CN104831737B - Construction method of basement support for subway station - Google Patents

Construction method of basement support for subway station Download PDF

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Publication number
CN104831737B
CN104831737B CN201510234313.8A CN201510234313A CN104831737B CN 104831737 B CN104831737 B CN 104831737B CN 201510234313 A CN201510234313 A CN 201510234313A CN 104831737 B CN104831737 B CN 104831737B
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CN
China
Prior art keywords
basement
slope
well
strength compound
electric osmose
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201510234313.8A
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Chinese (zh)
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CN104831737A (en
Inventor
孔志坚
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Heze Jiayi can making Co.,Ltd.
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孔志坚
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 孔志坚 filed Critical 孔志坚
Priority to CN201610288380.2A priority Critical patent/CN105926670B/en
Priority to CN201610288400.6A priority patent/CN105926671B/en
Priority to CN201610288398.2A priority patent/CN105971008B/en
Priority to CN201510234313.8A priority patent/CN104831737B/en
Priority to CN201610288427.5A priority patent/CN105986580B/en
Publication of CN104831737A publication Critical patent/CN104831737A/en
Application granted granted Critical
Publication of CN104831737B publication Critical patent/CN104831737B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/04Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/12Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/20Restraining of underground water by damming or interrupting the passage of underground water by displacing the water, e.g. by compressed air
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74Means for anchoring structural elements or bulkheads

Abstract

The invention discloses a construction method of a basement support for a subway station. The construction method of the basement support for the subway station is characterized in that electro-osmotic wells are arranged on the outer edge of the basement support, wherein the electro-osmotic wells are uniformly arranged along the outer edge of the basement support; a plastic thin film covers the upper surface of topsoil between every slope protection pile and the corresponding electro-osmotic well; a two-time slope grading way is adopted for the basement support; the first-time slope grading is from a ground surface to places which are at 2/3 of the depth of a basement; first-time slope grading places are provided with high-strength composite battens; the high-strength composite battens are short at upper parts and long at lower parts; the second slope grading is from the places which are at 2/3 of the depth of the basement to the bottom of the basement; second slope grading places are provided with anchor rods; the downward inclination angles of the anchor rods are gradually increased from top to bottom; a high-strength composite batten thin-bamboo-strip mesh is adopted for a surface layer; sprayed concrete is adopted for concrete for the surface layer; the middle part of the basement is provided with water-lowering wells; the water-lowering wells are arranged at a distance of every 12m to 15m.

