CN115217040A - Incremental launching construction method for overlong curve steel box combination beam - Google Patents
Incremental launching construction method for overlong curve steel box combination beam Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 120
- 239000010959 steel Substances 0.000 title claims abstract description 120
- 238000010276 construction Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 claims abstract description 41
- 230000008569 process Effects 0.000 claims abstract description 37
- 239000002131 composite material Substances 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims 1
- 230000002411 adverse Effects 0.000 abstract description 4
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- 238000003466 welding Methods 0.000 description 8
- 230000005484 gravity Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 230000004888 barrier function Effects 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
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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Abstract
The invention discloses a pushing construction method for an ultra-long curve steel box combination beam, which comprises the following steps: 1) Constructing a jig frame on the pushing starting point of the roadbed; 2) Assembling a steel box girder and a guide girder on the jig frame; 3) A right pushing support platform is erected on the left pier capping beam and the right pier capping beam, and pushing equipment is arranged on the right pushing support platform; performing pushing construction on the right steel box girder, and removing the right pushing support platform and the falling beam after pushing in place; 4) A left pushing support platform and pushing equipment are erected above a left pier capping beam and a right pier capping beam on the basis of a right steel box girder, and the pushing process is consistent with that of right pushing. According to the invention, the first pushing platform is erected firstly, the first pushing is carried out, then the second pushing platform is erected on the basis of the first steel box girder, the second steel box girder is pushed, the construction space of the ultra-long curve steel box girder is increased, the intersection of two girder bodies in the space during pushing is avoided, the adverse effect between the girder bodies is reduced, and the safety of the construction process is improved.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a pushing construction method for an ultra-long curve steel box combination beam.
Background
The steel box girder bridge is usually assembled and welded into a bridge in site after being prefabricated in sections due to the large weight of the whole girder body, and the steel box is used as the girder body and the panel adopts a reinforced concrete cast-in-place structure for the steel-concrete composite girder bridge, so that the steel box girder bridge is suitable for the bridge body with large span and complicated line shape; has the advantages of light weight, short construction period and the like. If a steel box girder bridge is built on an important main road in a crossing manner, steel box girder pushing construction is needed to avoid influence of the construction of a temporary auxiliary structure on main road traffic. The overlong means that the span between piers is longer, the span is higher, and the characteristic of higher pier columns is generally accompanied; the curve means that the bridge line is not in a straight line segment, and the line has complex curvature change and is generally accompanied with longitudinal gradient. The traditional walking type pushing construction adopts a multi-point three-phase pushing machine to push a beam body to a design position from a position convenient for hoisting construction, and the beam body is matched with deviation rectification and beam falling operation to carry out bridge construction.
The conventional steel box girder pushing usually only relates to a single girder body, the left and right beams still adopt parallel separation construction if separated bridge pushing is encountered, and a series of problems can be generated if the double-amplitude curved steel box girder pushing construction adopts the mode:
1. due to the existence of curvature, the deviation of the pushing beam body can be generated in the walking type pushing process, and the mutual interference can be generated when the left and right frames are constructed in parallel. If the mode of firstly pushing the first frame and then pushing the second frame is adopted, the pushing process of the second frame is influenced by the first frame, and the construction space is seriously compressed.
2. The left and right parallel construction needs two sets of systematic incremental launching devices, although the mode of firstly ejecting the first web and then ejecting the second web may only need a single set of systematic incremental launching device (generally, two sets of systems are adopted due to the requirement of the construction period, so that the disassembly and moving time is avoided), the second web of incremental launching moulding beds need to be rearranged, and the position can be adjusted and moved in the construction process due to the influence of the first web.
