JP6410295B2 - Forced lifting device and ground improvement construction device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a forced lifting device that is an expansion / contraction leader that forcibly lifts and lowers a ground improvement device such as a ground stirring and mixing treatment device, and a ground improvement construction device including the same.

  As a ground improvement device used for soft ground improvement, for example, a ground agitation mixing processing device (deep mixing processing pile device) (Japanese Patent Laid-Open No. 2002-235321), a sand pile forming device (Japanese Patent Laid-Open No. 8-284146) or a prefab A rectilinear vertical drain generation device (Japanese Patent Laid-Open No. 2000-160544) is known. As the ground agitation mixing processing apparatus, for example, a rod provided with a stirring blade at a tip portion of a rod and an upper end portion of the rod fixed to a leader is known. In this ground agitation mixing processing device, the leader becomes a forced lifting device, and is penetrated into the ground in synchronization with the reduction of the leader, and is pulled out from the ground in synchronization with the extension of the leader.

  On the other hand, there is a case where the ground is improved at a place where the height is restricted, such as around the airport, and the ground is improved by using the same ground improvement construction apparatus at a place where the height restriction is relaxed. In this case, since it is necessary to make the height of the construction leader below the limit height, the leader height must be reduced. At that time, the construction length that can be constructed by the leader is shortened. For this reason, there is a problem that the construction efficiency is poor because the construction rod is constructed by adding the construction rod, or the rod is expanded and contracted to construct the necessary improved length.

  Japanese Laid-Open Patent Publication No. 9-41355 discloses a telescopic leader having an inner / outer double structure provided with a pin roller jack-up device and having a top sheave provided with a pulley that hangs a wire on the tip of an upper inner tube. ing. 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, the expandable leader having a double-pipe structure described in JP-A-9-41355 has a double structure in which the upper inner pipe is fitted into the lower outer pipe. However, since it is limited to the lower outer pipe, it cannot be a forced lifting device of the ground improvement device.

  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 a leader that forcibly raises and lowers the ground improvement device is not possible. It was impossible.

  Accordingly, an object of the present invention is to provide a forcible elevating device that can freely adjust the height and forcibly elevating and lowering the ground improvement device, and a ground improvement construction device including the same.

  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 tip coupling portion that couples the tips of the first and second unit link member coupling bodies, and a ground improvement device attached to the first and second unit link member coupling body or the tip coupling section. A leader side connecting portion to be connected; first and second rotating bodies for winding or sending the first and second unit link member connecting bodies; 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 links The non-connecting surfaces of the material connecting body are in contact with each other to form a columnar leader, and the plurality of unit link members are elastically connected to the connecting surface side with the connecting members as axes. The present invention provides a forced lifting device characterized by being a leader.

  Moreover, this invention provides the ground improvement construction apparatus provided with the said forced raising / lowering apparatus and the ground improvement apparatus connected with the said leader side connection part.

  According to the forced lifting device of the present invention, the height of the leader can be adjusted by rotating the rotating body. Moreover, since the leader and the ground improvement apparatus are united with the ground improvement construction apparatus of this invention, a leader functions as a forced raising / lowering apparatus. For this reason, when the restricted height changes, the leader height is changed, and by adjusting the height of the ground improvement device to the leader height as needed, construction can be performed efficiently even in the height restricted area or height restricted relaxation area. . Although it is necessary to prepare a ground improvement device with a different device height and replace it, it is simpler than rod extension and rod expansion / contraction.

It is the schematic of the ground improvement construction apparatus in embodiment of this invention. It is a front view of the forced raising / lowering apparatus (expandable leader) used with the ground improvement construction apparatus of FIG. It is a perspective view of the forced raising / lowering apparatus of FIG. It is a figure explaining the unit link which comprises the forced raising / lowering apparatus of FIG. 2, and a unit link member coupling body. It is a front view of another forced raising / lowering apparatus. It is a front view of another forced raising / lowering apparatus. (A) is a fragmentary perspective view of a forced raising / lowering apparatus, (B) is a part of unit link member coupling body seen from the X direction of (A). It is a figure explaining the construction method using the ground improvement construction apparatus of FIG. 1, (A), (B) and (C) are penetration processes, and in order of (A), (B) and (C) Intrusion proceeds.

