CN218025017U - Crane beam structure after old factory building lengthening and transformation - Google Patents

Abstract

The utility model relates to a crane beam structure after old factory building extension is reformed transform relates to the technical field of hoist device, and it includes the hanging beam body, still includes the extension roof beam, the hanging beam body is laid along same straight line with the extension roof beam, the one end that the hanging beam body is close to the extension roof beam is fixed with the spacing piece, the spacing groove has been seted up to one side that the extension roof beam is close to the hanging beam body, the stopper activity insert the spacing inslot and with spacing groove joint adaptation, still be equipped with between extension roof beam and the hanging beam body and be used for making the stopper stably be located the coupling assembling of spacing inslot. This application has the crane of being convenient for and normally carries the article in the factory building after lengthening, reduces the effect of technical staff's the amount of labour.

Description

Crane beam structure after old factory building extension transformation

Technical Field

The utility model belongs to the technical field of the technique of hoist device and specifically relates to a crane beam structure after old factory building extension is reformed transform.

Background

The crane beams are beam structures for supporting the bridge crane to operate, the crane beams generally appear in pairs, a crane track is arranged between the two crane beams in a sliding mode, and the crane travels back and forth on the crane beams through the crane track to carry objects.

At present the factory building when laying the crane beam, the technician at first can be according to the length customization crane beam's of factory building length, then with the crane beam of customization well fixed mutually with a plurality of support columns of crane beam and factory building through the mode of strengthening anchor bar and crab-bolt, then with crane rail slide set up in crane beam's top.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: after lengthening and transforming old houses, the crane beam with the fixed length limits the movement distance of a crane, so that the lifting distance of the crane is limited, a technician is required to carry out secondary carrying through a forklift, and the operation is inconvenient.

SUMMERY OF THE UTILITY MODEL

In order to facilitate the crane to carry normally the article in the factory building behind the extension, reduce technical staff's the amount of labour, this application provides a crane beam structure behind old factory building extension transformation.

The application provides a crane beam structure after old factory building extension is reformed transform adopts following technical scheme:

the utility model provides a crane beam structure after old factory building extension is reformed transform, includes the hanging beam body, still includes the extension roof beam, the hanging beam body is laid along same straight line with the extension roof beam, the one end that the hanging beam body is close to the extension roof beam is fixed with the spacing piece, the spacing groove has been seted up to one side that the extension roof beam is close to the hanging beam body, the spacing inslot and with spacing groove joint adaptation are inserted in the stopper activity, still be equipped with between extension roof beam and the hanging beam body and be used for making the stopper stably be located the coupling assembling of spacing inslot.

By adopting the technical scheme, after a factory building is lengthened and transformed, a technician moves the extension beam to the position near the hanging beam body, the extension beam and the hanging beam body are pre-fixed by clamping the limiting block on the hanging beam body in the limiting groove on the extension beam, and then the limiting block is stably positioned in the limiting groove through the connecting assembly, so that the stable connection between the hanging beam body and the extension beam is realized, the carrying distance of a crane is further increased, the carrying workload of the technician and a manual forklift is reduced, the workload of the technician is reduced, and the working efficiency of the technician is improved; and the limiting blocks and the limiting grooves are clamped and matched, so that the shearing resistance force between the hanging beam body and the extension beam is provided, and the stable bearing of the crane track is realized.

Optionally, coupling assembling includes the fixing base and is used for making the fixing base and the equal stable connecting's of hanging beam body, extension beam connecting piece, the fixed slot has been seted up on the fixing base, the fixed slot is the opening form along hanging beam body length direction's both ends, just the hanging beam body all stretches into in the fixed slot with the one end that the extension beam is close to each other, just the hanging beam body with the distolateral laminating that the extension beam is close to each other.

By adopting the technical scheme, after a technician clamps the limiting block on the hanging beam body into the limiting groove on the extension beam, the technician coats the fixed seat on the outer sides of the hanging beam body and the extension beam, and realizes stable connection among the hanging beam body, the extension beam and the fixed seat through the connecting piece; and the fixing base through setting up carries out the bearing to hanging beam body and extension beam, further promotes the stability of hanging beam body and extension beam junction, and the distolateral activity laminating that hanging beam body and extension beam are close to each other reduces the gap of junction, rocks when reducing the crane rail motion, promotes the stability of crane rail when sliding to security when promoting the handling.

