CN110886237A - Arch bridge construction method - Google Patents

Abstract

The invention relates to the field of bridge construction, in particular to an arch bridge construction method, 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 side arch rib support is erected on the first side span side, a pier stud on the second side span side is poured, and a second side span construction procedure is subsequently carried out; sequentially completing main arch rib closure, midspan and first side span closure and midspan 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. 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.

Description

Arch bridge construction method

【Technical field】

The invention relates to the field of bridge construction, in particular to an arch bridge construction method.

【Background technique】

With the rapid development of the modern economy, the development of high-speed railways and highways has also entered a stage of rapid development, and there are more and more long-span bridges. Arch bridges have the advantages of large spanning capacity, simple structure, clear force, various forms, and beautiful appearance. High-speed railways and highways are more and more widely used, especially when they cross rivers in urban areas and suburbs.

In a concrete arch bridge, the arch rib is the main stress-bearing member of the bridge type. The conventional closing method is as follows: the reinforced concrete arch rib is poured in sequence from the arch foot to the vault to the top of the arch rib to the closing. The speed requirements are high, and the arch rib must be closed before the first pouring concrete and the initial setting. The concrete pouring process is difficult to control, has poor lateral stability, high risk, and takes a long time. In addition, in the construction method of conventional arch bridges, the assembly procedure of the bridge deck system is too rigid, and the construction of the two side spans also lacks effective coordination, which makes the construction efficiency of the arch bridge low.

[Content of the invention]

The purpose of the present invention is to provide an arch bridge construction method, to solve the problem that the current arch rib construction difficulty is relatively high, the lateral stability is poor, the time consuming is long, and the assembly procedure of the bridge deck system is too solid, and there is also a lack of space between the construction of the two side spans. Effective coordination, and then the construction efficiency of the arch bridge is low.

To achieve this purpose, the present invention adopts the following technical solutions:

The invention provides an arch bridge construction method, comprising the following steps:

pouring the main pier arch, and installing the first segment main arch rib on the main pier arch;

The mid-span bridge deck is assembled with brackets, and the mid-span construction process is carried out later; the piers on the side of the first side span are poured, and the first side-span construction process is carried out later;

After the side arch rib supports are erected on the side of the first side span, the piers on the side of the second side span are poured, and the second side span construction process is performed subsequently;

Complete the main arch rib closure, the middle span and the first side span closure, and the middle span and the second side span closure in sequence;

Install the boom and tie rod in sequence;

Remove all temporary facilities to complete the construction of the arch bridge.

In one embodiment, the step of erecting a mid-span bridge deck system assembling bracket includes:

Carry out a static load test on the foundation projected by the assembled bracket of the mid-span bridge deck;

When the static load test meets the construction requirements, a mid-span bridge deck system assembly bracket is erected on the foundation.

In one embodiment, the subsequent steps of performing the mid-span construction process include:

The steel longitudinal and transverse beams are hoisted sequentially along the mid-span centerline toward the main pier abutment on the middle-span bridge deck assembly bracket, and are welded and reinforced with high-strength bolts.

In one embodiment, the step of sequentially hoisting steel longitudinal and transverse beams along the mid-span centerline toward the main pier abutment on the mid-span bridge deck assembly bracket includes:

After connecting the two steel beams and the steel longitudinal beams into a whole, hoist and install from one side of the middle-span bridge deck system assembly bracket;

The remaining steel longitudinal beams are hoisted and installed from both sides of the mid-span bridge deck assembly bracket along the mid-span centerline toward the main pier arch seat.

In one embodiment, the construction method of the arch bridge further comprises:

Install bridge decks on the steel longitudinal beams, and perform wet joint pouring;

A main arch rib bracket is set up on the bridge deck for assembling the main arch ribs of the remaining segments.

In one embodiment, the steps of closing the main arch ribs in sequence include:

The main arch rib of the second segment and the main arch rib of the remaining segment are positioned and installed by the main arch rib bracket, and the closure is completed; wherein, the main arch rib of the second segment and the main arch rib of the first segment are respectively And the steel longitudinal beams are aligned and fixed.

