Deep foundation pit supporting structure based on intelligent monitoring and self-adaptive adjustment and construction method

Abstract

The invention discloses a deep foundation pit supporting structure based on intelligent monitoring and self-adaptive adjustment and a construction method, and relates to the field of foundation pit supporting structures.The deep foundation pit supporting structure comprises steel sheet piles, a supporting lifting assembly is arranged at the tops of the middles of the multiple steel sheet piles, the supporting lifting assembly comprises supporting columns, and the multiple supporting columns are installed in the middles of the multiple steel sheet piles; according to the steel sheet pile supporting device, the telescopic length of the output end of the oil hydraulic cylinder is controlled through an external controller, so that the pressure between the steel sheet pile supporting steel frames is always kept within a safe pressure range, instability of steel sheet piles is avoided, and the stability of the steel sheet piles is improved. The construction safety and stability of the deep foundation pit are guaranteed, a triangle is formed among the connecting rods connected through the threaded sleeves, the I-shaped steel and the supporting columns, and the supporting stability of the whole foundation pit is further enhanced through the stability of the triangle.

Description

Technical Field

[0001] The present invention relates to the field of foundation pit support structures, and in particular to a deep foundation pit support structure and a construction method based on intelligent monitoring and adaptive adjustment. Background Art

[0002] A deep foundation pit refers to an engineering project with an excavation depth exceeding 5 meters (including 5 meters), or a project with a depth of less than 5 meters but with particularly complex geological conditions, surrounding environment and underground pipelines. Steel sheet pile support structures are widely used in the foundation pit excavation construction process. They have the advantages of fast construction, good support performance, low cost, and recyclability. They can achieve rapid support of the air surface of the foundation pit excavation.

[0003] In the Chinese patent with application number 202221953991.1 and titled “A Deep Foundation Pit Support Structure”, the setting of the patented connection mechanism prevents the protective cover from being deformed due to external force impact, so as to better protect the deep pit. However, the patent cannot be adaptively adjusted according to the external pressure on the foundation pit. When supporting the foundation pit, the existing steel sheet pile support structure often deforms into the pit or even becomes unstable due to many environmental influences during the excavation process. The existing steel sheet pile support structure has a fixed length and cannot be adjusted according to the pressure on the steel sheet pile. After the steel sheet pile is deformed, it cannot effectively support the foundation pit, and the support effect is poor. Summary of the invention

[0004] The present invention provides a deep foundation pit support structure and a construction method based on intelligent monitoring and adaptive adjustment, which can effectively solve the problem that the patent in the above-mentioned background technology cannot be adaptively adjusted according to the external pressure on the foundation pit, and the existing steel sheet pile support structure is often affected by many environments during the excavation of the foundation pit, causing the steel sheet piles to deform into the pit or even become unstable, and the existing steel sheet pile support structure has a fixed length and cannot be adjusted according to the pressure on the steel sheet piles. After the steel sheet piles are deformed, they cannot effectively support the foundation pit, resulting in poor support effect.

[0005] To achieve the above object, the present invention provides the following technical solutions: A deep foundation pit support structure based on intelligent monitoring and adaptive adjustment, comprising steel sheet piles, a plurality of steel sheet piles having a support lifting assembly disposed at the middle top, the support lifting assembly comprising a support column; A number of support columns are installed among several of the steel sheet piles. Connection plates are welded to both ends of the support columns. One end of adjacent support columns is connected by a connection plate and a fixing bolt. An assembly head is connected to the other end of adjacent support columns by a connection plate and a fixing bolt. An oil pressure cylinder is connected to the top of the assembly head. The top end of the output end of the oil pressure cylinder is connected to a fixing block through a pressure sensor. A support steel frame is connected to the top of the fixing block. A number of limiting ears are welded at equal intervals on one side of the support steel frame. The limiting ears are in contact with adjacent steel sheet piles; Two semi-circular docking frames are connected by fixing bolts on the outer sides of two mutually contacting connection plates. Semi-circular docking plates are welded to both ends of the semi-circular docking frames. An I-shaped steel is connected by fixing bolts between opposite semi-circular docking plates. Two adjusting sliders are installed on both sides of the I-shaped steel. A rotating seat is welded to one side of the adjusting slider. Rotating seats are also welded in the middle of both sides of the support column. A rotating flat head is rotatably installed inside the rotating seat. A docking threaded cylinder is welded to one end of the rotating flat head. One end of a connecting rod is connected inside the docking threaded cylinder. Connecting threads are provided at both ends of the connecting rod. One end of adjacent two connecting rods is connected to a threaded sleeve through the connecting thread on the outer side;

[0006] According to the above technical solution, a disassembly hole is penetrated through the top of the fixing block. A U-shaped frame is welded in the middle of the other side of the support steel frame. The fixing block is embedded inside the adjacent U-shaped frame. The U-shaped frame and the adjacent fixing block are connected by a disassembly pin. The disassembly pin penetrates through the U-shaped frame and the disassembly hole.

[0007] According to the above technical solution, a support frame is fixed by fixing bolts on one side of the support steel frame close to the limiting ear. Two adjusting sliding rods are welded to the top of the support frame. A support block is slidably connected between adjacent two adjusting sliding rods. An adjusting screw is rotatably installed in the middle of the top of the support frame between adjacent two adjusting sliding rods. The support block is connected to the adjusting screw through a threaded hole.

