JP2010150039A - Crane girder replacing method and crane girder replacing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively perform work for removing a fatigued crane girder to be removed after separating a girder connection part with a girder not to be removed, and work for subsequently placing the girder to be replaced to a section from which the girder is removed without securing a large space in a factory. <P>SOLUTION: This method includes: a process for arranging two sets of girder lifting and hanging devices 1 laterally movably just above longitudinal direction both ends of the girder W to be removed, and releasing a fastened state between a lower flange of the girder W to be removed and a receiving column V after connecting the girder W to be removed by a connection metal fitting of the girder lifting and hanging device 1; a process for vertically lifting the girder W to be removed by the girder lifting and hanging device 1 for the prescribed girder lifting margin (a); a process for laterally moving the girder W to be removed in a horizontal direction while lifting the girder W to be removed; and a process for hanging and lowering the girder W to be removed on the ground. After fixing the girder W to be removed on the prescribed position on the ground, the girder to be replaced is installed on the place from which the girder is removed by using the girder lifting and hanging device 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method and an apparatus capable of safely and efficiently exchanging a crane girder having a structure in which a girder connecting portion is received by a girder receiving column.

  Generally, overhead cranes are arranged in factories in order to lift heavy objects such as raw materials and machinery, and to transport the objects to a predetermined place. As such an overhead crane, it has a winch girder on which a winch (hoist) for lifting a conveyed product is mounted and this winch traverses, and a crane girder on which the winch girder is arranged. There are some which convey the conveyed product in the longitudinal direction (depth direction) of the factory by arranging it facing the predetermined height position of the wall surfaces on both sides. The crane girder is formed by processing a predetermined length of H-section steel having a predetermined strength and section modulus, connecting the H-section steels, and providing a rail. This type of crane girder (hereinafter also simply referred to as a girder) has a structure in which a girder connecting portion is received by a girder receiving column. In FIGS. 15A and 15B, V indicates a girder receiving column that receives the girder connecting portion between the removed girder W and the non-removed girder W '.

  When a crane girder having such a structure is used for a long period of time, minute fatigue cracks or the like due to traveling of the overhead crane may occur in the girder. For this reason, it is necessary to replace the girder, but after removing the girder connecting part with the non-removed girder W ', the work of removing the girder removed girder W and the work of installing the girder to be replaced at the removed position are efficient. It is hoped that

Conventionally, such crane girder replacement work has been performed using a crane vehicle 20 as shown in FIGS. 15 (a) and 15 (b).
On the other hand, Patent Document 1 discloses a method of lifting and lowering a girder using a scaffold arranged opposite to each other without using a crane vehicle 20 when an overhead crane is assembled or disassembled.

JP 2000-219484 A

However, when carrying out crane girder replacement work with a crane vehicle, it is necessary to secure a wide space in the factory to carry the crane vehicle, and lift and hold the girder with the cranes mounted on the two crane vehicles, There is a problem that it is necessary to perform the hanging work, and it is difficult to perform the work safely and efficiently while preventing the shake.
Moreover, the girder lifting / lowering method of patent document 1 arrange | positions a winding machine and a pulley at one end of the girder longitudinal direction, arrange | positions a pulley also to the upper part of both the opposing arrangement | positioning scaffolds, By connecting the wire from the hoisting machine to the other end in the direction, there was a problem that the girder could only be lifted and lowered between the oppositely arranged scaffolds, and the girder could not be moved laterally.

  The present invention eliminates the above-mentioned problems of the prior art and removes the girder removal girder after removing the girder connecting part with the non-removal girder without securing a large space in the factory, followed by removal. It is an object of the present invention to provide a method and an apparatus capable of safely and efficiently performing an operation of installing a girder to be replaced at a place where the replacement is performed.

