Vertical hole grinding drill for replacing large-aperture coring in diaphragm wall barrier breaking area

Abstract

The utility model relates to a vertical hole grinding drill for replacing large-aperture coring in an obstacle breaking area of an underground diaphragm wall, and solves the problems that the underground diaphragm wall is of a high-strength reinforced concrete structure, the drilling diameter is large, the drilling depth is large, and a traditional coring drill bit is insufficient in transmission torque in the process of drilling a construction hole in the underground diaphragm wall. The device comprises a drill bit, a drill rod is connected to the upper portion of the drill bit, the drill bit comprises a connecting section, a sleeve section and a grinding section from top to bottom, a grinding disc is arranged at the bottom of the grinding section, annular teeth are arranged on the circumference of the bottom face of the grinding disc, a plurality of grinding heads are distributed in the middle of the bottom face of the grinding disc, and water injection holes are formed in the positions, at gaps of the grinding heads, of the bottom face of the grinding disc. And an overflow slurry discharging channel is formed between the outer wall of the drill bit and the drill hole. The grinding head is arranged on the grinding disc on the bottom surface of the drill bit and is matched with an annular tooth structure of an original coring sleeve to grind the bottom surface of a drill hole and slowly push the drill hole, so that the drilling construction requirements of large-depth and high-strength materials are met.

Description

Technical Field

[0001] This utility model belongs to the technical field of drilling equipment, and relates to a grinding device for clearing obstacles in high-strength concrete continuous walls, and in particular to a vertical grinding drill that can replace large-diameter core sampling in the obstacle-breaking area of ​​diaphragm walls. Background Technology

[0002] With the acceleration of urbanization, more and more subway lines are under construction. Early subway station platforms were not designed with future subway tunnel planning in mind, or subsequent subway construction plans were readjusted. As a result, the diaphragm walls of existing subway stations have become obstacles to new subway lines. Subway station construction typically uses either the cut-and-cover method or the open-cut method, both of which require diaphragm walls to isolate the station from the external environment. These diaphragm walls are generally over 20 meters deep, hindering the passage of tunnel boring machines (TBMs) for new subway tunnels and thus affecting the overall urban subway transportation planning.

[0003] The applicant previously filed a patent application for a method to clear obstacles in subway shield tunneling areas using diaphragm walls constructed with boreholes, published on July 30, 2024, with publication number CN118407767A. This patent application involved drilling a construction hole downwards from the top of the diaphragm wall to the subway shield tunneling area. Then, a reaming drill was lowered along the construction hole into the subway shield tunneling area, gradually hollowing out the portion of the diaphragm wall corresponding to the subway shield tunneling area. This replaced the reinforced concrete of the diaphragm wall within the tunneling area with cement-expanding mortar to facilitate subsequent tunneling. However, diaphragm walls are high-strength reinforced concrete structures with dense reinforcement, and the construction depth is typically over 10 meters. The diameter of the core samples obtained from the boreholes reaches 40 cm or more. Traditional core drill bits do not transmit sufficient torque during the drilling process, failing to meet the construction requirements. Utility Model Content

[0004] The purpose of this invention is to solve the problem that traditional coring drill bits are insufficient in transmitting torque when drilling construction holes in diaphragm walls, which are high-strength reinforced concrete structures with large drilling diameters and depths. This invention provides a vertical grinding drill to replace large-diameter coring in the obstacle-breaking area of ​​the diaphragm wall. A grinding disc is added to the bottom surface of the drill bit, and grinding heads are arranged on the grinding disc. Grinding is used for drilling construction, which meets the drilling construction requirements of high-strength reinforced concrete diaphragm walls.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a vertical grinding drill for replacing large-diameter coring in the diaphragm wall obstacle area, including a drill bit, a drill rod connected above the drill bit, the drill bit including a connecting section, a sleeve section and a grinding section from top to bottom, the bottom of the grinding section is a grinding disc, the bottom surface of the grinding disc is surrounded by annular teeth, a number of grinding heads are distributed in the middle of the bottom surface of the grinding disc, water injection holes are provided in the gaps between the grinding heads on the bottom surface of the grinding disc, and an overflow slurry discharge channel is formed between the outer wall of the drill bit and the drill hole.

[0006] This device is designed for drilling and grinding deep, high-strength concrete continuous walls. Application scenarios include drilling in subway shield tunneling areas with diaphragm walls, as described in the background section. Because this drilling scenario requires drilling into high-strength reinforced concrete with a relatively dense reinforcing mesh, traditional core drills cannot meet the torque requirements. This device uses a grinding head mounted on a grinding disc on the bottom of the drill bit, working in conjunction with the annular tooth structure of the original core sleeve to grind the bottom surface of the borehole, allowing for slow advancement and meeting the drilling requirements for deep, high-strength materials.

