CN109338894B - Construction method for pouring wide and narrow box girder by movable formwork - Google Patents
Construction method for pouring wide and narrow box girder by movable formwork Download PDFInfo
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- CN109338894B CN109338894B CN201811401701.0A CN201811401701A CN109338894B CN 109338894 B CN109338894 B CN 109338894B CN 201811401701 A CN201811401701 A CN 201811401701A CN 109338894 B CN109338894 B CN 109338894B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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Abstract
The invention belongs to the technical field of bridge construction, and particularly relates to a construction method for pouring a wide and narrow box girder by using a movable formwork. The method comprises the following steps: s100, modifying the movable mold frame. S101, modifying a cantilever beam suspension arm, S102, setting a horizontal beam fixing hole of the cantilever beam suspension arm, S103, symmetrically fixing the cantilever beam suspension arm on two sides of a main beam, S104, additionally arranging a hanging beam opposite support, S105, modifying the hanging beam, and S200, moving a mould frame to erect a narrow box beam for construction. S300, erecting the wide box girder by the movable formwork. The construction method provided by the invention improves the utilization rate of equipment. By adopting the construction method, other box girder construction methods are not needed, and material equipment needed by other construction methods is saved.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a construction method for pouring a wide and narrow box girder by using a movable formwork.
Background
In recent years, with the strong investment construction of national highways and railways, the movable formwork is widely used as a common bridge concrete cast-in-place device, however, in different lines, the width of box girders is often different, for example, a high-speed railway box girder is usually a single box girder, and in some special sections, for example, line bifurcation sections, a double-box girder with a slightly larger width is designed, on a highway bridge, the double-box girder is more common, the movable formwork designed for the standard width cannot be used when a wide box girder is encountered, and usually, additional equipment or a construction method needs to be adjusted, so that the allocation of materials such as equipment resources and templates of enterprises is difficult, and the construction cost is inevitably increased.
The traditional construction method of the movable formwork has the following defects:
1. when the wide box girder appears on the line or the adjacent construction site is the wide box girder, the construction can not be carried out, and the utilization rate of equipment is low.
2. The movable formwork is large in size and weight, difficult to transition, long in transition period, the transition times are directly related to the construction cost, the transition times are increased when a wide box girder is met, the construction cost is increased, and the construction period is prolonged.
3. The disassembly of the movable mould frame during transition reduces the service life of the equipment and the economical efficiency and safety of the movable mould frame.
Therefore, it is necessary to research a construction method which can be used for constructing a common narrow box girder section on a line and can be suitable for constructing a wide box girder and pouring the box girder by using a movable formwork.
Disclosure of Invention
The invention provides a construction method for pouring wide and narrow box girders by using a movable formwork, aiming at solving the problems.
The invention adopts the following technical scheme: a construction method for pouring wide and narrow box girders by using a movable formwork comprises the following steps:
s100, modifying the movable mold frame.
S101, modifying the cantilever beam suspension arm, wherein the length of the cantilever beam suspension arm on the side of the movable die carrier, which needs to be lengthened, is one half of the width of the wide pier and the width of the narrow pier, the lengthened section of the horizontal beam of the cantilever beam suspension arm is made of the material with the same size as the horizontal beam of the original movable die carrier, the lengthened section is welded, the upper surface of the lengthened section is polished to be smooth after welding, an inclined support is additionally arranged below the horizontal beam of the cantilever beam suspension arm, the upper end of the newly-increased inclined support is supported at the tail end of the horizontal beam, and the lower end of the inclined support is.
S102, horizontal beam fixing holes of the cantilever boom are formed, after the cantilever boom is lengthened, in order to meet the requirement of increased transverse movement distance, transverse movement jack fixing holes are needed to be additionally formed in the horizontal beam, the hole distance between the jack fixing holes and the front fixing holes is the same as that of the fixing holes in the original horizontal beam of the movable cross frame, and the cantilever boom on the side of the movable die frame needs to be lengthened and modified.
