CN111042006A - High pier edge span suspension casting beam Bailey truss structure and construction method thereof - Google Patents
High pier edge span suspension casting beam Bailey truss structure and construction method thereof Download PDFInfo
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- CN111042006A CN111042006A CN202010049104.7A CN202010049104A CN111042006A CN 111042006 A CN111042006 A CN 111042006A CN 202010049104 A CN202010049104 A CN 202010049104A CN 111042006 A CN111042006 A CN 111042006A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
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Abstract
The invention provides a Bailey truss structure of a high pier side span suspension casting beam and a construction method thereof, relating to the technical field of side span construction of suspension casting beams and comprising Bailey truss modules, positioning assemblies and anchoring assemblies, crossbeam and longeron, locating component is installed to the bottom of bailey frame module, bailey frame module is used for setting up on the bent cap of high mound, locating component is used for the card to locate the both sides limit of bent cap, bailey frame module divide into front end cantilever and rear end cantilever in the both sides of bent cap, bailey frame module is used for being connected with the bent cap, anchor component sets up the end that is used for the anchor in the cushion cap of high mound in the rear end cantilever, the crossbeam interval sets up between the front end cantilever bottom of bailey frame module, the longeron interval sets up in the crossbeam up end, it is many to solve the support member that the cast-in-place section was adopted to the cantilever beam side span among the prior art, set up the land used great and cycle length, the inconvenient problem of installation and. The invention has simple structure and whole construction process, easy operation, quick assembly and disassembly, high work efficiency and high material recycling rate.
Description
Technical Field
The invention belongs to the technical field of side span construction of a cantilever beam, and particularly provides a high pier side span cantilever beam Bailey truss structure and a construction method thereof.
Background
At present, the formula full hall frame and straight oblique stand steel pipe support bracket system are buckled to formula of bowl often to cast-in-place section of cantilever beam side span, wherein the formula of bowl knot formula full hall frame's bowl mouth node is intensive, need more fastener, straight oblique stand steel pipe support bracket system equally needs more fastener, the material quantity is big, the period of setting up of support is longer, require high to the ground, the settlement volume of production is big, be unsuitable for the operating mode that has the river beside the construction bridge, and to having main bridge floor road surface below the construction bridge, be not convenient for block under the condition of traffic, can't directly set up above-mentioned two kinds of supports on bridge floor road surface.
Accordingly, there is a need in the art for a high pier edge span cantilever beam beret truss structure and a construction method thereof to solve the above problems.
Disclosure of Invention
The invention provides a Bailey truss structure of a high pier side span cantilever beam and a construction method thereof, and solves the problems that in the prior art, a cantilever beam side span cast-in-place section adopts more support rods, has larger erection area and long period, and is inconvenient to install and disassemble.
The technical scheme of the invention is realized as follows: on one hand, the invention provides a Bailey truss structure of a high pier edge span suspension casting beam, which comprises Bailey truss modules formed by assembling Bailey sheets, a positioning assembly, an anchoring assembly, cross beams and longitudinal beams, wherein the positioning assembly is installed at the bottom of the Bailey truss modules, the Bailey truss modules are used for being erected on a cover beam of a high pier along the bridge direction, the positioning assembly is used for being clamped on two side edges, perpendicular to the bridge direction, of the cover beam, the Bailey truss modules are divided into front-end cantilevers and rear-end cantilevers on two sides of the cover beam, the portions, close to the rear-end cantilevers, of the Bailey truss modules are used for being connected with the cover beam, the anchoring assembly is arranged at the tail ends of the rear-end cantilevers and used for being anchored on a bearing platform of the high pier, the cross beams are arranged between the bottoms of the front-end cantilevers of the Bailey truss modules at intervals, and the longitudinal beams are arranged.
