JP7428618B2 - Relay member for buried pipe in precast concrete wall and installation method for precast concrete wall - Google Patents

Description

The present invention relates to a relay member for a pipe buried in a precast concrete wall that connects a pipe buried inside a precast concrete wall, and a method for installing a precast concrete wall.

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 precast wall parapet member installed in the receiving groove is moved to the upper part of the precast wall balustrade member. 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

In recent years, there has also been a need to reliably connect buried pipes with a simple configuration.

The present invention has been made in view of this point, and its purpose is to prevent the filler filling the joints from flowing into the buried pipe by using a relay member that comes into pressure contact with the buried pipe. The objective is to ensure that buried pipes can be connected to each other while maintaining the reliability.

In order to achieve the above object, the present invention allows the relay member to be temporarily housed in one of the enlarged diameter opening ends.

Specifically, the first invention is a relay member for a precast concrete wall buried pipe that connects buried pipes buried inside a pair of precast concrete walls at a joint part,
A water-expandable sealing material that expands while in contact with the inner or outer circumferential surface of the buried pipe is provided on the outer or inner circumferential surface of both ends of the cylindrical body.

According to the above configuration, when the joint part is filled with a filler such as mortar, the water-expandable sealing material swells due to the water contained in the filler, so that the outer peripheral surface of both ends of the cylindrical body of the relay part swells. , it is possible to reliably seal between the inner circumferential surface of the buried pipe or between the inner circumferential surface of both ends of the cylindrical body of the relay part and the outer circumferential surface of the buried pipe, and the filler is sealed between the first and second buried pipes. It doesn't flow inside. The water-swellable sealing material may be provided on the inner circumferential surface of the cylindrical main body, or may be provided on the outer circumferential surface of the cylindrical main body.

A second invention is a relay member for a precast concrete wall buried pipe that connects buried pipes buried inside a pair of precast concrete walls at a joint part,
The cylindrical body is configured to be in pressure contact with the inner circumferential surface or the outer circumferential surface of the buried pipe on the outer circumferential surface or inner circumferential surface of both ends of the cylindrical body,
The length of the cylindrical body is within the range in which the cylindrical body can move along the longitudinal direction within the joint area, and the outer circumferential surface or inner circumferential surface of the cylindrical body is embedded in the pair of precast concrete walls. It is set so as to come into pressure contact with both inner circumferential surfaces or outer circumferential surfaces of the pipe.

According to the above configuration, even if the relay member moves in the axial direction when a pair of precast concrete walls are lined up and a gap is secured at the joint, the outer peripheral surface or the inner peripheral surface of the cylindrical body of the relay member will Since the relay member is maintained in pressure contact with the inner or outer circumferential surface of both buried pipes, the relay member will not come off, and even when filling the joint with filler, the filler will not leak inside the buried pipe. does not flow into

In a third invention, there is provided a relay member for a buried pipe in a precast concrete wall that connects buried pipes buried inside a pair of precast concrete walls at a joint part,
The outer circumferential surface or inner circumferential surface of both ends of the cylindrical main body is configured to come into pressure contact with the inner circumferential surface or outer circumferential surface of the buried pipe,
The longitudinally intermediate portion of the cylindrical body is recessed or protrudes from both end portions.

According to the above configuration, since the longitudinal center portion of the relay member is recessed, when pouring the filler, the filler also flows into this recess, and the relay member is firmly fixed. Alternatively, since the longitudinal center portion of the relay member protrudes, the effect of positioning the relay member is exhibited, and the relay member is reliably fixed. For this reason, the relay member does not move during subsequent wiring work such as cables. On the other hand, when wiring work such as a cable is carried out before filling with the filler, a retaining ring can be attached to this recess to prevent the relay member from moving. In addition, since the outer circumferential surface or inner circumferential surface of the cylindrical body of the relay member comes into pressure contact with the inner circumferential surface or outer circumferential surface of the buried pipe, the filler may flow into the buried pipe when filling the joint. do not have.

In the precast concrete wall installation method of the fourth invention, the first enlarged diameter opening end of the first buried pipe opens at the side surface opposite to the side surface of the second precast concrete wall, and the second enlarged diameter opening end of the second buried pipe First and second precast concrete walls in which the first and second buried pipes are respectively buried so that the diameter opening end opens on the side surface opposite to the side surface of the first precast concrete wall, and the outer periphery of both ends of the cylindrical main body. preparing a relay member for a precast concrete wall buried pipe whose surface or inner circumferential surface is in pressure contact with the inner circumferential surface or outer circumferential surface of the first and second buried pipes;
Inserting the relay member until it abuts on the back side of the first enlarged diameter opening end,
With the relay member inserted into the back side of the first diameter-expanding opening end, the tip of the relay member protruding from the first diameter-expanding opening end of the second precast concrete wall is connected to the second diameter-expanding opening end. The first precast concrete wall and the second precast concrete wall are moved horizontally so that the relay member is inserted into the open end, and the outer peripheral surface or the inner peripheral surface of the relay member is in pressure contact with the first buried pipe and the second buried pipe. The construction will ensure a gap between the precast concrete wall and the joint area.

