CN110835917A - Multidirectional rotary-spraying stirring straight-inclined alternating supporting structure and supporting method - Google Patents
Multidirectional rotary-spraying stirring straight-inclined alternating supporting structure and supporting method Download PDFInfo
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- CN110835917A CN110835917A CN201911011448.2A CN201911011448A CN110835917A CN 110835917 A CN110835917 A CN 110835917A CN 201911011448 A CN201911011448 A CN 201911011448A CN 110835917 A CN110835917 A CN 110835917A
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- stirring
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
Abstract
The invention discloses a multidirectional rotary-spraying stirring straight-inclined alternate supporting structure and a supporting method, wherein the multidirectional rotary-spraying stirring straight-inclined alternate supporting structure comprises filling piles and stirring piles, the filling piles are vertically embedded into the bottom surface of a foundation pit, waist beams are arranged between the filling piles, crown beams are arranged at the top ends of the filling piles, the stirring piles comprise inclined stirring piles and vertical stirring piles, the vertical stirring piles are tightly attached to the side wall of the foundation pit, connecting beams are arranged at the top ends of the vertical stirring piles, the connecting beams are connected with the crown beams, and the inclined stirring piles are arranged between the filling piles; the multidirectional rotary-spraying stirring straight-inclined alternate supporting method comprises the following steps: 1. measuring and determining building parameters, 2, drilling construction, 3, concrete pile filling construction, and 4, constructing a crown beam and a coupling beam. The invention forms the composite soil retaining structure through the straight-inclined alternate supporting structure and the supporting method, has simple and clear construction steps, effectively limits the relative movement of the slip crack surfaces of the side slope of the foundation pit, enhances the integrity of the soil body, achieves the aim of stabilizing the side slope of the foundation pit, and is suitable for various soil layers.
Description
Technical Field
The invention relates to a multidirectional rotary-spraying stirring straight-inclined alternating supporting structure and a supporting method, and belongs to the technical field of buildings.
Background
In recent years, with the continuous development of the construction industry in China, the foundation pit supporting technology is continuously innovated and improved, the jet grouting stirring stiffening pile is a novel foundation pit anchoring technology, is a novel foundation pit supporting method in recent years, and creatively combines a stirring pile and a high-pressure jet grouting pile on the basis of the characteristics of a cement soil stirring pile and the high-pressure jet grouting pile.
With the increase of the depth of a foundation pit, in order to improve the stability and the safety of the foundation pit support, the foundation pit engineering is always a major problem, and particularly in a soft soil foundation pit, in order to improve the stability of a support structure, a 3D foundation pit support is arranged through straight and inclined piles in an alternating plane mode.
Compared with a vertical pile, the inclined pile has better horizontal bearing capacity, is applied to practical engineering, is suitable for various soil layers by being alternately matched with the vertical pile, and is superior to the traditional supporting technology in the aspects of safety, economy, construction convenience and the like.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a multidirectional rotary-spraying stirring straight-inclined alternating supporting structure and a supporting method.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a multidirectional stirring of spouting soon is alternative supporting construction to one side, includes bored concrete pile and stirring stake, the vertical embedding foundation ditch bottom surface of bored concrete pile is provided with the waist rail between the bored concrete pile, and the bored concrete pile top is provided with guan lian, the stirring stake is including slope stirring stake and vertical stirring stake, the foundation ditch lateral wall is hugged closely to vertical stirring stake, and vertical stirring stake top is provided with even roof beam, even roof beam and guan lian are connected, slope stirring stake is installed between the bored concrete pile.
Furthermore, the upper end surface of the crown beam is flush with the ground surface, and the crown beam is connected with a row of cast-in-place piles.
Furthermore, the inclined stirring piles are obliquely inserted downwards into the side wall of the foundation pit, and pile heads at the ends, inserted into the side wall, of the inclined stirring piles are expanded heads.
