Pile foundation rotary excavating method

Abstract

The invention discloses a pile foundation rotary excavating method. The method comprises the following steps: placing a rotary drilling rig in a construction site; a rotary drilling rig is used for drilling; descending the steel casing to a certain depth underground; a drilling machine is started in the steel casing, and soil is taken to the bottom of the casing; a slurry protection wall is formed through grouting; according to design requirements, soil taking drilling, slurry supplementing and soil taking hole forming are carried out; the thickness of sediment in the hole is checked regularly; a pre-manufactured reinforcement cage is hung in the hole; the thickness of the sediment in the hole is checked again, and the sediment in the hole is removed; a guide pipe is hung in the hole and used for follow-up concrete pouring; checking the internal condition of the catheter, and removing sundries in the catheter; a hole cleaning cap is installed at the top end of the guide pipe and used for controlling slurry discharge in the concrete pouring process. Hole bottom slurry is discharged through grouting; secondary hole cleaning is carried out before concrete pouring; starting to pour concrete, and pouring layer by layer according to design requirements; and after concrete pouring is completed, the steel casing is slowly pulled out, and a complete pile foundation structure is formed.

Description

Technical Field

[0001] The present application relates to the technical field of construction engineering, and in particular to a pile foundation rotary drilling method. Background Art

[0002] In the field of civil engineering, pile foundation construction is a crucial engineering link, which directly affects the bearing capacity and stability of the project. However, under complex geological conditions, such as soft soil, mud strata or rock layers, traditional pile foundation construction often faces many challenges, including slow hole-making speed, long construction period, difficult quality control, and even may lead to quality problems such as hole collapse and shrinkage, which seriously affect the safety and reliability of the project.

[0003] Technical challenges: Traditional pile foundation construction has many technical difficulties under complex geological conditions, mainly including slow hole-making speed, difficult to ensure construction quality, long construction period and other problems. Among them, the slow hole-making speed leads to the extension of the construction period, increasing the cost and risk of the project; the difficulty in ensuring construction quality may cause quality problems such as hole collapse and shrinkage, seriously affecting the bearing capacity and stability of the project. Summary of the invention

[0004] The present application provides a pile foundation rotary drilling method, comprising:

[0005] Step 1: Place the rotary drilling rig at the construction site;

[0006] Step 2: Use a rotary drilling rig to drill holes and gradually expand the hole diameter;

[0007] Step 3: Slowly lower the steel casing to a certain depth underground and keep it vertical;

[0008] Step 4: Start the drill in the steel casing and take soil to the bottom of the casing;

[0009] Step 5: When the burial depth of the steel casing is limited, grouting is used to form a mud wall;

[0010] Step 6: Carry out soil drilling, grouting and soil drilling according to design requirements;

[0011] Step 7: Regularly check the thickness of the sediment in the hole and remove the sediment in the hole;

[0012] Step 8: After the construction is completed, move the rotary drilling rig away from the construction location;

[0013] Step 9: Hang the prefabricated steel cage in the hole;

[0014] Step 10: Check the thickness of the sediment in the hole again and remove the sediment in the hole;

[0015] Step 11: Hang a conduit in the hole for subsequent concrete pouring;

[0016] Step 12: Check the inside of the catheter to ensure it is unobstructed and remove any debris from the catheter;

[0017] Step 13: Install a hole-cleaning cap on the top of the conduit to control the discharge of mud during concrete pouring;

[0018] Step 14: Discharge the mud at the bottom of the hole by grouting;

[0019] Step 15: Perform secondary hole cleaning before concrete pouring to make the hole clean and release the pressure in the conduit;

[0020] Step 16: Start pouring concrete, layer by layer according to design requirements;

[0021] Step 17: After the concrete pouring is completed, slowly pull out the steel casing to form a complete pile foundation structure.

[0022] Optionally, the rotary drilling rig uses a rotary drill bit to drill holes.

[0023] Optionally, the grouting of the mud wall is carried out using a high-pressure grouting machine.

