Steel pipe pile supporting system suitable for weathered rock stratum

Abstract

The steel pipe pile supporting system comprises a pile body, the upper portion of the pile body is located in a soil slope, the lower portion of the pile body is located in the weathered rock stratum, a plurality of grouting holes are formed in the pile body, the grouting holes are distributed at intervals in the axial direction of the pile body, a plurality of protruding edges are arranged on the pile body, and the protruding edges are arranged at intervals in the axial direction of the pile body. The utility model has the beneficial effects that the cement paste injected from the grouting holes fills the cracks and is bonded with the pile body and the rock stratum, and the contact area and the friction force are increased by the convex edges, so that the bonding force between the pile body and the weathered rock stratum is improved, and the weathered rock stratum is prevented from being damaged. It is ensured that the pile body is stable in a weathered rock stratum, and the overall stability of a supporting system is enhanced.

Description

Technical Field

[0001] This application relates to the field of steel pipe piles, and in particular to a steel pipe pile support system suitable for weathered rock formations. Background Technology

[0002] Weathered rock strata are a common type of geological formation in geological engineering. They are characterized by weak rock structure and susceptibility to damage, making them prone to safety hazards such as collapses and landslides in support engineering projects. Steel pipe piles, as an effective support measure, can effectively reinforce and support weathered rock strata, ensuring the safety and stability of the project.

[0003] Chinese utility model patent CN212248284U proposes a steel pipe pile protection system for mixed slopes with weak foundations, including hard rock layer, weathered rock layer and soil slope. A retaining wall is fixedly installed on the surface of the hard rock layer. A drainage ditch is set at the top of the soil slope. Steel pipe piles are arranged in an arc-shaped staggered pattern on the surface of the soil slope. The steel pipe piles are fitted with internal reinforcing bars. A capping beam is constructed on the part of the steel pipe pile that is higher than the surface of the soil slope. A shotcrete protective layer is installed on the outside of the capping beam. The shotcrete protective layer connects the anchor rods, retaining wall and capping beam.

[0004] The aforementioned technologies have the following drawbacks: the weathered rock layer is not only relatively soft, but also contains internal fissures, and the outer wall of the steel pipe piles is relatively flat. Therefore, the adhesion to the rock layer is weak, resulting in poor support effect. Utility Model Content

[0005] In order to improve the adhesion between steel pipe piles and weathered rock layers, this application provides a steel pipe pile support system suitable for weathered rock layers.

[0006] This application provides a steel pipe pile support system suitable for weathered rock formations, employing the following technical solution:

[0007] A steel pipe pile support system suitable for weathered rock strata includes a pile body, the upper part of which is located within a soil slope, and the lower part of which is located within a weathered rock strata. The pile body is provided with a plurality of grouting holes, which are distributed at intervals along the axial direction of the pile body. The pile body is provided with a plurality of protruding ridges, which are arranged in a ring around the pile body and extend along the length direction of the pile body.

[0008] By adopting the above technical solution, when constructing the steel pipe pile support system, the pile body is first positioned so that its upper part is within the soil slope and its lower part extends into the weathered rock layer, initially providing a supporting foundation for the superstructure. This setting across different geological layers utilizes the certain bearing capacity of the soil slope while extending into the weathered rock layer to obtain more stable support. Special grouting material is injected into the grouting hole through external grouting equipment. Under pressure, the injected cement grout flows along the grouting hole to the surrounding weathered rock layer. As the cement grout solidifies, it tightly bonds the pile body to the surrounding weathered rock layer. When the pile body is subjected to the load from the superstructure and attempts to displace within the weathered rock layer, a strong frictional force is generated between the protrusions and the weathered rock layer. The protrusions embed into the weathered rock layer, preventing the pile body from moving and further enhancing the stability of the pile body within the weathered rock layer.

[0009] Preferably, the surface of the protruding ridge is covered with an anti-slip layer.

[0010] By adopting the above technical solution, when the anti-slip layer is connected to the convex surface, the roughness of the contact area between the convex and the weathered rock layer is increased. This rough surface structure significantly increases the contact area between the weathered rock layer and the convex. When the pile is subjected to external force and attempts to move in the weathered rock layer, the particles in the weathered rock layer and the rough texture of the anti-slip layer surface interlock with each other, generating a strong frictional force that hinders the movement of the pile and thus enhances the anchoring effect of the pile in the weathered rock layer.

