CN108914947A - Foundation pit anchor wall draws the construction method of anchor supporting and its supporting construction of drilling tool and formation - Google Patents
Foundation pit anchor wall draws the construction method of anchor supporting and its supporting construction of drilling tool and formation Download PDFInfo
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- CN108914947A CN108914947A CN201811091392.1A CN201811091392A CN108914947A CN 108914947 A CN108914947 A CN 108914947A CN 201811091392 A CN201811091392 A CN 201811091392A CN 108914947 A CN108914947 A CN 108914947A
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- 238000010276 construction Methods 0.000 title claims abstract description 48
- 238000005553 drilling Methods 0.000 title claims abstract description 48
- 230000015572 biosynthetic process Effects 0.000 title abstract description 6
- 239000004567 concrete Substances 0.000 claims abstract description 36
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 238000005507 spraying Methods 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims abstract description 8
- 238000007711 solidification Methods 0.000 claims abstract description 7
- 230000008023 solidification Effects 0.000 claims abstract description 7
- 238000004873 anchoring Methods 0.000 claims abstract description 6
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 5
- 239000002689 soil Substances 0.000 claims description 49
- 239000004568 cement Substances 0.000 claims description 16
- 230000009545 invasion Effects 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000002775 capsule Substances 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007586 pull-out test Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- 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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0038—Production methods using an auger, i.e. continuous flight type
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- 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)
- Piles And Underground Anchors (AREA)
Abstract
The construction method of anchor supporting and its supporting construction of drilling tool and formation are drawn the invention discloses a kind of foundation pit anchor wall, are included the following steps：1) braced wall is made；2) anchor wall is made：It is required according to detail design, determines the position of each grouser on the ground, then make multiple armored concrete anchoring stakes；After grouser solidification, according to the distance between two neighboring grouser, drilled on the ground between two neighboring grouser with whirl spraying twist bit；After being bored into projected depth, auger stem is promoted on one side, and determining water-spray type slurry on one side, guncreting is to designed elevation simultaneously, and then descending reinforcing cage, forms a reinforced concrete pile being connected with two sides grouser；Reinforced concrete pile is successively made between all adjacent grousers by above-mentioned steps, then makes armored concrete cap beam at the top of grouser, buried depth is below ground at least 1m, forms armored concrete and is anchored wall；3) anchor tie of production connection braced wall and anchor wall.
Description
Technical field
The present invention relates to pattern foundation pit supporting structures, more particularly to a kind of foundation pit supporting construction, construction method and drilling tool.
Background technique
Pattern foundation pit supporting structure is the safety to guarantee Underground Construction and foundation pit surrounding environment, to foundation pit side-wall and peripheral ring
Supporting and retaining system, reinforcing and the safeguard measure that border uses.Pattern foundation pit supporting structure form mainly has：(1) campshed supporting, stake support, piled anchor, campshed are outstanding
Arm；(2) diaphram wall supporting, ground-connecting-wall+support；(3) cement retaining wall；(4) soil nail wall (combined bolting and shotcrete)；(5) inverse to make to encircle
Wall；(6) undisturbed soil slope；(7) stake, wall add support system；(8) simple horizontal supports；(9) armored concrete campshed；(10) on
State the reasonable combination etc. of two or more mode.
The pattern foundation pit supporting structure of current architectural engineering frequently with stake, anchor supporting construction, but soft soil foundation anchor pole frictional force very
It is low, it much can not meet design requirement, currently existing technique is solved without more preferable method, can only be replaced using inner supporting structure
The construction of anchor pole, especially large-span deep foundation pit inner support, supports extremely difficult；And it is non-to be layered interior native and main structure construction of digging pit
Often difficult, the duration greatly prolongs, time-consuming, economically, in progress loses more than gain.
Summary of the invention
The construction method of anchor supporting and its branch of drilling tool and formation are drawn the object of the present invention is to provide a kind of foundation pit anchor wall
Protection structure.
