JP7424916B2 - Joint parts for pipes buried in precast concrete walls and how to use them - Google Patents

Description

The present invention relates to a joint member for a pipe buried in a precast concrete wall that connects a pipe buried inside a precast concrete wall, and a method for using the same.

BACKGROUND ART Conventionally, it has been known to bury communication pipes and the like for storing cables inside concrete wall railings on expressways and the like.

For example, as in Patent Document 1, a buried structure is known, which is a transport pipe buried in concrete, which can be suitably used as a transport pipe for utilities such as water supply for ships, which is buried in a quay in a port facility. ing. In this buried structure, a transport pipe joint is located at a concrete expansion joint, an expansion pipe is interposed in this transport pipe joint, and an outer pipe that covers this expansion pipe is placed on one transport pipe side. A sliding tube that fits around the outer diameter and is slidable in the axial direction of the outer tube is disposed on the other transport pipe side, and the transport pipe is buried in concrete.

In addition, as in Patent Document 2, when laying power and communication lines such as power cables, telephone lines, CATV cables, and wired broadcasting cables while protecting them with cable protection pipes, it is necessary to install cables such as bridges and highway viaducts. It is known in the art to connect cable protection tubes using pipe joints of a specific shape. The connection structure of this cable protection tube consists of a bellows tube having cable protection tube sockets at both ends, and a cover member that is fixed to the cable protection tube and protects the outer periphery of the bellows tube. a pair of left and right cylindrical members that face each other at a predetermined distance around the center and outer periphery of the bellows tube, and whose other ends engage with the cable protection tube, and a connecting member located on the tip side of each cylindrical member; The parts other than the attachment part are buried in the railing, and the opposing cylindrical members are integrally connected with a flexible connecting member.

In addition, as in Patent Document 3, other precast walls that are connected to the side ends of the deck in the direction perpendicular to the bridge axis and parallel to the bridge surface through the ground cover, and that are adjacent in the bridge axis direction. Precast wall balustrades that are joined to balustrades are known. This precast wall parapet member is placed above the ground covering, and a joint material such as non-shrinkage mortar is placed between the two concrete parts. The precast wall parapet member is moved by a crane or the like to a position above the position where it should be placed, and the first longitudinal anchoring bar and the second longitudinal anchoring bar are received in the receiving hole, and the adjacent precast wall balustrade member that has been installed in the receiving groove is moved. The precast wall balustrade is lowered and placed in position so that the lateral anchorage of the balustrade is received.

Japanese Unexamined Patent Publication No. 62-147192 Patent No. 3834769 Japanese Patent Application Publication No. 2018-141341

However, if it is not possible to maintain a large distance between the ends of the buried pipes in a pair of adjacent precast concrete walls, there is a problem in that it is difficult to connect the joint members that connect them.

The present invention has been made in view of the above, and an object of the present invention is to easily solve the problem even when the distance between the buried pipe ends of a pair of adjacent precast concrete walls is limited. The purpose is to enable connections between buried pipes.

In order to achieve the above object, in this invention, a core and a biasing member are housed in a pair of buried pipe connection parts and brought between a pair of end parts, and The ends are now connected using buried pipe connections.

Specifically, the first invention is a joint member for a precast concrete wall buried pipe that connects buried pipes buried inside a pair of precast concrete walls,
a first buried pipe connecting portion in which a first end of a first buried pipe buried in one first precast concrete wall is connected to the base end;
a second buried pipe connecting portion where the second end of the second buried pipe buried in the other second precast concrete wall is connected to the base end;
a first enlarged diameter end portion formed on the side surface side of the second precast concrete wall on the tip side of the first buried pipe connection portion;
a second enlarged diameter end portion formed on the side surface side of the first precast concrete wall on the tip side of the second buried pipe connection portion;
a cylindrical core having both ends connected to the first enlarged diameter end and the second enlarged diameter end;
a cylindrical urging member that can be entirely housed in at least one of the first expanded diameter end and the second expanded diameter end;
In a state where the core pushes the biasing member and the end portion is accommodated in at least one of the first enlarged diameter end portion and the second enlarged diameter end portion, the first end portion and the second end portion The proximal end portions of the first buried pipe connecting portion and the second buried pipe connecting portion can be inserted between the first end portion and the second buried pipe connecting portion, respectively, while being pushed back by the biasing member. It is configured to be connectable to the second end.

