CN114718097A - Quick positioning method for deep water steel cofferdam or open caisson - Google Patents
Quick positioning method for deep water steel cofferdam or open caisson Download PDFInfo
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- CN114718097A CN114718097A CN202210439283.4A CN202210439283A CN114718097A CN 114718097 A CN114718097 A CN 114718097A CN 202210439283 A CN202210439283 A CN 202210439283A CN 114718097 A CN114718097 A CN 114718097A
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- E02D19/00—Keeping dry foundation sites or other areas in the ground
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Abstract
The application provides a method for quickly positioning a deepwater steel cofferdam or an open caisson, which is characterized by comprising the following steps: a plurality of stay cable positioning system devices which are provided with traction equipment are arranged on a trestle or a water operation ship construction platform; floating and transporting the whole cofferdam to a proper position at the downstream of a main pier platform, connecting a pull lug at the front end of the cofferdam with a platform pull cable positioning system, and retracting a pull cable to adjust the posture of the steel cofferdam under the assistance of a ship machine; the tail end of the cofferdam is provided with crossed splayed anchor positions through a winch tail cable system; and the cable pulling systems at the front end and the tail part of the cofferdam are gradually retracted, so that the accurate positioning of the steel cofferdam is finally realized, and the problem of quickly realizing the accurate installation and positioning of the steel cofferdam under the condition of limited construction period is solved.
Description
Technical Field
The invention relates to the field of construction of deep water foundations of bridge engineering, in particular to a method for quickly positioning a deep water steel cofferdam or an open caisson.
Background
The double-wall steel cofferdam is a bearing platform construction water stop structure and a drilling platform supporting structure, and the common positioning methods comprise the following steps: 1. positioning by a positioning ship: the positioning scheme of the positioning ship has the advantages of mature construction experience, smaller construction difficulty and high construction speed; the positioning system is a flexible system, the ship is disturbed by water level fluctuation, and the positioning precision is low. The method is suitable for the positioning construction of the double-wall steel cofferdam with smaller requirement on the passage of the navigation channel and lower positioning precision. 2. Anchor pier positioning: the anchor pier positioning scheme has the advantages that the construction stress is clear, the number of anchor cables is small, and the construction process is not influenced by the water level; the disadvantages are that the cost of anchor pier construction is increased, and the river channel is occupied, and the construction speed is slow. The method is suitable for the positioning construction of the double-wall steel cofferdam with the short construction period and high positioning precision requirement. The chinese patent publication No. CN 101666097a discloses a positioning and sinking method for large steel suspension boxes or open caissons, i.e. an anchor pier positioning method, which requires construction of an upstream anchor pier and a downstream anchor pier, and has high cost and long time. 3. U-shaped platform assistance-style location: the U-shaped platform positioning method has the advantages that large-scale equipment and temporary structural engineering are not needed, the cofferdam positioning precision is high, and the influence on a navigation channel is small; the defect is that the U-shaped platform needs to be constructed in advance, and the time period is long. The method is suitable for the positioning construction of the double-wall steel cofferdam with the short construction period and high positioning precision requirement. Chinese patent publication No. CN105970820A discloses an auxiliary positioning method for U-shaped platform of large cofferdam.
Under the social background of high efficiency and integration in the capital construction industry, the total surplus of the construction period of the bridge is insufficient, and the method is particularly obvious for the deep water foundation steel cofferdam on the key line.
Disclosure of Invention
The invention provides a quick positioning method for a deepwater steel cofferdam or an open caisson, which solves the problem of quickly realizing the accurate installation and positioning of the steel cofferdam under the condition of limited construction period.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for quickly positioning a deepwater steel cofferdam or open caisson is characterized by comprising the following steps: a plurality of cable pulling positioning system devices which are provided with traction equipment are arranged on a trestle or a water working ship construction platform; floating and transporting the whole cofferdam to a proper position at the downstream of a main pier platform, connecting a pull lug at the front end of the cofferdam with a platform pull cable positioning system, and retracting a pull cable to adjust the posture of the steel cofferdam with the aid of a ship machine; the tail end of the cofferdam is provided with crossed splayed anchor positions through a winch tail cable system in a throwing way; and gradually winding and unwinding the cable pulling system at the front end and the tail part of the cofferdam, and finally realizing the accurate positioning of the steel cofferdam.
