CN104314011B - A kind of concrete construction method of cushion cap under water - Google Patents
A kind of concrete construction method of cushion cap under water Download PDFInfo
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- CN104314011B CN104314011B CN201410648098.1A CN201410648098A CN104314011B CN 104314011 B CN104314011 B CN 104314011B CN 201410648098 A CN201410648098 A CN 201410648098A CN 104314011 B CN104314011 B CN 104314011B
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- cushion cap
- concrete
- water
- steel pipe
- cement
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
Abstract
A concrete construction method for cushion cap under water, comprises the following steps: preparation of construction, surveying and locating, the stake of perfusion cushion cap, prepare cuboid-type cement cushion cap matrix and concreting.This method simplifies underwater gliders operation, saves the activity duration, improves efficiency, ensure that construction quality; Need to take out water problem when avoiding large area cast underwater concrete, the operation used time is shortened greatly.
Description
Technical field
The present invention relates to the realm of building construction, particularly relate to a kind of concrete construction method of cushion cap under water.
Background technology
The form of the many employings of major diameter base columnar pier one post applied in bridge construction in recent years, for grouped piles cap bridge aesthetically, how cushion cap bottom surface is placed in below ordinary water level.Because working water level is lower than ordinary water level, if cushion cap is all more than working water level during construction, then can construct according to a conventional method.If cushion cap some under water, then usually take the method for steel jacket box to construct.But whole cushion cap is all in below the water surface during construction, and the volume ratio of cushion cap is comparatively large, and the general steel jacket box that adopts is constructed, because deepwater work hydraulic pressure is high, and the gap sealing difficulty that steel bushing is assembled.For overcoming buoyancy of water, the steel input amount of steel jacket box is large, the rate of recovery is low, diving operation is many, and extends construction period, adds construction cost, can cause the defect of pile foundation during pile sinking.
In addition, the filling concrete construction of cushion cap under water adopts tremie method usually, because there are mud or ponding in filling concrete dummy pipe inside, therefore needs to arrange water barrier device in conduit during first filling concrete.Water barrier device is sphere (cutting ball), the cement mortar made of ball or other material normally.When large area build underwater concrete arrange many conduits time, follow-up conduit internal water accumulation need be extracted out with submersible pump, could start the perfusion of underwater concrete.Which increase submersible pump to draw water operation, the underwater concreting time is longer; And mud dregs is easily brought in concrete and is affected concrete density when inserting concrete by further conduit; Ponding in conduit is difficult to pump, and easily forms interlayer, affects the density of underwater concrete.
Summary of the invention
For solving the deficiency that prior art exists, the object of the present invention is to provide a kind of concrete construction method of cushion cap under water, construction cost is low to reach, short construction period, the effect that quality is high.
For achieving the above object, the present invention has come by following technical solution, and a kind of concrete construction method of cushion cap under water, comprises the following steps:
(1) preparation of construction
According to construction speed requirement, make material planning, carry out centralized purchasing, control the quality specifications using material simultaneously, require the selection of material according to design structure, the work of confiding a technological secret on then constructing;
(2) surveying and locating
Status requirement according to working design carries out setting-out to the cushion cap that will carry out subaqueous construction, and setting-out goes out the position of cushion cap stake;
(3) cushion cap stake is poured into
