A new type of steel pipe stiff composite pile construction device and a construction method thereof

Abstract

The present application relates to a kind of novel steel pipe stiff composite pile construction device and its construction method, including support, thin-walled steel pipe, mixing drill bit, grouting mechanism, holder, expander, rotary mechanism, lifting mechanism;Rotary mechanism is connected support by lifting mechanism, rotary mechanism connects holder, holder is held in thin-walled steel pipe, mixing drill bit is fixedly connected to the bottom end of thin-walled steel pipe, the grouting pipe of grouting mechanism is located in thin-walled steel pipe, the grouting pipe outlet end is communicated with the grouting port on mixing drill bit, expander is sleeved in grouting pipe, and the sleeved position of expander is flush with holder;Wherein, the wall thickness of thin-walled steel pipe is 3~6mm, the cross-sectional dimension of upper portion of thin-walled steel pipe is greater than the cross-sectional dimension of lower portion of thin-walled steel pipe.It has beneficial effect, and the operation demand can be met by 3~6mm wall thickness thin-walled steel pipe, and construction cost is greatly reduced.And thin-walled steel pipe is designed as the structure form of variable cross section from top to bottom, which is in line with soil mechanics principle, and can further reduce cost.

Description

Technical Field

[0001] This invention relates to the field of impact load testing equipment, and in particular to a novel steel pipe stiffened composite pile construction device and its construction method. Background Technology

[0002] Currently, steel pipe reinforced composite pile construction mainly utilizes steel pipes as the mixing drill rods in the mixing pile construction. During the mixing process, the steel pipe needs to withstand a large rotational torque, which requires the steel pipe to have a certain strength, thus placing certain requirements on the wall thickness. For general conventional strata, the steel pipe wall thickness is not less than 8mm, resulting in a large weight per meter and high cost. After the mixing pile construction is completed, concrete is poured into the steel pipe. Concrete has a high compressive strength, so the strength requirements for the steel pipe are not as high during subsequent use. After the initial mixing and grouting construction is completed, the main function of the steel pipe is simply to isolate the concrete from the surrounding cement and soil when pouring concrete into the pipe.

[0003] Therefore, there is an urgent need for a new type of low-cost steel pipe reinforced composite pile construction device and its construction method. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a novel steel pipe rigid composite pile construction device and construction method, which solves the technical problem of high cost of the prior art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] On one hand, this invention provides a novel steel pipe reinforced composite pile construction device, including a support, a thin-walled steel pipe, a mixing drill bit, a grouting mechanism, a clamp, an expander, a rotating mechanism, and a lifting mechanism. The rotating mechanism is connected to the support via the lifting mechanism and is also connected to the clamp, which holds the thin-walled steel pipe. The mixing drill bit is fixedly connected to the bottom end of the thin-walled steel pipe. The grouting pipe of the grouting mechanism is located inside the thin-walled steel pipe, and the outlet end of the grouting pipe is connected to the grouting nozzle on the mixing drill bit. The expander is sleeved on the grouting pipe, and the sleeved position of the expander is flush with the clamp. The wall thickness of the thin-walled steel pipe is 3–6 mm, and the cross-sectional dimension of the upper part of the thin-walled steel pipe is larger than the cross-sectional dimension of the lower part.

[0009] Optionally, the thin-walled steel pipe has a segmented structure, which is formed by connecting multiple steel pipe sections sequentially, with adjacent steel pipe sections being fixedly connected. The grouting pipe is also formed by connecting multiple grouting pipe sections sequentially, with adjacent grouting pipe sections being connected by grouting pipe joints.

[0010] Optionally, the bottom end of the grouting pipe section is provided with a bottom base, and the top end of the grouting pipe section is provided with a top base that matches the bottom base. The grouting pipe joint includes a joint bracket, a screw, a linkage gear, a horizontal stabilizing bracket, and a rotating shaft. The joint bracket is rotatably connected to the upper end of the grouting pipe section via the rotating shaft, and its rotation axis is laterally oriented. The screw is screwed onto the joint bracket, and the linkage gear is rotatably mounted on the joint bracket and abuts against the screw. By rotating the linkage gear, the screw can be driven to rotate, causing the screw to be screwed upwards or downwards. The horizontal stabilizing bracket includes a fixed part and a rotating part. The fixed part is fixed to the top of the joint bracket, one end of the rotating part is hinged to one end of the fixed part, and the other end of the rotating part can be screwed onto the other end of the fixed part by a fastener. A locking space is formed between the rotating part and the fixed part for locking the grouting pipe section located above.

