JPH09209687A - Arrival shaft and construction thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce construction precesses of a shaft by eliminating supporting works or the like and reduce the construction period and cost and obtain a reliable strength. SOLUTION: A circular shaft is formed by steel pipes 9 erected at the arrival side, in an arrival shaft in a small diameter shielding or a propulsive work thereof. Steel pipes 9 are erected while adding them, by the whole rotary type power easing jacks in the whole peripheral rotating all easing cast-in-place concrete pile work and the soil inside the steel pipes 9 is excavated and discharged by a hammer grab and after the slime-treatment in the tunnel, a bottom bed concrete is placed to construct the shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple reach shaft in a small-diameter shield or the same propulsion method.

[0002]

2. Description of the Related Art When laying a gas pipe, for example, a small-diameter shield or the same propulsion method may be adopted. This is to bury a gas pipe as a burial pipe by a burial pipe propulsion device, etc. The burial of such a burial pipe is performed by previously excavating a starting shaft 1 and a reaching shaft 2 according to a construction plan as shown in FIG. A reaction force body (wall) 3 is installed on the first side, and a propulsion device 6 is provided which is provided on a gantry so that a drive mechanism, a speed reducer, and other excavation mechanism 4 can be moved back and forth by a propulsion jack 5.

An auger head 7a is provided at the tip, and a front conductor 7 having a screw shaft penetrated therein is propelled by a propulsion device 6, and then a buried pipe 8 having a casing and a screw shaft set on the ground is sequentially connected to the front conductor 7. While rotating the auger head 7a via the screw shaft by the excavation mechanism 4,
The excavated soil is conveyed to the propulsion device 6 side by the screw shaft and discharged, and at the same time, the whole of the propulsion jack 5 is pushed out and propelled.

If the leading conductor 7 reaches the reaching shaft 2,
As shown in FIG. 10, the front conductor 7 and the auger head 7a are recovered from the reaching shaft 2, and the propulsion device 6, the screw, the casing, the hydraulic hose and the like are recovered from the starting shaft 1.

When burying a buried pipe such as a gas pipe with a buried pipe propulsion device as described above, a simple reaching vertical shaft 2 is required, but the conventional reaching vertical shaft 2 is, for example, a parent pile / lateral sheet pile method, a sheet. It was built by the pile method, underground continuous wall method, liner plate method, etc.

In the main pile / lateral sheet pile construction method, H-section steel or the like is used as a main pile, and wood sheet pile or the like is passed between the main piles to form a retaining wall. In the sheet pile method, sheet piles are continuously driven into The underground continuous wall construction method is to construct a reinforced concrete wall, a concrete wall containing a core material (H-shaped steel, etc.), or a mortar (or soil mortar) wall in succession to make a retaining wall. In addition, the liner plate construction method is one in which the liner plate is assembled by the reverse winding construction method to form a retaining wall, and the sheet pile construction method and the underground continuous wall construction method are waterproof still retaining walls, but the main pile and side sheet pile construction method is The liner plate method is an open soil retaining wall.

[0007]

[Problems to be Solved by the Invention] Among the above-mentioned construction methods, the flow of the whole construction process of burying a buried pipe by the main pile / lateral sheet pile construction method, sheet pile construction method, underground wall construction method is・ Construction of earth retaining bars, construction of the structure, backfilling / removal of retaining earth retaining works, and then generally removing earth retaining walls except for underground continuous wall construction method. There are many, and it takes a lot of construction days, and there are things that are difficult to deal with at sites where the construction period is severe.

Further, in the liner plate construction method, in the case of a small diameter, manual work is mainly performed, so that it takes a considerable number of days to construct a vertical shaft. In addition, in places with a lot of spring water, auxiliary construction methods (chemical injection, deep well, etc.) are required, which increases the construction cost.

Further, except for the case where a work such as a piping facility is built inside the reaching shaft, the work contents are often excessive except for special cases, which is a waste of construction cost. .