According to the above configuration, even if the distance between the buried pipe ends of a pair of precast concrete walls is short, the core and biasing member are installed inside the pair of enlarged diameter ends, and the distance between the base ends is When shortened, it can be placed between a pair of ends. Then, when the hand is released, the pair of enlarged diameter end portions expands due to the urging force of the urging member, so that each proximal end portion is connected to the corresponding end portion. This reliably connects the pair of buried pipes. In addition, since the biasing member is accommodated in at least one of the first base end portion and the second base end portion, it may be provided on either one or both.

In the second invention, in the first invention,
A water-swellable nonwoven fabric that expands when it contains water is wrapped around the outer periphery of both ends of the core.

According to the above structure, the water-swellable nonwoven fabric swells due to the moisture contained in the mortar, etc., which is the filler, so that a seal can be ensured between the core and the pair of enlarged diameter ends, and the filler is It does not flow into the second buried pipe.

In the third invention, in the first or second invention,
The first buried pipe connecting portion and the second buried pipe connecting portion have the same shape, and are configured to have the biasing member installed therein so as to be able to bias both ends of the core.

According to the above configuration, since the first and second buried pipe connecting portions have the same shape, it is easy to manage and attach the parts. In addition, by installing biasing members on both sides, the core is evenly pushed from both sides, and the first buried pipe and the second buried pipe can be connected in a stable state.

In the fourth invention, in the first or second invention,
The first buried pipe connection part is longer than the second buried pipe connection part, and the biasing member is configured to be able to be installed internally,
The second buried pipe connecting portion is configured to accommodate one end of the core urged by the urging member.

According to the above configuration, the first buried pipe connection part is longer in order to accommodate the biasing member and one end of the core, and the second buried pipe connection part is shorter. For example, the longer first buried pipe connecting part is connected to the first end, the second buried pipe connecting part is inserted into the other end of the core, and the biasing member is pushed into the first buried pipe connecting part. It is inserted between the end portion and the second end portion, and is connected to the second end portion with the pushed back second buried pipe connection portion.

In a fifth invention, a joint member for a pipe buried in a precast concrete wall according to the first or second invention;
preparing a first precast concrete wall in which the first buried pipe is buried and a second precast concrete wall in which the second buried pipe is buried;
Arranging the first precast concrete wall and the second precast concrete wall so that the first end and the second end are in opposing positions,
The urging member is pushed into the core so that at least one end thereof is accommodated in the first enlarged diameter end and the second enlarged diameter end. Insert between
The proximal end portions of the first buried pipe connecting portion and the second buried pipe connecting portion are connected to the first end portion and the second end portion, respectively, in a state where they are pushed back by the biasing member. .

According to the above configuration, even if the distance between the buried pipe ends of a pair of precast concrete walls is short and it is difficult to insert a core, the core and biasing member can be installed inside the pair of enlarged diameter ends. By reducing the distance between the proximal ends, it can be placed between a pair of end parts. Then, when the hand is released, the pair of enlarged-diameter end portions expands due to the urging force of the urging member, so that the respective proximal ends are connected to the respective end portions. Thereby, the pair of buried pipes are reliably connected by the core which is prevented from coming off by the biasing member.

In a sixth invention, a joint member for a precast concrete wall buried pipe according to the first or second invention;
preparing a first precast concrete wall in which the first buried pipe is buried and a second precast concrete wall in which the second buried pipe is buried;
Arranging the first precast concrete wall and the second precast concrete wall so that the first end and the second end are in opposing positions,
The core is housed in the first enlarged diameter end of the first buried pipe connecting part connected to the first end with the urging member pressed therein, and is held down by the second buried pipe connecting part, and the core is held down by the second buried pipe connecting part, inserted between the first end and the second end;
The base end portion of the second buried pipe connecting portion pushed back by the biasing member is connected to the second end portion.

