Concrete supply distributor

Abstract

To contribute to increased efficiency of connection work of masts by quickly and accurately performing the connection work in a concrete supply distributer comprising a base device, a mast device having a plurality of masts supported in an erected state and connected with each other in a vertical line state on the base device, and a boom device mounted on the uppermost mast.SOLUTION: A plurality of connection blocks 21, 21' arranged in a circumferential direction with an interval from each other are fixed to at least one end outer periphery in an axial direction of each mast M. Connection blocks 21, 21' which are respectively fixed to the end outer peripheries being adjacent to each other of a pair of neighboring masts M are in contact with each other. A protrusion 22t and a recess 22d respectively provided in one and the other of the contact faces 22, 22' are engaged with each other so as to position each of the pair of neighboring masts M and suppress positional displacement of the pair of masts M from one another in a direction along the contact faces 22, 22'.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a concrete supply distributor comprising a base device, a mast device having a plurality of masts supported in an upright position on the base device and connected to one another in a tandem, and a boom device mounted on the uppermost mast. [Background technology]

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

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 60-184167 Summary of the Invention [Problem to be solved by the invention]

[0004] In the distributor shown in Patent Document 1, connecting flanges are provided on the outer peripheries of the adjacent ends of a pair of adjacent masts, and these connecting flanges are overlapped and bolted together to integrally connect the pair of adjacent masts.

[0005] However, because the contact surfaces of the connecting flanges are flat, it is not easy to align the flanges when they are brought together. Even after alignment, the contact surfaces tend to slide against each other, causing misalignment. This makes it difficult to quickly and accurately perform the joining work, including the alignment work, between the masts, resulting in poor work efficiency.

[0006] SUMMARY OF THE INVENTION The present invention has been proposed in view of the above, and has as its object to provide a distributor for supplying concrete that can solve the problems of the conventional structure with a simple structure. [Means for solving the problem]

[0009] In order to achieve the above purpose, The present invention relates to a concrete distributor comprising a base device, a mast assembly having a plurality of masts supported in an upright position on the base device and connected in a tandem with one another, and a boom assembly mounted on the highest mast, wherein a plurality of connecting blocks arranged at intervals in the circumferential direction are fixed to the outer periphery of at least one axial end of each mast, and the connecting blocks fixed to the outer peripheries of the adjacent ends of a pair of adjacent masts abut against each other, and a convex portion and a concave portion provided on one and the other of the abutting surfaces respectively position the pair of adjacent masts relative to each other. The pair of connecting blocks engage with each other so as to suppress mutual positional deviation of the pair of masts in the direction along the contact surfaces and are connected to each other by bolts passing through both connecting blocks, and the connection maintains the engagement between the convex portions and concave portions of both connecting blocks, and the bolts include at least a first bolt passing through the tip surface of the convex portion and the bottom surface of the concave portion abutting against the tip surface, a second bolt passing through the contact surfaces of both connecting blocks on one side of the convex portion, and a third bolt passing through the contact surfaces of both connecting blocks on the other side of the convex portion. 1st It is characterized by:

[0010] The present invention also provides a concrete distributor comprising a base device, a mast assembly having a plurality of masts supported in an upright position on the base device and connected to one another in a tandem arrangement, and a boom assembly mounted on the highest mast, wherein a plurality of connecting blocks arranged at intervals in the circumferential direction are fixed to the outer periphery of at least one axial end of each mast, and the connecting blocks fixed to the outer peripheries of the adjacent ends of a pair of adjacent masts abut against each other, and the connecting blocks are fixed to one and the other of the abutting surfaces. The convex and concave portions provided on each of the connecting blocks engage with each other so as to position the pair of adjacent masts relative to each other and to suppress positional deviation of the pair of masts relative to each other in the direction along the corresponding contact surfaces, and the pair of connecting blocks that abut each other are connected to each other by bolts that pass through both connecting blocks, and this connection maintains the engagement of the convex and concave portions of both connecting blocks, and each connecting block is provided on its surface facing the mast with a protrusion that fits into a support hole provided in the end of the mast with which the connecting block abuts. 2 The characteristics of this system are as follows:

[0011] The present invention also provides a concrete distributor comprising a base device, a mast assembly having a plurality of masts supported in an upright position on the base device and connected to one another in a tandem arrangement, and a boom assembly mounted on the highest mast, wherein a plurality of connecting blocks arranged at intervals in the circumferential direction are fixed to the outer periphery of at least one axial end of each mast, and the connecting blocks fixed to the outer peripheries of the adjacent ends of a pair of adjacent masts abut against each other, and protrusions and recesses are provided on one and the other of the abutting surfaces, respectively. The projections and recesses engage with each other to position the pair of adjacent masts and to prevent misalignment of the pair of masts in the direction along the contact surfaces, and the pair of connecting blocks that abut each other are connected to each other by bolts that pass through both connecting blocks, and this connection maintains the engagement of the projections and recesses of both connecting blocks, and the connecting blocks are arranged so that the abutment surfaces protrude from the end faces of the masts to which they are fixed on the outer peripheries of their ends, and a clearance exists between the opposing end faces of the adjacent masts. 3 It is characterized by the following. [Effects of the Invention]

[0012] Features 1 to 3According to the concrete distributor, a plurality of connecting blocks are fixed to the outer peripheries of both ends of each mast, spaced apart in the circumferential direction, and the fixed connecting blocks abut against the outer peripheries of the adjacent ends of a pair of adjacent masts, with convex and concave portions on one and the other of the abutment surfaces engaging with each other to position the pair of adjacent masts and prevent misalignment of the pair of masts along the abutment surfaces. When the fixed connecting blocks are abutted against the outer peripheries of the adjacent ends of the pair of adjacent masts to connect the pair of adjacent masts, the convex and concave portions on one and the other of the abutment surfaces engage with each other to easily position the pair of adjacent masts, and the convex and concave portions can be reliably prevented from misaligning the pair of masts along the abutment surfaces. This allows the masts to be connected quickly and accurately, greatly contributing to improved work efficiency.

[0014] Moreover, No. 1 According to the feature of the present invention, the bolts include a first bolt that penetrates the tip surface of the convex portion and the bottom surface of the recessed portion that abuts the tip surface, a second bolt that penetrates the abutment surfaces of the two connecting blocks on one side of the convex portion, and a third bolt that penetrates the abutment surfaces of the two connecting blocks on the other side of the convex portion.Therefore, the tightening effect of the first to third bolts on the abutment surfaces is more strongly exerted at the engagement portions between the convex and recessed portions and their surrounding areas, and therefore the interlocking effect of the concave-convex engagement portions is enhanced, making it possible to more reliably prevent misalignment of a pair of adjacent masts while firmly joining the two masts.

[0015] Also, 2According to the feature of the present invention, the surface of each connecting block facing the mast is provided with a protrusion that fits into a support hole provided at the end of the mast with which the connecting block contacts. This not only makes it easier to position each connecting block on the mast, but also increases the connecting strength between each connecting block and the mast. For example, when welding is used as the connecting means, the welding area can be advantageously enlarged.

[0016] Also, 3 According to the feature of (a), the connecting blocks are arranged so that the abutment surfaces extend beyond the end faces of the masts to which they are fixed, and since there is a clearance between the opposing end faces of adjacent masts, the connecting blocks can be accurately abutted against each other without being affected by machining errors in the mast end faces, thereby enabling the masts to be accurately connected to each other while reducing the machining costs of the masts. [Brief explanation of the drawings]

[0017] [Figure 1] 1A is a longitudinal sectional view showing an example of an operating state of a distributor according to an embodiment of the present invention, and FIG. 1B is a view taken along the arrow 1B in FIG. 1A. [Figure 2] Overall side view of the base device (enlarged view of the area indicated by arrow 2 in Figure 1(A)) [Figure 3] 3 is a plan view of the base device (viewed from the direction of arrow 3 in FIG. 2); [Figure 4] Partially broken, enlarged plan view of the area indicated by the arrow 4 in Figure 3 [Figure 5] (A) is a cross-sectional view taken along line 5A-5A in FIG. 4, and (B) is a cross-sectional view taken along line 5B-5B in FIG. 4. [Figure 6] 6(a) is an exploded plan view of the main part of the base body and the outriggers as seen from the same side as in FIG. 4, (b) is a cross-sectional view taken along line bb in FIG. 6(a), and (c) is a cross-sectional view taken along line cc in FIG. 6(a). [Figure 7] Overall perspective view of the base device [Figure 8] A simplified plan view showing the relationship between the upper and lower connecting pins and the upper and lower pin insertion holes that are in an operational state when the outriggers are stored and deployed. [Figure 9] Side view of the main part of the mast device [Figure 10] (A) is a cross-sectional view taken along line 10A-10A in FIG. 9, (B) is a cross-sectional view taken along line 10B-10B in FIG. 9, and (C) is a cross-sectional view taken along line 10C-10C in FIG. 9. [Figure 11] FIG. 1 is an enlarged side view of the boom assembly with the boom array in a horizontal position (see arrow 11 in FIG. 1). [Figure 12] (A) is a cross-sectional view taken along line 12A-12A in FIG. 11, and (B) is a cross-sectional view taken along line 12B-12B in FIG. 12(A). [Figure 13] Overall perspective view of the boom support base [Figure 14] Schematic diagram of the distributor's assembly process [Figure 15] (A) is an enlarged side view of the portion indicated by the arrow 15A in FIG. 14, and (B) is a view indicated by the arrow 15B in FIG. 15(A). [Figure 16] Schematic diagram of the distributor's [refilling process] [Figure 17] (A) is an enlarged side view of the portion indicated by the arrow 17A in FIG. 16(F), and (B) is a view indicated by the arrow 17B in FIG. 17(A). [Figure 18] (A) is an enlarged side view of the portion indicated by the arrow 18A in FIG. 17(B), and (B) is an enlarged side view of the portion indicated by the arrow 18B in FIG. 17(A). [Figure 19] A schematic diagram showing variations in the latter half of the distributor's [refilling process] [Figure 20] 20(A) and 20(D) are schematic diagrams showing the mutual coupling relationship between the upper and lower frames and the upper and lower bearings, in which (A) is a schematic plan view of one embodiment, (B) is a schematic side view of one 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] FIG. 1 is a circuit diagram showing an outline of a grease supply system according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

[0019] The concrete supply distributor D is used to receive ready mixed concrete for constructing various parts of the structure (such as floor slabs and walls) 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 parts of the casting site located at an elevated position. An example of its use is shown in Figure 1.

