CN107313437A - The shut-in well construction method of foundation ditch pressure-bearing dewatering well - Google Patents
The shut-in well construction method of foundation ditch pressure-bearing dewatering well Download PDFInfo
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- CN107313437A CN107313437A CN201610267544.3A CN201610267544A CN107313437A CN 107313437 A CN107313437 A CN 107313437A CN 201610267544 A CN201610267544 A CN 201610267544A CN 107313437 A CN107313437 A CN 107313437A
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- Prior art keywords
- well
- pressure
- bearing
- foundation ditch
- construction
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Classifications
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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
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The present invention relates to foundation pit construction field, specifically a kind of shut-in well construction method of foundation ditch pressure-bearing dewatering well；It is characterized in that：Including before the construction of foundation ditch concrete floor and on the premise of Dewatering requirement is met, using compaction grouting, backfilling part pressure-bearing dewatering well in the method closing hole of clay；When foundation ditch concrete floor is constructed, steel plate for sealing water is welded to the pressure-bearing dewatering well periphery not yet closed in hole；After the construction of foundation ditch concrete floor terminates, whole pressure-bearing dewatering wells in hole are closed by the way of compaction grouting in well, and lay around artesian well steel plate for sealing water；The outer fill concrete of well is with closed bottom breach；Step 4, the outer pressure-bearing dewatering well in closing hole：First backfilled during closing below clay to well head at 1.5m, after into well, disturbing concrete is to well head again after clay sinking, finally with steel plate full weld to close well head.This method is applicable not only to the shut-in well construction of foundation ditch pressure-bearing dewatering well, applies also for the shut-in well construction of other pressure-bearing dewatering wells；Compared with existing pressure-bearing dewatering well shut-in well construction method at present, this method has easy construction, influences the features such as small, sealing effect is good to foundation ditch concrete floor integrality.
Description
Technical field
The present invention relates to foundation pit construction field, specifically a kind of shut-in well construction method of foundation ditch pressure-bearing dewatering well.
Background technology
The purpose of base pit engineering is to build（Structure）The underground structure for building thing provides certain, safety, the rational underground space.The requirement continued to develop to base pit engineering of the underground space is more and more, and the requirement that base pit engineering need to meet underground engineering is also more and more.Wherein, dry construction space is the important guarantee condition of base pit engineering smooth construction.Most underground Structural Engineering requirements are dry anhydrous in being cheated in construction period.Therefore, the construction of base pit engineering must assure that foundation ditch is dry during excavating and when delivery owner of being completed uses, i.e., do not have large area ponding in hole, meet structure construction demand.
Precipitation is that foundation ditch ensures to dry anhydrous major measure in hole in construction period.China southeastern coastal areas, underground water contains abundant, and artesian aquifer is buried below certain depth.With the intensification of excavation of foundation pit depth, there is the risk punctured by artesian water in pit bottom soil layer.Therefore, it is necessary to effectively below reduction foundation ditch artesian aquifer artesian head, it is ensured that the safety that pit earthwork is excavated, and then reduce the moisture content of excavation of foundation pit soil layer, reduce influence of the excavation of foundation pit to surrounding enviroment, it is ensured that foundation pit construction is smoothed out.
It is to reduce the effective measures of artesian aquifer head below foundation ditch in the inside and outside a number of pressure-bearing dewatering well of setting of foundation ditch.Artesian water head be higher than foundation ditch concrete bottom plate face absolute altitude in the case of, it is ensured that hole in artesian well close be successfully subsequent construction important leverage.
The content of the invention
It is an object of the invention to overcome the shortcomings of existing pressure-bearing dewatering well shut-in well construction method, a kind of shut-in well construction method of foundation ditch pressure-bearing dewatering well is being provided.
In order to achieve the above object, the present invention is realized in：
A kind of shut-in well construction method of foundation ditch pressure-bearing dewatering well, including
Step 1, before the construction of foundation ditch concrete floor and on the premise of Dewatering requirement is met, using compaction grouting, part pressure-bearing dewatering well in the method closing hole of clay is backfilled；
Step 2, when foundation ditch concrete floor is constructed, steel plate for sealing water is welded to the pressure-bearing dewatering well periphery not yet closed in hole；
Step 3, after the construction of foundation ditch concrete floor terminates, whole pressure-bearing dewatering wells in hole are closed by the way of compaction grouting in well, and lay around artesian well steel plate for sealing water；The outer fill concrete of well is with closed bottom breach；
Step 4, the outer pressure-bearing dewatering well in closing hole：First backfilled during closing below clay to well head at 1.5m, after into well, disturbing concrete is to well head again after clay sinking, finally with steel plate full weld to close well head.
