Deep foundation pit support structure and construction method based on intelligent monitoring and adaptive adjustment

Abstract

The present invention discloses a deep foundation pit support structure and a construction method based on intelligent monitoring and adaptive adjustment, which relates to the field of foundation pit support structures and includes steel sheet piles. A support and lifting assembly is arranged at the top among several of the steel sheet piles. The support and lifting assembly includes support columns. Several support columns are installed among several of the steel sheet piles. Connection plates are welded at both ends of the support columns. Adjacent ends of the support columns are connected by connection plates and fixing bolts. The present invention controls the telescopic length of the output end of the oil cylinder through an external controller, so that the pressure between the steel sheet pile support steel frames always remains within a safe pressure range, avoiding the instability of the steel sheet piles and ensuring the safety and stability of the deep foundation pit construction. The connecting rods connected by the threaded sleeves form a triangle with the I-beams and the support columns, and the stability of the triangle is used to further strengthen the support stability of the overall foundation pit.

Description

Technical Field

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

[0002] A deep foundation pit refers to a project with a excavation depth exceeding 5 meters (including 5 meters), or a depth not exceeding 5 meters, but with particularly complex geological conditions, surrounding environment and underground pipelines. The steel sheet pile support structure is widely used in the process of foundation pit excavation construction, and has the advantages of fast construction, good support performance, low cost, recyclability, etc., and can achieve rapid support for the excavation free face of the foundation pit.

[0003] In the Chinese patent with the application number 202221953991.1 and the name of "A Deep Foundation Pit Support Structure", the setting of the connection mechanism of this patent avoids the deformation of the protective cover due to external impact, which is convenient for better protecting the deep pit. However, this patent cannot be adaptively adjusted according to the external pressure received by the foundation pit. When the existing steel sheet pile support structure supports the foundation pit, during the process of earth excavation, due to the influence of many environments, the steel sheet pile often deforms inward or even becomes unstable in the foundation pit. And the length of the support structure of the existing steel sheet pile is fixed and cannot be adjusted according to the pressure received by the steel sheet pile. After the steel sheet pile deforms, 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 construction method based on intelligent monitoring and adaptive adjustment, which can effectively solve the problem that the patent in the above background technology cannot be adaptively adjusted according to the external pressure received by the foundation pit. When the existing steel sheet pile support structure supports the foundation pit, during the process of earth excavation, due to the influence of many environments, the steel sheet pile often deforms inward or even becomes unstable in the foundation pit. And the length of the support structure of the existing steel sheet pile is fixed and cannot be adjusted according to the pressure received by the steel sheet pile. After the steel sheet pile deforms, it cannot effectively support the foundation pit, and the support effect is poor.

[0005] To achieve the above object, the present invention provides the following technical solution: A deep foundation pit support structure based on intelligent monitoring and adaptive adjustment, including steel sheet piles, and a support and lifting assembly is arranged at the top middle of several of the steel sheet piles, and the support and lifting assembly includes support columns;

[0006] 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 through the connection plates and fixing bolts. An assembly head is connected to the other end of adjacent support columns through the connection plates and fixing bolts. 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;

[0007] Two semi-circular docking frames are connected by fixing bolts on the outer sides of the two mutually contacting connection plates. Semi-circular docking plates are welded to both ends of the semi-circular docking frames. An I-beam is connected by fixing bolts between the opposite semi-circular docking plates. Two adjusting sliders are installed on both sides of the I-beam. A rotating seat is welded on 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 opened at both ends of the connecting rod. The outer sides of one ends of adjacent two connecting rods are connected to a threaded sleeve through the connecting threads.

[0008] 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.

[0009] 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 and the adjusting screw are connected through a threaded hole.

[0010] 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.

[0011] According to the above technical solution, wire pipe grooves are opened 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.

[0012] According to the above technical solution, a bidirectional screw is rotatably installed on both sides of the I-beam. 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 and the adjusting slider are connected by threads. The limiting sliding rod and the adjusting slider are slidably connected;

[0013] One end of the bidirectional screw is connected to a driven bevel gear, and driving bevel gears are rotatably installed on both sides of the top of the I-shaped steel near the driven bevel gear. The driven bevel gear is meshed with the driving bevel gear, and an adjusting head is connected to the top of the driving bevel gear rotating shaft.

