CN115341570A - Method for building closely-adhered hard-contact supporting top of underpass extension subway station micro-deformation - Google Patents
Method for building closely-adhered hard-contact supporting top of underpass extension subway station micro-deformation Download PDFInfo
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- 239000010410 layer Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 10
- 238000009434 installation Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 4
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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
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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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
- 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
- E02D29/05—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 at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—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 at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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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
- E02D31/08—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 transmission of vibrations or movements in the foundation soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a method for constructing a close-contact hard-contact supporting roof for micro-deformation of a underpass extension subway station, which comprises the following three steps of pilot tunnel construction, grouting reinforcement operation, monitoring point arrangement and the like. In the primary support construction process, a plurality of detection points are arranged, monitoring frequency is encrypted, the construction operation state and the stress state are detected through the detection points, and construction parameters are adjusted in time according to the monitoring result. Compared with the traditional construction method, the construction method has the advantages of simple structure, easiness in material taking, small material loss, flexibility and convenience in operation, good universality and small physical loss during operation, meets the requirement on construction deformation, effectively prevents the structure from deforming, can effectively detect the stress state of the supporting operation, and further improves the construction work precision, the convenience and the precision of daily detection and maintenance.
Description
Technical Field
The invention relates to a subway station construction technology, in particular to a method for constructing a close-contact hard contact supporting roof for micro deformation of a underpass extension subway station.
Background
At present, in the construction of subway station extension and the like, construction is often required to be carried out on the premise of effective supporting operation on the current subway station structure, and aiming at the construction requirement, various construction technologies are currently developed, for example, patents such as a construction method for closely sticking and penetrating an existing station pre-supporting roof structure at a subway station with a patent application number of 202110057450.4, a construction method for differentially sinking and controlling pre-supporting roof excavation at a penetrating subway station seam deformation and a construction method for closely penetrating a subway station underground excavation channel with a patent application number of 202010209697.9 and a method for reinforcing the underground excavation channel at a near distance with a patent application number of 202110789533.2 can meet the requirement of construction operation at different degrees, but have the defects of complex construction process, high operation implementation difficulty and labor intensity, and easily cause a large amount of material loss in the construction process, so that the construction cost is high, and in the subsequent detection of the construction process and after the construction is finished, the deformation detection and the monitoring operation difficulty is high, and the current operation precision is relatively low, and the construction inconvenience is caused.
Therefore, in order to meet the actual use requirement, a micro-deformation close-contact hard-contact supporting method for a subway station to pass through is urgently needed to be developed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for constructing a close-contact hard contact supporting roof for the micro deformation of a underpass extension subway station, which is realized by the following technical scheme:
a method for constructing a low-pass expanded subway station micro-deformation close-contact hard-contact supporting roof comprises the following steps:
s1, pilot hole construction, namely, constructing by adopting a PBA construction method of two pilot holes with small influence on an existing line, forming side piles by adopting machinery, wherein the section of a lower penetrating section is a rectangular section, and flatly and closely attaching an existing tunnel bottom plate of a subway line; firstly, arranging a row of lead screw supporting mechanisms in the side pilot tunnel and the middle cavern respectively, then jacking the inner skin of the primary support through I-shaped steel to tightly jack the bottom plate of the existing structure, and jacking the existing structure through adjusting pre-stress by the lead screw of the side pilot tunnel to ensure no void; the screw rod of the middle chamber has no pre-stress; finally, arranging a plain concrete structure on the upper layer of the top plate of the pilot tunnel, keeping the I-shaped steel supported above the screw rod in the plain concrete structure, arranging a single-layer anti-cracking reinforcing mesh on the upper layer in the plain concrete structure, and closely attaching the top surface of the primary support to the existing station structure through the plain concrete structure and the single-layer anti-cracking reinforcing mesh;
s2, grouting reinforcement operation, namely performing deep hole grouting on the periphery and the tunnel face of the pilot tunnel before excavation, wherein the grouting range is 1.8-2.5 meters outwards and 0.3-1 meter inwards of the excavation outline; grouting the base of the pilot tunnel in time after the pilot tunnel is closed into a ring, and performing side pile construction after the base grouting reaches the strength; during construction, the top of a crown beam is closely attached to the inner surface of an upper pilot tunnel during construction, 1 back grouting pipe is reserved at intervals of 0.8-1.5 m at the back of the crown beam, and meanwhile, a back grouting effect is performed on the fender pile; grouting after primary support is additionally carried out in the primary support construction process of the pilot tunnel and the buckling arch;
and S3, monitoring points are distributed, a plurality of detection points are arranged and the monitoring frequency is encrypted in the primary support construction process, the construction operation state and the stress state are detected through the detection points, and the construction parameters are adjusted in time according to the monitoring result.
