Large component sinking well construction method for sewage treatment

Abstract

The application discloses a large component sinking well construction method for sewage treatment, which comprises the following steps: S1, foundation pit pretreatment: excavating a sinking well construction foundation pit and laying a cushion layer at the bottom of the pit; S2, erecting a formwork at a preset position in the foundation pit to cast a component, forming a prefabricated well shaft, and curing until the design strength; and S3, evenly distributing an auxiliary sinking assembly between the outer periphery of the well shaft and the foundation pit wall, wherein each auxiliary sinking assembly comprises a base, a buffer cylinder, a water tank and a water pump; the buffer cylinder, the water tank and the water pump are all installed at the top end of the base, the bottom of the buffer cylinder is provided with an electric control valve in communication, the other end of the electric control valve is connected with the water tank, the water tank is filled with a fluid medium, the input end of the water pump is connected with the water tank, and the output end of the water pump is connected with the buffer cylinder; the sinking speed is adjusted through the auxiliary sinking assembly, the inclination is monitored in real time and the deviation is corrected quickly through a pull rope and a touch switch, the support assembly is self-adapted to the outer wall of the sinking well and is convenient to reset, and the safety, stability and efficiency of large sinking well construction are comprehensively ensured.

Description

Technical Field

[0001] This invention relates to the field of caisson construction technology, specifically a method for constructing large-scale component caissons for sewage treatment. Background Technology

[0002] In wastewater treatment projects, large caissons serve as core structures, and their construction quality and efficiency directly impact the overall project progress. Currently, the mainstream caisson construction methods are divided into two categories: dewatering sinking and non-dewatering sinking. Although widely used, key technical bottlenecks remain for large and heavy caissons, making it difficult to meet the demands for high precision and high safety in construction.

[0003] Currently, the sinking speed of caissons mainly relies on manual adjustment. During dewatering sinking, the speed is controlled by adjusting the amount of excavated soil and the discharge rate of the drainage pump; during non-dewatering sinking, the speed is controlled by adjusting the soil removal frequency and the suction power of the sludge suction machine. This method has a significant lag, with a long interval between manual observation and operational adjustments. When encountering heterogeneous soil layers, it is prone to "sudden sinking" or "slow sinking." Excessive sinking may cause the soil at the cutting edge to be hollowed out, leading to well tilting and cracking of the cutting edge.

[0004] Current tilt monitoring mainly relies on "periodic observation + manual judgment." Construction workers periodically measure the elevation and verticality of the caisson using instruments. Once tilting is detected, it needs to be corrected through additional excavation, counterweight adjustment, or lateral jacking. This method has the problem of non-real-time monitoring. It is difficult to detect slight tilting of the caisson in time. By the time it is detected, the tilt has accumulated, and correction requires stopping the operation, which is time-consuming and may cause cracks in the well wall. In addition, it relies too much on the experience of personnel. Summary of the Invention

[0005] The purpose of this invention is to provide a construction method for large-scale component caissons used in sewage treatment, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a construction method for a large component caisson for sewage treatment, comprising the following steps:

[0007] S1. Foundation pit pretreatment: Excavate the foundation pit for caisson construction and lay a cushion layer at the bottom of the pit;

[0008] S2. Build formwork and pour components at the preset location in the foundation pit to form a precast well cylinder, and cure it to the design strength;

[0009] S3, distribute auxiliary sinking components between the wellbore outer wall and the foundation pit wall, each auxiliary sinking component includes a base, a buffer cylinder, a water tank and a water pump; the buffer cylinder, the water tank and the water pump are all installed on the top of the base, and the bottom of the buffer cylinder is provided with a communication electric control valve, the other end of the electric control valve is connected with the water tank, the water tank is filled with fluid medium, the input end of the water pump is connected with the water tank, and the output end is connected with the buffer cylinder; a sealing block is slidably arranged in the buffer cylinder, the top end of the sealing block is connected with a support column, and the top end of the support column is provided with an adjustable support assembly, which dynamically abuts against the outer wall of the wellbore;

[0010] S4, remove the bottom pad layer, dig and sink, adjust the opening degree of the electric valve to control the sinking speed, and pause the work every certain distance, monitor the inclination and correct the deviation;

[0011] S5, clean the base after the sinking well is in place, and pour the underwater concrete bottom sealing layer.

