An airport flight area underpass tunnel non-stop construction survey method

Abstract

The application discloses a kind of methods for underpass tunnel construction surveying without stopping in airport flight area, comprising the following steps: first, according to the survey tunnel design line profile scheme, preliminary survey data and lining segment design scheme, the construction of survey tunnel with outer diameter D of 4m-6m is carried out, and the arrangement of survey tunnel drilling hole and the angle of drilling hole are determined; then, according to the survey drilling implementation scheme prepared according to the survey scheme, the survey drilling operation of underpass tunnel is carried out in the survey tunnel hole; finally, according to the actual survey drilling operation implementation, in-situ test and indoor test data, the formal survey report is prepared, and the survey drilling operation in the survey tunnel hole is realized, which realizes the construction without stopping in airport flight area, effectively increases the survey operation time, avoids the damage to the pavement area caused by ground drilling operation, and reduces the management work of personnel entering and exiting the flight area.

Description

Technical Field

[0001] This invention belongs to the field of exploration technology, specifically relating to a method for conducting exploration for underpass tunnel construction in airport flight zones without interrupting flight operations. Background Technology

[0002] Currently, with the rapid development of airport passenger and cargo throughput, the number of new construction and expansion projects at civil aviation airports is increasing daily. The introduction of rail transit, intercity railways, and other transportation modes into airports is becoming increasingly common, leading to a surge in demand for internal airport service lanes. Consequently, the number of underpass tunnel projects within airport flight areas is increasing dramatically, becoming a key and challenging issue in airport expansion and renovation projects. Prior to underpass tunnel construction, surveying work is necessary, and surveying techniques are crucial to ensuring the smooth implementation of underpass tunnel projects within airport flight areas.

[0003] Existing domestic and international engineering case studies mainly utilize existing borehole data from previous runway projects or conduct ground drilling operations, which presents the following problems:

[0004] 1) Existing exploration boreholes in the airport flight area are mainly distributed in the runway, taxiway and other pavement areas. The boreholes are shallow and cannot meet the technical requirements for exploration boreholes for underpasses with greater depth.

[0005] 2) When the underpass tunnel crosses the main runway of the flight area and there is no backup runway, it is necessary to implement flight suspension measures. However, the use of the flight suspension drilling method will have a great impact on airports with high service standards at present, seriously affecting the quality of airport flight services. Moreover, the approval process is lengthy and not conducive to the progress of project construction.

[0006] 3) The implementation of non-stop ground drilling requires various safety measures and is subject to extremely harsh conditions. The application and approval process is complex and requires close cooperation among various departments, making it impractical.

[0007] Therefore, a new technology is needed to solve the problem that existing technologies cannot meet the requirement of conducting uninterrupted survey and construction of underpass tunnels in airport flight zones at greater burial depths. Summary of the Invention

[0008] To address the aforementioned problems in the prior art, this invention provides a method for conducting uninterrupted construction surveys of underpass tunnels in airport flight zones, which effectively satisfies the requirement of conducting uninterrupted surveys and construction of underpass tunnels in airport flight zones at greater burial depths.

[0009] The present invention adopts the following technical solution:

[0010] A method for conducting on-site investigation for uninterrupted construction of underpass tunnels in airport flight zones includes the following steps:

[0011] S1. Construction Survey Tunnel:

[0012] S11. Determine the outer diameter D of the exploration tunnel based on the clearance requirements of the geological drilling equipment and the existing shield tunneling equipment. The outer diameter D of the exploration tunnel is 4m~6m.

[0013] S12. Design and survey the horizontal and vertical profile of the tunnel route: Based on the existing borehole data of the airport runway, clarify the geological and hydrological conditions of the shallow area below the runway and the plan layout of the underpass tunnel to be built, and design and survey the horizontal and vertical profile of the tunnel route.

[0014] S13. Design of exploration tunnel lining segments: Based on the selected geological drilling equipment, existing exploration data and exploration tunnel route, design the exploration tunnel lining segments, and determine the layout of exploration tunnel boreholes and borehole erection angles according to the horizontal and vertical profile scheme of the underpass tunnel route and the exploration scheme.

