CN216973425U - Inclined prefabricated steel pile foundation pit supporting system capable of being supported and excavated firstly - Google Patents
Inclined prefabricated steel pile foundation pit supporting system capable of being supported and excavated firstly Download PDFInfo
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- CN216973425U CN216973425U CN202220454138.9U CN202220454138U CN216973425U CN 216973425 U CN216973425 U CN 216973425U CN 202220454138 U CN202220454138 U CN 202220454138U CN 216973425 U CN216973425 U CN 216973425U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 159
- 239000010959 steel Substances 0.000 title claims abstract description 159
- 239000004567 concrete Substances 0.000 claims abstract description 44
- 239000002689 soil Substances 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 claims description 18
- 238000009412 basement excavation Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 40
- 238000000034 method Methods 0.000 abstract description 16
- 238000003466 welding Methods 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 19
- 238000004080 punching Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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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
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- General Engineering & Computer Science (AREA)
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- Piles And Underground Anchors (AREA)
Abstract
The utility model discloses a supporting and then digging inclined prefabricated steel pile foundation pit supporting system, which consists of a foundation pit support structure, an inclined prefabricated steel pile, a pile top crown beam and back-filling concrete, can solve the problem that the construction operation range of an inclined pile driving machine requires the limitation that the distance between a foundation pit digging sideline and a land red line is at least 5m, and is formed by welding or flange connection of a plurality of sections of single prefabricated steel piles. The length and the section area of the single precast steel pile can be adjusted according to actual needs. After the prefabricated steel pile is pressed into the designed elevation of the soil layer, concrete is poured into the prefabricated steel pile, and the compression resistance of steel and concrete is fully exerted. After the foundation pit is completed, the upper part of the steel pile can be repeatedly utilized after being cut, and the method has the advantages of simplicity in construction, high efficiency, cost saving and the like.
Description
Technical Field
The utility model belongs to the technical field of foundation pit supporting, and particularly relates to a supporting and excavating system for an inclined prefabricated steel pile foundation pit.
Background
In recent years, along with the rapid development of economy in China, the number of urban high-rise buildings is increased, the space between the buildings is reduced, the foundation pit deformation control conditions of the structures become more severe, on the premise that the deformation requirements are met, the cost is often further reduced, new requirements are provided for designers, and various novel foundation pit supporting means are developed accordingly. In addition to traditional inner support, anchor pile structure support, cantilever support and the like, the inclined pile type foundation pit support is increasingly concerned by designers due to the advantages of short construction period, simple process, low counterfeiting per linear meter, deep foundation pit depth, no red line detection due to the arrangement of the inclined pile support in the foundation pit and the like. The existing inclined pile foundation pit supporting means mostly adopt spliced prefabricated concrete square piles, the bearing capacity of the prefabricated concrete square piles is good, but the prefabrication process is complex, in the actual construction process, the construction operation range of an inclined pile driving machine requires that the distance between the excavation side line of the foundation pit and the ground red line is at least 5m, a designer does not give attention to the construction operation range of the inclined pile driving machine, so that the distance between the excavation side line of the foundation pit and the ground red line is in contradiction, and a part of the inclined prefabricated concrete square pile foundation pit scheme cannot be normally constructed, so that the problem of modifying a certain amount of foundation pit enclosure design scheme is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a supporting system for an inclined prefabricated steel pile foundation pit, which is firstly supported and then dug, according to the defects of the prior art. The supporting system is used as a novel foundation pit supporting system, can solve the problem that the distance between a foundation pit excavation side line and a land red line is at least 5m when the construction operation range of the inclined pile driving machinery is required, can avoid the problem that the design scheme of the foundation pit enclosure of the inclined prefabricated concrete square pile is modified because designers do not give attention to the construction operation range of the inclined pile driving machinery, and has the advantages of simple prefabricated steel pile prefabrication process, short construction period, capability of recycling the cut upper part of the steel pile after the foundation pit is finished, and remarkable economic value.