3. The bridge incremental launching construction process generally comprises three procedures: pushing, rectifying and beam falling. The pushing is to push the beam body along the bridge direction. And the deviation rectification is to correct the linear deviation of the beam body in the process of advancing along the bridge. And the beam falling is the operation of falling the high beam body to the designed height after the pushing is finished. In the three processes, pushing and deviation rectification are carried out in an interweaving mode, the deviation rectification process is complex in procedure, and the stability of the whole pushing system is affected due to frequent deviation rectification, so that the deviation rectification process is reduced as much as possible in construction. No matter which kind of mode is adopted to carry out the top in disconnect-type curve steel box girder, all can be because of the narrow and small frequent operation of rectifying of production in construction space in the work progress.
4. The stand column on the pier stud has small connectivity and poor system stability.
5. In the pushing and deviation rectifying construction process, judgment on the pushing step distance and the deviation rectifying amount is usually carried out by field personnel in the process, and the judgment subjectivity is high.
Therefore, the traditional construction method has the problems, the pushing construction requirement of the overlong curve steel box girder cannot be met, and a pushing construction method which is high in efficiency, safe and stable is urgently needed.
Disclosure of Invention
Aiming at the problems in the background art, the invention provides a pushing construction method for an ultra-long curve steel box combined beam, which adopts a separated pushing construction method, wherein a pushing platform is firstly erected on a left pier support and a right pier support to perform first pushing, then the arrangement form of the supports is changed, a second pushing platform is erected on the basis of the first steel box beam to perform second pushing on the steel box beam, so that the construction space of the ultra-long curve steel box beam is increased, the intersection of two beam bodies in the space during pushing is avoided, the adverse effect generated by the two beam bodies in the curve pushing process is reduced, and the safety of the construction process is improved.
In order to realize the purpose, the invention adopts the following technical scheme: the pushing construction method for the overlong curve steel box composite beam comprises the following steps:
1) Constructing a jig frame on a pushing starting point of the roadbed, wherein the jig frame comprises a jig frame supporting structure and pushing equipment;
2) Assembling guide beams on the jig frame, and assembling the steel box girder after the guide beams are assembled;
3) A right-amplitude pushing support platform is erected on the left pier capping beam and the right pier capping beam, and pushing equipment is arranged on the right-amplitude pushing support platform; carrying out pushing construction on the right steel box girder, pushing forwards and splicing the right steel box girder to a bridge site, dismantling the right pushing support platform after the last section is pushed in place, and dropping the right steel box girder integrally onto a permanent support through beam dropping equipment;
4) Taking a right steel box girder as a foundation, erecting a left pushing support platform above a left pier capping beam and a right pier capping beam, and arranging pushing equipment on the left pushing support platform; and pushing and splicing the left steel box girder to a bridge position forwards, removing the left pushing support platform after the last section is pushed to the position, and dropping the left steel box girder to a permanent support integrally through beam dropping equipment.
Preferably, in the pushing process, a synchronous displacement sensor is observed, and the pushing synchronization condition is monitored; observing the working state of the pushing equipment and measuring the synchronism of each pushing equipment; controlling synchronous pushing by using a computer, detecting the moving deviation in real time and correcting the deviation in time; and monitoring the horizontal displacement of the temporary pier in real time and observing by combining the pushing pressure.
Preferably, in the pushing process, the steel box girder is transversely moved and corrected by using a tire frame and pushing equipment on a pushing support platform.
Preferably, the jig frame supporting structure comprises a pad beam, a first cushion block, a jig frame foundation, a supporting column a and a supporting beam, the pushing equipment is a walking jack, the pad beam and the supporting beam are arranged in parallel at equal height, the pad beam is arranged on the front side above the jig frame foundation through the walking jack, the supporting beam is arranged on the rear side of the jig frame foundation through the supporting column a, the steel box beam is placed on the pad beam and the supporting beam, and the first cushion block is arranged on the right sides of the tops of the pad beam and the supporting beam.
