CN104674827A - Novel totally-closed water stopping system for water-rich stratum foundation pit and construction method of novel totally-closed water stopping system - Google Patents
Novel totally-closed water stopping system for water-rich stratum foundation pit and construction method of novel totally-closed water stopping system Download PDFInfo
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Abstract
The invention belongs to the technical field of constructional engineering, and particularly relates to a novel totally-closed water stopping system for a water-rich stratum foundation pit and a construction method of the novel totally-closed water stopping system. According to a totally-closed water stopping technique, a suspended water-stopping curtain is adopted as the lateral wall of the foundation pit; a horizontally sealed artificial water-resisting layer is adopted as the bottom of the foundation pit; the totally-closed water stopping system is formed by the suspended water-stopping curtain on the lateral wall and the horizontally sealed artificial water-resisting layer; no hydraulic connection is formed between the underground water within the range of the foundation pit and the underground water out of the pit; and the underground water in the foundation pit becomes static water. A totally-closed foundation pit with an excellent structure is provided by reasonably setting various construction parameters and various structure parameters; the construction method is simple; shortage of underground water resources due to the fact that the underground water resources are destroyed by a large amount of rainfall inside and outside the foundation pit when no a water-resisting layer foundation pit is constructed at the bottom of the foundation pit in a water-rich area at present is solved; the underwater resources are protected; and the novel totally-closed water stopping system has relatively important significance in spring water protection of the spring city.
Description
Technical field
The invention belongs to the technical field of construction work, be specifically related to the novel closed cutting off water system of a kind of water rich strata foundation ditch and construction method.
Background technology
Traditional region of FuShui deep foundation pit precipitation generally adopts foundation pit side-wall to arrange water-stop curtain, water-stopping structure is combined with supporting and protection structure, water-stop curtain and substrate water barrier form closed water proof system, now within the scope of foundation ditch underground water with hole outer underground water without hydraulic connection, become Static Water, as long as extract the underground water of more than the following certain depth in the end, hole as required, and then carry out cheating interior precipitation, ensure that base pit engineering safety.But, extensively distribute at Jinan Spring Region karst crevice water, substrate Karst corridor is complicated and water barrier is thinner sometimes, substrate water proof weak effect, traditional water-stop curtain does not have due effect, in this case foundation pit construction usually adopts in suspension type water-stop curtain+hole and cheats the method for outer precipitation simultaneously, the water conservancy gradient formed meets the requirement of groundwater table lower than the end, hole, but this construction method needs continuously groundwater abstraction in work progress, huge waste is caused to groundwater resources, huge hidden danger is brought to the protection of Jinan Area spring, therefore, above-mentioned two kinds of conventional Method on Dewatering of Foundation Pits all have drawback in Jinan Area.
Summary of the invention
For the deficiency of above-mentioned construction method; the object of the present invention is to provide the novel closed cutting off water system of a kind of Jinan Area water rich strata foundation ditch and construction method; be specially the construction method of precipitation in artificial water barrier Horizontal seals+Foundation Pit bottom foundation pit side-wall suspension type water-stop curtain+foundation ditch; under this construction method; manufacture artificial horizontal water barrier back cover bottom foundation ditch; closed cutting off water system is formed with vertical water-stop curtain; avoid the outer precipitation in hole; decrease the waste of water resource, have prior meaning to the spring protection in spring city especially.
the technical solution used in the present invention is as follows:
The novel closed cutting off water system of a kind of water rich strata foundation ditch, comprise artificial water barrier Horizontal seals bottom foundation pit side-wall suspension type water-stop curtain and foundation ditch, bottom described foundation pit side-wall suspension type water-stop curtain and described foundation ditch, artificial water barrier Horizontal seals forms closed cutting off water system; Described foundation pit side-wall suspension type water-stop curtain is got to bottom foundation ditch following without the need to arriving natural water barrier; Bottom described foundation ditch, artificial water barrier Horizontal seals is artificial horizontal water barrier bottom the foundation ditch that adopts high-pressure rotary jet grouting pile to expand within the scope of foundation ditch to form sealing behind the end, and described high-pressure rotary jet grouting pile expands end ability Reasonable Arrangement within the scope of foundation ditch according to it.