[0012] Further, the support assembly comprises a support seat and an arc-shaped pressing block, the top end of the buffer cylinder is provided with a guide rod upward at each corner, a corresponding sliding hole is formed in the support seat, and the support seat slides up and down along the guide rod; the middle part of the arc-shaped pressing block is hingedly assembled to one end of the support seat close to the wellbore, the other side of the support seat is hingedly provided with a telescopic cylinder, and the piston rod of the telescopic cylinder is hingedly connected with the top end of the arc-shaped pressing block, so that the telescopic cylinder piston rod drives the arc-shaped pressing block to rotate around the middle hinge point, and the arc-shaped pressing block and the outer wall of the sinking well are pressed tightly.

[0013] Further, the lower surface of the arc-shaped pressing block is provided with anti-skid lines, a through hole is formed in the middle of the lower end of the arc-shaped pressing block, a resisting block is hingedly connected in the through hole, a torsion spring is connected between the resisting block and the side wall of the through hole, a recess is formed in the outer end face close to the resisting block, and a plurality of rubber pieces are equidistantly distributed in the recess.

[0014] Further, mounting holes are formed in the left and right ends of the support seat, a rotating rod is arranged outside the mounting holes on the left and right sides, a wire reel is rotatably arranged in the mounting hole on one side, a wire is wound on the wire reel, a hand wheel connected with the wire reel is arranged at the top end of the support seat, a fixed column is arranged in the mounting hole on the other side, a bayonet is formed in the fixed column, and a corresponding clamping block is arranged at the end of the wire; a touch switch is arranged at the upper and lower ends of the mounting holes on the left and right sides, and the touch switch is electrically connected with an alarm; the wire is horizontally straightened and extended to be clamped with the fixed column on the adjacent side.

[0015] Further, a speed measuring sensor is installed on the support seat, and the speed measuring sensor is electrically connected with the electric control valve through a processor; the actual sinking speed is calculated and fed back to the processor by collecting the displacement change data of the open caisson in real time; the processor compares the actual sinking speed with the preset target sinking speed range; if the actual sinking speed is greater than the upper limit of the target range, the opening of the electric control valve is reduced; if the actual sinking speed is less than the lower limit of the target range, the opening of the electric control valve is increased.

[0016] Further, a plurality of speed reduction mechanisms are distributed between the outer periphery of the well shaft and the foundation pit wall, the speed reduction mechanism comprises an adjusting seat and a rubber friction wheel, a lead screw and a sliding rail are arranged on the adjusting seat, a sliding seat is arranged on the sliding rail, and the sliding seat is threadedly connected with the lead screw, the lead screw is driven to rotate by a first motor, and the rubber friction wheel is assembled on the sliding seat and driven to rotate by a second motor.

[0017] Further, a return spring is connected between the lower end of the sealing block and the bottom end of the buffer cylinder, and a control valve is arranged on the connecting pipeline of the water pump and the buffer cylinder.

[0018] Further, a pressure sensor array is embedded in the arc-shaped pressing block of the support assembly, and the telescopic cylinder is a servo electric cylinder; the processor adjusts the telescopic cylinder in real time according to the pressure distribution data of each arc-shaped pressing block, so that the contact pressure of the arc-shaped pressing block and the well shaft wall is uniformized.