[0011] Preferably, an anchor rod is slidably connected inside the grouting hole. The anchor rod is hollow. A grouting pipe is slidably connected inside the pile along the length of the pile. The bottom of the grouting pipe is spherical. Before the pile is anchored into the rock stratum, the anchor rod is located inside the pile. After the pile is anchored into the rock stratum, the grouting pipe slides along the pile. The bottom of the grouting pipe abuts against the end of the anchor rod, pushing the anchor rod out of the pile.

[0012] By adopting the above technical solution, after the pile is successfully anchored into the rock stratum, the sliding operation of the grouting pipe is initiated, allowing the grouting pipe to slide along the pile towards the bottom of the pile. Since the bottom of the grouting pipe is spherical, it can accurately abut the anchor rod when it slides to contact the end of the anchor rod. As the grouting pipe continues to slide, it generates a continuous thrust on the anchor rod, pushing the anchor rod out of the grouting hole and out of the pile. After being pushed out of the pile, the anchor rod enters the weathered rock stratum. Since the anchor rod is hollow, additional anchoring material can be injected through the hollow part during its entry into the rock stratum to enhance the anchoring force between the anchor rod and the rock stratum. The anchor rod plays a further anchoring role in the rock stratum, increasing the connection strength and stability between the pile and the rock stratum.

[0013] Preferably, the bottom of the pile body is provided with a pointed tip.

[0014] By adopting the above technical solution, the shape of the tip can provide a clear guide for the pile to enter the weathered rock layer, so that the pile can penetrate vertically downward in the designed direction during the process of driving or pressing into the rock layer, reducing the possibility of the pile deviating or tilting, and ensuring that the pile accurately reaches the predetermined depth and position, thereby ensuring the accuracy and stability of the entire support system.

[0015] Preferably, the pile body is connected to a helical blade, which extends from the bottom of the pile body to the top of the pile body.

[0016] By adopting the above technical solution, during the process of implanting the pile into the weathered rock layer, the spiral blades act like screws. When a rotational force is applied to the pile, the spiral blades rotate together with the pile. Due to the certain tilt angle of the spiral blades, they generate a downward and outward compressive force on the surrounding weathered rock layer. This compressive force causes the particles in the rock layer to shift, creating space for the pile to be implanted. In addition, the spiral blades increase the contact area and tightness between the pile and the weathered rock layer. After the pile is implanted, the spiral blades interlock with the surrounding rock layer. When the pile is subjected to external force and tends to move upward or downward, the friction between the spiral blades and the rock layer will hinder this movement.

[0017] Preferably, the pitch of the helical blade gradually increases from the bottom end of the pile towards the top end of the pile.

[0018] By adopting the above technical solution, at the bottom of the pile, due to the small pitch, the helical blades have a closer contact with the rock strata, and the friction and interlocking forces are mainly concentrated in a small area, which can effectively resist the settlement and horizontal displacement at the bottom of the pile. As the pile moves upward, the pitch increases, the contact area between the helical blades and the rock strata decreases relatively, but the distribution range is wider. This helps to distribute the upper load borne by the pile more evenly to a larger area of ​​the rock strata, avoid excessive local stress on the upper part of the pile, and improve the overall bearing capacity and stability of the pile.

[0019] Preferably, an anchor cable is connected to the top of the pile, and the anchoring end of the anchor cable is connected to the weathered rock layer.

[0020] By adopting the above technical solution, the pile, anchor cable and weathered rock layer form a working whole. The pile provides the main bearing capacity in the vertical direction and transfers the upper load to the rock layer; the anchor cable plays a role in the horizontal direction and in tensile strength, and works together with the pile to resist various external forces.

[0021] Preferably, the outer side of the pile body is connected with an anti-corrosion layer.

[0022] By adopting the above technical solution, the anti-corrosion layer can isolate the pile body from the surrounding corrosive media. Weathered rock layers may contain various chemical components, such as moisture, oxygen, salt, and some acidic or alkaline substances. These substances may react chemically with the pile material, leading to pile corrosion. The anti-corrosion layer acts as a barrier, preventing these corrosive media from directly contacting the pile body, thereby slowing down or avoiding the occurrence of corrosion.