[0011] Optionally, a sealing ring is provided at the connection between two adjacent grouting pipe sections.

[0012] Optionally, a plurality of anchoring strips are uniformly embedded on the outer wall of the thin-walled steel pipe.

[0013] Optionally, the stirring drill bit is provided with a plurality of stirring blades evenly distributed.

[0014] Optionally, the grouting mechanism further includes a cement slurry distributor, a grouting hose, and a mud pump. The top end of the grouting pipe is connected to the first end of the grouting hose via the cement slurry distributor, and the second end of the grouting hose is connected to the mud pump.

[0015] Optionally, the lifting mechanism includes a winch and a wire rope wound around the winch. The winch is fixed to the support, and the slewing mechanism is suspended from the front of the bracket by the wire rope.

[0016] On the other hand, the present invention also provides a construction method using the above-mentioned novel steel pipe reinforced composite pile construction device, comprising the following steps:

[0017] S1. The thin-walled steel pipe is clamped by the clamp, and the expander expands to abut against the inner wall of the thin-walled steel pipe. The pre-made cement slurry is sprayed out from the spray nozzle through the grouting pipe by the grouting mechanism. The thin-walled steel pipe is driven to rotate by the rotary mechanism, which drives the mixing drill bit to stir the cement slurry. At the same time, the thin-walled steel pipe is lowered to the target depth by the lifting mechanism.

[0018] S2. The thin-walled steel pipe is stopped rotating by the rotary mechanism, the expander contracts and separates from the inner wall of the thin-walled steel pipe, the thin-walled steel pipe is released by the clamp, the grouting mechanism is closed, the grouting pipe is removed, and precast concrete is poured into the thin-walled steel pipe.

[0019] (III) Beneficial Effects

[0020] The beneficial effects of this invention are:

[0021] This invention provides a novel steel pipe reinforced composite pile construction device and its construction method. During construction, the device uses an expander to expand and abut against the inner wall of a thin-walled steel pipe, connecting the thin-walled steel pipe and the grouting pipe as a single unit. When the rotating mechanism drives the thin-walled steel pipe to rotate, it transmits the rotational torque to the grouting pipe. The grouting pipe is made of high-strength material, possessing high strength and capable of withstanding sufficiently large rotational torques. Furthermore, the grouting pipe is recyclable. During the mixing process, when encountering significant resistance, the thin-walled steel pipe is protected from damage under large rotational torques. Therefore, a wall thickness of 3-6 mm is sufficient to meet operational requirements. Compared to existing technologies, this construction device can meet operational requirements with a 3-6 mm wall thickness thin-walled steel pipe, significantly reducing construction costs. Moreover, the thin-walled steel pipe is designed with a variable cross-section structure from top to bottom, which conforms to soil mechanics principles and further reduces costs. Attached Figure Description

[0022] Figure 1 This is a front view of the novel steel pipe reinforced composite pile construction device in Embodiment 1 of the present invention;

[0023] Figure 2 This is a partial structural schematic diagram of the novel steel pipe rigid composite pile construction device in Embodiment 1 of the present invention;

[0024] Figure 3 This is a schematic diagram of the grouting pipe joint in Embodiment 1 of the present invention;

[0025] Figure 4 This is a top view of the grouting pipe joint in Embodiment 1 of the present invention;

[0026] Figure 5 This is a schematic diagram of the connection between the two grouting pipe sections in Embodiment 1 of the present invention;

[0027] Figure 6 This is a schematic diagram of the grouting pipe joint being opened in Embodiment 1 of the present invention;

[0028] Figure 7 This is a schematic diagram of the construction process of the novel steel pipe rigid composite pile construction device in Embodiment 1 of the present invention.

[0029] [Explanation of Labels in the Attached Image]

[0030] 1: Support; 2: Thin-walled steel pipe; 21: Nut; 3: Mixing drill bit; 31: Grouting nozzle; 32: Mixing blade; 41: Grouting pipe; 411: Grouting pipe section; 412: Bottom base; 413: Top base; 42: Grouting pipe joint; 421: Joint bracket; 422: Screw; 423: Linkage gear; 424: Fixed part; 425: Rotating part; 426: Rotating shaft; 427: Sealing ring; 43: Cement slurry distributor; 44: Grouting hose; 45: Mud pump; 5: Clamp; 6: Expander; 7: Rotary mechanism; 81: Winch; 82: Wire rope. Detailed Implementation

[0031] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0032] Example 1:

