Foundation pile foundation hole forming construction method

Abstract

The invention discloses a foundation pile foundation hole-forming construction method. The method comprises the following steps of construction preparation, construction road arrangement, pile casing arrangement and self-flowing type positive circulation system and slag extraction cylinder equipment arrangement. Measuring and setting out: measuring and setting out a pile position center line and a pile diameter according to a construction drawing; the performance state of the drilling machine is checked, and the drilling machine is positioned; embedding a pile casing, setting out through the positioned control pile, and marking the drilling position of the drilling machine at the bottom of the hole. According to the foundation pile foundation hole-forming construction method, through accurate measurement lofting, drilling machine positioning and accurate pile casing burying, it is guaranteed that the center line of the pile position and the hole diameter are accurate, and in the drilling construction process, the working state of a hydraulic system is monitored in real time, and drilling parameters are adjusted in real time; potential safety hazards can be found and treated in time, through combined use of low-hammer close striking and slurry protection walls, hole wall collapse is effectively prevented, shutdown and rework caused by collapse are reduced, and therefore the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hole forming for foundation piles, and particularly relates to a construction method for hole forming of foundation piles. Background Art

[0002] Foundation and basic engineering is one of the leading projects in building construction, and it is also the project part with relatively complex construction technology, great difficulty, long construction period and large investment. As an important load-bearing structure of a building, the quality of hole forming construction of foundation piles is directly related to the stability and safety of the entire building. In recent years, with the rapid development of China's economic construction, urban construction has increased day by day, and the importance of foundation and basic construction has also been increasingly emphasized and concerned by all parties. At present, most large and medium-sized buildings in China adopt pile foundations, and there are generally two ways for engineering piles. One is to use all manual excavation. Although the hole forming quality is good, the mechanization degree is low, the hole forming takes a long time and the efficiency is low. The other way is to use a rotary drilling rig for hole forming. Although the hole forming speed is fast, due to the problems of low efficiency, easy collapse of the hole wall and difficult guarantee of the pile body quality in hole forming by the rotary drilling rig under different geological conditions. Summary of the Invention

[0003] In view of the above deficiencies in the prior art, the present invention provides a construction method for hole forming of foundation piles, and its purpose is to solve the problems of manual excavation, although the hole forming quality is good, but the mechanization degree is low, the hole forming takes a long time and the efficiency is low. The other way is to use a rotary drilling rig for hole forming. Although the hole forming speed is fast, due to the problems of low efficiency, easy collapse of the hole wall and difficult guarantee of the pile body quality in hole forming by the rotary drilling rig under different geological conditions, etc.

[0004] In order to achieve the above invention purpose, the technical solution adopted by the present invention is:

[0005] A construction method for hole forming of foundation piles includes the following steps:

[0006] Step 1: Construction preparation, set the construction road, set the casing, and arrange the self-flowing positive circulation system and the mucking bucket equipment;

[0007] Step 2: Measurement and lofting, according to the construction drawings, measure and mark out the pile position center line and the pile diameter;

[0008] Step 3: Rig positioning, check the performance status of the rig and position the rig;

[0009] Step 4: Bury the casing, loft through the positioning control pile, mark the position of the rig drilling hole at the bottom of the hole; then lift the steel casing into the hole, find the center position of the steel casing, use a cross line at the top of the steel casing, and then move the steel casing to make the center of the steel casing coincide with the center position of the rig drilling hole; at the same time, check with a spirit level to make the steel casing vertical; symmetrically and evenly backfill the muck around the steel casing and tamp it layer by layer;

[0010] Step 5: Drilling. At the beginning, strike with a low hammer at a high frequency and promptly add mud or clay for shaft protection. As the hole depth increases, increase the stroke and hammer height and switch to normal continuous impact drilling.

[0011] Step 6: Hole formation inspection. Regularly inspect the hole during drilling and conduct final hole acceptance after drilling is completed.

[0012] Furthermore, in Step 1, for construction preparation, level the site and remove sundries according to the design requirements. The size of the leveled site is 8m * 10m, which is the size of the position for the rotary drilling rig construction. The elevation difference around the leveled site is not more than 0.2m.

