CN103556641A - Grooving assisting method for in-pit underground diaphragm wall of existing basement - Google Patents

Grooving assisting method for in-pit underground diaphragm wall of existing basement Download PDF

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Publication number
CN103556641A
CN103556641A CN201310470452.1A CN201310470452A CN103556641A CN 103556641 A CN103556641 A CN 103556641A CN 201310470452 A CN201310470452 A CN 201310470452A CN 103556641 A CN103556641 A CN 103556641A
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China
Prior art keywords
pile
underground
continuous
construction
grooving
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Pending
Application number
CN201310470452.1A
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Chinese (zh)
Inventor
周冠南
崔涛
李有德
赵立华
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China Railway 13th Bureau Group Co Ltd
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China Railway 13th Bureau Group Co Ltd
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Priority to CN201310470452.1A priority Critical patent/CN103556641A/en
Publication of CN103556641A publication Critical patent/CN103556641A/en
Pending legal-status Critical Current

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Abstract

Disclosed is a grooving assisting method for an in-pit underground diaphragm wall of an existing basement. By a method combining pile extracting and cemented soil backfilling, compaction grouting, three-axis agitating pile groove wall reinforcement and pre-precipitation reinforcement before grooving, grooving of the underground diaphragm wall is carried out smoothly. The method includes the steps: firstly, according to on-site actual hydrogeological condition, arranging a precipitation well, performing pre-precipitation construction, and enabling an underground water head to be lower than a slurry surface during grooving of the underground diaphragm wall; secondly, using cemented soil for backfilling holes generated after pile extracting; thirdly, performing compaction grouting at pile-extracted hole positions; fourthly, performing three-axis agitating pile reinforcement on groove walls, with the pile-extracted positions invaded, on two sides of the underground diaphragm wall; fifthly, performing underground diaphragm wall construction. The method has the advantages of being suitable for deep foundation pit engineering constructing on the floor of the existing basement and capable of guaranteeing smooth proceeding of the underground diaphragm wall construction, having considerable value in the aspects of engineering quality and construction safety, and being mature in technology and good in construction effect.

