CN112411391A - Single-column capping beam steel pipe column Bailey beam construction supporting system and construction method thereof - Google Patents
Single-column capping beam steel pipe column Bailey beam construction supporting system and construction method thereof Download PDFInfo
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- CN112411391A CN112411391A CN202011374445.8A CN202011374445A CN112411391A CN 112411391 A CN112411391 A CN 112411391A CN 202011374445 A CN202011374445 A CN 202011374445A CN 112411391 A CN112411391 A CN 112411391A
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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Description
Technical Field
The invention belongs to a support system for single-column capping beam construction in highway, municipal and railway bridge construction, and particularly relates to a single-column capping beam steel pipe column Bailey beam construction support system and a construction method thereof.
Background
In the construction of highways, railways and municipal roads and bridges, the construction of single-column capping beams is often encountered in order to optimize the lower building space or reduce the water-resistance ratio of a river channel and the like. The capping beam refers to a cross beam provided on the top of the bent pier to support, distribute and transfer the load of the superstructure.
The traditional bent cap mainly adopts multi-column forms such as double columns, three columns and the like, the number of single-column bent caps is small, and the conventional bent cap construction method mostly adopts a core rod penetrating method, a hoop method and a full framing method. The construction methods have certain disadvantages to the construction of the single-column bent cap, such as: the core rod penetrating method and the hoop method cannot form an effective supporting system on the single column; the reservation and recovery of the core rod on the pier stud have certain influence on the quality of the pier stud; the hoop method is not easy to reinforce on the square column and has the risk of slipping; the full-space support is slow in erection speed and high in requirement on foundation bearing capacity, if the full-space support is constructed in a river channel, the foundation is easy to sink after being soaked by water, the risk of overall instability of the support exists, and the full-space support needs a certain period for prepressing.
Disclosure of Invention
The invention aims to provide a single-column capping beam steel pipe column Bailey beam construction supporting system and a construction method thereof, which can quickly and safely provide a concrete construction supporting platform in single-column capping beam construction.
A construction supporting system for a bailey beam of a single-column bent cap steel pipe column comprises a support foundation, a supporting system for supporting the concrete load of the bent cap, a bent cap shaping steel formwork located above the supporting system, and a bent cap arranged above the bent cap shaping steel formwork;
the support foundation comprises a pile foundation and a bearing platform positioned on the pile foundation;
a pier column is arranged on the bearing platform;
the support system sequentially comprises a steel pipe column, a movable head, a distribution beam, a Bailey beam and a main beam from bottom to top, wherein the movable head is connected with the steel pipe column through a flange plate, the distribution beam is connected with the top surface of the movable head, the Bailey beam is arranged above the distribution beam, is abutted against the pier column and is used for preventing the Bailey beam from being horizontally unstable inwards, is arranged on the outer side of the pier column and is oppositely pulled through the Bailey beam to a pull rod horizontally and is used for preventing the Bailey beam from being horizontally unstable outwards, the main beam is arranged above the Bailey beam, and the main beam stretches across the Bailey beam;
the bent cap design steel form set up in girder top, the steel-pipe column adopts the ring flange to pass through pre-buried connecting piece vertical fixing on the cushion cap, the bracing with the steel-pipe column is connected, through the bracing staple bolt draw bar with the pier stud is to drawing the formation wholly, will the bracing with the pier stud is fixed.
The steel pipe column comprises standard sections with different lengths, the steel pipe columns are connected through flanges, the inclined struts are welded with the steel pipe columns in the longitudinal direction and the transverse direction, the inclined strut hoops are used for oppositely pulling the pull rods on two sides of the pier column, and the inclined struts are erected in a Z shape or an X shape.
The Bailey beam and the distribution beam are locked firmly by adopting U-shaped bolts and are used for preventing the Bailey beam from sliding.
The steel pipe column is erected in a plane where a vertical section at the position of a Bailey beam node is located, the Bailey beam is composed of at least two Bailey pieces, a plurality of Bailey pieces form a Bailey beam, the Bailey pieces are connected through pins, and each Bailey beam is connected through a flower stand. The shearing resistance at the node of the Bailey beam is the maximum.
