CN110374111A - A kind of slope cooperates with support system with steel pipe piled anchor - Google Patents
A kind of slope cooperates with support system with steel pipe piled anchor Download PDFInfo
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- CN110374111A CN110374111A CN201910668134.3A CN201910668134A CN110374111A CN 110374111 A CN110374111 A CN 110374111A CN 201910668134 A CN201910668134 A CN 201910668134A CN 110374111 A CN110374111 A CN 110374111A
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- slope
- steel
- crown beam
- foundation pit
- anchor
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 66
- 239000010959 steel Substances 0.000 title claims abstract description 66
- 239000004567 concrete Substances 0.000 claims abstract description 38
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 239000010865 sewage Substances 0.000 claims abstract description 7
- 239000002689 soil Substances 0.000 claims description 41
- 230000003014 reinforcing effect Effects 0.000 claims description 18
- 238000007569 slipcasting Methods 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 230000009545 invasion Effects 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 abstract description 11
- 239000004927 clay Substances 0.000 abstract description 4
- 239000004576 sand Substances 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 238000003776 cleavage reaction Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 7
- 230000007017 scission Effects 0.000 description 7
- 239000002002 slurry Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
-
- 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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/32—Safety or protective measures for persons during the construction of buildings
- E04G21/3204—Safety or protective measures for persons during the construction of buildings against falling down
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The invention discloses a kind of slopes to cooperate with support system with steel pipe piled anchor, which includes guardrail, steel floral tube, 50mm thickness concrete, driving into type earth anchor, joint bar, crown beam, prestress anchorage cable, 100mm thickness concrete, steel-pipe pile, foundation pit interior main body structure, sewage pipe, monitoring point and dewatering well.The present invention can effectively control deep basal pit vertical deformation and horizontal displacement in the stratum such as miscellaneous fill, silt and silty clay, medium coarse sand, be effectively reduced earth excavation project amount, project cost greatly reduces.Entire support system specifically successively includes slope section and piled anchor section from nature terrace to foundation pit bottom surface.Increase vertical anchored pile supporting in slope foot position on the basis of slope is excavated, reduces foundation pit slope range.To solve the problems, such as that volume of earthwork brought by support pattern of the deep foundation pit support only with foundation pit slope is big, cost is high.
Description
Technical field
The present invention relates to deep foundation pit support field, especially a kind of slope cooperates with support system with steel pipe piled anchor.
Background technique
It is the biggish part-to-item project of risk more than the earth excavation of certain depth and pattern foundation pit supporting structure itself, with
Being continuously increased for excavation of foundation pit depth, also higher and higher to supporting construction stability and security requirement accordingly, foundation pit open
Earth excavation project amount and cost are consequently increased.I.e. how under the premise of guaranteeing that deep pit monitor is stablized, excavation of foundation pit soil is reduced
Square project amount reduces the project cost of excavation of foundation pit and supporting.Therefore reasonable support system type selecting is just particularly important.
Supporting construction type selecting will consider factors, such as foundation depth, the character of soil and groundwater condition, foundation pit periphery
Consequence, main body underground structure and base form and construction party of the environment to ability to bear and the supporting construction failure of foundation pit deformation
Method, foundation pit planar dimension and shape, the feasibility of support construction technique, economic indicator, environmental-protecting performance and construction period etc.
Etc. factors, it is that two different support systems are carried out one effective group that support system is cooperateed with steel pipe piled anchor using a kind of slope
The form of conjunction.
In large-scale excavation of foundation pit and support engineering, in the case where meeting natural discharging slope requirement, excavated using slope
Mode itself is technically simple, and safety is higher, but volume of earthwork is larger, has greater environmental impacts and corresponding project cost
It is higher, and cooperate with support system that can effectively less earth excavation project amount, guarantee foundation pit pacify with steel pipe piled anchor using slope
It is complete and stable.
Summary of the invention
The present invention provides a kind of slope and cooperates with support system with steel pipe piled anchor, and entire support system is from nature terrace to foundation pit
Bottom surface specifically successively includes slope section and piled anchor section.Increase vertical pile-anchor retaining in slope foot position on the basis of slope is excavated
Structure reduces foundation pit slope range.To solve the earthwork brought by support pattern of the deep foundation pit support only with foundation pit slope
The problem that project amount is big, cost is high.
