Construction method of half-through type steel box basket arch bridge

Abstract

The invention discloses a construction method of a half-through type steel box basket arch bridge. The construction method comprises the following steps that a cable-stayed buckle cable system is installed and adjusted, and a floating crane enters a site; hoisting the arch rib by using a floating crane, transporting the arch rib to a mounting position, and mounting the arch rib by hanging a buckle cable and a back cable; sequentially installing the arch ribs according to the steps until the arch ribs are closed; before the arch ribs are closed, the steel box girders outside the arch rings are hoisted and transported through a floating crane, and the steel box girders are installed outside the arch rings after being transported in place; hoisting the steel box girder in the arch ring by adopting a floating crane, and installing the steel box girder after the steel box girder is transported in place; and other steel box girders in the arch ring are sequentially installed according to the steps till the steel box girders are closed. According to the construction method of the half-through steel box basket arch bridge, the requirement for the strength of the tower is not high, the cost of the floating crane is low, the floating crane can be recycled, and the construction cost of the arch bridge can be reduced. The construction method of first arching and second beam is not completely adopted, the hoisting and installation space of the steel box beam is enough, and installation of the steel box beam outside the arch ring cannot be affected.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a construction method of a mid-span steel box basket arch bridge. Background Art

[0002] An arch bridge is a bridge that uses an arch as the main load-bearing structural member in a vertical plane. The vertical load is transmitted to the arch abutment through the curved arch. Arch bridges can be divided into top-bearing arch bridges, mid-bearing arch bridges and bottom-bearing arch bridges, mainly based on the location of the lanes. When the bridge deck is located on the upper part of the superstructure, it is called a top-bearing arch bridge; when the bridge deck is located in the middle of the superstructure, it is called a mid-bearing arch bridge; when the bridge deck is located below the upper bridge, it is called a bottom-bearing arch bridge. Arch bridges can be built with materials with good compressive properties such as bricks, stones, and concrete; span arch bridges are built with reinforced concrete or steel to withstand the torque that occurs.

[0003] For mid-span steel box basket arch bridges, the process of erecting the arch first and then the beam is generally adopted. The left and right arch ribs are hoisted separately, of which the first arch rib needs to be installed on the arch seat first, and then the subsequent arch rib segments are hoisted in sequence, and finally the steel box girder is hoisted. At present, the mid-span steel box basket arch bridge is generally constructed by cable hoisting and inclined stay buckle hanging. First, towers are erected on both sides of the river channel, and then cables are installed on the towers and lifting trolleys are installed on the cables to form a cable crane. The cable crane hoists the arch ribs and cooperates with the tower to install the arch ribs. After the arch ribs are installed, the inclined stay buckle is removed, and then the steel box girder is hoisted by cable crane, and the hanger connection is tensioned to complete the installation of the steel box girder.

[0004] However, for the construction method of the traditional mid-span steel box basket arch bridge, since the arch ribs and steel box girders are hoisted by cables, during the arch rib installation process, the tower frame not only needs to bear the tension of the arch rib inclined buckle hanging, but also needs to bear the force of the cable hoist and the arch rib hoisting. Therefore, the strength requirements of the tower frame are relatively high, and the tower frame needs to have a large enough cross-section and connect enough anchors to meet the requirements, resulting in high costs. At the same time, since the arch ribs of the basket arch bridge gradually decrease in width from both ends to the middle of the bridge, the hoisting of the steel box girder from the middle of the river channel to the outside of the arch ring is affected after the arch ribs are closed, which affects the subsequent hoisting of the steel box girder. Summary of the invention

[0005] Based on this, it is necessary to provide a construction method for a mid-span steel box basket arch bridge in response to the construction method of the traditional mid-span steel box basket arch bridge, the high cost of the tower, and the problem of affecting the subsequent lifting of the steel box girder after the arch rib is closed.

