Tunnel construction method

Abstract

The invention discloses a tunnel construction method and aims to solve the technical problems that in the prior art, when a long and large tunnel is constructed by adopting a transverse shed tunnel method and a longitudinal climbing pilot tunnel method, the construction period pressure is large, the construction period is long, and meanwhile after the large mileage and the small mileage of a main tunnel fall to the bottom, the distance between the large mileage and the small mileage is short; meanwhile, connection air duct construction between a left line and a right line needs to be carried out when inverted arch construction of an intersection section is completed, construction interference is large, construction cannot be carried out at the same time, when secondary lining trolley splicing is carried out in one direction of the large mileage and the small mileage of a main tunnel, normal construction of the large mileage and the small mileage of the main tunnel is affected, and right line top lifting can be started 40 days after left line top lifting is completed; and the influence on the right line construction period is large.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and in particular to a tunnel construction method. Background Art

[0002] In the construction of extra-long tunnels, inclined shafts, cross tunnels and other methods are often used to increase the construction working surface. Domestic and foreign scholars have also conducted a lot of research on the top-lift construction of inclined shafts, cross tunnels and other methods, and there are already many engineering examples.

[0003] In the prior art, when constructing long and large tunnels, the horizontal shed tunnel method and the longitudinal climbing guide tunnel method are used for construction, which results in high pressure on the construction period and a long construction period. At the same time, after the main tunnel and the large and small mileages are both at the bottom, the distance between the large and small mileages is relatively close. At the same time, after the construction of the intersection section invert arch is completed, the construction of the connecting air duct between the left and right lines is required, which results in large construction interference and makes it impossible to carry out construction at the same time. When the second lining trolley is assembled in one direction of the main tunnel and the large and small mileages, the normal construction of the main tunnel and the large and small mileages will be affected. The right line cantilevering can only start 40 days after the left line cantilevering is completed, which has a great impact on the construction period of the right line. Summary of the invention

[0004] The main purpose of the present invention is to provide a tunnel construction method, which aims to solve the technical problems existing in the related technology that when constructing long and large tunnels, there is great pressure on the construction period and long construction period when using the horizontal shed tunnel method and the longitudinal climbing guide tunnel method.

[0005] To achieve the above object, in a first aspect, the present invention provides a tunnel construction method, wherein the tunnel comprises at least two sub-tunnels spaced apart from each other; the tunnel construction method comprises the following steps:

[0006] According to preset data, excavation is performed on the connecting air duct structure of one of the sub-tunnels to form at least two first target construction faces spaced apart in the extension direction of the corresponding sub-tunnel; wherein the connecting air duct structure includes a connecting main air duct extending along a first direction and a newly added air duct extending along at least one second direction, and the first direction intersects with each of the second directions;

[0007] Performing top-lift construction on the corresponding sub-tunnel along the extension direction of the corresponding sub-tunnel at all the first target construction faces;

[0008] Continue to construct the connecting main air duct along the first direction until it connects with another sub-tunnel to form at least one second target construction face;

[0009] At the same time, tunnel excavation operations are performed on the corresponding sub-tunnels at all the first target construction faces and all the second target construction faces to form the tunnel structure.

[0010] Optionally, the step of excavating the connecting air duct structure of one of the sub-tunnels according to preset data to form at least two first target construction faces spaced apart in the extension direction of the corresponding sub-tunnel includes:

[0011] Constructing the connecting main air duct to a first preset tunnel face along a first construction direction;

[0012] Excavating a preset length of the newly added exhaust duct along a second direction on the first preset tunnel face to form a second preset tunnel face;

[0013] At the same time, excavation and construction continue at the first preset tunnel face and the second preset tunnel face to the corresponding sub-tunnel, so as to form at least two first target construction tunnel faces spaced apart in the extension direction of the corresponding sub-tunnel.

