CN213709232U - Steel case roof beam owner mound jacking construction structures - Google Patents
Steel case roof beam owner mound jacking construction structures Download PDFInfo
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- CN213709232U CN213709232U CN202022163765.0U CN202022163765U CN213709232U CN 213709232 U CN213709232 U CN 213709232U CN 202022163765 U CN202022163765 U CN 202022163765U CN 213709232 U CN213709232 U CN 213709232U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 196
- 239000010959 steel Substances 0.000 title claims abstract description 196
- 238000010276 construction Methods 0.000 title claims abstract description 36
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 239000010720 hydraulic oil Substances 0.000 claims description 31
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 238000004873 anchoring Methods 0.000 claims description 10
- 239000011378 shotcrete Substances 0.000 abstract description 9
- 230000009194 climbing Effects 0.000 abstract description 7
- 230000001360 synchronised effect Effects 0.000 abstract description 7
- 238000004886 process control Methods 0.000 abstract description 5
- 239000004744 fabric Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003351 stiffener Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 235000014121 butter Nutrition 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model discloses a steel box girder owner mound jacking construction structures, including climbing mechanism and steel support system, climbing mechanism includes first jacking unit and second jacking unit, first jacking unit includes a plurality of first jacking hydraulic cylinder, second jacking unit includes a plurality of second jacking hydraulic cylinder, a plurality of first jacking hydraulic cylinder and a plurality of second jacking hydraulic cylinder are crisscross to be laid, the steel support system includes a plurality of steel shotcrete, cloth is equallyd divide to first jacking hydraulic cylinder and second jacking hydraulic cylinder's lower part has a steel shotcrete, the steel shotcrete includes a plurality of steel support units, be provided with spacing on the even tie roof beam. The utility model discloses a first jacking unit and second jacking unit prop up and carry out synchronous jacking in turn between steel shotcrete and distribution roof beam, can effectively solve the uncontrolled problem that jacking bridge additional stress brought because of supporting inhomogeneous settlement, realize the continuous jacking overall process control of steel box girder, improve steel box girder jacking efficiency, guarantee the security and the reliability of steel box girder jacking.
Description
Technical Field
The utility model belongs to the technical field of the bridge increases, concretely relates to steel box girder owner mound jacking construction structures.
Background
Due to inaccuracy of road design and construction perspective prediction, a large amount of clearance is insufficient on road traffic lines and navigation channels in China. In this case, the normal construction method generally adopted is dismantling and rebuilding. The construction method inevitably faces the problems of long construction period, large influence on the original traffic, high construction cost, environmental damage and the like. As a novel bridge reconstruction technology, the bridge jacking technology has the advantages of economy, reasonability, short construction period and small influence on social environment, and has incomparable advantages compared with the traditional method. In order to reduce the social influence as much as possible, shorten the construction period and even not interrupt traffic, the bridge is required to be subjected to column-breaking jacking construction.
At present, a common construction method in the bridge column-breaking jacking technology is hydraulic oil cylinder jacking, and hydraulic jacking is the only choice especially in large-tonnage bridge jacking engineering. The hydraulic oil cylinder system can provide strong jacking force, and the whole hydraulic oil cylinder system is connected by the oil pipe, so that the hydraulic oil cylinder system can play a role together when jacking. At present, the integral jacking system of the hydraulic oil cylinder, in particular to a synchronous jacking technology is basically mature. However, there is a great risk that the hydraulic jacking system is used as a support system: if accidents such as hydraulic pressure internal leakage and oil pipe burst occur during jacking, the safety of bridge jacking is threatened, and even inestimable safety accidents occur. Meanwhile, the existing steel box girder broken column jacking construction generally has the problems of sudden internal stress change of a jacked steel box girder, uneven settlement of support and uncontrollable additional stress of a jacking bridge caused by uneven settlement of support.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that it is not enough among to above-mentioned prior art, a steel box girder owner mound jacking construction structure is provided, it is through regarding existing cushion cap as the counter-force basis, a plurality of steel shotcrete of anchor on the cushion cap, install climbing mechanism in steel box girder lower part through the distribution roof beam simultaneously, make first jacking unit and second jacking unit prop up and carry out synchronous jacking in turn between steel shotcrete and distribution roof beam, can effectively solve the uncontrolled problem that jacking bridge additional stress brought because of supporting inhomogeneous settlement, realize the continuous jacking overall process control of steel box girder, improve steel box girder jacking efficiency, guarantee the security and the reliability of steel box girder jacking.