[0024] Optionally, the pulling-out speed of the steel casing is controlled between 0.1 m / min and 0.3 m / min.

[0025] Optionally, the diameter of the steel casing is 0.8 to 1.2 times the hole diameter.

[0026] Optionally, the diameter of the conduit is 0.6 to 0.8 times the diameter of the aperture.

[0027] Optionally, the diameter of the steel cage is 0.8 to 1.2 times the hole diameter.

[0028] Optionally, the mud comprises cement, clay and fresh water in a ratio of 1:2:20.

[0029] It can be seen from the above technical solutions that this application has the following advantages:

[0030] 1. By using a rotary drilling rig to drill holes and take soil, combined with the advantages of mechanized operations, the construction speed is greatly improved, saving manpower and time costs.

[0031] 2. During the construction process, regularly check the thickness of the sediment in the hole and remove the sediment in the hole to ensure the cleanliness and flatness of the hole wall and the stability and bearing capacity of the pile foundation.

[0032] 3. When the burial depth of the steel casing is limited, grouting is used to form a mud wall, which can flexibly respond to complex geological conditions and ensure the smooth progress of construction.

[0033] 4. During the construction process, each process is interconnected and carried out in an orderly manner, ensuring the continuity and efficiency of the construction and reducing engineering risks.

[0034] 5. By regularly checking the thickness of the sediment in the hole, removing the sediment in the hole, and using pre-made steel cages, the safety of the construction site is guaranteed and the possibility of construction accidents is reduced.

[0035] 6. The use of mechanized construction and flexible response to geological conditions can effectively save manpower, time and material costs, and improve the economic benefits of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The present invention is a schematic flow chart of an embodiment of the pile foundation rotary drilling method provided in the present application. DETAILED DESCRIPTION

[0037] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation orientations of the various components or components.

[0038] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0039] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification so as to facilitate the understanding and reading of those skilled in the art, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0041] The following will be combined with the drawings in this application to clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] See also Figure 1 The present application first provides an embodiment of a pile foundation rotary drilling method, which comprises:

[0043] Step 1: Place the rotary drilling rig at the construction site;

[0044] Transport the rotary drilling rig to the construction site and place it in the predetermined position according to construction requirements to ensure safety and stability.

[0045] Step 2: Use a rotary drilling rig to drill holes and gradually expand the hole diameter;

[0046] Start the rotary drilling rig, use the rotary drill bit to drill a hole in the ground, and start the drilling process.

[0047] During the drilling process, the hole diameter is gradually enlarged to meet the pile foundation diameter required by the design.

[0048] Step 3: Slowly lower the steel casing to a certain depth underground and keep it vertical;

[0049] During the drilling process, the steel casing is slowly lowered to the predetermined depth to ensure that the casing is placed vertically and firmly underground.

[0050] Step 4: Start the drill in the steel casing and take soil to the bottom of the casing;

[0051] After the drilling rig is started, it enters the steel casing and begins to take soil until it reaches the bottom of the casing.

[0052] Step 5: When the burial depth of the steel casing is limited, grouting is used to form a mud wall;

[0053] If the steel casing is limited in depth during its descent, the grouting method is used to form a mud wall on the hole wall to enhance the stability of the hole wall.

[0054] Step 6: Carry out soil drilling, grouting and soil drilling according to design requirements;

[0055] According to the engineering design requirements, continue to drill for soil and perform grouting operations when necessary until the hole depth and diameter required by the design are reached.

[0056] Step 7: Regularly check the thickness of the sediment in the hole and remove the sediment in the hole;

[0057] Regularly check the thickness of the sediment in the hole to ensure that it does not exceed the specified range, remove the sediment in the hole in time and keep the hole wall clean.

[0058] Step 8: After the construction is completed, move the rotary drilling rig away from the construction location;

[0059] After completing the drilling and soil excavation operations, move the rotary drilling rig away from the construction site to facilitate subsequent processes.