The technical effect of the scheme is as follows: the assembling process between the bailey pieces is simple and easy to operate, the consumed time is short, the formed bailey frame module is directly hung on the cover beam and is positioned through the positioning assembly, the bailey frame module can be quickly installed at a proper position on the cover beam, the bailey frame module is quickly and accurately positioned, the bailey frame module is convenient and quick to install, and the bailey frame module can be directly and repeatedly used in the construction of the same type of parts after being integrally disassembled, so that the construction efficiency is improved; because the part of the bailey truss module close to the rear end cantilever is connected with the bent cap, when the cantilever beam is poured, the front end cantilever of the bailey truss module can cause tension on the pier stud, and the rear end cantilever of the bailey truss module is anchored on the bearing platform, so that the influence of the tension on the pier stud caused by a cantilever section can be counteracted, the construction safety coefficient is greatly improved, and the double-insurance effect is achieved; the whole Bailey truss structure is simple in structure, quick in construction, large in bearing capacity, high in safety factor and good in economic benefit, does not influence traffic of roads under a construction bridge section, and is favorable for popularization and application.
In the preferred technical scheme of the Bailey truss structure with the high pier edge span suspension-cast beam, the Bailey truss module comprises a plurality of Bailey piece groups which are arranged in parallel, each Bailey piece group is formed by connecting a plurality of Bailey pieces along the bridge direction, and each Bailey piece group is connected by adopting a standard window pattern support frame.
The technical effect of the scheme is as follows: the standard window decoration support frames are adopted for connection, the connection is firm and reliable, the bridge pier is assembled on the ground beside the bridge pier and integrally hoisted to the bent cap, the high-altitude operation amount is reduced, the construction safety is ensured, and the working efficiency is improved.
In the preferred technical scheme of the Bailey truss structure with the high pier edge span suspension casting beam, the positioning assembly comprises two parallel angle steels, the angle steels are perpendicular to the Bailey pieces, the angle steels are connected with at least one Bailey piece, and the two angle steels are clamped on two sides of the cover beam perpendicular to the bridge direction.
The technical effect of the scheme is as follows: when the bailey truss module is erected at the measuring and positioning position on the bent cap, the angle steel is just clamped at the two sides of the bent cap, so that the bailey truss module is quickly positioned; the angle steel is as steel member commonly used in the building engineering, and convenient production and use also are convenient for simultaneously with bailey frame module installation.
In the preferred technical scheme of the Bailey truss structure with the high pier edge span cantilever beam, the angle steel is connected with the Bailey sheet group along a broken line of the angle steel, an opening of the angle steel is arranged back to the bent cap, and an included angle between the side surface of the angle steel close to the bent cap and a plane where the bottom of the Bailey sheet group is located is 60 degrees.
The technical effect of the scheme is as follows: because the bailey truss module is hanging and is established and put the in-process on the bent cap and probably be rocked by the influence production of wind-force etc. can not be accurate hang the angle steel of bailey truss module bottom to the both sides upper portion that just in time lies in the bent cap, leave through above-mentioned setting and rock the surplus, when the side that the angle steel is close to the bent cap contacts with the bent cap, can continue to descend the bailey truss module towards the bent cap, the bailey truss module can just in time fall on the measuring position department on the bent cap under the guide effect of the side of angle steel.
In the preferred technical scheme of the Bailey truss structure of the high-pier edge span suspension-cast beam, the cross beam is hung at the bottom of the Bailey truss module through finish-rolled deformed steel bars, a through sand cylinder is arranged at the bottom of the cross beam, and the finish-rolled deformed steel bars penetrate through the through sand cylinder and are sequentially connected with the base plate and the finish-rolled nuts.
The technical effect of the scheme is as follows: set up a sand section of thick bamboo of punching, when the high mound limit is dismantled and the beam bailey truss structure is watered in suspension to the side, emit the sand in the sand section of thick bamboo, the crossbeam whereabouts of bailey truss module bottom, the longeron falls along with the crossbeam, and then reserves the space of demolising the template, convenient quick dismantlement template.
In the preferred technical scheme of the high pier edge span cantilever beam Bailey truss structure, the length of the front-end cantilever along the bridge direction is equal to the length of the rear-end cantilever along the bridge direction.
