CN110939147A - Method for accurately positioning inserting and beating steel casing of double-wall steel suspension box cofferdam - Google Patents
Method for accurately positioning inserting and beating steel casing of double-wall steel suspension box cofferdam Download PDFInfo
- Publication number
- CN110939147A CN110939147A CN201911100718.7A CN201911100718A CN110939147A CN 110939147 A CN110939147 A CN 110939147A CN 201911100718 A CN201911100718 A CN 201911100718A CN 110939147 A CN110939147 A CN 110939147A
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- guide ring
- cofferdam
- steel casing
- steel
- beating
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention provides a method for accurately positioning inserting and beating steel casing of a double-wall steel suspension box cofferdam, which is used for assembling the cofferdam after lofting; installing a keel and arranging a guide ring; then the cofferdam is launched, and the inserting and punching hole position of the cofferdam is adjusted to the designed pile position; lowering the steel casing and inserting and beating the steel casing; after the first positioning pile is inserted and beaten, the plane position of the cofferdam is finely adjusted by adjusting the ejector pin, so that the cofferdam reaches higher precision, and the rest is done in sequence until all the steel pile casings are inserted and beaten. The invention has good flexibility and adaptability, effectively improves the positioning precision, saves a large amount of positioning time, reduces the construction cost investment and can shorten the construction period.
Description
Technical Field
The invention belongs to the technical field of cofferdam construction, and particularly relates to a method for accurately positioning inserting and beating steel casing of a double-wall steel suspension box cofferdam.
Background
The double-wall steel suspension box cofferdam construction technology can be used as a bored pile construction platform and a bearing platform construction water retaining structure, is applied to more and more projects, is particularly suitable for deep water foundation construction, but is difficult to accurately position the plane position of the steel cofferdam due to the fact that the whole size of the cofferdam is too large and the influence of external environment is added. The construction difficulty is big, the efficiency is low, positioning accuracy is poor, simultaneously, also has the defect that construction cost is high, the period of construction is long.
Disclosure of Invention
In view of the above, the invention aims to overcome the defects in the prior art, and provides the method for accurately positioning the inserting and beating of the steel casing of the double-wall steel suspension box cofferdam, which is easy to construct, can safely and reliably meet the requirement of construction precision, is high in inserting and beating precision, and saves the construction period and the cost.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for accurately positioning inserting and beating steel casing of double-wall steel suspension box cofferdam comprises the following steps:
lofting the longitudinal and transverse axes of the cofferdam and the central hole site of each pile position;
assembling cofferdams according to lofting point positions;
installing a cofferdam bottom plate keel, and installing a fixed lower guide ring and a movable lower guide ring on the bottom plate keel;
installing a cofferdam top plate keel, and installing a fixed upper guide ring and a movable upper guide ring on the top plate keel;
adjusting the push rod of each movable upper guide ring to a tightening state, then launching the cofferdam, and adjusting the inserting and punching hole position of the cofferdam to the designed pile position;
under the condition that the cofferdam is horizontal, lowering the steel casing to the bottom of the river bed according to the designated pile position, and fixing the plane position of the steel casing by utilizing a movable lower guide ring;
the length of the movable upper guide ring pushing rod is adjusted to control the hoop to move back and forth so as to adjust the verticality of the steel casing, and the steel casing is inserted and beaten;
after the first positioning pile is inserted and beaten, the plane position of the cofferdam is finely adjusted by adjusting the ejector pin, so that the cofferdam reaches higher precision, and the rest is done in sequence until all the steel pile casings are inserted and beaten.
Further, before launching the cofferdam, the movable lower guide ring and the fixed lower guide ring are positioned by a bolt plane, the tail part of the movable lower guide ring and the fixed lower guide ring are supported by a filling plate, and the movable lower guide ring and the fixed lower guide ring are fixed by bolts.
Furthermore, the movable upper guide ring comprises a push rod arranged on the guide box, the front end of the push rod is provided with a linkage rod, and the linkage rod is connected with the hoop through a pin.