It is the distribution of 20 × 40m rectangle corner by four DN250-DN450 steel pipes, movable drain plug be arranged on the lower end of steel pipe and seal, described movable drain plug comprises the conduit that can insert in steel pipe, conduit external diameter is consistent with steel pipe interior diameter, pipe inner wall top arranges the reverse V-shaped junction button of A/C, described reverse V-shaped junction button can either prevent movable drain plug from dropping when conduit is transferred, make again movable drain plug can wash open under the effect of filling concrete pressure, conduit lower end arranges the plug steel plate that comprehensively can cover steel tube head, plug steel plate is provided with perforate, plug steel plate bottom arranges drag reduction conehead, perforate connecting steel wire ropes, wire rope is caused more than the water surface, control steel pipe by hydraulic vibration driver at the uniform velocity to sink steadily, directly pre-buried to precalculated position, to pouring concrete within steel pipe, carry steel pipe simultaneously, concrete is flowed out from steel pipe lower end, utilizes wire rope movable drain plug to be left the water, in steel pipe, concrete perfusion is to steel pipe mid-height, in steel pipe, central axis plugs spacer bars, spacer bars is I level or II level reinforcing bar, in steel pipe, then continues concrete perfusion to design height after coagulation to make spacer bars spill stake top 30-50cm, this concrete is for comprising cement, yellow ground, rubble, water reducing agent, silicon ash, corrosion inhibitor and water, and described strength grade of concrete is higher than C60, and in concrete, the parts by weight of each component are respectively 1: 2.5: 5: 0.05: 1: 0.025: 3.5,
(4) cuboid-type cement cushion cap matrix is prepared
Described cuboid-type cement cushion cap matrix corner is provided with the stake holes with cushion cap stake matched in clearance, arranges watertight aircase around described cuboid-type cement cushion cap matrix, discharges watertight aircase afterwards and control cushion cap matrix is sunk; Build reinforcing cage in the side's of setting firmly above cushion cap matrix, the reinforcing bar that reinforcing cage is 18-20mm by diameter is made; Simultaneously around square build reinforcing cage, arrange integral mold plate, adopt 18 thick nine clamping plate as interior external mold, template peripheral hardware level and vertically enclose purlin, inner and outer template stay-bolt is relatively fixing through " splayed ironware ", makes template and reinforcing cage form an entirety; Then the spacer bars in step (3) is utilized to make stake holes and cushion cap stake matched in clearance, until the stake of cuboid-type cement cushion cap matrix cushion cap drops to the 1/3-1/2 place of the spacer bars side of arrival build reinforcing cage height in water under cushion cap matrix; Finally overall strong fix is carried out to cuboid-type cement cushion cap matrix;
(5) concreting
Arrange one or more cement based self-compaction material respectively to build a little and one or more high molecular weight water soluble polymer infusion point, cement based self-compaction material is built and a little all must be communicated with the square under water build reinforcing cage in step (4) with high molecular weight water soluble polymer infusion point; High molecular weight water soluble polymer is dissolved in the water and forms high molecular weight water soluble polymer solution, in square build reinforcing cage under water, high molecular weight water soluble polymer solution is injected by high molecular weight water soluble polymer infusion point, high molecular weight water soluble polymer dissolves thus changes the physical property of water in water, cement based self-compaction material is entered in high molecular weight water soluble polymer solution and does not disperse; Build a little to joints cement base self-compaction material in water by cement based self-compaction material, casting process need not vibrate, rely on the deadweight of cement based self-compaction material by closely knit for square build reinforcing cage filling under water and finally form non-dispersible underwater concrete, until reach absolute altitude requirement, finally cushion cap has been built under water.
Preferably, the surveying and locating in described step (2) utilizes GPS and carries out waterborne or subaqueous survey in conjunction with level gauge.
In above-mentioned either a program preferably, the silicon ash adopted in described step (3) is activated grammite; Described water reducing agent is naphthalene sulfonate water reducing agent, is selected from ZWL-II type or HSP-NGX type water reducing agent.
In above-mentioned either a program preferably, the mixture that the corrosion inhibitor adopted in the step (3) is triethanolamine, monoethanolamine and K-16 reinforcing steel bar corrosion inhibitor are composited with mass ratio 1.5: 2: 0.5.
In above-mentioned either a program preferably, the splayed ironware of outside welding central aperture in reinforcing cage in step (4), spacing 1 meter, as concrete cover cushion block and fixed form install.
In above-mentioned either a program preferably, when being obstructed in the cuboid-type cement cushion cap matrix sinking watching described in step (4), suction mud or setting-out method of leaping high is adopted to assist cuboid-type cement cushion cap matrix to sink.
In above-mentioned either a program preferably, the high molecular weight water soluble polymer in step (5) is one or more in polyacrylamide, polyethylene glycol oxide and copolymer thereof.
