JP5757619B2 - Ground improvement device and leader undulation method - Google Patents

Description

  The present invention relates to a ground improvement device and a method for raising and lowering a leader separately from a wire for raising and lowering a leader, in which the leader can be easily raised from a lying state to at least a predetermined inclination angle.

  In recent years, due to the large scale construction for ground improvement etc., the use of a large base machine and a long leader of all sizes, as well as the time and cost for carrying in a large crane, ensuring the earth strength of the installation site, assembling and dismantling In addition, the frequency of high-altitude work is high and skill is required. As an example, the ground improvement apparatus of FIG. 8 includes a base machine 1 and a reader 2 pivotally supported at the tip of the base machine, an upper end thereof pivotally supported by a metal fitting 24 on the back of the reader, and a lower end of the base machine. A three-point support stay 3 that is pivotally supported by both side corresponding portions of the one, and a leader hoisting wire 8 that is fed from a winch (not shown) mounted on the base machine 1 and whose tip is connected to the upper side of the reader. It has.

  FIG. 9 shows the relationship between the leader undulation angle θ (3 to 80 degrees) and the tension applied to the leader undulation wire 8 in the above ground improvement device. From this graph, if the undulation capability (wire strength, winch capability, winch support frame 12, stability of the base machine 1, etc.) by the wire 8 is assumed to be 100 t, the leader can be removed from the wire up to θ = 40 ° except for the wire. It must be lifted up by the auxiliary means, and then brought up to a vertical state by the reader supporting wire 8.

  In the actual work, in the case of FIG. 8, the raising / lowering operation is performed using a plurality of auxiliary heavy machines K1, K2 as auxiliary means for erection of the leader for raising the leader 2 from the lying down state. In the leader standing work, the upper side of the leader 2 is lifted by a region by the suspension rope R1 lowered from the crane of the auxiliary heavy machine K1 in (a). Subsequently, in the area b, the reader 2 is pulled up to the final vertical state by the wire 8. In that case, the lower end side of each stay 3 is pulled up by the suspension rope R2 lowered from the crane of the auxiliary heavy machine K2, and finally fixed to the base machine corresponding part.

  In the above-described work, two or more auxiliary heavy machines K1, K2, etc. are required, which not only increases the cost but also requires a dangerous slinging work at a high place (for example, work for attaching and detaching the tip of the rope R1 to the upper side of the leader). . By the way, Patent Document 1 discloses a structure in which the above slinging work can be performed near the ground surface.

JP-A-9-256363

  However, the structure of Patent Document 1 requires a guide rail provided on the back side of the reader, a slider provided slidably on the guide rail, and an upper and lower stopper provided on the upper and lower sides of the guide rail to restrict the sliding of the slider. As a result, the operation becomes complicated. In the conventional structure, when the ground improvement area becomes narrow, it is often difficult to secure a place for installing the auxiliary heavy machine, and the size and type of the auxiliary heavy machine used may be restricted.

  An object of the present invention is to realize a leader erection assisting means that is simpler than the above-described auxiliary heavy machine and is not subject to installation place restrictions in the ground improvement device, so that the undulation work of the leader can be performed as quickly as possible. It is in. Other purposes will be clarified in the following description.

  In order to achieve the above object, the present invention, when specified with reference to the drawings, shows a base machine 1 and a reader 2 pivotally supported at the tip of the base machine, and an upper end pivoted on the back surface of the reader. Leader hoisting wires that are fed from a pair of support stays 3 whose lower ends are arranged on both sides of the base machine and winches 14 mounted on the base machine and whose tips are connected to the upper side of the leader. In the ground improvement device provided with 8, the installation base 41 arranged on the ground surface side and the lower end portion are installed as the auxiliary means 4 for erection of the leader that stands up the leader from the lying down state separately from the wire 8. A support arm 44 having a pad 43 that is rotatably supported by the base 41 and is provided at an upper end portion thereof and that contacts the front surface of the reader 2 and receives a reader load; And a telescopic member 45 that can be variably adjusted to connect the different ones at both ends to the support arm side, and the reader 2 is formed by increasing the total size of the telescopic member 45. It is characterized in that it rises from a lying state via the support arm 44. The present invention as described above is more preferably embodied as follows.