The object of the present invention is to eliminate the inconveniences of the above-mentioned conventional examples, to reduce the type of construction work for vertical shafts by eliminating the need for supporting work, to shorten the construction period and the construction cost, and to be reliable in terms of strength. To provide a reaching shaft and its construction method.

[0011]

In order to achieve the above-mentioned object, the present invention has as a structure a reaching vertical shaft in a small-diameter shield or the same propulsion work, which is formed into a circular vertical shaft with built-in steel pipe, and As a construction method, a full-rotation power casing jack is used to build up all-rotational all-casing cast-in-place piles while adding steel pipes. The main idea is to construct a vertical shaft by casting.

According to the present invention as set forth in claim 1, since the vertical shaft is constructed from the built-in steel pipe, it can be easily constructed and becomes a circular vertical shaft, so that it has a strength against external earth pressure and water pressure without supporting work. can get.

According to the second aspect of the present invention, the steel pipe is built by the full-rotation type power casing jack, and the earth and sand in the steel pipe is excavated and discharged by a hammer grab, and the support is not required. And excavation and soil removal will be speeded up and the construction period will be shortened.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a vertical sectional front view showing a main part of an embodiment of a reaching shaft of the present invention, and FIG. 2 is a plan view of the same.
For example, a steel pipe 9 of φ2000 mm is built on the arrival side of the buried pipe, and a circular reaching shaft 2 is constructed by the steel pipe 9.

The reaching shaft 2 formed in this way is a simple reaching shaft when the gas pipe 10 is buried by the above-mentioned buried pipe propulsion device, etc., and is cut out at a necessary portion by mirror cutting to guide the leading conduit here. To do.

Further, the reaching shaft 2 is installed in the gas pipe.
10 is started up, and this extends horizontally to the other, but at the upper part where the gas pipe 10 is piped in this way, the wall of the steel pipe 9 is appropriately cut and the upper part of the reaching pit is widened and used. In the figure, 11 is a lightweight steel sheet pile built in the cut portion of the steel pipe 9, 12 is a handrail around a vertical shaft, and 13 is a lifting ladder.

Next, a method of constructing the reaching shaft 2 by incorporating the steel pipe 9 will be described with reference to FIGS. As shown in Fig. 3, the excavator including the generator 14, hydraulic unit 15, excavator body 16, counterweight 17, etc. is brought into the construction site where the vertical shaft is to be built, and the generator 14 and hydraulic unit 15 are electrically wired. Connection with the hydraulic unit 15 and the excavator body 16
And connect with hydraulic piping to assemble.

The excavator main body 16 uses an elevating jack that also serves as an outrigger and a full-rotation type power casing jack equipped with a chuck holding mechanism for the outer circumference of the steel pipe 9. The counterweight 17 uses, for example, an iron plate mat.

As shown in FIG. 4, a shining point 19 having a pile diameter is placed around the pile core at the excavation position of the reaching shaft 2, and a counterweight 17 made of an iron plate mat is laid around the pile for reinforcing the ground. The main body 16 of the excavator is lifted up by the crane 18, the steel pipe 9 is held, and the pile core lighting point 19 and the outer diameter of the steel pipe 9 are aligned with each other. An excavating blade is formed at the tip of the steel pipe 9.

Next, by the all-circle rotary all-casing cast-in-place pile construction method, as shown in FIG. 5, the excavator body 16 holding the steel pipe 9 is held.
The steel pipe 9 is pushed in while continuously rotating in a clockwise direction, and the earth and sand in the steel pipe 9 is excavated and discharged by the hammer grab 20 hung by the crane 18.

When pushing the steel pipe 9, the vertical direction is obtained by observing the pushing direction from two directions at right angles by a transit or a plumb bob. When the lower steel pipe 9 has finished lowering, the upper steel pipe 9 is suspended, welding is performed, and then excavation is started again.

