Vertical assembly and swivel construction method for arch rib

Abstract

Provided in the present invention is a vertical assembly and swivel construction method for an arch rib. The vertical assembly and swivel construction method comprises the following steps: constructing a lowering cable fixing foundation and a guy cable fixing foundation; vertically assembling arch rib segments, and mounting and pre-tightening a lowering cable and a guy cable; and performing swivel construction, which comprises coordinatively adjusting the lengths of the lowering cable and the guy cable, such that the lower end of the arch rib segments take a rotatable structure as the axis, and the upper portion of the arch rib segments rotates downwards to reach a design position. By using the construction method of the present invention, swivel construction of an arch rib can be completed without the need to set up a support in water; thus, the impact on channel passage and flood discharge can be avoided, and the construction period is also effectively shortened.

Description

Arch rib vertical assembly and swivel construction method TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction, in particular to an arch rib vertical assembly and swivel construction method. BACKGROUND

[0002] With the development of society, the structure and shape of bridges are becoming more and more rich, and the steel pipe concrete arch bridge is widely used in modern bridge construction due to its unique structure, beautiful shape and strong bearing capacity. The main arch rib of the steel pipe concrete arch bridge adopts a steel pipe concrete structure, and the construction of the steel pipe concrete structure generally involves first building a steel pipe structure and then filling concrete in the steel pipe. The radial constraint of the steel pipe limits the expansion of the compressed concrete, so that the concrete is in a three-way compression state, thereby significantly improving the compressive strength of the concrete.

[0003] At present, the vertical swivel construction of the steel pipe arch bridge is mostly by lying assembly and vertical lifting. When assembling, a lying assembly support needs to be erected, such as the invention patent application CN 118375076A which discloses a construction method for arch rib vertical swivel by using rigid jacking. The main beam support, main beam, arch foot and arch rib support need to be installed in advance, a pair of arch ribs are placed on the arch rib support on the side to support the arch rib, and then the corresponding vertical swivel construction operation can be performed. After the operation is completed, the main beam support and the arch rib support need to be removed. However, if the bridge site is located in a river, the support needs to be erected in the water, which will affect the navigation and flood discharge to some extent. If the bridge site is located in a valley, the height of the support will be too high to be erected, which will further prolong the construction period. Therefore, it is necessary to research a new vertical swivel construction method to solve the above problems. SUMMARY

[0004] The present application provides an arch rib vertical assembly and swivel construction method, which can complete the swivel construction of the arch rib without erecting a support in the water, avoiding the influence on navigation and flood discharge, and effectively shortening the construction period.

[0005] To achieve the above purpose, the technical scheme of the present application is as follows:

[0006] An arch rib vertical assembly and swivel construction method, comprising the following steps:

[0007] Construction of the lowering cable fixed foundation and the wind cable fixed foundation: the construction of the lowering cable fixed foundation is completed in the rear of the arch seat, and the construction of the wind cable fixed foundation is completed in the front of the arch seat;

[0008] Assembling the arch rib segments and installing the lowering cable and the wind-catching cable: the rotatable structure is connected to the arch seat at the lower end of the arch rib segment closest to the arch seat, and then the arch rib segments on one side of the arch rib are vertically assembled one by one upwards until the designed length is reached; in the process of vertical assembly or after the vertical assembly is completed, the lowering cable is installed behind the rotating direction of the arch rib segment and is pre-tightened, the length of the lowering cable is adjustable, one end of the lowering cable is connected to the lowering cable fixed base, and the other end is connected to the arch rib segment; the wind-catching cable is installed below the front of the rotating direction of the arch rib segment and is pre-tightened, the length of the wind-catching cable is adjustable, one end of the wind-catching cable is connected to the wind-catching cable fixed base, and the other end is connected to the arch rib segment;

[0009] Swivel construction: the lengths of the lowering cable and the wind-catching cable are adjusted to make the lower end of the arch rib segment rotate downwards around the rotatable structure to the designed position.

[0010] Preferably, the top of the lowering cable fixed base is provided with a tensioning jack, one end of the lowering cable is connected to the lowering cable fixed base through the tensioning jack; the top of the wind-catching cable fixed base is provided with a front anchoring jack, one end of the wind-catching cable is connected to the wind-catching cable fixed base through the front anchoring jack.

[0011] Preferably, the lowering cable fixed base comprises a vertical tower, a first pile foundation and a first pile foundation, the top of the first pile foundation is fixed with the first pile foundation, the first pile foundation is provided with at least two, and the top of the first pile foundation is fixed with a vertical tower, the vertical tower comprises a column and a cross connection, the column is provided with at least two, which are respectively connected to one of the first pile foundations, the columns are arranged along the width direction of the arch rib, and at least two cross connections are arranged between adjacent columns.

[0012] Preferably, the top of the lowering cable fixed base is symmetrically fixed with two groups of first tensioning jacks and second tensioning jacks on both sides, the lowering cable comprises a first lowering cable and a second lowering cable; one end of the first tensioning jack is connected to one end of the first lowering cable, the other end of the first lowering cable is connected to the upper part of the arch ring on the same side of the arch rib segment; one end of the second tensioning jack is connected to one end of the second lowering cable, and the other end of the second lowering cable is connected to the lower part of the arch ring on the same side of the arch rib segment.

[0013] Preferably, the rear of the lowering cable fixed base is further provided with a rear anchoring device, the rear anchoring device is connected to the top of the lowering cable fixed base through an anchoring cable;

[0014] During the construction of the lowering cable fixed base and the wind-catching cable fixed base, the construction of the rear anchoring device is completed, and the anchoring cable is connected between the rear anchoring device and the lowering cable fixed base and is pre-tightened.

[0015] Preferably, the rear anchoring device comprises second bearing platforms and second pile foundations, the second pile foundations are fixed with the second bearing platforms at the top, and the second bearing platforms are provided with at least two, and the rear anchoring jacks are fixed at the top of the second bearing platforms, the rear anchoring jacks are connected with one end of the anchoring cable, and the other end of the anchoring cable is connected with the top of the same side of the wind cable fixing foundation.

