Punching pile stone layer rotary drilling reinforced retaining wall drill hole construction method

Abstract

The present application relates to the technical field of cast-in-place piles, and discloses a method for forming a hole by using a rotary drilling rig with a rock retaining drill bit for a rock filling layer of a cast-in-place pile, which comprises the following steps: 1) positioning the rotary drilling rig, drilling into the top of the rock filling layer in the pile hole by using the soil drill bit of the rotary drilling rig, and stopping drilling; 2) replacing the soil drill bit with the rock retaining drill bit by the rotary drilling rig; 3) lifting the rock retaining drill bit by the rotary drilling rig, and transporting the rock to outside the pile hole; 4) after lowering the reinforcement cage into the pile hole, pouring concrete into the pile hole through the guide pipe until the concrete fills the pile hole; the drill cylinder receives the falling rock in the rock filling layer of the pile hole by the rock retaining plate, so that the rock does not directly fall on the drill cylinder, the drill cylinder is separated from the rock retaining plate by the reinforcing plate, the protection of the drill cylinder is increased, the reinforcing plate is used as the support bearing capacity of the rock retaining plate, and the falling rock can be transported out of the pile hole by the rock retaining plate during the movement of the rock retaining drill bit out of the pile hole.

Description

Technical Field

[0001] This invention relates to the technical field of cast-in-place piles, and more specifically, to a method for drilling holes in cast-in-place piles using a rotary drilling and reinforced rock-holding drill bit. Background Technology

[0002] Rotary drilling cast-in-place piles are widely used in cast-in-place pile construction due to their high construction efficiency, ease of construction management, and low mud waste generated during construction.

[0003] When rotary drilling rigs are drilling in rock-filled areas, the constant friction between the rocks and the drill bit during the drilling process causes wear on the reinforcing ribs at the top of the drill bit. At the same time, the rocks are very loose and easily affected by the disturbance of drilling operations, causing them to fall and damage the drill bit components. This reduces the connection strength between the mechanical drill rod and the drill bit, and reduces torque. If the rocks fall between the cylinder wall and the borehole wall, it will increase the resistance of the drill bit's rotation, leading to increased friction in rotary drilling and making drilling difficult. In cases where the connection strength between the drill rod and the drill bit is weak, drilling operations may even cause the rotary drill bit to fall off. Summary of the Invention

[0004] The purpose of this invention is to provide a method for drilling holes in cast-in-place piles with reinforced rock-holding drill bits, aiming to solve the problem in the prior art where drilling construction may even lead to the rotary drill bit falling off when the connection strength between the drill rod and the drill bit is weak.

[0005] This invention is implemented as follows: a method for drilling holes in a cast-in-place pile with reinforced rock retaining layer using a rotary drilling drill bit, comprising the following construction steps:

[0006] 1) Install casing in the pile position at the construction site, level and compact the construction site, position the rotary drilling rig, and use the rotary drilling rig with soil drill bit to start drilling in the soil layer of the casing to form a pile position hole. Use the soil drill bit of the rotary drilling rig to drill in the pile position hole until the top of the rock filling layer and stop drilling.

[0007] 2) The rotary drilling rig replaces the soil layer drill bit with a rock-stopping drill bit. The rock-stopping drill bit includes a drill cylinder and a connector for connecting the drill rod. The bottom of the connector abuts against the top of the drill cylinder. The top of the connector is provided with a rock-stopping plate to receive the falling stones in the filling layer. The rock-stopping plate is arranged horizontally, and the bottom of the rock-stopping plate is arranged relatively at intervals with the top of the drill cylinder to form a support area.

[0008] The connector has multiple reinforcing ribs on its outer periphery that extend away from the connector to the bottom outer edge of the retaining plate. The multiple reinforcing ribs are arranged at intervals along the outer periphery of the connector, and all of the multiple reinforcing ribs are located in the support area.

