JPS6156734B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewerage pipe installation method for connecting a sewer basin, a rainwater basin, and a main pipe.

Generally, when installing an attachment pipe to a main pipe buried deep in soft ground with a high groundwater level, it is important to prevent damage to houses etc. due to ground subsidence.
This is an extremely important issue.

However, conventionally, the open-cut method has been used to install the attachment pipe to the main pipe, and when this method is used in soft ground with a high groundwater level,
With excavation, it is unavoidable to pump up a large amount of groundwater, and because the soil is highly compressible, it directly leads to ground subsidence, and there are often situations where the surrounding ground subsides and existing structures are damaged as a result. Ta. In addition, this construction method also involved various problems in the construction of the mountain retainers. As another conventional example, when connecting a mounting pipe to a buried sewer pipe, the horizontal distance of the sewer pipe and the starting point of the horizontal distance are used as a reference point, and the height difference corresponding to the horizontal distance is determined in advance. After confirming the connection position of the attachment pipe, use a boring machine to feed the attachment pipe directly toward the location, and then drill the sewage pipe using the rotary excavation means attached to the tip of the attachment pipe. There is a method for attaching an attachment pipe to a sewer pipe in which the attachment pipe is connected to the opening (Japanese Patent Laid-Open Publication No.
(See Publication No. 56-3728). This conventional mounting method involves setting the boring machine at its approach angle, and then sequentially adding the mounting pipes to be connected to the head of the boring machine according to their length. With the crown at the top, dig through the soil while rotating it, push it forward until the tip hits the sewer pipe, push it further, and the metal crown at the tip opens the opening at the desired location of the sewer pipe, and then attach it once. After lifting the pipe slightly and driving one or more anchors into the wall of the opening from inside the sewer pipe, if you pull down the attached pipe above the anchor, will the attached pipe be able to be received by the anchor? Alternatively, after opening, cement is solidified into a doughnut-like shape at a certain thickness to the extent that the mounting pipe can be placed on the part to form a flange-like pedestal. (See column 4, line 8 to column 6, line 5). However, in this conventional construction method, after opening the sewer pipe with this metal crown,
Once the installation pipe has been lifted up a little, it is necessary to provide a means of receiving the installation pipe, such as an anchor, at the opening, so in the case of soft ground with a high groundwater level, earth and sand may pass through the opening of the sewer pipe during that time. A large amount of dirt flows into the sewer pipe, and the interior of the sewer pipe is immediately blocked with a large amount of earth and sand, which poses problems such as extremely dangerous work.

As a result of many years of research, the present inventors have found that when using a boring machine to dig a small-scale well, such as a groundwater observation well, without using the conventional cut-and-cut method, the casing tube is first lowered, and then the hard chloride This method was inspired by the method of inserting a vinyl pipe into the tube and then pulling up the casing tube.The method of the present invention connects the mounting pipe to the metal crown from the beginning without using the casing tube at all. This is similar to the conventional method in that the mounting pipes are rotated together with the metal crown using a boring machine, and the mounting pipes are connected to each other by being pushed in sequentially until they reach the main pipe, but at the same time, during drilling, A water pump sends water into the attached pipe, conversely replenishing groundwater. At the same time, a through hole is drilled in the main pipe, and at the same time, the tapered collar of the attached pipe prevents the inflow of earth and sand into the main pipe. We developed a method for connecting to pipes.

However, this invention aims to solve the problem of ground subsidence and damage to houses, etc. under extremely poor location conditions, such as installing an attachment pipe to a main pipe buried deep in soft ground with a high groundwater level as described above. This was done with the main purpose of suppressing the occurrence of the problem, and when installing the attachment pipe to the main pipe,
Unlike conventional construction methods, a large amount of earth and sand flows into the main pipe,
It completely eliminates the extremely dangerous situation in which the main pipe is immediately blocked with earth and sand, and completely prevents the flow of earth and sand into the main pipe, making it safe and easy to install. Furthermore, the object of the present invention is to provide the general public with an economical sewerage pipe installation method that not only greatly shortens the working time but also produces less vibration and noise.

An embodiment of the present invention will be described below with reference to the drawings.