If the steel pipe 9 is built up to a predetermined depth,
After confirming the depth with Eslon tape, etc., slime treatment is performed inside the mine (see Fig. 6). Slime has substances floating in the mine water and uncut residue remaining at the bottom of the hole. To remove these, a slime bucket 21 with a valve-shaped inner lid 21a at the bottom is placed in the mine water. Suspend and vigorously move the slime up and down 3 to 4 times at the bottom of the excavation to stir the slime.
Stand still for 20 minutes, wait for precipitation, then gently pull up the slime bucket 21.

Next, as shown in FIG. 7, the tremie pipe 22 is installed inside the mine. A ø250 mm flange bolt joint type is used for the tremie pipe 22, 1,2,3,4,6 m are combined as required, and rubber joints are applied to the joint portion to ensure watertightness. The tremie pipe 22 is built vertically down to the center of the mine, a plunger 23 is inserted to prevent mixing of the mine water with concrete to be poured, and a hopper 24 for receiving a concrete is attached to the upper part.

The steel pipe 9 is used for excavating machines and cranes.
8, move the agitator wheel 25 to near the steel pipe 9 as shown in FIG. 8, pour the chute 26 of the agitator wheel 25 on the hopper 24 of the tremie tube 22 and pour concrete into the tremie tube 22. The bottom concrete 28 is placed on the bottom of the steel pipe 9.

Eslon tape 27 with weight 29 attached to steel pipe 9
It is hung inside and the top end of the bottom concrete 28 is measured, and when it reaches a predetermined height, it is stopped.

[0026]

As described above, according to the ultimate shaft and its construction method of the present invention, since the vertical shaft is constructed by the built-in steel pipe, it can be easily constructed, and it becomes a circular vertical shaft. Strength can be obtained without supporting work.

In addition, a steel pipe is built with a full-rotation type power casing jack, and the earth and sand in the steel pipe are excavated and discharged by a hammer grab to speed up the construction, excavation and earth removal, and shorten the construction period. Is.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of a reaching shaft of the present invention.

FIG. 2 is a plan view showing an embodiment of a reaching shaft of the present invention.

FIG. 3 is a front view of a first step showing a method of constructing a reaching shaft of the present invention.

FIG. 4 is a front view of a second step showing the method of constructing the reaching shaft of the present invention.

FIG. 5 is a front view of a third step showing the method of constructing the reaching shaft of the present invention.

FIG. 6 is a front view of a fourth step showing the method of constructing the reaching shaft of the present invention.

FIG. 7 is a front view of a fifth step showing the method of constructing the reaching shaft of the present invention.

FIG. 8 is a front view of a sixth step showing the method of constructing the reaching shaft of the present invention.

FIG. 9 is a vertical cross-sectional front view of essential parts showing a usage state of the reaching shaft of the present invention.

FIG. 10 is a plan view of an essential part showing a usage state of the reaching shaft of the present invention.

[Explanation of symbols]

1 ... Starting shaft 2 ... Reaching shaft 3 ... Reaction force body 4 ... Propulsion mechanism 5 ... Propulsion jack 6 ... Propulsion device 7 ... Leading conduit 7a ... Auger head 8 ... Buried pipe 9 ... Steel pipe 10 ... Gas pipe 11 ... Steel sheet pile 12 ... Handrail 13… Lifting ladder 14… Generator 15… Hydraulic unit 16… Excavator body 17… Counterweight 18… Crane 19… Pile core light point 20… Hammer grab 21… Slime bucket 21a… Inner lid 22… Tremy tube 23… Plan Jar 24… Hopper 25… Agitator car 26… Shoot 27… Eslon tape 28… Bottom concrete 29… Weight

Claims (2)

[Claims] 1. A reaching vertical shaft for a small-diameter shield or the same propulsion work, which is formed as a circular vertical shaft by a steel pipe built on the reaching side. 2. A full-rotation power casing jack is used to build up a steel pipe by the all-rotation all-casing cast-in-place pile construction method. A method for constructing a reaching shaft, which is characterized by pouring concrete to construct a shaft.