[0008] According to the above technical solution, the outer side of the fixing block is in close contact with the inner side of the U-shaped frame. The contact surfaces between the adjusting sliding rods and the support block are all smooth surfaces.

[0009] According to the above technical solution, wire pipe grooves are provided at both the top and the bottom of the support steel frame. Fixing ports are penetrated through both ends of the support steel frame. A fixing frame is fixed inside the fixing ports by fixing bolts.

[0010] According to the above technical solution, a bidirectional screw is rotatably installed on both sides of the I-shaped steel. A limiting sliding rod is installed at the bottom of the bidirectional screw. Both ends of the bidirectional screw and the adjacent limiting sliding rod are respectively connected to two adjusting sliders. The bidirectional screw is connected to the adjusting slider through a thread. The limiting sliding rod is slidably connected to the adjusting slider; One end of the bidirectional screw is connected with a driven bevel gear. On both sides of the top of the I-beam, driving bevel gears are rotatably installed near the driven bevel gear. The driven bevel gear meshes with the driving bevel gear. The top of the rotating shaft of the driving bevel gear is connected with an adjusting head.

[0011] According to the above technical solution, the input end of the pressure sensor is electrically connected to the output end of the external controller, the input end of the oil cylinder is electrically connected to the output end of the external controller, and the input end of the external controller is electrically connected to the output end of the external power supply.

[0012] According to the above technical solution, a support and protection component is arranged at the middle bottom of several sheet piles. The support and protection component includes a ground nail seat; The bottom of the support column is installed with a ground nail seat. Support ground nails are installed at the four corners of the bottom of the ground nail seat. A jack is installed at the top of the ground nail seat. Support plates are installed on both sides of the top of the jack. A number of positioning holes are evenly and equidistantly arranged on the outer side of the support plate. A lifting frame is sleeved on the outer sides of two adjacent support plates. An arc-shaped plate is welded to the top of the lifting frame. The top of the arc-shaped plate is attached to the bottom of the support column. A docking plate is welded to the bottom of the lifting frame. Docking holes are opened at both ends of the docking plate. A positioning pin is embedded in the docking hole and the adjacent positioning hole; A tightening hole is opened at the top of the sheet pile. A rotating pull rod is embedded in the tightening hole. A limiting plate is welded to one end of the rotating pull rod. A tightening thread is opened at the other end of the rotating pull rod. A tightening cylinder is connected to the outside of the tightening thread. One end of the tightening cylinder is connected to one end of the tightening pull rod. The other end of the tightening pull rod is connected to a fixed ear through a转接座. A tightening ground nail is embedded in the fixed ear.

[0013] According to the above technical solution, the present invention also provides a construction method for a deep foundation pit support structure based on intelligent monitoring and adaptive adjustment, including the following steps: S1. Preparation and protection process: First, use a pile driver to vertically drive multiple sheet piles into the soil in sequence. Insert the rotating pull rods into the tightening holes at equal intervals. Rotate the rotating pull rods to connect the tightening cylinder with the rotating pull rods through the tightening threads. After connection, place the fixed ears on the soil surface, and then insert the tightening ground nails into the soil; S2. Support assembly process: Use connecting discs and fixing bolts to connect multiple support columns one by one, connect the semi-circular docking frames with the corresponding connecting discs, connect the assembly heads to both ends of the connected support columns, connect the oil cylinders with the assembly heads, and then use disassembly pins to fixedly connect the fixed blocks with the U-shaped frames; S3. Support installation process: The assembled support steel frame is placed parallel inside the foundation pit area, aligning the limit ear on one side of the support steel frame with one side of the steel sheet pile. Rotate the adjusting screw to drive the support block to move along the adjusting slide rod, so that the support block abuts against one side of the adjacent steel sheet pile. Connect the oil pipe used for the oil cylinder to the oil cylinder, and connect the cable used for the pressure sensor to the pressure sensor; S4. Support strengthening process: Connect the I-beam and the semi-circular docking plate with fixing bolts. Connect one end of the corresponding connecting rod to the docking threaded barrel on the support column and the adjusting slider. Connect two adjacent connecting rods by rotating the rotating flat head in cooperation with the threaded sleeve; S5. Support and protection process: Place the ground nail seat at the bottom of the foundation pit. Move the support plate, insert the support column into the middle of the support plates on both sides of the top of the ground nail seat. Lift the lifting frame, insert the positioning pin into the corresponding docking hole and positioning hole. Fix the ground nail seat at the bottom of the foundation pit with support ground nails, and appropriately adjust the jack so that the top of the arc plate fits against the bottom of the support column.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. There is a support lifting component, which aligns the limit ear on one side of the support steel frame with one side of the steel sheet pile. Under the limiting action of the limit ear, the rapid fixed installation of the support steel frame is realized. The steel sheet pile limits the support steel frame, and when the support steel frame is subjected to lateral external force, it will not move, ensuring the support stability of the foundation pit. By rotating the adjusting screw to drive the support block to move, the support block abuts against one side of the adjacent steel sheet pile, and together with the support of the limit ear on the steel sheet pile, all the steel sheet piles can be effectively supported, strengthening the support stability of the foundation pit; Control the operation of the oil cylinder through the controller. The support steel frame presses against the corresponding steel sheet pile. Under the action of the mutual force, it supports the side wall of the foundation pit. Each pressure sensor real-time feeds back the pressure data to the external controller. When the pressure on the steel sheet pile changes, control the telescopic length of the output end of the oil cylinder through the external controller, so that the pressure between the steel sheet pile and the support steel frame always remains within a safe pressure range, preventing the steel sheet pile from deforming and avoiding the instability of the steel sheet pile, ensuring the safety and stability of the deep foundation pit construction. The fixing block and the C-shaped frame can be quickly and fixedly connected by using the disassembly pin, which is convenient for fixing the support steel frame and is convenient and fast to assemble; Connect two adjacent connecting rods by rotating the rotating flat head in cooperation with the threaded sleeve. The connecting rod connected by the threaded sleeve forms a triangle with the I-beam and the support column. Utilizing the stability of the triangle and the support of the I-beam, the compressive strength of the I-beam and the support column is higher, further strengthening the support stability of the overall foundation pit. Adjust the position of the adjusting slider by rotating the bidirectional screw, and by adding corresponding connecting rods and threaded sleeves, connect multiple connecting rods. The device can be flexibly adjusted according to the size of the foundation pit, with a wide range of applications.