As a result of intensive studies on the crane girder replacement work, the present inventor has constructed a horizontal upper work platform that has a predetermined height and is easy to assemble and disassemble, and suspended the girder on the upper work floor. -It has been found that the above problem can be solved if the suspension device is mounted so as to be laterally movable, and the first invention has been made based on this finding.
That is, the first invention is as follows.
(1) Crane girder replacement method having a structure in which the girder connecting portion is received by a girder receiving column, and two sets of girder lifting / suspending devices directly above both longitudinal ends of the removed girder sandwiched between non-removed girder A step of releasing the fastening between the lower flange of the removal girder and the receiving post after connecting the removal girder with the connecting bracket of the girder lifting / suspending device, A step of vertically lifting the removal girder by a lifting device with a lifting device, a step of moving horizontally while the removal girder is lifted, a step of hanging the girder to be removed and dropping it to the ground, The removal girder is fixed at a predetermined position on the ground, and then the girder is lifted at the place where the removal girder is subsequently removed. Crane girder replacement method characterized by mounting the girder to be replaced with a suspension device.
(2) A crane girder exchanging device having a structure in which a girder connecting portion is received by a girder receiving column, and having a connection fitting which is disposed immediately above one end in the longitudinal direction of the removal girder and detachably connects the removal girder Girder lifting / suspending device, fixed gantry to which the girder lifting / suspending device is detachably fixed, horizontal upper work floor gantry on which the fixed gantry can be horizontally moved, and upper work floor gantry A lower work floor support suspended from the upper work floor, and a column that is erected at a predetermined distance from the girder receiving column in order to support the anti-girder side of the upper work floor support at a predetermined height; A unit comprising a girder is also provided at the other end in the longitudinal direction of the removal girder, and two sets of girder lifting / suspending devices are connected to the control means in a cooperative manner. Crane girder exchange apparatus according to.
(3) The upper work floor platform is fixed so as to make a right angle to the laterally extending beams and the laterally extending beams arranged with a gap through which the lifting device of the girder lifting / suspending device passes. It consists of a main beam consisting of a girder longitudinally extending retaining beam, and the girder longitudinally extending retaining beam is extended to a non-removable girder adjacent to the removed girder, and becomes a non-removable girder via a girder lifting allowance securing member The crane girder exchanging apparatus according to (2), wherein the crane girder exchanging apparatus has a structure in which a fixed mount is placed on a laterally extending beam so as to be movable laterally.
(4) According to (2) or (3), the stretched side of the girder longitudinally extending holding beam is fastened to the non-removed girder by an anchor bolt via a girder lifting allowance securing member. The crane girder exchange device described.
(5) A height-adjusting screw-type jack for adjusting the height is disposed on the side opposite to the girder side of the laterally extending beam (2) to (4). The crane girder exchange device according to any one of the above.
(6) The lateral movement of the fixed base is configured to be performed by rolling of a plurality of rollers disposed between the fixed base beam and the laterally extending beam (2) to (5). The crane girder exchange device according to any one of the above.
(7) The lateral movement of the fixed base is driven by the lifting force of one chain of two chain blocks that are detachably mounted between the scaffolding for the girder lifting / suspending device and the handrail for the upper work floor. The crane girder exchanging device according to (6), wherein

Furthermore, as a result of intensive studies on the crane girder exchanging device of the first invention, the present inventor has found that it takes time to set up the preparatory work before the crane girder exchanging work, particularly the upper work floor platform at a predetermined height. In addition, it was found that a large space was required at the site where the crane girder replacement work was performed in order to assemble the upper work floor platform.
In particular, if it takes a lot of time to install the upper workbed platform to the specified height, it will hinder the traveling of the overhead crane, so it is necessary to quickly perform the preparation work to install the upper workbed platform to the specified height. was there. Therefore, various platforms are constructed in advance in places other than the crane girder replacement work, and the lower platform floor is suspended from the upper platform floor, and the girder lifting / suspending device is detachably fixed. The upper work floor platform, which has been assembled in various directions, can be expanded and contracted in multiple stages in a vertical direction. It has been found that the above problem can be solved by mounting the column in a state in which it can move laterally.

That is, the second invention is as follows.
(8) A crane girder exchanging device having a structure in which a girder connecting portion is received by a girder receiving column, wherein the upper work floor platform includes a laterally extending beam on which the fixed platform is horizontally movable, A main beam comprising a roller holding laterally extending beam arranged at a predetermined interval with respect to the direction extending beam, and a girder longitudinally extending holding beam fixed so as to be perpendicular to the laterally extending beam. The struts are extendable in a plurality of stages in the vertical direction, and are erected on the main body stand. Further, as the lateral movement mechanism of the upper work floor stand, the upper step of the beams parallel to the longitudinal direction of the girder A hand extension member fixed between the first beam and the second beam from the top and a rolling contact of a plurality of rollers with the hand extension member placed on the top, Move the hand-rolled member horizontally A first roller holding means fixed to the upper column of the beams parallel to the longitudinal direction of the girder and disposed on the second beam from the top, and a plurality of rollers rolling on the hand extension member The upper work floor pedestal is moved in the lateral direction by contact, among the main beams of the upper work floor pedestal, arranged at a plurality of positions in the lateral direction of the laterally extending beams positioned above the handrail member. The crane girder changing device according to (2), further comprising two roller holding means.
(9) The upper work floor platform includes a laterally extending beam arranged with a gap through which the lifting device of the girder lifting / suspending device passes, and the girder longitudinally extending holding beam adjacent to the removal girder The crane girder exchanging apparatus according to (8), wherein the crane girder exchanging apparatus has a structure that extends to the non-removable girder and is placed on the non-removable girder via a girder lifting allowance securing member.
(10) According to (8) or (9), the extended side of the girder longitudinally extending holding beam is fastened to the non-removed girder with an anchor bolt via a girder lifting allowance securing member. The crane girder exchange device described.
(11) A height-adjusting screw-type jack for adjusting the height is disposed on the side opposite to the girder side of the laterally extending beam (8) to (10). The crane girder exchange device according to any one of the above.
(12) The lateral movement of the fixed frame is configured to be performed by rolling of a plurality of rollers arranged between the beam for the fixed frame and the laterally extending beam (8) to (11). The crane girder exchange device according to any one of the above.
(13) The lateral movement of the fixed base is driven by the lifting force of one chain of two chain blocks that are detachably mounted between the scaffolding for the girder lifting / suspending device and the handrail for the upper work floor. (10) The crane girder exchanging device according to (12).
(14) The up / down lifting jack that alternately engages the upper engagement portion and the lower engagement portion in the engagement recesses provided at predetermined intervals of the climbing rod is used in the girder lifting / suspending device. The crane girder exchanging device according to any one of (8) to (13).