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a steel box girder owner mound jacking construction structures, includes steel box girder and sets up a plurality of existing main mound support systems in steel box girder lower part, existing main mound support system includes two existing main mounds, two the bottom of existing main mound is provided with the cushion cap, and the upper end of two existing main mounds is provided with even tie beam, its characterized in that: the steel supporting system used for supporting the steel box girder and the jacking mechanisms erected between the steel supporting system and the steel box girder are arranged on the outer side of each existing main pier, the number of the jacking mechanisms and the number of the steel supporting systems are equal to that of the existing main piers and correspond to that of the existing main piers one by one, two distribution girders for installing the jacking mechanisms are arranged on the lower portion of the steel box girder, each jacking mechanism comprises a first jacking unit and a second jacking unit, each first jacking unit comprises a plurality of first jacking hydraulic cylinders arranged on two sides of the existing main piers, each first jacking unit comprises a plurality of second jacking hydraulic cylinders arranged on two sides of the existing main piers, each first jacking hydraulic cylinder and each second jacking hydraulic cylinder are arranged at the bottom of each distribution girder, and the first jacking hydraulic cylinders and the second jacking hydraulic cylinders are arranged in a staggered mode;
the steel support system comprises a plurality of steel supports anchored on the bearing platform, the lower parts of the first jacking hydraulic oil cylinder and the second jacking hydraulic oil cylinder are equally distributed with one steel support, each steel support comprises a plurality of steel support units, each steel support corresponding to the existing main pier is integrally and fixedly connected through a plurality of transverse fixing frames, two sides of the connecting beam are respectively provided with a limiting frame for limiting the steel box girder, and the upper end of the limiting frame is fixedly connected with the steel box girder.
Foretell steel box girder owner mound jacking construction structures, its characterized in that: and a plurality of displacement sensors for measuring the jacking height of the steel box girder are arranged on the steel box girder.
Foretell steel box girder owner mound jacking construction structures, its characterized in that: and four steel supports are respectively arranged on two sides of the existing main pier.
Foretell steel box girder owner mound jacking construction structures, its characterized in that: the cylinder bodies of the first jacking hydraulic cylinder and the second jacking hydraulic cylinder are fixed on the lower side of the distribution beam, the piston rod ends of the first jacking hydraulic cylinder and the second jacking hydraulic cylinder are vertically and downwards arranged, and the piston rod ends of the first jacking hydraulic cylinder and the second jacking hydraulic cylinder are supported at the upper ends of the corresponding steel supports.
Foretell steel box girder owner mound jacking construction structures, its characterized in that: one or more temporary cushion blocks are arranged at the upper end of the steel support.
Foretell steel box girder owner mound jacking construction structures, its characterized in that: the distributing beam is a double-spliced I-shaped steel formed by two I-shaped steels, each stiffening rib is arranged on the outer sides of two flange plates of the I-shaped steel at equal intervals along the length direction of the two flange plates, and the two flange plates of the I-shaped steel are welded into a whole through a connecting plate.
Foretell steel box girder owner mound jacking construction structures, its characterized in that: and two adjacent steel support units in the steel support are connected through flanges.
Foretell steel box girder owner mound jacking construction structures, its characterized in that: spacing is the spacing of right trapezoid, spacing includes two short stands and two long stands, the upper end of short stand and long stand all welds in the lower part of steel box girder, every all be connected with an oblique connecting rod, two between the lower extreme of short stand and the lower extreme rather than adjacent long stand the oblique connecting rod is parallel to each other, every between short stand and rather than adjacent long stand and two all be connected with a plurality of stiffeners between the long stand.
Foretell steel box girder owner mound jacking construction structures, its characterized in that: two long stand columns in the limiting frame are arranged on one side close to the connecting beam, and brackets for guiding the long stand columns are anchored on two sides of the connecting beam.
Foretell steel box girder owner mound jacking construction structures, its characterized in that: the lower part of the steel support is anchored on the bearing platform through a plurality of anchoring ribs, and the plurality of anchoring ribs are arranged on the same circumference at equal intervals.