Preferably, the right-width pushing support platform comprises a support column b, a support column c, a first cross beam and a second cross beam, the first cross beam is installed above the front side of the pier column through the support column b, the second cross beam is installed above the rear side of the pier column through the support column c, the support column b is connected with the support column c through a first cross link, the first cross beam is installed at the top of the support column b, the second cross beam is installed at the top of the support column c, the first cross beam is connected with the second cross link through a second cross link, pushing equipment is installed at the tops of the first cross beam and the second cross beam, a walking jack is installed at the top of the walking jack, a support beam which is as high as the pad beam is installed at the top of the second cross beam through the support column a, and a right-width steel box beam is placed on the pad beam and the support beam.
Preferably, the bottoms of the supporting columns b and c are fixed on the pier column through embedded parts, the first cross beam and the supporting columns b, the second cross beam and the supporting columns c are connected and reinforced through inclined struts, and the first cushion blocks are arranged on the right sides of the tops of the cushion beams and the supporting beams.
Preferably, the left pushing support platform comprises a support column b, a support column c, a first cross beam and a second cross beam, the left side of the first cross beam is installed above the front side of the left pier column through the support column b, the left side of the second cross beam is installed above the rear side of the left pier column through the support column c, the support column b is connected with the support column c through a first cross link, the left side of the first cross beam is installed at the top of the support column b, the left side of the second cross beam is installed at the top of the support column c, the right sides of the first cross beam and the second cross beam are respectively installed at the top of the right steel box girder through a second cushion block, the first cross beam and the second cross beam are connected through a second cross link, pushing equipment is installed at the tops of the first cross beam and the second cross beam, the pushing equipment is a walking jack, a cushion beam is installed at the top of the walking jack, a support beam of the cushion beam and a support beam are installed at the top of the cushion beam, and the left steel box girder is placed on the cushion beam and the support beam.
Preferably, the first cross beam and the support column b, the second cross beam and the support column c and the left steel box girder and the first cross beam and the second cross beam are connected and reinforced through inclined struts.
As preferred, support column a bottom outside sets up first column base, and support column a top outside sets up first cap, and the bottom and the top of support column b and support column c are equallyd divide and are set up second column base and second cap respectively.
As preferred, the pier stud middle part is provided with the pump station, sets up safe construction platform around the pier stud top, and the outside of first crossbeam and second crossbeam is provided with the escape way respectively, and the escape way outside sets up safety barrier.
The invention has the beneficial effects that:
1. according to the invention, the first pushing platform is erected on the left pier bracket and the right pier bracket firstly to push the first steel box girder, then the second pushing platform is erected on the basis of the first steel box girder to push the second steel box girder, so that the construction space of the ultra-long curve steel box girder is increased, the intersection of two girder bodies in the space during pushing is avoided, the adverse effect caused by the two girder bodies in the curve pushing process is reduced, and the safety of the construction process is improved.
2. The pushing platform support provided by the invention is used for connecting the left pier support and the right pier support, the stability of a structural system for first pushing is enhanced, and the pushing platform set up during second pushing is set up by means of the box girder for first pushing, so that the stability is further enhanced.
3. In the second-amplitude pushing process, the arrangement of the jig frame and the pushing platform are similar to those of the first-amplitude pushing, the pushing process is similar to that of the first-amplitude pushing, the whole construction procedure does not need to be changed greatly, the construction efficiency is improved, only one set of pushing equipment is needed in the whole construction period, and equipment investment is saved.
