CN105672329A - Deep foundation pit large-size prefabricated envelop enclosure and construction method - Google Patents
Deep foundation pit large-size prefabricated envelop enclosure and construction method Download PDFInfo
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- CN105672329A CN105672329A CN201610112270.0A CN201610112270A CN105672329A CN 105672329 A CN105672329 A CN 105672329A CN 201610112270 A CN201610112270 A CN 201610112270A CN 105672329 A CN105672329 A CN 105672329A
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/50—Piles comprising both precast concrete portions and concrete portions cast in situ
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a deep foundation pit large-size prefabricated envelop enclosure and a construction method. The deep foundation pit large-size prefabricated envelop enclosure comprises composite piles, and jet grouting piles or stirring piles located between the adjacent composite piles and engaged with the composite piles. Each composite pile comprises a prefabricated pile, and cement soil arranged on the outer circle of the prefabricated pile in a filling manner, wherein a cylindrical composite pile structure is integrally formed by the cement soil and the prefabricated piles. The envelope enclosure has the double functions of soil blocking and water stopping. The soil blocking function is achieved through the composite piles, holes formed in the composite piles are circular, the prefabricated piles are planted in the holes, and gaps are filled with the cement soil. The water stopping function is achieved in the manner that the cement soil is engaged with the jet grouting piles or the stirring piles between the adjacent composite piles. The prefabricated piles in a pile foundation project are introduced into the envelop enclosure in the deep foundation pit project, displacement piles are changed into low displacement piles, and the applicability of the prefabricated piles to a stratum is improved; the pile manufacturing and pile forming quality is guaranteed, the prefabricated piles can smoothly reach the designed depth, and pile intersecting is avoided; and pile enclosing and water stopping are combined.
Description
Technical field
The present invention relates to construction engineering technical field, particularly relate to a kind of promote prefabricated industrialization management to develop in deep foundation pit support field building enclosure and constructional method.
Background technology
Deep foundation pit of construction engineering building enclosure generally adopts cast-in place pile, outside injection rotary churning pile or mixing pile sealing. Along with deep-foundation pit engineering is gradually to the development of dark, general orientation, building enclosure is inevitable to large size development, owing to construction technology own and size and the degree of depth strengthen, causes that building enclosure construction quality is poor, speed of application is slow.
Premculded pile is generally used in building pile foundation engineering, existing process for sinking is static pressure and hammering two kinds by force mainly, these two kinds of techniques belong to soil compaction stake, downtown area intensive building should not be used for, close on road and underground utilities intersect various area, because of the exclusion amount of the soil body is big during piling, thus produce earth horizontal displacement and vertical translation (protuberance), particularly such as hard folder soil layer or rounded gravel layer during piling, pile top is difficult to enter design absolute altitude, cause the serious damage of stake, delay the engineering time and cause loss economically, and seriously affect surrounding buildings thing, road, the safety of structures.
In order to solve this difficult problem, one of traditional method cuts stake, is namely cut out on the top of stake when stake is not gone down, the defect of this kind of method existence had both wasted starting material, destroy again original result and the prestress of stake, seriously affect the intensity of pile foundation, it is difficult to the quality of buildings is protected; Two is first carry out drawing hole before pile sinking, and the defect of this kind of method existence is in ground water table district higher, especially sand-pebble layer, it is easy to collapse hole, it is very difficult to ensure 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 constructional method.
The technical solution used in the present invention is as follows:
A kind of large size prefabricated building enclosure of deep basal pit, comprise compound pile and carry out the rotary churning pile that is engaged or mixing pile between adjacent compound pile and with compound pile, described compound pile comprises a premculded pile, and it being filled in the cement-earth of premculded pile outer ring, described cement-earth and premculded pile entirety form a cylindrical composite pile structure.
Further, described rotary churning pile is by high pressure spraying water, soil, slurries, cutting soil, forms cement earth pile; The while that described mixing pile being by drilling tool cutting soil, inject slurries, stir the soil body and slurries, the cement earth pile of formation;
Further, described cement-earth is engaged with rotary churning pile between compound pile or mixing pile and ensures sealing.
Further, described all hydraulic operated 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; Become bore diaThe degree of depth can reach more than 30 meters.
Further, described cement-earth stirs configuration in advance, is carried by backstage squeezing unit;
Further, described cement grout material comprises cement, the good soil of selection, additive and admixture.
Further, described slurry degree remains between 160mm～240mm;
Further, described slurries setting time remains between 2h～4h;
Further, described slurries solidify rear unconfined compression strength and are not less than 1MPa;
Further, described slurries solidify rear seepage-resistant grade and are not less than P6;
Further, described cement can adopt ordinary Portland cement, Portland blast furnace slag cement or pulverized fuel ash cement, and wherein cement mixing content is 18%～25%;
Further, described good soil adopts the powder soil of site operation discharge, cohesive soil or sand;
Further, described additive adopts aggregate chips or flyash;
Further, admixture adopts accelerating chemicals.
