JPH08144687A - Pipe and pipe loop method by use the same - Google Patents

Abstract

PURPOSE: To prevent underground water from flowing in, by fixing a partitioned part of the inside of a main body along the longitudinal clearance formed in the cylindrical main body, to the longitudinal fixing part provided at the outside of the main body and filling the partitioned part with a sealing material. CONSTITUTION: A pipe 10 containing a sealing material 28 in the space 20 of a partitioned part 16 is arranged at the rear end of a shielding tunnel excavator having a nearly same section with the main body 12. The pipe 10 is advanced to an aimed shaft together with the excavator by a pusher in a starting shaft and then the fixing part 18 is fixed to the partitioned part 16 to lay a new pipe 10 adjacently to the pipe 10. The fixing part 18 is caught by the seal material 28. Further, on laying it, a powdered or a slurry solidifying water- sealing material is charged from a connected part 24 to cut off fine clearances. Underground water and mud slurry for excavation, etc., are prevented from flowing into the starting shaft through the space 20 during installation of pipes or after installation of pipes. In this way, an excavating machine making use of mud slurry can be used and the pressure decrease at the working face side can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe used for constructing an underground structure such as an underground wall, a reinforcing body and a water stop body, and a pipe roof construction method using the pipe.

[0002]

2. Description of the Related Art In a pipe roof construction method for constructing an underground structure such as an underground wall, a reinforcing body, a waterproof body, and the like, a plurality of pillars having a cylindrical main body, that is, pipes, are generally used. Each pipe is laid almost horizontally by a pipe propulsion method using an excavator arranged at a front end and a main pushing device arranged rearward.

As one of the pipes used in this type of construction method, a cylindrical main body having a pair of edges forming a continuous gap from one end to the other in the longitudinal direction, and fixed inside the main body. Is a partition portion that continuously extends from one end to the other end in the longitudinal direction of the main body portion, and a space that communicates with the outside of the main body portion through the gap is cooperated with both edges of the main body portion inside the main body portion. A partition formed on the main body, and an engaging portion fixed to the outside of the main body and extending in the longitudinal direction of the main body, the engaging portion being received in the gap and the space of adjacent pipes of the same kind. Some include (Actual Kaihei 4-17491
JP-A-4-38397).

During installation, each pipe is advanced together with the excavator by the pusher device arranged in the starting shaft, with the engaging portion received in the gap and space of the installed pipe of the same kind. Is pushed into the excavation mark by the excavator.

However, in the conventional pipe and pipe roof construction methods, fluid such as groundwater flows out to the side of the starting shaft through the space of the pipe. In particular, when using an excavator that discharges excavated material with muddy water or when the groundwater pressure is high, muddy water flows out from the face of the face to the side of the starting shaft through the space of the pipe.

In order to prevent this, even if a sealing material such as expanded polystyrene is filled in the space of the pipe, a slight gap between the surface of the pipe where the fluid such as ground water and muddy water forms the space of the pipe and the sealing material. After that, it will flow out to the side of the starting shaft.

[0007]

An object of the present invention is to prevent the space formed by the main body portion and the partition portion of the pipe from acting as a fluid flow path.

[0008]

The pipe of the present invention is fixed to the inside of a cylindrical main body having a pair of edges forming a continuous gap from one end to the other in the longitudinal direction. A space that extends continuously from one end to the other end in the longitudinal direction of the main body, and is a space that communicates with the outside of the main body through the gap and is located inside the main body in cooperation with both edges of the main body. The partition portion to be formed and an engaging portion that is fixed to the outside of the main body portion and extends in the longitudinal direction of the main body portion and that is received in the gap and the space of the same type of pipes that are arranged next to each other An engagement portion that is engageable with the edge portion and a communication portion that is fixed to the partition portion and that communicates the inside of the main body portion with the space are included.

Each of the pipes is moved forward together with the excavator by an extruding device while excavating the ground by the excavator, so that the engaging portion of one of the adjacent pipes and the gap of the other adjacent pipe and While being received in the space, it is pushed into the excavation mark by the excavator and laid on the excavation mark. The sealing material can be used before or during pipe installation.
It is placed in the space of the pipe. The sealing material has a water blocking property, and prevents the space formed by the main body portion and the partition portion of the pipe from acting as a flow path for a fluid such as groundwater.

