Pile forming device for variable-diameter cement-soil composite pile

Abstract

The utility model discloses a variable-diameter cement-soil composite pile forming device, which belongs to the technical field of foundation treatment and mainly comprises a cement-soil mixer truck, a drill rod and a cement-soil slurry transportation system. According to the variable-diameter cement-soil composite pile, the upper stirring blade and the lower stirring blade (with different guniting radiuses) can both perform guniting and pile forming, and the guniting radiuses of the stirring blades can be adjusted, so that the variable-diameter cement-soil composite pile is formed; the large-range grouting pile forming of the stratum with the soft soil interlayer is achieved, and key reinforcement of bad foundations such as the soft soil interlayer is achieved.

Description

Technical Field

[0001] The present invention relates to a pile-forming device for variable-diameter cement-soil composite piles, in particular to a pile-forming device for cement-soil pipe pile composite piles applied to geological strata with soft soil interlayers, belonging to the technical field of foundation treatment. Background Art

[0002] In recent years, with the development of the economy, the scale and level of urban and road construction in China have developed rapidly, especially the urbanization level in the eastern coastal areas has increased rapidly. Behind the rapid development of urbanization in the eastern coastal areas, the number of building accidents is appalling. One of the reasons for the frequent occurrence of building accidents is that soft soil layers generally exist in the geology of the eastern region of China, which are characterized by low bearing capacity, large foundation deformation, and large uneven deformation. Therefore, the foundation reinforcement of buildings and roads under soft soil layer conditions is an urgent problem to be solved.

[0003] Due to its small settlement, reliable pile body quality, and fast construction speed, cement-soil composite piles are increasingly widely used in engineering construction, and their excellent reinforcement effect on soft soil layers makes them more and more widely used in foundation treatment. At present, there are two methods for forming cement-soil composite piles: one is to use the high-pressure jet grouting process. First, construct cement-soil piles at the pile positions, and then drive rigid piles into the cement-soil piles to form composite piles. It has the following disadvantages: Since the cement-soil piles are formed by the high-pressure jet grouting process, affected by the properties of each vertical soil layer, its pile diameter and strength are uneven, and it is difficult to judge the pile diameter and the strength of the cement soil. In addition, the high-pressure jet process is prone to environmental pollution and high cost, which does not conform to the concept of green construction advocated by the country. The second is the SDP static drilling and root planting method, which combines improved cement-soil mixing piles and pipe piles to form composite piles. The currently used integrated drilling and jetting rotary jet grouting machine on the market is transformed from a cement-soil mixing pile machine. It has the following disadvantages: The driving turntable rotates too fast, the drill pipe lifting device is linked with the turntable (fixed), the action time of the jet flow in the soil layer is short, and affected by factors such as the properties of natural foundation soil, the pressure, flow rate, swing, and lifting parameters of the cement slurry, the jet radius is small and the cement slurry loss is large. At present, there is little targeted design for cement-soil composite piles under the geological conditions of soft soil layers. The pile-forming accuracy of the already applied cement-soil composite piles is low and the resource waste is serious. Utility Model Content

[0004] In order to solve the deficiencies of the above problems, the present invention proposes a pile-forming device for variable-diameter cement-soil pipe pile composite piles. Compared with the prior art, the present invention can achieve: both the upper and lower stirring blades (with different jet grouting radii) can jet grout to form piles and the stirring blades can adjust the jet grouting radius to form variable-diameter cement-soil composite piles; large-range grouting and pile forming in the strata with soft soil interlayers to form key reinforcement of poor foundations such as soft soil interlayers.

[0005] To achieve the above object, the present utility model provides the following technical solutions:

[0006] A variable-diameter cement-soil composite pile forming device, comprising: a cement-soil mixer truck; a drill pipe assembly; a cement-soil slurry transportation system.

[0007] The cement-soil mixer truck includes a vehicle chassis, wheel rods, wheel frames, wheels, an upright frame, upright frame struts, guide rails, traveling wheels of the loading mechanism, a winch, high-strength steel wires, and a pulley block; the wheel rods are fixed below the four corners of the vehicle chassis, the wheel frames are fixed at the bottom ends of the wheel rods, and the wheels are rotatably installed on the wheel frames; the wheel rods are telescopic rods that can be extended and retracted in length to level the entire cement-soil mixing device. The upright frame is fixed above the vehicle chassis and fixed with upright frame struts; the guide rails are fixed on one side of the upright frame struts, and traveling wheels of the loading mechanism are cooperatively arranged on the guide rails, and the traveling wheels of the loading mechanism can move up and down along the guide rails; the winch is fixed above the vehicle chassis, the high-strength steel wires extend out of the winch, and are connected to the traveling wheels of the loading mechanism via the pulley block fixed above the upright frame to prevent the drill pipe from breaking free and sinking into the drill hole.

