Automatic flood-prevention device for pipe-jacking working shaft

Abstract

Disclosed in the present invention is an automatic flood-prevention device for a pipe-jacking working shaft, the automatic flood-prevention device comprising a flood-prevention door and a water pumping system. The flood-prevention door comprises a door body, a door body opening and closing mechanism and a door body opening and closing control system. The door body comprises a steel plate door and a door body water-stop device fixed on an outer side surface of the steel plate door; the door body opening and closing mechanism comprises two opening and closing hydraulic cylinders symmetrically mounted on two sides above a cast-in-situ portal ring, two electric motors mounted on ends of piston rods of the two opening and closing hydraulic cylinders, and two large telescopic rods mounted on the rotating shafts of the two electric motors and in the middle of an inner side surface of the steel plate door; and the door body opening and closing control system comprises a water level monitor mounted at the bottom of an inner cavity of a jacking pipe and a door body controller mounted on the ground surface outside the pipe-jacking working shaft. The water pumping system comprises a water collection pit arranged at a bottom edge in the pipe-jacking working shaft, a water pump mounted in the water collection pit, and a water pump controller mounted on the ground surface outside the pipe-jacking working shaft. The present invention can effectively block a jacking portal quickly, safely and reliably.

Description

An automatic flood prevention device for pipe jacking shafts Technical Field

[0001] This invention relates to an automatic flood prevention device for pipe jacking wells. Background Technology

[0002] Pipe jacking construction, as a municipal water supply and drainage civil engineering construction method, can be divided into the jacking working shaft part and the pipe jacking part. The jacking working shaft is the working shaft for pipe jacking, which is the main working section. At the same time, the jacking working shaft is also the main operating space for equipment and personnel.

[0003] When the jacking shaft is located in an area with frequent rainy seasons, the jacking shaft may be flooded due to the influence of the natural environment. When the water in the jacking shaft flows back to the jacking machine head, it may cause the jacking machine to be corroded by water, resulting in mechanical short-heading and damage.

[0004] Traditional methods for preventing waterlogging in such situations primarily involve pumping water from inside the well and sealing the water externally. While this method reduces the risk of flooding to some extent, it requires significant manpower and resources for emergency response during heavy rainstorms, greatly hindering rescue efforts. Furthermore, in low-lying areas where pipe jacking construction is difficult due to ineffective rainwater drainage, manual entry into the well for sealing poses safety risks. This method also suffers from slow speed and an insufficiently rapid response mechanism, negatively impacting personnel escape and machinery safety. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art and provide an automatic anti-flooding device for pipe jacking working shafts. It can fully guarantee the effective sealing of the jacking tunnel entrance, and has the characteristics of being fast, safe and reliable. It effectively prevents water in the pipe jacking working shaft from entering the jacking pipe and damaging the head of the pipe jacking machine.

[0006] The objective of this invention is achieved as follows: an automatic flood prevention device for a pipe jacking shaft, installed inside the pipe jacking shaft and including a flood prevention gate and a pumping system; the pipe jacking shaft uses a steel casing to form the shaft wall, and a jacking opening is formed on the lower part of the shaft wall on the side wall in the direction of pipe jacking; a cast-in-place opening ring with an inner diameter larger than the outer diameter of the jacking pipe is provided on the inner side of the shaft wall at the jacking opening position; a steel fitting ring with a limiting ring plate at the inner end is provided on the inner ring surface of the cast-in-place opening ring, allowing the jacking pipe to pass through the steel fitting ring; a water-stop ring with an inner diameter smaller than the outer diameter of the jacking pipe is installed on the inner side of the limiting ring plate of the steel fitting ring; wherein,

[0007] The floodgate includes a door body, a door body opening and closing mechanism, and a door body opening and closing control system;

[0008] The door body includes a steel plate door with a diameter larger than the inner diameter of the cast-in-place opening ring and a door body water-stopping device fixed on the outer side of the steel plate door. The door body water-stopping device includes a door body water-stopping ring and a ring of water-swellable agent pre-embedded on the outer side of the door body water-stopping ring. The ring of water-swellable agent is in contact with the opening water-stopping ring.

[0009] The gate opening and closing mechanism includes two hydraulic cylinders, two motors, and two large telescopic rods. The two hydraulic cylinders are installed on the inner side of the well wall and are symmetrically located on both sides above the cast-in-place opening ring. The two motors are installed one-to-one on the piston rod ends of the two hydraulic cylinders. The rear ends of the fixed sections of the two large telescopic rods are installed one-to-one on the rotating shaft ends of the two motors. The front ends of the movable sections of the two large telescopic rods are each hinged to the middle of the inner side of the steel plate gate through a pile head and are symmetrically located on both sides of the center of the steel plate gate.