Further, between premculded pile, rotary churning pile or mixing pile be engageds size with compound pile and determine by design, and rotary churning pile or mixing pile center are compared with compound pile center, and outside deflection base is cheated, under ensureing lateral earth pressure effect outside, occlusal surface is pressed, and stagnant water effect is good.
Further, the cross section of described premculded pile is rectangle, I-shaped, circular or trapezoidal.
Further, the axis of described premculded pile overlaps with the axis of the outer ring that cement-earth is formed.
A constructional method for the large size prefabricated building enclosure of deep basal pit, comprises the steps:
A. all hydraulic operated drill is in place: peg is located, and all hydraulic operated drill centering is in place;
B. drilling and forming hole: start all hydraulic operated drill, spiral drill pipe creeps into downwards to the design degree of depth along guide frame;
C. carrying the pressure of the drill slurry: open mud jacking pump, limit promotes spiral drill pipe, limit press-in cement grout; Cement grout is full of room for promotion, can ensure that hole wall is stablized.
D. all hydraulic operated drill displacement: carry out next root premculded pile and become hole 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 premculded pile, premculded pile top exceeds pile extension platform, and reserved pile extension working face, by pile extension platform fixture locking first segment premculded pile;
G. pile extension, put stake: pedrail crane lifting Section of two premculded pile to first segment premculded pile above, by being mechanically connected two joint premculded piles, then open pile extension platform fixture, transfer premculded pile;
H. Pile feeder and vibration hammer is connected; When premculded pile leans on gravity to sink, pile extension platform fixture locking premculded pile, premculded pile top connects Pile feeder and vibration hammer successively;
I. vibrate piling: Vibration on Start-up hydraulic efficiency plant, premculded pile is depressed into the design degree of depth;
J. stake operation under next root premculded pile is carried out;
K. rotary churning pile or mixing pile between injection stake.
Described construction, described mud jacking speed is determined according to test in place, ensures to promote slurries in spiral drill pipe process and is full of the rear borehole space of drilling rod lifting, has antiseepage and anti-collapse hole effect.
Described construction, described mud jacking amount is determined according to on-the-spot engineering geological condition and bury of groundwater situation, it is contemplated that after premculded pile inserts, and slurries extrude space with soil at both sides upward, it is determined that slurries are full ratio in the borehole.
Described construction, the first-selected rectangle of described premculded pile cross-sectional shape, concrete size calculates according to the excavation of foundation pit degree of depth and the stage of use load to be determined, cross section size can be 500 × 500mm～1200 × 1200mm, it is also possible to for I-shaped, circular, trapezoidal etc.
Described premculded pile length is 10m～40m, is divided at most 3 joints, often saves length and should not be greater than 15m.
Further, described rotary churning pile is by high pressure spraying water, soil, slurries, cutting soil, forms cement earth pile; The while that described mixing pile being by drilling tool cutting soil, inject slurries, stir the soil body and slurries, the cement earth pile of formation;
The useful effect of the present invention is as follows:
1, pile-forming speed is fast, and pile quality is reliable, and efficiency height, noise is low, without mud circulation, does not limit by underground water.
2, overcome the feature not being suitable for the stratum such as sandy gravel, drift sand that tradition pile sinking mode exists, show great superiority.
3, slurries configure in advance, are formed cement grout homogeneity height, and parameters index controllability is strong.
4, the pile foundation that can be widely used in civil construction project, also can be applicable to the fender post of deep-foundation pit engineering, water-stop curtain etc.
5, the prefabricated industrialized development of urban underground space exploitation is conducive to promoting.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, it is briefly described to the accompanying drawing used required in embodiment or description of the prior art 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 prerequisite 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 floor plan schematic diagram of deep basal pit;
Fig. 2 is deep basal pit large size prefabricated compound pile construction longitudinal section schematic diagram.
In figure: 1 cement-earth, 2 premculded piles, 3 rotary churning piles or mixing pile.
