CN210460507U - Expanding drill bit for slurry wall protection rotary drilling pile - Google Patents

Abstract

In order to solve the problems that the initial angle of the existing rotary expansion drill bit is too small and needs larger initial pressure, the utility model provides an expanding drill bit for a slurry wall protection rotary drilling pile, which comprises a drill bit connecting block, an upper fixing plate, two upper expansion arms, two lower expansion arms, a lower fixing plate, a sliding sleeve, a sliding rod and a supporting plate, wherein the upper fixing plate is fixedly connected below the drill bit connecting block, the sliding sleeve is fixedly connected below the upper fixing plate, the sliding rod is coaxially and slidably connected below the inner part of the sliding sleeve, the supporting plate and the lower fixing plate can rotate relatively, the upper expansion arms and the lower expansion arms are both in an L-shaped structure, the two upper expansion arms positioned at the left side and the right side of the upper fixing plate are hinged with the upper fixing plate, the hinged joints are both positioned on the axis of the sliding rod, the two lower expansion arms are respectively hinged and connected at the left side and the right side below the two upper expansion arms, and the, and the lower parts of the two lower expanding arms are hinged with the lower fixing plate, and the hinged point of the lower expanding arms and the lower fixing plate is close to the axis where the sliding rod is located.

Description

Expanding drill bit for slurry wall protection rotary drilling pile

Technical Field

The utility model relates to a construction equipment technical field, in particular to an expanding drill bit that is used for mud dado to dig bored pile soon.

Background

The rotary drilling hole expanding drill bit adopted in the market at present is shown in figure 1 and comprises a drill bit connecting block, an upper cross beam, a lower cross beam, an upper expanding arm, a lower expanding arm, a sliding sleeve, a sliding rod and a supporting disk, wherein the drill bit connecting block is connected with a drill rod of the rotary drilling machine, the upper beam pushes the expanding arm to move downwards when the drill rod is pressed downwards, the middle hinge of the upper expanding arm and the lower expanding arm move axially towards two sides, the expanding arm is expanded, and the expanding arm can cut the hole wall to expand the hole wall when the drill rod rotates. The sliding sleeve and the sliding rod play roles in supporting and transmitting torque. The supporting disc is used for providing counter force for the expanding drill bit.

The drill bit has the following obvious disadvantages:

1. because the three shaft pins of the upper expanding arm and the lower expanding arm are on the same straight line and have no initial angle, when the expanding arms are pressed down by the drill rod, the component force of the expanding arms in the horizontal direction is small, the expanding is difficult to expand in hard soil, and larger axial pressure of the rotary drilling rod is needed.

2. The drill bit of each specification can only be used for the aperture of the same specification, can not realize the multi-purpose of one machine (drill), and has low utilization rate.

Disclosure of Invention

In order to solve the problem, the utility model provides a hole enlargement drill bit that is used for mud dado to dig bored pile soon, the technical scheme of adoption as follows:

an expanding drill bit for a slurry wall protection rotary drilling pile is characterized by comprising a drill bit connecting block, an upper fixing plate, two upper expanding arms, two lower expanding arms, a lower fixing plate, a sliding sleeve, a sliding rod and a supporting plate, wherein the upper fixing plate is fixedly connected below the drill bit connecting block, the sliding sleeve is fixedly connected below the upper fixing plate, the sliding rod is coaxially and slidably connected below the inner part of the sliding sleeve, the supporting plate is positioned below the lower fixing plate, the supporting plate and the sliding rod are coaxially distributed and can rotate relatively between the supporting plate and the fixing plate, the upper expanding arm and the lower expanding arms are both in an L-shaped structure, the two upper expanding arms positioned on the left side and the right side of the upper fixing plate are hinged with the upper fixing plate, hinge joints are both positioned on the axis of the sliding rod, the two lower expanding arms are respectively hinged and connected below the two upper expanding arms, and the two upper expanding arms and the two lower expanding arms form a square, and the lower parts of the two lower expanding arms are hinged with the lower fixing plate, and the hinged point of the lower expanding arms and the lower fixing plate is close to the axis where the sliding rod is located.

Preferably, a rotating shaft is fixedly connected to the lower portion of the lower fixing plate, the rotating shaft and the sliding rod are coaxially distributed, the supporting disc and the rotating shaft are coaxially and rotatably connected, and the outer diameter of the rotating shaft is the same as that of the grouting pipe.

Preferably, the under-expanded arms on the left side of the lower fixing plate are distributed in an L-shaped structure, the under-expanded arms on the right side of the lower fixing plate are distributed in a mirror image mode along the axis direction of the sliding rod, and the two upper expanded arms are distributed above the two under-expanded arms in a mirror image mode along the hinged joints of the up-expanded arms and the down-expanded arms.

