CN111827119A - Connecting structure of cast-in-situ variable cross-section beam body formwork and construction method thereof - Google Patents
Connecting structure of cast-in-situ variable cross-section beam body formwork and construction method thereof Download PDFInfo
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- CN111827119A CN111827119A CN202010677695.2A CN202010677695A CN111827119A CN 111827119 A CN111827119 A CN 111827119A CN 202010677695 A CN202010677695 A CN 202010677695A CN 111827119 A CN111827119 A CN 111827119A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
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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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Abstract
The invention discloses a connecting structure of a cast-in-place variable cross-section beam body template and a construction method thereof, wherein the connecting structure comprises a vertical connecting column, an upper connecting piece connected to the vertical connecting column, a Bailey beam connected to the upper part of the vertical connecting column, a support frame connected to the upper part of the Bailey beam and a corresponding beam body template; the Bailey beam is a linear beam and is in a zigzag shape along the length direction of the beam body to be cast, and a group of vertical braces are connected below the Bailey beam; the Bailey beams are connected at the bending points in an assembling way, are respectively connected with the vertical supports and the vertical connecting columns through bottom supporting and adjusting pieces, and are connected with the templates through top supporting and adjusting pieces. According to the invention, the vertical connecting columns, the vertical supports and the supporting frames are combined, so that the stress on the lower part of the template is favorably ensured; the invention can ensure the whole fixation through the arrangement of the connecting piece; due to the fact that the Bailey beams are arranged in a broken line shape, adaptive installation is facilitated according to beam body line shapes with different cross sections, installation accuracy is guaranteed, and construction quality is improved; and the joint setting of the bottom support adjusting piece and the top support adjusting piece is favorable for fine adjustment, and the construction precision is ensured.
Description
Technical Field
The invention belongs to the field of template engineering construction, and particularly relates to a connecting structure of a cast-in-place variable cross-section beam body template and a construction method thereof.
Background
With the development of national infrastructure, the construction of continuous beams in bridge engineering is numerous, and the traditional construction of a hanging basket method and the construction of a full framing method have many defects although the application is wide. The large-area support erection by the full-hall support method not only needs a large amount of cost and has certain requirements on geological conditions, but also influences traffic when passing through roads; the construction work surface of the hanging basket method is few, the construction period is long, and the hanging basket method cannot be applied to the construction of the continuous beam with short construction period. In addition, due to the variable cross-section design of the bridge, the lower support needs to be adaptively adjusted according to the line type of the bridge, so that a connection frame body structure which can be conveniently constructed and can be adaptively constructed according to the line type of the bridge and a construction method thereof are needed.
Disclosure of Invention
The invention provides a connecting structure of a cast-in-place variable cross-section beam body template and a construction method thereof, which are used for solving the technical problems of simple installation of a lower frame body and a support system, fixed installation of a connecting frame body and a support structure, adaptation of a Bailey beam to the beam body line type and the like when a high-altitude template is erected in a variable cross-section bridge engineering.
In order to achieve the purpose, the invention adopts the following technical scheme:
a connecting structure of a cast-in-situ variable cross-section beam body template comprises vertical connecting columns connected to one side of a side pier or two sides of a middle pier, connecting pieces connected between the vertical connecting columns and the side pier or between the vertical connecting columns and the middle pier, a Bailey beam connected to the upper part of each vertical connecting column, a support frame connected to the upper part of the Bailey beam, and templates connected to the top of the Bailey beam, the top of the support frame and the side edges of the Bailey beam at the outer contour line of a beam body to be cast;
the Bailey beam is a linear beam and is in a zigzag shape along the length direction of a beam body to be cast, and a group of vertical braces are connected below the Bailey beam; the Bailey beams are spliced and connected at the bending points, the Bailey beams are respectively connected with the vertical supports and the vertical connecting columns through bottom supporting and adjusting pieces below splicing positions, and the Bailey beams are connected with the templates through top supporting and adjusting pieces above the splicing positions.
Furthermore, the bottom supporting and adjusting part is connected to the top of the vertical connecting column and the top of the vertical support and is arranged in a one-to-one correspondence mode, and the bottom supporting and adjusting part is an adjustable sleeve or a jack.
Furthermore, the bottom support adjusting piece is connected with a bottom cross beam in the vertical direction along the beam body, and the bottom cross beam is detachably connected below the Bailey beam; the included angle of the joint between the bottom cross beam and the Bailey beam is not more than 5 degrees, and a lateral baffle is arranged on the side edge of the Bailey beam on the bottom cross beam.