S103, symmetrically fixing the cantilever beam suspension arms on two sides of the main beams, when a wide box girder is constructed, the tops of the hanging beams on two sides cannot transversely move to the main beams to be fixed, arranging a cross brace to penetrate through the middle of the two main beams, and reserving 4 square holes in the web plate of the main beam corresponding to each cantilever beam suspension arm for the hanging beam to penetrate through the square holes.
S104, hanging beam opposite supports are additionally arranged, when narrow box girders are constructed, after the hanging beams are assembled, the tops of the hanging beams on two sides transversely move to the main girders, the bottoms of the hanging beams are closed, concrete can be poured after the hanging beams are fixed to resist the vertical and lateral pressure of the concrete, and when wide box girders are constructed, the hanging beams are additionally arranged between the hanging beams on two sides to be supported and fixed.
S105, modifying the hanging beam, wherein 4 groups of 16 bolt holes are drilled in end plates on two sides of the top of the hanging beam, and the positions and the sizes of the bolt holes correspond to those of fixing bolt holes in a panel supported by a screw rod; the bottom of the hanging beam is lengthened, the lengthened section of the hanging beam is made of the same material and the same size as the original hanging beam, the lengthened section is hinged with the existing section through an ear plate, the hanging beam is stretched by an oil cylinder to realize vertical turning, a bottom die is attached to the lengthened section of the hanging beam, when the hanging beam is turned upwards, the bottom die is flush with the original bottom die, and the lengthened section of the hanging beam is arranged on one side of the movable die carrier; and the vertical beam part on the outer side of the hanging beam is weighted to offset the moment generated by the hanging beam at the hanging point of the cantilever beam suspension arm due to the inward movement of the centroid.
S200, erecting a narrow box girder by the movable formwork.
S201, preparing for construction; and the box girder cast-in-place construction can be carried out after the refitting of the movable formwork is finished, when a narrow girder is constructed, the beam hanging screw rod cross brace retracts, the lengthened section of the beam hanging base plate is turned down, and the front and rear support legs of the movable formwork are reinforced after the center of the movable formwork is adjusted.
S202, die assembly; and retracting an oil cylinder at the upper end of the cantilever beam suspension arm, slowly moving the side hanging beams at the two sides to the middle, directly closing the dies, and connecting the bottoms of the side hanging beams at the two sides.
S203, adjusting the box girder template.
S204, binding steel bars, pouring concrete, maintaining, opening the mold, moving forward, and preparing for the next cycle construction after moving forward.
S300, erecting the wide box girder by the movable formwork.
S301, when the wide box girder is constructed, firstly, the beam hanging screw rod cross brace retracts, then the beam hanging bottom oil cylinder extends, the lengthening section of the beam hanging bottom plate is turned upwards, the center of the movable formwork is adjusted, and then the front support leg and the rear support leg of the movable formwork are fixed.
S302, retracting the oil cylinder at the upper end of the cantilever beam suspension arm, slowly moving the hanging beams at the two sides to the middle, closing the lengthened section at one lengthened side of the hanging beam and the other lengthened side of the hanging beam, stopping retracting the oil cylinder at the upper end of the cantilever beam suspension arm, and connecting the bottoms of the hanging beams at the two sides.
S303-hang the roof beam end and connect the back, hang 4 screw stull extensions of roof beam with every group, reserve 4 quad slit from the web of girder and pass, to propping to hanging the roof beam end plate to adopt bolted connection with the hole that reserves when hanging the roof beam end plate repacking with the screw panel hole that props, to propping the back, both sides side is hung the roof beam and is formed the ring with the screw stull, bears various loads when wide case roof beam concrete placement.
S304, adjusting the height and the width of the box girder template according to the measurement lofting result, and connecting the bottom plates at the two sides with the templates attached to the lengthened section of the hanging girder to jointly form a wide box girder external mold.
S305, binding steel bars, pouring concrete and maintaining.
