Low-permeability deep soft soil foundation cement mixing pile reinforcing construction device

Abstract

The invention provides a low-permeability deep soft soil foundation cement mixing pile reinforcing construction device, and relates to the technical field of engineering pile construction, the low-permeability deep soft soil foundation cement mixing pile reinforcing construction device comprises a steel pile pipe, the steel pile pipe is of a hollow structure, and a plurality of grouting holes are formed in the side wall of the steel pile pipe at intervals; the sealing covers are arranged in one-to-one correspondence with the grouting holes, and each sealing cover is fixedly arranged on the outer side of the corresponding grouting hole; wherein the sealing cover is of a spiral conical structure, a locking assembly is arranged on the sealing cover, and the sealing cover has a first state and a second state. The technical problems that in low-permeability deep soft soil foundation construction, side wall holes are prone to being blocked by soft soil, and soil flows backwards into the pile body through the side wall holes can be effectively restrained and improved, so that the stability of the grouting process and the purity of cement paste are guaranteed, and the pile forming quality of the cement mixing pile and the overall construction reliability are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of engineering pile construction technology, and more specifically, to a cement mixing pile reinforcement construction device for deep soft soil foundations with low permeability. Background Technology

[0002] In the treatment of deep, low-permeability soft soil foundations, cement-mixing piles are widely used due to their strong adaptability and stable reinforcement effect. Current construction methods typically employ hollow steel piles as the pile formation and pouring channel. Simultaneously with the insertion of the steel pile into the foundation, supporting equipment is used to extract or remove the soft soil inside the pile, allowing it to gradually sink to the designed depth. Cement grout or cement mixture is then poured into the pile to form a cement-mixing pile. To address the issues of poor lateral permeability and insufficient pile-soil bonding in low-permeability soft soils, some construction schemes pre-drill several grouting sidewall holes on the sidewalls of the hollow steel pile. This allows the cement grout to diffuse laterally into the surrounding soil during pouring, thereby improving the overall foundation reinforcement effect.

[0003] However, the inventors discovered during actual construction that, due to the generally high water content, loose structure, and high fluidity of deep, low-permeability soft soil, during the process of inserting the steel pile into the foundation and simultaneously removing soil, the surrounding soft soil is easily squeezed into the sidewall holes of the steel pile under the influence of earth pressure and construction disturbance. This causes the grouting sidewall holes to be blocked by soil, making it difficult to achieve the expected lateral grouting effect. At the same time, when cement grout is subsequently poured into the steel pile, some sidewall holes may also become channels for external soil to enter the hollow steel pile from the back, causing the mud and cement grout to mix. This not only disrupts the mix ratio and uniformity of the cement grout but also leads to insufficient pile compaction and increased strength dispersion, thereby affecting the overall reinforcement effect and engineering safety of the cement-mixed pile. Summary of the Invention

[0004] The purpose of this invention is to provide a construction device for reinforcing cement mixing piles in deep soft soil foundations with low permeability. This device can effectively suppress and improve the technical problems of sidewall holes being easily blocked by soft soil and soil flowing back into the pile body through the sidewall holes during the construction of deep soft soil foundations with low permeability. This ensures the stability of the grouting process and the purity of the cement grout, and significantly improves the pile formation quality and overall construction reliability of cement mixing piles.

[0005] This invention is achieved through the following technical solution: A construction device for reinforcing deep soft soil foundations with cement mixing piles with low permeability includes: The steel pile pipe is a hollow structure with multiple grouting holes spaced apart on its sidewalls. A sealing cover is provided, which is respectively provided in correspondence with each of the grouting holes, and each sealing cover is fixedly provided on the outside of the corresponding grouting hole; The enclosure has a spiral conical structure, a locking component is provided on the enclosure, and the enclosure has a first state and a second state. In the first state, the locking component restricts the enclosure to a spirally stacked, closed state along the axial direction, so that the enclosure as a whole is conical and covers the corresponding grouting hole; In the second state, the locking component releases the restriction on the sealing cover, and the sealing cover undergoes elastic or plastic deformation and expands outward under the pressure generated by the cement grout pouring inside the steel pile pipe, forming an outwardly unfolding spiral sheet structure, so that the grouting hole is in a connected state.

