JPH0521538Y2 - - Google Patents

Description

[Detailed explanation of the invention] "Industrial application field" This invention applies a propulsion reaction force to the backfill soil of a buried structure by expanding and contracting the propulsion jack that connects the front frame and the tail frame. This invention relates to a propulsion reaction force receiving structure for a self-propelled open shield aircraft that installs a buried structure inside the open shield aircraft while propelling the aircraft.

More specifically, the present invention relates to a structure for receiving the propulsion reaction force of an open shield machine when burying a box culvert as a buried structure using an open shield machine.

``Prior art'' Conventionally, when burying a box culvert using an open shield machine, the inner width of the tail frame of the open shield machine was made slightly larger than the outer width of the box culvert, and the back of the tail frame was The open shield machine was propelled by applying a propulsion reaction force to the backfill soil of the box culvert using the end and upper reaction plates. This backfilling soil was constructed in a mounded manner.

``Problems that the invention attempts to solve'' As a result, the following problems have arisen in the past.

(1) Because there is little clearance on the outside of the box culvert, backfilling of the outside area with soil will be insufficient.

(2) The propulsion reaction force is transferred from the rear end of the tail frame to the backfill soil on the outside of the box culvert, but because the clearance is small, stress transmission to the box culvert becomes sensitive, causing damage to the box culvert. give.

(3) If the outside width of the box culvert changes within one construction section, if the outside width of the box culvert becomes smaller than the width of the open shield machine,
The clearance increases. As a result, in order to prevent the backfill soil from collapsing into the open shield machine, it is necessary to take measures such as changing the width of the tail frame or stacking sandbags, etc.

"Means for Solving the Problems" This invention aims to eliminate the above-mentioned drawbacks, and its gist is as follows.

At the left and right rear ends of the tail frame of a self-propelled open shield aircraft, a flexible plate such as a rubber plate with a width larger than the clearance created between the tail frame and the box culvert is installed toward the inside of the tail frame. Install.

``Operation'' During propulsion of the open shield, the tail frame retreats and stress is generated in the backfill soil by the propulsion reaction force. This stress is absorbed by the flexible plate bending toward the tail frame.

Further, the clearance is closed with a flexible plate to prevent backfilling soil from collapsing into the tail frame.

"effect" The effects of this are listed below.

(1) Since the flexible plate prevents the backfill soil from collapsing into the tail frame, it is possible to provide enough clearance to fill the outside of the box culvert with backfill soil.

(2) If it is only to prevent backfill soil from collapsing, it is possible to install highly rigid steel plates;
Stress transmission to the box culvert during propulsion is not alleviated. Therefore, by using a flexible plate, stress can be absorbed and damage to the box culvert can be prevented.

(3) Furthermore, by using a flexible plate, it can sufficiently respond to changes in clearance, so even in construction areas where the outside width of the box culvert changes, one open car can be used without changing the inside width of the tail frame. Construction can be done using a shield machine.

``Example'' This invention will be described in detail below based on the illustrated example.

1 is the front frame of the open shield machine,
2 is a tail frame, and 3 is a propulsion jack.

Reference numeral 4 denotes a pair of left and right flexible plates, and although rubber plates are used in the embodiment, flexible plastic plates may also be used. As shown in Figure 4, 5
is a mounting member which is fixed in the vertical direction to the left and right rear end portions 2' of the tail frame 2, and the mounting surface 5' on which the flexible plate 4 is mounted is slightly inclined toward the inner rear of the tail frame 2. Nuts 6 are fixed to the mounting surface 5' at regular intervals in the vertical direction. The flexible plate 4 is mounted along this mounting surface 5',
The bolt 8 is screwed into the nut 6 via the presser plate 7 to be removably fixed.

Therefore, the flexible plate 4 is attached to the tail frame 2 in a state of being slightly inclined toward the inner rear of the tail frame 2.
They will be mounted opposite to each other on the left and right rear end portions 2' of the.

Here, the width of the flexible plate 4 is the width of the tail frame 2.
It is preferable that the clearance L generated between the box culvert 21 and the outer side of the box culvert 21 is approximately twice the expected maximum value. If the width of the flexible plate 4 is set to this size, the box culvert 2
In addition to being able to accommodate changes in the outer width of 1, when the propulsion jack is extended to propel the open shield machine as shown in Fig. 3, the stress in the side backfill soil 22 caused by the retreated tail frame 2 can be reduced. Then, the flexible plate 4 is able to curve toward the inside of the tail frame 2 with sufficient margin, and can absorb the stress of the backfilling soil 22 caused by the propulsion reaction force.

Furthermore, the reason why the mounting surface 5' of the mounting member 5 is sloped is that when the open shield aircraft is propelled as described above,
This is because the curved flexible plate 4 is difficult to come off, and the flexible plate 4 can be easily attached.

In addition, in the embodiment, the flexible plate 4 was attached to the rear end portion 2' of the tail frame 2 via the attachment member 5, but
It is also possible to attach it at right angles to the rear end 2', as shown in FIGS. 1 and 3.

In addition, 9 is a steel upper reaction plate, and bracket 1
0, it is removably attached to the upper part of the rear end part 2' of the tail frame 2, thereby taking a propulsive reaction force to the upper backfill soil.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view, FIG. 2 is a schematic rear view, and FIG. 3 is a plan view showing the curved state of the flexible plate during propulsion of the open shield aircraft. FIG. 4 is a partially cutaway plan view showing one embodiment in which a flexible plate is attached to the tail frame. 1...Front frame, 2...Tail frame, 2'...Rear end portion, 3...Propulsion jack, 4...
... Flexible plate, 21 ... Box culvert, 22
...Side backfill soil, L... Clearance.

Claims (1)

[Scope of utility model registration request] In an open shield machine that connects the front frame and tail frame with a propulsion jack and propels the machine by taking the propulsion reaction force into the backfilled soil of the buried structure, there are A propulsion reaction force receiving structure for an open shield aircraft, characterized in that a flexible plate having a width larger than the clearance generated between the tail frame and a box culvert is attached to the inside of the tail frame.