In one embodiment, after completing the main arch rib closing in sequence, it also includes:

Apply anti-corrosion coating on the surface of the main arch rib, and remove the main arch rib support.

In one embodiment, the steps of subsequently performing the first side span construction process include:

A side arch rib bracket is erected between the pier column on the side of the first side span and the main pier arch seat adjacent to the pier column;

The side arch rib is constructed based on the side arch rib bracket, and the steel longitudinal beam and the bridge deck opposite to the mid-span are installed on the side arch rib.

In one embodiment, after completing the closure of the main arch rib, the closure of the mid-span and the first side span, and the closure of the mid-span and the second side-span in sequence, it also includes:

Adjust the alignment of the bridge deck until the preset alignment is met, and remove the mid-span bridge deck assembly bracket.

In one embodiment, after dismantling the middle-span bridge deck system assembling bracket, the method further includes:

Tension the tie rod to make the tie rod prestress data meet the prestress requirements.

Compared with the prior art, the present invention has the following advantages:

1. The construction method of the arch bridge provided by the present invention, by pouring the main pier arch seat, install the first segment main arch rib on the main pier arch seat, and set up the mid-span bridge deck system assembly bracket, and follow-up mid-span construction process; pour the pier on the side of the first side span, and then carry out the first side span construction process; after the side arch rib bracket is erected on the side of the first side span, pour the pier on the side of the second side span, and follow up The second side span construction process; complete the main arch rib closure, the middle span and the first side span closure, and the middle span and the second side span closure in sequence; install hangers and tie rods in sequence, and remove all temporary facilities to complete the arch bridge construction. By assembling the arch rib in sections, the present invention reduces the stress generated during the construction of the arch rib to the minimum, avoids the occurrence of the arch rib deformation problem caused by stress release, ensures the requirement of the arch rib linear shape, and at the same time the arch rib Reasonable segmentation improves the construction efficiency and saves the construction period. In addition, by installing the main arch rib of the first segment on the arch seat of the main pier, flexibly erecting the mid-span bridge deck system and assembling brackets to carry out the construction process of the mid-span; After the side arch rib brackets on one side span, the piers on the second side span side are poured, so that the construction of the two side spans can be flexibly matched and the construction efficiency of the arch bridge can be improved.

2. Carry out a static load test on the foundation projected by the mid-span bridge deck assembly bracket; when the static load test meets the construction requirements, set up the mid-span bridge deck system assembly bracket on the foundation to ensure the erected mid-span. The safety and stability of the bridge deck assembly bracket.

3. By hoisting the steel longitudinal beams in sequence along the mid-span centerline to the direction of the main pier arch on the middle-span bridge deck system assembly bracket, the steel longitudinal and transverse beams are hoisted in a reasonable and orderly manner, and the welding is carried out. And high-strength bolts are reinforced to improve the stability of steel longitudinal beams.

4. The construction method of the arch bridge provided by the present invention, by installing the bridge deck on the steel longitudinal beam, and performing wet joint pouring; and erecting a main arch rib bracket on the bridge deck for the remaining segment main arch ribs to ensure that the main arch rib can be assembled safely and stably according to the preset alignment.

5. In the construction method of the arch bridge provided by the present invention, the main arch rib of the second segment and the main arch rib of the remaining segment are positioned and installed by using the main arch rib bracket, and the closure is completed; during installation, the main arch of the second segment is installed. The ribs are respectively aligned and fixed with the main arch rib of the first segment and the steel longitudinal beam, so that the main arch rib and the main beam are stably connected, and the load of the main beam is carried by the main arch rib.

Additional aspects and advantages of the present invention will be set forth in part in the following description, which will be apparent from the following description, or may be learned by practice of the present invention.

【Description of drawings】

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a schematic flowchart of an embodiment of an arch bridge construction method of the present invention;

Fig. 2 is the construction schematic diagram of a kind of embodiment of the arch bridge construction method of the present invention;

Fig. 3 is the construction schematic diagram of the next stage of Fig. 2;

Fig. 4 is the construction schematic diagram of the next stage of Fig. 3;

FIG. 5 is a schematic construction diagram of another embodiment of the construction method of the arch bridge of the present invention.

