Pile foundation structure for preventing and treating hot karst lake erosion and construction method thereof

Abstract

The present application relates to a kind of pile foundation structure for preventing and treating hot karst lake erosion, including pile foundation passing through active layer and permafrost layer in turn, it is characterized in that: closely attached to the surface and around the pile foundation is provided with drainage device, the top of the pile foundation one side is equipped with power supply system and the control panel of protective cover; Capillary water transport layer is attached to the surface of the pile foundation in the active layer, one end of the capillary water transport layer is arranged in the inside of the drainage device, the other end is fixed by clamp through the active layer;Several drainage holes are annularly arranged on the upper end surface of the drainage device;The control panel is electrically connected with the power supply system.Simultaneously, the construction method of the pile foundation structure is also disclosed.The present application is simple in structure, and practical, isolates water and pile foundation direct contact, realizes the transfer of moisture in active layer, to realize the combination of prevention and treatment, reaches the effect of treating the symptoms and the root cause.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot karst lake erosion pile foundation disease prevention and treatment, and particularly relates to a pile foundation structure for preventing and treating hot karst lake erosion and a construction method thereof. BACKGROUND

[0002] Under the influence of external disturbance factors, the thickness of the active layer increases, the underground ice or ice-rich permafrost layer partially melts, and the surface soil layer subsides, and after water accumulation, a lake pond is formed, which is called a hot karst lake. In the circum-Arctic region and low-latitude mountainous areas, hot karst lakes are widely developed. Under the background of global climate warming, with the intensification of permafrost degradation, the number of hot karst lakes increases, and the area expands. The latest research data shows that there are more than 161,300 hot karst lakes developed in the Qinghai-Tibet Plateau region, with an area of more than 2,830 km 2 Under this situation, the infrastructure built in the permafrost region is inevitably affected by the hot karst lake, especially for the pile foundation structure of the highway or railway bridge, which is directly affected by the transverse expansion of the hot karst lake. The lake water erodes the pile for a long time, which will cause the pile foundation to be damaged and the bearing capacity to be reduced, and seriously affect the safety of highway or railway operation. Therefore, it is of great practical significance to carry out research on the prevention and treatment technology of hot karst lake erosion pile foundation diseases.

[0003] The transverse expansion of the hot karst lake will cause the underlying permafrost to melt, causing the pile foundation to sink, and at the same time, the lake water erosion will cause the pile foundation structure to corrode. At present, for the prevention and treatment of hot karst lake erosion pile foundation diseases, the cofferdam is mainly added around the pile foundation to prevent the lake water from contacting the pile. However, the cofferdam set around the pile can only prevent the direct contact of the surface lake water with the pile foundation, and cannot effectively isolate the water permeated around the pile foundation through the active layer.

[0004] In real engineering, there are still problems such as pile damage caused by lake water erosion and induced pile foundation bearing capacity reduction. Therefore, there is an urgent need for a pile foundation structure for preventing and treating hot karst lake erosion, which can efficiently realize lake water drainage and prevent the pile foundation structure from being eroded by lake water to ensure the safety of the superstructure on the pile foundation. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a pile foundation structure for preventing and treating hot karst lake erosion, which is simple in structure and high in practicality.

[0006] Another technical problem to be solved by the present application is to provide a construction method of the pile foundation structure for preventing and treating hot karst lake erosion.

[0007] In order to solve the above problems, the pile foundation structure for preventing and treating the erosion of hot karst lake, which comprises a pile foundation penetrating the active layer and the permafrost layer in sequence, characterized in that: a water collecting and draining device is arranged around the pile foundation close to the ground surface, and a power supply system and a control panel with a protective cover are arranged on one side of the top end of the pile foundation; a capillary water conveying layer is attached to the surface of the pile foundation in the active layer, one end of the capillary water conveying layer is arranged in the interior of the water collecting and draining device, and the other end penetrates the active layer and is fixed by a clamp; a plurality of drainage holes are arranged in a ring shape on the upper end surface of the water collecting and draining device; and the control panel is electrically connected with the power supply system.

[0008] The inner diameter of the water collecting and draining device is equal to the body diameter of the pile foundation.