[0013] Furthermore, in Step 2, for surveying and setting out: When setting out the elevation for drilling, promptly review the set-out elevation; use a total station to accurately set out the positions of each pile point, with the error not exceeding 10mm.

[0014] Furthermore, in Step 4, for casing installation: At the hole opening, use a steel casing with a length within 2m and made of steel plate with a thickness of 8 - 10mm. The inner diameter of the steel casing is larger than the drill bit diameter; the embedding depth of the steel casing is 300mm above the ground.

[0015] Furthermore, in Step 4, before installing the steel casing, the deviation of the top surface position of the steel casing is not more than 5cm, and the inclination of the steel casing during installation is not more than 1%;

[0016] Before installing the steel casing, first use a drill bit with a larger diameter to pre-drill to the elevation position at the bottom of the casing, then lift the drill bucket and use the drill bucket to press the steel casing into the predetermined position, and then backfill the surrounding outside the casing with coarse-grained soil and compact it.

[0017] Furthermore, in Step 5, for drilling construction, first erect and level the drill mast of the rotary drilling rig. When drilling, first place the drill bucket on the ground and record the original position of the drill bit of the drilling rig;

[0018] ' During the operation process, the operator monitors the working state of the hydraulic system in real time through the power head pressure, pressurization pressure, and main hoist pressure;

[0019] When starting to drill, use the self-weight of the drill bucket and pressurization as the drilling power. The short strip column shows the current drilling depth of the drill bit, the long strip column dynamically shows the movement position of the drill bit, and the digital display of the hole depth shows the total depth of this hole;

[0020] When the drill bucket is filled with drill cuttings by extrusion, lift it out of the ground surface and use a loader to transport the drill cuttings away;

[0021] After completion, return to the drilling operation position, and at the same time observe and record the geological conditions of the drilling;

[0022] Further, in step six, during the drilling process, when encountering hard boulders or complex geological conditions, the perpendicularity of the hole formation is inspected every 1 - 2 m.

[0023] During the normal drilling construction process, the perpendicularity of the hole formation is inspected every 5 - 8 m.

[0024] If deviation occurs, immediately stop drilling, backfill the concrete, and re - drill.

[0025] Further, in step six, after the hole formation reaches the designed elevation, check the hole depth, hole diameter, hole wall, and perpendicularity.

[0026] The beneficial effects of the present invention are as follows:

[0027] A construction method for hole formation of a foundation pile foundation of the present invention ensures the accuracy of the pile position center line and hole diameter through precise measurement and setting out, positioning of the drilling rig, and precise embedding of the casing, thus greatly improving the accuracy of hole formation and reducing quality problems caused by position deviation. During the drilling construction process, by real - time monitoring the working state of the hydraulic system and adjusting the drilling parameters, potential safety hazards such as geological changes and equipment failures can be detected and handled in a timely manner, thus ensuring the safety of construction personnel. The combined use of low - hammer dense impact and mud wall protection effectively prevents the collapse of the hole wall, reduces the suspension of work and rework caused by collapse, and thus improves the construction efficiency. At the same time, the timely treatment of drill cuttings also keeps the construction site clean and is conducive to the continuous progress of construction. Description of the Drawings

[0028] Figure 1 It is a flow chart of the construction method for hole formation of the foundation pile foundation of the present invention. Detailed Embodiment

[0029] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings.

[0030] As Figure 1 shown, a construction method for hole formation of a foundation pile foundation ensures the high precision and stability of the hole formation of the foundation pile through refined construction steps and strict quality control.

[0031] Construction preparation stage:

[0032] Site leveling and cleaning: First, according to the design requirements, level the construction area to ensure that the site size is the minimum space required for the construction of the rotary drilling rig, that is, 8 m * 10 m.

[0033] Clean the sundries in the site, such as stones, tree roots, etc., to ensure the smooth progress of construction.

[0034] The elevation difference around the leveled site should be controlled within a range not greater than 0.2m to ensure the stability of the drill rig during operation.

[0035] Set up the construction road and equipment: Set up the construction road on the leveled site to facilitate the entry and exit of equipment and the transportation of materials.

[0036] Meanwhile, install and debug the self-flowing positive circulation system and the slag bucket equipment to ensure their normal operation during construction.

