JPH0432200B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for burying a branch pipe, which connects a branch pipe with a smaller diameter than the main pipe to an existing main pipe such as a sewage pipe.

(Prior art) Main pipes buried underground, such as sewage pipes, are constructed underground using the shield method without excavating the ground. When branching or extending a branch, this is often done using the cut-and-cover method.

For this reason, there are problems in that it not only becomes an obstruction to traffic, but also takes a long time to construct and requires a large construction area.

For this purpose, for example, as described in Japanese Patent Application Laid-Open No. 56-20246, a casing tube is connected to the main pipe while drilling from the ground to the main pipe with a boring machine, and a branch pipe is inserted into this casing tube. A method was developed in which the lower end was connected and communicated with the main pipe.

(Problems to be Solved by the Invention) However, with this construction method, if the casing tube is removed after construction of the branch pipe, there is a risk that a cavity will be created around the branch pipe and the road surface will sink. If the casing tube is left in place, the construction cost will be high and it will be uneconomical.Furthermore, it will not be possible to control the direction during excavation, making it impossible to construct branch pipes in curves or over long distances. Moreover, although it is possible to bury small-diameter branch pipes, it is difficult to bury relatively large-diameter branch pipes using a boring machine.

The present invention eliminates these problems and provides a method for burying branch pipes, which enables easy construction of curved lines and long distances in relation to the main pipe, even if the branch pipe has a relatively large diameter. It provides:

(Means for Solving the Problems) In order to achieve the above object, the branch pipe burying method of the present invention is configured such that the cutter, the drive device for the cutter, and the outer shell housing the drive device can be disassembled. Connecting the subsequent pipe to the shield excavator made of
Pressing in the buried pipe while excavating the ground from the starting shaft to the existing pipe using the shield excavator,
After the shield excavator reaches the existing pipe and penetrates into the existing pipe, the cutter and outer shell of the shield excavator are passed into the existing pipe and removed, and the drive device and trailing pipe of the shield excavator are moved to the starting shaft side. The feature is that when removed, a branch pipe consisting of a buried pipe is buried underground.

(Function) While correcting the direction of excavation of the shield excavator by jacking, the buried pipes following the shield excavator are pushed from the starting shaft side and propelled, and the buried pipes are successively added to the existing pipes. Construction will continue.

When the shield excavator reaches the existing pipe, the excavator penetrates into the existing pipe while drilling the peripheral wall of the existing pipe with the cutter etc. of the shield excavator, and also inserts the front end opening of the buried pipe into the existing pipe. Connect to the drilled hole.

By disassembling the shield excavator that has penetrated into the existing pipe into the cutter, the drive device for the cutter, and the outer shell that houses this drive device, the cutter and outer shell can be easily removed through the existing pipe, and the subsequent pipe can be removed. can be easily pulled out to the shaft side through the inside of the buried pipe and removed, and the cutter drive device can also be removed through the inside of the buried pipe.

In this way, a branch pipe consisting of a buried pipe can be installed with respect to the existing pipe.

(Example) An example of the present invention will be explained with reference to the drawings, while a branch pipe 3 having a smaller diameter than the existing pipe 2 is buried at a desired position underground for an existing pipe 2 buried in the ground 1. When connecting the branch pipe 3 to the existing pipe 2, first, a starting shaft 4 is excavated at a predetermined location on the ground, and a shield excavator 5 is installed inside the shaft 4.

As shown in FIGS. 1 and 2, this shield excavator 5 is provided with an inwardly facing flange portion 7 integrated with the front end opening edge of a cylindrical outer shell 6, and a partition wall 8 on the rear surface of the flange portion 7. The rotating shaft 11 of the cutter 10 is attached to a bearing 9 fixed at the center of the partition wall 8, with the front outer circumference fixed removably by bolts and nuts 9'.
The cutter 10 is rotatably supported, and the cutter 10 is detachably attached to the bearing 9 so that it can be replaced with the cutter 10.Furthermore, support frames 12, 12 are bored at several locations on the outer periphery of the rear surface of the partition wall 8 to face the rear. Then, the cutter 1 is moved by the support frame 12.
0 rotary drive device 13 is detachably supported.

