Long-pitch drill rod for complex geology

Abstract

The utility model discloses a long-pitch drill rod for complex geology, which comprises a plurality of drill rod main bodies which are sequentially connected end to end, and helical blades are respectively and fixedly wound on the peripheral wall of each drill rod main body; the lower end of each drill rod body located in the middle is fixedly provided with an inserting head, and the upper end of each drill rod body located in the middle is provided with an inserting hole matched with the corresponding inserting head. The connecting plug is fixedly arranged in the middle of the lower end of the uppermost drill rod body, and a power connector used for being in transmission connection with a drilling machine driving mechanism is fixedly arranged at the upper end of the uppermost drill rod body. The inserting hole is fixedly formed in the upper end of the drill rod body located at the lowermost portion, and a drilling head is fixedly arranged at the lower end of the drill rod body located at the lowermost portion. Each inserting head is provided with a first connecting through hole in the radial direction, and two second connecting through holes are symmetrically formed in the inner circumferential wall of each inserting hole. The number of the drill rod bodies can be set according to the drilling depth, the hole forming quality can be guaranteed, and the drilling efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation drilling equipment technology, and in particular to a long pitch drill rod for complex geological conditions. Background Technology

[0002] Long spiral drilling rigs are commonly used equipment in foundation engineering construction, primarily for foundation drilling. They offer high drilling speeds, continuously drilling to the predetermined depth in a single pass and then withdrawing the drill rod to complete the hole, resulting in high efficiency. However, existing long spiral drill rods have a fixed length, making them unsuitable for deep pile foundation drilling. In such cases, it is often necessary to raise the main tower, a time-consuming and labor-intensive process that delays construction. To address these technical issues, current technology typically uses flange connections to fix multiple drill rods together, thus changing the overall length. However, because adjacent drill rods are connected by flanges on their outer walls, the spiral blades at the connection point cannot form a smooth transition, affecting the quality of the hole formed during subsequent drilling. In addition, the existing long-pitch drill rod structure is relatively simple, with only the front end of the spiral blades being sharpened for soil breaking and drilling. This structure has low soil breaking and drilling efficiency, and is prone to wear under complex geological conditions. Moreover, the sharpened part of the spiral blades cannot be repaired. Therefore, a long-pitch drill rod for complex geological conditions needs to be developed. Utility Model Content

[0003] The purpose of this invention is to provide a long-pitch drill pipe for complex geological conditions, thereby solving the technical problems mentioned in the background section.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] This utility model discloses a long-pitch drill rod for complex geological conditions, comprising multiple drill rod bodies connected sequentially, each with a helical blade fixedly wound around its outer peripheral wall. The lower end of the middle drill rod body is fixedly provided with a connector, and the upper end has a matching insertion hole. The lower middle of the uppermost drill rod body is fixedly provided with the connector, and the upper end has a power connector for transmission connection with the drilling rig drive mechanism. The uppermost drill rod body has the insertion hole fixedly provided at its upper end and a drill bit fixedly provided at its lower end. Each connector has a first connecting through hole radially, and two second connecting through holes symmetrically formed on the inner peripheral wall of each insertion hole. The connectors of each drill rod body are inserted into the insertion holes of adjacent drill rod bodies and fixedly connected by bolt assemblies passing through the first connecting through hole and the two second connecting through holes. After connection, the ends of the two helical blades of two adjacent drill rod bodies overlap.

[0006] Furthermore, a plurality of first drilling teeth are uniformly fixedly arranged circumferentially at the lower end of the drill rod body near the outer edge.

[0007] Furthermore, the lower end of the drill bit has a conical structure.

[0008] Furthermore, two sets of second drilling teeth are symmetrically fixed on the peripheral wall of the drill bit.

[0009] Furthermore, two limiting bosses are symmetrically fixedly provided on the outer peripheral wall of each of the plugs, and two limiting grooves are symmetrically provided on the inner peripheral wall of each of the plug holes, which are respectively adapted to the two limiting bosses.

[0010] Compared with the prior art, the beneficial technical effects of the present invention are:

[0011] This invention allows for the number of drill rod bodies to be set according to the drilling depth. Connecting drill rod bodies are fixedly connected via plug-in joints and holes, and secured with bolt assemblies. After connection, the two helical blades of adjacent drill rod bodies overlap smoothly, thus ensuring hole quality. Furthermore, when connecting adjacent drill rod bodies, the cooperation of a limiting boss and a limiting groove facilitates effective alignment of the first connecting through hole and the two second connecting holes, while also ensuring the stability of the connection between adjacent drill rod bodies.

