JP7264948B2 - open shield machine - Google Patents

Description

The present invention relates to an open shield machine used in an open shield construction method.

The open shield construction method is a rational construction method that takes advantage of the advantages of the open cut construction method (open cut construction method) and the shield construction method. The outline is shown in FIGS. 10 to 13. FIG. In the figure, reference numeral 1 denotes an open shield machine, which is a shield machine with a U-shaped body having left and right side wall plates 1a and a bottom plate 1b connected to the side wall plates 1a and having an open front, rear, and top surface.

In this open shield machine 1, the ends of the side wall plate 1a and the bottom plate 1b are formed as a cutting edge 11, and the driving jacks 2 are vertically arranged facing rearward at the center or near the rear end of the side wall plate 1a. In the figure, 3 indicates a partition wall.

In this manner, the open shield machine 1 divides the U-shaped fuselage into a plurality of parts in the longitudinal direction, and the front end of the rear fuselage as the tail part is fitted into the rear end of the front fuselage as the front part. It is made bendable at the junction. The front part is mainly used for excavation, and the tail part is used to install a concrete box.

14 and 15 show an outline of the open shield construction method using the open shield machine 1. FIG.

Although not shown, the open shield machine 1 is installed in the starting pit, the propulsion jack 2 of the open shield machine 1 is extended, and the reaction force is applied to the reaction wall in the starting pit to move the open shield machine 1 forward. , the first concrete box 4 forming an underground structure in the box installation portion is lowered from above and set behind the retracted propulsion jack 2 in the tail portion 1c of the open shield machine 1. - 特許庁A strut is provided between the propelling jack 2 and the reaction wall to appropriately adjust the spacing.

In addition, the starting hole is composed of a retaining wall, and in order to start the open shield machine 1, a part of this retaining wall is cut off. Sometimes I leave.

In the excavation section, which is the front section, earth and sand are excavated from the front surface or upper surface of the open shield machine 1 by an excavator 9 such as a backhoe and discharged.

Simultaneously with or after this earth discharging process, the propelling jack 2 is extended to move the open shield machine 1 forward. In the case of this forward process, a push angle 8 made of a frame using box steel or shaped steel is arranged in front of the concrete box 4, and the open shield machine 1 receives the reaction force from the concrete box 4 set in the rear. Take.

Then, in front of the first concrete box 4, the second concrete box 4 is lowered to the box installation part within the tail part 1c of the open shield machine 1. - 特許庁

Thereafter, the same earth-discharging step, advancing step, and setting step of the concrete box 4 are repeated as appropriate, and the concrete boxes 4 are sequentially left in the ground in series as the open shield machine 1 advances, and furthermore, the concrete boxes are left in the ground. Put backfill soil 5 on top of 4.

When the concrete box 4 is lowered into the tail portion 1c of the open shield machine 1, a height adjusting member 7 made of a concrete block or the like is placed under the concrete box 4 (not shown), and the tail portion is lowered. In 1c, the back-filling injection material 6 is filled into the left, right, and lower gaps of the concrete box 4 .

In this way, when the open shield machine 1 reaches the arrival pit, it is removed to complete the construction work.

In such an open shield construction method, as described above, the concrete boxes 4 are left in the ground in a column as the open shield machine 1 advances, and the concrete boxes 4 are suspended in the tail portion 1c of the open shield machine 1. As the open shield machine 1 moves forward, it comes out of the tail part 1c and is left in the ground. Advance.

The concrete box 4 is made of reinforced concrete, and as shown in FIG.

The above prior art is common practice among those skilled in the art and does not relate to inventions known in the literature.

In the figure, 17 is a rear earth retaining plate, which is movably attached to the rear end of the tail portion 1c with a hinge, as described in the following patent document, to prevent the earth from collapsing.

The rear earth retaining plates 17 are arranged in parallel in pairs at the left and right positions of the open shield machine 1, and the partition plates 16 are interposed orthogonally by hinge connection between them.
Japanese Patent No. 5989863

Reference numeral 22 in the figure denotes a ladder for going up and down to the upper part of the concrete box.

