JP4587219B2 - Pressure excavation machine for renewal of existing concrete pipe and renewal method of existing concrete pipe using it. - Google Patents

Description

  The present invention relates to a pressure digging machine for renewing an existing concrete pipe for laying a new pipe while crushing an existing concrete pipe used for drainage or sewer of rainwater buried underground, and renewal of an existing concrete pipe using the same. Concerning construction method.

JP-A-7-98077 (conventional example 1) discloses a device for renewing an existing concrete pipe buried in the ground without using an open-cut method. An existing concrete pipe renewal excavator is disclosed in which an existing concrete pipe is crushed by an arranged excavator and then a new pipe is laid. Japanese Patent Laid-Open No. 10-220174 (conventional example 2) discloses a new new pipe in a space formed by excavating a ring around the old pipe while leaving the old pipe buried in the ground. A renewal method for underground pipes that lay down the ground is disclosed.
JP 7-98077 A JP-A-10-220174

  However, the full-section excavator of Conventional Example 1 can cut the rebar of mild steel (SS400), but cannot cut the reinforcing PC steel or the joint steel of the existing concrete pipe, wind around the cutter, and the work is interrupted to remove it. It will be. In addition, in the case of existing concrete pipes laid by excavation, sleepers and galley as the foundation are buried under the existing concrete pipes, and when these are crushed with the cutter of a full-section excavator, the foundation part is shaken. It becomes mud and the existing concrete pipe sinks, causing a problem that crushing with a cutter head becomes difficult. In addition, there is a problem that excavation by a full-section excavator becomes difficult due to the intrusion of groundwater from around the existing concrete pipe. Furthermore, excavation is not possible if existing pipes have branches or interruptions. In the existing pipe renewal method of Conventional Example 2, the existing pipe on the ground with a low N value has been sunk or floated for many years, making it difficult to lay a new pipe using the existing pipe as a guide Will occur.

  The present invention solves the problems of the conventional example, and can be installed under any construction conditions, and is a work machine for removing PC steel and joint steel that are difficult to crush with a cutter head in an existing concrete pipe Alternatively, it is an object of the present invention to provide a pressure excavation machine for renewing an existing concrete pipe that enables entry and exit of workers and prevents intrusion of groundwater, and an existing concrete pipe renewal method using the same.

In order to solve the above-described problem, the existing concrete pipe renewal pneumatic excavator of the present invention has an inner diameter larger than the outer diameter of the existing concrete pipe 2 embedded in the ground between the start shaft 22 and the arrival shaft 23. A ring-shaped cutter head 4 having an opening 5 and a bulkhead 10 are arranged at the front part of the main body 3 so that workers, materials, work machines, and crushed materials can be taken in and out , and reach the existing concrete pipe. place the airlock master 38 Shaft side, the shield machine main body inside and rear of the existing the shield machine main body to gas cylinder 14 placing the air lock doors 15 and 17 to the front and rear of the inside concrete pipes held in high pressure state placed side connecting rear portion of the gas cylinder, or a semi-shielding cylinder 19 placing the semi-shield jacks 20 between the shield machine main body and the gas cylinder together, the semi The over field jack and rear new tube 21 is connected by anchoring means 52, characterized in that pressing, and can detach the newly tube against the working face surface of the shield machine main body by expansion and contraction of the semi-shielding jacks and reaction force receiving And

Moreover, existing concrete pipe updating gas excavator of the present invention is characterized in that the drain pipe extending in the existing concrete pipe is disposed the shield machine main body, the gas cylinder, and through said semi-shielding cylinder .

Moreover, existing concrete pipe updating gas excavator of the present invention, the shield machine main body, the gas cylinder, and characterized by a waterproof the semi shield cylinder, respectively.

In addition, the pressure excavator for renewing an existing concrete pipe according to the present invention is a length capable of preventing intrusion of collapsed earth and sand of a natural ground into the excavator main body when the front end of the main body of the excavator is in a pressurized state from the position of the ring-shaped cutter head. This is characterized by protruding forward and having a slit cutter made of cemented carbide at the tip.