In above-mentioned either a program preferably, cement based self-compaction material is self-compacting concrete, adopt Control Measures for Concrete Slump divergence testing inspection, in air and underwater environment, cement based self-compaction material slump consistancy test value is 230-240mm, and divergence test value is 550-650mm.
The invention has the beneficial effects as follows:
1. quick construction of the present invention, time and labour saving, improves efficiency of construction, the reduction of erection time.
2. when method of the present invention simplifies underwater gliders, intubate operation, saves the activity duration, improves efficiency; Conduit is all-sealed structure, eliminates sediment and conduit internal water accumulation under water and, on the impact of concrete density, ensure that construction quality; Need to take out water problem when avoiding large area cast underwater concrete, the operation used time is shortened greatly.
3. do not need in cement based self-compaction material of the present invention to add the anti-dispersion class Admixture under water such as tackifier, flocculant, the cost of underwater concrete construction can be reduced.
4. method of the present invention greatly reduces human and material resources and material, remarkable in economical benefits, protection of the environment; Effectively improve the precision when constructing, reducing deviation, improve construction quality.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the invention will be further described.
Embodiment
A concrete construction method for cushion cap under water, comprises the following steps:
(1) preparation of construction
According to construction speed requirement, make material planning, carry out centralized purchasing, control the quality specifications using material simultaneously, require the selection of material according to design structure, the work of confiding a technological secret on then constructing.
(2) surveying and locating
Status requirement according to working design carries out setting-out to the cushion cap that will carry out subaqueous construction, and setting-out goes out the position of cushion cap stake; This surveying and locating utilizes GPS and carries out waterborne or subaqueous survey in conjunction with level gauge.
(3) cushion cap stake is poured into
It is the distribution of 20 × 40m rectangle corner by four DN250-DN450 steel pipes, movable drain plug be arranged on the lower end of steel pipe and seal, described movable drain plug comprises the conduit that can insert in steel pipe, conduit external diameter is consistent with steel pipe interior diameter, pipe inner wall top arranges the reverse V-shaped junction button of A/C, described reverse V-shaped junction button can either prevent movable drain plug from dropping when conduit is transferred, make again movable drain plug can wash open under the effect of filling concrete pressure, conduit lower end arranges the plug steel plate that comprehensively can cover steel tube head, plug steel plate is provided with perforate, plug steel plate bottom arranges drag reduction conehead, perforate connecting steel wire ropes, wire rope is caused more than the water surface, control steel pipe by hydraulic vibration driver at the uniform velocity to sink steadily, directly pre-buried to precalculated position, to pouring concrete within steel pipe, carry steel pipe simultaneously, concrete is flowed out from steel pipe lower end, utilizes wire rope movable drain plug to be left the water, in steel pipe, concrete perfusion is to steel pipe mid-height, in steel pipe, central axis plugs spacer bars, spacer bars is I level or II level reinforcing bar, in steel pipe, then continues concrete perfusion to design height after coagulation to make spacer bars spill stake top 30-50cm, this concrete is for comprising cement, yellow ground, rubble, water reducing agent, silicon ash, corrosion inhibitor and water, and described strength grade of concrete is higher than C60, and in concrete, the parts by weight of each component are respectively 1: 2.5: 5: 0.05: 1: 0.025: 3.5, the silicon ash adopted is activated grammite, described water reducing agent is naphthalene sulfonate water reducing agent, is selected from ZWL-II type or HSP-NGX type water reducing agent.The mixture that the corrosion inhibitor adopted is triethanolamine, monoethanolamine and K-16 reinforcing steel bar corrosion inhibitor are composited with mass ratio 1.5: 2: 0.5.
