CN106869172B - In-situ deposited prefabricated split-mounting type subway underground station construction method - Google Patents
In-situ deposited prefabricated split-mounting type subway underground station construction method Download PDFInfo
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- CN106869172B CN106869172B CN201710213504.5A CN201710213504A CN106869172B CN 106869172 B CN106869172 B CN 106869172B CN 201710213504 A CN201710213504 A CN 201710213504A CN 106869172 B CN106869172 B CN 106869172B
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- side wall
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- superimposed sheet
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- 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
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
Abstract
The invention discloses a kind of in-situ deposited prefabricated split-mounting type subway underground station construction methods, in its foundation pit constructed after the completion of excavation of subway foundation pit supporting, Step 1: baseplate reinforcing bar to be placed in the bottom of foundation pit, corresponded on the baseplate reinforcing bar and be provided with dowel at bottom column and bottom side wall, after-pouring underplate concrete；Step 2: bottom column and the construction of bottom side wall；Step 3: middle plate construction；Step 4: repeating step 2 and step 3, the superstructure construction of subway underground station is completed, backfill earthing is carried out to top plate of subway foundation pit or more later；Wherein, top plate is superimposed sheet, and reinforcing bar is equipped in top plate, two ends reserved steel bar as required.The present invention realizes the industrial streamlined production of subway underground station structure major part structure.
Description
Technical field
The present invention relates to subway underground stations to build technical field of construction.It is more particularly related to a kind of cast-in-place
Precast assembly combined type subway underground station construction method.
Background technique
The excavation method of subway underground station mainly includes cut and cover method, cap excavation method, shallow burial hidden digging.Various excavation methods
When being related to the construction of subway underground station structure, the structures such as side wall, column, bottom plate, middle plate, top plate of station structure are often adopted
With live formwork supporting plate, poured in place concrete, job-cured method.This cast-in-place construction method have good integrity, just
The advantages that degree is big, antidetonation impact is good.But it requires to exist clearly for adapting to construction site scheduling and green construction
The drawbacks of.A large amount of template is not only needed, but also the workload at scene is big, the duration is also longer.Cast-in-place wet construction will also result in ring
Border water pollution, noise pollution and air pollution.Compared to traditional cast-in-place construction, the construction of precast assembly combined type then have than
Obvious advantage.The component of subway underground station includes that middle plate, beam, side wall superimposed sheet, top plate superimposed sheet and column etc. can be with
It first makes in factory or precasting yard, is then installed at the construction field (site).Connector reinforcing bar is reserved while prefabricated, after convenient
It is continuous to carry out the cast-in-place connection formation entirety in joint at the scene.In addition, being filled to these prefabricated components in factory or precasting yard
Decorations, can further shorten the construction time.A large amount of templates can be saved using precast assembly combined type form of construction work, improve construction
Condition is raised labour productivity, and is accelerated construction progress.The discharge amount and noise pollution degree of building waste are also lower than traditional handicraft
Very much, the standard of modern architecture and the requirement of green construction are more in line with.And the precast assembly group of current subway underground station
It closes construction and utilization is not yet received.Based on this, in-situ deposited prefabricated split-mounting type subway underground station construction method is proposed.
Summary of the invention
It is an object of the invention to solve at least the above problems, and provide the advantages of at least will be described later.
It is a still further object of the present invention to provide a kind of in-situ deposited prefabricated split-mounting type subway underground station construction methods, real
The industrial streamlined production of subway underground station structure major part structure is showed.
