JP2012197588A - Cavity part filling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cavity part filling method that requires no large-scale construction to fill a cavity part and thereby shortens the construction period, prevents the filling from being insufficient, and achieves the construction on a soft ground.SOLUTION: A raw material injection pipe 110A having raw material discharge holes 112A formed at a plurality of places and an air exhaustion and confirmation pipe 130A which has a plurality of air exhaustion holes formed in a side face of a transparent pipe at a plurality of places and has the air exhaustion holes covered with a raw material-impermeable and air-permeable member 135A are inserted into a cavity part 101A. After a foaming raw material is supplied into the raw material injection pipe 110A and injected into the cavity part 110A to be made to foam, a foaming filling state in the cavity part 101A is confirmed through a scope inserted into the air exhaustion and confirmation pipe 130A. If there is a filling-insufficient place, a foaming raw material is supplied into the air exhaustion and confirmation pipe 130A, and the raw material-impermeable and air-permeable member 135A is shifted from the air exhaustion holes to inject the foaming raw material into the filling-insufficient place from the air exhaustion holes.

Description

  The present invention relates to a cavity filling method for filling a foam by injecting a foam raw material into a cavity existing in the ground or the like.

Conventionally, as a method of backfilling unnecessary buried pipes buried in the ground, an opening is formed by excavating the entire surface or a part of the pipe, and soil or concrete is filled into the pipe from the opening. Then, there is a method of performing backfilling, and then performing concrete floor slab placement work or paving work (Patent Document 1).
In addition, the removal section of underground piping is separated from the remaining section of the piping and pulled out, and backfill material is injected and filled between the removed section and the remaining section, and then concrete floor slab placement work and paving work are performed. There is a method (Patent Document 2).

  However, in the method of excavating the opening and filling the cavity with soil or concrete, it is necessary to excavate the ground and make a hole in the pipe. Therefore, the construction period is long and large-scale construction is required. Moreover, since large heavy machinery is used for construction, traffic regulation is required at the construction site. Further, in order to densely fill the soil and concrete up to the upper part of the pipe, it is necessary to excavate the ground over the entire pipe. Furthermore, when the ground under the pipe is soft, filling the material with a high density such as soil or concrete may cause the ground to collapse.

  On the other hand, in the method of separating and removing the underground pipe removal section from the remaining piping section, installation of vertical piles, separation of the piping removal section from the remaining piping section, injection filling and filling It is necessary to place concrete floor slabs and pavement after filling the backing material, so it takes time for the work, the construction period is long, and large heavy equipment is used for construction, so traffic restrictions are required at the construction site. Become. Furthermore, there is a problem that it is not possible to confirm whether there is insufficient filling of the backing material after the filling of the backing material.

Further, there is a method in which an unnecessary embedded pipe is filled with an aqueous solution in which a water-soluble urethane compound having an isocyanate group at the terminal is dissolved in a large amount of water to form a highly hydrous polyurethane foam in the unnecessary embedded pipe (Patent Document 3). ).
In addition, there is a method of injecting a foamed urethane raw material liquid into a horizontal hole cavity such as an abandoned mine or an air defense fence (Patent Document 4).

However, in the conventional method of filling the foam, the air in the unnecessary buried pipe or the side hole cavity loses the escape place during foaming and is trapped in the unnecessary buried pipe or the side hole cavity, and the foam material is stored. Insufficient filling of the unnecessary buried pipe or the side hole cavity may result in an insufficiently filled portion where the foam is not filled in a part of the unnecessary buried pipe or the side hole cavity.
Further, in the conventional method of filling the foam, a method for confirming the foamed state is obstructed by the already filled foam even if there is an insufficiently filled portion of the foam in the unnecessary buried pipe or the side hole cavity. I had to leave it as it was. As a result, there is a problem in that the strength of the unnecessary buried pipe and the side hole cavity is reduced at the insufficiently filled portion of the foam.

JP-A-8-73848 JP-A-8-28753 JP 2000-145400 A JP 2006-2562 A

  The present invention has been made in view of the above points, and when filling a hollow portion such as underground, it is not a large-scale construction, the work period can be shortened, and insufficient filling can be prevented. However, it aims at providing the cavity filling method which can be constructed.

  According to a first aspect of the present invention, there is provided a cavity filling method in which a foam raw material is injected into a cavity and foamed to fill the foam, and material discharge holes are formed at a plurality of locations in a length direction of the pipe on a side surface of the pipe. The exhaust is made by the raw material injection pipe and a raw material impervious air-permeable member which has exhaust holes formed at a plurality of positions in the length direction of the transparent pipe on the side surface of the transparent pipe and does not pass the foam raw material and has air permeability. A pipe insertion step for inserting the exhaust and confirmation pipe, in which the hole is covered from the outside of the side surface of the transparent pipe, into the cavity, and supplying the foam raw material into the raw material injection pipe from outside the cavity The foam material is injected from the material discharge hole into the cavity and foamed to fill the cavity with the foam. At the time of foaming, the air in the cavity is impermeable to the exhaust and confirmation pipe. Breathable part The foaming exhaust process for discharging from the exhaust hole covered with the exhaust through the exhaust and confirmation pipe to the outside of the cavity, and the scope inserted into the exhaust and confirmation pipe, the filling state of the foam in the cavity And a filling confirmation step for confirming from outside the cavity.

  According to a second aspect of the present invention, in the first aspect, when it is discovered in the filling confirmation step that there is an insufficiently filled portion in the cavity, the foam raw material is placed in the exhaust and confirmation pipe. The raw material impervious air-permeable member, which is supplied from outside and covers the exhaust hole located at the insufficiently filled portion among the plurality of exhaust holes formed in the exhaust / confirmation pipe, The foam raw material supplied into the confirmation pipe is pushed out of the exhaust / confirmation pipe by the foam raw material, or is removed from the exhaust / confirmation pipe to open the exhaust hole. A replenishing step of injecting foam material into the insufficiently filled portion and foaming is performed after the filling confirmation step.

  According to a third aspect of the present invention, in the second aspect of the present invention, when an insufficiently filled portion is not found in the hollow portion in the filling confirmation step, the amount of foaming that can be filled with foam in the exhaust and confirmation pipe The body material is supplied into the exhaust / confirmation pipe from outside the cavity, and the foam filling process in the pipe for foaming the foam material in the exhaust / confirmation pipe is performed after the filling confirmation step. And

  According to a fourth aspect of the present invention, in any one of the first to third aspects, in the pipe insertion step, a plurality of the exhaust / confirmation pipes are inserted into the cavity and arranged at a plurality of positions in the cavity. It is characterized by that.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, in the pipe insertion step, a plurality of the raw material injection pipes and the exhaust / confirmation pipes are respectively inserted into the hollow portions, Arranged in a plurality of stages having different heights, the foaming and exhausting step is performed from the lowest raw material injection pipe to the highest raw material injection pipe in the plurality of raw material injection pipes one by one or sequentially in a plurality of stages, The filling confirmation process is performed every time the foaming exhaust process is completed for each stage or for each of a plurality of stages.

