JP2019039261A - Concrete distributor - Google Patents

Abstract

To provide a concrete distributor capable of widening a range of a discharge position of concrete in a working space of a low head height.SOLUTION: A concrete distributor is provided with: swivel base 2 having a first swing device 9 pivotable around a first swing axis extending in a vertical direction; a boom member 3 of which one end is supported by said first swing device 9 and having a plurality of arm 11, 12 disposed pivotably each other in a horizontal plane by a second swing device and in which the plurality of arm 11, 12 are coupled in parallel each other by the second swing axis 14 extending in a vertical direction; a concrete supply tube 4 having a fitting member 22, 23 with a rotation center corresponding to a rotation center of the first swing device 9 and the second swing device 14, and supported by the boom member 3; and a discharge tube 5 connected to a tip of the concrete supply tube 4 and configured to be movable in a vertical direction within a vertical plane with a nozzle rotation axis extending in a horizontal direction as a center.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a concrete distributor for placing concrete mainly in a low-headed work site such as tunnel construction.

  Conventionally, when concrete is placed using a concrete distributor, the construction area is divided into fixed placement blocks, and various hydraulic concrete distributors with movable booms equipped with concrete pipes attached to concrete pumps are used. Therefore, it is common to construct each placement block. The concrete distributor used in that case is disclosed in Patent Documents 1 to 3, for example.

  The concrete distributors described in Patent Documents 1 to 3 are configured to feed concrete through a feed pipe for feeding concrete and to discharge the concrete from a nozzle provided at the tip of the feed pipe.

  Distributors described in each of the above patent documents include a boom that supports a feeding pipe in order to place the nozzle at a predetermined position, and can make the inside of the movable range of the boom a target position where concrete is discharged.

  In the distributor, the boom is supported by the support base so as to be able to turn, and the target position can be changed from the turn center to the rotation direction by turning the boom around the turn center of the support base. Further, the boom has a configuration in which the first and second booms are combined so as to be bent in the vertical direction.

  In addition, since the first boom is provided on the support base so that the elevation angle can be changed, by adjusting the bending angle of the first and second booms and the elevation angle of the first boom, the pivoting center of the support base is changed in the radial direction. The target position can be changed.

  That is, the concrete distributor described in Patent Documents 1 to 3 adjusts the bending angle of the boom and the turning angle with respect to the support base, thereby setting the target position for discharging concrete to an arbitrary position corresponding to the length of the boom. Can be moved.

JP-A-8-21092 JP-A-9-177323 Japanese Patent Laid-Open No. 11-311025

  However, the distributors described in Patent Documents 1 to 3 having the above-described boom configuration change the target position of the nozzle by changing the elevation angle and the vertical bending angle of the boom. When the position was set, it was necessary to increase the elevation angle of the boom and lift the boom.

  For this reason, in a low-altitude working space such as in a tunnel, there was a problem that the boom could not be lifted high, concrete could not be discharged to a place close to the support base, and the target position range was small. .

  For this reason, depending on the target position for discharging concrete, it is necessary to move the support base, which requires a lot of work.

  Therefore, the technical problem to be solved by the present invention is to provide a concrete distributor.

  In order to solve the above technical problem, the present invention provides a concrete distributor having the following configuration.

The concrete distributor includes a swivel base having a first swivel device that is rotatable around a first swivel axis extending in a vertical direction;
One end is supported by the first swivel device, and has a plurality of arms arranged to be rotatable with respect to each other in a horizontal plane by a second swivel device that is rotatable around a second swivel axis, and extends in the vertical direction. A boom member in which the plurality of arms are connected in parallel to each other by a second pivot axis;
A concrete feed pipe having a joint member having a rotation center coinciding with the rotation center of the first swivel shaft and the second swivel shaft, and supported by the boom member;
A discharge pipe that communicates with the tip of the concrete feed pipe and is configured to be movable in the vertical direction within a vertical plane around a nozzle rotation axis extending in the horizontal direction;
It is characterized by providing.

