Concrete supply distributor

Abstract

To allow mutual connection work of masts to be performed quickly and correctly and to contribute to enhancing work efficiency in the connection work, in a distributer for concrete supply which includes a base device, a mast device having a single mast supported in a standing state on the base device or a plurality of masts connected with each other in a standing state or in a longitudinal column state with each other, and a boom device loaded on the mast which is at the uppermost position.SOLUTION: On an end part outer periphery of a mast M, and on an end part outer periphery of a base device or a boom device facing thereto, a plurality of connecting blocks 21, 21' is fixed having uneven contact surfaces 22, 22'contacting with each other and arranged side by side in the circumferential direction with an interval from each other. The connecting blocks are arranged in such a manner that the contact surfaces 22, 22' further protrude respectively than the mast M on which they are fixed or the end surface of the base device or the boom device, and a clearance 29 exists between the opposing masts M and end surfaces of the base device or the boom device.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a concrete supply distributor including a base device, a mast device having a plurality of masts that are supported in a standing state on the base device and coupled to each other in a vertical row, and a boom device mounted on the uppermost mast.

Background Art

[0002] The above concrete supply distributor is conventionally known as disclosed in, for example, Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the distributor as shown in Patent Document 1, coupling flanges are respectively provided protruding from the outer peripheries of adjacent ends of a pair of adjacent masts, and the coupling flanges are overlapped with each other and bolted to integrally couple a pair of adjacent masts.

[0005] However, since the contact surfaces of the above coupling flanges are flat surfaces, not only is it difficult to align the two flanges when overlapping their contact surfaces, but also the contact surfaces are likely to slide against each other and cause misalignment after alignment. Therefore, it is not easy to quickly and accurately perform the coupling operation including the alignment operation between the masts, and there is a problem of poor work efficiency.

[0006] The present invention has been proposed in view of the above, and an object thereof is to provide a concrete supply distributor capable of solving the problems of the conventional structure with a simple structure. [Means for solving the problem]

[0007] To achieve the above objective, the present invention provides a concrete supply distributor comprising a base device, a mast device having a single mast supported upright on the base device or a plurality of masts supported upright and connected to each other in a longitudinal arrangement, and a boom device mounted on the uppermost mast, wherein a plurality of connecting blocks are fixed to the outer circumference of the end of the mast facing the end of the boom device, and to the outer circumference of the end of the boom device facing the end of the mast, respectively, with spacing between them in the circumferential direction, and these connecting blocks are in contact with each other, and protrusions and recesses provided on one and the other contact surfaces are engaged with each other in such a way that they can position the mast and the boom device facing it and suppress misalignment between the mast and the boom device in the direction along the contact surface, and the first feature is that the contact surfaces of the connecting blocks are arranged so that they protrude beyond the end faces of the mast and the boom device to which they are fixed, and a clearance exists between the end faces of the opposing mast and boom device.

[0008] Furthermore, the present invention provides a concrete supply distributor comprising a base device, a mast device having a single mast supported upright on the base device, or a plurality of masts supported upright and connected to each other in a longitudinal arrangement, and a boom device mounted on the uppermost mast, wherein a plurality of connecting blocks are fixed to the outer circumference of the end of the mast facing the end of the base device, and to the outer circumference of the end of the base device facing the end of the mast, respectively, with spacing between them in the circumferential direction, and these connecting blocks are in contact with each other, and convex and concave portions provided on one and the other contact surfaces are engaged with each other in such a way that the mast and the base device facing it are positioned relative to each other and misalignment between the mast and the base device in the direction along the contact surface, and the connecting blocks are arranged such that their contact surfaces protrude beyond the end faces of the mast and the base device to which they are fixed, thereby creating a clearance between the opposing end faces of the mast and the base device.

[0009] Furthermore, in addition to the first feature, the present invention has a third feature in which a plurality of coupling blocks are fixed to the outer circumference of the end of the mast facing the end of the base device, and to the outer circumference of the end of the base device facing the end of the mast, with spacing between them in the circumferential direction, and these coupling blocks are in contact with each other, and the convex and concave portions provided on one and the other contact surfaces are engaged with each other in such a way that the mast and the base device facing it are positioned relative to each other and misalignment between the mast and the base device in the direction along the contact surface, and the coupling blocks are arranged such that the contact surfaces protrude beyond the end faces of the mast and the base device to which they are fixed, thereby creating a clearance between the opposing end faces of the mast and the base device. [Effects of the Invention]

[0010] According to the present invention, in a concrete supply distributor comprising a base device, a mast device having a single mast supported upright on the base device, or a plurality of masts supported upright and connected to each other in a longitudinal arrangement, and a boom device mounted on the uppermost mast, a plurality of connecting blocks are fixed to the outer circumference of each end of each mast and to the outer circumference of the end of the boom device or base device facing it, spaced apart in the circumferential direction, and the connecting blocks fixed to the outer circumference of adjacent ends come into contact with each other, and the convex and concave portions provided on one and the other contact surfaces respectively engage with each other in such a way that the mast and the boom device or base device facing it are positioned relative to each other and misalignment of the mast and boom device or base device in the direction along the contact surface is suppressed. Therefore, when bringing the connecting blocks into contact with each other, the convex and concave portions provided on one and the other contact surfaces respectively engage with each other, and misalignment in the direction along the contact surface is reliably prevented by the aforementioned engagement. This allows for quick and accurate joining operations, greatly contributing to increased work efficiency.

[0011] Furthermore, the connecting blocks are positioned so that their contact surfaces protrude from the end faces of the mast and boom or base device to which they are fixed around the outer circumference of the end, and a clearance exists between the opposing end faces of adjacent masts. This allows the connecting blocks to come into contact with each other accurately, regardless of the machining errors of each end face, thereby enabling accurate joining of the masts and other components while reducing machining costs. [Brief explanation of the drawing]

[0012] [Figure 1] (A) is an overall longitudinal cross-sectional view showing an example of the operating state of a distributor according to one embodiment of the present invention, and (B) is a view taken along arrow 1B in Figure 1(A). [Figure 2] Overall side view of the base device (enlarged view of the area indicated by arrow 2 in Figure 1(A)) [Figure 3] Overall plan view of the base unit (view from arrow 3 in Figure 2) [Figure 4] Partial broken-out and enlarged plan view of the 4-arrow view portion of FIG. 3 [Figure 5] (A) is a sectional view taken along line 5A-5A of FIG. 4, and (B) is a sectional view taken along line 5B-5B of FIG. 4 [Figure 6] (a) is an exploded plan view of the main part of the base body and the outrigger as viewed from the same side as FIG. 4, (b) is a sectional view taken along line b-b of FIG. 6(a), and (c) is a sectional view taken along line c-c of FIG. 6(a) [Figure 7] Overall perspective view of the base device [Figure 8] Schematic plan view showing the relationship between the upper and lower coupling pins and the upper and lower pin insertion holes in the operating state when the outrigger is stored and deployed [Figure 9] Side view of the main part of the mast device [Figure 10] (A) is a sectional view taken along line 10A-10A of FIG. 9, (B) is a sectional view taken along line 10B-10B of FIG. 9, and (C) is a sectional view taken along line 10C-10C of FIG. 9 [Figure 11] Overall side view of the boom device with the boom row in a horizontal posture (enlarged side view of the 11-arrow view portion of FIG. 1) [Figure 12] (A) is a sectional view taken along line 12A-12A of FIG. 11, and (B) is a sectional view taken along line 12B-12B of FIG. 12(A) [Figure 13] Overall perspective view of the boom support [Figure 14] Schematic process diagram of the [assembly process] of the distributor [Figure 15] (A) is an enlarged side view of the 15A-arrow view portion of FIG. 14, and (B) is a 15B-arrow view of FIG. 15(A) [Figure 16] Schematic process diagram of the [replacement process] of the distributor [Figure 17] (A) is an enlarged side view of the 17A-arrow view portion of FIG. 16(F), and (B) is a 17B-arrow view of FIG. 17(A) [Figure 18] (A) is an enlarged side view of the 18A-arrow view portion of FIG. 17(B), and (B) is an enlarged side view of the 18B-arrow view portion of FIG. 17(A) [Figure 19] Schematic process diagram showing variations in the latter half of the [replacement process] of the distributor [Figure 20]A schematic diagram generally showing the mutual coupling relationship between the upper and lower frames and the upper and lower bearings, where (A) is a schematic plan view of an embodiment, (B) is a schematic side view of the embodiment (viewed in the direction of arrow 20B in FIG. 20(A)), (C) is a schematic plan view of another embodiment, and (D) is a schematic side view of another embodiment (viewed in the direction of arrow 20D in FIG. 20(C)). [Figure 21] A circuit diagram showing the outline of the grease supply system of the embodiment

Embodiments for Carrying out the Invention

[0013] Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

[0014] The concrete distributor D for supply is used to receive fresh concrete for constructing various parts of the structure (such as floor slabs and each wall body, etc.) at a construction site such as a building from a concrete pump (not shown) placed on the ground at the site and supply it to various places at the placing site at a high place. An example of its use is shown in FIG. 1.

[0015] This distributor D includes a base device 10 serving as a base, a height-adjustable mast device 20 supported in a standing state on the base device 10, and a boom device 30 mounted on the mast device 20. Next, an example of each of the devices 10, 20, 30 will be described in order with reference to FIGS. 2 to 13.

[0016] First, the base device 10 will be described with reference to FIGS. 2 to 7. It has a base body 10m and an outrigger 16 whose base 16b is rotatably supported on the base body 10m via a rotation support shaft 17. The outrigger 16 is operable to rotate between a storage position 16B that fits inside the base body 10m and a predetermined deployed position 16A that projects outward from the storage position 16B (i.e., outside the base body 10m). The base body 10m is composed of a rigid frame formed by framing a plurality of metal frames.