Optionally, the connecting piece includes the locating piece, the locating piece is equipped with two sets ofly, and is two sets of the locating piece is all fixed locate on the interior diapire of fixed slot and be located the both ends of fixing base, and a set of locating piece runs through the diapire of hanging beam body, another set of the locating piece runs through the diapire of extension roof beam.

Through adopting above-mentioned technical scheme, the technical staff will hang the roof beam body on the spacing piece joint go into the spacing groove on the extension roof beam after, the technical staff will fix the base cladding in the outside of hanging the roof beam body and extension roof beam, make the locating piece that is close to the hanging the roof beam body run through the hanging the roof beam body, make the locating piece that is close to the extension roof beam run through the extension roof beam, make the difficult motion of taking place relative the keeping away from of hanging the roof beam body with the extension roof beam to make the spacing piece on the hanging the roof beam body stably be located the spacing groove of extension roof beam, realize hanging the roof beam body and be connected with the stability of extension roof beam.

Optionally, the locating piece is provided with a fixing hole, the fixing hole is internally provided with a fixing bolt in a threaded manner, the free end of the fixing bolt sequentially penetrates through the fixing holes in the two locating pieces on the same side of the fixing seat along the length direction of the hanging beam body, the fixing bolt is matched with the thread of the inner side wall of the fixing hole, the free end of the fixing bolt is provided with a fixing nut in a threaded manner, and the fixing nut is tightly abutted to the side wall of the locating piece.

Through adopting above-mentioned technical scheme, when hanging beam body and extension roof beam all install on the fixing base, fixing bolt is inserted in the fixed orifices on two locating pieces of technical staff hanging beam body with one side to through rotatory fixation nut until fixation nut offsets tightly with the lateral wall of locating piece, further make hanging beam body with difficult and the fixing base phase separation, the extension roof beam is difficult with the fixing base phase separation, thereby realizes hanging beam body, fixing base, the stable of extension roof beam and is connected.

Optionally, coupling assembling includes the connecting sleeve, the distolateral that hanging beam body and extension beam are close to each other all stretches into in the connecting sleeve, just the internal perisporium of connecting sleeve with the outer peripheral wall laminating mutually of hanging beam body, extension beam, the connecting sleeve all is fixed with the supporting shoe along two relative inside walls of hanging beam body length direction, the supporting shoe with the outer side laminating mutually of hanging beam body, the supporting shoe with the outer side laminating mutually of extension beam, still be equipped with the locking piece that is used for making connecting sleeve, hanging beam body and extension beam stable connection on the connecting sleeve.

By adopting the technical scheme, when the crane beam body needs to be lengthened, a technician inserts the mutually close ends of the crane beam body and the extension beam into the connecting sleeve, so that the inner peripheral wall of the connecting sleeve is attached to the crane beam body and the extension beam, the crane beam body and the connecting sleeve are positioned, and the crane beam body and the extension beam are conveniently clamped and matched by the technician; the stable connection of the hanging beam body, the connecting sleeve and the extension beam is realized through the locking piece, and the supporting block on the inner peripheral side of the connecting sleeve supports the hanging beam body and the extension beam; through stopper and supporting shoe, promote the anti-shear force of hanging beam body and extension beam junction to stability when promoting hanging beam body and extension beam and being connected.

Optionally, the locking piece includes a locking block, first locking grooves have been all seted up to connecting sleeve's both ends side, the second locking groove has all been seted up to the distolateral side that hanging beam body and extension beam are close to each other, just first locking groove is linked together with distolateral side that second locking groove is close to each other, just first locking groove is narrower than the opening width of keeping away from one side mutually with the opening that second locking groove is close to one side mutually, locking block and first locking groove, the equal interference fit in second locking groove.

By adopting the technical scheme, after a technician sleeves the connecting sleeve on the hanging beam body and the extension beam, the technician fits one end of the locking block into the first locking groove of the connecting sleeve close to the hanging beam body in an interference fit manner, and fits the other end of the locking block into the second locking groove of the hanging beam body close to the connecting sleeve in an interference fit manner, because the width of the opening at the side close to the connecting sleeve is narrower than that of the opening at the side far away from the connecting sleeve, when the locking block is clamped in the first locking groove and the second locking groove, the connecting sleeve and the hanging beam body are not easy to move far away from each other, so that the connecting sleeve and the hanging beam body are stably connected; in the same way, the connecting sleeve and the extension beam are fixed through the locking block, and the stable connection of the connecting sleeve, the extension beam and the hanging beam body can be realized.

