CN103290848B - Large diameter arc-shaped steel sheet pile combined foundation pit retaining structure and construction method thereof - Google Patents
Large diameter arc-shaped steel sheet pile combined foundation pit retaining structure and construction method thereof Download PDFInfo
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- CN103290848B CN103290848B CN201310246500.9A CN201310246500A CN103290848B CN 103290848 B CN103290848 B CN 103290848B CN 201310246500 A CN201310246500 A CN 201310246500A CN 103290848 B CN103290848 B CN 103290848B
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Abstract
The invention discloses a large diameter arc-shaped steel sheet pile combined foundation pit retaining structure and a construction method thereof. The retaining structure comprises large-diameter arc-shaped steel sheet piles (1) for keeping off soil and stopping water, double-cylinder cement deep layer stirring piles (2), prefabricated high-strength concrete thin-wall steel tube pipes (3), steel sheet pile connector seats (6), and steel sheet pile plugs (7). The large-diameter arc-shaped steel sheet piles (1) are connected sequentially. In two adjacent large-diameter arc-shaped steel sheet piles (1), the steel sheet pile connector seat (6) on one side of a first large-diameter arc-shaped steel sheet pile (1) is connected with the steel sheet pile connector seat (6) on the corresponding side of a second large-diameter arc-shaped steel sheet pile (1), and the connector is arranged in the corresponding double-cylinder cement deep layer stirring pile (2). The prefabricated high-strength concrete thin-wall steel tube pipes (3) are inserted in the double-cylinder cement deep layer stirring piles (2) at intervals according to the design. A complete and continuous foundation pit retaining structure is formed after sequential construction. The cement deep layer stirring piles are used for preventing leakage of connectors.
Description
Technical field
The present invention relates to a kind of major diameter arc-shaped steel sheet pile combined foundation ditch support structure and construction method thereof, belong to geotechnical engineering Base hole supporting technology field.Be applicable to cutting depth, groundwater table buries shallow base pit engineering space enclosing structure, especially more aobvious advantage under the geological conditions such as weak clay, silt that water content is high.
Background technology
Foundation pit supporting construction can be divided into cast in situs formula and prefabricated assembled two kinds according to manufacture craft.The foundation pit supporting construction of cast in situs generally refers at the construction field (site), first grooving, lay reinforcing cage, encapsulating compound gel material is formed and possesses some strength again, can bear the structure of lateral earth pressure, water pressure, conventional has bored pile, diaphragm wall etc., also has and first carries out Soil-cement, insert shaped steel again, as SMW engineering method stake etc.Cast in situs formula supporting and protection structure has good integrity, rigidity is large, anti-leakage performance is good, be suitable for the advantages such as geological conditions is extensive, and its shortcoming is that job site is polluted large, construction and needed that heavy mechanical equipment, construction technology process are comparatively complicated, the construction period is longer, construction costs is more high.
Prefabricated assembled foundation pit supporting construction generally refers to that supporting barricade completes, and only need assemble at the construction field (site) and implement, as steel pipe pile, steel sheet pile etc.This kind of support pattern has the advantages such as job site is pollution-free, construction technology is simple, speed of application is fast, the recyclable recycling of supporting and protection structure.But its shortcoming is also comparatively obvious, steel pipe pile steel using amount is large, comparatively large to soil disturbance, and then endurance and stiffness is less, distortion is larger for steel sheet pile.
When requiring higher to foundation pit supporting construction lateral deformation, when foundation ditch surrounding enviroment are comparatively responsive to WATER LEVEL CHANGES, simple pre-manufactured steel sheet pile supporting and protection structure shortcoming makes it to meet lateral rigidity and requires, cannot meet sealing requirement, especially in excavation of foundation pit depth bounds, major part is the weak soil that water content is high, and during the stronger soil layer of the water permeability such as silt, flour sand, more answer careful in selecting.
Summary of the invention
Technical problem: the object of the invention is to provide that a kind of endurance and stiffness is large, stagnant water effect good, construction method is quick, practicality cheap, capable of circulation, the major diameter arc-shaped steel sheet pile combined foundation ditch support structure having gear soil and water stopping function concurrently and construction method thereof.