Further, the movable upper guide ring and the movable lower guide ring are concentrically arranged.
Further, the fixed upper guide ring and the fixed lower guide ring are concentrically arranged.
Further, before the steel casing is inserted and beaten, the error between the center of the steel casing and the designed pile position center is measured, if the error meets the requirement, the ejector rod is driven to extend out, and the clamp is abutted against the steel casing; and if the error is unqualified after the measurement, repeatedly lowering and adjusting the steel casing.
Further, the plane error of the upper guide ring and the fixed upper guide ring is controlled within 5 mm.
Further, the plane error of the lower guide ring and the fixed lower guide ring is controlled within 5 mm.
Compared with the prior art, the invention has the following advantages:
the method provided by the invention has good flexibility and adaptability, meets the requirement of pile position positioning allowable deviation of the foundation pile, effectively improves the positioning precision, saves a large amount of positioning time, reduces the construction cost investment and can shorten the construction period.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
FIG. 1 is a cross-sectional view of a steel casing during a plugging construction according to an embodiment of the present invention;
FIG. 2 is a top view of the movable upper guide ring according to the embodiment of the present invention;
FIG. 3 is an elevation view of a movable upper guide ring in an embodiment of the present invention;
FIG. 4 is a schematic plan view of the movable upper guide ring in the embodiment of the present invention;
fig. 5 is a schematic plan view of a movable lower guide ring in the embodiment of the invention.
Description of reference numerals:
1-a floor keel; 2-moving the lower guide ring; 3-roof keel; 4-moving the upper guide ring; 5-pushing the push rod; 6-guiding the box; 7-linkage rod; 8, clamping a hoop; 9-a pin; 10-shovelling and cushioning; 11-a base; 12-steel casing.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
An inserting and beating accurate positioning method for steel casings of a double-wall steel suspension box cofferdam is shown in figures 1 to 5 and specifically comprises the following steps:
firstly, lofting longitudinal and transverse cross axes and pile position centers of the steel cofferdam after the laying of an assembly platform is finished, and then assembling the steel cofferdam according to the lofted points;
after the welding of steel cofferdam bottom plate fossil fragments finishes, installation cofferdam bottom plate fossil fragments 1, the fixed guide ring under and the activity guide ring 2 under the activity of installation on the bottom plate fossil fragments, the guide ring is used for steel casing accurate positioning under the activity, and the positioning bolt hole plane position should be strictly controlled within 5mm during processing to ensure inserting and beating smoothly of casing, fixed guide ring down is that the steel casing sinks to lead fixedly and transmits the whole horizontal extrusion force that receives the rivers impact production of cofferdam.
In addition, a cofferdam top plate keel 3 is installed, a fixed upper guide ring and a movable upper guide ring 4 are installed on the top plate keel, the plane position precision of each guide ring is strictly controlled, and the correct relative position of the guide ring and the longitudinal and transverse axes of the steel cofferdam is ensured. The fixed upper guide ring is a pile casing inserting and beating initial positioning guide device and transmits horizontal extrusion force generated by water flow impact on the whole cofferdam, and the accurate size of the central ring is ensured during manufacturing, so that the pile casing is inserted and beaten smoothly. The movable upper guide ring is used as a pile casing inserting and beating positioning guide device and transmits horizontal force transmitted by the fixed upper guide ring of the cofferdam, so that pile casing inserting and beating precision is ensured. Generally, the movable upper guide ring and the movable lower guide ring are concentrically arranged, and the fixed upper guide ring and the fixed lower guide ring are concentrically arranged. The plane error of the upper guide ring and the fixed upper guide ring is controlled within 5mm, and the plane error of the lower guide ring and the fixed lower guide ring is controlled within 5 mm.
And (5) checking the ejector rods 5 of the upper movable guide rings and correspondingly debugging to ensure that the upper movable guide rings can work normally. When the steel cofferdam is positioned in the water, the top push rods of the upper movable guide rings are adjusted to be in a tightening state to ensure that the steel casing 12 is smoothly lowered.
