Full casing drilling rig inclined hole clearing method

Abstract

This invention relates to the field of building construction technology, specifically to a method for clearing obstacles in inclined holes using a full-casing drilling rig. The invention includes the following steps: 1) Construction preparation and site leveling; 2) Measurement and layout of the clearing hole; 3) Guide wall construction; 4) Inserting the outer casing into the first hole; 5) Soil removal and cleaning; 6) Installing tools and a rock drilling rig, using this equipment to drill through the pile (wall) obstacle; 7) Using the full-casing drilling rig to drive the inner casing to drill through the obstacle; 8) Pulling out the inner casing and removing the pile (wall) obstacle, backfilling the hole; 9) Pulling out the outer casing; 10) Moving the drilling rig to the next hole and repeating steps 5)-9) until all obstacles are cleared. This invention is highly operable, has high construction efficiency, and is relatively fast, thus shortening the construction period.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a method for clearing obstructions in inclined holes using a full casing drilling rig. Background Technology

[0002] With the rapid development of my country's economy and society and the significant enhancement of its comprehensive national strength, the living standards of urban and rural residents have improved significantly, and urban infrastructure has undergone a qualitative leap. When a new subway line passes through an existing subway station, to allow the tunnel boring machine (TBM) to smoothly pass through the existing subway station's substructure of piles (walls), it is necessary to remove the retaining piles (walls) within the diameter of the tunnel. Such projects are often quite deep, frequently exceeding 20 meters, with large clearance holes. Furthermore, due to the deep geological conditions and complex geological conditions, including sandy silt and silty clay, rich in groundwater and confined water, and the obstacles being adjacent to the existing subway main structure, conventional clearance methods can easily damage the existing subway main structure. Additionally, manual drilling (well) work is not permitted during clearance unless safety can be guaranteed. If the approach of constructing the foundation pit first and then clearing the obstacles is adopted, the construction period is long and the cost is high. Therefore, how to carry out clearance efficiently and accurately has become a technical challenge for such projects. Summary of the Invention

[0003] The purpose of this invention is to provide a construction method for efficient and precise underground obstacle removal in existing subway systems. This construction method is designed to be safe, have a short construction period, and achieve high clearance accuracy.

[0004] To achieve the above objectives, the technical solution adopted by this invention is: a method for clearing obstructions in inclined holes using a full casing drilling rig, specifically including the following steps:

[0005] 1) Construction preparation, site leveling;

[0006] 2) Measurement and layout of the obstacle clearing holes;

[0007] 3) Guide wall construction;

[0008] 4) Place the full-rotation drilling rig on the guide wall surface and align it with the first hole on the guide wall. Press the outer sleeve into the first hole according to the inclination requirements calculated by measurement.

[0009] 5) Use a rotary drilling rig to remove soil from inside the casing until the pile (wall) obstacle is reached;

[0010] 6) Install the tooling and rock drilling machine inside the cleaned outer casing. Use the equipment to drill the pile (wall) obstacle to create a certain groove. Then remove the tooling and rock drilling machine.

[0011] 7) Hoist the inner casing with the cutter head tube into the outer casing, lower it to the pile (wall) obstacle, and use the full casing drilling rig to drive the inner casing to drill out the obstacle;

[0012] 8) Pull out the inner casing and remove the pile (wall) obstacle, then backfill the hole;

[0013] 9) Pull out the outer tube;

[0014] 10) Move the drill to the next hole and repeat steps 5)-9) until all obstacles are cleared.

[0015] Preferably, the construction preparation in step 1) includes the preparation and placement of construction equipment, which includes full casing drilling rig, crane, outer casing, inner casing, rotary drilling rig, rock drilling rig, excavator, grouting equipment and tooling.

[0016] Preferably, the guide wall in step 3) is a steel structure or a reinforced concrete structure. The guide wall includes an inclined guide wall (2) fixedly connected to the top of the ground (1). A sleeve guide bracket (3) is provided on one side of the bottom of the inclined guide wall (2). Multiple pile holes (4) are opened on the surface of the inclined guide wall (2).

[0017] Preferably, the groove drilled by the rock drilling machine in step 6) includes a central groove and a surrounding groove.

[0018] Preferably, in step 7), the inner sleeve is secured to the pile (wall) obstacle with an iron pin.

[0019] The beneficial technical effects of this invention are:

[0020] ①When clearing obstacles, the construction method of this invention only clears the obstacles in the area that affects the tunnel boring machine's excavation. It does not require removing obstacles such as piles (walls) from the ground down, so it will not damage the main structure of the existing subway station.

