TBM assembly and launching method in narrow sites

Abstract

The present invention application discloses a TBM assembly and launching method in a narrow site, which mainly includes the following steps: preliminarily determining the planned excavation length of the drilling and blasting tunnel section; adjusting the length of the TBM continuous belt conveyor in the tunnel based on the TBM launching node, and determining the planned excavation length of the drilling and blasting tunnel section after the belt conveyor length is optimized; calculating the remaining excavation length of the drilling and blasting tunnel section, and determining the actual excavation length of the drilling and blasting tunnel section; judging the relationship between the front surrounding rock grade and the time used for excavation support and the time when the TBM first steps into and blocks the tunnel opening; if the time node of the TBM first steps into and blocks the tunnel opening is met, there is no need to dynamically adjust the actual excavation length of the drilling and blasting tunnel section; if the time node of the TBM first steps into and blocks the tunnel opening is not met, the actual excavation length of the drilling and blasting tunnel section is dynamically adjusted. The present application dynamically adjusts the construction progress of the drilling and blasting tunnel section through the TBM assembly progress, so as to balance the risk of delays in the construction period between the drilling and blasting work and the TBM launching, and ensure that the tunnel engineering project is successfully completed according to the construction schedule, improve construction efficiency, and reduce construction costs.

Description

Technical Field

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

[0002] At present, the excavation methods commonly used in tunnel construction are mainly drilling and blasting and TBM. The drilling and blasting method has the advantages of good flexibility and high mobility, but it is difficult to meet the construction period requirements when facing the construction of super-long mountain tunnels; the TBM construction method has the advantages of good safety, low labor intensity, and high construction speed, but it still has problems such as passive handling and slow response when facing poor geological sections. Therefore, in the existing tunnel construction, the TBM method and the drilling and blasting method are often used in combination for construction, giving full play to the advantages of the two construction methods, and realizing safe, fast and economical tunnel construction. However, most tunnel projects are located between mountains, with steep terrain and narrow assembly sites outside the tunnel. There is often a phenomenon that the original design assembly site plus the length of the step-in hole cannot guarantee the installation of the TBM and the continuous belt conveyor. How to dynamically adjust the length of the step-in hole in the drilling and blasting section to match the length of the TBM continuous belt conveyor and TBM equipment is crucial to ensure the rapid assembly and start of the TBM in a narrow site, so as to solve the technical problems of small installation site, tight construction period and high construction cost during the construction of tunnel projects.

[0003] However, in the process of implementing the technical solution in the embodiments of the present application, the inventors of the present application found that there are at least the following technical problems: although the combination of TBM method and drilling and blasting method for tunnel construction can better play the advantages of the two construction methods and effectively improve the construction efficiency, it is difficult to dynamically adjust the drilling and blasting construction progress according to the TBM assembly progress to match the two construction methods and effectively solve the problems of small installation site and tight construction period.

[0004] The information disclosed in this background technology section is only used to deepen the understanding of the background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0005] The present invention provides a TBM assembly and launching method in a narrow site, which dynamically adjusts the drilling and blasting construction progress according to the TBM assembly progress, so that the drilling and blasting section construction meets the requirements of TBM installation and stepping.

[0006] The present application discloses a TBM assembly and launching method in a narrow site, comprising the following steps: (1) Based on the length of the TBM equipment, the length of the TBM continuous belt conveyor, and the length of the continuous belt conveyor outside the drilling and blasting hole and the length of the continuous belt conveyor inside the drilling and blasting hole divided by the corresponding project, preliminarily determine the planned excavation length of the drilling and blasting hole section; (2) Based on the requirements of the TBM starting node, the length of the TBM continuous belt conveyor in the tunnel is adjusted to leave a dynamic adjustment section in the drilling and blasting tunnel so that the TBM assembly and drilling and blasting construction do not interfere with each other, and the planned excavation length of the drilling and blasting tunnel section after the TBM continuous belt conveyor length is optimized is determined again; (3) Based on the excavated length of the drilling and blasting tunnel section, the daily excavation footage of the drilling and blasting tunnel section, the completed length of the invert casting, the daily footage of the invert casting, the daily footage of the synchronous casting of the invert and excavation, and the remaining construction time of the drilling and blasting tunnel section, the remaining excavation length of the drilling and blasting tunnel section is calculated to determine the actual excavation length of the drilling and blasting tunnel section; (4) Use advanced geological forecasts to survey the construction site and determine the relationship between the surrounding rock grade and the time required for excavation and support and the time for the first TBM step to seal the tunnel entrance; (5) If the time node for the first step of TBM to seal the tunnel entrance is met, there is no need to dynamically adjust the actual excavation length of the drilled and blasted tunnel section; if the time node for the first step of TBM to seal the tunnel entrance is not met, the actual excavation length of the drilled and blasted tunnel section is dynamically adjusted according to the calculation method in step (3).

