Hole grinding drill for removing obstacles of underground diaphragm wall in shield crossing area

Abstract

The utility model relates to a hole grinding drill used for removing obstacles of an underground diaphragm wall in a shield crossing area, and solves the problems that in the hole expanding and obstacle removing technology of the shield crossing area, a hole expanding drill can only conduct hole expanding on one point position every time, efficiency is low, and the point position control difficulty is large. The device is connected to the lower end of a drill rod and comprises an upper guide part and a lower guide part, a connecting section is arranged between the upper guide part and the lower guide part, a plurality of hinge shafts are evenly arranged on the circumference of the end, close to the upper guide part, of the connecting section, the hinge shafts are connected with cutter heads capable of swinging inwards and outwards, and spring pieces for bouncing the cutter heads outwards are arranged at the hinge shafts. The cutter head is provided with a cutter edge which is arranged downwards; when the cutterhead is in a storage state close to the connecting section, the outer diameter of the cutterhead does not exceed the outer diameter of the lower guide part. After the reamer is used for reaming at the highest point of the obstacle clearing range, the hole grinding drill is replaced, the whole-section hole grinding construction can be carried out downwards, the obstacle clearing efficiency of an underground diaphragm wall in a shield crossing area is greatly improved, and the reaming positioning requirement is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering construction, and relates to a reaming device for hard targets, in particular to a grinding drill for removing obstacles from diaphragm walls in the shield tunneling area. Background Technique

[0002] With the acceleration of the urbanization process, more and more subway lines are under construction. The early built subway platforms did not consider the subsequent subway tunnel planning, or the subsequent subway construction plan was readjusted. The existing diaphragm walls of the subway stations have become obstacles to the new subway lines. The construction of subway stations usually uses the mined tunneling method or the cut-and-cover method. Both of these construction methods require diaphragm walls to isolate the external environment of the station. Such diaphragm walls generally have a depth of more than 20 meters, blocking the passage of the shield machines of the new subway tunnels, thus affecting the overall urban subway traffic planning.

[0003] For the conventional removal of obstacles from diaphragm walls, a foundation pit is usually excavated on one side of the diaphragm wall, and then the shield tunneling area of the diaphragm wall is cleared from one side of the foundation pit. This construction method has a large construction area, a long construction period, and a high construction cost. The invention patent applied for before this application, with the application number 2024105620714, discloses a method for removing obstacles from the subway shield area of a diaphragm wall using drilling construction. Drilling is directly carried out downward from the top surface of the diaphragm wall to the shield tunneling area, and then the shield tunneling area is reamed. The reaming width is greater than the thickness of the diaphragm wall, so as to clear the diaphragm wall. However, the existing reaming drills can only be used for single-point reaming, that is, each time the existing reaming drill reams, it can only complete the reaming of one point. If the entire range of the shield tunneling area needs to be reamed and cleared, it is necessary to stepwise ream from bottom to top for each drilling in the shield tunneling area. Due to the large depth of the shield area and the fact that the reaming and obstacle removal area cannot be directly seen, there are extremely high requirements for the control of the position of each reaming operation. Content of the Utility Model

[0004] The purpose of the utility model is to solve the problems in the technology of removing obstacles from the diaphragm wall in the shield tunneling area by drilling and reaming, that is, the reaming drill can only ream one point each time, with low efficiency and great difficulty in position control. A grinding drill for removing obstacles from the diaphragm wall in the shield tunneling area is provided. When cooperating with the reaming drill for construction, after using the reaming drill to ream the highest point of the obstacle removal area, taking the reamed position as the starting working hole, the whole-section grinding construction can be carried out downward. At the same time, this device can also be used for the reaming and grinding construction of other hard targets.

[0005] The technical solution adopted by the utility model to solve its technical problems is as follows: A hole-grinding drill for removing obstacles from the diaphragm wall in the shield tunneling area is connected to the lower end of a drill pipe and includes an upper guiding part and a lower guiding part. A connecting section is arranged between the upper guiding part and the lower guiding part. A plurality of hinge shafts are evenly arranged in the circumferential direction at one end of the connecting section close to the upper guiding part. The hinge shafts are connected with a cutter head that can swing in and out. A spring piece for elastically pushing the cutter head outwards is arranged at the hinge shaft. The cutter head is provided with a cutting edge, and the cutting edge is arranged downwards; when the cutter head is in the retracted state against the connecting section, the outer diameter of the cutter head does not exceed the outer diameter of the lower guiding part.