In the above configuration, the arm of the boom member is
A first arm supported in a substantially horizontal direction on the swivel;
It is preferable that the second arm is provided around the second pivot axis so as to be rotatable in a horizontal plane with respect to the first arm.

  The said structure WHEREIN: It is preferable that a said 2nd arm is equipped with a counterweight in the edge part side which opposes the said discharge piping with respect to the said 2nd turning axis.

  The discharge pipe is provided at the other end of the boom member, and can be configured to communicate with the concrete feed pipe via a nozzle joint member whose rotation center coincides with the nozzle rotation shaft.

  In addition, the boom member includes the first arm and at least two second arms, and the second arms can be connected so as to be arranged in the length direction by the second turning device. .

  According to the present invention, the boom members supported in the horizontal direction by the first swivel device of the swivel base are arranged in parallel with each other, and the boom members as a whole are arranged as a whole by the arms arranged to be rotatable with respect to each other in a horizontal plane. It is possible to turn in a horizontal plane around the first turning axis and the second turning axis. Therefore, it is also possible to arrange the discharge pipe near the first turning axis without changing the elevation angle of the boom member, and the concrete discharge position can be set in a wide range in the work area with a low head. .

  In addition, since the discharge pipe that can move in the vertical direction is provided at the tip of the boom member, if the discharge height of the concrete is away from the height position where the boom member exists, the height is adjusted by the discharge pipe. Can do. Thereby, for example, when the discharge position exists below the boom member, it is not necessary to drop the concrete from a high position, and the problem of eliminating the cause of separation of the solid component and the liquid component of the concrete can be solved. it can.

  The boom member is composed of a first arm supported by the swivel base and a second arm provided on the second swivel shaft provided on the first arm, and a counterweight is provided on the second arm. By reducing the lateral moment of the two arms, the lateral force applied to the swivel can be reduced.

It is a side view showing the whole concrete distributor composition concerning a 1st embodiment of the present invention. It is a top view of the concrete distributor of FIG. It is a schematic diagram which shows the cross-section of the tunnel in which the concrete distributor of FIG. 1 is used. It is a figure which shows typically the state which has arrange | positioned discharge piping in the vicinity of the swivel using the concrete distributor of FIG. It is a side view top view which shows the whole structure of the concrete distributor which concerns on 2nd Embodiment of this invention. It is a side view of the concrete distributor of FIG. It is a top view of the work pier in which the concrete distributor of FIG. 5 is provided. It is a figure which shows typically the state of expansion-contraction of the concrete supply piping accompanying the movement of the swivel of the concrete distributor of FIG. It is a side view which shows the whole concrete distributor structure concerning 3rd Embodiment of this invention.

(First embodiment)
Hereinafter, a concrete distributor according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an overall configuration of a concrete distributor according to a first embodiment of the present invention. FIG. 2 is a plan view of the concrete distributor of FIG.

  As shown in FIGS. 1 and 3, the concrete distributor 1 according to the present embodiment is suitably used in a low-altitude work area such as a tunnel. As shown in FIG. 3, a tunnel 100 as an example of a work area is divided into left and right sides with respect to a road center 101 of the tunnel 100, and inverted concrete 102 is placed on the bottom surface. The concrete distributor 1 according to the present embodiment is used in this invert concrete placing operation.

  After excavation work, the tunnel 100 is divided into an upper side surface and a bottom surface and sprayed concrete 103a, 103b is applied, and the invert concrete 102 is placed separately from the bottom surface of the sprayed concrete 103b. Moreover, the lining concrete 104 is provided on the surface of the sprayed concrete on the upper side.

  Above the inverter concrete 102, there are provided a central drain pipe 105a extending in the length direction of the tunnel and a transverse drain pipe 105b communicating with the central drain pipe from a drain outlet (not shown) provided on the side. The pipes 105a and 105b are embedded in the embedded concrete 106. The concrete distributor 1 according to this embodiment can also be used for placing the buried concrete 106.

