JP2006144916A - Sliding steel pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding steel pipe for feeding fluid beyond a telescopic portion. <P>SOLUTION: The sliding steel pipes 35. 36 feed fluid from one side to the other side in the direction of telescopic operation over the telescopic portions formed by a cylinder 10. The plurality of steel pipes 35, 36 different in diameter are laid on each other so that the pipes are kept in air tight conditions by sealing members. One end of the maximum diameter steel pipe 35 and one end of the minimum diameter steel pipe 36 are each connected to one of the head side of a cylinder tube 10b of the cylinder 10 and a piston rod 10a. Thus, the sliding steel pipes 35, 36 are telescopically operated while sliding in the axial direction in linkage with the telescopic operation of the cylinder 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is an apparatus in which a hydraulic motor is integrated with an expansion / contraction mechanism such as a hydraulic cylinder, for example, to supply fluid such as hydraulic fluid to the hydraulic motor from the opposite side beyond the expansion / contraction mechanism. This relates to the sliding steel pipe piping.

  When excavating a vertical pit in the ground, the soil in the casing that has been rotationally pressed into the ground by a tubing device or the like is excavated with a screw, while the vertical soil that has been excavated and retained outside the casing is retained. A mine drilling device is used. Patent Document 1 below discloses such a shaft excavator. FIG. 8 is a view showing a vertical excavation device similar to that described in the same document.

  The vertical excavation apparatus 100 is connected to a screw 102 having a excavation bit 101 at the tip from the bottom, and a drive motor 103 that rotates the screw 102. The screw 102 is in a discharge pipe 104 formed with a length that allows the excavation bit 101 at the tip to come out, and can hold the excavated soil in the discharge pipe 104. . On the other hand, two drive motors 103 are provided symmetrically on the extension of the central axis, and the rotational output from the two drive motors 103 is transmitted to the screw 102 via the gear 105.

A hydraulic cylinder (elevating cylinder) 110 for moving up and down the casing 200 together with the screw 102 is connected to the drive motor 103.
The elevating cylinder 110 is contained in a double pipe composed of an intermediate cylinder 111 and an external cylinder 112, a downward piston rod is axially attached to the intermediate cylinder 111, and a cylinder tube is axially attached to the external cylinder 112. The middle cylinder 111 is connected to the lower drive motor 103, and the outer cylinder 112 is provided with a positioning mechanism for positioning with respect to the casing 200.

In the positioning mechanism, a clamping hydraulic cylinder (positioning cylinder) 115 is pivotally supported on the outer cylinder 112 on the outer cylinder 112, and a wedge-shaped pressing block 116 is pivotally attached to the piston rod facing upward. Yes. A positioning block 117 that is pressed against the inner wall of the casing 200 is provided outside the pressing block 116. In FIG. 8, the positioning release state is shown on the left side of the center line, and the positioning state on the right side of the center line is shown.
The pressing block 116 and the positioning block 117 are connected so that the overlapping tapered surfaces are in sliding contact with each other. A plurality of positioning mechanisms including a positioning cylinder 115, a pressing block 116, and a positioning block 117 are arranged at equal intervals on the circumference.

  The shaft excavator 100 is suspended by connecting a wire from a crane to a bracket 120 of an outer cylinder 112 and inserted into an embedded casing 200. At this time, when the contracting positioning cylinder 115 is extended, the pressing block 116 is raised, and the positioning block 117 is pushed outward accordingly. A plurality of positioning blocks 117 are pressed against the inner wall of the casing 200, and the shaft excavation device 100 is positioned by the frictional force thereof.

