CN112576259B - Main body auxiliary construction method and structure for station by arch cover method - Google Patents
Main body auxiliary construction method and structure for station by arch cover method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 40
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 84
- 238000009412 basement excavation Methods 0.000 claims abstract description 82
- 239000011435 rock Substances 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 116
- 239000010959 steel Substances 0.000 claims description 116
- 238000005192 partition Methods 0.000 claims description 19
- 238000013461 design Methods 0.000 claims description 9
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- 238000005516 engineering process Methods 0.000 description 2
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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
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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
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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Abstract
The invention provides a method and a structure for constructing a station by an arch cover method from a main body to an auxiliary body, wherein a cast-in-place beam system consisting of an arch foot longitudinal beam, a conversion ring beam, a conversion longitudinal beam and a support column beam is also arranged besides a first supporting structure, a second supporting structure, a third supporting structure and a fourth supporting structure, in the system, stratum load can be transmitted to the arch foot longitudinal beam and the conversion ring beam through the first supporting structure, the second supporting structure, the fourth supporting structure and the like, the arch foot longitudinal beam transmits the load to a rock stratum, the conversion ring beam transmits the load to the conversion longitudinal beam, the conversion longitudinal beam transmits the load to the support column beam, and the support column beam is supported by the ground of an auxiliary initial section D, so that the large load can be borne, the conversion longitudinal beam and the support column beam are stably supported, the stability of the junction of the auxiliary initial section D and a rear excavation chamber B is ensured, and the strength of the whole stress system is ensured, the stable stress conversion is realized, and the safety of construction conversion is improved.
Description
Technical Field
The invention relates to the technical field of subway construction, in particular to a method and a structure for auxiliary construction from a main body of an arch cover method station.
Background
The bedrock burial depth of partial urban areas of China is shallow, so that the problems of pipeline relocation, greening migration, traffic jam and the like caused by conventional open excavation or cover excavation construction are solved, and the use frequency of the large-span underground excavation construction method for urban rail transit is higher and higher; limited by the buried depth of a line and the lifting height of a station building, a major structure of a large-span underground excavation tunnel is located in a rock stratum with a soft upper part and a hard lower part, namely a vault is located in strongly weathered and moderately weathered rocks, a vault foot is located in moderately weathered or slightly weathered rocks, and a major part of the major structure is located in moderately weathered and slightly weathered rocks.
The traditional construction method of the large-span underground excavation tunnel comprises a double-side-wall pit guiding method, a hole pile (column) method and the like, but with the development of underground excavation technology, an arch cover method which integrates the design concepts of arch bridges and a subway cover excavation sequential construction method is adopted in urban subways such as Qingdao, Chongqing and Guiyang on a large scale. The key to the success of the arch cover method construction is the stability of the arch springing. The common double-layer primary support arch cover method station needs to be opened from a main tunnel of the station to enter auxiliary construction, and because the opening position is located at the arch foot position of the arch cover, stress conversion is needed in the opening process, a stress system is complex, certain risks exist, and the double-layer primary support arch cover method station is a key node for ensuring the smooth implementation of the arch cover method.
At present, steel frames are generally adopted as supports at junctions where main bodies enter the auxiliary bodies, for example, CN110905524A is a method for excavating and supporting subway station tunnels by adopting underground excavation construction channels, only door-shaped steel frames are adopted for supporting, in addition, CN107975383A discloses an excavation and supporting construction method for T-shaped intersections of underground caverns, the invention application with application number 201910787403.8 discloses a construction method for enlarging arch feet and primarily supporting arch covers, and steel supporting structures are adopted for supporting intersections of main tunnels and supporting tunnels. The patent further mentions a construction scheme of entering the main hole, and does not mention a scheme of entering the auxiliary body by opening the side surface in the main hole excavating process.
