JP2005226819A - Construction method for lining inner surface of existing pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for lining the inner surface of an existing pipe capable of forming a lining with a large final strength by applying a rather simple reinforcement means with excellent construction efficiency. <P>SOLUTION: A reinforcement steel sheet having a joint part formed in a ring shape and capable of selectively taking a connected state and a non-connected state at least at one position in the circumferential direction is used for the reinforcement material of the lining. Before the existing pipe is lined, after the joint part of the reinforcement steel sheet is brought into the non-connected state, and in a radially reduced state, the steel sheet is inserted into the existing pipe through a manhole furnished with the existing pipe, the reinforcement steel sheet is radially increased and the joint part is connected in the existing pipe to install the reinforcement steel sheet along the inner surface of the existing pipe coaxially without substantially leaving any clearance. By repeating these operations in order, the reinforcement steel sheets are installed over the entire length of a construction district and then the liner is formed on the reinforcement steel sheets. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an inner surface lining method for an existing pipe, and more particularly to an inner surface lining method for an existing pipe that can form a lining having a high final strength by applying a reinforcing means.

  In existing pipes embedded in roads with heavy traffic such as trucks, such as sewage pipes, it is desirable to increase the strength of the inner lining in consideration of load resistance and impact resistance.

  In view of such demands, the inventors of the present invention disclosed in Japanese Patent Application Laid-Open No. 11-13986, after arranging reinforcing bars in a spiral shape under the application of reinforcing bar fittings in an existing pipe, from above the reinforcing bars. An inner lining method was proposed to form a liner and inject and fill a backfill material on the back of the liner.

  According to the inner surface lining method described above, an inner surface lining having a high final strength can be formed by applying a reinforcing means. However, a large amount of work and time are required for mounting and fixing the reinforcing bar locking device and spiral winding of the reinforcing bar. However, construction has become complicated, and further improvement in construction has been desired.

  An object of the present invention is to provide an inner surface lining method for an existing pipe, which can form a lining having a high final strength by applying a relatively simple reinforcing means having excellent workability.

  Other features of the present invention will become apparent from the following description.

Means for Solving the Invention

  The present invention applies a steel plate for reinforcement having a joint portion that can selectively take a connected state and a non-bonded state in at least one place in the circumferential direction as a reinforcing material for the lining. Prior to the above, after the joint portion of the reinforcing steel plate is in a non-bonded state and is reduced in diameter, it is carried into the existing pipe through a manhole attached to the existing pipe, and then the diameter of the reinforcing steel plate and the joint portion are set in the existing pipe. The reinforcing steel plate is installed concentrically and substantially without gaps along the inner surface of the existing pipe, and the reinforcing steel plate is installed over the entire length of the construction section by sequentially repeating such operations. Then, after that, the present invention relates to an inner surface lining method for an existing pipe characterized in that a liner is formed on a reinforcing steel plate.

  According to a preferred embodiment of the present invention, the ring-shaped reinforcing steel sheet has a joint portion at one location, and the reinforcing steel sheet is uncoupled from the joint portion and is reduced in diameter to a manhole. It is carried into the existing pipe.

  According to another preferred embodiment, the ring-shaped reinforcing steel sheet has joint portions at a plurality of locations, and is divided into a plurality of arc-shaped elements based on the joint portions, and the arc-shaped elements have a reduced diameter. It is carried into the existing pipe through the manhole.

  Further, according to a preferred embodiment of the present invention, the joint portion includes a tenon-like concave portion and a tenon-like convex portion as constituent elements, and these concave and convex portions are fitted and locked from the direction of the plate thickness, It becomes a non-bonded state by releasing the fitting lock.

  According to a preferred embodiment of the present invention, a porous reinforcing steel sheet can be applied as the reinforcing steel sheet. In this case, the porous reinforcing steel sheet includes a spacer on the back surface, and after the reinforcing steel sheet is installed, A space is formed between the reinforcing steel plate and the inner surface of the existing pipe by the spacer, and the backfill material is filled into the space through the porous portion of the reinforcing steel plate when the backfill material is injected and filled.

