CN105714832A - Deep-foundation-pit large-sized precast building envelope and construction method - Google Patents
Deep-foundation-pit large-sized precast building envelope and construction method Download PDFInfo
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- CN105714832A CN105714832A CN201610111348.7A CN201610111348A CN105714832A CN 105714832 A CN105714832 A CN 105714832A CN 201610111348 A CN201610111348 A CN 201610111348A CN 105714832 A CN105714832 A CN 105714832A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention discloses a deep-foundation-pit large-sized precast building envelope and a construction method. The deep-foundation-pit large-sized precast building envelope comprises composite piles and jet grouting piles or mixing piles, wherein the jet grouting piles or the mixing piles are positioned between adjacent composite piles and are engaged with the composite piles, each of the composite piles comprises a precast pile and soil cement which is stuffed in the outer ring of each precast pile, and the soil cement and each precast pile integrally form a cylindrical composite pile structure. The building envelope has double effects of blocking soil and stopping water, wherein the soil blocking effect is realized through the composite piles, holes in the composite piles are circular, and the precast piles are implanted in the holes; the water stopping effect is realized through the engaging of the soil cement of the composite piles and the jet grouting piles or the mixing piles between the composite piles. According to the building envelope and the construction method disclosed by the invention, the precast piles in pile foundation engineering are introduced in the building envelope in the deep foundation pit engineering, and displacement piles are changed into low displacement piles, so that the applicability of stratums of the precast piles is improved; the pile making quality and the pile forming quality are guaranteed, the precast piles can smoothly reach designed depth, and pile cutting is avoided; the supporting piles and water stopping are combined.
Description
Technical field
The present invention relates to construction engineering technical field, particularly relate to a kind of building enclosure promoting prefabricated industrialization management to develop in deep foundation pit support field and construction method.
Background technology
Deep foundation pit of construction engineering building enclosure is generally adopted cast-in-situ bored pile, outside injection rotary churning pile or mixing pile sealing.Along with deep-foundation pit engineering gradually to the development of deep, general orientation, building enclosure is inevitable to be developed to large scale, owing to size and the degree of depth strengthen, causes that building enclosure construction quality is poor, speed of application is slow.
Prefabricated pile is commonly used in building pile foundation engineering, existing process for sinking is mainly static pressure and hammering two kinds by force, both technique belongs to Squeezing Soil Pile, should not be used in downtown area intensive building, close on road and underground utilities and intersect various area, because of piling time the exclusion amount of the soil body is big, thus producing earth horizontal displacement and vertical displacement (protuberance), particularly such as hard folder soil layer or round gravel layer during piling, pile top is difficult to enter designed elevation, cause the serious damage of stake, delay the engineering time and cause loss economically, and have a strong impact on Adjacent Buildings, road, the safety of structures.
In order to solve this difficult problem, one of traditional method is to cut stake, is namely cut out on the top of stake when stake is not gone down, the existence of this method has the drawback that both wastes raw material, destroy again original result and the prestressing force of stake, have a strong impact on the intensity of pile foundation, it is difficult to make the quality of building be protected；Two is first carry out drawing hole before pile sinking, and the existence of this method has the drawback that in level of ground water district higher, especially sand-pebble layer, it is easy to collapse hole, it is difficult to ensure that hole quality.
Summary of the invention
For Problems existing in background technology and weak point, it is desirable to provide a kind of large size prefabricated building enclosure of deep basal pit and construction method.
The technical solution used in the present invention is as follows:
A kind of large size prefabricated building enclosure of deep basal pit, including composite pile with between adjacent composite pile and carry out the rotary churning pile or the mixing pile that are engaged with composite pile, described composite pile includes a prefabricated pile, and it being filled in the soil cement of prefabricated pile outer ring, described soil cement and prefabricated pile are monolithically fabricated a cylindrical composite pile structure.