The technical effect of the scheme is as follows: when the Bailey frame module is hung on the bent cap, the Bailey frame module is in a self-balancing state, and the Bailey frame module is not easy to overturn in the subsequent connection and anchoring processes.
On the other hand, the invention provides a construction method of a high pier edge span suspension casting beam Bailey truss structure, which comprises the following steps: designing and assembling a bailey truss module: assembling the Bailey sheets along the length direction of the Bailey sheets in a pin-through connection mode to form Bailey sheet groups, and connecting the Bailey sheet groups by using a standard window pattern support frame to form two Bailey frame modules; measurement and positioning: using a total station to release positioning points for erecting two bailey truss modules on the bent cap and mark the positioning points, and installing a positioning assembly at the bottom of the bailey truss module according to the width of the bent cap along the bridge direction; installing and anchoring the bailey truss module: hoisting the bailey truss module to a positioning point on the bent cap, clamping the positioning assembly on two sides of the bent cap, connecting the bent cap and the bailey truss module, and anchoring the tail end of a rear-end cantilever of the bailey truss module to a bearing platform of a high pier; installing a bottom die platform: mounting a cross beam at the bottoms of front-end cantilevers of the two bailey truss modules, welding longitudinal beams on the cross beam at intervals, and paving a steel template on the longitudinal beams; acceptance and prepressing: after acceptance, prepressing is carried out, and the actual elevation of the high pier edge span cantilever beam Bailey truss structure is adjusted; construction of a cast-in-place section: erecting an outer side template, binding steel bars, installing a prestressed pipeline, pouring concrete and maintaining; and (5) dismantling the high pier edge span cantilever beam Bailey truss structure.
The technical effect of the scheme is as follows: the high pier edge span cantilever beam Bailey truss structure has few rods, the whole construction process is simple and easy to operate, the installation and the disassembly are rapid, and the construction efficiency is improved; and after the disassembly, the material recovery rate is high, the Bailey truss module can be directly used for the construction of the similar parts as the whole disassembly, and the construction period is shortened.
In the preferable technical scheme of the construction method of the Bailey truss structure of the high-pier edge-span cantilever beam, the finish-rolled deformed steel bar is embedded in the position, close to the rear-end cantilever of the Bailey truss module, of the cover beam, an embedded part is embedded in the bearing platform of the high pier, and the step of installing and anchoring the Bailey truss module specifically comprises the following steps of: hoisting the bailey truss module to a positioning point on the bent cap to enable the positioning assembly to be clamped on two sides of the bent cap; extending the pre-buried finish-rolled deformed steel bar on the bent cap by using a connector, enabling the pre-buried finish-rolled deformed steel bar to penetrate through a gap between adjacent bailey piece groups to reach the top of the bailey truss module, placing a first double-spliced and pressed beam on the top of the bailey truss module, and connecting the first double-spliced and pressed beam with the pre-buried finish-rolled deformed steel bar; placing a second double-spliced compression beam on the upper end face of a rear-end cantilever of the bailey truss module, arranging a steel strand penetrating through the second double-spliced compression beam along the vertical direction, arranging an anchorage device for fixing the steel strand on the upper end face of the second double-spliced compression beam, and anchoring the lower end of the steel strand to an embedded part of a bearing platform.
The technical effect of the scheme is as follows: the bailey truss module is fixed on the bent cap through the finish rolling deformed steel bar and the double-spliced pressure beam, the fixed connection process is simple and easy to operate, and the stability and firmness of connection of the bailey truss module and the bent cap are guaranteed.
In the preferable technical scheme of the construction method of the high pier edge span suspension casting beam Bailey truss structure, the step of installing the bottom die platform specifically comprises the following steps: hoisting the cross beam at the bottoms of the front-end cantilevers of the two bailey truss modules by adopting finish-rolled deformed steel bars at intervals of a first preset distance; the through sand cylinder is arranged on the finish rolling deformed steel bar at the lower side of the cross beam in a penetrating way and is fixed by a base plate and a finish rolling nut; welding longitudinal beams on the upper end face of the cross beam at intervals of a second preset distance; and laying a steel template on the upper end surface of the longitudinal beam to form a bottom die platform.