Further, in the step S1, a temporary middle partition and a middle partition are added during excavation of the soil under the primary support arch and the primary support arch, and when the middle partition and the middle partition are removed, the intermediate partition and the middle partition are supported by adjusting the screw rod support mechanism to overcome the settlement caused by removal of the middle partition and the middle partition.
Further, in the step S1, when a plain concrete structure is constructed, in order to ensure compactness of concrete pouring on both sides of the i-shaped steel, the section steel may be subjected to grouting at a certain distance in the longitudinal direction.
Further, in the step S1, the screw support mechanism includes a bearing base, a bearing screw, a single-layer anti-cracking steel bar mesh and a bearing section steel, the bearing section steel is 1-2 pieces, the upper end surface and the lower end surface of the bearing section steel are connected with the single-layer anti-cracking steel bar mesh, the single-layer anti-cracking steel bar mesh and the bearing section steel are distributed in parallel along the axis direction of the bearing section steel, a plurality of locating holes are uniformly distributed on the lower end surface of the bearing section steel along the axis direction of the bearing section steel, each locating hole is connected with the upper end surface of one bearing screw and coaxially distributed, through holes are formed in the single-layer anti-cracking steel bar mesh corresponding to the locating holes, the single-layer anti-cracking steel bar mesh is wrapped outside the bearing screw and connected with the bearing screw through the through holes, the lower end surface of the bearing screw is connected with the bearing base and coaxially distributed between the bearing base, the bearing base is of a plate-shaped structure with a rectangular cross section, at least one pre-buried hook is formed on the lower end surface of the bearing base, and the pre-buried hook and the lower end surface of the bearing base forms an included angle of 45-90 degrees with the lower end of the bearing base.
Furthermore, the bearing section steel is any one of section steel with an I-shaped or '2127474', the cross section of the bearing section steel is uniformly distributed with a plurality of connecting buckles, the connecting buckles are uniformly distributed along the axial direction of the bearing section steel, the connecting buckles are connected with the single-layer anti-cracking steel bar net pieces through binding bars, and the single-layer anti-cracking steel bar net pieces arranged on the upper end surface and the lower end surface of the bearing section steel are connected through a plurality of binding bars.
Furthermore, the single-layer anti-cracking reinforcing mesh sheets connected with the upper end surface and the lower end surface of the bearing section steel and the groove body of the bearing section steel are additionally connected by grouting materials,
the bearing lead screw comprises a bottom support, a universal hinge, a positioning block, a driving lead screw, a pressure sensor, a level instrument and a wiring terminal, wherein the cross section of the bottom support is of a '20866' shaped groove structure, the upper end surface of the bottom support is connected with and coaxially distributed with the lower end surface of the driving lead screw, the lower end surface of the bottom support is hinged with the upper end surface of the bearing base through the universal hinge, 30% -80% of the height of the universal hinge is partially embedded in a bottom support groove body, the upper end surface of the driving lead screw is in sliding connection and coaxial distribution with a positioning block through a bearing, the bottom of the positioning block is embedded in the positioning hole and is connected with bearing section steel through the positioning hole, the outer side surface of the positioning block is connected with a single-layer anti-cracking steel bar net piece through a through hole wall, the level instrument is embedded in the upper end surface of the bottom support, the pressure sensor is embedded in the upper end surface of the positioning block and coaxially distributed with the positioning block, the pressure sensor abuts against the bottom of the positioning hole, the driving lead screw, the pressure sensor and the level instrument are electrically connected with the wiring terminal, and at least one wiring terminal is embedded in the outer side surface of the bottom support.
