A construction method for removing obstacle piles in a rotary excavator in a complex environment

Abstract

The application discloses a construction method for removing obstacle piles in complex environments by a rotary excavator, and comprises the following steps: S1, finding obstacle piles; S2, collecting obstacle pile coordinates; S3, performing small-strain detection on the obstacle piles; S4, backfilling the obstacle piles; S5, obstacle pile coordinate lofting; S6, installing a pile driver on the rotary excavator; S7, lowering a full pile guard on the rotary excavator; S8, installing a core drill on the rotary excavator to pull out the pile; S9, replacing a rock-embedded short auger on the rotary excavator to pull out the pile; and S10, taking out the full pile guard to backfill the pile hole. The application has the advantages that site conditions are less limited, on-site implementation is more flexible, the method is more widely applicable than the existing full-rotary full-pile-guard pile pulling method, the rotary excavator is safer, more economical, more efficient, and more operable in removing obstacle piles, and is especially suitable for removing non-full-cage obstacle piles.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a construction method for using a rotary drilling rig to remove obstacle piles in complex environments. Background Technology

[0002] With the continuous development of my country's construction industry, the continuous improvement of urbanization, the constant renewal of urban landscapes, the emergence of various building forms, the continuous demolition and renovation of old urban areas, and the increasing number of new construction projects in urban areas, construction conditions are becoming increasingly complex. During construction in urban areas, especially in the foundation construction stage, obstacles are often encountered. Previously, common foundation types for older buildings included independent column foundations, strip foundations, pile caps, and pile raft foundations. While independent foundations and strip foundations are relatively simple to handle, underground obstacle piles are more difficult to deal with. Currently, the combination of full-rotation drilling rigs and crawler cranes used on-site is expensive and inefficient, making it difficult to implement under complex conditions and limiting site conditions. Furthermore, traditional impact drilling has a significant impact on the surrounding environment and does not completely clear obstacles, posing potential risks to later construction of pile foundations, foundation pit support, and foundation pit waterproofing, making it difficult to guarantee quality. Therefore, how to completely remove obstacle piles while minimizing the impact on the surrounding environment and buildings, without affecting subsequent pile foundation, foundation pit support, and waterproofing construction, has become an urgent problem to be solved. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a construction method for clearing obstacle piles in complex environments using a rotary drilling rig, comprising the following steps: S1. Obstacle piles found: Obstacles are found. Use a pickaxe to remove the upper foundation or pile cap and find obstacle piles that affect the construction of the pile foundation. S2. Obstacle stake coordinate acquisition: Obstacle stake head cleaning: Completely expose the obstacle stake head, measure the obstacle stake diameter with a tape measure, and collect and record the center coordinates of the obstacle stake position using instruments such as GPS. S3. Perform small strain testing on obstacle piles: After the coordinates of the obstacle piles are collected, perform small strain testing on the obstacle piles in a timely manner, measure the length of the obstacle piles and record it. S4. Backfilling the obstacle piles: After the obstacle pile information is collected, backfill and compact the area around the obstacle piles, and lay steel plates, etc., to ensure the safety of the rotary drilling rig operation. S5. Obstacle pile coordinate layout: After the ground leveling is completed, the obstacle pile positions are laid out, and the center of the obstacle pile position is marked with a rebar head; S6. Install the casing drive on the rotary drilling rig: Remove the pressure plate on the power head of the rotary drilling rig and install the casing drive; S7. Rotary drilling rig lower casing: The casing driver connects to the initial casing section. The rotary drilling rig torque and the cutter head at the end of the initial casing section cut the soil and press the casing in. After the initial section is completely pressed into the soil, the casing is extended and the middle section of the casing is installed. S8. Rotary drilling rig installation of core drill for pile extraction: Based on the basic information of the pile foundation design in the previous building drawings, or the information of the obstacle piles collected during obstacle removal, select a core drill of appropriate diameter, twist and remove the obstacle piles in sections until the pile body is completely removed. The twisted pile concrete on site should be cleaned up, piled up, and transported away in a timely manner. S9. Rotary drilling rig replaced with rock-socketed short auger for pile extraction: The rotary drilling rig is replaced with a rock-socketed short auger to complete the pile body that was not completely cleaned in S8. S10. Remove the entire casing and backfill the pile hole: Remove the rotary drilling rig bit and use the rotary drilling rig power unit and casing driver to pull out the long casing in sections.

