A support foundation structure suitable for use in permafrost regions

Abstract

The application provides a supporting foundation structure suitable for permafrost regions, which comprises a pile foundation cylinder, a pile foundation cylinder top base, a pile foundation cylinder bottom base and a frost heaving penetration mechanism, the top of the pile foundation cylinder is fixedly installed with the pile foundation cylinder top base, which is used for being connected with a target to be supported; the bottom of the pile foundation cylinder is provided with the pile foundation cylinder bottom base, a plurality of threaded drill rod assemblies are arranged on the pile foundation cylinder bottom base and are used for being fixed with a foundation; and the frost heaving penetration mechanism is fixedly installed on the cylinder wall of the pile foundation cylinder. When the soil body is subjected to frost heaving, under the action of the frost heaving, the transverse anchor rod of the frost heaving penetration mechanism can penetrate into the soil body transversely and outwardly, so that the pile foundation cylinder is anchored together with the surrounding soil body. In addition, since the inner diameter of the vertical straight pipe section of the frost heaving penetration mechanism is greater than the inner diameter of the top bent pipe section, even in the case that the frost heaving deformation of the soil body is small, the transverse anchor rod can also produce a larger transverse penetration displacement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation support foundation, in particular to a support foundation structure suitable for permafrost regions. BACKGROUND

[0002] Permafrost regions are also known as frozen earth, tundra or tundra. In physical geography, it refers to low temperature, short growing season, in geology, it refers to various rocks and soils below 0 DEG C and containing ice. Generally, it can be divided into short frozen soil, seasonal frozen soil and permafrost; frost heaving refers to the support foundation fixed in the frozen soil layer in the seasonal frozen soil or permafrost region, which is lifted up due to the action of tangential frost heaving force in cold season, and loses the fixing effect. In the warm season, the soil body falls back, and the uplifted support foundation is difficult to restore to its original position, thereby causing the uplift phenomenon. In view of this, a frost heaving prevention support foundation structure suitable for permafrost regions is needed.

[0003] At present, the existing frost heaving prevention support foundation structure needs to excavate a large area in the original foundation, and pour a large area of concrete to form a stable support foundation. However, the concrete often causes alkalization of the construction area, which affects the growth of surrounding vegetation, so this construction method will cause ecological damage to nature reserves. SUMMARY

[0004] The purpose of the present application is to solve the problems of the prior art, and to provide a support foundation structure suitable for permafrost regions.

[0005] In order to achieve the above purpose, the present application provides the following technical scheme:

[0006] A support foundation structure suitable for permafrost regions, comprising a pile foundation cylinder, a pile foundation cylinder top seat, a pile foundation cylinder bottom seat and a frost heaving penetration mechanism;

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

[0008] The frost heaving penetration mechanism is fixedly installed on the cylinder wall of the pile foundation cylinder, and the frost heaving penetration mechanism comprises an L-shaped main pipe, a sliding rod, a transverse anchor rod, a frost heaving force sensing base and a movable soil retaining device, wherein the L-shaped main pipe comprises a top bent pipe section and a vertical straight pipe section, the top bent pipe section comprises a transverse straight pipe section and a bent pipe section, the bent pipe section of the top bent pipe section is threadedly and sealingly connected with the top of the vertical straight pipe section, so that the top bent pipe section and the vertical straight pipe section are communicated, and the inner diameter of the vertical straight pipe section is greater than that of the top bent pipe section;

[0009] The installation block is fixedly arranged in the vertical straight pipe section of the L-shaped main pipe, the sliding rod is vertically and slidingly arranged in the installation block, a limiting plate is fixedly arranged at the middle position of the sliding rod, a spring is arranged between the limiting plate and the installation block, and a limiting protrusion is arranged at the bottom end of the vertical straight pipe section of the L-shaped main pipe, for limiting the limiting plate; a first piston is arranged at the top end of the sliding rod; the transverse anchor rod is slidingly arranged in the transverse straight pipe section of the top bent pipe section of the L-shaped main pipe, and the tail of the transverse anchor rod is provided with a second piston; and hydraulic oil is filled in the L-shaped main pipe between the first piston and the second piston.