(4) cuboid-type cement cushion cap matrix is prepared
Described cuboid-type cement cushion cap matrix corner is provided with the stake holes with cushion cap stake matched in clearance, arranges watertight aircase around described cuboid-type cement cushion cap matrix, discharges watertight aircase afterwards and control cushion cap matrix is sunk; Build reinforcing cage in the side's of setting firmly above cushion cap matrix, the reinforcing bar that reinforcing cage is 18-20mm by diameter is made; Simultaneously around square build reinforcing cage, arrange integral mold plate, adopt 18 thick nine clamping plate as interior external mold, template peripheral hardware level and vertically enclose purlin, inner and outer template stay-bolt is relatively fixing through " splayed ironware ", makes template and reinforcing cage form an entirety; Then the spacer bars in step (3) is utilized to make stake holes and cushion cap stake matched in clearance, until the stake of cuboid-type cement cushion cap matrix cushion cap drops to the 1/3-1/2 place of the spacer bars side of arrival build reinforcing cage height in water under cushion cap matrix; Finally overall strong fix is carried out to cuboid-type cement cushion cap matrix; The splayed ironware of outside welding central aperture in reinforcing cage, spacing 1 meter, as concrete cover cushion block and fixed form install.When being obstructed in cuboid-type cement cushion cap matrix sinking watching, suction mud or setting-out method of leaping high is adopted to assist cuboid-type cement cushion cap matrix to sink.
(5) concreting
Arrange one or more cement based self-compaction material respectively to build a little and one or more high molecular weight water soluble polymer infusion point, cement based self-compaction material is built and a little all must be communicated with the square under water build reinforcing cage in step (4) with high molecular weight water soluble polymer infusion point; High molecular weight water soluble polymer is dissolved in the water and forms high molecular weight water soluble polymer solution, in square build reinforcing cage under water, high molecular weight water soluble polymer solution is injected by high molecular weight water soluble polymer infusion point, high molecular weight water soluble polymer dissolves thus changes the physical property of water in water, cement based self-compaction material is entered in high molecular weight water soluble polymer solution and does not disperse; Build a little to joints cement base self-compaction material in water by cement based self-compaction material, casting process need not vibrate, rely on the deadweight of cement based self-compaction material by closely knit for square build reinforcing cage filling under water and finally form non-dispersible underwater concrete, until reach absolute altitude requirement, finally cushion cap has been built under water.Wherein, high molecular weight water soluble polymer is one or more in polyacrylamide, polyethylene glycol oxide and copolymer thereof.Cement based self-compaction material is self-compacting concrete, and adopt Control Measures for Concrete Slump divergence testing inspection, in air and underwater environment, cement based self-compaction material slump consistancy test value is 230-240mm, and divergence test value is 550-650mm.
In addition, the concrete adopted when pouring into cushion cap stake takes following method to prepare:
A. taking raw material by the proportioning of described weight portion, water reducing agent, corrosion inhibitor are dissolved in the mixing water of 50% weight, stirring 3 ~ 5 minutes to leaving standstill without precipitation;
B. cement, yellow ground, rubble and silicon ash are put into mixer dry mixing 3 ~ 5 minutes in proportion, then add 1/2 mix and blend 5 ~ 10 minutes of the liquid that step a obtains;
C. the residue 1/2 of liquid that residue mixing water and step a obtain is added in the Solid-liquid mixture that step b obtains and stir 5 ~ 10 minutes, finally this concrete obtained.
The obtained concrete of the method enables each raw material fully mix and react, such that mortar matrix density is higher, corrosion-prevention rust-resistance ability better, has excellent adhesive property, volume stability and application property.
