Bored pile and construction method

Abstract

The application discloses a cast-in-place pile and a construction method, which comprise a cast-in-place pile body and a reinforcing air bag, the cast-in-place pile body is poured on a foundation along a vertical direction, and the reinforcing air bag is in communication with the cast-in-place pile body through a tendon and surrounds the cast-in-place pile body in a circumferential direction. The cast-in-place pile and the construction method solve the problems of low hole-forming efficiency, slow construction speed, large material consumption and limited use range of the current cast-in-place pile, and have important significance for infrastructure construction, composite foundation reinforcement and pile foundation engineering in China.

Description

Technical Field

[0001] The present invention relates to the field of cast-in-place pile construction, and in particular to a cast-in-place pile and a construction method. Background Art

[0002] Rigid pile composite foundation reinforcement typically involves driving or casting a uniform distribution of rigid piles into the foundation. The piles' ends exert load-bearing force through friction with the sidewalls, thereby increasing the foundation's overall bearing capacity. In recent years, many high-speed railway and highway infrastructure projects have employed this method for composite foundation reinforcement, achieving positive results. However, solid piles require a large amount of concrete and are relatively expensive. The recent development of a range of specialized pile types has effectively addressed this issue. For example, large-diameter hollow pipe piles, X-shaped piles, and Y-shaped piles conserve concrete and effectively improve the bearing and deformation capacity of rigid pile composite foundations. In line with this trend, it is crucial to continue exploring composite foundation reinforcement methods with higher bearing capacity and lower construction costs. New composite foundation reinforcement piles must offer material savings, high bearing capacity, and convenient construction.

[0003] Therefore, in view of the current characteristics of pile foundation reinforcement in soft soil areas in my country, such as limited depth and bearing capacity, large amount of material used, low equipment automation rate, and complex construction operations, a bored pile and construction method is needed that can solve the current problems of low bored pile drilling efficiency, slow construction speed, large amount of material consumption, and limited scope of use. It is of great significance to my country's infrastructure construction, composite foundation reinforcement, and pile foundation engineering. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to overcome the defects in the prior art and provide cast-in-place piles and construction methods, which can solve the current problems of low bored pile hole efficiency, slow construction speed, large amount of consumables, and limited scope of use. It is of great significance to my country's infrastructure construction, composite foundation reinforcement, and pile foundation engineering.

[0005] The bored pile and construction method of the present invention include a bored pile body and a reinforcing air bag. The bored pile body is cast on the foundation along the vertical direction. The reinforcing air bag surrounds the bored pile body and is connected to the bored pile body through the Achilles tendon.

[0006] Furthermore, the reinforcement airbags are multiple and surround the circumference of the bored pile body.

[0007] Furthermore, there are at least three reinforcing air bags evenly distributed around the circumference of the bored pile body on the same cross section.

[0008] Furthermore, the reinforced airbag is filled with a reinforcing medium.

[0009] Furthermore, the reinforcement medium is foam lightweight soil or bubble lightweight soil.

[0010] This solution also discloses a construction method based on the cast-in-place pile, which is characterized by: further comprising construction equipment, the construction equipment including a power device and a grouting device;

[0011] The power device includes a power source I, a lifting rod, a pile drill bit and an extrusion block; the pile drill bit is mounted on the bottom end of the lifting rod, the extrusion block is driven to expand outward or contract inward, and the extrusion block is also driven to rotate. The lifting rod is driven to drive the pile drill bit up and down, and a camera is provided on the lifting rod near the extrusion block.

[0012] The grouting device includes a power source II, a slurry storage tank and a slurry delivery pipe. The front end of the slurry delivery pipe can be controlled to open and close and connect to the slurry storage tank. The rear end of the slurry delivery pipe has a slurry spraying port that can be controlled to adjust the use posture.