[0014] Optionally, the step of performing top construction on the corresponding sub-tunnel along the extension direction of the corresponding sub-tunnel at all the first target construction faces includes:

[0015] At all the first target construction faces, top excavation is performed on the corresponding sub-tunnels along the small mileage extension direction of the corresponding sub-tunnels to construct a first target length, so as to form a first section to be supported;

[0016] Continue to perform top excavation construction of the corresponding sub-tunnel to a second target length along the long mileage direction of the corresponding sub-tunnel on all the first template construction faces, so as to form a second section to be supported that is interconnected with the first section to be supported;

[0017] Support and excavation construction are performed on the first section to be supported and the second section to be supported.

[0018] Optionally, the step of supporting and excavating the first section to be supported and the second section to be supported includes:

[0019] Performing support construction on the top of the first section to be supported and the top of the second section to be supported;

[0020] Continue excavation work in the area where the cantilever construction has been completed.

[0021] Optionally, the step of performing support construction on the top of the first section to be supported and the top of the second section to be supported includes:

[0022] A plurality of arc-shaped support structures are installed on the cantilever of the first section to be supported and the cantilever of the second section to be supported according to target spacings and concrete is sprayed to carry out support construction.

[0023] Optionally, after the top of the connecting air duct in the large mileage direction is completed, first construct 10m in the large mileage direction, turn around and construct the connecting air duct to the newly added air duct section, and after constructing 10m in the small mileage direction, the large and small mileages are simultaneously bottomed out to form a closed loop, with the large mileage direction being the main construction direction.

[0024] Optionally, after the construction of the connecting air duct section invert is completed, the construction of the connecting air duct between the left and right lines can be carried out.

[0025] Optionally, the top can be lifted toward the right line with large mileage through the connecting air duct between the left and right lines;

[0026] After the left line small mileage construction reaches the vehicle tunnel, the vehicle tunnel construction will be carried out after the vehicle tunnel invert arch construction is completed.

[0027] Optionally, after the top is lifted in the direction of the long mileage on the right line, first construct 10m in the direction of the long mileage, turn around and construct 10m in the direction of the short mileage, and then the large and small mileages are simultaneously bottomed out to form a closed loop, with the construction in the direction of the long mileage as the main focus.

[0028] Optionally, after the vehicle cross tunnel is penetrated, the vehicle cross tunnel is used to carry out top lifting in the direction of the short mileage of the right line, and after the top lifting is completed, construction is carried out in the direction of the short mileage.

[0029] The technical solution of the present invention is to excavate the connecting air duct structure of one of the sub-tunnels according to preset data to form at least two first target construction faces spaced apart in the extension direction of the corresponding sub-tunnel, perform top construction on the corresponding sub-tunnel along the extension direction of the corresponding sub-tunnel on all the first target construction faces, continue to construct the connecting main air duct along the first direction to another sub-tunnel to form at least one second target construction face, and at the same time perform tunnel excavation operations on the corresponding sub-tunnel on all the first target construction faces and all the second target construction faces Construction to form the tunnel structure solves the problems existing in related technologies. When constructing long and large tunnels, the horizontal shed tunnel method and the longitudinal climbing guide tunnel method are used for construction, which results in high pressure on the construction period and a long construction period. At the same time, after the main tunnel and the large and small mileages are both at the bottom, the distance between the large and small mileages is relatively close. At the same time, the construction of the intersection section arch is completed and the construction of the connecting air duct between the left and right lines is required. The construction interference is relatively large and the construction cannot be carried out at the same time. When the second lining trolley is assembled in one direction of the main tunnel and the large and small mileages, the normal construction of the main tunnel and the large and small mileages will be affected. The right line cantilevering can only start 40 days after the left line cantilevering is completed, which has a greater impact on the construction period of the right line. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 A flow chart of a tunnel construction method according to an embodiment of the present invention;

[0032] Figure 2 for Figure 1 Flow chart of step S100 in the example;

[0033] Figure 3 for Figure 1 Flow chart of step S200 in the example;

[0034] Figure 4 for Figure 3 Flowchart of step S230 illustrated in FIG.

[0035] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between various mechanisms under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] The inventive concept of the present invention is further described below in conjunction with some specific implementation methods.

[0041] The invention provides a tunnel construction method.

[0042] like Figures 1 to 4 As shown, the present invention discloses an embodiment of a tunnel construction method.