[0006] Furthermore, the spiral gap portion of the enclosure is provided with interlocking inserts and slots.

[0007] Furthermore, multiple steel wire ropes are slidably embedded in the inner wall of the enclosure along the circumference. The distal end of the steel wire rope is fixedly set at the tip of the enclosure, and the proximal end of the steel wire rope is a movable end that is slidably set inside the steel pile pipe.

[0008] Furthermore, the movable end of the wire rope is fixedly provided with an anti-detachment end.

[0009] Furthermore, the locking assembly includes an inner support and a rotating rod. The inner support includes multiple support plates and a connecting rod. The multiple support plates are arranged in a conical frame around the periphery and are used to support the inner side of the enclosure. The connecting rod is fixedly connected to the support plates. The rotating rod is rotatably mounted on the connecting rod. The end of the rotating rod has a slot. The slot is stepped. A fixing post is fixedly mounted on the inner side of the tip of the enclosure. A locking block is fixedly mounted on the periphery of the fixing post. The groove of the stepped part with a smaller diameter has a movable slot for the locking block to move in or out. The locking block can move into the movable slot and engage with the groove of the stepped part with a larger diameter.

[0010] Furthermore, the locking assembly also includes a drive motor, which is fixedly mounted on the connecting rod and coaxially fixedly connected to the rotating rod.

[0011] Furthermore, a pull ring is fixedly provided on the drive motor, the support plate, or the connecting rod.

[0012] Furthermore, the tip of the enclosure is angled downwards.

[0013] Furthermore, the cross-section of the insert is square.

[0014] Furthermore, four steel wire ropes are evenly slidably embedded in the inner wall of the enclosure along the circumference.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: 1. This invention, by installing a spiral conical sealing cover on the outside of each grouting hole of the steel pile pipe, ensures that the grouting holes remain under control throughout the construction process of inserting the steel pile pipe into a deep, low-permeability soft soil foundation and continuously remaining within the soil layer. In the first state, the sealing cover has a conical structure that allows its conical outer contour to smoothly penetrate the soft soil layer during the sinking and positioning of the steel pile pipe, reducing disturbance and resistance to the surrounding soil. At the same time, it effectively shields the grouting holes, preventing high-water-content, highly fluid soft soil from entering the grouting holes under lateral earth pressure and causing blockage or backflow. This ensures the relative sealing and stability of the internal space of the steel pile pipe throughout the entire reinforcement construction stage.

[0016] 2. This invention, during the concrete pouring stage, releases the locking component from the sealing cover. Under the pressure of the concrete inside the steel pile pipe, the sealing cover expands outward. Its spiral structure, during this expansion, radially and axially expands the soft soil outside the grouting hole, increasing the effective space for concrete overflow and filling. This facilitates the full entry and filling of the surrounding area to be reinforced. Simultaneously, the expanded spiral structure and the poured concrete together form a composite force-bearing system similar to reinforced concrete, effectively constraining and reinforcing the outer side of the pile, thereby improving the overall bearing capacity, deformation resistance, and long-term reinforcement stability of the cement mixing pile. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of a cement mixing pile reinforcement construction device for deep soft soil foundation with low permeability provided by the present invention; Figure 2 A partial sectional view of a cement mixing pile reinforcement construction device for deep soft soil foundation with low permeability provided by the present invention; Figure 3 for Figure 2 Enlarged view of section A in the middle; Figure 4 A partial schematic diagram of a cement mixing pile reinforcement construction device for deep soft soil foundation with low permeability provided by the present invention; Figure 5 This invention aims to illustrate the structure of the fixing post, the locking block, and the insert strip; Figure 6 This is a schematic diagram illustrating the structure of the locking component. Reference numerals: 100-steel pile pipe, 110-grouting hole, 200-enclosed cover, 210-first state, 220-second state, 201-insertion strip, 202-slot, 203-fixed column, 2031-block, 300-locking assembly, 310-inner support, 311-support plate, 312-connecting rod, 320-rotating rod, 321-slot, 3211-moving slot, 330-drive motor, 400-wire rope, 410-moving end, 411-anti-detachment end, 500-pull ring. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] The following is for reference Figures 1-6 As shown in the figure, and further explained with reference to specific embodiments, this embodiment provides a cement mixing pile reinforcement construction device for low-permeability deep soft soil foundation, including a steel pile pipe 100. The steel pile pipe 100 is a hollow structure, which can be integrally formed by steel or welded to take into account both settlement strength and long-term service stability.