[0014] According to the above technical solution, the pressure sensor input end is electrically connected to the external controller output end, the hydraulic cylinder input end is electrically connected to the external controller output end, and the external controller input end is electrically connected to the external power supply output end.

[0015] According to the above technical solution, a support and protection assembly is provided at the middle bottom of a plurality of the steel sheet piles, and the support and protection assembly includes a ground nail seat;

[0016] A ground nail seat is installed at the bottom of the support column, supporting ground nails are installed at the four corners of the bottom of the ground nail seat, a jack is installed on the top of the ground nail seat, and support plates are installed on both sides of the top of the jack. A plurality of positioning holes are evenly and evenly spaced on the outside of the support plate, and a lifting frame is sleeved on the outside of two adjacent support plates. An arc plate is welded on the top of the lifting frame, and the top of the arc plate fits the bottom of the support column. A docking plate is welded on the bottom of the lifting frame, and docking holes are opened at both ends of the docking plate. Positioning pins are embedded in the docking holes and adjacent positioning holes;

[0017] A tightening hole is provided on the top of the steel sheet pile, a rotating pull rod is embedded in the tightening hole, a limiting plate is welded at one end of the rotating pull rod, a tightening thread is provided 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 fixing ear through an adapter, a tightening ground nail is embedded in the fixing ear.

[0018] According to the above technical solution, the present invention also provides a deep foundation pit support structure construction method based on intelligent monitoring and adaptive adjustment, comprising the following steps:

[0019] S1, preparatory protection process, first use a pile driver to vertically drive multiple steel sheet piles into the ground in sequence, insert the rotating rods into the tightening holes at equal intervals, rotate the rotating rods, connect the tightening tube and the rotating rods through the tightening threads, place the fixing ears on the ground surface after connection, and then insert the tightening nails into the ground;

[0020] S2, support assembly process, using the connection plate and the fixing bolts to connect multiple support columns one by one, and connect the semicircular docking frame to the corresponding connection plate, connect the assembly head to the two ends of the connected support column, and connect the hydraulic cylinder to the assembly head, and then use the disassembly pin to fix the fixing block to the 匚-shaped frame;

[0021] S3. Support installation process: The assembled support steel frames are placed parallel inside the foundation pit area, aligning the limit ears on one side of the support steel frame with one side of the sheet piles. Rotate the adjustment screw to drive the support block to move along the adjustment slide bar, so that the support block abuts against one side of the adjacent 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;

[0022] S4. Support strengthening process: Use the fixing bolts to connect the I-beam with the semi-circular docking plate. Connect one end of the corresponding connecting rod to the docking threaded cylinder on the support column and the adjustment slider. Connect the adjacent two connecting rods by rotating the rotating flat head in cooperation with the threaded sleeve;

[0023] S5. Support and protection process: Place the ground nail seat at the bottom of the foundation pit, move the support plate, embed the support column between the two 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, and use the support ground nail to fix the ground nail seat at the bottom of the foundation pit. Appropriately adjust the jack so that the top of the arc plate fits against the bottom of the support column.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. There is a support lifting component, which aligns the limit ears on one side of the support steel frame with one side of the sheet piles. Under the limiting effect of the limit ears, the rapid fixed installation of the support steel frame is realized. The sheet piles limit the support steel frame, and when the support steel frame is subjected to lateral external forces, it will not move, ensuring the support stability of the foundation pit. By rotating the adjustment screw to drive the support block to move, the support block abuts against one side of the adjacent sheet pile, and together with the support of the limit ears on the sheet piles, all the sheet piles can be effectively supported, strengthening the support stability of the foundation pit;

[0026] Control the operation of the oil cylinder through the controller. The support steel frame squeezes the corresponding sheet piles. Under the action of the interaction of forces, support the side wall of the foundation pit. Each pressure sensor feeds back the pressure data to the external controller in real time. When the pressure on the 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 sheet pile and the support steel frame always remains within a safe pressure range, prevent the sheet pile from deforming, avoid the instability of the sheet pile, and ensure the safety and stability of the deep foundation pit construction. The fixing block and the U-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;

