JPH0437892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a method of laying a connecting pipe that communicates rainwater or a sewage basin with a sewer main pipe.

(Conventional technology) The cut-and-cut method is usually used to install connection pipes to sewer mains. When using this open-cut construction method, not only is the construction work relatively large-scale, but there is also the risk of inducing ground subsidence, especially if the ground is soft and has a high groundwater level.

JP-A-1988-1 solved these difficulties.
"Sewerage pipe installation method" disclosed in No. 68450
Specifically, a boring machine is installed over the work hole in accordance with the installation angle of the installation pipe that connects to the sewer main pipe, and then a metal crown is attached to the tip of the first installation pipe. , fix the collar to the outer circumferential surface near the tip of the mounting tube,
Attach a rotating rod of a boring machine to the rear end of the first mounting pipe, rotate it and push it into the soil in the installation direction, and at the same time, install it by passing it through the rotating rod using a water pump while drilling the hole. After supplying water into the pipe and burying the rear end of the first installation pipe in the soil, remove the rotary rod from the first installation pipe and remove the rear end of the first installation pipe. Connect the tip of the second attachment pipe, attach a rotating rod to the rear end of the second attachment pipe, and submerge the second attachment pipe in the same way as the first attachment pipe. After burying the n-th installation pipe in the soil in order, and drilling a through hole in the main pipe with a metal crown, the collar fixed to the tip of the first installation pipe is inserted into the main pipe. Push the metal crown until it stops against the through hole, then inject grout into the gap between the wall of the drilled hole in the soil and the outside surface of the pipe, and finally remove the metal crown protruding into the main pipe. The pipe is cut to match the inner surface of the main pipe, and the gap between the through hole and the collar is closed with adhesive.

(Problems to be solved by the invention) However, in the case of the above-mentioned "sewerage pipe installation method", from the first to the nth
Since it is necessary to push the material into the drilled hole sequentially until it reaches the main pipe, it is necessary to stop the pushing operation using the boring machine each time, and this process is repeated. workability is significantly inferior due to
In addition to underground excavation, the metal crown for drilling through holes in the main pipe is attached to the tip of the attachment pipe itself, and this is done while rotating the multiple attachment pipes themselves, which are connected together. Therefore, a certain amount of unreasonable stress is applied to the parts of the mounting pipe that are weak due to the material, causing partial cracks or even damage.As a result, it is difficult to achieve high precision and appropriate mounting to the main pipe. is difficult.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned difficulties of the prior art. , drilling a mounting hole toward the sewer main pipe with a core tube attached to the tip of the rotating spindle rod of the boring machine, and inserting the spindle rod into a connecting pipe corresponding to the depth of the mounting hole; A spacer is interposed between the spindle rod and the joint portion of the connecting pipe to an extent that does not impede rotation of the spindle rod, and a core tube is attached to the tip of the spindle and inserted into the above-mentioned mounting hole, and further rotated. Drilling a connection hole in the sewer main pipe using the spindle rod and core tube, inserting and fixing the tip of the connection pipe into the connection hole, removing the core tube from inside the sewer main pipe, pulling up the spindle rod and spacer, and This invention relates to a construction method for installing a main sewer pipe connecting pipe, which comprises a step of injecting a filler such as cement milk between the connecting pipe and the mounting hole to fix it.

(Example) The specific content of the present invention will be explained below based on an illustrated example. 1 is the ground surface, 2 is a working hole drilled near the rainwater or sewage basin on the ground surface, and 3 4 is the sewer main pipe buried underground, 4 is the boring machine installed above the working hole 2,
Reference numeral 5 indicates a spindle rod of the boring machine, 6 a core tube attached to the tip of the spindle rod, and 7 a connecting pipe connected to the sewer main pipe 3.

The boring machine 4 is installed with its spindle 4a facing the planned opening of the sewer main pipe 3. The setting angle of the spindle 4a in this case is the distance After measuring the distance Y to the axis of the main pipe 3, the spindle angle is α, and it is determined by α=(tan α=Y/X). (See Figure 1) A spindle rod 5 is inserted into the spindle 4a whose angle is set, and a core tube 6 is attached to the tip of the rod. Excavate in sequence toward pipe 3 and open mounting hole H.

Incidentally, at this time, if bentonite water is circulated through the core tube 6 through the spindle rod 5, the excavation work will be made easier.

The connecting pipe 7 inserted into the mounting hole H is connected to the opened connecting pipe 7 as shown in detail in FIG.
A plurality of connecting pipes 7 are connected in advance on the ground so that the length is approximately equal to the distance from the opening of the pipe to the main sewer pipe 3, and a connecting stopper 8 is provided at the lower part of the pipe. Core cube 6a
and is placed on the flange 11 of the bottom plate 9, which is attached via bearings 10, 12 and a reinforcing hinge 13, and the lower end of the spindle rod 5 having the spindle is placed on the flange 11 of the bottom plate 9. It is inserted in this state.

