CN112682048B - Replacement reinforcement construction method for small clear distance up-span existing tunnel of newly-built tunnel - Google Patents
Replacement reinforcement construction method for small clear distance up-span existing tunnel of newly-built tunnel Download PDFInfo
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- CN112682048B CN112682048B CN202011626231.5A CN202011626231A CN112682048B CN 112682048 B CN112682048 B CN 112682048B CN 202011626231 A CN202011626231 A CN 202011626231A CN 112682048 B CN112682048 B CN 112682048B
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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 discloses a replacement reinforcement construction method for a newly-built tunnel to span an existing tunnel with a small clear distance, which comprises the following steps: 1, performing temporary steel frame installation on lining structures at two ends of an existing tunnel in an intersection influence section; 2, removing the existing tunnel secondary lining and the existing tunnel primary support in the cross influence section; 3, enlarging and excavating surrounding rock to the designed depth; 4, constructing an advanced greenhouse; 5, performing reinforced primary support; removing the existing tunnel inverted arch and constructing the reinforced inverted arch; 7, constructing a reinforced secondary lining; 8, excavating a newly-built tunnel at the upper part when the reinforced lining structure reaches the design strength; and 9, dismantling the temporary steel frame. The invention can furthest reduce the influence on the adjacent lining sections of the existing tunnel, is beneficial to surrounding rock stabilization by removing and enlarging and digging and has good replacement and reinforcement effects, the newly-built tunnel is combined by adopting a controlled blasting and mechanical excavation mode, the construction efficiency is improved, the construction period is saved, and the structural safety of the existing tunnel and the construction safety of the newly-built tunnel are ensured.
Description
Technical Field
The invention relates to the field of tunnel construction, in particular to a replacement reinforcement construction method for a newly-built tunnel to span an existing tunnel with a small clear distance.
Background
Along with the development of tunnel construction, in the railway tunnel construction process, due to the requirement of traffic planning, the condition that a newly-built tunnel is intersected with an existing tunnel with a small clear distance often appears, and the construction of the newly-built tunnel with the small clear distance crossing the existing tunnel can bring risks to the stable structure and normal operation of the existing tunnel, and meanwhile, the safety construction and the later operation of the newly-built tunnel can be influenced. Because the design planning of the newly built tunnel cannot be considered in the construction process of the existing tunnel, the reinforced support is not adopted at the close distance of the two tunnels. The improper replacement and reinforcement method of the existing tunnel can cause construction safety problems, prolonged construction period and increased project cost. Aiming at the problems, an effective reinforcement scheme is adopted to improve the construction efficiency of a newly built tunnel and ensure the safety during the construction period and the operation period of two tunnels, which is a technical problem to be solved urgently in front of the project.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a displacement reinforcement construction method for a small clear distance up-span existing tunnel of a newly-built tunnel, so as to solve the problems of construction efficiency and construction safety of the up-span existing tunnel in the construction of the newly-built tunnel.
