Non-excavation horizontal directional drilling construction method for underneath passing of existing power pipe

Abstract

The invention relates to the technical field of construction buildings, in particular to a non-excavation horizontal directional drilling construction method for underneath penetrating an existing power pipe, which comprises the following steps: S1, after a guide drill bit is butted with a drill rod, the drill rod is connected with construction equipment, and the construction equipment is started; s2, the guide drill bit starts to construct, and the main drill bit and the auxiliary drill bits on the periphery conduct digging at the same time; s3, water is sprayed through water outlet holes in the middle of the main drill bit and the auxiliary drill bit, and the digging speed is increased; s4, after the guide drill bit completes excavation of the guide tunnel of the guide drill bit, an abutting block on a drill rod is rotated to be opened, then a guide groove formed in an expansion drill bit is in butt joint, and the expansion drill bit slides into a fixing groove after sliding to the tail end along with a U-shaped groove, so that the expansion drill bit is arranged on the guide drill bit in a sleeving mode; s5, the butt joint pipeline is aligned to the water outlet hole, and water sprayed out of the water outlet hole enters the butt joint pipeline and then is sprayed out through a water passing hole in the other end of the butt joint pipeline; and S6, after expansion of the expansion drill bit is completed, the expansion drill bit is pushed to be separated from the guide drill bit, and disassembly is completed.

Claims

1. A trenchless horizontal directional drilling device for drilling under an existing power pipeline, characterized in that: It includes a guiding drill bit (1) and an expanding drill bit (2). The guiding drill bit (1) is fixedly provided with a drill pipe (3). A plurality of abutting blocks (30) are rotatably arranged on the drill pipe (3). The plurality of abutting blocks (30) are circumferentially and arrayedly distributed on the drill pipe (3). One side of the output end of the expanding drill bit (2) is fixedly provided with an expanding main body (20). A plurality of guiding grooves (4) are formed inside the expanding main body (20). One end of each guiding groove (4) is provided with a C-shaped groove (40) formed on the expanding main body (20). One end of the C-shaped groove (40) far from the guiding groove (4) is provided with a fixing groove (41) opened towards the guiding groove (4). The abutting blocks (30) slide in the guiding groove (4), the C-shaped groove (40) and the fixing groove (41).

2. According to claim 1, a trenchless horizontal directional drilling device for drilling under an existing power pipeline is characterized in that: The guiding drill bit (1) includes a guiding main body (10) and a main drill bit (11) fixedly arranged in the middle of the guiding main body (10). A plurality of secondary drill bits (12) fixedly connected to the expanding main body (20) are arranged around the main drill bit (11). A water outlet hole (13) is formed on the guiding main body (10). The water outlet hole (13) is arranged between the main drill bit (11) and the secondary drill bits (12).

3. According to claim 1, a trenchless horizontal directional drilling device for drilling under an existing power pipeline is characterized in that: One end of the expanding drill bit (2) far from the expanding main body (20) is provided with a blocking body (21). One end of the blocking body (21) close to the fixing groove (41) is provided with a butting groove (22). The side wall of the main drill bit (11) is clamped with the butting groove (22).

4. According to claim 3, a trenchless horizontal directional drilling device for drilling under an existing power pipeline is characterized in that: A butting pipe (23) is arranged inside the blocking body (21). The butting pipe (23) is embedded in the blocking body (21). A water passing hole (24) is formed on the surface of the expanding drill bit (2). One end of the butting pipe (23) is fixedly connected to the water passing hole (24). The other end of the butting pipe (23) far from the water passing hole (24) is inserted into the water outlet hole (13).

5. The trenchless horizontal directional drilling device for drilling under an existing power pipeline according to claim 4, characterized in that: The butting pipe (23) is made of a semi-soft material pipe.

6. The trenchless horizontal directional drilling device for drilling under an existing power pipeline according to claim 4, characterized in that: One end of the butting pipe (23) far from the water passing hole (24) is provided with a rubber layer (5). The rubber layer (5) is fixedly connected to the blocking body (21).

7. The trenchless horizontal directional drilling device for drilling under an existing power pipeline according to claim 2, characterized in that: A diffusion thread groove (14) is formed inside the water outlet hole (13). The diffusion thread grooves (14) are evenly distributed inside the water outlet hole (13).

8. The trenchless horizontal directional drilling device for drilling under an existing power pipeline according to claim 1, characterized in that: A placing groove (31) formed on the drill pipe (3) is arranged at the bottom of the abutting block (30). The abutting block (30) is rotatably connected to the placing groove (31).

9. The trenchless horizontal directional drilling device for drilling under an existing power pipeline according to claim 1, characterized in that: One end of the expanding main body (20) close to the guiding main body (10) is provided with an inclined surface.

10. A construction method for non-excavation horizontal directional drilling under an existing power pipe, including a non-excavation horizontal directional drilling device as described in any one of claims 1-9, comprising the following steps: S1. After the guiding drill bit (1) is butted with the drill pipe (3), the drill pipe (3) is connected to the construction equipment, and the construction equipment is started; S2. The guiding drill bit (1) starts construction, and the main drill bit (11) and the surrounding secondary drill bits (12) simultaneously carry out excavation; S3, the main drill bit (11) and the water outlet hole (13) in the middle of the slave drill bit (12) spray water to increase the excavation speed; S4, when the guide drill bit (1) has completed the excavation of its guide tunnel, the abutment block (30) on the drill rod (3) is first rotated to open, and then the guide groove (4) provided on the expansion drill bit (2) is docked, and the guide groove (4) and the abutment block (30) are docked and slide to the end along with the U-shaped groove (40), and then slide into the fixed groove (41), so that the expansion drill bit (2) is sleeved on the guide drill bit (1); S5, the docking pipe (23) is aligned with the water outlet hole (13), so that the water ejected from the water outlet hole (13) enters the docking pipe (23), and then ejects through the water hole (24) at the other end of the docking pipe (23), so that the water of the expansion drill bit (2) can be ejected normally; S6. After the expansion drill bit (2) has completed expansion, the expansion drill bit (2) is pushed to separate from the guide drill bit (1), thereby completing the disassembly.

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