CN116517592A - Large-section horsehead door supporting structure of subway tunnel and construction method thereof - Google Patents
Large-section horsehead door supporting structure of subway tunnel and construction method thereof Download PDFInfo
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- CN116517592A CN116517592A CN202310600429.3A CN202310600429A CN116517592A CN 116517592 A CN116517592 A CN 116517592A CN 202310600429 A CN202310600429 A CN 202310600429A CN 116517592 A CN116517592 A CN 116517592A
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- surrounding rock
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- 230000008093 supporting effect Effects 0.000 title claims abstract description 108
- 238000010276 construction Methods 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 90
- 239000010959 steel Substances 0.000 claims abstract description 90
- 241001023788 Cyttus traversi Species 0.000 claims abstract description 65
- 239000011435 rock Substances 0.000 claims abstract description 63
- 239000011378 shotcrete Substances 0.000 claims abstract description 34
- 239000004567 concrete Substances 0.000 claims abstract description 18
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000002787 reinforcement Effects 0.000 claims abstract description 10
- 230000002452 interceptive effect Effects 0.000 claims abstract description 3
- 238000009412 basement excavation Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- 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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a large-section horsehead door supporting structure of a subway tunnel and a construction method thereof, wherein the supporting structure comprises a surrounding rock supporting structure, a grid steel frame and an anchor rod, wherein the grid steel frame is configured with a horsehead door position, and the anchor rod is inserted into the inner side of the surrounding rock and is used for interfering surrounding rock deformation in the process of converting a stress system; and the temporary supporting structure is configured with a transverse supporting beam, a longitudinal supporting column and an inclined strut which are connected in the surrounding rock supporting structure and is used for supporting the surrounding rock and the supporting structure of the tunnel. Adopting surrounding rock of the horsehead door section for advanced reinforcement, and breaking horsehead door concrete to form a horsehead door opening; setting a sprayed concrete leveling layer, paving a reinforcing mesh after initial setting of concrete, and erecting a grid steel frame; the grid steel frame unit is connected with the anchor rod; a temporary supporting structure is arranged in the horsehead door, and a sprayed concrete supporting layer is arranged. The method avoids great construction risks such as deformation of the supporting structure, collapse of the tunnel portal and the like when the horse head door of the transverse channel of the large-section tunnel is broken, ensures the stable structure during construction and ensures the safety of operators.
Description
Technical Field
The invention relates to the technical field of subway tunnel construction, in particular to a large-section horsehead door supporting structure of a subway tunnel and a construction method thereof.
Background
When the underground excavation method is adopted to perform subway tunnel construction, after the construction of the working vertical shaft and the transverse passage is completed, a horsehead door is required to be subjected to construction. When the horse head door is broken, the original anchor spraying protection wall systems such as arches, concrete and the like in the excavation outline of the horse head door are required to be chiseled. The horse head door is used as the junction of the transverse channel and the tunnel, the stress state is very complex, and the horse head door breaks the construction to destroy the original stress state of the tunnel, so that a series of problems such as instability, collapse and the like of surrounding rock are easily generated.
In order to solve the above problems in the prior art, steel arches are generally erected at the horsehead door and reinforced by sprayed concrete. The structural integrity of the supporting mode is poor, and the influence range of the large-section horsehead door breaking construction is large, so that the stress concentration is serious. Due to the influence of subsequent construction, surrounding rock is disturbed for many times, deformation of an original structure and subsidence of a vault can be caused, even structural damage is caused when serious, collapse of a hole can be caused, life safety of site constructors is threatened, and serious consequences and huge economic loss are brought.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide the horsehead door supporting structure and the construction method thereof, which can avoid serious construction risks such as supporting structure deformation, cave collapse and the like when the horsehead door of the transverse channel of the large-section tunnel is broken, ensure the stable structure during construction and ensure the safety of operators.
The invention is realized by the following technical scheme.