[0043] In this embodiment, please refer to Figure 1 The tunnel construction method of this type includes at least two sub-tunnels spaced apart from each other; the tunnel construction method includes the following steps:

[0044] S100, excavating the connecting air duct structure of one of the sub-tunnels according to preset data to form at least two first target construction faces spaced apart in the extension direction of the corresponding sub-tunnel; wherein the connecting air duct structure includes a connecting main air duct extending along a first direction and a newly added air duct extending along at least one second direction, and the first direction intersects with each of the second directions;

[0045] Specifically, the execution subject of this embodiment is the tunnel construction management system, which establishes data connection with geological radar scanning equipment, three-dimensional laser profiler and hydraulic rock drilling trolley group. The system first retrieves the preset geological exploration data to determine the degree of development of rock stratum fissures and the stability classification of surrounding rock. Taking a double-line tunnel project in a mountainous area as an example, the left-line sub-tunnel is selected as the priority construction line, and two connecting air duct construction nodes are planned at intervals of 120m along its axial direction.

[0046] The main air duct extends along the axis of the tunnel (the first direction), and the newly added air duct expands to the right rock mass in a direction perpendicular to the axis (the second direction). At the K12+340 mileage of the left-line sub-tunnel, the hydraulic rock drilling trolley group carried out full-section blasting according to the preset drilling parameters to form the initial support section of the main air duct with a width of 6m and a height of 8m. Immediately after the blasting, a wet spraying manipulator was used to spray 20cm thick C25 steel fiber concrete for closed support. When the main air duct was excavated to the K12+420 mileage (the first preset heading), the trolley group turned to the right rock mass and excavated in steps at an elevation of 15° along the second direction to form a newly added exhaust duct with a length of 35m (the second preset heading). At this time, the system simultaneously activated two face operation units: the K12+420 face continued to excavate forward to connect the main air duct, and at the same time, radial grouting reinforcement was implemented at the end of the newly added exhaust duct at K12+455, eventually forming the first target construction faces of K12+340 and K12+420 with a spacing of 85m.

[0047] S200, performing top construction on the corresponding sub-tunnel along the extension direction of the corresponding sub-tunnel at all the first target construction faces;

[0048] The construction management system dynamically adjusts the progress of each face through the BIM model. At the K12+340 face of the left sub-tunnel, the three-arm rock drilling trolley performs top construction in the small mileage direction (i.e., toward the tunnel entrance) at a 0.5m cycle footage. After each 3m top excavation, the HW175 steel frame is immediately erected with a spacing of 0.6m, and the Φ22 drug roll anchor rod is used for locking anchoring. When the 15m (first target length) top is completed to form the first section to be supported, the trolley group turns around to carry out construction in the large mileage direction (towards the tunnel exit). At this time, the double-layer advanced small catheter grouting process is adopted, and Φ42 steel flower pipes are arranged along the 150° range of the arch, and the grouting pressure is controlled at 1.5-2.0MPa. After completing the top of 10m (second target length), the system starts the section scanning module to confirm that the penetration error between the first section to be supported and the second section to be supported is less than 5cm before allowing joint support.

[0049] S300, continuing to construct the connecting main air duct along the first direction until it connects with another sub-tunnel to form at least one second target construction face;

[0050] When the left line main air duct was excavated to K12+680, the construction management system activated the rock penetration warning module. The position of the right line sub-tunnel was detected by transient electromagnetic method, and mechanical excavation was switched when the thickness of the remaining rock column reached 8m. The milling machine was used in conjunction with hydraulic fracturing equipment for precise penetration, forming the second target construction face at K13+120 on the right line. At this time, the system reallocated construction resources: the left line retained the two faces at K12+340 and K12+420, and the right line added the K13+120 face, and the three working faces formed a herringbone advancement pattern.

[0051] S400. Simultaneously, tunnel excavation operations are performed on the corresponding sub-tunnels at all the first target construction faces and all the second target construction faces to form the tunnel structure.