(A) The expansion / contraction member 45 is configured only by a hydraulic cylinder that protrudes and retracts the rod 47 from the cylinder 46 or has the hydraulic cylinder in a part in the longitudinal direction (Claim 2). .
(A) The telescopic member 45 is configured to be juxtaposed on the left and right sides of the support arm 44 via projecting arms 48 (Claim 3).

(C) The installation base 41 is connected to the front side of the base machine 1 (Claim 4).
(D) A guide rail 53 is provided on both sides of the base machine 1 in the longitudinal direction of the base machine, the lower end of the stay 3 is slidably supported by the guide rail 53, and the rear side of the guide rail It is the structure which can be fixed by the latching means 5 (Claim 5).

(E) Claim 6 specifies the method of raising and lowering the leader using the above ground improvement device. Using the ground improvement device according to any one of claims 1 to 5, A first step of switching from a lying state to a predetermined inclination angle in the middle of standing by means 4 and a second step of switching from the predetermined inclination angle to a vertical state by means of the undulating wire 8 are characterized.

  In the first aspect of the invention, the auxiliary means is installed base as illustrated in FIG. 1, the support arm interposed between the installed base and the reader in a state where the pad is in contact with the front surface of the reader, and all dimensions are variably adjustable. Therefore, the reader can be raised and lowered easily and easily compared to the conventional auxiliary heavy machinery that lifts the reader. Can do. Moreover, since the auxiliary means of the present invention does not have a slinging work at a high place, safety can be ensured simultaneously with cost reduction.

  In the invention of claim 2, it is confirmed that the expansion and contraction member is not limited to a configuration having a hydraulic cylinder that protrudes and retracts the rod from the cylinder in a part of the longitudinal direction as in the embodiment, but includes only the hydraulic cylinder. Is specified, and versatility is obtained.

  In the invention of claim 3, since the expansion and contraction members are juxtaposed on both the left and right sides of the support arm via the overhanging arm as in the embodiment, it is possible to exert double proof strength against a large load.

  In the invention of claim 4, since the installation base is connected to the front side of the base machine, a load or stress applied to the installation base can be received as a reaction force as shown in FIG. Move following the base machine.

  In the invention of claim 5, since it has a bearing that is slidably fitted to the guide rail and guides the lower end portion of the support stay so as to be swingable, the reader as shown in FIGS. The assembly / disassembly operation of the pair of support stays during the up-and-down operation can be efficiently performed without using an auxiliary heavy machine as in the conventional case.

  In the invention of claim 6, as the method of raising and lowering the leader using the ground improvement device described above, the advantages of each configuration can be obtained, thereby making it easier and less restricted by the installation place than the method using the conventional auxiliary heavy machine, and the leader There is an effect that undulation work can be performed quickly and safely.

(A), (b) is the model side view which shows the incorporating aspect of the auxiliary | assistant means at the time of starting a reader | leader from an inverted state with the ground improvement apparatus of a form example, and the enlarged view of the A1 part. (A), (b) is the model side view for demonstrating the 1st process which started up the said reader | leader by the auxiliary | assistant means, and the enlarged view of the A2 part. (A), (b) is the model side view for demonstrating the 2nd process which started up the said reader | leader with the wire for raising a leader, and the enlarged view of the A3 part. It is a model side view of the said auxiliary | assistant means. (A), (b) is the model side view which shows the member relationship of the auxiliary | assistant means in the state which raised the reader | leader in the predetermined inclination angle by the said auxiliary | assistant means, and the schematic diagram seen from the right side. (A), (b) is the side view and top view which show the detailed structure of a base machine. (A) is a half cross-sectional plan view of the main part of the base machine, (b) is a view from the arrow A of (a) showing the rear end of the guide rail, and (c) is a diagram in which a bearing is fitted to the guide rail, (D) is a B arrow view of (a) which shows the rear end part of a guide rail, (e) is the figure which fitted the bearing to the guide rail. (A) is a schematic side view which shows the operating state of the conventional ground improvement apparatus, (b) is a schematic side view which shows the state which tilted the reader | leader of the apparatus. It is a graph which shows the relationship between the undulation angle of the said leader, and wire tension.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In this description, after the device structure of the present invention is clarified, the usage or operation is referred to. In each figure, since the basic structure of the ground improvement device is the same as the conventional structure, the same reference numerals as in FIG. 8 are used for the same parts, and only different parts or newly added members are given different reference numerals. Yes. Moreover, in each figure, a part is abbreviate | omitted or modeled from the restrictions on drawing.

