Device suitable for re-stirring cement soil around grouting type spiral pile and construction method

Abstract

The invention discloses a device suitable for re-stirring cement soil around a grouting type spiral pile and a construction method. The meshed spiral pile comprises a spiral drill bit and a meshed spiral pile body, and the spiral drill bit is arranged at the bottom of the meshed spiral pile body; a grouting hole is formed in a pile body of the meshing tooth spiral pile, and sawtooth-shaped meshing teeth distributed in the length direction of the pile body are arranged on the two sides of the pile body of the meshing tooth spiral pile; the meshing tooth lifting stirrer is a hollow cylindrical mechanical device internally provided with symmetrical gears and is connected to the outer side of the meshing tooth screw pile in a sleeving mode, and sawtooth-shaped meshing teeth on the two sides of a pile body are mechanically meshed with the symmetrical gear mechanical device arranged in the meshing tooth lifting stirrer together, so that the meshing tooth lifting stirrer can move up and down along the pile body of the meshing tooth screw pile. The meshed screw pile adopted by the invention is simple to manufacture and low in material consumption; the construction method for re-stirring the slurry-soil mixture by using the novel grinding tooth lifting stirrer is simple and convenient to operate, and the output power of the stirrer can be adjusted according to actual conditions to form cement soil meeting the actual conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering pile foundations, and in particular relates to a device and a construction method suitable for remixing cement soil around a grouting type spiral pile. Background Art

[0002] A pile is a vertical or inclined foundation member set in the soil. Its function is to pass through soft, highly compressible soil or water, and transfer the load borne by the pile to a harder, denser or less compressible foundation bearing layer. The steel pipe spiral pile is a pile foundation composed of a central steel shaft and multiple spiral blades welded along the shaft. Compared with other pile foundations, it has the advantages of high bearing capacity and short construction period, and is considered to be a pile foundation with development potential. The pressure grouting steel pipe spiral pile combines the grouting process with the steel pipe spiral pile type. The spiral pile is grouted synchronously during the downward pressure and rotation process. The spiral blades force the soil and cement slurry to mix to form a cement soil with a certain strength, so that it is wrapped with the pile body to form a whole, increasing the pile body diameter and improving the overall stiffness and bearing capacity of the spiral pile.

[0003] A large amount of marine soft soil is widely distributed in the eastern coastal areas. Its low strength, large compression deformation, poor stability and seismic resistance have brought huge challenges to various engineering construction projects and are also the main factor causing various engineering accidents.

[0004] As a type of foundation, pressure grouting spiral piles have solved the problem of insufficient bearing capacity of traditional steel pipe spiral piles in marine soft soil areas. However, when constructing in harder soil layers, the cement slurry cannot be fully mixed with the surrounding soil to form a stable cement soil, and it is impossible to form a cement soil pile body with integrity, water stability and a certain strength, and the bearing capacity is difficult to guarantee. How to fully mix the cement slurry with the surrounding soil so that the bearing performance of the pile body can be guaranteed after the pile is formed, improve the durability of the pile body, ensure the construction quality, improve the construction efficiency, and reduce the use cost are the urgent problems to be solved for this type of pile. In view of this, it is necessary to propose a construction method for re-mixing the slurry-soil mixture using a new mixer after grouting the spiral pile. Summary of the invention

[0005] The present invention aims to provide a construction method for remixing the slurry-soil mixture using a new type of mixer after grouting the spiral pile, so as to solve the problems raised in the background technology.

