CN113699894A - Construction method of complicated navigation water area widening and height changing steel box girder support system - Google Patents
Construction method of complicated navigation water area widening and height changing steel box girder support system Download PDFInfo
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- CN113699894A CN113699894A CN202111136793.6A CN202111136793A CN113699894A CN 113699894 A CN113699894 A CN 113699894A CN 202111136793 A CN202111136793 A CN 202111136793A CN 113699894 A CN113699894 A CN 113699894A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/14—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact specially adapted for local protection, e.g. for bridge piers, for traffic islands
- E01F15/141—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact specially adapted for local protection, e.g. for bridge piers, for traffic islands for column or post protection
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Abstract
The invention discloses a construction method of a steel box girder support system with a variable width and a variable height in a complex navigation water area, and relates to the technical field of bridge engineering construction. The construction method comprises the steps of construction preparation, measurement paying-off, steel pipe pile construction, steel trestle construction, foundation treatment, pushing temporary support construction, assembly jig support construction, warning navigation anti-collision pile setting and support dismantling. According to the steel box girder support system, the pushing temporary pier structure and the assembling jig frame structure support are all steel pipe piles, and the steel pipe upright posts are connected through flange plate bolts to form a support system component which can be recycled, so that the construction speed is high, the operation feasibility is high, and the steel box girder support system is suitable for construction of a steel box girder support system with a complicated navigation water area widening and height increasing; the temporary buttress and the processed pavement are fixed by the embedded screw, and the embedded screw is welded with the embedded steel plate, so that the construction speed is accelerated, the construction efficiency is improved, and the construction cost is comprehensively saved by about 13% compared with the traditional construction method.
Description
Technical Field
The invention relates to the technical field of bridge engineering construction, in particular to a construction method of a support system of a steel box girder with a variable height and a variable width in a complex navigation water area, which is suitable for the support system engineering of an assembled viaduct.
Background
The viaduct is a bridge which is widely applied in the urban traffic in China, and has very important significance for the urban traffic, and the construction of the viaduct can relieve the urban road congestion phenomenon in China to a great extent. For the construction of the viaduct, the construction of the viaduct has strong technical performance, and a plurality of key technologies are provided in the construction process, and the key technologies directly relate to the quality and the performance of the bridge, so that the viaduct cannot be divided into half. The construction of the bent cap is everywhere visible in projects such as urban viaducts, and because high-altitude operation of mass concrete is involved, the safety risk in the construction process is large. Before construction, the most important link is the design and installation of a box girder supporting system, which not only considers the requirements of construction safety and entity quality, but also considers the feasibility and convenience of operation and the control of construction cost.
In the prior art, a construction method of a support system of a steel box girder, which is widened and elevated in a complicated navigation water area, is adopted, a pushing temporary pier structure needs to be constructed in a river channel and land, the bearing capacity of the support system needs to be improved, the construction efficiency of a support system of the temporary pier structure and an enlarged foundation needs to be improved, the construction efficiency of the support system construction is further improved, and the manufacturing cost is reduced.
Disclosure of Invention
The invention aims to provide a construction method of a steel box girder support system with a widened and heightened complex navigation water area, which is used for solving the technical problems that in the prior art, a pushing temporary pier structure needs to be constructed in a river channel and a land, the bearing capacity of the support system needs to be improved, the construction efficiency of a support system of the temporary pier structure and an enlarged foundation needs to be improved, the construction efficiency of the support system construction is further improved, and the manufacturing cost is reduced.
The purpose of the invention can be realized by the following technical scheme:
the construction method of the steel box girder bracket system with the variable width and the variable height of the complicated navigation water area comprises the following steps:
s1, construction preparation;
s2, measuring and paying off;
s3, constructing the steel pipe pile;
s4, constructing a steel trestle;
s5, basic processing;
s6, construction of the pushing temporary support, which specifically comprises the following steps:
s61, pushing the temporary support structure support system: the pushing temporary support is required to be provided with pushing equipment, a support upright post adopts a first steel pipe, a second steel pipe is adopted when the water level of the steel pipe pile is below 0.5 m, and the first steel pipe is adopted when the water level is above 0.5 m; longitudinal and transverse connecting steel pipes are arranged between the steel pipe upright columns to serve as longitudinal and transverse connecting systems, first distribution beams are arranged at the tops of the steel pipe upright columns, pushing equipment is arranged on the first distribution beams, and the upper steel pipe piles and the lower steel pipe piles are welded and fixed to conduct force transfer conversion;
s62, basic design of a support system of the pushing temporary support structure:
the temporary piers are positioned in the riverway, and are in a lattice column form by adopting single steel pipe upright columns, and the steel pipe upright columns are steel pipe pile foundations; the other type of temporary pier is positioned on the land, and the lattice column of the temporary pier adopts concrete to enlarge the foundation;
s63, connecting the temporary pier structure supporting system with the enlarged foundation:
the temporary buttress and the processed pavement are fixed by using a pre-embedded screw, and the pre-embedded screw is connected with a pre-embedded steel plate in a double-sided welding leg welding mode;
s7, assembling the jig frame support for construction;
s8, setting warning navigation anti-collision piles;
and S9, removing the bracket.
