CN111254840A - Integral beam falling structure and beam falling method for steel box girder bridge - Google Patents
Integral beam falling structure and beam falling method for steel box girder bridge Download PDFInfo
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- CN111254840A CN111254840A CN202010197161.XA CN202010197161A CN111254840A CN 111254840 A CN111254840 A CN 111254840A CN 202010197161 A CN202010197161 A CN 202010197161A CN 111254840 A CN111254840 A CN 111254840A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 141
- 239000010959 steel Substances 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010276 construction Methods 0.000 claims abstract description 17
- 229910000746 Structural steel Inorganic materials 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 2
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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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 invention relates to the technical field of steel structure bridge construction, in particular to an integral beam falling structure of a steel box girder bridge and a beam falling method, wherein a fixed supporting system and a movable supporting system are arranged between the steel box girder bridge and a steel frame platform structure, the fixed supporting system comprises a pad beam and a first cushion block structure arranged on the pad beam, the movable supporting system comprises a jacking device jack, a second cushion block structure, an auxiliary jack and a third cushion block structure, and the auxiliary jack and the third cushion block structure are only used for supporting the jacking device jack for use; therefore, the steel box girder bridge can be integrally jacked by the jacking equipment jack, the height of the first cushion block structure under the steel box girder is reduced layer by layer, and meanwhile, a girder falling cycle is realized by a method of lowering the jacking equipment jack layer by layer through the auxiliary jack; the steel box girder can be lowered to the elevation required by design through the cyclic operation of a plurality of falling girders, and the construction method for falling the girders has the characteristics of high construction efficiency, safety, reliability and good economical efficiency.
Description
Technical Field
The invention relates to the technical field of steel structure bridge construction, in particular to an integral beam falling structure and a beam falling method for a steel box girder bridge.
Background
When the steel box girder is constructed by adopting a pushing method, firstly, the steel box girder bridge is segmented or integrally pre-assembled at a pre-assembly position at the head (or tail) of the bridge, then, a pushing device is used for vertically and upwards jacking the pre-assembled steel box girder bridge for a certain distance, then, the steel box girder bridge is horizontally pushed for a certain distance in the direction of the installation position of the bridge, then, a jack of the pushing device descends and returns to the initial position without carrying, and then, the steel box girder bridge is circularly moved according to the method to gradually push the bridge to advance; because the bridge bottom plate is not necessarily horizontal in the length direction but has a certain radian, the bridge bottom plate needs to be pushed at a position higher than the actual installation height, so that the bridge bottom plate cannot collide with the pushing equipment in the pushing process of the bridge; therefore, a great height difference exists between the forward pushing curve of the bridge bottom plate and the beam falling curve of the bridge in place, and the bridge needs to be constructed when the bridge is pushed to the position above the installation position; the traditional beam falling mode is that a plurality of steel column supports are added below a steel box girder bridge and a pushing device, and the heights of the pushing device and the steel box girder bridge are gradually reduced by cutting the heights of the steel column supports in batches, wherein the method has the following defects: 1) the supporting height of the steel columns is cut in batches, the consistency of the height of each steel column is not easy to master, and the contact part of the steel box girder bottom plate and a jack of a pushing device is easy to be separated when the steel box girder bridge integrally falls, so that the steel box girder bottom plate is locally deformed; 2) the high-altitude or water cutting steel column has slow supporting speed, high labor intensity and poor safety; 3) after the steel columns are cut short, the upper and lower steel columns need to be welded together again to work as an integral steel support, so that the workload of beam falling is greatly increased, and the construction efficiency is reduced; these are undesirable to those skilled in the art.
Disclosure of Invention
Aiming at the existing problems, the invention discloses an integral beam falling structure of a steel box girder bridge, wherein the integral beam falling structure comprises the following components: the device comprises a steel frame platform structure, a movable supporting system and a fixed supporting system;
the steel box girder bridge is arranged on the steel frame platform structure, the movable supporting system and the fixed supporting system are arranged between the steel frame platform structure and the steel box girder bridge, and the fixed supporting system is arranged on both sides of the movable supporting system;
the fixed braced system including set up in structural pad beam of steel frame platform with set up in first cushion structure on the pad beam, first cushion structure is including a plurality of first cushions of upper and lower superpose in proper order, the activity braced system includes top pushing equipment jack, second cushion structure, auxiliary jack and third cushion structure, second cushion structure includes a plurality of second cushions of upper and lower superpose, third cushion structure includes a plurality of third cushions of upper and lower superpose, top pushing equipment jack set up in steel box girder bridge with between the second cushion structure, the second cushion structure set up in structural steel frame platform, auxiliary jack set up in top pushing equipment jack with between the third cushion structure, the third cushion structure set up in structural steel frame platform.