[0006] A construction method for a mid-span steel box basket arch bridge comprises the following steps:

[0007] Installation and adjustment of the cable stay system and the floating crane entering the site;

[0008] The arch rib is lifted by the floating crane, transported to the installation location, and then the buckle cable and the back cable are hung to install the arch rib, and the arch rib is installed symmetrically to the bridge axis;

[0009] The arch ribs are installed in sequence according to the above steps until the arch ribs are closed; and before the arch ribs are closed, the steel box girder outside the arch ring is lifted and transported by the floating crane, and the steel box girder is transported to the place and then installed outside the arch ring;

[0010] The steel box girder in the arch ring is lifted by floating crane, and after being transported to the place, the steel box girder is installed, and the steel box girder installation of the symmetrical bridge axis is completed;

[0011] Follow the above steps to install other steel box girders in the arch ring in sequence until the steel box girders are connected.

[0012] In one embodiment, the steps of installing and adjusting the cable stay system and bringing the floating crane into the site also include:

[0013] The arch seat is constructed and the arch seat foundation pit is backfilled. Then the transition pier and cap beam are constructed on the arch seat. The first section of the arch rib and the tower foundation are embedded. The arch seat is cast.

[0014] Conduct arch rib anchor tensioning and pour epoxy mortar;

[0015] The site was cleaned and the back cable anchor system, tower cable wind anchor, arch rib anchor and floating shore anchor were constructed.

[0016] In one embodiment, the steps of installing and adjusting the inclined cable system are specifically as follows:

[0017] The tower is assembled and the cross braces are connected on the tower foundation, the tower wind cables are hung, the tower access, platform and anchor beams are constructed, and finally the tower is adjusted and accepted.

[0018] In one embodiment, the steps of using the floating crane to lift the arch rib, transporting it to the installation location, and then hanging the buckle rope and the back rope to install the arch rib are specifically as follows:

[0019] Move the floating crane to turn over the arch rib, then lift the arch rib with the floating crane and transport it longitudinally to the installation location;

[0020] After the arch rib is matched and positioned, it is connected with the high bolt of the previous arch rib, and the buckle cable and back cable are hung;

[0021] After fine-tuning the linear shape, tension the anchor cables, loosen the hooks by floating, and weld the rear end of the arch rib.

[0022] In one of the embodiments, after the third section of the arch rib is installed, the steel box girder outside the arch ring is installed.

[0023] In one embodiment, the steps of using the floating crane to lift and transport the steel box girder outside the arch ring, and installing the steel box girder outside the arch ring after transporting it to the location are specifically as follows:

[0024] The floating crane uses a shoulder pole sling to hoist the steel box girder outside the arch ring as a whole. The steel box girder is matched, positioned and temporarily reinforced, and finally installed on the transition pier, cap beam and arch rib.

[0025] In one embodiment, before the step of installing the steel box girder in the arch ring, the step further includes:

[0026] Remove the cable-stayed system and the back cables and cables of the arch ribs.

[0027] In one embodiment, the steps of removing the inclined cable system and removing the back cables and the cable of the arch rib are specifically as follows:

[0028] The buckle cables and back cables are unloaded and removed symmetrically in stages;

[0029] Remove the tower frame, tower cable and arch rib cable;

[0030] The back-rope ground anchor and tower cable wind anchor are removed.

[0031] In one embodiment, the steps of using floating hoist to lift the steel box girder in the arch ring and installing the steel box girder after transporting it to the location are specifically as follows:

[0032] The steel box girder in the arch ring is hoisted by floating crane. After being transported to the place, it is positioned by matching with horse plates and temporarily reinforced with cable wind.

[0033] The suspenders are connected, and then the first stage suspenders are tensioned, the line shape is observed and adjusted, and the second stage tensioning is carried out;

[0034] Weld around the previous section of steel box girder and loosen the hook by floating hoist.