A multidirectional rotary-spraying stirring straight-inclined alternate supporting method comprises the following steps:
the method comprises the following steps: measuring and determining building parameters: digging a groove, measuring elevation, making a position installation mark, and determining the mixing proportion of cement slurry;
step two: drilling construction: moving the mixing pile machine to a calibrated punching position, checking the inclination angle of the drill rod, setting the rotation speed of the drill rod, and drilling to a designed depth;
step three: and (3) concrete pile grouting construction: and pouring concrete at the hole forming position to form a poured pile and a stirring pile, and applying a reinforcement cage and anchor bars in the pouring process.
Step four: constructing a crown beam and a coupling beam: and respectively constructing a crown beam and a connecting beam at the top end of the cast-in-place pile and the top end of the vertical stiffening pile.
Furthermore, in the first step, 42.5-grade ordinary portland cement is adopted as the cement slurry, the cement mixing amount is 25%, and the water cement ratio is 0.70.
Furthermore, the deviation of the inclination angle of the drill rod in the second step is not more than 3 degrees, the height difference is not more than 5cm, the drilling speed of the stirring drill rod is 0.7-1.0m/min, the withdrawal speed is 1.0-1.2m/min, and the rotation speed of the stirring drill rod is 20-50 r/min.
And step three, the stiffening pile is coaxially provided with anchor bars inside, each anchor bar comprises an anchor head, and steel strands are arranged inside the anchor heads.
Has the advantages that:
the foundation pit is alternately and planarly arranged through the straight and inclined stirring piles to replace the inner support, so that the manufacturing cost of the enclosure structure is reduced, the operation space in the foundation pit is increased, the construction operation condition is improved, the lateral displacement of the supporting structure is effectively controlled, the diameter-enlarged pile head inclined pile formed by construction can effectively increase the uplift resistance; the stability of foundation pit support is improved, and the method is suitable for various soil layers.
Drawings
Figure 1 is a schematic structural view of the present invention,
figure 2 is a cross-sectional view a-a of figure 1,
wherein, the method comprises the following steps of 1-connecting beam, 2-crown beam, 3-cast-in-place pile, 4-inclined stirring pile, 5-steel strand, 6-vertical stirring pile and 7-waist beam.
Detailed Description
The present invention is further illustrated by the following figures and specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.
Multidirectional stirring straight skew alternative supporting construction that spouts soon, including bored concrete pile 3 and stirring stake, it fills to be provided with waist rail 7 between 3, the vertical embedding foundation ditch bottom surface of bored concrete pile 3, 3 tops of bored concrete pile are provided with guan liang 2, guan liang 2 up end flushes with the ground surface, the stirring stake includes vertical stirring stake 6 and slope stirring stake 4, foundation ditch lateral wall is hugged closely to vertical stirring stake 6, vertical stirring stake 6 upper end is provided with even roof beam 1 of being connected with guan liang 2, slope stirring stake 4 slope is installed between two bored concrete piles 3.
The construction constructor adopts a stirring pile with the diameter of 600mm, the stirring pile adopts 42.5-grade ordinary portland cement, the cement doping amount is 25 percent, the water cement ratio is 0.70, the pressure of rotary spraying stirring is between 15Mpa and 20Mpa, wherein the water cement ratio can be properly adjusted according to the condition of an on-site soil layer, the drilling of a drilling rod of the stirring pile is firstly checked, the deviation of the drilling angle is not more than 3 degrees, and the height difference is not more than 5 cm. The anchor bars in the mixing pile are made of 4 steel strands 5 with the diameter of 15.2, the locking tension of each steel strand 5 is 90KN, the strength standard value of the steel strands reaches 1860Mpa, the length of the anchor bars is the sum of the lengths of the stiffening pile and the enclosure wall, and the length outside the reserved waist beam 7 is not less than 1 m. When the strength of the crown beam 2 and the stiffening pile reaches seventy percent of the design strength, the steel strand 5 is locked on the waist beam 7 by an anchorage device, wherein the waist beam 7 is welded with an iron plate into a whole by 2 pieces of 25a I-steel, the waist beam 7 is tightly attached to the vertical cast-in-place pile 3, a gasket of 240 multiplied by 20 is used between the anchorage device and the waist beam 7, the anchorage device adopts QVM series and consists of an anchor head and an anchor disc, and the anchor head is fixed with the anchor disc by a cold extrusion method.