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

[0020] 1、The present application has simple structure and reasonable design, and through the cooperation of the support assembly and the buffer cylinder, the fluid medium in the buffer cylinder and the electric control valve work together, and the processor compares the actual speed with the preset range: when the sinking is too fast, the opening of the electric control valve is reduced, the "water cushion resistance" is formed in the buffer cylinder, and the braking is formed through the support structure to the well shaft, so that the tilting risk caused by out-of-control speed is avoided; when the sinking is too slow, the opening of the electric control valve is increased to weaken the resistance, and the natural acceleration is realized by the self-weight of the well shaft and the effect of earth excavation; at the same time, the rubber friction wheel of the speed reduction mechanism can further assist, and the speed is stably ensured in the safe range, so that the pain point of "speed control difficulty" of the traditional open caisson is solved, and the structural deformation or delay of construction period caused by abnormal speed is reduced.

[0021] 2、The present application constructs a real-time inclination monitoring system through the cooperative design of the horizontally tensioned pull rope between the support seats, the touch switch and the alarm. When sinking normally, the pull rope remains in a horizontally tensioned state. If the shaft is inclined due to uneven soil, the sinking speed difference of the two sides of the support seat will cause the pull rope to be inclined, the touch switch at the upper and lower ends is touched and the audible and light alarm is triggered, and the operator can pause the operation and correct the deviation in time. After correction, the operation can be quickly restored by adjusting the pull rope through the hand wheel, without the need for complex debugging, effectively avoiding safety accidents such as shaft cracking and collapse caused by the expansion of inclination, and greatly improving the safety redundancy of the sinking well construction.

[0022] 3、The structural design of the support assembly fully considers the adaptability and protection of the shaft outer wall: the anti-skid pattern of the arc-shaped pressing block, the torsional spring self-adaptive structure of the stop block (which can fit the small concave-convex of the shaft), the friction enhancement and buffering effect of the rubber sheet, the three designs ensure that the support assembly is closely fitted with the shaft outer wall and synchronously moves downward, avoiding the relative sliding to affect the speed control accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic view of the present application;

[0024] Figure 2 It is a top view of the present application;

[0025] Figure 3 It is a structural schematic view of the auxiliary sinking assembly of the present application;

[0026] Figure 4 It is a structural schematic view of the stop block of the present application;

[0027] Figure 5 It is a front view of the pull rope of the present application;

[0028] Figure 6 It is a side view of the support assembly of the present application;

[0029] Figure 7 It is a structural schematic view of the speed reduction mechanism of the present application.

[0030] In the figure, base-1, buffer cylinder-2, water tank-3, water pump-4, electric control valve-5, sealing block-6, support column-7, support assembly-8, support seat-9, arc-shaped pressing block-10, guide rod-11, telescopic cylinder-12, stop block-13, groove-14, rubber sheet-15, mounting port-16, rotating rod-17, wire wheel-18, pull rope-19, hand wheel-20, fixed column-21, bayonet-22, clamping block-23, touch switch-24, speed reduction mechanism-25, adjusting seat-26, rubber friction wheel-27, lead screw-28, sliding rail-29, sliding seat-30, return spring-31, shaft-32, auxiliary sinking assembly-33. DETAILED DESCRIPTION

[0031] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0032] As shown in the drawings, Figures 1-7 A large component caisson construction method for sewage treatment comprises the following steps:

[0033] S1, foundation pit pretreatment: excavate the caisson construction foundation pit, and lay a cushion on the pit bottom;

[0034] S2, cast the component at a preset position in the foundation pit to form a prefabricated shaft 32, and maintain to the design strength;

[0035] S3, evenly distribute auxiliary sinking assemblies 33 between the outer periphery of the shaft 32 and the foundation pit wall, each auxiliary sinking assembly 33 comprising a base 1, a buffer cylinder 2, a water tank 3, and a water pump 4; the buffer cylinder 2, the water tank 3, and the water pump 4 are all installed on the top end of the base 1, and the bottom of the buffer cylinder 2 is provided with an electric control valve 5 in communication, the other end of the electric control valve 5 is connected with the water tank 3, the water tank 3 is filled with a fluid medium, the input end of the water pump 4 is connected with the water tank 3, and the output end is connected with the buffer cylinder 2, a return spring 31 is connected between the lower end of a sealing block 6 and the bottom end of the buffer cylinder 2, and a control valve is arranged on the connecting pipeline of the water pump 4 and the buffer cylinder 2; the sealing block 6 is slidably arranged in the buffer cylinder 2, the top end of the sealing block 6 is connected with a support column 7, the top end of the support column 7 is provided with an adjustable support assembly 8, and the support assembly 8 dynamically abuts against the outer wall of the shaft 32;