The invention's effect

  According to the construction method of the present invention, the inner lining is reinforced with a ring-shaped reinforcing steel plate installed in an existing pipe, and in the construction, the hook portion (bonded state) of the ring-shaped reinforcing steel plate is removed (joined state) ( The conventional reinforcement method that requires the installation and fixing of a large number of reinforcing bar fittings to the existing pipe inner surface (concrete wall surface) and the helical winding of the reinforcing bars Reinforcing work is much easier and easier than that. Therefore, according to the present invention, it is possible to form a lining having a high final strength by applying a relatively simple reinforcing means having excellent workability, and to provide an inner surface lining method for an existing pipe that can achieve the purpose of reinforcement advantageously in workability. can do.

  An embodiment of the present invention will be described below with reference to the accompanying drawings. In the method of the present invention, as shown in FIGS. 1 and 2, a ring-shaped reinforcing steel plate 1 is used as a reinforcing material. The reinforcing steel plate 1 has an outer diameter substantially equal to or slightly smaller than the inner diameter of an existing pipe to be lined, such as a sewer pipe a (see FIG. 4), and a width W (see FIG. 2) is attached to the sewer pipe a. The width is such that it can pass through the manhole b. For example, the width is set to a narrow width of about 1/2 to 1/4 of the diameter of the manhole b. Further, a joint portion 2 is provided at one place in the circumferential direction, and the joint portion 2 is configured to be able to selectively take a coupled state and a non-coupled state. In FIG. 2, the joint portion 2 is configured to include tenon-like uneven portions 2a and 2b as components, and these uneven portions 2a and 2b are fitted and locked (coupled state) or from the direction of the plate thickness. It is configured to be released from the fitting lock (non-bonded state). The joint portion 2 is not particularly limited as long as it has a configuration that can selectively take a coupled state and a non-coupled state.

  In the construction, in order to enable the reinforcing steel plate 1 to be carried from the manhole b into the sewage pipe a connected thereto, as shown in FIG. The diameter is reduced to a shape. With this reduced diameter, the reinforcing steel plate 1 can be carried into the sewer pipe a connected to the manhole b as shown in FIG. After carrying in the sewage pipe a, the reinforcing steel plate 1 is returned from the reduced diameter state to the state before the diameter reduction (expansion) from the state shown in FIG. 5, and the joint portion 2 is joined and constrained in a ring shape. Accordingly, as shown in FIG. 6, the reinforcing steel plate 1 can be installed in the sewer pipe a concentrically and substantially without a gap. In addition, it is possible to join the seam portion by applying welding means instead of the seam portion 2, however, welding requires a specialist, and it is not easy to secure human resources. Water drops are often dropped and the environment is not suitable for welding, and the application of such welding means is not preferable from the viewpoint of construction, quality and cost.

  As shown in FIG. 7, the ring-shaped installation of the reinforcing steel plate 1 in the sewer pipe a is performed over the entire length of the construction section, and after the installation of the reinforcing steel plate 1 is finished, the reinforcing steel plate By forming the liner from above 1 and injecting and filling the back-filling material into the back surface of the liner, a lining with high final strength reinforced by the reinforcing steel plate 1 can be formed. Although FIG. 7 shows the case where the reinforcing steel plate 1 is installed on the straight portion of the existing pipe, a tapered reinforcing steel plate 1A as shown in FIG. 8 can be applied to the curved portion.

  The method of the present invention is a method of reinforcing the lining by applying the ring-shaped reinforcing steel plate 1, and the carrying-in of the reinforcing steel plate 1 into the sewage pipe a is performed by removing the joint portion 2 and reducing the diameter. In the sewer pipe a, the diameter of the reinforcing steel plate 1 and the coupling portion 2 can be simply connected to each other, and a large number of rebar locking metal fittings can be fixed and spirally wound. Construction becomes easier compared to the required conventional method.

  In the present invention, as shown in FIG. 9, the ring-shaped reinforcing steel sheet 1 may be divided into two arc-shaped elements 1a and 1a by joint portions 2 provided at two locations. In this case, as shown in FIG. 9, each arcuate element 1a, 1a is carried into the sewage pipe through the manhole b while being reduced in diameter so that the radius of curvature is somewhat reduced. As shown in FIG. 11, the reinforcing steel plate 1 can be installed in a ring shape in the sewer pipe a by combining the diameter of the joint and the joint portion 2.

  As shown in FIG. 12, as the joint portion 2, it is convenient to adjust the dimension (diameter) of the reinforcing steel plate 1 by increasing / decreasing the intermediate member 2 c by adopting a configuration in which the intermediate member 2 c can be applied. .

