CN212405121U

CN212405121U - Construction device for rotary digging screw pile

Info

Publication number: CN212405121U
Application number: CN202021467972.9U
Authority: CN
Inventors: 周广泉
Original assignee: Shandong Machinery Construction Co ltd
Current assignee: Shandong Machinery Construction Co ltd
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2021-01-26
Anticipated expiration: 2030-07-23

Abstract

Dig a stake side bearing capacity soon for the reinforcing, the utility model provides a dig screw thread stake construction equipment, the technical scheme of adoption as follows: the construction device for the rotary drilling of the threaded pile is characterized by comprising a drilling barrel, cutting blades arranged on two sides in the drilling barrel and a connecting rod device for driving the cutting blades to extend outwards, wherein a through hole for the cutting blades to extend out is formed in the drilling barrel; the rotary-digging threaded pile adopts the form of firstly drilling, then cutting the spiral groove and then pouring concrete to form the pile, thereby effectively enhancing the side bearing capacity of the foundation pile, being suitable for the threaded pile with large diameter and depth and obviously improving the construction cost and the efficiency.

Description

Construction device for rotary digging screw pile

Technical Field

The utility model relates to a building pile basis technical field, in particular to dig screw thread pile construction equipment soon.

Background

At present, the rotary excavating hole-forming friction type cast-in-place pile widely applied to the market generally adopts a post-grouting and expanding method to improve the bearing capacity of a foundation pile. The post-grouting technology aims to solidify sediment (loose soil) and mud cakes through post-grouting at the pile end and the pile side, reinforce soil bodies in a certain range around the pile end and the pile, improve the bearing capacity and quality of the pile and reduce pile foundation settlement. However, the process is complicated and the cost is high. The rotary digging pedestal pile is a new process developed in recent years, a special pedestal drill bit is utilized at the hole bottom, and the bearing capacity of the foundation pile is improved by enlarging the bearing area of the pile end. The existing pile-forming technology adopts a screw pile formed by squeezing soil, but the pile-forming diameter and the pile-forming depth are small, and the requirements of a foundation pile with large diameter, large depth and high bearing capacity cannot be met.

From the bearing mechanism analysis of the friction pile, the spiral groove is cut on the smooth hole wall, the bearing mechanism of the pile-soil interaction can be fundamentally changed, the friction force of the foundation pile can be calculated according to the outer diameter of the thread, the enhancement coefficient of 1.2 can be increased, and the friction bearing capacity of the pile side can be greatly improved on the premise of adding a small amount of plain concrete. For friction piles with the length of tens of meters widely adopted in the market at present, the cost performance is higher than that of post-grouting and diameter-expanding pile methods.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a dig screw pile construction equipment soon, the technical scheme of adoption as follows:

the construction device for the rotary drilling screw pile is characterized by comprising a drilling barrel, cutting blades arranged on two sides inside the drilling barrel and a connecting rod device used for driving the cutting blades to extend outwards, wherein a through hole used for extending the cutting blades is formed in the drilling barrel.

Preferably, the connecting rod device comprises a screw rod, a connecting nut coaxially connected with the screw rod through threads, a connecting rod, a fixed disk fixedly connected to the bottom of the drill cylinder, and a rotating disk rotatably connected below the fixed disk, the screw rod is distributed in the vertical direction, the lower part of the screw rod is fixedly connected with the rotating disk, the screw rod is rotatably connected with the fixed disk, one end of the connecting rod is hinged to the connecting nut, the other end of the connecting rod is hinged to the cutting blade, and a clamping plate is fixedly connected below the rotating disk.

Preferably, an annular groove is formed in the side surface of the lead screw above the fixed disc, and a clamping ring for limiting axial displacement of the lead screw is coaxially and fixedly connected in the annular groove.

The beneficial effects of the utility model reside in that:

1. the spiral groove cutting drill bit adopts a lead screw assembly and a connecting rod mechanism to drive the cutting blade to extend outwards, so that the cutting drill bit is in a retraction state in the process from the lower part to the bottom of a drill hole, the cutting blade is driven to extend outwards before the spiral groove is cut, and other influences on the inner wall of the drill hole are avoided;

2. the clamping ring limits the axial displacement of the screw rod, so that the fixed disc and the rotating disc are prevented from being separated;

3. the device can cut a thread structure on the side surface of the rotary excavating pile, enhances the bearing capacity of the side of the foundation pile, adopts the form of firstly drilling, then cutting a spiral groove and then pouring concrete to form the pile by the rotary excavating thread pile, is suitable for the thread pile with large diameter and depth, and obviously improves the construction cost and the efficiency.

Drawings

FIG. 1 is a schematic view of the structure of the present invention

FIG. 2 is a schematic view of a rotary excavating screw pile structure

The cutting tool comprises a connecting block, a drilling barrel, a fixing disc, a rotating disc, a lead screw, a nut, a connecting rod, a cutting blade, a clamping ring and a clamping plate, wherein the connecting block is 1-2-the drilling barrel, the fixing disc is 3-the rotating disc is 4-the lead screw is 5-the nut is 6-the connecting rod is 8-the cutting blade is 9-the clamping ring is.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to fig. 1-2. 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 only 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.