  According to the first aspect of the present invention, when the foam is filled in the cavity, it is only necessary to form a hole into which the raw material injection pipe and the exhaust / confirmation pipe can be inserted in the ground and the cavity. There is no need to make a large hole, so the construction is not large and the construction period can be shortened. Moreover, since the foam filling the cavity has a lower density than soil and concrete, it can be applied even on soft ground. Furthermore, it can be confirmed by the scope that the foam is reliably filled. In addition, when there is an insufficiently filled portion, the insufficient filling can be prevented by re-positioning the raw material injection pipe so as to pass through the underfilled portion from the outside of the cavity and refilling the foam.

  According to the invention of claim 2, when the filling state of the foam is confirmed and an insufficiently filled portion is found, the foam raw material is supplied from the outside of the cavity into the exhaust and confirmation pipe, and the insufficiently filled portion is provided. Since the foam can be filled, insufficient filling can be prevented. Also, the foam material adhering to the inner wall of the raw material injection pipe and the foam raw material adhering to the inner surface of the pipe of the exhaust and confirmation pipe are foamed, and the foam is formed in the raw material injection pipe and the exhaust and confirmation pipe. Since it is filled, the inside of the raw material injection pipe and the inside of the exhaust / confirmation pipe do not remain as insufficiently filled portions in the hollow portion. In the invention of claim 2, the exhaust / confirmation pipe also serves as a raw material replenishment pipe, and may be referred to as an exhaust / confirmation replenishment pipe.

  According to the third aspect of the present invention, since the foam material is injected into the exhaust / confirmation pipe and the foam is filled into the exhaust / confirmation pipe even when an insufficient filling location is not found, The inside of the confirmation pipe does not remain as an insufficiently filled portion in the cavity.

  According to the invention of claim 4, since it is possible to fill the foam when the filling state is confirmed at a plurality of positions in the cavity and an insufficient filling portion is found, the filling is insufficient even when the inside of the cavity is wide. Can be prevented.

  According to the fifth aspect of the present invention, the filling of the foam and the confirmation of the filling state are repeated in order from the low position to the high position in the cavity portion, so that even when the ceiling in the cavity portion is high, insufficient filling is prevented more effectively. be able to.

It is a schematic sectional drawing of the state which inserted the raw material injection pipe and the exhaust and confirmation pipe in the hollow part in 1st Embodiment. It is AA sectional drawing of FIG. It is sectional drawing which shows the example of the raw material injection | pouring pipe and the pipe for exhaust and confirmation. It is sectional drawing which shows fixation of the pipe which uses a fastener. It is a perspective view which shows the example of arrangement | positioning of the pipe which uses a tower. It is a schematic front view which shows the kind of tower. It is a schematic sectional drawing which shows the time of injection | pouring of the foam raw material in 1st Embodiment, and foaming. It is a schematic sectional drawing which shows the time of confirmation of the filling state in 1st Embodiment. It is a schematic sectional drawing which shows the time of replenishment in 1st Embodiment. It is a schematic sectional drawing of the state which inserted the raw material injection pipe and the exhaust and confirmation pipe in the hollow part in 2nd Embodiment. It is BB sectional drawing of FIG. It is sectional drawing which shows the example of the raw material injection | pouring pipe and the pipe for exhaust and confirmation. It is a schematic sectional drawing which shows the time of injection | pouring of the foam raw material in 2nd Embodiment, and foaming. It is a schematic sectional drawing which shows the time of the 1st confirmation of the filling state in 2nd Embodiment. It is a schematic sectional drawing which shows the time of the 1st replenishment in 2nd Embodiment. It is a schematic sectional drawing which shows the time of the 2nd confirmation of the filling state in 2nd Embodiment. It is a schematic sectional drawing which shows the time of the 2nd replenishment in 2nd Embodiment. It is a schematic sectional drawing of the state which inserted the raw material injection pipe and the exhaust and confirmation pipe in the hollow part in 3rd Embodiment. It is CC sectional drawing of FIG. It is a schematic sectional drawing of the state which inserted the raw material injection pipe and the exhaust pipe for confirmation in 4th Embodiment in the cavity part. It is a schematic sectional drawing of the state which inserted the raw material injection pipe and the exhaust and confirmation pipe in the hollow part in 5th Embodiment.

  The present invention is a cavity filling method in which a foam raw material is injected into a hollow portion formed in a buried pipe or a hole in the ground and foamed to fill the hollow portion with a foam. It has an exhaust process and a filling confirmation process, and further has a replenishment process and a foam-in-pipe filling process performed when necessary. Hereinafter, embodiments of the cavity filling method of the present invention will be described.

The first embodiment is a method of filling a hollow portion in a pipe buried in the horizontal direction in the ground with a foam. In the cavity filling method of the first embodiment, first, a pipe insertion step is performed. In the pipe insertion step, as shown in FIGS. 1 and 2, the material injection pipe 110A and the exhaust / confirmation pipe 130A are inserted into the cavity 101A in the pipe 11A embedded in the underground 99A, and the inside of the cavity 101A is inserted. To place. Reference numeral 98A denotes the ground.
The raw material injection pipe 110A is formed by forming a raw material discharge hole 112A on the side surface of a resin pipe 111A made of vinyl chloride resin or the like, as shown in an example of a cross section in FIG. 3 (3A). The raw material discharge holes 112A are formed at a plurality of locations along the length direction of the pipe, and are formed at a plurality of locations in the circumferential direction. In the example shown in the figure, four of the raw material discharge holes 112A are formed at intervals of 90 degrees in the circumferential direction of the raw material injection pipe 110A, and are formed at intervals of 20 cm in the length direction. The inner diameter of the raw material injection pipe 110A is a diameter at which the foam raw material can flow in the raw material injection pipe 110A, and an example is about 10 to 25 mm. The diameter of the raw material discharge hole 112A is determined according to the diameter of the raw material injection pipe 110A, the viscosity of the foam raw material, and the like. Further, it is more preferable to close the inner end of the hollow portion 101A in the raw material injection pipe 110A because the foam raw material can be easily discharged from the raw material discharge hole 112A on the side surface of the raw material injection pipe 110A.