  When the joint portion 2 is composed of tenon-like uneven portions 2a and 2b, the uneven portions 2a and 2b in the fitting and locked state may be detached in the plate thickness direction in the combined state. As shown in FIGS. 13 and 14, the blind rivet 3 can be applied to the fitting locking portion. In addition, you may make it the structure which performs removal prevention by application of fasteners, such as a screw | thread.

  In order to increase the bond strength with the backfill material, a porous reinforcing steel plate 1B as shown in FIG. 15 can be applied as the reinforcing material. In this case, as shown in FIGS. 16 and 17, the spacer 4 is provided on the back surface of the porous reinforcing steel sheet 1 </ b> B so that a circumferential space c is formed between the spacer and the sewer pipe a when installed in the sewer pipe a. Since the backfilling material flows into the peripheral space c through the porous portion 1B1 of the reinforcing steel plate 1B and is filled when the backfilling material is injected and filled, the backfilling material and the reinforcing steel plate 1B are filled with each other. Bonding can be made even stronger.

  In the embodiment, an example of a sewer pipe in which only earth pressure acts on the pipe has been shown, but the reinforcing steel plate 1 is also effective in a pipe in which internal pressure acts, such as a pressure feed pipe and a water pipe.

It is a front view of the ring-shaped reinforcement steel plate applied to this invention construction method. FIG. It is a front view which shows a diameter reduction situation similarly. It is explanatory drawing which shows the condition at the time of carrying in in the existing pipe | tube of the steel plate for reinforcement. It is a front view which shows the condition after carrying in into an existing pipe same as the above. It is a front view which shows the condition after installation in an existing pipe. It is explanatory drawing which shows the installation condition in all the sections in an existing pipe same as the above. It is a side view which shows an example of the tapering type reinforcement steel plate applied to the curved pipe part of the existing pipe. It is a front view which shows an example of the steel plate for reinforcement of a split type. It is a front view which shows the condition at the time of carrying in into an existing pipe. It is a front view which shows the installation condition in an existing pipe. It is explanatory drawing which shows the structure of the joint part which can adjust a dimension. It is a partial top view which shows the condition which gave the detachment to the joint part. FIG. It is a top view which shows the steel plate for porous reinforcement. It is a top view which shows the steel plate for porous reinforcement provided with the spacer. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reinforcing steel plate 1A Tapered reinforcing steel plate 1B Porous reinforcing steel plate 2 Joint portion 2a Joint portion concave portion 2b Same as above, Convex portion 3 Blind rivet 4 Spacer

Claims (6)

As a reinforcing material for the lining, a reinforcing steel plate provided with a joint portion capable of selectively taking a combined state and a non-bonded state in at least one place in the circumferential direction as a ring is applied, and prior to the lining of the existing pipe, After the reinforcing steel plate is carried into the existing pipe through the manhole attached to the existing pipe in a state where the joint portion is in a non-bonded state and the diameter is reduced, the diameter of the reinforcing steel plate is joined to the joint portion in the existing pipe. The reinforcing steel sheet is installed concentrically along the inner surface of the existing pipe without substantial gaps, and the reinforcing steel sheet is installed over the entire length of the construction section by sequentially repeating such operations. An inner lining method for an existing pipe, characterized in that a liner is formed on the reinforcing steel plate. The ring-shaped reinforcing steel sheet has a joint portion at one place, and the reinforcing steel sheet is carried into an existing pipe through a manhole in a state where the joint portion is removed and the diameter is reduced to a [no] shape. The inner lining method according to claim 1. The ring-shaped reinforcing steel sheet has joint portions at a plurality of locations and is divided into a plurality of arc-shaped elements based on the joint portions, and these arc-shaped elements are carried into an existing pipe through a manhole in a reduced diameter state. The inner lining method according to claim 1, wherein: The joint portion includes a tenon-like concave portion and a tenon-like convex portion as constituent elements, and the joint portion is configured by fitting and locking these concave and convex portions. The inner lining method described. 5. The inner surface lining method according to claim 1, wherein a porous reinforcing steel plate is used as the reinforcing steel plate. The porous reinforcing steel plate is provided with a spacer on the back surface, and a space is formed between the reinforcing steel plate and the existing pipe inner surface by the spacer, and the backfill material is filled into the above-mentioned space through the porous portion of the reinforcing steel plate. 6. The inner lining method according to claim 5, wherein:

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