CN110886184A - Device and method for reducing accurate matching additional stress of wide steel box girder of cable-stayed bridge - Google Patents
Device and method for reducing accurate matching additional stress of wide steel box girder of cable-stayed bridge Download PDFInfo
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- CN110886184A CN110886184A CN201911205135.0A CN201911205135A CN110886184A CN 110886184 A CN110886184 A CN 110886184A CN 201911205135 A CN201911205135 A CN 201911205135A CN 110886184 A CN110886184 A CN 110886184A
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- 239000010959 steel Substances 0.000 title claims abstract description 277
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 67
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 238000003466 welding Methods 0.000 claims description 28
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 14
- 238000004873 anchoring Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
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- 238000005516 engineering process Methods 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
- 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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed 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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a device and a method for reducing accurate matching additional stress of a wide steel box girder of a cable-stayed bridge, and belongs to the technical field of bridge construction. The method comprises the following steps: the temporary locking device is used for connecting the steel box girder segment to be installed and the installed steel box girder segment; the pressure testing system is positioned between the steel box girder segment to be installed and the installed steel box girder segment and is used for measuring the pressure between the steel box girder segment to be installed and the installed steel box girder segment; the pressure regulating system is located between the steel box girder segment to be installed and the installed steel box girder segment, and the pressure regulating system is used for regulating the pressure between the steel box girder segment to be installed and the installed steel box girder segment. The stress states of the flange plate, the inclined web plate, the bottom plate and the top plate are adjusted through the pressure testing system and the pressure adjusting system, the pressure is adjusted to be consistent, the precise matching construction quality of the steel box girder is improved, the 'precise matching secondary internal force' of the orthotropic plate area of the steel box girder is greatly reduced, and the local stress of the steel box girder structure is optimized.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a device and a method for reducing accurate matching additional stress of a wide steel box girder of a cable-stayed bridge.
Background
The ultra-wide steel box girder generally adopts a flat structure or a streamline structure, has the advantages of good wind resistance stability, light weight, short manufacturing and installation period and the like, is a preferred girder form of a large-span cable-stayed bridge under the water transportation convenient conditions of the great river, the sea and the like, and the girder section of the large-span ultra-wide steel box girder cable-stayed bridge generally adopts a bridge deck crane to integrally hoist and assemble the suspension construction.
However, according to the traditional precise matching construction scheme and steps of the wide steel box girder of the cable-stayed bridge, because the stress states of the girder section where the front support leg of the bridge deck crane is located (the Nth # installed steel box girder section at the foremost end of the cantilever end after hoisting construction) and the (N +1) # steel box girder section to be installed are different, the vertical deformation of the rear end of the (N +1) # steel box girder section to be installed is smaller than the vertical deformation of the front end of the Nth # installed steel box girder section where the front support leg of the bridge deck crane is located, so that the precise matching height difference is generated on two sides of the precise matching welding line, and the height difference can reach 50mm according to calculation and actual measurement of a plurality of bridges.
The traditional method is that a large number of code plates or reaction frames are adopted to force the height difference to be leveled and then to be welded, then the bridge crane is moved forwards to the next section, after the bridge crane is moved forwards, the steel box girder at the position of the pivot is subjected to pressure release, the local downward deflection rebounding generated before the steel box girder section is welded into a whole, the welding seam limits the local rebounding, so that the 'fine matching secondary internal force' can be generated in the area, and the 'fine matching secondary internal force' is unfavorable for the stress of the orthotropic plate of the steel box girder, and the problems of fatigue cracking of the welding seam of the U rib and the like can be caused.
The problems are always difficult problems in the precise matching of the ultra-wide steel box girder of the large-span cable-stayed bridge, and the problems are to be solved.
Disclosure of Invention
The invention aims to overcome the defects that the bridge deck crane is adopted for integral hoisting and splicing construction in the background technology and the steel box girder segments are welded into a whole to generate 'fine matching secondary internal force', and provides a device and a method for reducing the precise matching additional stress of the wide steel box girder of a cable-stayed bridge.
