CN110939145A - Launching method of double-wall steel suspension box cofferdam under condition of tidal alternating current in typhoon area - Google Patents
Launching method of double-wall steel suspension box cofferdam under condition of tidal alternating current in typhoon area Download PDFInfo
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- CN110939145A CN110939145A CN201911100107.2A CN201911100107A CN110939145A CN 110939145 A CN110939145 A CN 110939145A CN 201911100107 A CN201911100107 A CN 201911100107A CN 110939145 A CN110939145 A CN 110939145A
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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
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Abstract
The invention provides a method for launching a double-wall steel hanging box cofferdam under the condition of tidal current in a typhoon area, which comprises the following steps of firstly processing the cofferdam in blocks; then assembling and splicing the cofferdam on the bottom supporting plate, laying an air bag, then arranging a variable-gradient downward slope in the launching direction of the cofferdam, pushing the cofferdam from the rear side of the cofferdam by utilizing two excavators, and slowly releasing the control device; after the center of the cofferdam passes through the first slope changing point, the pushing operation of the excavator is stopped, and the cofferdam moves downwards by virtue of the dead weight and the generated downward sliding component force; and (5) pulling a cable after cutting off, and filling water into the cofferdam. The cofferdam launching construction is carried out by applying the method provided by the invention, the requirements on the site and the river channel are not high, the requirements can be basically met only by simple treatment, meanwhile, the use of large-scale equipment is avoided, the construction cost is lower, and the construction method is safe and reliable.
Description
Technical Field
The invention belongs to the technical field of cofferdam construction, and particularly relates to a launching method of a double-wall steel suspension box cofferdam under the condition of tidal reciprocating flow in a typhoon area.
Background
In the integral launching construction of the large steel cofferdam of the bridge deep water foundation, a method of integrally hoisting a floating crane into water, hoisting a gantry crane into water, dragging an upper semi-submerged barge to carry floating in place and then submerging the upper semi-submerged barge into water is generally adopted. However, under the conditions that a large ship cannot enter due to the restriction of the navigation height of bridges upstream and downstream of a river channel, or the influence of wind, waves and tides, and the like, and the cofferdam structure is not suitable for the integral hoisting of a floating crane, the conventional launching method cannot be applied, or the construction cost is too high, and improvement is needed urgently.
Disclosure of Invention
In view of the above, the invention provides a method for launching a double-wall steel suspension box cofferdam in a typhoon area under the condition of tidal reciprocating flow, aiming at overcoming the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for launching a double-wall steel suspension box cofferdam under the condition of tidal alternating current in a typhoon area comprises the following steps:
processing the cofferdam in blocks;
arranging a steel stool and a cushion beam in the assembling area to form a supporting structure, and paving a bottom supporting plate on the supporting structure;
assembling and splicing a cofferdam on the bottom supporting plate;
arranging air bags in the gap of the steel stool, arranging the air bags in parallel at intervals in the cofferdam launching direction, wherein each air exhaust bag comprises two air exhaust bags which are symmetrically arranged at the left side and the right side of the cofferdam launching direction;
arranging a variable-gradient downslide ramp in the launching direction of the cofferdam, wherein the downslide ramp comprises at least two variable-gradient points;
a control device for controlling the gliding speed and the approximate direction of the cofferdam is arranged behind the cofferdam;
pushing the cofferdam from the rear side of the cofferdam by using two excavators, and slowly releasing the control device;
after the center of the cofferdam passes through the first slope changing point, the pushing operation of the excavator is stopped, and the cofferdam moves downwards by virtue of the dead weight and the generated downward sliding component force;
when the front of the cofferdam is close to a water entry point, tightening a rear stay cable, and checking the air bag and the cofferdam;
and (5) pulling a cable after cutting off, and filling water into the cofferdam.
Further, the control device comprises earthworms, a rear pull cable is connected between the earthworms and the cofferdam and is wound and unwound through a winch.
Further, two excavators for pushing the cofferdam are symmetrically arranged on two sides of the cofferdam.