As a further improved scheme of the invention, the construction of assembling the jig frame support in the step S7 specifically comprises the following steps:
s71, assembling an area supporting system of the steel box girder:
all the temporary support upright columns adopt third steel pipes, longitudinal and transverse connecting steel pipes are arranged between the steel pipe upright columns as longitudinal and transverse connecting systems, the transverse connecting systems are connected with the upright columns through gusset plates, longitudinal bridge direction connecting struts are arranged in a penetrating manner, section steel is arranged on the top of the steel pipe upright columns in the transverse bridge direction as second distribution beams, Bailey beams are arranged on the second distribution beams, and second distribution beams of the section steel are arranged on the tops of the Bailey beams;
s72, designing a foundation of the bottom of the temporary pier in the assembly area:
arranging an expanded foundation with the area of 2000mm multiplied by 2000mm and the height of 1000mm at the bottom of the pushing equipment in the splicing area, and arranging reinforcing steel bars with the double-layer interval of 100mm and the diameter of 20mm in the expanded foundation when the expanded foundation is poured, so that the strength of the expanded foundation is enhanced;
s73, distribution beam: the distribution beam for assembling the steel box beam adopts H-shaped steel, and stiffening plates are added at the intervals of 800mm on the two sides of the H-shaped steel to increase the strength of the distribution beam;
s74, connecting a temporary support system.
As a further improved scheme of the invention, the connection form of the temporary support system in the step S74 is specifically as follows:
(1) the steel pipe upright posts are connected by flange plate bolts or welded, and the length of the standard section support is 9 m;
(2) the distribution beam profile steel butt joint is welded, butted and reinforced by using gusset plates, and the welding size is not less than 8 mm;
(3) the assembling area is provided with Bailey frames which are longitudinally connected through special pin shafts and transversely form a Bailey beam with the width of 900mm through a supporting frame;
(4) the Bailey frames and the lower-layer distributing beams are fixed by U-shaped fixtures, the U-shaped fixtures are welded with the lower-layer distributing beams, and the Bailey frames and the upper-layer distributing beams are fixed by horse riding bolts.
As a further improved scheme of the invention, in the step S62, an expanded foundation with the height of 1000mm is arranged at the bottom of the temporary pier structure supporting system in the pushing mode, and when the expanded foundation is poured, reinforcing steel bars with the spacing of 100mm and the diameter of 20mm are arranged in the expanded foundation, so that the strength of the expanded foundation is enhanced.
As a further improved scheme of the invention, in the step S4 of the construction of the steel trestle, duplex 40 steel is adopted for the pavement distribution beam of the steel trestle, the steel pipe piles adopt phi 630 multiplied by 8mm, the trestle width is 6m and 8m, 8 beret pieces are transversely arranged, the transverse spacing is 900 or 1150mm, and standard support frames are adopted to connect the two pieces into a whole; the bearing beam is made of I25b I-steel, the length is 8 meters, each section is transversely arranged according to 75cm, the longitudinal distribution beam is made of I25I-steel, the distance is 50cm, and 8mm steel plates are laid on the upper part of the longitudinal distribution beam; a90 KW vibration hammer is selected for the field construction of the trestle steel pipe pile, and a 50t crawler crane is adopted for hoisting.
As a further improvement of the present invention, the step S9 of detaching the bracket specifically includes the following steps:
s91, selecting the time for dismantling the bracket;
s92, support removal sequence:
(1) the whole sequence is as follows: sequentially removing the bridge span towards two sides, firstly removing the splicing area support, and then removing the pushing support;
(2) dismantling the single bracket: sequentially proceeding from top to bottom, and layering;
s93, disassembling the splicing area bracket;
adopting truck crane to cooperate with construction operation, firstly dismantling the top part matched beam, drawing out the matched beam from the side by the crane, and stabilizing the steel member by using a wave rope in the dismantling process; the bailey frames are disassembled after being divided into small sections, and the bailey frames on the inner sides of the beam bottoms are pulled straight by hand chain hoists and lifted out through the matching of truck cranes; after the vertical and horizontal connection systems of the upright columns are removed, the steel pipe upright columns are disassembled in sections; finally, taking out the embedded part from the top end of the column base;
s94, removing the pushing support;
and S95, removing the leveling bracket.
As a further improvement of the present invention, the step S94 pushing the bracket to be removed includes the following steps:
(1) dismantling a pushing device: two walking machines are arranged on a single temporary pier, firstly, a pad beam and two side placing piers on the walking machine are manually dismantled, then a temporary hanging point is arranged at the bottom of a steel beam, two chain blocks are hung, the two chain blocks are jointly stressed upwards, so that the walking machine falls off and pushes a longitudinal beam platform, one chain block is gradually loosened, the other chain block is straightened to tighten the walking machine, the walking machine is slowly lowered to the middle, and the walking machine is hoisted to the land by an automobile crane to be dismantled;
removing a single steel pipe pile by adopting a crawler crane and a vibration hammer, hoisting and conveying the single steel pipe pile to a flat ground by using a crane after the steel pipe pile is removed, removing the single steel pipe pile by 6-7 m, hoisting the single steel pipe pile to the ground, then removing the lower section of the steel pipe pile, and repeating construction until the whole steel pipe pile is removed;
(2) dismantling the ground pushing support: firstly, taking down the pushing equipment and the pier placing cushion beam by using a chain hoist, and then dismantling the stand column of the support through a truck crane;
(3) dismantling a pushing support in the river channel: according to actual site construction conditions, the vibration pile hammer is hung on the lifting hook and is completely pulled out after being sectioned and cut through the cooperation construction of a truck crane or a crawler crane.
