JP3173014U - Low head drilling rig - Google Patents

Abstract

An excavation apparatus for driving a casing for a foundation pile in a place where the ceiling height is low, and the low-head drilling apparatus capable of downsizing the entire apparatus and simplifying the structure is provided.
A pair of left and right rails 1 and 1 laid on the ground to be excavated, a device main body 2 formed in a substantially gate-like longitudinal section and capable of traveling in the front-rear direction along the rails 1 and 1; In the apparatus main body 2, an elevating body 3 that elevates and lowers between an upper limit position of the apparatus main body 2 and a required position below the apparatus main body 2 and elevating drive means 4 are provided. Further, the casing rotation driving means and the screw rotation driving means, the short casing 7 that can be added to the connecting portion of the casing rotation driving means, and the screw shaft upper end portion 8b at the connecting portion of the screw rotation driving means. A short screw 8 that can be connected and a suspension means 9 provided on one end side of the apparatus main body 2 are provided, and the apparatus main body 2 is caused to travel between the suspension position and the excavation position.
[Selection] Figure 1

Description

  The present invention relates to a low-headed excavator for driving a casing for a foundation pile into a narrow space such as in a tunnel or under an elevated space.

  As a conventional low head type excavator, for example, there is one described in Patent Document 1 below. The low-headed excavator includes a horizontal base having a pair of left and right movable rails that are disposed on a base machine having an excavation pedestal portion at a predetermined height via a frame and project forward from the excavation pedestal portion. The carriage includes a carriage movably disposed along the extending direction of the movable rail, an actuator for horizontally driving the carriage, and an excavator supported to be lifted and lowered by the carriage, and the carriage supports the excavator to be suspended. In this state, the movable rail can reciprocate between the protruding position of the movable rail and the excavation base.

JP 2010-106615 A

  In the low-headed excavation apparatus described in Patent Document 1, there is a problem that the entire apparatus is considerably enlarged and the structure is complicated and the work is difficult.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a low-headed excavator capable of reducing the size of the entire apparatus, simplifying the structure, and facilitating the operation.

  Means for solving the above problems will be described with reference numerals in the embodiments described later. A low-headed excavator according to claim 1 is a pair of left and right rails 1 laid on the ground. 1, a device main body 2 that is formed in a substantially gate-like longitudinal section by a connecting member 11 that connects the left and right side frame bodies 10 and 10 and the both side frame bodies 10 and 10, and that can travel in the front-rear direction along the rails 1 and 1; A lifting body 3 that moves up and down between an upper limit position in the apparatus main body 2 and a required position below it, a lifting drive means 4 that drives the lifting body 3 up and down, a casing rotation driving means 5 provided on the lifting body 3, and The screw rotation drive means 6, the short casing 7 that can be added to the upper end of the casing is connected to the connection portion 21 of the casing rotation drive means 5, the inserted into the casing 7, and the connection portion 25 of the screw rotation drive means 6. The An extendable short screw 8 to which the Liu shaft upper end 8b is connected, and a suspension means 9 provided on the upper part of the front end side of the apparatus main body 2 are provided. The casing 7 and the screw 8 are connected to the left and right rails 1 by the suspension means 9. , 1 and the hanging position (FIG. 1 (a)), the casing 7 and the screw 8 are respectively connected to the connecting portions 21 and 25 of the rotation driving means 5 and 6 and rotated up and down. The apparatus main body 2 is moved along the rail 1 between the excavation position (FIG. 1 (b)) pushed by means 4 and excavated.

  A second aspect of the present invention provides a low-headed excavation apparatus according to the first aspect, wherein a reaction force receiver 37 that receives an upward reaction force acting on the apparatus main body 2 during ground excavation by the casing 7 and the screw 8 is provided with the apparatus main body 2. It is characterized by being interposed between the rails 1

  According to a third aspect of the present invention, in the low-headed excavation apparatus according to the first or second aspect, the reaction force receiver 38 that receives a reaction force in the rotational direction that acts on the apparatus main body 2 when the ground is excavated by the casing 7 and the screw 8 is provided. It is characterized by being interposed between the left and right side frame 10 of the main body 2 and an external structure such as a tunnel T.

