JPS63233197A - Reaction device for shielding machine - 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 <Industrial Application Field> The present invention relates to a reaction force device for a shield machine for obtaining reaction force from a hardened lining.

<Conventional technology> The technology of constructing a tunnel by using formwork to pour concrete on-site in a tunnel immediately after excavation using a shield machine is widely known.

By the way, when constructing concrete by pouring it on-site, the problem is where to obtain the digging reaction force of the shield machine.

Currently, a method has been proposed in which the digging reaction force of a shield machine is obtained from the formwork.

<Problems to be Solved by the Present Invention> There are the following problems in how to take the reaction force of the shield machine described above.

(b) Taking reaction force from weak concrete will have a negative impact on the quality of the lining structure.

(b) It is not possible to remove the mold until the lining concrete has hardened.

As a result, work is suspended during this period, and construction periods tend to become longer.

OBJECT OF THE INVENTION The present invention has been made in order to solve these problems, and is to provide a reaction force of a shield machine that can obtain the digging reaction force of the shield machine without adversely affecting the lining structure. The purpose is to provide equipment.

Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

First, the main equipment used in this example will be explained.

<A> Shield machine An example of a shield machine 1 is shown in FIG.

This shield machine has a tail plate 12 protruding from the tail portion of the main body 11 at the rear of the main body 11.

The tail plate 12 is connected to a slide jack 13 fixed to the main body 11 so as to be slidable.

Further, the shield machine 1 is equipped with a formwork moving jack 14, an excavation jack 15, and a press shirt +16.

All these jacks 13 to 16 are arranged in plurality in the circumferential direction within the main body 1.

The tip of the digging jack 15 is connected to the reaction force device 2 for obtaining the digging reaction force of the shield machine 1.

As shown in Fig. 1.2, the reaction force device 2 includes a plurality of expansion/contraction tubes 2.
1, a connecting rod 22 having a telescopic function that connects these expandable tubes 21, and a running wheel 23 shown in FIG.

Each cylindrical expansion/contraction tube 21 is made up of two arc-shaped split rings 24 and a plurality of jacks 25 interposed between the two IJ rings 4, and each expansion/contraction tube 21 is It is configured to expand and contract its diameter.

In order to obtain the digging reaction force of the shield machine 1 from the reaction force device 2, a bracket 26 is provided at the front end of the reaction device 2 as shown in FIG. Connect one end of the rod 17.

In addition, in order to prevent buckling of the rod 17 of the digging jack 15, a support plate 18 having a hole through which the rod 17 can be inserted is provided on the inner peripheral surface of the movable formwork device 3, as shown in FIG. A plurality of support plates 18 are provided, and each support plate 18 supports a portion of the rod 17.

Further, the reason why the expansion/contraction tubes 21 are connected by a connecting rod 24 having an expansion/contraction function is to accommodate the bending of the L-channel.

<C> Movable formwork device (FIG. 1) The movable formwork device 3 consists of a formwork moving jack 14 and a movable formwork 31 connected to the formwork moving jack 14.

The movable formwork 31 consists of a liner plate and circumferential ribs.

The reason why the movable formwork 31 is not provided with ribs in the longitudinal direction of the tunnel is to reduce the rigidity in the longitudinal direction of the tunnel to accommodate the forming curve of the tunnel.

The movable formwork 31 moves forward by the expansion and contraction operations of the formwork movement jack 14.

2) Mobile shoring device The mobile shoring device 4 is a known shoring device that has a traveling means to prevent the structure from collapsing immediately after lining.

In addition, when the movable formwork apparatus 3 also serves as a shoring, the movable shoring bag W4 can be omitted.

Press ring (Fig. 1.3) The press ring 5 is an annular plate that cooperates with the movable form 3 to form a form. Assemble and use.

The press ring 5 has an IJ-shaped cross section and is composed of an inner ring 51, an outer ring 52, and a shielding plate 53 that connects the outer ring 52 and the inner rings 51 and 52.

The plate surface of the shielding plate 53 of the press ring 5 has a plurality of holes 54.

This hole 54 is a guide hole for penetrating the end of the tendon material 6 buried in the lining structure and guiding it out of the formwork.

Next, the construction method will be explained.

<A> Process for obtaining excavation reaction force (Figures 1 and 6) The reaction force device 2 is placed inside the already hardened lining 7, and then each expansion/contraction tube 21 is expanded in diameter to remove the hardened lining. Press it onto the lining 7.

