JPH0672068B2 - Mortar hardening method in pipe mortar lining method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for forming a mortar lining layer on the inner surface of a pipe such as an aged water pipe.

[Prior art and its problems] The mortar lining method as described above uses mortar, which is an inorganic material, as the lining material, so that safe water can be secured, corrosion resistance is good, and construction costs are excellent. There are advantages.

However, since the mortar lining method requires a long curing time for the mortar, the mortar must be cut off for a long time. For this reason, in the case of the mortar lining method, it is necessary to install a temporary pipe on the road in the construction section, in a gutter, etc. to avoid long-term water interruption. It was a big problem.

Therefore, various curing accelerators that accelerate the curing of mortar have been developed, but since the pot life is long and the curing time cannot be shortened, the installation of the temporary pipe has not been omitted. .

Therefore, the present invention is intended to provide a method of accelerating the curing time of mortar after the application of mortar so that the mortar lining can be performed without installing a temporary pipe.

[Means for Solving the Problems]

In order to solve the above problems, the present invention, after applying mortar to the inner surface of the pipeline, insert a tube of a synthetic resin film into the pipeline from one end of the pipeline, and fill the tube with hot water. The mortar was heated and aged, and the tube was pulled out after the mortar was hardened.

[Action]

According to the above method, since the mortar is cured by heating, the mortar is hardened in an extremely short time, and it is not necessary to install a temporary pipe.

〔Example〕

Next, an embodiment of the present invention will be described for a case where an existing water pipe is rehabilitated by a mortar lining method.

First, we investigated the water control valves and stopcocks of the existing pipelines,
Determine the excavation location.

Then, as shown in FIG. 1, both ends of the construction section are excavated and the pipe 1 is cut by about 1 m. By installing the intake port 2, the temporary valve 3, etc., the water cutoff area is limited to only the construction section.

After this, the intake 2 on the construction pipeline side is removed, and the water in the pipe 1 is discharged. Then, after passing the rope using a wire passing machine or the like, as shown in FIG. 2, while pulling the scraper 4 and the wire brush with the power winches 5 and 6, while scraping off scales and rust, Pressured water is flown into the pipe 1 to remove and wash. Next, the plunger is pulled by power winches 5 and 6 to discharge water and the like left in the pipe 1.

After cleaning the inside of the pipe 1 in this way, as shown in FIG. 3, the lining machine 7 is set in the pipe 1,
The mortar 9 is sprayed on the inner surface of the pipe 1 while being pulled by a power winch 8 at a constant speed. The mortar 9 sprayed on the inner surface of the tube 1 is finished to have a uniform thickness by a trowel 10 attached to the tip of the lining machine 7 simultaneously with the spraying, and a lining layer having a uniform thickness is formed on the inner surface of the tube 1.

It is desirable that the mortar 9 used here is mixed with a curing accelerator that accelerates curing.

As described above, when the pipe 1 is lined, if the water dip 11 exists in the pipe, the water dip 11 is closed by the mortar 9. Therefore, after the above lining, as shown in FIG.
Air pressure is applied to the inside of the pipe 1 by 12 and the respective water stop plugs 13 are opened in this state, so that the mortar 9 blocking the water dip 11 is removed.

After that, a tube 14 made of a synthetic resin film such as polyethylene is inserted into the tube 1, and hot water 15 at about 70 ° C. is filled in the tube 14 to heat and cure the mortar 9. Tube 1
Insertion of the tube 14 into the inside is performed as follows. As shown in FIG. 5, guide pipes 16 bent upward are attached to both ends of the pipe 1, a mount 17 is assembled above one guide pipe 16, and a collar 18 is installed on this mount 17.
After covering the outer circumference of the collar 18 with the tube 14 and firmly fixing it with a band, the tube 14 is pushed into the collar 18 and inverted. Then, into the tube 14, the hot water wheel 19
When hot water 15 is poured from the tube 1, the tube 14 is gradually inserted into the tube 1 while being inverted by the water pressure. In this way, the tube 14 is inserted to the state shown in FIG.
Then, as it is, hot water 15
Warm the mortar 9 by.

After confirming the hardening of the mortar 9, the warm water 15 in the tube 14 is discharged from the valve 20 provided in the guide tube 16 at the tip. After this, the tube 14 is pulled out of the tube 1.

After this, an inspection is performed, the pipe 1 is connected, and water is passed through, and then the construction of the mortar lining is completed.

〔The invention's effect〕

As described above, according to the present invention, the mortar applied to the inner surface of the conduit is indirectly heated by the high temperature water through the tube of the synthetic resin film, so that the mortar is hardened in a short time. Further, since there is no evaporation of water and the water necessary for the chemical reaction for curing is secured and complete curing is possible, a high quality mortar lining layer can be obtained. Furthermore, when the viscosity of the applied mortar is low and the fluidity is high, the lining layer is pressed from the inside by hot water through the tube, resulting in a dense structure with a uniform thickness and a smooth surface lining. There is also an effect that a layer is obtained.

[Brief description of drawings]

1 to 6 are schematic views showing steps of the mortar lining method according to the present invention. 1 ... Tube, 9 ... Mortar, 14 ... Synthetic resin film tube, 15 ... High temperature water.

Claims (2)

[Claims] 1. A mortar is applied to the inner surface of a pipe, a tube of a synthetic resin film is inserted into the pipe from one end of the pipe, and hot water is filled in the tube to heat and cure the mortar. A method for hardening mortar in a mortar lining method for a pipeline, characterized in that the tube is pulled out after hardening the mortar. 2. The mortar hardening method in the mortar lining method for pipelines according to claim 1, wherein a hardening accelerator is mixed with the mortar.