  As shown in FIG. 3 (3B), the exhaust and confirmation pipe 130A has an exhaust hole 133A formed on the side surface of the transparent pipe 131A, and the exhaust hole 133A is formed by a raw material impervious air-permeable member 135A. The transparent pipe 131 is covered from the outer side surface. The distal end of the hollow portion 101A in the transparent pipe 131A is closed or closed with the raw material impervious air-permeable member 135A. The transparent pipe 131A is made of a transparent resin, for example, a transparent acrylic resin. The transparency of the transparent pipe 131A is such that the outside of the transparent pipe 131A can be seen through from the inside of the transparent pipe 131A through the tube wall of the transparent pipe 131A. The exhaust holes 133A are formed at a plurality of locations at predetermined intervals along the length direction of the transparent pipe 131A, and are formed at a plurality of locations in the circumferential direction. In the illustrated example, four exhaust holes 133A are formed at intervals of 90 degrees in the circumferential direction of the transparent pipe 131A, and are formed at intervals of 30 cm in the length direction. The inner diameter of the transparent pipe 131A is a diameter in which the foam raw material can flow in the transparent pipe 131A and the scope can be inserted. The diameter of the exhaust hole 133A is determined according to the diameter of the transparent pipe, the viscosity of the foam raw material, and the like.

The raw material impervious breathable member 135A has a foam material injected into the cavity portion 101A and a foam formed in the cavity portion 101A by foaming of the injected foam material through the exhaust hole 133A. The exhaust / confirmation pipe 130A is not allowed to enter, and the air in the cavity 101A and the foaming gas generated in the foaming process of the foam raw material can be permeated. And it consists of a material which has air permeability. Examples of the material that does not pass through the foam raw material and has air permeability include a nonwoven fabric and a porous film. Further, the raw material impermeable air-permeable member 135A covering the exhaust hole 133A is pushed from the exhaust / confirmation pipe 130A by the foam raw material supplied into the exhaust / confirmation pipe 130A in the replenishment step described later. Further, the exhaust pipe 133A is attached to the outer surface of the transparent pipe 131A so that the exhaust hole 133A can be opened or displaced from the position of the exhaust hole 133A. In the illustrated example, a raw material impermeable air-permeable member 135A made of a nonwoven fabric having a basis weight of 32 g / m ² made of polyethylene terephthalate resin fiber and polyethylene resin fiber, a thickness of 0.1 mm, and a width of 100 mm is covered with the exhaust hole 133A. Then, it was wound once around the outer surface of the transparent pipe 131A, and both ends of the raw material impermeable air-permeable member 135A were fixed with an adhesive tape.

  It is preferable that the raw material injection pipe 110A and the exhaust / confirmation pipe 130A are arranged apart from each other in the hollow portion 101A. The number of the raw material injection pipes 110A and the exhaust / confirmation pipes 130A is not limited to one each, and may be plural according to the size of the hollow portion 101A. Further, the raw material injection pipe 110A and the exhaust / confirmation pipe 130A may be non-fixedly arranged in the cavity 101A, or when an operator enters the cavity 101A, it is shown in FIG. Such fasteners 171A and screws 172A may be used, or anchor bolts or heatons (eye bolts) (not shown) may be used to fix to the inner wall of the cavity 101A, or an operator may enter the cavity 101A. If not, for example, the raw material injection pipe 110A and the exhaust / confirmation pipe 130A are placed on or fixed to the skeleton of a tower 175A (triangular tower in the illustrated example) as shown in FIG. You may insert and arrange in. (6A) to (6D) of FIG. 6 are examples of a tower, (6A) is a triangular tower 175A, (6B) is a square tower 176A, (6C) is a T-shaped tower 177A, and (6D) is a cross-shaped tower 178A. is there.

  In the next foaming and exhausting step, as shown in FIG. 7 (7A), the foam raw material is supplied to the outer end portion 113A of the raw material injection pipe 110A inserted and arranged in the hollow portion 101A by the pipe insertion step. A discharge device (a spray gun or the like) 211A of the device is connected. The foam raw material is supplied into the raw material injection pipe 110A by the discharge device 211A of the foam raw material supply device, and the foam raw material P1 is discharged from the raw material discharge hole 112A of the raw material injection pipe 110A. Inject into 101A. The foam material P1 is preferably a hard polyurethane resin material that can be foamed at the construction site. Rigid polyurethane resin raw materials are modified polyisocyanates such as urethane modified and carbodiimide modified, isocyanates such as crude TDI, polymeric MDI and TDI prepolymer, polyols composed of polyether polyol and / or polyester polyol, and amine catalyst And a foaming agent such as water.

  The foam material P1 injected into the hollow portion 101A starts the foaming reaction to form the foam P, and as the reaction proceeds, the volume of the foam P increases as shown in FIG. 7 (7B). The cavity 101A is filled. At that time, the foam raw material P1 and the foam P are blocked by the raw material impervious air-permeable member 135A covering the exhaust hole 133A of the exhaust and confirmation pipe 130A, and the exhaust hole 133A passes through the exhaust hole 133A. The exhaust and confirmation pipe 130A is prevented from entering, and the exhaust and confirmation pipe 130A is not blocked by the foam. In addition, the air in the cavity 101A that has lost its place due to an increase in the space occupied by the foam P in the cavity 101A and the foam gas generated during the foaming process of the foam material P1 are the exhaust and confirmation. The pipe 130A passes through the raw material impermeable air-permeable member 135A, reaches the exhaust / confirmation pipe 130A from the exhaust hole 133A, passes through the exhaust / confirmation pipe 130A, and is located outside the cavity 101A. Is discharged. Therefore, an air pocket is not generated in the cavity 101A, and the filling of the foam is not hindered by the air pool. Further, since the foam raw material that adheres to the inner wall surface of the raw material injection pipe 110A and remains in the raw material injection pipe 110A is foamed, and the raw material injection pipe 110A is also filled with the foam, the raw material injection pipe 110A. This part does not become an insufficiently filled portion of the foam.

  In the next filling confirmation step, as shown in FIG. 8, a scope 231A is inserted into the exhaust / confirmation pipe 130A from the outer end 138A of the exhaust / confirmation pipe 130A, and the exhaust / confirmation pipe 130A uses the scope 231A. The inside of the cavity 101A is seen through the transparent pipe wall of the confirmation pipe 130A, and the filling state of the foam P in the cavity 101A is confirmed from the outside of the cavity 101A. As the scope 231A, a fiber scope, an endoscope, or the like can be used. In the hollow portion 101A, the portion 14A filled with the foam P is covered with the foam P at the outer surface of the exhaust / confirmation pipe 130A and covers the exhaust hole 133A. The outer surface of 135A is covered with the foam P. On the other hand, in the insufficiently filled portion 15A of the foam P, that is, in the unfilled portion where the foam P is not filled, an unfilled space exists around the exhaust and confirmation pipe 130A, and covers the exhaust hole 133A. A space (unfilled space) exists on the outer surface side of the raw material impermeable gas-permeable member 135A.