[0023] In summary, this application includes the following beneficial technical effects:

[0024] The cement grout injected into the grouting holes fills the cracks and bonds with the pile and rock strata. The increased contact area and friction from the protruding edges enhance the adhesion between the pile and the weathered rock strata, ensuring the pile is stable in the weathered rock strata and improving the overall stability of the support system. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the support system provided by this utility model;

[0026] Figure 2 This is a first-view overall structural diagram of the pile body provided by this utility model;

[0027] Figure 3 This is a second-view overall structural diagram of the pile body provided by this utility model.

[0028] Figure label:

[0029] 1. Pile body; 11. Grouting hole; 12. Protruding ridge; 121. Anti-slip layer; 13. Anchor rod; 14. Grouting pipe; 15. Tip; 16. Helical blade; 17. Anchor cable; 171. Anchoring end; 2. Soil slope; 3. Weathered rock layer. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This utility model provides a steel pipe pile support system suitable for weathered rock strata, the structure of which is as follows: Figure 1 - Figure 3 As shown, the pile body 1 is located in the soil slope 2 at its upper part and in the weathered rock layer 3 at its lower part. The pile body 1 is provided with multiple grouting holes 11, which are distributed at intervals along the axial direction of the pile body 1. The pile body 1 is provided with multiple protruding ridges 12, which are arranged around the pile body 1 and extend along the length direction of the pile body 1.

[0032] When using the steel pipe pile support system, the pile body 1 is first positioned so that its upper part is within the soil slope 2 and its lower part extends into the weathered rock layer 3, providing a preliminary support foundation for the superstructure. This arrangement across different geological layers utilizes the certain bearing capacity of the soil slope 2 while extending into the weathered rock layer 3 to obtain more stable support. Special grouting material is injected into the grouting hole 11 through external grouting equipment. Under pressure, the injected cement grout flows along the grouting hole 11 to the surrounding weathered rock layer 3. As the cement grout solidifies, it tightly bonds the pile body 1 to the surrounding weathered rock layer 3. When the pile body 1 is subjected to the load from the superstructure and displacement occurs in the weathered rock layer 3, a strong frictional force is generated between the protrusion 12 and the weathered rock layer 3. The protrusion 12 embeds into the weathered rock layer 3, preventing the pile body 1 from moving and further enhancing the stability of the pile body 1 in the weathered rock layer 3.

[0033] In this invention, the cement grout injected into the grouting hole 11 fills the cracks and bonds with the pile body 1 and the rock layer. The increased contact area and friction of the protruding ridge 12 enhance the adhesion between the pile body 1 and the weathered rock layer 3, ensuring that the pile body 1 is stable in the weathered rock layer 3 and enhancing the overall stability of the support system.

[0034] To improve the anchoring effect of convex rib 12, please refer to... Figure 1 In a preferred embodiment, the surface of the protruding ridge 12 is connected to an anti-slip layer 121.

[0035] When in use, after the anti-slip layer 121 is connected to the surface of the protruding ridge 12, it increases the roughness of the contact area between the protruding ridge 12 and the weathered rock layer 3. This rough surface structure significantly increases the contact area between the weathered rock layer 3 and the protruding ridge 12. When the pile 1 is subjected to external force and attempts to move in the weathered rock layer 3, the particles in the weathered rock layer 3 and the rough texture of the anti-slip layer 121 interlock with each other, generating a strong frictional force that hinders the movement of the pile 1 and thus enhances the anchoring effect of the pile 1 in the weathered rock layer 3.

[0036] To improve the anchoring effect of pile 1, please refer to Figure 2 In a preferred embodiment, an anchor rod 13 is slidably connected inside the grouting hole 11. The anchor rod 13 is hollow. A grouting pipe 14 is slidably connected inside the pile body 1 along the length of the pile body 1. The bottom of the grouting pipe 14 is spherical. Before the pile body 1 is anchored into the rock stratum, the anchor rod 13 is located inside the pile body 1. After the pile body 1 is anchored into the rock stratum, the grouting pipe 14 slides along the pile body 1, and the bottom of the grouting pipe 14 abuts against the end of the anchor rod 13, pushing the anchor rod 13 out of the pile body 1.