【Detailed ways】

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.

As shown in Fig. 1 and in combination with Figs. 2-4, the present invention provides an arch bridge construction method to solve the problem of pouring the existing reinforced concrete arch rib from the arch foot to the arch top to the arch rib top and closing the dragon in turn. The requirements for the retarding time and pouring speed of the concrete are high, and the arch rib must be closed before the initial setting of the concrete. The concrete pouring process is difficult to control, the lateral stability is poor, the risk is high, and it takes a long time. In one embodiment, the construction method of the arch bridge comprises the following steps:

S11, pour the main pier arch 1, and install the first segment main arch rib 3 on the main pier arch 1;

In this step, four pairs of caps are cast on the projected foundation of the arch bridge, and the main pier arches 1 are cast on each cap. The four main pier arches 1 are enclosed in a rectangular shape and are respectively arranged on the Pour the underside of the main beam.

In the present application, the arched main arch rib is divided into a plurality of segments from the bottom end to the top end, and the segment main arch rib directly connected with the main pier arch 1 is the first segment main arch rib 3 , the segmental main arch rib located at the top of the main arch rib is taken as the last segment main arch rib. Since the main arch rib segment of the subsequent installation uses the main arch rib 3 of the first segment as the limiting device for installation and positioning, the main arch rib 3 of the first segment must be precisely installed. In the present application, after the main pier abutment 1 is poured, four first-segment main arch ribs 3 are installed on the main pier abutment 1 in the direction of the mid-span centerline, and the lower ends of the first-segment main arch ribs 3 are embedded in the main arch rib 3. The interior of the pier arch 1 is fixed, and the upper end is spliced with the main arch ribs of the remaining segments. Among them, the main arch rib is the main component of the main arch, and is used to support the load of the mid-span of the main beam.

S12, erecting the middle-span bridge deck system assembly bracket 4, and then performing the construction process of the middle-span 5; pouring the pier 2 on the side of the first side span, and then performing the first side-span construction process;

In this step, the bridge deck assembly bracket 4 can be built with the help of the main arch rib 3 of the first segment for the construction of the middle span, and the side span on any side is selected to cast the pier column 2 on the side of the first side span. 2. Build the first side span with the main pier arch 1, and fix the bridge deck assembly brackets 4 on both sides of the mid-span to be built with the main arch rib 3 of the first segment, and connect with the adjacent other The bridge deck assembly bracket 4 is connected into one body through a flat joint and a scissor brace. The height of the bridge deck assembly brackets 4 can be designed according to the height of the midspan to be built, and the number of the midspan bridge deck assembly brackets 4 is selected according to the span of the midspan to be built.

Further, the construction process of the mid-span 5 and the construction process of the first side span need to be carried out simultaneously, and the closing of the mid-span 5 and the first side span should be completed subsequently to ensure the completion of the arch bridge as scheduled. Wherein, the construction process of the middle span 5 may include the construction of the bridge deck system, the pouring of wet joints, the closing with the side spans, the setting of guardrails, and the like. The first side span construction process may include the laying of side span bridge decks, the construction of side arch ribs, and the closing of the middle span, and so on.

When erecting the mid-span bridge deck assembly bracket 4, according to the design elevation and pre-camber provided by the design, combined with the height of the foundation embedded parts obtained by actual measurement, determine the erection height of the steel pipe column, and then use the truck to lift the middle of the mid-span to both sides. Install the steel pipe column in the direction of the main pier arch 1. Among them, the steel pipe column is the main supporting member of the middle-span bridge deck assembly bracket 4 .

Further, in order to ensure the installation quality of the mid-span bridge deck system assembly bracket 4, the steel pipe columns and parallel joints are processed in strict accordance with the drawings, and then lifted and installed. When the steel pipe columns are processed, the corbels are welded according to the A 10mm thick connecting plate is welded on the outside of the column, and the size of the connecting plate is 300mm×150mm×10mm, which is used for fixing the steel pipe column and the foundation. When the mid-span bridge deck system assembly bracket 4 is installed, the steel pipe column and the parallel joint should be constructed synchronously, and the parallel joint is used to connect the two adjacent steel pipe columns into one body to strengthen the overall structure of the mid-span bridge deck system assembly bracket 4 stability. Among them, the installation verticality of the steel pipe column is required to be less than or equal to H/500, and not more than 5cm.