  As shown in FIGS. 1 and 2, the concrete distributor 1 according to this embodiment includes a swivel base 2, a boom member 3, a concrete feed pipe 4, and a discharge pipe 5.

  The swivel base 2 is a member that is placed and fixed on the bottom surface of the tunnel 100 and supports the boom member 3. The swivel base 2 comprises a base body 6, wheels 7 for movement, and an outrigger 8 for fixing to the ground. A first turning device 9 that supports the boom member 3 is provided on the upper surface of the base body 6.

  The first turning device 9 rotates around the first turning shaft 10 extending in the vertical direction, and the concrete feed pipe 4 communicates with the inside. The concrete feed pipe 4 communicates with the inside of the first turning device 9 so as to penetrate in the vertical direction so as to coincide with the rotation center of the first turning shaft 10, and the first turning by the first joint member 22 as will be described later. The angle can be freely adjusted according to the rotation of the shaft 10.

  The first turning device 9 includes a motor 9a for rotating the first turning shaft 10, and the direction of the boom member 3 can be changed to an arbitrary angle.

The boom member 3 includes a first arm 11 fixed to the first turning device 9 and a second arm 12 rotatably provided at the tip of the first arm 11. In the present embodiment, the first arm 11 is configured to be longer than the total length of the second arm 12 and the discharge pipe 5.
The second arm 12 is disposed on the lower side of the first arm by a second turning device 13 provided at the tip of the first arm, and can be rotated with respect to the first arm 11 by the second turning device 13. It has become.

  The second turning device 13 can turn around the second turning shaft 14 extending in the vertical direction, and the concrete feeding pipe 4 communicates with the inside. The concrete feed pipe 4 communicates with the inside of the second turning device 9 so as to pass through in the vertical direction so as to coincide with the center of rotation of the second turning shaft 14, and the second turning by the second joint member 23 as will be described later. The angle can be freely adjusted according to the rotation of the shaft 14.

  Since the first arm 11 and the second arm 12 are rotatably connected by the second turning device 13 extending in the vertical direction, the first arm 11 and the second arm 12 are arranged in parallel to each other and are rotatable in a horizontal plane.

  The second turning device 13 includes a motor 13a for rotating around the second turning shaft 14, and the direction of the second arm 12 can be changed to an arbitrary angle.

  Counter weights 15 and 16 are provided on the first arm 11 and the second arm 12, respectively. The counterweight 15 of the first arm 11 is provided on the opposite side of the tip of the first arm with respect to the first turning device 9, and the entire boom member 3 is rotated in the left-right direction as shown in FIG. The lateral moment applied to the swivel 2 is reduced. Since the counterweights 15 and 16 are provided by support members that can be expanded and contracted from the ends of the first arm and the second arm by a driving device (not shown), the positions from the arm ends can be changed. Thereby, the position can be adjusted according to the direction of a 1st arm and a 2nd arm.

  The counterweight 16 of the second arm 12 is provided on the side opposite to the tip of the second arm with respect to the second turning device 13, and the second arm 12 rotates in the left-right direction as shown in FIG. The moment in the lateral twist direction applied to the first arm 11 is reduced.

  A third turning device 17 for moving the discharge pipe 5 up and down around a nozzle rotation shaft 18 extending in the horizontal direction is provided at the tip of the second arm 12. The third turning device 17 is provided with a nozzle rotating shaft 18 extending in the horizontal direction, and the concrete feed pipe 4 communicates with the inside. The concrete feed pipe 4 communicates with the inside of the third turning device 17 so as to penetrate in the horizontal direction so as to coincide with the rotation center of the nozzle rotation shaft 18, and the nozzle rotation shaft 18 is connected by the third joint member 24 as will be described later. The angle can be freely adjusted according to the rotation of the lens.