[0006] In order to achieve the purpose of the present invention, the present invention discloses a device suitable for re-mixing cement soil around a grouting screw pile, comprising a meshing screw pile and a meshing lifting mixer; the meshing screw pile comprises a spiral drill bit and a meshing screw pile body, the spiral drill bit is arranged at the bottom of the meshing screw pile body; the meshing screw pile body is provided with grouting holes, and both sides of the meshing screw pile body are provided with sawtooth-type meshing teeth distributed along the length of the pile body; the meshing lifting mixer is a hollow cylindrical mechanical device with built-in symmetrical gears, which is sleeved on the outside of the meshing screw pile, and the sawtooth-type meshing teeth on both sides of the pile body are mechanically engaged with the built-in symmetrical gear mechanical device of the meshing lifting mixer, so that the meshing lifting mixer can move up and down along the meshing screw pile body.

[0007] Furthermore, spiral blades are arranged on the outside of the pile body of the toothed screw pile.

[0008] Furthermore, there are two grouting holes which are symmetrically distributed on both sides of the toothed screw pile body.

[0009] Furthermore, a plurality of stirring blades are arranged on the outer side of the meshing lifting mixer.

[0010] Furthermore, the meshing lifting mixer includes a mixing blade, a lower port, an upper port and a slide rail. The mixing blade is a long iron sheet, symmetrically welded to both sides of the slide rail; the lower port and the upper port are both cylindrical, welded to the upper and lower ends of the mixer; the slide rail is a cylinder sleeved on the outer surface of the mixer, and is connected to the internal drive motor of the mixer by bolts.

[0011] Furthermore, a drive motor is provided inside both sides of the mesh lifting mixer. The drive motor is a rechargeable drive motor with a built-in battery. The drive motor is a three-phase asynchronous motor, including a stator and a rotor. The upper port and the lower port are both provided with a stator and a rotor. The three-phase winding of the stator generates a rotating magnetic field. The rotor is a squirrel cage structure without a brush. The electromagnetic induction drives the slide rail to rotate, thereby driving the mixing blade to rotate. The drive motor battery is a lithium battery, and the battery is charged and discharged through chemical reactions.

[0012] Furthermore, the outer shell of the rodent lifting mixer is made of iron and a layer of paint is sprayed on the surface of the iron outer shell; the electronic instruments and batteries in the rodent lifting mixer are provided with waterproof measures such as thickened outer shells and waterproof materials such as sprayed paint.

[0013] Furthermore, a layer of anti-corrosion coating is sprayed on the surface of the toothed screw pile.

[0014] In order to achieve the purpose of the present invention, the present invention also discloses a construction method suitable for cement-soil remixing around a grouting screw pile, comprising the following steps:

[0015] S1. Level the site and leave enough space to accommodate the required engineering vehicles;

[0016] S2. Evacuate all personnel not related to the construction;

[0017] S3. Production of toothed spiral piles: Sawtooth-shaped teeth are welded on both sides of the pile body along the length direction of the pile body, and the welding continues to 20 cm from the end of the pile body. Spiral blades and spiral drill bits are welded at the end of the pile body. It is important to select toothed spiral piles of different lengths according to the project design and site conditions.

[0018] S4. Pre-inspection of toothed screw piles: Check all parts of the prepared toothed screw piles before construction to check whether there are cracks in the welds and other problems that may affect the quality of the project and construction safety;

[0019] S5, piling; align the spiral drill bit with the construction point, connect the drilling rig to the top of the toothed spiral pile, start the grouting equipment, and cut the soil with double spiral blades. While rotating the pile into the soil, stir the soil around the pile to form a cement soil column with the cement sprayed from the grouting hole, and rotate the pile synchronously for pressure grouting until the specified depth;

[0020] S6. Inspection of the rodent lifting mixer: Before using the rodent lifting mixer for construction, it is necessary to inspect the rodent lifting mixer to check whether the rodent lifting mixer can work, whether the battery power is sufficient, whether the program instructions are correct, and other issues that may affect the quality of the project and construction safety;

[0021] S7. Installation of the meshing lifting mixer; two gears are symmetrically arranged on the inner wall of the meshing lifting mixer, and the two gears are perfectly meshed with the teeth on the meshing spiral pile, so that the mixer can move along the pile body;