[0015] 2. A support and protection component is provided. After the steel sheet pile is driven, the rotating rod is inserted into the tightening hole at equal intervals. The limit plate is located inside the steel sheet pile so that the limit plate fits the steel sheet pile. The rotating rod is rotated, and the tightening tube is connected to the rotating rod through the tightening thread. After the connection, the fixing ear is placed on the ground surface, and then the tightening ground nail is inserted into the ground. When the soil inside the steel sheet pile is subsequently excavated, the tightening ground nail can fix the top of the steel sheet pile under the connection between the rotating rod and the tightening rod. When the foundation pit is subsequently excavated, the connection between the steel sheet piles is better, and the steel sheet piles will not deviate and become unstable, thereby ensuring construction safety. After the excavation of the foundation pit is completed, the support column is embedded in the middle of the support plates on both sides of the top of the ground nail seat, the lifting frame is lifted, the positioning pins are inserted into the corresponding docking holes and positioning holes, and the ground nail seat is fixed to the bottom of the foundation pit with the supporting ground nails. The jack is adjusted appropriately to make the top of the arc plate fit with the bottom of the support column. The arc plate supports the support column, which strengthens the support stability of the support column, prevents the support column from falling, and fully ensures the construction safety.

[0016] In summary, the support and lifting assembly uses hydraulic cylinders to adaptively adjust the pressure between the sheet pile support steel frames, ensuring the safety of subsequent construction. The support and protection assembly can ensure the stability of the steel sheet piles in the initial stage of excavation. After excavation, the support stability in the support and lifting assembly is guaranteed. The two components cooperate with each other to fully ensure the safety of the overall construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0018] In the attached picture: Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the support and lifting assembly of the present invention; Figure 3 It is a schematic diagram of the installation structure of the support column of the present invention; Figure 4 It is a schematic diagram of the installation structure of the hydraulic cylinder of the present invention; Figure 5 It is a schematic diagram of the installation structure of the supporting steel frame of the present invention; Figure 6 It is a schematic diagram of the installation structure of the support block of the present invention; Figure 7 It is a schematic diagram of the installation structure of the connecting rod of the present invention; Figure 8 The present invention comes from Figure 7 A magnified image of area A; Fig. 9 It is a structural schematic diagram of the support and protection assembly of the present invention; Fig.10 It is a schematic diagram of the installation structure of the curved plate of the present invention; Fig.11 It is a schematic diagram of the installation structure of the tightening pull rod of the present invention; Fig.12 It is a structural schematic diagram of the construction method of the present invention; Numbers in the figure: 1, steel sheet pile; 2. Support lifting assembly; 201. Support column; 202. Connecting plate; 203. Assembly head; 204. Hydraulic cylinder; 205. Pressure sensor; 206. Fixing block; 207. Disassembly hole; 208. Support steel frame; 209. Frame; 210. Disassembly pin; 211. Support frame; 212. Adjustment slide bar; 213. Support block; 214. Adjustment screw; 215. Limiting ear; 216. Wire tube groove; 217. Fixing Fixed mouth; 218, fixed frame; 219, semicircular docking frame; 220, semicircular docking plate; 221, I-shaped steel; 222, bidirectional screw; 223, limit slide; 224, driven bevel gear; 225, driving bevel gear; 226, adjustment head; 227, adjustment slide; 228, rotating seat; 229, rotating flat head; 230, docking threaded barrel; 231, connecting rod; 232, connecting thread; 233, threaded sleeve; 3. Support and protection components; 301. Ground nail seat; 302. Support ground nail; 303. Support plate; 304. Positioning hole; 305. Lifting frame; 306. Arc plate; 307. Docking plate; 308. Docking hole; 309. Positioning pin; 310. Tightening hole; 311. Rotating rod; 312. Limiting plate; 313. Tightening thread; 314. Tightening cylinder; 315. Tightening rod; 316. Adapter seat; 317. Fixing ear; 318. Tightening ground nail; 319. Jack. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0020] Example: Figure 1-11As shown in the figure, the present invention provides a technical solution for a deep foundation pit support structure based on intelligent monitoring and adaptive adjustment, including a steel sheet pile 1. At the top of the middle of several steel sheet piles 1, a support lifting component 2 is provided. The support lifting component 2 includes a support column 201, a connection disk 202, a fitting head 203, an oil cylinder 204, a pressure sensor 205, a fixing block 206, a disassembly hole 207, a support steel frame 208, a U-shaped frame 209, a disassembly pin 210, a support frame 211, an adjustment slide bar 212, a support block 213, an adjustment screw 214, a limit ear 215, a wire pipe groove 216, a fixing port 217, a fixing frame 218, a semi-circular docking frame 219, a semi-circular docking disk 220, an I-beam 221, a bidirectional screw 222, a limit slide bar 223, a driven bevel gear 224, a driving bevel gear 225, an adjustment head 226, an adjustment slider 227, a rotating seat 228, a rotating flat head 229, a docking threaded cylinder 230, a connecting rod 231, a connecting thread 232, and a threaded sleeve 233; A number of support columns 201 are installed in the middle of several steel sheet piles 1. Connection disks 202 are welded at both ends of the support columns 201. One end of adjacent support columns 201 is connected by the connection disk 202 and a fixing bolt. The other end of adjacent support columns 201 is connected with a fitting head 203 through the connection disk 202 and a fixing bolt. The top end of the fitting head 203 is connected with an oil cylinder 204. The top end of the output end of the oil cylinder 204 is connected with a fixing block 206 through a pressure sensor 205. The top end of the fixing block 206 is connected with a support steel frame 208. The input end of the pressure sensor 205 is electrically connected with the output end of an external controller. The input end of the oil cylinder 204 is electrically connected with the output end of the external controller. The input end of the external controller is electrically connected with the output end of an external power supply. The pressure sensor 205 can detect the pressure received by the steel sheet pile 1. The pressure sensor 205 feeds back the pressure data to the external controller. The external controller determines the feedback data and controls the telescopic length of the output end of the corresponding oil cylinder 204, so as to change the pressure applied to the steel sheet pile 1; A disassembly hole 207 is opened through the top of the fixing block 206. A U-shaped frame 209 is welded in the middle of the other side of the support steel frame 208. The fixing block 206 is