The purpose of the invention is realized in the following way:
a displacement reinforcement construction method for a newly-built tunnel to span an existing tunnel with a small clear distance is characterized by comprising the following steps: the method comprises the following specific steps:
step 1, in order to avoid the influence of a new tunnel and an existing tunnel from a cross influence section dismantling process on a lining structure of an existing tunnel adjacent to the cross influence section, wherein the cross influence section is an influence section of the new tunnel construction on the existing tunnel, a temporary steel frame is installed to conduct lining reinforcement on the lining structure of the existing tunnel adjacent to the cross influence section, and the lining structure of the existing tunnel comprises an existing tunnel secondary lining, an existing tunnel primary support and an existing tunnel inverted arch;
step 2, removing the second lining of the existing tunnel from top to bottom according to the whole plate for the cross influence section, and removing the primary support of the existing tunnel after the whole tunnel;
step 3: taking the detached space of the primary support of the existing tunnel as a working surface, and timely expanding and excavating surrounding rock of the existing tunnel, wherein the expanding and excavating depth meets the design thickness of a construction reinforced lining structure, and the reinforced lining structure comprises a reinforced secondary lining, a reinforced primary support and a reinforced inverted arch;
step 4: the expanded excavation section of the surrounding rock is used as a working surface, and the advanced long pipe shed is constructed: 1) Installing a guide frame and a guide pipe; 2) Drilling holes from the guide pipe by using a horizontal drilling machine; 3) Jacking construction of an advanced long pipe shed; 4) Grouting;
step 5: the expanded excavation section of the surrounding rock is used as a working face, and reinforced primary support is constructed: 1) Spraying a layer of concrete to seal surrounding rock of the expansion digging section; 2) Constructing a hollow grouting anchor rod according to the design; 3) Installing a reinforced lining steel frame and a reinforcing steel bar net, and spraying concrete; 4) Inserting lock foot steel pipes at the arch wall and corner positions of each reinforced lining steel frame;
step 6: removing the existing tunnel inverted arch and the existing tunnel inverted arch filling, firstly constructing a reinforced primary support of an inverted arch part, and then constructing a reinforced inverted arch and a reinforced inverted arch filling;
step 7: the existing tunnel secondary lining, the existing tunnel primary support and the existing tunnel inverted arch are replaced in sequence according to the steps 2-6, when the length of the reinforced primary support reaches the length of two secondary lining trolleys, the reinforced secondary lining construction is carried out by adopting the full-section steel die integral type hydraulic lining trolley, and the reinforced secondary lining construction comprises waterproof board laying, steel bar binding, concrete pouring and wall-first and arch-second pouring during concrete pouring;
step 8: after the reinforced lining structure reaches the design strength, a three-step (upper step/middle step/lower step) temporary inverted arch method is adopted to excavate the newly built tunnel at the upper part;
and 9, monitoring deformation and stress of the reinforced lining structure replaced by the existing tunnel in the construction process of the upper newly-built tunnel, and removing the temporary steel frame adjacent to the cross-affected section after the construction of the cross-affected section of the upper newly-built tunnel is finished, wherein the monitoring result of the reinforced lining structure of the existing tunnel is free from abnormal direction.
In the step 1, the temporary steel frame consists of a circumferential steel frame and a transverse strut, the distance between two adjacent temporary steel frames is 1m, the longitudinal direction of the temporary steel frames is connected by adopting steel bars, and the surfaces of the temporary steel frames and the two liners of the existing tunnel are tightly stuffed by adopting concrete wedges or wooden wedges.
In step 1, the reinforcement length of the liner adjacent to the cross-affected zone is 30m.
In step 2, the demolition construction is as follows: and removing the existing tunnel secondary lining according to the length of each plate of the existing tunnel secondary lining as a step length, and removing the existing tunnel primary support by taking the length of each 0.8m as a step length, wherein a breaking hammer is selected for mechanical removal.
In the step 3, the surrounding rock is excavated in a mechanical or weak blasting mode, and the depth of the expanded excavation is required to meet the design requirement of the thickness of the reinforced lining structure.
In step 4, the construction of the advanced long pipe shed is as follows: the circumferential spacing of the advanced long pipe shed is 40cm, the length of the advanced long pipe shed is 10m to one ring, the lap joint length is not less than 3m, the external insertion angle is not more than 12 degrees, and the grouting pressure is 0.5-1.0 Mpa.
In step 5, the reinforced primary support construction is as follows: spraying a layer of concrete with the thickness of 4cm, spraying concrete of the same level on the back of the reinforced lining steel frame when the length of the foot locking steel pipe is 5m, the diameter of the foot locking steel pipe is 50mm and the super-excavation is large, so that the reinforced primary support is closely attached to surrounding rocks of the expanded excavation section, and further development of deformation of the surrounding rocks of the expanded excavation section is controlled; the two rows of reinforced lining steel frames are longitudinally connected firmly by connecting steel bars so as to form an integral stress structure.
In step 6, the existing tunnel inverted arch is dismantled according to the distance of 1 steel frame, and a temporary inverted arch trestle is erected in the dismantling section to serve as a construction channel before the reinforced inverted arch concrete does not reach the design strength.
In step 7, the reinforced secondary lining construction is as follows: and (3) symmetrically layering from bottom to top, pouring from the wall to the arch, and pouring the mould into the mould with the free height not exceeding 2.0m.
