An intelligent foundation pit support pile system based on freezing construction method

Abstract

The present invention provides a foundation pit intelligent support pile system based on the freezing construction method. The device monitors the water level and deformation of the foundation pit in real time through relevant measuring instruments, and the computer intelligently controls the freezing thickness and hydraulic strength of the frozen piles based on the monitoring data, and then adjusts the thickness of the frozen soil curtain, the frozen soil size of the support pile end, and the length of the diagonal support pile, so as to achieve the purpose of monitoring and restoring the foundation pit deformation, improving the bearing capacity of the support structure, and preventing the foundation pit from seepage.

Description

Technical Field

[0001] The present invention relates to the field of freezing construction method and foundation pit support piles, and specifically to an intelligent foundation pit support pile system based on freezing construction method. Background Art

[0002] At present, foundation pit projects are developing in the direction of deep, dense, poor and frequent, that is, the excavation depth is getting deeper and deeper, the buildings around the foundation pit are getting denser and denser, and the engineering geological conditions and hydrogeological conditions are getting worse and worse. The main causes of accidents are: insufficient bearing capacity of foundation pit support bodies such as anchor rods and supporting piles; failure to dewater the foundation pit, pipe gushing at the foot of the slope or base uplift causing accidents; failure to monitor the foundation pit during construction, and failure to take timely measures to address foundation pit deformation, etc.

[0003] In foundation pit protection projects, foundation soils with poor integrity, such as water-containing silt, quicksand, and geological fracture zones, are difficult to protect. The soil frozen and reinforced by the freezing method has good integrity, and its mechanical properties such as compressive strength, shear strength and tensile strength are significantly improved, making it watertight. It has incomparable advantages in construction in water-rich layers, fractured rock formations or some unstable strata. If the freezing method can be effectively combined with the foundation pit support structure to improve the retaining capacity of the foundation pit support and make it have a good water-stopping effect, it will bring considerable practical application value to the foundation pit protection.

[0004] Based on this, the present invention proposes a new type of intelligent foundation pit support pile that can both freeze soil and bear loads. It is suitable for foundation pit protection with great depth and poor engineering and hydrogeological conditions, and has significant practical application significance. Summary of the invention

[0005] Purpose of the invention: In view of the problems existing in the prior art, the present invention provides an intelligent foundation pit support pile system based on the freezing construction method. The device monitors the water level and deformation of the foundation pit in real time through relevant measuring instruments, and the computer side intelligently controls the freezing thickness and hydraulic strength of the frozen piles based on the monitoring data, and then adjusts the thickness of the frozen soil curtain, the size of the frozen soil at the end of the support pile, and the length of the diagonal support pile, so as to achieve the purpose of monitoring and recovering the deformation of the foundation pit, improving the bearing capacity of the support structure, and preventing the seepage of the foundation pit.

[0006] The present invention is achieved through the following technical solutions:

[0007] A foundation pit intelligent support pile system based on a freezing construction method, comprising a freezing pile, a support monitoring group, a support regulation group, and a connection component. The support monitoring group is composed of various measuring instruments, which monitor the water level and deformation of the foundation pit and the thickness of frozen soil; the support regulation group is composed of a freezing intelligent control computer terminal, a freezing station, and hydraulic equipment. The freezing station and the hydraulic equipment are connected to the freezing pile through the connection component. The intelligent control computer terminal can intelligently regulate the freezing station and the hydraulic equipment based on monitoring data to adjust the freezing power and hydraulic strength of the freezing pile;

[0008] The freezing piles include long freezing piles, oblique freezing piles, freezing pipes, and supporting piles; the long freezing piles are arranged parallel to the supporting piles, the oblique freezing piles obliquely support the supporting piles, and the freezing pipes are arranged at the bottom of the supporting piles;

[0009] The support monitoring group is composed of a water level measuring tube, an earth pressure measuring tube, an inclinometer, and a temperature measuring tube; the water level measuring tube is arranged outside the long frozen pile to monitor the water level of the foundation pit, the earth pressure measuring tube is arranged between the supporting piles and the long frozen piles to monitor the pressure-bearing state of the supporting piles, the inclinometer is fixed on the supporting piles to measure the deflection angle of the supporting piles relative to the vertical direction, thereby reflecting the deformation of the foundation pit, and the temperature measuring tube is arranged around the frozen piles to measure the thickness of the frozen soil. The monitoring data of each measuring instrument are shared to the freezing intelligent control computer terminal;