The invention provides a device for reducing accurate matching additional stress of a wide steel box girder of a cable-stayed bridge, which comprises:
the temporary locking device is used for connecting the steel box girder segment to be installed and the installed steel box girder segment, and the temporary locking device integrally connects the steel box girder segment to be installed and the installed steel box girder segment;
the pressure testing system is positioned between the steel box girder segment to be installed and the installed steel box girder segment and is used for measuring the pressure between the steel box girder segment to be installed and the installed steel box girder segment;
the pressure regulating system is positioned between the steel box girder segment to be installed and the installed steel box girder segment and is used for regulating the pressure between the steel box girder segment to be installed and the installed steel box girder segment.
The preferred scheme is as follows: the temporary locking device comprises a first temporary locking device and a second temporary locking device, the first temporary locking device is connected to the flange plates and the inclined webs of the steel box girder segments to be installed and the installed steel box girder segments, and the second temporary locking device is connected to the top plates and the bottom plates of the steel box girder segments to be installed and the installed steel box girder segments.
The preferred scheme is as follows: first temporary locking device is equipped with the multiunit, first temporary locking device includes first anchorage and first finish rolling screw-thread steel, treat to install all fixed on the flange board and the oblique web of steel box girder segment section and installed steel box girder segment section first anchorage, the anchor is seted up the anchor hole on the first anchorage, treat to install the first anchorage on the flange board and the oblique web of steel box girder segment section and installed steel box girder segment section and fasten through first finish rolling screw-thread steel.
The preferred scheme is as follows: the temporary second locking device comprises a plurality of groups of second anchor seats and second finish-rolled deformed steel bars, the top plates and the bottom plates of the steel box girder segments to be installed and the installed steel box girder segments are fixed, the second anchor seats are formed in the second anchor seats, anchoring holes are formed in the second anchor seats, and the top plates and the second anchor seats of the steel box girder segments to be installed and the installed steel box girder segments are fastened through the second finish-rolled deformed steel bars.
The preferred scheme is as follows: the pressure test system comprises a pressure test element, a pressure test instrument and a connecting line, wherein the pressure test element is clamped between the steel box girder segment to be installed and the installed steel box girder segment, the pressure test instrument is connected with the pressure test element through the connecting line, the pressure test element is used for collecting the pressure between the steel box girder segment to be installed and the installed steel box girder segment, and the pressure test instrument is used for reading the pressure between the steel box girder segment to be installed and the installed steel box girder segment detected by the pressure test element.
The preferred scheme is as follows: the pressure testing element is a heavy-load pressure sensor, and the pressure testing instrument is a digital display type pressure display.
The preferred scheme is as follows: the pressure adjusting system comprises an ultra-thin jack, jack control equipment and a connecting pipeline, the ultra-thin jack is clamped between a steel box girder segment to be installed and an installed steel box girder segment, the jack control equipment is connected with the ultra-thin jack through the connecting pipeline, and the jack control equipment controls the pressure of the ultra-thin jack through the connecting pipeline.
The preferred scheme is as follows: the jack control equipment is synchronous jack control equipment which controls a plurality of ultra-thin jacks to jack up synchronously.
The invention provides a method for reducing the accurate matching additional stress of the wide steel box girder of the cable-stayed bridge, which comprises the following steps:
after the accurate matching construction of the installed steel box girder segments is completed, the bridge deck crane travels to the front ends of the installed steel box girder segments;
the bridge deck crane lifts the steel box girder segment to be installed and adjusts the steel box girder segment to be installed to a target control elevation;
welding first temporary locking devices in joint areas of flange plates and inclined webs of the installed steel box girder segment and the steel box girder segment to be installed;
installing a pressure test system between the joint areas of the flange plates and the inclined webs of the installed steel box girder segments and the steel box girder segments to be installed, and acquiring pressure data of the joint areas of the flange plates and the inclined webs of the installed steel box girder segments and the steel box girder segments to be installed in real time;
tensioning the stay cable on the steel box girder segment to be installed for the first time, releasing the hook of the bridge deck crane and withdrawing, wherein the dead weight of the steel box girder segment to be installed is borne by the stay cable, and the measurement data of the pressure test system is the horizontal component force of the stay cable;
welding second temporary locking devices on the top plate and the bottom plate of the welding seam area of the installed steel box girder segment and the steel box girder segment to be installed;
installing a pressure adjusting system between a top plate and a bottom plate of a welding area of the installed steel box girder segment and the steel box girder segment to be installed, and adjusting the pressure states of a flange plate, an inclined web plate, the top plate and the bottom plate of the welding area of the installed steel box girder segment and the steel box girder segment to be installed;
leveling local height difference of a welding seam area by using a code plate, and welding a steel box girder segment to be installed with an installed steel box girder segment;
tensioning the stay cable on the steel box girder segment to be installed for the second time, and adjusting the cable force to a target value;
and (4) the bridge deck crane runs to the front end of the steel box girder segment to be installed, the next steel plate box girder segment is prepared to be hoisted, and the steps are repeated until the closure segment is formed.
