CN210507162U - Temporary device for maintaining mechanical balance under bridge construction process of arch-first and beam-second - Google Patents
Temporary device for maintaining mechanical balance under bridge construction process of arch-first and beam-second Download PDFInfo
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- CN210507162U CN210507162U CN201921307320.6U CN201921307320U CN210507162U CN 210507162 U CN210507162 U CN 210507162U CN 201921307320 U CN201921307320 U CN 201921307320U CN 210507162 U CN210507162 U CN 210507162U
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Abstract
The utility model discloses a temporary device for maintaining mechanical balance under the bridge construction process of a front arch back beam, which comprises two temporary tie bars and four temporary supports; each temporary tie bar is arranged between a pair of arch feet of the single arch rib; the four temporary supports are correspondingly arranged between the bottom surfaces of a pair of arch feet of the two arch ribs and the top surfaces of the two main piers one by one. Each temporary tie bar comprises two tie bar anchor boxes, two groups of anchors and four steel strands; the two tie rod anchor boxes are welded on the outer side surfaces of the pair of arch feet in a one-to-one correspondence and symmetrical mode; each tie rod anchor box comprises a top box body, an upper box body, a lower box body and a bottom box body; two groups of anchorage devices are correspondingly arranged on the two tie bar anchor boxes one by one; the four bundles of steel strands are connected between the two groups of anchorage devices in a one-to-one correspondence manner; each temporary support includes a pier top section and a beam bottom section. The utility model discloses an interim device plays critical effect to the construction safety and the proof mass of whole arch rib and girder, can also simplify the construction process, has guaranteed that the construction goes on smoothly.
Description
Technical Field
The utility model relates to a device is used in bridge construction, concretely relates to maintain balanced interim device of mechanics under preceding bridge construction process who encircles the back beam.
Background
The utility model relates to a full length 402.5m of bridge, the bridge span of main bridge is 230 meters, and the main bridge is long 233.2 meters, and the main bridge floor is wide 34.12 meters, and the both sides approach bridge is 169.3 meters altogether, and the approach bridge floor is wide 28.9 meters. The main bridge is a simply supported arch bridge of a through type and adopts a steel structure. The upper part of the main bridge comprises a main beam 4, two arch ribs 1, arch feet and a suspender 3. The main beam 4 comprises longitudinal beams, cross beams and bridge deck orthotropic plates 5. The main bridge pier 40 at the lower part of the main bridge adopts a portal frame structure pier body, and both the pier column and the pier top beam are box-shaped hollow sections (see fig. 1 and 2).
The girder 4 divides into 37 segmental constructions, and the longeron adopts the steel construction, box cross-section. The longitudinal beam is positioned on a vertical curve with the R being 4000m, and the projection of the longitudinal beam on the plane is a straight line; the crossbeams are arranged at intervals of 3m along the longitudinal direction of the bridge floor and correspond to the position of the suspender at intervals.
The two arch ribs are respectively arranged at the left side and the right side of the bridge floor, the arch ribs are in a basket form, the arch ribs are inwards inclined by 18 degrees, and the line form of the arch axis is a quadratic parabola; the arch rib adopts an equal-height box-shaped section; and transverse partition plates are arranged at intervals of about 2m along the longitudinal direction of the arch rib bottom. 7 permanent cross braces 2 are arranged between the two arch ribs; the arch foot is positioned at the joint section of the longitudinal beam and the arch rib. The single-channel arch rib is constructed by 37 sections, including arch feet at two ends.
A suspender: each side of the arch rib is provided with 35 suspenders; the longitudinal bridge spacing of the suspension rods is 6.0m, and the suspension rods are connected with the arch ribs and the longitudinal beam ear plates in a fork ear type anchoring mode.
