CN106567717B - It is a kind of to double as construction access ramp structure and construction method using subway entrance - Google Patents
It is a kind of to double as construction access ramp structure and construction method using subway entrance Download PDFInfo
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- CN106567717B CN106567717B CN201510649961.XA CN201510649961A CN106567717B CN 106567717 B CN106567717 B CN 106567717B CN 201510649961 A CN201510649961 A CN 201510649961A CN 106567717 B CN106567717 B CN 106567717B
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Abstract
The invention belongs to urban track traffic technique of design and construction fields, more particularly to a kind of utilization subway entrance is as construction access ramp structure and construction method, it is characterized in that, high section composition construction access ramp structure is chosen including open cut open-mouth section, tunneling slope section, people's air defense flat segments and entering the station, access ramp of constructing utilizes subway port structure, using Tunnel structure as construction access ramp bearing structure, construction in later period secondary lining forms the port structure of subway station；Construction procedure are as follows: (1) excavate access ramp open excavation section；(2) it carries out tunneling slope section, people's air defense flat segments and enters the station to choose the tunneling just branch construction of high section；(3) port structure is excavated downwards；(4) mould builds the lining of tunneling section entrance two；(5) backfill and mould build open excavation section port structure；(6) internal structure is applied.The present invention can reduce under the complex environment of city construction and enter the station the risk in channel, guarantee that soil layer and rock stratum big cross section tunneling subway station enter the station construction safety.
Description
Technical field
The invention belongs to Design of Urban Rail Transit Engineering and technical field of construction, more particularly to one kind is in tunneling subway
Stand construction when, in conjunction with the entrance setting construction access ramp structure and corresponding construction method of subway station.
Background technique
Subway station is the important component of urban rail transit construction, since its construction scale is big, investment is high, difficulty of construction
The big and time is longer, especially with the subway station of shallow mining method, typically the node control engineering of all fronts.Shallow buried covered excavation
Method is favored since it does not influence traffic, do not change shifting pipeline and influences minimum to surrounding enviroment in down town city.
With the development of urban rail transit construction, the surrounding enviroment at the position of subway station become increasingly complex, and people protect environment at this stage
Shield is also increasingly paid attention to, and shallow mining method subway station often becomes preferential selection.
Since subway station section is bigger, subsurface excavation method is typically all the method for using partial excavation, and the section that becomes larger is small
Section, it is step by step cyclic.Common Dryopteris sublaetaChing et Hsu method has middle hole method, side hole method and cavern-pile method etc..No matter being applied using which kind of
Work method, will be arranged the construction channel into Station first, and the construction of entering the station of tunneling at present is all using setting 2~3
The method of construction shaft and construction transverse passage-way.Construction shaft generally utilizes the ventilating shaft at station both ends, and construction channel utilizes station
Construction of entering the station is organized in air duct.
Come with some shortcomings using the enter the station method of construction of the conventional tissue using ventilating shaft air duct, be construction efficiency first compared with
It is low, especially in lithostratigraphy.Construction shaft is set using ventilating shaft, muck removal and transport of materials require vertical-lift, are arranged
Gantry crane or electric block.Meanwhile if station tunnel is in rocky stratum, the intensity of rock mass is much larger than the soil body, tunnel
It also needs to take blasting construction method in road excavation construction, the cubic meter of stone after explosion transports more notable influence speed of application.Followed by
Construction safety risk is larger, and the general area of ventilating shaft is big, and depth is generally required more than 20m or more when for construction shaft, belongs to depth
Foundation pit；While the height for transverse passage-way of constructing is also required to excavate in 16m or so and construction risk is big.That investment is high again, due to by
The efficiency of construction shaft and transverse passage-way influences, and a Station generally all needs setting 2 or 3 construction shafts while organizing
Construction, just can guarantee construction speed；The lifting system of vertical shaft setting is also a no small spending.It is finally to be applied using subsurface excavation method
The surrounding enviroment at work station are generally all more complicated, are sometimes difficult to choose 2~3 suitable construction sites and come organizing construction,
Often construction site, which cannot implement just, influences entire project progress.
As can be seen from the above analysis, traditional Station is entered the station construction using construction shaft and construction transverse passage-way tissue
Mode, there are construction efficiency is low and the distinct disadvantage that takes up a large area.In conjunction with Shallow Covered Metro Station constructing tunnel mechanics
Feature and construction organization mode require, and to improve construction efficiency comprehensively, reduce construction risk and occupied ground, propose a kind of utilization
Subway entrance using open cut open-mouth section, tunneling slope section, people's air defense flat segments and enters the station as construction access ramp structure and chooses high section
Segmentation composition realizes the construction of quickly entering the station of soil property or lithostratigraphy shallow buried covered excavation big cross section metro station tunnel.
