CN106381874A - Excavation construction technology for subway station foundation pit in upper-soft lower-hard ground - Google Patents
Excavation construction technology for subway station foundation pit in upper-soft lower-hard ground Download PDFInfo
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- CN106381874A CN106381874A CN201610795771.3A CN201610795771A CN106381874A CN 106381874 A CN106381874 A CN 106381874A CN 201610795771 A CN201610795771 A CN 201610795771A CN 106381874 A CN106381874 A CN 106381874A
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- stake holes
- excavation
- construction
- laid
- foundation ditch
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
Abstract
The invention discloses an excavation construction technology for a subway station foundation pit in upper-soft lower-hard ground. The excavation construction technology is characterized in that a middle support structure is arranged in the middle of the constructed subway station foundation pit; a retaining structure of the constructed subway station foundation pit comprises an upper-part retaining structure, a middle-part retaining structure and a lower-part retaining structure; a lower-part foundation pit is divided into an upper foundation pit and a lower foundation pit; the middle support structure comprises a plurality of dug piles; the dug piles are concrete-filled steel pipe piles; and each concrete-filled steel pipe pile comprises a steel pipe support pillar, a middle joint structure and a lower joint structure. The excavation construction of the subway station foundation pit comprises the following steps: A, synchronous construction of the middle support structure and the upper-part retaining structure; B, excavation of an upper-part foundation pit; C, construction of the middle-part retaining structure; D, excavation of the upper foundation pit; and E, excavation of the lower foundation pit. The excavation construction technology is simple in step, reasonable in design, simple and convenient in construction and good in using effect, and ensures that the excavation construction process of the subway station foundation pit in the upper-soft lower-hard ground can be simply, conveniently and quickly completed and is safe and reliable.
Description
Technical field
The invention belongs to metro station construction technical field, especially relate to a kind of upper-soft lower-hard ground Metro station excavation
Excavation construction process.
Background technology
Subway station is a kind of important building in Urban Rail Transit, and it is for passenger's boarding, transfer and time
The place of car.Cap excavation method be when underground engineering is bright do when the Novel engineering that needs the barriers such as highway crossing, building and take apply
Work method, is specifically faced down by ground and is excavated to after certain depth, and by top seal, remaining bottom engineering is in the top cover of closing
Under constructed.Agent structure can be along work it is also possible to inverse make.Using cap excavation method in upper hard lower soft formation construction subway station
When, difficulty of construction is larger.When construction in May Fourth Square station as being pointed to Qingdao City, construction area residing for this station for
On firmly descend soft formation, the top on this stratum is soil layer and its underpart is basement rock, and top board above thickness of earth covering in station is about 5.3 meters,
The following foundation depth of top board is about 13 meters, and foundation ditch width is 45.8 meters, the quick-fried cubic meter of stone 90,000 m to be drilled3.And, to this subway station base
Before hole carries out excavation construction, for guaranteeing the steadiness of station agent structure, the middle part of agent structure is applied from front to back AT STATION
The multiple caisson of work.The hole depth of a diameter of Φ 2m～Φ 3m of constructed caisson and its stake holes is 23m～25m, by being applied
, there is drift sand formation in the consideration complex geologic conditions in building site area, and digging diameter is big, and practice of construction difficulty is larger.And, construct
Process safety is reliably most important.But when nowadays, excavation construction being carried out to upper hard lower soft formation Metro station excavation, especially
The construction information used for reference that middle inside is laid with the Metro station excavation excavation construction of large-diameter bored pile is less, difficulty of construction
Greatly.
Content of the invention
The technical problem to be solved is for above-mentioned deficiency of the prior art, provides a kind of soft lower hard
Strata metro station pit excavation construction process, its processing step is simple, reasonable in design and easy construction, using effect are good, energy
Easy, be rapidly completed upper-soft lower-hard ground Metro station excavation excavation construction process, and work progress is safe and reliable.
For solving above-mentioned technical problem, the technical solution used in the present invention is：A kind of upper-soft lower-hard ground subway station base
Hole excavation construction process it is characterised in that：The medial support structures that constructed Metro station excavation middle inside is provided with, are applied
The building enclosure of work Metro station excavation includes top building enclosure, the middle part from top to bottom Metro station excavation gone along with sb. to guard him
Building enclosure and bottom building enclosure, the stratum of construction area residing for constructed subway station be upper-soft lower-hard ground, described on
Soft lower hard formation includes bottom horizon d and is located at the upper soil horizon above the horizon d of described bottom；Described Metro station excavation divides
Bottom foundation ditch for top foundation ditch and below the foundation ditch of described top, described top foundation ditch is located in described upper soil horizon；
Described top building enclosure includes two upper building enclosures being symmetrically laid in the described top foundation ditch left and right sides, institute
State building enclosure and include the upper cast-in-situ bored pile and that the many sidepiece excavation lines along described top foundation ditch are laid from front to back
Road is supported in the upper Guan Liang on many described upper cast-in-situ bored piles, described upper Guan Liang be reinforced beam, described upper Guan Liang with
Many described upper cast-in-situ bored piles pour and are integrated, and are kept off by upper armored concrete between adjacent two described upper cast-in-situ bored piles
Cob wall is fastenedly connected；The structure of many described upper cast-in-situ bored piles and size all same and it is all laid in same level
On, the bottom height of described upper cast-in-situ bored pile is less than the bottom level of described top foundation ditch；
Described bottom foundation ditch is divided into foundation ditch and the lower foundation ditch below described upper foundation ditch, and described upper foundation ditch is located at described
In upper soil horizon, described lower foundation ditch is located in the horizon d of described bottom；The width of described top foundation ditch is more than described upper foundation ditch
Width, the width of described upper foundation ditch is more than the width of described lower foundation ditch；
Described middle part building enclosure includes two middle building enclosures being symmetrically laid in the described upper foundation ditch left and right sides, described
Middle building enclosure include lower cast-in-situ bored pile that the many sidepiece excavation lines along described upper foundation ditch lay from front to back with together with prop up
Support the lower Guan Liang on many described lower cast-in-situ bored piles, described lower Guan Liang be reinforced beam, described lower Guan Liang with many
Described lower cast-in-situ bored pile pours and is integrated, by lower reinforced concrete retaining wall between adjacent two described lower cast-in-situ bored piles
It is fastenedly connected；The structure of many described lower cast-in-situ bored piles and size all same and its be all laid in same level,
The bottom height of described lower cast-in-situ bored pile is less than the bottom level of described upper foundation ditch；
Described bottom building enclosure includes two lower building enclosures being symmetrically laid in the described lower foundation ditch left and right sides, described
Lower building enclosure includes multiple tracks along the bottom anchor cable laid from front to back of sidepiece excavation line of described lower foundation ditch, bottom described in multiple tracks
Anchor cable is all laid on same plane and it is all laid in the upper outside of described lower foundation ditch, described bottom anchor cable from the inside to the outside by
Gradually downward-sloping；
Described medial support structures include multiple caissons, and multiple described caissons are along the longitudinal length of Metro station excavation
Direction is laid from front to back, and multiple described caisson is all in vertically to laying；Described caisson is steel tube concrete pile,
A diameter of Φ 550mm～Φ 650mm of described steel tube concrete pile；Described steel tube concrete pile is included positioned at constructed subway
Steel pipe support post in standing, the interior joint being laid in the middle part of steel pipe support post construct and are laid in the lower section of steel pipe support post bottom
Point construction, described steel pipe support post is in vertically to laying；The agent structure of constructed subway station includes base plate, two difference cloth
Be located at the side wall above the base plate left and right sides, be located at top board directly over base plate and one be laid in described top board and base plate it
Between middle plate, the left and right sides of described base plate, described top board and described middle plate is all connected as one with described side wall；Described steel pipe
The top and the bottom of support column are separately fixed on described top board and base plate, are provided with the middle plate-girder in horizontal layout in described middle plate,
Described middle plate-girder is laid along the transverse width direction of constructed subway station, and described base plate, described middle plate and middle plate-girder are equal
For reinforced concrete structure；Described interior joint construction includes round tray on steel pipe support post for the coaxial package, described circle
Pallet is in horizontal layout, and described middle plate-girder is supported on round tray, and described round tray is located at below middle plate-girder, described circle
Pallet is installed on steel pipe support post, and described steel pipe support post therefrom passes through in plate-girder；Described lower node construction is included by up to
The upper reinforcing structure of lower laying, middle reinforcing structure and lower reinforcing structure, described upper reinforcing structure and lower reinforcing structure symmetrically cloth
If described upper reinforcing structure, middle reinforcing structure and lower reinforcing structure all pour in base plate；Described upper reinforcing structure includes multiple
Along the circumferential direction uniformly it is laid in the upper stiffener on steel pipe support post lateral wall, multiple described upper stiffeners are all laid in same
On horizontal plane；Described middle reinforcing structure includes putting more energy in multiple being along the circumferential direction uniformly laid on steel pipe support post lateral wall
Part, multiple described middle stiffeners are all laid in same level；Described lower reinforcing structure includes multiple along the circumferential direction uniform
It is laid in the lower stiffener on steel pipe support post lateral wall, multiple described lower stiffeners are all laid in same level；
When excavation construction is carried out to Metro station excavation, comprise the following steps：
Step A, medial support structures and top building enclosure synchronous construction：To described medial support structures and described top
Building enclosure is constructed respectively；
Wherein, when described medial support structures being constructed, from front to back to multiple in described medial support structures
Described caisson is constructed respectively, the construction method all same of multiple described drilled piles；
To when any one described, drilled pile is constructed, process is as follows：
Step one, pore digging：From top to bottom the stake holes of constructed caisson is excavated, described stake holes (15-1) point
Bottom stake holes for top stake holes and below the stake holes of described top, described top stake holes is located in described upper soil horizon, institute
State bottom stake holes to be located in the horizon d of described bottom；When described stake holes is excavated, process is as follows：
Step 101, top pore digging：Using manually from top to bottom excavating to described top stake holes, including following
Step：
Step 1011, aperture are excavated and locking notch structure construction：Excavated in the aperture section of described top stake holes, and opened
Scrape out construction locking notch structure in the described aperture section of type；
Described locking notch structure includes the cylindric ruggedized construction in the aperture of stake holes and is laid in cylindric reinforcing
Round ring boss in structure, described cylindrical shape ruggedized construction and round ring boss is reinforced concrete structure and the two pours
Build and be integrated；Described cylindrical shape ruggedized construction is in vertically to laying, and described round ring boss is in coaxial with cylindric ruggedized construction
Lay, and round ring boss is in horizontal layout and it is located at the surface of cylindric ruggedized construction；Described round ring boss interior
Footpath is identical with the internal diameter of cylindric ruggedized construction, and the external diameter of described round ring boss is more than the external diameter of cylindric ruggedized construction；Institute
State stake holes and be located at the caisson stake holes being laid in constructed subway station middle inside, the aperture of described stake holes is Φ 2m～Φ 3m
And its aperture is identical with the diameter of described caisson, the internal diameter of described round ring boss is less than the aperture of stake holes and its external diameter is more than
The aperture of stake holes；The length that described cylindrical shape ruggedized construction extend out to ground is 20cm～50cm, described cylindrical shape ruggedized construction
Inside it is provided with cylindric steel reinforcement cage, described cylindrical shape steel reinforcement cage includes multiple tracks and is along the circumferential direction uniformly laid in same level
Vertical reinforcement and the ring-shaped stirrup from top to bottom laid of multiple tracks, ring-shaped stirrup described in multiple tracks is all in level to laying, multiple tracks institute
State vertical reinforcement and be fastenedly connected by ring-shaped stirrup described in multiple tracks and be integrated；The top of vertical reinforcement described in per pass all stretches to circle
In annular boss；
Described top stake holes is from top to bottom divided into multiple stake holes sections, the length of described stake holes sections be 500mm～
1000mm, is provided with dado structure in each described stake holes sections, and described dado structure is xoncrete structure；Multiple described stakes
The stake holes sections being located at topmost in the sections of hole is top segment, and the dado structure in described top segment is located at cylindric reinforcing
Below structure and the two pours and is integrated；The aperture of described stake holes is Φ 2m～Φ 3m and it is in vertically to laying；
Step 1012, top stake holes are subsequently excavated：From top to bottom to the multiple described stake holes sections in the stake holes of described top
Excavated respectively；Often excavate and complete a described stake holes sections, retaining wall of all constructing in the described stake holes sections excavating molding
Structure；After the completion for the treatment of the dado structure construction in a described stake holes sections, more next described stake holes sections is opened
Dig；
Step 2, steel pipe column lifting：Described steel pipe column is from top to bottom lifted in stake holes described in step one, and makes institute
State the middle inside that steel pipe column is located at described stake holes；
Step 3, filling concrete：By grouting pipe to concrete perfusion in steel pipe support post；Treat institute's concrete perfusion
After solidification, obtain the caisson that construction completes；
Step B, top excavation of foundation pit：From top to bottom described top foundation ditch is excavated；
Step C, the construction of middle part building enclosure：Described middle part building enclosure is constructed；
Step D, upper excavation of foundation pit：From top to bottom described upper foundation ditch is excavated；
Step E, lower excavation of foundation pit：Using Blasting Excavation mode, described lower foundation ditch is excavated, described lower excavation of foundation pit
During, from top to bottom described bottom building enclosure is constructed.
