JP2003106476A - Pipe connecting device in earthquake-resistant pipe restoration method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe capable of sufficiently retaining a water conveyance capacity and having earthquake resistance. SOLUTION: A material formed by winding a steel plate into a rolled state by an elastic deformation bending and binding it using strings is carried and released into an existing pipe body 10, its diameter is enlarged and brought into an almost close contact with the inside surface of the existing pipe body, and an end side along the pipe axial direction is welded so that a reinforcing pipe 20 having the same length with the existing pipe body is formed. This one and the existing pipe body are integrated together to be formed into a restored pipe 30, an annular body 31 composed of an elastic material is fixed to the insides of the mutual end parts of the restored pipes, the restored pipes are flexibly, watertightly, and stretchably connected to each other, the annular body receives an equal expanding action by fastening of the enlarged diameter by a fixed band 40 to make the material width thin, and the fixed band makes the projection of the annular body minimum and makes the resistance of the water flow minimum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting device in a seismic resistant pipe rehabilitation method in which a new reinforcing pipe is mounted in an existing pipe for the purpose of rehabilitating an existing pipe.

[0002]

2. Description of the Related Art As a method of rehabilitating a pipeline buried in the ground, a new reinforcing pipe is installed, but the sectional area of the newly formed pipeline is significantly reduced depending on the construction method and material. It will be less. For example, in the conventional pipe-in-pipe construction method, because the force at the time of expanding the diameter of the rolled steel pipe does not adversely affect the existing pipe body, and for the purpose of complementing the outer surface coating accompanying the steel pipe welding, A method has been adopted in which a required gap is provided between the existing pipe body and the reinforcing pipe, and cement milk or the like is injected into the gap. Therefore, the rehabilitated pipe inevitably had a reduced cross-sectional area of water supply, and the planned amount of water stopped flowing.

Further, the conventional method of rehabilitating a pipeline is often not effective for an aged pipeline having a joint. This is because the aged pipe itself is an inflexible PC pipe (concrete pipe with prestress introduced), and even if the new reinforcing pipe is a flexible pipe, the ends of adjacent reinforcing pipes are welded together. In the case of an earthquake or uneven settlement of the ground,
This is because bending, pulling, or concentration of compressive stress occurs in the new reinforcing pipe, which causes a defect of bending at the joint position.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and the problem is that the degree of reduction of the cross-sectional area of the water supply planned for the existing pipeline is small and the original water supply is reduced. An object of the present invention is to provide a pipe connecting device in a seismic resistant pipe rehabilitation method, which is capable of substantially retaining its capacity and has earthquake resistance.

[0005]

In order to solve the above-mentioned problems, the present invention provides a reinforcing pipe in which a steel plate is rolled into a roll by elastic deformation bending and is bundled by using a string so that After loading, the bundle is unwound, and the diameter is expanded so that it almost comes into close contact with the inner surface of the existing pipe, but by welding the edges along the pipe axis direction, it is cylindrical and has the same length as one existing pipe. Reinforcement pipe is formed, whereby a reinforcement pipe and an existing pipe body form an integral rehabilitation pipe, and an annular body made of an elastic material is fixed to the inner surface in order to connect the ends of the rehabilitation pipe. Thus, the rehabilitation pipes are connected flexibly, watertightly, and expandably, and the annular body is subjected to a uniform expansion action by the expansion band tightening of the fixing band, which reduces the material thickness of the annular body, And a fixing band for fixing the annular body to the inner surface of the pipe , In which took measures that the resistance of the water flow to minimize the protrusion of the annular body and very small.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The seismic resistant pipe rehabilitation method according to the present invention is carried out for the purpose of repairing and rehabilitating an existing pipeline buried in the ground without excavating the surrounding area. The target buried pipes are so-called PC pipes that have deteriorated over the years after construction, and the materials and tools for the reinforcing pipes necessary for restoration without digging up are manholes or other carry-in ports. It can be carried into the pipe from the inside. The reinforced pipe is preferably made of, for example, SUS304 steel plate as a means capable of withstanding internal water pressure, excellent in workability and durability, and satisfying the conditions for keeping the current water supply capacity reduction to a minimum.

