JPH0475356B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a construction method for constructing a vertical shaft such as a manhole at the destination of an underground propulsion pipe buried underground, such as a hump pipe.

[Conventional technology]

Conventionally, as shown in Fig. 6, the conventional construction method for forming a reaching shaft is to drive steel sheet piles a into the ground and excavate the space surrounded by the steel sheet piles a to the depth reached by the underground propulsion pipe to create a shield. Create a space s, install shoring c in multiple stages within the space s,
There is a method in which a concrete bottom plate d is provided at the bottom and a manhole for receiving the underground propulsion pipe is constructed on top of this.

In addition, as another method, as shown in Fig. 7,
Prepare a casing g in advance, excavate a space h to reach the underground propulsion pipe, install the casing g in the space h, and backfill the gap between the casing g and the space h with earth and sand to replace the casing g. There is a method in which a support c is similarly provided after it is fixed, and a manhole is constructed within that space.

[Problem that the invention seeks to solve]

In the conventional construction method described above, it is necessary to backfill earth and sand beyond the casing space after excavating it and install various reinforcing members to form the shield, resulting in low work efficiency and high costs. It was hot.

The present invention eliminates the low efficiency and waste of work in conventional construction methods, and provides a construction method for safely forming a reaching shaft at low cost.

[Means for solving problems]

The present invention adopts a construction method in which a cylindrical steel pipe is used as a casing, the soil inside is excavated and buried while the casing is press-fitted, the cylindrical steel pipe is used as a buried pipe, and this buried pipe is propelled underground. The above problem was solved by using this as a receiving part for an underground propulsion pipe such as a humid pipe, and by constructing a manhole frame on top of this.

The present invention will be described below based on embodiments shown in the accompanying drawings.

Figure 1 shows the process of the construction method of the present invention.

In FIG. 1, reference numeral 1 indicates a buried pipe made of steel pipe with a generally circular cross section, which is buried as a receiving part of an underground propulsion pipe. It is press-fitted into the ground while being rotated using a press-in/extraction tool C and a rotating tool D provided at the tip.

The buried pipe 1 has a structure shown partially in cross section in FIG. Referring to the figure, a mounting port 2 for installing an underground propulsion pipe is provided on the lower side surface of a buried pipe 1, and a blind plate 3 is removably bolted to the mounting port 2 from the inner peripheral surface. Therefore, it remains closed until the press-fitting of the buried pipe 1 is completed. 4 is a cutting edge 5 made of hard steel with a hardened tip and a mounting base 6
This excavation member is removably bolted to the inner periphery of the tip of the buried pipe 1 at a plurality of locations, usually eight locations. Reference numeral 7 indicates a screw hole for connection with a connection casing, which will be described later.

FIG. 1 and 2 show, in cross section, the state in which the underground pipe 1 is press-fitted into the ground to a certain depth. In the same figure, 8
For example, the excavator is attached to a rope 9 suspended from the work arm B of the power shovel A shown in FIG. It has the function of carrying out.

The buried pipe 1 is press-fitted while excavating the earth and sand inside the buried pipe 1, and when the depth approximately shown in FIG. 1 is reached, the connecting casing 10 shown in FIG. 1 is connected to the upper end of the buried pipe 1. Press-fitting of the buried pipe 1 by the cutting edge 5 and the excavator 8 is continued.

FIG. 4 is a partially cross-sectional view showing the structure of the connection casing 10. The connecting casing 10 is composed of double steel pipes 101 and 102, and connecting members 11 and 12 are attached to the upper and lower ends of the pipes by welding. The connecting member 11 has a cross-sectional shape as shown in FIG.
02 and join the two pipes by welding to form a hollow double pipe.A step is provided on the outer periphery of the end of the pipe, and the upper tip of the buried pipe 1 is provided at the step. The structure is such that it can be removably connected to the buried pipe 1 by fitting into the connecting part and bolting from the inside to the connecting part screw hole 7 of the buried pipe 1. Further, another similar connecting member 12 is attached to the upper end of the connecting casing 10, and has a structure that can be connected to a second connecting casing 13.

