JP4587413B2 - Jib crane - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a jib crane temporarily installed on an upper part of a concrete structure.
[0002]
[Prior art]
When constructing a plant or a building, a jib crane is often used temporarily to take in materials. When a jib crane is temporarily installed on a concrete structure, a number of anchor bolts are temporarily placed on the concrete structure, and the foundation of the jib crane is fixed to the concrete structure using the anchor bolt. In order to resist the moment applied to the foundation of the jib crane when the material is hung, it is necessary to drive anchor bolts over a wide range, but when the concrete structure is wall-like, the top surface However, it is necessary to place anchor bolts on the side surfaces.
[0003]
However, it is difficult to accurately align the foundation with a large number of anchor bolts that are 90 ° or 180 ° in different directions on the top and both sides, and the temporary work of the jib crane is a long and labor-intensive operation. Met. Moreover, since it is a work at a high place, there are many problems in terms of safety. Temporary jib cranes were removed after the completion of the work, but it was also difficult to cure the concrete surface so that many anchor bolts were cut and no traces were left.
[0004]
In general, as a method of temporarily attaching and detaching construction equipment, there is a method of clamping the fixed part with a bolt provided there as a clamp method, but in the case as described above, It was doubtful that the reaction force and frictional force required by the jib crane could be obtained by clamping a concrete surface whose surface was not smooth enough with a bolt as a fixed object, and was not put into practical use.
[0005]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to provide a jib crane that can be easily attached to and detached from the upper part of a concrete structure.
[0006]
[Means for Solving the Problems]
The present invention has a gate-type foundation that straddles the upper part of a concrete structure, and is provided with push bolts that sandwich and fix the concrete structure from both sides with a backing plate via a spherical bush on both legs constituting the gate type Jib crane.
[0007]
In general, when a jib crane is temporarily installed at the top of a concrete structure and the material is taken in, the concrete structure often forms a wall shape, and the material is often taken in over the wall.
The foundation part of the jib crane is formed in a gate shape that straddles the concrete wall, and push bolts that push inward are provided on the parts of both legs that form the gate shape, and each push bolt has a backing plate through a spherical bush. It is a jib crane that fixes a concrete structure by pressing the concrete wall surface with the pad and sandwiching the concrete structure from both sides.
[0008]
Rather than pushing concrete walls directly with push bolts, each push bolt is provided with a backing plate via a spherical bush, and by pressing the concrete wall surface with that backing plate, even against a concrete surface whose surface is not necessarily smooth enough The contact surface of each push bolt adapts, making it possible to fully utilize the bearing stress of concrete and the frictional force between the concrete wall and the backing plate.
Therefore, as long as the tightening torque management of the push bolts is performed reliably, the reaction force and friction force that each push bolt should bear can be sufficiently secured.
[0009]
According to the present invention, (1) there is no need to temporarily place anchor bolts on the concrete structure, so there is no need for placing work, cutting or curing work when removing, and (2) matching the foundation part of the jib crane to the anchor bolts. There is no longer work that requires long manpower to fit different anchor bolts in 90 ° or 180 ° directions, and as a result, temporary work of jib cranes is easier to install and remove, and , (4) The effect of being able to work safely is obtained.
[0010]
In addition, the present invention has a gate-shaped foundation that straddles the upper part of the concrete structure, and a push bolt that fixes the concrete structure by sandwiching the concrete structure from both sides with a contact plate via a spherical bush on both legs constituting the gate shape Is a jib crane having anchor bolts arranged in a direction perpendicular to the direction in which the push bolt sandwiches the concrete structure.
[0011]
As described above, in general, when a jib crane is temporarily installed on an upper portion of a concrete structure and materials are taken in, the concrete structure often has a wall shape.