According to one aspect of the present invention, there is provided a large section horsedoor supporting structure for a subway tunnel, comprising:
the surrounding rock supporting structure is provided with a grid steel frame at the position of a horsehead door and an anchor rod inserted into the inner side of the surrounding rock and is used for interfering surrounding rock deformation in the process of converting a stress system;
and the temporary supporting structure is configured with a transverse supporting beam, a longitudinal supporting column and an inclined strut which are connected in the surrounding rock supporting structure and is used for supporting the surrounding rock and the supporting structure of the tunnel.
According to an exemplary embodiment of the present invention, a grid steel frame of a surrounding rock supporting structure is formed by connecting a plurality of grid steel frame units and grid connection plates arranged between adjacent steel frame units, and the grid steel frame is consistent with the shape of a cross section of a horse head door of a tunnel surrounding rock.
According to an exemplary embodiment of the present invention, an anchor rod inserted into the inside of the surrounding rock is connected to the outside of the grid steel frame and anchored in the surrounding rock of the tunnel along the outer circumference of the grid steel frame.
According to an exemplary embodiment of the invention, the surrounding rock support structure further comprises a sprayed concrete and a reinforcing mesh arranged outside the grid steel frame, the sprayed concrete comprising a sprayed concrete screed arranged between the reinforcing mesh and the inner wall of the surrounding rock and a sprayed concrete sheath covering the inner side of the grid steel frame.
According to an exemplary embodiment of the invention, the longitudinal support columns of the temporary support structure are supported on the bottom floor of the horsehead door; the upper part of the longitudinal support column is horizontally provided with a transverse support beam, and an inclined strut is arranged above the transverse support beam.
According to an exemplary embodiment of the present invention, both ends of the cross support beam and the top of the diagonal braces are connected to the grid steel frame through telescopic support bars.
According to an exemplary embodiment of the present invention, a connector for connecting the temporary support structure assembly is provided in the grid steel frame, and the connector is connected to the telescopic support rod.
According to an exemplary embodiment of the present invention, the cross support beam and the longitudinal support column, and the cross support beam and the diagonal support are all connected by bolts.
According to an exemplary embodiment of the present invention, the longitudinal support column employs a single hydraulic support column.
According to another aspect of the invention, a construction method of the large-section horsehead door supporting structure of the subway tunnel is provided, which comprises the following steps:
s1, determining the opening position of a horse head door in a vertical shaft transverse channel;
s2, surrounding rock of the horsehead door section is reinforced in advance;
s3, breaking concrete at the position of the horsehead door to form a horsehead door opening;
s4, setting a sprayed concrete leveling layer on the inner side of the surrounding rock;
s5, after initial setting of sprayed concrete, paving a reinforcing mesh and erecting a grid steel frame;
s6, anchoring bolts are arranged and connected at corresponding positions of each grid steel frame unit;
s7, arranging a temporary supporting structure in the horsehead door, fixing a transverse supporting beam on a longitudinal supporting column, and connecting the transverse supporting beam and a diagonal bracing with a telescopic supporting rod to be connected with a grid steel frame;
and S8, after the temporary supporting structure is installed, spraying concrete to enable the grid steel frames in the section to be closed into rings, and forming a concrete supporting layer for coating the grid steel frames after the concrete slurry is solidified.
According to an exemplary embodiment of the present invention, in S1, a white paint is used to draw a profile of an excavation surface of a shaft and a clearance profile after molding when measuring and positioning in the shaft.
According to the exemplary embodiment of the invention, in S2, surrounding rock advanced reinforcement of the horsehead door section is reinforced by grouting in a greenhouse, and the grouting reinforcement range is a cross-channel horsehead door opening arch part.
According to an exemplary embodiment of the present invention, in S3, the horsehead door is broken by a slitting method; and during the breaking, the concrete in the range of the outline of the horsehead door excavation is broken from top to bottom, the transverse channel grid steel frame and the core rock mass are reserved, and the grid steel frame in the clearance outline is cut off.