Compared with the prior art, the utility model has the following advantage:
1. the utility model discloses a lower part at the steel case roof beam sets up the distribution roof beam, installs jacking hydraulic cylinder on the distribution roof beam simultaneously for the inhomogeneous atress that produces when the steel case roof beam jacking all can not be with warping forcing the stack for the steel case roof beam, guaranteed the steel case roof beam not produce the too big and condition of destruction of local atress in jacking in-process core department bottom plate.
2. The utility model discloses a with the steel shotcrete anchor on the cushion cap, can make existing cushion cap as climbing mechanism's counter-force basis, consequently can guarantee that this counter-force basis has sufficient intensity and stability, avoid bridge jacking in-process counter-force basis to take place to subside.
3. The utility model discloses a divide into first jacking unit and second jacking unit with climbing mechanism, can realize the synchronous jacking in turn of first jacking unit and second jacking unit, when first jacking unit jacking, upwards add in the lower part of second jacking unit gradually and establish the steel support unit, when second jacking unit jacking, upwards add in the lower part of first jacking unit gradually and establish the steel support unit, make and subside by the steel box girder structure difference of jacking and eliminate basically, solve the uncontrolled problem that jacking bridge additional stress brought because of supporting inhomogeneous settlement, realize the continuous jacking overall process control of steel box girder, improve bridge jacking efficiency.
4. The utility model discloses a both sides at the tie beam are provided with a spacing respectively, can carry on spacingly to the steel box roof beam through spacing, can guarantee at the steel box roof beam at the in-process of jacking, and the lateral displacement of steel box roof beam is controllable, avoids the bridge to take place obvious skew or crooked, and then can effectively guarantee the security and the reliability of bridge jacking.
To sum up, the utility model discloses a with existing cushion cap as counter-force basis, a plurality of steel shotcrete of anchor on the cushion cap, install climbing mechanism in steel box girder lower part through the distribution roof beam simultaneously, make first jacking unit and second jacking unit prop up and carry out synchronous jacking in turn between steel shotcrete and distribution roof beam, can effectively solve the uncontrolled problem that jacking bridge additional stress brought because of supporting inhomogeneous settlement, realize the continuous jacking overall process control of steel box girder, improve steel box girder jacking efficiency, guarantee the security and the reliability of steel box girder jacking.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is the mounting structure schematic diagram of the jacking mechanism and the steel support system of the utility model.
Fig. 3 is a top view of fig. 2 with the steel box girder removed.
Fig. 4 is a schematic view of the installation structure of the limiting frame of the present invention.
Fig. 5 is a top view of fig. 4 with the steel box girder removed.
Fig. 6 is a left side view of fig. 4.
Fig. 7 is a schematic structural view of the distribution beam of the present invention.
Fig. 8 is a left side view of fig. 7.
Fig. 9 is a schematic view of the arrangement of the anchoring ribs at the lower part of the steel support according to the present invention.
Description of reference numerals:
1-steel box girder; 2, main pier; 3-a distribution beam;
3-1-i-beam; 3-2-stiffeners; 3-connecting plate;
4-1-a first jacking hydraulic oil cylinder; 4-2-a second jacking hydraulic oil cylinder; 5, supporting steel;
5-1-a steel support unit; 6, bearing platform; 7-a limiting frame;
7-1-short upright post; 7-2-long upright post; 7-3-oblique connecting rod;
7-4-stiffeners; 8-connecting the beam; 9-bracket;
10-anchoring ribs; 11-temporary spacer blocks; 12-transverse fixing frame.
