JP6410294B2 - Telescopic construction leader - Google Patents

Description

  The present invention relates to a telescopic construction leader with adjustable height, which supports a ground improvement device such as a hollow tube.

  As a ground improvement device used for improvement of soft ground, for example, a deep mixed processing pile device (Japanese Patent Laid-Open No. 2002-235321), a sand pile building device (Japanese Patent Laid-Open No. 8-284146) or a prefabricated vertical drain building device ( JP, 2000-160544, A) etc. are known. As shown in FIG. 12, these ground improvement devices use a construction leader 101 that supports the rod and the hollow tube 102 deeply in the ground to support it on the ground. The construction leader 101 in FIG. 12 is a round post leader, the reference numeral 103 is a convex engagement guide portion formed in the construction leader 101 and extending in the longitudinal direction, and the reference numeral 104 is attached to the ground improvement device. It is a concave engagement guide portion that engages with the engagement guide portion 103. The rod and the hollow tube 102 move up and down while being supported by the construction leader 101 to improve the ground.

  On the other hand, when the ground improvement is performed in a place where there is a restriction on the airspace such as around the airport that cannot be constructed with the normal height of the ground improvement device, the height of the construction leader needs to be less than the restriction height. In order to solve this problem, Japanese Patent Application Laid-Open No. 9-41355 discloses a telescopic leader having an inner / outer double structure equipped with a pin roller jack-up device. With this reader, a long reader can be easily shortened and can be used in places with height restrictions.

Japanese Patent Laying-Open No. 2005-177886 (Claim 1, paragraph 0001) Japanese Patent Laid-Open No. 9-41355 (Claim 1)

  However, in the case of a double tube structure reader described in Japanese Patent Application Laid-Open No. 9-41355, a convex or concave long engagement guide portion for guiding the ground improvement device cannot be formed on the side surface of the leader, and at most a wire There is a problem that the use of the top sheave provided with the pulley over which the vehicle can be mounted is limited.

  On the other hand, Japanese Patent Application Laid-Open No. 2005-177886 discloses a plurality of block connecting bodies composed of a plurality of unit blocks that are sequentially connected by a connecting member, and a tip coupling block that joins the tips of the block connecting bodies. Each of the block connecting bodies includes a winding drum and a drum driving means for driving the winding drum, and each of the block connecting bodies includes a connecting surface LF on which the connecting member is provided, and the connecting surface. There is a non-connecting surface NLF on which no connecting member is provided, and when the block connecting body is fed out from the winding drum, the non-connecting surface NLF of the block connecting body comes into contact with each other. An expansion / contraction mechanism characterized in that a drum is disposed is disclosed. This expansion / contraction mechanism is suitable as a leg for a robot.

  However, in the telescopic mechanism described in Japanese Patent Application Laid-Open No. 2005-177886, the extension of the block connecting body is downward, and the upward extension is unexpected, and the application to the construction leader guiding the ground improvement device is not possible. It was impossible.

  Accordingly, an object of the present invention is to provide a telescopic construction leader that can be adjusted in height and can employ various engagement guide portions for guiding the ground improvement device.

  In other words, the present invention solves the above-described conventional problems, and is formed by first and second unit link member connections formed by sequentially connecting a plurality of unit link members in a rotatable manner using a connection member. A body, a distal end coupling portion for coupling the respective distal ends of the first and second unit link member coupling bodies, and first and second rotating bodies for winding or sending the first and second unit link member coupling bodies, respectively. An engagement guide portion for guiding the ground improvement device formed in the first and second unit link member coupling body or the tip coupling portion, and a rotating body driving means for driving the rotating body, And the second unit link member connecting body has a connecting surface on which the connecting member is formed and a non-connecting surface on which the connecting member on the opposite side of the connecting surface is not formed, and is fed from the rotating body. The first and second unit link portions The non-connecting surfaces of the connecting body contact each other to form a leader, and the plurality of unit link members are rotatably connected to the connecting surface side with the connecting member as an axis. It provides a stretchable construction leader.

  According to the stretchable construction leader of the present invention, the height of the leader can be adjusted by rotating the rotating body. For this reason, when the restricted height changes around the airport, the leader height and the ground improvement device height can be adjusted to the restricted height at any time, so that the construction can be efficiently performed even in the restricted height area. Moreover, since it is not the expansion-contraction structure by a double pipe, since the various engagement guide parts which guide the ground improvement apparatus extended in the longitudinal direction of a leader outer peripheral surface can be taken, a use application spreads.