In the filling confirmation step, when the underfilled portion 15A of the foam P is found in the hollow portion 101A by seeing through the hollow portion 101A by the scope 231A, a refilling step is performed.
In the replenishment step, the exhaust / confirmation pipe 130A is used as a material replenishment pipe. That is, the exhaust / confirmation pipe 130A also serves as a raw material replenishment pipe, and can also be referred to as an exhaust / confirmation replenishment pipe as described above. In the replenishment step, the scope 231A is extracted from the exhaust / confirmation pipe 130A, and as shown in FIG. 9, the discharge device ( A spray gun, etc.) 211A is connected, and an amount of foam material capable of filling the foam in the space (unfilled space) 15A of the underfilled portion 15A and the exhaust / confirmation pipe 130A The exhaust pipe 130A is supplied into the exhaust / confirmation pipe 130A from the outer end 138A. The foam raw material supplied into the exhaust / confirmation pipe 130A can be the same as the foam raw material supplied to the raw material injection pipe 110A in the foam exhaust step.

  The foam material supplied into the exhaust / confirmation pipe 130A is discharged from the discharge device 211A at a predetermined pressure, for example, 8 MPa, while pressing the inner wall surface of the exhaust / confirmation pipe 130A outward. Proceed to the back of the cavity 101A. At that time, at the position of the exhaust hole 133A, the raw material impermeable air-permeable member 135A is pushed outward of the exhaust / confirmation pipe 130A by the foam material in the exhaust / confirmation pipe 130A. . However, in the portion 14A where the foam P is filled in the hollow portion 101A, the foam P is in contact with the outer surface of the raw material impermeable air-permeable member 135A covering the exhaust hole 133A. The raw material impervious breathable member 135A cannot be pushed away from the outer surface of the exhaust / confirmation pipe 130A, and the foam raw material cannot go out of the exhaust / confirmation pipe 130A.

  On the other hand, in the underfilled portion 15A of the foam in the hollow portion 101A, that is, the unfilled portion, the outside of the raw material impermeable air-permeable member 135A that covers the exhaust hole 133A of the exhaust and confirmation pipe 130A from the outside is filled. Since there is a space for the insufficient portion 15A, the raw material impermeable air-permeable member 135A is pushed into the space for the insufficiently filled portion 15A by the foam raw material supplied into the exhaust and confirmation pipe 130A, and the exhaust hole The exhaust hole 133A is opened by shifting from the position of 133A or coming off from the exhaust and confirmation pipe 130A. The opened exhaust hole 133A is used as a material replenishment (raw material discharge), and the foam material passes through the opened exhaust hole 133A from the exhaust and confirmation pipe 130A. It is injected into the underfilled portion 15A. The exhaust holes may be referred to as exhaust / raw material replenishment holes. The foam material injected into the underfilled portion 15A is foamed into a foam, and the underfilled portion 15A is filled with the foam. Further, since the foam material adhering to the inner wall of the exhaust and confirmation pipe 130A and remaining in the exhaust and confirmation pipe 130A is foamed, the exhaust and confirmation pipe 130A is also filled with the foam. It is possible to prevent the exhaust / confirmation pipe 130A from becoming an insufficiently filled portion.

In the replenishing step, when the insufficient filling portion of the foam P is not found by the perspective inside the hollow portion 101A by the scope 231A, the in-pipe foam filling step is performed.
In the in-pipe foam filling step, the scope 231A is extracted from the exhaust / confirmation pipe 130A, and a discharge device (spray gun, etc.) of the foam material supply device is provided at the outer end 138A of the exhaust / confirmation pipe 130A. , And supply the foam material in an amount sufficient to fill the exhaust / confirmation pipe 130A into the exhaust / confirmation pipe 130A from the outer end 138A of the exhaust / confirmation pipe 130A. To do. The foam material supplied into the exhaust / confirmation pipe 130A is foamed into a foam, and the exhaust / confirmation pipe 130A is filled with the foam. Thereby, it is possible to prevent the exhaust / confirmation pipe 130 </ b> A from becoming an insufficiently filled portion.

When the cross-sectional shape of the hollow portion is large, it is preferable to insert a plurality of exhaust and confirmation pipes into the hollow portion, confirm the foamed state at a plurality of positions in the hollow portion, and fill the insufficiently filled portion with the foam.
A second embodiment in which two exhaust and confirmation pipes are inserted into the cavity will be described. Also in the second embodiment, the pipe insertion process, the foam exhaust process, the filling confirmation process, the replenishment process, or the in-pipe foam filling process are performed in this order as in the first embodiment.
In the pipe insertion step, as shown in FIGS. 10 and 11, the raw material injection pipe 110B and the first exhaust are placed in a hollow portion 101B made of a concrete pipe 11B having a diameter of 60 cm and a length of 20 m embedded in the underground 99B. The cum confirmation pipe 130B and the second exhaust / confirmation pipe 140B are inserted and arranged in the cavity 101B. Reference numeral 98B is the ground.

  The raw material injection pipe 110B is made of, for example, a material discharge hole 112B having a diameter of 1 mm formed on the side surface of a vinyl chloride resin pipe 111B having an inner diameter of 13 mm, as shown in FIG. 12 (12A). The material discharge holes 112B are formed at a plurality of locations along the length direction of the pipe. In the example shown in the drawing, the material discharge holes 112B are two at a 45 degree angle from the vertically downward direction in the sectional view of the material injection pipe 110B, that is, at an interval of 90 degrees between the holes, and obliquely downward. It is formed at intervals of 30 cm in the length direction. Further, it is more preferable to close the back end of the cavity 101B in the raw material injection pipe 110B because the foam raw material can be easily discharged from the raw material discharge hole 112B on the side surface of the raw material injection pipe 110B.

As shown in (12B) of FIG. 12, the first exhaust / confirmation pipe 130B and the second exhaust / confirmation pipe 140B are, for example, vertical sectional views of transparent pipes 131B and 141B made of acrylic resin having an inner diameter of 20 mm. Exhaust holes 133B and 143B having a diameter of 1 mm obliquely downward are formed at intervals of 30 cm in the length direction of the pipe. Further, the exhaust holes 133B and 143B are made of raw material impervious breathable members 135B and 145B made of polyethylene terephthalate fiber and a nonwoven fabric of polyethylene fiber (weight per unit area 32 g / m ² , thickness 0.1 mm, width 100 mm), and transparent pipe 131B. , 141B is covered from the outside of the side surface. The distal ends of the hollow portions 101B in the transparent pipes 131B and 141B are closed or closed with the raw material impermeable air-permeable members 135B and 145B. The raw material impervious breathable members 135B and 145B are wound once around the outer surfaces of the transparent pipes 131B and 141B so as to cover the exhaust holes 133B and 143B, and the exhaust and confirmation pipes 130B, Adhere both ends of the raw material impervious breathable members 135B and 145B with adhesive tape so that they can be displaced from or displaced from the positions of the exhaust holes 133B and 143B by the pressure of the foam raw material supplied to 140B. It is fixed.

