Pile foundation hole construction method

Abstract

The application discloses a pile hole construction method, which comprises the following steps: selecting a suitable point, drilling a hole by using a first drill bit; obtaining the drilling depth; or obtaining the drilling speed; if the drilling depth reaches a first depth threshold L1 and the drilling speed is less than a first speed threshold s1, a second drill bit is switched, wherein the diameter D1 of the first drill bit is greater than the diameter D2 of the second drill bit; and drilling a hole to a design depth L2 by using the second drill bit. Thus, the first drill bit corresponding to the design diameter of the pile hole is used to drill a hole to the first depth threshold, the design diameter of the pile hole can be reached in one drilling process in the first depth threshold range, the drill bit can be replaced according to different depths, the first drill bit is prevented from being deformed or damaged due to a large force when the first drill bit contacts with a hard layer beyond the first depth threshold, the drilling difficulty is reduced, the drilling task is ensured to be completed smoothly, the construction efficiency is improved, the construction cost is saved, and the drilling quality is improved.

Description

Technical Field

[0001] This invention relates to the field of bridge technology, and in particular to a method for constructing pile foundation holes. Background Technology

[0002] With the rapid development of economic construction, more and more bridges spanning rivers have been built in recent years. Pile foundation construction is extremely crucial in bridge engineering, and the pile foundation hole is the most important part of the construction, key to the success of the pile foundation project. Due to the complex and varied geological conditions, existing drilling machines face difficulties drilling into hard rock layers and other relatively hard rock formations. This results in severe drill bit wear, low drilling efficiency, and hinders construction progress, increasing construction costs. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, the object of the present invention is to provide a method for constructing pile foundation holes, which enables rapid drilling, improves construction efficiency, and reduces construction costs.

[0004] The pile foundation hole construction method according to an embodiment of the present invention includes: selecting a suitable location and drilling a hole using a first drill bit; obtaining a drilling depth; or obtaining a drilling speed; if the drilling depth reaches a first depth threshold L1 and the drilling speed is less than a first speed threshold s1, then switching to a second drill bit, wherein the diameter D1 of the first drill bit is greater than the diameter D2 of the second drill bit; and drilling to the designed depth L2 using the second drill bit.

[0005] According to the pile foundation hole construction method of the present invention, a first drill bit matching the design diameter of the pile foundation hole is used to drill to a first depth threshold. The design diameter of the pile foundation hole can be reached in one drilling operation within the depth range of the first depth threshold. When the drilling depth reaches the first depth threshold and the drilling speed is less than a first speed threshold, the first drill bit is switched to a second drill bit with a smaller diameter and higher hardness. The second drill bit continues to drill to the design depth of the pile foundation hole. In this way, the drill bit is changed according to different geological conditions, which can avoid the first drill bit from being deformed or damaged due to contact with hard layers beyond the first depth threshold and being subjected to large forces. It also reduces the drilling difficulty, ensures the smooth completion of the drilling task, improves construction efficiency, saves construction costs, and improves drilling quality.

[0006] Specifically, the first depth threshold L1 satisfies: 0.45L2≤L1≤0.55L2. With this setting, when the depth display shows that the drilling depth of the first drill bit has reached the range of the first depth threshold, the second drill bit can be switched in time to avoid deformation and damage to the first drill bit, and timely switching of the second drill bit can improve drilling efficiency.

[0007] In some embodiments, the construction method further includes: if the drilling depth does not reach a first depth threshold L1, but the drilling speed is less than a first speed threshold s1, then switching to the second drill bit. This setting can prevent the first drill bit from encountering significant resistance at the first depth threshold, thus reducing the drilling speed. Timely switching to the second drill bit ensures the smooth completion of the drilling task, improving construction efficiency. It can also prevent deformation or damage to the first drill bit, thereby extending its service life.

[0008] Specifically, the initial drilling speed of the first drill bit is s2, and the first speed threshold is 0.1s2 to 0.2s2. In this way, the drilling speed of the first drill bit can be compared with the first speed threshold in real time. When the drilling speed of the first drill bit displayed on the speed display is less than the first speed threshold s1, the second drill bit can be switched in time to ensure that drilling can be carried out smoothly.