[0060] Step 9: Hang the prefabricated steel cage in the hole;

[0061] The prefabricated steel cage is placed into the prepared hole by lifting equipment, ensuring that the verticality and position of the steel cage meet the design requirements.

[0062] Step 10: Check the thickness of the sediment in the hole again and remove the sediment in the hole;

[0063] Recheck the hole where the steel cage has been placed to ensure that the sediment thickness meets the requirements and remove any debris and sediment.

[0064] Step 11: Hang a conduit in the hole for subsequent concrete pouring;

[0065] The conduit is placed into the prepared hole by lifting equipment. The conduit will be used for diversion and mud drainage during the subsequent concrete pouring process.

[0066] Step 12: Check the inside of the catheter to ensure it is unobstructed and remove any debris from it;

[0067] Carry out an internal inspection of the suspended conduit to ensure that it is unobstructed and remove any debris that may affect concrete pouring.

[0068] Step 13: Install a hole-cleaning cap on the top of the conduit to control the discharge of mud during concrete pouring;

[0069] A hole cleaning cap is installed at the top of the conduit to control the discharge of mud during concrete pouring and ensure the quality of concrete pouring.

[0070] Step 14: Discharge the mud at the bottom of the hole by grouting;

[0071] Before concrete pouring, the mud at the bottom of the hole is discharged through grouting to ensure the quality and stability of concrete pouring.

[0072] Step 15: Perform secondary hole cleaning before concrete pouring to make the hole clean and release the pressure in the conduit;

[0073] Before concrete pouring, perform a secondary hole cleaning operation to ensure that the hole is clean and release the pressure in the conduit to prepare for concrete pouring.

[0074] Step 16: Start pouring concrete, layer by layer according to design requirements;

[0075] Start pouring concrete into the hole, layer by layer according to the design requirements to ensure that the concrete is evenly distributed and improve the bearing capacity of the pile foundation.

[0076] Step 17: After the concrete pouring is completed, slowly pull out the steel casing to form a complete pile foundation structure.

[0077] When the concrete pouring is completed, the steel casing is slowly pulled out to complete the pile foundation structure and complete the entire pile foundation construction process.

[0078] The pile foundation rotary drilling method provided in this application is a comprehensive and efficient construction method, which is suitable for pile foundation projects under various geological conditions. Its main features include:

[0079] By using professional equipment such as rotary drilling rigs, mechanized operations of pile foundation construction have been achieved, improving construction efficiency and quality.

[0080] When encountering complex geological conditions or construction difficulties, we can flexibly adopt methods such as grouting to form mud wall protection to ensure the smooth progress of construction.

[0081] Regularly check the thickness of the sediment in the hole and remove the sediment in the hole to keep the hole wall clean and ensure the stability and bearing capacity of the pile foundation.

[0082] Paying attention to safety during the construction process and conducting regular inspections and cleaning of the construction site reduces construction risks and ensures the safety of construction personnel and equipment.

[0083] Through mechanized construction and process optimization, manpower, time and material costs are saved and the economic benefits of the project are improved.

[0084] In a specific embodiment, the rotary drilling rig uses a rotary drill bit to drill holes.

[0085] A rotary drilling rig is placed at the construction site, and the drilling rig uses a rotary drilling bit to drill holes. The drilling rig is started to drill holes in the ground, and the hole diameter is gradually enlarged until it meets the design requirements.

[0086] In a specific embodiment, the grouting of the mud wall is performed using a high-pressure grouting machine.

[0087] When the burial depth of the steel casing is limited, a high-pressure grouting machine is used to inject mud wall protection. The high-pressure grouting machine is connected to the hole mouth, and the mud (mixed by cement, clay and fresh water in a ratio of 1:2:20) is injected into the hole wall around the steel casing through a high-pressure pump to form a mud wall protection.

[0088] In a specific embodiment, the pulling-out speed of the steel casing is controlled between 0.1 m / min and 0.3 m / min.