Furthermore, the Bailey beams are assembled at the bending points and connected through connecting plates, bolts or sleeves, and wedge-shaped cushion blocks are further arranged at the bending external corners.
Further, a top cross rod is connected between the top of the Bailey beam and the corresponding template, and the top cross rod is a square wood or steel square pipe; the top cross bars are arranged in the length direction of the template at intervals.
Furthermore, a top support adjusting piece is connected between the top of the Bailey beam and the top cross rod, and the top support adjusting piece is an I-shaped piece, an H-shaped piece or a channel steel.
Furthermore, embedded parts are embedded in the corresponding connecting parts on the side bridge piers and the middle bridge piers in advance and are detachably connected with the connecting parts through the embedded parts; the connecting piece is rod-shaped.
Furthermore, the vertical connecting columns on two sides of the middle bridge pier are at least provided with a group of transverse connecting pieces, and the transverse connecting pieces are arranged on the middle upper parts of the vertical connecting columns.
Furthermore, the vertical braces are arranged at intervals in the length direction of the beam body, the vertical braces adjacent to each other in the length direction of the beam body are detachably connected with transverse connecting pieces, and reinforcing pieces are detachably connected between the vertical braces and the adjacent vertical braces of the beam body; the transverse connecting piece and the reinforcing piece are rod pieces.
Furthermore, the support frame is a net-shaped truss formed by connecting a cross rod, a vertical rod and an inclined rod through fasteners, and the joint of the top of the vertical rod in the support frame and the corresponding template is detachably connected with an adjusting sleeve; the periphery of the support frame is also connected with a surrounding baffle.
Further, a construction method of a connecting structure of a cast-in-place variable cross-section beam body formwork comprises the following specific steps:
step one, according to the address investigation condition, a plane control network is established on a construction site, the area of the control network is larger than the construction range, and the influence on the change of a control point during construction is eliminated;
secondly, pouring a strip foundation in the construction range, embedding a steel plate on the strip foundation in advance, and connecting the vertical connecting column with the middle bridge pier or the side bridge pier through a connecting piece; then, installing vertical braces, pouring a strip-shaped foundation on the lower parts of the vertical braces, and connecting the vertical braces through transverse connecting pieces and reinforcing pieces to ensure the integrity of the supporting of the vertical braces;
thirdly, welding a sandbox on the top of the vertical support, installing a bottom support and a bottom cross beam on the upper part of the sandbox, and installing a Bailey beam on the upper part of the bottom cross beam; the bottom support adjusting piece is an adjustable sleeve or a jack and is controlled electrically or manually;
fourthly, the Bailey beams are arranged in a zigzag shape according to the line shape of the cast-in-place beam body, the flower windows connected with the Bailey beams at the folding points are opened, the Bailey beams on two sides of the folding points are crossed with each other, the flower windows are made of channel steel at the folding points, and bolts are used for connecting the oblique Bailey beams;
installing a top support and adjustment part and a top cross rod on the upper part of the Bailey beam, installing battens and templates on the top cross rod corresponding to the bottom of the cast-in-place beam body, installing support frames corresponding to the side edge and the flange of the cast-in-place beam body, installing the templates on the side edge and the flange of the cast-in-place beam body through the support frames, and arranging a fence on the top of the support frames;
step six, after the beam body is poured and maintained, the connecting structure is disassembled, and the disassembly is carried out in a staged circulating mode according to the principle that longitudinal bridge direction symmetrical balance, transverse bridge direction basic synchronization and first assembly and then disassembly are carried out during the disassembly; the method comprises the following steps that firstly, a Bailey beam is dropped on the lower portion of a beam body through a hoisting device, a lower portion structure is dismantled, and then the Bailey beam is lowered to the ground through the hoisting device to be dismantled; when the Bailey beam is hoisted, holes are drilled in the flange plates of the beam body, transverse prestressed pipelines are avoided during drilling, the Bailey beam is hoisted on the beam body by utilizing finish-rolled deformed steel bars and screw jacks, the lower structure of the Bailey beam is firstly disassembled, and then the Bailey beam is lowered to the ground to be disassembled.