To achieve the above object, technical scheme is as follows：
A kind of foundation pit anchor wall draws the construction method of anchor supporting, includes the following steps：
(1) braced wall is made：
It is required according to detail design, determines each braced wall stake position on the ground, then production forms multiple braced walls
Stake；
After braced wall stake solidification, according to the spacing between two neighboring braced wall stake, in two neighboring braced wall stake
Between ground on drill, the side wall of the hole wall to be drilled and two adjacent braced wall stakes is at a distance of 10~15cm；
After being bored into projected depth, drilling rod is promoted on one side, carries out determining water-spray type slurry on one side or guncreting arrives simultaneously
Design height forms a cement earth pile or concrete-pile being connected with the braced wall stake of two sides；
Cement earth pile or concrete-pile are successively made between all adjacent braced wall stakes by above-mentioned steps, form foundation pit
The row of piles formula waterproof braced wall that supporting, the anti-mud of waterproof are squeezed into.
(2) anchor wall is made：
It is required according to detail design, determines the position of the first sequence grouser on the ground, then make multiple reinforced concretes
Native grouser；
After the solidification of the first sequence grouser, according to the distance between two neighboring first sequence grouser, with whirl spraying auger
Machine drills on the ground between two neighboring first sequence grouser, and the hole wall of hole is anchored with two the first sequences respectively
The side wall of stake is within 10-15cm；
After being bored into projected depth, promote auger stem on one side, determine on one side water-spray type slurry simultaneously guncreting to setting
Absolute altitude is counted, then the descending reinforcing cage in stake holes inner concrete, forms one and pass through concrete slab and two sides the first sequence grouser phase
The second sequence armored concrete even is anchored stake；
The anchoring stake of the second sequence armored concrete is successively made between all the first adjacent sequence grousers by above-mentioned steps,
Then armored concrete cap beam is made at the top of all grousers, buried depth is below ground at least 1m, forms armored concrete
Anchor wall；
(3) anchor tie of at least one layer of connection braced wall and anchor wall of production：
Drilling and forming hole operation is carried out according to the bolthole design position and design angle in braced wall using roof-bolter, is bored
Enter anchor wall surface；
Concrete slab and concrete-pile, adjustment rate of penetration and whirl spraying pressure, drilling whirl spraying to design are drilled through with roof-bolter
Then depth promotes whirl spraying to anchor wall inner surface again, then is bored into projected depth；
It is inserted into steel anchor tie or the anchor tie containing slurry capsule in drilling rod to bottom hole, extracts drilling rod, is carried out by plastic tube
Cement slurry is filled into, drawing locking is carried out after cement slurry reaches design strength, forms the connecting rod of anchor wall and braced wall.
Wherein, the intersection point along bottom of foundation ditch horizontal line and braced wall alien invasion vertical line does active earth pressure line, the active
The soil pressure line of force and the angle of braced wall alien invasion vertical line areIt is describedIt is flat for the internal friction angle of active earth pressure area soil
Mean value, the horizontal intersection point at the top of active earth pressure line and anchor tie do passive earth pressure line, the passive earth pressure line
Angle with active earth pressure line is 90 °, is active region, the passive earth pressure between the active earth pressure line and braced wall
It is differential gap between line and active earth pressure line, is passive area, the armored concrete cap beam on the outside of the passive earth pressure line
Positioned at passive area, the wall of the anchor wall below the armored concrete cap beam is located at differential gap.
Wherein, in step (2), the spacing of two neighboring grouser is 10-15cm.
Wherein, anchor tie is made as one or more layers in step (3).
Wherein, anchor wall is continous way or segmented in step (2).
Wherein, anchor wall is the structure composite wall for fixing pattern foundation pit supporting structure wall stress pull rod, including concrete in step (2)
Stake anchor wall, reinforced concrete pile anchor wall, mortar pile anchor wall, rotary churning pile anchor wall and mixing pile anchor wall.