In order to realize the purpose, the utility model adopts the following technical scheme: designing a supporting and supporting system of a foundation pit with an inclined prefabricated steel pile, which is firstly supported and then excavated, and being characterized in that the supporting and supporting system consists of a foundation pit support structure, the inclined prefabricated steel pile, a pile top crown beam and recharging concrete; pouring the top end of the foundation pit support structure and the top end of the inclined prefabricated steel pile into a pile top crown beam; the slant prefabricated steel pile is filled with recycled concrete, the lower end of the slant prefabricated steel pile is arranged in the designed elevation of the soil layer, and an acute angle is formed between the slant prefabricated steel pile and the foundation pit enclosure structure; the lower end of the oblique prefabricated steel pile is sealed by a sealing steel plate, and a certain number of through holes are reserved on the sealing steel plate; the inclined prefabricated steel piles are arranged in a plurality of numbers at intervals along the length direction of the foundation pit support structure.
Compared with the prior art, the utility model has the following advantages:
1. the technology can solve the limitation that the construction operation range of the inclined pile driving machine requires that the distance between the excavation sideline of the foundation pit and the land red line is at least 5m, and avoid the problem that the design scheme of the enclosure of the foundation pit of the inclined precast concrete square pile is modified because a designer does not care about the construction operation range of the inclined pile driving machine.
2. The prefabricated steel pile supports can realize open excavation of foundation pit earthwork without retaining back pressure soil, and the problem that the conventional slope excavation occupies a large area is solved.
3. The bottom end of the slant prefabricated steel pile is sealed by the steel plate and is reserved with a certain number of through holes, so that on one hand, the lower end of the slant prefabricated steel pile is not filled by miscellaneous filling soil in the process of pressing the slant prefabricated steel pile into a soil layer, so that concrete is fully poured into the slant prefabricated steel pile, on the other hand, the poured concrete can seep out through the reserved through holes, a concrete inclusion is formed at the bottom of the slant prefabricated steel pile and the surrounding soil body, and the compression resistance and the soil body friction force of the slant prefabricated steel pile are effectively enhanced.
4. The prefabricated simple process of slant prefabricated steel pile, construction period are short, and after the foundation ditch was accomplished, can reuse after the cutting of upper portion steel pile, have advantages such as construction is simple, efficient, practice thrift the cost.
Drawings
Fig. 1 is a schematic sectional structure view of an embodiment of a supporting and excavating system for an inclined prefabricated steel pile foundation pit.
Fig. 2 is a schematic structural view of a sealing steel plate of an embodiment of a supporting-then-digging foundation pit supporting system for an inclined prefabricated steel pile of the utility model.
Fig. 3 is a schematic view of an application scenario of an embodiment of the foundation pit supporting system of the inclined prefabricated steel pile, which is formed by supporting and excavating firstly.
The method comprises the following steps of 1-foundation pit enclosing structure, 2-inclined prefabricated steel pile, 3-pile top crown beam, 4-recycled concrete, 5-sealing steel plate, 6-concrete inclusion and 7-recycled concrete pouring end.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments.
The utility model provides a supporting system (a supporting system for short, see fig. 1-3) of an inclined prefabricated steel pile foundation pit, which is firstly supported and then excavated, and the supporting system consists of a foundation pit support structure 1, an inclined prefabricated steel pile 2, a pile top crown beam 3 and recycled concrete 4. The top end of the foundation pit support structure 1 and the top end of the inclined prefabricated steel pile 2 are poured in the pile top crown beam 3; the slant prefabricated steel pile 2 is filled with the recycled concrete 4, the lower end of the slant prefabricated steel pile is arranged in the designed elevation position of the soil layer, and an acute angle is formed between the slant prefabricated steel pile 2 and the foundation pit enclosure structure 1. The lower end of the slant prefabricated steel pile 2 is sealed by a sealing steel plate 5, and a certain number of through holes are reserved on the sealing steel plate 5. The inclined prefabricated steel piles 2 are arranged in a plurality of numbers at intervals along the length direction of the foundation pit support structure 1.
The foundation pit enclosure structure 1 is suitable for selecting cast-in-situ bored piles, profile steel cement soil mixing walls and steel pipe cement soil mixing walls in the conventional way, but the utility model is not limited to the foundation pit enclosure forms, and also comprises foundation pit enclosure forms such as double-row piles, precast piles and the like.