Therefore, next, the retracted lifting cylinder 110 is extended, and the drive motor 103 outputs the rotation. The rotating screw 102 descends and excavation is performed by the excavation bit 101 at the lower end. The ground in the casing 200 excavated by the excavating bit 101 relatively moves up the descending screw 102, and the excavated soil is confined in the earth discharging pipe 104 that covers the screw 102. When the excavated soil accumulates in the soil removal pipe 104, the vertical shaft excavator 100 is pulled out of the casing 200. Then, the excavated soil accumulated in the soil removal pipe 104 is discharged by rotating the drive motor 103 in the reverse direction.
Japanese Patent Laying-Open No. 2003-172087 (page 5-6, FIG. 2)

  By the way, in the shaft excavation apparatus 100 described in Patent Document 1, since hydraulic oil is supplied to the drive motor 103, a hydraulic hose is a casing together with a wire for suspending the apparatus, although not shown in FIG. The hydraulic hose is further connected to the drive motor 103 through a space surrounded by the middle cylinder 111 and the outer cylinder 112 that cover the elevating cylinder 110. Such a hydraulic hose has a lifting cylinder 110 that expands and contracts while it is connected to the drive motor 103, and therefore has a length corresponding to the stroke of the lifting cylinder 110 in the middle cylinder 111 and the outer cylinder 112, and the lifting cylinder 110 contracts. When in a state, the inner cylinder 111 and the outer cylinder 112 are bent.

However, for example, in the case of the shaft excavator 100, the lifting cylinder 110 extends about 1.5 m. Therefore, if the hydraulic hose of that length is bent, the hydraulic hose is caught while the lifting cylinder 110 is repeatedly expanded and contracted. There is also a risk. Therefore, as another method, for example, a hose reel may be used so that the hydraulic hose is sent and pulled back in accordance with the expansion and contraction of the elevating cylinder 110. Is difficult to place.
Such a problem is not limited to the illustrated vertical excavation device 100, but is a common problem with a structure in which a fluid is sent beyond the expansion / contraction portion, and therefore a piping structure corresponding to expansion / contraction is desired.

  Then, this invention aims at providing the slide type steel pipe piping for sending a fluid beyond an expansion-contraction part in order to solve this subject.

  The sliding steel pipe piping according to the present invention is for sending a fluid from one side to the other side in the expansion / contraction direction beyond the expansion / contraction part constituted by the cylinder, and a plurality of steel pipes having different diameters are hermetically sealed by a seal member. The one end of the maximum diameter steel pipe and the one end of the minimum diameter steel pipe are connected to either the head side of the cylinder tube of the cylinder or the piston rod, and the cylinder expands and contracts. It is characterized in that it slides in the axial direction in conjunction with the operation and expands and contracts.

Further, in the slide type steel pipe piping according to the present invention, the steel pipe is slid on the inner side by sliding the seal member provided at the end on the outer side steel pipe side with the inner side steel pipe having the smaller diameter inserted in the outer side steel pipe having the larger diameter. It is preferable that the steel pipe slides in the axial direction, the outer steel pipe is fixed to the head side of the cylinder tube, and the inner steel pipe is connected to the piston rod via a bearing arranged concentrically. .
Further, in the sliding steel pipe pipe according to the present invention, the outer steel pipe is connected to a fixed plate having a plurality of ports fixed to the head side of the cylinder tube, and the inner steel pipe is arranged concentrically with the piston rod. It is preferably connected to a movable plate having a plurality of ports provided via a bearing, and a plurality of outer steel pipes and inner steel pipes are preferably connected to the fixed plate and the movable plate.

Therefore, according to the sliding type steel pipe piping of the present invention, the hydraulic oil is supplied to, for example, the hydraulic cylinder beyond the expansion / contraction portion by flowing the fluid through the plurality of steel pipes that slide and extend in conjunction with the expansion / contraction operation of the cylinder. can do. And this slide-type steel pipe piping is a simple structure comprised by an outer side steel pipe and an inner side steel pipe, for example, Comprising: It can be stored compactly also in limited space, such as a shaft excavation apparatus. In addition, a plurality of fluids can be provided around the hydraulic cylinder, and different fluids can be sent over the telescopic part.
In addition, when the hydraulic cylinder is extended, the piston rod may be rotated by an external force. Even in such a case, the rotation of the piston rod is prevented from being transmitted to the sliding steel pipe piping by connecting via a bearing. Thus, the sealing part can be kept airtight.