The communicating portion of each pipe is used for injecting a powdery or slurry water-stopping material containing a solidifying material into the space during or during the laying of the pipe. The injected water-stopping material enters the small gaps between the surface forming the space and the sealing material, the small gaps existing in the sealing material, etc., and solidifies at those locations to make them liquid-tight. To block. This can prevent the space of the pipe from acting as a flow path for a fluid such as groundwater.

According to the pipe of the present invention, since the communicating portion for communicating the inside of the main body of the pipe with the space is provided, the water blocking material can be injected into the space of the pipe during or after the laying of the pipe. As a result, the space of the pipe can be prevented from acting as a flow path for a fluid such as groundwater.

In the pipe of the present invention, the sealing material may be arranged in advance in at least the space. In addition, the engaging portion includes an elongated first plate-shaped body and an elongated second plate-shaped body that is continuous with one end edge of the first plate-shaped body in the width direction and is substantially perpendicular to the first plate-shaped body. It may have a T-shaped or L-shaped cross section by means of and, and in this case, it can be fixed to the outer surface of the main body portion at the other end edge of the first plate-shaped body.

The pipe roof construction method using a plurality of pipes as described above excavates the ground by an excavator such as a mechanical shield type tunnel excavator equipped with a cutter head driven by a drive source, and The pipe having the sealing material disposed on the excavator is disposed in the excavation track in a state where the engaging portion of one adjacent pipe is received in the gap and the space of the other adjacent pipe, and at the same time or This is followed by injecting a powdery or slurry water-stopping material containing a solidifying material into the space from the communicating portion of the pipe being laid or the pipe already laid.

According to the pipe roof construction method of the present invention, since the water blocking material is injected into the space of the pipe at the time of laying the pipe or after the laying of the pipe, a shield type tunnel excavator using mud for discharging the excavated material is used. Also, it is possible to prevent the space of the pipe from acting as a flow path for a fluid such as ground water or muddy water, and to prevent the pressure on the side of the face from decreasing and prevent the face from collapsing.

A pipe having a sealing material filled in the space is arranged at the excavation mark in a state where the space is accommodated in the space and the space between the pipes already installed adjacent to each other, and the engagement part is provided in the space. And it is preferable to inject the water blocking material into the space of the pipe on the side to be received in the space. As a result, even if the engaging portion moves forward while interrupting the sealing material of the installed pipe, the water blocking material enters into a slight gap between the engaging portion and the sealing material, so that the water blocking performance becomes higher. .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a column or pipe 10 includes a cylindrical main body 12 having a substantially circular cross-sectional shape. The main body 12 has a pair of edges 1 forming a continuous gap 14 from one end to the other end in the longitudinal direction.
2a.

A first member or partition member 16 and a second member or engaging member 18 are fixed to the inside and outside of the main body 12 by welding or the like, respectively.
The partitioning member 16 and the engaging member 18 continuously extend from one end to the other end of the main body portion 12 in the longitudinal direction.

In the illustrated example, the partition member 16 is a channel member having a substantially U-shaped cross section, but is substantially C.
It may be a member having another cross-sectional shape such as a letter shape. The partitioning member 16 is continuously and liquid-tightly fixed to the inner side surfaces of both edge portions 12a at both ends in the width direction by welding or the like over the entire length range. As a result, the partition member 16 forms a space, that is, a space 20 that communicates with the outside of the main body portion 12 through the gap 14 inside the main body portion 12 in cooperation with the main body portion 12, particularly both edge portions 12a. The space 20 is liquid-tightly partitioned by the partitioning member 16 from the rest of the internal space of the main body portion 12, that is, the space 22.

The engaging member 18 is an elongated first plate-shaped member 18.
a and a first edge of the first plate-shaped body in the width direction, and
Second plate-shaped body 1 that is substantially perpendicular to the plate-shaped body 18a of
8b and has a T-shaped cross-sectional shape. Engaging member 18
Is continuously and liquid-tightly fixed to the outer surface of the main body 12 at the other end of the first plate 18a by welding or the like over the entire length range.

The thickness dimension of the first plate-shaped body 18a is the gap 1
It is smaller than the width dimension of 4. The width dimension of the second plate-shaped body 18b is larger than the width dimension of the gap 14 and smaller than the width dimension of the space 20. Therefore, when the force for separating the two pipes 10 acts on the two pipes 10 in a state where the engagement members 18 of the one pipes adjacent to each other are received in the space 20 of the other pipes 10 adjacent to each other, The second plate-shaped body 18b abuts on the inner surface of the edge 12a of the adjacent pipe,
To prevent them from being separated.

