CN113668564A - Construction method for supporting and reinforcing open-cut underground passage adjacent to subway station - Google Patents
Construction method for supporting and reinforcing open-cut underground passage adjacent to subway station Download PDFInfo
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- CN113668564A CN113668564A CN202111117104.7A CN202111117104A CN113668564A CN 113668564 A CN113668564 A CN 113668564A CN 202111117104 A CN202111117104 A CN 202111117104A CN 113668564 A CN113668564 A CN 113668564A
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- 238000010276 construction Methods 0.000 title claims abstract description 111
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- 230000002787 reinforcement Effects 0.000 claims abstract description 35
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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
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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Abstract
The invention discloses a supporting and reinforcing construction method of an open cut underground passage adjacent to a subway station, in particular to the technical field of underground passage construction, which comprises the following steps: s1, preparation before construction: confirming a construction measurement reference point and determining a construction area; s2, supporting and reinforcing: firstly, supporting one side of an underground passage, which is parallel to a subway shield interval, by a supporting pile and an inner support, then supporting the upper part of the subway shield interval by a grouting reinforcement area and an anti-floating pile, reinforcing the space between the underground passage and a subway station by a cement retaining wall, and then carrying out slope releasing excavation; and S3, constructing an underground passage and backfilling covering soil. According to the support reinforcement construction method for the underground passage close to the subway station, disclosed by the invention, the underground passage is conveniently constructed by using the open cut method through support reinforcement, the construction difficulty is reduced, the construction period is shortened, the construction cost is reduced, and meanwhile, the safety in the underground passage construction process is improved.
Description
Technical Field
The invention relates to the technical field of underground passage construction, in particular to a supporting and reinforcing construction method for an open cut underground passage close to a subway station.
Background
With the rapid development of urban economy in China and the promotion of urban modernization process, the available urban land area is increasingly limited, and traffic jam occurs in many cities.
In the related art, when the underground passage is close to a subway or a subway shield zone needs to be penetrated, an underground excavation method or a reverse construction method is generally adopted for construction, the construction of the underground passage is completed, the communication between the underground passage and a subway station is realized, and the traffic pressure on the ground is reduced.
In view of the above-mentioned related art, the inventor believes that when the underground passage is constructed by the underground excavation method or the reverse method, the construction period is long because of the technical difficulty.
Disclosure of Invention
In order to shorten the construction period, the invention provides a supporting and reinforcing construction method for an open cut underground passage close to a subway station.
The invention provides a construction method for supporting and reinforcing an open cut underground passage adjacent to a subway station, which adopts the following technical scheme:
a supporting and reinforcing construction method for an open cut underground passage close to a subway station comprises the following steps:
s1, preparation before construction: confirming a construction measurement reference point and determining a construction area;
s2, supporting and reinforcing: firstly, supporting one side of an underground passage, which is parallel to a subway shield interval, by a supporting pile and an inner support, then supporting the upper part of the subway shield interval by a grouting reinforcement area and an anti-floating pile, reinforcing the space between the underground passage and a subway station by a cement retaining wall, and then carrying out slope releasing excavation;
and S3, constructing an underground passage and backfilling covering soil.
By adopting the technical scheme, the construction measurement reference points and the construction measurement areas are determined, so that the measurement errors are reduced, and the possibility of construction accidents caused by the errors is further reduced; the arrangement of supporting reinforcement is convenient for reinforcing soil around the subway shield interval, so that the construction of an underground passage by using an open excavation method is facilitated, the construction difficulty is reduced, the construction period is shortened, the construction cost is reduced, and meanwhile, the safety in the construction process of the underground passage is improved; the underground passage is constructed, the earth is filled and the backfill is carried out, so that the pavement can be put into use conveniently, and the possibility of pavement collapse in the using process is reduced.