Furthermore, the distance between the lower end surface of the bottom support and the bearing base is not less than 10 mm, and the lower end surface of the bottom support and the bearing base are connected through at least three springs uniformly distributed around the axis of the bottom support.
Compared with the traditional construction method, the construction method adopted by the invention has the advantages of simple structure, accessible materials, small material loss, flexible and convenient operation, good universality and small physical loss during operation, simultaneously meets the requirement on construction deformation, effectively prevents the structure from deforming, can effectively detect the stress state of the supporting operation, and further improves the construction work precision and the convenience and precision of daily detection and maintenance.
Drawings
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic flow chart of the construction method of the present invention;
FIG. 2 is a layout diagram of a primary branch backfill grouting pipe;
FIG. 3 is a partial structural view of a lead screw bulk sample supporting operation;
FIG. 4 is a longitudinal arrangement diagram of a pilot tunnel screw and a cross beam
Fig. 5 is a schematic structural view of the screw support mechanism.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-4, a method for constructing a close-contact hard-contact supporting roof for micro-deformation of a underpass extension subway station comprises the following steps:
s1, pilot hole construction, namely, constructing by adopting a PBA construction method of two pilot holes with small influence on an existing line, forming side piles by adopting machinery, wherein the section of a lower penetrating section is a rectangular section, and flatly and closely attaching an existing tunnel bottom plate of a subway line; firstly, arranging a row of lead screw supporting mechanisms in a side pilot tunnel and a middle cavern respectively, then jacking the inner skin of a primary support through I-shaped steel to be tightly propped against a bottom plate of an existing structure, and jacking the existing structure through adjusting a pre-stress of a lead screw of the side pilot tunnel to ensure no void; the screw rod of the middle chamber has no pre-stress; finally, arranging a plain concrete structure on the upper layer of the top plate of the pilot tunnel, keeping the I-shaped steel supported above the screw rod in the plain concrete structure, arranging a single-layer anti-cracking reinforcing mesh on the upper layer in the plain concrete structure, and closely attaching the top surface of the primary support to the existing station structure through the plain concrete structure and the single-layer anti-cracking reinforcing mesh;
s2, grouting reinforcement operation, namely performing deep hole grouting on the periphery and the tunnel face of the pilot tunnel before excavation, wherein the grouting range is 1.8-2.5 meters outwards and 0.3-1 meter inwards of the excavation outline; grouting a pilot tunnel base in time after the pilot tunnel is closed into a ring, and performing side pile construction after the base grouting reaches the strength; during construction, the top of a crown beam is closely attached to the inner skin of an upper pilot tunnel, 1 rear grouting pipe is reserved at intervals of 0.8-1.5 m at the back of the crown beam, and meanwhile, the post grouting effect is performed on the fender post; grouting after primary support is additionally carried out in the primary support construction process of the pilot tunnel and the buckling arch;
in addition, when secondary lining construction is required in construction, secondary lining post-grouting is required in the secondary lining construction process;
and S3, monitoring points are distributed, a plurality of detection points are arranged and the monitoring frequency is encrypted in the primary support construction process, the construction operation state and the stress state are detected through the detection points, and the construction parameters are adjusted in time according to the monitoring result.
In this embodiment, in the step S1, a temporary middle partition and a middle partition are added during excavation of the soil under the primary support arch and the arch, and when the middle partition and the middle partition are removed, the support acting force of the screw rod support mechanism is adjusted to overcome the settlement caused by removal of the middle partition and the middle partition.
In this embodiment, in the step S1, when a plain concrete structure is constructed, in order to ensure the compactness of concrete pouring on both sides of the i-shaped steel, the section steel may be subjected to grouting at a certain distance along the longitudinal direction.