[0020] This distributor D comprises a base device 10 serving as a foundation, a height-adjustable mast device 20 supported in an upright state on this base device 10, and a boom device 30 mounted on the mast device 20. Next, examples of each of the devices 10, 20, 30 will be described in order with reference to Figs. 2 to 13.

[0021] 2 to 7, the base device 10 includes a base body 10m and an outrigger 16 having a base portion 16b rotatably supported on the base body 10m via a rotation support shaft 17. The outrigger 16 is rotatable between a storage position 16B that fits within the base body 10m and a predetermined deployment position 16A that projects outward from the storage position 16B (i.e., outside the base body 10m). The base body 10m is formed of a rigid frame made up of multiple metal frames.

[0022] That is, the base main body 10m includes a base frame 11 serving as a central skeleton. This base frame 11 integrally comprises a rectangular cylindrical portion 11b having a rectangular cross section and extending vertically, and four vertical wall portions 11a extending radially from the tops of the rectangular cylindrical portion 11b on the front, rear, left, and right sides. As each vertical wall portion 11a has a complex three-dimensional shape as is clear from FIGS. 2 to 7, it is formed by integrally connecting (for example, by welding, bolting, etc.) a plurality of wall elements to each other. Note that a bracket 11ab with a locking hole is fixed (for example, by welding, etc.) to the upper part of each vertical wall portion 11a for locking the lower end of a suspension wire when the base device 10 is suspended independently by a crane (see, for example, FIG. 14(A)).

[0023] In particular, the rectangular tube portion 11b in this embodiment has a cross-sectional shape that is substantially the same as that of a mast M (described later) of the mast assembly 20, and a plurality of connecting blocks 21 are fixed at intervals to the outer periphery of the upper end of this rectangular tube portion 11b. These connecting blocks 21 and a plurality of connecting blocks 21' fixed to the outer periphery of the lower end of the lowest mast M are used to connect the lowest mast M and the rectangular tube portion 11b (and therefore the base body 10m) to each other, as will be described later.

[0024] The base body 10m also includes the above-mentioned base frame 11, 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 to correspond to 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 include cylindrical bearing bodies 14b, 15b and surrounding frames 14k, 15k fixed (for example, welded) to the bearing bodies 14b, 15b and surrounding their outer peripheries. A plurality of support legs 13a that can be grounded are protruded from the underside of the lower frame 13.

[0025] Thus, the upper bearing 14 is structured to be coupled to the adjacent ends of adjacent upper frames 12 so as to connect them, so that the upper bearing 14 is coupled to the adjacent ends of the upper frames 12 so that at least a portion of the upper bearing 14 is located inward of the intersection O of the extension lines of the outer surfaces of adjacent upper frames 12 along the longitudinal direction in a plan view (i.e., toward the square tube portion 11b, in other words, toward the center of the base main body 10m). On the other hand, the lower bearing 15 is structured to be coupled to the adjacent ends of adjacent lower frames 13 so as to connect them, so that the lower bearing 15 is coupled to the adjacent ends of adjacent lower frames 13 so that at least a portion of the lower bearing 15 is located inward of the intersection O of the extension lines of the outer surfaces of adjacent lower frames 13 along the longitudinal direction in a plan view (i.e., toward the square tube portion 11b, in other words, toward the center of the base main body 10m).

[0026] As a result, the outrigger bases 16b, which are disposed between the upper bearings 14 and the lower bearings 15, are located in the space between the upper bearings 14, which are connected to the adjacent ends of the adjacent upper frames 12 near the inside of the base frame 11 (i.e., near the square tube portions 11b, in other words, near the center of the base body 10m), and the lower bearings 15, which are connected to the adjacent ends of the adjacent lower frames 13 near the inside of the base frame 11 (i.e., near the square tube portions 11b, in other words, near the center of the base body 10m). This effectively prevents the outriggers 16 from protruding outward from the base body 10m (i.e., the frame including the base frame 11 and the upper and lower frames 12 and 13) during storage, thereby enabling the base device 10 to be made smaller and occupy less space. As a result, the base device 10 can be easily moved through narrow spaces at construction sites (for example, through holes that penetrate a floor slab from top to bottom), improving workability.

[0027] The above-mentioned surrounding frames 14k, 15k have plate-shaped surrounding frame bodies 140, 150 that surround the bearing bodies 14b, 15b with an annular gap therebetween, and upper and lower pairs of first and second support plate portions 141, 142; 151, 152 that are fixed (for example, butt-welded) to the upper and lower ends of the surrounding frame body 140, 150 so as to sandwich the surrounding frame body 140, 150 from above and below. The upper and lower pairs of first and second support plate portions 141, 142; 151, 152 are fixed (for example, welded) to the upper and lower bearings 14 or lower bearings 15 that pass through them.

[0028] In particular, the enclosing frame bodies 140, 150 of the embodiment have flat mounting surfaces 14kf, 15kf that are perpendicular to the longitudinal center lines of the upper and lower frames 12, 13 on the surfaces facing the upper and lower frames 12, 13. The end faces 12e, 13e of the upper and lower frames 12, 13 are fixed (butt-welded in the embodiment) to these mounting surfaces 14kf, 15kf. As a result, even if the bearing bodies 14b, 15b are cylindrical, the presence of the enclosing frames 14k, 15k between the outer peripheral surfaces of the bearing bodies 14b, 15b and the upper and lower frame end faces 12e, 13e makes it possible to transmit loads substantially evenly between the bearing bodies 14b, 15b and the upper and lower frames 12, 13 without bias. This reduces the load burden on each part and improves durability.

[0029] In this embodiment, one (142) of the pair of first and second support plate portions 141, 142 on the upper side and one (151) of the pair of first and second support plate portions 151, 152 on the lower side are formed integrally with a part of the corresponding vertical wall portion 11a of the base frame 11, but these may also be formed separately and fixed (for example, by welding, bolting, etc.) to the tip of the vertical wall portion 11a afterwards.

[0030] In addition, on the outer edge of each vertical wall portion 11a of the base frame 11, a concave curved portion 18 is formed that is recessed in an arc shape on the inward side (i.e., toward the square tube portion 11b) midway between the corresponding upper bearing 14 and lower bearing 15.

[0031] 4, the contact surfaces between the above-mentioned mounting surfaces 14kf, 15kf of the surrounding frame main bodies 140, 150 and the corresponding upper frame 12 or lower frame 13 are located outside an imaginary vertical plane X that passes through the central axis of the upper bearing 14 or lower bearing 15 surrounded by the surrounding frames 14k, 15k having the mounting surfaces 14kf, 15kf and is parallel to the longitudinal center line of the corresponding upper frame 12 or lower frame 13. This makes it possible to ensure a wide support span for the upper and lower bearings 14, 15 by the upper and lower frames 12, 13, thereby increasing the support rigidity for the upper and lower bearings 14, 15.

[0032] Furthermore, each outrigger 16 is set to have a maximum vertical width L1 (see FIG. 6(c)) that is smaller than the distance between the opposing surfaces of the upper and lower frames 12, 13 so that it can enter the space between the corresponding upper and lower frames 12, 13 when stowed, and a longitudinal length L2 (see FIG. 6(a)) so that the tip 16a of the outrigger 16 when stowed does not interfere with the base 16b of another adjacent outrigger 16. This makes it possible to fully utilize the space between the upper and lower frames 12, 13 as a storage space for the outriggers 16 when stowed, while avoiding mutual interference between the base 16b, including the bearing cylindrical portion 16ba, of each outrigger 16 and the tip 16a of another adjacent outrigger 16, and therefore makes it possible to more effectively prevent the outriggers 16 from protruding outward from the base main body 10m when stowed.

[0033] The outrigger body 16m, which forms the main part of each outrigger 16, is made of a metal frame with a sturdy, hollow, closed cross-section structure having a flat, rectangular cross section, and is formed into a horizontally elongated rectangle in side view. Each outrigger 16 has a bearing sleeve 16ba extending vertically integrally with its base 16b, and each bearing sleeve 16ba is disposed between the corresponding upper bearing 14 and lower bearing 15. When each outrigger 16 is set on the base body 10m, a pivot shaft 17 is inserted into the upper bearing 14, bearing sleeve 16ba, and lower bearing 15, which are aligned on the same vertical axis, so as to be able to pivot relative to each other. This allows the outrigger 16 to pivot about the pivot shaft 17 between a storage position 16B along the upper frame 12 and lower frame 13 and a deployed position 16A extending outward from the storage position 16B.

