CN107700497A - A kind of building basement pattern foundation pit supporting structure and earth excavation construction method - Google Patents
A kind of building basement pattern foundation pit supporting structure and earth excavation construction method Download PDFInfo
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- CN107700497A CN107700497A CN201710915861.6A CN201710915861A CN107700497A CN 107700497 A CN107700497 A CN 107700497A CN 201710915861 A CN201710915861 A CN 201710915861A CN 107700497 A CN107700497 A CN 107700497A
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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
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/40—Miscellaneous comprising stabilising elements
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The present invention relates to a kind of building basement pattern foundation pit supporting structure and earth excavation construction method, comprise the following steps：S1：Place is levelling, and sideline, construction axis, mixing pile stake position are put in side；S2：Mixing pile construction；S3：Prestressing pipe pile construction；S4：Foundation ditch top row water system;S5：Excavate the earthwork；S6：Bottom of foundation ditch drainage system is set.Sealing or draining device, such as water-stop curtain, sump are provided with because building is provided in below underground water, therefore in foundation ditch the week side of boss；Allow the obstruction of surface water, dash coagulation soil matrix mainly is set on side slope top, top of the slope is slightly higher, allows surface water to be discharged in the gutter beyond foundation ditch, while cure process is done on top of the slope ground, prevents surface water and rainwater from penetrating into side slope retaining wall；Temporary drain and sump then are set by design requirement along foundation ditch surrounding in foundation ditch, drain the water of foundation ditch in time；Avoid the structural strength of surface water or influence on groundwater foundation ditch.
Description
Technical field
The present invention relates to a kind of construction techniques, more particularly to a kind of building basement pattern foundation pit supporting structure is applied with earth excavation
Work method.
Background technology
With the popularization of the Larger Engineering Projects with basement, pattern foundation pit supporting structure is with earth excavation special construction plan in band
Have in the Larger Engineering Projects of basement and play an important role.
If certain engineering project B1 is 6628 square metres, 11 layers are shared on the ground, area is 46720 square metres, extrusion
Using PHC-AB500 type hammer blow tubular piles；Deep Foundation Pit soil layer from top to bottom sequentially includes：Artificial earth fill (thickness 2.8-3.4m),
Muck soil (thickness 2.2-5.5m)；The underground water in place is pore ground water, mainly by Atmospheric precipitation and water-bearing layer side seepage
Supply, groundwater level is higher, and nearer apart from earth's surface, if building structure may result in into foundation ditch above underground water
It is unstable；If by building structure below underground water, underground water it is long-term wash away under, still can influence the structure of building
Intensity.
Here, we provide and a kind of alleviate shadow of the underground water to building foundation pit by the way of cement mixing pile is kept out
Ring.
The content of the invention
It is an object of the invention to provide one kind to build underground pile base construction method.
The present invention above-mentioned technical purpose technical scheme is that：A kind of building basement foundation ditch branch
Shield and earth excavation construction method, comprise the following steps：
S1：Place is levelling, and sideline, construction axis, mixing pile stake position are put in side；
S2：Mixing pile construction；
S3：Prestressing pipe pile construction；
S4：Foundation ditch top row water system
S5：Excavate the earthwork；
S6：Bottom of foundation ditch drainage system is set.
As preferred, the S2 comprises the following steps：
S21：Fixed, core stake position；
S22：Telephone-moving aligns；
S23：Prepare cement mortar；
S24：Whitewashing stirring is sunk；
S25：Whitewashing stirring lifting；
S26：Repeat whitewashing stirring and sink down into an end；
S27：Repeat whitewashing stirring lifting；
S28：Stop starching；
S29：Stirring-head is lifted to earth's surface；
S30：Stake processed terminates, and moves to next position.
As preferred, the cement mortar prepared in the S23 include the Portland cement that strength grade is 32.5R and
Water, ratio of mud 0.45-0.5.
As preferred, the S5 comprises the following steps：
S51：The earthwork is successively excavated to basement bottom board bottom, deep 4m；
S52：Excavate cushion cap position, deep 1.5m；
S53：Excavate elevator position, deep 2m；
S54：Basement bottom board absolute altitude is backfilled to after completing elevator, cushion cap and central pile bearing platform construction；
S55：Basement edge cushion cap local excavation, deep 1m；
S56：Basement bottom board absolute altitude is backfilled to after completing bearing platform construction；
S57：Basement bottom board is constructed；
S58:Foundation pit construction terminates.
