Building device for house building foundation engineering construction

Abstract

The invention relates to the technical field of building construction, and discloses a house building foundation engineering construction device which comprises a multi-shaft pile driver body, a power integration box is installed on one side of the multi-shaft pile driver body in a limiting and sliding mode, and a plurality of stirring piles are rotatably installed at the output end of the power integration box; driving gears are fixedly mounted on the outer sides of the top ends of the stirring piles, the multiple driving gears are in meshing transmission, and mounting cavities formed in the inner side walls of the driving gears are further included. The connecting strength between the mixing pile and the driving gears is changed through coincidence or dislocation between the permanent magnet plates and the magnetism isolating plates, so that the probability that the mixing pile is damaged when the bottom end of the mixing pile encounters a hard obstacle is reduced, and the situation that a plurality of driving gears bear extra load and impact due to mutual meshing is avoided; the driving gear and the power system are protected, the service life of the multi-shaft pile driver body is prolonged, the influence of hard obstacles on the construction progress is reduced, and the construction progress and the engineering quality of the sealing wall are improved.

Description

Technical Field

[0001] This application relates to the technical field of building construction, and particularly relates to a construction device for a building foundation engineering. Background Art

[0002] In the construction industry, before construction on soft soil foundations, due to the high water content, large compressibility, and low strength of soft soil foundations, it is necessary to quickly drain the water in the foundation through the vacuum preloading method to accelerate the consolidation of the foundation. Before draining the foundation using the vacuum preloading method, it is necessary to build a sealing wall according to the design drawings to isolate the external air and ensure the stability and effectiveness of the negative pressure environment during the vacuum preloading process. When building the sealing wall, it is necessary to first use a hollow long auger pile driver to drive piles, and then pump cement slurry into the foundation through a mixing pile by a high-pressure grouting pump. As the mixing pile moves upward, the cement slurry is fully mixed with the surrounding soil, undergoing a series of complex physical and chemical reactions, and finally solidifying into a sealing wall with a certain strength and density.

[0003] In this process, if the drill bit at the bottom end of the mixing pile encounters hard obstacles such as boulders, it will cause an instantaneous and violent impact on the drill bit and the mixing pile. This may not only lead to serious consequences such as drill bit damage, mixing pile deformation, or even fracture. In a multi-axis mixing pile system, since the power sources of multiple mixing piles do not operate independently, but are interconnected and work together, when one mixing pile is instantaneously stalled due to encountering an obstacle, the other mixing piles will also be implicated and forced to bear additional loads and impacts. This chain reaction will not only cause multiple mixing piles to be damaged simultaneously, increasing the difficulty and cost of maintenance, but also significantly reduce the service life of the equipment, having an adverse impact on the entire construction progress and project quality. Summary of the Invention

[0004] This application proposes a construction device for a building foundation engineering. When the bottom end of the mixing pile encounters a hard obstacle, it can reduce the magnetic field strength of the magnetorheological fluid in the installation cavity by the coincidence of the permanent magnet plate and the magnetic isolation plate, thereby reducing the connection strength between the mixing pile and the driving gear, having a certain buffering effect on the mixing pile, reducing the probability of the mixing pile being damaged. At the same time, each mixing pile can independently cope with external impacts to a certain extent, avoiding multiple driving gears from bearing additional loads and impacts due to meshing with each other, protecting multiple driving gears and the power system, extending the service life of the multi-axis pile driver body, reducing the impact of hard obstacles on the construction progress, and improving the construction quality of the sealing wall, so as to solve the problem that when driving piles through multi-axis mixing piles, the simultaneous damage of multiple mixing piles caused by one mixing pile encountering a hard obstacle reduces the service life of the equipment and affects the construction progress.

