Mud blocking and soil retaining construction method for static drilling root planting pile

Abstract

The invention discloses a slurry blocking and soil retaining construction method for a static drilling root planting pile. The slurry blocking and soil retaining construction method comprises the following steps that a slurry blocking and soil retaining component is prefabricated; a pile bottom mud blocking baffle is installed, and after drilling operation of the static drilling root planting pile is completed and accepted and accepted, pile planting equipment is started to press the first bamboo joint pile; when the pile top of the first bamboo joint pile is pressed to the clamping position of a construction clamp, pile pressing is suspended, and the round iron plate prefabricated in the step S1 serves as a pile bottom mud blocking baffle and is horizontally placed on the upper surface of a pile top flange plate; then the baffle and the flange plate are fixed in a full-length welding mode through manual arc welding, and a pressure relief hole needs to be formed in the center of the baffle in the welding process and used for releasing the pressure of mud in the pile hole; pile splicing operation; a pile top mud blocking cover plate is installed; and the pile top mud blocking cover plate is dismantled. Lower mud and upper soil can be effectively prevented from entering the pipe pile, construction is convenient, and meanwhile the effect is good.

Description

Technical Field

[0001] This invention relates to the field of pile foundation construction technology, and more specifically, to a method for constructing statically drilled root-planted piles with mud-blocking slurry retaining walls. Background Technology

[0002] Static drilling and root-planting of bamboo-joint piles results in minimal soil displacement and generates less mud. Compared to cast-in-place piles, it offers advantages such as faster construction speed and lower cost, leading to its increasingly widespread application. This technology is particularly suitable for soft soil foundations, and the low mud discharge aligns with green construction and low-carbon environmental protection requirements. However, the static drilling and root-planting technology is not yet perfect, and some issues may arise during construction. The process requires grouting before pile installation. During installation, mud enters the cavities of the bamboo-joint pile and the pipe pile, and soil from the pile top also enters the cavities. The top of the pipe pile typically requires core grouting; without this during pile driving, significant effort will be needed to excavate the hole after excavation. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a static drilling and root-planting pile construction method for preventing mud slurry from entering the pipe pile, which can effectively prevent the lower mud slurry and upper soil from entering the pipe pile, and is convenient to construct and has good results.

[0004] The present invention adopts the following technical solution:

[0005] A method for constructing statically drilled root-planted piles with mud-blocking retaining walls includes the following steps:

[0006] S1. Precast mud-blocking retaining structure;

[0007] S2. Installation of mud baffle at the bottom of the pile

[0008] After the drilling operation of the static drilling pile is completed and accepted, the pile driving equipment is started to carry out the first section of bamboo joint pile driving operation; when the top of the first section of bamboo joint pile is pressed to the clamping position of the construction clamp, the pile driving is paused, and a circular iron plate prefabricated in step S1 is used as a mud slurry baffle at the bottom of the pile and placed horizontally on the upper surface of the top flange of the pile; then the baffle is fully welded to the flange by manual electric arc welding. During the welding process, a pressure relief hole needs to be opened at the center of the baffle to release the pressure of the mud slurry in the pile hole;

[0009] S3, pile splicing operation;

[0010] S4. Installation of mudguard cover plate on pile top;

[0011] S5. Removal of the mud-blocking cover plate at the top of the pile.

[0012] Furthermore, step S1 specifically involves the following steps:

[0013] Prepare two round iron plates for each set of statically drilled and driven piles to be constructed; the diameter of the iron plates must meet two core conditions: first, it must not be larger than the diameter of the pile flange of the statically drilled and driven pile, and second, it must be larger than the diameter of the cavity in the middle of the pile body.

[0014] Furthermore, the specific steps of step S3 are as follows:

[0015] After the mud baffle at the bottom of the pile is welded, the second pile section is hoisted and the bottom flange of the second pile section is aligned with the top flange of the first bamboo-joint pile section. The flanges of the two pile sections are fully welded together using carbon dioxide shielded welding. After welding, the pile is allowed to cool for 3 minutes before starting the pile driving equipment to continue the pile driving operation. If the designed length of the pile body requires the connection of multiple intermediate prestressed pipe piles, the "hoisting-alignment-welding-cooling-pile driving" process is repeated until the pile top elevation is close to the design level.

[0016] Furthermore, the specific steps of step S4 are as follows:

[0017] When the top of the last pile reaches the position of the construction clamp, the pile driving is paused. Another prefabricated circular iron plate is placed on the top flange of the last pile as a mud-blocking cover plate to cover the cavity. The top cover plate is connected to the flange by spot welding.

[0018] Furthermore, the specific steps of step S5 are as follows:

[0019] After the entire static drilling and pile driving construction is completed, and the subsequent earthwork excavation work has reached the design elevation of the pile top, a pry bar is inserted into the gap between the cover plate and the flange, or the edge of the cover plate is gently tapped with a hammer to break the spot weld connection and remove the cover plate; after removal, the residual welding slag on the surface of the flange is cleaned.