On the basis of the technical scheme, compared with the prior art, the invention has the following advantages:
the invention discloses a device and a method for reducing accurate matching additional stress of a wide steel box girder of a cable-stayed bridge, which are used for locking a steel box girder segment to be installed on an installed steel box girder segment by combining a first temporary locking device and a second temporary locking device with a pressure testing system, a pressure adjusting system and a stay cable, replacing the integral hoisting and suspension construction of a bridge deck crane, ensuring that the stress state of the front end of the installed steel box girder segment is consistent with the stress state of the rear end of the steel box girder segment to be installed in the welding process of the wide steel box girder segment, greatly reducing the 'accurate matching height difference' caused by local deformation generated by the front fulcrum of the bridge deck crane, adjusting the stress states of flange plates, inclined webs, a bottom plate and a top plate area to be consistent by the pressure testing system and the pressure adjusting system, finally realizing the accurate matching construction quality of the steel box girder and greatly reducing the 'accurate matching secondary internal force' of the orthotropic plate area of the steel box girder, And local stress of the steel box girder structure is optimized.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic structural diagram of a first temporary locking device and a pressure testing system according to an embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 1 at B;
FIG. 5 is a schematic structural view of a second temporary locking mechanism and a pressure regulation system in accordance with an embodiment of the present invention;
FIG. 6 is a schematic structural view of an installed steel box girder segment and a steel box girder segment to be installed according to an embodiment of the present invention.
Reference numerals: 1-beam body, 2-first temporary locking device, 3-pressure testing system, 4-second temporary locking device, 5-pressure regulating system, 6-installed steel box beam segment, 7-steel box beam segment to be installed, 8-stay cable, 11-oblique web plate, 12-flange plate, 13-top plate, 14-bottom plate, 21-first anchor seat, 22-first finish-rolled deformed steel bar, 31-pressure testing element, 32-pressure testing instrument, 33-connecting line, 41-second anchor seat, 42-second finish-rolled deformed steel bar, 51-ultra-thin jack, 52-jack control device and 53-connecting pipeline.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Example 1
Referring to fig. 1 and 6, an embodiment of the present invention provides a device for reducing additional stress of a cable-stayed bridge wide steel box girder, which is accurately matched with the cable-stayed bridge wide steel box girder, and includes:
the temporary locking device is used for connecting the steel box girder segment 7 to be installed and the installed steel box girder segment 6, the steel box girder segment 7 to be installed and the installed steel box girder segment 6 are connected into a whole through the temporary locking device, and the steel box girder segment 7 to be installed and the installed steel box girder segment 6 are connected into a whole to form the girder body 1.
The pressure test system 3, the pressure test system 3 is located between waiting to install steel box girder segment 7 and installed steel box girder segment 6, and the pressure test system 3 is used for measuring the pressure between waiting to install steel box girder segment 7 and installed steel box girder segment 6.
And the pressure regulating system 5 is positioned between the steel box girder segment 7 to be installed and the installed steel box girder segment 6, and the pressure regulating system 5 is used for regulating the pressure between the steel box girder segment 7 to be installed and the installed steel box girder segment 6.