Due to the limitation of terrain and other construction conditions, the main bridge adopts the sequence of 'arch first and girder later' to carry out construction and comprises the construction of the initial section of the main bridge, the construction process of a main beam in a support area, the construction process of arch ribs in the support area, the construction process of arch ribs in a splicing area, the construction process of a suspender, the construction process of a main beam in a splicing area, the construction process of a bridge deck and the construction process of system conversion, and the technical scheme is specifically disclosed in CN 108532465. The arch rib construction adopts a mode of 'asymmetric cable crane inclined pulling buckle hanging + support assembling', and the main beam construction adopts a mode of 'asymmetric cable crane + support assembling'. In the construction process of asymmetrically hoisting the arch rib section by section (see figure 1), the arch rib 2 is a long-span arch continuous beam in the hoisting process, and the self weight G of the arch rib section is receivediInfluence, the buckling ropes on both sides of the buckling tower 200 will generate an acting force FhiAnd Fki，FhiAnd FkiRespectively generate horizontal thrust in the transverse bridge direction and horizontal thrust F in the longitudinal bridge directionniAnd FxiHorizontal thrust in the transverse direction of the bridge is counteracted by a temporary transverse strut and a permanent transverse strut arranged between two arch ribs 2, and horizontal thrust in the longitudinal direction of the bridge FniAnd FxiThen the thrust is transmitted to the arch springing at the two ends of the arch rib and is transmitted to the main pier 40 (see figure 3) by the arch springing through the permanent support, and the horizontal thrust in the longitudinal direction of the bridge reaches 1400 tons at most before the main girder is closed, so that the main pier 40 cannot bear the thrust. In addition, because the bridge is asymmetrically hoisted arch rib segments, the longitudinal bridge horizontal thrust generated by the two banks is different, for example, 50 tons of longitudinal bridge horizontal thrust is generated when 17-18 sections of arch ribs on the south bank side are hoisted, and 11-12 sections of arch ribs on the north bank side are hoisted simultaneously with 17-18 sections of arch ribs on the south bank sideA 45 ton longitudinal horizontal thrust is generated, and the unbalanced thrust is transmitted to the single-side arch foot and needs to be borne by the permanent support and the stop block beside the support, so that the permanent support and the stop block cannot bear. In order to ensure the safety of the whole construction process, the influence of the longitudinal bridge direction horizontal thrust generated in the asymmetric hoisting construction on a permanent structure (an arch springing, a permanent support and a main pier) needs to be solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect and provide a maintain balanced interim device of mechanics under the arched bridge construction technology who encircles the back beam earlier, it plays critical effect to the construction safety and the proof mass of whole arch rib and girder, can also simplify the work progress, has guaranteed that the construction goes on smoothly.
The purpose of the utility model is realized like this: a temporary device for maintaining mechanical balance under a bridge construction process of arch first and girder second, wherein the bridge is a simply supported steel box arch bridge and comprises arch ribs, a hanging rod, a main girder and an orthogonal special-shaped bridge deck; the arch rib has two paths of up and down streams, the single-path arch rib comprises a pair of arch feet positioned at two ends of the single-path arch rib; the main beam is positioned between main piers of the two portal frame structures and comprises longitudinal beams and cross beams, the cross beams comprise two end cross beams and a plurality of general cross beams, the two end cross beams are correspondingly arranged between arch legs at two ends of two arch ribs one by one, and the general cross beams are longitudinally arranged along the bridge deck at intervals; the temporary device comprises two temporary tie bars and four temporary supports; each temporary tie bar is arranged between a pair of arch feet of the single arch rib; the four temporary supports are correspondingly arranged between the bottom surfaces of a pair of arch feet of the two arch ribs and the top surfaces of the two main piers one by one, wherein,
each temporary tie bar comprises two tie bar anchor boxes, two groups of anchors and four steel strands;
the two tie rod anchor boxes are welded on the outer side surfaces of the pair of arch feet in a one-to-one correspondence and symmetrical mode; each tie rod anchor box comprises a top plate and a bottom plate and is divided into a top box body, an upper box body, a lower box body and a bottom box body by an upper partition plate, a middle partition plate and a lower partition plate; the top rear box wall and the top front box wall of the top box body, the upper rear box wall and the upper front box wall of the upper box body, the lower rear box wall and the lower front box wall of the lower box body and the bottom rear box wall and the bottom front box wall of the bottom box body are respectively provided with a steel strand through hole; the distance from the steel strand bundle perforation on the top box body to the outer side face of the arch springing is the same as the distance from the steel strand bundle perforation on the upper box body to the outer side face of the arch springing; the distance from the steel strand bundle perforation on the lower box body to the outer side face of the arch springing is smaller than the distance from the steel strand bundle perforation on the upper box body to the outer side face of the arch springing; the distance from the steel strand bundle perforation on the bottom box body to the outer side face of the arch springing is smaller than the distance from the steel strand bundle perforation on the lower box body to the outer side face of the arch springing;
each group of anchorage devices are correspondingly arranged on the top rear box wall, the upper rear box wall, the lower rear box wall and the bottom rear box wall of each tie rod anchor box and correspond to the steel strand perforations on the top box body, the upper box body, the lower box body and the bottom box body one by one;
the four bundles of steel strands are connected between the two groups of anchorage devices in a one-to-one correspondence manner;
each temporary support comprises a pier top section and a beam bottom section;
the pier top section comprises two pre-embedded plates, two pier top bottom plates, two pier top panels, two pier top partition plates and four I-shaped steel; two pre-embedded plates are pre-embedded at the top of the main pier at intervals, and each pre-embedded plate is provided with a group of finish-rolled deformed steel bars with the lower parts pre-embedded in the main pier; the two pier top base plates are respectively arranged on the two embedded plates in a one-to-one correspondence manner through a group of finish rolling deformed steel bars and nuts; the two pier top panels are fixed at the inner ends of the two pier top bottom plates in a one-to-one correspondence manner; the two pier top partition plates are fixed at the outer ends of the two pier top bottom plates in a one-to-one correspondence manner; a plurality of pier top webs are respectively arranged between the outer surfaces of the two pier top panels and the inner surfaces of the two pier top partition plates in parallel, and concrete is poured into a cavity formed by the adjacent pier top webs, the pier top panels and the pier top partition plates; four I-shaped steel sections are welded between the inner surfaces of the lower parts of the two pier top panels in parallel;
the beam bottom section comprises two beam bottom panels, a plurality of beam bottom webs, a beam bottom base plate and two groups of beam bottom stiffening plates; the outer surfaces of the two beam bottom panels are respectively welded with the inner surfaces of the upper parts of the two pier top panels in a one-to-one correspondence way through a gap clapboard; a plurality of beam bottom webs are welded between the inner surfaces of the two beam bottom panels in parallel; the beam bottom backing plate is welded between the top surfaces of the two beam bottom panels and the bottom surfaces of the arch springing; the two groups of beam bottom stiffening plates are welded between the outer surfaces of the two beam bottom panels and the bottom surfaces of the arch springing in a one-to-one correspondence manner.