[0052] The system starts the multi-working face collaborative control protocol: the left line K12+340 face adopts the three-step seven-step excavation method, with a penetration of 1.2m per cycle; the K12+420 face implements the CD method, and a temporary invert is set every 5m on the middle partition wall; the right line K13+120 face adopts the circular excavation and core soil retention process. The blasting sequence of each working face is precisely controlled by the micro-difference detonation system, and the vibration monitoring data shows that the blasting vibration speed of each face is less than 2.5cm / s. When the thickness of the rock column between the left and right lines is reduced to 3m, the system automatically switches to static crushing agent expansion construction, and finally achieves accurate penetration of the entire section.

[0053] The technical solution of the present invention is to excavate the connecting air duct structure of one of the sub-tunnels according to preset data to form at least two first target construction faces spaced apart in the extension direction of the corresponding sub-tunnel, perform top construction on the corresponding sub-tunnel along the extension direction of the corresponding sub-tunnel on all the first target construction faces, continue to construct the connecting main air duct along the first direction to another sub-tunnel to form at least one second target construction face, and at the same time perform tunnel excavation operations on the corresponding sub-tunnel on all the first target construction faces and all the second target construction faces Construction to form the tunnel structure solves the problems existing in related technologies. When constructing long and large tunnels, the horizontal shed tunnel method and the longitudinal climbing guide tunnel method are used for construction, which results in high pressure on the construction period and a long construction period. At the same time, after the main tunnel and the large and small mileages are both at the bottom, the distance between the large and small mileages is relatively close. At the same time, the construction of the intersection section arch is completed and the construction of the connecting air duct between the left and right lines is required. The construction interference is relatively large and the construction cannot be carried out at the same time. When the second lining trolley is assembled in one direction of the main tunnel and the large and small mileages, the normal construction of the main tunnel and the large and small mileages will be affected. The right line cantilevering can only start 40 days after the left line cantilevering is completed, which has a greater impact on the construction period of the right line.

[0054] Optionally, step S100 includes:

[0055] S110, constructing the connecting main air duct along a first construction direction to a first preset tunnel face;

[0056] In this embodiment, the construction equipment starts the operation process of connecting the main air duct according to the pre-planned first construction direction. Construction personnel operate professional equipment such as shield machines, and gradually advance according to accurate measurement data and construction drawings until they reach the first preset face. In this process, the key parameters such as soil pressure and torque during the excavation process are monitored through a real-time monitoring system to ensure the stability and safety of the construction. For example, in a subway tunnel construction scenario, the first construction direction is from the starting point to the end point of the tunnel. The construction team reasonably sets the position of the first preset face based on the geological exploration report, so that it is in an area with relatively stable geological conditions, so as to facilitate the smooth implementation of subsequent construction operations.

[0057] S120, excavating a preset length of the newly added exhaust duct along a second direction on the first preset tunnel face to form a second preset tunnel face;

[0058] After arriving at the first preset face, the construction team immediately adjusted the construction direction and started the excavation of the new exhaust duct along the second direction. According to the pre-set construction length parameters, the excavation progress is accurately controlled to form the second preset face. In this link, laser guidance technology is used to ensure the accuracy of the excavation direction. At the same time, advanced geological prediction equipment is used to detect the geological conditions ahead in advance so as to adjust the construction plan in time. Taking the construction of a mountain tunnel as an example, the second direction may be perpendicular to the direction of the main air duct. The construction personnel determine the excavation length of the new exhaust duct according to the tunnel ventilation design requirements to ensure that it can meet the overall layout requirements of the tunnel ventilation system.

[0059] S130. Simultaneously, excavation and construction continue on the first preset tunnel face and the second preset tunnel face to the corresponding sub-tunnel, so as to form at least two first target construction tunnel faces spaced apart in an extension direction of the corresponding sub-tunnel.

[0060] After completing the first two steps, the construction team simultaneously carried out subsequent excavation work at the first preset face and the second preset face until they reached the corresponding sub-tunnel positions. As the excavation work continued to advance, at least two first target construction faces were formed in sequence at the predetermined intervals in the extension direction of the sub-tunnel. In this process, multiple devices worked together to reasonably arrange the construction sequence and personnel division of labor to improve construction efficiency. For example, in a certain submarine tunnel construction project, the sub-tunnel is a dedicated channel for installing a special drainage system. The construction team determined the interval distance of the first target construction face based on the submarine geological characteristics and drainage system design requirements to ensure the effective installation and operation of the drainage system.

