An assembled reverse-type annular support device for inspection well foundation pit

Abstract

The present invention discloses an assembled reverse-made annular support device for an inspection well foundation pit, which relates to the technical field of foundation pit support devices, including an arc-shaped main rod, a convenient support component is arranged on one side of the arc-shaped main rod, and the convenient support component includes a support steel plate, a support steel plate is welded between two arc-shaped main rods on the same side, side connection holes are opened on the top and bottom of several longitudinal rods, two adjacent side connection holes are connected with side connection seats by bolts, a connecting rod is connected between two adjacent side connection seats, and fixing ears are welded on both sides of the connecting rod. The present invention effectively supports the arc-shaped main rod through transverse rods, longitudinal rods and diagonal bracing rods, and the overall support device forms a lattice annular skeleton with a ring-shaped plane shape. The whole device is light and has a fast installation speed. The shape of the connection of the same layer of reinforced steel plates constitutes a regular octagon. The octagon is highly symmetrical, which reduces local stress concentration, thereby improving the overall stability and further increasing the support strength.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit support devices, in particular to an assembled reverse-operated annular support device for a manhole foundation pit. Background Art

[0002] Inspection well foundation pit is a facility used to receive, inspect and repair pipeline systems. It is usually built at pipeline intersections or bends. The main function of the inspection well foundation pit is to inspect, maintain and clean the pipeline system to ensure the normal operation of the pipeline system. When the inspection well is constructed in the construction project, the shape of the inspection well is square or circular, and the foundation pit area is small. Common forms of foundation pits include slope, soil nail wall support, steel sheet pile support, etc.

[0003] In the Chinese patent application number 202322230551.4, entitled “A foundation pit support device for civil construction,” the patent fixes the protective plate with a first bolt and a second bolt, fixes the connecting rod with a third bolt, and adjusts the spacing between the protective plates according to the size of the foundation pit by sliding the position of the protective plates, thereby improving the adaptability of the device.

[0004] This patent is suitable for supporting shallow foundation pits. When supporting deeper foundation pits, larger protective plates are required. Large protective plates are inconvenient to install and disassemble, and the construction is difficult. If slope support is adopted, the surrounding slope width is large, the amount of earth excavation and backfilling is large, and the impact on the surrounding area of ​​the foundation pit is large. If soil nail wall support is adopted, the concrete hardening period is long and more construction machinery is required. If steel sheet pile support is adopted, the construction machinery is large and vibration noise is generated. Summary of the Invention

[0005] The present invention provides an assembled reverse-type annular support device for an inspection well foundation pit, which can effectively solve the problems in the above-mentioned background technology of great construction difficulty, large impact range on the surrounding area of ​​the foundation pit, many construction machines, use of steel sheet pile support, large construction machines, and vibration noise.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: an assembled reverse-type annular support device for a manhole foundation pit, comprising an arc-shaped main rod, a convenient support assembly provided on one side of the arc-shaped main rod, and the convenient support assembly comprising a supporting steel plate;

[0007] A supporting steel plate is welded between the two arc-shaped main rods on the same side, a plurality of transverse rods are welded between two adjacent arc-shaped main rods, longitudinal rods are vertically welded between the two ends of the adjacent transverse rods, and a diagonal brace is obliquely welded between the two adjacent transverse rods;

[0008] Side connection holes are provided at both the top and bottom of several of the longitudinal rods. Adjacent two of the side connection holes are connected by bolts to a side connection seat. A connecting rod is connected between adjacent two of the side connection seats. Fixing ears are welded on both sides of the connecting rod. A reinforcing steel plate is connected between the two fixing ears through a U-shaped sleeve. The fixing ears and the U-shaped sleeve are connected by bolts;

[0009] Longitudinal connection holes are provided on both sides of the top of the arc-shaped main rod. A fixing steel plate is connected to the top of the longitudinal connection hole at the topmost position. The two mutually-adhering arc-shaped main rods are connected by bolts and the longitudinal connection holes.

[0010] According to the above technical solution, a fixing seat is welded on the top of the fixing steel plate. An adjusting frame is fixed on the top of the fixing seat by bolts. An adjusting steel plate is connected inside the adjusting frame. One end of the bottom of the adjusting steel plate is welded with a fixing pull rod. The top end of the fixing pull rod is welded with a triangular frame. Fixing ground nails are installed through the three corners of the triangular frame.