  Next, an embodiment of a vertical shaft excavator provided with a sliding steel pipe pipe according to the present invention will be described below with reference to the drawings. The slide-type steel pipe piping of this embodiment is incorporated in the same vertical shaft excavator as that described in the conventional example. FIG.1 and FIG.2 is the figure which abbreviate | omitted the screw part about the vertical shaft excavation apparatus of this embodiment inserted in the casing. In particular, FIG. 1 is a view showing an appearance, and FIG. 2 is a cross-sectional view showing the inside.

The vertical shaft excavating apparatus 1 shown in the figure has an expansion / contraction part on the upper side, and a rotation driving part for rotating a screw (not shown) on the lower side. The telescopic part has a hydraulic cylinder (elevating cylinder) 10 disposed on the center line, and the elevating cylinder 10 is covered with an intermediate cylinder 11 and an outer cylinder 12.
The elevating cylinder 10 with the piston rod 10a facing downward has its piston rod 10a axially attached to the middle cylinder 11 side and cylinder tube 10b axially attached to the outer cylinder 12 side. The middle cylinder 11 inserted from the lower side with respect to the outer cylinder 12 is an expansion / contraction member that expands / contracts downward by the expansion / contraction of the lifting cylinder 10.

  In the shaft excavation device 1, the suspension frame 13 is suspended by a wire sent from a crane, and the outer cylinder 12 is fixed to the suspension frame 13. The suspension frame 13 is provided with four hydraulic cylinders (positioning cylinders) 14 around the outer cylinder 12. The positioning cylinders 14 are arranged at equal intervals of 90 degrees, and are suspended with the piston rod 10a facing downward. An elevating frame 15 that moves up and down by the expansion and contraction of the positioning cylinder 14 is fixed to the piston rod protruding downward. The elevating frame 15 is an annular frame through which the outer cylinder 12 penetrates, and a wedge-shaped pressing block 16 is suspended below the elevating frame 15 at a position corresponding to the positioning cylinder 14.

  A positioning block 17 is provided outside the pressing block 16 so as to be slidable in the radial direction and pressed against the inner wall of the casing 200 so as to position the entire shaft excavator 1 so as not to be displaced with respect to the casing 200. It has been. The positioning block 17 is provided on a support base 18 fixed to the lower rotational drive unit side, and when the shaft excavator 1 is inserted through the casing 200, the position is separated from the inner wall of the casing 200 as shown in the figure. It is in. The pressing block 16 and the positioning block 17 are in sliding contact with the overlapping tapered surfaces.

  In the rotary drive unit provided under such an expansion / contraction unit, two drive motors 20 are provided in the case 21 and are arranged at symmetrical positions with respect to the central axis. Although not shown in detail, a rotation transmission mechanism is configured on the rotation shaft of each drive motor 20 so that the rotation is transmitted to the screw via a gear.

  The suspension frame 13 of the shaft excavator 1 is provided with a suspension bracket 25 that connects wires from a crane and a connection base 26 that is formed with a port that connects a hose that flows fluid. The connection base 26 is attached to a fixed plate 31 that constitutes the upper surface of the hanging frame 13. The suspension frame 13 has an annular shape as can be seen from FIG. 2, and the upper surface thereof is closed by a fixed plate 31 to which the elevating cylinder 10 is fixed. The elevating cylinder 10 is provided so as to protrude downward from the suspension frame 13.

Here, FIG. 3 is a view showing the structure of the sliding steel pipe piping according to the present invention provided in the vertical excavation device 1. In this slide type steel pipe piping, hydraulic oil sent from a hose (not shown) connected to the port 26a of the connection base 26 is supplied to the lower drive motor 20 beyond the elevating cylinder 10. .
However, the connection base 26 is configured with a plurality of ports 26a so that fluids other than hydraulic oil can be sent. A plurality of slide-type steel pipes are formed around the elevating cylinder so that fluids other than hydraulic oil can be sent downward beyond the elevating cylinder 10. Examples of the fluid other than the hydraulic oil include cement milk for improving the ground ejected from the screw tip and air for preventing adhesion of soil to the excavation bit.