Optionally, a first limiting hole is formed in the side wall of the connecting sleeve, the first limiting hole penetrates through the supporting block to be arranged, second limiting holes are formed in the hanging beam body and the extension beam, the first limiting hole corresponds to the second limiting hole in a one-to-one mode, a limiting bolt is further arranged on the connecting sleeve, the free end of the limiting bolt penetrates through the first limiting hole and the second limiting hole in sequence, a limiting nut is assembled on the free end of the limiting bolt through threads, and the limiting nut abuts against the side wall of the connecting sleeve.

Through adopting above-mentioned technical scheme, the technical staff passes through connecting sleeve with the hanging beam body with the extension roof beam after being connected, runs through first spacing hole and the spacing hole of second with spacing bolt in proper order, further promotes connecting sleeve and this body coupling's of hanging beam stability, and then promotes the stability when prolonging back, crane motion to the hanging beam.

Optionally, the limiting bolt is provided with a reinforcing member for reducing looseness of the limiting nut.

Through adopting above-mentioned technical scheme, the reinforcement that sets up reduces stop nut's not hard up to promote spacing bolt to the reinforced stability of hanging beam body, connecting sleeve.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the hanging beam body and the extension beam are pre-fixed when being spliced through the limiting blocks and the limiting grooves, and the limiting blocks provide anti-shearing force for the joint of the hanging beam body and the extension beam, so that the connection stability of the hanging beam body and the extension beam is improved;

2. the hanging beam body and the extension beam are not easy to be far away from each other when being spliced through the arranged fixed seat and the limiting block, so that the hanging beam body and the extension beam are stably connected;

3. the limiting blocks are abutted tightly through the arranged fixing bolts, and the stability of connection of the hanging beam body and the extension beam is further improved.

Drawings

Fig. 1 is a schematic overall structure diagram of a crane beam structure after an old factory building is lengthened and modified according to embodiment 1 of the present application;

FIG. 2 is a schematic view of the connection structure of the hanging beam body, the extension beam and the connection assembly in FIG. 1;

fig. 3 is a schematic view of a connection structure of the suspension beam body, the extension beam, and the connection assembly in embodiment 2 of the present application.

Reference numerals are as follows: 1. a hanging beam body; 11. a limiting block; 12. a support column; 13. positioning holes; 2. extending the beam; 21. a limiting groove; 3. a connection assembly; 31. a fixed seat; 311. fixing grooves; 32. a connecting member; 321. positioning blocks; 322. a fixing hole; 323. fixing the bolt; 324. fixing a nut; 33. a connecting sleeve; 34. a support block; 35. a locking member; 351. a locking block; 352. a first locking groove; 353. a second locking groove; 41. a first limit hole; 42. a second limiting hole; 43. a reinforcement; 431. reinforcing the nut; 44. a limit nut; 45. and a limiting bolt.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses crane beam structure after old factory building extension is reformed transform.

Example 1

Referring to fig. 1, the crane beam structure after the extension modification of the old factory building comprises a crane beam body 1 and an extension beam 2 which is arranged along the same straight line with the crane beam body 1, wherein the crane beam body 1 and the extension beam 2 are both made of I-shaped steel belts; the gliding slide rail of confession crane track is all seted up to the upper surface of hanging beam body 1 and extension beam 2, hanging beam body 1 all through bolt riveting fixation in the support column 12 of factory building on and the level is laid all, hanging beam body 1 is close to the one end fixedly connected with stopper 11 of extension beam 2, extension beam 2 is close to the one end of hanging beam body 1 and has seted up spacing groove 21, stopper 11 and the 21 joint adaptation of spacing groove, and still be equipped with between extension beam 2 and the hanging beam body 1 and be used for making stopper 11 stably be located coupling assembling 3 of spacing groove 21.