Drawings
FIG. 1 is a plan view of the right steel box girder pushing construction layout of the invention;
FIG. 2 is an elevational view of FIG. 1;
FIG. 3 is a plan view of the left steel box girder pushing construction layout of the present invention;
FIG. 4 is an elevational view of FIG. 3;
FIG. 5 is a schematic view of the arrangement of the pushing apparatus on the jig frame of the present invention;
FIG. 6 is a side view of FIG. 5;
FIG. 7 is a schematic view of the arrangement of the support structure on the jig frame of the present invention;
FIG. 8 is a side view of FIG. 7;
FIG. 9 is a schematic view of a right-width steel box girder jacking support platform and jacking equipment of the invention;
FIG. 10 is a side view of FIG. 9;
FIG. 11 is a schematic layout view of a right steel box girder pushing support platform and support columns according to the present invention;
FIG. 12 is a side view of FIG. 11;
FIG. 13 is a schematic view of the left steel box girder jacking support platform and jacking equipment of the present invention;
FIG. 14 is a side view of FIG. 13;
FIG. 15 is a schematic view of the arrangement of a left steel box girder pushing support platform and a support pillar according to the present invention;
FIG. 16 is a side view of FIG. 15;
FIG. 17 is a schematic structural view of support posts b and c of the present invention;
FIG. 18 is a schematic view of the structure of a support pillar a of the present invention;
FIG. 19 is a plan view of the pump station and safety construction platform of the present invention;
FIG. 20 is a side view of the pump station and safety construction platform of the present invention;
FIG. 21 isbase:Sub>A cross-sectional view taken along line A-A of the present invention;
FIG. 22 is a schematic view of a secure tunnel configuration of the present invention;
the reference numbers in the figures are: a left pier stud 1; a right pier stud 2; a right steel box girder 3; a left steel box girder 4; a permanent support 5; a support column b6; a support column c7; an insert 8; an inclined strut 9; a walking jack 10; a pad beam 11; a first head block 12; a second leg 13; a second column cap 14; a first cross-member 15; a first cross member 16; a second cross member 17; a second cross-member 18; a jig base 19; a safe construction platform 20; a second cushion block 21; support column a22; a support beam 23; a guide beam 24; a first column shoe 25; a first cap 26; a pump station 27; a secure channel 28; safety guards 29.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to facilitate understanding of the skilled person.
Referring to fig. 1 to 16, the incremental launching construction method for the ultra-long curve steel box composite beam includes the following steps:
1) And applying a jig frame on the pushing starting point of the roadbed, wherein the jig frame comprises a jig frame supporting structure and pushing equipment. The manufacturing sequence of the jig frame is as follows: firstly, mounting foundation steel bars and embedded parts, manufacturing a jig frame foundation, mounting a jig frame support column, mounting a cross beam and mounting pushing equipment after the jig frame foundation meets the requirements, and finally checking and accepting.
2) And assembling the steel box girder on the jig frame. The steel box girders are transported to a construction site by a trailer after being processed in a segmented manner in a factory, a guide beam 24 and a first pushing part of the steel box girders are hoisted to a jig frame by a truck crane on a roadbed for assembling and welding, CO2 shielded welding is adopted for welding, and pushing equipment is installed in place after welding is completed, so that the integral overturn resistance and the maximum overhanging steel box girder lower winding degree of the structure can be ensured. The guide beam 24 is of a truss structure and consists of 2 welded H-shaped beams, the two guide beams are supported and connected through tie rods, and holes are formed in web plates of the guide beams to reduce the dead weight. The guide beam 24 is connected in sections by welding, and the welding seam requires full penetration. The main limb web plate of the guide beam 24 is in butt joint with the web plate of the steel box girder by adopting full penetration single-side groove welding, and the top bottom plate of the guide beam 24 is in butt joint with the top bottom plate of the steel box girder by adopting full penetration single-side groove welding. .
3) A right pushing support platform is firstly erected on the bent caps of the left pier 1 and the right pier 2, and pushing equipment is arranged on the right pushing support platform. Because the bridge is on a circular curve, a transition curve and a straight line segment, in order to make the pushing conform to the linear shape and reduce the transverse deviation rectifying times, the steel box girder and the guide girder 24 need to be assembled on the left roadbed of the assembly area. And then carrying out pushing construction on the right steel box girder 3. And when the pushing steel box girder advances for 20 meters, assembling two sections of the steel box girders at the back (analogizing in turn), after the last section is assembled, arranging a rear guide girder at the tail part, continuously pushing the steel box girder to the designed bridge position, and disassembling the guide girder. The steel box girder simply supported end falls to the permanent support 5, the continuous end is provided with the temporary support, the pre-throwing height of the steel box girder support is guaranteed, the girder falling equipment is disassembled, the temporary support is disassembled after concrete pouring is completed, the steel box girder falls on the permanent support 5, and the bridge steel box girder installation is completed.