As shown in FIG. 2, in the partition member 16, a communication portion for communicating the space 20 and the space 22 through a hole 16a formed in the partition member 16, that is, a communication member 24 is welded to the space 22 side. It is fixed by etc. In the illustrated example, the communication member 24 is closed by a screw lid 26 that is detachably screwed to the communication member 24.

The screw lid 26 is removed when the powdery or slurry water-stopping material containing the solidifying material is injected into the space 20, and instead, an injection means such as a hose or a tube is connected to the communication member 24. . Instead of the screw lid 26, a check valve may be attached to the communication member. As the water blocking material, a water blocking material having solidifying properties such as powdered cement or mortar can be used.

An elongated seal member 28 is arranged in the space 20 over the entire length of the space 20. The seal member 28 is made of a material such as styrofoam, foam rubber, sponge, etc., which has waterproofness and elasticity and can be cut by pressure, compression force, etc., and is slightly compressed and deformed in the space 20. It is accommodated in a state and is in close contact with surrounding members, and further projects into the gap 14 in the illustrated example.

The sealing material 28 is preferably placed in the space 20 before the pipe 10 is actually laid, such as when the pipe is manufactured or when the pipe 10 is laid. However, the sealing material 28 may be arranged in the space 20 while advancing the pipe 10 to the excavation mark for laying.

At the time of laying, the pipe 10 is arranged at the rear end of the shield type tunnel excavator having a cross-sectional area substantially the same as the cross-sectional area of the main body 12 with the sealing material 28 provided in the space 20. Then, while the ground is being excavated by the excavator by the source pushing device arranged in the starting vertical shaft, it is advanced together with the excavator from the starting vertical shaft to the reaching vertical shaft. As a result, the pipe 10 is pushed into the excavation mark by the excavator.

As a shield type tunnel excavator, for example, Japanese Patent Laid-Open No. 61-10299 (Japanese Patent Publication No. 4-5120).
JP-A-63-189596 (Japanese Patent Publication No. 4-6)
9719), JP-A-3-59295, JP-A-5-25998, JP-A-5-26671, etc., as described in JP-A-5-26671, a shield body and a cutter assembly for excavating the ground. A known excavator having a driving mechanism for rotating the cutter assembly, a discharging means for discharging excavated matter, and a direction correcting mechanism for correcting the excavation direction, in particular, a cutter assembly driven by a driving source. Equipped mechanical excavator can be used. However, other excavators may be used.

An example of an extruding device is, for example, an actual press machine 59.
As described in JP-A-80594 (Japanese Utility Model Publication No. 1-37038), JP-A-60-219395, etc., a plurality of hydraulic jacks having a pit wall of a starting shaft as a reaction force body are included. A known device can be used.

Usually, the length of the pipe 10 is shorter than the distance between the starting vertical shaft and the reaching vertical shaft. Therefore, every time when the work of pushing one pipe into the excavation mark by a distance corresponding to the length of the pipe is finished, a new pipe of the same kind is laid at the rear end of the pipe, the main body portions 12 and the partition member 16 are separated from each other.
Work is performed to connect the members and the engaging members 18 to each other in a matched state.

During the laying of the pipe, the pipe seal member 28 during the laying of the pipe prevents fluid such as ground water and muddy water used in an excavator from flowing out through the space 20 of the pipe to the starting shaft. As a result, it is possible to prevent the excavated material or the surrounding earth and sand from flowing out together with the fluid into the starting shaft through the space 20. Therefore, when laying the pipes 10 of the first pipe row, and before the solidifying water blocking material need not be injected into the space 20 in advance.

However, in order to further improve the waterproofness, when the pipe 10 of the first pipe row is laid, the screw lid 26 is removed, and instead the injection means is connected to the communication member 24,
A predetermined amount of the solid water blocking material may be injected from the injection means into the space 20 via the communication member 24, or a predetermined amount of the solid water blocking material may be injected into the space 20 in advance.

When the excavator reaches the vertical shaft for reaching, a new pipe row of a new pipe of the same kind is laid next to the laid pipe row, particularly on either side of the partition member 16 and the engaging member 18. Work is done. When a predetermined number of pipe rows are laid, the work of laying a new pipe row with a new pipe of the same kind is performed on the other side of either the partition member 16 or the engaging member 18 of the pipe row that was initially laid. Be done.