The invention has the beneficial effects that:
1) according to the invention, through the combined arrangement of the vertical connecting columns, the vertical supports and the supporting frames, the frame body and the supporting system are favorably formed to ensure the stress of the lower part of the template, and the vertical connecting columns, the vertical supports and the supporting frames are convenient to install and construct, so that the construction period can be effectively reduced;
2) the invention can ensure the integral fixation through the arrangement of the connecting pieces, saves large-area foundation treatment for installation and fixation, effectively utilizes the bridge piers and reduces the construction cost;
3) according to the invention, through the fold line-shaped arrangement of the Bailey beams, the adaptive installation is favorably carried out according to the beam body line type of different cross sections, the installation precision is ensured, the construction quality is improved, and the adjustment of the line type through the support due to the parallel arrangement of the Bailey beams is avoided, so that the construction material is saved, and the construction progress is accelerated; the bottom support adjusting piece and the top support adjusting piece are jointly arranged, so that the installation of the Bailey beam in the vertical direction can be finely adjusted, and the construction precision is ensured;
in addition, the method is easy to implement, can greatly save the construction period and provide the precision and quality of the installed template, and is easy to adapt to the field construction environment; 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 connecting structure of a cast-in-place variable cross-section beam body formwork;
FIG. 2 is a partial schematic view of the construction of a connecting structure of a cast-in-place variable cross-section beam body formwork;
FIG. 3 is a cross-sectional construction view of a connecting structure of a cast-in-place variable cross-section beam body formwork;
fig. 4 is a partial construction schematic view of a cross section of a connecting structure of a cast-in-place variable cross-section beam body formwork.
Reference numerals: 1-side pier, 2-side foundation, 3-middle pier, 4-middle foundation, 5-vertical connecting column, 6-connecting piece, 7-vertical support, 8-horizontal connecting piece, 9-Bailey beam, 10-reinforcing piece, 11-bottom cross beam, 12-top cross beam, 13-supporting frame, 14-template, 15-enclosure, 16-beam body, 17-bottom support adjusting piece and 18-top support adjusting piece.
Detailed Description
Taking a concrete beam with a certain T-shaped deformation section as an example, as shown in fig. 1 and fig. 2, the concrete beam is the longitudinal direction of a beam body 16; fig. 3 and 4 are cross-sectional views of the bridge. The method comprises the steps of erecting a template 14 and then pouring the template 16 through a cast-in-place variable cross-section beam 16 connecting structure, wherein the connecting structure comprises vertical connecting columns 5 connected to one side of a side pier 1 or two sides of a middle pier 3, connecting pieces 6 connected between the vertical connecting columns 5 and the side pier 1 or between the vertical connecting columns 5 and the middle pier 3, a Bailey beam 9 connected to the upper portion of the vertical connecting columns 5, a support frame 13 connected to the upper portion of the Bailey beam 9 and a template 14 connected to the top of the Bailey beam 9, the top of the support frame 13 and the side edge of the outer contour line of the beam 16 to be poured. Wherein, the top of the supporting frame 13 is the lower surface of the flange plate of the beam body 16.
In this embodiment, a side foundation 2 is connected below the side pier 1, and a middle foundation 4 is connected below the middle pier 3. The side pier 1 and the middle pier 3 are embedded with embedded parts in advance corresponding to the connecting parts 6 and are detachably connected with the connecting parts 6 through the embedded parts; the connecting piece 6 is a steel rod piece, the embedded piece is a steel plate embedded piece, and the steel rod and the steel plate embedded piece are detachably connected through bolts. The vertical connecting columns 5 on two sides of the middle pier 3 are at least provided with a group of transverse connecting pieces 8, and the transverse connecting pieces 8 are arranged on the middle upper parts of the vertical connecting columns 5.
In this embodiment, the vertical braces 7 are steel pipe columns, each steel pipe is 630mm, the wall thickness of each steel pipe is 8mm, the height of the top of each steel pipe is linearly fitted in advance according to the beam 16, the steel pipe column supports are arranged at linear bending points, and the tops of the steel pipe columns are connected with sandboxes. The vertical braces 7 are arranged at intervals in the length direction of the beam body, the vertical braces 7 adjacent to each other in the length direction of the beam body 16 are detachably connected with transverse connecting pieces 8, and reinforcing pieces 10 are detachably connected between the vertical braces 7 adjacent to each other vertically and the beam body 16; the cross connecting piece 8 and the reinforcing piece 10 are both steel rod pieces, and the cross connecting piece 8 and the reinforcing piece 10. The reinforcing member 10 is a diagonal brace for enhancing the overall stability of the support system, and is connected with the vertical brace 7 through a fastener respectively.