According to the above configuration, when manufacturing the first and second precast concrete walls, the first and second enlarged diameter opening ends are buried, and the relay member is placed on the side of the first enlarged diameter opening end. With the second precast concrete wall inserted until it contacts the inner surface on the back side of the expanded diameter opening end, move the second precast concrete wall horizontally with respect to the first precast concrete wall, and place the second expanded diameter opening end at the tip of the relay member. Connecting. When a pair of precast concrete walls are lined up and a gap is secured at the joint, the outer or inner circumferential surface of the cylindrical body of the relay member is in pressure contact with both buried pipes, so the relay member comes off. Even when filling the joint with filler, the filler does not flow into the buried pipe.

In the fifth invention, in the fourth invention,
Inserting the relay member to the back side of the first diameter enlarged opening end and securing a gap for a joint between the first precast concrete wall and the second precast concrete wall,
When viewed from the side of the relay member and the first expanded diameter opening end, the length of the relay member protruding toward the second expanded diameter opening end is longer than the width of the joint portion. shall be.

According to the above configuration, the distance to the step of the first enlarged diameter opening end, the distance to the step of the second enlarged diameter opening end, the length of the relay member, the width of the joint, etc. are maintained appropriately. By making the protrusion length of the relay member toward the second expanded diameter opening end longer than the width of the joint, the sealing portion of the relay member can be connected to the first expanded diameter opening end and the second expanded diameter opening end. Pressure contact can be maintained. Therefore, it is possible to reliably prevent the filler from flowing into the first buried pipe and the second buried pipe.

In a sixth invention, there is provided a first precast concrete wall with a first opening end protruding from the side surface, and a second precast concrete wall with a second opening end protruding from the side surface at a position opposite to the first opening end. preparing a precast concrete wall and a relay member that presses against the inner peripheral surface of at least both ends of the cylindrical body and the outer peripheral surface of the first and second open ends;
With one end of the relay member inserted into the outer periphery of the first opening end, move the second precast concrete wall to a position where the tip of the relay member faces the second opening end, and The configuration is such that a gap for a joint is secured between the precast concrete wall and the second precast concrete wall.

Even in the above configuration, the inner circumferential surface of the relay member is in pressure contact with the outer circumferential surface of both buried pipes, so when filling the joint with filler, the filler does not flow into the inside of the buried pipes. .

In the seventh invention, in the sixth invention,
After moving the second precast concrete wall closer to the first precast concrete wall,
The relay member inserted into the first opening end is horizontally moved toward the second opening end.

According to the above configuration, since the relay member is moved after the second precast concrete wall is moved, the second opening end and the relay member do not come into contact with each other when the second precast concrete wall is moved, and are less likely to be damaged.

In the method for installing a precast concrete wall according to the eighth aspect of the invention, the first enlarged diameter opening end of the first buried pipe opens at the side surface opposite to the side surface of the second precast concrete wall, and the second enlarged diameter opening end of the second buried pipe First and second precast concrete walls in which the first and second buried pipes are respectively buried so that the diameter opening end opens on the side surface opposite to the side surface of the first precast concrete wall, and the outer periphery of both ends of the cylindrical main body. preparing a relay member for a precast concrete wall buried pipe whose surface or inner circumferential surface is in pressure contact with the inner circumferential surface or outer circumferential surface of the first and second buried pipes;
Inserting the relay member until it abuts on the back side of the first enlarged diameter opening end,
With the relay member inserted into the back side of the first enlarged diameter opening end, the second precast concrete wall is moved to a predetermined position, and the relay member protruded from the first enlarged diameter opening end, The relay member is moved horizontally so that its tip is inserted into the second enlarged diameter opening end, and the outer peripheral surface or inner peripheral surface of the relay member is pressed against the first buried pipe and the second buried pipe. While doing so, the structure is such that a gap for a joint part is secured between the first precast concrete wall and the second precast concrete wall.

According to the above configuration, when manufacturing the first and second precast concrete walls, the first and second enlarged diameter opening ends are buried, and the relay member is placed on the side of the first enlarged diameter opening end. With the second precast concrete wall inserted until it touches the inner surface on the back side of the enlarged diameter opening end, move the second precast concrete wall to a predetermined position with respect to the first precast concrete wall, and remove the relay that has protruded from the first enlarged diameter opening end. The member is moved horizontally, and the distal end of the relay member is connected to the second enlarged diameter opening end. When a pair of precast concrete walls are lined up and a gap is secured at the joint, the outer or inner circumferential surface of the cylindrical body of the relay member is in pressure contact with both buried pipes, so the relay member comes off. Even when filling the joint with filler, the filler does not flow into the buried pipe. Moreover, since the relay member is moved after the second precast concrete wall is moved, the second opening end and the relay member do not come into contact with each other when the second precast concrete wall is moved, and are less likely to be damaged.

In the ninth invention, in any one of the first to third inventions,
At least the intermediate portion in the longitudinal direction of the cylindrical body is subjected to surface roughening treatment to improve adhesion with the filler.

According to the above configuration, it is advantageous that the unevenness at the level of roughening is provided without providing large unevenness in the longitudinal intermediate portion, since the adhesion with the filler is improved.

As described above, according to the present invention, by using a relay member that presses against the buried pipes, the buried pipes can be reliably connected to each other while preventing the filler filling the joint from flowing into the buried pipes.