[0020] Furthermore, the pressure relief hole has a diameter of 10mm. The pressure relief hole can be opened simultaneously when the circular iron plate is prefabricated in the factory, or it can be opened on the construction site by welding.

[0021] Beneficial effects

[0022] The mud-blocking and soil-retaining effect is significant: through the double protection of "full welded baffle plate at the bottom of the pile + welded cover plate at the top of the pile", it can prevent mud from seeping into the bottom of the pile and soil from falling into the cavity of the pipe pile, completely avoiding the later "hole cleaning" process, saving cleaning time and reducing labor costs.

[0023] Construction is simple and efficient: the iron plates used are only 1mm thick and lightweight, making them easy to handle and install; the welding operations (full welding, spot welding, and CO2 shielded welding) are all standard on-site processes, and workers can master them without additional training; the cooling time is only 3 minutes, which has minimal impact on the overall construction progress.

[0024] Low material cost and strong applicability: The core component is a common round iron plate, which has low market procurement cost. The diameter of the iron plate can be flexibly adjusted according to the flange and cavity size of different pile types, making it suitable for various static drilling and rooting piles with a wide range of applications.

[0025] High safety and environmental protection: The design of the pressure relief hole can effectively release the mud pressure and avoid construction accidents caused by the baffle being broken; the entire construction process does not increase the amount of mud discharge and does not generate construction waste, which meets the industry requirements of green construction and low carbon environmental protection, and is especially suitable for construction in ecologically sensitive areas with soft soil foundations. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an embodiment of the present invention;

[0027] Figure 2 This is a schematic plan view of the bottom mud-blocking baffle according to an embodiment of the present invention;

[0028] Figure 3 This is a plan view of the top mudguard cover plate according to an embodiment of the present invention. Detailed Implementation

[0029] 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.

[0030] As shown in the figure, this invention discloses a method for constructing a statically drilled, root-planted pile with mud-blocking retaining wall, comprising the following steps:

[0031] S1. Precast mud-blocking retaining structure;

[0032] S2, Installation of pile bottom mud slurry baffle 2

[0033] After the drilling operation of the static root planting pile is completed and accepted, the pile planting equipment is started to carry out the pile driving operation of the first bamboo joint pile 1; when the top of the first bamboo joint pile 1 is pressed to the clamping position of the construction clamp, the pile driving is paused. The top of the pile here has a flange.

[0034] The prefabricated circular iron plate in step S1 is used as the pile bottom mud-blocking baffle 2. It is placed horizontally on the upper surface of the pile top flange, ensuring that the baffle is flush with (or slightly smaller than) the flange and completely covers the middle cavity of the pile. Then, the baffle and the flange are fully welded and fixed by manual arc welding. During the welding process, a pressure relief hole 6 with a diameter of about 10mm needs to be opened in the center of the baffle. The baffle mentioned above is the pile bottom mud-blocking baffle 2. If the hole diameter is too small, it will be easy to be blocked. If it is too large, it will lose the mud-blocking effect.

[0035] Pressure relief holes are used to release the pressure of mud in the pile hole and prevent the mud pressure from being too high and breaking through the baffle. Pressure relief holes can be punched and formed simultaneously when the iron plate is prefabricated in the factory, or they can be opened on the construction site by welding holes by electric welding. The operation is simple.

[0036] S3, pile splicing operation;

[0037] S4, Installation of pile top mudguard cover 5;

[0038] S5. Removal of the mud-blocking cover plate at the top of the pile.

[0039] In one embodiment of the present invention, step S1 specifically includes the following steps:

[0040] Prepare two round iron plates for each set of statically drilled and driven piles to be constructed. The thickness of the iron plates should be uniformly 1mm. If the iron plate is too thick, it will increase the welding difficulty and material cost. If the iron plate is too thin, it will be easily broken through by the mud pressure.

[0041] The diameter of the iron plate must meet two core conditions: first, it must not be larger than the diameter of the pile flange of the statically drilled pile to avoid affecting the weld quality of the subsequent pile connection; second, it must be larger than the diameter of the cavity in the middle of the pile to ensure complete coverage of the cavity and prevent mud / soil from entering.

[0042] In actual construction, the diameter of the iron plate is 2-5mm smaller than the diameter of the pile flange and 3-8mm larger than the diameter of the cavity in the middle of the pile. It can be flexibly adjusted according to the actual pile type and specifications (e.g., when the flange diameter is 500mm and the cavity diameter is 300mm, the diameter of the iron plate is 480-495mm).

[0043] The specific steps of step S3 are as follows:

[0044] After the mud baffle at the bottom of the pile is welded, the second pile section is hoisted. The second pile section is usually an intermediate prestressed pipe pile 3. The bottom flange of the second pile section is precisely aligned with the top flange of the first bamboo-joint pile section (if the deviation does not exceed 2mm) to ensure that the pile axis coincides. The flanges of the two pile sections are fully welded together using carbon dioxide shielded welding. This welding method has the advantages of high weld strength, beautiful shape, and no spatter, which can ensure the stability of the pile connection. After welding, let it stand and cool for 3 minutes. Too short a cooling time may cause the weld to crack, while too long a cooling time will affect the construction efficiency. After the weld temperature drops to a certain percentage of the ambient temperature, such as below 80%, the pile driving equipment is started to continue the pile driving operation. If the designed length of the pile requires the connection of multiple intermediate prestressed pipe piles 3, the "hoisting-alignment-welding-cooling-pile driving" process in this step is repeated until it approaches the designed pile top elevation.