In the embodiment, the support frame 13 is a net-shaped truss formed by connecting a transverse steel rod, a vertical steel rod and an inclined steel rod through fasteners, and the connecting part of the top of the vertical steel rod in the support frame 13 and the corresponding template 14 is in threaded connection with an adjusting sleeve; the periphery of the supporting frame 13 is also connected with a surrounding baffle 15.
In the embodiment, the Bailey beam 9 is a linear beam and is in a zigzag shape along the length direction of the beam body 16 to be cast, and a group of vertical braces 7 are connected below the Bailey beam 9; the Bailey beams 9 are assembled at the bending points and connected through connecting plates, bolts or sleeves, and wedge-shaped cushion blocks are further arranged at the bending external corners. A top cross bar 12 is also connected between the top of the Bailey beam 9 and the corresponding template 14, and the top cross bar 12 is a square wood or steel square pipe; the top rails 12 are spaced lengthwise of the form 14. The Bailey beams 9 are connected at the bending points in an assembling way, the Bailey beams 9 are respectively connected with the vertical supports 7 and the vertical connecting columns 5 through bottom supporting and adjusting pieces 17 below the assembling place, and the Bailey beams 9 are connected with the templates 14 through top supporting and adjusting pieces 18 above the assembling place.
In this embodiment, a top support adjusting part 18 is connected between the top of the bailey beam 9 and the top cross bar 12, and the top support adjusting part 18 is an i-shaped part, an H-shaped part or a channel steel. The bottom supporting and adjusting parts 17 are connected to the tops of the vertical connecting columns 5 and the vertical supports 7 and are arranged in a one-to-one correspondence mode, and the bottom supporting and adjusting parts 17 are adjustable sleeves or jacks. The bottom support adjusting piece 17 is vertically connected with a bottom cross beam 11 along the beam body 16, and the bottom cross beam 11 is detachably connected below the Bailey beam 9; an included angle of a connecting part between the bottom cross beam 11 and the Bailey beam 9 is not more than 5 degrees, and a lateral baffle is arranged on the bottom cross beam 11 at the side edge of the Bailey beam 9. Wherein, the bottom beam 11 is an I-shaped steel beam, an H-shaped steel beam or a channel steel.
With reference to fig. 1 to 4, a construction method of a connection structure of a cast-in-place variable cross-section beam body formwork is further described, which specifically includes the following steps:
step one, according to the address investigation condition, a plane control network is established on a construction site, the area of the control network is larger than the construction range, and the influence on the change of a control point during construction is eliminated.
Secondly, pouring a strip foundation in the construction range, embedding a steel plate on the strip foundation in advance, and respectively connecting the vertical connecting column 5 with the middle bridge pier 3 or the side bridge pier 1 through a connecting piece 6; then, the vertical support 7 is installed, a strip foundation is poured on the lower portion of the vertical support 7, and the vertical support 7 is connected with the reinforcing piece 10 through the transverse connecting piece 8, so that the supporting integrity of the vertical support 7 is guaranteed.
Thirdly, welding a sandbox on the top of the vertical support 7, wherein the sandbox is manufactured uniformly according to the height of 30cm or is subjected to adaptive adjustment according to the site, a bottom support adjusting piece 17 and a bottom cross beam 11 are installed on the upper portion of the sandbox, and a Bailey beam 9 is installed on the upper portion of the bottom cross beam 11; the bottom support adjusting piece 17 is an adjustable sleeve or a jack and is controlled electrically or manually.
Fourthly, the Bailey beams 9 are arranged in a zigzag shape according to the line shape of the cast-in-place beam body 16, the flower windows connected with the Bailey beams 9 at the folding points are opened, the Bailey beams 9 on the two sides of the folding points are crossed with each other, the flower windows are made of channel steel at the folding points, and the oblique Bailey beams 9 are connected through bolts.
And fifthly, mounting a top support adjusting part 18 and a top cross bar 12 on the upper part of the Bailey beam 9, mounting battens and templates 14 on the top cross bar 12 corresponding to the bottom of the cast-in-place beam body 16, mounting support frames 13 corresponding to the side edges and the flanges of the cast-in-place beam body 16, mounting the templates 14 on the side edges and the flanges of the cast-in-place beam body 16 through the support frames 13, and arranging a fence 15 on the top of the support frames 13.