The preferred steps are:
a. a main pier platform is constructed, a main pier is built on a trestle or a construction ship through a vertical steel pipe pile and a parallel connection formed by connecting a longitudinal distribution beam and a transverse distribution beam between the steel pipe piles, a Bailey beam above the steel pipe pile and a steel panel above the Bailey beam, and the main trestle extends to the main pier and then continues to expand to form the main pier platform.
b. Arranging a platform pull cable positioning system, mounting a plurality of sets of winch-pulley block equipment on a main pier platform, and performing rope winding and rope reeving on a winch and a pulley block to form a cofferdam positioning power device; the traction device is formed by connecting a steel cofferdam through a main cable penetrating through the guide pulley.
c. Floating and transporting the cofferdam, namely floating and transporting the whole cofferdam to a proper position at the downstream of a main pier platform by adopting a power barge, adjusting the posture of the steel cofferdam under the assistance of the power barge to ensure that the front side of the front end of the steel cofferdam is basically parallel to the main pier platform, and sequentially connecting a platform pull cable and a front end pull lug of the cofferdam.
d. The cofferdam is initially positioned, a winch retracting platform is slowly started to pull a cable, and the front end of the cofferdam continues to adjust the posture to an expected position under the action of tension; the tail part system of the cofferdam adopts an anchor throwing boat to throw crossed splayed anchors, starts a winch to retract, position and is matched with the front end of the cofferdam to carry out direction control.
e. And finally positioning the cofferdam, and pre-tightening and anchoring all the pull cables after the pull cables at the front end and the tail end of the cofferdam are adjusted to expected positions for multiple times to realize the final positioning of the cofferdam.
f. The cofferdam is transferred, a plurality of guide posts are inserted and beaten on the inner side or the outer side of the cofferdam, after the guide posts are installed, a connecting sleeve is installed on the cofferdam, the guide posts are connected, water is injected into a double-wall interlayer of the cofferdam, the length of each pull cable is controlled by each winch through adjustment, and the cofferdam is arranged at the bottom of the water along the lower part of the guide posts.
The method also comprises the following steps:
installing a plurality of punching platforms on the cofferdam, and inserting and punching the positioning enclosing cylinder into the underwater foundation by using the punching platforms;
a centering device is arranged on the positioning surrounding cylinder, the centering device comprises a lower sleeve frame device and an upper sleeve frame device, and the lower sleeve frame device is arranged on the outer side of the positioning surrounding cylinder and is fixed;
inserting and punching the guide post by using the punching platform, supporting the outer wall of the guide post by using the upper sleeve frame device, and adjusting the verticality of the guide post;
and monitoring the verticality of the guide column while inserting and punching the guide column by the punching platform until the guide column is installed.
The lower sleeve frame device and the upper sleeve frame device are identical in structure and comprise annular supporting sleeve frames, a plurality of tightly-holding pieces are arranged on the inner sides of the supporting sleeve frames along the circumferential direction, guide rods and adjustment rods are arranged on one sides of the tightly-holding pieces, the guide rods are connected with the side walls of the supporting sleeve frames in a sliding mode, and the adjustment rods are connected with the side walls of the supporting sleeve frames in a threaded mode.
Furthermore, in the step a, a working platform can be quickly constructed and formed through a trestle or a water-borne working ship.
Further, in the step b, a cofferdam positioning device is installed on the working platform.
And furthermore, in the step c, mounting floating lifting lugs on the cofferdam, and floating the cofferdam to the vicinity of the cofferdam positioning device of the main pier operation platform through tug formation.
Furthermore, in the step d, a plurality of positioning marks are arranged on the cofferdam before traction, and a plurality of reference marks corresponding to the positioning marks when the cofferdam reaches the design place are arranged on the operation platform.
Furthermore, in the step d, a third stay cable (c) and a fourth stay cable (c) above the cofferdam and a first stay cable (c) and a second stay cable (c) below the cofferdam are horizontally connected to the positioning device on the operation platform respectively, and the cofferdam is drawn to the vicinity of the operation platform through the third stay cable (c) and the fourth stay cable (c) above and the first stay cable (c) and the second stay cable (c) below the cofferdam.
In step d, the cofferdam is obliquely connected to the positioning devices on the operation platform through the sixth stay cable (C) above and the fifth stay cable (C) below the cofferdam, and the upper and lower plane positions of the cofferdam are adjusted to be basically parallel to the operation platform through the sixth stay cable (C) above and the fifth stay cable (C) below the cofferdam.