Summary of the invention
The purpose of the present invention is overcome above-mentioned traditional Shallow Covered Metro Station to enter the station construction shaft and transverse passage-way organizer
Deficiency present in formula, it is ensured that soil layer and rocky stratum big cross section metro station tunnel enter the station the safety of construction, provide a kind of benefit
With subway entrance as construction access ramp structure and the construction method to enter the station, which has structure type and engineering method technique letter
Single, into horizontal transport, haulage vehicle can be directly entered station main body construction, convenient and quick construction for change vertical-lift, and raising is applied
Work efficiency rate, and channel of constructing is arranged in conjunction with entrance, and a construction access ramp is arranged and had both been able to satisfy station construction requirement, reduction is applied
Work land occupation, saves project cost.
The technical scheme adopted by the invention is as follows:
It is a kind of to double as construction access ramp structure using subway entrance, which is characterized in that oblique including open cut open-mouth section, tunneling
It slope section, people's air defense flat segments and enters the station and chooses high section, the open cut open-mouth section, tunneling slope section, people's air defense flat segments and enter the station and choose high section
It is sequentially connected logical formation construction access ramp structure.
The construction access ramp utilizes subway port structure, and construction period is using Tunnel structure as construction
Access ramp bearing structure, construction in later period secondary lining form the port structure of subway station；The clear span of construction access ramp uses
Two lining structure width of port structure, the clear span >=4.5m for access ramp of constructing；The clear height of construction access ramp uses entrance knot
Two lining structure height of structure, the clear height >=5.0m for access ramp of constructing.
The open cut open-mouth section includes concrete shield top, foundation pit side-wall supporting, base plate of foundation pit bed course, plate brad supporting, open cut
Backfill layer, bed course and open cut waterproof layer, entrance concrete structure, the foundation pit side-wall supporting are set to base plate of foundation pit bed course
Top two sides, concrete shield top are set to the top of the foundation pit side-wall supporting, and the plate brad supporting is fixed on foundation pit side
The outside of wall supporting, open cut backfill layer are filled between the foundation pit side-wall supporting of two sides and base plate of foundation pit bed course, it is described go out
Entrance concrete structure is located between the foundation pit side-wall supporting of two sides and its top for being located at open cut backfill layer, the entrance
Concrete structure forms open cut exit and entrance, and the bed course and open cut waterproof layer are set to open cut backfill layer, entrance coagulation
Between soil structure.
In the open cut open-mouth section, the open cut opening segment length is 25-35m, and the foundation pit side-wall supporting is by fashioned iron, soil
Nail, steel mesh and gunite concrete composition, the bed course is close to open cut backfill layer setting, and the open cut waterproof layer is close to entrance
Concrete structure setting.
At the beginning of the tunneling slope section includes tunneling advance support, construction channel preliminary bracing structure, later period excavation entrance
Branch structure, two lining structure of tunneling slope section, tunneling slope section fill concrete layer, the construction channel preliminary bracing structure setting
The top of branch structure, two lining structure of tunneling slope section are set to construction channel initial stage branch at the beginning of excavating entrance in the later period
Protection structure, later period excavate the inside of the first branch structure of entrance, offer tunneling slope section in two lining structure of tunneling slope section
Channel, the tunneling slope section fill concrete layer are filled in construction channel preliminary bracing structure, two lining structure of tunneling slope section
Top between, the tunneling advance support be set to it is described construction channel preliminary bracing structure tip exterior.
In the tunneling slope section, the gradient≤14% that the tunneling slope section longitudinally uses, the tunneling slope section two is served as a contrast
Structure and tunneling slope section fill concrete layer, construction channel preliminary bracing structure, later period excavate between the first branch structure of entrance
It is provided with the tunneling waterproof layer of perforation, the construction channel preliminary bracing structure is by grid steel frame, steel mesh and gunite concrete
Composition, two lining structure of tunneling slope section are reinforced concrete structure.
The people's air defense flat segments include people's air defense advance support, people's air defense preliminary bracing structure, two lining structure of people's air defense and gate stack knot
Structure, the people's air defense preliminary bracing structure setting is in the top outer of the people's air defense advance support, two lining structure of the people's air defense setting
Antiaircraft tunnel is offered in the inside of the inside of the people's air defense preliminary bracing structure, two lining structure of people's air defense.
It is described to enter the station that choose high section include entering the station and choosing high section advance support, enter the station and choose high section preliminary bracing structure, enter the station and choose height
Two lining structures of section enter the station and choose high section fill concrete layer, it is described enter the station to choose high section advance support and be set to enter the station choose high section initial stage
The top outer of supporting construction, it is described enter the station to choose high two lining structure of section and be set to described enter the station choose the interior of high section preliminary bracing structure
Portion, described enter the station choose the inside of high two lining structure of section and offer channel of entering the station, and described enter the station chooses high section fill concrete layer setting
High section preliminary bracing structure is chosen, between the top for choosing high two lining structure of section of entering the station in entering the station.
In the people's air defense flat segments, gate stack structure, the people's air defense are downwardly extending at the top of two lining structure of people's air defense
People's air defense waterproof layer is provided between two lining structures, people's air defense preliminary bracing structure；Described enter the station is chosen in high section, and described enter the station chooses high section
Two lining structures and enter the station choose high section fill concrete layer, entering the station to choose is provided with the waterproof layer that enters the station between high section preliminary bracing structure,
Described enter the station chooses the vault of high section preliminary bracing structure and is raised above station main body vault absolute altitude using the gradient gradual change of 1:3.
