CN110904854A - Arch bridge construction method adapting to removal progress - Google Patents
Arch bridge construction method adapting to removal progress Download PDFInfo
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- CN110904854A CN110904854A CN201911358346.8A CN201911358346A CN110904854A CN 110904854 A CN110904854 A CN 110904854A CN 201911358346 A CN201911358346 A CN 201911358346A CN 110904854 A CN110904854 A CN 110904854A
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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
Abstract
The invention relates to the field of bridge construction, in particular to an arch bridge construction method suitable for a removal progress, which comprises the following steps: pouring a main pier arch base, and installing a first section of main arch rib on the main pier arch base; erecting a mid-span bridge deck system assembling support, and subsequently performing a mid-span construction procedure; pouring a pier stud at the side of the first side span, and subsequently performing a first side span construction procedure; after the main arch rib is installed to close the closure by using a temporary tie bar pulled on the main pier arch seat, pouring a pier stud at a second side span side by using a template detached from the pier stud at the first side span side, and subsequently performing a second side span construction procedure; respectively completing mid-span and first side-span closure and mid-span and second side-span closure; sequentially installing a suspender and a tie bar; and (5) dismantling all temporary facilities to complete the construction of the arch bridge. The invention reduces the using amount of the templates and ensures the construction progress to be carried out as required.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of bridge construction, in particular to an arch bridge construction method suitable for a removal progress.
[ background of the invention ]
With the high-speed development of modern economy, the development of high-speed railways and highways also enters a rapid development stage, large-span bridges are more and more, arch bridges have the advantages of large crossing capacity, simple structure, definite stress, various forms, attractive appearance and the like, and are more and more widely applied to the high-speed railways and the highways, and particularly are favored when crossing rivers in urban and suburban areas.
In a concrete arch bridge, a pier column is an important supporting component of the arch bridge, and the existing construction method of the pier column generally utilizes a plurality of sets of templates to respectively construct each pier column of the arch bridge, so that when the quantity of the templates is insufficient due to poor construction conditions, the timely completion of the arch bridge cannot be guaranteed.
[ summary of the invention ]
The invention aims to provide an arch bridge construction method suitable for the removal progress, so that the using number of templates is reduced, and the construction progress is ensured to be carried out as required.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides an arch bridge construction method suitable for a removal progress, which comprises the following steps:
pouring a main pier arch base, and mounting a first section of main arch rib on the main pier arch base;
erecting a mid-span bridge deck system assembling support, and subsequently performing a mid-span construction procedure; pouring a pier stud at the side of the first side span, and subsequently performing a first side span construction procedure;
after the main arch rib is installed to close the closure by using a temporary tie bar pulled on the main pier arch seat, pouring a pier stud at a second side span side by using a template detached from the pier stud at the first side span side, and subsequently performing a second side span construction procedure;
respectively completing mid-span and first side-span closure and mid-span and second side-span closure;
sequentially installing a suspender and a tie bar;
and (5) dismantling all temporary facilities to complete the construction of the arch bridge.
In one embodiment, the step of erecting a mid-span bridge deck assembly support comprises:
carrying out static load test on the projected foundation of the mid-span bridge deck system splicing support;
and after the static load test meets the construction requirements, erecting a mid-span bridge deck system assembling support on the foundation.
In one embodiment, the step of performing a mid-span construction sequence comprises:
and sequentially hoisting steel longitudinal beams on the mid-span bridge deck system assembling support along the mid-span central line towards the direction of the main pier arch center, and performing welding and high-strength bolt reinforcing treatment.
In one embodiment, the step of sequentially hoisting the steel longitudinal beams along the midspan central line to the direction of the main pier arch center on the midspan bridge deck system assembling support comprises the following steps:
after two steel cross beams and steel longitudinal beams are connected into a whole, hoisting and installing the whole from one side of the mid-span bridge deck system assembling support;
and hoisting and installing the other steel longitudinal beams from the two sides of the mid-span bridge deck system assembling support along the mid-span central line to the direction of the main pier arch seat.
In an embodiment, the arch bridge construction method adapted to the removal progress further includes:
installing a bridge deck on the steel longitudinal beam, and pouring a wet joint;
and erecting a main arch rib bracket on the bridge deck for splicing the main arch ribs of the rest sections.
In one embodiment, the step of installing the main rib to the closure using temporary tie rods pulled over the main pier abutments comprises:
during solidification of the pier stud on the first side span side, positioning and installing the second section of main arch rib and the rest section of main arch rib by using a temporary tie rod pulled on the main pier arch base, and completing closure; and the second section of main arch rib is respectively fixed with the first section of main arch rib and the steel longitudinal and transverse beams in a contraposition mode.
