CN112627060A - Side-span cast-in-place section cantilever bearing system and construction method thereof - Google Patents
Side-span cast-in-place section cantilever bearing system and construction method thereof Download PDFInfo
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- CN112627060A CN112627060A CN202011599975.2A CN202011599975A CN112627060A CN 112627060 A CN112627060 A CN 112627060A CN 202011599975 A CN202011599975 A CN 202011599975A CN 112627060 A CN112627060 A CN 112627060A
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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 discloses a side span cast-in-place section cantilever bearing system and a construction method thereof. The arrangement of the Bailey beam assembly is favorable for supporting the pouring template foundation of the side span beam; the front fixing piece and the rear fixing piece are arranged, so that the front end and the rear end are fixed conveniently, and a mounting foundation is indirectly provided for the branch connecting beam; the connector is arranged, so that the connector is convenient to accurately position, conveniently install and monitor the construction stress process; through the setting of the reinforcing chord member at top, inside reinforcement and ejector pin, do benefit to wholeness, construction security and the reliability of guaranteeing bailey beam subassembly.
Description
Technical Field
The invention belongs to the field of building construction, and particularly relates to a cantilever bearing system of a side span cast-in-place section and a construction method thereof.
Background
In the field of constructional engineering bridges, continuous beams are widely applied to river-crossing and road-crossing engineering projects by virtue of excellent crossing capacity and low engineering cost, mid-span beam construction is generally designed as cantilever casting, and side-span beams are generally designed as full-space support cast-in-place construction; and for the side of the side span beam on the bank side of the river bank, which is near water, and the side of the side span beam on the bank side of the river bank, if a support is adopted for cast-in-place, cofferdam drainage needs to be carried out, the foundation is specially treated, the foundation settlement is easy to occur, the cost is high, and the quality and the safety are difficult to guarantee.
Disclosure of Invention
The invention provides a cantilever bearing system of an edge-span cast-in-place section and a construction method thereof, which are used for solving the technical problems of foundation treatment on the side close to water, convenient installation and fixation of a support frame, reasonable stress, installation material saving and the like during edge-span beam pouring.
In order to achieve the purpose, the invention adopts the following technical scheme:
a side span cast-in-place section cantilever bearing system comprises a bearing platform on a pile foundation, a pier stud connected to the bearing platform, a cover beam connected to the pier stud, two groups of Bailey beam assemblies respectively connected to two ends of the cover beam, a rear fixing piece connected between the rear end of each group of Bailey beam assemblies and the cover beam, a bottom beam vertically connected below the front ends of the two groups of Bailey beam assemblies, a front fixing piece connected between the front end of each group of Bailey beam assemblies and the bottom beam, and a sub-connecting beam connected between the cover beam and the bottom beam;
the rear end of the Bailey beam assembly is connected to the cover beam, and the front end of the Bailey beam assembly extends in a cantilever shape to adapt to the length of a span of the side to be poured;
the rear fixing piece comprises a rear fixing rod connected between the top of the Bailey beam assembly and the bearing platform, a connector connected to the lower portion of the rear fixing rod and embedded in advance, and a rear top connecting rod detachably connected between two adjacent rear fixing rods at the top of the Bailey beam assembly.
Furthermore, the sub-connecting beams are arranged at intervals in the horizontal length direction of the cover beam, the top surfaces of the sub-connecting beams are horizontally arranged, and the top surfaces are highly adaptive to the mounting height of the bottom die of the side-span beam cast-in-place section.
Furthermore, the bottom beam is formed by connecting two v-shaped pieces with opposite openings, 21274, and front fixing pieces are connected between the two Contraband-shaped pieces in a penetrating way; the top surface of the bottom beam is adapted to the bottom surface of the sub-connecting beam; the top surface of the bottom beam is provided with a shallow groove clamping connection coupling beam and a Bailey beam assembly.
Furthermore, each section of the Bailey beam assembly comprises cross beams arranged in a square shape, vertical web members connected to the upper cross beam and the lower cross beam in a meter shape in the longitudinal direction, vertical web members connected to the two ends of the left cross beam and the right cross beam in an X shape, and reinforcing members connected to connection nodes of the vertical web members in the meter shape or the X shape; the top of the cross beam is also connected with a reinforcing chord member along the length direction, the reinforcing chord member is a V-shaped member 21274with two opposite openings, and the shaped member Contraband is formed by connecting; each beam end is provided with a bolted lug.