Further, when the front of the cofferdam approaches the range of 10m of the water entry point, the structures of the air bag, the cofferdam and the like and related equipment are inspected.
Furthermore, a section of slope slide way is formed between every two slope changing points of the gliding ramp.
Further, the downslide ramp includes three sections of slope slideways along the launching direction of the cofferdam, and the slope length of each section of slope slideway are respectively: 1: 25 degrees, 20 m; 1: 15 degrees, 10 m; 1: 10 degrees, 10 m.
And further, before the cofferdam is launched, reinforcing the downslide ramp, and sweeping the bed in advance at the launching position.
Further, in the process of pushing the cofferdam by using the excavator, the winch slowly releases the pull cable and always keeps the pull cable in a stressed state.
Further, 16-20 air bags are arranged.
Compared with the prior art, the invention has the following advantages:
the method provided by the invention is used for launching construction of the double-wall steel hanging box cofferdam, has low requirements on sites and river channels, can basically meet the requirements only by simple treatment, avoids using large-scale equipment, and has low construction cost and safe and reliable construction method.
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 layout view of an air bag on a bottom support plate in the invention;
fig. 2 is a schematic diagram before the cofferdam created by the invention is launched.
Description of reference numerals:
1-a bottom pallet; 2-cofferdam; 3-air bag; 4-a downslide ramp; 5-earthworm; 6-rear pull cable.
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.
A method for launching a double-wall steel suspension box cofferdam under the condition of tidal alternating current in a typhoon area as shown in figures 1 and 2 comprises the following steps:
firstly, processing cofferdams in blocks; then, arranging a steel stool and a cushion beam in the assembling area to form a supporting structure, and paving a bottom supporting plate 1 on the supporting structure, wherein the bottom supporting plate can effectively ensure that the air bag is level and stressed, and the stability of the air bag and the supporting plate on the whole structure is good;
then, assembling and splicing the cofferdam split bodies processed in blocks on the bottom supporting plate to form a cofferdam 2;
arranging air bags 3 in the steel stool gap, arranging the air bags side by side at intervals in the cofferdam launching direction, wherein each air exhaust bag comprises two air exhaust bags which are symmetrically arranged at the left side and the right side of the cofferdam launching direction; the number of the air bags is 16-20. In an alternative embodiment, the length of the air bag is 12m, the diameter of the air bag is 2m, and the steel stool is removed after the air bag is uniformly inflated according to preset parameters.
A variable-gradient downslide ramp 4 is arranged in the launching direction of the cofferdam, and comprises at least two variable-gradient points; usually, a section of slope slide is formed between every two slope changing points of the gliding slope. In an optional embodiment, the descending ramp includes three sections of slope slideways along the launching direction of the cofferdam, and the slope and the length of each section of slope slideway are respectively: 1: 25 degrees, 20 m; 1: 15 degrees, 10 m; 1: 10 degrees, 10 m. It should be noted that the total length of the downslide ramp is required to be greater than 1/2 of the length of the cofferdam, and the cofferdam can effectively generate a downslide force under the action of the component of gravity.
A control device for controlling the gliding speed and the approximate direction of the cofferdam is arranged behind the cofferdam; pushing the cofferdam from the rear side of the cofferdam by using two excavators, and slowly releasing a rear pull cable 6 of the control device;
after the center of the cofferdam passes through the first slope changing point, the pushing operation of the excavator is stopped, and the cofferdam mainly moves downwards by means of self weight and downward sliding generated by self weight;
when the front of the cofferdam is close to the water entry point by about 10m, tightening the rear stay cable, and checking the air bag and the cofferdam; if the distance between the front end of the cofferdam and the water inlet point is small, the cofferdam can be retreated for a certain distance by a mode of matching the pushing of the excavator and the cable retracting of the rear cable behind the air bag;
after inspection, the air bags and other equipment have no problems and the hydrological conditions reach the preset values, the cables are pulled after the cutting, the cofferdam enters water, and the water launching construction of the cofferdam is completed.
