JP2828786B2 - Casing shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing shaft used for a method of propelling a sewer pipe or the like.

[0002]

2. Description of the Related Art The applicant of the present application has disclosed a circular casing shaft in which a steel casing having a circular cross section is buried in the ground as a casing shaft used for a method of propulsion of sewer pipes and the like. No. 61-75198). This circular casing shaft is a steel casing with a circular cross section, which is buried inside while alternately press-fitting and excavating, and is significantly different from the conventional method of driving steel sheet pile or using a liner plate. The construction period can be shortened, and the safety of construction is excellent.

[0003]

However, it is difficult to form the circular casing shaft into a circular casing having a large cross section, and it is necessary to secure a work space using a general-sized propulsion device and a propulsion pipe. Can not. Therefore, in the propulsion method using the circular casing shaft, a special propulsion pipe and a propulsion device for the circular casing are used.

When this circular casing shaft is used as a reaction wall of a propulsion device, there is also a problem that it is difficult to take a horizontal reaction force on soft ground having a weak lateral supporting force. Therefore, an object of the present invention is to solve the problems in the conventional circular casing shaft, to have a working space in which a general propulsion device can be used, and to obtain a sufficient horizontal reaction force even on soft ground. It is to provide a casing shaft.

[0005]

In order to achieve the above object, a casing shaft according to the present invention communicates with a plurality of steel circular casings buried underground by a horizontal shaft, and further connects the steel circular casing to the inside of the horizontal shaft. Characterized in that they are connected by a connecting member provided in (1).

[0006]

A plurality of circular casings communicate with each other through a horizontal shaft, thereby securing a wide working space in which a general propulsion device can be used. Also,
Since the plurality of steel circular casings are integrated by being connected, the horizontal supporting force is increased.

[0007]

FIG. 1 is a plan view showing an embodiment of a casing shaft according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG.
FIG. 3 is a sectional view taken along line BB of FIG. 2.

Referring to FIG. 1, reference numerals 1 and 1 denote circular casings made of steel, which are embedded at predetermined intervals in a propulsion direction in consideration of a required space of a propulsion machine to be used. As this interval, for example, in a casing having a diameter of 2400 mm,
TH80 type propulsion machine (L = 4470mm, W = 1400m
m, H = 1400 mm), about 200 mm is required.

Reference numeral 2 denotes a horizontal shaft which communicates between the circular casings 1 and 1, which is formed by cutting the casing wall above the foundation concrete 3 with a fuser to provide an opening and excavating between the casings 1 and 1. . The opening can be appropriately determined according to the working space of the propulsion device to be used and the carrying space of the device. For example, when the TH80 type propulsion device is used, a width of about 2000 mm and a height of about 2000 mm are required. If the opening is made too wide, the strength of the casing itself is affected, so that it is preferably as small as possible.

Reference numerals 4a, 4b, 4c, and 4d denote connecting members provided in the horizontal shaft 2 for connecting the steel casings 1, 1. In the present embodiment, a steel plate connecting member is also used for lining of the shaft 2 and the upper and lower surfaces and side surfaces 4a, 4b,
The structure is divided into 4c and 4d. The joining surfaces of the connecting members 4a, 4b, 4c and 4d are joined by welding, and both ends in contact with the circular casings 1 and 1 are also joined by welding, so that the two casings 1 and 1 are integrated. I have. In addition, it is also possible to connect the casings 1 and 1 with a connecting member such as an H-shaped steel instead of a steel plate.

A hatched area 5 shown in FIGS. 1 and 2 is a ground improvement area by injecting a chemical solution, which is performed according to the state of the ground for safety when excavating the horizontal shaft 2. As this liquid injection,
It is necessary to make the ground self-supporting, and for example, a jet grout method using a cement system is preferable.

FIG. 4 is a sectional view taken along line CC of FIG. 2 showing a state in which the propulsion unit 6 is set in the steel casing vertical shaft. In the figure, 6 indicates a propulsion device, and 7 indicates a bearing wall. As shown in the figure, a general propulsion device 6 that cannot be installed with a single casing shaft can be set from one casing shaft 1 to the horizontal shaft 2 and further to the other casing shaft 1.

Next, referring to FIGS. 5 (a) to 5 (d),
The construction process of the casing shaft will be described. .

First, the applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 61-8371.
The circular casing is buried using the pit excavator disclosed in No. 9. Referring to FIG. 5A, reference numeral 30 denotes a shaft excavator, which is provided below a power shovel 31 with a tubing machine 34 having a cylinder for press-fitting, pulling and swinging a casing 1, and a wire rope provided at a tip of a boom 33. A digging tool 38 is connected to the lower end of 37.

Using this apparatus 30, the casing 1 is held in the tubing machine 34, and the press-in / pull-out hydraulic cylinder 36 and the swing hydraulic cylinder 40 are operated to press-fit the casing 1 into the ground. Then, the winch 39 is operated to insert the digging tool 38 into the casing, and the digging tool 38 is operated to excavate and discharge the inside of the casing. This is repeated to bury the casing 1 at a predetermined position. Thereafter, the next circular casing 1 is buried at a predetermined interval.

Next, as shown in FIG. 5 (b), a treble tube 41 is arranged and ready-mixed concrete is cast to form a bottom concrete 3.

Further, as shown in FIG. 5 (c), the ground is improved by the jet grouting method so that the ground becomes self-supporting around the formation of the horizontal shaft. In the figure, reference numeral 50 denotes a chemical grouting machine for jet grout.

After the ground improvement, as shown in FIG. 5 (d), the side of the casing 1 is gas-cut to provide an opening for the cross shaft, and the space between the casings 1 and 1 (shaded area in the figure) is excavated to The pit 2 is formed. And finally, the connecting member 4 in the shaft 2
a, 4b, 4c and 4d are arranged, connected by welding and integrated to complete a casing shaft.

In this embodiment, two casing shafts are used.
Although the arrangement in the rows has been described, it is needless to say that the arrangement is not limited to this.

In this embodiment, the shaft for the propulsion method has been described. However, the shaft can be used as a shaft in a curved portion in the underground work of electric wires.

[0021]

According to the present invention, the following effects can be obtained.

Since a long space can be secured in the propulsion direction, a general propulsion device (propulsion pipe, propulsion device) can be adopted even in a small-diameter circular casing shaft.

Since a plurality of casing shafts work together, a sufficient horizontal reaction force can be obtained even in soft ground where lateral supporting force is insufficient.

When used in the reaching shaft of the small-diameter propulsion method, it is possible to recover the small-diameter propulsion machine as long without dividing the leading pipe or the temporary pipe.

It is possible to construct a shaft in the minimum range required for the propulsion work, and the amount of generated soil and backfill soil is small and economical. Also, the construction period can be shortened.

The area of the ground surface opening is small, and it can be built in a place where underground buried objects are congested, while avoiding buried objects, and road traffic obstruction is minimized.

Since the ground improvement work is limited to the horizontal shaft construction part, a large-scale construction such as another construction method is not required.

[Brief description of the drawings]

FIG. 1 is a plan view of a casing shaft.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a cross-sectional view taken along line CC of FIG. 2 showing a state in which a propulsion device is set.

FIG. 5 is a diagram illustrating a construction process of a casing shaft.

[Explanation of symbols]

 Reference Signs List 1 casing 2 horizontal shaft 4a connecting member 4b connecting member 4c connecting member 4d connecting member

Claims (1)

(57) [Claims] 1. A casing, wherein a plurality of steel circular casings buried in the ground are communicated by a horizontal shaft, and the plurality of steel circular casings are connected by a connecting member provided in the horizontal shaft. Shaft.