  A fourth aspect of the present invention provides the low-headed excavation apparatus according to any one of the first to third aspects, wherein the screw shaft coupling portion 25 appropriately moves and adjusts the screw shaft coupling portion 25 of the screw rotation driving means 6 with respect to the lifting body 3. It is characterized in that a part vertical direction adjusting means 29 is provided.

  The effect of the invention by the above solution will be described with reference numerals of the embodiments described later. A low-headed excavator of the invention according to claim 1 includes a pair of left and right rails 1 laid on the ground G, 1, a device body 2 having a substantially gate-shaped longitudinal section that can travel along the rails 1, 1, a lifting body 3 that moves up and down between an upper limit position in the device body 2 and a required position therebelow, and a lifting body Elevating and lowering driving means 4 for driving up and down 3, casing rotation driving means 5 and screw rotation driving means 6, short casing 7 that can be added connected to connecting portion 21 of casing rotation driving means 5, and screw rotation driving means 6 A short screw 8 that can be added to the connecting portion 25 and a suspension means 9 provided on one end side of the apparatus main body 2, and the casings 7 and 8 clew are connected to the left and right rails 1 by the suspension means 9. A suspending position where the casing 7 and the screw 8 are respectively connected to the connecting portions 21 and 25 of the rotation driving means 5 and 6 and rotated while being pushed by the lifting and lowering driving means 4 and excavating positions. Therefore, the apparatus main body 2 may be moved along the rail 1 for the shortest distance, so that the casing 7 and the excavation work by the screw 8 can be efficiently performed in a short time. In addition, this low-headed excavator has a simple structure and can be downsized as a whole.

  According to the second aspect of the present invention, the reaction force receiver 37 for receiving the upward reaction force acting on the device main body 2 during ground excavation is interposed between the device main body 2 and the rail 1. In response to the upward reaction force acting, it is possible to effectively prevent the apparatus body 2 from being lifted from the rail 1.

  According to the third aspect of the present invention, the reaction force receiver 38 that receives the reaction force in the rotational direction that acts on the apparatus main body 2 during ground excavation is provided between the left and right side frames 10 of the apparatus main body 2 and external structures such as the tunnel T. By interposing between the two, the reaction force in the rotating direction acting on the device main body 2 is received, and the device main body 2 on the rail 1 is prevented from shaking and rattling, and the device main body 2 can be held in a stable state. .

  According to the fourth aspect of the present invention, the screw shaft connecting portion vertical direction adjusting means 29 for appropriately moving the screw shaft connecting portion 25 of the screw rotation driving means 6 in the vertical direction with respect to the lifting body 3 is provided. By appropriately moving and adjusting the shaft connecting portion 25 in the vertical direction, the screw shaft upper end portion 8b can be quickly and easily connected to the connecting portion 25 of the screw rotation driving means 6, and the screw 8 is connected to the casing 7. It can optionally be advanced or retracted.

FIG. 1 shows a low-headed excavation device according to the present invention, where (a) is a schematic perspective view of a state in which the device main body is in a suspended position, and (b) is a schematic perspective view of a state in which the device is moved from the suspended position to the excavated position. It is. It is the side view which looked at the low head type excavation device from the direction orthogonal to the direction where an apparatus main body moves along a rail. It is a partially omitted partial cross-sectional front view of the low-headed excavator as viewed from the side where the apparatus main body moves along the rail. FIG. 4 is a partially enlarged view of FIG. 3. (a) is a partial cross-sectional front view showing a state where the second stage is added to the first stage casing and the second stage screw shaft is added to the first stage screw (auger head), and (b) is a multistage casing. It is the partial cross section front view which shows the state which added the screw in multiple steps and added the screw in multiple steps.

  A preferred embodiment of the present invention will be described below with reference to the drawings. A low-headed excavation apparatus according to the present invention is laid on a ground G to be excavated as shown in FIGS. A pair of left and right rails 1, 1 and a connecting member 11 connecting the left and right side frame bodies 10, 10 and both side frame bodies 10, 10 are formed to have a substantially gate shape in the longitudinal section. A device body 2 capable of traveling at a high speed, a lifting body 3 that moves up and down between an upper limit position substantially at the upper end level of the device body 2 in the device body 2 and a required position below the device body 2, and driving the lifting body 3 up and down. The lifting / lowering driving means 4, the casing rotation driving means 5 and the screw rotation driving means 6 provided on the lifting / lowering body, and the connecting portion 21 of the casing rotation driving means 5 are detachably connected to the upper end portion 7a of the casing 7. Possible short case 7, an insertable short screw 8 that is inserted into the casing 7, and the upper end 8 b of the screw shaft 8 a is detachably connected to the connecting portion 25 of the screw rotation driving means 6, and the front end side of the apparatus main body 2 The suspension means 9 is provided so as to protrude from the upper part.