Technical scheme: a kind of major diameter arc-shaped steel sheet pile combined foundation ditch support structure of the present invention comprises major diameter arc-shaped steel sheet pile, dual cylinders cement-soil mixing pile, prefabricated high-strength concrete thin steel pipe pile, steel sheet pile plinth, steel sheet pile plug for keeping off soil and sealing;
Major diameter arc-shaped steel sheet pile is linked in sequence, in two adjacent major diameter arc-shaped steel sheet piles, the steel sheet pile plinth of first major diameter arc-shaped steel sheet pile side is connected with the steel sheet pile plug of the respective side of second major diameter arc-shaped steel sheet pile, its joint is placed in dual cylinders cement-soil mixing pile, prefabricated high-strength concrete thin steel pipe pile alternates in dual cylinders cement-soil mixing pile according to design, and sequence construction forms complete continuous print foundation pit supporting construction successively.
High-strength concrete thin steel pipe pile adopts H profile steel to replace.
The construction method of a kind of major diameter arc-shaped steel sheet pile combined foundation ditch support structure of the present invention comprises the steps:
The first step: according to engineering geological conditions and the excavation of foundation pit degree of depth, according to the regulation of " building foundation pit supporting tecnical regulations (JGJ120-99) " 4.2,4.3, design major diameter arc-shaped steel sheet pile width, thickness; According to the regulation of " building foundation treatment technical specification (JGJ79_2002) " 11.2, design dual cylinders cement-soil mixing pile cross section, cement mixing content; According to the regulation of " building foundation pit supporting tecnical regulations (JGJ120-99) " 4.2,4.3, design prefabricated high-strength concrete thin-wall steel tube pile spacing, size;
Second step: according to the regulation of " building foundation pit supporting tecnical regulations (JGJ120-99) " 4.5,4.6, design stake apical cap beam size and internal support of foundation pit size and spacing;
3rd step: construction dual cylinders cement-soil mixing pile;
4th step: first insert major diameter arc-shaped steel sheet pile, then insert prefabricated high-strength concrete thin steel pipe pile;
5th step: construction stake apical cap beam and internal support of foundation pit;
6th step: soil excavation in foundation ditch, completes underground structure main body construction;
7th step: remove internal support of foundation pit and stake apical cap beam, extract major diameter arc-shaped steel sheet pile and prefabricated high-strength concrete thin steel pipe pile, Foundation Pit Construction terminates.
Beneficial effect: the present invention adopts above technical scheme, possesses following advantage compared with prior art: major diameter curved plate pile pit supporting construction of the present invention, and large compared with traditional steel sheet pile width, can reach 800mm ~ 1200mm, speed of application is faster; The prefabricated high-strength concrete thin steel pipe pile (or H profile steel) of inserting improves supporting and protection structure lateral rigidity greatly, effectively can control Supporting Structure deformation; The pin and box sub of major diameter arc-shaped steel sheet pile is placed in cement-soil mixing pile, makes it sealing performance better; Construction on Environment impact is little, and material is capable of circulation repeatedly to be used.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and case study on implementation, the invention will be further described.
Fig. 1: major diameter arc-shaped steel sheet pile combined foundation ditch support structural plan schematic diagram,
Fig. 2: major diameter arc-shaped steel sheet pile combined foundation ditch support structural facades schematic diagram.
Have in above figure: major diameter arc-shaped steel sheet pile 1; Cement-soil mixing pile 2; Prefabricated high-strength concrete thin steel pipe pile 3; Stake apical cap beam 4; Internal support of foundation pit 5; Steel sheet pile female 6; Steel sheet pile male 7.
Detailed description of the invention
Below in conjunction with accompanying drawing 1, accompanying drawing 2, technical scheme of the present invention is described in detail:
A kind of major diameter arc-shaped steel sheet pile combined foundation ditch support structure of the present invention and construction method thereof, its feature mainly comprises the steps:
The first step: according to engineering geological conditions and the excavation of foundation pit degree of depth, according to the regulation of " building foundation pit supporting tecnical regulations (JGJ120-99) " 4.2,4.3, design major diameter arc-shaped steel sheet pile 1 width, thickness; According to the regulation of " building foundation treatment technical specification (JGJ79_2002) " 11.2, design cement-soil mixing pile 2 cross section, cement mixing content; According to the regulation of " building foundation pit supporting tecnical regulations (JGJ120-99) " 4.2,4.3, design prefabricated high-strength concrete thin steel pipe pile 3 spacing, size;
Second step: design stake apical cap beam 4 size and internal support of foundation pit 5 size and spacing;
3rd step: construction cement-soil mixing pile 2;
4th step: first insert major diameter arc-shaped steel sheet pile 1, then insert prefabricated high-strength concrete thin steel pipe pile (or H profile steel) 3;
5th step: construction stake apical cap beam 4 and internal support of foundation pit 5;
6th step: soil excavation in foundation ditch, completes underground structure main body construction;
7th step: remove internal support of foundation pit 5 and stake apical cap beam 4, extract major diameter arc-shaped steel sheet pile 1 and prefabricated high-strength concrete thin steel pipe pile (or H profile steel) 3, Foundation Pit Construction terminates.