[0015] S14. Conduct tunnel construction based on the horizontal and vertical profile scheme of the tunnel design route, preliminary survey data, and lining segment design scheme.

[0016] S2. Conduct exploration and drilling operations for the underpass tunnel:

[0017] S21. According to the requirements of exploration and drilling operations, a movable exploration and drilling operation equipment shall be installed in the completed exploration tunnel. The height of the working platform of the exploration and drilling operation equipment shall be adjustable.

[0018] S22. Prepare an implementation plan for exploration drilling inside the exploration tunnel based on the exploration plan;

[0019] S23. According to the drilling implementation plan, drilling equipment is used to complete core drilling and various in-situ tests through vertical and oblique drilling methods;

[0020] S24. Based on the drilling angle and geological core sampling conditions implemented on site, convert the oblique drilling parameters into vertical geological drilling parameters, and draw geological profiles of various types according to the vertical drilling parameters;

[0021] S25. Conduct indoor tests on various geological parameters based on core sampling results to obtain the rock and soil mechanical parameters of each stratum;

[0022] S26. Based on the implementation of exploration drilling, in-situ testing, and laboratory test data, a formal exploration report shall be prepared.

[0023] As a further improvement to the technical solution of the present invention, in step S11, the clearance requirement h is 2m~4m.

[0024] As a further improvement to the technical solution of the present invention, in step S12, the burial depth H of the exploration tunnel is not less than one tunnel diameter, the distance L between the bottom of the exploration tunnel and the burial depth line of the existing exploration borehole is not less than one tunnel diameter, and the starting receiving well of the exploration tunnel and the working well of the underpass tunnel are set together.

[0025] As a further improvement to the technical solution of the present invention, in step S13, the drilling hole erection angle is not less than 30°, and corresponding drilling holes are reserved on the lining segments of the exploration tunnel.

[0026] As a further improvement to the technical solution of the present invention, in step S14, construction monitoring is carried out during the construction of the exploration tunnel. The construction monitoring includes automated monitoring and manual monitoring. The automated monitoring adopts a total station without prism scanning method, and manual monitoring sections are arranged in the axial and vertical axis directions of the exploration tunnel.

[0027] As a further improvement to the technical solution of the present invention, synchronous grouting and secondary grouting are used to control the settlement of the flight area pavement during the construction monitoring process.

[0028] As a further improvement to the technical solution of the present invention, in step S14, the exploration tunnel under the airport flight area pavement includes a test section, a crossing section and a protection section in sequence. The test section is 45m to 55m long and is used to determine the parameters of the exploration tunnel crossing the pavement area in order to control the settlement of the flight area pavement.

[0029] The protection section is 25m to 35m long and is used to enhance the control of shield tunneling construction parameters.

[0030] The length of the crossing section is determined based on the actual site conditions.

[0031] As a further improvement to the technical solution of the present invention, in step S21, the height of the working platform is 0.8m to 1m from the bottom of the exploration tunnel.

[0032] As a further improvement to the technical solution of the present invention, in step S22, when preparing the exploration and drilling implementation plan, the location of the reserved drilling hole for the lining segment is checked to see if it meets the requirements. If it does not meet the requirements, the hole is drilled on site according to the actual plan. The drilling location avoids the location of the reinforcing steel bar of the lining segment.