In addition, before hoisting, the elevation position of the parallel joint shall be determined according to the drawings. During the construction process, the quality and thickness of the welding seam between the parallel joint and the steel pipe column, the parallel joint and the scissor brace shall be strictly controlled, and the intersection of the two scissor braces shall be crossed. Spot welded as a whole. The flat joint adopts the method of full welding connection, the thickness of the welding seam shall not be less than the thickness of the base metal, and the surface of the welding seam shall not have defects such as pores, slag inclusions, arc craters, cracks, under-welding and other defects. After the quality is qualified, the next stage of construction can be carried out.

S13, after the side arch rib support 6 is erected on the side of the first side span, pour the pier 2 on the side of the second side span, and subsequently carry out the second side span construction process;

In this step, the side arch rib support 6 is built under the first side span, and the side arch rib 7 is poured by using the side arch rib support 6. After the side arch rib support 6 is erected, the pier column 2 on the second side span is poured, and the side arch rib 7 is poured. Followed by the second side span construction process. The side arch rib 7 is used for supporting the first side span. The second side span construction process may include laying side span bridge decks, building side arch ribs, and closing with the middle span, and so on.

S14, complete the closure of main arch rib 9, the closure of the middle span 5 and the first side span, and the closure of the middle span 5 and the second side span in sequence;

This step starts from the two bottom ends of the main arch rib and assembles the main arch rib of each segment upward in sequence. When assembling, align the bottom of the main arch rib of the next segment with the top of the main arch rib of the previous segment and install Fix, and so on, until it is installed to the closing segment arch rib at the top of the main arch rib, and the closing of the two closing segment arch ribs is completed. Then complete 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, and hoist the "Tian Yuan Di" decorative panel. After the whole bridge is hoisted, accurately adjust the elevation of the main arch rib 9 of each segment. , weld the annular seam between the segments, and remove the main arch rib 9 bracket.

S15. Install the boom and the tie rod in sequence;

In this step, after the main arch rib 9 is constructed, a hanger is installed between the main arch rib 9 and the mid-span, so as to transmit part of the load of the main girder to the main arch rib 9 as a force transmission member. The invention can design a total of 11 groups of 22 hangers in the whole bridge, the distance between two adjacent hangers is set to 6.2m, the hangers are made of steel strands and the whole bundle of extruded cables, and the cable body is sprayed with a single anti-corrosion epoxy. The steel strands are formed by twisting and wrapping high-strength polyester tapes. The tensile strength is ≥1860Mpa, the diameter is 15.2mm, and the elastic modulus Ep=1.9×105MPa. The single steel strands are filled with grease or wax. A polyethylene layer is extruded on the outside of the whole strand of steel strand, and the outer layer of the whole boom is equipped with a sheath.

Among them, the upper end of the boom can use a fixed-end anchor, and the spherical support and the backing plate of the upper anchor head are anchored to the main arch rib 9, and the length of the boom can be adjusted by adjusting the position of the nut; the lower end of the boom can use the tension end Anchor, the lower anchor head is connected by a pin.

Further, the arch bridge of the present invention is also installed with tie rods, and the two ends of the tie rods are respectively connected with the rectangular side arch rib 7 cushion beams opposite to the longitudinal bridge direction, and the side arch rib 7 cushion beams are cast on the side arches. The upper end of the rib 7 to balance the horizontal thrust of the main beam. In addition, by installing the main arch rib of the first segment on the arch seat of the main pier, flexibly erecting the mid-span bridge deck system and assembling brackets to carry out the construction process of the mid-span; After the side arch rib brackets on one side span, the piers on the second side span side are poured, so that the construction of the two side spans can be flexibly matched and the construction efficiency of the arch bridge can be improved.

S16. Remove all temporary facilities to complete the construction of the arch bridge.