In one embodiment, after the main arch rib is installed to the closure by using the temporary tie bar pulled on the main pier arch, the method further comprises the following steps:
and coating anti-corrosion coating on the surface of the main arch rib, and dismantling the main arch rib bracket.
In one embodiment, the step of performing the first side span construction process subsequently comprises:
erecting an edge arch rib bracket between the pier stud on the first side span side and the main pier arch seat adjacent to the pier stud;
and constructing side arch ribs based on the side arch rib supports, and installing steel longitudinal beams and bridge decks opposite to the middle span on the side arch ribs.
In an embodiment, after the mid-span and the first side-span are respectively closed and the mid-span and the second side-span are closed, the method further includes:
and adjusting the line shape of the bridge deck system until the preset line shape is met, and dismantling the mid-span bridge deck system assembling support.
In one embodiment, after the removing the mid-span bridge deck system assembling support, the method further comprises:
and tensioning the tie bars to enable the prestress data of the tie bars to meet the prestress requirement.
Compared with the prior art, the invention has the following advantages:
1. the arch bridge construction method adapting to the removal progress, provided by the invention, has the advantages that during the solidification of the pier stud at the first side span, the main arch rib is installed to close by utilizing the temporary tie rod pulled on the main pier arch seat, after the pier stud at the first side span is solidified, the pier stud at the second side span is poured by utilizing the template removed from the pier stud at the first side span, and the second side span construction procedure is subsequently carried out, so that the using number of the template is reduced, and the construction progress is ensured to be carried out as required.
2. Performing static load test on the projected foundation of the mid-span bridge deck system splicing support; after the static load test meets the construction requirements, erecting a mid-span bridge deck system assembling support on the foundation to ensure the safety and stability of the erected mid-span bridge deck system assembling support.
3. Through on the support is assembled to midspan bridge floor system along midspan central line the direction of main pier hunch seat hoists steel longitudinal and transverse beams in proper order to accomplish the hoist and mount of steel longitudinal and transverse beams rationally, in an orderly manner, and carry out welding and the reinforcement of high strength bolt and handle, in order to improve the steadiness of steel longitudinal and transverse beams.
4. The arch bridge construction method adapting to the removal progress, provided by the invention, is characterized in that the bridge deck is installed on the steel longitudinal beam, and the wet joint pouring is carried out; and erecting a main arch rib bracket on the bridge deck for assembling the main arch ribs of the rest sections so as to ensure that the main arch ribs can be safely and stably assembled according to a preset line shape.
5. The arch bridge construction method adapting to the removal progress, provided by the invention, is characterized in that the main arch rib bracket is utilized to position and install the second section of main arch rib and the rest section of main arch rib, and closure is completed; when the main arch rib bearing device is installed, the second section of main arch rib is respectively fixed with the first section of main arch rib and the steel longitudinal and transverse beams in an alignment mode, so that the main arch rib is stably connected with the main beam, and the load of the main beam is borne through the main arch rib.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
[ description of the drawings ]
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow chart of an embodiment of an arch bridge construction method adapting to the removal progress of the invention;
FIG. 2 is a construction diagram of an embodiment of the arch bridge construction method adapting to the removal progress of the invention;
FIG. 3 is a schematic illustration of the construction of the next stage of FIG. 2;
FIG. 4 is a schematic illustration of the construction of the next stage of FIG. 3;
fig. 5 is a construction schematic diagram of another embodiment of the arch bridge construction method adapting to the removal progress of the invention.
[ detailed description ] embodiments
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
As shown in figure 1 and combined with figures 2-4, the invention provides an arch bridge construction method, which aims to solve the problems that the existing reinforced concrete arch rib cast-in-place is high in requirements on the delayed coagulation time and the pouring speed of concrete, the closure of the arch rib must be finished before the initial setting of the cast-in-advance concrete, the control difficulty of the concrete pouring process is high, the transverse stability is poor, the risk is high, and the time consumption is long. In one embodiment, the arch bridge construction method comprises the following steps:
s11, pouring a main pier arch base 1, and installing a first section of main arch rib 3 on the main pier arch base 1;
in the step, four bearing platforms which are opposite in pairs are poured on a foundation projected by an arch bridge, and main pier arch bases 1 are poured on each bearing platform, wherein the four main pier arch bases 1 are enclosed into a rectangular shape and are respectively arranged below a main beam to be poured.
