Engineering pile construction method

Abstract

The invention discloses an engineering pile construction method. The engineering pile construction method comprises the following steps: S1, paying off and fixing a pile position; s2, a drilling machine is in place; s3, rotary excavating and soil taking; s4, a pile casing is vertically arranged, the pile casing is vertically inserted into the formed hole, vertical pressure is applied to the pile casing, the lower end of the pile casing is located at the bottom of the hole, and the upper end of the pile casing is 30 cm higher than the ground; s5, hole forming is carried out, rotary digging is carried out on the lower portion of the pile casing, the other section of the pile casing is connected and fixed after rotary digging is carried out downwards by two meters every time, the pile casing at the upper end is positioned through a positioning device, the pile casing is pressed into the formed hole in the vertical direction, and the inner wall of the formed hole is completely supported; s6, hole cleaning; s7, a reinforcement cage is hoisted and placed; s8, concrete is poured; and S9, pile forming. According to the construction method, the construction mode that a section of pile casing is installed every time a hole is drilled by a certain depth is adopted, the mutually-connected pile casings are made to completely support the inner wall of a formed hole, hole wall collapse is prevented, later construction cannot be affected, and therefore stable construction and efficient construction of an engineering pile are guaranteed.

Description

Technical Field

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

[0002] Cast-in-place engineering piles are a type of pile foundation formed by on-site pouring, and are widely used in various construction projects. After drilling or excavating holes in the foundation, steel reinforcement cages are placed into the holes, and then concrete is poured to form pile bodies to ensure the stability and safety of buildings.

[0003] In the construction process of traditional cast-in-place engineering piles, a rotary drill is usually used for drilling, then the bottom of the hole is cleaned, and then a crane is used to hoist the steel reinforcement cage into the hole. Finally, the underwater concrete pouring is carried out by the conduit method.

[0004] However, when drilling in locations with poor geological conditions, it is very easy to occur the phenomenon of hole collapse. Therefore, slurry is often injected during the drilling process to maintain the stability of the hole wall. However, when encountering the gravel layer, the adhesion of the slurry is limited, and the gravel is very easy to fall to the bottom of the hole, causing inconvenience to the subsequent construction and affecting the construction efficiency, which needs to be improved. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a construction method for engineering piles, which has the effect of improving construction efficiency.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions: A construction method for engineering piles, including the following steps: S1, laying out the pile positions; S2, positioning the drill rig; S3, rotary excavation for soil extraction; S4, setting up the casing and vertically pressing the casing into the formed hole; S5, forming the hole, carrying out rotary excavation below the casing, then connecting and fixing another section of the casing, and using a positioning device to position the upper end of the casing, and continuously pressing sections of the casing into the formed hole; S6, cleaning the hole, using the slurry replacement method or the slag extraction method to remove the sediment and slurry at the bottom of the hole; S7, hoisting and placing the steel reinforcement cage, hoisting the fabricated steel reinforcement cage into the hole; S8, pouring concrete, inserting the conduit into the formed hole, then slowly lifting all the casings upwards, and slowly pouring the concrete into the formed hole through the conduit during the lifting process; S9, forming the pile, and completing the construction of the cast-in-place pile after solidification.

[0007] In a preferred example, the present invention can be further configured as follows: in step S4, the casing is vertically inserted into the drilled hole, and a vertical pressure is applied to the casing so that the lower end of the casing is located at the bottom of the hole and the upper end is 30 cm above the ground, thereby realizing the support and protection of the inner wall of the drilled hole.

[0008] In a preferred example, the present invention can be further configured as follows: in step S7, the fabricated steel reinforcement cage is lifted and placed into the hole to ensure the accurate position of the steel reinforcement cage. During the installation process of the steel reinforcement cage, deformation of the steel reinforcement cage and collision with the hole wall should be prevented. The top end of the steel reinforcement cage should be fixed at the hole opening to prevent the steel reinforcement cage from floating up.

[0009] In a preferred example, the present invention can be further configured as follows: a plurality of arc-shaped dovetail blocks are provided at the lower end of the casing, and a groove and a dovetail groove that communicate with each other are provided at the upper end of the casing. The groove is for the vertical insertion of the dovetail block, and the dovetail groove is for the dovetail block to be inserted after rotation.