[0012] Furthermore, this invention utilizes a conical drill bit, along with multiple first drill teeth and two sets of second drill teeth, to achieve rapid soil breaking and improve drilling efficiency. The drill bit and drill teeth structure are also less prone to wear and deformation, thus extending the service life of the long-pitch drill rod. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0016] Figure 3 This is a schematic diagram showing the fit between adjacent drill pipe bodies;

[0017] Explanation of reference numerals in the attached drawings: 1. Drill rod body; 2. Spiral blade; 3. Plug connector; 4. Plug hole; 5. Power connector; 6. Drill bit; 7. First connecting through hole; 8. Second connecting through hole; 9. Bolt assembly; 10. Limiting boss; 11. Limiting groove; 12. First drill tooth; 13. Second drill tooth. Detailed Implementation

[0018] like Figures 1-3 As shown, a long-pitch drill rod for complex geological conditions includes multiple drill rod bodies 1 connected sequentially, with helical blades 2 fixedly wound around the outer peripheral wall of each drill rod body 1 by welding.

[0019] Each drill rod body 1 located in the middle has a connector 3 fixedly installed at its lower end and a connector hole 4 adapted to the connector 3 at its upper end. The uppermost drill rod body 1 has the connector 3 fixedly installed in the middle of its lower end and a power connector 5 fixedly installed at its upper end for transmission connection with the drilling rig drive mechanism. The lowermost drill rod body 1 has the connector hole 4 fixedly installed at its upper end and a drill bit 6 fixedly installed at its lower end.

[0020] Each of the aforementioned connectors 3 has a first connecting through hole 7 radially provided, and two second connecting through holes 8 are symmetrically provided on the inner peripheral wall of each of the aforementioned connector holes 4. The connectors 3 of each of the aforementioned drill rod bodies 1 are inserted and fitted into the connector holes 4 of the adjacent drill rod bodies 1, and are fixedly connected by bolt assemblies 9 that pass through the first connecting through hole 7 and the two second connecting through holes 8, and after connection, the ends of the two helical blades 2 of the two adjacent drill rod bodies 1 overlap.

[0021] This utility model allows the number of drill rod bodies to be set according to the drilling depth. The connected drill rod bodies are fixedly connected by plug-in joints and plug-in holes and bolt assemblies. After connection, the two helical blades of adjacent drill rod bodies overlap and transition smoothly, which helps to ensure the quality of hole formation.

[0022] In addition, in this embodiment, two limiting bosses 10 are symmetrically fixedly provided on the outer peripheral wall of each of the plug-in connectors 3, and two limiting grooves 11 are symmetrically provided on the inner peripheral wall of each of the plug-in holes 4, which are respectively adapted to the two limiting bosses 10. When adjacent drill rod bodies are connected, the limiting bosses and limiting grooves cooperate with each other, which facilitates the effective alignment of the first connecting through hole and the two second connecting through holes, and also ensures the connection stability of adjacent drill rod bodies.

[0023] As a further improvement to this utility model, a plurality of first drilling teeth 12 are uniformly fixedly arranged circumferentially at the lower end of the drill rod body 1 near the outer edge. The lower end of the drill head 6 has a conical structure, and two sets of second drilling teeth 13 are symmetrically fixedly arranged on the peripheral wall of the drill head 6. By setting the drill head with a conical structure, and cooperating with multiple first drilling teeth and two sets of second drilling teeth for soil breaking drilling, the rapid breaking of soil layers is improved, and the drilling efficiency is increased. Furthermore, the drill head and drill tooth structure are not easily worn or deformed, thereby extending the service life of the long-pitch drill rod.

[0024] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A long-pitch drill pipe for complex geological conditions, characterized in that: The system comprises multiple drill rod bodies connected sequentially, each with a helical blade fixedly wound around its outer peripheral wall. The lower end of the middle drill rod body is fixedly provided with a connector, and the upper end has a matching insertion hole. The lower middle of the uppermost drill rod body is fixedly provided with the connector, and the upper end has a power connector for transmission connection with the drilling rig drive mechanism. The uppermost drill rod body has the insertion hole fixedly provided at its upper end and a drill bit fixedly provided at its lower end. Each connector has a first connecting through hole radially, and two second connecting through holes symmetrically formed on the inner peripheral wall of each insertion hole. The connector of each drill rod body is inserted into the insertion hole of an adjacent drill rod body and fixedly connected by a bolt assembly passing through the first connecting through hole and the two second connecting through holes. After connection, the ends of the two helical blades of two adjacent drill rod bodies overlap.

2. The long-pitch drill pipe for complex geological conditions according to claim 1, characterized in that: The lower end of the drill rod body at the bottom, near the outer edge, is uniformly fixed with multiple first drill teeth along the circumference.

3. The long-pitch drill pipe for complex geological conditions according to claim 1, characterized in that: The lower end of the drill bit has a conical structure.

4. The long-pitch drill pipe for complex geological conditions according to claim 3, characterized in that: Two sets of second drilling teeth are symmetrically fixed on the peripheral wall of the drill bit.

5. The long-pitch drill pipe for complex geological conditions according to claim 1, characterized in that: Two limiting protrusions are symmetrically fixed on the outer peripheral wall of each of the aforementioned connectors, and two limiting grooves are symmetrically opened on the inner peripheral wall of each of the aforementioned connector holes, which are respectively adapted to the two limiting protrusions.

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