[0007] Preferably, the drill rod is provided with a water injection channel, and the sleeve section and the connecting section above the grinding disc of the grinding section are hollow structures that communicate with the water injection channel.

[0008] Preferably, the upper part of the grinding head is a connecting seat, and the bottom end of the connecting seat is provided with a straight grinding strip.

[0009] Preferably, the grinding disc has a mounting hole in the middle corresponding to the grinding head, and the connecting seat of the grinding head is fastened with bolts at the mounting hole.

[0010] Preferably, the grinding heads are arranged in multiple layers radially outward from the center on the bottom surface of the grinding disc, with each layer of grinding heads distributed in a ring.

[0011] Alternatively, the grinding heads are arranged in a staggered manner from the center of the bottom surface of the grinding disc outwards, with the staggered grinding heads filling the grinding gaps. The grinding heads on the grinding disc are distributed on each diameter ring, reducing grinding dead angles and improving grinding efficiency.

[0012] Preferably, the grinding head at the center of the grinding disc's bottom surface is an irregularly shaped grinding head, and the connecting seat of the irregularly shaped grinding head is rectangular, with the direction perpendicular to the grinding strip being the width direction. One grinding head is arranged on each side of the irregularly shaped grinding head at the center of the grinding disc along the width direction, and the grinding strip of each grinding head is perpendicular to the grinding strip of the irregularly shaped grinding head. In a traditional uniformly distributed structure, the circumference of the grinding head at the center of the grinding disc is prone to annular grinding dead angles. Conventional grinding head connecting seats are generally square or nearly polygonal. However, this structure uses an irregularly shaped grinding head, and the connecting seat is flat and elongated. Conventional grinding heads are arranged close to each other on both sides of the connecting seat along the width direction, allowing the grinding strips to fill the annular grinding gaps after rotation, reducing grinding dead angles.

[0013] Preferably, the grinding head is a steel grinding head.

[0014] Preferably, the bottom end of the grinding head is flush with the bottom end of the annular teeth. The lower end of the annular teeth is lower than the surface of the grinding disc, which is equivalent to forming an upward groove structure at the position of the grinding disc. The annular teeth and the bottom end of the grinding head are flush, allowing for synchronous grinding. The annular teeth are toothed, with gaps between adjacent teeth for the overflow of mud and water.

[0015] Preferably, the outer diameter of the connecting section of the drill bit is smaller than the outer diameter of the sleeve section, and the upper end of the connecting section of the drill bit is provided with a thread for connecting to the drill rod; the connecting section and the center of the top surface of the sleeve section are welded together, and a reinforcing angle plate is provided around the weld; the lower end of the sleeve section and the upper end of the grinding section are threaded together.

[0016] This utility model uses a grinding head set on the grinding disc on the bottom of the drill bit, which, together with the annular tooth structure of the original core sleeve, grinds the bottom surface of the drill hole and slowly advances, meeting the drilling requirements of deep and high-strength materials. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of a drill bit structure according to this utility model.

[0019] Figure 2 This is a schematic diagram of the bottom structure of the first type of drill bit of this utility model.

[0020] Figure 3 This is the utility model Figure 2 A schematic diagram of the grinding disc structure.

[0021] Figure 4 This is a schematic diagram of the bottom structure of the second type of drill bit of this utility model.

[0022] Figure 5 This is the utility model Figure 4 A schematic diagram of the misaligned structure of the grinding head.

[0023] In the diagram: 1. Connecting section, 2. Sleeve section, 3. Grinding section, 4. Reinforcing angle plate, 5. Grinding disc, 6. Grinding head, 7. Water injection hole, 8. Ring tooth, 9. Connecting seat, 10. Grinding strip, 11. Mounting hole, 12. Irregular grinding head. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0025] Example 1: A vertical grinding drill to replace large-diameter coring in diaphragm wall obstacle areas, such as... Figure 1As shown. This device includes a drill bit, with a drill rod connected above it. The drill bit, from top to bottom, includes a connecting section 1, a sleeve section 2, and a grinding section 3. The outer diameter of the connecting section 1 is smaller than the outer diameter of the sleeve section 2. The upper end of the connecting section 1 is threaded for connection with the drill rod. The connecting section 1 and the sleeve section 2 are welded together at their top center, with a reinforcing angle plate 4 circumferentially provided at the weld. The lower end of the sleeve section 2 is threaded together with the upper end of the grinding section 3. Figure 2 , 3 As shown, the bottom of the grinding section 3 is a grinding disc 5, and the bottom surface of the grinding disc 5 is surrounded by annular teeth 8. Several grinding heads 6 are distributed in the middle of the bottom surface of the grinding disc. Water injection holes 7 are provided at the gaps between the grinding heads on the bottom surface of the grinding disc. An overflow drainage channel is formed between the outer wall of the drill bit and the drill hole. The bottom end of the grinding head 6 is flush with the bottom end of the annular teeth 8. It is a black steel grinding head. A water injection channel is provided inside the drill rod. Above the grinding disc 5 of the grinding section 3, the sleeve section 2 and the connecting section 1 are hollow structures communicating with the water injection channel.