In order to realize these purposes and other advantages according to the present invention, with providing a kind of in-situ deposited prefabricated split-mounting type
Iron underground station construction method, construction is in the foundation pit after the completion of excavation of subway foundation pit supporting, comprising the following steps:
Step 1: construction of bottom plates: baseplate reinforcing bar is placed in the bottom of foundation pit, corresponded on the baseplate reinforcing bar bottom column and
Be provided with dowel at bottom side wall, after-pouring underplate concrete, met the requirements to underplate concrete intensity, remove bottom
Foundation pit support；
Step 2: bottom column and the construction of bottom side wall:
The upper end of prefabricated side wall superimposed sheet reserves dowel, and lower end is provided with grout sleeve, and prefabricated side wall is folded
The inside wall of plywood is provided with side reinforcing bar, and the upper end of prefabricated pile reserves dowel, grout sleeve is arranged in lower end；It first will be prefabricated
The side reinforcing bar of side wall superimposed sheet is connected with corresponding bottom plate dowel, then erecting side wall superimposed sheet and prefabricated pile, specifically
For, corresponding with the bottom plate dowel of the grout sleeve of prefabricated side wall superimposed sheet and prefabricated pile is connected respectively, to junction and
Gap between prefabricated side wall superimposed sheet and foundation pit enclosure structure is by grout sleeve casting concrete, so that bottom column, bottom
Layer side wall, bottom plate and foundation pit enclosure structure form entirety, and conserve to intensity and meet the requirements；
Step 3: the construction of middle plate: overlap prefabricated stringer in the reinforcing bar on bottom column, connecting contiguous prefabricated stringer end,
And the connector of prefabricated stringer is poured, after concrete strength is met the requirements after joint, set up prefabricated middle plate, the prefabricated middle plate tool
Have the dowel being connect with bottom side wall, the dowel being connect with contiguous prefabricated middle plate and and upper one layer of column connection company
Connect muscle；To prefabricated middle plate and bottom side wall junction, contiguous prefabricated middle plate junction casting concrete, maintenance to intensity satisfaction is wanted
It asks, removes the foundation pit support in middle layer；
Step 4: repeating step 2 and step 3, the superstructure construction of subway underground station is completed, it is iron-based over the ground later
The top plate in hole or more carries out backfill earthing；Wherein, top plate is superimposed sheet, and reinforcing bar is equipped in top plate, and two ends are by wanting
Seek reserved steel bar.
Preferably, further include waterproof construction:
Before baseplate reinforcing bar erection, the entire bottom surface of first laying water-proof coiled material covering bottom plate, and the length of waterproof roll two sides
Degree is left to the top for extending to side wall in advance, and height of side wall includes the height of bottom side wall and upper layer side wall；
The vertical pre-embedded steel slab sealing of length direction after baseplate reinforcing bar erection, in the junction of bottom plate side wall and bottom plate
Band pours underplate concrete again later.
Preferably, the upper end of the bottom column and the upper end of bottom side wall all have bracket.
Preferably,
Circular column leg, and circle are respectively and fixedly provided in the middle part of the middle part and prefabricated pile lower end of the prefabricated side wall superimposed sheet lower end
Column leg is slightly longer than grout sleeve, to support prefabricated side wall superimposed sheet and prefabricated pile.
It preferably, further include multiple support rods, Specific construction step are as follows:
When the dowel connection corresponding with bottom plate of the grout sleeve of prefabricated side wall superimposed sheet and prefabricated pile in step 2, and
After circular column leg supports prefabricated side wall superimposed sheet and prefabricated pile, the support rod is obliquely installed, and passes through fixing piece and prefabricated side wall
Superimposed sheet, prefabricated pile and bottom plate are fixed, and remove support rod again after the completion of the construction of middle plate.
Preferably, when the position of plate in erection and top plate encounters prop, the middle plate and top plate and interim
The infall of pillar is reserved with gap, and in the reserved connection reinforcing bar of opening position, after prop dismounting, connects adjacent middle plate and slit
Reinforcing bar is connected at mouthful and adjacent top plate opening position connects reinforcing bar, and casting concrete.
Preferably, junction pours specifically, junction is first divided into inner ring and outer rings, and outer annular diameter is inner ring
1~3 times of diameter after inner ring concrete initial set, takes inner ring template away in inner ring formwork, and in inner ring casting concrete, it
Afterwards in outer ring formwork, the first fiberglass gridding cloth is fixed in the circle of outer Monday of inner ring concrete, later from outer ring formwork to the
The direction of one fiberglass gridding cloth tilts down 30 °~60 ° cricoid second fiberglass gridding cloths of setting, and in outer ring by
Up to multiple second fiberglass gridding cloths are arranged with, the spacing of adjacent second fiberglass gridding cloth is 8~10cm, later
The casting concrete in outer ring formwork.