Step six, after the beam body 16 is poured and maintained, the connecting structure is dismantled, and the dismantling is carried out in a staged circulating mode according to the principle of 'longitudinal bridge symmetrical balance, horizontal bridge basic synchronization and first assembling and then disassembling' during the dismantling; the Bailey beam 9 is dropped on the lower part of the beam body 16 by using a hoisting device, the lower part structure is firstly dismantled, and then the Bailey beam 9 is lowered to the ground by using the hoisting device to be dismantled; when the Bailey beam 9 is hoisted, holes are drilled in the flange plates of the beam body 16, transverse prestressed pipelines are avoided during drilling, the Bailey beam 9 is hoisted on the beam body 16 by utilizing finish-rolled deformed steel bars and screw jacks, the lower structure of the Bailey beam is firstly disassembled, and then the Bailey beam 9 is lowered to the ground to be disassembled.
Compared with the full framing method, the invention saves large-area foundation treatment, has small construction difficulty and low cost, and has shorter construction period than the basket hanging method. Adopt the curve of bailey beam 9 to arrange adaptation roof beam bottom pitch arc, roof beam bottom formwork 14 directly lays on top horizontal pole 12, when saving the scaffold, also saves and sets up the scaffold time, compares with traditional full hall support, and template 14 directly lays and has increased support overall stability in top horizontal pole 12 top. The elevation of the template 14 is formed by the vertical supports 7, the bottom supporting and adjusting pieces 17 and the top supporting and adjusting pieces 18, so that a large amount of time for determining the elevation can be saved.
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. A connecting structure of a cast-in-situ variable cross-section beam body template is characterized by comprising vertical connecting columns (5) connected to one side of a side pier (1) or two sides of a middle pier (3), connecting pieces (6) connected between the vertical connecting columns (5) and the side pier (1) or between the vertical connecting columns (5) and the middle pier (3), a Bailey beam (9) connected to the upper part of the vertical connecting columns (5), a support frame (13) connected to the upper part of the Bailey beam (9), and templates (14) connected to the top of the Bailey beam (9), the top of the support frame (13) and the side edges at the outer contour line of a beam body (16) to be cast;
the Bailey beam (9) is a linear beam and is in a zigzag shape along the length direction of a beam body to be cast, and a group of vertical braces (7) are connected below the Bailey beam (9); the Bailey beams (9) are spliced and connected at the bending points, the Bailey beams (9) are respectively connected with the vertical supports (7) and the vertical connecting columns (5) through bottom supporting and adjusting pieces (17) below the splicing positions, and the Bailey beams (9) are connected with the templates (14) through top supporting and adjusting pieces (18) above the splicing positions;
the bottom supporting and adjusting piece (17) is connected to the tops of the vertical connecting column (5) and the vertical support (7) and arranged in a one-to-one correspondence mode, the bottom supporting and adjusting piece (17) is vertically connected with a bottom cross beam (11) along the beam body (16), and the bottom cross beam (11) is detachably connected below the Bailey beam (9).
2. The connecting structure of the cast-in-place variable cross-section beam body formwork of claim 1, wherein an included angle of a connecting part between the bottom cross beam (11) and the Bailey beam (9) is not more than 5 degrees, and a lateral baffle is arranged on the bottom cross beam (11) at the side edge of the Bailey beam (9).
3. The connecting structure of the cast-in-place variable cross-section beam body formwork as claimed in claim 1, wherein the Bailey beam (9) is assembled at the bending point and connected through a connecting plate, a bolt or a sleeve, and wedge-shaped cushion blocks are further arranged at the bending external corners.
4. The connecting structure of the cast-in-place variable cross-section beam body formwork of claim 3, wherein a top cross bar (12) is further connected between the top of the Bailey beam (9) and the corresponding formwork (14), and the top cross bar (12) is a square wood or steel square pipe; the top cross bars (12) are arranged in the length direction of the template (14) at intervals.
5. The connecting structure of the cast-in-place variable cross-section beam body formwork of claim 4, wherein a top supporting and adjusting piece (18) is connected between the top of the Bailey beam (9) and the top cross rod (12), and the top supporting and adjusting piece (18) is an I-shaped piece, an H-shaped piece or a channel steel.