In this step, after the construction of each structure of the arch bridge is completed, all temporary facilities such as installation brackets are removed, thereby completing the construction of the arch bridge. Wherein, the temporary facilities include bridge deck assembly brackets, main arch rib brackets, side arch rib brackets and other auxiliary facilities.

By assembling the arch rib in sections, the present invention reduces the stress generated during the construction of the arch rib to the minimum, avoids the occurrence of the arch rib deformation problem caused by stress release, ensures the requirement of the arch rib linear shape, and at the same time the arch rib Reasonable segmentation improves the construction efficiency and saves the construction period.

The construction of the bridge will involve demolition in the early stage. If the construction period is tight, especially when the construction site at the side span cannot start at the scheduled time due to the lag in the demolition progress, the normal progress of the construction will be affected. Therefore, in order to adapt to the demolition progress of the side spans, the present invention also provides an arch bridge construction method adapted to the demolition progress, as shown in FIG. The specific contents of S23 and S24 are as follows:

S23. After installing the main arch rib 9 to the closure by using the temporary tie rods pulled from the main pier arch 1, use the template removed from the pier column 2 on the first side span to pour the pier column 2 on the second side span side , and then proceed to the second side span construction process;

In this step, as shown in Figure 5, when the demolition of the pier column 2 on the first side span is delayed for a long time, the temporary tie rod 10 is pulled on the main pier abutment 1, and the installation is based on the temporary tie rod 10. The main arch rib 9 of the remaining segment until the closing dragon. Considering the turnover possibility of the formwork, after the pier column 2 on the first side span is solidified, the formwork of the pier column 2 on the first side span side is removed, and the pier column 2 on the second side span side is poured using the formwork.

S24. Complete the closing of the mid-span 5 and the first-side crossing respectively, and the closing of the mid-span 5 and the second-side crossing;

When the pier column 2 on the first side span and the pier column 2 on the second side span side are all poured, the steel longitudinal beams and bridge decks on the first side span side and the second side span side are installed, and the middle span is completed. 5 and the first side span steel longitudinal beam and bridge deck, and the middle span 5 and the second side span steel longitudinal beam and bridge deck.

In the present invention, during the solidification of the pier on the side of the first side span, the main arch rib is installed to the Helong by using the temporary tie rods 10 drawn on the arch seat of the main pier. The formwork removed from the pier column on the side of the first side span is poured into the pier column on the side of the second side span, and the second side span construction process is carried out subsequently to reduce the number of formwork used and ensure that the construction progress is carried out on schedule.

In one embodiment, in step S23, the step of installing the main arch rib 9 to the closure by using the temporary tie rods 10 pulled on the main pier abutment 1 may specifically include:

During the solidification of the pier column 2 on the side of the first side span, the main arch rib of the second segment and the main arch rib of the remaining segment are positioned and installed by using the temporary tie rods 10 drawn on the main pier abutment 1, and the closure is completed; wherein, The main arch ribs of the second segment are respectively aligned and fixed with the main arch ribs 3 of the first segment and the steel longitudinal beams.

In this embodiment, during the solidification of the pier column 2 on the side of the first side span, a temporary tie rod 10 is drawn on the main pier abutment 1, and the temporary tie rod 10 is used to locate and install the main arch rib of the second section and the remaining sections. The main arch rib of the section is completed, and the main arch rib 9 is closed, and the arch rib bracket is removed, the elevation of the bridge deck system is adjusted with a jack or a sand cylinder, and then the steel longitudinal beam and bridge deck of the closed section of the middle span 5 and the side span are installed, and concrete is poured. Wet seams join together.

Steel corbels are set on the main arch rib of the second segment as the support point for the adjacent steel beams. When the main arch rib of the second section is hoisted, the crawler crane is used to hoist the main arch rib of the second section to the assembling bracket 4 of the mid-span bridge deck. During the hoisting process, it should be adjusted slowly to avoid large shaking and collision with other structures . When assembling the main arch rib of the second segment, adjust the butt joint of the main arch rib of the second segment and the top opening of the main arch rib 3 of the first segment to ensure the installation in place.