It is an exploded sectional view showing a relay member insertion process of a precast concrete wall concerning Embodiment 1 of the present invention. FIG. 2 is a sectional view showing a step of dropping a precast concrete wall according to Embodiment 1 of the present invention. It is a sectional view showing a mortar filling process of the precast concrete wall concerning Embodiment 1 of the present invention. 1 is a sectional view showing a joint structure including a relay 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 steel plate dowel side, and (b) shows a side surface on the groove side. FIG. 2 is a perspective view showing how a pair of precast concrete walls are connected by dropping. FIG. 2 is a sectional view corresponding to FIG. 1 according to Embodiment 2 of the present invention. FIG. 2 is a sectional view corresponding to FIG. 2 according to Embodiment 2 of the present invention. FIG. 4 is a sectional view corresponding to FIG. 3 according to Embodiment 2 of the present invention. FIG. 3 is a sectional view corresponding to FIG. 3 according to a first modification of the second embodiment of the present invention. FIG. 3 is a sectional view corresponding to FIG. 3 according to a second modification of the second embodiment of the present invention. FIG. 3 is a sectional view corresponding to FIG. 3 according to a third modification of the second embodiment of the present invention. FIG. 3 is a sectional view corresponding to FIG. 2 according to Embodiment 3 of the present invention. FIG. 4 is a sectional view corresponding to FIG. 3 according to Embodiment 3 of the present invention. FIG. 2 is a sectional view corresponding to FIG. 2 according to a modification of Embodiment 3 of the present invention. FIG. 4 is a sectional view corresponding to FIG. 3 according to a modification of Embodiment 3 of the present invention.

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

(Embodiment 1)
FIG. 4 shows a joint structure 1 including a relay member for a pipe buried in a precast concrete wall that connects buried pipes 4 and 4' buried inside a pair of precast concrete walls 2 and 2'. As shown in Fig. 4, 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.

For example, as shown in FIGS. 5 and 6, 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. A vertically extending steel plate dowel 40 is embedded in one side of the precast concrete walls 2, 2', and a groove 41 into which the steel plate dowel 40 fits is formed in the other side. 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 by dropping.

As shown enlarged in FIGS. 1 to 3, this joint member has a cylindrical shape with a first straight pipe section 11 connected to one end of a first buried pipe 4 inside one first precast concrete wall 2. A cylindrical second buried pipe connection part 20 in which a second straight pipe part 21 is connected to the first buried pipe connection part 10 and one end of the second buried pipe 4' inside the other second precast concrete wall 2'. It is equipped with The first and second buried pipes 4, 4' are made of, for example, a general-purpose hard vinyl chloride electric conduit. The present embodiment is directed to buried pipes 4, 4' buried inside railings of highways and the like. Further, the first buried pipe connecting portion 10 and the second buried pipe connecting portion 20 are made of resin molded products such as hard vinyl chloride having different shapes, for example. The first straight pipe section 11 and the first buried pipe 4 are connected by a first socket 16. The second straight pipe section 21 and the second buried pipe 4' are connected by a second socket 26. Note that the inner diameters of the first straight pipe part 11 and the second straight pipe part 21 are made slightly larger than the outer diameters of the buried pipes 4 and 4', so that the straight pipe parts 11 and 21 are connected to the buried pipes 4 and 4'. You may also insert .

Insertion holes 14 and 15 as engaged parts are formed on the other end side of the first buried pipe connecting part 10, that is, on the first enlarged diameter opening end part 12 on the side surface side of the first precast concrete wall 2. . In this embodiment, the upper insertion hole 14 is penetrated diagonally inward by the protrusion 13 that expands radially outward from the same surface as the side surface of the first precast concrete wall 2 . The lower insertion hole 15 is vertically penetrated directly below the upper insertion hole 14. By doing so, while the height of the surface of the first enlarged diameter opening end 12 and the height of the side surfaces of the first and second precast concrete walls 2, 2' are aligned, insertion and removal of the slip-off prevention member 30 can be smoothly performed. It is now possible to do so.

The second enlarged diameter open end 22 on the other end side of the second buried pipe connection section 20 has a shorter axial length than the first enlarged diameter open end 12 of the first buried pipe connection section 10 . The first and second enlarged-diameter opening ends 12 and 22 have larger inner diameters than the first and second straight pipe parts 11 and 21, respectively.

As shown in FIG. 1, the joint structure 1 includes a relay member 6 that can be entirely accommodated inside the first enlarged diameter opening end 12. As shown in FIG. The relay member 6 is made of, for example, a cylindrical resin molded product. The length of the relay member 6 is such that the entirety of the relay member 6 enters inside the first enlarged diameter opening end 12, and both ends are chamfered. Therefore, it can be smoothly inserted into the first enlarged diameter opening end 12 and the second enlarged diameter opening end 22. Further, the outer periphery of the relay member 6 is marked, particularly at the central portion in the longitudinal direction, by being colored red. A water-swellable nonwoven fabric 8 that expands when it contains water is wrapped around the outer periphery of both ends of the relay member 6. Therefore, when filling the mortar 3 as a filler, the moisture in the mortar 3 swells the water-swellable nonwoven fabric 8, preventing the mortar 3 from flowing into the first and second buried pipes 4, 4'. There is. The sealing material is not limited to the water-swellable nonwoven fabric 8, but may be a sealing material that does not have water-swelling performance and simply has watertightness. As shown in FIGS. 2 and 3, when one end of the relay member 6 is accommodated in the first buried pipe connection section 10, it comes into contact with the tapered part of the first enlarged diameter opening end 12, and as shown in FIG. When the slip-off prevention member 30 is removed in this way, the other end comes into contact with the tapered portion of the second enlarged diameter opening end 22. Since the longitudinal center portion of the relay member 6 is recessed, when pouring the mortar 3, the mortar 3 also flows into this recess, and the relay member 6 is firmly fixed. For this reason, the relay member 6 does not move during the subsequent cable wiring work. On the other hand, when wiring work such as a cable is performed before filling the mortar 3, a retaining ring may be attached to this recess to prevent the relay member 6 from moving. If chamfers are provided on the inner surfaces of both ends of the relay member 6, the wires will be less likely to be caught on the relay member 6 during wiring work, and can be inserted smoothly.

