JP2018131873A - Balloon-type heat insulating device for manhole space - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating device for a manhole space for preventing heat from a lower part of the manhole space from being transmitted upward, which is excellent in heat insulation property, inexpensive, easily attached and detached, and safe.SOLUTION: A heat insulating device (1) for a manhole space arranged in a manhole (10) includes a disk-shaped balloon (2) having a predetermined thickness and composed of a combination of two inflated semi-disk-shaped balloons (2A, 2B). The balloon (2) presses an inner peripheral surface of the manhole (10) in an inflated state, to be fixed in the manhole (10). The heat insulating device (1) for a manhole space includes a flame resistant protecting bag (3) covering a surface of the balloon (2), and a plurality of drain pipes (5) disposed along at least an outer periphery of the balloon (2) in the inflated state with a predetermined interval. Water can pass from an upper part to a lower part of the balloon (2) through the drain pipes (5).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat insulating device for preventing the warm heat of a lower part of a manhole space from being transmitted to a manhole cover and the vicinity thereof.

  In areas where there is a lot of snowfall, road snow removal is performed. Although snow is completely removed on arterial roads, it is difficult to secure the place where snow is removed on relatively narrow roads and sidewalks such as residential areas. There are many cases. When a manhole is present at a place where such a snow removal method is performed, it often occurs that only the snow on the upper surface of the manhole cover melts to form a step having a depth of about 30 cm with respect to the surrounding surface. The cause of this step is that the temperature of the water flowing through the sewer at the lower part of the manhole space is as high as 15 to 20 ° C., and the tube heat rises in the manhole space and is transmitted to the manhole cover. When such a level | step difference arises, it is very dangerous for a pedestrian and a vehicle, and has become a big problem.

  For this reason, measures such as attaching a heat insulating material to the back side of the manhole cover are taken, but since the heat is transmitted to the wall and space near the back side of the manhole cover, the adjustment ring and mouth ring are heated. Therefore, a sufficient effect is not obtained.

  In order to solve the above problem, Patent Document 1 discloses a manhole cover top surface snow melting prevention device. The apparatus of Patent Document 1 performs heat insulation by suspending a ring-shaped tube in the middle part of the manhole space. The ring-shaped tube is suspended from the adjustment ring at the top of the manhole. A partition membrane that blocks the passage of air is stretched in the center through-hole of the ring-shaped tube. When rainwater accumulates on the upper surface of the center of the partition membrane or on the outer periphery of the tube, the weight is reduced. An open drain valve or drain pipe is provided. Moreover, when the heat insulation performance is not sufficient only by the partition film at the center of the ring-shaped tube, the heat insulation performance is enhanced by putting a plurality of heat insulation mats on the partition film.

JP 2001-140271 A

The manhole cover upper surface snow melting prevention device of Patent Document 1 has the following problems.
-Since the work of expanding the ring-shaped tube in the manhole is performed, the work is difficult and dangerous for the worker.
・ Because a plurality of fixing hooks are provided on the adjustment ring at the top of the manhole and each fixing hook and the ring-shaped tube must be connected by a plurality of chains or ropes. The adjustment ring cannot be used.
-The partition membrane in the center of the ring-shaped tube has lower heat insulation performance than the tube part, and it is necessary to prepare and insert a heat insulation mat separately to compensate for this. The work of collecting the insulation mat is also complicated.

  In view of the above situation, an object of the present invention is to provide a manhole space heat insulating device for preventing warm pipe heat from being transmitted upward from the lower side of the manhole space, and has high heat insulating performance, low cost, and easy and safe installation and removal work. Is to provide things.

