JP2940876B2 - Buried pipe fitting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to, for example, a method of forming a horizontal pipe portion of an existing pipe already buried and a horizontal end portion of a new pipe to be newly buried in a pipe fluid. In the uninterrupted state while maintaining the flow of the first buried pipe, the first buried pipe is connected to the through-hole formed in the peripheral wall of the horizontal pipe section in a substantially T-shape in plan view.
The present invention relates to a pipe joint structure for communicating and connecting a horizontal pipe end of a second buried pipe from a direction crossing a pipe axis of the buried pipe.

[Conventional technology]

In a conventional pipe connection structure for a buried pipe, a moving passage of a drilling device for forming the through hole is formed in an upper part of a joint case externally fixed to the horizontal pipe portion of the first buried pipe in a liquid-tight or air-tight state. A first joint pipe portion provided with a communication flow path is formed so as to be continuous along the vertical direction, and a pipe shaft of the first joint pipe portion is provided at an intermediate portion of the first joint pipe portion in the tube axis center direction. A second joint pipe section having a horizontal flow path communicating from the horizontal direction to the communication flow path in a posture orthogonal to the core is continuously provided, and a distal end portion of the second joint pipe section includes A connecting portion for connecting the horizontal pipe end of the second buried pipe from the horizontal direction is formed,
Further, a connecting portion for fixedly connecting a lid for closing an opening of the first joint tube or a gate valve for opening and closing the opening of the first joint tube is formed at an upper end portion of the first joint tube. (See, for example, Japanese Utility Model Laid-Open No. 31609/1986).

[Problems to be solved by the invention]

In this conventional pipe joint structure of a buried pipe, a joint component for communicating and connecting a through hole formed in a horizontal pipe portion of the first buried pipe and a horizontal pipe end of the second buried pipe, that is, a joint case, Since the communication flow path of the first joint pipe portion of the first joint pipe portion and the second joint pipe portion is also configured as a moving passage of the drilling device forming the through hole, for example, the first buried pipe In a casing surrounding the horizontal pipe portion in a watertight state, a flow path switching valve is connected to the first buried pipe in a watertight state, and then the casing is removed and the second buried pipe is connected to the valve. There is an advantage that simplification and efficiency of on-site construction can be achieved as compared with the case where the horizontal pipe ends are connected.

However, in the conventional pipe connection structure of a buried pipe, the first joint pipe section is continuously provided in a vertical posture with respect to a joint case externally fixed to the horizontal pipe section of the first buried pipe.
When a working device such as a perforation device is mounted via a gate valve fixedly connected to a connecting portion on the upper end side of the first horizontal pipe portion, the height of the working device above the ground increases, and workability decreases in this plane. Was.

In addition, the second joint pipe portion connected to the horizontal pipe end of the second buried pipe is continuously provided in a horizontal posture orthogonal to the pipe axial center portion of the first joint pipe portion. As shown in FIG. 6, the distance from the pipe axis of the first buried pipe (0A) to the pipe axis of the second joint pipe part (04) connected to the first joint pipe part (0B). Only the embedding depth (h) of the second buried pipe (0C)
Had the drawback of becoming shallow.

As a method for embedding the first buried pipe (0A) and the second buried pipe (0C) at the same embedding depth (h), for example, as shown in FIG. The distance between the pipe end of (0C) and the pipe axis of the second joint pipe (04) connected to the first joint pipe (0B) from the pipe axis of the first buried pipe (0A). In a state where a step corresponding to the above is formed, two portions in the pipe axis direction are bent and formed, or as shown in FIG. 8, the second joint pipe part (04) is connected to the first joint pipe part. (0
B) The pipes are downwardly connected at an acute crossing angle with respect to B), and the end of the pipe section of the second buried pipe (0C) is bent at an angle corresponding to the inclination angle of the second joint pipe section (04). However, in the case of FIG. 7, a long second buried pipe (0
Since the end of the pipe section C) is bent at two points in the direction of the pipe axis, not only the pressure loss of the fluid increases, but also the bending work of the second buried pipe (0C) becomes large and the construction cost is reduced. It is easy to cause soaring. Also, in the case shown in FIG. 8, the flow direction of the fluid suddenly changes at the connection point between the first joint pipe (0B) and the second joint pipe (04), and the second buried pipe (0C )), There is a bend at the end of the pipe, so that the pressure loss of the fluid increases, and, similarly to the former, the end of the pipe of the long second buried pipe (0C) is bent. Must have
There is a disadvantage that the bending process of the second buried pipe (0C) becomes large-scale and the construction cost tends to increase.

