Full-rotation full-casing pile pulling drill bit

Abstract

The utility model discloses a full-rotation full-casing drill bit for pile pulling, and relates to the technical field of cast-in-place pile pulling. The full-rotation and full-casing drill bit for pile pulling comprises a drill bit body, the drill bit body is of a cylindrical structure matched with an obstacle pile in shape, and the two ends of the interior of the drill bit body penetrate through the drill bit body; a connecting structure is arranged on the side wall of one end of the drill bit body and used for being connected with a sleeve extending the drill bit body. A plurality of cutters are arranged at the end part of the other end of the drill bit body, and cutter heads of the cutters are arranged along the tangential direction of the drill bit body. The drill bit body is matched with the obstacle pile in shape, the drill bit body can be arranged on the outer side of the obstacle pile in a sleeving mode, and then a reinforced concrete bearing platform is cut and the obstacle pile is pulled out through the reinforced concrete cutting capacity of the cutters installed at the bottom of the drill bit body. And meanwhile, the pile hole is backfilled through the through hole in the drill bit body, the influence on the surrounding environment is reduced, and meanwhile the influence on operation of the shield tunneling machine can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a full-rotation full-casing pile pulling drill bit. Background Art

[0002] With the development of urban economy and construction, the pressure on urban ground transportation is increasing, and the contradictions such as traffic congestion and travel difficulties are becoming increasingly prominent. The development of urban rail transit has become an inevitable choice to solve this contradiction. During the underground crossing construction of the subway shield section, it is inevitable to encounter pile foundation projects left by abandoned buildings (structures) on the ground. These pile foundation projects have become a major obstacle to the subway shield crossing construction, especially the steel structure inside, which is catastrophic to the shield. They may cause damage to the shield machine cutter head and work failure of the screw conveyor; therefore, they must be removed before the shield crossing construction to ensure the safe crossing of the shield machine and the smooth progress of the subway construction. Utility Model Content

[0003] To this end, the embodiment of the utility model provides a full-rotation full-casing pile extraction drill bit to solve the problems existing in the above-mentioned technology.

[0004] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0005] A full-rotation full-casing pile-pulling drill bit comprises a drill bit body, wherein the drill bit body is a cylindrical tube structure adapted to the shape of the obstacle pile, and the inside of the drill bit body is penetrated by two ends;

[0006] A connecting structure is provided on the side wall of one end of the drill body, for connecting a casing extending the drill body;

[0007] A plurality of cutters are arranged on the end of the other end of the drill body, the cutter heads of the cutters are arranged along the tangent direction of the drill body, and the cutters are fixedly connected to the drill bit.

[0008] Optionally, the diameter of the drill body is 1500 mm and the wall thickness is 30 mm.

[0009] Optionally, a plurality of said tool circular arrays are distributed on the end face of said drill body.

[0010] Optionally, 21 cutting tools are provided.

[0011] Optionally, the connection structure on the drill body is a connection hole opened on the side wall of the drill body, and the drill body and the extension sleeve are fixed in the connection hole by bolt connection.

[0012] Optionally, the fixed connection between the tool and the drill body is a detachable fixed connection.

[0013] Optionally, a mounting groove corresponding to the tool is provided on the drill body, a mounting seat is fixedly installed in the mounting groove, and the tool is mounted on the mounting seat by a bolt assembly.

[0014] Optionally, the mounting seat and the drill bit body are fixed by welding.

[0015] The utility model has at least the following beneficial effects:

[0016] The utility model arranges a drill body to match the shape of the obstacle pile, and the drill body can be sleeved on the outside of the obstacle pile. Then, a plurality of cutters installed at the bottom of the drill body can cut the reinforced concrete cap through the ability of the cutters to cut reinforced concrete, and the obstacle pile can be removed. At the same time, the pile hole can be backfilled through the internal through hole of the drill body, thereby reducing the impact on the surrounding environment and avoiding affecting the operation of the shield machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly explain the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the present invention. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other drawings can be derived from the provided drawings without creative work.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model from a first viewing angle;

[0020] Figure 2 This is a schematic diagram of a tool splitting structure according to an embodiment of the utility model;

[0021] Figure 3 The figure is a schematic diagram of a tool installation structure according to an embodiment of the utility model.

[0022] Description of reference numerals:

[0023] 1. Drill body; 2. Cutting tool; 3. Connecting hole; 4. Mounting slot; 5. Mounting seat; 6. Bolt assembly. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] In the description of the present invention, unless otherwise specified, "plurality" means two or more. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are intended to distinguish the objects referred to. For schemes with a sequential flow, this terminology does not have to be understood as describing a specific order or sequence. For schemes with device structures, this terminology does not distinguish between importance, positional relationships, etc.

[0026] In addition, the terms "comprises", "has" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that have been explicitly listed, but may also include other steps or units that are not explicitly listed but are inherent to these processes, methods, products or apparatuses, or steps or units that are added based on further optimization schemes conceived by the present invention.

[0027] like Figure 1 and Figure 2 As shown, a full-rotation full-casing pile pulling drill disclosed in the utility model comprises a drill body 1, wherein the drill body 1 is a cylindrical structure adapted to the shape of the obstacle pile, and the drill body 1 is penetrated by two ends;

[0028] A connecting structure is provided on the side wall of one end of the drill body 1, for connecting a casing extending the drill body 1;

[0029] A plurality of cutters 2 are arranged on the other end of the drill body 1 , and the cutter heads of the cutters 2 are arranged along the tangent direction of the drill body 1 , and the cutters 2 are fixedly connected to the drill bit.