[0007] In some embodiments of the present disclosure, in the step (1), the planned excavation length of the drill and blast tunnel section preliminarily determined is the sum of the length of the TBM equipment and the length of the TBM continuous belt conveyor in the tunnel.

[0008] In some embodiments of the present disclosure, in the step (2), the planned excavation length of the drilling and blasting tunnel section after the TBM continuous belt conveyor length is determined to be the sum of the TBM equipment length and the optimized in-tunnel length of the TBM continuous belt conveyor.

[0009] In some embodiments of the present disclosure, in step (3), the remaining excavation length of the drilled and blasted hole section is calculated as follows: L 2 / L K +( L 1+ L 2- Y 1- L 2 / L K * LY 1) / LY 2= D ; In the formula, L 1 is the excavated length of the drill and blast hole section; L 2 is the remaining excavation length of the drilling and blasting section; L K Daily excavation footage for drilling and blasting hole sections; Y 1 is the completed length of the invert casting; LY 1 is the daily progress of synchronous pouring of invert and excavation; LY2 is the daily progress of invert casting; D The remaining construction time for the drilling and blasting section.

[0010] In some embodiments of the present disclosure, in step (3), the actual excavation length of the drill hole section determined is the sum of the excavated length of the drill hole section and the remaining excavation length of the drill hole section.

[0011] In some embodiments of the present disclosure, the actual excavation length of the drill and blast tunnel section is dynamically adjusted multiple times according to the advanced geological forecast combined with the surrounding rock conditions of the tunnel excavation.

[0012] One or more technical solutions provided in the embodiments of the present application have at least any of the following technical effects or advantages: 1. By rationally optimizing the length of the TBM continuous belt conveyor, the construction length of the drilling and blasting tunnel section is shortened, leaving a section for dynamic adjustment of the drilling and blasting tunnel section. While ensuring the TBM starting node, the TBM installation and tunnel construction will not interfere with each other, ensuring that the tunnel construction is completed on time when the TBM is stepped forward.

[0013] 2. Dynamically adjust the drilling and blasting construction progress through the TBM assembly progress, so that the drilling and blasting section construction matches the TBM installation and stepping, so as to improve the efficiency of tunnel construction, shorten the construction period, and ensure that the project is completed as planned.

[0014] 3. Through advanced geological forecasting and the surrounding rock conditions of tunnel excavation, the actual excavation length of the drilling and blasting section is optimized and adjusted multiple times to avoid the risk of delays in the drilling and blasting work and TBM start-up. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a flow chart of a TBM assembly start-up method in a narrow site in one embodiment of the present application.

[0016] Figure 2 This is a schematic diagram of the TBM assembly site layout in one embodiment of the present application.

[0017] Figure 3 This is a schematic diagram of the time arrangement for the cross-operation of drilling and blasting construction and TBM transportation and assembly in one embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the scope of the present invention in any way.