S306, opening the die after the concrete reaches the designed strength, before opening the die, removing the screw rod cross-brace bolt at the upper part of the hanging beam, removing the connection at the lower part of the hanging beam, turning down the lengthened section of the hanging beam, and then opening the die; when the die is opened, an oil cylinder at the upper end of the outrigger suspension arm is extended, the hanging beams at the two sides are slowly moved to the two sides until the opening width of the bottom of the hanging beam is larger than the width of the widened pier, the fixed end of the oil cylinder is sequentially fixed in a bolt hole of the outrigger suspension horizontal beam in the die opening process, and when the hanging beam is moved to the lengthened section of the outrigger suspension arm, the fixed end of the oil cylinder needs to be fixed in a fixed hole of the newly-lengthened outrigger suspension.
S307, after the die is opened, determining that the opening width of the suspended beam bottom is larger than the width of the widened pier, moving forwards, and preparing for the next cycle construction after the beam bottom is moved forwards.
In the step S104, the hanging beams adopt lead screws for oppositely supporting, each group of hanging beams adopts 4 lead screws, the lead screws are horizontally arranged for oppositely supporting, the lead screws are oppositely supported on two sides of the cantilever beam suspension arm, 1 lead screw is respectively arranged at the upper part and the lower part of each side, the two ends of each lead screw are provided with panels, each panel is drilled with 4 fixing bolt holes, and when the wide box girder is assembled, the tops of the hanging beams on the two sides are oppositely supported and fixed by the lead screws.
In the step S105, the counterweight is directly welded on the vertical beam of the hanging beam by using a steel plate, the counterweight weight is obtained through calculation, and after the counterweight is balanced, the centroid of the hanging beam needs to be kept within the range of the hanging point.
Compared with the prior art, the invention has the following beneficial effects:
1. the construction method can be adopted for construction on the line with the alternately arranged wide and narrow box girders, so that the utilization rate of equipment is improved. By adopting the construction method, other box girder construction methods are not needed, and material equipment needed by other construction methods is saved.
2. The method can also be used for construction by arranging lines of different types of box girders in nearby areas, frequent remote transition is not needed, the construction cost is reduced, and the construction period is also saved.
3. The movable mould frame only needs to be modified once, and the movable mould frame can be detached without meeting a wide box girder, so that the service life of the equipment is prolonged, and the economical efficiency and the safety of the movable mould frame are improved. .
4. The method can also expand the encountered methods, such as the working conditions of gate piers, piers with cover beams and the like with the width within the opening width of the movable formwork hanging beam after modification.
Drawings
FIG. 1 is a diagram of an original movable formwork;
FIG. 2 is a modification diagram of a cantilever beam and a suspension arm of the movable mould base;
FIG. 3 is a modified view of a main beam of the movable formwork;
FIG. 4 is a diagram of the movable formwork with additional hanging beam opposite support and hanging beam modification
FIG. 5 is a drawing of a mold opening for erecting a narrow box girder after the movable mold frame is modified;
FIG. 6 is a mold closing diagram for erecting a narrow box girder after the movable mold frame is modified;
FIG. 7 is a drawing of a mold opening for erecting a wide box girder after the movable mold frame is modified;
FIG. 8 is a drawing of a mold closing of the movable mold frame after being modified to erect a wide box girder;
FIG. 9 is a schematic view showing the positions of the holes reserved in the web of the main beam;
FIG. 10 is a lower enlarged view of the extension section of the bottom of the hanging beam;
FIG. 11 is a view showing a double-shaft hinged plate at the bottom extension section of the hanging beam;
FIG. 12 is a schematic view of the connection between a hanging beam and a screw rod cross brace;
in the figure, 1-outrigger boom, 2-main beam, 3-hanging beam, 4-box beam external mold, 5-hanging beam traversing oil cylinder, 6-narrow box beam, 7-narrow pier, 8-outrigger boom extension horizontal beam, 9-outrigger boom extension inclined strut, 10-extension inclined strut supporting position, 11-fixing hole added by outrigger boom horizontal beam, 12-main beam web plate reserved hole, 13-transverse strut screw rod, 14-hanging beam end surface reserved hole, 15-hanging beam counterweight, 16-hanging beam bottom plate extension section, 17-hanging beam bottom plate extension section template, 18-hinge system, 19-wide box beam, 20-wide pier, 21-double-shaft hinge plate, 22-hanging beam end plate, 23-main beam web plate and 24-screw rod transverse strut panel.