Optionally, in S2, when the side of the underground passage parallel to the subway shield zone is supported, the method includes the following steps,
firstly, determining the position of a support pile;
and secondly, construction of a support pile: firstly, drill holes through a drilling tool, then pour the supporting piles, and when the supporting piles are poured, the pouring amount of concrete is required to achieve the height of over-pouring, so that the effective length of the supporting piles is ensured.
By adopting the technical scheme, the position of the support pile is determined, the influence on the subway in the underground passage construction process is reduced, and the safe operation of the subway is ensured; constructing a support pile; the underground passage and the parallel side of the subway shield interval are conveniently supported, the transverse thrust of the inner support is borne, and the safety of underground passage construction is improved.
Optionally, in S2, during the construction of the support pile, a pile casing needs to be embedded after drilling, and the embedding depth of the pile casing is greater than or equal to 1.5 m.
Through adopting above-mentioned technical scheme, the setting of protecting a section of thick bamboo is convenient for fix a position when drilling, simultaneously, reduces the possibility of sediment backward flow among the drilling process, and then reduces the possibility of collapsing the hole.
Optionally, in S2, when the support is performed above the subway shield zone, the method includes the following steps,
firstly, soil body grouting reinforcement: firstly, excavating a deep hole, then putting a grouting pipe into the hole, performing segmented grouting on the grouting pipe from bottom to top to form a grouting reinforcement area, and further reinforcing soil bodies around a shield interval by the grouting reinforcement area.
And step two, construction of the anti-floating pile: firstly, the installation position of the anti-floating pile is determined, and then the elevation and the verticality of the anti-floating pile are confirmed, so that the anti-floating pile supports a grouting reinforcement area.
Through adopting above-mentioned technical scheme, the setting of slip casting reinforcing area and anti-floating pile is convenient for consolidate the soil body of subway shield interval top, reduces the risk of subway interval soil body come-up, and then improves the security in the underground passage work progress, simultaneously, reduces the influence to the subway operation in the work progress.
Optionally, in S2, when the soil body is grouted and reinforced, a sleeve valve pipe with a grout blocking plug needs to be inserted into the hole, so that the grouting pipe is inserted into the sleeve valve pipe.
Through adopting above-mentioned technical scheme, the setting of sleeve valve pipe is convenient for control slip casting scope and slip casting pressure, and then the shaping in the reinforced area of slip casting of being convenient for improves slip casting efficiency, simultaneously, reduces the possibility of thick liquid backward flow.
Optionally, in S2, soil layers between the underground passage and the outer wall of the subway station are stirred by a cement-soil stirring pile through a stirring machine to form a cement-soil retaining wall.
Through adopting above-mentioned technical scheme, the setting of cement mixing pile is convenient for mix soil layer and curing agent, and then strengthens soil layer intensity, reduces the possibility of soil layer landing in the work progress.
Optionally, in S2, the process of constructing the slope excavation includes the following steps,
step one, earth excavation: the earthwork excavation is carried out through the excavation tool, the layered and sectional type excavation is carried out during the earthwork excavation, and the excavated side wall of each layer of the foundation pit needs to be supported through the soil nailing wall in the excavation process.
Step two, integrally pouring the channel bottom plate and the anti-floating pile crown beam: when the earthwork is excavated to the designed elevation, a foundation pit is tested, then the reinforced steel bars are bound and placed in the foundation pit, and the integral pouring of the channel bottom plate and the anti-floating pile crown beam is completed.
By adopting the technical scheme, the soil nailing wall can be conveniently fixed by excavating in a layered and sectional manner, so that the soil nailing wall can conveniently fix the side wall of the foundation pit, the risk of soil body falling in the construction process is reduced, and the safety in the construction process is improved; the integral pouring of the channel bottom plate and the anti-floating pile crown beam improves the stability of the connection of the bottom plate and the anti-floating pile crown beam, is convenient for the connection of the anti-floating pile, and reduces the possibility of deformation of a soil body.
Optionally, the S1 includes the following steps,
firstly, confirming a construction measurement reference point;
secondly, determining a construction area: firstly, an underground structure contour line is thrown to the ground by using a total station, and then identification is carried out.