[0011] According to the above technical solution, a connecting sliding rod is welded at one end of the arc-shaped main rod. A connecting sliding groove is welded at the other end of the arc-shaped main rod. The arc-shaped main rods are connected pairwise through the connecting sliding rod and the connecting sliding groove. The connecting sliding rod is embedded inside the adjacent connecting sliding groove. Rubber pads are bonded to both ends of the support steel plate.

[0012] According to the above technical solution, the cross-section of the connecting sliding rod is "T"-shaped. The connecting sliding rod is closely fitted inside the adjacent connecting sliding groove. The outer side of the connecting sliding rod and the inner side of the connecting sliding groove are both smooth surfaces.

[0013] According to the above technical solution, pressure relief ports are provided at equal intervals on the outer side of the support steel plate. Pressure relief doors are hinged inside the pressure relief ports. Connecting ears are welded on both sides of the pressure relief ports and both sides of the pressure relief doors. Connecting bolts are connected between adjacent two of the connecting ears.

[0014] According to the above technical solution, a number of positioning outer holes are provided at equal intervals on both sides of the adjusting frame. A number of positioning inner holes are provided at equal intervals on one side of the adjusting steel plate. Positioning bolts are connected between the two positioning outer holes and the two positioning inner holes.

[0015] According to the above technical solution, a strengthening inner support component is provided on the inner side of the support steel plate. The strengthening inner support component includes a support steel pipe;

[0016] A number of support steel pipes are connected to the center inside the supporting steel plate. A placing seat one is welded at equal intervals in the middle on the outside of the support steel pipe. A placing seat two is welded in the middle on one side of the strengthening steel plate. A connecting frame is fixed inside the placing seat one and the placing seat two through bolts. An inner support rod is welded at one end of the connecting frame. A threaded sleeve is connected between adjacent two inner support rods through threads. Connecting rings are welded at both ends of the support steel pipe. Adjacent two support steel pipes are connected through connecting rings and a number of bolts;

[0017] The bottom of the support steel pipe located at the bottommost is connected with a support chassis through a connecting ring and a bolt. A number of limiting slide rods are evenly welded at the bottom of the support chassis. A lifting threaded cylinder is welded at the center of the bottom of the support chassis. The bottom of the lifting threaded cylinder is connected with a support base. Limiting sleeves are evenly welded at the positions corresponding to the limiting slide rods on the top of the support base. The limiting slide rods are embedded inside the limiting sleeves. A lifting screw rod is rotatably installed at the center of the top of the support base. The lifting screw rod is connected with the lifting threaded cylinder through threads. Support ground nails are installed through the triangular positions of the support base.

[0018] According to the above technical solution, ventilation holes are opened on the outside of the support steel pipe. Air supply pipes are welded on one side of two transverse rods. A number of air supply holes are evenly opened on one side of the air supply pipe. A butt joint pipe is welded at the bottom of the air supply pipe. A closed sleeve is connected to the outside of the air supply pipe through threads. A communication port is opened on one side of the closed sleeve.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. A convenient support component is provided. After every two layers of supporting steel plates are installed, the side connection seat and the connecting rod are connected and fixed by bolts and two adjacent side connection holes, and the strengthening steel plate is connected by bolts, fixed ears and U-shaped sleeves. The supporting steel plates are connected layer by layer to isolate the side wall of the foundation pit, avoiding the earth blocks and stones on the side wall of the foundation pit from injuring the staff inside the foundation pit and ensuring the personal safety of the staff;

[0021] The transverse rod, the longitudinal rod and the diagonal brace effectively support the arc-shaped main rod. The overall support device forms a lattice ring-shaped skeleton, and the planar shape is annular. Using an annular shape makes each rod of the device bear force axially. The rods are slender, the whole device is light, and a small mechanical device can be used for hoisting and installation. The installation speed is fast, convenient and quick. Moreover, the shape formed by the connection of the strengthening steel plates on the same layer constitutes a regular octagon, which has the advantages of light self-weight and high bearing capacity. The octagon has high symmetry, and this symmetry helps to evenly distribute external forces and reduce local stress concentration, thereby improving the overall stability and further increasing the support strength;

