A floating push-up assembly method for a floating bridge

Abstract

The invention discloses a floating push assembly method for a floating bridge, comprising the following steps: setting up an assembly frame on land near water; assembling the front half of the main beam segment on the assembly frame; pushing the front half of the main beam segment forward until the front part of the front half of the main beam segment is suspended; using a temporary floating pier to support the front end of the front half of the main beam segment; continuing to push the front half of the main beam segment forward gradually until the first pier column head is exposed to the lower step of the assembly frame; completing the installation of the first permanent floating pier; assembling the back half of the main beam segment on the assembly frame; pushing the back half of the main beam segment forward until the second pier column head is exposed to the lower step; completing the installation of the second permanent floating pier; continuing to push the back half of the main beam segment forward until the tail of the back half of the main beam segment reaches the lower step; lowering the step jack so that the tail of the back half of the main beam segment is completely separated from the step jack. The invention overcomes the disadvantage of poor stability of the single assembly of the floating bridge on water.

Description

Technical Field

[0001] The invention relates to a floating jacking assembly method for a floating bridge. Background Art

[0002] In the past 30 years, floating bridges have been applied to modern infrastructure construction. Their technology has developed rapidly and gradually matured, and can be used as an important part of modern infrastructure. However, compared with land bridges including cable-stayed bridges and suspension bridges, the current data on floating bridges is still very limited, especially the data on construction records, environmental conditions, durability, operation and performance of floating bridges. At present, the number of long floating bridges in the world is very limited, 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 floating bridge construction process, a splicing structure is generally adopted. A floating bridge connector is arranged between the floating bridge units. The floating bridge connector connects the floating bridge units to each other to form an integral floating bridge structure. However, the floating bridge units are connected to each other on the water surface, which will cause insufficient stability between the floating bridge units, making it difficult to form an effective connection, and there are great construction difficulties. Therefore, how to improve the splicing accuracy between the floating bridge units is a key issue that needs to be solved urgently. Summary of the invention

[0005] 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.

[0006] The object of the present invention is achieved as follows: a floating push assembly method for a floating bridge, which is used to assemble two spans of floating bridges into a floating bridge monomer; each span of the floating bridge includes half a main beam segment and a permanent floating pier; the main beam segment is spliced ​​by a plurality of main beam unit sections, and a pier column head is installed in the middle of the bottom surface of each half main beam segment; the permanent floating pier includes a buoy and a pier column body connected between the top center of the buoy and the pier column head of the main beam segment; the assembly method includes the following steps:

[0007] Step 1: erect an assembly frame on land near the water, the length direction of the assembly frame is perpendicular to the shoreline, and the length of the assembly frame is not less than the length of a single-span floating bridge; the assembly frame includes steel pipe piles arranged in a plurality of rows and columns, a plurality of crossbeams correspondingly spanning 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 a pair of sliding rails, and a gantry crane installed on a pair of sliding rails; a lower step is provided at the front end of the assembly frame, a step jack is installed on the top surface of the lower step, and the height difference between the step jack and the assembly frame when fully retracted is greater than the free downward deflection height of the tail of the main beam segment of the floating bridge monomer in the floating state;

[0008] Step 2: Use a gantry crane to hoist several main beam unit sections onto the assembly frame, and use the walking jack on the assembly frame to adjust the spatial position of the main beam unit sections, 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;

[0009] 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 part 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;

[0010] Step 4: First, the temporary floating pier is towed to the bottom of the front end of the front half main beam segment; the temporary floating pier is composed of a barge and a steel support; the barge is moored in a manner that its longitudinal direction is perpendicular to the length direction of the assembled tire frame; the steel 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 fixed one-to-one on 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 the two floating pier jacks are lifted to make the temporary floating pier bear force;

[0011] Step 5: Continue to use the walking jack on the assembly frame 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 frame.

[0012] 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;

[0013] 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;

[0014] 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 position on the rear half of the main beam segment is exposed from the lower step of the assembly frame;

[0015] 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 a floating bridge unit has been completed;

[0016] Step 10, using 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;

[0017] Step eleven, lowering the step jack on the lower step, that is, lowering the support height at 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 separated from the step jack;

[0018] Step 12: first remove the temporary floating pier, and then tow the floating bridge unit floating on the water out of the assembly site;

[0019] Step 13: Repeat steps 2 to 12 to assemble the next section of the floating bridge.

[0020] In the above-mentioned floating jacking assembly method of the floating bridge, when performing step 2, the lifting height of the step jack is adapted to the lifting height of the walking jack.