Embodiment
Below in conjunction with accompanying drawing, the present invention continued detailed explanation:
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 constructional method. Building enclosure has gear soil and sealing dual function; Gear soil effect is realized by a kind of compound pile, and compound pile Cheng Kongwei is circular, and hole is implanted into premculded pile, secretion cement-earth; Sealing effect is engaged realization by rotary churning pile between cement-earth with compound pile or mixing pile. Premculded pile in pile foundation engineering is incorporated in the building enclosure in deep-foundation pit engineering by this invention, and change soil compaction stake is low soil compaction stake, expands premculded pile stratum suitability; Ensure that stake processed and pile quality, premculded pile can arrive the design degree of depth smoothly, avoids cutting stake; Fender post and sealing combine. Below in conjunction with accompanying drawing, the present invention is described in detail:
As shown in Figure 1, the large size prefabricated building enclosure of deep basal pit, comprise compound pile and carry out the rotary churning pile that is engaged or mixing pile 3 between adjacent compound pile and with compound pile, described compound pile comprises a premculded pile 2, and it being filled in the cement-earth 1 of premculded pile outer ring, cement-earth 1 forms a cylindrical composite pile structure with premculded pile 2 entirety.
Further, cement-earth 1 is engaged with rotary churning pile between compound pile or mixing pile and ensures sealing.
Further, described all hydraulic operated 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; Become bore diaThe degree of depth can reach more than 30 meters.
Further, cement-earth 1 stirs configuration in advance, is carried by backstage squeezing unit;
Further, cement-earth 1 slurry material comprise cement, the good soil of selection, additive and admixture, described slurry degree remains between 160mm～240mm; Slurries setting time remains between 2h～4h; Slurries solidify rear unconfined compression strength and are not less than 1MPa; Slurries solidify rear seepage-resistant grade and are not less than P6;
The technician of this area is according to above-mentioned four parameters, and the test through routine can obtain the ratio range of each component of cement grout material, therefore, does not carry out detailed proportioning explanation at this.
Further, cement can adopt ordinary Portland cement, Portland blast furnace slag cement or pulverized fuel ash cement, and cement mixing content is 18%～25%;
Further, powder soil, cohesive soil or sand that good soil employing site operation is discharged;
Further, additive adopts aggregate chips or flyash;
Further, admixture adopts accelerating chemicals.
Further, between premculded pile, rotary churning pile or mixing pile be engageds size with compound pile and determine by design, and rotary churning pile or mixing pile center are compared with compound pile center, and outside deflection base is cheated, under ensureing lateral earth pressure effect outside, occlusal surface is pressed, and stagnant water effect is good.
Further, the cross section of described premculded pile is rectangle, I-shaped, circular or trapezoidal.
Further, the axis of described premculded pile overlaps with the axis of the outer ring that cement-earth is formed.
As shown in Figure 2, the construction of the large size prefabricated building enclosure of a kind of deep basal pit, comprises the steps:
A. all hydraulic operated drill is in place: peg is located, and all hydraulic operated drill centering is in place;
B. drilling and forming hole: start all hydraulic operated drill, spiral drill pipe creeps into downwards to the design degree of depth along guide frame;
C. carrying the pressure of the drill slurry: open mud jacking pump, limit promotes spiral drill pipe, limit press-in cement-earth;
D. all hydraulic operated drill displacement: carry out next root premculded pile and become hole 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 premculded pile, premculded pile top exceeds pile extension platform, and reserved pile extension working face, by pile extension platform fixture locking premculded pile;
G. pile extension, put stake: pedrail crane lifting Section two premculded pile to first segment premculded pile above, machinery pile extension after open pile extension platform locking cylinder, premculded pile by gravity sinking;
H. Pile feeder and vibration hammer is connected; When premculded pile leans on gravity to sink, pile extension platform fixture locking premculded pile, premculded pile top connects Pile feeder and vibration hammer successively;
I. vibrate piling: Vibration on Start-up hydraulic efficiency plant, premculded pile is depressed into the design degree of depth;
J. stake operation under next root premculded pile is carried out;
K. injection rotary churning pile or mixing pile.
Described construction, described mud jacking speed is determined according to test in place, ensures to carry slurries in drill-through journey and is full of the rear borehole space of drilling rod lifting, has antiseepage and anti-collapse hole effect.
Described construction, described mud jacking amount is determined according to test in place, it is contemplated that after premculded pile inserts, and slurries extrude space with soil at both sides upward, it is determined that slurries are full ratio in the borehole.
Described construction, described premculded pile cross-sectional shape first-selection is square, and cross section is of a size of 500 × 500mm～1200 × 1200mm, it is also possible to for I-shaped, circular, trapezoidal etc.
Described premculded pile length is 10m～40m, is divided at most 3 joints, often saves length and is not more 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, show great superiority. Pile-forming speed is fast, and pile quality is reliable, and efficiency height, noise is low, without mud circulation, does not limit by underground water. Slurries configure in advance, are formed cement-earth homogeneity high parameters index controllability strong. The pile foundation that can be widely used in civil construction project, also can be applicable to the fender post of deep-foundation pit engineering, water-stop curtain etc. Be conducive to promoting the prefabricated industrialized development of urban underground space exploitation.
