CN105780792A - Well plugging method and well plugging structure of high water head relief dewatering well in foundation pit - Google Patents
Well plugging method and well plugging structure of high water head relief dewatering well in foundation pit Download PDFInfo
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- CN105780792A CN105780792A CN201610225014.2A CN201610225014A CN105780792A CN 105780792 A CN105780792 A CN 105780792A CN 201610225014 A CN201610225014 A CN 201610225014A CN 105780792 A CN105780792 A CN 105780792A
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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Abstract
The invention relates to a well plugging method and a well plugging structure of a high water head relief dewatering well in a foundation pit. The well plugging method comprises the following steps of firstly, simultaneously inserting drainage pipes and a lower water-stop steel ring plate into a design elevation position inside a well casing of the dewatering well; secondly, sequentially back filling clay balls and micro-expansion plain concrete upwards from the lower water-stop steel ring plate; thirdly, placing an upper water-stop steel ring plate at the top surface of the micro-expansion plain concrete, and performing full weld connection on the upper water-stop steel ring plate, a lower drainage steel tube, a plug and the well casing of the dewatering pipe; and finally, back filling the upper surface of the upper water-stop steel ring plate with same base plate grade concrete. According to the well plugging method and the well plugging structure disclosed by the invention, the problem that a plurality of dewatering wells cannot normally construct due to the action of confined water at last under the condition that high water head confined water in the foundation pit exists is effectively solved. The well plugging method and the well plugging structure disclosed by the invention have the advantages of simplicity, easiness in operation, high well plugging efficiency, good water stopping effect, safety, reliability, wide application range and the like, and can provide reference for well plugging construction of high water head relief dewatering wells in similar foundation pit engineering.
Description
Technical field
The present invention relates to a kind of Dewatering by pressure reduction well shut-in well method and shut-in well structure, be particularly suited for foundation ditch and there is the plugging dewatering well of high water head artesian water.
Background technology
Generally, the problem that base pit engineering relates to three aspects, including intensity, deformation and stability, stability problem is the importance that base pit engineering is very important, when base pit engineering exists high water head artesian water, check through theoretical calculation method, the anti-pressure-bearing Shuitu of foundation ditch gushes stability when being unsatisfactory for requiring, at this time, it may be necessary to arrange Dewatering by pressure reduction well in foundation ditch scope, the whole digging process of foundation ditch carries out on-demand pumping relief, it is ensured that the anti-pressure-bearing Shuitu at the bottom of Foundation Pit is gushed stability and met requirement.When excavation of foundation pit is the end of to, before building basement bottom board, it is necessary to the water pump in dewatering well and pump line are lifted up recovery, carry out dewatering well shut-in well construction.The shut-in well construction of early stage also has a number of dewatering well to be in running status due to surrounding, artesian water head can be controlled in below dewatering well backfill absolute altitude, can shunt in a well by normal construction technique, and the shut-in well construction in later stage is drawn water work owing to most dewatering wells have stopped decompression, cause that some mouthfuls of last dewatering wells are in the effect of high water head artesian water, it is impossible to shunt in a well by normal construction technique.It is therefore proposed that foundation ditch high water head Dewatering by pressure reduction well reliable, efficient shut-in well measure is the engineering roadblock currently needing solution badly.
Summary of the invention
Problem to be solved by this invention be to provide a kind of foundation ditch high water head Dewatering by pressure reduction well shut-in well method and shut-in well structure, this shut-in well method and shut-in well simple in construction easily operate, efficiency of shunting in a well height, stagnant water effect good, safe and reliable, applied widely.