Furthermore, between the spindle rod 5 and each joint portion 7a of the connecting tube 7, a ring-shaped bearing 1, for example, is provided to the extent that rotation of the spindle rod 5 is not hindered.
A relatively elastic spacer 14 is interposed by means such as interposing a spacer 5 .

Note that 16 indicates the upper plate.

(Function) In the configuration of the above-described embodiment, first, the core tube 6 is attached to the tip of the spindle rod 5, and while rotating it, the installation hole H is drilled toward the sewer main pipe 3 (see Fig. 2). After completing drilling of mounting hole H, spindle rod 5
After raising the core tube 6 to the ground with the core tube 6 attached, the core tube 6 is replaced with another core tube 6a, and the bottom plate 9 having the reinforcing hinge 13 is attached thereon, and the bottom plate 9 is connected to the flange 11 of the bottom plate 9 in advance. A state in which the connecting tube 7 of a predetermined length is placed on the connecting tube 7, a spacer 14 is interposed between the spindle rod 5 and each joint portion 7a of the connecting tube 7, and an upper plate 16 is attached to the upper end. After inserting the spindle rod 5 into the spindle 4a by inserting it into the above-mentioned mounting hole H (see Fig. 4), insert the core tube 6a at the tip.
A connecting hole 3a is drilled in the sewer main pipe 3, and at the same time, the tip of the connecting pipe is inserted into the connecting hole until the outer circumferential surface of the stopper 8 is completely crimped. (See FIG. 5) In this case, if the core tube 6a is used for excavating the mounting hole H from the beginning, there is no need to replace it when inserting the connecting pipe 7 into the mounting hole.

Next, the core tube 6a is removed from the spindle rod 5 from inside the sewer main pipe, and at the same time, the rod is raised above ground, and the protruding portion of the connecting pipe is cut and removed from the inside of the sewer main pipe 3, and the water is stopped with adhesive.

Further, a filler such as cement milk is injected into the gap between the connected connecting pipe 7 and the mounting hole H to fix it, thereby completing the installation work.

(Effects of the Invention) As described above, the present invention is a method in which a plurality of attachment pipes are connected to a predetermined length on the ground in advance, and the pipes are inserted into the attachment hole and attached to the sewer main pipe. There is no need to interrupt the pushing operation using the boring machine each time the installation pipe is connected.
Work efficiency is significantly improved, and in addition to underground excavation, the core tube for opening the installation hole for the sewer main pipe is attached to the tip of the spindle rod instead of the installation pipe, and multiple rods are connected together. Since the pipe itself is not rotated, it is possible to accurately and properly attach it to the sewer main pipe without damaging it, regardless of the material of the attached pipe, including concrete pipes or ceramic pipes that have been commonly used in the past. becomes.

[Brief explanation of drawings]

Each of the figures shows the procedure for installing a sewer main connection pipe, which represents one embodiment of the present invention. Figure 3 is a partially enlarged vertical cross-sectional view showing how the mounting pipe is attached to the spindle rod; Figure 4 is a cross-sectional view of the stratum showing how the mounting pipe is inserted into the mounting hole; Figure 5 shows strata cross-sectional views showing how the attachment pipes are attached to the sewer main pipe. 2... Working hole, 3... Sewer main pipe, 4... Boring machine, 5... Spindle rod, 6,6
a... Core tube, 7... Connection pipe, 8... Connection stopper, 9... Bottom plate, 14... Spacer,
16...Upper board.

Claims (1)

[Claims] 1. The process of installing a boring machine in accordance with the direction in which the connecting pipe is buried, the process of drilling a mounting hole toward the sewer main pipe using a core tube attached to the tip of the rotating spindle rod of the boring machine, and the process of drilling the mounting hole in accordance with the direction in which the connecting pipe is buried, and determining the depth of the mounting hole. The above-mentioned spindle rod is inserted through the connecting pipe corresponding to the above, and a spacer is interposed between the joint part of the spindle rod and the connecting pipe to an extent that does not hinder the rotation of the spindle rod, and a core tube is inserted at the tip of the spindle. and inserting it into the mounting hole, further drilling a connecting hole in the sewer main pipe with a rotating spindle rod and core tube, and inserting and fixing the tip of the connecting pipe into the connecting hole, A construction method for installing sewer main connection pipes, which consists of the steps of removing the core tube from inside the main sewer pipe, pulling up the spindle rod and spacer, and injecting a filler such as cement milk between the connection pipe and the mounting hole to fix it.