[0010] In a preferred example, the present invention can be further configured as follows: a locking hole is vertically penetrated through the casing, a locking rod is vertically slidably connected in the locking hole, and a spring for controlling the upward movement of the locking rod is provided in the locking hole.

[0011] In a preferred example, the present invention can be further configured as follows: the positioning device includes a positioning disk, a rotating shaft, a support rod, a positioning plate, a locking member, and a driving mechanism. The positioning disk is annularly arranged on the ground. The rotating shaft is horizontally rotatably connected to the upper end surface of the positioning disk and is distributed around the positioning disk. The support rod is fixed to the rotating shaft. The cross section of the positioning plate is arc-shaped and is rotatably connected to the support rod. The locking member is used to fix the positioning plate so that the positioning plate vertically clamps the outer wall of the casing. The driving mechanism is used to control the synchronous rotation of a plurality of the rotating shafts.

[0012] In a preferred example, the present invention can be further configured as follows: the locking member includes a pair of locking rods and a locking tube. The pair of locking rods are respectively rotatably connected to the upper outer wall of the positioning plate and the middle position of the support rod. The locking tube is located between the pair of locking rods and is threadedly connected to the pair of locking rods.

[0013] In a preferred example, the present invention can be further configured as follows: the driving mechanism includes a rack, a gear, a driving disk, a worm gear, and a worm. The rack is slidably connected to the positioning disk along the diameter direction of the positioning disk. The gear is arranged on the outer wall of the rotating shaft and meshes with the rack. The driving disk is rotatably connected to the inside of the positioning disk. A guide rod is vertically provided on the lower end surface of the rack, and an arc-shaped guide hole for the guide rod to slide is provided on the positioning disk. The worm gear is arranged on the outer wall of the driving disk. The worm is rotatably connected to the positioning disk and meshes with the worm gear.

[0014] In a preferred example, the present invention can be further configured such that a number of balls are evenly distributed on the inner wall of the positioning plate.

[0015] In a preferred example, the present invention can be further configured such that a hanging basket is rotatably connected to the lower end of the positioning plate, a laser pen is vertically arranged in the hanging basket, and a through hole for the light of the laser pen to pass through is vertically arranged on the positioning plate.

[0016] In summary, the present invention has the following beneficial effects: 1. By adopting the construction method of installing a section of casing every certain depth of drilling, the mutually connected casings support the inner wall of the formed hole entirely, preventing the collapse of the hole wall and having no impact on the subsequent construction, thus ensuring the stable and efficient construction of the engineering pile. 2. By setting the self-locking type of casing, rapid connection and stable fixation between the casings can be achieved, ensuring the continuous pressing-in and synchronous pulling-out of each section of the casing. 3. By providing a positioning device on the ground, the vertical positioning of each section of the casing is realized, ensuring that the casing is pressed into the formed hole along the vertical direction and guaranteeing the hole-forming accuracy. Description of the Drawings

[0017] Figure 1 is the structural schematic diagram of the casing in the embodiment; Figure 2 is the schematic diagram of the connection relationship of the casings in the embodiment; Figure 3 is the schematic diagram of the usage state of the positioning device in the embodiment; Figure 4 is the structural schematic diagram of the positioning device in the embodiment; Figure 5 is the schematic diagram of the connection relationship of the positioning device in the embodiment; Figure 6 is the structural schematic diagram of the support rod in the embodiment.

[0018] Reference numerals: 1, casing; 11, dovetail block; 12, groove; 13, dovetail groove; 14, locking hole; 15, locking rod; 16, spring; 2, positioning device; 21, positioning disk; 22, rotating shaft; 23, support rod; 24, positioning plate; 25, ball; 26, hanging basket; 27, laser pen; 28, through hole; 3, locking member; 31, locking rod; 32, locking tube; 4, driving mechanism; 41, rack; 42, gear; 43, driving disk; 44, worm gear; 45, worm; 46, guide rod; 47, guide hole. Detailed Embodiment

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] A construction method for engineering piles, comprising the following steps: S1. Laying out and positioning the piles. First, calculate the coordinates of each pile position according to the construction drawings and the factory coordinate system. The pile positions can be measured and laid out in batches according to the construction progress. Use Φ16 steel bars to mark the pile positions, with the penetration depth into the soil not less than 30 cm, and then sprinkle lime around the piles.

