JPS5968450A - Construction of attaching pipe of drainage - 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 construction method for installing a sewerage pipe connecting a sewage basin, a rainwater basin, and a main pipe.

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

However, conventionally, the open-cut method has been used to install attachment pipes to the main pipe, and when this method is used in soft ground with a high groundwater level, it is possible to avoid pumping up a large amount of groundwater due to excavation. First, because the soil is highly compressible, it directly leads to ground subsidence, which often causes the surrounding ground to subside and damage existing structures. In addition, this construction method also involved various problems in the construction of the mountain retainers.

As a result of many years of research, the present inventors have found that when using a boring machine to dig a small-scale external 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 a casing tube at all. , Rotate the mounting pipes together with the metal crown using a boring machine, and connect the mounting pipes by pressing them one after another until they reach the main pipe.At the same time, during drilling, water is sent into the mounting pipes by a water pump, and the A method was developed in which the attached pipes are connected to the main pipe in order to replenish groundwater.

However, this invention aims to solve the problem of how to prevent 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 noise, and the construction of the attached pipe is simple, and the work time can be greatly shortened, as well as being an economical way to install sewer attached pipes with less vibration and noise. The goal is to provide construction methods to the general public.

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

First, a working hole 2 is excavated vertically from the ground surface 1. The size of the working hole 2 varies depending on the construction conditions, but in this example, it is 1-00 m in diameter + 1.00 m in depth, and when a corrugated pipe 3 of 100 (100 (1) is embedded in the hole and held in place) Next, install a pedestal 4 on the ground surface so as to be located directly above the working hole 2.In order to install the boring machine 7 on this pedestal 4, the mounting pipe 6 should be placed at the occupied position of the main pipe 5 and the mounting pipe 6 at an angle from the upper cover. is set, and the boring machine 7 is fixed on the pedestal 4 accordingly.The mounting pipes 6 are usually made of hard vinyl chloride, and the mounting pipes 6 are joined together to connect the main pipe 5 to the rainwater basin, Prepare the number of pipes corresponding to the length required for the distance between the pipes and the sewage basin 8, but before burying the plurality of installation pipes 6 in the soil, do not connect them to each other and leave them individually. Each of the first, second,... nth mounting pipes 6 has female and male threads 6a and 6b carved into both ends so that they can be joined to other members. When a cylindrical metal crown 9 in which diamond or cemented carbide is implanted is screwed onto the tip of the first attachment tube 6, adhesive will be applied to the outer peripheral surface near the tip of the attachment tube. A head 12 having a screw hole 12a into which a rotating rod 11 (to be described later) is screwed is screwed onto the rear end of the mounting tube.
By making the outer peripheral surface shape tapered, installation to the main pipe 5 becomes easier.

The rotating rod 11 of the boring machine 7 is set to have the same angle as the mounting angle of the mounting pipe 6, and its tip is screwed into the screw hole 12a of the head 12, so that the rotating rod 11 and the first mounting pipe 6 are connected to each other. rotate as one. The rear end of the rotating rod 11 is connected to a water supply hose 13, which is connected to a water pump 14, and the pump pumps up water in a water tank 15, passing the water through the rotating rod 11 to the first mounting 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 its tip is pushed into the soil in the direction of the installation angle. When the rotating 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 the rear end of the mounting pipe 6 intact, the rotating rod 11 and the head 12 are inserted into the first from the rear end of the mounting tube 6. If necessary, the sludge clogged in the attachment pipe 6 is removed using a suitable jig (not shown). After removing this sludge, the rear end of the first attachment pipe 6 and the second attachment pipe 6 are
The tips of the two are watertightly joined together using adhesive. Then, the rotating rod 11 is attached to the rear end of the second attachment pipe 6, and the second attachment pipe 6 is also buried 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 pushed in one after another 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.
The tip of the first attachment tube 6 is pushed into the through hole until the collar 10 hits the through hole 16 and stops. Next, a rod (
(not shown) and inject a grout 18 suitable for the ground to be injected, such as cement milk. 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 being pulled out and to prevent water from leaking from the gap. When using a tapered collar as in this example, it is normal to apply caulking from the inside of the main pipe with adhesive once the collar comes into contact with the main pipe. In order to strengthen prevention and leakage, a rubber ring or wide rubber 19 may be attached to the lower part of the tapered surface 1oa as shown in FIG.

Further, when using a normal collar without a taper, it is necessary to attach the fixing joint 20 from the inside of the main pipe 5 as shown in FIG. 6 ayb.