[0022] S8, re-mixing; start the mixer, make the meshing lifting mixer idle for 2-3 minutes, then adjust the mixer displacement speed along the pile body and the rotation speed of the mixing blades, and after adjusting the basic parameters, the cement slurry and the surrounding soil can be re-mixed;

[0023] S9, recycling of the meshing lifting mixer; after the meshing lifting mixer stops working, slowly separate the meshing lifting mixer from the spiral pile, and wipe the mud on the surface of the meshing lifting mixer with a rag;

[0024] S10. Maintenance of new mixers: After recycling, new mixers should be maintained, such as wiping off the dirt on the mixer surface, applying lubricating oil, and checking whether the electronic components are damaged.

[0025] Compared with the prior art, the significant improvements of the present invention are: 1) The construction method of using a new type of meshing lifting mixer to re-mix the slurry-soil mixture after the spiral pile is grouting, and the meshing spiral piles used are simple to manufacture and consume less materials; 2) The construction method of using a new type of meshing lifting mixer to re-mix the slurry-soil mixture after the spiral pile is grouting is easy to operate, and the output power of the mixer can be adjusted according to actual conditions to form cement soil that meets actual conditions.

[0026] In order to more clearly illustrate the functional characteristics and structural parameters of the present invention, further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the toothed screw pile in the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the rodent lifting mixer in the present invention;

[0031] Figure 4 It is a working schematic diagram of a device suitable for remixing cement soil around a grouting screw pile in the present invention;

[0032] The reference numerals in the figure are: 1-meshing screw pile; 2-meshing lifting mixer; 3-screw drill bit; 4-screw blade; 5-grouting hole; 6-meshing screw pile body; 7-meshing; 8-mixing blade; 9-lower port; 10-upper port; 11-slide rail; 12-cement soil column. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] like Figure 1-Figure 3As shown, a device suitable for remixing cement soil around a grouting screw pile comprises a meshing screw pile 1 and a meshing lifting mixer 2; the meshing screw pile 1 comprises a spiral drill bit 3 and a meshing screw pile body 6, the spiral drill bit 3 is arranged at the bottom of the meshing screw pile body 6; the meshing screw pile body 6 is provided with grouting holes 5, and both sides of the meshing screw pile body 6 are provided with sawtooth-type meshing teeth 7 distributed along the length of the pile body; the meshing lifting mixer 2 is a hollow cylindrical mechanical device with built-in symmetrical gears, which is sleeved on the outer side of the meshing screw pile 1, and the sawtooth-type meshing teeth 7 on both sides of the pile body are mechanically engaged with the built-in symmetrical gear mechanical device of the meshing lifting mixer 2, so that the meshing lifting mixer 2 can move up and down along the meshing screw pile body 6.

[0035] Specifically, a spiral blade 4 is arranged on the outside of the meshing screw pile body 6 , there are two grouting holes 5 symmetrically distributed on both sides of the meshing screw pile body 6 , and a plurality of mixing blades 8 are arranged on the outside of the meshing lifting mixer 2 .

[0036] Specifically, the meshing lifting mixer 2 includes a mixing blade 8, a lower port 9, an upper port 10 and a slide rail 11; the mixing blade 8 is a long iron sheet, symmetrically welded on both sides of the slide rail 11; the lower port 9 and the upper port 10 are both cylindrical in shape, welded at the upper and lower ends of the mixer; the slide rail 11 is a cylinder mounted on the outer surface of the mixer, and is connected to the internal drive motor of the mixer by bolts.

[0037] Specifically, a driving motor is provided inside both sides of the meshing lifting mixer 2. The driving motor is a rechargeable driving motor with a built-in battery. The driving motor is a three-phase asynchronous motor, including a stator and a rotor. The upper port 10 and the lower port 9 are both provided with a stator and a rotor. The three-phase winding of the stator generates a rotating magnetic field. The rotor is a squirrel cage structure without a brush. The electromagnetic induction drives the slide rail 11 to rotate, thereby driving the stirring blade 8 to rotate. The driving motor battery is a lithium battery, and the battery is charged and discharged through chemical reactions.