[0061] Optionally, step S200 includes:

[0062] S210, performing top excavation construction of a first target length on the corresponding sub-tunnel along the small mileage extension direction of the corresponding sub-tunnel at all the first target construction faces to form a first section to be supported;

[0063] The construction personnel operate professional excavation equipment and start the top excavation operation at all the first target construction faces along the small mileage extension direction of the sub-tunnel. According to the pre-set first target length parameters, the excavation range is accurately controlled to form the first section to be supported. In this process, advanced measurement robots are used to monitor the accuracy of the excavation profile in real time to ensure that it meets the design requirements. At the same time, the construction team pays close attention to the stability of the surrounding rock and immediately takes corresponding reinforcement measures if there are any abnormal conditions. For example, in the construction of a certain city's underground comprehensive pipeline corridor, the small mileage extension direction of the sub-tunnel is the water inlet direction of the pipeline corridor. The construction team determines the first target length based on the structural design of the pipeline corridor and the water flow characteristics to ensure that the first section to be supported can meet the space requirements of subsequent support operations.

[0064] S220, continue to perform top excavation construction of the corresponding sub-tunnel to a second target length along the long mileage direction of the corresponding sub-tunnel on all the first template construction faces, so as to form a second section to be supported that is interconnected with the first section to be supported;

[0065] After completing the excavation of the first section to be supported, the construction team continued to carry out top excavation operations along the large mileage direction of the sub-tunnel at all the first template construction faces. According to the second target length parameter, the excavation progress is accurately controlled to form a second section to be supported that is interconnected with the first section to be supported. In this process, the excavation process is optimized to reduce disturbance to the surrounding rock, and ventilation management is strengthened to ensure the safety of the construction environment. Taking the construction of a highway tunnel as an example, the large mileage direction of the sub-tunnel is the slag discharge direction of the tunnel. The construction team determines the second target length according to the design requirements of the tunnel's transportation channel to ensure that after the second section to be supported is connected with the first section to be supported, it can meet the layout requirements of the tunnel transportation system.

[0066] S230: Support and excavate the first section to be supported and the second section to be supported.

[0067] After forming the first and second sections to be supported, the construction team immediately carried out support operations. Using support materials such as steel mesh and steel arch frame, combined with the shotcrete process, the two sections to be supported were initially supported. At the same time, the subsequent excavation construction continued to ensure the continuity of the construction progress. In this process, through a strict support quality inspection process, the key indicators such as the strength and stability of the support structure were tested to ensure that it can effectively guarantee construction safety. For example, in the construction of a railway tunnel, the construction team selected appropriate support materials and process parameters based on the load standards and safety specifications of the railway tunnel to ensure that the support quality of the first and second sections to be supported met the railway driving safety requirements.

[0068] Optionally, step S230 includes:

[0069] S231, performing support construction on the top of the first section to be supported and the top of the second section to be supported;

[0070] For the top positions of the first and second sections to be supported, the construction workers used professional support equipment and materials to carry out refined support construction. By accurately measuring the size and shape of the top position, suitable support components are customized to ensure that the support structure fits tightly with the surrounding rock. In this process, non-contact measurement technology is used to monitor the deformation of the top position in real time so that the support plan can be adjusted in time. For example, in the construction of a mine tunnel, due to the complex geological conditions of the mine, the top position is prone to collapse risks. The construction team used high-strength anchor rods and anchor cables, combined with steel arch frames, to strengthen the support of the top position, effectively improving the stability of the tunnel.

[0071] S232. Continue excavation work in the area where the cantilever construction has been completed.

