CN112301894A - Steel box girder positioning device and steel box girder construction method for large-span bridge - Google Patents
Steel box girder positioning device and steel box girder construction method for large-span bridge Download PDFInfo
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- CN112301894A CN112301894A CN202011130234.XA CN202011130234A CN112301894A CN 112301894 A CN112301894 A CN 112301894A CN 202011130234 A CN202011130234 A CN 202011130234A CN 112301894 A CN112301894 A CN 112301894A
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- box girder
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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Abstract
The application discloses a steel box girder positioning device and a steel box girder construction method for a large-span bridge, wherein the device comprises a pair of matched eye-splice and joint, the eye-splice comprises an inserted bar, and the head of the inserted bar is provided with a plug; the connector comprises a receiving part for inserting the plug, a clamp spring is arranged at the inlet of the receiving part, and a guide part for inserting the plug into the receiving part in a sliding manner is connected to the front end of the inlet of the receiving part. The method comprises the steps of dividing the steel box girder into a plurality of sections, dividing each section into a plurality of hoisting blocks, and then assembling and translating. The adoption falls into the steel case roof beam and can realize the location between the steel case roof beam fast, and supplies the plug to slide through setting up the guide part that inserts the portion of accomodating, as long as send into near the guide part with the plug of eye-splice, just can slide the portion of accomodating with the plug fast through the guide part, accomplishes the location to the construction procedure can be simplified.
Description
Technical Field
The application relates to the technical field of bridge construction, in particular to a steel box girder construction method for a large-span bridge.
Background
With the development of steel industry and steel structure technology in China, the number of steel structure municipal bridges is continuously increased, and the characteristics of large torsional rigidity and good integrity of box-shaped sections enable the steel box girder structure to be widely applied in the design and construction process of municipal bridges, so that the steel box girder structure becomes the first choice of a girder form.
Along with the development of bridge technology and the requirement of traffic dispersion, the span of the urban steel box girder is continuously increased and tends to be greatly increased, and due to the characteristics of complexity of the construction environment of the municipal steel box girder, diversity of functional requirements, large span and the like; the manufacturing and construction of the steel box girder are different from those of the steel box girder of the railway and the highway; at present, steel box girders are generally hoisted on temporary buttresses to complete assembling and welding in the construction process, the operation space and the hoisting space in the construction process need high requirements, and in the construction process of some steel box girders crossing roads and railways, the hoisting space is limited, the construction conditions cannot be met, and the construction is greatly influenced.
Disclosure of Invention
The application aims to solve the problem that operation and hoisting space are insufficient during steel box girder construction, and provides a steel box girder positioning device and a steel box girder construction method for a large-span bridge.
First aspect, this application provides a steel box girder positioner, the technical scheme who adopts as follows:
a steel box girder positioning device comprises a pair of plug-in buckles and joints which are matched with each other, wherein each plug-in buckle comprises a plug rod, and the head of each plug rod is provided with a plug; the connector comprises a receiving part for inserting the plug, a clamp spring is arranged at the inlet of the receiving part, and a guide part for inserting the plug into the receiving part in a sliding manner is connected to the front end of the inlet of the receiving part.
Through the technical scheme, adopt a pair of matched with eye-splice and joint to carry out the location of steel box roof beam, in the hoist and mount of steel box roof beam hoist and mount piece, only need to cooperate two adjacent eye-splices with the joint and accomplish the location of two adjacent hoist and mount pieces promptly, can realize the location between the steel box roof beam fast, and supply the plug to slide and insert the guide portion of containing portion through setting up, as long as send the plug of eye-splice into near the guide portion, just can slide the plug into containing portion fast through the guide portion, accomplish the location.
Optionally, the insert buckle and the joint are respectively provided with a support, one end of the support is respectively connected with the insert buckle or the joint, and the other end of the support is used for being welded with the steel box girder.
Through the technical scheme, the support is connected with the inserting buckle and the joint respectively, the other end of the support is used for being welded with the hoisting block of the steel box girder, so that the positioning device can be installed on the hoisting block of the steel box girder, and meanwhile, the positioning device can be conveniently and subsequently detached from the steel box girder.
Optionally, a trigger mechanism is arranged in the receiving portion of the connector, and when the plug is completely clamped into the receiving portion, the trigger mechanism is connected to the prompting device to send out prompting information.