Furthermore, in the step e, the position of the front end of the cofferdam is adjusted through a seventh stay cord (c) and an eighth stay cord (b) at the rear end of the cofferdam;
furthermore, all the pull cables connected with the operation platform and arranged on the cofferdam are guided to the top surface of the platform through the guide pulleys to be connected with the traction equipment, and finally the pull cables are pre-tightened and positioned.
The invention has the beneficial effects that:
1. the positioning ship and the anchor pier are not needed, the influence on the channel is small, the operation platform is utilized, large-scale equipment and temporary structural engineering are not needed, and the whole positioning process is economical and efficient.
2. In the process of positioning by utilizing the platform, the operation platform belongs to a fixed structure, is little influenced by water level fluctuation, increases the positioning rigidity and stability, and ensures the positioning precision of the cofferdam.
3. The steel cofferdam is positioned, the process is simple, economy and safety are realized, the investment and the preparation time can be saved when the positioning system is constructed, and the precious time is won for the construction of the underwater part structure of the bridge.
4. The method has the advantages of saving construction cost compared with an upstream and downstream double-pier type positioning method, reducing the number of winches, lowering cost and shortening construction period.
5. Through inserting the location surrounding cylinder in advance, improve submarine foundation intensity, improve the guide post through righting the device and hang down straightness, effectively improved the straightness that hangs down when the cofferdam is transferred to target in place.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic plan view of the cofferdam positioning device of the present invention.
Fig. 2 is a schematic elevation view of a cofferdam positioning device of the present invention.
Fig. 3 is a schematic plan view of the cofferdam floating-to-platform process.
Fig. 4 is a first schematic plan view of a cofferdam initial positioning process.
Fig. 5 is a schematic plan view of a cofferdam initial positioning process.
Fig. 6 is a plan view illustrating a final cofferdam positioning process.
Fig. 7 is a plan view schematically illustrating a final cofferdam positioning process.
Fig. 8 is a plan view of the first cofferdam lowering process.
Fig. 9 is a plan view schematically illustrating a cofferdam lowering process.
Fig. 10 is a first cofferdam erection and lowering construction diagram.
Fig. 11 is a schematic diagram of cofferdam righting and lowering construction.
Fig. 12 is a schematic view of a centralizer.
Fig. 13 is a third schematic view of cofferdam erection and lowering construction.
Wherein: cofferdam 1; a work platform 2; 2.1 of the steel pipe pile; parallel connection and an inclined strut 2.2; a lower beam 2.3; 2.4 of Bailey tablets; a distribution beam 2.5; 2.6 parts of steel panels; a cofferdam positioning device 3; an anchoring beam 3.1; a main longitudinal beam 3.2; 3.3 of a winch set; 3.4 of a pulley block; 3.5 of a guide wheel; a punching platform 4; a positioning surrounding cylinder 5; a guide post 6; a righting device 7; a support jacket frame 7.1; a holding sheet 7.2; a guide rod 7.3; an adjusting lever 7.4; and 7.5, a guide post.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
The invention relates to a positioning device and a method for quickly positioning a large steel cofferdam, which comprises the following steps:
a. constructing a main pier platform, and building an operation platform 2 through a horizontal connection and an inclined strut 2.2 formed by connecting a longitudinal distribution beam and a transverse distribution beam between a vertical steel pipe pile 2.1 and the steel pipe pile 2.1, the transverse distribution beam 2.3 above the steel pipe pile 2.1, a Bailey beam 2.4 above the transverse distribution beam, the transverse distribution beam 2.5 above the Bailey beam and a steel panel 2.6 above the transverse distribution beam 2.5 as shown in figure 2; the cofferdam positioning device 3 is formed by installing an anchoring beam 3.1 on a vertical steel pipe pile 2.1 of an operation platform, installing a main longitudinal beam 3.2 above a lower cross beam 2.3 of the operation platform, installing a winch set 3.3 above the main longitudinal beam 3.2, installing a tackle pulley 3.4 above the main longitudinal beam 3.2 and installing a guide wheel 3.5 above the main longitudinal beam 3.2.
b. Arranging a platform pull cable positioning system, mounting a plurality of sets of winch-pulley block equipment on a main pier platform, and performing rope winding and reeving on the winches and the pulley blocks to form a cofferdam positioning power device; the traction device is formed by connecting a steel cofferdam through a main cable penetrating through the guide pulley.
c. And (3) carrying out cofferdam floating transportation, namely carrying out floating transportation on the cofferdam 1 to the position close to the operation platform 2, and carrying out primary cofferdam positioning on the cofferdam 1 to the position close to the operation platform 2 through tugboat floating transportation at the moment, as shown in figure 3.
