CN106677192A - Row pile anchoring cement soil pile continuous wall supporting structure and construction process thereof - Google Patents
Row pile anchoring cement soil pile continuous wall supporting structure and construction process thereof Download PDFInfo
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- CN106677192A CN106677192A CN201710123055.5A CN201710123055A CN106677192A CN 106677192 A CN106677192 A CN 106677192A CN 201710123055 A CN201710123055 A CN 201710123055A CN 106677192 A CN106677192 A CN 106677192A
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- Prior art keywords
- anchor
- campshed
- cement
- diaphragm wall
- earth pile
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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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a row pile anchoring cement soil pile continuous wall supporting structure. The row pile anchoring cement soil pile continuous wall supporting structure comprises a concrete pavement, row piles, a total-length bonding anchor rod and a single row of cement soil pile continuous wall or multiple rows of cement soil pile continuous walls; the concrete pavement is arranged along the side wall of a foundation trench, and the row piles are close to the concrete pavement to be arranged in the side wall of the foundation trench; and the total-length bonding anchor rod is arranged between the row piles, the front end of the total-length bonding anchor rod is fixed to the concrete pavement through an anchor plate or a prestress locking device, and the tail end of the total-length bonding anchor rod is inserted into the cement soil pile continuous wall/cement soil pile continuous walls in a downwards-inclined manner. According to the supporting structure, the total-length bonding anchor rod is adopted, a stress mechanism is similar to that of a soil nail, and the axial force is small in two ends and large in middle in the length direction, and therefore the axial force of the ends of the anchor rod in the supporting structure is small, and the force transmission effect can be achieved only by arranging the small anchor plate and being in cooperation with the concrete pavement.
Description
Technical field
The present invention relates to Base hole supporting technology field, and in particular to a kind of campshed anchor draws cement earth pile diaphragm wall supporting construction
And its construction technology.
Background technology
When foundation ditch is deeper, when circumferentially descending narrow space such as periphery to there is basement, subway tunnel etc., adoptable supporting
Scheme has：Campshed+wide-angle prestressed anchor supporting, campshed inner support supporting, diaphragm wall inner support supporting.
Wherein, campshed+wide-angle prestressed anchor supporting closes on building, structures, employs big angle to avoid anchor pole
Degree anchor pole, the anchor axial force of this kind of support form is larger, and length is longer, anchor pole to the contribution of equilibrium level direction soil pressure compared with
It is little, cause larger waste.
Campshed or diaphragm wall inner support supporting construction difficulty are high, and cost is high, and affect larger to the construction period.
The content of the invention
It is an object of the invention to provide a kind of campshed anchor draws cement earth pile diaphragm wall supporting construction, while providing its construction
Technique is the another goal of the invention of the present invention.
For achieving the above object, the present invention is employed the following technical solutions：
A kind of campshed anchor draws cement earth pile diaphragm wall supporting construction, including concrete topping, campshed, whole-length cohesive anchor bolt and single
Or multiple rows of cement earth pile diaphragm wall, along foundation pit side-wall setting, the campshed is near concrete topping setting for the concrete topping
In foundation pit side-wall；The whole-length cohesive anchor bolt is arranged between campshed, and the front end of whole-length cohesive anchor bolt is answered by anchor slab and in advance
Power locking device is fixed on concrete topping, and the downward-sloping insertion cement earth pile of tail end of whole-length cohesive anchor bolt is continuous within the walls.Institute
State whole-length cohesive anchor bolt row and calculated according to foundation depth and geological conditions and determine.
The thickness of the concrete topping is not less than 100mm, and interior with two-way concrete slab net.
The end of the whole-length cohesive anchor bolt arranges the two-way reinforcement positioned at concrete topping.
The cement earth pile diaphragm wall is occlusal pattern high-pressure rotary jet grouting pile, cement mixing method or soil cement bored concrete pile.
Anchorage point of the whole-length cohesive anchor bolt on cement-soil pile is located in the range of foundation ditch lateral stabilization soil layer.
Described campshed anchor draws the construction technology of cement earth pile diaphragm wall supporting construction, comprises the following steps：
1）Construction campshed, cement earth pile diaphragm wall；
2）Excavate one layer of earthwork；
3）Construct row's whole-length cohesive anchor bolt；It is continuous within the walls that whole-length cohesive anchor bolt tail end anchors into cement earth pile；
4）Repeat step 2）With 3）, until being excavated to substrate.
