High-precision deep hole drilling and correction construction process
Through the joint construction of multi-function drilling rig and rotary spray drilling rig, combined with the use of drag-reducing materials and quick-setting agent, the problem of verticality control of ultra-deep small diameter drilling in rheological soil layer is solved, and high-precision drilling construction is achieved .
Patent Information
- Application Number
- CN202411548019.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-02-18
AI Technical Summary
The prior art is difficult to effectively control the perpendicularity of ultra-deep small diameter drill holes, especially when encountering rheological soil layers.
The multi-functional drilling rig and the rotary spray drilling rig are used to jointly construct. By installing drag-reducing materials on the drilling drill pipe, the drilling rod can avoid the occurrence of drilling, and by adding a quick-coagulant, the solidification of the cured material is accelerated and the waiting time is shortened.
Effective reinforcement of rheological soil layer and high-precision control of drilling perpendicularity are achieved, and the problem of verticality exceeding the standard is solved.
Smart Images
Figure CN119465933A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of ultra-deep drilling construction, and in particular to a high-precision deep hole drilling and correction construction process. Background Art
[0002] High-pressure jet grouting piles spray cement slurry into the soil layer at high pressure through the slurry channel and nozzle in the drill rod, cut the soil, and fully mix the cement slurry and the in-situ soil. At the same time, the drill rod is rotated and lifted while spraying, thereby forming a high-pressure jet grouting pile. It is often used in fields such as foundation reinforcement and foundation pit water-stopping curtain. Its advantage is that it improves the material utilization rate of in-situ soil, can reinforce the soil layer of a specific depth, and reduce the cost of construction materials to a certain extent. However, before the construction of jet grouting piles, due to the complexity of the stratum, it is generally necessary to carry out the lead hole construction first, that is, first construct a small diameter borehole to the designed depth, and then put the jet grouting drill rod in and lift it for jet grouting. Therefore, the construction accuracy of small diameter boreholes is relatively high, especially the verticality requirement.
[0003] For some monitoring projects, such as the construction of monitoring holes for deep horizontal displacement, the construction of buried acoustic detection pipes, etc., it is still necessary to first construct small-diameter ultra-deep boreholes, and such boreholes still have high requirements for verticality.
[0004] However, for the above-mentioned various processes that require the use of small-diameter apertures for construction, the depth of existing hole-making technology is generally within 30m, and it is difficult to control the verticality well for ultra-deep boreholes. In order to fill the gap in hole-making technology for ultra-deep small-diameter boreholes, a targeted solution is created for the current problems of rheological soil layers and excessive verticality. Based on this, the present invention proposes a high-precision deep hole drilling and correction construction process. Summary of the invention
[0005] In order to address the deficiencies in the prior art, the present invention proposes a high-precision deep hole drilling and correction construction process, which solves the technical problems of rheological soil layers and excessive verticality by combining a rotary jet process or a grouting process with a drilling process; avoids the occurrence of drill sticking by arranging drag reducing materials on the drilling drill rod; and accelerates the solidification of the solidified material and shortens the waiting time by adding an accelerator.
