Rectangular-section anti-sliding pile rotary excavating mechanical hole-forming construction method

Abstract

The application discloses a rectangular-section anti-slide pile rotary digging mechanical hole-forming construction method and relates to the field of anti-slide pile construction. The application comprises the steps of site leveling, measurement and line laying, lock mouth construction, pile hole drilling and pile hole acceptance. The application forms holes in the order of first digging a side center hole and then digging a peripheral hole, compared with the traditional hole-forming order of first digging a peripheral hole and then digging a vertical center hole, the excavation section is more regular, and the remaining soil to be cleaned after drilling is greatly reduced; meanwhile, the formed section is regular and not easy to collapse, and a retaining wall does not need to be constructed.

Description

Technical Field

[0001] This invention patent relates to the field of anti-slide pile construction, and in particular to a mechanical drilling method for rectangular cross-section anti-slide piles. Background Technology

[0002] With the vigorous construction of expressways in my country, rectangular cross-section anti-slide piles are becoming increasingly widely used in unfavorable geological conditions.

[0003] In recent years, the application of rotary drilling to construct rectangular cross-section anti-slide piles has been gradually carried out, but the results have been unsatisfactory. For example... Figure 1 As shown, the existing construction methods for rectangular cross-section anti-slide pile holes all adopt the method of drilling peripheral holes from the outside and then drilling the center hole. This method has many steps and a long construction period. Moreover, because the cross-section is irregular during drilling, it is very easy to collapse, requiring additional wall protection, resulting in high construction costs. Summary of the Invention

[0004] The purpose of this invention is to provide a mechanical drilling method for rectangular cross-section anti-slide piles to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A mechanical drilling method for rectangular cross-section anti-slide piles includes the following steps: S1. Level the site; S2. Based on the anti-slide pile layout path, after site leveling is completed, locate and mark out each pile hole according to the construction drawings; S3. Casting with interlocking formwork; S4. Use a large-diameter drilling rig to drill two vertically symmetrical central holes; S5. Use a small-diameter drilling rig to drill peripheral holes around the two center holes; S6. Use the inside of the lock opening as a guide wall and use a rectangular sheared steel channel to repair the hole; S7. Use a core drill to remove the burrs from the bottom of the hole; S8. Acceptance of the completed pile hole.

[0006] The specific implementation of step S4 is as follows: using a core drill with a large-diameter round drill bit, first core drilling is performed to the designed depth to obtain the first off-center hole and the second off-center hole respectively; the hole wall of the first drilled center hole is tangent to the inner walls on both sides of the long side direction and one side of the short side direction of the lock opening respectively, and the hole wall of the second drilled center hole is tangent to the inner walls on both sides of the long side direction of the lock opening and the other side of the short side direction of the lock opening respectively.

[0007] The specific implementation of step S5 is as follows: after the central hole in step S4 is excavated, a small-diameter round drill bit is used to drill peripheral holes of the required design depth at the four corners of the lock opening by sequentially core drilling.

[0008] The specific implementation method of step S3 is as follows: the lock opening is supported by C20 cast-in-place reinforced concrete, the thickness of the lock opening is 50cm, the lock opening reinforcement is HPB300φ10, the outer dimension of the lock opening is 3m×3.5m, the inner dimension of the lock opening is 2m×2.5m, the height of the lock opening is 50cm, and it is 10cm higher than the original ground.

[0009] The large-diameter round drill bit has a diameter of 200cm, and the small-diameter round drill bit has a diameter of 80cm. The specific implementation of step S6 is as follows: after the peripheral hole excavation in step S5 is completed, the hole wall below the inner wall of the lock opening is trimmed using a rectangular shearing steel groove until the size of the anti-slip pile hole is consistent with the size of the inner wall of the lock opening.

[0010] The beneficial effects of this invention are: ① The present invention, by excavating the center hole first and then the peripheral holes, has a more regular excavation cross section compared with the traditional drilling sequence of excavating the peripheral holes first and then the center hole. This greatly reduces the amount of soil left to be cleaned after drilling. At the same time, the formed cross section is regular and not easy to collapse, so there is no need to construct a retaining wall.

