CN114718097B - Quick positioning method for deepwater steel cofferdam or open caisson - Google Patents
Quick positioning method for deepwater steel cofferdam or open caisson Download PDFInfo
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- CN114718097B CN114718097B CN202210439283.4A CN202210439283A CN114718097B CN 114718097 B CN114718097 B CN 114718097B CN 202210439283 A CN202210439283 A CN 202210439283A CN 114718097 B CN114718097 B CN 114718097B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
Abstract
The utility model 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 pull cable positioning system devices which are provided with traction equipment are arranged on a trestle or a ship construction platform for water operation; floating the whole cofferdam to a proper position at the downstream of the main pier platform, connecting a pull lug at the front end of the cofferdam with a platform cable positioning system, and winding and unwinding the cable to adjust the posture of the steel cofferdam under the assistance of a ship machine; the tail end of the cofferdam is thrown and provided with crossed splayed anchors for positioning through a winch tail cable system; the front end and the tail end of the cofferdam are gradually retracted and released, and the accurate positioning of the steel cofferdam is finally realized, so that the problem of rapidly realizing the accurate installation and positioning of the steel cofferdam under the condition of limited construction period is solved.
Description
Technical Field
The utility model relates to the field of bridge engineering deepwater foundation construction, in particular to a deepwater steel cofferdam or open caisson rapid positioning method.
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 include the following steps: 1. positioning by a positioning ship: the positioning ship positioning scheme has the advantages of mature construction experience, low construction difficulty and high construction speed; the positioning system has the defects that the number of the ships and the anchor cables is large, the influence on the navigation channel is large, the positioning system is a flexible system, the ships are disturbed by water level fluctuation, and the positioning precision is low. The method is suitable for double-wall steel cofferdam positioning construction with smaller channel passing requirements and lower positioning precision. 2. Anchor pier positioning: the anchor pier positioning scheme has the advantages that construction stress is definite, the number of anchor cables is small, and the construction process is not influenced by the water level; the anchor pier construction method has the advantages that the construction cost of the anchor pier is increased, meanwhile, the river is occupied, and the construction speed is low. The method is suitable for positioning construction of the double-wall steel cofferdam with the advantages of not tight construction period and high positioning precision requirement. The Chinese patent publication No. CN 101666097A discloses a positioning sinking method of a large-scale steel hanging box or a sunk well, namely an anchor pier positioning method, which requires construction of an upstream anchor pier and a downstream anchor pier, and has the advantages of high cost and long time. 3. Auxiliary positioning of the U-shaped platform: the U-shaped platform positioning method has the advantages that large equipment and temporary structural engineering are not needed, the cofferdam positioning precision is high, and the influence on a channel is small; the defect is that a U-shaped platform needs to be formed by construction in advance, and the time period is long. The method is suitable for positioning construction of the double-wall steel cofferdam with the advantages of not tight construction period and high positioning precision requirement. The Chinese patent publication No. CN105970820A discloses an auxiliary positioning method for a U-shaped platform of a large cofferdam.
Under the high-efficiency and intensive social background of the construction industry, the total surplus of the bridge construction period is insufficient, and the method is particularly obvious for the deepwater foundation steel cofferdam on a key line.
Disclosure of Invention
The utility model provides a quick positioning method for a deepwater steel cofferdam or an open caisson, which solves the problem of quick realization of accurate installation and positioning of the steel cofferdam under the condition of limited construction period.
In order to solve the technical problems, the utility model adopts the following technical scheme: a method for quickly positioning a deepwater steel cofferdam or an open caisson is characterized by comprising the following steps: a plurality of pull cable positioning system devices which are provided with traction equipment are arranged on a trestle or a ship construction platform for water operation; floating the whole cofferdam to a proper position at the downstream of the main pier platform, connecting a pull lug at the front end of the cofferdam with a platform cable positioning system, and winding and unwinding the cable to adjust the posture of the steel cofferdam under the assistance of a ship machine; the tail end of the cofferdam is thrown and provided with crossed splayed anchors for positioning through a winch tail cable system; and gradually winding and unwinding the front end and the tail end of the cofferdam, and finally realizing the accurate positioning of the steel cofferdam.