[0033] like Figure 1 and Figure 2As shown in the figure, a novel steel pipe reinforced composite pile construction device is provided in a specific embodiment of the present invention, including a support 1, a thin-walled steel pipe 2, a mixing drill bit 3, a grouting mechanism, a clamp 5, an expander 6, a rotating mechanism 7, and a lifting mechanism. The rotating mechanism 7 is connected to the support 1 through the lifting mechanism and is connected to the clamp 5. The clamp 5 clamps the thin-walled steel pipe 2. The mixing drill bit 3 is fixedly connected to the bottom end of the thin-walled steel pipe 2. The mixing drill bit 3 is evenly provided with multiple mixing blades 32. The grouting pipe 41 of the grouting mechanism is located inside the thin-walled steel pipe 2. The grout outlet end of the grouting pipe 41 is connected to the grout spray nozzle 31 on the mixing drill bit 3. The expander 6 is sleeved on the grouting pipe 41, and the sleeved position of the expander 6 is flush with the clamp 5. The wall thickness of the thin-walled steel pipe 2 is 3-6 mm, and the cross-sectional dimension of the upper part of the thin-walled steel pipe 2 (the cross-section perpendicular to its axial direction) is larger than the cross-sectional dimension of the lower part of the thin-walled steel pipe 2. The thin-walled steel pipe 2 is a variable cross-section tubular structure with its cross-sectional dimensions decreasing in multiple stages from top to bottom. In this embodiment, multiple anchoring strips are uniformly embedded on the outer wall of the thin-walled steel pipe 2. The anchoring strips are strip-shaped metal parts, evenly distributed and welded to the outer wall of the thin-walled steel pipe 2. The anchoring strips can significantly increase the anchoring effect between the thin-walled steel pipe 2 and the cement-soil.

[0034] Specifically, during construction, this novel steel pipe rigid composite pile construction device expands the thin-walled steel pipe 2 (2) to its inner wall via the expander 6, connecting the thin-walled steel pipe 2 and the grouting pipe 41 as a single unit. When the rotating mechanism 7 drives the thin-walled steel pipe 2 to rotate, it transmits the rotational torque to the grouting pipe 41. The grouting pipe 41 is made of high-strength material, possessing high strength and capable of withstanding sufficiently large rotational torque. Furthermore, the grouting pipe 41 is recyclable. During the mixing process, when encountering significant resistance, the thin-walled steel pipe 2 is protected from damage under high rotational torque conditions. Therefore, a 3-6mm thick thin-walled steel pipe 2 is sufficient to meet operational requirements. Compared to existing technologies, this construction device can meet operational needs with a 3-6mm thick thin-walled steel pipe 2, significantly reducing construction costs. Furthermore, the thin-walled steel pipe 2 is designed as a structure with a variable cross-section from top to bottom. Since the upper part of the entire pile body is subjected to greater force and the force decreases as it goes down, the thin-walled steel pipe 2 is designed with a relatively large upper diameter and a relatively small lower diameter, which not only conforms to the principles of soil mechanics but also further reduces costs.

[0035] Specifically, such as Figure 2As shown, the thin-walled steel pipe 2 has a segmented structure, formed by connecting multiple steel pipe sections sequentially, with adjacent sections fixedly connected. The grouting pipe 41 is also formed by connecting multiple grouting pipe sections 411 sequentially, with adjacent sections connected by a grouting pipe joint 42. A sealing ring 427 is provided at the connection point of adjacent sections 411 to improve sealing. This meets the requirements for low headroom conditions. In this embodiment, the bottom end of the lowest grouting pipe section 411 has a bolt, and the bottom end of the thin-walled steel pipe 2 has a nut 21 matching the bolt. The nut 21 is connected to the grouting nozzle 31 through a thin tube. A sealing plate seals the bottom end face of the thin-walled steel pipe 2, with the nut 21 secured in the middle of the sealing plate. The grouting pipe joint 42 prevents the grouting pipe 41 from disengaging during retrieval, allowing for segmented retrieval from top to bottom, and making installation and disassembly quick and convenient.