[0021] S2. Positioning the drilling rig. Accurately install the drilling rig on the pile position, and adjust the verticality and levelness of the drilling rig to ensure that the verticality deviation of the drilled hole does not exceed the specified requirements.

[0022] S3. Rotary excavation for soil extraction. According to the geological conditions and design requirements, select appropriate drilling speeds, rotation speeds, and drilling pressures, and carry out drilling operations. During the drilling process, regularly check the verticality and diameter of the drilled hole, and adjust in time if there are any deviations.

[0023] S4. Installing the casing 1. Vertically insert the casing 1 into the formed hole, and apply a vertical pressure to the casing 1 so that the lower end of the casing 1 is located at the bottom of the hole, and the upper end is 30 cm above the ground to achieve the support and protection of the inner wall of the formed hole.

[0024] S5. Forming the hole. Carry out rotary excavation below the casing 1 and remove the soil and stones. After every two meters of downward rotary excavation, connect and fix another section of the casing 1, and use the positioning device 2 to position the upper casing 1 so that the casing 1 is pressed into the formed hole along the vertical direction, and the interconnected sections of the casing 1 support the entire inner wall of the formed hole.

[0025] S6. Clearing the hole. After the drilling reaches the design depth, use the slurry replacement method or the slag extraction method to remove the sediment and slurry at the bottom of the hole.

[0026] S7. Lifting and placing the steel reinforcement cage. Lift the fabricated steel reinforcement cage into the hole, ensure the accurate position of the steel reinforcement cage, and prevent the steel reinforcement cage from deforming and colliding with the hole wall during the installation process. The top of the steel reinforcement cage should be fixed at the hole opening to prevent the steel reinforcement cage from floating up.

[0027] S8. Pouring concrete. Insert the conduit into the formed hole, with the bottom of the conduit 30 cm away from the bottom of the hole, and then slowly lift all the casings 1 upward, and pour the concrete into the formed hole slowly through the conduit during the lifting process, and lift the conduit while pouring to ensure the continuity and compactness of the concrete pouring.

[0028] S9. Forming the pile. After the concrete is poured to the design elevation, promptly clean the floating slurry and excess concrete at the pile head, and complete the construction of the cast-in-place pile after it solidifies.

[0029] Therefore, by adopting the construction method of installing a section of casing 1 at a certain depth each time during drilling, the interconnected sections of casing 1 support the entire inner wall of the drilled hole, preventing the collapse of the hole wall and having no impact on the subsequent construction, thus ensuring the stable and efficient construction of the engineering pile.

[0030] As Figure 1 , Figure 2 shown, a plurality of arc-shaped dovetail blocks 11 are provided at the lower end of the casing 1, and a groove 12 and a dovetail groove 13 that communicate with each other are provided at the upper end of the casing 1. The groove 12 is for the vertical insertion of the dovetail block 11, and the dovetail groove 13 is for the dovetail block 11 to be inserted after rotation.

[0031] As Figure 1 , Figure 2 shown, a locking hole 14 is vertically penetrated through the casing 1. A locking rod 15 is vertically slidably connected in the locking hole 14, and a spring 16 for controlling the upward movement of the locking rod 15 is provided in the locking hole 14.

[0032] When it is necessary to connect and press each section of the casing 1, the casing 1 is lifted, so that the dovetail block 11 at the lower end of the casing 1 is inserted into the groove 12 at the upper end of the casing 1 on the ground to realize the positioning between adjacent casings 1. Subsequently, the upper casing 1 is controlled to rotate, so that the dovetail block 11 is inserted into the dovetail groove 13 to realize the preliminary locking and fixing between adjacent casings 1.