Carry out precipitation in foundation ditch after closed cutting off water system completes, meet after foundation ditch water level inside requires and carry out excavation of foundation pit.
The feature of the novel closed cutting off water system of water rich strata foundation ditch of the present invention also has:
The stake composition of described foundation pit side-wall suspension type water-stop curtain employing 600-800mm or employing thickness are the diaphragm wall composition of 600-800mm.
Described foundation pit side-wall suspension type water-stop curtain gets to the following 500-800mm degree of depth bottom foundation ditch, does not arrive natural water barrier.
Bottom described foundation ditch, the thickness of artificial water barrier Horizontal seals adopts 500-800mm thickness to be good, forms good Horizontal seals layer.
Sphere of action at the bottom of the expansion of described high-pressure rotary jet grouting pile is diameter 2-3m.
Described foundation pit side-wall suspension type water-stop curtain adopts diaphragm wall, fender post+waterproof between piles, high-pressure rotary jet grouting pile or three axes agitating pile construction to obtain.
the present invention also provides the construction method of the novel closed cutting off water system of a kind of water rich strata foundation ditch, and step is as follows:
Step (1), carry out foundation pit side-wall suspension type water-stop curtain according to designing requirement construction layout after excavate guide groove;
Step (2), configuration cement paste, mixer rear mixing-filling in place, completes the construction of described foundation pit side-wall suspension type water-stop curtain;
Step (3), employing high-pressure rotary jet grouting pile expand artificial water barrier Horizontal seals bottom end formation foundation ditch bottom foundation ditch, according to ability hole arranged position within the scope of foundation ditch at the bottom of the expansion of described high-pressure rotary jet grouting pile, and driller insertion;
Step (4), carry out described high-pressure rotary jet grouting pile and expand bottom application work, namely through preparing cement paste, after sleeve pipe drilling rod to the following degree of depth of substrate transferred by startup rig, inject high pressure water and air destroys the foundation soil organizational styucture below bottom foundation ditch, then inject high pressure cement grout and air, progressively promote afterwards and spray cement injection, spray after rising to foundation ditch elevation of bottom and terminate, lift lug pipe bit bar completes the working procedure of a high-pressure rotary jet grouting pile, the inner all Construction of High Pressure Jet Grouting Pile operations of foundation ditch are completed after telephone-moving is in place, after high-pressure rotary jet grouting pile expands the end, substrate is covered completely and form artificial water barrier Horizontal seals bottom foundation ditch, for guaranteeing the totally-enclosed of substrate, need after Construction of High Pressure Jet Grouting Pile completes to carry out supplementary slip casting,
After bottom step (5), described foundation pit side-wall suspension type water-stop curtain and described foundation ditch, artificial water barrier Horizontal seals forms closed cutting off water system, carry out cheating interior precipitation within the scope of foundation ditch;
Step (6), excavation pit.
It is that the kinetic energy utilizing super-pressure churning body to have destroys foundation soil organizational styucture following bottom foundation ditch with grouting behind shaft or drift lining that described high-pressure rotary jet grouting pile expands end construction, mix and blend these destroyed grogs and hardened materials, form bigbore substrate modified body, each expansion after end modified body overlaps forms one deck level artificial water barrier as water barrier Horizontal seals artificial bottom foundation ditch.
