Novel underreaming drill bit for pile foundation

Abstract

The utility model relates to the technical field of pile foundation construction equipment, and discloses a novel underreaming drill bit for a pile foundation, which comprises a top disc, a bottom disc, a support disc and four underreaming drill toothed bars circularly distributed at equal intervals, the underreaming drill toothed bars are movably hinged to the bottom end of the top disc, a connecting rod is movably hinged between the bottom disc and the underreaming drill toothed bars, and the connecting rod is connected with the support disc. A sleeve seat is fixedly connected to the middle of the bottom of the top disc, a stand column is fixedly installed in the middle of the upper end of the bottom disc, the sleeve seat slidably sleeves the outer portion of the upper end of the stand column, a rotating shaft is fixedly connected to the middle of the bottom of the bottom disc, and the supporting disc is rotationally connected to the bottom end of the rotating shaft through a bearing seat. The bottom end of the supporting disc is fixedly connected with a plurality of guide rods at intervals, the outer portions of the bottom ends of the guide rods are sleeved with positioning sleeve rods in a sliding mode, the stable supporting and positioning effect can be achieved, the situation that the underreaming drill bit is prone to deviation is effectively prevented, and the stability of the hole reaming operation of the underreaming drill bit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundation construction equipment, and more specifically, to a novel bottom-enlarging drill bit for pile foundations. Background Art

[0002] A pile foundation is a deep foundation consisting of a pile and a pile cap connected to the top of the pile, or a single pile foundation connected to the pile foundation by a column. If the pile body is completely buried in the soil and the bottom surface of the cap is in contact with the soil, it is called a low cap pile foundation; if the upper part of the pile body is exposed to the bottom and the bottom of the cap is located above the bottom, it is called a high cap pile foundation. Building pile foundations are usually low cap pile foundations. During the construction of building pile foundations, a bottom expansion drill bit is usually used to expand the pile hole. During the use of existing pile foundation bottom expansion drill bits, since most of them are supported only by the chassis, the support and positioning effect they produce is poor, and the bottom expansion drill bit is prone to offset, affecting the stability of the bottom expansion drill bit's expansion operation. Based on this, the utility model designs a new type of pile foundation bottom expansion drill bit to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to provide a novel bottom expansion drill bit for pile foundation, so as to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] The cam is fixedly mounted on the support frame, and the cam is secured to the bottom of the base with respect to the support frame, and the cam is secured to the bottom of the base with respect to the support frame.

[0006] As a preferred technical solution of the present invention, the exterior of the column is fixedly sleeved with a limit block, and the limit block is located directly below the sleeve.

[0007] As a preferred technical solution of the present invention, a protective tube is fixedly installed on the upper end of the support plate on the outer side of the bearing seat, and the rotating shaft movably passes through the top of the protective tube.

[0008] As a preferred technical solution of the present invention, the number of the guide rods is four, and the four guide rods are distributed in a circular shape with equal intervals.

[0009] As a preferred technical solution of the present invention, the outer diameter of the positioning sleeve is the same as the diameter of the upper end surface of the tapered block.

[0010] As a preferred technical solution of the present invention, a connecting square box is fixedly connected to the middle of the upper end of the top plate, and a reinforced side seat is fixedly connected between the top plate and the connecting square box.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] The utility model discloses that when the sleeve is lowered along the column, the connecting rod can drive the reaming drill tooth rod to the reaming state, and the chassis can rotate above the support plate. When the chassis rotates with the column, the support plate can be in a stationary state on the bottom of the pile hole, thereby reducing the resistance encountered during the reaming operation. The sleeve squeezes the chassis and the support plate downward, so that the positioning sleeve rod and the pointed cone block are inserted into the bottom of the pile hole, the spring contracts, and the support plate is used to completely press each positioning sleeve rod into the bottom of the pile hole. At this time, the support plate is placed on the bottom of the pile hole for support. If the soil layer at the bottom of the pile hole is loose, the spring can be used to drive the positioning sleeve rod and the pointed cone block to further penetrate into the bottom of the pile hole, thereby producing a stable support and positioning effect, effectively preventing the bottom reaming drill bit from easily deviating and improving the reaming operation stability of the bottom reaming drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of a new type of bottom-enlarged drill bit for pile foundations in the present utility model;

[0014] Figure 2 This is a schematic cross-sectional view of a new type of bottom-enlarged drill bit for pile foundations according to the present invention;

[0015] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of part A;

[0016] Figure 4 The utility model is a schematic diagram of the top view of a new type of bottom expansion drill bit for pile foundation.