[0011] ② Compared with the traditional drilling sequence of excavating the perimeter holes first and then the center hole, this method saves a lot of construction steps, shortens the construction period, and only requires two construction workers to organize the construction, which greatly saves manpower and time resources. Attached Figure Description

[0012] Figure 1 A schematic diagram of the mechanical rotary drilling sequence in traditional mechanical hole-forming construction. Figure 2 This is a schematic diagram of the process of the present invention; Figure 3 This is a schematic diagram of step S4 in the present invention; Figure 4 This is a schematic diagram of step S5 in the present invention; Figure 5 This is a table of measured items for bored piles.

[0013] In the diagram: 1. Locking opening; 2. First off-center hole; 3. Second off-center hole; 4. First peripheral hole; 5. Second peripheral hole; 6. Third peripheral hole; 7. Fourth peripheral hole; 8. Center hole; 9. Excess soil. Detailed Implementation

[0014] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0015] Please see Figures 2-5 This invention provides a mechanical drilling method for rectangular cross-section anti-slide piles.

[0016] like Figure 2 As shown, a mechanical drilling method for rectangular cross-section anti-slide piles includes the following steps: S1. Level the site. Before starting the anti-slide pile drilling work, personnel should be organized to level the soil at the construction site to facilitate subsequent construction steps.

[0017] S2. Based on the anti-slide pile layout path, after site leveling is completed, locate and mark out each pile hole according to the construction drawings; In this step, the center crosshairs of the pile foundation are measured to determine the accurate location of the pile hole. At the same time, four control piles are drawn from the center point of the pile position to the position outside the lock 1 using the longitudinal and transverse axis method, so as to hang lines to check the position of the control piles. After all the pile lines are laid out, they are checked again. After passing the check, the report is submitted to the supervisor for re-measurement. Only after confirming that the coordinates of each pile meet the requirements can construction begin.

[0018] S3. Casting of the vertical formwork at the lock joint 1; In this step, lock opening 1 is supported by C20 cast-in-place reinforced concrete. The thickness of lock opening 1 is 50cm. The steel bars of lock opening 1 are HPB300φ10. The outer dimensions of lock opening 1 are 3m×3.5m, the inner dimensions of lock opening 1 are 2m×2.5m, and the height of lock opening 1 is 50cm, which is 10cm higher than the original ground.

[0019] After multiple actual excavations and tests of the rectangular pile holes by the construction personnel, it was found that, for the corresponding interlock size of 2m×2.5m, a 200cm drill bit is used for large-diameter round drill bits and an 80cm drill bit is used for small-diameter drill bits. After the drilling steps of this construction method, the remaining volume of soil to be treated is the minimum.

[0020] S4. Use a large-diameter drilling rig to drill two vertically symmetrical central holes; like Figure 3 As shown, the specific implementation of step S4 is as follows: using a core drill with a large-diameter round drill bit, first core drilling is performed to the designed depth to obtain the first off-center hole 2 and the second off-center hole 3 respectively; the hole wall of the first off-center hole 2 is tangent to the inner walls on both sides of the long side direction and one side of the short side direction of the lock opening 1 respectively, and the hole wall of the second off-center hole 3 is tangent to the inner walls on both sides of the long side direction and the other side of the short side direction of the lock opening 1 respectively.

[0021] Traditional single-center-hole drilling methods are affected by the shape of the interlock 1. The inner walls of the two shorter sides of the interlock 1 are still a certain distance away from the central hole 8. In order to ensure that the construction efficiency is not affected when removing the remaining soil, it is necessary to continue drilling multiple times with a small-diameter drill at the two distances. However, the present invention adopts a double-center-hole drilling method. The first off-center hole 2 and the second off-center hole 3 are tangent to the inner walls of the two shorter sides of the interlock 1, respectively. The extra drilling step with a large-diameter drill saves the subsequent multiple drilling steps with small-diameter drills, greatly improving drilling efficiency.

[0022] S5. Use a small-diameter drilling rig to drill peripheral holes around the two center holes; like Figure 4 As shown, the specific implementation of step S5 is as follows: after the central hole in step S4 is excavated, a small-diameter round drill bit is used to drill the first peripheral hole 4, the second peripheral hole 5, the third peripheral hole 6 and the fourth peripheral hole 7, which are tangent to the lock opening 1 and have the required design depth, in sequence at the four corners of the lock opening 1.