Moreover, the renewal method of the existing concrete pipe of the present invention uses the pressure concrete excavating machine for renewing the existing concrete pipe according to any one of claims 1 to 4 and arranges an air lock facility for shutting off the pressure in the existing concrete pipe, The inside of the machine and the existing concrete pipe are in a pressurized state to prevent ingress of groundwater to create a dry work space. The existing concrete pipe is crushed by the rotation of the ring-shaped cutter head and the central opening of the ring-shaped cutter Employees, materials, work machines, and crushed materials are taken into and out of the concrete space. Reinforcing concrete steel pipes, joint steel materials, etc. for existing concrete pipes that are difficult to break with a ring cutter head by the work machines and workers in the work space. It is characterized by cutting and removing work and laying new pipes in the space after crushing existing concrete pipes.
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A ring-shaped cutter head having an opening in the center and a bulk head are disposed at the front of an excavator main body having an inner diameter larger than the outer diameter of an existing concrete pipe buried in the ground of the present invention, and the excavator main body By connecting a pneumatic cylinder that keeps the inside and existing concrete in a pressurized state, it is difficult to crush with a ring-shaped cutter head into the existing concrete pipe. Reinforced PC steel, workers for removing joint steel, materials, work machines, and The crushed material can be taken in and out, and the working space can be made into a dry working space where the working space is in a pressurized state to prevent ingress of groundwater.
A semi-shield cylinder is integrally connected to the rear of the pressure cylinder, or between the main body and the pressure cylinder. Further, the semi-shield jack and several new pipes are connected by anchor means. When the existing concrete pipe is crushed by the ring-shaped cutter head of the excavator body and the reinforcing PC steel material is entangled with the ring cutter head of the excavator body, the excavator body is pulled away from the face and the worker The overall length of the existing concrete pipe renewal machine can be increased with respect to the outer diameter, so that the propulsion direction accuracy can be maintained even in soft ground conditions. Can do.
The drain pipe that extends into the existing concrete pipe is placed through the main body of the excavator, the pneumatic cylinder, and the semi-shield cylinder, so there is no need to place the drain pipe on the ground surface, obstructing the passage of people and vehicles on the ground surface do not do.
Air lock doors are arranged at the front and rear of the pressure cylinder to enable transport of workers, work machines, materials, and crushed materials while maintaining the pressure of compressed air supplied to the excavator body and existing concrete pipes. It becomes.
The construction of the excavator body, pressure cylinder, and semi-shield cylinder is waterproof, so that it is possible to maintain a dry work space even in the formation where there is a large amount of groundwater springs, and the work is suspended during heavy rain, and the front and rear parts of the pressure cylinder The air lock door is opened, and a large amount of rainwater that has flowed in can be drained using the main body of the excavator, the pressure cylinder, and the semi-shield cylinder as one drain pipe.
With a configuration in which the front end of the excavator main body protrudes forward by a length that can prevent the intrusion of collapsed sand and sand into the excavator main body under pressure from the cutter head arrangement position, and a slit cutter made of cemented carbide is provided at the tip, Can prevent the fallen sediment from entering the main body of the excavator from the natural ground, can smoothly promote the main body of the main excavator to the natural ground with a propulsion jack, and even if there is a branch pipe in the middle, it is made of cemented carbide Can be cut with a slit cutter.
Using the pressure excavator for renewing an existing concrete pipe according to any one of the first to sixth aspects of the invention, an air lock facility for shutting off the pressure is arranged in the existing concrete pipe, and the groundwater is set in the excavator main body and the existing concrete pipe in a pressurized state. To prevent the intrusion of the material into a dry work space, crushing the existing concrete pipe by rotating the cutter head, and entering / exiting workers, materials, work machines, and crushed materials from the central opening of the ring cutter into the existing concrete pipe The space after the existing concrete pipe is crushed by cutting / removing PC steel, joint steel, etc. of the existing concrete pipe that is difficult to crush with the ring cutter head by the work machine and workers in the work space In the same way as the above-mentioned pressure excavation machine for renewing existing concrete pipes, a new pipe is installed in the existing concrete pipe. Work machine and workers to remove reinforced PC steel and joint steel that are difficult to crush with a guillotine cutter head, enabling the work to be carried out by the work space and preventing the ingress of groundwater into the work space. Therefore, it is possible to cope with a change in construction conditions, and to provide a highly versatile and efficient renewal method for an existing concrete pipe.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall view showing a renewed state of an existing concrete pipe buried underground using the pressure excavation machine for renewing an existing concrete pipe of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. 3 is a cross-sectional view taken along line BB in FIG. 1, and FIG. 4 is a partially enlarged view of FIG.

  The existing concrete pipe renewal pressure excavator 1 includes an excavator body 3 having an inner diameter larger than the outer diameter of the existing concrete pipe 2 embedded in the ground. The outer diameter of the main body of the excavator is substantially the same as the outer diameter of the new pipe. The inner diameter of the new pipe is determined by examining the existing concrete pipe 2 and covering the maximum center error. At the front part of the excavator main body 3, a ring-shaped cutter head 4 is provided in which a cutter is provided only at a portion necessary for crushing the existing concrete pipe 2, and is arranged so as to be rotationally driven by a driving source. The ring-shaped cutter head 4 is provided with a face plate 6 having a large opening 5 in the center where a worker, material, work machine and crushed material can be taken in and out, and a roller bit 7 is rotated on the face plate 6 at predetermined intervals. Arrange freely. The roller bit 7 crushes the end portion of the existing concrete pipe 2 by the rotation of the ring-shaped cutter head 3.

