JPS5858399A - Prevention of freezing of tunnel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a tunnel freezing +h construction method.

Tunnels are required to have thermal insulation and waterproof properties in winter, especially in cold regions. This is because water from the soil seeps into the concrete inner wall of the tunnel, hangs down as icicles, and freezes, causing the tunnel to become distorted.
1.111 will lead to damage to the tunnel, so this must be prevented.

Therefore, attempts have been made to make them cold resistant using heaters, etc., but the costs are high and sufficient results cannot be obtained.

Recently, a construction method has been developed in which a waterproof board is installed on the concrete inner wall If, and a synthetic rubber or synthetic resin foam is sprayed on top of this to form a heat insulating layer, and then an inner wall is formed. A method of creating a rough gap has been proposed in Japanese Patent Publication No. 50-1310, Japanese Patent Publication No. 52-291, etc.

However, this method uses a combination of an organic layer and an inorganic layer to create a rectangular layer, so if a fire breaks out in a tunnel, there will be some problems because the organic layer is combustible, and it is difficult to apply a fireproof layer. Even if this were the case, it would be necessary to spend a number of steps to form three layers: a fireproof layer, a heat insulating layer, and a fireproof layer.

The present invention has a structure in which a closed foam made of inorganic yarn is attached to the concrete inner wall of a tunnel with a gap between the concrete inner wall and the closed foam of Jut, and the closed foam is used to waterproof and insulate the tunnel. It also serves as a fireproof layer and solves the above drawbacks.

Next, embodiments of the present invention will be described based on 14 pages.

FIG. 1 is a sectional view of the tunnel, and FIG. 2 is a developed view thereof. In Figure + mf, 1 is a tunnel made of a concrete layer, 2 is an asbestos calcium carbonate foam plate as an inorganic closed foam, and the inner wall of the inorganic closed foam 2-layer tunnel L is shown in Figures 3 to 5. As shown in the enlarged cross-sectional view of the tunnel 1, the inorganic closed foam 2 is processed into a plurality of plates of appropriate thickness, and is placed along the inner wall of the tunnel 1. The anchor bolt 4 is held in such a way that there is a space 1Ift3 between the tunnel 1 and the inner wall of the tunnel 1. In the connecting part AM of the inorganic closed foam 2 processed into multiple plates, the cutout parts 5 are overlapped and the presser plate 6 is applied to the outer surface so that the entire wall surface of the inorganic closed foam 2 can be accessed. The voltage is set to 4 V& by using the bolt 4.

In this embodiment, the asbestos-charcoalized calcium foam board was used as the inorganic closed foam material because it has recently been attempted to be used as a -f heating element in houses, etc., and is easily man-made.

Since the present invention has the above configuration, it has the following advantages.

In other words, the inorganic closed foam used in the present invention is nonflammable because it contains inorganic C, and because it is a closed foam, it does not allow water to pass through, so it can act as a fireproof layer as well as a waterproof and heat insulating layer. It has the characteristic of Moreover, since it is only necessary to use IH for one layer, it is natural to use bolts to investigate.
Since there is no need to use an organic adhesive, the fire prevention effect can be improved. Even if an adhesive is used, since there is a gap between the inner wall of the tunnel 1 and the inorganic closed foam 2, it will be limited to only a few places 6 such as the plate connection parts, so it will not affect the nonflammability much.

Therefore, according to the invention, what conventionally required three steps for waterproofing, heat insulation, and fire protection by combining an inorganic layer and an organic layer 1i to 1, can be reduced to just one step by one step M. The minor key of the prefecture will become iT ti, and a significant reduction in construction costs can be expected. At the same time, in conventional construction methods, waterproof layer phase, insulation layer phase,
Previously, the cost of three types of materials for the fireproof layer phase was required, but with the present invention, only one rule is required, and the material is made of inorganic yarn (3).Since it is a commercial foam, the price is low, and it is also advantageous in terms of material cost. Significant savings in construction costs can be expected.

Furthermore, in terms of workability, when repairing existing tunnels, conventional methods often have attachments such as cables, power lines, lighting lights, etc. However, the inorganic closed foam used in the present invention can be cut with a knife or the like on site, and can be adhered with an adhesive, so it is fully possible to construct it on site, and there is no need to scale it to the original size in advance. can be expected.

With conventional technology (for example, Japanese Patent Publication No. 52-291), it was necessary to perform secondary processing such as protrusions or (. If it is necessary, the inorganic closed foam can be used as forest material, so it can be processed freely and the thickness can be adjusted at will.

Furthermore, since the material of the present invention is a closed foam of inorganic yarn, it is very light and heavy. In addition, it is easy to work with, requires fewer bolts, etc., and can be reduced to 14 iA. Furthermore, if necessary, it is possible to increase durability as well as waterproofing and insulation by not covering the material with inorganic fiber (4).

[Brief explanation of the drawing]

Cross section of No. 11XJ61 tunnel 1z1 Figure 2 is expanded 1f
fl. 3 to 5 are partially enlarged sectional views. In the drawing, 1 is a tunnel concrete layer, 2 is an asbestos calcium carbonate foam board as an inorganic closed foam, and 3 voids. Patent applicant Shobond Construction Co., Ltd. Patent attorney
Written amendment by Harumi Ujo (spontaneous) February 3, 1980'1 2, Title of invention: Tunnel freezing prevention method 3, Relationship with person making the amendment 1 Address of patent applicant: Ichigaya, Shinjuku-ku, Tokyo Honmuracho 34 name
Representative of Shobond Construction Co., Ltd. 1) 1932, Agent address: 7-10-19 Nishi-Shinjuku, Shinjuku-ku, Tokyo, Specification 6, Amendment details listed on page 1, line 12, 1 fireproof layer insulation. Correct the number of layers: one waterproof layer, one insulation layer, and one fireproof layer.

Claims (1)

[Claims] An inorganic closed foam is attached to the concrete inner wall of a tunnel with a gap between the concrete inner wall and the inorganic closed foam, thereby forming a waterproof, heat insulating and fireproof layer. A method for preventing tunnel freezing.