Through above-mentioned technical scheme, just represent when the plug is blocked completely in the storage part and accomplished the location, send prompt message through suggestion device this moment, remind operating personnel to accomplish the hoist and mount of this hoist and mount piece.
Optionally, a contact is arranged in the accommodating part, the contact is connected with a voice circuit, and when the plug is completely clamped in the accommodating part, the contact is connected to connect the voice circuit.
Through above-mentioned technical scheme, when the plug is blocked the storage part completely, the contact switch-on, the switch-on voice circuit plays the suggestion that the location was accomplished, reminds operating personnel to accomplish the hoist and mount of this hoist and mount piece.
Optionally, a pull ring is further disposed on the bracket.
Through above-mentioned technical scheme, through set up the pull ring on the support, be convenient for pull steel case roof beam through the pull ring and carry out the translation.
In a second aspect, the application further provides a steel box girder construction method for a large-span bridge, which includes the following steps:
(1) a temporary assembling support is arranged between the two piers, and a hoisting area is arranged on the outer side of each pier;
(2) two through long longitudinal beams and a middle longitudinal beam are arranged between the two piers, and the longitudinal beams and the middle longitudinal beam are erected on the assembling support (9);
(3) hoisting the steel box girder in a hoisting area, dividing the steel box girder into a plurality of sections along a longitudinal bridge, dividing each section into a plurality of hoisting blocks along the transverse direction, and welding at least 1 group of positioning devices on two adjacent hoisting blocks; hoisting each hoisting block of the first section of the steel box girder member to an assembling support for assembling, welding each hoisting block, and positioning two adjacent hoisting blocks through positioning devices welded on the hoisting blocks in the assembling process;
(4) after the hoisting blocks of the first section are assembled into a whole, arranging a rolling sliding device on the longitudinal beam, and arranging the rolling sliding device in the area below the first section;
(5) dragging, rolling and sliding the first segment to the position of the area above the capping beam of the pier on the other side;
(6) repeating the steps, dragging the second section to the rear of the first section to be in contact with the first section, and welding a ring opening butt welding seam between the first section and the second section;
(7) repeating the steps, dragging all the sections of the steel box girder to the right position, and completing the welding work of all the ring opening butt welding seams;
(8) after the steel box girders are all spliced into a whole, vertical jacks are distributed on the bent caps on the two sides of the bridge pier;
(9) jacking the vertical jack to enable the steel box girder to be supported above the vertical jack, and dismantling the longitudinal beam and the middle longitudinal beam;
(10) and adopting a vertical jack to drop the steel box girder to the upper part of the support on the cover beam, finally dismantling the temporary assembling support at the lower part, and cutting the positioning device from the steel box girder to complete the installation of the steel box girder.
By the technical scheme, the steel box girder is divided into a plurality of sections along the longitudinal bridge, and each section is dragged to the corresponding position through the rolling sliding device to perform splicing and welding of the welding line, so that the hoisting space can be effectively saved; and each segment is transversely divided into a plurality of hoisting blocks, and then each hoisting block is spliced by hoisting, so that the single hoisting weight can be reduced, the requirements on a hoisting mechanism are reduced, the requirements on hoisting space are further reduced, a positioning device is arranged among the transversely divided hoisting blocks, the positioning among the hoisting blocks can be quickly and accurately realized during hoisting, the fact that the hoisting blocks are aligned along the transverse direction and the longitudinal direction is ensured, and the quality of welding seams is improved. The positioning device is fixed to each hoisting block in a welding mode, and the positioning device is detached from the hoisting blocks in a cutting mode after assembly is completed, so that the structural strength of the hoisting blocks cannot be influenced, and the quality of a bridge is guaranteed.
Optionally, the rolling sliding device comprises a support plate, support legs arranged below the support plate, and rollers connected with the support legs; the lower end of the supporting plate is also provided with a jack, and a piston of the jack is connected with the lower end surface of the supporting plate; the supporting legs are telescopic and locked structures.
Through the technical scheme, the supporting leg structure that will roll the displacement and adopt jack and scalable locking, when needs carry out the sliding of festival section, carry out the jacking with the backup pad through starting the jack, the backup pad drives steel box girder segment section and promotes, then extend the supporting leg, and lock, then the jack withdrawal again, on the weight of festival section just falls into the supporting leg like this, accomplish the support of roll displacement to the festival section, the festival section of being convenient for removes through the roll displacement and displacement device.
Optionally, the supporting leg includes a fixed rod and a movable rod, the fixed rod is fixed to the lower end face of the supporting plate, and the movable rod can slide and be locked in the fixed rod.