  A mountain-clamping cylindrical portion 8 extends forward from the arrangement position of the ring-shaped cutter head 4 of the excavator main body 3 by a predetermined distance. The protruding length of the mountain stopper cylindrical portion 8 is set to a length that prevents the collapsed earth and sand of the natural mountain from entering the excavator main body 3 under a pressurized state. At the tip of the mountain stop cylindrical portion 8, a cemented carbide slit cutter 9 is provided to facilitate the propulsion of the excavator body to the ground with a propelling jack, and even if there is a branch pipe, it is made of cemented carbide. Can be cut with a slit cutter.

  A bulkhead 10 having an opening at the center is arranged at the rear of the ring-shaped cutter head 4 of the excavator main body 3. The bulkhead 10 is provided with driving means 11 having a speed reduction mechanism that rotationally drives the ring-shaped cutter head 3. Further, between the ring-shaped cutter head 4 and the bulk head 10, an existing concrete pipe 2 crushed by the ring-shaped cutter head 4 and a hopper 12 that receives excavated soil from some natural ground are installed. A crushed material conveying means 13 such as an endless belt is disposed below the hopper 12.

  A pressure cylinder 14 is fastened to a rear portion of the excavator main body 3 in a watertight manner through a sealing material. A front partition 16 formed with a front airlock door 15 that can be opened and closed is disposed at the front of the pressure cylinder 14, and a rear partition 18 formed with a rear airlock door 17 that can be opened and closed is disposed at the rear. The spaces defined by the air lock doors 15 and 17 at the front and rear portions of the pressure cylinder 14 are used as workers, work machines, materials, and material locks and manlocks for entering and leaving the start shaft 22. By alternately opening and closing the air lock doors 15 and 17 at the front and rear portions of the pressure cylinder 14 and conveying workers, work machines, materials, and crushed materials, the pressure state in the excavator main body 3 and the existing concrete pipe 2 is changed. Hold.

  As shown in FIG. 4, a semi-shield cylinder 19 is fastened to a rear portion of the pressure cylinder 14 in a watertight manner through a sealing material. A plurality of semi-shielded jacks 20 are arranged on the semi-shielded cylinder 19, the front end of the semi-shielded jack 20 and the rear part of the pressure cylinder 14 are connected and fixed by a clevis joint 50, and the rear end of the semi-shielded jack 20 is connected to a subsequent new pipe. It is fixed to the front end of 21 with a connecting bolt 51 or the like. Further, the semi-shield jack 20 and several subsequent new pipes 21 are connected by an anchor means 52 such as a tie rod. The semi-shield jack 20 uses the end of a new pipe 21 that is watertightly connected to the rear part of the semi-shield cylinder 19 as a reaction force to push the pneumatic cylinder 14 and the excavator main body 3 and push the plurality of semi-shield jacks 20. The extension amount is adjusted to control the propulsion direction of the excavator main body 3 and the pressing force to the end of the existing concrete pipe 2 of the ring-shaped cutter head 5. When the end face of the existing concrete pipe 2 is being crushed by the ring-shaped cutter head 4 of the excavator main body 3 and a reinforced PC steel material that cannot be cut and crushed by the ring-shaped cutter head 4 is entangled, it is anchored to the subsequent new pipe 21. The semi-shield jack 20 is used to pull the excavator body 3 away from the end face of the existing concrete pipe 2, and the worker performs the work of removing the reinforced PC steel material entangled with the ring-shaped cutter 4. The semi-shield cylinder 19 may be connected to the rear part of the excavator main body 3, and the compressed air cylinder 14 may be connected to the rear part of the semi-shield cylinder 19.

  The start shaft 22 and the reaching shaft 23 are excavated at a predetermined interval from the ground surface where the existing concrete pipe 2 is embedded. The distance between the starting shaft 22 and the reaching shaft 23 is determined by conditions such as the state of the ground surface and the pressing force for propulsion embedding of the new pipe 21.

  On the surface of the start shaft 22, a new pipe hoist 24 that suspends the new pipe 21 and a terro crane 27 that lifts and suspends the crushed material transporting bucket 25 are installed. A fall cradle 28 and a hopper 29 for loading the crushed material conveyed by the toro bucket 25 onto the dump truck bed are disposed below the Telha crane 27.