[0009] 3) During the process of the rotary drilling rig driving the drill rod and the drill cylinder to drill into the rock filling layer in the pile hole, the falling stones in the rock filling layer are caught by the rock retaining plate. When the top of the rock retaining plate catches too many stones or large-diameter stones fall, the drilling is stopped and the rotary drilling rig is used to lift the rock retaining drill bit to transport the stones to the outside of the pile hole.

[0010] 4) After the rock-blocking drill bit of the rotary drilling rig drills a hole in the pile location hole and cleans the hole, the steel cage is lowered into the pile location hole, and then the guide pipe is lowered into the pile location hole. Concrete is poured into the pile location hole through the guide pipe until the concrete fills the pile location hole.

[0011] Furthermore, in the construction step 2), the middle part of the retaining plate has an installation hole for the connector to pass through and fit, the inner sidewall of the installation hole abuts against the outer sidewall of the connector, and the top end face of the connector is flush with the top end face of the retaining plate or the top end face of the connector is higher than the top end face of the retaining plate.

[0012] Furthermore, the top of the drill barrel is provided with multiple through holes for mud flow; the rock retainer plate is provided with multiple flow holes for mud flow, and the multiple flow holes are arranged intermittently around the circumference of the rock retainer plate, and the flow holes are connected to the through holes.

[0013] Furthermore, in construction step 2), the diameter of the retaining plate is the same as the diameter of the pile hole.

[0014] Furthermore, in the construction step 2), the reinforcing rib plate is provided with a connecting hole for mud flow, and the connecting hole is connected to the flow hole and the through hole respectively.

[0015] Furthermore, in construction step 2), the bottom of the reinforcing rib plate is welded to the top of the drill barrel, and the top of the reinforcing rib plate is welded to the bottom of the retaining stone plate.

[0016] Furthermore, in the construction step 2), the adjacent reinforcing ribs are arranged vertically.

[0017] Furthermore, in the construction step 2), a plurality of protective plates for protecting the reinforcing ribs are provided on the outer periphery of the drill barrel, and the plurality of protective plates are arranged at intervals around the outer periphery of the drill barrel; the lower part of the protective plate is fixed to the drill barrel, the upper part of the protective plate is exposed on the top of the drill barrel, and the upper part of the protective plate abuts against the outer side of the reinforcing ribs.

[0018] Furthermore, the stone retaining plate has an upwardly extending protective tube, the protective tube has a hollow hole communicating with the mounting hole, the protective tube and the connector are arranged longitudinally opposite each other, a swing rod is sleeved on the outer periphery of the protective tube, the swing rod is arranged horizontally, the inner end of the swing rod is connected to the outer periphery of the protective tube through a bearing, and the outer end of the swing rod extends to the outer periphery edge of the stone retaining plate.

[0019] The swing rod has two sides with scraping end faces for removing stones or silt that block the flow hole. The scraping end faces are arranged at an angle from top to bottom. The bottom of the swing rod is movably abutted against the top of the stone-blocking plate.

[0020] In the construction step 3), when the drill rod drives the rock-blocking drill bit to rotate, the drill cylinder drives the rock-blocking plate to rotate. When the boulders or silt blocking the flow hole actively contact the removal end face of the swing rod, the swing rod is pushed by the boulders or silt and generates inertial rotation.

[0021] After the drill rod drives the rock-stopping drill bit to be raised outside the pile hole, the drill rod drives the rock-stopping drill bit to rotate, thereby controlling the swing rod to passively clean the rocks or silt on the rock-stopping plate.

[0022] Furthermore, the top of the retaining plate is provided with a main push block protruding upwards. The main push block and the swing rod are arranged horizontally. The swing rod is provided with a notch for the main push block to collide with the inertial force. The notch is located on the scraping end face. The outer periphery of the main push block is provided with an elastically deformable protective ring. The protective ring is arranged around the outer periphery of the main push block.