In the tunnel main tunnel construction of a soft rock stratum, concrete cross beams are arranged at two ends of an arch foot in part of the prior art and are used for reinforcing the rock stratum, for example, the invention patent with the application number of 201811601157.4 discloses an arch foot reinforcing structure of a subway station underground excavated by an arch cover method, which comprises a first layer of arch cover support, a second layer of arch cover support, arch foot piles and arch foot longitudinal beams, wherein the first layer of arch cover support and the second layer of arch cover support are sequentially arranged above a secondary lining of the subway station, the arch foot piles are arranged at the arch feet at the left side and the right side of the second layer of arch cover support, and the arch foot longitudinal beams are connected with the arch foot piles into a whole; the arch foot pile body is arranged along the tangent line of the arch foot; the arch foot pile consists of a section steel framework and fine aggregate concrete poured in a steel wall and a pile hole of the section steel framework; and the arch foot longitudinal beams are longitudinally arranged on the left side and the right side of the second layer of arch cover support along the subway station. The arch springing longitudinal beam in the construction method is a conventional horizontal beam, can only reinforce rock stratum and improve the strength of the rock stratum, thereby strengthening the stability of support, and the technology is used for excavating the main body and does not relate to out-of-tunnel stress conversion.
Disclosure of Invention
The invention aims to provide a method and a structure for constructing an arch cover method station from a main body, which can stably support an arch cover, realize stable stress conversion and improve safety.
The technical scheme adopted by the invention for solving the technical problems is as follows: the auxiliary construction method for the arch cover method station from the main body comprises
S1, excavating a first excavation chamber A on an upper step C of the main tunnel, wherein the first excavation chamber A is positioned on one side far away from the attachment, and a first supporting structure and a vertical middle partition wall are erected in the first excavation chamber A;
s2, excavating a back-excavation chamber B on the upper step C of the main tunnel, and erecting a second supporting structure in the back-excavation chamber B, wherein the second supporting structure is connected with a middle partition wall;
s3, excavating the auxiliary initial section D to a proper length one by one, and erecting a third supporting structure in the auxiliary initial section D;
s4, erecting a fourth supporting structure on the lower surfaces of the first supporting structure and the second supporting structure, wherein one end, far away from the auxiliary initial section D, of the fourth supporting structure extends to the arch foot and is connected with arch foot longitudinal beam steel bars, the other end of the fourth supporting structure has a distance to the auxiliary initial section D, conversion ring beam steel bars are arranged in the distance, the lower ends of the conversion ring beam steel bars are connected with the conversion longitudinal beam steel bars, and vertical pillar beam steel bars are arranged at two ends of the conversion longitudinal beam steel bars;
s5, pouring arch springing longitudinal beams, conversion ring beams, conversion longitudinal beams and pillar beams;
and S6, after the strength of the arch springing longitudinal beam, the conversion ring beam, the conversion longitudinal beam and the pillar beam reaches the design requirement, dismantling the middle partition wall.
Further, in step S3, the auxiliary initial segment D has a rectangular cross section.
Further, in step S3, the excavation depth of the auxiliary initial segment D is 1 m.
Further, in step S3, the third supporting structure includes a plurality of steel-section frames, each of which includes a horizontal top beam and vertical columns at two ends of the top beam, and the length direction of the top beam is arranged along the width direction of the auxiliary initial section D.
Further, in step S1, the first supporting structure includes an arched first primary support steel frame, and after the first primary support steel frame is erected, the first primary support steel frame is sprayed with the first concrete;
in step S2, the second support structure includes an arched second primary support steel frame, one end of the second primary support steel frame near the auxiliary initial section D is connected to a lock leg shell-expanding anchor rod, the lock leg shell-expanding anchor rod is anchored in the rock formation, and after the second primary support steel frame is erected, second concrete is sprayed to the second primary support steel frame.
Further, in steps S1 and S2, connecting ribs are reserved on the first primary support steel frame and the second primary support steel frame;
in step S4, the fourth supporting structure includes a third primary steel frame, and the third primary steel frame is connected to the first primary steel frame and the second primary steel frame via the connecting ribs.
Further, in step S6, after the strength of the arch foot longitudinal beam, the conversion ring beam, the conversion longitudinal beam, and the pillar beam reaches the design requirement, a third concrete is sprayed to the third primary support steel frame, and after the strength of the third concrete reaches the design requirement, the middle partition wall is removed.
