CN109457705A - A kind of Open Cut Method construction method - Google Patents

A kind of Open Cut Method construction method Download PDF

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Publication number
CN109457705A
CN109457705A CN201811172030.5A CN201811172030A CN109457705A CN 109457705 A CN109457705 A CN 109457705A CN 201811172030 A CN201811172030 A CN 201811172030A CN 109457705 A CN109457705 A CN 109457705A
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CN
China
Prior art keywords
construction
dewatering
area
precipitation
well
Prior art date
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Pending
Application number
CN201811172030.5A
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Chinese (zh)
Inventor
汪良
刘继鹏
庞前凤
孙守东
郭少杰
徐小燕
王新源
刘流
刘红记
唐峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Railway 22nd Bureau Group Co Ltd
China Railway 22nd Bureau Group Urban Rail Engineering Co., Ltd.
Original Assignee
China Railway 22nd Bureau Group Co Ltd
China Railway 22nd Bureau Group Urban Rail Engineering Co., Ltd.
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.)
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Application filed by China Railway 22nd Bureau Group Co Ltd, China Railway 22nd Bureau Group Urban Rail Engineering Co., Ltd. filed Critical China Railway 22nd Bureau Group Co Ltd
Priority to CN201811172030.5A priority Critical patent/CN109457705A/en
Publication of CN109457705A publication Critical patent/CN109457705A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • 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
    • 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
    • E02D29/05Underground 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 at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench

Abstract

The invention discloses a kind of Open Cut Method construction methods, including 1), construction of diaphragm wall: the construction of diaphragm wall mainly includes construction of diaphragm wall, construction of guide wall, slurrying operation, trenching construction, diaphragm wall connection construction;2), interim column construction: the interim column is the structure that bored concrete pile is arranged in interim fashioned iron column;3), crown beam and Construction of Supporting: the crown beam and Construction of Supporting mainly include crown beam construction, building enclosure Construction of Supporting;4), dewatering construction;5), deep foundation pit earthwork digging is constructed;6), pipeline protection is constructed.Tunnel structure stability is more preferable after Open Cut Method construction technology according to the present invention can ensure open cut, while more practical experiences being added on the basis of standard, can greatly shorten the duration and save construction cost.

Description

A kind of Open Cut Method construction method
Technical field
The present invention relates to subway, station construction technical field, and in particular to a kind of for subway, station integrated construction Open Cut Method construction method.
Background technique
With the continuous improvement of people's quality of life, people's trip is also more and more convenient, the traffic such as subway, intercity track Tool is constantly generalized in city;It is known about by the people of subway or intercity railway trip, subway or other traffic works Tool requires designated lane, usually in underground excavation channel, is then laid with upper corresponding track, makes for vehicles operation With.
In the prior art, underground excavation project is larger, and it is higher to generally require more mature construction company and technology Construction team can complete;There are many kinds of construction methods in the prior art, but more for landform and surrounding enviroment Complicated place, excavation project generally all have certain difficulty;At this stage for station, the most uses of excavation of subway construction The form of construction work of open cut, but open-cut mode is all in strict accordance with construction reference (national standard or row in the prior art Industry standard) it executes, get up inevitably to have certain difficulty for some special place (such as compared with large span) constructions, after also resulting in Phase construction quality is poor.
Summary of the invention
The object of the present invention is to provide a kind of saving construction period, ensure that construction in later period quality is preferable, adapts to compared with large span The Open Cut Method construction method of field construction.
To achieve the goals above, the invention provides the following technical scheme:
A kind of Open Cut Method construction method disclosed by the invention mainly includes following construction procedure:
1), construction of diaphragm wall: the construction of diaphragm wall mainly includes construction of diaphragm wall, construction of guide wall, mud Prepare operation, trenching construction, diaphragm wall connection construction;
2), interim column construction: the interim column is the structure that bored concrete pile is arranged in interim fashioned iron column;
3), crown beam and Construction of Supporting: the crown beam and Construction of Supporting mainly include that crown beam construction, building enclosure support are applied Work;
4), dewatering construction: the dewatering construction mainly includes dividing section precipitation, precipitation and drainage construction, dewatering well to set Meter calculating, dewatering well well spacing and dewatering well arrangement, precipitation maintenance, drainage system, the post-processing of dewatering well, dewatering construction are protected Card measure;
5), deep foundation pit earthwork digging is constructed;
6), pipeline protection is constructed.
