CN108005085A - Foundation pit supporting construction and its construction method - Google Patents
Foundation pit supporting construction and its construction method Download PDFInfo
- Publication number
- CN108005085A CN108005085A CN201711256181.4A CN201711256181A CN108005085A CN 108005085 A CN108005085 A CN 108005085A CN 201711256181 A CN201711256181 A CN 201711256181A CN 108005085 A CN108005085 A CN 108005085A
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- Prior art keywords
- foundation pit
- sump
- hole
- well
- supporting construction
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Classifications
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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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
-
- 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
- E02D5/20—Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
Abstract
The invention discloses a kind of foundation pit supporting construction and its construction method, including retaining piles and water-stop curtain, side slope is provided with the top of the foundation pit side-wall, gutter outside the hole connected with municipal drainage system is both provided with the top and bottom of the side slope, the bottom of foundation ditch is provided with hole internal drainage ditch close to its side-walls, the sump connected with hole internal drainage ditch is provided with the foundation pit, the outer gutter of the hole internal drainage ditch and hole circularizes closed.It is be combined with each other by a variety of drainage measures, the aqueous in foundation pit is discharged in time, prevents aqueous is accumulated in foundation pit from causing foundation pit collapse.
Description
Technical field
The present invention relates to technical field of building construction, more specifically, it relates to a kind of foundation pit supporting construction and its construction
Method.
Background technology
With the development of urban construction, skyscraper gradually increases, and urban architecture thing is increasingly intensive.Due to the use of function and
The requirement of the underground space is developed, skyscraper is generally designed larger planar dimension and the basement of depth.Existing foundation pit branch
Shield is common to use drill-pouring piling wall, cheats interior setting horizontal reinforcement concrete support, thus improves the firm of foundation pit enclosure structure
Degree and stability, preferably control foundation pit deformation, foundation pit accident is greatly reduced.
Patent announcement number is to disclose a kind of foundation pit supporting construction and its construction party in the Chinese patent of CN102011404B
Method, including pattern foundation pit supporting structure campshed, sealing, only native curtain, and anti-side campshed, pattern foundation pit supporting structure campshed are arranged in long stake, stub
The cast in place concrete thin tunnel pile at interval, sealing, only native curtain and anti-side campshed are disposed as cement mixing pile, and sealing, stop
Native curtain is arranged to the engaged cement mixing pile of a row, and anti-side campshed is arranged to the cement mixing of the two-way occlusion of some rows
Stake, only sealing, native curtain are arranged on pattern foundation pit supporting structure campshed and correspond to foundation pit periphery side, and anti-side campshed is arranged on pattern foundation pit supporting structure campshed
In the hole bottom of corresponding foundation pit side.
But, the ground such as soil property softer coastal erosion and deposition Plain more in precipitation, soil layer is interior to contain a large amount of mud and fine sand, soil
Matter is soft, if water-impervious and drainage measure not enough fully rationally, the supportings such as support pile are easily caused after the rainwater accumulation in foundation pit
The loosening of structure, so as to cause foundation pit collapse.
The content of the invention
The object of the present invention is to provide a kind of foundation pit supporting construction, can discharge the aqueous in foundation pit in time, prevent water
Liquid accumulation causes foundation pit collapse.
The present invention above-mentioned technical purpose technical scheme is that：
A kind of foundation pit supporting construction, including retaining piles and water-stop curtain, are provided with side slope at the top of the foundation pit side-wall, described
Gutter outside the hole connected with municipal drainage system is both provided with the top and bottom of side slope, the bottom of foundation ditch is close to its side-walls
Hole internal drainage ditch is provided with, the sump connected with hole internal drainage ditch, the hole internal drainage ditch and hole are provided with the foundation pit
Outer gutter circularizes closed.
By using above-mentioned technical proposal, after the aqueous outside hole is discharged into the outer gutter in hole, municipal administration is discharged to by drainage channel
In drainage system, prevent the aqueous in foundation pit side-wall from penetrating into foundation pit by water-stop curtain, the aqueous in hole in hole by arranging
Ditch is drained into sump, in time can be discharged the aqueous in foundation pit, prevents aqueous is accumulated in foundation pit from causing to hinder to construction
Hinder, while prevent aqueous from causing the loosening for causing the supporting construction such as retaining piles after loosing soil, prevent foundation pit collapse.