By adopting the technical scheme, the confirmation of the measuring reference point reduces the construction error and further improves the construction efficiency; the contour line is put in, and passerby knows the underground condition of being convenient for, reduces passerby mistake and goes into the possibility in construction area, and then improves the security of construction.
Optionally, the S3 includes the following steps,
the first step, the construction of underground passage: when the underground passage is constructed, the construction safety and the deformation condition of the periphery of the subway need to be detected;
step two, earthing and backfilling: the loess is selected firstly, and then backfilling is carried out in a layered mode, wherein the loess in each layer needs to be compacted in the backfilling process.
By adopting the technical scheme, the underground passage construction monitoring is convenient for grasping the construction environment in real time, the personal safety of workers is guaranteed, and meanwhile, the normal operation of construction is guaranteed; the earthwork is backfilled in a layering manner, so that loess can be compacted conveniently, the pavement quality can be improved conveniently, and the possibility of pavement collapse in the using process is reduced.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the construction measurement datum point and the construction measurement area are determined, so that the measurement error is reduced, and the possibility of construction accidents caused by errors is further reduced; the arrangement of supporting reinforcement is convenient for reinforcing soil around the subway shield interval, and the construction of an underground passage is convenient to carry out by using an open excavation method, so that the construction difficulty is reduced, the construction period is shortened, the construction cost is reduced, and meanwhile, the safety in the construction process of the underground passage is improved; the construction and the earthing backfill of the underground passage are convenient for putting the pavement into use, and the possibility of pavement collapse in the using process is reduced;
2. the arrangement of the grouting reinforcement area and the anti-floating piles is convenient for reinforcing the soil body above the subway shield area, the risk of floating of the soil body in the subway area is reduced, the safety in the underground passage construction process is further improved, and meanwhile, the influence on the subway operation in the construction process is reduced;
3. the method has the advantages that the soil nailing wall is convenient to fix by means of layered and sectional excavation, so that the soil nailing wall can fix the side wall of the foundation pit conveniently, the risk of soil body falling in the construction process is reduced, and the safety in the construction process is improved; the integral pouring of the channel bottom plate and the anti-floating pile crown beam improves the stability of the connection of the bottom plate and the anti-floating pile crown beam, is convenient for the connection of the anti-floating pile, and reduces the possibility of deformation of a soil body.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the invention.
Fig. 2 is a plan view of the support reinforcement of the subway station according to the embodiment of the present invention.
Fig. 3 is a sectional view of the A-A of the support reinforcement of the subway station in the embodiment of the invention.
Fig. 4 is a B-B sectional view of the support reinforcement of the subway station according to the embodiment of the present invention.
Fig. 5 is a C-C section view of the support reinforcement of the subway station in the embodiment of the invention.
Description of reference numerals: 1. a column; 2. supporting in the concrete; 3. soil nailing walls; 4. anti-floating piles; 5. grouting a reinforcing area; 6. a cement soil retaining wall; 7. supporting in a steel pipe; 8. and (6) supporting the piles.
Detailed Description
The present invention is described in further detail below with reference to figures 1-5.
The embodiment of the invention discloses a construction method for supporting and reinforcing an open cut underground passage close to a subway station. Referring to fig. 1, the construction method for supporting and reinforcing the open cut underground passage adjacent to the subway station comprises the following steps:
s1, preparation before construction:
s11, confirming a construction measuring reference point; because the subway construction measurement datum point and the underground passage measurement datum point are possibly inconsistent, a general engineer, a technical engineer and a measurement engineer of both parties are required to recheck the measurement datum point, the consistency of measuring point data used by both parties is ensured, and the possibility of safety accidents in the underground passage and subway construction process caused by measurement deviation is reduced.
S12, determining a construction area: firstly, a total station is utilized to put contour lines of a constructed subway shield interval, a constructed subway station and an attached structure on the ground, and then identification is carried out; the underground structure is convenient for passerby to know, and the possibility that passerby enters the construction area by mistake is reduced.
