JP2001090478A - Open shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce time and labor thereby improving the workability permitting to suspend down a concrete box body accurately and easily to a predetermined position in a tail portion of an open shield machine when working by an open shield method or when working by the open shield machine combined with another method in which a drive process pushing out the concrete box body is performed by an initial pushing jack for each open shield machine. SOLUTION: As a facility 12 for suspending down a load such as a concrete box body 4 to the top of a machine body, a gantry frame 13 is erected and a suspending apparatus such as a chain block is attached to the gantry type frame 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open shield machine used in an underground structure construction method for constructing underground structures such as water and sewage, common ditches, laid underpasses such as telegraph telephones, etc. in urban areas. .

[0002]

2. Description of the Related Art The open shield method is a highly rational method utilizing the advantages of the open cutting method (open cut method) and the shield method. FIG. 5 shows an outline of the method.
Is an open shield machine, which is a shield machine having left, right and left side walls 1a and a bottom plate 1b connected to these side walls 1a, with front, rear and upper surfaces opened.

[0003] The open shield machine 1 includes the side wall plate 1a.
And the tip of the bottom plate 1b is formed as a cutting edge 11, and the side wall plate 1
The propulsion jacks 2 are arranged vertically rearward near the center or the rear end of a. In the figure, reference numeral 3 denotes a partition.

[0004] Although not shown, the open shield machine 1 is installed in the start pit, the propulsion jack 2 of the open shield machine 1 is extended, and a reaction force is applied to the reaction wall in the start pit to obtain the open shield machine 1. Is moved forward, the first concrete box 4 forming the underground structure is suspended from above, and set behind the propulsion jack 2 contracted in the tail portion 1c of the open shield machine 1. A strut is provided between the propulsion jack 2 and the reaction force wall to adjust the distance as appropriate.

Further, the starting pit is constituted by a retaining wall, and this retaining wall is partially mirror-cut in order to start the open shield machine 1. However, if necessary, a ground improvement is performed on a front portion of the starting pit by injection of a chemical solution or the like. May be given.

The excavator 9 such as a shovel excavates earth and sand from the front or upper surface of the open shield machine 1 and discharges the earth. Simultaneously with or after this earth removal step, the propulsion jack 2 is extended to move the open shield machine 1 forward. In the case of this advancing process, a pressing angle 8 composed of a frame using a box steel material or a mold steel is disposed in front of the concrete box 4.

[0007] The first concrete box 4
Before the second concrete box 4 is hung in the tail part 1c of the open shield machine 1. Hereinafter, the same excavation / discharge step, advance step, and setting step of the concrete box 4 are appropriately repeated, and the concrete box 4 is sequentially left in the ground as the open shield machine 1 moves forward. A backfill 5 is applied to the upper surface of the box 4.

When the concrete box 4 is hung in the tail section 1c of the open shield machine 1, a height adjusting member 7 such as a concrete block is provided under the concrete box 4, and the tail section 1c is hung. The grout material 6 is filled in the left and right and lower spaces of the concrete box 4 in the inside.

In this way, when the open shield machine 1 reaches the reaching pit, it is removed and the construction is completed.

The concrete box 4 is suspended in the tail portion 1c of the open shield machine 1 as described above, and exits from the tail portion 1c as the open shield machine 1 advances, and remains in the ground. However, the concrete box 4 is made of reinforced concrete, and as shown in FIG. 6, the left side wall 4a, the right side wall 4b, the upper floor 4c, and the lower floor 4
d, and the front and rear surfaces are opened as openings 10.

In such an open shield construction method, as described above, excavation and earth removal are performed by an excavator 9 such as a shovel installed on the ground, and the concrete box 4 is attached to the tail portion 1c of the open open shield machine 1. The set is also carried out by transporting the concrete box 4 to the vicinity of the tail part 1c by a bogie or a truck, lifting the concrete box 4 with a lifting machine such as a crawler crane installed on the ground, and then suspending the concrete box 4 in the tail part 1c.

In the case where the bridge crosses immediately below a structure such as a bridge girder or a large pipe, the excavator 9 or the lifting machine cannot be arranged at a location where the bridge girder or a large pipe is located, so that it is impossible to perform the open shield method. . Therefore, when constructing with the rational open shield method that takes advantage of the open-cutting method and the shield method, even if there is an obstacle such as a bridge girder above the construction point and crosses under it, the open shield method The open shield machine used is installed as it is, and the underground structure is constructed without being affected by this obstacle, and after passing the obstacle, the construction of the underground structure that can immediately proceed to the open shield method and continue the construction The following construction methods are available.