  The raw material injection pipe 110B is located on the lower side in the cavity 101B, and the first exhaust / confirmation pipe 130B and the second exhaust / confirmation pipe 140B are located on the upper half side of the cavity 101B. In addition, the second exhaust / confirmation pipe 140B is disposed in the cavity 101B so as to be positioned above the first exhaust / confirmation pipe 130B. The insertion arrangement of the raw material injection pipe 110B, the first exhaust / confirmation pipe 130B, and the second exhaust / confirmation pipe 140B into the hollow portion 101B is the same as that of the fastener 171A as shown in FIG. It is fixed to the inner surface of the hollow portion 101B by screws 172A or anchor bolts or heatons (eye bolts) (not shown), or using the tower shown in FIG. In the case of the present embodiment, the raw material injection pipe 110B and the first exhaust are attached to a tower skeleton such as a T-shaped tower 177A shown in (6C) of FIG. 6 or a cross tower 178A shown in (6D) of FIG. It is preferable from the viewpoint of workability that the cum confirmation pipe 130B and the second exhaust / confirmation pipe 140B are attached and inserted into the hollow portion 11B.

  In the foaming and exhausting process, as shown in FIG. 13 (13A), the discharge device of the foam material supplying apparatus is disposed on the outer end 113B of the material injection pipe 110B inserted and arranged in the cavity 101B by the pipe inserting process. (Spray gun or the like) 211B is connected, the foam material is supplied into the material injection pipe 110B, the foam material P1 is discharged from the material discharge hole 112B of the material injection pipe 110B, and the cavity 101B is discharged. inject. The said foam raw material P1 is the same as that of 1st Embodiment, and the hard polyurethane resin raw material which can be foamed on the construction site is preferable.

  The foam material P1 injected into the hollow portion 101B starts the foaming reaction to become the foam P, and the foam P increases in volume as shown in FIG. The portion 101B is filled. At this time, the foam raw material P1 and the foam P cover the raw material impervious ventilation covering the exhaust holes 133B and 143B of the first exhaust / confirmation pipe 130B and the second exhaust / confirmation pipe 140B. The first exhaust / confirmation pipe 130B and the second exhaust / confirmation pipe 140B cannot enter into the first exhaust / confirmation pipe 140B through the exhaust holes 133B, 143B. The exhaust / confirmation pipe 130B and the second exhaust / confirmation pipe 140B are not blocked by the foam. In addition, the air in the cavity 101B that has lost its place due to an increase in the space occupied by the foam P in the cavity 101B and the foaming gas generated during the foaming process of the foam material P1 are the first gas. The exhaust and confirmation pipe 130B and the second exhaust and confirmation pipe 140B pass through the raw material impermeable air-permeable members 135B and 145B and pass through the exhaust holes 133B and 143B to the first exhaust and confirmation pipe 130B. And into the second exhaust / confirmation pipe 140B, through the first exhaust / confirmation pipe 130B and the second exhaust / confirmation pipe 140B, from the outer ends 138B and 148B of both pipes, It is discharged outside the section 101B. Therefore, an air pocket is not generated in the cavity 101B, and the filling of the foam is not hindered by the air pool. Further, since the foam raw material remaining in the raw material injection pipe 110B is foamed and the raw material injection pipe 110B is also filled with the foam, the portion of the raw material injection pipe 110A becomes an insufficiently filled portion of the foam. There is no.

The filling confirmation step is performed using the first exhaust / confirmation pipe 130B and the second exhaust / confirmation pipe 140B, respectively. After the filling confirmation step using each exhaust / confirmation pipe, the replenishment step or inside the pipe Each foam filling step is performed.
First, using the first exhaust / confirmation pipe 130B located on the lower side of the first exhaust / confirmation pipe 130B and the second exhaust / confirmation pipe 140B, a filling confirmation step, a replenishment step, or A foam filling process in the pipe is performed.
In the filling confirmation step, as shown in FIG. 14, a scope 231B is inserted into the first exhaust / confirmation pipe 130B from the outer end 138B of the first exhaust / confirmation pipe 130B, and the scope 231B. Thus, the inside of the cavity 101B is seen through the transparent tube wall of the first exhaust and confirmation pipe 130B, and the filling state of the foam P in the cavity 101B is confirmed from the outside of the cavity 101B. As the scope 231B, a fiber scope, an endoscope, or the like can be used as in the first embodiment. In the portion 14B where the foam P is filled in the hollow portion 101B, the outer surface of the first exhaust and confirmation pipe 130B is covered with the foam P. On the other hand, in the insufficiently filled portion 15B of the foam P, that is, the portion not filled with the foam P, an unfilled space for the foam exists around the first exhaust and confirmation pipe 130B.

When the underfilled portion 15B of the foam P is found in the hollow portion 101B by the perspective of the scope 231B inserted into the first exhaust / confirmation pipe 130B, a replenishment step is performed.
In the replenishment step, the first exhaust / confirmation pipe 130B is used as a material replenishment pipe. In other words, the first exhaust / confirmation pipe 130B also serves as a raw material replenishment pipe, and can also be referred to as an exhaust / confirmation replenishment pipe as described above. In the replenishment step, the scope 231B is extracted from the first exhaust / confirmation pipe 130B, and as shown in FIG. 15, the foam material is placed on the outer end 138B of the first exhaust / confirmation pipe 130B. A discharge device (such as a spray gun) 211B of a supply device is connected, and an amount of foam material that can fill the foam into the underfilled portion 15B and the exhaust / confirmation pipe 130B is supplied to the first exhaust. It supplies in the pipe 130B for cum confirmation. The foam raw material supplied into the first exhaust / confirmation pipe 130B can be the same as the foam raw material supplied to the raw material injection pipe 110B in the foam exhaust step.

  The foam material supplied into the first exhaust / confirmation pipe 130B is discharged from the discharge device 211B at a predetermined pressure, for example, 8 MPa, and the inner wall surface of the first exhaust / confirmation pipe 130B is discharged. It advances toward the back of the cavity 101B while pressing outward. At that time, at the position of the exhaust hole 133B, the raw material impermeable gas-permeable member 135B is moved outwardly of the first exhaust / confirmation pipe 130B by the foam material in the first exhaust / confirmation pipe 130B. Will be pushed to. However, in the portion 14B where the foam P is filled in the hollow portion 101B, the foam P is in contact with the outer surface of the raw material impermeable gas-permeable member 135B covering the exhaust hole 133B. The raw material impervious breathable member 135B cannot be pushed away from the outer surface of the first exhaust / confirmation pipe 130B, and the foam raw material is out of the first exhaust / confirmation pipe 130B from the exhaust hole 133B. I can't go out.