Description

Subway station basement construction method for supporting
Technical field
The present invention relates to a kind of basement supporting, particularly to a kind of subway station basement construction method for supporting.
Background technology
With Chinese society expanding economy, the construction of subway station will certainly cause the disturbance of soil layer around.Work as surrounding The displacement of soil layer beyond compass, with regard to the safety of the buildings or structures around entail dangers to.When basement excavation and precipitation, by Stress condition in the soil body changes, and leads to basement surrounding soil to be subjected to displacement and corresponding ground deformation, underground simultaneously Room support system is also subject to the effect of lateral Water And Earth Pressures to produce internal force and deformation.If in addition, in setting inside basement Support, not only can increase construction cost, and very big inconvenience can be brought to excavating.If peace is reached by the method for slope The effect of full supporting is the problem that engineers and technicians are considered.
Content of the invention
Present invention solves the technical problem that being to provide a kind of subway station basement construction method for supporting, solve existing skill Art is not enough.
The present invention arranges electric osmose well in basement supporting outward flange, and electric osmose well is evenly arranged along basement supporting outward flange, Electric osmose well setting space is 2~2.5m, and electric osmose well is 5~7m with a distance from slope protection pile, and in electric osmose well, embedded well-point pipe is as the moon Pole, slope protection pile adopts cast-in-situ bored pile, and cast-in-situ bored pile setting space is 1.1~1.5m, and the reinforcing bar of slope protection pile, as anode, protects Plastic covering film above topsoil between slope stake and electric osmose well, reduces power consumption, increases electric osmose effect.Basement supporting adopts two Secondary slope mode, first time slope is ground surface to 2/3 basement depth position, and the slope gradient is 55 °~70 °, puts for the first time Slope position arranges high-strength compound lath, and short lower length on high-strength compound lath, to adapt to the Changing Pattern of native active earth pressure.High-strength Composite slats do circular, round diameter be 8~12mm, outer ring arrange evagination rib, make screw-shaped structure.High-strength compound Lath arranges core bore, and core bore is located at high-strength compound lath center, a diameter of 6~8mm of core bore, and grouting pressure is 0.3~0.5mpa, In work progress, high-strength compound lath core bore can eject slurries, makes weak soil produce splitting, in high-strength compound lath top shape Become the biomimetic features of similar fishbone, Soft Soil Layer is provided that larger anchor force.Meanwhile, in high-strength compound lath end core bore Carry out slip casing by pressure, form one soil cement choked flow curtain, block underground outdoor deep layer mud to underground indoor moveable.Have certainly The feature that steady ability is high, deformation is relatively small.
Second slope is 2/3 basement depth position to basement bottom, and the slope gradient is 30 °~50 °.Put for the second time Slope position arranges anchor pole.Anchor pole is angled downward and is gradually increased from top to bottom, and inclination angle is 15 °~20 °, by upper short lower long arrangement, anchor Pole length is 0.6~1.2 times of basement cutting depth, makes whole section constitute up-narrow and down-wide dykes and dams shape, to resist outside soil The soil pressure constantly increasing from top to bottom that body transmits.
In the present invention, anchor pole, using examination shaping pore-creating, gradually creeps in blanking movement repeatedly up and down, and motion amplitude is 50cm, Speed is 20~30 times/min, and jetting pressure will reach 0.3mpa.Spiral steel blade is installed at drill bit position, and spiral steel blade is by electricity Dynamic switch control rule, when motor switch is opened, spiral steel blade struts in umbrella.Spiral steel blade treats drill bit to the 1/3 of predetermined length Position, the spiral steel blade opening drill bit surrounding carries out reaming, and this position anchor pole is expanded into major diameter by drill bit spiral steel blade Cone;Spiral steel blade treats drill bit to 2/3 position of predetermined length, and the spiral steel blade opening drill bit surrounding carries out reaming, bores This position anchor pole is expanded into the cone of major diameter by head spiral steel blade;Spiral steel blade treats that drill bit, to predetermined length position, is opened The spiral steel blade of drill bit surrounding carries out reaming, and this position anchor pole is expanded into the cone of major diameter by drill bit spiral steel blade.Due to Different soil properties, slip casting difficulty is different, therefore takes different technologies scheme.Different counter bore diameters, reaming are taken for different soil properties Diameter to be controlled by spiral steel blade, and according to a large amount of engineering practices, for silt, spiral steel length of blade is 0.4m;For viscous Soil, spiral steel length of blade is 0.5m;For muck soil, spiral steel length of blade is 0.6m.