[0017] Specifically, the base body 10m is equipped with a base frame 11 that serves as the central skeletal structure. This base frame 11 integrally comprises a rectangular tubular section 11b formed in a rectangular cross-section and extending vertically, and four vertical wall sections 11a extending radially from the front, rear, left, and right tops of the rectangular tubular section 11b. As is clear from Figures 2 to 7, each vertical wall section 11a has a complex three-dimensional shape and is therefore constructed by integrally joining multiple wall elements together (e.g., welding, bolting, etc.). Furthermore, a bracket 11ab with a locking hole is fixed (e.g., by welding, etc.) to the upper part of each vertical wall section 11a for locking the lower end of a suspension wire when the base device 10 is suspended by a crane alone (see, for example, Figure 14(A)).

[0018] Furthermore, the rectangular tube portion 11b in this embodiment has substantially the same cross-sectional shape as the mast M of the mast device 20, which will be described later, and a plurality of connecting blocks 21 are fixed at intervals around the outer circumference of the upper end of this rectangular tube portion 11b. Using these connecting blocks 21 and a plurality of connecting blocks 21' fixed around the outer circumference of the lower end of the lowest mast M, the lowest mast M and the rectangular tube portion 11b (and therefore the base body 10m) are connected to each other, as will be described later.

[0019] The base body 10m also comprises the base frame 11 described above, a plurality of upper frames 12 (four in the illustrated example) fixed to the base frame 11 and arranged to surround the base frame 11, upper bearings 14 connecting adjacent ends of adjacent upper frames 12, a plurality of lower frames 13 fixed to the base frame 11 and arranged at intervals directly below the upper frames 12 corresponding to each of the plurality of upper frames 12, and lower bearings 15 connecting adjacent ends of adjacent lower frames 13. The upper bearings 14 and lower bearings 15 each comprise cylindrical bearing bodies 14b, 15b and enclosure frames 14k, 15k fixed (e.g., welded) to the bearing bodies 14b, 15b and surrounding their outer circumference. A plurality of ground-contactable support legs 13a are provided protruding from the lower surface of the lower frame 13.

[0020] Thus, the upper bearing 14 is connected to the adjacent ends of adjacent upper frames 12 so as to connect them, so that at least a part of the upper bearing 14 is located on the side of the intersection O of the extension lines of the outer surfaces along the longitudinal direction of adjacent upper frames 12 in a plan view (i.e., on the side of the rectangular tube portion 11b, in other words, on the side of the center of the base body 10m). On the other hand, the lower bearing 15 is connected to the adjacent ends of adjacent lower frames 13 so as to connect them, so that at least a part of the lower bearing 15 is located on the side of the intersection O of the extension lines of the outer surfaces along the longitudinal direction of adjacent lower frames 13 in a plan view (i.e., on the side of the rectangular tube portion 11b, in other words, on the side of the center of the base body 10m).

[0021] As a result, the outrigger base 16b, positioned between the upper bearing 14 and the lower bearing 15, is positioned in the space between the upper bearing 14, which is connected to the adjacent end of the adjacent upper frame 12 closer to the inside of the base frame 11 (i.e., closer to the rectangular tube portion 11b, in other words, closer to the center of the base body 10m), and the lower bearing 15, which is connected to the adjacent end of the adjacent lower frame 13 closer to the inside of the base frame 11 (i.e., closer to the rectangular tube portion 11b, in other words, closer to the center of the base body 10m). Therefore, the outrigger 16 can be effectively suppressed from extending outwards from the base body 10m (i.e., the frame frame including the base frame 11 and the upper and lower frames 12 and 13) when stored, allowing for a smaller base device 10 and reducing the space it occupies. As a result, the base device 10 can be easily moved and passed through narrow spaces at construction sites (for example, through holes that penetrate floor slabs vertically), improving work efficiency.

[0022] Furthermore, the enclosure frames 14k and 15k described above have plate-shaped enclosure frame bodies 140 and 150 that surround the bearing bodies 14b and 15b with an annular gap in between, and a pair of upper and lower first and second support plate portions 141, 142; 151, 152 that sandwich the enclosure frame bodies 140 and 150 from above and below and are fixed (for example, butt-welded) to the upper and lower ends of the enclosure frame bodies 140 and 150, respectively. The pair of upper and lower first and second support plate portions 141, 142; 151, 152 are then fixed (for example, welded) to the upper bearing 14 or the lower bearing 15 that passes through them.

[0023] In particular, the enclosure frame bodies 140 and 150 of the embodiment have flat mounting surfaces 14kf and 15kf on the faces opposite to the upper frame 12 or lower frame 13, respectively, which are perpendicular to the longitudinal centerlines of the upper and lower frames 12 and 13. The end faces 12e and 13e of the upper frame 12 or lower frame 13 are fixed (butt welded in the embodiment) to these mounting surfaces 14kf and 15kf. As a result, even if the bearing bodies 14b and 15b are cylindrical, the enclosure frames 14k and 15k are interposed between their outer circumferential surfaces and the end faces 12e and 13e of the upper and lower frames, allowing the load to be transmitted almost evenly between the bearing bodies 14b and 15b and the upper and lower frames 12 and 13 without bias. This reduces the load burden on each part, thereby increasing durability.

[0024] In this embodiment, one of the pair of first and second support plate portions 141 and 142 (142) on the upper side and one of the pair of first and second support plate portions 151 and 152 (151) on the lower side are formed integrally with a part of the corresponding vertical wall portion 11a of the base frame 11. However, they may also be formed separately and later attached to the front of the vertical wall portion 11a (for example, by welding, bolting, etc.).

[0025] Furthermore, on the outer edge of each vertical wall portion 11a in the base frame 11, a concave curved portion 18 is formed that is arc-shaped and recessed inward (i.e., toward the rectangular tube portion 11b) between the corresponding upper bearing 14 and lower bearing 15.

[0026] As is clear from Figure 4, the contact surfaces between the mounting surfaces 14kf and 15kf of the enclosure frame bodies 140 and 150 and the corresponding upper frame 12 or lower frame 13 are positioned outside a virtual vertical plane X that passes through the central axis of the upper bearing 14 or lower bearing 15 surrounded by the enclosure frames 14k and 15k having the mounting surfaces 14kf and 15kf, and is parallel to the longitudinal centerline of the corresponding upper frame 12 or lower frame 13. This allows for a wider support span for the upper and lower bearings 14 and 15 by the upper and lower frames 12 and 13, thereby increasing the support rigidity for the upper and lower bearings 14 and 15.

[0027] Furthermore, each outrigger 16 is set to have a maximum vertical width L1 (see Figure 6(c)) smaller than the distance between the opposing surfaces of the upper and lower frames 12 and 13, so that it can enter the space between the corresponding upper and lower frames 12 and 13 when retracted, and a longitudinal length L2 (see Figure 6(a)) such that the tip 16a of the outrigger 16 does not interfere with the base 16b of the adjacent outrigger 16 when retracted. This makes it possible to fully utilize the space between the upper and lower frames 12 and 13 as a storage space for the outrigger 16 when retracted, while avoiding mutual interference between the base 16b of each outrigger 16, including the bearing cylinder portion 16ba, and the tip 16a of the adjacent outrigger 16, and therefore makes it possible to more effectively suppress the outward extension of the outrigger 16 out of the base body 10m when retracted.

[0028] Each outrigger 16 has a main outrigger body 16m, which is made of a metal frame with a sturdy, hollow, closed cross-section structure having a flattened rectangular cross-section, and is formed in a horizontally elongated rectangular shape when viewed from the side. Each outrigger 16 has a bearing cylinder portion 16ba that extends vertically integrally to its base portion 16b, and each bearing cylinder portion 16ba is positioned between the corresponding upper bearing 14 and lower bearing 15. When each outrigger 16 is set on the base body 10m, the pivot shaft 17 is fitted so as to be able to rotate relative to the upper bearing 14, bearing cylinder portion 16ba and lower bearing 15 which are aligned on the same vertical axis. As a result, the outrigger 16 can rotate around the pivot shaft 17 between a retracted position 16B along the upper frame 12 and lower frame 13 and an extended position 16A that extends outward from the retracted position 16B.

[0029] Furthermore, a retaining mechanism 19 is interposed between the pivot shaft 17 and the upper bearing 14 (or lower bearing 15) in a manner that prevents the pivot shaft 17 from coming out, and is detachably attached to the upper bearing 14 (or lower bearing 15).

[0030] As is clear from Figure 3, in this embodiment, the deployment position 16A of the outrigger 16 can be selectively set to a main deployment position 16A0 that extends in the direction of extension of the vertical wall portion 11a in a plan view, and first and second sub-deployment positions 16A1 and 16A2 that extend in the respective directions of extension of the upper and lower frames 12 and 13 on one and the other sides, sandwiching the upper and lower bearings 14 and 15.

[0031] In this embodiment, pin insertion holes 16h0, 16h1~16h3; 10h0, 10h1, 10h2 are provided in each of the outriggers 16 and the base body 10m, allowing insertion and removal of coupling pins P1, P2 that can fix the outriggers 16 to the base body 10m when the outriggers 16 are at least in the deployed position 16A (and also when they are in the retracted position 16B in this embodiment). The inner diameters of these pin insertion holes 16h0, 16h1~16h3; 10h0, 10h1, 10h2 are set to the same diameter, and the outer diameters of the upper and lower coupling pins P1, P2 are set to the same diameter, but slightly smaller than the inner diameter.

[0032] In this embodiment, the upper coupling pin P1 is connected to the upper part of each upper bearing 14 via a wire to improve workability and prevent loss, and the lower coupling pin P2 is connected to the outer surface of the base 16b of each outrigger 16 via a wire to improve workability and prevent loss. Alternatively, the coupling pins P1 and P2 may not be attached to the base body 10m in this manner, but rather stored by workers in a suitable location on site and taken out and used as needed.