The inclined strut comprises a horizontal strut and a steel pipe column inclined strut, and the horizontal strut comprises a horizontal strut directly welded with the steel pipe column and a horizontal strut connected with the pier column.
And a protective layer is arranged between the horizontal support connected with the pier stud and is any one of cotton felt, geotextile, rubber pad and felt. The protective layer is used for preventing to lead to the fact destruction to the pier stud after the horizontal brace atress that links to each other with the pier stud.
The center distance of the steel pipe column is greater than or equal to 0.5m at the edge of the bearing platform, a steel pipe support is arranged on the periphery of the pier column, the steel pipe support is used for preventing the horizontal support connected with the pier column from sliding downwards, the steel pipe support at least comprises four vertical steel pipes, the vertical steel pipes are uniformly distributed on the periphery of the pier column, support supporting rods which are connected with each other through steel pipes arranged transversely and/or obliquely are arranged between the vertical steel pipes and used for fixing and lifting the horizontal support connected with the pier column, the lower end of the steel pipe support is supported and arranged on the bearing platform, and the support supporting rods are erected below the horizontal support connected with the pier column.
A construction method of a single-column bent cap steel pipe column Bailey beam construction supporting system,
firstly, piling at a design position, arranging the pile foundation with the bearing platform, arranging the pier stud on the bearing platform, arranging a pre-embedded connecting piece at the joint of the bearing platform and the steel pipe column, pre-embedding the pre-embedded connecting piece before pouring concrete on the bearing platform, and accurately embedding the pre-embedded position;
determining and installing the position of a steel pipe column, wherein the steel pipe column is composed of standard sections with different lengths, the length of the steel pipe column can be adjusted, the selected standard sections are spliced by flanges on the ground and fixed by bolts to form the steel pipe column with the length meeting the design requirement, a plurality of steel pipe columns are arranged on two sides of the pier column in parallel, the steel pipe columns are sequentially hoisted in place by a crane, the center of each steel pipe column is at a certain distance from the edge of the bearing platform, the position of each steel pipe column is determined by combining the nodes of the Bailey beams, the steel pipe columns are fixed on the bearing platform by adopting pre-embedded connecting pieces, the steel pipe columns are connected by flanges, and the center distance between the steel pipe columns and the edge of the bearing platform is not less than 0.5 m;
step three, manufacturing and installing an inclined strut, welding the inclined strut and the steel pipe column to form a whole, oppositely pulling the inclined strut and the pier column to form a whole through an inclined strut hoop opposite pull rod, welding the inclined strut and the steel pipe column in two directions of vertical and horizontal, oppositely pulling the inclined strut hoop opposite pull rod on two sides of a pier column body, fixing the inclined strut and the pier column, arranging a plurality of inclined struts in any one of Z-shaped and X-shaped erection, arranging a horizontal strut and the inclined strut, wherein the inclined strut comprises a horizontal strut directly welded with the steel pipe column and a horizontal strut connected with the pier column, arranging a protective layer between the horizontal strut connected with the pier column and the pier column, the protective layer is any one of cotton felt, geotextile, rubber mat and felt, and is used for preventing the horizontal strut connected with the pier column from being damaged after being stressed, the steel pipe support is arranged on the periphery of the pier stud and used for preventing the horizontal support connected with the pier stud from sliding downwards, the steel pipe support at least comprises four vertical steel pipes, the vertical steel pipes are uniformly distributed along the periphery of the pier stud, support rods which are connected with each other through the steel pipes arranged transversely and/or obliquely are arranged between the vertical steel pipes, each support rod is used for fixing and lifting the horizontal support connected with the pier stud, the lower end of the steel pipe support is supported and arranged on the bearing platform, and the transverse support rod is erected below the horizontal support connected with the pier stud;
step four, mounting a movable joint, wherein the movable joint is connected with the steel pipe column through a flange plate, the height of the movable joint is adjustable up and down, and when the height of the top surface of the movable joint is determined, the movable joint can be combined with a cross slope of the capping beam, and the capping beam is structurally subjected to slope finding through the elevation of the top surface of the movable joint;