When anchor bolts are placed only on the top surface of such a wall-like concrete structure to fix the jib crane, a sufficient distance from the center of the jib crane post to the anchor bolt cannot be taken in the wall thickness direction. Since only the anchor bolt standing on the upper surface can not resist the moment applied to the foundation part, hitherto, the anchor bolt was hit to the side, but there is a case where it is not necessary because a sufficient distance can be taken in the longitudinal direction of the wall. Many. In such a case, only the wall thickness direction is clamped with a push bolt to give a necessary reaction force, and the longitudinal direction receives a moment applied to the foundation portion by an anchor bolt placed on the upper surface of the concrete structure. The position of the anchor bolt is perpendicular to the longitudinal direction of the concrete wall, that is, the direction in which the push bolt sandwiches the concrete structure, as viewed from the center of the jib crane post.
[0012]
According to the present invention, (5) the anchor bolts are arranged only in the direction perpendicular to the direction in which the push bolts sandwich the concrete structure, so the number of anchor bolts is greatly reduced compared to the conventional method of arranging in all directions. Cutting and curing work during installation and removal is reduced. (6) Since the anchor bolt is only on the top surface of the concrete structure, the work of aligning the foundation part of the jib crane with the anchor bolt is the conventional 90 ° or 180 ° direction. As compared with the case of fitting to different anchor bolts, the effect that it becomes extremely easy is obtained, and as a result, the above-mentioned effects (3) and (4) are obtained.
[0013]
In addition, the present invention provides a base that combines two orthogonal gates straddling the upper part of a columnar concrete structure, or a square that covers the upper part of a columnar concrete structure formed by connecting the four legs next to each other. This is a jib crane that has a sheath-like base part, and is provided with push bolts that clamp and fix a concrete structure from four sides with a backing plate via spherical bushes on four leg parts.
[0014]
When the concrete structure is columnar rather than wall-like, and the jib crane is temporarily installed on the top of the concrete structure, the foundation is constructed so that the two gates are orthogonal to each other, or the four legs Are connected to each other to form a rectangular sheath covering the upper end of the columnar concrete, and a push bolt is provided on each of these four legs, and the concrete structure is formed with a push bolt having a backing plate from four directions through a spherical bush. By adopting the structure of being clamped and fixed, the effects (1) to (4) described above can be obtained.
[0015]
Further, according to the present invention, in each of the above-described various jib cranes, the guide plate is provided with a guide protruding from the leg portion, and the size is changed in the thickness direction so that the contact plate can be freely tilted without hitting the guide. A jib crane having a plate.
[0016]
In the above-mentioned various jib cranes that are provided with push bolts that sandwich and fix a concrete structure from both sides with a backing plate via a spherical bushing, when the material is hung, it protrudes from the leg portion due to the moment applied to the base portion, and into the spherical bushing An upward or downward bending moment is generated at the tip of the push bolt that reaches it, causing galling or sticking between the push bolt and the female thread carved in the leg, which hinders subsequent tightening torque management and jib crane disassembly. May occur. If the length protruding from the leg is shortened, the influence of the bending moment can be mitigated, but considering the manufacturing accuracy of the foundation and concrete structure, there is a limit to shortening.
[0017]
Therefore, a guide with a size that fits the dimensions of the backing plate is projected from the leg, and the guide is strong enough to bend the tip of the push bolt, that is, press the center of the backing plate. When a force that shifts from the center of the bolt is applied, the force is transmitted directly from the contact plate to the leg through the guide, thereby reducing the bending moment applied to the push bolt when the material is suspended.
For that purpose, when the backing plate is moved forward or backward by the push bolt, it does not become a resistance, and when the bending moment occurs and the center of the backing plate is slightly displaced, it contacts the backing plate and receives the load. Thus, the inner method of the guide is determined by adding a slight gap to the size of the backing plate.