[0036] The base 1 serves as the installation base of the entire assembly, is fixed at a preset position between the foundation pit wall and the shaft 32, bears all the loads of the buffer cylinder 2, the water tank 3, the water pump 4, and the support assembly 8, ensures the position stability of the assembly during the sinking of the caisson, and avoids affecting the control precision due to force deviation

[0037] S4, after removing the bottom cushion, excavate and sink, adjust the opening degree of the electric valve to control the sinking speed, pause the work every certain distance of sinking, monitor the inclination, and correct the deviation;

[0038] S5, after the caisson is in place, clean the foundation, and pour the underwater concrete to seal the bottom layer.

[0039] In the embodiment, the support assembly 8 comprises a support base 9 and an arc-shaped pressing block 10, the top end of the buffer cylinder 2 is provided with a guide rod 11 at each of the four corners, the support base 9 is provided with a corresponding sliding hole, and the support base 9 slides up and down along the guide rod 11; the middle part of the arc-shaped pressing block 10 is hingedly assembled to one end of the support base 9 close to the shaft 32, the other side of the support base 9 is hingedly provided with a telescopic cylinder 12, the piston rod of the telescopic cylinder 12 is hingedly connected to the top end of the arc-shaped pressing block 10, so that the arc-shaped pressing block 10 is driven to rotate around the middle hinge point by the extension and retraction of the piston rod of the telescopic cylinder 12, and the pressing between the arc-shaped pressing block 10 and the outer peripheral wall of the open caisson is realized.

[0040] The guide rod 11 at the top end of the buffer cylinder 2 limits the support base 9 to only slide vertically (consistent with the sinking direction of the shaft 32), so as to avoid the horizontal deviation of the support base 9 due to the inclination of the shaft 32 or the lateral force, and ensure that the support force always acts on the shaft 32 in the radial direction;

[0041] In the embodiment, the lower surface of the arc-shaped pressing block 10 is provided with an anti-skid pattern, the lower end of the arc-shaped pressing block is provided with a through hole, a stop block 13 is hingedly connected in the through hole, a torsion spring is connected between the stop block 13 and the side wall of the through hole, the stop block 13 is provided with a groove 14 close to the outer end face, and a plurality of rubber pieces 15 are equidistantly distributed in the groove 14.

[0042] In work, the piston rod of the telescopic cylinder 12 is retracted, the arc-shaped pressing block 10 is driven to rotate around the middle hinge point, so that the lower part of the arc-shaped pressing block 10 is attached to the outer wall of the shaft 32 and is pressed against, the anti-skid pattern on the lower part of the arc-shaped pressing block 10 increases the static friction force with the outer wall of the shaft 32, and the relative sliding between the support assembly 8 and the shaft 32 is prevented; the stop block 13 in the through hole is elastically hinged through the torsion spring, can adapt to the slight concave-convex or deformation of the outer wall of the shaft 32, and ensures the local close contact; the rubber pieces 15 in the groove 14 of the stop block 13 further enhance the friction coefficient, and at the same time buffer the instantaneous fluctuation of the support force through elastic deformation.