The present invention is include at least the following beneficial effects:
1, the present invention is by in-situ deposited prefabricated assembling and construction method, has saved column, and middle plate underground station structure of awaiting a subway is mixed
The curing time of soil is coagulated, the superimposed sheet and prefabricated pile of this external wall can decorate its surface during prefabricated,
It avoids subway underground station structure construction individually to be fitted up on a large scale again after the completion, the finishing time is greatly saved, because
This present invention can significantly improve the build efficiency of subway underground station, accelerate construction speed, so reduce pair
The time that road traffic influences；
2, the present invention relates to the prefabricated of component, when on a large scale using this construction method, it can reach and reduce duration, machine
Toolization substitutes artificial site operation, and reduces the use of template, steel pipe, brings apparent economic benefit；
3, the present invention reduces cast-in-place wet work largely using prefabricated components instead of original cast-in-place structural, because
And reducing many side walls, the support shuttering of middle plate etc., common noise, dust, sawdust etc. largely reduce in subway work, ground
Construction space and construction environment in iron underground station are greatly improved；
4, the present invention largely uses the prefabricated components produced in precasting yard, and prefabricated components are in factory or precasting yard
Unified in mechanical assembly line to generate manufacture, control precision is high, has better quality compared to cast-in-place structural.Furthermore prefabricated components
Adverse effect by season is small, therefore the present invention can promote subway underground station structure construction quality on the whole.
Construction method of the invention realizes the industrial streamlined production of subway underground station structure (middle plate, column etc.),
Sectional, in conjunction with national industrial policies, energy-saving and emission-reduction, so that subway underground station architecture quality has better guarantee,
Adapt to the rapid assembling combination construction in scene.Due to using prefabricated component, prefabrication synchronous can be carried out with site operation,
Especially factory greatly shortens curing period, is obviously improved construction speed, shortens the construction period, and reduces the influence of road pavement traffic.Simultaneously
Due to the prefabricated quality that can guarantee component, the invention is securely and reliably economical, and construction risk is small.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of foundation pit after the completion of excavation of subway foundation pit supporting of the present invention；
Fig. 2 is construction of bottom plates schematic diagram of the present invention；
Fig. 3 is bottom column of the present invention and bottom side wall construction schematic diagram；
Fig. 4 is the structural schematic diagram of support rod temporary support of the present invention；
Fig. 5 is that grillage sets schematic diagram in the present invention；
Fig. 6 is the schematic diagram that plate and bottom column and bottom side wall pour connection in the present invention；
Fig. 7 is upper layer column of the present invention and upper layer side wall construction schematic diagram；
Fig. 8 is that upper layer column of the present invention and upper layer side wall complete the schematic diagram after pouring；
Fig. 9 is the schematic diagram of top plate beam of the present invention, template erection；
Figure 10 is that the present invention pours top plate, the schematic diagram of the rear foundation pit support for removing top layer；
Figure 11 is the structural schematic diagram of the subway underground station after present invention backfill earthing；
Figure 12 is the structural schematic diagram of subway underground station construction at prop；
Figure 13 is the longitudinal spliced schematic diagram of the middle plate with gap；
Figure 14 is that adjacent middle plate opening position connection reinforcing bar connects and completes the structural schematic diagram after pouring.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text
Word can be implemented accordingly.
In the description of the present invention, term " transverse direction ", " longitudinal direction ", "upper", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on the figure or position
Relationship is set, is merely for convenience of description of the present invention and simplification of the description, is not that device or the element of indication or suggestion meaning are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.