The technical solution of the present invention is: a kind of foundation ditch high water head Dewatering by pressure reduction well shut-in well method, including drainage tube (top drain steel pipe, bottom drain steel pipe), water-stopping steel ring flat-plate (bottom water-stopping steel ring flat-plate, top water-stopping steel ring flat-plate), plug, clay ball, microdilatancy plain concrete, with base plate concrete；First bottom water-stopping steel ring flat-plate is connected with bottom drain steel pipe full weld, drain steel pipe in top is flexibly connected prepared drainage tube with bottom drain steel pipe by screw thread, and then drainage tube (side containing bottom water-stopping steel ring flat-plate) is inserted inside dewatering well well casing, down it is pressed into designed elevation position；Secondly by dewatering well well casing top to well casing internal backfill clay ball to designed elevation position, continuing to well casing internal backfill microdilatancy plain concrete to designed elevation position followed by dewatering well well casing top, whole backfilling process underground high water head artesian water continues through drainage tube and discharges；Then after treating microdilatancy plain concrete initial set, remove top drain steel pipe, run through plug and seal bottom drain steel pipe top, underground high water head artesian water is stoped to be emerged by bottom drain steel pipe, and then lay leak stopping king in top water-stopping steel ring flat-plate upper and lower surface, and put it into inside dewatering well well casing, the upper surface location place of microdilatancy plain concrete, by electric welding, top water-stopping steel ring flat-plate is connected with bottom drain steel pipe top, plug and dewatering well well casing full weld；Finally with same base plate concrete, dewatering well well casing is shut.
Described bottom water-stopping steel ring flat-plate is connected with bottom drain steel-pipe welding, and lower surface contacts with underground high water head artesian water, and upper surface contacts with clay ball；Bottom water-stopping steel ring flat-plate external diameter and dewatering well well casing equal diameters, internal diameter is equal with bottom drain outer diameter of steel pipes.
Described bottom drain steel pipe is all equal with top drain pipe diameter, external diameter and wall thickness, the two is flexibly connected by screw thread, bottom drain steel pipe is elongated, it is positioned at inside dewatering well well casing, drain steel duct in bottom is full of underground high water head artesian water, top drain steel pipe is L-shaped, and part is positioned at inside dewatering well well casing.
Described clay ball is positioned at the spatial dimension that bottom water-stopping steel ring flat-plate upper surface, microdilatancy plain concrete bottom surface, bottom drain outer surface of steel tube and dewatering well well casing inner surface are formed.
Described microdilatancy plain concrete is positioned at the spatial dimension that clay ball upper surface, top water-stopping steel ring flat-plate lower surface, bottom drain outer surface of steel tube and dewatering well well casing inner surface are formed.
Described top water-stopping steel ring flat-plate is connected with bottom drain steel pipe top, plug and dewatering well well casing inner surface full weld, upper surface with base plate concrete base contact, lower surface and microdilatancy plain concrete top contact.
Described top water-stopping steel ring flat-plate is all equal with bottom water-stopping steel ring flat-plate external diameter, internal diameter and thickness of slab.
Described plug is connected by thread seal with bottom drain steel pipe top.
The spatial dimension that described same base plate concrete is positioned at top water-stopping steel ring flat-plate and plug upper surface, dewatering well well casing end face and inner surface are formed.
Present invention also offers a kind of foundation ditch high water head Dewatering by pressure reduction well shut-in well structure, including the drainage tube stretched in dewatering well well casing and the water-stopping steel ring flat-plate being positioned at dewatering well well casing；Drainage tube is made up of top drain steel pipe and bottom drain steel pipe, and top drain steel pipe and bottom drain steel pipe are flexibly connected by screw thread；Water-stopping steel ring flat-plate includes bottom water-stopping steel ring flat-plate and top water-stopping steel ring flat-plate, and bottom water-stopping steel ring flat-plate is connected with drain steel pipe lower end, bottom by welding, and top water-stopping steel ring flat-plate is connected with drain steel pipe upper end, bottom by welding；Bottom drain steel pipe top is provided with plug, and plug is connected by thread seal with bottom drain steel pipe top；Clay layers of balls and concrete layer one it is sequentially provided with from the bottom up between bottom water-stopping steel ring flat-plate and top water-stopping steel ring flat-plate；Top seal ring steel plate is arranged over concrete layer two.
Top drain steel pipe and bottom drain pipe diameter, external diameter and wall thickness are all equal；Top drain steel pipe is L-shaped, and drain steel pipe one end, top is stretched into inside dewatering well well casing.
Bottom water-stopping steel ring flat-plate and top water-stopping steel ring flat-plate internal diameter, external diameter and thickness of slab are all equal；Top water-stopping steel ring flat-plate is also connected with plug and dewatering well well casing inwall full weld.
Described concrete layer one is microdilatancy plain concrete layer；Described concrete layer two is same base plate concrete layer.