[0006] The present invention adopts the following technical solution: A high-precision deep hole drilling and correction construction process, using a multi-functional drilling rig and a rotary jet drilling rig for joint construction. With the increase of construction depth, different treatment measures are taken for soil layers of different properties. The specific construction methods are as follows: When there are rheological clay layers and rheological silt soil layers within the construction depth, the construction measures adopted for these soil layers are: Step 1: Drilling through rheological clay and rheological silt layers Use a multifunctional drilling rig, with drilling rod and open-end drill bit, to extend the construction depth of the open-end drill bit through the rheological clay layer and rheological silt soil layer to ensure the verticality of the borehole; Step 2: Lower the jet jet drill rod The connection between the multifunctional drilling rig and the drilling rod is removed, and the drilling rod is clamped by the clamp of the multifunctional drilling rig; the jet grouting drilling rig is moved to the drilling hole and the jet grouting rod is lowered into the drilling rod of the multifunctional drilling rig until the lower end of the jet grouting rod reaches the open drill bit at the end; Step 3: Lift the drill rod to the top of the rheological clay layer and rheological silt soil layer The connection between the jet grouting drill rod and the jet grouting drill rig is removed, and the movement of the jet grouting drill rod is blocked by the hard soil layer below the rheological clay layer and the rheological silty soil layer, and the clamp of the multifunctional drilling rig on the drilling drill rod is released, and the drilling drill rod is connected to the multifunctional drilling rig, and the drilling drill rod is lifted to the upper part of the rheological clay layer and the rheological silty soil layer; Step 4: Spraying construction Remove the connection between the multifunctional drilling rig and the drilling rod, and use the clamp of the multifunctional drilling rig to clamp the drilling rod; use the jet drilling rig to connect the jet drilling rod in the drilling rod, start to lift the jet drilling rod and continue to spray the solidifying material, and adjust the spraying pressure to make the jet pile diameter larger than 3 times the diameter of the drilling rod, until it is lifted to the upper part of the rheological clay layer and the rheological silt soil layer and the lower part of the open-end drill bit; Step 5: Drilling into the drill pipe After the rotary grouting construction has completed the reinforcement of the entire rheological clay layer and the rheological silt soil layer, the rotary grouting drill rod is pulled out, the clamping of the multifunctional drilling rig on the drilling drill rod is released, and the drilling drill rod is connected to the multifunctional drilling rig, and after the initial setting of the solidified material, the drilling begins to pass through the reinforced rheological clay layer and the rheological silt soil layer; The verticality measuring equipment is used to measure the verticality of the newly constructed section. When the verticality of the borehole in the newly constructed section exceeds 20% of the design value, the borehole in this section is corrected and revised. The construction measures adopted for the borehole in this section are as follows: Step 1: Verticality Correction During the drilling process, verticality measuring equipment is used to measure the verticality of the borehole, with a measurement frequency of 5-10m. When the verticality of the borehole in the new construction section exceeds the design value by 20%, the drilling rod is lifted up to the last measuring point that does not exceed the design verticality, and the drill is slowly lowered. During the drilling process, the drilling rod is kept suspended until the position where the verticality exceeds the design value meets the design requirements; Step 2: Lower the jet jet drill rod The connection between the multifunctional drilling rig and the drilling rod is removed, and the drilling rod is clamped by the clamp of the multifunctional drilling rig; the jet grouting drilling rig is moved to the drilling hole and the jet grouting rod is lowered into the drilling rod of the multifunctional drilling rig until the lower end of the jet grouting rod reaches the open drill bit at the end; Step 3: Lift the drill rod Remove the connection between the jet grouting drill rod and the jet grouting drill rig, block the movement of the jet grouting drill rod through the hard soil layer under the end open drill bit, release the clamp of the multi-function drill rig on the drilling rod, connect the drilling rod to the multi-function drill rig, and lift the drilling rod to the last measuring point that does not exceed the designed verticality; Step 4: Spraying Remove the connection between the multifunctional drilling rig and the drilling rod, and use the clamp of the multifunctional drilling rig to clamp the drilling rod; use the jet drilling rig to connect the jet drilling rod in the drilling rod, start to lift the jet drilling rod and continue to spray the solidifying material, and adjust the spraying pressure to make the radius of the jet pile larger than 3 times the maximum offset of the drilling hole until it is lifted to the open drill bit at the end; Step 5: Drilling and drilling After the jet grouting construction has completed the reinforcement of the borehole section where the verticality offset exceeds the design value, pull out the jet grouting drill rod, release the clamp of the multi-functional drilling rig on the drilling rod, and connect the drilling rod to the multi-functional drilling rig. After the solidified material has initially solidified, start drilling through the borehole section where the verticality is greater than 20% of the design value.
[0007] Preferably, sleeve valve tube grouting is used to replace rotary jet grouting to achieve the same treatment effect.
[0008] Preferably, the surface of the drilling rod is coated with a drag reducing material.