S2, with reference to fig. 2, 3 and 4, supporting and reinforcing: firstly, supporting one side of an underground passage, which is parallel to a subway shield interval, by a supporting pile 8 and an inner support, then supporting the upper part of the subway shield interval by a grouting reinforcement area 5 and an anti-floating pile 4, reinforcing the space between the underground passage and a subway station by a cement retaining wall 6, and then carrying out slope releasing excavation; in this embodiment, firstly, one side of the underground passage parallel to the subway shield interval is supported, and then, the upper side of the subway shield interval is supported, in other embodiments, the two supporting sequences can be changed, in this embodiment, the inner support is the steel pipe inner support 7 and the concrete inner support 2, the steel pipe inner support 7 is provided with two, and the concrete inner support 2 is provided with three.
S21, when one side of the underground passage parallel to the subway shield zone is supported, the method comprises the following steps:
s211, determining the position of the support pile 8: according to a construction drawing, manually excavating a ditch, then carrying out moving and modifying on a pipeline, after the pipeline moving and modifying is completed, determining the safe distance between a support pile 8 and a precipitation well and a subway, and further determining the construction positions of the support pile 8 and the precipitation well; the arrangement of the supporting piles 8 is convenient for supporting one side of the underground passage parallel to the subway shield interval, the possibility of soil body sliding in the construction process is reduced, and the arrangement of the dewatering well is convenient for discharging water in a foundation pit and further convenient for construction of the underground passage.
S212, construction of the support piles 8: firstly, drilling by using a drilling tool, then confirming the elevation and the size of a formed hole, embedding a protective cylinder in the formed hole, wherein the embedding depth of the protective cylinder is more than or equal to 1.5m, the deviation between the center of the protective cylinder and the center of a pile position is less than or equal to 50mm, then lowering a reinforcement cage into the formed hole, then injecting concrete, pouring the support pile 8, and when the support pile 8 is poured, the pouring amount of the concrete is required to be the over-pouring height, so that the effective length of the support pile 8 is ensured; then the dewatering well is constructed and debugged, so that the dewatering well can normally drain water in the construction process, then the two ends of the steel pipe inner support 7 are connected with the support piles 8 through bolts and used for supporting the side wall adjacent to the subway shield region, the concrete inner support 2 is used for supporting the corner of the underground passage, the two ends of the concrete inner support 2 are bonded with the support piles 8, and then the side, close to the ground, of the concrete inner support 2 is supported by the upright post 1.
S22, referring to fig. 2 and 4, when supporting the upper part of the subway shield zone, the method includes the following steps:
s221, soil body grouting reinforcement: firstly, excavating a deep hole, mounting a grout blocking plug at a grouting section of a sleeve valve pipe, winding hemp threads on the wall of the sleeve valve pipe to enable the hemp threads to be consistent with the hole diameter, putting the sleeve valve pipe with the hemp threads into the hole, then injecting a casing material to the hole opening, putting a grouting pipe with double plugs into the sleeve valve pipe after the casing material is solidified, then performing open-loop grouting to enable the grouting pipe to perform segmented grouting from bottom to top, wherein the segmented length in the embodiment is 0.33m, pouring of a grouting reinforcement area 5 is realized, and further the grouting reinforcement area 5 reinforces the soil body above a shield interval.
S222, construction of the anti-floating pile 4: at first confirm the mounted position of anti-floating pile 4, then through the elevation and the straightness that hangs down of measuring tool anti-floating pile 4 confirm, make anti-floating pile 4 support slip casting reinforcing area 5, and then make anti-floating pile 4 and slip casting reinforcing area 5 form gate-type reinforcing structure, reduce the risk of subway shield interval top soil come-up in the work progress, reduce the construction degree of difficulty, shorten construction cycle, reduce construction cost, and simultaneously, improve the security in the work progress, guarantee the normal clear of construction, be provided with three rows of anti-floating pile 4 in this embodiment.
