CN108086327A - A kind of special-shaped construction method of deep foundation ditch of adjacent subway tunnel - Google Patents
A kind of special-shaped construction method of deep foundation ditch of adjacent subway tunnel Download PDFInfo
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- CN108086327A CN108086327A CN201810055222.1A CN201810055222A CN108086327A CN 108086327 A CN108086327 A CN 108086327A CN 201810055222 A CN201810055222 A CN 201810055222A CN 108086327 A CN108086327 A CN 108086327A
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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Abstract
The invention discloses a kind of special-shaped construction method of deep foundation ditch of adjacent subway tunnel, include the following steps：Preparation of construction, construction deployment, the installation of support, the dismounting that foundation pit plane is excavated, foundation pit vertically excavates, foundation pit periphery is protected and supported.The present invention adds trestle work structure and water-stop curtain in the construction process in order to improve construction quality and process.The present invention constructs to the deep basal pit of adjacent subway tunnel by using the above method, in entire work progress, the horizontal displacement displacement of monitoring subway tunnel, sedimentation deformation amount and convergence displacement in real time, subway tunnel horizontal displacement ＜ ± 3mm, subway tunnel sedimentation deformation amount ＜ ± 5mm, subway tunnel convergence displacement ＜ ± 5mm, it is 95% to draw the non-hypervisor value rate of adjacent subway tunnel displacement, beyond predetermined 90% non-hypervisor announcement rate, construction quality is substantially increased；Maintenance frequency is reduced, adds economic benefit；Ensure the safety of subway tunnel.
Description
Technical field
The invention belongs to technical field of building construction, and in particular to a kind of neighbouring subway that can effectively control subway displacement
The special-shaped construction method of deep foundation ditch in tunnel.
Background technology
The excavation of deep basal pit is a great engineering project, and has park, street, subway entrance etc. to set for periphery
The place applied, the construction safety of deep basal pit is most important, and constructing operation is improper easily to cause park, street, subway tunnel
Horizontal displacement and settling amount are more than safe distance, bring great security risk.
The content of the invention
For the above-mentioned problems in the prior art, subway position can be effectively controlled it is an object of the invention to provide a kind of
The special-shaped construction method of deep foundation ditch of the adjacent subway tunnel of shifting amount.
The special-shaped construction method of deep foundation ditch of a kind of adjacent subway tunnel, it is characterised in that include the following steps：It applies
Working drawing is standby, construction deployment, support installation, foundation pit plane excavate, foundation pit vertically excavate, foundation pit periphery protection and support tear open
It removes.
The special-shaped construction method of deep foundation ditch of a kind of adjacent subway tunnel, it is characterised in that specifically include following step
Suddenly：
1）Preparation of construction：Excavator, muck haulage truck, wherein 2, PC300 types excavator, 8, PC200 types excavator, PC100 are dug
Native 2, machine, 2, PC60 excavators, the truck 50 of muck haulage 20t, PC300 types digging machine and PC200 types digging machine are large area soil
The machinery just excavated, PC100 type digging machines are responsible for the earth excavation of part inner corner trim, fringe region, and PC60 type digging machines are responsible for part slope
Road and the adjacent finishing for excavating interregional height difference side slope；
2）Construction deployment：Before construction, first supporting is cut the earth again, and supporting or support strength reach design requirement, then carries out layering point
Section is excavated；
3）Foundation pit plane is excavated：It is excavated using blockette, stratified form, vertically point 4 staged constructions, are laterally divided into 7 blocks
Construction, i.e., each stage are divided into 7 blocks：
301）First stage：It cuts the earth to Guan Liang bottom, from left to right will be divided into the first block, the secondth area between soil and Guan Liang bottom naturally
Block, the 3rd block, the 4th block, the 5th block, the 6th block and District 7 block, centered on the 4th block, soil outlet is arranged on
4th block, the block at left and right sides of the 4th block is symmetrical, first step construction District 7 block, and second step is constructed the first block, the
Three steps the second block of construction and the 6th block, the 4th step the 3rd block of construction and the 5th block, the 5th step the 4th block of construction, dig
The soil gone out moves back digging from soil outlet；
302）The installation of support：After cutting the earth in the first stage, bracing members are set in the surrounding of special-shaped deep basal pit, and in opposite sides
Bracing members between connected by steel skeleton, while close to subway tunnel one end set 50m wide control zone, steel skeleton bottom
Special-shaped deep basal pit is set to the form of two layers of basement and support equipped with bracing members column, support order uses first support stress big
Supporting beam, then the supporting beam for supporting stress small；
303）Second stage is excavated：It cuts the earth to supporting beam bottom, according to step 301）Operation cut the earth to second stage；
304）Phase III excavates：It cuts the earth to plate bottom, according to step 301）Operation cut the earth to the phase III；
305）Fourth stage is excavated：It manually cuts the earth to plate bottom, according to step 301）Operation cut the earth to fourth stage；
4）Supporting removal：Dismounting order is identical with support order, and the control zone of 50m wide is torn open using rope saw cut dismounting method
It removes.
