JPH0724712A - Method and device for grinding internal surface of existing tube - Google Patents

Abstract

PURPOSE:To increase the grinding efficiency by inserting at least a pair of grinders coupled longitudinally through a universal joint which are rotated in circumferential direction of a tube into a tube from the end of an opening on one end, and grinding a specified area of a step difference part in the longitudinal direction by the reciprocating motion of the pair of grinders on the step difference part. CONSTITUTION:A grinding device 4 is inserted into an existing tube 1 from the end of an opening on a manhole side, and a specified area of a step difference part 3 in the longitudinal direction is ground by the reciprocating movement of the grinding device 4. The grinding device 4 is structured by arranging connectedly a front end guide 5, a front grinder 6, a front universal joint 7, a rear universal joint 8, a rear end grinder 9, a hydraulic motor 10, and a rear guide 12 in order from the top end through a rotating shaft and a connecting frame. Also a cleaning brush 22 is arranged detachably at the front of the front guide 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention corrects a pipeline by grounding an existing pipe having a projection or a step in a pipeline laid underground, by grinding the projection or the step from the inner surface of the pipe. At the same time, the present invention relates to a grinding method and an apparatus for cleaning an inner surface of an existing pipe so as to clean the inner surface thereof.

[0002]

2. Description of the Related Art Conventionally, a communication line laid underground
In a power line, etc., due to aging, a projection may be generated on the inner surface of the pipe, or a step may be created at the pipe joint part, so that the communication cable, the power cable, etc. cannot be inserted.
Often, existing pipelines laid underground are out of service. There are cases where it is sufficient to simply remove the protrusions and stepped portions as described above, and cases where the portions are filled with mortar, resin, etc. and then molded, but in the latter, the construction method has already been established. is doing.

As a method for removing foreign matters such as the above-mentioned projections and stepped portions, conventionally, a foreign matter is removed by spraying a water jet (high pressure jet water), a rotating wire brush, a grinder, a bite, etc. There are known ones in which a foreign substance is mechanically ground to secure a predetermined inner diameter of the pipe, and those in which a conduit is mechanically expanded to secure a predetermined inner diameter of the pipe.

[0004]

However, each of the conventional methods for removing foreign matter in a pipe has the following problems. It is often inadequate in capacity and does not perform necessary grinding (foreign matter removal, expansion, etc.). In this case, it is not possible to satisfy the conditions such as passing through the mandrel. If the grinding machine itself cannot pass through the steps or bends of the pipeline due to the large size of the machine or poor adaptability, and if the grinding capacity is large,
At the stepped portion or the bent portion, the inner surface of the pipe itself is often ground instead of grinding the necessary portion, and it can often be used only in the straight pipe portion. The device itself becomes large and the work efficiency decreases. The present invention is intended to solve the above problems.

[0005]

In order to achieve the above object, the present invention provides (1) a step portion from an inner surface of an existing pipe in which a step is generated in a pipeline laid underground. In the method of grinding the inner surface of the pipe in which the pipe is ground to correct the pipe, at least two front and rear grinding grinders that rotate in the pipe circumferential direction are connected by a universal joint and introduced from one open end of the pipe. , The two grinders are reciprocally moved with respect to the step portion so that the step portion is ground back and forth within a predetermined range. (2) The two grinders are rotated together with the grinder. Attached a brush for cleaning the step and cleaning the inner surface of the pipe at the same time.

(3) In a grinding device for an inner surface of a pipe, in which a step is ground to correct the pipe from the inner surface of the existing pipe in which a step is formed in a pipe laid underground , A front guide and a rear guide that are in elastic sliding contact with the inner surface of the pipe from one open end of the pipe through a feeding rod that can reciprocate along the pipe, and an outer diameter that is slightly smaller than the pipe diameter. The front and rear grinders that rotate in the same direction, the universal joint that connects the front and rear grinders, and the prime mover that rotates the front and rear grinders are introduced. The stepped portion is ground over a predetermined range by reciprocating with respect to the stepped portion. (4) The number of the universal joints is two and the distance between the front grinder and the rear grinder is adjusted. (5) The distance between the front guide and the front grinder, and the distance between the rear guide and the rear grinder can be adjusted, respectively. (6) The front and rear grinders can be rotated on the front side of the grinding machine. And a cleaning brush is provided.