In order to solve the above problems, the present invention provides the following configurations. Numbers in parentheses are reference numerals in the drawings described later, and are attached for reference.
The aspect of the present invention is a manhole space heat insulating device (1) installed in the manhole (10), and is a disc shape having a predetermined thickness in which two inflated semi-disc balloons (2A, 2B) are combined. The balloon (2) can be fixed in the manhole (10) by pressing the inner peripheral surface of the manhole (10) when the balloon (2) is inflated. It is characterized by that.
-In the said aspect, it is suitable to further have a flame-resistant protective bag (3) which covers the surface of the said balloon (2).
In the above aspect, the balloon (2) has a plurality of drain pipes (5) arranged at a predetermined interval along at least the outer periphery of the balloon (2) in an inflated state, and the balloon (2) passes through the drain pipe (5). It is preferable that water can pass from above to below.
In the above aspect, it is preferable that the thickness of the inflated balloon (2) is substantially the same as the interval between the ladders (16) of the manhole (10) or smaller than the interval between the ladders (16). It is.
-In the said aspect, it is suitable to have the fall prevention cord (4) connected with the ladder (16) of the said manhole (10) for fall prevention.
In the above aspect, the upright pipe portion (11) in which the inner peripheral surface of the manhole (10) is connected above the upright pipe portion (11) to which the sewer pipe (12) is attached in the manhole (10). It is suitable that it is an inner peripheral surface of the smaller diameter joint pipe part (12).

  The manhole space heat insulating device according to the present invention can be fixed in the manhole by pressing the inner peripheral surface of the manhole with a disk-shaped balloon that is a combination of two inflated semicircular balloons. Since it is divided into two parts, it can be formed into a disk shape by inserting the semi-disk-shaped balloon outside the manhole into a manhole in an inflated and folded state and opening it in the manhole. Since there is no need to perform expansion work in the manhole, the work is easy and safe.

  The balloon in this device can be made from an inexpensive material. In addition, the present apparatus can be applied to an existing manhole as it is, and a fixture other than a balloon is not required for attaching to the manhole. Therefore, this apparatus can be implemented at low cost.

  Since the balloon has a disk shape with a predetermined thickness, an air layer having a predetermined thickness can be interposed between the upper space and the lower space by the entire balloon, and the warm tube heat of the lower space is transferred to the upper space. High thermal insulation effect that blocks transmission.

FIG. 1 is a schematic longitudinal sectional view of a manhole to which an embodiment of a manhole space heat insulating device according to the present invention is applied. FIGS. 2A and 2B are an enlarged side view and plan view of the manhole space heat insulating device shown in FIG. FIG. 3 is a cross-sectional view taken along the line II of FIG. 4A and 4B are perspective views of the balloon of the manhole space heat insulating device shown in FIGS. FIG. 5 is a diagram for explaining an example of the installation work of the manhole space heat insulating device. FIG. 6 is a diagram for explaining an example of the attaching operation following FIG. FIGS. 7A to 7E are schematic cross-sectional views showing examples of installation for various types of manholes.

Embodiments of the present invention will be described below with reference to the drawings showing configuration examples of the present invention.
FIG. 1 is a schematic longitudinal sectional view of a manhole to which an embodiment of a manhole space heat insulating device according to the present invention is applied. FIGS. 2A and 2B are an enlarged side view and plan view of the manhole space heat insulating device shown in FIG. FIG. 3 is a cross-sectional view taken along the line II of FIG. FIG. 4 is a perspective developed view of the balloon of the manhole space heat insulating device shown in FIGS.

  The manhole space heat insulating device 1 of the present invention is a balloon system. The apparatus main body is a disk-shaped balloon having a predetermined thickness that is filled with air and inflated. The balloon can be inserted into the manhole 10 in the inflated state, and the balloon can be fixed in the manhole 10 by pressing the inner peripheral surface of the manhole 10.

  First, the manhole 10 to which the present apparatus 1 is attached will be described. Manholes have various sizes and shapes, and usually a plurality of concrete pipes are connected vertically to form a side wall, and a manhole cover is installed at the upper end opening. The manhole 10 shown in FIG. 1 is an example. The side wall of the manhole 10 is composed of an upright tube portion 11, a joint tube portion 12, and an upper restricting portion 13 from below to above. The lowermost cylindrical upright pipe portion 11 has a bottom portion and is the largest diameter portion to which the sewer pipe 17 is attached on the side surface, and stores water W. The cylindrical foot tube portion 12 has a smaller diameter than the upright tube portion 11. The upper restricting portion 13 has a substantially truncated cone shape that is restricted so that the diameter decreases from the lower side toward the upper side. Although the diameter and height of each part are various, as an example, the upright pipe part 11 has an inner diameter of 1500 mm and a height of 1220 mm, the extension pipe part 12 has an inner diameter of 900 mm, a height of 300 to 1500 mm, and the upper throttle part 13 is high. It is 300mm.