[0038] Specifically, the outer shell of the rodent lifting mixer 2 is made of iron and a layer of paint is sprayed on the surface of the iron outer shell; the electronic instruments and batteries in the rodent lifting mixer are provided with outer shell thickening waterproof measures and sprayed with waterproof materials.

[0039] Specifically, a layer of anti-corrosion paint is sprayed on the surface of the toothed screw pile 1 .

[0040] Figure 4 As shown, a construction method suitable for cement-soil remixing around grouting screw piles comprises the following steps:

[0041] S1. Level the site and leave enough space to accommodate the required engineering vehicles;

[0042] S2. Evacuate all personnel not related to the construction;

[0043] S3, production of toothed screw piles; sawtooth-shaped teeth are welded on both sides of the toothed screw pile along the length direction of the pile body, and the welding continues to 20 cm from the end of the pile body, and spiral blades and spiral drill bits are welded at the end of the pile body;

[0044] S4. Preliminary inspection of toothed screw piles: Check all parts of the manufactured toothed screw piles before construction;

[0045] S5, piling; align the spiral drill bit with the construction point, connect the drilling rig to the top of the toothed spiral pile, start the grouting equipment, and cut the soil with double spiral blades. While rotating the pile into the soil, stir the soil around the pile to form a cement soil column with the cement sprayed from the grouting hole, and rotate the pile synchronously for pressure grouting until the specified depth;

[0046] S6. Inspection of the rodent lifting mixer: Before using the rodent lifting mixer for construction, it is necessary to inspect the rodent lifting mixer to check whether the rodent lifting mixer can work, whether the battery power is sufficient, and whether the program instructions are correct;

[0047] S7, installation of a meshing lifting mixer; two gears are symmetrically arranged on the inner wall of the meshing lifting mixer, and the two gears are meshed with the meshing teeth on the meshing spiral pile, so that the mixer can be displaced along the pile body;

[0048] S8, re-mixing; start the mixer, make the meshing lifting mixer idle for 2-3 minutes, then adjust the mixer displacement speed along the pile body and the rotation speed of the mixing blades, and after adjusting the basic parameters, the cement slurry and the surrounding soil can be re-mixed;

[0049] S9, recycling of the meshing lifting mixer; after the meshing lifting mixer stops working, slowly separate the meshing lifting mixer from the spiral pile, and wipe the mud on the surface of the meshing lifting mixer with a rag;

[0050] S10. Maintenance of new mixers; new mixers should be maintained after recovery.

[0051] Example 1

[0052] The meshed screw pile 1 comprises a screw drill bit 3, a screw blade 4, a grouting hole 5, a meshed screw pile body 6, and meshing teeth 7. The diameter of the screw blade 4 is 2-3 times the outer diameter of the meshed screw pile body 6. The grouting hole 5 is located at the lower part of the screw blade 4, symmetrically opened, and the hole diameter is between 8-10 mm. The grouting hole 5 is used to pour cement slurry. The water-cement mass ratio of the cement slurry is between 0.4-0.6, and the grouting pressure is between 0.6-1.0 MPa. The outer diameter of the meshed screw pile body 6 is between 100-300 mm, and the length of the meshed screw pile body 6 is between 2-4 m. The main functions of the screw drill bit 3 and the screw blade 4 are to cut the soil. During the pile forming process, the screw blade 4 stirs the cement slurry and the soil around the pile, thereby forming a cement soil column 12 around the pile body. The meshed lifting mixer 2 performs re-stirring to mix the surrounding soil and the cement soil column 12 evenly, thereby improving the bearing capacity of the pile body and realizing rapid construction, safety and reliability.

