JP2013167078A - Temporary manhole cover with ventilator, and ventilation method for existing sewer - Google Patents

Abstract

To provide a temporary manhole cover with a ventilator capable of reliably ventilating existing pipes.
A temporary manhole cover with a ventilator includes a disc-shaped cover part, a ventilation part that can ventilate the outside of the manhole, and a blower that is arranged inside the manhole. The disc-shaped lid portion 2 has an upper surface 2 a disposed on the outer side of the manhole and a lower surface 2 b disposed on the inner side of the manhole, and is provided so as to close the opening 7 of the manhole 6. The ventilation part 3 is provided so as to penetrate the upper surface 2 a and the lower surface 2 b in the central part of the lid part 2. The blower 4 is fixed at a position below the ventilation portion 3 on the lower surface 2 b of the lid portion 2.
[Selection] Figure 2

Description

  The present invention relates to a temporary manhole cover with a ventilation device attached to an opening of a manhole, and a ventilation method for an existing pipe using the same.

  Conventionally, pipes (for example, sewer pipes and rainwater pipes) are buried in the ground such as roads. These existing pipes are subject to aging due to long-term use, and damage or water leakage may occur due to heavy vehicle traffic or vibration due to earthquakes. In this case, it will be necessary to repair and rehabilitate existing pipes that have been damaged or leaked.

  This pipe rehabilitation method includes excavation method of excavating the ground and removing the damaged existing pipe, then laying a new pipe, and repairing the inner peripheral surface of the existing pipe without excavating the ground. Non-cutting methods are known. In the open-cut method, in order to excavate the ground, it is necessary to block the traffic on the road, and the construction period becomes a problem. On the other hand, in the non-open-cut method, it is not necessary to dig up existing pipes, and the space required for construction can be reduced. Therefore, it is possible to quickly repair damaged parts of existing pipes while minimizing the impact on road traffic.

  When pipes are repaired by a non-open-cut method, two manholes (manholes) provided before and after the repaired part are used. In addition, in this pipe, gas such as combustible gas, carbon monoxide, hydrogen sulfide may be accumulated. If repair work is performed inside the tube in this state, the worker may be deficient in oxygen or gas poisoning. For this reason, it is necessary to ventilate the inside of the pipe by opening the manhole cover and sending air by a blower or a duct provided outside the manhole. However, if a manhole is provided in a place with a lot of traffic such as a road intersection, the manhole cannot be opened. In such a case, repair work is performed by opening the manhole on the upstream side or the downstream side away from the manhole at the intersection, and blowing air from the manhole.

  In general, the manhole cover prevents the odor generated from the sewage in the sewer pipe from leaking to the outside by sealing the opening of the manhole. On the other hand, the present inventors examined a method for ventilating a sewer pipe by newly producing a temporary manhole cover that ensures air permeability and placing the temporary manhole in a manhole such as an intersection. ing.

  Patent Document 1 discloses a manhole cover with an air supply / exhaust device. The air supply / exhaust device in Patent Document 1 is a device that operates in response to a sudden change in air pressure or water pressure in the pipe rod and prevents the manhole cover from scattering. Patent Document 2 proposes a manhole cover provided with a suction port and an exhaust port in order to have a deodorizing function.

Japanese Patent Laid-Open No. 2000-212984 JP-A-10-264991

  The manhole cover of Patent Document 1 is provided to prevent the manhole cover from scattering, and has no breathability during normal use when the air pressure and water pressure do not fluctuate. Therefore, even if a manhole cover as in Patent Document 1 is provided at the time of work, the existing pipe cannot be ventilated. In addition, in the manhole cover disclosed in Patent Document 2, the suction port and the exhaust port are provided to have a deodorizing function, and the air permeability cannot be sufficiently ensured.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a temporary manhole cover with a ventilator that can ensure sufficient ventilation and ventilate existing pipes reliably. It is in. Another object is to provide a method for ventilating an existing pipe using the temporary manhole cover with the ventilator, which can reliably ventilate the existing pipe.