The step of shut-in well construction method of described foundation ditch pressure-bearing dewatering well, shut-in well, includes：
Step 1, holding pressure-bearing precipitation Well Water Level remain static, and pressure-bearing dewatering well are filled using tonerde, packed height should be higher by 2m ~ 3m than chimney filter；Treat that clay precipitates stabilization completely, pulled water out with water pump, pressure-bearing water penetration situation is measured with water-level gauge；
Step 2, using clay ball pressure-bearing dewatering well is filled, packed height about 2m, pressure-bearing water penetration situation is detected with water-level gauge；
Step 3, the mix for inserting to pressure-bearing dewatering well melon seeds piece and sand, the backfill height of sandstone mix should be in base plate of foundation pit above 2m；
Step 4, Grouting Pipe and well head are fixed with reinforcing bar after start slip casting, cement mortar is penetrated into well casing gap by the space of melon seeds piece；
Step 5, reach cement mortar presetting period after, cut off 0.5m below well casing to base surface；
Step 6, observation 2h ~ 4h, if there is a small amount of water to overflow in well casing, quick hardening cement can be used to close well casing；If anhydrous in well casing overflow, and sealing effect meets and required, welding steel closing well head；
Assembling reinforcement progress second coagulation soil is poured after the completion of step 7, the foundation ditch concrete floor periphery dabbing that will be reserved at pressure-bearing dewatering well, garbage-cleaning.
The shut-in well construction method of described foundation ditch pressure-bearing dewatering well, grouting pressure is 0.4MPa ~ 0.6MPa, and grouting amount is not less than 220L/min.
This method is applicable not only to the shut-in well construction of foundation ditch pressure-bearing dewatering well, applies also for the shut-in well construction of other pressure-bearing dewatering wells；Compared with existing pressure-bearing dewatering well shut-in well construction method at present, this method has easy construction, influences the features such as small, sealing effect is good to foundation ditch concrete floor integrality.
Embodiment
The present invention is further illustrated below by way of specific embodiment.
Step 1, before the construction of foundation ditch concrete floor, part pressure-bearing dewatering well in closing hole：The purpose of the step is to improve foundation ditch concrete floor integrality, must carried out on the premise of Dewatering requirement is met；It after these pressure-bearing dewatering wells are stopped, must immediately take out, be closed using the method for compaction grouting, backfill clay；
Step 2, when foundation ditch concrete floor is constructed, steel plate for sealing water is welded to the pressure-bearing dewatering well periphery not yet closed in hole：The step can provide facility from closing of the structural point for later pressure-bearing dewatering well；
Step 3, after the construction of foundation ditch concrete floor terminates, whole pressure-bearing dewatering wells in closing hole：Closing is carried out by the way of compaction grouting in well, and lays around artesian well steel plate for sealing water；The outer fill concrete of well is with closed bottom breach；
Step 4, the outer pressure-bearing dewatering well in closing hole：First backfilled during closing below clay to well head at 1.5m, after into well, disturbing concrete is to well head again after clay sinking, finally with steel plate full weld to close well head.
In above-mentioned steps, shunt in a well according to following flow：
（1）Keep pressure-bearing precipitation Well Water Level to remain static, pressure-bearing dewatering well is filled using tonerde, packed height should be higher by 2m ~ 3m than chimney filter；Treat that clay precipitates stabilization completely, pulled water out with water pump, pressure-bearing water penetration situation is measured with water-level gauge；
（2）Pressure-bearing dewatering well is filled using clay ball, packed height about 2m, pressure-bearing water penetration situation is detected with water-level gauge；
（3）The mix of melon seeds piece and sand is inserted to pressure-bearing dewatering well, the backfill height of sandstone mix should be in base plate of foundation pit above 2m；
（4）Start slip casting after being fixed Grouting Pipe and well head with reinforcing bar, cement mortar is penetrated into well casing gap by the space of melon seeds piece；
（5）After the presetting period for reaching cement mortar, 0.5m below well casing to base surface is cut off；
（6）2h ~ 4h is observed, if there is a small amount of water to overflow in well casing, quick hardening cement can be used to close well casing；If anhydrous in well casing overflow, and sealing effect meets and required, welding steel closing well head；
（7）Assembling reinforcement progress second coagulation soil is poured after the completion of the foundation ditch concrete floor periphery dabbing that will be reserved at pressure-bearing dewatering well, garbage-cleaning.
Preferably, grouting pressure is 0.4MPa ~ 0.6MPa.
Preferably, grouting amount is not less than 220L/min.
When carrying out aforesaid operations, it shall be noted that：
（1）According to construction condition, before the cast of foundation ditch concrete floor, using the shut-in well method of densification clay, compaction grouting, on the premise of base pit dewatering effect is ensured, part pressure-bearing dewatering well in closing hole is as often as possible closed to the pressure-bearing dewatering well in hole.
（2）During construction foundation pit concrete floor, while the pressure-bearing dewatering well normal work for keeping not yet closing in hole, steel plate for sealing water is welded on its periphery, is that the closing of pressure-bearing dewatering well in being cheated after the completion of foundation ditch concrete floor is constructed creates favorable conditions.
（3）Foundation ditch concrete floor is completed after construction, the pressure-bearing dewatering well not yet closed in hole is closed by the way of compaction grouting in well, while laying steel plate for sealing water around artesian well.In the outside fill concrete of pressure-bearing dewatering well, closed with the breach to foundation ditch concrete floor.