These operations are also performed by the pipe 1 as described above.
After arranging a new pipe of the same type as 0 at the rear end of the shield type excavator, by the original pushing device arranged in the starting shaft,
This is performed by excavating the ground with an excavator and advancing together with the excavator from the starting vertical shaft to the reaching vertical shaft.

Each newly laid pipe is laid in a state in which the engaging portion 18 of the pipe 10 of one adjacent pipe row is received in the gap 14 and the space 20 of the pipe 10 of the other adjacent pipe row. . Thereby, while each pipe to be newly laid is advanced, the edge portion 12a and the partition member 16 of the pipe of one adjacent pipe row and the engagement member 18 of the pipe of the other adjacent pipe row are laid. It acts as a guide that guides the pipe on the way along the installed pipe.

When the pipe of the new pipe row is laid on the side of the partition member 16 of the pipe of the already laid pipe row, the new pipe has the engaging member 18 in the gap 1 between the pipes already laid.
It is pushed into the excavation track by the excavator so as to be received in the space 20 via 4. On the other hand, when the pipe of the new pipe row is laid on the side of the engagement member 18 of the pipe of the laid pipe row, the new pipe has the engagement member 18 of the laid pipe in the space of the new pipe. It is pushed into the excavation track by the excavator so as to be received in 20 via the gap 14.

The pipe which is being laid is provided with an engaging member 18 for the pipe.
So as to cut the seal member 28 of the installed pipe and cut into the seal member 28, or so that the engaging member 18 of the installed pipe cuts into the seal member 28 of the pipe that is being installed and cuts into the seal member 28. Will be moved to. Therefore, the seal member 28 does not hinder the laying of the pipe.

When a new pipe row is laid next to the already installed pipe row, the screw lid 26 of the pipe 10 on the side of the pipe row that receives the engaging portion 18 is removed, and the injection means for the solid water blocking material is removed. Is connected to the communication member 24, and the water blocking material is injected into the space 20 from the injection means via the communication member 24.
When a check valve is provided instead of the screw lid 26, the injection means is connected to the check valve, and the water blocking material is injected from the check valve into the space 20 via the communication member 24.

As a result, the water blocking material causes a slight clearance between the seal material 28 and the surface forming the clearance 14 and the space 20, a slight clearance present in the seal material 28, and the sealing material due to interruption of the engaging member. Since the gap formed by the crack formed in the gap, the gap between the engaging member and the seal material, and the like enter the pipe, the water-stopping material solidifies at that location and liquid-tightly closes the gap, It is possible to prevent the gap 14 and the space 20 from acting as a flow path for a fluid such as groundwater.

During and after laying the pipe, the pipe sealing member 28 prevents the fluid such as ground water and muddy water used in the excavator, especially the liquid, from flowing out to the starting vertical shaft through the space 20 of the pipe. To prevent. As a result, it is possible to prevent the excavated material or the surrounding earth and sand from flowing out together with the fluid into the starting shaft through the space 20.

The above steps are repeated until an underground structure having a predetermined sectional shape formed by a plurality of pipe rows is constructed. By sequentially laying a plurality of pipe rows in this manner, a polygonal shape, a circular shape, a V shape, an L shape,
An underground structure having a U-shaped cross section is constructed.

The pipes in the row of pipes first laid between the starting vertical shaft and the reaching vertical shaft have no engaging member 18 or are spaced around the axis of the main body 12. The pipe is preferably provided with the gap 14, the partition member 16, the space 20, and the seal member 28 at each of the positions.

In the former case, the pipe row to be laid thereafter is laid on the partition member 16 side of the already laid pipe row. In the latter case, the pipe row to be laid afterwards is
It is laid on the side of one partition member 16 of the pipe row initially laid, and then laid on the side of the other partition member 16 of the pipe row initially laid.

When the pipe shown in FIG. 1 is used as the pipe of the pipe row first laid between the start vertical shaft and the reaching vertical shaft, the subsequent pipes are the partition members of the pipe line first laid. 16 may be laid only on the side of 16 or the partition member 16 and the engaging member 1 of the pipe row laid first.
8 may be laid on one side and then laid on the other side of the partition member 16 and the engaging member 18 of the pipe row initially laid.

