JP3131688B2 - Construction method of 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 method for constructing a shaft where a shield excavator or other excavator starts and reaches.

[0002]

2. Description of the Related Art The side wall (retaining wall) of a shaft where an excavator starts and reaches is formed by excavating the ground in a groove-like shape, suspending a steel cage made of a steel bar or a steel frame inside the ground, and then concrete. It is cast and built. Therefore, when the excavator starts or reaches through the side wall of the shaft, it performs soil improvement outside the shaft to stabilize the ground, and reinforces the steel bars and steel frames placed on the side wall of the shaft. It employs a method of manually removing the excavator and starting or reaching the excavator from the side wall of the shaft.

[0003]

[Problems of the prior art] However, in such a conventional method, the ground is improved outside the shaft to stabilize the ground,
Not only does it require a great deal of labor, such as the need to manually remove the reinforcing bars and steel structures placed on the side walls of the shaft, but also involves dangerous work, etc., and has problems in economy and safety.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and a shaft is constructed by using a simple underground continuous wall, so that the excavator can easily start. It is an object of the present invention to provide a method of constructing a shaft, which can be reached.

[0005]

SUMMARY OF THE INVENTION The present invention, which solves the above-mentioned problems, is directed to the construction of a shaft which allows a machine to start or reach, in which a trench is excavated in the ground, and a reinforcing bar and a steel frame are provided in the trench. Hang the reinforced basket, and then on top of this reinforced basket,
A fiber cage composed of reinforcing fibers is connected and suspended, and furthermore, a reinforcing bar or a steel cage composed of steel frames is connected and suspended above the fiber cage, and then concrete is poured into the excavation trench. This is a vertical shaft construction method characterized by a vertical shaft construction method to be constructed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

<A> Overall Structure The reinforcing material for the wall surface of the shaft of the present invention is constructed by joining a reinforcing rod cage 2 made of a reinforcing bar or a steel frame and a fiber basket 3 or 4 made of a reinforcing fiber belt.

<B> Reinforcing Bar Basket The reinforcing bar basket 2 is a basket body composed of only the reinforcing bars 22 or a conventionally known cage body formed by welding the reinforcing bars 22 around a frame 21 made of steel. Reinforcement basket 2 reinforces concrete to construct a wall surface having a predetermined strength.

<C> Resin frame fiber basket The fiber basket 3 is composed of a resin frame fiber basket 3 in which a reinforcing fiber belt 5 is attached around a resin frame 31, or a frameless fiber basket 4 that does not use the resin frame 31. The resin frame fiber basket 3 constitutes a resin frame 31 by assembling rods such as plastics, carbon fibers, glass fibers, and PVC pipes according to the shape of the retaining wall. The resin frame 31 is made of a material that is easily cut, such as a plastic material or a PVC pipe. Then, a number of belts 5 of reinforcing fibers exhibiting a belt shape in the vertical direction are attached to the resin frame 31, and a tape 6 of reinforcing fibers is wound around the belt 5 to obtain the resin frame fiber basket 3. In addition, resin frame fiber basket 3
May be omitted from the reinforcing fiber tape 6 in some cases.

<D> Frameless fiber basket. Although the above example is a configuration in which the resin frame 31 is assembled and the reinforcing fiber belt 5 is attached to the inside or outside thereof, the frameless fiber basket 4 that does not use the frame 31 may be configured. In this case, the reinforcing band 41 is formed by impregnating a resin into a band-like reinforcing fiber reinforced with continuous fibers, and the reinforcing band 41 is formed into a closed loop. Or,
The reinforcing band 41 is formed in a spiral shape. This reinforcing band 41
It can be formed arbitrarily according to the shape of the retaining wall, and rigidity can be ensured to some extent by the amount of resin to be impregnated. The reinforcing fiber belt 5 is attached to the inside or the outside of the reinforcing band 41 manufactured in this manner while using the assembling stand, and the frameless fiber basket 4 is obtained.

<E> Reinforcing fiber belt (main material) The reinforcing fiber belt 5 disposed in the fiber baskets 3 and 4 is formed by impregnating a continuous fiber reinforcing material such as carbon fiber with a resin to a predetermined thickness. It is a belt body that is drawn out and molded.
When a granular material such as silica sand is adhered to the surface of the reinforcing fiber belt 5 with an adhesive such as an epoxy resin, it is possible to ensure that the adhesive force with the poured concrete is equal to or higher than that of a reinforcing bar or the like.

<F> Reinforcement Tape In the resin frame fiber basket 3, if the reinforcement tape 6 is wound around the outer periphery of the vertically arranged reinforcing fiber belt 5 in the direction crossing the belt 5, the resin frame 31 and the belt 5
Can be integrated with the resin frame fiber basket 3
It is possible to improve the overall strength and obtain a predetermined strength as a concrete member. The reinforcing tape 6 is a long belt-shaped body made of continuous fibers, and is formed by loop-shaped winding in which the fiber belt 5 is wound around the outer periphery of the fiber belt 5 and then adhered and closed with a resin, or continuous spiral-shaped winding. I do. Protrusions such as silica sand can also be provided on the surface of the reinforcing tape 6 using a resin or the like.

[0013]

[Construction method] Next, a construction method based on the construction method of the shaft is described. <A> Excavation of ditch. Of the four walls of the shaft, three will be constructed as normal reinforced concrete walls. In particular, the construction of the wall on the surface where the excavator c starts or reaches will be described. First, the trench 7 is excavated while filling the position with a bentonite liquid or the like.