It is a front view of the expansion-contraction construction leader in embodiment of this invention. It is a perspective view of the expansion-contraction construction leader of FIG. FIG. 2 is a simplified diagram of a unit link and a unit link member coupling body used in the extension work leader of FIG. 1. It is a simplified sectional view of a leader in another extension construction leader. It is a simplified sectional view of a leader in another extension construction leader. It is a simplified sectional view of a leader in another extension construction leader. It is a front view of the expansion-contraction construction leader in other embodiment of this invention. It is a front view of the expansion-contraction construction leader in other embodiment of this invention. (A) is the fragmentary perspective view of the expansion-contraction construction leader in other embodiment of this invention, (B) is a part unit link member coupling body seen from the X direction of (A). (A) is the front view of the ground improvement machine using the expansion construction leader of FIG. 1, (B) is the side view which abbreviate | omitted a part of (A). In FIG. 10, it is a front view of the ground improvement machine with high leader height, (B) is the side view which abbreviate | omitted a part of (A). It is a simplified top view of the conventional reader.

  Next, the telescopic construction leader in the embodiment of the present invention will be described with reference to FIGS. 1 to 3, 10 and 11. The extension construction leader 10 includes a first unit link member coupling body 1A and a second unit link member coupling body 1B (hereinafter also simply referred to as “unit link member coupling body”), and the first and second unit link member coupling bodies. A distal end coupling portion 2 for coupling the respective distal ends of the bodies 1A and 1B, a first rotating body 3a and a second rotating body 3b for winding or sending the unit link member coupling bodies 1A and 1B, respectively, and a one unit link member coupling body; Engagement guide portion 4a for guiding ground improvement device 60 formed in 1A and second unit link member coupling body 1B or tip coupling portion 2, and rotating body driving means for driving first and second rotating bodies 3a and 3b 40 (not shown in FIGS. 1 to 3).

  The first unit link member connection body 1A is formed by sequentially connecting a plurality of unit link members 11a, 11a,. The unit link member 11a of this example forms a short hollow tube when the inner openings of each other are abutted with each other. In this example, a rectangular first side plate 111a having a connecting surface 6 as a side surface and The first side plate 111a has a U-shaped cross-section composed of a rectangular second side plate 112a and a third side plate 113a having side surfaces parallel to the winding or feeding direction bent at right angles from both ends of the first side plate 111a. That is, the openings inside each other are openings on the opposite side (opposite side) of the first side plate 111a, and do not refer to openings in the direction of winding or feeding. In addition, a short hollow tube is distinguished from the leader 7 which consists of a long hollow tube formed with unit link member coupling body 1A, 1B, and is short compared with a long hollow tube. Say there is.

  The plurality of unit link members 11a are connected on the first side plate 111a side, and are not connected on the opening side opposite to the first side plate 111a (opposite side). That is, the plurality of unit link members 11a are rotatably connected to the connecting surface 6 with the connecting member 12a as an axis, and can be wound around the rotating bodies 3a and 3b. The unit link member 11a does not bend to the non-connecting surface 5 side where the connecting member 12a that is the surface opposite to the connecting surface 6 is not formed.

  In this example, the non-connecting surface 5 of the unit link member 11a is an end surface of the second side plate 112a and the third side plate 113a on the side opposite to the first side plate 111a, and the thickness and winding of the second side plate 112a and the third side plate 113a. Or it is a surface which makes the length in the sending-out direction vertical and horizontal, and is smaller than the connection surface 6 in area comparison.

  The connecting member 12a is a hinge member, and examples thereof include a hinge and a pin. When the connecting member 12a connects a plurality of unit link members 11a, the connecting unit 12a is an inner connection in which the connecting portion does not protrude from the connecting surface 6. When the connecting member 12a is wound around the rotating body 3a, the first unit link member The contact between the connecting body 1A and the rotating body 3a is a surface contact, which is preferable in that the engagement between the third engagement portion 32a that is a drive protrusion and the fourth engagement portion 115a that is a drive recess is ensured.