[0010] Wherein, the connecting assembly includes an inlet branch pipe, an outflow branch pipe, a connecting pipe, a pipe placement rack, a brine inlet pipe, a brine outflow pipe, and a pipe connection component. The inlet branch pipe is connected to the brine inlet pipe through a connecting pipe, and the outflow branch pipe is connected to the brine outflow pipe through a connecting pipe; the pipes are connected through the pipe connection component, and the inlet branch pipe and the outflow branch pipe are connected to the inclined support freezing pile to circulate brine in the freezing pile, and the brine inlet pipe and the brine outflow pipe are placed on the pipe placement rack.

[0011] Specifically, the freezing pipe consists of an outflow pipe port, an inlet pipe port, and a freezing pipe. The freezing pipe is provided with an inner pipe partition wall to divide the pipe into an inlet pipe cavity and an outflow pipe cavity. The inlet pipe port is connected to the brine inlet pipe, and the outflow pipe port is connected to the brine outflow pipe.

[0012] Specifically, the diagonal brace frozen pile is composed of a square steel plate, a connecting pile section, a frozen pile section, and a diagonal brace frozen pile conversion head. The connecting pile section and the frozen pile section are pipe pile sections, which are connected by nesting and welding with the diagonal brace frozen pile conversion head. The square steel plate is welded to the end of the connecting pile section, the frozen pile section is buried in the foundation, and the square steel plate is cast together with the concrete beam to provide oblique support for the supporting pile row.

[0013] Specifically, the long freezing pile includes a pipe connecting pile, a tapered pipe pile, and a long freezing pile conversion head. The pipe connecting pile and the tapered pipe pile are welded and connected, and the long freezing pile conversion head is nested and welded on the pipe connecting pile.

[0014] Specifically, the diagonal brace freezing pile conversion head is a connecting head with transverse holes and longitudinal holes, and is composed of a pushing column, a nested column, an inner sleeve column, a flange square joint, and a flange round joint; the nested column is provided with transverse holes and longitudinal holes, and is connected to flange square joints on both sides and is provided with hydraulic holes, is connected to the inner sleeve column at the bottom, and the upper part is hollowed out from the inside, and can be embedded in the pushing column; the pushing column is provided with a supporting plate outside, and its width is the same as the thickness of the pipe wall of the subsequent pile section, that is, the subsequent pile section can be placed tightly between the pushing column and the protected nested column.

[0015] Specifically, a sealing rubber pad is first inserted before embedding the connecting pile section; the supporting plate is at a certain distance from the end of the pushing column. After the pushing column is embedded in the nested column, a hydraulic cavity is formed with the nested column. The hydraulic cavity is connected to the hydraulic equipment through the hydraulic hole, and hydraulic adjustment can be realized to change the embedding length of the connecting pile section.

[0016] Specifically, the long freezing pile conversion head is also provided with a transverse hole and a longitudinal hole, and is composed of a connecting column, an inner sleeve column, a flange square joint, and a flange round joint.

[0017] Specifically, a branch pipe channel is provided in the flange round joint, the flange square joint is connected to the flange round joint through a nut, and the branch pipe channel is tightly connected to the inlet branch pipe and the outlet branch pipe.

[0018] Specifically, a brine pipe is introduced into the pile through the diagonal brace freezing pile conversion head to realize brine circulation in the diagonal brace freezing pile. The brine pipe in the pile is connected to the incoming branch pipe through a pipe connecting component, and a pipe opening foot support is provided at the end of the brine pipe in the pile.

[0019] Compared with the prior art, the present invention has the following significant improvements:

[0020] A new type of freezing pile is proposed. In addition to bearing loads, it can also freeze the soil in the foundation pit to form a water-sealing curtain with adjustable thickness and adjustable length. A conversion head is set at the connection between the pipe pile sections, and a salt water circulation pipe is passed into the pipe pile to enable the salt water to flow in the pipe pile and then freeze the soil around the pile. Multiple freezing piles are driven side by side, and the frozen soil is connected to form a water-sealing curtain. The freezing thickness can be adjusted through the freezing station, thereby adjusting the thickness of the water-sealing curtain. The conversion head has a built-in hydraulic chamber, which can adjust the support length of the diagonal freezing pile.