Anchor supporting construction is drawn using the anchor wall of above-mentioned construction method production, including braced wall, anchor wall and is drawn the two
The anchor tie locked together is pulled out, the braced wall is by multiple braced wall stakes and the cement between two neighboring braced wall stake
Native stake or concrete-pile are formed by connecting, and the anchor wall is formed by connecting by multiple grousers, and the anchor tie is in horizontal direction
0 °~45 ° angles.
Wherein, the anchor tie is one or more layers.
Foundation pit anchor wall draws drilling tool used by the construction method of anchor supporting, wherein the drilling rod of drilling tool is cored screw type
Drilling rod, the diameter dimension of drilling rod central tube are design stake diameter 50%~80%；The unidirectional length of drilling rod helical blade radial direction is
5cm~15cm, with a thickness of 0.5cm~5cm.
Supporting metope in supporting construction of the invention, pull rod, anchor wall and soil, water between retaining wall and anchor wall are total
With one composite construction of composition, the internal force needs of this composite construction interaction mutually balance each other, therefore are anchored wall construction design
Mainly how Correct Analysis solves the problems, such as two aspects of internal force balance and monolithic stability.At the same time, in this complex
Periphery on there is also the external soil, water pressure, frictional force and the dynamic load gravity that transmit from ground.These external force
It must balance, guarantee monolithic stability, prevent sliding or creeping deformation.According to《Building foundation pit supporting technical regulation》Design base
Hole retaining wall and anchor rod drawing power, the anti-pulling of anchor bar of soft soil foundation can not meet design requirement.Anchor pole is only fixed on anchor
Determine on wall, after anchor wall tension, when pulling force increase to a certain extent when, the soil body generates certain compressive deformation in front of anchor wall,
The soil body is compacted, generates very big passive earth pressure, and the withdrawal resistance of anchor wall need to be calculated with theory of passive pressure of soil, meets pull rod drawing
The design of pull out force.
(1) burial place of anchor wall：
Anchor wall must necessarily be placed in stable differential gap, the enough distances being at least placed on other than the active earth pressure plane of fracture.
Horizontal line is generally done with the position of first layer anchor pole, the passively soil pressure line of force is found out, the position of anchor wall is used as outside line.Mainly by
Power area should not invade the left side of the active earth pressure plane of fracture.
The ratio between total passive earth pressure and the total pulling capacity of anchor pole safety coefficient are safe not less than 1.5 on anchor wall.
(2) estimation of anchor wall withdrawal resistance：
In formula：Coefficient of passive earth pressure；
Coefficient of active earth pressure；
H：Anchor plate top is to anchor wall bottom height (m)；
Υ：The volume-weighted average (KPa) of each soil layer within the scope of ground to anchor wall bottom.
Passive earth pressure：When the soil body is under external force towards when wall direction movement or rotation, wall back soil is squeezed,
There is upper sliding trend, to prevent the shearing force on sliding sliding surface from being equal to soil classifiction, it is flat that the wall back soil body reaches the passive limit
Weighing apparatus state, soil body upward sliding, the soil pressure at this moment acted on metope reach maximum value --- it is known as passive earth pressure Ep.
Passive earth pressure resultant force
The passive earth pressure on anchor wall surface is that one times of active earth pressure arrives several times.Surface by whirl spraying is connected in soil
There is very big frictional resistance together, while anchor wall lower part is embedded in the top that preferable soil layer upper bolt largely locks anchor wall, anchor
Determining wall has very big bending resistance pulling capacity, and the withdrawal resistance of anchor wall is the combination of a composite force in fact, can be true by pull-out test
Determine ultimate pullout capacity.
(3) foundation pit supporting construction of the invention uses " permanent rigid waterproofing wall " supporting foundation pit, organic instead of underground structure
Waterproof layer and foundation pit gib wall；Basic exterior sheathing can be done again, this wall connects together with foundation structure, biggish to improve base
The bearing capacity of plinth, anti-floating power have certain effect of contraction to the rebound of basal plane soil, protuberance and sedimentation.Drop is not had in the construction process
Water, not blowdown, without fertilizer slot backfill, speed of application is fast, high-quality, low cost, is a kind of more satisfactory construction technology.
