Supporting foundation structure suitable for frozen soil area

Abstract

The supporting foundation structure suitable for the frozen soil region comprises a pile foundation cylinder, a pile foundation cylinder top seat, a pile foundation cylinder base and a frost heaving piercing mechanism, the pile foundation cylinder top seat is fixedly installed at the top of the pile foundation cylinder, and the pile foundation cylinder top seat is used for being connected with a to-be-supported target; a pile foundation cylinder base is arranged at the bottom of the pile foundation cylinder, and a plurality of threaded drill rod assemblies are arranged on the pile foundation cylinder base and used for being fixed to a foundation. The frost heaving piercing mechanism is fixedly installed on the cylinder wall of the pile foundation cylinder. When frost heaving happens to a soil body, under the effect of frost heaving, the transverse anchor rod of the frost heaving piercing mechanism can transversely pierce into the soil body outwards, so that the pile foundation cylinder and the surrounding soil body are anchored together. In addition, due to the fact that the inner diameter of the vertical straight pipe section of the frost heaving piercing mechanism is larger than the inner diameter of the top bent pipe section, even if the soil body frost heaving deformation is small, the transverse anchor rod can generate large transverse piercing displacement.

Description

Technical Field

[0001] The invention relates to the technical field of foundation support, and in particular to a support foundation structure suitable for frozen soil areas. Background Art

[0002] Frozen areas are also called permafrost, tundra or tundra. In physical geography, it refers to low temperatures and short growing seasons. In geology, it refers to various rocks and soils below 0°C and containing ice. It can generally be divided into short-term frozen soil, seasonal frozen soil and permafrost. Frost heave refers to the situation in seasonal frozen soil or permafrost areas. In the cold season, when the soil freezes and expands, the supporting foundation fixed in the frozen soil layer is lifted up due to the tangential frost heave force and loses its fixing effect. When the warm season melts, the soil falls back, and the lifted supporting foundation is difficult to return to its original position, resulting in the lifting phenomenon. In view of this, it is necessary to propose an anti-freeze heave supporting foundation structure suitable for use in frozen soil areas.

[0003] At present, the existing anti-freeze support foundation structure requires large-scale excavation of the original foundation and large-scale pouring of concrete to construct a stable support foundation. However, concrete often causes alkalinization of the construction area and affects the growth of surrounding vegetation. Therefore, this construction method will cause ecological damage to nature reserves. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the prior art and provide a supporting foundation structure suitable for frozen soil areas.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A supporting foundation structure suitable for frozen soil areas, comprising a pile foundation tube, a pile foundation tube top seat, a pile foundation tube base and a frost heave piercing mechanism;

[0007] A pile foundation cylinder top seat is fixedly installed on the top of the pile foundation cylinder, and the pile foundation cylinder top seat is used to connect with the target to be supported; the pile foundation cylinder base is arranged at the bottom of the pile foundation cylinder, and a plurality of threaded drill rod assemblies are arranged on the pile foundation cylinder base for fixing with the foundation;

[0008] The frost heave piercing mechanism is fixedly installed on the wall of the pile foundation tube, and the frost heave piercing mechanism includes: an L-shaped main pipe, a sliding rod, a transverse anchor rod, a frost heave force sensing base and a movable earth retaining device, wherein the L-shaped main pipe includes a top curved pipe section and a vertical straight pipe section, the top curved pipe section includes a transverse straight pipe section and a bent pipe section, the bent pipe section of the top curved pipe section is connected to the top of the vertical straight pipe section through a threaded seal, so that the top curved pipe section and the vertical straight pipe section are connected, and the inner diameter of the vertical straight pipe section is larger than the inner diameter of the top curved pipe section;