step five, installing a distribution beam, wherein the distribution beam is arranged above the movable head and is connected with a top steel plate of the movable head through spot welding, so that the distribution beam is prevented from moving, the length of the distribution beam is determined by combining the plane position of the Bailey beam, and the Bailey beam can fall on the distribution beam; the problem that the bearing platform cannot be erected just below the Bailey beam due to insufficient size of the bearing platform can be solved by using the length of the distribution beam;
step six, installing a Bailey beam, installing the Bailey beam, wherein the Bailey beam consists of at least two Bailey sheets, a plurality of Bailey sheets form a Bailey beam, splicing the Bailey sheets into the Bailey beam on the ground, sequentially hoisting the Bailey beam in place, the Bailey beam is arranged above the distribution beam, the Bailey beam and the distribution beam are firmly locked by adopting U-shaped bolts to prevent the Bailey beam from sliding, the Bailey beam is tightly close to the pier stud to prevent the Bailey beam from being horizontally unstable inwards, the Bailey beam is arranged outside the pier stud, the Bailey beam is horizontally pulled in a pair manner through a Bailey beam pair pull rod to prevent the Bailey beam from being horizontally unstable outwards, the Bailey sheets are connected by pins, and each Bailey beam is connected by a flower stand;
step seven, installing a main beam, wherein the main beam is arranged above the Bailey beam, the main beam crosses the Bailey beam, the length of the main beam is determined by combining the capping beam operation platform, and the operation platform, the safety protection net and the personnel upper and lower channels are installed immediately after the main beam is installed;
eighthly, placing the bent cap shaping steel template above the main beam, customizing the bent cap shaping steel template by a manufacturer, adopting a 5mm steel template, reinforcing a back rib of the shaping steel template by adopting channel steel and I-shaped steel, and reinforcing the back rib by oppositely pulling and finish rolling deformed steel;
pouring cover beam concrete, stretching prestressed tendons according to design requirements, dismantling the steel pipe column and the Bailey beam after stretching, dismantling by utilizing matching of jacks during dismantling, slightly jacking each movable head by using two jacks, unloading the pins of the fixed movable heads, pulling out the pins of the fixed movable heads by the jacking height, falling back by about 3cm by using the jacks, fixing the movable heads, and repeatedly performing repeated operation to realize frame falling.
The steel pipe column is erected in a plane where a vertical section at the Bailey beam node is located. The shearing resistance at the node of the Bailey beam is the maximum.
The invention has the advantages and positive effects that: by adopting the technical scheme, the pier column and the bearing platform are utilized to reduce the cost of foundation treatment, the bearing capacity of the foundation is reliable, and the foundation basically cannot sink under the condition that the foundation is soaked in the river water level; the bearing platform can be regarded as a rigid foundation, has no foundation settlement, can not pre-press the support, and saves the pre-pressing time of the support; the adjustable head is used for adjusting the elevation of the pier stud, so that the elevation of the bracket system is more convenient to adjust and disassemble; the problem that the axial positions of the Bailey beam and the steel pipe column are not uniform can be solved due to the length change of the distribution beam; the bending resistance of the Bailey beam is strong, and the bending resistance advantage of the Bailey beam can be fully exerted; the steel pipe column Bailey beam supporting system is tightly connected with the pier column, and the overall stability of the supporting system is improved.
Drawings
FIG. 1 is a schematic front view of a construction supporting system of a single-column bent cap steel pipe column Bailey beam;
fig. 2 is a left side view schematic diagram of a single-column capping beam steel pipe column Bailey beam construction supporting system.
In the figure:
1. a steel pipe column 2, an inclined strut 3, an inclined strut clasping a counter pull rod 4 and a loose head
5. A distribution beam, 6, a Bailey beam, 7, a Bailey beam horizontal opposite pull rod, 8, a main beam,
9. a capping beam shaping steel template, 10, a capping beam, 11, a pier stud, 12 and a bearing platform,
13. a steel pipe bracket for supporting the horizontal support, 14 and a pile foundation.
Detailed Description
The invention is further described with reference to fig. 1, fig. 2 and the following detailed description.
