Soft foundation cast-in-place pile reinforcement cage mounting device and construction method thereof

Abstract

The soft foundation cast-in-place pile reinforcement cage mounting device comprises a steel reel pile casing, and a worm gear rack lifting mechanism is mounted on the outer side of the steel reel pile casing; the steel reinforcement cage supporting rod control mechanism is mounted on the inner side of the steel reel pile casing, and a driving device and a driven device of the steel reinforcement cage supporting rod control mechanism are connected through a stainless steel sheet; the reinforcement cage bracket guide mechanism and the cam jacking mechanism are mounted on the inner side of the steel reel pile casing, and the self-locking mechanism is arranged in the cam jacking mechanism. A soft foundation cast-in-situ bored pile construction orifice is prone to collapse, a steel winding drum serves as a core of the device, a reinforcement cage guiding and fixing device is arranged on the inner side of the steel winding drum, a numerical control power assembly is installed on the upper portion of the steel winding drum, and the functions of levelness, perpendicularity and elevation positioning, guiding, installing and fixing of a soft foundation cast-in-situ bored pile reinforcement cage are achieved. And the overall project construction period is prolonged while the cast-in-place pile construction quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of a soft foundation bored pile reinforcement cage installation device, in particular to a soft foundation bored pile reinforcement cage installation device and a construction method thereof. Background Art

[0002] Mud-wall bored piles are a commonly used pile-forming method in China with a wide range of applications. They can be used in various geological conditions, various hole diameters and depths. The quality control of the construction process mainly includes hole opening, drilling, hole cleaning, steel cage installation, hole bottom cleaning, concrete pouring, etc. During the lowering process of the steel cage, due to the workers' rough operation, it is easy to bump into the mud wall, especially in soil layers with poor geology such as thick silt. The hole wall is easily disturbed and collapsed. In addition, the traditional steel cage horizontal, vertical and elevation positioning measures have low accuracy, which affects the quality of the mud-wall bored pile and the construction period.

[0003] The application number is CN118187056A, a cast-in-place pile casing device, cast-in-place pile and construction method, the cast-in-place pile casing device includes a plurality of casing units, a plurality of connecting rings and a limiting retaining spring, the casing unit is provided with more than three arc plate bodies, the plurality of arc plate bodies are connected end to end around the axis of the casing unit in the circumferential direction to form a cylindrical body, the limiting retaining spring is provided to be clamped on the inner side of the plurality of arc plate bodies, used to keep the plurality of arc plate bodies in the form of a cylindrical body, when the limiting retaining spring is separated from the inner side of the arc plate body, the arc plate bodies can be separated in the radial direction. The casing unit designed by the present invention includes a plurality of arc plate bodies distributed circumferentially around the cylinder, the connecting rings are installed at both ends and the limiting retaining spring is installed on the inner side, the casing unit structure can be stably inserted into the soil layer, after drilling, the limiting retaining spring can be released from the inner side to support the arc plate body, the plurality of arc plate bodies can be moved inward, the arc plate body can be separated from the soil layer, and it is easier to be pulled out.

[0004] The device has the problem that the electric clamp cannot be used normally to achieve quick extraction when the limit spring and connecting rope in the casing are covered by concrete pouring, and there are no quality assurance measures for the installation of the steel cage. When the casing is pulled out, the large contact area between the casing and the soil layer and concrete leads to high friction, making it difficult to pull out. In addition, if the casing is skewed, it will also damage the soil layer and the pile body.

[0005] The application number is CN115928742B. A lifting device for preventing steel cage deformation for mud wall bored pile construction. It includes a mobile platform, which is connected to a guide rail through an L-shaped bracket and a first rotating shaft. The guide rail is provided with a flipping mechanism for fixing the steel cage, the top plate is provided with a clamping mechanism for fastening the traction rope, the second fixed block is provided with a first adjustment mechanism for controlling the distance between the symmetrical first limit blocks, and the T-shaped load-bearing rail is provided with a second adjustment mechanism for controlling the distance between the first limit block and the top plate. By performing multi-point radial limiting on the steel cage, local deformation of the steel cage caused by uneven force when flipping the steel cage is avoided. The positioning roller radially limits the steel cage to avoid collision between the steel cage and the borehole wall during the lifting process. The support mechanism limits the steel cage axially and radially to prevent the position of the steel cage in the borehole from shifting and colliding with the borehole wall.