Further, the joint structure 1 includes a compression coil spring 7 as a cylindrical biasing member that can be entirely accommodated inside the first buried pipe connection section 10 on the back side of the relay member 6 . 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 has a size that fits inside the first buried pipe connection part 10 together with the relay member 6 in a compressed state, and has a smooth inner periphery so that cables etc. will not get caught after being buried. It is desirable to have a surface. The outer diameter of the compression coil spring 7 is slightly smaller than the inner diameter of the first enlarged diameter open end 12 of the first buried pipe connection part 10 and larger than the inner diameter of the relay member 6.

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 wires and the like are less likely to get caught on the inner circumferential surface of the compression coil spring 7 during wiring work.

The inner diameter of the second enlarged diameter open end 22 of the second buried pipe connection section 20 is slightly larger than the outer diameter of the relay member 6, and the depth is shorter than the first enlarged diameter open end 12.

Then, in the joint structure 1, the relay member 6 pushes the compression coil spring 7 and is accommodated in the first buried pipe connection part 10, and engages with the upper and lower insertion holes 14, 15, and the relay member 6 and the compression coil spring 7 A slip-off prevention member 30 made of a rod-shaped member is provided to prevent the slip-off. The detachment prevention member 30 is preferably made of, for example, a long and thin wire-like member, and has a rigidity sufficient to resist the biasing force of the compression coil spring 7.

A tension member 31 is connected to the slip-off preventing member 30 to pull out the slip-off preventing member 30 from the insertion holes 14 and 15 by being pulled. For example, the tension member 31 is made of a string having an appropriate tensile strength and tied to the upper end of the slip-off prevention member 30.

As shown in FIG. The first buried pipe 4 and the second buried pipe 4' are configured to be connectable.

In addition, the joint members for the buried pipe in the precast concrete wall in this embodiment include the first buried pipe connection part 10, the second buried pipe connection part 20, the relay member 6, the compression coil spring 7, the pull-out prevention member 30, and the tension member 31. Become.

As shown in FIG. 3, in the joint structure 1 for a precast concrete wall buried pipe of the present embodiment, the first enlarged diameter open end 12 of the first buried pipe connecting portion 10 connected to the first buried pipe 4 is connected to the first buried pipe 4. The first buried pipe connection part opens at the joint between the side surfaces of the second precast concrete wall 2' and the opposing side, and the relay member 6 is biased toward the second precast concrete wall 2' by the compression coil spring 7. 10 and the second buried pipe connection part 20, and is filled between the joint part and the outer peripheral surface of the relay member 6 and the inner peripheral surfaces of the first and second enlarged diameter opening ends 12, 22. It is filled with mortar 3 as an agent.

-How to install precast concrete walls-
Next, a joint structure for a pipe buried in a precast concrete wall and a method for installing a precast concrete wall will be described.

In the preparation process, the above-mentioned first and second buried pipes 4, 4', first buried pipe connection part 10, second buried pipe connection part 20, relay member 6, slippage prevention member 30, tension member 31, etc. are prepared. .

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

Next, in a reinforcing bar assembly process, rod-shaped and annular reinforcing bars 51 are arranged within the formwork. Further, a steel plate dowel 40 is also provided on one side surface.

Next, in the buried pipe installation process, the first straight pipe part 11 of the first buried pipe connection part 10 is connected to one end of the first buried pipe 4 in the formwork, as shown in an enlarged view in FIG. 16, and the second straight pipe part 21 of the second buried pipe connection part 20 is connected to one end of the second buried pipe 4' using the second socket 26. In addition, speaking of the entire first buried pipe 4 shown in the center of FIG. 4, the first buried pipe connecting part 10 is connected to the right end, and the second buried pipe connecting part 20 is connected to the left end. Ru.

Then, the first enlarged diameter opening end 12 of the first buried pipe connection part 10 opens to the side surface opposite to the side surface of the second precast concrete wall 2', and the second enlarged diameter opening end part 12 of the second buried pipe connection part 20 The first and second buried pipes 4, 4' are arranged in the formwork so that the radially open ends 22 open to the side surface opposite to the side surface of the first 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 as shown in FIG. 1, precast concrete walls 2, 2' are completed.

Next, as shown in FIG. 1, in the relay member insertion step, after inserting the compression coil spring 7 into the first buried pipe connecting portion 10, the relay member 6 is inserted and held while pressing the compression coil spring 7. At this time, since the outer circumferential end of the relay member 6 is chamfered and the inner circumferential surface of the first enlarged diameter opening end 12 is provided with a tapered surface, insertion is easy.

