A construction process for an integral floating bridge

Abstract

The present invention discloses a construction process for an integrated floating bridge, including: process 1: assembling multiple floating bridge sections on the water surface, each section being welded together; process 2: assembling the multiple floating bridge sections into the floating bridge body; process 3: constructing the shore-connected cable-stayed bridge, the abutments, and the suction anchors of the mooring system; process 4: connecting the shore-side end of the floating bridge transition section with the water-side end of the abutments; process 5: connecting one end of the floating bridge body with the water-side end of the floating bridge transition section; process 6: connecting the other end of the floating bridge body with the water-side end of the shore-connected cable-stayed bridge; and process 7: connecting the floating bridge body with the mooring system. In both processes 4 and 5, four winches and four rope piles are used in conjunction with a guide mechanism for guidance; in process 6, four winches and four rope piles are used in conjunction with each other. The present invention can effectively ensure a smooth and safe transition between the two ends of the floating bridge column and the shore-connected structure.

Description

Technical Field

[0001] The invention relates to a construction process for an integral floating bridge. Background Art

[0002] Over the past 30 years, floating bridges have been incorporated into modern infrastructure, and their technology has rapidly developed and matured, becoming a crucial component of modern infrastructure. However, compared to land-based bridges, including cable-stayed and suspension bridges, data on floating bridges is still very limited, particularly regarding their construction records, environmental conditions, durability, operation, and performance. Currently, the number of long floating bridges worldwide is very limited, at only about 20.

[0003] Most of the floating bridges built abroad are continuous pontoon structures. The square pontoons at the bottom of this type of floating bridge are connected end to end to form a continuous floating structure. The upper part of the pontoons can directly bear vehicle traffic loads, and piers or frame structures can also be set up to increase the bridge deck elevation.

[0004] The entire bridge is 5,530 meters long and consists of a shore-connected cable-stayed bridge and a continuous floating bridge in the water. The floating bridge connects to the cable-stayed bridge at its south end and to the north abutment at its north end. The cable-stayed bridge is 780 meters long, while the floating bridge is a 38-span, 125-meter-long continuous floating steel structure with a total length of 4,750 meters. The main beam is 27 meters wide, the pier heights range from 7.15 meters to 45.56 meters, and the pontoon dimensions are 53 meters by 14.9 meters. Twelve suction anchors are installed throughout the bridge to constrain the floating bridge's movement.

[0005] Existing pontoon bridge construction typically utilizes a spliced ​​structure, with connectors installed between the individual pontoon units. These connectors connect the units together to form a complete structure. Because the bridge structure floats entirely on the water, construction must account for adverse loads such as currents, waves, and wind. Furthermore, considerations must be given to the transport of the individual pontoon units, stability during installation, and installation accuracy. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a construction process for an integral floating bridge, which can effectively ensure a smooth and safe transition between the two ends of the floating bridge column and the shore connection structure.

[0007] The object of the present invention is achieved as follows: a construction process for an integral floating bridge, wherein one end of the floating bridge body is connected to a shore-connected cable-stayed bridge; the floating bridge body is spliced ​​together by multiple sections of floating bridge units, each section of the floating bridge unit includes a main beam segment and two floating piers, each floating pier includes a pontoon and a pier column fixed between the center of the top surface of the pontoon and the bottom surface of the main beam segment; the other end of the floating bridge body is connected to the abutment through a floating bridge transition section; the floating bridge transition section also includes a main beam segment and two pontoons; each main beam segment is spliced ​​together by multiple main beam unit sections; the mooring system of the floating bridge body includes three groups of suction anchors, each group of suction anchors consists of two pairs of suction anchor mechanisms, and the three groups of suction anchor mechanisms are connected to the middle part of the floating bridge body at intervals; the construction process includes the following process:

[0008] Process 1: assemble multiple sections of floating bridge units on the water surface, and each section of floating bridge units is spliced ​​together by welding;

[0009] Process 2: assembling multiple sections of floating bridge units into the main body of the floating bridge;

[0010] Process three: Construction of the shore-connected cable-stayed bridge, abutment construction, and suction anchor construction for the mooring system;

[0011] Process 4: Connecting the shore side of the floating bridge transition section to the water side of the abutment, including the following steps:

[0012] Step 1: Install winches No. 1 to No. 4 on the top surface of the main beam segment of the floating bridge transition section, install cable piles No. 1 to No. 4 on the top surface of the water side end of the abutment, and install a guide mechanism between the water side end of the abutment and the shore side end of the floating bridge transition section. The guide mechanism consists of a rotating shaft welded to one side surface of the shore side end of the main beam segment of the floating bridge transition section and a rotating groove welded to one side surface of the water side end of the abutment.

[0013] Step 2: Use a tugboat to tow the pontoon bridge transition section to the vicinity of the abutment and withdraw the tugboat;

[0014] Step 3: Fix the wire ropes of the No. 1, No. 2 and No. 3 winches on the pontoon transition section to the No. 1, No. 3 and No. 2 rope piles on the abutment in a corresponding manner;

[0015] Step 4: Start the No. 1 winch to slowly pull the pontoon bridge transition section closer to the abutment; adjust the relative position of the pontoon bridge transition section and the abutment using the No. 2 and No. 3 winches until the rotating shaft of the guide structure enters the rotating groove, and continue to start the No. 1 winch to close the guide mechanism;

[0016] Step 5: Connect the wire rope of the No. 4 winch on the pontoon transition section to the No. 4 rope pile fixed on the abutment;

[0017] Step 6: Start the No. 4 winch to make the shore-side end of the floating bridge transition section close to the water-side end of the abutment;

[0018] Step 7: First install the pin bolts between the matching parts of the floating bridge transition section and the matching parts of the abutment; then weld the joints between the floating bridge transition section and the abutment;

[0019] Step 8: Remove all matching parts, winch No. 1 to winch No. 4, and cable pile No. 1 to cable pile No. 4;

[0020] Step 5: Connect one end of the floating bridge body to the water side end of the floating bridge transition section according to the method of step 4;

[0021] Process 6: The other end of the floating bridge body is connected to the water side end of the shore-connected cable-stayed bridge, and includes the following steps:

[0022] Step 1: Install winches No. 5 to No. 8 on the top surface of the water side end of the shore-connected cable-stayed bridge, and install cable piles No. 5 to No. 8 on the top surface of the other end of the floating bridge body;

[0023] Step 2: When the temperature is lowest, connect the wire rope of winch No. 7 to cable pile No. 6, start winch No. 7, and slowly bring the other end of the floating bridge body closer to the water side of the shore-connected cable-stayed bridge.

