JP2013220920A - Runway girder support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a runway girder support structure improved for forestalling a risk of incurring a fatigue destruction of a bolt jointing the lower side flange of a runway girder with the upper side flange of a hanging bracket because the runway girder, where the hoisting machine of a ceiling crane runs, incurs a downward flexure deformation like a joist supporting both ends and the ends of the runway girder supported on the hanging bracket warp up.SOLUTION: A supporting member 12, which loads to hang the ends of a runway girder 3 on the top of a support table 2 where the ends of the runway girder 3 are loaded and hung, is provided. The ends of the runway girder 3 are put to hang on the supporting member 12 on the support table. The ends of the runway girder 3 are constrained by a position displacement prevention means 10 or a drop prevention means provided at a position closer to the center in the material axis direction of the runway girder 3 than the position of the supporting member 12.

Description

  The present invention belongs to a technical field of a support structure of a portion in which a runway girder that supports a traveling rail (longitudinal rail) of an overhead crane is supported by a column jumping bracket or the like.

It is common practice to install overhead cranes in large span steel structures (factory buildings) such as factories. A trolley type crane or a hoist type crane widely used as an overhead crane employs a runway girder.
FIG. 10 conceptually shows an example of a trolley type overhead crane. The runway girder 3 is placed on and supported by the jumping bracket 2 that protrudes horizontally from the building pillar 1 to the indoor side, and the running rail 4 is installed on the upper flange upper surface of the runway girder 3 and required. A long runway is formed. A saddle 6 of a crane girder 5 travels on the traveling rail 4. The hoisting machine 7 is installed in the trolley that traverses in the longitudinal direction of the crane girder 5 that travels in this manner.

In the above-structured overhead crane (trolley type overhead crane), when the saddle 6 of the crane girder 5 travels on the traveling rail 4 of the runway girder 3, the trolley hoisting machine 7 suspends a heavy load (suspended load). When moving at (3), due to their weight load, the runway girder 3 is slightly exaggerated in FIG. Incidentally, the runway girder 3 is usually made of a tall H-section steel.
When the runway girder 3 is bent downward and deformed like a support beam at both ends as illustrated by reference numeral 3 'in FIG. 11, the end portion of the runway girder 3 inevitably expands to the right side in FIG. Then, as illustrated, an upward warp is generated with the outer edge of the upper flange 2a of the pop-up bracket 2 as the fulcrum S. Therefore, a large upward axial force (tensile force) is applied to the vertical bolt 10 that joins the lower flange 3a of the runway girder 3 and the upper flange 2a of the jump bracket 2 with the action of a so-called lever. Moreover, each time the saddle 6 of the crane girder 5 reciprocates on the running rail 4 of the runway girder 3, the upward axial force is repeatedly applied to the bolt 10 repeatedly. In addition, when a dynamic load associated with loading or unloading of a suspended load is applied, it repeatedly acts. For this reason, the fatigue level of the bolt 10 advances rapidly, and there is a high risk of causing fatigue failure. Therefore, countermeasures are considered important.

From the above viewpoint, referring to the past prior art, first of all, the invention “Crane Girder Crest Fixing Device” disclosed in the following Patent Document 1 places both ends of the runway girder of the overhead crane on the stigma. The gusset plate welded to the upper flange of the girder is not able to follow the deflection of the runway girder and related movements, and the upper flange of the girder. There is a drawback that the welded portion of the welded gusset plate and the position following the bolt hole are cracked and easily damaged. Therefore, as means for solving the above-mentioned drawbacks, the bolt holes for bolting the lower flange of the girder to the head of the girder are long holes, and the bolt holes for bolting the gusset plate to the upper column are also long holes in the girder length direction. The structure which was formed and solved is recognized.
In addition, the invention “crane stiffening structure” disclosed in Patent Literature 2 below repeatedly receives a large concentrated load from a trolley traveling on a rail at a rail installation location in a traverse box girder of an overhead crane. Since there is a problem that fatigue cracks are generated in the welded portion immediately below, a configuration in which concrete is installed directly under the rail is recognized as a means for solving this.