Further, the wall construction of leading in the construction of guide wall in the step 1) is mixed using " ┓ ┏ " type is monolithic reinforced Xtah Crude Clay structure, the depth for leading wall is 2.0m, described to lead the strength grade of concrete that wall uses as C25 with a thickness of 200mm, The external mold for leading wall uses clay model.
Further, when construction site soil property is bad or clay layer infiltration is serious, the external mold for leading wall uses thickness The stock mould of 120mm.
Further, the mud in the step 1) includes:
Bentonite, 8% mass fraction of water weight;
CMC, 0.05% mass fraction of water weight;
Dispersing agent, 0.3% mass fraction of water weight.
Further, the interim column in the step 2) using profile steel concrete column as each road cross-brace among Vertical supporting.
Further, the crown beam construction in the step 3) connects with being excavated to for the earthwork of crown beam position is carried out slope Wall designs top mark height, is manually abolished using pneumatic pick, connects wall top concrete laitance with clearing to designed elevation;
Building enclosure Construction of Supporting in the step 3) includes concrete Construction of Supporting and the construction of concrete supporting removal;
The support of first of concrete and the crown beam synchronous construction of the concrete Construction of Supporting, first dig pit earthwork to first Bottom absolute altitude is supported, using artificial flat bottom, is reinforced on the outside of template using steel pipe, concrete support reaches after design strength can be into Row next step earth excavation;Concrete support and crown beam pour together, forbid supporting junction spare interface, construction in crown beam and concrete Before need to be laid with 50mm thickness concrete cushion and brushing release agent in support bottom.
Further, dewatering construction is divided into four operation areas, respectively the first dewatering operation area, in the step 4) Two dewatering operation areas, third dewatering operation area, the 4th dewatering operation area;
The first dewatering operation section length is 420m, width 20.37m, and the precipitation in first dewatering operation area It is 18~22m that spacing, which is arranged, in well, amounts to 25 mouthfuls;
The second dewatering operation section length is 262m, and width is 47.5~72.9m, and second dewatering operation area is Single well precipitation, and the dewatering well setting spacing in second dewatering operation area is 17.5m, amounts to 48 mouthfuls;
The third dewatering operation section length is 821m, and width is 13.4~19.4m, and third dewatering operation area is Single well precipitation, and the dewatering well setting spacing in third dewatering operation area is 20m, amounts to 42 mouthfuls;
The 4th dewatering operation section length is 530m, and width is 13.4~19.4m, and the 4th dewatering operation area is Single well precipitation, and the dewatering well setting spacing in the 4th dewatering operation area is 20m, amounts to 31 mouthfuls.
Further, first dewatering operation area, 23.0~24.1m of ground elevation, layer of sand bottom surface elevation are 7.69m, And the precipitation well depth in first dewatering operation area is 18.86m;
Second dewatering operation area, 23.5~24.5m of ground elevation, layer of sand bottom surface elevation are -2.2m, and described second The precipitation well depth in dewatering operation area is 29.4m;
Third dewatering operation area 20~24.7m of ground elevation, floor structure elevation are 7.265m, and the third The precipitation well depth in dewatering operation area is 18.085m;
4th dewatering operation area, the 26.7~34m of ground elevation, floor structure elevation are 14.61m, and the described 4th The precipitation well depth in dewatering operation area is 18.74m.
In the above-mentioned technical solutions, a kind of Open Cut Method construction method provided by the invention has following
The utility model has the advantages that
1, tunnel structure stability is more preferable after Open Cut Method construction technology according to the present invention can ensure open cut, together When more practical experiences are added on the basis of standard, can greatly shorten the duration and save construction cost.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be in embodiment Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only to record in the present invention Some embodiments are also possible to obtain other drawings based on these drawings for those of ordinary skill in the art.
Fig. 1 is a kind of construction of diaphragm wall technique flow chart of Open Cut Method construction method provided in an embodiment of the present invention;
Fig. 2 is a kind of interim column construction technology process of Open Cut Method construction method provided in an embodiment of the present invention Figure;
Fig. 3 is a kind of crown beam construction flow chart of Open Cut Method construction method provided in an embodiment of the present invention;
Fig. 4 is a kind of dewatering well construction flow chart of Open Cut Method construction method provided in an embodiment of the present invention.
Specific embodiment
In order to make those skilled in the art more fully understand technical solution of the present invention, below in conjunction with attached drawing to this Invention is further detailed.