The inclined prefabricated steel pile 2 and the foundation pit support structure 1 are arranged in an angle of 30-50 degrees, the inclined prefabricated steel pile 2 is a plurality of sections of prefabricated single steel piles, and is formed into a whole through welding or flange connection, the length of each prefabricated single steel pile is 6-18 m, the cross section of each prefabricated single steel pile is in a circular or square shape, the circular diameter is phi 400mm, phi 500mm and phi 600mm, and the side length of each square is 300mm, 350mm, 400mm, 450mm, 500mm, 550mm and 600 mm.
The bottom end of the slant prefabricated steel pile 2 is sealed by a sealing steel plate 5, a certain number of through holes with the diameter not larger than 50mm are reserved on the sealing steel plate 5, on one hand, the steel plate seal at the bottom end of the steel pile can protect the lower end of the slant prefabricated steel pile from being filled with miscellaneous filling soil in the process of pressing the slant prefabricated steel pile into a soil layer, on the other hand, the filled concrete can seep out through the reserved through holes, a concrete inclusion 6 is formed at the bottom of the slant prefabricated steel pile and the surrounding soil body, the compression resistance and the soil body friction force of the slant prefabricated steel pile are effectively enhanced,
the slant prefabricated steel pile 2 and the back cast concrete 4 jointly meet the design value requirement of the bearing capacity of the pile foundation, the design value of the bearing capacity of the pile foundation should meet the requirements of checking calculation of the stability of the foundation pit, calculation of the bearing capacity and deformation of the building enclosure, checking calculation of the bearing capacity of components, precipitation requirements, technical requirements of earth excavation, detection requirements and monitoring requirements, the bottom of the slant prefabricated steel pile filled with the back cast concrete is ensured to be positioned in a stable bearing layer, a process test, namely a prefabricated steel pile compressive load test, is carried out in the formal construction period, and the bearing capacity of a single pile and the deformation of the prefabricated steel pile are ensured to meet the design requirements.
Constructing a foundation pit enclosure structure 1 with the thickness of 800 mm-1000 mm after the side line of the foundation pit is retreated, after the construction of the foundation pit enclosure structure 1 is completed, connecting a single prefabricated steel pile into a whole by welding or flange connection according to the construction design length requirement, sealing the bottom end of an inclined prefabricated steel pile 2 by a sealing steel plate 5 and reserving a certain number of through holes with the diameter of not more than 50mm, simultaneously moving a punching pile driver to a position to be constructed, starting a power device, adjusting the construction angle of a drill bit of the punching pile driver according to a construction drawing, obliquely drilling and cutting soil bodies at the elevation position of a crown beam at the top of the pile by the punching pile driver, cleaning the holes, hoisting, placing and welding the integral inclined prefabricated steel pile 2 until the inclined prefabricated steel pile 2 is pressed into the designed elevation of the soil layer, pouring concrete uniformly stirred into the inclined prefabricated steel pile 2 along a pouring end 7 until the construction of all the prefabricated steel piles is completed, and after the strength grade of 4 of the inclined prefabricated steel pile 2 reaches 70% of the design strength, and integrally pouring the top ends of the foundation pit support structure 1 and the inclined prefabricated steel pile 2 into the pile top crown beam 3, and forming an inclined prefabricated steel pile foundation pit support system after the strength grade of concrete in the pile top crown beam reaches 70% of the design strength.
The construction method of the inclined prefabricated steel pile foundation pit supporting system adopting the support and excavation steps comprises the following steps:
the method comprises the following steps: according to the foundation pit stability checking calculation, the building envelope bearing capacity and deformation calculation, the component bearing capacity checking calculation, the precipitation requirement, the earthwork excavation technical requirement, the detection requirement and the monitoring requirement, the size of the oblique prefabricated steel pile 2 meeting the pile foundation bearing capacity design value requirement, the distance between the adjacent oblique prefabricated steel piles 2 and the number of the oblique prefabricated steel piles 2 needing to be installed are obtained, and the prefabricated single steel piles meeting the requirements are transported to a construction site;
step two: constructing a foundation pit enclosure structure at a position of 800 mm-1000 mm outside an excavation sideline of the foundation pit;
step three: after the foundation pit support structure construction is completed, the prefabricated single steel piles are welded or connected through flanges to form a whole according to the construction design length requirement, an inclined prefabricated steel pile 2 is formed, and the bottom end of the inclined prefabricated steel pile is sealed by a sealing steel plate with a certain number of through holes with the diameter of 50 mm;
step four: moving the punching pile driver to a position to be constructed, starting a power device of the punching pile driver, adjusting the construction angle of a drill bit of the punching pile driver according to a construction drawing, obliquely drilling at the elevation position of the pile top crown beam by the punching pile driver to cut soil and clear holes, and stopping drilling when the drilling depth reaches a designed value; then, hoisting the oblique prefabricated steel pile 2 into the hole, and pressing the oblique prefabricated steel pile 2 into the designed elevation of the soil layer; the punching depth (hole slant length) of the punching pile driver is 1m longer than the length of the slant prefabricated steel pile 2.
