Full-rotation all-casing drilling machine and pile pulling construction method thereof
By setting up a grouting pipe in a full-rotary full-tube drilling rig and injecting double liquid slurry during the pile pulling process, the problem of pressure-bearing water in the foundation pit bottom plate cleaning and pile pulling operation is solved, and the grouting bottom seal is achieved, which inhibits the sudden surge of pressure-bearing water, and improves construction safety and efficiency.
Patent Information
- Application Number
- CN202510300204.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2025-06-27
Smart Images
Figure CN120211622A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of building construction, and particularly relates to a full-rotation full-casing drilling rig and a pile extraction construction method thereof. Background Art
[0002] With the development of construction projects, many buildings with basements originally need to be demolished and rebuilt. Inevitably, there will be an overlap between the newly built engineering piles or retaining piles and the existing engineering piles. To effectively solve this problem, it is necessary to extract the existing engineering piles that are affected and cannot be avoided. As some projects involve large areas and deep depths of existing basements, the effective pile lengths of the engineering piles are relatively long. When it is impossible to ensure whether the existing basement top slab can bear the mechanical equipment load, it is possible to consider demolishing the existing structural floor slab and directly descending to the foundation pit bottom slab for obstacle clearance and pile extraction operations. However, when extracting piles on the bottom slab, the problem of confined water cannot be effectively solved. Summary of the Invention
[0003] The purpose of the present invention is to provide a full-rotation full-casing drilling rig and a pile extraction construction method thereof to solve the problem of confined water existing in the obstacle clearance and pile extraction operations on the foundation pit bottom slab.
[0004] To solve the above technical problems, the present invention provides a full-rotation full-casing drilling rig, which includes: a steel casing, and a plurality of grouting pipes arranged inside the steel casing and extending along the axial direction of the steel casing.
[0005] Optionally, in the full-rotation full-casing drilling rig, each grouting pipe is a steel grouting pipe and is fixedly welded to the inner wall of the steel casing.
[0006] Optionally, in the full-rotation full-casing drilling rig, it further includes: a plurality of one-way valves, and one one-way valve is arranged at the end of each grouting pipe.
[0007] The present invention also provides a pile extraction construction method for a full-rotation full-casing drilling rig, which includes the following steps:
[0008] Lower the full-rotation full-casing drilling rig to the existing basement bottom slab surface for positioning, adjust the verticality of the fuselage, and make the center of the hoop system of the fuselage coincide with the center of the old pile in the vertical direction;
[0009] Perform rotary sectional pile extraction based on the full-rotation full-casing drilling rig. Among them, only during the process of extracting the last section of the pile body, grouting treatment is simultaneously performed based on the grouting pipes.
[0010] Optionally, in the pile extraction construction method of the full-rotation full-casing drilling rig, the step of simultaneously performing grouting treatment based on the grouting pipes during the process of extracting the last section of the pile body includes the following steps:
[0011] During the process of extracting the last section of the pile body, while lifting the steel casing of the full-rotation full-casing drilling rig, a double-fluid slurry is injected based on the grouting pipe of the full-rotation full-casing drilling rig.
[0012] Optionally, in the pile extraction construction method of the full-rotation full-casing drilling rig, the process of grouting treatment based on the grouting pipe during the process of extracting the last section of the pile body further includes the following steps:
[0013] Always keep the bottom of the steel casing 1 m below the grouting material until the last section of the pile body is extracted.
[0014] Optionally, in the pile extraction construction method of the full-rotation full-casing drilling rig, the process of grouting treatment based on the grouting pipe includes the following steps:
[0015] During grouting, control the slurry flow rate between 32 L / min and 47 L / min, and control the grouting pressure within 0.4 Mpa to 1.0 Mpa;
[0016] Inject the double-fluid slurry as the bottom backfill material. When the preset conditions are met, stop injecting the double-fluid slurry and use cement soil for backfill instead.
[0017] Optionally, in the pile extraction construction method of the full-rotation full-casing drilling rig, inject the double-fluid slurry as the bottom backfill material until the grouting pressure reaches 2 Mpa and holds for 3 min, then stop injecting the double-fluid slurry and use cement soil for backfill instead.
[0018] Optionally, in the pile extraction construction method of the full-rotation full-casing drilling rig, inject the double-fluid slurry as the bottom backfill material until there is no obvious water level rise in the pile hole, then stop injecting the double-fluid slurry and use cement soil for backfill instead.
[0019] Optionally, in the pile extraction construction method of the full-rotation full-casing drilling rig, inject the double-fluid slurry as the bottom backfill material until the grouting height reaches the elevation of the original basement foundation bottom surface, then stop injecting the double-fluid slurry and use cement soil for backfill instead.