[0033] As a further improvement to the technical solution of the present invention, in step S23, before drilling and coring, a check valve device is installed at the drilling hole, and after drilling is completed, the hole is backfilled and sealed and leaks are plugged in a timely manner.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] This plan outlines a pre-construction exploration and drilling method for an underpass tunnel in the airport's flight area. It involves first constructing a survey tunnel, then conducting exploration and drilling operations within it. Following the drilling implementation plan, drilling equipment is used to complete core sampling and various in-situ tests via vertical and oblique drilling methods. This completes the pre-construction exploration and drilling work for the airport's flight area underpass tunnel, enabling uninterrupted construction within the airport's flight area. This effectively reduces the impact of airport expansion and renovation projects on normal airport operations. While ensuring airport operational safety, it enriches the existing exploration technology system for the airport's flight area and improves the safety of uninterrupted operations. It also ensures the feasibility of subsequent underpass tunnel construction. Exploration and drilling operations can be carried out 24 / 7 within the survey tunnel, effectively increasing the duration of exploration work. Drilling within the survey tunnel avoids damage to the pavement caused by ground drilling operations, thus avoiding issues such as pavement repair and runway go-around testing. Furthermore, it avoids ground-level construction work within the airport's flight area, reducing the management of personnel entering and exiting the flight area. Attached Figure Description

[0036] The technology of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0037] Figure 1 This is a cross-sectional view of the overall structure of the present invention.

[0038] Figure label:

[0039] 1-Airfield pavement;

[0040] 2-Exploration tunnel; 21-Exploration tunnel burial depth H; 22-Working platform;

[0041] 3- Underpass tunnel;

[0042] 4- Existing exploration borehole bottom depth line; 41- Distance L. Detailed Implementation

[0043] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The same reference numerals used throughout the accompanying drawings indicate the same or similar parts.

[0044] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "up," "down," "left," and "right" used in this invention are only relative to the relative positional relationships of the various components of the invention in the accompanying drawings.

[0045] Reference Figure 1 A method for conducting on-site surveys for uninterrupted construction of underpass tunnels in airport flight zones includes the following steps:

[0046] S1. Construction survey of tunnel 2:

[0047] S11. Before construction, geological drilling equipment with the functions of inclined drilling and low clearance operation can be purchased based on the existing construction data. The clearance requirement h of the geological drilling equipment is 2m~4m. The outer diameter D of the exploration tunnel 2 is determined according to the clearance requirement of the geological drilling equipment and the existing shield machine equipment. The outer diameter D of the exploration tunnel 2 is 4m~6m. The smaller diameter of the exploration tunnel 2 meets the needs of the exploration operation. It is not necessary to design and construct an exploration tunnel 2 with a larger diameter, which is conducive to reducing construction costs. Shield tunnels can be preferred for exploration tunnel 2.

[0048] S12. Design of the horizontal and vertical profile of the exploration tunnel 2: Based on the existing borehole data of the airport runway, the geological and hydrological conditions of the shallow area below the runway and the plan layout of the underpass tunnel 3 to be built are clarified. The horizontal and vertical profile of the exploration tunnel 2 is designed. Under normal circumstances, the burial depth H21 of the exploration tunnel 2 shall not be less than one diameter of the exploration tunnel 2. The distance L41 between the bottom of the exploration tunnel 2 and the burial depth line 4 of the existing exploration borehole shall not be less than one diameter of the exploration tunnel 2. The launching and receiving shaft of the exploration tunnel 2 and the working shaft of the underpass tunnel 3 shall be set together.

[0049] S13. Design of lining segments for exploration tunnel 2: Based on the selected geological drilling equipment, existing exploration data and the route of exploration tunnel 2, design the lining segments for exploration tunnel 2, and determine the layout and drilling angle of the boreholes for exploration tunnel 2 according to the horizontal and vertical profile scheme and exploration scheme of the underpass tunnel 3. The drilling angle shall not be less than 30°. According to the requirement that the drilling angle shall not be less than 30°, corresponding boreholes shall be reserved on the lining segments of exploration tunnel 2.