JP-A-6-179593 JP 2010-208792 A

The above-mentioned two prior arts raise technical problems regarding overhead crane girders. Although the proposed problem location (location) and the cause of its occurrence are slightly different, it is an improvement proposal for the purpose of preventing fatigue failure of members, so it can be used as a reference.
However, the problem to be solved by the present invention is that the crane travels and moves in a state where the hoisting machine suspends a heavy object (suspended load) as already described with reference to reference numeral 3 'in FIGS. The runway girder generates a downward bending deformation like a support beam at both ends due to a heavy load at the time, or a dynamic load accompanying a change in loading or unloading, and the end of the runway girder 3 is located on the right side in FIG. As illustrated, this is a solution to the problem caused by the occurrence of upward warping with the outer edge of the upper flange 2a as the fulcrum S on the jumping bracket 2. That is, a large upward axial force with a so-called lever action is applied to the bolt 10 that joins the lower flange 3a of the runway girder 3 and the upper flange 2a of the spring-out bracket 2. Moreover, the upward axial force is dynamically applied repeatedly with the operation of the crane. Therefore, the bolt 10 has a high risk of fatigue due to the repeated load and causing fatigue failure.
The present invention aims to prevent fatigue and breakage of the bolt 10 in advance, but the above two prior arts can never solve the problem.

  The object of the present invention is that the runway girder is supported at both ends by a heavy load when the overhead crane hoisting machine travels and moves in a state where a heavy load (suspended load) is suspended, or a dynamic load accompanying loading or unloading. As shown in the figure below, the end of the runway girder that is bent downward and the end of the runway girder supported on the jumping bracket is warped upward, and the above phenomenon repeatedly acts like vibration, The runway girder support structure has been improved to prevent the risk of fatigue failure due to vertical bolts joining the side flange and the upper flange of the spring-out bracket, and the risk of fatigue failure or loosening of the bolt joints. Is to provide.

As a means for solving the above problems, a support structure for a runway girder according to the invention described in claim 1 is:
A fulcrum member 12 or 13 for mounting the end of the runway girder 3 is installed on the upper surface of the support 2 or 30 or 36 for mounting the end of the runway girder 3,
An end portion of the runway girder 3 is mounted on the fulcrum member 12 or 13 on the support base 2 or 30 or 36, and the end portion of the runway girder 3 is more than the position of the fulcrum member 12 or 13. 3 is characterized by being constrained by a positional deviation prevention means or a fall prevention means installed at a position near the center in the material axis direction.

The invention described in claim 2 is the runway girder support structure described in claim 1, wherein the fulcrum member installed on the support base is made of either a flat plate material, a bar material, or a cutting piece thereof. These fulcrum members are each fixed to the upper surface of the support base or installed in a restrained manner.
According to a third aspect of the present invention, in the runway girder support structure according to the first aspect, the positional deviation prevention means or the fall prevention means for restraining the runway girder 3 to the support base is a joint or positional deviation by a bolt and a nut. It is a structure for preventing misalignment by a prevention guide or a dowel.

  According to the fourth aspect of the present invention, in the runway girder support structure according to the third aspect, the restraint between the support base and the runway girder 3 mounted on the support base is joined by a bolt and a nut, or a position by a dowel The bolt hole or dowel hole in the case of performing the displacement prevention structure is either a hole provided in the lower flange 3a of the runway girder 3 or a hole provided in the spring-out bracket 2 which is a long hole extending in the material axis direction of the runway girder 3 It is formed as follows.

  According to the fifth aspect of the present invention, in the runway girder support structure according to the first aspect, a fulcrum member is installed on the upper flange 2a of the spring-out bracket 2 which is a support base to prevent positional deviation or fall prevention. When the flange width of the pop-up bracket 2 is insufficient for restraining by means, the rib plate 20 having a necessary flange width is added to widen the flange width to a required dimension.