The preferred steps are:
a. and constructing a main pier platform, wherein the main pier platform is constructed by a trestle or a construction ship through vertical steel pipe piles, parallel joints formed by connecting the vertical distribution beams and the transverse distribution beams among the steel pipe piles, a bailey beam above the steel pipe piles 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. The platform cable pulling positioning system is arranged, a plurality of sets of winch-pulley block equipment are arranged on the main pier platform, and a cofferdam positioning power device is formed by winding ropes and reeving the winches and the pulley blocks; the traction means is formed by connecting the steel cofferdam by means of a main cable passing through a guiding trolley.
c. And (3) floating the cofferdam, namely floating the whole cofferdam to a proper position at the downstream of the main pier platform by adopting a power barge, and adjusting the posture of the steel cofferdam under the assistance of the power barge, so that the front surface of the front end of the steel cofferdam is basically parallel to the main pier platform, and sequentially connecting a platform cable and a cofferdam front end lug.
d. The cofferdam is initially positioned, a winch is slowly started to retract and release a platform cable, and the front end of the cofferdam is continuously adjusted to an expected position under the action of pulling force; the tail part of the cofferdam is provided with a cross splayed anchor by throwing an anchor throwing boat, a winch is started to retract and position, and the direction control is carried out by matching with the front end of the cofferdam.
e. And finally positioning the cofferdam, wherein after the front end and the tail end of the cofferdam are adjusted to the expected positions for a plurality of times, all the pull cables are pre-fastened and anchored, so that the final positioning of the cofferdam is realized.
f. The cofferdam is lowered, 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, connecting sleeves are installed on the cofferdam, the guide posts are connected, water is injected into a double-wall interlayer of the cofferdam, meanwhile, the length of each winch for controlling each cable is adjusted, and the cofferdam reaches the water bottom along the lower part of the guide posts.
The method for installing the guide post is also included:
installing a plurality of punching platforms on the cofferdam, and inserting and punching the positioning surrounding cylinder into the underwater foundation by utilizing the punching platforms;
the centering device is arranged on the positioning enclosing cylinder and 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 enclosing cylinder and is fixed;
inserting and punching a guide column by using a punching platform, and supporting the outer wall of the guide column by using a sleeving frame device and adjusting the verticality of the guide column at the same time;
and the verticality of the guide post is monitored while the punching platform inserts and punches the guide post until the guide post is installed.
The lower sleeve frame device and the upper sleeve frame device have the same structure and comprise an annular supporting sleeve frame, a plurality of holding pieces are arranged on the inner side of the supporting sleeve frame along the circumferential direction, a guide rod and an adjusting are arranged on one side of each holding piece, the guide rod is in sliding connection with the side wall of the supporting sleeve frame, and the adjusting rod is in threaded connection with the side wall of the supporting sleeve frame.
Furthermore, in the step a, the working platform can be formed by rapid construction through trestle or water working ship.
Further, in the step b, a cofferdam positioning device is installed on the working platform.
In the step c, a floating lifting lug is arranged on the cofferdam, and the cofferdam is floated to the position close to a cofferdam positioning device of a main pier working platform through tug formation.
In 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 position are arranged on the working platform.
In step d, the third cable (3) and the fourth cable (4) above the cofferdam and the first cable (1) and the second cable (2) below the cofferdam are horizontally connected to the positioning devices on the working platform respectively, and the cofferdam pulls the cofferdam to the vicinity of the working platform through the third cable (3) and the fourth cable (4) above and the first cable (1) and the second cable (2) below the cofferdam.
In the step d, the cofferdam is connected to the positioning device on the working platform in an inclined manner through the sixth cable (6) above and the fifth cable (5) below, and the upper and lower plane positions of the cofferdam are adjusted to be basically parallel to the working platform through the sixth cable (6) above and the fifth cable (5) below.