  Next, a ground improvement construction apparatus (hereinafter also simply referred to as “construction apparatus”) and a ground improvement construction method using the same in the embodiment of the present invention will be described with reference to FIGS. The construction apparatus 10 includes a forced lifting device 1 and a ground improvement device 2 which are expansion / contraction leaders. The forced lifting device 1 has a novel structure and forcibly lifts and lowers the ground improvement device 2 connected and fixed to the leader 7.

  First, the forced raising / lowering apparatus 1 which comprises the construction apparatus 10 is demonstrated. The forced elevating device 1 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. Connected to the tip connection portion 72 for connecting the respective tips of the bodies 1A and 1B, the first rotating body 3a and the second rotating body 3b for winding or sending the unit link member connecting bodies 1A and 1B, respectively, and the ground improvement device 2 The reader side connecting portion 71 that performs the rotation and the rotating body driving means 40 that drives the first and second rotating bodies 3a and 3b are provided.

  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 forced elevating device 1 have the above-mentioned U-shaped cross-sectional shape, and the formed hollow tube is not limited to a rectangular shape, for example, a hollow in which the openings inside each other are abutted. 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 forced elevating device 1, the first engagement portion 114a and the second engagement portion 114b are not limited to the engagement of the 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 forced elevating device 1 has a tip coupling portion 72 that couples the tips of the unit link member coupling bodies 1A and 1B. By having the tip coupling part 72, the unit link member coupling bodies 1A and 1B that have been unwound can form the columnar leader 7 without leaving each other.

  The forced elevating device 1 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 forced elevating device 1, the first and second rotating bodies 3a and 3b are arranged so that the non-connecting surfaces of the unit link member connecting bodies 1A and 1B fed out from them generally 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 forced elevating device 1, the first and second rotating bodies 3 a, 3 b and the crimping means 8 a, 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 in a crane etc., for example (refer FIG. 1).

  The forced elevating device 1 has a leader side connecting portion 71 for connecting to the unit link member connecting bodies 1A, 1B or the ground improvement device attached to the tip connecting portion 72. Examples of the leader side connecting portion 71 include known ones such as a bolt hole, a fixing bolt, a fitting projection, and a fitting concave portion, and in this example, a bolt hole. The connection between the leader 7 and the ground improvement device 2 is fixed so that the leader 7 functions as a forced lifting device, so that it descends in synchronization with the reduction of the leader 7 and rises in synchronization with the extension of the leader 7. Means that Moreover, when the leader side connection part 71 is attached to unit link member coupling body 1A, 1B, a pair of leader side connection parts 71 are symmetrically located in both unit link member coupling body 1A and unit link member coupling body 1B. It is attached. Thereby, when the ground improvement apparatus 2 is forcibly penetrated into the ground, it is preferable in that a load is equally applied to the rotating bodies 3a and 3b. In addition, the ground improvement device 2 is such that the formation position of the leader side connecting portion 7 in the unit link member connecting body 1A and the unit link member connecting body 1B is a surface orthogonal to the connecting surface 6 and on the side opposite to the rotating body driving means. Is preferable in that it is located on the side opposite to the rotating body driving means and does not hinder the movement of the reader 7. Bolts 71 for fixing the leader 7 and the driving means 21 of the ground improvement device 2 are fitted into the bolt holes 71. Further, a wire connecting portion 73 is attached to the upper portion of the leader 7 of the forced lifting device 1. The other end of the wire 46 is fixed to the crane 13 and keeps the leader 7 stable.

  The forced elevating device 1 includes a rotating body driving unit 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, a forced lifting device 1a which is a modification of the forced lifting device 1 will be described with reference to FIG. In the forced elevating device 1a, the same components as those in the forced elevating device 1 are denoted by the same reference numerals, description thereof is omitted, and different points will be mainly described. That is, the forced lifting device 1a is different from the forced lifting device 1 in that the first and second rotating bodies 3a and 3b are brought into contact with the unconnected surfaces of the unit link member linked bodies 1A and 1B fed from them. And the installation of the crimping device 8 is omitted. That is, the forced lifting device 1a also serves as a crimping device. Such a forced lifting device 1a 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 forced elevating device 1a, the columnar leader 7 can be reliably formed by sending out the first and second rotating bodies 3a and 3b.

  Next, a forced lifting device 1b, which is another modification of the forced lifting device 1, will be described with reference to FIG. In the forced elevating device 1b, the same components as those in the forced elevating device 1 are denoted by the same reference numerals, description thereof is omitted, and different points will be mainly described. That is, in the forced elevating device 1b, the difference from the forced elevating device 1 is that after winding the first and second rotating bodies 3a and 3b without winding all 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 forced elevating device 1b, 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 placed on the mounting 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 forced elevating device 1b is effective when there is no restriction in the lateral region.

