JP5602965B1 - Extension device for ground improvement and ground improvement device - Google Patents

Abstract

The present invention provides a ground improvement device that can reduce the height of the ground improvement device, eliminates the need for an addition process and a stretching process, and enables downsizing of the device, and a ground improvement stretching device used therefor.
A unit link member formed by sequentially connecting a plurality of unit link members 11 which form a short hollow tube when the openings inside each other are butted together using a connecting member 12. The coupling bodies 1A and 1B, the distal end coupling portion 2 that couples the respective distal ends of the unit link member coupling bodies, the rotating bodies 3a and 3b that wind up or send the unit link member coupling bodies, and the rotation bodies are driven. The unit link member coupling body includes a coupling surface 6 on which the coupling member is formed, and a non-coupling surface 5 on which the coupling member on the opposite side of the coupling surface 6 is not formed. The non-connecting surfaces of the unit link member connecting bodies fed from the rotating bodies 3a and 3b are in contact with each other to form the hollow tube 7.
[Selection] Figure 1

Description

  The present invention relates to a ground improvement device that can be efficiently constructed to a deep depth even in a construction area with a height restriction, and a ground improvement stretching device used therefor.

  As a ground improvement device used for soft ground improvement, 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. These ground improvement devices use construction leaders that support rods and hollow pipes deeply into the ground and support them on the ground.

  When ground improvement is performed in a place where there is an airspace restriction that cannot be performed with the normal ground improvement device height, it is necessary to set the height of the construction leader below the limit height. In this case, the construction length that can be constructed by the leader length is shortened. For this reason, the construction rods were added and constructed, or the rods were expanded and contracted to construct the necessary improved length.

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

  However, in the method where the construction rod is added in a place where air space is restricted, it takes time to add the construction rod, and additional personnel are required, resulting in poor construction efficiency. In addition, the method of extending and retracting the rod has a problem that it takes time to expand and contract, and when the number of expansion and contraction steps increases, the expansion and contraction rod becomes large, and the stability of the construction apparatus is deteriorated.

  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, the unit block used in the expansion / contraction mechanism described in JP-A-2005-177886 has a quadrangular prism shape, and the legs formed by the pair of block connecting bodies are solid and do not constitute a hollow tube, and the ground It could not be applied to the improved device.

  Therefore, an object of the present invention is to reduce the height of the ground improvement device, eliminate the need for the addition process and the expansion / contraction process, or reduce the number of implementations, and to reduce the number of the ground improvement apparatus and the ground improvement apparatus capable of downsizing. An object of the present invention is to provide a stretching device for ground improvement to be used.

That is, the present invention solves the above-described conventional problems, and rotates a plurality of unit link members that form a short hollow tube by using a connecting member when the inner openings are abutted with each other. A first and second unit link member coupling body formed by sequentially connecting the first and second unit link member coupling bodies; a first coupling portion coupling the respective distal ends of the first and second unit link member coupling bodies; first and second rotator hoisting or feeding unit link member connecting member, respectively, and a rotary body drive means for driving the rotating body, said first and second unit link member connecting member said connecting member is in a connecting surface which is formed has a non-coupling surface of the coupling member is not formed on the side opposite of the connecting surfaces respectively sent out from the rotating member said first and second unit link member connection body abut each other in the non-connecting faces All SANYO to form a hollow tube in contact, the unit link member of the plurality provides an soil improvement for telescopic device, characterized in that it is rotatably coupled to the coupling surface of the coupling member as an axis Is.

  Moreover, this invention provides the ground improvement apparatus provided with the said expansion-contraction apparatus for ground improvement.

  According to the ground improvement device of the present invention, the step of adding is unnecessary, the time and labor required for adding can be reduced, and the construction cost can be kept low. Similarly, the rod expansion / contraction step is unnecessary, the time and labor required for expansion / contraction can be reduced, the device can be miniaturized, and the stability of the ground improvement device is improved. Moreover, the expansion device for ground improvement of the present invention (hereinafter also simply referred to as “expansion device”) is suitable as a component device of the ground improvement device of the present invention.