As a further improvement of the present invention, the leveling bracket removing step S95 includes the steps of:
(1) dismantling the ground side span leveling bracket: firstly, fixing a bracket component and a steel box girder by using a chain hoist, and removing the bracket component through a truck crane after a bolt for connecting the bracket component and a bottom plate of the steel box girder is cut off;
(2) dismantling a midspan leveling bracket in the river channel: setting a round hole with the diameter of about 100mm at a proper position of the midspan steel box girder, leading a steel strand from the bridge deck of the steel box girder to a bracket at the bottom of the steel box girder, fixedly connecting the steel strand with the midspan bracket through a clamping ring lifting appliance, vertically unloading the bracket component onto a flat barge by using a winch arranged on the bridge deck after cutting off a bolt for connecting the bracket component with a bottom plate of the steel box girder, and finally hoisting and transporting the bracket component to land for disassembly through an automobile.
The invention has the following beneficial effects:
1. according to the steel box girder support system, the pushing temporary pier structure and the assembling jig frame structure support are all steel pipe piles, the steel pipe upright posts are connected through the flange plate bolts, a supporting system component capable of being recycled is formed, the construction speed is high, the operation feasibility is high, and the steel box girder support system is suitable for construction of a steel box girder support system with a complicated navigation water area widening height.
2. The pushing temporary pier structure and the assembling jig frame structure foundation are characterized in that one type of temporary pier is positioned in a river channel, and steel pipe upright columns are adopted to form a lattice column form and are used as steel pipe pile foundations; and the other type of temporary pier is positioned on land, and the latticed column adopts concrete to enlarge the foundation, so that the bearing capacity of the whole bracket system is improved, and the construction speed is accelerated.
3. The temporary pier structure supporting system is connected with the enlarged foundation, the temporary pier and the processed pavement are fixed by the embedded screw rods, and the embedded screw rods are welded with the embedded steel plates, so that the construction speed is accelerated, the construction efficiency is improved, and the construction cost is comprehensively saved by about 13% compared with the traditional construction method.
4. Through setting up navigation warning navigation anticollision stake and combining construction warning waters setting, safety warning sign, prevented support and the interim mound construction period of top push away in aquatic, boats and ships error collision top pushes away the interim mound of support, or loses power drift out of control and strike the interim mound of top push away support, has improved the boats and ships security in navigation waters during the construction.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a construction method of a complicated navigation water area widening and height changing steel box girder support system;
FIG. 2 is a schematic view of a jacking temporary pier structure of the present invention;
FIG. 3 is a cross-sectional view taken along plane A-A of FIG. 2 in accordance with the present invention;
FIG. 4 is a schematic view of the assembled jig frame structure of the present invention;
FIG. 5 is a schematic view of a supporting frame of the present invention during construction of a steel trestle;
FIG. 6 is a longitudinal schematic view of a section of a panel support arrangement of the present invention;
FIG. 7 is a schematic view of the fixing structure of the Bailey truss and the upper and lower distribution beams of the present invention;
FIG. 8 is a top view of a warning navigation crash pile of the present invention;
FIG. 9 is a front view of a warning navigation crash pile of the present invention;
FIG. 10 is an elevational schematic view of the leveling bracket of the present invention generally disposed removed;
FIG. 11 is a cross-sectional schematic view of the leveling bracket of the present invention with the general arrangement removed;
FIG. 12 is a schematic view of a first cross-leveling bracket removal process of the present invention;
FIG. 13 is a schematic view of a second cross-leveling bracket removal process of the present invention;
FIG. 14 is a schematic view of a third cross-leveling bracket removal process of the present invention;
FIG. 15 is a schematic view of a cross-leveling bracket removal process step four in the present invention.
Reference numerals: 1. a first steel pipe; 2. a second steel pipe; 3. longitudinally and transversely connecting steel pipes; 4. a first distribution beam; 5. pushing equipment; 6. a leveling bracket; 7. a third steel pipe; 8. a bailey frame; 9. a second distribution beam; 10. a crawler crane; 11. a vibratory hammer; 12. steel pipe piles; 13. a steel trestle; 14. a temporary support column; 15. a bailey frame; 16. a U-shaped fixture; 17. a riding bolt; 18. a steel box girder; 19. anti-collision steel pipe piles; 20. parallel connection of steel pipes; 21. a winch; 22. a flat top barge; 23. steel strand wires; 24. a truck crane; 25. a lower distribution beam; 26. and an upper distribution beam.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, the embodiment provides a construction method of a steel box girder support system with a widened and heightened complicated navigable water area, which includes the following steps:
s1, construction preparation, comprising the following steps:
s11, placing construction machines and materials in place, arranging a main power line and a standard power distribution cabinet according to the position of the on-site transformer, connecting the power supply, and arranging on-site illumination during night construction.
And S12, embedding and installing the temporary supports, and performing retest before hoisting to ensure that the elevation, the mileage and the pier state meet the hoisting requirements.