Description

Continuous wall trench underground householder method in a kind of existing basement hole
Technical field
The present invention relates to base pit engineering class, specifically relate to a kind of grooving ancillary method in construction of diaphragm wall in existing basement hole.
Background technology
Along with the utilization of continually developing of urban underground space, there is the deep-foundation pit engineering of reconstructing in a large number on original building.Before the Construction of Deep Excavation Engineering of the type, need original building to remove.The space enclosing structure of original base pit engineering and pile foundation are pulled out and can be produced serious disturbance to the soil body, and on original base plate of foundation pit, carry out construction of diaphragm wall and will face the problem of underground water head higher than mud liquid level.If can not address the above problem, diaphragm wall cannot be constructed or construction quality extreme difference.
Through the literature search to prior art, finding not yet has with backfill cement-soil, compaction grouting, and the method that three axle agitation pile cell walls are reinforced and the front pre-precipitation of grooving combines is carried out auxiliary method to continuous wall trench underground in existing basement hole.
Summary of the invention
The present invention is directed to the difficult point of continuous wall trench underground construction in existing basement hole, having proposed series of measures combines, trenching construction is assisted, object is for the difficult point such as overcome Groundwater head height in the construction of such deep-foundation pit engineering continuous wall trench underground, undisturbed soil disturbance is large, the soil body is unstable, grooving is carried out smoothly, improve construction of diaphragm wall quality and construction safety, spy provides continuous wall trench underground householder method in a kind of existing basement hole.
The invention provides continuous wall trench underground householder method in a kind of existing basement hole, it is characterized in that: continuous wall trench underground householder method in described existing basement hole, by pile pulling backfill cement-soil, compaction grouting, three axle agitation pile cell walls, before grooving, pre-precipitation is reinforced the method combining, and continuous wall trench underground is carried out smoothly;
Step 1: according to the actual hydrogeological situation in scene, arrange dewatering well, carry out pre-dewatering construction, the mud face while making underground water head lower than continuous wall trench underground;
Step 2: with the hole producing after cement-soil backfill pile pulling;
Step 3: carry out compaction grouting in pile pulling hole location;
Step 4: the diaphragm wall both sides cell wall of being invaded by pile pulling position is carried out to three axle cement mixing methods;
Step 5: carry out construction of diaphragm wall.
The described parallel groove inside of continuous underground wall of being close to of three axle agitation piles, and reserved 8~12cm; Dewatering well well head 0.3~0.5m above ground level, the peripheral clay packing that adopts of the borehole wall, its degree of depth is not less than 2.0m; Well casing adopts steel pipe, diameter 250~300mm; Filter pipe adopts circular hole filter pipe, diameter 250~300mm, outsourcing 60 order nylon leaching nets; Gravel material upwards pushes up above 1m and encloses and fill out medium coarse sand to aquifer from shaft bottom; The same footpath of sediment tube and filter pipe, length 0.8~1.5m, shutoff is added a cover in sediment tube bottom; The cement-soil earthwork must not select the block being greater than more than 5cm, must not have building waste admixture, and cement adopts more than 32.5 Portland cements; Cement mixing content is controlled at 7~9%, and intensity is 0.4~0.6MPa; The compaction grouting degree of depth is identical with the pile foundation degree of depth of pulling out, slurry water gray scale 0.55, and grouting pressure 0.2~0.3MPa, guarantees pore-forming, grooving quality; Three axle agitation pile cell walls are reinforced the pattern that adopts Φ 850@600, and stake heart off normal is no more than 40mm, and the error of perpendicularity must not be long over 1/200 stake.
Advantage of the present invention:
Continuous wall trench underground householder method in existing basement of the present invention hole, be applicable to the deep-foundation pit engineering of constructing on existing basement bottom board, the difficult point such as overcome Groundwater head height in the construction of such deep-foundation pit engineering continuous wall trench underground, undisturbed soil disturbance is large, the soil body is unstable, grooving is carried out smoothly, improved construction of diaphragm wall quality and construction safety.By pile pulling backfill cement-soil, compaction grouting, three axle agitation pile cell walls, pre-precipitation is reinforced the method combining before grooving, guarantees that continuous wall trench underground construction carries out smoothly, and there is to considerable value the aspects such as workmanship and construction safety, technical maturity, construction effect is good.
Accompanying drawing explanation
Below in conjunction with drawings and the embodiments, the present invention is further detailed explanation:
Fig. 1 is that in existing basement hole, continuous wall trench underground householder method dewatering well is arranged exemplary plot;
Fig. 2 is that in existing basement hole, continuous wall trench underground householder method three axle agitation pile cell walls are reinforced exemplary plot;
Fig. 3 is continuous wall trench underground householder method process flow chart in existing basement hole.
The specific embodiment
Embodiment 1
The present embodiment provides continuous wall trench underground householder method in a kind of existing basement hole, it is characterized in that: continuous wall trench underground householder method in described existing basement hole, by pile pulling backfill cement-soil, compaction grouting, three axle agitation pile cell walls, before grooving, pre-precipitation is reinforced the method combining, and continuous wall trench underground is carried out smoothly;