[0034] Between the pivot shaft 17 and the upper bearing 14 (or the lower bearing 15), a retaining means 19 for preventing the pivot shaft 17 from coming off is interposed so as to be detachable from the upper bearing 14 (or the lower bearing 15).

[0035] 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 extending in the extension direction of the vertical wall portion 11a in a plan view, and first and second sub-deployment positions 16A1, 16A2 extending in the extension directions of the upper and lower frames 12, 13 on one and the other sides of the upper and lower bearings 14, 15.

[0036] In this embodiment, the outriggers 16 and the base main body 10m are each provided with pin insertion holes 16h0, 16h1-16h3; 10h0, 10h1, 10h2 into which connecting pins P1, P2 that can fix the outrigger 16 to the base main body 10m can be removably inserted when the outrigger 16 is at least in the deployed position 16A (also in this embodiment when it is in the stored position 16B). The inner diameters of the pin insertion holes 16h0, 16h1-16h3; 10h0, 10h1, 10h2 are set to the same diameter, and the outer diameters of the upper and lower connecting pins P1, P2 are set to the same diameter that is slightly smaller than the inner diameters.

[0037] In this embodiment, the upper connecting pin P1 is connected to the top of each upper bearing 14 via a wire to improve workability and prevent loss, and the lower connecting 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. Note that instead of attaching the connecting pins P1 and P2 to the base main body 10m in this manner, workers may store them in appropriate locations on site and take them out and use them whenever necessary.

[0038] Next, the structure of each pin insertion hole will be specifically described with reference to Figures 4 to 6. The upper and lower walls 161, 162 of the outrigger body 16m, which has a rectangular cross section, are formed to be slightly wider than the planar shape of the upper and lower intermediate portions of the outrigger body 16m. Upper and lower extension portions 161f, 162f of these upper and lower walls 161, 162, which protrude outward from the upper and lower intermediate walls of the outrigger body 16m, respectively, are provided with three pin insertion holes 16h1 to 16h3 on the outrigger 16 side for fixing the deployed position, spaced apart in the circumferential direction, particularly on the base portion 16b side of the outrigger 16. These pin insertion holes 16h1 to 16h3 for fixing the deployed position are distributed at three locations, as can be seen in Figure 6(a), corresponding to the three deployed positions 16A of the outrigger 16 (i.e., the main deployed position 16A0 and the first and second auxiliary deployed positions 16A1, 16A2). Furthermore, an upper extension 161f of the tip 16a of the outrigger 16 is provided with a pin insertion hole 16h0 for fixing the storage position.

[0039] Furthermore, at least one of the pin insertion holes 16h0, 16h1 to 16h3 provided on the outrigger 16 side may be provided by drilling a hole in the main part of the outrigger body 16m, for example, in the wall part that forms the closed cross section of the outrigger body 16m, instead of providing it in the upper and lower extension portions 161f, 162f.

[0040] On the other hand, the base main body 10m has a pin insertion hole 16h0 on the tip 16a side of the outrigger 16 and a first pin insertion hole 10h0 on the side of the base main body 10m for cooperating with the upper connecting pin P1 to fix the outrigger 16 to the storage position 16B, and this first pin insertion hole 10h0 is arranged in a fixed bracket 12b in the middle part of the upper frame 12.

[0041] In addition, the base body 10m, particularly the upper and lower support plate portions 141, 142; 151, 152 of the surrounding frames 14k, 15k that clamp 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 to cooperate with the upper and lower pin insertion holes 16h1 to 16h3 on the base 16b side of the outrigger 16 to fix the outrigger 16 to the three deployed positions 16A0, 16A1, 16A2, respectively.

[0042] As can be seen in Figure 5(A), some of the multiple second pin insertion holes 10h1, 10h2 (particularly the pin insertion hole 10h1 provided in the upper and lower support plate portions 151, 152 of the surrounding frame 15k of the lower bearing 15) can be inserted into the lower connecting pin P2 together with one of the pin insertion holes 16h1 to 16h3 on the base 16b side of the outrigger 16 (in the illustrated example, the lower pin insertion hole 16h2), thereby fixing the outrigger 16 in the storage position 16B.

[0043] Figure 8 is a diagram that clearly explains how the insertion relationship between the upper and lower connecting pins P1 and P2 and the pin insertion holes 16h0, 16h1 to 16h3; 10h0, 10h1, and 10h2, which are to be used to fix the outrigger 16 in each operating position (i.e., the storage position 16B and the three deployed positions 16A0, 16A1, and 16A2) in this embodiment, changes.

[0044] In this Figure 8, the thick black dots indicate the connecting pins P1 and P2 selected to fix the outrigger 16 in the operating position (16B, 16A0, 16A1, 16A2), and the reference symbols of the pin insertion holes in parentheses indicate the pin insertion holes into which the selected connecting pins P1 and P2 are inserted.

[0045] In this embodiment, when the outrigger 16 is in the storage position 16B or the deployed position 16A, by inserting the connecting pins P1 and P2 into the pin insertion holes 16h1 to 16h3, 10h1 and 10h2 of the outrigger 16 and the base main body 10m, the outrigger 16 can be securely fixed to the storage position 16B or the deployed position 16A relative to the base main body 10m, thereby stabilizing support for the base device 10 and, ultimately, support for the distributor D.

[0046] Moreover, the outrigger 16 of the embodiment has an outrigger main body 16m and extending portions 161f, 162f fixed to the outrigger main body 16m and extending outward from the outer surface of the outrigger main body 16m, and the pin insertion holes 16h0, 16h1 to 16h3 on the outrigger 16 side are provided in the extending portions 161f, 162f. This not only allows the pin insertion holes 16h0, 16h1 to 16h3 to be arranged with a high degree of freedom in the outrigger 16 (particularly in the extending portions 161f, 162f) without affecting the cross-sectional shape of the outrigger main body 16m, but also prevents stress concentration portions (and therefore weak portions) from occurring in the outrigger 16 due to the special provision of the pin insertion holes 16h0, 16h1 to 16h3, ensuring sufficient strength for the outrigger 16.

[0047] In addition, 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, while the base main body 10m has a first pin insertion hole 10h0 on the base main body 10m side for cooperating with the pin insertion hole 16h0 on the tip 16a side of the outrigger 16 to fix the outrigger 16 to the storage position 16B, and two second pin insertion holes 10h1, 10h2 on the base main body 10m side for cooperating with the three pin insertion holes 16h1 to 16h3 on the base 16b side of the outrigger 16 to fix the outrigger 16 to the deployed position 16A (more specifically, the main deployed position 16A0, and the first and second secondary deployed positions 16A1, 16A2). The outrigger 16 can be fixed in the storage position 16B by inserting the lower connecting pin P2 into one of the pin insertion holes 16h1 to 16h3 (the lower pin insertion hole 16h2) on the base 16b side of the outrigger 16 into one of the second pin insertion holes 10h1, 10h2. This makes it possible to use the one 10h1 of the two second pin insertion holes 10h1, 10h2 on the base main body 10m side, the one 16h2 of the three pin insertion holes 16h1 to 16h3 on the outrigger base 16b side, and the lower connecting pin P2 to fix the outrigger 16 not only in the deployed position 16A but also in the storage position 16B, which contributes to simplifying the fixing structure and ultimately to cost reduction.

[0048] In the above embodiment, two upper and lower connecting pins P1 and P2 are inserted into two pin insertion holes 10h0 and 10h1 on the base body 10m at two locations on the tip 16a and base 16b sides of the outrigger 16 to fix the outrigger 16 in the storage position 16B, but only one connecting pin (for example, the upper connecting pin P1) may be used to fix the outrigger 16 in the storage position 16B.

[0049] In this case, for example, the upper connecting pin P1 that is inserted into one 10h1 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 stowed to fix the outrigger 16 in the stowed position 16B. As a result, even when the outrigger 16 is fixed in the stowed position 16B with only a single connecting pin P1, that connecting pin P1 can also be used to fix the outrigger 16 in the deployed position 16A, thereby simplifying the fixing structure and thereby reducing costs.

[0050] Although not shown, the outrigger 16 may be fixed in the storage position 16B and the deployed position 16A with dedicated connecting pins, respectively. In this case, for example, the storage position 16B and the deployed position 16A can be fixed with one dedicated pin each, but the hole provided in the outrigger 16 for fixing the storage 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.

[0051] Next, an example of the mast assembly 20 will be described with reference to FIGS.

[0052] The mast assembly 20 is divided into a plurality of masts M that are supported upright on the base assembly 10 and connected to one another in a tandem arrangement, and the overall length (and therefore the overall height) of the mast assembly 20 can be increased by increasing the number of connected masts M. A boom assembly 30 is mounted on the top of the mast assembly 20 (i.e., on the top of the highest mast M).

[0053] The masts M are basically identical in structure, each with a sturdy, closed, rectangular cross section. A ladder 23 is fixed to the outer periphery of each mast M, allowing workers to ascend and descend along the mast assembly 20. A work platform 24 is fixed to the top of the highest mast M, allowing workers to safely perform various tasks. These fastening operations are performed in advance, using fastening means (e.g., bolts, pins, or caulking) not shown, before the mast assembly 20 is installed on the base assembly 10. The various operations performed on the work platform 24 include, for example, the operation of connecting the mast assembly 20 and the boom assembly 30 in the "assembly process" of the distributor D (described later) and the operation of connecting various pipes, as well as maintenance operations such as inspection and servicing of various parts of the boom support BS and refueling.