[0019] This example discloses a TBM assembly and launching method in a narrow site. Figure 1 , including the following steps: (1) Based on the length of the TBM equipment, the length of the TBM continuous belt conveyor, and the length of the continuous belt conveyor outside the drilling and blasting hole and the length of the continuous belt conveyor inside the drilling and blasting hole divided by the corresponding project, preliminarily determine the planned excavation length of the drilling and blasting hole section; (2) Based on the requirements of the TBM starting node, the length of the TBM continuous belt conveyor in the tunnel is adjusted to leave a dynamic adjustment section in the drilling and blasting tunnel so that the TBM assembly and drilling and blasting construction do not interfere with each other. The planned excavation length of the drilling and blasting tunnel section after the TBM continuous belt conveyor length is optimized is determined again. (3) Based on the excavated length of the drilling and blasting tunnel section, the daily excavation footage of the drilling and blasting tunnel section, the completed length of the invert casting, the daily footage of the invert casting, the daily footage of the synchronous casting of the invert and excavation, and the remaining construction time of the drilling and blasting tunnel section, the remaining excavation length of the drilling and blasting tunnel section is calculated to determine the actual excavation length of the drilling and blasting tunnel section; (4) Use advanced geological forecasts to survey the construction site and determine the relationship between the surrounding rock grade and the time required for excavation and support and the time for the first TBM step to seal the tunnel entrance; (5) If the time node for the first step of TBM to seal the tunnel entrance is met, there is no need to dynamically adjust the actual excavation length of the drilled and blasted tunnel section; if the time node for the first step of TBM to seal the tunnel entrance is not met, the actual excavation length of the drilled and blasted tunnel section is dynamically adjusted according to the calculation method in step (3).

[0020] Specifically in this embodiment, the TBM belt bin is arranged from the slag yard outside the tunnel to the inside of the tunnel. The project divides the length of the belt conveyor inside and outside the tunnel according to the total length of the TBM continuous belt conveyor. The belt bin winch is located at the tail end of the belt bin in the tunnel, and the widest part of the winch is located at the centerline of the tunnel. Due to limited space in the tunnel, the position of the belt bin winch cannot be optimized, and the winch can only be installed after the TBM steps through.

[0021] Furthermore, in order to ensure the TBM starting node required by the construction unit, the length of the TBM continuous belt conveyor is optimized, that is, the total length of the continuous belt conveyor is shortened, thereby shortening the planned excavation length of the drilling and blasting tunnel section. According to the dynamic adjustment of the drilling and blasting construction progress and the TBM installation progress, the drilling and blasting construction is more flexible, leaving a section for dynamic adjustment of the drilling and blasting tunnel section, so that the installation and tunnel construction will not interfere with each other, and there will be no stoppage or idle work in the installation tunnel, and the tunnel construction will not be completed during stepping, and it can also effectively reduce the construction cost of the project.

[0022] More specifically, the actual excavation length of the drilling and blasting section is determined based on the TBM assembly progress, the drilling and blasting section construction progress and the surrounding rock conditions of the tunnel excavation, and it is dynamically adjusted according to the drilling and blasting construction progress in the current time period to ensure that the tunnel engineering construction project is successfully completed as planned, which can not only improve construction efficiency and shorten construction period, but also greatly reduce construction costs.

[0023] In some embodiments, in step (1), the planned excavation length of the drill and blast tunnel section is preliminarily determined to be the sum of the length of the TBM equipment and the length of the TBM continuous belt conveyor in the tunnel.

[0024] In a further embodiment, in step (2), the planned excavation length of the drilling and blasting tunnel section after the TBM continuous belt conveyor length is optimized is determined as the sum of the TBM equipment length and the optimized tunnel length of the TBM continuous belt conveyor. By reducing the total length of the continuous belt conveyor, the planned excavation length of the drilling and blasting tunnel section is shortened to ensure that the TBM excavates and seals the tunnel entrance as planned.

[0025] In a further embodiment, in step (3), the remaining excavation length of the drilled and blasted hole section is calculated as follows: L 2 / L K +( L 1+ L 2- Y 1- L 2 / L K * LY 1) / LY 2= D ; In the formula, L 1 is the excavated length of the drill and blast hole section; L 2 is the remaining excavation length of the drilling and blasting section; L K Daily excavation footage for drilling and blasting hole sections; Y 1 is the completed length of the invert casting; LY 1 is the daily progress of synchronous pouring of invert and excavation; LY 2 is the daily progress of invert casting; D The remaining construction time for the drilling and blasting section.

[0026] In a further embodiment, in step (3), the actual excavation length of the drilled and blasted hole section is determined to be the sum of the excavated length of the drilled and blasted hole section and the remaining excavation length of the drilled and blasted hole section.