  In the first and second inventions, it is preferable that the following girder lifting / suspending devices are mounted on the upper work floor platform. For example, an up / down lifting jack composed of a main cylinder and a sub-cylinder used in the lift-up method described in Japanese Patent Application Laid-Open No. 55-68950, and a wire jack that winds and unwinds a PC steel wire using a hydraulic drive force An electric winch (winding machine) that drives the wire with an electric motor.

  The structure of the up-down lift jack is a structure in which a climbing rod (step rod 1a with a node, see FIG. 2) is provided at predetermined intervals by an expansion and contraction operation of a main cylinder and a main piston inserted in the main cylinder. The upper and lower engagement portions are alternately engaged with the joint recess so as to move up and down, and the engagement recess is formed in a semicircular cut over the entire circumference of the climbing rod and the upper portion. The lower engaging portion is connected to an engaging sphere engaged / disengaged in an engaging recess of the climbing rod and an auxiliary piston inserted in an auxiliary cylinder fitted to the climbing rod, and is engaged by an advance / retreat operation of the auxiliary piston. And a wedge member for engaging and disengaging the joint sphere with the engagement recess. This climbing rod has an appropriate length and can be lengthened by joining with a coupler, or it can be shortened by removing the coupler.

  According to the first and second inventions, without securing a large space in the factory, after disconnecting the girder connection part with the non-removed girder, the work to remove the fatigued removed girder, followed by replacement with the removed part The work to install the girder can be done safely and efficiently.

(A), (b) is a side view of the one end side unit of the crane girder exchange device of the first invention suitable for use in the method of the present invention. It is a side view which shows the connection release process with the removal girder in this invention method, and the fastening cancellation | release process with a girder receiving pillar. (A) is a side view showing the lifting and lateral movement steps of the removal girder in the method of the present invention, and (b) is an X3-X3 arrow view. It is a side view which shows the suspension process of the removal girder in this invention method. (A) is a side view showing a main beam of an upper work floor mount suitable for use in the method of the present invention, and (b) is a plan view. FIG. 2 is a cross-sectional view taken along the line X1-X1 in FIG. 1 (a) showing a support structure for the upper work floor mount according to the first invention. FIG. 2 is an X2-X2 arrow view of FIG. 1 (a) showing a support structure for the upper work floor mount of the first invention. It is a side view of the one end side unit of the crane girder exchange apparatus of the 2nd invention suitable for use in the method of the present invention. It is X4-X4 sectional drawing of FIG. It is a top view which shows the main beam and its horizontal movement mechanism of the base for upper work floors of 2nd invention. (A), (b) is sectional drawing which shows the structure of the support | pillar which expands-contracts in several steps in the up-down direction of FIG. 8, (c) is A arrow directional view of (b). It is a side view which shows the state in the middle of installation of the mount for upper work floors of 2nd invention. It is a side view which shows the state in the middle of installation of the mount for upper work floors of 2nd invention. It is a side view which shows the state in the middle of installation of the mount for upper work floors of 2nd invention. (A) and (b) are the side view and front view which show a conventional method.

  Hereinafter, the crane girder exchanging device of the first invention suitable for the method of the present invention and the method of the present invention will be described. FIGS. 1A and 1B are side views of a unit on one end side of a crane girder exchanging apparatus suitable for the method of the present invention. 2-4 is a side view which shows each process of the crane girder replacement | exchange work in this invention method. However, a similar unit is also arranged on the other end side of the removal girder W except for the operation panel 16 and the hydraulic unit 17 shown in FIGS.

In order to carry out the method of the present invention, prior to the crane girder exchanging work, a horizontal upper work floor platform 3 having a predetermined height and easy to assemble and disassemble is constructed, and this upper work floor is used. The girder lifting / suspending device 1 is mounted on the main beam of the gantry 3.
For this reason, the fixed base 2, the up / down lifting jack scaffold 2a, the upper work floor support 3, the upper work floor handrail 3a, the lower work floor support 4, and the lower work floor handrail 4a are respectively grounded. . Each part of the ground assembly consists of the up / down jacking scaffold 2a for the fixed base 2, the upper work floor handrail 3a for the upper work floor base 3, and the lower work floor handrail 4a for the lower work floor base. Assemble to 4.