d. The cofferdam is initially positioned, pull cables at the front end of the cofferdam 1 and a cofferdam positioning device 3 on an operation platform are installed in advance, as shown in fig. 4, a third pull cable and a fourth pull cable above the cofferdam 1, a first pull cable and a second pull cable below the cofferdam 1 are horizontally connected to the positioning device 3 on the operation platform respectively, the cofferdam 1 is pulled to the position near the operation platform 2 through the third pull cable and the fourth pull cable above the cofferdam 1 and the first pull cable and the second pull cable below the cofferdam 1, the cofferdam 1 is obliquely connected to the positioning device 3 on the operation platform 2 through the sixth pull cable above the cofferdam 1 and the fifth pull cable below the cofferdam 1, and the upper and lower plane positions of the cofferdam are adjusted to be basically parallel to the operation platform as shown in fig. 5.
e. Finally positioning the cofferdam, as shown in fig. 6 and 7, obliquely connecting the sixth stay cable (C) above the cofferdam 1 and the fifth stay cable (C) below the cofferdam 1 to the positioning device on the operation platform respectively, and adjusting the upper and lower plane positions of the cofferdam to be basically parallel to the operation platform 2 by the sixth stay cable (C) above the cofferdam 1 and the fifth stay cable (C) below the cofferdam 1; the direction position of the front end of the cofferdam is adjusted through a seventh pull cable (c) and an eighth pull cable (b) at the rear end of the cofferdam 1;
each cable is connected with the operation platform 2 through the positioning device 3: a fifth stay cable fifth and a sixth stay cable sixth at the front end of the cofferdam 1 are connected to a winch set 3.3 (5 t) through a guide wheel 3.5 on the anchoring beam 3.1 connecting and positioning device 3 close to the front end of the cofferdam, and the first stay cable, the second stay cable, the third stay cable and the fourth stay cable fourth at the front end of the cofferdam 1 are connected to the winch set 3.3 (5 t) through a guide wheel 3.5 on the left side of the anchoring beam 3.1 connecting and positioning device 3 on the left side of the operation platform 2; as shown in fig. 7, a seventh pull cable (c) and an eighth pull cable (b) at the rear end of the cofferdam (1) are connected to the upper part of the cofferdam (1) through a winch (10 t), the seventh pull cable (c) is fixed to the bank in the form of a ground anchor (8 t); and the pull cables on all the connecting and positioning devices are guided to the top surface of the operation platform through the guide pulleys and are connected with the traction equipment.
The winch set 3.3 comprises a 1# -8# winch, and the 1# -8# winch respectively provides power for the first pull cable and the eighth pull cable.
The position of all the pull cables connected with the front end and the rear end of the cofferdam 1 is adjusted, when the cofferdam is pulled to a main pier area, the pull cables are fixed on anchor points corresponding to the cofferdam, all the pull cables are pre-tightened, the final positioning of the cofferdam is realized, and the preparation work before the edge angle concrete pouring is well carried out.
f. And (3) lowering the cofferdam, inserting and striking a plurality of guide posts 6 on the inner side or the outer side of the cofferdam 1 as shown in figures 8-13, after the guide posts 6 are installed, installing connecting sleeves 8 on the cofferdam 1, connecting the guide posts 3.5, injecting water into the double-wall interlayer of the cofferdam 1, simultaneously adjusting the lengths of the pulling cables controlled by the various windlasses, and enabling the cofferdam 1 to reach the water bottom along the lower part of the guide posts 6.