[0024] Step 3: Connect the wire ropes of the No. 5 winch, the No. 6 winch, and the No. 8 winch to the No. 5 cable pile, the No. 7 cable pile, and the No. 8 cable pile one by one, start the No. 6 winch and the No. 7 winch, adjust the relative position between the other end of the floating bridge body and the water side end of the shore cable-stayed bridge, and then start the No. 5 winch and the No. 8 winch to slowly pull the floating bridge body toward the shore cable-stayed bridge. During the process, the No. 6 winch and the No. 7 winch are used to correct the relative position of the floating bridge body and the shore cable-stayed bridge at any time;

[0025] Step 4: After the end face of the other end of the floating bridge body and the end face of the water side end of the shore-connected cable-stayed bridge are completely close together, first install the pin bolts between the matching piece of the other end of the floating bridge body and the matching piece of the water side end of the shore-connected cable-stayed bridge; then weld the seam between the other end of the floating bridge body and the water side end of the shore-connected cable-stayed bridge;

[0026] Step 5: Remove all matching parts, winches No. 5 to No. 8, and cable piles No. 5 to No. 8;

[0027] Process seven: Connect the main body of the pontoon to the mooring system; first connect one end of the mooring cable to the suction anchor, and after the floating pier is towed to the predetermined position, connect the mooring cable to the towing chain on the floating pier, and tension the mooring cable to the designed pre-tension through a winch or hoist.

[0028] The above-mentioned overall construction process of the floating bridge, wherein the process 1 includes the following steps:

[0029] Step 1: Set up an assembly cradle on land near the water, with the length of the assembly cradle perpendicular to the shoreline and no less than the length of a single-span floating bridge; install a pair of sliding rails on the top surface of the assembly cradle, and install a number of walking jacks and a gantry crane at intervals on the pair of sliding rails; set a lower step at the front end of the assembly cradle, and install a step jack on the top surface of the lower step. When the step jack is fully retracted, the height difference between it and the top of the assembly cradle is greater than the free deflection height of the tail of the main beam segment of the floating bridge unit in the floating state;

[0030] Step 2: Use a gantry crane to hoist several main beam units onto the assembly cradle, and use the walking jacks on the assembly cradle to adjust the spatial position of the main beam units to complete the section-by-section splicing of the first half of the main beam segment, and install the first pier column head on the middle bottom surface of the first half of the main beam segment;

[0031] Step 3: After the assembly of the front half of the main beam segment is completed, the front half of the main beam segment is pushed forward by a walking jack until the front of the front half of the main beam segment is suspended in the air, and the suspended length is adapted to the length of a main beam unit section;

[0032] Step 4: First, tow the temporary floating pier to the bottom of the front end of the front half main beam segment; the temporary floating pier consists of a barge and a steel support; the barge is moored with its longitudinal direction perpendicular to the length direction of the assembled tire frame; the steel support includes two groups of steel pipe piles fixed to the deck of the barge at intervals along the longitudinal direction of the barge, two groups of longitudinal steel sections fixed one-to-one to the top of the two groups of steel pipe piles, and two floating pier jacks installed one-to-one on the top surfaces of the two groups of longitudinal steel sections; then, lift the two floating pier jacks to put force on the temporary floating pier;

[0033] Step 5: Continue to use the walking jacks on the assembly cradle to gradually push the front half of the main beam segment forward. During the pushing process, gradually adjust the lifting height of the two floating pier jacks on the temporary floating pier to keep the vertical elevation of the front end of the front half of the main beam segment unchanged. The temporary floating pier also moves forward with the advancement of the front half of the main beam segment until the first pier head on the front half of the main beam segment is exposed from the lower step of the assembly cradle.

[0034] Step 6: First, the first floating pier assembled on the water is towed to the bottom of the first pier column head, and then the pier column body on the first floating pier is welded to the first pier column head to complete the connection between the first floating pier and the first half of the main beam segment;

[0035] Step 7: First, assemble the rear half of the main beam segment on the assembly frame according to the method of step 2, and connect the front end of the rear half of the main beam segment with the rear end of the front half of the main beam segment;

[0036] Step 8: Use the walking jack on the assembly frame to continue pushing the rear half of the main beam segment forward until the second pier head on the rear half of the main beam segment is exposed on the lower step of the assembly frame;

[0037] Step 9: Connect the second floating pier to the rear half of the main beam segment according to the method in step 6. At this point, the assembly of the floating bridge unit is complete.

[0038] Step 10: Use the walking jack on the assembly frame to continue pushing the rear half of the main beam segment forward until the tail of the rear half of the main beam segment reaches the lower step of the assembly frame;

[0039] Step 11: Lower the step jack on the lower step, that is, lower the support height of the lower step, so as to lower the elevation of the tail of the rear half main beam segment until the tail of the rear half main beam segment is completely in a free deflection state and completely disengaged from the step jack;

[0040] Step 12: first remove the temporary floating pier, and then tow the floating bridge unit floating on the water out of the assembly site.

[0041] The above-mentioned overall construction process of the floating bridge, wherein the second process is carried out, includes the following steps:

[0042] Step 1: Set up a jacking support on the water, which includes 16 steel pipe columns. The 16 steel pipe columns are arranged in four rows in the longitudinal direction of the bridge and in four rows in the transverse direction of the bridge; the height of the first row of steel pipe columns is equal to the height of the fourth row of steel pipe columns, and the height of the second row of steel pipe columns is equal to the height of the third row of steel pipe columns and is greater than the height of the first row of steel pipe columns; place a walking jack on the top surface of the first row of steel pipe columns and the top surface of the fourth row of steel pipe columns respectively; stack sliding supports and support blocks in sequence on the top surface of the second row of steel pipe columns; and place support blocks on the top surface of the third row of steel pipe columns;

[0043] Step 2: The tugboat tows the two sections of the floating bridge into the working range of the jacking support;

[0044] Step 3: First, place the butt joints of the main beam segments of the two floating bridge units on the top of the first row of steel pipe columns and the top of the fourth row of steel pipe columns on the jacking brackets one by one, then start the vertical cylinders of the walking jacks on the top of the first row of steel pipe columns and the vertical cylinders of the walking jacks on the top of the fourth row of steel pipe columns to lift the butt joints of the two main beam segments one by one, and then use the lateral displacement function of the walking jacks to preliminarily adjust the lateral positions of the two main beam segments;