Next, as shown in FIG. 2, in the relay member holding step, the distal end of the slip-off preventing member 30 with the tension member 31 tied to the proximal end is inserted into the upper insertion hole 14, and then inserted into the lower insertion hole 15. , let go of the relay member 6 that was being held. As shown in FIG. 2, the relay member 6 does not protrude from the sides of the first and second precast concrete walls 2, 2'.

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, as shown in FIG. 6, in the drop-in process, the pair of precast concrete walls 2, 2 are inserted in a state in which the retaining member 30 is engaged with the insertion holes 14, 15 to prevent the relay member 6 from coming off. ' are arranged by dropping them using a crane or the like while making sure that the steel plate dowels 40 fit into the grooves 41, resulting in the state shown in FIG. At this time, the tension member 31 is placed at a position where the operator can pull it. The gap between the pair of precast concrete walls 2, 2' becomes a joint.

Next, in the removal prevention member extraction step, the removal prevention member 30 is pulled out from the insertion holes 14 and 15 by pulling the tension member 31.

Then, as shown in FIG. 3, the first enlarged diameter open end 12 and the second enlarged diameter open end 22 are connected by the relay member 6 urged by the compression coil spring 7. As a result, the buried pipes 4, 4' are connected to each other in a sealed manner. At this time, since the outer circumferential end of the relay member 6 is chamfered and the inner circumferential surface of the second enlarged diameter opening end 22 is provided with a tapered surface, it is easy to penetrate deep into the relay member 6 when it pops out.

At this time, the outer periphery of the relay member 6 is marked, so by checking the marking from the gap between the first and second precast concrete walls 2 and 2', it is confirmed that the relay member 6 has definitely popped out. can.

After confirmation, as shown in FIG. 3, in the mortar filling process, the joint between the first and second precast concrete walls 2, 2', the outer peripheral surface of the relay member 6, and the inner periphery of the enlarged diameter opening ends 12, 22. Fill mortar 3 between the surfaces. 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 relay member 6, this water-swellable non-woven fabric 8 swells with the moisture of the mortar, and the first diameter-expanded opening end 12 and the second enlarged diameter opening end 22 can be reliably sealed. Therefore, the mortar 3 does not flow into the first and second buried pipes 4, 4'. At this time, depending on the first and second enlarged diameter opening ends 12 and 22 and the sealing material, the mortar 3 may reach the inner peripheral surfaces of the first and second enlarged diameter opening ends 12 and 22. It doesn't flow in.

Next, after the filler 3 dries, electric wires and the like are wired inside the buried pipe 4. After the first and second precast concrete walls 2, 2' are connected, the slip-off prevention member 30 and the tension member 31 are removed, and the compression coil spring 7 and the relay member 6 remain, but since they are cylindrical, the It does not get in the way when inserting cables etc. into the first and second buried pipes 4, 4'. Note that what is inserted into the buried pipes 4, 4' is not limited to electric wires or the like.

Therefore, by using the relay member 6 having the water-swellable nonwoven fabric 8 of the precast concrete wall-embedded pipe according to this embodiment, the mortar 3 filling the joints can be applied to the first and second buried pipes 4, 4'. The buried pipes 4 and 4' can be connected to each other so that they do not flow into the inside of the pipe.

(Embodiment 2)
7 to 9A show a joint structure 101 for a pipe buried in a precast concrete wall according to a second embodiment of the present invention, which differs from the first embodiment mainly in that a compression coil spring 7 or the like is not used. In the following embodiments and modifications, the same parts as in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

The relay member 106 of this embodiment is also a relay member 106 of a precast concrete wall buried pipe that connects buried pipes 4, 4' buried inside a pair of precast concrete walls 2, 2' at a joint portion 3, As in the first embodiment, water-swellable nonwoven fabrics 108 are provided on the outer circumferential surfaces of both ends of the cylindrical main body 106a to press against the inner circumferential surfaces of the buried pipes 4, 4'. The sealing material is not limited to the water-swellable nonwoven fabric 108, and may be a sealing material that does not have water-swelling performance and simply has watertightness.

In this embodiment, as in the first embodiment, first, a relay member 106, a first buried pipe 4 having a first buried pipe connection part 10, and a second buried pipe 4' having a second buried pipe connection part 20 are connected. Prepare. Specifically, similarly to Embodiment 1, when focusing on one joint 3, the first buried pipe 4 is connected to the first buried pipe connecting part 10, and the second buried pipe 4' is connected to the second buried pipe 4'. A buried pipe connection section 20 is connected.

In this embodiment, as shown in FIG. 9A in particular, the length of the cylindrical body 106a is within the range in which the cylindrical body 106a can move along the longitudinal direction within the region of the joint portion 3. always comes into contact with the inner circumferential surfaces of both the first and second enlarged diameter open ends 12, 22 of the first and second buried pipe connecting parts 10, 20 buried in the pair of precast concrete walls 2, 2'. It is set as follows.

Next, the construction method will be described. First, as in the first embodiment, the first enlarged diameter open end 12 of the first buried pipe 4 opens at the side surface opposite to the side surface of the second precast concrete wall 2', and The first and second buried pipes 4 and 4' are arranged in the formwork so that the second enlarged diameter opening end 22 of the second buried pipe 4' opens to the side surface opposite to the side surface of the first precast concrete wall 2. do.

Next, as in the first embodiment, concrete is poured into the formwork to form the first and second precast concrete walls 2, 2'.