Preferably, gutter is located on the outside of foundation pit side-wall at 1~2m outside the hole of the side slope bottom.
By using above-mentioned technical proposal, in work progress outside the hole of reasonable Arrangement side slope bottom gutter position, protect
While card can drain the aqueous outside hole in time, prevent that cheating outer gutter causes foundation pit side-wall to cave in.
Preferably, the sump is distributed in foundation pit corner and foundation pit bottom surface.
By using above-mentioned technical proposal, sump reasonable layout, while ensureing that the aqueous in foundation pit can be collected, prevents
Only normal construction is caused to hinder.
Preferably, well casing is vertically arranged with the sump, the well casing is wrapped on the outside of steel reinforcement cage including steel reinforcement cage
Flexible porous tube.
By using above-mentioned technical proposal, the aqueous in bottom of foundation ditch soil can be discharged into well casing by infiltration, can be by base
Aqueous discharge in hole.
Preferably, it is filled with filtrate between flexible porous tube and the sump madial wall.
By using above-mentioned technical proposal, tube wall is supported by filtrate, can be to water while preventing that tube wall from caving in
Liquid is filtered, and prevents well casing from blocking.
Preferably, sedimentation basin is provided with the foundation pit, the sedimentation basin is equipped with water pump, be provided with the water pump by
The water pipe that sedimentation basin is connected with cheating outer gutter.
By using above-mentioned technical proposal, after by water pump, the aqueous in sump is drawn into sedimentation basin, mud and
Native slag precipitation, prevents mud and native slag from being polluted to environment, and the aqueous in sedimentation basin is drawn into the outer draining in hole by water pump
Discharged in ditch.
Preferably, the water-stop curtain includes what is be disposed side by side between retaining piles and foundation pit madial wall and be mutually twisted
Three axes agitating pile.
By using above-mentioned technical proposal, play the role of good antiseepage by three axes agitating pile, prevent in foundation pit side-wall
Aqueous penetrate into foundation pit.
Preferably, high-pressure rotary jet grouting pile, the high-pressure rotary jet grouting pile one are provided between the three axes agitating pile and retaining piles
Side is contradicted with retaining piles, and opposite side is contradicted with three axes agitating pile.
It is more convenient in foundation pit mesohigh jet grouting pile construction by using above-mentioned technical proposal, pass through high-pressure rotary jet grouting pile pair
Three axes agitating pile is supported.
The present invention also aims to provide a kind of construction method of foundation pit supporting construction, with reach work progress facilitate it is fast
Prompt, safe and reliable purpose.
The present invention above-mentioned technical purpose technical scheme is that：
A kind of construction method of foundation pit supporting construction, comprises the following steps：
A, the construction of top of the slope hardening：Gentle slope is repaired, buries gunite concrete thickness control mark, concrete sprayer injection first
After layer concrete, binding, fixed steel bars net and setting reinforcing rib, the second layer concrete of injection is to design thickness, in top of the slope and slope
Bottom, which is excavated, cheats outer gutter；
B, three axes agitating pile is constructed：Surveying setting-out, machine excavate groove, and three axes agitating pile stake machine is in place, stir sink down into design hole in advance
Deep, whitewashing, stirring, lifted, and is repeated stirring and is sunk, and is repeated stirring whitewashing and is promoted to stake top absolute altitude, the displacement of three axes agitating pile stake machine；
C, retaining piles are constructed：Surveying and locating, excavation supporting campshed construction groove, stake machine is in place, vibrates the immersed tube of retaining piles
To design hole depth, unclamp and remove vibration hammer and clamper, place steel reinforcement cage, vibration hammer and gripper return, immersed tube intracavitary fills
Concrete is noted, stake, the displacement of stake machine, pile crown protection are pulled into vibration；
D, Construction of High Pressure Jet Grouting Pile：Measurement and positioning, drilling machine pore-creating in place, high spray booth car is in place, lower pipe inspection, slurries injection, rotation
Pendulum is promoted to stake top absolute altitude, and drilling machine and high spray booth car move to next hole position；
E, drainage of foundation pit：Sump is set every 20m in foundation pit corner and horizontal direction according to excavation of foundation pit progress, is each catchmented
Well is equipped with a water pump, and when being excavated to projected depth, measured unwrapping wire, determines sump position, builds sump and makes it
Connected with hole internal drainage ditch；
F, foundation pit construction：Descending grade at the top of excavation slope, retaining piles top capping beam pour, and pit earthwork excavates outward transport.