Further, the front fixing piece comprises a front fixing rod connected between two Contraband pieces of the top cross-connecting beam and with the bottom cross-connecting between two Contraband pieces of the bottom beam, and a front top connecting piece connected to the tops of the two beams on the same side; the front fixing piece is connected with the front top connecting piece through a detachable fixing nut and is fixedly connected with the bottom beam through a connecting plate and a fixing nut which are connected below the bottom beam; the tie plate length is no less than the width of the sill beam single Contraband-shaped piece and is symmetrically connected on both Contraband-shaped pieces.
Furthermore, the top of the Bailey beam assembly is also connected with a support bracket, and the support bracket is used for detachably connecting a side mold and a wing plate mold of the side span cast-in-place section.
Furthermore, the top of the connector is mechanically connected with the rear fixing rod, a displacement sensor and a stress sensor are installed at the bottom of the connector, and the displacement sensor and the stress sensor are both connected with a remote computer in a control mode.
Further, the construction method of the side span cast-in-place section cantilever bearing system comprises the following specific steps:
cleaning and leveling the top surface of a cover beam of a side span box beam to be poured, and marking the installation position of a Bailey beam assembly in advance; pre-embedding a connector on a bearing platform at the lower part of a capping beam to be cast, wherein the lower part of the connector is a rod piece and is fixed on the capping beam, and a displacement sensor and a stress sensor are pre-installed on the rod piece at the lower part of the connector;
secondly, two groups of Bailey beam assemblies corresponding to two ends of the bottom die to be installed are manufactured respectively based on the size of the cover beam and the width of the bottom die to be installed, each group of Bailey beam assemblies is composed of two rows of Bailey beam assemblies, and each row of Bailey beam assemblies is assembled on the ground and determined according to the design length of the side span beam; each group of adjacent Bailey beam assemblies are integrally connected through a connecting rod or a connecting plate;
connecting the lower parts of the front ends of the two groups of Bailey beam assemblies with a bottom beam, vertically installing a front top connecting piece on a reinforcing chord member of the Bailey beam assembly, penetrating a front fixing rod through the front top connecting piece, the Bailey beam assembly and a gap in the middle of the bottom beam, and fixedly connecting the two ends of the front fixing rod through a fixing plate and a nut respectively;
fourthly, mounting a rear fixing rod and a lateral temporary support and a protective net on the pre-buried connector, then sequentially hoisting the Bailey beam assembly to the cover beam, and connecting the bottom of the Bailey beam assembly with the top surface of the cover beam through a connecting plate bolt; the top of the rear fixing rod penetrates through the Bailey beam assembly, and then the rear top connecting piece penetrates through the top of the rear fixing piece and is installed on the Bailey beam assembly; after the fastening connection, the temporary support on the rear fixing rod is removed;
fifthly, mounting rear top connecting rods at the tops of two ends of each group of Bailey beam assemblies, mounting rear fixing pieces on the rear top connecting rods, temporarily fixing the tops of the rear fixing rods through fixing plates and nuts, aligning the bottoms of the rear fixing rods to the connectors, and then fixing the nuts at the tops;
sixthly, rechecking the levelness of the Bailey beam assembly and the levelness of the top surface of the bottom beam and the top surface of the cover beam, then connecting the sub-connecting beam between the bottom beam and the cover beam, and rechecking and adjusting the levelness and the elevation of the top surface of the sub-connecting beam after the sub-connecting beam is installed; after the requirements are met, the bamboo plywood is paved on the surface of the bottom die,
step seven, supporting a support bracket on the Bailey beam assembly, installing a side mold and a wing plate mold of the side beam to be cast, and completing the support of the bottom template at the closure section of the cast box beam on the beam body to be cast through the support bracket; and then the beam body construction of the section to be poured is completed.
Further, in the second step, when the Bailey beam assembly is installed, ejector rods are fixedly connected to two sides of the connecting end of the Bailey beam assembly of the adjacent sections in the longitudinal direction, the ejector rods are X-shaped rigid rods, and the ejector rods are arranged in parallel up and down on the Bailey beam assembly to limit the lateral deviation of the Bailey beam assembly.