Above-mentioned upper-soft lower-hard ground Metro station excavation excavation construction process, is characterized in that：Described upper building enclosure is also wrapped
Include cable bolting structure, described upper cable bolting structure includes anchor cable group and is located at the lower anchor cable below described upper anchor cable group
Group, described upper anchor cable group includes multiple tracks along the upper anchor cable laid from front to back of sidepiece excavation line of described top foundation ditch, multiple tracks institute
State that anchor cable is all laid on same plane and it is all laid in the upper outside of described top foundation ditch, described upper anchor cable by interior extremely
Tilt gradually downward outward；Described lower anchor cable group includes multiple tracks and lays down from front to back along the sidepiece excavation line of described top foundation ditch
Anchor cable, lower anchor cable described in multiple tracks uniformly sets at grade and it is all laid in the lower outside of described top foundation ditch, described
Lower anchor cable tilts from the inside to the outside gradually downward；
Described middle building enclosure also includes stream line supporting construction, and described stream line supporting construction includes multiple tracks along on described
The stream line that the sidepiece excavation line of foundation ditch is laid from front to back, described in multiple tracks, stream line is all laid on same plane and it is uniform
It is located at the upper outside of described upper foundation ditch, described stream line tilts from the inside to the outside gradually downward；
When described middle part building enclosure being constructed in step A, to the upper cast-in-situ bored pile in described upper building enclosure
Constructed with upper Guan Liang；
Carry out in step B in the Excavation Process of top, from top to bottom to the described upper reinforcing bar in described upper building enclosure
Concrete retaining wall and described upper cable bolting structure are constructed respectively；
Carry out in step C middle part building enclosure construction when, to the lower cast-in-situ bored pile in the building enclosure of described middle part and under
Guan Liang is constructed；
Carry out in step D in upper Excavation Process, from top to bottom the described lower reinforcing bar in the building enclosure of described middle part mixes
Solidifying soil retaining wall and described stream line supporting construction are constructed respectively.
Above-mentioned upper-soft lower-hard ground Metro station excavation excavation construction process, is characterized in that：Described steel pipe support column bottom
Stretch in the bottom horizon d below base plate, described steel pipe support column bottom stretches to bottom basement rock in the layer bottom segment,
The length of described bottom segment is 2.5m～3.5m；
The bottom stake holes section for the insertion of described bottom segment, the side wall of described bottom segment is had in the horizon d of described bottom
On have multiple injected holes, be by the stake holes inner concrete of concreting between described bottom segment and bottom horizon d
Structure, multiple rows of described shear bar all pours in stake holes inner concrete structure；Being located at the sections below base plate in described stake holes is
Bottom stake holes section；
When carrying out filling concrete in step 3, it is irrigated from the bottom to top, be poured into the coagulation in described bottom segment
Soil enters bottoms stake holes section through multiple described injected holes, and obtains construction and complete stake holes inner concrete structure.
Above-mentioned upper-soft lower-hard ground Metro station excavation excavation construction process, is characterized in that：Carry out concrete in step 3
During perfusion, the concrete being irrigated is self-compacting concrete.
Above-mentioned upper-soft lower-hard ground Metro station excavation excavation construction process, is characterized in that：Described steel pipe support post interior
Upper lateral part is provided with steel reinforcement cage, and described grouting pipe is in vertically to laying and it is located at the middle inside of described stake holes, described note
Slurry conduit passes through from steel reinforcement cage middle inside；
When carrying out filling concrete in step 3, method is left using high-altitude and is irrigated by grouting pipe.
Above-mentioned upper-soft lower-hard ground Metro station excavation excavation construction process, is characterized in that：Cylinder described in step 1011
The total height of shape ruggedized construction and round ring boss is 800mm～1200mm；
The wall thickness of described cylindrical shape ruggedized construction is 80mm～120mm, the width d1=180mm of described round ring boss～
220mm and its height h1=80mm～120mm.
Above-mentioned upper-soft lower-hard ground Metro station excavation excavation construction process, is characterized in that：Multiple described in step 1011
The stake holes sections being located at topmost in stake holes sections is top segment, and the dado structure in described top segment is located at cylindric adding
Below fixing structure and the two pours and is integrated；
Dado structure in described top segment is divided into top dado structure and is located at immediately below the dado structure of described top
Bottom dado structure, the external diameter of described top dado structure is from top to bottom gradually reduced and its internal diameter from top to bottom gradually increases
Greatly, the top outer diameter of described top dado structure is identical with the external diameter of cylindric ruggedized construction；Outside the dado structure of described bottom
Footpath all same and its external diameter is identical with the bottom external diameter of described top dado structure from top to bottom, described bottom dado structure outer
Footpath is identical with the aperture of stake holes.
Above-mentioned upper-soft lower-hard ground Metro station excavation excavation construction process, is characterized in that：Neighbouring two described shields
Wall construction pours and is integrated, and in neighbouring two described dado structures, underlying dado structure top stretches to positioned at upper
The dado structure of side is interior and built-in length is 50mm～100mm；
In multiple described stake holes sections, all stake holes sections in addition to described top segment are lower stake holes sections, described under
The structure of dado structure and size all same in stake holes sections, in the sections of lower pile hole, the external diameter of dado structure is equal from top to bottom
Identical and its internal diameter is from top to bottom gradually reduced, and in the sections of lower pile hole, the external diameter of dado structure is identical with the aperture of stake holes.
Above-mentioned upper-soft lower-hard ground Metro station excavation excavation construction process, is characterized in that：By upper in described bottom segment
To being arranged with multiple rows of shear bar, often arrange described shear bar and all include multiple tracks and be along the circumferential direction uniformly laid in outside steel pipe support post
Shear bar on the wall of side, described in multiple tracks, shear bar is all laid in same level.
Above-mentioned upper-soft lower-hard ground Metro station excavation excavation construction process it is characterised in that：Described round tray includes
Lower annular plate, it is located at upper annular plate and multiple lower annular plate and upper annular plate of being supported in directly over lower annular plate
Between support member, multiple described support members along the circumferential direction uniformly lay, and described lower annular plate and upper annular plate are in all
Horizontal layout.
The present invention compared with prior art has advantages below：
1st, processing step is simple, reasonable in design and easy construction, puts into construction cost relatively low.
2nd, the support system reasonable in design being adopted and easy construction, to put into construction cost relatively low.
3rd, the support system being adopted includes the building enclosure being laid in outside constructed Metro station excavation and is laid in
The medial support structures of Metro station excavation middle inside, carry out firm support from outside and middle part, really to Metro station excavation
Protect the steadiness in Excavation Process and after the completion of excavation of foundation pit, and can guarantee that work progress is safe and reliable.And, adopted
Medial support structures supporting effect is good, matches with building enclosure, can ensure that in Excavation Process and excavation of foundation pit is complete
Steadiness after one-tenth.And, medial support structures can be used as the middle part force structure of main structure of subway station.
4th, the borehole pilework being adopted is simple and easy construction, using effect are good, puts into construction cost relatively low, in steel pipe
The middle part of support column and bottom separately design rational in infrastructure and the good joint structure of using effect, not only easy construction, and make
Good with effect, construction quality is easy to ensure.
5th, the interior joint structural texture being adopted is simple, reasonable in design and processing and fabricating and installation fix simplicity, using effect
Really good, including round tray on steel pipe column for the coaxial package, it is supported using round tray centering plate-girder, and circular support
Disk is located at below middle plate-girder.