The temporary device for maintaining mechanical balance under the bridge construction process of the arch-first and the beam-second, wherein a top supporting plate with the same structure and size as those of the top box wall is arranged in the middle of the top box body; an upper supporting plate which has the same structure and size with the upper rear box wall is arranged in the middle of the upper box body; the middle part in the lower box body is provided with a lower supporting plate which has the same structure and size with the lower rear box wall; a bottom supporting plate which has the same structure and size with the bottom rear box wall is arranged in the middle of the bottom box body; a top outer baffle and a top inner baffle are respectively connected between the rear end of the top plate, the rear end of the upper partition plate and the top rear box wall, the middle part of the top plate, the middle part of the upper partition plate and the top supporting plate in the top box body; an upper outer baffle and an upper inner baffle are respectively connected between the rear end of the upper partition plate, the rear end of the middle partition plate and the upper rear box wall, and between the middle part of the upper partition plate, the middle part of the middle partition plate and the upper support plate in the upper box body; a lower outer baffle and a lower inner baffle are respectively connected between the rear end of the middle clapboard, the rear end of the lower clapboard and the lower rear box wall, and between the middle part of the middle clapboard, the middle part of the lower clapboard and the lower support plate in the lower box body; and a bottom outer baffle and a bottom inner baffle are connected between the rear end of the lower baffle, the rear end of the bottom plate and the bottom rear box wall in the bottom box body, and between the middle part of the lower baffle, the middle part of the bottom plate and the bottom support plate.
The temporary device for maintaining mechanical balance under the bridge construction process of arching before beam, wherein each bundle of steel stranded wires consists of a plurality of galvanized steel stranded wires; the anchorage device comprises an anchor plate and a clamping piece; the anchor plate is disc-shaped, and a plurality of conical holes are uniformly distributed on the anchor plate; the clamping pieces are wedge-shaped and are arranged in each conical hole of the anchor plate, and each clamping piece clamps one steel strand.
According to the temporary device for maintaining mechanical balance under the bridge construction process of the arch-first and the beam-second, the top surfaces of the two embedded plates and the bottom surfaces of the two pier top base plates are jointed by grouting.
The utility model discloses a maintain mechanical balance's interim device's technical scheme has following characteristics under the arched bridge construction technology of earlier encircleing back roof beam:
1. the temporary tie bars are respectively arranged between the pair of arch feet of the two arch ribs, so that when the sections of the arch ribs and the sections of the main beam are asymmetrically hoisted, the longitudinal bridge horizontal thrust generated by buckling cables on the arch feet at the two ends can be counteracted by oppositely pulling the temporary tie bars, and the longitudinal bridge horizontal thrust is converted into the structural internal force;
2. the temporary support is arranged between the two main piers and the arch springing of the two arch ribs, so that unbalanced longitudinal bridge horizontal thrust generated by the buckling ropes to the single-side arch springing is transmitted to the main piers to bear when the sections of the arch ribs and the sections of the main beam are asymmetrically hoisted, and a protection effect is achieved on the permanent support.
The temporary device of the utility model has simple structure and low manufacturing cost, the strength and rigidity of the tie bar anchor box and the temporary support can meet the safety requirement, and the temporary device is convenient to install and remove; the construction process can be simplified, the operation convenience and the safety are improved, the safety and the line shape controllability of the arch rib structure in the whole construction process are ensured, and the disassembly is convenient.
