JPS5910639A - Repairing of drain pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for repairing a drainage canal, and more particularly to a method for repairing a drainage canal without requiring excavation. For example, due to aging, erosion occurs on the inner surface of the waterway, and soil erosion causes deformation and destruction of the waterway. Furthermore, the slope of the waterway changes depending on the ground law etc. In addition, water leakage occurs due to oxidation and aging of joint materials in drainage channels. As this water leaks, the earth and sand around the V-way flows in, causing loosening of the pipe. These aging pipelines are either replaced or scrapped and new drainage channels installed. Conventionally, pipeline replacement is carried out using the cut-and-cut method. The cut-and-cover method is used when there is no structure above the drainage channel or when the function of the superstructure can be stopped for a certain period of time, and when the structure is relatively inexpensive. According to this cut-and-cut construction method, the entire waterway is excavated and replaced, or only severely damaged sections are replaced. But this -1
-According to the law, two huge costs and one phase are required, including the work to prevent loosening of the surrounding ground caused by re-excavation. Therefore, not only will it affect the surrounding buildings, but if the superstructure is a public road, etc., it will cause a great deal of inconvenience to users due to the use of the structure and noise until the project is completed. Furthermore, it is difficult to take appropriate measures in the event of a sudden rise in water during construction. If the cut-and-cut method cannot be used, a new drainage channel is constructed separately, but compared to the cut-and-cut method, a large amount of money is required to secure the land, so it is not necessary to construct a new drainage channel along with other major construction work. In fact, unless you do it, it is possible to do two things. The object of the present invention is to provide a method for repairing a drain pipe that can repair an aged drain pipe without requiring excavation.

In order to achieve the following two objects, the present invention provides the following features:
The present invention is characterized in that after a cement-based hardening agent is injected through the drain pipe and the adjustment support pipe is inserted into the drainage pipe, the drainage pipe and the adjustment support pipe are integrated. Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a cross-sectional view of a drain pipe l that has been destroyed by earth pressure. This drainage pipe 1 was destroyed due to the creation of voids in the earth and sand around the pipe due to leakage of water and inflow of sediment due to poor construction and aging of the joint, and the vertical diameter D' was This is approximately 75% of the road diameter.

When repairing such a drain pipe 1, a support steel pipe 2 having a pipe diameter of 90 to 95% of the normal waterway diameter is used as shown in Fig. 2.
After cutting it into quarters and temporarily killing it from the bottom of the drainage canal, use a combination of 4 to 8 100-4001-inch hydraulic jacks to jack it until it approaches the original diameter.

At this time, as shown in Fig. 3, if an H-shaped net 4.4, which is longer than the unit waterway length, has a length S length in the longitudinal direction, and has dimensions of approximately 300 mm x 300 mm, is configured to hold the jack pace, the gradient will be reduced. The changed part 5.5 is corrected to a normal slope by jacking. After reaching 90 to 95% of the normal channel diameter by jacking, the four-split support steel pipe 2 is attached by welding to complete the installation. Note that FIG. 4 is a sectional view showing in detail the state of jacking by the hydraulic jack 6. The length of the support steel pipe 2 is about 1000+nn+-1500 mm because it is drawn in from the downstream manhole, and the thickness is about 20 mm because a pressure of about 100 to 400 tons is partially applied.

However, these dimensions and shapes are merely examples, and the present invention is not limited thereto. At the joint portion of the quarter-split support steel pipe 2 installed in close contact with the drain pipe 1, there is a step due to overlap welding, and the sloped portion of the bottom surface is also uneven. To solve this problem, an adjustment main pipe 7 is installed inside the support steel pipe 2. Since the adjusting wood pipe 7 is installed for the purpose of adjusting the slope and bending in the left and right directions, it is used to have a diameter d that is 80 to 85% of the normal waterway diameter, as shown in FIG. Although the waterway diameter is reduced by installing the adjustment main pipe 7, since the adjustment main pipe 7 is made of steel, the roughness coefficient is different from that of the concrete drainage pipe 1.