[0005] To achieve the above object, the present application adopts the following technical solution: A construction device for building foundation engineering, including a multi-axis pile driver body. A power integration box is installed on one side of the multi-axis pile driver body in a limited sliding manner. The output end of the power integration box is rotatably installed with multiple mixing piles. A driving gear is fixedly installed on the outer side of the top end of the mixing pile, and the multiple driving gears are meshed and driven with each other. It also includes an installation cavity opened on the inner side wall of the driving gear. The installation cavity is filled with magnetorheological fluid. A plurality of permanent magnet plates are fixedly installed on the inner side wall of the installation cavity, which is used to maintain the strength of the magnetorheological fluid in a quasi-solid state inside the installation cavity. A plurality of magnetic isolation plates are fixedly sleeved on the outer side of the mixing pile, which is used to change the magnetic field strength of the magnetorheological fluid. Initially, the magnetorheological fluid is in a quasi-solid state, and the power system of the multi-axis pile driver body normally drives the driving gear and the mixing pile to rotate. When the mixing pile encounters a hard obstacle and causes an instantaneous stagnation, the relative rotation between the mixing pile and the driving gear makes the permanent magnet plate and the magnetic isolation plate partially overlap, reducing the bonding strength of the magnetorheological fluid, thereby buffering the mixing pile and the driving gear and reducing the probability of damage to the multiple driving gears meshing with each other.

[0006] Further, the plurality of magnetic isolation plates are distributed in an annular array, and the outer side wall of the magnetic isolation plate is in contact with or separated from the inner side wall of the permanent magnet plate.

[0007] Further, a pair of support frames are fixedly installed on the outer side of the mixing pile. The bottom end and the top end of the magnetic isolation plate are respectively fixedly connected to the corresponding support frames, and the magnetic isolation plate is fixedly sleeved on the outer side of the mixing pile through the support frames.

[0008] Further, the two support frames are respectively in contact with the inner bottom wall or the inner top wall of the installation cavity, which is used to stir the magnetorheological fluid on the inner bottom wall of the installation cavity.

[0009] Further, a pair of limit sliding grooves are opened on the inner side wall of the driving gear. The two limit sliding grooves are respectively located at the bottom end and the top end of the installation cavity. A fixing plate is fixedly installed on the inner side wall of the limit sliding groove. A spring is fixedly installed on one side of the fixing plate. A plurality of limit sliding blocks are fixedly installed on the outer side of the mixing pile and are in limit sliding connection with the limit sliding grooves, and one of the limit sliding blocks is fixedly connected to the end of the spring away from the fixing plate.

[0010] The beneficial effects of the present invention are as follows: A construction device for building foundation engineering provided by the present application, when the mixing pile encounters a hard obstacle, the magnetic field intensity of the magnetorheological fluid inside the installation cavity is reduced by the coincidence of the magnetic isolation plate and the permanent magnet plate, thereby reducing the connection strength between the mixing pile and the driving gear, so that when the bottom end of the mixing pile encounters a hard obstacle, it can have a certain buffering effect on the mixing pile, reducing the probability of damage to the mixing pile. At the same time, each mixing pile can independently cope with external impacts to a certain extent, avoiding multiple driving gears from bearing additional loads and impacts due to meshing with each other, protecting multiple driving gears and the power system, extending the service life of the multi-axis pile driver body, reducing the impact of hard obstacles on the construction progress, and improving the construction quality of the sealed wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings: Figure 1 It is a three-dimensional structure diagram of the present invention; Figure 2 It is a top view sectional structure diagram of the power integration box of the present invention; Figure 3 It is a front view sectional structure diagram of the driving gear and the mixing pile of the present invention; Figure 4 It is a structure diagram of the driving gear of the present invention; Figure 5 It is a structure diagram of the mixing pile, the magnetic isolation plate and the limit slider of the present invention.