Detailed Description
As shown in fig. 1 to 9, the utility model discloses a steel box girder 1 and a plurality of existing main mound support systems of setting in steel box girder 1 lower part, existing main mound support system includes two existing main mounds 2, two the bottom of existing main mound 2 is provided with cushion cap 6, and the upper end of two existing main mounds 2 is provided with even tie beam 8, its characterized in that: the outer side of each existing main pier 2 is provided with a steel supporting system for supporting the steel box girder 1 and a jacking mechanism erected between the steel supporting system and the steel box girder 1, the number of the jacking mechanisms and the number of the steel supporting systems are equal to that of the existing main piers 2 and correspond to that of the existing main piers 2 one by one, the lower part of the steel box girder 1 is provided with two distribution girders 3 for the jacking mechanisms to be installed, each jacking mechanism comprises a first jacking unit and a second jacking unit, each first jacking unit comprises a plurality of first jacking hydraulic cylinders 4-1 arranged on two sides of the existing main pier 2, each first jacking hydraulic cylinder 4-2 comprises a plurality of second jacking hydraulic cylinders 4-2 arranged on two sides of the existing main pier 2, and the first jacking hydraulic cylinders 4-1 and the second jacking hydraulic cylinders 4-2 are both installed at the bottom of the distribution girders 3, the first jacking hydraulic oil cylinder 4-1 and the second jacking hydraulic oil cylinder 4-2 are distributed in a staggered mode;
the steel support system comprises a plurality of steel supports 5 anchored on a bearing platform 6, the lower parts of the first jacking hydraulic oil cylinder 4-1 and the second jacking hydraulic oil cylinder 4-2 are evenly distributed with one steel support 5, each steel support 5 comprises a plurality of steel support units 5-1, each steel support 5 corresponding to the existing main pier 2 is fixedly connected into a whole through a plurality of transverse fixing frames 12, two sides of the connecting beam 8 are respectively provided with a limiting frame 7 for limiting the steel box girder 1, and the upper end of each limiting frame 7 is fixedly connected with the steel box girder 1.
In this embodiment, before the steel box girder 1 is jacked, the upper portions of the two existing main piers 2 and the steel box girder 1 need to be cut off.
During actual use, the distribution beam 3 is arranged at the lower part of the steel box girder 1, and the first jacking hydraulic cylinder 4-1 and the second jacking hydraulic cylinder 4-2 are arranged on the distribution beam, so that the deformation cannot be forcedly superposed on the steel box girder 1 due to uneven stress generated during jacking of the steel box girder, and the condition that a bottom plate at a hollow part in the jacking process of the steel box girder 1 is not damaged due to overlarge local stress is ensured.
It should be noted that, by anchoring the steel support 5 to the bearing platform 6, the existing bearing platform 6 can be used as the reaction force foundation of the jacking mechanism, so that the reaction force foundation can be ensured to have sufficient strength and stability, and the reaction force foundation is prevented from sinking in the jacking process of the bridge.
Specially, through dividing into first jacking unit and second jacking unit with climbing mechanism, can realize the synchronous jacking in turn of first jacking unit and second jacking unit, when the jacking of first jacking unit, upwards add gradually in the lower part of second jacking unit and establish steel support unit 5-1, when the jacking of second jacking unit, upwards add gradually in the lower part of first jacking unit and establish steel support unit 5-1, make by 1 structural difference of steel box girder of jacking subside and eliminate basically, solve the uncontrolled problem that jacking bridge additional stress brought because of supporting inhomogeneous settlement, realize the continuous jacking overall process control of steel box girder, improve bridge jacking efficiency.
In the embodiment, the plurality of first jacking hydraulic oil cylinders 4-1 and the plurality of second jacking hydraulic oil cylinders 4-2 are arranged in a staggered mode, so that the jacking stability and the balance of the jacking mechanism to the bridge can be realized when the first jacking unit and the second jacking unit are alternatively and synchronously jacked.
In this embodiment, be provided with a spacing 7 respectively through the both sides at the coupling roof beam 8, can carry on spacingly to steel box girder 1 through spacing 7, can guarantee at steel box girder 1 at the in-process of jacking, the lateral displacement of steel box girder 1 is controllable, avoids the bridge to take place obvious skew or crooked, and then can effectively guarantee the security and the reliability of bridge jacking.
During actual use, the first jacking hydraulic oil cylinder 4-1 and the second jacking hydraulic oil cylinder 4-2 are both provided with balance valves, the most unfavorable condition in the bridge jacking process is that the jack suddenly loses pressure to cause the lifted bridge to incline, the whole bridge jacking is out of control, the balance valves are arranged on each first jacking hydraulic oil cylinder 4-1 and each second jacking hydraulic oil cylinder 4-2, once the power failure of a distribution box or equipment occurs, oil leakage of an oil pipe occurs, and the oil pipe oil way can be automatically closed by the balance valves, so that the pressure in the jack is ensured not to leak, and the bridge jacking process is ensured to be safely controlled.
In this embodiment, the plurality of first jacking hydraulic cylinders 4-1 are controlled by a first oil pump, and the plurality of second jacking hydraulic cylinders 4-2 are controlled by a second oil pump.
In this embodiment, after the height of each of the steel struts 5 corresponding to the existing main pier 2 reaches 2m, the steel struts are transversely connected and reinforced by a transverse fixing frame 12.
