Square hole forming process for rock stratum

Abstract

The square hole forming process comprises the following steps that (1) firstly, a rotary drilling rig is selected for drilling, and a large hole is drilled in the rock stratum through the rotary drilling rig in the first drilling process; (2) a small down-the-hole drill is selected to drill a plurality of small holes, and the small down-the-hole drill drills a plurality of small holes around the large hole; (3) a hydraulic splitting rod is selected to conduct vibration splitting on the rock, and the hydraulic splitting rod is used for conducting vibration splitting on the rock between the large hole and the small holes; and (4) irregular parts are milled off through a square drill, and then the square hole in the rock stratum can be completed. According to the method, firstly, the rotary drilling rig is adopted to drill the middle large hole, the problem that the rotary drilling rig drills a plurality of large holes and deviates can be avoided, then the down-the-hole drill drills the peripheral small holes without directly facing the free face, and it is guaranteed that the phenomenon of hole deviation does not occur. And then rock between the small holes and the large holes is cracked through vibration of the hydraulic splitting rod, punching of the square holes in the rock stratum is completed, cost is reduced, and the hole forming quality and efficiency of the square holes in the rock stratum are improved.

Description

Technical Field

[0001] The invention relates to the technical field of rock formation drilling technology, and in particular to a square hole forming technology for rock formations. Background Art

[0002] There are two main square hole forming processes for rock formations in the prior art:

[0003] Process 1: Drilling holes with a round drill. Use a rotary drilling rig to drill holes as shown in the figure below (such as Figure 2 As shown), use a square drill to mill out the areas that the drill cannot reach.

[0004] Process 2: Drilling holes with a round drill. Use a rotary drill to drill holes as shown in the figure below (such as Figure 3 As shown), use a square drill to mill out the areas that the drill cannot reach.

[0005] No matter which of the above methods is used to drill holes in the rock formation, it is easy to drill the first time, but there will be bites between the holes in the following drills because there is an empty surface and the holes are biased. The problem of not being able to drill straight bite holes has always been a difficult problem in the industry. In the later stage, the holes are repeatedly repaired. The deeper and harder the holes are, the more difficult they are to drill. The cost of using rotary drilling rigs to drill holes remains high.

[0006] In order to solve the above-mentioned problems in rock drilling, a square hole forming process for rock formations has become an urgent problem to be solved by the whole society. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a technical solution: a square hole forming process for rock formations, comprising the following method steps:

[0008] (1) First, a rotary drilling rig is selected for drilling. The first drill uses the rotary drilling rig to drill a large hole in the rock formation;

[0009] (2) Select a small down-the-hole drill to drill several small holes. The small down-the-hole drill drills multiple small holes around the punched hole;

[0010] (3) Selecting to use a hydraulic splitting rod to vibrate and fracture the rock, and using the hydraulic splitting rod to fracture the rock between a number of small holes and a large hole;

[0011] (4) Use a square drill to mill off the irregular parts to complete the square hole in the rock formation.

[0012] Furthermore, in step (1), the top of the large hole drilled by the rotary drilling rig is close to the top of the square hole to be drilled on the rock formation, the bottom of the large hole is close to the bottom of the square hole to be drilled on the rock formation, and the large hole is located at the center of the square hole to be drilled.

[0013] Furthermore, the small holes drilled by the small down-the-hole drill in step (2) are symmetrically distributed on both sides of the large hole.

[0014] Furthermore, the small holes are distributed in a U-shaped structure on one side of the punching, the opening of the U-shaped structure faces the large hole, and the spacing between two adjacent groups of small holes is equal.

[0015] The advantages of the invention compared with the prior art are:

[0016] The present invention firstly uses a rotary drilling rig to drill a large hole in the middle, which can avoid the problem of using a rotary drilling rig to drill multiple large holes and offset holes. Then, a down-the-hole drill is used to drill small holes in the periphery, which does not directly face the open surface, ensuring that the offset holes will not occur. A hydraulic splitting rod is then used to vibrate and crack the rock between the small hole and the large hole. Through the above operation, the drilling of square holes on the rock formation can be quickly completed, which reduces the cost compared with the prior art and improves the quality and efficiency of the square holes in the rock formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a square hole forming process for rock formations according to the present invention;

[0018] Figure 2 It is a structural schematic diagram of process 1 in the background technology;

[0019] Figure 3 It is a structural schematic diagram of process 2 in the background technology. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] The present invention is described in detail with reference to the accompanying drawings.