Each step in the inventive method is all optimal selections, can realize the optimal effectiveness of the inventive method.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (8)
1. a concrete construction method for cushion cap under water, is characterized in that comprising the following steps:
(1) preparation of construction
According to construction speed requirement, make material planning, carry out centralized purchasing, control the quality specifications using material simultaneously, require the selection of material according to design structure, the work of confiding a technological secret on then constructing;
(2) surveying and locating
Status requirement according to working design carries out setting-out to the cushion cap that will carry out subaqueous construction, and setting-out goes out the position of cushion cap stake;
(3) cushion cap stake is poured into
It is the distribution of 20 × 40m rectangle corner by four DN250-DN450 steel pipes, movable drain plug be arranged on the lower end of steel pipe and seal, described movable drain plug comprises the conduit that can insert in steel pipe, conduit external diameter is consistent with steel pipe interior diameter, pipe inner wall top arranges the reverse V-shaped junction button of A/C, described reverse V-shaped junction button can either prevent movable drain plug from dropping when conduit is transferred, make again movable drain plug can wash open under the effect of filling concrete pressure, conduit lower end arranges the plug steel plate that comprehensively can cover steel tube head, plug steel plate is provided with perforate, plug steel plate bottom arranges drag reduction conehead, perforate connecting steel wire ropes, wire rope is caused more than the water surface, control steel pipe by hydraulic vibration driver at the uniform velocity to sink steadily, directly pre-buried to precalculated position, to pouring concrete within steel pipe, carry steel pipe simultaneously, concrete is flowed out from steel pipe lower end, utilizes wire rope movable drain plug to be left the water, in steel pipe, concrete perfusion is to steel pipe mid-height, in steel pipe, central axis plugs spacer bars, spacer bars is I level or II level reinforcing bar, in steel pipe, then continues concrete perfusion to design height after coagulation to make spacer bars spill stake top 30-50cm, this concrete is for comprising cement, yellow ground, rubble, water reducing agent, silicon ash, corrosion inhibitor and water, and described strength grade of concrete is higher than C60, and in concrete, the parts by weight of each component are respectively 1: 2.5: 5: 0.05: 1: 0.025: 3.5,
(4) cuboid-type cement cushion cap matrix is prepared
Described cuboid-type cement cushion cap matrix corner is provided with the stake holes with cushion cap stake matched in clearance, arranges watertight aircase around described cuboid-type cement cushion cap matrix, discharges watertight aircase afterwards and control cushion cap matrix is sunk; Build reinforcing cage in the side's of setting firmly above cushion cap matrix, the reinforcing bar that reinforcing cage is 18-20mm by diameter is made; Simultaneously around square build reinforcing cage, arrange integral mold plate, adopt 18 thick nine clamping plate as interior external mold, template peripheral hardware level and vertically enclose purlin, inner and outer template stay-bolt is relatively fixing through " splayed ironware ", makes template and reinforcing cage form an entirety; Then the spacer bars in step (3) is utilized to make stake holes and cushion cap stake matched in clearance, until the stake of cuboid-type cement cushion cap matrix cushion cap drops to the 1/3-1/2 place of the spacer bars side of arrival build reinforcing cage height in water under cushion cap matrix; Finally overall strong fix is carried out to cuboid-type cement cushion cap matrix;
(5) concreting
Arrange one or more cement based self-compaction material respectively to build a little and one or more high molecular weight water soluble polymer infusion point, cement based self-compaction material is built and a little all must be communicated with the square under water build reinforcing cage in step (4) with high molecular weight water soluble polymer infusion point; High molecular weight water soluble polymer is dissolved in the water and forms high molecular weight water soluble polymer solution, in square build reinforcing cage under water, high molecular weight water soluble polymer solution is injected by high molecular weight water soluble polymer infusion point, high molecular weight water soluble polymer dissolves thus changes the physical property of water in water, cement based self-compaction material is entered in high molecular weight water soluble polymer solution and does not disperse; Build a little to joints cement base self-compaction material in water by cement based self-compaction material, casting process need not vibrate, rely on the deadweight of cement based self-compaction material by closely knit for square build reinforcing cage filling under water and finally form non-dispersible underwater concrete, until reach absolute altitude requirement, finally cushion cap has been built under water.
2. the concrete construction method of cushion cap under water according to claim 1, is characterized in that the surveying and locating in described step (2) utilizes GPS and carries out waterborne or subaqueous survey in conjunction with level gauge.
3. the concrete construction method of cushion cap under water according to claim 1 and 2, is characterized in that the silicon ash adopted in described step (3) is activated grammite; Described water reducing agent is naphthalene sulfonate water reducing agent, is selected from ZWL-II type or HSP-NGX type water reducing agent.
4. the concrete construction method of cushion cap under water according to claim 3, the mixture that the corrosion inhibitor that it is characterized in that adopting in the step (3) is triethanolamine, monoethanolamine and K-16 reinforcing steel bar corrosion inhibitor are composited with mass ratio 1.5: 2: 0.5.