In this embodiment, a plurality of displacement sensors for measuring the jacking height of the steel box girder 1 are installed on the steel box girder 1.
In practical use, one or more displacement sensors are mounted on the steel box girder 1 at positions close to the two existing main piers 2, the displacement sensors are mounted on the lower portion of the steel box girder 1, and the displacement sensors are preferably laser ranging sensors with the model number of SLDS-A30P.
During the in-service use, through installing a plurality of displacement sensor on steel box girder 1, displacement sensor can real-time supervision steel box girder jacking in-process steel box girder 1's real-time elevation, and when the elevation error that the displacement sensor measurement of 1 both sides lower part of steel box girder was greater than the settlement error, control first oil pump and second oil pump stop the operation.
As shown in fig. 3, in the present embodiment, four steel braces 5 are respectively provided on both sides of the existing main pier 2.
During actual use, each existing main pier 2 corresponds to eight steel supports 5, meanwhile, each existing main pier 2 corresponds to 4 first jacking hydraulic oil cylinders 4-1 and 4 second jacking hydraulic oil cylinders 4-2 respectively, and the first jacking hydraulic oil cylinders 4-1 and the second jacking hydraulic oil cylinders 4-2 on each side of the existing main pier 2 are equal in number and are distributed in a staggered mode.
In this embodiment, the cylinder bodies of the first and second jacking hydraulic cylinders 4-1 and 4-2 are fixed to the lower side of the distribution beam 3, and the piston rod ends of the first and second jacking hydraulic cylinders 4-1 and 4-2 are vertically arranged downward and supported at the upper ends of the corresponding steel supports 5.
When the jacking device is actually used, the cylinder bodies of the first jacking hydraulic cylinder 4-1 and the second jacking hydraulic cylinder 4-2 are fixed on the distribution beam 3, so that the piston rod ends of the first jacking hydraulic cylinder 4-1 and the second jacking hydraulic cylinder 4-2 extend downwards to realize supporting, and the steel support 5 is convenient to increase gradually.
In this embodiment, one or more temporary spacers 11 are provided at the upper end of the steel support 5.
When the jacking device is used in practice, when the steel box girders are alternatively and synchronously jacked, the first jacking unit is jacked to a certain height gradually, one or a plurality of temporary cushion blocks 11 are supported on the steel supports 5 at the lower part of the second jacking unit step by step in the jacking process of the first jacking unit, so that the height difference problem among all supporting points is eliminated, the pore at the lower end of the second jacking unit is kept to be not more than 2cm constantly, the structural safety in the jacking process of a bridge structure is effectively ensured, and the accumulated height of the temporary cushion blocks 11 of the support cushions is slightly smaller than the single jacking height of the jacking mechanism; when the first jacking unit stops jacking, replacing a temporary cushion block 11 of a support pad on a steel support 5 at the lower part of the second jacking unit with a steel support unit 5-1, lengthening the steel support 5, extending an oil cylinder of the second jacking unit, supporting the oil cylinder on the steel support 5 at the lower part of the second jacking unit, gradually withdrawing the oil cylinder of the first jacking unit, and gradually supporting one or more temporary cushion blocks 11 at the lower part of the first jacking unit in the process of withdrawing the oil cylinder of the first jacking unit, wherein the pore at the lower end of the first jacking unit is constantly kept to be not more than 2 cm; realizing the alternate synchronous jacking of one jacking and the other supporting pad.
As shown in fig. 7 and 8, in this embodiment, the distribution beam 3 is a double-split i-beam formed by two i-beams 3-1, a plurality of stiffening ribs 3-2 are arranged on the outer sides of two flange plates of each i-beam 3-1 at equal intervals along the length direction of the i-beam, and the flange plates of the two i-beams 3-1 are welded together by a connecting plate 3-3.
During actual use, a concrete cross beam is poured inside the steel box girder 1, a door opening is sealed, then the distribution girder 3 is arranged on the lower portion of the steel box girder 1, and when the distribution girder 3 is installed, a leveling cushion block can be additionally arranged at the bottom of the steel box girder 1 so as to ensure the installation accuracy of the distribution girder 3.