[0033] Next, the structure of each pin insertion hole will be specifically explained with reference to Figures 4 to 6. The upper and lower walls 161 and 162 of the rectangular cross-section outrigger body 16m are formed to be slightly wider than the planar shape of the upper and lower intermediate part of the outrigger body 16m. On the upper and lower extensions 161f and 162f of these upper and lower walls 161 and 162, which protrude outward from the upper and lower intermediate walls of the outrigger body 16m, three pin insertion holes 16h1 to 16h3 for fixing the deployment position are provided at circumferential intervals, particularly on the base 16b side of the outrigger 16. These pin insertion holes 16h1 to 16h3 for fixing the deployment position are distributed in three locations, as is clear from Figure 6(a), corresponding to the three deployment positions 16A of the outrigger 16 (i.e., the main deployment position 16A0 and the first and second sub-deployment positions 16A1 and 16A2). Furthermore, the upper extension portion 161f of the tip portion 16a of the outrigger 16 is provided with a pin insertion hole 16h0 for fixing it in the retracted position.

[0034] Furthermore, instead of providing pin insertion holes 16h0, 16h1 to 16h3 on the outrigger 16 side in the upper and lower extensions 161f and 162f, at least one of them may be provided by drilling a hole in the main part of the outrigger body 16m, for example, in the wall portion that constitutes the closed cross-section of the outrigger body 16m.

[0035] On the other hand, the base body 10m has a first pin insertion hole 10h0 on the base body 10m side for fixing the outrigger 16 in the stowed position 16B in cooperation with the pin insertion hole 16h0 on the tip 16a side of the outrigger 16 and the upper coupling pin P1, and this first pin insertion hole 10h0 is provided on the bracket 12b fixed to the middle part of the upper frame 12.

[0036] Furthermore, the upper and lower support plates 141, 142; 151, 152 of the enclosure frames 14k, 15k that clamp the base body 10m, particularly the upper and lower bearings 14, 15 from above and below, respectively, have multiple (two in the illustrated example) second pin insertion holes 10h1, 10h2 on the base body 10m side for fixing the outrigger 16 to the three deployment positions 16A0, 16A1, and 16A2, respectively, in cooperation with the upper and lower pin insertion holes 16h1 to 16h3 on the base portion 16b side of the outrigger 16.

[0037] Thus, as is clear from Figure 5(A), some of the multiple second pin insertion holes 10h1, 10h2 (especially the pin insertion holes 10h1 provided in the upper and lower support plate portions 151, 152 of the enclosure frame 15k of the lower bearing 15) are inserted into the lower coupling pin P2 along with one of the pin insertion holes 16h1 to 16h3 on the base portion 16b side of the outrigger 16 (in the illustrated example, the lower pin insertion hole 16h2), thereby enabling the outrigger 16 to be fixed in the stowed position 16B.

[0038] Figure 8 is a diagram that clearly illustrates how the insertion relationship between the upper and lower coupling pins P1 and P2, which are used to fix the outrigger 16 in each operating position (i.e., the retracted position 16B, and the three deployed positions 16A0, 16A1, and 16A2), and the pin insertion holes 16h0, 16h1 to 16h3; 10h0, 10h1, and 10h2 changes in this embodiment.

[0039] In Figure 8, the thick black dots indicate coupling pins P1 and P2 selected to fix the outrigger 16 in the operating position (16B, 16A0, 16A1, 16A2), and the reference numerals in parentheses indicate the pin insertion holes into which the selected coupling pins P1 and P2 are inserted.

[0040] In this embodiment, when the outrigger 16 is in the retracted position 16B or the deployed position 16A, the coupling pins P1 and P2 can be inserted into the respective pin insertion holes 16h1 to 16h3, 10h1, and 10h2 of the outrigger 16 and the base body 10m, respectively. This makes it possible to securely fix the outrigger 16 to the base body 10m in the retracted position 16B or the deployed position 16A, thereby stabilizing the support of the base device 10 and, consequently, the support of the distributor D.

[0041] Furthermore, the outrigger 16 of this embodiment has an outrigger body 16m and extensions 161f and 162f fixed to the outrigger body 16m and extending outward from the outer surface of the outrigger body 16m, and pin insertion holes 16h0, 16h1 to 16h3 on the outrigger 16 side are provided in the extensions 161f and 162f. As a result, the pin insertion holes 16h0, 16h1 to 16h3 can be arranged in the outrigger 16 (especially the extensions 161f and 162f) with a high degree of freedom without affecting the cross-sectional shape of the outrigger body 16m, and it is also possible to avoid the occurrence of stress concentration points (and consequently weak points) in the outrigger 16 due to the special arrangement of pin insertion holes 16h0, 16h1 to 16h3, thereby ensuring sufficient strength in the outrigger 16.

[0042] Furthermore, the outrigger 16 of this embodiment has pin insertion holes 16h0, 16h1 to 16h3 on the outrigger 16 side at its tip 16a and base 16b, respectively. On the other hand, the base body 10m has a first pin insertion hole 10h0 on the base body 10m side that works in cooperation with the pin insertion hole 16h0 on the tip 16a side of the outrigger 16 to fix the outrigger 16 in the stowed position 16B, and two second pin insertion holes 10h1 and 10h2 on the base body 10m side that work in cooperation with the three pin insertion holes 16h1 to 16h3 on the base 16b side of the outrigger 16 to fix the outrigger 16 in the deployed position 16A (more specifically, the main deployed position 16A0, and the first and second sub-deployed positions 16A1 and 16A2). Furthermore, a portion of the second pin insertion holes 10h1 and 10h2 (the lower pin insertion hole 10h1) is inserted into the lower coupling pin P2 along with one of the pin insertion holes 16h1 to 16h3 on the base 16b side of the outrigger 16 (the lower pin insertion hole 16h2), thereby enabling the outrigger 16 to be fixed in the stowed position 16B. As a result, a portion 10h1 of the two second pin insertion holes 10h1 and 10h2 on the base body 10m side, one of the three pin insertion holes 16h1 to 16h3 on the outrigger base 16b side, 16h2, and the lower coupling pin P2 can be used not only to fix the outrigger 16 in the deployed position 16A but also in the stowed position 16B, thereby simplifying the fixing structure and contributing to cost reduction.

[0043] In the above embodiment, in order to fix the outrigger 16 in the retracted position 16B, two upper and lower coupling pins P1 and P2 are inserted into two pin insertion holes 10h0 and 10h1 on the base body 10m side at two locations on the tip 16a side and the base 16b side of the outrigger 16. However, it is also possible to use only one coupling pin (for example, the upper coupling pin P1) to fix the outrigger 16 in the retracted position 16B.

[0044] In this case, for example, the upper coupling pin P1, which is inserted into one of the second pin insertion holes 10h1, 10h2, when the outrigger 16 is deployed, can be inserted into the first pin insertion hole 10h0 when the outrigger 16 is retracted to fix the outrigger 16 in the retracted position 16B. This allows the outrigger 16 to be fixed in the retracted position 16B using only a single coupling pin P1, and that same coupling pin P1 can be reused to fix the outrigger 16 in the deployed position 16A, thereby simplifying the fixing structure and, consequently, reducing costs.

[0045] Although not shown in the diagram, the outrigger 16 may be fixed in the retracted position 16B and the deployed position 16A using dedicated coupling pins. In that case, for example, the retracted position 16B and the deployed position 16A can each be fixed with one dedicated pin, but the hole provided in the outrigger 16 for fixing the retracted position 16B is located at the tip of the outrigger 16, and the hole provided in the outrigger 16 for fixing the deployed position 16A is located at the base of the outrigger 16.

[0046] Next, an example of the mast device 20 will be described with reference to Figures 9 and 10.

[0047] The mast device 20 is composed of multiple masts M that are supported upright on the base device 10 and connected to each other in a longitudinal order. By increasing the number of connected masts M, the overall length (and therefore overall height) of the mast device 20 can be increased. The boom device 30 is mounted on the upper part of the mast device 20 (i.e., the upper part of the uppermost mast M).

[0048] These masts M are basically identical in structure, having a robust, closed-section rectangular cross-section. A ladder 23 is fixed to the outer surface of each mast M for workers to ascend and descend along the mast device 20, and a work platform 24 is fixed to the top of the uppermost mast M for workers to safely perform various tasks. These fixing tasks are performed in advance before the mast device 20 is installed on the base device 10, for example, by fixing means not shown (e.g., bolting, pinning, crimping, etc.). The various tasks performed on the work platform 24 include, for example, the work of connecting the mast device 20 and the boom device 30 in the [assembly process] of the distributor D described later, the work of connecting various pipes, and maintenance work such as inspection, maintenance, and lubrication of each part of the boom support base BS.

[0049] Furthermore, connecting pipes 28 are fixed to the outer circumference of each mast M, and are arranged in a longitudinal configuration along the mast M, and are connectable to concrete pumping pipes extending from a concrete pump (not shown). Adjacent connecting pipes 28 can be liquid-tightly connected to each other with appropriate joints. In this embodiment, the length of the connecting pipes 28 is set to half the length of one mast M. For example, for a mast M with a total length of 4 m, two 2 m connecting pipes 28 are connected in series.

[0050] Furthermore, multiple connecting blocks 21, 21' are fixed (e.g., welded) to the outer circumference of the upper and lower ends of each mast M, respectively, with the same circumferential position at both ends and spaced apart from each other in the circumferential direction. Thus, the connecting blocks 21, 21' fixed to the outer circumference of the adjacent ends of a pair of adjacent masts M come into contact with each other when the two masts M are arranged vertically in a vertical column. At least one protrusion 22t is provided on one of the contact surfaces 22, 22' (i.e., the upward contact surface), and at least one recess 22d is provided on the other of the contact surfaces 22, 22' (i.e., the downward contact surface). These protrusions 22t and recesses 22d engage with each other in such a way that they can correctly position the pair of adjacent masts M and suppress misalignment of the pair of masts M in the circumferential and radial directions along the contact surfaces 22, 22'.