[0021] The freezing construction method is used to improve the end bearing capacity and anti-seepage ability of the existing support structure. A freezing pipe is set at the bottom of the pile row, and the end of the pipe pile of the inclined braced pile row is a frozen pile section. After the soil around the pile is frozen, the integrity and mechanical strength of the soil at the bottom of the pile row and the end of the inclined braced frozen pile are significantly increased, thereby increasing the end bearing capacity of the support pile and the length of the anti-seepage path.

[0022] The water level and deformation of the foundation pit can be monitored and the supporting structure can be adjusted accordingly. The water level and deformation of the foundation pit can be monitored through water level measuring tubes, earth pressure measuring tubes and inclinometers. The monitoring data is fed into the computer terminal of the refrigeration intelligent control. The computer terminal can adjust the thickness of the water sealing curtain, the freezing scale of the soil at the end of the pile foundation and the length of the hydraulic diagonal brace according to the increase or decrease of the water level and the amplitude of the deformation, making the foundation pit support visible and controllable.

[0023] Reducing the size of the piles, reducing the amount of materials and construction, has a green and economical effect. When the submerged layer is relatively thick, the piles need to be driven in longer. The freezing method can greatly shorten the length of the piles, thus shortening the amount of pile construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 : A front view of the overall layout of a foundation pit intelligent support pile system based on the freezing construction method;

[0025] Figure 2 : Figure 1 AA section view;

[0026] Figure 3 : Front view of the cryotube;

[0027] Figure 4 : Top view of the cryotube;

[0028] Figure 5 : Figure 3 BB section view of the front view of the freezing tube;

[0029] Figure 6 : Figure 4 Top view HH cross-sectional view of the middle cryotube;

[0030] Figure 7 : Front view of the diagonal braced freezing pile;

[0031] Figure 8 : Top view of the diagonal braced freezing pile;

[0032] Fig. 9 : Figure 8 CC section view of the top view of the middle diagonal brace freezing pile;

[0033] Fig.10 : Front view of long freezing pile;

[0034] Fig.11: Top view of the long frozen pile;

[0035] Fig.12 : Fig.11 DD section view of the top view of the mid-length frozen pile;

[0036] Fig.13 : Front view of the diagonal brace freezing pile conversion head;

[0037] Fig.14 : Side view of the diagonal brace freezing pile conversion head;

[0038] Fig.15 : Top view of the diagonal brace freezing pile conversion head;

[0039] Fig.16 : Fig.13 EE section view of the front view of the middle diagonal brace freezing pile conversion head;

[0040] Fig.17 : Fig.14 FF section view of the top view of the middle diagonal brace freezing pile conversion head;

[0041] Fig.18 : Front view of the long freezing pile conversion head;

[0042] Fig.19 : Side view of the long freezing pile conversion head;

[0043] Fig. 20 : Top view of the long freezing pile conversion head;

[0044] Fig.21 : Fig. 20 GG section view of the top view of the medium-long freezing pile conversion head;

[0045] Fig. 22 : Front view of flange round joint;

[0046] Fig.23 : Side view of flange round joint;

[0047] Fig.24 : Front view of the brine pipe in the pile;