Cement earth pile diaphragm wall intensity is no less than 5MPa.
This supporting construction is by campshed, single row or multiple rows cement earth pile diaphragm wall, the coagulation by being arranged on the inside of campshed
Native surface layer, whole-length cohesive anchor bolt carry out forming " trapezoidal " section supporting construction after drawknot.Cement earth pile diaphragm wall is generally positioned at
It is assumed that beyond the plane of fracture, whole-length cohesive anchor bolt tail end is anchored in cement earth pile within the walls, the supporting construction is particularly suitable for depth in 15m
Left and right, circumferentially descends narrow space such as periphery to there is the base pit engineering of basement, subway tunnel etc..
Compared with prior art, beneficial effects of the present invention are：
1st, anchor pole is the prestressed anchor for having free segment in existing piled anchor structure, and rockbolt stress maximum is located at free segment one end,
Therefore piled anchor structure end needs to be separately provided breast beam structure as the force transferring structure between campshed and anchor pole；In this supporting construction, adopt
With whole-length cohesive anchor bolt, mechanical behavior similar to soil nailing, axle power along its length " small in ends, broad in the middle ", thus supporting construction
In anchor pole end axle power it is less, less anchor slab is only set and intermal force is can reach with reference to concrete topping；
2nd, campshed stake footpath and arrangement of reinforcement are less compared with piled anchor structure.Because anchor pole end stress is less in this supporting construction, according to campshed-
Calculation of bolts model, fulcrum power（Anchor pole end axle power）Become hour, the maximal bending moment of campshed will reduce, therefore campshed arrangement of reinforcement and diameter
Reduce therewith；
3rd, the compound whole-length cohesive anchor bolt supporting construction force-mechanism of campshed is similar with campshed composite soil nailed wall, needs to arrange
Multiple rows of anchor structure, compared with common piled anchor structure, anchor pole row increases, but length and diameter are less；
4th, common piled anchor structural anchor bar is anchored in the foundation ditch lateral stabilization soil body, therefore length is longer, and the present invention is anchor rod anchored in water
In soil piling wall, cement-soil pile can provide larger and relatively stable collateral resistance, thus, rock-bolt length can be shortened significantly.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the structural representation of whole-length cohesive anchor bolt and its end.
Fig. 3 is the structural representation of concrete topping arrangement of reinforcement.
Specific embodiment
Embodiment 1
Foundation depth 15m, foundation ditch outside there are 2 layers of basement 6.It is designed with campshed anchor and draws cement earth pile diaphragm wall supporting knot
Structure, as shown in Figure 1, 2, 3, including concrete topping 3, campshed 1, whole-length cohesive anchor bolt 2 and single row or multiple rows cement earth pile are continuous
Wall 5, the concrete topping 3 is arranged along foundation pit side-wall, and the thickness 100mm of concrete topping 3 is interior with two-way A8 reinforcing bars 8, spacing
200mm, the campshed 1 is concrete piling 1, is arranged in foundation pit side-wall near concrete topping 3, the diameter 800mm of campshed 1,
The long 25m of stake, spacing 1.5m；Campshed and axle center spacing 7.5m of cement earth pile diaphragm wall 5.
The whole-length cohesive anchor bolt 2, vertically arranged 4 row, length is 8m, diameter 150mm, and 15 ° of inclination angle is often arranged total length and glued
The knot interval setting of anchor pole 2, spacing 1.5m；The arrangement of reinforcement of whole-length cohesive anchor bolt 2 is the regular screw threads reinforcing bar of 1 diameter 25mm, note
Pulp material is plain-water slurry, and using secondary grouting technique；The front end of the whole-length cohesive anchor bolt 2 is by anchor slab 4 and prestressing force
Locking device 7 is fixed on concrete topping 3, in the downward-sloping insertion cement earth pile diaphragm wall 5 of tail end of whole-length cohesive anchor bolt 2；
Anchorage point of the whole-length cohesive anchor bolt on cement-soil pile is located in the range of foundation ditch lateral stabilization soil layer.
The cement earth pile diaphragm wall 5, is double D500 high-pressure rotary jet grouting piles, and 150mm, the long 18m of stake are engaged between stake；The anchor
Plate 4, size is 200 × 200mm, thickness 20mm；The end of the whole-length cohesive anchor bolt 2 is arranged positioned at the vertical of concrete topping 3
To and horizontal each 2 B14 reinforcements 9.