The technical effect of the scheme is as follows: the arrangement mode of the cross beam and the longitudinal beam ensures the stability and the strength of the bottom die platform; the sand section of thick bamboo set up the dismantlement of convenient later stage to the template.
In the preferable technical scheme of the construction method of the high pier edge span cantilever beam Bailey truss structure, the step of dismantling the high pier edge span cantilever beam Bailey truss structure specifically comprises the following steps: discharging the sand in the core-through sand cylinder; removing the bottom die platform, and removing the finish-rolled deformed steel bars connected with the bailey truss module and the capping beam and the steel stranded wires anchored with the bailey truss module and the bearing platform; and hoisting the bailey truss module to the ground.
The technical effect of the scheme is as follows: the disassembly process of the Bailey truss structure of the high pier edge span suspension casting beam is simple and convenient, and the Bailey truss module is disassembled as a whole, so that the Bailey truss structure can be applied to the construction of the same type of parts, and has good benefits in energy conservation and environmental protection.
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, and 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 these drawings without creative efforts.
FIG. 1 is a side view of a Bailey truss structure of a high pier edge span cantilever beam of the invention;
FIG. 2 is a front view of a Bailey truss structure of a high pier edge span cantilever beam of the invention;
FIG. 3 is a front view of a Bailey truss module of the Bailey truss structure of the high pier edge span cantilever beam;
FIG. 4 is a side view of a Bailey truss module of the Bailey truss structure of the high pier edge span cantilever beam of the invention;
FIG. 5 is a step diagram of the construction method of the high pier edge span cantilever beam Bailey truss structure.
List of reference numerals: 1. a bailey frame module; 11. a front end cantilever; 12. a rear end cantilever; 13. bailey tablets; 14. a standard window decoration support frame; 2. a positioning assembly; 3. an anchor assembly; 4. a cross beam; 5. a stringer; 51. a steel form; 6. a capping beam; 7. a bearing platform; 8. finish rolling the deformed steel bar; 9. a feed-through sand cylinder; 10. a first double-spliced pressure beam; 101. a second double-split compression beam.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention relates to a concrete embodiment of a high pier edge span suspension casting beam Bailey truss structure, which comprises the following steps: as shown in fig. 1 to 2, a bridge has a cast-in-place section pier height of 22.3m to 29.2m, a side span cantilever casting section length of 4.84m, a capping beam 6 of the bridge has a length of 3m in the bridge direction, the high-pier side span cantilever casting beret truss structure comprises two beret frame modules 1 formed by assembling 321-type beret sheets, a positioning assembly 2, an anchoring assembly 3, a cross beam 4 and a longitudinal beam 5, the bottom of each beret frame module 1 is provided with the positioning assembly 2, the beret frame module 1 is used for being erected on the capping beam 6 of the high pier in the bridge direction, the positioning assembly 2 is clamped on two sides of the capping beam 6 perpendicular to the bridge direction, the beret frame module 1 is divided into a front end cantilever 11 and a rear end cantilever 12 on two sides of the capping beam 6, the front end cantilever 11 is used for supporting a formwork, a part of the beret frame module 1 close to the rear end cantilever 12 is used for being connected with the capping beam 6, the anchoring assembly 3 is arranged at the tail end of the rear end cantilever 12 and is used for being anchored, the plurality of cross beams 4 are arranged between the bottoms of front-end cantilevers 11 of the bailey truss modules 1 at intervals, and the plurality of longitudinal beams 5 are arranged on the upper end faces of the cross beams 4 at intervals.