Drawings
Fig. 1 is an elevation view of a bridge to which the temporary device of the present invention relates;
fig. 2 is a plan view of a bridge to which the temporary device of the present invention relates;
fig. 3 is a construction state diagram of a bridge to which the temporary device of the present invention relates;
fig. 4 is a schematic structural diagram of a temporary device for maintaining mechanical balance in an arch bridge construction process of arch-first and beam-second of the present invention;
FIG. 5 is an enlarged view of the portion P in FIG. 4;
FIG. 6 is a view taken along line A-A of FIG. 5;
FIG. 7 is a view from the direction B in FIG. 6;
FIG. 7a is a view from the direction C-C in FIG. 7;
FIG. 7b is a view from direction D-D in FIG. 7;
FIG. 7c is a view from E-E in FIG. 7;
FIG. 7d is a view from direction F-F of FIG. 7;
fig. 8 is a schematic structural view of a temporary support in a temporary device for maintaining mechanical balance in an arch bridge construction process of arch-first and girder-second of the present invention;
FIG. 8a is a view from the direction G-G in FIG. 8;
FIG. 8b is a view from direction H-H of FIG. 8;
fig. 8c is a view from direction I-I in fig. 8.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1 and 2, the temporary device for maintaining mechanical balance in the construction process of a bridge with an arch first and a girder second of the present invention is a simply supported steel box arch bridge and includes a south bridge approach 200, a north bridge approach 300 and a main bridge 100. The main bridge 100 comprises arch ribs 1, a suspender 3, a main beam 4 and an orthogonal special-shaped bridge deck 5; the arch rib 1 has two paths of up and down stream, the middle is connected by 7 permanent cross braces 2; the single-channel arch rib comprises a pair of arch feet positioned at two ends of the single-channel arch rib; the main beam 4 is located between the main piers 40 of the two portal frame structures and comprises longitudinal beams and cross beams, the cross beams comprise two end cross beams and a plurality of general cross beams, the two end cross beams are arranged between the arch springing 10 at the two ends of the two arch ribs in a one-to-one correspondence mode, and the general cross beams are arranged at intervals along the longitudinal direction of the bridge deck.
Referring to fig. 4 to 8c, the temporary device for maintaining mechanical balance in the bridge construction process of the arch-first and the back-beam of the present invention includes two temporary tie bars 6 and four temporary supports 7.
Each temporary tie bar 6 is arranged between a pair of arch feet 10 of the single arch rib; each temporary tie bar 6 comprises two tie bar anchor boxes 60, two groups of anchors and four steel strands 66; two tie rod anchor boxes 60 are welded one-to-one and symmetrically on the outer side of a pair of arch springing 10.
Each tie rod anchor box 60 comprises a top plate 601, a bottom plate 605, an upper partition 602, a middle partition 603 and a lower partition 604 vertically welded on the outer side of the arch springing 10; each tie rod anchor box 60 is divided into a top box body 61, an upper box body 62, a lower box body 63 and a bottom box body 64 by an upper partition plate 602, a middle partition plate 603 and a lower partition plate 604; wherein,
the top plate 601, the bottom plate 605, the upper partition 602, the middle partition 603 and the lower partition 604 are the same in length; the widths of the top plate 601, the upper partition plate 602 and the middle partition plate 603 are also the same; the width of the lower partition 604 is smaller than that of the middle partition 603; the width of the bottom plate 605 is smaller than the width of the lower partition 604;
the top rear box wall 611 and the top front box wall 613 of the top box body 61 and the upper rear box wall 621 and the upper front box wall 623 of the upper box body 62 are identical in structure and size; the lower rear box wall 631 and the lower front box wall 633 of the lower box body 63 have the same structure and size; the bottom rear wall 641 and the bottom front wall 643 of the bottom case 64 are identical in structure and size
