JPS60141996A - Mortar filling method in shield secondary covering - 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 method for filling mortar in a secondary lining in shield construction.

Conventionally, the method shown in Figure 1 has been used to bury structures such as water pipes underground.

That is, first, while excavating a tunnel, the segments 1, which are the primary lining, are successively connected to form the outside of the tunnel. Next, a steel pipe 2 such as a water pipe is placed and supported by a support means (not shown). ) After being supported at the center of the tunnel, multiple rows of pipes 3 are piled up between the steel pipe 2: and the segment 1 to form a dam. Next, place the mortar injection pipe 4 through the gap between the sandbags 3, inject the mortar 5 into the space partitioned by the sandbag 3, and fill the space between the segment 1 and @pipe 2 with the mortar 5.
The secondary lining is then completely filled. Then, after the secondary lining has been completed over a predetermined length and the mortar has hardened, the sandbags 3 are removed, and the next space is partitioned again with the sandbags 3 to perform the secondary lining.

Therefore, it is necessary to repeatedly stack and remove sandbags 3, which requires a lot of labor and time.
There was a drawback that the cost was %.

The present invention has been made to eliminate the above-mentioned drawbacks of the conventional methods, and allows filling with mortar without requiring f4 raising work such as sandbags, shortening the construction time and achieving significant cost reductions. 1! The purpose of the present invention is to provide a mortar filling method for secondary shield lining.

Hereinafter, details of the method of the present invention will be explained with reference to the drawings. FIG. 2 and subsequent figures illustrate one embodiment of the present invention. In the drawings, the same or corresponding parts as in FIG.

In the present invention, a dam bag 6 is used as a means for partitioning the mortar filling space. The dam bag 6 is constructed as a donut-shaped bag made of, for example, strong tent fabric or the like and has a diameter approximately the same as the inner diameter of the segment 1, and the steel pipe 2 is fitted into the space at the center of the donut shape. This dam bag 6 is formed into a donut shape by connecting elongated bags L7 through a fastening part 7, and a mortar injection pipe 4 for construction work and a mortar injection pipe 4 for construction are attached to the upper end where this fastening part is connected. A recess 9 is formed through which the air vent pipe 8 passes.

A plurality of hanging fittings 10 are still fixed at predetermined intervals on the front and back of the outer peripheral surface of the upper half of the dam bag 6. These hanging fittings 10 are connected to iron wires 11 as shown in FIGS. 3 and 4.
It is connected to the bolt 12 of the segment 1, etc.

There are still holes 1 on one side of the dam bag 6 narrowing the fastening part 7 and serving both for mortar injection and air release on the left and right sides.
3 is formed, and the periphery of this through hole 13 is surrounded by a ring-shaped metal fitting 14. The tips of hoes 715 for supplying foamed mortar or the like are fitted into these through holes 13 so as to reach them.

Next, a mortar filling method using the dam bag 6 having the above structure will be explained.1 First, as shown in FIGS. 2 and 3, it is
A dam bag 6 is attached to surround the steel pipe 2. At this time, as described above, the dam bag 6 is hung and attached to the bolt 12 side of the segment 1 by the iron wire 11 using the hanging metal fitting 10.

Subsequently, the tip of the hose 15 is fitted into the through hole 13.

Foamed mortar is supplied into the dam bag 6 through this hose 15. The foaming mortar injected into the dam bag 6 foams and gradually closes the dam bag 6 as shown in FIG.
! 3. Then fill the space between the segment 1 and the steel pipe 4 and seal it so that there is no space left.

Injection of mortar 5 into the partitioned space via mortar injection pipe 4 is started in a state where the space is completely sealed.

By the way, since only water is squeezed out from the surface of the dam bag 6, the strength of the mortar inside the bag after hardening is sufficient, so there is no need to remove it like with conventional sandbags. This is something that is buried and integrated with the mortar of the construction. In addition, the foam mortar should be placed in a dam bag 6.
After the injection is completed, it is necessary to remove the hose 15 and completely seal the passage hole 13.

In this way, we have adopted a method of performing secondary lining using dam bags into which foamed mortar is injected, so there is no need for the conventional work of piling up and removing sandbags, etc., which shortens the construction period. In addition, significant cost reductions can be achieved.

However, since the dam bag expands and completely fills the gap between the first segment and the steel pipe, there will be no inconvenience such as the mortar of the secondary lining flowing out from the gap.

As is clear from the above description, according to the present invention, a dam bag into which foamed mortar is injected is used as a means for partitioning a space where secondary lining is to be performed, and the dam bag is formed by the foamed mortar injected into the dam bag. The method uses a method in which the space between the segment and the steel pipe is inflated and then the secondary lining mortar is injected in a state where the space between the segment and the steel pipe is sealed, so there is no need for the conventional work of piling up and removing sandbags.
iJ is a construction method that allows the dam body to be buried, which saves labor, shortens the construction period, and significantly reduces costs.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a conventional method, Figs. 2 to 4 are for explaining an embodiment of the present invention, Fig. 2 is a front view of a state in which a dam bag is attached, and Fig. 3 is an explanatory diagram showing a conventional method. FIG. 4 is a side view of the bag with the dam bag attached, and a side view of the foamed mortar being injected into the bag. 1...Segment 2...Steel pipe 4...Mortar injection pipe 5...Mortar 6...Damming bag 8...Air vent pipe 9...Concavity lO・
...Hanging fittings 11-...Sheet number wire 12...Bolts 13...For through holes Request person
Yujibe Taka, Patent Attorney, Hazama Kumiyo Co., Ltd.

Claims (1)

[Claims] A hollow donut-shaped dam bag is placed between the segment and the buried pipe, and the dam bag is filled with VC foam mortar and expanded to form a hole between the segment and the buried pipe. Sea's Rudoni secondary lining and mortar filling method includes sealing the space and then injecting mortar for secondary lining between the segment and the buried pipe.