The arched main arch rib is divided into a plurality of sections from the bottom end to the top end of the main arch rib, the section main arch rib directly connected with the main pier arch base 1 is taken as a first section main arch rib 3, and the section main arch rib positioned at the top end of the main arch rib is taken as a last section main arch rib. Since the main rib segment to be installed later is the first segment main rib 3 as the position limiter for installation positioning, the first segment main rib 3 must be installed accurately. According to the method, after the main pier arch base 1 is poured, four first-section main arch ribs 3 are installed on the main pier arch base 1 in the direction of the midspan center line, the lower ends of the first-section main arch ribs 3 are embedded into the main pier arch base 1 for fixing, and the upper ends of the first-section main arch ribs are spliced with the main arch ribs of the rest sections. The main arch rib is a main component of the main arch and is used for supporting the load in the midspan of the main beam.
S12, erecting a midspan bridge deck system assembling support 4, and then performing a midspan 5 construction procedure; pouring the pier stud 2 at the first side span, and subsequently performing a first side span construction process;
in the step, a bridge deck system assembling support 4 can be erected by means of a first section main arch rib 3 for construction of a midspan, a side span on any side is selected to pour a pier stud 2 on the side of a first side span, the first side span is erected between the pier stud 2 and a main pier arch base 1, the bridge deck system assembling supports 4 on two sides of the midspan to be erected are fixed with the first section main arch rib 3, and the bridge deck system assembling support 4 and another adjacent bridge deck system assembling support 4 are connected into a whole through a parallel connection and a cross brace. The height of the bridge deck system assembling support 4 can be designed according to the height of a midspan to be built, and the number of the midspan bridge deck system assembling supports 4 is selected according to the span of the midspan to be built.
Further, the mid-span 5 construction process and the first side-span construction process need to be performed synchronously, and then the closure of the mid-span 5 and the first side-span is completed, so as to ensure that the arch bridge is completed as required. The construction process of the mid-span 5 may include building of a bridge deck system, pouring of wet joints, closure with side spans, setting of guard rails, and the like. The first side span construction process may include laying of side span bridge decks, building of side arch ribs, closure with a mid-span, and the like.
When the mid-span bridge deck system assembling support 4 is erected, the erecting height of the steel pipe upright column is determined according to the design elevation and the pre-camber provided by design and the height of the foundation embedded part obtained by actual measurement, and then the steel pipe upright column is installed in the direction from the middle of the mid-span to the main pier arch bases 1 at two sides by adopting an automobile crane. The steel pipe upright columns are members which play a main supporting role in the mid-span bridge deck system assembling support 4.
Further, in order to guarantee the installation quality of the support 4 assembled on the midspan bridge deck system, the steel tube stand columns and the parallel connection are processed strictly according to drawings in a unified mode, then the steel tube stand columns are lifted and installed, the brackets are welded synchronously according to the drawing requirements during the processing of the steel tube stand columns, the connecting plates with the thickness of 10mm are welded on the outer sides of the steel tube stand columns, and the size of each connecting plate is 300mm multiplied by 150mm multiplied by 10mm and used for fixing the steel tube stand columns and the foundation. When the support 4 is assembled to the midspan bridge deck system, the steel pipe stand corresponds synchronous construction with the tie, the tie is used for linking two adjacent steel pipe stands together to strengthen the stability of the overall structure of the support 4 is assembled to the midspan bridge deck system. Wherein, the installation verticality of the steel tube upright is required to be less than or equal to H/500 and not more than 5 cm.
In addition, the elevation position of the parallel connection is determined according to a drawing before the parallel connection is hoisted, the quality and the thickness of welding seams of the parallel connection and the steel pipe upright post and the parallel connection and the cross braces are strictly controlled in the construction process, and the cross points of the two cross braces are welded into a whole. The flat joint adopts a full-weld joint mode, the thickness of a weld joint is not less than that of a base metal, the surface of the weld joint has no defects of air holes, slag inclusion, arc pits, cracks, incomplete full welding and the like, and the next-stage construction can be carried out after the quality of the weld joint of the steel pipe upright post is checked to be qualified by an on-site quality inspector.
S13, after the side arch rib support 6 is erected on the first side span side, pouring the pier stud 2 on the second side span side, and then performing a second side span construction procedure;
in the step, an edge arch rib support 6 is built below the first edge span, an edge arch rib 7 is poured by using the edge arch rib support 6, after the edge arch rib support 6 is built, a pier stud 2 on the side of the second edge span is poured, and a second edge span construction process is subsequently carried out. Wherein the edge ribs 7 are used for supporting the first edge span. The second side span construction process may include laying of side span bridge decks, building of side arch ribs, closure with a mid-span, and the like.