The main part 12 is used as a pipe of the pipe row first laid between the starting vertical shaft and the reaching vertical shaft.
The pipe may be provided with a pair of engaging members 18 at each of two places spaced around the axis of the above. In this case, the subsequent pipe may be laid only on one side of the engaging member 18 of the first laid pipe row, or on the side of the one laid member 18 of the first laid pipe row. After laying, the other engaging member 18 of the first laid pipe row
May be laid on the side of.

During and after laying the pipe, the sealing member 28 prevents fluid such as groundwater and muddy water used in the excavator, especially liquid from flowing out to the starting shaft through the space 20 of the pipe. As a result, it is possible to prevent the excavated material or the surrounding earth and sand from flowing out together with the fluid into the starting shaft through the space 20.

Instead of providing the sealing member 28 over the entire length of the space 20, the sealing member 28 is replaced by the space 20.
May be provided at a part, particularly at the rear end portion, or may be provided at a plurality of positions in the longitudinal direction of the space 20. However, the seal member 28
Is provided over the entire length of the space 20, it is possible to prevent the fluid from flowing into the space 20 from the gap 14, so that the sealing property is further improved.

The seal member 28 does not have to project into the gap 14. However, when the seal member 28 overhangs the gap 14, it is possible to prevent the gap 14 from acting as a flow path for a fluid such as a liquid, so that the sealing property is further improved. When the sealing member 28 is made of a member having elasticity and is in close contact with the inner surface of the member forming the space 20, the sealing property is further improved.

In the embodiment shown in FIG. 1, the pipe 10 has the first and second members 16 and 18 at a position angularly spaced about 180 degrees around the axis of the main body 12.
For this reason, the pipe 10 is suitable for a pipe roof construction method in which a plurality of pipes are sequentially arranged linearly adjacent to each other in the horizontal direction, the vertical direction, and the like. However, the cross-sectional shape of underground structures using multiple pipes is square, circular, semicircular, U-shaped,
The shape may be any shape such as U-shape, V-shape, inverted U-shape, inverted V-shape, and gate shape.

Therefore, for example, if one or more pipes having an angle between the partitioning member 16 and the engaging member 18 around the axis of the main body 12 other than 180 degrees are used during pipe laying in the pipe roof construction method, It is possible to construct an underground structure that bends into a hook shape, an L shape, an inverted V shape, or the like at a pipe portion.

As is clear from the above, the partitioning member 16 centered on the axis of the main body 12 of the pipe 10 and the engaging member 1 are provided.
The angle with 8 need not be 180 degrees as in the illustrated example, but can be any angle depending on the cross-sectional shape of the underground structure to be constructed.

Instead of using the partition member 16 having a substantially U-shaped cross section, a flat plate-shaped partition member 36 is used like the columnar body, that is, the pipe 30 shown in FIG. And the partition member 36 may be jointly formed. The partition member 36 is continuously and liquid-tightly fixed to the inner surface of the main body 32 at both widthwise edges thereof by welding or the like over the entire length range.
The space 20 communicating with the outside through the gap 14 between both edge portions 32a of the main body portion 32 is formed in cooperation with the main body portion 32. The sealing material 28 is arranged in the gap 14 and the space 20.

Instead of using the engaging member 18 having a T-shaped cross-sectional shape, an engaging member 38 having an L-shaped sectional shape may be used as in the pipe 30 shown in FIG. Each of the engagement members 38 is continuous with the elongated first plate-shaped body 38a at one end edge in the width direction and one edge in the width direction of the first plate-shaped body 38a, and is substantially perpendicular to the first plate-shaped body 38a. And an elongated second plate-like body 38b. Both engagement members 38 are welded to the outer surface of the main body 12 at the other end edge of the first plate-shaped body 38a in the width direction so that the second plate-shaped body 38b projects in the opposite direction. It is fixed in a liquid-tight manner continuously over the range.

The present invention can be applied not only to a pipe having a circular cross section and a pipe roof construction method using the pipe, but also to a pipe having a polygon cross section and a pipe roof construction method using the pipe. Further, the present invention can be applied not only to steel pipes and pipe roof construction methods using the same, but also to reinforced concrete pipes, steel and concrete pipes, steel and reinforced concrete pipes, and pipe roof construction methods using the same. .

The columnar body or pipe 40 shown in FIG.
It includes a quadrangular tubular main body 42 having an outer shape including four surface portions corresponding to the respective sides of the quadrangle. The main body portion 42 has a pair of edge portions 42a that form the gap 14 continuous from one end to the other end in the longitudinal direction in one surface portion.

