Base frame of the crane

Abstract

To provide a foundation frame of a crane capable of being transported and being easily assembled or disassembled.SOLUTION: A foundation frame 20 includes a center body block 70 which is freely divided and cross-coupled in a cross shape and legs 80 which are joined to radially extend from end parts of the center body block 70. Since the coupling structure of the center body block 70 and the legs 80 has a shear plate or a pin structure, the coupling structure only requires a small number of fastening members by dispensing with a flange, a joint plate, a bolt for joining and the like.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a base frame of a crane.

Background Art

[0002] Generally, for the construction of structures such as high-rise buildings and main towers of bridges, a climbing crane 10 as shown in FIG. 7 is used.

[0003] The climbing crane 10 includes a base frame 20, a mast 30, a lifting unit 40, and a slewing body 50.

[0004] The base frame 20 is a cross-shaped frame that is placed and fixed on a base surface B.

[0005] The mast 30 is erected by sequentially stacking mast blocks 31 on the base frame 20.

[0006] The lifting unit 40 includes a guide mast 41 and a lifting frame 42, and is movable up and down along the mast 30.

[0007] The slewing body 50 is rotatably disposed at the upper end of the lifting unit 40, and a jib 60 is provided so as to be able to rise and fall freely.

[0008] In particular, in the case of a large climbing crane 10 with a load moment (the product of the lifting radius and the lifted load) of generally 1000 tm or more, an integral base frame 20 cannot be transported due to the weight limit and dimension limit defined by the Road Traffic Law and the like.

[0009] Therefore, the base frame 20 is divided into a central main body block and legs, and the central main body block is further divided into a plurality of parts. These divided central main body blocks and legs are transported by trucks and assembled on site to form the base frame 20.

[0010] As the split base 20, a type in which a plurality of divided central body blocks are bolted together with flanges and the central body block and the legs are bolted together with gusset plates has been conventionally adopted.

[0011] In addition, as an indication of the general technical level related to the crane base, for example, there is Patent Document 1.

Prior Art Documents

Patent Documents

[0012]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0013] However, in the conventional split base 20, the number of fastening members such as bolts for joining the flanges and gusset plates is extremely large, and it takes a long time for assembly and disassembly, resulting in a problem of reduced efficiency.

[0014] The present invention has been made in view of the above conventional problems, and aims to provide a crane base that can be transported and can be easily assembled and disassembled.

Means for Solving the Problems

[0015] The present invention relates to A base pedestal for a crane that stands a mast, comprising a central body block that is separable and cross-connected in a cross shape, and legs joined so as to project radially from the ends of the central body block. The central body block includes a receiving-side split block having a receiving-side concave groove formed at the center of the upper surface and load transmission portions projecting outward at both longitudinal ends, and an assembling-side split block having an assembling-side concave groove formed at the center of the lower surface for fitting with the receiving-side concave groove and load transmission portions projecting outward at both longitudinal ends. The leg joined to the receiving-side split block includes a jaw portion that receives a downward load acting on the load transmission portion of the receiving-side split block, a joint surface that is pressed against the end surface of the load transmission portion of the receiving-side split block by the downward load received by the jaw portion, and a fastening member that fixes the joint surface to the end surface of the load transmission portion of the receiving-side split block. The leg joined to the assembling-side split block includes a jaw portion that receives a downward load acting on the load transmission portion of the assembling-side split block, a joint surface that is pressed against the end surface of the load transmission portion of the assembling-side split block by the downward load received by the jaw portion, and a fastening member that fixes the joint surface to the end surface of the load transmission portion of the assembling-side split block a crane base having.

[0017] Further, in the crane base, a shear plate attached to the lower surface of the load transmission part, a shear plate attached to the upper surface of the jaw part of the leg so as to engage with the shear plate and prevent the outward movement of the leg It can also be provided with.