As shown in Figures 1 to 4, a kind of Open Cut Method construction method provided in an embodiment of the present invention mainly includes following Construction procedure:
1), construction of diaphragm wall: construction of diaphragm wall mainly includes construction of diaphragm wall, construction of guide wall, slurrying Operation, trenching construction, diaphragm wall connection construction;
2), interim column construction: interim column is the structure that bored concrete pile is arranged in interim fashioned iron column;
3), crown beam and Construction of Supporting: crown beam and Construction of Supporting mainly include crown beam construction, building enclosure Construction of Supporting;
4), dewatering construction: dewatering construction mainly includes dividing section precipitation, precipitation and drainage construction, dewatering well design meter Calculation, dewatering well well spacing and dewatering well arrangement, precipitation maintenance, drainage system, the post-processing of dewatering well, dewatering construction guarantee are arranged It applies;
5), deep foundation pit earthwork digging is constructed;
6), pipeline protection is constructed.
Preferably, the wall construction of leading in the construction of guide wall in above-mentioned step 1) is mixed using " ┓ ┏ " type is monolithic reinforced Xtah Crude Clay structure leads the depth of wall as 2.0m and leads the strength grade of concrete that wall uses with a thickness of 200mm as C25, leads the outer of wall Mould uses clay model.In addition, the external mold for leading wall is adopted when construction site soil property is bad in the present embodiment or clay layer infiltration is serious With the stock mould of thickness 120mm.
Finally, as the present embodiment preferred embodiment, the mud in above-mentioned step 1) includes:
Bentonite, 8% mass fraction of water weight;
CMC, 0.05% mass fraction of water weight;
Dispersing agent, 0.3% mass fraction of water weight.
The mud of trenching construction changes its technical indicator by soil pollution, should not be re-used for grooving shield Wall.Therefore, the mud extracted out out of slot is introduced into sedimentation basin, by being pumped into mud pit after precipitating, then send to following in slot Ring.When the technical indicator of mud varies widely, such as specific gravity > 1.25, when viscosity > 50s, it is necessary to which discarded, discarded slurry is adopted Designated place discharge is transported to closing vehicle.
In addition, surveying and locating guide wall of underground continuous wall middle line and excavation line, lead and put 50mm outside clear span relatively design within the walls, survey Pay attention to introducing the elevational point of diaphram wall when amount.
Wall is led to excavate using 0.8m3Backacter excavates, and manually repairs slope molding.It is dug by wall excavation line and elevational point is led Guide channel, bottom of trench is smooth, and furrow width cannot be less than design value, the straight compacting of furrow bank.It leads wall base bottom and sets 5cm thickness C15 concrete cushion, Leading wall wall bottom must be located on bottom blinding concrete.
By leading the assembling reinforcement in guide channel of wall design size, it is desirable that main reinforcement is straight, and stirrup is closely connected, and binding securely, it is vertical to lead wall It is connected to main reinforcement using welding manner, single welding is not less than 10d.
Formwork erection: template uses 15mm glued board, and surface must be smooth, smooth, firm.Formwork edge joint should be tight, adopts With the embedding tight gap of double-sided adhesive tape.Template master is stupefied to use 48@steel pipe of Φ, vertical spacing 600mm.50 × 100 lumps of wood of secondary stupefied use, Step pitch 300mm, perforation arrangement.To support 600 × 600mm of screw rod spacing.The template requirement that inside installs is vertical smooth, guarantees to tear open Two inner wall surfaces are respectively the wide half of wall away from diaphram wall axis after mould.
Casting concrete: pouring C25 concrete, and casting process answers two sides while constructing.It wants to shake when pouring in casting process Puddling is real, forbids leakage.Top surface needs to smooth out.
Demoulding: leading the 80% rear collapsible die that wall concrete strength reaches design strength, will should be led immediately after tearing open between wall plus Support sets 2 100 × 100 lumps of wood support together, the road branch tie distance 2m/ in guide groove.
The closely knit backfill of rolling earth behind retaining wall requirement is led, frog hammer compacting can be used, construction of guide wall seam position should connect with underground Continuous wall construction joint position is staggered, every section of construction of guide wall length 30-36m.
Preferably, the interim column in above-mentioned step 2) using profile steel concrete column as each road cross-brace among Vertical supporting, play the role of preventing the possible deformation of the upper and lower both direction of cross-brace or unstability.Column construction peace It comes and constructs simultaneously with every section of cast-in-situ bored pile;Column belongs to temporary support, and main structure construction finishes first of support of dismounting When, column need to be removed simultaneously.Stake top absolute altitude is to tamp processing using compaction grouting up to ground segment.Before steel column decentralization, need to report Supervising engineer checks to be used further to construct after machining accuracy and quality are met the requirements.Fashioned iron lattice skeleton verticality and positioning accurate Degree meets design and related specification requirement.
