JP2012225009A - Ground improvement device and leader rising/falling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable quick rising/falling work of a leader by using leader erection assisting means which is simpler than an auxiliary heavy machine and can be installed at an uninhibited site.SOLUTION: The ground improvement device comprises: a leader 2 pivotally supported at the front end of a base machine in a tiltable manner; a pair of supporting stays 3 having upper ends pivotally supported on the back of the leader and lower ends disposed on both sides of the base machine, respectively; and a wire 8 delivered from a winch 14 on the side of the base machine and connected at its front end to the upper side of the leader. Herein, as leader erection assisting means 5 in addition to the wire 8 for the leader to rise from the falling condition, there are provided a sliding body 9 which is controlled to be moved along the leader 2, a base member 40 on the side of a ground surface side, and an expansion member 46 connected at one end to the side of the base member and at the other end to the side of the sliding body, and totally variable and adjustable. When the expansion member 46 is set to be totally longer, the leader 2 can rise from the falling condition up to the partially rising condition and also rise via the sliding body more highly from the partially rising condition.

Description

  The present invention relates to a ground improvement device and a method for raising and lowering a leader, in addition to a leader raising and lowering wire, which enables the leader to stand up 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 device of FIG. 9 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. 10 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. 9, 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, a work for attaching / 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 is 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 make it possible for the ground improvement device to perform the raising / lowering operation of the leader as quickly as possible by the auxiliary means for erection of the leader which is simpler than the above-described auxiliary heavy machine and is not subject to the restriction of the installation location. 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, a base member 40 disposed on the ground surface side as the leader erection auxiliary means 5 for raising the leader from the lying down state separately from the wire 8, and the reader 2 Stretchable body 9 or 9A that is controlled to move along, and the base member side and the sliding body side that are differently connected at both ends to each other so as to be pivotable. The leader 2 can be raised from a lying state to the middle of standing by making the entire length of the expansion / contraction member 46 longer, and can be further raised from the middle of standing through the sliding body. It is characterized by that. The present invention as described above is more preferably embodied as follows.

(A) The sliding body 9 has a lifting and lowering means that is moved up and down via a pinion mechanism that rotates while meshing with a rack provided in the longitudinal direction of the reader 2 (Claim 2). ).
(A) The sliding body 9A is disposed along the guide rail 21 and the lower metal fitting 93 that is fitted to the guide rail 21 provided in the longitudinal direction of the reader 2 and connected to the upper end of the telescopic member 46. The hydraulic cylinder 95 having one end connected to the lower metal fitting 93 and the upper metal fitting 94 that is fitted to the guide rail 21 and connected to the other end of the hydraulic cylinder 95 can be fixed. (Claim 3).

(C) The base member 40 is connected to 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, The configuration includes 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 the sliding body (Claim 6).

  In the invention of claim 1, the auxiliary means is connected to the sliding body whose movement is controlled along the leader as illustrated in FIG. 1, the base member disposed on the ground surface side, and one of them having different end portions connected thereto. Therefore, the reader can be raised and lowered more easily and easily than the conventional auxiliary heavy machinery for lifting the leader. 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, versatility is obtained because the sliding body is a well-known lifting means comprising a rack and pinion mechanism.

  In the invention of claim 3, it is significant that the sliding body is constituted by upper and lower metal fittings and a hydraulic cylinder as exemplified in FIG. 7, and is not limited to the structure of claim 2.