In the step e, the position of the front end of the cofferdam is adjusted through a seventh pull cable (7) and an eighth pull cable (8) 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 guide pulleys to be connected with traction equipment, and finally the pull cables are pre-tightened and positioned.
The beneficial effects of the utility model are as follows:
1. the ship and anchor pier are not required to be positioned, the influence on the channel is small, and the whole positioning process is economical and efficient by utilizing the operation platform without large-scale equipment and temporary structural engineering.
2. In the positioning process of the platform, the operation platform belongs to a fixed structure, is extremely influenced by water level fluctuation, increases positioning rigidity and stability, and ensures positioning accuracy of the cofferdam.
3. The steel cofferdam is positioned, so that the process is simple, economical and safe, investment and preparation time can be saved when the positioning system is constructed, and precious time is won for the construction of the underwater part structure of the bridge.
4. Compared with an upstream and downstream double-pier type positioning method, the method has the advantages of saving construction cost, reducing the number of winches, along with lower cost and shorter construction period.
5. Through the pre-inserted location enclose section of thick bamboo, improve submarine foundation intensity, improve steering column straightness through righting device, the straightness that hangs down when effectively improving the cofferdam and lowering in place.
Drawings
The utility model is further described below with reference to the drawings and examples.
FIG. 1 is a schematic plan view of a cofferdam positioning apparatus of the present utility model.
FIG. 2 is a schematic elevation view of a cofferdam positioning device of the present utility model.
FIG. 3 is a schematic plan view of a cofferdam floating to a platform.
Fig. 4 is a schematic plan view of a cofferdam initial positioning process.
Fig. 5 is a plan view schematic diagram II of the cofferdam initial positioning process.
Fig. 6 is a schematic plan view of the final positioning process of the cofferdam.
Fig. 7 is a plan view schematic diagram II of the cofferdam final positioning process.
Fig. 8 is a schematic plan view of a cofferdam lowering process.
FIG. 9 is a schematic plan view of a cofferdam lowering process.
Fig. 10 is a schematic diagram of a cofferdam centralizing lowering construction.
Fig. 11 is a second schematic diagram of cofferdam righting lowering construction.
Fig. 12 is a schematic view of a centralizer.
Fig. 13 is a schematic view of cofferdam righting lowering construction.
Wherein: a cofferdam 1; a work platform 2; 2.1 of steel pipe piles; parallel connection and diagonal bracing 2.2; a lower cross beam 2.3; beret 2.4; a distribution beam 2.5; 2.6 parts of steel panel; a cofferdam positioning device 3; an anchor beam 3.1; a main girder 3.2; 3.3 of a winch set; 3.4 of a pulley block; 3.5, a guide wheel; a punching platform 4; positioning the surrounding cylinder 5; a guide post 6; a righting device 7; a support sleeve 7.1; 7.2, tightly holding the sheet; a guide rod 7.3; an adjusting lever 7.4; and 7.5, a guide post.
Detailed Description
The utility model will now be described in further detail with reference to the drawings and to specific examples.
The utility model relates to a positioning device for quickly positioning a large-sized steel cofferdam, which comprises the following steps:
a. as shown in fig. 2, the construction main pier platform is constructed by a vertical steel pipe pile 2.1, a parallel connection and diagonal bracing 2.2 formed by connecting a longitudinal distribution beam and a transverse distribution beam between the steel pipe piles 2.1, a transverse distribution beam 2.3 above the steel pipe pile 2.1, a bailey beam 2.4 above the transverse distribution beam, a transverse distribution beam 2.5 above the bailey beam and a steel panel 2.6 above the transverse distribution beam 2.5; the cofferdam positioning device 3 is formed by installing an anchor 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 unit 3.3 above the main longitudinal beam 3.2, installing a pulley block 3.4 above the main longitudinal beam 3.2 and installing a guide wheel 3.5 above the main longitudinal beam 3.2.