[0045] Step 4: Start the longitudinal displacement function of the walking jack to drag the two sections of the floating bridge toward the middle of the jacking bracket;

[0046] Step 5: When the end faces of the butt joints of the main beam segments of the two floating bridge units extend beyond the second row of steel pipe columns and the third row of steel pipe columns one by one, slowly lower the vertical cylinder of the walking jack so that the butt joints of the two main beam segments fall one by one on the support pads on the top of the second row of steel pipe columns and the support pads on the top of the third row of steel pipe columns, and continue to lower the vertical cylinder of the walking jack until the floating bridge units above are completely emptied, so that the weight of the butt joints of the two main beam segments is completely borne by the support pads on the top of the second row of steel pipe columns and the support pads on the top of the third row of steel pipe columns one by one;

[0047] Step 6: Install several longitudinal pulling and closing oil cylinders with extended piston rods at intervals between the top surfaces of the butt joints of the two main beam segments, and control the retraction of the piston rods of the several longitudinal pulling and closing oil cylinders. At this time, the floating bridge unit located above the third row of steel pipe columns remains fixed, and the floating bridge unit located above the second row of steel pipe columns moves with the sliding support, further pulling the end surfaces of the butt joints of the two main beam segments together, and using the expansion and contraction of the longitudinal pulling and closing oil cylinders to fine-tune the longitudinal relative positions, so that the gap width between the end surfaces of the butt joints of the two main beam segments meets the design requirements;

[0048] Step 7: Install a number of transverse fine-tuning cylinders at intervals between the top surfaces of the butt joints of the two main beam segments. Adjust the transverse positions of the two main beam segments through the transverse fine-tuning cylinders. After the axes of the two main beam segments are adjusted into place, weld a number of sets of limit steel plates on the top surfaces of the butt joints of the two main beam segments to limit the transverse displacement between the two main beam segments, thereby achieving precise transverse relative positioning of the two main beam segments.

[0049] Step 8: Welding horse plates around the end faces of the butt joints of the two main beam segments to complete the welding work between the end faces of the butt joints of the two main beam segments to form a floating bridge unit;

[0050] Step 9: Remove all longitudinal tensioning cylinders, transverse fine adjustment cylinders, limit steel plates and horse plates;

[0051] Step 10: First, lift the vertical cylinders of the walking jacks on the top of the first row of steel pipe columns and the vertical cylinders of the walking jacks on the top of the fourth row of steel pipe columns to make the support blocks on the top of the second row of steel pipe columns and the support blocks on the top of the third row of steel pipe columns clear of the pontoon unit, and then remove all the support blocks;

[0052] Step 11: Control the vertical oil cylinders of the walking jacks on the top of the first row of steel pipe columns and the vertical oil cylinders of the walking jacks on the top of the fourth row of steel pipe columns to retract, so that the floating bridge unit deflects downward under the action of its own weight, and the vertical oil cylinders of the straight walking jacks completely detach from the floating bridge unit;

[0053] Step 12: Use a tugboat to drag the pontoon unit laterally to move the pontoon unit out of the working range of the jacking support.

[0054] The overall construction process of the floating bridge of the present invention has the following characteristics:

[0055] 1) The method of first connecting a section of the floating bridge transition section to the abutment and then connecting one end of the floating bridge body to the floating bridge transition section solves the construction difficulty of directly connecting the floating bridge column to the abutment. The floating bridge transition section is not only convenient for towing compared to the floating bridge body, but also ensures stability and installation accuracy during the installation process, effectively ensuring a smooth and safe transition between the floating bridge column and the abutment;

[0056] 2) Four winches and four rope piles are used in the connection construction between the floating bridge transition section and the abutment, and between the floating bridge transition section and the floating bridge column. The guide mechanism effectively ensures the docking accuracy between the floating bridge transition section and the abutment, and between the floating bridge transition section and the floating bridge column.

[0057] 3) Four winches and four rope piles are used in the connection construction between the floating bridge column and the shore-connected cable-stayed bridge. The stability and installation accuracy can be guaranteed during the installation process, effectively ensuring a smooth and safe transition between the floating bridge column and the shore-connected cable-stayed bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a side view of the state when performing step 2 in process 1 of the present invention;

[0059] Figure 2 It is a side view of the state when performing step 4 in process 1 of the present invention;

[0060] Figure 2a is an elevational view of a temporary floating pier used when performing step 4 of process one of the present invention;

[0061] Figure 3 It is a side view of the state when performing step 6 in process 1 of the present invention;

[0062] Figure 4 It is a side view of the state when performing step 7 in process 1 of the present invention;

[0063] Figure 5 This is a side view of the state when performing step eight in process one of the present invention;

[0064] Figure 6 It is a side view of the state when performing step nine in process one of the present invention;

[0065] Figure 7 This is a side view of the state when performing step ten in process one of the present invention;

[0066] Figure 8 This is a side view of the state when performing step 11 in process 1 of the present invention;

[0067] Figure 9 This is a side view of the state when performing step 12 of the process 1 of the present invention;

[0068] Figure 10 It is a plane diagram of the state when performing step 2 in process 2 of the present invention;

[0069] Figure 10a It is a side view of the state when performing step 2 in process 2 of the present invention;

[0070] Figure 11 This is a side view of the first state when performing step three in process two of the present invention;

[0071] Figure 12 It is a side view of a second state when performing step three in process two of the present invention;

[0072] Figure 13 It is a side view of the state when performing step 5 in process 2 of the present invention;

[0073] Figure 14 It is a side view of the state when performing step 6 in process 2 of the present invention;

[0074] Figure 14a It is a plane diagram of the state when performing step 6 in process 2 of the present invention;

[0075] Figure 15 It is a side view of the state when performing step 7 in process 2 of the present invention;

[0076] Figure 16 It is a side view of the state when performing step eight in process two of the present invention;

[0077] Figure 17 This is a side view of the state when performing step 10 in process 2 of the present invention;

[0078] Figure 18 It is a plane diagram of the state when performing step 12 in process 2 of the present invention;

[0079] Figure 19 is a state plan view of process 4 of the present invention;

[0080] Figure 20 It is a plane diagram of the state when performing step 2 in process 4 of the present invention;

[0081] Figure 20a It is an enlarged plan view of the state when performing step 3 in process 4 of the present invention;

[0082] Figure 20b It is an enlarged plan view of the state when performing step 4 in process 4 of the present invention;

[0083] Figure 20c It is an enlarged plan view of the state when performing step 5 in process 4 of the present invention;

[0084] Figure 20d It is an enlarged plan view of the state when performing step 6 in process 4 of the present invention;

[0085] Figure 20e This is an enlarged plan view of the state when performing step 7 in process 4 of the present invention;

[0086] Figure 20f It is a side view of the state when performing step eight in process four of the present invention;

[0087] Figure 21 is a state plan view of process five of the present invention;

[0088] Figure 22 is a state plan view of process 6 of the present invention;

[0089] Figure 22a It is an enlarged plan view of the state when performing step 2 in process 6 of the present invention;

[0090] Figure 22b It is an enlarged plan view of the state when performing step 3 in process 6 of the present invention;

[0091] Figure 22c It is an enlarged plan view of the first state when performing step 4 in process 6 of the present invention;

[0092] Figure 22d is a side view of a second state when performing step 4 in process 6 of the present invention;

[0093] Figure 23 It is a state plan view of process seven of the present invention. DETAILED DESCRIPTION

[0094] The present invention will be further described below with reference to the accompanying drawings.