After the completion of carrying out spraying reaming using water during anchor bolt construction, carry out high-pressure rotary injection with cement mortar immediately, The cement mortar ratio of mud is 1.0~1.5, and the spray beam that cement mortar is formed gets up to be allowed to mix with cement mortar mortar agitation, makes Mortar becomes cement mortar aggregate, improves the intensity of slurry.High-pressure slip-casting pressure is 0.4~0.6mpa, to guarantee that cement mortar can be complete Full mud is cemented out it is ensured that the intensity of enlarged footing anchoring body.
Under equal conditions, anchor pole of the present invention is big 30%~40% than common bolt withdrawal resistance.
Surface layer adopts high-strength compound lath thin bamboo strip net, and facing concrete adopts gunite concrete, and sprayed concrete strength is c30 Or more than c30.Traditional bar-mat reinforcement is replaced using high-strength compound lath thin bamboo strip net, basement support pile is with high-strength compound lath even Forming composite structure together, can make basement obtain reliable supporting.High-strength compound lath thin bamboo strip net concrete formation is using spray Penetrate former, each horizontally disposed 3 fan nozzles in injection molding device both sides, nozzle with the adjacent concrete surface distance being washed is 6~8cm, injection pressure is 0.3~0.5mpa,
Pressure reduction well is set in the middle part of basement, and pressure reduction well setting distance is every 12~15m.
A diameter of 600~the 700mm of pressure reduction well, using pipe of concrete retaining wall, arranges filter pipe, filter pipe at artesian water position Outside is wound around nylon gauze, and filling 2~4mm peastone filtrate, using clay ball as sealing material.
Pressure reduction well is closed, pressure reduction well bottom hole absolute altitude above 2m position pours into ungauged regions and mixes before basement bottom board concreting Solidifying soil;By expanded rubber water-stop drilling rod down to designed elevation, using being connected anti-silk between water-stop and drilling rod after 24 hours Propose in well after drilling rod is dismantled;Under enter immersible pump more than water-stop water extract out;Monitor pressure reduction well with water-level observation meter Interior SEA LEVEL VARIATION, after confirming that pressure reduction well is shut completely, proposes suction pump, at designed elevation, well casing is blocked, use steel plate handle Well head is welded, and guarantees not seep water in pressure reduction well well head commissure.
If there is artesian water in place, in enlarged footing, injection waterglass carries out secondary grouting.Take in anchor bundle lever front end Setting is filled slurry sealing cloth bag method and is carried out blocking artesian water, sealing cloth bag is tied in body of rod free segment, away from aperture 50cm.Only starch Leave Grouting Pipe in cloth bag, treat that slip casting, benefit carry out filling slurry to only slurry cloth bag after the completion of starching immediately, full of rear, the slip casting mouth of pipe is carried out Closure, using the cement mortar cloth bag closure aperture expanding, reaches the purpose stoping artesian water excessive.
The present invention defines composite foundation by high-strength compound lath and soil, is rubbed by high-strength compound lath and the soil body in top The counter-pressure that resistance provides keeps stablizing of body of wall.Because bottom soil active earth pressure can be bigger, existed according to this loading characteristic The slope gradient of soil is slowed down in bottom, and forms the supporting of Complex subsurface room using hole reaming of anchor rod.
Brief description
Fig. 1 basement supporting construction schematic diagram.
Accompanying drawing mark: 1, slope protection pile, 2, electric osmose well, 3, high-strength compound lath, 4, anchor pole, 5, pressure reduction well.
Specific embodiment
Describe the present invention below in conjunction with accompanying drawing.
The present embodiment arranges electric osmose well 2 in basement supporting outward flange, and electric osmose well 2 is along the uniform cloth of basement supporting outward flange Put, electric osmose well 2 setting space is 2.2m, electric osmose well 2 is 6m with a distance from slope protection pile 1, in electric osmose well 2, embedded well-point pipe is as the moon Pole, slope protection pile 1 adopts cast-in-situ bored pile, and cast-in-situ bored pile setting space is 1.2m, and the reinforcing bar of slope protection pile 1 is as anode, bank protection Plastic covering film above topsoil between stake 1 and electric osmose well 2.Basement supporting is using slope mode twice, first time slope For ground surface to 2/3 basement depth position, the slope gradient is 55 °~70 °, and first time slope position arranges high-strength compound lath 3, short lower length on high-strength compound lath 3.High-strength compound lath 3 do circular, round diameter be 10mm, outer ring arrange evagination rib Bar, makes screw-shaped structure.High-strength compound lath 3 arranges core bore, and core bore is located at high-strength compound lath 3 center, and core bore is a diameter of 7mm, grouting pressure is 0.3~0.5mpa.