[0023] In the construction step 3), as the drill rod drives the rock-stopping drill bit to rotate, the rock-stopping plate drives the main push block to rotate due to inertia.

[0024] Compared with existing technologies ， The present invention provides a method for drilling holes in a cast-in-place pile with a reinforced rock-holding drill bit. The drill cylinder uses a rock-holding plate to catch falling rocks from the rock-fill layer of the pile hole, preventing the rocks from directly hitting the drill cylinder. A reinforcing rib separates the drill cylinder from the rock-holding plate, increasing the protection of the drill cylinder. The reinforcing rib also serves as a support for the rock-holding plate. During the removal of the rock-holding drill bit from the pile hole, the falling rocks can be transported out of the hole via the rock-holding plate. This method solves the problem that drilling operations with weak connections between the drill rod and the drill bit may even result in the rotary drill bit falling off. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the construction process of the rotary drilling and reinforced rock retaining drill bit construction method for cast-in-place piles with rock filling layers provided by the present invention;

[0026] Figure 2This is a construction schematic diagram of the method for drilling holes in a cast-in-place pile with a rotary drilling and reinforced rock retaining layer provided by the present invention;

[0027] Figure 3 This is a three-dimensional structural schematic diagram of the rock-stopping drill bit provided by the present invention;

[0028] Figure 4 This is a top view of the retaining wall provided by the present invention.

[0029] Figure 5 This is a side view of the retaining wall structure provided by the present invention.

[0030] In the diagram: 100 pile hole, 200 rotary drilling rig, 300 drill rod, 400 rock-stopping drill bit, 500 drill barrel, 600 connector, 700 rock-stopping plate, 800 support area, 501 through hole, 502 protective plate, 601 reinforcing rib plate, 602 connecting hole, 701 mounting hole, 702 flow hole, 703 protective pipe, 704 swing rod, 705 bearing, 706 removal end face, 707 main push block, 708 notch, 709 protective ring. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0033] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] Reference Figures 1-5 The image shows a preferred embodiment of the present invention.

[0035] The construction method for rotary drilling and reinforced rock-holding piles in rock-filled layers includes the following steps:

[0036] 1) Install casing in the pile position at the construction site, level and compact the construction site, position the rotary drilling rig 200, use the rotary drilling rig 200 with soil drill bit to start drilling in the soil layer of the casing to form pile position hole 100, use the soil drill bit of rotary drilling rig 200 to drill in the pile position hole 100 to the top of the rock filling layer and stop drilling.

[0037] 2) The rotary drilling rig 200 replaces the soil layer drill bit with a rock-stopping drill bit 400. The rock-stopping drill bit 400 includes a drill barrel 500 and a connector 600 for connecting the drill rod 300. The bottom of the connector 600 abuts against the top of the drill barrel 500. The top of the connector 600 is provided with a rock-stopping plate 700 to receive falling stones in the rock filling layer. The rock-stopping plate 700 is arranged horizontally, and the bottom of the rock-stopping plate 700 and the top of the drill barrel 500 are arranged at intervals to form a support area 800.

[0038] The connector 600 has a plurality of reinforcing ribs 601 extending away from the connector 600 to the bottom outer edge of the retaining plate 700 on its outer periphery. The plurality of reinforcing ribs 601 are arranged at intervals along the outer periphery of the connector 600 and are all located in the support area 800.

[0039] 3) During the process of the rotary drilling rig 200 driving the drill rod 300 and the drill barrel 500 to drill into the rock filling layer in the pile hole 100, the falling stones in the rock filling layer are caught by the rock retaining plate 700. When the top of the rock retaining plate 700 catches too many stones or large-diameter stones fall, the drilling is stopped and the rock retaining drill bit 400 is lifted by the rotary drilling rig 200 to transport the stones to the outside of the pile hole 100.