The present invention has been made in view of the above circumstances, and when a working device such as a perforation device is attached via a gate valve fixedly connected to a connection portion on an upper end side of the first joint pipe portion, The height of the working device with respect to the ground is made as low as possible so that the work such as attaching and detaching and moving the working device can be easily performed, and the pressure loss at the joint between the first buried pipe and the second buried pipe. To reduce the construction cost and to reduce the construction cost.
It is an object of the present invention to provide a pipe joint structure that can easily secure an embedded depth of a buried pipe at a predetermined depth.

[Means for solving the problem]

In order to achieve the above object, the characteristic structure of the pipe joint structure of a buried pipe according to claim 1 of the present invention is as follows:
A connecting flow path, which is a moving passage of a drilling device for forming the through hole, is provided on an upper portion of a joint case fixed to the horizontal pipe portion of the first buried pipe in a liquid-tight or air-tight state. 1
A joint pipe section is continuously provided in an upwardly inclined posture that intersects both the vertical direction and the horizontal direction, and a pipe shaft center of the first joint pipe section is provided at an intermediate portion of the first joint pipe section in the pipe axis direction. A second joint pipe portion having an inclined flow path communicating from below with the communication flow path in a posture orthogonal to the second flow path and a horizontal flow path communicating from the horizontal direction to the inclined flow path is provided in series. A connecting portion for connecting the horizontal pipe end of the second buried pipe in a horizontal direction is formed at a tip end of the second joint pipe, and an upper end of the first joint pipe is formed. The portion is formed with a connecting portion for fixedly connecting a lid for closing the opening of the first joint pipe portion or a gate valve for opening and closing the opening of the first joint pipe portion.

Further, a characteristic configuration of the pipe joint structure for a buried pipe according to claim 2 of the present invention is that the joint case is constituted by a split case portion divided into a plurality in the circumferential direction of the first buried pipe.

(Operation)

The first joint pipe portion is connected to an upper portion of a joint case externally fixed to the horizontal pipe portion of the first buried pipe in an upwardly inclined posture that intersects both vertically and horizontally. Therefore, even when a working device such as a perforation device is mounted via a gate valve fixedly connected to the connecting portion on the upper end side of the first joint pipe portion, the height of the working device relative to the ground is reduced as compared with the related art. be able to.

In addition, the second joint pipe section which connects the middle part of the first joint pipe section in the pipe axis center direction and the horizontal pipe end of the second buried pipe is connected to the pipe axis center of the first joint pipe section. Since the inclined flow path communicating with the communication flow path from below and the horizontal flow path communicating with the inclined flow path in a horizontal direction are formed in a posture orthogonal to the first flow path, for example, the first buried pipe Even when the second buried pipe and the second buried pipe are buried at the same burying depth, the number of bends in the flow path from the first joint pipe section to the horizontal pipe end of the second buried pipe can be reduced. No bending angle
The structure can be made looser than the structure shown in the figure, and further, unlike the joint structure shown in FIGS. 7 and 8, there is no need to bend the end of the long second buried pipe.

〔The invention's effect〕

In the pipe joint structure for a buried pipe according to claim 1 of the present invention, when a working device such as a drilling device is attached via a gate valve fixedly connected to a connection portion on an upper end side of the first joint pipe portion, the work is performed. Work such as attachment and detachment and movement of the working device can be easily performed by lowering the ground height of the device as much as possible, and pressure loss at the joint between the first buried pipe and the second buried pipe is suppressed. In addition, it is easy to secure the embedding depth of the second buried pipe at a predetermined depth while reducing the construction cost.

Further, in the pipe connection structure for a buried pipe according to the second aspect of the present invention, even if the horizontal pipe part of the first buried pipe is an intermediate portion in the axial direction of the pipe, the joint case for the horizontal pipe part of the first buried pipe is provided. Can be easily and efficiently performed.