In an alternative embodiment, the control device comprises an earthworm 5, a rear pull cable is connected between the earthworm and the cofferdam, and the rear pull cable is wound and unwound through a winch.
Generally, in order to ensure the controllability of the pushing operation and the stability of the launching of the cofferdam, the two excavating machines for pushing the cofferdam are symmetrically arranged at the two sides of the cofferdam.
Before launching the cofferdam, the downslide ramp is generally reinforced, and the bed is swept in advance at the water-entering position to ensure that the water depth can meet the requirement of the cofferdam draught depth.
And after the downward sliding ramp is completely processed according to the design requirement, the cofferdam is pushed by two excavators to slowly slide towards the downward sliding ramp, before the pushing, a rear pull cable is connected with a preset position of the cofferdam in advance, in the pushing process of the excavators, the winch slowly releases the pull cable, the pull cable is always kept in a stressed state, and the advancing speed of the cofferdam is controlled.
When the gravity center of the cofferdam passes through a first slope changing point, the cofferdam is forwards inclined to generate a downward sliding component force, the two excavators stop pushing, the cofferdam can actively move forwards under the action of the downward sliding component force, and if the inclination angle of the cofferdam is insufficient, the downward sliding component force is too small, the height of the front and the rear of the cofferdam or the height of the left and the right air bags (which can be adjusted through deflation) can be adjusted at any time so as to achieve the downward sliding purpose. In the process of gliding, a professional needs to observe the gliding speed, direction, inclination angle, air pressure of the air bags and the like of the cofferdam at any time, and the quantity of the air bags is supplemented at the front end of the cofferdam at any time so as to ensure the uniform stress of the cofferdam.
When the front end of the cofferdam is close to the water inlet point within 10m, the rear stay cable is tightened, and the cofferdam stops sliding downwards. After the hydrological condition reaches the preset value, sending a professional to cut the back stay cable, the cofferdam can rapidly slide down and flush into water under the action of gravity, and after the cofferdam is completely submerged and the draft reaches the design, the submerged construction of the cofferdam by the air bag method can be completed.
The method provided by the invention is used for launching construction of the double-wall steel hanging box cofferdam, has low requirements on sites and river channels, can basically meet the requirements only by simple treatment, avoids using large-scale equipment, and has low construction cost and safe and reliable construction method.
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 (9)
1. A method for launching a double-wall steel suspension box cofferdam under the condition of tidal alternating current in a typhoon area is characterized by comprising the following steps:
processing the cofferdam in blocks;
arranging a steel stool and a cushion beam in the assembling area to form a supporting structure, and paving a bottom supporting plate on the supporting structure;
assembling and splicing a cofferdam on the bottom supporting plate;
arranging air bags in the gap of the steel stool, arranging the air bags in parallel at intervals in the cofferdam launching direction, wherein each air exhaust bag comprises two air exhaust bags which are symmetrically arranged at the left side and the right side of the cofferdam launching direction;
arranging a variable-gradient downslide ramp in the launching direction of the cofferdam, wherein the downslide ramp comprises at least two variable-gradient points;
a control device for controlling the gliding speed and the approximate direction of the cofferdam is arranged behind the cofferdam;
pushing the cofferdam from the rear side of the cofferdam by using two excavators, and slowly releasing the control device;
after the center of the cofferdam passes through the first slope changing point, stopping the pushing operation of the excavator;
when the front of the cofferdam is close to a water entry point, tightening a rear stay cable, and checking the air bag and the cofferdam;
and (5) pulling a cable after cutting off, and filling water into the cofferdam.
2. The launching method of the double-wall steel suspension box cofferdam under the condition of tidal alternating current of the typhoon area as claimed in claim 1, characterized in that: the control device comprises earthworms, a rear pull cable is connected between the earthworms and the cofferdam and is wound and unwound through a winch.
3. The launching method of the double-wall steel suspension box cofferdam under the condition of tidal alternating current of the typhoon area as claimed in claim 1, characterized in that: two excavators for pushing the cofferdam are symmetrically arranged at two sides of the cofferdam.