[0054] Furthermore, connecting pipes 28 are fixed to the outer periphery of each mast M. The connecting pipes 28 are connectable to concrete pumping pipes extending from a concrete pump (not shown) and extend in a vertical arrangement along the mast M, and adjacent connecting pipes 28 can be connected to each other in a liquid-tight manner using appropriate joints. In this embodiment, the length of the connecting pipes 28 is set to half the length of one mast M; for example, two 2-m connecting pipes 28 are connected in series for a mast M with a total length of 4 m.

[0055] A plurality of connecting blocks 21, 21' are fixed (e.g., welded) to the outer periphery of each of the upper and lower ends of each mast M, aligned at the same circumferential position and spaced apart from one another in the circumferential direction. The connecting blocks 21, 21' fixed to the outer peripheries of adjacent ends of a pair of adjacent masts M abut against each other with the masts M arranged vertically one above the other. At least one protrusion 22t is provided on one of the abutment surfaces 22, 22' (i.e., the upward abutment surface), and at least one recess 22d is provided on the other abutment surface 22, 22' (i.e., the downward abutment surface). These protrusions 22t and recesses 22d engage with each other to correctly position the pair of adjacent masts M relative to each other and to prevent circumferential and radial misalignment of the pair of masts M along the abutment surfaces 22, 22'.

[0056] The pair of connecting blocks 21, 21' that are in contact with each other are connected by a wire that penetrates both of the connecting blocks 21, 21'. Complex The masts M are integrally connected to each other by a number of bolts 25, and this connection maintains the mutual abutment of the connecting blocks 21, 21', and therefore the mutual engagement of the convex and concave portions 22t and 22d. In this case, the fastening effect of the abutting surfaces by the bolts 25 and the interlocking effect of the concave and convex engaging portions work together (i.e., the cooperation of the connecting blocks 21, 21' and the bolts 25), making it possible to tightly and firmly connect the two masts M while reliably preventing misalignment of a pair of adjacent masts M. 。

[0057] 10(A) and 10(B), the bolts 25 of this embodiment include a first bolt 25 that penetrates the tip surface of the convex portion 22t and the bottom surface of the concave portion 22d that abuts against said tip surface, a second bolt 25 that penetrates the abutment surfaces 22, 22' of the joining blocks 21, 21' on one side of the convex portion 22t, and a third bolt 25 that penetrates the abutment surfaces 22, 22' of the joining blocks 21, 21' on the other side of the convex portion 22t. This makes it possible to more strongly fasten the abutment surfaces of the first to third bolts at the engaging portions of the convex and concave portions and their surrounding areas, thereby enhancing the interlocking effect of the engaging portions and making it possible to firmly join the pair of adjacent masts while more reliably preventing misalignment between the two masts.

[0058] It should be noted that, instead of using the first to third bolts 25 described above, it is also possible to connect the two masts M, M by using only the first bolt 25 that passes through the convex portion 22t and the concave portion 22d. It is also possible to connect the two masts M, M by using the second and third bolts 25 that pass through both sides of the convex portion 22t and the concave portion 22d.

[0059] As is clear from Figures (B) and (C), the connecting blocks 21, 21' in this embodiment are arranged so that the abutment surfaces 22, 22' protrude beyond the end faces of the masts M to which they are fixed on the outer peripheries of the ends. This leaves a slight clearance 29 between the opposing end faces of adjacent masts M. This allows the connecting blocks 21, 21' to abut accurately against each other without being affected by machining errors on the end faces of the masts M, making it possible to accurately connect adjacent masts M while reducing the machining costs of the masts M.

[0060] The clearance 29 may be omitted, and the opposing end faces of the adjacent masts M may be brought into direct contact with each other.

[0061] Thus, the concave-convex engagement of the abutment surfaces of the connecting blocks 21, 21' makes it easy to position a pair of adjacent masts M relative to each other, and the concave-convex engagement reliably prevents the pair of masts M from shifting relative to each other in the direction along the abutment surfaces, so that the work of connecting the masts M can be carried out quickly and accurately, greatly improving work efficiency.

[0062] Furthermore, a protrusion 21t is integrally formed on the back surface of each connecting block 21, 21', i.e., on the surface 26 facing the outer periphery of the mast M, which fits into a support hole 27 formed in the end of the mast M with which the connecting block 21, 21' contacts. By fitting this protrusion 21t 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 protrusion 21t and the support hole 27 is welded, and the outer periphery of the facing 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, which increases the overall welded area and effectively increases the overall connection strength between each connecting block 21, 21' and the mast M.

[0063] Furthermore, the projections 21t and the support holes 27 may be omitted from the opposing surfaces of the back surfaces of the connecting blocks 21, 21' and the outer periphery of the mast M, and in that case, the opposing surfaces, each of which is made flat, are welded together by directly bringing them into flat contact with each other.

[0064] In this embodiment, the concave-convex engagement structure of the contact surfaces of the joining blocks 21, 21' is exemplified by a structure in which the convex portions 22t and concave portions 22d provided on one and the other of the contact surfaces are formed as stepped concave-convex surfaces, but the concave-convex engagement structure is not limited to the embodiment, and for example, the convex portions and concave portions may be formed by protrusions and recesses that fit together.

[0065] In the above 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 to the outer periphery of the upper end of the square tube portion 11b, which has substantially the same cross-sectional shape as the mast M. The connecting blocks 21 of this square tube portion 11b have the same structure as the connecting blocks 21 on the upper end side of the mast M, and the structure for fixing the blocks to the square tube portion 11b is also the same as the structure for fixing the connecting blocks 21, 21' to the mast M. In other words, the method for connecting the connecting block 21 of the square tube portion 11b to the connecting block 21' fixed to the lower end of the lowest mast M is the same as the method for connecting the connecting blocks 21, 21' between adjacent masts M described above.

[0066] Next, an example of the boom device 30 will be described with reference to FIGS.

[0067] The boom device 30 comprises a boom train BT consisting of a plurality of booms B1 to B4 arranged in series with one another and pivotally connected to one another so that they can be bent and swung, and a boom support base BS attached to the top of the mast device 20 (specifically, the upper end of the highest mast M) and supporting the first boom B1, which is the basemost boom in the boom train BT, so that it can be raised and lowered via a pivot J1.

[0068] The boom support base BS comprises a fixed base 31 fixed to the upper part of the mast device 20 and a swivel base 32 rotatably supported on the fixed base 31 via a vertical swivel axis J5, and the upper part of the swivel axis J5 is connected to the swivel base 32 so that it rotates integrally with the swivel base 32.

[0069] A plurality of slewing bearings 31b are fixed within the fixed base 31, which engage and support the slewing shaft J5 so that it cannot move axially relative to the slewing shaft J5 but can rotate relative to the slewing shaft J5. An interlocking connection mechanism (not shown) is interposed between the slewing shaft J5 and a slewing actuator (not shown) within the fixed base 31, which forcibly rotates the slewing shaft J5 (and therefore the slewing base 32) about the vertical axis in conjunction with the actuator. Note that the structures of the slewing actuator and the interlocking connection mechanism are well known in the technical field of multi-stage boom crane apparatuses, so a cover body 31c connected to the fixed base 31 to cover the actuator and the interlocking connection mechanism is merely illustrated in Figures 12 and 13, and further description will be omitted.

[0070] A plurality of connecting blocks 21' of the same structure as those fixed to the lower ends of the masts M are fixed to the outer periphery of the lower end of the fixed base 31, and the connecting blocks 21' on the fixed base 31 side and the connecting blocks 21 on the upper end side of the uppermost mast M are abutted against each other and fastened together with bolts 25, thereby connecting the fixed base 31 and the uppermost mast M. In other words, the method of connecting the connecting blocks 21' on the fixed base 31 side and the connecting blocks 21 on the upper end side of the uppermost mast M is the same as the method of connecting the connecting blocks 21, 21' between adjacent masts M.

[0071] The swivel base 32 includes a swivel base main body 32m to which the upper end of the swivel shaft J5 is fixed, and a pair of left and right upright wall portions 32s integrally provided on the upper surface of the swivel base main body 32m, with the upright wall portions 32s connected by a plurality of connecting walls 32c. Meanwhile, the base of the first boom B1 is formed with a U-shaped cross section so as to sandwich the upright wall portions 32s from both the left and right sides.

[0072] A pair of left and right side wall portions 35 of the base of the first boom B1 and the adjacent upright wall portions 32s of the swivel base 32 are connected to each other via a pair of left and right short cylindrical pivot shafts J1 so that the first boom B1 is supported on the swivel base 32 so that it can rotate up and down about the pivot shafts J1. Therefore, the pivot shafts J1 form a rotation shaft support portion that pivotally supports the first boom B1 on the swivel base 32 so that it can rotate up and down.

[0073] The revolving shaft J5 is formed in a cylindrical shape extending vertically, and a 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 partway through its hollow portion. The upstream end (i.e., the lower end) of this first relay pipe 38 is liquid-tight connected via a joint to the downstream end (i.e., the upper end) of the connection pipe 28 provided along the uppermost mast M described above. Meanwhile, the portion (upper part) of the first relay pipe 38 downstream of the revolving shaft J5 passes through one of the left and right pivot shafts J1 and is drawn out to the outside of the first boom B1, and its drawn-out end, i.e., the downstream end, is liquid-tight connected to a second relay pipe 39, described below, which is arranged on the boom row BT side.