[0013] The following construction steps are also included:

[0014] S1: a grouting groove is formed for pouring the cast-in-place pile body, and a positioning groove is formed at a preset position of the grouting groove for positioning the reinforcing airbag;

[0015] S2: Fix the pre-installed reinforced airbag to the bottom of the extrusion block, start the power device, and transport the reinforced airbag to the positioning slot corresponding to the preset position through camera monitoring;

[0016] S3: driving the extrusion block to move so that the reinforced airbag is squeezed into the positioning groove corresponding to the preset position; separating the extrusion block and the reinforced airbag,

[0017] S4: starting the grouting device to transport the grouting port of the grouting pipe to the vicinity of the reinforcing airbag, and adjusting the posture of the grouting port so that the grouting port and the Achilles tendon of the reinforcing airbag are connected;

[0018] S5: Open one end of the slurry delivery pipe and the slurry storage tank to allow the reinforcement medium to fill the reinforcement air bag;

[0019] S6: Take out the power device and the grouting device in the grouting tank;

[0020] S7: Repeat steps S2-S6 until the preset number of reinforced airbags are embedded;

[0021] S8: burying the prefabricated steel cage into the grouting groove, and grouting the grouting groove to form a cast-in-place pile body;

[0022] S9: Repeat steps S1-S8 until the construction of a preset number of cast-in-place pile bodies is completed.

[0023] Furthermore, the bottom of the extrusion block in the height direction is conical.

[0024] Furthermore, the Achilles tendon of the reinforced airbag is fixed on the extrusion block, and the extrusion block is separated from the Achilles tendon in a driven rotation manner.

[0025] The beneficial effects of the present invention are as follows: the present invention discloses a bored pile and construction method, comprising a bored pile body and a reinforcing airbag. The bored pile body is cast vertically on the foundation. The reinforcing airbag surrounds the bored pile body and is connected to the bored pile body through a tendon. By arranging a plurality of reinforcing airbags circumferentially around the bored pile body, the structural strength of the bored pile body is enhanced. When the pile foundation is vertically loaded, the load is transferred to the reinforcing airbags and then distributed to the soil surrounding the pile. The method has high bearing capacity and solves the current problems of low bored pile drilling efficiency, slow construction speed, large material consumption, and limited scope of application. It is of great significance for my country's infrastructure construction, composite foundation reinforcement, and pile foundation engineering. The bored pile drilling technology is optimized and a transverse support structure is adopted, which greatly improves the bearing capacity of the bored pile and is suitable for foundation reinforcement in areas with deep soft soil. The entire bored pile drilling equipment has a simple structure, clear functions of each component, and strong adaptability, making it suitable for bored piles of different depths and sizes. The horizontal support structure plays a primary role in bearing the load, effectively saving vertical pile materials and meeting the goal of low-carbon, green economic development. Furthermore, the entire equipment system boasts high construction efficiency and relatively low noise pollution, which is of great significance for promoting infrastructure construction in my country's soft soil areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the cast-in-place pile body and the reinforced air bag forming an integral whole;

[0029] Figure 3 For the present invention Figure 2 AA structural diagram;

[0030] Figure 4 This is a schematic diagram of the structure of the extrusion block assembled on the lifting rod of the present invention;

[0031] FIG5 is a diagram of the present invention Figure 4 Schematic diagram of the longitudinal section structure. DETAILED DESCRIPTION

[0032] Figure 1The present invention is a schematic structural diagram. As shown in the figure, the bored pile in this embodiment includes a bored pile body 1 and a reinforcing airbag 2. The bored pile body 1 is cast on the foundation 3 in the vertical direction. The reinforcing airbag 2 surrounds the circumference of the bored pile body 1 and is connected to the bored pile body 1 through the Achilles tendon 4. Furthermore, the cross section of the bored pile body 1 is circular, that is, the bored pile body 1 is a cylindrical structure. The reinforcing airbag 2 is spherical, and the Achilles tendon 4 is cylindrical to connect the bored pile body 1 and the reinforcing airbag 2. The Achilles tendon 4 is made of high-strength steel, has high rigidity, is not easy to deform, and has a hollow center so that slurry can be injected into the reinforcing airbag. In the bag 2, the reinforcing air bag 2 is made of high-strength flexible material, with a rough surface and not easy to be damaged. During pressurized grouting, the reinforcing air bag 2 expands appropriately to form an enlarged head. As shown in the figure, this solution improves the structural strength of the bored pile body 1 by arranging several reinforcing air bags 2 circumferentially around the bored pile body 1. After the pile foundation is vertically loaded, the load is transferred to the reinforcing air bag 2 and then distributed to the soil around the pile. It has the characteristics of high bearing capacity and solves the current problems of low bored pile hole efficiency, slow construction speed, large amount of consumables, and limited scope of use. It is of great significance to my country's infrastructure construction, composite foundation 3 reinforcement, and pile foundation engineering.