[0018] Further, the present invention A base pedestal for a crane that stands a mast, comprising a central body block that is separable and cross-connected in a cross shape, and legs joined so as to project radially from the ends of the central body block. The central body block includes a receiving-side split block having a receiving-side concave groove formed at the center of the upper surface and load transmission brackets and stopper portions projecting outward at both longitudinal ends, and an assembling-side split block having an assembling-side concave groove formed at the center of the lower surface and fitting with the receiving-side concave groove and load transmission brackets and stopper portions projecting outward at both longitudinal ends. The leg joined to the receiving-side split block includes a support bracket pin-connected to the load transmission bracket of the receiving-side split block to receive a downward load, a pressing portion pressed against the end surface of the stopper portion of the receiving-side split block by the downward load received by the support bracket, and a fastening member for fixing the pressing portion to the stopper portion of the receiving-side split block. The leg joined to the assembling-side split block includes a support bracket for receiving a downward load acting on the load transmission bracket of the assembling-side split block, a pressing portion pressed against the end surface of the stopper portion of the assembling-side split block by the downward load received by the support bracket, and a fastening member for fixing the pressing portion to the stopper portion of the assembling-side split block. It also relates to the base pedestal of the crane.

[0019] Furthermore, in the foundation base of the crane, it is particularly effective when the load acting on the legs due to the dead weight of the crane exceeds the buoyancy acting on the legs due to the overturning moment (rotational force) when lifting a load.

Advantages of the Invention

[0020] According to the foundation base of the crane of the present invention, it can achieve excellent effects of being transportable and being easily assembled and disassembled.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0023] Figs. 1 to 3 are a first embodiment of the base frame of the crane of the present invention. In Figs. 1 to 3, parts denoted by the same reference numerals as in Fig. 7 represent the same objects.

[0024] The base frame 20 in the first embodiment includes, as shown in Figs. 1 and 2, a central body block 70 that can be divided and cross-coupled in a cross shape, and legs 80 joined so as to project radially from the ends of the central body block 70.

[0025] The central body block 70 includes a receiving-side divided block 71 and an assembling-side divided block 72.

[0026] In the receiving-side divided block 71, a receiving-side concave groove 71a is formed at the center of the upper surface, and load transmission portions 71b project outward at both longitudinal ends. A sharp plate 71c is attached to the lower surface of the load transmission portion 71b.

[0027] The assembling-side split block 72 has an assembling-side concave groove 72a formed at the center of the lower surface to fit with the receiving-side concave groove 71a, and load transmission parts 72b projecting outward at both longitudinal ends. A sharp plate 72c is attached to the lower surface of the load transmission part 72b.

[0028] The leg 80 joined to the receiving-side split block 71 and the assembling-side split block 72 includes a jaw part 80a, a joining surface 80b, a sharp plate 80c, and a fastening member 80d.

[0029] The jaw part 80a is adapted to receive a downward load acting on the load transmission part 71b (or the load transmission part 72b of the assembling-side split block 72) of the receiving-side split block 71.

[0030] The joining surface 80b is pressed against the end face of the load transmission part 71b (or the end face of the load transmission part 72b of the assembling-side split block 72) of the receiving-side split block 71 by the downward load received by the jaw part 80a.

[0031] The sharp plate 80c is attached to the upper surface of the jaw part 80a to engage with the sharp plate 71c (or the sharp plate 72c of the assembling-side split block 72) of the receiving-side split block 71, and is adapted to prevent the outward movement of the leg 80.

[0032] As shown in FIG. 3, the fastening member 80d is adapted to fix the joining surface 80b to the end face of the load transmission part 71b (or the end face of the load transmission part 72b of the assembling-side split block 72) of the receiving-side split block 71.

[0033] Next, the operation of the first embodiment will be described.

[0034] As shown in FIG. 1, the foundation pedestal 20 is transported by a truck in a state of being divided into the receiving-side split block 71 and the assembling-side split block 72 of the central main body block 70 and the leg 80, and is assembled on-site as shown in FIG. 2.