[0008] The drill pipe assembly includes a loading mechanism, a variable-frequency motor, an outer drill pipe, an inner drill pipe, a hinge assembly, a moving guide rail, bolts, rubber rings, upper mixing blades, lower mixing blades, hoses, and a drill bit. The loading mechanism is fixed on the traveling wheels of the loading mechanism and powered by a variable-frequency motor, and vertically moves with the traveling wheels of the loading mechanism. The loading mechanism controls the rotation of the outer drill pipe to achieve the rotational mixing of the drill pipe. The loading mechanism controls the up and down movement of the inner drill pipe and drives the hinge assembly fixed on the inner drill pipe to move vertically. The inner drill pipe is arranged inside the outer drill pipe. The moving guide rails are fixed inside the front and rear sides of the upper mixing blades and the lower mixing blades, and the inner ends of the hinge shafts of the hinge assembly are located inside the moving guide rails, and the hinge shafts can move along the moving guide rails of the hinge heads. The vertical movement of the hinge assembly drives one end of the upper mixing blades and the lower mixing blades equipped with the moving guide rails to swing, and at the same time, the parts of the upper mixing blades and the lower mixing blades passing through the outer drill pipe are connected to the outer drill pipe by bolts, and finally the upper mixing blades and the lower mixing blades swing around the bolts, and the swinging of the upper mixing blades and the lower mixing blades changes the slurry spraying radius of the nozzles, thus realizing variable-diameter slurry spraying. The pores at the opening positions of the outer drill pipe at the bolts are sealed with rubber rings to prevent soil from entering. The inner ends of the upper mixing blades and the lower mixing blades are connected to the inner drill pipe through hoses. The drill bit is fixed at the bottom end of the outer drill pipe.

[0009] The cement-soil slurry transportation system includes a cement slurry pump, a high-pressure cement slurry pipe, a cement slurry channel, and nozzles. One end of the high-pressure cement slurry pipe is connected to a cement slurry pool (not shown in the figure), and the other end is connected to the inner drill pipe. The cement slurry pump is arranged on the high-pressure cement slurry pipe. The cement slurry channel is arranged inside the upper mixing blades and the lower mixing blades. The nozzles are arranged on the upper mixing blades and the lower mixing blades and communicate with the cement slurry channel. The cement slurry channel transports the cement slurry from the inner drill pipe to the tips of the upper mixing blades and the lower mixing blades and sprays out the cement slurry through the nozzles.

[0010] The swinging of the upper stirring blade and the lower stirring blade causes the stretching of the hose, so a high-strength and high-flexibility hose is selected.

[0011] The advantages of the present utility model are as follows:

[0012] 1. The tips of both the upper and lower stirring blades can spray slurry to form piles. The spraying range of the upper stirring blade is large, while the spraying and stirring range of the lower stirring blade is relatively small. At the same time, the stirring blade can adjust the spraying radius to form a variable-diameter cement-soil composite pile as shown in Figure 3 . This increases the pile-soil contact area and the pile side friction resistance, strengthens the overall anchoring effect of the pile-soil composite foundation, and increases the bearing capacity and deformation resistance of the pile-soil composite foundation;

[0013] 2. By swinging the upper and lower stirring blades to realize variable-diameter spraying of cement-soil slurry, it can be applied to large-scale grouting and pile formation in strata with soft soil interlayers, forming key reinforcement for poor foundations such as soft soil interlayers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 is the overall schematic diagram of the present utility model; Figure 2 is the detailed structural schematic diagram of the drill pipe assembly; Figure 3 is the construction effect schematic diagram of the drill pipe assembly.

[0016] Reference numerals: 1, vehicle chassis; 2, wheel rod; 3, wheel frame; 4, wheel; 5, vertical frame; 6, vertical frame strut; 7, guide rail; 8, traveling wheel of the loading mechanism; 9, winch; 10, high-strength steel wire; 11, pulley block; 12, loading mechanism; 13, variable-frequency motor; 14, outer drill pipe; 15, inner drill pipe; 16, hinge assembly; 17, moving guide rail; 18, bolt; 19, rubber ring; 20, upper stirring blade; 21, lower stirring blade; 22, hose; 23, drill bit; 24, cement slurry pump; 25, high-pressure cement slurry pipe; 26, nozzle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0018] A variable-diameter cement-soil composite pile forming device mainly includes: a cement-soil mixer truck; a drill pipe assembly; a cement-soil slurry transportation system.