[0009] Preferably, the solidifying material is one or more of cement and a curing agent, and an accelerating setting agent is added to the solidifying material.
[0010] Preferably, the maximum drilling offset in step 4 is a calculated value based on different depths.
[0011] Preferably, the verticality measuring device measures the verticality of the borehole, and the measured verticality is absolute verticality.
[0012] The beneficial technical effects achieved by adopting the above technical solution are: By combining the rotary jetting process or the grouting process with the drilling process, the technical problems of rheological soil layers and excessive verticality can be solved; by installing drag-reducing materials on the drilling drill rod, the occurrence of drill sticking can be avoided; by adding accelerators, the solidification of the solidified material can be accelerated and the waiting time can be shortened. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1It is a flow chart of a rheological soil layer treatment technology in a high-precision deep hole drilling and correction construction process.
[0014] Figure 2 It is a flow chart of a processing technology for high-precision deep hole drilling and correction construction process when the verticality exceeds the design value by 20%. DETAILED DESCRIPTION Embodiment 1:
[0015] Combined with Figure 1-2 The specific implementation mode of the present invention is further described as follows: A high-precision deep hole drilling and correction construction process, using a multi-functional drilling rig and a rotary jet drilling rig for joint construction. With the increase of construction depth, different treatment measures are taken for soil layers of different properties. The specific construction methods are as follows: When there are rheological clay layers and rheological silt soil layers within the construction depth, the construction measures adopted for these soil layers are: Step 1: Drilling through rheological clay and rheological silt layers Use a multifunctional drilling rig, with drilling rod and open-end drill bit, to extend the construction depth of the open-end drill bit through the rheological clay layer and rheological silt soil layer to ensure the verticality of the borehole; Step 2: Lower the jet jet drill rod The connection between the multifunctional drilling rig and the drilling rod is removed, and the drilling rod is clamped by the clamp of the multifunctional drilling rig; the jet grouting drilling rig is moved to the drilling hole and the jet grouting rod is lowered into the drilling rod of the multifunctional drilling rig until the lower end of the jet grouting rod reaches the open drill bit at the end; Step 3: Lift the drill rod to the top of the rheological clay layer and rheological silt soil layer The connection between the jet grouting drill rod and the jet grouting drill rig is removed, and the movement of the jet grouting drill rod is blocked by the hard soil layer below the rheological clay layer and the rheological silty soil layer, and the clamp of the multifunctional drilling rig on the drilling drill rod is released, and the drilling drill rod is connected to the multifunctional drilling rig, and the drilling drill rod is lifted to the upper part of the rheological clay layer and the rheological silty soil layer; Step 4: Spraying construction Remove the connection between the multifunctional drilling rig and the drilling rod, and use the clamp of the multifunctional drilling rig to clamp the drilling rod; use the jet drilling rig to connect the jet drilling rod in the drilling rod, start to lift the jet drilling rod and continue to spray the solidifying material, and adjust the spraying pressure to make the jet pile diameter larger than 3 times the diameter of the drilling rod, until it is lifted to the upper part of the rheological clay layer and the rheological silt soil layer and the lower part of the open-end drill bit; Step 5: Drilling into the drill pipe After the rotary grouting construction has completed the reinforcement of the entire rheological clay layer and the rheological silt soil layer, the rotary grouting drill rod is pulled out, the clamping of the multifunctional drilling rig on the drilling drill rod is released, and the drilling drill rod is connected to the multifunctional drilling rig, and after the initial setting of the solidified material, the drilling begins to pass through the reinforced rheological clay layer and the rheological silt soil layer; The verticality measuring equipment is used to measure the verticality of the newly constructed section. When the verticality of the borehole in the newly constructed section exceeds 20% of the design value, the borehole in this section is corrected and revised. The construction measures adopted for the borehole in this section are as follows: Step 1: Verticality Correction During the drilling process, verticality measuring equipment is used to measure the verticality of the borehole, with a measurement frequency of 5-10m. When the verticality of the borehole in the new construction section exceeds the design value by 20%, the drilling