Preferably, the construction procedure of the sump in the step e includes：
S1, pore-forming：Using Spiral digging machine pore-forming, 800~1000mm of bore diameter, with mud off, aperture sets casing, and one
Side sets spoil disposal ditch, mud sump；
S2, well casing installation：Well casing is seated in hole, and the good flexible porous tube of water penetration is installed on water-bearing layer corresponding position；
S3, fill out gravel：Well casing must be placed in the middle before filling out gravel, makes to fill out that gravel thickness is uniform, and filtrate slowly should symmetrically be inserted from well casing both sides, with
Anti- filtrate midway casey and well casing dislocation, are tamped when being filled to 1-2m meters of well head with clay；
S4, well-flushing：After filtrate has filled, well-flushing is carried out immediately, well-flushing notes clear water round-robin method technique outside using well casing,
Take out, stop replacing, untill water sand removal is net.Measurement well depth, clears up shaft bottom before well-flushing terminates, and shaft bottom precipitation is less than 0.3m.
In conclusion the invention has the advantages that：
1st, a variety of drainage measures cooperate, and in time can discharge the aqueous in foundation pit, prevent aqueous is accumulated in foundation pit from causing
Foundation pit collapse；
2nd, construction procedure safe and reasonable, while ensureing that foundation pit supporting construction is safe and reliable, convenient and quick construction.
Brief description of the drawings
Fig. 1 is the structure diagram of foundation pit supporting construction in the present embodiment；
Fig. 2 is the top view of foundation pit supporting construction in the present embodiment；
Fig. 3 is the structure diagram of sump in the present embodiment；
Fig. 4 is the structure diagram for desilting mechanism in the present embodiment in sump；
Fig. 5 is the structure diagram for being in charge of runner in tube wall in the present embodiment；
Fig. 6 is the structure diagram in holding tank in the present embodiment.
Reference numeral：1st, retaining piles；2nd, side slope；3rd, outer gutter is cheated；4th, internal drainage ditch is cheated；5th, sump；6th, three axis
Mixing pile；7th, banket；8th, mud；9th, powder fine sand；10th, medium coarse sand；11st, strong weathered granite；12nd, middle weathered granite；13rd, it is high
Pressure rotary-spraying stake；14th, change and banket；15th, well casing；151st, steel reinforcement cage；152nd, flexible porous tube；16th, filtrate；17th, sedimentation basin；18th, well
Lid；19th, it is in charge of；20th, shaft；21st, agitator arm；22nd, cleaning device；23rd, holding tank；24th, driven wheel of differential；25th, active conical tooth
Wheel；26th, runner；27th, blade；28th, motor；29th, screw；30th, connector；31st, support shaft.
Embodiment
The present invention is described in further detail below in conjunction with attached drawing.
This specific embodiment is only explanation of the invention, it is not limitation of the present invention, people in the art
Member as needed can make the present embodiment the modification of no creative contribution after this specification is read, but as long as at this
All protected in the right of invention be subject to Patent Law.