b. The platform cable pulling positioning system is arranged, a plurality of sets of winch-pulley block equipment are arranged on the main pier platform, and a cofferdam positioning power device is formed by winding ropes and reeving the winches and the pulley blocks; the traction means is formed by connecting the steel cofferdam by means of a main cable passing through a guiding trolley.
c. The cofferdam is floated, the cofferdam 1 is floated near the working platform 2, and at this time, the cofferdam 1 is floated near the working platform 2 by a tug to perform the cofferdam preliminary positioning, as shown in fig. 3.
d. The cofferdam is initially positioned, a cable 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 cable (3), a fourth cable (4) and a first cable (1) and a second cable (2) below the cofferdam 1 are respectively connected to the positioning device 3 on the operation platform in a horizontal mode, the cofferdam 1 is pulled to the vicinity of the operation platform 2 through the third cable (3), the fourth cable (4) and the first cable (1) and the second cable (2) below the cofferdam 1, the cofferdam 1 is respectively connected to the positioning device 3 on the operation platform 2 in an inclined mode through a sixth cable (6) above and a fifth cable (5) below the cofferdam 1, and the upper plane and the lower plane positions of the cofferdam are adjusted to be kept basically parallel to the operation platform as shown in fig. 5.
e. As shown in fig. 6 and 7, the cofferdam final positioning is respectively connected to a positioning device on the working platform in an inclined manner through a sixth cable (6) above the cofferdam 1 and a fifth cable (5) below the cofferdam 1, and the upper and lower plane positions of the cofferdam are adjusted to be basically parallel to the working platform 2 through the sixth cable (6) above the cofferdam 1 and the fifth cable (5) below the cofferdam 1; the position of the front end of the cofferdam is adjusted through a seventh pull cable (7) and an eighth pull cable (8) at the rear end of the cofferdam 1;
each cable is connected with the operation platform 2 through the positioning device 3: the fifth pull cable (5) and the sixth pull cable (6) at the front end of the cofferdam 1 are connected to the winch set 3.3 (5 t) through the anchor beam 3.1 near the front end of the cofferdam, the first pull cable (1), the second pull cable (2), the third pull cable (3) and the fourth pull cable (4) at the front end of the cofferdam 1 are connected to the guide wheel 3.5 at the left side on the positioning device 3 through the anchor beam 3.1 at the left side of the working platform 2, and are connected to the winch set 3.3 (5 t); as shown in fig. 7, a seventh pull cable (7) and an eighth pull cable (8) 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 (7) adopts a naval anchor (8 t), and the eighth pull cable (8) is fixed on the shore in a ground anchor mode; all the pull cables connected with the positioning device are guided to the top surface of the working platform through the guide pulleys to be 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 (1) to the eighth pull cable (8).
All the pull cables connected with the front end and the rear end of the cofferdam 1 are adjusted to adjust the positions, 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 pouring of the blade angle concrete is finished.
f. 8-13, a plurality of guide posts 6 are inserted and beaten on the inner side or the outer side of the cofferdam 1, after the guide posts 6 are installed, connecting sleeves 8 are installed on the cofferdam 1 and connected with the guide posts 3.5, water is injected into a double-wall interlayer of the cofferdam 1, and meanwhile, the length of each cable is controlled by adjusting each winch, and the cofferdam 1 reaches the water bottom along the lower part of the guide posts 6.