Next, as shown in FIGS. 7 and 8, the first and second enlarged diameter open ends 12, 22 (the first and second The relay member 106 that connects the two buried pipe connecting portions 10 and 20) is inserted until it abuts on the back side of the first enlarged diameter opening end portion 12.

Next, as shown in FIG. 9A, with the relay member 106 inserted into the back step 17 of the first enlarged diameter opening end 12, the second precast concrete wall 2' is inserted into the first enlarged diameter opening end. The water-swellable nonwoven fabric 108 of the relay member 106 is moved horizontally so that the tip of the relay member 106 protruding from the second buried pipe 4 and the second buried pipe 12 is inserted into the second enlarged diameter opening end 22. 4', a gap for the joint part 3 is secured between the first precast concrete wall 2 and the second precast concrete wall 2'. The joint portion 3 has a tolerance of -5 mm to +15 mm, for example, based on 20 mm.

The relay member 106 is inserted into the back side of this first enlarged diameter opening end 12, and a gap for the joint 3 is secured between the first precast concrete wall 2 and the second precast concrete wall 2'. As shown in FIG. 9A, when viewed from the side, the protrusion length b of the relay member 106 toward the second enlarged diameter opening end 22 is longer than the width a of the joint portion 3 (b> a).

Next, in this state, a filler such as mortar is filled between the joint portion 3 and the outer peripheral surface of the relay member 106.

As described above, in this embodiment, the distance from the first enlarged diameter opening end 12 to the back step 17, the distance from the second enlarged diameter opening end 22 to the back step 27, and the length of the relay member 106 are adjusted. Now, by keeping the width a of the joint part 3 appropriate and making the protrusion length b of the relay member 106 toward the second enlarged diameter opening end 22 longer than the width a of the joint part 3, water in the relay member 106 can be reduced. The expandable nonwoven fabric 108 can always maintain pressure contact with the first enlarged diameter open end 12 and the second enlarged diameter open end 22. Therefore, even if the relay member 106 moves in the axial direction, the filler can be reliably prevented from flowing into the first buried pipe 4 and the second buried pipe 4'.

As explained above, according to the present invention, by using the relay member 106 provided with the water-swellable nonwoven fabric 108, it is possible to prevent the filler filling the joint portion 3 from flowing into the buried pipes 4, 4'. The pipes 4 and 4' can be connected to each other.

-Modification 1-
In the second embodiment, a recess is provided at the longitudinal center of the cylindrical main body 106a of the relay member 106, but a protrusion 406b may be provided at the longitudinal center of the cylindrical main body 406a, as shown in FIG. 9B.

In this way, the protrusion 406b exhibits the effect of positioning the relay member 406, and the relay member 406 is reliably fixed.

-Modification 2-
In addition to the above modification 1, as shown in FIG. 9C, a C-shaped retaining ring 406c may be further fixed to the cylindrical main body 406a.

By providing the C-shaped retaining ring 406c, it is possible to cope with the case where the joint portion 3 is wide, and the relay member 406 is reliably fixed.

-Modification 3-
In the second embodiment, the outer periphery of the first enlarged diameter opening end 12 and the second enlarged diameter opening end 22 on the side of the joint 3 is flat, but as shown in FIG. 9D, the outer diameter is gradually increased. The first expanded diameter opening end 512 and the second expanded diameter opening end 522 may be expanded to form flared ends 512a, 522a. This makes it easier to insert the relay member 506.

Furthermore, in the second embodiment, the second precast concrete wall 2' is moved horizontally to bring it closer to the first precast concrete wall 2, but in this modification, the second precast concrete wall 2' is moved in the vertical direction. After lowering the relay member 506 to the position, the relay member 506 can be horizontally moved and inserted into the second enlarged diameter opening end 522 side. In this way, since the relay member 506 is moved horizontally after the second precast concrete wall 2' is moved, the second enlarged diameter opening end 522 and the relay member 506 do not come into contact with each other when the second precast concrete wall 2' moves. , not easy to damage. In this case as well, the flared shape is advantageous because the insertion work of the relay member 506 becomes easier.

(Embodiment 3)
10 and 11 show a relay member 206 according to Embodiment 3 of the present invention, which differs from Embodiments 1 and 2 above in that a sealing material is provided on the inner peripheral surface of a cylindrical main body 206a.

In this embodiment, a water-swellable nonwoven fabric 208 is provided on the inner circumferential surface of both ends of the cylindrical main body 206a as a sealing material that expands while in contact with the outer circumferential surfaces of the first and second buried pipes 4, 4'. ing. The sealing material is not limited to the water-swellable nonwoven fabric 208, and may be a sealing material that does not have water-swelling performance and simply has watertightness. In this embodiment, there may be a portion in the longitudinal center portion of the cylindrical main body 206a where the water-swellable nonwoven fabric 208 is not provided.

In this embodiment, the first and second enlarged diameter opening ends 12, 22 are not provided as in the first and second embodiments, and the first and second buried pipes 4, 4' are connected to the first and second buried pipes 4, 4'. 2. It has a shape that protrudes a predetermined length from the side surface of the precast concrete walls 2, 2'.

The joint portion 3 in this embodiment is wider than those in the first and second embodiments described above by the opening end portions 210 and 220.