S14, sequentially completing main arch rib 9 closure, midspan 5 and first side span closure, and midspan 5 and second side span closure;
the method comprises the following steps of assembling main arch ribs of all sections sequentially from two bottom ends of the main arch ribs, installing and fixing the bottom of the next main arch rib and the top of the previous main arch rib in a contraposition mode during assembling, repeating the steps until the main arch ribs are installed to the closure section arch ribs at the top ends of the main arch ribs, and completing closure of the two closure section arch ribs. And then completing the closure of the mid-span 5 and the first side span and the closure of the mid-span 5 and the second side span, hoisting a decorative plate of a round sky and a square earth, after the full-bridge hoisting is finished, accurately adjusting the elevation of each section of the main arch rib 9, welding the circular seams between the sections, and dismantling the support of the main arch rib 9.
S15, sequentially mounting a suspender and a tie bar;
in the step, after the main arch rib 9 is built, a suspender is arranged between the main arch rib 9 and the midspan to be used as a force transmission component to transmit partial load of the main beam to the main arch rib 9 for bearing. The invention can design 11 groups of 22 suspenders in a full bridge, the distance between two adjacent suspenders is set to be 6.2m, the suspenders adopt steel strand whole bundle extrusion ropes, a rope body is formed by bundling and wrapping a high-strength polyester belt by a single anticorrosion epoxy spraying steel strand through torsion angles, the tensile strength is more than or equal to 1860Mpa, the diameter is 15.2mm, the elastic modulus Ep is 1.9 multiplied by 105MPa, grease or wax is injected between the single steel strands, a polyethylene layer is extruded outside the whole steel strand, and the outer layer of the whole suspender is provided with a protective sleeve.
Wherein, the upper end of the suspender can adopt a fixed-end anchorage device, a spherical support and a backing plate of an upper anchorage head are anchored on the main arch rib 9, and the length of the suspender is adjusted by adjusting the position of a nut; the lower end of the suspender can adopt an anchorage device at the tensioning end, and the lower anchorage head is connected by a pin shaft.
Furthermore, the arch bridge is also provided with a tie bar, two ends of the tie bar are respectively connected with the cushion beams of the rectangular side arch ribs 7 opposite to the longitudinal bridge direction, and the cushion beams of the side arch ribs 7 are poured at the upper ends of the side arch ribs 7 so as to balance the horizontal thrust of the main beam. In addition, a midspan bridge deck system splicing support is flexibly erected by installing a first section of main arch rib on a main pier arch center, and a midspan construction procedure is carried out; and the pier stud at the side of the first side span is poured, and after the side arch rib bracket at the side of the first side span is erected, the pier stud at the side of the second side span is poured, so that the two side spans can be flexibly constructed and matched, and the construction efficiency of the arch bridge is improved.
And S16, removing all temporary facilities to finish the construction of the arch bridge.
In the step, after the construction of each structure of the arch bridge is finished, all temporary facilities such as mounting brackets and the like are dismantled, so that the construction of the arch bridge is finished. The temporary facilities comprise a bridge deck system assembling support, a main arch rib support, an edge arch rib support and other auxiliary facilities.
According to the invention, the arch rib is segmented and assembled, so that the stress generated in the arch rib pouring construction process is reduced to the minimum, the problem of arch rib deformation caused by stress release is avoided, the requirement of arch rib line type is ensured, meanwhile, the construction efficiency is improved by reasonably segmenting the arch rib, and the construction period is saved.
The bridge construction early stage can relate to the removal affairs, if the time limit for a project is tighter, especially when the construction site of boundary department can't start at the scheduled time because of the removal progress lag, can influence the normal clear of construction progress. Therefore, in order to adapt to the removal progress of the side span side, the invention further provides an arch bridge construction method adapting to the removal progress, as shown in fig. 1, namely replacing steps S13 and S14 with steps S23 and S24, respectively, wherein the specific contents of the steps S23 and S24 are as follows:
s23, mounting the main arch rib 9 by using a temporary tie bar pulled on the main pier arch base 1 until closure, pouring the pier stud 2 on the second side span side by using a template detached from the pier stud 2 on the first side span side, and then performing a second side span construction process;
in this step, as shown in fig. 5, when the removal of the pier stud 2 on the first side span side is delayed for a long time, the main arch rib 9 of the remaining segment is installed based on the temporary tie bar 10 by pulling the temporary tie bar 10 on the main pier abutment 1 until closure. When the turnover possibility of the formwork is considered, after the pier stud 2 on the first side span side is solidified, the formwork of the pier stud 2 on the first side span side is removed, and the pier stud 2 on the second side span side is poured by using the formwork.
