurality of elastic bodies 6 so as to be swingable and displaceable with respect to the inner surface of the inclined surface 41, Further, it slides from the inside of the cavity of the joint portion 52 into the hollow tube 5. The diaphragm 7B is not provided with the vibrator 8 such as the diaphragm 7A of the bucket 3 and the diaphragms 7B and 7C of the first form. The vibrator hammer 9 is connected to the upper portion of the joint portion 52 via a sheave block 18 provided between the shock absorber 9a, the suspension wire 19, and a pulley device (not shown) provided on the top of the leader 2. It is suspended so that it can be raised and lowered.

  In the above embodiment, since the hollow tube 5 is penetrated by the vibro hammer 9, the vibration of the vibro hammer 9, particularly the vibration in the vertical direction, is transmitted / resonated to the diaphragm 7 via the spring 6. This advantage can be effectively utilized as the vibration source of the diaphragm 7 supported by the vibration of the vibrator hammer 9 via the spring 6. The adhesion preventing action is excellent because the vibration of the vibration plate 7 is irregular because the vibration due to the vibration in the vertical direction by the vibratory hammer 9 is different from the expansion / contraction direction of the spring 6.

  In addition, the ground improvement construction machine of this invention should just be equipped with the structure specified by a claim, and can change variously about details. For example, the shape of the bucket or hopper is not particularly limited except for the requirement that the side wall has an inclined surface. Moreover, the shape of the upper inlet and the lower outlet, the air valve provided at the outlet, and the like can be changed as appropriate. The vibrator is not particularly limited except for the size, but in terms of frequency, a vibrator having a large amplitude at a low frequency of 10 to 70 Hz is preferable.

1 ... Base machine (10 is the lower body, 11 is the upper body)
2. Leader (20 is a guide member)
3 ... Bucket (3a is the inlet, 3b is the outlet)
4 ... Hopper (4a is the inlet, 4b is the outlet)
5 ... Hollow tube 6 ... Spring (elastic body)
7... Diaphragm 8... Vibrator 9... Vibro hammer 30... Side wall 31... Inclined surface 34. ... Inclined surface 45 ... Introduction pipe 46 ... Air injection nozzle (air injection means)
46A ... Air supply nozzle (air supply means)
47 ... Air valve 48 ... Cover 49 ... Cover 60 ... Mount 61 ... Mount

Claims (6)

A carrying bucket that is raised and lowered along a standing leader and a hopper that is placed with an improvement material such as sand contained in the carrying bucket is provided at the top and can be raised and lowered along the leader and penetrates into the ground. And a hollow tube that is pulled out or pulled out, and the carrying bucket and the hopper have an inclined surface on the side wall that defines the inside, together with an upper inlet and a lower outlet, and are introduced into the interior A ground improvement construction machine that moves the material from the inclined surface to the discharge port,
The carrying bucket or / and the hopper are arranged so as to cover the inclined surface or a part of the inclined surface, and have a diaphragm supported so as to be swingable and displaceable via a plurality of elastic bodies. Ground improvement construction machine characterized by that.  The ground improvement construction machine according to claim 1, wherein the vibration plate has a vibrator attached to a back surface thereof, and is oscillated by vibration of the vibrator.  The ground improvement construction machine according to claim 1, wherein the hollow tube has a vibratory hammer at the top, and the diaphragm is swung by vibrations of the vibratory hammer.  The ground improvement construction machine according to any one of claims 1 to 3, wherein a lower end of the diaphragm extends to the discharge port.  The ground improvement construction machine according to any one of claims 1 to 4, wherein the hopper includes air supply means for injecting air toward the discharge port. It said side wall has a plurality of the inclined surfaces, together with the diaphragm is supported independently through the elastic member with respect to the respective inclined surfaces, the gap between the moving plate between oscillation adjacent The ground improvement construction machine according to any one of claims 1 to 5, further comprising a covering body that is slidably displaceable.

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