  The third turning device 17 includes a driving device 19 for rotating the nozzle rotation shaft 18. In this embodiment, the drive device 19 includes an extendable cylinder 19a. By operating the drive lever 19b provided in the discharge pipe 5 by expanding and contracting the cylinder 19a, the discharge pipe 5 is connected to the nozzle rotation shaft 18. Rotate around and up and down.

  The discharge pipe 5 includes a feed pipe support arm 20 connected to the third turning device 17 and a discharge portion 21 supported by the feed pipe support arm 20. The feed pipe support arm 20 is rotationally driven in the vertical direction by the rotational drive of the third turning device 17. The discharge part 21 is provided in the front-end | tip of the concrete supply piping 4, and discharges the concrete supplied from the front-end | tip.

  The concrete feed pipe 4 feeds concrete sent from a concrete feed pump (not shown) to the nozzle portion 21 of the discharge pipe 5. The concrete feed pipe 4 is bent upward in the vertical direction from the lower side of the swivel base 2 from the concrete feed pump, and passes through the first swivel device 9 upward in the vertical direction. In the first turning device 9, the first turning member 22 can rotate around the first turning shaft 10. Above the first turning device 9, it is bent in the horizontal direction along the first arm 11, supported by the first arm 11, and extended toward the tip side of the first arm 11.

  To the second turning device 13 provided at the tip of the first arm 11, the concrete feed pipe 4 is bent downward and passes through the second turning device 13 downward in the vertical direction. Within the second turning device 13, the second turning member 23 can rotate around the second turning shaft 14. Below the second turning device 13, it is bent in the horizontal direction along the second arm 12, and extends along the second arm 12 to the tip side of the second arm 12.

  As shown in FIG. 2, the concrete feed pipe 4 extends to the side of the second arm along the second arm 12 and bends in the horizontal direction so as to be orthogonal to the extending direction of the second arm at the tip side. Then, it passes through the third turning device 17 in the horizontal direction. In the third turning device 17, the third joint member 24 can rotate around the nozzle rotation shaft 18. At the side of the third swivel device 17, the feed pipe support arm 20 is bent in the extending direction along the feed pipe support arm 20, supported by the feed pipe support arm 20, and the feed pipe support arm 20. Extends to the tip side of the.

  As described above, the discharge portion 21 is provided at the tip of the concrete feed pipe 4. Since the discharge part can be moved up and down by the third turning device 17, the discharge position from the discharge part 21 can be arranged close to the concrete placement position. Thereby, the problem of separation of concrete due to discharging concrete from a high position can be prevented.

  As described above, the boom member 3 according to this embodiment can be turned in the horizontal direction by the first turning device 9 and the second turning device 13.

  Specifically, as shown in FIG. 3, the first turning device 9 is driven and the boom member 3 is moved left and right as indicated by reference numerals 90 and 91, so that the boom member 3 extends linearly. Then, the tip of the discharge pipe 5 moves in an arc shape centering on the first turning device 9 within a range indicated by a two-dot chain line 80.

  On the other hand, by driving the second turning device 13, the tip of the discharge pipe moves in an arc shape centering on the second turning device 13 within a range indicated by a two-dot chain line 81.

  Since the first turning device 9 and the second turning device 13 are driven independently, when the first turning device 9 moves to the left and right as indicated by reference numerals 90 and 91, at the rotation center of the second arm 12. A certain second turning device 13 moves along a locus indicated by a two-dot chain line 82. Further, the tip of the discharge pipe 5 can be moved along the locus shown by the two-dot chain lines 83 and 84 by the second turning device 13 turning independently on the locus. Therefore, the concrete distributor of this embodiment can make the area | region which can arrange | position the discharge piping 5 into a wide range.

  In addition, the concrete distributor of the present embodiment is configured such that the boom member 3 is swiveled only in the horizontal direction. Therefore, as shown in FIG. 4, the discharge pipe 5 is disposed in the vicinity of the swivel base 2. However, the boom member 5 is not lifted to a high position, and it is possible to reduce the labor of placing concrete in a low head area such as a tunnel.