The assembling process between the bailey pieces is simple and easy to operate, the consumed time is short, the formed bailey truss module 1 is directly hung on the cover beam 6 and is positioned by the positioning assembly 2, the bailey truss module 1 can be quickly installed at a proper position on the cover beam 6, the bailey truss module 1 is quickly and accurately positioned, the installation is convenient and quick, and the bailey truss module 1 can be directly and repeatedly used in the construction of the same type of parts after being integrally disassembled, so that the construction efficiency is improved; because the part of the bailey truss module 1 close to the rear end cantilever 12 is connected with the bent cap 6, when the cantilever beam is poured, the front end cantilever 11 of the bailey truss module 1 can cause tension on the pier stud, and the rear end cantilever 12 of the bailey truss module 1 is anchored on the bearing platform 7, so that the influence of the tension on the pier stud caused by a cantilever section can be counteracted, the construction safety coefficient is greatly improved, and the double-insurance effect is achieved; the whole Bailey truss structure is simple in structure, quick in construction, large in bearing capacity, high in safety factor and good in economic benefit, does not influence traffic of roads under a construction bridge section, and is favorable for popularization and application.
As shown in fig. 3 and 4, according to the condition that the length of the side span cantilever casting section is 4.84m and the length of the capping beam 6 is 3m, preferably, the bailey truss module 1 comprises four bailey piece groups arranged in parallel, each bailey piece group is formed by connecting three 321-type bailey pieces 13 in the bridge direction, the bailey piece groups are connected by adopting a standard window decoration support frame 14, the standard window decoration support frame 14 is 450-type, namely the width of the standard window decoration support frame 14 is 0.45m, the distance between the bailey piece groups is 0.45m, the standard window decoration support frames 14 are adopted for connection, the connection is firm and reliable, the bailey truss is assembled on the ground beside a pier and integrally hoisted to the capping beam 6, the high-altitude work amount is reduced, the construction safety is ensured, and the work efficiency is improved.
Referring to fig. 1 again, preferably, the length of the front-end cantilever 11 of the bailey truss module 1 along the bridge direction is equal to the length of the rear-end cantilever 12 along the bridge direction, and since the length of the 321-type bailey piece 13 is exactly 3m, the total length of the bailey truss module 1 is 9m, and the length of the bent cap 6 is 3m, when the bailey truss module 1 is hung on the bent cap 6, the front-end cantilever 113m is equal to the rear-end cantilever 123m, a self-balancing state is just formed, and it is ensured that the bailey truss module 1 does not overturn in the subsequent connecting and anchoring processes.
It is to be understood that, although the number of beret groups included in the beret frame module 1 and the number of beret sheets 13 included in the beret frame module are given in the above embodiments, this is not a limitation to the number, and those skilled in the art may specifically analyze and design the number of beret groups included in the beret frame module 1 and the number of beret sheets 13 included in the beret frame module according to the length of the side span cantilever segment and the length of the cap beam 6.
Referring to fig. 2 again, preferably, the positioning assembly 2 includes two parallel angle steels perpendicular to each beret group, the angle steels are connected to the four beret groups, and in a case that the beret frame module 1 is erected on the cover beam 6, the two angle steels are clamped on two sides of the cover beam 6 perpendicular to the bridge direction. When the bailey truss module 1 is erected at the measuring and positioning position on the bent cap 6, the angle steel is just clamped at two sides of the bent cap 6, so that the bailey truss module 1 is quickly positioned; the angle steel is as steel member commonly used in the building engineering, convenient production and use, also is convenient for simultaneously with installation of bailey frame module 1.
Preferably, the angle steel is connected with the bailey piece group along the broken line of the angle steel, the opening of the angle steel is arranged back to the bent cap 6, and the included angle between the side surface of the angle steel close to the bent cap 6 and the plane where the bottom of the bailey piece group is located is 60 degrees. Because the bailey truss module 1 may rock under the influence of wind power and the like in the process of hanging and placing on the bent cap 6, the angle steel of the bottom of the bailey truss module 1 cannot be accurately hung to the upper parts of the two sides of the bent cap 6, the shaking allowance is reserved through the setting, when the side face of the angle steel close to the bent cap 6 contacts with the bent cap 6, the bailey truss module 1 can continue to descend towards the bent cap 6, and the bailey truss module 1 can just fall on the bent cap 6 under the guiding action of the side face of the angle steel.