An arch cover method station enters an auxiliary construction structure from a main body, and comprises a main body tunnel upper step C, a first excavation chamber A, a second excavation chamber B and an auxiliary initial section D, wherein the first excavation chamber A and the second excavation chamber B are positioned above the main body tunnel upper step C and are separated by a middle partition wall, the auxiliary initial section D is communicated with the second excavation chamber B, the vault of the first excavation chamber A is provided with a first supporting structure, the vault of the second excavation chamber B is provided with a second supporting structure, the top of the auxiliary initial section D is provided with a third supporting structure, the lower surfaces of the first supporting structure and the second supporting structure are provided with a fourth supporting structure, one end of the fourth supporting structure, far away from the auxiliary initial section D, extends to an arch foot and is connected with an arch foot longitudinal beam, one end of the fourth supporting structure, close to the auxiliary initial section D, is connected with a conversion ring beam, the lower end of the conversion ring beam is connected with a conversion longitudinal beam, and the conversion longitudinal beam is positioned at the junction of the auxiliary initial section D and the rear excavation chamber B, and vertical pillar beams are arranged at two ends of the conversion longitudinal beam, and the lower ends of the pillar beams are positioned on the ground of the auxiliary initial section D.
Further, the first support structure comprises an arched first primary support steel frame, and the first primary support steel frame is coated by first concrete; the second supporting structure comprises an arched second primary support steel frame, one end, close to the auxiliary initial section D, of the second primary support steel frame is connected with a lock leg expansion shell type anchor rod, the lock leg expansion shell type anchor rod is anchored in a rock stratum, and the second primary support steel frame is coated by second concrete; the fourth supporting structure comprises a third primary support steel frame, the third primary support steel frame is connected with the first primary support steel frame and the second primary support steel frame through connecting ribs, and the third primary support steel frame is coated by third concrete.
Further, the top surface of the auxiliary initial section D is a horizontal plane, the third supporting structure is a door-shaped bracket composed of a top cross beam and a stand column, and the length direction of the top cross beam is consistent with the width direction of the auxiliary initial section D.
The invention has the beneficial effects that: the invention is provided with a cast-in-place beam system consisting of an arch foot longitudinal beam, a conversion ring beam, a conversion longitudinal beam and a pillar beam besides a first supporting structure, a second supporting structure, a third supporting structure and a fourth supporting structure, in the system, the stratum load can be transmitted to the arch springing longitudinal beam and the conversion ring beam through the first supporting structure, the second supporting structure, the fourth supporting structure and the like, the arch springing longitudinal beam transmits the load to the rock stratum, the conversion ring beam transmits the load to the conversion longitudinal beam, the conversion longitudinal beam transmits the load to the pillar beam, because the pillar beam is supported by the ground of the auxiliary initial section D, the pillar beam can bear a large load, stably support the conversion longitudinal beam and the pillar beam, ensure the stability of the junction of the auxiliary initial section D and the rear excavation chamber B, ensure the strength of the whole stress system, realize stable stress conversion and improve the safety of construction conversion. In addition, the supporting structure does not influence the continuous construction of the main tunnel, and is favorable for guaranteeing the construction efficiency of the main tunnel.
Drawings
FIG. 1 is a schematic view after construction through steps S1 to S3;
FIG. 2 is a schematic view after construction through steps S1 to S5;
FIG. 3 is a side schematic view of FIG. 2;
reference numerals: the main tunnel comprises an underground chamber A which is excavated firstly, an underground chamber B which is excavated later, a main tunnel upper step C, an auxiliary initial section D, a first primary support steel frame 11, a middle partition wall 12, first concrete 13, a second primary support steel frame 21, a locking pin expanding type anchor rod 22, second concrete 23, a connecting rib 24, a top cross beam 31, a stand column 32, a third primary support steel frame 41, a conversion longitudinal beam 42, a pillar beam 43, an arch foot longitudinal beam 44, third concrete 45 and a conversion ring beam 46.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1, 2 and 3, the arch cover method station of the present invention comprises a main body tunnel upper step C, a first excavation chamber a, a second excavation chamber B and an auxiliary initial section D, wherein the first excavation chamber a and the second excavation chamber B are located above the main body tunnel upper step C and are separated by a middle partition wall 12, the auxiliary initial section D is communicated with the second excavation chamber B, the arch crown of the first excavation chamber a is provided with a first support structure, the arch crown of the second excavation chamber B is provided with a second support structure, the auxiliary initial section D is provided with a third support structure, the lower surfaces of the first support structure and the second support structure are provided with a fourth support structure, one end of the fourth support structure far away from the auxiliary initial section D extends to the arch foot and is connected with an arch foot longitudinal beam 44, one end of the fourth support structure near the auxiliary initial section D is connected with a conversion ring beam 46, the lower end of the conversion ring beam 46 is connected with a conversion longitudinal beam 42, the conversion longitudinal beam 42 is positioned at the junction of the auxiliary initial section D and the rear excavation chamber B, the two ends of the conversion longitudinal beam 42 are provided with vertical pillar beams 43, and the lower ends of the pillar beams 43 are positioned on the ground of the auxiliary initial section D.