[0037] Set up the casing: According to the construction drawings, set up the casing at the predetermined position to protect the hole opening and prevent collapse.

[0038] Measurement and layout stage:

[0039] Elevation layout: Use the total station to layout the elevation of the borehole and review the layout results to ensure that the error does not exceed 10mm.

[0040] Pile position layout: Similarly, use the total station to accurately layout the positions of each pile point to ensure the accurate measurement of the pile position center line and pile diameter.

[0041] Drill rig positioning and casing installation:

[0042] Drill rig positioning: Check the performance status of the drill rig to ensure it is in good working condition. Then, position the drill rig according to the layout results to ensure that the drill center of the drill rig coincides with the pile position center.

[0043] Casing installation: Use a steel casing made of steel plate with a length not exceeding 2m and a thickness of 8 - 10mm, and its inner diameter should be slightly larger than the drill bit diameter.

[0044] At the hole opening, layout through the positioning control piles, lift the steel casing into the hole, and adjust its position to make the center of the steel casing coincide with the drill center of the drill rig.

[0045] Meanwhile, use a spirit level to check the verticality of the steel casing to ensure that its inclination does not exceed 1%.

[0046] Uniformly backfill the soil around the steel casing and compact it in layers to enhance the stability of the casing.

[0047] Borehole construction:

[0048] Low hammer dense impact and mud wall protection: At the beginning of drilling, adopt the method of low hammer dense impact and timely add mud or clay for wall protection to prevent the collapse of the hole wall. As the hole depth increases, gradually increase the stroke and hammer height and transfer to normal continuous impact drilling.

[0049] Real-time monitoring and adjustment: During the drilling process, the operator needs to monitor the working status of the hydraulic system in real time through parameters such as the power head pressure, pressurization pressure, and main winch pressure to ensure the smooth progress of the drilling operation.

[0050] Meanwhile, adjust the drilling parameters according to the geological conditions. When encountering hard boulders or complex geology, it is necessary to increase the frequency of checking the hole verticality.

[0051] Drilling slag treatment: When the drilling bucket is filled with drilling slag by extrusion, promptly lift it out of the ground surface and use a loader to transport the drilling slag away to keep the construction site clean.

[0052] Hole forming inspection and subsequent treatment:

[0053] Hole forming inspection: Regularly inspect the hole during drilling and conduct final hole acceptance after drilling is completed.

[0054] The inspection content includes hole depth, hole diameter, hole wall, verticality, etc., to ensure that all indicators meet the design requirements.

[0055] Deviation treatment: If hole deviation is found during hole forming, immediately stop drilling and take measures such as backfilling concrete to re-drill until the hole verticality meets the requirements.

[0056] Subsequent construction preparation: After the hole forming inspection is qualified, subsequent construction steps such as steel cage installation and concrete pouring can be carried out to complete the construction of the foundation pile foundation.

[0057] A hole forming construction method for a foundation pile foundation of the present invention ensures the accuracy of the pile position center line and hole diameter through precise measurement and lofting, drilling rig positioning, and precise embedding of the casing, thus greatly improving the hole forming accuracy and reducing quality problems caused by position deviation.

[0058] During the drilling construction process, by real-time monitoring the working status of the hydraulic system and adjusting the drilling parameters, potential safety hazards such as geological changes and equipment failures can be detected and handled in a timely manner, thus ensuring the safety of construction personnel.

[0059] The combined use of low hammer dense impact and mud wall protection effectively prevents the collapse of the hole wall, reduces shutdowns and rework caused by collapse, and thus improves the construction efficiency. At the same time, the timely treatment of drilling slag also keeps the construction site clean and is conducive to the continuous progress of construction.

[0060] The strict control during the hole forming inspection stage, including inspections in multiple aspects such as hole depth, hole diameter, hole wall, and verticality, ensures that the hole forming quality meets the design requirements, lays a solid foundation for subsequent construction steps such as steel cage installation and concrete pouring, and thus guarantees the engineering quality of the entire foundation pile foundation.

[0061] Through refined construction management and quality control, rework and material waste caused by quality problems are reduced, thus reducing the construction cost. At the same time, the improvement of construction efficiency further shortens the construction period and reduces the time cost.

[0062] The above are only the preferred embodiments of the present invention patent and are not intended to limit the present invention patent. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention patent shall be included within the protection scope of the present invention patent.

