Broken rock mass bottom plate hole forming method
By spraying grouting materials on the surface of the crushed rock base plate and stirring with the drill rod, the problem of hole wall collapse and slag return during hole formation in well tunnel projects is solved, stable support of the orifices and simplification of the process is achieved, and construction costs are reduced.
Patent Information
- Application Number
- CN202510565057.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2025-06-10
AI Technical Summary
During the construction of well and tunnel projects, when the bottom plate of broken rock mass becomes holes, the hole wall often falls and collapses, which affects the drilling operation, and the slag return is not smooth, the process is cumbersome, and the cost is high.
A method of forming holes into a broken rock bottom plate is adopted, including preparing grouting materials, spraying them on the surface of the broken rock bottom plate, pouring grouting materials into the holes during drilling, and stirring up and down with a drill rod to make the slurry cement with the rock body, and pulling out the drill rod after the slurry is hardened to form a smooth hole in the inner wall.
The bottom plate of the rock mass is reinforced through the spraying process to prevent the rock mass from breaking and slag loss. The slag return process can be successfully completed after the drill rod is pulled out. The hardened hole supports the orifice, which does not require recycling, simplifies the process and reduces costs, and solves the problems of easy collapse of the hole wall, unsmooth slag return, and cumbersome process.
Smart Images
Figure CN120120007A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of mine roadway engineering applications, and particularly relates to a method for forming holes in the floor of fractured rock masses. Background Art
[0002] The most basic process of roadway engineering construction is to break the rock from the rock mass according to the design requirements and construction conditions to form the required spaces such as shafts and roadways. Then, certain support materials and structures are used to necessary maintain these underground spaces to prevent the surrounding rock from continuing to break and collapse. During the construction process, it is easy for fractured rock and soil to cover the roadway floor. The thickness of the fractured rock and soil layer is 0.4m - 0.5m. During the process of drilling and rock drilling in the floor, the phenomenon of block falling and hole collapse frequently occurs in the hole wall, affecting the progress of the drilling operation.
[0003] Currently, the main methods for forming holes in underground fractured rock masses are as follows: First, large-diameter drill pipes are used for rock drilling and hole formation, and hole cleaning operations are carried out. This method has a cumbersome operation process and the drilled holes cannot be continuously stable after hole formation; Second, slow hole formation with a small penetration rate is used. This method has situations such as the hole wall collapsing and falling after the drill pipe is withdrawn; Third, a casing is lowered after drilling and tunneling, and the casing is recovered after the operation is completed. This method has a cumbersome process, and the later recovery work results in a high cost. Summary of the Invention
[0004] The present invention provides a method for forming holes in the floor of fractured rock masses, aiming to solve the technical problems of hole wall collapse and unsmooth slag return during drilling in the above background art.
[0005] A method for forming holes in the floor of fractured rock masses, the method includes: Step 1, prepare grouting materials; Step 2, spray the grouting materials on the surface of the floor of the fractured rock mass; Step 3, when the surface of the floor of the fractured rock mass is dry, use a drill pipe to drill a hole in the surface of the fractured rock mass, while pouring the grouting materials into the hole, and stir up and down with the drill pipe to assist the slurry to enter the fractured rock mass and cement with the fractured rock mass; Step 4, when the grouting materials start to harden, withdraw the drill pipe, and wait for the grouting materials to completely harden to form a hole with a smooth inner wall.
[0006] Further, the devices used for preparing and spraying the grouting materials include: a mixing barrel, which is provided with a feed inlet, a driving device, and a mixing kit inside. The driving device is connected to the mixing kit. The mixing barrel is connected to a discharge pipe through a high-pressure grouting pump, and the discharge pipe is externally connected to a spray gun.
[0007] Further, a pressure gauge and a pressure relief valve are provided on the discharge pipe.