The beneficial effects of the utility model reside in that:

1. the design of the L-shaped expanding arms is adopted, the upper hinge points of the two L-shaped expanding arms at the upper part are superposed, so that the hinge points of the two L-shaped expanding arms at the lower part are close to the central axis, a larger initial angle can be formed, the expanding tension of a drill bit is greatly improved, and the expanding device is suitable for expanding in a hard soil layer;

2. the L-shaped expanding arm is convenient to replace, multi-aperture expanding construction can be realized, one machine (drill) can be used for multiple purposes, and the utilization rate of the drill bit is improved;

3. the pile tail with the same aperture is reserved at the bottom of the pile end, so that the installation of a post-grouting pipe at the bottom of the pile is convenient, the post-grouting effect is enhanced, and the bearing capacity of the pile end is obviously improved;

4. the two wings of the drill bit are simple in design structure, clear in expanding principle, easy to operate, free of auxiliary equipment and capable of realizing expanding based on the cutting principle only by means of strong torque and drilling pressure of a drill rod of the rotary drilling rig, the expanding size of the expanded diameter is monitored by the descending distance of the drill rod according to the expanded diameter, the effect is reliable, the expanded shape is regular, the work efficiency is high, the speed is high, and large-area popularization is easy.

Drawings

FIG. 1 is a schematic view of a conventional rotary reaming bit

FIG. 2 is a schematic view of the structure of the present invention

In the figure, 1-a drill connecting block, 2-an upper fixing plate, 3-a sliding sleeve, 4-a sliding rod, 5-a first upper expanding arm, 6-a second upper expanding arm, 7-a first lower expanding arm, 8-a second lower expanding arm, 9-a lower fixing plate, 10-a supporting plate and 11-a rotating shaft.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

As shown in fig. 2, the expanding drill bit for the slurry wall protection rotary drilling pile mainly comprises a drill bit connecting block 1, an upper fixing plate 2, a sliding sleeve 3, a sliding rod 4, upper expanding arms 5 and 6, lower expanding arms 7 and 8, a lower fixing plate 9, a rotating shaft 11 and a supporting plate 10, wherein the drill bit connecting block 1, the upper fixing plate 2, the sliding sleeve 3, the sliding rod 4, the lower fixing plate 9, the rotating shaft 11 and the supporting plate 10 are distributed from top to bottom, the upper fixing plate 2 is fixedly connected below the drill bit connecting block 1, the sliding sleeve 3 is fixedly connected below the middle part of the upper fixing plate 2, the sliding rod 4 is coaxially and slidably connected inside the sliding sleeve 3, the sliding rod 4 is fixedly connected with the lower fixing plate 9, the rotating shaft 11 is welded below the lower fixing plate 9, the rotating shaft 11 and the sliding rod 4 are coaxially distributed, the lower end of the rotating shaft 11 is coaxially and rotatably connected with the supporting plate 10, the supporting plate 10 is rotatably connected with the rotating shaft, the upper expanding arm comprises a first upper expanding arm 5 and a second upper expanding arm 6 which are hinged to the left side and the right side of the upper fixing plate 2 respectively, hinge points of the first upper expanding arm 5 and the second upper expanding arm 6 and the upper fixing plate 2 are overlapped and are located in the middle of the upper fixing plate 2, namely the axis where the sliding sleeve 3 and the sliding rod 4 are located, the lower expanding arm comprises a first lower expanding arm 7 and a second lower expanding arm 8 which are hinged to the left side and the right side of the lower fixing plate 2 respectively, and the hinge points of the first lower expanding arm 7 and the second lower expanding arm 8 and the lower fixing plate 9 are close to the axis where the sliding rod 4 is located.

The first downward-expanding arms 7 are distributed in an L-shaped structure, the second downward-expanding arms 8 are distributed on the right side of the sliding rod 4 along the axis of the sliding rod 4 in a mirror image mode, the upper ends of the first downward-expanding arms 7 are hinged with the lower ends of the first upward-expanding arms 5, the upper portions of the second downward-expanding arms 8 are hinged with the lower ends of the second upward-expanding arms 6, the hinge points of the two groups of upward-expanding arms and the lower arms are located on the same horizontal plane, the first upward-expanding arms 5 and the second upward-expanding arms 6 are distributed with the first downward-expanding arms 7 and the second downward-expanding arms 8 in a mirror image mode along the straight lines where the hinge points of the upward-expanding arms and the lower arms are located, and the first upward-expanding arms 5, the second upward-expanding arms.

When the device is constructed, the sliding sleeve 3 slides downwards along the sliding rod 4 after the drill rod of the rotary excavating machine is pressed downwards, the upper fixing plate 2 moves downwards under the driving of the sliding sleeve 3, the upper expanding arm and the upper fixing plate 2 rotate at the moment, the upper expanding arm and the lower expanding arm expand outwards simultaneously, and then the whole device is driven to rotate, so that the upper expanding arm and the lower expanding arm cut the hole wall.