rod is lifted up to the last measuring point that does not exceed the design verticality, and the drill is slowly lowered. During the drilling process, the drilling rod is kept suspended until the position where the verticality exceeds the design value meets the design requirements; Step 2: Lower the jet jet drill rod The connection between the multifunctional drilling rig and the drilling rod is removed, and the drilling rod is clamped by the clamp of the multifunctional drilling rig; the jet grouting drilling rig is moved to the drilling hole and the jet grouting rod is lowered into the drilling rod of the multifunctional drilling rig until the lower end of the jet grouting rod reaches the open drill bit at the end; Step 3: Lift the drill rod Remove the connection between the jet grouting drill rod and the jet grouting drill rig, block the movement of the jet grouting drill rod through the hard soil layer under the end open drill bit, release the clamp of the multi-function drill rig on the drilling rod, connect the drilling rod to the multi-function drill rig, and lift the drilling rod to the last measuring point that does not exceed the designed verticality; Step 4: Spraying Remove the connection between the multifunctional drilling rig and the drilling rod, and use the clamp of the multifunctional drilling rig to clamp the drilling rod; use the jet drilling rig to connect the jet drilling rod in the drilling rod, start to lift the jet drilling rod and continue to spray the solidifying material, and adjust the spraying pressure to make the radius of the jet pile larger than 3 times the maximum offset of the drilling hole until it is lifted to the open drill bit at the end; Step 5: Drilling and drilling After the jet grouting construction has completed the reinforcement of the borehole section where the verticality offset exceeds the design value, pull out the jet grouting drill rod, release the clamp of the multi-functional drilling rig on the drilling rod, and connect the drilling rod to the multi-functional drilling rig. After the solidified material has initially solidified, start drilling through the borehole section where the verticality is greater than 20% of the design value.
[0016] Preferably, sleeve valve tube grouting is used to replace rotary jet grouting to achieve the same treatment effect.
[0017] Preferably, the surface of the drilling rod is coated with a drag reducing material.
[0018] Preferably, the solidifying material is one or more of cement and a curing agent, and an accelerating setting agent is added to the solidifying material.
[0019] Preferably, the maximum drilling offset in step 4 is a calculated value based on different depths.
[0020] Preferably, the verticality measuring device measures the verticality of the borehole, and the measured verticality is absolute verticality. Embodiment 2:
[0021] Combined with Figure 1-2 The specific implementation mode of the present invention is further described as follows: A high-precision deep hole drilling and correction construction process, using a multi-functional drilling rig and a rotary jet drilling rig for joint construction. With the increase of construction depth, different treatment measures are taken for soil layers of different properties. The specific construction methods are as follows: When there are rheological clay layers and rheological silt soil layers within the construction depth, the construction measures adopted for this soil layer are: the fluidity of this soil layer is relatively large. When the drill rod passes through and a hole is drilled at the lower part of the construction, when there is a short construction interval, the rheological soil layer will lock the drill rod, making it difficult to lower and lift it up. In severe cases, the drill may be buried. Therefore, in order to avoid this situation, the rheological soil layer is reinforced. After reinforcement, the drill will not be stuck during construction.
[0022] Step 1: Drilling through rheological clay and rheological silt layers A multifunctional drilling rig is used in conjunction with a drilling rod and an open-end drill bit. The construction depth of the open-end drill bit is extended to penetrate the rheological clay layer and the rheological silt soil layer to ensure the verticality of the borehole. The open-end drill bit is used for subsequent rotary jet construction or grouting construction. The use of this type of drill bit in conjunction with the positive circulation process has a better drilling effect.
[0023] Step 2: Lower the jet jet drill rod Remove the connection between the multifunctional drilling rig and the drilling rod, and use the clamp of the multifunctional drilling rig to clamp the drilling rod; move the rotary jet drilling rig to the drilling hole and lower the rotary jet drill rod into the drilling rod of the multifunctional drilling rig until the lower end of the rotary jet drill rod reaches the open drill bit at the end; the rotary jet drill rod is inside the drilling rod to facilitate the lowering construction of the rotary jet drill rod and to prevent the rheological soil layer from locking the rotary jet drill rod.