[0007]

With the above means and structure, the grinding method and apparatus for the inner surface of the existing pipe of the present invention perform the following operations. At least two front and rear grinding grinders, which rotate in the circumferential direction of the pipe, are introduced from one open end of the pipe line by connecting them with a universal joint, and the two grinders are reciprocally moved with respect to the step portion, thereby providing a step. Since the portion is ground back and forth within a predetermined range, the step portion is efficiently ground to secure a predetermined pipe inner diameter dimension. Since a cleaning brush that rotates together with the grinder is attached to the two grinders to grind the stepped portion and clean the inner surface of the pipe at the same time, the grinding of the stepped portion and the inner surface of the pipe are efficiently performed. .

[0008] A front and rear guides, a front and rear grinder, and a universal joint that connects the front and rear grinders from one open end of the pipeline through a feeding rod that can reciprocate along the pipeline. Introducing a grinding machine consisting of a prime mover that rotates the front and rear grinders, and moving the front and rear grinders back and forth with respect to the stepped portion grinds the stepped portion over a predetermined range. Efficiently grind only the part. Further, the grinding work can be performed from one open end of the conduit. Since the number of universal joints is two and the distance between the front grinder and the rear grinder can be adjusted, the front grinder and the rear grinder separately move with respect to the step part to grind the step part. Since the distance between the front guide and the front grinder and the distance between the rear guide and the rear grinder can be adjusted respectively, both the grinders grind the stepped portion according to the distance between the both guides. Since the grinding device is provided with the cleaning brush that rotates together with the front and rear grinders, the grinding and cleaning operations can be performed simultaneously.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. 1 and 2, reference numeral 1 is an existing pipe such as a communication pipe or a power pipe buried underground, and the existing pipe 1 is a manhole 2 provided on a road.
It is laid between two (one is not shown), and when inserting a communication cable, an electric power cable, etc. into the existing pipe 1, as a result of previously inspecting the inside of the pipe with a mandrel, a television camera, etc., the step portion 3 (or (Bends, bump-shaped protrusions, etc.)
Is detected. Then, the stepped portion 3 (or a bent portion or a bump-shaped protrusion) is ground by the reciprocating movement of the grinding device 4 inserted from one open end on the side of the manhole 2, and the communication cable, the power cable or the like is inserted. Make sure that it does not interfere with the operation.

The grinding device 4 includes a front guide 5, a front grinder 6, a front universal joint 7, a rear universal joint 8, a rear grinder 9, and a hydraulic motor (motor) 1 in order from the beginning.
0, the rear guide 12, etc. are arranged via the rotary shaft 11 and the connecting frame 13. A cleaning brush 22 is detachably arranged on the front side of the front guide 5 at the head of the grinding device 4.

The front guide 5 and the rear guide 12 are
Four elastic slidable contact bodies are provided at equal intervals from the body portion in the radial direction so that the slidable slidable contact bodies can be moved while always in sliding contact with the inner peripheral surface of the existing pipe 1. The front grinder 6 and the rear grinder 9 have an outer diameter slightly smaller than the diameter of the existing pipe 1, are projected forward from the hydraulic motor 10, and are rotatably supported by the rear end of the front guide 5. The rotating shaft 11 rotates in the circumferential direction of the pipe. The front grinder 6 and the rear grinder 9 are connected by a front universal joint 7 and a rear universal joint 8.
The distance L1 between the rear grinder 9 and the rear grinder 9, the distance L2 between the front guide 5 and the front grinder 6, and the distance L3 between the rear grinder 9 and the rear guide 12 are adjustable.

The rear part of the rear guide 12 has a connecting frame 13
Is connected to the support member 14 via the, and the feed rod 15 and the tip of the hydraulic hose 16 are connected to the support member 14. The delivery rod 15 is a delivery rod reel 19 installed outside the manhole 2 via a guide roll 17.
The grinding device 4 is reciprocally moved relative to the existing pipe 1. Further, the hydraulic hose 16 is fed and rewound by a hydraulic hose reel 20 installed outside the manhole 2 via a guide roll 18, and pressure oil is supplied from a hydraulic pump 21 connected to the hydraulic hose reel 20. It is like this.