When a SUS304 steel plate is elastically deformed and bent into a drum shape having a diameter of, for example, 50 cm, and is bound with a string or the like, a take-in pipe which can be carried into a buried pipe body from a manhole is manufactured. Rope, wire,
Including chains, belts, etc. After the elastically deformed rolled-in pipe is carried into the pipe body, the diameter is expanded so as to follow the surface of the existing pipe body.
This expanded diameter is elastically deformed by itself by releasing the binding,
All or part of the action of restoration, and thereafter
An arc length of about 90 degrees is connected from both ends of the fixing band by bracing, and jacks are inserted at both ends of the fixing band to expand the diameter so that they are almost in close contact with the inner surface of the pipe. This expansion method is referred to as a brace diameter expansion method in the present invention. Part of the action means that even if some plastic deformation occurs, elastic deformation can still be expected.

[0008] A cylindrical reinforcing pipe is formed by welding the end sides of the pipe whose diameter has been expanded as described above along the pipe axial direction. This reinforced pipe is manufactured under the condition that the material is strongly pressed against the inner surface of the pipe by the above-mentioned brace expansion method, etc., and it is in close contact with the inner surface of the pipe, that is, in close contact or close contact. Since there is no space between the pipe body and the reinforcing pipe, the sectional area of the pipe line reinforced and refurbished by the method of the present invention is reduced only by the thickness of the reinforcing pipe material. Furthermore, it can be considered that the ring-shaped body is made thin, both ends thereof are formed in bellmouth shape, and the water flow resistance is minimized by the SUS304 steel plate, so that the substantial water feeding capacity is maintained as it is.

The length of the reinforcing pipe is determined by the scale of the carry-in port of the existing pipeline, and when the carry-in port is small in size such as a manhole, the number of existing pipe bodies is used as the constituent material of the reinforcing pipe. It is assumed that the reinforcing short pipe having a length of one-half is connected and formed, which facilitates the carry-in and the work in the pipe. In this case, the ends of the first and last reinforcing short pipes in one pipe body are provided so as to coincide with the front and rear ends of the pipe body. After fixing the first of several reinforced short pipes in the pipe, form the next reinforced short pipe on the end of the reinforced short pipe, and weld the overlapped ends. By repeating this, several reinforcing short pipes are integrated by welding to form a reinforcing pipe. The reinforcing pipe has the same length as the existing pipe, and the existing pipe is structurally responsible for the external pressure, and the reinforcing pipe is responsible for the internal pressure to form an integral rehabilitation pipe.

Therefore, when the rehabilitation pipe is formed, the existing pipe line becomes a row of reinforced pipes, and the connection between the individual pipes remains unreinforced. Therefore, in order to connect the ends of the rehabilitation pipes, an annular body made of an elastic material is fixed to the inner surface over both rehabilitation pipes. As a result, the rehabilitating pipes are connected flexibly, watertightly and expandably so that bending stress in the pipe axial direction does not reach the reinforcing pipes.

For the purpose of reducing watertightness, earthquake resistance and water flow resistance in the rehabilitating pipeline, the annular body is expanded with a uniform expansion force by the above-mentioned bracing method, and then one end of the fixing band is fastened. To do. In the conventional method of pushing the annular fixing band and spreading it to stop water (Jikkai 1-177757).
No.), the fixing band is divided into 2 parts for small diameter pipes and 3 parts for large diameter pipes, and after expanding the dividing part of the fixing band in the tangential direction with a jack etc., the dividing part is tightened with the fixing metal fittings. It was unavoidable that the thickness of the band member that opposes the force was required, and that the fixing metal fittings of the split portion protruded from the inner cross section of the annular body and received the resistance of the water flow.

According to the means and method of the present invention, it is possible to hold down the fixing band with an even expansion force and then tighten and fix the fixing metal fittings at one of the fixing band dividing portions, and the member thickness of the fixing band becomes thin. As a result, the thickness of the annular body is reduced, and it is possible to join the fixed band in advance with a hinge or the like except at one location, or to use a fixed band in which a roll-shaped leaf spring is expanded. Thus, the fixing metal fittings protrude from the inner cross section of the annular body and receive the resistance to the water flow at only one location, which reduces the resistance to the water flow and contributes to the reduction of the construction cost.