Through above-mentioned technical scheme, after the jack with the backup pad jacking, the movable rod will move down in the dead lever, then through locking movable rod and dead lever, can accomplish the locking of supporting leg.
Optionally, the locking between the movable rod and the fixed rod is locked by an automatic locking mechanism.
Through above-mentioned technical scheme, adopt and lock automatic locking mechanism between movable rod and the dead lever, after the jack jacking, the movable rod moves down in the dead lever, removes to certain position after, and automatic locking mechanism just locks between dead lever and the movable rod automatically, does not need the manual work to go to lock dead lever and movable rod, has not only improved efficiency, can avoid the manual work to go to lock in addition and take place dangerous accident.
Optionally, the automatic locking mechanism includes a connecting spring disposed between the fixed rod and the movable rod, a first positioning hole disposed on the fixed rod, and a second positioning hole disposed on the movable rod; the outer side of the fixed rod is also provided with an elastic inserted rod which penetrates through a first positioning hole on one side of the fixed rod to be abutted against the movable rod.
Through the technical scheme, after the jack jacking, the movable rod moves downwards under the thrust action of the dead lever dead weight and the spring in the dead lever, and when the movable rod moves to the set position, namely the second positioning hole on the movable rod is overlapped with or concentric with the first positioning hole on the dead lever, the elastic insertion rod can be automatically inserted into the second positioning hole, so that the first positioning hole is connected with the second positioning hole through the elastic insertion rod, and the locking between the dead lever and the movable rod is realized.
To sum up, the beneficial technical effect of this application does:
1. the application provides a steel box girder positioner, adopt a pair of matched with eye-splice and joint to carry out the location of steel box girder, in the hoist and mount of steel box girder hoist and mount piece, only need to cooperate two adjacent eye-splices and joint and accomplish the location of two adjacent hoist and mount pieces promptly, can realize the location between the steel box girder fast, and supply the plug to slide and insert the guide portion of containing portion through setting up, as long as send into near the guide portion with the plug of eye-splice, just can slide the plug into containing portion fast through the guide portion, accomplish the location.
2. The application provides a steel box girder positioner through set up suggestion device in the portion of accomodating, goes into the portion of accomodating when the plug is complete and accomplishes the location back, sends suggestion information through suggestion device, reminds operating personnel to accomplish the hoist and mount of this hoist and mount piece, can improve the efficiency of hoist and mount.
3. According to the construction method for the steel box girder for the large-span bridge, the steel box girder is divided into a plurality of sections along the longitudinal bridge, and each section is dragged to the corresponding position through the rolling sliding device to be spliced and welded with the welding seam, so that the hoisting space can be effectively saved; and each segment is transversely divided into a plurality of hoisting blocks, and then each hoisting block is spliced by hoisting, so that the single hoisting weight can be reduced, the requirements on a hoisting mechanism are reduced, the requirements on hoisting space are further reduced, a positioning device is arranged among the transversely divided hoisting blocks, the positioning among the hoisting blocks can be quickly and accurately realized during hoisting, the fact that the hoisting blocks are aligned along the transverse direction and the longitudinal direction is ensured, and the quality of welding seams is improved. The positioning device is fixed to each hoisting block in a welding mode, and the positioning device is detached from the hoisting blocks in a cutting mode after assembly is completed, so that the structural strength of the hoisting blocks cannot be influenced, and the quality of a bridge is guaranteed.
4. The application provides a steel box girder construction method for large-span bridge, the supporting leg through the roll displacement device that will lay adopts automatic locking mechanism to lock, after the jack jacking, the movable rod moves down in the dead lever, after removing certain position, automatic locking mechanism just locks between dead lever and the movable rod automatically, does not need the manual work to go to lock dead lever and movable rod, has not only improved efficiency, can avoid the manual work to go to lock and take place dangerous accident.
Drawings
FIG. 1 is a schematic structural view of a positioning device of the present application;
FIG. 2 is a cross-sectional block diagram of the positioning device of the present application;
FIG. 3 is a schematic structural view of the installation of the first section of the steel box girder of the present application;
FIG. 4 is a schematic structural view of a first section of the steel box girder of the present application;
FIG. 5 is a schematic structural view of the roll glide of the present application;
FIG. 6 is a schematic structural view of the steel box girder of the present application after all sections are installed;
fig. 7 is a sectional structural view of the roll shifting apparatus of the present application.