A construction supporting system for a single-column bent cap steel pipe column Bailey beam comprises a support foundation, a supporting system for supporting the concrete load of the bent cap, a bent cap shaping steel template 9 positioned above the supporting system, and a bent cap 10 positioned above the bent cap shaping steel template 9;
the support foundation comprises a pile foundation 14 and a bearing platform 12 positioned on the pile foundation 14;
a pier column 11 is arranged on the bearing platform 12;
the support system sequentially comprises a steel pipe column 1, a movable head 4, a distribution beam 5, a Bailey beam 6 and a main beam 8 from bottom to top, wherein the movable head 4 is connected with the steel pipe column 1 through a flange, the distribution beam 5 is connected with the top surface of the movable head 4, the Bailey beam 6 is arranged above the distribution beam 5, the Bailey beam 6 is abutted against the pier stud 11 and used for preventing the Bailey beam 6 from being horizontally unstable inwards, the Bailey beam 6 is arranged on the outer side of the pier stud 11 and is oppositely pulled through a Bailey beam 6 and a horizontal opposite pull rod 7 of the Bailey beam 6 and used for preventing the Bailey beam 6 from being horizontally unstable outwards, the main beam 8 is arranged above the Bailey beam 6, and the main beam 8 crosses the Bailey beam 6;
bent cap design steel form 9 set up in 8 tops of girder, steel-pipe column 1 adopts the ring flange to pass through the vertical fixing of pre-buried connecting piece on cushion cap 12, pre-buried connecting piece is used for fixing with spacing, pre-buried connecting piece can adopt rag bolt or contain connecting pieces such as rag bolt's ring flange, this embodiment pre-buried connecting piece chooses for use the ring flange that contains rag bolt, bracing 2 with steel-pipe column 1 is connected, through the bracing staple bolt to pull rod 3 with pier stud 11 is to drawing wholly, will bracing 2 with pier stud 11 is fixed.
The steel pipe column 1 is composed of standard sections with different lengths, the steel pipe columns 1 are connected through flanges, the inclined strut 2 is made of channel steel or I-shaped steel, the inclined strut 2 is made of channel steel in the embodiment, the inclined strut 2 and the steel pipe columns 1 are welded in the longitudinal direction and the transverse direction, and the inclined strut hoops are used for oppositely pulling the pull rods 3 on two sides of the pier column 11.
The inclined strut 2 is in any one of Z-shaped and X-shaped erection. The diagonal brace 2 selected in this embodiment is laid in a zigzag shape.
The Bailey beam 6 and the distribution beam 5 are locked firmly by adopting U-shaped bolts and are used for preventing the Bailey beam 6 from sliding.
The steel pipe column 1 is erected in a plane where a vertical section at the node of the Bailey beam 6 is located. The shearing resistance of the nodes of the Bailey beams 6 is the maximum.
The bailey beams 6 are composed of at least two bailey pieces, a plurality of bailey pieces form one bailey beam, in the embodiment, four bailey pieces form one bailey beam 6, three bailey beams 6 form one bailey beam, the bailey pieces are connected through pins, and each bailey beam 6 is connected through a flower stand.
The inclined strut 2 comprises a horizontal strut and a steel pipe column inclined strut, and the horizontal strut comprises a horizontal strut directly welded with the steel pipe column and a horizontal strut connected with the pier column.
And a protective layer is arranged between the horizontal support connected with the pier stud 11 and the pier stud, and the protective layer is any one of cotton felt, geotextile, rubber pad and felt. The protective layer is used for preventing to lead to the fact destruction to the pier stud after the horizontal brace atress that links to each other with the pier stud.
The center distance of the steel pipe column 1 to the edge of the bearing platform 12 is more than or equal to 0.5 m. Here, the center of the steel pipe column 1 of this embodiment is set to be 0.5m from the edge of the cap 12 in view of safety.
The periphery of pier stud 11 is equipped with the steel pipe support 13 of rectangle, steel pipe support 13 be used for prevent with the level that pier stud 11 links to each other props the gliding, steel pipe support 13 contains four vertical steel pipes at least, this embodiment steel pipe support 13 is four vertical steel pipes, vertical steel pipe is followed pier stud evenly distributed all around, be equipped with the support bracing piece through the steel pipe interconnect of horizontal and/or slant setting between the vertical steel pipe, this embodiment be equipped with the support bracing piece through the steel pipe interconnect of horizontal setting between the vertical steel pipe, every the support bracing piece be used for lifting with the level that pier stud 11 links to each other props, the lower extreme support of steel pipe support 13 is established on cushion cap 12, and is horizontal the support bracing piece erects below the level that pier stud 11 links to each other props.