[0035] Here, as shown in FIG. 2, the self-weight W of the climbing crane 10 from the mast 30 and the overturning moment M (rotational force) when lifting a load act on the central body block 70 of the base pedestal 20. Due to the overturning moment M, a downward pressing force D acts on one leg 80, and an upward floating force U acts on the other leg 80.

[0036] In this case, in order to suppress the floating force U, it is necessary to fix the base pedestal 20 to the ground foundation with anchor bolts.

[0037] However, if the load (W / 4) acting on one leg 80 due to the self-weight W exceeds the floating force U, that is, W / 4 > U is achieved, the upward floating of the leg 80 can be prevented, and the anchor bolts become unnecessary.

[0038] Moreover, if the anchor bolts become unnecessary and there is no fixation to the ground foundation, and only a downward force acts on the base pedestal 20, then the force that separates the receiving-side split block 71 and the assembling-side split block 72 of the central body block will not act, and there is no need to provide a means for firmly connecting the receiving-side split block 71 and the assembling-side split block 72.

[0039] On the other hand, as shown in FIG. 3, the downward load x acting on the load transmission portion 71b of the receiving-side split block 71 (or the load transmission portion 72b of the assembling-side split block 72) of the base pedestal 20 acts on the jaw portion 80a of the leg 80, so the leg 80 tends to rotate counterclockwise in FIG. 3.

[0040] As a result, the joint surface 80b of the leg 80 is always pressed against the end surface of the load transmission portion 71b of the receiving-side split block 71 (or the end surface of the load transmission portion 72b of the assembling-side split block 72) by the downward load x received by the jaw portion 80a.

[0041] Further, the sharp plate 80c attached to the upper surface of the jaw portion 80a engages with the sharp plate 71c of the receiving-side split block 71 (or the sharp plate 72c of the assembling-side split block 72), preventing the legs 80 from moving outward.

[0042] Therefore, the fastening member 80d that fixes the joint surface 80b to the end surface of the load transmission portion 71b of the receiving-side split block 71 (or the end surface of the load transmission portion 72b of the assembling-side split block 72) is not subjected to an excessive tensile force, and only the strength sufficient to suppress the displacement between the central main body block 70 and the legs 80 is required, so that the number of the fastening members 80d provided can be small.

[0043] As a result, in the first embodiment, unlike the conventional split-type base frame 20, flanges, eye plates, bolts for joining them, etc. are unnecessary, and only a small number of fastening members 80d are required, which saves time during assembly and disassembly and improves efficiency.

[0044] Thus, even if the base frame 20 in the first embodiment is large, it can be transported and assembled and disassembled easily.

[0045] Figs. 4 to 6 show a second embodiment of the base frame 20 of the crane of the present invention. In Figs. 4 to 6, the parts denoted by the same reference numerals as in Figs. 1 to 3 represent the same objects, and the basic configuration is the same as that of the first embodiment shown in Figs. 1 to 3.

[0046] In the case of the second embodiment, as shown in Figs. 4 and 5, load transmission brackets 71d and stopper portions 71e project outward from both longitudinal ends of the receiving-side split block 71 of the central main body block 70, and load transmission brackets 72d and stopper portions 72e project outward from both longitudinal ends of the assembling-side split block 72.

[0047] The legs 80 joined to the receiving-side split block 71 and the assembling-side split block 72 include support brackets 80e, pressing portions 80f, and fastening members 80d.

[0048] The support bracket 80e is connected to the load transfer bracket 71d of the receiving side split block 71 (or the load transfer bracket 72d of the assembling side split block 72) by a pin 80g so as to receive a downward load.

[0049] The pressing portion 80f is pressed against the end face of the stopper portion 71e of the receiving side split block 71 (or the stopper portion 72e of the assembling side split block 72) by the downward load received by the support bracket 80e.

[0050] As shown in FIG. 6, the fastening member 80d fixes the pressing portion 80f to the stopper portion 71e of the receiving side split block 71 (or the stopper portion 72e of the assembling side split block 72).

[0051] Next, the operation of the second embodiment will be described.