[0072] After completing the support construction of the top position, the construction team continued to carry out excavation work in the area where the support has been completed. According to the pre-planned excavation route and schedule, the construction equipment and personnel are reasonably deployed to ensure the efficient progress of the excavation work. At the same time, strengthen on-site safety management, set up obvious safety warning signs, and remind construction personnel to pay attention to safety. For example, in the construction of a water conservancy tunnel, the construction team adopted a layered excavation method according to the cross-sectional shape and construction requirements of the water conservancy tunnel, and carried out subsequent excavation in the area where the top support was completed to ensure the construction quality and progress of the tunnel.

[0073] Optionally, the step of performing support construction on the top of the first section to be supported and the top of the second section to be supported includes:

[0074] A plurality of arc-shaped support structures are installed on the cantilever of the first section to be supported and the cantilever of the second section to be supported according to target spacings and concrete is sprayed to carry out support construction.

[0075] After the top of the connecting air duct in the large mileage direction is completed, first construct 10m in the large mileage direction, turn around and construct the connecting air duct to the newly added air duct section, and after constructing 10m in the small mileage direction, the large and small mileages will be simultaneously bottomed out to form a closed loop, with the large mileage direction being the main construction direction.

[0076] After the construction of the connecting air duct section is completed, the construction of the connecting air duct between the left and right lines will be carried out.

[0077] Through the connecting air duct between the left and right lines, the top is lifted in the direction of the right line with large mileage;

[0078] After the left line small mileage construction reaches the vehicle tunnel, the vehicle tunnel construction will be carried out after the vehicle tunnel invert arch construction is completed.

[0079] After the top construction of the right line with large mileage is completed, first construct 10m in the direction of the large mileage, then turn around and construct 10m in the direction of the small mileage, and then the large and small mileages will be simultaneously completed to form a closed loop, with the construction in the direction of the large mileage as the main focus.

[0080] After the vehicle cross tunnel is penetrated, the vehicle cross tunnel is used to lift the roof in the direction of the short mileage of the right line. After the lifting is completed, construction is carried out in the direction of the short mileage.

[0081] In a large mountain highway tunnel construction project, the tunnel is long and has complex geological conditions. The traditional horizontal shed tunnel method and longitudinal climbing tunnel method are used for construction, which faces the technical problems of high pressure on construction schedule and long construction period. To solve this problem, the construction method in this embodiment is applied.

[0082] During construction, the construction team first constructs the main connecting air duct along the first construction direction according to the requirements of step S100, and arrives at the first preset face. Subsequently, the newly added exhaust duct is excavated along the second direction at the first preset face to a preset length, forming a second preset face. Then, excavation construction continues to the corresponding sub-tunnel at the first preset face and the second preset face at the same time, forming at least two first target construction faces distributed at intervals. In this process, by rationally planning the construction direction and progress, the construction space is fully utilized and the construction efficiency is improved.

[0083] Then, the construction phase of step S200 is entered. The construction personnel carry out top excavation to construct the first target length in all the first target construction faces along the small mileage extension direction of the sub-tunnel to form the first section to be supported. Then, continue to carry out top excavation to construct the second target length in all the first template construction faces along the large mileage direction of the sub-tunnel to form the second section to be supported that is interconnected with the first section to be supported. After the section to be supported is formed, support and excavation construction is immediately carried out to ensure the continuity of the construction progress. In this process, the construction time and cost are reduced by optimizing the support and excavation process.

[0084] In the construction of step S230, the construction team carried out support construction on the top of the first section to be supported and the second section to be supported, using advanced support technology and materials to improve the support quality. Subsequently, excavation construction continued in the area where the top construction was completed to ensure the smooth progress of tunnel construction. Throughout the construction process, through the close connection and coordinated operation of each step, the technical problems of high pressure on the construction period and long construction period were effectively solved, and the efficiency and quality of long and large tunnel construction were improved.

[0085] To sum up, the construction method in this embodiment effectively solves the technical problems of high construction period pressure and long construction period when using the horizontal shed tunnel method and the longitudinal climbing tunnel method in the construction of long and large tunnels by rationally planning the construction steps and process flow, thereby improving the efficiency and quality of tunnel construction and having good application prospects and promotion value.