[0009] A mounting block is fixedly arranged inside the vertical straight pipe section of the L-shaped main pipe, the sliding rod is vertically slidably installed in the mounting block, a limit plate is fixedly arranged at the middle position of the sliding rod, a spring is arranged between the limit plate and the mounting block, and a limit protrusion is arranged inside the bottom end of the vertical straight pipe section of the L-shaped main pipe for limiting the limit plate; a first piston is arranged at the top end of the sliding rod; the transverse anchor rod is slidably installed in the transverse straight pipe section of the top curved pipe section of the L-shaped main pipe, and a second piston is arranged at the tail of the transverse anchor rod; the L-shaped main pipe between the first piston and the second piston is filled with hydraulic oil;

[0010] A frost heave force sensing base is arranged at the bottom end of the sliding rod, and a movable soil retaining device is arranged between the frost heave force sensing base and the vertical straight pipe section of the L-shaped main pipe.

[0011] In the above technical solution, the pile foundation tube base is in the shape of an inverted cone, and the inverted cone-shaped pile foundation tube base can cause the foundation soil inside the foundation hole to exert a downward compression effect on it.

[0012] In the above technical solution, the threaded drill rod assembly includes a threaded barrel, a threaded drill rod and a protective cap. The threaded barrel is fixedly arranged on the base of the pile foundation barrel, the threaded drill rod is installed in the threaded barrel through a thread, the threaded drill rod is used to drill into the foundation, and the protective cap is installed on the top of the threaded drill rod.

[0013] In the above technical solution, a frost heave piercing mechanism mounting frame is provided on the wall of the pile foundation cylinder, and the frost heave piercing mechanism is fixed on the frost heave piercing mechanism mounting frame.

[0014] In the above technical solution, a transverse retaining arm is provided on the frost heave piercing mechanism mounting frame, so that the transverse straight pipe section of the top curved pipe section of the L-shaped main pipe is fixedly welded on the transverse retaining arm.

[0015] In the above technical solution, the movable soil retaining device includes a top fixed cover and N-level sliding sleeves, N is greater than or equal to 2, the top fixed cover is fixedly sleeved on the bottom of the vertical straight pipe section of the L-shaped main pipe, and the N-level sliding sleeves are slidably sleeved in sequence, wherein the uppermost sliding sleeve is vertically slidably installed in the top fixed cover, and the lowermost sliding sleeve is fixedly sleeved on the frost heave force sensing base. In this way, when backfilling, the movable soil retaining device can block the backfill soil, and when frost heave occurs, the movable soil retaining device can prevent the surrounding soil from exerting a downward force on the frost heave force sensing base, and the multi-level sliding sleeve can be vertically extended and retracted, so it will not hinder the upward movement of the frost heave force sensing base.

[0016] In the above technical solution, the front end of the transverse anchor rod is a pointed structure, which is convenient for penetrating into the soil.

[0017] In the above technical solution, barbs are also provided on the transverse anchor rod to facilitate stabilization in the soil after penetrating into the soil.

[0018] In the above technical solution, a limiting ring is further provided at the front end of the transverse straight pipe section of the top curved pipe section of the L-shaped main pipe to limit the extreme position of the transverse anchor rod to be ejected outward to prevent the transverse anchor rod from falling out.

[0019] In the above technical solution, there are multiple frost heave piercing mechanisms, which are evenly distributed on the wall of the pile foundation tube in the circumferential direction.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The supporting foundation structure of the present invention is simple to construct. During construction, a foundation hole is excavated, a threaded drill rod is installed, and then the foundation soil is backfilled. There is no need to excavate a large area in the original foundation and pour concrete (concrete often causes alkalization of the construction area and affects the growth of surrounding vegetation). It is particularly suitable for nature reserves with frozen soil to avoid ecological damage.