<B> Hanging a reinforced cage. The lower reinforcing bar basket 2 made of a reinforcing bar and a steel frame is suspended in the groove 7 by a crane. The height of the lower reinforcing cage 2 is equal to the dimension from the bottom of the groove 7 to the position of the lowermost bottom of the shield excavator c.

<C> Hanging the fiber basket. When the upper end of the lower reinforcing cage 2 is suspended near the ground surface, it is temporarily held, and the reinforcing fiber belt 5
Connect the resin frame fiber basket 3 or the frameless fiber basket 4 surrounded by. Then, the suspension is started again. The reinforcing cage 2 is connected to the fiber cages 3 and 4 by reinforcing the reinforcing fiber belt 5 protruding from the end of the fiber cage 3 or 4.
What is necessary is just to sandwich and connect to the steel frame 21 of an end part using an adhesive agent, a steel plate, a bolt, etc. This fiber basket 3, 4
The height in the vertical direction is slightly longer than the height of the shield excavator.

<D> Hanging the reinforced cage. Further, an upper rebar basket 2 made of a reinforcing bar or a steel frame is connected to the upper portion of the fiber basket 3 or 4, and is suspended. The height of the upper reinforcing cage 2 is such that the upper end thereof reaches near the ground surface when the suspension in the groove 7 is completed.

<E> Casting concrete. After the lower reinforcing cage 2, the intermediate fiber cages 3 and 4, and the upper reinforcing cage 2 on the lower reinforcing cage 2 are sequentially connected and suspended, concrete is poured into the excavation groove 7. Casting is performed by replacing the filling liquid with concrete using a tremy tube as in the conventional method.

<F> Starting the excavator. When the excavator c starts moving, a reaction force is applied to the reaction wall in the shaft and the excavator c is advanced toward the concrete wall on which the fiber basket 3 or 4 is installed. The cutter of the excavator c is the fiber basket 3 or 4.
Dig while cutting the part. The resin frame fiber basket 3
Since it is made of a reinforcing material that is easy to cut together with the resin frame 31, it can be easily cut by a cutter of an excavator, and the excavator c can easily penetrate a concrete wall. In the case of the frameless fiber basket 4, since the frame 31 does not exist, cutting of the wall surface is easier. Therefore, it is not necessary to stabilize the ground by cutting the reinforced concrete on the through wall and improving the surrounding ground for that purpose, which has been performed conventionally.

[0019]

Since the present invention has been described above,
The following effects can be obtained. <B> The reinforcing material of the penetration wall is made of reinforced fibers. Therefore, the cutter bit of the excavator can reliably cut and discharge, and can easily penetrate the side wall of the shaft. As a result, it is not necessary to improve the ground outside the shaft, or the cutting operation can be saved, and workability, economy and safety are improved. <B> The shaft is constructed by connecting the lowermost steel cage, the intermediate fiber cage, and the steel cage on the lower shaft in order, and then pouring concrete into the excavation trench. Therefore, a wall surface that can be easily cut can be installed at an accurate position by a simple operation. <C> Since no ground improvement work is required, it is possible to prevent groundwater contamination and adverse effects on the surrounding ground. <D> Since the construction of the shaft is the same as the conventional method, new equipment and machinery are not required. <E> By adhering particles such as silica sand to the surface of the reinforcing fiber belt, adhesion to concrete can be reliably obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a construction method according to the present invention.

FIG. 2 is an explanatory view of a resin frame fiber basket.

FIG. 3 is an explanatory view of a frameless fiber basket.

FIG. 4 is an explanatory diagram showing a state in which an excavator starts from a shaft.

Continued on the front page (72) Inventor Masao Arai 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Kimitaka Uji 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Masahiko Uemura 1-1-39 Hiroo, Shibuya-ku, Tokyo Tonen Corporation (72) Inventor Hiroyuki Yoshizawa 1-1-39 Hiroo, Shibuya-ku, Tokyo Tonen Corporation (56 References JP-A-11-200761 (JP, A) JP-A-5-302490 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 301 E02D 5/20 102

Claims (5)

(57) [Claims] Claims: 1. Construction of a shaft where an excavator starts or reaches, excavates a groove in the ground, suspends a reinforcing rod basket composed of a reinforcing bar and a steel frame in the groove, and then places the reinforcing rod basket on top of the reinforcing rod basket. , A fiber basket composed of reinforcing fibers is connected and hung down.
Rebars or steel cages connected with steel frames are connected and suspended, and then concrete is poured into the excavation trench to construct.
How to build a shaft. 2. A belt-like body composed of continuous fibers as reinforcing fibers, the surface of which is constructed using a fiber basket composed of reinforcing fibers to which particles such as silica sand are adhered. How to build a shaft. 3. The shaft construction according to claim 1, wherein the fiber cage made of the reinforcing fibers is formed of a frame made of a material that is easily cut, and a belt of the reinforcing fibers is attached to the outer periphery of the frame. Method. 4. A fiber basket made of reinforcing fibers, wherein a frame is made of a material that is easy to cut, a belt of reinforcing fibers is attached to the outer periphery of the frame, and a reinforcing tape is wound around the belt. 2. The method for constructing a shaft according to 1. 5. A fiber cage made of reinforcing fibers, wherein a reinforcing band obtained by impregnating a resin into a reinforcing fiber band is formed into a loop shape.
2. The method according to claim 1, wherein the shaft is formed in a spiral shape, and a reinforcing fiber belt is attached to the reinforcing band. 3.