  As shown in FIG. 3, a fixed plate 31 is screwed to the head side of the cylinder tube 10b of the elevating cylinder 10, and a movable plate 32 is attached to the bracket 19 at the tip on the opposite piston rod 10a side. The piston rod 10 a is pivotally attached to the middle cylinder 11 through a pin by a bracket 19 at the tip, and the middle cylinder 11 is fixed to a case 21 surrounding the drive motor 20. Therefore, the movable plate 32 provided on the bracket 19 moves up and down together with the drive motor 20 in the case 21.

  The sliding steel pipe pipe is provided so as to be supported by the fixed plate 31 and the movable plate 32, and the auxiliary plate 33 fixed to the head side of the cylinder tube 10b. That is, as shown in FIG. 3, the sliding steel pipe pipe is connected to the fixed plate 31 and the auxiliary plate 33 and provided with an outer steel pipe 35, and the inner steel pipe 36 inserted therein is connected to the movable plate 32. Yes.

  3 is a hydraulic pipe for supplying hydraulic oil to the drive motor 20, and one side is a supply side and the other is a discharge side. . The outer steel pipe 35 constituting the hydraulic pipe is connected so that one end thereof is inserted into the port portion of the fixed plate 31, and is connected to the sliding plate 37 fixed to the auxiliary plate 33 on the auxiliary plate 33 side. Yes. Inside the sliding contact tube 37, a plurality of O-rings are fitted as seal members with which the inner steel tube 36 inserted into the outer steel tube 35 comes into sliding contact. A port block 38 is fixed to the movable plate 32, and the inner steel pipe 36 is connected to the port block 38 to be integrated.

  Next, FIG. 4 is a view showing the fixed plate 31, and FIG. 5 is a view showing the auxiliary plate 33. In particular, FIG. 4 is a view as seen from above in FIG. 3. Two hydraulic ports 41 of the hydraulic piping are formed in front, and an air port 42 and other ports 43, which communicate with the air piping for supplying air, 44 is also formed. On the other hand, in the auxiliary plate 33 of FIG. 5 as viewed from the lower side of FIG. 3, two hydraulic through holes 51 for hydraulic piping are formed at positions corresponding to the fixed plate 31, and further, air through holes for air piping are formed. 52 and other through holes 53 and 54 are also formed. Although not shown, a port block 38 is also attached to the movable plate 32 to which the inner steel pipe 36 is connected so as to coincide with the auxiliary plate 33 as shown in FIG.

  The fixed plate 31 is formed with a head side port 45 and a rod side port 46 for supplying hydraulic oil to the elevating cylinder 10. Further, on the fixed plate 31 shown in FIG. 4, bolts 47 for screwing the elevating cylinder 10 are arranged on the same circumference, and further on the outer side, the fixed plate 31 is attached to the hanging frame 13 in four directions. Two bolt holes 48 for fixing are formed.

  Next, FIG. 6 is a view showing a structure of an air pipe configured to be connected to the air ports 42 and 52 shown in FIGS. 4 and 5. The air pipe is connected to the fixed plate 31 and the auxiliary plate 33 and provided with an outer steel pipe 61, and an inner steel pipe 62 inserted therein is connected to the movable plate 32. The outer steel pipe 61 is connected so that one end thereof is inserted into the port portion of the fixed plate 31, and is connected to a sliding contact pipe 63 fixed to the auxiliary plate 33 on the auxiliary plate 33 side. Inside the sliding contact pipe 63, a plurality of O-rings are fitted as seal members with which the inner steel pipe 62 inserted into the outer steel pipe 61 comes into sliding contact. A port block 38 is fixed to the movable plate 32, and an inner steel pipe 62 is connected to the port block 64 to be integrated.

  FIG. 7 is a view showing a hydraulic piping structure for supplying hydraulic oil to the elevating cylinder 10. As described above, the fixed plate 31 is formed with the head-side port 45 and the rod-side port 46 that supply hydraulic oil to the elevating cylinder 10. The head side port 45 formed on the inner side communicates directly with the cylinder tube 10b above the piston, and the rod side port 46 formed on the outer side communicates with the lower side of the piston 10c with a pipe connected thereto.