  When the first swing device 9 and the second swing device 13 cause the first arm 11 and the second arm 12 to swing left and right, a lateral moment is applied to the swivel base 2 and the first arm 11. About the moment of a direction, since balance is taken by the counterweights 15 and 16 provided in the 1st arm 11 and the 2nd arm 12, the influence of the said moment can be made small. Therefore, the stability of installation of the concrete distributor 1 can be ensured also by the boom member 5 that pivots in the horizontal direction.

(Second Embodiment)
FIG. 5 is a plan view showing an overall configuration of a concrete distributor according to the second embodiment of the present invention. FIG. 6 is a side view of the concrete distributor of FIG.

  As shown in FIG. 6, the concrete distributor 31 according to the present embodiment is attached and used so as to be movable in the longitudinal direction of the work pier 110 in a low-altitude work area such as a tunnel. The tunnel 100 as an example of the work area is the same as the tunnel shown in FIG. 3, but in the concrete filling work, the pier 110 is installed and the concrete is placed within the range where the pier 110 is provided. .

  As shown in FIG. 7, the working pier 110 is a pier having a length of several tens of meters, which is provided with pedestals 111 at both ends and a cover plate 112 at an intermediate position. The boarding platform 11 is configured with an inclined surface with respect to the installation surface, and is used for introducing a construction vehicle or the like onto the lining plate 112 disposed above the grounding surface. The lining plate 112 includes a mesh or metal plate 113, and handrails 114 are provided on the left and right sides of the plate.

  As shown in FIGS. 1 and 2, the concrete distributor 31 according to the present embodiment includes a swivel base 32, a boom member 33, a concrete feed pipe 34, and a discharge pipe 35.

  The swivel base 32 is a member that is mounted and fixed on the outer portion of the handrail 114 of the lining plate 112 of the work pier 110 and supports the boom member 33. The swivel base 32 includes a clamp portion 36 that fixes the handrail 114 to the handrail 114 by sandwiching the handrail 114 from above and below, and a swivel portion 37 that is positioned below the clamp portion 36 and supports the boom member 33.

  The clamp part 36 is provided with a driving means (not shown) and can move in the longitudinal direction of the handrail 114 along the handrail 114. The turning unit 37 is provided with a first turning device 39 that supports the boom member 33.

  The first turning device 39 can turn around a first turning shaft 40 extending in the vertical direction, and the concrete feed pipe 34 communicates with the inside. The concrete feed pipe 34 communicates with the inside of the first turning device 39 so as to penetrate in the vertical direction so as to coincide with the center of rotation of the first turning shaft 40, and the first turning by the first joint member 42 as will be described later. The angle can be freely adjusted according to the rotation of the shaft 40.

  The first turning device 39 is disposed so as to be located below the cover plate 112 of the work pier 110. Thereby, the boom member 33 described later can be turned to the lower side of the work pier 110.

  The boom member 33 includes a first arm 41 fixed to the first turning device 39 and a second arm 42 that is rotatably provided at the tip of the first arm 41. The second arm 42 is arranged on the lower side of the first arm by a second turning device 43 provided at the tip of the first arm, and can be rotated with respect to the first arm 41 by the second turning device 43. It has become.

  The second turning device 43 is provided with the second turning shaft 44 extending in the vertical direction, and the concrete feed pipe 34 communicates with the inside. The concrete feed pipe 34 communicates with the inside of the second turning device 39 so as to penetrate in the vertical direction so as to coincide with the center of rotation of the second turning shaft 44, and the second turning by the second joint member 53 as will be described later. The angle can be freely adjusted according to the rotation of the shaft 44.

  Since the first arm 41 and the second arm 42 are rotatably connected by the second turning device 43 extending in the vertical direction, the first arm 41 and the second arm 42 are arranged in parallel to each other and are rotatable in a horizontal plane.