[0021] The sidewall of the steel pile pipe 100 is provided with multiple grouting holes 110 spaced apart along its axial and / or circumferential directions. The diameter, spacing, and arrangement of the grouting holes 110 can be set according to the foundation depth, soft soil thickness, and designed reinforcement range to meet the outward expansion requirements of concrete at different depths and directions. After construction, the steel pile pipe 100 is permanently left in the soil layer, forming a composite reinforcement structure together with the cement mixing pile formed by pouring.

[0022] Each sealing cover 200 is correspondingly installed with one of the grouting holes 110, and each sealing cover 200 is fixedly installed on the outside of the corresponding grouting hole 110. The sealing cover 200 can be reliably connected to the steel pile pipe 100 by welding or integral molding. The sealing cover 200 has a spiral conical structure and is equipped with a locking component 300. The sealing cover 200 has a first state 210 and a second state 220. In the first state 210, the locking component 300 restricts the sealing cover 200 to a spirally stacked and closed state along the axial direction, so that the sealing cover 200 is conical in shape and tightly covers the corresponding grouting hole 110. This structure not only facilitates the smooth insertion of the steel pile pipe 100 into the low-permeability, deep soft soil layer and reduces insertion resistance, but also effectively prevents soft soil from entering the grouting hole 110 during the sinking and positioning of the steel pile, thereby avoiding premature blockage of the grouting hole 110 or the formation of a soil backflow channel.

[0023] In the second state 220, the locking component 300 releases the restriction on the sealing cover 200. Under the pressure generated by the cement grout pouring inside the steel pile pipe 100, the sealing cover 200 undergoes elastic or plastic deformation outward and gradually expands, forming an outwardly unfolding spiral plate-like structure, thus connecting the grouting hole 110. During the outward expansion process, the spiral plate-like structure can exert a radial expansion effect on the soil outside the grouting hole 110, thereby expanding the effective space for concrete overflow and filling, facilitating the smooth entry of concrete into the surrounding area to be reinforced. At the same time, the unfolded spiral structure and the poured concrete wrap around each other and work together to bear the force, forming a composite reinforcement system similar to the collaborative work of steel bars and concrete, thereby improving the overall bearing capacity and deformation resistance of the cement mixing pile.

[0024] Reference Figure 3 and Figure 5 As shown, the spiral gap portion of the enclosure 200 is provided with interlocking inserts 201 and slots 202. The cross-section of the insert 201 is square, but in other embodiments it can be a wedge-shaped or trapezoidal structure. Through the interlocking of the insert 201 and the slot 202, the enclosure 200 can maintain a stable spiral stacking shape in the first state 210, preventing unexpected deployment during the sinking of the steel pile; in the second state 220, the insert 201 can gradually detach from the slot 202 under the action of external force, achieving controlled deployment, thereby ensuring structural stability while also taking into account the smoothness and reliability of deployment.

[0025] Reference Figure 2As shown, multiple steel wire ropes 400 are slidably embedded in the inner wall of the enclosure 200 along the circumference. The steel wire ropes 400 can be made of high-strength steel wire or corrosion-resistant steel strand to meet the durability and stress requirements for long-term burial in underground environments. The distal end of the steel wire rope 400 is fixedly welded to the tip of the enclosure 200, so that it can participate in the stress along with the enclosure 200 as a whole. The proximal end of the steel wire rope 400 is a movable end 410 and is slidably set inside the steel pile pipe 100. Thus, during the process of the enclosure 200 unfolding from the first state 210 to the second state 220, the deformation stroke and unfolding range of the enclosure 200 are effectively constrained.