[0009] The water collecting and draining device is a circular ring structure, comprising a Ш-shaped frame and an inclined surface connected together; one end of the inclined surface is connected with the side wall of the pile foundation, and the other end is connected with the top end I of the Ш-shaped frame; a plurality of drainage holes are arranged in a ring shape on the inclined surface; the control panel is arranged on the top of the pile foundation of the inclined surface; the top end II of the Ш-shaped frame is connected with the top outer edge of the capillary layer in the capillary water conveying layer; an atomizing pool is arranged in the inner chamber of the Ш-shaped frame, and a floating atomizer is arranged in the atomizing pool; one end of the floating atomizer is connected with a swing arm, and the swing arm is connected with a swing arm support fixed in the interior of the atomizing pool through a rotating shaft; a fan is arranged in the outer chamber of the atomizing pool, and the fan and the floating atomizer are connected with the control panel through power supply lines respectively.

[0010] The drainage hole is arranged on the inclined surface close to the top end I, and the diameter of the drainage hole is 5-8 cm.

[0011] The power supply system is arranged at a position 1-2 m below the top of the pile foundation, and is composed of a solar or wind power generation device.

[0012] The capillary water conveying layer is composed of a waterproof layer and a capillary layer in the shape of Г; the waterproof layer is composed of an inclined surface body and a vertical body connected as a whole; the top of the inclined surface body is sealingly connected with the inner surface of the inclined surface in the water collecting and draining device; the inner side of the vertical body is attached to the surface of the pile foundation, and the outer side is provided with the capillary layer; the bottom of the vertical body and the capillary layer is fixed by a clamp in the shape of ┛; the top of the capillary layer extends along the side wall of the atomizing pool to the atomizing pool of the water collecting and draining device.

[0013] The clamp is arranged at the junction of the active layer and the permafrost layer, and the inner diameter of the clamp is equal to the outer diameter of the pile foundation.

[0014] The construction method of the pile foundation structure for preventing and treating the erosion of hot karst lake as described above comprises the following steps:

[0015] 1. After the construction site is leveled, the design position of the pile foundation is determined in the site, the pile hole is excavated to the design elevation, and the thickness of the active layer is determined according to the survey data and the geological conditions during the pile hole excavation;

[0016] 2. The steel reinforcement cage binding operation is performed, the capillary water transport layer is laid in the section of the steel reinforcement cage penetrating the active layer, the capillary water transport layer is fixed at the active layer and the steel reinforcement cage by using the clamp, the power supply system support is pre-buried at the position 1-2 meters below the top of the pile foundation, the components of the water collecting and draining device are pre-buried and fixed at the position 0.5-0.8 meters above the junction of the steel reinforcement cage and the ground, and the steel reinforcement cage after the binding operation is completed is hoisted to the pile hole;

[0017] 3. After the steel reinforcement cage hoisting operation is completed, the concrete pouring is performed, and the capillary water transport layer is ensured to be in a taut state during pouring;

[0018] 4. According to the size of the pile foundation, the water collecting and draining device is pre-fabricated and assembled in the component factory, and then the assembled water collecting and draining device is hoisted and nested together with the pile foundation and fixed, the outer edge of the capillary layer is placed in the atomizing pool through the drainage hole, and the waterproof layer is sealingly connected with the inclined inner wall of the water collecting and draining device;

[0019] 5. The power supply system is fixedly installed on the pre-buried support, and the power supply system is connected with the control panel by using the power supply line;

[0020] 6. After all the components are installed, the entire system is debugged, and after the capillary layer and the atomizer are ensured to work normally, the construction is completed.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1. The waterproof layer attached to the side wall of the pile foundation isolates the direct contact between the water on the side of the pile in the active layer and the pile body, and at the same time, the capillary layer is used to migrate the water on the side of the pile to the water collecting and draining device, and then the liquid water is atomized by the floating atomizer and discharged into the atmospheric environment, effectively preventing the erosion of the hot karst lake water penetration to the pile foundation.

[0023] The overall size of the water collecting and draining device in the present application is greater than that of the pile basic body, and when the pile foundation occurs melting and sinking downward displacement, it can withstand shear force and can play a certain anti-melting and sinking role.

