JPH0543358Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a repair device for an existing pipe joint.

Conventional technology and its problems In existing pipes such as gas pipes buried underground, the seal part of the pipe joint usually consists of a mortar-filled part on the outside of the joint and a fibrous filling part on the inside. It consists of When the inner fibrous filling part of the seal part ages, it dries and shrinks, reducing or losing its sealing function and requiring repair.

Conventionally, as a repair device for such pipe joints, a rubber packer part installed on a construction machine that is towed inside an existing pipe is inflated by remote control, sealing the pipe joint part, and then inserting it into the fibrous filling part inside the pipe joint part. A structure has been proposed in which a sealant is injected to restore the wet state to the initial state of construction. However, the conventional structure had a problem in that when the packer part was expanded when repairing the joint part, the inside of the pipe became degassed, making it impossible to supply gas to customers during the repair work.

The present invention was made with the aim of eliminating these conventional problems.

Means for Solving the Problems The present invention provides a main body of a construction machine that is movable in the axial direction of the existing pipe, and a pair of front and rear parts concentric with the main body, which are moved toward and away from each other in the axial direction of the pipe by remote control. A movable cylinder is provided, and a frame body concentric with the main body is assembled into a cylindrical shape from a plurality of spring bars attached between opposite ends of the movable cylinder, and the frame body is arranged in a radial direction of the tube. When the cylinders are in the separated position, the cylinders are in a contracted state, and when they are in the close position, they are in an expanded state. A pipe joint sealing packer part that expands and contracts in the radial direction of the pipe is provided, and the packer part is free from the inner surface of the pipe when the skeleton body is in the contracted state, and on the other hand, when it is in the expanded state, it is attached to the inner surface of the pipe through the skeleton body. The present invention relates to an apparatus for repairing an existing pipe joint, which is configured to be crimped, and the packer part is provided with an injection port for injecting a sealant into the pipe joint.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a construction machine equipped with grounding parts 2, 2 at both front and rear ends, and the construction machine 1 is moved inside the pipe by pulling a rope 3 while installed inside the pipe a. It is preferable that the height of the construction machine 1 is as low as possible, considering the influence on the gas flow in the pipe when it is installed in the pipe. There is.

A pair of front and rear movable cylinders 4, 4 are provided at both ends of the main body 1a of the construction machine 1, and are concentric with the main body 1a, and are movable cylinders 4, 4, which are brought together and separated under remote control using fluid control. via a ground-based fluid control unit (not shown).

A frame body 6 assembled into a cylindrical shape from a plurality of parallel and equally spaced spring bars 6a is provided between the opposing ends of the cylinders 4, 4 so as to be concentric with the main body portion 1a. There is. Above spring bar 6
Both ends of a are pivotally connected to the cylinder 4 so as to be rotatable in the radial direction of the tube, and are provided with a gentle curve so that they are always curved outward.
The frame body 6 normally maintains a contracted state as shown in FIG. 1, and the cylinders 4, 4 maintain a separated state. From this state, when the cylinders 4, 4 are moved in the direction of bringing them together, the spring rod 6a curves outward as it moves, and the frame body 6 is expanded in the radial direction of the tube, as shown in FIG. As shown in Figure 2, the center part is crimped onto the inner surface of the tube a.

A ring plate 7 that can be expanded and contracted in the radial direction of the tube is provided at the center of the frame body 6 as required.

As shown in FIGS. 3 and 4, the ring plate 7 is composed of a large number of segments 7a connected sequentially via hinge portions 8a, 8a' in the circumferential direction of the tube. The axis of the hinge portion 8a extends from the spring bar 6a and from the other hinge portion 8 between the hinge portions 8a, 8a.
The a' axes are each constituted by a short axis 9.
For example, the ring plate 7 has 36 segments 7a.
18 spring rods 6a and 18 short shafts 9 are used. That is, in this case, the frame body 6 includes 18 spring rods 6a arranged at 20° intervals.
It is assembled from. Such a ring plate 7 is provided to enable regular expansion and contraction of the packer portion described below, and may be omitted in some cases. When the ring plate 7 is expanded as shown in FIG.
a, 8a' open approximately 180° to have a maximum outer diameter, approximately equal to the inner diameter of tube a, and when reduced as shown in FIG. 5, each hinge portion 8a, 8
a' closes, producing many folds and reaching the minimum outer diameter.
In this case, the short axis 9 is located at the peak of the pleat, and the spring bar 6a is located at the trough. Although the figure shows a case in which a pair of front and rear ring plates 7 having a relatively narrow width are provided with an interval between them, one ring plate 7 having a relatively wide width may be provided.

A cylindrical packer part 10 that can be expanded and contracted in the radial direction of the tube is provided at the center of the frame body 6 so as to follow the expansion and contraction movement of the frame body 6.

The packer portion 10 includes the ring plates 7, 7.
A cylindrical bottom seal portion 10a installed across the
The bottom seal part 10a is provided with hollow annular side seal parts 10b, 10b attached to the front and rear ends thereof so as to be one step higher than the bottom seal part 10a, and the side seal parts 10b, 10b are normally maintains a flat shape, but when supplied with air from the hose 11, it expands and becomes bulky. A downwardly opened inlet 10c is provided at the lower end of the packer section 10, and the inlet 10c is connected via a liquid hose 12 to a ground-based liquid supply unit (not shown).