[0006] The device has high requirements for the flatness of the site. When lifting the steel cage vertically to the ground, the central axis of the steel cage and the central axis of the casing must be in a straight line. The precision requirement is high, and there is no measure to fix the steel cage when pouring concrete. It is necessary to overcome the problem that the steel cage is bent and deformed due to the horizontal force of the lifting point, thereby affecting the strength of the pile. The steel cage cannot be used when it is severely bent. The steel cage and the drill hole are difficult to be concentric. In severe cases, the steel cage collides with the drill hole wall, causing the steel cage to deform and lose its function. When multiple sections of the steel cage are connected, the uneven distribution of support points causes the steel cage to deflect, resulting in the connection process cannot proceed normally.

[0007] The application number is a bored cast-in-place pile reinforcement cage locator, which includes a locating ring, a locating cylinder is provided on the locating ring, a locating rod penetrating the locating cylinder is provided in the locating cylinder, the locating rod moves along the radial direction of the locating ring, a clamp is provided at the end of the locating rod, and the clamp is used to clamp the reinforcement cage; an air bag is provided on the outer circumferential surface of the locating ring, and the air bag can abut against the inner wall of the casing when it is inflated; a telescopic bag connected to the air bag is provided in the locating cylinder, and the telescopic bag can drive the movement of the locating rod when it is inflated. The bridge construction drilling and pouring construction method involved in this application includes the steps of pile position layout, casing burial, mud preparation, drilling, hole formation detection and hole cleaning, reinforcement cage installation, installation of bored cast-in-place pile reinforcement cage locator, and concrete pouring. The bored cast-in-place pile reinforcement cage locator involved in this application has the effect of improving the simplicity of positioning work.

[0008] The verticality of the steel cage of the device is greatly affected by the verticality of the casing. The steel cage is fixed by the air bag inflating and abutting against the inner wall of the casing to generate friction. For a cage with a large diameter, a long length and a heavy overall mass, the steel cage may slide down and cause quality defects in the formed cast-in-place pile body. It is necessary to solve the problem that the limiting steel bars of the steel cage of the bored cast-in-place pile cannot abut against the inner wall of the casing or the inner wall of the borehole well, so the limiting steel bars need to be corrected multiple times, which makes the positioning work not simple enough.

[0009] The present invention can realize segmented installation of steel cages and refined control of horizontality, verticality and elevation, thereby improving the quality of cast-in-place pile construction and shortening the overall construction period of the project, effectively solving the above-mentioned problems.

[0010] Therefore, we propose a soft foundation cast-in-place pile reinforcement cage installation device and a construction method thereof to solve the above-mentioned problems. Summary of the invention

[0011] The purpose of the present invention is to provide a device for placing and installing steel cages of bored piles in soft foundations and a construction method thereof, so as to solve the problems proposed in the above-mentioned background technology that the existing devices have no quality assurance measures for the placement and installation of steel cages, have high requirements for the alignment construction accuracy of the steel cages, have no anti-sinking cage and floating cage measures, and the level and elevation control of the devices are not easy to control.

[0012] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for placing a reinforcement cage of a bored pile in a soft foundation and a construction method thereof, comprising a steel drum casing, a worm gear rack lifting mechanism being installed on the outer side of the steel drum casing; a reinforcement cage support rod control mechanism being installed on the inner side of the steel drum casing, the active device and the driven device of the reinforcement cage support rod control mechanism being connected by a stainless steel sheet; a reinforcement cage bracket guide mechanism and a cam lifting mechanism being installed on the inner side of the steel drum casing, and a self-locking mechanism being arranged in the cam lifting mechanism; the reinforcement cage can be transmitted to the design specified elevation through the reinforcement cage support rod control mechanism and the reinforcement cage bracket guide mechanism, the telescopic rod is pushed outward through the cam lifting mechanism, and the device is self-locked through the upward force of the self-locking mechanism and the second spring.