The steel frame platform structure comprises steel pipe piles, distribution beams and track beams, wherein the distribution beams are arranged on the steel pipe piles, the track beams are laid on the distribution beams in the longitudinal direction of the steel box girder bridge, and the pad beams, the second cushion block structures and the auxiliary jacks are arranged on the track beams.
In the integral beam falling structure of the steel box girder bridge, the distribution beam and the track beam are both box-shaped structures welded by double-spliced H-shaped steel.
The integral beam falling structure of the steel box girder bridge is characterized in that the first cushion block, the second cushion block and the third cushion block are all box-shaped steel structures.
In the integral beam falling structure of the steel box girder bridge, the heights of the first cushion block, the second cushion block and the third cushion block are all smaller than the maximum vertical lifting stroke of the jacking equipment jack and the maximum vertical lifting stroke of the auxiliary jack.
The integral beam falling structure of the steel box girder bridge is characterized in that a lifting lug is arranged at the bottom of the steel box girder bridge, a chain block is hung on the lifting lug, and holes are formed in the edges of the first cushion block, the second cushion block and the third cushion block.
In the integral beam falling structure of the steel box girder bridge, the adjacent first cushion blocks, the adjacent second cushion blocks, the adjacent third cushion blocks and the first cushion block structure and the pad beam are connected through the bolt pairs.
The invention also discloses an integral beam falling method of the steel box girder bridge, which is based on the integral beam falling structure of the steel box girder bridge, wherein the beam falling method comprises the following steps:
step S1, after the steel box girder bridge is jacked up by utilizing a jacking device jack so that the first cushion block structure is separated from the steel box girder bridge, removing the first cushion block of the first cushion block structure, which is positioned at the uppermost position;
step S2, descending the jacking equipment jack to enable the weight of the steel box girder bridge to fall on the first cushion block structure as a whole, and enabling the steel box girder bridge and the jacking equipment jack to be separated;
step S3, after the auxiliary jack is used for jacking the third cushion block structure to enable the jacking equipment jack to be separated from the second cushion block structure, the second cushion block positioned at the top in the second cushion block structure is dismounted;
step S4, descending the auxiliary jack to enable the jacking equipment jack to descend to the second cushion block structure, enabling the third cushion block structure to be separated from the jacking equipment jack, and detaching the third cushion block positioned at the top in the third cushion block structure;
and S5, repeating the steps S1-S4 until the height of the steel box girder bridge is reduced to the design required elevation, and then stopping the construction to finish the girder falling of the steel box girder bridge.
The invention has the following advantages or beneficial effects:
the invention discloses an integral beam falling structure of a steel box girder bridge and a beam falling method, wherein a fixed supporting system and a movable supporting system are arranged between the steel box girder bridge and a steel frame platform structure, the fixed supporting system comprises a pad beam and a first cushion block structure arranged on the pad beam, the movable supporting system comprises a jacking equipment jack, a second cushion block structure, an auxiliary jack and a third cushion block structure, and the auxiliary jack and the third cushion block structure are only used for supporting the jacking equipment jack for use; therefore, the steel box girder bridge can be integrally jacked by the jacking equipment jack, the height of the first cushion block structure under the steel box girder is reduced layer by layer, and meanwhile, a girder falling cycle is realized by a method of lowering the jacking equipment jack layer by layer through the auxiliary jack; the steel box girder can be lowered to the elevation required by design through the cyclic operation of a plurality of falling girders, and the construction method for falling girders has the characteristics of high construction efficiency, small workload, stable falling of the whole steel box girder bridge, safe and reliable construction, repeated use of materials and good economical efficiency, and can be widely applied to the construction operation of the whole falling girders of the steel box girder bridge.