The parts in the figure are: 1. a positioning device; 2. a first segment; 3. a rolling sliding device; 4. a stringer; 5. a bridge pier; 6. a capping beam; 7. a support; 8. basic concrete; 9. assembling a support; 10. a highway; 11. a railway; 12. hoisting the area; 13. a vertical jack; 101. inserting a rod; 102. a plug; 103. a storage section; 104. a clamp spring; 105. a guide part; 106. a support; 107. connecting blocks; 108. a pull ring; 109. a first contact piece; 110. a second contact piece; 111. a connector body; 21. a first hoisting block; 22. a second hoisting block; 23. a third hoisting block; 24. a fourth hoisting block; 25. a fifth hoisting block; 26. a sixth hoisting block; 301. a support plate; 302. an anti-slip layer; 303. a jack; 304. supporting the boss; 305. a roller; 306. fixing the rod; 307. a movable rod; 308. a connecting frame; 309. a first positioning hole; 310. an elastic insertion rod; 311. and a second positioning hole.
Detailed Description
The present invention is described in further detail below with reference to figures 1-7.
Example 1:
referring to fig. 1 and 2, the present embodiment discloses a steel box girder positioning device, which includes a pair of mating buckles and joints. The buckle comprises an inserting rod 101, the tail part of the inserting rod 101 is fixed on a connecting block 107, a plug 102 is arranged at the head part of the inserting rod 101, and the plug 102 is of a hemispherical structure. The connector comprises a connector body 111, a receiving part 103 for inserting the plug 102 is arranged in the connector body 111, a clamp spring 104 is arranged at the inlet of the receiving part 103, a guide part 105 for inserting the plug 102 into the receiving part 103 in a sliding manner is connected to the front end of the inlet of the receiving part 103, the guide part 105 and the receiving part 103 are both obtained by slotting the connector body 111, wherein the guide part 105 is formed by slotting a conical, hemispherical or horn-shaped groove in the connector body 111. The receiving portion 103 is a cylindrical groove connected with a tapered or hemispherical groove.
In the positioning device 1, positioning is completed by merely inserting the plug 102 into the receiving portion 103 at the time of positioning. The guide portion 105 is used for guiding the plug 102 to be inserted into the receiving portion 103, the insertion rod 101 carries the plug 102 to move towards the connector body 111, and when the plug 102 abuts against the guide portion 105, the plug 102 can rapidly slide into the receiving portion 103 under the guidance of the guide portion 105, so that the positioning is completed.
A bracket 106 is connected to the connecting block 107, a bracket 106 is also connected to the joint body 111, and the bracket 106 is used for being welded with each hoisting block of the steel box girder.
The positioning device is used for positioning two adjacent steel box girder hoisting blocks on the steel box girder hoisting blocks, the position of the positioning device is above a bridge when the positioning device is used, in order to quickly master whether the hoisting blocks of the two steel box girders complete positioning or not, a trigger mechanism is arranged in the accommodating part 103 of the connector body 111, and when the plug 102 is completely clamped into the accommodating part 103, the trigger mechanism can be connected with a prompt device to send prompt information. Referring to fig. 2, in the present embodiment, the trigger mechanism employs two contact pieces, a first contact piece 109 on the side close to the circlip 104 and a second contact piece 110 on the side far from the circlip 104. When the header 102 is completely inserted into the housing 103, the header 102 moves in the direction of the second contact 110 against the first contact 109, and the first contact 109 and the second contact 110 are brought into contact with each other, thereby turning on the indicator.
The prompting device is a voice circuit, a preset recording is arranged in the voice circuit, for example, "positioning is completed", when the first contact sheet 109 is abutted to the second contact sheet 110, the voice circuit is connected, the preset recording is played, and a lifting worker is reminded of completing the installation and positioning of the two lifting blocks.
With continued reference to fig. 1, a pull ring 108 is further disposed on the bracket 106, and after the bracket 106 is welded to the hoisting block of the steel box girder, the steel box girder can be pulled by the pull ring 108.
The embodiment of the application discloses steel box girder positioner, its theory of operation is:
when the positioning device 1 is used, the plug 2 is inserted to search the receiving part 103 in the joint body 111, when the plug 2 reaches the guide part 105 on the joint body 111, the plug can easily slide into the receiving part 103 from the guide part 105, and the positioning device is particularly suitable for positioning two hoisting blocks during hoisting.