Claims

1. A construction method for forming a hole in a foundation pile foundation, characterized in that, It includes the following steps: Step 1: Construction preparation, set up the construction road, set up the casing, arrange the self-flowing positive circulation system and the slag bucket equipment; Step 2: Survey and layout, according to the construction drawings, measure and mark out the pile center line and the pile diameter; Step 3: Drill rig positioning, check the performance status of the drill rig and position the drill rig; Step 4: Bury the casing, lay out through the positioning control pile, mark the position of the drill hole of the drill rig at the bottom of the hole; then lift the steel casing into the hole, find the center position of the steel casing, use a cross line at the top of the steel casing, and then move the steel casing to make the center of the steel casing coincide with the center position of the drill hole of the drill rig; at the same time, check with a spirit level to make the steel casing vertical; symmetrically and evenly backfill the soil around the steel casing and tamp it layer by layer; Step 5: Drilling, at the beginning, strike with a low hammer densely and add mud or clay for shaft protection in time. As the hole depth increases, increase the stroke and hammer height and switch to normal continuous impact drilling; Step 6: Hole formation inspection, regularly inspect the hole during drilling and conduct final hole acceptance after drilling is completed.

2. The construction method for forming a hole in a foundation pile foundation according to claim 1, characterized in that: In the above Step 1, for construction preparation, level the site and remove sundries according to the design requirements. The size of the leveled site is 8m * 10m, which is the size of the position for the rotary drilling rig construction. The elevation difference around the leveled site is not more than 0.2m.

3. A method for constructing a hole for a foundation pile foundation according to claim 1, characterized in that: In the above Step 2, for survey and layout: when conducting elevation layout for drilling, review the layout elevation in time; accurately layout the positions of each pile point with a total station, so that the error does not exceed 10mm.

4. A construction method for forming a hole in a foundation pile foundation according to claim 1, characterized in that: In the above Step 4, for burying the casing: use a steel casing with a length within 2m at the hole opening, and make the steel casing with a steel plate thickness of 8 - 10mm. The inner diameter of the steel casing is larger than the drill bit diameter; the buried depth of the steel casing is 300mm higher than the ground surface.

5. A method for constructing a hole for a foundation pile foundation according to claim 4, characterized in that: In the above Step 4, before burying the steel casing, the deviation of the top surface position of the steel casing is not more than 5cm, and the inclination of the steel casing during burial is not more than 1%; Before burying the steel casing, first use a drill bit with a larger diameter to pre-drill to the elevation position at the bottom of the casing, then lift out the drill bucket and press the steel casing into the predetermined position with the drill bucket, and then backfill the soil around the outside of the casing with coarse-grained soil and compact it.

6. A construction method for forming a hole in a foundation pile foundation according to claim 1, characterized in that: In the above Step 5, for drilling construction, first erect and adjust the plumb of the drill mast of the rotary drilling rig. When drilling, first place the drill bucket on the ground and record the original position of the drill bit of the drill rig; During the operation process, the operator monitors the working state of the hydraulic system in real time through the power head pressure, the pressurizing pressure, and the main hoist pressure; When starting to drill, use the self-weight of the drill bucket and pressurization as the drilling power. The short strip column shows the current drilling depth of the drill bit, the long strip column dynamically shows the movement position of the drill bit, and the digital display of the hole depth shows the total depth of this hole; When the drill bucket is filled with drill slag by extrusion, lift it out of the ground surface and transport the drill slag away with a loader; After completion, return to the drilling operation position, and at the same time observe and monitor and record the geological conditions of the drilling.

7. A method for forming a hole in a foundation pile foundation according to claim 1, characterized in that: In the above Step 6, during drilling, when encountering hard boulders or complex geological conditions, check the perpendicularity of the hole formation once every 1 - 2m; During the normal drilling construction process, check the perpendicularity of the hole formation once every 5 - 8m; If deviation occurs, immediately stop drilling, backfill concrete and re-drill.

8. A method for forming a hole in a foundation pile foundation according to claim 1, characterized in that: In the above Step 6, after the hole formation reaches the design elevation, check the hole depth, hole diameter, hole wall, and perpendicularity.

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