  An adjustment ring 14 is installed at the upper end of the upper throttle 13 and a manhole cover 15 is installed at the top. On the inner surface of the side wall of the manhole 10, a plurality of ladders 16 are attached in the vertical direction at a predetermined interval.

  In the case of the manhole 10 of FIG. 1, it is preferable that the manhole space heat insulating device 1 is attached to the joint pipe portion 12. The manhole space heat insulating device 1 functions as a partition that separates the inner space of the manhole 10 into a lower space and an upper space, and can block warm air rising from the lower portion of the manhole 10. In addition, the manhole space heat insulating device 1 has a large heat insulating effect because the balloon has an air layer with a predetermined thickness.

  It is preferable that the manhole space heat insulating device 1 be installed not at a position directly below the manhole cover 15 but at a predetermined distance from the manhole cover 15. In the example shown in the figure, the manhole space heat insulating device 1 is installed at a position that is approximately ½ the height of the joint pipe portion 12. Since the upper space of the manhole space heat insulating device 1 is maintained at a low temperature, the warm pipe heat in the lower space reaches the space just below the manhole cover 15 and the adjacent mouth ring and adjusting ring 14 through the manhole side wall. There is no. As a result, the manhole cover 15 and its surroundings can be maintained at the same temperature as the ground surface, and the problem of snow melting only on the manhole cover 15 is solved.

  In principle, the manhole space heat insulating device 1 can be installed in the upright pipe portion 11 of the manhole 10. However, in the case of a large manhole, the manhole space heat insulating device 1 is also large, and it is difficult to work at a deep position. Therefore, the manhole space heat insulating device 1 is installed not on the large diameter upright pipe portion 11 but on the small diameter extension pipe portion 12. It is preferable to do. However, if it is a small manhole and is composed only of a relatively small diameter upright pipe portion, it may be attached to the upright pipe portion.

  The configuration of the manhole space heat insulating device 1 will be described in detail with reference to FIGS. As shown in FIG. 2, the manhole space heat insulating device 1 fixed to the manhole 10 has a disk shape having a predetermined thickness H. The apparatus main body is a balloon 2 inflated into a disk shape having a predetermined thickness. The thickness H of the balloon 2 in the inflated state is substantially the same as the interval between the ladders 16 in the manhole, or is smaller than the interval between the ladders 16. When the thickness H is substantially the same as the interval between the ladders 16, it is supported by the upper and lower ladders 16 and has good stability. Further, when the thickness H is smaller than the interval between the ladders 16, the material of the balloon 2 can be reduced, so that the cost is low and the work is easy because the thickness is reduced.

  As shown in the perspective development view of FIG. 4, the balloon 2 is configured by combining two semicircular balloons 2 </ b> A and 2 </ b> B having the same shape obtained by vertically halving one disk. The semicircular balloons 2A and 2B each have an air supply port 21 with a check valve. The semi-disc shaped balloons 2A and 2B can be inflated by blowing air from the air supply port 21 using an air pump or a compressor. These semi-disc balloons 2A and 2B are combined with their flat surfaces facing each other.

  The material of the balloon 2 is made of a synthetic resin having elasticity, and can be formed into a hollow structure using, for example, a synthetic rubber sheet such as neoprene rubber or a multilayer sheet in which a synthetic rubber layer and a synthetic resin layer are laminated.

  The balloon 2 is preferably made of an inexpensive material. However, in that case, the flame resistance and durability may be lacking. In order to ensure the flame resistance and durability, the entire balloon 2 is wrapped with a protective bag 3. The protective bag 3 is made of a synthetic resin sheet having flame resistance and durability.

  As shown in FIG. 2 and FIG. 3, the protective bag 3 includes a circular bottom surface portion and two semi-disc shaped pocket portions for accommodating the semi-disc balloons 2A and 2B, respectively. 31 is provided. The fastener 31 extends along the surface where the semi-disc shaped balloons 2A, 2B abut each other. In the illustrated example, the fastener 31 is attached with two sliders so that it can be closed from both ends of the circle diameter toward the center. The number of the sliders of the fastener 31 may be one. The zipper-type fastener 31 is an example, and the upper surface may be closed with a tape-shaped hook-and-loop fastener. The synthetic resin sheet having the flame resistance and durability for producing the protective bag 3 may have these functions added by performing a surface treatment.