[0040] 4) Until the rock-stopping drill bit 400 of the rotary drilling rig 200 drills and cleans the hole in the pile hole 100, after the steel cage is lowered into the pile hole 100, the guide pipe is lowered into the pile hole 100, and concrete is poured into the pile hole 100 through the guide pipe until the concrete fills the pile hole 100.

[0041] The above-mentioned method for drilling holes in the rock-filled layer of cast-in-place piles using a rotary drilling rig with reinforced rock retaining plate 700 uses a rock retaining plate 700 to catch falling rocks from the rock-filled layer of the pile hole, preventing the rocks from directly hitting the drill cylinder 500. A reinforcing rib 601 separates the drill cylinder 500 from the rock retaining plate 700, increasing the protection of the drill cylinder 500. The reinforcing rib 601 also serves as the supporting load-bearing capacity for the rock retaining plate 700. During the process of the rock retaining drill bit 400 being moved out of the pile hole, the falling rocks can be transported out of the pile hole through the rock retaining plate 700. This method solves the problem that drilling operations with weak connection strength between the drill rod 300 and the drill bit may even lead to the rotary drilling bit falling off.

[0042] In construction step 2), the middle of the retaining plate 700 has an installation hole 701 for the connector 600 to pass through and fit into. The inner side wall of the installation hole 701 abuts against the outer side wall of the connector 600, which can increase the connection and positioning between the retaining plate 700 and the connector 600. The top end face of the connector 600 is flush with the top end face of the retaining plate 700, so that the retaining plate 700 can be pressed against the reinforcing plate 601 by the drill rod 300; or the top end face of the connector 600 is higher than the top end face of the retaining plate 700, which can improve the convenience of installation and disassembly of the retaining plate 700 and the connector 600.

[0043] The top of the drill barrel 500 is provided with multiple through holes 501 for mud flow; the retaining plate 700 is provided with multiple flow holes 702 for mud flow, and the multiple flow holes 702 are arranged intermittently around the circumference of the retaining plate 700, and the flow holes 702 are connected to the through holes 501; in this way, the wall protection mud can flow during the construction process.

[0044] In construction step 2), the diameter of the retaining plate 700 is the same as the diameter of the pile hole 100; in this way, the retaining plate 700 can fully bear the stones falling from the filling layer of the pile hole 100, and can also prevent the stones from falling onto the outer wall of the drill barrel 500 and increasing the frictional resistance.

[0045] In construction step 2), the reinforcing rib plate 601 is provided with a connecting hole 602 for the flow of mud, and the connecting hole 602 is connected to the flow hole 702 and the through hole 501 respectively; in this way, the wall protection mud can flow during the construction process.

[0046] In construction step 2), the bottom of the reinforcing rib plate 601 is welded to the top of the drill barrel 500, and the top of the reinforcing rib plate 601 is welded to the bottom of the rock retaining plate 700. This increases the connection between the reinforcing rib plate 601 and the drill barrel 500, thereby providing stable support for the reinforcing rib plate 601, increasing the connection between the reinforcing rib plate 601 and the rock retaining plate 700, and protecting the drill barrel 500.

[0047] In construction step 2), adjacent reinforcing ribs 601 are arranged vertically; this increases the load-bearing capacity of the retaining wall 700.

[0048] In this embodiment, in construction step 2), a plurality of protective plates 502 for protecting the reinforcing rib plate 601 are provided on the outer periphery of the drill barrel 500. The plurality of protective plates 502 are arranged at intervals around the outer periphery of the drill barrel 500. The lower part of the protective plate 502 is fixed on the drill barrel 500, the upper part of the protective plate 502 is exposed on the top of the drill barrel 500, and the upper part of the protective plate 502 abuts against the outer side of the reinforcing rib plate 601.

[0049] The drill barrel 500 protects the reinforcing rib plate 601 with the protective plate 502 to reduce the damage to the reinforcing rib plate 601 caused by rock friction during the drilling process.