As preferred, the S4 comprises the following steps：
S41：Build intercepting ditch in hole top periphery；
S42：Foundation ditch top periphery sets water-stop curtain；
Wherein, timely pump drainage hole internal water accumulation, base are answered after hole top periphery build intercepting ditch, every layer of earth excavation before excavation of foundation pit
Hole is overall when being excavated to basement bottom board, and sump is set by spacing 35-40m, and the pump drainage that will catchment is discharged into after precipitation to intercepting ditch
Municipal sewer.
Preferably, before S1 construction, wide 0.9-1.0m is cleared up according to design, deep 1-2m construction guide groove,
Exclude the underground obstacle in the boundary of works area that the enclosure of construction guide groove is formed.
Formed preferably, water-stop curtain is set up by cement mixing method, the long 500-650mm of stake diameter, the lap of splice is
130-150mm, a length of 8-10m of stake.
Preferably, being provided with clasp between adjacent cement mixing method, the clasp is included from soil cement
Mixing pile side wall stretches out the arc hasp to be formed and the rubber water-proof bar that is arranged on arc hasp.
In summary, the invention has the advantages that：
(1) because building is provided in below underground water, therefore foundation ditch the week side of boss is provided with sealing or draining device, such as
Water-stop curtain, sump etc.；Allow the obstruction of surface water, dash coagulation soil matrix mainly is set on side slope top, top of the slope is slightly higher, allows ground
Table water is discharged in the gutter beyond foundation ditch, while cure process is done on top of the slope ground, prevents surface water and rainwater from penetrating into side slope
In retaining wall；Temporary drain and sump then are set by design requirement along foundation ditch surrounding in foundation ditch, drain the water of foundation ditch in time；Keep away
Exempt from the structural strength of surface water or influence on groundwater foundation ditch.
(2) water-stop curtain is spliced by some mixing piles, and cement is used as adhesive backers, within the specific limits, is added
Cement in concrete is more, concrete all the more consolidation and porosity is smaller, and aperture is also smaller, and slump is low, therefore by this
The mixing pile permeability rate that kind of concrete pours into is low and Stability Analysis of Structures.
(3) it is mixed into cement therein and uses the portland cement that strength grade is 32.5R, this portland cement
Self structure intensity is higher, and the moisture being added thereto is less, and in the process of setting of cement, the moisture evaporation in cement is in cement
Surface forms small hole；Fewer moisture is added middle to a certain degree, the hole of formation is smaller.
(4) clasp set between adjacent mixing pile is advantageous to the fixation between two mixing piles, mixing pile side wall
On be provided with the hasp of arc, two neighboring mixing pile rely between hasp clamping, situations such as avoiding misplacing；And in arc
Rubber water-proof bar is provided with the face that the hasp of shape mutually abuts, rubber water-proof strip adoption is hydroscopic high-molecular resin, this kind of
Material water-swellable, the gap between mixing pile can be blocked by being disposed between adjacent mixing pile, be further functioned as anti-
The effect of water；Secondly underground water has certain impulsive force to mixing pile, after washing away for a long time, may result in mixing pile inclination etc.
The appearance of situation, but after mixing pile water-swellable, make closely to abut between mixing pile, it is had underground water stronger
Resistance.
Brief description of the drawings
Fig. 1 is integral construction flow chart in embodiment；
Fig. 2 is S2 steps construction process figure in embodiment；
Fig. 3 is S4 steps construction process figure in embodiment；
Fig. 4 is clasp structural representation in embodiment；
Fig. 5 is S5 steps construction process figure in embodiment.
In figure, 11, arc hasp；12nd, rubber water-proof bar.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
This specific embodiment is only explanation of the invention, and it is not limitation of the present invention, people in the art
Member can make the modification of no creative contribution to the present embodiment as needed after this specification is read, but as long as at this
All protected in the right of invention by Patent Law.
Embodiment：
A kind of building basement pattern foundation pit supporting structure and earth excavation construction method, as shown in figure 1, mainly including following 6 main steps
Suddenly：
S1：Place is levelling, and sideline, construction axis, mixing pile stake position are put in side；
S2：Mixing pile construction；
S3：Prestressing pipe pile construction；
S4：Foundation ditch top row water system；
S5：Excavate the earthwork；
S6：Bottom of foundation ditch drainage system is set.
Before practice of construction, original situation of the road around foundation ditch before excavation, pipeline need to be investigated, be recorded；
And draining, sealing and the dewatering measure of foundation ditch are carried out, in Excavation Process, foundation ditch sealing problem is kept a close eye on, is avoided out
The appearance of the problems such as existing leak, infiltration and piping.
