An enlarged diameter anchor structure for supporting soft soil

Abstract

This application provides an enlarged diameter anchor cable structure for silty soil support, comprising: a high-pressure jet grouting anchor drilling rig, wherein the high-pressure jet grouting anchor drilling rig drills a pile hole at high speed, and the anchor cable enters the pile hole together with the high-pressure jet grouting anchor drilling rig; a disc steel pad, the disc steel pad being movably sleeved on one side of the high-pressure jet grouting anchor drilling rig, and steel wire ropes provided on the anchor cable being fixedly connected at equal intervals around the outer periphery of the disc steel pad; and a pad push plate, the pad push plate being connected to the high-pressure jet grouting anchor drilling rig by threaded connection, and the pad push plate being disposed on one side of the disc steel pad. This application has the advantages of improving pull-out bearing capacity, effectively solving the problem of insufficient pull-out capacity of conventional anchor cables; reducing construction time by more than one-third, greatly improving construction efficiency and reducing time costs; not only reducing material costs, but also simplifying the construction process, further reducing the overall construction cost.

Description

Technical Field

[0001] This application relates to the technical field of silty soil support, and in particular to an enlarged diameter anchor cable structure for silty soil support. Background Technology

[0002] Deep foundation pit support engineering is an indispensable part of urban construction. With the acceleration of urbanization, deep foundation pit support technology has developed rapidly. Among them, "support piles + prestressed anchor cables" is a common support method, widely used in deep foundation pit projects under various soil conditions due to its simple construction and good economy, providing important safety guarantees for building construction. Currently, to improve the anchoring performance of anchor cables, common methods include increasing the anchor cable length, optimizing the grouting process, and improving the anchor cable structure. For example, drilling, anchor cable placement, and grouting are completed in stages, specifically including drilling rig positioning, hole drilling, disassembling drill rods section by section, placing prestressed anchor cables, and grouting in stages. In addition, multi-layer grouting, adjusting grouting pressure, or changing anchor cable materials are also used to improve the anchoring effect. However, these methods generally require operation in a fixed sequence and multiple waiting periods for the grout to solidify, resulting in a long construction cycle. Although the above conventional methods can improve the anchoring performance to a certain extent, they suffer from low construction efficiency. Especially in complex geological conditions such as silty soil, ordinary anchor cables, due to their small diameter and limited pull-out resistance per cable, are insufficient to meet the requirements of high-strength support. Furthermore, the excessively long construction time increases project costs and schedule pressures. Therefore, how to improve construction efficiency while ensuring anchoring effectiveness has become an urgent technical problem to be solved. Utility Model Content

[0003] To improve construction efficiency and address the issue of insufficient pull-out resistance of a single anchor cable, this application provides an enlarged diameter anchor cable structure for silty soil support.

[0004] This application provides an enlarged diameter anchor cable structure for silty soil support, employing the following technical solution:

[0005] An enlarged diameter anchor cable structure for silty soil support includes:

[0006] A high-pressure jet grouting anchoring drilling rig, wherein the high-pressure jet grouting anchoring drilling rig drills a pile hole at high speed, and the anchor cable enters the pile hole together with the high-pressure jet grouting anchoring drilling rig;

[0007] A circular steel pad is movably sleeved in the middle on one side of the high-pressure jet grouting anchoring drilling rig, and steel wire ropes provided on the anchor cable are fixedly connected at equal intervals around the outer periphery of the circular steel pad.

[0008] The pad and push plate are connected to the high-pressure jet grouting anchoring drill by threaded connection, and the pad and push plate are set on one side of the disc steel pad.

[0009] By adopting the above technical solution, the high-pressure jet grouting anchoring drilling rig drills the pile hole at high speed, driving the anchor cable into the pile hole, thus achieving simultaneous drilling and anchoring and improving construction efficiency. A circular steel pad is movably fitted onto one side of the high-pressure jet grouting anchoring drilling rig, with steel wire ropes on the anchor cable fixed at equal intervals around its perimeter, ensuring the stability of the anchor cable during drilling and preventing displacement. A push plate is threadedly connected to the high-pressure jet grouting anchoring drilling rig and positioned on one side of the circular steel pad, providing support and positioning for the circular steel pad during drilling, further enhancing the reliability of the structure.

