JPH08108413A - Manufacture of hybrid segment - Google Patents

Abstract

PURPOSE: To manufacture hybrid segments with high dimensional accuracy by enabling the deformation of an outer case to be precluded, and also enabling the wall thickness of linings to be thinned. CONSTITUTION: Six pieces of linings are fabricated by allowing for setting of a lining reinforcing member, and the joint portions are welded so as to form an outer case 1c in such a manner of satisfying the required dimensional accuracy. An outer frame 2d is set outside of the outer case 1c, and foaming stylene 7b in a liquid state as an example of material having fluidity and a curing property is poured in the space defined by the outer frame and outer case at a quantity capable of withstanding swell of the linings due to concrete placement. After the foamed polystyrene is hardened sufficiently, concrete 2c is poured into the hollow portion of the outer case.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method of reinforcing a lining in the manufacture of hybrid segments.

[0002]

2. Description of the Related Art In order to manufacture a hybrid segment of steel and concrete, generally, a lining of steel plates is assembled into a hollow box type and welded to form an outer box, and then the hollow portion of the outer box is filled with concrete. The method is taken. Reference numeral 1 in FIG. 2A shows a shield tunnel manufactured by using the hybrid segment 2. FIG. 2B is a perspective view of each segment, and FIG. 2C is a cross-sectional view showing a joining method of each segment. In the figure, 1c is 1b, 2b, 3
b, 4b, 5b and 6b, an outer box consisting of 6 linings, 2c is concrete filled in the hollow part, 3
c is a square hole used when joining each segment, 4c
Is a dowel for strengthening the connection between the outer case and the concrete, and 5c is a bolt for joining the segments. The shield tunnel 1 is configured by joining the hybrid segments 2 with bolts 5c in the circumferential direction and the longitudinal direction.

In view of the purpose of use of the shield tunnel, when joining the constituent segments, a structure is required in which the joints are in close contact with each other to prevent water from entering from the outside, so each segment is expensive. Dimensional accuracy is required.

Next, in the method of manufacturing a hybrid segment disclosed in Japanese Patent Laid-Open No. 61-286104, a method of manufacturing a hybrid segment for manufacturing a shield tunnel is described.

FIG. 3A is a sectional view showing a method of manufacturing the hybrid segment. 1d is a bolt for joining the outer box 1c and the outer frame 2d, and 2d is an outer frame.

According to the manufacturing method of the present invention, the outer frame 2d is manufactured from a steel plate or the like so that the inner surface dimensions thereof are accurately matched to the dimensions of the hybrid segment, and the inner surface of the outer frame 2d is lined with the linings 1b, 1b.
2b, 3b, 4b, 5b and 6b are fixed with the bolt 1d using the square hole 3c. It should be noted that the gibel 4c and the frame for the square hole 3c are welded to each lining in advance, and the bolt holes are also set therein. Further, as shown in FIG. 3 (c), the groove 1f necessary for welding is processed, and the joint portion of each lining is welded with the ultra-rapid cement 3f through the metal fitting 2f.

After the above work, concrete 2c is poured into the hollow portion of the outer box 1c and solidified. After the concrete is sufficiently solidified, the outer frame 2d is removed, and the joint portion of the outer box 1c is welded along the groove 1f to complete the hybrid segment.

This is a manufacturing method in which the inner surface of the outer frame is manufactured with sufficiently high accuracy, so that the outer box of the segment assembled along with it has a required accuracy.

[0009]

SUMMARY OF THE INVENTION In the above conventional method, a steel plate or the like is used to process the inner surface by matching the outer frame with the dimensional accuracy of the product,
As a result, the accuracy of the inner surface is a method of determining the accuracy of the product, but since the outer frame is made of steel plate or the like, it is heavy and difficult to handle. Further, when the welding time of the joining portion of the lining is carried out after placing and hardening concrete in the hollow portion of the lining, it is possible to imagine deterioration of the concrete due to heat input to the concrete during welding. The water in the concrete evaporates due to the heat of welding, and the steam causes welding to be difficult, and welding defects are likely to occur.

An object of the present invention is to provide a method of manufacturing a hybrid segment which uses a relatively low cost material and satisfies the required dimensional accuracy, unlike the conventional method of manufacturing a hybrid segment. .

[0011]

In the production of a hybrid segment, a thin lining is assembled, a joint is welded, and the outer casing is manufactured with required dimensional accuracy.
A reinforcing material for the lining is obtained by filling a material having fluidity and hardening, or a material having fluidity.

[0012]

In the hybrid segment manufactured by the above means, the lining is reinforced by a material having fluidity and hardening, or a material having fluidity. Therefore, the lining used for placing concrete in the hollow portion of the outer box. The lining can be prevented from bulging, and the lining plate can be thinned by setting the lining reinforcing member. Also,
Since the procedure of assembling the lining and welding is performed before placing the concrete, it is not necessary to consider the adverse effect of welding heat on the concrete and the lining.