According to the exemplary embodiment of the present invention, in S5, the reinforcing mesh is fixed to the surrounding rock with the iron wire, and the reinforcing mesh must be smoothly installed without loosening.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. according to the invention, the surrounding rock supporting structure is arranged on the inner side of the surrounding rock, and the temporary supporting structure is arranged in the horsehead door, so that continuous supporting force can be provided for the surrounding rock in the excavation process of the horsehead door, and the deformation of the surrounding rock can be effectively controlled in the conversion process of the horsehead door position stress system. The supporting structure has uniform strength and good integrity, and can ensure the stability and safety of the surrounding rock and the supporting structure in use.
2. The temporary supporting structure used by the invention is an assembled structure, can be installed at any time in use, is simple to use, convenient to construct, low in supporting cost, convenient to adjust in the using and installing process, convenient to detach after supporting is finished, and can be used for multiple times.
3. The longitudinal support columns adopt single hydraulic support columns, and the ends of the transverse support beams and the inclined support columns are provided with telescopic support rods, so that the length of each support can be adjusted according to the section condition of the bridge door at the construction site, the construction quality can be effectively improved, and the safety of the structure is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and do not limit the invention, and together with the description serve to explain the principle of the invention:
FIG. 1 is a schematic structural view of a large section horsehead door support structure for a subway tunnel according to the present invention;
fig. 2 is an enlarged view at a in fig. 1.
In the figure: 1 is a grid steel frame, 2 is an anchor rod, 3 is a reinforcing mesh, 4 is a sprayed concrete leveling layer, 5 is a sprayed concrete supporting layer, 6 is a grid connecting plate, 7 is a connecting piece, 8 is a longitudinal supporting column, 9 is a transverse supporting beam, 10 is an inclined strut, 11 is a telescopic supporting rod, and 12 is a greenhouse.
Detailed Description
The present invention will now be described in detail with reference to the drawings and the specific embodiments thereof, wherein the exemplary embodiments and descriptions of the present invention are provided for illustration of the invention and are not intended to be limiting.
As shown in fig. 1 and 2, the embodiment of the invention provides a large-section horsehead door supporting structure of a subway tunnel, which comprises a surrounding rock supporting structure arranged on the inner side of surrounding rock and a temporary supporting structure arranged in the horsehead door. The surrounding rock supporting structure comprises a grid steel frame 1, an anchor rod 2, a reinforcing mesh 3 and sprayed concrete, and is used for ensuring that a stable load system is formed with surrounding rock after the horsehead door is broken; the temporary support structure comprises a longitudinal support column 8, a transverse support beam 9 and a diagonal bracing 10, and is arranged between the surrounding rock support structure and the bottom of the horsehead door, so that auxiliary support can be formed for the surrounding rock support structure, and the stability of the whole structure is ensured.
The grid steel frame 1 is arranged at the opening of the horse head door, the grid steel frame 1 is formed by connecting a plurality of grid steel frame units with grid connecting plates 6 arranged between adjacent steel frame units, and the shape of the grid steel frame 1 is consistent with that of the cross section of the horse head door of the tunnel surrounding rock. The reinforcing mesh 3 is arranged on the outer side of the grid steel frame 1 and welded with the grid steel frame 1. Every grid steelframe unit is last all to be provided with the stock, and a plurality of stock 2 welds in grid steelframe 1 outside to anchor in the tunnel country rock body along grid steelframe 1 periphery, connect through the welding between stock and the grid steelframe unit.
The sprayed concrete comprises a sprayed concrete leveling layer 4 arranged between the reinforcing mesh 3 and the inner wall of the surrounding rock and a sprayed concrete supporting layer 5 covered on the inner side of the grid steel frame 1. The sprayed concrete can be filled in the gaps between the grid steel frame 1 and the surrounding rock and can be connected with the grid steel frame 1 and the anchor rods 2 into a whole, so that the overall supporting effect is improved.
A connecting piece 7 for connecting the temporary supporting structure component is arranged in the grid steel frame 1, and the grid steel frame 1 and the temporary supporting structure can be connected together through the connecting piece 7.