[0004] Preferably, in step S1, GPS or a total station is used to mark the pile locations to be constructed, or exploratory trenches are dug during the construction of the support structure to discover obstacles.

[0005] Preferably, in step S7, the initial sections of the casing are fixed together using casing connecting bolts and casing fixing pins.

[0006] Preferably, in step S8, the core drill has three specifications: a core drill with a diameter 20 cm larger than the obstacle pile, a core drill with the same diameter as the obstacle pile, and a core drill bit with a diameter 10 cm smaller than the obstacle pile.

[0007] Preferably, in step S9, with the obstacle pile fully encased in the casing, the obstacle pile is broken and crushed using a rotary drilling rig with high torque inside the casing. After the rotary drilling rig has drilled to a certain depth, a sand-dredging drill is used to remove the broken concrete fragments and short steel bars until the obstacle pile is completely removed.

[0008] Preferably, in step S10, while pulling out the casing, an excavator is used to backfill the pile hole inside the casing to ensure that the backfilled cement soil is dense and of good quality, which facilitates the later pile foundation construction and avoids the collapse of the hole during the pile foundation construction process.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Fewer site restrictions and greater flexibility in on-site implementation; wider applicability compared to existing full-spindle drilling rigs. Full-spindle drilling rigs require the obstacle pile to be about 3 meters away from the building, while rotary drilling rigs are more flexible and can successfully remove the obstacle pile at a distance of about 1.5 meters.

[0010] 2. Compared with the combination of full-circuit casing and crawler crane, rotary drilling rigs are safer, more economical, more efficient and more operable in clearing obstacle piles, especially suitable for clearing non-full-cage obstacle piles.

[0011] 3. Rotary drilling rigs are currently quite common. Compared with traditional impact drills, they have less impact on the surrounding environment, higher implementation efficiency, more thorough cleaning, and easier assurance of subsequent construction quality.

[0012] 4. It is especially suitable for on-site pile foundation construction using rotary drilling rigs, as it does not affect obstacle removal or pile foundation construction, making it more feasible. The mutual interference between pile extraction and pile foundation construction is minimal, which is conducive to the progress of the project.

[0013] It is highly mechanized, requires less manpower, and is highly efficient. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a rotary drilling rig. Figure 2 This is a schematic diagram of the casing drive unit for a rotary drilling rig. Figure 3 This is a schematic diagram of the long casing of a rotary drilling rig. Figure 4 This is a schematic diagram of a rotary drilling rig's core drill. Figure 5 This is a schematic diagram of a short auger rock-embedded drill bit for a rotary drilling rig. Figure 6 This is a schematic diagram of a rotary drilling rig for sand retrieval.

[0015] In the diagram: 1-Rotary drilling rig; 2-Rotary drilling rig power head; 3-Pressure plate; 5-Casing drive; 6-Casing fixing pin; 7-Long casing; 8-Casing connecting bolt; 11-Coring drill; 12-Sand dredging drill; 13-Short spiral rock-embedded drill. Detailed Implementation

[0016] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the embodiments described.

[0017] Reference Figures 1 to 6 The present invention discloses a construction method for clearing obstacle piles in complex environments using a rotary drilling rig, comprising the following steps: Step 1: Locate the obstacle stake; Use GPS or a total station to mark the locations of the piles to be constructed, or dig trenches during the construction of the support structure. If obstacles are found, use a pickaxe to remove the upper foundation or pile cap. If obstacles affecting the pile foundation construction are found, clean up the surrounding concrete debris and scrap steel bars, and pump out the surrounding water.

[0018] Step 2: Collect the coordinates of the obstacle stakes; Clean the heads of the obstacle stakes to completely expose them. Measure the diameter of the obstacle stakes with a tape measure and record the center coordinates of the obstacle stakes using instruments such as GPS.