When the device is used for cast-in-place pile construction, the concrete operation steps are as follows:

① after the hole is drilled by a rotary drill, the hole-expanding drill bit is replaced at the position needing hole expansion;

② when the drill reaches the depth of the soil layer to be expanded, the drill rod of the rotary excavating machine is pressed down to expand the L-shaped expansion arm of the expanding drill bit and drive the drill rod to rotate to cut the hole wall;

③, after observing that the vertical stroke of the rotary drilling rod reaches a preset distance, continuing spinning for 3-5 circles, and lifting the drill bit out of the drill hole;

④ if the diameter of the pile hole bottom is expanded, the bottom cleaning barrel drill needs to be replaced to carry out bottom cleaning operation;

⑤ after the drilling depth and the hole bottom sediment meet the requirements, the pile forming is finished by installing the reinforcement cage and the conduit and pouring the concrete.

It is right with concrete construction project below the utility model discloses carry out more detailed explanation, be convenient for carry out more complete understanding to whole scheme:

a light A03 plot project of the Ten-thousand-year-old Jinan is located in the Ji-Yang region of Jinan City, and 6 high-rise buildings with 32-34 floors are planned. According to the geotechnical engineering survey report, the proposed site stratum can be divided into 10 large layers and sub-layers thereof according to the deposition age and engineering properties: the 2 nd to 5 th layers on the upper part are the complete new system (Q)₄) Silt, cohesive soil and sandy soil with alluvial formation are relatively near to the deposition age, have relatively low foundation bearing capacity and moderate to high compressibility and can be used as a foundation bearing layer of a common building; the 6 th to 8 th layers in the middle part are cohesive soil, silt and sandy soil which cause flood accumulation, the cohesive soil can be hard plastic, the silt and the sandy soil are medium density to dense, the soil property is good, and the compressibility is medium; the 9 th to 10 th layers at the lower part are cohesive soil, silt and sandy soil which cause flood accumulation, the cohesive soil can be hard plastic, the silt and the sandy soil are medium dense and dense, the soil has good properties and medium and low compressibility, and can be used as a pile foundation bearing layer.

A rotary excavating bottom expanding post-grouting new construction method is adopted, the pile length is 45m, the pile diameter is 700mm, the diameter of an expanded head is 1.4m, a pile end bearing layer is a 9 th layer, and the vertical compression-resistant limit bearing capacity of a single pile is 7900 kN. And (5) completing the static load test work of the test pile at the bottom of 2019 and meeting the design requirement of the test pile result. After obtaining the data of bottom-expanding post-grouting pile test, the total number of 6 high-rise piles of the Jinan Wanke Shishao A03 plot project is 1023, the device is adopted for construction, the rotary-expanding drill bit has a larger initial angle when in use, the hole-expanding tension of the drill bit is improved, the design structure of two wings of the drill bit is simple, the hole-expanding principle is clear, the operation is easy, auxiliary equipment is not needed, the hole-expanding of the cutting principle can be realized only by means of strong torque and drilling pressure of a drill rod of a rotary drilling rig, the hole-expanding size is monitored by the descending distance of the drill rod according to the diameter-expanding diameter, the effect is reliable, and the hole-expanding shape is regular.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims (3)

1. An expanding drill bit for a slurry wall protection rotary drilling pile is characterized by comprising a drill bit connecting block, an upper fixing plate, two upper expanding arms, two lower expanding arms, a lower fixing plate, a sliding sleeve, a sliding rod and a supporting plate, wherein the upper fixing plate is fixedly connected below the drill bit connecting block, the sliding sleeve is fixedly connected below the upper fixing plate, the sliding rod is coaxially and slidably connected below the inner part of the sliding sleeve, the supporting plate is positioned below the lower fixing plate, the supporting plate and the sliding rod are coaxially distributed and can rotate relatively between the supporting plate and the fixing plate, the upper expanding arm and the lower expanding arms are both in an L-shaped structure, the two upper expanding arms positioned on the left side and the right side of the upper fixing plate are hinged with the upper fixing plate, hinge joints are both positioned on the axis of the sliding rod, the two lower expanding arms are respectively hinged and connected below the two upper expanding arms, and the two upper expanding arms and the two lower expanding arms are distributed in, and the lower parts of the two lower expanding arms are hinged with the lower fixing plate, and the hinged point of the lower expanding arms and the lower fixing plate is close to the axis where the sliding rod is located.

2. The expanding drill bit for the mud-protecting wall rotary drilling pile according to claim 1, wherein the fixing plate is fixedly connected below a rotating shaft, the rotating shaft and the sliding rod are coaxially distributed, a supporting disc is coaxially and rotatably connected with the rotating shaft, and the outer diameter of the rotating shaft is the same as that of a grouting pipe.

3. The expanding drill bit for the mud-protecting wall rotary drilling pile according to claim 1 or 2, wherein the lower expanding arms on the left side of the lower fixing plate are distributed in an L-shaped structure, the lower expanding arms on the right side of the lower fixing plate are distributed in a mirror image mode along the axial direction of the sliding rod, and the two upper expanding arms are distributed above the two lower expanding arms in a mirror image mode along the hinge point of the upper expanding arms and the lower expanding arms.

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