[0010] Optionally, the high-pressure jet grouting anchoring drill includes a drill rod and a drill bit. The drill rod has a channel for water and cement slurry to pass through. The drill rod has a spray hole on one side, from which water or cement slurry is sprayed out. The drill rod passes through the middle of a disc steel pad, and the drill bit is connected to the drill rod.

[0011] By adopting the above technical solution, the drill rod is equipped with channels for clean water and cement slurry, enabling precise switching and delivery of the two media and ensuring efficient connection between drilling and grouting processes. The ejector holes on the side of the drill rod allow clean water or cement slurry to be ejected at high pressure, effectively cutting the soil during drilling and helping to form an expanded diameter anchoring section during grouting, thereby significantly increasing the frictional resistance and end bearing capacity between the anchoring section and the soil. Simultaneously, the combined use of the drill rod and the disc steel pad ensures the stability and precise positioning of the anchor cable during drilling, effectively reducing construction deviations and further improving construction efficiency and overall support effectiveness.

[0012] Optionally, the disc-shaped steel pad is located between the drill rod and the drill bit.

[0013] By adopting the above technical solution, placing a disc-shaped steel pad between the drill rod and the drill bit provides stable positioning support for the anchor cable during drilling. This design not only ensures that the disc-shaped steel pad is accurately fixed in the predetermined position but also effectively prevents the anchor cable from shifting during drilling, thereby improving the accuracy and stability of the construction. Furthermore, the positioning function of the disc-shaped steel pad provides a reliable foundation for the subsequent formation of the enlarged pile hole, helping to ensure the forming quality of the enlarged head, and thus significantly improving the pull-out bearing capacity of the anchor cable and the overall support effect.

[0014] Optionally, the disc steel pad has a central hole in the middle, and a number of equally spaced connecting holes are opened around the central hole.

[0015] By adopting the above technical solution, a central hole is set in the middle of the disc-shaped steel pad, and several equally spaced connecting holes are opened around the central hole, so that the steel wire rope of the anchor cable can be evenly distributed and fixed in the connecting holes. This structural design ensures that the anchor cable is subjected to balanced force during drilling, improving the stability of the overall structure. At the same time, the central hole provides precise positioning and support for the drill rod, ensuring the smooth progress of the drilling process, thereby improving construction efficiency and anchoring effect.

[0016] Optionally, the steel wire ropes on the anchor cable pass through connecting holes, and the high-pressure jet grouting anchoring drill uses clean water jet grouting to assist drilling, thereby expanding the diameter of the anchoring section of the anchor cable to 500mm.

[0017] By adopting the above technical solution, the diameter of the anchoring section of the anchor cable is increased to 500mm, significantly increasing the frictional resistance between the anchor body and the soil, and forming end bearing capacity between the enlarged head end and the soil, thereby greatly improving the pull-out bearing capacity without increasing the length of the anchor cable. In addition, this technical solution uses a high-pressure jet grouting drilling rig to achieve water jet assisted drilling, optimizing the construction process, shortening the construction time, and improving construction efficiency.

[0018] Optionally, the wire rope is fixed in the connecting hole by a nut.

[0019] By adopting the above technical solution, the wire rope is fixed in the connection hole with a nut, making the connection between the anchor cable and the disc steel pad more stable and reliable. This fixing method not only improves the overall stability of the structure, but also ensures that the anchor cable will not loosen or fall off during the stress process, thereby enhancing the pull-out resistance of the anchor cable. In addition, this design simplifies the installation process, facilitates construction operations, and improves construction efficiency.

[0020] Optionally, a planar bearing is fixedly sleeved in the central hole.

[0021] By adopting the above technical solution, a flat bearing is fixedly fitted in the central hole of the disc steel pad, which can effectively reduce the frictional resistance of the drill rod during rotation, improve drilling efficiency, and extend the service life of the components. Specifically, the flat bearing makes the rotation of the drill rod within the central hole smoother, reduces heat and wear caused by friction, thereby ensuring the stability and reliability of the drilling process.

[0022] Optionally, the drill rod is fitted onto the central hole via a planar bearing.

[0023] By adopting the above technical solution, the drill rod is fitted into the central hole of the disc steel pad via a plane bearing, enabling the drill rod to operate stably and smoothly during high-speed rotation, reducing frictional resistance and wear, and improving equipment lifespan and construction efficiency. Specific effects include: firstly, ensuring the drill rod maintains a precise axial position during jet grouting operations, avoiding anchor cable installation deviations caused by misalignment; and secondly, ensuring effective transmission of jet grouting pressure by reducing frictional loss, thereby enhancing the quality and stability of the enlarged head formation.