As can be seen from FIGS. 4 and 5, the sliding steel pipe piping is provided around the lifting cylinder 10 disposed at the center, and the outer steel pipes 35 and 61 are cylinders of the lifting cylinder 10 as shown in FIGS. 3 and 6. It is attached integrally to the tube 10b, and the inner steel pipes 36, 62 are attached via the movable plate 32 so as to follow the piston rod 10a.
By the way, in such a configuration, when the piston rod 10 a is slightly twisted when the elevating cylinder 10 is extended, the inner steel pipe 36 is inclined, and a gap is formed in a seal portion with the outer steel pipe 35. Therefore, in the present embodiment, the movable plate 32 is attached to the piston rod 10a via the bearing 39 installed concentrically with the piston rod 10a so that the rotation of the piston rod 10a is not transmitted to the inner steel pipe 36. A hose 40 connected to the drive motor 20 is connected to the port block 38 of the movable plate 32 as shown in FIG.

Subsequently, in the vertical shaft excavation apparatus 1 of this embodiment provided with such a sliding steel pipe pipe, excavation and soil removal in the casing 200 is performed as follows.
The shaft excavation device 1 is suspended vertically by connecting a wire from a crane to the suspension frame 13 side, and is inserted into a casing 200 that is rotationally press-fitted by a tubing device and embedded in the ground. Although not shown in FIGS. 1 and 2, a screw is connected in the same manner as shown in the conventional example. The screw is rotated by the rotational drive of the drive motor 20 and is lowered by the extension operation of the elevating cylinder 10. Then, the excavation bit at the tip excavates the soil in the casing 200. At this time, the positioning in the casing 200 is performed so that the apparatus does not float due to the reaction force of excavation. And it repeats digging by repeating positioning and the cancellation | release.

  For positioning in the casing 200, when the positioning cylinder 14 is extended, the pressing block 16 is lowered via the lifting frame 15. As a result, the positioning block 17 is pushed outward through the tapered surface in which the output from the positioning cylinder 14 in the downward direction is slidably contacted. Therefore, the positioning block 17 is strongly pressed against the inner surface of the casing 200, and the suspension frame 13 and the outer cylinder 12 are positioned with respect to the casing 200 by the frictional force of the pressing surface. If the elevating cylinder 10 is operated to extend in this state, the piston rod 10a extends to lower the drive motor 20 and the power transmission unit such as the gear below and the screw.

  The elevating cylinder 10 is supplied with hydraulic oil from the head side port 45 shown in FIG. 7, the piston 10c is pressurized from above and descends, and the piston rod 10a extends downward. On the other hand, if hydraulic oil is supplied from the rod side port 46, the piston 10c is pressurized and pushed up from below, and the piston rod 10a rises and contracts into the cylinder tube 10b. However, when the positioning with respect to the casing 200 is canceled at this time, the cylinder tube 10b is lowered because the screw is in the ground, and the positioning mechanism including the outer cylinder 12, the hanging frame 13, the positioning cylinder 14, and the like is lowered. To do. Accordingly, by repeating the expansion and contraction of the elevating cylinder 10 and the positioning of the casing 200, it descends like a scale insect and performs excavation. Since excavated soil accumulates in the excavated pipe by excavation by two expansions / contractions, the vertical excavation device 1 is pulled up from the casing 200 each time and the excavated soil is discharged.

  In excavation in which the elevating cylinder 10 is expanded and contracted in this way, hydraulic oil is supplied to the drive motor 20 beyond the expanded and contracted portion. When the piston rod 10a extends by the elongating operation of the elevating cylinder 10, the inner steel pipes 36, 62 connected via the movable plate 32 are pulled out from the outer steel pipes 35, 61, and conversely, the inner steel pipes 36, 62 are pulled by the retracting operation. It is pushed into the outer steel pipes 35 and 61. The outer steel pipes 35 and 61 and the inner steel pipes 36 and 62 expand and contract in conjunction with the elevating cylinder 10 in this way. Then, the hydraulic oil is supplied to and discharged from the drive motor 20 through the sliding steel pipe pipe composed of the inner steel pipes 36 and 62 and the outer steel pipes 35 and 61 that are expanded and contracted. In addition, air is blown out and cement milk is injected. I will be broken.