As shown in the drawings, the ground improvement device in the form of (device structure) includes a self-propelled base machine 1, a reader 2 pivotally supported to the tip side of the base machine 1, and an upper end pivoted to the reader 2. A pair of three-point support type (left and right) support stays 3 that are supported and whose lower ends are arranged on both sides of the base machine 1, a leader erection assisting means 4 for raising the leader 2 from a lying state, and a base A leader hoisting wire 8 that is fed out from the winch 14 mounted on the machine 1 and whose tip is connected to the connecting portion 25 on the upper side of the reader 2; guide rails 53 that are arranged in the front-rear direction on both sides of the base machine 1; A bearing 6 that slidably supports the lower end portion of each stay 3 on the guide rail 53, and a pin 5 as a locking means that detachably fixes the bearing 6 to a fixed position in the rear of the guide rail 53.

  Here, in the base machine 1, the main frame 10 is supported by a lower traveling body having a caterpillar 11 as in the prior art so as to be able to turn through a turning portion. As shown in FIG. 3, the main frame 10 includes a cockpit arranged on one side of the front, a support portion 13 protruding from the left and right middle portion of the front edge, two winches 14 and a frame 12 provided in a substantially central portion, A stage 15 or the like connected to the rear edge and extending rearward is provided. On the upper side of the frame 12, a pulley for guiding a wire and a hanging rope is incorporated. One of the winches 14 is for the wire 8, and the other is for a suspension rope (not shown) that constitutes elevating means, for example. A driving device 17 such as an air tank, a compressor, and a motor is mounted on the upper surface of the stage 15, and a balance weight 75 that is moved back and forth by a hydraulic cylinder 7 as driving means described later is provided on the lower surface. . Reference numeral 16 denotes a handrail.

  The reader 2 is pivotally supported on the support portion 13 by a pin 26 or the like as shown in FIG. The reader 2 has a length corresponding to the purpose of connecting a required number of leader forming portions by a coupling means or the like. The reader 2 includes a guide rail 21 provided on the front surface and extending in the vertical direction on both sides, a stay metal fitting 24 provided on the upper side of the back surface, a plurality of wire connecting portions 25, and the like.

  The guide rails 53 on both sides are arranged in a state of being held substantially horizontally and in parallel on horizontal frames 51 and 52 arranged in the left and right direction at the front and rear portions of the main frame 10. The cross-sectional shape is such that a guide groove 53a is formed in the longitudinal direction on the upper surface of the rectangular frame. A pillar 54 that is one step higher is provided at the front end of each guide rail 53. A guide plate portion 55 is continuously arranged at the rear end of each guide rail 53. As shown in FIG. 7, the guide plate portion 55 includes a guide groove 55a that is continuous with the guide groove 53a, an opposing fixed plate portion 56 that is coupled to the lower surface and defines both sides of the guide groove 55a, and each fixed plate. The portion 56 has a plurality of pin holes 56a formed so as to penetrate the coaxial line. Further, rear stoppers 57 are provided on both sides of the guide plate portion 55. Each of the rear stoppers 57 has an engaging portion 57a that opens toward the front, and is disposed so as to face each other in a state where a part thereof is joined to a corresponding portion of the guide rail 53. In the above-described guide groove 55a, a stay bearing 6 described later is slidably disposed from the guide groove 53a as shown in FIGS. 7C and 7E.

  The bearing 6 has a plate shape in which the main body 60 is fitted in the guide grooves 53 a and 55 a, and extends to the left and right along the wide receiving plate 62 integrated with the upper end surface of the main body 60 and the front end of the receiving plate 62. A bar-shaped restricting portion 63, a support portion 65 erected at the center of the receiving plate 62, and a concave shaft hole 66 provided in the support portion 65. The main body 60 is provided with a plurality of through holes (not shown) that coincide with the pin holes 56a. The bearing 6 is incorporated in a state in which the main body 60 is slidably fitted in the guide grooves 53a and 55a with respect to the corresponding guide rail 53, and the restricting portion 63 hits the column 54 forward. Further, the position is restricted by the restriction portion 63 being locked to the engagement portion 57a of the rear stopper 57 to the rear. When the pin 5 is inserted into the pin hole 56a, the through hole of the main body 60, or the pin hole 56a in the state where the restricting portion 63 is locked to the engaging portion 57a, The position is fixed to 56.