[0027] The adjacent two connecting rods are connected by rotating the flat head of the rotating rod and matching with the threaded sleeve. A triangle is formed between the connecting rod connected by the threaded sleeve, the I-beam and the support column. By 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. The position of the adjusting slider is adjusted by rotating the bidirectional screw, and by adding corresponding connecting rods and threaded sleeves, multiple connecting rods are connected. The device can be flexibly adjusted according to the size of the foundation pit, with a wide range of applications.

[0028] 2. A support and protection component is provided. After the steel sheet piles are driven, the rotating pull rods are inserted into the tightening holes at equal intervals. The limiting plate is located inside the steel sheet piles and is in contact with the steel sheet piles. Rotate the rotating pull rods, and connect the tightening cylinder with the rotating pull rods through the tightening threads. After connection, place the fixed ear on the ground surface, and then insert the tightening ground nails into the ground. When excavating the soil inside the steel sheet piles subsequently, under the connection action of the rotating pull rods and the tightening pull rods, the tightening ground nails can fix the top of the steel sheet piles, making the connection tightness between the steel sheet piles better during the subsequent excavation of the foundation pit, and the steel sheet piles will not shift and become unstable, ensuring the construction safety.

[0029] After the foundation pit excavation is completed, embed the support column between the two side support plates at the top of the ground nail seat, lift the lifting frame, and insert the positioning pins into the corresponding docking holes and positioning holes. Fix the ground nail seat at the bottom of the foundation pit by using the support ground nails, and appropriately adjust the jack to make the top of the arc plate fit with the bottom of the support column. The arc plate supports the support column, strengthening the support stability of the support column and preventing the support column from falling, fully ensuring the construction safety.

[0030] In summary, in the support and lifting component, the oil cylinder is used to adaptively adjust the pressure between the sheet pile support steel frames, ensuring the safety of subsequent construction. The support and protection component can ensure the stability of the steel sheet piles at the initial stage of excavating the soil. After the soil is excavated, it ensures the support stability in the support and lifting component. The two components cooperate with each other to fully ensure the safety of the overall construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings are used to provide a further understanding of the present invention and form a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0032] In the drawings:

[0033] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0034] Figure 2 is a structural schematic diagram of the support and lifting component of the present invention;

[0035] Figure 3 It is a schematic diagram of the installation structure of the support column of the present invention;

[0036] Figure 4 It is a schematic diagram of the installation structure of the oil cylinder of the present invention;

[0037] Figure 5 It is a schematic diagram of the installation structure of the support steel frame of the present invention;

[0038] Figure 6 It is a schematic diagram of the installation structure of the support block of the present invention;

[0039] Figure 7 It is a schematic diagram of the installation structure of the connecting rod of the present invention;

[0040] Figure 8 It is from the present invention Figure 7 Enlarged view of area A;

[0041] Figure 9 It is a schematic diagram of the structure of the support and protection assembly of the present invention;

[0042] Figure 10 It is a schematic diagram of the installation structure of the arc plate of the present invention;

[0043] Figure 11 It is a schematic diagram of the installation structure of the tightening pull rod of the present invention;

[0044] Figure 12 It is a schematic diagram of the construction method of the present invention;

[0045] Reference numerals in the figure: 1, steel sheet pile;

[0046] 2, support and lifting assembly; 201, support column; 202, connection disk; 203, assembly head; 204, oil cylinder; 205, pressure sensor; 206, fixed block; 207, disassembly hole; 208, support steel frame; 209, C-shaped frame; 210, disassembly pin; 211, support frame; 212, adjusting slide bar; 213, support block; 214, adjusting screw; 215, limiting ear; 216, wire pipe groove; 217, fixing port; 218, fixing frame; 219, semi-circular docking frame; 220, semi-circular docking disk; 221, I-beam; 222, bidirectional screw; 223, limiting slide bar; 224, driven bevel gear; 225, driving bevel gear; 226, adjusting head; 227, adjusting slider; 228, rotating seat; 229, rotating flat head; 230, docking threaded cylinder; 231, connecting rod; 232, connecting thread; 233, threaded sleeve;

[0047] 3. Support and protection components; 301. Ground nail base; 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 pull rod; 312. Limiting plate; 313. Tightening thread; 314. Tightening cylinder; 315. Tightening pull rod; 316. Adapter seat; 317. Fixed ear; 318. Tightening ground nail; 319. Jack. Detailed implementation manner

[0048] The preferred embodiments of the present invention will be 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.