The special-shaped construction method of deep foundation ditch of a kind of adjacent subway tunnel, it is characterised in that the first stage is from nature
Ground to -2.5m, second stage is -2.5m to -4.9m, the phase III is -4.9m to -10.45m, fourth stage is -10.45m
To -10.75m.
A kind of special-shaped construction method of deep foundation ditch of adjacent subway tunnel, it is characterised in that step 301）In first
Stage cutting depth is 2.0m, and the soil body is plain fill and sandy silt in excavation, and when excavation controls slight slope height difference and the gradient, becomes silted up
Shale soil keeps 1：3.0 slope, remaining soil layer is with 1：1.5 slope.
A kind of special-shaped construction method of deep foundation ditch of adjacent subway tunnel, it is characterised in that step 303）In second
Stage cutting depth is 2.4, divides two layers to excavate, and the soil body is all sandy silt in layer excavation, and every layer of cutting depth is 1.2m, is controlled
Slight slope height difference and the gradient during earth excavation processed, muck soil keep 1：3.0 slope, remaining soil layer then 1：1.5 slope.
A kind of special-shaped construction method of deep foundation ditch of adjacent subway tunnel, it is characterised in that step 304）In the 3rd
Stage cutting depth is 5.55m, point three layers of excavation, and the soil body is sandy silt in layer excavation, and every layer of cutting depth is 1.85m,
The slight slope height difference and the gradient during earth excavation are controlled, muck soil keeps 1：3.0 slope, remaining soil layer then 1：1.5 slope；
Step 305）In the fourth stage hole local depths cubic metre of earth such as bottom more than 30cm and ground beam cushion cap preferably use hand excavation.
The special-shaped construction method of deep foundation ditch of a kind of adjacent subway tunnel, it is characterised in that close to subway on the outside of foundation pit
Side sets Impermeable underground wall curtain, and Impermeable underground wall curtain includes three axis cement mixing piles of one group of closing, and will be without outside foundation pit
Precipitation, is reserved with controlling dewatering well between two rows of three axis cement mixing piles, and stake bottom enters 3-1 very soft sill clays 2m, and three
Gutter is equipped with above axis cement mixing pile, gutter is connected with controlling dewatering well, and gutter is equipped with foundation pit outer side edges edge
Bar-mat reinforcement, and side slope protection is carried out using gunite concrete.
The special-shaped construction method of deep foundation ditch of a kind of adjacent subway tunnel, it is characterised in that soil outlet position is equipped with stack
Bridge structure, trestle work structure include 4 cast-in-situ bored piles, support frame and trestle, and 4 cast-in-situ bored piles are distributed in two rows of, and position
In the outside of three axis cement mixing piles；Cast-in-situ bored pile, the stake top of three axis cement mixing piles connect and compose stake by concreting
Top layer, trestle both ends are separately fixed at the top of support frame between stake top layer outside, the drill-pouring in support frame and outside
It is fixedly connected between stake by supporting beam.