A kind of construction method doubling as construction access ramp structure using subway entrance, which is characterized in that according to following step
It is rapid to carry out:
(1) open cut open-mouth section foundation pit unwrapping wire positions, and excavates access ramp open cut open-mouth section；Foundation pit side-wall is handled when excavating,
It sets plate brad supporting and applies fashioned iron and gunite concrete structure, made when the weakness of stratum using cast-in-situ bored pile+inner support system
For foundation pit enclosure structure, base plate of foundation pit cushion layer structure is applied after being excavated to the low absolute altitude of foundation pit；
(2) the tunneling advance support that tunneling access ramp arch is set in foundation pit side-wall uses steel tube shed into hole advance support
Or grouting with small pipe；
(3) it carries out tunneling slope section, people's air defense flat segments and enters the station to choose the access ramp boring construction of high section, construction uses step
Method is excavated, setting interim inverted arch together in middle part when geological conditions is poor or monitoring needs, the first branch structure construction of entrance access ramp
Key step are as follows: advance support ductule or anchor pole and slip casting；It excavates, one Pin bracing members spacing of drilling depth；First pneumatically placed concrete hangs steel
Muscle net erects bracing members, gunite concrete；Preliminary bracing back-grouting；Carry out next step circulation；
(4) it enters the station after the completion of choosing high section preliminary bracing structure, carries out Station main structure construction；
(5) after the completion of the main structure construction of station, access ramp tunneling slope section bottom is abolished, is excavated to entrance bottom downwards
Plate absolute altitude performs entrance slope section bottom later period excavation entrance just branch structure；Then construction, which is entered the station, chooses that high section, people's air defense is straight
For section to two lining structure of tunneling slope section, mould builds armored concrete；
(6) backfill, which is entered the station, chooses gap above high section and tunneling slope section entrance section arch, and backfill uses C20 coagulation
Soil, while arch built-in slip casting pipe is served as a contrast in port structure two, two backing grouting behind shaft or drift lining are carried out, are filled after two backings of guarantee closely knit；
(7) entrance open cut open-mouth section is backfilled, open cut waterproof layer and bottom plate, side wall and top board structure are applied；Using plain soil
It backfills at the top of open cut rectangular cross section to ground elevation, applies entrance internal structure, so far form the ground as construction access ramp
Iron entrance.
The invention has the benefit that
1, a kind of utilization subway entrance of the invention overcomes conventionally employed as construction access ramp structure and construction method
The shortcomings that construction shaft vertical-lift low efficiency, change vertical-lift significantly improve construction efficiency into horizontal flexible transport；
2, structural support system is simple, in conjunction with port structure step-by-step arrangement construction access ramp, makes full use of existing structure,
Abandoned project amount very little；
3, relative to traditional construction shaft and construction transverse passage-way, using entrance as the structure section of construction access ramp
Small, excavation height is small, and construction risk is small；
4, structure occupied ground is few, does not directly increase construction site, while a construction access ramp newly using subway entrance
It is able to satisfy station construction demand, it is small on surrounding enviroment influence, it is convenient for construction organization and coordination；
5, engineering method simple process, easy to operate, combined using light and shade and slope choose high piecewise combination mode can be well real
Now enter the station function of constructing, and improves work efficiency, saves project cost.
Detailed description of the invention
Fig. 1 is structural plan arrangement schematic diagram of the invention；
Fig. 2 is structure vertical section arrangement schematic diagram of the invention；
Fig. 3 enters station main structure diagrammatic cross-section for of the invention；
Fig. 4 is open cut open-mouth section sectional schematic diagram of the invention；
Fig. 5 is tunneling slope section sectional schematic diagram of the invention；
Fig. 6 is people's air defense flat segments sectional schematic diagram of the invention；
Fig. 7 is that high section sectional schematic diagram is chosen in of the invention entering the station；
Fig. 8 is open cut open-mouth section supporting construction schematic diagram of the invention；
Fig. 9 is that construction access ramp preliminary bracing structure construction of the invention forms schematic diagram；
Figure 10 is entrance tunneling slope section secondary liner structure construction schematic diagram of the invention；
Figure 11 is entrance open cut open-mouth section of the invention and internal structure construction schematic diagram.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings:
In figure, 1- foundation pit side-wall supporting, 2- base plate of foundation pit bed course, 3- plate brad supporting, 4- concrete shield top, 5- open cut backfill
Layer, 6- open cut waterproof layer, 7- entrance concrete structure, 8- tunneling advance support, 9- construction channel preliminary bracing structure, 10-
Access ramp construction channel base plate, the 11- later period excavates entrance, and just branch structure, two lining structure of 12- tunneling slope section, 13- tunneling are oblique
Slope section fill concrete layer, 14- people's air defense advance support, 15- people's air defense preliminary bracing structure, two lining structure of 16- people's air defense, 17- enter the station
High section advance support is chosen, 18-, which enters the station, chooses high section preliminary bracing structure, and 19-, which enters the station, chooses high two lining structure of section, and 20-, which enters the station, chooses high section
Fill concrete layer, the station 21- main structure, 22- gate stack structure, 23- entrance internal structure, 24- tunneling slope section, 25-
People's air defense flat segments, 26-, which enters the station, chooses high section, 27- open cut exit and entrance, 28- tunneling slope section channel, 29- tunneling waterproof layer,
30- people's air defense waterproof layer, 31- antiaircraft tunnel, 32- enter the station channel, and 33- enters the station waterproof layer, 34- bed course, 35- open cut open-mouth section.