A partition member 46 and an engaging member 48 extending in the longitudinal direction of the main body 42 are liquid-tightly fixed to the inside and the outside of the main body 42 by welding or the like over the entire length range. The sealing material 28 is arranged in the gap 14 formed by both edges 42 a of the main body 42 and the space 20 formed by the main body 42 and the partition member 46.

The partition member 46 is an elongated flat plate member and is fixed to the inner surface of the main body at both ends in the width direction. Similar to the engaging member 18, the engaging member 48 has a T-shaped cross-sectional shape by the first and second plate-shaped bodies 48a and 48b, and the main body portion of the first plate-shaped body 48a. It is fixed to the outer surface of 42.

As an excavator used for a square pipe, for example, Japanese Patent Laid-Open Nos. 4-237796 and 4-35.
A shield type excavator described in Japanese Patent No. 7298, etc.
A shield body such as a shield type excavator proposed in Japanese Patent Application No. 4-293948, a cutter assembly for excavating the ground, a drive mechanism for rotating the cutter assembly,
An excavator equipped with a direction correcting mechanism for correcting the excavation direction can be used.

If the partitioning member and the engaging member are fixed in a liquid-tight manner over the entire length of the main body as in each of the above-described embodiments, groundwater and the like will not be discharged when the pipes are laid underground. This is preferable because it can prevent passage between adjacent pipes.

However, depending on the ground, it may not be necessary to use a pipe in which the partitioning member and the engaging member are fixed in a liquid-tight manner over the entire length of the main body. In such a case, the partition member and the engagement member may be fixed to the main body at a plurality of locations in the longitudinal direction, respectively.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a pipe of the present invention.

FIG. 2 is an enlarged view showing an embodiment of a partition member and an engaging member of the pipe of FIG.

FIG. 3 is a cross-sectional view showing a second embodiment of the pipe of the present invention.

FIG. 4 is a cross-sectional view showing a third embodiment of the pipe of the present invention.

[Explanation of symbols]

 10, 30, 40 Pipe 12, 32, 42 Main part 14 Gap 16, 36, 46 Partitioning member (partitioning part) 18, 38, 48 Engaging member (engaging part) 20 Space 24 Communication member (communication part) 26 Screw Lid 28 Seal material 12a, 32a, 42a Edge portion 18a, 38a, 48a First plate-shaped portion 18b, 38b, 48b Second plate-shaped portion

Claims (5)

[Claims] 1. A tubular main body having a pair of edges forming a continuous gap from one end to the other in the longitudinal direction, and a main body fixed to the inside of the main body from one end in the longitudinal direction. A partition part that continuously extends to the other end and that forms a space, which is communicated to the outside of the main body part through the gap, inside the main body part in cooperation with both edge parts of the main body part. ,
An engaging portion that is fixed to the outside of the main body portion and extends in the longitudinal direction of the main body portion, and is received in the gap and the space of the same type of pipes that are arranged next to each other and the edge portion of the adjacent pipe. A pipe that includes an engaging portion that can be engaged and a communication portion that is fixed to the partition portion and that communicates the inside of the main body portion with the space. 2. The pipe according to claim 1, further comprising at least a sealing material arranged in the space. 3. An elongate first plate-like body, wherein:
An elongated second plate that follows one end of the first plate in the width direction and is substantially perpendicular to the first plate has a T value.
3. The pipe according to claim 1, wherein the pipe has a letter-shaped or L-shaped cross-sectional shape, and is fixed to an outer surface of the main body at the other end edge of the first plate-shaped body. 4. 4. A pipe roof construction method using a plurality of pipes according to claim 1, wherein the pipe in which a sealing material is arranged in the space is excavated while the ground is excavated by a shield tunnel excavator. The engaging portion of the pipe is placed in the excavation mark by the excavator in a state of being received in the gap and the space of the other adjacent pipe, and at the same time as or after this, a stop in a powder or slurry state including solidification. A pipe roof construction method comprising injecting a water material into the space from the communicating portion of a pipe which is being laid or has been laid. 5. A pipe in which a sealing material is filled in the space is placed in the excavation mark in a state where the engaging portion is received in the gap and the space of a pipe already laid next to the engaging portion. The pipe roof construction method according to claim 4, wherein the water blocking material is injected into the space of the pipe on the side to be received in the gap and the space.