JPH0668238B2 - Cast-in-place lining shield machine - Google Patents

Description

The present invention relates to a cast-in-place lining shield machine used for tunnel construction or the like.

[Conventional technology]

Conventionally, as a method of performing cast-in-place lining behind the shield machine, an inner formwork was assembled inside the tail plate, and the shield form machine body side of the inner formwork was closed by the wife formwork. Placing concrete for lining between frames is performed.

By the way, in such a conventional cast-in-place lining shield machine, the gable formwork and a plurality of excavation jacks are integrated, and for the placed fresh concrete, the entire gable formwork is pressurized, Methods have been developed to push the concrete out of the ground or dewater the concrete under pressure to quickly remove the gable formwork.

[Problems to be Solved by the Invention]

However, the above-mentioned conventional technique has the following problems.

In the case of pressing the gable formwork by pressing the gable formwork as a whole, the gable formwork inevitably moves to the concrete side and deforms the reinforcing bars and the like.

Since the inner form and the end form cannot be fixed to each other, when the concrete pressure is unbalanced, the end form is inclined and it is often impossible to press well.

Since the wife formwork and the propulsion jack are integrated, the propulsion jacks cannot be refilled alternately when the inner formwork is refilled, and the shield machine may cause buckling.

In order to press the gable formwork as a whole and push the concrete out into the ground, a large amount of pressure is required and the structure becomes complicated.

The present invention has been made to solve the above problems, and can pressurize without deforming the reinforcing bar or tilting the gable form, and can cause buckling when refilling the inner form. Aims to provide no shield machine.

[Means for Solving the Problems]

Hereinafter, the outline of the present invention will be described using the reference numerals of the drawings corresponding to the embodiments.

The present invention is a cast-in-place lining shield machine,
The gable form 3 has a plurality of unit gable forms 3a to 3d in the circumferential direction of the tunnel.
.. are divided into and are attached to the rear ends of the propulsion jacks 5, 5, ...
Is provided with a plurality of pressure jacks 4, 4, ... For pressurizing the fresh concrete placed between the tail plate 2 and the inner formwork 8, and a joint for connecting the vertical streak 6 to the rear end face thereof. A required number of joint muscle insertion holes 11, 11 ... For inserting the muscles 10, 10 ... Are bored.
The pressure jacks 4, 4, ... Are the propulsion jacks 5,
5 ... operates independently, and each pressure jack 4 also operates independently.

With such a configuration, the gable form 3 is divided into a plurality of unit gable forms 3a to 3d in the circumferential direction of the tunnel, so that the inner formwork 8 and the propulsion jack 5 can be rearranged in the unit gable form. frame
Depending on the number of 3a to 3d ..., it is possible to divide the construction into a plurality of times for construction. Therefore, the excessive stress exerted on the shield machine as seen in the conventional shield machine that moves the entire gable form 3 at one time during refilling is eliminated, and buckling is prevented.

In addition, the above-mentioned gable formwork 3 as a whole is driven by jacks 5, 5, ...
The adverse effect of pressurizing by is eliminated, and the fresh concrete can be effectively pressed by adjusting the individual pressure jacks 4.

Further, each unit gable form 3a to 3d has a joint reinforcement insertion hole 11 drilled therein, and fresh concrete is placed with the joint reinforcement 10 inserted in the hole, so when refilling, the last time Since the joint bar 10 is projected from the end face of the placed concrete, the vertical reinforcing bar 6 can be connected completely and easily when arranging.

〔Example〕

 Next, the illustrated embodiment will be described.

FIG. 1 is an overall view of the shield machine of the present invention (as an example, an earth pressure balance type center folding type shield machine), which excavates at the tip of the shield machine body 1 and expands and contracts the propulsion jack 5. Tail plate 2 while propelling by
The lining is made by cast-in-place concrete 13 at the rear of the, and the backing material 15 such as mortar is injected from the injection pipe 14 provided inside the tail plate 2 between the lining and the ground to construct a tunnel. In the figure, 16 is a screw conveyor for carrying out excavated earth and sand of a face, and 7 is an erector for assembling the inner formwork 8. A rear end of the propulsion jack 5 is connected to a gable form 3 located inside the tail plate 2, and the shield form machine main body 1 is secured by taking a reaction force to the inner form 8 and the cured rear lining concrete 13. Can be promoted.

FIG. 2 is a view of the gable form 3 as seen from the rear of the tunnel, and corresponds to the II-II cross section of FIG. In this embodiment, the gable form 3 is divided into four unit gable forms 3a to 3d, and a plurality of pressure jacks 4 for applying pressure to the fresh concrete that has been placed in each are provided. (The number of divisions of the gable form can be set to the most advantageous number depending on the size of the shield machine.) The four divided gable forms 3a to 3d must be individually moved or pressed by the propulsion jack 5. Moreover, each concrete pressure jack 4 can be operated independently of the propelling jack 5.

FIG. 3 shows the details of the shield tail portion, and corresponds to the III-III cross section of FIG. In this example, a tapered inner plate 2a is attached to the inner side of the tail plate 2 as an outer frame of the lining. The taper is provided to deal with curved construction. As shown in the figure, when placing concrete, the propulsion jack 5
The gable formwork 3 connected to can be applied directly to the inner formwork 8. A pressure gauge 9 is attached to the pressure jack 4 provided in the gable form 3.
The pressure jack 4 can be expanded and contracted to pressurize the concrete or adjust the pressure. In the figure, 17 is a tail plate for preventing the backing material 15 from leaking to the shield machine main body 1 side.