Embodiment 1
It is a kind of to double as construction access ramp structure, including open cut open-mouth section 35, tunneling slope section 24, people using subway entrance
It anti-flat segments 25 and enters the station and chooses high section 26, open cut open-mouth section 35, tunneling slope section 24, people's air defense flat segments 25 and enter the station and choose high section 26
It is sequentially connected logical formation construction access ramp structure.
Access ramp of constructing utilizes subway port structure, and construction period is tiltedly logical as construction using Tunnel structure
Road bearing structure, construction in later period secondary lining form the port structure of subway station；The clear span of construction access ramp is using discrepancy
Two lining structure width of mouth structure, the clear span for access ramp of constructing are 4.5m；The clear height of construction access ramp is using port structure
Two lining structure height, the clear height for access ramp of constructing are 5.0m.
Open cut open-mouth section 35 includes concrete shield top 4, foundation pit side-wall supporting 1, base plate of foundation pit bed course 2, plate brad supporting 3, bright
It digs backfill layer 5, bed course 34 and open cut waterproof layer 6, entrance concrete structure 7, foundation pit side-wall supporting 1 and is set to base plate of foundation pit pad
The top two sides of layer 2, concrete shield top 4 are set to the top of foundation pit side-wall supporting 1, and plate brad supporting 3 is fixed on foundation pit side-wall branch
The outside of shield 1, open cut backfill layer 5 are filled between the foundation pit side-wall supporting 1 of two sides and base plate of foundation pit bed course 2, entrance coagulation
Soil structure 7 is located between the foundation pit side-wall supporting 1 of two sides and its top for being located at open cut backfill layer 5, entrance concrete knot
Structure 7 forms open cut exit and entrance 27, and bed course 34 and open cut waterproof layer 6 are set to open cut backfill layer 5, entrance concrete structure
Between 7.
In open cut open-mouth section 35,35 length of open cut open-mouth section is 30m, and foundation pit side-wall supporting 1 is by fashioned iron, soil nailing, steel mesh
It is formed with gunite concrete, bed course 34 is arranged close to open cut backfill layer 5, and open cut waterproof layer 6 is set close to entrance concrete structure 7
It sets.
At the beginning of tunneling slope section 24 includes tunneling advance support 8, construction channel preliminary bracing structure 9, later period excavation entrance
Branch structure 11, two lining structure 12 of tunneling slope section, tunneling slope section fill concrete layer 13, channel preliminary bracing structure 9 of constructing
It is set to the top of the later period first branch structure 11 of excavation entrance, two lining structure 12 of tunneling slope section is set to construction channel initial stage branch
Protection structure 9, later period excavate the inside of the first branch structure 11 of entrance, offer tunneling slope section in two lining structure 12 of tunneling slope section
Channel 28, tunneling slope section fill concrete layer 13 are filled in construction channel preliminary bracing structure 9, two lining structure of tunneling slope section
Between 12 top, tunneling advance support 8 is set to the tip exterior of construction channel preliminary bracing structure 9.
In tunneling slope section 24, the gradient that tunneling slope section 24 longitudinally uses for 14%, two lining structure 12 of tunneling slope section with
Tunneling slope section fill concrete layer 13, construction channel preliminary bracing structure 9, later period excavate to be set between the first branch structure 11 of entrance
It is equipped with the tunneling waterproof layer 29 of perforation, channel preliminary bracing structure 9 of constructing is by grid steel frame, steel mesh and gunite concrete group
At two lining structure 12 of tunneling slope section is reinforced concrete structure.
People's air defense flat segments 25 are the people's air defense segment structure that subway entrance is fully utilized, including people's air defense advance support 14, people
Anti- preliminary bracing structure 15, two lining structure 16 of people's air defense and gate stack structure 22, it is advanced that people's air defense preliminary bracing structure 15 is set to people's air defense
The top outer of supporting 14, two lining structure 16 of people's air defense are set to the inside of people's air defense preliminary bracing structure 15, two lining structure 16 of people's air defense
Inside offer antiaircraft tunnel 31.
Entering the station, to choose high section 26 include entering the station and choosing high section advance support 17, enter the station and choose high section preliminary bracing structure 18, enter the station and choose
High two lining structure 19 of section enters the station and chooses high section fill concrete layer 20, enters the station to choose high section advance support 17 and be set to enter the station and chooses high section
The top outer of preliminary bracing structure 18 enters the station to choose high two lining structure 19 of section and be set to enter the station and chooses high section preliminary bracing structure 18
Inside enters the station and chooses the inside of high two lining structure 19 of section and offer channel 32 of entering the station, and enters the station and chooses high section fill concrete layer 20 and be arranged
High section preliminary bracing structure 18 is chosen, between the top for choosing high two lining structure 19 of section of entering the station in entering the station.