[0033] In this embodiment, the reinforcing airbags 2 are arranged in a plurality around the circumference of the pile body 1. This arrangement can be spiral, array, or arranged along a predetermined line. In this embodiment, at least three reinforcing airbags 2 are evenly distributed around the circumference of the pile body 1 on the same cross-section. More specifically, four reinforcing airbags 2 are evenly distributed around the circumference of the pile body 1 on the same cross-section, with each group of four reinforcing airbags 2 forming a group. Multiple groups of reinforcing airbags 2 are arranged along the extension direction of the pile body 1, further strengthening the structural strength and increasing the bearing capacity of the pile body 1.

[0034] In this embodiment, the reinforcing airbag 2 is filled with a reinforcing medium, which is foamed lightweight soil or air-bubble lightweight soil. The slurry injected into the reinforcing airbag 2 is foamed lightweight soil or air-bubble lightweight soil, which has a density approximately half that of soft soil, resulting in a relatively low overall weight. After grouting, the reinforcing airbag 2 is suspended in the soft soil layer. When the pile foundation is vertically loaded, the load is transferred to the reinforcing airbag 2 and then distributed to the soil surrounding the pile, resulting in a high bearing capacity.

[0035] This solution also discloses a construction method based on the cast-in-place pile, which is characterized by: further comprising construction equipment, the construction equipment including a power device and a grouting device;

[0036] The power device includes a power source I9, a lifting rod 5, a pile drill bit 6 and an extrusion block 7; the pile drill bit 6 is installed at the end of the bottom of the lifting rod 5, the extrusion block 7 is driven to expand outward or contract inward, and the extrusion block 7 is also driven to rotate, and the lifting rod 5 is driven to drive the pile drill bit 6 to move up and down, and a camera 8 is provided at a position of the lifting rod 5 near the extrusion block 7; the power device is implemented by relying on existing equipment, such as the power source I9 is ​​selected as any of the commonly used engines, and any hydraulic lifting system 10 of the prior art is provided to realize the lifting function of the lifting rod 5, and the pile drill bit 6 is selected from any of the prior art and assembled at the end of the lifting rod 5, and the pile drill bit 6 can be driven to rotate. The implementation method also belongs to the prior art and is a mature product configuration in the current industry. The installation and use of the camera 8 on the lifting rod 5, including the adjustment of the use posture of the camera 8, is used to monitor whether the reinforcing airbag 2 has reached the preset position and whether the grouting port 15 of the slurry pipe 14 is connected to the Achilles tendon 4 of the reinforcing airbag 2. It is also a prior art and will not be repeated here.

[0037] It is particularly important to note the use of the extrusion block 7 in this solution. As shown in the figure, the extrusion block 7 is located at the top of the pile drill bit 6, and the camera 8 is located at the top of the extrusion block 7. The extrusion block 7 is a split conical structure mounted on the lifting rod 5 in the figure. The conical structure is divided into four blocks equal to the number of a group of reinforcing airbags 2, that is, the extrusion block 7 is evenly divided into four sub-extrusion blocks 71 corresponding to a group of reinforcing airbags 2. Each sub-extrusion block 71 is pushed outward or retracted inward by a push cylinder 11. The cylinder body of the push cylinder 11 is connected to the lifting rod 5 through a collar 12. The push rod of the push cylinder 11 is connected to the corresponding sub-extrusion block 71. The collar 12 is driven to rotate so that the sub-extrusion block 71 is driven to rotate by the push cylinder 11. The power of the push cylinder 11 and the power to drive the collar 12 to rotate are provided by the power source I9 or driven by the power source III separately. The driving mode can be direct drive rotation or gear pair drive rotation. The driving purpose can be achieved by relying on the existing technology and will not be repeated here.