Step five: pouring the uniformly stirred concrete into the inclined prefabricated steel pile 2 along the back pouring concrete pouring end 7 of the inclined prefabricated steel pile 2;
step six: the punching pile driver is shifted, the fourth step and the fifth step are repeated, and the next oblique prefabricated steel pile 2 is constructed in sequence until all the oblique prefabricated steel piles 2 are constructed;
step seven: after the strength grade of concrete in the inclined prefabricated steel pile 2 reaches 70% of the design strength, integrally pouring the top end of the foundation pit enclosure structure and the top end of the inclined prefabricated steel pile 2 into a pile top crown beam;
step eight: and after the strength grade of the concrete in the pile top crown beam reaches 70% of the designed strength, finishing the construction of the foundation pit supporting system of the inclined prefabricated steel pile, and excavating the soil body in the foundation pit.
The concrete strength grade in the oblique prefabricated steel pile 2 reaches 70% of the design strength of the on-site judgment method reference:
1) a test block method: during construction, mixed concrete is poured into a specified cubic test mould, is formed by vibration or tamping, is maintained for 28 days according to specified temperature and humidity, is subjected to a pressure test strength test, and is evaluated to meet the requirement of designed strength according to the requirement in the concrete strength evaluation standard by taking a 150mm cubic test piece as a standard piece.
2) And (3) performing ultrasonic detection on the prefabricated steel pile concrete: three sound measuring tubes are embedded in each prefabricated steel pile before concrete is poured, the sound measuring tubes are arranged according to an equilateral triangle, the sound measuring tubes are parallel, welding points are arranged at intervals of 2 meters in the length direction and are firmly welded with the prefabricated steel pile, the embedding depth of the tubes is flush with the pile bottom, the bottom tubes are sealed by screw heads at 50 millimeters of the tube bottom, the upper ends of the tubes are 300-500 mm higher than the top surface of the prefabricated steel pile, the exposed heights of the sound measuring tubes of the same pile are preferably the same, the connection among the detection tubes is tight, and the concrete is prevented from blocking when entering the pile.
Examples
The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The case is located in Shanghai city, and the area of the foundation pit is 17801.28m2The perimeter of the foundation pit is 517.25m, the excavation depth of the foundation pit is 5.85m, and as shown in fig. 3, two enclosure design schemes are designed aiming at the foundation pit: the method comprises the steps of inner support supporting and oblique prefabricated concrete square pile supporting, wherein the oblique prefabricated concrete square pile scheme is finally determined by analyzing and comparing the deformation of foundation pit enclosure structures and the cost per linear meter of the foundation pit enclosure structures of two enclosure design schemes, in the actual construction process, the construction operation range of an oblique pile driving machine requires that the distance between the excavation side line of the foundation pit and the ground red line is at least 5m, a designer does not give attention to the construction operation range of the oblique pile driving machine, so that the distance between the excavation side line of the foundation pit and the ground red line is inconsistent, a certain amount of foundation pit enclosure design scheme modification is caused by the fact that a part of the oblique prefabricated concrete square pile foundation pit scheme cannot be normally constructed, and in order to avoid large modification of the foundation pit scheme, an oblique prefabricated steel pile foundation pit supporting system is adopted for the position where the distance between the excavation side line of the foundation pit and the ground red line is less than 5 m.