[0013]

The present invention will be described in more detail below with reference to the illustrated embodiments. In each figure, 10 is a pipe body of a buried pipe installed in the ground, which is formed by adding a certain length of precast concrete to form a pipe line, and a human hole at an appropriate place, It has a so-called manhole 11. The diameter of the manhole 11 is usually 60 cm or more,
It is an important element as an economical and urgent pipe rehabilitation method to process the material into a size that allows the material to be carried in through the manhole 11.

The reinforcing pipe 20 is provided to counter the internal water pressure.
A rolled-up steel pipe made by elastically bending SUS304 steel plate,
In order to be able to carry in from a normal 60 cm manhole 11, a SUS304 is installed in an elastic bending and winding tube manufacturing machine 27 having a drum 25 having a diameter of 50 cm and a guide roller 26.
The steel plate is fixed and wound into a bundle 24, and the reinforcing pipe member 21 is formed. The elastic bending and winding tube manufacturing machine 27 is lightweight and portable, and it becomes possible to exert an economic effect by locally manufacturing the tube. The elastic bending and winding pipe manufacturing machine 27 can also manufacture a long pipe having a large diameter depending on the construction condition of the buried pipe, and exhibits a more economical effect.

When plastic deformation processing is carried out to a size that can be carried in from a normal manhole 11 having a diameter of 60 cm, it takes labor to expand the diameter and is not efficient, so elastically deformed steel plate is rolled into a reinforcing pipe material 21. An efficient manufacturing method of the reinforcing pipe member 21 is used, in which the bundle 24 is bound and the diameter is expanded by itself when the bundle 24 is unwound in the pipe body 10 of the buried pipe. Thus, since no gap is created between the pipe body 10 of the buried pipe and the reinforcing pipe 20, injection of cement milk or the like is not required, which is economical, and above all, reduction of the cross-sectional area of water supply is minimized.
The smooth surface of the 304 steel plate reduces the resistance of the water flow and exerts the effect of maintaining the water supply capacity.

When the diameter of the reinforcing pipe member 21 is expanded, the reinforcing pipe member 2 is
Since the end sides 22 of the pipe 1 along the pipe axial direction overlap, the pipe axial direction is overlapped and welded to manufacture the reinforcing short pipe 28.
The following reinforcement pipe member 21 is overlapped on the end of No. 8 to expand the diameter, and the overlapped end 23 is welded repeatedly to complete the reinforcement pipe 20 having the same length as the pipe body 10. The pipe body 10 of the buried pipe is integrated with the reinforcing pipe 20 to form the rehabilitation pipe 30. The joint positions of the rehabilitation pipes 30 are the same as the joints of the pipe body 10. As a joining technique, the annular body 31 whose resistance to running water is greatly reduced is attached to the joint portion of the reinforcing pipe 20. In this joining method, the pipe body 10 of the buried pipe can be rehabilitated either by one unit or continuously, and the pipe rehabilitation method having earthquake resistance is obtained by the joining method having flexibility and stretchability.

By placing this reinforcing pipe 20 at the same joint position as the pipe body 10 of the buried pipe and joining it with the annular body 31 having expansion and contraction flexibility, the stress is released and a thin pipe thickness corresponding to the internal pressure is sufficient, and it is economical. It will be static and earthquake resistant.

When the rehabilitation pipe 30 is joined with the annular body 31, the water flow resistance of the annular body 31 causes a decrease in the amount of water to be delivered when the number of joints increases, which causes practical inconvenience. Therefore, the low-loss head type annular body is used. 31 is required. Ring 3
As a result of measuring the head loss by performing hydraulic experiments with various shapes for No. 1, as a requirement for the low-loss head type annular body 31, the thickness of the annular body is made as thin as possible, and the flow direction in the tubular body of the annular body is reduced. It is most desirable that the corners at both ends have a curved bell mouth shape 32, and that when the fixing band 40 is attached to the annular body 31, the annular body 31 has the same inner diameter to eliminate the unevenness, so that the most resistance to water flow is obtained. It was confirmed that the shape of the ring was small. For that purpose, the depth of the embedding groove 38 of the fixing band 40 is the amount of change due to compression of the stress concentration ridge 35, and the depth of the embedding groove 38 of the fixing band 40 is the amount of change due to compression of the stress concentration ridge 35. It is necessary to strictly control the thickness of the fixing band 40 and ensure the smoothness of the inner surface of the annular body 31.