[0023] As the drilling process deepens, the density and pressure of the soil gradually increase. Traditional drilling techniques, which involve drilling peripheral holes first and then the central hole, often result in the soil at the central hole loosening or even collapsing due to drilling vibrations, affecting the quality of the borehole. Furthermore, drilling the central hole requires cleaning the accumulated soil from the peripheral holes, leading to low construction efficiency. In contrast, this invention drills the peripheral holes after the central hole is completed. During the central hole drilling, the contact area between the soil at the peripheral hole location and the central hole is significantly smaller than in the traditional method. Therefore, the soil at the peripheral hole location is less prone to loosening or collapse during the central hole drilling, effectively ensuring construction efficiency.

[0024] S6. Using the inside of lock 1 as a guide wall, use a rectangular shear steel channel to repair the hole; After the peripheral hole excavation in step S5 is completed, first as follows: Figure 2 The steps shown in the right column complete the assembly of the rectangular shearing steel channel required for hole repair. Then, use the rectangular shearing steel channel to repair the hole wall below the inner wall of the lock 1, and remove the excess soil 9 in the anti-slide pile hole until the shape and size of the anti-slide pile hole are consistent with the shape and size of the inner wall of the lock 1.

[0025] When the lock size is the same and the number of construction steps is similar, such as Figure 4 The area of ​​the remaining soil 9 to be cut in the anti-slide pile hole after drilling, as shown in this construction method, is significantly smaller than that shown in the figure. Figure 1The area of ​​the remaining soil 9 to be cut in the pile hole after drilling in the traditional method is shown; therefore, the excess soil 9 left after drilling in this construction method is less than that in the traditional construction method, which can also greatly improve the work efficiency of the subsequent S6 process steps.

[0026] S7. Use a core drill to remove the burrs from the bottom of the hole.

[0027] S8. Acceptance of the completed pile hole; After the hole is drilled, the construction personnel must follow the instructions. Figure 5 The table showing the measured items for bored piles is used for the inspection and acceptance of anti-slide pile holes.

[0028] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A mechanical drilling method for rectangular cross-section anti-slide piles, characterized in that, Includes the following steps: S1. Level the site; S2. Based on the layout path of the anti-slide piles, after the site leveling is completed, locate and mark out each pile hole according to the construction drawings; S3. Casting with interlocking formwork; S4. Use a large-diameter drilling rig to drill two vertically axially symmetrical central holes; use a core drill with a large-diameter round drill bit to drill to the designed depth to obtain the first off-center hole and the second off-center hole respectively; the hole wall of the first drilled central hole is tangent to the inner walls on both sides of the long side of the lock and one side of the short side of the lock respectively; the hole wall of the second drilled central hole is tangent to the inner walls on both sides of the long side of the lock and the other side of the short side of the lock respectively. S5. Use a small-diameter drill to drill peripheral holes around the two center holes; after the center holes in step S4 are excavated, replace the small-diameter round drill bit with a core drill to drill peripheral holes of the required design depth at the four corners of the lock opening. S6. Use the inside of the lock opening as a guide wall and use a rectangular sheared steel channel to repair the hole; S7. Use a core drill to remove the burrs from the bottom of the hole; S8. Acceptance of the completed pile hole.

2. The construction method for rotary drilling of rectangular cross-section anti-slide piles according to claim 1, characterized in that: The specific implementation method of step S3 is as follows: the lock opening is supported by C20 cast-in-place reinforced concrete, the thickness of the lock opening is 50cm, the lock opening reinforcement is HPB300φ10, the outer dimension of the lock opening is 3m×3.5m, the inner dimension of the lock opening is 2m×2.5m, the height of the lock opening is 50cm, and it is 10cm higher than the original ground.

3. The construction method for rotary drilling of rectangular cross-section anti-slide piles according to claim 2, characterized in that: The large-diameter round drill bit has a diameter of 200cm, and the small-diameter round drill bit has a diameter of 80cm.

4. The construction method for rotary drilling of rectangular cross-section anti-slide piles according to claim 2, characterized in that: The specific implementation of step S6 is as follows: after the peripheral hole excavation in step S5 is completed, the hole wall below the inner wall of the lock opening is trimmed using a rectangular shearing steel groove until the size of the anti-slip pile hole is consistent with the size of the inner wall of the lock opening.

Images