The technical solution adopted by the present invention to solve the technical problems is: a kind of slope cooperates with prop with steel pipe piled anchor
System, which includes guardrail 1, steel floral tube 2,50mm thickness concrete 3, driving into type earth anchor 4, joint bar 5, crown beam 6, prestressed anchor
Rope 7,100mm thickness concrete eight, steel-pipe pile 9, foundation pit interior main body structure 10, sewage pipe 11, monitoring point 12 and dewatering well 13.
The edge protection facility that guardrail 1 is arranged in as foundation pit exterior circumferential；The slope section of foundation pit is tied using multistage point slope
Structure, 2 pairs of multistages of steel floral tube divide the slope surface active earth pressure area of slope structure to carry out slip casting, to enhance the active soil that multistage divides slope structure
The soil strength and globality of pressure area；
The 50mm concrete 3 of the slope surface injection of classification, prevents classification slope surface may be by rain drop erosion；The 50mm thickness of injection is mixed
It is equipped in solidifying soil 3 and is welded with steel mesh and joint bar structure；
Driving into type earth anchor 4 is the connection structure for the slope surface reinforced mesh that multistage divides slope structure, to increase reinforced mesh and more
The slope surface of fraction slope structure and the overall adhesion of top of the slope.Joint bar 5 is consistent with the effect of driving into type earth anchor 4, is for improving
Reinforced mesh and the multistage slope surface adhesive force for dividing slope structure, reinforcing steel bar mesh sheet stability.
The effect of crown beam 6 is that the campshed for forming steel-pipe pile 9 is connected to become an entirety, while mentioning for prestressed anchor cable stretching
For a tensioning fixed base.
The lateral pressure that crown beam 6 and waist rail carry is passed to stratum by prestress anchorage cable 7, and prestress anchorage cable 7 is a power transmission
Component；
Foundation pit interior main body structure 10 is arranged among the bottom of foundation pit, and sewage pipe 11 is embedded in 10 bottom of foundation pit interior main body structure
Portion two sides；The campshed that steel-pipe pile 9 is formed is the building enclosure of foundation pit interior main body structure 10, bears the lateral pressure of the soil body and water；Base
Multiple monitoring points 12 are provided in hole；The setting of dewatering well 13 is used for base pit dewatering in foundation pit periphery bottom；It is sprayed on steel-pipe pile 9
100mm thickness concrete eight.
Excavation of foundation pit slope is to carry out slip casting to the active earth pressure area of slope surface using steel floral tube 2, works out and be laid with φ
The reinforced mesh of 6.5mm spacing 200mm*200mm, while driving into type earth anchor 4 and joint bar being attached with reinforced mesh, and right
Slope surface sprays 50mm thickness concrete, and slope section supporting is completed.Beat vertical steel-pipe pile 9 in slope foot position, steel-pipe pile 9 and crown beam,
Waist rail is connected to form a whole, and a binary foundation pit enclosure structure is collectively formed with prestress anchorage cable 7, and outside steel-pipe pile
It is 200x200mm reinforced mesh that φ 8mm spacing is welded in side, and facade sprays 100mm thickness concrete.
It from top to bottom successively include the supporting of slope section and piled anchor section supporting according to support system.
Slope section supporting: after slope is excavated, bolt-spary supports is carried out to slope surface.Specific steps: character and slope system according to soil
Number slope is worked out and in the reinforced mesh of slope surface arrangement φ 6mm spacing 200*200mm, injection 50mm thickness concrete 3.Slope section
Using classification slope, i.e. side slope is divided into two different gradients, and higher level's grade of side slope is 1:1, and junior's grade of side slope is 1:1.2,
Two-stage slope height is respectively 3m and 4m, and a platform, width 2m is arranged in level-one side slope and second level side slope intersection.
Piled anchor section supporting: steel-pipe pile 9 is and common with prestress anchorage cable 7 by being connected to form a whole with crown beam, waist rail
Form a binary foundation pit enclosure structure, on the one hand born by steel-pipe pile 9 soil pressure caused by Unloading and
Water pressure, and soil pressure and water pressure are passed into crown beam and waist rail；On the other hand pass through prestress anchorage cable 7 for crown beam and waist rail
Lateral pressure pass to stratum, and by applying prestressing force, the friction of Lai Zengjia prestress anchorage cable and the soil body to prestress anchorage cable
Power increases the bond stress of prestress anchorage cable 7 and the surrounding slip casting soil body, and then increases the intensity of supporting structure system entirety, rigidity,
Stability guarantees deep pit monitor.