Drawings
The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a front view of an integral beam falling structure of a steel box girder bridge before beam falling in the embodiment of the invention;
FIG. 2 is a cross-sectional view at AA in FIG. 1;
FIG. 3 is a front view of the integral girder-falling structure of the steel box girder bridge after girder-falling in the embodiment of the invention
FIG. 4 is a flow chart of an integral girder falling method of the steel box girder bridge in the embodiment of the invention;
in the figure: the steel box girder bridge comprises a steel pipe pile 1, a distribution girder 2, a track girder 3, a pad girder 4, a first cushion block structure 5, a second cushion block structure 6, a third cushion block structure 7, a bolt pair 8, a jacking equipment jack 9, an auxiliary jack 10, a lifting lug 11, a chain block 12 and a steel box girder bridge 13.
Detailed Description
The structure of the present invention will be further described with reference to the accompanying drawings and specific examples, but the present invention is not limited thereto.
The first embodiment is as follows:
as shown in fig. 1 to 3, the invention discloses an integral girder falling structure of a steel box girder bridge, and specifically, the integral girder falling structure of the steel box girder bridge comprises: the device comprises a steel frame platform structure, a movable supporting system and a fixed supporting system; the steel box girder bridge 13 is arranged on the steel frame platform structure, the movable supporting system and the fixed supporting system are arranged between the steel frame platform structure and the steel box girder bridge 13, and the fixed supporting system is arranged on both sides of the movable supporting system; the fixed supporting system comprises a pad beam 4 arranged on a steel frame platform structure and a first cushion block structure 5 arranged on the pad beam 4, the first cushion block structure 5 comprises a plurality of first cushion blocks which are sequentially overlapped up and down, the movable supporting system comprises a jacking device jack 9, a second cushion block structure 6, an auxiliary jack 10 and a third cushion block structure 7, the second cushion block structure 6 comprises a plurality of second cushion blocks which are stacked up and down, the third cushion block structure 7 comprises a plurality of third cushion blocks which are stacked up and down, the jacking equipment jack 9 is arranged between the steel box girder bridge 13 and the second cushion block structure 6, the second cushion block structure 6 is arranged on the steel frame platform structure, the auxiliary jack 10 is arranged between the jacking equipment jack 9 and the third cushion block structure 7, the third cushion block structure 7 is arranged on the steel frame platform structure, the auxiliary jack 10 and the third pad block structure 7 are only used for supporting the jacking device jack 9.
In a preferred embodiment of the present invention, the steel-frame platform structure comprises steel pipe piles 1, distribution beams 2, and track beams 3 to provide sufficient supporting force to support the weight of each structure thereon; the distribution beam 2 is arranged on the steel pipe pile 1, and the distribution beam 2 is of a box-shaped structure welded by double-spliced H-shaped steel so as to distribute the gravity transmitted from the upper part to the upper part of the steel pipe pile 1 in a balanced manner; this track roof beam 3 lays on distributive girder 2 along steel box girder bridge 13 longitudinal direction, and this steel frame platform structure has two these track roof beams 3, and this track roof beam 3 is the box structure that adopts the double pin H shaped steel to weld into, and this pad roof beam 4, second cushion structure 6 and auxiliary jack 10 all set up on track roof beam 3.
In a preferred embodiment of the present invention, the first pad block, the second pad block, and the third pad block are all made of box-type steel structures, and the first pad block, the second pad block, and the third pad block are all made of welded box-type steel structures, so that they have great rigidity and bearing capacity, and the elevation of the pad beam 4 should be smaller than the elevation of the steel box beam bridge 13 after the final beam falling, so that the steel box beam bridge 13 can be completely lowered onto a permanent pier.
In a preferred embodiment of the present invention, the heights of the first, second and third blocks are all smaller than the maximum vertical lifting stroke of the jacking device jack 9, and the heights of the first, second and third blocks are also smaller than the maximum vertical lifting stroke of the auxiliary jack 10, so that one block can be smoothly taken out in each stroke of the jacking device jack 9 and the auxiliary jack 10.
In a preferred embodiment of the invention, a lifting lug 11 is arranged at the bottom of the steel box girder bridge 13, a chain block 12 is hung on the lifting lug 11, and holes are formed in the edges of the first cushion block, the second cushion block and the third cushion block; specifically, the lifting lugs 11 are welded below the bottom plate of the steel box girder bridge 13; and the edges of the first cushion block, the second cushion block and the third cushion block are all cut with round holes to be used as connecting holes for bolting the chain block 12, so that the first cushion block, the second cushion block and the third cushion block can be conveniently detached through the chain block 12.
In a preferred embodiment of the invention, the adjacent first cushion blocks, the adjacent second cushion blocks, the adjacent third cushion blocks and the first cushion block structure 5 and the cushion beam 4 are connected through bolt pairs 8, so that the integrity between the cushion blocks and the high slippage performance in the construction process are improved, and the disassembly is convenient.