Such as Fig. 1-11, the present invention provides a kind of in-situ deposited prefabricated split-mounting type subway underground station construction method, such as Fig. 1 institute
Show, in the foundation pit constructed after the completion of excavation of subway foundation pit supporting, foundation pit includes armored concrete crown beam 1, enclosure wall 2, branch
The foundation pit support of foundation pit support 5 with bottom from the bottom to top, the foundation pit support 4 in middle layer and top layer in foundation pit after the completion of shield
3；
Construction method the following steps are included:
As shown in Fig. 2, Step 1: bottom plate 7 is constructed: foundation pit will be placed according to the baseplate reinforcing bar of construction requirement and specification binding
Bottom, corresponded to according to detailing requiments on the baseplate reinforcing bar and be provided with dowel 6 at bottom column and bottom side wall, poured later
Underplate concrete is built, is met the requirements to underplate concrete intensity, the foundation pit support of bottom, due in the technical program, side are removed
Wall uses prefabricated+cast-in-place form, therefore to the fixing by gross bearings for the dowel for corresponding to side wall on bottom plate compared to having directlyed adopt
Complete prefabricated side wall precision prescribed wants low, reduces difficulty of construction, needs between prior art insole board and prefabricated side wall
Side is set and leads wall connection, while the construction error for leading dowel in wall requires control within ± 4mm, and the application, due to side
Wall is cast-in-place using superimposed sheet and part, can be adjusted according to actual dowel location-appropriate, therefore construction error requires control
Within ± 10mm, the construction time is saved instead compared to the prior art.Pre- embedded reinforcing bar conduct in prefabricated superimposed sheet
On the other hand the bending resistance shearing strength of superimposed sheet can be improved up to 300% or more in subsequent side reinforcing bar, therefore superimposed sheet is from intensity
Meet the condition as side wall template；The construction method of cast-in-place+prefabricated side wall only needs prefabricated to side wall folded in the construction process
Plywood is lifted, positioned and is fixed temporarily, relatively entire precast wall body.The prefabricated superimposed sheet scale of construction is smaller, hangs to loop wheel machine
Dress Capability Requirement can reduce up to 50% or so；Simultaneously as the relatively complete prefabricated side wall of quality gently about 80% or so, prefabricated overlapping
Requirement of the plate to temporary support intensity and quantity is much lower, can totally reduce by about 80% temporary support component；Using it is prefabricated+
Cast-in-place construction scheme, waterproof roll can be laid in wall in advance, carry out afterwards it is cast-in-place, by waterproof roll be embedded to side wall in, can protect
Protect waterproof roll damage.
In addition, side wall is using cast-in-place+prefabricated: prefabricated superimposed sheet therein can replace the effect of template, avoid construction existing
The extensive formwork in field.And it is also inevitable in the cast-in-place concrete of joint itself of side wall and middle plate etc., therefore side wall uses
Part is cast-in-place not to will cause additional equipment increase etc..
As shown in Figure 3-4, Step 2: bottom column and the construction of bottom side wall: the upper end of prefabricated side wall superimposed sheet 8 is reserved
Dowel, lower end is provided with grout sleeve, and the inside wall of prefabricated side wall superimposed sheet is (close to the one of foundation pit enclosure structure
Face) it is provided with side reinforcing bar and prefabricated side wall superimposed sheet is extended in lower end, (axial bearing capacity of prefabricated pile is more live existing for prefabricated pile 10
Column is poured to improve up to 20% or more) upper end reserve dowel, lower end setting grout sleeve；First by prefabricated side wall superimposed sheet
Side reinforcing bar connected with corresponding bottom plate dowel, such as can be connected by screw shell, then erecting side wall overlaps
Plate and prefabricated pile, specifically, respectively connecting the grout sleeve of prefabricated side wall superimposed sheet and prefabricated pile dowel corresponding with bottom plate
It connects, grout sleeve casting concrete is passed through to the gap between junction and prefabricated side wall superimposed sheet and foundation pit enclosure structure,
So that bottom column, bottom side wall 11, bottom plate and foundation pit enclosure structure form entirety, and conserves to intensity and meet the requirements；Its
In, face when prefabricated side wall superimposed sheet pours using enclosure wall 2 as template saves template consumption, 12 be existing in figure
Pour column plate connector.
As seen in figs. 5-6, Step 3: middle plate is constructed: overlapping prefabricated stringer 14, (prefabricated stringer designs are up big and down small ladder
Shape structure) on bottom column, connecting the reinforcing bar of contiguous prefabricated stringer end, and the connector of prefabricated stringer is poured, to joint
After concrete strength is met the requirements, prefabricated middle plate 13 is set up later, and the prefabricated middle plate has the connection connecting with bottom side wall
Muscle, the dowel being connect with contiguous prefabricated middle plate and the dowel connected with upper layer column；To prefabricated middle plate and bottom side wall
Junction, contiguous prefabricated middle plate junction casting concrete, maintenance are met the requirements to intensity, remove the foundation pit support in middle layer.?
In above-mentioned technical proposal, middle plate is used as a load-carrying member in subway station, and precast concrete quality is stablized, entire
Life cycle effect on environment is minimum；The production quality of prefabricated board is secure, and bending resistance is improved compared with condition of equivalent thickness Bars In Poured Concrete Slab
20% or more.Therefore, under the premise of meeting same bearing capacity, prefabricated board can be made relatively more thinner.