The special-shaped construction method of deep foundation ditch of a kind of adjacent subway tunnel, it is characterised in that tried before earth excavation
It excavates：More than supporting beam carry out runin digging using 15m × 10m as region, 15m × 10m below supporting beam for a region into
Row runin is dug, and water-stop curtain ne-leakage is observed in runin after digging and subway tunnel horizontal displacement is less than 5mm, is further continued for carrying out subregion
Stage excavation.
A kind of special-shaped construction method of deep foundation ditch of adjacent subway tunnel, it is characterised in that the construction stream for saw cut of restricting
Journey is as follows：Preparation of construction, construction guard fender and security identifier are set, support scaffolding is set up, line positions, determines cutting section position
It puts, fixed guide, fixed rope saw, installation diamond rope chain saw, connection relevant operation system, concrete pad cutting, concrete is installed
Block lifting transports building site and place cleaning, support removing；When cutting the position of Guan Liang and supporting beam, cutting is sawed apart from every section of rope
Distance controlling perforate in 8-10m.
By using above-mentioned technology, compared with prior art, beneficial effects of the present invention are as follows：
1）The present invention constructs to the deep basal pit of adjacent subway tunnel by using the above method, in entire work progress,
The horizontal displacement displacement of monitoring subway tunnel, sedimentation deformation amount and convergence displacement in real time, subway tunnel horizontal displacement ＜
± 3mm, subway tunnel sedimentation deformation amount ＜ ± 5mm, subway tunnel convergence displacement ＜ ± 5mm, draw adjacent subway tunnel position
The non-hypervisor value rate of shifting amount is 95%, beyond predetermined 90% non-hypervisor announcement rate, substantially increases construction quality；
2）The present invention is by using the method for the restriction, and in entire Deep foundation Pit excavation, Subway Tunnel Displacement amount is not only controlled
System is in alarming value and displacement has obtained effective reduction, it is ensured that construction speed can press time limit for contract and complete, and this hair
Although bright add trestle work structure and water-stop curtain, it is 250,000 to increase trestle expense, and it is 1,200,000 to increase water-stop curtain expense newly,
Other auxiliary expenses 20,000, and the tunnel duct piece that the present invention influences amounts to 265 rings, surpasses by previous engineering statistics Subway Tunnel Displacement
The risk factor of alarming value is 5%, and subway tunnel shield section of jurisdiction renewal expense is about 200,000/ring, then the economic benefit generated is：
265×20×0.05 -（120+25+2）=118 ten thousand yuan, maintenance frequency is greatly reduced, adds economic benefit；
3）The present invention makes to have obtained effective control to adjacent subway tunnel displacement in deep foundation pit construction, really by above-mentioned technology
The safety of subway tunnel is protected.
Description of the drawings
Fig. 1 is the structure diagram of the special-shaped deep basal pit of the present invention；
Fig. 2 is the Impermeable underground wall curtain structure diagram of the present invention；
Fig. 3 is the structure diagram of the trestle work structure of the present invention.
In figure：The first blocks of A-, the second blocks of B-, the 3rd blocks of C-, the 4th blocks of D-, the 5th blocks of E-, the 6th areas of F-
Block, G- District 7 blocks, 1- soil outlets, 2- steel skeletons, 3- control zones, 4- bracing members, tri- axis cement mixing piles of 5-, 6- gutters,
7- bar-mat reinforcements, 8- supporting beams, 9- cast-in-situ bored piles, 10- stake top layers, 11- support frames, 12- trestles.