It is a front view of the expansion-contraction apparatus in embodiment of this invention. It is a perspective view of the expansion-contraction apparatus of FIG. FIG. 2 is a simplified diagram of a unit link and a unit link member coupling body used in the extension device of FIG. 1. It is a perspective view of the expansion-contraction apparatus in other embodiment of this invention. It is a front view of the expansion-contraction apparatus of FIG. It is a front view of the expansion-contraction apparatus in other embodiment of this invention. (A) is a fragmentary perspective view of the expansion-contraction apparatus in other embodiment of this invention, (B) is a part unit link member coupling body seen from the X direction of (A). (A) is a front view of the ground improvement apparatus in embodiment of this invention, (B) is a side view of (A). (A) is the simplified front view of the ground improvement apparatus in other embodiment of this invention, (B) is an enlarged view of the front-end | tip part of the ground improvement apparatus of (A). It is a perspective view of the front-end | tip part of the ground improvement apparatus of FIG. It is a simplified front view of the ground improvement apparatus in other embodiment of this invention. (A) is the simplified front view of the ground improvement apparatus in other embodiment of this invention, (B) is an enlarged view of the front-end | tip part of the ground improvement apparatus of (A).

  Next, the telescopic device according to the embodiment of the present invention will be described with reference to FIGS. The telescopic device 10 includes a first unit link member coupling body 1A and a second unit link member coupling body 1B, and the first and second unit link member coupling bodies 1A and 1B (hereinafter simply referred to as “unit link member coupling body”). )), The first rotating body 3a and the second rotating body 3b for winding or feeding the unit link member coupling bodies 1A and 1B, respectively, and the first and second rotating bodies 3a. Rotating body driving means 4 (not shown in FIGS. 1 to 7) for driving 3b, and used for ground improvement.

  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 forms a short hollow tube when the opening portions inside each other are abutted, and in this example, a rectangular first side plate 111a having a connecting surface 6 as a side surface, The side plate 111a has a U-shaped cross-sectional shape composed of a rectangular second side plate 112a and a third side plate 113a having side surfaces parallel to a winding or feeding direction bent at right angles from both ends of the 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 indicate openings in the direction of winding or feeding. The short hollow tube is distinguished from the long hollow tube 7 formed by the unit link member coupling bodies 1 </ b> A and 1 </ b> B, and is shorter than the long hollow tube 7. Say.

  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). By connecting the plurality of unit link members 11a in this manner, the first unit link member link 1A can be rotated around the connection surface 6 with the connection member 12a as an axis, and can be wound around the rotary bodies 3a and 3b. To. 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, the thickness of the second side plate 112a and the third side plate 113a, This is a surface having a length and a length in the delivery direction, which is smaller than the connection surface 6 in terms of area.

  The connecting member 12a is a hinge member, and examples thereof include a hinge and a pin. When the connecting member 12a connects the plurality of unit link members 11a, the connecting unit 12a is connected to the first unit link member when the rotating portion 3a is wound up. It is preferable in that the contact between the body 1A and the rotating body 3a is a surface contact, and 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 concave first engaging portion 114a, which is an optional component, is formed on the non-connecting surface 5 of the unit link member 11a. As a result, the first engaging portion 114a engages with the convex second engaging portion 114b formed on the non-connecting surface 5 of the other unit link member 11b, thereby reliably forming the hollow tube 7. can do.

  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 coupling surface 6 is a position corresponding to the end portion in the direction orthogonal to the winding or feeding direction, that is, the position corresponding to the second side plate 112a and the third side plate 113a, thereby forming a deep hole. It is preferable in that it can be performed. 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.

  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, the unit link member 11b and the second unit link member connection body 1B of this example are different from the unit link member 11a and the first unit link member connection body 1A in that the concave shape on the non-connection surface 5 of the unit link member 11a. A projecting second engagement portion 114b that engages with the first engagement portion 114a is formed at a position facing the first engagement portion 114a. 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 1B contacts to form the hollow tube 7.

  The unit link members 11a and 11b of the telescopic device 10 have the above-mentioned U-shaped cross-sectional shape, and the formed hollow tube is not limited to a rectangular one. For example, the hollow tube in which the openings inside each other are abutted The 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. Moreover, in the unit link members 11a and 11b of the telescopic device 10, the first engagement portion 114a and the second engagement portion 114b are not limited to the engagement of the concave and convex portions, and various engagements other than the concave and convex portions can be applied. Further, the first engaging portion 114a and the second engaging portion 114b may not be provided.

  In the telescopic device 10, the unconnected surfaces of the unit link member coupling bodies 1A and 1B that form the hollow tube are sealed. That is, in FIG. 3, the unconnected surface (inner end surface) of the second side plate 112a and the third side plate 113a of the unit link member 11a or the unconnected surface (inner end surface) of the second side plate 112b and the third side plate 113b of the unit link member 11b. ) Is a seal structure. Thereby, even if the hollow tube 7 penetrates into the ground, groundwater and earth and sand do not enter from the non-connected surface.

