JPS6332938B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of constructing a sewage attachment pipe that communicates between a sewer main pipe buried underground and a drainage basin of each household.

(Prior Art) The spread of sewerage systems in Japan has been remarkable in recent years, and the installation of main sewer pipes (main culverts) is particularly active. The installation of this main currently requires
There are trenchless and trenchless propulsion methods. In proportion to the progress of main pipe installation work, the number of sewage attachment pipes (usually pipes with an inner diameter of 100 mm to 150 mm) that connect the drainage basins of each household to the main pipe is increasing. However, compared to main pipe installation, installation of sewage attachment pipes is subject to various external factors (e.g. traffic problems,
The reality is that there are many cases where it is impossible to install cables due to the presence of structures, the influence of other buried objects, etc., and even where it is possible to install cables, it is often extremely difficult.

Conventional methods for installing sewage pipes can be broadly classified into the following three methods.

(b) Method by full excavation.

As shown in Figure 2, this method involves excavating the entire ground where the sewer main pipe a is to be buried, as shown by the shaded area b, and installing a drainage basin c in a residential area, etc.
This is a method in which the hatched area b is backfilled after the sewer pipe d is connected to the main pipe a. In the figure, e is a road surface, f is a structure such as a fence, and g is a house.

(b) A method of excavating only around the main pipe.

As shown in Figure 3, this method involves excavating only the area around main pipe a as shown by the shaded area b to expose main pipe a, and then using an excavator h or This method involves drilling a hole with a jack, using this hole to install the sewage pipe d, and then backfilling the excavated portion b.

(c) Method for main pipes with an inner diameter of 800 mm or more.

As shown in Figure 4A, this is done first by draining the drainage basin c.
A pilot hole i is drilled from the main pipe a toward the main pipe a using a boring machine or a borehole h as shown in B of the same figure, and then a worker enters the main pipe a and drills it with a hole expander as shown in C of the same figure. j is set, and the steel wire k connected to the hole expander j is pulled by the hydraulic jack l set in the drainage basin c to enlarge the pilot hole i, and then the enlargement is performed as shown in figure D. In this method, a sewage pipe d is installed in the hole m.

(Problems to be solved by the invention) Method (a) above is technically the simplest method, but since it requires excavation of the entire surface, it often becomes a traffic hindrance. If there are structures or buried objects such as retaining walls, stairs, or fences in the area, full excavation will not be possible. There is also the problem that it is impossible to carry out if the ground is prone to collapse.

In addition, method (b) has fewer restrictions than method (a), but since it is still necessary to excavate the area around main pipe a, there is still the problem that if excavation is done on road surface e, it will become an obstruction to traffic. be.

Furthermore, method (c) requires a worker to work inside main pipe a, so it cannot be implemented unless main pipe a has an inner diameter of 800 mm or more, and main pipe a is already used as a sewer. If it is still in use, there is a problem in that the working environment is extremely bad due to bad odors and gases, and work efficiency is also greatly reduced. Furthermore, even when main pipe a is not in use, there is still the problem that work efficiency is greatly reduced when working at a position intermediate between manholes.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, after driving an air impact type drilling machine into the ground where a sewage installation pipe is to be installed until it reaches the main pipe, The drilling machine is moved backwards and extracted, and then a steel pipe into which the sewage installation pipe can be inserted is driven into the hole using an air impact drilling machine until it reaches the main pipe, the inside of the steel pipe is drained, and the sewage installation pipe is inserted A hole for connection is made in the main pipe, a sewage installation pipe is inserted into the inside of the steel pipe, and its tip is fitted into the hole in the main pipe, and then adhesive is filled into the gap between the steel pipe and the sewage installation pipe. At the same time, connect the sewage pipe to the drainage basin.

(Function) As mentioned above, since the construction method of the present invention does not involve excavating the ground surface at all, it is possible to perform construction in places where it was impossible or difficult to construct with conventional construction methods, and it is also possible to perform construction in places where construction is difficult due to limitations due to the size of the main pipe. It can be constructed without any restrictions due to conditions such as soil conditions or soil quality on the main pipe side. In addition, in conventional construction methods, the inner diameter of the pipe requires a person to work inside the pipe.
Even in the case of main pipes of 800 mm or more, the construction method of the present invention does not require entering the main pipe, so there is no difficulty in working due to the generation of foul odors or gas. Furthermore, the method of the present invention allows work to be carried out efficiently even at intermediate points between manholes. As mentioned above, in the construction method of the present invention, all the work can always be performed on the ground surface, so the restrictions that existed in the conventional construction method are eliminated, the range of application is expanded, and the work efficiency is also greatly improved.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. In the figure, 1 is a residential lot, 2 is a house, 3 is a fence, 4 is a road surface, and 5 is a sewer main buried underground in the road surface 4.