Compared with the existing technology, protrusion effect of the invention is：
(1) present invention can be used in argillic horizon, sandy soils or gravel layer；It is especially suitable for soft soil layer, is drawn using anchor wall
Anchor support retaining wall is solved the problems, such as in deep foundation pit of soft soil foundation large span retaining wall supporting.
(2) after anchor wall stress, the soil body before wall generates very big passive earth pressure after drawing compressive deformation,
Withdrawal resistance, resistance to bending are generated on anchor wall, and the forced area before anchor wall is very big, it is very firm above rock bolt, 1
Root anchor pole can tens tons or up to a hundred tons pulling force of drawing, while all anchor poles all lock on anchor wall, uniform stressed, and anchor wall is motionless
Then all anchor poles are all motionless, and retaining wall is firm, indeformable or Light deformation, high-quality, withdrawal resistance is big.
(3) present invention uses the drill rod special of soft soil foundation construction in equipment, screw rod core pipe overstriking, with spiral
The area of blade becomes smaller, thus increases to weak soil crowd in-out effects, solves in soft soil foundation construction collapse hole and necking down problem, bores
It is unearthed few in hole.
(4) speed of application of the technology of the present invention is fast, labor and material saving, low cost, is a kind of easy applicable construction technology.
Illustrate the construction party that anchor supporting is drawn with specific embodiment foundation pit anchor wall of the present invention with reference to the accompanying drawing
Method and its drilling tool and the supporting construction of formation are described further.
Detailed description of the invention
Fig. 1 is the stereoscopic schematic diagram that foundation pit anchor wall draws anchor supporting construction；
Fig. 2 is the diagrammatic cross-section that foundation pit anchor wall draws anchor supporting construction；
Fig. 3 is that foundation pit anchor wall draws drill structure diagram used by anchor supporting；
Fig. 4 is the diagrammatic cross-section that foundation pit anchor wall draws anchor supporting in embodiment 2；
Fig. 5 is another diagrammatic cross-section that foundation pit anchor wall draws anchor supporting in embodiment 2.
Wherein, 10- anchor wall, 20- anchor tie, 30- braced wall, 40- concrete slab, 50- foundation pit, 1- drilling machine hollow centre
Pipe, 2- blade.
Specific embodiment
Embodiment 1
In conjunction with shown in Fig. 1-2, foundation pit anchor wall draws the construction method of anchor supporting, includes the following steps：
(1) braced wall 30 is made：
It is required according to detail design, determines each braced wall stake position on the ground, then production shapes multiple braced walls
Stake；
After braced wall stake solidification, according to the spacing between two neighboring braced wall stake, in two neighboring braced wall stake
Between ground on drill, the side wall of the hole wall to be drilled and two adjacent braced wall stakes is tangent or according to detail design
It needs to be also designed to：The side wall of the hole wall and two adjacent braced wall stakes that are drilled is within 10-15cm.
After being bored into projected depth, promote drilling rod on one side, carry out determining on one side water-spray type slurry simultaneously guncreting to setting
Meter height, forms a cement earth pile or concrete-pile being connected with the braced wall stake of two sides；Specific process parameter is：Surely it sprays
Power：5-20Mpa；Upward strain speed：0.5~2.0m/min；Cement slurry grouting material：The ratio of mud is 1:1, mending pulp-water gray scale is 0.5,
Fresh moisture free ordinary portland cement PO42.5；Stake position tolerance is：5.0mm；Verticality tolerance is：0.5%.
Cement earth pile or reinforced concrete pile are successively made between all adjacent braced wall stakes by above-mentioned steps, are formed
The row of piles formula waterproof braced wall 30 that the anti-mud of pattern foundation pit supporting structure, waterproof is squeezed into.
(2) anchor wall 10 is made：
It is required according to detail design, determines the position of each grouser on the ground, then make multiple armored concrete
Grouser；The spacing of two neighboring grouser is 10-15cm.