Further, the integral bearing system is subjected to stress simulation through BIM software in advance, points with larger stress and displacement in the processes of installing a support bracket and pouring and maintaining are determined and optimized, the points with larger stress and displacement are controlled through a reinforcing member and a limiting member, and a sensor and a displacement sensor are installed and controlled in real time in the construction process; in the third step, after the bottom beam is installed and rechecked, at least the bottoms of the two ends of the bottom beam are provided with a stress sensor and a displacement sensor which are connected with a remote computer in a control way; and when the upper load is larger, an inclined strut is arranged between the bottom beam and the pier stud.
The invention has the beneficial effects that:
1) according to the invention, through the arrangement of the Bailey beam assembly, the foundation support of the side mold and the wing panel mold is provided for the pouring of the side span beam, and the foundation support can be provided for the bottom mold of the side span beam through the arrangement of the bottom beam and the sub-connecting beam; the integral bearing system is made of materials and prefabricated in an assembling mode, so that the installation and the materials are saved;
2) according to the invention, through the arrangement of the front fixing piece, the front end of the Bailey beam assembly is fixed, and an installation foundation is indirectly provided for the branch connecting beam; due to the arrangement of the rear fixing piece, tensioning is conveniently provided for the cantilever of the Bailey beam assembly; the connector is convenient to accurately position and conveniently install, and the construction stress process can be monitored through the sensor arranged on the connector;
3) according to the invention, through the arrangement of the reinforcing chord, the internal reinforcing member and the ejector rod on the top of the Bailey beam assembly, the integrity, the good stress performance, the perpendicularity maintenance in the construction process and the like of the Bailey beam assembly are favorably ensured, and the construction safety and the reliability are favorably improved;
in addition, the top of the bottom beam is provided with a shallow groove, so that the installation and the positioning are facilitated, and the bottom of the bottom beam can be also provided with an inclined strut, so that the uniform stress of a system is further ensured, and the bearing capacity is improved; in addition, the system is beneficial to prefabrication and batch construction, and can greatly save materials and construction time; additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention; the primary objects and other advantages of the invention may be realized and attained by the instrumentalities particularly pointed out in the specification.
Drawings
FIG. 1 is a schematic construction view of a cantilever load-bearing system of a side-span cast-in-place section;
FIG. 2 is a front view of the construction of the cantilever bearing system of the side span cast-in-place section;
FIG. 3 is a schematic view of a poured box beam connection;
FIG. 4 is a construction schematic diagram of a cantilever bearing system of a side span box girder to be cast;
FIG. 5 is a construction front view of a cantilever bearing system of a side span box girder to be cast;
FIG. 6 is a schematic view of a connector connection;
FIG. 7 is a schematic view of a Bailey beam assembly and its connection structure;
FIG. 8 is a front view of a Bailey beam assembly and its connection structure;
FIG. 9 is a side view of a Bailey beam assembly and its connection structure;
FIG. 10 is an exploded view of a Bailey beam assembly and its connecting structure during construction;
FIG. 11 is a schematic diagram of a firmware connection;
FIG. 12 is a front firmware connection diagram;
fig. 13 is a schematic view of a segmented beret beam assembly.
Reference numerals: 1-pile foundation, 2-first bearing platform, 3-first pier stud, 4-first capping beam, 5-poured box beam, 6-second bearing platform, 7-second pier stud, 8-second capping beam, 9-rear fixing piece, 91-rear fixing rod, 92-connector, 93-rear top connecting rod, 10-Bailey beam component, 101-cross beam, 102-vertical web member, 103-reinforcing piece, 104-reinforcing chord member, 11-branch connecting beam, 12-bottom beam, 13-front fixing piece, 131-front fixing rod and 132-front top connecting piece.
Detailed Description
Taking a cast-in-place box girder on a certain river as an example, as shown in fig. 1 to 13, a side span cast-in-place section cantilever bearing system comprises a bearing platform on a pile foundation 1, a pier column connected to the bearing platform, a cover beam connected to the pier column, two groups of bailey beam assemblies 9 respectively connected to two ends of the cover beam, a rear fixing member 9 connected between the rear end of each group of bailey beam assemblies 9 and the cover beam, a bottom beam 12 vertically connected below the front ends of the two groups of bailey beam assemblies 9, a front fixing member 13 connected between the front end of each group of bailey beam assemblies 9 and the bottom beam 12, and a sub-connecting beam 11 connected between the cover beam and the bottom beam 12.