[0022] Fixed ground nails are driven into the soil of the inspection well foundation pit slope to fix the topmost supporting steel plate. This prevents the entire device from sinking during subsequent inspection well foundation pit excavation. At the same time, the position of the adjusting steel plate on the corresponding adjusting frame is adjusted according to the height of the inspection well foundation pit slope and fixed with positioning bolts. This allows the tripod to be fixed on foundation pit slopes of different heights. It has a wide range of applications and can effectively fix the supporting steel plates inside the foundation pit using fixed pull rods, making the internal support more stable.

[0023] 2. A reinforced inner support assembly is provided. The supporting steel pipes are connected by bolts and connecting rings. The connected supporting steel pipes are placed in the center of the foundation pit. The connecting frames at both ends are placed inside the first and second seats respectively and fixed with bolts. Under the connection of the inner support rod and the threaded sleeve, the supporting steel plate is further strengthened and supported, so that the overall device has higher compressive resistance and better support effect. The threaded sleeve can be adjusted according to the distance between the first and second seats on the same layer, and has a wide range of adaptability.

[0024] When the diameter of the inspection well foundation pit is large, the bottom of the bottommost supporting steel pipe is connected to the supporting chassis by bolts. By rotating the lifting screw, under the limiting action of the limiting slide bar, the limiting sleeve moves along the limiting slide bar, and the supporting base is in close contact with the bottom surface of the foundation pit. The supporting base is fixed with supporting ground nails to achieve stable fixation of the supporting steel pipe, making the supporting device more stable.

[0025] When the inspection well pit is deep, rotate the closed casing at the bottom of the pit to align the connecting port with the air supply hole, connect the air outlet end of the blower to the top of the top air supply pipe, and connect the exhaust end of the exhaust fan to the top of the top supporting steel pipe. Fresh air is ejected from the air supply hole into the bottom of the pit through the blower. The original air inside the pit enters the supporting steel pipe through the air exchange hole and is finally discharged through the exhaust fan, realizing the circulation of air inside the pit, which helps to remove heat in the inspection well pit, improve air quality and ensure the health of the staff.

[0026] In summary, the horizontal and vertical connections in the convenient support assembly and the reinforced internal support assembly are all connected by bolts and assembled by splicing. The installation speed is fast and they can be quickly disassembled and reused after the construction is completed, effectively reducing the project cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] In the attached figure:

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the convenient support assembly of the present invention;

[0031] Figure 3 Schematic diagram of the installation structure of the support steel plate of the present invention;

[0032] Figure 4 Schematic diagram of the installation structure of the reinforced steel plate of the present invention;

[0033] Figure 5 2 is a schematic diagram of the installation structure of the tripod of the present invention;

[0034] Figure 6 It is a schematic structural diagram of the reinforced inner support assembly of the present invention;

[0035] Figure 7 Schematic diagram of the installation structure of the closed sleeve of the present invention;

[0036] Figure 8 It is a schematic diagram of the installation structure of the threaded sleeve of the present invention;

[0037] Figure 9 It is a schematic diagram of the installation structure of the supporting chassis of the present invention;

[0038] Numbers in the figure: 1, curved main rod;

[0039] 2. Convenient support assembly; 201. Support steel plate; 202. Horizontal rod; 203. Longitudinal rod; 204. Diagonal brace; 205. Connecting slide bar; 206. Connecting slide groove; 207. Rubber pad; 208. Pressure relief port; 209. Connecting ear; 210. Connecting bolt; 211. Side connection hole; 212. Side connection seat; 213. Connecting rod; 214. Fixing ear; 215. Reinforced steel plate; 216. Type sleeve; 217. Longitudinal connection hole; 218. Fixing steel plate; 219. Fixing seat; 220. Adjusting frame; 221. Positioning outer hole; 222. Adjusting steel plate; 223. Positioning inner hole; 224. Positioning bolt; 225. Fixing rod; 226. Tripod; 227. Fixing ground nail; 228. Pressure relief door;