The specific steps of piled anchor section supporting are as follows: it squeezes into steel-pipe pile and uses secondary cleavage fracture stress slip casting, anchor cable rig pore-forming,
Steel strand simultaneously carries out slip casting, and binding crown beam reinforcing bar and casting concrete install waist rail, carries out prestressing force to prestress wire
Tensioning, installation anchorage, then fabrication and installation φ 8mm spacing 200x200mm reinforced mesh and are welded with steel-pipe pile 9, are sprayed
100mm thickness concrete eight, finally completes pile-anchor supporting system.
400mm* is arranged in seamless steel pipe of the above-mentioned steel-pipe pile 9 using φ 152mm, wall thickness 5.5mm, spacing 0.4m, stake top
450mm crown beam, concrete grade C30.Grout injection in seamless steel pipe, intensity are not less than M20.The injection of pile foundation alien invasion
100mm thickness concrete guard wall, it is interior to hang the reinforced mesh that φ 8mm spacing is 200x200mm.
Above-mentioned secondary cleavage fracture stress grouting process refers to and buries part every one pulp of 1.5m left and right settings in steel-pipe pile
Hole is uniformly injected into slurries in stratum by secondary cleavage fracture stress slip casting, slurries to fill, permeate, it is compacted etc. in a manner of drive away
Wherein position is occupied after soil particle gap, moisture and air, by manual control for a period of time after, by original loose soil
Grain is cemented to that an intensity is big, good waterproof performance, chemically stable Seed harvest, and then enhances the integral strength of the soil body and the side of the soil body
To drag, guarantee that deep pit monitor is stablized.
Above-mentioned prestress anchorage cable 7 is separately positioned at crown beam and waist rail, and the spacing between each prestress anchorage cable 7 is set as 2m,
Including prestress wire 23, pedestal 17, Two bors d's oeuveres channel steel 18 and anchorage.7 one end of prestress anchorage cable is connect with crown beam, waist rail, separately
One end is anchored on the intracorporal prestress wire 23 of soil.120 anchor hole 22 of φ is beaten with anchor cable rig before crown beam pours and is worn pre-
Prestress steel strand 23, and casing is reserved in crown beam, prestress wire 23 throws away the long 1m of crown beam after wearing reserved casing, then
Two bors d's oeuveres channel steel 18 is installed on the outside of crown beam, tensioning is carried out to prestress wire 23 with tension tool and applies prestressing force, outside is used
Prestress anchorage cable 7 is fixed on stretching bed seat 21 by anchorage.Between Two bors d's oeuveres channel steel 18 and anchorage plus pressure-bearing steel plate 20 makees gasket.Waist
The prestress anchorage cable way of Liang Chu is identical as way at crown beam.
Crown beam is reinforced concrete structure, binds 18 reinforcing bar 14 of the first φ and respectively at upper and lower position at the top of the steel-pipe pile
Two φ, 18 reinforcing bar 16 is connected between the oneth φ 18mm reinforcing bar 14 and the first φ 18mm reinforcing bar 14 by 10 200 stirrup 15 of φ
It connects, is then poured with steel-pipe pile 9 and build up an entirety, crown beam top absolute altitude is concordant with foundation pit two stage steps.
In waist rail, steel-pipe pile prestressed anchor ' locked ' zone uses 20a Two bors d's oeuveres channel steel, with crown beam spacing 2m.
This foundation pit supporting system is mixed and disorderly suitable for soil property ingredient, the poor artificial accumulation soil layer of engineering properties, especially with sand
The soil properties type such as matter silt, silty clay is representative.
Present invention has the advantages that the depth in the stratum such as miscellaneous fill, silt and silty clay, medium coarse sand can be controlled effectively
Foundation pit vertical deformation and horizontal displacement are effectively reduced earth excavation project amount, project cost greatly reduce.
Detailed description of the invention
Fig. 1 is pattern foundation pit supporting structure sectional view.
Fig. 2 is crown beam arrangement of reinforcement.
Fig. 3 is steel-pipe pile crown beam anchor head full-page proof.
Fig. 4 is steel-pipe pile waist rail anchor head full-page proof.
