JPS62121299A - Method for covering casting of tunnel and shield excavator used therein - 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 (a) Industrial Field of Application The present invention relates to a tunnel lining, which is used when forming a tunnel lining with cast-in-place concrete, which has been cut by a shield excavator. This invention relates to a pouring method and a shield excavator used therefor.

(b), Prior Art Recently, a proposal has been made to form the lining of a tunnel excavated by a shield excavator using cast-in-place concrete to avoid the complicated and time-consuming assembly work of segments. There is.

(C) 0 Problems to be Solved by the Invention However, when constructing a lining with cast-in-place concrete, the lining to be constructed has a number of issues such as the position of reinforcing materials in the concrete and the thickness of the lining. , shall be constructed to design dimensions. However, the procedure for placing such a tunnel lining has not yet been established, and therefore it is difficult to accurately perform the pouring and forming work of the tunnel lining using cast-in-place concrete. There was a desire to develop a shield excavator for use.

In view of the above-mentioned circumstances, the present invention provides a method for constructing a tunnel lining that can accurately determine the installation position of reinforcing materials, the thickness of the lining, etc., and a shield excavator used therein. The purpose is to

(d) Means for solving the zero problem, that is, the tunnel lining casting method of the present invention is a means for positioning and holding the reinforcing material (15) on the ram (6a) of the propulsion jack (6). ), and when the lining (11) is cast and constructed, a reinforcing material is installed between the positioning and holding means and the already constructed lining (11), and then the formwork (17) is moved by a propelling jack ( The rams (6a, 7a) of 6, 7) hold the formwork through the formwork positioning means (16), and concrete is poured into the concrete placement space (19) formed thereby to form the lining (11). It is configured by constructing.

Further, in the invention of the shield excavator, reinforcing material (15) is attached to the rams (6a, 7a) of the propulsion jack (6, 7).
positioning and holding means (6b), and furthermore, the formwork positioning means (16) is connected to the propelling jacks (6, 7).
) is configured to be detachably attached to the rams (6a, 7a).

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. The following r (el
The same applies to the column ``, action''.

(e) 0 effect With the above-described configuration, the present invention allows the reinforcing material (15) to be held at an appropriate position by the positioning and holding means (6b), the formwork (17) to be held at an appropriate position by the formwork positioning means (16), and the design It acts so that the lining (11) can be constructed according to the dimensions.

(f), Example Embodiments of the present invention will be described below based on the drawings.

1 to 5 are process diagrams showing an embodiment of the tunnel lining construction method according to the present invention, FIG. 6 is a sectional view showing an embodiment of the shield excavator according to the present invention, and FIG. 7 ( It is a sectional view of the tunnel.

As shown in FIG. 6, the shield excavator 1 has an outer shell 2 formed into a cylindrical shape as a whole, and a cutter 3 is rotatably driven by a drive motor 5 on the left side of the outer shell 2 in the figure. It is set freely. Inside the outer shell 2, a plurality of propulsion jacks 6.7 are provided in a concentric double layer along the circumference of the outer shell 2, and each propulsion jack 6.7 has a ram 6a,
7a is provided so as to be able to protrude and retreat in the directions of arrows A and B.

At the tip of the ram 6a of the propulsion jack 6 on the inside and outside of the propulsion jack 6.7, that is, on the outer shell 2 side, as shown in FIG.
A positioning groove 6b is formed in the reinforcing iron plate, and a tail void injection device 9 is provided at the right end of the outer shell 2 in FIG. 6, that is, at the rear end of the shield excavator 1.

Since the shield excavator 1 has the above configuration,
When excavating the tunnel 10 with a shield excavator], as shown in FIG. The outer shell 2 is pushed in the direction A by protruding and using the already constructed lining 11 and formwork 17 as scaffolding. When the outer shell 2 is pressed in the entry direction, the cutter 3 is pushed in the direction of the face 13 with a predetermined penalty pressure, thereby excavating the earth and sand at the face. When the earth and sand in the face 13 portion is excavated, the outer shell 2 is propelled in the direction A by the pressing force of the propulsion jack 6.7 by the amount that the face 13 is excavated, and the tunnel 10 is formed. The propulsion jack 6.7 drives the rams 6a and 7a to protrude in the B direction in accordance with the moving speed of the outer shell 2 while the outer shell 2 moves a predetermined distance Lll in the A direction.
A predetermined one-bending cutting pressure is always applied to the cutter 3.

In this way, when the tunnel 10 has been excavated by a predetermined distance fiL1 in the direction A, as shown in FIG.
7a is retreated in the direction A, and the reinforcing iron plate 15 is installed together with the end stop 20 between the reinforcing iron plate 15 installed in the already constructed lining 11 and the positioning groove 6b of the ram 6a.

This reinforcing iron plate 15 has a flat plate part 15a formed in a plate shape with a width L2 and a large number of studs 15b planted on the flat plate part 15a. As shown, it is formed into an arcuate shape that matches the shape of the lining 11 to be cast and formed.