FIG. 1 and 3 show a state in which the connecting casing 10 is connected to the buried pipe 1, and the earth and sand inside the casing are further excavated and press-fitted into the ground. Connected casing 10
When the press-fitting has progressed to the length of , the second connecting casing 13 held by the rotating tool D provided in front of the power shovel A is connected to the first connecting member 12 from above, and the tip is buried. The pipe 1 is press-fitted until the blind plate matches the propulsion level L of the underground propulsion pipe 16.

In this way, as shown in FIG. 1, when the buried position of the underground propulsion pipe provided in the buried pipe 1 is reached, the excavating member 4 having the aforementioned cutting edge 5 attached to the tip of the buried pipe 1 is removed. After removal, a chemical solution 14 is injected into the earth and sand around the buried pipe 1 to solidify it depending on the soil condition to fix the buried pipe 1, and concrete is poured at the bottom of the buried pipe to form a bottom surface 15.

Furthermore, as shown in FIG. 1, the blind plate 3 closing the attachment port 2 of the buried pipe 1 is removed, and an underground propulsion pipe 16 such as a Huum pipe is introduced into the attachment port 2.

Then, a manhole rising portion 17 is made of concrete using the buried pipe 1 as an external form.

Next, as shown in FIG. 16, the connecting bolts between the buried pipe 1 and the first connecting casing 10 are removed and a manhole frame 18 is constructed on the manhole rising portion 17, while the manhole frame 18 is constructed as shown in FIG. Using the press-in/extraction tool C and rotating tool D provided at the tip of the power shovel A, pull up the connecting casings 10 and 13, and while pouring concrete 19 into the space between the manhole frame and the ground, raise it above the road surface.
Install the manhole cover frame and complete the manhole construction.

〔Effect of the invention〕

The present invention makes it possible to create a vertical shaft for an underground propulsion pipe by simply excavating earth and sand in a space with the minimum cross-sectional area required for constructing a manhole. construction work can be carried out. Since the buried pipe used for earth and sand excavation is used as it is as the receiving part of the underground propulsion pipe and the concrete outer frame of the rising part of the manhole, work efficiency is greatly improved.

The area around the shaft is not backfilled, so there is no risk of it collapsing, and the area around the steel pipe itself, which forms the base of the manhole, is made of earth and sand without backfilling, and it can be strengthened with chemicals, making it an extremely stable underground propulsion pipe manhole. This has the effect of being able to form a

[Brief explanation of drawings]

Figure 1 is a diagram showing each step of the construction method of the present invention, Figure 2 is a diagram showing a mobile crane and its attached equipment used to carry out the construction method of the present invention, and Figure 3 is a diagram showing the construction method of the present invention. It shows the structure of the buried pipe related to
FIG. 4 shows the structure of the connecting casing, and FIG. 5 shows the structure of the connecting member of the connecting casing. Further, FIGS. 6 and 7 are diagrams showing the conventional construction method. 1... Buried pipe, 2... Installation port, 3... Blind plate, 4
...Drilling member, 5...Blade tip, 6...Mounting base,
7... Connection screw hole, 8... Excavator, 9... Rope, 10, 13... Connection casing, 11... Connection member, 12... Connection member, 14... Chemical solution, 15
... Bottom surface, 16 ... Underground propulsion pipe, 17 ... Manhole rising part, 18 ... Manhole frame, 19 ...
…concrete.

Claims (1)

[Claims] 1. A buried pipe that has an underground propulsion pipe installation port on its side and is closed by removably applying a blind plate to the installation port is press-fitted into the ground while excavating the earth and sand inside the buried pipe, and then the connecting casing is removed. After removably connecting to the buried pipe and press-fitting it while similarly excavating earth and sand to make the buried pipe reach the reaching position of the underground propulsion pipe, fixing the buried pipe at the reaching position of the underground propulsion pipe, The blind plate is removed and the reaching underground propulsion pipe is attached to the underground propulsion pipe installation port of the underground pipe, and then the connecting casing is separated from the underground pipe and the connecting casing is removed while the underground pipe remains underground. A method for forming a reaching shaft, which comprises constructing a manhole frame on the remaining buried pipe while pulling it upward.