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 the 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 (10)
1. the large size prefabricated building enclosure of deep basal pit, it is characterized in that: comprise compound pile and carry out the rotary churning pile that is engaged or mixing pile between adjacent compound pile and with compound pile, described compound pile comprises a premculded pile, and it being filled in the cement-earth of premculded pile outer ring, described cement-earth and premculded pile entirety form 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 rotary churning pile or mixing pile axis are compared with compound pile axis, and outside cheated by rotary churning pile or mixing pile axis deflection base.
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 carry out being engaged realizing sealing with the cement-earth part of compound pile.
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 premculded 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 axis of described premculded pile overlaps with the axis of the outer ring that cement-earth is formed.
6. the large size prefabricated building enclosure of deep basal pit as claimed in claim 1, it is characterised in that: further, described cement-earth stirs configuration in advance, is carried by backstage squeezing unit; Cement grout material comprises cement, the good soil of selection, additive and admixture; Wherein, slurry degree remains between 160mm～240mm; Slurries setting time remains between 2h～4h; Slurries solidify rear unconfined compression strength and are not less than 1MPa; Slurries solidify rear seepage-resistant grade and are not less than P6.
7. the constructional method of the large size prefabricated building enclosure of deep basal pit, it is characterised in that, comprise the steps:
A. all hydraulic operated drill is in place: peg is located, and all hydraulic operated drill centering is in place;
B. drilling and forming hole: start all hydraulic operated drill, spiral drill pipe creeps into downwards to the design degree of depth along guide frame;
C. carrying the pressure of the drill slurry: open mud jacking pump, limit promotes spiral drill pipe, limit press-in cement grout; Cement grout is full of room for promotion, ensures that hole wall is stablized;
D. all hydraulic operated drill displacement: carry out next root premculded pile and become hole 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 premculded pile, premculded pile top exceeds pile extension platform, and reserved pile extension working face, by pile extension platform fixture locking first segment premculded pile;
G. pile extension, put stake: pedrail crane lifting Section of two premculded pile to first segment premculded pile above, by being mechanically connected two joint premculded piles, then open pile extension platform fixture, transfer premculded pile;
H. Pile feeder and vibration hammer is connected; When premculded pile leans on gravity to sink, pile extension platform fixture locking premculded pile, premculded pile top connects Pile feeder and vibration hammer successively;
I. vibrate piling: Vibration on Start-up hydraulic efficiency plant, premculded pile is depressed into the design degree of depth;
J. stake operation under next root premculded pile is carried out;
K. rotary churning pile or mixing pile between injection compound pile.
8. constructional method as claimed in claim 7, it is characterised in that, the determination mode of described mud jacking speed is for being as the criterion to ensure to put forward the full drilling rod rear borehole space of lifting of slurries in drill-through journey.
9. constructional method as claimed in claim 7, it is characterised in that, determining according to test in place of described mud jacking amount, it is contemplated that after premculded pile inserts, slurries extrude space with soil at both sides upward, it is determined that slurries are full ratio in the borehole.
10. constructional method as claimed in claim 7, it is characterised in that, described premculded pile length is 10m～40m, is divided at most 3 joints, often saves length and is not more than 15m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610112270.0A CN105672329B (en) | 2016-02-29 | 2016-02-29 | The large size prefabricated building enclosure of deep basal pit and construction method |
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| CN201610112270.0A CN105672329B (en) | 2016-02-29 | 2016-02-29 | The large size prefabricated building enclosure of deep basal pit and construction method |
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| CN105672329B CN105672329B (en) | 2017-12-15 |
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| 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 |
| CN109024557A (en) * | 2018-08-09 | 2018-12-18 | 中国兵器工业北方勘察设计研究院有限公司 | A kind of drill-pouring prefabricated pile and construction method |
| CN112323560A (en) * | 2020-11-19 | 2021-02-05 | 中电建路桥集团有限公司 | Roadbed construction settlement control system and method under complex soft foundation environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109024557A (en) * | 2018-08-09 | 2018-12-18 | 中国兵器工业北方勘察设计研究院有限公司 | A kind of drill-pouring prefabricated pile and construction method |
| CN112323560A (en) * | 2020-11-19 | 2021-02-05 | 中电建路桥集团有限公司 | Roadbed construction settlement control system and method under complex soft foundation environment |
| CN112323560B (en) * | 2020-11-19 | 2022-03-01 | 中电建路桥集团有限公司 | Roadbed construction settlement control system in complex soft foundation environment |
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| Publication number | Publication date |
|---|---|
| CN105672329B (en) | 2017-12-15 |
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