In the embodiment, a poured box girder 5 exists in front of a box girder to be crossed, so that the two situations can be divided into two situations, namely the poured box girder 5 and the cast-in-place box girder, a first cover beam 4 connected to the lower part of the poured box girder 5, a first pier 3 connected to the lower part of the first cover beam 4, a first bearing platform 2 connected to the lower part of the first pier 3 and a pile foundation 1 connected to the lower part of the first bearing platform 2; and the lower parts of the box girders are not poured, the second capping beams 8 are connected with the lower parts of the second capping beams 8, the second pier columns 7 are connected with the lower parts of the second pier columns 8, and the second bearing platform 6 is connected with the lower parts of the first pier columns 3 and the pile foundation 1 below the second bearing platform 6.
In this embodiment, the back end of the bailey beam assembly 9 is connected to the second bent cap 8, and the front end is extended to a cantilever shape to adapt to the length of the span of the side to be poured. The rear fixing member 9 includes a rear fixing rod 91 connected between the top of the bailey beam assembly 9 and the second bearing platform 6, a pre-buried connector 92 connected to the lower portion of the rear fixing rod 91, and a rear top connecting rod 93 detachably connected between two adjacent rear fixing rods 91 at the top of the bailey beam assembly 9. The rear top connecting rod 93 is made of I-shaped steel, the upper part of the rear top connecting rod 93 is anchored by a double-layer anchor gasket, and the rear top connecting rod 93 and the support of the Bailey beam assembly 9 are fixed by U-shaped steel bars or bolts; the rear fixing bar 91 is made of four pieces of phi 32 finish-rolled threaded steel with one end being two.
In this embodiment, the branch connecting beam 11 is made of an i-shaped steel piece, the second capping beam 8 is horizontally arranged at intervals in the longitudinal direction, the top surface of the branch connecting beam 11 is horizontally arranged, and the top surface height is adapted to the bottom die mounting height of the side box beam cast-in-place section. The branch connecting beam 11 is paved by single-spliced 14I-steel at an interval of 30 cm.
In this embodiment, the bottom beam 12 is two oppositely opened v-shaped 21274, the two Contraband-shaped pieces are connected by a front fastener 13; the top surface height of the bottom beam 12 is adapted to the bottom surface height of the branch connecting beam 11. The top surface of the bottom beam 12 is provided with a shallow groove clamping connection coupling beam 11 and a Bailey beam assembly 9.
In this embodiment, the bailey beam assembly 9 is formed by segment splicing, 321 bailey frames are used as cantilever beams, and the transverse rows are combined by 45# flower stands. Each section of the bailey beam assembly 9 comprises a cross beam 91 arranged in a square shape, vertical web members 102 connected to the upper and lower cross beams 91 in the longitudinal direction in a shape like a Chinese character 'mi', vertical web members 102 connected to two ends of the left and right cross beams 91 in an X shape, and reinforcing members 103 connected to connection nodes of the vertical web members 102 in the shape like the Chinese character 'mi' or the X shape. The top of the cross beam 91 is also connected with a reinforcing chord 104 by bolts along the length direction, the reinforcing chord 104 is a V-shaped 21274with two opposite openings, and the shaped steel part Contraband shaped part is formed by connecting; each cross beam 91 is provided at its ends with bolted lugs. The top of the Bailey beam assembly 9 is also connected with a support bracket, and the support bracket is used for detachably connecting a side mold and a wing plate mold of the side span cast-in-place section.
In this embodiment, the front fixing member 13 comprises a front fixing rod 131 connected between two Contraband-shaped members of the top cross-connecting beam 91 and having a bottom cross-connected between two Contraband-shaped members of the bottom beam 12, and a front top connecting member 132 connected to the tops of the two cross-beams 91 on the same side; the front fixing member 13 is connected to the front top link 132 by a detachable fixing nut, and is fastened to the floor beam 12 by a link plate and a fixing nut attached to the lower side of the floor beam 12. The tie plate length is no less than the width of the single Contraband-shaped piece of the sill 12 and is symmetrically connected across the two Contraband-shaped pieces.
In this embodiment, the top of the connector 92 is mechanically connected to the rear fixing rod 91, and the bottom of the connector 92 is provided with a displacement sensor and a stress sensor, both of which are connected to the remote computer.