The constructor firstly drills a hole, the drilling speed of the stirring drill rod is 0.7-1.0m/min, the withdrawing speed is 1.0-1.2m/min, the error is not more than +/-10 cm/min, and the rotating speed of the stirring drill rod is 20-50 r/min. Pouring cast-in-place pile 3 and stirring pile in the drilled cavity, wherein cast-in-place pile 3 and vertical stirring pile 6 are connected through connecting beam 1 in an overlapping mode, the depth of the bottom surface of a foundation pit, where cast-in-place pile 3 and vertical stirring pile 6 are embedded, is about two fifths of the pile length, each inclined stirring pile 4 is poured between every two adjacent cast-in-place piles 3, inclined stirring piles 4 and vertical stirring piles 6 are alternately supported, a row of cast-in-place pile 3 top ends are pouring crown beam 2, and finally, QVM series of anchors are adopted to lock and fix vertical stirring pile 6 and inclined stirring pile 4 on waist beam 7 to complete supporting.
According to the invention, through the straight-inclined alternate supporting structure and the supporting method, the construction is simple and clear, the operability is strong, a composite soil retaining structure is formed, the relative movement of the side slope sliding crack surface of the foundation pit is effectively limited, the straight-inclined alternate stirring piles replace the inner supports, the manufacturing cost of the enclosure structure is reduced, the operation space in the foundation pit is improved, the construction operation condition is improved, the lateral displacement of the supporting structure is effectively controlled, and the diameter-enlarged pile head inclined pile formed by construction can effectively increase the uplift resistance; the integrity of the soil body is enhanced, and the aim of stabilizing the side slope of the foundation pit is fulfilled.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a multidirectional stirring straight skew alternative supporting construction that spouts soon which characterized in that: including bored concrete pile (3) and stirring stake, the vertical embedding foundation ditch bottom surface of lower extreme of bored concrete pile (3) is provided with waist rail (7) between bored concrete pile (3), and bored concrete pile (3) top is provided with guan liang (2), the stirring stake is including slope stirring stake (4) and vertical stirring stake (6), the foundation ditch lateral wall is hugged closely in vertical stirring stake (6), and vertical stirring stake (6) top is provided with even roof beam (1), even roof beam (1) is connected with guan liang (2), slope stirring stake (4) are installed between bored concrete pile (3).
2. The utility model provides a multidirectional stirring straight skew alternative supporting construction that spouts soon which characterized in that: the upper end surface of the crown beam (2) is flush with the ground surface, and the crown beam (2) is connected with a row of cast-in-place piles.
3. The utility model provides a multidirectional stirring straight skew alternative supporting construction that spouts soon which characterized in that: the inclined stirring piles (4) are obliquely and downwards inserted into the side wall of the foundation pit, and the pile heads of the inclined stirring piles (4) inserted into the end of the side wall are enlarged heads.
4. A multidirectional rotary-spraying stirring straight-inclined alternate supporting method is characterized in that: the method comprises the following steps:
the method comprises the following steps: measuring and determining building parameters: digging a groove, measuring elevation, making a position installation mark, and determining the mixing proportion of cement slurry;
step two: drilling construction: moving the mixing pile machine to a calibrated punching position, checking the inclination angle of the drill rod, setting the rotation speed of the drill rod, and drilling to a designed depth;
step three: and (3) concrete pile grouting construction: pouring concrete at the hole forming position to form a pouring pile (3) and a stirring pile, and applying a reinforcement cage and anchor bars in the pouring process;
step four: constructing a crown beam and a coupling beam: the top end of the filling pile (3) and the top end of the vertical stiffening pile (6) are respectively provided with a crown beam (2) and a coupling beam (1).
5. The multidirectional rotary-spraying stirring straight-inclined alternating supporting method according to claim 4, characterized in that: in the first step, the cement slurry adopts 42.5-grade ordinary portland cement, the cement mixing amount is 25%, and the water cement ratio is 0.70.