[0036] Furthermore, such as Figures 2-6As shown, the bottom end of the grouting pipe section 411 is provided with a bottom base 412, and the top end of the grouting pipe section 411 is provided with a top base 413 that matches the bottom base 412. The grouting pipe joint 42 includes a joint bracket 421, a screw 422, a linkage gear 423, a horizontal stabilizing bracket, and a rotating shaft 426. The joint bracket 421 is rotatably connected to the upper end of the grouting pipe section 411 located below via the rotating shaft 426. Its rotation axis is laterally oriented. The screw 422 is screwed onto the joint bracket 421. The linkage gear 423 is installed on the joint bracket 421 and abuts against the screw 422. By rotating the linkage gear 423, the screw 422 can be driven to rotate, causing the screw 422 to be screwed upwards or downwards. The horizontal stabilizing support includes a fixed part 424 and a rotating part 425. The fixed part 424 is fixed to the top of the joint support 421. One end of the rotating part 425 is hinged to one end of the fixed part 424. The other end of the rotating part 425 can be screwed to the other end of the fixed part 424 by fasteners. A snapping space is formed between the rotating part 425 and the fixed part 424 for snapping the grouting pipe section 411 located above. Specifically, when the upper and lower grouting pipe sections 411 need to be connected, the bottom base 412 of the upper grouting pipe section 411 is abutted against the top base 413 of the lower grouting pipe section 411. The sealing ring 427 is located between the bottom base 412 and the top base 413. The joint bracket 421, which is rotatably installed on the upper part of the lower grouting pipe section 411, is rotated to a vertical position. By rotating the linkage gear 423, the screw 422 is driven to screw downwards to abut against the bottom base 412 of the upper grouting pipe section 411, thus pressing the bottom base 412 of the upper grouting pipe section 411 tightly. On the one hand, this connects the two grouting pipe sections 411, and on the other hand, it makes the connection between the bottom base 412 of the upper grouting pipe section 411 and the top base 413 of the lower grouting pipe section 411 tighter. Then, the fixing part 424 of the horizontal stabilizing bracket abuts against the outer wall of the upper grouting pipe section 411. By rotating the rotating part 425 of the horizontal stabilizing bracket until it abuts against the outer wall of the upper grouting pipe section 411, a locking space is formed. The other end of the rotating part 425 and the fixing part 424 are fixed by tightening fasteners.

[0037] Furthermore, such as Figure 2 As shown, the grouting mechanism also includes a cement slurry distributor 43, a grouting hose 44, and a mud pump 45. The top end of the grouting pipe 41 is connected to the first end of the grouting hose 44 through the cement slurry distributor 43, and the second end of the grouting hose 44 is connected to the mud pump 45.

[0038] Furthermore, such as Figure 2 As shown, the lifting mechanism includes a winch 81 and a wire rope 82 wound around the winch 81. The winch 81 is fixed to the support 1, and the slewing mechanism 7 is suspended from the front of the support 1 by the wire rope 82.

[0039] Example 2:

[0040] like Figure 7 As shown, this embodiment provides a construction method for the novel steel pipe reinforced composite pile construction device of Embodiment 1, including the following steps:

[0041] S1. The thin-walled steel pipe 2 is clamped by the clamp 5, and expanded by the expander 6 to abut against the inner wall of the thin-walled steel pipe 2. The pre-prepared cement slurry is sprayed out from the grouting nozzle 31 through the grouting pipe 41 by the grouting mechanism. The thin-walled steel pipe 2 is driven to rotate by the rotary mechanism 7, which drives the mixing drill bit 3 to stir the cement slurry. At the same time, the thin-walled steel pipe 2 is lowered to the target depth by the lifting mechanism. Specifically, the pre-prepared cement slurry is introduced into the grouting pipe 41 through the grouting hose 44 by the cement pump. After flowing through the grouting pipe 41, the cement slurry is sprayed out from the grouting nozzle 31. During lifting, the wire rope 82 is wound up and down by the winch 81, which drives the rotary mechanism 7 to achieve lifting.

[0042] S2. The thin-walled steel pipe 2 is stopped rotating by the rotary mechanism 7, the expander 6 contracts and separates from the inner wall of the thin-walled steel pipe 2, the thin-walled steel pipe 2 is released by the clamp 5, the grouting mechanism is closed, the grouting pipe 41 is removed, and precast concrete is poured into the thin-walled steel pipe 2. Specifically, when removing the grouting pipe 41, the linkage gear 423 is rotated, which drives the screw 422 to rotate upward and away from the bottom base 412. The fasteners are tightened, so that the rotating part 425 of the horizontal stabilizing bracket separates from the other end of the fixed part 424.