Claims (3)
1. a major diameter arc-shaped steel sheet pile combined foundation ditch support structure, is characterized in that this supporting and protection structure comprises major diameter arc-shaped steel sheet pile (1), dual cylinders cement-soil mixing pile (2), prefabricated high-strength concrete thin steel pipe pile (3), steel sheet pile plinth (6), steel sheet pile plug (7) for keeping off soil and sealing;
Major diameter arc-shaped steel sheet pile (1) is linked in sequence, in two adjacent major diameter arc-shaped steel sheet piles (1), the steel sheet pile plinth (6) of first major diameter arc-shaped steel sheet pile (1) side is connected with the steel sheet pile plug (7) of the respective side of second major diameter arc-shaped steel sheet pile (1), its joint is placed in dual cylinders cement-soil mixing pile (2), prefabricated high-strength concrete thin steel pipe pile (3) alternates in dual cylinders cement-soil mixing pile (2) according to design, and sequence construction forms complete continuous print foundation pit supporting construction successively.
2. major diameter arc-shaped steel sheet pile combined foundation ditch support structure according to claim 1, is characterized in that high-strength concrete thin steel pipe pile (3) adopts H profile steel to replace.
3. a construction method for a kind of major diameter arc-shaped steel sheet pile combined foundation ditch support structure as claimed in claim 1 or 2, is characterized in that this construction method comprises the steps:
The first step: according to engineering geological conditions and the excavation of foundation pit degree of depth, according to the regulation of " building foundation pit supporting tecnical regulations (JGJ120-99) " 4.2,4.3, design major diameter arc-shaped steel sheet pile (1) width, thickness; According to the regulation of " building foundation treatment technical specification (JGJ79_2002) " 11.2, design dual cylinders cement-soil mixing pile (2) cross section, cement mixing content; According to the regulation of " building foundation pit supporting tecnical regulations (JGJ120-99) " 4.2,4.3, design prefabricated high-strength concrete thin steel pipe pile (3) spacing, size;
Second step: according to the regulation of " building foundation pit supporting tecnical regulations (JGJ120-99) " 4.5,4.6, design stake apical cap beam (4) size and internal support of foundation pit (5) size and spacing;
3rd step: construction dual cylinders cement-soil mixing pile (2);
4th step: first insert major diameter arc-shaped steel sheet pile (1), then insert prefabricated high-strength concrete thin steel pipe pile (3);
5th step: construction stake apical cap beam (4) and internal support of foundation pit (5);
6th step: soil excavation in foundation ditch, completes underground structure main body construction;
7th step: remove internal support of foundation pit (5) and stake apical cap beam (4), extract major diameter arc-shaped steel sheet pile (1) and prefabricated high-strength concrete thin steel pipe pile (3), Foundation Pit Construction terminates.
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CN104278671B (en) * | 2014-10-28 | 2016-01-27 | 南京工业大学 | Stiff cement-soil stirring support pile inserted into inverted cup-shaped steel barrel and construction method thereof |
CN104746928B (en) * | 2015-04-08 | 2017-01-11 | 中船第九设计研究院工程有限公司 | Arc plate structural unit and air-pressure-resistant steel plate wall connected through same |
CN104895066B (en) * | 2015-06-09 | 2016-08-24 | 杭州江润科技有限公司 | The construction method of overlength churning strength core built pile |
CN106906831A (en) * | 2017-04-28 | 2017-06-30 | 化学工业岩土工程有限公司 | A kind of smooth Corrugated Arch Steel Sheet pile foundation pit supporting method and supporting |
CN110924401A (en) * | 2019-12-13 | 2020-03-27 | 武汉武水水利生态工程技术有限公司 | Construction foundation pit supporting mode for combined arching and bearing of mixing piles and cast-in-place piles |
CN112031003A (en) * | 2020-09-09 | 2020-12-04 | 江苏科技大学 | Support device with combined action of pile and soil and construction method thereof |
CN114086568A (en) * | 2021-12-23 | 2022-02-25 | 中城建(福建)建筑设计研究院有限公司 | Foundation pit support structure and construction method thereof |
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