Foundation ditch sideline is determined according to design, carries out Deep Mixing Piles Construction at first；It is first along Deep Mixing Piles Construction face
Clear out wide one 1m, deep 1-2m construction guide groove, the construction guide groove in the present embodiment is 1m, is construction model between guide groove of constructing
Enclose, using the underground obstacle in the technologies such as infrared acquisition discharge boundary of works area, including building extrusion, stone etc., then carry out
Mixing pile construction；After the completion of mixing pile, the construction in tube pile construction and gutter is proceeded by, then begins to excavation of foundation pit, until
Excavation of foundation pit is completed.
As shown in Fig. 2 S2：The step of mixing pile construction, mainly includes：
S21：Fixed, core stake position；
S22：Telephone-moving aligns；
S23：Prepare cement mortar；
S24：Whitewashing stirring is sunk；
S25：Whitewashing stirring lifting；
S26：Repeat whitewashing stirring and sink down into an end；
S27：Repeat whitewashing stirring lifting；
S28：Stop starching；
S29：Stirring-head is lifted to earth's surface；
S30：Stake processed terminates, and moves to next position.
Prepare cement mortar：
Clean container is taken, adds Portland cement thereto, the strength grade of the cement is 32.5R, then is added thereto
A certain amount of clear water, make mixed water in products.The ratio of mud is 0.45-0.5, and the ratio of mud in the present embodiment is 0.45；Water
Mud incorporation is 80 kilograms of cement of every meter of mixing pile.
Construction machinery uses deep-layer stirring pile foundation, and drill bit uses the cross bits of φ 168 of address brill；It is well prepared in advance to stir
Stake, then the setting-out on the mixing pile to be intubated are mixed, stake machine is in place afterwards, leveling, starts to punch after centering, using cement mortar conduct
Pore-forming mud, squeeze into a projected depth.Finally using the hoist engine being arranged on mixing pile machine the steel tube suspendings of φ 114 processed
After rising, pipe is received in into well and on the holes of φ 168 full of cement mortar, completes intubation task；Table 1 is main technique in construction
Parameter.
Table 1：
| Project | Parameter | Remarks |
| Subsidence velocity (m/min) | 1.0~1.3 | IIth, III gear |
| Lift speed (m/min) | 0.5~0.8 | Ith, II gear |
| Mixing speed (r/min) | 30~50 | Ith, II gear |
| Whitewashing number (secondary) | 4 | |
| Stir number (secondary) | 4 | |
| Grout outlet is pumped (MPa) | 0.4~0.6 | |
| Cement mixed weight | Every meter of stake mixes 80 kilograms |
In prestressing pipe pile construction, pile tube is the concrete-pile for ensureing fabric structure intensity, is made using piling machine
It is plugged in foundation ditch.
As shown in Fig. 2 S4：The step of foundation ditch top row water system, mainly includes：
S41：Build intercepting ditch in hole top periphery；
S42：Foundation ditch top periphery sets water-stop curtain.
Before excavation of foundation pit, gutter is set at top by design drawing requirement and smears pea gravel concreten shield top, prevents ground
Oozed under table water and rainwater etc. washes away to excavation slope, and sedimentation basin is set；Build and cut on hole top periphery before excavation of foundation pit
Ditch, after every layer of earth excavation, timely pump drainage hole internal water accumulation is answered, when foundation ditch is integrally excavated to basement bottom board, by spacing 35-
40m sets sump, and the water of sump is extracted into the gutter on hole top with suction pump, is discharged into after sedimentation basin precipitates to downcomer
Road.
Gutter and sump are arranged in beyond proposed building base side clear distance 0.4m, and draining furrow rim leaves Slope
Pin is no less than 0.3m.
Because foundation ditch excavation is relatively deep larger, and drawing is mostly layer of sand, is middle water penetration, water penetration is stronger, using deep water
Water-stop curtain of the soil mixing pile as foundation ditch, according to soil layer property and neighbouring construction experience, using double cement mixing method,
Stake footpath is 650mm, and the stake lap of splice is 150mm, and stake is long should to squeeze into the poor silty sand ground of water penetration, and 11m is most suitable.
As shown in figure 4, being provided with clasp between cement mixing method, clasp includes being arranged on Soil-cement
Arc hasp 11 in stake side wall, arc hasp 11 is provided with some on cement mixing method, is provided only with the present embodiment
Two, rubber water-proof bar 12 is provided with arc hasp, rubber water-proof bar 12 is made of hydroscopic high-molecular resin.When adjacent two
When individual cement mixing method is set up, arc hasp 11 cooperates, and the rubber water-proof bar 12 being arranged on arc hasp mutually supports
Connect, and abutting even closer after water-swellable is together, to play a part of sealing.