According to the runway girder support structure of the present invention, the end of the runway girder 3 mounted on the support base (such as the jumping bracket 2) is slightly exaggerated on the right half of FIG. Since it is mounted on a fulcrum member (flat steel plate 12 or the like) installed on the upper flange 2a of the jump bracket 2, both flanges 2a and 3a have a gap C corresponding to the thickness of the fulcrum member 12 from the beginning. The bolt 10 (or the position shift prevention guide, etc., which is the same hereinafter) that is formed and is a position shift prevention means or a fall prevention means is positioned within the gap C.
Therefore, when the runway girder 3 is bent downward and deformed like a support beam at both ends as illustrated by reference numeral 3 'in FIG. 11 due to weight load or dynamic load, the end of the runway girder 3 is naturally Warps upward. However, as shown in the right half of FIG. 2, the end of the runway girder 3 always warps with the contact point with the fulcrum member 12 as the first fulcrum S ₁ or generates vibration in the same warp shape. Therefore, warping and vibration state of said end portion, the fulcrum member 12 and bolt 10 positioned near the center axis of member direction of the run-way girder 3 than the position of the fulcrum S ₁ is a contact of the range of the clearance C Located in. For this reason, it becomes a deformation | transformation of the direction (downward) which releases the clamping force of the nut 11 screwed in the bolt 10. FIG. Therefore, the bolt 10 and the nut 11 that restrain the lower flange 3a of the runway girder 3 to the support base (such as the jumping bracket 2) behaves to release (reduce) the axial force. The behavior does not increase. Therefore, there is no concern that the warp or vibration of the end portion of the runway girder 3 promotes fatigue of the bolt 10 or causes fatigue failure.
If the weight load and dynamic load acting on the runway girder 3 described above are extremely large, the lower flange 3a of the runway girder 3 is supported by the support base as shown by the two-dot chain line in FIG. (Hanedashi bracket 2) also led to a situation such as to generate a second fulcrum S ₂ in contact with the outer edge of the axial force to the bolt 10 only keep still released state, or to fatigue bolts 10, There is no concern of promoting fatigue failure.

It is the front view which showed Example 1 of the runway girder support structure by this invention about the principal part. It is explanatory drawing which exaggerated and showed the deformation | transformation state of the principal part of the runway girder support structure shown in FIG. It is the front view which showed Example 2 of the runway girder support structure by this invention. It is sectional drawing of the IV-IV line arrow instruct | indicated in FIG. A is a top view which showed the Example of the position shift prevention guide. B and C are sectional views taken along line bb and line cc indicated in FIG. A is a cross-sectional view showing an example of a position shift prevention structure using a downward dowel, and B is a cross-sectional view showing an embodiment of a position shift prevention structure using an upward dowel. It is the front view which showed the Example which expanded the width dimension of the upper side flange of a protrusion bracket (support stand). A is a perspective view showing a main part of a runway girder support structure in a reinforced concrete building, and B is a vertical sectional view showing a support structure of FIG. It is the side view which showed the runway girder support structure about the principal part when a runway girder is supported by the capital of a building. It is the perspective view which showed an example of the structure of the overhead crane about the principal part. It is the front view which exaggerated and showed the example of the bending deformation of the runway girder in a runway girder support structure a little. It is explanatory drawing which expanded the part enclosed with the circle | round | yen XII in FIG. 11, and exaggerated and showed the bending deformation state of the runway girder a little.

In the support structure of the runway girder according to the present invention, the fulcrum member 12 or 13 on which the end portion of the runway girder 3 is mounted is first installed on the upper surface of the support base 2 or 30 or 36 on which the end portion of the runway girder 3 is mounted. .
An end portion of the runway girder 3 is mounted on the fulcrum member 12 or 13 on the support base 2 or 30 or 36, and the end portion of the runway girder 3 is more than the position of the fulcrum member 12 or 13. It is set as the structure restrained by the position shift prevention means or the fall prevention means installed in the position near 3 material axis direction center.

The fulcrum member installed on the support base is made of either a flat plate, a bar, or a cutting piece thereof, and each of these fulcrum members is installed with its position fixed or constrained on the upper surface of the support base. Is done.
The misalignment prevention means or the fall prevention means for restraining the lower flange 3a of the runway girder 3 and the support base is a joint by a bolt and a nut, a misalignment prevention guide, or a misalignment prevention structure by a dowel.
The bolt hole or dowel hole when the restraint of the support base and the runway girder 3 mounted on the support base is implemented with a bolt and nut joint or a misalignment prevention structure with a dowel is provided on the lower flange 3a of the runway girder 3. Either the hole to be provided or the hole to be provided in the spring-out bracket 2 is formed as a long hole 15 that is long in the material axis direction of the runway girder 3.
Necessary when installing the fulcrum member on the upper flange 2a of the pop-up bracket 2, which is a support base, and restraining it with the position shift prevention structure or the drop-prevention means, when the flange width of the pop-up bracket 2 is insufficient. A rib plate 20 having an appropriate flange width is added to widen the flange width to a required dimension.