[0024] 3. The present application has the advantages of simple structure and strong practicability, realizes the transfer of water in the active layer, realizes the combination of prevention and treatment, and achieves the effect of treating the symptoms and the root cause. BRIEF DESCRIPTION OF DRAWINGS

[0025] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0026] Figure 1 The cross-sectional view of the pile foundation structure for preventing and treating the erosion of the hot karst lake in the present application.

[0027] Figure 2 It is a schematic diagram of the drainage device in the present invention.

[0028] Figure 3 Schematic diagram of the connection between the atomizing pool and the floating atomizer in the present invention.

[0029] Figure 4 This is an axonometric diagram of the pile foundation structure for preventing and controlling erosion of thermokarst lakes according to the present invention.

[0030] In the figure: 1-active layer, 2-permafrost layer, 3-pile foundation, 4-drainage device, 5-power supply system, 6-capillary water transport layer, 7-waterproof layer, 8-capillary layer, 9-clamp, 10-drainage hole, 11-power supply line, 12-atomization tank, 13-floating atomizer, 14-fan, 15-control panel, 16-swing arm, 17-rotating shaft, 18-swing arm bracket. DETAILED DESCRIPTION

[0031] like Figures 1-4 As shown, a pile foundation structure for preventing and controlling erosion in thermokarst lakes includes a pile foundation 3 that sequentially passes through an active layer 1 and a permafrost layer 2. A drainage system 4 is installed close to the ground surface and surrounds the pile foundation 3. A power supply system 5 and a control panel 15 with a protective cover are installed on one side of the top of the pile foundation 3. A capillary water transport layer 6 is attached to the surface of the pile foundation 3 within the active layer 1. One end of this capillary water transport layer 6 is located within the drainage system 4, and the other end passes through the active layer 1 and is secured by a clamp 9. A plurality of drainage holes 10 are arranged in a ring on the upper end surface of the drainage system 4. The control panel 15 is electrically connected to the power supply system 5.

[0032] The inner diameter of the drainage device 4 is equal to the main body diameter of the pile foundation 3 .

[0033] The drainage device 4 is a circular structure, including a Ш-shaped frame and a slope connected together; one end of the slope is connected to the side wall of the pile foundation 3, and the other end is connected to the top I of the Ш-shaped frame; a number of drainage holes 10 are arranged in a ring on the slope; a control panel 15 is provided on the pile foundation 3 at the top of the slope; the top II of the Ш-shaped frame is connected to the top outer edge of the capillary layer 8 in the capillary water transport layer 6; an atomization pool 12 is provided in the inner chamber of the Ш-shaped frame, and a floating atomizer 13 is provided in the atomization pool 12; one end of the floating atomizer 13 is connected to a swing arm 16, which is connected to a swing arm bracket 18 fixed inside the atomization pool 12 via a rotating shaft 17; a fan 14 is provided in the outer chamber of the atomization pool 12, and the fan 14 and the floating atomizer 13 are respectively connected to the control panel 15 via a power supply line 11.

[0034] A drainage hole 10 is provided on the inclined surface near the top end I. The diameter of the drainage hole 10 is 5 to 8 cm. The purpose is to facilitate the installation of the waterproof layer 7 and the capillary layer 8 through the drainage hole 10.

[0035] The power supply system 5 is arranged at the top of the pile foundation 3 and extends downward by 1-2 meters, which is composed of solar or wind power generation devices.

[0036] The capillary water transport layer 6 is composed of a waterproof layer 7 and a capillary layer 8 in the shape of Г; the waterproof layer 7 is composed of a slope body and a vertical body which are connected as a whole; the top of the slope body is in sealing connection with the inner surface of the slope in the water collecting and draining device 4; the inner side of the vertical body is attached to the surface of the pile foundation 3, and the outer side is provided with the capillary layer 8; the bottom of the vertical body and the capillary layer 8 is fixed by a clamp 9 in the shape of ┛; the top of the capillary layer 8 extends along the side wall of the atomizing pool 12 to the atomizing pool 12 of the water collecting and draining device 4.