[0027] In a further embodiment, the actual excavation length of the drill and blast tunnel section is dynamically adjusted multiple times based on the advanced geological forecast and the surrounding rock conditions of the tunnel excavation to avoid situations such as drilling and blasting work and TBM start-up delays, thereby ensuring that the tunnel construction project is completed smoothly according to the schedule.

[0028] Application example 1: Take the JW cascade power station cross-mountain tunnel group Changmou cave exploration project as an example to explain the specific application 1. Project Overview: The entrance elevation of a cave project is about 2730m. It extends into the mountain along the slope, deflects upstream at an elevation of 2738m, and ends at a certain inclined shaft. The terminal elevation is 2800m. The total length of the cave is 5.366km (K0+091.3~K5+458, starting at K0+091.3). The first 330m is constructed by drilling and blasting, and the remaining sections are constructed by open TBM. The excavation diameter is 4.75m. The tunnel is excavated on a positive slope with a slope ratio of 0.3% and a turning radius of 600m.

[0029] 2. Limited TBM assembly site: The project is located in a national forest reserve with limited construction sites, and it is not possible to requisition additional land to expand the TBM assembly site. The available area of ​​the TBM equipment assembly site is 44m long and 56m wide, which is too small for assembling TBMs. It is difficult to place large TBM parts on site, and a crane unloading area of ​​about 20m must be reserved. Therefore, the longitudinal length of the entire assembly area is only about 30m. Before assembly, the site was planned and divided into an unloading area, a storage area, a hoisting area, and an assembly area. The assembly follows the principle of assembling while entering the site. However, the cutterhead, main drive, stepping mechanism, shield, main beam, etc. need to be brought to the site in advance, and the placement of large parts has been carefully and scientifically planned and arranged. For the layout of the TBM assembly site, please refer to Figure 2 .

[0030] 3. Engineering Difficulties (1) Dynamically adjust the length of the drilling and blasting section and the layout of the continuous belt conveyor The original design of the step hole length of the drilling and blasting section was 150m, the TBM assembly site was 60m, and the total length was 210m; the length of the TBM before transformation was 315m, the continuous belt length was 149m, and the total length was 464m. The original design of the assembly site plus the step hole length could not guarantee the installation of the TBM and the continuous belt conveyor. The length of the step hole in the drilling and blasting section needs to be adjusted according to the length of the TBM continuous belt conveyor and the TBM equipment.

[0031] (2) Dynamically control the drilling and blasting construction progress to match the TBM assembly progress The drilling and blasting construction progress is dynamically adjusted according to the TBM assembly progress. The construction of the drilling and blasting section must meet the requirements of TBM installation and stepping. The drilling and blasting excavation end mileage and the invert construction progress are controlled in combination with the progress of TBM transportation and assembly.

[0032] (3) Batch storage and assembly of TBM equipment in limited assembly sites The available area of ​​the TBM equipment assembly site is 44m long and 56m wide, which is too small for assembling TBMs. It is difficult to place large TBM parts on the site, and a crane unloading area of ​​about 20m must be reserved. The entire assembly area is only about 30m.

[0033] (4) Determination of the time and space relationship between the lifting of the main parts of the TBM equipment, the storage of the supporting equipment and the drilling and blasting construction The lifting of the main parts of the TBM equipment and the storage of supporting equipment require the assembly site at the tunnel entrance. The planned time for TBM transportation is 10 days. The installation of the TBM main engine starts from the second day of transportation, and it takes a total of 10 days until the TBM main engine first steps to block the tunnel entrance. The drilling and blasting section bottom laying construction is planned to be completed 7 days after the end of excavation. Considering the 1-day civilized construction time in the tunnel, that is, the drilling and blasting excavation and bottom laying pouring overlap with the TBM transportation and assembly, the construction vehicles are all operating at the tunnel entrance and the first-floor platform of the industrial square, and cross-operation. For the time arrangement of cross-operation, please refer to Figure 3 .

[0034] (5) Efficient assembly and commissioning of TBM within a limited time The main lifting work content of TBM includes: unloading and turning over the cutterhead and main drive; lifting of main beam, shield, support shoe propulsion cylinder, rear support, connecting bridge, rear supporting trolley and other components.

