A method for on-water docking of a single pontoon

Abstract

The present invention discloses a method for water docking of a single pontoon bridge unit, comprising the following steps: erecting a jacking support on water; towing two single pontoon bridge units to the working range of the jacking support; preliminarily adjusting the docking joints of the main beam segments of the two single pontoon bridge units on the jacking support; dragging the two single pontoon bridge units towards the middle of the jacking support by the walking jacks on the jacking support; bearing the weight of the docking joints of the two main beam segments by the supporting pads on the jacking support; further closing the docking joints of the two main beam segments by the longitudinal closing oil cylinders; adjusting the transverse positions of the docking joints of the two main beam segments by the transverse fine-adjustment oil cylinders; completing the welding work between the end faces of the docking joints of the two main beam segments to form a pontoon bridge unit; separating the jacking support from the pontoon bridge unit by the walking jacks; and towing the pontoon bridge unit away from the working range of the jacking support. The present invention effectively ensures that the force and deformation of the single pontoon bridge unit during docking meet the design requirements.

Description

Technical Field

[0001] The present invention relates to a method for waterborne docking of a single pontoon bridge unit. Background Art

[0002] In the past 30 years, pontoon bridges have been applied to modern infrastructure construction. Their technology has developed rapidly and gradually become mature, and they can be used as an important part of modern infrastructure. However, compared with land bridges including cable-stayed bridges and suspension bridges, the information on pontoon bridges is still very limited, especially the construction records, environmental conditions, durability, operation and performance of pontoon bridges. At present, the number of long pontoon bridges in the world is very limited, only about 20.

[0003] Most of the pontoon bridges built abroad are of continuous buoy structure. In this type of pontoon bridge, the square buoys at the lower part are connected end to end to form a continuous floating body structure. The upper part of the buoy can directly bear the vehicle traffic load, or piers or frame structures can be set to raise the bridge deck elevation.

[0004] In the construction process of existing pontoon bridges, a splicing structure is generally adopted. There are pontoon bridge connectors between single pontoon bridge units. The pontoon bridge connectors connect the single pontoon bridge units to each other to form an integral pontoon bridge structure. A single pontoon bridge unit consists of a main beam section and two pontoons connected to the bottom surface of the main beam section at intervals. Since both ends of the main beam section are in a cantilever state, downward deflection will occur under the action of its own weight. In order to dock two single pontoon bridge units, direct docking will result in the elevation of the main beam not meeting the design requirements. Therefore, how to improve the docking accuracy between single pontoon bridge units is a key problem 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 method for waterborne docking of a single pontoon bridge unit, which effectively ensures that the force and deformation of the single pontoon bridge unit during docking meet the design requirements.

[0006] The purpose of the present invention is achieved as follows: A method for waterborne docking of a single pontoon bridge unit, which is used to dock two single pontoon bridge units into a pontoon bridge unit; each single pontoon bridge unit includes a main beam section and two pontoons connected to the bottom surface of the main beam section; the docking method includes the following steps:

[0007] Step 1: Erect a jacking support on the water. The jacking support includes sixteen steel pipe columns, which are arranged in four columns longitudinally along the bridge and four rows transversely across the bridge. The heights of the steel pipe columns in the first row are equal to those in the fourth row, and the heights of the steel pipe columns in the second row are equal to those in the third row and greater than the heights of the steel pipe columns in the first row. Place a walking jack on the top surface of the steel pipe columns in the first row and the top surface of the steel pipe columns in the fourth row respectively. Stack a sliding bearing and a support cushion block on the top surface of the steel pipe columns in the second row in sequence. Place a support cushion block on the top surface of the steel pipe columns in the third row.

[0008] Step 2: Use a tugboat to tow the two floating bridge units to the working range of the jacking support.