[0051] The pair of connecting blocks 21, 21' that abut each other are then integrally joined together by a plurality of bolts 25 that pass through both connecting blocks 21, 21'. This joining maintains the abutment between the connecting blocks 21, 21' and, consequently, the engagement between the convex portion 22t and the concave portion 22d. In this case, the tightening effect of the abutment surfaces by the bolts 25 and the interlocking effect of the concave and concave engaging portions work together (i.e., the cooperation of the connecting blocks 21, 21' and the bolts 25) to reliably prevent misalignment between adjacent pairs of masts M while tightly and firmly joining the two masts M.

[0052] Furthermore, as is clear from Figures 10(A) and (B), the bolt 25 in this embodiment includes a first bolt 25 that penetrates the tip surface of the protrusion 22t and the bottom surface of the recess 22d that abuts against the tip surface, a second bolt 25 that penetrates the contact surfaces 22 and 22' of the two connecting blocks 21 and 21' on one side of the protrusion 22t, and a third bolt 25 that penetrates the contact surfaces 22 and 22' of the two connecting blocks 21 and 21' on the other side of the protrusion 22t. As a result, the tightening effect between the contact surfaces by the first to third bolts is exerted more strongly at the engagement portion between the protrusion and recess and its surrounding area, thereby enhancing the interlocking effect of the protrusion and recess engagement portion, making it possible to firmly connect the two masts while more reliably preventing misalignment between the adjacent pair of masts.

[0053] Furthermore, instead of using the first to third bolts 25 described above, the connection between the two masts M, M can also be achieved by using only the first bolt 25 that penetrates the convex portion 22t and the concave portion 22d. Alternatively, the connection between the two masts M, M can also be achieved by using the second and third bolts 25 that penetrate both sides of the convex portion 22t and the concave portion 22d.

[0054] As is clear from Figures (B) and (C), the connecting blocks 21 and 21' in this embodiment are positioned such that their contact surfaces 22 and 22' protrude from the end face of the mast M to which they are fixed around the outer circumference of the end. This creates a small clearance 29 between the opposing end faces of adjacent masts M. This allows the connecting blocks 21 and 21' to be brought into contact with each other accurately without being affected by machining errors in the end faces of the masts M, thus enabling accurate joining of adjacent masts M while reducing the machining costs of the masts M.

[0055] Alternatively, the above clearance 29 may be omitted, and the opposing end faces of adjacent masts M may be brought into direct contact with each other.

[0056] Thus, the interlocking of the interlocking surfaces of the connecting blocks 21, 21' allows for easy positioning of adjacent pairs of masts M, and the interlocking reliably prevents misalignment of the pair of masts M in the direction along their interlocking surfaces. As a result, the connecting of the masts M can be performed quickly and accurately, significantly improving work efficiency.

[0057] Furthermore, a projection 21t is integrally provided on the back surface 26 of each connecting block 21, 21', that is, the surface facing the outer circumference of the mast M, which fits into a support hole 27 provided at the end of the mast M to which the connecting block 21, 21' contacts. When this projection 21t is fitted into the support hole 27, the installation portion of each connecting block 21, 21' on the end of the mast M can be easily and accurately positioned. Moreover, the fitting portion between the projection 21t and the support hole 27 is welded, and the outer circumference of the above-mentioned opposing surface 26 of the connecting block 21, 21' is welded over a wide area in the circumferential direction to the outer surface of the mast M, thereby increasing the overall welding area, and thereby effectively increasing the overall bonding strength between each connecting block 21, 21' and the mast M.

[0058] Furthermore, the protrusions 21t and support holes 27 that create the interlocking engagement portion on the opposing surfaces of the back surfaces of the connecting blocks 21 and 21' and the outer circumference of the mast M may be omitted. In that case, the opposing surfaces, each of which is a flat surface, are welded together in direct planar contact.

[0059] In this embodiment, the interlocking structure of the contact surfaces of the connecting blocks 21, 21' is illustrated by having stepped interlocking surfaces for the protrusions 22t and recesses 22d provided on one and the other contact surfaces, respectively. However, the interlocking structure is not limited to this embodiment, and for example, the protrusions and recesses may be made of mutually fitting projections and recesses.

[0060] Incidentally, in the description of the structure of the base frame 11 of the base device 10, it was explained that a plurality of connecting blocks 21 are fixed at intervals around the outer circumference of the upper end of the rectangular tube portion 11b, which has substantially the same cross-sectional shape as the mast M. The connecting blocks 21 of this rectangular tube portion 11b have the same structure as the connecting blocks 21 on the upper end side of the mast M, and the block fixing structure to the rectangular tube portion 11b is the same as the fixing structure of the connecting blocks 21, 21' to the mast M. That is, the method of connecting the connecting blocks 21 of the rectangular tube portion 11b and the connecting block 21' fixed to the lower end of the lowest mast M is the same as the method of connecting the connecting blocks 21, 21' between adjacent masts M as described above.

[0061] Next, an example of the boom device 30 will be explained with reference to Figures 11-13 and 15.

[0062] The boom device 30 comprises a boom row BT consisting of a plurality of booms B1 to B4 arranged in series with respect to each other and pivotally connected to each other so as to bend and swing, and a boom support base BS attached to the upper part of the mast device 20 (specifically the upper end of the mast M at the uppermost position) and supporting the first boom B1 at the base end of the boom row BT so as to be able to luff and rotate via a pivot J1.

[0063] The boom support base BS comprises a fixed base 31 fixed to the upper part of the mast device 20, and a slewing base 32 that is rotatably supported on the fixed base 31 via a vertical slewing axis J5, the upper part of which is connected to the slewing axis J5 so as to rotate integrally with the slewing base 32.

[0064] Multiple slewing bearings 31b are fixed within the fixed base 31, which fit and support the slewing shaft J5 so that it is immovable relative to the axial direction but rotatable relative to the axial direction. Between the slewing shaft J5 and a slewing actuator (not shown) located within the fixed base 31, an interlocking mechanism (not shown) is interposed, which, in conjunction with the actuator, forces the slewing shaft J5 (and therefore the slewing base 32) to rotate around the vertical axis. The structure of this slewing actuator and interlocking mechanism is conventionally known in the technical field of multi-stage boom crane equipment, so only a cover body 31c connected to the fixed base 31 and covering the actuator and interlocking mechanism is shown in Figures 12 and 13, and no further explanation is provided.

[0065] Multiple connecting blocks 21', which have the same structure as those fixed to the lower end of the mast M, are fixed to the outer circumference of the lower end of the base 31. The base 31 and the uppermost mast M are connected by bringing the connecting blocks 21' on the base 31 side into contact with the connecting block 21 on the upper end of the uppermost (highest position) mast M and fastening them together with bolts 25. In other words, the method of connecting the connecting blocks 21' on the base 31 side and the connecting block 21 on the upper end of the uppermost mast M is the same as the method of connecting the connecting blocks 21, 21' between adjacent masts M.

[0066] The slewing platform 32 comprises a slewing platform body 32m that fixes the upper end of the slewing axis J5, and a pair of left and right upright wall portions 32s integrally erected on the upper surface of the slewing platform body 32m, with the two upright wall portions 32s connected by a plurality of connecting walls 32c. On the other hand, the base of the first boom B1 is formed in a U-shape in cross-section so as to sandwich both upright wall portions 32s from both the left and right sides.

[0067] The left and right side walls 35 of the base of the first boom B1 and the upright wall 32s of the turntable 32 adjacent to each of them are connected via a pair of short cylindrical pivots J1 so as to be able to rotate relative to each other. Thus, the first boom B1 is supported on the turntable 32 so as to be able to luff and rotatably around the pivots J1. Therefore, the pivots J1 constitute a pivot support that pivotally supports the first boom B1 on the turntable 32 so as to be able to luff and rotatably.

[0068] The slewing axis J5 is formed in a cylindrical shape extending vertically, and a portion of the first relay pipe 38, which is held by the fixed base 31 and passes through the inside and outside of the fixed base 31, is inserted through its hollow section. The upstream end (i.e., lower end) of this first relay pipe 38 is liquid-tightly connected via a joint to the downstream end (i.e., upper end) of the connecting pipe 28 that runs along the uppermost mast M mentioned above. On the other hand, the portion of the first relay pipe 38 downstream of the slewing axis J5 (upper part) is drawn out to the outside of the first boom B1 via one of the left or right pivots J1, and its drawn-out end, i.e., the downstream end, is liquid-tightly connected to the second relay pipe 39, which will be described later and is located on the boom row BT side.

[0069] In the boom train BT, a hydraulic cylinder C1 is interposed between the first boom B1 and the boom support base BS (particularly the upright wall portion 32s of the slewing base 32, which will be described later) to forcibly raise and lower the first boom B1 relative to the boom support base BS. In addition, hydraulic cylinders C2 to C4 are interposed between adjacent booms in the boom train BT (i.e., between the first boom B1 at the base end and the next second boom B2, between the second boom B2 and the next third boom B3, and between the third boom B3 and the fourth boom B4 at the very front) to forcibly flex and lower them.

[0070] Furthermore, each of the hydraulic cylinders C1 to C4 is connected to a hydraulic supply device (including, for example, an oil tank, hydraulic pump, control valve, etc.) installed on the boom support base BS (particularly the fixed base 31 described later) via hydraulic piping (not shown) routed along the boom row BT. The supply and discharge of operating hydraulic pressure between this hydraulic supply device and each of the hydraulic cylinders C1 to C4 is controlled based on the operator's actions. The configuration of this hydraulic control system is also conventionally well known in the technical field of multi-stage boom crane devices.

[0071] Furthermore, a flexible discharge tube 37 capable of discharging ready-mix concrete from its tip is attached to the tip of the fourth boom B4. The base end of this discharge tube 37 and the downstream end of the aforementioned connecting pipe 28, which is installed along the mast M, are connected via the first relay pipe 38 provided on the boom support base BS and the second relay pipe 39, which is supported by each boom B1 to B4 of the boom row BT and arranged to run along each boom B1 to B4.