[0024] Optionally, the drill rod reverses and disengages from the plane bearing, and cement slurry is sprayed while the drill rod is withdrawing from the pile hole. The high-pressure jet grouting anchoring drill and the pad plate push plate withdraw from the pile hole simultaneously. The disc steel pad, anchor cable, and plane bearing are left in the pile hole. The other end of the drill rod is connected to the delivery pipe. The clean water or cement slurry in the delivery pipe is pressurized by a high-pressure variable frequency grouting pump and delivered to the drill rod.

[0025] By adopting the above technical solution, after the drill rod reverses and disengages from the plane bearing, it can continuously inject cement grout during the withdrawal process from the pile hole, ensuring that the anchoring section forms an enlarged head while maintaining the grouting quality of the free section. The high-pressure jet grouting anchoring drill and the pad plate pusher simultaneously withdraw from the pile hole, allowing the disc steel pad, anchor cable, and plane bearing to remain stably embedded in the pile hole, achieving precise installation of the anchor cable structure. Furthermore, the other end of the drill rod is connected to a delivery pipe, and a high-pressure variable frequency grouting pump pressurizes and delivers clean water or cement grout, ensuring the continuity and pressure stability of the grouting process. This significantly improves construction efficiency, shortens construction time, and enhances the pull-out bearing capacity and overall anchoring effect of the anchor cable.

[0026] In summary, this application includes at least one of the following beneficial effects:

[0027] 1. By adopting a high-pressure jet grouting enlarged head, the diameter of the anchoring section is increased to 500mm, significantly increasing the frictional resistance between the anchor body and the soil and forming end bearing capacity. This greatly improves the pull-out bearing capacity without increasing the length of the anchor cable, effectively solving the problem of insufficient pull-out force of a single conventional anchor cable. 2. The high-pressure jet grouting anchoring drill achieves simultaneous drilling, anchoring, and grouting, avoiding the overlapping and waiting situations in traditional processes. This reduces construction time by more than one-third, greatly improving construction efficiency and reducing time costs. 3. With stronger anchoring tensile force, the amount of anchor cable required can be reduced under the same geological conditions and construction sections. This not only reduces material costs but also simplifies the construction process, further reducing overall construction costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0029] Figure 2 This is an embodiment of the present application. Figure 1 A schematic diagram of the structure of A in the middle;

[0030] Figure 3 This is a schematic diagram of the structure of the disc steel pad in an embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. High-pressure jet grouting anchoring drill; 10. Drill rod; 11. Drill bit; 2. Disc steel pad; 20. Center hole; 21. Connecting hole; 3. Anchor cable; 4. Nut; 5. Pad push plate; 6. Flat bearing. Detailed Implementation

[0032] The following combination Figures 1 to 3 This application will be described in further detail.

[0033] Example 1:

[0034] Embodiment 1 of this application provides an enlarged diameter anchor cable structure for silty soil support.

[0035] refer to Figure 1 The high-pressure jet grouting anchoring drill 1 consists of two parts: a drill rod 10 and a drill bit 11. The drill rod 10 has internal channels for water and cement slurry, and is made of high-pressure resistant materials such as stainless steel or alloy steel. Several ejection holes are evenly distributed on the front surface of the drill rod 10 to ensure uniform ejection of water or cement slurry. In practical applications, the drill rod 10 can be of different lengths and diameters; for example, the diameter can range from 50mm to 100mm, and the length can be customized according to the actual working conditions. The drill bit 11 is connected to the front end of the drill rod 10. The drill bit 11 can be conical or flat, and its material is also high-strength alloy steel to adapt to drilling requirements under different geological conditions.

[0036] refer to Figure 1 and Figure 2 The outer wall of the drill rod 10 can be textured with spiral or straight lines to enhance the cutting effect on the soil during drilling. The cross-sectional shape of the internal channel of the drill rod can be circular, elliptical, or rectangular, depending on the actual needs. Furthermore, the ejection orifice of the drill rod 10 can be replaced with a nozzle structure. The nozzle can be selected according to the required injection pressure and flow rate; for example, the nozzle orifice diameter can be adjusted from 1mm to 5mm. The drill bit 11, as a key component at the front end of the drill rod 10, directly affects drilling efficiency through its geometry and cutting edge angle.