In this embodiment, the stiffening ribs 3-2 are preferably Q345 steel plates with a thickness of 12mm, a width of 120mm and a height of 1200mm, the distance between two adjacent stiffening ribs 3-2 is 350mm, the stiffening ribs 3-2 are welded and fixed with two flange plates and webs of the i-steel 3-1, the stiffening ribs 3-2 are perpendicular to the two flange plates and webs of the i-steel 3-1, and the plurality of stiffening ribs 3-2 are arranged on the outer sides of the two flange plates of the i-steel 3-1 at equal intervals along the length direction of the two flange plates, so that the distribution beam 3 can have sufficient strength.
In the embodiment, the upper flange plates of the two I-beams 3-1 and the lower flange plates of the two I-beams 3-1 are connected through the connecting plates 3-3, the connecting plates 3-3 are arranged closely to the inner sides of the flange plates of the I-beams 3-1, and the connecting plates 3-3 are welded and fixed with the flange plates of the two I-beams 3-1.
In this embodiment, two adjacent steel support units 5-1 in the steel supports 5 are connected through a flange.
During practical use, two ends of the steel supporting unit 5-1 are respectively provided with a flange plate, so that bolts can be conveniently installed, the connection integrity of the plurality of steel supporting units 5-1 is further realized, and the stability and the safety of a supporting system are ensured.
As shown in fig. 4, 5 and 6, in this embodiment, the limiting frame 7 is a right trapezoid limiting frame, the limiting frame 7 includes two short columns 7-1 and two long columns 7-2, the upper ends of the short columns 7-1 and the long columns 7-2 are both welded to the lower portion of the steel box girder 1, an oblique connecting rod 7-3 is connected between the lower end of each short column 7-1 and the lower end of the long column 7-2 adjacent thereto, the two oblique connecting rods 7-3 are parallel to each other, and a plurality of stiffening rods 7-4 are connected between each short column 7-1 and the long column 7-2 adjacent thereto and between the two long columns 7-2.
During actual use, the bottom of the steel box girder 1 is anchored with a steel plate for welding the limiting frame 7, the short upright post 7-1, the long upright post 7-2 and the oblique connecting rod 7-3 are used as frameworks of the limiting frame 7, and the stiffening rod 7-4 is additionally arranged on the frameworks of the limiting frame 7, so that the whole limiting frame 7 fixed at the bottom of the girder has enough rigidity and strength in the transverse bridge direction and the longitudinal bridge direction to meet the jacking construction requirement.
In the embodiment, as shown in fig. 5, two long columns 7-2 in the limiting frame 7 are arranged near one side of the connecting beam 8, and two brackets 9 guiding the long columns 7-2 are anchored on two sides of the connecting beam 8.
During the in-service use, be provided with 5 mm's clearance between long stand 7-2 and the bracket 9, when the jacking of steel box girder 1 produced the off normal, carry on spacingly to spacing 7 through the bracket 9, utilize the rigidity of existing main mound 2 self to carry on spacingly, guarantee that superstructure does not produce the deviation, paint butter in clearance department simultaneously, reduce the frictional force between spacing 7 and the bracket 9, improve steel box girder jacking efficiency.
In this embodiment, the length of the long upright post 7-2 is greater than the jacking height of the steel box girder 1.
As shown in fig. 9, in the present embodiment, the lower portion of the steel support 5 is anchored on the bearing platform 6 by a plurality of anchoring ribs 10, and the plurality of anchoring ribs 10 are arranged on the same circumference at equal intervals.
In practical use, the length of the anchoring rib 10 is 26cm, the implantation depth is 20cm, the exposed length is 6cm, and the pulling resistance is not less than 10 kN.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.