  In order to solve the above-mentioned problem, the invention described in means 1 has a plate-like shape having an upper surface arranged outside the manhole and a lower surface arranged inside the manhole, and is provided so as to close the opening of the manhole. A lid, a vent that passes through the upper surface and the lower surface in the lid, and is ventable to the outside of the manhole, and a ventilator fixed at a position below the vent on the lower surface of the lid The gist of the temporary manhole cover with a ventilator is provided.

  According to the invention described in the means 1, the cover part of the temporary manhole cover is provided so as to close the opening part of the manhole, and the cover part is provided with the ventilation part penetrating the upper surface and the lower surface. Then, by driving a ventilation device fixed below the ventilation portion, it is possible to take outside air into the manhole through the ventilation portion or exhaust the air inside the manhole to the outside. By mounting such a temporary manhole cover with a ventilator on the opening of the manhole, a sufficient amount of air can be secured, so that ventilation in the existing pipe can be reliably performed. Moreover, if this temporary manhole cover is used, it is not necessary to provide a blower or a duct outside the manhole, so that existing pipes can be ventilated without blocking road traffic. Therefore, during the repair work of the existing pipes, the existing pipes can be continuously ventilated, and the safety of the operator can be ensured. Furthermore, since the opening of the manhole is closed by the lid, it is possible to prevent a pedestrian's fall accident or a vehicle derailment accident.

  The gist of the invention described in means 2 is that, in the means 1, the lid portion is disk-shaped, and the ventilation portion is a mesh-like ventilation portion provided in the center of the lid portion.

  According to the invention described in Means 2, since the lid portion is disk-shaped, it is possible to avoid the problem of dropping into the manhole. Moreover, since the mesh-shaped ventilation part is provided in the center of the lid part, the air permeability can be sufficiently ensured while ensuring the strength of the lid part.

  According to the invention described in means 3, in the means 2, the ventilation device is provided in the ventilation duct, a cylindrical ventilation duct provided so as to surround the outer periphery of the ventilation part below the ventilation part. The gist is that it is a blower having a blower fan.

  According to the invention described in the means 3, the ventilation in the manhole can be efficiently and reliably performed through the ventilation portion by driving the blower fan in the ventilation duct provided below the ventilation portion.

  According to the invention described in Means 4, in any one of Means 1 to 3, the lid portion may have a grating in which a steel material is assembled in a lattice shape and an outer edge portion side in a state where a central portion side is exposed on an outer surface of the grating. It consists of an outer frame plate provided so as to cover, and the gist exposed at the central portion functions as the ventilation portion.

  According to the invention described in the means 4, since the grating exposed at the central portion of the lid portion functions as the ventilation portion, it is possible to sufficiently ensure the air permeability while reducing the weight of the lid portion. Further, by providing the outer frame plate on the outer surface of the grating, the strength of the lid portion can be sufficiently ensured. Further, when taking outside air into the manhole through the ventilation portion, the outer frame plate provided around the ventilation portion functions as dust removal, and the entry of dust into the manhole can be suppressed.

  The invention described in means 5 is a temporary manhole cover with a ventilator according to any one of means 1 to 4, in place of a manhole cover for closing the opening in a manhole connected to an existing pipe buried in the ground. The gist of this method is to ventilate the existing pipe tub by mounting the pipe.

  According to the method described in the means 5, since a sufficient amount of air can be secured by using a temporary manhole cover with a ventilator, the existing pipe can be reliably ventilated. Moreover, since it is not necessary to provide a blower or a duct outside the manhole, the existing pipe can be ventilated without blocking road traffic. In this way, the worker can work with peace of mind within the existing pipe.