S24, respectively completing mid-span 5 and first side-span closure and mid-span 5 and second side-span closure;
after the pier stud 2 on the first side span side and the pier stud 2 on the second side span side are poured, the first side span side, the second side span side steel longitudinal beam and the bridge deck are installed, the closure of the midspan 5, the first side span steel longitudinal beam and the bridge deck is completed, and the closure of the midspan 5, the second side span steel longitudinal beam and the bridge deck is completed.
In the invention, during the solidification of the pier stud at the first side span, the temporary tie bar 10 pulled on the main pier arch seat is used for installing the main arch rib to close, after the pier stud at the first side span is solidified, the pier stud at the second side span is poured by using the template detached from the pier stud at the first side span, and then the second side span construction procedure is carried out, so that the using amount of the template is reduced, and the construction progress is ensured to be carried out as required.
In an embodiment, in step S23, the step of mounting the main arch rib 9 to the closure by using the temporary tie bar 10 pulled on the main pier abutment 1 may specifically include:
during the solidification of the pier stud 2 on the first side span side, positioning and installing a second section of main arch rib and the rest section of main arch rib by using a temporary tie rod 10 pulled on the main pier arch base 1, and completing closure; and the second section main arch rib is respectively fixed with the first section main arch rib 3 and the steel longitudinal and transverse beams in a contraposition mode.
In the embodiment, during the solidification of the pier stud 2 on the first side span side, a temporary tie bar 10 is pulled on the main pier arch base 1, the temporary tie bar 10 is used for positioning and installing the second section main arch rib and the rest section main arch ribs, the closing of the main arch ribs 9 is completed, the arch rib supports are removed, the height of the bridge deck system is adjusted by using a jack or a sand cylinder, then the steel longitudinal beams and the bridge deck slab of the middle span 5 and the side span closing section are installed, and the concrete wet joint is poured to be connected into a whole.
And arranging a steel corbel on the second section main arch rib as a supporting point of the adjacent steel cross beam. When the second section main arch rib is hoisted, the second section main arch rib is hoisted to the mid-span bridge deck system assembling support 4 by adopting the crawler crane, and the hoisting process needs to be slowly adjusted, so that the second section main arch rib is prevented from greatly shaking and colliding with other structures. When the second-segment main arch rib is assembled, the butt joint of the second-segment main arch rib and the top opening of the first-segment main arch rib 3 is adjusted to ensure that the second-segment main arch rib is installed in place.
In an embodiment, in step S12, the step of setting up the mid-span bridge deck assembling bracket 4 and then performing the mid-span construction process may specifically include:
carrying out static load test on the foundation projected by the mid-span bridge deck system assembling support 4;
after the static load test meets the construction requirements, erecting a mid-span bridge deck system splicing support 4 on the foundation;
and sequentially hoisting steel longitudinal beams on the mid-span bridge deck system assembling support 4 along the mid-span central line towards the direction of the main pier arch center 1, and performing welding and high-strength bolt reinforcing treatment.
The purpose of carrying out static load test on the foundation is mainly to test the bearing capacity and the settlement condition of the foundation. Before prepressing the foundation projected by the support 4 assembled in the midspan bridge deck system, arranging settlement monitoring points of the foundation, and acquiring prepressing data of each settlement monitoring point in the foundation prepressing process for judging whether a static load test meets the construction requirements or not. And when the average value of the continuous 24-hour settlement of each monitoring point is less than 1mm or the average value of the continuous 72-hour settlement of each monitoring point is less than 5mm in the foundation preloading monitoring process, judging that the static load test meets the construction requirements. Here, the pre-pressing time of the foundation can be appropriately extended according to the construction plan and the turnover of the pre-pressed material, so that the foundation settlement approaches to stability.
After the static load test meets the construction requirements, a midspan bridge deck system assembling support 4 is erected on the foundation, and concrete blocks and sand bags are adopted to pre-press the midspan bridge deck system assembling support 4. In order to effectively observe the elevation of the strip-shaped support in the construction process, the elevation reference line is arranged on the steel pipe upright post of the mid-span bridge deck system assembling support 4, the elevation of the mid-span bridge deck system assembling support 4 in the installation process is regularly measured, and if the settlement exceeds a limit value or large uneven settlement is generated, the mid-span bridge deck system assembling support 4 is timely adjusted.