Next, to explain the construction method, first, the first open end 210 of the first buried pipe 4, which has not been expanded in diameter, is opened in a state protruding from the side surface opposite to the side surface of the second precast concrete wall 2', and The first and second buried pipes 4 and 4 are arranged so that the second open end 220 of the second buried pipe 4', which has not been expanded in diameter, is opened in a state protruding from the side surface opposite to the side surface of the first precast concrete wall 2. 'Place in the formwork.

Next, with the first opening end 210 and the second opening end 220 protruding in this manner, concrete is poured into the formwork, and the mold is removed to form the first and second precast concrete walls 2, 2'. form.

Next, as shown in FIG. 10, one end of the relay member 206 is inserted into the first open end 210, and the water-swellable nonwoven fabric 208 is brought into contact with the outer periphery of the first open end 210.

Next, as shown in FIG. 11, with the relay member 206 inserted into the outer periphery of the first open end 210, the second precast concrete wall 2' is inserted into the tip of the relay member 206 protruding from the first open end 210. is inserted into the second open end 220, and the water-swellable nonwoven fabric 208 of the relay member 206 is pressed against the outer peripheral surface of the second open end 220 of the second buried pipe 4'. At the same time, a gap for the joint portion 3 is secured between the first precast concrete wall 2 and the second precast concrete wall 2'.

Next, in this state, a filler such as mortar is filled between the joint portion 3 and the outer peripheral surface of the relay member 206.

In this embodiment, when the joint portion 3 is filled with a filler such as mortar, the water-swellable nonwoven fabric 208 swells due to moisture contained in the filler, so that the inner peripheral surface of both ends of the cylindrical main body 206a and the buried It can be reliably sealed with the outer peripheral surfaces of the first and second open ends 210, 220 of the tubes 4, 4', and the filler will not flow into the first and second buried tubes 4, 4'.

Note that although the relay member 206 does not have a recessed portion in the central portion, a recessed portion may be provided in the central portion.

-Modified example-
Further, as shown in FIGS. 12 and 13, as a relay member 306 according to a modification of the present embodiment, a water-swellable nonwoven fabric 308 is provided on the entire inner surface of a cylindrical main body 306a.

In this case, the width of the joint portion 3 is wider than in the first and second embodiments. Therefore, the filler may be other than mortar.

Note that although the relay member 306 does not have a recessed portion in the central portion, a recessed portion may be provided in the central portion.

In this modification, as shown in FIG. 12, when inserting one end of the relay member 306 into the first open end 310, for example, insert it until the other end is aligned with the tip of the first buried pipe 4. In this state, the water-swellable nonwoven fabric 308 is brought into contact with the outer periphery of the first open end 310.

Next, as shown in FIG. 12, with the relay member 306 inserted around the outer periphery of the first open end 310, the second precast concrete wall 2' is opened at a position facing the first open end 310. Move it horizontally so that the end portion 320 is located to ensure a gap for the joint portion 3.

Next, as shown in FIG. 13, the relay member 306 is slid toward the second open end 320, and the water-swellable nonwoven fabric 308 on the inner peripheral surface is attached to the outer periphery of the second open end 320 of the second buried pipe 4'. Bring it into contact with the surface.

Next, in this state, a filler such as mortar is filled between the joint portion 3 and the outer peripheral surface of the relay member 206.

In this modification, since the relay member 306 is moved after the second precast concrete wall 2' is moved, the second open end 320 and the relay member 306 do not come into contact with each other when the second precast concrete wall 2' moves, resulting in damage. It's hard to do.

Also in this modification, when the joint portion 3 is filled with mortar or the like as a filler, the water-swellable nonwoven fabric 308 swells due to the moisture contained in the filler, so that the inner peripheral surface of both ends of the cylindrical main body 306a, It is possible to securely seal between the outer peripheral surfaces of the first and second open ends 310 and 320 of the buried pipes 4 and 4', and the filler does not flow into the first and second buried pipes 4 and 4'.

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

That is, in each of the above embodiments, as shown in FIG. 4, 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 that case, it may be pulled out from the lower slip-off prevention member 30. This is because it is difficult to check the status of the relay members 6, 206, 306 on the lower side if it is done from above. Further, it is preferable that the colors of the markings are different between the upper relay member 6 and the lower relay member 6. This makes it easy to see which relay member 6 is insufficiently protruding when viewed from a distance.

In the first and second embodiments described above, the water-swellable nonwoven fabric 8 is provided on the outer peripheral surface side of the relay member 6, but instead or in addition, the inner peripheral surface of the first and second buried pipe connecting parts 10 and 20 is provided. A water-swellable nonwoven fabric 8 may be provided on the side.

Further, although not shown, at least the intermediate portion in the longitudinal direction of the cylindrical main body 106a may be subjected to surface roughening treatment to improve adhesion to the mortar 3. This is advantageous because good adhesion to the mortar 3 can be obtained without having to provide large irregularities in the longitudinally intermediate portion.