  Describing in more detail the structure of this low-headed excavator, as can be seen from FIG. 1, the apparatus body 2 is connected as a connecting frame 11 that connects the left and right side frames 10, 10 and the both side frames 10, 10. The frame 11a, 11b, 11c has a vertical cross section formed in a substantially gate shape, the bottom side of the apparatus body 2 is formed in a substantially U shape in plan view with the front end side of the apparatus body 2 opened, and the upper side is a rectangular frame shape. Is formed. Each side frame 10 is integrally framed by a lower frame 10a, an upper frame 10b, a front eave frame 10c, and a rear eave frame 10d, and wheels 12 are attached to the lower surfaces of both front and rear ends of the lower frame 10a. The rear end portions of the lower frames 10a, 10a are connected by a connecting frame 11c, and the front and rear end portions of the upper frames 10b, 10b are connected by the front and rear connecting frames 11a, 11b. As shown in FIGS. 2 and 3, the wheel 12 is pivotally attached to a bracket 19 provided on the lower surface side of both end portions of the lower frame 10 a. Although this apparatus main body 2 is not provided with a wheel drive device and an operator pushes it along the rails 1 and 1, it may be provided with a drive device so as to automatically run.

  The elevating drive means 4 that elevates and lowers the elevating body 3 is provided on each of the left and right side frames 10 and 10 of the apparatus main body 2 so as to sandwich the elevating body 3 from both the left and right sides. As shown in FIG. A chain 15 is hung on sprockets 13 and 14 pivotally attached to the upper and lower portions of the side frame 10, and the lower sprocket 14 is rotated in the forward or reverse direction by the drive motor 16 shown in FIG. 2 to drive the chain 15. As a result, the elevating body 3 is raised or lowered via the connecting member 17 provided on the chain 15, and a pushing force is applied to the casing 7 and the screw 8 particularly during the descent drive. 1 to 3, reference numeral 18 denotes a cover frame of the elevating drive means 4.

  As shown in FIG. 3 and FIG. 4, the casing rotation driving means 5 includes a large-diameter ring-shaped internal gear 20 that is rotatably attached to the elevating body 3, and a concentric shape below the internal gear 20. And a large-diameter ring-shaped casing connecting portion 21 for connecting the casing 7 by inserting an upper end portion 7a of the casing 7 and inserting a connecting pin (not shown), and an internal gear 20. A drive gear 22 that is inscribed in mesh with the drive gear 22 is attached to the output shaft 23o, and includes a forward / reverse rotation motor 23 that is installed in the elevating body 3 so as to rotationally drive the drive gear 22.

  As can be seen from FIGS. 3 and 4, the screw rotation driving means 6 includes a ring-shaped internal gear 24 that is rotatably attached to the elevating body 3, and a central position of the internal gear 24, and the upper end of the screw shaft 8 a. A short cylindrical screw shaft coupling portion 25 that couples the screw shaft 8a by inserting a coupling pin (not shown), and the screw shaft coupling portion 25 and the internal gear 24 are integrally coupled. A connecting gear 26 and a drive gear 27 inscribed in mesh with the internal gear 24 are attached to an output shaft 28o, and a forward / reverse rotation motor 28 installed on the elevating body 3 so as to rotationally drive the drive gear 27. Consists of.