Each part has two sets, one set constituting a unit on one end side of the removal girder W, and the other set constituting a unit on the other end side of the removal girder W.
Moreover, each part of the support | pillar 5 is also made into 2 sets, and is standingly arranged in two places equivalent to the longitudinal direction both ends of the removal girder W. That is, the longitudinal position where the column 5 is erected is a position facing the girder receiving column V that receives the girder connecting portion between the removed girder W and the non-removed girder W ′. The support column 5 is assembled with an elevating step by which the installer ascends and descends from the ground.

The upper work floor pedestal 3 is assembled with an elevating step for the operator to ascend and descend between it and the up-down elevating jack scaffold 2a, and similarly, an elevating step is assembled between it and the lower work floor pedestal 4.
In addition, a wheel is assembled to the lower end of the up / down lifting / lowering jack scaffold 2a, and the up / down lifting / lowering jack scaffold 2a is moved laterally by two manual chain blocks to be described later. A structure in which the fixed mount 2 is laterally moved together with the jack scaffold 2a is suitable. Each of these parts is easily disassembled by fastening a shape steel, a steel pipe or the like of an appropriate size with an appropriate fastening means (fastening bracket, bolt nut, etc.).

Here, as shown in FIGS. 1 and 2 to 4, the crane girder exchanging device according to the first aspect of the present invention is an upper working floor that can move the up / down lifting jack 1 laterally as a girder lifting / suspending device. The case where it mounts on the mount frame 3 is a suitable example.
A preferred crane girder exchanging device according to the first aspect of the present invention is an up / down lifting jack 1 which is disposed immediately above one end in the longitudinal direction of the removal girder W and has a connection fitting 1b for detachably connecting the removal girder W; For a fixed work stand 2 detachably fixed to a lifting jack 1, a horizontal work floor work stand 3 on which the fixed work stand 2 can be moved laterally, and a lower work floor suspended from the work work work stand 3. A unit comprising a gantry 4 and a column 5 erected at a predetermined distance from the girder receiving column V in order to support the anti-girder side of the upper work floor gantry 3 at a predetermined height, It is also provided at the other longitudinal end of the removal girder W, and two sets of up / down lifting jacks 1 are connected to an operation panel 16 and a hydraulic unit 17 as control means so as to be able to cooperate with each other.

  Therefore, the operation of lifting the removal girder W and the operation of suspending the removal girder W by the two sets of up / down lifting jacks 1 can be performed in synchronization with each other through the hydraulic unit 17 under the control of the operation panel 16. Moreover, since the up-down raising / lowering jack 1 is mounted on the horizontal upper work floor pedestal 3 so as to be laterally movable, it is possible to configure an apparatus that can easily perform the lateral movement of the removal girder W.

Next, a description will be given of a suitable apparatus structure that can easily perform the lateral movement of the removal girder W.
5 (a) and 5 (b) are a side view and a plan view showing the main beam of the upper work floor mount 3 suitable for use in the method of the present invention. 6 is a cross-sectional view taken along the line X1-X1 of FIG. 1 (a) showing the support structure of the upper work floor platform 3, and FIG. 7 is a view taken along the line X2-X2 of FIG. 1 (a).

  As shown in FIGS. 5 (a) and 5 (b), the upper work floor platform 3 is a laterally extended beam arranged with a gap b through which the stepped step rod 1a of the up / down lifting jack 1 passes. 6 and a girder longitudinally extending holding beam 7 fixed so as to make a right angle to the laterally extending beam 6. The girder longitudinally extending holding beam 7 is extended to the non-removed girder W ′ adjacent to the removed girder W, placed on the non-removed girder W ′ via the members 11 and 12 for securing the girder lifting allowance, and It is preferable that the directional overhanging beam 6 has a structure on which the fixed mount 2 is mounted so as to be laterally movable (see FIG. 6).

An appropriate sub beam is assembled to the main beam of the upper work floor mount 3 and a work floor is formed by attaching a steel plate such as a striped steel plate. An openable / closable window for descending to the lower work floor mount 4 is formed on the work floor of the upper work floor mount 3.
In addition, the stretched side of the girder longitudinally extending holding beam 7 is fastened to the non-removed girder W ′ with anchor bolts 13 via the girder lifting allowance securing members 11 and 12 (see FIG. 6), lateral direction A height-adjusting screw-type jack 8 that adjusts the height between the projecting beam 6 and the column 5 is preferably arranged on the side opposite the girder (see FIG. 7).

  In this way, when the crane girder replacement work is performed, the mass of the removal girder W is applied to the laterally extending beam 6 of the upper work floor gantry 3 from the fixed gantry 2 to which the up-down lifting jack 1 is fixed. The lifting allowance a can be secured by a predetermined value against the mass of the removal girder W. The lifting allowance a corresponds to the distance between the upper surface of the removal girder W and the lower surface of the upper work floor platform 3 in FIGS. The rail 15 on which the overhead crane runs is cut and removed in advance to a predetermined range of the non-removable girder W ′.

  By the way, H-shaped steel reinforced with ribs is used for the laterally extending beam 6 and the girder longitudinally extending holding beam 7 constituting the main beam of the upper work floor platform 3, depending on the mass of the removed girder W. Those having the following strength and cross-sectional dimensions are preferable because they can be easily selected. For the same reason, it is preferable to use H-shaped steel reinforced with ribs for the fixed base 2 and the members 11 and 12 for securing the girder lifting allowance.