After grouser solidification, according to the distance between two neighboring grouser, with whirl spraying twist bit two neighboring
Drill on ground between grouser, the hole wall of hole respectively the side wall with two grousers at a distance of 10-15cm；
After being bored into projected depth, promote auger stem on one side, determine on one side water-spray type slurry simultaneously guncreting to setting
Absolute altitude is counted, then the descending reinforcing cage in stake holes inner concrete, forms a reinforced concrete pile being connected with two sides grouser；Tool
Body technology parameter is：Surely power is sprayed：5-20Mpa；Upward strain speed：0.5~2.0m/min；Grouting material：The ratio of mud is 1:1, it mends
Pulp-water gray scale is 0.5, fresh moisture free ordinary portland cement PO42.5；Stake position tolerance is：5.0mm；Verticality permits
Perhaps deviation is：0.5%.
Reinforced concrete pile is successively made between all adjacent grousers by above-mentioned steps, then on the top of grouser
Portion makes armored concrete cap beam, and buried depth is below ground at least 1m, forms armored concrete and is anchored wall 10；Reinforced concrete anchors
Determining wall 10 is continous way, or segmented；
(3) anchor tie 20 of at least one layer of connection braced wall and anchor wall of production：
Wherein, the intersection point along bottom of foundation ditch horizontal line and braced wall alien invasion vertical line does active earth pressure line, active soil pressure
The line of force and the angle of braced wall alien invasion vertical line are For the average value of the internal friction angle of active earth pressure area soil, edge
Horizontal intersection point at the top of active earth pressure line and anchor tie does passive earth pressure line, passive earth pressure line and active earth pressure
The angle of line is 90 °, is active region between active earth pressure line and braced wall, between passive earth pressure line and active earth pressure line
For differential gap, passive earth pressure line outside is passive area, and armored concrete cap beam is located at passive area, anchor wall armored concrete cap
The wall of anchor wall below beam is located at differential gap.
Drilling and forming hole operation is carried out according to the bolthole design position and design angle in braced wall using roof-bolter, is bored
Enter 10 surface of anchor wall；
Concrete-pile and concrete slab 40, adjustment rate of penetration and whirl spraying pressure drilling whirl spraying to design are drilled through with roof-bolter
Depth；Whirl spraying is then lifted out to anchor wall inner surface, then creeps into projected depth；
It is inserted into steel anchor tie or the anchor tie containing slurry capsule in drilling rod, extracts drilling rod, carries out filling into water by plastic tube
Mud carries out drawing locking after cement slurry reaches design strength, forms the connecting rod of anchor wall and braced wall.
Wherein, anchor wall can be concrete-pile anchor wall, reinforced concrete pile anchor wall, mortar piled anchor in step (2)
Determine wall, rotary churning pile anchor wall, mixing pile anchor wall.
Wherein, the making step of braced wall stake or grouser is as follows：
(1) drilling machine is in place；(2) it creeps into；(3) drilling to completion stops drilling；(4) by concrete conveyance hose one
It is connected at the top of end and drilling rod, the other end and concrete pump are connected；(5) by superfluidity pea gravel concreten by delivery pump with certain
Pressure is filled through delivery hose and long screw drill rod inner cavity to hole base pressure；(6) measure control drilling rod hoisting depth is pressed, side pressure fills coagulation
Native side promotes drilling rod, until concrete reaches designed elevation；(7) steel reinforcement cage is pressed into stake holes inner concrete and is affixed to design position
It sets；(8) pile.
Anchor supporting construction is drawn using the anchor wall of above-mentioned construction method production, including braced wall 30, anchor wall 10 and by two
The anchor tie 20 that person's drawing locks together, the braced wall 30 by multiple braced wall stakes and be located at two neighboring braced wall stake it
Between cement earth pile or concrete-pile be formed by connecting, the anchor wall 10 is formed by connecting by multiple grousers, the anchor tie 20
It is in 0 °~45 ° angles with horizontal direction.Wherein, the anchor tie 20 is one or more layers.