Further, since a positioning groove 6b for positioning and supporting the reinforcing iron plate 15 is formed in the ram 6a, the reinforcing iron plate 15 is placed in the positioning groove 6b as shown in FIG. By fitting and engaging the right end portion 15d, and further connecting the right end portion 15d to the tip of the reinforcing iron plate 15 installed and fixed in the constructed concrete with bolts or the like,
The reinforcing iron plate 15 must be securely installed and supported at a predetermined position, as shown in FIGS. 6 and 7. Note that a large number of holes (not shown) are drilled through the flat plate portion 15a of the reinforcing iron plate 15 in order to ensure the flow of concrete.

After the plurality of reinforcing iron plates 15 have been installed as shown in FIG. 7, a gauge ring 16 for positioning and holding the formwork is placed at the lower end of the ram 6a of the propulsion jack 6, as shown in FIG. Attach using bolts, etc. This gauge ring 16 is formed in an annular shape following the shape of the lining 11 to be cast, and on the right side in FIG.
The positioning groove 16a is similarly formed in an annular shape. Therefore, when the assembly form 17 is installed along the positioning groove 6b, an annular concrete placement space 19 is formed between the outer shell 2 and the assembly form 17. As already mentioned, the assembly formwork 17 is arranged and positioned along the positioning groove 16a, so that the concrete placement space 19 has a predetermined thickness T.
(See FIG. 6) is formed in such a way that it is held uniformly over the entire circumference between it and the outer shell 2.

In this state, the gauge ring 16 is pressed in the direction B by the ram 7a, and as shown in FIG. Place and pour concrete. At this time, a pie break 22 is attached to an appropriate position corresponding to the concrete pouring space 19 of the assembly form 17, and vibration is applied to the concrete poured into the concrete pouring space 19, so that the concrete is poured in every corner. Make sure it is filled to the top.

In this way, concrete is placed in the concrete placement space 19, and when the placed concrete has solidified, the shield excavation@1 rotates the cutter 3 and restarts the excavation operation in the direction of arrow A. . At this time, as already mentioned, the rams 6a and 7a of the propulsion jack 6.7
protrude in the direction of arrow B in FIG. Therefore, filler is injected into the tail void from the tail void injection device 9 to prevent the collapse of the ground 23. In this way, while filling the tail void, the ram 6a,
7a in the direction A and continue with the previously constructed lining 11, as shown in Fig. 1, a new lining 11 is constructed.
construction work begins.

(g) 0 Effects of the Invention As explained above, according to the present invention, the ram 6a of the propulsion jack 6 is provided with positioning and holding means for reinforcing materials such as the reinforcing iron plate 15, such as the positioning groove 6b, and the lining 11 At the time of pouring and construction, a reinforcing material is installed between the positioning and holding means and the already constructed lining 11, and then the formwork such as the assembly formwork 17 is gauged by the rams 6a and 7a of the propelling jack 6.7. Since the structure is configured such that the lining 11 is constructed by holding the formwork through a formwork positioning means such as a ring 16 and pouring concrete into the concrete placement space 19 formed thereby, the reinforcing material is held by means of positioning and holding means such as the ring 16. Furthermore, the formwork can be installed at the appropriate position according to the design dimensions using the formwork positioning means, and the lining with cast-in-place concrete 1
It is possible to accurately carry out the pouring and forming work in step 1.

Furthermore, if the reinforcing iron plate 15 having the flat plate part 15 is used as a reinforcing material, the reinforcing material can be installed through the plate-shaped flat part 15, compared to the case where ordinary reinforcing bars or the like are used as the reinforcing material. Therefore, the workability is good, and since work such as bending of reinforcing bars on site can be eliminated, it is possible to carry out the casting work quickly.

Furthermore, if the shield excavator is constructed by providing a means for positioning and holding the reinforcing material such as a positioning groove 6b on the ram of the propulsion jack, the reinforcing material can be easily installed by the positioning means.

Furthermore, if the formwork positioning means is provided to be detachably attached to the ram of the propulsion jack, by attaching the formwork positioning means when installing the formwork 17, the formwork 1
7 can be placed in the correct position.

[Brief explanation of drawings]

1 to 5 are process diagrams showing an embodiment of the tunnel lining construction method according to the present invention, FIG. 6 is a sectional view showing an embodiment of the shield excavator according to the present invention, and FIG. It is a sectional view of a tunnel. 1... Shield excavator 6.7... Propulsion jacks 6a, 7a... Ram 6b... Positioning and holding means (positioning groove) 10
...Tunnel 11 ... Lining 15 ... Reinforcement iron plate 15a ... Flat plate part 16 ... Formwork positioning means (gauge ring) 19 ...
...Concrete pouring space Applicant Mitsui Construction Co., Ltd. Agent Patent attorney Phase 1) Shinji (and 1 other person) -1,j”

Claims (3)

[Claims] (1) When constructing a lining with cast-in-place concrete for a tunnel excavated by a shield excavator equipped with a propulsion jack, the ram of the propulsion jack is provided with means for positioning and holding the reinforcing material, and the lining is During construction, reinforcing material is installed between the positioning and holding means and the already constructed lining, and then the formwork is held by the ram of the propulsion jack via the formwork positioning means, whereby the formed A method for placing a tunnel lining in which the lining is constructed by placing concrete in a concrete placement space. (2) A shield excavator equipped with a propulsion jack, wherein the ram of the propulsion jack is provided with means for positioning and holding a reinforcing material. (3) A shield excavator equipped with a propulsion jack, wherein a formwork positioning means is detachably attached to the ram of the propulsion jack.