A construction method of a single-column capping beam steel pipe column Bailey beam construction supporting system is characterized in that research examples are Bishui river bridge projects, the lower part structure form of the Bishui river bridge projects is that a single column is connected with a capping beam form pier, a pier column adopts a square column of 2.5mx2.5m, and the height of the pier column is 10 m; the size of the bent cap is 11 mx2.8mx2.5m; the foundation is 2 phi 2m cast-in-place piles with pile spacing of 5m and bearing platform cross-section size of 8.2mx3.2mx3 m.
Firstly, piling at a design position, arranging a pile foundation 14 on a bearing platform, arranging a pier stud 11 on the bearing platform 12, arranging a pre-embedded connecting piece at the joint of the bearing platform 12 and the steel pipe column 1, pre-embedding the pre-embedded connecting piece before pouring concrete on the bearing platform 12, and accurately embedding the pre-embedded position;
step two, determining and installing the position of the steel pipe column 1, wherein the steel pipe column 1 is composed of standard sections with different lengths, the length of the steel pipe column 1 can be adjusted, the selected standard sections are spliced by flange plates on the ground and fixed by bolts to form the steel pipe column 1 with the length meeting the design requirement, four steel pipe columns 1 are arranged on two sides of the pier column 11 in parallel, the four steel pipe columns 1 are sequentially hoisted in place by a crane, the center of each steel pipe column 1 is at a certain distance from the edge of the bearing platform 12, the position of each steel pipe column 1 is determined by combining the node of a Bailey beam 6, the steel pipe columns 1 are fixed on the bearing platform 12 by adopting pre-embedded connecting pieces, the steel pipe columns 1 are connected by flanges, the center of each steel pipe column 1 is not less than 0.5m from the edge of the bearing platform 12, and the pre-embedded connecting pieces in the embodiment adopt flange plates with foundation bolts, the distance between the center of the steel pipe column 1 and the edge of the bearing platform 12 is 0.5 m;
step three, manufacturing and installing an inclined strut 2, welding the inclined strut 2 and the steel pipe column 1 to form a whole, oppositely pulling the inclined strut 2 and the pier column 11 to form a whole through an inclined strut hoop opposite pull rod 3, welding the inclined strut 2 and the steel pipe column 1 in two directions of vertical and horizontal directions by adopting 20-number channel steel, oppositely pulling the inclined strut hoop opposite pull rod 3 on two sides of the pier column 11 body, fixing the inclined strut 2 and the pier column 11, arranging a plurality of inclined struts 2, and arranging the inclined struts to be any one of Z-shaped and X-shaped, wherein the inclined strut 2 selected in the embodiment is arranged in a Z-shaped manner, the inclined strut 2 comprises a horizontal strut and a steel pipe column inclined strut, the horizontal strut comprises a horizontal strut directly welded with the steel pipe column 1 and a horizontal strut connected with the pier column 11, a protective layer is arranged between the horizontal strut connected with the pier column 11 and the pier column 11, and the protective layer is made of a flexible material, the used flexible material is a material with certain softness and flexibility and is suitable for building construction, the protective layer is any one of cotton felt, geotextile, rubber pad and felt, the protective layer is selected to be the cotton felt in the embodiment, the protective layer is used for preventing the pier 11 from being damaged after a horizontal support connected with the pier 11 is stressed, steel pipe supports 13 are arranged on the periphery of the pier 11, the steel pipe supports 13 are used for preventing the horizontal support connected with the pier 11 from sliding downwards, the steel pipe supports 13 at least comprise four vertical steel pipes, the steel pipe supports 13 are four vertical steel pipes in the embodiment, the vertical steel pipes are uniformly distributed along the periphery of the