Hereinafter, the present invention will be described based on illustrated embodiments.
1 and 2 show Example 1 of a runway girder support structure using a flat steel plate 12 as a fulcrum member.
Moreover, in Example 1 of FIG. 1, as a support stand on which the end portion of the runway girder 3 is mounted, as shown in FIG. 10, a jumping bracket 2 attached so as to protrude horizontally inward from the pillar 1 of the building is used. I use it. The illustrated jump bracket 2 uses, as an example, an H-shaped steel with a flange width of 250 mm. As a fulcrum member on which the end of the runway girder 3 is mounted on the upper surface of the upper flange 2a, for example, the width dimension is A flat steel plate 12 having a thickness of about 250 mm and a thickness of about 12 mm is installed. The flat steel plate 12 is arranged long in the material axis direction of the protruding bracket 2 to a position closer to the center in the width direction of the upper flange 2a, and a plurality of positions are fixed by spot welding or continuous fillet welding. It is installed at. The end portions of the runway girders 3 and 3 on both sides of the flat steel plate 12 are placed with a slight gap (for example, about 3 to 5 mm).
The positioning and fixing process by spot welding of the flat steel plate 12 depends on the weight of the crane girder 5 traveling on the runway girder 3 and the dynamic load such as the load of the suspended load suspended by the hoisting machine 7 and the unloading thereof. It is sufficient to fix to the upper flange 2a to the extent that there is no fear of shifting.
However, the fulcrum member is not limited to the above steel plate, but may be a dissimilar metal plate or hard rubber (including silicone rubber and laminated rubber), a synthetic resin plate, a molded plate made of a polymer material, a carbon molded plate, etc. It can be carried out using a plate material made of a composite of materials, a bar material of the same material, or a cut piece thereof. In short, the fulcrum member can be selected and used as long as it can withstand the load applied from the runway girder and has heat resistance and chemical resistance. Incidentally, if it is an elastomer, a thermosetting epoxy resin or an olefin type thermoplastic elastomer is suitable, and if it is a plastic, an ABS resin or polypropylene is suitable.
Next, the lower flange 3a of the runway girder 3 and the upper flange 2a of the jump bracket 2 are formed on both outer edges in the width direction of the upper flange 2a of the jump bracket 2 from the outer edge of the flat steel plate 12 as a fulcrum member. The offset position is constrained by a position shift prevention means or a fall prevention means, for example, in the embodiment shown in FIG. 1, joined by a bolt 10 and a nut 11 screwed into the bolt 10.
In addition, regarding said nut 11, it is also preferable to use a well-known locking nut or to make it a double nut as a measure for preventing the locking. Of course, as the displacement prevention means or the fall prevention means, instead of the above-described joining by the bolt and nut, a restraining means described later can be implemented.
According to the configuration of the above embodiment, the runway is surrounded by the gap C equal to the thickness of the flat steel plate 12 around the bolt 10 that restrains the lower flange 3a of the runway girder 3 and the upper flange 2a of the jump bracket 2. A free space is formed to allow the lower flange 3a of the girder 3 to be deformed to warp upward due to an overload.
Therefore, it is preferable to insert a material such as a soft rubber sheet into the gap (particularly, the portion near the outer edge of the upper flange 2a of the jumping bracket 2) for the purpose of noise reduction and vibration isolation. Alternatively, it is also preferable to insert a spring material.