As shown in connection with fig. 3, foundation pit anchor wall draws drilling tool used by the construction method of anchor supporting, wherein the drilling rod of drilling tool
For cored screw type drilling rod, the diameter dimension of drilling rod hollow centre pipe 1 is design stake diameter 50%~80%；Drilling rod helical blade
2 radial unidirectional length are 5cm~15cm, with a thickness of 0.5cm~5cm.
Embodiment 2
For the Foundation Support of certain one skyscraper of city, using the construction method and drilling tool of embodiment 1, wherein
Specific calculating process before construction is as follows：
The pulling capacity that anchor pole is calculated according to Fig. 4, then rock bolt on anchor wall, then is designed anchor wall drawing
Power.
(1) anchor rod drawing power (soil pressure, anchor rod drawing power are calculated according to Fig. 5)
1. barricade stake soil pressure distribution：
In mud -12m parameter：
Υ：The volume-weighted average (KPa) of each soil layer within the scope of ground to anchor wall bottom.
γw：Water severe (force density).
The cohesive strength of soil：C=15KPa；
There are underground water, Υ in the place -6mw=10, it is layered soil pressure l0、l1、l2、l3、l4, water pressure l '0、l′3、l′4。
q：Ground (additional load)
Υ qK α=l0
l′0=K α Υ × 1.5m=16.8
l2=K α Υ (4+4)/2=44.8
l3=K α Υ ' (4+4)/2=16.8
l′3=Υ w (4+4)/2=40
l44/2=0.7 × 6=K α Υ ' × 2=8.4
l′4=Υ w × 2=20
l″1=l0+l1=16.8+26.9=43.7
l″2=l2+l″1=44.8+43.7=88.5
l″3=l "2+l3+l′3=88.5+16.8+40=145.3
l″4=l "3+l4+l′3=145.3+8.4+20=173.7
2. the axial pulling capacity design value of every layer of anchor pole
Anchor pole interplanar spacing B=1.2m, safety coefficient K=1.5.
Anchor pole inclination alpha=15 °, cos15 °.
3. anchor rod drawing power limiting value：
R′1=72.6/cos15 ° × 1.2 × 1.5=75.16 × 1.2 × 1.5=135.3
R′2=264.4/cos15 ° × 1.2 × 1.5=273.7 × 1.2 × 1.5=492.7
R′3=467.6/cos15 ° × 1.2 × 1.5=484.1 × 1.2 × 1.5=871.4
2 anchor wall ultimate bearing force evaluatings (rock bolt is on anchor wall)
Anchor wall is by transmitting the stress-displacement relation of the soil body in front of the pulling force anchor wall increased step by step from pull rod from static
Pressure state is gradually evolved into state of limit equilibrium, claims anchor wall in limiting condition, and the maximum withdrawal resistance that can bear is its pole
Limit withdrawal resistance.
(1) anchor wall design position.
The area of anchor wall and position, it is necessary to while meeting two basic demands, first item requirement is that anchor wall must have
To balance the internal force that anchor pole is transmitted from metope, Section 2 requires to be that anchoring wall construction as a whole must be enough breakout capacities
Braced wall is kept to stablize under the action of external force (ground soil pressure, frictional force and load weight etc.).
As long as differential gap anchor wall of the anchor wall design other than active earth pressure withstands on neutral soil pressure area, anchor is made downwards
Determine wall, anchor wall leaves active soil pressure broken face certain distance, can guarantee that the effect of ground withdrawal resistance is not become by active earth pressure in this way
The influence of change, but after practical anchor pole tenses anchor wall, soil layer is compacted among anchor wall and retaining wall, generates before anchor wall
Passive earth pressure, anchor wall generate bending resistance flexible deformation, there is withdrawal resistance upwards, to form a kind of novel tension rod structure.
Its one end other end that is connected with retaining wall is anchored at the soil body compacted between two walls on anchor wall and connects together, and is formed
One internal force balance, several meters to more than ten meters thick supporting and retaining system systems.
(2) limit pulling capacity of anchor wall.