[0016] Preferably, the wind cable fixing foundation comprises third bearing platforms and third pile foundations, the third pile foundations are fixed with the third bearing platforms at the top, and the third bearing platforms are provided with at least two and are lower than the connection position of the lowering cable and the arch rib segment;

[0017] The third bearing platforms are provided with front anchoring jacks at the top, the front anchoring jacks comprise two groups of first front anchoring jacks and two groups of second front anchoring jacks, and the wind cable comprises first wind cables and second wind cables; each of the third bearing platforms is fixed with a group of the first front anchoring jacks and a group of the second front anchoring jacks at the top, two groups of the first front anchoring jacks are respectively connected with one end of the first wind cable, the other end of the first wind cable is respectively connected with the upper part of the same side of the arch ring in the arch rib segment, two groups of the second front anchoring jacks are respectively connected with one end of the second wind cable, and the other end of the second wind cable is respectively connected with the lower part of the same side of the arch ring in the arch rib segment.

[0018] Preferably, during the assembly of the arch rib segments and the rotation construction, a monitoring system is used to monitor the position and linear type of the arch rib, the monitoring system comprises a 4D laser point cloud acquisition device and a lowering control system, the lowering control system is electrically connected with the 4D laser point cloud acquisition device, the lowering cable and the wind cable, the 4D laser point cloud acquisition device is installed in front of and behind the arch rib segment, is used to acquire data including the position coordinates and linear type of the arch rib segment, and transmits the data to the lowering control system, and the lowering control system controls the length and cable force of the lowering cable and the wind cable, so that the installation position and the lowering position of the arch rib segment are controlled within an error range.

[0019] Preferably, after the rotatable structure is installed, temporary fixing structures are installed at the front and rear of the lower end of the arch rib segment closest to the arch seat, so that the arch rib segment closest to the arch seat is fixed with the arch seat.

[0020] Before the rotation construction, the temporary fixing structures are removed.

[0021] Preferably, before the assembly of the arch rib segments and the installation of the lowering cable and the wind cable, the construction of the rear anchoring device, the lowering cable fixing foundation and the wind cable fixing foundation is completed in advance, the anchoring cable is connected between the rear anchoring device and the lowering cable fixing foundation and is pre-tightened.

[0022] Preferably, the temporary fixing structure is removed before the unloading device is installed under and beside the arch rib; the unloading device comprises a reverse jacking mechanism and a jacking mechanism, the reverse jacking mechanism comprises a rigid support structure, one end of which is matched with the outer side of the temporary anchoring state position of the bottom chord of the arch rib, and the other end is fixed on the arch seat, the jacking mechanism comprises an upper sealing plate, a lower sealing plate and a jacking jack group, the upper sealing plate is used for matching and fixedly connecting with the bottom surface of the bottom chord of the arch rib, the lower sealing plate is used for matching and fixedly connecting with the top surface of the temporary fixing structure which is temporarily anchored under the bottom chord of the arch rib and has completed cutting separation, and the jacking jack group is fixed between the upper sealing plate and the lower sealing plate.

[0023] Before the temporary fixing structure is removed, the rigid support structure is fixed on the outer side of the top chord of the arch rib, and the top of the rigid support structure is tightly matched with the outer side of the top chord of the arch rib; after the connection between one bottom chord of the arch rib and the temporary fixing structure is removed, the upper sealing plate and the lower sealing plate are respectively welded to the bottom surface of the bottom chord of the arch rib and the top surface of the temporary fixing structure which has completed cutting separation, and the jacking jack group is placed to be jacked to a corresponding height, so that the bottom chord of the arch rib is supported by the jacking jack group; after the connection between all the bottom chords of the arch rib and the temporary fixing structure is removed and the jacking device is installed, the jacking height of the jacking jack group is adjusted, so that the jacking height is coordinated with the lowering cable and the wind catching cable to control the arch rib to be slowly lowered.

[0024] The arch rib vertical assembly and swivel construction method has the following advantages:

[0025] (1) In the present application, the arch rib segments are vertically installed, so that the support frame does not need to be erected in water, the influence on the navigation channel and the flood discharge is avoided, the problem of difficult erection caused by the high height of the support frame in the valley area is solved, the construction period is effectively shortened, and the construction cost of erecting the support frame is reduced.

[0026] (2) In the present application, the wind catching cable and the lowering cable are combined to form a cable system, the arch rib is prevented from being tilted upward after being subjected to the longitudinal wind load in the instant of lowering by pre-tightening each cable, and the stability of the vertical assembly is increased.

[0027] (3) The present application further combines the temporary fixing structure and the post-anchoring structure, so that the stability of the vertical assembly of the arch rib segments is further ensured, and the safety of the swivel process is better ensured. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 is a schematic view of the erection of the post-anchoring device, the fixing base of the lowering cable and the fixing base of the wind catching cable in the construction method of the present application.

[0029] Fig. 2 is a schematic view of the installation of the rotatable structure at the lower end of the arch rib segment closest to the arch seat and the connection with the arch seat in the construction method of the present application.

[0030] Figure 3 is a schematic diagram of the construction method of the present application, showing the assembly of the arch rib segments to the designed length on one side.

[0031] Figure 4 is a schematic diagram of the construction method of the present application, showing the removal of the temporary fixing structure.

[0032] Figure 5 is a schematic diagram of the construction method of the present application, showing the rotation of the arch rib segments to the designed position.

[0033] Figure 6 is a schematic diagram of the construction method of the present application, showing the installation of the force relieving device before the removal of the temporary fixing structure.

[0034] Figure 7 is a schematic diagram of the structure of the counter-jacking mechanism.

[0035] Figure 8 is a schematic diagram of the structure of the jacking mechanism.