In the step 8, mechanical excavation and controlled blasting are combined for newly-built tunnel excavation, a controlled blasting mode is adopted for an upper step, and a mechanical excavation mode is adopted for a middle step and a lower step.
The construction method of the invention is to continuously monitor and measure the deformation and stress of the reinforced lining structure of the cross influence section of the existing tunnel at the lower part in the construction process of the newly-built tunnel at the upper part, and adjust the construction process of the newly-built tunnel at the upper part according to the monitoring result if necessary.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
1. the invention is suitable for the replacement reinforcement of the lining of the large-span existing tunnel, fully utilizes each working face to dismantle the original lining, timely applies the reinforced lining, and dismantles the lining in a short step length, thereby reducing the influence on surrounding rocks of adjacent lining sections of the intersection influence section of the existing tunnel and the newly-built tunnel and the lining structure of the adjacent existing tunnel to the maximum extent, and the adoption of dismantlement, expansion and support while implementation is beneficial to the stabilization of the surrounding rocks, has good replacement reinforcement effect, adopts mechanical or weak blasting in the dismantlement mode, improves the construction efficiency and accelerates the construction progress;
2. the lengths of adjacent lining sections of the existing tunnel of the cross influence section are reasonably set, and the influence of demolishing construction and newly-built tunnel construction on the lining structure of the existing tunnel is reduced to the greatest extent;
3. the replaced reinforced lining is closely attached to the surrounding rock to form an integral stress structure, so that the further development of the deformation of the surrounding rock is controlled;
4. through the reasonable replacement reinforcement to the cross influence section, the structural bearing capacity is improved, the excavation mode of the newly-built tunnel adopts the combination of control blasting and mechanical excavation mode, the construction efficiency is improved, the construction progress is accelerated, the reinforced lining structure of the existing tunnel replacement at the lower part of the newly-built tunnel is kept stable, and meanwhile, the construction safety of the newly-built tunnel is ensured.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a flow chart of the replacement construction of the present invention;
FIG. 3 is a schematic diagram of a replacement section, adjacent section structure and upper newly constructed tunnel of the present invention;
FIG. 4 is a schematic illustration of a reinforced liner section of the present invention;
in the figure: 1-newly built tunnel, 2-existing tunnel, 3-cross influence section, 4-reinforced primary support, 5-reinforced inverted arch, 6-reinforced inverted arch filling, 7-reinforced secondary lining, 8-temporary steel frame, 9-advanced long pipe shed, 10-hollow grouting anchor rod, 11-existing tunnel inverted arch, 12-existing tunnel inverted arch filling, 13-existing tunnel primary support, 14-existing tunnel secondary lining, 15-reinforced lining steel frame and 16-surrounding rock.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-4, the embodiment of the invention provides a method for replacing and reinforcing a newly-built tunnel with a small clear distance and crossing an existing tunnel, which comprises the following steps:
step 1, in order to avoid the influence of the dismantling process of an intersection influence section 3 of a newly-built tunnel 1 and an existing tunnel 2 on the lining structure of the existing tunnel adjacent to the intersection influence section 3, the intersection influence section 3 is an influence section of the newly-built tunnel 1 construction on the existing tunnel 2, a temporary steel frame 8 is installed to carry out lining reinforcement on the lining structure of the existing tunnel adjacent to the intersection influence section 3, and the lining structure of the existing tunnel 2 comprises an existing tunnel secondary lining 14, an existing tunnel primary support 13 and an existing tunnel inverted arch 11;
step 2, dismantling the existing tunnel secondary lining 14 of the cross influence section 3 according to the whole plate from top to bottom, and dismantling the existing tunnel primary support 13 of the whole truss;
step 3: taking the detached space of the primary support 13 of the existing tunnel as a working surface, timely expanding and excavating surrounding rock 16 of the existing tunnel 2, wherein the expanding and excavating depth meets the design thickness of a supporting reinforced lining structure, and the reinforced lining structure comprises a reinforced secondary lining 7, a reinforced primary support 4 and a reinforced inverted arch 5;