Adjusting the steel cofferdam inserting and punching hole position to a designed pile position, lowering the steel casing to the bottom of a river bed according to the designated pile position under the condition that the cofferdam is horizontal, and fixing the plane position of the steel casing by utilizing a movable lower guide ring, wherein the movable lower guide ring can be used for fixing the steel casing through adjustment;
adjusting the verticality of the steel casing, measuring the error between the center of the steel casing and the center of the designed pile position (generally, the length of an upper guide ring pushing rod is adjusted to control a hoop to move back and forth so as to adjust the verticality of the steel casing), and if the requirement is met, extending out a pushing rod to push the hoop against the steel casing so as to prevent the pile position from being displaced during inserting and driving; and if the steel casing is not qualified, repeatedly lowering and adjusting, and then inserting and beating the steel casing.
After the first positioning pile is inserted and beaten, the plane position of the steel cofferdam can be finely adjusted by utilizing the reaction force through adjusting the ejector rod, so that the steel cofferdam reaches higher precision, and the operation is repeated until all the steel pile casings are inserted and beaten.
Before launching the cofferdam, the movable lower guide ring and the fixed lower guide ring are positioned by using a bolt plane, the tail part of the movable lower guide ring and the fixed lower guide ring are supported by adopting a filling plate, and then a tail bolt is screwed down to prevent the movable lower guide ring from falling and shifting in the floating transportation and inserting process of the cofferdam.
In an alternative embodiment, the movable upper guide ring comprises an ejector rod 5 mounted on a guide box 6, and a linkage rod 7 is arranged at the front end of the ejector rod and connected with a clamp 8 through a pin 9. Generally, a dip pad 10 is provided between the yoke and the guide box. A base 11 is fixed under the guide box and is welded with the fixed upper guide ring. Correspondingly, a fixed seat used for being fixedly connected with the fixed lower guide ring can be arranged on the movable lower guide ring.
Before the steel casing is inserted and beaten, firstly measuring the error between the center of the steel casing and the center of the designed pile position, if the error meets the requirement, driving a push rod to extend out, and pushing a hoop against the steel casing; and if the error is unqualified after the measurement, repeatedly lowering and adjusting the steel casing.
The invention solves the technical problem that the plane position of the double-wall steel suspension box cofferdam can not be accurately positioned when the steel pile casing is inserted and beaten, and according to the construction requirement, the pile position positioning allowable deviation of the foundation pile is 50mm, and the accurate positioning method of the upper movable guide ring and the lower movable guide ring of the double-wall steel suspension box cofferdam is researched and developed according to the structural stress analysis and measurement theoretical knowledge of the steel cofferdam. Through field construction practice, the method is safe and reliable and meets the requirement of construction precision.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (8)
1. The method for accurately positioning the inserting and beating of the steel casing of the double-wall steel suspension box cofferdam is characterized by comprising the following steps of:
lofting the longitudinal and transverse axes of the cofferdam and the central hole site of each pile position;
assembling cofferdams according to lofting point positions;
installing a cofferdam bottom plate keel, and installing a fixed lower guide ring and a movable lower guide ring on the bottom plate keel;
installing a cofferdam top plate keel, and installing a fixed upper guide ring and a movable upper guide ring on the top plate keel;
adjusting the push rod of each movable upper guide ring to a tightening state, then launching the cofferdam, and adjusting the inserting and punching hole position of the cofferdam to the designed pile position;
under the condition that the cofferdam is horizontal, lowering the steel casing to the bottom of the river bed according to the designated pile position, and fixing the plane position of the steel casing by utilizing a movable lower guide ring;
the length of the movable upper guide ring pushing rod is adjusted to control the hoop to move back and forth so as to adjust the verticality of the steel casing, and the steel casing is inserted and beaten;
after the first positioning pile is inserted and beaten, the plane position of the cofferdam is finely adjusted by adjusting the ejector pin, so that the cofferdam reaches higher precision, and the rest is done in sequence until all the steel pile casings are inserted and beaten.