  Furthermore, the lateral movement of the fixed base 2 is configured to be performed by rolling of a plurality of rollers 14 disposed between the fixed base beam and the laterally extending beam 6 (see FIGS. 6 and 7). The lateral movement of the fixed base 2 is driven by one chain of two manual chain blocks (not shown) detachably attached between the up / down lifting / lowering jack scaffold 2a and the upper work floor handrail 3a. It is preferable to carry out with a hoisting force of. In this way, the removal girder W can be moved laterally by performing the hoisting operation of one chain of the two chain blocks and the loosening operation of the other chain by the human power of the installer.

According to the crane girder exchanging apparatus described above, the removal girder W can be removed as shown in FIGS.
FIG. 2 is a side view showing a connection step with the removal girder W, a fastening release step with the girder receiving column V, and FIGS. 3A and 3B are side views showing the lifting and lateral movement steps of the removal girder W, FIG. 4A is a side view showing the suspending process of the removal girder W. FIG.

  In the method according to the present invention, two sets of up / down lifting jacks 1 are disposed so as to be laterally movable immediately above both longitudinal ends of the removal girder W, and each up / down lifting jack 1 penetrates a step rod 1a with a node. Installing. Next, the step of connecting the removal girder W with the connection fitting 1b of each up / down lifting / lowering jack 1, the fastening between the lower flange of the removal girder W and the receiving pillar V is released, and the removal girder W is removed with the up / down lifting / lowering jack 1 A process of lifting the girder W vertically by the predetermined lifting amount of the girder, a process of moving horizontally while lifting the removal girder W, and a process of hanging the removal girder W and lowering it to the ground. To settle. Next, install the girder to be replaced using the up / down lifting jack 1 at the removed location.

  Here, the work of tightening the bolt 9 and connecting the removal girder W with the connection fitting 1b and the work of releasing the fastening of the bolts / nuts 10a and 10b are performed by the installer while ensuring safety with the handrail 4a for the lower work floor. This is done manually (see FIG. 2). In addition, the operator can perform the operation of winding up one chain of the two chain blocks and loosening the other chain, and moving the removal girder W laterally while ensuring safety with the handrail 3a for the upper work floor. (See FIG. 3B).

  Also, when suspending the removal girder W, the installer on the ground operates the operation panel to temporarily stop the up / down lifting jack 1 and then the installer on the upper work floor platform 3 performs the upper work. The lifting step assembled to the floor pedestal 3 is raised, and the operation of joining the stepped step rod 1a with a coupler is performed manually while securing safety with the up / down lifting and lowering scaffold 2a (see FIG. 4 (b)). . In this way, the crane girder replacement work is performed while ensuring the safety of the installer.

Next, a crane girder exchanging apparatus according to the second invention that is suitable for use in the method of the present invention will be described.
FIG. 8 is a side view of one end side unit of the crane girder exchanging device of the second invention, and FIG. 9 is a cross-sectional view taken along the line X4-X4 of FIG. FIG. 10 is a plan view showing the installation state of the upper work floor mount 33 of the second invention and showing the main beams 6 and 7 of the upper work floor mount 33 and the lateral movement mechanism thereof.

  The crane girder exchanging device according to the second aspect of the present invention is composed of telescopic struts 26 and 27 in which the struts that support the side opposite the girder of the upper work floor platform 33 at a predetermined height are expanded and contracted in a plurality of stages in the vertical direction. An upper work floor pedestal 33 which is erected on the main body pedestal 29 and has been assembled to various pedestals is mounted on the telescopic support columns 26 and 27 so as to be movable in the lateral direction. A lateral movement mechanism for moving the upper work floor platform 33 in the lateral direction will be described later.

  The support column that supports the side of the upper work floor 33 opposite to the girder at a predetermined height includes an elevating means 30 that raises or lowers the adjacent upper support column 26 with respect to the lower support column 27, and the adjacent support columns 26, 27. There are fixing means 31 for locking the overlapping portions (see FIG. 8). In this case, as shown in FIG. 8, the elevating means 30 is an electric winch (winding machine) attached to the lower support column 27 so that the wire rope can be wound and unwound in two steps. The wire rope at one end is fixed to the upper column 25, and the wire rope at the other end is wound around the reel of the electric winch. The fixing means 31 that locks the overlapping portion of the adjacent columns 26 and 27 is a fixing pin 31, and a pin hole into which the fixing pin 31 is inserted is formed at a predetermined position of the columns 26 and 27.

In FIG. 8, 28 indicates a lower beam fixed to the lower column 27, and 25 indicates an upper beam fixed to the upper column 26. The lower column 27 to which the lower beam 28 is fixed is a U-shaped steel, and the upper column 26 to which the upper beam 25 is fixed is an H-shaped steel.
The upper column 26 made of this H-shaped steel has a structure that moves up and down while being guided by the lower column 27 (see FIG. 11A). 11A and 11B show the Y1-Y1 cross section and the Y2-Y2 cross section of FIG. 8, and FIG. 11C shows the A arrow view of FIG. 11B. .