With reference to fig. 1 to 13, a construction method of the side span cast-in-place section cantilever bearing system is further described, which specifically comprises the following steps:
cleaning and leveling the top surface of a cover beam of a side span box beam to be poured, and marking the installation position of a Bailey beam assembly 9 in advance; connectors 92 are pre-buried on bearing platforms at the lower parts of the capping beams to be cast, rod pieces are arranged at the lower parts of the connectors 92 and are fixed on the capping beams, and displacement sensors and stress sensors are pre-installed on the rod pieces at the lower parts of the connectors 92.
Secondly, two groups of Bailey beam assemblies 9 corresponding to two ends of the bottom die to be installed are manufactured respectively based on the size of the cover beam and the width of the bottom die to be installed, each group of Bailey beam assemblies 9 is composed of two rows of Bailey beam assemblies 9, and each row of Bailey beam assemblies 9 are assembled on the ground and determined according to the design length of the side span beam; and each group of adjacent Bailey beam assemblies 9 are integrally connected through connecting rods or connecting plates.
In the second step, when the bailey beam assembly 9 is installed, ejector rods are fixedly connected to two sides of the connecting end of the bailey beam assembly 9 of the adjacent section in the longitudinal direction, the ejector rods are X-shaped rigid rods, and the ejector rods are arranged in parallel up and down on the bailey beam assembly 9 to limit the lateral deviation of the bailey beam assembly 9.
And step three, connecting the lower parts of the front ends of the two groups of Bailey beam assemblies 9 with the bottom beams 12, vertically installing the front top connecting piece 132 on the reinforcing chord 104 of the Bailey beam assembly 9, penetrating the front fixing rod 131 through the middle gaps of the front top connecting piece 132, the Bailey beam assembly 9 and the bottom beams 12, and fixedly connecting the two ends of the front fixing rod 131 through fixing plates and nuts respectively.
Fourthly, mounting a rear fixing rod 91 and a lateral temporary support and a protective net on the pre-buried connector 92, then sequentially hoisting the Bailey beam assembly 9 to the cover beam, and connecting the bottom of the Bailey beam assembly 9 with the top surface of the cover beam through a connecting plate bolt; the top of the rear fixing rod 91 penetrates through the Bailey beam assembly 9, and then the rear top connecting piece 93 penetrates through the top of the rear fixing piece 9 and is installed on the Bailey beam assembly 9; the temporary support on the rear fixing rod 91 is removed after the fastening connection.
And fifthly, mounting rear top connecting rods 93 at the tops of the two ends of each group of Bailey beam assemblies 9, mounting rear fixing pieces 9 on the rear top connecting rods 93, temporarily fixing the tops of the rear fixing rods 91 through fixing plates and nuts, and fixing the nuts at the tops after the bottoms of the rear fixing rods 91 are connected with the alignment connectors 92.
Sixthly, rechecking the levelness of the Bailey beam assembly 9, and the levelness of the top surface of the bottom beam 12 and the top surface of the cover beam, then connecting the sub-connecting beam 11 between the bottom beam 12 and the cover beam, and rechecking and adjusting the levelness and the elevation of the top surface of the sub-connecting beam 11 after the installation is finished; after the requirements are met, the bamboo plywood is paved on the surface of the bottom die,
step seven, arranging a support bracket on the Bailey beam assembly 9, installing a side die and a wing plate die of the side beam to be cast, and completing the support of the bottom template of the beam body to be cast at the closure section of the cast box beam 5 through the support bracket; and then the beam body construction of the section to be poured is completed.
In addition, the integral bearing system is subjected to stress simulation through BIM software in advance, large stress and displacement points in the processes of installing a supporting bracket and pouring and maintaining are determined and optimized, the large stress and displacement points are controlled through a reinforcing part 103 and a limiting part, and a sensor and a displacement sensor are installed and controlled in real time in the construction process; in the third step, after the bottom beam 12 is installed and rechecked, at least the stress sensor and the displacement sensor are installed at the bottoms of the two ends of the bottom beam 12 and are connected with a remote computer in a control way; and when the upper load is large, the inclined strut is also arranged between the bottom beam 12 and the pier stud. Therefore, the device is convenient to control before installation and monitor and adjust in time during installation and use.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.