  A convex first engaging portion 114a, which is an optional component, is formed on the non-connecting surface 5 of the unit link member 11a. Thereby, the 1st engaging part 114a forms the columnar leader 7 reliably by engaging with the concave 2nd engaging part 114b formed in the non-connecting surface 5 of the other unit link member 11b. be able to.

  Moreover, the concave 4th engaging part 115a engaged with the 3rd engaging part 32a of the rotary body 3a is formed in the connection surface 6 of the unit link member 11a. The formation position of the fourth engagement portion 115a on the connecting surface 6 is an end in the direction orthogonal to the winding or feeding direction, that is, a position corresponding to the second side plate 112a and the third side plate 113a. It is preferable in that it can be formed. If the fourth engagement portion 115a is a deep hole, the engagement of the rotating body 3a with the protruding third engagement portion 32a is ensured and stable. If the unit link member 11a is a solid block body, a deep hole can be formed even if the concave fourth engaging portion 115a is the central portion of the connecting surface 6.

  The other unit link member 11b and the second unit link member linked body 1B are substantially the same as the unit link member 11a and the first unit link member linked body 1A, and different points will be described. That is, in the unit link member 11b and the second unit link member coupling body 1B of this example, the difference from the unit link member 11a and the first unit link member coupling body 1A is that it is bilaterally symmetric about the leader axis. A concave second engagement portion 114b that engages with the first engagement portion 114a is formed at a position facing the convex first engagement portion 114a on the non-connecting surface 5 of the unit link member 11a. As a result, the unit link member 11a and the unit link member 11b fed from the rotating bodies 3a and 3b synchronously at a constant speed are engaged with each other, and the first unit link member connecting body 1A and the second unit link member are connected. The non-connecting surface 5 of the body 1 </ b> B comes into contact to form a columnar leader 7. The leader 7 is sent out and extends upward.

  The unit link members 11a and 11b of the telescopic construction leader 10 have the above-mentioned U-shaped cross-sectional shape, and the formed hollow tube is not limited to a rectangular one. For example, a hollow formed by abutting the openings inside each other. As the tube shape, the cross-sectional shape may be polygonal, elliptical, circular, or the like. In this case, the contact surfaces of the unit link members 11a and 11b of the rotators 3a and 3b may be shaped so as to be surface-surface contact. Further, the unit link members 11a and 11b are not limited to those forming a hollow tube, and may be solid block bodies. Further, in the unit link members 11a and 11b of the telescopic construction leader 10, the first engagement portion 114a and the second engagement portion 114b are not limited to the engagement of the above-described unevenness, and various engagements other than the unevenness can be applied. . Further, the first engaging portion 114a and the second engaging portion 114b may not be provided.

  The telescopic construction leader 10 has a tip coupling portion 2 that couples the tips of the unit link member coupling bodies 1A and 1B. By having the tip coupling portion 2, the unit link member coupling bodies 1 </ b> A and 1 </ b> B that have been unwound can form a columnar leader 7 without leaving each other.

  The telescopic construction leader 10 includes first and second rotating bodies 3a and 3b that wind or send the unit link member coupling bodies 1A and 1B, respectively. The first and second rotating bodies 3a and 3b are the same, and in this example, each side is a polygonal drum having a side corresponding to the length of the first side plate 111a of the unit link member 11a. is there. On the surfaces of the first and second rotating bodies 3a and 3b, a projecting third engagement that engages with the concave fourth engaging portions 115a and 115b formed on the connecting surface 6 of the unit link members 11a and 11b. The joining portions 32a and 32b are formed, and the unit link members 11a and 11b are hooked on the projecting third engaging portions 32a and 32b to wind and send out the unit link member coupling bodies 1A and 1B. The first and second rotating bodies 3a and 3b have third engaging portions 32a and 32b that engage with the unit link members 11a and 11b, respectively, that wind or send out. In this example, two places are formed in the vicinity of both side ends of one surface constituting the polygon. Further, in the unit link member coupling bodies 1A and 1B, the unit link members 11a and 11b at the distal end on the rotating body side are fixed to the first and second rotating bodies 3a and 3b. Thereby, even if the unit link members 11a and 11b at the front end on the rotating body side are located directly below the first and second rotating bodies 3a and 3b, they do not come off the drooping body and hang down. In addition, the shape of the 1st and 2nd rotary bodies 3a and 3b is not limited to the said polygon, Various shapes according to the shape of the unit link members 11a and 11b can be taken. The first and second rotating bodies 3a and 3b are wound and sent out at a constant speed in synchronization with each other.