As shown in fig. 1, the contours of the arches of the first excavation chamber a and the second excavation chamber B are identical to the contour of the arch of the main tunnel, the ground of the first excavation chamber a is slightly lower than the arch foot of the main tunnel, and the ground of the second excavation chamber B is at substantially the same height as the auxiliary initial section D, so as to ensure that the second excavation chamber B has enough space after excavation is completed to excavate the auxiliary initial section D from the side wall of the second excavation chamber B. The middle partition wall 12 is located in the middle of the main tunnel and separates the first excavation chamber A from the second excavation chamber B, so that the influence on the first excavation chamber A during excavation of the second excavation chamber B is reduced, and meanwhile, the middle partition wall 12 plays a role in supporting a supporting structure and improves the safety and stability of supporting.
As shown in fig. 2, after the excavation of the first excavation chamber a, the second excavation chamber B and the auxiliary initial section D is completed, a cast-in-place beam system is arranged for supporting before the formal auxiliary excavation is performed. The lower end face of an arch foot longitudinal beam 44 in a cast-in-place beam system is supported by a rock stratum, and a conversion ring beam 46 and a conversion longitudinal beam 42 are supported by a pillar beam 43, so that the strength of the support system can be greatly improved, and the stress conversion of the junction of the auxiliary initial section D and the rear excavation chamber B can be stably and safely completed.
The first, second and fourth supporting structures may be conventional supporting structures, in particular: first support structure the first support structure comprises an arched first primary support steel frame 11, the first primary support steel frame 11 is coated by first concrete 13; the second supporting structure comprises an arched second primary support steel frame 21, one end, close to the auxiliary initial section D, of the second primary support steel frame 21 is connected with a lock pin shell-expanding type anchor rod 22, the lock pin shell-expanding type anchor rod 22 is anchored in a rock stratum, and the second primary support steel frame 21 is coated by second concrete 23; the fourth supporting structure comprises a third primary support steel frame 41, the third primary support steel frame 41 is connected with the first primary support steel frame 11 and the second primary support steel frame 21 through connecting ribs 24, and the third primary support steel frame 41 is coated by third concrete 45. Each layer of supporting structure is connected into a whole, so that the strength and the stability are improved.
The top surface of the auxiliary initial section D is a horizontal plane, the third supporting structure is a door-shaped bracket consisting of a top cross beam 31 and a stand column 32, and the length direction of the top cross beam 31 is consistent with the width direction of the auxiliary initial section D. The portal type support is convenient and fast to erect, strong in supporting capacity and free of influence on auxiliary formal construction.
The auxiliary construction method for the arch cover method station from the main body comprises
S1, excavating a first excavation chamber A on the upper step C of the main tunnel, wherein the first excavation chamber A is positioned on one side far away from the attachment, and a first supporting structure and a vertical middle partition wall 12 are erected in the first excavation chamber A.
S2, excavating a back-excavation chamber B on the upper step C of the main tunnel, and erecting a second supporting structure in the back-excavation chamber B, wherein the second supporting structure is connected with the middle partition wall 12.
The excavation of the first excavation chamber A and the second excavation chamber B aims to provide an excavation space of the auxiliary initial section D, and a vault of the main tunnel is formed along with the excavation of the first excavation chamber A and the second excavation chamber B. The upper chamber of the main tunnel is excavated twice, so that the cross-sectional area of the chamber excavated every time can be reduced, the construction difficulty is reduced, and the construction safety is improved. And the rear excavation chamber B is supported after excavation is finished, so that the stability and the safety of the rear excavation chamber B can be ensured.