Claims (10)
1. The side span cast-in-place section cantilever bearing system is characterized by comprising a bearing platform on a pile foundation (1), a pier column connected to the bearing platform, a cover beam connected to the pier column, two groups of Bailey beam assemblies (9) respectively connected to two ends of the cover beam, a rear fixing member (9) connected between the rear end of each group of Bailey beam assemblies (9) and the cover beam, a bottom beam (12) vertically connected below the front ends of the two groups of Bailey beam assemblies (9), a front fixing member (13) connected between the front end of each group of Bailey beam assemblies (9) and the bottom beam (12), and a sub-connecting beam (11) connected between the cover beam and the bottom beam (12);
the rear end of the Bailey beam assembly (9) is connected to the cover beam, and the front end of the Bailey beam assembly extends in a cantilever shape to adapt to the length of a span of the side to be poured;
the rear fixing piece (9) comprises a rear fixing rod (91) connected between the top of the Bailey beam assembly (9) and the bearing platform, a connector (92) connected to the lower portion of the rear fixing rod (91) and embedded in advance, and a rear top connecting rod (93) detachably connected between two adjacent rear fixing rods (91) at the top of the Bailey beam assembly (9).
2. The side-span cast-in-place section cantilever load-bearing system according to claim 1, wherein the branch connecting beams (11) are arranged at intervals in the horizontal length direction of the bent cap, the top surfaces of the branch connecting beams (11) are horizontally arranged, and the height of the top surfaces is adapted to the installation height of the bottom die of the side-span beam cast-in-place section.
3. The side span cast-in-place section cantilever load-bearing system according to claim 2, wherein the bottom beam (12) is formed by connecting oppositely opened v-shaped pieces, and the front fixing piece (13) is connected between the two Contraband-shaped pieces in a penetrating way; the top surface of the bottom beam (12) is suitable for the bottom surface of the connecting beam (11); the top surface of the bottom beam (12) is provided with a shallow groove clamping connection coupling beam (11) and a Bailey beam assembly (9).
4. The side-span cast-in-place section cantilever load-bearing system according to claim 3, wherein the Bailey beam assembly (9) is formed by splicing segments, each segment of Bailey beam assembly (9) comprises cross beams (91) which are arranged in a square shape, vertical web members (102) which are connected with the upper and lower cross beams (91) and are in a shape of Chinese character mi in the length direction, vertical web members (102) which are connected with two ends of the left and right cross beams (91) and are in an X shape, and reinforcing members (103) which are connected with connecting nodes of the vertical web members (102) in the shape of Chinese character mi or X; the top of the cross beam (91) is also connected with a reinforcing chord member (104) along the length direction, the reinforcing chord member (104) is a V-shaped member (21274) with two opposite openings, and the shaped member (Contraband) is formed by connecting; the end of each beam (91) is provided with a lug plate which is connected by a bolt.
5. An edge-spanning cast-in-place section cantilever load-bearing system according to claim 4, wherein the front fixing member (13) comprises a front fixing rod (131) connected between two Contraband-shaped members of the top cross-connecting beam (91) and connected between two Contraband-shaped members of the bottom beam (12) at the bottom, and a front top connecting member (132) connected to the tops of the two beams (91) at the same side; the front fixing piece (13) is connected with the front top connecting piece (132) through a detachable fixing nut and is fixedly connected with the bottom beam (12) through a connecting plate and a fixing nut which are connected below the bottom beam (12); the tie plate length is no less than the width of a single Contraband-shaped piece of the bottom beam (12) and is symmetrically connected on two Contraband-shaped pieces.
6. The cantilever load-bearing system of the side-span cast-in-place section is characterized in that a support bracket is further connected to the top of the Bailey beam assembly (9), and the support bracket is used for detachably connecting a side mold and a wing plate mold of the side-span cast-in-place section.
7. The side-span cast-in-place section cantilever load-bearing system according to claim 1, wherein the top of the connector (92) is mechanically connected with the rear fixing rod (91), the bottom of the connector (92) is provided with a displacement sensor and a stress sensor, and the displacement sensor and the stress sensor are both connected with a remote computer control.