[0018]
On the other hand, the contact plate is connected to the push bolt via the spherical bush and must be inclined in conformity with the surface of the concrete structure. Further, the backing plate has a considerable thickness due to its strength requirements. Accordingly, if the dimension of the contact plate in the thickness direction is constant, the corner portion of the contact plate hits the inner surface of the guide having a slight gap when tilted, and the tilting operation is hindered. Therefore, change the dimension in the thickness direction of the backing plate so that it does not hit the inner surface of the guide even if it tilts, that is, the backing plate closest to the center of rotation by the spherical bush in the thickness direction of the backing plate To meet the two requirements of free tilting and contact by slight change of the backing plate by matching the dimensions of the guide to the guide's inner method and reducing the dimensions within the range where it does not hit otherwise. Can do.
[0019]
According to the present invention, (7) the push bolt and the female threaded portion of the leg are prevented from being galled and stuck, and (8) the free inclination of the backing plate is ensured, and the reaction force and frictional force to be borne by the push bolt are reduced. The effect that it can secure enough is acquired.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. Needless to say, the present invention is not limited to such embodiments, and various modifications may be made to the specific structure within the scope of the present invention.
[0021]
FIG. 1 is a side view of an embodiment of the present invention. The jib crane 1 includes a jib 12 that supports a lifting device 11 such as a chain block, a post 13 that supports the lifting device 11, and a base portion 2, and a material that is lifted by the lifting device 11 such as a chain block (not shown). Is lifted to a predetermined position by the lifting device 11 traveling along the jib 12 and by rotating the jib 12 by the turning mechanism 14 provided on the post 13.
[0022]
In order to clarify the configuration of the base portion 2, FIG. 2 shows an AA arrow view of FIG. 1, and FIG. 3 shows an BB arrow view of FIG. The base portion 2 includes a ceiling portion 21 and leg portions 22 extending downward from both ends thereof, a plate 23 formed in a gate shape so as to straddle the concrete structure 15, a reinforcing plate 24 for reinforcing the strength thereof, and a base portion 2 and a top plate 25 connecting the post 13. A sufficient number of push bolts 3 are provided on both leg portions of the gate-shaped plate 23 to generate the reaction force and frictional force necessary for the base portion. The shape, plate thickness, and number of reinforcing plates 24 that reinforce the plate 23 are determined according to the reaction force when the push bolt 3 is tightened. To these push bolts 3, a backing plate 4 is attached via a spherical bush (not shown in FIGS. 2 and 3). By tightening the push bolt 3 while managing the tightening torque, The jib crane 1 is fixed by sandwiching the concrete structure 15 from both sides so that the contact plate 4 conforms to the wall surface of the concrete structure 15.
[0023]
An example of a combination of the push bolt 3, the spherical bush, and the contact plate 4 is shown in FIG. The spherical bush is composed of a combination of a male 32 having a shape obtained by cutting out a part of the spherical surface and a female 35 having a concave surface portion that fits the spherical surface portion, and both of them easily slide to absorb axial displacement. On the other hand, it is a component that transmits the force pushing from one side to the other. Here, a male 32 of the spherical bush is fixed to the tip 31 of the push bolt 3 by a pressing plate 33 and a set screw 34, while a female 35 of the spherical bush is fixed to the backing plate 4. In order to prevent the male 32 and female 35 of the spherical bush from falling apart, a stopper plate 37 is attached to the backing plate 4 by a presser screw 38 so as to surround the male 32 of the spherical bush.
[0024]
By adopting this configuration, even if the surface of the concrete structure is not a plane perpendicular to the axial direction of the push bolt 3, the contact plate 4 changes its direction in conformity with the surface, and the push bolt 3 is The force generated by tightening is transmitted to the concrete structure through the contact plate 4 without waste.
[0025]
FIG. 5 is a drawing in which a basic part of a side view of another embodiment of the present invention is taken out. The CC arrow line view of FIG. 5 is shown in FIG. The base portion 5 of the present embodiment includes a plate 51 formed in a gate shape so as to straddle the concrete structure 15, a reinforcing plate 52 that reinforces its strength, and a top plate 53 that connects the base portion 5 and the post 13. A sufficient number of push bolts 3 for generating the reaction force and friction force necessary for the base portion are arranged on both legs of the plate 51 formed of a combination and formed in a gate shape. The place where the backing plate 4 is attached via the spherical bush is the same as that of the base portion 2 of the case described above.