Second slope is 2/3 basement depth position to basement bottom, and the slope gradient is 35 °.Second slope portion Position setting anchor pole 4.Anchor pole 4 is angled downward and is gradually increased from top to bottom, and inclination angle is 18 °, by upper short lower long arrangement, anchor pole 4 length For 0.7 times of basement cutting depth.
Anchor pole 4, using examination shaping pore-creating, gradually creeps in blanking movement repeatedly up and down, and motion amplitude is 50cm, and speed is 20~30 times/min, jetting pressure will reach 0.3mpa.Spiral steel blade is installed at drill bit position, and spiral steel blade is by motor switch Control, when motor switch is opened, spiral steel blade struts in umbrella.Spiral steel blade treats drill bit to 1/3 position of predetermined length, The spiral steel blade opening drill bit surrounding carries out reaming, and this position anchor pole 4 is expanded into the cone of major diameter by drill bit spiral steel blade; Spiral steel blade treats drill bit to 2/3 position of predetermined length, and the spiral steel blade opening drill bit surrounding carries out reaming, drill bit spiral This position anchor pole 4 is expanded into the cone of major diameter by steel blade;Spiral steel blade treats that drill bit, to predetermined length position, opens drill bit four The spiral steel blade in week carries out reaming, and this position anchor pole 4 is expanded into the cone of major diameter by drill bit spiral steel blade.Spiral steel blade Length selects 0.5m.
After the completion of carrying out spraying reaming using water in anchor pole 4 work progress, carry out high-pressure rotary injection with cement mortar immediately, The cement mortar ratio of mud is 1.2, and high-pressure slip-casting pressure is 0.4~0.6mpa.
Surface layer adopts high-strength compound lath thin bamboo strip net, and facing concrete adopts gunite concrete, and sprayed concrete strength is c30.High-strength compound lath thin bamboo strip net concrete formation adopts injection molding device, each horizontally disposed 3 sectors in injection molding device both sides Nozzle, nozzle is 7cm with the adjacent concrete surface distance being washed, and injection pressure is 0.3~0.5mpa.
Pressure reduction well 5 is set in the middle part of basement, and pressure reduction well 5 setting distance is every 12~15m.
The a diameter of 650mm of pressure reduction well 5, using pipe of concrete retaining wall, arranges filter pipe at artesian water position, outside filter pipe It is wound around nylon gauze, filling 2~4mm peastone filtrate, using clay ball as sealing material.
Pressure reduction well 5 is closed, the above 2m position of pressure reduction well 5 bottom hole absolute altitude pours into ungauged regions before basement bottom board concreting Concrete;By expanded rubber water-stop drilling rod down to designed elevation, utilize after 24 hours and be connected between water-stop and drilling rod instead Silk proposes after drilling rod is dismantled in well;Under enter immersible pump more than water-stop water extract out;Monitor step-down with water-level observation meter SEA LEVEL VARIATION in well 5, after confirming that pressure reduction well 5 is shut completely, proposes suction pump, at designed elevation, well casing is blocked, use steel Plate is welded well head, and guarantees not seep water in pressure reduction well 5 well head commissure.
If there is artesian water in place, in enlarged footing, injection waterglass carries out secondary grouting.Take in anchor bundle lever front end Setting is filled slurry sealing cloth bag method and is carried out blocking artesian water, sealing cloth bag is tied in body of rod free segment, away from aperture 50cm.Only starch Leave Grouting Pipe in cloth bag, treat that slip casting, benefit carry out filling slurry to only slurry cloth bag after the completion of starching immediately, full of rear, the slip casting mouth of pipe is carried out Closure, using the cement mortar cloth bag closure aperture expanding, reaches the purpose stoping artesian water excessive.
The present embodiment monitoring finds that maximum outwards horizontal displacement is 10mm, and maximum inwardly horizontal displacement is 15mm.Observation knot Fruit, all in the range of security control, illustrates that supporting construction of the present invention is safe and reliable, malformation is little, and allomeric function is preferable.