[0035] The unloading of the main drive, cutterhead and main beam 2 is done by a 130t truck crane (45 tons of counterweight) and a 100t truck crane (40 tons of counterweight). The hoisting of the main beam 2 is also done by two cranes.

[0036] 4. The TBM assembly and launching method in a narrow site mainly includes: (1) Preliminary determination of the planned excavation length of the drilling and blasting section The TBM belt bin is arranged from the slag yard outside the tunnel to the inside of the tunnel. According to the manufacturer's design requirements, the total length of the TBM continuous belt conveyor is 149m. The project is divided into two parts, namely, the length of the continuous belt conveyor outside the drilling and blasting tunnel is 44m, and the length of the continuous belt conveyor inside the drilling and blasting tunnel is 105m. The belt bin winch is located at the tail end of the belt bin in the tunnel (K0+197.9), and the widest part of the winch is located at the center line of the tunnel. Due to limited space in the tunnel, the position of the belt bin winch cannot be optimized, and the winch can only be installed after the TBM steps through. The length of the TBM equipment is 255m. Therefore, it is preliminarily determined that the planned excavation length of the drilling and blasting tunnel section is the length of the continuous belt conveyor in the drilling and blasting tunnel of 105m plus the length of the TBM equipment of 255m, a total of 360m.

[0037] (2) Determine the planned excavation length of the drilling and blasting section after the TBM continuous belt conveyor length is optimized In order to ensure that the TBM starts smoothly according to the construction schedule, the length of the continuous belt conveyor was optimized and further reduced from 149m to 119m. The planned excavation length of the drilling and blasting tunnel section after optimization was 330m, which can be dynamically adjusted according to the drilling and blasting construction progress and the TBM assembly progress. The drilling and blasting method is more flexible, and a section for dynamic adjustment of the drilling and blasting section is reserved, so that there will be no interference between the installation and the construction in the tunnel, and there will be no stoppage of work or idle work in the installation tunnel, and the construction in the tunnel will not be completed during stepping.

[0038] After optimizing the length of the TBM continuous belt conveyor, the planned excavation length of the drilling and blasting section was reduced by 30m, with a per-meter income excluding tax of 9,839 yuan and a per-meter cost of 33,962 yuan. Reducing one per-meter reduces losses by 24,125 yuan, and reducing the planned excavation length of the drilling and blasting section by 30 meters reduces losses by 723,750 yuan in total. Therefore, optimizing the planned excavation length of the drilling and blasting section can effectively reduce construction costs.

[0039] (3) Determine the actual excavation length of the drilling and blasting section The TBM is scheduled to be transported from the Paizhen storage point to the construction site on May 12, and will be assembled on May 14. The main engine will be assembled on May 23 and the first step will be made to block the tunnel entrance. After the tunnel entrance is blocked, the drilling and blasting construction will lose the working conditions. The drilling and blasting tunnel section excavation support and invert pouring operations must be completed on May 23. As of May 1, the drilling and blasting face mileage is K0+373.6, the cumulative excavation mileage is 280.3m, and the average daily excavation footage of the Class III surrounding rock is 4m. The advanced geological forecast shows that the Class IV surrounding rock will start from K0+380. The cumulative mileage of the invert pouring is K0+180.0, and the cumulative pouring mileage is 86.7m. The bottom pouring uses the invert trestle to pour 12m in two days. After the drilling and blasting excavation and support are completed, the invert trestle will be cancelled from the face to the tunnel entrance. The daily plan is to complete 36m. The results of advanced geological prediction: The longitudinal wave velocity of the section K0+380-K0+429 is 2500-3313 m / s, and the shear wave velocity is 1473-2163 m / s. The wave velocity of the surrounding rock in this section is significantly reduced, and there are many reflection interfaces. It is inferred that this section is Grade IV surrounding rock, with many joints and fissures, the rock mass strength may be reduced, local surrounding rock may collapse or fall off, and the integrity of the surrounding rock is poor.