  The invention described in means 6 is the means 5 wherein the temporary manhole cover with the ventilator is attached to the upstream and downstream manholes in the existing pipe, respectively, and the ventilator in the upstream temporary manhole cover is driven. Then, while the outside air is blown into the existing pipe tub, the gist is to drive the ventilation device in the temporary manhole cover on the downstream side to exhaust the air in the existing pipe tub to the outside.

  According to the invention described in the means 6, outside air is taken into the manhole from the temporary manhole cover arranged on the upstream side in the existing pipe rod, and the air passing through the existing pipe rod is taken from the temporary manhole cover arranged on the downstream side. Exhausted outside the manhole. If it does in this way, since fresh air outside a manhole can be taken in in an existing pipe efficiently, an operator can work in an existing pipe in peace.

  As described in detail above, according to the inventions described in means 1 to 4, it is possible to provide a temporary manhole cover with a ventilator that can ensure sufficient ventilation and ventilate existing pipes reliably. it can. Further, according to the invention described in the means 5 or 6, it is possible to provide a method for ventilating an existing pipe rod that can reliably ventilate the existing pipe rod.

The top view which shows the temporary manhole cover of one Embodiment. Sectional drawing which shows the temporary manhole cover of one Embodiment. The top view which shows the installation place of a temporary manhole cover. Sectional drawing which shows the ventilation method of the sewer pipe using a temporary manhole cover. Sectional drawing which shows the temporary manhole cover of another embodiment.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the temporary manhole cover 1 according to the present embodiment includes a disc-shaped lid portion 2 having an upper surface 2 a and a lower surface 2 b, and a ventilation portion provided at the center of the lid portion 2. 3 and a blower 4 (ventilator) fixed at a position below the ventilation portion 3.

  The lid portion 2 of the temporary manhole lid 1 is provided so as to close the opening 7 of the manhole 6 with its upper surface 2 a being disposed outside the manhole 6. The lid portion 2 has a strength of T-25 or more with an automobile load, and has a structure that can sufficiently withstand the passage of a vehicle or the like. Specifically, the lid portion 2 in the present embodiment has a grating 11 in which iron steel materials are assembled in a lattice shape, and an outer edge portion side in a state where the central portion side is exposed on the outer surface (upper surface 2a) of the grating 11. It consists of the outer frame board 12 provided so that it might cover. The lid 2 has a diameter of 620 mm and a thickness of 45 mm. The grating 11 and the outer frame plate 12 are painted with a red paint.

  The grating 11 is provided with a mesh-like through hole 11a penetrating the upper surface 2a and the lower surface 2b of the lid portion 2. A circular hole 12 a is formed at the center of the outer frame plate 12, and each through hole 11 a of the grating 11 exposed through the circular hole 12 a functions as the ventilation portion 3. On the upper surface 2a of the lid part 2, a pair of handles 13 are provided at positions facing each other with the ventilation part 3 interposed therebetween. The handle 13 is normally housed inside so as to be at the same height as the upper surface 2a, and is used by being pulled upward so as to be easily grasped when the temporary manhole cover 1 is lifted.

  Further, the lid portion 2 is provided with an insertion hole 16 for inserting the power cable 15. Further, a cushion material 17 such as rubber is provided on the inner surface of the insertion hole 16 so as to prevent damage due to wear of the power cable 15 or the like. The power cable 15 is connected to the blower 4, and the blower 4 is driven by the power supplied via the power cable 15.

  The blower 4 includes a cylindrical ventilation duct 21 and a blower fan 22. The ventilation duct 21 has a size of 340 mm in diameter and length, and is provided below the ventilation part 3 so as to surround the outer periphery of the ventilation part 3. The blower fan 22 is provided in the ventilation duct 21.

  The blower 4 of the present embodiment is provided so as to be detachable with respect to the lid 2. More specifically, fixing members 23 are provided at both ends of the ventilation duct 21 and are attached to the lid 2 via the fixing members 23 provided at either one of the ends. Further, even when the direction of the blower 4 is reversed in the vertical direction, the blower 4 can be attached to the lid portion 2 via the fixing member 23 on the other end side. As described above, the blower 4 of the present embodiment is provided so that the blowing direction can be switched between the direction toward the inner side of the manhole and the direction toward the outer side of the manhole.