[0043] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A steel pipe reinforced composite pile construction device, characterized in that, Includes support (1), thin-walled steel pipe (2), mixing drill bit (3), grouting mechanism, clamp (5), expander (6), rotary mechanism (7), and lifting mechanism; The rotary mechanism (7) is connected to the support (1) through the lifting mechanism. The rotary mechanism (7) is connected to the clamp (5). The clamp (5) clamps the thin-walled steel pipe (2). The stirring drill bit (3) is fixedly connected to the bottom end of the thin-walled steel pipe (2). The grouting pipe (41) of the grouting mechanism is located inside the thin-walled steel pipe (2). The grout outlet of the grouting pipe (41) is connected to the grouting nozzle (31) on the stirring drill bit (3). The expander (6) is sleeved on the grouting pipe (41), and the sleeved position of the expander (6) is flush with the clamp (5). The wall thickness of the thin-walled steel pipe (2) is 3~6mm, and the cross-sectional dimension of the upper part of the thin-walled steel pipe (2) is larger than the cross-sectional dimension of the lower part of the thin-walled steel pipe (2); The grouting pipe (41) is formed by connecting multiple grouting pipe sections (411) in sequence, and two adjacent grouting pipe sections (411) are connected by a grouting pipe joint (42); The bottom end of the grouting pipe section (411) is provided with a bottom end base (412), and the top end of the grouting pipe section (411) is provided with a top end base (413) that matches the bottom end base (412). The grouting pipe joint (42) includes a joint bracket (421), a screw (422), a linkage gear (423), a horizontal stabilizing bracket, and a rotating shaft (426). The joint bracket (421) is rotatably connected to the upper end of the grouting pipe section (411) via the rotating shaft (426), with its rotation axis oriented laterally. The screw (422) is screwed onto the joint bracket (421), and the linkage gear (423) is rotatably mounted on the joint bracket (421) and abuts against the screw (422). By rotating the linkage gear (423), the screw (422) can be driven to rotate, causing the screw (422) to be screwed upward or downward. The horizontal stabilizing support includes a fixed part (424) and a rotating part (425). The fixing part (424) is fixed to the top of the joint bracket (421). One end of the rotating part (425) is hinged to one end of the fixing part (424). The other end of the rotating part (425) can be screwed to the other end of the fixing part (424) by a fastener. A snapping space is formed between the rotating part (425) and the fixing part (424) for snapping the grouting pipe section (411) located above.

2. The steel pipe reinforced composite pile construction device as described in claim 1, characterized in that, The thin-walled steel pipe (2) is a segmented structure, which is formed by connecting multiple steel pipe sections in sequence, and the two adjacent steel pipe sections are fixedly connected.

3. The steel pipe reinforced composite pile construction device as described in claim 1, characterized in that, A sealing ring (427) is provided at the connection between two adjacent grouting pipe sections (411).

4. The steel pipe reinforced composite pile construction device as described in claim 1, characterized in that, Multiple anchoring strips are uniformly embedded on the outer wall of the thin-walled steel pipe (2).

5. The steel pipe reinforced composite pile construction device as described in claim 1, characterized in that, The stirring drill bit (3) is uniformly provided with multiple stirring blades (32).

6. The steel pipe reinforced composite pile construction device as described in claim 1, characterized in that, The grouting mechanism also includes a cement slurry distributor (43), a grouting hose (44), and a mud pump (45). The top end of the grouting pipe (41) is connected to the first end of the grouting hose (44) through the cement slurry distributor (43), and the second end of the grouting hose (44) is connected to the mud pump (45).

7. The steel pipe reinforced composite pile construction device as described in claim 1, characterized in that, The lifting mechanism includes a winch (81) and a wire rope (82) wound around the winch (81). The winch (81) is fixed to the support (1), and the slewing mechanism (7) is suspended from the front of the support (1) by the wire rope (82).

8. A construction method using the steel pipe reinforced composite pile construction device according to any one of claims 1-7, characterized in that, Including the following steps: S1. The thin-walled steel pipe (2) is clamped by the clamp (5), and the expansion device (6) expands to abut against the inner wall of the thin-walled steel pipe (2). The pre-made cement slurry is sprayed out from the grouting nozzle (31) through the grouting pipe (41) by the grouting mechanism. The thin-walled steel pipe (2) is driven to rotate by the rotary mechanism (7), which drives the stirring drill bit (3) to stir the cement slurry. At the same time, the thin-walled steel pipe (2) is lowered to the target depth by the lifting mechanism. S2. The thin-walled steel pipe (2) is stopped rotating by the rotary mechanism (7), the expander (6) contracts and separates from the inner wall of the thin-walled steel pipe (2), the thin-walled steel pipe (2) is released by the clamp (5), the grouting mechanism is closed, the grouting pipe (41) is removed, and precast concrete is poured into the thin-walled steel pipe (2).

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