[0035] In one embodiment, the steps of closing the steel box girder are specifically as follows:

[0036] According to the monitoring data, observe and collect meteorological data, observe the temperature deformation of the steel box girder, make line adjustments and suspender cable tension adjustments, and obtain closure instructions from third-party monitoring;

[0037] According to the measured joint section data, the steel box girder of the joint section is cut and assembled on the transport ship;

[0038] The floating crane hoists the steel box girder of the joint section, matches and positions it, makes fine adjustments to the line shape, and welds the steel box girder of the joint section;

[0039] Remove the wind cables connected to the steel box girder and install the damper.

[0040] The construction method of the above-mentioned mid-span steel box basket arch bridge has at least the following advantages:

[0041] The arch ribs and steel box girders are hoisted by floating cranes, so the tower frame only needs to bear the tension of the arch rib inclined buckle hanging, and does not need to bear the force of the cable crane and the hoisted objects. The strength requirements of the tower frame are not high, and there is no need to set up a large-section tower frame and a large number and depth of anchors. The cost of the floating crane itself is low and can be used in a turnover manner, which can reduce the construction cost of the arch bridge. At the same time, before the arch ribs are closed, the steel box girder outside the arch ring is installed. The construction method of arch first and then beam is not completely adopted. The hoisting and installation space of the steel box girder is sufficient, which will not affect the installation of the steel box girder outside the arch ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0043] Figure 1 A flow chart of a construction method of a mid-span steel box basket arch bridge in one embodiment;

[0044] Figure 2 This is the elevation drawing of the floating crane + inclined hook lifting scheme;

[0045] Figure 3 This is the plan view of the floating crane + inclined hook lifting scheme;

[0046] Figure 4 Draw a schematic diagram of the foundation for construction;

[0047] Figure 5 This is a schematic diagram of the installation of the inclined cable system;

[0048] Figure 6 This is a schematic diagram of the installation of the second arch rib;

[0049] Figure 7 This is a schematic diagram of the installation of the third arch rib;

[0050] Figure 8 This is a schematic diagram of the construction of the outer steel box girder of the arch ring;

[0051] Fig. 9 This is a schematic diagram of the construction of arch ribs 4-12;

[0052] Fig.10 The schematic diagram of the arch rib closure is shown in FIG.

[0053] Fig.11 This is a schematic diagram of the cable-stayed system after removal;

[0054] Fig.12 This is a schematic diagram of the construction of the second section of steel box girder;

[0055] Fig.13This is a schematic diagram of the construction of the third section of steel box girder;

[0056] Fig.14 This is a schematic diagram of the remaining steel box girders for construction;

[0057] Fig.15 This is a schematic diagram of the steel box girder closure.

[0058] Reference numerals:

[0059] 10-arch seat, 11-transition pier, 12-back cable anchor system, 13-tower cable wind ground anchor, 14-arch rib ground anchor, 15-floating crane shore anchor, 20-arch rib, 21-bracket, 22-back cable, 23-cable buckle, 24-permanent cross brace, 25-arch rib cable wind, 30-tower, 31-cable tower cable wind, 40-floating crane, 41-floating crane cable wind, 50-steel box girder, 60-suspender rod. DETAILED DESCRIPTION

[0060] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the invention is not limited by the specific implementation disclosed below.

[0061] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0063] See also Figure 1 The construction method of a mid-through steel box basket arch bridge in one embodiment comprises the following steps:

[0064] Step S110: The cable-stayed cable system is installed and adjusted, and the floating crane 40 enters the site.

[0065] Please also read Figures 2 to 4Specifically, before installing the cable-stayed cable system, preparations need to be made. In one embodiment, an arch seat 10 is constructed on both sides of the river channel, and the foundation pit of the arch seat 10 is backfilled. The transition pier 11 and the cap beam are constructed, and then the first section of the arch rib 20 is installed on the arch seat 10. The lower part of the first section of the arch rib 20 is supported by a bracket 21, and the tower foundation is pre-buried in the arch seat 10, and the arch seat 10 is cast.