Specific embodiment
Below in conjunction with Figure of description, the invention will be further described, but protection scope of the present invention is not limited in
This：
As shown in Figs. 1-3, the special-shaped construction method of deep foundation ditch of a kind of adjacent subway tunnel of the invention, the deep base of abnormity of the invention
Structure is cheated as shown in Figure 1, its construction method includes the following steps：Preparation of construction, construction deployment, the installation of support, foundation pit plane
It excavates, the dismounting that foundation pit vertically excavates, foundation pit periphery is protected and supported, specifically comprises the following steps：
1）Preparation of construction：Excavator, muck haulage truck, wherein 2, PC300 types excavator, 8, PC200 types excavator, PC100 are dug
Native 2, machine, 2, PC60 excavators, the truck 50 of muck haulage 20t, PC300 types digging machine and PC200 types digging machine are large area soil
The machinery just excavated, PC100 type digging machines are responsible for the earth excavation of part inner corner trim, fringe region, and PC60 type digging machines are responsible for part slope
Road and the adjacent finishing for excavating interregional height difference side slope；
2）Construction deployment：Before construction, first supporting is cut the earth again, and supporting or support strength reach design requirement, then carries out layering point
Section is excavated；
3）Foundation pit plane is excavated：It is excavated using blockette, stratified form, vertically point 4 staged constructions, are laterally divided into 7 blocks
Construction, i.e., each stage are divided into 7 blocks：
301）First stage：It cuts the earth to Guan Liang bottom（From natural ground to -2.5m）, cutting depth 2.0m, the soil body is in excavation
Plain fill and sandy silt, slight slope height difference and the gradient are controlled during excavation, and muck soil keeps 1：3.0 slope, remaining soil layer
With 1：1.5 slope；The first block A, the second block B, the 3rd block C, the will be from left to right divided between soil and Guan Liang bottom naturally
Four block D, the 5th block E, the 6th block F and District 7 block G, centered on the 4th block D, soil outlet 1 is arranged on the 4th block
Block at left and right sides of D, the 4th block D is symmetrical, first step construction District 7 block G, second step the first block A of construction, the 3rd step
Construct the second block B and the 6th block F, the 4th step construction the 3rd block C and the 5th block E, the 5th step the 4th block D of construction,
The soil dug out moves back digging, slope retaining part from soil outlet 1, and cooperation excavation and construction process successively carries out；
302）The installation of support：After cutting the earth in the first stage, bracing members 4 are set in the surrounding of special-shaped deep basal pit, and opposite two
It is connected between the bracing members 4 of side by steel skeleton 2, while in the control zone 3 that 50m wide is set close to subway tunnel one end, reinforcing bar
2 bottom of frame is equipped with the form that special-shaped deep basal pit is set to two layers of basement and support by bracing members column, and support order, which uses, first to be supported
The big supporting beam of stress, then the supporting beam for supporting stress small；
303）Second stage is excavated：It cuts the earth to supporting beam bottom（- 2.5m to -4.9m）, second stage cutting depth is 2.4, divides two
Layer excavates, and the soil body is all sandy silt in layer excavation, and every layer of cutting depth is 1.2m, controls slight slope height difference during earth excavation
And the gradient, muck soil keep 1：3.0 slope, remaining soil layer then 1：1.5 slope；According to the operation of step 301 to second
Stage cuts the earth；
304）Phase III excavates：It cuts the earth to plate bottom（- 4.9m to -10.45m）, according to step 301 operation to the phase III into
Row is cut the earth, cutting depth 5.55m, point three layers of excavation, and the soil body is sandy silt in layer excavation, and every layer of cutting depth is
1.85m, controls slight slope height difference and the gradient during earth excavation, and muck soil keeps 1：3.0 slope, remaining soil layer then 1：
1.5 slope；The stage earth excavation should totally follow the principle of " stage excavation is forbidden to backbreak " and " big foundation pit, small to excavate ",
It cuts the earth and answers earth excavation that should combine the arrangement piecemeal of post-cast strip, symmetrically layering, progress, shoveling length is suitable with 20m, and lift height is not
More than 2.0m, muck soil excavation in layers thickness is not more than 1m, and digging machine should carry out manual amendment, the side after finishing at once after cutting the earth
Slope must be smooth and reaches design grade requirement, forbids once to excavate too deep, in pit earthwork digging process, forbids excavator
Tool collision support, column and fender post.