In this embodiment, the position of the main pipe 5 and the distance from the drainage basin installation position to the main pipe 5 are investigated in advance using construction drawings, etc., and actual measurements are performed based on the investigation.

To carry out the actual measurement, a small air impact type drilling machine (for example, Grundmart: trade name) 6 is used as shown in Fig. 1A.
As shown in the figure, after driving the sewage pipe into the ground where the pipe is to be installed as shown by arrow A until it reaches the main pipe 5, the hole 7 is drilled by moving the drilling machine 6 backward as shown by arrow B and pulling it out. Open, the actual main 5
Measure the position and distance of. Note that 8 in the figure is an air hose connected to the drilling machine 6.

Next, as shown in FIG. 1B, a steel pipe 9 into which a sewage attachment pipe can be inserted is drilled using a flanged air impact type drilling machine 10 larger than the above-mentioned drilling machine 6, using the hole 7 as a guide.
Drive until it reaches main pipe 5. 10a is a collar of the drilling machine 10, and 11 is an air hose.

Next, as shown in FIG. 1C, after the inside of the steel pipe 9 is removed by the screw auger 12, the core drill 13 is inserted into the steel pipe 9 via the guide roller 14 attached to the drill shaft 13a. A hole 15 is made in the wall of the main pipe 5 for connecting a sewage pipe.

Next, as shown in FIG. 1E, after inserting the sewage installation pipe 16 into the steel pipe 9 and fitting its tip 16a into the hole 15, apply mortar or the like to the gap between the steel pipe 9 and the sewage installation pipe 16. An adhesive 17 is filled to fix both.

After connecting this sewage installation pipe 16 to the main pipe 5,
Alternatively, in parallel with this, a drainage basin 18 is formed and the upper end of the sewage pipe 16 is connected to the drainage basin 18, as shown in FIG. 1F.

(Effects of the invention) As mentioned above, the construction method of the present invention does not require excavation of the ground, so it can be used in places where conventional construction methods could not be used.
Alternatively, construction can be carried out in places where it would have been difficult, and construction can be carried out without restrictions due to the size of the main pipe or conditions such as the quality of the soil on the main pipe side. In addition, there is no longer any difficulty in working due to bad odors or gas generation, which is required when working on main pipes with an inner diameter of 800 mm or more, which requires a person to work inside the main pipe. In addition, even if no odor or gas is generated, conventional construction methods have various limitations when it comes to work at intermediate points between manholes, regardless of the size of the main pipe, but with the construction method of the present invention,
Because all work can always be done on the ground,
The limitations of conventional construction methods are eliminated, the range of application is expanded, and work efficiency is greatly improved.

[Brief explanation of the drawing]

FIGS. 1A to 1F are sectional views for explaining the construction method of the present invention, and FIGS. 2 to 4 are sectional views for explaining various conventional construction methods. 1... Residential lot, 2... House, 3... Tolerance, 4... Road surface, 5... Sewer main pipe, 6... Air impact perforator, 7... Hole, 9... Steel pipe, 10... Air Impact type perforator, 12... Screw auger, 13...
Core drill, 14...Guide roller, 15...Sewage installation pipe connection hole, 16...Sewage installation pipe, 17
...adhesive, 18...drainage basin.

Claims (1)

[Claims] 1. After driving an air percussion type drilling machine into the ground where a sewage installation pipe is to be installed until it reaches the main pipe, the drilling machine is moved backwards and pulled out, and then the steel pipe into which the sewage installation pipe can be inserted is filled with air. After driving the steel pipe until it reaches the main pipe using an impact drilling machine, the inside of the steel pipe is drained, and then a hole for connecting the sewage pipe is drilled in the main pipe, and the sewage pipe is inserted into the inside of the steel pipe. After the distal end thereof is fitted into the hole of the main pipe, the gap between the steel pipe and the sewage attachment pipe is filled with adhesive to fix both, and the sewage attachment pipe is connected to the drainage basin. Construction method for sewage pipes.