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

[0011] In the technical scheme, the pile foundation cylinder base is in the shape of an inverted cone, and the inverted cone-shaped pile foundation cylinder base can make the foundation soil inside the foundation hole produce a downward compacting effect.

[0012] In the technical scheme, the threaded drill rod assembly comprises a threaded cylinder, a threaded drill rod and a protective cap, the threaded cylinder is fixedly arranged on the pile foundation cylinder base, the threaded drill rod is arranged in the threaded cylinder through threaded penetration, the threaded drill rod is used for drilling into the foundation, and the protective cap is arranged at the top of the threaded drill rod.

[0013] In the technical scheme, a frost heaving penetration mechanism mounting rack is arranged on the cylinder wall of the pile foundation cylinder, and the frost heaving penetration mechanism is fixed on the frost heaving penetration mechanism mounting rack.

[0014] In the technical scheme, a transverse blocking arm is arranged on the frost heaving penetration mechanism mounting rack, so that the transverse straight pipe section of the top bent pipe section of the L-shaped main pipe is fixedly welded on the transverse blocking arm.

[0015] In the technical scheme, the movable soil retaining device comprises a top fixed cover and N-stage 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-stage sliding sleeves are sequentially and slidingly sleeved, wherein the uppermost sliding sleeve is vertically and slidingly arranged in the top fixed cover, and the lowermost sliding sleeve is fixedly sleeved on the frost heaving force sensing base. In this way, the movable soil retaining device can block the backfill soil during backfilling, and can block the downward force of the surrounding soil on the frost heaving force sensing base when frost heaving occurs, and the multi-stage sliding sleeves can vertically stretch and shrink, so as not to hinder the upward movement of the frost heaving force sensing base.

[0016] In the technical scheme, the front end of the transverse anchor rod is in a pointed structure, facilitating penetration into the soil.

[0017] In the technical scheme, the transverse anchor rod is further provided with a barb, facilitating stable penetration into the soil.

[0018] In the above technical solution, a limiting ring is further arranged at the front end of the transverse straight pipe section of the top bent pipe section of the L-shaped main pipe, for limiting the limit position of the outward extrusion of the transverse anchor rod, preventing the transverse anchor rod from being pulled out.

[0019] In the above technical solution, the number of the frost heaving penetration mechanisms is multiple, and the frost heaving penetration mechanisms are uniformly distributed on the cylinder wall of the pile foundation cylinder in a circumferential direction.

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

[0021] 1. The support foundation structure of the present application is simple to construct, and during construction, a foundation hole is excavated, a threaded drill rod is installed, and then the foundation soil is backfilled, without the need to excavate a large area in the original foundation and pour concrete (concrete often causes alkalinization of the construction area, affecting the growth of surrounding vegetation), and is particularly suitable for natural protection areas in permafrost regions, avoiding ecological damage.

[0022] 2. The support foundation of the present application has a frost heaving penetration mechanism, and a frost heaving force sensing base is used to sense the frost heaving force of the soil, and under the action of the frost heaving force, the sliding rod is driven to move upward, and before frost heaving occurs, the bottom end of the sliding rod protrudes from the bottom of the vertical straight pipe section of the L-shaped main pipe, leaving a movement allowance for upward movement. When backfilling the foundation soil, the movement space between the frost heaving force sensing base and the bottom of the vertical straight pipe section of the L-shaped main pipe is left by the movable soil retaining device, which is not filled with soil and will not be subjected to the downward frost heaving force of the soil, and at the same time, the movable soil retaining device will not hinder the upward movement of the frost heaving force sensing base. After the backfilling is completed, when the soil undergoes frost heaving, the sliding rod moves vertically upward under the action of the frost heaving, and in turn drives the transverse anchor rod to penetrate transversely into the soil, so that the pile foundation cylinder is anchored together with the surrounding soil.

[0023] 3. The frost heaving penetration mechanism of the present application is designed with an inner diameter of the vertical straight pipe section being larger than that of the top bent pipe section, so that a smaller displacement of the vertical upward movement of the sliding rod can achieve a larger transverse displacement of the transverse anchor rod, so that even in the case of smaller deformation of the soil due to frost heaving, a larger transverse penetration displacement of the transverse anchor rod can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Figure 1 is a schematic view of the support foundation structure of the present application suitable for use in permafrost regions.