[0009] Furthermore, the diameter D1 of the first drill bit and the diameter D2 of the second drill bit satisfy the condition: 0.4D1≤D2≤0.6D1. This allows the designed diameter of the pile foundation hole to be reached in one pass within the drilling depth range of the first drill bit. When the first drill bit encounters difficulties, switching to the smaller diameter second drill bit ensures that the second drill bit can smoothly drill to the designed depth, reducing drilling difficulty and improving drilling efficiency.

[0010] In some embodiments, after drilling to the designed depth L2 using the second drill bit, the method further includes: switching to the first drill bit and drilling to the designed depth L2 using the first drill bit. This first drilling to the designed depth L2 using the second drill bit facilitates subsequent enlargement of the hole to the designed depth L2 using the first drill bit, allowing the first drill bit to drill smoothly, avoiding difficulties in drilling, reducing drilling difficulty, and achieving rapid drilling.

[0011] Specifically, selecting suitable locations involves: measuring and positioning, installing steel casings, and positioning the drilling rig. These preparatory works before drilling ensure smooth drilling, guarantee the verticality of the borehole, and improve construction accuracy.

[0012] Preferably, the drilling machine is a rotary drilling rig. This allows for rapid drilling, improves drilling efficiency, accelerates construction progress, and saves construction costs.

[0013] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0015] Figure 1 This is a schematic diagram of the installation of steel casing in the pile foundation hole construction method according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of drilling with the first drill bit within the first depth threshold.

[0017] Figure 3 This is a schematic diagram of switching to the second drill bit for drilling;

[0018] Figure 4 This is a schematic diagram of switching the first drill bit for reaming;

[0019] Figure 5 This is a flowchart of a pile foundation hole construction method according to an embodiment of the present invention.

[0020] Figure label:

[0021] Drilling machine 100, first drill bit 10, second drill bit 20

[0022] 200 steel casing. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] The following is for reference. Figures 1-5 A method for constructing pile foundation holes according to an embodiment of the present invention is described.

[0025] like Figures 2-3 and Figure 5 As shown, the pile foundation hole construction method according to an embodiment of the present invention includes: selecting a suitable location and drilling a hole using a first drill bit 10; obtaining the drilling depth; or obtaining the drilling speed; if the drilling depth reaches a first depth threshold L1 and the drilling speed is less than a first speed threshold s1, then switching to a second drill bit 20, wherein the diameter D1 of the first drill bit 10 is greater than the diameter D2 of the second drill bit 20; and drilling to the designed depth L2 using the second drill bit 20.

[0026] Specifically, a suitable location is selected according to the design drawings, and the surrounding area is leveled according to the selected location. The first drill bit 10 is aimed at the selected location to drill a hole in the ground. The rock layers and the hardness of the geology vary depending on the depth of the ground. Generally, the closer the geology is to the ground, the softer it is, and the farther the geology is from the ground, the harder it is. The difficulty of drilling increases with the depth of the ground.

[0027] It should be noted that the diameter D1 of the first drill bit 10 is consistent with the design diameter of the pile foundation hole. First, the first drill bit 10 is used to drill a hole in the soft rock layer close to the ground so that the hole reaches the design diameter in one go. During the drilling process, the depth display and speed display show the drilling depth and drilling speed of the first drill bit 10 in real time. The first depth threshold L1 is the maximum depth that the first drill bit 10 can drill smoothly. According to practice, the minimum speed at which the first drill bit 10 can drill smoothly within the first depth threshold L1 is the first speed threshold s1. If the drilling depth of the first drill bit 10 exceeds the first depth threshold L1 and the drilling speed is less than the first speed threshold s1, the first drill bit 10 will have difficulty drilling and is easily damaged by hard materials. The second drill bit 20 has a harder hardness than the first drill bit 10, and its diameter is smaller than that of the first drill bit 10. The second drill bit 20 requires less torque and can drill smoothly in hard rock formations. Therefore, when the drilling depth reaches the first depth threshold L1 and the drilling speed is less than the first speed threshold s1, the first drill bit 10 is switched to the second drill bit 20, and the second drill bit 20 is used to continue drilling downwards until the second drill bit 20 drills to the designed depth L2.