Further, described rotary churning pile is by high pressure spray jetting, soil, serosity, cutting soil, forms cement earth pile；The while that described mixing pile being by drilling tool cutting soil, injecting serosity, drilling tool stirs the soil body and serosity, the cement earth pile of formation.
Further, described soil cement is engaged guarantee sealing with rotary churning pile between composite pile or mixing pile.
Further, described all-hydraulic drill is a kind of full-hydraulic multifunctional stake machine, is equipped with hollow type long screw drill rod；It is suitable for various soil, layer of sand, cobble stratum；Drilling diameterThe degree of depth is up to more than 30 meters.
Further, between prefabricated pile, rotary churning pile or mixing pile are engaged size with composite pile and are determined by design, and rotary churning pile or mixing pile axis are compared with composite pile axis, outside deflection foundation ditch, it is ensured that under lateral earth pressure effect outside, occlusal surface pressurized, stagnant water effect is good.
Further, the cross section of described prefabricated pile is rectangle, I-shaped, circular or trapezoidal.
Further, the dead in line of the outer ring that the axis of described prefabricated pile is formed with soil cement.
The construction method of the large size prefabricated building enclosure of a kind of deep basal pit, comprises the steps:
A. all-hydraulic drill is in place: peg positions, and all-hydraulic drill centering is in place；
B. drilling and forming hole: start all-hydraulic drill, auger stem is drilled down into desired depth along leading truck, promotes auger stem, is all taken out by soil in desired depth；
C. continue to creep into, whitewash: again descend auger stem to desired depth, creep into while high pressure spray jetting, serosity, gas, high-pressure injection cutting soil so that aperture below desired depth increases；Rotated by auger stem, the soil body of mixing water, serosity and cutting, form soil cement, creep into projected depth, promote auger stem, become cement earth pile；
D. all-hydraulic drill displacement: carry out next root composite pile pore-forming operation；
E. pile extension platform is in place: pile extension platform is connected with pedrail crane, and mobile pedrail crane makes pile extension platform centering in place；
F. pile follower: pedrail crane hangs first segment prefabricated pile, and prefabricated pile top exceeds pile extension platform, reserved pile extension work surface, fixing prefabricated pile；
G. pile extension, put stake: pedrail crane lifting second section prefabricated pile above first segment prefabricated pile, machinery pile extension after open pile extension platform locking cylinder, prefabricated pile by gravity sink；
H. Pile feeder and vibration hammer are connected；When prefabricated pile leans on gravity to sink, pile extension platform oil cylinder locking, it is sequentially connected with Pile feeder and vibration hammer；
I. vibrate piling: Vibration on Start-up hydraulic means, prefabricated pile is depressed into projected depth；
J. stake operation under next root prefabricated pile is carried out；
K. rotary churning pile between the stake of injection composite pile or mixing pile.
Further, desired depth described in step b is determined according to test and geologic prospect report, and both having prevented boring desired depth collapse hole, after ensureing again press-in prefabricated pile, soil cement lifting height is less than desired depth.
Further, in step c the height creeping into speed and high-pressure injection of auger stem spray power according to test and geologic prospect report determine, it is ensured that serosity and soil are sufficiently mixed, formed homogenizing soil cement；Ensure that soil cement drilling diameter is slightly larger than drilling diameter in the desired depth of top, is engaged larger with rotary churning pile.
Further, described rotary churning pile is by high pressure spray jetting, soil, serosity, cutting soil, forms cement earth pile；The while that described mixing pile being by drilling tool cutting soil, injecting serosity, drilling tool stirs the soil body and serosity, the cement earth pile of formation.
Beneficial effects of the present invention is as follows:
1, pile-forming speed is fast, and pile quality is reliable, and efficiency is high, and noise is low, circulates without mud, is not limited by subsoil water.
2, the feature not being suitable for the stratum such as sandy gravel, drift sand that tradition pile sinking mode exists is overcome, it is shown that superiority greatly.