  Further, as shown in FIG. 10, the main beam of the upper work floor mount 33 is a laterally extending beam 6 arranged with a gap b through which the lifting tool 1a of the girder lifting / suspending device 1 passes. Roller holding laterally extending beams 6a arranged at a predetermined interval with respect to the laterally extending beam 6, and girder longitudinally extending and retaining beams 7 fixed so as to be perpendicular to the laterally extending beams 6 and 6a. It consists of.

Here, the lateral movement mechanism for laterally moving the upper work floor platform 33 after assembling the various platforms includes the hand extension member 21, the first roller holding means 22 and the second roller holding means 23 ( (See FIGS. 8, 9, and 10).
The hand extension member 21 is fixed to the upper column among the beams parallel to the longitudinal direction of the girder and is arranged between the first beam and the second beam from the top, and the girder side tip is removed from the girder W. And over the adjacent non-removed girder W ′ (see FIGS. 8 and 9). The first roller holding means 22 moves the hand extending member 21 in the lateral direction by the rolling contact of a plurality of rollers with the hand extending member 21 placed on the upper part of the beams parallel to the longitudinal direction of the girder. And is arranged on the second beam 25 from the top (see FIGS. 9 and 10).

  The second roller holding means 23 moves the upper work floor pedestal 33 in the lateral direction by rolling contact of a plurality of rollers on the hand-stretching member 21. It is arranged at a plurality of positions in the horizontal direction of the holding laterally extending beam 6a (see FIGS. 9 and 10). In this case, as shown in FIG. 10, there are three places in the horizontal direction where the second roller holding means 23 are arranged, between the girder side front end and the counter girder side rear end, and each second roller holding means. 23 is suspended below the laterally extending beams 6 and 6a via the suspension means 24.

When the upper work floor mount 33 is used, the first roller holding means 22 fixed on the upper column and disposed on the second beam 25 from above, and the laterally extending beams 6 and 6a In this structure, the hand extension member 21 is clamped by the second roller holding means 23 suspended by the suspension means 24 below a plurality of locations in the direction (see FIG. 9).
As the first roller holding means 22 and the second roller holding means 23 for moving the above-mentioned hand extension member 21 or the upper work floor platform 33 in the lateral direction by the rolling contact of a plurality of rollers, there are known commercially available ones. It is preferable that the roller, that is, the plurality of rollers revolve around the cage while rotating.

By the way, when the removal girder W is removed, the upper work floor platform 33 is fixed to the non-removal girder W ′ with the anchor bolts 13 via the girder lifting allowance securing members 11 and 12 (FIG. 9).
Further, when the removal girder W is removed, in FIG. 9, the connecting portion of the right hand extension member 21 and the removal girder W by the fixing bolt is released by loosening the fixing bolt, while in FIG. The connection between the left hand extension member 21 and the non-removed girder W ′ is kept connected with a fixing bolt. Then, the hanger 1a of the girder lifting / suspending device 1 and the removal girder W are coupled via the connection fitting 1b (see FIGS. 8 and 2).

The operation and effect of mounting the upper work floor platform 33, on which the assembly of the various platforms has been completed, on the telescopic support column in a state in which it can be laterally moved is as shown in FIGS.
FIG. 12 shows a state in which the upper work floor support 33 is placed on the main body support 29 in a contracted state of the support column, and FIG. 13 shows a state in which the hand extension member 21 is moved laterally after the support column extension in the contracted state. FIG. 14 shows a state when the upper work floor platform 33 is moved laterally.

  In the contracted state of the column shown in FIG. 12, the height of the girder lifting / suspending device 1 itself mounted on the upper work floor mount 33 is lower than the girder height, so that the overhead crane can be operated. Has an effect. Thereafter, the contracted column is extended, and the hand extension member 21 is moved in the lateral direction. The hand extension member 21 is placed on the first roller holding means 22 and is clamped by the second roller holding means 23 that supports the upper work floor platform 33 (see FIGS. 8 and 9). Therefore, the lateral movement of the extension member 21 receiving the weight of the upper work floor mount 33 on which various mounts are assembled and the heavy girder lifting / suspending device 1 (up / down lifting type jack etc.) is mounted, It is possible to carry out safely and quickly manually using a chain block. Before moving the hand extension member 21 in the horizontal direction, use the chain block that pulls the operation chain by hand, and place the fixed stand 2 in a laid-down state with the girder lifting and suspending device 1 detachably fixed. (See FIG. 13). After the manual movement of the hand extension member 21 is continued using a chain block, the tip of the girder side of the hand extension member 21 and the removal girder W and the adjacent non-removal girder W ′ are fixed with a fixing bolt or the like. Link. The connecting portion such as the fixing bolt is tightened so that the connection can be released by loosening the bolt. After tightening the extension member 21, the removed girder W and the adjacent non-removed girder W 'so that the connection can be released with a fixing bolt or the like, the upper work floor platform 33 is moved laterally (see FIG. 14).