In this embodiment, as shown in fig. 3, the splicing steel longitudinal beam is hoisted from the mid-span 5 center line, the positioning is required to be accurate, and the next step of hoisting and splicing can be performed after the confirmation of the monitoring personnel. Specifically, after the steel cross beams are installed in place and welded into a whole, the steel longitudinal beams and the steel cross beams on the two sides are hoisted from the near end to the far end to be matched and butted, and then the punching nails and the high-strength bolts are inserted for temporary fixing. And adjusting the axes and the elevations of the longitudinal and transverse steel beams until the design and standard requirements are met, and replacing the punching nails temporarily fixed with the longitudinal steel beams one by using high-strength bolts to finish the initial screwing and final screwing of the high-strength bolts. Wherein, the high-strength bolt is screwed by a torque method and comprises initial screwing and final screwing. The high-strength bolt is screwed from the part with high rigidity in the node to the unconstrained edge, and the large node is screwed from the center to the periphery of the node. In addition, the initial screwing and the final screwing of the high-strength bolt are finished in the same working day.
In an embodiment, the step of sequentially hoisting the steel longitudinal beams along the centerline of the mid-span 5 toward the main pier arch 1 on the mid-span bridge deck assembly support 4 may specifically include:
after two steel cross beams and steel longitudinal beams are connected into a whole, hoisting and installing the whole from one side of the mid-span bridge deck system assembling support 4;
and hoisting and installing the other steel longitudinal cross beams from two sides of the mid-span bridge deck system assembling support 4 along the center line of the mid-span 5 to the direction of the main pier arch base 1.
In order to ensure the stability of the installation of the first section of steel beam, the two steel beams and the steel longitudinal beam are connected into a whole and then hoisted in the embodiment, and after the hoisting of the first section of steel beam is finished, the rest steel longitudinal beams are hoisted and installed from the two sides of the mid-span bridge deck assembling support 4 along the central line of the mid-span 5 in the direction of the main pier arch foundation 1. Specifically, after the steel cross beam is conveyed to a hoisting area of the crawler crane through the transportation flat car, the crawler crane is used for hoisting the steel cross beam and placing the steel cross beam on the mid-span bridge deck system assembling support 4, the three-way jack arranged on the mid-span bridge deck system assembling support 4 is used for accurately adjusting the position of the steel cross beam, when local dislocation exists, the 7-shaped adjusting beam and the jack are used for correcting, and when the deviation of the elevation and the plane position meets the standard tolerance value, welding and fixing are carried out.
In an embodiment, the arch bridge construction method may further include:
installing a bridge deck on the steel longitudinal beam, and pouring a wet joint;
and (3) erecting a main arch rib bracket 8 on the bridge deck for splicing the rest section main arch ribs 9.
In this embodiment, before the bridge deck is hoisted, attention should be paid to adjusting the installation direction of the bridge deck according to the design drawing, so as to ensure that the adjacent steel reinforcement frameworks are in staggered butt joint at the cast-in-place seam. When the bridge deck is installed, the bridge deck positioned in the middle of the midspan 5 is installed firstly, then the bridge deck is installed towards two sides of the midspan 5, and the alignment of the bridge deck is ensured; and after the bridge deck is installed in place, spot welding the reserved steel bars of the adjacent bridge deck to temporarily fix the bridge deck. When wet seam is pour, notice pre-buried well guardrail, limit guardrail reinforcing bar for follow-up well guardrail, the buildding of limit guardrail, wet seam is pour the back, strengthens the maintenance, prevents the shrinkage crack.
In addition, in order to reduce the influence of the mid-span bridge deck system assembling support 4 on the installation of the steel longitudinal and transverse beams, the mid-span 5 and the side-span of the bridge deck system are installed separately. The bridge deck system is firstly provided with the steel longitudinal beams and the bridge deck slab and poured with wet joints, when the strength of the wet joints meets the requirement and the mid-span bridge deck system assembling support 4 is settled stably, the main arch rib support 8 is erected, and the rest segment main arch ribs are installed to construct the main arch ribs 9.
In one embodiment, the step of sequentially completing the closure of the main arch rib 9 includes:
positioning and mounting a second section of main arch rib and the rest section of main arch rib by using the main arch rib bracket 8, and completing closure; and the second section main arch rib is respectively fixed with the first section main arch rib 3 and the steel longitudinal and transverse beams in a contraposition mode.