4) Secondly, a left pushing support platform is erected above the capping beam of the left pier 1 and above the right steel box girder 3 on the basis of the right steel box girder 3, and pushing equipment is arranged on the left pushing support platform. The pushing step sequence of the left steel box girder is consistent with that of the right steel box girder. Continuously pushing and splicing the left steel box girder to a bridge position forwards, removing the left pushing support platform after the last section is pushed to the position, and dropping the left steel box girder to a permanent support integrally through beam dropping equipment.
By the pushing construction method, the left and right steel box girders are separately pushed and constructed, the construction space of the overlong curve steel box girder is increased, the intersection in space when the two girder bodies are pushed is avoided, the adverse effect caused by the two girder bodies in the curve pushing process is reduced, and the safety of the construction process is improved. Meanwhile, the pushing platform support is connected with the left pier support and the right pier support, the stability of a structure system pushed by a first pushing frame is enhanced, the pushing platform erected during pushing of a second pushing frame is erected by means of a box girder pushed by the first pushing frame, and the stability is further enhanced. Wherein the arrangement of the moulding bed and the pushing platform in the second pushing process are similar to those of the first pushing process, the pushing process is similar to that of the first pushing process, the whole construction procedure does not need to be greatly changed, the construction efficiency is improved, the whole construction period only needs one single pushing device, and equipment investment is saved.
Further, in the pushing process, a synchronous displacement sensor is observed, and the pushing synchronization condition is monitored. And observing the working state of the pushing equipment and measuring the synchronism of each pushing equipment during pushing. The synchronous pushing is controlled by a computer, the moving deviation is detected in real time, the deviation is corrected in time, and the eccentric load of a single pushing oil cylinder is avoided. The horizontal displacement of the temporary pier is monitored in real time, and the temporary pier is prevented from being damaged by combining pushing pressure observation.
Further, according to the line shape of the left axis and the line shape of the right axis of the steel box girder, on the premise of reasonably arranging the position of the jig frame on the roadbed, the jig frame and the pushing equipment on the pushing support platform are utilized to carry out transverse movement and deviation correction on the steel box girder in the pushing process. In the pushing process, the supporting column and the walking jack are always ensured to be positioned within the range of 2m of the width of the bottom of the two box chambers of the single steel box girder, otherwise, the position of the supporting column and the position of the pushing equipment need to be adjusted temporarily.
Further, the jig frame supporting structure comprises a pad beam 11, a first cushion block 12, a jig frame foundation 19, a supporting column a22 and a supporting beam 23, the pushing equipment is a walking jack 10, the pad beam 11 and the supporting beam 23 are arranged in parallel at equal height, the pad beam 11 is installed on the front side above the jig frame foundation 19 through the walking jack 10, the supporting beam 23 is installed on the rear side of the jig frame foundation 19 through the supporting column a22, and the steel box beam is placed on the pad beam 11 and the supporting beam 23. The bed-jig that has top pushing equipment and bearing structure through the matching setting ensures the support stability of steel box girder assembling process. Meanwhile, the steel box girder can be used as an initial position for pushing construction after the assembly of the steel box girder is completed. The first cushion block 12 is arranged on the right side of the tops of the pad beam 11 and the supporting beam 23 to support the steel box beam mounted above, so that the gravity center of the steel box beam is kept stable.