According to the above configuration, even if the distance between the buried pipe ends of a pair of precast concrete walls is short, the core and the biasing member are installed in the first enlarged diameter end and the second buried pipe connection part is If the distance between the proximal ends is shortened, the base end can be placed between the pair of ends. Then, when the hand is released, the second enlarged diameter end side is pushed by the urging force of the urging member, so that the proximal end thereof is connected to the second end. Thereby, the pair of buried pipes are reliably connected by the core which is prevented from coming off by the biasing member.

As explained above, according to the present invention, the distance between the proximal ends of a pair of buried pipe connections can be adjusted using the biasing member, so that the distance between the buried pipes of a pair of adjacent precast concrete walls can be adjusted. Buried pipes can be easily connected even in a narrow range, such as when the distance between end parts is limited.

It is an exploded sectional view showing a core insertion process of a precast concrete wall concerning Embodiment 1 of the present invention. It is a sectional view showing a core attachment process of a precast concrete wall concerning Embodiment 1 of the present invention. 1 is a sectional view showing a joint structure including a joint member for a precast concrete wall-embedded pipe according to Embodiment 1 of the present invention. 1 shows a precast concrete wall according to Embodiment 1 of the present invention, in which (a) shows a side surface on the first end side, and (b) shows a side surface on the second end side. FIG. 2 is a sectional view corresponding to FIG. 2 according to Embodiment 2 of the present invention.

Embodiments of the present invention will be described below based on the drawings.

(Embodiment 1)
-Composition of joint structure-
FIG. 3 shows a joint structure 1 including a joint member 30 for a precast concrete wall buried pipe that connects buried pipes 4 and 4' buried inside a pair of precast concrete walls 2 and 2'. As shown in Fig. 3, the precast concrete walls 2, 2' and the buried pipes 4, 4' have basically the same shape as a whole, but as shown in Fig. 1, we focused on one joint surface. The name has been changed to make it easier to understand. The joint member 30 for a precast concrete wall buried pipe in this embodiment includes a first buried pipe connection part 10, a second buried pipe connection part 20, a core 6, and a compression coil spring 7, which will be described later.

For example, as shown in FIG. 4, the precast concrete walls 2, 2' have a height of about 900 mm, a width (thickness) of about 250 to 450 mm, and a length of 2 to 3 m. As will be described in detail later, a large number of precast concrete walls 2, 2' are manufactured with the first and second buried pipes 4, 4', etc. buried in these precast concrete walls 2, 2', and the construction is carried out on site. A large number of precast concrete walls 2, 2' are connected using a crane or the like.

As shown enlarged in FIGS. 1 and 2, this joint member 30 connects a straight pipe-shaped first pipe to a first end 5 of a first buried pipe 4 buried inside one first precast concrete wall 2. The cylindrical first buried pipe connection part 10 to which the base end part 11 is connected and the second end part 5' of the second buried pipe 4' buried inside the other second precast concrete wall 2' are connected directly to each other. It includes a cylindrical second buried pipe connecting portion 20 to which a tubular second base end portion 21 is connected. The first and second buried pipes 4, 4' are made of, for example, a general-purpose hard vinyl chloride electric conduit. In this embodiment, first and second buried pipes 4 and 4' buried inside a handrail of a highway or the like are targeted. Further, the first buried pipe connecting portion 10 and the second buried pipe connecting portion 20 are made of, for example, hard vinyl chloride, each having a first expanded diameter end portion 12 and a second expanded diameter end portion 22 whose distal end side is expanded in diameter. Consists of resin molded products. In this embodiment, a socket 13 having an inner diameter larger than the outer diameter of the first end 5, the second end 5', the first base end 11, and the second base end 21 is embedded, and The first base end 11 or the second base end 21 is bonded to the socket 13 connected to the first end 5 or the second end 5' using an adhesive or the like, respectively. Note that the inner diameters of the first base end portion 11 and the second base end portion 21 are made slightly larger than the outside diameters of the buried pipes 4 and 4', so that the first base end portion 11 and the second base end portion 21 are fitted with buried pipes. 4 and 4' may be inserted respectively.