In people's air defense flat segments 25, the top of two lining structure 16 of people's air defense is downwardly extending gate stack structure 22, the lining knot of people's air defense two
People's air defense waterproof layer 30 is provided between structure 16, people's air defense preliminary bracing structure 15；It enters the station and chooses in high section 26, enter the station and choose the high lining of section two knot
Structure 19 and enter the station choose high section fill concrete layer 20, entering the station to choose is provided with the waterproof layer that enters the station between high section preliminary bracing structure 18
33, it enters the station and chooses the vault of high section preliminary bracing structure 18 main body 21 vault absolute altitude in station is raised above using the gradient gradual change of 1:3,
Convenient for the horse-head ingate that enters the station out.
Open cut exit and entrance 27, tunneling slope section channel 28, antiaircraft tunnel 31, channel 32 of entering the station are sequentially communicated.
The embodiment for being applied to metro station construction as construction access ramp structure using subway entrance of the invention, such as
It is provided by the invention to double as construction access ramp construction method including in order using subway entrance shown in Fig. 1-Figure 11
The following steps of progress:
(1) 35 foundation pit unwrapping wire of open cut open-mouth section positions, and excavates access ramp open cut open-mouth section 35；Foundation pit side is handled when excavating
Wall is arranged foundation pit side-wall supporting 1, sets plate brad supporting 3 and apply fashioned iron and gunite concrete structure, gunite concrete thickness
300mm；Using cast-in-situ bored pile+inner support system as foundation pit enclosure structure when the weakness of stratum；After being excavated to the low absolute altitude of foundation pit
2 structure of bottom cushion is applied, base plate of foundation pit bed course 2 uses 200 thickness C20 concrete；Foundation pit surrounding ground is arranged concrete and protects top 4
Reinforcing and water blocking；
(2) the tunneling advance support 8 that tunneling access ramp arch is set in foundation pit side-wall uses diameter into hole advance support
108mm steel tube shed and diameter 32mm grouting with small pipe, grouting serous fluid use cement single slurry；Then base within the scope of access ramp is abolished
Side wall is cheated, setting grid steel frame and foundation pit side-wall fashioned iron weld；
(3) it carries out tunneling slope section 24 to construct, be excavated using benching tunnelling method, one Pin bracing members spacing of drilling depth, first pneumatically placed concrete,
Steel mesh is hung, bracing members are erected, gunite concrete completes construction channel preliminary bracing structure 9 and access ramp construction channel base plate
10, slope section uses the 14% downward gradient；
(4) it carries out people's air defense flat segments 25 to construct, people's air defense advance support 14 of first constructing is reinforced using grouting with small pipe；Tunnel
It excavates and uses benching tunnelling method, one Pin bracing members spacing of drilling depth, first pneumatically placed concrete, extension steel mesh, erection bracing members, gunite concrete,
Complete oblique people's air defense preliminary bracing structure 15.
(5) after the completion of people's air defense flat segments 25, the high construction of section 26 is chosen into entering the station；Tunnel vault according to 1:3 the gradient gradually
Height is chosen, first construction, which is entered the station, chooses high section advance support 17, reinforces using grouting with small pipe；Tunnel excavation uses benching tunnelling method, drilling depth one
Pin bracing members spacing, first pneumatically placed concrete hang steel mesh, erect bracing members, and gunite concrete is completed tiltedly to enter the station and chooses high section initial stage branch
Protection structure 18 so far completes construction access ramp just branch structure construction；
(6) it enters the station after the completion of choosing high section preliminary bracing structure 18, carries out Station station main structure 21 and construct；
(7) after the completion of station main structure 21 is constructed, the access ramp construction channel base plate of access ramp tunneling slope section is abolished
10, it is excavated to entrance floor level downwards, performs entrance slope section bottom later period excavation entrance just branch structure 11；
(8) it after the completion of just 11 construction of branch structure of later period excavation entrance, falls back to construct to enter the station from station interface and chooses high section
Two lining structures 19, two lining structure 16 of people's air defense and gate stack structure 22, two lining structure 12 of tunneling slope section, using gang form scaffold
Mould builds armored concrete；
(9) it enters the station and chooses high section 26 and two lining side of tunneling slope section entrance there are gap, construction, which is entered the station, chooses high section backfill
Concrete layer 20 and tunneling slope section fill concrete layer 13, backfill uses C20 concrete, while serving as a contrast and encircleing in port structure two
Portion's built-in slip casting pipe carries out two backing grouting behind shaft or drift lining, fills after two backings of guarantee closely knit；
(10) after the completion of entrance tunneling open-mouth section 23 is constructed, construction open cut backfills layer 5, then applies the open cut above it
Section bed course 34 and open cut waterproof layer 6, then mould builds bottom plate, side wall and entrance concrete structure 7；Using plain earthen backfill open cut square
Shape profile head applies entrance internal structure 23, so far forms the subway entrance as construction access ramp to ground elevation.