S23, referring to fig. 2 and 5, the cement soil mixing pile is used to form the cement soil retaining wall 6 through the mixing machine, and the distance between the mixing machine and the outer wall of the subway is kept during the mixing process, so as to reduce the damage of the mixing machine to the outer wall of the subway, in this embodiment, the central slurry conveying mixing special machine is used, in other embodiments, the double mixing or other special machines capable of completing the mixing can be used, and in the construction process, 2-spraying and 4-stirring are used, so as to improve the construction efficiency and shorten the construction period.
S24, referring to fig. 2 and 5, the hill releasing and digging includes the following steps:
s241, earth excavation: carrying out earth excavation through an excavation tool, carrying out layered and sectional excavation during earth excavation, simultaneously carrying out excavation while spraying, wherein the excavation ratio in the range of the reinforced soil body is 1:0.3, then draining the excavated foundation pit, reducing the accumulation of water in the foundation pit, wherein the excavation depth of each layer is less than or equal to 1.5m, and the side wall of each layer of pit after excavation needs to be supported in the excavation process, the soil nailing wall 3 is formed by artificial hole forming and grouting, or the steel plate is adopted for weight reduction, the disturbance to the surrounding soil body and the damage to the subway structure are reduced by artificial hole forming, meanwhile, the exposure time of the foundation pit is reduced, the total weight of construction materials and equipment at the periphery of the foundation pit is less than or equal to the ground load limit value of 20kpa in the construction process, and the load can not be piled within 2m of the periphery of the foundation pit, so that the load of the periphery of the foundation pit is reduced, and the safety of foundation pit construction is further improved.
S242, integrally pouring the channel bottom plate and the anti-floating pile 4 crown beam: when earthwork excavation to design elevation, carry out the foundation ditch and examine the groove, then place in the foundation ditch after with reinforcement, pour into the concrete again in to the foundation ditch, accomplish the monolithic of passageway bottom plate and anti-floating pile 4 crown roof beams and pour, improve support strength, simultaneously, improve the stability that anti-floating pile 4 is connected.
S3, constructing underground passages and backfilling covering soil:
s31, construction of underground passages: when the underground passage is constructed, the construction safety and the deformation condition of the periphery of the subway need to be continuously detected, so that workers can conveniently master the change of the soil body at the periphery of the underground passage in real time, the possibility of accidents is reduced, and the loss is further reduced;
s32, earthing and backfilling: the loess is selected firstly, and then is backfilled layer by layer, and the loess of each layer needs to be compacted in the backfilling process, so that the earthing backfilling quality is improved, and the possibility of earthwork collapse in the using process is reduced.
The implementation principle of the construction method for supporting and reinforcing the open cut underground passage adjacent to the subway station in the embodiment of the invention is as follows: firstly, confirming a construction measuring datum point, then marking a ground condition, guiding and modifying a pipeline according to a drawing, then supporting one side of an underground passage parallel to a subway shield region through the matching of a support pile 8 and a steel pipe inner support, supporting the corner of the underground passage through the matching of the support pile 8 and a concrete inner support, supporting the upper part of the subway shield region through a gate structure formed by a grouting reinforcement region 5 and an anti-floating pile 4, then stirring soil layers between the underground passage and a subway outer wall by a cement soil stirring pile through a stirring machine to form a cement soil retaining wall 6, reinforcing the connection between the underground passage and the subway, excavating earthwork in a sectional type, supporting the side wall of a foundation pit through an earth nail wall 3, then integrally pouring a bottom plate of the underground passage and a crown beam of the anti-floating pile 4, and finishing all construction, and then constructing the underground passage, and after the construction is finished, performing earth covering and backfilling and road restoration.