  The temporary manhole cover 1 of the present embodiment is a manhole cover that closes the opening 7 of the manhole 6 connected to the sewer pipe when repairing an existing pipe dredger (for example, a sewer pipe) buried in the ground. It is installed instead of. Specifically, for example, when the manhole 6 is provided at the intersection 32 of the road 31 with a high traffic volume, the temporary manhole cover 1 is attached to the opening 7 (see FIG. 3). In this case, the generator 33 is installed in an empty space near the intersection 32. Then, the power cable 15 of the blower 4 extending from the temporary manhole cover 1 is connected to the generator 33. The power cable 15 is disposed along the road 31 at the intersection 32, and a protective mat 34 is laid so as to cover the power cable 15.

  Next, the specific example of the ventilation method of the sewer pipe using the temporary manhole cover 1 of this Embodiment is demonstrated.

  As shown in FIG. 4, first, the lid of the manhole 6 provided on the upstream side and the downstream side of the repaired portion of the sewer pipe 40 is opened. And the temporary manhole cover 1 for ventilation to which the air blower 4 is fixed is attached to the opening 7 of the upstream manhole 6 so that the air blowing direction is directed toward the inside of the manhole. On the other hand, a temporary manhole cover 1 for exhaust, to which the blower 4 is fixed, is attached to the opening 7 of the manhole 6 on the downstream side so that the air blowing direction is directed toward the outside of the manhole. Thereafter, the power cable 15 connected to the blower 4 in each temporary manhole cover 1 is connected to the generator 33. Further, a protective mat 34 is laid on the power cable 15 disposed on the road 31.

  As described above, after the temporary manhole cover 1 is mounted on the manhole 6, the blower 4 is driven by operating the generator 33 and supplying power. At this time, in the sewer pipe 40, outside air is taken into the manhole from the temporary manhole cover 1 arranged on the upstream side. And the air which passed the inside of the sewer pipe 40 is exhausted out of the manhole from the temporary manhole cover 1 arrange | positioned in the downstream, and the ventilation in the sewer pipe 40 is performed.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the temporary manhole cover 1 of the present embodiment, the cover part 2 is provided with a ventilation part 3 penetrating the upper surface 2 a and the lower surface 2 b, and the blower 4 is provided below the ventilation part 3. By mounting the temporary manhole cover 1 on the opening 7 of the manhole 6 and driving the blower 4, outside air is taken into the manhole 6 through the ventilation portion 3, or the air in the manhole 6 is exhausted to the outside. can do. As a result, the sewage pipe 40 can be reliably ventilated. Moreover, since it is not necessary to provide the air blower 4 and a duct outside the manhole 6, the sewage pipe 40 can be ventilated without blocking road traffic. Therefore, the sewage pipe 40 can be continuously ventilated, and the operator can perform the repair work of the sewage pipe 40 with peace of mind. Furthermore, since the opening 7 of the manhole 6 is closed by the lid 2, it is possible to prevent a pedestrian's fall accident or a vehicle derailment accident.

  (2) The temporary manhole cover 1 of the present embodiment can avoid the problem of dropping into the manhole 6 because the cover 2 is disk-shaped. Further, in the temporary manhole cover 1, the grating 11 exposed at the center part of the cover part 2 functions as the ventilation part 3. Since the grating 11 is provided with a plurality of mesh-like through holes 11a, the air permeability can be sufficiently secured while reducing the weight of the lid portion 2. In addition, by providing the outer frame plate 12 on the outer surface of the grating 11, the strength of the lid portion 2 can be sufficiently ensured. Furthermore, when taking outside air into the manhole 6 through the ventilation part 3, the outer frame plate 12 provided around the ventilation part 3 functions as dust removal, and it is possible to suppress entry of dust into the manhole 6. it can.