[0043] By adjusting the pressing degree of the arc-shaped pressing block 10 and the stop block 13 and the outer wall of the shaft 32, when the shaft 32 sinks, the support assembly 8 can be synchronously lowered with the shaft 32, and the sealing block 6 connected to the lower end of the support column 7 can be synchronously lowered along the inner wall of the buffer cylinder 2. At this time, the fluid medium (water) below the sealing block 6 in the buffer cylinder 2 needs to be discharged to the water tank 3 through the electric control valve 5 at the bottom, so as to allow the sealing block 6 to sink synchronously with the shaft 32;

[0044] If the sinking speed of the wellbore 32 is too fast (exceeding the preset target range), the processor will control the electric control valve 5 to reduce the opening degree, at this time the water discharge speed in the buffer cylinder 2 is slow, and is less than the descending speed of the sealing block 6 (with the wellbore 32). The water below the sealing block 6 is accumulated due to the slow discharge, and an upward reaction force (equivalent to "water cushion resistance") is generated on the sealing block 6, which hinders the sealing block 6 from continuing to descend; the resistance is transmitted to the outer wall of the wellbore 32 through the support column 7 and the support assembly 8, forming a "braking resistance" to the sinking of the wellbore 32, forcing the wellbore 32 to slow down until the sinking speed matches the water discharge.

[0045] If the sinking speed of the wellbore 32 is too slow (lower than the preset target range), the processor controls the electric control valve 5 to increase the opening degree, and the water discharge speed is accelerated to keep pace with (or slightly faster than) the descending speed of the sealing block 6. There is no obvious water accumulation below the sealing block 6, and the upward reaction force is reduced. The resistance of the support assembly 8 to the wellbore 32 is weakened, and the wellbore 32 can naturally accelerate under the action of gravity and soil excavation.

[0046] And after the wellbore 32 descends for a distance, the support seat 9 cannot continue to descend when it descends to the top end of the buffer cylinder 2. At this time, the piston rod of the telescopic cylinder 12 extends outward, so that the arc-shaped pressing block 10 is separated from the cylinder wall. Then the control valve is opened, and the water pump 4 pumps the water in the box into the buffer cylinder 2, so that the support seat 9 is reset to the uppermost side under the action of the inflowing water and the reset spring 31. Then the telescopic cylinder 12 drives the arc-shaped pressing block 10 to re-engage, so that the work can continue.

[0047] In this embodiment, the left and right ends of the support seat 9 are provided with mounting holes 16, and the outer sides of the mounting holes 16 on both sides are provided with rotating rods 17. One side of the mounting hole 16 is rotatably provided with a wire wheel 18, the wire wheel 18 is wound with a pull rope 19, and the top end of the support seat 9 is provided with a hand wheel 20 connected with the wire wheel 18. The other side of the mounting hole 16 is provided with a fixed column 21, the fixed column 21 is provided with a clamping hole 22, and the end of the pull rope 19 is provided with a corresponding clamping block 23. The mounting holes 16 on both sides are provided with touch switches 24 at the upper and lower ends, and the touch switches 24 are electrically connected with the alarm.

[0048] During installation, the pull rope 19 can be retracted by rotating the hand wheel 20, and one end of the pull rope 19 is pulled away and clamped to the fixed column 21 on the adjacent support seat 9 through the clamping block 23 and the clamping hole 22. Then the pull rope 19 is wound to make the pull rope 19 in a horizontal tension state (perpendicular to the sinking direction of the wellbore 32), at this time the pull rope 19 is neither slack nor drooping, and the height of the pull rope 19 keeps a distance (not in contact) with the touch switches 24 at the upper and lower ends of the mounting holes 16 on both sides, and the alarm is in standby state.

[0049] When the well shaft 32 is sinking vertically and uniformly, each support seat 9 moves vertically synchronously with the well shaft 32 (the sinking speed is consistent), and the horizontal tension of the pull rope 19 remains unchanged; when the well shaft 32 is tilted due to uneven soil or unbalanced force, the sinking speed of the two side support seats 9 is different (one side is faster and the other side is slower), which destroys the horizontal tension state of the pull rope 19, and the specific performance is as follows:

[0050] If the well shaft 32 tilts to one side (for example, the left side sinks faster than the right side), the sinking distance of the left side support seat 9 is greater than that of the right side, and the vertical height difference between the two side support seats 9 is formed: the left side support seat 9 is lower, and the right side support seat 9 is higher. The pull rope 19 connecting the two will tilt due to excessive sinking on the left side. The tilted pull rope 19 will touch the touch switch 24, and no matter which end of the touch switch 24 is touched, the switch will immediately send an electrical signal to the alarm, trigger the alarm to sound and light, and prompt the operator that the well shaft 32 has tilted and the operation needs to be paused and corrected.