[0074] 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 swivel base 32, which will be described later) to forcibly raise and lower the first boom B1 relative to the boom support base BS. Hydraulic cylinders C2 to C4 are interposed directly or via link mechanisms between adjacent booms in the boom train BT (i.e., between the base-end first boom B1 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 tip-most fourth boom B4).

[0075] A hydraulic supply system (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) is connected to each of the hydraulic cylinders C1 to C4 via hydraulic piping (not shown) routed along the boom row BT. The supply and discharge of hydraulic pressure between this hydraulic supply system and each of the hydraulic cylinders C1 to C4 is controlled by the operator. The configuration of this hydraulic control system is also well known in the technical field of multi-boom crane apparatuses.

[0076] Additionally, a flexible blow-out tube 37 capable of blowing out ready-mixed concrete from its tip is attached to the tip of the fourth boom B4. The base end of this blow-out tube 37 and the downstream end of the aforementioned connecting pipe 28 installed along the mast M are connected via the first relay pipe 38 installed on the boom support base BS and a second relay pipe 39 supported by each of the booms B1 to B4 of the boom row BT and arranged along each of the booms B1 to B4.

[0077] The second relay pipe 39 is bent with a folded portion in the middle that passes through the hollow pivot axis J2 to J4, which serves as the pivotal connection portion between adjacent booms B1, B2; B2, B3; B3, B4, and is routed along the adjacent booms B1 to B4.

[0078] Moreover, 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 connects them to be rotatable relative to each other about the axis of the pivot J1. Also, joints that connect the upstream pipe section and the downstream pipe section to be rotatable relative to each other are provided midway along the second relay pipe 39, particularly near each of the turning portions. Therefore, these joints enable the second relay pipe 39 to smoothly follow the hoisting rotation and bending swing of the first boom B1 and the bending and swing of adjacent booms B1, B2; B2, B3; B3, B4 relative to each other.

[0079] Meanwhile, a plurality of first attachment parts T1 connectable to the first cords W1 are installed on the fixed base 31 and are used when the boom train BT is folded and in a horizontal position (see FIG. 15) or a vertical position (see FIG. 17) to lift the boom device 30 via the first cords W1 with a crane. In this embodiment, the first cords W1 connected to each first attachment part T1 are composed of a single wire 51 (see FIG. 15) each having eye-shaped connectable parts 51a at both ends. Note that, because cranes for lifting the boom device 30 are well known, the crane itself is not shown in the embodiment, and only a crane hook 80 suspended via a wire from the boom tip of the crane itself is shown.

[0080] In particular, in this embodiment, two pairs of first mounting portions T1 arranged at intervals in a predetermined direction (hereinafter simply referred to as the width direction of the boom row BT) along the axis of the pivot J1 of the base of the first boom B1 are disposed on the fixed base 31 at intervals in a horizontal direction perpendicular to the width direction (i.e., at four locations in total, on the front, back, left and right sides of the fixed base 31). It is also possible to provide three or more pairs of first mounting portions T1.

[0081] Therefore, when the boom row BT is in a vertical position and the boom device 30 is lifted by a crane via the first ropes W1, if the boom support base BS is lifted by the same number of first ropes W1 via first mounting parts T1 distributed at least at three locations spaced apart from each other, the boom device 30 can be lifted in as stable a vertical position as possible.

[0082] Each first mounting portion T1 includes a support wall 41w with support holes 42 formed in four support brackets 41 each fixed to the fixed base 31, and a connector 40 detachably connected to the support wall 41w, and the connector 40 includes 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 hole 42 of the support wall 41w so as to be relatively rotatable. A knob 44a that also serves as a stopper and engages with one of the arms 43a is integrally formed on one end of the mounting shaft 44, and a stopper member 45 (for example, a split pin) that engages with the other arm 43a is detachably engaged with the other end of the mounting shaft 44.

[0083] To attach the eye-shaped connectable portion 51a of the first cable W1 to the first attachment portion T1, for example, the split pin 45 is removed and the attachment shaft 44 is pulled out from the support wall 41w to remove the connecting hook 43 from the support bracket 41, and then the connecting hook 43 is connected to (inserted through) the connectable portion 51a of the first cable W1, and then the connecting hook 43 is reattached to the support bracket 41 via the attachment shaft 44 in the reverse order of the previous procedure. In this case, the attachment shaft 44 functions as a locking member that closes the gap between the 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 attachment portion T1) and the connectable portion 51a at the end of the first cable W1.

[0084] The structure of the connector 40 that connects the connected portion 51a of the first rope W1 to the first mounting portion T1 is not limited to the embodiment, and may be any connecting structure that is attached to at least the fixed base 31 (support bracket 41) and can be attached and detached as needed to the connected portion 51a of the first rope W1. For example, as a variation of the connector 40 (not shown), a hook-shaped connecting hook whose hook opening is always open, or a hook with a stopper piece that pivotally supports a stopper piece on the hook body to prevent disengagement and that can open and close the hook opening, and that is always resiliently biased to a position that closes the hook opening, may be used as the connector.

[0085] Incidentally, the first mounting part T1 described above is provided on the boom support base BS, particularly on the fixed base 31, via the support bracket 41, but it may also be provided directly on the fixed base 31. Also, instead of providing the first mounting part T1 on the fixed base 31, it may be provided on the swivel base 32 directly or via a support member such as a bracket.

[0086] Further, a second attachment part T2 is provided midway along the first boom B1. The second attachment part T2 is used when lifting the boom device 30 with a crane via the second cords W2 while the boom row BT is in a horizontal position, and is connectable to the second cords W2. The second cords W2 connected to the second attachment part T2 are formed of a single wire 52 (see FIG. 15) having eye-shaped connectable parts 52a at both ends, similar to the first cords W1.

[0087] The installation location of the second mounting portion T2 is set at a location such that when the boom device 30 is lifted by a crane via the first and second ropes W1 and W2 with the boom row BT in a horizontal position, the center of gravity of the entire boom device 30 (see reference symbol G in Figure 15) is midway between the first and second mounting portions T1 and T2 in the longitudinal direction of the boom row BT.

[0088] The second mounting portion T2 also includes, for example, a connecting arm 46 that straddles the middle portion of the first boom B1 from above, and a connecting device 40 that is detachably connected to an upper support wall 46w of the connecting arm 46, and a pair of bifurcated legs 46a of the connecting arm 46 are rotatably supported by pivots 46p on the left and right side walls of the first boom B1, respectively. The connecting device 40 has the same structure as the connecting device 40 of the first mounting portion T1 described above, and more specifically, 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.

[0089] Then, in a state in which the mounting shaft 44 is removed and the connecting hook 43 is separated from the upper support wall 46w, the connecting hook 43 is engaged with the eye-shaped connectable portion 51a of the second cord W2 and then reattached to the upper support wall 46w via the mounting shaft 44, thereby enabling the second cord W2 to 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, like the first mounting part T1, the connector 40 of the second mounting part T2 is not limited to the embodiment, and for example, variations (not shown) described for the first mounting part T1 can also be employed.

[0090] 15, when the boom assembly 30 is hoisted by a crane via the first and second cables W1, W2 with the boom train BT in a horizontal position, in this embodiment, the position of the first attachment part T1 relative to the boom support base BS is set so that the first cable W1 passes closer to the tip of the first boom B1 than the axis of the pivot support part (pivot J1) of the boom support base BS that rotates relative to the first boom B1 in a side view. In this case, in the example shown in FIG. 15, the first cable W1 is connected to the first attachment part T1 on the tip side of the first boom B1 (the right side in FIG. 15), but it may also be connected to the first attachment part T1 on the opposite side (the left side in FIG. 15).

[0091] The above-mentioned setting of the arrangement position of the first mounting portion T1 is determined from the viewpoint of effectively preventing the boom row BT from opening and swinging relative to the boom support base BS when the boom device 30 is lifted in the above-mentioned horizontal position, as will be described later. However, if such an inhibiting effect is not important, the arrangement position of the first mounting portion T1 relative to the boom support base BS may be set so that the first cable W1 passes outside the above-mentioned pivot support portion (pivot J1) in a side view, i.e., on the left side in Figure 15.

[0092] Furthermore, a third mounting portion T3 is provided at the base of the first boom B1 for cooperating with the second mounting portion T2 to hold the second cable W2 to the first boom B1 when not in use. The third mounting portion T3 includes, 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. The connector 40 of the third mounting portion T3 is also not limited to the embodiment described above, and variations (not shown) described for the first mounting portion T1 can also be used.

[0093] Furthermore, the third mounting portion T3 can be omitted. In that case, the second cable W2, which is not required during concrete pouring work, can be removed from the second mounting portion T2 (first boom B1), and the second cable W2 can be attached to the second mounting portion T2 when assembling and dismantling the distributor D.

[0094] Next, an example of a boom device lifting auxiliary device that can be used when using the concrete supply distributor D of this embodiment to lift the boom device 30 with a crane via multiple first ropes W1 when the boom row BT is in a vertical position will be described with reference to Figures 17 and 18.

[0095] That is, as shown in FIG. 17, the auxiliary device includes a hoisting rod 50 whose both ends are detachably connected to at least one pair of first cables W1 when connecting first cables W1 to all of the first mounting portions T1 and lifting the boom apparatus 30 in the vertical position via the first cables W1 with a crane. The hoisting rod 50 is configured as a rigid rod-shaped body that is formed longer than the maximum width of the boom row BT in a predetermined direction. The connection position of the hoisting rod 50 to the first cables W1 is set so that the hoisting rod 50 can straddle the boom apparatus 30 near the top end of the boom apparatus 30 in the vertical position. A pair of triangular support plates 55 are fixed (e.g., welded) to both ends of the hoisting rod 50, and a pair of support holes 56 are formed in the support plates 55 at intervals.