As shown in Fig. 2 S5：The step of excavating the earthwork mainly includes：
S51：The earthwork is successively excavated to basement bottom board bottom, deep 4m；
S52：Excavate cushion cap position, deep 1.5m；
S53：Excavate elevator position, deep 2m；
S54：Basement bottom board absolute altitude is backfilled to after completing elevator, cushion cap and central pile bearing platform construction；
S55：Basement edge cushion cap local excavation, deep 1m；
S56：Basement bottom board absolute altitude is backfilled to after completing bearing platform construction；
S57：Basement bottom board is constructed；
S58:Foundation pit construction terminates.
Stake age to be mixed, which reaches 28 days, to be started to excavate；First layer first is dug with 700 type hook machines, by 1:1 slope, first layer
Cutting depth is 2m, then digs the second layer earthwork with long-armed hook machine, by 1：1 slope, excavation arrive bottom cushion bottom.30 types of cushion cap position
Small hook machine is excavated, and long-armed hook machine is given in the earthwork.Earth excavation direction promotes from south to north, until excavation of foundation pit terminates.
Be unearthed ramp and the driving chute that is unearthed are reinforced with deep-mixed pile.
Earth excavation wants strict implement stage excavation, avoids sediment failure, and the position for having stake will set mark, indicate stake
Position and the absolute altitude of stake, close to supporting construction and engineering pile position, it is impossible to take mechanical shoveling, should be changed to manually cut the earth.Sternly
Prohibit hook machine collision engineering pile.
Elevator cushion cap base pit stand construction：After earth excavation is to bottom cushion bottom absolute altitude, held in elevator
Two row's mixing piles are made a call to as supporting in platform periphery, then excavate the elevator cushion cap earthwork with small hook machine.
Dug with large-scale hook machine to predetermined absolute altitude above 30cm, the remaining earthwork is used the small-sized hook machine of hand fit instead and cut the earth；Cubic metre of earth
Before excavation, ensure that mixing pile has reached intensity 70%.
It should not be collided during shoveling or injury of primary engineering pile, supporting construction, pumping equipment；Large-scale hook machine is cut the earth close to supporting
Structure and engineering pile position, it is changed to the small-sized hook machine of hand fit and cuts the earth；Once occurring tilting and ftractureing, to stop excavating at once.
Water level outside supporting construction, surrounding buildings or structures, foundation ditch is observed and monitored in pit earthwork construction, is avoided
There is water level beyond abnormal conditions such as warning values.
Earth excavation first selects one section exemplarily, after excavation to can ensure that deep pit monitor carries out full-face tunneling again.
In work progress, comprehensive detection should be carried out to foundation ditch, such as level of ground water, supporting construction deviational survey, top horizontal
Displacement, the surface subsidence of foundation ditch surrounding, periphery town road and underground utilities etc.；So as to understand the displacement of foundation ditch, sedimentation etc. in time
Situation of change, avoid the occurrence of the anomalies such as foundation ditch displacement is excessive, settling amount is excessive or pace of change is too fast.
Claims (8)
1. a kind of building basement pattern foundation pit supporting structure and earth excavation construction method, it is characterised in that comprise the following steps：
S1：Place is levelling, and sideline, construction axis, mixing pile stake position are put in side；
S2：Mixing pile construction；
S3：Prestressing pipe pile construction；
S4：Foundation ditch top row water system
S5：Excavate the earthwork；
S6：Bottom of foundation ditch drainage system is set.
2. a kind of building basement pattern foundation pit supporting structure according to claim 1 and earth excavation construction method, it is characterised in that：
The S2 comprises the following steps：
S21：Fixed, core stake position；
S22：Telephone-moving aligns；
S23：Prepare cement mortar；
S24：Whitewashing stirring is sunk；
S25：Whitewashing stirring lifting；
S26：Repeat whitewashing stirring and sink down into an end；
S27：Repeat whitewashing stirring lifting；
S28：Stop starching；
S29：Stirring-head is lifted to earth's surface；
S30：Stake processed terminates, and moves to next position.