[0037] The waterproof layer 7 is a PVC waterproof roll material with good ductility. The capillary layer 8 is a fiber cotton cloth with good water absorption capacity. The floating atomizer 13 is composed of a piezoelectric ceramic piece embedded in a ring-shaped plastic cavity, which is made by using the principle that the piezoelectric ceramic piece of the conventional humidifier core part can atomize liquid water.

[0038] The clamp 9 is made of annular stainless steel material and is arranged at the junction of the active layer 1 and the permafrost layer 2, and the inner diameter is equal to the outer diameter of the pile foundation 3.

[0039] The working principle of the present application is as follows:

[0040] The waterproof layer 7 arranged on the side of the pile separates the water from directly contacting the pile foundation 3, and the capillary layer 8 realizes the transfer of water in the active layer 1, thereby realizing the combination of "prevention" and "treatment" and achieving the effect of treating both the symptoms and the root cause. The specific working principle is as follows: when the hot karst lake located near the pile foundation 3 gradually expands, the lake water penetrates through the active layer 1 to contact the capillary water transport layer 6, the water in the active layer 1 is transferred upward to the atomizing pool 12 through the capillary layer 8; the floating atomizer 13 is always in contact with the water level in the atomizing pool 12, the control panel 15 sends instructions, and the power supply system 5 provides power for the floating atomizer 13, vaporizes the liquid water in the atomizing pool 12, and then discharges the water vapor with the help of the fan 14.

[0041] A construction method of a pile foundation structure for preventing and treating hot karst lake erosion, comprising the following steps:

[0042] (1) After leveling the construction site, the design position of the pile foundation 3 is determined in the site, the pile hole is excavated to the design elevation, and the thickness of the active layer 1 is determined according to the survey data and the geological conditions during the pile hole excavation;

[0043] (2) Steel reinforcement cage binding operation is carried out, the capillary water transport layer 6 is laid in the section of the steel reinforcement cage penetrating the active layer 1, the capillary water transport layer 6 is fixed at one end at the position where the active layer 1 and the steel reinforcement cage are at the same depth, the support of the power supply system 5 is pre-buried at the position of 1-2 meters downward from the top of the pile foundation 3, the components of the water collecting and draining device 4 are pre-buried and fixed at the position of 0.5-0.8 meters upward from the junction of the steel reinforcement cage and the ground surface, and the steel reinforcement cage after binding is hoisted to the pile hole;

[0044] (4) After the reinforcement cage is hoisted, the concrete is poured, and the capillary water transport layer 6 is ensured to be in a taut state during pouring;

[0045] (5) According to the size of the pile foundation 3, the drainage device 4 is prefabricated and assembled in the component factory, and then the assembled drainage device 4 is hoisted and nested with the pile foundation 3 and fixed, the outer edge of the capillary layer 8 is placed in the atomizing pool 12 through the drainage hole 10, and the waterproof layer 7 is sealingly connected with the inclined inner wall of the drainage device 4;

[0046] (6) The power supply system 5 is fixedly installed on the embedded support, and the power supply system 5 is connected with the control panel 15 by using the power supply wire 11;

[0047] (7) After all components are installed, the entire system is debugged, and after the capillary layer 8 and the atomizer 13 are ensured to work normally, the construction is completed.