pier, support supporting rods connected with each other through the steel pipes arranged transversely and/or obliquely are arranged between the vertical steel pipes, and the support supporting rods connected with each other through the steel pipes arranged transversely are arranged between the vertical steel pipes in the embodiment, each support supporting rod is used for lifting a horizontal support connected with the pier stud 11, the lower end of the steel pipe support 13 is supported and arranged on the bearing platform 12, and the transverse support supporting rod is erected below the horizontal support connected with the pier stud 11;
step four, installing a movable head 4, wherein the movable head 4 is connected with the steel pipe column 1 through a flange plate, the height of the movable head 4 is 1.4m, the height of the movable head can be adjusted up and down to be 0.2m, the height of the movable head 4 can be adjusted up and down, when the height of the top surface of the movable head 4 is determined, the movable head can be combined with a cross slope of a cover beam 10 to be arranged, and the cover beam 10 is subjected to structural slope finding through the elevation of the top surface of the movable head 4;
step five, installing a distribution beam 5, wherein the distribution beam 5 is arranged above the movable head 4 and is connected with a top steel plate of the movable head 4 through spot welding to prevent the distribution beam 5 from moving, the distribution beam 5 is made of double-spliced I45a I-steel, the length of the distribution beam 5 is determined by combining the plane position of the Bailey beam 6, and the Bailey beam 6 can fall on the distribution beam 5; the problem that the bearing platform cannot be erected just below the Bailey beam due to insufficient size of the bearing platform can be solved by using the length of the distribution beam;
step six, installing the Bailey beams 6, wherein the Bailey beams 6 consist of at least two Bailey sheets, a plurality of Bailey sheets form one Bailey beam, four Bailey beams form one Bailey beam 6, three Bailey beams 6 form one Bailey beam group, the Bailey sheets are spliced into the Bailey beams 6 on the ground, the Bailey beams 6 are sequentially hoisted in place, the Bailey beams 6 are arranged above the distribution beams 5, the Bailey beams 6 and the distribution beams 5 are locked firmly by adopting U-shaped bolts to prevent the Bailey beams 6 from sliding, the Bailey beams 6 are abutted against the pier stud 11 to prevent the Bailey beams 6 from being horizontally unstable inwards, the Bailey beams 6 are arranged outside the pier stud 11 and are oppositely pulled by the Bailey beam horizontal opposite pull rods 7 to prevent the Bailey beams 6 from being horizontally outwards stable, the Bailey sheets are connected by pins, and the Bailey beams are connected by flower stands;
seventhly, installing a main beam 8, wherein the main beam 8 is arranged above the Bailey beam 6 and is 125a I-steel, the distance is 0.5m, the main beam 8 stretches across the Bailey beam 6, the length of the main beam 8 is determined by combining the operating platform of the cover beam 10, and the operating platform, a safety protection net and an upper and lower personnel passage are installed immediately after the main beam 8 is installed;
eighthly, arranging a bent cap shaping steel template 9 above the main beam 8, customizing the bent cap shaping steel template by a manufacturer, adopting a 5mm steel template, reinforcing the back rib of the bent cap shaping steel template 9 by adopting channel steel and I-shaped steel, and reinforcing the back rib by oppositely pulling phi 25 finish-rolled deformed steel;
pouring cover beam concrete, stretching prestressed tendons according to design requirements, dismantling the steel pipe column and the Bailey beam after stretching, dismantling by using a jack in a matched mode, slightly jacking each movable head 4 by using two jacks, unloading the pins for fixing the movable heads, pulling out the pins for fixing the movable heads by jacking height, falling back by about 3cm by using the jacks, fixing the movable heads 4, and repeatedly performing repeated operation to realize frame falling.