[0026] Regarding the installation of the wire rope 400, before assembling the enclosure 200 and the steel pile pipe 100, through holes can be pre-drilled on the side wall of the enclosure 200 and the corresponding position of the steel pile pipe 100 using a drilling rig and drill bit. The wire rope 400 is then sequentially inserted into the through holes and fixed before the overall installation of the device, thereby achieving the early installation of the wire rope 400, avoiding the need for re-insertion in subsequent construction stages, improving installation efficiency and ensuring the reliability of the structural layout.

[0027] In this embodiment, four steel wire ropes 400 are evenly slidably embedded in the inner wall of the enclosure 200 along the circumference. This ensures that when the enclosure 200 unfolds outward under the pressure of concrete pouring, the force in each direction is more balanced, effectively preventing local bulging or excessive deformation, thus guaranteeing the stability and symmetry of the unfolding spiral sheet structure. After the concrete is poured and hardened, the steel wire ropes 400 are completely covered and fixed inside the pile body, forming a composite structure that works synergistically with the concrete. On the one hand, this provides additional constraint and reinforcement to the unfolded enclosure 200; on the other hand, it improves the overall tensile, crack, and deformation resistance of the cement mixing pile, thereby further enhancing the long-term bearing capacity and reliability of the low-permeability, deep soft soil foundation reinforcement structure.

[0028] Furthermore, the movable end 410 of the wire rope 400 is fixedly equipped with an anti-detachment end 411. The anti-detachment end 411 can be a thickened end, a limiting block, or a welded ball head structure to prevent the enclosure 200 from being expanded too much, and at the same time to prevent the wire rope 400 from accidentally coming off the steel pile pipe 100 during construction or deployment, thus ensuring construction safety and structural integrity.

[0029] Reference Figures 2-5As shown, the locking assembly 300 includes an inner support 310 and a rotating rod 320. The inner support 310 includes four support plates 311 and a connecting rod 312. The four support plates 311 are arranged in a conical frame along the circumference and are used to support the inner side of the enclosure 200, so that the enclosure 200 maintains a stable conical structure in the first state 210. The connecting rod 312 is fixedly connected to the support plates 311 and is used to transmit the locking and unlocking actions as a whole. The rotating rod 320 is rotatably mounted on the connecting rod 312. The end of the rotating rod 320 is provided with a slot 321, which is stepped. A fixing post 203 is fixedly welded to the inner side of the tip of the enclosure 200, and a locking block 2031 is fixedly provided on the peripheral wall of the fixing post 203.

[0030] The groove of the smaller diameter stepped portion of the slot 321 has a movable groove 3211 for the locking block 2031 to move in or out. The locking block 2031 can move into the movable groove 3211 and engage with the groove of the larger diameter stepped portion of the slot 321, thereby achieving a locking connection between the inner support 310 and the enclosure 200. By driving the rotating rod 320 to rotate a certain angle, the locking block 2031 is aligned with the slot 321, which allows the locking block 2031 to disengage from the groove of the larger diameter stepped portion of the slot 321, thus achieving a reliable disengagement between the inner support 310 and the enclosure 200.

[0031] As an optional embodiment, in order to achieve automated control, the locking component 300 also includes a drive motor 330. The drive motor 330 is fixedly mounted on the connecting rod 312 and coaxially fixedly connected to the rotating rod 320. The rotation angle of the rotating rod 320 is controlled by the forward and reverse rotation of the motor, thereby realizing automated control of the state switching of the enclosure 200, reducing the difficulty of manual intervention, and improving construction efficiency and consistency.

[0032] As an optional embodiment, a pull ring 500 is fixedly provided on the drive motor 330, the support plate 311, or the connecting rod 312. In this embodiment, the pull ring 500 is fixedly connected to the housing of the drive motor 330. In actual use, the pull ring 500 can be hooked and connected with the hook of the pull rope. By pulling the pull rope from the outside of the steel pile pipe 100, the inner support 310 can be pulled out of the enclosure 200 and out of the steel pile pipe 100 after the drive motor 330 unlocks the inner support 310.