As Figure 7-8, Step 4: upper layer column and the construction of upper layer side wall: setting up upper layer side wall superimposed sheet using loop wheel machine
And the prefabricated pile on upper layer, the upper end of same upper layer side wall superimposed sheet reserve dowel, lower end is provided with grout sleeve,
And the inside wall of upper layer side wall superimposed sheet is provided with side reinforcing bar；The upper end of the prefabricated pile on upper layer reserves dowel, lower end
Grout sleeve is set；Prefabricated pile can similarly be repaired in construction advance luggage, to save the duration.Later with the erection in step 2
Connection type is identical, and with each junction of plate in concreting upper layer side wall and subway station structure.
As shown in figure 9, Step 5: setting up the prefabricated stringer of top layer on the column of upper layer, the upper end of prefabricated stringer is wider, is convenient for
Subsequent top layer template is set up, and the reinforcing bar of contiguous prefabricated stringer end is connected, and pours the connector of prefabricated stringer, mixed to joint
After solidifying soil intensity is met the requirements, top plate 15 is set up later, the same step 3 of erection mode different from middle plate be top plate is herein folded
Plywood, is equipped with reinforcing bar in top plate superimposed sheet, superimposed sheet two ends reserved steel bar as required.
As shown in figs. 10-11, Step 6: pouring the connector at subway underground station top board structure and top plate, maintenance is extremely
Concrete roof intensity reaches requirement, forms casting top slab 16.After reaching requirement to intensity, the foundation pit support of top layer is removed.
Step 7: completing the superstructure construction of subway underground station, top plate of subway foundation pit or more is carried out later
Earthing 17 is backfilled, traffic above-ground can be restored.
Further include waterproof construction in another technical solution:
Before baseplate reinforcing bar erection, the entire bottom surface of first laying water-proof coiled material covering bottom plate, and the length of waterproof roll two sides
Degree is left to the top for extending to side wall in advance, and height of side wall includes the height of bottom side wall and upper layer side wall, it should be noted that anti-
The length of water coiled material not enough extends to side wall from bottom plate, and therefore, it is necessary to the splicings of multiple waterproof rolls.
The vertical pre-embedded steel slab sealing of length direction after baseplate reinforcing bar erection, in the junction of bottom plate side wall and bottom plate
Band pours underplate concrete again later.
In the above-mentioned technical solutions, for compared to station construction under existing subway, reduce the construction of fertile slot, one
As the construction of fertile slot be to carry out waterproof construction and be fixed temporarily prefabricated side wall in building enclosure, the later period is still with element
Concrete backfill not only increases construction cost and extends the duration, and the width of general fertile slot is suitable with lateral wall width, is
0.8~1m, the foundation pit two sides of subway underground station will reserve fertile slot, therefore width will at least increase in excavation pit
1.6m is again increased and is excavated cost and difficulty of construction.It is used using cast-in-place+prefabricated side wall concrete that can be saved by about one time
Amount；Meanwhile the presence of fertile slot increases the width of excavation of foundation pit, is required in stringent urban district in effect on environment, has it certain
Limitation.Cast-in-place+prefabricated construction subway station side wall can evade this problem, reduce the shadow that excavation of foundation pit settles surrounding
It rings.
In another technical solution, the upper end of the bottom column and the upper end of bottom side wall all have bracket,
Herein, the bracket frame setting of prefabricated side wall superimposed sheet is on its top, after final side wall superimposed sheet completion pours, the top of formation
Area is big, similar up big and down small trapezoidal bracket；The bracket of same prefabricated pile top setting be directly poured it is upper greatly
Under small trapezium structure, inside has reinforcing bar, and setting bracket is for facilitating setting up for prefabricated stringer.
In another technical solution, the middle part of the prefabricated side wall superimposed sheet lower end and the middle part of prefabricated pile lower end
It is respectively and fixedly provided with circular column leg, and circular column leg is slightly longer than grout sleeve, to support prefabricated side wall superimposed sheet and prefabricated pile.
In the above-mentioned technical solutions, temporarily connecting between prefabricated side wall superimposed sheet and building enclosure (ground-connecting-wall) is eliminated
It connects, directly a part by circular column leg as support, is poured to be integrated later and save the construction time.