[0019] Step 3: Perform small strain testing on the obstacle stakes; After the coordinates of the obstacle stakes are collected, small strain tests are performed on the obstacle stakes in a timely manner to detect the stake length and record it.

[0020] Step 4: Backfill the obstacle piles; After the obstacle pile information is collected, the area around the obstacle pile is backfilled and compacted, and steel plates are laid to ensure the safe operation of rotary drilling rig 1.

[0021] Step 5: Locate the coordinates of the obstacle stakes; After the ground is leveled, the positions of the obstacle piles are marked, and the center of the obstacle pile positions is marked with the rebar ends.

[0022] Step 6: Install the casing driver 5 on the rotary drilling rig; Remove the upper pressure plate 3 of the rotary drilling rig power head 2 and install the casing drive 5.

[0023] Step 7: Lower the full casing of the rotary drilling rig; Based on the length of the obstacle pile detected by small strain testing and the diameter of the obstacle pile measured, a suitable casing diameter and length are selected. The casing driver 5 is connected to the initial section of the casing. The initial sections of the casing are fixed together using casing connecting bolts 8 and casing fixing pins 6. The casing is pressed in by using the torque of the rotary drilling rig and the cutting head at the end of the initial section of the casing to cut the soil. The center of the casing is made to coincide with the center of the obstacle pile position as much as possible. After the initial section is completely pressed into the soil, the casing 7 is extended and the middle section of the casing is installed until the casing is buried to approximately the same length as the obstacle pile. During this process, the center of the entire casing is kept consistent with the center of the pile position.

[0024] Step 8: Install the core drill and extract the pile using a rotary drilling rig. Based on the basic information of the pile foundation design in the early building drawings, or the information of the obstacle piles collected during the clearing process, select a core drill bit of appropriate diameter 11. There are generally three specifications of core drill bit: core drill bit 11 with a diameter 20 cm larger than the obstacle pile, core drill bit with the same diameter as the obstacle pile, and core drill bit 11 with a diameter 10 cm smaller than the obstacle pile. First, a core drill with a diameter 20 cm larger than the obstacle pile is selected to remove the casing and soil around the obstacle pile, as well as some concrete (considering pile foundation enlargement and filling). Next, a core drill of the same diameter as the obstacle pile (Drill 11) is used to remove the reinforcing steel bars from the obstacle pile. After removing a section of reinforcing steel, a core drill 11 with a diameter 10 cm smaller is used to tighten the obstacle pile head. When the core drill 11 cannot tighten the obstacle pile, concrete fragments are added directly between the obstacle pile and the casing to secure the core drill 11 to the top of the obstacle pile. The torque of a rotary drilling rig is then used to twist and remove the obstacle pile in sections. This process is repeated until the pile body is completely removed. The twisted concrete from the pile body is promptly cleaned up, piled, and transported off-site.

[0025] Step 9: Replace the rock-socketed short auger with a rotary drilling rig to extract the pile 13; If the progress in step 8 is not smooth, it is advisable to replace the rotary drilling rig with a rock-embedded short auger 13. With the obstacle pile fully encased in the casing, the high torque of the rotary drilling rig is used to break and crush the obstacle pile inside the casing. After the rotary drilling rig has drilled to a certain depth, a sand-retrieving drill 12 is used to remove the broken concrete fragments and short steel bars until the obstacle pile is completely removed. The completeness of the obstacle pile can be judged by the output torque of the rotary drilling rig and the vibration of the rotary drilling rig. After it is determined that the obstacle pile has been completely destroyed, the sand-retrieving drill 12 is used to remove the concrete debris and scrap steel bars inside the casing. The complete removal of debris is judged by the output torque of the rotary drilling rig and the amount of excavated soil removed by the drill bit.

[0026] Step 10: Remove the entire casing and backfill the pile hole; After the obstacle piles in steps 8 and 9 are completely cleared, the rotary drilling rig bit is removed, and the long casing 7 is pulled out in sections using the rotary drilling rig power head 2 and casing driver. At the same time as pulling out the casing, the excavator is used to backfill the pile hole inside the casing to ensure that the backfill cement soil is dense and of good quality, which is conducive to the later pile foundation construction and avoids the collapse of the hole during the pile foundation construction process.