[0022] 2. The supporting foundation of the present invention has a frost heave piercing mechanism, and the frost heave force sensing base is used to sense the frost heave force of the soil body, and drives the sliding rod to move upward under the frost heave force. Before frost heave occurs, the bottom end of the sliding rod extends out of the bottom of the vertical straight pipe section of the L-shaped main pipe, and reserves a movable margin for upward movement. When backfilling the foundation soil, a movable soil retaining device can be used to leave a movement space between the frost heave force sensing base and the bottom of the vertical straight pipe section of the L-shaped main pipe. There is no backfill soil in this space, and it will not be affected by the downward frost heave force of the soil body. At the same time, the movable soil retaining device will not hinder the upward movement of the frost heave force sensing base. After the backfilling and burial is completed, when the soil body frost heaves, under the action of frost heave, the sliding rod moves vertically upward, and then drives the transverse anchor rod to penetrate the soil body laterally outward, so that the pile foundation tube is anchored together with the surrounding soil body.

[0023] 3. The frost heave piercing mechanism of the present invention is designed so that the inner diameter of the vertical straight pipe section is larger than the inner diameter of the top curved pipe section. Therefore, a smaller vertical upward displacement of the sliding rod can achieve a larger lateral displacement of the lateral anchor rod, thereby making it possible for the lateral anchor rod to produce a larger lateral piercing displacement even when the frost heave deformation of the soil is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of the installation of the supporting foundation structure suitable for frozen soil areas according to the present invention.

[0025] Figure 2 It is a schematic diagram of the supporting foundation structure suitable for frozen soil areas according to the present invention.

[0026] Figure 3 for Figure 2 An enlarged schematic diagram of point A.

[0027] Figure 4It is a structural schematic diagram of the frost heave penetration mechanism in the present invention (the transverse anchor rod is in a contracted state).

[0028] Figure 5 It is a structural schematic diagram of the frost heave piercing mechanism in the present invention (the transverse anchor rod is in the piercing state). DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1-Figure 3 As shown, a supporting foundation structure suitable for frozen soil areas includes a pile foundation tube 1, a pile foundation tube top seat 2, a pile foundation tube base 3 and a frost heave penetration mechanism 5.

[0031] The pile foundation tube 1 is installed in the foundation 0 (during construction, first, a foundation hole 10 is excavated in the foundation 0, and then the pile foundation tube 1 is installed into the foundation hole 10 and backfilled), and a pile foundation tube top seat 2 is fixedly installed on the top of the pile foundation tube 1, and the pile foundation tube top seat 2 is used to connect with the target to be supported (for example, it can be a pipeline, a road pole, etc.).

[0032] The pile foundation tube base 3 is arranged at the bottom of the pile foundation tube 1. The pile foundation tube base 3 is preferably in an inverted cone shape. The inverted cone-shaped pile foundation tube base 3 can make the foundation soil inside the foundation hole produce a downward compression effect on it; and a plurality of threaded drill rod assemblies are arranged on the pile foundation tube base 3. Specifically, the threaded drill rod assembly includes a threaded tube 31, a threaded drill rod 32 and a protective cap 33. The threaded tube 31 is fixedly arranged on the pile foundation tube base 3. The threaded drill rod 32 is installed in the threaded tube 31 by thread penetration. The threaded drill rod 32 is used to drill into the foundation, so that the stability of the pile foundation tube is better. The protective cap 33 is installed on the top of the threaded drill rod 32.

[0033] The frost heave piercing mechanism 5 is fixedly mounted on the wall of the pile foundation tube 1. Preferably, a frost heave piercing mechanism mounting frame 11 is provided on the wall of the pile foundation tube 1, and the frost heave piercing mechanism 5 is fixed on the frost heave piercing mechanism mounting frame 11. Figure 4 -Attached Figure 5 , the structure and working principle of the frost heave piercing mechanism 5 are specifically introduced.

[0034] The frost heave piercing mechanism 5 includes: an L-shaped main pipe 51, a sliding rod 52, a transverse anchor rod 53, a frost heave force sensing base 54 and a movable soil retaining device 55, wherein the L-shaped main pipe 51 is fixedly installed (welded) on the frost heave piercing mechanism mounting frame 11, and the L-shaped main pipe 51 includes a top curved pipe section 511 and a vertical straight pipe section 512, and the top curved pipe section 511 includes a transverse straight pipe section and a bent pipe section, and the bent pipe section of the top curved pipe section 511 is connected to the vertical straight pipe section 512 through a threaded seal, so that the top curved pipe section 511 and the vertical straight pipe section 512 are connected, and the inner diameter of the vertical straight pipe section 512 is larger than the inner diameter of the top curved pipe section 511.