[0013]

FIG. 1 shows a method of manufacturing a hybrid segment which is an embodiment of the present invention. In the case of manufacturing the outer box (a), considering the setting of the lining reinforcing member, the six thin linings 1b, 2b, 3b, 4b, 5b, and 6b and the hollow to strengthen the connection between the outer box and the concrete are hollow. The rib 1a installed in the section is assembled, the joint is welded, and the outer box 1c is manufactured so as to satisfy the required dimensional accuracy.

Since the welding between the linings is performed before the concrete is poured into the hollow lining, the present invention considers the adverse effects on the lining and the concrete due to the heat input of the welding heat to the concrete. There is no need to do it. The adverse effect here is considered to be deterioration of the concrete due to heat input to the concrete and a decrease in rigidity of the hybrid segment due to the deterioration. In addition, it may be difficult to carry out the welding work due to the evaporation of water in the concrete due to heat, and the possibility of defective welding may occur.

FIG. 1 (b) shows the setting of the lining reinforcing member. An outer frame 2d is set outside the outer box 1c, and the space enclosed by the outer frame and the outer box has fluidity. As an example of a material that cures and cures, foamed polystyrene 7b in a liquid state
Is poured in an amount that can withstand the bulging of the lining due to concrete pouring.

By hardening the liquid foamed polystyrene, it is possible to prevent the lining from bulging due to the placing of concrete, which is the effect of the present invention, as a reinforcing member for the lining. Here, the foamed styrene to be used needs to have a property such that the temperature at the time of curing does not exert the above-mentioned adverse effects on the concrete.

Even if the outer lining has a complicated shape, liquid styrofoam, which has fluidity, is used. Therefore, the styrofoam spreads to every corner of the lining, and the styrofoam is hardened so that the details of the lining can be improved. Can be reinforced.

After the foam polystyrene is sufficiently hardened, concrete 2c is poured into the hollow portion of the outer box. When the concrete is cast, pressure is applied to the inner surface of the outer box, so that the bulging of the lining is usually generated. However, since the lining is reinforced by the cured foam polystyrene as described above, the deformation of the outer box can be prevented.

In FIG. 1 (c), after the concrete has sufficiently hardened, the hybrid segment is separated from the foamed polystyrene, which is the reinforcing member of the lining, and the outer frame, and the product is completed. As the separation method, as shown in (c), the reinforcement member is appropriately cut to physically remove the segment and the lining reinforcement member, and the solvent is added to the foamed polystyrene, and the foamed polystyrene is melted, and then the segment is melted. A possible method is to remove the from the outer frame. In the latter method using a solvent, it is also possible to take out only the solvent from the dissolved foam polystyrene by some method and reuse the liquid foam polystyrene.

In the second embodiment, sand is used as a lining reinforcing member for the expanded polystyrene of the above-mentioned embodiment. At the same time as concrete is poured in FIG. 1B, sand is poured in the space between the outer box and the outer frame. By placing the concrete and sand at the same pouring level at all times, the lining is reinforced by applying pressure to the outer surface of the lining with sand against the pressure increase on the inner surface of the lining due to concrete placing. Prevent bulging. After the concrete has hardened sufficiently,
The product is completed by removing the sand from the outer frame.

[0021]

INDUSTRIAL APPLICABILITY In the production of hybrid segments, the present invention assembles the lining to the required dimensional accuracy, and it is a material that is hard to be treated and has a fluidity that is easy to handle on the outside of the welded outer box. It is possible to prevent bulging of the lining due to concrete pouring and to thin the lining by filling it with a material that has a lining, and to manufacture a hybrid segment with high dimensional accuracy at low cost. .

[Brief description of drawings]

FIG. 1 is an explanatory view of a method of manufacturing a hybrid segment showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a conventional tunnel shield.

FIG. 3 is a conventional explanatory view of a hybrid segment.

[Explanation of symbols]

1 ... Shield tunnel, 1a ... Rib, 1b, 2b, 3
b, 4b, 5b, 6b ... Lining, 1c ... Outer box, 1
d, 5c ... Bolt, 1f ... Welding groove, 2 ... Hybrid segment, 2c ... Concrete, 2d ... Outer frame, 2f
… Staining metal fittings, 3c… Square holes, 3f… Super fast hardening cement, 4
c ... Gibel, 7b ... Styrofoam.

Claims (2)

[Claims] 1. In the production of a hybrid segment of steel lining and concrete, a thin lining is assembled, an outer box is manufactured so that the joints are adhered and the required accuracy is satisfied, and fluidity is provided outside the outer box. And a hardening material filled with the hardening material, which is hardened, and is used as a lining reinforcing member for preventing the lining from bulging by placing the concrete in an outer box, and a lining plate by setting the lining reinforcing member. A method of manufacturing a hybrid segment, characterized in that the thickness can be reduced. 2. The hybrid segment according to claim 1, wherein a material having fluidity as a lining reinforcing member is poured into the outside of the outer box at the same time as concrete is poured to prevent bulging of the lining due to casting of concrete. Production method.