A kind of foundation pit supporting construction, as depicted in figs. 1 and 2, including the retaining piles 1 and water-stop curtain being vertically arranged, base
Side slope 2 is provided with the top of the side wall of hole, the top and bottom of side slope 2 are both provided with gutter outside the hole connected with municipal drainage system
3, bottom of foundation ditch is provided with hole internal drainage ditch 4 close to its side-walls, and some collection connected with hole internal drainage ditch 4 are provided with foundation pit
Well 5, sump 5 are distributed on foundation pit corner and foundation pit bottom surface, the cyclic Shape closed in the outer gutter 3 of hole internal drainage ditch 4 and hole
Shape.After aqueous outside hole is discharged into the outer gutter 3 in hole, the aqueous cheated in outer gutter 3 is discharged into municipal drainage system by drainage channel
In system, prevent the aqueous in foundation pit side-wall from penetrating into foundation pit by water-stop curtain, the aqueous in hole is by cheating 4 row of internal drainage ditch
Enter into sump 5, in time can discharge the aqueous in foundation pit, prevent aqueous is accumulated in foundation pit from causing to hinder to construction, together
When prevent aqueous from causing the loosening for causing the supporting construction such as retaining piles 1 after loosing soil, prevent foundation pit collapse.
Gutter 3 is located on the outside of foundation pit side-wall at 1~2m outside the hole of 2 bottom of side slope.Reasonable Arrangement side slope 2 in work progress
The position in gutter 3 outside the hole of bottom, while guarantee can drain the aqueous outside hole in time, prevents that cheating outer gutter 3 causes
Foundation pit side-wall caves in.
Water-stop curtain includes being disposed side by side on the three axes agitating pile between retaining piles 1 and foundation pit madial wall and being mutually twisted
6, the soil property of foundation pit is divided into the 7, mud 8 that bankets, Extra-fine sand, medium coarse sand 10, strong weathered granite 11 and middle weathering flower from top to down
Hilllock rock 12, the depth of 6 lower end of three axes agitating pile insertion, 11 layers of strong weathered granite are more than 1m.Played by three axes agitating pile 6 good
Good antiseepage effect, prevents the aqueous in foundation pit side-wall from penetrating into foundation pit.
High-pressure rotary jet grouting pile 13 is provided between three axes agitating pile 6 and retaining piles 1,13 side of high-pressure rotary jet grouting pile is arranged with supporting
Stake 1 contradicts, and opposite side is contradicted with three axes agitating pile 6.Construct in foundation pit mesohigh rotary churning pile 13 more convenient, pass through high-pressure rotary-spray
13 pairs of three axes agitating piles 6 of stake are supported.
Soil on foundation pit bottom surface bankets 14 to change, and it is 1~3m to change 14 thickness of banketing；14 base is displaced by changing to banket
The mud 8 of bottom surface is cheated, makes foundation pit bottom surface keep drying solid, easy to construct.
As shown in Figures 2 and 3, well casing 15 is vertically arranged with sump 5, well casing 15 is wrapped in steel including steel reinforcement cage 151
The flexible porous tube 152 in the outside of muscle cage 151, is filled with filtrate 16, filtrate between 5 madial wall of flexible porous tube 152 and sump
16 be Guamishi.Aqueous in bottom of foundation ditch soil can be discharged into well casing 15 by infiltration, can be discharged the aqueous in foundation pit；It is logical
Cross Guamishi to be supported 15 tube wall of well casing, while preventing that tube wall from caving in, aqueous can be filtered, prevent that well casing 15 is stifled
Plug.
As shown in figure 4, being provided with the mechanism that desilts for extracting shaft bottom mud in sump 5, sump 5 is equipped with well lid
18, sedimentation basin 17 is provided with foundation pit（Such as Fig. 2）, sump 5 is equipped with slush pump（Not shown in figure）, it is provided with slush pump
The extraction mud pipe that sump 5 is connected with sedimentation basin 17, extraction mud pipe include being vertically arranged in sump 5 being in charge of 19, are in charge of 19
In be rotatably connected to the shaft 20 being vertically arranged, shaft 20 is fixed with its axial rotation, shaft 20 for stirring shaft bottom silt
The agitator arm 21 of mud 8 and the cleaning device 22 abutted with flexible porous tube 152, are in charge of and the rotation of drive shaft 20 are provided with 19
First driving mechanism, driving is provided with well lid 18 and is in charge of 19 the second vertically movable driving mechanisms.