[0035] Preferably, since the L-shaped main pipe 51 of the frost heave piercing mechanism 5 is L-shaped, a transverse blocking arm 111 is provided on the frost heave piercing mechanism mounting frame 11 (see FIG. Figure 3 ), so that the transverse straight pipe section of the top curved pipe section 511 of the L-shaped main pipe 51 is fixedly welded on the transverse blocking arm 111 to ensure the stability of the entire L-shaped main pipe 51.

[0036] The sliding rod 52 is vertically slidably installed in the vertical straight pipe section 512 of the L-shaped main pipe 51. Specifically, a mounting block 56 is fixedly installed inside the vertical straight pipe section 512 of the L-shaped main pipe 51. The sliding rod 52 is vertically slidably installed in the mounting block 56 and can slide up and down. A limiting plate 58 is also fixedly provided in the middle position of the sliding rod 52. A spring 57 is provided between the limiting plate 58 and the mounting block 56 to provide a downward elastic force for the sliding rod 52. A limiting protrusion 500 is provided inside the bottom end of the vertical straight pipe section 512 of the L-shaped main pipe 51 to limit the limiting plate 58 and prevent the limiting plate 58 from escaping from the L-shaped main pipe 51. A first piston 59 is provided at the top end of the sliding rod 52.

[0037] The transverse anchor rod 53 is slidably installed in the transverse straight pipe section of the top curved pipe section 511 of the L-shaped main pipe 51, and a sliding guide 532 is arranged at the tail of the transverse anchor rod 53 to ensure that the transverse anchor rod 53 can move stably in the transverse straight pipe section of the top curved pipe section 511 of the L-shaped main pipe 51 in the transverse direction, and a second piston 533 is also arranged on the tail side of the sliding guide 532; the interior of the L-shaped main pipe 51 between the first piston 59 and the second piston 533 is filled with hydraulic oil.

[0038] Through the above structure, when the sliding rod 52 moves vertically upward, the first piston 59 applies pressure to the hydraulic oil, and then the second piston 533 drives the transverse anchor rod 53 to be pushed out laterally along the transverse straight pipe section of the top curved pipe section 511 of the L-shaped main pipe 51. Then, the function to be achieved by the present invention is that when the pile foundation tube 1 is backfilled and buried, the transverse anchor rod 53 is inside the transverse straight pipe section of the top curved pipe section 511 of the L-shaped main pipe 51. After the backfilling and burying is completed, when the soil body freezes and heaves, the sliding rod 52 can be moved vertically upward under the action of the freeze heave, and then the transverse anchor rod 53 is driven to penetrate the soil body laterally outward, so that the pile foundation tube 1 is more stably anchored with the surrounding soil body, thereby effectively playing an anti-freeze pull effect. Therefore, the present invention sets a frost heave force sensing base 54 at the bottom end of the sliding rod 52, and sets a movable soil retaining device 55 between the frost heave force sensing base 54 and the vertical straight pipe section of the L-shaped main pipe 51. Specifically, the frost heave force sensing base 54 is used to sense the frost heave force of the soil body, and drive the sliding rod 52 to move upward under the frost heave force. Before frost heave occurs, the bottom end of the sliding rod 52 should extend out of the bottom of the vertical straight pipe section of the L-shaped main pipe 51 to reserve a movable margin for upward movement, and the area of ​​the frost heave force sensing base 54 should be large enough to be larger than the vertical straight pipe section of the L-shaped main pipe 51. The cross-sectional area of ​​the present invention is to fully receive the effect of frost heaving force. The frost heaving force sensing base 54 of the present invention includes a circular bottom plate 541, and a hemispherical structure 542 is designed on the bottom surface of the bottom plate 541, which helps it to fully receive the frost heaving force of the surrounding soil body and convert the frost heaving force into a vertical upward force, thereby pushing the sliding rod 52 to move upward; the function of the movable soil retaining device 55 is to avoid the frost heaving force sensing base 54 from being subjected to the downward frost heaving force of the soil body as much as possible, that is, to ensure that when frost heaving occurs, the frost heaving force sensing base 54 is only subjected to the upward frost heaving force. Through the movable soil retaining device 55, when backfilling the base soil, a movement space can be left between the frost heaving force sensing base 54 and the bottom of the vertical straight pipe section of the L-shaped main pipe 51. This space has no backfill soil and will not be subjected to the downward frost heaving force of the soil body. At the same time, the movable soil retaining device 55 will not hinder the upward movement of the frost heaving force sensing base 54.