As shown in fig. 5, it is emphasized that in the step S1, the screw support mechanism includes a bearing base 1, a bearing screw 2, a single-layer anti-cracking steel bar mesh 3 and a bearing section steel 4, the bearing section steel 4 is 1-2 pieces, the upper end surface and the lower end surface of the bearing section steel 4 are both connected to a plurality of single-layer anti-cracking steel bar meshes 3, the single-layer anti-cracking steel bar meshes 3 and the bearing section steel 4 are distributed in parallel along the axis direction of the bearing section steel 4, a plurality of positioning holes 5 are uniformly distributed on the lower end surface of the bearing section steel 4 along the axis, each positioning hole 5 is connected to and coaxially distributed on the upper end surface of one bearing screw 2, the single-layer anti-cracking steel bar mesh 3 corresponding to the positioning hole 5 is provided with a through hole 6, the single-layer anti-cracking steel bar mesh 3 is coated outside the bearing screw 2 through the through hole 6 and connected to the bearing screw 2, the lower end surface of the bearing screw 2 is connected to the bearing base 1 and coaxially distributed between the bearing base 1, the bearing base 1 is a plate-shaped structure with a cross section rectangular cross section, the lower end surface of the bearing base 1 is provided with at least one embedded hook 7, and the embedded hook is at an included angle of 45 ° -90 °.
The bearing section steel 4 is any one of section steel with an I-shaped or '21274' shaped cross section, a plurality of connecting buckles 41 are uniformly distributed on the lower end face of the upper end face of the bearing section steel 4, the connecting buckles 41 are uniformly distributed along the axial direction of the bearing section steel 4, the connecting buckles 41 are connected with the single-layer anti-cracking steel bar net pieces 3 through binding ribs 42, and the single-layer anti-cracking steel bar net pieces 3 arranged on the upper end face and the lower end face of the bearing section steel 4 are connected through a plurality of binding ribs 42.
Preferably, the single-layer anti-cracking reinforcing mesh sheets 3 connected with the upper end surface and the lower end surface of the bearing section steel 4 and the groove body of the bearing section steel 4 are additionally connected through grouting materials 43,
meanwhile, the lower end face of the bearing base 1 is connected with the upper end face of a support pillar arranged on the side wall of the guide hole and is connected through a pre-buried hook; the single-layer anti-cracking reinforcing mesh 3 on the upper end surface of the bearing section steel 4 is connected with the top of the pilot hole to support and protect the pilot hole, and simultaneously, the stability of the support is improved through the bearing section steel groove body and the single-layer anti-cracking reinforcing mesh 3 at the bottom of the bearing section steel, and the stability and the construction convenience of a plain concrete structure are improved,
it is emphasized that the bearing lead screw 2 comprises a bottom support 21, a universal hinge 22, a positioning block 23, a driving lead screw 24, a pressure sensor 25, a level gauge 26 and a connecting terminal 27, wherein the bottom support 21 is of a groove-shaped structure with a cross section of '20866', the upper end surface of the bottom support is connected with and coaxially distributed on the lower end surface of the driving lead screw 24, the lower end surface of the bottom support is hinged with the upper end surface of the bearing base 1 through the universal hinge 22, 30% -80% of the height of the universal hinge 22 is partially embedded in a groove body of the bottom support 21, the upper end surface of the driving lead screw 24 is in sliding connection with and coaxially distributed among the positioning blocks 23 through a bearing 28, the bottom of the positioning block 23 is embedded in the positioning hole 5 and is connected with the bearing section steel 4 through the positioning hole 5, the outer side surface of the positioning block 23 is connected with a single-layer anti-cracking steel mesh 3 through a through hole wall of a through hole 6, the level gauge 26 is embedded in the upper end surface of the bottom support 21, the upper end surface of the positioning block 23, the pressure sensor 25 is embedded in the upper end surface of the positioning block 23 and coaxially distributed among the positioning block 23, the pressure sensor 25 abuts against the bottom of the positioning hole 5, the positioning block 24, the pressure sensor 25 and the level gauge 26 are electrically connected with the connecting terminal 27, and at least one terminal 27 are embedded in the connecting terminal 27 and embedded in the outer side surface of the bottom support 21.