  Further, the lifting body 3 is provided with a screw shaft connecting portion vertical direction adjusting means 29 for moving and adjusting the screw shaft connecting portion 25 of the screw rotation driving means 6 in the vertical direction. In providing this adjusting means 29, as shown in FIG. 4 in which a part of FIG. 3 is enlarged, the disk-shaped bottom wall 30a of the inner cylinder 30 comprising the disk-shaped bottom wall 30a and the short cylindrical peripheral wall 30b is formed. An annular bearing member 31 that rotatably supports the internal gear 24 of the screw rotation driving means 6 is fixed to the peripheral surface of the lower surface, and the output of the motor 28 installed on the bottom wall 30a of the inner cylinder 30 is fixed to the internal gear 24. The drive gear 27 attached to the shaft 28o is engaged, and the cylinder tube 32a of the vertical drive cylinder 32 is passed through the center portion of the bottom wall 30a, and a flange 32o protruding integrally with the cylinder tube 32a is connected to the bottom wall. Secure to 30a with bolts. On the other hand, the outer cylinder 33 is composed of a short cylindrical peripheral wall 33a and a disk-shaped upper wall 33b. The peripheral wall 33a is fixed to the main body 3a of the elevating body 3, and the annular support member 31 is placed on the peripheral wall 33a. And the upper end of the piston rod 32b of the vertical drive cylinder 32 is connected to the center of the upper wall 33b via a bracket 34. In the cylinder 32, the cylinder tube 32a moves up and down while the piston rod 32b is fixed.

  In FIG. 4, reference numeral 30 c denotes an engaging protrusion provided in the axial direction on the outer peripheral surface of the peripheral wall 30 b of the inner cylinder 30, and an engagement provided in the axial direction on the inner peripheral side of the peripheral wall 33 a of the outer cylinder 33. It engages with the concave portion 33c so as to be slidable in the vertical direction. The engaging convex portion 30c and the engaging concave portion 33c guide the inner cylinder 30 relative to the outer cylinder 33 so as to be slidable in the vertical direction. The guide means is configured. Reference numeral 35 denotes an annular support member that rotatably supports the internal gear 20 of the casing rotation driving means 5 and is integrally fixed to the main body 3a side of the elevating body 3.

  Therefore, in the screw shaft connecting portion vertical direction adjusting means 29, when the vertical driving cylinder 32 is extended from the contracted state as shown by the solid line in FIG. 4, the screw shaft connecting portion 25 is shown by the phantom line in FIG. And move downward with respect to the casing connecting portion 21 in the fixed position. That is, when the cylinder tube 32a is moved downward by the extension operation of the cylinder 32, the peripheral wall 33a of the inner cylinder 30 is moved down along the inner peripheral surface of the peripheral wall 33a of the outer cylinder 33, so that it is fixed to the bottom wall 30a of the inner cylinder 30. The formed annular bearing member 31, the inner gear 24 rotatably supported on the bearing member 31, and the connecting member 26 integrally connected to the inner gear 24 are moved down to form an integral part with the connecting member 26. The screw shaft connecting portion 25 moves downward. Further, when the cylinder tube 32a moves up due to the contraction operation of the cylinder 32, the inner cylinder 30 moves up, so that the annular support member 31, the internal gear 24 and the connecting member 26 move up, and the screw shaft connecting portion 25 moves up. Move. Accordingly, the screw shaft connecting portion 25 can be rotationally driven by the screw rotation driving means 6 at an arbitrary position moved up and down as described above.

  Further, as shown in FIG. 2, the suspension means 9 provided on the upper end side of the apparatus main body 2 has a chain block 42 attached to the front end portion of the attachment arm 41 provided to project from the upper portion of the front end side of the apparatus main body 2. A hole or screw provided with one end of one or more wires 43 on the hook 42c of the chain 42b extending from the block main body 42a and the other end provided at a required position of the upper end 7a of the casing 7 Suspension is performed by hooking in the hole of the shaft upper end 8b. The suspension means 9 shown here consists of a chain block, but in addition to this, a winch or a hydraulic cylinder can be used. In the case of a hydraulic cylinder, use it sideways.

  As shown in FIG. 5, the casing 7 is composed of a short casing having an outer diameter of 2400 mm and a length of 1300 to 1400 mm, for example. The casing 7 used first (shown as 7o as a preceding casing) is: An excavation blade 35 is formed at the tip, and the upper end 7a is fitted into the lower end 7b of the second and subsequent succeeding casings 7 and is connected by a connecting pin (not shown). The first screw 8 is composed of an auger head for preceding excavation as shown in FIG. 5, and an upper end portion (small diameter shaft portion) 8b of the screw shaft 8a is provided in a lower end portion of the subsequent screw shaft 8a. The fitting hole 8c is fitted and connected by a connecting pin (not shown). An excavation bit 36 is provided at the screw tip of the auger head 8.