[0048] Fig.25 : Figure 1 A partial enlarged view of the

[0049] In the figure: 1. Support piles; 2. Earth pressure measuring pipe; 3. Concrete beam; 4. Oblique bracing frozen pile; 4-1. Square steel plate; 4-2. Connecting pile section; 4-3. Frozen pile section; 5. Inlet branch pipe; 5-1. Connecting pipe; 6. Outlet branch pipe; 7. Pipe placement rack; 7-1. Pipe placement bracket 7-1; 8. Temperature measuring pipe; 9. Frozen pipe; 9-1. Outlet pipe mouth; 9-2. Inlet pipe mouth; 9-3. Inlet pipe cavity; 9-4. Outlet pipe cavity; 9-5. Inner partition wall of pipe; 9-6. Frozen pipe; 10. Water level measuring pipe; 11. Long frozen pile; 11-1. Connecting pipe pile; 11-2. Conical pipe pile; 12. Salt Water flows into the pipeline; 13, salt water flows out of the pipeline; 14, long freezing pile conversion head; 14-1, connecting column; 15, diagonal freezing pile conversion head; 15-1, pushing column; 15-2, nested column; 15-3, inner sleeve column; 15-4, flange square joint; 15-5, transverse hole; 15-6, longitudinal hole; 15-7, hydraulic hole; 15-8, support plate; 15-9, sealing rubber pad; 16, flange round joint; 16-1, branch pipe channel; 16-2, screw interface; 16-3, nut; 17, salt water pipe in the pile; 17-1, pipe connection component; 17-2, pipe mouth foot support; 18, inclinometer. DETAILED DESCRIPTION

[0050] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0051] An intelligent foundation pit support pile system based on the freezing construction method is composed of freezing piles, a support monitoring group, a support regulation group, and a connection component. The support monitoring group is composed of various measuring instruments, which monitor the water level and deformation of the foundation pit and the thickness of frozen soil; the support regulation group is composed of a freezing intelligent control computer terminal, a freezing station, and hydraulic equipment. The freezing station and the hydraulic equipment are connected to the freezing piles through the connection component. The intelligent control computer terminal can intelligently regulate the freezing station and the hydraulic equipment based on the monitoring data, and adjust the freezing power and hydraulic strength of the freezing piles to achieve the above-mentioned invention purpose.

[0052] like Figure 1 , 2 As shown, specifically, the freezing piles include long freezing piles 11, inclined freezing piles 4, freezing pipes 9, and are used in combination with the supporting pile row 1; the long freezing piles 11 are arranged parallel to the supporting pile row 1, the inclined freezing piles 4 obliquely support the supporting pile row 1, and the freezing pipes 9 are arranged at the bottom of the supporting pile row 1.

[0053] like Figure 1 , 2As shown, specifically, the support monitoring group is composed of a water level measuring tube 10, an earth pressure measuring tube 2, an inclinometer 18, and a temperature measuring tube 8; the water level measuring tube 10 is arranged outside the long frozen pile 11 to monitor the water level of the foundation pit, and the earth pressure measuring tube 2 is arranged between the supporting pile row 1 and the long frozen pile 11 to monitor the pressure-bearing state of the supporting pile row 1. The inclinometer 18 is fixed on the supporting pile row 1 to measure the deflection angle of the supporting pile row 1 relative to the vertical direction, thereby reflecting the deformation of the foundation pit, and the temperature measuring tube 8 is arranged around the frozen pile 11 to measure the thickness of the frozen soil. The monitoring data of each measuring instrument are shared to the freezing intelligent control computer terminal.

[0054] like Figure 1 , 25 As shown, specifically, the connection assembly includes an inlet branch pipe 5, an outflow branch pipe 6, a connecting pipe 5-1, a pipe placement rack 7, a saline inlet pipe 12, a saline outflow pipe 13, and a pipe connection component 17-1. The inlet branch pipe 5 is connected to the saline inlet pipe 12 through the connecting pipe 5-1, and the outflow branch pipe 6 is connected to the saline outflow pipe 13 through the connecting pipe 5-1. The pipes are connected through the pipe connection component 17-1. The inlet branch pipe 5 and the outflow branch pipe 6 are connected to the diagonal brace freezing pile 4 to circulate the saline in the freezing pile. The saline inlet pipe 12 and the saline outflow pipe 13 are placed on the pipe placement rack 7 and the pipe placement bracket 7-1.

[0055] like Figure 3 , 4 As shown in Figures 5 and 6, specifically, the freezing pipe 9 is composed of an outflow pipe port 9-1, an inflow pipe port 9-2, and a freezing pipe 9-6. The freezing pipe 9-6 is provided with an inner pipe partition wall 9-5, which divides the pipe into an inflow pipe cavity 9-3 and an outflow pipe cavity 9-4. The inflow pipe port 9-2 is connected to a brine inflow pipe 12, and the outflow pipe port 9-1 is connected to a brine outflow pipe 13.