  On the other hand, in the insufficiently filled portion 15B of the foam in the hollow portion 101B, that is, in the unfilled portion, the raw material impermeable air-permeable member 135B that covers the exhaust hole 133B of the first exhaust / confirmation pipe 130B from the outside is provided. Since the space of the underfilled portion 15B exists on the outside, the raw material impermeable gas-permeable member 135B is pushed into the space of the underfilled portion 15B by the foam raw material supplied into the first exhaust / confirmation pipe 130B. As a result, the exhaust hole 133B is displaced from the position of the exhaust hole 133B or detached from the first exhaust / confirmation pipe 130B, and the exhaust hole 133B is opened. The opened exhaust hole 133B is used as a raw material replenishment (raw material discharge), and the foam material passes through the opened exhaust hole 133B from the first exhaust and confirmation pipe 130B. It is injected into the underfilled portion 15B. The exhaust holes may be referred to as exhaust / raw material replenishment holes. The foam material injected into the underfilled portion 15B is foamed into a foam, and the underfilled portion 15B is filled with the foam. Further, since the foam material remaining in the first exhaust / confirmation pipe 130B is also foamed and filled in the first exhaust / confirmation pipe 130B, the first exhaust / confirmation is confirmed. The inside of the pipe for use 130B does not become an insufficiently filled portion of the foam.

In the filling confirmation step, if the insufficient filling portion of the foam P is not found by seeing through the cavity 101B by the scope 231B inserted into the first exhaust and confirmation pipe 130B, the foam in the pipe A filling step is performed.
In the in-pipe foam filling step, the scope 231B is extracted from the first exhaust / confirmation pipe 130B, and the foam raw material supply apparatus discharges the outer end 138B of the first exhaust / confirmation pipe 130B. An apparatus (a spray gun or the like) is connected, and an amount of foam raw material capable of filling the first exhaust / confirmation pipe 130B with foam is supplied to the outer end of the first exhaust / confirmation pipe 130B. The gas is supplied from the portion 138B into the first exhaust / confirmation pipe 130B. The foam material supplied into the exhaust / confirmation pipe 130B is foamed to become a foam in the first exhaust / confirmation pipe 130B, and the foam is formed in the first exhaust / confirmation pipe 130B. Filled. Thereby, it is possible to prevent the first exhaust / confirmation pipe 130 </ b> B from being an insufficiently filled portion.

Next, using the second exhaust / confirmation pipe 140B positioned above the first exhaust / confirmation pipe 130B, a filling confirmation step, a replenishment step, or an in-pipe foam filling step is performed.
In the filling confirmation step, as shown in FIG. 16, a scope 231B is inserted from the outer end 148B of the second exhaust / confirmation pipe 140B into the second exhaust / confirmation pipe 140B, and the first exhaust / confirmation pipe 140B is inserted. The filling state of the foam P in the hollow portion 101B is confirmed by the scope 231B in the same manner as in the confirmation pipe 130B. When the insufficient filling portion 16B of the foam P is found in the hollow portion 101B by the confirmation of the foaming state by the scope 231B, a replenishment process is performed.
In the replenishment step, the second exhaust / confirmation pipe 140B is used as a material replenishment pipe. That is, the second exhaust / confirmation pipe 140B also serves as a raw material replenishment pipe, and can also be referred to as an exhaust / confirmation replenishment pipe as described above. In the replenishment step, the scope 231B is extracted from the second exhaust / confirmation pipe 140B, and the foam material is supplied to the outer end 148B of the second exhaust / confirmation pipe 140B as shown in FIG. A discharge device (such as a spray gun) 211B of the apparatus is connected, and an amount of foam raw material capable of filling the foam into the underfilled portion 16B and the second exhaust / confirmation pipe 140B, The exhaust and confirmation pipe 140B is supplied.

  The foam raw material supplied into the second exhaust / confirmation pipe 140B is a raw material impervious breathable member covering the exhaust hole 143B of the second exhaust / confirmation pipe 140B at the filling portion of the foam. Since the foam is in contact with the outer surface of 145B, the exhaust hole 143B cannot be opened. On the other hand, in the underfilled portion 16B, there is a space of the underfilled portion 16B on the outer surface side of the raw material impermeable air-permeable member 145B that covers the exhaust hole 143B of the second exhaust and confirmation pipe 140B from the outside. The raw material impervious breathable member 145B can be pushed into the space of the insufficiently filled portion 16B. As a result, the raw material impervious air-permeable member 145B at the insufficiently filled portion 16B is displaced from the position of the exhaust hole 143B or detached from the exhaust / confirmation pipe 130B, and the exhaust hole 143B is opened. Therefore, the opened exhaust hole 143B can be used as a raw material replenishment hole (raw material discharge hole), and the foam raw material is injected into the underfilled portion 16B through the exhaust hole 143B. And the underfilled portion 16B is filled with foam. Further, since the foam material remaining in the second exhaust / confirmation pipe 140B is foamed and the second exhaust / confirmation pipe 140B is filled with the foam, the second exhaust / confirmation is confirmed. The inside of the pipe 140B does not become an insufficiently filled portion of the foam.

In the filling confirmation step, when the filling portion of the foam P is not found in the cavity portion 101B by the perspective inside the cavity portion 101B by the scope 231B inserted in the second exhaust and confirmation pipe 140B In the process, a foam filling process in a pipe is performed.
In the in-pipe foam filling step, the scope 231B is extracted from the second exhaust / confirmation pipe 140B, and the foam raw material supply device discharges the outer end 148B of the second exhaust / confirmation pipe 140B. An apparatus (a spray gun or the like) is connected, and an amount of foam raw material capable of filling the second exhaust / confirmation pipe 140B with foam is supplied into the second exhaust / confirmation pipe 140B. To do. The foam material supplied into the exhaust / confirmation pipe 140B is foamed, and the second exhaust / confirmation pipe 140B is filled with the foam. Thereby, since the inside of the second exhaust / confirmation pipe 140 is filled with the foam, the inside of the second exhaust / confirmation pipe 140B does not become an insufficiently filled portion of the foam.

As 3rd Embodiment, as shown in FIG.18 and FIG.19, the filling method in case there exists the cavity part 101C between the sprayed concrete 11C and the ground 98C is demonstrated.
In the third embodiment, the pipe insertion process, the foam exhaust process, the filling confirmation process, the replenishment process, or the in-pipe foam filling process are performed in this order as in the first embodiment.

  In the pipe insertion step, a plurality of, for example, six holes 121C having a diameter of about 10 cm are formed at an upper portion of the sprayed concrete 11C, for example, six holes are made to penetrate into the cavity 101C, and the hollows 101C A material injection pipe 110C having a length corresponding to the inside of the part 101C, for example, 15C and an exhaust / confirmation pipe 130C are inserted into the cavity part 101C. In the raw material injection pipe 110C, a plurality of raw material discharge holes are formed on the side surface of the pipe along the length direction at predetermined intervals in the circumferential direction of the pipe, similarly to the raw material injection pipe used in the first embodiment. It has been done. On the other hand, in the exhaust and confirmation pipe 130C, as in the exhaust and confirmation pipe used in the first embodiment, a plurality of exhaust holes are formed along the length of the side surface of the transparent pipe and the circumference of the pipe. The exhaust holes are covered with the outer surface of the transparent pipe by the raw material impervious air-permeable member as in the first embodiment, and the raw material impervious breathable member is disposed in the exhaust / confirmation pipe 130C. It is attached so that it can be displaced from the position of the exhaust hole due to the pressure of the foam raw material supplied to the pipe, or can be released from the exhaust and confirmation pipe 130C so that the exhaust hole can be opened.