In construction by such an open shield construction method, as shown in FIG. However, the concrete box was suspended from the tail of the open shield machine, and during installation, a rough terrain crane for hanging the box and a transport truck that transported the concrete box were placed behind. Become.

During excavation, workers on the ground guide the dump truck for loading and unloading the surplus soil placed in front of the shield machine, the hand of the backhoe for excavation, and survey assistance for excavation control during excavation by the open shield machine.

During the installation work of the concrete box, the rough terrain crane placed behind the open shield machine installs the hanging hardware for lifting the box, and the turning guidance signal for the concrete box lifted by the rough terrain crane is performed.

In addition, we also perform work such as compacting the soil that has been backfilled in the upper part of the box that has already been laid behind the open shield machine, and visually confirming the filling of the backfilling material from the ground at the tail part of the open shield machine.

Furthermore, when filling the back-filling injection material, it may enter the concrete box to be laid and fill the back-filling injection material from the box.

In addition to the above work, there are various other works, and depending on the scale of construction, these works are carried out by a small number of people, about 3 to 4 people, so each work cannot be done exclusively, and each work is open shielded. Frequent traversals are often made from the front of the fuselage through the open shield fuselage sides directly aft, or from the aft through the open shield fuselage sides directly forward.

For this reason, it is assumed that not only will work efficiency decrease due to movement, but also the risk of contact with heavy machinery, etc., placed respectively, will increase due to moving back and forth in front and behind the open shield machine.

In this way, when a worker tries to go back and forth between the left and right sides of the open shield machine, there is a concern that work efficiency will be reduced if the worker moves around the front upper part of the shield machine or the back of the shield machine.

When confirming the filling status of the backfill secondary injection, there is a safety concern because confirmation by looking in from the side of the shield machine requires leaning over the opening. In addition, since the rear earth retaining plate is also used for backfilling, there is a concern that it may come into contact with heavy equipment for backfilling.

When moving on the box installed in the tail part of the shield machine, a ladder is attached behind the tail part, but there is no movement path to the ladder.

Visual confirmation of the filling status at the time of filling the backfill injection material is performed from the ground at the rear earth retaining plate position behind the open shield machine, but depending on the construction conditions such as construction on narrow roads, visual confirmation at the rear earth retaining plate may be difficult. cases also arise.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an open shield machine that eliminates the inconveniences of the conventional example and allows a worker to move to the left and right of the open shield machine safely.

In order to achieve the above object, the invention according to claim 1 is provided with a propulsion jack disposed on a U-shaped fuselage having an open front surface and an upper surface, a front portion of the U-shaped fuselage being excavated, and a tail portion being suspended from above. At the rear end of the tail of the open shield machine, which was used as the box installation part of the concrete box to be lowered, an overhang stage made of a plate with the same width as the open shield machine was fixed to the tail beam of the open shield machine with bolts. The plate body constituting this overhanging stage is a rectangular metal plate, and a handrail is erected on the peripheral edge of the overhanging stage. The purpose of the rear earth retaining plate is to install it in a non-bonded state .

According to the first aspect of the present invention, by providing the overhanging stage, workers can easily move to the left and right of the open shield machine using this overhanging stage without making a large detour around the open shield machine. be able to.

For work in the front and rear of the open shield machine, there is no need to go around the front and rear of the open shield machine to reach the work position, which reduces work efficiency due to movement and reduces the risk of contact with heavy machinery, etc. In addition, workers can safely perform visual inspection and confirmation of the backfill injection material without visually inspecting and confirming the backfill injection material from the ground at the rear earth retaining plate position.

In addition, since it is a shaped plate, it can be installed on the rectangular U-shaped fuselage without discomfort even though it is installed at the rear end of the tail part of the open shield machine. can be arranged in By providing a handrail, it is possible to clearly indicate the direction of passage on the stage.