6th, the interior joint being adopted constructs easy construction and using effect is good, and the node between steel pipe column and middle plate-girder is entered
During row construction, there is no any weld job, steel beam column is notheated deformation, the deformation being prevented effectively from because of steel tubular column joints is big
The hidden danger of quality causing, and manually the amount of devoting oneself to work is little, and steel usage amount is little, compares conventional node and saves steel 65.4%.
This interior joint configurations is simple, reasonable in design and processing and fabricating and easy construction, using effect good, welding during node construction
Operation, economical and practical.
7th, the lower node structural texture being adopted is simple, reasonable in design and processing and fabricating and installation fix simplicity, using effect
Really good, lower node construction includes upper reinforcing structure, middle reinforcing structure and the lower reinforcing structure from top to bottom laid, knot of above putting more energy into
Structure, middle reinforcing structure and lower reinforcing structure all pour in base plate；And, steel pipe support column bottom stretches to the bottom below base plate
In portion's horizon d, bottom segment is from top to bottom provided with multiple rows of shear bar and its side wall and has multiple injected holes, bottom is saved
Section and multiple rows of shear bar all pour in stake holes inner concrete structure, and fixed and easy construction is carried out to steel pipe support post
During concreting, synchronization carries out pouring construction to stake holes inner concrete structure.And, lower node construction and subway station main body
Bottom horizon d below base plate in structure and base plate is all fastenedly connected and is integrated, and can effectively improve the mechanical property of steel pipe column
Can, stressed effect is more preferably.
8th, the locking notch structure in top stake holes aperture is simple and easy construction, puts into construction cost relatively low.
9th, the locking notch structure reasonable in design in top stake holes aperture, easy construction and using effect is good, including positioned at stake
Cylindric ruggedized construction in the aperture in hole and the round ring boss being laid in cylindric ruggedized construction, cylindric reinforcing is tied
The length that structure extend out to ground is 20cm～50cm, is provided with cylindric steel reinforcement cage, cylindric reinforcing bar in cylindric ruggedized construction
Cage includes vertical reinforcement that multiple tracks is along the circumferential direction uniformly laid in same level and the annular that multiple tracks is from top to bottom laid
Stirrup, the top of per pass vertical reinforcement all stretches in round ring boss, by round ring boss in order to dash and protection, and
And cylindrical shape ruggedized construction extend out to ground and extend out to ground, and to cylindric ruggedized construction and the top retaining wall being disposed below
Structure is defined, and is further ensured that fore shaft effect, and energy is easy, be rapidly completed stake holes fore shaft process, and fore shaft effect is good, energy
Effective protection is carried out to stake holes aperture.
10th, the dado structure of top stake holes is reasonable in design and easy construction, and retaining wall effect is good, is particularly suited for there is quicksand
The upper soil horizon of layer.
11st, easy construction and construction quality are easy to ensure, the Design of Retaining Structure being adopted is rationally and easy construction, use
Effect is good, goes along with sb. to guard him knot for soft lower hardcore using the top building enclosure from top to bottom laid, middle part building enclosure and bottom
Structure combines and foundation ditch is gone along with sb. to guard him, and the Metro station excavation of construction molding effectively can be gone along with sb. to guard him it is ensured that construction molding base
Steadiness；Meanwhile, the caisson reasonable in design of construction molding and good mechanical performance, the agent structure of caisson is steel
Tubing string, steel pipe column bottom is anchoring section and its top to be fastenedly connected with the top board of subway station and is integrated, and whole structure is good, and
Construction quality is easy to ensure.During practice of construction, before the top board in main structure of subway station is constructed, in needing to complete
Between support (i.e. the work progress of construct caisson), this caisson be steel core concrete column.Steel pipe column completes in shop-fabricated
Scene is disposable to install, easy construction, and can effectively strengthen the excavation of foundation pit steadiness of upper-soft lower-hard ground.Using energy of the present invention
Easy, be rapidly completed kind of a upper-soft lower-hard ground Metro station excavation excavation construction process.
In sum, present invention process step is simple, reasonable in design and easy construction, using effect are good, can be easy, quick
Complete upper-soft lower-hard ground Metro station excavation excavation construction process, and work progress is safe and reliable.
Below by drawings and Examples, technical scheme is described in further detail.
Brief description
Fig. 1 is the process flow diagram of the present invention.
Fig. 1-1 is the structural representation of support system of the present invention.
Fig. 2 is the structural representation of steel pipe column of the present invention.
Fig. 3 is the connection status schematic diagram of steel pipe column of the present invention and round tray.
Fig. 4 is Construction State schematic diagram during reinforcing bar cage hoisting of the present invention.
Fig. 5 is the Construction State schematic diagram during anchoring section filling concrete of the present invention.
Fig. 6 is the Construction State schematic diagram after the completion of filling concrete of the present invention.
Fig. 7 is the structural representation of locking notch structure of the present invention.
Fig. 8 is the structural representation of dado structure in the stake holes of top of the present invention.
Fig. 9 is the construction method FB(flow block) of caisson of the present invention.
Description of reference numerals:
1 steel pipe support post；2 round trays；Plate-girder in 3；
4 base plates；Reinforcing structure on 5；Reinforcing structure in 6；
7 times reinforcing structures；8 bottom horizon ds；9 shear bars；
10 bottom stake holes sections；11 injected holes；12 stake holes inner concrete structures；
13 grouting pipe；14 steel reinforcement cages；15-1 stake holes；
15-2 cylindrical shape ruggedized construction；15-3 round ring boss；15-4 vertical reinforcement；
15-5 ring-shaped stirrup；15-6 dado structure；16-5 Metro station excavation；
The upper cast-in-situ bored pile of 16-6；The upper Guan Liang of 16-7；Cast-in-situ bored pile under 16-8；
Guan Liang under 16-9；16-10 bottom anchor cable；The upper anchor cable of 16-11；
Anchor cable under 16-12；16-13 stream line；16-14 anchor pole.
Specific embodiment
A kind of upper-soft lower-hard ground Metro station excavation excavation construction process as shown in Figure 1, constructed subway station base
The medial support structures that hole 16-5 middle inside is provided with, the building enclosure of constructed Metro station excavation 16-5 is included by up to
Under top building enclosure, middle part building enclosure and bottom building enclosure that Metro station excavation 16-5 is gone along with sb. to guard him, constructed
The stratum of construction area residing for subway station is upper-soft lower-hard ground, and described upper-soft lower-hard ground includes bottom horizon d and is located at
Upper soil horizon above the horizon d of described bottom；Described Metro station excavation 16-5 is divided into top foundation ditch and is located at described top base
The bottom foundation ditch of hole lower section, described top foundation ditch is located in described upper soil horizon, refers to Fig. 1-1；
Described top building enclosure includes two upper building enclosures being symmetrically laid in the described top foundation ditch left and right sides, institute
State building enclosure and include the upper cast-in-situ bored pile 16-6 that the many sidepiece excavation lines along described top foundation ditch are laid from front to back
It is supported in upper Guan Liang 16-7 on many described upper cast-in-situ bored pile 16-6 together, described upper Guan Liang 16-7 is armored concrete
Beam, described upper Guan Liang 16-7 upper cast-in-situ bored pile 16-6 described with many pours and is integrated, adjacent two described upper drill-pourings
It is fastenedly connected by upper reinforced concrete retaining wall between stake 16-6；The structure of many described upper cast-in-situ bored pile 16-6 and
Size all same and its be all laid in same level, the bottom height of described upper cast-in-situ bored pile 16-6 is less than described top
The bottom level of foundation ditch；
Described bottom foundation ditch is divided into foundation ditch and the lower foundation ditch below described upper foundation ditch, and described upper foundation ditch is located at described
In upper soil horizon, described lower foundation ditch is located in the horizon d of described bottom；The width of described top foundation ditch is more than described upper foundation ditch
Width, the width of described upper foundation ditch is more than the width of described lower foundation ditch；
Described middle part building enclosure includes two middle building enclosures being symmetrically laid in the described upper foundation ditch left and right sides, described
Middle building enclosure includes the lower cast-in-situ bored pile 16-8 and that the many sidepiece excavation lines along described upper foundation ditch are laid from front to back
Road is supported in lower Guan Liang 16-9 on many described lower cast-in-situ bored pile 16-8, and described lower Guan Liang 16-9 is reinforced beam,
Described lower Guan Liang 16-9 lower cast-in-situ bored pile 16-8 described with many pours and is integrated, adjacent two described lower cast-in-situ bored piles
It is fastenedly connected by lower reinforced concrete retaining wall between 16-8；The structure of many described lower cast-in-situ bored pile 16-8 and chi
Very little all same and its be all laid in same level, the bottom height of described lower cast-in-situ bored pile 16-8 is less than described upper foundation ditch
Bottom level；
Described bottom building enclosure includes two lower building enclosures being symmetrically laid in the described lower foundation ditch left and right sides, described
Lower building enclosure includes multiple tracks along the bottom anchor cable 16-10 that lays from front to back of sidepiece excavation line of described lower foundation ditch, multiple tracks institute
State that bottom anchor cable 16-10 is all laid on same plane and it is all laid in the upper outside of described lower foundation ditch, described bottom anchor
Rope 16-10 tilts from the inside to the outside gradually downward；
Described medial support structures include multiple caissons, and multiple described caissons are along the longitudinal direction of Metro station excavation 16-5
Length direction is laid from front to back, and multiple described caisson is all in vertically to laying；Described caisson is steel tube concrete
Native stake, a diameter of Φ 550mm～Φ 650mm of described steel tube concrete pile；In conjunction with Fig. 2, described steel tube concrete pile includes position
Steel pipe support post 1 in constructed subway station, the interior joint being laid in the middle part of steel pipe support post 1 construct and are laid in steel pipe
The lower node construction of support column 1 bottom, described steel pipe support post 1 is in vertically to laying；The agent structure of constructed subway station
The top board including 4, two side walls being laid in respectively above base plate 4 left and right sides of base plate, being located at base plate 4 surface and a cloth
Be located at the middle plate between described top board and base plate 4, the left and right sides of described base plate 4, described top board and described middle plate all with described
Side wall connects as one；The top and the bottom of described steel pipe support post 1 are separately fixed on described top board and base plate 4, in described middle plate
It is provided with the middle plate-girder 3 in horizontal layout, described middle plate-girder 3 is laid along the transverse width direction of constructed subway station,