[0050] S14. Construction of Tunnel 2 shall be carried out in accordance with the design plan of the horizontal and vertical cross-section of the exploration tunnel 2, the preliminary exploration data and the lining segment design plan. Construction monitoring shall be carried out during the construction of Tunnel 2, including automated monitoring and manual monitoring. The automated monitoring adopts the prism-free scanning method of the total station. Manual monitoring sections are arranged in the axial and vertical axis directions of Tunnel 2. During the construction monitoring, synchronous grouting and secondary grouting methods shall be used to control the settlement of the runway 1 in the flight area. The exploration tunnel 2 beneath the airport flight area pavement 1 comprises a test section, a crossing section, and a protection section. The test section, 45m-55m in length, is primarily used to determine parameters for the exploration tunnel 2 crossing the pavement area (the area of ​​airport flight area pavement 1). Through information-based feedback during construction, optimal values ​​for parameters such as face pressure, advance speed, muck discharge, grouting pressure, and grouting volume are obtained to control settlement of flight area pavement 1. The protection section, 25m-35m in length, is used to enhance the control of construction parameters for exploration tunnel 2. The length of the crossing section is determined based on actual site conditions. During construction of the main areas of the crossing section, its length can be determined by the range from the time the tunnel boring machine cutterhead reaches one diameter of exploration tunnel 2 in the pavement area to the time the shield tail exits one diameter of exploration tunnel 2 in the pavement area. During the construction of exploration tunnel 2, attention must also be paid to the lining segment assembly points to ensure that the reserved drilling hole locations can meet subsequent exploration requirements.

[0051] Construction monitoring of Tunnel 2 employs a combination of automated and manual monitoring. Automated monitoring requires the pre-positioning of reflective sheets in the pavement area, followed by automatic prism-free scanning of the measurement area using a total station. Settlement monitoring data is obtained by comparing the changes in measurement data during construction with the initial measurement data. Manual monitoring requires the placement of monitoring sections along the axial and vertical axes of Tunnel 2, with manual monitoring conducted once daily after airport closure. Accuracy is ensured through cross-checking of manual and automated monitoring data. The airport pavement settlement control limits are as follows: the height difference within a 3-meter range of the cement concrete pavement should not exceed 10 mm; the misalignment of slab joints should not exceed 5 mm, and the total settlement should not exceed 30 mm. Furthermore, the runway differential settlement rate should not exceed 1‰, and the taxiway differential settlement rate should not exceed 1.5‰.

[0052] S2. Conduct exploration and drilling operations for the underpass tunnel 3:

[0053] S21. According to the requirements of the exploration drilling operation, a movable exploration drilling operation equipment is installed in the completed exploration tunnel 2. The exploration drilling operation equipment can move in the exploration tunnel 2 and meet the requirements of inclined drilling, ensuring that the inclined drilling is convenient. The height of the working platform 22 of the exploration drilling operation equipment is adjustable. The height of the working platform 22 is 0.8m to 1m from the bottom of the exploration tunnel 2 to facilitate the smooth progress of the exploration drilling operation.

[0054] S22. Prepare an exploration drilling implementation plan for the exploration tunnel 2 based on the exploration plan. Determine the location of boreholes within the exploration tunnel 2. Based on the exploration scope and final drilling principles required by the exploration technology, determine the layout of boreholes within the exploration tunnel 2, including parameters such as borehole drilling angle and drill rod extension length. When preparing the exploration drilling implementation plan, verify whether the reserved borehole locations for the lining segments meet the requirements. If they do not meet the requirements, drill holes on-site according to the actual plan to avoid deviations in the reserved borehole locations for the lining segments that could adversely affect the exploration drilling operation. The borehole locations should avoid the locations of the reinforcing steel bars in the lining segments.