[0033] And during the hoisting and installation process of the casing 1, as the upper section of the casing 1 is installed, the upper section of the casing 1 will press the locking rod 15 on the lower section of the casing 1 to slide downward, so that the upper end of the locking rod 15 is inserted into the locking hole 14, and the lower end passes through the upper section of the casing 1 and then inserts into the locking hole 14 on the lower section of the casing 1, completing the locking in the vertical direction and circumferential direction between adjacent two sections of the casing 1, ensuring the continuous pressing and synchronous pulling of each section of the casing 1.

[0034] As Figure 3 , Figure 4 , Figure 5 shown, the positioning device 2 includes a positioning disk 21, a rotating shaft 22, a support rod 23, a positioning plate 24, a locking member 3 and a driving mechanism 4.

[0035] As Figure 3 , Figure 4 , Figure 5 shown, the positioning disk 21 is annularly arranged on the ground. The rotating shaft 22 is horizontally rotatably connected to the upper end surface of the positioning disk 21 and is distributed around the positioning disk 21. The support rod 23 is fixed to the rotating shaft 22. The cross section of the positioning plate 24 is arc-shaped and is rotatably connected to the support rod 23. A plurality of balls 25 are evenly distributed on the inner wall of the positioning plate 24.

[0036] As Figure 4 , Figure 5 ,Figure 6 As shown, the locking member 3 is used to fix the positioning plate 24, so that the positioning plate 24 vertically clamps the outer wall of the casing 1.

[0037] As Figure 6 shown, the locking member 3 includes a pair of locking rods 31 and a locking tube 32. The pair of locking rods 31 are respectively rotatably connected to the upper outer wall of the positioning plate 24 and the middle position of the support rod 23. The locking tube 32 is located between the pair of locking rods 31 and is threadedly connected to the pair of locking rods 31.

[0038] As Figure 3 、 Figure 4 、 Figure 5 shown, the driving mechanism 4 is used to control the synchronous rotation of a plurality of rotating shafts 22. The driving mechanism 4 includes a rack 41, a gear 42, a driving disk 43, a worm gear 44 and a worm 45.

[0039] As Figure 3 、 Figure 4 、 Figure 5 shown, the rack 41 is slidably connected to the positioning disk 21 along the diameter direction of the positioning disk 21. The gear 42 is arranged on the outer wall of the rotating shaft 22 and meshes with the rack 41. The driving disk 43 is rotatably connected to the inside of the positioning disk 21. A guide rod 46 is vertically arranged on the lower end surface of the rack 41, and an arc-shaped guide hole 47 for the guide rod 46 to slide is arranged on the positioning disk 21. The worm gear 44 is arranged on the outer wall of the driving disk 43, and the worm 45 is rotatably connected to the positioning disk 21 and meshes with the worm gear 44.

[0040] When each section of the casing 1 is pressed in, first place the positioning disk 21 on the ground so that the positioning disk 21 is coaxially arranged with the casing 1 and fix the positioning disk 21 on the ground. Then use the motor to control the rotation of the worm 45. The worm 45 drives the worm gear 44 and the driving disk 43 to rotate. At this time, under the combined action of the guide rod 46 and the guide hole 47, the rack 41 will be controlled to slide horizontally. The rack 41 drives the gear 42 and the rotating shaft 22 to rotate and controls the support rod 23 to flip.

[0041] Subsequently, control the rotation of the locking tube 32 to make the pair of locking rods 31 slide relative to each other and control the rotation of the positioning plate 24 until the positioning plate 24 rotates to a vertical state. After that, the positioning plate 24 can fit the outer wall of the casing 1, realizing the clamping and supporting positioning of the casing 1, ensuring that the casing 1 is pressed into the hole along the vertical direction and ensuring the hole forming accuracy.

[0042] As Figure 6 shown, a hanging basket 26 is rotatably connected to the lower end of the positioning plate 24. A laser pen 27 is vertically arranged in the hanging basket 26, and a through hole 28 for the light of the laser pen 27 to pass through is vertically arranged on the positioning plate 24.

[0043] When adjusting the perpendicularity of the positioning plate 24, the suspended basket 26 connected by rotation can shake and act as a plumb bob. After the shaking of the suspended basket 26 stops, the laser pen 27 on the suspended basket 26 emits light upward. If the light can be emitted along the through hole 28, it indicates that the positioning plate 24 is in a vertical state. Otherwise, the angle of the positioning plate 24 needs to be adjusted to ensure that the positioning plate 24 is absolutely vertical to meet the vertical pressing of the casing 1.