  In the telescopic construction leader 10, the first and second rotating bodies 3a, 3b are arranged so that the non-connecting surfaces of the unit link member connecting bodies 1A, 1B fed out from them substantially come into contact with each other. In this example, it further includes crimping means 8a and 8b which are sandwiched from both sides so that the non-connecting surfaces 5 of the unit link member connecting bodies 1A and 1B sent out from the first and second rotating bodies 3a and 3b come into contact with each other. As a result, the non-connecting surfaces of the unit link member connecting bodies 1A and 1B sent out from the first and second rotating bodies 3a and 3b abut reliably. Examples of the pressure bonding means 8a and 8b include rollers. That is, it is preferable that the unit link member coupling bodies 1A and 1B are sandwiched from both sides and rotated by themselves so that frictional heat is not generated and no abnormal noise is generated.

  In the telescopic construction leader 10, the first and second rotating bodies 3 a and 3 b and the crimping means 8 a and 8 b are attached to the support base 19. The support base 19 has front and rear side plates and a bottom plate, and the front and rear side plates support the rotation shafts 33a and 33b of the first and second rotating bodies 3a and 3b and the rotation shafts 81a and 81b of the crimping means 8a and 8b. The The upper side of the support base 19 is an opening, so that the unit link member coupling bodies 1A and 1B can be fed and taken up freely. The support base 19 is installed on a crane or the like, for example (see FIG. 10B).

  The telescopic construction leader 10 has an engagement guide portion 4a that guides the ground improvement device 60 formed in the unit link member coupling bodies 1A, 1B or the tip coupling portion 2. 1 is a top sheave having a pulley 41 attached to the distal end of the distal end coupling portion 2. According to the top sheave 4a, a ground improvement device 60 such as a sand pile forming hollow pipe is suspended by the rope 46 and guided.

  The engagement guide portion 4 a is not limited to the top sheave, and is, for example, a convex member having a circular cross section, an elliptical cross section, or a U-shaped cross section extending in the longitudinal direction of the leader 7, or a concave groove extending in the longitudinal direction of the leader 7. Etc. The engagement guide portion 4b of FIG. 4 includes convex members 42a and 42b having a circular cross section attached to one side surface 72 orthogonal to the connecting surface 6 or the non-connecting surface 5 of the leader 7 extending in the longitudinal direction of the leader 7. It consists of a plate-like connecting member 421 interposed between the convex members 42 a and 42 b and the leader 7. The engagement guide portion 4b is formed on each of the plurality of unit link members, and becomes a member that extends long in the longitudinal direction of the leader 7 when the unit link member coupling bodies 1A and 1B are formed. The concave portions of the ground improvement device 60 are engaged with the convex members 42a and 42b. In addition to being attached to one side 72, the engagement guide 4b may be formed on the other side of the opposite side. Since the engagement guide part 4b is not attached to the connecting surface 6 of the leader 7, there is no problem even if it is wound around the rotary bodies 3a and 3b. In this case, a gap larger than the protrusion of the engagement guide portion 4 b through which the engagement guide portion 4 b passes is formed between the side plates of the leader 7 and the support base 19. The convex members 42a and 42b of the engagement guide portion 4b may have an elliptical cross-sectional shape.

  5 is concave grooves 43a and 43b attached to one side surface 72 orthogonal to the connecting surface 6 or the non-connecting surface 5 of the leader 7 extending in the longitudinal direction of the leader 7. As shown in FIG. The engagement guide portion 4c is formed in each of the plurality of unit link members, and becomes a groove extending long in the longitudinal direction of the leader 7 when the unit link member coupling bodies 1A and 1B are formed. The convex members of the ground improvement device 60 are engaged with the concave grooves 43a and 43b. In addition to being attached to one side surface 71, the engagement guide portion 4c may be formed on the other side surface on the opposite side. The concave grooves 43a and 43b in FIG. 5 have a trapezoidal cross-sectional shape in which the groove side wall gradually decreases toward the opening side.