embedded inside the adjacent U-shaped frame 209. The U-shaped frame 209 and the adjacent fixing block 206 are connected by a disassembly pin 210. The disassembly pin 210 penetrates through the U-shaped frame 209 and the disassembly hole 207. The disassembly pin 210 can fix the U-shaped frame 209 and the fixing block 206, which is convenient for the installation and disassembly of the support steel frame 208. The outer side of the fixing block 206 is closely attached to the inner side of the U-shaped frame 209, making the connection between the fixing block 206 and the U-shaped frame 209 more stable. A number of limit ears 215 are welded at equal intervals on one side of the support steel frame 208. The limit ears 215 are attached to the adjacent steel sheet pile 1; A support frame 211 is fixed to one side of the support steel frame 208 near the limiting ear 215 through a fixing bolt, and two adjusting slide bars 212 are welded on the top of the support frame 211, and a support block 213 is slidably connected between two adjacent adjusting slide bars 212. The contact surfaces between the adjusting slide bar 212 and the support block 213 are smooth surfaces, so that the friction resistance between the adjusting slide bar 212 and the support block 213 is reduced, and the top of the support frame 211 is located between the two adjacent adjusting slide bars 212 and an adjusting screw 214 is rotatably installed, and the support block 213 and the adjusting screw 214 are connected through a threaded hole. Rotating the adjusting screw 214 can drive the support block 213 to move along the adjusting slide bar 212, and the support block 213 can resist the adjacent steel sheet piles 1, and cooperate with the limiting ear 215 to support the steel sheet piles 1, so that all the steel sheet piles 1 can be effectively supported; The top and bottom of the support steel frame 208 are provided with wire pipe grooves 216, and fixing openings 217 are provided through both ends of the support steel frame 208. A fixing frame 218 is fixed inside the fixing opening 217 by fixing bolts. The oil pipe connected to the hydraulic cylinder 204 and the cable connected to the pressure sensor 205 can be placed inside the wire pipe groove 216. The oil pipe and the cable are fixed by the fixing frame 218, so that the oil pipe and the cable can be placed regularly to avoid the oil pipe and the cable being scattered and hindering the construction. Two semicircular docking frames 219 are connected to the outer sides of the two mutually fitting connection plates 202 by fixing bolts, and semicircular docking frames 219 are welded with semicircular docking plates 220 at both ends, and I-shaped steels 221 are connected between the opposite semicircular docking plates 220 by fixing bolts, and two adjusting sliders 227 are installed on both sides of the I-shaped steel 221, and two-way screws 222 are rotatably installed on both sides of the I-shaped steel 221, and a limiting slide bar 223 is installed at the bottom of the two-way screw 222, and the two ends of the two-way screw 222 and the adjacent limiting slide bar 223 are respectively connected to the two adjusting sliders 227, and the two-way screw 222 and the adjusting slider 227 are connected by threads, and the limiting slide bar 223 and the adjusting slider 227 are slidably connected. Under the limiting action of the limiting slide bar 223, rotating the two-way screw 222 can drive the adjusting slider 227 to move along the limiting slide bar 223; One end of the bidirectional screw 222 is connected to a driven bevel gear 224, and driving bevel gears 225 are rotatably installed on both sides of the top of the I-shaped steel 221 near the driven bevel gear 224. The driven bevel gear 224 is meshed with the driving bevel gear 225, and an adjusting head 226 is connected to the top of the rotating shaft of the driving bevel gear 225. Rotating the adjusting head 226 with a wrench can drive the driven bevel gear 224 and the driving bevel gear 225 to rotate, thereby driving the bidirectional screw 222 to rotate, so as to facilitate the adjustment of the position of the adjusting slider 227; A rotating seat 228 is welded on one side of the adjusting slider 227, and a rotating seat 228 is also welded in the middle of both sides of the support column 201. A rotating flat head 229 is rotatably installed inside the rotating seat 228, and a docking threaded barrel 230 is welded on one end of the rotating flat head 229. The docking threaded barrel 230 is internally connected to one end of a connecting rod 231. Both ends of the connecting rod 231 are provided with connecting threads 232. The outer sides of one end of two adjacent connecting rods 231 are connected to threaded sleeves 233 through the connecting threads 232. A supporting and protecting assembly 3 is arranged at the middle bottom of a plurality of steel sheet piles 1, and the supporting and protecting assembly 3 includes a ground nail seat 301, a supporting ground nail 302, a supporting plate 303, a positioning hole 304, a lifting frame 305, an arc plate 306, a docking plate 307, a docking hole 308, a positioning pin 309, a tightening hole 310, a rotating pull rod 311, a limiting plate 312, a tightening thread 313, a tightening cylinder 314, a tightening pull rod 315, an adapter seat 316, a fixing ear 317, a tightening ground nail 318 and a jack 319; A ground nail seat 301 is installed at the bottom of the support column 201, and supporting ground nails 302 are installed at the four corners of the bottom of the ground nail seat 301. A jack 319 is installed on the top of the ground nail seat 301. Support plates 303 are installed on both sides of the top of the jack 319. A plurality of positioning holes 304 are evenly spaced on the outside of the support plate 303. A lifting frame 305 is sleeved on the outside of two adjacent support plates 303. An arc plate 306 is welded on the top of the lifting frame 305. The top of the arc plate 306 fits the bottom of the support column 201. The lifting frame 305 is welded on the top of the arc plate 306. The top of the arc plate 306 is in contact with the bottom of the support column 201. A docking plate 307 is welded at the bottom of 05, and docking holes 308 are opened at both ends of the docking plate 307. Positioning pins 309 are embedded in the docking holes 308 and the adjacent positioning holes 304. The positioning pins 309 can position the position of the arc plate 306. The positioning pins 309 are moved out of the positioning holes 304 and the docking holes 308, and the lifting frame 305 can be lifted and lowered along the support plate 303, and then the positioning pins 309 are inserted into the corresponding positioning holes 304 and the docking holes 308, so as to facilitate the change of the position of the arc plate 306; A tightening hole 310 is provided at the top of the steel sheet pile 1, and a rotating pull rod 311 is embedded in the tightening hole 310. A limiting plate 312 is welded to one end of the rotating pull rod 311, and a tightening thread 313 is provided at the other end of the rotating pull rod 311. A tightening cylinder 314 is connected to the outside of the tightening thread 313. One end of the tightening cylinder 314 is connected to one end of the tightening pull rod 315. The other end of the tightening pull rod 315 is connected to a fixing ear 317 through an adapter seat 316, and a tightening ground nail 318 is embedded in the fixing ear 317.