Step 1: according to the actual hydrogeological situation in scene, arrange dewatering well, carry out pre-dewatering construction, the mud face while making underground water head lower than continuous wall trench underground;
Step 2: with the hole producing after cement-soil backfill pile pulling;
Step 3: carry out compaction grouting in pile pulling hole location;
Step 4: the diaphragm wall both sides cell wall of being invaded by pile pulling position is carried out to three axle cement mixing methods;
Step 5: carry out construction of diaphragm wall.
The described parallel groove inside of continuous underground wall of being close to of three axle agitation piles, and reserved 8cm; Dewatering well well head 0.3m above ground level, the peripheral clay packing that adopts of the borehole wall, its degree of depth is not less than 2.0m; Well casing adopts steel pipe, diameter 250mm; Filter pipe adopts circular hole filter pipe, diameter 250mm, outsourcing 60 order nylon leaching nets; Gravel material upwards pushes up above 1m and encloses and fill out medium coarse sand to aquifer from shaft bottom; The same footpath of sediment tube and filter pipe, length 0.8m, shutoff is added a cover in sediment tube bottom; The cement-soil earthwork must not select the block being greater than more than 5cm, must not have building waste admixture, and cement adopts more than 32.5 Portland cements; Cement mixing content is controlled at 7%, and intensity is 0.4MPa; The compaction grouting degree of depth is identical with the pile foundation degree of depth of pulling out, slurry water gray scale 0.55, and grouting pressure 0.2MPa, guarantees pore-forming, grooving quality; Three axle agitation pile cell walls are reinforced the pattern that adopts Φ 850@600, and stake heart off normal is no more than 40mm, and the error of perpendicularity must not be long over 1/200 stake.
Embodiment 2
The present embodiment provides continuous wall trench underground householder method in a kind of existing basement hole, it is characterized in that: continuous wall trench underground householder method in described existing basement hole, by pile pulling backfill cement-soil, compaction grouting, three axle agitation pile cell walls, before grooving, pre-precipitation is reinforced the method combining, and continuous wall trench underground is carried out smoothly;
Step 1: according to the actual hydrogeological situation in scene, arrange dewatering well, carry out pre-dewatering construction, the mud face while making underground water head lower than continuous wall trench underground;
Step 2: with the hole producing after cement-soil backfill pile pulling;
Step 3: carry out compaction grouting in pile pulling hole location;
Step 4: the diaphragm wall both sides cell wall of being invaded by pile pulling position is carried out to three axle cement mixing methods;
Step 5: carry out construction of diaphragm wall.
The described parallel groove inside of continuous underground wall of being close to of three axle agitation piles, and reserved 10cm; Dewatering well well head 0.4m above ground level, the peripheral clay packing that adopts of the borehole wall, its degree of depth is not less than 2.0m; Well casing adopts steel pipe, diameter 273mm; Filter pipe adopts circular hole filter pipe, diameter 273mm, outsourcing 60 order nylon leaching nets; Gravel material upwards pushes up above 1m and encloses and fill out medium coarse sand to aquifer from shaft bottom; The same footpath of sediment tube and filter pipe, length 1m, shutoff is added a cover in sediment tube bottom; The cement-soil earthwork must not select the block being greater than more than 5cm, must not have building waste admixture, and cement adopts more than 32.5 Portland cements; Cement mixing content is controlled at 8%, and intensity is 0.5MPa; The compaction grouting degree of depth is identical with the pile foundation degree of depth of pulling out, slurry water gray scale 0.55, and grouting pressure 0.25MPa, guarantees pore-forming, grooving quality; Three axle agitation pile cell walls are reinforced the pattern that adopts Φ 850@600, and stake heart off normal is no more than 40mm, and the error of perpendicularity must not be long over 1/200 stake.
Embodiment 3
The present embodiment provides continuous wall trench underground householder method in a kind of existing basement hole, it is characterized in that: continuous wall trench underground householder method in described existing basement hole, by pile pulling backfill cement-soil, compaction grouting, three axle agitation pile cell walls, before grooving, pre-precipitation is reinforced the method combining, and continuous wall trench underground is carried out smoothly;
Step 1: according to the actual hydrogeological situation in scene, arrange dewatering well, carry out pre-dewatering construction, the mud face while making underground water head lower than continuous wall trench underground;
Step 2: with the hole producing after cement-soil backfill pile pulling;
Step 3: carry out compaction grouting in pile pulling hole location;
Step 4: the diaphragm wall both sides cell wall of being invaded by pile pulling position is carried out to three axle cement mixing methods;
Step 5: carry out construction of diaphragm wall.
The described parallel groove inside of continuous underground wall of being close to of three axle agitation piles, and reserved 12cm; Dewatering well well head 0.5m above ground level, the peripheral clay packing that adopts of the borehole wall, its degree of depth is not less than 2.0m; Well casing adopts steel pipe, diameter 300mm; Filter pipe adopts circular hole filter pipe, diameter 300mm, outsourcing 60 order nylon leaching nets; Gravel material upwards pushes up above 1m and encloses and fill out medium coarse sand to aquifer from shaft bottom; The same footpath of sediment tube and filter pipe, length 1.5m, shutoff is added a cover in sediment tube bottom; The cement-soil earthwork must not select the block being greater than more than 5cm, must not have building waste admixture, and cement adopts more than 32.5 Portland cements; Cement mixing content is controlled at 9%, and intensity is 0.6MPa; The compaction grouting degree of depth is identical with the pile foundation degree of depth of pulling out, slurry water gray scale 0.55, and grouting pressure 0.3MPa, guarantees pore-forming, grooving quality; Three axle agitation pile cell walls are reinforced the pattern that adopts Φ 850@600, and stake heart off normal is no more than 40mm, and the error of perpendicularity must not be long over 1/200 stake.