And S13, marking the ground survey line, and marking the section positioning line before section hoisting. And (5) entering the field in a segmented mode, determining the position requirement of the segmented field, marking, and positioning the transport vehicle according to the mark.
S14, arranging fenders and road traffic warning boards according to the plane arrangement of field hoisting.
S2, measurement and setting: and a total station lofting construction control point is adopted, the axis is accurately positioned, and the error meets the precision requirement.
S3, steel pipe pile construction: the steel pipe pile is used as the temporary pushing transition pier in the steel box girder riverway, the steel pipe pile is constructed by a cantilever guide frame method in the inserting and driving process, and when the steel pipe pile is inserted and driven, if the pile top is damaged or locally bent, the steel pipe pile is cut off and is lengthened to the designed elevation. And (5) after the steel pipe pile is inserted and driven, measuring the pile top deviation in a free state in time and recording.
S4, construction of the steel trestle: as shown in fig. 5, duplex 40 steel is adopted for the distribution beam of the temporary road of the steel trestle, phi 630 multiplied by 8mm is adopted for the steel pipe pile 12, the trestle width is 6m and 8m, 8 beret pieces are transversely arranged, the transverse distance is 900mm or 1150mm, and standard support frames are adopted to connect the trestle into a whole. The bearing beam is made of I25b I-steel, the length of the bearing beam is 8 meters, each section of the bearing beam is transversely arranged according to 75cm, the longitudinal distribution beam is made of I25I-steel, the distance between the sections of the bearing beam and the longitudinal distribution beam is 50cm, and 8mm steel plates are laid on the upper portion of the longitudinal distribution beam.
A90 KW vibration hammer 11 is selected for the field construction of the trestle steel pipe pile, and a 50t crawler crane 10 is adopted for hoisting. Inserting and drilling the crawler crane 10 section by section to the designed depth; the verticality of the steel pipe piles 12 is strictly controlled within 1% in the piling process, and after the steel pipe piles are piled in place and lengthened to the designed height, the vertical adjacent steel pipe piles 12 are welded into an integral structure through 20 # channel steel.
And S5, basic processing.
S6, pushing the temporary support for construction, as shown in figures 2-3, comprising the following steps:
s61, pushing the temporary support structure support system: as the temporary pushing support, pushing equipment 5 needs to be arranged, a first steel pipe 1 with the diameter of 800mm multiplied by 16mm is adopted as a support upright column, a second steel pipe 2 with the diameter of 800mm multiplied by 10mm is adopted when the water level of the steel pipe pile is below 0.5 m, and the first steel pipe 1 with the diameter of 800mm multiplied by 16mm is adopted when the water level is above 0.5 m. Vertical and horizontal connecting steel pipes 3 with the diameter of 273 multiplied by 7mm are arranged between the steel pipe upright columns to serve as vertical and horizontal connecting systems, first distribution beams 4 of 6I 56I-shaped steel are arranged at the tops of the steel pipe upright columns, and pushing equipment 5 is arranged on the first distribution beams 4. The upper steel pipe pile and the lower steel pipe pile are welded and fixed by I56 section steel for force transfer conversion.
S62, basic design of a support system of the pushing temporary support structure:
the supporting system foundation of the pushing temporary pier structure is divided into two types of structural forms according to the position of the temporary pier arrangement position. One type of temporary piers are positioned in a river channel, and the temporary piers are in a lattice column form by adopting a single steel pipe upright column with the diameter of 800 multiplied by 10mm, and the steel pipe upright column is a steel pipe pile foundation; the other type of temporary pier is located on the land, and the temporary pier lattice column adopts concrete to enlarge the foundation.
The bottom of the support system of the pushing temporary pier structure is provided with an expanded foundation with the height of 1000mm, and when the expanded foundation is poured, reinforcing steel bars with the interval of 100mm and the diameter of 20mm are arranged in the expanded foundation, so that the strength of the expanded foundation is enhanced.
S63, connecting the temporary pier structure supporting system with the enlarged foundation:
the temporary buttress and the processed pavement are fixed by a phi 20 multiplied by 500 pre-embedded screw, and the pre-embedded screw is connected with a pre-embedded steel plate (with the specification of 20 multiplied by 1000mm) by adopting a double-sided 8mm welding leg welding form.
S7, assembling the jig frame support for construction: as shown in fig. 4 and fig. 6-7, the method comprises the following steps:
s71, assembling an area supporting system of the steel box girder:
the temporary support upright posts 14 are all made of third steel pipes 7 with the diameter of 630 mm multiplied by 8mm, vertical and horizontal connecting steel pipes 3 with the diameter of 273 mm multiplied by 7mm are arranged between the steel pipe upright posts and are used as vertical and horizontal connecting systems, the horizontal connecting systems are connected with the upright posts through gusset plates, vertical bridge direction connecting supports are arranged in a penetrating mode, HM400 multiplied by 300 section steel is arranged on the top of the steel pipe upright posts in the horizontal bridge direction and is used as second distribution beams 9, 321 type Bailey beams are arranged on the second distribution beams 9, and HM400 multiplied by 300 section steel second distribution beams 9 are arranged on the top of the Bailey beams. The bailey frames near the midspan side are cantilevered and only used for constructing an operation platform, and do not participate in assembling and supporting.