In construction, on one hand, the working angle and position of the bottom support and the driving screw rod connected with the bottom support can be flexibly adjusted through the universal hinge, and the working angle is accurately positioned through the level gauge; on the other hand, in the construction process and maintenance management, the pressure sensor, the level gauge and the driving screw are connected with external control equipment through the wiring terminal, on one hand, the stress state of the driving screw during current working operation is detected through the pressure sensor, and the inclination amount of the current screw inclining due to stress, geological subsidence and the like is obtained through the inclination angle sensor, so that accurate supporting data is obtained, the stretching amount of the driving screw can be adjusted according to the supporting data, the purpose of adjusting the supporting acting force of the driving screw is achieved, and the requirement of accurate supporting operation of a pilot tunnel or a tunnel body is met.
Furthermore, the distance between the lower end surface of the bottom support 21 and the base of the bearing bottom 1 is not less than 10 mm, and the lower end surface of the bottom support is connected with the base through at least three springs 29 uniformly distributed around the axis of the bottom support 21.
Compared with the traditional construction method, the construction method has the advantages of simple structure, easiness in material taking, small material loss, flexibility and convenience in operation, good universality and small physical loss during operation, meets the requirement on construction deformation, effectively prevents the structure from deforming, can effectively detect the stress state of the supporting operation, and further improves the construction work precision, the convenience and the precision of daily detection and maintenance.
It will be appreciated by persons skilled in the art that the present invention is not limited by the embodiments described above. The foregoing embodiments and description have been presented only to illustrate the principles of the invention. Various changes and modifications can be made to the invention without departing from the spirit and scope of the invention. Such variations and modifications are intended to be within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A method for building a micro-deformation close-contact hard-contact supporting roof of an underpass extension subway station is characterized by comprising the following steps of:
s1, pilot hole construction, namely, two pilot holes PBA construction methods with small influence on the existing line are adopted for construction, side piles are formed by machinery, the section of a lower penetrating section is a rectangular section, and the existing tunnel bottom plate of the subway line is flatly covered; firstly, arranging a row of lead screw supporting mechanisms in a side pilot tunnel and a middle cavern respectively, then jacking the inner skin of a primary support through I-shaped steel to be tightly propped against a bottom plate of an existing structure, and jacking the existing structure through adjusting a pre-stress of a lead screw of the side pilot tunnel to ensure no void; the screw rod of the middle chamber has no pre-stress; finally, a plain concrete structure is arranged on the upper layer of the top plate of the pilot tunnel, the I-shaped steel supported above the lead screw is left in the plain concrete structure, a single-layer anti-cracking reinforcing steel net piece is arranged on the upper layer in the plain concrete structure, and the top surface of the primary support is closely attached to the existing station structure through the plain concrete structure and the single-layer anti-cracking reinforcing steel net piece;
s2, grouting reinforcement operation, namely performing deep hole grouting on the periphery and the tunnel face of the pilot tunnel before excavation, wherein the grouting range is 1.8-2.5 meters outwards and 0.3-1 meter inwards of the excavation outline; grouting the base of the pilot tunnel in time after the pilot tunnel is closed into a ring, and performing side pile construction after the base grouting reaches the strength; during construction, the top of a crown beam is closely attached to the inner skin of an upper pilot tunnel, 1 rear grouting pipe is reserved at intervals of 0.8-1.5 m at the back of the crown beam, and meanwhile, the post grouting effect is performed on the fender post; grouting after primary support is additionally carried out in the primary support construction process of the pilot tunnel and the buckling arch;
and S3, monitoring points are distributed, a plurality of detection points are arranged and the monitoring frequency is encrypted in the primary support construction process, the construction operation state and the stress state are detected through the detection points, and the construction parameters are adjusted in time according to the monitoring result.
2. The method for constructing the close-contact hard-contact supporting roof of the micro-deformation of the underpass extension subway station as claimed in claim 1, wherein: in the step S1, a temporary middle clapboard and a middle partition wall are additionally arranged when the soil body under the primary support arch and the arch is excavated, and the settlement caused by the dismantling of the middle clapboard and the middle partition wall is overcome by adjusting the supporting acting force of a screw rod supporting mechanism when the middle clapboard and the middle partition wall are dismantled.
3. The method for constructing the low-pass expanded subway station micro-deformation close-contact hard-contact supporting roof as claimed in claim 1, wherein the method comprises the following steps: in the step S1, when a plain concrete structure is constructed, in order to ensure the compactness of concrete pouring on two sides of the I-shaped steel, the section steel can be subjected to grouting holes at a certain distance along the longitudinal direction.