1. the ultimate pullout capacity T of every linear meter(lin.m.) anchor wall：
In formula：Coefficient of passive earth pressure；
Coefficient of active earth pressure；
H~ground is to anchor wall bottom height (m)；
The volume-weighted average (KPa) of each soil layer within the scope of Υ~ground to anchor wall bottom.
2. taking parameter according to geologic report and design requirement
H=16m, B=1.2m, mud：γ=16KPa
C=15, each part dimensional drawing 4 calculate anchor pole horizontal space：B=1.2m
3,3 layers of rock bolt are on anchor wall
3 layers of anchor pole are in 1.2m wide scope, limit pulling capacity：
R α=R '1+R′2+R′3=135.3+492.7+871.4=1499.4KN
T=1769.5KN
T=1769.5KN > R α=1499.4KN (meets design)
The withdrawal resistance of practical anchor wall, greater than the passive earth pressure of calculating, such as：Friction counterforce, two-sided is arranged at anchor wall bottom
Frictional resistance, resistance to bending etc., entire joist anchor is solid be in the earth formation it is very firm, after anchor wall is tightened up, active soil pressure broken face is only
Occur at the rear of anchor wall, is not in active soil pressure broken face between metope and anchor wall.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (10)
1. the construction method that a kind of foundation pit anchor wall draws anchor supporting, which is characterized in that include the following steps：
(1) braced wall is made；
(2) anchor wall is made：
It is required according to detail design, determines the position of the first sequence grouser on the ground, then make multiple reinforced concrete anchors
Determine stake；
After the solidification of the first sequence grouser, according to the distance between two neighboring first sequence grouser, existed with whirl spraying twist bit
Drill on ground between two neighboring first sequence grouser, the hole wall of hole respectively with two the first sequence grousers
Side wall is within 10-15cm；
After being bored into projected depth, auger stem is promoted on one side, and determining water-spray type slurry on one side, guncreting is marked to design simultaneously
Height, then the descending reinforcing cage in stake holes inner concrete, forms one and passes through what concrete slab was connected with two sides the first sequence grouser
Second sequence armored concrete is anchored stake；
The anchoring stake of the second sequence armored concrete is successively made between all the first adjacent sequence grousers by above-mentioned steps, then
Armored concrete cap beam is made at the top of all grousers, buried depth is below ground at least 1m, forms armored concrete anchoring
Wall；
(3) anchor tie of at least one layer of connection braced wall and anchor wall of production；
Wherein, the intersection point along bottom of foundation ditch horizontal line and braced wall alien invasion vertical line does active earth pressure line, the active soil pressure
The line of force and the angle of braced wall alien invasion vertical line areIt is describedFor the internal friction angle average value of active earth pressure area soil,
Horizontal intersection point at the top of active earth pressure line and anchor tie does passive earth pressure line, the passive earth pressure line and active
The angle of the soil pressure line of force is 90 °, is active region, the passive earth pressure line and master between the active earth pressure line and braced wall
It is differential gap between dynamic soil pressure line, is passive area on the outside of the passive earth pressure line, the armored concrete cap beam is located at quilt
Area is moved, the wall of the anchor wall below the armored concrete cap beam is located at differential gap.
2. the construction method that foundation pit anchor wall according to claim 1 draws anchor supporting, which is characterized in that the step (3)
Specially：
Drilling and forming hole operation is carried out according to the bolthole design position and design angle in braced wall using roof-bolter, drilling arrives
Anchor wall surface；
Concrete slab and concrete-pile are drilled through with roof-bolter, adjustment rate of penetration and whirl spraying pressure, drilling whirl spraying to projected depth,
Then whirl spraying is promoted again to anchor wall inner surface, then is bored into projected depth；
It is inserted into steel anchor tie or the anchor tie containing slurry capsule in drilling rod to bottom hole, extracts drilling rod, is filled by plastic tube
Cement slurry carries out drawing locking after cement slurry reaches design strength, forms the connecting rod of anchor wall and braced wall.