[0051] When the operator completes the correction of the well shaft 32, the vertical height difference between the two side support seats 9 disappears, at which time the line wheel 18 can be rotated by the hand wheel 20 to re-tension the pull rope 19, so that it returns to the horizontal tension state (maintains a distance from the touch switch 24), the alarm stops alarming, and the sinking well can continue to sink.

[0052] In the embodiment, a speed measuring sensor is installed on the support seat 9, and the speed measuring sensor is electrically connected with the electric control valve 5 through a processor; by collecting the displacement change data of the sinking well in real time, the actual sinking speed is calculated and fed back to the processor; the processor compares the actual sinking speed with the preset target sinking speed range: if the actual sinking speed is greater than the upper limit of the target range, the electric control valve 5 is controlled to reduce the opening; if the actual sinking speed is less than the lower limit of the target range, the electric control valve 5 is controlled to increase the opening.

[0053] In the embodiment, a plurality of speed reduction mechanisms 25 are also distributed between the outer periphery of the well shaft 32 and the foundation pit wall, the speed reduction mechanism 25 includes an adjusting seat 26 and a rubber friction wheel 27, the adjusting seat 26 is provided with a lead screw 28 and a sliding rail 29, the sliding rail 29 is provided with a sliding seat 30, and the sliding seat 30 is threadedly connected with the lead screw 28, the lead screw 28 is driven to rotate by a first motor, and the rubber friction wheel 27 is assembled on the sliding seat 30 and driven to rotate by a second motor;

[0054] The first motor drives the screw rod 28 to rotate, and the sliding seat 30 moves along the slide rail 29, so that the rubber friction wheel 27 contacts the outer wall of the wellbore 32; the second motor drives the rubber friction wheel 27 to rotate, when the sinking speed of the wellbore 32 is too fast, the friction force between the rubber and the outer wall of the wellbore 32 generates a reverse resistance to the wellbore 32, further slowing down the sinking speed (especially when the sinking speed is too fast, cooperating with the electric control valve 5 to enhance the deceleration effect), improving the reliability of the lifting speed control, on the contrary, if the sinking speed of the wellbore 32 is too slow, the rubber friction wheel 27 rotates in the positive direction, generating a downward thrust.

[0055] In the embodiment, the arc-shaped pressing blocks 10 of the support assembly 8 are embedded with a pressure sensor array, and the telescopic cylinders 12 are servo electric cylinders; the processor adjusts the telescopic cylinders 12 in real time according to the pressure distribution data of each arc-shaped pressing block 10, so that the contact pressure of the arc-shaped pressing blocks 10 and the wall of the wellbore 32 is homogenized.

[0056] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of sinking a large member caisson for sewage treatment, characterized by, It comprises the following steps: S1, foundation pit pretreatment: excavate the construction foundation pit of the open caisson, lay the cushion on the pit bottom; S2, cast the components at the preset position in the foundation pit to form the prefabricated shaft, and maintain to the design strength; S3, evenly distribute the auxiliary sinking assembly between the shaft periphery and the foundation pit wall, each auxiliary sinking assembly comprises a base, a buffer cylinder, a water tank and a water pump; the buffer cylinder, the water tank and the water pump are all installed on the top end of the base, and the bottom of the buffer cylinder is provided with an electric control valve in communication, the other end of the electric control valve is connected with the water tank, the water tank is filled with fluid medium, the input end of the water pump is connected with the water tank, and the output end is connected with the buffer cylinder; a sealing block is slidably arranged in the buffer cylinder, the top end of the sealing block is connected with a support column, the top end of the support column is provided with an adjustable support assembly, and the support assembly is dynamically abutted with the outer wall of the shaft; S4, remove the bottom cushion and dig soil to sink, and control the sinking speed by adjusting the opening degree of the electric valve, and pause the work every certain distance, monitor the inclination and correct the deviation; S5, clean the base after the sinking well is in place, and pour the underwater concrete bottom sealing layer.