step 4: the expanded excavation section of the surrounding rock 16 is used as a working surface, and the construction of the advanced long pipe shed 9 is carried out: 1) Installing a guide frame and a guide pipe; 2) Drilling holes from the guide pipe by using a horizontal drilling machine; 3) Jacking construction of the advanced long pipe shed 9; 4) Grouting;
step 5: the expanded excavation section of the surrounding rock 16 is used as a working surface, and the reinforced primary support 4 is constructed: 1) Spraying a layer of concrete to seal surrounding rock 16 of the expanding excavation section; 2) Constructing a hollow grouting anchor rod 10 according to the design; 3) Installing a reinforced lining steel frame 15 and a reinforcing mesh and spraying concrete; 4) Inserting lock foot steel pipes at the arch wall and corner positions of each reinforced lining steel frame 15;
step 6: removing the existing tunnel inverted arch 11 and the existing tunnel inverted arch filling 12, constructing a reinforced primary support 4 of the inverted arch part, and then constructing a reinforced inverted arch 5 and a reinforced inverted arch filling 6;
step 7: the existing tunnel secondary lining 14, the existing tunnel primary support 13 and the existing tunnel inverted arch 11 are replaced in sequence according to the steps 2-6, when the length of the reinforced primary support 4 reaches the length of two secondary lining trolleys, the reinforced secondary lining 7 is constructed by adopting a full-section steel die integral type hydraulic lining trolley, and the construction comprises waterproof board laying, steel bar binding and concrete pouring, wherein the wall is firstly built and then the arch is built when concrete is poured;
step 8: after the reinforced lining structure reaches the design strength, a three-step (upper step/middle step/lower step) temporary inverted arch method is adopted to excavate the newly built tunnel 1 at the upper part;
and 9, monitoring deformation and stress of the reinforced lining structure replaced by the existing tunnel 2 in the construction process of the upper newly-built tunnel 1, and removing the temporary steel frame 8 adjacent to the cross-affected section 3 from the monitoring result of the reinforced lining structure of the existing tunnel 2 after the construction of the cross-affected section 3 of the upper newly-built tunnel 1 is finished.
In step 1, the reinforcement length of the liner adjacent to the cross-affected zone is selected to be 30m.
In step 1, the temporary steel frames 8 are composed of annular steel frames and cross braces, the distance between two adjacent temporary steel frames 8 is 1m, steel bars are connected in the longitudinal direction of the temporary steel frames 8, and the surfaces of the temporary steel frames 8 and the existing tunnel secondary lining 14 are tightly packed by concrete wedges or wooden wedges.
In step 2, the demolition construction is as follows: and dismantling the existing tunnel secondary lining 14 according to the length of each plate of the existing tunnel secondary lining 14 as a step length, dismantling the existing tunnel primary support 13 as a step length of each 0.8m length, and mechanically dismantling by using a breaking hammer.
In step 3, the surrounding rock 16 is excavated by a mechanical or weak blasting manner, and the depth of the expanded excavation is required to meet the design requirement of the thickness of the reinforced lining structure.
In step 4, the construction of the advanced long pipe canopy 9 is as follows: the circumferential spacing of the leading long pipe shed 9 is 40cm, the length of the leading long pipe shed 9 is 10 m-ring, the lap joint length is not less than 3m, the external insertion angle is not more than 12 degrees, and the grouting pressure is 0.5-1.0 Mpa.
In step 5, the reinforced primary support 4 is constructed by: spraying a layer of concrete with the thickness of 4cm, spraying concrete of the same level on the back of the reinforced lining steel frame 15 when the length of the foot locking steel pipe is 5m, the diameter of the foot locking steel pipe is 50mm and the super-excavation is large, so that the reinforced primary support 4 is closely attached to the surrounding rock 16 of the expanded excavation section, and further development of deformation of the surrounding rock 16 of the expanded excavation section is controlled; the two rows of reinforced lining steel frames 15 are longitudinally connected firmly by connecting steel bars so as to form an integral stress structure.
In step 6, the existing tunnel inverted arch 11 is dismantled according to the distance of 1 steel frame, and a temporary inverted arch trestle is erected in the dismantling section as a construction channel before the reinforced inverted arch 5 concrete does not reach the design strength.