[0020] In the full-rotation full-casing drilling rig and its pile extraction construction method provided by the present invention, the full-rotation full-casing drilling rig includes: a steel casing and a plurality of grouting pipes arranged inside the steel casing and extending along the axial direction of the steel casing. Based on the structural design of the full-rotation full-casing drilling rig, grouting pipes are arranged inside the steel casing, so as to support the pile extraction and obstacle removal construction of the full-rotation full-casing drilling rig on the floor slab. During the process of extracting the last section of the pile body, while lifting the steel casing of the full-rotation full-casing drilling rig, a double-fluid slurry is injected based on the grouting pipe of the full-rotation full-casing drilling rig to achieve grouting and sealing the bottom to inhibit confined water. Description of the Drawings
[0021] The above and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, in which, in the exemplary embodiments of the present disclosure, the same reference numerals generally represent the same components.
[0022] Figure 1 is a schematic diagram of the working principle of a full-rotation full-casing drilling rig in an embodiment of the present invention;
[0023] Figure 2 is Figure 1 a plan view of
[0024] Figure 3 is a flowchart of the pile extraction construction method of a full-rotation full-casing drilling rig in an embodiment of the present invention.
[0025] In the figure:
[0026] 1 - steel casing; 2 - grouting pipe. Detailed implementation manners
[0027] The following further elaborates on the full-rotation full-casing drilling rig and its pile extraction construction method proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will be clearer according to the following description and the claims. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the objectives of the embodiments of the present invention.
[0028] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.
[0029] In the description of the invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the invention.
[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the invention, "a plurality" means two or more unless otherwise specifically defined.
[0031] In an invention, unless otherwise clearly specified or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific circumstances.
[0032] Please refer to Figure 1 and Figure 2 , the full-rotation full-casing drilling rig includes: a steel casing 1 and a plurality of grouting pipes 2 arranged inside the steel casing 1 and extending along the axial direction of the steel casing 1.
[0033] Here, on the basis of maintaining the original structure of the full-rotation full-casing drilling rig (CD machine), a grouting pipe is arranged inside the steel casing and extends along the axial direction of the steel casing, so as to support the full-rotation full-casing drilling rig to carry out pile pulling and obstacle clearing construction on the floor slab. During the process of pulling out the last section of the pile body, while lifting the steel casing of the full-rotation full-casing drilling rig, a double-fluid slurry is injected based on the grouting pipe of the full-rotation full-casing drilling rig at the same time, so as to realize grouting and sealing the bottom to inhibit the confined water and prevent the sudden gushing.
[0034] Preferably, each grouting pipe 2 is a steel grouting pipe, fixedly welded to the inner wall of the steel casing 1. Here, a plurality of steel grouting pipes are welded to the inner wall of the steel casing at a predetermined interval, and their ends are flush with the ends of the steel casing.
[0035] In order to prevent soil (slurry backflow) from entering the grouting pipe when the steel casing is pressed into the soil, preferably, the full-rotation full-casing drilling rig further includes: a plurality of one-way valves, and a one-way valve is arranged at the end of each grouting pipe. Here, the one-way valve is arranged at the end of the grouting pipe.
[0036] Correspondingly, this embodiment also provides a pile pulling construction method for a full-rotation full-casing drilling rig. The following refers to Figures 1 to 3 to describe in detail the pile pulling construction method of the full-rotation full-casing drilling rig of this embodiment.
[0037] First, perform step S1, lower the full-rotation full-casing drilling rig to the existing basement floor slab surface for positioning, adjust the verticality of the fuselage, and make the center of the hoop system of the fuselage coincide with the center of the old pile in the vertical direction;
[0038] Specifically, first rotate and sink the steel casing of the full-rotation full-casing drilling rig to a predetermined depth (within 7 meters). Considering factors such as the large uplift force of the entire pile and the relatively deep pile length, the entire pile extraction process adopts the method of segmental cutting and segmental lifting. The full-rotation casing machine mainly drives the steel casing to rotate by surrounding it, and drives the old pile to rotate eccentrically through a steel wedge to cut the original pile segment by segment. Each section of about 8-10 meters of the pile body is cut off. After that, the grab is used to remove the muck in the casing and expose the pile head again. Then repeat the above steps to cut and extract the pile.
[0039] Next, execute step S2, and perform rotary sectional pile extraction based on the full-rotation full-casing drilling rig. Among them, only during the process of extracting the last section of the pile body, grouting treatment is carried out based on the grouting pipe at the same time.
[0040] First, connect and install the grouting equipment to the grouting pipe of the full-rotation full-casing drilling rig. After the steel casing is inserted into the soil, when performing the last rotary pile extraction of the obstacle pile, the confined water in the pile hole is in a static state. At this time, turn on the grouting equipment and grout while lifting the steel casing to achieve the purpose of sealing the bottom.