The steel pipe column 1 is erected in a plane where a vertical section at the node of the Bailey beam 6 is located.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (9)
1. The utility model provides a single-column bent cap steel-pipe column bailey beam construction braced system which characterized in that: the capping beam concrete load supporting device comprises a support foundation, a supporting system for supporting a capping beam concrete load, a capping beam shaping steel formwork positioned above the supporting system, and a capping beam arranged above the capping beam shaping steel formwork;
the support foundation comprises a pile foundation and a bearing platform positioned on the pile foundation;
a pier column is arranged on the bearing platform;
the support system sequentially comprises a steel pipe column, a movable head, a distribution beam, a Bailey beam and a main beam from bottom to top, wherein the movable head is connected with the steel pipe column through a flange plate, the distribution beam is connected with the top surface of the movable head, the Bailey beam is arranged above the distribution beam, is abutted against the pier column and is used for preventing the Bailey beam from being horizontally unstable inwards, is arranged on the outer side of the pier column and is oppositely pulled through the Bailey beam to a pull rod horizontally and is used for preventing the Bailey beam from being horizontally unstable outwards, the main beam is arranged above the Bailey beam, and the main beam stretches across the Bailey beam;
the bent cap design steel form set up in girder top, the steel-pipe column adopts the ring flange to pass through pre-buried connecting piece vertical fixing on the cushion cap, the bracing with the steel-pipe column is connected, through the bracing staple bolt draw bar with the pier stud is to drawing the formation wholly, will the bracing with the pier stud is fixed.
2. The single-column bent cap steel pipe column Bailey beam construction supporting system according to claim 1 is characterized in that: the steel pipe column comprises standard sections with different lengths, the steel pipe columns are connected through flanges, the inclined struts are welded with the steel pipe columns in the longitudinal direction and the transverse direction, the inclined strut hoops are used for oppositely pulling the pull rods on two sides of the pier column, and the inclined struts are erected in a Z shape or an X shape.
3. The single-column bent cap steel pipe column Bailey beam construction supporting system according to claim 2 is characterized in that: the Bailey beam and the distribution beam are locked firmly by adopting U-shaped bolts and are used for preventing the Bailey beam from sliding.
4. The single-column bent cap steel pipe column Bailey beam construction supporting system according to claim 3, is characterized in that: the steel pipe column is erected in a plane where a vertical section at the position of a Bailey beam node is located, the Bailey beam is composed of at least two Bailey pieces, a plurality of Bailey pieces form a Bailey beam, the Bailey pieces are connected through pins, and each Bailey beam is connected through a flower stand.
5. The single-column bent cap steel pipe column Bailey beam construction supporting system according to claim 4, is characterized in that: the inclined strut comprises a horizontal strut and a steel pipe column inclined strut, and the horizontal strut comprises a horizontal strut directly welded with the steel pipe column and a horizontal strut connected with the pier column.
6. The single-column bent cap steel pipe column Bailey beam construction supporting system according to claim 5, is characterized in that: and a protective layer is arranged between the horizontal support connected with the pier stud and is any one of cotton felt, geotextile, rubber pad and felt.
7. The single-column bent cap steel pipe column Bailey beam construction supporting system according to claim 6, is characterized in that: the center distance of the steel pipe column is greater than or equal to 0.5m at the edge of the bearing platform, a steel pipe support is arranged on the periphery of the pier column, the steel pipe support is used for preventing the horizontal support connected with the pier column from sliding downwards, the steel pipe support at least comprises four vertical steel pipes, the vertical steel pipes are uniformly distributed on the periphery of the pier column, support supporting rods which are connected with each other through steel pipes arranged transversely and/or obliquely are arranged between the vertical steel pipes and used for fixing and lifting the horizontal support connected with the pier column, the lower end of the steel pipe support is supported and arranged on the bearing platform, and the support supporting rods are erected below the horizontal support connected with the pier column.