In step 7, the reinforced lining secondary lining 7 is constructed as follows: and (3) symmetrically layering from bottom to top, pouring from the wall to the arch, and pouring the mould into the mould with the free height not exceeding 2.0m.
In this embodiment, in the construction process of the upper newly-built tunnel 1, deformation and stress of the reinforced lining structure of the cross-affected section 3 of the existing lower tunnel 2 are monitored and measured continuously, and if necessary, the construction process of the upper newly-built tunnel 1 is adjusted according to the monitoring result.
The parameters of the reinforced lining structure in this embodiment are: the steel arch frame adopts HW175 section steel with the interval of 0.6m, phi 6 reinforcing steel meshes are arranged at the back, and the grid interval is 20 x 20; the sprayed concrete is marked as C25 and has the thickness of 28cm; the advanced support adopts a phi 89 pipe shed, the circumferential spacing is 40cm, and the length of each section is 10m; the secondary lining is made of C30 reinforced concrete, and the thickness is 70cm; the inverted arch is filled with C20 plain concrete.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. A displacement reinforcement construction method for a newly-built tunnel to span an existing tunnel with a small clear distance is characterized by comprising the following steps of: the method comprises the following specific steps:
step 1, in order to avoid the influence of a new tunnel and an existing tunnel from a cross influence section dismantling process on a lining structure of an existing tunnel adjacent to the cross influence section, wherein the cross influence section is an influence section of the new tunnel construction on the existing tunnel, a temporary steel frame is installed to conduct lining reinforcement on the lining structure of the existing tunnel adjacent to the cross influence section, and the lining structure of the existing tunnel comprises an existing tunnel secondary lining, an existing tunnel primary support and an existing tunnel inverted arch;
step 2, removing the second lining of the existing tunnel from top to bottom according to the whole plate for the cross influence section, and removing the primary support of the existing tunnel after the whole tunnel;
step 3: taking the detached space of the primary support of the existing tunnel as a working surface, and timely expanding and excavating surrounding rock of the existing tunnel, wherein the expanding and excavating depth meets the design thickness of a construction reinforced lining structure, and the reinforced lining structure comprises a reinforced secondary lining, a reinforced primary support and a reinforced inverted arch;
step 4: the expanded excavation section of the surrounding rock is used as a working surface, and the advanced long pipe shed is constructed: 1) Installing a guide frame and a guide pipe; 2) Drilling holes from the guide pipe by using a horizontal drilling machine; 3) Jacking construction of an advanced long pipe shed; 4) Grouting;
step 5: the expanded excavation section of the surrounding rock is used as a working face, and reinforced primary support is constructed: 1) Spraying a layer of concrete to seal surrounding rock of the expansion digging section; 2) Constructing a hollow grouting anchor rod according to the design; 3) Installing a reinforced lining steel frame and a reinforcing steel bar net, and spraying concrete; 4) Inserting lock foot steel pipes at the arch wall and corner positions of each reinforced lining steel frame;
step 6: removing the existing tunnel inverted arch and the existing tunnel inverted arch filling, firstly constructing a reinforced primary support of an inverted arch part, and then constructing a reinforced inverted arch and a reinforced inverted arch filling;
step 7: the existing tunnel secondary lining, the existing tunnel primary support and the existing tunnel inverted arch are replaced in sequence according to the steps 2-6, when the length of the reinforced primary support reaches the length of two secondary lining trolleys, the reinforced secondary lining construction is carried out by adopting the full-section steel die integral type hydraulic lining trolley, and the reinforced secondary lining construction comprises waterproof board laying, steel bar binding, concrete pouring and wall-first and arch-second pouring during concrete pouring;
step 8: after the reinforced lining structure reaches the design strength, a three-step temporary inverted arch method is adopted to excavate the newly-built tunnel on the upper part, wherein: the three steps are an upper step, a middle step and a lower step;
and 9, monitoring deformation and stress of the reinforced lining structure replaced by the existing tunnel in the construction process of the upper newly-built tunnel, and removing the temporary steel frame adjacent to the cross-affected section after the construction of the cross-affected section of the upper newly-built tunnel is finished, wherein the monitoring result of the reinforced lining structure of the existing tunnel is free from abnormal direction.