The vertical support column 8 of the temporary support structure adopts a single hydraulic support column and is supported on the ground at the bottom of the horsehead door, the upper part of the vertical support column 8 is horizontally provided with a transverse support beam 9, an inclined strut 10 is arranged above the transverse support beam 9, and two ends of the transverse support beam 9 and the top of the inclined strut 10 are connected with a connecting piece 7 arranged on the grid steel frame 1 through a telescopic support rod 11.
In the embodiment, the grid steel frame 1 is composed of seven grid steel frame units in total, and all the parts are connected through the grid connecting plate 6 and bolts. The grid steel frame is prefabricated by section steel and reinforcing steel bars according to the shape of the cross section of the horsehead door and the construction requirement on site. The processed grid steel frame should be stored in batches and used in time in sections, and the anti-corrosion and rust-proof measures are made.
In the embodiment, the grid steel frame 1 is prefabricated by adopting angle steel with the specification of 140 x 90 x 10 and steel bars with the specifications of HPB300 grade phi 8, HRB400 grade phi 14 and phi 25; the processed grid steel frame 1 should be stored in sections and batches and used in time, and anti-corrosion and rust-proof measures are made.
In this embodiment, all be provided with stock 2 on every grid steelframe unit, stock 2 is used for inserting in the rock mass of tunnel lateral wall, and stock 2 adopts phi 42 steel pipe to make, and stock 2's length is 3m, and the overall length annotates the cement thick liquid, and the water-cement ratio of thick liquid is 1.0. The anchor rod 2 and the grid steel frame 1 are firmly welded by using U-shaped phi 22 steel bars.
In this embodiment, the sprayed concrete screed 4 is arranged inside the surrounding rock, and the sprayed concrete screed is 30-40 mm thick, preferably 35mm thick, by adopting C25 sprayed concrete.
In this embodiment, the sprayed concrete supporting layer 5 is disposed inside the grid steel frame 1, and the sprayed concrete is C25 sprayed concrete, and the overall thickness of the sprayed concrete supporting layer 5 is 250-350mm, preferably 300mm.
In the embodiment, the reinforcing mesh 3 is arranged between the sprayed concrete leveling layer 4 and the grid steel frame 1, the reinforcing mesh 3 is made of HPB300 grade phi 8 reinforcing steel bars, the lap joint length of the reinforcing mesh is not less than 150mm, and the interval is preferably 150 multiplied by 150mm; the surface of the steel bar should not be cracked, greasy dirt, granular or flaky rust.
In this embodiment, the longitudinal support column 8 is a single hydraulic support column, and the upper part of the longitudinal support column 8 can be connected with the transverse support beam 9 by bolts. The number of the longitudinal support columns 8 is two according to construction requirements.
In the embodiment, the transverse supporting beam 9 is made of H12-shaped steel, the two ends of the transverse supporting beam 9 are respectively provided with a telescopic supporting rod 11, and the telescopic supporting rods 11 are connected with the grid steel frame 1 through bolts by connecting pieces 7 reserved on the grid steel frame 1.
In this embodiment, the diagonal brace 10 is made of H12-shaped steel, one end of the diagonal brace 10 is provided with a telescopic support rod 11, and the telescopic support rod 11 is connected with the grid steel frame 1 through a connecting piece 7 reserved on the grid steel frame 1. The other end of the diagonal brace 10 is connected with the transverse supporting beam 9 through bolts, and the diagonal brace 11 is arranged in two according to construction requirements.