[0036] In the figures, the rear anchoring device 100, the second bearing platform 101, the second pile foundation 102, the lowering cable fixed foundation 200, the first bearing platform 201, the first pile foundation 202, the vertical rotating tower 203, the arch seat 300, the rotatable structure 400, the lower rotating hinge 401, the upper rotating hinge 402, the rotating shaft 403, the wind-catching cable fixed foundation 500, the third bearing platform 501, the third pile foundation 502, the temporary fixing structure 600, the rear end temporary fixing structure 601, the front end temporary fixing structure 602, the arch rib segment 700, the ladder cage 800, the arch rib support 900, the tensioning jack 1000, the first tensioning jack 1001, the second tensioning jack 1002, the rear anchoring jack 1100, the front anchoring jack 1200, the first front anchoring jack 1201, the second front anchoring jack 1202, the lowering cable 1300, the first lowering cable 1301, the second lowering cable 1302, the wind-catching cable 1400, the first wind-catching cable 1401, the second wind-catching cable 1402, the anchoring cable 1500, the arch rib upper chord 1600, the counter-jacking mechanism 1700, the pre-buried steel plate 1701, the rigid support plate 1702, the steel plate 1703, the arch rib lower chord 1800, the jacking mechanism 1900, the upper sealing plate 1901, the jacking jack group 1902, the lower sealing plate 1903. DETAILED DESCRIPTION

[0037] The present application is further described below in conjunction with specific embodiments, but the scope of protection of the present application is not limited to the following embodiments.

[0038] Embodiment 1

[0039] An arch rib vertical assembly and rotating construction method, comprising the following steps:

[0040] Construction of the lowering cable fixed foundation 200 and the wind embracing cable fixed foundation 500: in combination with the figure 1, the construction of the lowering cable fixed foundation 200 is completed in advance behind the arch seat 300, and the construction of the wind embracing cable fixed foundation 500 is completed in front of the arch seat 300; there is no strict requirement for the construction sequence of the arch seat 300, the lowering cable fixed foundation 200 and the wind embracing cable fixed foundation 500, which can be performed simultaneously, alternately or in a certain sequence, as long as it is completed before the next step.

[0041] Assembling the arch rib segment 700 and installing the lowering cable 1300 and the wind embracing cable 1400: as shown in the figure 2, the rotatable structure 400 is installed at the lower end of the arch rib segment 700 closest to the arch seat 300 to connect with the arch seat 300, of course, the corresponding embedded part is also provided in the arch seat 300 to realize the connection of the arch rib segment 700; then the arch rib segment 700 on one side of the arch rib is vertically assembled in sequence until the designed length is reached, that is, the state shown in the figure 3, since the arch rib segment 700 is vertically installed, it is not necessary to erect a support in the water, the large crane can be used to hoist the arch rib segment 700 section by section during the assembly, and after hoisting in place, it is welded with the previous arch rib segment 700; during the vertical assembly or after the vertical assembly is completed, the lowering cable 1300 is installed behind the rotation direction of the arch rib segment 700 and pre-tightened, the length of the lowering cable 1300 is adjustable, one end of which is connected with the lowering cable fixed foundation 200, and the other end is connected with the arch rib segment 700; the wind embracing cable 1400 is installed below the front of the rotation direction of the arch rib segment 700 and pre-tightened, the length of the wind embracing cable 1400 is adjustable, one end of which is connected with the wind embracing cable fixed foundation 500, and the other end is connected with the arch rib segment 700. The pre-tightening of the lowering cable 1300 and the wind embracing cable 1400 can prevent the arch rib segment 700 from leaning backward after being subjected to the longitudinal wind load during the lowering, and increase the stability of the vertical assembly.

[0042] Swivel construction: the lengths of the lowering cable 1300 and the wind embracing cable 1400 are adjusted in coordination to make the lower end of the arch rib segment 700 rotate around the rotatable structure 400, and the upper part rotates downward to reach the designed position, that is, the state shown in the figure 5, after rotating to the designed position, the wind embracing cable 1400 is removed first.

[0043] Subsequent alignment of the arch rib segment can be performed according to the existing technology, if the arch rib segment 700 on the other side has been installed in place, then the welding and fixing of the arch rib segment 700 which has been swiveled to the position and the arch rib segment 700 on the other side need to be completed, and then the connection of the arch rib segment 700 and the arch seat 300 is completed, or the connection of the arch rib segment 700 and the arch seat 300 is completed first, and then the alignment and connection between the arch rib segments 700 on both sides are completed, and finally the lowering cable 1300 is removed.

[0044] Preferably, the top of the lowering cable fixing foundation 200 is provided with a tensioning jack 1000, one end of the lowering cable 1300 is connected to the lowering cable fixing foundation 200 through the tensioning jack 1000; the front anchoring jack 1200 is arranged on the top of the wind cable fixing foundation 500, and one end of the wind cable 1400 is connected to the wind cable fixing foundation 500 through the front anchoring jack 1200. By arranging the jack, the length of the lowering cable 1300 and the wind cable 1400 can be better adjusted.

[0045] Preferably, the embodiment provides a specific structure of the lowering cable fixing foundation 200, which comprises a vertical tower 203, a first pile cap 201 and a first pile foundation 202. The first pile foundation 202 is fixed with the first pile cap 201 at the top, and the first pile cap 201 is fixed with the vertical tower 203 on the top. The vertical tower 203 comprises a column and a crosslink. The column is arranged at least two, which are respectively connected with one of the first pile cap 201, arranged along the width direction of the arch rib, and at least two crosslinks are arranged between the columns. The first pile foundation 202 can adopt four reinforced concrete pile foundations, which are located at the four corners of the bottom of the first pile cap 201 and can be constructed in a conventional way. The first pile cap 201 is provided with a pre-embedded part, which can be connected with the vertical tower 203 to ensure the stability of the vertical tower 203. For the column, a steel pipe structure can be used. The positions of the two columns correspond to the positions of the left and right arch rings of the arch rib segment respectively, and the interval matches the interval between the left and right arch rings, that is, the same or slightly larger or slightly smaller than the interval between the left and right arch rings. The two columns are connected through the crosslink, which makes the vertical tower 203 a whole, and the crosslink can adopt a truss structure.