[0009] Step 3: First, place the docking joints of the main beam segments of the two floating bridge units on the tops of the steel pipe columns in the first row and the tops of the steel pipe columns in the fourth row of the jacking support respectively. Then, start the vertical cylinders of the walking jacks on the tops of the steel pipe columns in the first row and the vertical cylinders of the walking jacks on the tops of the steel pipe columns in the fourth row to jack up the docking ends of the two main beam segments correspondingly. Then, use the lateral displacement function of the walking jack to preliminarily adjust the lateral positions of the two main beam segments.

[0010] Step 4: Start the longitudinal displacement function of the walking jack and drag the two floating bridge units towards the middle of the jacking support.

[0011] Step 5: When the end faces of the docking joints of the main beam segments of the two floating bridge units exceed the steel pipe columns in the second row and the third row correspondingly, slowly lower the vertical cylinders of the walking jacks to make the docking joints of the two main beam segments fall on the support cushion blocks on the tops of the steel pipe columns in the second row and the support cushion blocks on the tops of the steel pipe columns in the third row correspondingly, and continue to lower the vertical cylinders of the walking jacks until the upper floating bridge units are completely disengaged, so that the weights of the docking joints of the two main beam segments are completely borne by the support cushion blocks on the tops of the steel pipe columns in the second row and the support cushion blocks on the tops of the steel pipe columns in the third row respectively.

[0012] Step 6: Install several longitudinal pulling cylinders with the piston rods extended at intervals between the top surfaces of the docking joints of the two main beam segments. Control the retraction of the piston rods of the several longitudinal pulling cylinders. At this time, the floating bridge unit above the third row of steel pipe columns remains fixed, and the floating bridge unit above the second row of steel pipe columns moves with the sliding bearing, further pulling and closing the end faces of the docking joints of the two main beam segments, and using the telescoping of the longitudinal pulling cylinders to finely adjust the longitudinal relative positions, so that the gap width between the end faces of the docking joints of the two main beam segments meets the design requirements.

[0013] Step 7: Install several transverse fine-tuning cylinders at intervals between the top surfaces of the docking joints of the two main girder segments. Adjust the transverse positions of the two main girder segments through the several transverse fine-tuning cylinders. After the axes of the two main girder segments are adjusted in place, weld several groups of limit steel plates on the top surfaces of the docking joints of the two main girder segments to limit the transverse displacement between the two main girder segments and achieve precise positioning of the transverse relative positions of the two main girder segments;

[0014] Step 8: Weld cleats around the end faces of the docking joints of the two main girder segments to complete the welding work between the end faces of the docking joints of the two main girder segments, forming a floating bridge unit;

[0015] Step 9: Remove all longitudinal pulling cylinders, transverse fine-tuning cylinders, limit steel plates, and cleats;

[0016] Step 10: First, jack up the vertical cylinders of the walking jacks on the top of the first row of steel pipe columns of the jacking support and the vertical cylinders of the walking jacks on the top of the fourth row of steel pipe columns, so that 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 are disengaged from the floating bridge unit, and then remove all the support pads;

[0017] Step 11: Control the retraction of 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. The floating bridge unit deflects downward under its own weight until the vertical cylinders of the walking jacks are completely disengaged from the floating bridge unit;

[0018] Step 12: Use tugboats to horizontally drag the floating bridge unit out of the working range of the jacking support.

[0019] In the above method for on-water docking of the floating bridge monomers, when performing Step 1, the distance between the first row of steel pipe columns and the second row of steel pipe columns is equal to the distance between the third row of steel pipe columns and the fourth row of steel pipe columns, and the distance between the second row of steel pipe columns and the third row of steel pipe columns is greater than the distance between the first row of steel pipe columns and the second row of steel pipe columns; the top height of the support pads is calculated to offset the downward deflection of the self-weight of the docking joints of the two floating bridge monomers.

[0020] In the above method for on-water docking of the floating bridge monomers, when performing Step 6, each of the longitudinal pulling cylinders is installed between the top surfaces of the docking joints of the two main girder segments through two pairs of brackets. One pair of brackets is installed on the top surface of one main girder segment, and the other pair of brackets is installed on the top surface of the other main girder segment. A pin shaft is connected between each pair of brackets, and the two ends of the longitudinal pulling cylinder are slidably sleeved on the two pin shafts in a one-to-one correspondence.