S72, designing a foundation of the bottom of the temporary pier in the assembly area:
an expanded foundation with the area of 2000mm multiplied by 2000mm and the height of 1000mm is arranged at the bottom of the pushing equipment in the splicing area, and when the expanded foundation is poured, reinforcing steel bars with the double-layer interval of 100mm and the diameter of 20mm are arranged in the expanded foundation, so that the strength of the expanded foundation is enhanced.
S73, distribution beam: the distribution beam for assembling the steel box beam adopts HM 440X 300H-shaped steel, and reinforcing plates are added at the interval of 800mm on two sides of the H-shaped steel to increase the strength of the distribution beam.
S74, connecting a temporary support system:
(1) the steel pipe stand adopts flange bolted connection or welded connection, and standard section support length is 9 m.
(2) The distribution beam HM 440X 300 section steel butt joint is welded, butted and reinforced by using the gusset plates, and the welding size is not less than 8 mm.
(3) Bailey frames 8 are arranged in the assembly area, are longitudinally connected through special pin shafts, and transversely form a Bailey beam with the width of 900mm through a support frame.
(4) The Bailey frames 8 and the lower-layer distribution beams 25 are fixed by U-shaped fixtures 16, the U-shaped fixtures 16 are welded with the lower-layer distribution beams 26, and the Bailey frames 8 and the upper-layer distribution beams 26 are fixed by horse-riding bolts 17.
S8, setting warning navigation anti-collision piles;
s9, dismantling the bracket:
s91, selecting the support dismantling time:
the steel box girder is positioned, installed, welded and detected, so that the design requirement is met; when the whole bridge linearity is measured and checked, the data of the measurement detection point should meet the design and specification requirements, and the measurement data is signed and confirmed by a supervision engineer so that the next procedure of support dismantling can be carried out.
S92, support removal sequence:
(1) the whole sequence is as follows: sequentially removing the bridge span towards two sides, firstly removing the splicing area support, and then removing the pushing support;
(2) dismantling the single bracket: sequentially proceeding from top to bottom, and layering;
s93, dismantling the splicing area support:
adopting truck crane to cooperate with construction operation, firstly dismantling the top part matched beam, drawing out the matched beam from the side by the crane, and stabilizing the steel member by using a wave rope in the dismantling process; the bailey frames are disassembled after being divided into small sections, and the bailey frames on the inner sides of the beam bottoms are pulled straight by hand chain hoists and lifted out through the matching of truck cranes; after the vertical and horizontal connection systems of the upright columns are removed, the steel pipe upright columns are disassembled in sections; and finally, taking out the embedded part from the top end of the blasting column base.
S94, removing the pushing support:
(1) dismantling a pushing device: the method is characterized in that two walking machines are arranged on a single temporary pier, firstly, a pad beam and two side placing piers on the walking machine are manually detached, then a temporary hanging point is arranged at the bottom of a steel beam, two chain blocks are hung, the two chain blocks are jointly stressed upwards, the walking machine falls off and pushes a longitudinal beam platform, one chain block is gradually loosened, the other chain block is used for straightening and tensioning the walking machine, the walking machine is slowly placed in the air, and the walking machine is lifted to the land by an automobile crane to be detached.
A single steel pipe pile adopts a crawler crane and a vibration hammer to pull out the steel pipe pile, the steel pipe pile is lifted and transported to the flat ground by a crane after being pulled out, the single steel pipe pile is pulled out by 6-7 m to be cut off, the steel pipe pile is lifted and transported to the ground, the lower section is pulled out, and the construction is repeated until the whole steel pipe pile is pulled out.
(2) Dismantling the ground pushing support: firstly, taking down the pushing equipment and the pier placing cushion beam by using a chain hoist, and then dismantling the stand column of the support through a truck crane;
(3) dismantling a pushing support in the river channel: according to actual site construction conditions, the demolition occasion avoids the flood season, and the pile vibrating hammer is hung on the lifting hook and is completely pulled out after being sectioned and cut through the cooperation of the truck crane or the crawler crane. The underwater steel pipe pile is dismantled, and the crawler crane needs to stand on the steel trestle for construction.
S95, as shown in fig. 10-11, the leveling bracket 6 is removed:
(1) dismantling the ground side span leveling bracket: firstly, fixing the bracket component and the steel box girder 18 by using a chain hoist, and removing the bracket component through a truck crane 24 after cutting off a bolt for connecting the bracket component and a bottom plate of the steel box girder 18;
(2) dismantling a midspan leveling bracket in the river channel: round holes with the diameter of about 100mm are arranged at proper positions (the longitudinal distance between the bridges is 10 meters) of the mid-span steel box girder 18, steel strands 23 are led from the bridge deck of the steel box girder 18 to brackets at the bottom of the steel box girder 18, the steel strands 23 are fixedly connected with the mid-span brackets through snap ring lifting appliances, after bolts for connecting the bracket parts and the bottom plate of the steel box girder 18 are cut off, the bracket parts are vertically unloaded onto a flat barge 22 by using a winch 21 arranged on the bridge deck, and finally the bracket parts are lifted to land through an automobile crane 24 to be decomposed and disassembled.