In figure: 1, guardrail, 2, steel floral tube, 3,50mm thickness concrete, 4, driving into type earth anchor, 5, joint bar, 6, crown beam, 7, answer in advance
Power anchor cable, 8100mm thickness concrete, 9, mini pile, 10, foundation pit interior main body structure, 11, sewage pipe, 12, monitoring point, 13, precipitation
Well 14, the first φ 18mm reinforcing bar, 15,10 200 stirrup of φ, the 16, the 2nd φ 18mm reinforcing bar, 17, pedestal, 18, Two bors d's oeuveres channel steel, 20,
Pressure-bearing steel plate, 21, stretching bed seat, 22,120 anchor hole of φ, 23, prestress wire.
Specific embodiment
Below in conjunction with drawings and examples, the present invention is described in detail.
A kind of slope cooperates with support system with steel pipe piled anchor, which includes guardrail 1, steel floral tube 2,50mm thickness coagulation
Native 3, driving into type earth anchor 4, joint bar 5, crown beam 6, prestress anchorage cable 7,100mm thickness concrete eight, steel-pipe pile 9, foundation pit interior main body structure
10, sewage pipe 11, monitoring point 12 and dewatering well 13 in foundation pit.
The edge protection facility that guardrail 1 is arranged in as foundation pit exterior circumferential；The slope section of foundation pit is tied using multistage point slope
Structure, 2 pairs of multistages of steel floral tube divide the slope surface active earth pressure area of slope structure to carry out slip casting, to enhance the active soil that multistage divides slope structure
The soil strength and globality of pressure area；
The 50mm concrete topping 3 of the slope surface injection of classification, prevents classification slope surface may be by rain drop erosion；The 50mm of injection
It is equipped in thick concrete 3 and is welded with steel mesh and joint bar structure；
Driving into type earth anchor 4 is the connection structure for the slope surface reinforced mesh that multistage divides slope structure, to increase reinforced mesh and more
The slope surface of fraction slope structure and the overall adhesion of top of the slope.Joint bar 5 is consistent with the effect of driving into type earth anchor 4, is for improving
Reinforced mesh and the multistage slope surface adhesive force for dividing slope structure, reinforcing steel bar mesh sheet stability.
The effect of crown beam 6 is that the campshed for forming steel-pipe pile 9 is connected to become an entirety, while mentioning for prestressed anchor cable stretching
For a tensioning fixed base.
The lateral pressure that crown beam 6 and waist rail carry is passed to stratum by prestress anchorage cable 7, and prestress anchorage cable 7 is a power transmission
Component；
The campshed that steel-pipe pile 9 is formed is the building enclosure of foundation pit interior main body structure 10, bears the lateral pressure of the soil body and water；Base
Multiple monitoring points 12 are provided in hole；The setting of dewatering well 13 is used for base pit dewatering in foundation pit periphery bottom；It is sprayed on steel-pipe pile 9
100mm thickness concrete eight；
Excavation of foundation pit slope is to carry out slip casting to the active earth pressure area of slope surface using steel floral tube 2, works out and be laid with φ
The reinforced mesh of 6.5 spacing 200*200mm, while driving into type earth anchor 4 and joint bar being attached with reinforced mesh, and to slope surface
50mm thickness concrete is sprayed, slope section supporting is completed.Vertical steel tubular pole is beaten in slope foot position, steel-pipe pile is connect with crown beam, waist rail
An entirety is formed, and a binary foundation pit enclosure structure is collectively formed with prestress anchorage cable, and weld φ on the outside of steel-pipe pile
8mm spacing is 200x200mm reinforced mesh, and facade sprays 100mm thickness concrete.
It from top to bottom successively include the supporting of slope section and piled anchor section supporting according to support system.