[0028] According to the pile foundation hole construction method of the present invention, a first drill bit 10, which matches the design diameter of the pile foundation hole, is used to drill to a first depth threshold. It can drill to the design diameter of the pile foundation hole in one go within the depth range of the first depth threshold. When the drilling depth reaches the first depth threshold and the drilling speed is less than the first speed threshold, the first drill bit 10 is switched to a second drill bit 20 with a smaller diameter and greater hardness. The second drill bit 20 continues to drill to the design depth of the pile foundation hole. In this way, the drill bit is changed according to different geological conditions, which can avoid the first drill bit 10 from being deformed or damaged due to contact with the hard layer when it exceeds the first depth threshold. It also reduces the drilling difficulty, ensures the smooth completion of the drilling task, improves construction efficiency, saves construction costs, and improves drilling quality.

[0029] Specifically, the first depth threshold L1 satisfies: 0.45L2≤L1≤0.55L2.

[0030] It should be noted that the design depth L2 of the pile foundation hole is located in the hard rock layer area. Based on practice, the first depth threshold L1 is set to 0.45L2≤L1≤0.55L2. The minimum of the first depth threshold is 0.45L2 and the maximum is 0.55L2. When the first depth threshold is set within this range, it does not reach the hard rock layer area, and the first drill bit 10 can drill smoothly within the first depth threshold. For example, if the design depth L2 of the pile foundation hole is 80m, the first drill bit 10 can drill smoothly up to 44m. Beyond 44m, the first drill bit 10 will have difficulty drilling. With this setting, when the depth display shows that the drilling depth of the first drill bit 10 has reached the range of the first depth threshold, the second drill bit 20 can be switched in time to avoid deformation and damage of the first drill bit 10. Moreover, timely switching of the second drill bit 20 can improve drilling efficiency.

[0031] like Figure 3 and Figure 5 As shown, in some embodiments, the construction method further includes: if the drilling depth does not reach the first depth threshold L1, but the drilling speed is less than the first speed threshold s1, then switch to the second drill bit 20.

[0032] Specifically, the hardness of the geological strata is related to the environment. In some areas with a high degree of weathering, the geological strata are harder and drilling is more difficult. The first drill bit 10 may encounter drilling difficulties before reaching the first depth threshold L1 during the drilling process. In order to ensure that the drilling can proceed smoothly, the second drill bit 20 needs to be switched in time.

[0033] It should be noted that when the first drill bit 10 is drilling, the speed display shows the current drilling speed of the first drill bit 10 in real time. If the drilling speed of the first drill bit 10 is less than the first speed threshold s1 within the first depth threshold L1, it indicates that the first drill bit 10 is having difficulty drilling within the first depth threshold L1, and it is necessary to switch to the second drill bit 20. This setting can prevent the first drill bit 10 from encountering significant resistance at the first depth threshold, thus reducing its drilling speed. Timely switching to the second drill bit 20 ensures the smooth completion of the drilling task, improves construction efficiency, and also prevents the first drill bit 10 from deforming or being damaged, thereby extending its service life.

[0034] Specifically, the initial drilling speed of the first drill bit 10 is s2, and the first speed threshold is 0.1s2 to 0.2s2.

[0035] It should be noted that the drilling speed of the first drill bit 10 will be affected by the resistance encountered during the drilling process, and the drilling speed will decrease, which will be less than the initial drilling speed s2 of the first drill bit 10. According to practice, the first speed threshold s1 is limited to the range of 0.1s2 to 0.2s2. When the drilling speed of the first drill bit 10 is less than the first speed threshold, the first drill bit 10 will have difficulty drilling.

[0036] For example, the initial drilling speed of the first drill bit 10 is 1 m / h. When the drilling speed of the first drill bit 10 within the first depth threshold decreases to 0.1 m / h, the first drill bit 10 encounters difficulty in drilling and needs to be switched to the second drill bit 20 in a timely manner. In this way, the drilling speed of the first drill bit 10 can be compared with the first speed threshold in real time. When the drilling speed of the first drill bit 10 displayed on the speed display is less than the first speed threshold s1, the second drill bit 20 can be switched in a timely manner to ensure smooth drilling.

[0037] Furthermore, the diameter D1 of the first drill bit 10 and the diameter D2 of the second drill bit 20 satisfy: 0.4D1≤D2≤0.6D1.