[0089] During the pile foundation construction process, the steel casing withdrawal speed is controlled between 0.1 m / min and 0.3 m / min to ensure that the withdrawal process is stable and does not affect the stability of the pile foundation structure.

[0090] In a specific embodiment, the diameter of the steel casing is 0.8 to 1.2 times the diameter of the hole.

[0091] The diameter of the steel casing is set to 0.8 to 1.2 times the hole diameter and is selected according to specific design requirements to ensure the stability and bearing capacity of the pile foundation structure.

[0092] In a specific embodiment, the diameter of the conduit is 0.6 to 0.8 times the diameter of the hole.

[0093] The diameter of the conduit is set to 0.6 to 0.8 times the aperture for subsequent concrete pouring, and the selection of the conduit diameter takes into account the smoothness of concrete pouring and the efficiency of mud discharge.

[0094] In a specific embodiment, the diameter of the steel cage is 0.8 to 1.2 times the hole diameter.

[0095] The diameter of the steel cage is set to 0.8 to 1.2 times the hole diameter to enhance the bearing capacity and tensile properties of the pile foundation and ensure the stability of the pile foundation.

[0096] In a specific embodiment, the composition of the mud includes cement, clay and fresh water in a ratio of 1:2:20.

[0097] The composition of mud includes cement, clay and fresh water, which are mixed in the ratio of 1:2:20. The ratio of cement and clay can be adjusted to suit different geological conditions, and fresh water is used to dilute and adjust the fluidity of the mud.

[0098] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pile foundation rotary drilling method, characterized in that: include: Step 1: Place the rotary drilling rig at the construction site; Step 2: Use a rotary drilling rig to drill holes and gradually expand the hole diameter; Step 3: Slowly lower the steel casing to a certain depth underground and keep it vertical; Step 4: Start the drill in the steel casing and take soil to the bottom of the casing; Step 5: When the burial depth of the steel casing is limited, grouting is used to form a mud wall; Step 6: Carry out soil drilling, grouting and soil drilling according to design requirements; Step 7: Regularly check the thickness of the sediment in the hole and remove the sediment in the hole; Step 8: After the construction is completed, move the rotary drilling rig away from the construction location; Step 9: Hang the prefabricated steel cage in the hole; Step 10: Check the thickness of the sediment in the hole again and remove the sediment in the hole; Step 11: Hang a conduit in the hole for subsequent concrete pouring; Step 12: Check the inside of the catheter to ensure it is unobstructed and remove any debris from the catheter; Step 13: Install a hole-cleaning cap on the top of the conduit to control the discharge of mud during concrete pouring; Step 14: Discharge the mud at the bottom of the hole by grouting; Step 15: Perform secondary hole cleaning before concrete pouring to make the hole clean and release the pressure in the conduit; Step 16: Start pouring concrete, layer by layer according to design requirements; Step 17: After the concrete pouring is completed, slowly pull out the steel casing to form a complete pile foundation structure.

2. The pile foundation rotary drilling method according to claim 1, characterized in that: The rotary drilling rig uses a rotary drill bit to open holes.

3. The pile foundation rotary drilling method according to claim 1 or 2, characterized in that: The grouting of mud wall is carried out by high pressure grouting machine.

4. The pile foundation rotary drilling method according to claim 1, characterized in that: The pulling-out speed of the steel casing is controlled between 0.1 m / min and 0.3 m / min.

5. The pile foundation rotary drilling method according to claim 1, characterized in that: The diameter of the steel casing is 0.8 to 1.2 times the hole diameter.

6. The pile foundation rotary drilling method according to claim 1, characterized in that: The diameter of the conduit is 0.6 to 0.8 times the diameter of the hole.

7. The pile foundation rotary drilling method according to claim 1, characterized in that: The diameter of the steel cage is 0.8 to 1.2 times the hole diameter.

8. The pile foundation rotary drilling method according to claim 1, characterized in that: The mud consists of cement, clay and fresh water in a ratio of 1:2:20.

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