（4）The pressure-bearing dewatering well outside foundation ditch is closed, and well head is closed with steel plate full weld.
Claims (3)
1. a kind of shut-in well construction method of foundation ditch pressure-bearing dewatering well, it is characterized in that：Including
Step 1, before the construction of foundation ditch concrete floor and on the premise of Dewatering requirement is met, using compaction grouting, part pressure-bearing dewatering well in the method closing hole of clay is backfilled；
Step 2, when foundation ditch concrete floor is constructed, steel plate for sealing water is welded to the pressure-bearing dewatering well periphery not yet closed in hole；
Step 3, after the construction of foundation ditch concrete floor terminates, whole pressure-bearing dewatering wells in hole are closed by the way of compaction grouting in well, and lay around artesian well steel plate for sealing water；The outer fill concrete of well is with closed bottom breach；
Step 4, the outer pressure-bearing dewatering well in closing hole：First backfilled during closing below clay to well head at 1.5m, after into well, disturbing concrete is to well head again after clay sinking, finally with steel plate full weld to close well head.
2. the shut-in well construction method of foundation ditch pressure-bearing dewatering well according to claim 1, it is characterized in that：The step of being shunt in a well described in claim 1 includes：
Step 1, holding pressure-bearing precipitation Well Water Level remain static, and pressure-bearing dewatering well are filled using tonerde, packed height should be higher by 2m ~ 3m than chimney filter；Treat that clay precipitates stabilization completely, pulled water out with water pump, pressure-bearing water penetration situation is measured with water-level gauge；
Step 2, using clay ball pressure-bearing dewatering well is filled, packed height about 2m, pressure-bearing water penetration situation is detected with water-level gauge；
Step 3, the mix for inserting to pressure-bearing dewatering well melon seeds piece and sand, the backfill height of sandstone mix should be in base plate of foundation pit above 2m；
Step 4, Grouting Pipe and well head are fixed with reinforcing bar after start slip casting, cement mortar is penetrated into well casing gap by the space of melon seeds piece；
Step 5, reach cement mortar presetting period after, cut off 0.5m below well casing to base surface；
Step 6, observation 2h ~ 4h, if there is a small amount of water to overflow in well casing, quick hardening cement can be used to close well casing；If anhydrous in well casing overflow, and sealing effect meets and required, welding steel closing well head；
Assembling reinforcement progress second coagulation soil is poured after the completion of step 7, the foundation ditch concrete floor periphery dabbing that will be reserved at pressure-bearing dewatering well, garbage-cleaning.
3. the shut-in well construction method of foundation ditch pressure-bearing dewatering well according to claim 1, it is characterized in that：Grouting pressure is 0.4MPa ~ 0.6MPa, and grouting amount is not less than 220L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610267544.3A CN107313437A (en) | 2016-04-27 | 2016-04-27 | The shut-in well construction method of foundation ditch pressure-bearing dewatering well |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610267544.3A CN107313437A (en) | 2016-04-27 | 2016-04-27 | The shut-in well construction method of foundation ditch pressure-bearing dewatering well |
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| CN107313437A true CN107313437A (en) | 2017-11-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240011A (en) * | 2017-12-28 | 2018-07-03 | 中化地质矿山总局山东地质勘查院 | Construction method of high-pressure recharging well |
| CN108661058A (en) * | 2018-05-17 | 2018-10-16 | 张国良 | A kind of well burying method |
| CN113356249A (en) * | 2021-05-18 | 2021-09-07 | 中铁十六局集团第一工程有限公司 | Dewatering well sealing device and dewatering well sealing method |
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| CN101148884A (en) * | 2007-10-30 | 2008-03-26 | 山东天齐置业集团股份有限公司 | Waterproof and plugging construction method for precipitation well in foundation pit |
| CN103526766A (en) * | 2013-10-12 | 2014-01-22 | 中建八局第三建设有限公司 | Method for plugging relief well of deep foundation pit |
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| CN101148884A (en) * | 2007-10-30 | 2008-03-26 | 山东天齐置业集团股份有限公司 | Waterproof and plugging construction method for precipitation well in foundation pit |
| CN103835302A (en) * | 2012-11-27 | 2014-06-04 | 中国二十冶集团有限公司 | Deep foundation pit dewatering tube well shut-in construction method for superficial layer confined water soil layer |
| CN104420484A (en) * | 2013-08-22 | 2015-03-18 | 中国二十冶集团有限公司 | Deep foundation pit soil reinforcing area confined water well protecting method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240011A (en) * | 2017-12-28 | 2018-07-03 | 中化地质矿山总局山东地质勘查院 | Construction method of high-pressure recharging well |
| CN108661058A (en) * | 2018-05-17 | 2018-10-16 | 张国良 | A kind of well burying method |
| CN108661058B (en) * | 2018-05-17 | 2021-05-07 | 张国良 | Water well landfill method |
| CN113356249A (en) * | 2021-05-18 | 2021-09-07 | 中铁十六局集团第一工程有限公司 | Dewatering well sealing device and dewatering well sealing method |
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Application publication date: 20171103 |