[0038] It should be noted that the diameter D1 of the first drill bit 10 matches the design diameter of the pile foundation hole, and the diameter D1 of the first drill bit 10 is larger than the diameter D2 of the second drill bit 20. The diameters D1 of the first drill bit 10 and D2 of the second drill bit 20 satisfy 0.4D1≤D2≤0.6D1. For example, when the design diameter of the pile foundation hole is 2.5m, if a 2.5m diameter drill bit is selected as the first drill bit 10, the second drill bit 20 can be selected with a maximum diameter of 1.5m and a minimum diameter of 1m. In this way, the design diameter of the pile foundation hole can be reached in one pass within the drilling depth range of the first drill bit 10. When the first drill bit 10 encounters difficulties, switching to the smaller diameter second drill bit 20 ensures that the second drill bit 20 can smoothly drill to the design depth, reducing drilling difficulty and improving drilling efficiency.

[0039] like Figure 4 and Figure 5 As shown, in some embodiments, after drilling to the designed depth L2 through the second drill bit 20, the method further includes: switching to the first drill bit 10 and drilling to the designed depth L2 through the first drill bit 10.

[0040] Specifically, the diameter D2 of the second drill bit 20 is smaller than the design diameter of the pile hole. The second drill bit 20 cannot reach the design diameter of the pile hole in one go. Therefore, after the second drill bit 20 drills to the design depth L2, it is necessary to switch to the first drill bit 10 and enlarge the hole to the design diameter of the pile hole using the first drill bit 10. In this way, drilling to the design depth L2 with the second drill bit 20 first facilitates the subsequent enlargement of the hole to the design depth L2 by the first drill bit 10, enabling the first drill bit 10 to drill smoothly and avoiding the situation where the first drill bit 10 has difficulty drilling, thus reducing the drilling difficulty and achieving rapid drilling.

[0041] like Figure 1 As shown, specifically, selecting a suitable location involves: measuring and positioning, burying the steel casing 200, and positioning the drilling machine 100.

[0042] It should be noted that before pile foundation construction, the coordinates of the pile foundation center point should first be calculated according to the design drawings. The polar coordinate method can be used to accurately measure the pile foundation center point. The drilling rig 100 platform should be erected, ensuring sufficient rigidity to maintain stability and withstand all construction pressure from above. The steel casing 200 should be installed. Before installation, protective piles should be installed to ensure the center of the steel casing 200 aligns with the center of the pile foundation, preventing deviations beyond the allowable range. After the steel casing 200 is installed, the drilling rig 100 is moved onto the drilling rig 100 platform, aligning the drill bit center with the pile foundation center. The stability of the drilling rig 100 is checked, and drilling begins only after verification. These preparatory steps ensure smooth drilling, guarantee drill verticality, and improve construction accuracy.

[0043] Preferably, the drilling machine 100 is a rotary drilling rig. Rotary drilling rigs can adapt to various geological formations, and they have a large torque, which allows them to directly rotate and excavate drilling cuttings such as soil or gravel using powerful torque. This enables rapid drilling, improves drilling efficiency, speeds up construction progress, and saves construction costs.

[0044] In the description of this invention, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0046] In the description of this invention, "a plurality of" means two or more.

[0047] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0048] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for constructing pile foundation holes, characterized in that, include: Select a suitable location and drill a hole using the first drill bit. The initial drilling speed of the first drill bit is s2, and the first speed threshold is 0.1s2 to 0.2s2. To obtain the drilling depth; or to obtain the drilling speed; If the drilling depth reaches a first depth threshold L1 and the drilling speed is less than a first speed threshold s1, then switch to the second drill bit, wherein the diameter D1 of the first drill bit is greater than the diameter D2 of the second drill bit. Drill to the designed depth L2 using the second drill bit, where the first depth threshold L1 satisfies: 0.45L2≤L1≤0.55L2, and the diameters D1 and D2 of the first and second drill bits satisfy: 0.4D1≤D2≤0.6D1. After drilling to the designed depth L2 using the second drill bit, the process further includes: switching to the first drill bit and drilling to the designed depth L2 using the first drill bit.

2. The pile foundation hole construction method according to claim 1, characterized in that, The construction method further includes: if the drilling depth does not reach the first depth threshold L1, but the drilling speed is less than the first speed threshold s1, then switch the second drill bit.

3. The pile foundation hole construction method according to claim 1, characterized in that, The selection of a suitable location specifically involves: measuring and positioning to determine the center point of the pile foundation; Install a steel casing, aligning the center of the steel casing with the center point of the pile foundation; The drilling machine is positioned so that the center of the drilling machine bit is aligned with the center point of the pile foundation.

4. The pile foundation hole construction method according to claim 3, characterized in that, The drilling machine used is a rotary drilling rig.

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