Example 2
As shown in fig. 5, the present embodiment provides a specific installation process of steel trestle 13 construction, which includes the following steps:
s41, reinforcing the steel pipe pile 12: after the construction of the steel pipe pile 12 is completed, reinforcing construction is carried out so as to stabilize the pile sinking foundation and ensure the quality of the pile sinking. The reinforcement among the piles is realized by welding steel members such as horizontal connection, inclined connection and the like by adopting the crawler crane 10, and after the pile top forms an operation platform, welding reinforcement such as a pile top steel plate, a bracket and the like is carried out on the platform.
S42, pile top treatment and lower beam installation: a steel plate with the size of 1m multiplied by 1m and the thickness of 10mm is placed on the pile top and is welded with the pipe pile firmly, and the steel plate is guaranteed to be stressed stably. The double-splicer 40b I-steel is welded and fixed on the pile top steel plate, and the position is ensured to be correct.
S43, mounting the Bailey beam: and (3) splicing the Bailey beams into a single-layer double-row combination on the rear field according to the bent frame spacing, connecting the Bailey beams by using Bailey flower stands, and transporting the flat car to an installation site. And measuring and releasing an installation position line on the main cross beam, and hoisting the Bailey truss beam in place by using a 50t crawler crane 10, wherein the deviation is not more than 5 cm. Three groups of Bailey truss beams, two groups of Bailey frames with two splicing and a group of Bailey frames with three splicing are arranged on the cross section of the trestle. And the bailey beams are connected into a whole by using an angle 75 as an inclined strut between groups.
S44, mounting an I-shaped steel distribution beam: i-steel is firstly processed according to the design size on a land platform, then is installed by a crawler crane, is immediately reinforced and welded by a U-shaped fixture after being hoisted, and needs to be paid off on a bailey sheet to ensure accurate spacing.
S45, mounting a surface layer structure: the steel plate is mounted on the i-beam distribution beam by a 50t crawler crane 10 and welded with the lower part of the i-beam distribution beam, so that the i-beam distribution beam and the steel plate form a whole without sliding.
S46, installing a railing and auxiliary structures: considering that a 50t crawler crane 10 works on a trestle and the height of a chassis of the crawler crane is 1.1m, the height of a railing of the trestle is set to be 1.2m, steel pipes with the diameter of 48 multiplied by 3.5mm are adopted for welding, the distance between upright columns is 1.5m, the railing is welded on an embedded part of a panel, and railings are uniformly coated with red and white paint and are alternately arranged.
The cable and other laying brackets are welded on side embedded parts of the panel by angle 50 angle steel, and facilities such as main cables, water delivery pipes and the like are laid on the side embedded parts, so that the interference to traffic is reduced.
The trestle is provided with a vehicle speed-limiting driving warning board and a vehicle weight-limiting sign board at intervals. Street lamps are alternately arranged on two sides of the trestle every 15m for night illumination.
Example 3
The embodiment provides a processing flow of basic processing, which includes the following steps:
s51, ground temporary support foundation treatment: leveling an idle area of a temporary pier position, rolling and compacting by using a road roller, releasing the center position of a support, excavating to the depth of 100cm from the periphery along the center position, adjusting the excavation size area according to the enlarged foundation floor area at the bottom of the support, detecting the bearing capacity of a foundation by using a static sounding method, filling sand gravel or brick slag with the thickness of 80cm if the bearing capacity of the foundation is more than or equal to 85KPa, compacting to 80KPa, pouring a C30 concrete cushion layer with the thickness of 20cm on the top surface of the concrete cushion layer, or pouring building garbage and crushed stone to be used as surface water for leveling and sealing.
S52, treating the foundation of the steel box girder construction pavement: leveling a construction sidewalk area, then rolling and compacting by using a road roller, discharging the center position of a sidewalk, excavating to the depth of 150cm from the periphery along the center position, adjusting the excavation size area according to the floor area of the construction sidewalk, detecting the bearing capacity of a foundation by using a static sounding method, if the bearing capacity of the foundation is more than or equal to 85KPa, replacing and filling sand gravel or brick slag with the thickness of 120cm, compacting to 160KPa in two layers, pouring a C30 concrete cushion layer with the thickness of 30cm on the top surface of the concrete cushion layer, or pouring construction waste and broken stones to be used as surface water for leveling and sealing.
S53, carrying out foundation treatment on the steel box girder crane station area: leveling a hoisting area, rolling and compacting by using a road roller, releasing the central position of the hoisting area, excavating to the depth of 200cm from the periphery along the central position, adjusting the excavation size area according to the floor area of the hoisting area, detecting the bearing capacity of a foundation by using a static sounding method, filling 150 cm-thick sand gravel or brick slag in a replacement manner if the bearing capacity of the foundation is more than or equal to 85KPa, compacting to 400KPa in four layers, pouring a 50 cm-thick C30 concrete cushion layer on the top surface of the concrete cushion layer, or adopting building garbage and broken stones to be used as surface water for leveling and sealing.
Example 4
The embodiment provides a setting method of a warning navigation anti-collision pile, which comprises the following steps:
(1) as shown in fig. 8-9, warning navigation anti-collision piles are arranged on both sides of the upstream and downstream of the temporary pier at the position of the navigation hole, each anti-collision steel pipe pile is designed into three anti-collision steel pipe piles 19 with phi 800 × 16mm, the anti-collision steel pipe piles 19 are driven into a riverbed (the depth of the steel pipe piles is 15 meters) in an equilateral triangle mode according to the interval of 3m, the current exposed water surface is 2.5m, and the three anti-collision steel pipe piles 19 are integrally formed through parallel steel pipes 20 to serve as the navigation warning navigation anti-collision piles.