The top rear box wall 611 and the top front box wall 613 of the top box body 61, the upper rear box wall 621 and the upper front box wall 623 of the upper box body 62, the lower rear box wall 631 and the lower front box wall 633 of the lower box body 63, and the bottom rear box wall 641 and the bottom front box wall 643 of the bottom box body 64 are respectively provided with a steel strand perforation 610, 620, 630 and 640; the distance from the steel strand bundle through hole 610 on the top box body 61 to the outer side surface of the arch springing 10 is the same as the distance from the steel strand bundle through hole 620 on the upper box body 62 to the outer side surface of the arch springing 10; the distance from the steel strand bundle through hole 630 on the lower box body 63 to the outer side surface of the arch springing 10 is smaller than the distance from the steel strand bundle through hole 620 on the upper box body 62 to the outer side surface of the arch springing 10; the distance from the steel strand bundle through hole 640 on the bottom box body 64 to the outer side surface of the arch springing 10 is smaller than the distance from the steel strand bundle through hole 630 on the lower box body 63 to the outer side surface of the arch springing 10;
a top supporting plate 612 with the same structure and size as the top rear box wall 611 is arranged in the middle of the top box body 61; an upper supporting plate 622 with the same structure and size as the upper rear box wall 621 is arranged in the middle of the upper box body 62; the middle part in the lower box body 63 is provided with a lower support plate 632 with the same structure and size as the lower rear box wall 631; a bottom supporting plate 642 with the same structure and size as the bottom rear box wall 641 is arranged in the middle of the bottom box body 64;
a top outer baffle 614 and a top inner baffle 615 are respectively connected between the rear end of the top plate 601, the rear end of the upper clapboard 602 and the top rear box wall 611, and between the middle part of the top plate 601, the middle part of the upper clapboard 602 and the top supporting plate 612 in the top box body 61; an upper outer baffle 624 and an upper inner baffle 625 are respectively connected between the rear end of the upper clapboard 602, the rear end of the middle clapboard 603 and the upper rear box wall 621, and between the middle part of the upper clapboard 602, the middle part of the middle clapboard 603 and the upper support plate 622 in the upper box body 62; a lower outer baffle 634 and a lower inner baffle 635 are respectively connected between the rear end of the middle partition 603, the rear end of the lower partition 604 and the lower rear box wall 631, and between the middle of the middle partition 603 and the middle of the lower partition 604 and the lower support plate 632 in the lower box body 63; a bottom outer baffle 644 and a bottom inner baffle 645 are connected between the rear end of the lower clapboard 604, the rear end of the bottom plate 605 and the bottom rear box wall 641, the middle part of the lower clapboard 604 and the middle part of the bottom plate 605 and the bottom support plate 642 in the bottom box body 64; the top outer baffle 614, the top inner baffle 615, the upper outer baffle 624, the upper inner baffle 625, the lower outer baffle 634, the lower inner baffle 635, the bottom outer baffle 644, and the bottom inner baffle 645 are all identical in construction and size.
The two groups of anchorage devices are composed of four anchorage devices 65, the four anchorage devices 65 in each group of anchorage devices are correspondingly arranged on the top rear box wall 611, the upper rear box wall 621, the lower rear box wall 631 and the bottom rear box wall 641 of each tie rod anchor box 60 and are correspondingly arranged with the steel strand perforation holes 610, 620, 630 and 640 on the top box body 61, the upper box body 62, the lower box body 63 and the bottom box body 64; each anchor comprises an anchor plate 651 and 43 clips 652; the anchor plate 651 is disc-shaped, and 43 conical holes are uniformly distributed on the anchor plate 651; the clamping pieces 652 are wedge-shaped, and 43 clamping pieces 652 are arranged in 43 tapered holes on the anchor plate 651 in a one-to-one correspondence, and each clamping piece 652 clamps one steel strand.
Four bundles of steel strands 66 are connected between the two groups of anchors 65 in a one-to-one correspondence manner, and the four bundles of steel strands 66 are arranged in the top box body 61, the upper box body 62, the lower box body 63 and the bottom box body 64 of the two tie rod anchor boxes 60 in a one-to-one correspondence manner, and the four bundles of steel strands 66 are basically positioned on the same vertical surface (see fig. 6); each strand 66 is made up of 43 wires of os 15.2 galvanized steel.
When the jack is used for tensioning the steel strand and reaches a designed stress value, the jack is slowly released, the clamping piece of the anchorage device is brought into the conical hole of the anchor plate by the steel strand which retracts at a constant speed to form an anchoring unit, and the stress of the steel strand bundle is transmitted to the building structure through the anchor plate and the anchor backing plate to form permanent prestress.