[0039] Specifically, the movable soil retaining device 55 includes a top fixed cover 551 and an N-stage sliding sleeve. In this embodiment, a two-stage sliding sleeve (i.e., N=2) is adopted, namely, a first-stage sliding sleeve 552 and a second-stage sliding sleeve 553. The first-stage sliding sleeve 552 is vertically slidably installed in the top fixed cover 551 through a slideway 554, and the second-stage sliding sleeve 553 is vertically slidably installed in the first-stage sliding sleeve 552 through a slideway 554. The second-stage sliding sleeve 553 is fixedly sleeved on the frost heave force sensing base 54, and the top fixed cover 551 is fixedly sleeved on the bottom of the vertical straight pipe section of the L-shaped main pipe 51. In this way, when backfilling, the movable soil retaining device 55 can block the backfill soil, and when frost heave occurs, the movable soil retaining device 55 can also prevent the surrounding soil from exerting a downward force on the frost heave force sensing base 54, and the N-stage sliding sleeve can be vertically extended and retracted, so it will not hinder the upward movement of the frost heave force sensing base 54.

[0040] Furthermore, it should be noted that the function of the combined structure formed by the mounting block 56, the limit plate 58 and the spring 57 is to provide a downward elastic force for the sliding rod 52, so that the movable soil retaining device 55 can remain in the expanded state during the backfilling process; and when the soil frost heaves, the force of the frost heave is very large, which can enable the sliding rod 52 to overcome the elastic force of the spring and move upward.

[0041] Furthermore, it should be noted that, since the inner diameter of the vertical straight pipe section 512 is designed in the present invention to be larger than the inner diameter of the top curved pipe section 511, a smaller vertical upward displacement of the sliding rod 52 can achieve a larger lateral displacement of the lateral anchor rod 53, thereby ensuring that even when the frost heave deformation of the soil is small, the lateral anchor rod 53 can produce a larger lateral piercing displacement.

[0042] Furthermore, the front end of the transverse anchor rod 53 is a pointed structure, which is convenient for piercing the soil outward, and the transverse anchor rod 53 is also provided with a barb 531, which is convenient for stabilizing in the soil after piercing the soil. In addition, a limiting ring 534 is also provided at the front end of the transverse straight pipe section of the top curved pipe section 511 of the L-shaped main pipe 51, which is used to limit the extreme position of the transverse anchor rod 53 to be pushed outward, so as to prevent the transverse anchor rod 53 from falling out.

[0043] Furthermore, there are multiple frost heave piercing mechanisms 5 , which are evenly distributed on the wall of the pile foundation tube 1 in the circumferential direction.