  The lateral movement of the upper work floor platform 33 is carried out by connecting the leading end of the girder to the removal girder W and the adjacent non-removal girder W ′ with a fixing bolt or the like via the second roller holding means 23. This is done by moving on the member 21. At this time, the lateral movement of the upper work floor platform 33 is preferably performed using an appropriate hydraulic cylinder because it can be performed safely and quickly.

  According to the crane girder exchanging device of the second invention, the upper work floor pedestal 33 is installed at a predetermined height after the upper work floor pedestal 33 described above is being installed. This can be done quickly so as not to cause any trouble. The crane girder exchanging device according to the second invention is such that the upper work floor platform, which has been assembled with various platforms, is mounted in a horizontally movable state on a telescopic column that expands and contracts in multiple stages in the vertical direction. It is preferable that the crane girder exchanging device of the first invention is used.

  The upper work floor mount 3 is constructed at a height of 20 m from the ground, and the up / down lifting jack 1 mounted on the upper work floor mount 3 is used. The girder height is 2 m, the girder length is 15 m, The work which removed the fatigued removal girder W whose mass is as much as 50 tons, and the work which installs the girder to replace | exchange to the removed part were performed after that. At this time, the lateral length of the laterally extending beam (main beam) 6 of the upper work floor platform 3 is 4100 mm, and the girder longitudinal direction of the girder longitudinally extending holding beam (main beam) 7 fixed so as to be perpendicular thereto. The upper work floor gantry 3 was configured with the length of the extension to 1500 mm and the height of the girders lifting allowance securing members 11 and 12 set to the lifting allowance a = 350 mm (FIGS. 1, 5, 6, and 6). 7).

  As a result, when the crane girder replacement work is performed with a crane truck as in the conventional method, a large space for carrying the crane truck has to be secured in the factory, and in a factory that was difficult to realize, the fatigued removal girder It was possible to safely and efficiently perform the work of removing W and the work of installing the girder to be replaced at the removed place (see FIGS. 2 to 4).

The upper work floor mount 33 is constructed at a height of about 12m above the ground, and the up / down lifting jack 1 mounted on the upper work floor mount 33 is used. The girder height is 2m and the girder length is 15m. Then, the work of removing the fatigued removed girder W having a mass of 50 tons was performed, and the work of installing the girder to be replaced at the removed place was performed.
At that time, the horizontal length of the upper work floor pedestal 3 (the length of the laterally extended beam (main beam) 6) is 6000 mm, and the vertical length of the upper work floor pedestal 3 perpendicular to the upper work floor pedestal 3 (girder longitudinal extension). The upper surface of the laterally extending beam (main beam) 6 of the upper work floor support 33 that is supported by the reduced support column and is erected on the main body support 29. The length of the holding beam (main beam) 7 is 2000 mm. The height up to 8300 mm was set to 12,500 mm in the extended state (see FIGS. 8 to 12).

  Further, the upper work floor platform 3 was configured with the height of the members 11 and 12 for securing the girder lifting allowance being 350 mm. As a result, when the crane girder replacement work is performed with a crane truck as in the conventional method, a large space for carrying the crane truck has to be secured in the factory, and in a factory that was difficult to realize, the fatigued removal girder We were able to safely and efficiently carry out the work of removing W and then installing the girder to be replaced at the place of removal.

W Detachable girder W 'Non-removable girder V Girder support column a Lifting allowance b Clearance 1 Girder lifting / suspending device (up / down lifting jack)
1a Step rod with nodes (hanging tool)
1b Connecting bracket 2 Fixed base
2a Scaffolding for up-down lifting jack 3 Upper work floor platform
3a Handrail for upper work floor 4 Base for lower work floor
4a Handrail for lower work floor 5 Post 6 Lateral overhanging beam (main beam)
7 Girder Longitudinal Stretched Retaining Beam (Main Beam)
8 Screw jack for height adjustment 9 Bolt
10a, 10b Bolt / Nut
11, 12 Materials for securing the girder lifting allowance
13 Anchor bolt
Around 14
15 rails
16 Control panel
17 Hydraulic unit
20 crane truck
21 Handrail
22 First roller holding means
23 Second roller holding means
24 Hanging means
25a, 25b Beam parallel to girder longitudinal direction
26 Upper strut
27 Lower strut
28 Lower beam
29 Main frame
30 Lifting means (winches, etc.)
31 Fixing means (fixing pin)
32 Connecting means (bolts and nuts)
33 Upper work floor mount

Claims (14)