[0038] The grouting device includes a power source II, a slurry storage tank 13 and a slurry delivery pipe 14. The front end of the slurry delivery pipe 14 can be controlled to open and close and is connected to the slurry storage tank 13. The rear end of the slurry delivery pipe 14 has a grouting port 15 that can be controlled to adjust the use posture. The grouting device is implemented by relying on existing equipment. For example, the power source II is selected as any of the commonly used engines. The opening and closing of the communication between the slurry storage tank 13 and the slurry delivery pipe 14 is controlled by any valve 16 in the prior art. The grouting port 15 of the slurry delivery pipe 14 is installed with a direct push pair and a rotary pair to adjust the posture by utilizing the prior art so that the grouting port 15 of the slurry delivery pipe 14 can be connected to the Achilles tendon 4 of the reinforcing airbag 2. The way of adjusting the posture of the grouting port 15 belongs to the prior art, such as the control of the interface of the water pipe and the interface control of the oil pipeline in the prior art, which will not be repeated here.

[0039] The following construction steps are also included:

[0040] S1: A grouting groove 17 is formed for pouring the bored pile body 1, and a positioning groove for positioning the reinforcing airbag 2 is formed at a preset position of the grouting groove 17;

[0041] S2: Fix the pre-installed reinforced airbag 2 to the bottom of the extrusion block 7, start the power device, and transport the reinforced airbag 2 to the positioning groove corresponding to the preset position through monitoring by the camera 8;

[0042] S3: Drive the extrusion block 7 to move so that the reinforced airbag 2 is squeezed into the positioning groove corresponding to the preset position; the reinforced airbag 2 is squeezed into the soft soil layer on both sides, and a certain length is reserved in the pile hole to form an anchoring end; separate the extrusion block 7 and the reinforced airbag 2, and the separation method is to rotate the extrusion block 7, and the bottom of the extrusion block 7 in the height direction is conical; the Achilles tendon 4 of the reinforced airbag 2 is fixed on the extrusion block 7, and the extrusion block 7 is separated from the Achilles tendon 4 in a driven rotation manner; further, before starting the power device, the reinforced airbag 2 with the Achilles tendon 4 is first connected to the extrusion block 7 in a weakly fixed manner. The weakly fixed connection method can be a connection method that is easy to be destroyed, such as gluing. When the reinforced airbag 2 is transported to the positioning groove corresponding to the preset position, the push cylinder 11 is started to strengthen the airbag 2 The extrusion block 7 is squeezed into the positioning groove corresponding to the preset position, and then the extrusion block 7 is driven to rotate. At this time, the rotation mode is instantaneous torque, which causes the connection between the Achilles tendon 4 and the extrusion block 7 to break, and the reinforcing airbag 2 is separated from the extrusion block 7 and confined in the positioning groove. This rotation mode also drives the extrusion block 7 to move downward. Since the overall structure of the extrusion block 7 is conical, the bottom of the cone is connected to the Achilles tendon 4. When the extrusion block 7 rotates and moves downward, the connection between the Achilles tendon 4 and the extrusion block 7 is not only subjected to radial torque but also to vertical downward pressure and horizontal outward thrust, further improving the effectiveness of the separation of the Achilles tendon 4 and the extrusion block 7. In this step, the camera 8 also assists in observing whether the pushing cylinder 11 fully squeezes the reinforcing airbag 2 into the positioning groove corresponding to the preset position as required, and whether the reinforcing airbag 2 is separated from the extrusion block 7.