  In the next foaming exhaust process, a discharge device (spray gun or the like) 211C of a foam material supply device is connected to one end of the material injection pipe 110C protruding above the sprayed concrete 11C, and the foam material is injected into the material. It is supplied into the pipe 110C and injected into the cavity 101C from the material discharge hole of the material injection pipe 110C. The foam material is the same as that used in the first embodiment. The foam raw material injected into the cavity 101C is foamed and filled into the cavity 101C as a foam. At that time, the air and the foam gas that have lost their place due to the increase in the space occupied by the foam in the hollow portion 101C are discharged from the raw material impermeable gas-permeable member in the exhaust and confirmation pipe 130C in the hollow portion 101C. It enters into the exhaust and confirmation pipe 130C through the covered exhaust hole, is discharged to the outside from one end of the exhaust and confirmation pipe 130C protruding above the sprayed concrete 11C, and is confined in the cavity 101C. Air does not hinder foam filling. Further, since the foam raw material remaining in the raw material injection pipe 110C is foamed and the raw material injection pipe 110C is also filled with the foam, the raw material injection pipe 110C does not become an insufficiently filled portion of the foam. .

In the next filling confirmation step, a scope similar to that of the first embodiment is inserted into the exhaust and confirmation pipe 130C, and the inside of the cavity 101C is seen through the transparent tube wall of the exhaust and confirmation pipe 130C by the scope. Check the filling state of the foam. And when the insufficient filling part of a foam is discovered in the said cavity part 101C, a replenishment process is performed.
In the replenishment step, the scope is pulled out from the exhaust / confirmation pipe 130C, and instead, the discharge device (spray gun, etc.) of the foam material supply apparatus projects above the sprayed concrete 11C. Connected to one end of the pipe 130C, an amount of foam raw material that can be filled with the foam in the insufficiently filled portion of the foam and the exhaust and confirmation pipe 130C is supplied into the exhaust and confirmation pipe 130C. Then, the raw material impervious breathable member that covers the exhaust hole from the outside at the insufficiently filled portion in the cavity 101C is pushed outward by the pressure of the foam raw material to open the exhaust hole, and the opened exhaust gas The foam material is injected from the hole into the insufficiently filled portion. The foam raw material injected into the insufficiently filled portion and the foam raw material remaining in the exhaust / confirmation pipe 130C are foamed to form a foam, which is filled in the respective portions.

In addition, when the insufficient filling portion of the foam is not found in the cavity 101C in the filling confirmation step, the in-pipe foam filling step is performed.
In the foam filling process in the pipe, the scope is pulled out from the exhaust / confirmation pipe 130C, and instead, a discharge device (spray gun or the like) of the foam material supply device is exhausted above the sprayed concrete 11C. Connected to one end of the cum-and-confirmation pipe 130C, an amount of foam material that can be filled with the foam in the exhaust-and-confirmation pipe 130C is supplied into the exhaust-and-confirmation pipe 130C, and the exhaust and confirmation pipe 130C Foam inside. The filling confirmation step, the replenishment step, and the in-pipe foam filling step are performed for each exhaust and confirmation pipe 130C.

  Note that even if an insufficient filling of the foam is not found immediately after foaming, an underfilled portion may occur due to the shrinkage of the foam due to subsequent cooling. It is preferable not to perform the process after the confirmation process on the same day, and to perform the process after the filling confirmation process after the next day after the foaming exhaust process.

  In the third embodiment, even if the strength of the shotcrete is weak and the work on the shotcrete is difficult, the material injection pipe and the exhaust / confirmation pipe are inserted into the cavity and filled from a safe place. It can be performed. Furthermore, since the foam is formed from the liquid foam material supplied into the cavity, the foam can be filled according to the shape in the cavity. Moreover, since the foam to be filled is lighter than soil and concrete, it can be applied even on soft ground.

As a fourth embodiment, a filling method for a hollow portion 101D such as an underground air defense ruin as shown in FIG. 20 will be described. Reference numeral 98D is the ground, and 99D is the ground.
In the fourth embodiment, the pipe insertion process, the foam exhaust process, the filling confirmation process, the replenishment process, or the in-pipe foam filling process are performed in this order as in the first embodiment.
In the pipe insertion process, for example, a plurality of raw material injection pipes 110D, 115D, 120D and exhaust / confirmation pipes 130D, 140D, 150D are alternately provided at predetermined intervals, for example, 40 cm intervals, in the cavity portion 101D having a length of 20 m, and vertically. Place the step. The raw material injection pipes 110D, 115D, and 120D and the exhaust and confirmation pipes 130D, 140D, and 150D have the same configuration as the raw material injection pipe and the exhaust and confirmation pipe that are used in the first embodiment.

  Next, a foaming exhaust process, a filling confirmation process and a replenishing process, or a foam filling process in a pipe are performed for each stage or for a predetermined plurality of stages. For example, as shown in the drawing, the raw material injection pipes 110D, 115D, and 120D and the exhaust and confirmation pipes 130D, 140D, and 150D are arranged in three stages in the hollow portion 101D in the pipe insertion step, and foamed for each stage. An exhaust process, a filling confirmation process, a replenishment process, or a foam filling process in a pipe are performed. In that case, in the foaming and exhausting process for the lowermost raw material injection pipe 110D, a discharge device (a spray gun or the like) of a foam raw material supply device is connected to the lowermost raw material injection pipe 110D to bring the inside of the lowest raw material injection pipe 110D The foam raw material is supplied to the hollow portion 101D from the raw material discharge hole formed in the raw material injection pipe 110D, and the lower and lowermost raw material injection pipe 110D in the hollow portion 101D is injected. A foam is formed inside, and air and foam gas in the cavity 101D are exhausted to the cavity 101D through the exhaust and confirmation pipes 130D, 140D, and 150D.

  Thereafter, a scope similar to that used in the first embodiment is inserted into the lowermost exhaust and confirmation pipe 130D in the filling confirmation step using the lowermost exhaust and confirmation pipe 130D, and the inside of the cavity 101D is inserted. Check the filling state of the foam. When an insufficiently filled portion of the foam is found, a replenishment process is performed. In the replenishment step, the exhaust / confirmation pipe 130D is used for material injection (replenishment), and the foam material supply device discharge device (spray gun or the like) connected to the exhaust / confirmation pipe 130D instead of the scope. ) To supply the foam material into the exhaust / confirmation pipe 130D, and fill the foam into the insufficiently filled portion and the lowermost exhaust / confirmation pipe 130D. On the other hand, when the insufficient filling portion is not found, the in-pipe foam filling step is performed. In the foam filling process in the pipe, instead of the scope, from the discharge device (spray gun or the like) of the foam material supply device connected to the exhaust / confirmation pipe 130D, into the lowermost exhaust / confirmation pipe 130D. An amount of foam raw material that can be filled with the foam is supplied into the exhaust / confirmation pipe 130D for foaming, and the exhaust / confirmation pipe 130D is filled with the foam.