[0021] 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 pads on the two floating pier jacks.

[0022] In the above-mentioned floating jacking assembly method of a floating bridge, when performing steps eight and ten, the temporary floating pier then moves forward along with half of the main beam segment.

[0023] The floating push assembly method of the floating bridge of the present invention has the following characteristics: an assembly frame is set up on land near the water, a lower step is set at the front end of the assembly frame, the main beam segments can be spliced ​​section by section on the assembly frame and the pier column head can be installed, and then the assembled main beam segments are pushed onto the water by the walking jacks arranged on the assembly frame, and temporary floating piers are arranged 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 tail of the main beam segment is completely in a free deflection state and completely separated from the step jack by the retraction of the step jack arranged on the lower step of the assembly frame, so that a section of the assembled floating bridge monomer can float on the water, which is convenient for being towed to the floating bridge construction site by a tugboat. The present invention overcomes the disadvantage of poor assembly stability of floating bridge monomers on water, and effectively ensures the assembly accuracy of the floating bridge main beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a side view of an assembled tire frame set up when performing step 1 of the present invention;

[0025] Figure 2 It is a schematic diagram of the state when performing step 2 of the present invention;

[0026] Figure 3 is a schematic diagram of the state when performing step 4 of the present invention;

[0027] Figure 3a is a elevation view of a temporary floating pier used when performing step 4 of the present invention;

[0028] Figure 4 is a schematic diagram of the state when performing step 6 of the present invention;

[0029] Figure 5 is a schematic diagram of the state when performing step seven of the present invention;

[0030] Figure 6 is a schematic diagram of the state when performing step eight of the present invention;

[0031] Figure 7 is a schematic diagram of the state when performing step nine of the present invention;

[0032] Figure 8 is a schematic diagram of the state when performing step ten of the present invention;

[0033] Fig. 9 is a schematic diagram of the state when performing step 11 of the present invention;

[0034] Fig.10 It is a schematic diagram of the state when performing step twelve of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] See also Figures 1 to 10 The floating jacking assembly method of the floating bridge of the present invention is used to assemble two-span floating bridges into a 250m long floating bridge monomer 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 ​​by a plurality of main beam unit sections, and a pier column 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 surface center of the pontoon 11 and the pier column head 120 on the main beam segment 10.

[0037] The floating jacking assembly method of the floating bridge of the present invention comprises the following steps:

[0038] Step 1: Set up an assembly frame 2 on land near the water. The length direction 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 cross beams (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 cross beams 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 on the pair of sliding rails 25 at intervals, and a jack installed on the pair of sliding rails. 25 on the gantry crane 27; between the five rows of steel pipe piles 21 are arranged cross-connecting steel pipes and diagonal bracing channel steel; a lower step 20 is arranged at the front end of the assembly tire frame 2, the lower step 20 includes lower step steel pipe piles 21 'arranged in two rows and two columns, two lower step longitudinal beams 23 '(double H-shaped steel) arranged on the top surface of the two rows of lower step steel pipe piles 21 'one by one and a lower step platform 28 arranged on the two lower step longitudinal beams 23 ', and a step jack 29 is installed on the lower step platform 28; the step jack 29 is completely retracted. The height difference between the top of the assembly tire frame 2 is greater than the free deflection height of the tail of the main beam segment 10 of the floating bridge monomer 100 in the floating state (see Figure 1 );

[0039] Step 2: Use the gantry crane 27 to place several main beam unit sections on the assembly frame 2, and use the walking jack 26 on the assembly frame 2 to adjust the spatial position of the main beam unit section. The lifting height of the step jack 29 is adapted to the lifting height of the walking jack 26, and the first half of the main beam segment 10 is spliced ​​section by section, and the first pier column head 120 is installed on the middle bottom surface of the first half of the main beam segment 10 (see Figure 2 );

[0040] Step 3: After the assembly of the front half of the main beam segment 10 is completed, the front half of the main beam segment 10 is pushed forward by the walking jack 26 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 a main beam unit section;

[0041] 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 a cross-connecting steel pipe and a diagonal bracing channel steel are arranged between the three steel pipe piles 31; and then two floating pier jacks 33 are lifted to make the temporary floating pier 3 bear force, even if the two floating pier jacks 33 are supported on the front end of the front half of the main beam segment 10;

[0042] Step 5: Continue to use the walking jack 26 on the assembly frame 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. The vertical elevation of the front end of the front half of the main beam segment 10 can also be adjusted by setting support pads 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 column head 120 on the front half of the main beam segment 10 is exposed from the lower step 20 of the assembly frame 2;