Preferably, the crown beam construction in above-mentioned step 3) connects with being excavated to for the earthwork of crown beam position is carried out slope Wall designs top mark height, is manually abolished using pneumatic pick, connects wall top concrete laitance with clearing to designed elevation;In step 3) Building enclosure Construction of Supporting include concrete Construction of Supporting and concrete supporting removal construction;
The support of first of concrete and the crown beam synchronous construction of concrete Construction of Supporting, pit earthwork is dug to first support first Bottom absolute altitude is reinforced on the outside of template using steel pipe using artificial flat bottom, and concrete support can carry out down after reaching design strength One step earth excavation;Concrete support and crown beam pour together, forbid supporting junction spare interface in crown beam and concrete, need before construction 50mm thickness concrete cushion and brushing release agent are laid in support bottom.
1. earth excavation and cutting ground-connecting-wall top laitance
The earthwork progress slope of crown beam position is excavated to ground-connecting-wall design top mark height and (reserves working face in ground-connecting-wall two sides Width is 500mm), it is manually abolished using pneumatic pick, connects wall top concrete laitance with clearing to designed elevation.
2. template construction
Template is assembled using 15mm thickness bamboo slab rubber, reinforces and uses split bolt, 48 steel pipe of φ and 100 × 100 lumps of wood, mould Uniform brushing release agent before plate installation.
3. reinforcement construction
After abolishing ground-connecting-wall top concrete laitance, straightening ground-connecting-wall main reinforcement simultaneously guarantees that anchoring into anchorage length L in crown beam is 37d。
Reinforcing bar semi-finished product are stacked neat and carry out adjustment notch after the completion of adding according to specification, model.Construction before again against Design drawing is checked, is transported to construction site after inspection is errorless.
Main reinforcement connection is using mechanical connection when reinforcing bar is bound.Same section connector must not exceed 50%.Every section of crown beam reinforcing bar The lap of splice is reserved for the construction of lower section crown beam, and is staggered not less than 35d.
4. concreting
Crown beam concrete grade is C30, is poured using concrete mixer, poker vibrator vibrates, and vibrates Spacing about 50cm until no a large amount of steam bubbles generate, prevents concrete vibrating deficiency or the mistake at one with concrete surface bleeding It shakes and occurs to run mould phenomenon.And carry out plastic covering film and watering health in time after concrete initial set.Design to be achieved is strong Next layer of earth excavation can be carried out after degree.
Preferably, dewatering construction is divided into four operation areas, respectively the first dewatering operation area, in above-mentioned step 4) Two dewatering operation areas, third dewatering operation area, the 4th dewatering operation area;
First dewatering operation section length is 420m, width 20.37m, and between the dewatering well setting in the first dewatering operation area Away from for 18~22m, amount to 25 mouthfuls;
Second dewatering operation section length is 262m, and width is 47.5~72.9m, and the second dewatering operation area is single well drop Water, and the dewatering well setting spacing in the second dewatering operation area is 17.5m, amounts to 48 mouthfuls;
Third dewatering operation section length is 821m, and width is 13.4~19.4m, and third dewatering operation area is single well drop Water, and the dewatering well setting spacing in third dewatering operation area is 20m, amounts to 42 mouthfuls;
4th dewatering operation section length is 530m, and width is 13.4~19.4m, and the 4th dewatering operation area is single well drop Water, and the dewatering well setting spacing in the 4th dewatering operation area is 20m, amounts to 31 mouthfuls.
In addition, first dewatering operation area 23.0~24.1m of ground elevation in the present embodiment, layer of sand bottom surface elevation are 7.69m, and the precipitation well depth in the first dewatering operation area is 18.86m;
Second dewatering operation area 23.5~24.5m of ground elevation, layer of sand bottom surface elevation are -2.2m, and the second dewatering operation The precipitation well depth in area is 29.4m;
Third dewatering operation area 20~24.7m of ground elevation, floor structure elevation are 7.265m, and third dewatering operation The precipitation well depth in area is 18.085m;
4th dewatering operation area 26.7~34m of ground elevation, floor structure elevation are 14.61m, and the 4th dewatering operation The precipitation well depth in area is 18.74m.