[0046] Preferably, two groups of first tensioning jacks 1001 and second tensioning jacks 1002 are symmetrically fixed on both sides of the top of the lowering cable fixed foundation 200, and the lowering cable 1300 includes a first lowering cable 1301 and a second lowering cable 1302; one end of the first lowering cable 1301 is connected to one of the two groups of first tensioning jacks 1001, and the other end of the first lowering cable 1301 is connected to the upper part of the arch ring on the same side of the arch rib segment 700; one end of the second lowering cable 1302 is connected to one of the two groups of second tensioning jacks 1002, and the other end of the second lowering cable 1302 is connected to the lower part of the arch ring on the same side of the arch rib segment 700. In this embodiment, the lowering cable fixed foundation 200 includes a vertical tower 203, and one group of first tensioning jacks 1001 and one group of second tensioning jacks 1002 are respectively fixed on the top of each stand. The two groups of tensioning jacks 1000 are symmetrically arranged relative to the vertical center line of the vertical tower 203. In each group of tensioning jacks 1000, one or more than one jack can be included, and the first tensioning jacks 1001 and the second tensioning jacks 1002 can be fixed by anchor boxes, which are welded or bolted to the vertical tower 203. The use of anchor boxes can increase the strength of the tensioning jacks 1000. The connection between the first lowering cable 1301 and the second lowering cable 1302 and the arch ring can also be achieved through an anchor device. The lowering cable 1300 is generally connected to the arch rib top chord 1600 of the arch ring.

[0047] Preferably, a rear anchor device 100 is further arranged at the rear of the lowering cable fixed foundation 200, and the rear anchor device 100 is connected to the top of the lowering cable fixed foundation 200 through an anchoring cable 1500. The rear anchor device 100 can better ensure the stability of the vertical tower 203 during the tensioning process of the lowering cable 1300. During the construction of the lowering cable fixed foundation 200 and the wind cable fixed foundation 500, the construction of the rear anchor device 100 is completed, and the anchoring cable 1500 is connected and pre-tightened between the rear anchor device 100 and the lowering cable fixed foundation 200. There is no strict requirement for the construction sequence of the rear anchor device 100, the arch support 300, the lowering cable fixed foundation 200, and the wind cable fixed foundation 500. They can be performed simultaneously, alternately, or in a certain order, but generally the construction of the rear anchor device 100 is completed before the construction of the vertical tower 203 is completed, to facilitate the installation of the anchoring cable 1500.

[0048] Preferably, the rear anchoring device 100 comprises a second bearing platform 101 and a second pile foundation 102, the second pile foundation 102 is fixed with the second bearing platform 101 at the top; the second bearing platform 101 is provided with at least two, and the top is fixed with the rear anchoring jack 1100, the rear anchoring jack 1100 is connected with one end of the anchoring cable 1500, and the other end of the anchoring cable 1500 is connected with the top of the same side of the wind cable fixing foundation 500. In the embodiment, the second pile foundation 102 adopts two reinforced concrete pile foundations, and the second bearing platform 101 is provided with a pre-embedded part, which is convenient for connecting with the rear anchoring jack 1100. The rear anchoring jack 1100 is generally provided with two groups of rear anchoring jacks 1100, which are respectively connected with the top of the same side of the column. The rear anchoring jack 1100 can be fixed by an anchor box, and the other end of the anchoring cable 1500 can be connected with the wind cable fixing foundation 500 by an anchor.

[0049] Preferably, the wind cable fixing foundation 500 comprises a third bearing platform 501 and a third pile foundation 502, the third pile foundation 502 is fixed with the third bearing platform 501 at the top, the third bearing platform 501 is provided with at least two, and is lower than the connection position of the lowering cable 1300 and the arch rib segment 700. In the embodiment, the arch rib segment 700 on the other side of the arch rib, that is, in the direction shown in FIG. 3, the right arch rib segment 700 has been pre-installed on the arch rib support 900, and the right arch rib segment 700 is basically constructed on land, except that the arch rib segment farthest from the right arch rib support is located above the river, so that the arch rib support 900 corresponding to supporting the arch rib segment needs to be installed in advance, that is, the third bearing platform 501 and the third pile foundation 502 need to be installed in advance, and the third bearing platform 501 and the third pile foundation 502 are used as the wind cable fixing foundation 500 in the embodiment. The front anchoring jack 1200 is arranged on the top of the third bearing platform 501, the front anchoring jack 1200 comprises two groups of first front anchoring jacks 1201 and two groups of second front anchoring jacks 1202, the wind cable 1400 comprises a first wind cable 1401 and a second wind cable 1402, each third bearing platform 501 is fixed with a group of first front anchoring jacks 1201 and a group of second front anchoring jacks 1202 at the top, two groups of first front anchoring jacks 1201 are respectively connected with one end of the first wind cable 1401, the other end of the first wind cable 1401 is respectively connected with the upper part of the arch ring corresponding to the same side of the arch rib segment 700; two groups of second front anchoring jacks 1202 are respectively connected with one end of the second wind cable 1402, and the other end of the second wind cable 1402 is respectively connected with the lower part of the arch ring corresponding to the same side of the arch rib segment 700. By arranging two layers of wind cables 1400, the arch rib can be better prevented from being tilted upward after being subjected to longitudinal wind load during lowering. The wind cable 1400 is generally connected with the lower chord 1800 of the arch rib of the arch ring.

[0050] Preferably, the rotatable structure 400 comprises an upper rotating hinge 402, a lower rotating hinge 401 and a rotating shaft 403, the upper rotating hinge 402 is connected with the lower end of the arch rib segment 700, the lower rotating hinge 401 is connected with the lower end of the arch seat 300, and the upper rotating hinge 402 and the lower rotating hinge 401 are rotatably connected through the rotating shaft 403. In the embodiment, the rotatable structure 400 is provided with two groups, which are respectively arranged at the front and rear of the middle part of the bottom end of the arch rib segment 700 in the direction shown in FIG. 2, i.e. respectively corresponding to the bottom end of the middle part of the left and right arch rings.