In one embodiment, in step S12, the step of erecting the mid-span bridge deck is to assemble the bracket 4, and the subsequent steps of performing the mid-span construction process may specifically include:

Carry out a static load test on the foundation projected by the middle-span bridge deck system assembled bracket 4;

When the static load test meets the construction requirements, a mid-span bridge deck system assembling bracket 4 is erected on the foundation;

On the middle-span bridge deck assembly bracket 4, the steel longitudinal beams are sequentially hoisted along the middle-span centerline in the direction of the main pier abutment 1, and are welded and reinforced with high-strength bolts.

The purpose of the static load test on the foundation is mainly to check the bearing capacity and settlement condition of the foundation. Before pre-pressing the foundation projected by the assembling bracket 4 of the mid-span bridge deck, firstly arrange the settlement monitoring points of the foundation. meet construction requirements. During the monitoring process of foundation preloading, if the average value of the settlement of each monitoring point for 24 hours is less than 1mm, or the average value of the settlement of each monitoring point for 72 hours is less than 5mm, the static load test is judged to meet the construction requirements. Here, according to the construction plan and the turnover of preloaded materials, the preloading time of the foundation can be appropriately extended to make the settlement of the foundation close to stability.

When the static load test meets the construction requirements, a mid-span bridge deck assembly bracket 4 is erected on the foundation, and concrete blocks and sand bags are used to preload the mid-span bridge deck assembly bracket 4. In order to effectively observe the elevation of the strip support during the construction process, the present invention sets an elevation reference line on the steel pipe column of the mid-span bridge deck system assembled support 4, and regularly measures the height of the mid-span bridge deck system assembled support 4 during the installation process. Elevation, if it is found that the settlement exceeds the limit value, or a large uneven settlement occurs, the mid-span bridge deck should be adjusted in time to assemble the bracket 4.

In this embodiment, as shown in FIG. 3 , the hoisting and splicing of steel vertical and horizontal beams is started from the center line of the mid-span 5, and the positioning is required to be accurate. Specifically, after the steel beams are installed in place and welded into a whole, the steel longitudinal beams and the steel beams on both sides are hoisted from the proximal end to the distal end, matched and butted, and then punched nails and high-strength bolts are inserted for temporary fixing. Adjust the axis and elevation of the steel longitudinal beam until the design and specification requirements are met, and replace the punching nails temporarily fixed with the steel longitudinal beam one by one with high-strength bolts to complete the initial and final tightening of the high-strength bolts. Among them, the high-strength bolts are screwed by the torque method, which is divided into initial screwing and final screwing. The tightening sequence of high-strength bolts should be carried out from the rigid part of the joint to the unconstrained edge, and for large joints, it should be carried out from the center of the joint to the periphery. In addition, the initial and final tightening of high-strength bolts should be completed within the same working day.

In one embodiment, the steps of sequentially hoisting steel longitudinal beams along the centerline of the mid-span 5 to the direction of the main pier arch 1 on the mid-span bridge deck assembling bracket 4 may specifically include:

After connecting the two steel beams and the steel longitudinal beams into a whole, hoist and install from one side of the middle-span bridge deck system assembling bracket 4;

The remaining steel longitudinal beams are hoisted and installed from both sides of the mid-span bridge deck assembling bracket 4 along the center line of the mid-span 5 to the direction of the main pier abutment 1 .

In order to ensure the stability of the installation of the first steel beam, in this embodiment, the two steel beams and the steel longitudinal beam are connected into a whole and then hoisted. After the first steel beam is hoisted, the remaining steel longitudinal beams are removed from the middle span. Both sides of the bridge deck assembly bracket 4 are hoisted and installed in the direction of the main pier abutment 1 along the center line of the mid-span 5 . Specifically, after the steel beam is transported to the hoisting area of the crawler crane by the transport flatbed truck, the steel beam is hoisted by the crawler crane and placed on the mid-span bridge deck assembly bracket 4, and the three-way jack set on the mid-span bridge deck assembly bracket 4 is used. The position of the steel beam is precisely adjusted. When there is local dislocation, the "7"-shaped adjusting beam and jack are used for correction. When the elevation and plane position deviation meet the allowable value of the specification, welding and fixing are carried out.