[0041] Specifically, during the execution of step S2, the grouting treatment based on the grouting pipe during the process of extracting the last section of the pile body includes the following steps:
[0042] During the process of extracting the last section of the pile body, while lifting the steel casing of the full-rotation full-casing drilling rig, inject a double-fluid slurry based on the grouting pipe of the full-rotation full-casing drilling rig at the same time to perform bottom backfilling and seal the confined water;
[0043] Always keep the bottom of the steel casing 1m below the grouting material until the last section of the pile body is extracted. When encountering a confined water layer, use the steel casing to pre-penetrate this geological layer to cut off the confined water.
[0044] Furthermore, the process of grouting treatment based on the grouting pipe includes the following steps:
[0045] During grouting, control the slurry flow rate between 32L / min and 47L / min, and control the grouting pressure within 0.4Mpa to 1.0Mpa;
[0046] Inject the double-fluid slurry as the bottom backfilling material. When the preset conditions are met, stop injecting the double-fluid slurry and use cement soil for backfilling (i.e., upper backfilling).
[0047] Among them, the preset conditions here are: the grouting pressure reaches 2Mpa and holds for 3 minutes, there is no obvious water level rise in the pile hole, or the grouting height is the elevation of the original basement foundation floor surface.
[0048] It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, some steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.
[0049] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0050] In summary, in the full-rotation full-casing drilling rig and its pile-pulling construction method provided by the present invention, the full-rotation full-casing drilling rig includes: a steel casing, and a plurality of grouting pipes arranged inside the steel casing and extending along the axial direction of the steel casing. Based on the structural design of the full-rotation full-casing drilling rig, grouting pipes are arranged inside the steel casing, so as to support the pile-pulling and obstacle-removing construction of the full-rotation full-casing drilling rig on the floor. During the process of pulling out the last section of the pile body, while lifting the steel casing of the full-rotation full-casing drilling rig, double-fluid slurry is injected based on the grouting pipes of the full-rotation full-casing drilling rig at the same time, so as to realize grouting and sealing the bottom to inhibit confined water.
[0051] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the field of the present invention according to the above disclosure are within the protection scope of the claims.
Claims
1. A full-rotation full-casing drilling rig, characterized in that: include: A steel casing and a plurality of grouting pipes arranged inside the steel casing and extending axially along the steel casing.
2. The full-rotation full-casing drilling rig according to claim 1, characterized in that: Each grouting pipe is a steel grouting pipe, which is fixedly welded to the inner wall of the steel casing.
3. The full-rotation full-casing drilling rig according to claim 1, characterized in that: Also includes: A plurality of one-way valves are provided at the end of each grouting pipe.
4. A pile extraction construction method of a full-rotation full-casing drilling rig as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: Lower the full-rotation and full-casing drilling rig to the existing basement floor, adjust the verticality of the machine body, and make the center of the machine body's clamp system and the center of the old pile keep the vertical line in line; The rotary segmented pile extraction is carried out based on the full-rotation full-casing drilling rig, wherein only during the process of extracting the last segment of the pile, grouting treatment is carried out based on the grouting pipe.
5. The pile extraction construction method of the full-rotation full-casing drilling rig according to claim 4 is characterized in that: In the process of removing the last section of the pile, the grouting treatment based on the grouting pipe includes the following steps: During the process of removing the last section of the pile, while the steel casing of the full-rotation full-casing drilling rig is lifted, double-liquid slurry is injected through the grouting pipe of the full-rotation full-casing drilling rig.
6. The pile extraction construction method of the full-rotation full-casing drilling rig according to claim 5, characterized in that: In the process of removing the last section of the pile, the grouting treatment based on the grouting pipe also includes the following steps: Always keep the bottom of the steel casing 1m below the grouting material until the last section of the pile is pulled out.
7. The pile extraction construction method of the full-rotation full-casing drilling rig according to claim 4, characterized in that: The process of grouting treatment based on the grouting pipe comprises the following steps: During grouting, the slurry flow rate was controlled between 32L / min and 47L / min, and the grouting pressure was controlled between 0.4Mpa and 1.0Mpa; Inject double-liquid slurry as the bottom backfill material until the preset conditions are met, then stop injecting the double-liquid slurry and use cement soil for backfilling instead.
8. The pile extraction construction method of the full-rotation full-casing drilling rig according to claim 7, characterized in that: Inject double-liquid slurry as the bottom backfill material until the grouting pressure reaches 2Mpa and holds the load for 3 minutes, then stop injecting double-liquid slurry and use cement soil for backfilling.
9. The pile extraction construction method of the full-rotation full-casing drilling rig according to claim 7, characterized in that: Inject double-liquid slurry as the bottom backfill material until there is no obvious water level rise in the pile hole. Then stop injecting double-liquid slurry and use cement soil for backfilling instead.
10. The pile extraction construction method of the full-rotation full-casing drilling rig according to claim 7, characterized in that: Inject double-liquid slurry as the bottom backfill material until the grouting height reaches the original basement foundation bottom plate elevation, then stop injecting double-liquid slurry and use cement soil for backfilling.