Described foundation pit side-wall suspension type water-stop curtain generally adopts diaphragm wall, fender post+waterproof between piles, high-pressure rotary jet grouting pile or three axes agitating pile construction to construct, and gets to following bottom foundation ditch but do not need natural water barrier by described foundation pit side-wall suspension type water-stop curtain by water-stopping structure.
beneficial effect of the present invention is as follows:
The present invention is directed to water rich strata and provide a kind of closed cutting off water system and construction method, this totally-enclosed foundation ditch water-stop technology, foundation pit side-wall adopts suspension type water-stop curtain, the artificial water barrier of Horizontal seals is adopted bottom foundation ditch, described sidewall suspension type water-stop curtain and the artificial water barrier of described Horizontal seals define closed cutting off water system, within the scope of foundation ditch, underground water and the outer underground water in hole are without hydraulic connection, become Static Water, and by reasonably arranging each construction parameter and each structural parameters, provide the totally-enclosed foundation ditch that a kind of structure is excellent, and construction method is simple, solve existing when there is no a water barrier foundation pit construction bottom region of FuShui foundation ditch inside and outside foundation ditch a large amount of precipitation destroy the deficiency of groundwater resources, protect groundwater resources, prior meaning is had to the spring protection in spring city.
Accompanying drawing explanation
Fig. 1 is foundation pit side-wall suspension type water-stop curtain and foundation ditch inner high voltage rotary churning pile layout plan;
Fig. 2 is excavation of foundation pit front side wall suspension type water-stop curtain and hole inner high voltage rotary churning pile sectional drawing;
Fig. 3 is that foundation ditch defines the rear sectional drawing of closed water-stopping structure excavation;
In figure: 1-foundation pit side-wall suspension type water-stop curtain; 2-high-pressure rotary jet grouting pile expands end modified body; 3-foundation pit supporting construction; 4-high-pressure rotary-spray pipe casing; 5-groundwater table; 6-foundation ditch bottom surface absolute altitude; Artificial water barrier Horizontal seals bottom 7-foundation ditch; Groundwater table after precipitation in 8-foundation ditch.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail.
As shown in Figure 1, Figure 2, Figure 3 shows; this foundation ditch is Jinan Spring Region area foundation ditch; groundwater table 5 is higher; foundation ditch bottom surface absolute altitude 6 is positioned at below groundwater table; according to advance works geological mapping, without water barrier below substrate, therefore from protection spring and security of foundation ditch construction angle; the pattern foundation pit supporting structure precipitation scheme determined adopts foundation pit side-wall suspension type water-stop curtain 1, and the scheme that the end arranges artificial water barrier Horizontal seals 7 bottom foundation ditch is expanded by high-pressure rotary jet grouting pile in the end, hole.
The novel closed cutting off water system of a kind of water rich strata foundation ditch, comprise artificial water barrier Horizontal seals 7 bottom foundation pit side-wall suspension type water-stop curtain 1 and foundation ditch, bottom described foundation pit side-wall suspension type water-stop curtain 1 and described foundation ditch, artificial water barrier Horizontal seals 7 forms closed cutting off water system; Described foundation pit side-wall suspension type water-stop curtain adopts three axes agitating pile construction, water-stop curtain is got to following 500mm place bottom foundation ditch, and without the need to arriving natural water barrier, this foundation pit side-wall suspension type water-stop curtain adopts the stake composition of 600-800mm; Bottom described foundation ditch, artificial water barrier Horizontal seals is the artificial horizontal water barrier in bottom forming sealing after adopting high-pressure rotary jet grouting pile to expand the end within the scope of foundation ditch, described high-pressure rotary jet grouting pile expands end ability Reasonable Arrangement within the scope of foundation ditch according to it, and the sphere of action of high-pressure rotary jet grouting pile is diameter 2-3m; The kinetic energy utilizing super-pressure churning body to have destroys foundation soil organizational styucture following bottom foundation ditch with grouting behind shaft or drift lining, mix and blend these destroyed grogs and hardened materials, form bigbore high-pressure rotary jet grouting pile and expand end modified body 2, one deck level artificial water barrier is formed after modified body at the bottom of each expansion overlaps, bottom described foundation ditch, the thickness of artificial water barrier Horizontal seals adopts 500-800mm thickness to be good, forms good Horizontal seals layer.
Bottom described foundation pit side-wall suspension type water-stop curtain and described foundation ditch, artificial water barrier Horizontal seals forms totally enclosed sealing system.