The embodiment of the application also discloses a construction method of the steel box girder of the large-span bridge, and referring to fig. 3, the construction method is that the steel box girder is erected between two piers 5, the two piers 5 cross a road 10 and a railway 11, so the span is large, and meanwhile, in order to not influence the road 10 and the railway 11, the hoisting operation cannot be carried out between the two piers 5. Therefore, the following steps are adopted in the present embodiment to perform the use job:
(1) and arranging a temporary assembling support 9 between the two piers 5, constructing a temporary support foundation concrete 8 on the open space between the two piers 5, then installing the assembling support 9 on the foundation concrete 8, and arranging a hoisting area 12 outside one pier 5.
(2) Two longitudinal beams 4 and a middle longitudinal beam 14 which are long and continuous are arranged between the two piers 5 through hoisting, and the longitudinal beams 4 and the middle longitudinal beam 14 are erected on the assembling support 9.
(3) In the hoisting area 12, the steel box girder is hoisted, the steel box girder is divided into a plurality of sections along the longitudinal bridge, each section is divided into a plurality of hoisting blocks along the transverse direction, in the embodiment, the steel box girder is divided into 3 sections along the longitudinal bridge direction, each section is divided into 3 hoisting blocks, referring to fig. 4, taking the first section 2 as an example, the first section 2 comprises 1 middle block and two cantilever arm blocks, and 1 middle block is a second hoisting block 22; the two cantilever block bodies are respectively a first hoisting block 21 and a third hoisting block 23.
At least 1 group of the positioning devices 1 are welded on two adjacent hoisting blocks, in the embodiment, two groups of the positioning devices 1 are arranged between the first hoisting block 21 and the second hoisting block 22 along the longitudinal direction and are used for connecting and positioning the first hoisting block 21 and the second hoisting block 22; two groups of positioning devices 1 are arranged between the second hoisting block 22 and the third hoisting block 23 along the longitudinal direction and are used for connecting and positioning the second hoisting block 22 and the third hoisting block 23, and when the connection and positioning are started, the plugs 102 between the positioning devices 1 are not inserted into the accommodating parts 103, so that preparation is made for subsequent hoisting.
Then begin to lift by crane first section 2 and assemble, assemble each hoist and mount piece hoist and mount to assembling on the support 9 of first section 2 of steel box girder component to with welding between each hoist and mount piece, at the in-process of assembling, two adjacent hoist and mount pieces fix a position through welded positioner 1 on it, and concrete process is:
(31) in the hoisting area 12, a second hoisting block 22 is hoisted to the splicing support 9 by adopting a truck crane;
(32) then, a truck crane is adopted to hoist the third hoisting block 23 to the assembling support 9 and is spliced with the second hoisting block 22, specifically, the third hoisting block 23 and the second hoisting block 22 are positioned by clamping the plug 102 on the positioning device 1 into the accommodating part 103, so that the third hoisting block 23 and the second hoisting block 22 are positioned, the alignment of a gap between the third hoisting block 23 and the second hoisting block 22 is ensured, and the alignment of the third hoisting block 23 and the second hoisting block 22 along the longitudinal direction is ensured; meanwhile, welding seams between the third hoisting block 23 and the second hoisting block 22 are welded;
(33) and continuously hoisting the first hoisting block 21 by using the truck crane, wherein the method is the same as the assembling process of the third hoisting block 23 and the second hoisting block 22 in the previous step, and simultaneously, the welding work of related welding seams is synchronously performed, so that the assembling of the first section 2 is completed.
(4) After the hoisting blocks of the first section 2 are assembled into a whole, arranging a rolling sliding device 3 on the longitudinal beam 4, and arranging the rolling sliding device 3 in the lower area of the first section 2; referring to fig. 5, the rolling skid 3 includes a support plate 301, support legs disposed below the support plate 301, and rollers 305 connected to the support legs; an anti-slip layer 302 is provided at the upper end of the support plate 301. The lower end of the supporting plate 301 is further provided with a jack 303, a piston of the jack 303 is connected with the lower end face of the supporting plate 301, the lower end of the jack 303 is further connected with a supporting boss 304, and the supporting leg is of a structure capable of being contracted and locked. The jack 303 is laid out as follows: the telescopic part of the supporting leg is firstly released, the piston of the jack 303 is lowered to the lowest position, so that the height of the whole rolling sliding device 3 is lower, the whole rolling sliding device can be pushed onto the longitudinal beam 4 below the first section 2 from the longitudinal beam 4 which does not cover the first section 2, or can be placed on the longitudinal beam 4 below the first section 2 in advance, and the anti-skid layer 302 is not contacted with the lower end surface of the first section 2 at the beginning and is still arranged with a certain distance between the two.