[0055] S23. According to the drilling implementation plan, drilling equipment will be used to complete core sampling and various in-situ tests through vertical and oblique drilling. Before core sampling, a check valve will be installed at the drill hole. After drilling, the hole will be backfilled and sealed promptly to prevent leaks. The check valve will prevent gushing during the exploration drilling process. Core sampling will be completed through vertical and oblique drilling, and in-situ tests such as standard penetration test, wave velocity test, and apparent resistivity test will be performed. Drilling is then completed. After backfilling and filling all boreholes to ensure sealing quality, ordinary silicate cement grout with a water-cement ratio of 0.5:1 to 0.7:1 can be used for grouting and sealing. During sealing, the cement grout is poured from bottom to top. After drilling, the casing is not removed; the drill rod is lowered, and cement grout is pumped when the lower part of the drill rod is about 0.5m from the bottom of the hole. Pumping is stopped when the grout returns to the casing at the borehole opening, and the casing is then pulled out. After all the casings are pulled out, the area 0.2m below the borehole opening is filled with cement mortar, and the borehole is sealed to prevent leakage. Exploration drilling operations can be carried out around the clock within Exploration Tunnel 2, effectively increasing the exploration time and allowing for a comprehensive exploration before the construction of Underpass Tunnel 3, thus ensuring the feasibility of the Underpass Tunnel 3 project. In addition, drilling exploration inside the exploration tunnel 2 avoids damage to the pavement area caused by ground drilling operations, thereby avoiding subsequent pavement repairs and runway go-around tests. Since no construction work is carried out on the ground of the airport flight area, the management of personnel entering and leaving the flight area is reduced.

[0056] S24. Based on the drilling angle and geological core sampling conditions implemented on site, convert the axial borehole parameters into vertical geological borehole parameters, draw various types of geological profiles according to the vertical borehole parameters, and convert the axial borehole parameters into vertical borehole parameters according to the relationship H0=L0×sin(α), where H0 is the thickness of a certain stratum, L0 is the core sampling length of a certain stratum, and α is the drilling angle. Draw borehole column diagrams according to the vertical borehole parameters, and connect the geological lines to draw geological profiles.

[0057] S25. Conduct various geological parameter laboratory tests based on the borehole core sampling results, such as conventional soil tests, special tests, water quality analysis tests, soluble salt tests, thermophysical tests, rock point load tests, rock uniaxial compressive elastic modulus tests, rock shear tests, and other geological parameter laboratory tests to obtain the soil and rock mechanical parameters of each stratum;

[0058] S26. Based on the implementation of exploration drilling, in-situ testing, and laboratory test data, a formal exploration report shall be prepared.

[0059] This plan involves conducting pre-construction exploration drilling within the exploration tunnel 2 for the airport flight area underpass tunnel 3, enabling uninterrupted construction within the airport flight area. This effectively reduces the impact of airport expansion and renovation projects on normal airport operations. While ensuring airport operational safety, it enriches the existing exploration technology system for the airport flight area and improves the safety of uninterrupted operations. It also ensures the feasibility of subsequent construction of the flight area underpass tunnel 3.