[0043] S4: Start the grouting device to transport the grouting port 15 of the grouting pipe 14 to the vicinity of the reinforcing airbag 2, and adjust the posture of the grouting port 15 so that the grouting port 15 and the Achilles tendon 4 of the reinforcing airbag 2 are connected; in this step, the camera 8 also assists in observing whether the grouting port 15 and the Achilles tendon 4 are connected;

[0044] S5: Open one end of the slurry delivery pipe 14 and the slurry storage tank 13 to allow the reinforcement medium to fill the reinforcing airbag 2; the filling amount is based on the design and is arranged according to site requirements, which will not be repeated here;

[0045] S6: Take out the power device and the grouting device in the grouting tank 17;

[0046] S7: Repeat steps S2-S6 until the preset number of reinforced airbags 2 are embedded;

[0047] S8: burying the prefabricated steel cage into the grouting groove 17, grouting the grouting groove 17 to form the cast-in-place pile body 1; pouring the pre-prepared concrete into the pile hole, vibrating and compacting it, and pouring the single cast-in-place pile body 1;

[0048] S9: Repeat steps S1-S8 until the construction of a preset number of cast-in-place pile bodies 1 is completed.

[0049] In this embodiment, the various parts of the equipment can be flexibly disassembled and installed. The power device of this solution also includes a micro-high-frequency vibrator 18 installed on the top of the pile drill bit 6, which can accelerate the penetration of the entire equipment to improve construction efficiency.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for constructing a cast-in-place pile, characterized in that: The pile body comprises a bored pile body and a reinforcing air bag, wherein the bored pile body is cast on the foundation in a vertical direction, and the reinforcing air bag surrounds the bored pile body and is connected to the bored pile body through an Achilles tendon; Also included is construction equipment, which includes a power unit and a grouting device; The power device includes a power source I, a lifting rod, a pile drill bit and an extrusion block; the pile drill bit is mounted at the bottom end of the lifting rod, the extrusion block is driven to expand outward or contract inward, and the extrusion block is also driven to rotate, and the lifting rod is driven to drive the pile drill bit up and down, the extrusion block is located at the top of the pile drill bit and is mounted on the lifting rod, and a camera is provided on the lifting rod near the extrusion block; The grouting device includes a power source II, a slurry storage tank and a slurry delivery pipe. The front end of the slurry delivery pipe can be controlled to open and close and connect to the slurry storage tank. The rear end of the slurry delivery pipe has a slurry spraying port that can be controlled to adjust the use posture. The following construction steps are also included: S1: a grouting groove is formed for pouring the cast-in-place pile body, and a positioning groove is formed at a preset position of the grouting groove for positioning the reinforcing airbag; S2: Fix the pre-installed reinforced airbag to the bottom of the extrusion block, start the power device, and transport the reinforced airbag to the positioning slot corresponding to the preset position through camera monitoring; S3: driving the extrusion block to move so that the reinforced airbag is squeezed into the positioning groove corresponding to the preset position; separating the extrusion block and the reinforced airbag, S4: starting the grouting device to transport the grouting port of the grouting pipe to the vicinity of the reinforcing airbag, and adjusting the posture of the grouting port so that the grouting port and the Achilles tendon of the reinforcing airbag are connected; S5: Open one end of the slurry delivery pipe and the slurry storage tank to allow the reinforcement medium to fill the reinforcement air bag; S6: Take out the power device and the grouting device in the grouting tank; S7: Repeat steps S2-S6 until the preset number of reinforced airbags are embedded; S8: burying the prefabricated steel cage into the grouting groove, and grouting the grouting groove to form a cast-in-place pile body; S9: Repeat steps S1-S8 until the construction of a preset number of cast-in-place pile bodies is completed.

2. The method for constructing a cast-in-place pile according to claim 1, characterized in that: The reinforcement air bags are multiple and surround the circumference of the cast-in-place pile body.

3. The construction method of cast-in-place pile according to claim 2, characterized in that: There are at least three reinforcing air bags evenly distributed around the circumference of the cast-in-place pile body on the same cross section.

4. The method for constructing a cast-in-place pile according to claim 3, characterized in that: The reinforcing airbag is filled with a reinforcing medium.

5. The method for constructing a cast-in-place pile according to claim 4, characterized in that: The reinforcement medium is foam lightweight soil or bubble lightweight soil.

6. The method for constructing a cast-in-place pile according to claim 1, characterized in that: The bottom of the extrusion block in the height direction is tapered.

7. The method for constructing a cast-in-place pile according to claim 6, characterized in that: The Achilles tendon of the reinforced airbag is fixed on the extrusion block, and the extrusion block is separated from the Achilles tendon in a driven rotation manner.

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