Described base plate 4, described middle plate and middle plate-girder 3 are reinforced concrete structure；As shown in figure 3, described interior joint construction is included together
Axle sleeve is contained in the round tray 2 on steel pipe support post 1, and described round tray 2 is in horizontal layout, and described middle plate-girder 3 is supported in circle
On shape pallet 2, described round tray 2 is located at below middle plate-girder 3, and described round tray 2 is installed on steel pipe support post 1, described
Steel pipe support post 1 therefrom passes through in plate-girder 3；Upper reinforcing structure 5 that described lower node construction includes from top to bottom laying, in put more energy into
Structure 6 and lower reinforcing structure 7, described upper reinforcing structure 5 and lower reinforcing structure 7 are symmetrically laid, described upper reinforcing structure 5, in
Reinforcing structure 6 and lower reinforcing structure 7 all pour in base plate 4；Described upper reinforcing structure 5 includes multiple along the circumferential direction uniform cloth
It is located at the upper stiffener on steel pipe support post 1 lateral wall, multiple described upper stiffeners are all laid in same level；Described
Middle reinforcing structure 6 includes multiple middle stiffeners being along the circumferential direction uniformly laid on steel pipe support post 1 lateral wall, multiple described
Middle stiffener is all laid in same level；Described lower reinforcing structure 7 includes multiple being along the circumferential direction uniformly laid in steel pipe
Lower stiffener on support column 1 lateral wall, multiple described lower stiffeners are all laid in same level；
When excavation construction is carried out to Metro station excavation 16-5, comprise the following steps：
Step A, medial support structures and top building enclosure synchronous construction：To described medial support structures and described top
Building enclosure is constructed respectively；
Wherein, when described medial support structures being constructed, from front to back to multiple in described medial support structures
Described caisson is constructed respectively, the construction method all same of multiple described drilled piles；
As shown in figure 9, to when any one described, drilled pile is constructed, process is as follows：
Step one, pore digging：From top to bottom stake holes 15-1 of constructed caisson is excavated, described stake holes 15-1
It is divided into top stake holes and the bottom stake holes below the stake holes of described top, described top stake holes is located in described upper soil horizon,
Described bottom stake holes is located in the horizon d of described bottom；When described stake holes 15-1 is excavated, process is as follows：
Step 101, top pore digging：Using manually from top to bottom excavating to described top stake holes, including following
Step：
Step 1011, aperture are excavated and locking notch structure construction：Excavated in the aperture section of described top stake holes, and opened
Scrape out construction locking notch structure in the described aperture section of type；
Described locking notch structure includes cylindric ruggedized construction 15-2 in the aperture of stake holes 15-1 and is laid in circle
Round ring boss 15-3 in tubular ruggedized construction 15-2, described cylindrical shape ruggedized construction 15-2 and round ring boss 15-3 are
Reinforced concrete structure and the two pour and be integrated；Described cylindrical shape ruggedized construction 15-2 is in vertically the described annular to laying
Boss 15-3 and cylindric ruggedized construction 15-2 be in coaxial lay, and round ring boss 15-3 be in horizontal layout and its positioned at cylinder
The surface of shape ruggedized construction 15-2；The internal diameter phase of the internal diameter of described round ring boss 15-3 and cylindric ruggedized construction 15-2
With the external diameter of described round ring boss 15-3 is more than the external diameter of cylindric ruggedized construction 15-2；Described stake holes 15-1 is located to be laid
In the caisson stake holes of constructed subway station middle inside, the aperture of described stake holes 15-1 be Φ 2m～Φ 3m and its aperture with
The diameter of described caisson is identical, and the internal diameter of described round ring boss 15-3 is less than the aperture of stake holes 15-1 and its external diameter is more than stake
The aperture of hole 15-1；The length that described cylindrical shape ruggedized construction 15-2 extend out to ground is 20cm～50cm, and described cylindrical shape adds
It is provided with cylindric steel reinforcement cage, described cylindrical shape steel reinforcement cage includes multiple tracks and is along the circumferential direction uniformly laid in together in fixing structure 15-2
Ring-shaped stirrup 15-5, ring-shaped stirrup 15- described in multiple tracks that vertical reinforcement 15-4 on one horizontal plane and multiple tracks are from top to bottom laid
5 all in level to laying, vertical reinforcement 15-4 described in multiple tracks is fastenedly connected by ring-shaped stirrup 15-5 described in multiple tracks and is integrated；Often
Described in road, the top of vertical reinforcement 15-4 all stretches in round ring boss 15-3；
Described top stake holes is from top to bottom divided into multiple stake holes sections, the length of described stake holes sections be 500mm～
1000mm, is provided with dado structure 15-6 in each described stake holes sections, described dado structure 15-6 is xoncrete structure；Many
The stake holes sections being located at topmost in individual described stake holes sections is top segment, the dado structure 15-6 position in described top segment
Below cylindric ruggedized construction 15-2 and the two pours and is integrated；The aperture of described stake holes 15-1 be Φ 2m～Φ 3m and its be in
Vertically to laying；
Step 1012, top stake holes are subsequently excavated：From top to bottom to the multiple described stake holes sections in the stake holes of described top
Excavated respectively；Often excavate and complete a described stake holes sections, retaining wall of all constructing in the described stake holes sections excavating molding
Structure 15-6；After the completion for the treatment of the dado structure 15-6 construction in a described stake holes sections, then to next described stake holes section
Duan Jinhang excavates；
Step 2, steel pipe column lifting：Described steel pipe column is from top to bottom lifted in stake holes 15-1 described in step one, and
Described steel pipe column is made to be located at the middle inside of described stake holes 15-1；
Step 3, filling concrete：By grouting pipe 13 to concrete perfusion in steel pipe support post 1；Wait to be irrigated and mix
After solidifying soil solidification, obtain the caisson that construction completes；
Step B, top excavation of foundation pit：From top to bottom described top foundation ditch is excavated；
Step C, the construction of middle part building enclosure：Described middle part building enclosure is constructed；
Step D, upper excavation of foundation pit：From top to bottom described upper foundation ditch is excavated；
Step E, lower excavation of foundation pit：Using Blasting Excavation mode, described lower foundation ditch is excavated, described lower excavation of foundation pit
During, from top to bottom described bottom building enclosure is constructed.
In the present embodiment, described medial support structures and described building enclosure form support system, refer to Fig. 1-1.
In the present embodiment, described upper building enclosure also includes cable bolting structure, and described upper cable bolting structure includes
Upper anchor cable group and the lower anchor cable group below described upper anchor cable group, described upper anchor cable group includes multiple tracks along described top foundation ditch
The upper anchor cable 16-11 that sidepiece excavation line is laid from front to back, upper anchor cable 16-11 described in multiple tracks is all laid on same plane and it
All it is laid in the upper outside of described top foundation ditch, described upper anchor cable 16-11 tilts from the inside to the outside gradually downward；Described lower anchor cable
Group includes multiple tracks along the lower anchor cable 16-12 that lays from front to back of sidepiece excavation line of described top foundation ditch, time anchor cable described in multiple tracks
16-12 is all laid on same plane and it is all laid in the lower outside of described top foundation ditch, and described lower anchor cable 16-12 is by interior
To tilting gradually downward outward；
Described middle building enclosure also includes stream line supporting construction, and described stream line supporting construction includes multiple tracks along described
The stream line 16-13 that the sidepiece excavation line of upper foundation ditch is laid from front to back, stream line 16-13 described in multiple tracks are all laid in same flat
On face and it is all laid in the upper outside of described upper foundation ditch, described stream line 16-13 tilts from the inside to the outside gradually downward；
When described middle part building enclosure being constructed in step A, to the upper cast-in-situ bored pile in described upper building enclosure
16-6 and upper Guan Liang 16-7 are constructed；
Carry out in step B in the Excavation Process of top, from top to bottom to the described upper reinforcing bar in described upper building enclosure
Concrete retaining wall and described upper cable bolting structure are constructed respectively；
When carrying out middle part building enclosure construction in step C, to the lower cast-in-situ bored pile 16-8 in the building enclosure of described middle part
Constructed with lower Guan Liang 16-9；
Carry out in step D in upper Excavation Process, from top to bottom the described lower reinforcing bar in the building enclosure of described middle part mixes
Solidifying soil retaining wall and described stream line supporting construction are constructed respectively.
In the present embodiment, multiple described caissons are in uniform laying.
In the present embodiment, described steel pipe support post 1 bottom stretches in the bottom horizon d 8 of base plate 4 lower section, described steel pipe
Support column 1 bottom stretches to the bottom segment in bottom horizon d 8, and the length of described bottom segment is 2.5m～3.5m.
And, multiple rows of shear bar 9 is from top to bottom provided with described bottom segment, often arrange described shear bar 9 all include many
Road is along the circumferential direction uniformly laid in the shear bar 9 on steel pipe support post 1 lateral wall, and shear bar 9 described in multiple tracks is all laid in same
On one horizontal plane.
In the present embodiment, in described bottom horizon d 8, have the bottom stake holes section 10 for the insertion of described bottom segment, described
Have multiple injected holes 11 on the side wall of bottom segment, be by concreting between described bottom segment and bottom horizon d 8
Stake holes inner concrete structure 12, multiple rows of described shear bar 9 all pours in stake holes inner concrete structure 12.
During practice of construction, multiple described injected holes 11 are in uniform laying, and multiple described injected hole 11 is in quincunx laying.
In the present embodiment, described upper stiffener includes upper connector and in vertically to the upper stiffener laid, described upper company
Fitting is L-shaped connector, and described upper connector is fixed on the lateral wall of steel pipe support post 1, and described upper stiffener is fixed on institute
State on upper connector, described upper stiffener is fixed on steel pipe support post 1 by described upper connector；Described lower stiffener includes
Lower connector and to the lower stiffener laid, described lower connector is L-shaped connector in vertically, described lower connector is fixed on steel
On the lateral wall of pipe support column 1, described lower stiffener is fixed on described lower connector, and described lower stiffener passes through described lower company
Fitting is fixed on steel pipe support post 1；Described upper stiffener and described lower stiffener are triangular plate.
In the present embodiment, described middle stiffener includes middle connector and in vertically to the middle stiffener laid, described middle company
Fitting is L-shaped connector, and described middle connector is fixed on the lateral wall of steel pipe support post 1, and described middle stiffener is fixed on institute
State on upper connector, described middle stiffener is fixed on steel pipe support post 1 by described middle connector；Open on described middle stiffener
There are multiple through holes.