  6 is a channel-like (U-shaped cross-section) convex member 44a, 44b attached to an edge (end) of the connecting surface 6 of the leader 7 extending in the longitudinal direction of the leader 7. is there. The engagement guide portion 4d is formed in each of the plurality of unit link members, and becomes a member that extends long in the longitudinal direction of the leader 7 when the unit link member coupling bodies 1A and 1B are formed. The engaging portions of the ground improvement device 60 are engaged with the convex members 44a and 44b. In the case of the engagement guide portion 4d, the connecting surface 73 of the leader 7 where the engagement guide portion 4d is not formed is a portion that abuts against the polygonal surfaces of the rotating bodies 3a and 3b. In addition, the convex members 44a and 44b of the engagement guide portion 4d can take various cross-sectional shapes other than the channel shape.

  Further, the engagement guide portion may be a rack (not shown). Examples of such racks include a pair of racks attached to one side surface 72 orthogonal to the connecting surface 6 or the non-connecting surface 5 of the leader 7 extending in the longitudinal direction of the leader 7. The rack is formed in each of the plurality of unit link members. When the unit link member coupling bodies 1A and 1B are formed, the rack extends long in the longitudinal direction of the leader 7 and the rack teeth are directed outward. The pinion of the ground improvement device is engaged with the rack. Thereby, for example, a rack and pinion type casing lifting and lowering device can be configured. Such a casing lifting device can obtain a reaction force from the leader 7 at the time of penetration and at the time of withdrawal.

  The telescopic construction leader 10 includes a rotating body driving means 40 that drives the first and second rotating bodies 3a and 3b. The rotating body driving means 40 may be a known one having a function of starting and stopping the first and second rotating bodies 3a and 3b in synchronization with each other and rotating them at a constant speed, for example, FIG. The hydraulic motor 40 attached to the crane 13 and the well-known means for controlling it can be used.

  Next, an extension construction leader 10a, which is a modification of the extension construction leader 10, will be described with reference to FIG. In the expansion / contraction construction leader 10a, the same components as those of the expansion / contraction construction leader 10 are denoted by the same reference numerals, the description thereof is omitted, and different points are mainly described. In other words, the telescopic construction leader 10a differs from the telescopic construction leader 10 in that the first and second rotating bodies 3a and 3b are brought into contact with the unconnected surfaces of the unit link member coupling bodies 1A and 1B fed from them. And the installation of the crimping device 8 is omitted. That is, the expansion / contraction construction leader 10a also serves as a crimping device. Such an extension construction leader 10a is formed between the rotation shafts 33a and 33b of the first and second rotating bodies 3a and 3b by the diameter of the rotating body and the first and second unit link member coupling bodies 1A and 1B. It can be obtained by adding the outer diameter of the hollow tube. Also in the extension work leader 10a, the columnar leader 7 can be reliably formed by sending out the first and second rotating bodies 3a and 3b.

  Next, an extension construction leader 10b, which is a modification of the extension construction leader 10, will be described with reference to FIG. In the expansion / contraction construction leader 10b, the same components as those of the expansion / contraction construction leader 10 are denoted by the same reference numerals, description thereof is omitted, and different points will be mainly described. That is, in the expansion / contraction construction leader 10b, the difference from the expansion / contraction construction leader 10 is that after winding the first and second rotating bodies 3a and 3b without winding all of the unit link member coupling bodies 1A and 1B, It moves in the horizontal direction (outward direction). That is, support members 9a and 9b extending in the lateral direction on the outer side are formed on the opposite sides of the first and second rotating bodies 3a and 3b. The supporting members 9a and 9b have a mounting surface 91 having a width dimension sufficient to support the unit link member coupling bodies 1A and 1B. Further, the lengths of the support members 9a and 9b are appropriately determined depending on the lengths of the unit link member coupling bodies 1A and 1B and the free space in the lateral region. Further, the mounting surfaces of the support members 9a and 9b may be roller surfaces in order to reduce friction. In the telescopic construction leader 10b, the wound unit link member coupling bodies 1A and 1B are wound about 1/4 by the first and second rotating bodies 3a and 3b, and then the placement surfaces of the support members 9a and 9b. Move while sliding on 91. In the unit link member link 1A, the first engaging portion 114a formed on the unit link member 11a is located on the mounting surface 91 side of the support members 9a and 9b, but a large load or load is not applied. There is no. The telescopic construction leader 10b is effective when there is no restriction in the lateral region.