[0019] As Figure 1 shown, the cement-soil mixer truck includes a vehicle chassis 1, a wheel rod 2, a wheel frame 3, wheels 4, an upright frame 5, an upright frame support rod 6, a guide rail 7, a traveling wheel 8 of the loading mechanism, a winch 9, high-strength steel wires 10, and a pulley block 11; the wheel rod 2 is fixed below the four corners of the vehicle chassis 1, the wheel frame 3 is fixed to the bottom end of the wheel rod 2, and the wheels 4 are rotatably installed on the wheel frame 3; the wheel rod 2 is a telescopic rod with adjustable length to level the entire cement-soil mixing device. The upright frame 5 is fixed above the vehicle chassis 1 and fixed with the upright frame support rod 6; the guide rail 7 is fixed on one side of the upright frame support rod 6, and a traveling wheel 8 of the loading mechanism is cooperatively arranged on the guide rail 7, and the traveling wheel 8 of the loading mechanism can move up and down along the guide rail 7; the winch 9 is fixed above the vehicle chassis 1, the high-strength steel wires 10 extend out of the winch 9, and are connected to the traveling wheel 8 of the loading mechanism through the pulley block 11 fixed above the upright frame 5 to prevent the drill pipe from breaking free and sinking into the drill hole.

[0020] As Figure 1 、 2As shown in the figure, the drill pipe assembly includes a loading mechanism 12, a variable-frequency motor 13, an outer drill pipe 14, an inner drill pipe 15, a hinge assembly 16, a moving guide rail 17, bolts 18, rubber rings 19, upper mixing blades 20, lower mixing blades 21, a hose 22, and a drill bit 23. The loading mechanism 12 is fixed on the traveling wheels 8 of the loading mechanism and powered by the variable-frequency motor 13, and moves vertically with the traveling wheels 8 of the loading mechanism. The loading mechanism 12 controls the rotation of the outer drill pipe 14 to realize the rotational mixing of the drill pipe. The loading mechanism 12 controls the up-and-down movement of the inner drill pipe 15 and drives the hinge assembly 16 fixed on the inner drill pipe 15 to move vertically. The inner drill pipe 15 is arranged inside the outer drill pipe 14. The moving guide rails 17 are fixed inside the front and rear sides of the upper mixing blades 20 and the lower mixing blades 21. The inner end of the hinge shaft of the hinge assembly 16 is located inside the moving guide rail 17, and the hinge shaft can move along the moving guide rail 17 of the hinge head. The vertical movement of the hinge assembly 16 drives one end of the upper mixing blades 20 and the lower mixing blades 21 equipped with the moving guide rails 17 to swing. At the same time, the parts of the upper mixing blades 20 and the lower mixing blades 21 passing through the outer drill pipe 14 are connected to the outer drill pipe 15 by bolts 18, and finally the upper mixing blades 20 and the lower mixing blades 21 swing around the bolts 18. The gaps at the openings of the outer drill pipe 15 at the positions of the bolts 18 are sealed with rubber rings 19 to prevent soil from entering. The inner ends of the upper mixing blades 20 and the lower mixing blades 21 are connected to the inner drill pipe 15 through a hose 22. The drill bit 23 is fixed at the bottom end of the outer drill pipe 14.

[0021] As Figure 2 shown, the length of the upper mixing blade 20 is greater than that of the lower mixing blade 21.

[0022] As Figure 2 shown, the cement-soil slurry transportation system includes a cement slurry pump 24, a high-pressure cement slurry pipe 25, a cement slurry channel, and a nozzle 26. One end of the high-pressure cement slurry pipe 25 is connected to a cement slurry pool (not shown in the figure), and the other end is connected to the inner drill pipe 15. The cement slurry pump 24 is arranged on the high-pressure cement slurry pipe 25. The cement slurry channel is arranged inside the upper mixing blades 20 and the lower mixing blades 21. The nozzle 26 is arranged on the upper mixing blades 20 and the lower mixing blades 21 and communicates with the cement slurry channel. The cement slurry channel transports the cement slurry from the inner drill pipe 15 to the tips of the upper mixing blades 20 and the lower mixing blades 21 and sprays out the cement slurry through the nozzle 26.

[0023] As Figure 3 shown, the swinging of the upper mixing blades 20 and the lower mixing blades 21 changes the spraying radius of the nozzle 26, thus realizing variable-diameter spraying.

[0024] As Figure 1 , 2As shown in the figure, the cement slurry flows along the following route: cement slurry pump 24, high-pressure cement slurry pipe 25, inner drill pipe 15, hose 22, upper stirring blade 20, lower stirring blade 21, nozzle 26.