305）Fourth stage is excavated：It manually cuts the earth to plate bottom（- 10.45m to -10.75m）, since difficult local uses machine
Device excavates, therefore the present invention is cheating the local depths cubic metre of earth such as bottom more than 30cm and ground beam cushion cap using hand excavation, according to step
301 operation cuts the earth to fourth stage, and cheat side slope in foundation pit enclosure design hole carries out side slope protection using gunite concrete.
In phase III, fourth stage earth excavation, hole in hole is set to press 1:0.4 slope, slope surface spray 50 thickness C20 coagulations
It excavates, is carried out after plate part of integrally going to the bottom is excavated completely, first with 6.5 250 × 250 bar-mat reinforcements of φ, this regional earthwork in native
2 ~ 3 layers are excavated using Miniature digging machine, is 1.2m per layer height, the hole last 30cm soil bodys in bottom are using manually digging out；
The present invention sets temporary guard rail in excavation pit surrounding steel pipe, paints yellow black alternate paint, and ties up Dense mesh screen, to prevent
Personnel and object fall.Foundation pit sets up special steel pipe cat ladder to construction personnel up and down, and the horizontal distance that cat ladder is set should be less than 30m,
And it must not be less than at 2；
Excavation pit（Slot）During with cushion cap, side slope gray line is released, estimates absolute altitude, axis can be carried out after review inspection is errorless
If necessary using manually cutting the earth, clear slope is cut to foundation pit side wall for excavation and construction, and substrate soil is excavated and cleared up, to ensure substrate soil
Structure be not damaged；When slope pile crown exposure is longer, it is necessary to which timely chipping pile crown makes pile body inclining to prevent earthwork extruding, breaks
It splits；
In order to improve working security, the present invention carries out runin digging before earth excavation：More than supporting beam using 15m × 10m as one
A region carries out runin digging, and 15m × 10m carries out runin digging for a region below supporting beam, and runin observes water-stop curtain after digging
Ne-leakage and subway tunnel horizontal displacement are less than 5mm, are further continued for carrying out Sub-region and hierarchical excavation.
4）Supporting removal：Dismounting order is identical with support order, and rope saw cut dismounting method is used to the control zone 3 of 50m wide
It is removed；
The construction process of rope saw cut is as follows：Preparation of construction, construction guard fender and security identifier are set, support scaffolding is set up, are drawn
Line positioning determines cutting section position, installation fixed guide, fixed rope saw, installation diamond rope chain saw, connection relevant operation system
System, concrete pad cutting, the lifting of concrete block transport building site and place cleaning, support removing；In the position of cutting Guan Liang and supporting beam
Cutting perforates distance controlling in 8-10m apart from every section of rope saw when putting；Specially：.
401）The debugging of construction equipment and the admission safety education of personnel are carried out first, implement power supply, water source needed for construction
And storehouse and personnel handle official business, lodging condition.All round victory scaffold is set up at beam bottom, tube top and pin flitch pad；
402）Two meters are being removed on the outside of scope, is being isolated with Amber Alerts band；
403）Cutting machine is installed in the position that installation has supported, then guide rail and diamond cut rope are installed；
404）Confirm according to construction drawing field lofting, and through owner and management.Cutting route is planned to：For concrete support
Beam, using 4m ~ 5m square as a cutter unit, thickness is about 0.7m.Foundation mentioned above principle, in actual cut coverage, sequentially
Mark cutting route；
405）Go along with sb. to guard him beam support
The setting of framed bent：Framed bent releases 10CM per side along supporting beam width, and longitudinal upright bar spacing 80CM, four sides and centre are every
One of bridging should be set every four row's framed bent upright bars, set together every four row's framed bent upright bars, set by bottom to top is continuous, it is intermediate each
Clear distance between road bridging should not exceed 10m；
406）The operation of diamond rope saw is carried out by special messenger, and rope saw should have 5% angle when supporting beam is cut, and cut supporting beam
Into " eight " font after complete, supporting beam is made to be stuck in both ends and is not easy to drop, be also convenient for the lifting of concrete block, the concrete block cut is hung to crane
Shipped off-site on flat car, its angle of bridging is between 45~60 degree, and brace is except the intersecting therewith horizontal stroke of both ends rotary buckle
On the external part of horizon bar or upright bar, 2 ~ 4 should be increased therebetween and buckled a little.