2. The method for accurately positioning the inserting and beating of the steel casing of the double-wall steel suspension box cofferdam according to claim 1, characterized in that: before launching the cofferdam, the movable lower guide ring and the fixed lower guide ring are positioned by a bolt plane, the tail part of the movable lower guide ring and the fixed lower guide ring are supported by a filling plate, and then a tail bolt is screwed down.
3. The method for accurately positioning the inserting and beating of the steel casing of the double-wall steel suspension box cofferdam according to claim 1, characterized in that: the movable upper guide ring comprises a push rod arranged on the guide box, the front end of the push rod is provided with a linkage rod, and the linkage rod is connected with the hoop through a pin.
4. The method for accurately positioning the inserting and beating of the steel casing of the double-wall steel suspension box cofferdam according to claim 1, characterized in that: the movable upper guide ring and the movable lower guide ring are concentrically arranged.
5. The method for accurately positioning the inserting and beating of the steel casing of the double-wall steel suspension box cofferdam according to claim 1 or 4, characterized in that: the fixed upper guide ring and the fixed lower guide ring are concentrically arranged.
6. The method for accurately positioning the inserting and beating of the steel casing of the double-wall steel suspension box cofferdam according to claim 1, characterized in that: before the steel casing is inserted and beaten, firstly measuring the error between the center of the steel casing and the center of the designed pile position, if the error meets the requirement, driving a push rod to extend out, and pushing a hoop against the steel casing; and if the error is unqualified after the measurement, repeatedly lowering and adjusting the steel casing.
7. The method for accurately positioning the inserting and beating of the steel casing of the double-wall steel suspension box cofferdam according to claim 1, characterized in that: the plane error of the upper guide ring and the fixed upper guide ring is controlled within 5 mm.
8. The method for accurately positioning the inserting and beating of the steel casing of the double-wall steel suspension box cofferdam according to claim 1, characterized in that: the plane error of the lower guide ring and the fixed lower guide ring is controlled within 5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911100718.7A CN110939147A (en) | 2019-11-12 | 2019-11-12 | Method for accurately positioning inserting and beating steel casing of double-wall steel suspension box cofferdam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911100718.7A CN110939147A (en) | 2019-11-12 | 2019-11-12 | Method for accurately positioning inserting and beating steel casing of double-wall steel suspension box cofferdam |
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| CN110939147A true CN110939147A (en) | 2020-03-31 |
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| CN201911100718.7A Pending CN110939147A (en) | 2019-11-12 | 2019-11-12 | Method for accurately positioning inserting and beating steel casing of double-wall steel suspension box cofferdam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718097A (en) * | 2022-04-25 | 2022-07-08 | 中交第二航务工程局有限公司 | Quick positioning method for deep water steel cofferdam or open caisson |
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| CN101205720A (en) * | 2007-12-05 | 2008-06-25 | 中铁大桥局股份有限公司 | Down-lying, bed-contacting and sinking control technologies of super large steel cofferdam |
| JP6010070B2 (en) * | 2014-07-03 | 2016-10-19 | オリエンタル白石株式会社 | Temporary closing method for existing underwater structures |
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2019
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| CN101182718A (en) * | 2007-12-05 | 2008-05-21 | 中铁大桥局股份有限公司 | Under water putting down construction method of large-sized double-walled steel suspension box-cofferdam |
| CN101205720A (en) * | 2007-12-05 | 2008-06-25 | 中铁大桥局股份有限公司 | Down-lying, bed-contacting and sinking control technologies of super large steel cofferdam |
| JP6010070B2 (en) * | 2014-07-03 | 2016-10-19 | オリエンタル白石株式会社 | Temporary closing method for existing underwater structures |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718097A (en) * | 2022-04-25 | 2022-07-08 | 中交第二航务工程局有限公司 | Quick positioning method for deep water steel cofferdam or open caisson |
| CN114718097B (en) * | 2022-04-25 | 2023-09-22 | 中交第二航务工程局有限公司 | Quick positioning method for deepwater steel cofferdam or open caisson |
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