Thus, described middle stiffener forms a PBL shear connector, strengthens shearing strength, effectively improves steel pipe support
Bonding strength between post 1 bottom and stake holes inner concrete structure 12.
For improving the bonding strength between steel pipe support post 1 bottom and stake holes inner concrete structure 12 further, described in
Zigzag is processed in the outside of stiffener.
In the present embodiment, described round tray 2 is weldingly fixed on steel pipe column 1.
As shown in Fig. 2 described round tray 2 include lower annular plate 2-1, be located at lower annular plate 2-1 directly over upper
Annular plate 2-2 and multiple support member 2-3 being supported between lower annular plate 2-1 and upper annular plate 2-2, multiple described
Support member 2-3 is along the circumferential direction uniformly laid, and described lower annular plate 2-1 and upper annular plate 2-2 are all in horizontal layout.
In the present embodiment, multiple described support member 2-3 are in vertically to the gripper shoe laid.
And, described gripper shoe is steel plate, described lower annular plate 2-1 and upper annular plate 2-2 is steel plate.
In the present embodiment, all with welding side between each described gripper shoe and lower annular plate 2-1 and upper annular plate 2-2
Formula is fixedly connected.
And, described lower annular plate 2-1 and upper annular plate 2-2 is all weldingly fixed on steel pipe column 1, each described
The medial wall of fagging is all weldingly fixed on steel pipe column 1.
During practice of construction, before described middle plate-girder 3 is constructed, first round tray 2 is fixed on steel pipe column 1.To steel
When node between tubing string 1 and middle plate-girder 3 is constructed, only need centering plate-girder 3 to be constructed, and make steel pipe column 1 therefrom plate-girder 3
The interior middle plate-girder 3 through, construction molding is located at below middle plate-girder 3.Thus, practice of construction is easy, to steel pipe column 1 and middle plate
When node between beam 3 is constructed, there is no any weld job, construction volume is little, easy construction, quick.
In the present embodiment, as shown in figure 1, described building enclosure includes from top to bottom Metro station excavation 16-5 being enclosed
The top building enclosure of shield, middle part building enclosure and bottom building enclosure, the stratum of construction area residing for constructed subway station
For upper-soft lower-hard ground, described upper-soft lower-hard ground includes bottom horizon d and the top above the horizon d of described bottom is native
Layer；Described Metro station excavation 16-5 is divided into top foundation ditch and the bottom foundation ditch below the foundation ditch of described top, described top
Foundation ditch is located in described upper soil horizon；
Described top building enclosure includes two upper building enclosures being symmetrically laid in the described top foundation ditch left and right sides, institute
State building enclosure and include the upper cast-in-situ bored pile 16-6 that the many sidepiece excavation lines along described top foundation ditch are laid from front to back
It is supported in upper Guan Liang 16-7 on many described upper cast-in-situ bored pile 16-6 together, described upper Guan Liang 16-7 is reinforced concrete
Tu Liang, described upper Guan Liang 16-7 upper cast-in-situ bored pile 16-6 described with many pours and is integrated, and adjacent two described upper borings fill
It is fastenedly connected by upper reinforced concrete retaining wall between note stake 16-6；The structure of many described upper cast-in-situ bored pile 16-6
With size all same and it is all laid in same level, the bottom height of described upper cast-in-situ bored pile 16-6 is less than on described
The bottom level of portion's foundation ditch；
Described bottom foundation ditch is divided into foundation ditch and the lower foundation ditch below described upper foundation ditch, and described upper foundation ditch is located at described
In upper soil horizon, described lower foundation ditch is located in the horizon d of described bottom；The width of described top foundation ditch is more than described upper foundation ditch
Width, the width of described upper foundation ditch is more than the width of described lower foundation ditch；
Described middle part building enclosure includes two middle building enclosures being symmetrically laid in the described upper foundation ditch left and right sides, described
Middle building enclosure includes the lower cast-in-situ bored pile 16-8 and that the many sidepiece excavation lines along described upper foundation ditch are laid from front to back
Road is supported in lower Guan Liang 16-9 on many described lower cast-in-situ bored pile 16-8, and described lower Guan Liang 16-9 is reinforced beam,
Described lower Guan Liang 16-9 lower cast-in-situ bored pile 16-8 described with many pours and is integrated, adjacent two described lower cast-in-situ bored piles
It is fastenedly connected by lower reinforced concrete retaining wall between 16-8；The structure of many described lower cast-in-situ bored pile 16-8 and chi
Very little all same and its be all laid in same level, the bottom height of described lower cast-in-situ bored pile 16-8 is less than described upper foundation ditch
Bottom level；
Described bottom building enclosure includes two lower building enclosures being symmetrically laid in the described lower foundation ditch left and right sides, described
Lower building enclosure includes multiple tracks along the bottom anchor cable 16-10 that lays from front to back of sidepiece excavation line of described lower foundation ditch, multiple tracks institute
State that bottom anchor cable 16-10 is all laid on same plane and it is all laid in the upper outside of described lower foundation ditch, described bottom anchor
Rope 16-10 tilts from the inside to the outside gradually downward.
In the present embodiment, described upper building enclosure also includes cable bolting structure, and described upper cable bolting structure includes
Upper anchor cable group and the lower anchor cable group below described upper anchor cable group, described upper anchor cable group includes multiple tracks along described top foundation ditch
The upper anchor cable 16-11 that sidepiece excavation line is laid from front to back, upper anchor cable 16-11 described in multiple tracks is all laid on same plane and it
All it is laid in the upper outside of described top foundation ditch, described upper anchor cable 16-11 tilts from the inside to the outside gradually downward；Described lower anchor cable
Group includes multiple tracks along the lower anchor cable 16-12 that lays from front to back of sidepiece excavation line of described top foundation ditch, time anchor cable described in multiple tracks
16-12 is all laid on same plane and it is all laid in the lower outside of described top foundation ditch, and described lower anchor cable 16-12 is by interior
To tilting gradually downward outward.
Meanwhile, described middle building enclosure also includes stream line supporting construction, and described stream line supporting construction includes multiple tracks edge
The stream line 16-13 that the sidepiece excavation line of described upper foundation ditch is laid from front to back, stream line 16-13 described in multiple tracks are all laid in same
In one plane and it is all laid in the upper outside of described upper foundation ditch, described stream line 16-13 inclines from the inside to the outside gradually downward
Tiltedly.
In the present embodiment, described lower building enclosure also includes multiple anchor poles being from top to bottom laid in outside described lower foundation ditch
Group, each described anchor pole group all includes the anchor pole 14 that the many sidepiece excavation lines along described lower foundation ditch are laid from front to back, many
Described anchor pole 14 is all laid on same plane, and described anchor pole 14 tilts from the inside to the outside gradually downward.
In the present embodiment, described anchor pole 14 is in parallel laying with bottom anchor cable 16-10.
And, described upper anchor cable 16-11, lower anchor cable 16-12 and stream line 16-13 are in parallel all with bottom anchor cable 16-10
Lay.
In the present embodiment, the diameter of described upper cast-in-situ bored pile 16-6 is less than the diameter of lower cast-in-situ bored pile 16-8, described
A diameter of Φ 700mm～Φ 900mm of upper cast-in-situ bored pile 16-6, a diameter of Φ 900mm of described lower cast-in-situ bored pile 16-8
～Φ 1100mm.
In the present embodiment, described upper cast-in-situ bored pile 16-6 and lower cast-in-situ bored pile 16-8 is in be laid staggeredly.
And, the spacing between two neighboring described upper cast-in-situ bored pile 16-6 and two neighboring described lower cast-in-situ bored pile
Spacing between 16-8 is 1.5m～2.5mm.
During practice of construction, can according to specific needs, to the diameter of upper cast-in-situ bored pile 16-6 and lower cast-in-situ bored pile 16-8,
Between between the height of upper cast-in-situ bored pile 16-6 and lower cast-in-situ bored pile 16-8, two neighboring described upper cast-in-situ bored pile 16-6
Spacing between two neighboring described lower cast-in-situ bored pile 16-8 adjusts accordingly respectively.
In the present embodiment, the thickness of described upper reinforced concrete retaining wall and described lower reinforced concrete retaining wall is
80mm～120mm.
During practice of construction, can according to specific needs, to described upper reinforced concrete retaining wall and described lower armored concrete
The thickness of retaining wall adjusts accordingly.
In the present embodiment, spacing between the bottom of described upper cast-in-situ bored pile 16-6 and the bottom of described top foundation ditch with
And the spacing between the bottom of lower cast-in-situ bored pile 16-8 and the bottom of described upper foundation ditch is 1.5m～3.5m.
When carrying out filling concrete in step 3, it is irrigated from the bottom to top, be poured into the coagulation in described bottom segment
Soil enters bottoms stake holes section 10 through multiple described injected holes 11, and obtains construction and complete stake holes inner concrete structure 12.
In the present embodiment, described bottom segment is from top to bottom provided with multiple rows of shear bar 9, often arranges described shear bar 9 equal
Along the circumferential direction uniformly it is laid in the shear bar 9 on steel pipe support post 1 lateral wall including multiple tracks, described in multiple tracks, shear bar 9 is uniform
It is located in same level.
In the present embodiment, in described bottom horizon d 8, have the bottom stake holes section 10 for the insertion of described bottom segment, institute
State and multiple injected holes 11 are had on the side wall of bottom segment, be to be poured by concrete between described bottom segment and bottom horizon d 8
The stake holes inner concrete structure 12 built, multiple rows of described shear bar 9 all pours in stake holes inner concrete structure 12.
During practice of construction, multiple described injected holes 11 are in uniform laying, and multiple described injected hole 11 is in quincunx laying.
In the present embodiment, described upper stiffener includes upper connector and in vertically to the upper stiffener laid, described upper company
Fitting is L-shaped connector, and described upper connector is fixed on the lateral wall of steel pipe support post 1, and described upper stiffener is fixed on institute
State on upper connector, described upper stiffener is fixed on steel pipe support post 1 by described upper connector；Described lower stiffener includes
Lower connector and to the lower stiffener laid, described lower connector is L-shaped connector in vertically, described lower connector is fixed on steel
On the lateral wall of pipe support column 1, described lower stiffener is fixed on described lower connector, and described lower stiffener passes through described lower company
Fitting is fixed on steel pipe support post 1；Described upper stiffener and described lower stiffener are triangular plate.