Impermeable underground wall curtain is set close to subway side on the outside of the foundation pit of the present invention, as shown in Fig. 2, Impermeable underground wall curtain includes
Three axis cement mixing piles 5 of one group of closing and gutter 6, and outside foundation pit will without precipitation, two rows of three axis cement mixing piles 5 it
Between be reserved with controlling dewatering well, stake bottom enters 3-1 very soft sill clays 2m, and three axis cement mixing piles, 5 top is equipped with draining
Ditch 6, gutter 6 are connected with controlling dewatering well, and gutter is equipped with bar-mat reinforcement 7 with foundation pit outer side edges edge, and using injection coagulation
Soil carries out side slope protection.
As shown in figure 3,1 position of soil outlet is equipped with trestle work structure, trestle work structure includes 4 cast-in-situ bored piles 9, support frames
11 and 12,4 cast-in-situ bored piles 9 of trestle be distributed in two rows of, and positioned at the outside of three axis cement mixing piles 5；Cast-in-situ bored pile 9,
The stake top of three axis cement mixing piles 5 connects and composes stake top layer 10 by concreting, and 12 both ends of trestle are separately fixed at support rib
Between 10 outside of 11 top of frame and stake top layer, fixed and connected by supporting beam 8 between the cast-in-situ bored pile 9 in support frame 11 and outside
It connects.
Claims (10)
1. the special-shaped construction method of deep foundation ditch of a kind of adjacent subway tunnel, it is characterised in that include the following steps：Preparation of construction is applied
Administration of the Ministry of worker, the installation of support, foundation pit plane is excavated, foundation pit vertically excavates, foundation pit periphery is protected and the dismounting of support.
2. the special-shaped construction method of deep foundation ditch of a kind of adjacent subway tunnel according to claim 1, it is characterised in that specific
Include the following steps：
1）Preparation of construction：Excavator, muck haulage truck, wherein 2, PC300 types excavator, 8, PC200 types excavator, PC100 are dug
Native 2, machine, 2, PC60 excavators, the truck 50 of muck haulage 20t, PC300 types digging machine and PC200 types digging machine are large area soil
The machinery just excavated, PC100 type digging machines are responsible for the earth excavation of part inner corner trim, fringe region, and PC60 type digging machines are responsible for part slope
Road and the adjacent finishing for excavating interregional height difference side slope；
2）Construction deployment：Before construction, first supporting is cut the earth again, and supporting or support strength reach design requirement, then carries out layering point
Section is excavated；
3）Foundation pit plane is excavated：It is excavated using blockette, stratified form, vertically point 4 staged constructions, are laterally divided into 7 blocks
Construction, i.e., each stage are divided into 7 blocks：
301）First stage：It cuts the earth to Guan Liang bottom, from left to right will be divided into the first block between soil and Guan Liang bottom naturally（A）,
Two blocks（B）, the 3rd block（C）, the 4th block（D）, the 5th block（E）, the 6th block（F）And District 7 block（G）, the 4th area
Block（D）Centered on, soil outlet（1）It is arranged on the 4th block（D）, the 4th block（D）The block of the left and right sides is symmetrical, and the first step is applied
Work District 7 block（G）, second step the first block of construction（A）, the 3rd step the second block of construction（B）And the 6th block（F）, the 4th step
It constructs the 3rd block（C）With the 5th block（E）, the 5th step the 4th block of construction（D）, that digs out is native from soil outlet（1）Move back digging；
302）The installation of support：After cutting the earth in the first stage, bracing members are set in the surrounding of special-shaped deep basal pit（4）, and opposite
The bracing members of both sides（4）Between pass through steel skeleton（2）Connection, while in the control zone that 50m wide is set close to subway tunnel one end
（3）, steel skeleton（2）Bottom is equipped with the form that special-shaped deep basal pit is set to two layers of basement and support by bracing members column, support order
Using the supporting beam for first supporting stress big, then the supporting beam for supporting stress small；
303）Second stage is excavated：It cuts the earth to supporting beam bottom, according to step 301）Operation cut the earth to second stage；
304）Phase III excavates：It cuts the earth to plate bottom, according to step 301）Operation cut the earth to the phase III；
305）Fourth stage is excavated：It manually cuts the earth to plate bottom, according to step 301）Operation cut the earth to fourth stage；
4）Supporting removal：Dismounting order is identical with support order, to the control zone of 50m wide（3）Using rope saw cut dismounting method into
Row is removed.