Therefore, even if the cross-sectional area is reduced, the flow velocity increases, so there is little effect on the flow rate. When installing the adjustment main pipe 7, after measuring the correct slope and the horizontal deviation of the support steel pipe 2 four times, determine the greatest common divisor position, and use the spacer 8 as shown in FIG. Hold in position and perform welding. Note that the pipe diameter and number of split U's of the adjustment main pipe 7 are determined by examining the delivery and lead-in conditions to the installation point. Thereafter, the adjustment main pipe 7 is temporarily assembled and pulled in for installation. Next, as shown in FIG. 7, four grout horns 9 are installed, one in each middle of the drainage channel, to integrate the mulberry 11, the water channel, and the adjustment head 1117. Support steel pipe 2 with support steel pipe 2 installed
If there is a gap between the
By providing a grout hole on the order of cm in the support steel pipe 2, the gap is filled when the chemical is poured through the adjustment main pipe 7. In addition, if an air valve is installed in the adjustment main pipe to release air, the dosing will be done evenly. If the degree of damage to the drain pipe l is slight, for example, as shown in Figure 8, if the diameter D' of the damaged drain pipe l is 90% or more than the original diameter, the drainage pipe should be expanded. Install adjustment support pipes without any construction work. When installing the adjustment support pipe, as shown in Figure 9, chemical injection nozzles 10 are installed at 4 locations per unit of drainage channel, and cement-based hardening agent is injected into the outside of the drainage channel 1. . At the same time, the left and right deviations of the pipe internal slope and the degree of fracture are measured, and the adjustment support pipe 11 is installed after determining the value ν1 that will maximize the diameter of the adjustment support +Y'i'ill. As with the adjustment main pipe 7, the length and length of the steel pipe used as the adjustment support pipe 11 are determined by considering the conditions of delivery and lead-in to the installation point, and the size and shape of the cross section of the input hole. In addition, when the adjustment support pipe 11 is drawn in and installed, the gap between the D and water channels is adjusted using a spacer 15 welded to the adjustment support pipe 11 with the required dimensions measured in advance as shown in Fig. 10. . The spacer 11 serves to position the support tube 11 at a target position. After installing the adjustment support fil, a grout nozzle 9 is provided at one location in the middle 4rf of JJI water in' 1 to inject a cement-based hardening agent to integrate the drainage channel and the adjustment support 111. At this time, filling is facilitated by lowering the internal pressure by 10,000 yen during the pouring operation and by providing air at necessary locations on the adjustment support 'tll so that the grout is uniformly filled.

FIG. 11 is a sectional view showing the state of the seal at the end portion of the adjustment support vll. That is, the sealing cement 12 and the UG grout 13 perform capping with the drainage channel, and at the same time form a stopper for the grout, thereby achieving a more precise water stop. For water pipes in the early stages of destruction where erosion is seen only at the joints of the drain, use ff1.
As shown in Figures 12 and 13, seal cement 12 and UG grout 13 are used to stop the water.Also, if there are vertical cracks as shown in Figure 14, after sealing them, Install 4 nozzles in each location and inject cement-based hardening agent into the outside of the drain pipe.
By filling the gap between the pipe and the outside, the pressure resistance of the water distribution channel will be increased and its life will be extended. In addition, 14 in the figure shows a cell coat.

Furthermore, by applying a mixture of epoxy resin and glass-based resin to the steel pipe section, stronger inner surface protection can be achieved. In addition, it is necessary to water-stop the manhole as well as the distribution channel to prevent water leakage and sediment inflow from the large hole. 1st
Figures 5 to 17 are cross-sectional views showing the state of water stopping at the large hole slab joint, large hole side block joint, and large hole frame crack, respectively.
IF with seal cement 12 and UG grout 13
Water is applied. Of course, depending on the degree of damage to the manhole, it is possible to provide a complete water stoppage using a steel pipe in the same way as the water drain pipe 1. FIG. 18 is a cross-sectional view schematically showing how the adjustment main pipe 7 is pulled in when the drainage pipe l has progressed to destruction and requires repair by jacking up.
- The adjustment main pipe 7 is shown being pulled in by the winch 16 installed at the bottom. Further, FIG. 19 is a sectional view schematically showing how the adjustment support tube 11 is inserted through the large hole using the crane 17 and pulled into the repaired area.