[0049] Embodiment: As Figure 1-11 shown, 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, there is a support and lifting component 2. The support and lifting component 2 includes a support column 201, a connection disk 202, an assembly head 203, an oil cylinder 204, a pressure sensor 205, a fixed block 206, a disassembly hole 207, a support steel frame 208, a C-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 limiting ear 215, a wire pipe groove 216, a fixed port 217, a fixed frame 218, a semi-circular docking frame 219, a semi-circular docking disk 220, an I-beam 221, a bidirectional screw 222, a limiting 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;

[0050] A number of steel sheet piles 1 are installed with a number of support columns 201 in the middle. Connection plates 202 are welded at both ends of the support columns 201. One end between adjacent support columns 201 is connected by the connection plate 202 and fixing bolts. The other end of adjacent support columns 201 is 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 of the output end of the oil cylinder 204 is connected with a fixing block 206 through a pressure sensor 205. The top of the fixing block 206 is connected with a support steel frame 208. The input end of the pressure sensor 205 is electrically connected to the output end of an external controller. The input end of the oil cylinder 204 is electrically connected to the output end of the external controller. The input end of the external controller is electrically connected to 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;

[0051] 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. The disassembly pin 210 passes 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 limiting ears 215 are welded at equal intervals on one side of the support steel frame 208. The limiting ears 215 are attached to the adjacent steel sheet pile 1;

[0052] A support frame 211 is fixed by fixing bolts on one side of the support steel frame 208 near the limiting ear 215. Two adjusting slide bars 212 are welded to the top of the support frame 211. A support block 213 is slidably connected between adjacent two adjusting slide bars 212. The contact surfaces between the adjusting slide bars 212 and the support block 213 are all smooth surfaces, reducing the frictional resistance between the adjusting slide bars 212 and the support block 213. An adjusting screw 214 is rotatably installed in the middle of the top of the support frame 211 between adjacent two adjusting slide bars 212. The support block 213 is connected to the adjusting screw 214 through a threaded hole. Rotating the adjusting screw 214 can drive the support block 213 to move along the adjusting slide bars 212. The support block 213 can resist the adjacent steel sheet pile 1. Cooperating with the support of the limiting ear 215 for the steel sheet pile 1, all the steel sheet piles 1 can be effectively supported;

[0053] Both the top and bottom of the support steel frame 208 are provided with wire pipe grooves 216. Through holes are formed at both ends of the support steel frame 208, and a fixing frame 218 is fixed inside the through holes 217 by fixing bolts. The oil pipes connected to the hydraulic cylinder 204 and the cables connected to the pressure sensor 205 can be placed inside the wire pipe grooves 216. The fixing frame 218 is used to fix the oil pipes and the cables, so that the oil pipes and the cables can be placed neatly, avoiding the scattering of the oil pipes and the cables to hinder the construction progress;

[0054] Two semi-circular docking frames 219 are connected to the outside of the two mutually attached connecting disks 202 by fixing bolts. Semi-circular docking disks 220 are welded at both ends of the semi-circular docking frames 219. An I-beam 221 is connected between the opposite semi-circular docking disks 220 by fixing bolts. Two adjusting sliders 227 are installed on both sides of the I-beam 221. Two-way screw rods 222 are rotatably installed on both sides of the I-beam 221. A limiting slide rod 223 is installed at the bottom of the two-way screw rod 222. The two ends of the two-way screw rod 222 and the adjacent limiting slide rod 223 are respectively connected to the two adjusting sliders 227. The two-way screw rod 222 is connected to the adjusting slider 227 by threads. The limiting slide rod 223 is slidably connected to the adjusting slider 227. Under the limiting action of the limiting slide rod 223, rotating the two-way screw rod 222 can drive the adjusting slider 227 to move along the limiting slide rod 223;