It is specific:
First dewatering operation area: predicted that calculation formula is as follows by bar shaped foundation pit diving complete penetration of well prediction model:
Q-water yield (m3/d);
K-infiltration coefficient (m/d);Take 10
L-bar shaped foundation pit length (m);Take 420
B-bar shaped foundation pit width (m);Take 20.67m
H-static level to aquifer floor elevation distance (m);Take 16.31m
R-the radius of influence (m),Take 416.59m;
S-design water level drawdown (m), takes 16.31m
Then Pit Discharge are as follows:
Pit Discharge predicts explanation
It is 4945.41m according to the foundation pit total yield that prediction calculates3/d。
Second dewatering operation area: predicted that calculation formula is as follows by bar shaped foundation pit diving complete penetration of well prediction model:
Q-water yield (m3/d);
K-infiltration coefficient (m/d);Take 10
L- bar shaped foundation pit length (m);Take 246
B- bar shaped foundation pit width (m);Take 73.2m
H- static level to aquifer floor elevation distance (m);Take 26m
R-the radius of influence (m), (Take 594.51m;
S-design water level drawdown (m), takes 18.435m
Then Pit Discharge are as follows:
Pit Discharge predicts explanation
It is 9545.85m according to the foundation pit total yield that prediction calculates3/d。
Third dewatering operation area: predicted that calculation formula is as follows by bar shaped foundation pit diving complete penetration of well prediction model:
Q-water yield (m3/d);
K-infiltration coefficient (m/d);Take 10
L-bar shaped foundation pit length (m);Take 821
B-bar shaped foundation pit width (m);Take 13.4m
H-static level to aquifer floor elevation distance (m);Take 16.33m
R-the radius of influence (m),Take 334.81m;
S-design water level drawdown (m), takes 13.1m
Then Pit Discharge are as follows:
Pit Discharge predicts explanation
It is 8343.85m according to the foundation pit total yield that prediction calculates3/d。
4th dewatering operation area: predicted that calculation formula is as follows by bar shaped foundation pit diving complete penetration of well prediction model:
Q-water yield (m3/d);
K-infiltration coefficient (m/d);Take 10
L-bar shaped foundation pit length (m);Take 530m
B-bar shaped foundation pit width (m);Take 13.4m
H-static level to aquifer floor elevation distance (m);Take 15.85m
R-the radius of influence (m),Take 283.02m;
S-design water level drawdown (m), takes 11.24m
Then Pit Discharge are as follows:
Pit Discharge predicts explanation
It is 6238.85m according to the foundation pit total yield that prediction calculates3/d。
Above-mentioned individual well displacement:
Dewatering well proposed adoption diameter 600mm pipe well, built-in filtering pipe diameter 273mm are then used
In formula:
R is dewatering well well casing diameter, takes 273mm
L is dewatering well water inlet chimney filter length, (considering the influence of precipitation depth, the length of filter takes 1m)
K is infiltration coefficient, takes 10.
In the above-mentioned technical solutions, a kind of Open Cut Method construction method provided by the invention has below beneficial to effect Fruit:
Tunnel structure stability is more preferable after Open Cut Method construction technology according to the present invention can ensure open cut, simultaneously More practical experiences are added on the basis of standard, the duration can be greatly shortened and save construction cost.
It is above that certain exemplary embodiments of the invention are only described by way of explanation, undoubtedly, for ability The those of ordinary skill in domain without departing from the spirit and scope of the present invention can be with a variety of different modes to institute The embodiment of description is modified.Therefore, above-mentioned attached drawing and description are regarded as illustrative in nature, and should not be construed as to this hair The limitation of bright claims.

Claims (8)

1. a kind of Open Cut Method construction method, which is characterized in that mainly include following construction procedure:
1), construction of diaphragm wall: the construction of diaphragm wall mainly includes construction of diaphragm wall, construction of guide wall, slurrying Operation, trenching construction, diaphragm wall connection construction;
2), interim column construction: the interim column is the structure that bored concrete pile is arranged in interim fashioned iron column;
3), crown beam and Construction of Supporting: the crown beam and Construction of Supporting mainly include crown beam construction, building enclosure Construction of Supporting;
4), dewatering construction: the dewatering construction mainly includes dividing section precipitation, precipitation and drainage construction, dewatering well design meter Calculation, dewatering well well spacing and dewatering well arrangement, precipitation maintenance, drainage system, the post-processing of dewatering well, dewatering construction guarantee are arranged It applies;
5), deep foundation pit earthwork digging is constructed;
6), pipeline protection is constructed.