As shown in Figure 4, Figure 5 and Figure 6, it is in charge of in 19 tube walls and is provided with holding tank 23, the first driving mechanism includes being fixed on
Driven wheel of differential 24 in shaft 20, further includes to be rotationally connected with and is in charge of 19 and horizontally disposed support shaft 31, support shaft 31 around
Its axial rotation, is fixed with the drive bevel gear 25 engaged with driven wheel of differential 24 in support shaft 31, drive bevel gear 25 and from
Dynamic bevel gear 24 is respectively positioned in holding tank 23；Runner 26 is fixed with support shaft 31, circle distribution has blade 27, portion on runner 26
Leaflet piece 27 is stretched out from holding tank 23 and positioned at the hollow space for being in charge of 19, runner 26 rotates when being in charge of 19 pumping muddy water, so that band
Dynamic support shaft 31 rotates, and engages drive shaft 20 by Bipyramid gear and agitator arm 21 rotates the mud 8 in stirring shaft bottom, be easy to
Mud 8 is extracted out, prevent mud 8 be deposited in shaft bottom reduce sump 5 collection water capacity, while cleaning device 22 clean it is flexible porous
Pipe 152, prevents flexible porous tube 152 from blocking.
Second driving mechanism includes the motor 28 being fixed on well lid 18, and the silk being vertically arranged is sequentially connected with motor 28
Bar 29, is in charge of on 19 and is fixed with connector 30, and screw 29 is threadedly coupled through connector 30 and with it；Pass through motor 28 and screw
29 drive and are in charge of 19 and move up and down, so as to drive agitator arm 21 so that the mud 8 in sump 5 is extracted it is more clean,
Cleaning device 22 is slided up and down the cleaner of the tube wall cleaning of flexible porous tube 152 at the same time.
The water pump connected with cheating outer gutter 3 is provided with sedimentation basin 17.The mud liquid in sump 5 is taken out by slush pump
After getting in sedimentation basin 17, mud 8 and native slag precipitate, and prevent mud 8 and native slag from being polluted to environment, will be precipitated by water pump
Aqueous in pond 17 is drawn into the outer gutter 3 in hole and discharges.
A kind of construction method of foundation pit supporting construction, comprises the following steps：
A, the construction of top of the slope hardening：Gentle slope is repaired, buries gunite concrete thickness control mark, concrete sprayer injection first
After layer concrete, binding, fixed steel bars net and setting reinforcing rib, the second layer concrete of injection is to design thickness, in top of the slope and slope
Bottom, which is excavated, cheats outer gutter 3.
B, three axes agitating pile 6 is constructed：Surveying setting-out, machine excavate groove, and 6 machines of three axes agitating pile are in place, stir sink down into advance
Hole depth is designed, whitewashing, stirring, lifted, and is repeated stirring and is sunk, and is repeated stirring whitewashing and is promoted to stake top absolute altitude, three axes agitating pile 6
Machine shifts.
C, retaining piles 1 are constructed：Surveying and locating, the construction groove of excavation supporting campshed 1, stake machine is in place, vibrates retaining piles 1
Immersed tube to hole depth is designed, unclamp and remove vibration hammer and clamper, place steel reinforcement cage 151, vibration hammer and gripper return, sink
Concrete perfusion in tube chamber, stake, the displacement of stake machine, pile crown protection are pulled into vibration.
D, high-pressure rotary jet grouting pile 13 is constructed：Measurement and positioning, drilling machine pore-creating in place, high spray booth car is in place, lower pipe inspection, slurries spray
Penetrate, swing is promoted to stake top absolute altitude, drilling machine and high spray booth car move to next hole position.
E, drainage of foundation pit：Interim catchment is set every 20m in foundation pit corner and horizontal direction according to excavation of foundation pit progress
Well 5, each sump 5 are equipped with a water pump, and when being excavated to projected depth, measured unwrapping wire, determines 5 position of sump, repair
Build sump 5 and it is connected with hole internal drainage ditch 4.
F, foundation pit construction：2 top descending grade of excavation slope, 1 top capping beam of retaining piles pour, and pit earthwork excavates outer
Fortune.
Prevent the aqueous in foundation pit side-wall from penetrating into foundation pit using three axes agitating pile 6, can be by base using sump 5 and gutter
Aqueous in hole is discharged in time, and drainage measure is fully reasonable, so that soil conservation drying regime in hole, easy to the same of construction
When, prevent from causing that the soil is porous in the case where rainwater soaks.