Embodiment 2
A kind of to be doubled as in construction access ramp structure using subway entrance, the clear span for access ramp of constructing uses port structure
Two lining structure width, the clear span of access ramp of constructing is 5m；The clear height of construction access ramp uses two lining structures of port structure
Highly, construct access ramp clear height be 5.5m；In open cut open-mouth section 35,35 length of open cut open-mouth section is 26m；Tunneling slope section 24
In, the gradient that tunneling slope section 24 longitudinally uses is 12%；Rest part is the same as embodiment 1.
The embodiment for being applied to metro station construction as construction access ramp structure using subway entrance of the invention, such as
It is provided by the invention to double as construction access ramp construction method including in order using subway entrance shown in Fig. 1-Figure 11
The following steps of progress:
(1) 35 foundation pit unwrapping wire of open cut open-mouth section positions, and excavates access ramp open cut open-mouth section 35；Foundation pit side is handled when excavating
Wall is arranged foundation pit side-wall supporting 1, sets plate brad supporting 3 and apply fashioned iron and gunite concrete structure, gunite concrete thickness
310mm；Using cast-in-situ bored pile+inner support system as foundation pit enclosure structure when the weakness of stratum；After being excavated to the low absolute altitude of foundation pit
2 structure of bottom cushion is applied, base plate of foundation pit bed course 2 uses 200 thickness C20 concrete；Foundation pit surrounding ground is arranged concrete and protects top 4
Reinforcing and water blocking；
(2) the tunneling advance support 8 that tunneling access ramp arch is set in foundation pit side-wall uses diameter into hole advance support
110mm steel tube shed and diameter 30mm grouting with small pipe, grouting serous fluid use cement single slurry；Then base within the scope of access ramp is abolished
Side wall is cheated, setting grid steel frame and foundation pit side-wall fashioned iron weld；
(3) it carries out tunneling slope section 24 to construct, be excavated using benching tunnelling method, one Pin bracing members spacing of drilling depth, first pneumatically placed concrete,
Steel mesh is hung, bracing members are erected, gunite concrete completes construction channel preliminary bracing structure 9 and access ramp construction channel base plate
10, slope section uses the 12% downward gradient；
(4) it carries out people's air defense flat segments 25 to construct, people's air defense advance support 14 of first constructing is reinforced using bolt grouting；It opens in tunnel
It digs and uses benching tunnelling method, one Pin bracing members spacing of drilling depth, first pneumatically placed concrete hangs steel mesh, erects bracing members, and gunite concrete is complete
At oblique people's air defense preliminary bracing structure 15；
(5) after the completion of people's air defense flat segments 25, the high construction of section 26 is chosen into entering the station；Tunnel vault according to 1:3 the gradient gradually
Height is chosen, first construction, which is entered the station, chooses high section advance support 17, reinforces using bolt grouting；Tunnel excavation uses benching tunnelling method, one Pin of drilling depth
Bracing members spacing, first pneumatically placed concrete hang steel mesh, erect bracing members, and gunite concrete is completed tiltedly to enter the station and chooses high section preliminary bracing
Structure 18 so far completes construction access ramp just branch structure construction；
Step (6)-(10) are the same as embodiment 1.
Embodiment 3
A kind of to be doubled as in construction access ramp structure using subway entrance, the clear span for access ramp of constructing uses port structure
Two lining structure width, the clear span of access ramp of constructing is 5.5m；The clear height of construction access ramp is tied using two linings of port structure
Structure height, the clear height for access ramp of constructing are 5.5m；In open cut open-mouth section 35,35 length of open cut open-mouth section is 35m；Tunneling slope section
In 24, the gradient that tunneling slope section 24 longitudinally uses is 13%；Rest part is the same as embodiment 1.