[0021] The above-mentioned method for waterborne docking of pontoon units, wherein, when performing step seven, each transverse fine adjustment oil cylinder is installed between the top surfaces of the docking joints of two main beam segments through two cross-bridge direction support steel plates welded to the top surfaces of the docking joints of two main beam segments in a one-to-one correspondence.

[0022] The above-mentioned method for waterborne docking of pontoon units, wherein, when performing step seven, each group of limit steel plates is composed of three steel plates arranged in a horizontal "pin" shape, that is, two steel plates are welded to the top surface of one main beam segment, and the other steel plate is welded to the top surface of the other main beam segment and clamped between the two opposite steel plates.

[0023] The method for waterborne docking of pontoon units of the present invention has the following characteristics: By erecting a jacking support on water and arranging a walking jack and a support pad on the jacking support, the two pontoon units are jacked to a reasonable position by the walking jack and the docking position of the two pontoon units is initially adjusted. Then, longitudinal pulling cylinders and transverse fine adjustment cylinders are arranged on the main beam segments of the two pontoon units to finely adjust the docking position of the two main beam segments, and then welding operations are carried out, solving the problem that the two ends of the main beam segments are in a cantilever state and will deflect under their own weight, affecting the docking accuracy, and effectively ensuring that the force and deformation of the pontoon units during docking meet the design requirements. Description of the Drawings

[0024] Figure 1 is a side view of the jacking support erected when performing step one of the present invention;

[0025] Figure 1a is Figure 1 the view in the direction of A-A in

[0026] Figure 1b is Figure 1 the view in the direction of B-B in

[0027] Figure 1c is Figure 1 the view in the direction of C-C in

[0028] Figure 2 is a plan view of the state when performing step two of the present invention;

[0029] Figure 2a is a side view of the state when performing step two of the present invention;

[0030] Figure 3 is a first side view of the state when performing step three of the present invention;

[0031] Figure 4 is a second side view of the state when performing step three of the present invention;

[0032] Figure 5It is a side view of the state when performing Step Five of the present invention;

[0033] Figure 6 It is a side view of the state when performing Step Six of the present invention;

[0034] Figure 6a It is a plan view of the state when performing Step Six of the present invention;

[0035] Figure 7 It is a side view of the state when performing Step Seven of the present invention;

[0036] Figure 8 It is a side view of the state when performing Step Eight of the present invention;

[0037] Figure 9 It is a side view of the state when performing Step Ten of the present invention;

[0038] Figure 10 It is a plan view of the state when performing Step Twelve of the present invention. Detailed Embodiment

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] Please refer to Figures 1 to 10 , the method for waterborne docking of the pontoon single body of the present invention is used to dock two pontoon single bodies 10 into a pontoon unit 100; each pontoon single body 10 includes a main girder segment 1A and two pontoons 1B connected to the bottom surface of the main girder segment 1A.

[0041] The method for waterborne docking of the pontoon single body of the present invention includes the following steps:

[0042] Step One, erect a jacking support 20 on the water. The jacking support 20 includes sixteen steel pipe columns, and the sixteen steel pipe columns are arranged in four columns longitudinally along the bridge and four rows transversely across the bridge; the distance between the first column of steel pipe columns and the second column of steel pipe columns is equal to the distance between the third column of steel pipe columns and the fourth column of steel pipe columns, and the distance between the second column of steel pipe columns and the third column of steel pipe columns is greater than the distance between the first column of steel pipe columns and the second column of steel pipe columns; the height of the first row of steel pipe columns 21 is equal to the height of the fourth row of steel pipe columns 24, and the height of the second row of steel pipe columns 22 is equal to the height of the third row of steel pipe columns 23 and is greater than the height of the first row of steel pipe columns 21; a section steel support 25 is arranged between adjacent steel pipe columns; a walking jack 2 is placed on the top surface of each of the first row of steel pipe columns 21 and the fourth row of steel pipe columns 24; a sliding support 30 and a support pad 3 are stacked in sequence on the top surface of the second row of steel pipe columns 22; a support pad 3 is placed on the top surface of the third row of steel pipe columns 23; the top height of the support pad 3 is obtained through calculation to offset the self-weight deflection of the docking joints of the two pontoon single bodies 10, so that the main girder segments 1A of the two pontoon single bodies 10 can be smoothly docked;