[0024] Step 3: Lift the drill rod to the top of the rheological clay layer and rheological silt soil layer The connection between the jet grouting drill rod and the jet grouting drill rig is removed, and the movement of the jet grouting drill rod is blocked by the hard soil layer below the rheological clay layer and the rheological silty soil layer, and the clamp of the multifunctional drilling rig on the drilling drill rod is released, and the drilling drill rod is connected to the multifunctional drilling rig, and the drilling drill rod is lifted to the upper part of the rheological clay layer and the rheological silty soil layer; Step 4: Spraying construction Remove the connection between the multifunctional drilling rig and the drilling rod, and use the clamp of the multifunctional drilling rig to clamp the drilling rod; use the rotary jet drilling rig to connect with the rotary jet drill rod in the drilling rod, start to lift the rotary jet drill rod and continue to spray the solidifying material, and adjust the spraying pressure to make the diameter of the rotary jet pile larger than 3 times the diameter of the drilling rod, until it is lifted to the upper part of the rheological clay layer and the rheological silt soil layer and the lower part of the open-end drill bit; setting 3 times is to minimize construction and meet the stability requirements, so that the operation saves more materials.
[0025] Step 5: Drilling into the drill pipe After the rotary grouting construction has completed the reinforcement of the entire rheological clay layer and the rheological silt soil layer, the rotary grouting drill rod is pulled out, the clamping of the multifunctional drilling rig on the drilling drill rod is released, and the drilling drill rod is connected to the multifunctional drilling rig, and after the initial setting of the solidified material, the drilling begins to pass through the reinforced rheological clay layer and the rheological silt soil layer; Verticality measuring equipment is used to measure the verticality of the new construction section. When the verticality of the borehole in the new construction section exceeds 20% of the design value, the borehole in this section is corrected and modified. The construction measures adopted for this section of drilling are: when the offset is too large during the drilling process, it is necessary to lift it to the non-offset position and then re-drill and correct the offset. In this way, the existence of the first drilling hole makes subsequent correction and modification difficult. The drilling rod is more likely to deviate from the existing first drilling hole during the correction process, resulting in unsuccessful correction. Therefore, it is necessary to grout the borehole below the offset position to form a uniform reinforcement body, so that it is not easy to deviate when drilling again.
[0026] Step 1: Verticality Correction During the drilling process, verticality measuring equipment is used to measure the verticality of the borehole with a measurement frequency of 5-10m. When the verticality of the borehole in the new construction section exceeds the design value by 20%, the drill rod is lifted to the last measuring point that does not exceed the design verticality, and the drill is slowly lowered. During the drilling process, the drill rod is kept suspended until the original position that exceeds the design value verticality meets the design requirements. Verticality measurement is generally performed at a measuring point of 5m or 10m. When each measuring point within the entire drilling construction depth meets the design requirements, drilling can continue. When the verticality measured while drilling continues exceeds the designer's value by 20%, it is necessary to correct the deviation from the last 5m or 10m position.
[0027] Step 2: Lower the jet jet drill rod The connection between the multifunctional drilling rig and the drilling rod is removed, and the drilling rod is clamped by the clamp of the multifunctional drilling rig; the jet grouting drilling rig is moved to the drilling hole and the jet grouting rod is lowered into the drilling rod of the multifunctional drilling rig until the lower end of the jet grouting rod reaches the open drill bit at the end; Step 3: Lift the drill rod Remove the connection between the jet grouting drill rod and the jet grouting drill rig, block the movement of the jet grouting drill rod through the hard soil layer under the end open drill bit, release the clamp of the multi-function drill rig on the drilling rod, connect the drilling rod to the multi-function drill rig, and lift the drilling rod to the last measuring point that does not exceed the designed verticality; Step 4: Spraying Remove the connection between the multifunctional drilling rig and the drilling rod, and use the clamp of the multifunctional drilling rig to clamp the drilling rod; use the rotary jet drilling rig to connect with the rotary jet drill rod in the drilling rod, start to lift the rotary jet drill rod and continue to spray the solidifying material, and adjust the spraying pressure to make the radius of the rotary jet pile larger than 3 times the maximum offset of the borehole until it is lifted to the open drill bit at the end; setting 3 times is to minimize construction and meet the stability requirements, so that the operation saves more materials.