First of all, work hole 2 in the vertical direction from the ground surface 1.
excavate. The size of the working hole 2 varies depending on the construction conditions, but in this example, it is 1.00 m in diameter and 1.00 m in depth, and a corrugated pipe 3 of 100 mmφ is embedded in the hole and secured. Next, a pedestal 4 is installed on the ground so as to be located directly above the working hole 2. To install the boring machine 7 on this pedestal 4,
Set the occupied position of the main pipe 5 and the angle of the mounting pipe 6 from the earth cover, and install the boring machine 7 on the mount 4 accordingly.
fix it on top. The mounting pipes 6 are usually made of hard vinyl chloride, and the mounting pipes 6 are joined together to prepare a number of pipes with a length corresponding to the distance between the main pipe 5 and the rainwater basin or sewage basin 8. However, since the multiple mounting pipes 6 are not connected to each other before being buried in the soil, 1
Leave the book alone. 1st,
Each of the second, ... nth mounting pipes 6 has female and male threads 6a and 6b carved at both ends thereof,
It should be able to be freely joined to other members. The first mounting tube 6 has a cylindrical metal crown 9 implanted with diamond or a super hard alloy screwed onto its tip, and an adhesive is applied to the outer circumferential surface near the tip of the first mounting tube 6. The collar 10 is secured to the rear end of the mounting tube, and a head 12 having a screw hole 12a into which a rotating rod 11 (to be described later) is screwed is screwed to the rear end of the mounting tube. By making the outer circumferential surface of the collar 10 tapered with a tapered tip, the metal crown 9 closes the through hole 16 drilled in the main pipe 5, completely preventing the inflow of earth and sand into the main pipe 5. can do. The rotating rod 11 of the boring machine 7 is set at the same angle as the mounting angle of the mounting pipe 6,
The tip thereof is screwed into the screw hole 12a of the head 12, and the rotary rod 11 and the first attachment tube 6 rotate together. The rear end of the rotary rod 11 is connected to a water supply hose 13, and this hose is connected to a water supply pump 14, which pumps up water from a water tank 15 and passes it through the rotary rod 11 to the first attachment pipe. 6, and is discharged from the tip of the attached pipe into the soil and into the voids in the borehole wall, where it is replenished with groundwater. Water is fed into the first attachment pipe 6 while the attachment tube is being rotated and the tip is pushed into the soil in the direction of the installation angle. When the rotary rod 11 and the attachment tube 6 rotate together, a hole slightly larger than the outer diameter of the attachment tube 6 is drilled by the metal crown 9. Then, the first mounting pipe 6 is pushed into the soil while rotating toward the installation angle, and when the first mounting pipe 6 is pushed into the soil leaving behind the rear end, the rotating rod 11 and the head 12 are moved to the first position. from the rear end of the mounting tube 6. If necessary, use a suitable jig (not shown) to remove the sludge clogged in the installation pipe 6.
Remove by. After removing this sludge, the rear end portion of the first attachment tube 6 and the tip portions of the second attachment tube 6 are watertightly joined together via an adhesive. Next, attach the rotary rod 11 to the rear end of the second attachment pipe 6, and bury the second attachment pipe 6 in the soil in the same way as the first attachment pipe 6. The second mounting pipe 6 is buried in the soil. When the first attachment pipe 6 is successively pushed in and the metal crown 9 at its tip hits the main pipe 5, a through hole 16 is bored in the main pipe 5 by the metal crown, and the through hole is inserted into the through hole. The tip of the first attachment tube 6 is pushed in, and at the same time, the tapered surface of the collar 10 enters the through hole 16 in a wedge shape until it abuts and stops. Next, a rod (not shown) is inserted into the gap between the drilled wall 17 in the soil and the outer surface of the attachment pipe 6, and a grout 18 suitable for the ground to be injected, such as cement milk, is injected. Finally, the metal crown 9 protruding into the main pipe 5 is removed, and the first attachment pipe 6 protruding into the main pipe 5 is cut to match the inner surface of the main pipe 5. Then, the gap between the through hole 16 and the collar 10 is closed with adhesive to prevent the attachment tube 6 from coming off and to prevent water from leaking from the gap. With a tapered collar like this example, it is normal to apply caulking from the inside of the main pipe with an adhesive once the collar comes into contact with the main pipe and stops. For this purpose, a rubber ring or wide rubber 19 may be attached to the lower part of the tapered surface 10a as shown in FIG.

After the attachment pipe 6 is attached to the main pipe 5 using this construction method, the bent pipe 21 is joined to the upper end of the n-th attachment pipe 6, and the bent pipe is connected to a rainwater basin or a sewage tank by a conventional method. Attach it to box 8 and complete the installation work.

As can be seen from the above description, this invention involves installing a boring machine over a working hole in accordance with the installation angle of the installation pipe connected to the main sewer pipe, and then
When a metal crown is attached to the tip of the second installation tube, a
A tapered collar with a tapered outer circumferential shape is fixed,
Attach a rotary rod of a boring machine to the rear end of the first mounting pipe, and push the first mounting pipe into the ground in the direction of the mounting angle while rotating the first pipe. After supplying water into the installation pipe through the first installation pipe and burying the first installation pipe in the soil, leaving the rear end of the first installation pipe, move the rotating rod to the first installation pipe.
removing it from the first mounting pipe, joining the rear end of the first mounting pipe and the tip of the second mounting pipe, and attaching a rotating rod to the rear end of the second mounting pipe,
In the same way as the first installation pipe, the second installation pipe is buried in the soil, and then the nth installation pipe is buried in the soil in order, and a through hole is drilled in the main pipe with a metal crown. After installation, push the collar fixed to the tip of the first attachment pipe until the tapered surface hits the through-hole of the main pipe and stops, and then grout the gap between the borehole wall in the soil and the outside surface of the attachment pipe. Finally, remove the metal crown that protrudes into the main pipe, cut the mounting pipe that protrudes into the main pipe to match the inner surface of the main pipe, and
This is a sewer pipe installation method that uses adhesive to close the gap between the through hole and the collar.
It has the following features.