[0072] The second relay pipe 39 has a bent section in the middle that passes through the hollow pivots J2 to J4 which form the pivotal connection points between adjacent booms B1, B2; B2, B3; B3, B4, and is routed along the adjacent booms B1 to B4.

[0073] Furthermore, the upstream end of the second relay pipe 39 and the downstream end of the first relay pipe 38 are connected via a joint that allows them to rotate relative to each other around the axis of the pivot J1. In addition, joints are interposed in the middle of the second relay pipe 39, particularly near each of the aforementioned bends, to allow the upstream and downstream sections to rotate relative to each other. As a result of these joints, the second relay pipe 39 can smoothly follow the luffing and rotating of the first boom B1, and the bending and swinging of adjacent booms B1, B2; B2, B3; B3, B4.

[0074] Incidentally, the fixed base 31 is equipped with a plurality of first attachment points T1 that are used when the boom device 30 is lifted by a crane via the first cable W1 when the boom row BT is folded and in a horizontal position (see Figure 15) or a vertical position (see Figure 17), and which can be connected to the first cable W1. In this embodiment, the first cable W1 connected to each first attachment point T1 consists of a single wire 51 (see Figure 15) having eye-shaped connecting parts 51a at both ends. Since the crane used to lift the boom device 30 is conventionally known, the crane body is not shown in this embodiment; only the crane hook 80 suspended from the boom tip of the crane body via the wire is shown.

[0075] In this embodiment in particular, pairs of first mounting parts T1 are arranged on the fixed base 31 at intervals in a predetermined direction along the axis of the pivot J1 of the base of the first boom B1 (hereinafter simply referred to as the width direction of the boom row BT), with two sets of these pairs spaced apart in a horizontal direction perpendicular to the width direction (i.e., at a total of four locations on the fixed base 31, front, back, left, and right). Note that three or more sets of the pairs of first mounting parts T1 may be provided.

[0076] Therefore, when the boom assembly BT is positioned vertically and the boom device 30 is lifted by a crane via the first rope W1, if the boom support base BS is lifted via the same number of first ropes W1 through first mounting parts T1 distributed at least three or more locations at intervals from each other, the boom device 30 can be lifted in the most stable vertical position possible.

[0077] Each first mounting portion T1 includes, for example, a support wall 41w with support holes 42 provided on four support brackets 41 each fixed to a fixed base 31, and a connector 40 that is detachably connected to the support wall 41w. The connector 40 has a U-shaped connecting hook 43 having a pair of arms 43a that sandwich the support wall 41w, and a mounting shaft 44 that passes through both arms 43a and the support holes 42 of the support wall 41w so as to be rotatable relative to each other. A stopper-like grip 44a that engages with one of the arms 43a is integrally attached to one end of the mounting shaft 44, and a retaining member 45 (for example, a cotter pin) that engages with the other arm 43a is detachably locked to the other end of the mounting shaft 44.

[0078] Therefore, in order to attach the eye-shaped connecting portion 51a of the first cable W1 to the first mounting portion T1, for example, the connecting hook 43 can be removed from the support bracket 41 by removing the cotter pin 45 and pulling the mounting shaft 44 out of the support wall 41w, then connecting (inserting) it onto the connecting portion 51a of the first cable W1, and then reattaching the connecting hook 43 to the support bracket 41 via the mounting shaft 44 in the reverse order of the previous procedure. In this case, the mounting shaft 44 functions as a locking member that closes the gap between the two arms 43a of the connecting hook 43 when it is set on the connecting hook 43, thereby reliably maintaining the connection between the connecting hook 43 (and therefore the first mounting portion T1) and the connecting portion 51a at the end of the first cable W1.

[0079] Furthermore, the structure of the connector 40 that connects the connected portion 51a of the first cable W1 to the first mounting portion T1 is not limited to this embodiment, and any connector structure that can be attached to the fixed base 31 (support bracket 41) and can be attached to and detached from the connected portion 51a of the first cable W1 at any time is acceptable. For example, as a variation of the connector 40 not shown, a hook-shaped connecting hook with a hook opening that is always open, or a hook with a stopper piece that is pivotally supported on the hook body and has a stopper piece that can open and close the hook opening, and which is always elastically biased to a position that closes the hook opening, may be used as the connector.

[0080] Incidentally, the first mounting portion T1 described above is provided on the boom support base BS, particularly on the fixed base 31, via a support bracket 41, but it may also be provided directly on the fixed base 31. Alternatively, instead of providing the first mounting portion T1 on the fixed base 31, it may be provided directly on the slewing base 32 or via a support member such as a bracket.

[0081] Furthermore, a second attachment point T2 is provided in the middle of the first boom B1, which is used when lifting the boom device 30 via the second cable W2 with a crane while the boom row BT is in a sideways position, and which can be connected to the second cable W2. The second cable W2 connected to the second attachment point T2 is composed of a single wire 52 (see Figure 15) having eye-shaped connecting parts 52a at both ends, similar to the first cable W1.

[0082] The installation location of the second mounting section T2 is set such that, when the boom device 30 is lifted by a crane via the first and second ropes W1 and W2 in the lateral orientation of the boom row BT, the center of gravity of the entire boom device 30 (see reference numeral G in Figure 15) is located midway between the first and second mounting sections T1 and T2 in the longitudinal direction of the boom row BT.

[0083] The second mounting section T2 includes, for example, a connecting arm 46 that straddles the middle section of the first boom B1 from above, and a connector 40 that is detachably connected to the upper support wall 46w of the connecting arm 46. The pair of bifurcated legs 46a of the connecting arm 46 are pivotally supported 46p on the left and right side walls of the first boom B1, respectively. The connector 40 has the same structure as the connector 40 of the first mounting section T1 described above; that is, a U-shaped connecting hook 43 is rotatably supported via a mounting shaft 44 in a support hole provided in the upper support wall 46w.

[0084] Then, by removing the mounting shaft 44 and separating the connecting hook 43 from the upper support wall 46w, and then engaging the connecting hook 43 with the eye-shaped connecting portion 51a of the second cable W2, and then reattaching it to the upper support wall 46w via the mounting shaft 44, the second cable W2 can be detachably connected to the upper support wall 46w of the first boom B1 via the connector 40 and the connecting arm 46. Note that the connector 40 of the second mounting portion T2 is not limited to this embodiment, similar to the first mounting portion T1, and variations not shown, such as those described for the first mounting portion T1, can also be used.

[0085] Thus, as is clear from Figure 15, when the boom device 30 is lifted by a crane via the first and second ropes W1 and W2 while the boom row BT is in a lateral position, in this embodiment, the position of the first attachment part T1 on the boom support base BS is set such that the first rope W1 passes on the front side of the first boom B1, rather than the axis of the pivot point (pivot J1) of the boom support base BS relative to the first boom B1, when viewed from the side. In this case, although the first rope W1 is connected to the first attachment part T1 on the front side of the first boom B1 (right side in Figure 15), it may also be connected to the first attachment part T1 on the opposite side (left side in Figure 15).

[0086] Furthermore, the setting of the above-described position of the first mounting portion T1 is determined from the viewpoint of effectively suppressing the swinging of the boom row BT relative to the boom support base BS when lifting the boom device 30 in the above-described lateral position, as will be described later. However, if such a suppression effect is not considered important, the position of the first mounting portion T1 relative to the boom support base BS may be set such that the first rope W1 passes outside the pivot point (pivot J1) in a side view, i.e., on the left side in Figure 15.

[0087] Furthermore, the base of the first boom B1 is provided with a third mounting portion T3 for holding the second cable W2 to the first boom B1 in cooperation with the second mounting portion T2 when not in use. The third mounting portion T3 comprises, for example, an upper support wall 49 with a support hole 48 protruding from the upper surface of the base of the first boom B1, and a connector 40 detachably connected to the upper support wall 49. This connector 40 also has the same structure as the connector 40 of the first mounting portion T1 described above; that is, a U-shaped connecting hook 43 is rotatably supported via a mounting shaft 44 in a support hole provided in the upper support wall 49w. It should be noted that the connector 40 of the third mounting portion T3 is also not limited to this embodiment, and variations not shown, as described for the first mounting portion T1, can be adopted.

[0088] Furthermore, the third mounting section T3 mentioned above can be omitted. In that case, the second cable W2, which is not needed during concrete pouring work, can be removed from the second mounting section T2 (first boom B1), and the second cable W2 can be attached to the second mounting section T2 when assembling or disassembling the distributor D.

[0089] Next, an example of a boom device lifting auxiliary device that can be used when lifting the boom device 30 with a crane via a plurality of first ropes W1 while the boom row BT is in a vertical position, using the concrete supply distributor D of this embodiment, will be described with reference to Figures 17 and 18.

[0090] Specifically, as shown in Figure 17, the auxiliary device includes a first rope W1 connected to each of the first mounting parts T1, and a lifting rod 50 whose ends are detachably connected to the middle of at least one pair of the first ropes W1 when the boom device 30 is lifted by a crane in a vertical position via the first ropes W1. This lifting rod 50 is made of a rigid rod-shaped body that is longer than the maximum width of the boom row BT in a predetermined direction. The connection position of the lifting rod 50 with the first ropes W1 is set so that the lifting rod 50 is at a height position that allows it to straddle the boom device 30 near the upper end of the boom device 30 in a vertical position. A pair of triangular support plates 55 are fixed (e.g., welded) to both ends of the lifting rod 50, and a pair of support holes 56 are provided in the support plates 55 at intervals from each other.

[0091] Furthermore, the first rope W1 is divided into a first rope portion W1u above the suspension rod 50 and a second rope portion W1d below it. The connected portions 51a of these first and second rope portions W1u and W1d are detachably connected to the corresponding support plate 55 via a pair of upper and lower connectors 40. The pair of upper and lower connectors 40 have the same structure as the connectors 40 of the first mounting portion T1 described above; that is, U-shaped connecting hooks 43 are rotatably supported in a pair of support holes 56 of the support plate 55 via mounting shafts 44. Therefore, the operation of attaching and detaching the connectors 40 used for this suspension rod 50 is the same as that of the connectors 40 of the first mounting portion T1.