[0021] like Fig.12 As shown, the present invention also provides a construction method of a deep foundation pit support structure based on intelligent monitoring and adaptive adjustment, comprising the following steps: S1. Preliminary protection process: First, use a pile driver to vertically drive multiple steel sheet piles 1 into the ground in sequence. Insert the rotating tie rods 311 at equal intervals into the tightening holes 310. Rotate the rotating tie rods 311, and connect the tightening cylinder 314 to the rotating tie rods 311 through the tightening threads 313. After connection, place the fixed ears 317 on the ground surface, and then insert the tightening ground nails 318 into the ground. S2. Support assembly process: Use the connecting plates 202 and fixing bolts to connect multiple support columns 201 one by one, connect the semi-circular docking frames 219 to the corresponding connecting plates 202, connect the assembly heads 203 to both ends of the connected support columns 201, connect the hydraulic cylinders 204 to the assembly heads 203, and then use the disassembly pins 210 to fixedly connect the fixed blocks 206 to the U-shaped frames 209. S3. Support installation process: Place the assembled support steel frame 208 horizontally inside the foundation pit area, align the limit ears 215 on one side of the support steel frame 208 with one side of the steel sheet pile 1. Rotate the adjusting screw 214 to drive the support block 213 to move along the adjusting slide rod 212, so that the support block 213 abuts against one side of the adjacent steel sheet pile 1. Connect the oil pipe used by the hydraulic cylinder 204 to the hydraulic cylinder 204, and connect the cable used by the pressure sensor 205 to the pressure sensor 205. S4. Support strengthening process: Use fixing bolts to connect the I-beam 221 to the semi-circular docking plate 220. Connect one end of the corresponding connecting rod 231 to the docking threaded cylinders 230 on the support column 201 and the adjusting slider 227. Connect two adjacent connecting rods 231 by rotating the rotating flat head 229 in cooperation with the threaded sleeve 233. S5. Support protection process: Place the ground nail seat 301 at the bottom of the foundation pit. Move the support plate 303, embed the support column 201 between the two support plates 303 at the top of the ground nail seat 301. Lift the lifting frame 305, insert the positioning pins 309 into the corresponding docking holes 308 and positioning holes 304. Fix the ground nail seat 301 at the bottom of the foundation pit with the support ground nails 302, and appropriately adjust the jack 319 so that the top of the arc plate 306 fits against the bottom of the support column 201.