〔Example〕

FIGS. 1 to 5 show the leakage of tap water out of the pipe while maintaining the water supply by the existing water pipe (A) as the first existing pipe which is already buried almost underwater in the ground. A first joint pipe connected to the through-hole (a) by forming a through-hole (a) in the peripheral wall of the horizontal pipe portion of the existing water pipe (A) in an uninterrupted state of preventing water supply. The horizontal pipe end of the new water pipe (C) as the second buried pipe newly buried through the section (B) and the second joint pipe section (4) is connected to the pipe axis of the existing water pipe (A). (X ₂ ) is connected in a direction intersecting with the direction (X ₂ ), and one of the flow paths of the existing water pipe (A) is closed so that the water flow path of the tap water is changed to the first joint pipe section (B) and the second joint pipe. A pipe joint structure for changing a water flow path between an existing water pipe (A) and a new water pipe (C) via a part (4) is shown.

In this pipe joint structure, a first joint pipe part (B) connected to and connected to the through hole (a) and a horizontal pipe end of a new water pipe (C) are connected and connected to a second joint having a circular cross section. Pipe (4)
And a joint case (E) for fixing the lower end side opening (b ₁ ) of the first joint pipe portion (B) to the peripheral wall of the existing water pipe (A) in a watertight state. A detachable work gate (F) for opening and closing the upper end opening (b ₂ ) with respect to the upper end opening (b ₂ ) of the first joint pipe portion (B).
And a lid (9) for closing the upper end side opening (b ₂ ) of the first joint pipe part (B) are configured to be interchangeable.

That is, at the upper part of the joint case (E) externally fixed to the horizontal pipe part of the existing water pipe (A) in a liquid-tight or air-tight state,
A first joint pipe portion (B) having a communication flow path serving as a movement path of a drilling device (7) for forming the through hole (a) is provided,
The first joint pipe section (B) is provided at an intermediate portion in the pipe axis (X ₁ ) direction of the first joint pipe section (B) in an upwardly inclined posture that intersects both the vertical direction and the horizontal direction. ) Having an inclined flow path communicating from below with the communication flow path in a direction perpendicular to the pipe axis (X ₁ ), and a horizontal flow path communicating with the inclined flow path from the horizontal direction. A two-joint pipe section (4) is continuously provided, and a horizontal pipe end of the new water pipe (C) is connected to a distal end of the second joint pipe section (4) from a horizontal direction. Flange joint (10)
A lid (9) for closing an opening of the first joint pipe (B) or an opening of the first joint pipe (B) is provided at an upper end of the first joint pipe (B). A connection flange (5), which is a connecting portion for fixedly connecting a gate valve (F) that opens and closes, is formed.

Further, a bowl-shaped sealing case (G) for operation, which is detachably attached to the gate valve (F), is provided.

The joint case (E) is composed of a split case part (e) that is divided into two parts in the circumferential direction that is externally fitted to the existing water pipe (A), and the inner peripheral surfaces of both ends of the split case part (e) and the existing water pipe ( A seal member (2) is interposed between the outer peripheral surface of A) and the split surface of the split case portion (e).

A communication connection port (3) for the second joint pipe (4) is formed in the first joint pipe (B), and a new water pipe (C) is provided.
A second joint pipe part (4) bent in a U-shape to connect the first joint pipe part (B) to the communication connection port (3).
The pipe connector (J) is integrally connected in a radial direction orthogonal to the axis (X ₁ ) of the pipe connector.

One end opening (b ₁ ) side of the first joint pipe portion (B) is integrally connected to one of the split case portions (e) of the joint case (E), and the joint case (E) is connected to an existing water pipe. By externally fitting to (A), the first joint pipe portion (B) is positioned so that its axis (X ₁ ) and the horizontal axis (X ₂ ) of the existing water pipe (A) are almost orthogonal to each other. Fixed, and further, the first joint pipe portion (B)
Is fixed so that its axis (X ₁ ) is inclined at about 45 ° with respect to the vertical, so that the communication connection port (3) is held in an inclined position facing downward and bent in a dogleg shape. The flange joint (10) of the second joint pipe (4) is fixed along the vertical plane, and the free end side of the second joint pipe (4) is buried substantially horizontally. .