[0013] Preferably, the worm gear rack lifting mechanism includes a worm wheel, a rack and a worm, the worm is rotatably connected to the inner side of the worm gear rack lifting mechanism, and the outer side of the worm is meshedly connected to the worm wheel, and the outer side of the worm wheel is meshedly connected to the rack, and the rack is fixedly connected to the outer side of the steel drum casing.

[0014] Preferably, the reinforcing cage support rod control mechanism comprises an annular pressure transmission member and a slide plate, the annular pressure transmission member is fixedly connected to the outside of the outer reinforcing cage support rod control mechanism, and the slide plate is fixedly connected to the outside of the annular pressure transmission member.

[0015] Preferably, the cam lifting mechanism comprises a telescopic rod and a first spring, the telescopic rod is slidably connected to the inner side of the cam lifting mechanism, and the first spring is connected between the telescopic rod and the cam lifting mechanism.

[0016] Preferably, the self-locking mechanism further includes a slide groove, a second spring, and a slide rod. The slide groove is opened on the inner side of the self-locking mechanism, and the slide rod is slidably connected to the inner side of the slide groove. The second spring is fixedly installed on the inner side of the slide groove, and the second spring and the slide rod are distributed correspondingly up and down.

[0017] A construction method for a soft foundation cast-in-place pile reinforcement cage installation device, comprising:

[0018] Step 1: Device positioning

[0019] According to the coordinates of the bored pile to be constructed, use the total station to measure the center of the pile hole and mark it with the steel bar head; select the steel drum casing with a diameter and length that meets the geological conditions of the site for bored pile construction;

[0020] Step 2: Bury the device

[0021] The length of the nylon line is the same as the radius of the steel drum casing. One end of the nylon line is tied to the center of the pile hole to locate the steel bar head. The other end of the nylon line draws an arc along a circular trajectory and sprinkles white lime to determine the plane positioning of the steel drum casing. Use a vibrating pile driver to align the steel drum casing with the white lime line and vibrate it to the specified elevation, and adjust the horizontal and vertical degree of the steel drum casing.

[0022] Step 3: Boring of cast-in-place piles

[0023] Step 4: Lifting the steel cage

[0024] Lift the first section of the steel cage, and control the elevation of the stiffening hoop at the upper end of the steel cage to 2-3cm above the telescopic rod of the steel cage bracket guide mechanism, leaving space for the telescopic rod to exit;

[0025] Step 5: Adjust the steel cage support rod

[0026] Press and release the control lever of the active device of the steel cage support rod control mechanism, the cam lifting mechanism is compressed, the slide plate slides down, the telescopic rod extends, and the steel cage support rod control mechanism is self-locking:

[0027] (4) The pulley at the end of the telescopic rod rolls along the upper edge of the slide plate, pushing the first spring to compress, and the telescopic rod extends. The groove at the front end of the telescopic rod is conducive to fixing the horizontal position of the steel cage;

[0028] (5) The slide plate slides down to transmit the pressure to the self-locking mechanism, the second spring is compressed, the free end of the slide rod slides along the slide groove 14 to the top groove, and the spring acts upward to force the device to self-lock;

[0029] (6) The active device and the driven device of the steel cage support rod control mechanism are connected by a stainless steel sheet, and the force transmission driven device moves in accordance with the active device; at this time, the three telescopic rods of the active device extend one rod, and the driven device extends two rods) in the same plane to point to the center of the steel cage support guide mechanism, and the steel cage is slowly lowered, and the first section of the steel cage is placed;

[0030] Step 6: Adjust the height of the steel cage joint

[0031] Control the worm gear rack lifting mechanism, rotate the rocker to drive the worm, the worm rotates to drive the worm gear, and the worm gear drives the rack to move up and down. In this way, the joint position of the upper and lower steel cages is adjusted, which is convenient for workers to weld or sleeve the upper and lower steel cages;

[0032] Step 7: Connect the steel cage and lower the cage

[0033] Lift the second steel cage and connect it reliably with the first steel cage; lift the entire steel cage 2-3cm, press the control rod of the steel cage support rod control mechanism, and retract the telescopic rod into the steel cage bracket guide mechanism; at this time, slowly sink the two lifted steel cages as a whole to the construction operation surface where the second and third steel cages are connected, press the control rod of the steel cage support rod control mechanism again, and extend the telescopic rod to set up and fix the entire steel cage again;