[0022] Working principle and usage process of the present invention: When excavating a foundation pit, first use a pile driver to vertically drive multiple steel sheet piles 1 into the ground in sequence. The tightening holes 310 at the top of the steel sheet piles 1 are higher than the ground surface. Finally, the steel sheet piles 1 are surrounded into a rectangle. After all the steel sheet piles 1 are driven, insert the rotating pull rods 311 at equal intervals into the tightening holes 310. The limiting plates 312 are located inside the steel sheet piles 1, making the limiting plates 312 fit with the steel sheet piles 1. Rotate the rotating pull rods 311, and connect the tightening cylinder 314 with the rotating pull rods 311 through the tightening threads 313. After connection, place the fixing ears 317 on the ground surface, and then insert the tightening ground nails 318 into the ground. When excavating the soil inside the steel sheet piles 1 subsequently, under the connection action of the rotating pull rods 311 and the tightening pull rods 315, the tightening ground nails 318 can fix the top of the steel sheet piles 1. When excavating the foundation pit subsequently, the steel sheet piles 1 will not shift, making the connection tightness between the steel sheet piles 1 better; Connect multiple support columns 201 one by one according to the width of the foundation pit by using the connection discs 202 and fixing bolts, so that the connected support columns 201 are suitable for the width of the excavated foundation pit, and connect the semi-circular docking frames 219 with the corresponding connection discs 202. After the connection of the support columns 201 is completed, connect the assembly heads 203 with both ends of the connected support columns 201, and connect the hydraulic cylinders 204 with the assembly heads 203. Then, use the disassembly pins 210 to fixedly connect the fixing blocks 206 with the U-shaped frames 209. At this time, the support steel frame 208 is fixedly connected with the output end of the hydraulic cylinder 204, completing the connection and assembly of the support steel frame 208; Use an excavator to gradually remove the soil inside the rectangular area surrounded by the steel sheet piles 1. When a part of the soil inside the foundation pit area is removed, use a crane to hoist the connected support columns 201 one by one and place the assembled support steel frame 208 parallel inside the foundation pit area, making the limiting ears 215 on one side of the support steel frame 208 dock with one side of the steel sheet piles 1. Under the limiting action of the limiting ears 215, the rapid fixed installation of the support steel frame 208 is realized. At the same time, the steel sheet piles 1 limit the support steel frame 208, and when the support steel frame 208 is subjected to a lateral external force, it will not move, ensuring the support stability of the foundation pit. Subsequently, use an electric wrench to rotate the adjusting screw 214 to drive the support block 213 to move along the adjusting slide rod 212, so that the support block 213 abuts against one side of the adjacent steel sheet pile 1, cooperating with the support of the limiting ears 215 on the steel sheet piles 1, enabling all the steel sheet piles 1 to be effectively supported and strengthening the support stability of the foundation pit; The oil pipe used by the hydraulic cylinder 204 is connected to the hydraulic cylinder 204, the cable used by the pressure sensor 205 is connected to the pressure sensor 205, the oil pipe and the cable are placed inside the wire pipe groove 216, and the oil pipe and the cable are fixed by the fixing frame 218, so that the oil pipe and the cable can be placed regularly to prevent the oil pipe and the cable from being scattered and hindering the subsequent construction. When all the supporting steel frames 208, oil pipes and cables located at the top of the foundation pit are installed, the controller controls the operation of the hydraulic cylinder 204, the output end of the hydraulic cylinder 204 is extended, and the supporting steel frame 208 squeezes the corresponding steel sheet pile 1. Under the interaction of forces, the support column 201 can be fixed and suspended inside the foundation pit, and can support the side wall of the foundation pit. Each pressure sensor 205 feeds back the pressure data to the external controller in real time. The external controller controls the hydraulic cylinder 204 to keep the pressure between the steel sheet pile 1 and the supporting steel frame 208 always within a safe pressure range to prevent the steel sheet pile 1 from being deformed, thereby ensuring the safety and stability of the deep foundation pit construction. Subsequently, the I-shaped steel 221 is connected to the semicircular docking plate 220 by using fixing bolts. After the connection of the I-shaped steel 221 is completed, one end of the corresponding connecting rod 231 is connected to the supporting column 201 and the docking threaded tube 230 on the adjusting slider 227. The two adjacent connecting rods 231 are connected by rotating the flat head 229 in cooperation with the threaded sleeve 233. The connection of the I-shaped steel 221 strengthens the connection stability between each connecting supporting column 201. The connecting rod 231 connected by the threaded sleeve 233 forms a triangle with the I-shaped steel 221 and the supporting column 201. The stability of the triangle makes the I-shaped steel 221 and the supporting column 201 more compressive, and further strengthens the support stability of the foundation pit. When the width of the foundation pit is wide, the number of interconnected support columns 201 is large, and the length of the connecting rods 231 on both sides of the I-shaped steel 221 is not long enough to be connected through the threaded sleeves 233, the adjusting head 226 is rotated by an electric wrench, and the bidirectional screw 222 is driven to rotate under the connection and driving action of the driven bevel gear 224 and the driving bevel gear 225, so as to adjust the position of the adjusting slider 227. By adding corresponding connecting rods 231 and threaded sleeves 233, multiple connecting rods 231 are connected, and the device can be flexibly adjusted according to the size of the foundation pit, and has a wide range of applications; The assembly head 203 can be connected to the semicircular docking plate 220, the semicircular docking plates 220 located at both ends of the foundation pit are connected to the hydraulic cylinder 204, the hydraulic cylinder 204 is connected to the supporting steel frame 208, and the hydraulic cylinders 204 at both ends of the foundation pit drive the supporting steel frame 208 to apply pressure to the steel sheet piles 1 at both ends of the foundation pit to ensure the support stability of the entire foundation pit; When the foundation pit excavation is completed, the ground nail seat 301 is placed at the bottom of the foundation pit, the support plate 303 is moved, and the support column 201 is embedded in the middle of the support plates 303 on both sides of the top of the ground nail seat 301, and the lifting frame 305 is lifted. The positioning pin 309 is inserted into the corresponding docking hole 308 and the positioning hole 304, and the ground nail seat 301 is fixed to the bottom of the foundation pit with the supporting ground nail 302, and the jack 319 is adjusted appropriately to make the top of the arc plate 306 fit with the bottom of the support column 201. The arc plate 306 supports the support column 201, thereby enhancing the supporting stability of the support column 201, preventing the support column 201 from falling, and fully ensuring the construction safety.