[0025] Figure 2 Figure 2 is a schematic view of the support foundation structure of the present application suitable for use in permafrost regions.

[0026] Figure 3 Figure 3 is an enlarged schematic view of A in Figure 1. Figure 2 Figure 4 is an enlarged schematic view of B in Figure 1.

[0027] Figure 4Structure diagram of the frost heaving piercing mechanism in the application (the transverse anchor rod is in the retracted state).

[0028] Figure 5 Structure diagram of the frost heaving piercing mechanism in the application (the transverse anchor rod is in the retracted state). DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be apparently and completely described in combination with the drawings of the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments of the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0030] As shown in the drawings, Figures 1-3 A support foundation structure suitable for permafrost regions comprises a pile foundation cylinder 1, a pile foundation cylinder top seat 2, a pile foundation cylinder bottom seat 3 and a frost heaving piercing mechanism 5.

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

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

[0033] The frost heaving piercing mechanism 5 is fixedly installed on the cylinder wall of the pile foundation cylinder 1. Preferably, a frost heaving piercing mechanism mounting rack 11 is arranged on the cylinder wall of the pile foundation cylinder 1, and the frost heaving piercing mechanism 5 is fixed on the frost heaving piercing mechanism mounting rack 11. Next, see the drawings, Figure 4 -Appendix Figure 5 The structure and working principle of the frost heaving piercing mechanism 5 are specifically introduced.

[0034] The frost heaving piercing mechanism 5 comprises an L-shaped main pipe 51, a sliding rod 52, a transverse anchor rod 53, a frost heaving 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 heaving piercing mechanism mounting frame 11, the L-shaped main pipe 51 comprises a top bent pipe section 511 and a vertical straight pipe section 512, the top bent pipe section 511 comprises a transverse straight pipe section and a bent pipe section, the bent pipe section of the top bent pipe section 511 is threadedly and sealingly connected with the vertical straight pipe section 512, so that the top bent pipe section 511 and the vertical straight pipe section 512 are in communication, and the inner diameter of the vertical straight pipe section 512 is greater than that of the top bent pipe section 511.

[0035] Preferably, since the L-shaped main pipe 51 of the frost heaving piercing mechanism 5 is L-shaped, a transverse blocking arm 111 (see FIG. 4) is arranged on the frost heaving piercing mechanism mounting frame 11, so that the transverse straight pipe section of the top bent pipe section 511 of the L-shaped main pipe 51 is fixedly welded on the transverse blocking arm 111, so as to ensure the stability of the entire L-shaped main pipe 51. Figure 3