[0092] Furthermore, the structure of the connector 40 used for this suspension rod 50 is not limited to this embodiment, and variations not shown, such as those described in the first mounting portion T1, can also be adopted.

[0093] Furthermore, the auxiliary device includes an annular support 60 that, when the boom device 30 is lifted by a crane via multiple first ropes W1 while the boom train BT is in a vertical position as described above, is detachably connected in the vertical direction between the lifting rod 50 and the first attachment part T1 to at least two of the first ropes W1 (in the illustrated example, at a position near the upper end of the boom device 30) and surrounds all of the first ropes W1 and the boom train BT.

[0094] The annular support 60 is intended to prevent the boom train BT from tilting beyond a predetermined angle when the boom device 30 is lifted via multiple first ropes W1 in a vertical position of the boom train BT, with the first mounting portion T1 as the tilting pivot point. The annular support 60 is made of a flexible and sturdy annular body (for example, an endless wire rope, chain, etc.), and at least two connecting members 61 are detachably connected to the annular support 60 via connectors 40, each fixed (for example, by crimping, welding, bolting, etc.) to the middle of the first ropes W1 (the part closer to the lifting rod 50).

[0095] The connector 40 used to connect the annular support 60 has the same structure as the connector 40 of the first mounting portion T1 described above; that is, a U-shaped connecting hook 43 is rotatably supported in the support hole 62 of the connecting member 61 via a mounting shaft 44. Therefore, the operation of attaching and detaching the connector 40 used to connect the annular support 60 is the same as that of the connector 40 of the first mounting portion T1. It should be noted that the structure of the connector 40 used for the annular support 60 is also not limited to this embodiment, and variations not shown, such as those described for the first mounting portion T1, can be adopted.

[0096] Incidentally, the fixed base 31 of the boom support base BS is fixed and supported by a grease pump Gi as a grease injection unit, a distribution valve Vd connected to the grease pump Gi via a single grease base pipe GL0, and a plurality of grease pipes, namely the first to fourth grease pipes GL1 to GL4, which are connected in parallel to the grease base pipe GL0 (and therefore the grease pump Gi) via the distribution valve Vd. The grease pump Gi is equipped with, for example, a grease holding unit capable of storing a predetermined amount of grease, and a grease pushing means such as a piston that can manually pump the stored grease in the grease holding unit to the grease base pipe GL0, and its structure is conventionally known. The distribution valve Vd distributes the grease that flows into it to the first to fourth grease pipes GL1 to GL4 in equal volumes, and its structure is also conventionally known.

[0097] The first to fourth grease pipes GL1 to GL4 are mostly flexible, and their intermediate sections are bundled together and extend upward on the outside of the fixed base 31, and further pass through the inside of the slewing base 32 and the base of the first boom B1. Of the first to fourth grease pipes GL1 to GL4 that emerge from the base to the outside of the first boom B1, the first grease pipe GL1 in particular extends to the vicinity of the pivot J1, which serves as the pivot support for the first boom B1, and is capable of supplying grease to the lubricated parts around the pivot J1 (for example, the fitting part between the outer circumference of the pivot J1 and the bearing, and the fitting part between the inner circumference of the pivot J1 and the second relay pipe 39).

[0098] Furthermore, the second to fourth grease pipes GL2 to GL4, which extend outside the first boom B1, are fixed along the first boom B1 and extend to the tip of the first boom B1. At the tip of the first boom B1, the second grease pipe GL2 in particular extends to the vicinity of the pivot J2, which is the pivot connection point of the first and second booms B1 and B2, and can supply grease to the lubricated parts around the pivot J2 (for example, the fitting part between the outer circumference of the pivot J2 and the bearing, and the fitting part between the inner circumference of the pivot J2 and the second relay pipe 39). On the other hand, the third and fourth grease pipes GL3 and GL4 are fixed along the second boom B2 and extend to the tip of the second boom B2.

[0099] Furthermore, at the tip of the second boom B2, the third grease pipe GL3, in particular of the third and fourth grease pipes GL3 and GL4, extends to the vicinity of the pivot J3, which is the pivot connection point of the second and third booms B2 and B3, and is capable of supplying grease to the lubricated parts around the pivot J3 (for example, the fitting part between the outer circumference of the pivot J3 and the bearing, and the fitting part between the inner circumference of the pivot J3 and the second relay pipe 39). On the other hand, the fourth grease pipe GL4 is fixed along the third boom B3 and extends to the tip of the third boom B3.

[0100] Furthermore, at the tip of the third boom B3, the fourth grease pipe GL4 extends to the vicinity of the pivot J4, which is the pivot connection point of the third and fourth booms B3 and B4, and can supply grease to the lubricated parts around the pivot J4 (for example, the fitting part between the outer circumference of the pivot J4 and the bearing, and the fitting part between the inner circumference of the pivot J4 and the second relay pipe 39).

[0101] Thus, the first to fourth GL1 to GL4 extend to each of the lubricated parts of the booms B1 to B4 of the boom row BT, respectively, and supply grease to those lubricated parts.

[0102] As is clear from Figures 12 and 21, the first to fourth grease pipes GL1 to GL4 are individually branched off into the first to fourth backup pipes GE1 to GE4. These backup pipes GE1 to GE4 have grease inlets GEi1 to GEi4, which serve as backup grease injection points that allow grease to be individually injected into the corresponding backup pipes GE1 to GEi4. Each grease inlet GEi1 to GEi4 is equipped with a manual plug that normally closes it, and each plug can open and close the grease inlet GEi1 to GEi4 at any time. In addition, the first to fourth grease pipes GL1 to GL4 are equipped with a check valve Vc between the branching point where the backup pipes GE1 to GE4 branch off from the grease pipes GL1 to GL4 and the distribution valve Vd, to prevent backflow of grease from the grease pipes GL1 to GL4 to the distribution valve Vd.

[0103] Furthermore, as shown by the dashed line in Figure 21, a backup pipe GE0 for grease replenishment may be branched off from the middle of the grease base pipe GL0 (between the check valve Vc and the distribution valve Vd), and this backup pipe GE0 is equipped with a manually operated plug that is closed under normal conditions. By using this backup pipe GE0, grease can be replenished to the grease base pipe GL0 even in the event of a failure of the grease pump Gi.

[0104] Furthermore, in the grease supply system described above, the backup system (backup piping GE0, GE1~GE4 and check valve Vc) may be omitted.

[0105] Thus, according to the grease supply structure of this embodiment described above, grease can be supplied simultaneously from a single common grease pump Gi to multiple grease pipes GL1 to GL4 via a distribution valve Vd. As a result, even with the boom train BT still attached to the boom support base BS (i.e., without lowering each boom B1 to B4), grease can be quickly and easily supplied to the lubricated parts of the multiple booms B1 to B4 in the boom train BT, thereby reducing the time and effort required for grease replenishment. Furthermore, by making grease replenishment easier in this way, situations where grease is left unreplenished can be effectively avoided, which is also effective in preventing failures and reducing the durability of the boom device 30.

[0106] Furthermore, the grease piping is equipped with a check valve Vc between the branching point where backup pipes GE1 to GE4 branch off from the grease pipes GL1 to GL4 and the distribution valve Vd, which prevents grease from flowing back to the distribution valve Vd. This ensures that when grease is supplied from backup pipes GE1 to GE4 due to a malfunction of the distribution valve Vd, the supplied grease will not flow back to the distribution valve Vd and will not reach the lubricated parts of booms B1 to B4.

[0107] Next, the operation of the embodiment will be explained with reference to Figures 14 to 19.

[0108] When the distributor D of this embodiment is used, for example, at a building construction site, the lowest floor (e.g., the first floor) reinforced concrete floor slab FS1 is constructed in advance, and the floor slab FS1 has through holes H that connect the spaces above and below it. Then, the assembly process of assembling and installing the distributor D on the floor slab FS1 and the process of constructing the upper floor slab and its associated wall body based on the concrete pouring work performed using the installed distributor D are carried out in sequence.

[0109] Once the upper floor slabs FS2, FS3, etc., are constructed in this manner, the entire distributor D is moved onto the upper floor slabs in order to construct the next upper floor slabs (this process is called "relocation" on site). The assembly process and relocation process of the distributor D described above will now be explained in order. [Assembly Process] First, as illustrated in Figure 14(A), the base device 10 of the distributor D is suspended by a crane and lowered to approximately the same level as the floor slab FS1, and the outriggers 16 at the deployed position 16A are placed on the floor slab FS1, and these outriggers 16 are fixed with conventionally known fixing means (for example, anchor bolts that penetrate the outriggers 16).

[0110] Next, as illustrated in Figure 14(B), the mast device 20, which has been assembled in advance at another location along with one or more masts M, is suspended by a crane and placed on the base device 10 (on the rectangular tube portion 11b of the base frame 11), and then connected to the base device 10 via connecting blocks 21, 21' and bolts 25.

[0111] Next, as shown in Figure 14(C), the boom device 30, which had been pre-assembled in a separate location as an assembly of the boom row BT and boom support base BS, is connected to the lower ends of the first and second ropes W1 and W2 at the fixed base 31 and the first and second mounting parts T1 and T2 on the first boom B1, respectively, with the folded boom row BT in a nearly horizontal, sideways position. Then, the upper parts of the first and second ropes W1 and W2 are lifted by a crane and placed on the upper end of the uppermost mast M of the mast device 20, as shown in Figure 14(D), and connected to the uppermost mast M via connecting blocks 21, 21' and bolts 25. This connection work is performed by a worker on a work platform 24 in coordination with the crane operator.

[0112] Subsequently, the first rope W1 is removed from the crane hook 80 and the first attachment point T1 and stored in a separate storage location. The upper end of the second rope W2 is removed from the crane and attached to the third attachment point T3, while the lower end remains connected to the second attachment point T2.