The gate valve (F) is mounted on the connection flange (5) formed on the other end side opening (b ₂ ) side of the first joint pipe portion (B), and a bolt ( By pressing 6), it is connected and fixed to the first joint pipe section (B).

The sealing case (G) is connected to the gate valve (F) by a flange, and is classified into two types, one for perforation and one for lid installation.

As shown in FIG. 1, the drilling case (G ₁ ) is provided with a drive / operation shaft (7 a) equipped with a cutter (7) as a drilling device at the lower end of the ceiling, and the cutter (7). A driving device (8) for rotating and sliding the operation shaft (7a) is mounted on the ceiling, and is slidably and vertically slidably held in a state of being installed.

The lid installation case (G ₂ ) is, as shown in FIG.
In the ceiling portion, an operation shaft (9a) having a lid (9) detachably attached to a lower end is held so as to be vertically slidable together with the lid (9).

As shown in FIGS. 3 and 5, the lid (9) has a rectifying surface (13) for rectifying the flow direction of tap water between the existing water pipe (A) and the new water pipe (C). A straightening member (12) formed in a series of curved cylinders is provided continuously.

The straightening member (12) is a curved tubular first straightening surface (13) that straightens over the existing water pipe (A) and the first joint pipe portion (B).
a), and a curved second rectifying surface (13b) for rectifying the first rectifying member (12a) and the first joint pipe (B) and the new water pipe (C). It is formed in a shape in which the second rectifying member (12b) is connected in series, and each rectifying surface (13
(a) and (13b) are connected to each other with a phase difference of about 90 ° around the axis (X ₁ ) of the first joint pipe portion (B).

A rubber first seal member (14a) pressed against the inner peripheral surface of the through hole (a) on the outer periphery of the rectifying member (12), and a rubber pressed against the inner peripheral surface of the existing water pipe (A). And a third rubber sealing material (14b) pressed around the communication connection port (3) of the inner peripheral surface of the first joint pipe portion (B).
c) and a fourth rubber sealing material (14) pressed against the other end side opening (b ₂ ) of the inner peripheral surface of the first joint pipe portion (B).
d) is provided, and the first sealing material (14a) and the second sealing material (14b) seal one of the flow paths of the existing water pipe (A) facing the through hole (a). ) Is configured.

Next, using the pipe joint member configured as described above,
A buried pipe connection method for connecting an existing water pipe (A) and a new water pipe (C) in a state of uninterrupted water supply through a first joint pipe section (B) and changing the flow path of tap water will be sequentially described. I do.

I. As shown in FIG. 1, a pit (P) surrounding an existing water pipe (A) buried underground is excavated, and a joint case (E) is externally fitted to the existing water pipe (A). With the second joint pipe (4) connected to the first joint pipe (B) facing downward, the axis (X ₁ ) of the first joint pipe (B) is approximately vertical.
The communication connection port (3) is fixed at a 45 ° inclined position with the communication connection port (3) facing downward, and the newly installed water supply is connected to the second joint pipe (4) via a flange joint (10) provided at its free end. Connect pipe (C) and connect gate valve (F) to gate valve (5)
Is connected.

The new water pipe (C) is previously laid almost horizontally along a predetermined route.

B. Next, as shown in FIG. 1, a case (G ₁ ) for piercing is attached to the gate valve (F).

Then, the cutter (7) is lowered to the cutting work position through the gate valve (F) and the first joint pipe portion (B) to form the through hole (a) in the existing water pipe (A), and then the case for drilling is formed. Pull up into (G ₁ ), close the gate valve (F), and remove the perforating case (G ₁ ) from the gate valve (F).

Incidentally, cut pieces after bored a through hole (a) in the new water pipe (A) is pulled into the drilling casing (G ₁₎ with a cutter (7).

C. Next, as shown in FIG. 2, a lid installation case (G ₂ )
To the gate valve (F).

D. Next, the gate valve (F) is opened, and as shown in FIG.
The lid (9) is lowered to insert the rectifying member (12) into the first joint pipe (B) so that the first rectifying surface (13a) faces the axis of the existing water pipe (A). Rectifying surface (13b) is second
With the lid (9) facing the axial direction of the joint pipe (4),
Bolt (1) that has been screwed into the connection flange (5) in advance.
Temporarily fix to connection flange (5) in 5).