In a preferred embodiment of the present invention, the jacks 9 of the pushing devices in the beam-falling structure can be controlled by a computer and driven by a hydraulic pressure to realize a unified action, so as to realize uniform stress on all supporting points of the steel box girder bridge 13 and an overall height reduction, and avoid deformation caused by unbalanced local stress on the steel box girder bridge 13.
Example two:
as shown in fig. 3 and 4, the invention further discloses a method for integrally dropping the steel box girder bridge, which is based on the integral dropping structure of the steel box girder bridge in the first embodiment, and specifically comprises the following steps:
step S1, after the jacking device jack 9 is used to jack the steel box girder bridge 13 so as to empty the first pad structure 5 and the steel box girder bridge 13, the steel box girder bridge 13 is supported by the jacking device jack 9, and the chain block 12 is used to remove the first pad located at the top of the first pad structure 5.
Step S2, the jacking equipment jack 9 is lowered so that the weight of the steel box girder bridge 13 is entirely dropped on the first pad structure 5, and the steel box girder bridge 13 is emptied from the jacking equipment jack 9.
Step S3, the auxiliary jack 10 is started, and after the third pad structure 7 is jacked by the auxiliary jack 10 to empty the jacking device jack 9 from the second pad structure 6 (at this time, the auxiliary jack 10 and the third pad structure 7 support the weight of the jacking device jack 9), the second pad located at the top in the second pad structure 6 is removed by the inverted chain 12.
Step S4, lowering the auxiliary jack 10 to lower the jacking device jack 9 onto the second pad block structure 6, and removing the third pad block 7 located at the top of the third pad block structure 7 after the third pad block structure 7 is separated from the jacking device jack 9.
Step S5, repeating the steps S1-S4 (the jacking equipment jack 9 is restarted, the steel box girder bridge 13 is jacked integrally, and the girder falling circulation of the lower wheel is started), stopping until the height of the steel box girder bridge 13 is reduced to the designed required elevation, and finishing the girder falling construction of the steel box girder bridge 13; specifically, in each beam falling cycle process, one pad is removed from each of the first pad structure 5, the second pad structure 6 and the third pad structure 7, and when the height of the steel box girder bridge 13 is reduced to a design required elevation, the jack 9 of the pushing equipment is stopped to work, and beam falling construction is completed, as shown in fig. 3.
It is obvious that this embodiment is a method embodiment corresponding to the embodiment of the integral girder-dropping structure of the steel box girder bridge, and this embodiment can be implemented in cooperation with the embodiment of the integral girder-dropping structure of the steel box girder bridge. Related technical details mentioned in the above embodiments of the integral girder-falling structure of the steel box girder bridge are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related art details mentioned in the present embodiment can also be applied to the above-described embodiment of the steel box girder bridge integral girder construction.
Those skilled in the art will appreciate that variations may be implemented by those skilled in the art in combination with the prior art and the above-described embodiments, and will not be described herein in detail. Such variations do not affect the essence of the present invention and are not described herein.
The above description is of the preferred embodiment of the invention. It is to be understood that the invention is not limited to the particular embodiments described above, in that devices and structures not described in detail are understood to be implemented in a manner common in the art; those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments to equivalent variations, without departing from the spirit of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (8)
1. The utility model provides an integral girder construction that falls of steel box girder bridge which characterized in that includes: the device comprises a steel frame platform structure, a movable supporting system and a fixed supporting system;
the steel box girder bridge is arranged on the steel frame platform structure, the movable supporting system and the fixed supporting system are arranged between the steel frame platform structure and the steel box girder bridge, and the fixed supporting system is arranged on both sides of the movable supporting system;
the fixed braced system including set up in structural pad beam of steel frame platform with set up in first cushion structure on the pad beam, first cushion structure is including a plurality of first cushions of upper and lower superpose in proper order, the activity braced system includes top pushing equipment jack, second cushion structure, auxiliary jack and third cushion structure, second cushion structure includes a plurality of second cushions of upper and lower superpose, third cushion structure includes a plurality of third cushions of upper and lower superpose, top pushing equipment jack set up in steel box girder bridge with between the second cushion structure, the second cushion structure set up in structural steel frame platform, auxiliary jack set up in top pushing equipment jack with between the third cushion structure, the third cushion structure set up in structural steel frame platform.