Detailed Description
A construction method for pouring wide and narrow box girders by using a movable formwork comprises the following steps.
S100, modifying a movable mold base:
s101, modifying the cantilever beam suspension arm 1;
the lengthening length of the cantilever beam suspension arm 1 is determined: the outrigger suspension arm 1 of the movable die carrier is fixed on the main beam 2 to provide support and transverse movement for the hanging beam 3 and the box girder external mold 4, when the hanging beam 3 is assembled, the outrigger suspension arm 1 is transversely moved towards the center, when the hanging beam 3 is opened, the hanging beam 3 is transversely moved towards two sides, so that the bottom end of the hanging beam and the box girder external mold 4 are opened to a certain width, the bridge pier 7 can be avoided when the hanging beam moves forwards, and the width of the wide bridge pier 20 corresponding to the wide box girder 19 is increased.
In order to adapt to the wide pier 20 under the wide box girder 19, the outrigger boom 1 needs to be lengthened, so that the opening width during mold opening meets the requirement of the over-wide pier 20, and the outrigger boom 1 on two sides of the movable mold frame can avoid the wide pier 20 during forward movement, therefore, the length of the extension of the outrigger boom 1 on two sides of the movable mold frame is half of the width of the wide pier 20 and the width of the narrow pier 6.
Lengthening cantilever beam suspension arm 1: the horizontal beam lengthening section of the cantilever crane arm 1 is made of a material with the same size as the horizontal beam of the original movable mould base, usually I-steel, the lengthening length of the horizontal beam of the cantilever crane arm 1 is determined by the length 1.1, the lengthening section is welded, and the upper surface of the welded lengthening section is polished to be flat so that the hanging beam can slide in a transverse moving mode.
And an inclined strut 9 of the lengthened section of the cantilever beam and the suspension arm is additionally arranged below a horizontal beam 8 of the lengthened section of the cantilever beam and the inclined strut 9 of the lengthened section of the cantilever beam and the suspension arm is made of a material with the same size as that of an original inclined strut material of the movable mould frame. The upper end of the inclined strut 9 of the lengthened section of the newly added cantilever beam suspension arm is supported at the tail end of the horizontal beam 8 of the lengthened section of the cantilever beam suspension arm, and the lower end of the inclined strut 9 of the lengthened section of the cantilever beam suspension arm is supported at the inclined strut supporting position 10 of the first node lengthened section of the original inclined strut, so that the transverse strut of the hanging beam 3 is not obstructed when the hanging beam 3 is assembled. Fully welding the newly added cantilever crane jib lengthening section inclined strut 9, the cantilever crane jib lengthening section horizontal beam 8 and the original inclined strut.
S102, arranging horizontal beam fixing holes 11 of the cantilever beam suspension arm: after the outrigger suspension arm 1 is lengthened, in order to meet the increased transverse movement distance, an outrigger suspension arm horizontal beam fixing hole 11 needs to be additionally arranged on a horizontal beam so as to meet the requirement of limited stroke of a transverse movement jack, and the hole distance between the outrigger suspension arm horizontal beam fixing hole 11 and a front fixing hole is the same as that of a fixing hole on an original movable cross frame horizontal beam. The outrigger suspension arms 1 at the two sides of the movable mould frame are required to be lengthened and modified.
S103, modifying the main beam 2, symmetrically fixing the outrigger suspension arms 1 on two sides of the main beam 2, and when constructing the wide box girder 19, the tops of the suspension beams 3 on two sides cannot be transversely moved to be fixed close to the web plates 23 of the main beams, so that a cross brace needs to be arranged and penetrates through the middle of the two main beams, and therefore 4 square holes need to be reserved in the web plates of the main beams corresponding to each outrigger suspension arm 1, so that the suspension beams 3 can penetrate through the square holes conveniently.