  As schematically shown in FIG. 2, a reaction force receiver 37 that receives an upward reaction force that acts on the apparatus main body 2 when excavating the ground by the casing 7 and the screw 8 is interposed between the apparatus main body 2 and the rail 1. Further, as schematically shown in FIG. 3, a casing 7 and a screw 8 that act on the apparatus main body 2 when excavating the ground with the casing 7 and the screw 8 are provided between the left and right side frames 10 of the apparatus main body 2 and the inner wall of the tunnel T. A reaction force receiver 38 that receives a reaction force in the rotation direction is interposed.

  As the reaction force receiver 37, for example, a clamp or the like that holds and fixes each side frame 10 of the apparatus main body 2 and the rail 1 can be used. Further, as shown in FIG. 3, the reaction force receiver 38 pivotally attaches the base end portion of the mounting arm 39 to the required position on the outer surface side of the lower frame 10 a forming each side frame 10 of the apparatus main body 2. In addition to being able to hold the position in a horizontal action posture and a retracting posture that stands up and stands up from this, a contact piece 40 is pivotally attached to the tip of the attachment arm 39, and the attachment arm 39 is shown as a solid line when not excavated. As shown in the figure, the casing 7 stands up and is held in a retracted position, the mounting arm 39 is tilted during excavation, and the contact piece 40 is pressed against, for example, the inner wall of the tunnel T to act on the apparatus main body 2 during excavation of the ground. And the reaction force in the rotational direction of the screw 8 can be received.

  Next, a description will be given of excavation work in a narrow space with use of the low-headed excavator configured as described above.

  First, as shown in FIG. 1A, the apparatus main body 2 is moved so that the front end side of the apparatus main body 2 is located close to the required excavation point between the rails 1 and 1, and the excavation point includes For example, in case of tunnel construction, the short casing 7 and the short screw 8 are carried by an appropriate traveling carriage that travels on the rails 1 and 1 and in the case of underpass construction by a trailer or the like. The casing 7 and the screw 8 are suspended at a predetermined position (hanging position) as shown in FIG.

  If the casing 7 and the screw 8 are suspended at predetermined positions by the suspension means 9, the apparatus main body 2 is moved along the rails 1 and 1 from the suspension position shown in FIG. 1A to the excavation position shown in FIG. (The casing 7 and the screw 8 are connected to the connecting portions 21 and 25 of the rotation driving means 5 and 6, respectively, and moved to the position where the casing 7 and the screw 8 are pushed by the lifting and lowering driving means 4 for excavation) and inserted into the casing 7 and this. The screw 8 is concentrically positioned below the casing connecting portion 21 and the screw shaft connecting portion 25 in the casing rotation driving means 5 of the apparatus main body 2, and the screw shaft upper end portion 8b of the screw 8 (auger head) is first placed. The screw shaft connecting portion 25 is fitted and pinned. In this connection, as shown in FIG. 3, the screw shaft connecting portion 25 is moved downward from the position indicated by the solid line in FIG. Fit and pin. Thereafter, the upper end portion 7a of the casing 7 is connected to the casing connecting portion 21 of the casing rotation driving means 5. In this connection, the lifting and lowering body 3 is moved downward from the state shown in FIG. It is fitted on the part 21 and pinned.

  With the apparatus main body 2 placed at the excavation position as shown in FIG. 1B as described above, the upper end portion 7a of the first-stage short casing 7 (preceding casing 7o) is connected to the casing rotation driving means 5 in the casing connection. After connecting the screw shaft upper end portion 8b of the first stage short screw 8 (auger head) inserted into the preceding casing 7o to the screw shaft connecting portion 25 of the screw rotation driving means 6, While the casing 7o and the auger head 8 are rotationally driven by the casing rotation driving means 5 and the screw rotation driving means 6, the casing 7o penetrates into the ground by driving the elevating body 3 downward by the elevating driving means 4, and the auger head 8 excavates the soil in the casing 7. At this time, the earth and sand excavated by the auger head 8 is pulled up by the screw action of the auger head 8 and discharged from the upper end of the casing 7o.