The slant prefabricated steel pile foundation pit supporting system is composed of a foundation pit support structure 1, slant prefabricated steel piles 2, pile top crown beams 3 and recycled concrete 4. The top end of the foundation pit support structure 1 and the top end of the inclined prefabricated steel pile 2 are poured in the pile top crown beam 3; the slant prefabricated steel pile 2 is filled with the recycled concrete 4, the lower end of the slant prefabricated steel pile is arranged in the designed elevation position of the soil layer, and an acute angle is formed between the slant prefabricated steel pile 2 and the foundation pit enclosure structure 1. The lower end of the slant prefabricated steel pile 2 is sealed by a sealing steel plate 5, and a certain number of through holes are reserved on the sealing steel plate 5. The inclined prefabricated steel piles 2 are arranged in a plurality of numbers at intervals along the length direction of the foundation pit support structure 1.
The construction method of the inclined prefabricated steel pile foundation pit supporting system adopts the supporting system and adopts the following construction steps:
according to the foundation pit stability checking calculation, the building envelope bearing capacity and deformation calculation, the component bearing capacity checking calculation, the rainfall requirement, the earthwork excavation technical requirement, the detection requirement and the monitoring requirement, the size of the oblique prefabricated steel pile 2 meeting the pile foundation bearing capacity design value requirement, the distance between the adjacent oblique prefabricated steel piles 2 and the number of the oblique prefabricated steel piles 2 needing to be installed are obtained, a real sample is released according to a construction drawing on a construction site, and the prefabricated single steel piles are stacked to a position convenient for construction after entering a field for checking and accepting; and then constructing a foundation pit enclosure structure 1 at a position 1000mm behind an excavation side line of the foundation pit, wherein the foundation pit enclosure structure 1 adopts a phi 700@2000 five-axis cement soil mixing pile, H-shaped steel is inserted into the mixing pile at intervals, and the type of the H-shaped steel is H500 multiplied by 300 multiplied by 11 multiplied by 18.
After the construction of the foundation pit support structure 1 is completed, a prefabricated single steel pile with the length of 6m is connected into an inclined prefabricated steel pile 2 with the length of 32m by welding according to the construction design length requirement, the cross section of the prefabricated single steel pile is 300mm multiplied by 300mm square, the bottom end of the inclined prefabricated steel pile 2 is sealed by a sealing steel plate 5, and a certain number of through holes with the diameter of 50mm are reserved on the sealing steel plate 5.
Meanwhile, moving the punching pile driver to a position to be constructed, starting a power device of the punching pile driver, adjusting the construction angle of a drill bit of the punching pile driver according to a construction drawing, obliquely drilling and cutting a soil body and clearing holes at the elevation position of a pile top crown beam by the punching pile driver, hoisting the oblique prefabricated steel pile 2 and pressing the oblique prefabricated steel pile 2 to the designed elevation of the soil layer;
pouring the uniformly stirred concrete into the inclined prefabricated steel pile 2 along the pouring end 7 of the poured concrete of the inclined prefabricated steel pile 2, shifting the punching pile driver, repeating the steps, constructing the next inclined prefabricated steel pile 2 in sequence until all the prefabricated steel piles are constructed, and integrally pouring the top ends of the foundation pit support structure 1 and the inclined prefabricated steel pile 2 into the pile top crown beam 3 after the strength grade of the poured concrete 4 in the inclined prefabricated steel pile 2 reaches 70% of the designed strength. And after the strength grade of the concrete in the pile top crown beam 3 reaches 70% of the design strength, finishing the construction of the foundation pit supporting system of the oblique prefabricated steel pile, and excavating the soil body in the foundation pit.
The size of the pile top crown beam is 1100mm multiplied by 700 mm.
The utility model is applicable to the prior art where nothing is said.
Claims (8)
1. A supporting and supporting system of an inclined prefabricated steel pile foundation pit, which is firstly supported and then dug, is characterized in that the supporting and supporting system consists of a foundation pit support structure, an inclined prefabricated steel pile, a pile top crown beam and back-filling concrete; pouring the top end of the foundation pit support structure and the top end of the inclined prefabricated steel pile into a pile top crown beam; the slant prefabricated steel pile is filled with recycled concrete, the lower end of the slant prefabricated steel pile is arranged in the designed elevation of the soil layer, and an acute angle is formed between the slant prefabricated steel pile and the foundation pit enclosure structure; the lower end of the oblique prefabricated steel pile is sealed by a sealing steel plate, and a certain number of through holes are reserved on the sealing steel plate; the inclined prefabricated steel piles are arranged in a plurality of numbers at intervals along the length direction of the foundation pit support structure.