6. The connecting structure of a cast-in-place variable cross-section beam body template as claimed in claim 1, wherein embedded parts are embedded in advance in the corresponding connecting parts (6) on the side pier (1) and the middle pier (3), and are detachably connected with the connecting parts (6) through the embedded parts; the connecting piece (6) is rod-shaped.
7. A connecting structure of a cast-in-place variable cross-section beam body formwork as claimed in claim 1, wherein the vertical connecting columns (5) at both sides of the middle bridge pier (3) are provided with at least one group of transverse connecting pieces (8), and the transverse connecting pieces (6) are arranged at the middle upper parts of the vertical connecting columns (5).
8. A connecting structure of a cast-in-place variable cross-section beam body formwork as claimed in claim 7, wherein the vertical braces (7) are arranged at intervals in the length direction of the beam body (16), the vertical braces (7) adjacent to each other in the length direction of the beam body (16) are detachably connected with cross connecting pieces (8), and reinforcing pieces (10) are detachably connected between the vertical braces (7) adjacent to the beam body (16); the transverse connecting piece (8) and the reinforcing piece (10) are rod pieces.
9. The connecting structure of the cast-in-place variable cross-section beam body formwork of claim 1, wherein the supporting frame (13) is a net truss formed by connecting cross rods, vertical rods and inclined rods through fasteners, and the connecting part of the top of the vertical rod in the supporting frame (13) and the corresponding formwork (14) is detachably connected with an adjusting sleeve; the periphery of the support frame (13) is also connected with a surrounding baffle (15).
10. A construction method of a connection structure of a cast-in-place variable cross-section beam body formwork according to any one of claims 1 to 9, characterized by comprising the following specific steps:
step one, according to the address investigation condition, a plane control network is established on a construction site, the area of the control network is larger than the construction range, and the influence on the change of a control point during construction is eliminated;
secondly, pouring a strip foundation in the construction range, embedding a steel plate on the strip foundation in advance, and connecting the vertical connecting column (5) with the middle pier (3) or the side pier (1) through a connecting piece (6) respectively; then, installing vertical braces (7), pouring a strip foundation on the lower parts of the vertical braces (7) in the same way, and connecting the vertical braces (7) through transverse connecting pieces (8) and reinforcing pieces (10) to ensure the supporting integrity of the vertical braces (7);
thirdly, welding a sandbox on the top of the vertical support (7), installing a bottom support piece (17) and a bottom cross beam (11) on the upper part of the sandbox, and installing a Bailey beam (9) on the upper part of the bottom cross beam (11); wherein the bottom support adjusting piece (17) is an adjustable sleeve or a jack and is controlled electrically or manually;
fourthly, the Bailey beams (9) are arranged in a zigzag shape according to the line type of the cast-in-place beam body (16), the flower windows connected with the Bailey beams (9) at the folding points are opened, the Bailey beams (9) on the two sides of the folding points are mutually crossed, the flower windows are made of channel steel at the folding points, and the obliquely crossed Bailey beams (9) are connected through bolts;
installing a top support adjusting part (18) and a top cross bar (12) on the upper part of the Bailey beam (9), installing battens and templates (14) on the top cross bar (12) corresponding to the bottom of the cast-in-place beam body (16), installing support frames (13) corresponding to the side edges and the flanges of the cast-in-place beam body (16), installing the templates (14) on the side edges and the flanges of the cast-in-place beam body (16) through the support frames (13), and arranging a fence (15) on the top of the support frames (13);
step six, after the beam body (16) is poured and maintained, the connecting structure is dismantled, and the dismantling is carried out in a staged circulating mode according to the principle of 'longitudinal bridge symmetrical balance, transverse bridge basic synchronization and first assembling and then disassembling' during the dismantling; the Bailey beam (9) is dropped on the lower part of the beam body (16) by using a hoisting device, the lower part structure is firstly dismantled, and then the Bailey beam (9) is lowered to the ground by using the hoisting device to be dismantled; when the Bailey beam (9) is hoisted, holes are drilled in the flange plate of the beam body (16), the transverse prestressed pipeline is avoided during drilling, the Bailey beam (9) is hoisted on the beam body (16) by utilizing finish-rolled deformed steel bars and screw jacks, the lower structure of the Bailey beam is firstly disassembled, and then the Bailey beam (9) is lowered to the ground to be disassembled.
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| CN112554063A (en) * | 2020-11-27 | 2021-03-26 | 中交路桥建设有限公司 | Turning method for cast-in-situ beam composite support with long span, small radius and high pier |
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