Referring to fig. 2, the connection assembly 3 includes a fixing seat 31, a fixing groove 311 is provided on the fixing seat 31, and both ends of the fixing groove 311 along the length direction of the hanging beam body 1 are in an open shape, one end of the hanging beam body 1 close to the extension beam 2 is movably inserted into the fixing groove 311, one end of the extension beam 2 close to the hanging beam body 1 is also movably inserted into the fixing groove 311, and the outer peripheral sides of the hanging beam body 1 and the extension beam 2 are movably attached to the inner side wall of the fixing groove 311, and in order to improve the stability of the splicing part of the hanging beam body 1 and the extension beam 2, the bottom of the fixing seat 31 is fixed to the support column 12 in the factory building.

Referring to fig. 2, the connecting assembly 3 further includes a plurality of positioning blocks 321, the positioning blocks 321 are fixed on the inner bottom wall of the fixing groove 311, the plurality of positioning blocks 321 are divided into two groups along the length direction of the hanging beam body 1, and the two groups of positioning blocks 321 are respectively disposed at two opposite ends of the fixing groove 311, in this embodiment, one group of positioning blocks 321 includes two positioning blocks 321 relatively distributed at two sides of the hanging beam body 1 along the width direction of the hanging beam body 1, in other embodiments, one group of positioning blocks 321 may also be four, six, eight, and the like, and the arrangement manner is the same as that in this embodiment; the bottom side of the hanging beam body 1 is provided with a positioning hole 13, the bottom side of the extension beam 2 is also provided with a positioning hole 13, one end of the positioning block 321 penetrates through the positioning hole 13, and the outer peripheral side of the positioning block 321 is attached to the inner side wall of the positioning hole 13.

Referring to fig. 2, in order to further improve the stability of connecting the extension beam 2 and the hanging beam body 1, the connecting assembly 3 further includes a connecting member 32, in this embodiment, the connecting member 32 is a fixing bolt 323, a fixing hole 322 is formed in one end of the positioning block 321 penetrating through the positioning hole 13, the fixing holes 322 on the two positioning blocks 321 corresponding to each other along the length direction of the hanging beam body 1 correspond to each other, a free end of the fixing bolt 323 sequentially penetrates through the two fixing holes 322 and is threadedly assembled with a fixing nut 324, the arrangement direction of the fixing bolt 323 is consistent with the length direction of the hanging beam body 1, and the fixing bolt 323 is in threaded fit with the inner side wall of the fixing hole 322.

In embodiment 1 of the application, the implementation principle of the crane beam structure after the extension and transformation of the old factory building is as follows: a technician splices the extension beam 2 with the hanging beam body 1 to enable the limiting block 11 to be clamped in the limiting groove 21, then the technician wraps the outer side of the splicing position of the fixing seat 31 and the hanging beam body 1 with the extension beam 2 to enable the splicing position of the hanging beam body 1 with the extension beam 2 to be positioned in the fixing groove 311 on the fixing seat 31, and simultaneously, one group of positioning blocks 321 in the fixing groove 311 penetrates through the positioning holes 13 of the hanging beam body 1, and the other group of positioning blocks 321 in the fixing groove 311 penetrates through the positioning holes 13 on the extension beam 2 to achieve splicing; then, the technician screws the fixing bolts 323 into the fixing holes 322 of the two corresponding positioning blocks 321 on the same side along the length direction of the hanging beam body 1 until the large head ends of the fixing bolts 323 abut against the side walls of the positioning blocks 321, and finally, the technician screws the fixing nuts 324 into the free ends of the fixing bolts 323 until the fixing nuts 324 abut against the side walls of the other positioning blocks 321.

Example 2

Referring to fig. 3, a difference between embodiment 2 and embodiment 1 of the present application is that the connection assembly 3 includes a connection sleeve 33, the connection sleeve 33 is hollow and is adapted to the end surface shape of the hanging beam body 1, the end sides of the hanging beam body 1 and the extension beam 2 close to each other are both movably inserted into the connection sleeve 33, support blocks 34 are fixedly connected to two opposite inner side walls of the connection sleeve 33, and the support blocks 34 are attached to the inner side walls of the recessed portions of the hanging beam body 1 and the extension beam 2.