[0037] Reference 2 and Figure 3The disc-shaped steel pad 2 is located between the drill rod 10 and the drill bit 11, and its main function is to fix the anchor cable 3 and provide stable support. The disc-shaped steel pad 2 has a central hole 20 in the middle, which is circular in shape. Several equally spaced connecting holes 21 are formed around the central hole 10; these connecting holes 21 are used to fix the steel wire rope on the anchor cable 3. The number and layout of the connecting holes 21 can be adjusted according to the design requirements of the anchor cable 3. The disc-shaped steel pad 2 itself can be made of high-strength steel plate with a thickness ranging from 10mm to 30mm to ensure sufficient strength and rigidity.

[0038] refer to Figure 2 The pad-push plate 5 is connected to the high-pressure jet grouting anchoring drill rig 1 via threaded connections and is positioned on one side of the disc steel pad 2. The main function of the pad-push plate 5 is to apply appropriate jacking force to the disc steel pad 2 during drilling, preventing it from shifting or being damaged. The pad-push plate 5 is also made of high-strength steel. To improve the jacking effect, the contact surface of the pad-push plate 5 can be designed with a rough surface or with anti-slip textures to increase friction.

[0039] The implementation principle of this embodiment 1 is as follows: drilling is achieved through the high-speed rotation of the high-pressure jet grouting anchoring drill 1, while the high-pressure jetting of clean water or cement slurry completes the hole diameter enlargement and grouting operations. The disc steel pad 2 and the pad pusher plate 5 work together to ensure the stability of the anchor cable 3 during drilling, ultimately forming an anchoring section with an enlarged diameter. This simultaneous construction method not only significantly shortens the construction time but also significantly improves the anchoring effect, meeting the dual requirements of high efficiency and reliability for deep foundation pit support projects.

[0040] Example 2:

[0041] Embodiment 2 of this application provides an enlarged diameter anchor cable structure for silty soil support.

[0042] refer to Figure 1 and Figure 2 The difference between Embodiment 2 and Embodiment 1 in this application is that the diameter of the pile hole in the anchoring section of the anchor cable 3 is enlarged to 500mm. The high-pressure jet grouting enlarged head is adopted. The cutting and grouting force applied by the copper drum ultra-high pressure jet grouting in the anchoring section enlarges the diameter of this section. The cement grout and soil combine to form a cement-soil "enlarged head", which has a pull-out bearing capacity far exceeding that of conventional anchor cables, thus improving the anchoring effect.

[0043] refer to Figure 2 and Figure 3A planar bearing 6 is fixedly fitted into the center hole 20 of the disc-shaped steel pad 2. The drill rod 10 is fitted into the center hole 20 through the planar bearing 6. This design effectively reduces the coefficient of friction between the drill rod 10 and the disc-shaped steel pad 2. The inner ring of the planar bearing 6 is tightly fitted with the drill rod 10. There is usually a certain gap or loose space between the pad pusher plate 5 and the planar bearing 6 to ensure smooth disengagement during reverse rotation. When the drill rod 10 reverses, the rotational motion is converted into axial tension through the thread, pulling the pad pusher plate 5 backward. The outer ring of the planar bearing 6 is fixedly connected to the disc-shaped steel pad 2. To improve sealing performance, a sealing ring can also be added around the planar bearing 6 to prevent mud from seeping in and affecting the normal operation of the planar bearing 6.

[0044] refer to Figure 2 The pad plate pusher plate 5 is connected to the drill rod 10 by a threaded connection. Since the drill rod 10 is not fixedly connected to the inner ring of the plane bearing 6, the plane bearing 6 will move along the drill rod 10 during the drilling process. Therefore, a pad plate pusher plate 5 is set on one side of the disc steel pad plate 2. The drill rod 10 passes through the middle of the pad plate pusher plate 5 and is threadedly connected, so that the drill rod 10 is held by the pad plate pusher plate 5 and pushed into the pile hole during the rotation process.

[0045] refer to Figure 1 and Figure 2 A high-pressure jet grouting anchoring drill rig 1 is used, with a wingless drill bit equipped with a nozzle for drilling. A disc steel pad 2 and a pad push ring 5 are set at the front end of the drill rod 10 to fix the prestressed anchor cable 3, so that jet grouting, drilling and anchoring are completed simultaneously in one go. During drilling and anchoring, the nozzle of the front drill bit 11 sprays clean water and jet grouts to cut the soil. Drilling stops when the design hole depth is reached. Then, the drill rod 10 is reversed and high-pressure cement grout is used simultaneously. The drill rod 10 is rotated back section by section to the junction of the anchoring section and the free section of the anchor cable 3. At this time, an enlarged head of the anchoring section larger than the design hole diameter is formed. When the free section is withdrawn, the grouting pressure of the cement grout is changed to maintain the anchor cable 3 to meet the design diameter until the jet grouting drill bit 11 is pulled out of the pile hole.