[0040] Remaining excavation length of drilling and blasting section: L 2 / 4+(280.3+ L 2-86.7- L 2 / 4 / 2*12) / 36=21; L 2=66.1m; It is determined that the actual excavation length of the drilling and blasting section is 280.3+66.1=346.4m>330m. According to the current construction progress, the actual excavation length of the drilling and blasting section will be 346.4m on May 23. Considering that the first step-by-step advance will be carried out on the 22nd and 23rd to leave time for civilized construction, the length of the drilling and blasting section is set at 340m. According to the surrounding rock conditions of the tunnel excavation, if the arch frame is installed in the IV grade surrounding rock, the actual excavation length of the drilling and blasting section will be dynamically adjusted.

[0041] (4) Dynamically control the drilling and blasting construction progress to match the TBM assembly progress Conduct process analysis and optimization, strengthen process connection, and strive to complete the planned 4m of excavation support every day. On May 7, 2024, the exposed surrounding rock was mainly strip-shaped mixed gneiss, with developed joints and fissures, and long joints developed in the local arch. Affected by the long joints, the arch peeled off and formed a 1.6m deep collapse cavity. After on-site investigation by all parties, it was determined to excavate and support according to the IV level surrounding rock, and set up I16 steel arch frame + Φ42 small guide tube to strengthen the support on the whole section. The average daily advance is 2.4m. As of May 7, the cumulative excavation of drilling and blasting was 310.4m, and the cumulative bottom pouring was 112.7m. The bottom laying schedule remained unchanged. It is planned to simulate the TBM transportation route on May 8, and the TBM transportation will proceed as planned.

[0042] Remaining excavation length of drilling and blasting section: L 2 / 2.4+(310.4+ L 2-112.7- L 2 / 2.4 / 2*12) / 36=15; L 2 = 25.6m; It is determined that the actual excavation length of the drilling and blasting section is 310.4+25.6=336m>330m. According to the current construction progress, the drilling and blasting section will be completed with a construction length of 336m on May 23. Considering that the first advance will be carried out on the 22nd and 23rd to leave time for civilized construction, the length of the drilling and blasting section is set at 330m.

[0043] The TBM transportation started as planned on May 12 and continued as planned on May 23. On May 23, the cumulative excavation length of the drilling and blasting section reached 330m. The TBM transportation was carried out according to the construction schedule without any delay. According to the calculation, the excavation of the drilling and blasting section was stopped and resources were concentrated on the bottom pouring.

[0044] 5. Construction results (1) After a series of hardships and unremitting efforts during the TBM assembly process, which lasted 40 days, on June 24, as the cutterhead was close to the tunnel face and the continuous belt transported the slag to the slag yard outside the tunnel, the TBM trial excavation was successful, indicating that the TBM equipment assembly work was finally successfully completed. The problems of small installation site, tight construction period, and adjustment of the construction length of the drilling and blasting section were solved.

[0045] (2) The construction length of the drilling and blasting section was reduced by 93 m, reducing the total loss by RMB 2,243,625, which reduced the pressure on the project funds and ensured the funds during the installation period.

[0046] 6. Project Summary (1) The length of the TBM assembly site is equal to the length of the TBM mainframe plus the length of the TBM No. 1 bridge, which can meet the requirements of the TBM split assembly. The length of the TBM assembly site (minimum for split assembly) = the length of the TBM mainframe + the length of the TBM No. 1 bridge.

[0047] (2) For high-fill rockfill at the TBM assembly site, in the rainy season, the deformation rate reaches the maximum within 7 days, and becomes stable after 7 days, and concrete hardening can be carried out. The latest completion time of the site hardening = TBM assembly start point - 14 days (concrete equal strength) - 7 days.

[0048] (3) TBM step hole length ≥ TBM continuous belt length - outside the hole continuous belt length + TBM length. TBM step hole length equals TBM continuous belt length minus outside the hole continuous belt length plus TBM length to meet construction requirements.

[0049] (4) Pay attention to the preliminary preparation work. Consider the optimal length of the drilling and blasting step-in hole from the time of TBM modification and transportation. According to the construction period, the time and space for site construction and installation of TBM ancillary facilities should be reversed to optimize the most favorable time nodes for equipment installation and drilling and blasting construction. One day is reserved for the completion node of the drilling and blasting step-in hole and the space time for TBM assembly and step-in plugging drilling and blasting operations to meet the construction requirements. The optimal construction length can be optimized and comprehensively allocated based on the cost comparison between the drilling and blasting section and the TBM excavation section.