  This is a crane girder replacement method that has a structure in which the girder connection part is received by a girder support post, and two sets of girder lifting and suspending devices are moved horizontally just above the longitudinal ends of the removed girder sandwiched between non-removed girder A step of releasing the fastening between the lower flange of the removal girder and the receiving post after connecting the removal girder with the connecting bracket of the girder lifting / suspending device, and the girder lifting / suspending device The removal girder includes a step of lifting the removal girder vertically by a predetermined girder lifting allowance, a step of moving horizontally while the removal girder is lifted, and a step of hanging the girder to be removed and dropping it to the ground. Is fixed at a predetermined position on the ground, and then the girder is lifted / suspended at the place where it is removed. Crane girder replacement method characterized by mounting the girder to be replaced using the following apparatus.   A crane girder exchanging device having a structure in which a girder connecting portion is received by a girder receiving column, and arranged at a position directly above one end in the longitudinal direction of the removal girder and having a connection fitting for detachably connecting the removal girder. A suspension device, a fixed base on which the girder lifting / suspending device is detachably fixed, a horizontal upper work floor base on which the fixed base is movably mounted, and a suspension on the upper work floor base A lower work floor pedestal, and a support column erected at a predetermined distance from the girder receiving column in order to support the anti-girder side of the upper work floor pedestal at a predetermined height. A unit is also provided at the other longitudinal end of the removal girder, and two sets of girder lifting / suspending devices are connected to the control means so as to cooperate with each other. Crane girder exchange apparatus.   The upper work floor platform includes a laterally extending beam arranged with a gap through which the lifting device of the girder lifting / suspending device passes, and a girder longitudinal direction fixed so as to be perpendicular to the laterally extending beam. The girder longitudinally extending holding beam is extended to a non-removing girder adjacent to the removal girder and placed on the non-removing girder via a girder lifting allowance securing member. 3. The crane girder exchanging apparatus according to claim 2, wherein the fixed support is mounted on the laterally extending beam so as to be laterally movable.   4. The crane girder replacement according to claim 2, wherein an extended side of the girder longitudinally extending holding beam is fastened to the non-removed girder with an anchor bolt via a girder lifting allowance securing member. apparatus.   The height-adjusting screw-type jack for adjusting the height is disposed between the post and the support on the side opposite the girder side of the laterally extending beam. The crane girder exchange device described in 1.   The lateral movement of the fixed gantry is configured to be performed by rolling of a plurality of rollers arranged between the beam for the stationary gantry and the laterally extending beam. The crane girder exchange device described in 1.   The lateral movement of the fixed base is driven by the lifting force of one chain of two chain blocks that are detachably attached between the scaffolding for the girder lifting / suspending device and the handrail for the upper work floor. The crane girder changing apparatus according to claim 6.   The upper work floor platform includes a laterally projecting beam on which the fixed platform is movably mounted, a roller retaining laterally projecting beam arranged at a predetermined interval with respect to the laterally projecting beam, It has a main beam consisting of a girder longitudinally extending holding beam fixed so as to make a right angle to the direction extending beam, and the column is extendable in a plurality of stages in the vertical direction and is erected on the main frame. Further, as a lateral movement mechanism of the upper work floor platform, the beam is fixed to the upper column among the beams parallel to the longitudinal direction of the girder and is arranged between the first beam and the second beam from the top. Fixed to the upper strut of the beam parallel to the longitudinal direction of the girder, which moves the handbill member laterally by rolling contact of a plurality of rollers with the handbill member placed on top. On top of the second beam from the top The upper work floor gantry main beam of the upper work floor gantry that moves the upper work floor gantry laterally by rolling contact of a plurality of rollers over the first roller holding means and the hand extending member. The crane girder exchanging apparatus according to claim 2, further comprising second roller holding means arranged at a plurality of positions in the lateral direction of the laterally extending beam positioned above the extending member.   The upper work floor platform includes a laterally extending beam arranged with a gap through which the lifting device of the girder lifting / suspending device passes, and the girder longitudinally extending holding beam is non-removed adjacent to the removed girder The crane girder exchanging apparatus according to claim 8, wherein the crane girder exchanging apparatus has a structure that extends onto the girder and is placed on a non-removable girder through a girder lifting allowance securing member.   The crane girder replacement according to claim 8 or 9, wherein the extended side of the girder longitudinally extending holding beam is fastened to the non-removable girder with an anchor bolt via a girder lifting allowance securing member. apparatus.   The height-adjusting screw-type jack for adjusting the height is disposed between the post and the support column on the side opposite the girder side of the laterally extending beam. The crane girder exchange device described in 1.   The crane girder according to any one of claims 8 to 11, wherein the lateral movement of the fixed frame is configured to be performed by rolling of a plurality of rollers disposed between the beam for the fixed frame and the laterally extending beam. Exchange equipment.   The lateral movement of the fixed base is driven by the lifting force of one chain of two chain blocks that are detachably attached between the scaffolding for the girder lifting / suspending device and the handrail for the upper work floor. The crane girder exchanging apparatus according to claim 12. The girder lifting / suspending device uses an up / down lifting jack in which an upper engaging portion and a lower engaging portion are alternately engaged in engagement recesses provided at predetermined intervals of a climbing rod. The crane girder exchange device according to any one of claims 8 to 13.

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