Preferably, the cross beam 4 is 36b I-steel, the longitudinal beam 5 is 18# I-steel, the cross beam 4 is fixedly hung at the bottom of the Bailey truss module 1 through 15mm finish-rolled deformed steel bars 8, a through-center sand cylinder 9 is arranged at the bottom of the cross beam 4, and the finish-rolled deformed steel bars 8 penetrate through the through-center sand cylinder 9 and are sequentially connected with the base plate and the finish-rolled nuts. Set up a sand section of thick bamboo 9 of punching, when the high mound limit is dismantled and the roof beam bailey truss structure is watered in suspension, emit the sand in the sand section of thick bamboo, the 4 whereabouts of crossbeam 4 of bailey frame module 1 bottom, longeron 5 falls along with crossbeam 4, and then reserves the space of demolising the template, convenient quick dismantlement template.
As shown in fig. 5, the construction method of the high pier edge span cantilever beam bailey truss structure includes the following steps:
s1, designing and assembling the bailey truss module: three 321-type bailey pieces 13 are assembled along the length direction of the bailey pieces in a pin-through connection mode to form a bailey piece group, and a standard window pattern support frame 14 is adopted to connect the bailey piece groups to form two bailey frame modules 1;
s2, measurement and positioning: a total station is used for releasing the central point positions for erecting two bailey truss modules 1 at two ends of the upper end surface of the bent cap 6 and popping up a central point cross line (namely a positioning point), and as the width of the bent cap 6 along the bridge direction is equal to 3m and equal to the length of the 321-type bailey sheet, positioning assemblies 2 are installed at the bottoms of two ends of the 321-type bailey sheet positioned in the middle of the bailey truss modules 1;
s3, mounting and anchoring the bailey truss module: hoisting the bailey truss module 1 to a positioning point on the bent cap 6, clamping the positioning assembly 2 on two sides of the bent cap 6, connecting the bent cap 6 with the bailey truss module 1, and anchoring the tail end of a rear-end cantilever 12 of the bailey truss module 1 to a bearing platform 7 of a high pier;
s4, mounting a bottom die platform: mounting a cross beam 4 at the bottom of front-end cantilevers 11 of two bailey truss modules 1, welding longitudinal beams 5 on the cross beam 4 at intervals, and paving a steel template 51 on the longitudinal beams 5;
s5, acceptance and prepressing: after acceptance, prepressing is carried out, and the actual elevation of the high pier edge span cantilever beam Bailey truss structure is adjusted;
s6, construction of a cast-in-place section: erecting an outer side template, binding steel bars, installing a prestressed pipeline, pouring concrete and maintaining;
s7, dismantling the high pier edge span cantilever beam Bailey truss structure.
Preferably, 32mm finish-rolled deformed steel bar 8 is embedded in the position, close to the rear-end cantilever 12 of the bailey truss module 1, of the bent cap 6, an embedded part is embedded in the bearing platform 7 of the high pier, and the step S3 of installing and anchoring the bailey truss module 1 specifically comprises the following steps:
hoisting the bailey truss module 1 to a positioning point on the bent cap 6, and enabling the positioning assembly 2 to be clamped on two sides of the bent cap 6;
extending the pre-buried finish-rolled deformed steel bar 8 on the bent cap 6 by using a connector, enabling the pre-buried finish-rolled deformed steel bar to penetrate through a gap between adjacent bailey piece groups to reach the top of the bailey truss module 1, placing a first double-spliced and pressed beam 10 on the top of the bailey truss module 1, and connecting the first double-spliced and pressed beam with the pre-buried finish-rolled deformed steel bar 8;
placing a second double-spliced pressure beam 101 on the upper end face of a rear-end cantilever 12 of the bailey truss module 1, arranging a steel strand penetrating through the second double-spliced pressure beam 101 along the vertical direction, arranging an anchorage device for fixing the steel strand on the upper end face of the second double-spliced pressure beam 101, and anchoring the lower end of the steel strand to an embedded part of the bearing platform 7.