3. a kind of building basement pattern foundation pit supporting structure according to claim 2 and earth excavation construction method, it is characterised in that：
The cement mortar prepared in the S23 includes the Portland cement and water that strength grade is 32.5R, ratio of mud 0.45-
0.5。
4. a kind of building basement pattern foundation pit supporting structure according to claim 1 and earth excavation construction method, it is characterised in that：
The S5 comprises the following steps：
S51：The earthwork is successively excavated to basement bottom board bottom, deep 4m；
S52：Excavate cushion cap position, deep 1.5m；
S53：Excavate elevator position, deep 2m；
S54：Basement bottom board absolute altitude is backfilled to after completing elevator, cushion cap and central pile bearing platform construction；
S55：Basement edge cushion cap local excavation, deep 1m；
S56：Basement bottom board absolute altitude is backfilled to after completing bearing platform construction；
S57：Basement bottom board is constructed；
S58:Foundation pit construction terminates.
5. a kind of building basement pattern foundation pit supporting structure according to claim 1 and earth excavation construction method, it is characterised in that：
The S4 comprises the following steps：
S41：Build intercepting ditch in hole top periphery；
S42：Foundation ditch top periphery sets water-stop curtain；
Wherein, timely pump drainage hole internal water accumulation, base are answered after hole top periphery build intercepting ditch, every layer of earth excavation before excavation of foundation pit
Hole is overall when being excavated to basement bottom board, and sump is set by spacing 35-40m, and the pump drainage that will catchment is discharged into after precipitation to intercepting ditch
Municipal sewer.
6. a kind of building basement pattern foundation pit supporting structure according to claim 1 and earth excavation construction method, it is characterised in that：
Before the S1 constructions, wide 0.9-1.0m is cleared up according to design, deep 1-2m construction guide groove, excludes construction guide groove enclosure shape
Into boundary of works area in underground obstacle.
7. a kind of building basement pattern foundation pit supporting structure according to claim 5 and earth excavation construction method, it is characterised in that：
Water-stop curtain is set up by cement mixing method and formed, stake diameter long 500-650mm, lap of splice 130-150mm, a length of 8- of stake
10m。
8. a kind of building basement pattern foundation pit supporting structure according to claim 6 and earth excavation construction method, it is characterised in that：
Clasp is provided between adjacent cement mixing method, the clasp includes stretching out from cement mixing method side wall
The arc hasp of formation and the rubber water-proof bar being arranged on arc hasp.
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| CN201710915861.6A CN107700497A (en) | 2017-09-29 | 2017-09-29 | A kind of building basement pattern foundation pit supporting structure and earth excavation construction method |
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| CN201710915861.6A CN107700497A (en) | 2017-09-29 | 2017-09-29 | A kind of building basement pattern foundation pit supporting structure and earth excavation construction method |
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| CN107700497A true CN107700497A (en) | 2018-02-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109056765A (en) * | 2018-07-20 | 2018-12-21 | 广东建邦兴业集团有限公司 | A kind of foundation ditch construction method of anti-collapse flood bubble |
| CN110295606A (en) * | 2019-07-05 | 2019-10-01 | 广州穗岩土木科技股份有限公司 | A kind of foundation pit interlocking pile water stop construction method |
| CN113529730A (en) * | 2021-07-28 | 2021-10-22 | 中建八局天津建设工程有限公司 | Construction method of foundation pit |
| CN113863076A (en) * | 2021-09-27 | 2021-12-31 | 中国一冶集团有限公司 | Construction method of sunken road under sandbar bridge |
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| CN105089061A (en) * | 2015-08-11 | 2015-11-25 | 泰兴市第一建筑安装工程有限公司 | Ultra-deep foundation pit supporting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105089061A (en) * | 2015-08-11 | 2015-11-25 | 泰兴市第一建筑安装工程有限公司 | Ultra-deep foundation pit supporting method |
| CN205224013U (en) * | 2015-12-21 | 2016-05-11 | 郭永 | But recovery type steel diaphragm wall |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109056765A (en) * | 2018-07-20 | 2018-12-21 | 广东建邦兴业集团有限公司 | A kind of foundation ditch construction method of anti-collapse flood bubble |
| CN110295606A (en) * | 2019-07-05 | 2019-10-01 | 广州穗岩土木科技股份有限公司 | A kind of foundation pit interlocking pile water stop construction method |
| CN113529730A (en) * | 2021-07-28 | 2021-10-22 | 中建八局天津建设工程有限公司 | Construction method of foundation pit |
| CN113863076A (en) * | 2021-09-27 | 2021-12-31 | 中国一冶集团有限公司 | Construction method of sunken road under sandbar bridge |
| CN113863076B (en) * | 2021-09-27 | 2023-10-24 | 中国一冶集团有限公司 | Sinking road construction method under sand bridge |
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Application publication date: 20180216 |