In addition to these components, in the base portion 5 of the present embodiment, the anchor bolts 6 are arranged in a direction perpendicular to the direction in which the push bolt 3 sandwiches the concrete structure 15, that is, in the longitudinal direction of the wall of the concrete structure 15. The base plate 5 is fixed by extending the side plate 54 having the receiving plate 55 from the portal portion toward the anchor bolt 6 and fastening the receiving plate 55 to the anchor bolt 6 with the nut 61.
[0026]
According to this embodiment, although anchor bolts are used for fixing the foundation portion, the number of anchor bolts is greatly reduced compared to the conventional method that relies only on anchor bolts, and the few anchor bolts are used in concrete structures. Since it is planted on only one surface, the upper surface, it is much easier to match the base to the anchor bolt.
[0027]
FIG. 7 is a side view of a base part according to still another embodiment of the present invention, and FIG. 8 is a DD arrow view thereof. In this embodiment, the concrete structure 16 has a columnar shape, and the foundation portion 7 of the jib crane connects the sheath-like plate 71 that covers the upper portion thereof, the reinforcing plate 72 that reinforces the strength thereof, and the foundation portion 7 and the post 13. A sufficient number of push bolts 3 are arranged on the leg portion of the plate 71 formed by a combination of the top plates 73 and formed on the sheath to generate the reaction force and frictional force necessary for the base portion. These press bolts 3 are the same as the above-mentioned base portion of the case where the contact plate 4 is attached via a spherical bush (not shown).
In this case, the concrete structure that is the object to be fixed was columnar, so the two gate-shaped foundations straddling the upper part were placed perpendicular to each other, and the adjacent legs were connected to each other. It is also considered that the strength of the is strengthened by connection.
[0028]
By tightening the push bolts 3 provided on the four surfaces while controlling the torque, the jib crane can be easily fixed without using anchor bolts.
[0029]
An example of a combination of a guide and a backing plate when a guide is provided on the backing plate is shown in FIG. (A) A figure shows a front view, (b) A figure shows the EE arrow line view.
A male 32 of a spherical bush is fixed to the tip portion 31 of the push bolt, and a female 35 combined therewith is fixed to the abutting plate 40. A stopper plate 39 is attached to the contact plate 40 by a press screw 38 so that the push bolt and the contact plate 40 do not fall apart.
A guide 45 is fixed to the plate 23 formed in a gate shape in the vicinity of the contact plate 40. The shape of the guide is determined in accordance with the shape of the contact plate because it contacts and receives the force when the center of the contact plate 40 is displaced from the center of the push bolt. In general, since the contact plate is formed in a disk shape as in this example, the guide takes the shape of a ring surrounding the guide plate. Since the displacement of the backing plate caused by the moment applied to the base when the material is suspended is either upward or downward, the guide is not a complete ring, but the upper and lower parts of the ring as shown in the figure Even if the shape is only taken out, the effect is the same, and it is desirable to divide it up and down in this way, considering the ease of work when installing the guide.
[0030]
A state in which the contact plate 40 is inclined according to the surface of the concrete structure to be pressed is indicated by a two-dot chain line 43. For the purpose of providing a guide, the gap between the backing plate 40 and the guide 45 should be as narrow as possible within the range where they do not touch each other. May come into contact with the guide. Therefore, in order to avoid contact and guarantee a free inclination, the shape of the contact plate 40 is changed in the thickness direction.