[0034] After the designed length of the steel cage is completed according to this method, the steel cage is fixed at the designed elevation through the worm gear rack lifting mechanism, and the concrete is poured after the second hole cleaning;

[0035] When the concrete is poured to about 85% of the designed volume, the position of the steel cage is fixed; adjust the worm gear rack lifting mechanism, lower the telescopic rod by 2-3cm, press the control rod of the steel cage support rod control mechanism, and retract the telescopic rod to the inside of the steel cage bracket guide mechanism; continue to control the worm gear rack lifting mechanism to lift the steel cage bracket guide mechanism to the top surface of the casing, and continue to pour concrete to the designed elevation of the pile top. When the concrete reaches a certain strength, use the pile driver to remove the casing, and the pile is completed.

[0036] Compared with the prior art, the invention has the following beneficial effects: the soft foundation cast-in-place pile reinforcement cage installation device and the construction method thereof:

[0037] (1) The integrally connected steel cage can be transferred to the specified elevation through the turbine rack lifting mechanism and axial bracket guide mechanism of the casing to ensure the construction quality at the pile head;

[0038] (2) Through the casing circumferential steel cage erection mechanism, when erecting the segmented steel cage and assisting the connection of the upper and lower sections of the steel cage, the steel cage can be lowered straight, avoiding damage to the steel cage due to collision with the mud wall during the lowering process, causing construction quality problems such as hole collapse, ensuring the thickness of the concrete protective layer outside the steel cage, improving the construction quality of the pile body, and accelerating the construction progress;

[0039] (3) Adjust the level, elevation and verticality of the casing. The steel cage inside the casing is erected at three points by support rods, and the support rods point radially to the center of the casing to ensure the verticality and horizontal position of the steel cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1This is the overall structural diagram of the soft foundation cast-in-place pile reinforcement cage installation device of the present invention;

[0041] Figure 2 It is the internal structure diagram of the casing of the present invention;

[0042] Figure 3 This is a structural diagram of the reinforcing cage support rod control mechanism-active device of the present invention;

[0043] Figure 4 This is a structural diagram of the reinforcing cage support rod control mechanism-driven device of the present invention;

[0044] Figure 5 This is a diagram showing the internal structure of the self-locking mechanism of the present invention;

[0045] Figure 6 This is the internal structure diagram of the worm gear rack lifting mechanism of the present invention;

[0046] Figure 7 It is a schematic diagram of the process of installing a reinforcement cage of a cast-in-place pile on a soft foundation in an embodiment of the present invention.

[0047] In the figure: 1. worm gear rack lifting mechanism; 2. reinforcement cage support rod control mechanism; 3. steel drum casing; 4. reinforcement cage bracket guide mechanism; 5. worm gear; 6. rack; 7. worm; 8. annular pressure transmission member; 9. cam lifting mechanism; 10. slide plate; 11. telescopic rod; 12. first spring; 13. self-locking mechanism; 14. slide groove; 15. second spring; 16. slide rod; 17. stainless steel sheet. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] See also Figure 1-Figure 7 The present invention provides a technical solution: a device for installing a steel cage of a cast-in-place pile in a soft foundation and a construction method thereof, comprising:

[0050] Embodiment 1: Figure 1-Figure 6 The technical solution shown in the figure, the present invention provides a technical solution: a soft foundation cast-in-place pile reinforcement cage installation device and a construction method thereof, which discloses: a steel drum casing 3, a worm gear rack lifting mechanism 1 is installed on the outer side of the steel drum casing 3; the worm gear rack lifting mechanism 1 drives the steel drum casing 3 to move up and down through the cooperation of the worm wheel 5 and the worm 7, so that the reinforcement cage is transmitted to the specified elevation;

[0051] The reinforcing cage supporting rod control mechanism 2 is installed inside the steel drum casing 3, and the active device and the driven device of the reinforcing cage supporting rod control mechanism 2 are connected through a stainless steel sheet 17; the active device and the driven device of the reinforcing cage supporting rod control mechanism 2 are connected through the stainless steel sheet 17, and the force transmission is realized through the connection of the stainless steel sheet 17, so that the active device and the driven device move in unison;