6. The multidirectional rotary-spraying stirring straight-inclined alternating supporting method according to claim 4, characterized in that: and in the second step, the deviation of the inclination angle of the drill rod is not more than 3 degrees, the height difference is not more than 5cm, the drilling speed of the stirring drill rod is 0.7-1.0m/min, the withdrawal speed is 1.0-1.2m/min, and the rotating speed of the stirring drill rod is 20-50 r/min.
7. The multidirectional rotary-spraying stirring straight-inclined alternating supporting method according to claim 4, characterized in that: and step three, anchor bars are coaxially arranged in the stiffening piles and comprise anchor heads, and steel strands (5) are arranged in the anchor heads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911011448.2A CN110835917A (en) | 2019-10-23 | 2019-10-23 | Multidirectional rotary-spraying stirring straight-inclined alternating supporting structure and supporting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911011448.2A CN110835917A (en) | 2019-10-23 | 2019-10-23 | Multidirectional rotary-spraying stirring straight-inclined alternating supporting structure and supporting method |
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| Publication Number | Publication Date |
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| CN110835917A true CN110835917A (en) | 2020-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911011448.2A Withdrawn CN110835917A (en) | 2019-10-23 | 2019-10-23 | Multidirectional rotary-spraying stirring straight-inclined alternating supporting structure and supporting method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233689A (en) * | 2022-07-04 | 2022-10-25 | 浙江工业大学 | Combined type enclosure structure for soft soil foundation pit and construction method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518135A (en) * | 2011-12-29 | 2012-06-27 | 标力建设集团有限公司 | Foundation pit support construction method combining horizontal rotary jet-grouting soil bolting and bore concrete piles |
| CN103898916A (en) * | 2014-04-09 | 2014-07-02 | 浙江理工大学 | Mini-pile combined support structure and construction method thereof |
| CN204645057U (en) * | 2014-12-31 | 2015-09-16 | 云南建工基础工程有限责任公司 | A kind of pile body is provided with the Double-row-piles Structure adding the stake of core horizontal jet grouting |
| CN205348195U (en) * | 2016-01-11 | 2016-06-29 | 浙江宝业建设集团有限公司 | Anchor rope spouts supporting construction that anchor double row pile was drawn in stake soon |
| WO2018009958A1 (en) * | 2016-07-15 | 2018-01-18 | Mark Robert Edmund Curtis | Precast concrete panels used as surface lining of perimeter surfaces of excavations |
| CN109162281A (en) * | 2018-09-05 | 2019-01-08 | 江苏兴厦建设工程集团有限公司 | A kind of more anchor disk jet mixing stiffening piles |
-
2019
- 2019-10-23 CN CN201911011448.2A patent/CN110835917A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518135A (en) * | 2011-12-29 | 2012-06-27 | 标力建设集团有限公司 | Foundation pit support construction method combining horizontal rotary jet-grouting soil bolting and bore concrete piles |
| CN103898916A (en) * | 2014-04-09 | 2014-07-02 | 浙江理工大学 | Mini-pile combined support structure and construction method thereof |
| CN204645057U (en) * | 2014-12-31 | 2015-09-16 | 云南建工基础工程有限责任公司 | A kind of pile body is provided with the Double-row-piles Structure adding the stake of core horizontal jet grouting |
| CN205348195U (en) * | 2016-01-11 | 2016-06-29 | 浙江宝业建设集团有限公司 | Anchor rope spouts supporting construction that anchor double row pile was drawn in stake soon |
| WO2018009958A1 (en) * | 2016-07-15 | 2018-01-18 | Mark Robert Edmund Curtis | Precast concrete panels used as surface lining of perimeter surfaces of excavations |
| CN109162281A (en) * | 2018-09-05 | 2019-01-08 | 江苏兴厦建设工程集团有限公司 | A kind of more anchor disk jet mixing stiffening piles |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233689A (en) * | 2022-07-04 | 2022-10-25 | 浙江工业大学 | Combined type enclosure structure for soft soil foundation pit and construction method thereof |
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Application publication date: 20200225 |