  Next, the forced elevating device 1c will be described with reference to FIG. In the forced elevating device 1c, the same components as those in the forced elevating device 1 are denoted by the same reference numerals, description thereof will be omitted, and different points will be mainly described. That is, the forced lifting device 1c is different from the forced lifting device 1 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. In addition, when the leader side connection part 71 is a fitting protrusion, the problem of the disorder | damage | failure by spiral winding can be solved by enlarging winding pitch.

  As a method of coupling two unit link members to be coupled at an inclination angle α, for example, as shown in FIG. 7B, in the first unit link member coupling body 1A, the unit link member as viewed from the non-coupling surface 5 11a may be inclined at an angle α in the direction in which the contact surface 116a of the unit link member 11a to be coupled is spirally wound (inclined to the right in FIG. 7B). Thereby, 1A of 1st unit link member coupling bodies are wound in the 1st rotary body 3a by the inclination (alpha). According to the forced elevating device 1c, it is effective when the lateral region is limited.

  Next, the ground improvement device 2 will be described. The ground improvement device 2 is coupled to the unit link member coupling bodies 1 </ b> A and 1 </ b> B of the forced lifting device 1 or the leader side coupling portion 71 of the tip coupling portion 72. That is, the ground improvement device side connecting portion is connected to the leader side connecting portion 71. As a ground improvement apparatus side connection part, it connects with the leader side connection part 71, and well-known things, such as a bolt fastening board, a bolt hole, a fitting protrusion, and a fitting recessed part, are mentioned. Thereby, the ground improvement apparatus 2 descends in synchronization with the reduction of the leader 7 and rises in synchronization with the extension of the leader 7. In this example, the ground improvement device 2 is a ground mixing and processing device (deep mixing processing pile device), and includes a rotating shaft 22 and a single-stage or multi-stage stirring blade 23 radially attached to the lower portion of the rotating shaft 22. And a solidified material discharge pipe port 25 attached to a predetermined position of the rotating shaft. Reference numeral 21 denotes a drive motor unit, and reference numeral 24 denotes a common rotation prevention plate.

  The ground improvement device 2 is not limited to the above ground agitation mixing treatment device, and known devices such as a known high-pressure jet agitation device, prefabricated vertical drain formation device, sand pile formation device, and the like. Examples of the high pressure jet agitating device include a drive motor unit, a high pressure solidified material supply pipe having a high pressure solidified material injection port at the tip, and a hollow tube incorporating a compressed air supply pipe having a compressed air injection port. . In this case, the upper end of the hollow tube is fixed to the leader 7. The ground improvement device of the present invention is fixed to the leader 7 and interlocks with the elevation (extension / contraction) of the leader 7. Further, the ground improvement device of the present invention may be independently rotated, expanded and contracted, moved up and down, etc., in addition to the movement interlocking with the raising and lowering of the leader 7.

  Next, the ground improvement construction method using the construction apparatus 10 of the present invention will be described with reference to FIG. The construction apparatus 10 is used in a place where the height restriction is loose, and the height of the leader 7 is high. The forced elevating device 1 is mounted on a crane 13 and has a state in which the unit link member coupling bodies 1A and 1B are not wound around the rotating bodies 3a and 3b, and the height of the leader 7 is high. In the construction apparatus 10, the drive motor unit 21 of the ground agitation mixing processing apparatus 2 is above the leader 7, orthogonal to the connection surface 6 of the unit link member connection body 1 </ b> A and the unit link member connection body 1 </ b> B, and a counter-rotating body. It is fixed to the surface on the drive means side (FIG. 8A).