  Furthermore, one end of a string 4 that is a fall prevention cord is attached to the protective bag 3. The other end of the string 4 is connected to a ladder 16 as shown in FIG. When the manhole space heat insulation device 1 falls due to insufficient pressing force due to a decrease in the internal pressure of the balloon 2, the manhole space heat insulation device 1 falls to the water W storage portion because the string 4 is connected to the ladder 16. Can be prevented. In the illustrated example, a synthetic resin suspension ring 7 is attached to the protective bag 3 by adhesion or welding, and the string 4 is connected to the suspension ring 7. The string 4 may be, for example, a synthetic resin rope or a thin metal chain, and may have a hook or the like at an end thereof.

  Further, a plurality of drain pipes 5 are arranged at a predetermined interval along at least the outer periphery of the inflated balloon 2. Since the balloon 2 is wrapped in the protective bag 3, four drain pipes 5 are arranged on the outer circumference of the protective bag 3 at intervals of about 90 degrees. In the illustrated example, one drain pipe 5 is also arranged at the center of the balloon 2 (see FIGS. 3 and 4). Each drain pipe 5 penetrates in the up-down direction, the upper end opens to the upper space, and the lower end opens to the lower space. Rainwater and melted snow enter the manhole 10 from the surface. The drain pipe 5 is for allowing water that has fallen to the upper surface of the manhole space heat insulating device 1 (in this case, the upper surface of the protective bag 3) to pass downward and drain.

  The drain pipe 5 is preferably made of a hard synthetic resin having rigidity that is not crushed by the pressing force received from the balloon 2, and is a pipe made of, for example, vinyl chloride. The drain pipe 5 may be fixed in advance at a predetermined position of the protective bag 3 using an appropriate fixing means (not shown). A pocket for attaching the drain pipe 5 may be formed in the protective bag 3. Alternatively, when the manhole space heat insulating device 1 is fixed to the inner peripheral surface of the manhole 10, the drain pipe 5 may be inserted between the inner peripheral surface. Since the balloon 2 is flexible and easily deformable, the portion into which the drain pipe 5 is inserted is partially recessed (see FIG. 2B). The drain pipe 5 is sandwiched between the balloon 2 (protective bag 3) and the inner peripheral surface of the manhole 10, or between the semi-disc shaped balloons 2A and 2B.

  Next, with reference to FIG.5 and FIG.6, an example of the attachment operation | work which fixes the manhole space heat insulation apparatus 1 to the manhole 10 is demonstrated.

  As shown in the upper diagram of FIG. 5, first, the semicircular balloons 2 </ b> A and 2 </ b> B are inflated outside the manhole 10 (the ground surface). Air is supplied in order to obtain an internal pressure that provides a sufficient pressing force. In that case, it is preferable to monitor the internal pressure of the balloon in an air supply device such as an air pump. When the internal pressure at which sufficient pressing force can be obtained is reached, the supply of air is stopped. Since the air supply port 21 has a check valve, basically no air leaks. In the installation of the manhole space heat insulating device 1, the operation of inflating the balloon in the manhole 10 is not performed, so that the operation is easy and safe.

  Next, as shown in the center diagram of FIG. 5, the semi-disc shaped balloons 2A and 2B are inserted into the pocket portions of the protective bag 3 so that the whole is folded in half. The whole can be made compact by folding it in half. And the manhole space heat insulation apparatus 1 folded in half is inserted into the manhole 10 through the opening of the manhole 10 shown in the lower diagram of FIG.

  Subsequently, as shown in the upper diagram of FIG. 6, the manhole space heat insulating device 1 in a half-folded state is opened within the manhole extension pipe portion 12 to form a disk shape as a whole. At this time, one half disk-shaped balloon (reference numeral 2B in FIG. 6) is inserted between the pair of upper and lower ladders 16. FIG. 6 shows an example in which the balloon thickness is smaller than the interval between the ladders 16.