According to the above configuration, the runway girder 3 is bent downward like the support beams at both ends as exemplified by reference numeral 3 'in FIG. 11 due to the overload, and its end is in the right half in FIG. As illustrated by reference numeral 3 ′, the lower flange 3 a of the runway girder 3 and the upper flange of the spring-out bracket 2 even if the contact with the flat steel plate 12 as a fulcrum member is deformed upward with the fulcrum S ₁ as a fulcrum. With respect to the bolt 10 constrained to 2a, the tightening force by the nut 11 is released (reduced) but never increases. If the lower flange 3a of the run way girder 3, when occurring a second fulcrum S ₂ are largely deformed enough to contact the outer edge of the upper flange 2a of the bracket 2 Hanedashi also again fastening force by the nut 11 It remains in a disconnected state and does not increase.
In short, this is a phenomenon and effect because the restraint position by the bolt 10 is located in the free space formed by the gap C equal to the thickness of the flat steel plate 12 as the fulcrum member described above. Therefore, when the position where the bolt 10 is restrained is as far as possible from the outer edge of the flat steel plate 12 and the position close to the outer edge in the width direction of the upper flange 2a of the upper bracket 2a is selected to the structurally allowable limit, The configuration is more effective.
Since it depends on the above, the bolt hole provided when the lower flange 3a of the runway girder 3 on the jumping bracket 2 is restrained by the bolt 10 is at least the lower flange of the runway girder 3 as shown in FIG. If the bolt hole provided in 3a is formed as a long hole 15 that is long in the material axis direction of the runway girder 3, the above-described deformation of the lower flange 3a of the runway girder 3 is allowed without difficulty. Moreover, it becomes a structure which makes the alignment of the volt | bolt 10 easy, and is preferable. However, when the bolt hole provided in the upper flange 2a of the jumping bracket 2 is formed as a long hole extending in the material axis direction of the runway girder 3, the same effect can be obtained.

According to the above support structure of the present invention, as illustrated and described with reference to 3 'in FIG. 11, the weight of the crane girder that travels and moves on the runway girder 3, the load due to the suspended load, and the suspended load The runway girder 3 is deformed downward like a support beam at both ends due to vibrations caused by dynamic loading during loading and unloading, and the end of the runway girder 3 is illustrated in the right part of FIG. Then, deformation that warps upward on the jumping bracket 2 occurs. Alternatively it produces vibrations repeating similar deformation, the ends of the run-way girder 3 is only present a deformation decreases the free space downward to form a fulcrum S ₁ or S ₂ in contact with the flat steel plate 12 . Therefore, the fastening force (axial force) of the nut 11 screwed into the bolt 10 is rather applied to the bolt 10 positioned outside the fulcrum S ₁ (near the center of the runway girder 3 in the axial direction). It only exhibits a loosening movement. Therefore, there is no concern that the end of the runway girder 3 undergoes the warp deformation described above and the vibration that repeats the same deformation causes fatigue to the bolt 10 or progress to fatigue failure.
Incidentally, the thickness of the flat steel plate 12, in other words, the size of the gap C shown in FIG. 2 will be described as a condition for demonstrating the effectiveness of the above-described action and effect. When the width of 2a is 250 mm, C is calculated to be 0.32 mm or more. Therefore, if the flat steel plate 12 having a thickness equal to or greater than the C value is used, the above-described effects of the present invention can be obtained. Therefore, it can implement using the relatively thin flat steel plate 12, and can implement with little cost burden.

Next, the lower flange 3a of the end portion of the runway girder 3 is deformed to warp upward as described above, or to generate vibration that repeats the deformation, and the runway girder 3 As a countermeasure against a thermal phenomenon that expands and contracts in the direction of the material axis under the influence of bolts, the bolt hole for bolting the lower flange 3a of the runway girder 3 is formed in the direction of the material axis of the runway girder 3 as shown in FIG. As described above, it is preferable to form the long long hole 15. This is because the bolt 10 is allowed to play within the margin dimension allowed by the elongated hole 15 and can absorb the vibration and expansion / contraction phenomenon of the runway girder 3. In this sense as well, it is possible to provide a support structure that does not have excessive load bearing performance.
In the above case, the bolt hole provided in the upper flange 2a of the jumping bracket 2 which is a support base is formed by forming a long hole in the material axis direction of the runway girder 3, or conversely, the runway girder 3 Even if the lower flange 3a is a round hole and the bolt hole provided in the upper flange 2a of the jumping bracket 2 is a long hole, the same effect as described above can be obtained.