FIG. 4 shows the divided unit gable form 3d (same for 3a to 3c), and FIGS. 5 and 6 show V- of FIG. 4, respectively.
It corresponds to the V section and the VI-VI section. As shown in FIG. 5, a joint reinforcement insertion hole 11 is formed in the end form 3, and the joint reinforcement 10 is inserted prior to placing the lining concrete. Further, as shown in FIG. 6, the seal plate 17 provided on the end form 3 is slidable in a horizontal direction with respect to the presser piece 18 so as to cope with curved construction.

FIGS. 7 (a) to 7 (c) show an example of refilling during construction.

After the excavation is completed, as shown in FIG. 7 (a), by contracting the propulsion jack 5 for one unit gable form 3a,
The unit gable form 3a is retracted to the face side to the position where the reinforcing bar such as the vertical reinforcing bar 6 is assembled. Next, as shown in FIG. 5, the joint streak 10 is inserted into the joint streak insertion hole 11 provided in the unit gable form 3a. Next, the vertical reinforcing bar 6 is connected between the inserted joint bar 10 and the joint bar projecting from the end of the concrete 13 which has been cast and hardened last time, and the reinforcing bar is assembled together with the reinforcing bar such as the horizontal bar. After that, the inner formwork 8 is assembled using the erector 7, and FIG.
As shown in FIG. 5, the propelling jack 5 is extended again to fix the end form 3a to the inner form 8. By fixing the propulsion jack 5, the unit gable form 3a and the inner form 8 to each other, the pressure applied to the face can be transmitted to the inner form 8, and the pressure can be further applied to the concrete 13 in the rear. By telling, the buckling of the shield machine is prevented. Less than,
By performing this work on the next unit gable forms 3b, 3c, 3d one after another (see FIG. 7 (b)), while preventing buckling of the shield machine, the form 8 and Refill the propulsion jack 5.

After the refilling of the inner formwork 8 is completed, concrete is placed in the formwork, and after the placement of the concrete is completed, the pressure gauge 9 attached to the pressure jacks 4 attached to the unit gable forms 3a to 3d is used. , The pressure of concrete 13 is detected. Then, among the plurality of pressure jacks 4, an arbitrary pressure jack 4 in the vicinity thereof
Is expanded and contracted to pressurize or depressurize the concrete 13 to a predetermined pressure. At this time, even if an imbalance of pressure occurs in the end form 3, since only the pressure jack 4 in the vicinity thereof is operated, the concrete 13 is pressed without displacement of the end form 3 main body. be able to.

〔The invention's effect〕

(1) Since the end form is divided into a plurality of unit end forms in the tunnel circumferential direction and attached to the rear end of the propulsion jack,
The inner formwork and propulsion jack can be refilled in multiple times according to the number of unit gable formwork, and the excessive stress on the shield machine is eliminated and buckling is prevented. It

(2) Since the unit gable formwork is equipped with a plurality of pressure jacks, the fresh concrete can be effectively pressurized by operating each pressure jack without moving the gable formwork body, and concrete pouring can be performed. It becomes easier to deal with pressure fluctuations and volume fluctuations over time.

(3) The unit gable formwork has a hole for inserting the joint reinforcement, and fresh concrete is placed with the joint reinforcement inserted in the hole, so at the time of refilling, the joint reinforcement is inserted from the end face of the concrete that was placed last time. Is protruding, so that the vertical reinforcing bars can be connected completely and easily when arranging.

[Brief description of drawings]

1 is a sectional view in the tunnel direction showing an embodiment of the cast-in-place lining shield machine of the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a sectional view taken along the line III-III in FIG. FIG. 4 is an enlarged cross-sectional view of the cross section, FIG. 4 is a view of the unit gable formwork in this embodiment as seen from the rear of the shield machine, and FIG. 5 is V- of FIG.
6 is an enlarged cross-sectional view taken along line VI-VI in FIG. 4, and FIGS. 7 (a) to 7 (c) are inner formwork and propulsion jack in the construction by the shield machine of the present invention. FIG. 6 is a cross-sectional view in the tunnel direction showing how the refilling is performed. 1 ... Shield machine main body, 2 ... Tail plate, 2a
...... Inner plate, 3 ...... Wife form, 3a, 3b, 3c, 3d…
… Unit gable form, 4 …… Pressure jack, 5 …… Propulsion jack, 6 …… Vertical rebar, 7 …… Elector, 8 …… Inner form,
9 …… Pressure gauge, 10 …… Joint muscle, 11 …… Joint muscle insertion hole, 13 …… Concrete, 14 …… Injection pipe, 15 ……
Backing material, 16 …… Screw conveyor, 17 …… Seal plate, 18 …… Presser fitting.

Claims (1)

[Claims] 1. A concrete for lining is fitted between the tail plate and the inner mold in a state where an inner mold is assembled inside the tail plate, and the shield machine main body side of the inner mold is closed by a gable mold. In a cast-in-place lining shield excavator configured for casting, the gable formwork is divided into a plurality in the circumferential direction of the tunnel and attached to the rear end of the propulsion jack, and each gable formwork is independent of the propulsion jack. A cast-in-line digging machine with a plurality of pressure jacks that presses the concrete that has been placed in operation and has a joint insertion hole at the rear end surface.