[0096] The first cable W1 is divided into a first cable portion W1u above the suspension rod 50 and a second cable portion W1d below. The connected portions 51a of the first and second cable portions W1u, W1d are each 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 each have 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 by a pair of support holes 56 of the support plate 55 via mounting shafts 44. Therefore, the attachment and detachment operations of the connector 40 used for this suspension rod 50 are the same as those of the connector 40 of the first mounting portion T1.

[0097] The structure of the connector 40 used for the suspension rod 50 is also not limited to the embodiment, and for example, variations (not shown) described for the first attachment portion T1 can be adopted.

[0098] Furthermore, when the boom device 30 is lifted by a crane via a plurality of first ropes W1 with the boom train BT in a vertical position as described above, the auxiliary device is provided with an annular support 60 that is detachably connected to the middle of at least two first ropes W1 (in the illustrated example, at a position near the upper end of the boom device 30) between the lifting rod 50 and the first mounting portion T1 in the vertical direction, and that surrounds all of the first ropes W1 and the boom train BT.

[0099] This annular support 60 is intended to prevent the boom train BT from tilting more than a predetermined angle with the first attachment part T1 as the tilting fulcrum when the boom device 30 is lifted via the plurality of first ropes W1 with the boom train BT in a vertical position. The annular support 60 is composed of a flexible and sturdy annular body (for example, an endless wire rope, chain, etc.), and is detachably connected to the middle of the annular support 60 via connectors 40 with connecting members 61 fixed (for example, by crimping, welding, bolting, etc.) to the middle of at least two first ropes W1 (at portions closer to the suspension rods 50).

[0100] The connector 40 used to connect the annular supports 60 has the same structure as the connector 40 of the first attachment part T1 described above, that is, a U-shaped connecting hook 43 is rotatably supported in a support hole 62 of the connecting member 61 via an attachment shaft 44. Therefore, the attachment and detachment operations of the connector 40 used to connect the annular supports 60 are also similar to those of the connector 40 of the first attachment part T1. The structure of the connector 40 used for the annular supports 60 is also not limited to the embodiment, and for example, variations (not shown) described for the first attachment part T1 can be adopted.

[0101] A grease pump Gi serving as a grease injector, a distributor Vd connected to the grease pump Gi via a single grease base pipe GL0, and multiple grease pipes (first through fourth grease pipes GL1 through GL4) connected in parallel to the grease base pipe GL0 (and thus the grease pump Gi) via the distributor Vd are fixed and supported on the fixed base 31 of the boom support BS. The grease pump Gi includes, for example, a grease holding section 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 section to the grease base pipe GL0, and its structure is well known. The distributor Vd distributes the grease that flows into it to the first through fourth grease pipes GL1 through GL4 in equal volumes, and its structure is also well known.

[0102] The first to fourth grease pipes GL1 to GL4 are mostly flexible, and their midsections are bundled together and extend upward outside the fixed base 31, then pass through the swivel base 32 and the base of the first boom B1. Of the first to fourth grease pipes GL1 to GL4 that extend from inside 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 that serves as a rotational support for the first boom B1, and is able to supply grease to parts to be lubricated around the pivot J1 (for example, the fitting portion between the outer periphery of the pivot J1 and a bearing, and the fitting portion between the inner periphery of the pivot J1 and the second relay pipe 39).

[0103] The second to fourth grease pipes GL2 to GL4 that protrude 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, among the second to fourth grease pipes GL2 to GL4, extends to the vicinity of the pivot J2 that pivotally connects the first and second booms B1 and B2, and can supply grease to parts to be lubricated around the pivot J2 (for example, the fitting portion between the outer periphery of the pivot J2 and the bearing, and the fitting portion between the inner periphery of the pivot J2 and the second relay pipe 39). Meanwhile, 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.

[0104] At the tip of the second boom B2, the third and fourth grease pipes GL3, GL4, in particular the third grease pipe GL3, extend to the vicinity of the pivot J3 which is the pivotal connection part of the second and third booms B2, B3, and can supply grease to parts to be lubricated around the pivot J3 (for example, the fitting part between the outer periphery of the pivot J3 and the bearing, and the fitting part between the inner periphery 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.

[0105] 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 pivotal connection part of the third and fourth booms B3 and B4, and is capable of supplying grease to the lubricated parts around the pivot J4 (for example, the fitting part between the outer periphery of the pivot J4 and the bearing, and the fitting part between the inner periphery of the pivot J4 and the second relay pipe 39).

[0106] Thus, the first to fourth GL1 to GL4 extend to the respective lubricated parts of the plurality of booms B1 to B4 of the boom train BT, and supply grease to these lubricated parts.

[0107] As is clear from Figures 12 and 21, the first to fourth backup pipes GE1 to GE4 branch off from the first to fourth grease pipes GL1 to GL4. These backup pipes GE1 to GE4 have grease inlets GEi1 to GEi4, which function as backup grease inlets that can individually inject grease into the corresponding backup pipes GE1 to GE4. Each grease inlet GEi1 to GEi4 is fitted with a manual plug that normally closes it, and each plug can open and close the grease inlet GEi1 to GEi4 as needed. Additionally, check valves Vc are provided on the first to fourth grease pipes GL1 to GL4 between the branching points of the backup pipes GE1 to GE4 and the distributing valve Vd to prevent grease from flowing back from the grease pipes GL1 to GL4 to the distributing valve Vd.

[0108] 21, a backup pipe GE0 for grease supply may be branched off from the grease base pipe GL0 (between the check valve Vc and the distributing valve Vd), and a manually openable plug that is normally closed is attached to the backup pipe GE0. By using this backup pipe GE0, it becomes possible to supply grease to the grease base pipe GL0 even in the event of a malfunction of the grease pump Gi.

[0109] In the grease supply system described above, the backup system (backup pipes GE0, GE1 to GE4 and check valve Vc) may be omitted.

[0110] Thus, with the grease supply structure of this embodiment, grease can be simultaneously supplied to the multiple grease pipes GL1-GL4 from a single common grease pump Gi via a distribution valve Vd. This allows grease to be quickly and easily supplied to the lubricated parts of the multiple booms B1-B4 in the boom train BT even when the boom train BT remains attached to the boom support base BS (i.e., without lowering the booms B1-B4), thereby reducing the time and labor required for grease supply. Furthermore, since grease supply is thus simplified, situations where the booms are left unsupplied without being greased are effectively avoided, which is also effective in preventing breakdowns and reduced durability of the boom device 30.

[0111] Furthermore, check valves Vc are provided in the grease pipes GL1 to GL4 between the branch points where the backup pipes GE1 to GE4 branch off and the distribution valve Vd to prevent grease from flowing back toward the distribution valve Vd. This makes it possible to reliably prevent the supplied grease from flowing back toward the distribution valve Vd and preventing it from reaching the lubricated parts of the booms B1 to B4 when grease is replenished from the backup pipes GE1 to GE4 due to a malfunction of the distribution valve Vd or the like.

[0112] Next, the operation of the embodiment will be described with reference to FIGS.

[0113] When the distributor D of this embodiment is used at a building construction site, for example, a reinforced concrete floor slab FS1 of the lowest floor (for example, the first floor) is constructed in advance, and the floor slab FS1 has through holes H that connect the spaces above and below it. Then, an assembly process is carried out in which the distributor D is assembled and installed on the floor slab FS1, and a process is carried out in which the upper floor slab and associated walls are constructed based on the pouring of ready-mixed concrete using the installed distributor D.

[0114] Once the upper floor slabs FS2, FS3, etc. have been constructed in this way, a process is carried out in which the entire distributor D is remounted on the upper floor slab (this process is called "reloading" on site) in order to construct the upper floor slabs, etc. The above-mentioned distributor D assembly process and reloading process will now be described 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 outrigger 16 in the deployed position 16A is placed on the floor slab FS1 and fixed with conventional fixing means (for example, an anchor bolt that passes through the outrigger 16).

[0115] Next, as illustrated in Figure 14(B), the mast device 20, which has been assembled in advance at another location, including the ladder 23, connecting pipes 28, and work platform 24 together with one or more masts M, is suspended by a crane and placed on the base device 10 (on the square tube portion 11b of the base frame 11), and connected to the base device 10 via connecting blocks 21, 21' and bolts 25.

[0116] Next, as shown in Figure 14(C), the boom device 30, which has been pre-assembled as an assembly of the boom train BT and boom support base BS at a different location, is folded up and placed in a substantially horizontal, sideways position, and the connected portions 51a at the lower ends of the first and second cords W1, W2 are respectively connected to the fixed base 31 and the first and second mounting portions T1, T2 on the first boom B1. The upper portions of the first and second cords W1, W2 are then 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 the connecting blocks 21, 21' and bolts 25. This connecting operation is performed by a worker on the work platform 24 in cooperation with the crane operator.

[0117] Thereafter, the first cable W1 is removed from the crane hook 80 and the first mounting part T1 and stored in another storage location. The upper end of the second cable W2 is removed from the crane and attached to the third mounting part T3, while the lower end is left connected to the second mounting part T2.

[0118] 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. Meanwhile, the upstream end (lower end) of the connecting pipe 28 is liquid-tightly connected via a joint to a concrete pressure pipe extending from an external concrete pump (not shown). This makes it possible to pressure-feed and supply ready-mixed concrete from the concrete pump to the connecting pipe 28, first and second relay pipes 38 and 39, and blow-out tube 37 in that order.