The packer part 10 follows the expansion and contraction movement of the frame body 6, and when the frame body 6 is in the contracted state, it is folded so that a large number of folds are formed through the ring plate 7, as shown in FIG. When the frame body 6 is in the expanded state, the folds are stretched through the ring plate 7 to have the maximum outer diameter and are crimped onto the inner surface of the tube a, as shown in FIG. Ru.

As shown in FIG. 1, when the construction machine 1 is moved within the pipe, the movable cylinders 4, 4 are moved to the separated positions at both ends of the main body 1a under the spring pressure of the frame body 6, and The frame body 6, the ring plate 7, and the packer portion 10 all maintain a reduced state. The construction machine 1 is then freed from the inside of the pipe a, and is moved within the pipe by the usual pulling operation using the rope 3, and is aligned with the joint part b. The construction machine 1 can be equipped with a proximity sensor 13 for alignment, and a high frequency oscillation type proximity switch, a magnetic proximity switch, etc. are suitable as the proximity sensor 13.

After finishing the alignment of the construction machine 1 and the joint part b, the movable cylinders 4, 4 control the fluid and move the main body part 1a.
are simultaneously advanced toward the center in the length direction and brought together. As the cylinders 4, 4 come together, the spring rods 6a... are curved and protruded outward against the retained springs, and the frame body 6, together with the ring plate 7 and the packer part 10 that follow this, are moved into the tube. Expanded radially. Due to this expansion, the packer part 10 is crimped onto the inner surface of the pipe a as shown in FIG. 2, and along the inner peripheral surface of the joint part b of the pipe a,
Annular gap c sealed by sealer part 10a
is formed. Packer portion 1 is placed in this annular gap c.
By injecting and filling the sealant from the injection port 10c of No. 0, the purpose of repairing the joint part b can be achieved as usual. The frame body 6 that presses the packer part 10 against the inner surface of the pipe a has an assembly structure of spring bars 6a, and has a gap between each spring bar 6a for gas circulation in the pipe, so that such a joint part Repair (b) can be carried out while maintaining the gas flow state.

After repairing the joint part b, when the movable cylinders 4, 4 are released from the air pressure, the frame body 6 automatically returns to its original contracted state by the retaining spring, and at the same time, the ring plate 7 and the packer part 10
follows this contraction movement of the frame body 6 and is folded into a contracted state, and the cylinders 4, 4 are further separated by the spring force of the frame body 6 and return to the positions at both ends of the main body portion 1a for the next operation. Prepare for. In the illustrated embodiment, a case has been described in which the packer part 10 is provided on the frame body 6 via the ring plate 7, but the packer part 10 may be provided directly on the frame body 6. When provided directly, the packer portion 10 is directly attached and fixed to each of the spring bars 6a constituting the frame body 6 at the bottom seal portion 10a.

Effects According to the device of the present invention, the expansion and contraction of the patch car part 10 is
A frame body 6 assembled from a large number of spring rods 6a
This is done by expanding and contracting the pipe, so that even when the packer part 10 is expanded, there is a gap for the flow of gas inside the pipe, and the pipe joint part can be repaired while maintaining the active pipe state. It has characteristics.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention and one usage situation, when it is being moved inside a pipe; Fig. 2 is a longitudinal sectional view during repair; Fig. 3 is a partially developed view of the ring plate; FIG. 4 is a side view schematically showing the state of the ring plate and packer portion when they are expanded, and FIG. 5 is a side view schematically showing the state when they are contracted. In the figure, 1 is a construction machine, 2 is a grounding part, 3 is a rope, 4 is a movable cylinder, 5a, 5b are air hoses, 6 is a frame body, 6a is a spring bar, 7 is a ring plate, 8a, 8a' Hinge part, 9 is short axis, 10
is the police car club.

Claims (1)

[Scope of utility model registration request] A main body of a construction machine that is movable in the axial direction of the existing pipe is provided with a pair of front and rear movable cylinders concentric with the main body, which are moved toward and away from each other in the axial direction of the pipe by remote control, and opposite ends of the movable cylinders. A frame body concentric with the main body part is provided, which is assembled into a cylindrical shape from a plurality of spring bars attached between them,
The frame body is expandable and contractible in the radial direction of the tube, and maintains a contracted state when the cylinders are in the separated position and an expanded state when they are in the close position, and the frame body is placed on the frame body. A pipe fitting sealing part is provided that expands and contracts in the pipe radial direction following the expansion and contraction movements of the pipe joint, and the packer part is free from the inner surface of the pipe when the framework body is in the contracted state, and on the other hand, when the framework body is in the expanded state, the packer part is free from the inner surface of the pipe. 1. A repair device for an existing pipe joint, which is configured to be crimped onto the inner surface of a pipe through the body, and the packer part is provided with an injection port for injecting a sealant into the pipe joint.