One of the features of the present invention is that the reaction force is not obtained from the lining 7 that has been cast in the previous process and has not yet hardened, but rather from the lining 7 that has developed sufficient strength. .

Even if the reaction force device 2 is strongly pressed against the hardened lining 7, unlike concrete before hardening, there is no fear that the concrete will be adversely affected.

Entrance> Excavation process A reaction force is obtained from the reaction force device 2 that presses against the hardened lining 7, the excavation jack 15 is extended, and the shield machine 1
The main body 11 of the main body 11 is advanced toward the face side.

<C> Process of assembling the press ring After the shield machine 1 has finished moving forward, the excavation jack 15
is contracted to form a space in the tail plate 12 for assembling the press ring 5.

Next, the divided press ring 5 is carried in, and the press ring 5 is assembled into an annular shape inside the tail plate 12.

When assembling the press ring 5, as shown in FIG. 4, a separate tendon 6b is connected to each tendon 6a protruding from the lining 7 constructed in the previous step via a connecting tool 61a, and this tendon 6b Assemble the free end of the press ring 5 through the hole 54 of the press ring 5.

2〉Process of pouring concrete (Fig. 1.5) Next, a reaction force is obtained from the shield machine 1 to advance the movable formwork 31 toward the face side.

As a result, a shielded space is formed between the earth and the movable formwork 31.

Piping for concrete placement is performed, and concrete is press-fitted into the shielded space formed between the tail plate 12 and the movable formwork 31.

Step of applying prestress to the lining (Fig. 5) Next, the press jack 16 is extended and the concrete in the shielded space is pressurized with a predetermined pressure via the press ring 5.

When the press jack 16 is extended, the press ring 5 retreats in a direction that reduces the volume of the shielded space.

As a result, the concrete in the shielded space is pressurized and most of the excess water is drained away.

Furthermore, when the tail plate 12 is advanced toward the face side while continuing to pressurize the concrete, the concrete comes into close contact with other peaks.

In order to maintain the pressurized state of the lining 7 immediately after casting, a model or nut-type fixture 62 is attached to the tension member 6b protruding from the press ring 5 and fixed, and then the press jack 16 is contracted.

In this way, the prestress applied to the prelining 7 by the pressurizing force of the press jack 16 does not disappear and is maintained as it is.

Therefore, reinforcing materials such as reinforcing bars can be easily placed in the space created by contracting the press jack 16.

Step of moving the construction device (FIG. 7) Next, the diameter of each expansion/contraction tube 21 of the reaction force device 2 is reduced to expose the running wheels 23.

Next, the digging jack 15 is retracted and the reaction device 2 is advanced by one span toward the face.

While repeating each of the above steps, the lining 7 is successively extended and constructed alternately or in parallel with the excavation.

Note that the movable shoring device 4 moves to the face side every time one span of lining 7 is constructed.

<Effects of the Present Invention> Since the present invention is as explained above, the following effects can be obtained.

(a) The present invention is a system in which the digging reaction force of a shield machine is obtained from a hardened lining structure.

Therefore, there is no need to worry about it having a negative effect on the material performance of the completed lining structure.

(b) The forward movement of the shield machine and the construction of the lining can be carried out separately and independently.

Therefore, the overall construction efficiency is improved and the construction period can be shortened.

(c) Labor can be saved because the formwork, shoring, and reaction device can be mechanically slid.

Automation is also easily possible.

[Brief explanation of drawings]

1N: Explanation of an embodiment of the present invention. 2. Perspective view of the reaction force device. Figure 3. Explanation of the nib ring. Figure 4: Partial sectional view of the end of the lining. Figure 5:
Explanatory diagram when the lining lining is under pressure No. 6 N: Explanatory diagram when the diameter of the reaction device is expanded No. 7 Explanatory diagram when the reaction device is moved Fig. 6

Claims (1)

[Scope of Claims] In a shield machine that constructs a tunnel by pouring concrete on-site between the tunnel ground excavated by the shield machine and the formwork and lining the lining, an expansion/contraction system located within the hardened lining. A plurality of freely movable cylinders, an extendable rod that connects the plurality of cylinders in the axial direction, a jack interposed between the foremost part of the cylinders and the shield machine, and a jack and the cylinder inside the tunnel. A reaction force device for a shield machine, comprising: a rod for transmitting an extensional force arranged between the rod and a body; and a plurality of plate bodies for preventing buckling, ringed in the middle of the rod.