As shown in FIG. 1, the joint member 30 includes a core 6 whose at least both ends can be accommodated inside the first buried pipe connecting part 10 and the second buried pipe connecting part 20. The core 6 is made of, for example, a cylindrical resin molded product. The length of the core 6 is set so that the core 6 does not slip out while both ends are accommodated in the first enlarged diameter end 12 and the second enlarged diameter end 22. For example, both ends of the core 6 may be chamfered. Providing the chamfer allows smooth insertion into the first enlarged diameter end 12 and the second enlarged diameter end 22. A water-swellable nonwoven fabric 8 that expands when it contains water is wrapped around the outer periphery of both ends of the core 6. Therefore, when filling the mortar 3 as a filler, the moisture in the mortar 3 swells the water-swellable nonwoven fabric 8 to ensure a secure seal, and the mortar 3 flows into the first and second buried pipes 4 and 4'. There is no such thing. The water-swellable nonwoven fabric 8 may be a sealing member that does not have a water-swelling function and simply has watertightness.

As shown in FIGS. 2 and 3, for example, the longitudinal center portion of the core 6 is recessed, so when pouring the mortar 3, the mortar 3 also flows into this recess and the core 6 is firmly fixed. . For this reason, the core 6 does not move during the subsequent wiring work for cables, etc. On the other hand, when wiring work such as a cable is performed before filling the mortar 3, a retaining ring or the like may be attached to this recessed portion to prevent the core 6 from moving. This recess does not necessarily have to be provided. On the other hand, chamfers may be provided on the inner surfaces of both ends of the core 6. In this case, the wires are less likely to be caught on the core 6 during wiring work, and can be inserted smoothly.

The joint member 30 also includes a pair of compression coil springs 7 as cylindrical biasing members that can be entirely housed inside the first and second enlarged diameter end portions 12 and 22 on the back side of the core 6. There is. The compression coil spring 7 is made of spring stainless steel wire, for example. The compression coil spring 7 may be constructed of a spring steel wire coated with anti-rust coating. As shown in FIG. 2, this compression coil spring 7 is sized to fit inside the first and second enlarged diameter ends 12, 22 together with the core 6 in a compressed state, so that cables etc. will not get caught after being buried. It is desirable to have such a smooth inner peripheral surface. In order for the compression coil spring 7 to perform its functions, its outer diameter is slightly smaller than the inner diameters of the first and second enlarged diameter ends 12 and 22 and larger than the inner diameter of the core 6.

In this embodiment, the first buried pipe connecting part 10 and the second buried pipe connecting part 20 have the same shape, and are configured to have compression coil springs 7 installed therein so as to be able to bias both ends of the core 6. However, only one compression coil spring 7 may be provided instead of a pair. In that case, the first buried pipe connecting portion 10 and the second buried pipe connecting portion 20 may have different shapes.

Note that a cylindrical cover with a smooth inner surface may be provided inside the compression coil spring 7. Alternatively, the compression coil spring 7 may be wrapped in a cylindrical vinyl or film so that it can expand and contract together with the compression coil spring 7. In either case, the electric wire or the like becomes less likely to be caught on the inner circumferential surface of the compression coil spring 7 during wiring work.

Note that sealing members may also be provided on the outer peripheries of the first and second base end portions 11 and 21 of the first and second buried pipe connection portions 10 and 20. This eliminates the need for waterproofing with tape or the like after fitting the joint member 30. Note that when the first and second base end portions 11 and 21 are fitted into the outer peripheries of the first and second end portions 5 and 5', the sealing member is attached to the outer periphery of the first and second base end portions 11 and 21. It is best to provide it on the inner periphery. The sealing member may be a water-swellable nonwoven fabric or may be any other watertight seal. In this way, by providing a sealing member not only between the core 6 but also between the corresponding ends 5 and 5', it is possible to reliably prevent the filler from flowing in.

As shown in FIG. 3, in the joint structure 1 having the joint member 30 for the precast concrete wall buried pipe of this embodiment, the first enlarged diameter end of the first buried pipe connecting portion 10 connected to the first buried pipe 4 The section 12 opens at the joint between the side surface and the opposing side surface of the second precast concrete wall 2', and the core 6 is biased from both sides by the compression coil spring 7 to maintain the first buried pipe connection section 10 in a stable state. and the second buried pipe connecting portion 20, and the filler is provided between the joint portion and the outer circumferential surface of the core 6 and the inner circumferential surfaces of the first and second enlarged diameter ends 12, 22. is filled with mortar 3.