In the embodiment, the main arch rib support 8 is used for positioning and installing the second section of main arch rib and the rest section of main arch rib, the closing of the main arch rib 9 is completed, the arch rib support is removed, the height of the bridge deck system is adjusted by a jack or a sand cylinder, then the steel longitudinal beams and the bridge deck slab of the mid-span 5 and the side-span closing section are installed, and the concrete wet joint is poured to be connected into a whole.
And arranging a steel corbel on the second section main arch rib as a supporting point of the adjacent steel cross beam. When the second section main arch rib is hoisted, the second section main arch rib is hoisted to the mid-span bridge deck system assembling support 4 by adopting the crawler crane, and the hoisting process needs to be slowly adjusted, so that the second section main arch rib is prevented from greatly shaking and colliding with other structures. When the second-segment main arch rib is assembled, the butt joint of the second-segment main arch rib and the top opening of the first-segment main arch rib 3 is adjusted to ensure that the second-segment main arch rib is installed in place.
In an embodiment, in step S14, after the closing of the main arch ribs 9 is completed in sequence, the method may further include:
and (3) coating the surface of the main arch rib 9 with an anticorrosive coating, and removing the main arch rib support 8.
When the main arch rib 9 is in a humid and acidic atmosphere, the main arch rib is easily corroded and damaged by the external environment, and the service life of the arch bridge is influenced. Therefore, in the embodiment, the surface of the main arch rib 9 is coated with the anti-corrosion coating, the main arch rib 9 needs to be subjected to surface treatment before spraying, a clean surface is formed, the anti-corrosion coating is conveniently and uniformly attached to the surface of the main arch rib 9, and the materials of the anti-corrosion coating layers are selected according to the environment of the main arch rib 9.
In an embodiment, in step S12, the step of performing the first span construction process may specifically include:
erecting an edge arch rib bracket 6 between the pier stud 2 on the first side span side and the main pier arch seat 1 adjacent to the pier stud 2;
and constructing side arch ribs 7 based on the side arch rib brackets 6, and installing steel longitudinal beams and bridge decks opposite to the midspan 5 on the side arch ribs 7.
When the side arch rib support 6 is erected, a support upright post is arranged on the foundation according to the projection plane of the side arch rib 7 relative to the foundation, and the height of the support upright post is adapted to the height between the side arch rib 7 and the foundation; and connecting the adjacent support stand columns through parallel connection; erecting a bearing beam at the top end of the support upright column, and arranging a wedge-shaped cushion block above the bearing beam to match an included angle between the bearing beam and the side arch rib 7; finally, a distribution beam is laid above the wedge-shaped cushion block, and the surface formed by the distribution beam is matched with the bottom surface of the side arch rib 7. After the side arch rib support 6 is erected, constructing a side arch rib 7 based on the side arch rib support 6 to support a side span to be erected, installing a steel longitudinal beam and a bridge deck opposite to the midspan 5 on the side arch rib 7, and completing closure of the side span, the midspan 5 steel longitudinal beam and the bridge deck.
In an embodiment, in step S14, after completing the main arch rib 9 closing, the mid-span 5 closing with the first side span, and the mid-span 5 closing with the second side span in sequence, the method may further include:
and adjusting the line shape of the bridge deck system until the preset line shape is met, and dismantling the mid-span bridge deck system assembling support.
The integral linear measurement is carried out before the bridge deck system assembling support is unloaded, and the unloading can be carried out after the design requirements are met. Before formal unloading, the support restraint is removed, each unloading area is required to be in step and uniform in unloading force, unloading is carried out synchronously according to the longitudinal direction and the transverse direction, unloading is carried out from the center of the bridge to the two side parts, the characteristic of internal force transmission of the structure is followed, and the unloading points are symmetrical; the longitudinal unloading is carried out from the two main pier arch bases 1 to the midspan, the unloading process needs to be slow and cannot be completed at one time, and all the groups of supporting systems are in a loaded state. In the unloading process, the bridge deck support system points need to be strictly settled and observed, the data of each detection point is reported in time, monitoring points arranged on a steel member top plate need to be observed, and the stability of the line shape of the formed bridge is ensured.
In one embodiment, after removing the mid-span bridge deck system assembling support, the method may further include:
and tensioning the tie bars to enable the prestress data of the tie bars to meet the prestress requirement.
According to the embodiment, two ends of the tie bar can be simultaneously tensioned according to design requirements, and the tensioning control force of the tie bar is based on the tensioning force and the stretching amount of the tie bar after the trial tensioning test of the tie bar steel bundle is corrected until the prestress data of the tie bar meets the prestress requirement.