Diaphragm wall, fender post+waterproof between piles, Construction of High Pressure Jet Grouting Pile engineering method can also be adopted to obtain about foundation pit side-wall suspension type water-stop curtain.
The construction sequence of above-mentioned closed cutting off water system is as follows:
Step (1), according to providing coordinate basis point, release stake position, set up and control stake temporarily by figure, according to bracing of foundation pit sideline digging machine excavation agitation pile guide groove, and remove underground obstacle, groove dimensions is that 1 meter of wide × 1 is meter dark.
Step (2), three axes agitating pile center distance are 600mm, stake footpath 800mm, pile-forming machine perching.
Step (3), prepare cement grout and slurries and inject, the water/binder ratio of cement grout applies according to code requirement, cement mixing content 20%, slurry flow rate is 250L/min, grouting pressure is not less than 1.0MPa, complete three axes agitating pile construction, form foundation pit side-wall suspension type water-stop curtain, this foundation pit side-wall suspension type water-stop curtain 1 also can be used as foundation pit supporting construction 3;
Step (4), employing high-pressure rotary jet grouting pile expand artificial water barrier Horizontal seals bottom end formation foundation ditch bottom foundation ditch, according to ability hole arranged position within the scope of foundation ditch at the bottom of the expansion of described high-pressure rotary jet grouting pile, and driller insertion;
Step (5), carry out described high-pressure rotary jet grouting pile and expand bottom application work, namely through preparing cement paste, after below high-pressure rotary-spray pipe casing 4 drilling rod to the substrate 500mm degree of depth transferred by startup rig, inject high pressure water and air destroys the foundation soil organizational styucture below bottom foundation ditch, then inject high pressure cement grout and air, progressively promote afterwards and spray cement injection, spray after rising to foundation ditch elevation of bottom and terminate, lift lug pipe bit bar completes the working procedure of a high-pressure rotary jet grouting pile, the inner all Construction of High Pressure Jet Grouting Pile operations of foundation ditch are completed after telephone-moving is in place, after high-pressure rotary jet grouting pile expands the end, sleeve pipe extracted and continue slip casting with conduit, guarantee substrate to cover completely and form artificial water barrier Horizontal seals bottom foundation ditch,
After bottom step (6), described foundation pit side-wall suspension type water-stop curtain and described foundation ditch, artificial water barrier Horizontal seals forms closed cutting off water system, carry out cheating interior precipitation within the scope of foundation ditch, in foundation ditch, after precipitation, groundwater table 8 is down to foundation ditch bottom surface absolute altitude less than 6;
Step (7), excavation pit.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (8)
1. the novel closed cutting off water system of water rich strata foundation ditch, comprise artificial water barrier Horizontal seals bottom foundation pit side-wall suspension type water-stop curtain and foundation ditch, bottom described foundation pit side-wall suspension type water-stop curtain and described foundation ditch, artificial water barrier Horizontal seals forms closed cutting off water system; Described foundation pit side-wall suspension type water-stop curtain is got to bottom foundation ditch following without the need to arriving natural water barrier; Bottom described foundation ditch, artificial water barrier Horizontal seals is artificial horizontal water barrier bottom the foundation ditch that adopts high-pressure rotary jet grouting pile to expand within the scope of foundation ditch to form sealing behind the end, and described high-pressure rotary jet grouting pile expands end ability Reasonable Arrangement within the scope of foundation ditch according to it.
2. the novel closed cutting off water system of water rich strata foundation ditch according to claim 1, is characterized in that, the stake composition of described foundation pit side-wall suspension type water-stop curtain employing 600-800mm or employing thickness are the diaphragm wall composition of 600-800mm.
3. the novel closed cutting off water system of water rich strata foundation ditch according to claim 1, is characterized in that, described foundation pit side-wall suspension type water-stop curtain gets to the following 500-800mm degree of depth bottom foundation ditch, does not arrive natural water barrier.
4. the novel closed cutting off water system of water rich strata foundation ditch according to claim 1, is characterized in that, bottom described foundation ditch, the thickness of artificial water barrier Horizontal seals adopts 500-800mm thickness, forms good Horizontal seals layer.