  In the telescopic device 10, the contact surfaces on the side where the unit link member coupling bodies 1 </ b> A and 1 </ b> B forming the hollow tube are wound or sent out are sealed. That is, in FIG. 3, both end surfaces of the unit link member 11a on the side where the second side plate 112a and the third side plate 113a are wound or sent out and both ends of the unit link member 11b on the side where the second side plate 112b and third side plate 113b are rolled up or sent out. The surface is a seal structure. Thereby, even if the hollow tube 7 penetrates into the ground, groundwater and earth and sand do not enter from this contact surface. As the seal structure, for example, a well-known seal structure in a surface-surface contact in which an elastomer member having a circular cross section is attached to a groove formed in the seal surface can be employed.

  The telescopic device 10 includes 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 are unwound can form the hollow tube 7 without being separated from each other.

  The telescopic device 10 includes first and second rotating bodies 3a and 3b that wind up or send out 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 joint portions 32a and 32b are formed, and the unit link member coupling bodies 1A and 1B are wound up and sent out by hooking the unit link members 11a and 11b on the projecting third engagement portions 32a and 32b. 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, which are wound or sent 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 anti-ground side are fixed to the first and second rotating bodies 3a and 3b. Thereby, even if the unit link members 11a and 11b as shown in FIG. 1 are located directly below the first and second rotating bodies 3a and 3b, they do not come off 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 device 10, 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 the first and second rotating bodies 3a and 3b 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 device 10, the first and second rotating bodies 3 a, 3 b and the crimping means 8 a, 8 b are installed on 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 In the bottom plate of the support base 19, openings through which the unit link member coupling bodies 1A and 1B pass are formed. The support base 19 is installed, for example, on a crane or the like (see FIG. 8).

  The telescopic device 10 includes rotating body driving means 4 that drives the first and second rotating bodies 3a and 3b. The rotating body driving means 4 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 4 attached to the crane 13 and the known means for controlling it can be used.

  Next, a telescopic device 10a, which is a modification of the telescopic device 10, will be described with reference to FIGS. In the expansion / contraction device 10a, the same components as those of the expansion / contraction device 10 are denoted by the same reference numerals, description thereof is omitted, and different points will be mainly described. That is, the expansion / contraction device 10a is different from the expansion / contraction device 10 in that the first and second rotating bodies 3a and 3b are arranged so that the non-connection surfaces of the unit link member connection bodies 1A and 1B fed out from them contact each other. In addition, the installation of the crimping device 8 is omitted. That is, the telescopic device 10a also serves as a crimping device. Such a telescopic device 10a is formed between the rotation shafts 33a and 33b of the first and second rotating bodies 3a and 3b with 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 empty tube. Also in the telescopic device 10a, the hollow tube 7 can be reliably formed by feeding the first and second rotating bodies 3a and 3b.

  Next, a telescopic device 10b, which is a modification of the telescopic device 10, will be described with reference to FIG. In the expansion / contraction device 10b, the same components as those of the expansion / contraction device 10 are denoted by the same reference numerals, description thereof will be omitted, and differences will mainly be described. In other words, the expansion / contraction device 10b differs from the expansion / contraction device 10 in that the unit link member coupling bodies 1A and 1B are not wound up and are wound in the lateral direction after being wound up by the first and second rotating bodies 3a and 3b. It is intended to move. 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 support 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 device 10b, the unit link member coupling bodies 1A and 1B that have been rolled up are rolled up by about a quarter of the first and second rotating bodies 3a and 3b, and then placed on the placement surface 91 of the support members 9a and 9b. Move while sliding. The telescopic device 10b is effective when there is no restriction in the lateral region.

  Next, the telescopic device 10c will be described with reference to FIG. In the expansion / contraction device 10c, the same components as those of the expansion / contraction device 10 are denoted by the same reference numerals, description thereof will be omitted, and differences will mainly be described. That is, the expansion / contraction device 10c is different from the expansion / contraction device 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.

  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 second unit link member coupling body 1B, the unit link member as viewed from the non-coupling surface 5 11b may be inclined at an angle α in the direction in which the abutting surface 116b of the unit link member 11b to be coupled is spirally wound (inclined to the right in FIG. 7B). Thereby, the 2nd unit link member coupling body 1B is wound in the 2nd rotary body 3b by the inclination (alpha). According to the telescopic device 10c, it is effective when the lateral region is limited.