[0055] One end of the two-way screw rod 222 is connected to a driven bevel gear 224. Driving bevel gears 225 are rotatably installed on both sides of the top of the I-beam 221 near the driven bevel gear 224. The driven bevel gear 224 is meshed with the driving bevel gear 225. The top of the rotating shaft of the driving bevel gear 225 is connected to an adjusting head 226. 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 two-way screw rod 222 to rotate, facilitating the adjustment of the position of the adjusting slider 227;

[0056] A rotating seat 228 is welded on 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. One end of the rotating flat head 229 is welded with a docking threaded barrel 230. One end of a connecting rod 231 is connected inside the docking threaded barrel 230. Connecting threads 232 are formed at both ends of the connecting rod 231. A threaded sleeve 233 is connected to the outside of one end of the adjacent two connecting rods 231 by the connecting threads 232;

[0057] A support and protection assembly 3 is arranged at the middle bottom of several steel sheet piles 1. The support and protection assembly 3 includes a ground nail seat 301, support ground nails 302, a support plate 303, positioning holes 304, a lifting frame 305, an arc plate 306, a docking plate 307, docking holes 308, positioning pins 309, tightening holes 310, rotating pull rods 311, limiting plates 312, tightening threads 313, tightening cylinders 314, tightening pull rods 315, adapter seats 316, fixed ears 317, tightening ground nails 318 and jacks 319;

[0058] A ground nail seat 301 is installed at the bottom of the support column 201. Support 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. Support plates 303 are installed on both sides of the top of the jack 319. A number of positioning holes 304 are evenly arranged at equal intervals on the outer sides of the support plates 303. A lifting frame 305 is sleeved on the outer sides of two adjacent support plates 303. An arc plate 306 is welded to the top of the lifting frame 305. The top of the arc plate 306 is attached to the bottom of the support column 201. A docking plate 307 is welded to the bottom of the lifting frame 305. Docking holes 308 are opened at both ends of the docking plate 307. A positioning pin 309 is embedded in the docking holes 308 and the adjacent positioning holes 304. The positioning pin 309 can position the position of the arc plate 306. When the positioning pin 309 is removed from the positioning holes 304 and the docking holes 308, the lifting frame 305 can be lifted and lowered along the support plate 303. Then, the positioning pin 309 is inserted into the corresponding positioning holes 304 and docking holes 308, which is convenient for changing the position of the arc plate 306;

[0059] Tightening holes 310 are opened at the top of the steel sheet pile 1. A rotating pull rod 311 is embedded in the tightening holes 310. A limiting plate 312 is welded to one end of the rotating pull rod 311. A tightening thread 313 is opened 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 fixed ear 317 through an adapter seat 316. A tightening ground nail 318 is embedded in the fixed ear 317.

[0060] As Figure 12 shown, 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:

[0061] S1. Preparation and protection process: First, use a pile driver to vertically drive multiple 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, and connect the tightening cylinders 314 to 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;

[0062] S2. Support assembly process: Use the connection plate 202 and fixing bolts to connect multiple support columns 201 one by one, connect the semi-circular docking frame 219 to the corresponding connection plate 202, connect the assembly head 203 to both ends of the connected support columns 201, connect the hydraulic cylinder 204 to the assembly head 203, and then use the disassembly pin 210 to fixedly connect the fixed block 206 to the U-shaped frame 209;

[0063] S3. Support installation process: Place the assembled support steel frame 208 horizontally inside the foundation pit area, align the limit ear 215 on one side of the support steel frame 208 with the butt joint on one side of the steel sheet pile 1, rotate the adjustment screw 214 to drive the support block 213 to move along the adjustment slide bar 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;

[0064] 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 barrel 230 on the support column 201 and the adjustment slider 227, and connect two adjacent connecting rods 231 by rotating the rotating flat head 229 in cooperation with the threaded sleeve 233;

[0065] S5. Support protection process: Place the ground nail seat 301 at the bottom of the foundation pit, move the support plate 303, insert the support column 201 between the support plates 303 on both sides of the top of the ground nail seat 301, lift the lifting frame 305, insert the positioning pin 309 into the corresponding docking hole 308 and positioning hole 304, use the support ground nail 302 to fix the ground nail seat 301 at the bottom of the foundation pit, and appropriately adjust the jack 319 so that the top of the arc plate 306 fits against the bottom of the support column 201.