[0040] 3. Strengthen the inner support assembly; 301. Support steel pipe; 302. Place one seat; 303. Connecting frame; 304. Inner support rod; 305. Threaded sleeve; 306. Connecting ring; 307. Support chassis; 308. Limiting slide bar; 309. Lifting threaded cylinder; 310. Support base; 311. Limiting sleeve; 312. Lifting screw; 313. Support ground nail; 314. Ventilation hole; 315. Air supply pipe; 316. Air supply hole; 317. Docking pipe; 318. Closing sleeve; 319. Connecting port; 320. Place two seats. DETAILED DESCRIPTION

[0041] 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 for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0042] Embodiment: As Figure 1-9 shown, the present invention provides a technical solution for an assembled reverse construction ring-shaped support device for inspection well foundation pits, including an arc-shaped main rod 1. A convenient support component 2 is provided on one side of the arc-shaped main rod 1. The convenient support component 2 includes a support steel plate 201, a transverse rod 202, a longitudinal rod 203, a diagonal brace rod 204, a connecting slide rod 205, a connecting chute 206, a rubber pad 207, a pressure relief port 2, a connecting ear 209, a connecting bolt 210, a side connection hole 211, a side connection seat 212, a connecting rod 213, a fixing ear 214, a reinforcing steel plate 215, a U-shaped sleeve 216, a longitudinal connection hole 217, a fixing steel plate 218, a fixing seat 219, an adjusting frame 220, a positioning outer hole 221, an adjusting steel plate 222, a positioning inner hole 223, a positioning bolt 224, a fixing pull rod 225, a triangular frame 226, a fixing ground nail 227 and a pressure relief door 228;

[0043] A support steel plate 201 is welded between two arc-shaped main rods 1 on the same side. A plurality of transverse rods 202 are welded between adjacent arc-shaped main rods 1. Longitudinal rods 203 are perpendicularly welded between the two ends of adjacent transverse rods 202. Diagonal brace rods 204 are obliquely welded between adjacent transverse rods 202;

[0044] A connecting slide rod 205 is welded to one end of the arc-shaped main rod 1, and a connecting chute 206 is welded to the other end of the arc-shaped main rod 1. The arc-shaped main rods 1 are connected to each other in pairs through the connecting slide rod 20 and the connecting chute 206. The connecting slide rod 205 is embedded inside the adjacent connecting chute 206. The cross-section of the connecting slide rod 205 is "T"-shaped. The connecting slide rod 205 is closely fitted to the inside of the adjacent connecting chute 206. Through the docking of the connecting slide rod 205 and the connecting chute 206, the assembly is more convenient and fast. The outer side of the connecting slide rod 205 and the inner side of the connecting chute 206 are both smooth surfaces, which reduces the frictional resistance between the connecting slide rod 205 and the connecting chute 206, making the assembly easier. Rubber pads 207 are bonded to both ends of the support steel plate 201. The rubber pads 207 are elastic. When the support steel plates 201 are butted, the rubber pads 207 are closely fitted to each other, making the connection of the support steel plates 201 tighter;

[0045] On the outer side of the support steel plate 201, pressure relief openings 208 are arranged at equal intervals. A pressure relief door 228 is hinged inside the pressure relief openings 208. Connecting ears 209 are welded on both sides of the pressure relief openings 208 and both sides of the pressure relief door 228. A connecting bolt 210 is connected between adjacent connecting ears 209. When the pressure on the support steel plate 201 is too large and it is difficult to remove the support steel plate 201 from the foundation pit, open the pressure relief door 228 on the side with greater pressure, clean a part of the soil or gravel on one side, reduce the pressure on the support steel plate 201, and make the disassembly of the device easier;

[0046] On the top and bottom of several longitudinal rods 203, side connection holes 211 are opened. Adjacent side connection holes 211 are connected by bolts to a side connection seat 212. A connecting rod 213 is connected between adjacent side connection seats 212. Fixing ears 214 are welded on both sides of the connecting rod 213. A reinforcing steel plate 215 is connected between the two fixing ears 214 through a U-shaped sleeve 216. The fixing ears 214 and the U-shaped sleeve 216 are connected by bolts;