[0027] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A construction method for clearing obstacle piles in complex environments using a rotary drilling rig, characterized in that, Includes the following steps: S1. Obstacle piles found: Obstacles are found. Use a pickaxe to remove the upper foundation or pile cap and find obstacle piles that affect the construction of the pile foundation. S2. Obstacle stake coordinate acquisition: Obstacle stake head clearing: Completely expose the obstacle stake head, measure the obstacle stake diameter with a tape measure, and use a GPS instrument to collect and record the center coordinates of the obstacle stake position. S3. Perform small strain testing on obstacle piles: After the coordinates of the obstacle piles are collected, perform small strain testing on the obstacle piles in a timely manner, measure the length of the obstacle piles and record it. S4. Backfilling the obstacle piles: After the obstacle pile information is collected, backfill and compact the area around the obstacle piles, and lay steel plates to ensure the safety of the rotary drilling rig operation. S5. Obstacle pile coordinate layout: After the ground leveling is completed, the obstacle pile positions are laid out, and the center of the obstacle pile position is marked with a rebar head; S6. Install the casing drive on the rotary drilling rig: Remove the pressure plate on the power head of the rotary drilling rig and install the casing drive; S7. Rotary drilling rig lower casing: The casing driver connects to the initial casing section. The rotary drilling rig torque and the cutter head at the end of the initial casing section cut the soil and press the casing in. After the initial section is completely pressed into the soil, the casing is extended and the middle section of the casing is installed. S8. Rotary drilling rig installation of core drill for pile extraction: Based on the basic information of the pile foundation design in the early building drawings, or the information of the obstacle piles collected during the clearing process, select a core drill of appropriate diameter, twist the obstacle piles in sections and remove them until the pile body is completely removed. The twisted pile body concrete on site should be cleaned up, piled up and transported away in a timely manner. S9. Rotary drilling rig replaced with rock-socketed short auger for pile extraction: The rotary drilling rig is replaced with a rock-socketed short auger to complete the pile body that was not completely cleaned in S8. S10. Remove the full casing and backfill the pile hole: Remove the rotary drilling rig bit and use the rotary drilling rig power unit and casing driver to pull out the long casing in sections. In step S8, there are three types of core drills: one with a diameter 20 cm larger than the obstacle pile, one with the same diameter as the obstacle pile, and one with a diameter 10 cm smaller than the obstacle pile. First, a core drill with a diameter 20 cm larger than the obstacle pile is used to remove the soil and some concrete between the casing and the obstacle pile. Then, a core drill with the same diameter as the obstacle pile is used for the operation. The main purpose is to remove the reinforcing steel bars from the obstacle pile. After a section of reinforcing steel bars is removed, a core drill with a diameter 10 cm smaller is used to tighten the obstacle pile head. The torque of the rotary drilling rig is then used to break the obstacle pile into sections and remove it.

2. The construction method for clearing obstacle piles in complex environments using a rotary drilling rig according to claim 1, characterized in that: In step S1, GPS or a total station is used to mark the locations of the piles to be constructed, or exploratory trenches are dug during the construction of the support structure to identify obstacles.

3. The construction method for clearing obstacle piles in complex environments using a rotary drilling rig according to claim 1, characterized in that: In step S7, the initial sections of the casing are fixed together using casing connecting bolts and casing fixing pins.

4. The construction method for clearing obstacle piles in complex environments using a rotary drilling rig according to claim 1, characterized in that: In step S9, with the obstacle pile fully encased in the casing, the obstacle pile is broken and crushed using a rotary drilling rig with high torque inside the casing. After the rotary drilling rig has drilled to a certain depth, a sand-dredging drill is used to remove the broken concrete fragments and short steel bars until the obstacle pile is completely removed.

5. The construction method for clearing obstacle piles in complex environments using a rotary drilling rig according to claim 1, characterized in that: In step S10, while pulling out the casing, an excavator is used to backfill the pile hole inside the casing to ensure that the backfilled cement soil is dense and of good quality, which facilitates the later pile foundation construction and avoids the collapse of the hole during the pile foundation construction process.

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