[0037] During use, after the pile body 1 is successfully anchored into the rock stratum, the sliding operation of the grouting pipe 14 is initiated, causing the grouting pipe 14 to slide along the pile body 1 towards the bottom of the pile body 1. Since the bottom of the grouting pipe 14 is spherical, when it slides to contact the end of the anchor rod 13, it can accurately abut the anchor rod 13. As the grouting pipe 14 continues to slide, it generates a continuous thrust on the anchor rod 13, pushing the anchor rod 13 out of the grouting hole 11 from the pile body 1. After the anchor rod 13 is pushed out of the pile body 1, it enters the weathered rock stratum 3. Since the anchor rod 13 is hollow, additional anchoring material can be injected through the hollow part during its entry into the rock stratum to enhance the anchoring force between the anchor rod 13 and the rock stratum. The anchor rod 13 plays a further anchoring role in the rock stratum, increasing the connection strength and stability between the pile body 1 and the rock stratum.

[0038] To facilitate the penetration of pile 1 into weathered rock layer 2, and simultaneously reduce damage to weathered rock layer 3, please refer to... Figure 3 In a preferred embodiment, the bottom of the pile body 1 is provided with a tip 15.

[0039] When in use, the shape of the tip 15 can provide a clear guide for the pile 1 to enter the weathered rock layer 3, so that the pile 1 can penetrate vertically downward in the designed direction during the process of driving or pressing into the rock layer, reducing the possibility of the pile 1 deviating or tilting, and ensuring that the pile 1 accurately reaches the predetermined depth and position, thereby ensuring the accuracy and stability of the entire support system.

[0040] To facilitate the penetration of pile 1 into the weathered rock layer 2 and improve the anchoring effect of pile 1, please refer to... Figure 3 In a preferred embodiment, a helical blade 16 is connected to the pile body 1, and the helical blade 16 extends from the bottom of the pile body 1 to the top of the pile body 1.

[0041] During use, when the pile 1 is implanted into the weathered rock layer 3, the spiral blade 16 acts like a screw. When a rotational force is applied to the pile 1, the spiral blade 16 rotates along with the pile 1. Because the spiral blade 16 has a certain tilt angle, it generates a downward and outward squeezing force on the surrounding weathered rock layer 3. This squeezing force causes the particles in the rock layer to shift, creating space for the implantation of the pile 1. In addition, the spiral blade 16 increases the contact area and the tightness of the contact between the pile 1 and the weathered rock layer 3. After the pile 1 is implanted, the spiral blade 16 interlocks with the surrounding rock layer. When the pile 1 is subjected to external force and tends to move upward or downward, the friction between the spiral blade 16 and the rock layer will hinder this movement.

[0042] To further improve the stability of pile 1, please refer to... Figure 2 In a preferred embodiment, the pitch of the helical blade 16 gradually increases from the bottom end of the pile body 1 toward the top end of the pile body 1.

[0043] During use, at the bottom of the pile body 1, due to the small pitch, the helical blades 16 have a tighter contact with the rock strata, and the friction and interlocking forces are mainly concentrated in a small area, which can effectively resist the settlement and horizontal displacement of the bottom of the pile body 1. As the pile body 1 moves upward, the pitch increases, the contact area between the helical blades 16 and the rock strata decreases relatively, but the distribution range is wider. This helps to distribute the upper load borne by the pile body 1 more evenly to a larger area of ​​the rock strata, avoid excessive local stress on the upper part of the pile body 1, and improve the overall bearing capacity and stability of the pile body 1.

[0044] To improve the overall stability of the support system, please refer to... Figure 1 In a preferred embodiment, an anchor cable 17 is connected to the top of the pile body 1, and the anchoring end 171 of the anchor cable 17 is connected to the weathered rock layer 3.

[0045] In use, the pile body 1, the anchor cable 17 and the weathered rock layer 3 form a cooperating whole. The pile body 1 provides the main bearing capacity in the vertical direction, transferring the upper load to the rock layer; the anchor cable 17 plays a role in the horizontal direction and in terms of pull-out resistance, cooperating with the pile body 1 to jointly resist various external forces.