  Next, the ground improvement device 50 according to the embodiment of the present invention will be described with reference to FIG. The ground improvement device 50 includes the telescopic device 10. That is, the ground improvement device 50 is mounted on the crane 13. In the ground improvement device 50, the distal end coupling portion 2 of the telescopic device 10 joins the respective distal ends of the unit link member coupling bodies 1A and 1B, and can take various forms depending on the type of the ground improvement device. . That is, the distal end coupling portion 2 functions as a distal end functional portion that performs a predetermined function as the hollow tube 7 penetrates, or a distal end operating portion that performs a predetermined operation by obtaining a predetermined driving force. In FIG. 8B, the description of the crimping device 8 is omitted for the sake of brevity.

  Next, a method for improving the ground using the ground improvement device 50 will be described. In the telescopic device 10 of the ground improvement device 50 set at the construction position before construction, the unit link member coupling bodies 1A and 1B are wound around the first and second rotating bodies 3a and 3b, and the tip coupling portion 2 Is slightly fed out from the first and second rotating bodies 3a, 3b. When the telescopic device 10b of FIG. 6 is used, the unit link member coupling bodies 1A and 1B extending in the lateral direction are placed on the placement surfaces 91 of the support members 9a and 9b.

  Next, the rotating body driving means 4 is started, and the first and second rotating bodies 3a and 3b are synchronized and rotated at the same speed in opposite directions and in the delivery direction. Accordingly, the third engaging portions 32a and 32b of the first and second rotating bodies 3a and 3b are hooked on the fourth engaging portions 115a and 115b of the unit link members 11a and 11b. The member coupling bodies 1A and 1B are fed out, and the first engagement portions 114a of the unit link member 11a and the second engagement portions 114b of the unit link 11b are engaged by the crimping devices 8a and 8b, and the unit link member coupling body 1A and 1B is press-fitted into the ground while the non-connecting surfaces 5 come into contact with each other to form a hollow tube 7. The penetration process ends with a predetermined length of penetration. The penetration process is terminated by stopping the rotating body driving means 4. In addition, when penetrating to a depth deeper than the length of unit link member coupling body 1A, 1B, unit link member coupling body 1A, 1B should just be added. In the ground improvement process, the tip coupling portion 2 of the ground improvement device 50 performs a predetermined ground improvement with or after the hollow tube 7 penetrates, or obtains a predetermined driving force and performs a predetermined ground improvement. Do.

  Next, the drawing process will be described. The drawing process is started by first rotating the first and second rotating bodies 3a and 3b synchronously in opposite directions and at a constant speed in the winding direction. Accordingly, the third engaging portions 32a and 32b of the first and second rotating bodies 3a and 3b are hooked on the fourth engaging portions 115a and 115b of the unit link members 11a and 11b, and the first unit link member connecting body 1A. Are wound around the first rotating body 3a, and the second unit link member coupling body 1B is wound around the second rotating body 3b. When the telescopic device 10b of FIG. 6 is used, the unit link member links 1A and 1B wound up are placed on the placement surfaces 91 of the support members 9a and 9b and moved in the lateral direction. 1, the unit link members 11a and 11b on the ground tip side are fixed to the first and second rotating bodies 3a and 3b, and the unit link member coupling bodies 1A and 1B are It winds up, without removing from the 1st and 2nd rotary bodies 3a and 3b. In the drawing process, the crimping devices 8a and 8b may or may not be operated. In addition, in the penetration process of the hollow tube 7, penetration of the hollow tube 7 may be stopped, a pulling-up process may be inserted, and penetration and pulling may be performed repeatedly.

  Next, the ground improvement apparatus 50a is demonstrated with reference to FIG.9 and FIG.10. In the ground improvement device 50a, the same components as those in the ground improvement device 50 of FIG. 8 are denoted by the same reference numerals, description thereof will be omitted, and different points will be mainly described. That is, the ground improvement device 50a includes the expansion / contraction device 10, and the ground improvement material feeding means 20 for sending the ground improvement material 23 into the hollow tube 7 and the front end coupling portion 2 of the expansion / contraction device, and the front end coupling portion. 2 is hollow. In the ground improvement device 50a, the ground improvement material is the prefabricated vertical drain 23 in this example. Further, in the ground improvement device 50a, the tip coupling portion 2 is a tapered hollow tube, and the drain construction tip structure 2A is attached to the prefabricated vertical drain tip portion 231 ahead of the tip joining portion 2. Yes.