Further, the right-width jacking support platform comprises a support column b6, a support column c7, a first cross beam 16 and a second cross beam 17, the first cross beam 16 is installed above the front side of the pier column through the support column b6, the second cross beam 17 is installed above the rear side of the pier column through the support column c7, the support column b6 is connected with the support column c7 through a first cross link 15, the first cross beam 16 is installed at the top of the support column b6, the second cross beam 17 is installed at the top of the support column c7, the first cross beam 16 is connected with the second cross beam 17 through a second cross link 18, jacking equipment is installed at the tops of the first cross beam 16 and the second cross beam 17, the jacking equipment is a walking jack 10, a pad beam 11 is installed at the top of the walking jack 10, a support beam 23 which is equal in height to the pad beam 11 is installed at the top of the second cross beam 17 through a support column a22, and the right-width steel box beam 3 is placed on the pad beam 11 and the support beam 23. The right pushing support platform simultaneously takes the left pier stud 1 and the right pier stud 2 as installation bases, and stability of a supporting structure is guaranteed. And, support column b6 and support column c7 bottom are fixed on the pier stud through burying 8, all connect the reinforcement through setting up bracing 9 between first crossbeam 16 and support column b6, second crossbeam 17 and the support column c7, have ensured to push up the structural strength who pushes up the platform. The first cushion block 12 is arranged on the right side of the top of the pad beam 11 and the support beam 23, and supports the steel box girder to maintain the stable center of gravity.
Further, the left jacking support platform comprises a support column b6, a support column c7, a first cross beam 16 and a second cross beam 17, the left side of the first cross beam 16 is installed above the front side of the left pier column 1 through the support column b6, the left side of the second cross beam 17 is installed above the rear side of the left pier column 1 through the support column c7, the support column b6 is connected with the support column c7 through a first cross link 15, the left side of the first cross beam 16 is installed at the top of the support column b6, the left side of the second cross beam 17 is installed at the top of the support column c7, the right sides of the first cross beam 16 and the second cross beam 17 are respectively installed at the top of the right steel box girder 3 through a second cushion block 21, the first cross beam 16 is connected with the second cross beam 17 through a second cross link 18, jacking equipment is installed at the tops of the first cross beam 16 and the second cross beam 17, the jacking equipment is a walking jack 10, a cushion beam 11 is installed at the top of the walking jack 10, the top of the second cross beam 17 is installed at the same height as the support beam 11 through a support column a support beam 23, and the left steel box girder 4 is placed on the support beams 11 and a support beam 23. The second cushion block 21 is installed on the web of the right steel box girder 3, and the safety of the right steel box girder 3 is guaranteed. The left-width pushing support platform takes the left-width pier stud 1 and the right-width steel box girder 3 as installation bases, and is stable in structure. Meanwhile, the arrangement height of the left pushing support platform is basically the same as that of the right pushing support platform, the position of a jig frame on the front side and pushing equipment do not need to be adjusted, the same set of supporting component and pushing equipment is basically used with the right pushing support platform, and equipment investment is saved. And at the moment, the left pushing platform is positioned above the right steel box girder 3, and the left pushing operation space is consistent with the right pushing process, so that the left steel box girder 4 is basically not influenced by the right steel box girder 3 during pushing, and the convenience and the efficiency of the left steel box girder 4 pushing construction are greatly improved. Similarly, the first cross beam 16 and the support column b6, the second cross beam 17 and the support column c7, and the left steel box girder 4 and the first cross beam 16 and the second cross beam 17 are connected and reinforced through the inclined struts 9, so that the stability of the supporting structure is ensured.
Further, as shown in fig. 17 and 18, a first column base 25 is arranged on the outer side of the bottom of the support column a22, a first column cap 26 is arranged on the outer side of the top of the support column a22, and a second column base 13 and a second column cap 14 are respectively arranged at the bottom end and the top end of the support column b6 and the support column c7, so that the structural strength of the support column a22, the support column b6 and the support column c7 is guaranteed.
Further, as shown in fig. 19 to 22, a pump station 27 is arranged in the middle of the pier, a safety construction platform 20 is arranged around the top of the pier, safety channels 28 are respectively arranged on the outer sides of the first beam 16 and the second beam 17, and safety guardrails 29 are arranged on the outer sides of the safety channels 28, so that a platform and a space for operation and passing operation are provided for workers during pushing work, and convenience in construction is provided.