[0050] (5) Plan and arrange the site in advance, arrange the storage location of TBM accessories and number them and the transportation time in advance, save the transportation time of TBM small site assembly, improve assembly efficiency, and meet the requirements of short-term assembly.

[0051] (6) In view of the large-scale lifting of small sites and the frequent cross-operations, targeted safety measures are adopted to avoid safety accidents during construction, which may cause the installation work to be stalled. Targeted technical measures are adopted to carry out early detection of the bearing capacity of the access road and the bottom plate of the isolated rock overhead section of the stepping hole and the contour of the stepping hole to ensure the smooth progress of the TBM stepping process.

[0052] Although some preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0053] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the inventive concept. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A TBM assembly and launching method in a narrow site, characterized in that: The steps include: (1) Based on the length of the TBM equipment, the length of the TBM continuous belt conveyor, and the length of the continuous belt conveyor outside the drilling and blasting hole and the length of the continuous belt conveyor inside the drilling and blasting hole set for the corresponding project, preliminarily determine the planned excavation length of the drilling and blasting hole section; (2) Based on the requirements of the TBM starting node, the length of the TBM continuous belt conveyor in the tunnel is adjusted to leave a dynamic adjustment section in the drilling and blasting tunnel so that the TBM assembly and drilling and blasting construction do not interfere with each other, and the planned excavation length of the drilling and blasting tunnel section after the TBM continuous belt conveyor length is optimized is determined again; (3) Based on the excavated length of the drilling and blasting tunnel section, the daily excavation footage of the drilling and blasting tunnel section, the completed length of the invert casting, the daily footage of the invert casting, the daily footage of the synchronous casting of the invert and excavation, and the remaining construction time of the drilling and blasting tunnel section, the remaining excavation length of the drilling and blasting tunnel section is calculated to determine the actual excavation length of the drilling and blasting tunnel section; (4) Use advanced geological forecasts to survey the construction site and determine the relationship between the surrounding rock grade and the time required for excavation and support and the time for the first TBM step to seal the tunnel entrance; (5) If the time node for the first step of TBM to seal the tunnel entrance is met, there is no need to dynamically adjust the actual excavation length of the drilled and blasted tunnel section; if the time node for the first step of TBM to seal the tunnel entrance is not met, the actual excavation length of the drilled and blasted tunnel section is dynamically adjusted according to the calculation method in step (3).

2. The TBM assembly launching method according to claim 1, characterized in that: In the step (1), the planned excavation length of the drill-blast tunnel section is preliminarily determined to be the sum of the length of the TBM equipment and the length of the TBM continuous belt conveyor in the tunnel.

3. The TBM assembly launching method according to claim 1, characterized in that: In the step (2), the planned excavation length of the drill-blast tunnel section after the TBM continuous belt conveyor length is determined to be the sum of the TBM equipment length and the optimized tunnel length of the TBM continuous belt conveyor.

4. The TBM assembly launching method according to claim 1, characterized in that: In step (3), the remaining excavation length of the drilled and blasted hole section is calculated as follows: L 2 / L K +（ L 1+ L 2- Y 1- L 2 / L K * LY 1） / LY 2= D ； In the formula, L 1 is the excavated length of the drill and blast hole section; L 2 is the remaining excavation length of the drilling and blasting section; L K Daily excavation footage for drilling and blasting hole sections; Y 1 is the completed length of the invert casting; LY 1 is the daily progress of synchronous pouring of invert and excavation; LY 2 is the daily progress of invert casting; D The remaining construction time for the drilling and blasting section.

5. The TBM assembly launching method according to claim 4, characterized in that: In the step (3), the actual excavation length of the drill hole section is determined to be the sum of the excavated length of the drill hole section and the remaining excavation length of the drill hole section.

6. The TBM assembly launching method according to any one of claims 1 to 5, characterized in that: The actual excavation length of the drill and blast tunnel section is dynamically adjusted multiple times according to the advanced geological forecast and the surrounding rock conditions of the tunnel excavation.

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