[0066] The working principle and usage process of the present invention: When excavating the 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, and 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 plate 312 is located inside the steel sheet pile 1 and fits against the steel sheet pile 1. Rotate the rotating pull rod 311, connect the tightening cylinder 314 to the rotating pull rod 311 through the tightening thread 313. After connection, place the fixed ear 317 on the ground surface, and then insert the tightening ground nail 318 into the ground. When subsequently excavating the soil inside the steel sheet pile 1, under the connection action of the rotating pull rod 311 and the tightening pull rod 315, the tightening ground nail 318 can fix the top of the steel sheet pile 1. When subsequently excavating the foundation pit, the steel sheet pile 1 will not shift, making the connection tightness between the steel sheet piles 1 better;

[0067] According to the width of the foundation pit, use the connection plate 202 and the fixing bolts to connect multiple support columns 201 one by one, so that the connected support columns 201 are suitable for the width of the excavated foundation pit, and connect the semi-circular docking frame 219 with the corresponding connection plate 202. After the connection of the support columns 201 is completed, connect the assembly head 203 to both ends of the connected support columns 201, and connect the oil cylinder 204 with the assembly head 203. Then use the disassembly pin 210 to fixedly connect the fixed block 206 with the U-shaped frame 209. At this time, the support steel frame 208 is fixedly connected to the output end of the oil cylinder 204, and the connection and assembly of the support steel frame 208 are completed;

[0068] Use an excavator to gradually remove the soil inside the rectangular area surrounded by the steel sheet piles 1. After a part of the soil inside the foundation pit area is removed, the crane hoists the connected support columns 201 one by one and places the assembled support steel frame 208 parallel inside the foundation pit area, so that the limit ear 215 on one side of the support steel frame 208 is butted against one side of the steel sheet pile 1. Under the limiting action of the limit ear 215, the rapid fixed installation of the support steel frame 208 is realized. At the same time, the steel sheet pile 1 limits the support steel frame 208, and the support steel frame 208 will not move when subjected to lateral external forces, 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, and cooperate with the support of the limit ear 215 on the steel sheet pile 1, so that all the steel sheet piles 1 can be effectively supported, strengthening the support stability of the foundation pit;

[0069] Connect the oil pipe used by the oil cylinder 204 to the oil cylinder 204, connect the cable used by the pressure sensor 205 to the pressure sensor 205, place the oil pipe and the cable inside the wire duct 216, and use the fixing frame 218 to fix the oil pipe and the cable, so that the oil pipe and the cable can be placed neatly, avoiding the oil pipe and the cable from being scattered and hindering the subsequent construction. When all the support steel frames 208, oil pipes and cables located at the top of the foundation pit are installed, the controller controls the operation of the oil cylinder 204. The output end of the oil cylinder 204 extends, and the support steel frame 208 presses the corresponding steel sheet pile 1. Under the interaction of forces, the support column 201 can be fixedly 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, and the external controller controls the oil cylinder 204 to keep the pressure between the steel sheet pile 1 and the support steel frame 208 within a safe pressure range at all times, preventing the steel sheet pile 1 from deforming and ensuring the safety and stability of the deep foundation pit construction;

[0070] Subsequently, the I-beam 221 is connected to the semi-circular docking plate 220 using fixing bolts. After the connection of the I-beam 221 is completed, one end of the corresponding connecting rod 231 is connected to the docking threaded barrel 230 on the support column 201 and the adjusting slider 227. By rotating the rotating flat head 229 and cooperating with the threaded sleeve 233, two adjacent connecting rods 231 are connected. The connection of the I-beam 221 strengthens the connection stability between each connecting support column 201. The connecting rod 231 connected by the threaded sleeve 233 forms a triangle with the I-beam 221 and the support column 201. Utilizing the stability of the triangle, the compressive strength of the I-beam 221 and the support column 201 is higher, further strengthening the support stability of the foundation pit.