[0043] 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 column head 120, and then the pier column body 12 on the first permanent floating pier 1A is welded to the first pier column head 120 to complete the connection between the first permanent floating pier 1A and the front half main beam segment 10 (see FIG. Figure 4 );

[0044] 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 );

[0045] Step 8: Use the walking jack 26 on the assembly frame 2 to continue pushing the rear half main beam segment 10' forward, and the temporary floating pier 3 moves forward along with the advancement of the subsequent half main beam segment 10' until the second pier column head 120 on the rear half main beam segment 10' is exposed from the lower step 20 of the assembly frame 2 (see FIG. Figure 6 );

[0046] 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, a floating bridge monomer 100 has been assembled (see Figure 7 );

[0047] Step 10: Use the walking jack 26 on the assembly frame 2 to continue pushing the rear half of the main beam segment 10' forward, and the temporary floating pier 3 moves forward along with the advancement of the subsequent half of the main beam segment 10' until the tail of the rear half of the main beam segment 10' reaches the lower step 20 of the assembly frame 2 (see Figure 8 );

[0048] Step 11: Lower the step jack 29 on the lower step 20, that is, lower the support height at the lower step 20, so as to lower the elevation of the tail of the rear half main beam segment 10', until the tail of the rear half main beam segment 10' is completely in a free deflection state and completely separated from the step jack 29 (see FIG. Fig. 9 );

[0049] Step 12: first remove the temporary floating pier 3, so that the assembled floating bridge unit 100 floats on the water surface (see Fig.10 ), and then towing the floating bridge monomer 100 floating on the water surface out of the assembly site;

[0050] Step 13: Repeat steps 2 to 12 to assemble the next section of the floating bridge.

[0051] The above embodiments are only used to illustrate the present invention, rather than 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 belong to the scope of the present invention and should be defined by the claims.

Claims

1. A floating push assembly method for a floating bridge, used for assembling two-span floating bridges into a floating bridge monomer; each span of the floating bridge comprises half a main beam segment and a permanent floating pier; the main beam segment is spliced ​​by a plurality of main beam unit sections, and a pier column head is installed in the middle of the bottom surface of each half main beam segment; the permanent floating pier comprises a buoy and a pier column body connected between the top center of the buoy and the pier column head of the main beam segment; characterized in that, The assembling method comprises the following steps: Step 1: erect an assembly frame on land near the water, the length direction of the assembly frame is perpendicular to the shoreline, and the length of the assembly frame is not less than the length of a single-span floating bridge; the assembly frame includes steel pipe piles arranged in a plurality of rows and columns, a plurality of crossbeams correspondingly spanning 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 a pair of sliding rails, and a gantry crane installed on a pair of sliding rails; a lower step is provided at the front end of the assembly frame, a step jack is installed on the top surface of the lower step, and the height difference between the step jack and the assembly frame when fully retracted is greater than the free downward deflection height of the tail of the main beam segment of the floating bridge monomer in the floating state; Step 2: Use a gantry crane to hoist several main beam unit sections onto the assembly frame, and use the walking jack on the assembly frame to adjust the spatial position of the main beam unit sections, 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 part 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, the temporary floating pier is towed to the bottom of the front end of the front half main beam segment; the temporary floating pier is composed of a barge and a steel support; the barge is moored in a manner that its longitudinal direction is perpendicular to the length direction of the assembled tire frame; the steel 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 fixed one-to-one on 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 the two floating pier jacks are lifted to make the temporary floating pier bear force; Step 5: Continue to use the walking jack on the assembly frame 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 frame. 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; 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 position on the rear half of the main beam segment is exposed from the lower step of the assembly frame; 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 a floating bridge unit has been completed; Step 10, using 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 eleven, lowering the step jack on the lower step, that is, lowering the support height at 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 separated 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 assemble the next section of the floating bridge unit.

2. The floating jacking assembly method of a floating bridge according to claim 1 is characterized in that: When performing step 2, the lifting height of the step jack is adapted to the lifting height of the walking jack.

3. The floating jacking assembly method of a floating bridge according to claim 1 is characterized in that: When performing step 4, the vertical elevation of the front end of the front half main beam segment is adjusted by setting support pads on the two floating pier jacks.

4. The floating jacking assembly method of a floating bridge according to claim 1 is characterized in that: When performing step eight and step ten, the temporary floating pier then moves forward along with the advancement of half of the main beam segment.

Images