[0047] On both sides of the top of the arc main rod 1, longitudinal connection holes 217 are opened. At the top of the longitudinal connection hole 217 at the topmost position, a fixing steel plate 218 is connected. Between two mutually fitting arc main rods 1, they are connected through bolts and the longitudinal connection holes 217. A fixing seat 219 is welded on the top of the fixing steel plate 218. An adjusting frame 220 is fixed on the top of the fixing seat 219 through bolts. An adjusting steel plate 222 is connected inside the adjusting frame 220. At one end of the bottom of the adjusting steel plate 222, a fixing pull rod 225 is welded. At the top of the fixing pull rod 225, a triangular frame 226 is welded. A fixing ground nail 227 is installed through the triangular positions of the triangular frame 226. The fixing steel plate 218 plays a role in connection and fixation. When installing the support steel plate 201, first connect the fixing steel plate 218 with the topmost arc main rod 1, and drive the fixing ground nail 227 into the soil inside the slope on the outer side of the inspection well foundation pit to fix the topmost support steel plate 201;

[0048] On both sides of the adjusting frame 220, a number of positioning outer holes 221 are arranged at equal intervals. On one side of the adjusting steel plate 222, a number of positioning inner holes 223 are arranged at equal intervals. A positioning bolt 224 is connected between two positioning outer holes 221 and two positioning inner holes 223. The positioning bolt 224 can fix the adjusting frame 220 and the adjusting steel plate 222, change the position of the adjusting steel plate 222 inside the adjusting frame 220, and make the triangular frame 226 be fixed on the foundation pit slopes at different heights, with a wide range of applications;

[0049] A reinforced inner support assembly 3 is provided on the inner side of the supporting steel plate 201. The reinforced inner support assembly 3 includes a supporting steel pipe 301, a placement seat 302, a connecting frame 303, an inner support rod 304, a threaded sleeve 305, a connecting ring 306, a supporting chassis 307, a limiting slide rod 308, a lifting threaded cylinder 309, a supporting base 310, a limiting sleeve 311, a lifting screw 312, a supporting ground nail 313, a ventilation hole 314, an air supply pipe 315, an air supply hole 316, a docking pipe 317, a sealing sleeve 318, a connecting port 319 and a placement seat 320.

[0050] Several supporting steel pipes 301 are connected to the center of the inner side of the supporting steel plate 201. A placement seat 302 is welded at equal intervals in the middle of the outer side of the supporting steel pipe 301. A placement seat 320 is welded in the middle of one side of the reinforcing steel plate 215. A connecting frame 303 is fixed to the inside of the placement seat 302 and the placement seat 320 by bolts. An inner support rod 304 is welded to one end of the connecting frame 303. A threaded sleeve 305 is connected between two adjacent inner support rods 304 by threads. Connecting rings 306 are welded to both ends of the supporting steel pipe 301. Two adjacent supporting steel pipes 301 are connected by the connecting ring 306 and several bolts.

[0051] The bottom of the support steel pipe 301 at the bottom is connected to the support chassis 307 through a connecting ring 306 and bolts. Several limiting slide bars 308 are evenly welded on the bottom of the support chassis 307. A lifting threaded cylinder 309 is welded at the center of the bottom of the support chassis 307. The bottom of the lifting threaded cylinder 309 is connected to the support base 310. A limiting sleeve 311 is evenly welded at the position of the limiting slide bar 308 on the top of the support base 310. The limiting slide bar 308 is embedded in the limiting sleeve 311. A lifting screw 312 is rotatably installed at the center of the top of the support base 310. The lifting screw 312 is connected to the lifting threaded cylinder 309 through a thread. A supporting ground nail 313 is installed through the triangular position of the support base 310.

[0052] The outer side of the supporting steel pipe 301 is provided with a ventilation hole 314, and one side of the two horizontal rods 202 is welded with an air supply pipe 315. A plurality of air supply holes 316 are evenly opened on one side of the air supply pipe 315. A butt joint 317 is welded at the bottom of the air supply pipe 315. A closed sleeve 318 is connected to the outer side of the air supply pipe 315 by a thread. A connecting port 319 is opened on one side of the closed sleeve 318. When the device is connected and assembled longitudinally, the top butt joint 317 can be embedded in the inner top of the bottom air supply pipe 315, and the air supply pipes 315 are connected in pairs. When the excavated inspection well foundation pit is deep, rotate the closed sleeve 318 at the bottom of the foundation pit to align the connecting port 319 with the air supply hole 316, connect the air outlet end of the blower to the top of the top air supply pipe 315, and connect the exhaust end of the exhaust fan to the top of the top supporting steel pipe 301. Fresh air is transported by the blower and ejected from the air supply hole 316 into the bottom of the foundation pit. The original air inside the foundation pit enters the inside of the supporting steel pipe 301 through the ventilation hole 314 and is finally discharged through the exhaust fan.