[0095] See also Figures 1 to 23The overall construction process of the floating bridge of the present invention is as follows: the south end of the floating bridge body 100 is connected to the shore-connected cable-stayed bridge 201, and the shore-connected cable-stayed bridge 201 is supported by piers 1 and 2; the floating bridge body 100 is composed of 19 250m long floating bridge units 10, each of which includes a main beam segment 1A and two floating piers 1B. Each floating pier 1B consists of a pontoon 11 and a pier column 14 fixed between the center of the top surface of the pontoon 13 and the bottom surface of the main beam segment 1A; the floating bridge body 10 The north end of the pontoon bridge 0 is connected to the abutment 202 through a floating bridge transition section 10', which is supported by a main beam segment 1A and pontoon piers No. 39 to No. 40; each main beam segment 1A is spliced ​​together by multiple main beam unit sections; the mooring system of the floating bridge body 100 includes three sets of suction anchor mechanisms 300, each set of suction anchor mechanisms 300 is composed of two pairs of suction anchors, and the three sets of suction anchor mechanisms 300 are connected to pontoon piers No. 12, No. 20 and No. 27 in a one-to-one correspondence.

[0096] The overall construction process of the floating bridge of the present invention includes the following steps:

[0097] Process 1: assembling multiple sections of floating bridge monomers 10 on the water surface. Each section of floating bridge monomer 10 is assembled by welding and includes the following steps:

[0098] Step 1: Set up an assembly cradle 2 on land near the water, with the length of the assembly cradle 2 perpendicular to the shoreline and no less than the length of a single-span floating bridge; install a pair of sliding rails on the top surface of the assembly cradle 2, and install four walking jacks 21 and a gantry crane 22 at intervals on the pair of sliding rails; set a lower step 20 at the front end of the assembly cradle 2, and install a step jack 23 on the top surface of the lower step 20. When the step jack 23 is fully retracted, the height difference between it and the top of the assembly cradle 2 is greater than the free deflection height of the tail of the main beam segment of the floating bridge unit 10 in the floating state;

[0099] Step 2: Use the gantry crane 22 to hoist several main beam unit sections onto the assembly frame 2, and use the walking jack 21 on the assembly frame 2 to adjust the spatial position of the main beam unit section. The lifting height of the step jack 23 is adapted to the lifting height of the walking jack 21, and the first pier head 140 (see Figure 14) is installed on the middle bottom surface of the first half of the main beam segment 11. Figure 1 );

[0100] Step 3: After the assembly of the front half main beam segment 11 is completed, the front half main beam segment 11 is pushed forward by the walking jack 21 until the front part of the front half main beam segment 11 is suspended in the air, and the suspended length is adapted to the length of one main beam unit section;

[0101] Step 4: First, the temporary floating pier 3 is towed to the bottom of the front end of the front half main beam segment 11 (see Figure 2 The temporary floating pier 3 is composed of a barge 3A and a steel support 3B. The barge 3A is moored in such a way that its longitudinal direction is perpendicular to the longitudinal direction of the assembled tire frame 2. The steel support 3B includes two groups of steel pipe piles 31 fixed on the deck of the barge 3A at intervals along the longitudinal direction of the barge 3A, two groups of longitudinal steel sections 32 fixed on the top of the two groups of steel pipe piles 31 in a one-to-one correspondence, and two floating pier jacks 33 installed on the top surfaces of the two groups of longitudinal steel sections 32 in a one-to-one correspondence (see FIG. Figure 2a ); and then lift the two floating pier jacks 33, so that the temporary floating pier 3 is stressed, even if the two floating pier jacks 33 are supported on the front end of the front half of the main beam segment 11;

[0102] Step 5: Continue to use the walking jacks 21 on the assembly cradle 2 to gradually push the front half of the main beam segment 11 forward. During the pushing process, gradually adjust the lifting height of the two floating pier jacks 33 on the temporary floating pier 3 to keep the vertical elevation of the front end of the front half of the main beam segment 11 unchanged. Alternatively, the vertical elevation of the front end of the front half of the main beam segment 11 can be adjusted by setting support blocks on the two floating pier jacks 33. The temporary floating pier 3 also moves forward as the front half of the main beam segment 11 moves forward until the first pier head 140 on the front half of the main beam segment 11 is exposed from the lower step 20 of the assembly cradle 2.

[0103] Step 6: First, the upper part of the first floating pier assembled on the water is towed to the bottom of the first pier head 140, and then the pier body 14 on the first floating pier 1B is welded to the first pier head 140 to complete the connection between the first floating pier 1B and the front half of the main beam segment 11 (see Figure 3 );

[0104] Step 7: First, assemble the rear half of the main beam segment 12 on the assembly frame 2 according to the method of step 2, and connect the front end of the rear half of the main beam segment 12 with the rear end of the front half of the main beam segment 11 to form a main beam segment 1A (see Figure 4 );

[0105] Step eight, use the walking jack 21 on the assembly frame 2 to continue pushing the rear half main beam segment 12 forward, and the temporary floating pier 3 then moves forward along with the half main beam segment 12 until the second pier head 140 on the rear half main beam segment 12 is exposed from the lower step 20 of the assembly frame 2 (see Figure 5 );

[0106] Step 9: Connect the second floating pier 1B to the rear half of the main beam segment 12 according to the method of step 6. At this point, the pontoon bridge monomer 10 has been assembled (see Figure 6 );

[0107] Step 10: Use the walking jack 21 on the assembly frame 2 to continue pushing the rear half main beam segment 12 forward, and the temporary floating pier 3 then moves forward along with the half main beam segment 12 until the tail of the rear half main beam segment 12 reaches the lower step 20 of the assembly frame 2 (see Figure 7 );

[0108] Step 11: Lower the step jack 23 on the lower step 20, that is, lower the support height of the lower step 20, so as to lower the elevation of the tail of the rear half main beam segment 12, until the tail of the rear half main beam segment 12 is completely in a free deflection state and completely separated from the step jack 23 (see FIG. Figure 8 );

[0109] Step 12: first remove the temporary floating pier 3 so that the assembled floating bridge unit 10 floats on the water (see Figure 9 ), and then tow the floating bridge unit 10 floating on the water out of the assembly site;

[0110] Step 13: Repeat steps 2 to 12 to assemble the next section of the floating bridge unit.

[0111] Process 2: assembling the 19 sections of floating bridge into the main body of the floating bridge; including the following steps:

[0112] Step 1: Set up a jacking support 40 on the water. The jacking support 40 includes 16 steel pipe columns. The 16 steel pipe columns are arranged in four rows in the longitudinal direction of the bridge and in four rows in the transverse direction of the bridge. The spacing between the first row of steel pipe columns and the second row of steel pipe columns is equal to the spacing between the third row of steel pipe columns and the fourth row of steel pipe columns. The spacing between the second row of steel pipe columns and the third row of steel pipe columns is greater than the spacing between the first row of steel pipe columns and the second row of steel pipe columns. The height of the first row of steel pipe columns 41 is equal to the height of the fourth row of steel pipe columns 44. The height of the second row of steel pipe columns 42 is equal to the height of the third row of steel pipe columns 43. The height of the first row of steel pipe columns 41 is equal to and greater than that of the first row of steel pipe columns 41; steel supports 45 are set between adjacent steel pipe columns; a walking jack 4 is placed on the top surface of the first row of steel pipe columns 41 and the top surface of the fourth row of steel pipe columns 44; sliding supports 50 and support blocks 5 are stacked in sequence on the top surface of the second row of steel pipe columns 42; support blocks 5 are placed on the top surface of the third row of steel pipe columns 43; the top height of the support blocks 5 is determined according to calculations to offset the deflection of the deadweight of the joints of the two sections of the floating bridge monomers 10, so that the main beam segments 1A of the two sections of the floating bridge monomers 10 can be smoothly connected;

[0113] Step 2: Eight tugboats 400 are used to tow the two sections of floating bridge monomers 10 into the working range of the lifting bracket 40 (see Figure 10 and Figure 10a );

[0114] Step 3: First, place the joints of the main beam segments 1A of the two sections of the floating bridge monomer 10 on the top of the first row of steel pipe columns 41 and the top of the fourth row of steel pipe columns 44 of the jacking bracket 40 (see Figure 11 ), and then start the vertical oil cylinders of the walking jacks 4 on the top of the first row of steel pipe columns 41 and the vertical oil cylinders of the walking jacks 4 on the top of the fourth row of steel pipe columns 44, and lift the butt ends of the two sections of floating bridge monomers 10 one by one. Then, use the lateral displacement function of the walking jacks 4 to preliminarily adjust the lateral positions of the two main beam segments 1A (see Figure 12 );

[0115] Step 4: Activate the longitudinal displacement function of the walking jacks 4 on the top surface of the first row of steel pipe columns 41 and the walking jacks 4 on the top surface of the fourth row of steel pipe columns 44 to drag the two sections of the floating bridge monomers 10 toward the middle of the jacking bracket 40;

[0116] Step 5: When the end faces of the joints of the main beam segments 1A of the two sections of the floating bridge 10 correspond to each other and exceed the second row of steel pipe columns 42 and the third row of steel pipe columns 43, slowly lower the vertical oil cylinders of the walking jacks 4 on the top surfaces of the first row of steel pipe columns 41 and the vertical oil cylinders of the walking jacks 4 on the top surfaces of the fourth row of steel pipe columns 44, so that the joints of the two main beam segments 1A fall one by one on the support pads 5 on the top surfaces of the second row of steel pipe columns 42 and the third row of steel pipe columns. The vertical oil cylinders of the walking jacks 4 on the tops of the first row of steel pipe columns 41 and the vertical oil cylinders of the walking jacks 4 on the tops of the fourth row of steel pipe columns 44 are lowered until the floating bridge unit 10 above is completely emptied, so that the weight of the joints of the two main beam segments 1A is completely borne by the supporting blocks 5 on the tops of the second row of steel pipe columns 42 and the supporting blocks 5 on the tops of the third row of steel pipe columns 43 (see FIG. Figure 13 );

[0117] Step six, install two longitudinal pulling and closing oil cylinders 6A with piston rods extending therefrom at intervals between the top surfaces of the butt joints of the two main beam segments 1A. Each longitudinal pulling and closing oil cylinder 6A is installed between the top surfaces of the butt joints of the two sections of floating bridge monomers 10 through two pairs of brackets 61, and control the piston rods of the two longitudinal pulling and closing oil cylinders 6A to retract. At this time, the floating bridge monomer 10 located above the third row of steel pipe columns 43 remains fixed, and the floating bridge monomer 10 located above the second row of steel pipe columns 42 moves with the sliding support 50, further pulling the end faces of the butt joints of the two main beam segments 1A closer together, and using the expansion and contraction of the longitudinal pulling and closing oil cylinders 6A to fine-tune the longitudinal relative position, so that the gap width between the end faces of the butt joints of the two main beam segments 1A meets the design requirements (see Figure 14 and Figure 14a );

[0118] Step 7: Install two transverse fine-tuning cylinders 6B at intervals between the top surfaces of the butt joints of the two main beam segments 1A, and adjust the transverse positions of the two main beam segments 1A through the two transverse fine-tuning cylinders 6B; each transverse fine-tuning cylinder 6B is installed between the top surfaces of the butt joints of the two main beam segments 1A through two transverse bridge supporting steel plates 60 welded one-to-one on the top surfaces of the butt joints of the two main beam segments 1A; when the axes of the two main beam segments 1A are adjusted in place After that, two sets of limiting steel plates 6C are welded on the top surfaces of the joints of the two main beam segments 1A. Each set of limiting steel plates 6C is composed of three steel plates arranged in a transverse herringbone shape, that is, two steel plates are welded on the top surface of one main beam segment 1A, and another steel plate is welded on the top surface of the other main beam segment 1A and sandwiched between the two opposite steel plates to limit the lateral displacement between the two sections of the floating bridge monomers 10, thereby achieving the precise lateral relative positioning of the two sections of the floating bridge monomers 10 (see Figure 15 );

[0119] Step eight, weld the horse plate around the end face of the butt joint of the two main beam segments 1A, complete the welding work between the end faces of the butt joint of the two main beam segments 1A, and form a section of floating bridge unit 101 (see Figure 16 );

[0120] Step 9: Remove all the longitudinal tensioning cylinders 6A, transverse fine adjustment cylinders 6B, limit steel plates 6C, and horse plates;

[0121] Step 10: First, lift the vertical cylinders of the walking jacks 4 on the top of the first row of steel pipe columns 41 and the vertical cylinders of the walking jacks 4 on the top of the fourth row of steel pipe columns 44, so that the support pads 5 on the top of the second row of steel pipe columns 42 and the support pads 5 on the top of the third row of steel pipe columns 43 are detached from the pontoon unit 101 (see FIG. Figure 17 ), then remove all the support blocks 5;

[0122] Step 11: Control the vertical oil cylinders of the walking jacks 4 on top of the first row of steel pipe columns 41 and the vertical oil cylinders of the walking jacks 4 on top of the fourth row of steel pipe columns 44 to retract, and the floating bridge unit deflects downward under the action of its own weight until the vertical oil cylinders of the walking jacks 4 on top of the first row of steel pipe columns 41 and the vertical oil cylinders of the walking jacks 4 on top of the fourth row of steel pipe columns 44 are completely separated from the floating bridge unit 101;

[0123] Step 12: Use four tugboats 400 to drag the pontoon unit 101 horizontally to move the pontoon unit 101 out of the working range of the lifting bracket 40 (see Figure 18 ).

[0124] Process 3: Construction of the shore-connected cable-stayed bridge 201, abutment 202, and mooring system;

[0125] Process 4: The shore side end of the floating bridge transition section 10' is connected to the water side end of the abutment 202 (see Figure 19 ), and includes the following steps:

[0126] Step 1: Install winches 1 through 4 (71-74) on the top surface of the main beam segment 1A of the floating bridge transition section 10', install cable piles 1 through 4 (81-84) on the top surface of the waterside end of the abutment 202, and install a guide mechanism between the waterside end of the abutment 202 and the shoreside end of the floating bridge transition section 10'. The guide mechanism consists of a rotating shaft 91 welded to one side surface of the shoreside end of the main beam segment 1A of the floating bridge transition section 10' and a rotating groove 92 welded to one side surface of the waterside end of the abutment 100.

[0127] Step 2: Use the tugboat 400 to tow the floating bridge transition section 10' to the vicinity of the abutment 202 (see Figure 20 and Figure 20a ), withdraw tugboat 400;

[0128] Step 3: Fix the wire ropes of the No. 1 hoist 71, No. 2 hoist 72 and No. 3 hoist 73 on the floating bridge transition section 10' to the No. 1 rope pile 81, No. 3 rope pile 83 and No. 2 rope pile 82 on the abutment 202 (see Figure 20b );

[0129] Step 4: Start the No. 1 winch 71 to slowly pull the floating bridge transition section 10' closer to the abutment 202; adjust the relative position of the floating bridge transition section 10' and the abutment 202 by the No. 2 winch 72 and the No. 3 winch 73 until the rotating shaft 91 of the guide structure enters the rotating groove 92, and continue to start the No. 1 winch 71 to make the guide mechanism close (see Figure 20c );

[0130] Step 5: Connect the wire rope of the No. 4 winch 74 on the floating bridge transition section 10' to the No. 4 rope pile 84 fixed on the abutment 202 (see Figure 20d );

[0131] Step 6: Start the fourth winch 74 to make the shore-side end face of the floating bridge transition section 10' close to the water-side end face of the abutment 202 (see Figure 20e );

[0132] Step 7: Install the pin bolts 90 between the matching piece 9 of the floating bridge transition section 10' and the matching piece 9 of the abutment 202 to achieve accurate matching of the main beams of the two (see Figure 20f ); then perform welding of the joints between the floating bridge transition section 10 'and the abutment 202;

[0133] Step 8: Remove all matching parts 9, winches 1 to 4 71 to 74 and cable piles 1 to 4 81 to 84;

[0134] Process 5: Connect the north end of the floating bridge body 100 to the water side end of the floating bridge transition section 10' according to the method of process 4 (see Figure 21 );

[0135] Process 6: The south end of the floating bridge body 100 is connected to the water side end of the shore-connected cable-stayed bridge 201 (see Figure 22 ), and includes the following steps:

[0136] Step 1: Install winches 5 to 8 75 to 78 on the top surface of the water side end of the shore-connected cable-stayed bridge 201, and install cable piles 5 to 8 85 to 88 on the top surface of the south end of the floating bridge body 100;

[0137] Step 2: When the temperature is lowest, connect the wire rope of No. 7 hoist 77 to No. 6 cable pile 86, start No. 7 hoist 77, and make the other end of the floating bridge body 100 slowly approach the water side end of the shore cable-stayed bridge 201 (see Figure 22a );

[0138] Step 3: Connect the wire rope of the No. 5 hoist 75, the wire rope of the No. 6 hoist 76 and the wire rope of the No. 8 hoist 78 to the No. 5 cable pile 85, the No. 7 cable pile 87 and the No. 8 cable pile 88 one by one, start the No. 6 hoist 76 and the No. 7 hoist 77, adjust the relative position between the south end of the floating bridge body 100 and the water side end of the shore cable-stayed bridge 201, and then start the No. 5 hoist 75 and the No. 8 hoist 78 to slowly pull the floating bridge body 100 toward the shore cable-stayed bridge 201. During the process, the relative position of the floating bridge body 10 and the shore cable-stayed bridge 201 is corrected at any time by the No. 6 hoist 76 and the No. 7 hoist 77 (see Figure 22b );

[0139] Step 4: After the end face of the south end of the floating bridge body 100 and the end face of the water side end of the shore-connected cable-stayed bridge 201 are completely close together (see Figure 22c ), first install the pin bolts 90 between the matching piece at the south end of the floating bridge body 100 and the matching piece 9 at the water side end of the shore-connected cable-stayed bridge 201 to achieve accurate matching of the main beams of the two (see Figure 22d ); then weld the seam between the south end of the floating bridge body 100 and the water side end of the shore cable-stayed bridge 201;

[0140] Step 5: Remove all matching parts 9, winches 5 to 8 75-78 and cable piles 5 to 8 85-88;

[0141] Process 7: Connect the No. 12 floating pier, the No. 20 floating pier and the No. 27 floating pier in the floating bridge body 100 to the three sets of mooring mechanisms 300 one by one; first connect one end of the two pairs of mooring cables 302 to the two pairs of suction anchors 301 one by one, then connect the other ends of the two pairs of mooring cables 302 to the two pairs of traction chains connected to the two sides of the floating piers one by one, and then tension the mooring cables to the designed pretension (see Figure 23 ).