  (3) In the present embodiment, the temporary manhole cover 1 with a ventilator is attached to the upstream and downstream manholes 6 in the sewer pipe 40. Then, outside air is taken into the manhole 6 from the temporary manhole cover 1 disposed on the upstream side of the sewage pipe rod 40, and the air passing through the inside of the sewage pipe rod 40 is transferred from the temporary manhole cover 1 disposed on the downstream side to the manhole. Exhausted outside. If it does in this way, since fresh air outside the manhole 6 can be taken in into the sewer pipe 40 efficiently and reliably, the operator can perform repair work of the sewer pipe 40 with peace of mind.

  (4) In the temporary manhole cover 1 of the present embodiment, the grating 11 and the outer frame plate 12 constituting the cover part 2 are painted with a red paint. In this case, the temporary manhole cover 1 can be easily distinguished from the appearance (color of the cover part 2). As a result, after the completion of the repair work or the like, it is possible to quickly perform the operation of collecting the temporary manhole cover 1 and replacing it with a regular manhole cover.

  (5) In the temporary manhole cover 1 according to the present embodiment, the pair of handles 13 are provided on the upper surface 2 a of the cover portion 2 at positions facing each other with the ventilation portion 3 interposed therebetween. The manhole cover 1 can be easily carried.

  In addition, you may change embodiment of this invention as follows.

  In the above embodiment, the temporary manhole cover 1 for blowing is installed on the upstream side of the sewer pipe 40 and the temporary manhole cover 1 for exhausting is installed on the downstream side. However, the present invention is limited to this. It is not a thing. For example, the temporary manhole cover 1 for blowing may be installed only in the upstream manhole 6 of the sewer pipe 40 and the downstream manhole 6 may be opened without installing the temporary manhole cover 1. In this case, the worker enters and exits, loads the work implement, and the like from the open manhole 6 and discharges air from the sewage pipe 40. Even in this way, the sewage pipe 40 can be ventilated.

  As shown in FIG. 5, a water level detection sensor 42 for detecting the water level in the manhole 6 and a concentration detection sensor 43 for detecting the gas concentration are provided on the lower surface 2b side of the lid 2 in the temporary manhole covers 1A and 1B. Also good. In the specific example shown in FIG. 5, the water level of the sewage W1 flowing in the manhole 6 (sewage pipe 40) is detected by the water level detection sensor 42 provided in the temporary manhole cover 1A on the upstream side. Further, the gas concentration in the manhole 6 is detected by the concentration detection sensor 43 provided in the temporary manhole cover 1B on the downstream side. In this way, it is possible for the upstream water level detection sensor 42 to detect that rain has fallen and the water level of the sewage W1 has risen. Then, by notifying that the water level has become abnormal with a warning sound or the like, the worker can suspend the operation and quickly escape from the inside of the sewer pipe 40 to the outside. Further, when the downstream gas concentration detection sensor 43 detects that the gas concentration has become high, the ventilation capacity of the blower 4 can be increased and the sewage pipe 40 can be reliably ventilated.

  In the above embodiment, the power cable 15 is arranged on the road outside the manhole 6, but the power cable 15 may be arranged in the sewer pipe 40 to supply power. In addition, a battery may be disposed on the outer surface of the blower 4 (ventilation duct 21) or the like in the temporary manhole cover 1, and the blower fan 22 may be driven by supplying power from the battery.

  -In above-mentioned embodiment, although the air blower 4 was provided with respect to the cover part 2 of the temporary manhole cover 1 so that attachment or detachment was possible, you may fix the air blower 4 so that attachment or detachment is impossible by welding. In this case, the blowing direction of the blower 4 in the temporary manhole cover 1 is a constant direction. Therefore, a temporary manhole cover 1 for blowing air outside the manhole and a temporary manhole cover 1 for exhausting air outside the manhole are separately prepared.