In the case of this figure, the center of rotation of the contact plate by the spherical bush is on the back side of the contact plate, that is, the side to which the slip-off preventing plate 39 is attached, so the outer diameter of the back surface of the contact plate 40 is used as a base. The inner diameter of the guide 45 is set so as to have a slight gap, and a circumferential recess 42 is provided in the middle part of the thickness of the backing plate 40 to avoid contact with the guide 45 in the inclined state 43. To do. Further, the surface portion of the contact plate 40 that does not come into contact with the guide even when tilted is made the same as the outer diameter of the back surface portion. By making the backing plate into a disk shape, it is easy to process the indentation on the side surface.
[0031]
By adopting the present embodiment, in addition to the effects (7) and (8) described above, (9) the effect that it is easy to manufacture the backing plate and attach the guide can be obtained.
[0032]
【The invention's effect】
According to the present invention, there is no need to temporarily lay anchor bolts on the concrete structure, or the number of the bolts is greatly reduced even when laid. Alternatively, the work of fitting the base part of the jib crane to the anchor bolt, especially the work that takes a long time to fit the anchor bolt of different 90 ° or 180 ° direction is eliminated, and the temporary work of the jib crane is attached and removed as a result. It becomes easier on both sides, and the effect of being able to work safely is obtained.
Further, according to the present invention, it is possible to prevent galling and sticking between the push bolt and the female thread portion of the leg, and to ensure a sufficient inclination force of the push bolt by guaranteeing a free inclination of the contact plate. Is obtained.
[Brief description of the drawings]
FIG. 1 is a side view of an embodiment of the present invention.
FIG. 2 is a view taken in the direction of arrows AA in FIG.
FIG. 3 is a view taken along arrow BB in FIG. 2;
4 is a view showing an example of a combination of a push bolt 3, a spherical bush, and a contact plate 4. FIG.
FIG. 5 is a side view of a base part according to another embodiment of the present invention.
6 is a view taken along the line CC of FIG. 5;
FIG. 7 is a side view of a base portion according to still another embodiment of the present invention.
FIG. 8 is a view taken along the line DD in FIG.
FIG. 9 is a drawing showing an example of a combination of a guide and a backing plate when a guide is provided.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Jib crane 2 Base part 3 Push bolt 4 Catch plate 5 Base part 6 Anchor bolt 7 Foundation part 11 Lifting equipment 12 Jib 13 Post 14 Turning mechanism 15 Concrete structure 16 Columnar concrete structure 21 Ceiling part 22 Leg part 23 Gate type Plate 24 Reinforcement plate 25 Top plate 31 Tip end 32 of the push bolt Spherical bush male 33 Presser plate 34 Set screw 35 Spherical bush female 37 Stopper plate 38 Presser screw 39 Stopper plate 40 Dimensions in the thickness direction 42 A plate-shaped plate 45 Reinforced plate 53 Top plate 54 Side plate 55 Receiving plate 61 Nut 71 Sheath shape Formed plate 72 Reinforcement plate 73 Top plate

Claims (3)

In a jib crane with a gate-type foundation straddling the top of a concrete structure, and provided with push bolts that sandwich and fix the concrete structure from both sides with a backing plate via a spherical bush on both legs constituting the gate type , A jib crane having a guide plate protruding from a leg portion on each contact plate and having a contact plate whose size is changed in the thickness direction so that the contact plate can be freely tilted without hitting the guide. 2. The jib crane according to claim 1, wherein the push bolts have anchor bolts arranged in a direction perpendicular to the direction in which the concrete structure is sandwiched , and each patch plate is provided with a guide protruding from the leg portion, and the patch plate is free without hitting the guide. A jib crane having a backing plate whose size is changed in the thickness direction so that it can be tilted. A base part combining two orthogonal gates straddling the upper part of a columnar concrete structure, or a square sheath-like base part covering the upper part of a columnar concrete structure formed by connecting the four legs next to each other. In the jib crane provided with push bolts that sandwich and fix the concrete structure from the four sides with a base plate via spherical bushes on the four leg parts , each base plate is provided with a guide protruding from the leg part. A jib crane having a backing plate whose size is changed in the thickness direction so that the backing plate can be freely tilted without hitting the guide.

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