In one embodiment, the construction method of the arch bridge may further include:

Install bridge decks on the steel longitudinal beams, and perform wet joint pouring;

A main arch rib bracket 8 is erected on the bridge deck for assembling the main arch rib 9 of the remaining segments.

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 drawings to ensure that the adjacent steel skeletons are staggered at the cast-in-place joints. When the bridge deck is installed, first install the bridge deck located in the middle of the mid-span 5, and then install it to both sides of the mid-span 5, and ensure that the bridge deck is aligned; Fixed bridge deck. When the wet joint is poured, pay attention to pre-embedding the steel bars of the middle guardrail and side guardrail for the subsequent construction of the middle guardrail and side guardrail. After the wet joint is poured, strengthen the maintenance to prevent shrinkage cracks.

In addition, in order to reduce the influence of the assembling bracket 4 of the mid-span bridge deck on the installation of the steel longitudinal beams, the mid-span 5 and the side spans of the bridge deck are installed separately. The bridge deck is to install steel longitudinal beams, bridge decks, and pour wet joints. When the strength of the wet joints meets the requirements, and the middle-span bridge deck system assembly brackets 4 settle down and stabilize, the main arch rib brackets 8 are erected, and the remaining segments are installed. Arch rib to construct the main arch rib 9.

In one embodiment, the steps of closing the main arch rib 9 in sequence include:

Use the main arch rib bracket 8 to locate and install the main arch rib of the second segment and the main arch rib of the remaining segment, and complete the closing; wherein, the main arch rib of the second segment is respectively connected to the main arch of the first segment. Rib 3 and steel longitudinal beams are aligned and fixed.

In this embodiment, the main arch rib of the second segment and the main arch rib of the remaining segments are positioned and installed by the main arch rib bracket 8, and the main arch rib 9 is closed, and the arch rib bracket is removed, and the bridge is adjusted with a jack or a sand cylinder. The elevation of the surface is determined, and then the steel longitudinal beams and bridge decks of the mid-span 5 and the side-span closed section are installed, and the concrete wet joints are poured to form a whole.

Steel corbels are set on the main arch rib of the second segment as the support point for the adjacent steel beams. When the main arch rib of the second section is hoisted, the crawler crane is used to hoist the main arch rib of the second section to the assembling bracket 4 of the mid-span bridge deck. During the hoisting process, it should be adjusted slowly to avoid large shaking and collision with other structures . When assembling the main arch rib of the second segment, adjust the butt joint of the main arch rib of the second segment and the top opening of the main arch rib 3 of the first segment to ensure the installation in place.

In one embodiment, in step S14, after the main arch rib 9 is closed in sequence, it may further include:

Apply anti-corrosion coating on the surface of the main arch rib 9 and remove the main arch rib bracket 8 .

When the main arch rib 9 is in a humid and acidic atmosphere, it is easily damaged by the corrosion of the external environment, which affects the service life of the arch bridge. Therefore, in this embodiment, anti-corrosion coating is applied on the surface of the main arch rib 9. Before spraying, the main arch rib 9 needs to be surface-treated to form a clean surface, so that the anti-corrosion coating can be evenly attached to the surface of the main arch rib 9. The material for each coating is selected according to the environment in which the main arch rib 9 is located.

In one embodiment, in step S12, the subsequent steps of performing the first side span construction process may specifically include:

A side arch rib bracket 6 is erected between the pier column 2 on the side of the first side span and the main pier arch 1 adjacent to the pier column 2;

The side arch rib 7 is constructed based on the side arch rib bracket 6 , and the steel longitudinal beam and the bridge deck opposite to the mid-span 5 are installed on the side arch rib 7 .

When erecting the side arch rib support 6, a support column is arranged on the foundation according to the projection surface of the side arch rib 7 relative to the foundation, and the height of the support column is adapted to the height between the side arch rib 7 and the foundation; The adjacent support columns are connected; a load-bearing beam is erected at the top of the support column, and a wedge-shaped spacer is set above the load-bearing beam to match the angle between the load-bearing beam and the side arch rib 7; finally, above the wedge-shaped spacer The distribution beam is laid so that the surface formed by the distribution beam matches the bottom surface of the side arch rib 7 . After the side arch rib support 6 is erected, the side arch rib 7 is constructed based on the side arch rib support 6 to support the side span to be built, and the steel longitudinal and transverse steel relative to the middle span 5 is installed on the side arch rib 7. Beams and bridge decks, complete the closure of side span and mid span 5 steel longitudinal beams and bridge decks.