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
6 Relay member
7 Compression coil spring (biasing member)
8 Water-swellable nonwoven fabric
10 First buried pipe connection section
11 First straight pipe section
12 First expanded diameter opening end
13 Projection
14, 15 Insertion hole (engaged part)
16 1st socket
20 Second buried pipe connection part
21 Second straight pipe section
22 Second enlarged diameter opening end
26 2nd socket
30 Fallout prevention member
31 Tension member
40 Steel plate dowel
41 Groove
51 Rebar
101 Joint structure
106 Relay member
106a Cylindrical body
108 Water-swellable nonwoven fabric
206 Relay member
206a Cylindrical body
208 Water-swellable nonwoven fabric
210 First opening end
220 Second opening end
306 Relay member
306a Cylindrical body
308 Water-swellable nonwoven fabric
310 First opening end
320 Second opening end portion 406 Relay member
406a Cylindrical body
406b Protrusion
406c C type retaining ring
506 Relay member
512 First enlarged diameter opening end
512a, 522a Flared end
522 Second enlarged diameter opening end

Claims (8)

A relay member for a buried pipe in a precast concrete wall that connects buried pipes buried inside a pair of precast concrete walls at a joint part,
The longitudinally intermediate portion of the cylindrical body is recessed with respect to both end portions,
The both end portions and the longitudinal intermediate portion have flat cylindrical surfaces,
A relay member for a precast concrete wall buried pipe, characterized in that a water-expandable sealing material that expands while in contact with the inner peripheral surface of the buried pipe is provided on the outer peripheral surface of the both end portions . A precast concrete wall that connects a large number of precast concrete walls by dropping in on-site, or connects buried pipes buried inside a pair of precast concrete walls at joints with a tolerance of -5 mm to +15 mm based on 20 mm. A relay member for an internally buried pipe,
The outer peripheral surface of both ends of the cylindrical body is configured to come into pressure contact with the inner peripheral surface of the buried pipe,
The length of the cylindrical body is within the range in which the cylindrical body can move along the longitudinal direction within the joint area, and the outer circumferential surface of the cylindrical body extends between both of the buried pipes of the pair of precast concrete walls. It is set so that it comes into pressure contact with the inner peripheral surface ,
A relay member for a pipe buried in a precast concrete wall, characterized in that the outer periphery of the central portion in the longitudinal direction of the cylindrical body is marked . The first enlarged diameter opening end of the first buried pipe opens flush with the side surface opposite to the side surface of the second precast concrete wall, and the second enlarged diameter opening end of the second buried pipe opens on the first precast concrete wall. first and second precast concrete walls in which first and second buried pipes are buried , respectively , so as to open flush with the side surface opposite to the side surface of the main body; 2. Prepare a relay member for the precast concrete wall buried pipe that presses against the inner circumferential surface of the buried pipe,
Inserting the relay member until it abuts the back step of the first enlarged diameter opening end,
With the relay member inserted into the back side of the first diameter-expanding opening end, the tip of the relay member protruding from the first diameter-expanding opening end of the second precast concrete wall is connected to the second diameter-expanding opening end. The first precast concrete wall and the second precast concrete wall are moved horizontally so as to be inserted into the open end, and the outer circumferential surface of the relay member is brought into pressure contact with the first buried pipe and the second buried pipe. A precast concrete wall installation method characterized by securing gaps for joints between the walls. The method for installing a precast concrete wall according to claim 3 , comprising:
Inserting the relay member to the back side of the first diameter enlarged opening end and securing a gap for a joint between the first precast concrete wall and the second precast concrete wall,
When viewed from the side of the relay member and the first expanded diameter opening end, the length of the relay member protruding toward the second expanded diameter opening end is longer than the width of the joint portion. A precast concrete wall installation method featuring: a first precast concrete wall having a first open end protruding from the side surface; a second precast concrete wall having a second open end protruding from the side surface at a position opposite to the first open end; preparing relay members that are pressed into contact with the outer circumferential surfaces of the first and second open ends on the inner circumferential surfaces of both ends of the cylindrical main body;
With one end of the relay member provided with a water-expandable seal on the inner peripheral surface of both ends inserted into the outer periphery of the first opening end, the second precast concrete wall is inserted so that the tip of the relay member is connected to the first end of the relay member. 2. A method for installing a precast concrete wall, which comprises moving the first precast concrete wall to a position facing two opening ends, and securing a gap for a joint between the first precast concrete wall and the second precast concrete wall. The method for installing a precast concrete wall according to claim 5 ,
After moving the second precast concrete wall closer to the first precast concrete wall,
A method for installing a precast concrete wall, comprising horizontally moving the relay member inserted into the first opening end toward the second opening end. The first enlarged diameter opening end of the first buried pipe opens flush with the side surface opposite to the side surface of the second precast concrete wall, and the second enlarged diameter opening end of the second buried pipe opens on the first precast concrete wall. first and second precast concrete walls in which first and second buried pipes are buried , respectively , so as to open flush with the side surface opposite to the side surface of the main body; 2. Prepare a relay member for the precast concrete wall buried pipe that presses against the inner circumferential surface of the buried pipe,
Inserting the relay member until it abuts the back step of the first enlarged diameter opening end,
With the relay member inserted into the back side of the first diameter-enlarged opening end, move the second precast concrete wall to a predetermined position, and remove the relay member that has protruded from the first diameter-enlarged opening end. The relay member is moved horizontally so that its distal end is inserted into the second enlarged diameter opening end, and the outer peripheral surface of the relay member is pressed against the first buried pipe and the second buried pipe. A method for installing a precast concrete wall, which comprises securing a gap for a joint between a first precast concrete wall and a second precast concrete wall. In the relay member for a precast concrete wall buried pipe according to claim 1 or 2 ,
A relay member for a pipe buried in a precast concrete wall, characterized in that at least an intermediate portion in the longitudinal direction of the cylindrical main body is subjected to surface roughening treatment to improve adhesion with a filler.

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