In the present embodiment, described middle stiffener includes middle connector and in vertically to the middle stiffener laid, described middle company
Fitting is L-shaped connector, and described middle connector is fixed on the lateral wall of steel pipe support post 1, and described middle stiffener is fixed on institute
State on upper connector, described middle stiffener is fixed on steel pipe support post 1 by described middle connector；Open on described middle stiffener
There are multiple through holes.
Thus, described middle stiffener forms a PBL shear connector, strengthens shearing strength, effectively improves steel pipe support
Bonding strength between post 1 bottom and stake holes inner concrete structure 12.
For improving the bonding strength between steel pipe support post 1 bottom and stake holes inner concrete structure 12 further, described in
Zigzag is processed in the outside of stiffener.
In the present embodiment, described round tray 2 is weldingly fixed on steel pipe column 1.
As shown in Fig. 2 described round tray 2 include lower annular plate 2-1, be located at lower annular plate 2-1 directly over upper
Annular plate 2-2 and multiple support member 2-3 being supported between lower annular plate 2-1 and upper annular plate 2-2, multiple described
Support member 2-3 is along the circumferential direction uniformly laid, and described lower annular plate 2-1 and upper annular plate 2-2 are all in horizontal layout.
In the present embodiment, multiple described support member 2-3 are in vertically to the gripper shoe laid.
And, described gripper shoe is steel plate, described lower annular plate 2-1 and upper annular plate 2-2 is steel plate.
In the present embodiment, all with welding side between each described gripper shoe and lower annular plate 2-1 and upper annular plate 2-2
Formula is fixedly connected.
And, described lower annular plate 2-1 and upper annular plate 2-2 is all weldingly fixed on steel pipe column 1, each described
The medial wall of fagging is all weldingly fixed on steel pipe column 1.
During practice of construction, before described middle plate-girder 3 is constructed, first round tray 2 is fixed on steel pipe column 1.To steel
When node between tubing string 1 and middle plate-girder 3 is constructed, only need centering plate-girder 3 to be constructed, and make steel pipe column 1 therefrom plate-girder 3
The interior middle plate-girder 3 through, construction molding is located at below middle plate-girder 3.Thus, practice of construction is easy, to steel pipe column 1 and middle plate
When node between beam 3 is constructed, there is no any weld job, construction volume is little, easy construction, quick.
During actually used, by round ring boss 15-3 in order to dash and protection, the aperture of stake holes 15-1 can be entered
Row effective protection.
In the present embodiment, the sections that described vertical reinforcement 15-4 top stretches in round ring boss 15-3 is upper reinforcement
Sections, described upper reinforcement sections is L-shaped.
In the present embodiment, described in step 1011, the total height of cylindric ruggedized construction 15-2 and round ring boss 15-3 is
800mm～1200mm.
And, the wall thickness of described cylindrical shape ruggedized construction 15-2 is 80mm～120mm, the width of described round ring boss 15-3
Degree d1=180mm～220mm and its height h1=80mm～120mm.
During practice of construction, can according to specific needs, total height to cylindric ruggedized construction 15-2 and round ring boss 15-3
Degree, the cylindric wall thickness of ruggedized construction 15-2 and the width d1 of round ring boss 15-3 and height h1 are accordingly adjusted respectively
Whole.
In the present embodiment, described stake holes 15-1 is divided into top stake holes and the bottom stake holes below the stake holes of described top,
The stratum of construction area residing for constructed subway station is upper-soft lower-hard ground, and described upper-soft lower-hard ground includes bottom horizon d
With the upper soil horizon above the horizon d of described bottom；Described top stake holes is located in described upper soil horizon, the stake of described bottom
Hole position is in the horizon d of described bottom.
In the present embodiment, the stake holes sections being located at topmost in multiple described stake holes sections in step 1011 saves for top
Section, the dado structure 15-6 in described top segment is located at below cylindric ruggedized construction 15-2 and the two pours and is integrated.
Dado structure 15-6 in described top segment is divided into top dado structure and is just located at described top dado structure
Lower section bottom dado structure, the external diameter of described top dado structure be from top to bottom gradually reduced and its internal diameter from top to bottom gradually
Increase, the top outer diameter of described top dado structure is identical with the external diameter of cylindric ruggedized construction 15-2；Described bottom retaining wall knot
The external diameter of structure all same and its external diameter is identical with the bottom external diameter of described top dado structure from top to bottom, described bottom retaining wall is tied
The external diameter of structure is identical with the aperture of stake holes 15-1.
And, neighbouring two described dado structure 15-6 pour and are integrated, neighbouring two described dado structures
In 15-6, underlying dado structure 15-6 top stretches in dado structure 15-6 above and built-in length is
50mm～100mm.
In multiple described stake holes sections, all stake holes sections in addition to described top segment are lower stake holes sections, described
The structure of dado structure 15-6 and size all same in lower stake holes sections, the external diameter of dado structure 15-6 in the sections of lower pile hole
All same and its internal diameter is from top to bottom gradually reduced, the external diameter of dado structure 15-6 and stake in the sections of lower pile hole from top to bottom
The aperture of hole 15-1 is identical.
In the present embodiment, carry out in the follow-up digging process of top stake holes in step 1012, manually adopt pneumatic pick to excavate, excavate
Short drilling depth excavates, and strengthens protection.
And, the multiple described stake holes sections in the stake holes of described top is excavated respectively, described dado structure 15-6,
Using C20 monolithic reinforced concrete structure, thickness 15cm, horizontal direction every side in aperture is widened by 150mm, for preventing work progress
Middle dado structure 15-6 comes off, and described dado structure 15-6 is interior eight word overlap joints, and the lap of splice is not less than 10cm.
In the present embodiment, when carrying out filling concrete in step 3, the inside upper part of described steel pipe support post 1 is provided with steel
Muscle cage 14, described grouting pipe 13 is in vertically to laying and it is located at the middle inside of described stake holes, described grouting pipe 13 from
Steel reinforcement cage 14 middle inside passes through.
Described steel reinforcement cage 14 top stretches in top board, and steel reinforcement cage 14 and described top are passed through in steel pipe column top of the present invention
Plate pours and is integrated, and realizes being rigidly connected.
Before after the completion of steel pipe column lifting in step 2 and carrying out filling concrete in step 3, first will using hanging device
Steel reinforcement cage 14 lifts in steel pipe support post 1, refers to Fig. 4.
And, when carrying out filling concrete in step 3, method is left using high-altitude and is irrigated by grouting pipe 13,
Refer to Fig. 5.
Wherein, high-altitude leave method be also referred to as high throw no vibrated concrete method, that is, mixture be have very high mobility and
Do not isolate, not bleeding, realize flowing automatically using the kinetic energy that produces when throwing under eminence in casting process without vibrating or vibrate less
Put down and be full of the concrete of steel pipe column.
In the present embodiment, before from top to bottom the stake holes of described erection of steel pipe column being excavated in step one, first to institute
The installation position stating stake holes measures unwrapping wire；
Described stake holes is divided into top stake holes and the bottom stake holes below the stake holes of described top, and described top stake holes is located at
In described upper soil horizon, described bottom stake holes is located in the horizon d of described bottom；
When from top to bottom described stake holes being excavated in step one, first adopt manually from top to bottom to described top stake holes
Excavated, more from top to bottom described bottom stake holes is excavated using drilling and blasting method.
In the present embodiment, when described steel reinforcement cage 14 is carried out with colligation construction, smooth ground steel ring platform makes.
The fabricating quality of described steel reinforcement cage 14 has to comply with design and relevant code requirement, and distance of reinforcing bar have to be larger than coagulation
More than 3 times of native coarse aggregate size.Hoop of putting more energy into is located inside cage bar, and described steel reinforcement cage 14 is cylindric steel reinforcement cage and its internal diameter is answered
100mm more than bigger than external diameter at the catheter adapter of grouting pipe 13, the external diameter of described steel reinforcement cage 14 is less than the aperture of described stake holes
140mm.
Meanwhile, multiple spacer bar rings are from top to bottom set outside the cage bar of steel reinforcement cage 14, described in neighbouring two
The level interval of spacer bar ring is 2m, and the quantity of spacer bar ring is no less than at 4 and lays in uniform.Described steel reinforcement cage 14
Top arranges suspension ring.
In the present embodiment, when carrying out filling concrete in step 3, the concrete being irrigated is self-compacting concrete.
The Binder Materials of described self-compacting concrete include cement and mineral admixture, and cement should meet existing national standards
《Common portland cement》The regulation of GB175；When using other kind cement, its performance indications should meet the rule of respective standard
Fixed.Mineral admixture is flyash, ground granulated blast furnace slag, silicon ash etc., and its performance indications should meet national existing relevant criterion
Requirement.
The coarse aggregate of described self-compacting concrete adopts continuous grading or 2 and the collocation use of above one-stone grading,
Big nominal particle diameter is not more than 20mm.The flat-elongated particles content of coarse aggregate, clay content and clod content, should meet the requirement of table 1,
Other performances and test method should meet existing industry standard《Regular concrete sand, stone quality and test method standard》
Relevant regulations in JGJ52.
The performance indications table of table 1 coarse aggregate
| Project | Flat-elongated particles content | Clay content | Clod content |
| Index | ≤ 8% | ≤ 1.0% | ≤ 0.5% |
And gently coarse aggregate adopts continuous grading, performance indications should meet the requirement of table 2, and its performance and test method should meet
Existing national standards《Light-weight aggregate and its test method part 1：Light-weight aggregate》GB/T17431.1 and industry standard《Lightweight aggregate mixes
Solidifying soil technical regulation》Relevant regulations in JGJ51.
| Project | Density rating | Maximum particle diameter | Grain type coefficient | 24h water absorption rate |
| Index | ≥700 | ≤16mm | ≤2.0 | ≤ 10% |
Sand in fine aggregate selection, the clay content of natural sand, clod content answer conformance with standard code requirement.
The additive of described self-compacting concrete selects high-performance water reducing agent or high efficiency water reducing agent.Additive performance should meet
Existing national standards《Concrete admixture》GB8076 and《Technical code for application of admixture in concrete》Related rule in GB50119
Fixed.
When mixing other additives improving mix physical performance, should be by fully being verified, its performance should meet
The requirement of existing relevant criterion.