In this method, a main jack is installed in a starting pit, and when crossing below an obstacle, the front of the open shield machine is excavated and discharged, and a concrete box is installed together with the open shield machine in the starting pit. The propulsion process of extruding with a main push jack, arranging a new concrete box between the main push jack and the extruded concrete box and repeating the extrusion is combined with the open shield method.

In this construction method, the tail portion 1c of the open shield machine 1 is formed so as to be detachable, a main jack is installed on the tail portion 1c, and the tail portion 1c is cut off to form a starting pit. In this case, too, the concrete box 4 is suspended in the tail part 1c in the same manner as described above.

[0015]

In such an open shield method and a method including a propulsion process, the concrete box 4 is suspended from the tail portion 1c by a bogie or the like. After that, this is suspended by a crane installed on the ground. However, in the open shield construction method, as the open shield machine 1 moves forward, the suspension point of the concrete box 4 also moves forward. Must also be moved separately to move the installation position, and in some cases, it is necessary to adjust the suspension device to be located immediately above the suspension point, and it takes time and time to suspend the concrete box 4. It was troublesome and the workability was not good.

In the propulsion process in which the concrete box 4 is suspended and extruded from the tail section 1c as a starting pit, it is necessary to secure a crane installation location and to set the crane to this position, which also has poor workability. Was something.

An object of the present invention is to solve the inconvenience of the prior art, and to carry out the construction by the open shield construction method or the combination of the open shield construction method and the propulsion step of pushing the concrete box together with the open shield machine with the main push jack. When a concrete box is hung on the tail of an open shield machine, it can be reliably and easily hung at a predetermined position, reducing time and labor and improving workability. Is to provide.

[0018]

In order to achieve the above object, the present invention firstly sets up a portal frame as a facility for suspending members such as a concrete box on the upper part of an airframe. The gist is that a suspension device such as a chain block is attached to the frame.

Second, the suspension equipment is installed at the tail of the fuselage. Third, the suspension equipment is to separately attach the concrete box and the press bar.
The gist of the portal frame is to have a space below which a transport vehicle such as a bogie or a truck can enter.

According to the first aspect of the present invention, the equipment for suspending a member such as a concrete box is fixed and installed above the body of the open shield machine, so that the open shield machine moves forward by the open shield method. In addition, since the hanging equipment also moves forward integrally, there is no need to move the crane to the hanging place as in the conventional case, and the workability is good.

Further, since the hanging equipment has a portal frame erected on the upper part of the body and a suspension device such as a chain block attached to the portal frame, the hanging equipment is fixed to an open shield machine. Even if you do
A space is secured above it so that other work is not hindered.

According to the second aspect of the present invention, in addition to the above-described operation, the suspension equipment is installed at the tail part of the fuselage. Even in the case of a starting pit, a concrete box can be hung in the tail part which is the starting pit.

According to the third aspect of the present invention, in addition to the above-mentioned operation, the suspension device is provided between the concrete box and the propulsion jack by separately mounting the concrete box and the press bar. When setting the press bar, it can be done easily and reliably.

According to the fourth aspect of the present invention, in addition to the above-described operation, a space is provided below the portal frame where a transport vehicle such as a bogie or a truck can enter. By moving the loaded truck or trolley here, the concrete box or the like can be easily suspended from the truck or other carrier using a suspension device.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of the open shield machine of the present invention. The basic configuration and the open shield method of the open shield machine 1 are as already described with reference to FIG.

In the open shield machine 1 of the present invention, as a hanging equipment 12 for hanging members such as the concrete box 4 and the press bar, a portal frame 13 made of H-shaped steel or the like is provided on the upper part of the tail 1c. And a suspension device 14 such as a chain block was attached to the portal frame 13.

As shown in FIG. 1, the suspension device 14 may be provided with only a vertical winch 14a which only moves up and down for suspending the concrete box 4, but as shown in FIG. Aside from the up-and-down winch 14a, a chain block 14b that can be moved laterally for hanging a press bar can also be provided side by side.