[0060] Other aspects of the method for conducting uninterrupted construction surveys of underpass tunnels in airport flight zones described in this invention are found in existing technologies and will not be repeated here.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for conducting on-site investigation for uninterrupted construction of underpass tunnels in airport flight zones, characterized in that: Includes the following steps: S1. Construction Survey Tunnel: S11. Determine the outer diameter D of the exploration tunnel based on the clearance requirements of the geological drilling equipment and the existing tunnel boring machine equipment. The outer diameter D of the exploration tunnel is 4m~6m, and the clearance requirement h is 2m~4m. S12. Design of the horizontal and vertical profile of the exploration tunnel: Based on the existing borehole data of the airport runway, clarify the geological and hydrological conditions of the shallow area below the runway and the plan layout of the underpass tunnel to be built, and design the horizontal and vertical profile of the exploration tunnel; the burial depth H of the exploration tunnel shall not be less than one tunnel diameter, the distance L between the bottom of the exploration tunnel and the burial depth line of the existing exploration borehole shall not be less than one tunnel diameter, and the starting and receiving shaft of the exploration tunnel shall be combined with the working shaft of the underpass tunnel. S13. Design of exploration tunnel lining segments: Based on the selected geological drilling equipment, existing exploration data and exploration tunnel route, design the exploration tunnel lining segments, and determine the layout of exploration tunnel boreholes and borehole erection angles according to the horizontal and vertical profile scheme of the underpass tunnel route and the exploration scheme. S14. The exploration tunnel is constructed according to the horizontal and vertical cross-section scheme of the exploration tunnel design line, the preliminary exploration data and the lining segment design scheme. The exploration tunnel under the airport flight area pavement includes a test section, a crossing section and a protection section in sequence. The test section is 45m to 55m long and is used to determine the parameters of the exploration tunnel crossing the pavement area in order to control the settlement of the flight area pavement. The protection section is 25m to 35m long and is used to enhance the control of shield tunneling construction parameters. The length of the crossing section is determined based on the actual site conditions; S2. Conduct exploration and drilling operations for the underpass tunnel: S21. According to the requirements of exploration and drilling operations, a movable exploration and drilling operation equipment shall be installed in the completed exploration tunnel. The height of the working platform of the exploration and drilling operation equipment shall be adjustable, and the height of the working platform shall be 0.8m to 1m from the bottom of the exploration tunnel. S22. Prepare an exploration drilling implementation plan for the exploration tunnel based on the exploration plan; determine the location of boreholes in the exploration tunnel; determine the layout of boreholes in the exploration tunnel, the drilling angle and drill rod extension length parameters based on the exploration scope and final drilling principle required by the exploration technology; and verify whether the reserved borehole locations for the lining segments meet the requirements when preparing the exploration drilling implementation plan. S23. According to the drilling implementation plan, drilling equipment is used to complete core drilling and various in-situ tests through vertical and inclined drilling. Before core drilling, a check valve device is installed at the drill hole. After drilling, the hole is backfilled and sealed in a timely manner to prevent leakage. The check valve device is installed to prevent gushing during the exploration drilling process. After drilling, all drill holes are backfilled and the sealing quality is ensured. Ordinary Portland cement grout with a water-cement ratio of 0.5:1 to 0.7:1 can be used for grouting and sealing. S24. Based on the drilling angle and geological core sampling conditions implemented on site, convert the oblique drilling parameters into vertical geological drilling parameters, and draw geological profiles of various types according to the vertical drilling parameters; S25. Conduct indoor tests on various geological parameters based on core sampling results to obtain the rock and soil mechanical parameters of each stratum; S26. Based on the implementation of exploration drilling, in-situ testing, and laboratory test data, a formal exploration report shall be prepared.

2. The method for conducting on-site investigation for uninterrupted construction of underpass tunnels in airport flight zones according to claim 1, characterized in that: In step S13, the drilling angle is not less than 30°, and corresponding drilling holes are reserved on the tunnel lining segments.

3. The method for conducting on-site investigation for uninterrupted construction of underpass tunnels in airport flight zones according to claim 1, characterized in that: In step S14, construction monitoring is carried out during the tunnel construction process. The construction monitoring includes automated monitoring and manual monitoring. The automated monitoring adopts a total station without prism scanning method. Manual monitoring sections are arranged in the axial and vertical axis directions of the tunnel.

4. The method for conducting on-site investigation for uninterrupted construction of underpass tunnels in airport flight zones according to claim 3, characterized in that: During construction monitoring, synchronous grouting and secondary grouting methods were used to control the settlement of the runway surface in the flight area.

5. The method for conducting on-site investigation for uninterrupted construction of underpass tunnels in airport flight zones according to claim 1, characterized in that: In step S21, the working platform is 0.8m to 1m above the bottom of the tunnel.

6. The method for conducting on-site investigation for uninterrupted construction of underpass tunnels in airport flight zones according to claim 1, characterized in that: In step S22, when preparing the exploration and drilling implementation plan, it is necessary to check whether the reserved drilling hole positions of the lining segments meet the requirements. If the requirements are not met, drilling should be carried out on site according to the actual plan. The drilling positions should avoid the positions of the reinforcing steel bars of the lining segments.

7. The method for conducting on-site investigation for uninterrupted construction of underpass tunnels in airport flight zones according to claim 1, characterized in that: In step S23, before drilling and coring, a check valve is installed at the drill hole. After drilling is completed, the hole is backfilled and sealed to prevent leakage.

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