  In addition, a pressure blower unit 30 such as a compressor for supplying compressed air for bringing the inside of the excavator main body 3 and the existing concrete pipe 2 into a pressurized state is installed on the surface of the start shaft 22. Compressed air from the pressure blower unit 30 is sent into the excavator main body 3 and the existing concrete pipe 2 via the surface air feed pipe 31, the shaft bottom manifold 32, the flexible hose 33, and the underground air feed pipe 34, and inside the excavator main body 3 And the inside of the existing concrete 2 is brought into a pressurized state. The underground air pipe 34 is disposed through the front and rear partition walls 16 and 18 of the pressure cylinder 14 in a secret manner.

  In the start shaft 22, a support wall 35 serving as a reaction force of a pressing jack (not shown) for propelling the newly installed pipe 21 and the pressure excavator 1 for updating the existing concrete pipe is installed. When the existing concrete pipe 2 between the start vertical shaft 22 and the arrival vertical shaft 23 is updated to the new installation pipe 21, the existing concrete pipe 2 in the next section is updated to the new installation pipe 21 with the arrival vertical shaft 23 as a new start vertical shaft.

  A rail 36 on which the bucket 25 travels is laid on the bottom of the new pipe 21, the semi-shield cylinder 19, the pressure cylinder 14, and the machine main body 3. Further, a small-diameter drain pipe 37 is laid on the bottom of the new pipe 21, the semi-shield cylinder 19, the pressure cylinder 14, and the machine body 3, and the small-diameter drain pipe 37 hermetically seals the front and rear partition walls 16 and 18 of the pressure cylinder 14. It is arranged through. The small-diameter drain pipe 37 drains inflow groundwater accumulated in the existing concrete pipe 2 to the start shaft 22 side.

  An air lock master 38 is disposed in the existing concrete pipe 2. In the air lock master 38, a first air lock door 39 is formed on a partition wall provided with a seal ring that comes into airtight contact with the inner wall of the existing concrete pipe 2, and a second air lock door 40 is formed on the rear portion of the airtight housing. Is formed. The airtight housing defined by the first airlock door 39 and the second airlock door 40 may be used as a manlock 41 for an operator to enter and exit the existing concrete pipe 2 from the reach shaft 23 side. The air lock master 38 is provided with an exhaust relief valve 42 for ventilation in the work space and a pressure adjustment valve 43 for adjusting the pressure in the work space. The air lock master 38 may be fixed so as to be fixed at a predetermined position in the existing concrete pipe 2, or the existing concrete pipe 2 can be updated by a traction means (not shown) such as a winch installed in the reaching shaft 23. It is good also as a mobile type which moves to the reach shaft 23 side according to.

  In the existing concrete pipe 2 held in a pressurized state by the material lock of the pressure cylinder 14 and the manlock 41 of the air lock master 38, a movable work carriage 44 conveyed from the start shaft 22 side is disposed. The work carriage 44 is equipped with a crushing tool 45 such as a breaker. In the work space, the joint steel material 46 and the reinforced PC steel material of the existing concrete pipe 2 that are difficult to be crushed by the ring-shaped cutter head 4 are cut and removed by the work of the crushing tool 45 of the work carriage 44 and the worker.

  Since the water flows from the existing concrete 2 in the next renewal section, the submersible pump 47 is arranged in the reach shaft 23. When the drainage pumped up by the submersible pump 47 is transported to the start shaft 22 side by the drainage pipe arranged on the surface through the reaching shaft 23, it may interfere with the traffic on the surface roads and vehicles. . Therefore, the drainage pumped up from the submersible pump 47 is conveyed to the start shaft 22 side by the large-diameter drainage pipe 48 that airtightly penetrates the airlock master 38 and the front and rear partition walls 16 and 18 of the pressurized air cylinder 14, and has already been updated. Drain into a new pipe. In this case, since the existing concrete pipe 2 is crushed and propelled by the ring-shaped cutter head 4 of the excavator main body 3, the telescopic pipe 49 is interposed in a part of the large-diameter drain pipe 48, and one large-diameter drain pipe 48 is provided. When the length of the minute is dug, one large-diameter drain pipe 48 is removed, and the extension pipe 49 is extended and connected repeatedly.