The annular body 31 has a shape for ensuring the water blocking effect. A plurality of water blocking ridges 34 are provided all around the outer circumference of the main body, and stress concentration ridges 35 are provided along the entire inner circumference of the main body. By this, the tightening stress of the fixing band 40 is concentrated and the water blocking effect is ensured. As the shape of the annular body 31, as the water blocking ridge 34 is compressed by tightening the fixing band 40,
The tips 33 of the bellmouth shape 32 at both ends of the annular body 31 also have an outer diameter to be compressed. As a result, the water blocking effect and the bell mouth shapes 32 at both ends of the annular body exert a function of preventing vibration and separation due to running water (see FIG. 7).

Further, the annular body 31 has the same inner diameter when the fixing band 40 is attached, and has the shape of the annular body 31 in which the resistance against water flow is small, so that the central portion 37 of the annular body 31.
Is thicker and the effect of resisting the deformation due to water pressure is improved, but the increased rigidity may reduce the workability when the annular body 31 is attached. In general, most of the joints of buried pipes are not straight but have a declination, and it is expected that the declination of the joint will increase during an earthquake or uneven settlement of the ground. It is feared that the water blocking effect will be reduced by twisting around, so as a function to prevent this, a plurality of cut grooves 36 are provided all around the outer circumference of the central portion 37 of the annular body 31 to ensure flexibility. , Improve workability and watertightness in case of earthquake or uneven settlement of the ground.

The method of pressing the annular body 31 against the reinforcing pipe 20 to stop the water is conventionally performed by tightening the annular body 31 by sequentially expanding the fixing band 40 in the tangential direction with a jack or the like. In order to prevent the uneven tightening due to the action of the expanding force from one place, which is the drawback of Is.

As an example of the construction of the brace expansion method, an example in which the driving means 50 shown by a hydraulic cylinder jack and the reaction force receiving fitting 42 are combined is shown. The pressure receiving metal fitting 42 engages the insertion hole 44 provided in the connection plate 43 with the nut 45 welded to the end portion of the band member 41, and the bolt 46.
Respectively, and rotatably connected by a connecting pin 47 by using a driving means 50 shown by a hydraulic cylinder jack.

Further, the tangential oblique members 48, 48 are provided at positions approximately 90 degrees to the left and right in the circumferential direction from the hydraulic jack 50.
The connecting metal fittings 54, 54 are arranged through the insertion holes 51 provided in the connection plate 49 of the connecting metal fitting 54 and the nut 52 welded to the band member 41, and the bolts 64 are tightened respectively. Fix it symmetrically (see Figure 4). The diagonal members 48, 48 and the connecting fittings 54, 54 are also connected by the connecting pin 47. Although welding the nut 52 to the band member 41 slightly increases the resistance of the water flow,
It is possible to prevent a decrease in strength due to drilling a screw for joining the bolt 46 to the band member 41.

The expanding force of the driving means 50 inscribed in the fixed band 40 is generated by the oblique members 48, 48 and the band member 41.
About 180 on the side of the driving means 50 which is controlled by the coupling of
And the arch structure is divided into about 180 degrees and operates. In the case of such division and operation, it has been confirmed that the fixing band 40 is divided by the connecting fittings 54, the driving means 50 is attached at two places, and the fixing band 40 is expanded at the same time.

The fixing band 40 is composed of a band member 41 which is carried into the pipe body 10 of the buried pipe in two or three divisions, and the joining thereof is carried out by the uniform expansion action of the brace expanding method 70. Allows for a single extension point. A ring 55 is welded to each of the steel band members 41 as a hinge, and the hinge 56 can be joined by inserting the shaft 56 into the hinge ring 55 before expanding and tightening.