[0030] The drill body 1 is a steel casing structure, which can be put on the obstacle pile. The drill body 1 is driven by a full-rotation device to rotate in circles to drill the drill into the ground. The cutter 2 is a high-strength alloy cutter head, which is fixedly installed at one end of the steel casing to cut obstacles such as soil and concrete. The casing of the drill body 1 is drilled into the ground to 1m below the pile bottom, and the soil and obstacles around the old pile are cut to separate the soil.

[0031] The steel casing is drilled into the center of the pile in advance, and the full-rotation equipment drives the casing to be pressed concentrically with the pre-pulled pile. The rotation torque and rotation speed of the casing can be adjusted according to the geological and obstacle conditions. After the steel casing drill bit encounters the cap, it cuts the reinforced concrete structure of the cap at a uniform speed to prevent excessive torque or too fast speed, which increases the resistance of the cutter head, reduces construction efficiency, and increases the risk of drill jamming.

[0032] During the casing drilling process of the drill bit body 1, the pile body may be twisted or damaged at an uncertain position due to soil disturbance. By utilizing the wall protection function of the casing, a crane can be used in conjunction with a grab bucket to directly pull out the twisted reinforced concrete pile on the upper part first, and then the soil in the pipe is taken out, and the next section of the pile body is lifted and pulled out until it is cleared to the predetermined pile bottom elevation.

[0033] The drill bit body 1 is a cylindrical structure with two ends penetrating therethrough, so as to simultaneously backfill the pile hole when pulling out the casing;

[0034] After the hole is cleaned and the original soil is dug out, the backfilling construction in the drill bit is carried out. The backfilling is carried out with mortar, and the mortar strength is controlled at M2 or below. In order to avoid the occurrence of collapse, the backfilling operation is carried out simultaneously with the extraction of the drill bit, that is, before the drill bit is officially extracted, a certain height of mortar is first backfilled in the drill bit, and then the drill bit is backfilled while being pulled out, and the mortar surface in the drill bit is always kept higher than a certain height from the bottom of the drill bit until the last section of the casing is pulled out, and finally backfilled to the ground elevation. If there is a void in the existing pile position after the pile is pulled out, grouting is used to supplement it to ensure that the shield construction will not cause settlement of the surface and surrounding structures.

[0035] The drill body 1 has a diameter of 1500 mm and a wall thickness of 30 mm.

[0036] The steel casing is selected with a diameter of 1500mm and a wall thickness of 30mm; and a 20-ton crawler crane is equipped to assist in the installation and removal of steel casing and pile removal.

[0037] A plurality of the cutters 2 are distributed in a circular array on the end surface of the drill body 1 .

[0038] There are 21 cutting tools 2 .

[0039] The drill body 1 is provided with a mounting groove 4 at the bottom of a steel casing, and alloy cutting teeth are selected as the cutting platform tool 2, which is fixed to the bottom of the steel casing by welding.

[0040] The connection structure on the drill body 1 is a connection hole 3 opened on the side wall of the drill body 1 , and the drill body 1 and the extension sleeve are fixed in the connection hole 3 by bolt connection.

[0041] The connecting hole is used to connect the extended casing. By connecting the extended casing to the drill bit, the drilling depth can be increased.

[0042] like Figure 1-Figure 3 As shown, in a further embodiment, the fixed connection between the cutter 2 and the drill body 1 is a detachable fixed connection.

[0043] The drill body 1 is provided with a mounting groove 4 corresponding to the tool 2 , a mounting seat 5 is fixedly installed in the mounting groove 4 , and the tool 2 is mounted on the mounting seat 5 via a bolt assembly 6 .

[0044] The mounting seat 5 is fixed to the drill body 1 by welding.

[0045] By providing the tool 2 with a corresponding mounting groove 4 structure and detachably connecting the tool 2 to the mounting groove 4, a targeted replacement can be performed when a single tool 2 is damaged or severely worn, without replacing the entire drill bit.

[0046] The above specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0047] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0048] The above is a relatively specific and detailed description of the utility model through general description and specific embodiments. It should be pointed out that, without departing from the concept of the utility model, it is obvious that several variations and improvements can be made to these specific embodiments, which all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application shall be based on the attached claims.

Claims

1. A full-rotation, full-casing pile extraction drill bit, characterized in that: It includes a drill body, which is a cylindrical structure adapted to the shape of the obstacle pile, and the inside of the drill body is penetrated by two ends; A connecting structure is provided on the side wall of one end of the drill body, for connecting a casing extending the drill body; A plurality of cutters are arranged on the end of the other end of the drill body, the cutter heads of the cutters are arranged along the tangent direction of the drill body, and the cutters are fixedly connected to the drill bit.

2. A full-rotation full-casing pile extraction drill bit according to claim 1, characterized in that: The diameter of the drill body is 1500 mm and the wall thickness is 30 mm.

3. The full-rotation full-casing pile extraction drill bit according to claim 1, characterized in that: A plurality of circular arrays of cutters are distributed on the end surface of the drill body.

4. The full-rotation full-casing pile extraction drill bit according to claim 3, characterized in that: There are 21 cutting tools.

5. The full-rotation full-casing pile extraction drill bit according to claim 1, characterized in that: The connection structure on the drill body is a connection hole opened on the side wall of the drill body, and the drill body and the extension sleeve are fixed in the connection hole by bolt connection.

6. The full-rotation full-casing pile extraction drill bit according to claim 1, characterized in that: The fixed connection between the cutter and the drill body is a detachable fixed connection.

7. A full-rotation full-casing pile extraction drill bit according to claim 6, characterized in that: The drill body is provided with a mounting groove corresponding to the tool, a mounting seat is fixedly installed in the mounting groove, and the tool is mounted on the mounting seat through a bolt assembly.

8. The full-rotation full-casing pile extraction drill bit according to claim 7, characterized in that: The mounting seat and the drill body are welded and fixed.

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