  As shown in the lower figure of FIG. 6, the manhole space heat insulating device 1 is completely opened to have a disk shape. The diameter of the inflated balloon is designed to be slightly larger than the diameter of the joint tube portion 12 in an unconstrained open state. Accordingly, the balloon is slightly compressed by opening it in the joint tube portion 12 to form a disk shape. The balloon in this state receives a reaction force from the inner peripheral surface at the same time as applying a pressing force evenly to the inner peripheral surface of the joint tube portion 12. As a result, the manhole space heat insulating device 1 is securely fixed.

  Thereafter, the fastener 31 on the upper surface of the protective bag 3 is closed. Further, the string 4 is connected to the upper ladder 16. Moreover, when the drain pipe 5 is not attached in advance, the drain pipe 5 is inserted into the surroundings.

  In the removal work, the reverse process is performed.

  Although not shown here, as another embodiment of the manhole space heat insulating device, the above-described protective bag 3 may not be used. When the protective bag 3 is not used, the above-described semi-disc balloons 2A and 2B are made from a material having flame resistance and durability. Further, the above-described suspension ring 7 and string 4 are attached to the upper surface of at least one of the semicircular balloons. Further, the two semi-disc balloons 2A and 2B are integrated by bonding the lower edges of the flat surfaces of the semi-disc balloons 2A and 2B facing each other by tape bonding or welding. In the attaching operation, the semi-disc shaped balloons 2A and 2B can be inflated and then folded into two with the joints as folds and inserted into the manhole. The subsequent steps are the same as those in FIG.

  FIGS. 7A to 7E are schematic cross-sectional views showing examples of installation of the manhole space heat insulating device of the present invention for various types of manholes.

  Manholes are known in a wide variety of shapes. The manhole space heat insulating device 1 of the present invention can be applied to manholes of almost any shape. For example, in the case of a relatively small manhole as shown in FIGS. 7A, 7 </ b> B, and 7 </ b> C, the upright pipe portion 11 is installed at an appropriate height. In the relatively large manhole shown in FIGS. 7 (d) and 7 (e), it is preferable to be installed in the small-diameter extension pipe portion 12 as shown in (d), but in the upper portion of the upright pipe portion 11 as shown in (d). May be installed. In any case, the manhole space heat insulating device 1 is set apart from the manhole cover 15 by a predetermined distance.

  The embodiment of the present invention described above is an example. In addition to these examples, various modifications by design changes are possible, and these are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Manhole space heat insulation apparatus 2 Balloon 2A, 2B Semi-disc balloon 21 Air supply port 3 Protection bag 31 Fastener 4 String (fall prevention cord)
5 Drain pipe 7 Suspension ring
DESCRIPTION OF SYMBOLS 10 Manhole 11 Upright pipe part 12 Joint pipe part 13 Upper throttle part 14 Adjustment ring 15 Manhole cover 16 Ladder 17 Sewer pipe

Claims (6)

  A manhole space heat insulating device (1) installed in a manhole (10) having a disk-shaped balloon (2) having a predetermined thickness in which two inflated semi-disk-shaped balloons (2A, 2B) are combined. The balloon (2) can be fixed in the manhole (10) by pressing the inner peripheral surface of the manhole (10) when the balloon (2) is inflated. Manhole space insulation device.   The balloon-type manhole space heat insulating device according to claim 1, further comprising a flame-resistant protective bag (3) covering a surface of the balloon (2).   A plurality of drain pipes (5) disposed at predetermined intervals along at least the outer periphery of the balloon (2) in an inflated state, and passing from the top to the bottom of the balloon (2) through the drain pipe (5); The balloon type manhole space heat insulating device according to claim 1 or 2, wherein water can pass therethrough.   The thickness of the balloon (2) in the inflated state is substantially the same as the interval of the ladder (16) of the manhole (10) or smaller than the interval of the ladder (16). 4. The balloon-type manhole space heat insulating device according to any one of 3 above.   The balloon-type manhole space heat insulation device according to any one of claims 1 to 4, further comprising a fall prevention rope (4) connected to a ladder (16) of the manhole (10) to prevent the fall.   The inner peripheral surface of the manhole (10) is connected to the upper side of the upright pipe portion (11) to which the sewer pipe (12) is attached in the manhole (10), and has a smaller diameter than the upright pipe portion (11). The balloon-type manhole space heat insulation device according to any one of claims 1 to 5, wherein the balloon-type manhole space heat insulation device is an inner peripheral surface of the pipe portion (12).

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