[0051] Preferably, during the assembling of the arch rib segment and the rotation body construction, a monitoring system is used to monitor the position and linear type of the arch rib, the monitoring system comprises a 4D laser point cloud acquisition device and a lowering control system, the lowering control system is electrically connected with the 4D laser point cloud acquisition device, the lowering cable 1300 and the cable wind cable 1400, the 4D laser point cloud acquisition device is installed in front of and behind the arch rib segment 700, used to acquire data including the position coordinates and linear type of the arch rib segment, and transmit to the lowering control system, the lowering control system transmits the lowering instruction to control the length and cable force of the lowering cable 1300 and the cable wind cable 1400, so that the installation position and the lowering position of the arch rib segment are controlled within the error range. During the assembling of the arch rib segment 700, the hoisting position of the arch rib segment 700 can be known through the 4D laser point cloud acquisition device, so as to assist in adjusting the hoisting position. During the rotation body construction, according to the feedback of the 4D laser point cloud acquisition device, the lowering control system controls the cable force of the lowering cable 1300 and the cable wind cable 1400 through the control of the tensioning jack 1000 and the front anchoring jack 1200, so as to realize the adjustment of the position of the arch rib segment 700. Of course, in order to facilitate the stable vertical rotation of the tower, the rear anchoring jack 1100 is also connected with the lowering control system, and the cable force of the anchoring cable 1500 can also be controlled through the lowering control system. For the 4D laser point cloud acquisition device, it can be installed on both banks of the river, and the picture acquired by the 4D laser point cloud acquisition device needs to be converted in the coordinate system to obtain the position coordinates of the arch rib segment 700, and the conversion can be realized by using the existing technology.

[0052] Preferably, after the installation of the rotatable structure 400, the temporary fixing structure 600 is installed at the front and rear of the lower end of the arch rib segment 700 closest to the arch base 300 to fix the arch rib segment 700 closest to the arch base 300 together, i.e. on the left and right sides of the bottom end of the arch rib segment 700 in the direction shown in FIG. 2, the arch rib segment 700 is fixed to the arch base 300 by welding steel pipes, of course, the arch base 300 is provided with corresponding embedded parts to connect with the steel pipes. The temporary fixing structure 600 includes rear-end temporary fixing structure 601 and front-end temporary fixing structure 602, the rear-end temporary fixing structure 601 is connected with the arch rib top chord 1600, and the front-end temporary fixing structure 602 is connected with the arch rib bottom chord 1800, before the rotation construction, the temporary fixing structure 600 is removed, i.e. in the state shown in FIG. 4. The embodiment only lists one kind of temporary fixing structure 600 which is convenient to install, and other temporary fixing structures 600 can also be used as long as they can fix the arch rib segment 700.

[0053] In addition, regarding the time node of the installation of the lowering cable 1300 and the cable wind cable 1400, preferably, the lowering cable 1300 and the cable wind cable 1400 are installed after the corresponding connection of the arch rib segment 700, i.e. the connection between the lowering cable 1300 and the arch rib segment 700 and the lowering cable fixing foundation 200, and the connection between the cable wind cable 1400 and the arch rib segment 700 and the cable wind cable fixing foundation 500 are completed, so that the stability of the arch rib segment 700 during the installation process can be better ensured, the construction risk can be reduced, and the deviation of the position of the arch rib segment 700 caused by the influence of the airflow can be reduced. Preferably, when the vertical assembly of the arch rib segment 700 is performed, the construction of the ladder cage 800 is also simultaneously performed for the convenience of the welding between the arch rib segments 700, the ladder cage 800 has stairs to facilitate the climbing of the construction personnel, and the surrounding rail net can prevent the construction personnel from falling. The ladder cage 800 is also assembled segment by segment, and the assembly height matches the assembly height of the arch rib segment 700. After each ladder cage 800 is built, a welding operation platform is installed around the outer periphery of the arch rib segment 700 on one side of the top, so that the welding construction of the next segment of the arch rib segment can be performed on the welding operation platform, after the welding of the next segment of the arch rib segment is completed, the next ladder cage 800 is built and the welding operation platform is installed, and the above operation is repeated until the arch rib segment 700 reaches the design height. Before the rotation construction, the ladder cage 800 and the welding operation platform are removed.

[0054] Based on the above preferred technical solutions and in combination with the geographical environment of the construction application of the embodiment, the specific steps of the embodiment include:

[0055] Construction of the lowering cable fixed foundation 200, the wind embracing cable fixed foundation 500 and the rear anchoring device 100: in combination with the figure 1, the construction of the lowering cable fixed foundation 200 and the rear anchoring device 100 is completed in advance behind the abutment 300, and the construction of the wind embracing cable fixed foundation 500 is completed in front of the abutment 300; in this embodiment, the wind embracing cable fixed foundation 500 directly utilizes the third bearing platform 501 below the arch rib support 900 of the arch rib segment 700 on the other side closest to the lowering cable fixed foundation 200, which can save construction cost; there is no strict requirement for the construction sequence of the abutment 300, the lowering cable fixed foundation 200, the wind embracing cable fixed foundation 500 and the rear anchoring device 100, which can be performed simultaneously, alternately or in a certain sequence, as long as it is completed before the next step. The tensioning jack 1000, the front anchoring jack 1200 and the rear anchoring jack 1100 are respectively installed on the top of the lowering cable fixed foundation 200, the wind embracing cable fixed foundation 500 and the rear anchoring device 100, and the anchoring cable 1500 is connected between the top of the rear anchoring jack 1100 and the lowering cable fixed foundation 200 and pre-tightened.

