CN106480897A - Large-scale well-sinking sinking construction method - Google Patents
Large-scale well-sinking sinking construction method Download PDFInfo
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- CN106480897A CN106480897A CN201510545152.4A CN201510545152A CN106480897A CN 106480897 A CN106480897 A CN 106480897A CN 201510545152 A CN201510545152 A CN 201510545152A CN 106480897 A CN106480897 A CN 106480897A
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Abstract
The invention discloses large-scale well-sinking sinking construction method, comprises the following steps：Step one, pre-cast sink well, caisson wall is poured making shaping；Step 2, well sinking, cut the earth in open caisson, so that open caisson is sink to below water level in advance, and inhale sand using sand system is inhaled；It is heavy that step 3, open caisson are helped, using slush pump inject on the outside of the open caisson wall thixotropic slurry carry out helping heavy, and help heavy during open caisson is rectified a deviation；Step 4, after open caisson sinks to designed elevation, carry out underwater concrete back cover.Present invention entirety operation is simple, convenient to carry out, low cost, during application of the present invention by the way of once sinking and non-drainage subsidence, can improve efficiency of construction, shorten construction period, and then easy to utilize.
Description
Technical field
The present invention relates to hydroelectric facility construction technology, specifically large-scale well-sinking sinking construction method.
Background technology
Drop shaft sinking construction method is widely used in municipal works, is usually used in the engineerings such as intake strucure, drainage pumping plant, large-scale sump, shield and upper pipe working well.For some large-scale well-sinkings, during well sinking, the frictional resistance effect powerful by layer of sand is run into, sinks and precipitation is difficult, if still using existing well sinking method construction, low construction efficiency, cycle are long, it is clear that can construction speed be caused to have a strong impact on.
Content of the invention
It is an object of the invention to overcoming the deficiencies in the prior art, there is provided a kind of energy lifting construction efficiency, the large-scale well-sinking sinking construction method of shortening construction period.
The present invention solves the above problems and is achieved through the following technical solutions：Large-scale well-sinking sinking construction method, comprises the following steps：
Step one, pre-cast sink well, caisson wall is poured making shaping；
Step 2, well sinking, cut the earth in open caisson, so that open caisson is sink to below water level in advance, and inhale sand using sand system is inhaled；
It is heavy that step 3, open caisson are helped, using slush pump inject on the outside of the open caisson wall thixotropic slurry carry out helping heavy, and help heavy during open caisson is rectified a deviation；
Step 4, after open caisson sinks to designed elevation, carry out underwater concrete back cover.
Further, the step one specifically includes following steps：The first segment cutting shoe of open caisson, second section cutting shoe, Section of three cutting shoe, bottom girder, partition wall are poured shaping by several times.The present invention is big for open caisson build, and total height is high, by the way of segmentation prefabricating, is easy to make shaping.
Further, the suction sand system includes sand sucker group, water charging system, electric power system, sand water discharge spout road and mortar sedimentation basin.During application of the present invention, the motor of sand sucker group should be maintained a certain distance with the water surface, prevented current from entering motor, caused short circuit；While will ensure impeller operationally all the time below the water surface, it is to avoid sky is taken out.
Further, the step 2 also includes to pour water into pit shaft, and it is higher than level of ground water to keep water level in pit shaft.The present invention makes water level in pit shaft higher than level of ground water, be avoided that generation quicksand phenomenon in construction.
Further, in the pit shaft, water level is not less than 0.5m with the water-head of level of ground water.
Further, the thixotropic slurry in the step 3 is made using bentonite, and is mixed with curing agent and retarder in manufacturing process.
Further, the correction operation of the step 3 specifically includes following steps：When open caisson run-off the straight, using sandstone bag to the slower side loading of sinking, or aspirating the side when sand is inhaled so as to which frictional force reduces, and to accelerate the subsidence velocity of the side, inclines until correcting more；When open caisson position shifts, open caisson inclined in opposite directions is made, then correct inclining, so operate repeatedly for several times, until the position for inclining side well body is effectively corrected.
Further, the step 4 observes 6～8 hours after open caisson sinks to designed elevation, if open caisson adds up deflection and is not more than 10mm, then carries out underwater concrete back cover.
In sum, the invention has the advantages that：（1）Present invention entirety operation is simple, facilitate implementation, low cost, the present invention is big for open caisson frictional resistance, buoyancy, the characteristic such as subsidence factor is less than normal, by the way of once sinking, and for water yield in open caisson is big, level of ground water is high, by the way of non-drainage subsidence, i.e. the present invention in implementation process using inside and outside well all not in precipitation, water shoveling band sink under water and the construction technology of back cover under water, construction period can be shortened, efficiency of construction is improved, easy to utilize.
（2）The present invention during well sinking using slush pump inject on the outside of the open caisson wall thixotropic slurry carry out helping heavy, the addition of thixotropic slurry, can reduce the frictional resistance between the borehole wall and the soil body, and thixotropic slurry voluntarily solidifies over time, stablizing for open caisson can be kept, reduces open caisson surface subsidence nearby.
Specific embodiment
With reference to embodiment, detailed description further is done to the present invention, but embodiments of the present invention not limited to this.
Embodiment：
Large-scale well-sinking sinking construction method, comprises the following steps：Step one, pre-cast sink well, caisson wall is poured making shaping；Step 2, well sinking, cut the earth in open caisson, so that open caisson is sink to below water level in advance, and inhale sand using sand system is inhaled；It is heavy that step 3, open caisson are helped, using slush pump inject on the outside of the open caisson wall thixotropic slurry carry out helping heavy, and help heavy during open caisson is rectified a deviation；Step 4, after open caisson sinks to designed elevation, carry out underwater concrete back cover.In the present embodiment, step one specifically includes following steps：The first segment cutting shoe of open caisson, second section cutting shoe, Section of three cutting shoe, bottom girder, partition wall are poured shaping by several times.The suction sand system of the present embodiment includes sand sucker group, water charging system, electric power system, sand water discharge spout road and mortar sedimentation basin.The step of the present embodiment two, also includes to pour water into pit shaft, and it is higher than level of ground water to keep water level in pit shaft, and wherein, in pit shaft, water level is not less than 0.5m with the water-head of level of ground water.