Four temporary supports 7 are provided between the bottom surfaces of a pair of fillets 10 of the two ribs and the top surfaces of the two main piers 40 in one-to-one correspondence. Each temporary support 7 comprises a pier top section and a beam bottom section; wherein,
the pier top section comprises two embedded plates 70, two pier top bottom plates 71, two pier top panels 72, two pier top partition plates 73 and four I-shaped steel sections 75; two embedded plates 70 are embedded at the top of the main pier 40 at intervals, and each embedded plate 70 is provided with a group of finish-rolled deformed steel bars 700 with the lower parts embedded in the main pier 40; the two pier top base plates 71 are respectively arranged on the two embedded plates 70 in a one-to-one correspondence mode through a group of finish-rolled deformed steel bars 700 and nuts 700'; the top surfaces of the two embedded plates 70 are attached to the bottom surfaces of the two pier top bottom plates 71 through grouting, so that the connection strength between the pier top bottom plates 71 and the embedded plates 70 is enhanced; the two pier top panels 72 are fixed at the inner ends of the two pier top bottom plates 71 in a one-to-one correspondence manner; the two pier top partition plates 73 are fixed at the outer ends of the two pier top bottom plates 71 in one-to-one correspondence; four pier top webs 74 are respectively arranged between the outer surfaces of the two pier top panels 72 and the inner surfaces of the two pier top partition plates 73 in parallel, and concrete is poured into a cavity formed by the adjacent pier top webs 74, the pier top panels 72 and the pier top partition plates 73 so as to enhance the strength of the temporary support 7; four i-shaped steels 75 are welded in parallel between the inner surfaces of the lower parts of the two pier top panels 72;
the beam bottom section comprises two beam bottom panels 76, four beam bottom webs 78, a beam bottom backing plate 79 and two groups of beam bottom stiffening plates 791 and 792; the outer surfaces of the two beam bottom panels 76 are welded to the upper inner surfaces of the two pier top panels 72 one-to-one by a gap spacer 77; four beam bottom webs 78 are welded in parallel between the inner surfaces of the two beam bottom panels 76; the beam bottom backing plate 79 is welded between the top surfaces of the two beam bottom panels 76 and the top surfaces of the four beam bottom web plates 78 and the bottom surface of the arch springing 10; the two groups of beam bottom stiffening plates 791 and 792 are welded between the outer surfaces of the two beam bottom panels 76 and the bottom surfaces of the arch springing 10 in a one-to-one correspondence manner; the two groups of beam bottom stiffening plates 791 and 792 are respectively composed of four stiffening plates, so that the temporary support 7, the main pier 40 and the arch springing 10 are connected into a whole.
The utility model discloses a maintain mechanical balance's interim device under bridge construction process of encircleing back beam earlier, adopt the process of encircleing the back beam earlier at the main bridge (see chinese patent CN108532465) when being under construction, along with the construction impels, before the girder closure, it is the biggest to the continuous stack of horizontal force to the longitudinal bridge, in order to fall to minimumly to the atress adverse effect of major structure, need carry out each stage of overhang district arch rib and girder construction flow and stretch-draw interim tie rod 6, through to drawing interim tie rod 6 to offset by detaining the cable longitudinal bridge to horizontal thrust that both ends hunch foot 10 produced, and convert the structure internal force.
Bridge professional software M I DAS/C IVI L is adopted to establish a finite element model of the main bridge, the main bridge structure is analyzed to calculate the tension of the temporary tie bar 6, and then a monitoring unit carries out monitoring and correction after comparing with the finite element model according to the actual situation of site construction. In order to reduce the influence of the horizontal thrust in the longitudinal direction on the main pier 40 in the construction process, the temporary tie bars 6 are correspondingly tensioned one segment at a time.
Each time one arch rib segment and one main beam segment are hoisted, a tension force monitoring instruction of the temporary tie bar 6 is provided, and a construction unit performs on-site tension on the temporary tie bar 6 according to the requirement of the monitoring instruction; the tensioning is carried out by adopting the principle that the upstream and downstream sides and the north and south sides are synchronously symmetrical, the four steel strands 66 of the single temporary tie bar 6 are from top to bottom, the tensioning is carried out in batches and in stages during tensioning, and the tensioning is carried out by four 250t jacks of the north and south sides and the upstream and downstream sides synchronously. Because each bundle of steel strands has 43, the steel strands are labeled before tensioning, the wrong tensioning is prevented, and each bundle of steel strands is tensioned according to batch symmetry.
The temporary tie bar 6 guarantees the structure safety in the construction stage, and is stressed greatly and has long working time, so that the safety of the temporary tie bar 6 in the whole construction process is guaranteed. The utility model discloses a tie bar 6's standard tensile strength is 1860Mpa, and tie bar's anchor point's horizontal distance is 229.4m temporarily, and every tie bar 6's the biggest tensile force is 1452.7t temporarily.
According to the calculation of a finite element model, when the temporary tie bars 6 are symmetrically tensioned on two banks, the maximum value of unbalanced longitudinal horizontal thrust required to be resisted by the single-side arch foot 10 is 166kN, the single-side tensioning temporary tie bars are required to be tensioned after single-channel arch rib hoisting in consideration of the hoisting asymmetry, if the maximum buckling cable force 1156kN is completely converted into the longitudinal horizontal force, the tensioning force of the single-channel temporary tie bars 6 is 1156/2-578 kN, the unbalanced horizontal thrust caused by the single-side tensioning is borne by the arch foot 10 is 578kN, and therefore the maximum value of the calculated load of the temporary support 7 is 578+ 166-744 kN.