Principle of operation
According to the device for reducing the accurate matching additional stress of the wide steel box girder of the cable-stayed bridge, the temporary locking device is combined with the pressure testing system 3, the pressure adjusting system 5 and the stay cable 8 to lock the steel box girder segment 7 to be installed on the installed steel box girder segment 6, and the integral hoisting and splicing construction of a bridge deck crane is replaced. The front end of the installed steel box girder segment 6 is consistent with the rear end of the steel box girder segment 7 to be installed in the process of welding the wide steel box girder segment welding seam of the girder body 1, and the fine matching height difference caused by local deformation generated by the front pivot of the bridge deck crane is greatly reduced. The stress state of the welding seam area between the rear end of the steel box girder segment 7 to be installed and the front end of the installed steel box girder segment 6 is adjusted through the pressure testing system 3 and the pressure adjusting system 5, and the stress of the welding seam area is consistent. Finally, the steel box girder segment fine matching construction quality of the girder body 1 is improved, the 'fine matching secondary internal force' in the orthotropic plate area of the steel box girder segment is greatly reduced, and the local stress of the steel box girder structure is optimized.
Example 2
Referring to fig. 1 to 6, an embodiment of the present invention provides a device for reducing additional stress of a cable-stayed bridge wide steel box girder in precise matching, and the difference between the embodiment and embodiment 1 is as follows: the temporary locking means comprise a first temporary locking means 2 and a second temporary locking means 4, the first temporary locking means 2 being attached to the flange plates 11 and the diagonal webs 12 of the steel box girder segment 7 to be installed and the installed steel box girder segment 6. The second temporary locking means 4 are attached to the top and bottom plates 13, 14 of the steel box girder segments 7, 6 to be installed and the installed steel box girder segments 6.
Wherein: the first temporary locking devices 2 are provided with a plurality of groups, and the specific number of the first temporary locking devices 2 is determined according to the dead weight capable of bearing the steel box girder segment 7 to be installed. The first temporary locking devices 2 include first anchor blocks 21 and first finish-rolled deformed steel bars 22, and one set of the first temporary locking devices 2 is provided with two first anchor blocks 21 and four first finish-rolled deformed steel bars 22. The flange plates 12 and the inclined webs 11 of the steel box girder segments 7 to be installed and the installed steel box girder segments 6 are fixed with first anchorage bases 21. An anchoring hole is formed in the first anchor seat 21, and the steel box girder segment 7 to be installed and the flange plate 12 and the first anchor seat 21 on the inclined web plate 11 of the installed steel box girder segment 6 are fastened through the first finish-rolled deformed steel bar 22. The steel box girder segment 7 to be installed is temporarily attached to the installed steel box girder segment 6 by locking between the first finish-rolled deformed steel 22 and the first anchorage 21.
The second temporary locking devices 4 are provided with a plurality of groups, and the specific number of the second temporary locking devices 4 is determined according to the dead weight capable of bearing the steel box girder segment 7 to be installed. The second temporary locking means 4 differ from the first temporary locking means 2 in that: the second temporary locking means 4 have a structural strength greater than that of the first temporary locking means 2, the second temporary locking means 4 being able to bear a greater part of the self-weight of the steel box girder segment 7 to be installed than the first temporary locking means 2. Of course, the second temporary locking means 4 may be used instead of the first temporary locking means 2. The second temporary locking devices 4 include second anchorage 41 and second finish-rolled deformed steel bars 42, and one set of the second temporary locking devices 4 is provided with two second anchorages 41 and four second finish-rolled deformed steel bars 42. And second anchor bases 41 are fixed on the top plate 13 and the bottom plate 14 of the steel box girder segment 7 to be installed and the installed steel box girder segment 6, anchoring holes are formed in the second anchor bases 41, and the second anchor bases 42 on the top plate 13 and the bottom plate 14 of the steel box girder segment 7 to be installed and the installed steel box girder segment 6 are fastened through second finish-rolled screw steel 42. The steel box girder segment 7 to be installed is temporarily attached to the installed steel box girder segment 6 by locking between the second finish-rolled deformed steel bar 42 and the second anchorage 41.