  Next, the telescopic construction leader 10c will be described with reference to FIG. In the expansion / contraction construction leader 10c, the same components as those of the expansion / contraction construction leader 10 are denoted by the same reference numerals, description thereof will be omitted, and different points will be mainly described. That is, the extension construction leader 10c is different from the extension construction leader 10 in that the unit link member coupling bodies 1A and 1B are spirally wound around the first and second rotating bodies 3a and 3b. That is, the first and second rotating bodies 3a and 3b have a depth width that allows spiral winding, and the surface of the rotating bodies 3a and 3b has a protruding third engaging portion at a location corresponding to the spiral shape. 32a and 32b are formed. The unit link members 11a and 11b are inclined at angles of two unit link members 11a and 11a to be connected and two unit link members 11b and 11b to be connected so that the unit link member connections 1A and 1B are spirally wound. They are linked by α. When the engagement guide portion is the engagement guide portion 4a attached to one side surface 72 orthogonal to the connection surface 6 or the non-connection surface 5 of the leader 7 as shown in FIG. Thus, the problem of obstacles caused by spiral winding can be solved.

  As a method of connecting two unit link members to be connected at an inclination angle α, for example, as shown in FIG. 9B, in the first unit link member connecting body 1A, the unit link member as viewed from the non-connecting surface 5 11a may be inclined at an angle α in the direction in which the abutting surface 116a of the unit link member 11a to be coupled is spirally wound (inclined to the right in FIG. 9B). Thereby, 1A of 1st unit link member coupling bodies are wound in the 1st rotary body 3a by the inclination (alpha). According to the telescopic construction leader 10c, it is effective when there is a limitation in the lateral region.

  Next, the ground improvement machine 50 using the expansion and contraction construction leader 10 of the present invention will be described with reference to FIGS. 10 and 11. FIG. 10 is a diagram for explaining a construction method of the ground improvement machine 50 in a place with a height restriction. The ground improvement machine 50 includes the extension work leader 10 and a ground improvement device 60a. That is, the telescopic construction leader 10 is mounted on the crane 13, and most of the unit link member coupling bodies 1 </ b> A, 1 </ b> B are wound around the rotary bodies 3 a, 3 b, and the leader 7 has a low height. . A rope 46 is hung on the pulley of the top sheave 4a at the tip of the leader 7. One end of the rope 46 is wound around the winch of the crane 13, and the other end of the rope 46 is the hollow tube 60a. It is fixed to the upper end (FIG. 10). Thus, the extension work leader 7 can perform ground improvement at a height of the leader 7 that matches the restriction height of the ground improvement device 60 in a place where there is a height restriction.

  FIG. 11 is a diagram for explaining a construction method of the ground improvement machine 50 in a place where there is no height restriction. The telescopic construction leader 7 increases the leader height from the state shown in FIG. That is, the rotating bodies 3a and 3b are rotated in the direction in which the unit link member coupling bodies 1A and 1B are sent out. Thereby, unit link member coupling body 1A, 1B sent out forms non-connecting surfaces 5 and a leader 7 with high height (FIG. 11). Thus, the expansion / contraction construction leader 7 can perform ground improvement using the ground improvement device 60b having a high height in a place where there is no height restriction.

  Next, when the construction is completed and the stretchable ground improvement machine 50 is put in the garage, the stretchable construction leader 7 is changed from the height of FIG. 11 to the height of FIG. That is, the rotating bodies 3a and 3b are rotated in the direction in which the unit link member coupling bodies 1A and 1B are wound up. Thereby, unit link member coupling body 1A, 1B is wound around rotary body 3a, 3b, respectively (FIG. 10). Thus, the expansion / contraction construction leader 7 can change the height freely only by changing the rotation direction of the rotating bodies 3a and 3b.