[0044] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A supporting foundation structure suitable for frozen soil areas, characterized in that: It includes a pile foundation tube, a pile foundation tube top seat, a pile foundation tube base and a frost heave piercing mechanism; A pile foundation cylinder top seat is fixedly installed on the top of the pile foundation cylinder, and the pile foundation cylinder top seat is used to connect with the target to be supported; the pile foundation cylinder base is arranged at the bottom of the pile foundation cylinder, and a plurality of threaded drill rod assemblies are arranged on the pile foundation cylinder base for fixing with the foundation; The frost heave piercing mechanism is fixedly installed on the wall of the pile foundation tube, and the frost heave piercing mechanism includes: an L-shaped main pipe, a sliding rod, a transverse anchor rod, a frost heave force sensing base and a movable earth retaining device, wherein the L-shaped main pipe includes a top curved pipe section and a vertical straight pipe section, the top curved pipe section includes a transverse straight pipe section and a bent pipe section, the bent pipe section of the top curved pipe section is connected to the top of the vertical straight pipe section through a threaded seal, so that the top curved pipe section and the vertical straight pipe section are connected, and the inner diameter of the vertical straight pipe section is larger than the inner diameter of the top curved pipe section; A mounting block is fixedly arranged inside the vertical straight pipe section of the L-shaped main pipe, the sliding rod is vertically slidably installed in the mounting block, a limit plate is fixedly arranged at the middle position of the sliding rod, a spring is arranged between the limit plate and the mounting block, and a limit protrusion is arranged inside the bottom end of the vertical straight pipe section of the L-shaped main pipe for limiting the limit plate; a first piston is arranged at the top end of the sliding rod; the transverse anchor rod is slidably installed in the transverse straight pipe section of the top curved pipe section of the L-shaped main pipe, and a second piston is arranged at the tail of the transverse anchor rod; the L-shaped main pipe between the first piston and the second piston is filled with hydraulic oil; A frost heave force sensing base is arranged at the bottom end of the sliding rod, and a movable soil retaining device is arranged between the frost heave force sensing base and the vertical straight pipe section of the L-shaped main pipe.

2. The supporting foundation structure suitable for frozen soil areas according to claim 1, characterized in that: The base of the pile foundation cylinder is in the shape of an inverted cone.

3. The supporting foundation structure suitable for frozen soil areas according to claim 1, characterized in that: The threaded drill rod assembly includes a threaded barrel, a threaded drill rod and a protective cap. The threaded barrel is fixedly arranged on the base of the pile foundation barrel. The threaded drill rod is installed in the threaded barrel through threads. The threaded drill rod is used to drill into the foundation. The protective cap is installed on the top of the threaded drill rod.

4. The supporting foundation structure suitable for frozen soil areas according to claim 1, characterized in that: A frost heave piercing mechanism mounting frame is arranged on the cylinder wall of the pile foundation cylinder, and the frost heave piercing mechanism is fixed on the frost heave piercing mechanism mounting frame.

5. The supporting foundation structure suitable for frozen soil areas according to claim 4, characterized in that: A transverse retaining arm is arranged on the mounting frame of the frost heave piercing mechanism, and a transverse straight pipe section of the top curved pipe section of the L-shaped main pipe is fixedly welded on the transverse retaining arm.

6. The supporting foundation structure suitable for frozen soil areas according to claim 1, characterized in that: The movable earth retaining device includes a top fixed cover and N-level sliding sleeves, N is greater than or equal to 2, the top fixed cover is fixedly sleeved on the bottom of the vertical straight pipe section of the L-shaped main pipe, and the N-level sliding sleeves are slidably sleeved in sequence, wherein the uppermost sliding sleeve is vertically slidably installed in the top fixed cover, and the lowermost sliding sleeve is fixedly sleeved on the frost heave force sensing base.

7. The supporting foundation structure suitable for frozen soil areas according to claim 1, characterized in that: The front end of the transverse anchor rod is a tip structure.

8. The supporting foundation structure suitable for frozen soil areas according to claim 1, characterized in that: The transverse anchor rod is also provided with barbs.

9. The supporting foundation structure suitable for frozen soil areas according to claim 1, characterized in that: A limiting ring is also arranged at the front end of the transverse straight pipe section of the top curved pipe section of the L-shaped main pipe, which is used to limit the extreme position of the transverse anchor rod being ejected outward.

10. The supporting foundation structure suitable for frozen soil areas according to claim 1, characterized in that: There are multiple frost heave piercing mechanisms, which are evenly distributed on the wall of the pile foundation tube in the circumferential direction.

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