[0052] As shown in FIG. 4, the foundation base 20 is transported by a truck in a state of being divided into the receiving side split block 71 and the assembling side split block 72 of the central body block 70 and the legs 80, and is assembled on site as shown in FIG. 5.

[0053] Here, as shown in FIG. 5, the dead weight W of the climbing crane 10 from the mast 30 and the overturning moment M when lifting a load act on the central body block 70 of the foundation base 20. Due to the overturning moment M, a downward pressing force D acts on one leg 80 and an upward floating force U acts on the other leg 80. Therefore, in order to suppress the floating force U, it is necessary to fix the foundation base 20 to the ground foundation with anchor bolts, which is the same as in the case of the first embodiment.

[0054] However, also in the second embodiment, the load (W / 4) acting on one leg 80 due to the dead weight W exceeds the floating force U, that is, W / 4>U If this is achieved, the lifting of the leg 80 can be prevented and the anchor bolts become unnecessary.

[0055] Also, if the anchor bolts become unnecessary and there is no fixation to the ground foundation, and only a downward force acts on the foundation pedestal 20, a force that separates the receiving-side split block 71 and the assembling-side split block 72 of the central body block will not act, and there is no need to provide a means for firmly connecting the receiving-side split block 71 and the assembling-side split block 72.

[0056] On the other hand, as shown in FIG. 6, the downward load x acting on the load transmission bracket 71d of the receiving-side split block 71 (or the load transmission bracket 72d of the assembling-side split block 72) of the foundation pedestal 20 acts on the support bracket 80e of the leg 80 via the pin 80g. Therefore, the leg 80 tends to rotate counterclockwise about the pin 80g in FIG. 6.

[0057] As a result, the pressing portion 80f of the leg 80 is always pressed against the end face of the stopper portion 71e of the receiving-side split block 71 (or the end face of the stopper portion 72e of the assembling-side split block 72) by the downward load x received by the pin 80g.

[0058] Also, since the support bracket 80e of the leg 80 is connected to the load transmission bracket 71d of the receiving-side split block 71 (or the load transmission bracket 72d of the assembling-side split block 72) by the pin 80g, an excessive tensile force does not act on the fastening member 80d that fixes the pressing portion 80f to the end face of the stopper portion 71e of the receiving-side split block 71 (or the end face of the stopper portion 72e of the assembling-side split block 72). Only a strength sufficient to suppress the displacement between the central body block 70 and the leg 80 is required, and the number of the fastening members 80d provided in plurality can be small.

[0059] As a result, also in the second embodiment, unlike the conventional split-type foundation pedestal 20, flanges, eye plates, bolts for joining them, etc. become unnecessary, and only a small number of fastening members 80d are required. It does not take time during assembly and disassembly, and the efficiency is improved.

[0060] Thus, the foundation pedestal 20 in the second embodiment is also transportable and can be easily assembled and disassembled, similar to the first embodiment.

[0061] In the case of the first embodiment, there are provided sharp plates 71c and 72c attached to the lower surfaces of the load transmission portions 71b and 72b, and a sharp plate 80c attached to the upper surface of the jaw portion 80a of the leg 80 so as to engage with the sharp plates 71c and 72c and prevent the outward movement of the leg 80. With this configuration, it is effective in minimizing the strength and the number of fastening members 80d without applying an excessive tensile force to the fastening member 80d that fixes the joint surface 80b to the end surface of the load transmission portion 71b of the receiving-side split block 71 (or the end surface of the load transmission portion 72b of the assembling-side split block 72).

[0062] Also, in the case of the first embodiment and the second embodiment, the load acting on the leg 80 due to the dead weight W of the climbing crane 10 is configured to exceed the uplifting force U acting on the leg 80 due to the overturning moment M when the load is suspended. With this configuration, it is effective in preventing the leg 80 from lifting, eliminating the need for anchor bolts, eliminating the fixation to the ground foundation, applying only a downward force to the foundation base 20, and eliminating the means for separating the receiving-side split block 71 and the assembling-side split block 72 without applying a force to separate the receiving-side split block 71 and the assembling-side split block 72, and firmly connecting the receiving-side split block 71 and the assembling-side split block 72.