[0119] Thus, installation of the distributor D on the floor slab FS1 of the lowest level is completed, and from this state the distributor D can supply ready-mixed concrete to the desired casting location from the blow-out tube 37 at the end of the boom train BT by appropriately bending the booms B1 to B4 of the boom train BT relative to each other and rotating the swivel 32 (and therefore the boom train BT). This makes it possible to sequentially build the floor slab FS2 and wall of the next level, and then the floor slab FS3 and wall of the level after that.

[0120] Once the upper floor slabs FS2, FS3 and wall bodies have been built in this way, the next re-laying process is carried out in which the entire distributor D is re-placed, for example, on the floor slab FS2 in order to build the upper floor slab FS4 etc. [Refilling process] In this step, for example, the connection 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 fixation to the floor slab FS1. Then, as shown in Figure 16(E), the folded boom row BT is raised and swung up until it assumes a substantially vertical position, and in this state, the connected portions 51a at the lower ends of the four first cords W1 are respectively connected to the four first mounting portions T1 of the boom support base BS (fixed base 31). Then, the connected portions 51a at the upper ends of the first cords W1 are engaged with the crane hook 80, and the entire distributor D is lifted up by a crane.

[0121] 16(F), the outriggers 16 are rotated to the storage position 16B so that the outriggers 16 do not interfere with the periphery of the through-hole H in the floor slab FS2 of the upper floor 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 floor slab FS2 of the upper floor.

[0122] After the lift, as shown in Figure 16(G), the outriggers 16 are again extended to the extended position 16A and then placed on and secured to the floor slab FS2 of the upper floor. Next, the lower ends of all of the first cables W1 are removed from the first mounting portions T1 of the fixed base 31 and stored in a separate storage location. The upper end of the extension pipe 28' extending downward is connected and secured 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 via a fastening means 81 on a beam or the like around the through-hole H in the floor slab below (for example, floor slab FS2). Then, by connecting the lower end of the extension pipe 28' to a concrete pressure pipe connected to the concrete pump, ready-mixed concrete can be pressure-fed and supplied sequentially to the connecting pipe 28, the first and second relay pipes 38 and 39, and the blow-out tube 37.

[0123] Thus, the distributor D's transfer work to the upper floor is completed, and from this state the distributor D lays down the first boom B1 of the boom train BT, bends the booms B1 to B4 relative to each other as appropriate, and rotates the swivel 32 (and therefore the boom train BT), thereby enabling ready-mixed concrete to be supplied from the blow-out tube 37 at the end of the boom train BT to the desired casting location on the upper floor. This makes it possible to construct the floor slab FS4 and walls of the upper floor.

[0124] Therefore, by carrying out the above-described re-laying process sequentially as the floor slab FS increases in level, it becomes possible to construct medium-rise and high-rise buildings without difficulty using the same distributor D.

[0125] According to the present embodiment described above, the first mounting portion T1, which is used when lifting the boom device 30 via the first cords W1 with a crane while the folded boom train BT is in a horizontal or vertical position and can be connected to the first cords W1, is provided on the boom support base BS (fixed base 31 in the illustrated example), so that the boom device 30 can be lifted via the first cords W1 with a crane in an assembled state in which the boom train BT and the boom support base BS are assembled together. This eliminates the need to assemble the boom device 30 on a high mast assembly 20 as in the conventional case, and thus improves the ease of assembly of the boom device 30.

[0126] Furthermore, particularly during so-called rearrangement work in which the boom device 30 is lifted with the boom train BT in a vertical position, the entire boom device 30 is lifted, particularly at the boom support base BS, via the multiple first mounting portions T1 and multiple first ropes W1 of the boom support base BS, so 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 this lifting can be effectively reduced compared to when lifting using the boom train BT as in the past. This simplifies the structure of the connection and ultimately reduces costs.

[0127] Furthermore, the boom support base BS of this embodiment includes a fixed base 31 fixed to the upper part of the mast assembly 20, and a swivel base 32 rotatably supported about a swivel axis J5 on the fixed base 31, which pivotally supports the base of the first boom B1 so that it can be raised and lowered, and the first mounting part T1 is provided on the fixed base 31. As a result, the fixed base 31 of the boom support base BS in particular is lifted by the first ropes W1, and therefore the load on the swivel mechanism (i.e., the swivel axis J5, swivel bearing 31b, etc.) that rotatably supports the fixed base 31 on the swivel base 32 is reduced compared to when the swivel base 32 is lifted by the first ropes W1, thereby simplifying the structure of the swivel mechanism and thereby reducing costs.

[0128] Furthermore, in this embodiment, a second mounting portion T2 that is connectable to the second rope W2 and that is used when lifting the boom device 30 with a crane via the second rope W2 when the boom train BT is in a particularly horizontal position is provided midway on the first boom B1. This makes it possible to lift the boom device 30 with a crane via the first and second ropes W1, W2 (thus with a long support span in the horizontal direction) when the boom train BT is in a horizontal position, thereby ensuring stable lifting support and improving workability.

[0129] Furthermore, in the embodiment, when the boom device 30 is lifted by a crane via the first and second cables W1, W2 with the boom train BT in a horizontal position, the position of the first attachment part T1 relative to the boom support base BS is set so that, in a side view, the first cable W1 passes closer to the tip of the first boom B1 than the axis of the rotational shaft support part (i.e., pivot J1) of the boom support base BS relative to the first boom B1. As a result, during the process of lifting the boom device 30 with the boom train BT in a horizontal position, the lifting load applied to the boom support base BS by the first cable W1 via the first attachment part T1 acts on the boom support base BS, which effectively prevents the boom train BT from opening and swinging relative to the boom support base BS, thereby improving work safety with a simple opening prevention structure that utilizes the lifting load.

[0130] Additionally, a third attachment portion T3 is provided at the base of the first boom B1 for cooperating with the second attachment portion T2 to hold the second cable W2 to the first boom B1 when not in use. As a result, even if one end of the second cable W2 remains connected to the second attachment portion T2 when not in use, the other end of the second cable W2 can be connected and held to the third attachment portion T3, thereby preventing the second cable W2 from interfering with the concrete pouring work and holding the second cable W2 to the first boom. Moreover, the next time the second cable W2 is used, the time required to connect one end of the second cable W2 to the second attachment portion T2 is eliminated, thereby improving work efficiency.

[0131] Furthermore, particularly for the purpose of carrying out the rearrangement work, when connecting the first cords W1 to all of the first mounting portions T1 while the boom train BT is in the vertical position and lifting the boom device 30 in the vertical position via these first cords W1 with a crane, it is desirable to connect both ends of a suspension rod 50 that is longer in the width direction than the maximum width of the boom train BT to the middle of a pair of first cords W1 that are aligned in the width direction of the boom train BT (particularly above the upper end of the boom train BT). In this case, the pair of first cords W1 with both ends of the suspension rod 50 connected in the middle are subjected to the tensioning action of the suspension rod 50 interposed between the first cords W1, thereby reliably preventing both first cords W1 from excessively interfering with the boom train BT.

[0132] Furthermore, when the boom device 30 in the vertical position is lifted by a crane via the first cords W1 for the above-mentioned rearrangement work, it is desirable to connect an annular support body 60 surrounding all of the first cords W1 and the boom train BT to the middle of at least one first cord W1 (particularly the portion close 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 body 60 can prevent the boom train BT from tilting excessively (i.e., more than a predetermined angle) with the first mounting part T1 as the tilting fulcrum, so that it is possible to effectively prevent the boom train BT from tilting too much and tipping over when the boom device 30 is lifted.

[0133] When the boom device 30 in the vertical position described above is hoisted by a crane, it is possible to omit the use of both the hoisting rods 50 and the annular support 60. It is also possible to use only the hoisting rods 50 without using the annular support 60. It is also possible to use only the annular support 60 without using the hoisting rods 50. In this case, it is possible to hoist the boom device 30 in the vertical position with only one first rope W1 via one first mounting portion T1 on the boom support base BS side, and at that time, it is possible to prevent the boom device 30 from tipping over with the annular support 60 connected to the first rope W1.

[0134] Furthermore, in carrying out the above-mentioned [Re-laying Process], in the embodiment, the boom device 30 in the vertical position is lifted by a crane via the first rope W1 as shown in Figure 16. However, even if the boom device 30 is lifted in the horizontal position via the first and second ropes W1 and W2, the re-laying work may be carried out with the boom device 30 in the horizontal position, as long as the boom device 30 does not interfere with the constructed structure (for example, the floor slab of the upper layer).

[0135] Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various embodiments can be implemented within the scope of the present invention.

[0136] For example, in the embodiment, the mast assembly 20 is formed of two masts M arranged in a vertical line and connected to each other, and the boom assembly 30 is replaced together with the mast assembly 20 and the base assembly 10. However, depending on the length of the mast M and the type of work at the site, the mast assembly 20 may be formed of a single mast M, or the mast assembly 20 may be formed by connecting three or more masts M in a vertical line.

[0137] In the above embodiment, the connecting blocks 21, 21' fixed to the outer peripheries of the adjacent ends of the adjacent masts M at intervals in the circumferential direction are arranged adjacent to each other in the vertical direction, facing and abutting each other in the vertical direction, and the abutting surfaces are connected to each other by bolts 25. However, other connecting means (for example, welding, caulking, pinning, etc.) than bolts can also be used as the connecting means. Furthermore, the connecting blocks 21, 21' may be arranged adjacent to each other in the circumferential direction of the masts M, facing and abutting each other in the circumferential direction, and the abutting surfaces may be connected to each other by bolts 25 or other connecting means. Rubo As bolts or fixing pins, transverse (i.e. circumferentially oriented) bolts or fixing pins are used.