As shown in fig. 1, the first support structure includes an arched first primary support steel frame 11, one end of the first primary support steel frame 11 is supported by a rock stratum, the other end is connected to the middle partition wall 12, and after the first primary support steel frame 11 is erected, the first primary support steel frame 11 is sprayed with first concrete 13. The second supporting structure comprises an arched second primary support steel frame 21, one end, close to the auxiliary initial section D, of the second primary support steel frame 21 is connected with a lock pin shell-expanding type anchor rod 22, the lock pin shell-expanding type anchor rod 22 is anchored in a rock stratum, the other end of the second primary support steel frame 21 is connected with the middle partition wall 12, and after the second primary support steel frame 21 is erected, second concrete 23 is sprayed to the second primary support steel frame 21. And connecting ribs 24 are reserved on the first primary support steel frame 11 and the second primary support steel frame 21.
The support mode that adopts the steelframe and spray concrete combination has higher support intensity, and first primary support steelframe 11 and second primary support steelframe 21 are connected into an organic whole by intermediate wall 12, can improve the stability of strutting, and connect lock foot shell type stock 22 that rises on second primary support steelframe 21, further improve support intensity.
And S3, excavating the auxiliary initial section D to a proper length one by one, and erecting a third supporting structure in the auxiliary initial section D.
The auxiliary initial section D is used as an auxiliary tunnel entering channel, in order to reduce the construction difficulty, the section of the auxiliary initial section D is rectangular, and the excavation depth of the auxiliary initial section D is 1 m. The section of the auxiliary initial section D is rectangular, namely the top surface of the auxiliary initial section D is a horizontal plane, so that the auxiliary initial section D can be supported by a plurality of door-shaped supports which are convenient to erect and strong in supporting capacity and are erected along with excavation. The door type support adopts the shaped steel steelframe, every shaped steel steelframe includes horizontally top beam 31 and is located the stand 32 at top beam 31 both ends, when strutting, top beam 31 closely laminates with the roof of affiliated initial section D, top beam 31's length direction arranges along the width direction of affiliated initial section D, stand 32 is supported by ground, can bear great load, consequently, need not spray concrete and just can satisfy the requirement of strutting, it is convenient fast to erect, and sufficient space has between the coexistence post 32 of door type support, do not influence equipment and personnel etc. and come in and go out affiliated initial section D.
S4, erecting a fourth supporting structure on the lower surfaces of the first supporting structure and the second supporting structure, wherein one end, far away from the auxiliary initial section D, of the fourth supporting structure extends to an arch foot and is connected with arch foot longitudinal beam steel bars, the other end of the fourth supporting structure has an interval to the auxiliary initial section D, conversion ring beam steel bars are arranged in the interval, the lower ends of the conversion ring beam steel bars are connected with the conversion longitudinal beam steel bars, and the two ends of the conversion longitudinal beam steel bars are provided with vertical pillar beam steel bars.
The fourth supporting structure comprises a third primary support steel frame 41, the third primary support steel frame 41 is connected with the first primary support steel frame 11 and the second primary support steel frame 21 through connecting ribs 24, so that the first supporting structure, the second supporting structure, the fourth supporting structure, conversion ring beam steel bars, conversion longitudinal beam steel bars, pillar beam steel bars and arch foot longitudinal beam steel bars are connected into a whole, the common stress is exerted, after a cast-in-place beam system is poured, the load can be transmitted to the conversion ring beam 46, the arch foot longitudinal beam 44 and the like, and the safety of the first supporting structure, the second supporting structure and the fourth supporting structure is guaranteed.
The first supporting structure and the second supporting structure form a first layer of supporting structure, the fourth supporting structure is a second layer of supporting structure, and the double-layer supporting structure is combined with a cast-in-place beam system, so that the supporting stability can be greatly improved, and the stability and the safety of the transition position of the auxiliary tunnel are ensured.
S5, cast arch stringer 44, transition ring beam 46, transition stringer 42, and pillar beam 43.