[0036] The sliding rod 52 is vertically slidably installed in the vertical straight pipe section 512 of the L-shaped main pipe 51, specifically, an installation block 56 is fixedly arranged in the vertical straight pipe section 512 of the L-shaped main pipe 51, the sliding rod 52 is vertically slidably installed in the installation block 56 and can slide up and down, a limiting plate 58 is further fixedly arranged at the middle position of the sliding rod 52, a spring 57 is arranged between the limiting plate 58 and the installation block 56, so as to provide downward elastic force for the sliding rod 52, and a limiting protrusion 500 is arranged at the bottom end of the vertical straight pipe section 512 of the L-shaped main pipe 51, for limiting the limiting plate 58 and preventing the limiting plate 58 from coming out of the L-shaped main pipe 51; a first piston 59 is arranged 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 bent pipe section 511 of the L-shaped main pipe 51, the tail of the transverse anchor rod 53 is provided with a sliding guide 532, so as to ensure that the transverse anchor rod 53 can move stably in the transverse direction in the transverse straight pipe section of the top bent pipe section 511 of the L-shaped main pipe 51, and the tail side of the sliding guide 532 is further provided with a second piston 533; 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 exerts pressure on the hydraulic oil, and then the second piston 533 drives the transverse anchor rod 53 to move outward transversely along the transverse straight pipe section of the top bent pipe section 511 of the L-shaped main pipe 51. Then, the function to be achieved by the present application is that when the pile foundation cylinder 1 is backfilled, the transverse anchor rod 53 is inside the transverse straight pipe section of the top bent pipe section 511 of the L-shaped main pipe 51, and after backfilling is completed, when the soil body freezes and swells, under the action of freezing and swelling, the sliding rod 52 can move vertically upward, and then drive the transverse anchor rod 53 to penetrate into the soil body transversely and outwardly, so that the pile foundation cylinder 1 and the surrounding soil body are more stably anchored together, thereby effectively preventing frost heaving. Therefore, the present application is provided with a frost heaving force sensing base 54 at the bottom end of the sliding rod 52, and an active soil retaining device 55 is arranged between the frost heaving force sensing base 54 and the vertical straight pipe section of the L-shaped main pipe 51, specifically, the frost heaving force sensing base 54 is used to sense the frost heaving force of the soil body, and drive the sliding rod 52 to move upward under the action of the frost heaving force, before freezing and swelling occurs, the bottom end of the sliding rod 52 should protrude from the bottom of the vertical straight pipe section of the L-shaped main pipe 51 to reserve a movement allowance for upward movement, and the area of the frost heaving force sensing base 54 should be large enough, larger than the cross-sectional area of the vertical straight pipe section of the L-shaped main pipe 51, so as to fully receive the action of the frost heaving force, the frost heaving force sensing base 54 of the present application comprises a circular bottom plate 541, and a hemispherical structure 542 is designed on the bottom surface of the bottom plate 541, which helps to fully receive the frost heaving force of the surrounding soil body and convert the frost heaving force into vertical upward force, thereby pushing the sliding rod 52 to move upward; the active soil retaining device 55 functions to avoid the frost heaving force sensing base 54 from receiving the downward frost heaving force of the soil body as much as possible, that is, to ensure that the frost heaving force sensing base 54 only receives upward frost heaving force when freezing and swelling occurs. Through the active soil retaining device 55, 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 when backfilling the foundation soil, and this space is not filled with backfilling soil and will not receive the downward frost heaving force of the soil body, at the same time, the active soil retaining device 55 will not hinder the upward movement of the frost heaving force sensing base 54.

[0039] Specifically, the movable retaining device 55 comprises a top fixed cover 551 and N-stage sliding sleeves, in this embodiment, two-stage sliding sleeves are adopted (i.e. N=2), 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 sliding channel 554, the second-stage sliding sleeve 553 is vertically slidably installed in the first-stage sliding sleeve 552 through a sliding channel 554, and the second-stage sliding sleeve 553 is fixedly sleeved on the frost heaving 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, so that the movable retaining device 55 can block the backfilling soil during backfilling, and can also block the downward force of the surrounding soil on the frost heaving force sensing base 54 when frost heaving occurs, and the N-stage sliding sleeve can vertically expand and contract, so as not to hinder the upward movement of the frost heaving force sensing base 54.

[0040] Further, it needs to be explained that the combined structure formed by the mounting block 56, the limiting plate 58 and the spring 57 provides downward elastic force for the sliding rod 52, so that the movable retaining device 55 can be kept in an expanded state during the backfilling of the soil, and when the soil freezes and expands, the sliding rod 52 can move upward to overcome the elastic force of the spring.

[0041] Further, it needs to be explained that since the inner diameter of the vertical straight pipe section 512 is designed to be larger than the inner diameter of the top bent pipe section 511, a small displacement of the sliding rod 52 vertically moving upward can realize a larger lateral displacement of the lateral anchor rod 53, so as to ensure that the lateral anchor rod 53 can produce a larger lateral displacement even if the soil has a small frost heaving deformation.

[0042] Further, the front end of the lateral anchor rod 53 is a pointed structure, which is convenient for penetrating into the soil, and the lateral anchor rod 53 is further provided with a barb 531, which is convenient for being stably penetrated into the soil. In addition, a limiting ring 534 is arranged at the front end of the lateral straight pipe section of the top bent pipe section 511 of the L-shaped main pipe 51, which is used for limiting the limit position of the lateral anchor rod 53 outwardly protruding, so as to prevent the lateral anchor rod 53 from being pulled out.