[0028] Step 5: Drilling and drilling After the jet grouting construction has completed the reinforcement of the borehole section where the verticality offset exceeds the design value, pull out the jet grouting drill rod, release the clamp of the multi-functional drilling rig on the drilling rod, and connect the drilling rod to the multi-functional drilling rig. After the solidified material has initially solidified, start drilling through the borehole section where the verticality is greater than 20% of the design value.
[0029] Preferably, sleeve valve tube grouting is used to replace rotary jet grouting to achieve the same treatment effect. If sleeve valve tube grouting is used, grouting holes need to be reserved on the drill pipe. The other processes are similar to rotary jet grouting, except that the solidified material is changed from injection to grouting, all for the purpose of reinforcing the surrounding soil or holes.
[0030] Preferably, the surface of the drilling rod is coated with a drag reducing material. The drag reducing material includes asphalt, waterproofing membrane, butter, etc. Preferably, the solidifying material is one or more of cement and a curing agent, and an accelerating setting agent is added to the solidifying material to accelerate the setting of the solidifying material and shorten the waiting time.
[0031] Preferably, the maximum offset of the drilling in step 4 is calculated according to different depths. For example, if the verticality design value is 1 / 200, then the maximum offset at a depth of 10m is 5cm, and 20% of the design value is 1cm. Then when the deviation exceeds 6cm, correction is required, and the diameter of the jet grouting pile is greater than 36cm.
[0032] Preferably, the verticality measuring device measures the verticality of the borehole, and the measured verticality is absolute verticality.
[0033] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "center", "up", "down", "front", "back", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0034] In the description of the embodiments of the present invention, the term "and / or" refers to and covers any and all possible combinations of one or more of the associated listed items. The term "and / or" is a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.
[0035] In the description of the embodiments of the present invention, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.
[0036] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.
[0037] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention also fall within the protection scope of the present invention.
Claims
1. A high-precision deep hole drilling and correction construction process, characterized in that: The multifunctional drilling rig and the rotary jet drilling rig are used for joint construction. With the increase of construction depth, different treatment measures are taken for soil layers of different properties. The specific construction methods are as follows: When there are rheological clay layers and rheological silt soil layers within the construction depth, the construction measures adopted for these soil layers are: Step 1: Drilling through rheological clay and rheological silt layers Use a multifunctional drilling rig, with drilling rods and open-end drill bits, to extend the construction depth of the open-end drill bits through rheological clay layers and rheological silt soil layers to ensure the verticality of the borehole; Step 2: Lower the jet jet drill rod The connection between the multifunctional drilling rig and the drilling rod is removed, and the drilling rod is clamped by the clamp of the multifunctional drilling rig; the jet grouting drilling rig is moved to the drilling hole and the jet grouting rod is lowered into the drilling rod of the multifunctional drilling rig until the lower end of the jet grouting rod reaches the open drill bit at the end; Step 3: Lift the drill rod to the top of the rheological clay layer and rheological silt soil layer The connection between the jet grouting drill rod and the jet grouting drill rig is removed, and the movement of the jet grouting drill rod is blocked by the hard soil layer below the rheological clay layer and the rheological silty soil layer, and the clamp of the multifunctional drilling rig on the drilling drill rod is released, and the drilling drill rod is connected to the multifunctional drilling rig, and the drilling drill rod is lifted to the upper part of the rheological clay layer and the rheological silty soil layer; Step 4: Spraying construction Remove the connection between the multifunctional drilling rig and the drilling rod, and use the clamp of the multifunctional drilling rig to clamp the drilling rod; use the jet drilling rig to connect the jet drilling rod in the drilling rod, start to lift the jet drilling rod and continue