8. A construction method of a single-column bent cap steel pipe column Bailey beam construction supporting system is characterized by comprising the following steps:
firstly, piling at a design position, arranging a pile foundation on a bearing platform, arranging a pier column on the bearing platform, arranging a pre-embedded connecting piece at the joint of the bearing platform and the steel pipe column, pre-embedding the pre-embedded connecting piece before pouring concrete on the bearing platform, and accurately embedding the pre-embedded position;
determining and installing the position of a steel pipe column, wherein the steel pipe column is composed of standard sections with different lengths, the length of the steel pipe column can be adjusted, the steel pipe columns are connected through flanges, the center of the steel pipe column is a certain distance away from the edge of the bearing platform, the position of the steel pipe column is determined by combining the nodes of the Bailey beam, the steel pipe column is fixed on the bearing platform through a pre-embedded connecting piece, and the distance between the center of the steel pipe column and the edge of the bearing platform is not less than 0.5 m;
step three, manufacturing and installing an inclined strut, welding the inclined strut and the steel pipe column to form a whole, oppositely pulling the inclined strut and the pier column to form a whole through an inclined strut hoop opposite pull rod, welding the inclined strut and the steel pipe column in two directions of vertical and horizontal, oppositely pulling the inclined strut hoop opposite pull rod on two sides of a pier column body, fixing the inclined strut and the pier column, arranging a plurality of inclined struts in any one of Z-shaped and X-shaped erection, arranging a horizontal strut and the inclined strut, wherein the inclined strut comprises a horizontal strut directly welded with the steel pipe column and a horizontal strut connected with the pier column, arranging a protective layer between the horizontal strut connected with the pier column and the pier column, the protective layer is any one of cotton felt, geotextile, rubber mat and felt, and is used for preventing the pier column from being damaged after the horizontal strut connected with the pier column is stressed, the steel pipe support is arranged on the periphery of the pier stud and used for preventing the horizontal support connected with the pier stud from sliding downwards, the steel pipe support at least comprises four vertical steel pipes, the vertical steel pipes are uniformly distributed along the periphery of the pier stud, support rods which are connected with each other through the steel pipes arranged transversely and/or obliquely are arranged between the vertical steel pipes, each support rod is used for fixing and lifting the horizontal support connected with the pier stud, the lower end of the steel pipe support is supported and arranged on the bearing platform, and the transverse support rod is erected below the horizontal support connected with the pier stud;
step four, mounting a movable joint, wherein the movable joint is connected with the steel pipe column through a flange plate, the height of the movable joint is adjustable up and down, when the height of the top surface of the movable joint is determined, the movable joint can be combined with a cross slope of a capping beam, and structural slope finding is carried out on the capping beam through the elevation of the top surface of the movable joint;
step five, installing a distribution beam, wherein the distribution beam is arranged above the movable head and is connected with a top steel plate of the movable head through spot welding to prevent the distribution beam from moving, and the length of the distribution beam is determined by combining with the plane position of the Bailey beam to ensure that the Bailey beam can fall on the distribution beam;
step six, installing the Bailey beams, wherein the Bailey beams consist of at least two Bailey sheets, a plurality of Bailey sheets form a Bailey beam, the Bailey sheets are spliced into the Bailey beams on the ground, the Bailey beams are sequentially hoisted in place and are arranged above the distribution beams, the Bailey beams and the distribution beams are firmly locked by adopting U-shaped bolts to prevent the Bailey beams from sliding, the Bailey beams are abutted against the pier stud to prevent the Bailey beams from being horizontally unstable inwards, the Bailey beams are arranged outside the pier stud and are horizontally pulled to pull rods through the Bailey beams to prevent the Bailey beams from being horizontally unstable outwards, the Bailey sheets are connected by pins, and each Bailey beam is connected by a flower stand;
step seven, installing a main beam, wherein the main beam is arranged above the Bailey beam and spans the Bailey beam, the length of the main beam is determined by combining the cover beam operation platform, and the operation platform, the safety protection net and the personnel upper and lower channels are installed immediately after the main beam is installed;
placing a bent cap shaping steel template above the main beam, customizing the bent cap shaping steel template by a manufacturer, reinforcing a shaping steel template back rib by adopting channel steel and I-shaped steel, and reinforcing the steel by oppositely drawing and finish rolling deformed steel;
and step nine, pouring the cover beam concrete, tensioning the prestressed tendons according to design requirements, and removing the steel pipe columns and the Bailey beams after tensioning.
9. The construction method of the single-column bent cap steel pipe column Bailey beam construction supporting system according to claim 8, is characterized in that: the steel pipe column is erected in a plane where a vertical section at the Bailey beam node is located.
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| CN113089491A (en) * | 2021-04-09 | 2021-07-09 | 中铁九局集团第七工程有限公司 | Construction method of large cantilever prestressed concrete bent cap |
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| CN116988396A (en) * | 2023-09-15 | 2023-11-03 | 中铁十六局集团第三工程有限公司 | Novel big bent cap construction bearing structure |
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