[0053] The working principle and use process of the present invention are as follows: When the inspection well foundation pit is excavated, the foundation pit is first excavated to a depth that can assemble a layer of supporting steel plate 201, and the four supporting steel plates 201 are connected in sequence by connecting slide rods 205 and connecting slide grooves 206 to form a circular enclosure, and the fixed steel plate 218 is connected to the longitudinal connecting hole 217 on the topmost arc-shaped main rod 1 by bolts, and the adjusting steel plate 222 is fixedly connected to the adjusting frame 220 by bolts, and the fixed ground nails 227 are driven into the slope of the inspection well foundation pit. The topmost supporting steel plate 201 is fixed inside the soil, and the entire device is prevented from sinking when the subsequent detection well foundation pit is excavated. At the same time, the position of the adjusting steel plate 222 corresponding to the adjusting frame 220 is adjusted according to the height of the detection well foundation pit slope, and is fixed with positioning bolts 224, so that the tripod 226 can be fixed on foundation pit slopes of different heights. The scope of application is wide, and the supporting steel plate 201 inside the foundation pit can be effectively fixed by the fixing rod 225, making the internal support more stable;

[0054] After the first layer of supporting steel plates 201 is installed, the inspection well foundation pit is excavated again to make the space inside the inspection well foundation pit suitable for installing the second layer of supporting steel plates 201. The second layer of supporting steel plates 201 is located below the first layer of supporting steel plates 201. The second layer of supporting steel plates 201 is connected by connecting slide bars 205 and connecting slide grooves 206. The first layer and the second layer of arc main rods 1 are connected by bolts and longitudinal connecting holes 217 to complete the assembly of the second layer of supporting steel plates 201.

[0055] After the first layer of supporting steel plate 201 and the second layer of supporting steel plate 201 are installed, the side connection seat 212 and the connecting rod 213 are connected and fixed using bolts and two adjacent side connection holes 211, and the reinforcing steel plate 215 is connected using bolts, fixing ears 214 and shaped sleeves 216;

[0056] Repeat the above steps to sequentially excavate the foundation pit and install the supporting steel plates 201 to the bottom of the foundation pit. Then, remove the adjusting frame 220, the adjusting steel plates 222, and the tripod 226, so that the bottom supporting steel plates 201 fall down and touch the bottom of the pit, preventing the adjusting frame 220, the adjusting steel plates 222, and the tripod 226 from obstructing subsequent construction. The installation of multiple layers of supporting steel plates 201 and the reinforcing steel plates 215 is completed. The supporting steel plates 201 are connected layer by layer to isolate the side walls of the foundation pit, thereby preventing soil blocks and stones on the side walls of the foundation pit from injuring the workers inside the foundation pit and ensuring the personal safety of the workers.

[0057] The transverse rods 202, longitudinal rods 203 and diagonal braces 204 can effectively support the arc-shaped main rod 1. The overall support device forms a lattice ring skeleton with a ring-shaped plane. The ring makes each rod of the device bear the force on the axis. The rod is slender and the entire device is light. It can be hoisted and installed with a small machine, which is convenient and fast. In addition, the shape of the connection of the same layer of reinforced steel plates 215 forms a regular octagon with a reasonable cross-sectional form. It has the advantages of light weight and high bearing capacity. The octagon is highly symmetrical, which helps to evenly distribute external forces and reduce local stress concentration, thereby improving overall stability and further increasing support strength.