[0043] Step 2: Eight tugboats 200 tow the two pontoon units 10 to within the working range of the lifting brackets 20 (see Figure 2 and Figure 2a );

[0044] Step 3: First, place the docking joints of the main beam segments 1A of the two pontoon units 10 on top of the first row of steel pipe columns 21 and the fourth row of steel pipe columns 24 of the lifting brackets 20 one by one (see Figure 3 ). Then, start the vertical cylinders of the walking jacks 2 on top of the first row of steel pipe columns 21 and the vertical cylinders of the walking jacks 2 on top of the fourth row of steel pipe columns 24, and lift the docking ends of the two pontoon units 10 one by one. Then, use the lateral displacement function of the walking jacks 2 to preliminarily adjust the lateral positions of the two main beam segments 1A (see Figure 4 );

[0045] Step 4: Start the longitudinal displacement function of the walking jacks 2 on the top surfaces of the first row of steel pipe columns 21 and the walking jacks 2 on the top surfaces of the fourth row of steel pipe columns 24, and drag the two pontoon units 10 towards the middle of the lifting brackets 20;

[0046] Step 5: When the end faces of the docking joints of the main beam segments 1A of the two pontoon units 10 exceed the second row of steel pipe columns 22 and the third row of steel pipe columns 23 one by one, slowly lower the vertical cylinders of the walking jacks 2 on the top surfaces of the first row of steel pipe columns 21 and the vertical cylinders of the walking jacks 2 on the top surfaces of the fourth row of steel pipe columns 24, so that the docking joints of the two main beam segments 1A fall on the support pads 3 on top of the second row of steel pipe columns 22 and the support pads 3 on top of the third row of steel pipe columns 23 one by one, and continue to lower the vertical cylinders of the walking jacks 2 on the top of the first row of steel pipe columns 21 and the vertical cylinders of the walking jacks 2 on the top of the fourth row of steel pipe columns 24 until the upper pontoon units 10 are completely disengaged, so that the weights of the docking joints of the two main beam segments 1A are completely borne by the support pads 3 on top of the second row of steel pipe columns 22 and the support pads 3 on top of the third row of steel pipe columns 23 one by one (see Figure 5 );

[0047] Step 6: Install two longitudinally pulling cylinders 4 with piston rods extended at intervals between the top surfaces of the docking joints of the two main girder segments 1A. Each longitudinally pulling cylinder 4 is installed between the top surfaces of the docking joints of two pontoon bridge units 10 through two pairs of brackets 40. One pair of brackets 40 is installed on the top surface of one main girder segment 1A, and the other pair of brackets 40 is installed on the top surface of the other main girder segment 1A. A pin shaft is connected between each pair of brackets 40. The two ends of the longitudinally pulling cylinder 4 are slidably sleeved on the two pin shafts in a one-to-one correspondence. Control the piston rods of the two longitudinally pulling cylinders 4 to retract. At this time, the pontoon bridge unit 10 above the third row of steel pipe columns 23 remains fixed, and the pontoon bridge unit 10 above the second row of steel pipe columns 22 moves with the sliding support 30, further pulling and closing the end faces of the docking joints of the two main girder segments 1A, and finely adjusting the longitudinal relative position by using the telescoping of the longitudinally pulling cylinder 4 so that the gap width between the end faces of the docking joints of the two main girder segments 1A meets the design requirements (see Figure 6 and Figure 6a );