Thixotropic slurry in the present embodiment step 3 is made using bentonite, and is mixed with curing agent and retarder in manufacturing process.The correction operation of step 3 specifically includes following steps：When open caisson run-off the straight, using sandstone bag to the slower side loading of sinking, or aspirating the side when sand is inhaled so as to which frictional force reduces, and to accelerate the subsidence velocity of the side, inclines until correcting more；When open caisson position shifts, open caisson inclined in opposite directions is made, then correct inclining, so operate repeatedly for several times, until the position for inclining side well body is effectively corrected.
The present embodiment observes 6～8 hours in implementation steps four after open caisson sinks to designed elevation, if open caisson adds up deflection and is not more than 10mm, then carries out underwater concrete back cover.The present embodiment keeps water level in well to be not less than the outer water level of well in implementation steps four, selections of concrete pay the utmost attention to using with early strong, slow setting, impervious, water resistant separately, the concrete of the performance such as the slump is larger.Pouring underwater concrete, is carried out using tremie method or pumping method, and ensures that continuously poured in one is finished, while noting continuously adding concrete in pouring into pipe, concreting carries out tube drawing and should accomplish that average rate is pulled out slowly after finishing.When under water, bottom concrete reaches design code intensity, and when open caisson meets anti-floating requirement, can be from open caisson draining from inside to outside.After water in well is extracted out, should check whether bottom concrete has at percolating water, if any repairing in time, then the loose removing of concrete surface be flattened.
Above content is the further description that the present invention is made with reference to specific preferred embodiment, it is impossible to assert that the specific embodiment of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, the other embodiment that draws under without departing from technical scheme, should be included in protection scope of the present invention.
Claims (8)
1. large-scale well-sinking sinking construction method, it is characterised in that comprise the following steps：
Step one, pre-cast sink well, caisson wall is poured making shaping；
Step 2, well sinking, cut the earth in open caisson, so that open caisson is sink to below water level in advance, and inhale sand using sand system is inhaled；
It is heavy that step 3, open caisson are helped, using slush pump inject on the outside of the open caisson wall thixotropic slurry carry out helping heavy, and help heavy during open caisson is rectified a deviation；
Step 4, after open caisson sinks to designed elevation, carry out underwater concrete back cover.
2. large-scale well-sinking sinking construction method according to claim 1, it is characterised in that the step one specifically includes following steps：The first segment cutting shoe of open caisson, second section cutting shoe, Section of three cutting shoe, bottom girder, partition wall are poured shaping by several times.
3. large-scale well-sinking sinking construction method according to claim 1, it is characterised in that the suction sand system includes sand sucker group, water charging system, electric power system, sand water discharge spout road and mortar sedimentation basin.
4. large-scale well-sinking sinking construction method according to claim 1, it is characterised in that the step 2 also includes to pour water into pit shaft, it is higher than level of ground water to keep water level in pit shaft.
5. large-scale well-sinking sinking construction method according to claim 4, it is characterised in that water level is not less than 0.5m with the water-head of level of ground water in the pit shaft.
6. large-scale well-sinking sinking construction method according to claim 1, it is characterised in that the thixotropic slurry in the step 3 is made using bentonite, and is mixed with curing agent and retarder in manufacturing process.
7. large-scale well-sinking sinking construction method according to claim 1, it is characterised in that the correction operation of the step 3 specifically includes following steps：When open caisson run-off the straight, using sandstone bag to the slower side loading of sinking, or aspirating the side when sand is inhaled so as to which frictional force reduces, and to accelerate the subsidence velocity of the side, inclines until correcting more；When open caisson position shifts, open caisson inclined in opposite directions is made, then correct inclining, so operate repeatedly for several times, until the position for inclining side well body is effectively corrected.
8. the large-scale well-sinking sinking construction method according to any one in claim 1～7, it is characterised in that the step 4 observes 6～8 hours after open caisson sinks to designed elevation, if open caisson adds up deflection and is not more than 10mm, then carries out underwater concrete back cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510545152.4A CN106480897A (en) | 2015-08-31 | 2015-08-31 | Large-scale well-sinking sinking construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510545152.4A CN106480897A (en) | 2015-08-31 | 2015-08-31 | Large-scale well-sinking sinking construction method |
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| Publication Number | Publication Date |
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| CN106480897A true CN106480897A (en) | 2017-03-08 |
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| CN201510545152.4A Pending CN106480897A (en) | 2015-08-31 | 2015-08-31 | Large-scale well-sinking sinking construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106869129A (en) * | 2017-04-19 | 2017-06-20 | 郭坤 | A kind of mud replaces the construction method of open caisson |
| CN113756351A (en) * | 2021-09-23 | 2021-12-07 | 黄河建工集团有限公司 | Construction method for sinking of non-drainage open caisson |
-
2015
- 2015-08-31 CN CN201510545152.4A patent/CN106480897A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106869129A (en) * | 2017-04-19 | 2017-06-20 | 郭坤 | A kind of mud replaces the construction method of open caisson |
| CN113756351A (en) * | 2021-09-23 | 2021-12-07 | 黄河建工集团有限公司 | Construction method for sinking of non-drainage open caisson |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170308 |
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| WD01 | Invention patent application deemed withdrawn after publication |