[0066] Next, the anchor bars of the first arch rib 20 are tensioned and epoxy mortar is poured to fix the arch rib 20. Finally, the site is cleaned and the back cable anchor system 12, tower cable wind anchor 13, arch rib anchor 14 and floating shore anchor 15 are constructed. In this solution, the arch rib anchor 14 and the floating shore anchor 15 share one anchor.

[0067] Please also read Figure 5 After the construction of the arch seat 10 is completed, the tower crane is installed to assist the installation of the inclined cable system. The tower 30 is assembled by the tower crane, and the cross brace is connected during the assembly of the tower 30. After the construction of the tower 30 is completed, the tower 30 cable is hung, and the tower cable 31 is used to connect the tower 30 and the tower cable anchor 13. The tower 30 access channel, platform, and anchor beam are constructed, and finally the tower 30 is adjusted and accepted.

[0068] The floating crane 40 is arranged in the river channel, and the floating crane 40 can sail in the river channel. The power of the floating crane 40 can be its own power system, or it can be towed by external power to sail. The floating crane 40 can be connected to the floating crane shore anchor 15 by a floating crane cable 41 to realize the shore side positioning of the floating crane 40.

[0069] Step S120: The arch rib 20 is hoisted by the floating crane 40, and after being transported to the installation location, the buckle cable 23 and the back cable 22 are used to install the arch rib 20, and the installation of the arch rib 20 symmetrical to the bridge axis is completed.

[0070] Please also read Figure 6 Specifically, the floating crane 40 hoists the second arch rib 20 upstream, transports it to the installation location, matches and positions it, and then connects the arch rib 20 to the previous arch rib 20 (i.e., the first arch rib 20) with a high bolt. Hang the back cable 22 and the buckle cable 23, that is, connect the arch rib 20 and the tower 30 at both ends of the buckle cable 23, respectively, connect the tower 30 and the back cable anchor system 12 at both ends of the back cable 22, and the connection points of the back cable 22 and the buckle cable 23 on the tower 30 are at the same height. Then, fine-tune the line shape and tension the anchor buckle cable 23, release the hook of the floating crane 40, and weld the rear end of the arch rib 20 to the first arch rib 20. Finally, the floating crane 40 hoists and welds the temporary crossbeam at the front end of the second arch rib 20.

[0071] Complete the installation of the arch rib 20 symmetrical to the axis of the bridge. Specifically, the floating crane 40 hoists the second arch rib 20 downstream, transports it to the installation location, matches and positions it, and then connects this arch rib 20 with the previous arch rib 20 (i.e., the first arch rib 20) by high bolts. Hang the back cable 22 and the buckle cable 23, that is, connect the two ends of the buckle cable 23 to the arch rib 20 and the tower 30 respectively, and connect the two ends of the back cable 22 to the tower 30 and the back cable anchor system 12 respectively. The connection points of the back cable 22 and the buckle cable 23 on the tower 30 are at the same height. Then, fine-tune the line shape and tension the anchor buckle cable 23, release the hook of the floating crane 40, and weld the rear end of the arch rib 20 to the first arch rib 20. Finally, the floating crane 40 hoists and welds the temporary crossbeam at the front end of the second arch rib 20.

[0072] Step S130: installing the arch ribs 20 in sequence according to the above steps until the arch ribs 20 are connected, and before the arch ribs 20 are connected, using the floating crane 40 to lift and transport the steel box girder 50 outside the arch ring, and installing the steel box girder 50 outside the arch ring after transporting it to the right place.

[0073] Please also read Figure 7 Specifically, the floating crane 40 hoists the third arch rib 20 upstream, transports it to the installation location, matches and positions it, and then connects the arch rib 20 to the previous arch rib 20 (i.e., the second arch rib 20) with a high bolt. Hang the back cable 22 and the buckle cable 23, that is, connect the arch rib 20 and the tower 30 at both ends of the buckle cable 23, respectively, connect the tower 30 and the back cable anchor system 12 at both ends of the back cable 22, and the connection points of the back cable 22 and the buckle cable 23 on the tower 30 are at the same height. Then, fine-tune the line type and tension the anchor buckle cable 23, release the hook of the floating crane 40, and weld the rear end of the arch rib 20 to the second arch rib 20. Finally, the floating crane 40 hoists and welds the permanent cross brace 24 of the third arch rib 20, and installs the support.