Claims (1)

1. a kind of subway station basement construction method for supporting, is characterized in that arranging electric osmose well, electricity in basement supporting outward flange Seepage well is evenly arranged along basement supporting outward flange, and electric osmose well setting space is 2~2.5m, and electric osmose well is with a distance from slope protection pile 5~7m, in electric osmose well, as negative electrode, slope protection pile adopts cast-in-situ bored pile to embedded well-point pipe, and cast-in-situ bored pile setting space is 1.1 ~1.5m, the reinforcing bar of slope protection pile as anode, plastic covering film above topsoil between slope protection pile and electric osmose well;Basement props up Using slope mode twice, first time slope is ground surface to 2/3 basement depth position to shield, and the slope gradient is 55 °~70 °, First time slope position arranges high-strength compound lath, short lower length on high-strength compound lath;Second slope is 2/3 basement depth Position to basement bottom, the slope gradient is 30 °~50 °;Second slope position arranges anchor pole;Anchor pole be angled downward from upper and Under be gradually increased, inclination angle is 15 °~20 °, and by upper short lower long arrangement, rock-bolt length is 0.6~1.2 times of basement cutting depth; Surface layer adopts high-strength compound lath thin bamboo strip net, and facing concrete adopts gunite concrete, and sprayed concrete strength is more than c30;Ground Pressure reduction well is set in the middle part of lower room, and pressure reduction well setting distance is 12~15m;
Circle made by high-strength compound lath, and round diameter is 8~12mm, and outer ring arranges the rib of evagination, makes screw-shaped structure; High-strength compound lath arranges core bore, and core bore is located at high-strength compound lath center, a diameter of 6~8mm of core bore, and grouting pressure is 0.3 ~0.5mpa.
CN201510234313.8A 2015-04-29 2015-04-29 Construction method of basement support for subway station Expired - Fee Related CN104831737B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201610288380.2A CN105926670B (en) 2015-04-29 2015-04-29 The basement construction method of subway station
CN201610288400.6A CN105926671B (en) 2015-04-29 2015-04-29 The basement supporting construction technology of subway station
CN201610288398.2A CN105971008B (en) 2015-04-29 2015-04-29 The basement method for protecting support of subway station
CN201510234313.8A CN104831737B (en) 2015-04-29 2015-04-29 Construction method of basement support for subway station
CN201610288427.5A CN105986580B (en) 2015-04-29 2015-04-29 A kind of subway station basement construction method for supporting

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Application Number Priority Date Filing Date Title
CN201510234313.8A CN104831737B (en) 2015-04-29 2015-04-29 Construction method of basement support for subway station

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CN201610288427.5A Division CN105986580B (en) 2015-04-29 2015-04-29 A kind of subway station basement construction method for supporting
CN201610288400.6A Division CN105926671B (en) 2015-04-29 2015-04-29 The basement supporting construction technology of subway station
CN201610288380.2A Division CN105926670B (en) 2015-04-29 2015-04-29 The basement construction method of subway station
CN201610288398.2A Division CN105971008B (en) 2015-04-29 2015-04-29 The basement method for protecting support of subway station

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CN104831737A CN104831737A (en) 2015-08-12
CN104831737B true CN104831737B (en) 2017-01-18

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CN201510234313.8A Expired - Fee Related CN104831737B (en) 2015-04-29 2015-04-29 Construction method of basement support for subway station
CN201610288398.2A Active CN105971008B (en) 2015-04-29 2015-04-29 The basement method for protecting support of subway station
CN201610288427.5A Active CN105986580B (en) 2015-04-29 2015-04-29 A kind of subway station basement construction method for supporting
CN201610288400.6A Active CN105926671B (en) 2015-04-29 2015-04-29 The basement supporting construction technology of subway station
CN201610288380.2A Active CN105926670B (en) 2015-04-29 2015-04-29 The basement construction method of subway station

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CN201610288398.2A Active CN105971008B (en) 2015-04-29 2015-04-29 The basement method for protecting support of subway station
CN201610288427.5A Active CN105986580B (en) 2015-04-29 2015-04-29 A kind of subway station basement construction method for supporting
CN201610288400.6A Active CN105926671B (en) 2015-04-29 2015-04-29 The basement supporting construction technology of subway station
CN201610288380.2A Active CN105926670B (en) 2015-04-29 2015-04-29 The basement construction method of subway station

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Publication number Publication date
CN105986580B (en) 2018-09-04
CN105971008B (en) 2018-09-04
CN105926670A (en) 2016-09-07
CN105986580A (en) 2016-10-05
CN105926670B (en) 2018-03-02
CN105926671A (en) 2016-09-07
CN104831737A (en) 2015-08-12
CN105971008A (en) 2016-09-28
CN105926671B (en) 2018-02-27

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