Because guide post 6 length is longer, directly inserts and beats into in the ground, is difficult to guarantee the straightness that hangs down, can lead to the cofferdam to descend to block or crooked when leading as the cofferdam, consequently when guide post 6 installs, need control guide post 6's straightness that hangs down, guide post 6 installation method is as follows:
a plurality of punching platforms 4 are arranged on the cofferdam 1, the punching platforms 4 are utilized to insert and punch the positioning surrounding cylinder 5 into the underwater foundation, the diameter of the positioning surrounding cylinder 5 is larger than that of the guide column 6, the foundation can be enclosed, the compactness of the foundation can be improved, the sliding of the lower end position of the guide column 6 can be prevented, and the positioning surrounding cylinder is particularly suitable for improving the insertion and punching success rate of the guide column 6 of a soft river bed;
the centering device 7 is arranged on the positioning enclosing 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 enclosing cylinder 5 and fixed, and the positioning enclosing cylinder 5 is relatively short in length and relatively good in verticality control, so that the positioning enclosing cylinder 5 can be used as a verticality reference for arranging the lower sleeve frame device;
the guide column 6 is inserted and beaten by the punching platform 4, the outer wall of the guide column 6 is supported by the upper sleeving frame device, the verticality of the guide column 6 is adjusted during insertion and beaten, the upper sleeving frame device is positioned close to the lower sleeving frame device in the initial stage, so that the accurate positioning of the falling point at the lower end of the guide column 6 is facilitated, the height of the upper sleeving frame device is increased, the distance between the upper sleeving frame device and the lower sleeving frame device is increased, and the control verticality of a span is increased when the lower end of the guide column 6 is inserted into a foundation;
the perpendicularity of the guide post 6 is monitored while the guide post 6 is inserted and beaten by the punching platform 4 until the guide post 6 is installed.
The lower sleeve frame device and the upper sleeve frame device have the same structure and comprise annular supporting sleeve frames 7.1, a plurality of holding pieces 7.2 are arranged on the inner sides of the supporting sleeve frames 7.1 along the circumferential direction, guide rods 7.3 and adjusting rods 7.4 are arranged on one sides of the holding pieces 7.2, the guide rods 7.3 are preferably a plurality of, the guide rods 7.3 are in sliding connection with the side walls of the supporting sleeve frames 7.1, and the adjusting rods 7.4 are in threaded connection with the side walls of the supporting sleeve frames 7.1.
The adjusting rod 7.4 is a screw rod with a handle or an installation motor, the holding piece 7.2 is an arc piece, the holding piece 7.2 can be retracted by rotating the adjusting rod 7.4, the inner cambered surface clamps the outer wall of the guide post 6 or the positioning surrounding cylinder 5, and when the guide post is inserted, the perpendicularity of the guide post 6 can be monitored by a total station, laser measurement or a plumb method.
A plurality of guide posts 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 supporting sleeve frame 7.1 is provided with an ear seat, and the supporting sleeve frame is widened and connected with the ear seat, and can be used as a mounting base of another centering device 7, so that a plurality of centering devices 7 can be stacked, a plurality of points in the vertical direction of the guide column 6 can be centered, and the supporting sleeve frame is particularly suitable for the guide column 6 which is formed by multiple sections of spliced.
In the description of the present utility model, 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, and are merely for convenience in description of the present utility model and simplification of the description.
The above embodiments are only preferred embodiments of the present utility model, and should not be construed as limiting the present utility model, and the scope of the present utility model should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this utility model are also within the scope of the utility model.