The construction technology of above-mentioned supporting construction, comprises the following steps：
1）The construction continuous piling wall 5 of campshed 1, soil cement, the continuous piling wall 5 of the soil cement is high-pressure rotary jet grouting pile；
Construction campshed 1 and high-pressure rotary jet grouting pile before excavation of foundation pit, are the impact for reducing pile driving construction to surrounding enviroment, and two kinds of pile-type are applied
Should stagger between man-hour.The single cement consumption 160kg/m of the high-pressure rotary jet grouting pile, the ratio of mud determines according to soil layer experimental result,
Desirable 0.8~1.0, it is ensured that high-pressure rotary jet grouting pile intensity is no less than 5MPa.Office is broken after campshed concrete reaches design strength
Portion's pile crown, construction stake apical cap beam, Guan Liang concrete strength C30, size is 900mm × 500mm.Guan Liang effect predominantly strengthens row
The globality of stake, is not main bearing member.
2）Excavate one layer of earthwork；
After Guan Liang construction is completed and reaches design strength, the excavation pit upper strata earthwork, excavation face absolute altitude control is complete in first row
500mm below the anchor head position of long Grouted bolt 2, for anchor bolt construction condition is provided.
Timely gunite concrete surface layer, concrete topping thickness 100mm, should divide 2 layers to be sprayed, surface layer after earth excavation
It is interior to lay after a layer concrete is sprayed with bar-mat reinforcement, the 2nd layer concrete is sprayed after the completion of laying.
3）Construct row's whole-length cohesive anchor bolt 2；The tail end of whole-length cohesive anchor bolt 2 is anchored in cement soil continuous wall；
Whole-length cohesive anchor bolt aperture 150mm, construction adopts secondary pressure slurry injection technique, default secondary grouting pipe, slip casting before construction
Hole should have non-return device.Injecting paste material is plain-water slurry, and cement adopts P.O42.5 levels, and the ratio of mud is 0.5, and cement consumption is many
In 50kg/m.The secondary pressure grouting time should at once be carried out after the cement mortar initial set of first time perfusion, and grouting pressure is not
Less than 2MPa.
Prestressed anchor tensioning should can carry out opening after 75% that anchorage body intensity reaches 15MPa or design strength
Zip is determined.Tensioning stop value is design ultimate bearing capacity, is retreated to locking design load locking, and grading tension is answered in tensioning.48h after locking
It is interior, tensioning should be compensated when stress loss is more than 10%.Anchor pole end arranges anchor slab, anchorage, and anchor pole is locked in by anchorage
On anchor slab, anchor slab is close on concrete topping.
4）Repeat step 2）With 3）, until being excavated to substrate.
It is laggard that every layer of earth excavation should reach design requirement in upper row anchorage body intensity and concrete topping intensity
OK, and cutting depth is not to be exceeded 500mm below this layer of anchor pole position.
Claims (7)
1. a kind of campshed anchor draws cement earth pile diaphragm wall supporting construction, it is characterised in that including concrete topping, campshed, total length
Grouted bolt and single row or multiple rows cement earth pile diaphragm wall, the concrete topping is arranged along foundation pit side-wall, and the campshed is close
Concrete topping is arranged in foundation pit side-wall；The whole-length cohesive anchor bolt is arranged between campshed, the front end of whole-length cohesive anchor bolt
Concrete topping, the downward-sloping insertion soil cement of tail end of whole-length cohesive anchor bolt are fixed on by anchor slab and prestressing force locking device
Stake is continuous within the walls.
2. campshed anchor as claimed in claim 1 draws cement earth pile diaphragm wall supporting construction, it is characterised in that the concrete surface
The thickness of layer is not less than 100mm, and interior with two-way concrete slab net.
3. campshed anchor as claimed in claim 1 draws cement earth pile diaphragm wall supporting construction, it is characterised in that the total length bonding
The end of anchor pole arranges the two-way reinforcement positioned at concrete topping.
4. campshed anchor as claimed in claim 1 draws cement earth pile diaphragm wall supporting construction, it is characterised in that the cement earth pile
Diaphragm wall is occlusal pattern high-pressure rotary jet grouting pile, cement mixing method or soil cement bored concrete pile.