In the structure of the grinding device for the inner surface of the existing pipe, the grinding device 4 may be moved back and forth from the openings at both ends of the existing pipe 1 by wires, and the front and rear guides 5 and 12 may be moved. The sizes and shapes of the front and rear grinders 6 and 9 may be changed, and the hydraulic motor 10 may be replaced with an electric motor or an air motor. Further, the number and arrangement position of the cleaning brushes 22 may be changed.

Next, the operation of the grinding device 4 of the embodiment constructed as described above will be described. First, FIG. 1 and FIG.
As shown in FIG. 2, the grinding device 4 is introduced together with the hydraulic hose 16 from the opening portion of the existing pipe 1 opened in the manhole 2 through the feeding rod 15 fed from the feeding rod reel 19 to advance the inside of the pipe, and the hydraulic motor The front grinder 6, the rear grinder 9, and the cleaning brush 22 are rotated by 10. Then, the cleaning brush 22 cleans rust and the like on the inner surface of the pipe, and the front grinder 6 and the rear grinder 9 grind and remove any protrusions on the inner surface of the pipe. At this time, the front grinder 6 and the rear grinder 9 are supported by the front guide 5 and the rear guide 12 in the substantially central portion of the pipe, and have an outer diameter slightly smaller than the inner diameter of the pipe. The surface is not ground.

Then, as shown in FIG. 3A, when the cleaning brush 22 reaches the step 3 and is further advanced,
As shown in FIG. 3B, the cleaning brush 22 and the front guide 5 pass through the step portion 3, and the front grinder 6 bends the front universal joint 7 and the rear universal joint 8 along with the front guide 5. While passing through, the upper and lower corners of the step portion 3 are ground by passing through the step portion 3. Even if the rear grinder 9 reaches the stepped portion 3 as shown in FIG.
Since it is supported by 2, the upper surface of the step portion 3 is advanced while being ground, and when the rear guide 12 reaches the step portion 3 as shown in FIG. 3D, the step portion 3 is cut by the rear grinder 9. Ends and the forward process ends.

Next, the grinding device 4 is pulled back by the feeding rod 15 to perform the returning step shown in FIGS. 4 (a) and 4 (b). At this time, the reverse step is performed, and the rear grinder 9 is stepped. Almost no cutting is performed on the lower surface side of 3, and cutting is mainly performed by the front grinder 6. The cutting length of the step portion 3 in the forward process and the backward process is the distance L1 between the front grinder 6 and the rear grinder 9 and the front guide 5.
The distance L2 between the front grinder 6 and the rear grinder 9, and the distance L3 between the rear grinder 9 and the rear guide 12 are adjusted.

In this way, as shown in FIG. 5, the stepped portion 3 has its upper and lower portions indicated by C cut along the front and rear predetermined intervals so that a communication cable, a power cable or the like can be smoothly inserted. Become. There are cases where it is sufficient for a communication cable, a power cable, etc. to pass through the pipe, cases where the cut portion is reinforced with resin or mortar after cutting, and cases where the entire inner surface of the pipe is lined with resin.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

[0019]

As described above, according to the grinding method and apparatus for the inner surface of the existing pipe of the present invention, the following effects can be obtained. At least two front and rear grinding grinders, which rotate in the circumferential direction of the pipe, are introduced from one open end of the pipe line by connecting them with a universal joint, and the two grinders are reciprocally moved with respect to the step portion, thereby providing a step. Since the portion is ground back and forth within a predetermined range, the stepped portion can be efficiently ground to secure a predetermined inner diameter of the pipe, and a communication cable, a power cable or the like can be easily inserted. A cleaning brush that rotates together with the grinder is attached to the two grinders to grind the stepped portion and clean the inner surface of the pipe at the same time. Therefore, it is possible to efficiently grind the stepped portion and clean the inner surface of the pipe. Can be carried out.