[0010] The gate opening and closing control system includes a water level monitor and a gate controller. The water level monitor at the tunnel entrance is installed at the bottom of the inner cavity of the jacking pipe located within the steel fitting ring. The gate controller is installed on the ground surface outside the jacking shaft and is connected to the water level monitor at the tunnel entrance and the two hydraulic cylinders, two motors, and two telescopic rods of the gate opening and closing mechanism via signal lines. The gate controller controls the piston rods of the two hydraulic cylinders to extend and retract synchronously, controls the two motors to rotate synchronously in opposite directions, and controls the two large telescopic rods to extend and retract synchronously. A manual control switch is also provided on the gate controller.

[0011] The pumping system includes a sump located at the bottom edge of the jacking shaft and below one side of the cast-in-place opening ring, a pump installed in the sump, and a pump controller installed on the ground surface outside the jacking shaft. The pump controller is connected to the pump via a signal line.

[0012] The aforementioned automatic flood prevention device for the pipe jacking working well includes a gate waterstop ring, which is a stepped rubber waterstop ring with a boss on its outer side. The diameter of the bottom of the boss of the gate waterstop ring is larger than the outer diameter of the jacking pipe and smaller than the inner diameter of the steel mounting ring. The cross-section of the water-swellable agent is V-shaped and is pre-embedded on the outer side of the bottom of the boss of the gate waterstop ring.

[0013] The aforementioned automatic flood prevention device for the pipe jacking working shaft includes a gate opening and closing mechanism comprising two small telescopic rods. The rear ends of the fixed sections of the two small telescopic rods are respectively mounted on the rotating shafts of two motors, and the ends of the movable sections of the two small telescopic rods are respectively mounted on the fixed sections of two large telescopic rods, such that the angle between the small telescopic rods and the horizontal direction is no greater than 45°. Each of the two small telescopic rods is connected to the gate controller via a signal line.

[0014] The aforementioned automatic flood prevention device for the pipe jacking working well includes a concrete base slab at the bottom of the well wall; the bottom of the cast-in-place opening ring is connected to the concrete base slab via a concrete reinforcement seat that is poured synchronously with the cast-in-place opening ring; and a gravel cushion layer is also provided at the bottom of the concrete base slab.

[0015] The aforementioned automatic flood prevention device for the pipe jacking working well includes a gate limiting stake fixed on the well wall above the corresponding cast-in-place opening ring, with a length less than the thickness of the cast-in-place opening ring.

[0016] The automatic flood prevention device for the pipe jacking shaft of the present invention is characterized by:

[0017] 1. This invention adopts an automatic response mechanism based on water level monitoring. By detecting the water level, it identifies the risk of flooding in the pipe jacking working shaft and quickly activates the floodgate to automatically seal the jacking entrance, effectively preventing water in the pipe jacking working shaft from entering the jacking pipe and damaging the head of the pipe jacking machine.

[0018] 2. This invention uses a floodproof door to temporarily seal the jacking hole. The floodproof door covers the jacking hole by opening and closing a hydraulic cylinder. A door sealing device consisting of a rubber water-stop ring and a water-swellable agent is installed on the outer side of the floodproof door. The water pressure in the well and the opening and closing of the hydraulic cylinder press the door sealing device into close contact with the inner end face of the jacking hole, further ensuring the sealing and water-stopping effect of the floodproof door.

[0019] 3. This invention uses a water inlet sensor inside the jacking pipe and an alarm outside the well. The anti-flooding device can be manually activated, which can prevent personnel from entering the water-bearing well for operation and construction. Attached Figure Description

[0020] Figure 1 is an elevation view of the automatic flood prevention device (when the gate is open at the jacking entrance) of the pipe jacking working shaft of the present invention.

[0021] Figure 2 is a plan view of the gate water-stopping device in the automatic flood prevention device for the jacking well of the present invention;

[0022] Figure 3 is a plan view of the automatic flood prevention device of the present invention when the door closes the top opening;

[0023] Figure 4 is an elevation view of the automatic flood prevention device of the present invention when the door closes the top-entry opening;

[0024] Figure 5 is a side view of the automatic flood prevention device of the present invention (including two states: the door is open and the door is closed when the door is in the opening);

[0025] Figure 6 is an elevation view of the door in the automatic flood prevention device of the present invention during the movement process. Detailed Implementation

[0026] The invention will now be further described with reference to the accompanying drawings.