[0048] Step 7: Install two transversely fine-tuning cylinders 5 at intervals between the top surfaces of the docking joints of the two main girder segments 1A, and adjust the transverse positions of the two main girder segments 1A through the two transversely fine-tuning cylinders 5. Each transversely fine-tuning cylinder 5 is installed between the top surfaces of the docking joints of the two main girder segments 1A through two cross-bridge support steel plates 50 welded to the top surfaces of the docking joints of the two main girder segments 1A in a one-to-one correspondence. When the axes of the two main girder segments 1A are adjusted in place, weld two groups of limit steel plates 6 on the top surfaces of the docking joints of the two main girder segments 1A. Each group of limit steel plates 6 is composed of three steel plates arranged in a horizontal pin shape, that is, two steel plates are welded to the top surface of one main girder segment 1A, and the other steel plate is welded to the top surface of the other main girder segment 1A and clamped between the two opposite steel plates to limit the transverse displacement between the two pontoon bridge units 10 and achieve precise positioning of the transverse relative positions of the two pontoon bridge units 10 (see Figure 7 );

[0049] Step 8: Weld gusset plates around the end faces of the docking joints of the two main girder segments 1A to complete the welding work between the end faces of the docking joints of the two main girder segments 1A, forming a pontoon bridge unit 100 (see Figure 8 );

[0050] Step 9: Remove all tooling such as the longitudinally pulling cylinders 4, transversely fine-tuning cylinders 5, limit steel plates 6, and gusset plates;

[0051] Step 10: First, lift the vertical cylinders of the walking jacks 2 on the top of the first row of steel pipe columns 21 of the lifting support 20 and the vertical cylinders of the walking jacks 2 on the top of the fourth row of steel pipe columns 24 to make the support pads 3 on the top of the second row of steel pipe columns 22 and the support pads 3 on the top of the third row of steel pipe columns 23 lift off the pontoon bridge unit 100 (seeFigure 9 ), and then remove all the supporting pads 3;

[0052] Step Eleven: Control the vertical cylinders of the walking jacks 2 on top of the first row of steel pipe columns 21 and the vertical cylinders of the walking jacks 2 on top of the fourth row of steel pipe columns 24 to retract. The floating bridge unit deflects under its own weight until the vertical cylinders of the walking jacks 2 on top of the first row of steel pipe columns 21 and the vertical cylinders of the walking jacks 2 on top of the fourth row of steel pipe columns 24 are completely separated from the floating bridge unit 100;

[0053] Step Twelve: Use four tugboats 200 to horizontally drag the floating bridge unit 100 and tow the floating bridge unit 100 out of the working range of the jacking support 20 (see Figure 10 ).

[0054] The above embodiments are only for illustrating the present invention and not for limiting the present invention. Those skilled in the relevant technical fields can also make various transformations 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, which should be defined by each claim.