With this temporary fixing, the first sealing material (14a) is inserted into the through hole (a).
The second sealing material (14b) is on the inner peripheral surface of the existing water pipe (A).
On the inner peripheral surface of the first joint pipe portion (B) around the communication connection port (3) on the inner peripheral surface of the first joint pipe portion (B), and the fourth seal material (14d) on the inner peripheral surface of the first joint pipe portion (B). ) The inner peripheral surface is pressed around the other end opening (b ₂ ).

E. Next, the fixing of the lid installation case (G ₂ ) to the gate valve (F) is released, and the lid installation case (G ₂ ) is lifted along the operation shaft (9a). ) And the lid (9) are disconnected to release the lid installation case (G ₂ ), and
The gate valve (F) is detached from the connection flange (5), and the lid (9) is permanently fixed to the connection flange (5).

F. Next, as shown in FIG. 3, the existing water pipe (A) closed at the sealing surface (14) is cut off to form an opening (11).
Is formed, and a lid (16) for closing the opening (11) is mounted and fixed to the joint case (E) via the connecting member (17).

According to the above-mentioned procedures (a) to (d), the existing water pipe (A) and the new water pipe (C) are connected via the first joint pipe section (B), and the flow path of the tap water is changed. 4), the new water pipe (C) is buried at a predetermined depth (h) as shown in FIG.

[Another embodiment] The present invention is not limited to a water pipe, and may be a sewer pipe or another buried pipe for transporting a liquid or gas.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

The drawings show an embodiment of the pipe joint structure of a buried pipe according to the present invention, and FIGS. 1 and 4 are cross-sectional views of essential parts, and FIGS. 2 and 3 are from the direction of arrows YY in FIG. FIG. 5 is a perspective view of a main part. FIG. 6 is an explanatory view of a conventional example, and FIG.
FIG. 8 is an explanatory view of a comparative example. (4)... The second joint pipe part, (5)... The connecting part, (7).
... perforating device, (9) ... lid, (10) ... connecting part, (a)
Through hole, (A) 1st buried pipe (existing water pipe), (B)
... First joint pipe part, (C) Second buried pipe (new water pipe), (E) Joint case, (e) Split case part, (F) Gate valve.

Continuation of the front page (56) References JP-A-3-149493 (JP, A) JP-A-62-17493 (JP, A) JP-A-61-31609 (JP, U) JP-A-52-80188 (JP, A) , U) Japanese Utility Model 2-82409 (JP, U) Japanese Utility Model Application 57-73488 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) F16L 41/06 F16L 55/00

Claims (2)

(57) [Claims] 1. A through hole (a) formed in a peripheral wall of a horizontal pipe portion of a first buried pipe (A), with respect to a pipe axis (X ₂ ) of the first buried pipe (A). A pipe joint structure for communicating and connecting the horizontal pipe end of the second buried pipe (C) from a direction intersecting with the first buried pipe (A), wherein the outer pipe is fixed to the horizontal pipe of the first buried pipe (A) in a liquid-tight or air-tight state. A first joint pipe part (B) provided with a communication flow path serving as a movement passage of a drilling device (7) for forming the through hole (a) is provided vertically on the upper part of the joint case (E). The first joint pipe section (B) is provided at an intermediate portion of the first joint pipe section (B) in the pipe axis (X ₁ ) direction in an upwardly inclined posture that intersects both the horizontal and horizontal directions. A inclined flow path communicating from below with the communication flow path in a posture orthogonal to the pipe axis (X ₁ ) of the pipe, and a horizontal flow path communicating from the horizontal direction to the inclined flow path. A two-joint pipe part (4) is continuously provided, and a horizontal pipe end of the second buried pipe (C) is connected to a distal end of the second joint pipe part (4) in a horizontal direction. (10) is formed, and a lid (9) or a first joint for closing an opening of the first joint tube (B) is provided at an upper end of the first joint tube (B). A connecting part (5) for fixedly connecting a gate valve (F) for opening and closing the opening of the pipe part (B)
The pipe joint structure of the buried pipe in which is formed. 2. A split case portion (e) in which the joint case (E) is divided into a plurality in the circumferential direction of the first buried pipe (A).
The pipe joint structure for a buried pipe according to claim 1, comprising: