Floating incremental launching and assembling method for floating bridge

Abstract

A floating incremental launching and assembling method for a floating bridge, comprising the following steps: erecting an assembly jig (2) on land near the water; assembling a front-half main girder section (10) on the assembly jig (2); incrementally launching the front-half main girder section (10) forward until the front portion of the front-half main girder section (10) is suspended in the air; supporting the front end of the front-half main girder section (10) by using a temporary floating pier (3); continuing to incrementally launch the front-half main girder section (10) forward until a first pier column head (120) is exposed out of a lower step (20) of the assembly jig (2); completing mounting of a first permanent floating pier (1A); assembling a rear-half main girder section (10') on the assembly jig (2); incrementally launching the rear-half main girder section (10') forward until the position of a second pier column head (120) is exposed out of the lower step (20); completing mounting of a second permanent floating pier (1A'); continuing to incrementally launch the rear-half main girder section (10') forward until the tail portion of the rear-half main girder section (10') reaches the lower step (20); and lowering a step jack (29), such that the tail portion of the rear-half main girder section (10') is completely separated from the step jack (29).

Description

A floating push-up assembly method for a floating bridge Technical Field

[0001] The invention relates to a floating jacking assembly method for a 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] In the existing pontoon bridge construction process, a splicing structure is generally adopted, in which pontoon bridge connectors are provided between the pontoon bridge units, and the pontoon bridge connectors connect the pontoon bridge units to each other to form an integral pontoon bridge structure; however, the pontoon bridge units are connected to each other on the water surface, which will cause insufficient stability between the pontoon bridge units, making it difficult to form an effective connection and posing great construction difficulties. Therefore, how to improve the splicing accuracy between the pontoon bridge units is a key issue that needs to be urgently addressed.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a floating jacking assembly method for a floating bridge, which can overcome the disadvantage of poor assembly stability of a single floating bridge on water and effectively ensure the assembly accuracy of the main beam of the floating bridge.

[0007] The object of the present invention is achieved by providing a floating push-up assembly method for a floating bridge, which is used to assemble two spans of floating bridge into a single floating bridge section; each span of the floating bridge includes half a main beam segment and a permanent floating pier; the main beam segment is spliced ​​together from a plurality of main beam unit sections, and a pier head is installed in the middle of the bottom surface of each half main beam segment; the permanent floating pier includes a pontoon and a pier body connected between the top center of the pontoon and the pier head of the main beam segment; the assembly method comprises the following steps:

[0008] Step 1: Set up an assembly cradle on land near the water, the length direction of the assembly cradle is perpendicular to the shoreline, and the length of the assembly cradle is not less than the length of a single-span floating bridge; the assembly cradle includes steel pipe piles arranged in a plurality of rows and columns, a plurality of crossbeams correspondingly connected between the tops of the plurality of rows of steel pipe piles, a plurality of Bailey longitudinal beams installed on the plurality of crossbeams, a plurality of distribution beams arranged on the plurality of Bailey longitudinal beams, a pair of sliding rails installed on the plurality of distribution beams, a plurality of walking jacks installed at intervals on the pair of sliding rails, and a gantry crane installed on the pair of sliding rails; a lower step is provided at the front end of the assembly cradle, a step jack is installed on the top surface of the lower step, and when the step jack is fully retracted, the height difference between the top of the assembly cradle and the step jack is greater than the free deflection height of the tail of the main beam segment of the floating bridge unit in the floating state;

[0009] 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;

[0010] 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;

[0011] 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;

[0012] 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.

[0013] Step 6: First, the first permanent 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 permanent floating pier is welded to the first pier column head to complete the connection between the first permanent floating pier and the first half of the main beam segment;

[0014] 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;

[0015] 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;

[0016] Step 9: Connect the second permanent 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.

[0017] 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;

[0018] 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;

[0019] Step 12: first remove the temporary floating piers, and then tow the floating bridge unit floating on the water out of the assembly site;

[0020] Step 13: Repeat steps 2 to 12 to assemble the next section of the floating bridge unit.

[0021] In the above-mentioned floating jacking assembly method of the floating bridge, when performing step 2, the jacking height of the step jack is adapted to the jacking height of the walking jack.

[0022] In the above-mentioned floating jacking assembly method of the floating bridge, during step four, the vertical elevation of the front end of the front half main beam segment is adjusted by setting support blocks on the two floating pier jacks.

[0023] In the above-mentioned floating jacking assembly method of the floating bridge, when performing steps eight and ten, the temporary floating pier then moves forward along with half of the main beam segment.

[0024] The floating jacking assembly method for a floating bridge of the present invention has the following characteristics: an assembly cradle is erected on land near water, a lower step is provided at the front end of the assembly cradle, and main beam segments are assembled and pier caps are installed on the assembly cradle. The assembled main beam segments are then pushed onto the water using walking jacks provided on the assembly cradle. Temporary floating piers are provided on the water to support the front end of the main beam segments, and the temporary floating piers are controlled to move accordingly with the advancement of the main beam segments. Finally, the step jack provided on the lower step of the assembly cradle is retracted, allowing the tail of the main beam segment to be completely free to deflect downward and completely disengaged from the step jack, allowing the assembled floating bridge unit to float on the water and be easily towed to the floating bridge construction site by a tugboat. The present invention overcomes the disadvantage of poor stability in the assembly of floating bridge units on water and effectively ensures the assembly accuracy of the floating bridge main beams. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a side view of an assembled tire frame set up when performing step 1 of the present invention;

[0026] FIG2 is a schematic diagram of the state when performing step 2 of the present invention;

[0027] FIG3 is a schematic diagram of the state when performing step 4 of the present invention;

[0028] FIG3a is an elevation view of a temporary floating pier used when performing step 4 of the present invention;

[0029] FIG4 is a schematic diagram of the state when performing step six of the present invention;

[0030] FIG5 is a schematic diagram of the state when performing step seven of the present invention;

[0031] FIG6 is a schematic diagram of the state when performing step eight of the present invention;

[0032] FIG7 is a schematic diagram of the state when performing step nine of the present invention;

[0033] FIG8 is a schematic diagram of the state when performing step 10 of the present invention;

[0034] FIG9 is a schematic diagram of the state when performing step 11 of the present invention;

[0035] FIG10 is a schematic diagram showing the state of step 12 of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] Referring to Figures 1 to 10, the floating jacking assembly method of the floating bridge of the present invention is used to assemble two spans of floating bridges into a 250m long floating bridge unit 100; each span of the floating bridge includes half a main beam segment 10 and a permanent floating pier 1A; the main beam segment 10 is spliced ​​together by a number of main beam unit sections, and a pier head 120 is installed in the middle of the bottom surface of each half main beam segment 10; the permanent floating pier 1A includes a pontoon 11 and a pier column body 12 connected between the top center of the pontoon 11 and the pier head 120 on the main beam segment 10.

[0038] The floating jacking assembly method of the floating bridge of the present invention comprises the following steps:

[0039] Step 1: Set up an assembly frame 2 on land near the water. The length of the assembly frame 2 is perpendicular to the shoreline and the length of the assembly frame 2 is not less than the length of a single-span floating bridge. The assembly frame 2 includes steel pipe piles 21 arranged in five rows and multiple columns, five crossbeams (double H-shaped steels) 22 correspondingly connected between the tops of the five rows of steel pipe piles 21, multiple Bailey longitudinal beams 23 installed on the five crossbeams 22, multiple distribution beams 24 arranged on the multiple Bailey longitudinal beams 23, a pair of sliding rails 25 installed on the multiple distribution beams 24, four walking jacks 26 installed at intervals on the pair of sliding rails 25, and a gantry crane 27 installed on the pair of sliding rails 25. Cross-connecting steel pipes and diagonal bracing channels are arranged between the five rows of steel pipe piles 21. A lower step 20 is provided at the front end of the assembly cradle 2. The lower step 20 comprises lower step steel pipe piles 21' arranged in two rows and two columns, two lower step longitudinal beams 23' (double H-shaped steel) correspondingly arranged on the top surfaces of the two rows of lower step steel pipe piles 21', and a lower step platform 28 provided on the two lower step longitudinal beams 23'. A step jack 29 is installed on the lower step platform 28. When the step jack 29 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 10 of the floating bridge unit 100 in the floating state (see Figure 1).