S104, additionally arranging a beam hanging screw rod opposite support 13; when the narrow box girder 6 is constructed, after the hanging girders 3 are assembled, the tops of the hanging girders 3 on two sides transversely move to the girder web plate 23, the bottoms close, and concrete can be poured after fixing to resist the vertical and lateral pressure of the concrete, and when the wide box girder 19 is constructed, the tops of the hanging girders 3 on two sides cannot transversely move to the girder web plate 23 to be fixed and cannot meet the force transmission requirement with the girder 2, so that the screw rod counter-stay 13 is required to be additionally arranged between the hanging girders 3 on two sides for fixing when the concrete is poured.
Adopt the lead screw to propping, every group hangs roof beam 3 and adopts 4 lead screw to propping 13, and the lead screw is to propping 13 level settings, and the lead screw is to propping 13 and being located 1 both sides of outrigger davit, respectively establishes 1 about every side, and lead screw stull panel 24 is established at lead screw stull 13 both ends, and every lead screw stull panel 24 bores has 4 fixing bolt holes, and when the wide case roof beam 19 compound die of construction, 3 tops of both sides string roof beams adopt the lead screw to prop 13 fixedly.
S105, modifying the hanging beam 3; the top of the hanging beam 3 is drilled, 4 groups of 16 bolt holes are drilled at the hanging beam end face plates 22 at the two sides of the top of the hanging beam, and the positions and the sizes of the bolt holes correspond to those of the fixing bolt holes in the screw rod cross-brace panel 24.
And (3) calculating the stability of the hanging beam, wherein the width of the wide box girder 19 is larger than that of the narrow box girder 6, the bottom of the hanging beam 3 needs to be correspondingly lengthened, the centroid of the lengthened section of the hanging beam bottom plate 16 and the lengthened section of the hanging beam bottom plate 17 is offset, so that the hanging beam counterweight 15 needs to be arranged, and after the weight of the lengthened section of the hanging beam bottom plate 16 and the lengthened section of the hanging beam bottom plate 17 and the weight of the hanging beam counterweight 15 are superposed, the centroid of the whole movable mould base is offset towards the lengthened side of the hanging beam 3. Therefore, the weight of the lengthened section and the weight of the balance weight need to be calculated before lengthening and modifying the bottom of the hanging beam 3, and after the weight of the lengthened section and the weight of the balance weight are superposed, the centroid of the whole movable formwork is kept among the support legs of the 2 main beams 2 of the movable formwork.
Because the whole weight of the movable mould base is large, under a general condition, after the hanging beam 3 on one side is lengthened and balanced, the centroid of the movable mould base can be kept between 2 main beam and 2 supporting legs of the movable mould base, if an extremely special condition exists, the centroid of the movable mould base can not be kept between 2 main beam and supporting legs of the movable mould base through calculation, the movable mould base is in a danger of overturning, and at the moment, the hanging beam 3 needs to be lengthened and balanced on two sides simultaneously so as to keep the movable mould base stable.
The bottom of the hanging beam 3 is lengthened; the bottom of the hanging beam 3 is correspondingly lengthened due to the increase of the width of the wide box girder 19, the method of the same material and size as the original hanging beam is adopted for the hanging beam bottom plate lengthening section 16, the hanging beam bottom plate lengthening section 16 is hinged with the existing section through the lug plate, the vertical turning is realized by the expansion and contraction of the oil cylinder of the hinging system 18, the hanging beam bottom plate lengthening section 16 is attached with a hanging beam bottom plate lengthening section template 17, and when the hanging beam bottom plate lengthening section template 17 is turned upwards, the hanging beam bottom plate lengthening section template is flush with the original bottom die. The hanging beam is lengthened on one side of the movable mould frame so as to reduce the lengthening workload and the configuration of the oil cylinder.
Hanging beam 3 for balancing weight; after the hanging beam 3 on one side of the movable mould frame is lengthened, the centroid of the hanging beam 3 is changed and moves towards the inner side of the movable mould frame, so that the balance weight of the beam part needs to be erected on the outer side of the hanging beam to offset the moment generated by the hanging beam 3 on the hanging point of the cantilever beam suspension arm 1 due to the inward movement of the centroid.