  During the operation at the excavation position shown in FIG. 1B, the apparatus main body 2 is fixed on the rails 1 and 1 by the reaction force receivers 37 and 38. That is, as shown schematically in FIG. 2, the reaction force receiver 37 is interposed between the apparatus main body 2 and the rail 1, and the upward reaction force acting on the apparatus main body 2 when excavating the ground by the casing 7 and the screw 8. By receiving, the apparatus main body 2 is prevented from being lifted from the rail 1 laid on the ground G. Further, as schematically shown in FIG. 3, the reaction force receiver 38, for example, in excavation work in a tunnel, moves the mounting arm 39 from the solid line illustrated position to the virtual line illustrated position in FIG. By pressing against the inner wall, the reaction force in the rotational direction acting on the device main body 2 is received, and the device main body 2 on the rail 1 can be prevented from shaking and rattling, and the device main body 2 can be held in a stable state.

  If the casing 7o and the auger head 8 are excavated to the position indicated by the imaginary line on the right side of the center line in FIG. 3, the drive by the elevating drive means 4 is stopped and the casing rotation drive means 5 and screw rotation drive are stopped. The drive of the means 6 is stopped, and the connection of the casing 7 and the screw shaft 8a to the connecting portions 21 and 25 of the casing rotation drive means 5 and the screw rotation drive means 6 is released, respectively, and After returning to the position, the apparatus body 2 is moved along the rails 1 and 1 from the excavation position shown in FIG. 1 (b) to the hanging position shown in FIG. 1 (a). The second-stage casing 7 and the second-stage screw shaft 8a are appropriately suspended by the suspending means 9, and are fitted to the lower end of the second-stage screw shaft 8a. After the hole 8c (see FIG. 5) is fitted and pinned to the upper end 8b of the screw shaft 8a of the auger head 8, the lower end 7b of the second-stage casing 7 is connected to the upper end of the first-stage casing 7o (preceding casing). It is fitted to the portion 7a and pinned, and the first and second stage screw shafts 8a and the casing are added to obtain a state as shown in FIG. 5 (a).

  As described above, after the screw shaft 8a and the casing are added using the suspension means 9 at the position where the apparatus body 2 is suspended, the apparatus body 2 is moved along the rails 1 and 1 along the rails 1 and 1 in FIG. The upper end portion 7a of the second-stage casing 7 is moved from the suspension position shown in (a) to the excavation position shown in (b) so that the upper end portion 7a of the second-stage casing 7 is moved to the casing connection portion 21 of the casing rotation driving means 5 in the second-stage. The upper end portion 8 b of the eye screw shaft 8 a is connected to the screw shaft connecting portion 25 of the screw rotation driving means 6. This connection work method is the same as that in the first stage described above.

  The upper end portion 7a of the second stage casing 7 is connected to the casing connecting portion 21 of the casing rotation driving means 5, and the upper end portion 8b of the second stage screw shaft 8a is connected to the screw shaft connecting portion 25 of the screw rotation driving means 6. Thereafter, as in the case of the first stage described above, the elevating body 3 is lowered by the elevating drive means 4 while rotating the casing and the auger head 8 by the casing rotation drive means 5 and the screw rotation drive means 6, thereby the casing. 7 penetrates into the ground G, and the auger head 8 excavates the soil in the casing 7.

  Thereafter, by repeating the same operation as described above, a plurality of the added casings 7 are buried in the ground to a predetermined depth, and the soil in the casing 7 in the casing 7 is excavated. Also, the earth and sand excavated by the first stage screw 8 (auger head) is pushed up by the screw 8 (auger head) and discharged onto the ground G.