[0012] In the figure: 1. Multi-axis pile driver body; 2. Power integration box; 3. Mixing pile; 4. Driving gear; 5. Installation cavity; 6. Permanent magnet plate; 7. Support frame; 8. Magnetic isolation plate; 9. Limit chute; 10. Fixed plate; 11. Spring; 12. Limit slider. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0014] Refer to Figures 1 to 2, a construction device for building foundation engineering, including a multi-axis pile driver body 1. One side of the multi-axis pile driver body 1 is limited and slidably installed with a power integration box 2. The output end of the power integration box 2 is rotatably installed with multiple mixing piles 3, and the mixing piles 3 are hollow. The bottom end of the mixing pile 3 is fixedly installed with mixing blades. The outer side of the top end of the mixing pile 3 is fixedly installed with driving gears 4, and the multiple driving gears 4 are meshed and driven. When it is necessary to drive piles in the trench through the multi-axis pile driver body 1, first move the multi-axis pile driver body 1 to the positioning place, drive one of the driving gears 4 to rotate through the power system, and then drive all the mixing piles 3 to rotate through the meshing drive between the multiple driving gears 4. The multiple mixing piles 3 rotate and move downward at the same time. After the bottom ends of the multiple mixing piles 3 move to the required depth, pump cement slurry or high-pressure gas into the inner cavity of the mixing piles 3 through a high-pressure grouting pump and an air pump, and enter the soil through the mixing piles 3 and the discharge ports at the bottom ends of the mixing piles 3. As the mixing piles 3 move upward, the mixing of the mixing blades at the bottom ends of the mixing piles 3 and the impact of the high-pressure gas jointly assist the uniform penetration and diffusion of the cement slurry. The cement slurry and the soil are fully mixed, and a series of complex physical and chemical reactions occur, and finally solidify into a sealed wall with a certain strength and density.

[0015] Please refer to Figures 3 to 5 , an installation cavity 5 is opened on the inner side wall of the driving gear 4. The installation cavity 5 is filled with magnetorheological fluid. The driving gear 4 is fixedly connected with the mixing pile 3 through the quasi-solid magnetorheological fluid. A plurality of permanent magnet plates 6 are fixedly installed on the inner side wall of the installation cavity 5. The permanent magnet plates 6 are made of permanent magnetic materials, and the multiple permanent magnet plates 6 are distributed in a circular array. Through the permanent magnet plates 6, the magnetorheological fluid inside the installation cavity 5 is kept in a quasi-solid state. Furthermore, when the power system drives the driving gear 4 to rotate, the driving gear 4 can drive the mixing pile 3 to rotate through the magnetorheological fluid. The shear yield stress range of the magnetorheological fluid under the action of the magnetic field is 10 - 100 kPa, and its strength is positively correlated with the magnetic field strength. Therefore, construction workers can select appropriate permanent magnet plates 6 according to the results obtained from the geological condition investigation of the soft soil foundation before construction, so that the magnetorheological fluid filled inside the installation cavity 5 can provide sufficient shear resistance, thereby preventing relative rotation between the driving gear 4 and the mixing pile 3 when the driving gear 4 rotates. A pair of support frames 7 are fixedly installed on the outer side of the mixing pile 3. The two support frames 7 are respectively attached to the inner bottom wall or the inner top wall of the installation cavity 5. When the support frame 7 rotates with the mixing pile 3, the support frame 7 placed at the bottom can stir the magnetorheological fluid on the inner bottom wall of the installation cavity 5, preventing the magnetic particles in the magnetorheological fluid from settling due to gravity or centrifugal force, resulting in the layering of the suspension and the failure of magnetic field control.