  The drain construction tip structure 2A is a well-known structure having an anchor 22 that engages with the tip portion 231 of the prefabricated vertical drain. 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, a difference between the prefabricated vertical drain method using the ground improvement device 50a and the ground improvement method using the ground improvement device 50 will be mainly described. First, the drain construction tip structure 2A is formed on the ground. Next, the ground improvement material charging means 20 is driven in synchronization with the rotation of the first and second rotating bodies 3a and 3b. Thereby, the prefabricated vertical drain 23 is introduced into the ground in synchronization with the penetration of the hollow tube 7. When the tip coupling portion 2 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 process, the unit link member coupling bodies 1A and 1B are wound up by reversely rotating the first and second rotating bodies 3a and 3b by the same method as the drawing process of the ground improvement device 50. Since the tapered casing 21 at the tip and the anchor 22 are not joined, the prefabricated vertical drain 23 together with the anchor is left in the ground.

  Next, the ground improvement device 50b will be described with reference to FIG. In the ground improvement device 50b, the same components as those in the ground improvement device 50 of FIG. 8 are denoted by the same reference numerals, description thereof will be omitted, and different points will be mainly described. That is, the ground improvement device 50b has the expansion / contraction device 10 and a ground improvement material charging means 20a for charging the ground improvement material into the hollow tube 7, and the tip coupling portion 2 is a hollow tube, It may be a square hollow tube similar to the hollow tube 7. That is, the ground improvement material is a sand pile material, and the tip coupling part 2 is a tip structure for sand pile construction.

  The ground improvement material charging means 20a includes a sand pile material tank 61, a conveyor 62 for sending the sand pile material in the sand pile material tank 61 to the hopper 63, and a hollow pipe 7 formed by the unit link member coupling bodies 1A and 1B. And a hopper 63 for dropping and filling the sand pile material from above. 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.

  Examples of the tip structure for sand pile construction include the tip structure of a hollow tube in a conventional sand pile construction device. Specific examples of the tip structure for sand pile construction include a straight hollow tube, a hollow tube with an open / close lid attached to the tip of the hollow tube, and a compressed air jet that promotes the discharge of sand pile material on the inner wall of the tip of the hollow tube The thing which attached the nozzle, the thing which attached the excavation bit to the front-end | tip of a hollow tube, and the thing which used these together are mentioned.

  Next, an example of a sand pile creation method using the ground improvement device 50b will be described. The penetration process is the same as the penetration process of the ground improvement device 50. Then, after penetrating the hollow tube 7 to a predetermined depth in the ground, the process of pulling out the hollow tube 7 as appropriate and the process of re-penetrating the hollow tube 7 are sequentially repeated until reaching the ground surface. What is necessary is just to perform by the conventional method of discharging | emitting the sand pile material in the hollow pipe 7 at a process, 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 7 before the penetration step or after the tip 29 of the hollow tube 2 has penetrated to a predetermined depth.

  Next, the ground improvement device 50c will be described with reference to FIG. In the ground improvement device 50c, the same components as those in the ground improvement device 50 of FIG. 8 are denoted by the same reference numerals, description thereof will be omitted, and different points will be mainly described. That is, the ground improvement device 50c includes the expansion and contraction device 10 and a power line or piping 28 having one end passed through the hollow portion 7 connected to the ground supply source 20b, and the distal end coupling portion 2 is a drive motor. 24 and an agitating blade 25 located on the tip side of the drive motor 24.

  Examples of the power line 28 include a hydraulic hose when the drive motor 24 is a hydraulic motor, and an electric cord when the drive motor is an electric motor. Examples of the pipes 28 include hoses through which a solidified material such as cement milk passes through a discharge port (not shown) or hoses through which compressed air or water passes. In this example, the stirring blade 25 is provided with a co-rotation prevention frame 26, and one stirring blade is mounted therein, and two stirring blades are mounted on the upper and lower sides, and all the stirring blades rotate in the same direction. Reference numeral 27 denotes an excavation bit. A solid material discharge port (not shown) is formed in the rod on the back side of the stirring blade 25.

  The tip structure including the stirring blades 25 is not limited to that shown in FIG. 12, and it is possible to omit the rotation of the common rotation prevention frame 26 and to reverse the rotation direction of the upper and lower stirring blades.