[0022] like Figure 1 As shown, the present invention provides a square hole forming process for rock formations in a specific implementation, including the following method steps:

[0023] (1) First, a rotary drilling rig is selected for drilling. The first drill uses the rotary drilling rig to drill a large hole in the rock formation;

[0024] (2) Select a small down-the-hole drill to drill several small holes. The small down-the-hole drill drills multiple small holes around the punched hole;

[0025] (3) Selecting to use a hydraulic splitting rod to vibrate and fracture the rock, and using the hydraulic splitting rod to fracture the rock between the large hole and the plurality of small holes;

[0026] (4) Use a square drill to mill off the irregular parts to complete the square hole in the rock formation.

[0027] Example:

[0028] In a specific implementation example of the present invention, a large hole can be drilled in the center of a square hole that needs to be drilled in the on-site rock formation. The large hole is drilled in the rock formation using a first drill and a rotary drilling rig, and the top and bottom ends of the drilled hole fit the top and bottom of the square hole in the rock formation.

[0029] Then use a small down-the-hole drill to drill multiple small holes around the hole. Drill a row of small holes evenly on each side of the square that needs to be drilled. The small holes are distributed in a straight line. At the same time, drill two small holes on both sides of the large hole.

[0030] The rocks between the small holes and the rocks between the small holes and the large holes are vibrated and fractured by hydraulic splitting rods.

[0031] Finally, a square hole can be drilled in the rock formation by milling off the irregular parts with a square drill.

[0032] The square holes drilled in the rock formation by this embodiment can greatly improve the efficiency of rock formation drilling, and the above-mentioned drilling process can avoid the phenomenon of large holes and biased holes; among them, the down-the-hole drill is very efficient in drilling small holes and the price is low.

[0033] As a further explanation of the present invention, the top of the large hole drilled by the rotary drilling rig in step (1) is close to the top of the square hole to be drilled in the rock formation, the bottom of the large hole is close to the bottom of the square hole to be drilled in the rock formation, and the large hole is located at the center of the square hole to be drilled.

[0034] As a further elaboration of the present invention, the small holes drilled by the small down-the-hole drill in step (2) are symmetrically distributed on both sides of the large hole.

[0035] As a further elaboration of the present invention, the small holes are distributed in a U-shaped structure on one side of the punching, the opening of the U-shaped structure faces the large hole, and the spacing between two adjacent groups of small holes is equal.

[0036] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A square hole forming process for rock formations, characterized in that: The method comprises the following steps: (1) First, a rotary drilling rig is selected for drilling. The first drill uses the rotary drilling rig to drill a large hole in the rock formation; (2) Select a small down-the-hole drill to drill several small holes. The small down-the-hole drill drills multiple small holes around the punched hole; (3) Selecting to use a hydraulic splitting rod to vibrate and fracture the rock, and using the hydraulic splitting rod to fracture the rock between a number of small holes and a large hole; (4) Use a square drill to mill off the irregular parts to complete the square hole in the rock formation.

2. A square hole forming process for rock formations according to claim 1, characterized in that: In the step (1), the top of the large hole drilled by the rotary drilling rig is close to the top of the square hole to be drilled on the rock formation, the bottom of the large hole is close to the bottom of the square hole to be drilled on the rock formation, and the large hole is located at the center of the square hole to be drilled.

3. A square hole forming process for rock formations according to claim 1, characterized in that: In the step (2), the small holes drilled by the small down-the-hole drill are symmetrically distributed on both sides of the large hole.

4. A square hole forming process for rock formations according to claim 3, characterized in that: The small holes are distributed in a U-shaped structure on one side of the punching, the opening of the U-shaped structure faces the large hole, and the spacing between two adjacent groups of small holes is equal.

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