JPH0811920B2 - Formwork for tunnel lining - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork used for tunnel lining, and more particularly to a formwork suitable for secondary lining.

[0002]

2. Description of the Related Art In tunnel construction, usually, a tunnel wall excavated by a shield construction method or the like is subjected to a primary lining by a steel segment or the like, and then concrete is further placed on the lining. The next lining (finish lining) is performed. By the way, the concrete wall by the secondary lining is
As such, it is exposed to the outside as the inner wall of the tunnel, so it is necessary to finish it neatly using a formwork. Conventionally, a so-called removable slide form frame has been widely used as the form liner for the secondary lining, in which a plurality of divided steel form plates are slid by a jack to be assembled.

[0003]

However, according to the above-mentioned conventional slide type mold, since the weight of the mold plate is large, it takes a lot of labor and time to assemble it and move it to the lining area. There was a problem that the installation workability was extremely poor. In addition, since the diameter or shape of the tunnel is not always uniform over the entire length, it is necessary to prepare a dedicated template according to changes in the diameter or cross-sectional shape, which is cumbersome to manufacture and costs less. There was also a problem that the increase was inevitable.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a tunnel lining mold which has good workability in installation and can easily cope with a change in diameter or shape. To provide a frame.

[0005]

In order to achieve the above object, the present invention comprises a formwork main body formed by stacking a plurality of blocks made of expanded polystyrene, and a sheet covering the outer periphery of the formwork main body. It is characterized in that it is configured in.

[0006]

In the formwork for tunnel lining constructed as described above, since the block made of styrofoam is used as the base material of the formwork body, the weight thereof is extremely light and the formwork body is covered with the sheet. Combined with the simple structure, it is easy to assemble and move. Moreover, since the block can be easily manufactured by foam molding, it is possible to easily cope with changes in the diameter and cross-sectional shape of the tunnel.

[0007]

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

1 and 2, reference numeral 1 denotes a mold 1 according to the present invention, which is a cylindrical mold body 3 formed by stacking a plurality of blocks 2 made of styrofoam, and this mold body 3 Sheet 4 for covering the outer periphery of the pipe, and conduit 5 made of hard vinyl chloride resin penetrating the center of the form body 3
It is composed of and. Formwork body 3 is 6 here
Each block 2 consists of two blocks (2) located on the lower side (and) that occupy almost half the volume of the mold body 3, and two (and) located on the left and right sides of the upper part. Two (and) located at the center of the upper side are formed in a small size in the middle size. The form body 3 has, for example, a length of about 5M. The conduit 5 is used as a working passage, and as an example, a conduit having a diameter of 600 to 800 mm is used.

This formwork 1 is used for a secondary lining, and a segment (primary lining wall) 11 by the primary lining is already assembled on the inner surface of the tunnel 10. Hereinafter, it is assumed that the secondary lining wall 12 has already been cast using the main frame 1 on a part of the primary lining wall 11, and the secondary lining wall 12 is connected to the existing secondary lining wall 12 and newly added. The construction sequence for placing a secondary lining wall will be described.

At the time of secondary lining, first, the primary lining wall 1
A plurality of spacers (for example, made of concrete) 13 having the same height as the existing secondary lining wall 12 are attached in the circumferential direction and the axial direction by using a locking tool . Next, both ends are sewn to each other inside the spacer 13 to form the endless belt, and the sheet 4 is arranged. While expanding the sheet 4, the blocks 2 are stacked according to their numbers to assemble the frame body 3. More specifically, first, the two large blocks are seated on the spacer 13 via the seat 4. This time,
Since these two blocks occupy almost half the volume of the mold body 3, their positions are fixed simply by seating them on the spacer 13. Then, the conduit 5 is placed on the two blocks, and the upper two medium-sized blocks are further placed. Then, finally, small blocks are sequentially inserted into the upper gap, and by this insertion, the medium blocks are brought to a predetermined position, the sheet 4 swells in a tensioned state, and the mold body 3 is completed.

After that, the existing secondary lining wall 12 of the formwork 1 is formed.
An annular gable form 14 is arranged on the end face on the opposite side to and its position is fixed by, for example, a separator. Due to the disposition of the gable formwork 14, a concrete placing space 15 defined by the existing secondary lining wall 12 and the gable formwork 14 is formed between the formwork 1 and the primary lining wall 11. A concrete supply pipe 16 is previously connected to the gable form 14, and concrete is supplied to the concrete placing space 15 through the concrete supply pipe 16. Then, after filling the concrete placing space 15 with concrete, the main formwork 1 is dismantled after waiting for its solidification. The dismantling of the formwork 1 may be carried out by first pressing the small block or from one end face side and pulling it out from within the seat 4, whereby the entire formwork body 3 is loosened, and then the reverse of the above-mentioned assembly. If each block 2 is extracted in the order of, the disassembly can be easily performed.

In the above embodiment, the small block is inserted last to complete the mold body 3, but the conduit 5 may be inserted last. Furthermore, if a sheet with a pattern is used as the sheet 4, the pattern is transferred to the wall surface of the lining, so that the designability of concrete pouring is further improved.

[0013]

As described above in detail, according to the tunnel lining form according to the present invention, not only is it extremely lightweight, but the assembling structure is simple and the assembling and moving are easy. Installation workability is significantly improved, which greatly contributes to shortening the construction period. In addition, since the block constituting the mold body can be easily manufactured by foam molding, it is possible to easily cope with changes in the diameter and cross-sectional shape of the tunnel, which greatly contributes to the reduction of construction cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure and usage of a tunnel lining form frame according to the present invention.

FIG. 2 is a cross-sectional view showing the structure and usage of the tunnel lining form according to the present invention.

[Explanation of symbols]

 1 Formwork 2 Block 3 Formwork body 4 Sheet 5 Conduit 10 Tunnel 11 Primary lining wall 12 Secondary lining wall 13 Spacer 16 Gable formwork

Claims (1)

[Claims] 1. A formwork for tunnel lining, comprising a formwork main body formed by stacking a plurality of blocks made of expanded polystyrene and a sheet covering the outer periphery of the formwork main body.