When mixing extender, its performance should meet existing national standards《Cement expansive material》Related rule in GB23439
Fixed
The self-compacting concrete mixing water of described self-compacting concrete, should meet existing industry standard《Concrete water
Standard》The relevant regulations of JGJ63.
According to requirement of engineering, when described self-compacting concrete adds steel fibre, synthetic fibers, its performance should meet existing
Industry standard《Fiber concrete application technology code》Relevant regulations in JGJ/T221.
Before carrying out filling concrete in step 3, first grouting pipe 13 is connected with grouting equipment, and with water to slip casting
Carry out conduit inside conduit 13.
Actual when carrying out concreting, concrete molding temperature is less than 35 DEG C；During winter construction, concrete enters mould temperature
Degree is not less than 5 DEG C.
In the present embodiment, when carrying out filling concrete in step 3, often perfusion 1m height, stops 16 seconds to 18 seconds, treats certainly
Air-free concrete is automatically closely knit, and the air of inside concrete is squeezed away, reaches the effect of concrete self-compaction.
In the present embodiment, described bottom segment is the anchoring section of described steel pipe column.
And, described steel pipe column is divided into anchoring section and is located at the top pile cutoff above described anchoring section.
In the present embodiment, when carrying out filling concrete in step 3, first filling concrete is carried out to described anchoring section, refer to
Fig. 5 and Fig. 6；After the completion for the treatment of described anchoring section inner concrete perfusion, and in 6h after the initial set of institute's concrete perfusion, to described top
Pile cutoff carries out filling concrete construction.During filling concrete, control filling concrete speed, and uniformly irrigated.
The above, be only presently preferred embodiments of the present invention, not the present invention imposed any restrictions, every according to the present invention
Any simple modification, change and equivalent structure change that technical spirit is made to above example, all still fall within skill of the present invention
In the protection domain of art scheme.
Claims (10)
1. a kind of upper-soft lower-hard ground Metro station excavation excavation construction process it is characterised in that：Constructed Metro station excavation
(16-5) medial support structures that middle inside is provided with, the building enclosure of constructed Metro station excavation (16-5) is included by upper
To lower top building enclosure, middle part building enclosure and the bottom building enclosure that Metro station excavation (16-5) is gone along with sb. to guard him, institute
Construction subway station residing for construction area stratum be upper-soft lower-hard ground, described upper-soft lower-hard ground include bottom horizon d and
Upper soil horizon above the horizon d of described bottom；Described Metro station excavation (16-5) is divided into top foundation ditch and is located at described
Bottom foundation ditch below the foundation ditch of top, described top foundation ditch is located in described upper soil horizon；
Described top building enclosure includes two upper building enclosures being symmetrically laid in the described top foundation ditch left and right sides, described on
Building enclosure include upper cast-in-situ bored pile (16-6) that the many sidepiece excavation lines along described top foundation ditch lay from front to back and
It is supported in the upper Guan Liang (16-7) on many described upper cast-in-situ bored piles (16-6) together, described upper Guan Liang (16-7) is mixed for reinforcing bar
Solidifying Tu Liang, described upper Guan Liang (16-7) upper cast-in-situ bored pile (16-6) described with many pours and is integrated, adjacent two described on
It is fastenedly connected by upper reinforced concrete retaining wall between cast-in-situ bored pile (16-6)；Many described upper cast-in-situ bored piles
(16-6) structure and size all same and its be all laid in same level, the bottom of described upper cast-in-situ bored pile (16-6)
Highly it is less than the bottom level of described top foundation ditch；
Described bottom foundation ditch is divided into foundation ditch and the lower foundation ditch below described upper foundation ditch, and described upper foundation ditch is located at described top
In soil layer, described lower foundation ditch is located in the horizon d of described bottom；The width of described top foundation ditch is more than the width of described upper foundation ditch,
The width of described upper foundation ditch is more than the width of described lower foundation ditch；
Described middle part building enclosure includes two middle building enclosures being symmetrically laid in the described upper foundation ditch left and right sides, described in enclose
Protection structure includes lower cast-in-situ bored pile (16-8) that the many sidepiece excavation lines along described upper foundation ditch lay from front to back and together
It is supported in the lower Guan Liang (16-9) on many described lower cast-in-situ bored piles (16-8), described lower Guan Liang (16-9) is armored concrete
Beam, described lower Guan Liang (16-9) lower cast-in-situ bored pile (16-8) described with many pours and is integrated, adjacent two described lower borings
It is fastenedly connected by lower reinforced concrete retaining wall between bored concrete pile (16-8)；Many described lower cast-in-situ bored piles (16-8)
Structure and size all same and its be all laid in same level, the bottom of described lower cast-in-situ bored pile (16-8) is highly low
Bottom level in described upper foundation ditch；
Described bottom building enclosure includes two lower building enclosures being symmetrically laid in the described lower foundation ditch left and right sides, described under enclose
Protection structure includes multiple tracks along the bottom anchor cable (16-10) laid from front to back of sidepiece excavation line of described lower foundation ditch, described in multiple tracks
Bottom anchor cable (16-10) is all laid on same plane and it is all laid in the upper outside of described lower foundation ditch, described bottom anchor
Rope (16-10) tilts from the inside to the outside gradually downward；
Described medial support structures include multiple caissons, and multiple described caissons are long along the longitudinal direction of Metro station excavation (16-5)
Degree direction is laid from front to back, and multiple described caisson is in all vertical to laying；Described caisson is concrete filled steel tube
Stake, a diameter of Φ 550mm～Φ 650mm of described steel tube concrete pile；Described steel tube concrete pile is included positioned at institute construction ground
Steel pipe support post (1) in ferrum station, the interior joint being laid in the middle part of steel pipe support post (1) construct and are laid in steel pipe support post
(1) the lower node construction of bottom, described steel pipe support post (1) is in vertically to laying；The agent structure bag of constructed subway station
Include base plate (4), two side walls being laid in respectively above base plate (4) left and right sides, the top boards and directly over base plate (4)
The individual middle plate being laid between described top board and base plate (4), the left and right sides of described base plate (4), described top board and described middle plate
All connect as one with described side wall；The top and the bottom of described steel pipe support post (1) are separately fixed at described top board and base plate (4)
On, it is provided with the middle plate-girder (3) in horizontal layout in described middle plate, described middle plate-girder (3) is horizontal along constructed subway station
Width is laid, and described base plate (4), described middle plate and middle plate-girder (3) are reinforced concrete structure；Described interior joint
Construction includes round tray (2) on steel pipe support post (1) for the coaxial package, and described round tray (2) is in horizontal layout, described
Middle plate-girder (3) is supported on round tray (2), and described round tray (2) is located at below middle plate-girder (3), described round tray (2)
It is installed on steel pipe support post (1), described steel pipe support post (1) therefrom passes through in plate-girder (3)；Described lower node construction include by
The up to lower upper reinforcing structure (5) laid, middle reinforcing structure (6) and lower reinforcing structure (7), described upper reinforcing structure (5) and under
Reinforcing structure (7) is symmetrically laid, described upper reinforcing structure (5), middle reinforcing structure (6) and lower reinforcing structure (7) all pour in
In base plate (4)；Described upper reinforcing structure (5) includes multiple being along the circumferential direction uniformly laid on steel pipe support post (1) lateral wall
Upper stiffener, multiple described upper stiffeners are all laid in same level；Described middle reinforcing structure (6) includes multiple edges circle
Circumferential direction is uniformly laid in the middle stiffener on steel pipe support post (1) lateral wall, and multiple described middle stiffeners are all laid in same
On horizontal plane；Described lower reinforcing structure (7) includes multiple being along the circumferential direction uniformly laid on steel pipe support post (1) lateral wall
Lower stiffener, multiple described lower stiffeners are all laid in same level；
When excavation construction is carried out to Metro station excavation (16-5), comprise the following steps：
Step A, medial support structures and top building enclosure synchronous construction：Described medial support structures and described top are gone along with sb. to guard him
Structure is constructed respectively；
Wherein, when described medial support structures being constructed, from front to back to multiple described in described medial support structures
Caisson is constructed respectively, the construction method all same of multiple described drilled piles；
To when any one described, drilled pile is constructed, process is as follows：
Step one, pore digging：From top to bottom the stake holes to constructed caisson (15-1) is excavated, described stake holes (15-1)
It is divided into top stake holes and the bottom stake holes below the stake holes of described top, described top stake holes is located in described upper soil horizon,
Described bottom stake holes is located in the horizon d of described bottom；When described stake holes (15-1) is excavated, process is as follows：
Step 101, top pore digging：Using manually from top to bottom excavating to described top stake holes, comprise the following steps：
Step 1011, aperture are excavated and locking notch structure construction：Excavated in the aperture section of described top stake holes, and excavated into
Construction locking notch structure in the described aperture section of type；
Described locking notch structure includes the cylindric ruggedized construction (15-2) in the aperture of stake holes (15-1) and is laid in circle
Round ring boss (15-3) in tubular ruggedized construction (15-2), described cylindrical shape ruggedized construction (15-2) and round ring boss
(15-3) it is reinforced concrete structure and the two pours and is integrated；Described cylindrical shape ruggedized construction (15-2) is in vertically to cloth
If described round ring boss (15-3) and cylindric ruggedized construction (15-2) are in coaxial laying, and round ring boss (15-3) is in
Horizontal layout and it is located at the surface of cylindric ruggedized construction (15-2)；The internal diameter of described round ring boss (15-3) and cylinder
The internal diameter of shape ruggedized construction (15-2) is identical, and the external diameter of described round ring boss (15-3) is more than cylindric ruggedized construction (15-2)
External diameter；Described stake holes (15-1) is located at the caisson stake holes being laid in constructed subway station middle inside, described stake holes
(15-1) aperture is Φ 2m～Φ 3m and its aperture is identical with the diameter of described caisson, described round ring boss (15-3)
Internal diameter is less than the aperture of stake holes (15-1) and its external diameter is more than the aperture of stake holes (15-1)；Described cylindrical shape ruggedized construction (15-2)
The length extending out to ground is 20cm～50cm, is provided with cylindric steel reinforcement cage, institute in described cylindrical shape ruggedized construction (15-2)
State cylindric steel reinforcement cage and include multiple tracks and be along the circumferential direction uniformly laid in vertical reinforcement (15-4) and multiple tracks in same level
The ring-shaped stirrup (15-5) from top to bottom laid, ring-shaped stirrup (15-5) described in multiple tracks all in level to laying, perpendicular described in multiple tracks
It is fastenedly connected by ring-shaped stirrup (15-5) described in multiple tracks to reinforcing bar (15-4) and be integrated；Vertical reinforcement described in per pass (15-4)
Top all stretches in round ring boss (15-3)；
Described top stake holes is from top to bottom divided into multiple stake holes sections, and the length of described stake holes sections is 500mm～1000mm, often
It is provided with dado structure (15-6), described dado structure (15-6) is xoncrete structure in individual described stake holes sections；Multiple institutes
Stating the stake holes sections positioned at topmost in stake holes sections is top segment, and the dado structure (15-6) in described top segment is located at
Below cylindric ruggedized construction (15-2) and the two pours and is integrated；The aperture of described stake holes (15-1) be Φ 2m～Φ 3m and its
In vertically to laying；
Step 1012, top stake holes are subsequently excavated：From top to bottom to the multiple described stake holes sections in the stake holes of described top respectively
Excavated；Often excavate and complete a described stake holes sections, dado structure of all constructing in the described stake holes sections excavating molding
(15-6)；After the completion for the treatment of dado structure (15-6) construction in a described stake holes sections, then to next described stake holes section
Duan Jinhang excavates；
Step 2, steel pipe column lifting：Described steel pipe column is from top to bottom lifted in stake holes described in step one (15-1), and makes
Described steel pipe column is located at the middle inside of described stake holes (15-1)；
Step 3, filling concrete：By grouting pipe (13) to the interior concrete perfusion of steel pipe support post (1)；Wait to be irrigated and mix
After solidifying soil solidification, obtain the caisson that construction completes；
Step B, top excavation of foundation pit：From top to bottom described top foundation ditch is excavated；
Step C, the construction of middle part building enclosure：Described middle part building enclosure is constructed；
Step D, upper excavation of foundation pit：From top to bottom described upper foundation ditch is excavated；
Step E, lower excavation of foundation pit：Using Blasting Excavation mode, described lower foundation ditch is excavated, described lower Excavation Process
In, from top to bottom described bottom building enclosure is constructed.