Slope section supporting: after slope is excavated, bolt-spary supports is carried out to slope surface.Specific steps: character and slope system according to soil
Number slope is worked out and in the reinforced mesh of slope surface arrangement φ 6mm spacing 200*200mm, injection 50mm thickness concrete 3.Meanwhile it putting
Slope section is divided into two different gradients using classification slope, i.e. side slope, and higher level's grade of side slope is 1:1, and junior's grade of side slope is 1:
1.2, two-stage slope height is respectively 3m and 4m.And one platform is set in level-one side slope and second level side slope intersection, width is
2m。
Piled anchor section supporting: steel-pipe pile 9 is and common with prestress anchorage cable 7 by being connected to form a whole with crown beam, waist rail
Form a binary foundation pit enclosure structure, on the one hand born by steel-pipe pile 9 soil pressure caused by Unloading and
Water pressure, and soil pressure and water pressure are passed into crown beam and waist rail；On the other hand pass through prestress anchorage cable 7 for crown beam and waist rail
Lateral pressure pass to stratum, and by applying prestressing force, the friction of Lai Zengjia prestress anchorage cable and the soil body to prestress anchorage cable
Power increases the bond stress of prestress anchorage cable 7 and the surrounding slip casting soil body, and then increases the intensity of supporting structure system entirety, rigidity,
Stability guarantees deep pit monitor.
The specific steps of piled anchor section supporting are as follows: it squeezes into steel-pipe pile and uses secondary cleavage fracture stress slip casting, anchor cable rig pore-forming,
Steel strand simultaneously carries out slip casting, and binding crown beam reinforcing bar and casting concrete install waist rail, carries out prestressing force to prestress wire
Tensioning, installation anchorage, then fabrication and installation φ 8mm spacing 200x200mm reinforced mesh and are welded with steel-pipe pile 9, are sprayed
100mm thickness concrete eight, finally completes pile-anchor supporting system.
400mm* is arranged in seamless steel pipe of the above-mentioned steel-pipe pile 9 using φ 152mm, wall thickness 5.5mm, spacing 0.4m, stake top
450mm crown beam, concrete grade C30.Grout injection in seamless steel pipe, intensity are not less than M20.The injection of pile foundation alien invasion
100mm thickness concrete guard wall, it is interior to hang the reinforced mesh that φ 8mm spacing is 200x200mm.
Above-mentioned secondary cleavage fracture stress grouting process refers to and buries part every one pulp of 1.5m left and right settings in steel-pipe pile
Hole is uniformly injected into slurries in stratum by secondary cleavage fracture stress slip casting, slurries to fill, permeate, it is compacted etc. in a manner of drive away
Wherein position is occupied after soil particle gap, moisture and air, by manual control for a period of time after, by original loose soil
Grain is cemented to that an intensity is big, good waterproof performance, chemically stable Seed harvest, and then enhances the integral strength of the soil body and the side of the soil body
To drag, guarantee that deep pit monitor is stablized.
Above-mentioned prestress anchorage cable 7 is arranged in crown beam and waist rail position respectively, spacing 2m, including prestress wire 23, platform
Seat 17, Two bors d's oeuveres channel steel 18 and anchorage.7 one end of prestress anchorage cable is connect with crown beam, waist rail, and the other end is anchored at that soil is intracorporal pre- to answer
On power steel strand wires 23.120 anchor hole 22 of φ is beaten with anchor cable rig before crown beam pours and wears prestress wire 23, and in crown beam
Interior reserved casing, prestress wire 23 throw away the long 1m of crown beam after wearing reserved casing, and Two bors d's oeuveres channel steel is then installed on the outside of crown beam
18, tensioning is carried out to prestress wire 23 with tension tool and applies prestressing force, prestress anchorage cable 7 is fixed on by outside anchorage
On stretching bed seat 21.Between Two bors d's oeuveres channel steel 18 and anchorage plus pressure-bearing steel plate 20 makees gasket.Prestress anchorage cable way at waist rail with
Way is identical at crown beam.
Crown beam is reinforced concrete structure, binds 18 reinforcing bar 14 of the first φ and respectively at upper and lower position at the top of the steel-pipe pile
Two φ, 18 reinforcing bar 16 is connected between the oneth φ 18mm reinforcing bar 14 and the first φ 18mm reinforcing bar 14 by 10 200 stirrup 15 of φ
It connects, is then poured with steel-pipe pile 9 and build up an entirety, crown beam top absolute altitude is concordant with foundation pit two stage steps.
In waist rail, steel-pipe pile prestressed anchor ' locked ' zone uses 20a Two bors d's oeuveres channel steel, with crown beam spacing 2m.
This foundation pit supporting system is mixed and disorderly suitable for soil property ingredient, the poor artificial accumulation soil layer of engineering properties, especially with sand
The soil properties type such as matter silt, silty clay is representative.