[0056] Assembling the arch rib segment 700 and installing the lowering cable 1300 and the wind embracing cable 1400: as shown in the figure 2, the rotatable structure 400 is installed at the lower end of the arch rib segment 700 closest to the abutment 300 and connected with the abutment 300, and the embedded part is provided in the abutment 300 and connected with the lower rotating hinge 401, the upper rotating hinge 402 is welded at the lower end of the arch rib segment 700 closest to the abutment 300 and connected with the lower rotating hinge 401 through the rotating shaft 403, and the temporary fixing structure 600 is also welded at the lower end of the arch rib segment 700 closest to the abutment 300 and connected with the embedded part in the abutment 300, so that the arch rib segment 700 closest to the abutment 300 is fixed; then the large crane is used to vertically assemble the arch rib segment 700 of one side of the arch rib in sequence until the designed length is reached, i.e. the state shown in the figure 3, and the adjacent arch rib segments 700 are connected by welding; in the process of vertical assembly or after the vertical assembly is completed, the lowering cable 1300 is installed behind the rotating direction of the arch rib segment 700 and pre-tightened, the length of the lowering cable 1300 is adjustable, one end of which is connected with the tensioning jack 1000 and the other end is connected with the arch rib segment 700; the wind embracing cable 1400 is installed below the front of the rotating direction of the arch rib segment 700 and pre-tightened, one end of which is connected with the front anchoring jack 1200 and the other end is connected with the arch rib segment 700.

[0057] Swivel construction: as shown in Figure 4, the temporary fixing structure 600 is removed, the length of the lowering cable 1300 and the wind cable 1400 is adjusted by coordinating the tensioning of the jack 1000 and the front anchoring jack 1200, so that the lower end of the arch rib segment 700 rotates around the rotatable structure 400, and the upper part rotates downward to reach the designed position, that is, the state shown in Figure 5. After rotating to the designed position, the wind cable 1400 is removed first. The subsequent alignment of the arch rib segment can be carried out according to the prior art. In the present embodiment, the welding and fixing of the arch rib segment 700 on the other side is required to be completed, and then the welding and fixing of the arch rib segment 700 that has rotated to the position and the arch rib segment 700 on the other side is required to be completed, and then the connection of the arch rib segment 700 and the arch base 300 is completed, or the connection of the arch rib segment 700 that has rotated to the position and the arch base 300 is completed, and then the alignment and connection between the arch rib segments 700 on the two sides are completed, and finally the lowering cable 1300 is removed.

[0058] Embodiment 2

[0059] At the moment when the arch rib vertical rotation and lowering release the temporary fixing structure and the connection support of the arch rib, a large instantaneous force will be generated, so that the lowering cable 1300 and the vertical rotation tower 203 are suddenly stressed, and then the cable force of the lowering system cannot be controlled, which may cause the phenomenon of instantaneous instability of the arch rib. In order to solve the above-mentioned possible problems, in combination with Figure 6, the present embodiment increases the force relieving device on the basis of Embodiment 1. Before the temporary fixing structure is removed, the force relieving device is installed below and on the side of the arch rib. Specifically:

[0060] The force relieving device comprises a counter-jacking mechanism 1700 and a jacking mechanism 1900. The counter-jacking mechanism 1700 comprises a rigid support structure, one end of which is adapted to match the outer side of the temporary anchoring position of the bottom of the arch rib upper chord 1600, and the other end is fixed on the arch seat. The counter-jacking mechanism 1700 forms a rigid support for the arch rib upper chord 1600 by means of the counter-force of the arch seat 3, thereby preventing the arch rib upper chord 1600 from tilting backward. The jacking mechanism 1900 comprises an upper sealing plate 1901, a lower sealing plate 1903 and a jacking jack group 1902. The upper sealing plate 1901 is used to match and fixedly connect with the bottom surface of the arch rib lower chord 1800, the lower sealing plate 1903 is used to match and fixedly connect with the top surface of the temporary fixing structure which is temporarily anchored under the arch rib lower chord 1800 and has been cut and separated, and the jacking jack group 1902 is fixed between the upper sealing plate 1901 and the lower sealing plate 1903. In addition, it should be noted that when the connection between the arch rib lower chord 1800 and the temporary fixing structure is released, the temporary fixing structure is generally cut to a certain length, so that the arch rib lower chord 1800 is kept a certain distance from the temporary fixing structure. When the connection between the first arch rib lower chord 1800 and the temporary fixing structure is released, the position of the arch rib is kept unchanged by the connection between the other arch rib lower chords 1800 and the temporary fixing structure, thereby ensuring the safety of the installation of the jacking mechanism 1900. When the connection between the last arch rib lower chord 1800 and the temporary fixing structure is released, the safety of the installation of the last jacking mechanism 1900 is ensured by the support of the temporary fixing structure and the jacking mechanism 1900 on the other arch rib lower chords 1800.

[0061] Before the temporary fixing structure is released, the rigid support structure is fixed on the outer side of the arch rib upper chord 1600, the top of which is closely attached to the outer side of the arch rib upper chord 1600, and then the rear-end temporary fixing structure 601 connected with the arch rib upper chord 1600 is released. In the next step, the connection between the arch rib lower chord 1800 and the front-end temporary fixing structure 602 is released. After the connection between each arch rib lower chord 1800 and the rear-end temporary fixing structure 601 is released, the upper sealing plate 1901 and the lower sealing plate 1903 are respectively welded to the bottom of the arch rib lower chord 1800 and the top surface of the temporary fixing structure which has been cut and separated, and the jacking jack group 1902 is jacked to the corresponding height. The arch rib lower chord 1800 is supported by the jacking jack group 1902. When the connection between all the arch rib lower chords 1800 and the front-end temporary fixing structure 602 is released and the jacking device is installed, the connection between the temporary fixing structure and the arch rib segment 700 is completely released. The jacking height of the jacking jack group 1902 is adjusted to coordinate with the lowering cable and the wind cable 1400 to control the slow lowering of the arch rib.