2. The large member caisson construction method for sewage treatment according to claim 1, characterized by: The support assembly comprises a support seat and an arc-shaped pressing block, the top end of the buffer cylinder is provided with a guide rod upward at each corner, a corresponding sliding hole is formed in the support seat, and the support seat slides up and down along the guide rod; the middle part of the arc-shaped pressing block is hingedly assembled to one end of the support seat close to the shaft, the other side of the support seat is hingedly provided with a telescopic cylinder, and the piston rod of the telescopic cylinder is hingedly connected with the top end of the arc-shaped pressing block, so that the telescopic cylinder piston rod drives the arc-shaped pressing block to rotate around the middle hinge point, and the arc-shaped pressing block and the outer peripheral wall of the sinking well are pressed.

3. The large member caisson construction method for sewage treatment according to claim 2, characterized by: The lower surface of the arc-shaped pressing block is provided with anti-skid lines, the lower end of the arc-shaped pressing block is provided with a through hole in the middle part, a block is hingedly connected in the through hole, a torsion spring is connected between the block and the side wall of the through hole, a recess is formed in the outer end face close to the block, and a plurality of rubber pieces are equidistantly distributed in the recess.

4. The large member caisson construction method for sewage treatment according to claim 2, characterized by: The left and right ends of the support seat are both provided with mounting holes, the outer sides of the mounting holes on the two sides are both provided with rotating rods, a wire wheel is rotatably arranged in one of the mounting holes, a pull rope is wound on the wire wheel, and a hand wheel connected with the wire wheel is arranged at the top end of the support seat; a fixed column is arranged in the other mounting hole, a bayonet is formed in the fixed column, and a corresponding block is arranged at the end of the pull rope; touch switches are arranged at the upper and lower ends of the mounting holes on the two sides, and the touch switches are electrically connected with the alarm; the pull rope is horizontally straightened and extended to be clamped with the fixed column on the adjacent side.

5. The method of claim 2, wherein the method is characterized by: A speed measurement sensor is mounted on the support seat, and the speed measurement sensor is electrically connected with the electric control valve through a processor; the actual sinking speed is calculated by collecting the displacement change data of the sinking well in real time and fed back to the processor; the processor compares the actual sinking speed with the preset target sinking speed range: if the actual sinking speed is greater than the upper limit of the target range, the opening degree of the electric control valve is reduced; if the actual sinking speed is less than the lower limit of the target range, the opening degree of the electric control valve is increased.

6. The large member caisson construction method for sewage treatment according to claim 5, characterized by: Several speed reduction mechanisms are distributed between the wellbore periphery and the foundation pit wall, the speed reduction mechanism comprises an adjusting seat and a rubber friction wheel, a screw rod and a sliding rail are arranged on the adjusting seat, a sliding seat is arranged on the sliding rail, and the sliding seat is threadedly connected with the screw rod, the screw rod is driven to rotate by a first motor, and the rubber friction wheel is assembled on the sliding seat and driven to rotate by a second motor.

7. The method of claim 1, wherein the method is characterized by: A reset spring is connected between the lower end of the sealing block and the bottom end of the buffer cylinder, and a control valve is arranged on the connecting pipeline of the water pump and the buffer cylinder.

8. The method of claim 2, wherein the method is characterized by: The arc-shaped pressing blocks of the supporting assembly are embedded with a pressure sensor array, and the telescopic cylinders are servo electric cylinders; the processor adjusts the telescopic cylinders in real time according to the pressure distribution data of each arc-shaped pressing block, so that the contact pressure of the arc-shaped pressing blocks and the wellbore wall is homogenized.

Images