As shown in FIG. 2 which is a cross-sectional view taken along the line AA of FIG. 1, the width between the columns 13a made of H-shaped steel constituting the left and right frames of the portal frame 13 is different from that of the concrete box 4.
Is slightly larger than the width of
As shown in FIGS. 1 and 2, a space is formed between the upper beam 13a and the upper beam 13b so that a transport vehicle 15 such as a bogie or a truck can enter below.

Next, the operation will be described. The open shield machine 1 is advanced in the same manner as in the above-mentioned conventional example, and a space is secured in the tail portion 1c in front of the already installed concrete box 4. In this state, the portal frame 13 and the suspension device
Since the hanging equipment 12 provided with 14 is fixed to the upper part of the tail part 1c, the hanging equipment 12 also advances with the open shield machine 1.

Then, as shown in FIG. 1, a transport vehicle 15 such as a truck having the concrete box 4 loaded on the loading platform is advanced under the portal frame 13, and the vertical winch 14a is moved up and down to move the concrete on the loading platform. The box 4 is lifted from the carrier, and then the transport vehicle 15 is moved out of the portal frame 13, and then the vertical winch 14a is lowered to place the next concrete box 4 in front of the already installed concrete box 4. 4 is suspended in the tail portion 1c of the open shield machine 1.

The above operation is repeated, and the concrete box 4 is sequentially suspended in the tail portion 1c while the suspension equipment 12 is moved forward together with the open shield machine 1. When the press bar 17 is set on the front part of the concrete box 4 as shown in FIG. 4, it is suspended using a chain block 14b which can be moved laterally.

When crossing a bridge girder or a structure such as a large pipe directly below a structure, an excavator or a lifting machine cannot be arranged at a location where the bridge girder or a large pipe cannot be used. The tail portion 1c is separated from the front portion 1d, and the tail portion 1c is used as a starting pit. As shown in FIG. 3, a main push jack 16 is installed in the tail portion 1c. The box 4 is extruded, a new concrete box 4 is disposed between the original pushing jack 16 and the extruded concrete box 4, and the concrete box is propelled by repeating the disposing and pushing of the concrete box 4. Place body 4.

In the case of such a propulsion process, the suspension equipment
Since 12 is fixed to the tail portion 1c, the concrete box 4 can be reliably set at a predetermined position using the tail portion 1c as a starting pit.

[0034]

As described above, the open shield machine of the present invention is constructed by the open shield construction method or combined with the open shield construction method by the propulsion process of pushing the concrete box together with the open shield machine with the original pushing jack. When constructing by the construction method, when hanging the concrete box on the tail part of the open shield machine, since the suspension equipment is fixed to the tail part, when the tail part moves by the advance of the open shield machine, In any case where the tail section is separated and used as a starting pit, it can be reliably and easily suspended at a predetermined position in a short time, and time and labor can be reduced, thereby improving workability.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of an open shield machine of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1, showing a first embodiment of the open shield machine of the present invention.

FIG. 3 is a sectional view taken along the line BB of FIG. 1 showing the first embodiment of the open shield machine of the present invention.

FIG. 4 is a vertical sectional side view showing a second embodiment of the open shield machine of the present invention.

FIG. 5 is a vertical sectional side view showing an outline of the open shield method.

FIG. 6 is a perspective view of a concrete box used in the open shield method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a ... Side wall board 1b ... Bottom board 1c ... Tail part 2 ... Propulsion jack 1d ... Front part 3 ... Partition wall 4 ... Concrete box 4a ... Left side wall board 4b ... Right side wall board 4c ... Upper floor board 4d ... Lower floor board 5 Backfilling 6 Grouting material 7 Height adjusting material 8 Pushing angle 9 Excavator 10 Opening 11 Cutting edge 12 Hanging equipment 13 Gate system 14 Hanging device 13a Column 13b Beam 14a ... Vertical winch 14b ... Chain block 15 ... Transport vehicle 16 ... Main jack 17 ... Press bar

Claims (4)

[Claims] An open frame, wherein a portal frame is erected as a facility for suspending a member such as a concrete box on the upper part of the body, and a suspension device such as a chain block is attached to the portal frame. Shield machine. 2. The open shield machine according to claim 1, wherein the suspension equipment is installed at a tail portion of the body. 3. The open shield machine according to claim 1, wherein the suspension device separately attaches a concrete box and a press bar. 4. The portal frame has a space below which a transport vehicle such as a truck or a truck can enter.
An open shield machine according to any one of claims 1 to 3.