2. a kind of Open Cut Method construction method according to claim 1, which is characterized in that lead wall in the step 1) Wall construction of leading in construction uses " ┓ ┏ " type monolithic reinforced-concrete structures, and the depth for leading wall is 2.0m, with a thickness of 200mm, described to lead the strength grade of concrete that wall uses as C25, the external mold for leading wall uses clay model.
3. a kind of Open Cut Method construction method according to claim 2, which is characterized in that construction site soil property it is bad or When the infiltration of person's clay layer is serious, the external mold for leading wall uses the stock mould of thickness 120mm.
4. a kind of Open Cut Method construction method according to claim 1, which is characterized in that the mud in the step 1) Include:
Bentonite, 8% mass fraction of water weight;
CMC, 0.05% mass fraction of water weight;
Dispersing agent, 0.3% mass fraction of water weight.
5. a kind of Open Cut Method construction method according to claim 1, which is characterized in that interim in the step 2) Column is using profile steel concrete column as the vertical supporting among each road cross-brace.
6. a kind of Open Cut Method construction method according to claim 1, which is characterized in that the crown beam in the step 3) Construction is excavated to ground-connecting-wall design top mark height for the earthwork of crown beam position is carried out slope, is manually abolished using pneumatic pick, clearly Except ground-connecting-wall top concrete laitance to designed elevation;
Building enclosure Construction of Supporting in the step 3) includes concrete Construction of Supporting and the construction of concrete supporting removal;
The support of first of concrete and the crown beam synchronous construction of the concrete Construction of Supporting, first dig pit earthwork to first of support bottom Absolute altitude is reinforced on the outside of template using steel pipe using artificial flat bottom, and concrete support can carry out in next step after reaching design strength Earth excavation;Concrete support and crown beam pour together, forbid supporting junction spare interface in crown beam and concrete, need to support before construction Bottom is laid with 50mm thickness concrete cushion and brushing release agent.
7. a kind of Open Cut Method construction method according to claim 1, which is characterized in that precipitation is applied in the step 4) Work point is four operation areas, respectively the first dewatering operation area, the second dewatering operation area, third dewatering operation area, the 4th precipitation Operation area;
The first dewatering operation section length is 420m, width 20.37m, and the dewatering well in first dewatering operation area is set Setting spacing is 18~22m, amounts to 25 mouthfuls;
The second dewatering operation section length is 262m, and width is 47.5~72.9m, and second dewatering operation area is single well Precipitation, and the dewatering well setting spacing in second dewatering operation area is 17.5m, amounts to 48 mouthfuls;
The third dewatering operation section length is 821m, and width is 13.4~19.4m, and third dewatering operation area is single well Precipitation, and the dewatering well setting spacing in third dewatering operation area is 20m, amounts to 42 mouthfuls;
The 4th dewatering operation section length is 530m, and width is 13.4~19.4m, and the 4th dewatering operation area is single well Precipitation, and the dewatering well setting spacing in the 4th dewatering operation area is 20m, amounts to 31 mouthfuls.
8. a kind of Open Cut Method construction method according to claim 7, which is characterized in that first dewatering operation area 23.0~24.1m of ground elevation, layer of sand bottom surface elevation is 7.69m, and the precipitation well depth in first dewatering operation area is 18.86m;
Second dewatering operation area, 23.5~24.5m of ground elevation, layer of sand bottom surface elevation are -2.2m, and second precipitation The precipitation well depth of operation area is 29.4m;
Third dewatering operation area 20~24.7m of ground elevation, floor structure elevation is 7.265m, and the third precipitation is made The precipitation well depth in industry area is 18.085m;
4th dewatering operation area, the 26.7~34m of ground elevation, floor structure elevation is 14.61m, and the 4th precipitation is made The precipitation well depth in industry area is 18.74m.
CN201811172030.5A 2018-10-09 2018-10-09 A kind of Open Cut Method construction method Pending CN109457705A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110397079A (en) * 2019-07-06 2019-11-01 中铁二十五局集团第五工程有限公司 Marine facies rich water karst strata open-cut station construction technology
CN111021363A (en) * 2019-12-31 2020-04-17 广东顺德电力设计院有限公司 Method and system for protecting cable by using bailey truss

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110397079A (en) * 2019-07-06 2019-11-01 中铁二十五局集团第五工程有限公司 Marine facies rich water karst strata open-cut station construction technology
CN110397079B (en) * 2019-07-06 2021-12-17 中铁二十五局集团第五工程有限公司 Construction process for open cut station of marine facies water-rich karst stratum
CN111021363A (en) * 2019-12-31 2020-04-17 广东顺德电力设计院有限公司 Method and system for protecting cable by using bailey truss

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