Next, FIG. 3 shows Example 2 of a runway girder support structure using a round steel bar 13 as a fulcrum member.
The basic principle of the configuration shown in the second embodiment is basically the same as that of the first embodiment. The reason why the round steel bar 13 is selected and used as the fulcrum member will be described.
As described in the first embodiment, when the end of the runway girder 3 is deformed to warp upward on the spring-out bracket 2 as illustrated in the right part of FIG. The fulcrum is formed at a position closer to the center in the width direction of the protruding bracket 2 than the position where the end of the runway girder 3 is constrained by the bolt 10, and the outer edge of the upper flange 2a of the protruding bracket 2 from the fulcrum. A free space of the gap C is formed at the offset position, and deformation (warpage) occurs in which the end portion of the runway girder 3 hangs downward in the free space. Therefore, although the axial force due to the tightening force of the nut 11 screwed into the bolt 10 is reduced, it never increases and does not cause fatigue failure.
In other words, as long as the bolt 10 is located in the above-described free space C, there is no fear that the bolt 10 will be fatigued by the deformation of the end portion of the runway girder 3 and the vibration that repeats the deformation, or that the fatigue failure will occur. As described above.
As a condition for demonstrating the effectiveness of the above action and effect, the size of the gap C shown in FIG. 2 is such that when the width dimension of the upper flange 2a of the pop-up bracket 2 is 250 mm, C is 0.32 mm or more. I have already explained that this is sufficient. In short, if the round steel rod 13 having an outer diameter that forms the gap C having the above-mentioned size is selected and used as a fulcrum member, the effects of the present invention can be reliably expected.

By the way, as compared with preparing a flat steel plate 12 having a thickness for forming the gap C of the above-mentioned size, a round steel bar 13 having an outer diameter C ′ sufficient to form the gap or a steel bar is prepared. Is practically easy. The second embodiment has been proposed in consideration of such circumstances.
That is, in the case of the embodiment 2 shown in FIG. 3, the round steel bar 13 having the above-mentioned outer diameter C ′ is moved to the center position in the width direction on the upper flange 2a of the pop-up bracket 2 which is also a support. It is set as the structure arrange | positioned in the material axis direction. And as a positioning means (restraint means) for preventing the trouble that the round steel bar 13 rolls on the upper surface of the flange 2a, the round steel bar 13 is arranged in close contact with both side positions along the round steel bar 13 in parallel. A rolling stop material 14 such as a piece is disposed. It is set as the structure fixed to the upper side flange 2a of the jumping bracket 2 by carrying out the spot welding etc. of the several places of this rolling stop material 14. FIG.
In the case of the second embodiment, it is a precondition that the round steel bar 13 has the outer diameter C ′. However, the rolling stopper 14 may naturally have a smaller or thinner diameter than the outer diameter of the round steel bar 13. As long as unnecessary rolling of the round steel bar 13 can be restrained, the outer diameter or thickness thereof may be small. Further, the shape is not limited as long as the effect of rolling prevention is exhibited. Of course, the rolling stop material 14 does not need to have the same length in the length direction of the round steel bar 13. What is necessary is just to set it as the structure which arrange | positions several steel pieces along the length direction of the round steel bar 13, and fixes to the upper side flange 2a of the jumping bracket 2 by welding etc., and has a rolling stop effect | action.
If the same idea is further developed, instead of using the round steel bar 13, a square steel bar is used, or a piece of steel such as a round steel bar or a square steel bar is cut off from the upper flange 2 a of the pop-up bracket 2. A configuration in which the fulcrum member is used by being arranged in the material axis direction near the center in the width direction and fixed by welding or the like can be similarly implemented.

According to the configuration in which the round steel bar 13 is used as a fulcrum member as in the second embodiment shown in FIG. 3, the runway girder 3 is directed downward like the both end support beams as illustrated by reference numeral 3 'in FIG. 2 and when the end of the runway girder 3 is deformed to warp upward on the jumping bracket 2 as illustrated in the right part of FIG. depending on the thermal expansion and contraction phenomenon caused by delicate stretching movement, or heat and cold like temperatures to at will it axially occurring wood axis direction in the run-way girder 3, the round steel bar 13 forming the fulcrum S ₁ Roll and respond flexibly. That is, the advantage of not causing the disadvantage of generating unnecessary friction and stress can be obtained. At the same time, as illustrated in FIG. 4, when the bolt hole used for restraint by the bolt 10 is formed in the long hole 15, the function is more effectively performed.