  Next, the ground stirring and mixing apparatus 2 is penetrated into the ground from the state of FIG. At this time, the rotating body driving means of the forced elevating device 1 is operated, and the drive motor unit 21 of the ground agitation mixing processing device 2 is driven. That is, the unit link member coupling bodies 1A and 1B are wound around the rotating bodies 3a and 3b, and the leader 7 formed by the unit link member coupling bodies 1A and 1B is gradually reduced. The ground agitation mixing apparatus 2 descends in conjunction with the descent of the leader 7, and the rotating shaft 22 rotates, so that the ground agitation is excavated by the agitating blade 23 and penetrates into the ground (FIGS. 8B and 8C). )). That is, the forced elevating device 1 forcibly penetrates the ground agitation mixing processing device 2 into the ground. At this time, the cement milk is discharged from the ground cement milk supply facility from the solidifying material discharge port 25, and stirred and mixed in the ground to form a solidified pile (not shown). As a method of winding the unit link member coupling bodies 1A and 1B around the rotating bodies 3a and 3b, when the surroundings of the rotating bodies 3a and 3b are limited in place, spiral winding may be used, and the surroundings of the rotating bodies 3a and 3b may be placed. If not limited, a method of supporting the first and second rotating bodies 3a and 3b on the side opposite to the feeding side as shown in FIG. 6 and supporting members 9a and 9b extending in the lateral direction outside may be used. When the predetermined depth is reached, the rotary shaft penetration step is finished.

  Next, the leader 7 of the forced lifting device 1 is extended. That is, the unit link member coupling bodies 1A and 1B are sent out from the rotating bodies 3a and 3b, and the leader 7 formed by the unit link member coupling bodies 1A and 1B is gradually extended upward. The ground stirring and mixing apparatus 2 rises in conjunction with the rise of the leader 7. Further, the ground is pulled out while rotating the rotating shaft 22 in the normal rotation direction or the reverse rotation direction by the drive motor unit 21 of the ground stirring and mixing processing device 2. The discharge of the solidified material is not limited to the penetration process, and the solidified material is discharged from the solidified material discharge pipe port 25 when the rotary shaft 22 is pulled out from the ground, or in both penetration and withdrawal, and is stirred and mixed in the ground. May be. Thus, the forced elevating / lowering device 1 can forcibly penetrate or forcibly pull out the ground stirring / mixing processing device 2 only by changing the rotation direction of the rotating bodies 3a and 3b. Moreover, when the construction apparatus 10 is used in a place where the height restriction is loose, a ground improvement apparatus having a long construction length corresponding to the height of the leader 7 can be used.

  Next, when the construction apparatus 10 is used in a place with a height restriction, the ground agitation mixing processing apparatus (ground improvement apparatus) 2 having a large construction length is removed from the construction apparatus 10 in FIG. Reduce the height. The height of the leader 7 can be lowered by winding the unit link member coupling bodies 1A and 1B around the rotating bodies 3a and 3b. What is necessary is just to attach the ground stirring mixing processing apparatus (ground improvement apparatus) 2 equivalent to leader length with respect to the forced raising / lowering apparatus 1 of such a low leader length. As described above, according to the construction device of the present invention, when the restricted height changes, the height of the ground improvement device is adjusted to the leader height at any time, so that it can be efficiently performed even in the height restricted area or the height restricted relaxation area. Can be constructed.

  In the construction apparatus 10 of the present invention, the ground improvement apparatus 2 can be a drain construction apparatus having a hollow tube with a tapered tip. The hollow tube having a tapered tip is fixed to the leader 7 of the forced elevating device 1 at the upper part and penetrates and withdraws from the ground. A pre-fabricated vertical drain is passed through the tapered hollow tube, and the tip of the pre-fabricated vertical drain and the anchor are locked ahead of the tapered hollow tube. Examples of prefabricated vertical drains include plastics such as paper drains and artificial products using natural fiber materials. These vertical drains are installed in the cohesive land and used as drainage columns.

  Next, the prefabricated vertical drain method using the construction apparatus 10 will be described. First, the first and second rotating bodies 3a and 3b are rotated, the unit link member coupling bodies 1A and 1B are wound up, and the leader 7 formed by the unit link member coupling bodies 1A and 1B is gradually reduced. Thus, the prefabricated vertical drain is introduced into the ground in synchronization with the penetration of the hollow tube 7. When the anchor reaches a predetermined depth, the rotation of the first and second rotating bodies 3a and 3b is stopped. Next, a drawing process is performed. In the drawing step, the rotation of the first and second rotating bodies 3a and 3b is reversed to send the unit link member coupling bodies 1A and 1B upward, and the hollow tube is pulled out. Since the tapered casing at the tip and the anchor are not joined, the prefabricated vertical drain together with the anchor is left in the ground.