Compared with the traditional parallel separation construction mode of the left and right steel box girders, the left and right pushing support platforms take the left and right pier studs as the interconnected support bases, so that the operating space of the pushing platform is enlarged, the stability of the pushing platform is improved, the pushing platform can particularly adapt to the situation that the gravity center of the overlong curve steel box girder is continuously deviated in the pushing process, and the pushing process is stable. Meanwhile, the left and right pushing support platforms arranged in sequence are basically consistent in height and reserved operation space, excessive adjustment on arrangement forms and used equipment of a construction site is not needed, the deviation rectifying times are reduced, and the construction efficiency is greatly improved. Meanwhile, the pushing process of the left and right steel box girders is not interfered, and the safety and the construction efficiency of the construction process are improved.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, while the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A pushing construction method for an ultra-long curve steel box combination beam is characterized by comprising the following steps:
1) Constructing a jig frame on a pushing starting point of the roadbed, wherein the jig frame comprises a jig frame supporting structure and pushing equipment;
2) Assembling a steel box girder on the jig frame, and assembling a guide girder after the steel box girder is assembled;
3) A right-amplitude pushing support platform is erected on the left pier capping beam and the right pier capping beam, and pushing equipment is arranged on the right-amplitude pushing support platform; performing pushing construction on the right steel box girder, splicing and pushing the right steel box girder forwards to a bridge site, dismantling the right pushing support platform after the last section is pushed in place, and integrally dropping the right steel box girder onto a permanent support through girder dropping equipment;
4) Taking a right steel box girder as a foundation, erecting a left pushing support platform above a left pier capping beam and a right pier capping beam, and arranging pushing equipment on the left pushing support platform; splicing and pushing the left steel box girder forwards to a bridge position, removing the left pushing support platform after the last section is pushed to the position, and dropping the left steel box girder integrally onto the permanent support through a girder dropping device.
2. The incremental launching construction method for the ultra-long curve steel box composite beam as recited in claim 1, wherein: in the pushing process, a synchronous displacement sensor is observed, and the pushing synchronization condition is monitored; observing the working state of the pushing equipment and measuring the synchronism of each pushing equipment; controlling synchronous pushing by using a computer, detecting the moving deviation in real time and correcting the deviation in time; and monitoring the horizontal displacement of the temporary pier in real time and observing by combining the pushing pressure.
3. The incremental launching construction method of the ultra-long curve steel box composite beam as claimed in claim 1, wherein the incremental launching construction method comprises the following steps: and in the pushing process, the steel box girder is transversely moved and corrected by utilizing a jig frame and pushing equipment on a pushing support platform.
4. The incremental launching construction method for the ultra-long curve steel box composite beam as recited in claim 1, wherein: the bed-jig supporting structure comprises a pad beam (11), a first cushion block (12), a bed-jig foundation (19), a supporting column a (22) and a supporting beam (23), the pushing equipment is a walking jack (10), the pad beam (11) and the supporting beam (23) are arranged in parallel at the same height, the pad beam (11) is arranged on the front side above the bed-jig foundation (19) through the walking jack (10), the supporting beam (23) is arranged on the rear side of the bed-jig foundation (19) through the supporting column a (22), the steel box beam is placed on the pad beam (11) and the supporting beam (23), and the first cushion block (12) is arranged on the right side of the top of the pad beam (11) and the supporting beam (23).