[0027] Please refer to Figures 1 to 6. The automatic flood prevention device for the pipe jacking working shaft of the present invention is installed inside the pipe jacking working shaft. The pipe jacking working shaft is formed by a steel casing to form the shaft wall 10. The bottom of the shaft wall 10 is provided with a concrete base slab 11, and the bottom of the concrete base slab 11 is provided with a crushed stone cushion layer 12. A jacking opening is opened on the side wall of the lower part of the shaft wall 10 in the direction of pipe jacking. A cast-in-place opening ring 13 with an inner diameter larger than the outer diameter of the jacking pipe 100 is provided on the inner side of the shaft wall 10 at the jacking opening position. The bottom of the cast-in-place opening ring 13 is also connected to the concrete base slab 11 via a synchronously cast concrete reinforcement seat 14. A steel mounting ring 15 with a limiting ring plate 150 at its inner end is provided on the inner ring surface of the cast-in-place opening ring 13, allowing the jacking pipe 100 to pass through the steel mounting ring 15. A water-stop ring 16 with an inner diameter smaller than the outer diameter of the jacking pipe 100 is installed on the inner side of the limiting ring plate 150 of the steel mounting ring 15 via a nut 160 pre-embedded in the cast-in-place opening ring 13. A gate limiting pile 17 with a length smaller than the thickness of the cast-in-place opening ring 13 is fixed above the well wall 10.

[0028] The automatic flood prevention device for the pipe jacking working shaft of the present invention includes a flood prevention gate and a pumping system.

[0029] The floodgate includes the gate body 2, the gate opening and closing mechanism, and the gate opening and closing control system.

[0030] The door body 2 includes a steel plate door 20 with a diameter larger than the inner diameter of the cast-in-place opening ring 13 and a door water-stop device fixed on the outer side of the steel plate door 20. The door water-stop device includes a door water-stop ring 21 and a ring of water-swellable agent 22. The door water-stop ring 21 is a stepped rubber water-stop ring with a boss on the outer side. The diameter of the bottom of the boss of the door water-stop ring 21 is larger than the outer diameter of the jacking pipe 100 and smaller than the inner diameter of the steel mounting ring 15. The cross-section of the water-swellable agent 22 is V-shaped and is pre-embedded on the outer side of the bottom of the boss of the door water-stop ring 21.

[0031] The gate opening and closing mechanism includes two hydraulic cylinders 31, two motors 32, two large telescopic rods 33, and two small telescopic rods 35. The two hydraulic cylinders 31 are installed on the inner side of the well wall 10 and symmetrically positioned above the cast-in-place opening ring 13 on both sides. The two motors 32 are correspondingly installed on the piston rod ends of the two hydraulic cylinders 31. The rear ends of the fixed sections of the two large telescopic rods 33 are correspondingly installed on the rotating shaft ends of the two motors 32. The front ends of the movable sections of the two large telescopic rods 33 are respectively... The large telescopic rod 33 is hinged to the middle of the inner side of the steel plate door 20 and symmetrically located on both sides of the center of the steel plate door 20; the large telescopic rod 33 is a hydraulic telescopic rod or an electric telescopic rod; the rear ends of the fixed sections of the two small telescopic rods 35 are installed on the rotating shafts of the two motors 32 in a corresponding manner, and the ends of the movable sections of the two small telescopic rods 35 are installed on the fixed sections of the two large telescopic rods 33 in a corresponding manner, so that the angle between the small telescopic rods 35 and the horizontal direction is not greater than 45°; the small telescopic rods 35 are also hydraulic telescopic rods or electric telescopic rods.

[0032] The gate opening and closing control system includes a water level monitor 41 and a gate controller. The water level monitor 41 is installed at the bottom of the inner cavity of the jacking pipe 100 located within the steel mounting ring 15. The gate controller is installed on the ground outside the jacking shaft and is connected via signal lines 42 to the water level monitor 41 and the two hydraulic cylinders 31, two motors 32, two large telescopic rods 33, and two small telescopic rods 35 of the gate opening and closing mechanism. The gate controller controls the piston rods of the two hydraulic cylinders 31 to extend and retract synchronously, controls the two motors 32 to rotate synchronously in opposite directions, controls the two large telescopic rods 33 to extend and retract synchronously, and controls the two small telescopic rods 35 to extend and retract synchronously. A manual control switch is also provided on the gate controller.