[0063] Note that the foundation base of the crane of the present invention is not limited to the above-described embodiments, and can be applied to cranes other than climbing cranes. Of course, various modifications can be made without departing from the gist of the present invention.

Explanation of Reference Numerals

[0064] 10 Climbing crane (crane) 20 Foundation base 30 Mast 31 Mast block 40 Lifting unit 41 Guide mast 42 Lifting frame 50 Slewing body 60 Jib 70 Central body block 71 Receiving-side split block 71a Receiving-side concave groove 71b Load transmission part 71c Sharp plate 71d Load transmission bracket 71e Stopper part 72 Assembly-side split block 72a Assembly-side concave groove 72b Load transmission part 72c Sharp plate 72d Load transmission bracket 72e Stopper part 80 Leg 80a Jaw part 80b Joint surface 80c Sharp plate 80d Fastening member 80e Support bracket 80f Pressing part 80g Pin B Base surface W Self-weight M Overturning moment D Pressing force U Buoyancy x Load

Claims

A base frame of a crane for erecting a mast, comprising a central body block that can be disassembled and cross - joined in a cross shape, and legs joined so as to project radially from the ends of the central body block, wherein the central body block includes a receiving - side split block having a receiving - side concave groove formed at the center of the upper surface and load - transmitting portions projecting outward at both longitudinal ends, and an assembling - side split block having an assembling - side concave groove formed at the center of the lower surface for fitting with the receiving - side concave groove and load - transmitting portions projecting outward at both longitudinal ends, the legs joined to the receiving - side split block include a jaw portion for receiving a downward load acting on the load - transmitting portion of the receiving - side split block, a joint surface pressed against the end face of the load - transmitting portion of the receiving - side split block by the downward load received by the jaw portion, and a fastening member for fixing the joint surface to the end face of the load - transmitting portion of the receiving - side split block, the legs joined to the assembling - side split block include a jaw portion for receiving a downward load acting on the load - transmitting portion of the assembling - side split block, a joint surface pressed against the end face of the load - transmitting portion of the assembling - side split block by the downward load received by the jaw portion, and a fastening member for fixing the joint surface to the end face of the load - transmitting portion of the assembling - side split block.

2. a sharp plate attached to the lower surface of the load - transmitting portion, and a sharp plate attached to the upper surface of the jaw portion of the leg so as to engage with the sharp plate and prevent outward movement of the leg. The base frame of the crane according to claim 1, comprising the above.

3. A base frame of a crane for erecting a mast, comprising a central body block that can be disassembled and cross - joined in a cross shape, and legs joined so as to project radially from the ends of the central body block, wherein the central body block includes a receiving - side split block having a receiving - side concave groove formed at the center of the upper surface and load - transmitting brackets and stopper portions projecting outward at both longitudinal ends, and an assembling - side split block having an assembling - side concave groove formed at the center of the lower surface for fitting with the receiving - side concave groove and load - transmitting brackets and stopper portions projecting outward at both longitudinal ends, The leg joined to the receiving-side split block includes a support bracket that is pin-connected to the load transfer bracket of the receiving-side split block and receives a downward load, a pressing portion that is pressed against the end face of the stopper portion of the receiving-side split block by the downward load received by the support bracket, and a fastening member that fixes the pressing portion to the stopper portion of the receiving-side split block. The leg joined to the assembling-side split block includes a support bracket that receives a downward load acting on the load transfer bracket of the assembling-side split block, a pressing portion that is pressed against the end face of the stopper portion of the assembling-side split block by the downward load received by the support bracket, and a fastening member that fixes the pressing portion to the stopper portion of the assembling-side split block, which is the foundation base of the crane.

4. The foundation base of the crane according to any one of claims 1 to 3, wherein the load acting on the leg due to the dead weight of the crane exceeds the upward force acting on the leg due to the overturning moment when lifting a load.

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