  In the above-described embodiment, the blower 4 that blows air in a certain direction is used, but a blower that can rotate the blower fan 22 in forward and reverse directions and has a function of switching the blower direction may be used. Specifically, for example, a change-over switch that switches the ventilation direction of the blower 4 between the direction toward the inner side of the manhole and the direction toward the outer side of the manhole is provided, and the blowing direction is switched by the switch. Furthermore, the air blowing direction may be changed by switching the switch by communication means such as wireless communication.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiments described above are listed below.

  (1) In any one of the means 1 to 4, a sensor for detecting a water level in the manhole or a sensor for detecting a gas concentration is provided on the lower surface side of the lid portion. Temporary manhole cover.

  (2) In any one of the means 1 to 4, the lid part is provided with an insertion part such as an insertion hole or an insertion notch for inserting a power cable for driving the ventilation device. Temporary manhole cover with ventilation device.

  (3) The temporary manhole cover with a ventilator according to any one of the means 1 to 4, wherein the cover part is an iron cover part and is painted with a colored paint.

  (4) The temporary manhole cover with a ventilator according to any one of the means 1 to 4, wherein a pair of handles are provided on the upper surface of the cover portion so as to face each other with the ventilation portion interposed therebetween.

  (5) In any one of the means 1 to 4, the ventilator is provided so as to be switchable between a direction toward the inner side of the manhole and a direction toward the outer side of the manhole. Manhole cover.

  (6) A temporary manhole cover with a ventilator according to any one of means 1 to 4, further comprising a battery mounted on an outer wall surface of the ventilator and driving the ventilator.

DESCRIPTION OF SYMBOLS 1,1A, 1B ... Temporary manhole cover with ventilation device 2 ... Cover part 2a ... Upper surface of cover part 2b ... Bottom surface of cover part 3 ... Ventilation part 4 ... Blower as ventilator 6 ... Manhole 7 ... Opening part 11 ... Grating 12 ... Outer frame plate 21 ... Ventilation duct 22 ... Blower fan 40 ... Sewage pipe as an existing pipe

Claims (6)

A plate-like lid portion that has an upper surface arranged outside the manhole and a lower surface arranged inside the manhole, and is provided so as to close the opening of the manhole;
A ventilation part penetrating the upper surface and the lower surface in the lid, and ventable to the outside of the manhole;
A temporary manhole cover with a ventilator, comprising: a ventilator fixed at a position below the vent on the lower surface side of the lid.   2. The temporary manhole cover with a ventilator according to claim 1, wherein the lid portion is disk-shaped, and the ventilation portion is a mesh-like ventilation portion provided in the center of the lid portion.   The ventilator is a blower having a cylindrical ventilation duct provided so as to surround an outer periphery of the ventilation part below the ventilation part, and a blower fan provided in the ventilation duct. A temporary manhole cover with a ventilation device according to claim 2.   The lid portion is composed of a grating in which steel materials are assembled in a lattice shape, and an outer frame plate provided so as to cover the outer edge portion side in a state where the central portion side is exposed on the outer surface of the grating. The temporary manhole cover with a ventilator according to any one of claims 1 to 3, wherein the exposed grating functions as the ventilation portion.   In a manhole connected to an existing pipe buried in the ground, the temporary manhole cover with a ventilator according to any one of claims 1 to 4 is attached in place of the manhole cover for closing the opening. A method for ventilating existing pipes, wherein the existing pipes are ventilated.   Temporary manhole covers with the ventilation device are attached to the upstream and downstream manholes in the existing pipe rod, respectively, and the ventilation device in the temporary manhole cover on the upstream side is driven to blow outside air into the existing pipe rod. 6. The method for ventilating an existing pipe according to claim 5, wherein a ventilation device in the temporary manhole cover on the downstream side is driven to exhaust the air in the existing pipe to the outside.

Images