[0021] ② During construction, all operations are completed on the ground, with a high degree of mechanization, eliminating the need for manual drilling (welling) and ensuring the safety of workers.

[0022] ③ The construction of this invention uses steel casing for wall protection, which can adapt to all strata and is not affected by groundwater.

[0023] ④ This obstacle removal method uses double-tube construction. When replacing the inner tube cutter head (tooth), the outer tube acts as a rigid protective wall to avoid adverse effects such as hole collapse. With the outer tube as a protective wall and special tooling installed between the inner and outer tubes, the friction between the inner tube and the outer tube during rotation can be greatly reduced, improving the construction efficiency of the inner tube and thus improving the obstacle removal efficiency.

[0024] ⑤ This obstacle removal method, combined with the construction of a small rock drilling rig, involves pre-drilling a groove on the upper part of the pile (wall) removal area to prevent slippage and displacement when the inclined inner casing cuts off the pile (wall).

[0025] ⑥ This obstacle removal method is highly operable, has high construction efficiency, and is relatively fast, which can shorten the construction period. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart illustrating the construction process of this invention.

[0028] Figure 2 This is a schematic diagram of the guide wall structure during the construction of this invention;

[0029] Figure 3 This is a schematic diagram of the rock drilling machine construction and shaping effect in step 6) of the present invention;

[0030] Figure 4 This is a construction diagram for step 7) of the present invention.

[0031] The components are: 1. Ground; 2. Inclined guide wall; 3. Sleeve guide support; 4. Pile hole; 5. Groove; 6. Outer sleeve; 7. Tooling. Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0033] See Figure 1 — Figure 3 The method for clearing obstructions in inclined holes using a full casing drilling rig includes the following steps:

[0034] 1) Construction preparation, site leveling, including the preparation and placement of construction equipment, including full casing drilling rig, crane, outer casing, inner casing, rotary drilling rig, rock drilling rig, excavator, grouting equipment and tooling;

[0035] 2) Measurement and layout of the obstacle clearing holes;

[0036] 3) Construction of guide wall, wherein the guide wall is a steel structure or a reinforced concrete structure, the guide wall includes an inclined guide wall 2 fixedly connected to the top of the ground 1, a sleeve guide bracket 3 is provided on one side of the bottom of the inclined guide wall 2, and multiple pile holes 4 are opened on the surface of the inclined guide wall 2;

[0037] 4) Place the full-rotation drilling rig on the guide wall surface and align it with the first hole on the guide wall. Press the outer sleeve into the first hole according to the inclination requirements calculated by measurement.

[0038] 5) Use a rotary drilling rig to remove soil from inside the casing until the pile (wall) obstacle is reached;

[0039] 6) Install the tooling and rock drilling rig inside the cleaned outer casing. Use this equipment to drill the pile (wall) obstacle, creating a specific groove. Then remove the tooling and rock drilling rig. The groove created by the rock drilling rig includes a center groove and a groove on the upper part of the inner ring of the surrounding tooling. See details below. Figure 3 ;

[0040] 7) Hoist the inner casing with the cutter head tube into the outer casing and lower it to the pile (wall) obstacle. Use a full casing drilling rig to drive the inner casing to drill the obstacle. The inner casing and the pile (wall) obstacle are fixed with iron pins, preferably an impact hammer.

[0041] 8) Pull out the inner casing and remove the pile (wall) obstacle, then backfill the hole;

[0042] 9) Pull out the outer tube;

[0043] 10) Move the drill to the next hole and repeat steps 5)-9) until all obstacles are cleared.

[0044] The tooling used is the device described in patent number 2021231966894, "A Multi-tube Guiding Device for Drill Bits of Rock Drilling Rigs".

[0045] The guide wall in the embodiment is referenced. Figure 2The guide wall includes an inclined guide wall 2 fixedly connected to the top of the ground 1. A casing guide bracket 3 is provided on one side of the bottom of the inclined guide wall 2. The surface of the inclined guide wall 2 and the inclined surface of the casing guide bracket 3 are perpendicular to each other. The surface of the casing guide bracket 3 is arc-shaped and adapted to the casing, facilitating the sliding of the casing into the pile hole in the inclined guide wall 2. The inclination angle and the position of the inclined guide wall 2 need to be determined according to the drilling position on the pile (wall) obstacle to ensure that when the full-rotation drilling rig is installed on the casing guide bracket 3, the drilled pile hole 4 can reach the designated pile (wall) obstacle. The inclined guide wall 2 and the casing guide bracket 3 are steel structures or reinforced concrete structures. Steel structures or reinforced concrete structures have good... To ensure the stability of the drilling operation, the inclined guide wall 2 has multiple pile holes 4 on its surface. The multiple pile holes 4 are perpendicular to the inclined surface of the inclined guide wall 2. The output drilling direction of the rotary drilling machine is determined by the sleeve guide bracket 3 with the vertical structure, so that the drilled pile holes 4 can be drilled in a direction perpendicular to the inclined guide wall 2. The pile holes 4 are intersecting circles or tangent circles. When drilling begins, the number of pile holes 4 needs to be determined according to the size of the hole on the pile (wall) obstacle, so that the total diameter of the multiple pile holes 4 is equal to the size of the hole on the pile (wall) obstacle. The intersecting circle or tangent circle structure can effectively adjust the total diameter of the multiple pile holes 4. The multiple pile holes 4 are formed in one step.