  According to the low-headed excavation apparatus described above, this apparatus includes a pair of left and right rails 1, 1 laid on the ground G, and a substantially gate-shaped longitudinal section capable of traveling in the front-rear direction along the rails 1, 1. Apparatus body 2, elevating body 3 that moves up and down between the upper limit position in apparatus body 1 and a required position below apparatus body 2, elevating drive means 4, casing rotation drive means 5, and screw rotation drive. An addable short casing 7 in which the upper end of the casing is connected to the connecting part 21 of the casing rotation driving means 5 and the upper end 8b of the screw shaft connected to the connecting part 25 of the screw rotating driving means 6 can be added. A short screw 8 and a suspending means 9 provided on one end side of the apparatus main body 2, and the casing 7 and 8 clew are moved to a required place between the left and right rails 1 and 1 by the suspending means 9. The main body of the apparatus between the suspended position and the excavating position where the casing 7 and the screw 8 are rotated by being connected to the connecting portions 21 and 25 of the rotational driving means 5 and 6 and pushed by the ascending / descending drive means 4. 2 only needs to be moved along the rail 1 for the shortest distance, the burying of the casing 7 and the excavation work by the screw 8 can be efficiently performed in a short time. In addition, this low-headed excavator has a simple structure and can be downsized as a whole.

  Further, since the reaction force receiver 37 that receives the upward reaction force acting on the apparatus main body 2 during ground excavation is interposed between the apparatus main body 2 and the rail 1, it is effective to lift the apparatus main body 2 from the rail 1 Can be prevented. Further, in excavation work in the tunnel T, the reaction force receiver 38 that receives the reaction force is interposed between the left and right side frames 10 of the apparatus main body 2 and the inner wall of the tunnel T of the tunnel T, whereby the apparatus By receiving the reaction force in the rotational direction acting on the main body 2, the apparatus main body 2 on the rail 1 can be prevented from shaking and rattling, and the apparatus main body 2 can be held in a stable state.

  In addition, since the screw shaft coupling portion vertical direction adjusting means 29 for appropriately moving and adjusting the screw shaft coupling portion 25 of the screw rotation driving means 6 in the vertical direction with respect to the lifting body 3 is provided, the coupling portion 25 of the screw rotation driving means 6 is provided. The screw shaft upper end 8b can be quickly and easily connected to the casing 7, and the screw 8 can be arbitrarily advanced or retracted relative to the casing 7. 5 (a) and 5 (b), the screw 8 (auger head) is in a position retracted to the inside of the first stage (lowermost stage) casing 7. By operating, the screw 8 (auger head) can be set at a position preceding the first (lowermost) casing 7 downward.

DESCRIPTION OF SYMBOLS 1 Rail 2 Apparatus main body 3 Lifting body 4 Lifting drive means 5 Casing rotation drive means 6 Screw rotation drive means 7, 7o Casing 8 Screw (auger head)
9 Lifting means 10 Side frame 11 of apparatus body Connecting member 21 Casing connecting portion 25 Screw shaft connecting portion 29 Screw shaft connecting portion vertical direction adjusting means 37, 38 Reaction force receiving

Claims (4)

  A device main body, which is formed in a substantially portal shape with a pair of left and right rails laid on the ground, and a connecting member that connects the left and right side frame bodies and both side frame bodies, and can travel in the front-rear direction along the rails, and the apparatus main body Elevating body that moves up and down between the upper limit position in the inside and a required position below it, elevating drive means for elevating the elevating body, casing rotation driving means and screw rotation driving means provided on the elevating body, and casing rotation An addable short casing in which the upper end of the casing is connected to the connecting part of the driving means, and a short screw that can be added in the upper part of the screw shaft inserted into the casing and connected to the connecting part of the screw rotation driving means, Suspension means provided on the upper part of the front end of the main body of the device, and the casing and screw are suspended at the required location between the left and right rails by the suspension means. Low space that moves the device main body along the rail between the suspension position and the excavation position where the casing and screw are respectively connected to the connecting portion of the rotation drive means and rotated while being pushed by the lift drive means Head drilling rig.   2. The low-headed excavation device according to claim 1, wherein a reaction force receiver that receives an upward reaction force acting on the device main body during ground excavation by the casing and the screw is interposed between the device main body and the rail.   A reaction force receiver that receives a reaction force in a rotating direction that acts on an apparatus main body during ground excavation by the casing and the screw is interposed between a left and right side frame of the apparatus main body and an external structure such as a tunnel. The low-headed excavator according to 1 or 2.   The low-headed excavator according to any one of claims 1 to 3, further comprising a screw shaft connecting portion vertical direction adjusting means for moving and adjusting the screw shaft connecting portion of the screw rotation driving means in the vertical direction with respect to the lifting body.

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