  In the case where the existing concrete pipe 2 is a rainwater pipe or the like, if there is a large amount of rain, the water will increase, and the wastewater from the submersible pump 47 and the large-diameter drain pipe 48 cannot be treated. In such a case, the operation is suspended, the air lock doors 15 and 17 before and after the pressure cylinder, and the first and second air lock doors 39 and 40 of the air lock master 38 are opened, and rainwater is passed through the existing concrete pipe 2 and the excavation. It is transported to the start shaft 21 side as a continuous water distribution pipe comprising the machine main body 3, the pressure cylinder 14, the semi-shield cylinder 19, and the new pipe 21, and drained to the new pipe 21 that has already been updated. In order to use one drain pipe, the main body of the excavator, the pressure cylinder, and the semi-shield cylinder are each waterproof, and all equipment used in the mine is also waterproof.

  As described above, the existing concrete pipe can be updated even under various difficult construction conditions by the existing concrete pipe renewal pressure excavation machine and the existing concrete pipe renewal method using the same.

1 is an overall schematic diagram showing an embodiment of the present invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. FIG. 2 is a partially enlarged view of FIG. 1.

Explanation of symbols

1: Excavator for renewal of existing concrete pipe, 2: Existing concrete pipe, 3: Main body of excavator, 4: Ring-shaped cutter head, 5: Central opening, 6: Face plate, 7: Roller bit, 8: Stop Cylindrical part, 9: slit cutter, 10: bulk head, 11: driving means, 12: hopper, 13: crushed material conveying means, 14: pressure cylinder, 15: front airlock door, 16: front partition, 17: Rear airlock door, 18: Rear bulkhead, 19: Semi shield barrel, 20: Semi shield jack, 21: New pipe, 22: Start shaft, 23: Reaching shaft, 24: New pipe hoist, 25: Toro bucket, 26: Toro bucket For hoist, 27: Telha crane, 28: overturning cradle, 29: hopper, 30: pressurized air blower unit, 31: ground air pipe, 32: shaft bottom manifold, 33: flexible Sibble hose, 34: underground air pipe, 35: bearing wall, 36: rail, 37: small-diameter water pipe, 38: air lock master, 39: first air lock door, 40: second air lock door, 41: man Lock, 42: Exhaust relief valve, 43: Pressure control valve, 44, Working carriage, 45: Crushing tool, 46: Fitting steel, 47: Submersible pump, 48: Large diameter drain pipe, 49: Expansion pipe, 50: Clevis joint , 51: connecting bolt, 52: anchor means

Claims (5)

Workers, materials, and work machines are located in front of the excavator body (3) having an inner diameter larger than the outer diameter of the existing concrete pipe (2) buried in the ground between the start shaft (22) and the reaching shaft (23). And a ring-shaped cutter head (4) having a central opening (5) that enables entry and exit of crushed material, and a bulk head (10) are arranged, and an air lock master (38) is provided on the side of the existing shaft of the existing concrete pipe. was placed, said shield machine main body inside and the existing within concrete pipes arranged gas cylinder (14) placing the air lock doors (15, 17) to the front and rear holding the high pressure state to the shield machine main body rear side , the rear portion of the gas cylinder, or the integrally connected to the semi-shielding body arranged semi shield jacks (20) (19) between the shield machine main body and the gas cylinder, the semi-shield jacks and rear new tube 21) connected by anchoring means, pressing the new tube to the shield machine main body to the working face surface by expansion and contraction of the semi-shielding jacks and reaction force receiving, existing concrete pipe, characterized in that to enable detachment update Pressure pneumatic digging machine. The existing drain pipe the shield machine main body extending in the concrete pipe, the gas cylinder, and existing concrete pipe updating gas shield tunneling machine according to claim 1, characterized in that it is disposed through the semi-shielding cylinder. The shield machine main body, the gas cylinder, and existing concrete pipe updating gas shield tunneling machine according to claim 1 or 2, characterized in that the waterproof the semi shield cylinder, respectively. The front end of the excavator main body protrudes forward by a length that can prevent the intrusion of collapsed soil from the natural ground into the excavator main body under pressure from the ring cutter head placement position, and a cemented carbide slit cutter at the tip existing concrete pipe updating gas shield tunneling machine according to claim 1, characterized in that it comprises a. Using the pressure excavation machine for renewing an existing concrete pipe according to any one of claims 1 to 4, an air lock device for blocking the pressure air is arranged in the existing concrete pipe, and the ground water is set in the excavator main body and the existing concrete pipe in a pressurized state. Prevents intrusion to create a dry work space, crushes the existing concrete pipe by rotating the ring-shaped cutter head, and removes workers, materials, work machines and crushed materials from the central opening of the ring-shaped cutter into the existing concrete pipe. Performing cutting / removal work of reinforcing concrete steel pipes, joint steels, etc. that are difficult to crush with a ring-shaped cutter head by working machines and workers in the work space, after crushing the existing concrete pipe Renewal method for existing concrete pipes, characterized by laying new pipes in the space.

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