3, serosity configures in advance, and formed soil cement uniformity high parameters index controllability is strong.
4, can be widely applied to the pile foundation of civil construction project, apply also for the fender post of deep-foundation pit engineering, water-stop curtain etc..
5, be conducive to promoting the prefabricated industrialized development of Urban Underground Space Excavation.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the large size prefabricated building enclosure horizontal layout schematic diagram of deep basal pit；
Fig. 2 is deep basal pit large size prefabricated composite pile construction vertical section schematic diagram.
In figure: 1 soil cement, 2 prefabricated piles, 3 rotary churning piles or mixing pile.
Detailed description of the invention
Continue to describe in detail to the present invention below in conjunction with accompanying drawing:
The present invention is directed to Problems existing and weak point in background technology, it is desirable to provide a kind of large size prefabricated building enclosure of deep basal pit and construction method.Building enclosure has gear soil and sealing dual function；Gear soil acts through a kind of composite pile and realizes, and composite pile pore-forming is circular, and hole is implanted into prefabricated pile；Sealing acts through composite pile soil cement and is engaged realization with rotary churning pile between composite pile or mixing pile.Prefabricated pile in pile foundation engineering is incorporated in the building enclosure in deep-foundation pit engineering by this invention, and change Squeezing Soil Pile is low Squeezing Soil Pile, expands the suitability of prefabricated pile stratum；Ensure that stake processed and pile quality, prefabricated pile can arrive projected depth smoothly, it is to avoid cuts stake；Fender post and sealing combine.Below in conjunction with accompanying drawing, the present invention is described in detail:
As shown in Figure 1, a kind of large size prefabricated building enclosure of deep basal pit, including composite pile with between adjacent composite pile and carry out the rotary churning pile or the mixing pile 3 that are engaged with composite pile, described composite pile includes a prefabricated pile 2, and it being filled in the soil cement 1 of prefabricated pile 2 outer ring, described soil cement 1 is monolithically fabricated a cylindrical composite pile structure with prefabricated pile 2.
Further, described soil cement 1 is engaged guarantee sealing with rotary churning pile between composite pile or mixing pile.
Further, described all-hydraulic drill is a kind of full-hydraulic multifunctional stake machine, is equipped with hollow type long screw drill rod；It is suitable for various soil, layer of sand, cobble stratum；Drilling diameterThe degree of depth is up to more than 30 meters.
Further, rotary churning pile or mixing pile are engaged size with composite pile and are determined by design, and rotary churning pile or mixing pile axis are compared with composite pile axis, outside deflection foundation ditch, it is ensured that under lateral earth pressure effect outside, occlusal surface pressurized, stagnant water effect is good.
Further, the cross section of described prefabricated pile 2 is rectangle, I-shaped, circular or trapezoidal.
Further, the dead in line of the outer ring that the axis of described prefabricated pile 2 is formed with soil cement.
As in figure 2 it is shown, the construction of the large size prefabricated building enclosure of a kind of deep basal pit, comprise the steps:
A. all-hydraulic drill is in place: peg positions, and all-hydraulic drill centering is in place；
B. drilling and forming hole: start all-hydraulic drill, auger stem is drilled down into desired depth along leading truck, promotes auger and bores, and in desired depth, soil all takes out；
C. continue to creep into, mud jacking: again descend auger stem to desired depth, creep into while high pressure spray jetting, serosity are gentle；High-pressure injection cutting soil, makes aperture under desired depth increase；Become soil cement by auger stem Stirring water, serosity with the soil body, creep into projected depth, promote auger stem, become cement earth pile；
D. all-hydraulic drill displacement: carry out next root composite pile pore-forming operation；
E. pile extension platform is in place: pile extension platform is connected with pedrail crane, and mobile pedrail crane makes pile extension platform centering in place；
F. pile follower: pedrail crane hangs first segment prefabricated pile, and prefabricated pile top exceeds pile extension platform, reserved pile extension work surface, by pile extension platform fixture locking prefabricated pile；
G. pile extension, put stake: pedrail crane lifting second section prefabricated pile above first segment prefabricated pile, machinery pile extension after open pile extension platform fixture, prefabricated pile by gravity sink；
H. Pile feeder and vibration hammer are connected；When prefabricated pile leans on gravity to sink, pile extension platform fixture locking prefabricated pile, prefabricated pile top is sequentially connected with Pile feeder and vibration hammer；