[0071] When the width of the foundation pit is relatively wide and the number of interconnected support columns 201 is large, and the lengths of the connecting rods 231 on both sides of the I-beam 221 are insufficient to be connected by the threaded sleeve 233, the electric wrench is used to rotate the adjusting head 226. Under the connection and driving action of the driven bevel gear 224 and the driving bevel gear 225, the bidirectional screw rod 222 is driven to rotate, adjusting the position of the adjusting slider 227. By adding the corresponding connecting rods 231 and threaded sleeves 233, multiple connecting rods 231 are connected. The device can be flexibly adjusted according to the size of the foundation pit, with a wide range of applications.

[0072] The assembly head 203 can be connected to the semi-circular docking plate 220. The semi-circular docking plates 220 at both ends of the foundation pit are connected to the oil cylinder 204, and the oil cylinder 204 is connected to the support steel frame 208. The oil cylinders 204 at both ends of the foundation pit drive the support steel frame 208 to apply pressure to the sheet piles 1 at both ends of the foundation pit, ensuring the support stability of the entire foundation pit.

[0073] After 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 between the two support plates 303 at the top of the ground nail seat 301. The lifting frame 305 is lifted, and the positioning pin 309 is inserted into the corresponding docking hole 308 and positioning hole 304. The ground nail seat 301 is fixed to the bottom of the foundation pit using the support ground nail 302, and the jack 319 is appropriately adjusted so that the top of the arc plate 306 is in contact with the bottom of the support column 201. The arc plate 306 supports the support column 201, strengthening the support stability of the support column 201 and preventing the support column 201 from falling, fully ensuring construction safety.

[0074] Finally, it should be noted that the above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within 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 assembly (2) is arranged at the middle top of several of the steel sheet piles (1), and the support and lifting assembly (2) includes a support column (201). Several support columns (201) are installed among 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 through the connection plate (202) and fixing bolts. An assembly head (203) is connected to the other end of adjacent support columns (201) through the connection plate (202) and fixing bolts. An oil cylinder (204) is connected to the top of the assembly head (203). A fixing block (206) is connected to the top end of the output end of the oil cylinder (204) 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 adjacent steel sheet piles (1). Two semi-circular docking frames (219) are connected to the outside of two mutually contacting connection plates (202) through fixing bolts. Semi-circular docking plates (220) are welded to both ends of the semi-circular docking frame (219). An I-beam (221) is connected between the opposite semi-circular docking plates (220) through fixing bolts. 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 to 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 to the inside of the docking threaded cylinder (230). Connecting threads (232) are provided at both ends of the connecting rod (231). A threaded sleeve (233) is connected to the outside of one end of adjacent two connecting rods (231) through the connecting thread (232). A support frame (211) is fixed to one side of the support steel frame (208) near the limiting ear (215) through fixing bolts. 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 to the adjusting screw (214) through a threaded hole.

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 to 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 through 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 1 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.

4. 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.

5. 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).

6. 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 pressure 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.

7. The deep foundation pit support structure based on intelligent monitoring and adaptive adjustment according to claim 5 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 fixing ear (317) through an adapter seat (316). A tightening ground nail (318) is embedded inside the fixing ear (317).

8. 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 7 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 cylinders (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. S2. Support assembly process: Use the connecting plates (202) and fixing bolts to connect the support columns (201) one by one. Connect the semi-circular docking frames (219) with the corresponding connecting plates (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 the disassembly pins (210) to fixedly connect the fixing 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 pipes used by the hydraulic cylinders (204) to the hydraulic cylinders (204). Connect the cables used by the pressure sensors (205) to the pressure sensors (205). S4. Support strengthening process: Use fixing bolts to connect the I-shaped steel (221) with the semi-circular docking plates (220). Connect one end of the corresponding connecting rod (231) with the docking threaded cylinders (230) on the support columns (201) and the adjusting sliders (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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