Preferably, the step S4 "installing the bottom die platform" specifically includes the following steps:
each interval is 30cm, namely a first preset distance, finish-rolled deformed steel bars 8 of 15mm are adopted to hang the cross beam 4 firmly at the bottom of the front end cantilever 11 of the two bailey truss modules 1;
a through sand cylinder 9 is arranged on the finish rolling deformed steel bar 8 at the lower side of the beam 4 in a penetrating way and is fixed by a base plate and a finish rolling nut;
welding longitudinal beams 5 on the upper end face of the cross beam 4 at intervals of 50cm, namely a second preset distance;
and laying a steel template 51 on the upper end surface of the longitudinal beam 5 to form a bottom die platform.
Preferably, the step S7 of dismantling the high pier edge span cantilever beam beret truss structure specifically includes the following steps:
discharging the sand in the core-through sand cylinder 9;
removing the bottom die platform, and removing the finish-rolled deformed steel 8 of the bailey truss module 1 connected with the bent cap 6, and the steel strands anchored by the bailey truss module 1 and the bearing platform 7;
and hoisting the bailey truss module 1 to the ground.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The Bailey truss structure is characterized by comprising Bailey truss modules, a positioning assembly, anchoring assemblies, cross beams and longitudinal beams, wherein the Bailey truss modules are formed by Bailey sheets in an assembling mode, the positioning assembly is installed at the bottom of the Bailey truss modules, the Bailey truss modules are used for being erected on cover beams of high piers in the bridge direction, the positioning assemblies are used for being clamped on two sides of the cover beams, perpendicular to the bridge direction, and are divided into front-end cantilevers and rear-end cantilevers on two sides of the cover beams, the portions, close to the rear-end cantilevers, of the Bailey truss modules are used for being connected with the cover beams, the anchoring assemblies are arranged at the tail ends of the rear-end cantilevers and are used for being anchored on bearing platforms of the high piers, the cross beams are arranged between the bottoms of the front-end cantilevers of the Bailey truss modules at intervals, and the longitudinal beams are arranged on the upper end faces of the cross beams.
2. The Bailey truss structure with the high pier edge span suspension casting beam of claim 1, wherein the Bailey truss module comprises a plurality of Bailey sheet groups which are arranged in parallel, each Bailey sheet group is formed by connecting a plurality of Bailey sheets in the bridge direction, and the Bailey sheet groups are connected by adopting a standard window pattern support frame.
3. The Bailey truss structure with the high pier edge span cantilever beam as claimed in claim 2, wherein the positioning assembly comprises two parallel angle steels, the angle steels are perpendicular to each Bailey sheet group, the angle steels are connected with at least one Bailey sheet group, and the two angle steels are used for being clamped on two sides of the cover beam perpendicular to the bridge direction.
4. The Bailey truss structure with the high pier edge span cantilever beam as claimed in claim 3, wherein the angle steel is connected with the Bailey sheet group along a broken line thereof, an opening of the angle steel is arranged opposite to the cover beam, and an included angle between a side surface of the angle steel close to the cover beam and a plane where the bottom of the Bailey sheet group is located is 60 degrees.
5. The Bailey truss structure of the high pier edge span suspension casting beam according to claim 1, wherein the cross beam is hung at the bottom of the Bailey truss module through finish-rolled deformed steel bars, a through sand cylinder is arranged at the bottom of the cross beam, and the finish-rolled deformed steel bars penetrate through the through sand cylinder and are sequentially connected with a base plate and finish-rolled nuts.