  The bearings 6 on both sides are fitted to the shaft holes 66 so that the spheres 35 formed at the lower ends of the stays 3 can swing. That is, each stay 3 has a crotch shape at the upper end, and is engaged so as to be rotatable using a connecting pin 37 or the like protruding from the left and right of the metal fitting 24 provided on the upper rear surface of the reader 2. (See enlarged portion in FIG. 1). On the lower side of the stay 3, a hydraulic cylinder is integrally connected, and has a rod 34 that is driven into and out of the cylinder 33. The lower end or the distal end of the rod 34 is formed in a sphere 35. The lower end of each stay 3 is fitted and supported so that the sphere 35 can swing freely in the shaft hole 66 of the bearing.

  On the other hand, on the lower surface of the stage 15, there are two guide rails 74 provided in the front-rear direction as shown in FIG. 6, a slider (not shown) slidably supported by both guide rails 74, and Left and right balance weights 75 attached to the slider, and a hydraulic cylinder 7 as drive means for moving the balance weights 75 back and forth via the slider are provided. That is, the hydraulic cylinder 7 is supported in a state where the connecting portion 72 provided at the corresponding end is fixed to the metal fitting 78 whose position is fixed on the stage side, and the rod 71 is coupled to a part of the slider. Yes. For this reason, in this structure, the rod 1 of the hydraulic cylinder 7 is protruded rearward according to the inclination angle of the leader 2, and the balance weight 75 is moved rearward through the slider, whereby the base machine accompanying the inclination of the leader. The fluctuation of the center of gravity position before and after is suppressed to a small extent, and the base machine can be reliably prevented from falling in the tilting direction.

  On the other hand, the auxiliary means 4 has an installation base 41 arranged on the ground surface in front of the base machine and a lower end portion 44a supported rotatably on the installation base 50, and is provided on the upper end portion 44b so as to receive a reader. A support arm 44 having a pad 43 for use, an overhanging arm 49 that is fixed in the vicinity of the middle of the support arm 44 in the longitudinal direction and protrudes to the left and right of the support arm 44, and an overhang of the installation base 41 and the support arm 44 A hydraulic cylinder 45 that can be variably adjusted in all dimensions is provided, which is connected to the arm 49 at one of the ends different from each other. The hydraulic cylinder 45 corresponds to a telescopic member, and a plurality (two in this example) are used as a set.

  The installation base 41 is a member that receives a load or stress received from the reader 2, and protrudes at a predetermined interval from the connection tool 42A that protrudes on the base machine side and on the side away from the base machine 1. The left and right connecting tools 42 </ b> B are provided, and a vertically long joint 42 </ b> C provided at an end on the base machine side. The coupling tools 42A and 42B and the joining portion 42C are concave so as to sandwich the mating attachment portion.

  The above installation base 41 is connected to the base machine 1 via the connection member 40. One end of the connecting member 40 is coupled to the joining portion 42C, and the other end is coupled to the connecting portion 18 projecting from the frame portion near the front left and right middle of the base machine 1 as shown in the enlarged view of FIG. Thereby, in this structure, the stress in the X direction in FIG. 5A applied to the installation base 41 is received by the weight of the base machine 1 to prevent the installation base 41 from moving in the same direction.