[0008] The beneficial effects of the present invention are as follows: In the present invention, the spraying process on the surface of the bottom plate of the fractured rock mass can play a role in strengthening the subsequent drilling, preventing the rock mass from breaking and shedding slag; after the drill rod is stirred and withdrawn, the slag can be withdrawn from the inside of the drill rod, and the slag return process can be successfully completed; the fractured rock mass at the orifice of the hole formed after hardening can support the hole, and there is no need for recycling, which simplifies the process and cost. Generally, the present invention solves the problems of easy collapse of the hole wall, unsmooth slag return, and complicated processes during the hole formation of the fractured rock mass, provides an integrated operation process for construction, and achieves the purpose of low-cost and high-efficiency support for the hole orifice. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 is the structural diagram of the device used in the present invention; Among them, 7 is the feed inlet; 8 is the driving device; 9 is the high-pressure grouting pump; 10 is the pressure gauge and pressure relief valve; 11 is the discharge pipe; 12 is the mixing kit; 13 is the mixing barrel. SPECIFIC EMBODIMENTS
[0010] The following further describes in detail the specific embodiments of the invention with reference to the accompanying drawings.
[0011] As Figure 1 shown, a method for forming a hole in the bottom plate of a fractured rock mass adopts an integrated process to form a hole with a smooth inner wall, and specifically includes the following steps: Step 1: Prepare the grouting material; Step 2: Spray the grouting material on the surface of the bottom plate of the fractured rock mass; Step 3: When the surface of the bottom plate of the fractured rock mass is dry, use a drill rod to drill a hole in the surface of the fractured rock mass, pour the grouting material into the hole at the same time, and stir the drill rod up and down to assist the slurry to enter the fractured rock mass and bond with the fractured rock mass; Step 4: When the grouting material starts to harden, withdraw the drill rod, and wait for the grouting material to harden to form a hole with a smooth inner wall.
[0012] During the process of forming a hole in the bottom plate of the fractured rock mass, the grouting material enters the mixing barrel 13 from the feed inlet 7, is connected to the mixing kit 12 through the driving device 8, and is stirred at high speed by the air pressure to provide power. After the stirring is completed, the grouting material is extracted through the high-pressure grouting pump 9 connected to the discharge pipe 11. The discharge pipe 11 is externally connected to a spray gun, and a pressure gauge and pressure relief valve 10 are provided on the discharge pipe 11 for pressure monitoring and release to ensure that the grouting material is smoothly sprayed on the surface of the bottom plate of the fractured rock mass.
[0013] When drilling a hole, pour the grouting material at the same time, and use the drill rod to stir up and down. When the grouting material starts to harden slightly, withdraw the drill rod and wash it in time with high-pressure water to avoid being blocked by concrete. After the grouting material in the hole is completely hardened, a hole that can support the hole wall is formed.
Claims
1. A method for drilling holes in a broken rock mass floor, characterized in that: include: Step 1, preparing grouting materials; Step 2, spraying the grouting material on the surface of the broken rock mass bottom plate; Step 3: When the surface of the bottom plate of the broken rock mass is dry, use a drill rod to drill holes on the surface of the broken rock mass, pour grouting materials into the holes, and stir up and down with the drill rod to assist the slurry to enter the broken rock mass and bond with the broken rock mass; Step 4: When the grouting material begins to harden, pull out the drill rod and wait until the grouting material hardens completely to form a hole with a smooth inner wall.
2. A method for drilling holes in a broken rock mass bottom plate according to claim 1, characterized in that: The device used for preparing and spraying grouting material comprises a mixing barrel (13), the mixing barrel (13) is provided with a feed port (7) and a driving device (8), a stirring kit (12) is provided inside the mixing barrel (13), the driving device (8) is connected to the stirring kit (12), the mixing barrel (13) is connected to a discharge pipe (11) via a high-pressure grouting pump (9), and the discharge port pipe (11) is externally connected to a spray gun.
3. A method for drilling holes in a broken rock mass bottom plate according to claim 2, characterized in that: The discharge pipe (11) is provided with a pressure gauge and a pressure relief valve (10).