[0006] When this device is in use, it is necessary to first drill a guiding hole, and then use a hole-expanding drill at the upper end of the guiding hole to expand the starting working hole at the highest point of obstacle removal. Install the hole-grinding drill of this device at the lower end of the drill pipe. The cutter head fits and retracts against the connecting section and sinks along the guiding hole with the drill pipe. When the hole-grinding drill reaches the depth of the starting working hole, the cutter head is elastically pushed outwards under the action of the spring piece, and the cutting edge is downward. Then the drill pipe rotates and applies a downward force, and the cutter head rotates and cuts to grind the hole, and the diaphragm wall is cleared of obstacles in a whole-section downward manner. During the obstacle removal process, the lower guiding part guides along the guiding hole.

[0007] Preferably, the outer diameters of the upper guiding part and the lower guiding part are the same, and the outer diameter of the connecting section is smaller than the outer diameter of the lower guiding part.

[0008] Preferably, a water inlet pipe is arranged at the center of the drill pipe, the upper guiding part, the connecting section and the lower guiding part.

[0009] Preferably, when the cutter head is in the unfolded state, the upper end surface of the cutter head abuts against the lower surface of the upper guiding part, and the cutter head and the connecting section are arranged at 90 degrees.

[0010] Preferably, the outer end of the cutting edge protrudes from the circumferential direction of the cutter head.

[0011] Preferably, a guiding hole is centrally opened in the diaphragm wall, and the outer diameters of the upper guiding part and the lower guiding part do not exceed the inner diameter of the guiding hole.

[0012] Preferably, a working starting hole formed by hole expansion with a hole-expanding drill is arranged at the top of the guiding hole in the shield tunneling area.

[0013] Preferably, when the cutter head swings outwards and unfolds, the rotation diameter of the cutter head is larger than the thickness of the diaphragm wall.

[0014] The utility model cooperates with the hole-expanding drill for construction. After using the hole-expanding drill to expand the hole at the highest point of the obstacle removal range, replace the hole-grinding drill of this device, and the whole-section hole-grinding construction can be carried out downwards, greatly improving the obstacle removal efficiency of the diaphragm wall in the shield tunneling area and reducing the hole-expanding positioning requirements; this device is also applicable to the hole-expanding and hole-grinding construction of other hard surfaces. Description of the Drawings

[0015] The present utility model will be further described below in conjunction with the accompanying drawings.

[0016] Figure 1 It is a structural diagram of the cutter head storage state of the present utility model.

[0017] Figure 2 It is a structural diagram of the cutter head deployment state of the present utility model.

[0018] Figure 3 It is a construction state diagram of the present utility model.

[0019] In the figure: 1, drill pipe; 2, upper guiding part; 3, lower guiding part; 4, connecting section; 5, water inlet pipe; 6, hinge shaft; 7, spring piece; 8, cutter head; 9, cutting edge; 10, diaphragm wall; 11, working starting hole; 12, guiding drill hole. Specific embodiments

[0020] The present utility model will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0021] Embodiment: A hole grinding drill for removing obstacles in the diaphragm wall in the shield tunneling area, as Figure 1 、 2 shown. This hole grinding drill is connected to the lower end of the drill pipe 1 and includes an upper guiding part 2 and a lower guiding part 3. A connecting section 4 is arranged between the upper guiding part and the lower guiding part. The outer diameters of the upper guiding part and the lower guiding part are the same, and the outer diameter of the connecting section is smaller than that of the lower guiding part. A water inlet pipe 5 is arranged at the centers of the drill pipe 1, the upper guiding part 2, the connecting section 4, and the lower guiding part 3.