  One end 44a of the support arm 44 is pivotally supported by the connector 42A via a pin P or the like. A pad 43 that contacts the front surface of the reader 2 and receives the reader load is connected to the other end 44b through a pin P or the like so as to be swingable. Here, as inferred from FIG. 5, the pad 43 has a shape in which the front side is slidably fitted to the leader side guide rails 21, 21 and abuts against the front surface of the reader 2 to receive the reader load. The pad 43 has a pair of sandwiching pieces 43a projecting from the back surface, and is pivotably connected to the other end 44b of the support arm disposed between the sandwiching pieces via a pin P or the like. . More specifically, the pad 43 is configured as a movable part that is driven by a hydraulic cylinder on both sides with respect to the fixed part protruding from the clamping piece 43a, although not shown. A cylinder of the hydraulic cylinder is fixed to the fixing portion. The movable parts on both sides are provided with a fitting part that is engaged with and disengaged from the guide rail 21 provided on the front inner side, an attachment part that is provided on the rear side and rotatably connected to the fixed part, and is provided on the inner side. A connecting portion connected to the rod of the hydraulic cylinder via a connecting arm. In this structure, the two movable parts are movable when the hydraulic cylinder is engaged with the corresponding guide rail 21 in a state in which the rod is immersed, and when the hydraulic cylinder is switched to the protruding state of the rod. The part is rotated outward with the attachment part as a fulcrum through the connecting arm, and the fitting to the guide rail 21 is released.

  A pair of clamping pieces 48 project from the left and right extension arms 49, respectively. The hydraulic cylinder 45 includes a cylinder 46 and a rod 47, and the mounting end 46a of the cylinder 46 is pivotally supported via a pin P or the like with respect to the coupling tool 42B, and the mounting end 47a of the rod 47 corresponds. The pinching piece 48 is pivotally supported via a pin P or the like. In this structure, the rod (corresponding portion of the expansion / contraction member) 47 is connected not to the support arm 44 but to the extension arm 49 so as to act as a component force in the direction of lifting the support arm 44 when protruding from the cylinder 46. I have to.

(Operation) In the above-described leader raising method using the ground improvement device, the leader 2 is switched by the auxiliary means 4 from the lying down state to the predetermined inclination angle in the middle of standing, or on the contrary, from the predetermined inclination angle to the lying down state. The first step and the second step of switching from the predetermined inclination angle to the predetermined inclination angle from the vertical state or vice versa by the hoisting wire 8 are performed.

  In the first step, first, the lower end side of the reader 2 is pivotally supported by the support portion 13 of the base machine with the pin 26 and is supported by the ground-side gantry 9. Next, the constituent members of the auxiliary means 4, that is, the installation base 41, the support arm 44, the pad 43, and the hydraulic cylinder 45 are set in the corresponding portions as shown in FIG. 1, and the installation base 41 is the base machine 1 The connecting member 40 is connected to the connecting member 40 by bolts or the like. As other preparatory operations, as shown in FIG. 1, the lower mounting base (rod sphere 35) on each stay side is fitted into the guide groove 53 a of the slide rail 53 via the bearing 6, and the balance weight 75 is attached to the hydraulic cylinder 7. To the last side.

  Thereafter, when the leader 2 extends the rod 47 by driving the hydraulic cylinder 45 as shown in FIGS. 2 and 5, the support arm 44 uses the pin P on the coupling tool 42 B side as a fulcrum and a predetermined inclination angle via the extension arm 49. Only launched. In this process, the lower mounting base (rod sphere 35) of each stay 3 is slid rearward by a predetermined distance along the guide groove 53 a of the guide rail 53 via the bearing 6, and the wire 8 moves the winch 14. It is rolled up to such an extent that it can be supported.

  In the second step, the reader 2 is raised to the vertical state of FIG. In this process, the lower mounting base (rod sphere 35) of each stay 3 is slid onto the rearmost guide plate 55 constituting the guide rail 53 via the bearing 6. The lower mounting base (rod sphere 35) of each stay 3 is fixed to the fixing plate 56 by an insertion operation into the pin hole 56a of the pin 5, the through hole of the main body 60, and the pin hole 56a. As a result, the reader 2 is stably supported by the two stays 3 while being erected by the wire 8.

  Thereafter, the balance 71 is moved forward so that the rod 71 of the hydraulic cylinder 7 is inserted into the cylinder 70, and the load balance between the front and rear of the base machine 1 including the stage 15 in the vertical state is achieved. Try to keep. Further, in the auxiliary means 4, the pad 43 is released from the fitting to the guide rail 21 by rotating the movable parts on both sides outward as described above. Further, the support arm 44 is switched to the set state of FIG. 1 by the hydraulic cylinder 45 with the rod 47 immersed in the cylinder 46. After that, the connecting member 40 is disconnected from the base machine 1 and moved to a place where it does not interfere with the construction.