If the longitudinal horizontal thrust generated when hoisting the No. 17-18 segment arch ribs on the south bank side is 50 tons, and the longitudinal horizontal thrust of 45 tons is generated when hoisting the 11-12 segment arch ribs on the north bank side (the No. 17-18 segment arch ribs on the south bank side and the 11-12 segment arch ribs on the north bank side are hoisted at the same stage), the longitudinal horizontal thrust of the south bank is balanced when the tension of the temporary tie bar 6 is 50 tons according to the monitoring instruction, and the unbalanced longitudinal horizontal thrust of 5 tons is also generated on the north bank, and the unbalanced longitudinal horizontal thrust of 5 tons is borne by the temporary support 7 and is transmitted to the main pier 40 through the temporary support 7.
After the main beams are closed, the temporary tie bars 6 and the temporary supports 7 are removed after the conversion of the stress system is completed, and the longitudinal horizontal thrust on the arch springing 10 is borne by the longitudinal beams.
The temporary device of the utility model has simple structure and low manufacturing cost, the strength and rigidity of the tie bar anchor box and the temporary support can meet the safety requirement, and the temporary device is convenient to install and remove; the construction process can be simplified, the operation convenience and the safety are improved, the safety and the line shape controllability of the arch rib structure in the whole construction process are ensured, and the disassembly is convenient.
The above embodiments are provided only for the purpose of illustration, not for the limitation of the present invention, and those skilled in the relevant art can make various changes or modifications without departing from the spirit and scope of the present invention, therefore, all equivalent technical solutions should also belong to the scope of the present invention, and should be defined by the claims.
Claims (4)
1. A temporary device for maintaining mechanical balance under a bridge construction process of arch first and girder second, wherein the bridge is a simply supported steel box arch bridge and comprises arch ribs, a hanging rod, a main girder and an orthogonal special-shaped bridge deck; the arch rib has two paths of up and down streams, the single-path arch rib comprises a pair of arch feet positioned at two ends of the single-path arch rib; the main beam is positioned between main piers of the two portal frame structures and comprises longitudinal beams and cross beams, the cross beams comprise two end cross beams and a plurality of general cross beams, the two end cross beams are correspondingly arranged between arch legs at two ends of two arch ribs one by one, and the general cross beams are longitudinally arranged along the bridge deck at intervals; the temporary device comprises two temporary tie bars and four temporary supports; each temporary tie bar is arranged between a pair of arch feet of the single arch rib; the four temporary supports are correspondingly arranged between the bottom surfaces of a pair of arch feet of the two arch ribs and the top surfaces of the two main bridge piers one by one, and are characterized in that,
each temporary tie bar comprises two tie bar anchor boxes, two groups of anchors and four steel strands;
the two tie rod anchor boxes are welded on the outer side surfaces of the pair of arch feet in a one-to-one correspondence and symmetrical mode; each tie rod anchor box comprises a top plate and a bottom plate and is divided into a top box body, an upper box body, a lower box body and a bottom box body by an upper partition plate, a middle partition plate and a lower partition plate; the top rear box wall and the top front box wall of the top box body, the upper rear box wall and the upper front box wall of the upper box body, the lower rear box wall and the lower front box wall of the lower box body and the bottom rear box wall and the bottom front box wall of the bottom box body are respectively provided with a steel strand through hole; the distance from the steel strand bundle perforation on the top box body to the outer side face of the arch springing is the same as the distance from the steel strand bundle perforation on the upper box body to the outer side face of the arch springing; the distance from the steel strand bundle perforation on the lower box body to the outer side face of the arch springing is smaller than the distance from the steel strand bundle perforation on the upper box body to the outer side face of the arch springing; the distance from the steel strand bundle perforation on the bottom box body to the outer side face of the arch springing is smaller than the distance from the steel strand bundle perforation on the lower box body to the outer side face of the arch springing;
each group of anchorage devices are correspondingly arranged on the top rear box wall, the upper rear box wall, the lower rear box wall and the bottom rear box wall of each tie rod anchor box and correspond to the steel strand perforations on the top box body, the upper box body, the lower box body and the bottom box body one by one;
the four bundles of steel strands are connected between the two groups of anchorage devices in a one-to-one correspondence manner;
each temporary support comprises a pier top section and a beam bottom section;
the pier top section comprises two pre-embedded plates, two pier top bottom plates, two pier top panels, two pier top partition plates and four I-shaped steel; two pre-embedded plates are pre-embedded at the top of the main pier at intervals, and each pre-embedded plate is provided with a group of finish-rolled deformed steel bars with the lower parts pre-embedded in the main pier; the two pier top base plates are respectively arranged on the two embedded plates in a one-to-one correspondence manner through a group of finish rolling deformed steel bars and nuts; the two pier top panels are fixed at the inner ends of the two pier top bottom plates in a one-to-one correspondence manner; the two pier top partition plates are fixed at the outer ends of the two pier top bottom plates in a one-to-one correspondence manner; a plurality of pier top webs are respectively arranged between the outer surfaces of the two pier top panels and the inner surfaces of the two pier top partition plates in parallel, and concrete is poured into a cavity formed by the adjacent pier top webs, the pier top panels and the pier top partition plates; four I-shaped steel sections are welded between the inner surfaces of the lower parts of the two pier top panels in parallel;
the beam bottom section comprises two beam bottom panels, a plurality of beam bottom webs, a beam bottom base plate and two groups of beam bottom stiffening plates; the outer surfaces of the two beam bottom panels are respectively welded with the inner surfaces of the upper parts of the two pier top panels in a one-to-one correspondence way through a gap clapboard; a plurality of beam bottom webs are welded between the inner surfaces of the two beam bottom panels in parallel; the beam bottom backing plate is welded between the top surfaces of the two beam bottom panels and the bottom surfaces of the arch springing; the two groups of beam bottom stiffening plates are welded between the outer surfaces of the two beam bottom panels and the bottom surfaces of the arch springing in a one-to-one correspondence manner.