[0052] The steel cage bracket guide mechanism 4 and the cam lifting mechanism 9 installed on the inner side of the steel drum casing 3, and the self-locking mechanism 13 arranged in the cam lifting mechanism 9; the steel cage bracket guide mechanism 4 and the cam lifting mechanism 9 can ensure that the steel cage maintains verticality when it is at the bottom, avoiding collision and damage when it is at the bottom;

[0053] Through the steel cage support rod control mechanism 2 and the steel cage bracket guide mechanism 4, the steel cage can be transferred to the design specified elevation, the telescopic rod 11 is pushed outward by the cam lifting mechanism 9, and the device is self-locked by the upward force of the self-locking mechanism 13 and the second spring 15;

[0054] The worm gear rack lifting mechanism 1 includes a worm wheel 5 and a worm 7. The worm 7 is rotatably connected to the inner side of the worm gear rack lifting mechanism 1, and the outer side of the worm 7 is meshingly connected to the worm wheel 5. The rotation of the worm 7 drives the worm wheel 5 to rotate, which not only realizes the transmission of force, but also changes the direction of rotation.

[0055] The worm gear rack lifting mechanism 1 also includes a rack 6, which is meshed and connected to the outside of the worm wheel 5, and the rack 6 is fixedly connected to the outside of the steel drum casing 3; the rack 6 and the worm wheel 5 are meshed with each other, and when the worm wheel 5 rotates, the rack is driven to move together, thereby driving the connected steel drum casing 3 to move together;

[0056] The reinforcing cage supporting rod control mechanism 2 includes an annular pressure transmitting member 8, which is fixedly connected to the outside of the outer reinforcing cage supporting rod control mechanism 2; the annular pressure transmitting member 8 can transmit force;

[0057] The steel cage supporting rod control mechanism 2 also includes a slide plate 10, which is fixedly connected to the outer side of the annular pressure transmission member 8; when the slide plate 10 moves up and down, the telescopic rod 11 is pushed outward through the protruding tail on the outer side, thereby realizing the transmission of force;

[0058] The cam lifting mechanism 9 includes a telescopic rod 11, which is slidably connected to the inner side of the cam lifting mechanism 9; a first spring 12 is connected to the outer side of the telescopic rod 11, and the first spring 12 can reset the telescopic rod 11 by its own elastic force;

[0059] The cam lifting mechanism 9 also includes a first spring 12, and both ends of the first spring 12 are connected to the telescopic rod 11 and the cam lifting mechanism 9 respectively; the first spring 12 is connected to the middle part of the telescopic rod 11 and the cam lifting mechanism 9, which can not only realize the transmission of force but also play a certain buffering effect;

[0060] The self-locking mechanism 13 further includes a slide groove 14 and a slide rod 16. The slide groove 14 is provided inside the self-locking mechanism 13, and the slide rod 16 is slidably connected inside the slide groove 14.

[0061] The self-locking mechanism 13 further includes a second spring 15, which is fixedly connected to the inner side of the slide slot 14, and the second spring 15 and the slide bar 16 are arranged in correspondence with each other up and down; the slide bar 16 can be adjusted in position inside the slide slot to achieve self-locking;

[0062] This structure measures the center position of the pile hole according to the coordinate data of the pile position, selects the steel drum casing 3 of appropriate specifications (the inner diameter should be 400mm larger than the pile diameter), the length of the nylon line is the same as the radius of the steel drum casing 3, one end is tied to the center of the pile hole to locate the steel bar head, and white lime is sprinkled along the circular trajectory of the other end of the nylon line to determine the plane positioning of the steel drum casing 3. According to the shallow soil conditions of the pile position, a vibrating pile driver is used to align the steel drum casing 3 with the white lime line and vibrate it to the specified elevation, and the horizontal and vertical degrees of the steel drum casing 3 are adjusted. The first section of the steel cage is lifted, and the first section of the steel cage is extended by pressing the steel cage support rod control mechanism 2, and the telescopic rod 11 is erected on the inner side of the steel drum casing. After the steel cage support guide mechanism 4 is fixed, the second section of the steel cage is lifted and reliably connected to the first section of the steel cage. Press the steel cage support rod control mechanism 2, the telescopic rod 11 shrinks, and the two sections of the steel cage are hoisted and slowly sink to the construction operation surface where the second and third sections of the steel cage are connected. Press the steel cage support rod control mechanism 2 again, the telescopic rod 11 extends, and the steel cage is erected and fixed again. After the designed steel cage length is completed according to this method, the steel cage is fixed at the designed elevation through the worm gear rack lifting mechanism 1, and concrete is poured after the second hole cleaning.