The shape of the shift ring beam 46 is adapted to the shape of the dome to ensure good support. The lower end face of the arch stringer 44 is supported by the rock strata, the conversion stringer 42 is supported by the pillar stringer 43, and the pillar stringer 43 is supported by the ground of the sub-initial section D. In the cast-in-place beam system consisting of the arch foot longitudinal beams 44, the conversion ring beams 46, the conversion longitudinal beams 42 and the support column beams 43, the stratum load can be transmitted to the arch foot longitudinal beams 44 and the conversion ring beams 46 through the first supporting structures, the second supporting structures, the fourth supporting structures and the like, the arch foot longitudinal beams 44 transmit the load to the stratum, the conversion ring beams 46 transmit the load to the conversion longitudinal beams 42, the conversion longitudinal beams 42 transmit the load to the support column beams 43, the support column beams 43 are supported by the ground of the auxiliary initial section D, the support column beams 43 transmit the load to the ground, the ground can bear larger load than the arch foot stratum of the tunnel, the support column beams 43 can be stably supported, the support column beams 43 can stably support the conversion longitudinal beams 42 and the conversion ring beams 46, the stability of the junction of the auxiliary initial section D and the rear excavation chamber B is ensured, and the strength of the whole stress system is ensured, the stable stress conversion is realized, and the safety of construction conversion is improved. In addition, the supporting structure does not affect the continuous construction of the main tunnel, which is beneficial to ensuring the construction efficiency of the main tunnel, as shown in fig. 3, the pillar beams 43 and the conversion longitudinal beams 42 are distributed in a door shape, and the entering and exiting of personnel and equipment into and out of the auxiliary initial section D are not affected.
And S6, after the strength of the arch foot longitudinal beam 44, the conversion ring beam 46, the conversion longitudinal beam 42 and the support beam 43 meets the design requirements, spraying third concrete 45 to the third primary support steel frame 41, wherein the third concrete 45 can improve the connection strength of the third primary support steel frame 41 with the first primary support steel frame 11 and the second primary support steel frame 21, so that the first primary support steel frame 11, the second primary support steel frame 21 and the third primary support steel frame 41 form a firm whole. After the strength of the third concrete 45 reaches the design requirement, the support system is in a stable state, the middle partition wall 12 can be disassembled, the construction of the main body is continued, and meanwhile, the auxiliary body can be constructed.
In conclusion, the main tunnel of the station is excavated by the double-layer primary support arch cover method, and the locking anchor rods, the profile steel frame, the cast-in-place conversion ring beams and the column systems are arranged at the auxiliary interface positions when the expansion shell is arranged, so that the stress conversion of the auxiliary interface positions is completed, the stability of the arch feet of the main tunnel is ensured, the safety of the main tunnel at the auxiliary interface positions in the opening process can be effectively ensured, the continuous construction of the main tunnel is not influenced, and the construction efficiency is effectively improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for constructing the station by the arch cover method from the main body is characterized by comprising the following steps
S1, excavating a first excavation chamber A on the upper step C of the main tunnel, wherein the first excavation chamber A is positioned at one side far away from the attachment, and a first supporting structure and a vertical middle partition wall (12) are erected in the first excavation chamber A;
s2, excavating a back-excavation chamber B on the upper step C of the main tunnel, and erecting a second supporting structure in the back-excavation chamber B, wherein the second supporting structure is connected with a middle partition wall (12);
s3, excavating the auxiliary initial section D to a proper length one by one, and erecting a third supporting structure in the auxiliary initial section D;
s4, erecting a fourth supporting structure on the lower surfaces of the first supporting structure and the second supporting structure, wherein one end, far away from the auxiliary initial section D, of the fourth supporting structure extends to the arch foot and is connected with arch foot longitudinal beam steel bars, the other end of the fourth supporting structure has a distance to the auxiliary initial section D, conversion ring beam steel bars are arranged in the distance, the lower ends of the conversion ring beam steel bars are connected with the conversion longitudinal beam steel bars, and vertical pillar beam steel bars are arranged at two ends of the conversion longitudinal beam steel bars;
s5, casting arch springing longitudinal beams (44), conversion ring beams (46), conversion longitudinal beams (42) and pillar beams (43);
and S6, after the strength of the arch springing longitudinal beam (44), the conversion ring beam (46), the conversion longitudinal beam (42) and the pillar beam (43) reaches the design requirement, removing the middle partition wall (12).
2. The method for constructing an affiliated building from a main body at an arched cover subway station as set forth in claim 1, wherein in step S3, the cross-section of the affiliated initial section D is rectangular.
3. The arch cover method station as claimed in claim 1, wherein the excavation depth of the subsidiary initial section D is 1m at step S3.