Claims (2)

1. an existing basement is cheated interior continuous wall trench underground householder method, it is characterized in that: continuous wall trench underground householder method in described existing basement hole, by pile pulling backfill cement-soil, compaction grouting, three axle agitation pile cell walls, before grooving, pre-precipitation is reinforced the method combining, and continuous wall trench underground is carried out smoothly; Step 1: according to the actual hydrogeological situation in scene, arrange dewatering well, carry out pre-dewatering construction, the mud face while making underground water head lower than continuous wall trench underground; Step 2: with the hole producing after cement-soil backfill pile pulling; Step 3: carry out compaction grouting in pile pulling hole location; Step 4: the diaphragm wall both sides cell wall of being invaded by pile pulling position is carried out to three axle cement mixing methods; Step 5: carry out construction of diaphragm wall.
2. according to continuous wall trench underground householder method in existing basement claimed in claim 1 hole, it is characterized in that: the described parallel groove inside of continuous underground wall of being close to of three axle agitation piles, and reserved 8~12cm; Dewatering well well head 0.3~0.5m above ground level, the peripheral clay packing that adopts of the borehole wall, its degree of depth is not less than 2.0m; Well casing adopts steel pipe, diameter 250~300mm; Filter pipe adopts circular hole filter pipe, diameter 250~300mm, outsourcing 60 order nylon leaching nets; Gravel material upwards pushes up above 1m and encloses and fill out medium coarse sand to aquifer from shaft bottom; The same footpath of sediment tube and filter pipe, length 0.8~1.5m, shutoff is added a cover in sediment tube bottom; The cement-soil earthwork must not select the block being greater than more than 5cm, must not have building waste admixture, and cement adopts more than 32.5 Portland cements; Cement mixing content is controlled at 7~9%, and intensity is 0.4~0.6MPa; The compaction grouting degree of depth is identical with the pile foundation degree of depth of pulling out, slurry water gray scale 0.55, and grouting pressure 0.2~0.3MPa, guarantees pore-forming, grooving quality; Three axle agitation pile cell walls are reinforced the pattern that adopts Φ 850@600, and stake heart off normal is no more than 40mm, and the error of perpendicularity must not be long over 1/200 stake.
CN201310470452.1A 2013-10-09 2013-10-09 Grooving assisting method for in-pit underground diaphragm wall of existing basement Pending CN103556641A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104612179A (en) * 2014-12-31 2015-05-13 上海市机械施工集团有限公司 Construction method for underground diaphragm wall penetrating through super-thick silt layer
CN104831762A (en) * 2015-04-30 2015-08-12 宁波大学 Dynamic monitoring system and monitoring method of deep foundation pit confined water drawdown
CN105696550A (en) * 2014-11-27 2016-06-22 五冶集团上海有限公司 Three axes agitating pile construction method capable of assisting in grooving of reinforced underground diaphragm wall

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Publication number Priority date Publication date Assignee Title
CN105696550A (en) * 2014-11-27 2016-06-22 五冶集团上海有限公司 Three axes agitating pile construction method capable of assisting in grooving of reinforced underground diaphragm wall
CN105696550B (en) * 2014-11-27 2017-08-25 五冶集团上海有限公司 A kind of three axes agitating pile construction method of additional reinforcement continuous wall trench underground
CN104612179A (en) * 2014-12-31 2015-05-13 上海市机械施工集团有限公司 Construction method for underground diaphragm wall penetrating through super-thick silt layer
CN104831762A (en) * 2015-04-30 2015-08-12 宁波大学 Dynamic monitoring system and monitoring method of deep foundation pit confined water drawdown

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Application publication date: 20140205