The rotary drilling screw pile construction device shown in figure 1 mainly comprises a drilling barrel 2, cutting blades 8 and a screw rod assembly, wherein the drilling barrel 2 is fixedly connected with a drill rod of a rotary drilling rig through a connecting block 1, the lower end of the drilling barrel 2 is fixedly connected with a fixed disc 3, a rotating disc 4 is coaxially and rotatably connected below the fixed disc 3, the screw rod assembly is arranged in the drilling barrel 2, a main body of a screw rod 5 penetrates through the rotating disc 4 and the fixed disc 3 from bottom to top and is positioned in the drilling barrel 2, the lower part of the screw rod 5 is connected with the rotating disc 4 in a welding manner, the screw rod 5 is rotatably connected with the fixed disc 5, the upper part of the screw rod 5 is coaxially and threadedly connected with a nut 6, the inner lower part of the drilling barrel 2 is also provided with the two symmetrically distributed cutting blades 8, the cutting blades 8 are positioned on the outer side and are horizontally distributed as a whole, the, the lower extreme links to each other with cutting blade 8 is articulated, and the lower part of the 2 surface of a drill section of thick bamboo still is provided with two symmetric distribution's through-hole for cutting blade 8 passes through when outwards stretching out, in addition, is provided with annular groove at 5 side surfaces of lead screw that lie in fixed disk 3 top, and coaxial fixedly connected with snap ring 9 in the annular groove, terminal surface and fixed disk 3 up end parallel and level under the snap ring 9, the up end and the annular groove up end parallel and level of snap ring 9 to the big external diameter with annular groove of snap ring 9 external diameter also greatly passes the diameter of the through-hole of fixed disk 4 department with 5 lower parts of lead screw simultaneously, in addition, at two cardboard 10 of below fixedly connected with of.

The whole device has the following working principle: after the drilling of the rotary drilling rig is finished, a drill bit with cutting blades 8 is replaced, the connecting block 1 is fixedly connected to the lower portion of a drill rod of the rotary drilling rig, the drill rod drives the drill cylinder to integrally descend to the bottom of a drill hole, the clamping plate 10 is inserted into the lower portion of a ground layer at the bottom of the drill hole at the moment, the drill rod is driven to drive the drill bit to rotate at the moment, the rotary disc 4 is fixedly connected with the rotary disc 4 through the clamping plate 10, therefore, relative displacement between the nut 4 and the screw rod 5 in the vertical position occurs, the nut 4 drives the two cutting blades 8 to move outwards, after the cutting blades 8 extend out of the drill cylinder 2 in an x1 mode, the drill rod is lifted and rotated at one side, the drill bit is driven to integrally.

The concrete construction steps are as follows:

1) firstly, positioning and paying off are carried out according to a pile arrangement diagram, a rotary drilling rig is positioned, and hole forming construction is carried out according to parameters of design requirements;

2) the rotary drilling rig is provided with the drill bit shown in the figure 1, and the drill bit is lowered to the bottom of the drill hole by the drill rod;

3) the drill rod drives the drill bit to press downwards, so that the clamping plate 10 is inserted into the subsoil, the drill rod continues to rotate, the cutting blades 8 are driven to extend out of the drill barrel 2 outwards, and the outer diameter of the two cutting blades 8 rotating around the drill rod is ensured to be larger than the inner diameter of a drilled hole;

4) the drill rod is lifted upwards while rotating, and the cutting blade 8 is driven to cut on the inner wall of the drill hole to form a spiral groove under the combined action of rotation and lifting of the drill rod;

5) and removing drilling slag at the bottom of the hole, replacing the slurry, installing a reinforcement cage, and pouring concrete to form the rotary-digging threaded pile shown in figure 2.

By the construction method, the rotary-digging threaded pile with large diameter and depth can be quickly and reliably formed, the bearing capacity of the foundation pile is obviously improved, and the construction method of drilling and then cutting the spiral groove is adopted, so that the construction cost can be effectively reduced, and the construction efficiency can be improved.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements can be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a dig screw pile construction equipment soon which characterized in that, including boring a section of thick bamboo, set up the cutting blade and be used for driving the connecting rod device that the cutting blade outwards stretches out of boring a section of thick bamboo inside both sides, it is provided with the through-hole that is used for the cutting blade to stretch out on the section of thick bamboo to bore.

2. The rotary excavating threaded pile construction device according to claim 1, wherein the connecting rod device comprises a lead screw, a connecting nut coaxially connected with the lead screw in a threaded manner, a connecting rod, a fixed disc fixedly connected with the bottom of the drilling barrel and a rotating disc rotatably connected below the fixed disc, the lead screw is distributed in the vertical direction, the lower portion of the lead screw is fixedly connected with the rotating disc and rotatably connected with the fixed disc, one end of the connecting rod is hinged with the connecting nut, the other end of the connecting rod is hinged with the cutting blade, and a clamping plate is fixedly connected below the rotating disc.

3. The rotary excavating threaded pile construction device according to claim 2, wherein an annular groove is formed in the side surface of the lead screw above the fixed disc, and a clamping ring for limiting axial displacement of the lead screw is coaxially and fixedly connected in the annular groove.