It further include multiple support rods, Specific construction step in another technical solution are as follows:
When the dowel connection corresponding with bottom plate of the grout sleeve of prefabricated side wall superimposed sheet and prefabricated pile in step 2, and
After circular column leg supports prefabricated side wall superimposed sheet and prefabricated pile, the support rod 9 is obliquely installed, and passes through fixing piece and prefabricated side wall
Superimposed sheet, prefabricated pile and bottom plate are fixed, and remove support rod again after the completion of the construction of middle plate.
In the above-mentioned technical solutions, support rod set-up mode such as Fig. 4, support rod by fixing piece both ends respectively with prefabricated side
Wall superimposed sheet and bottom plate are fixed, likewise, more support rods resist bottom column from two sides, it is more optimized to ensure that bottom side
The limit of wall and bottom column prevents from tilting.
Side wall superimposed sheet is supported with the used temporary support of this construction method (support rod), it is convenient and efficient.It avoids
Temporary support load is transmitted in building enclosure, generates hidden danger to prevent the general safety to building enclosure；Temporary support, with pre-
The component being embedded on prefabricated component and plate is firm.Temporary support stress, power transmission are rationally simple.
Such as Figure 12-14, in another technical solution, it should be noted that being horizontal from left to right in Fig. 1~Figure 12
To, be from front to back longitudinal direction, when the position of plate in erection and top plate encounters prop 18 (prop be typically all tearing open
Except being removed again after the foundation pit support 3 of top layer), the infall of the middle plate and top plate and prop is reserved with gap, gap
Positioned at the side of middle plate and top plate longitudinal direction, the gap 20 of upper two middle plates 13 or two top plates is spliced into an entirety along longitudinal direction,
It is passed through for prop, and the reserved connection reinforcing bar 19 in side of gap longitudinal direction connects adjacent middle plate gap after prop dismounting
Place's connection reinforcing bar and adjacent top plate opening position connect reinforcing bar, and casting concrete.
In another technical solution, junction is poured specifically, junction is first divided into inner ring and outer rings, outer ring
Diameter is 1~3 times of annular diameters, is taken away after inner ring concrete initial set in inner ring formwork, and in inner ring casting concrete
Inner ring template fixes the first fiberglass gridding cloth in the circle of outer Monday of inner ring concrete, later by outer later in outer ring formwork
Ring formwork tilts down 30 °~60 ° cricoid second fiberglass gridding cloths of setting to the direction of the first fiberglass gridding cloth,
And multiple second fiberglass gridding cloths are from top to bottom provided in outer ring, the spacing of adjacent second fiberglass gridding cloth is 8
~10cm, the later casting concrete in outer ring formwork.
After being poured due to existing junction, the later period is easy to appear crackle, for this problem, in the technical program, leads to
Cross it is secondary pour and be arranged the first fiberglass gridding cloth and the second fiberglass gridding cloth, junction can be significantly improved
Anti-crack ability improves construction quality.Compare through overtesting, a direct formwork pours junction, and factor of safety against cracking is
1.27, the 28th day infiltration grade resistant to pressure is greater than P8 and is less than P12, and formwork pours and glass fibre is arranged twice using this method
Grid cloth, factor of safety against cracking 1.48, and the 28th day infiltration grade resistant to pressure is greater than P12.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (6)
1. a kind of in-situ deposited prefabricated split-mounting type subway underground station construction method, construction is completed in excavation of subway foundation pit supporting
In foundation pit afterwards, which comprises the following steps:
Step 1: construction of bottom plates: baseplate reinforcing bar being placed in the bottom of foundation pit, bottom column and bottom are corresponded on the baseplate reinforcing bar
Dowel is provided at side wall, after-pouring underplate concrete, met the requirements to underplate concrete intensity, remove the foundation pit of bottom
Support；
Step 2: bottom column and the construction of bottom side wall:
The upper end of prefabricated side wall superimposed sheet reserves dowel, and lower end is provided with grout sleeve, and prefabricated side wall superimposed sheet
Inside wall be provided with side reinforcing bar, the upper end of prefabricated pile reserves dowel, grout sleeve is arranged in lower end；First by prefabricated side wall
The side reinforcing bar of superimposed sheet is connected with corresponding bottom plate dowel, then erecting side wall superimposed sheet and prefabricated pile, specifically, point