[0045] The specific steps of step S4 are as follows:

[0046] When the top of the last pile section (usually the top prestressed pipe pile 4) is pressed to the position of the construction clamp, the pile pressing is paused. Another round iron plate prefabricated in step S1 is placed on the top flange of the last pile section as the pile top mud retainer 5, covering the cavity. Unlike the "full welding fixation" of the pile bottom baffle, the pile top cover is connected to the flange by spot welding (3-4 spot welding points, evenly distributed on the edge of the cover). The spot welding strength is based on the standard that "it can withstand the external force before earthwork excavation (such as rainwater erosion, slight impact) and is easy to remove later" to avoid damaging the flange when removing it later.

[0047] The specific steps of step S5 are as follows:

[0048] After the entire static drilling and pile driving construction is completed (including the driving and splicing of all piles), and the subsequent earthwork excavation work has reached the design elevation of the pile top, a pry bar is inserted into the gap between the cover plate and the flange, or the edge of the cover plate is gently tapped with a hammer to break the spot weld connection, and the cover plate can be easily removed. After removal, the residual welding slag on the surface of the flange needs to be cleaned (e.g., by grinding with an angle grinder) to ensure that the concrete for the subsequent pile top filling work is tightly bonded to the flange, thereby improving the overall bearing capacity of the pile.

[0049] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A method for constructing statically drilled root-planted piles with mud-blocking retaining walls, characterized in that: Includes the following steps: S1. Precast mud-blocking retaining structure; S2. Installation of mud baffle at the bottom of the pile After the drilling operation of the static drilling pile is completed and accepted, the pile driving equipment is started to carry out the first section of bamboo joint pile driving operation; when the top of the first section of bamboo joint pile is pressed to the clamping position of the construction clamp, the pile driving is paused, and a circular iron plate prefabricated in step S1 is used as a mud slurry baffle at the bottom of the pile and placed horizontally on the upper surface of the top flange of the pile; then the baffle is fully welded to the flange by manual electric arc welding. During the welding process, a pressure relief hole needs to be opened at the center of the baffle to release the pressure of the mud slurry in the pile hole; S3, pile splicing operation; S4. Installation of mudguard cover plate on pile top; S5. Removal of the mud-blocking cover plate at the top of the pile.

2. The method for constructing a static drilling and root-planting pile with mud-blocking retaining wall according to claim 1, characterized in that: The specific steps of step S1 are as follows: Prepare two round iron plates for each set of statically drilled and driven piles to be constructed; the diameter of the iron plates must meet two core conditions: first, it must not be larger than the diameter of the pile flange of the statically drilled and driven pile, and second, it must be larger than the diameter of the cavity in the middle of the pile body.

3. The method for constructing a static drilling and root-planting pile with mud-blocking retaining wall according to claim 2, characterized in that: The specific steps of step S3 are as follows: After the mud baffle at the bottom of the pile is welded, the second pile section is hoisted and the bottom flange of the second pile section is aligned with the top flange of the first bamboo-joint pile section. The flanges of the two pile sections are fully welded together using carbon dioxide shielded welding. After welding, the pile is allowed to cool for 3 minutes before starting the pile driving equipment to continue the pile driving operation. If the designed length of the pile body requires the connection of multiple intermediate prestressed pipe piles, the "hoisting-alignment-welding-cooling-pile driving" process is repeated until the pile top elevation is close to the design level.

4. The method for constructing a static drilling and root-planting pile with mud-blocking retaining wall according to claim 1, characterized in that: The specific steps of step S4 are as follows: When the top of the last pile reaches the position of the construction clamp, the pile driving is paused. Another prefabricated circular iron plate is placed on the top flange of the last pile as a mud-blocking cover plate to cover the cavity. The top cover plate is connected to the flange by spot welding.

5. The method for constructing a static drilling and root-planting pile with mud-blocking retaining wall according to claim 1, characterized in that: The specific steps of step S5 are as follows: After the entire static drilling and pile driving construction is completed, and the subsequent earthwork excavation work has reached the design elevation of the pile top, a pry bar is inserted into the gap between the cover plate and the flange, or the edge of the cover plate is gently tapped with a hammer to break the spot weld connection and remove the cover plate; after removal, the residual welding slag on the surface of the flange is cleaned.

6. The method for constructing a static drilling and root-planting pile with mud-blocking retaining wall according to claim 1, characterized in that: The pressure relief hole has a diameter of 10mm. The pressure relief hole can be opened simultaneously when the circular iron plate is prefabricated in the factory, or it can be opened on the construction site by welding.

7. The method for constructing a static drilling and root-planting pile with mud-blocking retaining wall according to claim 1, characterized in that: The thickness of the iron plate is 1mm.

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