[0046] The implementation principle of this embodiment 2 is as follows: The introduction of a plane bearing 6 further optimizes the motion characteristics during drilling, reduces energy loss, and improves the overall stability and reliability of the structure. After the drill rod 10 reverses and disengages from the plane bearing 6, cement slurry is sprayed while it exits the pile hole. The high-pressure jet grouting anchoring drill 1 and the pad plate pusher plate 5 simultaneously exit the pile hole, while the disc steel pad plate 2, anchor cable 3, and plane bearing 6 remain in the pile hole. The other end of the drill rod 10 is connected to a delivery pipe, and the clean water or cement slurry in the delivery pipe is pressurized by a high-pressure variable frequency grouting pump and delivered to the drill rod. The high-pressure jet grouting anchoring drill 1, the disc steel pad plate 2, and the pad plate pusher plate 5 all adopt a modular design, with standardized interfaces connecting the modules for easy and rapid assembly and replacement.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An enlarged diameter anchor cable structure for silty soil support, characterized in that, include: High-pressure jet grouting anchor drilling machine (1), the high-pressure jet grouting anchor drilling machine (1) drills a pile hole by high-speed rotation, and the anchor cable (3) enters the pile hole together with the high-pressure jet grouting anchor drilling machine (1); The disc steel pad (2) is movably sleeved in the middle on one side of the high-pressure jet grouting anchor drilling machine (1), and the steel wire ropes provided on the anchor cable (3) are fixedly connected at equal intervals around the disc steel pad (2). The pad push plate (5) is connected to the high-pressure jet grouting anchor drilling machine (1) by threaded connection, and the pad push plate (5) is set on one side of the disc steel pad plate (2).

2. The enlarged diameter cable structure for supporting soft soil according to claim 1, wherein The high-pressure jet grouting anchoring drill (1) includes a drill rod (10) and a drill bit (11). The drill rod (10) has a channel for water and cement slurry to pass through. The drill rod (10) has a jet hole on one side, from which water or cement slurry is jetted out. The drill rod (10) passes through the middle of a disc steel pad (2), and the drill bit (11) is connected to the drill rod (10).

3. An enlarged diameter cable structure for supporting soft ground according to claim 2, wherein The disc steel pad (2) is located between the drill rod (10) and the drill bit (11).

4. The enlarged diameter cable structure for supporting soft soil according to claim 2, wherein The disc steel pad (2) has a central hole (20) in the middle, and a number of equally spaced connecting holes (21) are opened around the central hole (20).

5. An enlarged diameter anchor cable structure for silty soil support according to any one of claims 1, 2, or 4, characterized in that, The steel wire ropes on the anchor cable (3) pass through the connecting holes (21). The high-pressure jet grouting anchor drilling machine (1) uses clean water jet grouting to assist drilling and expands the diameter of the anchor section of the anchor cable (3) to 500mm.

6. An enlarged diameter cable structure for supporting soft ground according to claim 5, wherein The wire rope is fixed in the connecting hole (21) by a nut (4).

7. An enlarged diameter cable structure for supporting soft ground according to claim 4, wherein A planar bearing (6) is fixedly sleeved in the central hole (20).

8. An enlarged diameter cable structure for supporting soft ground according to claim 7, wherein The drill rod (10) is sleeved on the center hole (20) through a plane bearing (6).

9. An enlarged diameter cable structure for supporting a body of soft soil according to claim 7 or 8, characterised in that The drill rod (10) reverses and disengages from the plane bearing (6). The drill rod (10) is ejected from the pile hole while cement slurry is sprayed. The high-pressure jet grouting anchoring drill (1) and the pad plate push plate (5) are ejected from the pile hole at the same time. The disc steel pad plate (2), anchor cable (3), and plane bearing (6) are left in the pile hole. The other end of the drill rod (10) is connected to the delivery pipe. The clean water or cement slurry in the delivery pipe is pressurized by a high-pressure variable frequency grouting pump and delivered to the drill rod (10).

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