[0033] The pumping system includes a sump 50 located at the bottom edge of the jacking shaft and below one side of the cast-in-place opening ring 13, a pump 51 installed in the sump 50, and a pump controller (not shown) installed on the ground surface outside the jacking shaft. The bottom elevation of the sump 50 is lower than the elevation of the concrete base slab 11. The pump controller is connected to the pump 51 and the sump level gauge via signal lines 52. A sump level gauge (not shown) connected to the pump controller via a signal line can also be installed on the top of the sump 50. When the water level in the sump 50 exceeds the set value, the pump controller automatically starts the pump 51 to pump the water in the sump 50 to the outside of the jacking shaft.

[0034] The working principle of the automatic flood prevention device for the pipe jacking shaft of the present invention is as follows:

[0035] When there is no water in the pipe jacking working shaft, the floodgate 2 is positioned above the cast-in-place opening ring 13, with the upper part of the gate 2 resting against the gate limit rod 17. The piston rods of the two opening and closing hydraulic cylinders 31 retract, and the two large telescopic rods 33 rotate above the cast-in-place opening ring 13 via two motors 32. Both large telescopic rods 33 and two small telescopic rods 35 are in their longest extended state, and the angle between the two large telescopic rods 33 and the horizontal direction is α. The gate 2 will be pushed into the opening state (see Figure 1). During periods of low rainfall, rainwater flows into the pipe jacking working shaft and into the sump 50. It is necessary to manually start the pump 51 through the pump controller to pump water intermittently to reduce the amount of water in the sump 50. When frequent and heavy rainfall occurs, causing the water pump 51 to be unable to pump water in time, and the water level in the jacking working well reaches the inner bottom of the jacking pipe 100, and is detected by the water level monitor 41 at the tunnel entrance, the gate controller immediately activates the floodgate 2 to move downwards to block the jacking tunnel entrance (see Figure 4). Specifically, the gate controller first activates the piston rods of the two opening and closing hydraulic cylinders 31 to extend, pushing the gate 2 to a working surface that can move up and down, that is, pushing the gate 2 horizontally to the inside of the cast-in-place tunnel entrance ring 13. Then, the two motors 32 are activated to rotate synchronously in opposite directions, while simultaneously controlling the two large telescopic rods 33 to shorten synchronously, so that the angle between the two large telescopic rods 33 and the horizontal direction gradually decreases from α to 0 (see Figure 6). At this point, the two large telescopic rods 33 are in their shortest state. Then, control the two large telescopic rods 33 to extend synchronously, so that the angle between the two large telescopic rods 33 and the horizontal direction gradually increases from 0 to -α, that is, the rotation angle of the two motors 32 is 2α, so that the door 2 moves downward. When the two opening and closing hydraulic cylinders 31 push the door 2 out to the movable working surface, when the two large telescopic rods 33 and the two motors 32 are started, the rotation function relationship should be satisfied: l=L / cos(θ), where l is the extension length of the large telescopic rod 33, and the extension length l of the large telescopic rod 33 is L when it is the shortest; θ is the rotation angle of the large telescopic rod 33. The initial state is shown in Figure 1, and the final state is shown in Figure 4. Therefore, θ∈(-a,a).When the gate 2 moves downwards to align with the jacking opening, the gate controller controls the piston rods of the two opening and closing hydraulic cylinders 31 to retract synchronously, causing the gate 2 to move horizontally towards the jacking opening until it covers it. Simultaneously, the controller controls the two small telescopic rods 35 to retract synchronously to their shortest position, allowing the two large telescopic rods 33 to also press the gate 2 horizontally towards the jacking opening. The water pressure inside the jacking shaft also presses the gate 2 horizontally towards the jacking opening. Due to errors in the construction of the cast-in-place opening ring 13, the outer side of the flood-proof gate 2... There may be a gap between the inner end face of the gate and the inner end face of the cast-in-place opening ring 13. The gap between the gate and the inner end face of the cast-in-place opening ring 13 is sealed by two small telescopic rods 35 and the gate water-stop ring 21. The water-swellable agent 22 embedded on the outer side of the gate water-stop ring 21 will also expand when it comes into contact with water and make close contact with the bent part of the opening water-stop ring 16 that is pushed out by the jacking pipe 100. This further enhances the sealing and waterproofing effect of the gate 2 and prevents water in the jacking working well from entering the jacking pipe 100 and damaging the head of the jacking machine. When the water level monitor 41 detects that the water level has reached the inner bottom of the jacking pipe 100 and the automatic operation function of the gate controller fails, the gate controller will alarm. At this time, the floodproof gate will be closed by manually operating the manual control switch on the gate controller from the ground.

[0036] The automatic flood prevention device for the pipe jacking working shaft of the present invention monitors the water level in the pipe jacking working shaft through a water level monitor, thereby identifying the risk of flooding in the pipe jacking working shaft and quickly activating the flood prevention gate to automatically close the jacking opening, effectively preventing water in the pipe jacking working shaft from entering the jacking pipe and damaging the head of the pipe jacking machine.