(2) And setting a construction warning water area as a navigation aid mark and a safety warning mark in a navigation section in a certain range of the upstream and downstream of the water area occupied by construction activities.
(3) The steel pipe pile facing the ship surface, with each point exposed out of the water surface, is provided with a warning sign, the pile top is provided with a flashing lamp to prevent ship collision, and the steel pipe pile of the temporary support in the water is provided with a reflective film and a warning lamp to increase the structural identification degree and remind passing ships to pay attention to avoiding; during construction, special persons are arranged on the upstream and downstream of a construction water area to remind passing ships of paying attention to danger, and daily maintenance work of safety warning signs is well done.
Example 5
As shown in fig. 10-15, the present embodiment provides a mid-span leveling bracket removal procedure comprising the steps of:
the method comprises the following steps: arranging a winch 21 on the bridge deck of the steel box girder 18, drawing a steel strand 23 to the leveling bracket 6 to be bound and fixed with the steel strand, removing the connection between the steel box girder 18 and the leveling bracket 6, moving the flat top barge 22 to a corresponding position, vertically dropping the middle bracket onto the flat top barge 22 after all procedures are checked to be qualified;
step two: according to the sequence of the first step, symmetrically removing the leveling brackets 6 at the two sides;
step three: according to the sequence of the first step, symmetrically removing the rest leveling brackets 6 on the two sides in sequence;
step four: and (5) lowering the leveling brackets 6 at the two sides to a certain height according to the sequence of the first step, and hoisting the leveling brackets 6 to the land by using a truck crane 24 for dismantling.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. The construction method of the steel box girder bracket system with the variable width and the variable height of the complicated navigation water area is characterized by comprising the following steps of:
s1, construction preparation;
s2, measuring and paying off;
s3, constructing the steel pipe pile;
s4, constructing a steel trestle;
s5, basic processing;
s6, construction of the pushing temporary support, which specifically comprises the following steps:
s61, pushing the temporary support structure support system: the pushing temporary support is required to be provided with pushing equipment, a support upright post adopts a first steel pipe, a second steel pipe is adopted when the water level of the steel pipe pile is below 0.5 m, and the first steel pipe is adopted when the water level is above 0.5 m; longitudinal and transverse connecting steel pipes are arranged between the steel pipe upright columns to serve as longitudinal and transverse connecting systems, first distribution beams are arranged at the tops of the steel pipe upright columns, pushing equipment is arranged on the first distribution beams, and the upper steel pipe piles and the lower steel pipe piles are welded and fixed to conduct force transfer conversion;
s62, basic design of a support system of the pushing temporary support structure:
the temporary piers are positioned in the riverway, and are in a lattice column form by adopting single steel pipe upright columns, and the steel pipe upright columns are steel pipe pile foundations; the other type of temporary pier is positioned on the land, and the lattice column of the temporary pier adopts concrete to enlarge the foundation;
s63, connecting the temporary pier structure supporting system with the enlarged foundation:
the temporary buttress and the processed pavement are fixed by using a pre-embedded screw, and the pre-embedded screw is connected with a pre-embedded steel plate in a double-sided welding leg welding mode;
s7, assembling the jig frame support for construction;
s8, setting warning navigation anti-collision piles;
and S9, removing the bracket.
2. The construction method of the complicated navigable water area widening and height changing steel box girder support system as claimed in claim 1, wherein the step S7 of assembling the jig frame support specifically comprises the following steps:
s71, assembling an area supporting system of the steel box girder:
all the temporary support upright columns adopt third steel pipes, longitudinal and transverse connecting steel pipes are arranged between the steel pipe upright columns as longitudinal and transverse connecting systems, the transverse connecting systems are connected with the upright columns through gusset plates, longitudinal bridge direction connecting struts are arranged in a penetrating manner, section steel is arranged on the top of the steel pipe upright columns in the transverse bridge direction as second distribution beams, Bailey beams are arranged on the second distribution beams, and second distribution beams of the section steel are arranged on the tops of the Bailey beams;
s72, designing a foundation of the bottom of the temporary pier in the assembly area:
arranging an expanded foundation with the area of 2000mm multiplied by 2000mm and the height of 1000mm at the bottom of the pushing equipment in the splicing area, and arranging reinforcing steel bars with the double-layer interval of 100mm and the diameter of 20mm in the expanded foundation when the expanded foundation is poured, so that the strength of the expanded foundation is enhanced;
s73, distribution beam: the distribution beam for assembling the steel box beam adopts H-shaped steel, and stiffening plates are added at the intervals of 800mm on the two sides of the H-shaped steel to increase the strength of the distribution beam;
s74, connecting a temporary support system.