  The second turning device 43 includes a motor 43a for rotating the second turning shaft 44, and the direction of the second arm 42 can be changed to an arbitrary angle.

  A counterweight 46 is provided on the second arm 42. The counterweight 46 of the second arm 42 is provided on the opposite side of the tip of the second arm with respect to the second turning device 43, and the second arm 42 rotates in the left-right direction as shown in FIG. The lateral moment applied to the first arm 41 is reduced.

  A distal end of the second arm 42 is provided with a third turning device 47 for moving the discharge pipe 35 up and down around a nozzle rotation shaft 48 extending in the horizontal direction. The third turning device 47 is provided with a nozzle rotating shaft 48 extending in the horizontal direction, and the concrete feed pipe 34 communicates with the inside. The concrete feed pipe 34 communicates with the inside of the third turning device 47 so as to penetrate in the horizontal direction so as to coincide with the rotation center of the nozzle rotation shaft 48, and the nozzle rotation shaft 48 is connected by the third joint member 54 as will be described later. The angle can be freely adjusted according to the rotation of the lens.

  The third turning device 47 includes a drive device 49 for rotating the nozzle rotation shaft 48. In the present embodiment, the drive device 49 includes an extendable cylinder 49a. By operating the drive lever 49b provided on the discharge pipe 35 by expanding and contracting the cylinder 49a, the discharge pipe 35 is connected to the nozzle rotation shaft 48. Rotate around and up and down.

  The discharge pipe 35 includes a feed pipe support arm 50 connected to the third turning device 47 and a discharge portion 51 supported by the feed pipe support arm 50. The feed pipe support arm 50 is rotationally driven in the vertical direction as indicated by an arrow 95 by the rotational drive of the third turning device 47. The discharge part 21 is provided in the front-end | tip of the concrete supply piping 4, and discharges the concrete supplied from the front-end | tip.

  The concrete feed pipe 34 feeds the concrete sent from the concrete feed pump 88 shown in FIG. 8 to the nozzle portion 51 of the discharge pipe 35. The concrete feed pipe 34 extends from the concrete feed pump along the handrail 114 to the swivel 32 and passes through the first swivel device 39 vertically downward from above the swivel 32. Within the first turning device 39, the first joint member 52 can rotate around the first turning shaft 40. Below the first turning device 39, it is bent in the horizontal direction along the first arm 41, supported by the first arm 41, and extended to the tip side of the first arm 41.

  To the second turning device 43 provided at the tip of the first arm 41, the concrete feed pipe 34 bends downward and passes through the second turning device 43 downward in the vertical direction. In the second turning device 43, the second joint member 53 can rotate around the second turning shaft 44. Below the second turning device 43, it is bent in the horizontal direction along the second arm 42, and extends along the second arm 42 toward the distal end side of the second arm 42.

  As shown in FIG. 5, the concrete feed pipe 34 extends to the side of the second arm along the second arm 42, and is bent in the horizontal direction so as to be orthogonal to the extending direction of the second arm 42 at the tip side. Then, it passes through the third turning device 47 in the horizontal direction. In the third turning device 47, the third joint member 54 can rotate around the nozzle rotation shaft 48. At the side of the third swivel device 47, the feed pipe support arm 50 is bent along the feed pipe support arm 50 in the extending direction, supported by the feed pipe support arm 50, and the feed pipe support arm 50. Extends to the tip side of the.

  As described above, the discharge unit 51 is provided at the tip of the concrete feed pipe 34. Since the discharge part can be moved up and down by the third turning device 47 as indicated by an arrow 95, the discharge position from the discharge part 51 can be arranged close to the concrete placement position. Thereby, the problem of separation of concrete due to discharging concrete from a high position can be prevented.

  As described above, the boom member 3 according to the present embodiment can be turned in the horizontal direction by the first turning device 39 and the second turning device 43, respectively. Further, as shown by arrows 93 and 94 in FIG. 8, the swivel base 32 is movable along the handrail 114 in the extending direction of the handrail 114.