2. The steel box girder bridge integral girder lowering structure of claim 1, wherein the steel frame platform structure comprises steel pipe piles, distribution girders disposed on the steel pipe piles, and track girders laid on the distribution girders in a longitudinal direction of the steel box girder bridge, and the pad girders, the second pad structures, and the auxiliary jacks are disposed on the track girders.
3. The steel box girder bridge integral girder lowering structure of claim 2, wherein the distribution girder and the track girder are both box-shaped structures welded by double-spliced H-shaped steel.
4. The steel box girder bridge integral girder construction of claim 1, wherein the first pad, the second pad and the third pad are all box steel structures.
5. The steel box girder bridge integral girder lowering structure of claim 1, wherein the heights of the first, second and third head blocks are all smaller than the maximum vertical lifting stroke of the jacking device jack and the maximum vertical lifting stroke of the auxiliary jack.
6. The integral girder lowering structure of the steel box girder bridge of claim 1, wherein the bottom of the steel box girder bridge is provided with a lifting lug, a chain block is hung on the lifting lug, and holes are formed in the edges of the first cushion block, the second cushion block and the third cushion block.
7. The integral girder lowering structure of the steel box girder bridge according to claim 1, wherein the adjacent first cushion blocks, the adjacent second cushion blocks, the adjacent third cushion blocks and the first cushion block structure and the cushion girder are connected by bolt pairs.
8. A steel box girder bridge integral girder falling method is based on the steel box girder bridge integral girder falling structure as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps:
step S1, after the steel box girder bridge is jacked up by utilizing a jacking device jack so that the first cushion block structure is separated from the steel box girder bridge, removing the first cushion block of the first cushion block structure, which is positioned at the uppermost position;
step S2, descending the jacking equipment jack to enable the weight of the steel box girder bridge to fall on the first cushion block structure as a whole, and enabling the steel box girder bridge and the jacking equipment jack to be separated;
step S3, after the auxiliary jack is used for jacking the third cushion block structure to enable the jacking equipment jack to be separated from the second cushion block structure, the second cushion block positioned at the top in the second cushion block structure is dismounted;
step S4, descending the auxiliary jack to enable the jacking equipment jack to descend to the second cushion block structure, enabling the third cushion block structure to be separated from the jacking equipment jack, and detaching the third cushion block positioned at the top in the third cushion block structure;
and S5, repeating the steps S1-S4 until the height of the steel box girder bridge is reduced to the design required elevation, and then stopping the construction to finish the girder falling of the steel box girder bridge.
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| CN202010197161.XA CN111254840A (en) | 2020-03-19 | 2020-03-19 | Integral beam falling structure and beam falling method for steel box girder bridge |
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| CN202010197161.XA CN111254840A (en) | 2020-03-19 | 2020-03-19 | Integral beam falling structure and beam falling method for steel box girder bridge |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111764288A (en) * | 2020-06-22 | 2020-10-13 | 中铁十八局集团有限公司 | Rack falling device and rack falling method |
| CN112359729A (en) * | 2020-10-23 | 2021-02-12 | 浙江毕姆信息科技有限公司 | Subway-striding walking type pushing construction method for single-hole large-span steel box girder |
| CN112431140A (en) * | 2020-12-03 | 2021-03-02 | 武汉思力特种工程机械施工有限公司 | Construction method for performing high-position beam falling of large bridge by means of walking machine |
| CN114790696A (en) * | 2022-04-27 | 2022-07-26 | 中铁重工有限公司 | Construction method for erecting and falling curved steel box girder |
| CN114892540A (en) * | 2022-06-13 | 2022-08-12 | 中交第二公路工程局有限公司 | Walking type pushing device and method for active adjustment of steel truss girder |
| CN115404782A (en) * | 2022-09-13 | 2022-11-29 | 中铁一局集团有限公司 | Steel box girder jacking and girder falling construction method |
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| CN114790696B (en) * | 2022-04-27 | 2023-10-27 | 中铁重工有限公司 | Construction method for erecting and falling curved steel box girder |
| CN114892540A (en) * | 2022-06-13 | 2022-08-12 | 中交第二公路工程局有限公司 | Walking type pushing device and method for active adjustment of steel truss girder |
| CN115404782A (en) * | 2022-09-13 | 2022-11-29 | 中铁一局集团有限公司 | Steel box girder jacking and girder falling construction method |
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