3. the special-shaped construction method of deep foundation ditch of a kind of adjacent subway tunnel according to claim 2, it is characterised in that first
Stage be from natural ground to -2.5m, second stage be -2.5m to -4.9m, the phase III is -4.9m to -10.45m, the 4th
Stage is -10.45m to -10.75m.
A kind of 4. special-shaped construction method of deep foundation ditch of adjacent subway tunnel according to claim 2, it is characterised in that step
301）In first stage cutting depth for 2.0m, the soil body is plain fill and sandy silt in excavation, and when excavation controls slight slope high
Difference and the gradient, muck soil keep 1：3.0 slope, remaining soil layer is with 1：1.5 slope.
A kind of 5. special-shaped construction method of deep foundation ditch of adjacent subway tunnel according to claim 2, it is characterised in that step
303）In second stage cutting depth for 2.4, point two layers of excavation, the layer excavate in the soil body be all sandy silt, every layer of excavation
Depth is 1.2m, controls slight slope height difference and the gradient during earth excavation, and muck soil keeps 1：3.0 slope, remaining soil layer
Then 1：1.5 slope.
A kind of 6. special-shaped construction method of deep foundation ditch of adjacent subway tunnel according to claim 2, it is characterised in that step
304）In phase III cutting depth for 5.55m, point three layers of excavation, the layer excavate in the soil body be sandy silt, every layer of excavation
Depth is 1.85m, controls slight slope height difference and the gradient during earth excavation, and muck soil keeps 1：3.0 slope, remaining soil layer
Then 1：1.5 slope；Step 305）In the fourth stage hole local depths cubic metre of earth such as bottom more than 30cm and ground beam cushion cap preferably use people
Work is excavated.
A kind of 7. special-shaped construction method of deep foundation ditch of adjacent subway tunnel according to claim 2, it is characterised in that foundation pit
Outside sets Impermeable underground wall curtain close to subway side, and Impermeable underground wall curtain includes three axis cement mixing piles of one group of closing（5）, and
Will be without precipitation outside foundation pit, two rows of three axis cement mixing piles（5）Between be reserved with controlling dewatering well, stake bottom enters 3-1 silts
Shale silty clay 2m, three axis cement mixing piles（5）Top is equipped with gutter（6）, gutter（6）Connect with controlling dewatering well
It connects, gutter is with foundation pit outer side edges along equipped with bar-mat reinforcement（7）, and side slope protection is carried out using gunite concrete.
8. the special-shaped construction method of deep foundation ditch of a kind of adjacent subway tunnel according to claim 7, it is characterised in that be unearthed
Mouthful（1）Position is equipped with trestle work structure, and trestle work structure includes 4 cast-in-situ bored piles（9）, support frame（11）And trestle（12）, 4
Cast-in-situ bored pile（9）It is distributed in two rows, and positioned at three axis cement mixing piles（5）Outside；Cast-in-situ bored pile（9）, three axis cement
Mixing pile（5）Stake top stake top layer is connected and composed by concreting（10）, trestle（12）Both ends are separately fixed at support frame
（11）Top and stake top layer（10）Between outside, support frame（11）With the cast-in-situ bored pile in outside（9）Between pass through supporting beam
（8）It is fixedly connected.