[0044] The specific embodiments are only explanations of the present invention and are not limitations thereof. Those skilled in the art can make modifications to the embodiments without creative contributions according to needs after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A construction method for engineering piles, characterized in that: It includes the following steps: S1. Set out the pile positions by paying out the wire. S2. Position the drilling rig. S3. Rotating drilling to extract soil. S4. Set up the casing (1), and vertically press the casing (1) into the formed hole. S5. Form the hole. Carry out rotating drilling below the casing (1), then connect and fix another section of the casing (1), and use the positioning device (2) to position the upper end of the casing (1), and continuously press sections of the casing (1) into the formed hole. S6. Clean the hole. Use the slurry replacement method or the slag pumping method to remove the sediment and slurry at the bottom of the hole. S7. Lift and place the steel reinforcement cage. Lift the fabricated steel reinforcement cage into the hole. S8. Pour concrete. Insert the conduit into the formed hole, then slowly lift all the casings (1) upwards, and slowly pour the concrete into the formed hole through the conduit during the lifting process. S9. Form the pile. After solidification, complete the construction of the cast-in-place pile.

2. The construction method of an engineering pile according to claim 1, characterized in that: In step S4, vertically insert the casing (1) into the formed hole, and apply a vertical pressure to the casing (1) so that the lower end of the casing (1) is located at the bottom of the hole, and the upper end is 30 cm above the ground, to achieve the support and protection of the inner wall of the formed hole.

3. A construction method of engineering piles according to claim 1, characterized in that: In step S7, lift the fabricated steel reinforcement cage into the hole, ensure the accurate position of the steel reinforcement cage. During the installation process of the steel reinforcement cage, prevent the steel reinforcement cage from deforming and colliding with the hole wall. The top end of the steel reinforcement cage should be fixed at the hole opening to prevent the steel reinforcement cage from floating up.

4. A construction method of engineering piles according to claim 1, characterized in that: A plurality of arc-shaped dovetail blocks (11) are arranged at the lower end of the casing (1), and a groove (12) and a dovetail groove (13) which are communicated with each other are arranged at the upper end of the casing (1). The dovetail blocks (11) are vertically inserted into the groove (12), and the dovetail blocks (11) are rotated and inserted into the dovetail groove (13).

5. The construction method of an engineering pile according to claim 4, characterized in that: A locking hole (14) is vertically penetrated through the casing (1), a locking rod (15) is vertically slidably connected in the locking hole (14), and a spring (16) for controlling the upward movement of the locking rod (15) is arranged in the locking hole (14).

6. A construction method of engineering piles according to claim 1, characterized in that: [[ID= 7. A construction method of engineering piles according to claim 6, characterized in that: ​ 8. A construction method of engineering piles according to claim 6, characterized in that: The driving mechanism (4) includes a rack (41), a gear (42), a driving disk (43), a worm gear (44) and a worm (45). The rack (41) is slidably connected to the positioning disk (21) along the diameter direction of the positioning disk (21). The gear (42) is arranged on the outer wall of the rotating shaft (22) and meshes with the rack (41). The driving disk (43) is rotatably connected to the inside of the positioning disk (21). A guide rod (46) is vertically arranged on the lower end surface of the rack (41). An arc-shaped guide hole (47) for the guide rod (46) to slide is arranged on the positioning disk (21). The worm gear (44) is arranged on the outer wall of the driving disk (43). The worm (45) is rotatably connected to the positioning disk (21) and meshes with the worm gear (44).

9. A construction method for engineering piles according to claim 6, characterized in that: A plurality of balls (25) are evenly distributed on the inner wall of the positioning plate (24).

10. A construction method of engineering piles according to claim 9, characterized in that: A hanging basket (26) is rotatably connected to the lower end of the positioning plate (24). A laser pen (27) is vertically arranged in the hanging basket (26). A through hole (28) for the light of the laser pen (27) to pass through is vertically arranged on the positioning plate (24).

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