I. vibrate piling: Vibration on Start-up hydraulic means, prefabricated pile is depressed into projected depth；
J. stake operation under next root prefabricated pile is carried out；
K. rotary churning pile between the stake of injection composite pile or mixing pile.
Further, desired depth described in step b is determined according to test and geologic prospect report, and both having prevented boring desired depth collapse hole, after ensureing again press-in prefabricated pile, soil cement lifting height is less than desired depth.
Further, creep into speed described in and height sprays power and determines according to test and geologic prospect report, it is ensured that serosity and soil are sufficiently mixed, and form homogenizing soil cement；Ensure that soil cement drilling diameter is slightly larger than drilling diameter in the desired depth of top, is engaged larger with rotary churning pile.
Further, described prefabricated pile cross sectional shape first-selection rectangle, sectional dimension is 500 × 500mm～1200 × 1200mm, it is also possible to for I-shaped, circular, trapezoidal etc..
Further, described prefabricated pile length is 10m～40m, is divided at most 3 joints, and often joint length is not preferably greater than 15m.
Instant invention overcomes the feature not being suitable for the stratum such as sandy gravel, drift sand that tradition pile sinking mode exists, it is shown that superiority greatly.Pile-forming speed is fast, and pile quality is reliable, and efficiency is high, and noise is low, circulates without mud, is not limited by subsoil water.Serosity configures in advance, and formed soil cement uniformity high parameters index controllability is strong.Can be widely applied to the pile foundation of civil construction project, apply also for the fender post of deep-foundation pit engineering, water-stop curtain etc..Be conducive to promoting the prefabricated industrialized development of Urban Underground Space Excavation.
The specific embodiment of the present invention is described in conjunction with accompanying drawing 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, those skilled in the art need not pay various amendments or deformation that creative work can make still within protection scope of the present invention.
Claims (10)
1. the large size prefabricated building enclosure of deep basal pit, it is characterized in that, including composite pile with between adjacent composite pile and carry out the rotary churning pile or the mixing pile that are engaged with composite pile, described composite pile includes a prefabricated pile, and it being filled in the soil cement of prefabricated pile outer ring, described soil cement and prefabricated pile are monolithically fabricated a cylindrical composite pile structure.
2. the large size prefabricated building enclosure of deep basal pit as claimed in claim 1, it is characterised in that described soil cement is engaged guarantee sealing with rotary churning pile between composite pile or mixing pile.
3. the large size prefabricated building enclosure of deep basal pit as claimed in claim 1, it is characterised in that described rotary churning pile or mixing pile axis are compared with composite pile axis, and rotary churning pile or mixing pile axis are partial to outside foundation ditch.
4. the large size prefabricated building enclosure of deep basal pit as claimed in claim 1, it is characterised in that the cross section of described prefabricated pile is rectangle, I-shaped, circular or trapezoidal.
5. the large size prefabricated building enclosure of deep basal pit as claimed in claim 1, it is characterised in that the dead in line of the outer ring that the axis of described prefabricated pile is formed with soil cement.