[0043] Further, the number of the frost heaving penetrating mechanisms 5 is multiple, which are uniformly distributed on the wall of the pile foundation cylinder 1.

[0044] The above has made a detailed description of the present application in general, but some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, the modifications or improvements without departing from the spirit of the present application are within the protection scope of the present application.

Claims

1. A supporting foundation structure suitable for permafrost regions, characterized in that: Includes pile foundation tube, pile foundation tube top seat, pile foundation tube base, and frost heave insertion mechanism; A pile foundation cylinder top seat is fixedly installed on the top of the pile foundation cylinder, which is used to connect with the target to be supported; a pile foundation cylinder base is set at the bottom of the pile foundation cylinder, and multiple threaded drill rod assemblies are set on the pile foundation cylinder base for fixing to the foundation. The frost heave insertion mechanism is fixedly installed on the wall of the pile foundation cylinder. The frost heave insertion mechanism includes: an L-shaped main pipe, a sliding rod, a transverse anchor rod, a frost heave force sensing base, and a movable retaining device. 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 by a threaded seal, so that the top curved pipe section and the vertical straight pipe section are connected. The inner diameter of the vertical straight pipe section is larger than the inner diameter of the top curved pipe section. An installation block is fixedly installed inside the vertical straight pipe section of the L-shaped main pipe. The sliding rod is vertically slidably installed in the installation block. A limit plate is fixedly installed at the middle position of the sliding rod. A spring is installed between the limit plate and the installation block. A limit protrusion is installed inside the bottom end of the vertical straight pipe section of the L-shaped main pipe to limit the limit plate. A first piston is installed at the top end of the sliding rod. The transverse anchor is slidably installed in the transverse straight pipe section of the top bend of the L-shaped main pipe. A second piston is installed at the tail end of the transverse anchor. Hydraulic oil is filled inside the L-shaped main pipe between the first piston and the second piston. A frost heave sensing base is installed at the bottom of the sliding rod, and a movable retaining device is installed between the frost heave sensing base and the vertical straight pipe section of the L-shaped main pipe. The movable retaining device includes a top fixed cover and N-level sliding sleeves, where N is greater than or equal to 2. The top fixed cover is fixedly fitted at the bottom of the vertical straight pipe section of the L-shaped main pipe. The N-level sliding sleeves are slidably fitted in sequence. The uppermost sliding sleeve is vertically slidably installed inside the top fixed cover, and the lowermost sliding sleeve is fixedly fitted on the frost heave sensing base.

2. The supporting foundation structure suitable for permafrost regions according to claim 1, characterized in that: The base of the pile foundation tube is an inverted cone shape.

3. The supporting foundation structure suitable for permafrost regions according to claim 1, characterized in that: The threaded drill rod assembly includes a threaded cylinder, a threaded drill rod, and a protective cap. The threaded cylinder is fixedly mounted on the pile foundation cylinder base. The threaded drill rod is installed in the threaded cylinder through a thread. 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 permafrost regions according to claim 1, characterized in that: A frost heave insertion mechanism mounting frame is installed on the cylinder wall of the pile foundation tube, and the frost heave insertion mechanism is fixed on the frost heave insertion mechanism mounting frame.

5. The supporting foundation structure suitable for permafrost regions according to claim 4, characterized in that: A transverse stop arm is provided on the mounting bracket of the frost heave insertion mechanism, and the transverse straight pipe section of the top bend of the L-shaped main pipe is fixedly welded to the transverse stop arm.

6. The supporting foundation structure suitable for permafrost regions according to claim 1, characterized in that: The front end of the transverse anchor bolt has a pointed structure.

7. The supporting foundation structure suitable for permafrost regions according to claim 1, characterized in that: The horizontal anchor bolts are also equipped with barbs.

8. The supporting foundation structure suitable for permafrost regions according to claim 1, characterized in that: A limit ring is also installed at the front end of the transverse straight pipe section of the top bend of the L-shaped main pipe to limit the extreme position of the transverse anchor rod pushing outward.

9. The supporting foundation structure suitable for permafrost regions according to claim 1, characterized in that: The number of frost heave insertion mechanisms is multiple, and they are evenly distributed circumferentially on the cylinder wall of the pile foundation.

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