Further, the outer shell 6 of this shield excavator 5 is divided into a plurality of slices and joined together removably with bolts and nuts 14, and the tips of mud feeding and draining pipes 15 and 16 are provided at the bottom of the partition wall 8. The openings are removably penetrated and connected so that the open ends of the mud feeding and draining pipes 15 and 16 face the back side of the cutter.

A seal 21 is attached to the rear end inner circumferential surface of the outer shell 6 of the shield excavator 5 configured as described above, and the front end outer circumferential surface of a trailing pipe 17 having a smaller diameter than the inner diameter of the outer shell 6 and a certain length. The subsequent pipe 1 is inserted through the
Bracket 2 fixed to several places on the inner peripheral surface of the front end of 7
Attach the direction adjustment jacks 18 to the frame 12 and attach the front ends of the rods of these direction adjustment jacks 18 to the frame 12.
While abutting and fixing to the receiving piece 23 provided at the rear end, a buried pipe 19 having approximately the same diameter as the outer diameter of the outer shell 6 and a certain length is fitted onto the trailing pipe 17, and the buried pipe 19 19
A seal 2 is placed between the inner circumferential surface of the tip end of the
4 is brought into sliding contact and interposed.

In this state, the cutter rotation drive device 13 of the shield excavator 5 is operated to excavate the ground 1 with the cutter 10, and the trailing pipe 17 and the buried pipe 19 are brought into contact with the rear end surfaces of the trailing pipe 17 and the buried pipe 19 on the side of the starting shaft 4. By pushing the pressing member 26 with the jack 20 whose reaction force is supported by the vertical shaft 4, these subsequent pipes 17
and propel the buried pipe 19 into the ground 1. In addition, the earth and sand excavated by the cutter 10 is transferred to mud feeding and draining pipes 15 and 1.
6 and discharge it to the ground.

In this way, the following pipe 17 of a certain length and the buried pipe 19
When the pipes are press-fitted into the ground, the front ends of the next succeeding pipe 17 and the buried pipe 19 are connected to the rear surface of these pipes, and these pipes are dug underground by the shield excavator 5 and pushed by the jack 20. This operation is repeated to bury the trailing pipe 17 and the buried pipe 19 connected in series to the rear end of the shield excavator 5 underground.

In the course of burying these pipes, if it is desired to correct the direction of excavation of the shield excavator 5 or if the pipes are to be bent, the direction correction jack 18 may be operated.

When the shield excavator 5 reaches the existing pipe 2, the cutter 10 cuts the circumferential wall of the existing pipe 2, and the shield excavator 5 is propelled while pushing from the shaft side to form a communication hole 25 in the circumferential wall of the existing pipe 2. Install through.

Note that this communication hole 25 is not excavated by the cutter 10 of the shield excavator 5, but after the shield excavator 5 reaches the existing pipe 2, it is cut into the existing pipe 2 by using an appropriate tool by inputting or other means. It may be excavated from inside.

From this state, the shield excavator 5 is further propelled together with the trailing pipe 17 and the buried pipe 19, and the shield excavator 5 is advanced into the existing pipe 2, and the buried pipe 1
Insert the front end surface of 9 into the communication hole 25 (Fig. 3),
A filler such as cement bentonite or mortar is filled between the inner peripheral surface of the communication hole 25 and the outer peripheral surface of the buried pipe 19 to connect and fix the buried pipe 19 to the existing pipe 2. and cutter 10
is separated from the outer shell 6.

In addition, if the length of the shield excavator 5 entering the existing pipe 2 is larger than the inner diameter of the existing pipe 2, the outer shell 6 is removed by removing the bolts and nuts 14 and divided into several parts and stored inside the existing pipe 2. do.

When the branch pipe 3 consisting of a series of buried pipes 19 communicating from the starting shaft 4 to the existing pipe 2 is buried, the cutter 10 and outer shell 6 of the shield excavator 5 are left in the existing pipe 2, and the branch It leads into the pipe 3 and pulls out the mud feeding/discharging pipes 15, 16 and the trailing pipe 17 to the vertical shaft 4 side, and also connects the drive device of the shield excavator 5 to the vertical shaft 4.
Remove it to the side (see Figure 4).