[0113] Furthermore, the downstream end (upper end) of the connecting pipe 28 fixed to the mast M is liquid-tightly connected via a joint to the upstream end (lower end) of the first relay pipe 38 on the fixed base 31 side, and this connection work is also performed by a worker on the workbench 24. On the other hand, the upstream end (lower end) of the connecting pipe 28 is liquid-tightly connected via a joint to a concrete pumping pipe extending from an external concrete pump, although this is not shown in the diagram. This allows fresh concrete from the concrete pump to be sequentially pumped and supplied to the connecting pipe 28, the first and second relay pipes 38 and 39, and the discharge tube 37.

[0114] Thus, once the installation of the distributor D on the lowest floor slab FS1 is complete, the distributor D can supply ready-mix concrete from the discharge tube 37 at the end of the boom row BT to the desired pouring location by appropriately bending the booms B1 to B4 of the boom row BT and rotating the slewing platform 32 (and therefore the boom row BT). This makes it possible to sequentially construct the floor slab FS2 and walls of the next floor, and even the floor slab FS3 and walls of the floor after that.

[0115] Once the upper floor slabs FS2, FS3 and walls are stacked in this manner, the process moves to the next relocation step, in which the entire distributor D is moved onto, for example, floor slab FS2, in order to construct the upper floor slab FS4, etc. [Refilling process] In this process, for example, the connecting pipe 28 fixed to the mast M is disconnected from the concrete pumping pipe connected to the concrete pump, and the outriggers 16 are released from their attachment to the floor slab FS1. Then, as shown in Figure 16(E), the folded boom row BT is swung upright until it is in a nearly vertical position, and in this state, the lower ends of the four first ropes W1 are connected to the four first attachment points T1 of the boom support base BS (fixing base 31). Then, the upper ends of the first ropes W1 are attached to the crane hook 80, and the entire distributor D is lifted by the crane.

[0116] Next, as shown in Figure 16(F), the outriggers 16 are rotated to the stowed position 16B, thereby preventing the outriggers 16 from interfering with the area around the through-hole H in the upper floor slab FS2 when the distributor D is raised. Then, the entire distributor D is lifted and raised by a crane until the base device 10 is at approximately the same level as the upper floor slab FS2.

[0117] After the ascent, as shown in Figure 16(G), the outriggers 16 are extended again to the deployed position 16A, and then placed and fixed on the floor slab FS2 of the floor above. Next, the lower ends of all the first cables W1 are removed from the first mounting part T1 of the fixing base 31 and stored in another storage location. The upper end of the extension pipe 28' that extends downward is connected and fixed to the upstream end (lower end) of the connecting pipe 28 fixed to the mast M, and the middle of the extension pipe 28' is supported by fixing means 81 to the beam around the through hole H of the floor slab of the floor below (for example, floor slab FS2). Then, by connecting the concrete pumping pipe connected to the concrete pump to the lower end of the extension pipe 28', ready-mixed concrete can be sequentially pumped and supplied to the connecting pipe 28, the first and second relay pipes 38 and 39, and the blowing tube 37.

[0118] Thus, once the transfer work to the upper floors of Distributor D is complete, Distributor D can then lower the first boom B1 of the boom row BT, appropriately bend booms B1 to B4 relative to each other, and rotate the turntable 32 (and therefore boom row BT), thereby supplying ready-mix concrete from the discharge tube 37 at the tip of boom row BT to the desired pouring location on the upper floors. This makes it possible to construct the floor slab FS4 and walls on the upper floors.

[0119] Therefore, by sequentially performing the above-mentioned repositioning process as the floor slab FS increases in height, it becomes possible to construct mid-rise and high-rise buildings without difficulty using the same distributor D.

[0120] As described above, in this embodiment, a first attachment part T1, which can be connected to the first rope W1 and is used when lifting the boom device 30 via the first rope W1 with a crane while the folded boom train BT is in a horizontal or vertical position, is provided on the boom support base BS (fixed base 31 in the illustrated example). Therefore, the boom device 30 can be lifted via the first rope W1 with a crane in the form of an assembled unit consisting of the boom train BT and the boom support base BS. This eliminates the need to assemble the boom device 30 on the high mast device 20 as in the conventional method, thereby improving the ease of assembly of the boom device 30.

[0121] Furthermore, especially during so-called repositioning operations where the boom device 30 is lifted while the boom train BT is in a vertical position, the entire boom device 30 is lifted particularly by the boom support base BS via the multiple first mounting parts T1 and multiple first ropes W1 of the boom support base BS. As a result, the load on the connection between the base end of the boom train BT (base of the first boom B1) and the boom support base BS during lifting can be effectively reduced compared to when the boom train BT is lifted in the conventional manner. This simplifies the structure of the connection and, consequently, reduces costs.

[0122] Furthermore, the boom support base BS of this embodiment comprises a fixed base 31 fixed to the upper part of the mast device 20, and a slewing base 32 that is rotatably supported around a slewing axis J5 on the fixed base 31, which pivotally supports the base of the first boom B1 so as to be able to luff and rotatably support it, with a first mounting portion T1 provided on the fixed base 31. As a result, the fixed base 31 of the boom support base BS is lifted by the first rope W1, which reduces the load on the slewing mechanism (i.e., slewing axis J5, slewing bearing 31b, etc.) that rotatably supports the fixed base 31 on the slewing base 32, thereby simplifying the structure of the slewing mechanism and, consequently, reducing costs.

[0123] In another embodiment, a second attachment point T2 is provided in the middle of the first boom B1, which is used when lifting the boom device 30 via the second rope W2 with a crane, especially when the boom train BT is in a lateral position, and is connectable to the second rope W2. This allows the boom device 30 to be lifted by a crane via the first and second ropes W1 and W2 (and thus with a long support span in the horizontal direction) when the boom train BT is in a lateral position, thus ensuring stable lifting support and improving work efficiency.

[0124] Furthermore, in this embodiment, when the boom device 30 is lifted by a crane via the first and second ropes W1 and W2 while the boom train BT is in a lateral position, the position of the first attachment part T1 on the boom support base BS is set such that, in a side view, the first rope W1 passes on the front side of the first boom B1, relative to the axis of the pivot point (i.e., pivot J1) of the boom support base BS for the first boom B1. As a result, during the lifting process of the boom device 30 while the boom train BT is in a lateral position, the moment exerted on the boom support base BS by the lifting load applied by the first rope W1 via the first attachment part T1 effectively suppresses the opening and swinging of the boom train BT relative to the boom support base BS. Thus, safety of the work is improved with a simple opening suppression structure that utilizes the lifting load.

[0125] Furthermore, the base of the first boom B1 is provided with a third mounting section T3 that works in cooperation with the second mounting section T2 to hold the second rope W2 to the first boom B1 when not in use. This allows the second rope to be held on the first boom while preventing it from interfering with the concrete pouring work, even if one end of the second rope W2 is left connected to the second mounting section T2 when not in use, by connecting and holding the other end of the second rope W2 to the third mounting section T3. Moreover, when using the second rope W2 again, the effort of connecting one end to the second mounting section T2 is eliminated, thereby increasing work efficiency.

[0126] Furthermore, in order to perform the aforementioned repositioning work, when the boom row BT is in a vertical position and a first rope W1 is connected to each of the first mounting parts T1, and when the boom device 30 in the vertical position is lifted by a crane via these first ropes W1, it is desirable to connect both ends of a lifting rod 50 that is longer in the width direction than the maximum width of the boom row to the middle of a pair of first ropes W1 that are arranged in the width direction of the boom row BT (especially above the upper end of the boom row BT). In this case, the pair of first ropes W1 to which both ends of the lifting rod 50 are connected in the middle are subjected to the bracing action of the lifting rod 50 interposed between the two first ropes W1, thereby ensuring that excessive interference of the two first ropes W1 with the boom row BT is prevented.

[0127] Furthermore, when lifting the vertically oriented boom device 30 with a crane via the first rope W1 for the above-mentioned repositioning work, it is desirable to connect an annular support 60 that surrounds all of the first ropes W1 and the boom row BT to at least one of the first ropes W1 in the middle (especially the part closer to the lifting rod 50) between the lifting rod 50 and the first mounting part T1 in the vertical direction. In this case, the annular support 60 can suppress the boom row BT from tilting excessively (i.e., beyond a predetermined angle) with the first mounting part T1 as the tilting fulcrum, thereby effectively preventing the boom row BT from tilting too much and tipping over when the boom device 30 is lifted.

[0128] Furthermore, when lifting the vertically oriented boom device 30 described above with a crane, the use of both the lifting rod 50 and the annular support 60 may be omitted. It is also possible to use only the lifting rod 50 without using the annular support 60. Moreover, it is possible to use only the annular support 60 without using the lifting rod 50, in which case, for example, the vertically oriented boom device 30 can be lifted by only one first rope W1 via one first attachment part T1 on the boom support base BS side, and the annular support 60 connected to the first rope W1 can be used to prevent the boom device 30 from tipping over.

[0129] Furthermore, in the implementation of the [repositioning process], the embodiment shows a work configuration in which the boom device 30 in a vertical position is lifted by a crane via the first cable W1, as shown in Figure 16. However, even if the boom device 30 is lifted via the first and second cables W1 and W2 while in a horizontal position, the repositioning work may be performed with the boom device 30 in a horizontal position, as long as the boom device 30 does not interfere with the already constructed structure (for example, the upper floor slab, etc.).

[0130] Although embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various embodiments can be implemented within the scope of the present invention.

[0131] For example, in this embodiment, the mast device 20 is made up of two masts M arranged in tandem and connected to each other, and the relocation work of the boom device 30 is performed together with the mast device 20 and the base device 10. However, depending on the length of the masts M and the work conditions at the site, the mast device 20 may be made up of one mast M, or three or more masts M may be connected in tandem to make up the mast device 20.