[0062] For the force relieving device, the embodiment further optimizes. The embodiment provides a specific structure of the rigid support structure, which includes a wedge-shaped pad shaped to better fit the arch seat 3 and the arch rib top chord 1600, and supports the arch rib top chord 1600; the wedge-shaped pad includes a plurality of spaced-apart rigid support plates 1702 arranged along the width direction of the arch rib to support the arch rib top chord 1600 with a certain width, one end of each rigid support plate 1702 is matched to support the outer side of the arch rib top chord 1600 at the temporary anchoring position at the bottom end, and the other end is fixed to the arch seat 3; the number of wedge-shaped pads is generally matched with the number of arch rib top chords 1600, that is, each arch rib top chord 1600 is matched with one wedge-shaped pad for support. More preferably, to ensure the support force of the arch rib top chord 1600, the rigid support plate 1702 is made of a steel plate with a thickness of not less than 20 mm.

[0063] For the installation of the rigid support plate 1702, a pre-embedded steel plate 1701 is preferably provided, which is pre-embedded in the arch seat 3 during pouring of the arch seat 3, and the other end of the rigid support plate 1702 is connected to the top of the arch seat 3. The connection is generally by welding, which is convenient and fast.

[0064] In addition, the counter-jacking mechanism can also include a backup steel plate 1703, which is fixed to the bottom surface of the arch rib top chord 1600 or the top surface of the corresponding temporary fixing structure after the arch rib top chord 1600 is disconnected from the temporary fixing structure. The temporary fixing structure here refers to the temporary fixing structure connected below the arch rib top chord 1600, and generally one arch rib top chord 1600 is provided with one backup steel plate 1703. The disconnection is generally by cutting, which leaves a certain space between the arch rib top chord 1600 and the temporary fixing structure after cutting, and the backup steel plate 1703 is welded to increase the contact area so that the temporary fixing structure still supports the arch rib top chord 1600. After the installation of other parts of the force relieving device is completed and before the arch rib is rotated, the backup steel plate 1703 is removed so that the arch rib top chord 1600 is not affected by the backup steel plate 1703 during rotation.

[0065] Preferably, the jacking mechanism 1900 is provided with at least two, which is matched with the number of arch rib bottom chords 1800, that is, each arch rib bottom chord 1800 is matched with one jacking mechanism 1900. If there are four arch rib bottom chords 1800, four jacking mechanisms 1900 are matched and installed.

[0066] Preferably, as shown in FIG. 2, in the jacking mechanism 1900, the jacking jack group 1902 includes at least two jacks arranged in the direction of the arch rib bottom chord 1800 after the temporary anchoring is released, so as to more balancedly support the arch rib bottom chord 1800 and achieve the purpose of slowly releasing the arch rib bottom chord 1800.

[0067] Preferably, the jacking mechanism 1900 further comprises a remote control system, which is electrically connected with the jacking jack group 1902, through which the jacking and lowering of the jacks can be conveniently controlled to ensure the safety of construction.

[0068] Preferably, since the jacking mechanism 1900 needs to bear a large load, the thickness of the upper sealing plate 1901 and the lower sealing plate 1903 is preferably not less than 25 mm, and in this embodiment, a steel plate with a thickness of 30 mm is selected.

[0069] For the above more preferred technical solution, this embodiment further provides a more specific operation method: the pre-embedded steel plate 1701 is installed in advance before pouring the abutment 3, and the rigid support structure is welded to the pre-embedded steel plate 1701 before the temporary fixing structure 600 is removed, so that the top thereof is tightly fitted with the outer side surface of the arch rib upper chord 1600. One counter-jacking mechanism 1700 is installed corresponding to each arch rib upper chord 1600 to provide a counterforce to the arch rib to prevent the arch rib from leaning backward at the moment when the temporary fixing structure is removed. In addition, after the connection between the rear-end temporary fixing structure 601 and the arch rib upper chord 1600 is removed, a piece of steel plate 1703 is welded to the bottom surface of the arch rib upper chord 1600 or the top surface of the corresponding rear-end temporary fixing structure 601. After the counter-jacking mechanism 1700 is installed, the jacking mechanism 1900 is installed. After the connection between each arch rib lower chord 1800 and the front-end temporary fixing structure 602 is removed, the upper sealing plate 1901 and the lower sealing plate 1903 are welded to the bottom of the arch rib lower chord 1800 and the top surface of the front-end temporary fixing structure 602 that has been cut and separated, respectively. The jacking jack group 1902 is jacked to the corresponding height, the arch rib lower chord 1800 is supported by the jacking jack group 1902, and after the connection between all the arch rib lower chords 1800 and the temporary fixing structure is removed and the jacking device is installed, the connection between the temporary fixing structure and the arch rib segment 700 is completely removed. The steel plate 1703 is removed, the jacking jack group 1902 of the four chords is synchronously unloaded by remote control, and the height is lowered in cooperation with the lowering cable 1300 and the cable wind cable 1400, thereby achieving the purpose of slowly releasing the arch rib.

[0070] The counter-jacking mechanism 1700 is used to prevent the arch rib from leaning backward, and the jacking mechanism 1900 is used to keep the arch rib balanced and coordinate the slow lowering of the arch rib, which can help reduce the probability of instantaneous instability of the arch rib when the connection and support between the temporary fixing structure and the arch rib are removed.

Claims

1. A method for erecting and rotating a ribbed arch vertically, characterized in that The method comprises the following steps: Construction of the lowering cable fixed foundation and the wind embracing cable fixed foundation: the construction of the lowering cable fixed foundation is completed in the rear of the abutment, and the construction of the wind embracing cable fixed foundation is completed in the front of the abutment; Assembling the arch rib segments and installing the lowering cable and the wind embracing cable: a rotatable structure is installed at the lower end of the arch rib segment closest to the abutment, and then the arch rib segments on one side of the arch rib are vertically assembled upwards one by one until the designed length is reached; in the process of vertical assembly or after the vertical assembly is completed, the lowering cable is installed and pre-tightened behind the rotating direction of the arch rib segment, the length of the lowering cable is adjustable, one end of the lowering cable is connected with the lowering cable fixed foundation, and the other end of the lowering cable is connected with the arch rib segment; the wind embracing cable is installed and pre-tightened below the front of the rotating direction of the arch rib segment, the length of the wind embracing cable is adjustable, one end of the wind embracing cable is connected with the wind embracing cable fixed foundation, and the other end of the wind embracing cable is connected with the arch rib segment; Swivel construction: the lengths of the lowering cable and the wind embracing cable are adjusted to make the lower end of the arch rib segment rotate around the rotatable structure and the upper part rotate downwards to the designed position.