[0138] In addition, in the embodiment, the deployed position 16A of the outrigger 16 in the base device 10 can be set to any of three deployed positions 16A0, 16A1, and 16A2, but the deployed position 16A of the outrigger 16 may be set to one pattern, or two patterns, or four or more patterns. Note that if the deployed position 16A is set to one or two patterns, which is fewer than the three patterns in the 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 the embodiment.

[0139] In addition, in the above embodiment, the outrigger 16 is manually rotated between the storage position 16B and the deployed position 16A, but the outrigger 16 may also be rotated automatically by an actuator (not shown) provided between the outrigger 16 and the base main body 10m.

[0140] In addition, in the above embodiment, the boom train BT in the boom device 30 is shown as being composed of first to fourth booms B1 to B4 arranged in series and capable of bending and swinging relative to each other, but the boom train BT only needs to connect at least two booms and is not limited to the number of booms in the embodiment.

[0141] In addition, in the above embodiment, no length adjustment aids such as conventionally known chain blocks are used for the first and second ropes W1 and W2, but 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.

[0142] In addition, in the above embodiment, the upper and lower frames 12, 13 are connected to the base frame 11 via the surrounding frames 14k, 15k of the upper and lower bearings 14, 15, but the upper and lower frames 12, 13 may be connected directly to the base frame 11, or may be connected via other members that are separate and independent from the surrounding frames 14k, 15k.

[0143] In addition, in the above embodiment, the upper and lower bearings 14, 15 are composed of bearing bodies 14b, 15b and surrounding frames 14k, 15k connected thereto, and the bearing bodies 14b, 15b are connected to the upper and lower frames 12, 13 via the surrounding frames 14k, 15k, but the surrounding frames 14k, 15k may be omitted and the upper and lower frames 12, 13 may be connected directly (i.e., without the surrounding frames 14k, 15k) to mounting surfaces provided on the outer sides of the bearing bodies 14b, 15b.

[0144] In addition, in the above embodiment, in the [assembly process] of the distributor D, after the base device 10 and the mast device 20 are installed on site as shown in Figures 14(A) to (D), the boom row BT (first boom B1 in this embodiment) of the boom device 30 with the boom row BT in a horizontal position and the boom swivel base BS (fixed base 31 in this embodiment) are suspended by a crane via the first and second ropes W1, W2 and the first and second mounting parts T1, T2, and the fixed base 31 and the uppermost mast M are connected in this suspended state. In contrast to this, in the [assembly process] of the distributor D, as shown in the flow from Figure 14(A)(B) to Figure 19(C')(D'), after the base device 10 and mast device 20 are installed on site, the fixed base 31 of the boom device 30 with the boom row BT in the vertical position can be suspended by a crane via the four first ropes W1 and the first mounting part T1, and the fixed base 31 can be connected to the uppermost mast M in this suspended state.

[0145] 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 floor (for example, the basement or first floor) of the site, and then the mast device 20 is constructed and the boom device 30 is assembled above it. However, before the "assembly process" of the distributor D (i.e., without using the distributor D), a lower floor slightly above the lowest floor (for example, the floor slab FS2 or FS3 in the embodiment) may also be constructed, and then the base device 10 may first be installed on the upper floor slab FS2 or FS3 to start the "assembly process."

[0146] Furthermore, in the base body 10m of the base device 10 of the above embodiment, as shown simply in Figures 20(A) and (B), the upper bearings 14 are connected to the adjacent ends of adjacent upper frames 12 so that at least a portion of the upper bearings 14 is located inward of the intersection O of the extension lines of the outer surfaces of adjacent upper frames 12 along the longitudinal direction in a planar view, and the lower bearings 15 are connected to the adjacent ends of adjacent lower frames 13 so that at least a portion of the lower bearings 15 is located inward of the intersection O of the extension lines of the outer surfaces of adjacent lower frames 13 along the longitudinal direction in a planar view. In contrast to this, as another embodiment of the present invention, as simply shown in Figures 20(C) and (D), a structure may be used in which the upper bearings 14 are each connected to the adjacent ends of adjacent upper frames 12 so that at least a portion of the upper bearings 14 is located inward of the intersection O' between the outer surfaces of adjacent upper frames 12 along the longitudinal direction in a planar view (i.e., toward the square tube portion 11b, in other words, toward the center of the base main body 10m), and the lower bearings 15 are each connected to the adjacent ends of adjacent lower frames 13 so that at least a portion of the lower bearings 15 is located inward of the intersection O' between the outer surfaces of adjacent lower frames 13 along the longitudinal direction in a planar view (i.e., toward the square tube portion 11b, in other words, toward the center of the base main body 10m).

[0147] In this alternative embodiment, for example, adjacent ends of adjacent upper frames 12 are directly fixed to each other (for example, by welding, bolting, etc.), and the upper parts of the upper bearings 14 are fixed to the lower surfaces of the adjacent ends of the upper frames 12 (for example, by welding, bolting, etc.). Also, adjacent ends of adjacent lower frames 13 are directly fixed to each other (for example, by welding, bolting, etc.), and the upper parts of the lower bearings 15 are fixed to the upper surfaces of the adjacent ends of the lower frames 13 (for example, by welding, bolting, etc.).

[0148] The base device 10 of this other embodiment can also achieve basically the same effects as the base device 10 of the above-described embodiment. [Explanation of symbols]

[0149] D······Distributor M······Mast 10. Base device 21, 21′... Joining block 22, 22'....Abutment surfaces of connecting blocks 22d, 22t: Concave and convex parts twenty five···· ·Bo Ruto 26. The surface of the connecting block facing the mast 21t...Protrusion 27... Support hole 29. Clearance 30. Boom device

Claims

1. A concrete supply distributor includes a base device (10), a mast device (20) having a plurality of masts (M) supported in an upright position on the base device (10) and connected to each other in a tandem, and a boom device (30) mounted on the highest mast (M), A plurality of connecting blocks (21, 21') are fixed to the outer periphery of at least one axial end of each mast (M), and are arranged at intervals in the circumferential direction. The connecting blocks (21, 21') fixed to the outer peripheries of the adjacent ends of a pair of adjacent masts (M) abut against each other, and the convex portions (22t) and concave portions (22d) provided on one and the other of the abutment surfaces (22, 22') respectively engage with each other to position the pair of adjacent masts (M) relative to each other and to suppress positional deviation of the pair of masts (M) relative to each other in the direction along the corresponding abutment surfaces (22, 22'), The pair of connecting blocks (21, 21') that abut against each other are connected to each other by a bolt (25) that passes through both the connecting blocks (21, 21'), and this connection maintains the engagement between the convex portions (22t) and concave portions (22d) of both the connecting blocks (21, 21'). The bolts (25) include at least a first bolt (25) that penetrates the tip surface of the convex portion (22t) and the bottom surface of the concave portion (22d) that abuts the tip surface, a second bolt (25) that penetrates the abutment surfaces (22, 22') of the two connecting blocks (21, 21') on one side of the convex portion (22t), and a third bolt (25) that penetrates the abutment surfaces (22, 22') of the two connecting blocks (21, 21') on the other side of the convex portion (22t).

2. A concrete supply distributor includes a base device (10), a mast device (20) having a plurality of masts (M) supported in an upright position on the base device (10) and connected to each other in a tandem, and a boom device (30) mounted on the highest mast (M), A plurality of connecting blocks (21, 21') are fixed to the outer periphery of at least one axial end of each mast (M), and are arranged at intervals in the circumferential direction. The connecting blocks (21, 21') fixed to the outer peripheries of the adjacent ends of a pair of adjacent masts (M) abut against each other, and the convex portions (22t) and concave portions (22d) provided on one and the other of the abutment surfaces (22, 22') respectively engage with each other to position the pair of adjacent masts (M) relative to each other and to suppress positional deviation of the pair of masts (M) relative to each other in the direction along the corresponding abutment surfaces (22, 22'), A concrete supply distributor characterized in that the surface (26) of each connecting block (21, 21') facing the mast (M) is provided with a protrusion (21t) that fits into a support hole (27) provided at the end of the mast (M) with which the connecting block (21, 21') contacts.

3. A concrete supply distributor includes a base device (10), a mast device (20) having a plurality of masts (M) supported in an upright position on the base device (10) and connected to each other in a tandem, and a boom device (30) mounted on the highest mast (M), A plurality of connecting blocks (21, 21') are fixed to the outer periphery of at least one axial end of each mast (M), and are arranged at intervals in the circumferential direction. The connecting blocks (21, 21') fixed to the outer peripheries of the adjacent ends of a pair of adjacent masts (M) abut against each other, and the convex portions (22t) and concave portions (22d) provided on one and the other of the abutment surfaces (22, 22') respectively engage with each other to position the pair of adjacent masts (M) relative to each other and to suppress positional deviation of the pair of masts (M) relative to each other in the direction along the corresponding abutment surfaces (22, 22'), The connecting blocks (21, 21') are arranged so that the abutment surfaces (22, 22') protrude from the end surfaces of the masts (M) to which the connecting blocks (21, 21') are fixed on the outer peripheries of the ends thereof, A concrete supply distributor characterized in that a clearance (29) exists between the opposing end faces of adjacent masts (M).

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