[0056] like Figure 7 , 8 As shown in Figure 9, specifically, the diagonal brace frozen pile 4 is composed of a square steel plate 4-1, a connecting pile section 4-2, a frozen pile section 4-3, and a diagonal brace frozen pile conversion head 15. The connecting pile section 4-2 and the frozen pile section 4-3 are pipe pile sections, which are connected by nesting and welding with the diagonal brace frozen pile conversion head 15. The square steel plate 4-1 is welded to the end of the connecting pile section 4-2, and the frozen pile section 4-3 is buried in the foundation. The square steel plate 4-1 is cast together with the concrete beam 3 to obliquely support the supporting pile row 1.

[0057] like Fig.10 , 11As shown in 12, specifically, the long freezing pile 11 includes a pipe connecting pile 11-1, a tapered pipe pile 11-2, and a long freezing pile conversion head 14. The pipe connecting pile 11-1 and the tapered pipe pile 11-2 are welded and connected, and the long freezing pile conversion head 14 is nested and welded on the pipe connecting pile 11-1.

[0058] like Fig. 9 , Figure 13-17 As shown, specifically, the diagonal brace freezing pile conversion head 15 is a connector with a transverse hole 15-5 and a longitudinal hole 15-6, and is composed of a pushing column 15-1, a nested column 15-2, an inner sleeve column 15-3, a flange square joint 15-4, and a flange round joint 16; the nested column 15-2 is provided with a transverse hole 15-5 and a longitudinal hole 15-6, and is connected to a flange square joint 15-4 on both sides and is provided with a hydraulic hole 15-7, and is connected to the inner sleeve column 15-3 at the bottom, and the upper part is hollowed out from the inside, and can be embedded in the pushing column 15-1; the pushing column 15-1 is provided with a supporting plate 15-8 outside, Its width is the same as the wall thickness of the connecting pile section 4-2, that is, the connecting pile section 4-2 can be placed tightly between the pushing column 15-1 and the protected nested column 15-2; to ensure the sealing effect, a sealing rubber pad 15-9 is first inserted before embedding the connecting pile section 4-2; the supporting plate 15-8 is at a certain distance from the end of the pushing column 15-1. After the pushing column 15-1 is embedded in the nested column 15-2, a hydraulic cavity is formed with the nested column 15-2. The hydraulic cavity is connected to the hydraulic equipment through the hydraulic hole 15-7, which can realize hydraulic adjustment and change the embedding length of the connecting pile section 4-2.

[0059] like Figure 18-21 As shown, specifically, the long freezing pile conversion head 14 is also provided with a transverse hole 15 - 5 and a longitudinal hole 15 - 6 , and is composed of a connecting column 14 - 1 , an inner sleeve column 15 - 3 , a flange square joint 15 - 4 , and a flange round joint 16 .

[0060] like Figure 7 , 8 As shown in , 22 and 23, specifically, a branch pipe channel 16-1 is provided in the flange round joint 16, the flange square joint 15-4 is connected to the flange round joint 16 through a nut 16-3, and the branch pipe channel 16-1 is tightly connected to the inlet branch pipe 5 and the outlet branch pipe 6.

[0061] like Fig. 9 , 24 As shown, specifically, a pile brine pipe 17 is introduced into the pile through the diagonal brace freezing pile conversion head 15 to realize the brine circulation in the pile of the diagonal brace freezing pile 4, and the same is true for the long freezing pile 11. The pile brine pipe 17 is connected to the incoming branch pipe 5 through a pipe connection component 17-1, and a pipe port foot support 17-2 is provided at the end of the pile brine pipe 17 to leave space for brine to flow out of the pile brine pipe 17.

[0062] The present invention also provides a method for using the above-mentioned inventive device, including the installation and construction of the device.