Claims (3)
1. A quick positioning method for a deepwater steel cofferdam or an open caisson is characterized by comprising the following steps: building an operation platform at the main pier and installing a cofferdam positioning device; the cofferdam is integrally conveyed to a position close to the downstream of the operation platform for positioning through floating; the front end of the cofferdam is pulled to the positioning device through a plurality of pull cables which are connected to the positioning system and provided with traction equipment; the rear end of the cofferdam is fixed through a plurality of pull cables which are connected to the cofferdam and provided with traction equipment, and finally the pull cables are pre-tightened and positioned;
the construction method comprises the following specific construction steps:
a. constructing a main pier platform, namely constructing vertical steel pipe piles, parallel diagonal bracing, pile caps, main beams, distribution beams, panels and railing auxiliary facilities from a trestle or a construction ship;
b. the platform cable pulling positioning system is arranged, a plurality of sets of winch-pulley block equipment are arranged on the main pier platform, a cofferdam positioning power system is formed by winding ropes of a winch and a pulley block, and a main cable is arranged on the guide pulley to form a positioning traction system;
c. the cofferdam is floated, the whole cofferdam is floated to a proper position at the downstream of the main pier platform by adopting a power barge, the posture of the steel cofferdam is regulated under the assistance of the power barge, the front surface of the front end of the steel cofferdam is kept parallel to the main pier platform, and a platform cable and a cofferdam front end lug are connected in sequence;
d. the cofferdam is initially positioned, a winch is slowly started to retract and release a platform cable, and the front end of the cofferdam is continuously adjusted to an expected position under the action of pulling force; the tail part of the cofferdam is cast with a cross splayed anchor by adopting an anchor casting boat, a winch is started to retract and position, and the direction control is carried out by matching with the front end of the cofferdam; the third cable and the fourth cable above the cofferdam and the first cable and the second cable below the cofferdam are respectively connected to a positioning device on the operation platform in a horizontal mode, and the cofferdam pulls the cofferdam to an accessory of the operation platform through the third cable and the fourth cable above and the first cable and the second cable below the cofferdam; the cofferdam is connected to a positioning device on the operation platform in an inclined mode through a sixth cable above and a fifth cable below the cofferdam, and the upper and lower plane positions of the cofferdam are adjusted to be parallel to the operation platform through the sixth cable above the cofferdam and the fifth cable below the cofferdam;
e. the cofferdam is finally positioned, and after the front end and the tail end of the cofferdam are adjusted to the expected positions for many times, all the cables are pre-fastened and anchored to realize the cofferdam final positioning; adjusting the position of the front end of the cofferdam through a seventh cable and an eighth cable at the rear end of the cofferdam;
after step e, further comprising step f:
the cofferdam is lowered, 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, connecting sleeves are installed on the cofferdam, the guide posts are connected, water is injected into a double-wall interlayer of the cofferdam, and meanwhile, each winch is adjusted to control the length of each cable, and the cofferdam reaches the water bottom along the lower part of the guide posts;
the method for installing the guide post is also included:
installing a plurality of punching platforms on the cofferdam, and inserting and punching the positioning surrounding cylinder into the underwater foundation by utilizing the punching platforms;
the centering device is arranged on the positioning enclosing cylinder and 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 enclosing cylinder and is fixed;
inserting and punching a guide column by using a punching platform, and supporting the outer wall of the guide column by using a sleeving frame device and adjusting the verticality of the guide column at the same time;
the verticality of the guide column is monitored while the guide column is inserted and punched at the side of the punching platform until the guide column is installed;
the lower sleeve frame device and the upper sleeve frame device have the same structure and comprise an annular supporting sleeve frame, a plurality of holding pieces are arranged on the inner side of the supporting sleeve frame along the circumferential direction, a guide rod and an adjusting rod are arranged on one side of each holding piece, the guide rod is in sliding connection with the side wall of the supporting sleeve frame, and the adjusting rod is in threaded connection with the side wall of the supporting sleeve frame;
the method comprises the steps that in the initial stage, an upper sleeve frame device is positioned close to a lower sleeve frame device and used for accurately positioning a falling point at the lower end of a guide column, when the lower end of the guide column is inserted into a foundation, the height of the upper sleeve frame device is increased, the distance between the upper sleeve frame device and the lower sleeve frame device is increased, and the span is increased to control verticality;
the diameter of the positioning surrounding cylinder 5 is larger than that of the guide post 6.
2. The method for quickly positioning the deepwater steel cofferdam or open caisson according to claim 1, wherein the method comprises the following steps: in the step d, a plurality of positioning marks are arranged on the cofferdams before traction, and reference marks corresponding to the positioning marks when the plurality of cofferdams reach the design position are arranged on the working platform.
3. The method for quickly positioning the deepwater steel cofferdam or open caisson according to claim 1, wherein the method comprises the following steps: all the pull cables connected with the operation platform and arranged on the cofferdam are guided to the top surface of the platform through guide pulleys to be connected with traction equipment, and finally the pull cables are pre-tightened and positioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN114718097A CN114718097A (en) | 2022-07-08 |
| CN114718097B true CN114718097B (en) | 2023-09-22 |
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