And starting the jack 303, jacking the supporting plate 301 by the jack 303, jacking the first section 2 by the supporting plate 301 at the same time, enabling the first section to be separated from the contact with the assembling support 9, and extending and locking the supporting leg at the moment. The piston of the jack 303 is then lowered again, at which point the cylinder of the jack 303 moves upwards, so that the jack 303 is out of contact with the stringer 4. The laying of the roll glide 3 is now complete.
(5) Dragging and rolling the first section 2 to slide to the position of the area above the capping beam 6 of the pier 5 on the other side, wherein the dragging is realized by tying a steel wire rope on a hoisting ring 108 on a positioning device 1 arranged on the first section 2, and then dragging the first section 2 by adopting a chain block or the like on the other side of the pier 5, and certainly, the dragging can also be realized by adopting a hoisting traction mechanism.
(6) Repeating the steps, dragging the second section to the rear of the first section 2 to be in contact with the first section 2, and welding a ring mouth butt welding seam between the first section 2 and the second section;
(7) repeating the steps, dragging all the sections of the steel box girder to the right position, and completing the welding work of all the ring opening butt welding seams;
(8) referring to fig. 6, after the steel box girders are all spliced into a whole, vertical jacks 13 are distributed on the bent caps 6 on the two sides of the pier 5;
(9) jacking the vertical jack 13 to enable the steel box girder to be supported above the vertical jack 13, and dismantling the longitudinal girder 4;
(10) and adopting a vertical jack 13 to drop the steel box girder above the support 7 on the cover beam 6, finally removing the temporary assembling support 9 at the lower part, and cutting the positioning device 1 from the steel box girder to complete the installation of the steel box girder.
Example 2:
the rest of this embodiment is the same as embodiment 1, except that the support leg of the rolling sliding device 3 in this embodiment is capable of automatically locking, referring to fig. 7, the support leg of the rolling sliding device 3 in this embodiment includes a fixed bar 306 and a movable bar 307, the fixed bar 306 is fixed to the lower end face of the support plate 301, and the movable bar 307 is slidable in the fixed bar 306.
A connecting spring is arranged between the fixed rod 306 and the movable rod 307, two first positioning holes 309 are arranged on the fixed rod 306, and two second positioning holes 311 are arranged on the movable rod 307; two elastic insertion rods 310 are further arranged on the outer side of the fixed rod 307, the elastic insertion rods 310 are fixed on the fixed rod 306 through a connecting frame 308 and a spring, and each elastic insertion rod 310 penetrates through one first positioning hole 309 to abut against the movable rod 307.
The jack 303 is started, the jack 303 lifts the supporting plate 301, meanwhile, the supporting plate 301 also lifts the first section 2, so that the first section 2 is separated from contact with the assembly support 9, the movable rod 307 of the supporting leg can fall in the fixed rod 306 at the moment, the elastic insertion rod 310 is always abutted against the movable rod 307 in the falling process, when the second positioning hole 311 in the movable rod 307 reaches the position of the elastic insertion rod 310, the elastic insertion rod 310 can be inserted into the second positioning hole 311 under the action of the spring, each supporting leg is inserted into the second positioning hole 311 through the two elastic insertion rods 310 on the supporting leg, and thus, the automatic locking of the supporting leg is completed.
Since the fixed bar 307 is always pressed by the two elastic insertion bars 310, if the fixed bar 307 cannot automatically fall down under its own weight, the movable bar 307 is pushed down by the spring between the fixed bar 306 and the movable bar 307, so that the movable bar 307 is not jammed.
The above embodiments are all preferred embodiments of the present application, and the scope of protection of the present application is not limited thereby, 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 (10)
1. The utility model provides a steel box girder positioner which characterized in that: the plug comprises a pair of plug buckles and joints which are matched with each other, wherein each plug buckle comprises a plug rod (101), and a plug (102) is arranged at the head of each plug rod (101); the connector comprises a receiving part (103) for inserting the plug (102), a clamp spring (104) is arranged at the inlet of the receiving part (103), and the front end of the inlet of the receiving part (103) is connected with a guide part (105) for inserting the plug (102) into the receiving part (103) in a sliding manner.