  In the concrete distributor according to the present embodiment, the first turning device 39 is driven and the boom member 33 is moved to the left and right as indicated by reference numeral 92, so that the boom pipe 33 extends in a straight line. The tip of 35 moves in an arc shape centered on the first turning device 39 within a range indicated by a two-dot chain line 85. As described above, since the first turning device 39 is provided below the cover plate 112 of the work pier 110, the boom member 33 is also provided below the pier 110. It is possible to turn.

  Similarly to the concrete distributor according to the first embodiment, by driving the second turning device 43, the tip of the discharge pipe moves in an arc shape centering on the second turning device 13.

  Since each of the first turning device 9 and the second turning device 13 is driven independently, by adjusting the turning angles of the first turning device 39 and the second turning device 43, an arbitrary position inside the two-dot chain line 85 can be obtained. The tip of the discharge pipe 35 can be arranged in this area. Therefore, the concrete distributor of this embodiment can make the area | region which can arrange | position the discharge piping 35 into a wide range.

  Further, since the swivel base 32 is movable in the extending direction of the handrail 114 along the handrail 114 as described above, the swivel base is moved to the region of the two-dot chain line 86 shown in FIG. Discharge piping can be arranged.

  In addition, with the change in the distance between the swivel base 32 and the concrete feed pump 88 due to the left-right movement of the swivel base 32, the concrete feed pipe 34 bends in the vertical direction to change the distance of its horizontal component. Can be made. Specifically, as shown in FIG. 8, joint members 55 a and 55 b are provided at the proximal end of the handrail and the swivel base 32, and a joint member 56 is provided at an intermediate portion of the concrete feed pipe 34. These joint members 55a, 55b, and 56 are all configured to be rotatable around a horizontal rotation axis, and bend or extend according to the position of the swivel base 32 to change the distance of the horizontal component. Can do.

  Moreover, since the concrete distributor of this embodiment is comprised so that the boom member 33 may turn only in a horizontal direction, even in the position of the arrangement position deviation of the discharge piping 35 similarly to 1st Embodiment, the boom The member 35 is not lifted to a high position, and it is possible to reduce the labor of placing concrete in a low head region such as a tunnel.

  When the second arm 42 swings left and right by the second turning device 43, a lateral moment is applied to the turntable 32 and the first arm 41. The lateral moment is applied to the second arm 42. Since the counterweight 46 provided is balanced, the influence of the moment can be reduced.

(Third embodiment)
FIG. 9 is a side view showing the overall configuration of the concrete distributor according to the third embodiment of the present invention. As shown in FIG. 9, the concrete distributor 1a according to the present embodiment has a common structure except for the configuration of the concrete distributor 1 and the boom member 3 according to the first embodiment.

  The boom member 3 a includes a first arm 11 fixed to the first turning device 9 and two second arms 12-1 and 12-2 positioned at the tip of the first arm 11. In the present embodiment, the length of the first arm 11 is reduced by shortening the length of the first arm 11, reducing the influence of the moment in the lateral twist direction by the second arm, and making the second arm a folding structure. It is configured to reduce the influence of.

  The second arms 12-1 and 12-2 are a second turning device 13-1 provided at the tip of the first arm and a second turning device provided between the two second arms 12-1 and 12-2. 13-2 is arranged below the first arm, and is provided by the second turning device 13-2 provided between the second turning device 13-1 and the two second arms 12-1 and 12-2. The first arm 11 is rotatable.

  The second swiveling devices 13-1 and 13-2 are rotatable about the second swiveling shafts 14-1 and 14-2 extending in the vertical direction, and the concrete feed pipe 4 communicates with the second swiveling devices 13-1 and 13-2. The concrete feed pipe 4 communicates with the inside of the second turning device 9 so as to penetrate in the vertical direction so as to coincide with the rotation center of the second turning shafts 14-1 and 14-2. The angle can be freely adjusted by the members 23-1 and 23-2 according to the rotation of the second turning shafts 14-1 and 14-2.