5. the novel closed cutting off water system of water rich strata foundation ditch according to claim 1, is characterized in that, the sphere of action of described high-pressure rotary jet grouting pile is diameter 2-3m.
6. the novel closed cutting off water system of water rich strata foundation ditch according to claim 1, it is characterized in that, described foundation pit side-wall suspension type water-stop curtain adopts diaphragm wall, fender post+waterproof between piles, high-pressure rotary jet grouting pile or three axes agitating pile construction to obtain.
7. the construction method of the novel closed cutting off water system of the water rich strata foundation ditch as described in claim as arbitrary in claim 1-6, step is as follows:
Step (1), carry out foundation pit side-wall suspension type water-stop curtain according to designing requirement construction layout after excavate guide groove;
Step (2), configuration cement paste, mixer rear mixing-filling in place, completes the construction of described foundation pit side-wall suspension type water-stop curtain;
Step (3), employing high-pressure rotary jet grouting pile expand artificial water barrier Horizontal seals bottom end formation foundation ditch bottom foundation ditch, according to ability hole arranged position within the scope of foundation ditch at the bottom of the expansion of described high-pressure rotary jet grouting pile, and driller insertion;
Step (4), carry out described high-pressure rotary jet grouting pile and expand bottom application work, namely through preparing cement paste, after sleeve pipe drilling rod to the following degree of depth of substrate transferred by startup rig, inject high pressure water and air destroys the foundation soil organizational styucture below bottom foundation ditch, then inject high pressure cement grout and air, progressively promote afterwards and spray cement injection, spray after rising to foundation ditch elevation of bottom and terminate, lift lug pipe bit bar completes the working procedure of a high-pressure rotary jet grouting pile, the inner all Construction of High Pressure Jet Grouting Pile operations of foundation ditch are completed after telephone-moving is in place, after high-pressure rotary jet grouting pile expands the end, substrate is covered completely and form artificial water barrier Horizontal seals bottom foundation ditch,
After bottom step (5), described foundation pit side-wall suspension type water-stop curtain and described foundation ditch, artificial water barrier Horizontal seals forms closed cutting off water system, carry out cheating interior precipitation within the scope of foundation ditch;
Step (6), excavation pit.
8. the construction method of the novel closed cutting off water system of water rich strata foundation ditch according to claim 7, is characterized in that, the sphere of action of described high-pressure rotary jet grouting pile is diameter 2-3m.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105569062A (en) * | 2015-12-11 | 2016-05-11 | 武汉广益交通科技股份有限公司 | Dewatering method implemented through permeation, weakening and emission reduction |
| CN106968264A (en) * | 2017-04-25 | 2017-07-21 | 王继忠 | A kind of construction method of deep foundation water shutoff system |
| CN108487240A (en) * | 2018-04-23 | 2018-09-04 | 大连中交理工交通技术研究院有限公司 | Churning method is molded lattice foundation |
| CN108570997A (en) * | 2018-06-07 | 2018-09-25 | 深圳市市政设计研究院有限公司 | Cofferdam and construction method are built in returning for seabed tunnel point storehouse construction |
| CN108797641A (en) * | 2018-07-20 | 2018-11-13 | 中铁十八局集团有限公司 | A kind of structure and its construction method of Underground Subway Station construction period full station sealing |
| CN109026080A (en) * | 2018-08-03 | 2018-12-18 | 中铁隆工程集团有限公司 | A kind of Underground Subway Station water sealing structure and its construction method |