Next, FIGS. 5A to 5C show a third embodiment of the runway girder support structure using the misalignment prevention guide.
In this embodiment, the fulcrum member 12 is installed on the upper flange 2a of the jumping bracket 2 as described above, and the end of the lower flange 3a of the runway girder 3 is mounted thereon. The upper flange 2a of the pop-up bracket 2 and the lower flange 3a of the runway girder 3 are not limited to means for fastening and joining with the bolts 10 and nuts 11 described above, but prevent the runway girder 3 from being displaced or dropped. It is shown that the guide means restrained to such an extent that it can be prevented is sufficient.
That is, FIG. 5A shows a configuration in which two kinds of positional deviation prevention guides 41 and 42 are used as a restraining means for convenience, but of course, any one kind of positional deviation prevention guides 41 or 42 is adopted as the restraining means. It is sufficient if it is implemented.
Incidentally, FIG. 5B shows that along the both side surfaces of the lower flange 3a of the runway guard 3 installed on the jump bracket 2, the jump of the lower flange 3a is restrained when the runway guard 3 vibrates to prevent positional deviation. However, an embodiment in which flat plate-shaped misalignment prevention guides 41 and 41 having a height sufficient to prevent the fall are provided is shown.
5C shows an inward direction that restrains the jumping of the lower flange 3a along the both side surfaces of the lower flange 3a of the runway girder 3 installed on the jumping bracket 2 when the runway girder 3 vibrates. An embodiment is shown in which the misalignment prevention guides 42 and 42 each having a hook-shaped bent portion are installed to prevent misalignment or prevent falling.

Next, FIGS. 6A and 6B show a fourth embodiment of a runway girder support structure in which a dowel misalignment prevention structure is used as a restraining means.
In the case of the fourth embodiment, FIG. 6A shows an example in which a downward dowel 43 is used, and FIG. 6B shows an example in which an upward dowel 43 is used. Incidentally, the dowels in this embodiment are simply bolt materials that have screws but do not use nuts, or steel bars that are not threaded at all. In the case of FIG. A dowel 43 welded vertically downward to the lower surface of the lower flange 3a is inserted into the dowel hole 44 formed in the upper flange 2a of the jumping bracket 2. The number of dowels 43 may be two or more.
In the case of FIG. 6B, the two dowels 43 welded vertically upward to the upper surface of the upper flange 2a of the jumping bracket 2 are inserted into the dowel hole 44 opened in the lower flange 3a of the runway girder 3. is there. In this case, even one dowel 43 is sufficient.
The height of the dowel 43 may be any height that prevents the runway girder 3 from being displaced or prevented from jumping and falling.
In the case of the embodiment shown in FIGS. 6A and 6B, if the dowel hole 44 is provided as a long hole that is long in the material axis direction of the runway girder 3, the response to deformation and expansion / contraction of the runway girder 3 is good and convenient as described above. It is.

Next, FIG. 7 shows Embodiment 5 of the runway girder support structure. The background of the present embodiment will be described as follows.
As can be understood from the first to fourth embodiments described above, the present invention is naturally applied to a newly installed overhead crane, but is also implemented in the same manner as a modification / reconstruction work of an existing overhead crane. be able to.
In that case, even if the present invention is to be implemented as a renovation / renovation work for an existing overhead crane, a fulcrum member is installed if the width of the upper flange 2a of the pop-up bracket 2 which is a support for the runway girder 3 is narrow. Thus, there are cases where it is impossible or impossible to restrain with a bolt or the like. A countermeasure in that case is shown in the fifth embodiment.
That is, in the fifth embodiment, both outer edges of the upper flange 2a are used as means for securing the width dimension necessary for carrying out the present invention for the upper flange 2a of the protruding bracket 2 having a small width dimension as described above. The rib plate 20 having the flange portion 20a having the flange width A sufficient to satisfy the width required for the implementation of the present invention is used. That is, FIG. 7 shows a configuration in which the flange portion 20a of the rib plate 20 is integrally extended along both outer edges of the upper flange 2a to widen it and achieve the object of carrying out the present invention. As a means for integrally adding the rib plate 20 and its flange portion 20a along both outer edges of the upper flange 2a, it is simplest and practical to join the added portion by continuous fillet welding.

  As described above, the flange portion 20a of the rib plate 20 is integrally extended along both outer edges of the upper flange 2a to widen the upper flange 2a of the pop-up bracket 2, and then supported on the upper surface of the upper flange 2a. It is the same as in the above embodiments that the member is installed, the end of the runway girder 3 is mounted on the member, and restrained by the bolt 10 or the like.