  According to the concrete distributor 1a according to the present embodiment, the first arm can be configured to be short by forming the second arm in a folded structure, and the lateral direction applied to the first arm when the second arm rotates. The effect of the torsional moment can be reduced.

  As described above, according to the concrete distributor according to the present embodiment, since the boom member is configured to turn only in the horizontal direction, the boom can be arranged even when the discharge pipe is arranged at an arbitrary position. The member is not lifted to a high position, and it is possible to reduce the labor of placing concrete in a low head area such as a tunnel. Further, even when the boom member is turned in the lateral direction by the counterweight provided in the boom member, the moment in the lateral direction can be offset and reduced.

  In addition, this invention is not limited to the said embodiment, It can implement in another various aspect.

DESCRIPTION OF SYMBOLS 1,1a, 31 Concrete distributor 2,32 Swivel base 3,33 Boom member 4,34 Concrete feed piping 5,35 Discharge piping 6 Base body 7 Wheel 8 Outrigger 9,39 1st turning device 9a Motor 10,40 1st Rotating shafts 11, 41 First arms 12, 12-1, 12-2, 42 Second arms 13, 13-1, 13-2, 43 Second turning devices 13a, 13a-1, 13a-2 Motors 14, 14 -1,14-244 Second swivel shaft 15, 16, 16-1, 16-2, 46 Counterweight 17, 47 Third swivel device 18, 48 Nozzle rotation shaft 19, 49 Drive device 19a, 49a Cylinder 19b, 49b Drive lever 20, 50 Feed pipe support arm 21, 51 Discharge part 22, 52 First joint member 23, 23-1, 23-2, 53 Second joint member 4, 54 Third joint member 36 Clamp part 37 Swivel part 55a, 55b, 56 Joint member 100 Tunnel 101 Road center 102 Invert concrete 103a, 103b Sprayed concrete 104 Covering concrete 105a, 105b Drain pipe 110 Work pier 111 Riding stand 112 lining plate 113 laying plate 114 handrail

Claims (7)

A swivel having a first swivel device that is rotatable around a first swivel axis extending in a vertical direction;
One end is supported by the first swivel device, and has a plurality of arms arranged to be rotatable with respect to each other in a horizontal plane by a second swivel device that is rotatable around a second swivel axis, and extends in the vertical direction. A boom member in which the plurality of arms are connected in parallel to each other by a second pivot axis;
A concrete feed pipe having a joint member having a rotation center coinciding with the rotation center of the first swivel shaft and the second swivel shaft, and supported by the boom member;
A discharge pipe that communicates with the tip of the concrete feed pipe and is configured to be movable in the vertical direction within a vertical plane around a nozzle rotation axis extending in the horizontal direction;
A concrete distributor characterized by comprising: The arm of the boom member is
A first arm supported in a substantially horizontal direction on the swivel;
2. The concrete distributor according to claim 1, comprising: a second arm provided around a second pivot axis so as to be rotatable in a horizontal plane with respect to the first arm.   The concrete distributor according to claim 2, wherein the second arm includes a counterweight on an end portion facing the discharge pipe with respect to the second turning shaft.   The said discharge piping is provided in the other end of the said boom member, and is connected to the said concrete feed piping via the nozzle joint member in which the said nozzle rotating shaft and a rotation center correspond, The 1-3 characterized by the above-mentioned. A concrete distributor according to any one of the above.   The boom member includes the first arm and at least two second arms, and each of the second arms is connected to be arranged in a length direction by the second turning device. The concrete distributor according to claim 2.   The concrete distributor according to claim 1, wherein the swivel base is mounted on a self-propelled vehicle.   The concrete distributor according to any one of claims 1 to 5, wherein the swivel is provided on the pier so as to be movable along a longitudinal direction of the pier.

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