The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. A supporting and reinforcing construction method for an open cut underground passage close to a subway station is characterized by comprising the following steps: the method comprises the following steps:
s1, preparation before construction: confirming a construction measurement reference point and determining a construction area;
s2, supporting and reinforcing: firstly, supporting one side of an underground passage, which is parallel to a subway shield interval, by a supporting pile (8) and an inner support, then supporting the upper side of the subway shield interval by a grouting reinforcement area (5) and an anti-floating pile (4), reinforcing the space between the underground passage and a subway station by a cement retaining wall (6), and then carrying out slope releasing excavation;
and S3, constructing an underground passage and backfilling covering soil.
2. The open-cut underground passage support reinforcement construction method next to a subway station as claimed in claim 1, characterized in that: in S2, when the side of the underground passage parallel to the subway shield zone is supported, the method includes the steps of,
firstly, determining the position of a support pile (8);
and secondly, construction of a support pile (8): firstly, drilling is carried out through a drilling tool, then the supporting pile (8) is poured, and when the supporting pile (8) is poured, the pouring amount of concrete is required to be the height of over-pouring, so that the effective length of the supporting pile (8) is ensured.
3. The open-cut underground passage support reinforcement construction method next to a subway station as claimed in claim 2, characterized in that: in S2, when the supporting pile (8) is constructed, a pile casing needs to be embedded in a drilled hole, and the embedding depth of the pile casing is larger than or equal to 1.5 m.
4. The open trench underground passage support reinforcement construction method next to a subway station as claimed in any one of claims 1 to 3, characterized in that: in S2, when the support is performed above the subway shield zone, the method includes the steps of,
firstly, soil body grouting reinforcement: firstly, excavating a deep hole, then, putting a grouting pipe into the hole, and performing segmented grouting on the grouting pipe from bottom to top to realize pouring of a grouting reinforcement area (5), so that the grouting reinforcement area (5) reinforces soil bodies around a shield area;
and secondly, constructing the anti-floating pile (4): firstly, the installation position of the anti-floating pile (4) is determined, and then the elevation and the verticality of the anti-floating pile (4) are confirmed, so that the anti-floating pile (4) supports the grouting reinforcement area (5).
5. The open-cut underground passage support reinforcement construction method next to a subway station as claimed in claim 4, characterized in that: in S2, when grouting and reinforcing the soil body, a sleeve valve pipe with a grout blocking plug needs to be inserted into the hole, so that the grouting pipe is inserted into the sleeve valve pipe.
6. The open-cut underground passage support reinforcement construction method next to a subway station as claimed in claim 4, characterized in that: and in S2, soil layers between the underground passage and the outer wall of the subway station are stirred by a cement soil stirring pile through a stirring machine to form a cement soil retaining wall (6).
7. The open-cut underground passage support reinforcement construction method next to a subway station as claimed in claim 4, characterized in that: in S2, the process of constructing the open slope excavation includes the steps of,
step one, earth excavation: carrying out earth excavation through an excavation tool, carrying out layered and sectional excavation during earth excavation, and supporting the side wall of each layer of pit after excavation through a soil nailing wall (3) in the excavation process;
secondly, integrally pouring a channel bottom plate and a crown beam of the anti-floating pile (4): when the earthwork is excavated to the designed elevation, the groove inspection of the foundation pit is carried out, then the reinforced steel bars are bound and placed in the foundation pit, and the integral pouring of the channel bottom plate and the anti-floating pile (4) top beam is completed.
8. The open-cut underground passage support reinforcement construction method next to a subway station as claimed in claim 1, characterized in that: the S1 includes the steps of,
firstly, confirming a construction measurement reference point;
secondly, determining a construction area: firstly, an underground structure contour line is thrown to the ground by using a total station, and then identification is carried out.
9. The open-cut underground passage support reinforcement construction method next to a subway station as claimed in claim 1, characterized in that: the S3 includes the steps of,
the first step, the construction of underground passage: when the underground passage is constructed, the construction safety and the deformation condition of the periphery of the subway need to be detected;
step two, earthing and backfilling: the loess is selected firstly, and then backfilling is carried out in a layered mode, wherein the loess in each layer needs to be compacted in the backfilling process.
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