[0142] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A construction process for an integral floating bridge, wherein one end of the floating bridge body is connected to a shore-connected cable-stayed bridge; the floating bridge body is formed by splicing together multiple sections of floating bridge units, each section of the floating bridge unit comprising a main beam segment and two floating piers, each floating pier comprising a pontoon and a pier column fixed between the center of the top surface of the pontoon and the bottom surface of the main beam segment; the other end of the floating bridge body is connected to the abutment through a floating bridge transition section; the floating bridge transition section also comprises a main beam segment and two floating piers; each main beam segment is spliced ​​together by multiple main beam unit sections; the mooring system of the floating bridge body comprises three sets of suction anchors, each set of suction anchors comprising two pairs of suction anchor mechanisms, the three sets of suction anchor mechanisms being connected at intervals to the middle of the floating bridge body; and the characteristics are as follows: The construction process includes the following steps: Process 1: assemble multiple sections of floating bridge units on the water surface, and each section of floating bridge units is spliced ​​together by welding; Process 2: assembling multiple sections of floating bridge units into the main body of the floating bridge; Process three: Construction of the shore-connected cable-stayed bridge, abutment construction, and suction anchor construction for the mooring system; Process 4: Connecting the shore side of the floating bridge transition section to the water side of the abutment, and including the following steps: Step 1: Install winches No. 1 to No. 4 on the top surface of the main beam segment of the floating bridge transition section, install cable piles No. 1 to No. 4 on the top surface of the water side end of the abutment, and install a guide mechanism between the water side end of the abutment and the shore side end of the floating bridge transition section. The guide mechanism consists of a rotating shaft welded to one side surface of the shore side end of the main beam segment of the floating bridge transition section and a rotating groove welded to one side surface of the water side end of the abutment. Step 2: Use a tugboat to tow the pontoon bridge transition section to the vicinity of the abutment and withdraw the tugboat; Step 3: Fix the wire ropes of the No. 1, No. 2 and No. 3 winches on the pontoon transition section to the No. 1, No. 3 and No. 2 rope piles on the abutment in a corresponding manner; Step 4: Start the No. 1 winch to slowly pull the pontoon bridge transition section closer to the abutment; adjust the relative position of the pontoon bridge transition section and the abutment using the No. 2 and No. 3 winches until the rotating shaft of the guide structure enters the rotating groove, and continue to start the No. 1 winch to close the guide mechanism; Step 5: Connect the wire rope of the No. 4 winch on the pontoon transition section to the No. 4 rope pile fixed on the abutment; Step 6: Start the No. 4 winch to make the shore-side end of the floating bridge transition section close to the water-side end of the abutment; Step 7: First install the pin bolts between the matching parts of the floating bridge transition section and the matching parts of the abutment; then weld the joints between the floating bridge transition section and the abutment; Step 8: Remove all matching parts, winches No. 1 to No. 4, and cable piles No. 1 to No. 4; Step 5: Connect one end of the floating bridge body to the water side end of the floating bridge transition section according to the method of step 4; Process 6: The other end of the floating bridge body is connected to the water side end of the shore-connected cable-stayed bridge, and includes the following steps: Step 1: Install winches No. 5 to No. 8 on the top surface of the water side end of the shore-connected cable-stayed bridge, and install cable piles No. 5 to No. 8 on the top surface of the other end of the floating bridge body; Step 2: When the temperature is lowest, connect the wire rope of winch No. 7 to cable pile No. 6, start winch No. 7, and slowly bring the other end of the floating bridge body closer to the water side of the shore-connected cable-stayed bridge. Step 3: Connect the wire ropes of the No. 5 winch, the No. 6 winch, and the No. 8 winch to the No. 5 cable pile, the No. 7 cable pile, and the No. 8 cable pile one by one, start the No. 6 winch and the No. 7 winch, adjust the relative position between the other end of the floating bridge body and the water side end of the shore cable-stayed bridge, and then start the No. 5 winch and the No. 8 winch to slowly pull the floating bridge body toward the shore cable-stayed bridge. During the process, the No. 6 winch and the No. 7 winch are used to correct the relative position of the floating bridge body and the shore cable-stayed bridge at any time; Step 4: After the end face of the other end of the floating bridge body and the end face of the water side end of the shore-connected cable-stayed bridge are completely close together, first install the pin bolts between the matching piece of the other end of the floating bridge body and the matching piece of the water side end of the shore-connected cable-stayed bridge; then weld the seam between the other end of the floating bridge body and the water side end of the shore-connected cable-stayed bridge; Step 5: Remove all matching parts, winches No. 5 to No. 8, and cable piles No. 5 to No. 8; Process seven: Connect the main body of the pontoon to the mooring system; first connect one end of the mooring cable to the suction anchor, and after the floating pier is towed to the predetermined position, connect the mooring cable to the towing chain on the floating pier, and tension the mooring cable to the designed pre-tension through a winch or hoist.