Clay ball is positioned at the spatial dimension that bottom water-stopping steel ring flat-plate upper surface, concrete layer one bottom surface, bottom drain outer surface of steel tube and dewatering well well casing inner surface are formed；Concrete layer one is positioned at the spatial dimension that clay ball upper surface, top water-stopping steel ring flat-plate lower surface, bottom drain outer surface of steel tube and dewatering well well casing inner surface are formed；Concrete layer two is positioned at the spatial dimension that top water-stopping steel ring flat-plate upper surface, dewatering well well casing end face and inner surface are formed.
The invention has the beneficial effects as follows: by arranging drain steel pipe inside base pit dewatering well well casing, discharge for underground bearing water provides effective passage, drain steel pipe and water-stopping steel ring flat-plate can be pressed into smoothly to designed elevation position, and create condition with the backfill that water-stopping steel ring flat-plate is clay ball and microdilatancy plain concrete of drain steel-pipe welding in advance, and plug and bottom drain steel pipe top are threaded connection, comprcssive strength is high, it is effective against the effect of underground bearing water, the dual sealing barrier that second water-stopping steel ring flat-plate and first water-stopping steel ring flat-plate are formed, can effectively stop groundwater seepage, finally with same base plate concrete, dewatering well well casing is shut, further increase the shut-in well quality of dewatering well, guarantee to cut off completely underground bearing water.
The present invention has the advantages such as simple to operation, shut-in well efficiency is high, stagnant water effect is good, safe and reliable, applied widely, can be that the shut-in well construction of similar base pit engineering high water head Dewatering by pressure reduction well is offered reference.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the A-A generalized section of the present invention.
Fig. 3 is the B-B generalized section of the present invention.
Fig. 4 is the C-C generalized section of the present invention.
Fig. 5 is the D-D generalized section of the present invention.
Fig. 6 is the E-E generalized section of the present invention.
Fig. 7 is the F-F generalized section of the present invention.
Fig. 8 is the G-G generalized section of the present invention.
Detailed description of the invention
Referring to Fig. 1-8, the present invention includes drainage tube 1.1,1.2(top drain steel pipe 1.1, bottom drain steel pipe 1.2), water-stopping steel ring flat-plate 2.1,2.2(bottom water-stopping steel ring flat-plate 2.1, top water-stopping steel ring flat-plate 2.2), plug 3, clay ball 4, microdilatancy plain concrete 5, with base plate concrete 6.
The enforcement step of the present invention is: be first that water pump and pump line are lifted up recovery；Secondly bottom water-stopping steel ring flat-plate 2.1 is connected with bottom drain steel pipe 1.2 full weld, top drain steel pipe 1.1 is flexibly connected by screw thread with bottom drain steel pipe 1.2, and then by drainage tube 1.1, the side that 1.2(contains bottom water-stopping steel ring flat-plate 2.1) insert dewatering well well casing 7 inside, down it is pressed into designed elevation position, now, owing to subsoil water has pressure-bearing property, underground high water head artesian water 8 will by drainage tube 1.1, 1.2 discharge, draining is drainage tube 1.1, 1.2 press-ins create condition, make drainage tube 1.1, 1.2 can arrive designed elevation position smoothly, now need the work that intercepts water carried out outside dewatering well well casing 7, prevent the subsoil water discharged from pouring in down a chimney in dewatering well, the shut-in well hindering follow-up dewatering well is constructed；nullThen pass through dewatering well well casing top to well casing internal backfill clay ball 4 to designed elevation position，Continue to well casing internal backfill microdilatancy plain concrete 5 to designed elevation position followed by dewatering well well casing top，Whole backfilling process underground high water head artesian water 8 continues through drainage tube 1.1、1.2 discharge，After treating microdilatancy plain concrete initial set，Remove top drain steel pipe 1.1，Run through plug 3 and seal bottom drain steel pipe 1.2 top，Underground high water head artesian water 8 is stoped to be emerged by bottom drain steel pipe 1.2，And then lay leak stopping king in top water-stopping steel ring flat-plate 2.2 upper and lower surface，Put into inside dewatering well well casing、The upper surface location place of microdilatancy plain concrete 5，By electric welding by top water-stopping steel ring flat-plate 2.2 and bottom drain steel pipe 1.2 top、Plug 3 and dewatering well well casing 7 full weld connect；Finally being shut by dewatering well well casing with same base plate concrete 6, so far, the shut-in well construction of dewatering well is fully completed.