[0074] The floating crane 40 hoists the third arch rib 20 downstream, transports it to the installation location, matches and positions it, and then connects this arch rib 20 to the previous arch rib 20 (i.e., the second arch rib 20) with a high bolt. Hang the back cable 22 and the buckle cable 23, that is, connect the two ends of the buckle cable 23 to the arch rib 20 and the tower 30 respectively, and connect the two ends of the back cable 22 to the tower 30 and the back cable anchor system 12 respectively. The connection points of the back cable 22 and the buckle cable 23 on the tower 30 are at the same height. Then, fine-tune the line shape and tension the anchor buckle cable 23, and the floating crane 40 releases the hook, and welds the rear end of this arch rib 20 to the second arch rib 20. Finally, the floating crane 40 hoists and welds the permanent cross brace 24 of the third arch rib 20, and installs the support.

[0075] Please also read Figure 8After the third section of the arch rib 20 is installed, the steel box girder 50 outside the arch ring is installed. Since the width of the arch rib 20 of the basket arch bridge gradually decreases from the two ends to the middle of the bridge, the steel box girder 50 outside the arch ring is installed after the third section of the arch rib 20 is installed, and the arch rib 20 still has enough space for installing the steel box girder 50. Specifically, the steps of installing the steel box girder 50 outside the arch ring are as follows:

[0076] The steel box girder 50 on the west bank arch ring is hoisted as a whole by a pole hoist. The length of the steel box girder 50 is 21m. After the steel box girder 50 is matched and positioned and temporarily reinforced, it is installed on the transition pier 11, the cap beam and the arch rib 20, and the transition pier 11 is counterweighted. The steel box girder 50 on the east bank arch ring is hoisted by a pole hoist. After the steel box girder 50 is matched and positioned and temporarily reinforced, it is installed on the transition pier 11, the cap beam and the arch rib 20, and the transition pier 11 is counterweighted.

[0077] Please also read Fig. 9 Then, according to the above-mentioned installation method of the arch rib 20, continue to install the 4th to 12th sections of the upstream arch rib 20, and correspondingly install the 4th to 12th sections of the downstream arch rib 20, and finally close the arch rib 20.

[0078] Please also read Fig.10 The specific process of the joint closure is as follows: (1) According to the monitoring data, check and adjust the cable tension, observe the weather, observe the temperature deformation of the arch rib 20, adjust the joint line of the arch rib 20, and obtain the joint closure instruction from the third-party monitoring; (2) According to the measured joint section data, the joint section arch rib 20 is equipped on the transport ship; (3) The floating crane 40 hoists the upstream joint section arch rib 20 and the downstream joint section arch rib 20 in turn, matches the positioning, high bolt connection, and circumference welding, and the joint closure is completed.

[0079] Please also read Fig.11 After the joint is completed, the cable-stayed cable system is dismantled, and the back cables 22 and cable 23 are dismantled. Specifically, the dismantling process is as follows: the cable 23 and the back cables 22 are unloaded and dismantled in stages and symmetrically; the tower frame 30 and the tower cable wind 31 are dismantled, and the arch rib cable wind 25 is dismantled; the tower crane and its attachments are dismantled; and the back cable anchor system 12 and the tower cable wind anchor 13 are dismantled.

[0080] Step S140: Use the floating crane 40 to lift the steel box girder 50 in the arch ring, transport it to the location, and then carry out the casework of the steel box girder 50 , and complete the installation of the steel box girder 50 symmetrical to the bridge axis.