The embodiment for being applied to metro station construction as construction access ramp structure using subway entrance of the invention, such as
It is provided by the invention to double as construction access ramp construction method including in order using subway entrance shown in Fig. 1-Figure 11
The following steps of progress:
(1) 35 foundation pit unwrapping wire of open cut open-mouth section positions, and excavates access ramp open cut open-mouth section 35；Foundation pit side is handled when excavating
Wall is arranged foundation pit side-wall supporting 1, sets plate brad supporting 3 and apply fashioned iron and gunite concrete structure, gunite concrete thickness
320mm；Using cast-in-situ bored pile+inner support system as foundation pit enclosure structure when the weakness of stratum；After being excavated to the low absolute altitude of foundation pit
2 structure of bottom cushion is applied, base plate of foundation pit bed course 2 uses 200 thickness C20 concrete；Foundation pit surrounding ground is arranged concrete and protects top 4
Reinforcing and water blocking；
(2) the tunneling advance support 8 that tunneling access ramp arch is set in foundation pit side-wall uses diameter into hole advance support
108mm steel tube shed and diameter 30mm grouting with small pipe, grouting serous fluid use cement single slurry；Then base within the scope of access ramp is abolished
Side wall is cheated, setting grid steel frame and foundation pit side-wall fashioned iron weld；
(3) it carries out tunneling slope section 24 to construct, be excavated using benching tunnelling method, one Pin bracing members spacing of drilling depth, first pneumatically placed concrete,
Steel mesh is hung, bracing members are erected, gunite concrete completes construction channel preliminary bracing structure 9 and access ramp construction channel base plate
10, slope section uses the 13% downward gradient；
(4) it carries out people's air defense flat segments 25 to construct, people's air defense advance support 14 of first constructing is reinforced using grouting with small pipe；Tunnel
It excavates and uses benching tunnelling method, one Pin bracing members spacing of drilling depth, first pneumatically placed concrete, extension steel mesh, erection bracing members, gunite concrete,
Complete oblique people's air defense preliminary bracing structure 15；
(5) after the completion of people's air defense flat segments 25, the high construction of section 26 is chosen into entering the station；Tunnel vault according to 1:3 the gradient gradually
Height is chosen, first construction, which is entered the station, chooses high section advance support 17, reinforces using grouting with small pipe；Tunnel excavation uses benching tunnelling method, drilling depth one
Pin bracing members spacing, first pneumatically placed concrete hang steel mesh, erect bracing members, and gunite concrete is completed tiltedly to enter the station and chooses high section initial stage branch
Protection structure 18 so far completes construction access ramp just branch structure construction；
Step (6)-(10) are the same as embodiment 1.
Structure of the invention and construction method are suitable for quaternary formation and rocky stratum tunneling subway station and big cross section tunnel
The construction in road construction channel, tunneling section answer strict control to excavate drilling depth no more than 1 Pin grid steel frame spacing, in time closing when constructing
Cyclization；Horse-head ingate and process should carry out stratum consolidation when converting；The length of bench that every step in channel is excavated is about 3~5m,
Face is closed when the upper layer excavation intermittent time is longer, using 5cm thickness gunite concrete；Rocky stratum is taken weak quick-fried when constructing
It is broken, soft stratum settable interim inverted arch control deformation when constructing；Reinforce tunnel deformation monitoring simultaneously.
3 embodiments of the invention are described in detail above, but the content is only preferable implementation of the invention
Example, should not be considered as limiting the scope of the invention.It is all according to all the changes and improvements made by the present patent application range
Deng should still be within the scope of the patent of the present invention.
Claims (9)
1. a kind of construction method for doubling as construction access ramp structure using subway entrance, which is characterized in that including open cut opening
Section, tunneling slope section, people's air defense flat segments and enter the station and choose high section, the open cut open-mouth section, tunneling slope section, people's air defense flat segments and into
Station chooses high section and is sequentially connected logical formation construction access ramp structure realization construction level transport, follows the steps below:
(1) open cut open-mouth section foundation pit unwrapping wire positions, and excavates access ramp open cut open-mouth section；Foundation pit side-wall is handled when excavating, is set
Plate brad supporting and fashioned iron and gunite concrete structure are applied, using cast-in-situ bored pile+inner support system as base when the weakness of stratum
Pit enclosure structure applies base plate of foundation pit cushion layer structure after being excavated to foundation pit bottom absolute altitude；
(2) the tunneling advance support that tunneling access ramp arch is set in foundation pit side-wall, into hole advance support using steel tube shed or
Grouting with small pipe；
(3) it carries out tunneling slope section, people's air defense flat segments and enters the station to choose the access ramp boring construction of high section, construction is opened using benching tunnelling method
It digs, setting interim inverted arch together in middle part when geological conditions is poor or monitoring needs, just branch structure construction is main for entrance access ramp
Step are as follows: advance support ductule or anchor pole and slip casting；It excavates, one Pin bracing members spacing of drilling depth；First pneumatically placed concrete hangs reinforcing bar
Net erects bracing members, gunite concrete；Preliminary bracing back-grouting；Carry out next step circulation；
(4) it enters the station after the completion of choosing high section preliminary bracing structure, carries out Station main structure construction；
(5) after the completion of the main structure construction of station, access ramp tunneling slope section bottom is abolished, is excavated to entrance bottom plate mark downwards
Height performs entrance slope section bottom later period excavation entrance just branch structure；Then construction, which is entered the station, chooses high section, people's air defense flat segments extremely
Two lining structure of tunneling slope section, mould build armored concrete；
(6) backfill, which is entered the station, chooses gap above high section and tunneling slope section entrance section arch, and backfill uses C20 concrete, together
When port structure two serve as a contrast arch built-in slip casting pipe, carry out two backing grouting behind shaft or drift lining, guarantee two backings after fill it is closely knit；
(7) entrance open cut open-mouth section is backfilled, open cut waterproof layer and bottom plate, side wall and top board structure are applied；Using plain earthen backfill
To ground elevation at the top of open cut rectangular cross section, entrance internal structure is applied, the subway so far formed as construction access ramp goes out
Entrance.