3. the construction method that foundation pit anchor wall according to claim 2 draws anchor supporting, it is characterised in that：The step (1)
Specially：
It is required according to detail design, determines each braced wall stake position on the ground, then production forms multiple braced wall stakes；
After braced wall stake solidification, according to the spacing between two neighboring braced wall stake, between two neighboring braced wall stake
Ground on drill, the side wall of the hole wall to be drilled and two adjacent braced wall stakes is at a distance of 10~15cm；
After being bored into projected depth, promote drilling rod on one side, carry out determining on one side water-spray type slurry or simultaneously guncreting to design
Highly, a cement earth pile or concrete-pile being connected with the braced wall stake of two sides is formed；
Cement earth pile or concrete-pile are successively made between all adjacent braced wall stakes by above-mentioned steps, form foundation pit branch
The row of piles formula waterproof braced wall that shield, the anti-mud of waterproof are squeezed into.
4. the construction method that foundation pit anchor wall according to claim 3 draws anchor supporting, it is characterised in that：The step (2)
In, the spacing of two neighboring grouser is 10-15cm.
5. the construction method that foundation pit anchor wall according to claim 4 draws anchor supporting, it is characterised in that：The step (3)
Middle anchor tie is made as one or more layers.
6. the construction method that foundation pit anchor wall according to claim 5 draws anchor supporting, it is characterised in that：The step (2)
Middle anchor wall is continous way or segmented.
7. the construction method that foundation pit anchor wall according to claim 6 draws anchor supporting, it is characterised in that：The step (2)
Middle anchor wall is the structure composite wall of fixed pattern foundation pit supporting structure wall stress pull rod, including concrete-pile anchor wall, armored concrete
Stake anchor wall, mortar pile anchor wall, rotary churning pile anchor wall and mixing pile anchor wall.
8. drawing the anchor wall of the construction method production of anchor supporting to draw anchor branch using foundation pit anchor wall as claimed in claim 1 to 7
Protection structure, it is characterised in that：Including braced wall, anchor wall and the anchor tie for locking together the two drawing, the braced wall
Cement earth pile or concrete-pile by multiple braced wall stakes and between two neighboring braced wall stake are formed by connecting, the anchoring
Wall is formed by connecting by multiple grousers, and the anchor tie and horizontal direction are in 0 °~45 ° angles.
9. anchor wall according to claim 8 draws anchor supporting construction, it is characterised in that：The anchor tie is one layer or more
Layer.
10. foundation pit anchor wall as claimed in claim 1 to 7 draws drilling tool used by the construction method of anchor supporting, feature exists
In：The drilling rod of drilling tool is cored screw type drilling rod, and the diameter dimension of drilling rod central tube is design stake diameter 50%~80%；Drilling rod
The unidirectional length of helical blade radial direction is 5cm~15cm, with a thickness of 0.5cm~5cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811091392.1A CN108914947A (en) | 2018-09-19 | 2018-09-19 | Foundation pit anchor wall draws the construction method of anchor supporting and its supporting construction of drilling tool and formation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811091392.1A CN108914947A (en) | 2018-09-19 | 2018-09-19 | Foundation pit anchor wall draws the construction method of anchor supporting and its supporting construction of drilling tool and formation |
Publications (1)
| Publication Number | Publication Date |
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| CN108914947A true CN108914947A (en) | 2018-11-30 |
Family
ID=64408212
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811091392.1A Pending CN108914947A (en) | 2018-09-19 | 2018-09-19 | Foundation pit anchor wall draws the construction method of anchor supporting and its supporting construction of drilling tool and formation |
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| CN (1) | CN108914947A (en) |
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| CN113235615A (en) * | 2021-05-27 | 2021-08-10 | 中交投资咨询(北京)有限公司 | Deep foundation pit reinforcing device and construction method thereof |
| CN116905525A (en) * | 2023-09-12 | 2023-10-20 | 天津建城基业管桩有限公司 | Prestressed hollow pile foundation pit supporting structure |
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