5. The incremental launching construction method for the ultra-long curve steel box composite beam based on any one of claims 1 to 4 is characterized in that: the right-amplitude pushing support platform comprises a support column b (6), a support column c (7), a first cross beam (16) and a second cross beam (17), the first cross beam (16) is installed above the front side of the pier column through the support column b (6), the second cross beam (17) is installed above the rear side of the pier column through the support column c (7), the support column b (6) is connected with the support column c (7) through a first cross joint (15), the first cross beam (16) is installed at the top of the support column b (6), the second cross beam (17) is installed at the top of the support column c (7), the first cross beam (16) is connected with the second cross beam (17) through a second cross joint (18), pushing equipment is installed at the tops of the first cross beam (16) and the second cross beam (17), the pushing equipment is a walking jack (10), a pad beam (11) is installed at the top of the walking jack (10), the top of the second cross beam (17) is installed with a support beam (23) with the same height as the beam (11) through a support column a (22), and the right-amplitude box beam (3) and the pad beam (23) are placed on the support beam (23).
6. The incremental launching construction method for the ultra-long curve steel box composite beam as recited in claim 5, wherein: support column b (6) and support column c (7) bottom are fixed on the pier stud through burying piece (8), all are connected the reinforcement through setting up bracing (9) between first crossbeam (16) and support column b (6), second crossbeam (17) and the support column c (7), and first cushion (12) are arranged on floorbar (11) and a supporting beam (23) top right side.
7. The incremental launching construction method of the ultra-long curve steel box composite beam as claimed in any one of claims 1 to 6, wherein: the left pushing support platform comprises a support column b (6), a support column c (7), a first beam (16) and a second beam (17), the left side of a first cross beam (16) is installed above the front side of a left pier column (1) through a support column b (6), the left side of a second cross beam (17) is installed above the rear side of the left pier column (1) through a support column c (7), the support column b (6) is connected with the support column c (7) through a first cross joint (15), the left side of the first cross beam (16) is installed at the top of the support column b (6), the left side of the second cross beam (17) is installed at the top of the support column c (7), the right sides of the first cross beam (16) and the second cross beam (17) are respectively installed at the top of a right box girder (3) through a second cushion block (21), the first cross beam (16) is connected with the second cross joint (18) through the second cross beam (17), jacking equipment is a walking jack (10), the top of the walking jack (10) is provided with a cushion beam (11), the top of the second cross beam (17) is provided with a steel cushion beam (22), and the left cushion beam (23) and the support beam (11) are placed on the left box girder (4).
8. The incremental launching construction method of the ultra-long curve steel box composite beam as claimed in claim 7, wherein: all connect the reinforcement through setting up bracing (9) between first crossbeam (16) and support column b (6), second crossbeam (17) and support column c (7) and between left width of cloth steel box girder (4) and first crossbeam (16) and second crossbeam (17).
9. The incremental launching construction method for the ultra-long curve steel box composite beam as claimed in claims 4 to 8, wherein the incremental launching construction method comprises the following steps: support column a (22) bottom outside sets up first column base (25), and support column a (22) top outside sets up first cap (26), and the bottom and the top of support column b (6) and support column c (7) are equallyd divide and are set up second column base (13) and second cap (14) respectively.
10. The incremental launching construction method for the ultra-long curved steel box composite beam as claimed in claims 1 to 9, wherein the incremental launching construction method comprises the following steps: a pump station (27) is arranged in the middle of the pier column, a safe construction platform (20) is arranged around the top of the pier column, safe channels (28) are respectively arranged on the outer sides of the first cross beam (16) and the second cross beam (17), and a safety guardrail (29) is arranged on the outer side of each safe channel (28).
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| CN202210581524.9A CN115217040A (en) | 2022-05-26 | 2022-05-26 | Incremental launching construction method for overlong curve steel box combination beam |
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| CN202210581524.9A CN115217040A (en) | 2022-05-26 | 2022-05-26 | Incremental launching construction method for overlong curve steel box combination beam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117026840A (en) * | 2023-08-28 | 2023-11-10 | 中铁上海工程局集团第五工程有限公司 | Construction method for splicing and pushing steel box girders crossing high-speed curves |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117026840A (en) * | 2023-08-28 | 2023-11-10 | 中铁上海工程局集团第五工程有限公司 | Construction method for splicing and pushing steel box girders crossing high-speed curves |
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