[0050] In this embodiment, the retaining plate 700 has an upwardly extending protective tube 703. The protective tube 703 has a hollow hole communicating with the mounting hole 701. The protective tube 703 and the connector 600 are arranged longitudinally opposite each other. A swing rod 704 is sleeved on the outer periphery of the protective tube 703. The swing rod 704 is arranged horizontally. The inner end of the swing rod 704 is connected to the outer periphery of the protective tube 703 through a bearing 705. The outer end of the swing rod 704 extends to the outer periphery edge of the retaining plate 700.

[0051] The swing rod 704 has two sides with scraping end faces 706 for scraping away stones or silt that block the flow hole 702. The scraping end faces 706 are arranged at an angle from top to bottom. The bottom of the swing rod 704 is movably abutting against the top of the stone retaining plate 700.

[0052] In construction step 3), when the drill rod 300 drives the rock-blocking drill bit 400 to rotate, the drill barrel 500 drives the rock-blocking plate 700 to rotate. When the boulders or silt blocking the flow hole 702 actively contact the removal end face 706 of the swing rod 704, the swing rod 704 is pushed by the boulders or silt and generates inertial rotation.

[0053] The drill pipe 300 drives the drill barrel 500 to rotate, which in turn drives the retaining plate 700 to rotate. This causes the stones on the top of the retaining plate 700 to collide with the swing rod 704. The swing rod 704 is pushed by the stones or silt and rotates due to inertia. This allows the swing rod 704 to remove the stones or silt blocking the flow hole 702 by scraping the end face 706. When the drill pipe 300 drives the retaining drill bit 400 to be raised outside the pile hole 100, the drill pipe 300 drives the retaining drill bit 400 to rotate, thereby controlling the swing rod 704 to passively clean the stones or silt on the retaining plate 700.

[0054] In this embodiment, the top of the retaining plate 700 is provided with a main push block 707 protruding upwards. The main push block 707 and the swing rod 704 are arranged horizontally. The swing rod 704 is provided with a notch 708 for the main push block 707 to collide inertially. The notch 708 is located on the scraping end face 706. The outer periphery of the main push block 707 is provided with an elastically deformable protective ring 709. The protective ring 709 is arranged around the outer periphery of the main push block 707.

[0055] In construction step 3), as the drill rod 300 drives the rock-stopping drill bit 400 to rotate, the rock-stopping plate 700 drives the main push block 707 to rotate the swing rod 704 due to inertia.

[0056] The drill pipe 300 drives the drill barrel 500 to rotate, and the drill barrel 500 drives the rock retainer 700 to rotate, so that the rock retainer 700 drives the main push block 707 to collide with the notch 708 of the swing rod 704, causing the swing rod 704 to rotate due to inertia, so that the swing rod 704 removes the rocks or silt on the rock retainer 700 by scraping the end face 706.

[0057] The swing arm 704 uses the notch 708 to increase its own protection and also to protect the main push block 707, preventing the removal end face 706 from damaging the main push block 707. The protective ring 709 is used to increase the protection of the main push block 707 when it pushes the swing arm 704 by inertia.

[0058] 1. Fabrication and transportation of 400mm rock-stopping drill bit

[0059] (1) The rock-stopping drill bit 400 in this construction method is manufactured in the factory according to the design drawings. The finished product is directly transported to the site. After the rock-stopping drill bit 400 is transported to the site, the site personnel check the overall structure and various index parameters of the rock-stopping drill bit 400 to ensure that the drill bit itself is qualified before it can be used.

[0060] (2) The overall diameter of the rock-stopping drill bit 400 is 1120mm and the overall length is about 2m; the overall thickness of the rock-stopping plate 700 is 300mm, and the plate has 4 holes of 120mm×360mm to facilitate the flow of the wall-protecting mud in the hole during the drilling process.

[0061] (3) While thickening the four reinforcing ribs 601, extend them to the bottom of the rock retaining plate 700 and weld them to it. Weld a 20mm thick protective plate 502 to the reinforcing ribs 601 on the outside of the drill barrel 500 to reduce the damage to the reinforcing ribs 601 caused by rock friction during drilling.