The invention have the advantages that
(1) simple to operation: this Dewatering by pressure reduction well shut-in well method and the used material of structure and component simple, clay ball, microdilatancy plain concrete, water-stopping steel ring flat-plate and drain steel pipe etc. are the conventional material of architectural engineering and component, this shut-in well method and structure are without complicated assembling and special construction machinery simultaneously, construct very easy.
(2) shut-in well efficiency is high: this Dewatering by pressure reduction well shut-in well method and structure construction procedure connection are reasonable, can complete shut-in well construction in the shorter time, and not by the impact of adjacent Dewatering by pressure reduction well shut-in well construction, ultrahigh in efficiency of shunting in a well.
(3) stagnant water effect is good, safe and reliable: this Dewatering by pressure reduction well shut-in well method and structure are provided with double-deck water-stopping steel ring flat-plate, and be furnished with clay ball and microdilatancy plain concrete and with the concrete composition one of label, there is globality, safe and reliable water sealing structure with base plate, form multiple sealing barrier, it is ensured that cut off underground bearing water completely.
(4) applied widely: for the shut-in well construction of the Dewatering by pressure reduction well that foundation ditch is arranged, no matter artesian water head height is all applicable, to be particularly suited for the shut-in well construction of last some mouthfuls of high water head Dewatering by pressure reduction wells.
Claims (9)
1. a foundation ditch high water head Dewatering by pressure reduction well shut-in well method, first bottom water-stopping steel ring flat-plate is connected with bottom drain steel pipe full weld, drain steel pipe in top is flexibly connected prepared drainage tube with bottom drain steel pipe by screw thread, and then drainage tube is inserted inside dewatering well well casing, down it is pressed into designed elevation position；Secondly by dewatering well well casing top to well casing internal backfill clay ball to designed elevation position, continuing to well casing internal backfill microdilatancy plain concrete to designed elevation position followed by dewatering well well casing top, whole backfilling process underground high water head artesian water continues through drainage tube and discharges；Then after treating microdilatancy plain concrete initial set, remove top drain steel pipe, run through plug and seal bottom drain steel pipe top, stop underground high water head artesian water to be emerged by bottom drain steel pipe；Then leak stopping king is laid in top water-stopping steel ring flat-plate upper and lower surface, and the top water-stopping steel ring flat-plate laying leak stopping king is put into inside dewatering well well casing and is positioned at the upper surface location place of microdilatancy plain concrete, by electric welding, top water-stopping steel ring flat-plate is connected with bottom drain steel pipe top, plug and dewatering well well casing full weld；Finally with same base plate concrete, dewatering well well casing is shut.
2. foundation ditch high water head Dewatering by pressure reduction well shut-in well method as claimed in claim 1, it is characterised in that: top drain steel pipe and bottom drain pipe diameter, external diameter and wall thickness are all equal；Top drain steel pipe is L-shaped, and partial-length scope is positioned at inside dewatering well well casing；Bottom drain steel pipe is elongated, and length range is positioned at inside dewatering well well casing.
3. foundation ditch high water head Dewatering by pressure reduction well shut-in well method as claimed in claim 1, it is characterised in that: bottom water-stopping steel ring flat-plate and top water-stopping steel ring flat-plate internal diameter, external diameter and thickness of slab are all equal；Top water-stopping steel ring flat-plate is also connected with plug and dewatering well well casing inwall full weld.
4. foundation ditch high water head Dewatering by pressure reduction well shut-in well method as claimed in claim 1, it is characterised in that: clay ball is positioned at the spatial dimension that bottom water-stopping steel ring flat-plate upper surface, microdilatancy plain concrete bottom surface, bottom drain outer surface of steel tube and dewatering well well casing inner surface are formed；Microdilatancy plain concrete is positioned at the spatial dimension that clay ball upper surface, top water-stopping steel ring flat-plate lower surface, bottom drain outer surface of steel tube and dewatering well well casing inner surface are formed；It is positioned at top water-stopping steel ring flat-plate and spatial dimension that plug upper surface, dewatering well well casing end face and inner surface are formed with base plate concrete.