The inner diameter of the tubular body 10 has a tolerance with respect to the nominal inner diameter, and the annular body 31 which is an elastic body can cope with the tolerance by compression and extension, but the fixing band 40
Requires a function of adjusting the length capable of coping with the tolerance and a function of uniformly compressing the annular body 31 to maintain the waterproof property as the function of the final joint portion.

The function of adjusting the length is that the fixing band 4 after the diameter expansion
This is a method in which both ends of 0 are fixed by inserting bolts 64 into the connecting plate 61, and the connecting plate 61 has a curvature that matches the band member 41. The adjustment elongated hole 62 provided in the connecting plate 61 has a structure in which the water blocking performance of the annular body 31 does not decrease even if the tightening bolt 64 is loosened temporarily. Secure the prevention function. If the amount of compression change in diameter is allowed to be about 2 mm from the waterproofness of the annular body 31, the overlapping interval of the bolt holes needs to be 7 mm or less in terms of circumference, and the diameter of the bolt 64 is 1 mm.
It is effective to set the bolt hole to about 2 mm and to make the bolt hole as close to the diameter of the bolt 64 as possible. Further, the fine adjustment long hole 63 on the other side of the connecting plate 61 has a length that can be adjusted only by the overlapping interval of the bolt holes, so that the adjustment within the allowable tolerance can be performed steplessly, and the looseness of the bolt 64 causes the annular shape. It is possible to prevent the body 31 from being loosened to a minimum and prevent the deterioration of the water blocking performance.

The annular body 3 is adjusted by adjusting the length of the fixing band 40.
The waterproof property of the blank part of the band member 41 which is deviated from 1 is secured. For this reason, the supplementary material 65 having the same thickness and curvature as the band member 41 is provided in the blank portion in the stress concentration ridge 3 of the annular body 31.
Hold and pinch so that 5 is compressed. As a result, both ends of the band member 41 and the connecting plate 61 are fixed by the bolts 64, and the waterproof property is secured. Reference numeral 66 is a female thread portion, and 67 is a hydraulic pipe.

[0029]

EFFECTS OF THE INVENTION Since the present invention is constructed and operates as described above, by making it possible to carry in a reinforcing material for an aged pipe from a manhole, there is little influence on local residents and construction can be completed in a short period of time. It also has the effect of being constructed as a higher-standard buried pipe line, with the addition of seismic resistance and corrosion resistance, without reducing the water supply capacity. According to the present invention characterized by this effect, a low loss head-shaped annular body and a fixing band using a thin plate SUS304 steel plate subjected to elastic deformation bending are applied to the existing buried pipe by applying a bracing and expanding method.
This is the result of the development of a comprehensive new construction method.

[Brief description of drawings]

FIG. 1A is a sectional view for explaining an embodiment of a pipe connecting device in a seismic resistant pipe rehabilitation method capable of improving the performance of a buried pipe according to the present invention. (B) Explanatory drawing of an elastic bending and winding tube manufacturing machine.

FIG. 2 is an exploded perspective view for explaining members and the like used in the above apparatus.

FIG. 3 (a) is a plan view of a fixed band final connection portion. (B) Similarly, a side view. (C) Similarly, a cross section.

FIG. 4 is a sectional view for explaining a brace construction method applied to the above-mentioned device.

FIG. 5 is a cross-sectional view of a connecting fitting used in the same device.

FIG. 6 is a cross-sectional view showing the relationship between members and driving means used in the above-mentioned device.

FIG. 7 is an enlarged sectional view for explaining the annular body.