2. The system of claim 1, wherein the foundation pit enclosure is a cast-in-situ bored pile, a steel reinforced cement-soil mixed wall or a steel pipe cement-soil mixed wall.
3. The system of claim 1 or 2, wherein the foundation pit support structure is a phi 700@2000 five-axis cement soil mixing pile, the type of the H-shaped steel is H500 x 300 x 11 x 18, and one insert is inserted in the mixing pile.
4. The system of claim 1, wherein the inclined precast steel pile is disposed at an angle of 30-50 ° with respect to the foundation pit enclosure.
5. The pre-braced and post-excavated inclined prefabricated steel pile foundation pit supporting system according to claim 1, wherein the inclined prefabricated steel pile is a plurality of prefabricated single steel piles which are welded or flanged to form a whole.
6. The inclined precast steel pile foundation pit supporting system which is supported and excavated according to claim 4, wherein the length of the precast single steel pile is 6 m-18 m, the cross section of the precast single steel pile is in a circular or square shape, the diameter of the circular shape is phi 400mm, phi 500mm or phi 600mm, and the side length of the square shape is 300mm, 350mm, 400mm, 450mm, 500mm, 550mm or 600 mm.
7. The system of claim 1, wherein the diameter of the through hole of the sealing steel plate is not more than 50 mm.
8. The support system for the foundation pit of the inclined prefabricated steel pile, which is supported and excavated in sequence, as claimed in claim 1, is characterized in that the support system is arranged at a position of 800-1000 mm outside an excavation sideline of the foundation pit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110267078.XA CN113006085A (en) | 2021-03-12 | 2021-03-12 | Supporting-first-excavating foundation pit supporting system for inclined prefabricated steel piles and construction method of supporting-second-excavating foundation pit supporting system |
| CN202110267078X | 2021-03-12 |
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| CN216973425U true CN216973425U (en) | 2022-07-15 |
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| CN202110267078.XA Pending CN113006085A (en) | 2021-03-12 | 2021-03-12 | Supporting-first-excavating foundation pit supporting system for inclined prefabricated steel piles and construction method of supporting-second-excavating foundation pit supporting system |
| CN202220454138.9U Expired - Fee Related CN216973425U (en) | 2021-03-12 | 2022-02-25 | Inclined prefabricated steel pile foundation pit supporting system capable of being supported and excavated firstly |
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| CN202110267078.XA Pending CN113006085A (en) | 2021-03-12 | 2021-03-12 | Supporting-first-excavating foundation pit supporting system for inclined prefabricated steel piles and construction method of supporting-second-excavating foundation pit supporting system |
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| CN117235679A (en) * | 2023-11-15 | 2023-12-15 | 长沙金码测控科技股份有限公司 | LUCC-based tensile load and compressive load evaluation method and system for foundation pit monitoring |
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| CN101250880B (en) * | 2007-12-19 | 2010-12-08 | 中铁大桥局集团第一工程有限公司 | Method for embedding and fixing steel tube concrete pile and steel tube pile anchor |
| CN102628336B (en) * | 2012-05-07 | 2014-01-01 | 邢占东 | Construction method of batter pile construction drilling machine |
| CN104912062A (en) * | 2015-07-02 | 2015-09-16 | 广东省第四建筑工程有限公司 | Concrete pile steel pipe column continuous construction method |
| CN106013098B (en) * | 2016-07-14 | 2018-06-05 | 淮海工学院 | Miniature steel pipe pile and grouting strengthening method |
| CN107938683A (en) * | 2018-01-12 | 2018-04-20 | 上海智平基础工程有限公司 | One kind tilts pile pit supporting construction and its construction method |
| CN111287193A (en) * | 2020-02-19 | 2020-06-16 | 天津大学 | Foundation pit supporting structure utilizing steel sheet piles and concrete precast piles and supporting method thereof |
| CN112267472A (en) * | 2020-10-17 | 2021-01-26 | 江苏建院营造股份有限公司 | Construction process for foundation pit support of inclined pile of advanced mixing pile |
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