[0062] 2. Rotary drilling rig 200 replaces rock-stop drill bit 400

[0063] When constructing rotary cast-in-place piles in the rock-fill layer on site, the drill bit can be replaced with the rock-stopping drill bit 400 described in this construction method. After replacing with the rock-stopping drill bit 400, ensure that the connection between the drill rod 300 and the rock-stopping drill bit 400 is stable to avoid affecting the construction.

[0064] 3. The rotary drilling rig is positioned at 200mm and begins rotary drilling to form a hole.

[0065] After the rock-stopping drill bit 400 is replaced, the rotary drilling rig 200 can be positioned to begin drilling. During the construction process, pay close attention to the situation of falling rocks when drilling through the rock-filled layer. If there are too many rocks on the top of the rock-stopping plate 700 or large-diameter rocks fall onto the rock-stopping plate 700, stop drilling in time, raise the drill bit, and remove the rocks from the hole.

[0066] 4. Reinforcing cage hoisting and concrete pouring.

[0067] After rotary drilling and hole cleaning are completed, and the thickness of the sediment at the bottom of the hole meets the construction requirements, the reinforcing cage can be lowered. The reinforcing cage is lowered using a crane. During hoisting, the cage is aligned with the hole position, lifted straight and stabilized, and lowered slowly to avoid touching the hole wall and prevent the hole wall from collapsing. Once the reinforcing cage is lowered, concrete pouring can begin. Concrete pouring should be carried out continuously to avoid pipe blockage and pouring accidents.

[0068] The overall construction process of using the rock-stop drill bit 400 is basically the same as the traditional rotary drilling process. When the rotary drilling rig 200 is used in the rock-filled strata, the rock-stop drill bit 400 is used directly. Under the premise of ensuring the quality of the hole, the rock-stop drill bit 400 is more durable and does not require additional mechanical equipment, reducing the number of process changes. This not only saves labor, machinery and material costs, but also improves the overall construction efficiency.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for drilling reinforced rock-filled layers with rotary drilling drill bits for cast-in-place piles, characterized in that, The construction steps include the following: 1) Install casing in the pile position at the construction site, level and compact the construction site, position the rotary drilling rig, and use the rotary drilling rig with soil layer drill bit to start drilling in the soil layer of the casing to form a pile position hole. Use the soil layer drill bit of the rotary drilling rig to drill in the pile position hole to the top of the rock filling layer and stop drilling. 2) The rotary drilling rig replaces the soil layer drill bit with a rock-stopping drill bit. The rock-stopping drill bit includes a drill cylinder and a connector for connecting the drill rod. The bottom of the connector abuts against the top of the drill cylinder. The top of the connector is provided with a rock-stopping plate to receive the falling stones in the rock filling layer. The rock-stopping plate is arranged horizontally, and the bottom of the rock-stopping plate is arranged relatively at intervals with the top of the drill cylinder to form a support area. The connector has multiple reinforcing ribs on its outer periphery that extend away from the connector to the bottom outer edge of the retaining plate. The multiple reinforcing ribs are arranged at intervals along the outer periphery of the connector, and all of the multiple reinforcing ribs are located in the support area. 3) During the process of the rotary drilling rig driving the drill rod and the drill cylinder to drill into the rock filling layer in the pile hole, the falling stones in the rock filling layer are caught by the rock retaining plate. When the top of the rock retaining plate catches too many stones or large-diameter stones fall, the drilling is stopped and the rotary drilling rig is used to lift the rock retaining drill bit to transport the stones to the outside of the pile hole. The top of the drill barrel is provided with multiple through holes for mud flow; the rock retainer plate is provided with multiple flow holes for mud flow, and the multiple flow holes are arranged in a circumferential manner around the rock retainer plate, and the flow holes are connected to the through holes. The stone retaining plate has an upwardly extending protective tube, which has a hollow hole communicating with the mounting hole. The protective tube and the connector are arranged longitudinally opposite each other. A swing rod is sleeved on the outer periphery of the protective tube. The swing rod is arranged horizontally. The inner end of the swing rod is connected to the outer periphery of the protective tube through a bearing. The outer end of the swing rod extends to the outer periphery edge of the stone retaining plate. The swing rod has two sides with scraping end faces for removing stones or silt that block the flow hole. The scraping end faces are arranged at an angle from top to bottom. The bottom of the swing rod is movably abutted against the top of the stone-blocking plate. As the drill rod drives the rock-stopping drill bit to rotate, the drill cylinder drives the rock-stopping plate to rotate. When the boulders or silt blocking the flow hole actively contact the removal end face of the swing rod, the swing rod is pushed by the boulders or silt and generates inertial rotation. After the drill rod drives the rock-stopping drill bit to be raised outside the pile hole, the drill rod drives the rock-stopping drill bit to rotate, thereby controlling the swing rod to passively clean the rocks or silt on the rock-stopping plate. The top of the retaining plate has a main push block protruding upwards. The main push block and the swing rod are arranged horizontally. The swing rod has a notch for the main push block to collide with the main push block by inertia. The notch is located on the scraping end face. The outer periphery of the main push block has an elastically deformable protective ring, which is arranged around the outer periphery of the main push block. As the drill rod drives the rock-stopping drill bit to rotate, the rock-stopping plate drives the main push block to rotate the swing rod by inertia. 4) After the rock-blocking drill bit of the rotary drilling rig drills a hole in the pile location hole and cleans the hole, the steel cage is lowered into the pile location hole, and then the guide pipe is lowered into the pile location hole. Concrete is poured into the pile location hole through the guide pipe until the concrete fills the pile location hole.