[0081] Please also read Fig.12Specifically, the floating crane 40 uses a shoulder pole sling to lift the first steel box girder 50 in the arch ring, uses a horse plate to match and position, and uses a cable wind rope to temporarily reinforce the steel box girder 50. The suspension rod 60 is connected, and then the first-level suspension rod 60 is tensioned, and the line shape is observed and adjusted, and the second-level tensioning is performed. Finally, it is welded and fixedly connected with the steel box girder 50 outside the arch ring, and the floating crane 40 is unhooked. In the same way, the installation of the steel box girder 50 of the symmetrical bridge axis is completed.

[0082] Step S150: Install other steel box girders 50 outside the arch ring in sequence according to the above steps until the steel box girders 50 are connected.

[0083] Please also read Fig.13 Specifically, the floating crane 40 hoists the second steel box girder 50 in the arch ring. No hoisting equipment is used during the hoisting process. The steel wire rope is directly connected to the lifting lug on the steel box girder 50. The horse plate is used for matching positioning, and the cable wind rope is used to temporarily reinforce the steel box girder 50. The suspension rod 60 is connected, and then the first-level suspension rod 60 is tensioned. The line shape is observed and adjusted, and the second-level tensioning is performed. Finally, it is fixedly connected with the first steel box girder 50 in the arch ring by welding, and the floating crane 40 is unhooked. In the same way, the installation of the steel box girder 50 of the symmetrical bridge axis is completed.

[0084] Please also read Fig.14 The floating crane 40 hoists the 3rd to nth steel box girders 50 in sequence on the east and west sides, and uses the same method to install the steel box girders 50 until the remaining steel box girders 50 of the joint section.

[0085] Please also read Fig.15 The specific steps of closing the steel box girder 50 are: according to the monitoring data, observe and collect meteorological data, observe the temperature deformation of the steel box girder 50, make linear adjustments and adjust the cable tension of the hanger 60, and obtain the closing instruction from the third-party monitoring; according to the measured data of the closing section, the steel box girder 50 of the closing section is equipped on the transport ship; the floating crane 40 hoists the steel box girder 50 of the closing section, matches and positions it, makes fine adjustments to the linear shape, and welds the steel box girder 50 of the closing section; removes the wind cables connected to the steel box girder 50, and installs dampers, etc.

[0086] In the construction method of the above-mentioned mid-span steel box basket arch bridge, the arch rib 20 and the steel box beam 50 are hoisted by the floating crane 40, so the tower 30 only needs to bear the tension of the arch rib 20 oblique buckle hanging, and does not need to bear the force of the cable hanger and the hoisting object. The strength requirement of the tower 30 is not high, and there is no need to set up a large-section tower 30 and a large number and depth of anchors. The cost of the floating crane 40 itself is low and can be used in a turnover manner, which can reduce the construction cost of the arch bridge. At the same time, before the arch rib 20 is closed, the steel box beam 50 outside the arch ring is installed, and the construction method of arch first and beam later is not completely adopted. The hoisting and installation space of the steel box beam 50 is sufficient, which will not affect the installation of the steel box beam 50 outside the arch ring.

[0087] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A construction method for a mid-span steel box basket arch bridge, characterized in that: The following steps are involved: Installation and adjustment of the cable stay system and the floating crane entering the site; The arch rib is lifted by the floating crane, transported to the installation location, and then the buckle cable and the back cable are hung to install the arch rib, and the arch rib is installed symmetrically to the bridge axis; The arch ribs are installed in sequence according to the above steps until the arch ribs are closed; and before the arch ribs are closed, the steel box girder outside the arch ring is lifted and transported by the floating crane, and the steel box girder is transported to the place and then installed outside the arch ring; The steel box girder in the arch ring is lifted by floating crane, and after being transported to the place, the steel box girder is installed, and the steel box girder installation of the symmetrical bridge axis is completed; Follow the above steps to install other steel box girders in the arch ring in sequence until the steel box girders are connected.