] - As mentioned above, the present invention makes the area around the drain pipe robust, and after inserting the adjustment support pipe into the water control pipe, the drainage pipe and the adjustment support pipe are integrated, so there is no need for excavation. You can repair famous drain pipes. Furthermore, since the ground around the drain pipe is stabilized, there is no risk of ground subsidence, etc.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of an example of a drainage pipe that has been damaged by Tonosho, Figure 2 is a cross-sectional view of an example of a wood pipe supported by the support steel pipe according to the present invention, and Figure 3 is a jack-up. FIG. 4 is a sectional side view of an embodiment of the present invention showing a method of correcting the slope; FIG. 4 is a sectional view of an embodiment of the invention showing jacking; FIG. FIG. 6 is a cross-sectional view of an embodiment of the present invention showing how the adjustable wood pipe is supported by a spacer; FIG. 7 is a cross-sectional view of an embodiment of the present invention showing how chemical injection is performed 8 is a sectional view showing an example of a drain pipe with little damage. FIG. 9 is a sectional view of an embodiment of the present invention showing how an adjustment support pipe is installed and medicine is injected. FIG. 11 is a sectional view of an embodiment of the present invention showing how the adjustment support tube is held by a spacer, and FIG. 11 is a sectional view of the embodiment of the invention showing how the end portion of the adjustment support tube is sealed. Fig. 12 is a partial cross-sectional view of an embodiment of the present invention showing how water is stopped when a joint is slightly damaged, and Fig. 13 t' shows how water is stopped when a type of joint is different from the one shown in Fig. 12. FIG. 2 is a partial cross-sectional view of an embodiment of the present invention. Fig. 14 is a partial sectional view of an embodiment of the present invention showing how water is stopped at a vertical crack in a pipe, and Fig. 15 is a partial sectional view of an embodiment of the present invention showing how water is stopped at a large hole slab joint. Figure 16 is a partial cross-sectional view of an embodiment of the present invention showing how water is stopped at a mass joint on the manhole side, and Figure 17 is an embodiment of the present invention showing how water is stopped in a large hole frame crack. 18 is a cross-sectional view of an embodiment of the present invention showing how the adjustment wood pipe is being pulled in, and Figure 19 is a cross-sectional view of an embodiment of the present invention showing how the adjustment support pipe is being pulled in from the large hole. It is a diagram. Here, l...drain pipe, 2... support steel pipe, 6...
Jacket, 7... Adjustment woodwind, 8... Spacer, 9
... Grout nozzle, 10... Chemical injection nozzle, 11.
...Adjustment support pipe, 12...Seal cement, 13...
・UG grout. Patent Applicant Mori Mitsuru Kubo Agent Patent Attorney Yasunori Otsuka Figure 7 Figure 8 Figure 9 Figure 1) Figure 10 Figure 12 Figure 13 Figure 14 Figure 12 Figure 15 Figure 16

Claims (2)

[Claims] (1) A method for repairing a drain pipe buried underground, which includes a step of installing a chemical injection nozzle in the drain pipe and injecting a hardening agent to the external force of the drain pipe, and adjusting it through a spacer inside the drain pipe. Drainage pipe repair consisting of a step of installing a support pipe, and a step of installing a chemical injection nozzle in the adjustment support pipe and injecting a cement-based hardening agent to integrate the drainage pipe and the adjustment support pipe. The bottom is ;. (2) The method for repairing a drain pipe according to item 1, wherein the hardening agent is a cement-based hardening agent.