In this way, in the joint member 30 of this embodiment, as shown in FIG. In this state, the first buried pipe connection part 10 and the second buried pipe connection part 10 can be inserted between the first end part 5 and the second end part 5', and are pushed back by the compression coil spring 7, as shown in FIG. The base ends 11 and 21 of the two buried pipe connection parts 20 are configured to be connectable to the first end 5 and the second end 5', respectively.

-How to use the joint structure-
Next, a method of using the joint member 30 for a pipe buried in a precast concrete wall will be explained.

In the preparation step, the first and second buried pipes 4, 4', the first and second buried pipe connecting parts 10, 20, the core 6, etc. described above are prepared.

First, in a formwork assembly process, a formwork made of wood or the like is placed, for example, in a factory.

Next, in a reinforcing bar assembly process, rod-shaped and annular reinforcing bars 51 are arranged within the formwork.

Next, as shown in FIG. 4, in the buried pipe installation process, the first buried pipe 4 with the socket 13 connected to the first end 5 is inserted into the formwork of the first precast concrete wall 2, and the socket 13 is inserted into the second A second buried pipe 4' connected to the end 5' is respectively arranged within the second precast concrete wall 2'.

Then, in the concrete pouring process, concrete is poured into the formwork.

Next, in a formwork release step, the formwork is released and the first and second precast concrete walls 2, 2' are completed.

A large number of these precast concrete walls 2, 2' are manufactured and transported to a construction site such as an expressway.

Then, at the construction site, in the placement process, the first and second precast concrete walls 2, 2 are placed with a gap between them using a crane or the like. At this time, as shown in FIG. 1, the first end 5 and the second end 5' are arranged at opposing positions, and a gap of distance L1 is maintained between the sockets 13. The gap between the side surfaces of the pair of precast concrete walls 2, 2' becomes a joint 3.

Next, as shown in FIG. 1, in the core insertion process, after inserting the compression coil springs 7 into the first enlarged diameter end 12 and the second enlarged diameter end 22, the first enlarged diameter end 12 and the second enlarged diameter end 22 are inserted. 2. The core 6 is inserted and held at the enlarged diameter end 22 while pressing the pair of compression coil springs 7. At this time, since the outer peripheral end of the core 6 is chamfered, it can be easily inserted into the first enlarged diameter end 12 and the second enlarged diameter end 22. In this state, the distance between the first and second base end portions 11 and 21 is set to L2 (however, L2<L1). The first and second buried pipe connections 10, 20 in the reduced state are arranged in a straight line between the first and second ends 5, 5'.

Next, as shown in FIG. 2, in the core installation process, the first and second base end portions 11 and 21 are fitted into the socket 13, respectively, while loosening both hands that are pressing the pair of compression coil springs 7. . The socket 13 may be bonded using an adhesive or the like. At this time, the space between the first and second enlarged diameter end portions 12 and 22 is biased by the compression coil spring 7 and expands to become L3 (L2<L1<L3).

Then, the first enlarged diameter end 12 and the second enlarged diameter end 22 are reliably connected by the core 6 urged by the compression coil spring 7 from both sides. As a result, the buried pipes 4, 4' are connected to each other in a sealed manner.

After confirming that the compression coil spring 7 is biased and the core 6 is securely connected, as shown in FIG. 3, in the mortar filling process, the Fill the joint with mortar 3. At this time, since a water-swellable non-woven fabric 8 that expands when it contains water is wrapped around the outer periphery of both ends of the core 6, the water-swellable non-woven fabric 8 swells with the moisture in the mortar, and the outer periphery of the core 6 and the It is possible to reliably seal between the inner periphery of the first enlarged diameter end 12 and the second enlarged diameter end 22. Further, if the outer periphery of the first and second base end portions 11, 21 and the inner periphery of the first and second end portions 5, 5' are also sealed with a sealing member, the mortar 3 It becomes even more difficult to flow into the second buried pipes 4, 4'.