Because 6 length of guide post are longer, directly insert and beat into the ground, are difficult to guarantee the straightness that hangs down, can lead to the cofferdam to transfer when the cofferdam direction and block or skew, therefore when 6 installations of guide post, need control the straightness that hangs down of guide post 6, 6 installation methods of guide post as follows:
the cofferdam 1 is provided with a plurality of punching platforms 4, the positioning surrounding cylinders 5 are inserted into the foundation at the bottom of the water by the punching platforms 4, the diameter of the positioning surrounding cylinders 5 is larger than that of the guide posts 6, the foundation can be enclosed, the tightness of the foundation is improved, the lower end positions of the guide posts 6 can be prevented from sliding, and the cofferdam is particularly suitable for improving the inserting and punching success rate of the guide posts 6 of the soft riverbed;
the centering device 7 is arranged on the positioning surrounding cylinder 5, and overcomes the impact of water flow on the guide post 6, the centering device 7 comprises a lower sleeve frame device and an upper sleeve frame device, the lower sleeve frame device is arranged on the outer side of the positioning surrounding cylinder 5 and is fixed, and the positioning surrounding cylinder 5 is shorter in length and better controls the verticality, so that the lower sleeve frame device can be arranged on the positioning surrounding cylinder 5 as a verticality reference;
the guide post 6 is inserted and punched by the punching platform 4, the outer wall of the guide post 6 is supported by the upper sleeve frame device, the perpendicularity of the guide post 6 is adjusted during inserting and punching, the upper sleeve frame device is positioned close to the lower sleeve frame device at the beginning, so that the accurate positioning of the lower end drop point of the guide post 6 is facilitated, the height of the upper sleeve frame device is improved when the lower end of the guide post 6 is inserted into a foundation, the distance between the upper sleeve frame device and the lower sleeve frame device is increased, and the span is increased to better control the perpendicularity;
the perpendicularity of the guide column 6 is monitored while the guide column 6 is inserted into the punching platform 4 until the guide column 6 is installed.
The lower sleeve frame device and the upper sleeve frame device are identical in structure and comprise an annular supporting sleeve frame 7.1, a plurality of tightly-holding pieces 7.2 are arranged on the inner side of the supporting sleeve frame 7.1 along the circumferential direction, a guide rod 7.3 and an adjusting rod 7.4 are arranged on one side of each tightly-holding piece 7.2, the guide rods 7.3 are preferably multiple, the guide rods 7.3 are connected with the side wall of the supporting sleeve frame 7.1 in a sliding mode, and the adjusting rod 7.4 is connected with the side wall of the supporting sleeve frame 7.1 in a threaded mode.
The adjusting rod 7.4 is a screw rod with a handle or an installation motor, the holding piece 7.2 is an arc-shaped piece, the holding piece 7.2 can be retracted by rotating the adjusting rod 7.4, the inner arc surface clamps the guide post 6 or the outer wall of the positioning surrounding barrel 5, and the perpendicularity of the guide post 6 can be monitored by adopting a total station, laser measurement or a plumb bob method during inserting and beating.
A plurality of guide pillars 7.5 are arranged between the lower sleeve frame device and the upper sleeve frame device, so that the height position of the upper sleeve frame device can be adjusted, hoisting machinery such as a winch is arranged on the punching platform 4, the height of the upper sleeve frame device is controlled, and different construction requirements are met.
One end of the support sleeve frame 7.1 is provided with an ear seat, the widened surface is connected with the ear seat, and the support sleeve frame can be used as an installation base station of another righting device 7, so that a plurality of righting devices 7 can be stacked, a plurality of points in the vertical direction of the guide column 6 can be righted, and the support sleeve frame is particularly suitable for the guide column 6 in a multi-section assembled mode.
In the description of the present invention, the terms "front end", "rear end", "above", "down", "horizontal", "oblique", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for the convenience of description of the present invention and simplification of description.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (10)
1. A quick positioning method for a deepwater steel cofferdam or open caisson is characterized by comprising the following steps: constructing an operation platform at the main pier and installing a cofferdam positioning device; conveying the whole cofferdam to a position close to the downstream of the operation platform by floating; the front end of the cofferdam is dragged to the positioning device through a plurality of pull cables which are connected to the positioning system and provided with dragging equipment; the rear end of the cofferdam is fixed by a plurality of pull cables which are connected to the cofferdam and provided with traction equipment through tail anchor points, and finally the pull cables are pre-tightened and positioned.
2. The rapid positioning method for the deepwater steel cofferdam or open caisson according to the claim 1, wherein: the method comprises the following specific construction steps:
a. constructing a main pier platform, namely constructing auxiliary facilities such as vertical steel pipe piles, parallel-connection inclined struts, pile caps, main beams, distribution beams, panels, railings and the like from a trestle or a construction ship;
b. arranging a platform pull cable positioning system, mounting a plurality of sets of winch-pulley block equipment on a main pier platform, carrying out rope winding and rope threading on a winch and a pulley block to form a cofferdam positioning power system, and mounting a main cable on a guide pulley to form a positioning traction system;
c. floating and transporting the cofferdam, namely floating and transporting the whole cofferdam to a proper position at the downstream of a main pier platform by adopting a power barge, adjusting the posture of the steel cofferdam under the assistance of the power barge to ensure that the front side of the front end of the steel cofferdam is basically parallel to the main pier platform, and sequentially connecting a platform pull cable and a pull lug at the front end of the cofferdam;
d. the cofferdam is initially positioned, a winch retracting platform is slowly started to pull a cable, and the front end of the cofferdam continues to adjust the posture to an expected position under the action of tension; the tail system of the cofferdam adopts an anchor throwing boat to throw crossed splayed anchors, a winch is started to receive, release and position, and the direction control is carried out by matching with the front end of the cofferdam;
e. and finally positioning the cofferdam, and pre-tightening and anchoring all the pull cables after the pull cables at the front end and the tail end of the cofferdam are adjusted to expected positions for multiple times to realize the final positioning of the cofferdam.