[0063] Embodiment 2: Figure 7 As shown, the technical solution shown, the present invention provides a technical solution: a construction method of a soft foundation cast-in-place pile reinforcement cage installation device, discloses:

[0064] Step 1: Device positioning

[0065] According to the coordinates of the pile position of the bored pile to be constructed, the center position of the pile hole is measured with a total station and marked with a steel bar head; a steel drum casing 3 is selected for bored pile construction with a diameter and length that meets the site geological conditions that the inner diameter should be 400mm larger than the pile diameter;

[0066] Step 2: Bury the device

[0067] The length of the nylon line is the same as the radius of the steel drum casing 3. One end of the nylon line is tied to the center of the pile hole to locate the steel bar head. The other end of the nylon line draws an arc along a circular trajectory and sprinkles white lime to determine the plane positioning of the steel drum casing 3. Use a vibrating pile driver to align the steel drum casing 3 with the white lime line and vibrate it to the specified elevation, and adjust the horizontal and vertical degrees of the steel drum casing 3.

[0068] Step 3: Boring of cast-in-place piles

[0069] Step 4: Lifting the steel cage

[0070] Lift the first section of the steel cage, and control the elevation of the reinforcing hoop at the upper end of the steel cage to 2-3 cm above the telescopic rod 11 of the steel cage bracket guide mechanism 4, leaving space for the telescopic rod 11 to exit;

[0071] Step 5: Adjust the steel cage support rod

[0072] Press and release the control rod of the active device of the steel cage support rod control mechanism 2, the cam lifting mechanism 9 is compressed, the slide plate 10 slides down, the telescopic rod 11 extends, and the steel cage support rod control mechanism 2 is self-locking:

[0073] (7) The pulley at the end of the telescopic rod 11 rolls along the upper edge of the slide plate 10, pushing the first spring 12 to compress, and the telescopic rod 11 extends. The groove at the front end of the telescopic rod 11 is conducive to fixing the horizontal position of the steel cage;

[0074] (8) The slide plate 10 slides down to transmit the pressure to the self-locking mechanism 13, the second spring 15 is compressed, and the free end of the slide rod 16 slides along the slide groove 14 to the top groove, and the spring acts upward to force the device to self-lock;

[0075] (9) The active device and the driven device of the steel cage support rod control mechanism 2 are connected by a stainless steel sheet 17, and the force transmission driven device moves in accordance with the active device; at this time, the active device of the three-rod steel cage support rod control mechanism 2 of the telescopic rod 11 extends one rod, and the driven device extends two rods in the same plane to point to the center of the steel cage support guide mechanism 4, and the steel cage is slowly lowered, and the first section of the steel cage is placed;

[0076] Step 6: Adjust the height of the steel cage joint

[0077] Control the worm gear rack lifting mechanism 1, rotate the rocker to drive the worm 7, the worm 7 rotates to drive the worm gear 5 to rotate, and the worm gear 5 drives the rack 6 to move up and down. In this way, the joint position of the upper and lower steel cages is adjusted, which is convenient for workers to weld or sleeve the upper and lower steel cages according to process requirements;

[0078] Step 7: Connect the steel cage and lower the cage

[0079] Lift the second steel cage and connect it reliably with the first steel cage; lift the entire steel cage 2-3 cm, press the control rod of the steel cage support rod control mechanism 2, and the telescopic rod 11 will be retracted into the steel cage bracket guide mechanism 4; at this time, slowly sink the two lifted steel cages as a whole to the construction operation surface where the second steel cage and the third steel cage are connected, press the control rod of the steel cage support rod control mechanism 2 again, and the telescopic rod 11 will be extended to set up and fix the steel cage as a whole again;

[0080] (1) After the designed length of the steel cage is completed according to this method, the steel cage is fixed at the designed elevation by the worm gear rack lifting mechanism 1, and the concrete is poured after the secondary hole cleaning;