  Thereafter, in the same manner, the foaming exhaust process for the second-stage raw material injection pipe 115D from the bottom, the filling confirmation process for the second-stage exhaust / confirmation pipe 140D from the bottom and the replenishment process or the foam filling process in the pipe, 3 from the bottom The foaming exhaust process for the raw material injection pipe 120D at the stage and the filling confirmation process and the replenishing process or the foam filling process within the pipe for the third stage exhaust / confirmation pipe 150D from the bottom are sequentially performed.

  Also, in the pipe insertion process, the raw material injection pipe and the exhaust / confirmation pipe are inserted and arranged in four or more stages in a plurality of stages, and the foaming exhaust process, the filling confirmation process and the replenishment process are performed in multiple stages, for example, two stages from the bottom. Or you may make it perform the foam filling process in a pipe. In addition, when the cavity is long, the shaft may be excavated and the construction may be performed starting from the longitudinal resistance. Also in the fourth embodiment, even if insufficient filling of the foam is not found immediately after foaming, an underfilled portion may occur due to the shrinkage of the foam due to subsequent cooling, and particularly when the cavity is wide. Does not perform the foaming exhaust process and the filling confirmation process and the replenishment process or the foam filling process in the pipe on the same day, and performs the filling confirmation process and the replenishment process or the foam filling process in the pipe after the next day of the foaming exhaust process. preferable.

  If there is a cavity such as an air defense ruin under soft ground and it may collapse if left unattended, the conventional method of excavating the ground and refilling it with earth or sand or concrete may cause ground subsidence. However, according to the fourth embodiment, since the foam to be filled is lighter than soil and concrete, it can be applied even on soft ground, and the foam raw material is placed inside the cavity from the outside. Therefore, it can be safely installed. Furthermore, a large machine for ground excavation is unnecessary, and the construction period can be shortened.

  A fifth embodiment will be described. In the fifth embodiment, there is another filling method in the case where a cavity such as an air defense ruin exists in the ground basement. As shown in FIG. The foam 161E is filled to a height at which the worker cannot work. Thereafter, as in the fourth embodiment, the foam is filled into the cavity by sequentially performing the pipe insertion step, the foam exhaust step, the filling confirmation step, the replenishment step, or the in-pipe foam filling step. Reference numeral 98E is the ground, 99E is the ground, 110E and 115E are raw material injection pipes, and 130E and 140E are exhaust and confirmation pipes.

  In the first to fifth embodiments, the exhaust and confirmation pipe may be used as the raw material injection pipe. Since it is not necessary to prepare two types of pipes, work preparation is easy. In addition, the shape of the inner surface of the cavity is often not a smooth surface, and the foam shape of the foam tends to be uneven, so if all the raw material injection pipes are exhaust and confirmation pipes that can be confirmed with a scope, unexpected unfilled locations Also, when filling occurs, the filling state can be confirmed from a plurality of angles in detail, and filling can be easily performed.

  As described above, the cavity filling method of the present invention is not a large-scale construction when filling the cavity such as underground, can shorten the construction period, can prevent insufficient filling, and can be applied even on soft ground. Is possible.

101A, 101B, 101C, 101D, 101E: Cavity 110A, 110B, 110C, 110D, 115D, 120D, 110E, 115E: Raw material injection pipe 112A, 112B: Raw material injection hole 130A, 130B, 140B, 130C, 130D, 140D, 150D, 130E, 140E: Exhaust and confirmation pipes 133A, 133B, 143B: Exhaust holes 135A, 135B, 145B: Raw material impervious breathable members

Claims (5)

In the cavity filling method in which the foam material is injected into the cavity and foamed to fill the foam,
A raw material injection pipe in which raw material discharge holes are formed at a plurality of locations in the length direction of the pipe on the side surface of the pipe, and an exhaust hole is formed at a plurality of locations in the length direction of the transparent pipe on the side surface of the transparent pipe, A pipe insertion step of inserting into the cavity the exhaust and confirmation pipe in which the exhaust hole is covered from the outside of the side surface of the transparent pipe by a raw material impervious air-permeable member that does not pass through the foam raw material and has air permeability. When,
The foam raw material is supplied into the raw material injection pipe from the outside of the hollow portion, the foam raw material is injected into the hollow portion from the raw material discharge hole and foamed to fill the hollow portion with the foam, and the foaming is performed. A foaming and exhausting step of exhausting the air in the cavity part from outside the cavity part through the exhausting and confirmation pipe from the exhaust hole covered with the raw material impermeable air-permeable member of the exhaust and confirmation pipe,
A cavity filling method comprising: a filling confirmation step of confirming a filling state of the foam in the cavity from outside the cavity by a scope inserted into the exhaust and confirmation pipe.   When it is discovered in the filling confirmation step that there is an insufficiently filled portion in the cavity, the foam material is supplied into the exhaust / confirmation pipe from outside the cavity, and the exhaust / confirmation pipe The raw material impervious breathable member that covers the exhaust hole located in the insufficiently filled portion among the plurality of exhaust holes formed in the exhaust is formed by the foam raw material supplied into the exhaust and confirmation pipe Push from inside the exhaust and confirmation pipe to shift the position or remove it from the exhaust and confirmation pipe to open the exhaust hole, and then inject the foam material into the insufficiently filled portion from the open exhaust hole A filling method for a cavity, wherein a replenishing step for foaming is performed after the filling confirmation step.   When an insufficiently filled portion is not found in the hollow portion in the filling confirmation step, an amount of foam material that can be filled with foam in the exhaust and confirmation pipe is contained in the exhaust and confirmation pipe. 3. The cavity filling method according to claim 2, wherein a foam filling step in the pipe for supplying the foam raw material in the pipe for exhaust and confirmation from the outside of the cavity is performed after the filling confirmation step. .   4. The cavity according to claim 1, wherein, in the pipe insertion step, a plurality of the exhaust and confirmation pipes are inserted into the cavity and arranged at a plurality of positions in the cavity. 5. Part filling method. In the pipe insertion step, a plurality of the raw material injection pipes and the exhaust / confirmation pipes are respectively inserted into the cavity and arranged in a plurality of stages having different heights in the cavity,
The foaming and exhausting step is performed step by step from the lowermost raw material injection pipe to the uppermost raw material injection pipe in the plurality of raw material injection pipes, or sequentially in a plurality of stages.
The method for filling a cavity according to any one of claims 1 to 4, wherein the filling confirmation step is performed for each stage or for each end of the foaming and exhausting step for each of a plurality of stages.

Images