6. the construction method of the large size prefabricated building enclosure of deep basal pit, it is characterised in that comprise the steps:
A. all-hydraulic drill is in place: peg positions, and all-hydraulic drill centering is in place；
B. drilling and forming hole: start all-hydraulic drill, auger stem is drilled down into desired depth along leading truck, promotes auger stem, is all taken out by soil in desired depth；
C. continue to creep into, whitewash: again descend auger stem to desired depth, creep into while high pressure spray jetting, serosity, gas, high-pressure injection cutting soil so that aperture below desired depth increases；Rotated by auger stem, the soil body of mixing water, serosity and cutting, form soil cement, creep into projected depth, promote auger stem, become cement earth pile；
D. all-hydraulic drill displacement: carry out next root composite pile pore-forming operation；
E. pile extension platform is in place: pile extension platform is connected with pedrail crane, and mobile pedrail crane makes pile extension platform centering in place；
F. pile follower: pedrail crane hangs first segment prefabricated pile, and prefabricated pile top exceeds pile extension platform, reserved pile extension work surface, fixing prefabricated pile；
G. pile extension, put stake: pedrail crane lifting second section prefabricated pile above first segment prefabricated pile, machinery pile extension after open pile extension platform locking cylinder, prefabricated pile by gravity sink；
H. Pile feeder and vibration hammer are connected；When prefabricated pile leans on gravity to sink, pile extension platform oil cylinder locking, it is sequentially connected with Pile feeder and vibration hammer；
I. vibrate piling: Vibration on Start-up hydraulic means, prefabricated pile is depressed into projected depth；
J. stake operation under next root prefabricated pile is carried out；
K. rotary churning pile between the stake of injection composite pile or mixing pile.
7. the construction method of the large size prefabricated building enclosure of a kind of deep basal pit as claimed in claim 6, it is characterized in that, desired depth described in step b is determined according to test and geologic prospect report, both having prevented boring desired depth collapse hole, after ensureing again press-in prefabricated pile, soil cement lifting height is less than desired depth.
8. the construction method of the large size prefabricated building enclosure of a kind of deep basal pit as claimed in claim 6, it is characterized in that, in step c the height creeping into speed and high-pressure injection of auger stem spray power according to test and geologic prospect report determine, it is ensured that serosity and soil are sufficiently mixed, formed homogenizing soil cement；Ensure that soil cement drilling diameter is slightly larger than drilling diameter in the desired depth of top, is engaged larger with rotary churning pile.
9. the construction method of the large size prefabricated building enclosure of a kind of deep basal pit as claimed in claim 6, it is characterised in that the rotary churning pile described in step k is by high pressure spray jetting, soil, serosity, cutting soil, forms cement earth pile.
10. the construction method of the large size prefabricated building enclosure of a kind of deep basal pit as claimed in claim 6, it is characterised in that the while that the mixing pile described in step k being by drilling tool cutting soil, injects serosity, and drilling tool stirs the soil body and serosity, the cement earth pile of formation.
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| CN201610111348.7A CN105714832B (en) | 2016-02-29 | 2016-02-29 | A kind of large size prefabricated building enclosure of deep basal pit and construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106894418A (en) * | 2017-02-28 | 2017-06-27 | 济南轨道交通集团有限公司 | A kind of metalling plants the running pulp administering method of prefabricated pile |
| CN107460882A (en) * | 2017-06-20 | 2017-12-12 | 中冶天工集团有限公司 | A kind of retaining piles construction method of deep basal pit closing sealing |
| CN111042107A (en) * | 2019-12-25 | 2020-04-21 | 济南轨道交通集团有限公司 | Large-size precast pile enclosure construction system and construction method |
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| CN107460882B (en) * | 2017-06-20 | 2019-11-26 | 中冶天工集团有限公司 | A kind of retaining piles construction method of deep basal pit closing sealing |
| CN111042107A (en) * | 2019-12-25 | 2020-04-21 | 济南轨道交通集团有限公司 | Large-size precast pile enclosure construction system and construction method |
| CN111042107B (en) * | 2019-12-25 | 2021-06-29 | 济南轨道交通集团有限公司 | Large-size precast pile enclosure construction system and construction method |
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| CN105714832B (en) | 2017-09-26 |
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