[0058] When the excavated foundation pit has a large diameter and a deep depth, the reinforced inner support assembly 3 is used, and the inner support rod 304 and the threaded sleeve 305 are installed at the top position of the foundation pit. The inner support rod 304 and the threaded sleeve 305 do not hinder the workers from constructing. When the excavated foundation pit has a small diameter and a shallow depth, there is no need to use the reinforced inner support assembly 3. When the supporting steel plate 201 is about to bear a large pressure, the supporting steel pipe 301 is connected by bolts in combination with the connecting ring 306. The connected supporting steel pipe 301 is placed in the center of the foundation pit so that the first seat 302 is flush with the corresponding second seat 320. The threaded sleeve is used to tighten the screwdriver. The tube 305 connects the two inner support rods 304. After the connection is completed, the connection frames 303 at both ends are placed inside the first placement seat 302 and the second placement seat 320 respectively and fixed with bolts. The bottom of the bottom support steel pipe 301 is connected to the support chassis 307 by bolts. The lifting screw 312 is rotated. Under the limiting action of the limiting slide bar 308, the limiting sleeve 311 moves along the limiting slide bar 308 until the support base 310 is in close contact with the bottom surface of the foundation pit, and the support base 310 is fixed with the supporting ground nails 313 to achieve the fixation of the support steel pipe 301.

[0059] The threaded sleeve 305 can be adjusted according to the distance between the first 302 and the second 320 placed on the same layer, and has a wide range of adaptability. Under the connection between the inner support rod 304 and the threaded sleeve 305, the support steel plate 201 is further strengthened, so that the pressure resistance of the entire device is higher and the support effect is better. The horizontal and vertical connections of the entire device are all bolted, which makes the installation speed fast and can be reused after the construction is completed, effectively reducing the project cost.

[0060] When the device is connected and assembled longitudinally, the top butt joint 317 can be embedded in the inner top of the bottom air supply pipe 315, and the air supply pipes 315 are connected in pairs in sequence. When the depth of the excavated inspection well foundation pit is deep, the closed sleeve 318 located at the bottom of the foundation pit is rotated to align the connecting port 319 with the air supply hole 316, and the air outlet end of the blower is connected to the top of the top air supply pipe 315, and the exhaust end of the exhaust fan is connected to the top of the top supporting steel pipe 301. Fresh air is transported by the blower and ejected from the air supply hole 316 to the bottom of the foundation pit. The original air inside the foundation pit enters the inside of the supporting steel pipe 301 through the air exchange hole 314 and is finally discharged through the exhaust fan, thereby realizing the circulation of the air inside the foundation pit, helping to remove the heat in the inspection well foundation pit, improving the air quality, and ensuring the health of the staff.

[0061] After the support device is installed, bricks are laid or molds are installed to pour concrete inside the supporting steel plate 201. After the construction is completed, the support device is moved out of the foundation pit using lifting equipment and disassembled layer by layer. After disassembly, the soil is backfilled into the gap between the brick wall and the foundation pit or between the concrete wall and the foundation pit.

[0062] Finally, it should be noted that the above description is merely a preferred embodiment 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 will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An assembled reverse-type annular support device for a manhole foundation pit, comprising an arc-shaped main rod (1), characterized in that: On one side of the arc-shaped main rod (1), a convenient support component (2) is provided, and the convenient support component (2) includes a support steel plate (201); A support steel plate (201) is welded between two arc-shaped main rods (1) on the same side, and a number of transverse rods (202) are welded between adjacent arc-shaped main rods (1). Vertical rods (203) are perpendicularly welded between the two ends of adjacent transverse rods (202), and diagonal braces (204) are obliquely welded between adjacent transverse rods (202); Side connection holes (211) are provided at the top and bottom of a number of vertical rods (203). Adjacent side connection holes (211) are connected by bolts to side connection seats (212). A connecting rod (213) is connected between adjacent side connection seats (212). Fixed ears (214) are welded on both sides of the connecting rod (213). A reinforcing steel plate (215) is connected between the two fixed ears (214) through a U-shaped sleeve (216), and the fixed ears (214) and the U-shaped sleeve (216) are connected by bolts; Longitudinal connection holes (217) are provided on both sides at the top of the arc-shaped main rod (1). A fixed steel plate (218) is connected to the top of the longitudinal connection hole (217) at the topmost position. The two mutually fitting arc-shaped main rods (1) are connected by bolts and longitudinal connection holes (217); An enhanced inner support component (3) is provided inside the support steel plate (201), and the enhanced inner support component (3) includes a support steel pipe (301); A number of support steel pipes (301) are connected to the center inside the support steel plate (201). Placement seats one (302) are welded at equal intervals in the middle on the outer side of the support steel pipe (301). A placement seat two (320) is welded in the middle on one side of the reinforcing steel plate (215). A connection frame (303) is fixed inside the placement seat one (302) and the placement seat two (320) by bolts. An inner support rod (304) is welded at one end of the connection frame (303). A threaded sleeve (305) is connected between adjacent inner support rods (304) by threads. Connection rings (306) are welded at both ends of the support steel pipe (301). Adjacent support steel pipes (301) are connected by connection rings (306) and a number of bolts; The bottom of the support steel pipe (301) located at the bottom is connected to a support chassis (307) through a connecting ring (306) and bolts, and a plurality of limiting slides (308) are evenly welded on the bottom of the support chassis (307), and a lifting threaded cylinder (309) is welded at the center of the bottom of the support chassis (307), and the bottom of the lifting threaded cylinder (309) is connected to a support base (310), and a limiting sleeve (311) is evenly welded at the top of the support base (310) corresponding to the position of the limiting slide (308), and the limiting slide (308) is embedded in the limiting sleeve (311), and a lifting screw (312) is rotatably installed at the center of the top of the support base (310), and the lifting screw (312) is connected to the lifting threaded cylinder (309) by a thread, and a supporting ground nail (313) is installed through the triangular position of the support base (310).