2. The method for drilling holes in a cast-in-place pile with reinforced rock retaining layer using a rotary drilling bit as described in claim 1, characterized in that... In construction step 2), the middle part of the retaining plate has an installation hole for the connector to pass through and fit. The inner sidewall of the installation hole abuts against the outer sidewall of the connector. The top end face of the connector is flush with the top end face of the retaining plate or the top end face of the connector is higher than the top end face of the retaining plate.

3. The method for drilling holes in a cast-in-place pile with reinforced rock retaining layer using a rotary drilling drill bit as described in claim 2, characterized in that... In construction step 2), the diameter of the retaining plate is the same as the diameter of the pile hole.

4. The method for drilling holes in a cast-in-place pile with reinforced rock retaining layer using a rotary drilling drill bit as described in claim 2, characterized in that... In construction step 2), the reinforcing rib plate is provided with a connecting hole for mud flow, and the connecting hole is connected to the flow hole and the through hole respectively.

5. The method for drilling holes in a cast-in-place pile with reinforced rock retaining layer using a rotary drilling drill bit as described in any one of claims 1 to 4, characterized in that... In construction step 2), the bottom of the reinforcing rib is welded to the top of the drill barrel, and the top of the reinforcing rib is welded to the bottom of the retaining plate.

6. The method for drilling holes in a cast-in-place pile with reinforced rock retaining layer using a rotary drilling drill bit as described in any one of claims 1 to 4, characterized in that, In construction step 2), the adjacent reinforcing ribs are arranged vertically.

7. The method for drilling holes in a cast-in-place pile with reinforced rock retaining layer using a rotary drilling drill bit as described in any one of claims 1 to 4, characterized in that... In construction step 2), a plurality of protective plates for protecting the reinforcing ribs are provided on the outer periphery of the drill barrel. The plurality of protective plates are arranged at intervals around the outer periphery of the drill barrel. The lower part of the protective plate is fixed to the drill barrel, the upper part of the protective plate is exposed on the top of the drill barrel, and the upper part of the protective plate abuts against the outer side of the reinforcing ribs.

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