[0016] Please refer to Figures 3 to 5, a plurality of magnetic shielding plates 8 distributed in an annular array are fixedly installed between two support frames 7. The magnetic shielding plates 8 are made of a material with high magnetic susceptibility, and the outer side walls of the magnetic shielding plates 8 are in contact with or separated from the inner side walls of the permanent magnetic plates 6. In the initial state, the plurality of permanent magnetic plates 6 and the magnetic shielding plates 8 are staggered and do not overlap. Therefore, the magnetic shielding plates 8 do not affect the magnetic field strength of the magnetorheological fluid, and the driving gear 4 can drive the mixing pile 3 to rotate synchronously through the magnetorheological fluid to stir the soil. When the bottom end of the mixing pile 3 encounters a hard obstacle and causes an instantaneous stagnation, the mixing pile 3 drives the magnetic shielding plate 8 to partially overlap with the permanent magnetic plate 6 through the support frame 7. The overlap of the magnetic shielding plate 8 and the permanent magnetic plate 6 reduces the magnetic field strength of the permanent magnetic plate 6 on the magnetorheological fluid, and the connection strength between the mixing pile 3 and the driving gear 4 also decreases accordingly. Therefore, when the mixing pile 3 encounters a hard obstacle, it can have a certain buffering effect on the mixing pile 3, reducing the probability of damage to the mixing pile 3. If the mixing pile 3 cannot be separated from the encountered hard obstacle in time, the reduction of the connection strength between the mixing pile 3 and the driving gear 4 can also reduce the probability of damage to the plurality of meshing driving gears 4, protect the plurality of driving gears 4 and the power system, extend the service life of the multi-axis pile driver body 1, and improve the construction quality of the cut-off wall.

[0017] Please refer to Figure 4 and Figure 5 , a pair of limiting sliding grooves 9 are formed on the inner side wall of the driving gear 4. The two limiting sliding grooves 9 are respectively located at the bottom end and the top end of the installation cavity 5. A fixing plate 10 is fixedly installed on the inner side wall of the limiting sliding groove 9. A spring 11 is fixedly installed on one side of the fixing plate 10. A plurality of limiting sliders 12 which are in limiting sliding connection with the limiting sliding grooves 9 are fixedly installed on the outer side of the mixing pile 3. And one of the limiting sliders 12 is fixedly connected with the end of the spring 11 far away from the fixing plate 10. When the mixing pile 3 is affected by a hard obstacle and drives the magnetic shielding plate 8 to overlap with the permanent magnetic plate 6, at the same time, the mixing pile 3 drives the limiting slider 12 to slide in the limiting sliding groove 9, and the spring 11 is also stretched or compressed. When the bottom end of the mixing pile 3 is separated from the hard obstacle, under the action of the elastic force of the spring 11, the mixing pile 3, the magnetic shielding plate 8, the limiting slider 12, etc. gradually return to their original positions, thereby removing the shielding of the magnetic shielding plate 8 on the permanent magnetic plate 6 and allowing the magnetorheological fluid to return to the initial strength of a quasi-solid state.

[0018] Working principle: When the multi-axis pile driver body 1 needs to drive piles in the trench, first move the multi-axis pile driver body 1 to the positioning place, drive one of the driving gears 4 to rotate through the power system, and then drive all the mixing piles 3 to rotate through the meshing transmission between the multiple driving gears 4. The multiple mixing piles 3 rotate and move downward at the same time. After the bottom ends of the multiple mixing piles 3 move to the required depth, pump cement slurry or high-pressure gas into the inner cavity of the mixing piles 3 through the high-pressure grouting pump and air pump, and enter the soil through the mixing piles 3 and the discharge ports at the bottom ends of the mixing piles 3. As the mixing piles 3 move upward, the cement slurry is fully mixed with the soil, and a series of complex physical and chemical reactions occur, and finally solidify into a sealed wall with a certain strength and density. When the mixing piles 3 are running normally, multiple permanent magnet plates 6 and magnetic isolation plates 8 are staggered and do not overlap with each other. Therefore, the magnetic isolation plates 8 will not affect the magnetic field strength of the magnetorheological fluid, and the driving gears 4 can drive the mixing piles 3 to rotate synchronously through the magnetorheological fluid to stir the soil. When the bottom end of the mixing pile 3 encounters a hard obstacle and causes instantaneous stagnation, the resistance received by the mixing pile 3 causes the mixing pile 3 to drive the magnetic isolation plate 8 to partially overlap with the permanent magnet plate 6 through the support frame 7. The overlap of the magnetic isolation plate 8 and the permanent magnet plate 6 reduces the magnetic field strength of the permanent magnet plate 6 on the magnetorheological fluid, and the connection strength between the mixing pile 3 and the driving gear 4 also decreases accordingly. Therefore, when the mixing pile 3 encounters a hard obstacle, it can have a certain buffering effect on the mixing pile 3, reducing the probability of damage to the mixing pile 3. If the mixing pile 3 cannot be separated from the encountered hard obstacle in time, the reduction of the connection strength between the mixing pile 3 and the driving gear 4 can also reduce the probability of damage to the multiple meshing driving gears 4, avoiding the multiple driving gears 4 from bearing additional loads and impacts, protecting the multiple driving gears 4 and the power system, prolonging the service life of the multi-axis pile driver body 1, reducing the impact of hard obstacles on the construction progress, and improving the construction quality of the sealed wall.