8. A construction method of the side span cast-in-place section cantilever load-bearing system according to any one of claims 1 to 7, characterized by comprising the following concrete steps:
cleaning and leveling the top surface of a cover beam of a side span box beam to be poured, and marking the mounting position of a Bailey beam assembly (9) in advance; pre-burying a connector (92) on a bearing platform at the lower part of a capping beam to be cast, wherein the lower part of the connector (92) is a rod piece and is fixed on the capping beam, and a displacement sensor and a stress sensor are pre-installed on the rod piece at the lower part of the connector (92);
secondly, two groups of Bailey beam assemblies (9) corresponding to two ends of the bottom die to be installed are manufactured respectively based on the size of the cover beam and the width of the bottom die to be installed, each group of Bailey beam assemblies (9) is composed of two rows of Bailey beam assemblies (9), and each row of Bailey beam assemblies (9) are assembled on the ground and determined according to the design length of the side span beam; each group of adjacent Bailey beam assemblies (9) are integrally connected through connecting rods or connecting plates;
thirdly, connecting the lower parts of the front ends of the two groups of Bailey beam assemblies (9) with the bottom beam (12), vertically installing a front top connecting piece (132) on a reinforcing chord (104) of the Bailey beam assembly (9), penetrating a front fixing rod (131) through the middle gaps of the front top connecting piece (132), the Bailey beam assemblies (9) and the bottom beam (12), and then fixedly connecting the two ends of the front fixing rod (131) through a fixing plate and a nut respectively;
fourthly, mounting a rear fixing rod (91) and a lateral temporary support and a protective net on the pre-buried connector (92), then sequentially hoisting the Bailey beam assembly (9) to the cover beam, and connecting the bottom of the Bailey beam assembly (9) with the top surface of the cover beam through a connecting plate bolt; the top of the rear fixing rod (91) penetrates through the Bailey beam assembly (9), and then the rear top connecting piece (93) penetrates through the top of the rear fixing piece (9) and is installed on the Bailey beam assembly (9); after the fastening connection, the temporary support on the rear fixing rod (91) is removed;
fifthly, rear top connecting rods (93) are installed at the tops of two ends of each group of Bailey beam assemblies (9), rear fixing pieces (9) are installed on the rear top connecting rods (93), the tops of the rear fixing rods (91) are temporarily fixed through fixing plates and nuts, and the nuts at the tops of the rear fixing rods (91) are fixed after the bottoms of the rear fixing rods (91) are aligned with the connectors (92) and connected;
sixthly, rechecking the levelness of the Bailey beam assembly (9), and the levelness of the top surface of the bottom beam (12) and the top surface of the cover beam, then connecting the sub-connecting beam (11) between the bottom beam (12) and the cover beam, and rechecking and adjusting the levelness and the elevation of the top surface of the sub-connecting beam (11) after the installation is finished; after the requirements are met, the bamboo plywood is paved on the surface of the bottom die,
seventhly, arranging a support bracket on the Bailey beam assembly (9), installing a side die and a wing plate die of the side beam to be cast, and completing the support of the bottom template at the closure section of the box beam (5) to be cast on the beam body to be cast through the support bracket; and then the beam body construction of the section to be poured is completed.
9. The construction method of the side-span cast-in-place section cantilever load-bearing system according to claim 8, wherein in the second step, when the Bailey beam assembly (9) is installed, the two sides of the connecting end of the Bailey beam assembly (9) of the adjacent section in the longitudinal direction are fixedly connected with the ejector rods, the ejector rods are X-shaped rigid rods, and the ejector rods are arranged in parallel up and down the Bailey beam assembly (9) to limit the lateral deviation of the Bailey beam assembly (9).
10. The construction method of the side-span cast-in-place section cantilever bearing system according to claim 8, characterized in that the whole bearing system is subjected to stress simulation in advance through BIM software, and the point with larger stress and displacement during the support bracket installation and the pouring maintenance process is determined and optimized, the point with larger stress and displacement is controlled through a reinforcing member (103) and a limiting member, and the sensor and the displacement sensor are installed and controlled in real time during construction; in the third step, after the bottom beam (12) is installed and rechecked, at least the bottoms of the two ends of the bottom beam (12) are provided with a stress sensor and a displacement sensor and are connected with a remote computer in a control way; and when the upper load is large, an inclined strut is also arranged between the bottom beam (12) and the pier stud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011599975.2A CN112627060A (en) | 2020-12-30 | 2020-12-30 | Side-span cast-in-place section cantilever bearing system and construction method thereof |
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