| CN110485460A (en) * | 2018-05-15 | 2019-11-22 | 北京首尔工程技术有限公司 | A kind of construction method of Station bottom waterstop |
| CN110528523A (en) * | 2019-09-02 | 2019-12-03 | 湖南宏禹工程集团有限公司 | A kind of highly permeable stratum building foundation pit horizontal grouting back cover construction method |
| CN110777832A (en) * | 2019-11-08 | 2020-02-11 | 上海建工二建集团有限公司 | Waterproof curtain at end of underwater channel foundation pit along two sides of water |
| CN111305282A (en) * | 2020-04-06 | 2020-06-19 | 福建工程学院 | Subway station anti-floating system in weak water-rich stratum and construction method thereof |
| CN111335319A (en) * | 2020-04-25 | 2020-06-26 | 中国有色金属工业第六冶金建设有限公司 | Construction method of high-pressure jet grouting pile water-stop curtain open caisson |
| CN111411970A (en) * | 2020-03-25 | 2020-07-14 | 中铁三局集团有限公司 | Shield starting construction method under water-rich sand layer geological condition |
| CN111691442A (en) * | 2019-03-15 | 2020-09-22 | 包尔特殊基础工程有限公司 | Foundation pit surrounding structure in foundation and manufacturing method thereof |
| CN112081176A (en) * | 2020-09-11 | 2020-12-15 | 北京住总集团有限责任公司 | Pressure-bearing water layer vertical shaft construction method based on non-dewatering drainage |
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| CN106968264A (en) * | 2017-04-25 | 2017-07-21 | 王继忠 | A kind of construction method of deep foundation water shutoff system |
| CN108487240A (en) * | 2018-04-23 | 2018-09-04 | 大连中交理工交通技术研究院有限公司 | Churning method is molded lattice foundation |
| CN110485460A (en) * | 2018-05-15 | 2019-11-22 | 北京首尔工程技术有限公司 | A kind of construction method of Station bottom waterstop |
| CN108570997A (en) * | 2018-06-07 | 2018-09-25 | 深圳市市政设计研究院有限公司 | Cofferdam and construction method are built in returning for seabed tunnel point storehouse construction |
| CN108570997B (en) * | 2018-06-07 | 2023-11-17 | 深圳市市政设计研究院有限公司 | Backfill cofferdam for sub-bin construction of submarine tunnel and construction method |
| CN108797641A (en) * | 2018-07-20 | 2018-11-13 | 中铁十八局集团有限公司 | A kind of structure and its construction method of Underground Subway Station construction period full station sealing |
| CN109026080A (en) * | 2018-08-03 | 2018-12-18 | 中铁隆工程集团有限公司 | A kind of Underground Subway Station water sealing structure and its construction method |
| CN111691442A (en) * | 2019-03-15 | 2020-09-22 | 包尔特殊基础工程有限公司 | Foundation pit surrounding structure in foundation and manufacturing method thereof |
| CN110528523A (en) * | 2019-09-02 | 2019-12-03 | 湖南宏禹工程集团有限公司 | A kind of highly permeable stratum building foundation pit horizontal grouting back cover construction method |
| CN110777832A (en) * | 2019-11-08 | 2020-02-11 | 上海建工二建集团有限公司 | Waterproof curtain at end of underwater channel foundation pit along two sides of water |
| CN111411970A (en) * | 2020-03-25 | 2020-07-14 | 中铁三局集团有限公司 | Shield starting construction method under water-rich sand layer geological condition |
| CN111411970B (en) * | 2020-03-25 | 2022-05-13 | 中铁三局集团有限公司 | Shield starting construction method under geological condition of water-rich sand layer |
| CN111305282A (en) * | 2020-04-06 | 2020-06-19 | 福建工程学院 | Subway station anti-floating system in weak water-rich stratum and construction method thereof |
| CN111335319A (en) * | 2020-04-25 | 2020-06-26 | 中国有色金属工业第六冶金建设有限公司 | Construction method of high-pressure jet grouting pile water-stop curtain open caisson |
| CN112081176A (en) * | 2020-09-11 | 2020-12-15 | 北京住总集团有限责任公司 | Pressure-bearing water layer vertical shaft construction method based on non-dewatering drainage |
| CN112081176B (en) * | 2020-09-11 | 2022-02-01 | 北京住总集团有限责任公司 | Pressure-bearing water layer vertical shaft construction method based on non-dewatering drainage |
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Application publication date: 20150603 |