Furthermore, since it is a rectangular plate, if its long side is fixed, it can be made short so as not to protrude more than necessary, and the long side is fixed to the beam of the tail part of the open shield machine. Therefore, it can be stably provided in a cantilever manner.

In addition, since the overhang stage is installed in a state in which it is not connected to the rear earth retaining plate, the rear earth retaining plate is movably attached to the rear end of the tail part with a hinge, and the direction of the rear earth retaining plate corresponds to the curved excavation of the open shield machine. Even if the angle changes, the rear earth retaining plate is not hindered, and the overhang stage is not deformed.

According to the second aspect of the present invention, the gist of the projecting stage formed by a plate body is that a part or the whole of the stage is a mesh to form a see-through portion.

According to the second aspect of the present invention, it is possible to visually check and confirm the situation directly below the net-like portion of the overhang stage. For this reason, for example, when working on a road, there is no need to visually check the filling status of the backfill injection material at the rear earth retaining plate position, so there is no danger of contacting general vehicles passing by the open shield machine. , safe visual inspection and confirmation work can be performed.

As described above, the open shield machine of the present invention can be safely moved when a worker uses the extension stage to move to the left and right of the open shield machine. Since there is no need to go back and forth between the left and right sides of the machine, the wasted time spent going back and forth can be saved and the efficiency of the work can be improved.

In addition, since it is possible to reduce the situation of approaching the heavy machinery arranged in front of and behind the open shield machine, the risk of contact with the heavy machinery can also be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal side view which shows 1st Embodiment of the open shield machine of this invention. 1 is a cross-sectional plan view showing a first embodiment of an open shield machine of the present invention; FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; FIG. 2 is a cross-sectional view taken along line BB of FIG. 1; It is a top view which shows the time of curve construction. FIG. 5 is a plan view showing a second embodiment of the open shield machine of the present invention; FIG. 7 is a cross-sectional view taken along line AA of FIG. 6; It is a top view which shows the outline|summary of the open shield construction method using the open shield machine of this invention. It is a longitudinal side view showing the outline of the open shield construction method using the open shield machine of the present invention. It is a longitudinal side view of a conventional open shield machine. 1 is a cross-sectional plan view of a conventional open shield machine; FIG. FIG. 12 is a cross-sectional view taken along line AA of FIG. 11; FIG. 12 is a cross-sectional view taken along line BB of FIG. 11; It is a cross-sectional plan view which shows the outline|summary of the open shield construction method using the conventional open shield machine. It is a longitudinal side view which shows the outline of the open shield construction method using the conventional open shield machine. It is a perspective view of a concrete box.

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a vertical cross-sectional side view showing a first embodiment of the open shield machine of the present invention, FIG. 2 is a cross-sectional plan view of the same, and 1 in the figure is an open shield machine, as described above with reference to FIGS. 10 to 13. , The front part of the U-shaped fuselage is an excavation part, the rear part, the tail part is a box installation part of a concrete box that is hung from above, and the tip of the side wall plate 1a and the bottom plate 1b is formed as a cutting edge 11. In addition, propelling jacks 2 are arranged vertically in the center or near the rear end of the side wall plate 1a facing rearward. In the figure, 3 indicates a partition wall.

In this manner, the open shield machine 1 divides the U-shaped fuselage into a plurality of parts in the longitudinal direction, and the front end of the rear fuselage as the tail part is fitted into the rear end of the front fuselage as the front part. It is made bendable at the junction. The front part is mainly used for excavation, and the tail part is used to install a concrete box.

A rear retaining plate 17 is movably attached to the rear end of the tail portion 1c with a hinge.

In the figure, 17 is a rear earth retaining plate, which is movably attached to the rear end of the tail portion 1c with a hinge, as described in the following patent document, to prevent the earth from collapsing.

The rear earth retaining plates 17 are arranged in parallel in pairs at the left and right positions of the open shield machine 1, and the partition plates 16 are interposed orthogonally by hinge connection between them.