[0063] (I) Installation method of diagonal bracing freezing pile 4:

[0064] 1. After connecting the pipe connection member 17-1 to the end of the brine pipe 17, place it into the freezing pile section 4-3;

[0065] 2. Embed the diagonal brace freezing pile conversion head 15 at the end of the freezing pile section 4-3;

[0066] 3. Connect the incoming branch pipe 5 to the pipe connection member 17-1 through the transverse hole 15-5;

[0067] 4. Screw the flange square joint 15-4 and the flange round joint 16. One side of the flange square joint 15-4 passes through the inlet branch pipe 5, and the other side passes through the outlet branch pipe 6;

[0068] 5. The connection between the welding diagonal brace freezing pile conversion head 15 and the freezing pile section 4-3;

[0069] 6. After inserting the sealing rubber pad 15-9 on the supporting plate 15-8, the connecting pile section 4-2 can be placed tightly between the pushing column 15-1 and the protected nested column 15-2;

[0070] 7. Weld the square steel plate 4-1 to the end of the connecting pile section 4-2 to complete the installation.

[0071] (II) Installation method of long freezing pile 4:

[0072] 1. After connecting the pipe connection member 17-1 to the end of the salt water pipe 17, place it into the tapered pipe pile 11-2. If the length is not enough, connect the connecting pipe pile 11-1 to the tapered pipe pile 11-2 and then place the salt water pipe 17;

[0073] 2. Embed the long freezing pile conversion head 14 in the end of the tapered pipe pile 11-2. If the connecting pipe pile 11-1 is connected, embed it in the end of the connecting pipe pile 11-1;

[0074] 3. Connect the incoming branch pipe 5 to the pipe connection member 17-1 through the transverse hole 15-5;

[0075] 4. Screw the flange square joint 15-4 and the flange round joint 16. One side of the flange square joint 15-4 passes through the inlet branch pipe 5, and the other side passes through the outlet branch pipe 6;

[0076] 5. Weld the connection between the long freezing pile conversion head 14 and the tapered pipe pile 11-2 to complete the installation.

[0077] (III) The installation and construction steps of a foundation pit intelligent support pile system based on the freezing construction method are as follows:

[0078] 1. According to the design size of the foundation pit, support piles with a certain design depth at the edge of the foundation pit 1;

[0079] 2. Assemble the diagonal freezing pile 4 and the long freezing pile 11;

[0080] 3. Drive several long frozen piles 11 outside the supporting pile row 1;

[0081] 4. Insert the earth pressure measuring tube 2 between the supporting pile row 1 and the long freezing pile 11, insert the water level measuring tube 10 and the temperature measuring tube 8 outside the long freezing pile 11, and connect each monitoring instrument to the freezing intelligent control computer terminal;

[0082] 5. Connect the brine inlet pipe 12 and the brine outlet pipe 13 to the long freezing pile 11 through the connecting pipe 5-1. The brine inlet pipe 12 and the brine outlet pipe 13 are placed on the pipe placement rack 7 and connected to the freezing station;

[0083] 6. The freezing station is powered on to control the long freezing piles 11 to start freezing the soil around the piles. The thickness of the frozen soil is monitored through the temperature measuring tube until the soil frozen by several long freezing piles 11 is connected to form a water-sealing curtain of the required thickness;

[0084] 7. Excavate the foundation pit according to the designed depth;

[0085] 8. Fix the inclinometer 18 on the top of the supporting pile 1, insert the freezing pipe 9 at the bottom of the supporting pile 1, insert one end of the diagonal freezing pile 4 into the foundation pit, and cast the other end together with the concrete beam 3 on the upper inner side of the supporting pile 1;

[0086] 9. Connect the brine inlet pipe 12 and the brine outlet pipe 13 to the freezing pipe 9 and the inclined freezing pile 4. Place the brine inlet pipe 12 and the brine outlet pipe 13 on the pipe placement bracket 7-1 and connect them to the freezing station;

[0087] 10. Connect the hydraulic equipment to the hydraulic hole 15-7 on the diagonal bracing freezing pile conversion head 15, and press a certain amount of hydraulic pressure into the hydraulic hole 15-7 to prevent the connecting pile section 4-2 from being damaged by the supporting plate 15-8 due to the heavy load;

[0088] 11. Insert a temperature measuring tube near the freezing pipe 9 and the inclined freezing pile 4, and connect it to the freezing intelligent control computer terminal;

[0089] 12. The freezing station controls the freezing pipe 9 and the freezing pile section 4-3 to start freezing, and monitors the thickness of the frozen soil through the temperature measuring tube until the freezing pipe 9 is connected to the frozen soil of the freezing pile section 4-3, completing the arrangement of the foundation pit support;

[0090] 13. The computer terminal of the refrigeration intelligent control intelligently adjusts the freezing thickness and diagonal bracing length of the frozen piles based on the data of various measuring instruments.