  The stretchable construction leader of the present invention is not limited to the above embodiment, and various modifications can be adopted. The formation position of the 4th engaging part formed in the connection surface of a unit link member is not limited to a right-and-left both-ends part, You may form in any location of a connection surface. In that case, the 3rd engaging part formed in a rotary body is a position corresponding to a 4th engaging part. In addition, the engagement of the projecting third engaging portion and the concave fourth engaging portion is performed because the unit link members 11a and 11b are engaged while rotating around the connecting members 12a and 12b. It is preferable to make the side surface of the protrusion in the feeding direction arc.

  In the extension work leader of the present invention, examples of the ground improvement device include a ground improvement hollow tube, a rod, a deep mixed processing pile device, a prefabricated vertical drain construction device, and the like. What engages with the engagement guide part of the expansion and contraction construction leader of the present invention is a guide part on the ground improvement device side, and various shapes corresponding to the shape of the engagement guide part can be used.

  According to the stretchable construction leader of the present invention, the height of the leader can be adjusted by rotating the rotating body. For this reason, when the restricted height changes around the airport, the leader height and the ground improvement device height can be adjusted to the restricted height at any time, so that the construction can be efficiently performed even in the restricted height area. Moreover, since it is not the expansion-contraction structure by a double pipe, since the various engagement guide parts which guide the ground improvement apparatus extended in the longitudinal direction of a leader outer peripheral surface can be taken, a use application spreads.

DESCRIPTION OF SYMBOLS 1A 1st unit link member coupling body 1B 2nd unit link member coupling body 2 Tip coupling | bond part 3a 1st rotary body 3b 2nd rotary body 4, 4a-4d Engagement guide part
DESCRIPTION OF SYMBOLS 5 Non-connection surface 6 Connection surface 7 Leader 8a, 8b Crimping device 9a, 9b Support member 10, 10a, 10b Expansion construction leader 11a, 11b Unit link member 12a, 12b Connection member 13 Crane 40 Rotating body drive means 50, 50a-50c Ground improvement machine 60a, 60b Ground improvement device

Claims (9)

A first and second unit link member coupling body formed by sequentially coupling a plurality of unit link members in a rotatable manner using a coupling member;
A tip coupling portion that couples the tips of the first and second unit link member coupling bodies;
First and second rotating bodies for winding or sending the first and second unit link member coupling bodies, respectively;
An engagement guide portion for guiding the ground improvement device formed on the first and second unit link member coupling body or the tip coupling portion;
Rotating body driving means for driving the rotating body,
The first and second unit link member coupling bodies each have a coupling surface on which the coupling member is formed and a non-coupling surface on which the coupling member on the opposite side of the coupling surface is not formed. The non-connecting surfaces of the first and second unit link member connecting bodies fed from the body are in contact with each other to form a columnar leader,
The expansion / contraction work leader, wherein the plurality of unit link members are rotatably connected to the connecting surface side with the connecting member as an axis.   The engagement guide part is a convex member having a circular cross section, an elliptical cross section, or a U-shaped cross section extending in the longitudinal direction of the leader, or a concave groove extending in the longitudinal direction of the leader. The expansion construction leader according to 1.   The telescopic construction leader according to claim 1, wherein the engagement guide portion is a top sheave having a pulley attached to a tip of the tip coupling portion.   The said unit link member forms a short hollow tube, if the opening part inside each other is faced | matched, The said leader is a hollow tube, The any one of Claims 1-3 characterized by the above-mentioned. The expansion and contraction construction leader according to the item.   The said rotary body is arrange | positioned so that the said non-connection surface of the said unit link member coupling body sent out from this rotary body may mutually contact | abut. Telescopic construction leader.   The crimping means which presses so that the non-connecting surface of the unit link member connecting body sent out from the rotating body may contact each other is further provided. Telescopic construction leader.   The unit link member includes a first side plate having the connection surface as a side surface, and second and third side plates having side surfaces parallel to a winding or feeding direction bent at a right angle from both ends of the first side plate. The stretchable construction leader according to any one of claims 1 to 6.   A first engaging portion is formed on the non-connecting surface of one unit link member of the unit link member connecting body, and the first connecting portion is formed on the non-connecting surface of the other unit link member of the unit link member connecting body. The expansion / contraction construction leader according to any one of claims 1 to 7, wherein a second engagement portion that engages with the engagement portion is formed. The rotary member is formed with a third engagement portion, and the connection surface is formed with a fourth engagement portion that fits into the third engagement portion. The stretchable construction leader according to any one of the above items.

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