5. a foundation ditch high water head Dewatering by pressure reduction well shut-in well structure, it is characterised in that: include the drainage tube stretching in dewatering well well casing and the water-stopping steel ring flat-plate being positioned at dewatering well well casing；Drainage tube is made up of top drain steel pipe and bottom drain steel pipe, and top drain steel pipe and bottom drain steel pipe are flexibly connected by screw thread；Water-stopping steel ring flat-plate includes bottom water-stopping steel ring flat-plate and top water-stopping steel ring flat-plate, and bottom water-stopping steel ring flat-plate is connected with drain steel pipe lower end, bottom by welding, and top water-stopping steel ring flat-plate is connected with drain steel pipe upper end, bottom by welding；Bottom drain steel pipe top is provided with plug, and plug is connected by thread seal with bottom drain steel pipe top；Clay layers of balls and concrete layer one it is sequentially provided with from the bottom up between bottom water-stopping steel ring flat-plate and top water-stopping steel ring flat-plate；Top seal ring steel plate is arranged over concrete layer two.
6. foundation ditch high water head Dewatering by pressure reduction well shut-in well structure as claimed in claim 5, it is characterised in that: top drain steel pipe and bottom drain pipe diameter, external diameter and wall thickness are all equal；Top drain steel pipe is L-shaped, and drain steel pipe one end, top is stretched into inside dewatering well well casing.
7. foundation ditch high water head Dewatering by pressure reduction well shut-in well structure as claimed in claim 5, it is characterised in that: bottom water-stopping steel ring flat-plate and top water-stopping steel ring flat-plate internal diameter, external diameter and thickness of slab are all equal；Top water-stopping steel ring flat-plate is also connected with plug and dewatering well well casing inwall full weld.
8. foundation ditch high water head Dewatering by pressure reduction well shut-in well structure as claimed in claim 5, it is characterised in that: described concrete layer one is microdilatancy plain concrete layer；Described concrete layer two is same base plate concrete layer.
9. foundation ditch high water head Dewatering by pressure reduction well shut-in well structure as claimed in claim 5, it is characterised in that: clay ball is positioned at the spatial dimension that bottom water-stopping steel ring flat-plate upper surface, concrete layer one bottom surface, bottom drain outer surface of steel tube and dewatering well well casing inner surface are formed；Concrete layer one is positioned at the spatial dimension that clay ball upper surface, top water-stopping steel ring flat-plate lower surface, bottom drain outer surface of steel tube and dewatering well well casing inner surface are formed；Concrete layer two is positioned at the spatial dimension that top water-stopping steel ring flat-plate upper surface, dewatering well well casing end face and inner surface are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610225014.2A CN105780792B (en) | 2016-04-12 | 2016-04-12 | A kind of foundation pit high water head Dewatering by pressure reduction well shut-in well method and structure of shunting in a well |
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| CN201610225014.2A CN105780792B (en) | 2016-04-12 | 2016-04-12 | A kind of foundation pit high water head Dewatering by pressure reduction well shut-in well method and structure of shunting in a well |
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| CN105780792A true CN105780792A (en) | 2016-07-20 |
| CN105780792B CN105780792B (en) | 2018-11-02 |
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| CN108930279A (en) * | 2017-05-27 | 2018-12-04 | 中国二十冶集团有限公司 | Deep foundation pit precipitation pipe well excavates rear enclosed method |
| CN110359472A (en) * | 2019-06-19 | 2019-10-22 | 五冶集团上海有限公司 | A kind of base pit dewatering well plugging device and its application method |
| CN111305245A (en) * | 2019-12-05 | 2020-06-19 | 中冶天工集团有限公司 | Confined water dewatering well sealing device and construction method |
| CN114703878A (en) * | 2022-05-07 | 2022-07-05 | 中建八局第二建设有限公司 | Plugging and draining device for dewatering well and construction method |
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| CN101294393A (en) * | 2007-04-29 | 2008-10-29 | 上海市第七建筑有限公司 | Construction method with dewatering water well equipped outside of foundation pit |
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| CN111305245A (en) * | 2019-12-05 | 2020-06-19 | 中冶天工集团有限公司 | Confined water dewatering well sealing device and construction method |
| CN114703878A (en) * | 2022-05-07 | 2022-07-05 | 中建八局第二建设有限公司 | Plugging and draining device for dewatering well and construction method |
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| Publication number | Publication date |
|---|---|
| CN105780792B (en) | 2018-11-02 |
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