The embodiment of the invention provides a construction method of a large-section horsehead door supporting structure of a subway tunnel, which comprises the following steps:
step 1, measuring and positioning in a vertical shaft transverse channel, and determining the opening position of a horse head door; when measuring and positioning in a vertical shaft transverse channel, drawing a transverse channel excavation surface contour line and a formed clearance contour line by using white paint;
step 2, adopting a big pipe shed 12 to carry out advanced reinforcement on surrounding rocks of the horsehead door section; grouting reinforcement is adopted for surrounding rock advanced reinforcement of the horsehead door section, the grouting reinforcement range is that a cross channel horsehead door is provided with a hole arch part, and the size and the distribution of the greenhouse are determined according to construction requirements;
the surrounding rock of the horsehead gate section is subjected to grouting reinforcement by adopting a big pipe shed 12, the grouting reinforcement range is within 150 degrees of the arch part of the transverse channel horsehead gate opening, the length of the big pipe shed is 15m, the circumferential spacing is 0.4m, the horizontal inclination angle is 1-2 degrees, Q235 steel pipes with phi 108 multiplied by 8mm are adopted for manufacturing, cement slurry is injected, and the slurry water-cement ratio is 1.0. The grouting sequence is in principle performed by low holes and high holes. Grouting final pressure is 0.5MPa, and stabilizing pressure for 15 minutes;
step 3, breaking concrete at the position of the horsehead door to form a horsehead door opening; when the horsehead door is broken, a slitting method is adopted, and the slitting width is 40-60 cm, preferably 50cm; during the breaking, the concrete in the range of the outline of the horsehead door excavation is broken from top to bottom, a horizontal channel grid steel frame and a core rock mass are reserved, and the grid steel frame in the clearance outline is cut off;
step 4, setting a sprayed concrete leveling layer 4 on the inner side of the surrounding rock, wherein the sprayed concrete is 40-60mm in thickness, and preferably 35mm;
step 5, after the sprayed concrete is initially set, paving a reinforcing mesh 3 and erecting a grid steel frame 1; the steel bar net piece is fixed on surrounding rock by iron wires, and the steel bar net piece is required to be smooth and cannot be loosened when being installed, so that the quality of the follow-up sprayed concrete is not affected;
step 6, after the erection of the grid steel frame 1 is completed, an anchor rod 2 is arranged at a corresponding position of each grid steel frame unit, and the anchor rods 2 and the grid steel frames 1 are welded together;
step 7, arranging a temporary supporting structure in the horsehead door; the transverse supporting beams 9 are fixed on the tops of the longitudinal supporting beams 8, the transverse supporting beams 9 are lifted to the target height through the longitudinal supporting beams 8, and the telescopic supporting rods 11 at the two ends of the transverse supporting beams 9 are connected with the connecting pieces 7 reserved on the grid steel frame 1. The transverse supporting beam 9 and the longitudinal supporting column 8 and the transverse supporting beam 9 and the diagonal bracing 10 are connected through bolts; then, a diagonal brace 10 is arranged on the upper part of the transverse supporting beam 9, a telescopic supporting rod 11 at one end of the diagonal brace 10 is connected with a connecting piece 7 reserved on the grid steel frame 1, and the other end of the diagonal brace is connected with the transverse supporting beam 9;
and 8, after all temporary supports are installed, spraying concrete with the thickness of 250-350mm, preferably 300mm, so that the grid steel frame 1 in the section is closed into a ring, and forming a concrete supporting layer 5 coating the grid steel frame 1 after the concrete slurry is solidified.
The structure of the invention maintains the original stress state of the tunnel, avoids the phenomena of instability, collapse and the like of surrounding rock, ensures the stable structure during construction, ensures the safety of operators and is an effective scheme for subway tunnel construction.
The invention is not limited to the above embodiments, and based on the technical solution disclosed in the invention, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the invention.
Claims (10)
1. The utility model provides a subway tunnel big section horse's head door supporting construction which characterized in that includes:
the surrounding rock supporting structure is provided with a grid steel frame at the position of a horsehead door and an anchor rod inserted into the inner side of the surrounding rock and is used for interfering surrounding rock deformation in the process of converting a stress system;
and the temporary supporting structure is configured with a transverse supporting beam, a longitudinal supporting column and an inclined strut which are connected in the surrounding rock supporting structure and is used for supporting the surrounding rock and the supporting structure of the tunnel.
2. The large-section horsedoor supporting structure of the subway tunnel according to claim 1, wherein the grid steel frame of the surrounding rock supporting structure is formed by connecting a plurality of grid steel frame units and grid connecting plates arranged between the adjacent steel frame units, and the grid steel frame is consistent with the shape of the cross section of the horsedoor of the tunnel surrounding rock.