2. The method for replacing and reinforcing the existing tunnel with the small clear distance up-span newly-built tunnel according to claim 1, which is characterized in that: in the step 1, the temporary steel frames consist of annular steel frames and transverse struts, the distance between two adjacent temporary steel frames is 1m, the longitudinal directions of the temporary steel frames are connected by adopting steel bars, and the surfaces of the temporary steel frames and the existing tunnel secondary lining are tightly stuffed by adopting concrete wedges or wooden wedges; the reinforcement length of the liner adjacent to the crossover-affected zone is 30m.
3. The method for replacing and reinforcing the existing tunnel with the small clear distance up-span newly-built tunnel according to claim 1, which is characterized in that: in step 2, the demolition construction is as follows: and removing the existing tunnel secondary lining according to the length of each plate of the existing tunnel secondary lining as a step length, and removing the existing tunnel primary support by taking the length of each 0.8m as a step length, wherein a breaking hammer is selected for mechanical removal.
4. The method for replacing and reinforcing the existing tunnel with the small clear distance up-span newly-built tunnel according to claim 1, which is characterized in that: in the step 3, the surrounding rock is excavated in a mechanical or weak blasting mode, and the depth of the expanded excavation is required to meet the design requirement of the thickness of the reinforced lining structure.
5. The method for replacing and reinforcing the existing tunnel with the small clear distance up-span newly-built tunnel according to claim 1, which is characterized in that: in step 4, the construction of the advanced long pipe shed is as follows: the circumferential spacing of the advanced long pipe shed is 40cm, the length of the advanced long pipe shed is 10m to one ring, the lap joint length is not less than 3m, the external insertion angle is not more than 12 degrees, and the grouting pressure is 0.5-1.0 Mpa.
6. The method for replacing and reinforcing the existing tunnel with the small clear distance up-span newly-built tunnel according to claim 1, which is characterized in that: in step 5, the construction-reinforced primary support construction is as follows: spraying a layer of concrete with the thickness of 4cm, spraying concrete of the same level on the back of the reinforced lining steel frame when the length of the foot locking steel pipe is 5m, the diameter of the foot locking steel pipe is 50mm and the super-excavation is large, so that the primary support of the reinforced lining is closely attached to surrounding rocks of the expanded excavation section, and further development of deformation of the surrounding rocks of the expanded excavation section is controlled; the two rows of reinforced lining steel frames are longitudinally connected firmly by connecting steel bars so as to form an integral stress structure.
7. The method for replacing and reinforcing the existing tunnel with the small clear distance up-span newly-built tunnel according to claim 1, which is characterized in that: in step 6, the existing tunnel inverted arch is dismantled according to the distance of 1 steel frame, and a temporary inverted arch trestle is erected in the dismantling section to serve as a construction channel before the reinforced inverted arch concrete does not reach the design strength.
8. The method for replacing and reinforcing the existing tunnel with the small clear distance up-span newly-built tunnel according to claim 1, which is characterized in that: in step 7, the reinforced secondary lining construction is as follows: and (3) symmetrically layering from bottom to top, pouring from the wall to the arch, and pouring the mould into the mould with the free height not exceeding 2.0m.
9. The method for replacing and reinforcing the existing tunnel with the small clear distance up-span newly-built tunnel according to claim 1, which is characterized in that: in the step 8, mechanical excavation and controlled blasting are combined for newly-built tunnel excavation, a controlled blasting mode is adopted for an upper step, and a mechanical excavation mode is adopted for a middle step and a lower step.
10. The method for replacing and reinforcing the existing tunnel with the small clear distance up-span newly-built tunnel according to claim 1, which is characterized in that: the construction method is that deformation and stress of a reinforced lining structure of a cross influence section of an existing tunnel at the lower part are monitored and measured continuously in the construction process of a newly-built tunnel at the upper part, and if necessary, the construction process of the newly-built tunnel at the upper part is adjusted according to the monitoring result.
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