5. campshed anchor as claimed in claim 1 draws cement earth pile diaphragm wall supporting construction, it is characterised in that the total length bonding
Anchorage point of the anchor pole on cement-soil pile is located in the range of foundation ditch lateral stabilization soil layer.
6. the campshed anchor described in claim 1 draws the construction technology of cement earth pile diaphragm wall supporting construction, it is characterised in that include
Following steps：
1）Construction campshed, cement earth pile diaphragm wall；
2）Excavate one layer of earthwork；
3）Construct row's whole-length cohesive anchor bolt；It is continuous within the walls that whole-length cohesive anchor bolt tail end anchors into cement earth pile；
4）Repeat step 2）With 3）, until being excavated to substrate.
7. the campshed anchor described in claim 6 draws the construction technology of cement earth pile diaphragm wall supporting construction, it is characterised in that cement
Native stake diaphragm wall intensity is no less than 5MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710123055.5A CN106677192A (en) | 2017-03-03 | 2017-03-03 | Row pile anchoring cement soil pile continuous wall supporting structure and construction process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710123055.5A CN106677192A (en) | 2017-03-03 | 2017-03-03 | Row pile anchoring cement soil pile continuous wall supporting structure and construction process thereof |
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| CN106677192A true CN106677192A (en) | 2017-05-17 |
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| CN201710123055.5A Pending CN106677192A (en) | 2017-03-03 | 2017-03-03 | Row pile anchoring cement soil pile continuous wall supporting structure and construction process thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108301400A (en) * | 2018-01-26 | 2018-07-20 | 重庆交通大学 | Hollow draining anchor draws friction pile and its construction method |
| CN108642986A (en) * | 2018-07-25 | 2018-10-12 | 辽宁工程技术大学 | A kind of anchor cable structure and construction method of control part cut and part fill section settlement of subgrade |
| CN108914947A (en) * | 2018-09-19 | 2018-11-30 | 山东倍特力地基工程技术有限公司 | Foundation pit anchor wall draws the construction method of anchor supporting and its supporting construction of drilling tool and formation |
| CN111118967A (en) * | 2019-12-30 | 2020-05-08 | 中铁第六勘察设计院集团有限公司 | Construction method for filling foam light soil foundation pit of railway roadbed in soft soil area |
| CN112211199A (en) * | 2020-04-06 | 2021-01-12 | 广东华星建设集团有限公司 | Large deep foundation pit supporting construction structure and method thereof |
| CN114059557A (en) * | 2021-12-15 | 2022-02-18 | 中国电建集团北京勘测设计研究院有限公司 | Excavation supporting method for vertical side slope of foundation pit of hydropower station with deep covering layer |
| CN115198762A (en) * | 2022-07-22 | 2022-10-18 | 中建一局集团第二建筑有限公司 | Supporting structure next to existing building foundation pit and construction method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108301400A (en) * | 2018-01-26 | 2018-07-20 | 重庆交通大学 | Hollow draining anchor draws friction pile and its construction method |
| CN108642986A (en) * | 2018-07-25 | 2018-10-12 | 辽宁工程技术大学 | A kind of anchor cable structure and construction method of control part cut and part fill section settlement of subgrade |
| CN108642986B (en) * | 2018-07-25 | 2023-11-07 | 辽宁工程技术大学 | Anchor cable structure for controlling uneven settlement of half-dike half-cut base and construction method |
| CN108914947A (en) * | 2018-09-19 | 2018-11-30 | 山东倍特力地基工程技术有限公司 | Foundation pit anchor wall draws the construction method of anchor supporting and its supporting construction of drilling tool and formation |
| CN111118967A (en) * | 2019-12-30 | 2020-05-08 | 中铁第六勘察设计院集团有限公司 | Construction method for filling foam light soil foundation pit of railway roadbed in soft soil area |
| CN112211199A (en) * | 2020-04-06 | 2021-01-12 | 广东华星建设集团有限公司 | Large deep foundation pit supporting construction structure and method thereof |
| CN114059557A (en) * | 2021-12-15 | 2022-02-18 | 中国电建集团北京勘测设计研究院有限公司 | Excavation supporting method for vertical side slope of foundation pit of hydropower station with deep covering layer |
| CN115198762A (en) * | 2022-07-22 | 2022-10-18 | 中建一局集团第二建筑有限公司 | Supporting structure next to existing building foundation pit and construction method thereof |
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Application publication date: 20170517 |
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