Example 3
Referring to fig. 1, 2, 3 and 6, an embodiment of the present invention provides a device for reducing additional stress of a cable-stayed bridge wide steel box girder in precise matching, and the difference between the embodiment and the embodiment 2 is that: the pressure testing system 3 comprises a plurality of pressure testing elements 31, a plurality of pressure testing instruments 32 and connecting lines 33, wherein the plurality of pressure testing elements 31 are clamped between the steel box girder segment 7 to be installed and the first anchorage 21 of the first temporary locking device 2 on the installed steel box girder segment 6, and the pressure testing instruments 32 are connected with the plurality of pressure testing elements 31 through the connecting lines 33. The pressure test element 31 is preferably a heavy-load pressure sensor and is suitable for large-tonnage measurement of the steel box girder segment. The pressure test element 31 is used for acquiring the pressure level of the flange plate 12 and the inclined web plate 11 area between the steel box girder segment 7 to be installed and the installed steel box girder segment 6 after the stay cable 8 is tensioned for the first time. The pressure test elements 31 are installed before the stay cables 8 are tensioned, one pressure test element 31 is installed in each group of the first temporary locking devices 2, and the pressure test elements 31 are connected to the pressure test instrument 32 through connecting lines 33 to form the complete pressure test system 3. The pressure testing instrument 32 is preferably a digital display type pressure display, and the pressure testing instrument 32 is used for reading the pressure data of the flange plate 12 and the inclined web plate 11 areas between the steel box girder segment to be installed 7 and the installed steel box girder segment 6 detected by the pressure testing element 31 in real time.
Example 4
Referring to fig. 1, 4, 5 and 6, an embodiment of the present invention provides a device for reducing additional stress of a cable-stayed bridge wide steel box girder in precise matching, and the present embodiment is different from embodiment 2 in that: the pressure adjusting system 5 comprises a plurality of ultra-thin jacks 51, jack control equipment 52 and connecting pipelines 53, the ultra-thin jacks 51 are correspondingly clamped between the second anchor seats 41 of the second temporary locking devices 4 on the steel box girder segment 7 to be installed and the installed steel box girder segment 6, and the jack control equipment 52 is connected with the ultra-thin jacks 51 through the connecting pipelines 53. The jack control device 52 is preferably a synchronous jack control device, the jack control device 52 controls the pressure of the ultra-thin type jacks 51 through the connecting pipeline 53, and the jack control device 52 can control a plurality of ultra-thin type jacks 51 to be synchronously lifted. A plurality of ultra-thin type jacks 51 are installed after the stay cable 8 is tensioned for the first time, one ultra-thin type jack 51 is correspondingly installed on each group of second temporary locking devices 4, and the ultra-thin type jacks 51 are connected to jack control equipment 52 through connecting pipelines 53 to form a complete pressure regulating system 5. The pressure of the areas of the flange plates 12, the inclined webs 11, the top plates 13 and the bottom plates 14 of the steel box girder segments 7 to be installed and the installed steel box girder segments 6 can be controlled by the pressure regulating system 5 and read by a jack oil pressure gauge. And starting the pressure adjusting system 5 to start the ultra-thin jack 51, adjusting the stress state of the steel box girder segment 7 to be installed, and adjusting the pressure of the flange plate 12, the inclined web plate 11, the top plate 13 and the bottom plate 14 to be consistent.
Example 5
Referring to fig. 1 to 6, another aspect of the embodiments of the present invention provides a method for reducing additional stress of a cable-stayed bridge wide steel box girder in precise matching, including the following steps:
step 1, after the accurate matching construction of the installed steel box girder segments 6 is completed, the bridge deck crane runs to the front ends of the installed steel box girder segments 6.
And 2, lifting the steel box girder segment 7 to be installed by the bridge deck crane, and adjusting the steel box girder segment 7 to be installed to a target control elevation.
And 3, welding first anchor seats 21 of the first temporary locking devices 2 at the joint areas of the flange plates 12 and the inclined webs 11 of the installed steel box girder segments 6 and the steel box girder segments 7 to be installed, and fastening the first anchor seats 21 on the flange plates 12 and the inclined webs 11 of the steel box girder segments 7 and the installed steel box girder segments 6 to be installed through first finish-rolled threaded steel 22.