[0023] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A deep foundation pit support structure based on intelligent monitoring and adaptive adjustment, comprising a steel sheet pile (1), characterized in that: A support and lifting component (2) is arranged at the top in the middle of several of the steel sheet piles (1), and the support and lifting component (2) includes a support column (201). Several support columns (201) are installed in the middle of several of the steel sheet piles (1). Connection plates (202) are welded to both ends of the support column (201). One ends of adjacent support columns (201) are connected by the connection plate (202) and fixing bolts. The other ends of adjacent support columns (201) are connected with an assembly head (203) through the connection plate (202) and fixing bolts. An oil cylinder (204) is connected to the top of the assembly head (203). The top end of the output end of the oil cylinder (204) is connected with a fixing block (206) through a pressure sensor (205). A support steel frame (208) is connected to the top of the fixing block (206). A plurality of limiting ears (215) are welded at equal intervals on one side of the support steel frame (208), and the limiting ears (215) are in contact with the adjacent steel sheet pile (1). Two semi-circular docking frames (219) are connected by fixing bolts on the outer sides of the two mutually contacting connection plates (202). Semi-circular docking plates (220) are welded to both ends of the semi-circular docking frame (219). An I-beam (221) is connected by fixing bolts between the opposite semi-circular docking plates (220). Two adjusting sliders (227) are installed on both sides of the I-beam (221). A rotating seat (228) is welded to one side of the adjusting slider (227). Rotating seats (228) are also welded in the middle of both sides of the support column (201). A rotating flat head (229) is rotatably installed inside the rotating seat (228). A docking threaded cylinder (230) is welded to one end of the rotating flat head (229). One end of a connecting rod (231) is connected inside the docking threaded cylinder (230). Threaded connections (232) are opened at both ends of the connecting rod (231). One ends of adjacent two connecting rods (231) are connected with a threaded sleeve (233) through the threaded connection (232).

2. The deep foundation pit support structure based on intelligent monitoring and adaptive adjustment according to claim 1 is characterized in that: A disassembly hole (207) is formed through the top of the fixing block (206). A U-shaped frame (209) is welded in the middle of the other side of the support steel frame (208). The fixing block (206) is embedded inside the adjacent U-shaped frame (209). The U-shaped frame (209) and the adjacent fixing block (206) are connected by a disassembly pin (210), and the disassembly pin (210) penetrates through the U-shaped frame (209) and the disassembly hole (207).

3. The deep foundation pit support structure based on intelligent monitoring and adaptive adjustment according to claim 2 is characterized in that: A support frame (211) is fixed by fixing bolts on one side of the support steel frame (208) close to the limiting ear (215). Two adjusting sliding rods (212) are welded to the top of the support frame (211). A support block (213) is slidably connected between adjacent two adjusting sliding rods (212). An adjusting screw (214) is rotatably installed in the middle of the top of the support frame (211) between adjacent two adjusting sliding rods (212). The support block (213) is connected with the adjusting screw (214) through a threaded hole.

4. The deep foundation pit support structure based on intelligent monitoring and adaptive adjustment according to claim 3 is characterized in that: The outer side of the fixing block (206) is tightly fitted with the inner side of the shaped frame (209), and the contact surfaces between the adjusting slide rod (212) and the supporting block (213) are both smooth surfaces.

5. The deep foundation pit support structure based on intelligent monitoring and adaptive adjustment according to claim 1 is characterized in that: The top and bottom of the support steel frame (208) are both provided with wire pipe grooves (216), and fixing openings (217) are provided through both ends of the support steel frame (208), and a fixing frame (218) is fixed inside the fixing opening (217) by fixing bolts.