[0046] To reduce the possibility of corrosion of pile 1, please refer to Figure 2 In a preferred embodiment, an anti-corrosion layer is connected to the outer side of the pile body 1.

[0047] During use, the anti-corrosion layer can isolate the pile body 1 from the surrounding corrosive media. The weathered rock layer 3 may contain various chemical components, such as moisture, oxygen, salt, and some acidic or alkaline substances. These substances may react chemically with the pile body 1 material, causing the pile body 1 to corrode. The anti-corrosion layer acts as a barrier to prevent these corrosive media from directly contacting the pile body 1, thereby slowing down or avoiding the occurrence of the corrosion process.

[0048] The implementation principle of a steel pipe pile support system applicable to weathered rock strata in this application embodiment is as follows: When constructing the steel pipe pile support system, the pile body 1 is first positioned so that its upper part is within the soil slope 2 and its lower part extends into the weathered rock strata 3, initially providing a support foundation for the superstructure. This setting across different geological layers utilizes the certain bearing capacity of the soil slope 2, while extending into the weathered rock strata 3 to obtain more stable support. Special grouting material is injected into the grouting hole 11 through external grouting equipment. Under pressure, the injected cement grout flows along the grouting hole 11 to the surrounding weathered rock strata 3. As the cement grout solidifies, it tightly bonds the pile body 1 to the surrounding weathered rock strata 3. When the pile body 1 is subjected to the load transmitted from the superstructure and attempts to displace in the weathered rock strata 3, a strong frictional force is generated between the protrusion 12 and the weathered rock strata 3. The protrusion 12 embeds into the weathered rock strata 3, preventing the movement of the pile body 1 and further enhancing the stability of the pile body 1 in the weathered rock strata 3.

[0049] 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. A steel pipe pile support system suitable for weathered rock strata, characterized in that: The pile includes a pile body (1), the upper part of which is located in the soil slope (2), the lower part of which is located in the weathered rock layer (3), the pile body (1) is provided with a plurality of grouting holes (11), the plurality of grouting holes (11) are distributed at intervals along the axial direction of the pile body (1), the pile body (1) is provided with a plurality of protruding ridges (12), the plurality of protruding ridges (12) are arranged around the pile body (1), and the protruding ridges (12) extend along the length direction of the pile body (1).

2. The steel pipe pile support system suitable for weathered rock strata according to claim 1, characterized in that: The surface of the protruding ridge (12) is connected to an anti-slip layer (121).

3. The steel pipe pile support system suitable for weathered rock strata according to claim 1, characterized in that: An anchor rod (13) is slidably connected inside the grouting hole (11). The anchor rod (13) is hollow. A grouting pipe (14) is slidably connected inside the pile body (1) along the length direction of the pile body (1). The bottom of the grouting pipe (14) is spherical. Before the pile body (1) is anchored into the rock stratum, the anchor rod (13) is located inside the pile body (1). After the pile body (1) is anchored into the rock stratum, the grouting pipe (14) slides along the pile body (1). The bottom of the grouting pipe (14) abuts against the end of the anchor rod (13) and pushes the anchor rod (13) out of the pile body (1).

4. A steel pipe pile support system suitable for weathered rock strata according to claim 1, characterized in that: The bottom of the pile (1) is provided with a pointed tip (15).

5. A steel pipe pile support system suitable for weathered rock strata according to claim 1, characterized in that: A helical blade (16) is connected to the pile body (1), and the helical blade (16) extends from the bottom of the pile body (1) to the top of the pile body (1).

6. A steel pipe pile support system suitable for weathered rock strata according to claim 5, characterized in that: The pitch of the helical blade (16) gradually increases from the bottom end of the pile body (1) toward the top end of the pile body (1).

7. A steel pipe pile support system suitable for weathered rock strata according to claim 1, characterized in that: The top of the pile (1) is connected to an anchor cable (17), and the anchor end (171) of the anchor cable (17) is connected to the weathered rock layer (3).

8. A steel pipe pile support system suitable for weathered rock strata according to claim 1, characterized in that: The outer side of the pile body (1) is connected with an anti-corrosion layer.

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