Further, the cutter 10 and outer shell 6 of the shield excavator 5 inside the existing pipe 2 are passed through the existing pipe 2 and removed.

In addition, in the above embodiment, the trailing pipe 17 is transported from the shield excavator 5 to the vertical shaft 4 in the same way as the buried pipe 19.
By pressing the rear end surface of the trailing pipe 17 at the rearmost position, the propulsive force is transmitted from the trailing pipe 17 at the frontmost position to the shield excavator 5 via the direction correction jack 18. However, as shown in FIG. 5, the tip of one trailing pipe 17 is connected to the rear end of the shield excavator 5 via the direction control jack 18, and the outer peripheral surface of the trailing pipe 17 is It may be fixed to the front end inner circumferential surface of the buried pipe 19 by welding or the like. With this configuration, the rear end surface of the rearmost buried pipe 19 is pressed by the jack 20 from the vertical shaft side. A series of buried pipes 1
9 may be transmitted to the shield excavator 5 via the direction correction jack 18.

In this case, a branch pipe 3 consisting of a series of buried pipes 19
After the pipe is buried, the portion of the trailing pipe 17 protruding into the communication hole 25 that is fixed to the buried pipe 19 is separated by cutting or the like.

In addition, when a steel pipe is used as the buried pipe 19, a branch pipe may be constructed by inserting a PVC pipe or the like inside the steel pipe, and filling the gap between the two with mortar to integrate them.

(Effects of the Invention) As described above, according to the branch pipe burying method of the present invention, a shield excavator in which the cutter, the drive device for the cutter, and the outer shell in which the drive device is installed can be disassembled can be used. A subsequent pipe is connected via jacks, and a buried pipe is fitted onto the subsequent pipe, and the shield excavator presses in the buried pipe while excavating the ground from the starting shaft toward the existing pipe, and performs shield excavation. After the machine reaches the existing pipe and penetrates into the existing pipe, the cutter and outer shell of the shield excavator are removed through the existing pipe, and the drive device and trailing pipe of the shield excavator are removed to the starting shaft side. Since it is characterized by burying a branch pipe consisting of a buried pipe underground, even if the buried pipe has a relatively large diameter, it can easily bury the existing pipe while following the shield excavator. In addition, it is possible to perform curved construction and long-distance construction of underground pipes while controlling the direction of the shield excavator using jacks. Furthermore, it is possible to install branch pipes made of buried pipes between the vertical shaft and existing pipes. Once buried, the shield excavator reaches the existing pipe and penetrates into the existing pipe. Because the shield excavator's outer shell and cutter, which are difficult to remove through the buried pipe, can be easily removed through the existing pipe, the shield excavator's drive device and trailing pipe can be removed through the buried pipe. It can be smoothly removed to the drag side, improving work efficiency.

In addition, the front end opening of the buried pipe can be easily connected and connected by fitting into the hole of the existing pipe drilled by a shield excavator, etc., and the outer peripheral surface of the buried pipe can support the ground. Therefore, it is possible to eliminate subsidence of the road surface, etc.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a simplified vertical side view showing the construction state, FIG. 2 is a vertical front view taken along line A-A in FIG. 1, and FIGS. 3 and 4 are the construction. FIG. 5, which is an explanatory diagram of the process, is a simplified longitudinal sectional side view showing another embodiment of the present invention. 1... Ground, 2... Existing pipe, 3... Branch pipe, 4
... Vertical shaft, 5... Shield excavator, 6... Outer shell,
8... Bulkhead, 10... Cutter, 13... Drive device, 17... Trailing pipe, 18... Jacket, 19...
...Buried pipe.

Claims (1)

[Claims] 1 Connect a trailing pipe via a jack to a shield excavator, which has a cutter, a drive device for the cutter, and an outer shell housing the drive device that can be disassembled, and fit an underground pipe into the trailing pipe. , the shield excavator moves from the starting shaft toward the existing pipe, press-fits the buried pipe while excavating the ground, and after the shield excavator reaches the existing pipe and penetrates into the existing pipe, the cutter of the shield excavator A method for burying a branch pipe, characterized in that a branch pipe consisting of a buried pipe is buried underground by removing the outer shell through the existing pipe and removing the drive device of the shield excavator and the following pipe to the starting shaft side. .