[0132] In the above embodiment, multiple connecting blocks 21, 21' fixed to the outer circumference of adjacent ends of adjacent masts M at intervals in the circumferential direction are arranged vertically adjacent to each other, facing and abutting each other in the vertical direction, and their abutting surfaces are joined together with bolts 25. However, other connecting means (e.g., welding, riveting, pinning, etc.) can also be used as the connecting means. Alternatively, the connecting blocks 21, 21' may be arranged horizontally (i.e., facing in the circumferential direction) and fixed pins may be used to connect the abutting surfaces.

[0133] Furthermore, in this embodiment, the deployment position 16A of the outrigger 16 in the base device 10 is shown to be set to any of the three deployment positions 16A0, 16A1, and 16A2. However, the deployment position 16A of the outrigger 16 may be set to one pattern, or to two or more patterns. If the number of deployment positions 16A is set to one or two patterns, which is fewer than the three patterns in this embodiment, the number of pin insertion holes provided on the base side of the outrigger 16 can be reduced to one or two compared to this embodiment.

[0134] Furthermore, although the above embodiment illustrates a configuration in which the outrigger 16 is rotated manually between the stowed position 16B and the deployed position 16A, the rotation of the outrigger 16 may be performed automatically by an actuator (not shown) installed between the outrigger 16 and the base body 10m.

[0135] Furthermore, in the above embodiment, the boom row BT in the boom device 30 was shown to be composed of first to fourth booms B1 to B4 arranged in series and capable of refracting and swinging relative to each other. However, the boom row BT only needs to consist of at least two booms connected together, and is not limited to the number of booms in the embodiment.

[0136] Furthermore, in the above embodiment, conventional length adjustment aids such as chain blocks are not used with respect to the first and second ropes W1 and W2. However, such length adjustment aids may be used to connect at least a portion of the first and second ropes W1 and W2 to at least a portion of the first and second mounting portions T1 and T2 while making the length adjustable.

[0137] Furthermore, although the above embodiment shows the upper and lower frames 12 and 13 connected to the base frame 11 via enclosure frames 14k and 15k of the upper and lower bearings 14 and 15, the upper and lower frames 12 and 13 may be directly connected to the base frame 11, or connected via other members separate from the enclosure frames 14k and 15k.

[0138] In the above embodiment, the upper and lower bearings 14 and 15 are composed of bearing bodies 14b and 15b and enclosure frames 14k and 15k connected thereto, and the bearing bodies 14b and 15b are connected to the upper and lower frames 12 and 13 via the enclosure frames 14k and 15k. However, the enclosure frames 14k and 15k may be omitted, and the upper and lower frames 12 and 13 may be directly connected (i.e., without using the enclosure frames 14k and 15k) to mounting surfaces provided on the outer parts of the bearing bodies 14b and 15b.

[0139] Furthermore, in the above embodiment, in the assembly process of the distributor D, as shown in Figures 14(A) to (D), after the base device 10 and the mast device 20 are installed on site, the boom row BT of the boom device 30, which is in a horizontal position (first boom B1 in the embodiment), and the boom slewing platform BS (fixed platform 31 in the embodiment) are suspended by a crane via the first and second ropes W1 and W2 and the first and second attachment parts T1 and T2, and the fixed platform 31 is connected to the uppermost mast M in this suspended state. In contrast, in the assembly process of distributor D, as shown in Figure 14(A)(B)⇒Figure 19(C')(D'), after installing the base device 10 and mast device 20 on site, the fixing base 31 of the boom device 30, in which the boom row BT is oriented vertically, may be suspended by a crane via the four first ropes W1 and the first attachment part T1, and the fixing base 31 and the uppermost mast M may be connected in this suspended state.

[0140] Furthermore, in the above embodiment, in the assembly process of the distributor D, as shown in Figures 14(A) to (D), the base device 10 is first installed on the floor slab FS1 of the lowest level of the site (for example, the basement or first floor), and then the construction of the mast device 20 and the assembly of the boom device 30 above it are carried out. However, it is also possible to construct a lower level slightly above the lowest level (for example, the floor slab FS2 or FS3 in the embodiment) before the assembly process of the distributor D (and therefore without using the distributor D), and then start the assembly process by first installing the base device 10 on the upper floor slab FS2 or FS3.

[0141] Furthermore, in the base body 10m of the base device 10 of the above embodiment, as simply shown in Figures 20(A) and (B), the upper bearing 14 is connected to the adjacent end of adjacent upper frames 12 such that at least a portion of the upper bearing 14 is located inward of the intersection point O of the extension lines of the outer surfaces along the longitudinal direction of adjacent upper frames 12 in a plan view, and the lower bearing 15 is connected to the adjacent end of adjacent lower frames 13 such that at least a portion of the lower bearing 15 is located inward of the intersection point O of the extension lines of the outer surfaces along the longitudinal direction of adjacent lower frames 13 in a plan view. In contrast, as another embodiment of the present invention, as simply shown in Figures 20(C) and (D), the structure is such that at least a portion of the upper bearing 14 is located on the side of the intersection point O' of the outer surfaces along the longitudinal direction of adjacent upper frames 12 in a plan view (i.e., on the side of the rectangular tube portion 11b, in other words, on the side of the center of the base body 10m), and the structure is such that at least a portion of the lower bearing 15 is located on the side of the adjacent ends of adjacent lower frames 13 in a plan view (i.e., on the side of the rectangular tube portion 11b, in other words, on the side of the center of the base body 10m), and the structure is such that at least a portion of the lower bearing 15 is located on the side of the intersection point O' of the outer surfaces along the longitudinal direction of adjacent lower frames 13 in a plan view (i.e., on the side of the rectangular tube portion 11b, in other words, on the side of the center of the base body 10m), and the lower bearing 15 is located on the side of the adjacent ends of adjacent lower frames 13.

[0142] In this alternative embodiment, for example, adjacent ends of two adjacent upper frames 12 are directly fixed to each other (e.g., by welding, bolting, etc.), and the upper part of the upper bearing 14 is fixed to the lower surface of the adjacent ends of the upper frames 12 (e.g., by welding, bolting, etc.). Also, adjacent ends of two adjacent lower frames 13 are directly fixed to each other (e.g., by welding, bolting, etc.), and the upper part of the lower bearing 15 is fixed to the upper surface of the adjacent ends of the lower frames 13 (e.g., by welding, bolting, etc.).

[0143] Furthermore, this alternative embodiment of the base device 10 can achieve essentially the same effects and advantages as the base device 10 of the previously described embodiment. [Explanation of Symbols]

[0144] D······Distributor M...Must 10..Base unit 21,21′···Connecting block 22,22′··· Contact surfaces of connecting blocks 22d, 22t... recessed, convex 25. Bolt 26. Opposite side of the connecting block to the mast 21t...Protrusion 27... Support hole 29·····Clearance 30.. Boom device

Claims

1. A concrete supply distributor comprising a base device (10), a mast device (20) having a single mast (M) supported upright on the base device (10) or a plurality of masts (M) supported upright and connected to each other in a longitudinal order, and a boom device (30) mounted on the uppermost mast (M), Multiple connecting blocks (21, 21') are fixed to the outer circumference of the end of the mast (M) facing the end of the boom device (30), and to the outer circumference of the end of the boom device (30) facing the end of the mast (M), with spacing between them in the circumferential direction. These connecting blocks (21, 21') are in contact with each other, and protrusions (22t) and recesses (22d) provided on one and the other contact surfaces (22, 22') are engaged with each other in such a way that they can position the mast (M) and the boom device (30) facing it, and suppress misalignment between the mast (M) and the boom device (30) in the direction along the contact surfaces (22, 22'). A concrete supply distributor characterized in that the connecting blocks (21, 21') are arranged such that their contact surfaces (22, 22') protrude beyond the end faces of the mast (M) and boom device (30) to which they are fixed around the outer circumference of their ends, thereby creating a clearance (29) between the opposing end faces of the mast (M) and boom device (30).

2. A concrete supply distributor comprising a base device (10), a mast device (20) having a single mast (M) supported upright on the base device (10) or a plurality of masts (M) supported upright and connected to each other in a longitudinal order, and a boom device (30) mounted on the uppermost mast (M), Multiple connecting blocks (21, 21') are fixed to the outer circumference of the end of the mast (M) facing the end of the base device (10), and to the outer circumference of the end of the base device (10) facing the end of the mast (M), with spacing between them in the circumferential direction. These connecting blocks (21, 21') are in contact with each other, and protrusions (22t) and recesses (22d) provided on one and the other contact surfaces (22, 22') are engaged with each other in such a way that they can position the mast (M) and the base device (10) facing it, and suppress misalignment between the mast (M) and the base device (10) in the direction along the contact surfaces (22, 22'). A concrete supply distributor characterized in that the connecting blocks (21, 21') are arranged such that their contact surfaces (22, 22') protrude beyond the end faces of the mast (M) and base device (10) to which they are fixed around the outer circumference of their ends, thereby creating a clearance (29) between the opposing end faces of the mast (M) and base device (10).

3. Multiple connecting blocks (21, 21') are fixed to the outer circumference of the end of the mast (M) facing the end of the base device (10), and to the outer circumference of the end of the base device (10) facing the end of the mast (M), with spacing between them in the circumferential direction. These connecting blocks (21, 21') are in contact with each other, and protrusions (22t) and recesses (22d) provided on one and the other contact surfaces (22, 22') are engaged with each other in such a way that they can position the mast (M) and the base device (10) facing it, and suppress misalignment between the mast (M) and the base device (10) in the direction along the contact surfaces (22, 22'). The concrete supply distributor according to claim 1, characterized in that the connecting blocks (21, 21') are arranged such that their contact surfaces (22, 22') protrude beyond the end faces of the mast (M) and the base device (10) to which they are fixed around the outer circumference of their ends, and a clearance (29) exists between the opposing end faces of the mast (M) and the base device (10).

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