In one embodiment, in step S14, after completing the closing of the main arch rib 9, the closing of the middle span 5 and the first side span, and the closing of the middle span 5 and the second side span in sequence, it may further include:

Adjust the alignment of the bridge deck until the preset alignment is met, and remove the mid-span bridge deck assembly bracket.

Before unloading the bridge deck assembly bracket, the overall linear measurement should be carried out, and the unloading can only be carried out after meeting the design requirements. Before the official unloading, the restraint of the bearing should be lifted first. The unloading of each unloading area should be in step with uniform unloading force, and the unloading should be graded and synchronized according to the vertical and horizontal directions. The unloading point should be symmetrical; the longitudinal unloading should be unloaded from the arch seat of the two main piers to the mid-span. During the unloading process, it is necessary to carry out strict settlement observation of the bridge deck support system points, report the data of each detection point in time, and also observe the monitoring points set on the top plate of the steel member to ensure the stability of the bridge alignment.

In one embodiment, after removing the middle-span bridge deck system assembling bracket, it may further include:

Tension the tie rod to make the tie rod prestress data meet the prestress requirements.

In this embodiment, both ends of the tie rod can be tensioned at the same time according to the design requirements. The tension control force of the tie rod is based on the corrected tension force and elongation of the tie rod steel bundle trial tension test, until the prestress data of the tie rod is satisfied. Prestressing requirements.

To sum up, in the construction method of the arch bridge provided by the present invention, the main pier arch seat is poured, the first segment main arch rib is installed on the main pier arch seat, and the mid-span bridge deck system assembly bracket is erected, and the subsequent steps are carried out. The construction process of the middle span; the pier columns on the side of the first side span are poured, and the first side span construction process is carried out subsequently; And follow up the second side span construction process; complete the main arch rib closure, the middle span and the first side span closure, and the middle span and the second side span closure in sequence; install hangers and tie rods in sequence, and remove all temporary facilities to Completion of the construction of the arch bridge. By assembling the arch rib in sections, the present invention reduces the stress generated during the construction of the arch rib to the minimum, avoids the occurrence of the arch rib deformation problem caused by stress release, ensures the requirement of the arch rib linear shape, and at the same time the arch rib Reasonable segmentation improves the construction efficiency and saves the construction period. In addition, by installing the main arch rib of the first segment on the arch seat of the main pier, flexibly erecting the mid-span bridge deck system and assembling brackets to carry out the construction process of the mid-span; After the side arch rib brackets on one side span, the piers on the second side span side are poured, so that the construction of the two side spans can be flexibly matched and the construction efficiency of the arch bridge can be improved.

Although some exemplary embodiments of the present invention have been shown above, those skilled in the art will appreciate that The scope is defined by the claims and their equivalents.

Claims (10)

1. An arch bridge construction method 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 side arch rib support is erected on the first side span side, a pier stud on the second side span side is poured, and a second side span construction procedure is subsequently carried out;

sequentially completing main arch rib closure, midspan and first side span closure and midspan 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 according to claim 1, wherein the step of building 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.

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 according to claim 3, wherein the step of sequentially hoisting the steel longitudinal beams along the midspan central line to the direction of the main pier arch on the midspan bridge deck assembly 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.

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. A method for constructing an arch bridge according to claim 5, wherein the step of sequentially completing the closure of the main arch ribs comprises:

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, 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, further comprising, after the main arch rib closure is sequentially completed:

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 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 according to claim 1, further comprising, after completing the main arch rib closure, the mid-span closure with the first side span, and the mid-span closure with the second side span in sequence:

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, further comprising, after removing the mid-span deck assembly support:

and tensioning the tie bars to enable the prestress data of the tie bars to meet the prestress requirement.

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