[0081] (2) When the concrete is poured to about 85% of the designed volume and does not exceed the bottom elevation of the casing, the position of the steel cage is fixed; adjust the worm gear rack lifting mechanism 1, the telescopic rod 11 is lowered by 2-3 cm, and the control rod of the steel cage support rod control mechanism 2 is pressed, and the telescopic rod 11 is retracted to the inside of the steel cage bracket guide mechanism 4; continue to control the worm gear rack lifting mechanism 1 to lift the steel cage bracket guide mechanism 4 to the top surface of the casing, and continue to pour concrete to the designed elevation of the pile top. When the concrete reaches a certain strength, the pile driver is used to remove the casing, and the pile is completed.

[0082] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0083] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for installing a steel cage of a cast-in-place pile in a soft foundation, characterized in that: include: A steel drum casing (3), wherein a worm gear rack lifting mechanism (1) is installed on the outer side of the steel drum casing (3); A reinforcing cage support rod control mechanism (2) installed inside the steel drum casing (3), wherein the active device and the passive device of the reinforcing cage support rod control mechanism (2) are connected via a stainless steel sheet (17); A steel cage bracket guide mechanism (4) and a cam lifting mechanism (9) installed inside the steel drum casing (3), and a self-locking mechanism (13) arranged inside the cam lifting mechanism (9); The steel cage support rod control mechanism (2) and the steel cage support guide mechanism (4) can be used to transfer the steel cage to a designated elevation, the telescopic rod (11) can be pushed outwards by the cam lifting mechanism (9), and the device can be self-locked by the upward force of the self-locking mechanism (13) and the second spring (15).

2. The soft foundation cast-in-place pile reinforcement cage installation device according to claim 1 is characterized by: The worm gear rack lifting mechanism (1) comprises a worm wheel (5) and a worm (7); the worm (7) is rotatably connected to the inner side of the worm gear rack lifting mechanism (1), and the outer side of the worm (7) is meshingly connected to the worm wheel (5).

3. The soft foundation cast-in-place pile reinforcement cage installation device according to claim 2 is characterized by: The worm gear rack lifting mechanism (1) also includes a rack (6), the rack (6) is meshedly connected to the outside of the worm gear (5), and the rack (6) is fixedly connected to the outside of the steel drum casing (3).

4. A device for placing a reinforcement cage of a cast-in-place pile in a soft foundation according to any one of claims 1 to 3, characterized in that: The reinforcing cage supporting rod control mechanism (2) comprises an annular pressure transmission member (8), and the annular pressure transmission member (8) is fixedly connected to the outside of the outer reinforcing cage supporting rod control mechanism (2).

5. The soft foundation cast-in-place pile reinforcement cage installation device according to claim 4 is characterized by: The reinforcing cage supporting rod control mechanism (2) further comprises a slide plate (10), wherein the slide plate (10) is fixedly connected to the outside of the annular pressure transmission member (8).

6. A soft foundation cast-in-place pile reinforcement cage installation device according to any one of claims 1 to 3, characterized in that: The cam lifting mechanism (9) comprises a telescopic rod (11), and the telescopic rod (11) is slidably connected to the inner side of the cam lifting mechanism (9).

7. The device for placing a reinforcement cage of a cast-in-place pile in a soft foundation according to claim 6, characterized in that: The cam lifting mechanism (9) further comprises a first spring (12), and two ends of the first spring (12) are respectively connected to the telescopic rod (11) and the cam lifting mechanism (9).

8. The device for installing a steel cage of a cast-in-place pile in a soft foundation according to claim 1, characterized in that: The self-locking mechanism (13) further comprises a slide groove (14) and a slide rod (16); the slide groove (14) is arranged inside the self-locking mechanism (13), and the slide rod (16) is slidably connected to the inside of the slide groove (14).

9. The device for installing a steel cage of a cast-in-place pile in a soft foundation according to claim 8, characterized in that: The self-locking mechanism (13) further comprises a second spring (15), wherein the second spring (15) is fixedly connected to the inner side of the slide groove (14), and the second spring (15) and the slide rod (16) are arranged in a corresponding manner up and down.