[0091] (IV) The intelligent control process of the computer terminal of the refrigeration intelligent control is as follows:

[0092] 1. When the water level in the foundation pit increases, resulting in a higher water head in the foundation pit and increased soil pressure on the side of the supporting pile row 1, the freezing pipe 9, the diagonal braced freezing pile 11, and the long freezing pile 11 increase the freezing thickness, thereby increasing the thickness of the water-sealing curtain, the soil stiffness of the pile ends of the supporting pile row 1 and the diagonal braced freezing pile, and the anti-seepage width of the foundation pit bottom. The computer terminal of the freezing intelligent control can preset and monitor the thickness of the frozen soil;

[0093] 2. When the supporting pile row 1 tilts inward, the diagonal brace frozen pile conversion head 15 increases the hydraulic strength, reduces the embedded length of the connecting pile section 4-2, that is, increases the supporting length of the diagonal brace frozen pile 4, so as to restore the foundation pit deformation. When the tilt angle is close to 0°, stop pressurizing;

[0094] 3. When neither of the above two situations occurs, the freeze will be maintained.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A foundation pit intelligent support pile system based on a freezing construction method, comprising a freezing pile, a support monitoring group, a support regulation group, and a connection component. The support monitoring group is composed of various measuring instruments, which monitor the water level and deformation of the foundation pit and the thickness of frozen soil; the support regulation group is composed of a freezing intelligent control computer terminal, a freezing station, and a hydraulic device. The freezing station and the hydraulic device are connected to the freezing pile through the connection component. The intelligent control computer terminal can intelligently regulate the freezing station and the hydraulic device based on the monitoring data to adjust the freezing power and hydraulic strength of the freezing pile; in, The freezing piles comprise long freezing piles (11), diagonal freezing piles (4), freezing pipes (9), and supporting pile rows (1); the long freezing piles (11) are arranged parallel to the supporting pile rows (1), the diagonal freezing piles (4) diagonally support the supporting pile rows (1), and the freezing pipes (9) are arranged at the bottom of the supporting pile rows (1); The support monitoring group is composed of a water level measuring tube (10), an earth pressure measuring tube (2), an inclinometer (18), and a temperature measuring tube (8); the water level measuring tube (10) is arranged outside the long frozen pile (11) to monitor the water level of the foundation pit; the earth pressure measuring tube (2) is arranged between the supporting pile row (1) and the long frozen pile (11) to monitor the pressure-bearing state of the supporting pile row (1); the inclinometer (18) is fixed on the supporting pile row (1) to measure the deflection angle of the supporting pile row (1) relative to the vertical direction, thereby reflecting the deformation of the foundation pit; the temperature measuring tube (8) is arranged around the frozen pile (11) to measure the thickness of the frozen soil; and the monitoring data of each measuring instrument are shared to the freezing intelligent control computer terminal; The connection assembly comprises an inlet branch pipe (5), an outflow branch pipe (6), a connecting pipe (5-1), a pipe placement rack (7), a saline inlet pipe (12), a saline outflow pipe (13), and a pipe connection component (17-1); the inlet branch pipe (5) is connected to the saline inlet pipe (12) via the connecting pipe (5-1); the outflow branch pipe (6) is connected to the saline outflow pipe (13) via the connecting pipe (5-1); the pipes are connected via the pipe connection component (17-1); the inlet branch pipe (5) and the outflow branch pipe (6) are connected to the inclined braced freezing pile (4) to circulate saline in the freezing pile; the saline inlet pipe (12) and the saline outflow pipe (13) are placed on the pipe placement rack (7); The diagonal brace frozen pile (4) is composed of a square steel plate (4-1), a connecting pile section (4-2), a frozen pile section (4-3), and a diagonal brace frozen pile conversion head (15); the connecting pile section (4-2) and the frozen pile section (4-3) are pipe pile sections, which are connected by nesting and welding with the diagonal brace frozen pile conversion head (15); the square steel plate (4-1) is welded to the end of the connecting pile section (4-2); the frozen pile section (4-3) is buried in the foundation; the square steel plate (4-1) is cast together with the concrete beam (3) to obliquely support the supporting pile row (1); The diagonal brace freezing pile conversion head (15) is a connector with a transverse hole (15-5) and a longitudinal hole (15-6) therein, and is composed of a pushing column (15-1), a nested column (15-2), an inner sleeve column (15-3), a flange square joint (15-4), and a flange round joint (16); the nested column (15-2) is provided with a transverse hole (15-5) and a longitudinal hole (15-6) therein, is connected to flange square joints (15-4) on both sides and is provided with hydraulic holes (15-7), is connected to the inner sleeve column (15-3) at the bottom, and is hollowed out from the inside at the top and can be embedded in the pushing column (15-1); the pushing column (15-1) is provided with a supporting plate (15-8) outside, and its width is the same as the thickness of the pipe wall of the connecting pile section (4-2), that is, the connecting pile section (4-2) can be placed tightly between the pushing column (15-1) and the protected nested column (15-2); The connecting pile section (4-2) can be placed tightly between the pushing column (15-1) and the protected nesting column (15-2), and a sealing rubber pad (15-9) is first inserted before the connecting pile section (4-2) is embedded; the supporting plate (15-8) is at a certain distance from the end of the pushing column (15-1), and after the pushing column (15-1) is embedded in the nesting column (15-2), a hydraulic cavity is formed with the nesting column (15-2), and the hydraulic cavity is connected to the hydraulic equipment through the hydraulic hole (15-7), so that hydraulic adjustment can be realized to change the embedding length of the connecting pile section (4-2); A branch pipe channel (16-1) is provided in the flange round joint (16); the flange square joint (15-4) is connected to the flange round joint (16) via a nut (16-3); and the branch pipe channel (16-1) is tightly connected to the inlet branch pipe (5) and the outlet branch pipe (6); When the supporting pile row (1) tilts inward, the diagonal brace frozen pile conversion head (15) increases the hydraulic strength, reduces the embedded length of the connecting pile section (4-2), that is, increases the supporting length of the diagonal brace frozen pile (4), so as to restore the foundation pit deformation. When the tilt angle approaches 0°, the pressurization is stopped.