  Therefore, the shaft excavation apparatus 1 of this embodiment can send fluids, such as hydraulic oil and air, beyond the expansion-contraction part in which the raising / lowering cylinder 10 was provided by slide-type steel pipe piping 35,36 / 61,62. It became so. And it is the simple structure which mainly consists of the outer side steel pipes 35 and 61 and the inner side steel pipes 36 and 62, It was around the raising / lowering cylinder 10, and was able to be provided compactly in the middle cylinder 11 and the outer cylinder 12. In addition, since a plurality of slide-type steel pipes can be provided, it is possible to send various fluids such as air and cement milk as described above, and the shaft excavation apparatus 1 and other apparatuses can be used in various applications. The response has come to work.

  Further, even if the piston rod 10a is twisted when the elevating cylinder 10 is extended, the rotation of the piston rod 10a is not transmitted to the inner steel pipe 36 because the movable plate 32 is attached to the piston rod 10a via the bearing 39. . Therefore, the inner steel pipe 36 is not inclined, and an airtight state can be maintained without generating a gap in the seal portion with the outer steel pipe 35. Since Japanese soil contains a lot of moisture, the infiltration of muddy water also occurs in the middle cylinder 11 and the outer cylinder 12. In that case, if muddy water or the like enters the hydraulic oil flow path, the hydraulic unit may enter and the valves and pumps may be broken. However, in this embodiment, such a problem does not occur because the seal portion is airtight.

As mentioned above, although one Embodiment was described, this invention is not limited to this, A various change is possible in the range which does not deviate from the meaning.
For example, in the above-described embodiment, the vertical excavation device 1 has been described as an example. However, other devices that need to send fluid beyond the extendable portion may be used.

It is the external view which abbreviate | omitted the screw part about the vertical shaft excavation apparatus of one Embodiment inserted in the casing. It is sectional drawing which abbreviate | omitted the screw part about the vertical shaft excavation apparatus of one Embodiment inserted in the casing. It is sectional drawing which showed the slide type steel pipe piping provided in the vertical shaft excavation apparatus. It is the figure which showed the fixed plate provided in the head side of the hydraulic cylinder. It is the figure which showed the auxiliary | assistant plate provided in the rod side of the hydraulic cylinder. It is sectional drawing which showed the slide type steel pipe piping provided in the vertical shaft excavation apparatus. It is the figure which showed the hydraulic piping structure which supplies hydraulic fluid to a raising / lowering cylinder. It is the figure which showed the conventional vertical shaft excavation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft excavator 10 Hydraulic cylinder 10a Piston rod 10b Cylinder tube 11 Middle cylinder 12 Outer cylinder 14 Chuck cylinder 20 Hydraulic motor 31 Fixed plate 32 Movable plate 33 Auxiliary plate 35 Outer steel pipe 36 Inner steel pipe 200 Casing

Claims (3)

For sending a fluid from one side of the expansion / contraction direction beyond the expansion / contraction part constituted by the cylinder,
A plurality of steel pipes having different diameters are overlapped by a sealing member so that the inside of the pipe is airtight, and one end of the maximum diameter steel pipe and one end of the minimum diameter steel pipe are connected to the head side of the cylinder tube of the cylinder and the piston rod. A slide-type steel pipe that is connected to any one of the cylinders and slides in the axial direction in conjunction with the expansion and contraction operation of the cylinder. In the sliding steel pipe piping according to claim 1,
In the steel pipe, an inner steel pipe with a small diameter is inserted into an outer steel pipe with a large diameter, and the inner steel pipe slides in an axial direction by sliding a seal member provided at an end on the outer steel pipe side. ,
The sliding steel pipe piping is characterized in that the outer steel pipe is fixed to the head side of the cylinder tube, and the inner steel pipe is connected to the piston rod through a bearing arranged concentrically. In the sliding steel pipe piping according to claim 2,
The outer steel pipe is connected to a fixed plate having a plurality of ports fixed to the head side of the cylinder tube, and the inner steel pipe has a plurality of ports provided via bearings arranged concentrically with the piston rod. A slide-type steel pipe piping, which is connected to a movable plate, wherein a plurality of outer steel pipes and inner steel pipes are connected to the fixed plate and the movable plate.

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