Pile casing structure capable of improving rotary excavating efficiency

Abstract

The utility model relates to the technical field of pile casings, and discloses a pile casing structure capable of improving rotary excavating efficiency, which is characterized by comprising an inner pile casing and an outer pile casing, the outer pile casing is sleeved on the periphery of the inner pile casing, an annular area is formed between the outer pile casing and the inner pile casing at intervals, and a top opening is formed at the top of the annular area; the outer pile casing and the inner pile casing are relatively fixed through a connecting structure, a middle area is defined by the inner pile casing, a plurality of communicating holes are formed in the inner pile casing, and the middle area is communicated with the annular area through the communicating holes. Therefore, when the slurry retaining wall is adopted for rotary excavating and hole forming, the slurry can freely flow between the middle area and the annular area through the design of the top opening and the communicating hole, and when rotary excavating and reverse rotating are carried out, the slurry in the annular area enters through the communicating hole to supplement the slurry at the bottom of the drilling bucket. Negative pressure formed between the bottom of the drilling bucket and inner and outer pile casings is reduced, and construction efficiency is improved.

Description

Technical Field

[0001] The utility model patent relates to the technical field of casing, specifically, to a casing structure for improving rotary drilling efficiency. Background Art

[0002] As an important part of structures such as high-rise buildings, highway bridges, and dam foundations, the construction efficiency and quality of bored piles directly affect the progress and quality of the entire project. In the traditional bored pile construction process, mud wall rotary drilling technology is often used, which has the advantages of strong adaptability to the formation and high drilling quality. However, when the rotary drilling is reversed and unearthed, negative pressure is easily formed between the bottom of the drill bucket and the atmosphere, resulting in reduced drilling efficiency and even difficulty in drilling. This negative pressure problem not only increases the difficulty of construction, but may also affect the drilling quality and construction safety.

[0003] In the prior art, a hole is opened at the top of the rotary drilling bucket, and when the rotary drilling is reversed to dig out the earth, part of the mud inside the drilling bucket is discharged to reduce the negative pressure. However, this method is not very effective. Utility Model Content

[0004] The utility model aims to provide a casing structure for improving rotary drilling efficiency, aiming to solve the problem in the prior art that when rotary drilling is reversed to excavate, negative pressure is formed between the bottom of the drill bucket and the atmosphere, resulting in low drilling efficiency.

[0005] The utility model is achieved in this way. A casing structure for improving rotary drilling efficiency is characterized in that it comprises an inner casing and an outer casing, wherein the outer casing is sleeved on the outer circumference of the inner casing, an annular area is formed between the outer casing and the inner casing, and a top opening is formed at the top of the annular area; the outer casing and the inner casing are relatively fixed by a connecting structure, the inner casing surrounds and forms a middle area, and a plurality of connecting holes are provided on the inner casing, and the plurality of connecting holes connect the middle area with the annular area.

[0006] Optionally, the bottom of the annular area is closed.

[0007] Optionally, the top of the outer casing is higher than the top of the inner casing.

[0008] Optionally, an annular plate is connected between the bottom of the outer casing and the bottom of the inner casing, and the annular plate seals the bottom of the annular area.

[0009] Optionally, the bottom of the outer casing is lower than the bottom of the inner casing, and the annular plate is arranged to extend upward and tilt along the radial inward direction.

[0010] Optionally, the connecting structure is arranged in an annular area.

[0011] Optionally, the connecting structure includes a plurality of rib plates which are arranged along the height direction of the inner casing. The outer end surface of each rib plate is connected to the outer casing, and the inner end surface of each rib plate is connected to the inner casing.

[0012] Optionally, the plurality of rib plates are arranged at intervals along the circumferential direction of the inner casing.

[0013] Optionally, a reinforcing ring is arranged in the annular region. The reinforcing ring is arranged to surround along the circumferential direction of the inner casing, and the reinforcing ring abuts against the outer periphery of the inner casing. The plurality of reinforcing rings are arranged at intervals along the height direction of the inner casing.

[0014] Optionally, a plurality of mounting grooves which are recessed inward are formed on the inner end surface, and the reinforcing ring is embedded in the mounting grooves.

[0015] Compared with the prior art, for the casing structure for improving the rotary drilling efficiency provided by the present utility model, when rotary drilling with mud retaining wall is adopted to form a hole, through the design of the top opening and the communication holes, the mud can flow freely between the middle region and the annular region. When the soil is excavated by rotary drilling in reverse, the mud in the annular region enters through the communication holes to supplement the mud at the bottom of the drill bucket, so as to reduce the negative pressure formed between the bottom of the drill bucket and the inner and outer casings and improve the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a top view schematic diagram of the casing structure for improving the rotary drilling efficiency provided by the present utility model;

[0017] Figure 2 is a cross-sectional schematic diagram of the casing structure for improving the rotary drilling efficiency provided by the present utility model;

[0018] Figure 3 is a cross-sectional schematic diagram at the position of the reinforcing ring provided by the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model 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 only used to explain the present utility model, and are not used to limit the present utility model.

[0020] The implementation of the present utility model will be described in detail below with reference to specific embodiments.

[0021] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present utility model 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. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] Referring to Figures 1-3 as shown, it is a preferred embodiment provided by the present utility model.