[0025] Workflow:

[0026] After the soil-cement mixing truck reaches the designated position, fix the wheels 4, and the wheel rod 2 expands and contracts to level the soil-cement mixing device; start the loading mechanism 12, and control the downward movement of the inner drill pipe 15 through the loading mechanism 12, swing the upper stirring blade 20 and the lower stirring blade 21 upward to the minimum stirring radius, and reduce the excessive torque required for rotating the drill pipe during the first tunneling drilling due to the consolidation property of the undisturbed soil; control the vertical movement of the loading mechanism traveling wheels 8 within the range of the guide rail 7 through the loading mechanism 12, and at the same time control the rotation of the outer drill pipe 14 through the loading mechanism 12 to achieve the overall downward rotation tunneling and upward rotation lifting of the drill pipe; slowly lift the outer drill pipe 14 upward, and at the same time control the upward movement of the inner drill pipe 15 through the loading mechanism 12 to extend the upper stirring blade 20 and the lower stirring blade 21; slowly sink the outer drill pipe 14 downward, and at the same time control the downward movement of the inner drill pipe 15 through the loading mechanism 12 to contract the upper stirring blade 20 and the lower stirring blade 21.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A variable diameter cement soil composite pile forming device, characterized in that: The invention comprises a cement soil mixer truck, which is composed of a vehicle chassis (1), a wheel rod (2), a wheel frame (3), a wheel (4), a stand (5), a stand support rod (6), a guide rail (7), a loading mechanism travel wheel (8), a winch (9), a high-strength steel wire (10) and a pulley block (11); a drill rod assembly, which is composed of a loading mechanism (12), a variable frequency motor (13), an outer drill rod (14), an inner drill rod (15), a hinge assembly (16), a movable guide rail (17), a bolt (18), a rubber ring (19), an upper stirring blade (20), a lower stirring blade (21), a hose (22) and a drill bit (23); and a cement soil slurry transportation system, The cement soil slurry transportation system is composed of a cement slurry pump (24), a high-pressure cement slurry pipe (25), a cement slurry channel, and a nozzle (26). The wheel rod (2) is fixed below the four corners of the vehicle chassis (1), the wheel frame (3) is fixed to the bottom end of the wheel rod (2), and the wheel (4) is rotatably mounted on the wheel frame (3); the stand (5) is fixed above the vehicle chassis (1) and fixed by the stand support rod (6); the guide rail (7) is fixed to one side of the stand support rod (6), and the guide rail (7) is equipped with a loading mechanism travel wheel (8), and the loading mechanism travel wheel (8) can move up and down along the guide rail (7); the winch (9) is fixed above the vehicle chassis (1), and the high-strength steel wire (10) is connected from the winch (1) to the vehicle chassis (1). 9) and is connected to the loading mechanism travel wheel (8) via a pulley group (11) fixed on the upper part of the stand (5); the loading mechanism (12) is fixed on the loading mechanism travel wheel (8) and powered by a variable frequency motor (13), and moves vertically with the loading mechanism travel wheel (8); the loading mechanism (12) controls the rotation of the outer drill rod (14) to achieve rotary stirring of the drill rod; the loading mechanism (12) controls the up and down movement of the inner drill rod (15) and drives the hinge assembly (16) fixed on the inner drill rod (15) to move vertically; the inner drill rod (15) is arranged in the outer drill rod (14); the movable guide rail (17) is fixed in front of the upper stirring blade (20) and the lower stirring blade (21) Inside the rear two sides, the inner ends of the hinge shafts of the hinge assembly (16) are located in the movable guide rails (17), and the hinge shafts can move along the hinge movable guide rails (17); the parts of the upper stirring blades (20) and the lower stirring blades (21) passing through the outer drill rod (14) are connected to the outer drill rod (14) by bolts (18), and the upper stirring blades (20) and the lower stirring blades (21) can swing around the bolts (18); the holes of the outer drill rod (14) at the openings of the bolts (18) are sealed by rubber rings (19); the inner ends of the upper stirring blades (20) and the lower stirring blades (21) are connected to the inner drill rod (15) by a hose (22); and the drill bit (23) is fixed to the bottom end of the outer drill rod (14).

2. The variable diameter cement soil composite pile forming device according to claim 1 is characterized by: One end of the high-pressure cement slurry pipe (25) is connected to the cement slurry pool, and the other end is connected to the inner drill rod (15). The cement slurry pump (24) is arranged on the high-pressure cement slurry pipe (25). The cement slurry channel is arranged inside the upper stirring blade (20) and the lower stirring blade (21). The nozzle (26) is arranged on the upper stirring blade (20) and the lower stirring blade (21) and is connected to the cement slurry channel.

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