Next, after the filler 3 dries, electric wires and the like are wired inside the buried pipes 4, 4'. After the first and second precast concrete walls 2, 2 are connected, the compression coil spring 7 and the core 6 remain, but since they are cylindrical, cables etc. are connected to the first and second buried pipes 4, 4'. Does not get in the way when inserted. Note that what is inserted into the buried pipes 4, 4' is not limited to electric wires or the like.

In this embodiment, since the first and second buried pipe connecting portions 20 have the same shape, it is easy to manage and attach the parts. Furthermore, by incorporating compression coil springs 7 on both sides, the core 6 is stabilized in a state where it is evenly pressed from both sides.

Therefore, according to the joint member 30 according to the present embodiment, since the distance between the proximal end portions 11 and 21 of the pair of buried pipe connecting portions 10 and 20 can be adjusted using the compression coil spring 7, the distance between the adjacent Even if the distance between the ends 5, 5' of the buried pipes 4, 4' of the precast concrete walls 2, 2' is short, the buried pipes 4, 4' can be easily connected to each other.

(Embodiment 2)
-Composition of joint structure-
FIG. 5 shows a second embodiment of the present invention, which differs from the first embodiment mainly in the shape of the first buried pipe connection section 110. In this embodiment, the same parts as in FIGS. 1 to 4 are given the same reference numerals, and detailed explanation thereof will be omitted.

In the joint member 130 of this embodiment, as shown in FIG. The length of is getting longer. The compression coil spring 7 and one end of the core 6 are configured to be able to be installed inside this elongated first enlarged diameter end portion 112 .

The first base end portion 11 of the first buried pipe connection portion 110 is connected to the first end portion 5 at the socket 13 portion with an adhesive or the like.

The second buried pipe connecting portion 20 is configured to be able to accommodate the other end of the core 6 that is biased by the compression coil spring 7 .

-How to use joint parts-
Next, a method of using the joint member 130 according to this embodiment will be explained.

First, a first precast concrete wall 2 in which a first buried pipe 4 is buried and a second precast concrete wall 2' in which a second buried pipe 4' is buried are prepared.

Next, the proximal end 11 of the first buried pipe connecting portion 110 is connected to the socket 13 of the first end 5 using an adhesive or the like.

Next, the first precast concrete wall 2 and the second precast concrete wall 2' are arranged so that the first end 5 and the second end 5' are in opposing positions.

Next, the core 6 is held in the first enlarged diameter end 112 of the first buried pipe connecting part 110 connected to the first end 5 by pushing the compression coil spring 7 therein, and is held down by the second buried pipe connecting part 20. , inserted between the first end 5 and the second end 5'.

Next, as shown in FIG. 5, the base end 21 of the second buried pipe connecting portion 20 pushed back by the compression coil spring 7 is connected to the second end 5' with an adhesive or the like.

In this embodiment as well, if the core 6 and the compression coil spring 7 are installed inside the first enlarged diameter end 112 to shorten the distance between the proximal ends 11 and 21, the inner core 6 and the compression coil spring 7 can be arranged between the pair of end parts 5 and 5'. be able to. Then, when the hand is released, the second enlarged diameter end 22 side is pushed by the biasing force of the compression coil spring 7, so that the second base end 21 is connected to the second end 5'. Thereby, the pair of buried pipes 4, 4' are reliably connected by the core 6 which is prevented from coming off by the compression coil spring 7.

Therefore, also in the joint member 130 according to this embodiment, the buried pipes 4, 4' can be easily connected to each other.

(Other embodiments)
The present invention may have the following configuration for the above embodiment.

That is, in the above embodiment, as shown in FIG. 3, one buried pipe 4, 4' is arranged in one precast concrete wall 2, 2'; Two or more buried pipes 4, 4' may be arranged one above the other.

In the above embodiment, the water-swellable nonwoven fabric 8 is provided on the outer periphery of the core 6, but it may be provided on the inner periphery of the first enlarged diameter end 12 or the second enlarged diameter end 22.