A kind of 9. special-shaped construction method of deep foundation ditch of adjacent subway tunnel according to claim 2, it is characterised in that the earthwork
Runin digging is carried out before excavating：More than supporting beam using 15m × 10m as a region progress runin digging, 15m × 10m below supporting beam
Runin digging is carried out for a region, water-stop curtain ne-leakage is observed in runin after digging and subway tunnel horizontal displacement is less than 5mm, then
Continue Sub-region and hierarchical excavation.
A kind of 10. special-shaped construction method of deep foundation ditch of adjacent subway tunnel according to claim 2, it is characterised in that rope saw
The construction process of cutting is as follows：Preparation of construction, construction guard fender and security identifier are set, support scaffolding is set up, line positions, really
Determine cutting section position, installation fixed guide, fixed rope saw, installation diamond rope chain saw, connection relevant operation system, concrete
Cushion block cutting, the lifting of concrete block transport building site and place cleaning, support removing；When cutting the position of Guan Liang and supporting beam cutting away from
From every section rope saw perforation distance controlling is in 8-10m.
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| CN109653212A (en) * | 2019-01-31 | 2019-04-19 | 长江勘测规划设计研究有限责任公司 | Close on the irregular deep basal pit group comprehensive support structure and construction method of high-speed railway |
| CN110453688A (en) * | 2019-08-19 | 2019-11-15 | 中铁十二局集团有限公司 | The excavation method of foundation pit |
| CN112883455A (en) * | 2020-12-31 | 2021-06-01 | 浙江华东测绘与工程安全技术有限公司 | Safety analysis method for steel support of subway deep foundation pit |
| CN113293766A (en) * | 2021-03-30 | 2021-08-24 | 内蒙古科技大学 | Comprehensive earthwork excavation method for large-scale cover excavation top-down T-shaped transfer subway station |
| CN113653062A (en) * | 2021-08-16 | 2021-11-16 | 中国建筑第八工程局有限公司 | Construction method for quickly unearthing deep foundation pit by utilizing trestle to combine with road in pit |
| CN114308976A (en) * | 2021-12-09 | 2022-04-12 | 中建三局集团有限公司 | Special-shaped foundation pit dustproof canopy and installation and use method thereof |
| CN116815790A (en) * | 2023-08-28 | 2023-09-29 | 上海建工一建集团有限公司 | Foundation pit supporting servo system with two sides adjacent to protection objects and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653212A (en) * | 2019-01-31 | 2019-04-19 | 长江勘测规划设计研究有限责任公司 | Close on the irregular deep basal pit group comprehensive support structure and construction method of high-speed railway |
| CN110453688A (en) * | 2019-08-19 | 2019-11-15 | 中铁十二局集团有限公司 | The excavation method of foundation pit |
| CN112883455A (en) * | 2020-12-31 | 2021-06-01 | 浙江华东测绘与工程安全技术有限公司 | Safety analysis method for steel support of subway deep foundation pit |
| CN113293766A (en) * | 2021-03-30 | 2021-08-24 | 内蒙古科技大学 | Comprehensive earthwork excavation method for large-scale cover excavation top-down T-shaped transfer subway station |
| CN113293766B (en) * | 2021-03-30 | 2022-12-30 | 内蒙古科技大学 | Comprehensive earth excavation method for large-scale cover-excavation top-down T-shaped transfer subway station |
| CN113653062A (en) * | 2021-08-16 | 2021-11-16 | 中国建筑第八工程局有限公司 | Construction method for quickly unearthing deep foundation pit by utilizing trestle to combine with road in pit |
| CN114308976A (en) * | 2021-12-09 | 2022-04-12 | 中建三局集团有限公司 | Special-shaped foundation pit dustproof canopy and installation and use method thereof |
| CN116815790A (en) * | 2023-08-28 | 2023-09-29 | 上海建工一建集团有限公司 | Foundation pit supporting servo system with two sides adjacent to protection objects and construction method thereof |
| CN116815790B (en) * | 2023-08-28 | 2023-11-17 | 上海建工一建集团有限公司 | Construction method of foundation pit supporting servo system with two sides adjacent to protection object |
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