The construction procedure of sump 5 in step e includes：
S1, pore-forming：According to soil condition and hole depth requirement, using Spiral digging machine pore-forming, 800~1000mm of bore diameter, uses mud
Retaining wall, aperture sets casing, and spoil disposal ditch, mud sump are set in side.
S2, well casing 15 are installed：Well casing 15 is placed strictly tells somebody what one's real intentions are progress by site technology, and internal wall of pipe orifice does not misplace, and selection is saturating
Water-based good flexible porous tube 152 is installed on water-bearing layer corresponding position.
S3, fill out gravel：Filling out well casing 15 before gravel must be placed in the middle, makes to fill out that gravel thickness is uniform, and filtrate 16 should be from 15 both sides of well casing slowly
Symmetrically insert, misplace to prevent 16 midway casey of filtrate and well casing 15, tamped when being filled to 1-2m meters of well head with clay.
S4, well-flushing：After filtrate 16 has filled, well-flushing is carried out immediately, well-flushing is using note clear water circulation outside well casing 15
Method technique, takes out, stops replacing, untill water sand removal is net.Measurement well depth, clears up shaft bottom before well-flushing terminates, and is less than shaft bottom precipitation
0.3m。
Claims (10)
1. a kind of foundation pit supporting construction, including retaining piles (1) and water-stop curtain, it is characterized in that：The top of the foundation pit side-wall
Side slope (2) is provided with, gutter (3) outside the hole connected with municipal drainage system are both provided with the top and bottom of the side slope (2),
The bottom of foundation ditch is provided with hole internal drainage ditch (4) close to its side-walls, is provided with the foundation pit with hole internal drainage ditch (4) even
Logical sump (5), the outer gutter (3) of the hole internal drainage ditch (4) and hole circularize closed.
2. foundation pit supporting construction according to claim 1, it is characterized in that：Gutter (3) outside the hole of side slope (2) bottom
At 1~2m on the outside of foundation pit side-wall.
3. foundation pit supporting construction according to claim 1, it is characterized in that：The sump (5) is distributed in foundation pit corner
And foundation pit bottom surface.
4. the foundation pit supporting construction according to claim 1 or 3, it is characterized in that：Well is vertically arranged with the sump (5)
Manage (15), the well casing (15) includes the flexible porous tube (152) that steel reinforcement cage (151) is wrapped on the outside of steel reinforcement cage (151).
5. foundation pit supporting construction according to claim 4, it is characterized in that：The flexible porous tube (152) and sump (5)
Filtrate (16) is filled between madial wall.
6. foundation pit supporting construction according to claim 5, it is characterized in that：Sedimentation basin (17), institute are provided with the foundation pit
State sedimentation basin (17) and be equipped with water pump, the water pipe for connecting sedimentation basin (17) with cheating outer gutter (3) is provided with the water pump.
7. foundation pit supporting construction according to claim 1, it is characterized in that：The water-stop curtain includes being disposed side by side on supporting
Between campshed (1) and foundation pit madial wall and the three axes agitating pile (6) that is mutually twisted.
8. foundation pit supporting construction according to claim 7, it is characterized in that：The three axes agitating pile (6) and retaining piles (1)
Between be provided with high-pressure rotary jet grouting pile (13), high-pressure rotary jet grouting pile (13) side is contradicted with retaining piles (1), opposite side and three axis
Mixing pile (6) contradicts.