2. a kind of construction method for doubling as construction access ramp structure using subway entrance according to claim 1, special
Sign is: the construction access ramp utilizes subway port structure, and construction period is using Tunnel structure as construction
Access ramp bearing structure, construction in later period secondary lining form the port structure of subway station；The clear span of construction access ramp uses
Two lining structure width of port structure, the clear span >=4.5m for access ramp of constructing；The clear height of construction access ramp uses entrance knot
Two lining structure height of structure, the clear height >=5.0m for access ramp of constructing.
3. a kind of construction method for doubling as construction access ramp structure using subway entrance according to claim 1, special
Sign is: the open cut open-mouth section includes concrete shield top, foundation pit side-wall supporting, base plate of foundation pit bed course, plate brad supporting, open cut time
Packing course, bed course and open cut waterproof layer, entrance concrete structure, the foundation pit side-wall supporting are set to the upper of base plate of foundation pit bed course
Square two sides, concrete shield top are set to the top of the foundation pit side-wall supporting, and the plate brad supporting is fixed on foundation pit side-wall
The outside of supporting, the open cut backfill layer are filled between the foundation pit side-wall supporting of two sides and base plate of foundation pit bed course, the discrepancy
Mouth concrete structure is located between the foundation pit side-wall supporting of two sides and its top for being located at open cut backfill layer, the entrance are mixed
Xtah Crude Clay structure forms open cut exit and entrance, and the bed course and open cut waterproof layer are set to open cut backfill layer, entrance concrete
Between structure.
4. a kind of construction method for doubling as construction access ramp structure using subway entrance according to claim 3, special
Sign is: in the open cut open-mouth section, the open cut opening segment length is 25-35m, and the foundation pit side-wall supporting is by fashioned iron, soil
Nail, steel mesh and gunite concrete composition, the bed course is close to open cut backfill layer setting, and the open cut waterproof layer is close to entrance
Concrete structure setting.
5. a kind of construction method for doubling as construction access ramp structure using subway entrance according to claim 1, special
Sign is: the tunneling slope section includes tunneling advance support, construction channel preliminary bracing structure, later period excavation entrance just branch
Structure, two lining structure of tunneling slope section, tunneling slope section fill concrete layer, the construction channel preliminary bracing structure setting in
Later period excavates the top of the first branch structure of entrance, and two lining structure of tunneling slope section is set to the construction channel preliminary bracing
Structure, later period excavate the inside of the first branch structure of entrance, and it is logical to offer tunneling slope section in two lining structure of tunneling slope section
Road, the tunneling slope section fill concrete layer are filled in construction channel preliminary bracing structure, two lining structure of tunneling slope section
Between top, the tunneling advance support is set to the tip exterior of the construction channel preliminary bracing structure.
6. a kind of construction method for doubling as construction access ramp structure using subway entrance according to claim 5, special
Sign is: in the tunneling slope section, the gradient≤14% that the tunneling slope section longitudinally uses, the tunneling slope section two is served as a contrast
Structure and tunneling slope section fill concrete layer, construction channel preliminary bracing structure, later period excavate between the first branch structure of entrance
It is provided with the tunneling waterproof layer of perforation, the construction channel preliminary bracing structure is by grid steel frame, steel mesh and gunite concrete
Composition, two lining structure of tunneling slope section are reinforced concrete structure.
7. a kind of construction method for doubling as construction access ramp structure using subway entrance according to claim 1, special
Sign is: the people's air defense flat segments include people's air defense advance support, people's air defense preliminary bracing structure, two lining structure of people's air defense and gate stack knot
Structure, the people's air defense preliminary bracing structure setting is in the top outer of the people's air defense advance support, two lining structure of the people's air defense setting
Antiaircraft tunnel is offered in the inside of the inside of the people's air defense preliminary bracing structure, two lining structure of people's air defense.
8. a kind of construction method for doubling as construction access ramp structure using subway entrance according to claim 1, special
Sign is: described to enter the station that choose high section include entering the station and choosing high section advance support, enter the station and choose high section preliminary bracing structure, enter the station and choose high section
Two lining structures enter the station and choose high section fill concrete layer, it is described enter the station to choose high section advance support and be set to enter the station choose high section initial stage branch
The top outer of protection structure, it is described enter the station to choose high two lining structure of section and be set to described enter the station choose the interior of high section preliminary bracing structure
Portion, described enter the station choose the inside of high two lining structure of section and offer channel of entering the station, and described enter the station chooses high section fill concrete layer setting
High section preliminary bracing structure is chosen, between the top for choosing high two lining structure of section of entering the station in entering the station.
9. a kind of construction method for doubling as construction access ramp structure using subway entrance according to claim 8, special
Sign is: in the people's air defense flat segments, gate stack structure, the lining of people's air defense two knot are downwardly extending at the top of two lining structure of people's air defense
People's air defense waterproof layer is provided between structure, people's air defense preliminary bracing structure；Described enter the station is chosen in high section, and described enter the station chooses the high lining of section two knot
Structure and enter the station choose high section fill concrete layer, entering the station to choose is provided with the waterproof layer that enters the station between high section preliminary bracing structure, it is described into
The vault that high section preliminary bracing structure is chosen at station is raised above station main body vault absolute altitude using the gradient gradual change of 1:3.
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