  In the invention of claim 4, since the base member is connected to the front side of the base machine, the load or stress applied to the base member as shown in FIG. 4B can be received as the reaction force of the base machine, and the auxiliary means is provided. 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. (A), (b) is a schematic side view which shows the action | operation of the said auxiliary | assistant means. (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, (c) is the figure which fitted the bearing to the guide rail. (A), (b) is a schematic side view showing the member relationship of the auxiliary means in a state where the reader is raised at a predetermined inclination angle by the auxiliary means and another example of the auxiliary means, and the reader is switched to the vertical state. It is a model side view. (A), (b) is a schematic side view and schematic rear view showing a lower metal fitting, a hydraulic cylinder, and an upper metal fitting, (c) is a schematic view of the lower metal fitting viewed from above, and (d) the upper metal fitting is viewed from above. It is a schematic diagram. (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 clarifying the device structure of the present invention, reference will be made to usage or operation and modifications. 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. 9 are used for the same parts, and only different parts or newly added members are assigned 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 24 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. 5, the main frame 10 includes a cockpit disposed on one side of the front, a support portion 13 projecting from the left and right intermediate portions of the front edge, two winches 14 and a frame 12 provided in a substantially central portion, A stage 15 or the like coupled 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 the suspension rope R constituting the lifting means as in the modification of FIG. A driving device 17 such as an air tank, a compressor, or a motor is mounted on the upper surface of the stage 15. 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 leader 2 includes a guide rail 21 provided on the front surface and extending in the vertical direction on both sides, a rack (not shown) provided between the guide rails 21 provided in the vertical direction, and a bracket for stays provided on the upper back side. 24, 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. 6, 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. 6 (c) and 6 (e).

  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, as shown in FIG. 4, the auxiliary means 4 has a base member 40 disposed on the ground surface side, a sliding body 9 that is controlled to move along the reader 2, and a base member 40 side that slides. The movable body 9 is provided with an expansion / contraction member 46 that can be variably adjusted in all dimensions, and is connected to one end of the moving body 9 so as to be rotatable.

  Among these members, the base member 40 is a member that receives a load or stress received from the reader 2, and includes a coupling tool 40 a that projects from one end disposed on the base machine side, and a member that is disposed on the side away from the base machine 1. It has a pair of sandwiching pieces 40b projecting at the end and a pair of joint portions 41a projecting at a location close to the connector 40a.

  The above base member 40 is connected to the pair of sandwiching pieces 18 in which the connecting tool 40a is welded to the lower frame portion on the base machine side by fastening means such as pins with respect to the base machine 1, and each joint portion 41a. Are coupled to a corresponding connector 41b provided on the support portion 13 side by fastening means such as a bolt. As a result, in this structure, the stress in the X direction of FIG. 4B applied to the base member 40 can be received by the weight of the base machine 1, and the base member 40 can be prevented from moving in the same direction. 41a and the coupling tool 41b function as a fulcrum that prevents the front machine machine from tipping over due to the unbalanced load of the reader 2.

  The sliding body 9 is a pinion mechanism that is rotated while the main body 90 is engaged with a rack (not shown) provided in the longitudinal direction of the reader 2 as disclosed in Japanese Patent No. 2584402 and Japanese Patent Application Laid-Open No. 2003-206531. There is a known lifting means that is moved up and down by remote control via The main body 90 is equipped with a fitting portion (also referred to as a guide give) 91 that fits into the guide rail 21, a pinion that meshes with the rack, a motor that drives the pinion via a speed reducer, and the like. A pair of sandwiching pieces 92 is provided.

  The telescopic member 46 includes an extension arm 42 pivotally supported by a pair of sandwiching pieces 40b on the base member side, and a hydraulic cylinder 46 interposed between the extension arm 42 and the sandwiching piece 92. One end 42a of the extension arm 42 is rotatably connected to the pair of holding pieces 40b via a pin P or the like. The hydraulic cylinder 43 includes a cylinder 44 and a rod 45. The cylinder mounting end 44a is coupled and integrated with the other end 42b of the extension arm. The rod attachment end 45a is rotatably connected to the pair of holding pieces 92 via a pin P or the like.

(Operation) In the above-described leader raising method using the ground improvement device, the leader 2 has a predetermined inclination angle in the middle of standing from the lying down state by lengthening the entire length of the elastic member 46 constituting the auxiliary means 4. Alternatively, on the contrary, the first step of switching from the predetermined inclination angle to the lying down state, and the sliding body 6 constituting the auxiliary means 4, the vertical inclination from the predetermined inclination angle or the opposite from the vertical state to the predetermined inclination angle. The second step of switching to is performed.

  In the first step, the leader 2 is first supported at the lower end side by a pin 26 or the like on the support portion 13 of the base machine 1 as shown in FIG. Next, the constituent members of the auxiliary means 4, that is, the telescopic member 46 composed of the base member 40, the sliding body 9, the extension arm 42, and the hydraulic cylinder 43 are set in the corresponding portions as shown in FIG. 40 is coupled to the base machine 1. As another preparatory operation, as shown in FIG. 1, the lower mounting base (the sphere 35 of the rod 34) on each stay is fitted into the guide groove 53 a of the slide rail 53 via the bearing 6.