to spray the solidifying material, and adjust the spraying pressure to make the jet pile diameter larger than 3 times the diameter of the drilling rod, until it is lifted to the upper part of the rheological clay layer and the rheological silt soil layer and the lower part of the open-end drill bit; Step 5: Drilling into the drill pipe After the rotary grouting construction has completed the reinforcement of the entire rheological clay layer and the rheological silt soil layer, the rotary grouting drill rod is pulled out, the clamping of the multifunctional drilling rig on the drilling drill rod is released, and the drilling drill rod is connected to the multifunctional drilling rig, and after the initial setting of the solidified material, the drilling begins to pass through the reinforced rheological clay layer and the rheological silt soil layer; The verticality measuring equipment is used to measure the verticality of the newly constructed section. When the verticality of the borehole in the newly constructed section exceeds 20% of the design value, the borehole in this section is corrected and revised. The construction measures adopted for the borehole in this section are as follows: Step 1: Verticality Correction During the drilling process, verticality measuring equipment is used to measure the verticality of the borehole, with a measurement frequency of 5-10m. When the verticality of the borehole in the new construction section exceeds the design value by 20%, the drilling rod is lifted up to the last measuring point that does not exceed the design verticality, and the drill is slowly lowered. During the drilling process, the drilling rod is kept suspended until the position where the verticality exceeds the design value meets the design requirements; Step 2: Lower the jet jet drill rod The connection between the multifunctional drilling rig and the drilling rod is removed, and the drilling rod is clamped by the clamp of the multifunctional drilling rig; the jet grouting drilling rig is moved to the drilling hole and the jet grouting rod is lowered into the drilling rod of the multifunctional drilling rig until the lower end of the jet grouting rod reaches the open drill bit at the end; Step 3: Lift the drill pipe Remove the connection between the jet grouting drill rod and the jet grouting drill rig, block the movement of the jet grouting drill rod through the hard soil layer under the end open drill bit, release the clamp of the multi-function drill rig on the drilling rod, connect the drilling rod to the multi-function drill rig, and lift the drilling rod to the last measuring point that does not exceed the designed verticality; Step 4: Spraying Remove the connection between the multifunctional drilling rig and the drilling rod, and use the clamp of the multifunctional drilling rig to clamp the drilling rod; use the jet drilling rig to connect the jet drilling rod in the drilling rod, start to lift the jet drilling rod and continue to spray the solidifying material, and adjust the spraying pressure to make the radius of the jet pile larger than 3 times the maximum offset of the drilling hole until it is lifted to the open drill bit at the end; Step 5: Drilling and drilling After the jet grouting construction has completed the reinforcement of the borehole section where the verticality offset exceeds the design value, pull out the jet grouting drill rod, release the clamp of the multi-functional drilling rig on the drilling rod, and connect the drilling rod to the multi-functional drilling rig. After the solidified material has initially solidified, start drilling through the borehole section where the verticality is greater than 20% of the design value.
2. A high-precision deep hole drilling and correction construction process according to claim 1, characterized in that: Sleeve valve pipe grouting is used to replace rotary jet grouting to achieve the same treatment effect.
3. A high-precision deep hole drilling and correction construction process according to claim 1, characterized in that: The surface of the drilling rod is coated with drag reducing material.
4. A high-precision deep hole drilling and correction construction process according to claim 1, characterized in that: The solidifying material is one or more of cement and a curing agent, and an accelerating setting agent is added to the solidifying material.
5. A high-precision deep hole drilling and correction construction process according to claim 1, characterized in that: The maximum drilling offset in step 4 is calculated based on different depths.
6. A high-precision deep hole drilling and correction construction process according to claim 1, characterized in that: The verticality measuring equipment measures the verticality of the borehole, and the measured verticality is the absolute verticality.