And in order to further fix the splicing position of the hanging beam body 1 and the extension beam 2, the connecting assembly 3 further comprises a locking piece 35, in this embodiment, the locking piece 35 is a locking block 351, first locking grooves 352 are respectively formed in two end sides of the upper portion of the connecting sleeve 33, second locking grooves 353 are respectively formed in two end sides of the hanging beam body 1 and the extension beam 2 inserted into the connecting sleeve 33, the first locking grooves 352 correspond to the second locking grooves 353 in a one-to-one manner and are communicated with each other, openings of the first locking grooves 352 and the second locking grooves 353 close to each other are respectively narrower than the opening width far away from each other, when the first locking grooves 352 and the second locking grooves 353 are communicated, the locking block 351 is inserted into the first locking grooves 352 and the second locking grooves 353 and is in interference fit with the first locking grooves 352 and the second locking grooves 353.

Referring to fig. 3, a first limiting hole 41 is formed in two opposite side walls of the connecting sleeve 33, the first limiting hole 41 is provided with two ends which are respectively located at the two ends of the connecting sleeve 33, a second limiting hole 42 is formed in the end side of the hanging beam body 1 extending into the connecting sleeve 33, one end of the extension beam 2 extending into the connecting sleeve 33 is provided with a limiting hole, the first limiting hole 41 corresponds to the second limiting hole 42 one by one, a limiting bolt 45 is assembled in the first limiting hole 41, the limiting bolt 45 sequentially penetrates through the first limiting hole 41 and the second limiting hole 42, a limiting nut 44 is assembled in the free end of the limiting bolt 45, and the limiting nut 44 is movably abutted against the outer side wall of the connecting sleeve 33.

In order to reduce looseness of the limiting bolt 45 caused by vibration of the hanging beam body 1 when the crane track runs, the limiting bolt 45 is further provided with a reinforcing piece 43, the reinforcing piece 43 comprises a reinforcing bolt, two sections of external threads with opposite threads are formed in the free end of the limiting bolt 45, two-way threads are formed in the inner peripheral sides of the limiting nut 44 and the reinforcing nut 431, the limiting nut 44 and the reinforcing nut 431 are in threaded fit with the limiting bolt 45, and the reinforcing nut 431 is assembled at the boundary of the two sections of threads in a threaded mode and abuts against the limiting nut 44; when a crane runs and the hanging beam body 1 vibrates, the limiting nut 44 vibrates and is easy to rotate to loosen, external threads with opposite threads at two ends are formed, the reinforcing nut 431 is assembled at the boundary part in a threaded mode, the reinforcing nut 431 is tightly abutted when the limiting nut 44 rotates, the reinforcing nut 431 also has a tendency of rotating, and the reinforcing nut 431 is assembled at the boundary part and is opposite to the limiting nut 44 in rotation direction, so that the limiting nut 44 is not easy to unscrew out of the limiting bolt 45, and further the limiting nut 44 is reinforced.

The implementation principle of the embodiment 2 is as follows: when the hanging beam body 1 is extended, a technician inserts the hanging beam body 1 and the extension beam 2 into the connecting sleeve 33 from two end sides of the connecting sleeve 33 respectively, the limiting blocks 11 are clamped in the limiting grooves 21 under the limiting action of the supporting blocks 34, and the supporting blocks 34 further support the splicing part, so that the splicing stability is improved; after splicing, a technician interference-fits the locking block 351 in the first locking groove 352 and the second locking groove 353, so that the connecting sleeve 33 is not easily separated from the hanging beam body 1 and the extension beam 2; finally, the technician screws the limit bolt 45 into the first limit hole 41, so that the limit bolt 45 penetrates through the second limit hole 42 and then protrudes from the other side of the connecting sleeve 33, screws the limit nut 44 to the free end of the limit bolt 45 and screws the reinforcing nut 431 at the boundary, so that the reinforcing nut 431 is abutted against the limit nut 44, and the lengthening work of the hanging beam body 1 is completed.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a crane beam structure after old factory building extension is reformed transform, includes hanging beam body (1), its characterized in that: still include extension roof beam (2), hanging beam body (1) and extension roof beam (2) are laid along same straight line, hanging beam body (1) is close to the one end of extension roof beam (2) and is fixed with spacing block (11), spacing groove (21) have been seted up to one side that extension roof beam (2) are close to hanging beam body (1), in spacing groove (21) and with spacing groove (21) joint adaptation stopper (11) activity inserted, still be equipped with between extension roof beam (2) and hanging beam body (1) and be used for making the coupling assembling (3) that spacing block (11) are stably located spacing groove (21).