[0053] Specifically, in this embodiment, the toothed lifting mixer 2 includes a mixing blade 8, a lower port 9, an upper port 10, and a slide rail 11. The mixing blade 8 is mainly used to mix the mixture formed by the soil and cement slurry, and finally form a cement soil column 12 with high bearing capacity and corrosion resistance.

[0054] Example 2

[0055] A construction method suitable for cement-soil remixing around grouting screw piles, specifically:

[0056] Step 1: Level the site to a size large enough to accommodate the required engineering vehicles;

[0057] Step 2: Evacuate people not related to the construction;

[0058] Step 3. Production of toothed spiral piles: Sawtooth-shaped teeth are welded on both sides of the toothed spiral pile along the length of the pile body, and the welding continues until 20 cm from the end of the pile body. Spiral blades and spiral drill bits are welded at the end of the pile body. Note that toothed spiral piles of different lengths should be selected according to the project design and site conditions.

[0059] Step 4: Pre-inspection of toothed screw piles: Inspect all parts of the prepared toothed screw piles before construction to check whether there are cracks in the welds and other problems that may affect the quality of the project and construction safety;

[0060] Step 5: Piling: Align the drill bit with the construction point, connect the drilling rig on the top, start the grouting equipment, and use the double spiral blades to cut the soil. While rotating the pile into the soil, stir the soil around the pile to form a cement-soil column with the cement sprayed from the grouting hole. Rotate the pile synchronously and inject pressure grouting until the specified depth.

[0061] Step 6. Inspection of the rodent lifting mixer: Before using the rodent lifting mixer for construction, it is also necessary to inspect the rodent lifting mixer, mainly to check whether the rodent lifting mixer can work, whether the battery power is sufficient, whether the program instructions are correct, and other issues that may affect the quality of the project and construction safety;

[0062] Step 7: Installation of the meshing lifting mixer: Two gears are symmetrically arranged on the inner wall of the meshing lifting mixer, and these two gears can perfectly mesh with the teeth on the meshing spiral pile, so that the mixer can move along the pile body;

[0063] Step 8: Re-mixing: Start the mixer and let the meshing lifting mixer run idle for 2-3 minutes, then adjust the mixer displacement speed along the pile body and the rotation speed of the mixing blades. After adjusting the basic parameters, the cement slurry and the surrounding soil can be re-mixed;

[0064] Step 9: Recycling of the rodent lifting mixer: After the mixer stops working, slowly separate the mixer from the spiral pile and wipe the mud on the surface of the mixer with a rag in time;

[0065] Step 10. Maintenance of new mixers: New mixers should be maintained in time after recycling, such as wiping off the dirt on the surface of the mixer, applying lubricating oil, and checking whether the electronic components are damaged.

[0066] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device suitable for remixing cement soil around grouting screw piles, characterized in that: The invention comprises a meshing screw pile (1) and a meshing lifting mixer (2); the meshing screw pile (1) comprises a spiral drill bit (3) and a meshing screw pile body (6); the spiral drill bit (3) is arranged at the bottom of the meshing screw pile body (6); a grouting hole (5) is arranged on the meshing screw pile body (6); and sawtooth meshing teeth (7) distributed along the length of the pile body are arranged on both sides of the meshing screw pile body (6); the meshing lifting mixer (2) is a hollow cylindrical mechanical device with built-in symmetrical gears, which is sleeved on the outside of the meshing screw pile (1); the sawtooth meshing teeth (7) on both sides of the pile body are mechanically engaged with the built-in symmetrical gear mechanical device of the meshing lifting mixer (2), so that the meshing lifting mixer (2) can move up and down along the meshing screw pile body (6).

2. The device for remixing cement soil around a grouting screw pile according to claim 1, characterized in that: The outer side of the toothed screw pile body (6) is provided with a spiral blade (4).