2. The temporary device for maintaining mechanical balance under the bridge construction process of the arch-first and the beam-second according to claim 1, wherein a top supporting plate having the same structure and size as those of the top-rear box wall is arranged at the middle part in the top box body; an upper supporting plate which has the same structure and size with the upper rear box wall is arranged in the middle of the upper box body; the middle part in the lower box body is provided with a lower supporting plate which has the same structure and size with the lower rear box wall; a bottom supporting plate which has the same structure and size with the bottom rear box wall is arranged in the middle of the bottom box body; a top outer baffle and a top inner baffle are respectively connected between the rear end of the top plate, the rear end of the upper partition plate and the top rear box wall, the middle part of the top plate, the middle part of the upper partition plate and the top supporting plate in the top box body; an upper outer baffle and an upper inner baffle are respectively connected between the rear end of the upper partition plate, the rear end of the middle partition plate and the upper rear box wall, and between the middle part of the upper partition plate, the middle part of the middle partition plate and the upper support plate in the upper box body; a lower outer baffle and a lower inner baffle are respectively connected between the rear end of the middle clapboard, the rear end of the lower clapboard and the lower rear box wall, and between the middle part of the middle clapboard, the middle part of the lower clapboard and the lower support plate in the lower box body; and a bottom outer baffle and a bottom inner baffle are connected between the rear end of the lower baffle, the rear end of the bottom plate and the bottom rear box wall in the bottom box body, and between the middle part of the lower baffle, the middle part of the bottom plate and the bottom support plate.
3. The temporary device for maintaining mechanical balance under a bridge construction process of arch-first and beam-second according to claim 1, wherein each bundle of steel strands is composed of a plurality of galvanized steel strands; the anchorage device comprises an anchor plate and a clamping piece; the anchor plate is disc-shaped, and a plurality of conical holes are uniformly distributed on the anchor plate; the clamping pieces are wedge-shaped and are arranged in each conical hole of the anchor plate, and each clamping piece clamps one steel strand.
4. The temporary device for maintaining mechanical balance under the bridge construction process of the arch-first and the beam-second according to claim 1, wherein the top surfaces of the two embedded plates and the bottom surfaces of the two pier top base plates are jointed by grouting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921307320.6U CN210507162U (en) | 2019-08-13 | 2019-08-13 | Temporary device for maintaining mechanical balance under bridge construction process of arch-first and beam-second |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921307320.6U CN210507162U (en) | 2019-08-13 | 2019-08-13 | Temporary device for maintaining mechanical balance under bridge construction process of arch-first and beam-second |
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| CN210507162U true CN210507162U (en) | 2020-05-12 |
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| CN201921307320.6U Withdrawn - After Issue CN210507162U (en) | 2019-08-13 | 2019-08-13 | Temporary device for maintaining mechanical balance under bridge construction process of arch-first and beam-second |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295548A (en) * | 2019-08-13 | 2019-10-01 | 中交第三航务工程局有限公司 | The makeshift device of mechanical balance is maintained under the bridge construction technique of fitting the arch first then fitting the girder |
-
2019
- 2019-08-13 CN CN201921307320.6U patent/CN210507162U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295548A (en) * | 2019-08-13 | 2019-10-01 | 中交第三航务工程局有限公司 | The makeshift device of mechanical balance is maintained under the bridge construction technique of fitting the arch first then fitting the girder |
| CN110295548B (en) * | 2019-08-13 | 2024-02-20 | 中交第三航务工程局有限公司 | Temporary device for maintaining mechanical balance in bridge construction process of arch-before-beam |
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