2. The steel box girder positioning device according to claim 1, wherein: the steel box beam connector is characterized in that a support (106) is arranged on the insert buckle and the connector respectively, one end of the support (106) is connected with the insert buckle or the connector respectively, and the other end of the support is used for being welded with a steel box beam.
3. The steel box girder positioning device according to claim 2, wherein: a trigger mechanism is arranged in the containing part (103) of the connector, and when the plug (102) is completely clamped in the containing part (103), the trigger mechanism can be connected with a prompting device to send out prompting information.
4. The steel box girder positioning device according to claim 3, wherein: a contact piece is arranged in the accommodating part (103), the contact piece is connected with a voice circuit, and when the plug (102) is completely clamped in the accommodating part (103), the contact piece is connected to connect the voice circuit.
5. The steel box girder positioning device according to claim 2, wherein: and a pull ring (108) is also arranged on the bracket (106).
6. A construction method of a steel box girder for a large-span bridge is characterized by comprising the following steps:
(1) a temporary splicing support (9) is arranged between the two piers (5), and a hoisting area (12) is arranged on the outer side of one pier (5);
(2) two longitudinal beams (4) which are long through and a middle longitudinal beam (14) are arranged between the two piers (5), and the longitudinal beams (4) and the middle longitudinal beam (14) are erected on the splicing support (9);
(3) hoisting the steel box girder in a hoisting area (12), dividing the steel box girder into a plurality of sections along a longitudinal bridge, dividing each section into a plurality of hoisting blocks along the transverse direction, and welding at least 1 group of positioning devices (1) as claimed in any one of claims 1-5 on two adjacent hoisting blocks; hoisting each hoisting block of the first section (2) of the steel box girder component to an assembling bracket (9) for assembling, welding each hoisting block, and positioning two adjacent hoisting blocks through positioning devices (1) welded on the hoisting blocks in the assembling process;
(4) after the hoisting blocks of the first section (2) are assembled into a whole, arranging a rolling sliding device (3) on the longitudinal beam (4), and arranging the rolling sliding device (3) in the area below the first section (2);
(5) dragging, rolling and sliding the first segment (2) to a position above a capping beam (6) of the pier (5) on the other side;
(6) repeating the steps, dragging the second section to the rear of the first section (2) to be in contact with the first section (2), and welding a ring opening butt-joint welding seam between the first section (2) and the second section;
(7) repeating the steps, dragging all the sections of the steel box girder to the right position, and completing the welding work of all the ring opening butt welding seams;
(8) after the steel box girders are all spliced into a whole, vertical jacks (13) are distributed on the bent caps (6) at two sides of the pier (5);
(9) jacking a vertical jack (13), supporting the steel box girder above the vertical jack (13), and dismantling the longitudinal beam (4) and the middle longitudinal beam (14);
(10) and adopting a vertical jack to drop the steel box girder above a support (7) on the cover beam (6), finally dismantling the temporary assembling support (9) at the lower part, and cutting the positioning device (1) from the steel box girder to complete the installation of the steel box girder.
7. The steel box girder construction method for a large-span bridge according to claim 6, wherein: the rolling sliding device (3) comprises a support plate (301), support legs arranged below the support plate (301) and rollers (305) connected with the support legs; a jack (303) is further arranged at the lower end of the supporting plate (301), and a piston of the jack (303) is connected with the lower end face of the supporting plate (301); the supporting legs are telescopic and locked structures.
8. The steel box girder construction method for a large-span bridge according to claim 7, wherein: the supporting leg comprises a fixed rod (306) and a movable rod (307), the fixed rod (306) is fixed with the lower end face of the supporting plate (301), and the movable rod (307) can slide and be locked in the fixed rod (306).
9. The steel box girder construction method for a large-span bridge according to claim 8, wherein: the locking between the movable rod (307) and the fixed rod (306) is locked by an automatic locking mechanism.
10. The steel box girder construction method for a large-span bridge according to claim 9, wherein: the automatic locking mechanism comprises a connecting spring arranged between the fixed rod (306) and the movable rod (307), a first positioning hole (309) arranged on the fixed rod (306) and a second positioning hole (311) arranged on the movable rod (307); an elastic insertion rod (310) is further arranged on the outer side of the fixed rod (307), and the elastic insertion rod (310) penetrates through a first positioning hole (309) on one side of the fixed rod (306) to be abutted against the movable rod (307).
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