2. The assembled reverse-type annular support device for a manhole foundation pit according to claim 1 is characterized in that: A fixing seat (219) is welded to the top of the fixing steel plate (218), an adjusting frame (220) is fixed to the top of the fixing seat (219) by bolts, an adjusting steel plate (222) is connected to the inside of the adjusting frame (220), a fixing rod (225) is welded to one end of the bottom of the adjusting steel plate (222), a tripod (226) is welded to the top of the fixing rod (225), and a fixing ground nail (227) is installed through the triangular position of the tripod (226).

3. The assembled reverse-type annular support device for a manhole foundation pit according to claim 1 is characterized in that: A connecting slide rod (205) is welded to one end of the arc-shaped main rod (1), and a connecting slide groove (206) is welded to the other end of the arc-shaped main rod (1). The arc-shaped main rods (1) are connected in pairs via the connecting slide rods (205) and the connecting slide grooves (206). The connecting slide rods (205) are embedded in adjacent connecting slide grooves (206). Rubber pads (207) are bonded to both ends of the supporting steel plate (201).

4. The assembled reverse-type annular support device for a manhole foundation pit according to claim 3 is characterized in that: The cross section of the connecting slide bar (205) is T-shaped, and the connecting slide bar (205) fits tightly inside the adjacent connecting slide groove (206). The outer side of the connecting slide bar (205) and the inner side of the connecting slide groove (206) are both smooth surfaces.

5. The assembled reverse-type annular support device for a manhole foundation pit according to claim 1 is characterized in that: Pressure relief ports (208) are provided at equal intervals on the outside of the support steel plate (201), a pressure relief door (228) is hinged inside the pressure relief port (208), connecting ears (209) are welded on both sides of the pressure relief port (208) and the pressure relief door (228), and connecting bolts (210) are connected between two adjacent connecting ears (209).

6. The assembled reverse-type annular support device for a manhole foundation pit according to claim 2 is characterized in that: A plurality of positioning outer holes (221) are formed at equal intervals on both sides of the adjustment frame (220), a plurality of positioning inner holes (223) are formed at equal intervals on one side of the adjustment steel plate (222), and positioning bolts (224) are connected between the two positioning outer holes (221) and the two positioning inner holes (223).

7. The assembled reverse-type annular support device for a manhole foundation pit according to claim 1 is characterized in that: A ventilation hole (314) is provided on the outside of the supporting steel pipe (301), an air supply pipe (315) is welded to one side of the two transverse rods (202), a plurality of air supply holes (316) are evenly provided on one side of the air supply pipe (315), a butt joint pipe (317) is welded to the bottom of the air supply pipe (315), a closed sleeve (318) is connected to the outside of the air supply pipe (315) by means of a thread, and a communication port (319) is provided on one side of the closed sleeve (318).

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