Claims

1. A method for water-based docking of a single pontoon bridge unit, which is used to dock two single pontoon bridge units into a pontoon bridge unit; each single pontoon bridge unit includes a main beam segment and two floating piers connected to the bottom surface of the main beam segment; characterized in that, The docking method includes the following steps: Step 1: Erect a jacking support on the water. The jacking support includes sixteen steel pipe columns, which are arranged in four columns longitudinally along the bridge and four rows transversely across the bridge. The heights of the steel pipe columns in the first row are equal to those in the fourth row, and the heights of the steel pipe columns in the second row are equal to those in the third row and greater than the heights of the steel pipe columns in the first row. Place a walking jack on the top surface of each of the steel pipe columns in the first row and the fourth row. Stack a sliding bearing and a support pad on the top surface of the steel pipe columns in the second row in sequence. Place a support pad on the top surface of the steel pipe columns in the third row. Step 2: Use tugs to tow the two floating bridge units to the working range of the jacking support. Step 3: First, place the docking joints of the main beam segments of the two floating bridge units respectively on the tops of the steel pipe columns in the first row and the fourth row of the jacking support. Then, start the vertical cylinders of the walking jacks on the tops of the steel pipe columns in the first row and the fourth row to jack up the docking ends of the two main beam segments respectively. 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 jacks to drag the two floating bridge units towards the middle of the jacking support. Step 5: When the end faces of the docking joints of the main beam segments of the two floating bridge units respectively exceed the steel pipe columns in the second row and the third row, slowly lower the vertical cylinders of the walking jacks to make the docking joints of the two main beam segments respectively land on the support pads on the tops of the steel pipe columns in the second row and the third row, and continue to lower the vertical cylinders of the walking jacks until they are completely separated from the floating bridge units above, so that the weights of the docking joints of the two main beam segments are respectively fully borne by the support pads on the tops of the steel pipe columns in the second row and the third row. Step 6: Install several longitudinal closing cylinders with pistons extended at intervals between the top surfaces of the docking joints of the two main beam segments. Control the pistons of the several longitudinal closing cylinders to retract. At this time, the floating bridge unit above the third row of steel pipe columns remains fixed, and the floating bridge unit above the second row of steel pipe columns moves with the sliding bearing, further closing and approaching the end faces of the docking joints of the two main beam segments, and using the extension and retraction of the longitudinal closing cylinders to finely adjust the longitudinal relative positions, so that the gap width between the end faces of the docking joints of the two main beam segments meets the design requirements. Step 7: Install several transverse fine adjustment cylinders at intervals between the top surfaces of the docking joints of the two main beam segments. Adjust the lateral positions of the two main beam segments through the several transverse fine adjustment cylinders. When the axes of the two main beam segments are adjusted in place, weld several groups of limit steel plates on the top surfaces of the docking joints of the two main beam segments to limit the lateral displacement between the two main beam segments and achieve the fine positioning of the lateral relative positions of the two main beam segments. Step 8: Weld gusset plates around the end face of the docking joint of two main girder segments, complete the welding work between the end faces of the docking joints of two main girder segments, and form a floating bridge unit. Step 9: Remove all longitudinal pulling cylinders, transverse fine-tuning cylinders, limit steel plates and gusset plates. Step 10: First, jack up the vertical cylinders of the walking jacks on the top of the first row of steel pipe columns of the jacking support and the vertical cylinders of the walking jacks on the top of the fourth row of steel pipe columns, so that 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 are separated from the floating bridge unit, and then remove all the support pads. Step 11: Control the retraction of 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. The floating bridge unit deflects downward under its own weight until the vertical cylinders of the walking jacks are completely separated from the floating bridge unit. Step 12: Use tugboats to horizontally drag the floating bridge unit out of the working range of the jacking support.

2. The method for water docking of the pontoon monomer according to claim 1, characterized in that, When performing Step 1, the distance between the first column of steel pipe columns and the second column of steel pipe columns is equal to the distance between the third column of steel pipe columns and the fourth column of steel pipe columns, and the distance between the second column of steel pipe columns and the third column of steel pipe columns is greater than the distance between the first column of steel pipe columns and the second column of steel pipe columns; the top height of the support pad is calculated to offset the downward deflection of the self-weight of the docking joints of two floating bridge monomers.

3. The method for on-water docking of a pontoon unit according to claim 1, characterized in that, When performing Step 6, each longitudinal pulling cylinder is installed between the top surfaces of the docking joints of two main girder segments through two pairs of brackets. One pair of brackets is installed on the top surface of one main girder segment, and the other pair of brackets is installed on the top surface of the other main girder segment. A pin shaft is connected between each pair of brackets, and both ends of the longitudinal pulling cylinder are slidably sleeved on the two pin shafts correspondingly.

4. The method for water docking of a single pontoon of a floating bridge according to claim 1, characterized in that, When performing Step 7, each transverse fine-tuning cylinder is installed between the top surfaces of the docking joints of two main girder segments through two cross-bridge support steel plates welded correspondingly on the top surfaces of the docking joints of two main girder segments.

5. The method for on-water docking of a pontoon unit according to claim 1, characterized in that, When performing Step 7, each group of limit steel plates consists of three steel plates arranged in a horizontal character shape, that is, two steel plates are welded on the top surface of one main girder segment, and the other steel plate is welded on the top surface of the other main girder segment and clamped between the two opposite steel plates.

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