Claims

1. A pile foundation structure for preventing and controlling erosion of a thermokarst lake, comprising a pile foundation (3) sequentially passing through an active layer (1) and a permafrost layer (2), characterized in that: A drainage device (4) is provided close to the ground surface and surrounding the pile foundation (3); a power supply system (5) and a control panel (15) with a protective cover are provided on one side of the top of the pile foundation (3); a capillary water transport layer (6) is attached to the surface of the pile foundation (3) in the movable layer (1); one end of the capillary water transport layer (6) is provided inside the drainage device (4), and the other end passes through the movable layer (1) and is fixed by a clamp (9); a plurality of drainage holes (10) are arranged in an annular pattern on the upper end surface of the drainage device (4); the control surface The plate (15) is electrically connected to the power supply system (5); the capillary water transport layer (6) is composed of a waterproof layer (7) and a capillary layer (8) in the shape of a Г; the waterproof layer (7) is composed of an inclined body and a vertical body connected as one body; the top of the inclined body is sealed with the inner surface of the inclined surface of the drainage device (4); the inner side of the vertical body is in contact with the surface of the pile foundation (3), and the outer side is provided with the capillary layer (8); the bottom of the vertical body and the capillary layer (8) are fixed by a clamp (9) in the shape of ┛; the top of the capillary layer (8) is sealed with a clamp (9) in the shape of a ┛. The drainage device (4) extends along the side wall of the atomizing pool (12) into the atomizing pool (12) of the drainage device (4); the drainage device (4) is a circular ring structure, comprising a Ш-shaped frame and an inclined plane connected together; one end of the inclined plane is connected to the side wall of the pile foundation (3), and the other end is connected to the top end I of the Ш-shaped frame; a plurality of drainage holes (10) are arranged in an annular pattern on the inclined plane; the pile foundation (3) at the top of the inclined plane is provided with the control panel (15); the top end II of the Ш-shaped frame is connected to the capillary layer in the capillary water transport layer (6) (8) are connected to the top outer edge; the inner chamber of the Ш-shaped frame is provided with an atomizing pool (12), and the atomizing pool (12) is provided with a floating atomizer (13); one end of the floating atomizer (13) is connected to a swing arm (16), and the swing arm (16) is connected to a swing arm bracket (18) fixed inside the atomizing pool (12) through a rotating shaft (17); the outer chamber of the atomizing pool (12) is provided with a fan (14), and the fan (14) and the floating atomizer (13) are respectively connected to the control panel (15) through a power supply line (11).

2. The pile foundation structure for preventing and controlling erosion of a thermokarst lake according to claim 1, characterized in that: The inner diameter of the drainage device (4) is equal to the body diameter of the pile foundation (3).

3. The pile foundation structure for preventing and controlling erosion of a thermokarst lake according to claim 1, characterized in that: The drainage hole (10) is provided on the inclined surface adjacent to the top end I, and the diameter of the drainage hole (10) is 5 to 8 centimeters.

4. The pile foundation structure for preventing and controlling erosion of a thermokarst lake according to claim 1, characterized in that: The power supply system (5) is located 1 to 2 meters below the top of the pile foundation (3) and is composed of a solar or wind power generation device.

5. The pile foundation structure for preventing and controlling erosion of a thermokarst lake according to claim 1, characterized in that: The clamp (9) is provided at the junction of the active layer (1) and the permafrost layer (2), and its inner diameter is equal to the outer diameter of the pile foundation (3).

6. The method for constructing a pile foundation structure for preventing and controlling erosion of a thermokarst lake according to claim 1, comprising the following steps: (1) After leveling the construction site, determine the design position of the pile foundation (3) within the site, excavate the pile hole to the design elevation, and determine the thickness of the active layer (1) based on the survey data and the geological conditions at the time of pile hole excavation; (2) Carry out steel cage binding operation, lay capillary water transmission layer (6) in the section where the steel cage passes through the active layer (1), fix one end of the capillary water transmission layer (6) with a clamp (9) at the same depth as the active layer (1) and the steel cage, pre-embed the power supply system (5) bracket 1 to 2 meters below the top of the pile foundation (3), pre-embed the components of the fixed drainage device (4) 0.5 to 0.8 meters above the junction of the steel cage and the ground surface, and hoist the bound steel cage into the pile hole; (3) After the steel cage hoisting operation is completed, concrete pouring is carried out, and during pouring, the capillary water transmission layer (6) is ensured to be in a taut state; (4) Prefabricate and assemble the drainage device (4) in a component factory according to the size of the pile foundation (3), then hoist the assembled drainage device (4) and nest it with the pile foundation (3) and fix it, place the outer edge of the capillary layer (8) in the atomization pool (12) through the drainage hole (10), and seal the waterproof layer (7) with the inner wall of the inclined surface of the drainage device (4); (5) The power supply system (5) is fixedly mounted on the pre-buried bracket, and the power supply system (5) is connected to the control panel (15) using the power supply line (11); (6) After all components are installed, debug the entire system to ensure that the capillary layer (8) and the floating atomizer (13) are working properly, and then complete the construction.

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