(i) Sediment inflow into the main pipe is prevented.

The mounting pipe is rotated with a boring machine and buried in the soil, and a metal crown attached to the tip of the mounting pipe is used to drill a hole in the main pipe.At the same time, the tip of the mounting pipe is pushed into the hole, and the mounting pipe The tapered collar fixed to the outer circumferential surface of the tip of the pipe wedges into the hole and closes it, making it possible to install the pipe in soft ground with a high groundwater level, as with conventional construction methods. Once lifted from the through hole, a large amount of sediment will flow into the main pipe through the through hole of the main pipe and immediately block the main pipe, which will prevent the inflow of earth and sand into the main pipe. It has the excellent effect of being extremely safe and without any operational hazards.

(ii) Effective in preventing ground subsidence.

When constructing pipes using the conventional cut-and-cut method, pumping up groundwater is usually unavoidable in areas where the groundwater level is high. Moreover, in the case of a soil layer containing corrosive substances, consolidation settlement occurs due to a drop in the groundwater level due to its high compressibility.However, according to the method of the present invention, the boring machine itself has the function of digging fresh water when drilling a hole. On the contrary, it will be replenishing the groundwater, and consolidation settlement due to dewatering will not be a problem. Although loosening of the ground may be a cause of ground subsidence, we have adopted a method of filling the gap between the drilled wall of the metal crown and the outer circumferential surface of the attached pipe with grout after pipe installation. Coupled with the fact that the time required for the work to complete the installation is extremely short, there is no need to loosen the ground. As a result, the conventional situation of surrounding ground subsidence and damage to existing structures is eliminated.

(iii) Working time is short.

In the case of soft and clayey soil, it is possible to drill holes in 5 to 10 minutes per 1.0 m of hole length. The drilling time for the main pipe depends on the pipe thickness, but it can be completed in about 30 to 45 minutes. Therefore, when compared with the conventional open cut method,
The greater the excavation depth, the more advantageous it is in terms of working time.

(iv) Low noise and vibration.

When the soil conditions are poor and the excavation depth is deep, conventional open-cut construction methods have no choice but to place emphasis on the retaining process, which results in vibration and noise when driving sheet piles. The noise and vibration produced by the engine are relatively minor.

(v) Economical.

Because there is less earthwork and the work time is shorter, it is more efficient and cheaper than conventional cut-and-cover methods.

(vi) In addition, the method of the present invention not only fully demonstrates its effectiveness in places where excavation is difficult, such as in places with heavy traffic, but also
This will be utilized both directly and indirectly for dealing with residents when construction begins and for safety during construction.

[Brief explanation of the drawing]

Fig. 1 is a construction drawing showing one embodiment of this invention, Fig. 2 is a drawing of completed construction, Fig. 3 is a sectional view of the first mounting pipe with a metal crown and head attached, and Fig. 4 is a drawing of the second installation pipe. Figure 5 is a cross-sectional view of the tapered collar fitted with a rubber ring to prevent it from coming off. 2... Working hole, 4... Frame, 5... Main pipe, 6...
... Mounting pipe, 7 ... Boring machine, 9 ... Metal crown, 10 ... Collar, 11 ... Rotating rod, 14 ... Water pump, 16 ... Through hole, 17 ...
...bore wall, 18...grout.

Claims (1)

[Claims] 1 Install the boring machine over the work hole according to the installation angle of the installation pipe that connects to the main sewer pipe,
Next, a metal crown is attached to the tip of the first mounting pipe, and a tapered collar with a tapered outer circumferential shape is fixed to the outer circumferential surface near the tip of the first mounting pipe, and a boring is performed on the rear end of the first mounting pipe. Attach the rotary rod of the machine and push the first attachment pipe into the soil in the installation direction while rotating it. At the same time, during drilling, water is sent through the rotary rod into the attachment pipe using a water pump, and the first attachment pipe is rotated and pushed into the installation direction. After burying the rotary rod in the tube, leaving the rear end of the first attachment tube in place, remove the rotating rod from the first attachment tube, and insert the rear end of the first attachment tube and the tip of the second attachment tube. A rotary rod is attached to the rear end of the second mounting pipe, and the second mounting pipe is buried in the soil in the same way as the first mounting pipe. After burying the first attachment pipe in the soil and drilling a through hole in the main pipe with a metal crown, the tapered surface of the collar fixed to the tip of the first installation pipe wedges into the through hole of the main pipe. Push it in until it stops, then inject grout into the gap between the borehole wall in the soil and the outside surface of the attachment pipe.Finally, remove the metal crown protruding into the main pipe, and insert the attachment pipe that protrudes into the main pipe into the main pipe. A sewerage pipe installation method characterized in that the pipe is cut to fit the surface and the gap between the through hole and the collar is closed with adhesive.