[0037] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the scope of the invention and should be defined by the claims.

Claims

1. An automatic flood prevention device for a pipe jacking working shaft, installed inside the pipe jacking working shaft and including a flood prevention gate and a pumping system; the pipe jacking working shaft is constructed with a steel casing forming the shaft wall, and a jacking opening is formed on the lower part of the shaft wall on the side wall in the direction of pipe jacking; a cast-in-place opening ring with an inner diameter larger than the outer diameter of the jacking pipe is provided on the inner side of the shaft wall at the jacking opening opening position; a steel fitting ring with a limiting ring plate at the inner end is provided on the inner ring surface of the cast-in-place opening ring, allowing the jacking pipe to pass through the steel fitting ring; a water-stop ring with an inner diameter smaller than the outer diameter of the jacking pipe is installed on the inner side of the limiting ring plate of the steel fitting ring; characterized in that... The floodgate includes a door body, a door body opening and closing mechanism, and a door body opening and closing control system; The door body includes a steel plate door with a diameter larger than the inner diameter of the cast-in-place opening ring and a door body water-stopping device fixed on the outer side of the steel plate door. The door body water-stopping device includes a door body water-stopping ring and a ring of water-swellable agent pre-embedded on the outer side of the door body water-stopping ring. The ring of water-swellable agent is in contact with the opening water-stopping ring. The gate opening and closing mechanism includes two hydraulic cylinders, two motors, and two large telescopic rods. The two hydraulic cylinders are installed on the inner side of the well wall and are symmetrically located on both sides above the cast-in-place opening ring. The two motors are installed one-to-one on the piston rod ends of the two hydraulic cylinders. The rear ends of the fixed sections of the two large telescopic rods are installed one-to-one on the rotating shaft ends of the two motors. The front ends of the movable sections of the two large telescopic rods are each hinged to the middle of the inner side of the steel plate gate through a pile head and are symmetrically located on both sides of the center of the steel plate gate. The gate opening and closing control system includes a water level monitor and a gate controller. The water level monitor at the tunnel entrance is installed at the bottom of the inner cavity of the jacking pipe located within the steel fitting ring. The gate controller is installed on the ground surface outside the jacking shaft and is connected to the water level monitor at the tunnel entrance and the two hydraulic cylinders, two motors, and two telescopic rods of the gate opening and closing mechanism via signal lines. The gate controller controls the piston rods of the two hydraulic cylinders to extend and retract synchronously, controls the two motors to rotate synchronously in opposite directions, and controls the two large telescopic rods to extend and retract synchronously. A manual control switch is also provided on the gate controller. The pumping system includes a sump located at the bottom edge of the jacking shaft and below one side of the cast-in-place opening ring, a pump installed in the sump, and a pump controller installed on the ground surface outside the jacking shaft. The pump controller is connected to the pump via a signal line.

2. The automatic flood prevention device for the pipe jacking shaft according to claim 1, characterized in that, The door waterstop ring is a stepped rubber waterstop ring with a boss on the outer side. The diameter of the bottom of the boss of the door waterstop ring is larger than the outer diameter of the jacking pipe and smaller than the inner diameter of the steel mounting ring. The cross-section of the water-swellable agent is V-shaped and is embedded on the outer side of the bottom of the boss of the door waterstop ring.

3. The automatic flood prevention device for the pipe jacking shaft according to claim 1, characterized in that, The door opening and closing mechanism also includes two small telescopic rods. The rear ends of the fixed sections of the two small telescopic rods are installed on the rotating shafts of the two motors in a corresponding manner, and the ends of the movable sections of the two small telescopic rods are installed on the fixed sections of the two large telescopic rods in a corresponding manner, so that the angle between the small telescopic rods and the horizontal direction is no greater than 45°. Each of the two small telescopic rods is connected to the door controller through a signal line.

4. The automatic flood prevention device for the pipe jacking shaft according to claim 1, characterized in that, The bottom of the well wall is provided with a concrete base plate; the bottom of the cast-in-place opening ring is connected to the concrete base plate through a concrete reinforcement seat that is cast in sync with the cast-in-place opening ring; the bottom of the concrete base plate is also provided with a crushed stone cushion layer.

5. The automatic flood prevention device for the pipe jacking shaft according to claim 1, characterized in that, A gate limiting stake, with a length less than the thickness of the cast-in-place opening ring, is fixed on the well wall above the corresponding cast-in-place opening ring.

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