2. The crane beam structure after the old factory building lengthening and reconstruction as claimed in claim 1, wherein: coupling assembling (3) are including fixing base (31) and be used for making connecting piece (32) that fixing base (31) and hanging beam body (1), extension beam (2) are all stably connected, fixed slot (311) have been seted up on fixing base (31), fixed slot (311) are the opening form along hanging beam body (1) length direction's both ends, just hanging beam body (1) all stretches into in fixed slot (311) with the one end that extension beam (2) are close to each other, just hanging beam body (1) with the distolateral laminating that extension beam (2) are close to each other.

3. The crane beam structure after the old factory building lengthening and reconstruction as claimed in claim 2, wherein: connecting piece (32) are including locating piece (321), locating piece (321) are equipped with two sets ofly, two sets of locating piece (321) are all fixed locate on the interior diapire of fixed slot (311) and are located the both ends of fixing base (31), and is a set of locating piece (321) run through the diapire of hanging beam body (1), another group locating piece (321) run through the diapire of extension roof beam (2).

4. The crane beam structure after the old factory building lengthening and reconstruction as claimed in claim 3, wherein: all seted up fixed orifices (322) on locating piece (321), fixed orifices (322) internal thread is equipped with fixing bolt (323), fixing bolt (323)'s free end runs through fixing base (31) in proper order along fixed orifices (322) on two locating pieces (321) on the same side of hanging beam body (1) length direction, just fixing bolt (323) and the inside wall screw thread adaptation of fixed orifices (322), and fixing bolt (323)'s free end screw thread is equipped with fixation nut (324), and fixation nut (324) and the lateral wall of locating piece (321) counterbalance tightly.

5. The crane beam structure after the old factory building lengthening and reconstruction as claimed in claim 1, wherein: coupling assembling (3) are including connecting sleeve (33), the distolateral that hanging beam body (1) and extension beam (2) are close to each other all stretches into in connecting sleeve (33), just the internal perisporium of connecting sleeve (33) with the outer peripheral wall laminating of hanging beam body (1), extension beam (2), connecting sleeve (33) are all fixed with supporting shoe (34) along two relative inside walls of hanging beam body (1) length direction, supporting shoe (34) with the outer side wall laminating of hanging beam body (1), supporting shoe (34) with the outer side wall laminating of extension beam (2), still be equipped with locking piece (35) that are used for making connecting sleeve (33), hanging beam body (1) and extension beam (2) stable connection on connecting sleeve (33).

6. The crane beam structure after the old factory building lengthening and reconstruction as claimed in claim 5, wherein: locking piece (35) are including locking piece (351), first locking groove (352) have all been seted up to the both ends side of connecting sleeve (33), second locking groove (353) have all been seted up to the distolateral that hanging beam body (1) and extension roof beam (2) are close to each other, just first locking groove (352) and second locking groove (353) are close to each other the distolateral be linked together, just first locking groove (352) and second locking groove (353) are close to the opening of one side of each other and are narrower than the opening width of keeping away from one side of each other, locking piece (351) and first locking groove (352), the equal interference fit in second locking groove (353).

7. The crane beam structure after the old factory building lengthening and reconstruction as claimed in claim 6, wherein: the side wall of the connecting sleeve (33) is provided with a first limiting hole (41), the first limiting hole (41) penetrates through the supporting block (34) to be arranged, the hanging beam body (1) and the extension beam (2) are provided with a second limiting hole (42), the first limiting hole (41) corresponds to the second limiting hole (42) in a one-to-one mode, the connecting sleeve (33) is further provided with a limiting bolt (45), the free end of the limiting bolt (45) penetrates through the first limiting hole (41) and the second limiting hole (42) in sequence, the free end of the limiting bolt (45) is provided with a limiting nut (44) in a threaded mode, and the limiting nut (44) abuts against the side wall of the connecting sleeve (33).

8. The crane beam structure after the old factory building lengthening and reconstruction as claimed in claim 7, wherein: and the limiting bolt (45) is provided with a reinforcing piece (43) for reducing the looseness of the limiting nut (44).

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