[0086] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A tunnel construction method, characterized in that: The tunnel comprises at least two sub-tunnels spaced apart from each other; and the tunnel construction method comprises the following steps: According to preset data, excavation is performed on the connecting air duct structure of one of the sub-tunnels to form at least two first target construction faces spaced apart in the extension direction of the corresponding sub-tunnel; wherein the connecting air duct structure includes a connecting main air duct extending along a first direction and a newly added air duct extending along at least one second direction, and the first direction intersects with each of the second directions; Performing top-lift construction on the corresponding sub-tunnel along the extension direction of the corresponding sub-tunnel at all the first target construction faces; Continue to construct the connecting main air duct along the first direction until it connects with another sub-tunnel to form at least one second target construction face; At the same time, tunnel excavation operations are performed on the corresponding sub-tunnels at all the first target construction faces and all the second target construction faces to form the tunnel structure.

2. The tunnel construction method according to claim 1, characterized in that: The step of excavating the connecting air duct structure of one of the sub-tunnels according to the preset data to form at least two first target construction faces spaced apart in the extension direction of the corresponding sub-tunnel comprises: Constructing the connecting main air duct to a first preset tunnel face along a first construction direction; Excavating a preset length of the newly added exhaust duct along a second direction on the first preset tunnel face to form a second preset tunnel face; At the same time, excavation and construction continue at the first preset tunnel face and the second preset tunnel face to the corresponding sub-tunnel, so as to form at least two first target construction tunnel faces spaced apart in the extension direction of the corresponding sub-tunnel.

3. The tunnel construction method according to claim 2, characterized in that: The step of performing top construction on the corresponding sub-tunnel along the extension direction of the corresponding sub-tunnel at all the first target construction faces includes: At all the first target construction faces, top excavation is performed on the corresponding sub-tunnels along the small mileage extension direction of the corresponding sub-tunnels to construct a first target length, so as to form a first section to be supported; Continue to perform top excavation construction of the corresponding sub-tunnel to a second target length along the long mileage direction of the corresponding sub-tunnel on all the first template construction faces, so as to form a second section to be supported that is interconnected with the first section to be supported; Support and excavation construction are performed on the first section to be supported and the second section to be supported.

4. The tunnel construction method according to claim 3, characterized in that: The step of supporting and excavating the first section to be supported and the second section to be supported includes: Performing support construction on the top of the first section to be supported and the top of the second section to be supported; Continue excavation work in the area where the cantilever construction has been completed.

5. The tunnel construction method according to claim 4, characterized in that: The step of performing support construction on the top of the first section to be supported and the top of the second section to be supported includes: A plurality of arc-shaped support structures are installed on the cantilever of the first section to be supported and the cantilever of the second section to be supported according to target spacings and concrete is sprayed to carry out support construction.

6. The tunnel construction method according to claim 5, characterized in that: After the top of the connecting air duct in the large mileage direction is completed, first construct 10m in the large mileage direction, turn around and construct the connecting air duct to the newly added air duct section, and after constructing 10m in the small mileage direction, the large and small mileages will be simultaneously bottomed out to form a closed loop, with the large mileage direction being the main construction direction.

7. The tunnel construction method according to claim 5, characterized in that: After the construction of the connecting air duct section is completed, the construction of the connecting air duct between the left and right lines will be carried out.

8. The tunnel construction method according to claim 5, characterized in that: Through the connecting air duct between the left and right lines, the top is lifted in the direction of the right line with large mileage; After the left line small mileage construction reaches the vehicle tunnel, the vehicle tunnel construction will be carried out after the vehicle tunnel invert arch construction is completed.

9. The tunnel construction method according to claim 5, characterized in that: After the top construction of the right line with large mileage is completed, first construct 10m in the direction of the large mileage, then turn around and construct 10m in the direction of the small mileage, and then the large and small mileages will be simultaneously completed to form a closed loop, with the construction in the direction of the large mileage as the main focus.

10. The tunnel construction method according to claim 5, characterized in that: After the vehicle cross tunnel is penetrated, the vehicle cross tunnel is used to lift the roof in the direction of the short mileage of the right line. After the lifting is completed, construction is carried out in the direction of the short mileage.

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