And 5, tensioning the stay cable 8 on the steel box girder segment 7 to be installed for the first time, releasing the hook of the bridge deck crane and withdrawing, determining the cable force of the stay cable 8 through calculation, bearing the self weight of the steel box girder segment 7 to be installed by the stay cable 8, and measuring pressure data by the pressure testing system 3 to be the horizontal component force of the stay cable 8.
And 6, welding second anchor seats 41 of the second temporary locking devices 4 on the top plate 13 and the bottom plate 14 of the welding seam area of the installed steel box girder segment 6 and the steel box girder segment 7 to be installed, and fastening the steel box girder segment 7 to be installed and the second anchor seats 41 on the top plate 13 and the bottom plate 14 of the installed steel box girder segment 6 through first finish-rolled screw steel 42.
And 8, leveling local height difference of a welding seam area by adopting a small number of stacking plates, and welding the steel box girder segment 7 to be installed with the installed steel box girder segment 6.
And 9, tensioning the stay cable 8 on the steel box girder segment 7 to be installed for the second time, and adjusting the cable force of the stay cable 8 to a target value.
And step 10, the bridge deck crane runs to the front end of the steel box girder segment 7 to be installed, next steel plate box girder segment hoisting construction is prepared, and the steps 1 to 9 are repeated until the closure section.
Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention, provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (9)
1. The utility model provides a reduce cable-stay bridge broad width steel case roof beam accurate matching additional stress device which characterized in that includes:
the temporary locking device is used for connecting the steel box girder segment (7) to be installed and the installed steel box girder segment (6), and the temporary locking device integrally connects the steel box girder segment (7) to be installed and the installed steel box girder segment (6);
the pressure test system (3), the pressure test system (3) is positioned between the steel box girder segment (7) to be installed and the installed steel box girder segment (6), and the pressure test system (3) is used for measuring the pressure between the steel box girder segment (7) to be installed and the installed steel box girder segment (6);
the pressure regulating system (5) is positioned between the steel box girder segment (7) to be installed and the installed steel box girder segment (6), and the pressure regulating system (5) is used for regulating the pressure between the steel box girder segment (7) to be installed and the installed steel box girder segment (6).
2. The device for reducing the additional stress of the cable-stayed bridge wide steel box girder in accurate matching according to claim 1, is characterized in that:
the temporary locking device comprises a first temporary locking device (2) and a second temporary locking device (4), the first temporary locking device (2) is connected to a flange plate (12) and a diagonal web (11) of the steel box girder segment (7) to be installed and the installed steel box girder segment (6), and the second temporary locking device (4) is connected to a top plate (13) and a bottom plate (14) of the steel box girder segment (7) to be installed and the installed steel box girder segment (6).
3. The device for reducing the additional stress of the cable-stayed bridge wide steel box girder in accurate matching according to claim 2, is characterized in that:
first temporary locking device (2) are equipped with the multiunit, first temporary locking device (2) are including first anchorage (21) and first finish rolling screw-thread steel (22), treat to install steel box girder segment (7) and all fix on flange plate (12) and oblique web (11) of steel box girder segment (6) first anchorage (21), the anchorage hole has been seted up on first anchorage (21), treat to install steel box girder segment (7) and install flange plate (12) and the first anchorage (21) on oblique web (11) of steel box girder segment (6) and fasten through first finish rolling screw-thread steel (22).
4. The device for reducing the additional stress of the cable-stayed bridge wide steel box girder in accurate matching according to claim 2, is characterized in that:
the temporary second locking device (4) is provided with multiple groups, the temporary second locking device (4) comprises a second anchor seat (41) and second finish rolling deformed steel bars (42), the steel box girder segment (7) to be installed and the top plate (13) and the bottom plate (14) of the installed steel box girder segment (6) are fixed on the second anchor seat (41), the anchor connection holes are formed in the second anchor seat (41), and the steel box girder segment (7) to be installed and the second anchor seat (41) on the top plate (13) and the bottom plate (14) of the installed steel box girder segment (6) are fastened through the second finish rolling deformed steel bars (42).