2. According to claim 1, a foundation pit intelligent support pile system based on the freezing construction method is characterized in that: The freezing pipe (9) is composed of an outflow pipe opening (9-1), an inflow pipe opening (9-2), and a freezing pipe (9-6); an inner pipe partition wall (9-5) is provided in the freezing pipe (9-6) to divide the pipe into an inflow pipe cavity (9-3) and an outflow pipe cavity (9-4); the inflow pipe opening (9-2) is connected to a saline inflow pipe (12), and the outflow pipe opening (9-1) is connected to a saline outflow pipe (13).

3. According to claim 1, the intelligent foundation pit support pile system based on the freezing construction method is characterized by: The long freezing pile (11) comprises a pipe connecting pile (11-1), a tapered pipe pile (11-2), and a long freezing pile conversion head (14); the pipe connecting pile (11-1) and the tapered pipe pile (11-2) are welded together, and the long freezing pile conversion head (14) is nested and welded on the pipe connecting pile (11-1).

4. According to claim 3, the intelligent foundation pit support pile system based on the freezing construction method is characterized in that: The long freezing pile conversion head (14) is provided with a transverse hole (15-5) and a longitudinal hole (15-6), and is composed of a connecting column (14-1), an inner sleeve column (15-3), a flange square joint (15-4), and a flange round joint (16).

5. According to the foundation pit intelligent support pile system based on the freezing construction method as described in claim 1, it is characterized by: A brine pipe (17) is introduced into the pile through the diagonal brace freezing pile conversion head (15) to realize brine circulation in the pile of the diagonal brace freezing pile (4); the brine pipe (17) is connected to the incoming branch pipe (5) through a pipe connection component (17-1); and a pipe opening foot support (17-2) is provided at the end of the brine pipe (17).

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