Note that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications, or uses.

1 Joint structure
2 First precast concrete wall
2' Second precast concrete wall
3 Mortar (filler, joint area)
4 First buried pipe
4' Second buried pipe
5 First end
5' Second end
6 Core
7 Compression coil spring (biasing member)
8 Water-swellable nonwoven fabric
10 First buried pipe connection section
11 First base end part
12 First enlarged diameter end
13 socket
20 Second buried pipe connection part
21 Second base end part
22 Second enlarged diameter end
30 Joint member
51 Rebar
110 First buried pipe connection section
112 First enlarged diameter end
130 Joint member

Claims (6)

A joint member for a precast concrete wall buried pipe that connects buried pipes buried inside a pair of precast concrete walls,
a first buried pipe connecting portion in which a first end of a first buried pipe buried in one first precast concrete wall is connected to the base end;
a second buried pipe connecting portion where the second end of the second buried pipe buried in the other second precast concrete wall is connected to the base end;
a first enlarged diameter end portion formed on the side surface side of the second precast concrete wall on the tip side of the first buried pipe connection portion;
a second enlarged diameter end portion formed on the side surface side of the first precast concrete wall on the tip side of the second buried pipe connection portion;
a cylindrical core having both ends connected to the first enlarged diameter end and the second enlarged diameter end;
a cylindrical urging member that can be entirely accommodated in at least one of the first enlarged diameter end and the second enlarged diameter end;
In a state where the core pushes the biasing member and the end portion is accommodated in at least one of the first enlarged diameter end portion and the second enlarged diameter end portion, the first end portion and the second end portion The proximal end portions of the first buried pipe connecting portion and the second buried pipe connecting portion can be inserted between the first end portion and the second buried pipe connecting portion, respectively, while being pushed back by the biasing member. A joint member for a pipe buried in a precast concrete wall, characterized in that it is configured to be connectable to a second end. A joint member for a precast concrete wall buried pipe according to claim 1,
A joint member for a pipe buried in a precast concrete wall, characterized in that the outer periphery of both ends of the core is wrapped with a water-swellable nonwoven fabric that expands when it contains water. A joint member for a precast concrete wall buried pipe according to claim 1 or 2,
The first buried pipe connecting portion and the second buried pipe connecting portion have the same shape, and are configured such that the biasing member is installed inside each of them so that both ends of the core can be biased. Joint parts for pipes buried in precast concrete walls. A joint member for a precast concrete wall buried pipe according to claim 1 or 2,
The first buried pipe connection part is longer than the second buried pipe connection part, and the biasing member is configured to be able to be installed internally,
A joint member for a precast concrete wall buried pipe, wherein the second buried pipe connecting portion is configured to accommodate one end of the core urged by the urging member. A joint member for a precast concrete wall buried pipe according to claim 1 or 2,
preparing a first precast concrete wall in which the first buried pipe is buried and a second precast concrete wall in which the second buried pipe is buried;
Arranging the first precast concrete wall and the second precast concrete wall so that the first end and the second end are in opposing positions,
When the core is pushed into the biasing member so that the end portion is accommodated in at least one of the first enlarged diameter end portion and the second enlarged diameter end portion, the first end portion and the second end portion are Insert between
The proximal end portions of the first buried pipe connecting portion and the second buried pipe connecting portion are connected to the first end portion and the second end portion, respectively, while being pushed back by the biasing member. How to use joint parts for pipes buried in precast concrete walls. A joint member for a precast concrete wall buried pipe according to claim 1 or 2,
preparing a first precast concrete wall in which the first buried pipe is buried and a second precast concrete wall in which the second buried pipe is buried;
Arranging the first precast concrete wall and the second precast concrete wall so that the first end and the second end are in opposing positions,
The core is housed in the first enlarged diameter end of the first buried pipe connecting part connected to the first end with the urging member pressed therein, and is held down by the second buried pipe connecting part, and the core is held down by the second buried pipe connecting part, inserted between the first end and the second end;
A method of using a joint member for a buried pipe in a precast concrete wall, characterized in that the proximal end of the second buried pipe connection part pushed back by the biasing member is connected to the second end.

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