Next, in FIGS. 8A and 8B, the building in which the overhead crane is installed is reinforced concrete, and the support of the runway girder 3 is projected to the inner surface side of the reinforced concrete wall 35 (hereinafter referred to as RC bracket). ) 36 shows the runway girder support structure.
The basic configuration shown in the figure is much in common with each of the first to third embodiments. However, a support plate 37 is placed on the horizontal upper surface of the RC bracket 36 as an alternative to the upper flange 2 a of the jump bracket 2. Although not shown in detail in detail, the support plate 37 is installed by a method in which the support plate 37 is integrally driven into the upper surface of the RC bracket 36 or a method in which an anchor bolt or an anchor plug is implanted and attached to the upper surface of the RC bracket. The support plate 37 is provided with an upward bolt 38 corresponding to the bolt 10 described in the above embodiment (or the dowel 43 shown in FIG. 6B) on the upper surface thereof.
After the fulcrum member 12 is installed and fixed on the upper surface of the support plate 37, the end of the runway girder 3 is mounted on the fulcrum member 12, and the bolt hole provided in the lower flange of the runway girder 3 is formed as described above. The nut 39 is screwed and constrained from above through the bolt 38. When FIG. 8B is viewed in the front direction, the configuration shown in FIGS.
In addition, the support plate 37 of the present embodiment preferably employs a means for preventing the positional deviation described in the third embodiment and shown in FIG. Can be implemented.

Moreover, FIG. 9 has shown the Example in case the support stand of the runway girder 3 is the stigma of the steel-framed column 30 juxtaposed along the pillar 1 of the building inside. Reference numeral 31 denotes a connecting material for jutting the assembled columns 30 along the pillars 1 of the building.
Although various embodiments can be applied to the configuration in which the end portion of the runway girder 3 is supported as the runway girder support structure of the present invention described above on the stigma of the assembled column 30, as an example of a simple configuration, FIG. The configuration can be adopted and implemented.
That is, the support plate 37 is installed on the head of the assembled column 30, the fulcrum member 12 is installed and fixed on the support plate 37, and the end of the runway girder 3 is mounted on the fulcrum member 12. The lower flange 3 a of the runway girder 3 and the support plate 37 are constrained by bolts 38 and nuts 39.

  Although the present invention has been described based on the illustrated embodiment, the present invention is not limited to the configuration of the embodiment. I would like to remind you that it includes the scope of design changes and other applications and modifications that will be performed by those skilled in the art as needed.

1 Pillar 2 Bounce bracket (support)
2a Upper flange 3 Runway girder 3a Lower flange 10, 38 Bolt 12 Flat steel plate (fulcrum member)
13 Steel bar (fulcrum member)
15 Long hole (bolt hole)
20 Rib plate 20a Flange 30 Assembly pillar (support)
36 RC bracket (support)
41, 42 Misalignment prevention guide 43 Dowel 44 Dowel hole

Claims (5)

On the upper surface of the support base on which the end of the runway girder is mounted, a fulcrum member for mounting the end of the runway girder is installed,
An end portion of the runway girder is mounted on the fulcrum member on the support base, and the runway girder is installed at a position closer to the center of the runway girder in the material axis direction than the position of the fulcrum member or A runway girder support structure, characterized by being constrained by a fall prevention means.   The fulcrum member installed on the support base is made of either a flat plate, a bar, or a cutting piece thereof, and these fulcrum members are respectively fixed or constrained to the upper surface of the support base. The runway girder support structure according to claim 1, wherein the runway girder support structure is provided.   The position shift prevention means or the fall prevention means for restraining the runway girder to the support base is a joint with a bolt and a nut, or a position shift prevention guide, or a position shift prevention structure with a dowel. Support structure for the runway guard.   The bolt hole or dowel hole when the restraint between the support base and the runway girder mounted on the support base is performed with a bolt and nut connection or a dowel displacement prevention structure is a bolt provided on the lower flange of the runway girder. 4. The runway girder support structure according to claim 3, wherein either the hole or the hole provided in the spring-out bracket is formed as a long hole extending in the material axis direction of the runway girder.   When installing a fulcrum member on the upper flange of the spring bracket as a support and restraining it by position shift prevention means or fall prevention means, if the flange width of the spring bracket is insufficient, the required flange width The runway girder support structure according to claim 1, wherein a rib plate having a diameter is added to widen the flange width to a required dimension.

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