[0033] In different embodiments, the tip of the enclosure 200 is inclined downward. After the inner support 310 is separated from the enclosure 200, this structure can prevent the inner support 310 from getting stuck inside the enclosure 200 due to structural interference, thereby ensuring that the inner support 310 can be smoothly pulled out along the axial direction of the steel pile pipe 100, further improving the controllability and stability of the construction process.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A construction device for reinforcing deep soft soil foundations with cement mixing piles, characterized in that, include: The steel pile pipe (100) is a hollow structure, and its side wall is provided with a plurality of grouting holes (110) at intervals. A sealing cover (200) is provided in a one-to-one correspondence with each of the grouting holes (110), and each sealing cover (200) is fixedly provided on the outside of the corresponding grouting hole (110); The enclosure (200) has a spiral conical structure, and a locking component (300) is provided on the enclosure (200). The enclosure (200) has a first state (210) and a second state (220). In the first state (210), the locking component (300) restricts the enclosure (200) to a spirally stacked, closed state along the axial direction, so that the enclosure (200) is conical in shape and covers the corresponding grouting hole (110). In the second state (220), the locking component (300) releases the restriction on the sealing cover (200), and the sealing cover (200) undergoes elastic or plastic deformation and expands outward under the pressure generated by the cement grout pouring in the steel pile pipe (100), forming an outwardly unfolding spiral plate structure so that the grouting hole (110) is in a connected state.

2. The construction device for reinforcing low-permeability, deep soft soil foundation cement mixing piles according to claim 1, characterized in that, The spiral gap portion of the enclosure (200) is provided with interlocking inserts (201) and slots (202).

3. The construction device for reinforcing low-permeability, deep soft soil foundation cement mixing piles according to claim 1, characterized in that, The inner wall of the enclosure (200) is slidably embedded with multiple steel wire ropes (400) in the circumferential direction. The far end of the steel wire rope (400) is fixedly set at the tip of the enclosure (200), and the near end of the steel wire rope (400) is a movable end (410) and is slidably set in the steel pile pipe (100).

4. The cement mixing pile reinforcement construction device for low-permeability deep soft soil foundation according to claim 3, characterized in that, The movable end (410) of the wire rope (400) is fixedly provided with an anti-detachment end (411).

5. The cement mixing pile reinforcement construction device for low-permeability deep soft soil foundation according to claim 1, characterized in that, The locking assembly (300) includes an inner support (310) and a rotating rod (320). The inner support (310) includes multiple support plates (311) and a connecting rod (312). The multiple support plates (311) are arranged in a conical frame around the periphery and are used to support the inner side of the enclosure (200). The connecting rod (312) is fixedly connected to the support plates (311). The rotating rod (320) is rotatably mounted on the connecting rod (312). The end of the rotating rod (320) is provided with a slot (321). The slot (321) is stepped. A fixing post (203) is fixedly installed on the inner side of the tip of the closed cover (200). A locking block (2031) is fixedly installed on the peripheral wall of the fixing post (203). The slot of the smaller diameter stepped part of the slot (321) has a movable groove (3211) for the locking block (2031) to move in or out. The locking block (2031) can move into the movable groove (3211) and lock into the slot of the larger diameter stepped part of the slot (321).

6. The construction device for reinforcing low-permeability, deep soft soil foundation cement mixing piles according to claim 5, characterized in that, The locking assembly (300) also includes a drive motor (330), which is fixedly mounted on the connecting rod (312) and coaxially fixedly connected to the rotating rod (320).

7. The cement mixing pile reinforcement construction device for low-permeability deep soft soil foundations according to claim 6, characterized in that, A pull ring (500) is fixedly provided on the drive motor (330), the support plate (311), or the connecting rod (312).

8. The construction device for reinforcing low-permeability, deep soft soil foundations with cement mixing piles according to claim 1, characterized in that, The tip of the enclosure (200) is angled downwards.

9. The construction device for reinforcing low-permeability, deep soft soil foundation cement mixing piles according to claim 2, characterized in that, The cross-section of the insert (201) is square.

10. The construction device for reinforcing low-permeability, deep soft soil foundation cement mixing piles according to claim 3, characterized in that, The inner wall of the enclosure (200) is uniformly fitted with four steel wire ropes (400) along the circumference.

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