[0026] The upper part of the grinding head 6 is a connecting seat 9, and the bottom end of the connecting seat is provided with a straight grinding strip 10. For example... Figure 3 As shown, mounting holes 11 are opened in the middle of the grinding disc 5 corresponding to the grinding head 6, and the connecting seat of the grinding head is fastened with bolts at the mounting holes. The grinding heads are arranged in multiple layers radially outward from the center on the bottom surface of the grinding disc, and each layer of grinding heads is distributed along a ring.

[0027] Example 2: A vertical grinding drill to replace large-diameter coring in diaphragm wall obstacle areas, such as... Figure 4 , 5 As shown. Grinding heads 6 are arranged in a staggered manner from the center of the bottom surface of the grinding disc outwards, and the staggered grinding heads fill the grinding gaps with each other. The grinding head at the center of the bottom surface of the grinding disc 5 is an irregularly shaped grinding head 12. The connecting seat of the irregularly shaped grinding head is rectangular, with the direction perpendicular to the grinding strip 10 being the width direction. A grinding head is set on each side of the width direction of the irregularly shaped grinding head at the center of the grinding disc, and the grinding strip of the grinding head is perpendicular to the grinding strip of the irregularly shaped grinding head.

Claims

1. A vertical grinding drill for large-diameter coring in areas where diaphragm walls are breached, comprising a drill bit and a drill rod connected above the drill bit, characterized in that: The drill bit includes a connecting section, a sleeve section, and a grinding section from top to bottom. The bottom of the grinding section is a grinding disc with annular teeth around its circumference. Several grinding heads are distributed in the middle of the bottom surface of the grinding disc. Water injection holes are provided in the gaps between the grinding heads on the bottom surface of the grinding disc. An overflow slurry discharge channel is formed between the outer wall of the drill bit and the drill hole.

2. The vertical grinding drill for replacing large-diameter core sampling in diaphragm wall obstacle breach areas according to claim 1, characterized in that: The drill rod is provided with a water injection channel, and the sleeve section and connecting section above the grinding disc of the grinding section are hollow structures that communicate with the water injection channel.

3. A vertical grinding drill for replacing large-diameter core sampling in diaphragm wall obstacle breach areas as described in claim 1, characterized in that: The upper part of the grinding head is a connecting seat, and the bottom of the connecting seat is provided with a straight grinding strip.

4. A vertical grinding drill for replacing large-diameter core sampling in diaphragm wall obstacle breach areas as described in claim 3, characterized in that: The grinding disc has mounting holes in the middle corresponding to the grinding head, and the connecting seat of the grinding head is fastened with bolts at the mounting holes.

5. A vertical grinding drill for replacing large-diameter core sampling in diaphragm wall obstacle breach areas as described in claim 3 or 4, characterized in that: The grinding heads are arranged in multiple layers radially outward from the center on the bottom surface of the grinding disc, with each layer of grinding heads distributed in a ring.

6. A vertical grinding drill for replacing large-diameter coring in diaphragm wall breach areas according to claim 3 or 4, characterized in that: The grinding heads are arranged in a staggered manner from the center of the bottom surface of the grinding disc outwards, and the staggered grinding heads fill the grinding gaps with each other.

7. A vertical grinding drill for replacing large-diameter core sampling in diaphragm wall obstacle breach areas according to claim 6, characterized in that: The grinding head at the center of the bottom surface of the grinding disc is an irregularly shaped grinding head. The connecting seat of the irregularly shaped grinding head is rectangular, with the direction perpendicular to the grinding strip being the width direction. A grinding head is set on each side of the width direction of the irregularly shaped grinding head at the center of the grinding disc, and the grinding strip of the grinding head is perpendicular to the grinding strip of the irregularly shaped grinding head.

8. A vertical grinding drill for replacing large-diameter core sampling in diaphragm wall obstacle breach areas according to claim 1, characterized in that: The grinding head is a steel grinding head.

9. A vertical grinding drill for replacing large-diameter core sampling in diaphragm wall obstacle breach areas according to claim 1, characterized in that: The bottom end of the grinding head is flush with the bottom end of the annular tooth.

10. A vertical grinding drill for replacing large-diameter coring in diaphragm wall obstacle breach areas according to claim 1, characterized in that: The outer diameter of the connecting section of the drill bit is smaller than that of the sleeve section. The upper end of the connecting section of the drill bit is provided with a thread for connecting to the drill rod. The connecting section and the center of the top surface of the sleeve section are welded together, and a reinforcing angle plate is provided around the weld. The lower end of the sleeve section is threaded together with the upper end of the grinding section.

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