[0019] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A construction device for building foundation engineering, comprising a multi-axis pile driver body (1), a power integration box (2) is installed on one side of the multi-axis pile driver body (1) in a limited sliding manner, a plurality of mixing piles (3) are rotatably installed at the output end of the power integration box (2), a driving gear (4) is fixedly installed on the outer side of the top end of the mixing pile (3), and the plurality of driving gears (4) are meshed and driven with each other, characterized in that, It further includes an installation cavity (5) opened on the inner side wall of the driving gear (4). The interior of the installation cavity (5) is filled with magnetorheological fluid. A plurality of permanent magnet plates (6) are fixedly installed on the inner side wall of the installation cavity (5) to maintain the strength of the magnetorheological fluid in a quasi-solid state inside the installation cavity (5). A plurality of magnetic isolation plates (8) are fixedly sleeved on the outer side of the mixing pile (3) to change the magnetic field strength of the magnetorheological fluid. Initially, the magnetorheological fluid is in a quasi-solid state. The power system of the multi-axis pile driver body (1) normally drives the driving gear (4) and the mixing pile (3) to rotate. When the mixing pile (3) encounters a hard obstacle and causes an instantaneous stop, the relative rotation between the mixing pile (3) and the driving gear (4) makes the permanent magnet plate (6) and the magnetic isolation plate (8) partially overlap, reducing the connection strength of the magnetorheological fluid, thereby buffering the mixing pile (3) and the driving gear (4) and reducing the probability of damage to the multiple driving gears (4) engaged with each other.

2. The construction device for a building foundation project according to claim 1, characterized in that, The plurality of magnetic isolation plates (8) are distributed in an annular array, and the outer side wall of the magnetic isolation plate (8) is in contact with or separated from the inner side wall of the permanent magnet plate (6).

3. A construction device for building foundation engineering according to claim 2, characterized in that, A pair of support frames (7) are fixedly installed on the outer side of the mixing pile (3). The bottom end and the top end of the magnetic isolation plate (8) are respectively fixedly connected to the corresponding support frames (7), and the magnetic isolation plate (8) is fixedly sleeved on the outer side of the mixing pile (3) through the support frames (7).

4. A construction device for building foundation works according to claim 3, characterized in that, The two support frames (7) are respectively in contact with the inner bottom wall or the inner top wall of the installation cavity (5) for stirring the magnetorheological fluid on the inner bottom wall of the installation cavity (5).

5. A construction device for a building foundation project according to claim 1, characterized in that, A pair of limit sliding grooves (9) are opened on the inner side wall of the driving gear (4). The two limit sliding grooves (9) are respectively located at the bottom end and the top end of the installation cavity (5). A fixing plate (10) is fixedly installed on the inner side wall of the limit sliding groove (9). A spring (11) is fixedly installed on one side of the fixing plate (10). A plurality of limit sliding blocks (12) which are in limit sliding connection with the limit sliding grooves (9) are fixedly installed on the outer side of the mixing pile (3), and one of the limit sliding blocks (12) is fixedly connected to the end of the spring (11) far away from the fixing plate (10).

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