From the open end of one end of the pipe, through a feeding rod that can reciprocate along the pipe, a front guide and a rear guide that are in elastic sliding contact with the inner surface of the pipe, and an outer diameter that is slightly smaller than the pipe diameter. A front grinding machine and a rear grinding machine that rotate in the pipe circumferential direction, a universal joint that connects the front grinding machine and the rear grinding machine, and a prime mover that rotates the front grinding machine and the rear grinding machine are introduced. Since the grinder of is moved back and forth with respect to the step portion, the step portion is ground over a predetermined range.
It is possible to efficiently and surely grind only a necessary portion such as a stepped portion. Further, the grinding work can be performed only from one open end of the conduit.

Since the number of universal joints is two and the distance between the front grinder and the rear grinder can be adjusted, the front grinder and the rear grinder move separately with respect to the step, depending on the distance between the two grinders. It is possible to grind the stepped portion with a certain length. Since the distance between the front guide and the front grinder and the distance between the rear guide and the rear grinder can be adjusted, the two grinders can grind the stepped portion in accordance with the distance between the both guides. Since the grinding device is provided with the cleaning brush that rotates together with the front and rear grinders, it is possible to carry out the cleaning operation and the grinding operation, and the grinding operation and the cleaning operation at the same time.

[Brief description of drawings]

FIG. 1 is a partial side sectional view showing an embodiment according to the present invention.

FIG. 2 is a side sectional view of a grinding device.

3 (a) to 3 (d) are side sectional views showing a forward step of a grinding operation by a grinding device.

4A and 4B are side cross-sectional views showing a returning step of the grinding operation by the grinding device.

FIG. 5 is a side sectional view showing a state of being ground by a grinding device.

[Description of symbols] 1 existing pipe 2 manhole 3 step 4 cutting device 5 front guide 6 front grinder 7 front universal joint 8 rear universal joint 9 rear grinder 10 hydraulic motor (motor) 11 rotary shaft 12 rear guide 13 connection Frame 14 Supporting member 15 Feeding rod 16 Hydraulic hose 17, 18 Guide roll 19 Feeding rod reel 20 Hydraulic hose reel 21 Hydraulic pump 22 Cleaning brush L1 Distance between front grinder and rear grinder L2
Distance between front guide and front grinder L3 Distance between rear grinder and rear guide C Cutting part

Claims (6)

[Claims] 1. A method for grinding an inner surface of a pipe, wherein a step is ground to correct the pipe from an inner surface of an existing pipe having a step in a pipe laid underground. At least two front and rear grinding grinders, which rotate in the circumferential direction of the pipe, are introduced from one open end of the pipe line by connecting them with a universal joint, and the two grinders are reciprocally moved with respect to the step portion, thereby providing a step. A method for grinding an inner surface of an existing pipe, characterized in that a portion is ground back and forth within a predetermined range. 2. The two grinders are provided with a cleaning brush that rotates together with the grinders, so that grinding of the stepped portion and cleaning of the inner surface of the pipe are performed at the same time. Grinding method for the inner surface of the existing pipe. 3. A grinding device for an inner surface of a pipe, which is configured to grind a stepped portion from an inner surface of an existing pipe in which a step is formed in a pipeline laid underground to correct the pipeline. The front and rear guides that are in sliding contact with the inner surface of the pipe through the feeding rod that can reciprocate along the pipe from the open end of the pipe, and the outer diameter that is slightly smaller than the diameter of the pipe. Front grinder and rear grinder that rotate to
Introducing a grinding device consisting of a universal joint that connects the front grinder and the rear grinder, and a prime mover that rotates the front and rear grinders. An apparatus for grinding an inner surface of an existing pipe, wherein the part is ground over a predetermined range. 4. The apparatus for grinding an inner surface of an existing pipe according to claim 3, wherein the number of the universal joints is two and the distance between the front grinder and the rear grinder can be adjusted. 5. The grinding device for the inner surface of an existing pipe according to claim 3, wherein the intervals between the front guide and the front grinder and between the rear guide and the rear grinder can be adjusted. 6. The grinding device for an inner surface of an existing pipe according to claim 3, 4 or 5, wherein said grinding device is provided with a cleaning brush which rotates together with the front and rear grinders.