4. The arched cover method station according to claim 2, wherein in step S3, the third supporting structure comprises a plurality of steel section frames, each steel section frame comprises a horizontal top beam (31) and upright posts (32) at both ends of the top beam (31), and the length direction of the top beam (31) is arranged along the width direction of the auxiliary initial section D.
5. The arch cover method station as claimed in claim 1, wherein the auxiliary construction method from the main body is performed in step S1, wherein the first supporting structure comprises an arch-shaped first primary support steel frame (11), and after the first primary support steel frame (11) is erected, the first concrete (13) is sprayed to the first primary support steel frame (11);
in the step S2, the second support structure includes an arched second primary support steel frame (21), one end of the second primary support steel frame (21) near the auxiliary initial section D is connected with a lock leg expanding-type anchor rod (22), the lock leg expanding-type anchor rod (22) is anchored in a rock stratum, and after the second primary support steel frame (21) is erected, second concrete (23) is sprayed to the second primary support steel frame (21).
6. The arch cover law station main body auxiliary construction method according to claim 5,
in the steps S1 and S2, connecting ribs (24) are reserved on the first primary support steel frame (11) and the second primary support steel frame (21);
in step S4, the fourth supporting structure includes a third primary support steel frame (41), and the third primary support steel frame (41) is connected to the first primary support steel frame (11) and the second primary support steel frame (21) by the connecting rib (24).
7. The method for constructing the subordination from the main body at the arch cover station according to claim 6, wherein in step S6, after the strength of the arch foot longitudinal beam (44), the conversion ring beam (46), the conversion longitudinal beam (42) and the pillar beam (43) reaches the design requirement, the third concrete (45) is sprayed to the third primary support steel frame (41), and after the strength of the third concrete (45) reaches the design requirement, the middle partition wall (12) is removed.
8. The arch cover method station auxiliary construction structure from the main body is characterized by comprising a main body tunnel upper step C, a first excavation chamber A, a second excavation chamber B and an auxiliary initial section D, wherein the first excavation chamber A and the second excavation chamber B are positioned above the main body tunnel upper step C and are separated by a middle partition wall (12), the auxiliary initial section D is communicated with the second excavation chamber B, a first supporting structure is arranged at the vault of the first excavation chamber A, a second supporting structure is arranged at the vault of the second excavation chamber B, a third supporting structure is arranged at the top of the auxiliary initial section D, fourth supporting structures are arranged on the lower surfaces of the first supporting structure and the second supporting structure, one end of the fourth supporting structure, far away from the auxiliary initial section D, extends to an arch foot and is connected with an arch foot longitudinal beam (44), one end of the fourth supporting structure, close to the auxiliary initial section D, is connected with a conversion ring beam (46), and the lower end of the conversion ring longitudinal beam (46) is connected with a conversion ring beam (42), the conversion longitudinal beam (42) is positioned at the junction of the auxiliary initial section D and the rear excavation chamber B, the two ends of the conversion longitudinal beam (42) are provided with vertical pillar beams (43), and the lower ends of the pillar beams (43) are positioned on the ground of the auxiliary initial section D.
9. The arched cover normal station from the main body to the auxiliary construction structure according to claim 8, characterized in that the first supporting structure comprises an arched first primary steel frame (11), the first primary steel frame (11) being coated with a first concrete (13); the second supporting structure comprises an arched second primary support steel frame (21), one end, close to the auxiliary initial section D, of the second primary support steel frame (21) is connected with a lock pin shell-expanding type anchor rod (22), the lock pin shell-expanding type anchor rod (22) is anchored in a rock stratum, and the second primary support steel frame (21) is coated by second concrete (23); the fourth supporting structure comprises a third primary support steel frame (41), the third primary support steel frame (41) is connected with the first primary support steel frame (11) and the second primary support steel frame (21) through connecting ribs (24), and the third primary support steel frame (41) is coated by third concrete (45).
10. The arched cover law station main body entering auxiliary construction structure according to claim 8, wherein the top surface of the auxiliary initial section D is a horizontal plane, the third supporting structure is a portal frame consisting of a top cross beam (31) and a vertical column (32), and the length direction of the top cross beam (31) is consistent with the width direction of the auxiliary initial section D.
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