4. The launching method of the double-wall steel suspension box cofferdam under the condition of tidal alternating current of the typhoon area as claimed in claim 1, characterized in that: when the front of the cofferdam approaches the range of 10m of the water entry point, the air bag and the cofferdam are inspected.
5. The launching method of the double-wall steel suspension box cofferdam under the condition of tidal alternating current of the typhoon area as claimed in claim 1, characterized in that: and a section of slope slideway is formed between every two slope changing points of the downward sliding ramp.
6. The launching method of the double-wall steel suspension box cofferdam under the condition of tidal current in the typhoon area as claimed in claim 1 or 5, characterized in that: the downslide ramp includes three sections of slope slideways along the launching direction of the cofferdam, and the slope length of each section of slope slideway are respectively: 1: 25 degrees, 20 m; 1: 15 degrees, 10 m; 1: 10 degrees, 10 m.
7. The launching method of the double-wall steel suspension box cofferdam under the condition of tidal alternating current of the typhoon area as claimed in claim 1, characterized in that: before the cofferdam is launched, the downward-sliding ramp is reinforced, and the bed is swept in advance at the launching position.
8. The launching method of the double-wall steel suspension box cofferdam under the condition of tidal alternating current of the typhoon area as claimed in claim 1, characterized in that: in the process of pushing the cofferdam by using the excavator, the winch slowly releases the stay cable and always keeps the stay cable in a stressed state.
9. The launching method of the double-wall steel suspension box cofferdam under the condition of tidal alternating current of the typhoon area as claimed in claim 1, characterized in that: 16-20 air bags are arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911100107.2A CN110939145A (en) | 2019-11-12 | 2019-11-12 | Launching method of double-wall steel suspension box cofferdam under condition of tidal alternating current in typhoon area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911100107.2A CN110939145A (en) | 2019-11-12 | 2019-11-12 | Launching method of double-wall steel suspension box cofferdam under condition of tidal alternating current in typhoon area |
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| CN110939145A true CN110939145A (en) | 2020-03-31 |
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| CN201911100107.2A Pending CN110939145A (en) | 2019-11-12 | 2019-11-12 | Launching method of double-wall steel suspension box cofferdam under condition of tidal alternating current in typhoon area |
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| CN101033606A (en) * | 2007-03-23 | 2007-09-12 | 中铁大桥局集团第二工程有限公司 | Bridge heavy steel cofferdam gasbag watering method |
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| CN101775811A (en) * | 2010-03-22 | 2010-07-14 | 中交二公局第五工程有限公司 | Air-bag launching method of large steel overhead bin and cofferdam |
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| CN106703060A (en) * | 2017-03-01 | 2017-05-24 | 中国五冶集团有限公司 | Structure for launching open caisson through airbag method and launching method based on structure |
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2019
- 2019-11-12 CN CN201911100107.2A patent/CN110939145A/en active Pending
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| CN101033606A (en) * | 2007-03-23 | 2007-09-12 | 中铁大桥局集团第二工程有限公司 | Bridge heavy steel cofferdam gasbag watering method |
| KR100940795B1 (en) * | 2008-10-28 | 2010-02-04 | 곽대진 | Method for launching and transporting heavy weight structures using air bags |
| CN101775811A (en) * | 2010-03-22 | 2010-07-14 | 中交二公局第五工程有限公司 | Air-bag launching method of large steel overhead bin and cofferdam |
| CN102182149A (en) * | 2011-04-06 | 2011-09-14 | 中铁大桥局集团有限公司 | Method for entering river of parallel edges-free cofferdam with air bags |
| CN102852152A (en) * | 2012-09-29 | 2013-01-02 | 中铁八局集团第一工程有限公司 | Launching construction method of steel cofferdam suitable for shallow water area |
| CN106703060A (en) * | 2017-03-01 | 2017-05-24 | 中国五冶集团有限公司 | Structure for launching open caisson through airbag method and launching method based on structure |
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Application publication date: 20200331 |