[0040] Step 2: Use the gantry crane 27 to hoist several main beam unit sections onto the assembly cradle 2, and use the walking jacks 26 on the assembly cradle 2 to adjust the spatial position of the main beam unit sections. The lifting height of the step jacks 29 is adapted to the lifting height of the walking jacks 26 to complete the section-by-section splicing of the front half main beam segment 10, and install the first pier head 120 on the middle bottom surface of the front half main beam segment 10 (see Figure 2);

[0041] Step 3: After the assembly of the front half of the main beam segment 10 is completed, the walking jack 26 is used to push the front half of the main beam segment 10 forward until the front part of the front half of the main beam segment 10 is suspended in the air, and the suspended length is adapted to the length of one main beam unit section;

[0042] Step 4: First, the temporary floating pier 3 is towed to the bottom of the front end of the front half main beam segment 10 (see Figure 3); the temporary floating pier 3 is composed of a barge 3A and a steel support 3B; the barge 3A is moored in a manner that its longitudinal direction is perpendicular to the length 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 one-to-one on the top of the two groups of steel pipe piles 31, and two floating pier jacks 33 installed one-to-one on the top surfaces of the two groups of longitudinal steel sections 32 (see Figure 3a); each group of steel pipe piles 31 is composed of three steel pipe piles 31, and cross-connecting steel pipes and diagonal bracing channel steels are arranged between the three steel pipe piles 31; then the two floating pier jacks 33 are lifted to make the temporary floating pier 3 bear force, that is, the two floating pier jacks 33 are supported on the front end of the front half main beam segment 10;

[0043] Step 5: Continue to use the walking jacks 26 on the assembly cradle 2 to gradually push the front half of the main beam segment 10 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 10 unchanged. Alternatively, the vertical elevation of the front end of the front half of the main beam segment 10 can be adjusted by setting support blocks on the two floating pier jacks 33. The temporary floating pier 3 also moves forward with the advancement of the front half of the main beam segment 10 until the first pier head 120 on the front half of the main beam segment 10 is exposed from the lower step 20 of the assembly cradle 2.

[0044] Step 6: First, the upper part of the first permanent floating pier assembled on the water is towed to the bottom of the first pier head 120, and then the pier body 12 on the first permanent floating pier 1A is welded to the first pier head 120 to complete the connection between the first permanent floating pier 1A and the front half of the main beam segment 10 (see Figure 4);

[0045] Step 7: First, assemble the rear half of the main beam segment 10' 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 10' to the rear end of the front half of the main beam segment 10 (see Figure 5);

[0046] Step 8: Use the walking jack 26 on the assembly jig 2 to continue pushing the rear half main beam segment 10' forward. The temporary floating pier 3 also moves forward with the advancement of the rear half main beam segment 10' until the second pier head 120 on the rear half main beam segment 10' is exposed from the lower step 20 of the assembly jig 2 (see Figure 6);

[0047] Step 9: Connect the second permanent floating pier 1A' and the rear half of the main beam segment 10' according to the method of step 6. At this point, the floating bridge unit 100 is assembled (see Figure 7).

[0048] Step 10: Use the walking jack 26 on the assembly jig 2 to continue pushing the rear half main beam segment 10' forward. The temporary floating pier 3 also moves forward with the advancement of the rear half main beam segment 10' until the tail of the rear half main beam segment 10' reaches the lower step 20 of the assembly jig 2 (see Figure 8);

[0049] Step 11: Lower the step jack 29 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 end of the rear half main beam segment 10', until the tail end of the rear half main beam segment 10' is completely in a free deflection state and completely separated from the step jack 29 (see Figure 9);

[0050] Step 12: first remove the temporary floating pier 3 to allow the assembled floating bridge unit 100 to float on the water surface (see FIG10 ), and then tow the floating floating bridge unit 100 out of the assembly site;