In summary, in the arch bridge construction method adapted to the removal progress provided by the present invention, during solidification of the pier stud at the first side span, the main arch rib is installed to close by using the temporary tie bar pulled up by the main pier abutment, after solidification of the pier stud at the first side span, the pier stud at the second side span is poured by using the formwork removed from the pier stud at the first side span, and then the second side span construction process is performed, so as to reduce the number of used formworks and ensure that the construction progress is performed as expected.
Although a few exemplary embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these exemplary embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (10)
1. An arch bridge construction method adapting to a removal progress is characterized by comprising the following steps:
pouring a main pier arch base, and mounting a first section of main arch rib on the main pier arch base;
erecting a mid-span bridge deck system assembling support, and subsequently performing a mid-span construction procedure; pouring a pier stud at the side of the first side span, and subsequently performing a first side span construction procedure;
after the main arch rib is installed to close the closure by using a temporary tie bar pulled on the main pier arch seat, pouring a pier stud at a second side span side by using a template detached from the pier stud at the first side span side, and subsequently performing a second side span construction procedure;
respectively completing mid-span and first side-span closure and mid-span and second side-span closure;
sequentially installing a suspender and a tie bar;
and (5) dismantling all temporary facilities to complete the construction of the arch bridge.
2. The arch bridge construction method adapting to the removal progress of claim 1, wherein the step of building the mid-span bridge deck assembling bracket comprises:
carrying out static load test on the projected foundation of the mid-span bridge deck system splicing support;
and after the static load test meets the construction requirements, erecting a mid-span bridge deck system assembling support on the foundation.
3. The arch bridge construction method according to claim 1, wherein the step of performing the mid-span construction process subsequently comprises:
and sequentially hoisting steel longitudinal beams on the mid-span bridge deck system assembling support along the mid-span central line towards the direction of the main pier arch center, and performing welding and high-strength bolt reinforcing treatment.
4. The arch bridge construction method adapting to the removal progress of claim 3, wherein the step of sequentially hoisting the steel longitudinal cross beams on the mid-span bridge deck assembling bracket along the mid-span central line to the direction of the main pier arch center comprises the following steps:
after two steel cross beams and steel longitudinal beams are connected into a whole, hoisting and installing the whole from one side of the mid-span bridge deck system assembling support;
and hoisting and installing the other steel longitudinal beams from the two sides of the mid-span bridge deck system assembling support along the mid-span central line to the direction of the main pier arch seat.
5. The arch bridge construction method according to claim 3, further comprising:
installing a bridge deck on the steel longitudinal beam, and pouring a wet joint;
and erecting a main arch rib bracket on the bridge deck for splicing the main arch ribs of the rest sections.
6. The arch bridge construction method according to claim 5, wherein the step of installing the main arch rib to close the closure by using the temporary tie bar pulled on the main pier abutment comprises:
during solidification of the pier stud on the first side span side, positioning and installing the second section of main arch rib and the rest section of main arch rib by using a temporary tie rod pulled on the main pier arch base, and completing closure; and the second section of main arch rib is respectively fixed with the first section of main arch rib and the steel longitudinal and transverse beams in a contraposition mode.
7. The arch bridge construction method according to claim 5, wherein the step of installing the main arch rib after closing the arch by using the temporary tie bar pulled on the main pier abutment further comprises:
and coating anti-corrosion coating on the surface of the main arch rib, and dismantling the main arch rib bracket.
8. The arch bridge construction method according to claim 1, wherein the step of performing the first side span construction process subsequently comprises:
erecting an edge arch rib bracket between the pier stud on the first side span side and the main pier arch seat adjacent to the pier stud;
and constructing side arch ribs based on the side arch rib supports, and installing steel longitudinal beams and bridge decks opposite to the middle span on the side arch ribs.
9. The arch bridge construction method adapting to the removal progress of claim 1, wherein after the mid-span and the first side-span are respectively closed and closed, the method further comprises:
and adjusting the line shape of the bridge deck system until the preset line shape is met, and dismantling the mid-span bridge deck system assembling support.
10. The arch bridge construction method according to claim 9, wherein after removing the mid-span bridge deck assembly support, further comprising:
and tensioning the tie bars to enable the prestress data of the tie bars to meet the prestress requirement.
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| CN111560835A (en) * | 2020-04-30 | 2020-08-21 | 中交路桥华南工程有限公司 | Method for installing and tensioning tie rod |
| CN113774796A (en) * | 2021-08-30 | 2021-12-10 | 中交一公局集团有限公司 | Main arch support structure of overpass bridge and mounting method |
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| CN110904854B (en) | 2021-06-04 |
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