  Thereafter, in terms of procedure, the rod 45 is extended by driving the hydraulic cylinder 43 from the state in which the sliding body 9 is fixed as shown in FIGS. Then, in the reader 2, the elastic member 46 is rotated about the pin P at the one end 42 a described above due to the stress generated between the reader 9 and the predetermined pin 26 at the base end of the reader as a fulcrum. Only the tilt angle can be 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.

  In the second step, in order to raise the reader 2 to the vertical state of FIG. 3, the sliding body 9 constituting the auxiliary means 4 is moved downward. During the start-up process of the leader 2, 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. Thereby, the leader 2 is stably supported by the two stays 3 so as to avoid the overturn in the front-rear direction.

  Thereafter, when the rod 45 is immersed in the cylinder 44 from the state in which the sliding body 9 is released from being fixed to the leader side latch, the sliding body 9 is moved downward in accordance with the amount of immersion of the rod 45. . Thereafter, the pin P of the rod 45 is pulled out at a relatively low position to release the connection of the rod mounting end 45a to the holding piece 92 on the sliding body side, and then the base member 40 is disconnected from the base machine 1 and the entire construction is performed. Move to a place where it will not get in the way.

  When the leader 2 is tilted again to the ground surface, the reverse operation described above is performed. As an example, by removing the pin 5 described above, the restraint on the lower end side of each stay 3 is released so that it can slide along the guide rail 53 via the bearing 6. Next, the auxiliary means 4 is moved upward while the rod 9 of the hydraulic cylinder 43 protrudes from the cylinder 44 after the slider 9 is set to the solid line state of FIG. The Then, the reader 2 is tilted forward and held by the auxiliary means 4, and further, when the hydraulic cylinder 43 immerses the rod 45 in the cylinder 44, the leader 2 is switched to the set state of FIG.

(Modification) FIG. 7 and FIG. 8 show another configuration example of the sliding body constituting the above ground improvement device. In this description, the same or similar members as those in the above embodiment are given the same reference numerals, and only the changed configuration will be described in detail. That is, the sliding body 9A of the modified example includes a lower metal fitting 93 that is fitted to the guide rail 21 provided in the longitudinal direction of the reader 2 and is connected to the upper end portion of the rod 45 that constitutes the elastic member 46, and the guide A hydraulic cylinder 95 disposed along the rail 21 and having one end connected to the lower metal fitting 93, and a position-fixable upper metal fitting 94 fitted to the guide rail 21 and connected to the other end of the hydraulic cylinder 95. It is composed.

  Among these, the lower metal fitting 93 includes a fitting portion (also referred to as a guide give) that is slidably fitted to the leader side guide rail 21 as shown in FIG. And a piece 93a. The hydraulic cylinder 95 includes a cylinder 96 and a rod 97. The rod attachment end 97a is rotatably connected to the pair of holding pieces 93a via a pin P or the like. The mounting end 96a of the cylinder is integrally joined to the upper metal fitting 94 by bolt joining (not shown). In addition, the attachment end 45a of the rod which comprises the above-mentioned expansion-contraction member 46 is connected with each said clamping part 93a via the pin P etc. so that rotation is possible.

  On the other hand, as shown in FIG. 8 (d), the upper metal fitting 94 is provided at a fitting portion (also referred to as a guide give) that is slidably fitted to the leader side guide rail 21 and at the lower left and right intermediate portions. A connecting portion 94a that is coupled to the end 96a, a suspension fitting 94b that is provided at the upper left and right intermediate portions and to which the tip of the suspension rope R described above is connected, and is provided at a substantially central portion and is mounted in the cylinder. It has a hydraulic cylinder 98 and a lock pin 99 provided at the tip of a rod that constitutes the hydraulic cylinder 98 and protrudes and retracts with respect to the cylinder.