  In the construction device of the present invention, as the ground improvement device 2, a sand pile forming hollow tube can be used. The upper part of the sand pile building hollow pipe is fixed to the forced lifting device 1. A hopper is installed on the top of the sand pile building hollow pipe. The sand pile material is fed into a hopper from an elevating basket attached to the lateral surface of the leader 7 so as to be movable up and down, and supplied to the inside of the sand pile forming hollow pipe. The hollow pipe for sand pile construction can be provided with an inner jet pipe for assisting the discharge of sand pile material, and an outer jet pipe for intrusion assistance, and with an open / close valve attached to the tip. The sand pile material may be a known material that has been used in the conventional sand pile construction method, and examples thereof include sand, sand containing silt and gravel, crushed stone, and slag. For example, sand having a particle size of about 0.074 to 2.0 mm can be used.

  Next, an example of the sand pile construction method using the construction apparatus 10 will be described. In the penetration step, the first and second rotating bodies 3a and 3b are rotated to wind up the unit link member coupling bodies 1A and 1B, and the leader 7 formed by the unit link member coupling bodies 1A and 1B is gradually formed. Reduce. The hollow tube descends in conjunction with this. Then, after penetrating the hollow tube to a predetermined depth in the ground, the step of drawing out the hollow tube as appropriate and the step of re-penetrating the hollow tube are sequentially repeated until reaching the ground surface. What is necessary is just to perform by the conventional method of discharging | emitting sand pile material in a pipe | tube, and applying compressive force to this sand pile material at a re-penetration process. The sand pile material may be introduced into the hollow tube before the penetration step or after the tip of the hollow tube has penetrated to a predetermined depth. The hollow tube is drawn out by rotating the first and second rotating bodies 3a and 3b and feeding the unit link member coupling bodies 1A and 1B upward to form the unit link member coupling bodies 1A and 1B. This is done by extending the reader 7 to be extended.

  The forced elevating device 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. Moreover, in this invention, the ground improvement apparatus is not limited to the said embodiment, All the apparatuses which implement the process penetrated into the ground and the process pulled out from the ground can be used.

  According to the construction apparatus of the present invention, since the expansion / contraction leader and the ground improvement device are integrated, the leader functions as a forced lifting device. For this reason, when the restricted height changes around the airport or the like, it can be efficiently constructed even in the height restriction area or the height restriction relaxation area by adjusting the height of the ground improvement device to the leader height as needed.

DESCRIPTION OF SYMBOLS 1 Forced raising / lowering apparatus 1A 1st unit link member coupling body 1B 2nd unit link member coupling body 2 Ground improvement apparatus 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 Ground improvement construction apparatus 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 72 Tip joint

Claims (10)

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;
A leader side connecting portion connected to the ground improvement device attached to the first and second unit link member connecting bodies or the tip connecting portion;
First and second rotating bodies for winding or sending the first and second unit link member coupling bodies, respectively;
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, and the plurality of unit link members include the connecting members. An expansion / contraction leader that is rotatably connected to the connection surface side as an axis. By rotating the rotating body, the ground improvement device connected to the leader is lowered in synchronization with the reduction of the leader, and the leader is extended. Forced lifting device characterized by being raised in synchronization with   2. The forced lifting device according to claim 1, wherein the unit link member forms a short hollow tube when the inner openings are abutted against each other, and the leader is a hollow tube. .   3. The forced lifting device according to claim 1, wherein the rotating body is arranged such that the non-connecting surfaces of the unit link member connecting bodies fed from the rotating body are in contact with each other.   The pressure bonding means which presses so that the said non-connecting surface of the said unit link member coupling body sent out from the said rotary body may mutually contact | abut is provided, The any one of Claims 1-3 characterized by the above-mentioned. Forced lifting device.   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 forced raising / lowering apparatus of any one of Claims 1-4 characterized by these.   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 forced lifting device according to any one of claims 1 to 5, wherein a second engaging portion that engages with the engaging portion is formed.   The rotary body 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 forced raising / lowering apparatus of any one of Claims. The forced elevating device according to any one of claims 1 to 7,
A ground improvement construction device comprising: a ground improvement device connected to the leader side connection portion.   9. The ground improvement construction apparatus according to claim 8, wherein the ground improvement device descends in synchronization with the reduction of the leader and rises in synchronization with the extension of the leader.   The ground improvement construction device according to claim 8 or 9, wherein the ground improvement device is a ground stirring and mixing treatment device, a sand pile forming device, a high-pressure jet stirring device or a prefabricated vertical drain forming device.

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