[0022] A plurality of hinge shafts 6 are evenly arranged in the circumferential direction at one end of the connecting section 4 close to the upper guiding part 2. The hinge shafts 6 are connected to a cutter head 8 that can swing in and out. A spring piece 7 that elastically pushes the cutter head outwards is arranged at the hinge shaft. The cutter head is provided with a cutting edge 8, and the cutting edge 8 is arranged downward. As Figure 1 shown, when the cutter head 8 is in the storage state against the connecting section, the outer diameter of the cutter head 8 does not exceed the outer diameter of the lower guiding part 3. As Figure 2 shown, when the cutter head 8 is in the deployed state, the upper end surface of the cutter head abuts against the lower surface of the upper guiding part 2, and the cutter head 8 is arranged at 90 degrees to the connecting section 4. The outer end of the cutting edge protrudes from the circumference of the cutter head.

[0023] As Figure 3 shown, when this device is used in construction, a guiding drill hole 12 is centrally formed in the diaphragm wall 10. A working starting hole 11 formed by reaming with a reaming drill is arranged at the top of the guiding drill hole in the shield tunneling area. The outer diameters of the upper guiding part 2 and the lower guiding part 3 do not exceed the inner diameter of the guiding drill hole 12. The diameter of the working starting hole 11 is not less than the thickness of the diaphragm wall 10. When the cutter head 8 swings outwards and is in the deployed state, the rotation diameter of the cutter head is greater than the thickness of the diaphragm wall 10.

[0024] The hole grinding drill is installed at the lower end of the drill pipe. The cutter head is received in the fitting connection section and sinks along the guide hole with the drill pipe. When the hole grinding drill reaches the depth of the starting working hole, the cutter head springs outwards under the action of the spring piece, with the cutting edge facing downwards. Subsequently, the drill pipe rotates and applies a downward force, and the cutter head rotates for cutting to grind the hole, performing a whole-section clearance of the diaphragm wall underground in a downward direction. During the construction process, the water inlet pipe continuously supplies water for cooling and diluting the slurry, and the slurry water is pumped out by the water extraction pipe.

Claims

1. A hole-grinding drill for clearing underground continuous walls in shield tunneling areas, connected to the lower end of a drill rod, characterized in that: It comprises an upper guide part and a lower guide part, a connecting section is arranged between the upper guide part and the lower guide part, a plurality of hinge shafts are evenly arranged around one end of the connecting section close to the upper guide part, a cutter disc which can swing inwards and outwards is connected to the hinge shaft, a spring sheet which bounces the cutter disc outwards is arranged at the hinge shaft, the cutter disc is provided with a blade, and the blade is arranged downwards; when the cutter disc is stored against the connecting section, the outer diameter of the cutter disc does not exceed the outer diameter of the lower guide part.

2. A hole-grinding drill for clearing underground continuous walls in shield tunneling areas according to claim 1, characterized in that: The outer diameters of the upper guide portion and the lower guide portion are consistent, and the outer diameter of the connecting section is smaller than the outer diameter of the lower guide portion.

3. The hole-grinding drill for clearing underground continuous walls in shield tunneling areas according to claim 1, characterized in that: A water inlet pipe is arranged at the center of the drill rod, the upper guide part, the connecting section and the lower guide part.

4. The hole-grinding drill for clearing underground continuous walls in shield tunneling areas according to claim 1, characterized in that: When the cutter disc is in an unfolded state, the upper end surface of the cutter disc abuts against the lower surface of the upper guide portion, and the cutter disc and the connecting section are arranged at 90 degrees.

5. The hole-grinding drill for clearing underground continuous walls in shield tunneling areas according to claim 1, characterized in that: The outer end of the knife edge protrudes from the circumference of the knife disc.

6. The hole-grinding drill for clearing underground continuous walls in shield tunneling areas according to claim 1, characterized in that: A guide borehole is opened in the center of the underground continuous wall, and the outer diameters of the upper guide part and the lower guide part do not exceed the inner diameter of the guide borehole.

7. A hole-grinding drill for clearing underground continuous walls in shield tunneling areas according to claim 6, characterized in that: The guide borehole is provided with a working starting hole formed by expanding the hole with an expansion drill at the top of the shield tunneling crossing area.

8. The hole-grinding drill for clearing underground continuous walls in shield tunneling areas according to claim 1, characterized in that: When the cutter disc is swung outward and expanded, the rotation diameter of the cutter disc is greater than the thickness of the underground continuous wall.

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