Claims (10)
1. The utility model provides a steel box girder owner mound jacking construction structures, includes steel box girder (1) and sets up a plurality of existing main mound support systems in steel box girder (1) lower part, existing main mound support system includes two existing main mounds (2), two the bottom of existing main mound (2) is provided with cushion cap (6), and the upper end of two existing main mounds (2) is provided with even tie beam (8), its characterized in that: the steel supporting system used for supporting the steel box girder (1) and the jacking mechanisms erected between the steel supporting system and the steel box girder (1) are arranged on the outer side of each existing main pier (2), the number of the jacking mechanisms and the number of the steel supporting systems are equal to that of the existing main piers (2) and correspond to that of the existing main piers one by one, two distribution girders (3) used for installing the jacking mechanisms are arranged on the lower portion of the steel box girder (1), each jacking mechanism comprises a first jacking unit and a second jacking unit, each first jacking unit comprises a plurality of first jacking hydraulic oil cylinders (4-1) arranged on two sides of the corresponding main pier (2), each first jacking unit comprises a plurality of second hydraulic oil cylinders (4-2) arranged on two sides of the corresponding main pier (2), each first jacking hydraulic oil cylinder (4-1) and each second jacking hydraulic oil cylinder (4-2) are arranged at the bottom of each distribution girder (3), the first jacking hydraulic oil cylinder (4-1) and the second jacking hydraulic oil cylinder (4-2) are arranged in a staggered manner;
the steel support system comprises a plurality of steel supports (5) anchored on a bearing platform (6), the lower parts of a first jacking hydraulic oil cylinder (4-1) and a second jacking hydraulic oil cylinder (4-2) are respectively provided with one steel support (5), each steel support (5) comprises a plurality of steel support units (5-1), each steel support (5) corresponding to an existing main pier (2) is integrally connected through a plurality of transverse fixing frames (12) in a fastening mode, two sides of a connecting beam (8) are respectively provided with a limiting frame (7) for limiting the steel box girder (1), and the upper end of the limiting frame (7) is fixedly connected with the steel box girder (1).
2. The jacking construction structure of the main pier of the steel box girder as recited in claim 1, wherein: and a plurality of displacement sensors for measuring the jacking height of the steel box girder (1) are arranged on the steel box girder (1).
3. The jacking construction structure of the main pier of the steel box girder as recited in claim 1, wherein: and four steel supports (5) are respectively arranged on two sides of the existing main pier (2).
4. The jacking construction structure of the main pier of the steel box girder as recited in claim 1, wherein: the cylinder bodies of the first jacking hydraulic cylinder (4-1) and the second jacking hydraulic cylinder (4-2) are fixed on the lower side of the distribution beam (3), the piston rod ends of the first jacking hydraulic cylinder (4-1) and the second jacking hydraulic cylinder (4-2) are vertically arranged downwards, and the piston rod ends are supported at the upper ends of the corresponding steel supports (5).
5. The jacking construction structure of the main pier of the steel box girder as recited in claim 1, wherein: one or more temporary cushion blocks (11) are arranged at the upper end of the steel support (5).
6. The jacking construction structure of the main pier of the steel box girder as recited in claim 1, wherein: the distribution beam (3) is a double-spliced I-shaped steel formed by two I-shaped steels (3-1), a plurality of stiffening ribs (3-2) are arranged on the outer sides of two flange plates of each I-shaped steel (3-1) at equal intervals along the length direction of the I-shaped steel, and the flange plates of the two I-shaped steels (3-1) are welded into a whole through connecting plates (3-3).
7. The jacking construction structure of the main pier of the steel box girder as recited in claim 1, wherein: two adjacent steel support units (5-1) in the steel support (5) are connected through flanges.
8. The jacking construction structure of the main pier of the steel box girder as recited in claim 1, wherein: the limiting frame (7) is a right-angle trapezoid limiting frame, the limiting frame (7) comprises two short columns (7-1) and two long columns (7-2), the upper ends of the short columns (7-1) and the long columns (7-2) are welded to the lower portion of the steel box girder (1), each short column (7-1) and the lower end of the long column (7-2) adjacent to the short column are connected with one oblique connecting rod (7-3), the two oblique connecting rods (7-3) are parallel to each other, and each short column (7-1) and the long column (7-2) adjacent to the short column are connected with one another and a plurality of stiffening rods (7-4) are connected between the long columns (7-2).
9. The jacking construction structure of the main pier of the steel box girder as claimed in claim 7, wherein: two long upright posts (7-2) in the limiting frame (7) are arranged on one side close to the connecting beam (8), and brackets (9) for guiding the long upright posts (7-2) are anchored on two sides of the connecting beam (8).
10. The jacking construction structure of the main pier of the steel box girder as recited in claim 1, wherein: the lower part of the steel support (5) is anchored on the bearing platform (6) through a plurality of anchoring ribs (10), and the anchoring ribs (10) are arranged on the same circumference at equal intervals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022163765.0U CN213709232U (en) | 2020-09-27 | 2020-09-27 | Steel case roof beam owner mound jacking construction structures |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022163765.0U CN213709232U (en) | 2020-09-27 | 2020-09-27 | Steel case roof beam owner mound jacking construction structures |
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| CN213709232U true CN213709232U (en) | 2021-07-16 |
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