4. The method for constructing the low-pass expanded subway station micro-deformation close-contact hard-contact supporting roof as claimed in claim 1, wherein the method comprises the following steps: in the step S1, the screw support mechanism includes a bearing base, a bearing screw, a single-layer anti-cracking reinforcing steel bar mesh and a bearing section steel, the bearing section steel is 1-2, the upper end surface and the lower end surface of the bearing section steel are connected with a plurality of single-layer anti-cracking reinforcing steel bar meshes, the single-layer anti-cracking reinforcing steel bar meshes and the bearing section steel are distributed in parallel along the axis direction of the bearing section steel, a plurality of locating holes are uniformly distributed on the lower end surface of the bearing section steel along the axis, each locating hole is connected with the upper end surface of one bearing screw and coaxially distributed, the single-layer anti-cracking reinforcing steel bar meshes corresponding to the locating holes are provided with through holes, the single-layer anti-cracking reinforcing steel bar meshes are wrapped outside the bearing screw through the through holes and connected with the bearing screw, the lower end surface of the bearing screw is connected with the bearing base and coaxially distributed between the bearing base, the bearing base is of a plate-shaped structure with a rectangular cross section, the lower end surface of the bearing base is provided with at least one embedded hook, and the embedded hook and the lower end surface of the bearing base forms an included angle of 45-90 degrees.
5. The underground railway station micro-deformation close-contact hard-contact supporting top structure as claimed in claim 4, wherein: the bearing section steel is any one of I-shaped section steel and V-21274, the cross section of the bearing section steel is I-shaped, a plurality of connecting buckles are uniformly distributed on the lower end face of the upper end face of the bearing section steel, the connecting buckles are uniformly distributed along the axial direction of the bearing section steel, the connecting buckles are connected with the single-layer anti-cracking reinforcing steel bar net sheets through binding bars, and the single-layer anti-cracking reinforcing steel bar net sheets arranged on the upper end face and the lower end face of the bearing section steel are connected through a plurality of binding bars.
6. The underground railway station micro-deformation close-contact hard-contact supporting top structure as claimed in claim 4, wherein: the single-layer anti-cracking steel bar net pieces connected with the upper end face and the lower end face of the bearing section steel and the groove body of the bearing section steel are additionally connected through grouting materials.
7. The underground railway station micro-deformation close-contact hard-contact supporting top structure as claimed in claim 4, wherein: the bearing lead screw comprises a bottom support, a universal hinge, a positioning block, a driving lead screw, a pressure sensor, a level gauge and a wiring terminal, wherein the bottom support is of a 2086666cross-section-shaped groove installation structure, the upper end face of the bottom support is connected with the lower end face of the driving lead screw and coaxially distributed, the lower end face of the bottom support is hinged with the upper end face of a bearing base through the universal hinge, 30% -80% of the height of the universal hinge is embedded in a bottom support groove body, the upper end face of the driving lead screw is in sliding connection with the positioning block through a bearing and coaxially distributed, the bottom of the positioning block is embedded in the positioning hole and connected with bearing section steel through the positioning hole, the outer side face of the positioning block is further connected with a single-layer anti-cracking reinforcing steel net piece through a through hole wall, the level gauge is embedded in the upper end face of the bottom support, the pressure sensor is embedded in the upper end face of the positioning block and coaxially distributed with the positioning block, the pressure sensor is abutted against the bottom of the positioning hole, the driving lead screw, the pressure sensor and the level gauge are electrically connected with the wiring terminal, and at least one wiring terminal is embedded in the outer side face of the bottom support.
8. The underground subway station micro-deformation close-contact hard-contact supporting roof structure as claimed in claim 7, wherein: the distance between the lower end surface of the bottom support and the bearing base is not less than 10 mm, and the lower end surface of the bottom support and the bearing base are connected through at least three springs uniformly distributed around the axis of the bottom support.
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| CN202210766016.8A CN115341570A (en) | 2022-07-01 | 2022-07-01 | Method for building closely-adhered hard-contact supporting top of underpass extension subway station micro-deformation |
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Application publication date: 20221115 |