  An example of creating a solidified pile will be described using the ground improvement device 50c. The solidification pile creation method of this example is the same as the known solidification pile creation method except that the feeding and winding of the supply source 20b are synchronized in accordance with the penetration and pulling up of the hollow tube 7. That is, while the hollow tube 7 penetrates into the ground, the solidification material is discharged from the solidification material discharge port into the ground in the rotating region of the stirring blade provided radially at the lower portion of the tip coupling portion 2, A solidified pile is created by stirring and mixing.

  The expansion and contraction 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.

  According to the telescopic devices 10, 10a to 10c and the ground improvement devices 50 and 50a to 50c of the present invention, the height of the device from the ground surface relative to the underground penetration length of the unit link member coupling bodies 1A and 1B is the same as that of the conventional leader. It is significantly smaller than the ground improvement device used. For this reason, construction work can be carried out in a place with air space restriction (height restriction) without performing an addition process and an expansion / contraction process. Moreover, even if the addition process is performed, the number of executions of the addition process can be significantly reduced as compared with the conventional case.

  According to the present invention, the time and labor required for the addition can be reduced, and the construction cost can be kept low. Similarly, the time and labor required for the expansion and contraction of the rod can be reduced, the size of the device can be reduced, and the stability of the ground improvement device can be improved.

DESCRIPTION OF SYMBOLS 1A 1st unit link member coupling body 1B 2nd unit link member coupling body 2 Tip coupling | bond part 3a 1st rotation body 3b 2nd rotation body 4 Rotation body drive means 5 Non-connection surface 6 Connection surface 7 Hollow tube 8a, 8b Crimping Device 9a, 9b Support member 10, 10a-10c Telescopic device 11a, 11b Unit link member 12a, 12b Connecting member 13 Crane 50, 50a-50c Ground improvement device

Claims (15)

A first and second unit link member connection formed by sequentially connecting a plurality of unit link members that form a short hollow tube when the inner openings of each other are butted together, using a connection member. A body, and a distal end coupling portion for coupling the distal ends 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, and rotating body driving means for driving the rotating bodies,
The the first and second unit link member connecting member includes a connecting surface to which the connecting member is formed, the non-coupling surface of the coupling member is not formed on the side opposite of the connecting surfaces, respectively, the rotary all SANYO each of the non-coupling surfaces of said fed from the body first and second unit link member connecting member forms a hollow tube in contact with each other,
The ground improvement telescopic device , wherein the plurality of unit link members are rotatably connected to a connecting surface side with the connecting member as an axis .   2. The ground improvement telescopic device according to claim 1, wherein the rotating body is arranged such that the non-connecting surfaces of the unit link member connecting body fed from the rotating body come into contact with each other.   The expansion / contraction device for ground improvement according to claim 1, further comprising: a pressure-bonding unit that presses the non-connecting surfaces of the unit link member connecting body fed from the rotating body so as to contact each other.   The expansion / contraction device for ground improvement according to any one of claims 1 to 3, wherein a non-connection surface of the unit link member connection body forming the hollow tube is sealed.   The expansion / contraction device for ground improvement according to any one of claims 1 to 4, wherein a contact surface on a side where the unit link member connecting body forming the hollow tube is wound up or sent out is sealed. .   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 expansion / contraction device for ground improvement according to any one of claims 1 to 5.   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 device for ground improvement according to any one of claims 1 to 6, wherein a second engagement portion that engages with the engagement 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 expansion device for ground improvement of any one of Claims.   A ground improvement device comprising the ground improvement stretching device according to any one of claims 1 to 8. The tip coupling portion is hollow,
The ground improvement device according to claim 9, further comprising: a ground improvement material input means for supplying or sending a ground improvement material into the hollow tube of the expansion device for ground improvement and the tip coupling portion.   The ground improvement device according to claim 10, wherein the ground improvement material is a prefabricated vertical drain.   The ground improvement according to claim 11, wherein the tip joint portion is a tapered hollow tube, and a prefabricated vertical drain ahead of the tip joint portion is provided with a drain construction tip structure. apparatus.   The ground improvement device according to claim 10, wherein the ground improvement material is a sand pile material.   The ground improvement device according to claim 13, wherein the tip joint portion is a sand pile construction tip structure. One end passed through the hollow tube has a power line or piping connected to a ground source,
The ground improvement device according to claim 9, wherein the tip coupling portion is a drive motor and a stirring blade located on the tip side of the drive motor.

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