In the figure, 22 is a ladder for going up and down to the upper part of the concrete box, which is arranged beside the H-shaped steel beam 23 at the tail part of the open shield machine 1 .

In the present invention, an overhang stage 13 made of a plate having a width approximately equal to the width of the open shield machine is fixed at the rear end of the tail part 1c of the open shield machine 1 to the beam 23 of the tail part of the open shield machine 1 with bolts 24. It was set in a cantilevered state.

A plate constituting the overhanging stage 13 is a metal rectangular plate, and a handrail 25 is erected on the peripheral edge thereof. In this embodiment, the rectangular plate is a rectangular plate, and the long sides are fixed.

The handrails 25 are provided side by side along this long side, so that the overhanging stage 13 can be clearly defined as a passage between the parallel handrails 25 .

In addition, the overhang stage 13 is installed above the rear earth retaining plate 17 installed at the end of the tail portion in a non-bonded state with the rear earth retaining plate 17 .

Due to this non-coupling, when the open shield machine 1 is traveling along a curve, the rear earth retaining plate 17 changes direction along the curve as shown in FIG. Since it is only placed on the upper end of the plate 17, the open shield machine 1 can be smoothly propelled along the curve without being hindered by the rear earth retaining plate.

FIG. 6 shows a second embodiment of the present invention, in which the overhanging stage 13 is partly or wholly made of a mesh 14 to form a see-through portion.

The mesh 14 is formed by a grating made of expanded metal or other slatted steel plates. In the example shown in FIG. 6, a mesh member is used from both short sides of the overhanging stage 13 toward the center to the inside, and the central portion is made of a plate material. bottom.

By forming the net-like 14, when visually checking and confirming the filling state at the time of filling the back-filling injection material 6, as shown in FIG. It is possible to visually check and confirm the state of filling of the back-filling injection material on the top of both sides of 4.

Further, as shown in FIG. 8, the worker can move from the stage 13 installed in the open shield machine 1 to the left and right of the open shield machine.

Conventionally, the worker passes by the dump truck 15 and the excavator 9 from the position of the worker A19, passes by the open shield machine 1, and further passes by the backfilling heavy machine 18 and the dump truck 15. It was dangerous because it would go to the position of B20. In addition, especially in the case of laying the box 4 under the road, since general traffic vehicles run beside the open shield machine 1, etc., the movement of workers is more dangerous.

According to the present invention, the stage 13 of the open shield machine 1 can move back and forth between the left and right sides of the open shield machine, thereby improving the safety associated with the movement of workers.

DESCRIPTION OF SYMBOLS 1... Open shield machine 1a... Side wall plate 1b... Bottom plate 1c... Tail part 2... Promotion jack 3... Partition wall 4... Concrete box body 4a... Left side plate 4b... Right side plate 4c... Upper floor plate 4d... Lower floor plate 5... Backfill soil 6 ... backfill injection material 8 ... push angle 9 ... excavator 10 ... opening 11 ... cutting edge 13 ... stage 14 ... net 15 ... dump truck 16 ... partition plate 17 ... rear earth retaining plate 18 ... heavy machine for backfilling 19 ... worker A 20 …Worker B
21... Worker C 22... Ladder 23... Beam 24... Bolt 25... Handrail

Claims (2)

In an open shield machine, a propulsion jack is arranged on a U-shaped fuselage with an open front and top surface. At the rear end of the machine, an overhanging stage made of a plate whose width is about the same as the width of the open shield machine is fixed with bolts to the beam of the tail part of the open shield machine and provided in a cantilevered state. It is a rectangular plate made of metal, a handrail is erected on the periphery, and the overhang stage is installed above the rear earth retaining plate installed at the end of the tail part in a state of being unconnected with this rear earth retaining plate. shield machine. 2. The open shield machine according to claim 1, wherein the overhanging stage made of a plate is partially or wholly mesh-like to form a see-through portion.

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