5. the concrete construction method of cushion cap under water according to claim 4, is characterized in that the splayed ironware of welding central aperture in outside in reinforcing cage in step (4), spacing 1 meter, as concrete cover cushion block and fixed form install.
6. the concrete construction method of the cushion cap under water according to claim 4 or 5, when it is characterized in that being obstructed in the cuboid-type cement cushion cap matrix sinking watching described in step (4), suction mud or setting-out method of leaping high is adopted to assist cuboid-type cement cushion cap matrix to sink.
7. the concrete construction method of cushion cap under water according to claim 6, the high molecular weight water soluble polymer that it is characterized in that in step (5) is one or more in polyacrylamide, polyethylene glycol oxide and copolymer thereof.
8. the concrete construction method of cushion cap under water according to claim 7, it is characterized in that cement based self-compaction material is self-compacting concrete, adopt Control Measures for Concrete Slump divergence testing inspection, in air and underwater environment, cement based self-compaction material slump consistancy test value is 230-240mm, and divergence test value is 550-650mm.
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| CN201410648098.1A CN104314011B (en) | 2014-11-17 | 2014-11-17 | A kind of concrete construction method of cushion cap under water |
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| CN201410648098.1A CN104314011B (en) | 2014-11-17 | 2014-11-17 | A kind of concrete construction method of cushion cap under water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104775354B (en) * | 2015-03-31 | 2016-07-06 | 中交第二航务工程局有限公司 | A kind of large volume bridge bearing platform structure and construction method |
| CN105484280B (en) * | 2015-12-30 | 2018-12-21 | 安徽上能管桩混凝土有限公司 | The prefabricated cushion cap of anticorrosive industrial premises concrete rim of a cup formula |
| CN105696468B (en) * | 2016-04-20 | 2017-06-16 | 中铁建港航局集团路桥工程有限公司 | Underwater concreting method in the construction of water Bridge |
| CN106049499B (en) * | 2016-06-27 | 2018-04-10 | 航天建设集团深圳有限公司 | Seamless harbor work's finished concrete composite construction in a kind of water |
| CN106013156B (en) * | 2016-06-27 | 2018-04-10 | 航天建设集团深圳有限公司 | Seamless harbor work's finished concrete composite construction method of construction in a kind of water |
| CN106351241B (en) * | 2016-08-28 | 2020-07-28 | 中铁二十局集团有限公司 | Construction method of deep water foundation of large-span continuous beam next to existing line |
| CN106988332A (en) * | 2017-03-03 | 2017-07-28 | 中国十七冶集团有限公司 | A kind of ultra-deep waters aquatic pile foundation construction method |
| CN108755731A (en) * | 2018-07-18 | 2018-11-06 | 中国电建集团中南勘测设计研究院有限公司 | A kind of well foundation and construction method |
| CN109183827A (en) * | 2018-09-18 | 2019-01-11 | 何文峰 | Underwater reinforced concrete foundation construction operation engineering method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2946137B2 (en) * | 1991-12-04 | 1999-09-06 | 大成建設株式会社 | Construction method of temporary deadline |
| JP2005320827A (en) * | 2004-05-11 | 2005-11-17 | Rikogaku Shinkokai | Steel material anticorrosion method in underwater concrete construction method |
| CN100591863C (en) * | 2007-10-19 | 2010-02-24 | 山东高速青岛公路有限公司 | Underwater no-bottom closing concrete boxed cofferdam and method of use thereof |
| CN101205721A (en) * | 2007-12-03 | 2008-06-25 | 中铁大桥局集团第四工程有限公司 | Method for surrounding water by combination of steel cofferdam and heavy-pressure rotary-spraying pile in deep-water low-pile cap construction |
| CN102720140B (en) * | 2012-07-12 | 2015-03-25 | 中铁二十局集团第一工程有限公司 | Large-span prestress concrete continuous beam deepwater pier construction process |
| CN102877420A (en) * | 2012-11-06 | 2013-01-16 | 中铁二十二局哈尔滨铁路建设集团有限责任公司 | Construction method of large tube well fixed point precipitation, sealing bottom free concrete and steel sheet pile cofferdam deepwater bearing platform |
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