9. a kind of construction method of foundation pit supporting construction, it is characterized in that：Comprise the following steps：
A, the construction of top of the slope hardening：Gentle slope is repaired, buries gunite concrete thickness control mark, concrete sprayer injection first
After layer concrete, binding, fixed steel bars net and setting reinforcing rib, the second layer concrete of injection is to design thickness, in top of the slope and slope
Bottom, which is excavated, cheats outer gutter (3)；
B, three axes agitating pile (6) is constructed：Surveying setting-out, machine excavate groove, and three axes agitating pile (6) stake machine is in place, stirs sink down into advance
Hole depth is designed, whitewashing, stirring, lifted, and is repeated stirring and is sunk, and is repeated stirring whitewashing and is promoted to stake top absolute altitude, three axes agitating pile (6)
Stake machine displacement；
C, retaining piles (1) are constructed：Surveying and locating, excavation supporting campshed (1) construction groove, stake machine is in place, vibrates retaining piles
(1) immersed tube unclamps to hole depth is designed and removes vibration hammer and clamper, places steel reinforcement cage (151), vibration hammer and clamper are answered
Position, immersed tube intra-bladder instillation concrete, stake, the displacement of stake machine, pile crown protection are pulled into vibration；
D, high-pressure rotary jet grouting pile (13) is constructed：Measurement and positioning, drilling machine pore-creating in place, high spray booth car is in place, lower pipe inspection, slurries spray
Penetrate, swing is promoted to stake top absolute altitude, drilling machine and high spray booth car move to next hole position；
E, drainage of foundation pit：Sump (5) is set every 20m in foundation pit corner and horizontal direction according to excavation of foundation pit progress, each
Sump (5) is equipped with a water pump, and when being excavated to projected depth, measured unwrapping wire, determines sump (5) position, builds collection
Well (5) simultaneously makes it be connected with hole internal drainage ditch (4)；
F, foundation pit construction：Descending grade at the top of excavation slope (2), retaining piles (1) top capping beam pour, and pit earthwork excavates outer
Fortune.
10. the construction method of foundation pit supporting construction according to claim 9, it is characterized in that：Sump in the step e
(5) construction procedure includes：
S1, pore-forming：Using Spiral digging machine pore-forming, 800~1000mm of bore diameter, with mud off, aperture sets casing, and one
Side sets spoil disposal ditch, mud sump；
S2, well casing (15) installation：Well casing (15) is seated in hole, and the good flexible porous tube of water penetration (152) is installed on and is contained
Water layer corresponding position；
S3, fill out gravel：Filling out well casing (15) before gravel must be placed in the middle, makes to fill out that gravel thickness is uniform, and filtrate (16) should be slow from well casing (15) both sides
Slowly symmetrically insert, misplace to prevent filtrate (16) midway casey and well casing (15), tamped when being filled to 1-2m meters of well head with clay；
S4, well-flushing：After filtrate (16) has filled, well-flushing is carried out immediately, and well-flushing is noted clear water using well casing (15) and circulated outside
Method technique, takes out, stops replacing, and untill water sand removal is net, measurement well depth, clears up shaft bottom before well-flushing terminates, and is less than shaft bottom precipitation
0.3m。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711256181.4A CN108005085B (en) | 2017-12-04 | 2017-12-04 | Foundation pit supporting structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711256181.4A CN108005085B (en) | 2017-12-04 | 2017-12-04 | Foundation pit supporting structure and construction method thereof |
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| CN108005085A true CN108005085A (en) | 2018-05-08 |
| CN108005085B CN108005085B (en) | 2020-01-03 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108797618A (en) * | 2018-06-21 | 2018-11-13 | 中国十七冶集团有限公司 | One kind being used for Urban Underground pipe gallery drainage of foundation pit structure and its construction method |
| CN108914944A (en) * | 2018-07-27 | 2018-11-30 | 中国冶集团有限公司 | Shoal high water level pipeline Support of Foundation Pit Excavation precipitation system and construction method |
| CN109837966A (en) * | 2019-03-06 | 2019-06-04 | 中国十七冶集团有限公司 | The structure and construction method of cushion processing trunk canal side slope foundation pit side-wall water-stop curtain |
| CN111139839A (en) * | 2020-01-11 | 2020-05-12 | 成都高质建筑工程有限公司 | Foundation pit support system and construction method thereof |
| CN112459078A (en) * | 2020-11-11 | 2021-03-09 | 中国建筑第二工程局有限公司 | Construction method of foundation pit supporting system |
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| CN109837966B (en) * | 2019-03-06 | 2020-10-30 | 中国十七冶集团有限公司 | Structure for treating lateral wall waterproof curtain of foundation pit on main channel side slope by replacement and filling method and construction method |
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