10. A method for installing a reinforcement cage installation device for cast-in-place piles on a weak foundation, which is implemented by using a reinforcement cage installation device for cast-in-place piles on a weak foundation as claimed in any one of claims 1 to 9, comprising: Step 1: Device positioning According to the coordinates of the bored pile to be constructed, the center position of the pile hole is measured with a total station and marked with a steel bar head; a steel drum casing (3) is selected with a diameter and length that meets the geological conditions of the site (the inner diameter should be 400 mm larger than the pile diameter) for bored pile construction; Step 2: Bury the device The length of the nylon line is the same as the radius of the steel drum casing (3). One end of the nylon line is tied to the center of the pile hole to locate the steel bar head. The other end of the nylon line draws an arc along a circular trajectory and sprinkles white lime to determine the plane positioning of the steel drum casing (3). A vibrating pile driver is used to align the steel drum casing (3) with the white lime line and vibrate it to a specified elevation, and the horizontal and vertical degrees of the steel drum casing (3) are adjusted. Step 3: Boring of cast-in-place piles Step 4: Lifting the steel cage Lift the first section of the steel cage, and control the elevation of the reinforcing hoop at the upper end of the steel cage to 2-3 cm above the telescopic rod (11) of the steel cage bracket guide mechanism (4), leaving space for the telescopic rod (11) to exit; Step 5: Adjust the steel cage support rod The control rod of the active device of the steel cage support rod control mechanism (2) is pressed and released, the cam lifting mechanism (9) is compressed, the slide plate (10) slides down, the telescopic rod (11) extends, and the steel cage support rod control mechanism (2) is self-locked: (1) The pulley at the end of the telescopic rod (11) rolls along the upper edge of the slide plate (10), pushing the first spring (12) to be compressed, and the telescopic rod (11) is extended. The groove at the front end of the telescopic rod (11) is conducive to fixing the horizontal position of the steel cage; (2) The slide plate (10) slides down to transmit the pressure to the self-locking mechanism (13), the second spring (15) is compressed, and the free end of the slide rod (16) slides along the slide groove 14 to the top groove, and the spring acts upward to force the device to self-lock; (3) The active device and the passive device of the steel cage support rod control mechanism (2) are connected through a stainless steel sheet (17), and the action of the passive device in force transmission is consistent with that of the active device; at this time, the three rods of the telescopic rod (11) (one rod of the active device of the steel cage support rod control mechanism (2) and two rods of the passive device) are pointed to the center of the steel cage support guide mechanism (4) in the same plane, and the steel cage is slowly lowered, and the first section of the steel cage is placed; Step 6: Adjust the height of the steel cage joint The worm gear rack lifting mechanism (1) is controlled, and the rocker is rotated to drive the worm (7), and the rotation of the worm (7) drives the worm gear (5) to rotate, and the worm gear (5) then drives the rack (6) to move up and down. In this way, the joint position of the upper steel cage and the lower steel cage is adjusted, which is convenient for workers to weld or sleeve the upper and lower steel cages; Step 7: Connect the steel cage and lower the cage Lift the second steel cage and connect it reliably with the first steel cage; lift the entire steel cage by 2-3 cm, press the control rod of the steel cage support rod control mechanism (2), and retract the telescopic rod (11) into the steel cage support guide mechanism (4); then slowly sink the two lifted steel cages as a whole to the construction operation surface where the second steel cage and the third steel cage are connected, press the control rod of the steel cage support rod control mechanism (2) again, and extend the telescopic rod (11) to erect and fix the entire steel cage again; (1) After the designed steel cage length is completed according to this method, the worm gear rack lifting mechanism (1) Fix the steel cage at the designed elevation and pour concrete after secondary hole cleaning; (2) When the concrete is poured to about 85% of the designed volume, the position of the steel cage has been fixed; The worm gear rack lifting mechanism (1) is adjusted, the telescopic rod (11) is lowered by 2-3 cm, and the control rod of the steel cage support rod control mechanism (2) is pressed, so that the telescopic rod (11) is retracted into the interior of the steel cage support guide mechanism (4); After the worm gear rack lifting mechanism (1) is continuously controlled to lift the steel cage bracket guide mechanism (4) to the top surface of the casing, the concrete is continuously poured to the designed elevation of the pile top. After the concrete reaches a certain strength, the casing is removed by a pile driver, and the pile formation is completed.

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