3. The construction method of the complicated navigable water area widening and height changing steel box girder support system as claimed in claim 2, wherein the step S74 temporary support system is connected in a form of:
(1) the steel pipe upright posts are connected by flange plate bolts or welded, and the length of the standard section support is 9 m;
(2) the distribution beam profile steel butt joint is welded, butted and reinforced by using gusset plates, and the welding size is not less than 8 mm;
(3) the assembling area is provided with Bailey frames which are longitudinally connected through special pin shafts and transversely form a Bailey beam with the width of 900mm through a supporting frame;
(4) the Bailey frames and the lower-layer distributing beams are fixed by U-shaped fixtures, the U-shaped fixtures are welded with the lower-layer distributing beams, and the Bailey frames and the upper-layer distributing beams are fixed by horse riding bolts.
4. The construction method of the complicated navigable water area widening and heightening steel box girder support system according to claim 1, characterized in that in the step S62, an enlarged foundation with a height of 1000mm is set at the bottom of the pushing temporary pier structure support system, and when the enlarged foundation is poured, reinforcing steel bars with a spacing of 100mm and a diameter of 20mm are arranged in the enlarged foundation to enhance the strength of the enlarged foundation.
5. The construction method of the complicated navigable water area widening and heightening steel box girder support system according to claim 1, characterized in that in the step S4 steel trestle construction, duplex 40 steel is adopted for the steel trestle pavement distribution beam, phi 630 x 8mm is adopted for the steel pipe pile, the trestle width is 6m and 8m, 8 berley pieces are transversely arranged, 900 or 1150mm are transversely arranged, and standard support frames are adopted to connect into a whole; the bearing beam is made of I25b I-steel, the length is 8 meters, each section is transversely arranged according to 75cm, the longitudinal distribution beam is made of I25I-steel, the distance is 50cm, and 8mm steel plates are laid on the upper part of the longitudinal distribution beam; a90 KW vibration hammer is selected for the field construction of the trestle steel pipe pile, and a 50t crawler crane is adopted for hoisting.
6. The construction method of the complicated navigable water area widening and height changing steel box girder support system according to claim 1, wherein the support dismantling step S9 specifically comprises the following steps:
s91, selecting the time for dismantling the bracket;
s92, support removal sequence:
(1) the whole sequence is as follows: sequentially removing the bridge span towards two sides, firstly removing the splicing area support, and then removing the pushing support;
(2) dismantling the single bracket: sequentially proceeding from top to bottom, and layering;
s93, disassembling the splicing area bracket;
adopting truck crane to cooperate with construction operation, firstly dismantling the top part matched beam, drawing out the matched beam from the side by the crane, and stabilizing the steel member by using a wave rope in the dismantling process; the bailey frames are disassembled after being divided into small sections, and the bailey frames on the inner sides of the beam bottoms are pulled straight by hand chain hoists and lifted out through the matching of truck cranes; after the vertical and horizontal connection systems of the upright columns are removed, the steel pipe upright columns are disassembled in sections; finally, taking out the embedded part from the top end of the column base;
s94, removing the pushing support;
and S95, removing the leveling bracket.
7. The construction method of the complicated navigable water area widening and height-changing steel box girder bracket system according to claim 6, wherein the step S94 pushing bracket dismantling comprises the following steps:
(1) dismantling a pushing device: two walking machines are arranged on a single temporary pier, firstly, a pad beam and two side placing piers on the walking machine are manually dismantled, then a temporary hanging point is arranged at the bottom of a steel beam, two chain blocks are hung, the two chain blocks are jointly stressed upwards, so that the walking machine falls off and pushes a longitudinal beam platform, one chain block is gradually loosened, the other chain block is straightened to tighten the walking machine, the walking machine is slowly lowered to the middle, and the walking machine is hoisted to the land by an automobile crane to be dismantled;
removing a single steel pipe pile by adopting a crawler crane and a vibration hammer, hoisting and conveying the single steel pipe pile to a flat ground by using a crane after the steel pipe pile is removed, removing the single steel pipe pile by 6-7 m, hoisting the single steel pipe pile to the ground, then removing the lower section of the steel pipe pile, and repeating construction until the whole steel pipe pile is removed;
(2) dismantling the ground pushing support: firstly, taking down the pushing equipment and the pier placing cushion beam by using a chain hoist, and then dismantling the stand column of the support through a truck crane;
(3) dismantling a pushing support in the river channel: according to actual site construction conditions, the vibration pile hammer is hung on the lifting hook and is completely pulled out after being sectioned and cut through the cooperation construction of a truck crane or a crawler crane.
8. The method for constructing a complicated navigable water area widening and heightening steel box girder bracket system according to claim 6, wherein the step S95 leveling bracket dismantling comprises the steps of:
(1) dismantling the ground side span leveling bracket: firstly, fixing a bracket component and a steel box girder by using a chain hoist, and removing the bracket component through a truck crane after a bolt for connecting the bracket component and a bottom plate of the steel box girder is cut off;
(2) dismantling a midspan leveling bracket in the river channel: setting a round hole with the diameter of about 100mm at a proper position of the midspan steel box girder, leading a steel strand from the bridge deck of the steel box girder to a bracket at the bottom of the steel box girder, fixedly connecting the steel strand with the midspan bracket through a clamping ring lifting appliance, vertically unloading the bracket component onto a flat barge by using a winch arranged on the bridge deck after cutting off a bolt for connecting the bracket component with a bottom plate of the steel box girder, and finally hoisting and transporting the bracket component to land for disassembly through an automobile.
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