2. according to the upper-soft lower-hard ground Metro station excavation excavation construction process described in claim 1 it is characterised in that：Described
Upper building enclosure also includes cable bolting structure, and described upper cable bolting structure includes anchor cable group and is located at described upper anchor cable
The lower anchor cable group of group lower section, described upper anchor cable group includes multiple tracks and lays from front to back along the sidepiece excavation line of described top foundation ditch
Upper anchor cable (16-11), upper anchor cable (16-11) described in multiple tracks is all laid on same plane and it is all laid in described top foundation ditch
Upper outside, described upper anchor cable (16-11) tilts from the inside to the outside gradually downward；Described lower anchor cable group includes multiple tracks along on described
The lower anchor cable (16-12) that the sidepiece excavation line of portion's foundation ditch is laid from front to back, lower anchor cable (16-12) described in multiple tracks is all laid in same
In one plane and it is all laid in the lower outside of described top foundation ditch, described lower anchor cable (16-12) is from the inside to the outside gradually downward
Tilt；
Described middle building enclosure also includes stream line supporting construction, and described stream line supporting construction includes multiple tracks along described upper foundation ditch
The stream line (16-13) laid from front to back of sidepiece excavation line, described in multiple tracks, stream line (16-13) is all laid in same plane
Go up and it is all laid in the upper outside of described upper foundation ditch, described stream line (16-13) tilts from the inside to the outside gradually downward；
When described middle part building enclosure being constructed in step A, to the upper cast-in-situ bored pile (16- in described upper building enclosure
6) constructed with upper Guan Liang (16-7)；
Carry out in step B in the Excavation Process of top, from top to bottom to the described upper reinforced concrete in described upper building enclosure
Native retaining wall and described upper cable bolting structure are constructed respectively；
When carrying out middle part building enclosure construction in step C, to the lower cast-in-situ bored pile (16-8) in the building enclosure of described middle part and
Lower Guan Liang (16-9) is constructed；
Carry out in step D in upper Excavation Process, from top to bottom the described lower armored concrete in the building enclosure of described middle part
Retaining wall and described stream line supporting construction are constructed respectively.
3. according to the upper-soft lower-hard ground Metro station excavation excavation construction process described in claim 1 or 2 it is characterised in that：
Described steel pipe support post (1) bottom stretches in the bottom horizon d (8) below base plate (4), described steel pipe support post (1) bottom
Stretch to the bottom segment in bottom horizon d (8), the length of described bottom segment is 2.5m～3.5m；
Bottom stake holes section (10) for the insertion of described bottom segment is had in described bottom horizon d (8), described bottom segment
Multiple injected holes (11) are had on the wall of side, is formed by concreting between described bottom segment and bottom horizon d (8)
Stake holes inner concrete structure (12), multiple rows of described shear bar (9) all pours in stake holes inner concrete structure (12)；Described stake holes
(15-1) being located at the sections below base plate (4) in is bottom stake holes section (10)；
When carrying out filling concrete in step 3, it is irrigated from the bottom to top, be poured into the concrete warp in described bottom segment
Multiple described injected holes (11) enter bottom stake holes section (10), and obtain construction and complete stake holes inner concrete structure (12).
4. according to the upper-soft lower-hard ground Metro station excavation excavation construction process described in claim 1 or 2 it is characterised in that：
When carrying out filling concrete in step 3, the concrete being irrigated is self-compacting concrete.
5. according to the upper-soft lower-hard ground Metro station excavation excavation construction process described in claim 1 or 2 it is characterised in that：
The inside upper part of described steel pipe support post (1) is provided with steel reinforcement cage (14), described grouting pipe (13) be in vertically to lay and its
Positioned at the middle inside of described stake holes (15-1), described grouting pipe (13) passes through from steel reinforcement cage (14) middle inside；
When carrying out filling concrete in step 3, method is left using high-altitude and is irrigated by grouting pipe (13).
6. according to the upper-soft lower-hard ground Metro station excavation excavation construction process described in claim 1 or 2 it is characterised in that：
Described in step 1011, the total height of cylindric ruggedized construction (15-2) and round ring boss (15-3) is 800mm～1200mm；
The wall thickness of described cylindrical shape ruggedized construction (15-2) is 80mm～120mm, the width d1 of described round ring boss (15-3)
=180mm～220mm and its height h1=80mm～120mm.
7. according to the upper-soft lower-hard ground Metro station excavation excavation construction process described in claim 1 or 2 it is characterised in that：
The stake holes sections being located at topmost in multiple described stake holes sections in step 1011 is top segment, the shield in described top segment
Wall construction (15-6) is located at below cylindric ruggedized construction (15-2) and the two pours and is integrated；
Dado structure (15-6) in described top segment be divided into top dado structure and be located at described top dado structure just under
The bottom dado structure of side, the external diameter of described top dado structure is from top to bottom gradually reduced and its internal diameter from top to bottom gradually increases
Greatly, the top outer diameter of described top dado structure is identical with the external diameter of cylindric ruggedized construction (15-2)；Described bottom retaining wall knot
The external diameter of structure all same and its external diameter is identical with the bottom external diameter of described top dado structure from top to bottom, described bottom retaining wall is tied
The external diameter of structure is identical with the aperture of stake holes (15-1).
8. according to the upper-soft lower-hard ground Metro station excavation excavation construction process described in claim 1 or 2 it is characterised in that：
Neighbouring two described dado structures (15-6) pour and are integrated, and are located in neighbouring two described dado structures (15-6)
Dado structure (15-6) top of lower section stretch in dado structure (15-6) above and built-in length be 50mm～
100mm；
In multiple described stake holes sections, all stake holes sections in addition to described top segment are lower stake holes sections, lower pile hole
The structure of dado structure (15-6) and size all same in sections, in the sections of lower pile hole the external diameter of dado structure (15-6) by
Up to descend all same and its internal diameter is from top to bottom gradually reduced, the external diameter of dado structure (15-6) and stake in the sections of lower pile hole
The aperture in hole (15-1) is identical.
9. according to the upper-soft lower-hard ground Metro station excavation excavation construction process described in claim 1 or 2 it is characterised in that：
Multiple rows of shear bar (9) is from top to bottom provided with described bottom segment, often arranges described shear bar (9) and all include multiple tracks circumferentially side
To the shear bar (9) being uniformly laid on steel pipe support post (1) lateral wall, described in multiple tracks, shear bar (9) is all laid in same water
In plane.
10. according to the upper-soft lower-hard ground Metro station excavation excavation construction process described in claim 1 or 2 it is characterised in that：
Described round tray (2) includes lower annular plate (2-1), the upper annular plate (2-2) directly over lower annular plate (2-1)
And the multiple support member (2-3) being supported between lower annular plate (2-1) and upper annular plate (2-2), multiple described support members
(2-3) along the circumferential direction uniformly lay, described lower annular plate (2-1) and upper annular plate (2-2) are all in horizontal layout.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604924A (en) * | 2017-07-27 | 2018-01-19 | 上海市政工程设计研究总院（集团）有限公司 | A kind of construction method of bridge bearing platform excavation of foundation pit protection subway |
| CN109487798A (en) * | 2018-12-29 | 2019-03-19 | 中交（广州）建设有限公司 | Station asymmetry excavation supporting structure and construction technology |
| CN113737857A (en) * | 2021-10-09 | 2021-12-03 | 中国建筑第二工程局有限公司 | Be used for deep pipe gallery structure and major structure to build connection structure again and worker's method thereof |
-
2016
- 2016-08-31 CN CN201610795771.3A patent/CN106381874B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604924A (en) * | 2017-07-27 | 2018-01-19 | 上海市政工程设计研究总院（集团）有限公司 | A kind of construction method of bridge bearing platform excavation of foundation pit protection subway |
| CN109487798A (en) * | 2018-12-29 | 2019-03-19 | 中交（广州）建设有限公司 | Station asymmetry excavation supporting structure and construction technology |
| CN109487798B (en) * | 2018-12-29 | 2024-03-22 | 中交（广州）建设有限公司 | Asymmetric excavation construction process for station |
| CN113737857A (en) * | 2021-10-09 | 2021-12-03 | 中国建筑第二工程局有限公司 | Be used for deep pipe gallery structure and major structure to build connection structure again and worker's method thereof |
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