5. The device for reducing the additional stress of the cable-stayed bridge wide steel box girder in accurate matching according to claim 1, is characterized in that:
the pressure test system (3) comprises a pressure test element (31), a pressure test instrument (32) and a connecting line (33), wherein the pressure test element (31) is clamped between the steel box girder segment (7) to be installed and the installed steel box girder segment (6), the pressure test instrument (32) is connected with the pressure test element (31) through the connecting line (33), the pressure test element (31) is used for collecting the pressure between the steel box girder segment (7) to be installed and the installed steel box girder segment (6), and the pressure test instrument (32) is used for reading the pressure between the steel box girder segment (7) to be installed and the installed steel box girder segment (6) detected by the pressure test element (31).
6. The device for reducing the additional stress of the cable-stayed bridge wide steel box girder in accurate matching according to claim 5, is characterized in that:
the pressure testing element (31) is a heavy-load pressure sensor, and the pressure testing instrument (32) is a digital display type pressure display.
7. The device for reducing the additional stress of the cable-stayed bridge wide steel box girder in accurate matching according to claim 1, is characterized in that:
the pressure adjusting system (5) comprises an ultra-thin jack (51), jack control equipment (52) and a connecting pipeline (53), the ultra-thin jack (51) is clamped between a steel box girder segment (7) to be installed and an installed steel box girder segment (6), the jack control equipment (52) is connected with the ultra-thin jack (51) through the connecting pipeline (53), and the jack control equipment (52) controls the pressure of the ultra-thin jack (51) through the connecting pipeline (53).
8. The device for reducing the additional stress of the cable-stayed bridge wide steel box girder in accurate matching according to claim 7, is characterized in that:
the jack control equipment (52) is synchronous jack control equipment, and the jack control equipment (52) controls a plurality of ultra-thin jacks (51) to be synchronously jacked.
9. A method for reducing accurate matching additional stress of a wide steel box girder of a cable-stayed bridge is characterized by comprising the following steps:
after the steel box girder sections (6) are accurately matched and constructed, a bridge deck crane runs to the front ends of the steel box girder sections (6);
the bridge deck crane lifts the steel box girder segment (7) to be installed, and adjusts the steel box girder segment (7) to be installed to a target control elevation;
welding a first temporary locking device (2) in the joint area of a flange plate (12) and an inclined web plate (11) of the installed steel box girder segment (6) and the steel box girder segment (7) to be installed;
installing a pressure test system (3) between joint areas of flange plates (12) and inclined webs (11) of an installed steel box girder segment (6) and a to-be-installed steel box girder segment (7), and acquiring pressure data of the joint areas of the flange plates (12) and the inclined webs (11) of the installed steel box girder segment (6) and the to-be-installed steel box girder segment (7) in real time;
the stayed cable (8) on the steel box girder segment (7) to be installed is tensioned for the first time, the bridge deck crane loosens the hook and withdraws, the dead weight of the steel box girder segment (7) to be installed is borne by the stayed cable (8), and the measurement data of the pressure test system (3) is the horizontal component force of the stayed cable (8);
welding a second temporary locking device (4) on the top plate (13) and the bottom plate (14) of the welding seam area of the installed steel box girder segment (6) and the steel box girder segment (7) to be installed;
installing a pressure adjusting system (5) between a top plate (13) and a bottom plate (14) of a welding area of the installed steel box girder segment (6) and the steel box girder segment (7) to be installed, and adjusting the pressure state of a flange plate (12), an inclined web plate (11), the top plate (13) and the bottom plate (14) of the welding area of the installed steel box girder segment (6) and the steel box girder segment (7) to be installed;
leveling local height difference of a welding seam area by using a code plate, and welding a steel box girder segment (7) to be installed with an installed steel box girder segment (6);
secondly, tensioning the stay cable (8) on the steel box girder segment (7) to be installed, and adjusting the cable force to a target value;
and the bridge deck crane runs to the front end of the steel box girder segment (7) to be installed, the next steel plate box girder segment is prepared to be hoisted, and the steps are repeated until the closure segment is formed.
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| CN111893891A (en) * | 2020-07-27 | 2020-11-06 | 中交路桥建设有限公司 | Steel box girder installation method and steel box girder adjusting system |
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