[0046] This invention's construction method clears obstacles only at specific points within the area affecting the tunnel boring machine's excavation, eliminating the need to remove piles (walls) and other obstacles from the ground down, thus preventing damage to existing subway station structures. During construction, all operations are completed on the ground, resulting in a high degree of mechanization and eliminating the need for manual drilling, ensuring worker safety. The invention utilizes steel casing for wall protection, adaptable to all geological formations and unaffected by groundwater. The double-casing construction method, with the outer casing acting as a rigid protective wall when replacing the inner casing cutter head (teeth), prevents borehole collapse and other adverse effects. The outer casing provides protection, and special tooling between the inner and outer casings significantly reduces friction between the inner and outer casings during rotation, improving inner casing construction efficiency and consequently, clearing efficiency. This method, combined with a small rock drilling rig, pre-drills grooves above the pile (wall) removal area to prevent slippage and displacement of the tilted inner casing during pile (wall) cutting. This clearing method is highly operable, efficient, and relatively fast, shortening the construction period.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for clearing obstructions in inclined holes using a full-casing drilling rig, characterized by: Specifically, the following steps are included: 1) Construction preparation and site leveling; 2) Measurement and layout of the obstacle removal holes; 3) Construction of the guide wall; 4) Place the full casing drilling rig on the surface of the guide wall and align it with the first pile hole on the guide wall. Press the outer casing into the first pile hole according to the required inclination calculated by measurement; 5) Use a rotary drilling rig to remove soil from the outer casing until the pile / wall obstacle is reached; 6) Install the tooling and rock drilling rig inside the cleaned outer casing. Use the rock drilling rig to drill the pile / wall obstacle to create a certain groove. Then remove the tooling and rock drilling rig; 7) Hoist the inner casing with the cutter head tube into the outer casing and lower it to the pile / wall obstacle. Use the full casing drilling rig to drive the inner casing to drill the obstacle; 8) Pull out the inner casing and remove the pile / wall obstacle. Backfill the hole; 9) Pull out the outer casing; 10) Move the full casing drilling rig to the next pile hole and repeat steps 5)-9) until all obstacles are cleared. The aforementioned construction method is used for tunnel boring machines to pass through the substructure of existing subway stations, requiring the removal of retaining piles / walls within the diameter of the tunnel. In step 3), the guide wall is a steel structure or a reinforced concrete structure. The guide wall includes an inclined guide wall (2) fixedly connected to the top of the ground (1). A sleeve guide bracket (3) is provided on one side of the bottom of the inclined guide wall (2). The surface of the inclined guide wall (2) and the inclined surface of the sleeve guide bracket (3) are perpendicular to each other. The surface of the sleeve guide bracket (3) is an arc-shaped structure that is compatible with the sleeve, making it convenient for the sleeve to slide into the pile hole in the inclined guide wall (2). Multiple pile holes (4) are opened on the surface of the inclined guide wall (2). The multiple pile holes (4) are perpendicular to the inclined surface of the inclined guide wall (2). The output drilling direction of the full casing drilling machine is determined by the casing guide bracket (3) with the vertical structure, so that the drilled pile holes (4) can be drilled in a direction perpendicular to the inclined guide wall (2). The pile holes (4) are intersecting circles or tangent circles. Multiple pile holes (4) are formed in one step. In step 6), the groove drilled by the rock drilling machine includes a central groove and a surrounding groove.

2. The method for clearing obstructions in inclined holes using a full-casing drilling rig according to claim 1, characterized in that: The construction preparation in step 1) includes the preparation and placement of construction equipment, which includes the full casing drilling rig, crane, outer casing, inner casing, rotary drilling rig, rock drilling rig, excavator, grouting equipment and tooling.

3. The method for clearing obstructions in inclined holes using a full-casing drilling rig according to claim 1, characterized in that: In step 7), the inner sleeve is secured to the pile / wall obstacle with an iron pin.

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