3. The large-section horsedoor supporting structure of the subway tunnel according to claim 1, wherein the anchor rods inserted into the inner sides of the surrounding rocks are connected to the outer sides of the grid steel frames and are anchored in the surrounding rocks of the tunnel along the outer peripheries of the grid steel frames.
4. The subway tunnel large-section horsehead door supporting structure according to claim 1, wherein the surrounding rock supporting structure further comprises a reinforcing mesh and sprayed concrete arranged outside the grid steel frame, and the sprayed concrete comprises a sprayed concrete leveling layer arranged between the reinforcing mesh and the inner wall of the surrounding rock and a sprayed concrete supporting layer covered on the inner side of the grid steel frame.
5. The large section horsedoor support structure of the subway tunnel according to claim 1, wherein the longitudinal support columns of the temporary support structure are supported on the ground at the bottom of the horsedoor; the upper part of the longitudinal support column is horizontally provided with a transverse support beam, and an inclined strut is arranged above the transverse support beam.
6. The large-section horsehead door supporting structure of the subway tunnel according to claim 5, wherein two ends of the transverse supporting beam and the top of the diagonal bracing are connected with the grid steel frame through telescopic supporting rods;
the grid steel frame is internally provided with a connecting piece for connecting the temporary supporting structure component, and the connecting piece is connected with the telescopic supporting rod.
7. The large-section horsedoor supporting structure of the subway tunnel according to claim 5, wherein the transverse supporting beams and the longitudinal supporting columns and the transverse supporting beams and the diagonal braces are connected through bolts.
8. The large section horsedoor support structure of subway tunnel according to claim 5, wherein the longitudinal support column is a single hydraulic support column.
9. A method of constructing a large section horsedoor support structure for a subway tunnel as claimed in any one of claims 1 to 8, comprising:
s1, determining the opening position of a horse head door in a vertical shaft transverse channel;
s2, surrounding rock of the horsehead door section is reinforced in advance; modification of
S3, breaking concrete at the position of the horsehead door to form a horsehead door opening;
s4, setting a sprayed concrete leveling layer on the inner side of the surrounding rock;
s5, after initial setting of sprayed concrete, paving a reinforcing mesh and erecting a grid steel frame;
s6, anchoring bolts are arranged and connected at corresponding positions of each grid steel frame unit;
s7, arranging a temporary supporting structure in the horsehead door, fixing a transverse supporting beam on a longitudinal supporting column, and connecting the transverse supporting beam and a diagonal bracing with a telescopic supporting rod to be connected with a grid steel frame;
and S8, after the temporary supporting structure is installed, spraying concrete to enable the grid steel frames in the section to be closed into rings, and forming a concrete supporting layer for coating the grid steel frames after the concrete slurry is solidified.
10. The construction method of the large-section horsedoor supporting structure of the subway tunnel according to claim 9, wherein in the step S2, surrounding rock of the horsedoor section is reinforced in advance by grouting through a greenhouse, and the grouting reinforcement range is a cross-channel horsedoor opening arch part;
s3, breaking the horsehead door by adopting a slitting method; and during the breaking, the concrete in the range of the outline of the horsehead door excavation is broken from top to bottom, the transverse channel grid steel frame and the core rock mass are reserved, and the grid steel frame in the clearance outline is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310600429.3A CN116517592A (en) | 2023-05-25 | 2023-05-25 | Large-section horsehead door supporting structure of subway tunnel and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310600429.3A CN116517592A (en) | 2023-05-25 | 2023-05-25 | Large-section horsehead door supporting structure of subway tunnel and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116517592A true CN116517592A (en) | 2023-08-01 |
Family
ID=87390312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310600429.3A Pending CN116517592A (en) | 2023-05-25 | 2023-05-25 | Large-section horsehead door supporting structure of subway tunnel and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116517592A (en) |
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2023
- 2023-05-25 CN CN202310600429.3A patent/CN116517592A/en active Pending
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