[0023] The casing structure for improving the rotary drilling efficiency provided by the present utility model includes an inner casing 100 and an outer casing 300. The outer casing 300 is sleeved on the outer periphery of the inner casing 100. An annular region is formed at an interval between the outer casing 300 and the inner casing 100, and the top of the annular region forms a top opening; the outer casing 300 and the inner casing 100 are relatively fixed through a connection structure. The inner casing 100 encloses a central region, and a communication hole 101 is provided on the inner casing 100. The communication hole 101 communicates the central region with the annular region.

[0024] For the above-mentioned casing structure for improving the rotary drilling efficiency, when using mud-supported rotary drilling to form a hole, through the design of the top opening and the communication hole 101, the mud can flow freely between the central region and the annular region. When the drill is rotated in reverse to remove the soil, the mud in the annular region enters through the communication hole 101 to supplement the mud at the bottom of the drill bucket, so as to reduce the negative pressure formed between the bottom of the drill bucket and the inner and outer casings 300 and improve the construction efficiency.

[0025] The bottom of the annular region is closed. In this way, the flow direction of the mud is controlled to prevent the mud in the annular region from flowing downward and being lost.

[0026] The top of the outer casing 300 is higher than the top of the inner casing 100. In this way, it is easier for the mud in the central region to flow into the annular region through the top opening.

[0027] Specifically, an annular plate 400 is connected between the bottom of the outer casing 300 and the bottom of the inner casing 100, and the annular plate 400 closes the bottom of the annular region.

[0028] The bottom of the outer casing 300 is lower than the bottom of the inner casing 100. Along the direction radially inward, the annular plate 400 extends obliquely upward. In this way, the combination of the bottom of the inner casing 100, the bottom of the outer casing 300 and the annular plate 400 forms a bottom sharp angle, and the bottom sharp angle reduces the resistance when the casing breaks the soil, making it easier for the casing to be pressed into the soil layer.

[0029] In this embodiment, the connecting structure is arranged in the annular region.

[0030] Specifically, the connection structure includes a plurality of ribs 200, which are arranged along the height direction of the inner casing 100, the outer end faces of the ribs 200 are connected to the outer casing 300, and the inner end faces of the ribs 200 are connected to the inner casing 100. In this way, the inner casing 100 and the outer casing 300 are fixed by the ribs 200, which increases the stability of the entire casing structure, ensures the relative positions of the inner and outer casings 300, and effectively prevents the casing from being deformed or displaced due to external forces during the construction process.

[0031] A plurality of ribs 200 are arranged at intervals along the circumference of the inner casing 100. In this way, the connection between the inner casing 100 and the outer casing 300 is strengthened, and the overall strength of the inner casing 100 is further enhanced to avoid deformation.

[0032] As a preferred embodiment, a reinforcement ring 110 is arranged in the annular region, and the reinforcement ring 110 is arranged around the circumference of the inner casing 100, and the reinforcement ring 110 abuts against the outer periphery of the inner casing 100, and a plurality of reinforcement rings 110 are arranged at intervals along the height direction of the inner casing 100. In this way, the outer periphery of the inner casing 100 is clamped by the design of the reinforcement ring 110 to prevent the inner casing 100 from deformation and enhance the overall strength.

[0033] Specifically, the inner end surface is provided with a plurality of mounting grooves formed by being recessed inwards, and the reinforcing ring 110 is embedded in the mounting grooves. In this way, when the rib plate 200 is installed, positioning installation is achieved, which is convenient for welding.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The casing structure for improving the rotary drilling efficiency is characterized in that It includes an inner casing and an outer casing. The outer casing is sleeved on the outer periphery of the inner casing. An annular region is formed at an interval between the outer casing and the inner casing, and a top opening is formed at the top of the annular region. The outer casing and the inner casing are relatively fixed through a connection structure. The inner casing encloses a middle region, and a plurality of communication holes are provided on the inner casing. The plurality of communication holes communicate the middle region with the annular region.

2. The casing structure for improving the rotary drilling efficiency according to claim 1, wherein, The bottom of the annular region is closed.

3. The casing structure for improving the rotary drilling efficiency according to claim 2, characterized in that The top of the outer casing is higher than the top of the inner casing.

4. The casing structure for improving the rotary drilling efficiency according to claim 2, characterized in that, An annular plate is connected between the bottom of the outer casing and the bottom of the inner casing, and the annular plate closes the bottom of the annular region.

5. The casing structure for improving the rotary drilling efficiency according to claim 4, characterized in that, The bottom of the outer casing is lower than the bottom of the inner casing, and along the radially inward direction, the annular plate extends obliquely upward.

6. The casing structure for improving the rotary drilling efficiency according to any one of claims 1 to 5, characterized in that The connection structure is arranged in the annular region.

7. The casing structure for improving the rotary drilling efficiency according to claim 6, characterized in that, The connection structure includes a plurality of rib plates. The rib plates extend along the height direction of the inner casing. The outer end surface of the rib plate is connected to the outer casing, and the inner end surface of the rib plate is connected to the inner casing.

8. The casing structure for improving the rotary drilling efficiency according to claim 7, characterized in that, The plurality of rib plates are arranged at intervals along the circumferential direction of the inner casing.

9. The casing structure for improving the rotary drilling efficiency according to claim 7, characterized in that Reinforcing rings are arranged in the annular region. The reinforcing rings are arranged in a circumferential direction around the inner casing, and the reinforcing rings abut against the outer periphery of the inner casing. The plurality of reinforcing rings are arranged at intervals along the height direction of the inner casing.

10. The casing structure for improving the rotary drilling efficiency according to claim 9, characterized in that, A plurality of mounting grooves are formed by inward depressions on the inner end surface, and the reinforcing rings are embedded in the mounting grooves.

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