2. The construction method of the mid-through steel box basket arch bridge according to claim 1 is characterized in that: The steps of installing and adjusting the cable-stayed system and bringing the floating crane into the site also include: The arch seat is constructed and the arch seat foundation pit is backfilled. Then the transition pier and cap beam are constructed on the arch seat. The first section of the arch rib and the tower foundation are embedded. The arch seat is cast. Conduct arch rib anchor tensioning and pour epoxy mortar; The site was cleaned and the back cable anchor system, tower cable wind anchor, arch rib anchor and floating shore anchor were constructed.

3. The construction method of the mid-through steel box basket arch bridge according to claim 2 is characterized in that: The steps of installing and adjusting the inclined cable system are specifically as follows: The tower is assembled and the cross braces are connected on the tower foundation, the tower wind cables are hung, the tower access, platform and anchor beams are constructed, and finally the tower is adjusted and accepted.

4. The construction method of the mid-through steel box basket arch bridge according to claim 1 is characterized in that: The steps of using the floating crane to lift the arch rib, transporting it to the installation location, and then hanging the buckle cable and the back cable to install the arch rib are specifically as follows: Move the floating crane to turn over the arch rib, then lift the arch rib with the floating crane and transport it longitudinally to the installation location; After the arch rib is matched and positioned, it is connected with the high bolt of the previous arch rib, and the buckle cable and back cable are hung; After fine-tuning the linear shape, tension the anchor cables, loosen the hooks by floating, and weld the rear end of the arch rib.

5. The construction method of the mid-through steel box basket arch bridge according to claim 1 is characterized in that: After the third section of the arch rib is installed, the steel box girder outside the arch ring is installed.

6. The construction method of the mid-through steel box basket arch bridge according to claim 1 is characterized in that: The steps of using the floating crane to lift and transport the steel box girder outside the arch ring, and transporting the steel box girder to the location and installing it outside the arch ring are specifically as follows: The floating crane uses a shoulder pole sling to hoist the steel box girder outside the arch ring as a whole. The steel box girder is matched, positioned and temporarily reinforced, and finally installed on the transition pier, cap beam and arch rib.

7. The construction method of a mid-through steel box basket arch bridge according to claim 1 is characterized in that: The steps for installing the steel box girder in the arch ring also include: Remove the cable-stayed system and the back cables and cables of the arch ribs.

8. The construction method of the mid-through steel box basket arch bridge according to claim 7 is characterized in that: The steps of removing the inclined-stayed cable system and removing the back cables and the cables of the arch ribs are specifically as follows: The buckle cables and back cables are unloaded and removed symmetrically in stages; Remove the tower frame, tower cable and arch rib cable; The back-rope ground anchor and tower cable wind anchor are removed.

9. The construction method of a mid-through steel box basket arch bridge according to claim 1, characterized in that: The steps of using floating hoist to lift the steel box girder in the arch ring and installing the steel box girder after transporting it to the destination are specifically as follows: The steel box girder in the arch ring is hoisted by floating crane. After being transported to the place, it is positioned by matching with horse plates and temporarily reinforced with cable wind. The suspenders are connected, and then the first stage suspenders are tensioned, the line shape is observed and adjusted, and the second stage tensioning is carried out; Weld around the previous section of steel box girder and loosen the hook by floating hoist.

10. The construction method of a mid-through steel box basket arch bridge according to claim 9, characterized in that: The steps of closing the steel box girder are specifically as follows: According to the monitoring data, observe and collect meteorological data, observe the temperature deformation of the steel box girder, make line adjustments and suspender cable tension adjustments, and obtain closure instructions from third-party monitoring; According to the measured joint section data, the steel box girder of the joint section is cut and assembled on the transport ship; The floating crane hoists the steel box girder of the joint section, matches and positions it, makes fine adjustments to the line shape, and welds the steel box girder of the joint section; Remove the wind cables connected to the steel box girder and install the damper.

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