[0017] In the figure: 1. Top plate; 101. Sleeve; 102. Connecting square box; 103. Reinforced side seat; 2. Chassis; 201. Column; 202. Rotating shaft; 203. Limit block; 3. Support plate; 301. Bearing seat; 4. Reaming drill gear rod; 5. Connecting rod; 6. Guide rod; 7. Positioning sleeve rod; 701. Conical block; 702. Spring; 8. Protective tube. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figures 1 to 4 As shown, the utility model provides a new type of bottom reaming drill bit for pile foundation, comprising a top plate 1, a bottom plate 2, a support plate 3 and four reaming drill tooth rods 4 distributed in a circular shape with equal intervals. The reaming drill tooth rods 4 are movably hinged to the bottom end of the top plate 1, and a connecting rod 5 is movably hinged between the bottom plate 2 and the reaming drill tooth rods 4. A sleeve 101 is fixedly connected to the middle of the bottom of the top plate 1, and a column 201 is fixedly installed in the middle of the upper end of the bottom plate 2. When the sleeve 101 descends along the column 201, the connecting rod 5 can be used to drive the reaming drill tooth rods 4 to move to the reaming state. The sleeve 101 is slidably sleeved on the outer part of the upper end of the column 201, and a rotating shaft 202 is fixedly connected to the middle of the bottom of the bottom plate 2. The support plate 3 rotates through the bearing seat 301. It is connected to the bottom end of the rotating shaft 202, so that when the chassis 2 rotates with the column 201, the support plate 3 can be in a stationary state on the bottom of the pile hole. A number of guide rods 6 are fixedly connected to the bottom end of the support plate 3 at intervals. A positioning sleeve rod 7 is slidably sleeved on the outside of the bottom end of the guide rod 6. The bottom end of the positioning sleeve rod 7 is fixedly connected to a pointed cone block 701. A spring 702 is fixedly connected between the guide rod 6 and the pointed cone block 701. The chassis 2 and the support plate 3 are squeezed downward by the sleeve 101, so that the positioning sleeve rod 7 and the pointed cone block 701 are inserted into the bottom of the pile hole. The spring 702 contracts, and the support plate 3 is used to completely press each positioning sleeve rod 7 into the bottom of the pile hole. At this time, the support plate 3 is placed on the bottom of the pile hole for support.

[0020] Among them, Figure 2 As shown, the outer portion of the column 201 is fixedly sleeved with a limit block 203, which is located directly below the sleeve 101. If the sleeve 101 descends to the lowest point along the column 201, the limit block 203 can provide a good auxiliary limit blocking effect for the sleeve 101.

[0021] Among them, Figure 2 As shown, a protective tube 8 is fixedly installed on the outer side of the bearing seat 301 at the upper end of the support plate 3, and the rotating shaft 202 movably passes through the top of the protective tube 8, so that the protective tube 8 can seal and protect the bearing seat 301 on the support plate 3.

[0022] Among them, Figure 1 As shown, there are four guide rods 6 , and the four guide rods 6 are distributed in a circular shape with equal intervals.

[0023] Among them, Figure 3As shown, the outer diameter of the positioning sleeve 7 is the same as the diameter of the upper end surface of the tapered block 701, so that the positioning sleeve 7 and the tapered block 701 can be smoothly inserted downward into the bottom of the pile hole.

[0024] Among them, Figure 2 and Figure 4 As shown, a connecting box 102 is fixedly connected to the middle of the upper end of the top plate 1. The top plate 1 can be connected to the driving end of the rotary drilling equipment through the connecting box 102, so that the top plate 1 and the column 201 can be driven to rise and fall. A reinforced side seat 103 is fixedly connected between the top plate 1 and the connecting box 102 to ensure the structural strength of the connection between the top plate 1 and the connecting box 102.

[0025] The working principle of this utility model:

[0026] When the bottom drill bit is in the bottom position, the spring 702 can be used to drive the positioning sleeve 7 and the pointed cone block 701 to be inserted into the bottom of the pile hole, thereby reducing the resistance encountered during the hole expansion operation.

[0027] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of bottom expansion drill bit for pile foundation, characterized by: It comprises a top plate (1), a bottom plate (2), a support plate (3) and four reaming drill teeth (4) distributed in a circular and equidistant manner; The reaming drill tooth rod (4) is movably hinged to the bottom end of the top plate (1); a connecting rod (5) is movably hinged between the bottom plate (2) and the reaming drill tooth rod (4); a sleeve (101) is fixedly connected to the middle of the bottom of the top plate (1); a column (201) is fixedly installed in the middle of the upper end of the bottom plate (2); the sleeve (101) is slidably sleeved on the outer portion of the upper end of the column (201); a rotating shaft (202) is fixedly connected to the middle of the bottom of the bottom plate (2); and the supporting plate (3) is rotatably connected to the bottom end of the rotating shaft (202) through a bearing seat (301); The bottom end of the support plate (3) is fixedly connected to a plurality of guide rods (6) at intervals, the bottom end of the guide rod (6) is externally slidably sleeved with a positioning sleeve rod (7), the bottom end of the positioning sleeve rod (7) is fixedly connected to a pointed cone block (701), and a spring (702) is fixedly connected between the guide rod (6) and the pointed cone block (701).

2. A new type of pile foundation bottom expansion drill bit according to claim 1, characterized in that: The exterior of the column (201) is fixedly sleeved with a limit stopper (203), and the limit stopper (203) is located directly below the sleeve (101).

3. The novel bottom expansion drill bit for pile foundation according to claim 1, characterized in that: The upper end of the support plate (3) is located outside the bearing seat (301) and is fixedly mounted with a protective tube (8), and the rotating shaft (202) movably passes through the top of the protective tube (8).

4. The novel bottom expansion drill bit for pile foundation according to claim 1, characterized in that: The number of the guide rods (6) is four, and the four guide rods (6) are distributed in a circular manner with equal intervals.

5. The novel bottom expansion drill bit for pile foundation according to claim 1, characterized in that: The outer diameter of the positioning sleeve (7) is the same as the diameter of the upper end surface of the pointed cone block (701).

6. The novel bottom expansion drill bit for pile foundation according to claim 1, characterized in that: A connecting square box (102) is fixedly connected to the middle of the upper end of the top plate (1), and a reinforced side seat (103) is fixedly connected between the top plate (1) and the connecting square box (102).

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