After the attachment pipe 6 is attached to the main pipe 5 by this construction method, the bent pipe 21 is joined to the upper end of the n-th attachment pipe 6,
The bent pipe is attached to the rainwater basin or sewage basin 8 by a conventional method to 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 that connects to the sewer main, and then attaching a metal crown to the tip of the first installation pipe. Then, a collar is fixed to the outer circumferential surface near the tip of the first attachment pipe, and a rotary rod of a boring machine is attached to the rear end of the first attachment pipe, and the first attachment pipe is rotated and drilled into the soil. At the same time as it is pushed in the direction of the installation angle, a water pump is used to feed water through the rotating rod into the installation pipe while drilling the hole, leaving the rear end of the first installation pipe in the soil, and then rotating. Remove the rod from the first mounting pipe, and connect the rear end of the first mounting pipe with the second
Join the tip of the second mounting pipe, attach a rotating rod to the rear end of the second mounting pipe, and bury the second mounting pipe in the soil in the same way as the first mounting pipe. Then, after burying the nth installation pipe in the soil in order, and drilling a through hole in the main pipe with a metal crown, the casing fixed to the tip of the first installation pipe is inserted 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. This is a sewerage pipe installation method in which the pipe is cut to fit the surface and the gap between the through hole and the collar is closed with adhesive.
It has the following features.

(1) Effective in preventing ground subsidence.

When installing 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. Therefore, groundwater will be replenished, and consolidation settlement due to dewatering will not be a problem. Although loosening of the ground may be a cause of ground subsidence, the 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 eliminates the possibility of loosening of the ground. As a result, the conventional situation where the surrounding ground subsides and existing structures are damaged is eliminated.

(11) Working time is short.

In the case of soft/cohesive soil, drilling time per 1.0 m of drilling length is 5 ~
Holes can be drilled in 10 minutes. The main pipe can be drilled in about 30 to 45 minutes, depending on the thickness of the pipe. Therefore, when compared with the conventional open-cut method, the deeper the excavation depth, the more advantageous it is in terms of working time.

(iii) Less noise and vibration.

When the soil conditions are poor and the excavation depth is deep, conventional open-cut construction methods have to place more emphasis on the retaining process, which results in vibration and noise when driving sheet piles. The noise and vibration generated by the system are relatively minor.

(IV) It is economical.

It is highly efficient as there is less earthwork and the work time is short; it is also cheaper than conventional open-cut construction methods.

(V) In addition, in places where excavation is difficult, such as in places with heavy traffic, the construction method of the present invention will not only fully demonstrate its power, but also be helpful in dealing with residents at the start of construction and in construction work. It is directly and indirectly used for safety.

[Brief explanation of the drawing]

FIG. 1 is a construction drawing showing one embodiment of this invention. Figure 2 is a diagram of the completed construction, Figure 3 is a cross-sectional view of the first installation pipe with the metal crown and head installed, and Figure 4 is the second one.
Figure 5 is a cross-sectional view of the tapered collar with a rubber ring attached to prevent it from being pulled out, and Figure 6 arb is a cross-sectional view of the tapered collar with a rubber ring attached to it to prevent it from coming out. FIG. 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... Drilled wall, 18... Grout. Figure 1 Figure 2 Figure 7 Figure 4 Figure 3

Claims (1)

[Claims] Install the boring machine over the work hole according to the installation angle of the installation pipe that connects to the sewer main pipe, and then attach the metal crown to the tip of the first installation pipe. Attach a collar to the outer circumferential surface of the surrounding area, attach a rotary rod of a boring machine to the rear end of the first mounting pipe, and simultaneously push the first mounting pipe in the installation direction into the soil while rotating it. During drilling, a water pump was used to send water through the rotary rod into the attached pipe, and after burying the first attached pipe in the soil, leaving the rear end of the first attached pipe, the rotating rod was removed from the first attached pipe. , the rear end of the first attachment pipe and the tip of the second attachment pipe are joined, and the second
Attach a rotating rod to the rear end of the first mounting pipe, bury the second mounting pipe in the soil in the same way as the first mounting pipe, and then bury the nth mounting pipe in the soil in order. After drilling a through hole in the main pipe with a metal crown, push it in until the collar fixed to the tip of the first installation pipe hits the through hole in the main pipe, and then press it against the wall of the drilled hole in the soil. Inject grout into the gap between the outer surface of the mounting pipe, remove the metal crown protruding into the main pipe, cut the mounting pipe protruding into the main pipe to fit the inner surface of the main pipe, and remove the gap between the through hole and the collar. A sewerage pipe installation method characterized by blocking the pipe with adhesive.