The hanging beam counterweight 15 is formed by directly welding a steel plate on a hanging beam vertical beam, the counterweight also increases the rigidity of the hanging beam, the weight of the hanging beam counterweight 15 is obtained by calculation, and after the counterweight is balanced, the centroid of the hanging beam 3 needs to be kept within the range of hanging points.
S200, erecting the narrow box girder 6 by the movable formwork.
S201-construction preparation: and after the movable formwork is refitted, the box girder cast-in-place construction can be carried out, when the narrow box girder 6 is constructed, the beam hanging screw rod cross brace 13 retracts, the beam hanging bottom plate lengthened section 16 is turned down, and after the center of the movable formwork is adjusted, the front and rear support legs of the movable formwork are reinforced.
S202, mold closing: and retracting an oil cylinder at the upper end of the cantilever beam suspension arm 1, slowly moving the hanging beams 3 at the two sides to the middle, directly closing the dies, and connecting the bottoms of the hanging beams at the two sides to increase the overall stability.
S203, adjusting the box girder template, and adjusting the height and the width of the box girder template according to the measurement lofting result.
S204, binding steel bars, pouring concrete, maintaining, opening the mold and moving forwards. The processes of binding reinforcing steel bars, pouring concrete, maintaining, opening the mold, moving forwards and the like are the same as the normal construction process of the movable mold frame, and are not described again here. And after the forward movement, preparing the next cycle of construction.
S300, erecting the wide box girder 19 by the movable formwork.
S301, preparing for construction, after the movable formwork is modified, when a wide box girder 19 is constructed, firstly retracting the beam hanging screw rod cross brace 13, then extending a beam hanging bottom oil cylinder, turning up the beam hanging bottom plate lengthened section 16 to enable a template 17 of the beam hanging bottom plate lengthened section to be level with the bottom of an original template, adjusting the center of the movable formwork, and then reinforcing front and rear support legs of the movable formwork.
S302, closing the dies, retracting the oil cylinders at the upper ends of the cantilever booms 1, slowly moving the hanging beams 3 at the two sides to the middle, lengthening the lengthening section at one side of the hanging beam 3, closing the dies at the other side, stopping retracting the oil cylinders at the upper ends of the cantilever booms, and connecting the bottoms of the hanging beams 2 at the sides to increase the overall stability. ,
s303, connecting the upper ends of the hanging beams, extending 4 screw cross braces of each hanging beam after the hanging beam bottom is connected, reserving 4 square holes from a web plate of the main beam to pass through, oppositely supporting the hanging beam end plates, connecting the screw cross brace panel 24 of the screw cross brace 13 with the reserved holes 14 on the end faces of the hanging beams by bolts, and after oppositely supporting, forming a ring by the hanging beams 13 on two sides and the screw cross braces 13 to bear various loads during concrete pouring of the wide box beam 19.
S304, adjusting the box girder template 4, adjusting the height and the width of the box girder template 4 according to the measurement lofting result, and connecting the bottom plates at two sides with the templates attached to the lengthened section of the hanging beam to jointly form a wide box girder outer mold.
S305, the processes of reinforcing steel bar binding, concrete pouring, curing, reinforcing steel bar binding, concrete pouring, curing and the like are the same as the normal construction process of the movable formwork, and are not repeated here.
S306, opening the mould, namely opening the mould after the concrete reaches the design strength, before opening the mould, firstly removing the bolt connection between the screw rod cross brace panel 24 of the screw rod cross brace 13 at the upper part of the hanging beam 3 and the preformed hole 14 of the end surface of the hanging beam, then removing the lower part connection of the hanging beam 3, downwards turning over the lengthened section 16 of the bottom plate of the hanging beam, and then opening the mould
When the die is opened, an oil cylinder at the upper end of the outrigger suspension arm 1 is extended, the outrigger 3 is slowly moved towards two sides until the opening width of the bottom of the outrigger 3 is larger than the width of the widened pier 20, the oil cylinder fixing end is sequentially fixed in a bolt hole of the outrigger suspension horizontal beam in the die opening process, and when the outrigger suspension arm is moved to the lengthened section, the oil cylinder fixing end needs to be fixed in a fixing hole 11 of the newly-lengthened outrigger suspension arm horizontal beam.