2. The construction process of the floating bridge as claimed in claim 1, characterized in that: The first step of the process includes the following steps: Step 1: Set up an assembly cradle on land near the water, with the length of the assembly cradle perpendicular to the shoreline and no less than the length of a single-span floating bridge; install a pair of sliding rails on the top surface of the assembly cradle, and install a number of walking jacks and a gantry crane at intervals on the pair of sliding rails; set a lower step at the front end of the assembly cradle, and install a step jack on the top surface of the lower step. When the step jack is fully retracted, the height difference between it and the top of the assembly cradle is greater than the free deflection height of the tail of the main beam segment of the floating bridge unit in the floating state; Step 2: Use a gantry crane to hoist several main beam units onto the assembly cradle, and use the walking jacks on the assembly cradle to adjust the spatial position of the main beam units to complete the section-by-section splicing of the first half of the main beam segment, and install the first pier column head on the middle bottom surface of the first half of the main beam segment; Step 3: After the assembly of the front half of the main beam segment is completed, the front half of the main beam segment is pushed forward by a walking jack until the front of the front half of the main beam segment is suspended in the air, and the suspended length is adapted to the length of a main beam unit section; Step 4: First, tow the temporary floating pier to the bottom of the front end of the front half main beam segment; the temporary floating pier consists of a barge and a steel support; the barge is moored with its longitudinal direction perpendicular to the length direction of the assembled tire frame; the steel support includes two groups of steel pipe piles fixed to the deck of the barge at intervals along the longitudinal direction of the barge, two groups of longitudinal steel sections fixed one-to-one to the top of the two groups of steel pipe piles, and two floating pier jacks installed one-to-one on the top surfaces of the two groups of longitudinal steel sections; then, lift the two floating pier jacks to put force on the temporary floating pier; Step 5: Continue to use the walking jacks on the assembly cradle to gradually push the front half of the main beam segment forward. During the pushing process, gradually adjust the lifting height of the two floating pier jacks on the temporary floating pier to keep the vertical elevation of the front end of the front half of the main beam segment unchanged. The temporary floating pier also moves forward with the advancement of the front half of the main beam segment until the first pier head on the front half of the main beam segment is exposed from the lower step of the assembly cradle. Step 6: First, the first floating pier assembled on the water is towed to the bottom of the first pier column head, and then the pier column body on the first floating pier is welded to the first pier column head to complete the connection between the first floating pier and the first half of the main beam segment; Step 7: First, assemble the rear half of the main beam segment on the assembly frame according to the method of step 2, and connect the front end of the rear half of the main beam segment with the rear end of the front half of the main beam segment; Step 8: Use the walking jack on the assembly frame to continue pushing the rear half of the main beam segment forward until the second pier head on the rear half of the main beam segment is exposed on the lower step of the assembly frame; Step 9: Connect the second floating pier to the rear half of the main beam segment according to the method in step 6. At this point, the assembly of the floating bridge unit is complete. Step 10: Use the walking jack on the assembly frame to continue pushing the rear half of the main beam segment forward until the tail of the rear half of the main beam segment reaches the lower step of the assembly frame; Step 11: Lower the step jack on the lower step, that is, lower the support height of the lower step, so as to lower the elevation of the tail of the rear half main beam segment until the tail of the rear half main beam segment is completely in a free deflection state and completely disengaged from the step jack; Step 12: first remove the temporary floating pier, and then tow the floating bridge unit floating on the water out of the assembly site.

3. The construction process of the floating bridge as claimed in claim 1, characterized in that: When carrying out process 2, the following steps are included: Step 1: Set up a jacking support on the water, which includes 16 steel pipe columns. The 16 steel pipe columns are arranged in four rows in the longitudinal direction of the bridge and in four rows in the transverse direction of the bridge; the height of the first row of steel pipe columns is equal to the height of the fourth row of steel pipe columns, and the height of the second row of steel pipe columns is equal to the height of the third row of steel pipe columns and is greater than the height of the first row of steel pipe columns; place a walking jack on the top surface of the first row of steel pipe columns and the top surface of the fourth row of steel pipe columns respectively; stack sliding supports and support blocks in sequence on the top surface of the second row of steel pipe columns; and place support blocks on the top surface of the third row of steel pipe columns; Step 2: The tugboat tows the two sections of the floating bridge into the working range of the jacking support; Step 3: First, place the butt joints of the main beam segments of the two floating bridge units on the top of the first row of steel pipe columns and the top of the fourth row of steel pipe columns on the jacking brackets one by one, then start the vertical cylinders of the walking jacks on the top of the first row of steel pipe columns and the vertical cylinders of the walking jacks on the top of the fourth row of steel pipe columns to lift the butt joints of the two main beam segments one by one, and then use the lateral displacement function of the walking jacks to preliminarily adjust the lateral positions of the two main beam segments; Step 4: Start the longitudinal displacement function of the walking jack to drag the two sections of the floating bridge toward the middle of the jacking bracket; Step 5: When the end faces of the butt joints of the main beam segments of the two floating bridge units extend beyond the second row of steel pipe columns and the third row of steel pipe columns one by one, slowly lower the vertical cylinder of the walking jack so that the butt joints of the two main beam segments fall one by one on the support pads on the top of the second row of steel pipe columns and the support pads on the top of the third row of steel pipe columns, and continue to lower the vertical cylinder of the walking jack until the floating bridge units above are completely emptied, so that the weight of the butt joints of the two main beam segments is completely borne by the support pads on the top of the second row of steel pipe columns and the support pads on the top of the third row of steel pipe columns one by one; Step 6: Install several longitudinal pulling and closing oil cylinders with extended piston rods at intervals between the top surfaces of the butt joints of the two main beam segments, and control the retraction of the piston rods of the several longitudinal pulling and closing oil cylinders. At this time, the floating bridge unit located above the third row of steel pipe columns remains fixed, and the floating bridge unit located above the second row of steel pipe columns moves with the sliding support, further pulling the end surfaces of the butt joints of the two main beam segments together, and using the expansion and contraction of the longitudinal pulling and closing oil cylinders to fine-tune the longitudinal relative positions, so that the gap width between the end surfaces of the butt joints of the two main beam segments meets the design requirements; Step 7: Install a number of transverse fine-tuning cylinders at intervals between the top surfaces of the butt joints of the two main beam segments. Adjust the transverse positions of the two main beam segments through the transverse fine-tuning cylinders. After the axes of the two main beam segments are adjusted into place, weld a number of sets of limit steel plates on the top surfaces of the butt joints of the two main beam segments to limit the transverse displacement between the two main beam segments, thereby achieving precise transverse relative positioning of the two main beam segments. Step 8: Welding horse plates around the end faces of the butt joints of the two main beam segments to complete the welding work between the end faces of the butt joints of the two main beam segments to form a floating bridge unit; Step 9: Remove all longitudinal tensioning cylinders, transverse fine adjustment cylinders, limit steel plates and horse plates; Step 10: First, lift the vertical cylinders of the walking jacks on the top of the first row of steel pipe columns and the vertical cylinders of the walking jacks on the top of the fourth row of steel pipe columns to make the support blocks on the top of the second row of steel pipe columns and the support blocks on the top of the third row of steel pipe columns clear of the pontoon unit, and then remove all the support blocks; Step 11: Control the vertical oil cylinders of the walking jacks on the top of the first row of steel pipe columns and the vertical oil cylinders of the walking jacks on the top of the fourth row of steel pipe columns to retract, so that the floating bridge unit deflects downward under the action of its own weight, and the vertical oil cylinders of the straight walking jacks completely detach from the floating bridge unit; Step 12: Use a tugboat to drag the pontoon unit laterally to move the pontoon unit out of the working range of the jacking support.

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