2. The method according to claim 1, characterized in that: the top of the lowering cable fixed foundation is provided with a tensioning jack, and one end of the lowering cable is connected with the lowering cable fixed foundation through the tensioning jack; the upper surface of the wind embracing cable fixed foundation is provided with a front anchoring jack, and one end of the wind embracing cable is connected with the wind embracing cable fixed foundation through the front anchoring jack.

3. The method according to claim 1, characterized in that: the lowering cable fixed foundation comprises a vertical tower, a first pile foundation and a first pile cap, the first pile cap is fixed on the top of the first pile foundation, the first pile cap is provided with at least two, and the vertical tower is fixed on the upper surface of the first pile cap, the vertical tower comprises a stand column and a cross connection, the stand column is provided with at least two, and each of the stand columns is connected with one of the first pile caps, the stand columns are arranged along the width direction of the arch rib, and at least two cross connections are arranged between the adjacent stand columns.

4. The method according to any one of claims 1-3, characterized in that: two groups of first tensioning jacks and second tensioning jacks are symmetrically fixed on the top of the lowering cable fixed foundation, the lowering cable comprises a first lowering cable and a second lowering cable, one end of each of the first tensioning jacks is connected with one end of the first lowering cable, the other end of the first lowering cable is connected with the upper part of the arch ring on the same side of the arch rib segment, one end of each of the second tensioning jacks is connected with one end of the second lowering cable, and the other end of the second lowering cable is connected with the lower part of the arch ring on the same side of the arch rib segment.

5. The method according to any one of claims 1-3, characterized in that: the lowering cable fixed foundation is further provided with a rear anchoring device behind the lowering cable fixed foundation, and the rear anchoring device is connected with the top of the lowering cable fixed foundation through an anchoring cable; when the lowering cable fixed foundation and the wind embracing cable fixed foundation are constructed, the construction of the rear anchoring device is completed, and the anchoring cable is connected between the rear anchoring device and the lowering cable fixed foundation and is pre-tightened.

6. The method of claim 5, wherein the rear anchoring device comprises a second pile foundation and a second bearing platform, the second pile foundation has the second bearing platform fixed on the top of the second pile foundation, and the second bearing platform is provided with at least two second bearing platforms, and the top of each second bearing platform is fixed with a rear anchoring jack, one end of the rear anchoring jack is connected with the anchoring cable, and the other end of the anchoring cable is connected with the top of the same side of the wind cable fixing foundation.

7. The method of claim 4, wherein the wind cable fixing foundation comprises a third pile foundation and a third bearing platform, the third pile foundation has the third bearing platform fixed on the top of the third pile foundation, and the third bearing platform is provided with at least two third bearing platforms, and the third bearing platform is lower than the connecting position of the lowering cable and the arch rib segment.

8. The method of claim 1, wherein during the assembling of the arch rib segment and the rotation construction, a monitoring system is used to monitor the position and linear type of the arch rib, the monitoring system comprises a 4D laser point cloud acquisition device and a lowering control system, the lowering control system is electrically connected with the 4D laser point cloud acquisition device, the lowering cable and the wind cable, the 4D laser point cloud acquisition device is installed in front of and behind the arch rib segment, is used to acquire data including the position coordinates and linear type of the arch rib segment, and transmits the data to the lowering control system, the lowering control system controls the length and cable force of the lowering cable and the wind cable, so that the installation position and the lowering position of the arch rib segment are controlled within an error range.

9. The method of claim 1, wherein after the rotatable structure is installed, temporary fixing structures are installed in front of and behind the lower end of the arch rib segment closest to the arch seat, so that the arch rib segment closest to the arch seat is fixed with the arch seat; and before the rotation construction, the temporary fixing structures are removed.

10. The method of claim 9, wherein ​ ​ ​ ​ ​ ​ The force relieving device is installed under and beside the arch rib before the temporary fixing structure is removed; the force relieving device comprises a reverse jacking mechanism and a jacking mechanism, the reverse jacking mechanism comprises a rigid support structure, one end of the rigid support structure is matched with the outer side of the arch rib, and the other end of the rigid support structure is fixed on the arch base, the jacking mechanism comprises an upper sealing plate, a lower sealing plate and a jacking jack group, the upper sealing plate is used for matching and fixedly connected with the bottom surface of the lower chord of the arch rib, the lower sealing plate is used for matching and fixedly connected with the top surface of the temporary fixing structure which is temporarily anchored under the lower chord of the arch rib and is cut off, and the jacking jack group is fixed between the upper sealing plate and the lower sealing plate; Before the temporary fixing structure is removed, the rigid support structure is fixed on the outer side of the upper chord of the arch rib, and the top of the rigid support structure is tightly matched with the outer side of the upper chord of the arch rib; after the connection between one lower chord of the arch rib and the temporary fixing structure is removed, the upper sealing plate and the lower sealing plate are respectively welded to the bottom surface of the lower chord of the arch rib and the top surface of the temporary fixing structure which is cut off, the jacking jack group is placed and jacked to a corresponding height, the lower chord of the arch rib is supported by the jacking jack group, after the connection between all the lower chords of the arch rib and the temporary fixing structure is removed and the jacking device is installed, the jacking height of the jacking jack group is adjusted, and the jacking height is matched with the lowering cable and the wind cable to coordinately control the slow lowering of the arch rib.

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