And S307, after the mold is opened, the bottom opening width of the hanging beam 3 is determined to be larger than the width of the wide pier 19, and then the hanging beam can move forwards, wherein the forward moving process is the same as the normal construction procedure of the movable mold frame, and the details are not repeated here. And after the forward movement, preparing the next cycle of construction.
The hanging beam is symmetrical on two sides, and a plurality of groups (generally 8-10 groups) are arranged on one movable formwork.
The modification is performed on all the hanging beams 3, not only on 1 group of hanging beams.
Claims (2)
1. A construction method for pouring wide and narrow box girders by using a movable formwork is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s100, modifying the movable mould frame;
s101, modifying the cantilever beam suspension arm, wherein the length of the cantilever beam suspension arm on the side of the movable mould base (2) needing to be lengthened is one half of the width of a pier, the lengthened section of the horizontal beam of the cantilever beam suspension arm is made of the same material as the horizontal beam of the original movable mould base in size, the lengthened section is welded, the upper surface of the lengthened section is polished to be flat after welding, an inclined support is additionally arranged below the horizontal beam of the cantilever beam suspension arm, the upper end of the newly-increased inclined support is supported at the tail end of the horizontal beam, and the lower end of the inclined support is supported at a first;
s102, horizontal beam fixing holes of the cantilever boom are arranged, after the cantilever boom is lengthened, in order to meet the requirement of increased transverse movement distance, transverse moving jack fixing holes are additionally arranged on the horizontal beam, the hole distance between the jack fixing holes and the front fixing holes is the same as that of the fixing holes in the horizontal beam of the original movable mould frame, and the cantilever boom on the side of the movable mould frame (2) needs to be lengthened and modified;
s103, symmetrically fixing cantilever beam suspension arms on two sides of a main beam, when a wide box girder is constructed, the tops of hanging beams on two sides cannot transversely move to the main beams to be fixed, arranging a cross brace to pass through the middle of the two main beams, and reserving 4 square holes in a web plate of the main beam corresponding to each cantilever beam suspension arm for the hanging beam to pass through the square holes;
s104, hanging beam opposite supports are additionally arranged, when narrow box girders are constructed, after the hanging beams are assembled, the tops of the hanging beams on two sides transversely move to the main girders, the bottoms of the hanging beams are closed, concrete can be poured after the hanging beams are fixed to resist the vertical and lateral pressure of the concrete, and when wide box girders are constructed, the hanging beams are additionally arranged between the hanging beams on two sides for opposite support and fixation;
s105, modifying the hanging beam, wherein 4 groups of 16 bolt holes are drilled in end plates on two sides of the top of the hanging beam, and the positions and the sizes of the bolt holes correspond to those of fixing bolt holes in a panel supported by a screw rod; the bottom of the hanging beam is lengthened, the lengthened section of the hanging beam is the same as the original hanging beam in material and size, the lengthened section is hinged with the existing section through an ear plate, the hanging beam is stretched and retracted by an oil cylinder to realize vertical turning, a bottom die is attached to the lengthened section of the hanging beam, when the hanging beam is turned upwards, the bottom die is flush with the original bottom die, and the lengthened section of the hanging beam is carried out on one side of the movable die carrier; the vertical beam part on the outer side of the hanging beam is weighted to offset the moment generated by the hanging beam at the hanging point of the cantilever beam suspension arm due to the inward movement of the centroid;
s200, erecting a narrow box girder by a movable formwork;
s201, preparing for construction; the box girder cast-in-place construction can be carried out after the modification of the movable formwork is finished, when a narrow girder is constructed, the beam hanging screw rod cross brace retracts, the lengthened section of the beam hanging bottom plate is turned downwards, and after the center of the movable formwork is adjusted, the front and rear support legs of the movable formwork are reinforced;