3. The rapid positioning method for the deepwater steel cofferdam or open caisson according to claim 2, wherein: step f is also included after step e:
the cofferdam is transferred, a plurality of guide posts are inserted and beaten on the inner side or the outer side of the cofferdam, after the guide posts are installed, a connecting sleeve is installed on the cofferdam, the guide posts are connected, water is injected into a double-wall interlayer of the cofferdam, the length of each pull cable is controlled by each winch through adjustment, and the cofferdam is arranged at the bottom of the water along the lower part of the guide posts.
4. The rapid positioning method for the deepwater steel cofferdam or open caisson according to the claim 3, wherein: the method also comprises the following steps:
installing a plurality of punching platforms on the cofferdam, and inserting and punching the positioning enclosing cylinder into the underwater foundation by using the punching platforms;
a centering device is arranged on the positioning surrounding cylinder, the centering device comprises a lower sleeve frame device and an upper sleeve frame device, and the lower sleeve frame device is arranged on the outer side of the positioning surrounding cylinder and is fixed;
inserting and punching the guide post by using the punching platform, supporting the outer wall of the guide post by using the upper sleeve frame device, and adjusting the verticality of the guide post;
and monitoring the verticality of the guide column while inserting and punching the guide column by the punching platform until the guide column is installed.
5. The rapid positioning method for the deepwater steel cofferdam or open caisson according to claim 4, wherein: the lower sleeve frame device and the upper sleeve frame device are identical in structure and comprise annular supporting sleeve frames, a plurality of tightly-holding pieces are arranged on the inner sides of the supporting sleeve frames along the circumferential direction, guide rods and adjustment rods are arranged on one sides of the tightly-holding pieces, the guide rods are connected with the side walls of the supporting sleeve frames in a sliding mode, and the adjustment rods are connected with the side walls of the supporting sleeve frames in a threaded mode.
6. The rapid positioning method for the deepwater steel cofferdam or open caisson according to claim 2, wherein: and d, arranging a plurality of positioning marks on the cofferdam before traction, and arranging a plurality of reference marks corresponding to the positioning marks when the cofferdam reaches a design position on the operation platform.
7. The rapid positioning method for the deepwater steel cofferdam or open caisson according to claim 2, wherein: in the step d, a third pull cable and a fourth pull cable above the cofferdam and a first pull cable and a second pull cable below the cofferdam are horizontally connected to the positioning devices on the operation platform respectively, and the cofferdam pulls the cofferdam to the accessories of the operation platform through the third pull cable and the fourth pull cable above the cofferdam and the first pull cable and the second pull cable below the cofferdam.
8. The rapid positioning method for the deepwater steel cofferdam or open caisson according to claim 2, wherein: in the step d, the cofferdam is obliquely connected to the positioning device on the operation platform through the sixth stay cable above the cofferdam and the fifth stay cable below the cofferdam, and the upper and lower plane positions of the cofferdam are adjusted to be basically parallel to the operation platform through the sixth stay cable above the cofferdam and the fifth stay cable below the cofferdam.
9. The method for quickly positioning the deepwater steel cofferdam or open caisson according to claim 8, wherein: and e, adjusting the position of the front end of the cofferdam in the direction through a seventh stay cable and an eighth stay cable at the rear end of the cofferdam.
10. The rapid positioning method for the deepwater steel cofferdam or open caisson according to claim 2, characterized in that: all the stay cables connected with the operation platform and arranged on the cofferdam are guided to the top surface of the platform through the guide pulleys to be connected with traction equipment, and finally the stay cables are pre-tightened and positioned.
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| CN202210439283.4A CN114718097B (en) | 2022-04-25 | 2022-04-25 | Quick positioning method for deepwater steel cofferdam or open caisson |
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