  When the leader 2 is tilted again to the ground surface side, first, the restraint on the lower end side of each stay 3 is released by removing the above-described pin 5 so that it can slide along the guide rail 53 via the bearing 6. Next, the auxiliary means 4 is set to the state shown in FIG. 2 by the above-described operation, and then the wire 8 is fed out to tilt the reader 2 forward. Then, the reader 2 is received by the pad 43 provided on the support arm 44. Furthermore, when the hydraulic cylinder 45 immerses the rod 47 in the cylinder 46, the reader 2 is switched to the set state shown in FIG. At that time, by causing the rod 71 of the hydraulic cylinder 7 to protrude as the tilt angle of the reader 2 increases, the balance weight 75 is moved rearward to eliminate the uneven distribution of the longitudinal load of the base machine 1 including the stage 15.

  In addition, the above form does not restrict | limit this invention at all. The present invention may be provided with the technical elements specified in claim 1, and the details can be variously changed as necessary. As an example, the elastic member of the present invention has a configuration in which an extension member is joined and integrated with the cylinder 46 of the hydraulic cylinder 45, for example, in order to make the entire size longer, instead of the configuration of only the hydraulic cylinder 45 as in the form. There may be.

1 ... Base machine (10 is the main body, 11 is the caterpillar, 15 is the stage)
2 ... Leader (20 is main body, 21 is guide rail, 26 is pin)
3 ... Stay for support (32 is a hydraulic cylinder, 34 is a rod, 35 is a sphere)
4 ... Auxiliary means for installing reader (41 is installation base, 44 is support arm)
6 ... Bearing (60 is a main body, 63 is a restricting portion, 65 is a supporting portion, 66 is a shaft hole)
5 ... Pin (locking means)
7 ... Hydraulic cylinder (corresponding to driving means, 70 is a cylinder, 71 is a rod)
8 ... Wire for raising the leader 9 ... Frame 43 ... Pad (43a is a clamping piece)
45 ... Hydraulic cylinder (corresponding to a telescopic member, 46 is a cylinder, 47 is a rod)
53 ... Guide rail (53a is guide groove)
55 ... Guide plate part (55a is guide groove)
56 ... Fixing plate (56a is pin hole)
57... Rear stopper (57a is an engaging portion as a positioning portion)

Claims (6)

A base machine and a reader pivotally supported at the tip of the base machine, and a pair of support stays whose upper ends are pivotally supported on the back of the reader and whose lower ends are disposed on both sides of the base machine; In the ground improvement device comprising a leader hoisting wire that is fed from a winch mounted on the base machine and connected at the tip to the upper side of the leader,
Separately from the wire, as an auxiliary means for erection of the leader that raises the leader from the lying down state, an installation base disposed on the ground surface and a lower end portion are rotatably supported by the installation base and provided at the upper end portion The support arm having a pad that is in contact with the front surface of the reader and receives the reader load, and the entire size connecting different ones of both ends to the installation base side and the support arm side can be variably adjusted. An elastic member,
A ground improvement device, wherein the leader is raised from a lying state via the support arm by lengthening the entire length of the elastic member. 2. The ground improvement device according to claim 1, wherein the elastic member is configured only by a hydraulic cylinder that protrudes and retracts a rod from the cylinder, or has the hydraulic cylinder in a part in a longitudinal direction. .   The ground improvement device according to claim 1 or 2, wherein the elastic members are juxtaposed on both left and right sides of the support arm via overhanging arms.   The ground improvement device according to any one of claims 1 to 3, wherein the installation base is connected to a front side of the base machine.   It has guide rails arranged on both sides of the base machine in the longitudinal direction of the base machine, the lower end of the stay is slidably supported by the guide rail, and can be fixed to the rear side of the guide rail by locking means The ground improvement device according to any one of claims 1 to 4, wherein:   A first step of switching the leader from a lying state to a predetermined inclination angle in the middle of standing by the auxiliary means using the ground improvement device according to any one of claims 1 to 5, and the predetermined inclination by the undulating wire. A method for raising and lowering the leader of the ground improvement device, wherein the second step of switching from a corner to a vertical state is performed.

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