Corresponding with the bottom plate dowel of the grout sleeve of prefabricated side wall superimposed sheet and prefabricated pile is not connected, to junction and prefabricated
Gap between side wall superimposed sheet and foundation pit enclosure structure is by grout sleeve casting concrete, so that bottom column, bottom side
Wall, bottom plate and foundation pit enclosure structure form entirety, and conserve to intensity and meet the requirements；
Step 3: the construction of middle plate: overlapping prefabricated stringer on bottom column, connecting the reinforcing bar of contiguous prefabricated stringer end, and pour
The connector for building prefabricated stringer after concrete strength is met the requirements after joint, sets up prefabricated middle plate, the prefabricated middle plate have with
The dowel of bottom side wall connection, the dowel that is connect with contiguous prefabricated middle plate and and the dowel that connects of upper one layer of column；
To prefabricated middle plate and bottom side wall junction, contiguous prefabricated middle plate junction casting concrete, maintenance meets the requirements to intensity, tears open
Except the foundation pit support in middle layer；
Step 4: repeating step 2 and step 3, the superstructure construction of subway underground station is completed, later to subway foundation pit
Top plate or more carries out backfill earthing；Wherein, top plate is superimposed sheet, and reinforcing bar is equipped in top plate, and two ends are pre- as required
Stay reinforcing bar；
Wherein, junction pours specifically, junction is first divided into inner ring and outer rings, and outer annular diameter is the 1 of annular diameters
~3 times, in inner ring formwork, and in inner ring casting concrete, after inner ring concrete initial set, take inner ring template away, outside later
Ring formwork fixes the first fiberglass gridding cloth in the circle of outer Monday of inner ring concrete, later from outer ring formwork to the first glass
The direction of fibrous mesh cloth tilts down 30 °~60 ° cricoid second fiberglass gridding cloths of setting, and in outer ring from top to bottom
Multiple second fiberglass gridding cloths are provided with, the spacing of adjacent second fiberglass gridding cloth is 8~10cm, later in outer ring
Casting concrete in formwork.
2. in-situ deposited prefabricated split-mounting type subway underground station as described in claim 1 construction method, which is characterized in that also wrap
Include waterproof construction:
Before baseplate reinforcing bar erection, the entire bottom surface of first laying water-proof coiled material covering bottom plate, and the length of waterproof roll two sides is pre-
It is left to the top for extending to side wall, height of side wall includes the height of bottom side wall and upper layer side wall；
After baseplate reinforcing bar erection, the vertical pre-embedded steel slab waterstop of length direction in the junction of bottom plate side wall and bottom plate, it
Pour underplate concrete again afterwards.
3. in-situ deposited prefabricated split-mounting type subway underground station as described in claim 1 construction method, which is characterized in that described
The upper end of bottom column and the upper end of bottom side wall all have bracket.
4. in-situ deposited prefabricated split-mounting type subway underground station as described in claim 1 construction method, which is characterized in that
Circular column leg, and circular column leg are respectively and fixedly provided in the middle part of the middle part and prefabricated pile lower end of the prefabricated side wall superimposed sheet lower end
It is slightly longer than grout sleeve, to support prefabricated side wall superimposed sheet and prefabricated pile.
5. in-situ deposited prefabricated split-mounting type subway underground station as claimed in claim 4 construction method, which is characterized in that also wrap
Include multiple support rods, Specific construction step are as follows:
When corresponding with the bottom plate dowel connection of the grout sleeve of prefabricated side wall superimposed sheet and prefabricated pile in step 2, and cylinder
After leg supports prefabricated side wall superimposed sheet and prefabricated pile, the support rod is obliquely installed, and is overlapped by fixing piece and prefabricated side wall
Plate, prefabricated pile and bottom plate are fixed, and remove support rod again after the completion of the construction of middle plate.
6. in-situ deposited prefabricated split-mounting type subway underground station as described in claim 1 construction method, which is characterized in that work as frame
If the position of middle plate and top plate encounters prop, the infall of the middle plate and top plate and prop is reserved with open-minded
Mouthful, and in the reserved connection reinforcing bar of opening position, after prop dismounting, connect adjacent middle plate opening position connection reinforcing bar and adjacent
Top plate opening position connects reinforcing bar, and casting concrete.
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