Claims (7)

[Claims] 1. When a new reinforcing pipe is installed in an existing pipe for the purpose of rehabilitating an existing pipe,
The steel shaft is rolled into a roll shape by elastic deformation bending, and is bound using string, and is unloaded after being loaded into the existing pipe body, and the diameter of the pipe shaft is expanded so that it almost adheres to the inner surface of the existing pipe body. By welding the edges along the direction, a reinforcing pipe having a cylindrical shape and the same length as one existing pipe body is formed, whereby the reinforcing pipe and the existing pipe body form an integral rehabilitation pipe. Then, by fixing the annular body made of an elastic material to the inner surface in order to connect the end portions of the rehabilitation pipe, the rehabilitation pipes are connected flexibly, watertightly and expandably, and the annular body is fixed. The band is subjected to a uniform expansion action by expanding and tightening the band, which reduces the material thickness of the annular body, and the fixing band that fixes the annular body to the inner surface of the pipe minimizes the protrusion of the annular body and reduces the water flow resistance. Seismic resistant pipe replacement characterized by being minimal In tube connecting device to the method. 2. The reinforcing pipe is a stainless steel plate that does not require anticorrosion treatment and can be elastically bent locally by a portable roll winder so that the reinforcing pipe can be installed at the entrance of an existing pipeline. The seismic resistant pipe rehabilitation method according to claim 1, wherein a roll-in pipe having a diameter, length and weight that can be carried in according to the present invention is used, and the diameter is expanded so as to be along the surface of the existing pipe body after being carried into the pipe body. Pipe connection device. 3. When the carry-in port is small in size such as a manhole, a reinforcing short pipe having a length of a fraction of the existing pipe is connected and formed as a constituent material of the reinforcing pipe. Item 1
A pipe connecting device in the earthquake-resistant pipe rehabilitation method described. 4. The annular body has a wall thickness formed as thin as possible, and the corners at both ends of the annular body in the flow direction in the tubular body are formed into bell-mouth curved surface shapes to form the annular body in the tubular body. The pipe connecting device in the seismic resistant pipe rehabilitation method according to claim 1 or 3, wherein the fixing band fixed to the surface is within the range of the wall thickness of the annular body. 5. The annular body comprises a plurality of water stop ridges provided on the outer surface over the entire circumference, and stress concentration ridges provided on the inner surface of the annular body over the entire circumference. While concentrating stress on the water blocking ridges, the diameter-enlarging tightening compresses the water blocking ridges, and at the same time, compresses both ends of the annular body in the flow direction in the tubular body. 5. The seismic resistant pipe rehabilitation method according to claim 4, wherein a plurality of lightening portions are provided on the outer surface of the central portion of the annular body to alleviate the increase in the rigidity of the central portion of the annular body which is relatively thick. Pipe connection device. 6. The inner diameter of the tubular body has a tolerance with respect to the nominal inner diameter, and the annular body which is an elastic body can cope with the tolerance by compression and elongation, but the fixing band has a function of the final joint portion. As a, it has a function of adjusting the length that can correspond to the tolerance, and a function of uniformly compressing the annular body to maintain water blocking ability, and the function of adjusting the length is at both ends of the fixed band after the diameter expansion. Is fixed by inserting a bolt into the connecting plate, the connecting plate has a curvature that matches the fixing band, and the adjustment long hole has a structure in which the waterproofness of the annular body does not decrease even if the tightening bolt is loosened temporarily. By overlapping the holes and continuing to secure the length adjustment function and the loosening prevention function, one fine adjustment long hole of the connecting plate is a length that can be adjusted by the overlapping interval of the bolt holes, Adjustment within the allowable tolerance is possible steplessly, and the bolt The same as the band member in the blank part in order to secure the waterproofness of the blank part of the band member that comes off the annular body by adjusting the length of the fixing band while preventing the looseness of the annular body from being loosened to the minimum and preventing the water stoppage The pipe connecting device in the seismic resistant pipe rehabilitation method according to any one of claims 1 to 5, wherein a supplementary material having a thickness and a curvature is sandwiched and held so that the stress concentration ridges of the annular body are compressed. . 7. A method of applying a uniform compressive force to the annular body by expanding the diameter of the fixing band in order to enable manual construction in a narrow tubular body, by bracing an arc length of about 90 degrees from both ends of the fixing band. 7. The pipe connecting device in the seismic resistant pipe rehabilitation method according to any one of claims 1 to 6, wherein the pipes are connected to each other, and jacks are inserted into both ends of the fixing band to expand the diameter at one location regardless of the diameter. .