[0051] In step 13, repeat steps 2 to 12 to proceed to assembling the next section of the floating bridge unit. The above embodiments are only for the purpose of illustrating the present invention and are not intended to limit the present invention. Those skilled in the relevant technical field 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 floating jacking and assembling method for a floating bridge, which is used to assemble two spans of the floating bridge into a floating bridge monomer; each span of the floating bridge includes a half-main girder segment and a permanent floating pier; the main girder segment is spliced by a number of main girder unit segments, and a pier head is installed in the middle of the bottom surface of each half-main girder segment; the permanent floating pier includes a floating barrel and a pier column body connected between the center of the top surface of the floating barrel and the pier head of the main girder segment; it is characterized in that, The assembling method includes the following steps: Step 1: Set up an assembling falsework on the land near the water. The length direction of the assembling falsework is perpendicular to the shoreline, and the length of the assembling falsework is not less than the length of a single-span floating bridge. The assembling falsework includes steel pipe piles arranged in several rows and several columns, crossbeams respectively spanning between the tops of several rows of steel pipe piles, multiple Bailey longitudinal beams installed on several crossbeams, distribution beams arranged on multiple Bailey longitudinal beams, a pair of sliding tracks installed on multiple distribution beams, several walking jacks installed at intervals on a pair of sliding tracks, and a gantry crane installed on a pair of sliding tracks. A lower step is provided at the front end of the assembling falsework, and a step jack is installed on the top surface of the lower step. When the step jack is fully retracted, the height difference from the top of the assembling falsework is greater than the free deflection height of the tail of the main beam section of the floating bridge monomer in the floating state. Step 2: Use the gantry crane to hoist and place several main beam unit sections onto the assembling falsework, and use the walking jacks on the assembling falsework to adjust the spatial position of the main beam unit sections, complete the joint-by-joint splicing of the first half of the main beam section, and install the first pier head on the middle bottom surface of the first half of the main beam section. Step 3: After completing the assembly of the first half of the main beam section, use the walking jacks to push the first half of the main beam section forward until the front part of the first half of the main beam section is suspended, 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 lower part of the front end of the first half of the main beam section. The temporary floating pier consists of a barge and a steel section support. The barge is moored with its longitudinal direction perpendicular to the length direction of the assembling falsework. The steel section support includes two groups of steel pipe piles fixed on the deck of the barge at intervals along the longitudinal direction of the barge, two groups of longitudinal steel sections respectively fixed on the tops of the two groups of steel pipe piles, and two floating pier jacks respectively installed on the top surfaces of the two groups of longitudinal steel sections. Then, jack up the two floating pier jacks to make the temporary floating pier bear force. Step 5: Continue to use the walking jacks on the assembling falsework to gradually push the first half of the main beam section forward. During the pushing process, gradually adjust the jacking height of the two floating pier jacks on the temporary floating pier so that the vertical elevation at the front end of the first half of the main beam section remains unchanged, and the temporary floating pier also moves forward as the first half of the main beam section advances until the first pier head on the first half of the main beam section exposes the lower step of the assembling falsework. Step 6: First, tow the first permanent floating pier assembled on the water to the lower part of the first pier head, and then weld the pier column body on the first permanent floating pier to the first pier head to complete the connection between the first permanent floating pier and the first half of the main beam section. Step 7: First, assemble the second half of the main beam section on the assembling falsework according to the method in Step 2, and connect the front end of the second half of the main beam section to the rear end of the first half of the main beam section. Step 8: Use the walking jacks on the assembling falsework to continue pushing the second half of the main beam section forward until the position of the second pier head on the second half of the main beam section exposes the lower step of the assembling falsework. Step 9: Connect the second permanent floating pier and the second half of the main girder segment in the same way as in Step 6; thus, the assembly of a single floating bridge unit is completed. Step 10: Use the walking jack on the assembly jig to continue pushing the second half of the main girder segment forward until the tail of the second half of the main girder segment reaches the lower step of the assembly jig. Step 11: Lower the step jack on the lower step, i.e., reduce the support height at the lower step, to lower the elevation of the tail of the second half of the main girder segment until the tail of the second half of the main girder segment is completely in a freely deflected state and completely disengages 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. Step 13: Repeat Steps 2 to 12 to start the assembly of the next floating bridge unit.

2. The floating jacking and assembling method of the floating bridge according to claim 1, characterized in that, When performing Step 2, the jacking height of the step jack is adapted to the jacking height of the walking jack.

3. The floating jacking and assembling method of the floating bridge according to claim 1, wherein, When performing Step 4, adjust the vertical elevation of the front end of the first half of the main girder segment by setting support pads on the two floating pier jacks.

4. The floating jacking and assembling method of the floating bridge according to claim 1, characterized in that, When performing Steps 8 and 10, the temporary floating pier also moves forward as the second half of the main girder segment advances.

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