6. The high pier edge span cantilever beam bailey truss structure of claim 1 wherein the length of the front cantilever arms in the bridge direction is equal to the length of the rear cantilever arms in the bridge direction.
7. The construction method of the high pier edge span suspension casting beam Bailey truss structure is characterized by comprising the following steps of:
designing and assembling a bailey truss module: assembling the Bailey sheets along the length direction of the Bailey sheets in a pin-through connection mode to form Bailey sheet groups, and connecting the Bailey sheet groups by using a standard window pattern support frame to form two Bailey frame modules;
measurement and positioning: using a total station to release positioning points for erecting two bailey truss modules on the bent cap and mark the positioning points, and installing a positioning assembly at the bottom of the bailey truss module according to the width of the bent cap along the bridge direction;
installing and anchoring the bailey truss module: hoisting the bailey truss module to a positioning point on the bent cap, clamping the positioning assembly on two sides of the bent cap, connecting the bent cap and the bailey truss module, and anchoring the tail end of a rear-end cantilever of the bailey truss module to a bearing platform of a high pier;
installing a bottom die platform: mounting a cross beam at the bottoms of front-end cantilevers of the two bailey truss modules, welding longitudinal beams on the cross beam at intervals, and paving a steel template on the longitudinal beams;
acceptance and prepressing: after acceptance, prepressing is carried out, and the actual elevation of the high pier edge span cantilever beam Bailey truss structure is adjusted;
construction of a cast-in-place section: erecting an outer side template, binding steel bars, installing a prestressed pipeline, pouring concrete and maintaining;
and (5) dismantling the high pier edge span cantilever beam Bailey truss structure.
8. The construction method of the Bailey truss structure of the high pier edge-span cantilever beam according to claim 7, wherein the position, close to the rear end cantilever of the Bailey truss module, of the bent cap is pre-embedded with finish-rolled deformed steel bars, the embedded part is pre-embedded in the bearing platform of the high pier, and the step of installing and anchoring the Bailey truss module specifically comprises the following steps:
hoisting the bailey truss module to a positioning point on the bent cap to enable the positioning assembly to be clamped on two sides of the bent cap;
extending the pre-buried finish-rolled deformed steel bar on the bent cap by using a connector, enabling the pre-buried finish-rolled deformed steel bar to penetrate through a gap between adjacent bailey piece groups to reach the top of the bailey truss module, placing a first double-spliced and pressed beam on the top of the bailey truss module, and connecting the first double-spliced and pressed beam with the pre-buried finish-rolled deformed steel bar;
placing a second double-spliced compression beam on the upper end face of a rear-end cantilever of the bailey truss module, arranging a steel strand penetrating through the second double-spliced compression beam along the vertical direction, arranging an anchorage device for fixing the steel strand on the upper end face of the second double-spliced compression beam, and anchoring the lower end of the steel strand to an embedded part of a bearing platform.
9. The construction method of the high pier edge span cantilever beam Bailey truss structure according to claim 7, wherein the step of installing the bottom die platform specifically comprises the following steps:
hoisting the cross beam at the bottoms of the front-end cantilevers of the two bailey truss modules by adopting finish-rolled deformed steel bars at intervals of a first preset distance;
the through sand cylinder is arranged on the finish rolling deformed steel bar at the lower side of the cross beam in a penetrating way and is fixed by a base plate and a finish rolling nut;
welding longitudinal beams on the upper end face of the cross beam at intervals of a second preset distance;
and laying a steel template on the upper end surface of the longitudinal beam to form a bottom die platform.
10. The construction method of the high pier edge span cantilever beam Bailey truss structure according to claim 7, wherein the step of dismantling the high pier edge span cantilever beam Bailey truss structure specifically comprises the following steps:
discharging the sand in the core-through sand cylinder;
removing the bottom die platform, and removing the finish-rolled deformed steel bars connected with the bailey truss module and the capping beam and the steel stranded wires anchored with the bailey truss module and the bearing platform;
and hoisting the bailey truss module to the ground.
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