6. The deep foundation pit support structure based on intelligent monitoring and adaptive adjustment according to claim 1 is characterized in that: Bidirectional screws (222) are rotatably mounted on both sides of the I-shaped steel (221), and a limit slide bar (223) is mounted at the bottom of the bidirectional screw (222). The two ends of the bidirectional screw (222) and the adjacent limit slide bar (223) are respectively connected to two adjustment slide blocks (227), and the bidirectional screw (222) and the adjustment slide block (227) are connected via threads, and the limit slide bar (223) and the adjustment slide block (227) are slidably connected. One end of the bidirectional screw (222) is connected to a driven bevel gear (224), and driving bevel gears (225) are rotatably mounted on both sides of the top of the I-shaped steel (221) close to the driven bevel gear (224), the driven bevel gear (224) and the driving bevel gear (225) are meshed, and the top of the rotating shaft of the driving bevel gear (225) is connected to an adjusting head (226).

7. The deep foundation pit support structure based on intelligent monitoring and adaptive adjustment according to claim 1 is characterized in that: The input end of the pressure sensor (205) is electrically connected to the output end of the external controller, the input end of the oil hydraulic cylinder (204) is electrically connected to the output end of the external controller, and the input end of the external controller is electrically connected to the output end of the external power supply.

8. The deep foundation pit support structure based on intelligent monitoring and adaptive adjustment according to claim 6 is characterized in that: A supporting and protecting assembly (3) is provided at the middle bottom of a plurality of the steel sheet piles (1), and the supporting and protecting assembly (3) comprises a ground nail seat (301); A ground nail seat (301) is installed at the bottom of the support column (201), supporting ground nails (302) are installed at the four corners of the bottom of the ground nail seat (301), a jack (319) is installed at the top of the ground nail seat (301), and support plates (303) are installed on both sides of the top of the jack (319), and a plurality of positioning holes (304) are evenly and evenly spaced on the outside of the support plate (303), and a lifting frame (305) is sleeved on the outside of two adjacent support plates (303), and an arc plate (306) is welded on the top of the lifting frame (305), and the top of the arc plate (306) is in contact with the bottom of the support column (201), and a docking plate (307) is welded on the bottom of the lifting frame (305), and docking holes (308) are opened at both ends of the docking plate (307), and positioning pins (309) are embedded in the docking holes (308) and the adjacent positioning holes (304); A tightening hole (310) is formed at the top of the steel sheet pile (1). A rotating pull rod (311) is embedded inside the tightening hole (310). A limiting plate (312) is welded to one end of the rotating pull rod (311). A tightening thread (313) is formed at the other end of the rotating pull rod (311). A tightening cylinder (314) is connected to the outside of the tightening thread (313). One end of the tightening cylinder (314) is connected to one end of a tightening pull rod (315). The other end of the tightening pull rod (315) is connected to a fixed ear (317) through an adapter seat (316). A tightening ground nail (318) is embedded inside the fixed ear (317).

9. A deep foundation pit support structure construction method based on intelligent monitoring and adaptive adjustment, characterized in that: The construction of the deep foundation pit support structure based on intelligent monitoring and adaptive adjustment according to claim 8 includes the following steps: S1. Preparation and protection process: First, use a pile driver to vertically drive a plurality of steel sheet piles (1) into the ground in sequence. Insert the rotating pull rods (311) into the tightening holes (310) at equal intervals. Rotate the rotating pull rods (311) to connect the tightening cylinder (314) with the rotating pull rods (311) through the tightening threads (313). After connection, place the fixed ears (317) on the ground surface, and then insert the tightening ground nails (318) into the ground. S2. Support assembly process: Use a connecting plate (202) and fixing bolts to connect a plurality of support columns (201) one by one. Connect the semi-circular docking frame (219) with the corresponding connecting plate (202). Connect the assembly heads (203) to both ends of the connected support columns (201). Connect the hydraulic cylinders (204) with the assembly heads (203). Then use disassembly pins (210) to fixedly connect the fixed blocks (206) with the U-shaped frames (209). S3. Support installation process: Place the assembled support steel frame (208) parallel inside the foundation pit area, so that the limiting ears (215) on one side of the support steel frame (208) are butted against one side of the steel sheet pile (1). Rotate the adjusting screw (214) to drive the support block (213) to move along the adjusting slide rod (212) so that the support block (213) abuts against one side of the adjacent steel sheet pile (1). Connect the oil pipe used by the hydraulic cylinder (204) to the hydraulic cylinder (204), and connect the cable used by the pressure sensor (205) to the pressure sensor (205). S4. Support strengthening process: Use fixing bolts to connect the I-beam (221) with the semi-circular docking plate (220). Connect one end of the corresponding connecting rod (231) with the docking threaded cylinder (230) on the support column (201) and the adjusting slider (227). Connect two adjacent connecting rods (231) by rotating the rotating flat head (229) in cooperation with the threaded sleeve (233). S5, supporting and protecting step, placing the ground nail seat (301) at the bottom of the foundation pit, moving the supporting plate (303), embedding the supporting column (201) in the middle of the supporting plates (303) on both sides of the top of the ground nail seat (301), lifting the lifting frame (305), inserting the positioning pin (309) into the corresponding docking hole (308) and positioning hole (304), fixing the ground nail seat (301) at the bottom of the foundation pit by using the supporting ground nail (302), and appropriately adjusting the jack (319) so that the top of the arc plate (306) fits with the bottom of the supporting column (201).

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