3. The device for remixing cement soil around a grouting screw pile according to claim 1, characterized in that: There are two grouting holes (5) in total and they are symmetrically distributed on both sides of the toothed screw pile body (6).

4. The device for remixing cement soil around a grouting screw pile according to claim 1, characterized in that: The outer side of the toothed lifting mixer (2) is provided with a plurality of mixing blades (8).

5. The device for remixing cement soil around a grouting screw pile according to claim 1, characterized in that: The meshing lifting mixer (2) comprises a mixing blade (8), a lower port (9), an upper port (10) and a slide rail (11); the mixing blade (8) is a long iron sheet, symmetrically welded to both sides of the slide rail (11); the lower port (9) and the upper port (10) are both cylindrical in shape, welded to the upper and lower ends of the mixer; the slide rail (11) is a cylinder sleeved on the outer surface of the mixer, and connected to the internal drive motor of the mixer by bolts.

6. The device for remixing cement soil around a grouting screw pile according to claim 5, characterized in that: Drive motors are arranged inside the two sides of the meshing lifting mixer (2), and the drive motors are rechargeable drive motors with built-in batteries. The drive motors are three-phase asynchronous motors, including a stator and a rotor. The upper port (10) and the lower port (9) are both provided with stators and rotors, and the three-phase winding of the stator generates a rotating magnetic field. The rotor is a squirrel cage structure without brushes, and the slide rail (11) is driven to rotate by electromagnetic induction, thereby driving the stirring blades (8) to rotate.

7. The device for remixing cement soil around a grouting screw pile according to claim 1, characterized in that: The outer shell of the rodent lifting mixer (2) is made of iron and a layer of paint is sprayed on the surface of the iron outer shell; the electronic instruments and batteries in the rodent lifting mixer are provided with waterproof measures of thickening the outer shell and spraying waterproof materials.

8. The device for remixing cement soil around a grouting screw pile according to claim 1, characterized in that: A layer of anti-corrosion paint is sprayed on the surface of the toothed screw pile (1).

9. A construction method for remixing cement soil around a grouting screw pile, the method is based on a device for remixing cement soil around a grouting screw pile as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Level the site and leave enough space to accommodate the required engineering vehicles; S2. Evacuate all personnel not related to the construction; S3, production of toothed screw piles; sawtooth-shaped teeth are welded on both sides of the toothed screw pile along the length direction of the pile body, and the welding continues to 20 cm from the end of the pile body, and spiral blades and spiral drill bits are welded at the end of the pile body; S4. Preliminary inspection of toothed screw piles: Check all parts of the manufactured toothed screw piles before construction; S5, piling; align the spiral drill bit with the construction point, connect the drilling rig to the top of the toothed spiral pile, start the grouting equipment, and cut the soil with double spiral blades. While rotating the pile into the soil, stir the soil around the pile to form a cement soil column with the cement sprayed from the grouting hole, and rotate the pile synchronously for pressure grouting until the specified depth; S6. Inspection of the rodent lifting mixer: Before using the rodent lifting mixer for construction, it is necessary to inspect the rodent lifting mixer to check whether the rodent lifting mixer can work, whether the battery power is sufficient, and whether the program instructions are correct; S7, installation of a meshing lifting mixer; two gears are symmetrically arranged on the inner wall of the meshing lifting mixer, and the two gears are meshed with the meshing teeth on the meshing spiral pile, so that the mixer can be displaced along the pile body; S8, re-mixing; start the mixer, make the meshing lifting mixer idle for 2-3 minutes, then adjust the mixer displacement speed along the pile body and the rotation speed of the mixing blades, and after adjusting the basic parameters, the cement slurry and the surrounding soil can be re-mixed; S9, recycling of the meshing lifting mixer; after the meshing lifting mixer stops working, slowly separate the meshing lifting mixer from the spiral pile, and wipe the mud on the surface of the meshing lifting mixer with a rag; S10. Maintenance of new mixers; new mixers should be maintained after recovery.

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