[embodiment 1]
The new airport airport economic zone municipal traffic conveyance system most solemn of ceremonies road pipe gallery engineering (the 6th bid section) in Beijing, foundation pit
Southern side is the intercity high-speed rail of the corridor drop of water built, and north side is wasteland, meets natural discharging slope requirement, but is opened to reduce earth work
Project amount is dug, engineering overall cost is reduced, guarantees deep pit monitor, increases by row's steel pipe piled anchor in the position of two step steps of slope
Cooperate with supporting.Concrete operations:
1, slope is excavated, and is carried out slip casting to slope surface active earth pressure area using steel floral tube, is worked out and be laid with 6.5 spacing of φ
The reinforced mesh of 200*200mm, while driving into type earth anchor and joint bar are connect with reinforced mesh, with increase reinforced mesh and slope surface and
The overall adhesion of top of the slope, and to slope surface gunite concrete.
1, surveying setting-out fixed pile beats steel-pipe pile and carries out secondary cleavage fracture stress slip casting.
2, establishment crown beam reinforcing bar and casting concrete, crown beam section are 400mm*450mm, 1.2 meters of crown beam alien invasion interval
One reserved casing is set to wear prestress wire.
3, construction prestressed cable: surveying setting-out determines hole location → aperture and is drilled into anchorage cable design depth, production steel strand wires → clear
Hole and install the anchor cable → slurry that mixes cement → injection cement slurry conserve to design strength → installation anchor cable waist rail → anchorage cable stretching and
Anchoring.
4, steel strand wires throw away the long 1m of crown beam after wearing reserved casing.Then Two bors d's oeuveres channel steel is installed on the outside of crown beam, with tensioning work
Tool carries out tensioning to steel strand wires and applies prestressing force, and outside carries out an anchoring to steel strand wires with anchorage.
5,8 spacing 200x200mm reinforced mesh of φ is welded on the outside of steel-pipe pile, facade sprays 100mm thickness concrete.It completes.
Claims (7)
1. a kind of slope cooperates with support system with steel pipe piled anchor, it is characterised in that: the support system includes guardrail (1), steel floral tube
(2), 50mm thickness concrete (3), driving into type earth anchor (4), joint bar (5), crown beam (6), prestress anchorage cable (7), 100mm thickness concrete
(8), steel-pipe pile (9), foundation pit interior main body structure (10), sewage pipe (11), monitoring point (12) and dewatering well (13)；
The edge protection facility that guardrail (1) is arranged in as foundation pit exterior circumferential；The slope section of foundation pit divides slope structure using multistage,
Steel floral tube (2) divides the slope surface active earth pressure area of slope structure to carry out slip casting multistage；
The 50mm thickness concrete (3) of the slope surface injection of classification；In the 50mm thickness concrete (3) of injection be equipped be welded with steel mesh with
Joint bar structure；
Driving into type earth anchor (4) is the connection structure for the slope surface reinforced mesh that multistage divides slope structure, joint bar (5) and driving into type earth anchor
(4) effect is consistent, is for improving the slope surface adhesive force of reinforced mesh and multistage point slope structure；
The campshed that steel-pipe pile (9) is formed is connected to become an entirety by crown beam (6), while providing one for prestressed anchor cable stretching
Tensioning fixed base；
The lateral pressure that crown beam (6) and waist rail carry is passed to stratum by prestress anchorage cable (7), and prestress anchorage cable (7) is a biography
Power component；
Foundation pit interior main body structure (10) is arranged among the bottom of foundation pit, and sewage pipe (11) is embedded in foundation pit interior main body structure (10)
Two sides of the bottom；The campshed that steel-pipe pile (9) is formed is the building enclosure of foundation pit interior main body structure (10), bears the side pressure of the soil body and water
Power；Multiple monitoring points (12) are provided in foundation pit；Dewatering well (13) setting is used for base pit dewatering in foundation pit periphery bottom；Steel-pipe pile
(9) 100mm thickness concrete (8) are sprayed on.
2. a kind of slope according to claim 1 cooperates with support system with steel pipe piled anchor, it is characterised in that: slope section uses
It is classified slope, i.e. side slope is divided into two different gradients, and higher level's grade of side slope is 1:1, and junior's grade of side slope is 1:1.2, two-stage
Slope height is respectively 3m and 4m, and a platform, width 2m is arranged in level-one side slope and second level side slope intersection.