  In the above structure, in the first step, the leader 2 is first supported at the lower end side by the pins 26 and the like on the base machine support portion 13 as in FIG. The Next, the constituent members of the auxiliary means 4, that is, the base member 40, the sliding body 9 </ b> A, and the expansion / contraction member 46 are set in corresponding portions, and the base member 40 is coupled to the base machine 1. Here, in the case of this sliding body 9A, compared with the above sliding body 9, the rod of the hydraulic cylinder 98 is in the collapsed state in this figure (in this collapsed state, the leader 2 has fallen in the same manner as in FIG. 4A). To the collision state. Then, the sliding body 9A is engaged with a locking hole provided in a lock receiving plate (not shown) provided on the corresponding side surface of the reader 2 by projecting the lock pin 99, thereby the reader 2 as shown in FIG. The position is fixed with respect to.

  Thereafter, the hydraulic cylinder 43 is driven to extend the rod 45 from a state in which the sliding body 9A is fixed via the lock pin 99. Then, in the reader 2, the elastic member 46 is rotated about the pin P at the one end 42 a described above due to the stress generated between the reader 9 </ b> A. It is raised by a predetermined inclination angle of 7 (a). 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 53a of the guide rail 53 via the bearing 6, in the same manner as described above. The suspension rope R is wound up so as not to bend through the winch 14.

  In the second step, as a method for raising the reader 2 to the vertical state of FIG. 3, the reader 2 is raised via the sliding body 9 </ b> A constituting the auxiliary means 4. Instead of this, it is also possible to adopt a configuration in which it rises through the wire 8 as in the prior art, or a configuration in which it rises by both the sliding body 9A and the wire 8.

  In the sliding body 9A of the modified example, for example, when the hydraulic cylinder 95 is driven and the rod 97 is protruded, the lower fitting 93 is moved downward with respect to the upper fitting 94 as shown in FIG. For this reason, in the dismantling operation, the pin P of the rod 45 with respect to the lower metal fitting 93 is pulled out at a relatively low position, and the expansion member 46 and the base member 40 constituting the auxiliary means 4 are separated from the base machine 1 as in the above embodiment. , Move the whole to a place that does not interfere with the construction. At the same time, the sliding body 9A is moved downward via the suspension rope R after the lock pin 99 is unlocked, and removed from the reader 2 by an operation from the ground surface side.

  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 expansion / contraction member of the present invention is not limited to the configuration of the extension arm 42 and the hydraulic cylinder 43 as in the form, but can be configured only by a hydraulic cylinder having a full length.

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 building leader (40 is base member, 42 is extension 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 ... Still 8 ... Wire for raising / lowering the leader 9 ... Sliding body (90 is the main body, 91 is the fitting part, 92 is the clamping piece)
9A ... Sliding body (93 is a lower bracket, 95 is a hydraulic cylinder, 94 is an upper bracket)
93 ... Lower metal fitting 53 ... Guide rail (53a is a guide groove)
55 ... Guide plate part (55a is guide groove)
98 ... Hydraulic cylinder 99 ... Lock pin

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 a leader erection auxiliary means for raising the leader from a lying state, a sliding body controlled to move along the leader, a base member disposed on the ground surface side, and the base member side And an expansion / contraction member capable of variably adjusting the entire dimension, each of which is connected to the sliding body side so as to be rotatable at both ends.
The leader can be raised from a lying state to the middle of standing by lengthening the entire length of the telescopic member, and can be further raised from the middle of standing through the sliding body. Ground improvement construction equipment.   2. The ground according to claim 1, wherein the sliding body has lifting means that is moved up and down via a pinion mechanism that rotates while meshing with a rack provided in a longitudinal direction of the leader. Improved device.   The sliding body is fitted to a guide rail provided in the longitudinal direction of the leader, and a lower metal fitting that connects an upper end portion of the telescopic member, and an end portion arranged along the guide rail to the lower metal fitting. The ground improvement device according to claim 1, comprising: a connected hydraulic cylinder; and a position-fixable upper metal fitting that is fitted to the guide rail and connected to the other end of the hydraulic cylinder.   The ground improvement device according to any one of claims 1 to 4, wherein the base member is connected to 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 5, wherein   Using the ground improvement device according to any one of claims 1 to 5, a first step of switching the leader from a lying state to a predetermined inclination angle in the middle of standing by an elastic member constituting the auxiliary means, A method for raising and lowering the leader of the ground improvement construction apparatus, wherein the second step of switching from the predetermined inclination angle to the vertical state by the sliding body is performed.

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