s202, die assembly; retracting an oil cylinder at the upper end of the cantilever beam suspension arm, slowly moving the hanging beams at the two sides to the middle, directly closing the dies, and connecting the bottoms of the hanging beams at the two sides;
s203, adjusting the box girder template;
s204, binding steel bars, pouring concrete, maintaining, opening the mold, moving forward, and preparing for the next cycle construction after moving forward;
s300, erecting a wide box girder by a movable formwork;
s301, when the wide box girder is constructed, firstly, a beam hanging screw rod cross brace retracts, then a beam hanging bottom oil cylinder extends, a beam hanging bottom plate lengthening section is turned upwards, and after the center of a movable formwork is adjusted, front and rear support legs of the movable formwork are reinforced;
s302, retracting an oil cylinder at the upper end of the cantilever beam suspension arm, slowly moving the hanging beams at two sides to the middle, closing the lengthened section at one lengthened side of the hanging beam and the other lengthened side of the hanging beam, stopping retracting the oil cylinder at the upper end of the cantilever beam suspension arm, and connecting the bottoms of the hanging beams at two sides;
s303, after connecting the bottoms of the hanging beams, extending 4 screw rod cross braces of each group of hanging beams, reserving 4 square holes from a web plate of the main beam to penetrate through, oppositely supporting the cross braces to the end plates of the hanging beams, connecting panel holes of the screw rod opposite supports with holes reserved when the end plates of the hanging beams are modified by bolts, and after oppositely supporting, forming rings by the hanging beams on two sides and the screw rod cross braces to bear various loads when the wide box girder is poured;
s304, adjusting the height and the width of the box girder template according to the measurement lofting result, and connecting bottom plates on two sides with templates attached to the lengthened section of the hanging girder to jointly form a wide box girder external mold;
s305-binding reinforcing steel bars, pouring concrete and maintaining;
s306, opening the die after the concrete reaches the designed strength, before opening the die, removing the screw rod cross-brace bolt at the upper part of the hanging beam, removing the connection at the lower part of the hanging beam, turning down the lengthened section of the hanging beam, and then opening the die; when the die is opened, extending an oil cylinder at the upper end of the outrigger suspension arm, slowly moving the suspension beams at two sides to two sides until the opening width of the bottom of the suspension beam is larger than the width of the widened pier, sequentially fixing the fixed end of the oil cylinder in a bolt hole of the outrigger suspension horizontal beam in the die opening process, and fixing the fixed end of the oil cylinder in a fixed hole of the newly-increased outrigger suspension arm horizontal beam when moving to the lengthened section of the outrigger suspension arm;
s307, after the die is opened, determining that the opening width of the suspended beam bottom is larger than the width of the widened pier, moving forwards, and preparing for the next cycle construction after the beam bottom is moved forwards.
2. The construction method for pouring the wide and narrow box girder by the movable formwork according to claim 1, is characterized in that: in the step S104, the hanging beams adopt lead screws for oppositely supporting, each group of hanging beams adopts 4 lead screws, the lead screws are horizontally arranged for oppositely supporting, the lead screws are oppositely supported on two sides of the cantilever beam suspension arm, 1 lead screw is respectively arranged at the upper part and the lower part of each side, the two ends of each lead screw are provided with panels, each panel is drilled with 4 fixing bolt holes, and when the wide box girder is assembled, the tops of the hanging beams on the two sides are oppositely supported and fixed by the lead screws.
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| CN110593120A (en) * | 2019-09-30 | 2019-12-20 | 中国十七冶集团有限公司 | Movable counterweight device for bridge closure and use method |
| CN112482226B (en) * | 2020-11-19 | 2022-07-15 | 中铁大桥局集团有限公司 | Construction method for changing height and span length of upstroke movable formwork |
| CN113047152B (en) * | 2021-05-18 | 2022-10-11 | 中铁四局集团有限公司 | Descending type double-span movable formwork and construction method |
| CN114525737B (en) * | 2022-03-03 | 2023-06-16 | 河南大学 | Bridge upper bearing type movable die carrier via hole braking system and braking method |
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