3. a kind of slope according to claim 1 cooperates with support system with steel pipe piled anchor, it is characterised in that: piled anchor section supporting
In, a binary is collectively formed by being connected to form a whole with crown beam, waist rail, and with prestress anchorage cable (7) in steel-pipe pile (9)
On the one hand foundation pit enclosure structure bears soil pressure and water pressure caused by Unloading by steel-pipe pile (9), and will
Soil pressure and water pressure pass to crown beam and waist rail；On the other hand pass through prestress anchorage cable (7) for crown beam and the lateral pressure of waist rail
Stratum is passed to, and by applying prestressing force to prestress anchorage cable, the frictional force of Lai Zengjia prestress anchorage cable and the soil body increases pre-
The bond stress of stress anchor cable (7) and the surrounding slip casting soil body, and then increase the intensity of supporting structure system entirety, rigidity, stability.
4. a kind of slope according to claim 3 cooperates with support system with steel pipe piled anchor, it is characterised in that: steel-pipe pile (9)
Using the seamless steel pipe of φ 152mm, wall thickness 5.5mm, spacing 0.4m, 400mm*450mm crown beam is arranged in stake top, and concrete grade is
C30；Grout injection in seamless steel pipe, intensity are not less than M20；Pile foundation alien invasion sprays 100mm thickness concrete guard wall, interior extension φ
8mm spacing is the reinforced mesh of 200x200mm.
5. a kind of slope according to claim 1 cooperates with support system with steel pipe piled anchor, it is characterised in that: prestress anchorage cable
(7) it is separately positioned at crown beam and waist rail, the spacing between each prestress anchorage cable (7) is set as 2m, including prestress wire
(23), pedestal (17), Two bors d's oeuveres channel steel (18) and anchorage；Prestress anchorage cable (7) one end is connect with crown beam, waist rail, other end anchoring
On the intracorporal prestress wire (23) of soil；120 anchor hole of φ (22) is beaten with anchor cable rig before crown beam pours and wears prestressing force
Steel strand wires (23), and casing is reserved in crown beam, prestress wire (23) throws away the long 1m of crown beam after wearing reserved casing, then
Two bors d's oeuveres channel steel (18) are installed on the outside of crown beam, tensioning is carried out to prestress wire (23) with tension tool and applies prestressing force, outside
Prestress anchorage cable (7) is fixed on stretching bed seat (21) by side with anchorage；Add pressure-bearing steel plate between Two bors d's oeuveres channel steel (18) and anchorage
(20) gasket is made；Prestress anchorage cable way at waist rail is identical as way at crown beam.
6. a kind of slope according to claim 1 cooperates with support system with steel pipe piled anchor, it is characterised in that: crown beam is reinforcing bar
Concrete structure binds 18 reinforcing bar of the first φ (14) and 18 reinforcing bar of the 2nd φ (16) at upper and lower position at the top of the steel-pipe pile respectively,
Be attached between first φ 18mm reinforcing bar (14) and the first φ 18mm reinforcing bar (14) by 10 200 stirrup of φ (15), then with
Steel-pipe pile (9), which pours, builds up an entirety, and crown beam top absolute altitude is concordant with foundation pit two stage steps.
7. a kind of slope according to claim 1 cooperates with support system with steel pipe piled anchor, it is characterised in that: in waist rail, steel
Tubular pile pre-stress rock bolt region uses Two bors d's oeuveres channel steel (18), with crown beam spacing 2m.
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| CN111501777A (en) * | 2020-04-20 | 2020-08-07 | 中铁隧道集团二处有限公司 | Construction method for treating bias voltage of open cut foundation pit |
| CN114319389A (en) * | 2021-12-21 | 2022-04-12 | 中铁建设集团(杭州)建设有限公司 | Construction method for urban comprehensive pipe gallery foundation pit support |
| CN114991168A (en) * | 2022-06-21 | 2022-09-02 | 中国五冶集团有限公司 | Supporting pile reinforcing structure positioned outside foundation pit and construction method thereof |
| CN115305924A (en) * | 2022-08-30 | 2022-11-08 | 甘肃中建市政工程勘察设计研究院有限公司 | Prestress construction method for reducing deformation of deep foundation pit |
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| CN110374111B (en) | 2024-03-22 |
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