JPS603196Y2 - Earth removal device for shield excavator - Google Patents

Description

[Detailed description of the invention] The present invention relates to an earth removal device for a shield excavator.

For example, the well-known blind type shield excavator is said to lack adaptability to changes in soil quality during excavation.

Therefore, the use of this type of shield tunneling machine is limited by soil conditions.

The present invention has been made in view of the above, and embodiments thereof will be described below based on the drawings.

Reference numeral 1 denotes a shield of a blind type shield excavator, and 2 a partition wall. The partition wall 2 divides the inside of the shield 1 into a pressure chamber 3 facing a face and an atmospheric pressure chamber 4 behind the pressure chamber 3.

Reference numeral 5 denotes a movable hood, which is moved forward and backward by a jack 6 between a retracted position relative to the fixed hood part 7 and a protruding position in front of it.

Reference numeral 8 denotes a movable floor, which can be moved in and out of the partition wall 2 between the position shown by the imaginary line in the figure and the position shown by the solid line.

A cylindrical casing 9 is provided between the pressure chamber 3, the bottom and the atmospheric pressure chamber 4, penetrating the partition wall 2, and a screw 11 is installed in the main earth discharge passage 10 inside the casing 9, which extends over almost the entire length of the cylindrical casing 9. has been done.

The terminal end of the rotating shaft of the screw 11 is connected to a drive device 13 attached to the casing 9 via a cover 12.

The starting end of the main earth discharge passage 10 opens upward in the pressure chamber 3 to form a sand intake port 14, and the terminal end thereof forms a sand plug forming area 16 with a cone valve 15 disposed opposite to the opening.

Further, a branch passage 17 having a gate 18 is connected to the vicinity of the end of the main earth discharge passage 10, and a volumetric discharge device 19 is further connected to this branch passage 17.

Since the volumetric discharge device 19 itself is well known, its explanation will be omitted.

Note that 20 is a cylinder for opening and closing the gate, 21 is a drive device for the volumetric discharge device 19, and 22 is a mud removal pipe.

When excavated soil that does not have such fluidity is discharged to the atmospheric pressure chamber 4 side, the branch passage 17 is completely closed by the gate 18, the screw 11 is rotated in this state, and the cone valve 15 is operated. Sand plug (compacted excavated soil) S in sand plug formation area 16
The soil is continuously discharged through the main soil discharge passage 10 while forming the soil.

In addition, when discharging excavated soil with fluidity in the case of soft soil, the cone valve 15 is used to discharge the main soil discharge passage 10.
The terminal opening of the sludge is completely closed, and the branch passage 17 is opened by the gate 18, and sludge is continuously drained through the positive displacement discharge device 19 and the sludge draining pipe 22.

Therefore, regardless of soil conditions, the face holding pressure of the pressure chamber 3 can be maintained appropriately during continuous earth removal.

An opening 27 is formed in the upper part of the partition wall 2 .

A first auxiliary earth removal passage 28 extends horizontally into the opening 27, and a second auxiliary earth removal passage 28 which is widened toward the end near the end of the first auxiliary earth removal passage 28 and an intermediate part of the main earth removal passage 10 is formed in the opening 27. Earth removal path 2
9 for communication.

A screw 30 is disposed in the first sub-discharge passage 28, and a cone valve 32 forming a sand plug forming area 31 is disposed opposite the terminal end of the screw 30.

33 is a screw drive device.

Further, a gate 34 as an opening/closing device is provided at the end of the second sub-earth removal passage 29.

35 is a cylinder device for opening and closing the gate.

According to this, in the first sub-earth removal passage 28 as well as in the main earth removal passage 10, the cone valve 32 is adjusted depending on the soil quality.
It is possible to arbitrarily select mud removal from the side or mud removal via the second auxiliary earth removal passage 29.

Note that the partition wall 2 has one or more openings (not shown) in addition to the opening 27.

) are formed at appropriate positions.

That is, the number and formation positions of the openings and each of the sub-earth removal passages are appropriately determined according to the shield diameter and the like.

In the above, excavation is carried out while operating the shield jack for propulsion (not shown).

In this case, the earth and sand taken into the pressure chamber 3, that is, the hood part 7, is transferred from the earth and sand intake port 14 of the main earth removal passage 10 at the bottom of the pressure chamber 3 to the atmospheric pressure chamber 4 side, and For example, the soil is introduced into the first auxiliary soil discharge passage 2B through the opening 27 at the top of the partition wall 2, and is merged with the soil being transferred in the main soil discharge passage 10, and is discharged or removed to the atmospheric pressure chamber 4 side.

At this time, whether or not the earth and sand can be transferred through each opening and each of the auxiliary earth-unloading passages following them is controlled by individually opening or closing the gates installed in each of the auxiliary earth-unloading passages.

As is clear from the above explanation, according to the present invention, the amount of soil taken into the pressure chamber is adjusted from multiple positions on the partition wall through the main earth removal passage and the first sub earth removal passage. Earth or sludge can be removed.

Therefore, even if soil conditions change, uneven distribution of face holding pressure is unlikely to occur within the pressure chamber, and collapse of the ground can be effectively prevented.

In this case, by protruding the movable bed and controlling whether or not soil is allowed to be discharged from each soil discharge path, or by adjusting the amount of soil discharged separately, in addition to preventing the collapse of the ground, the excavation direction can be controlled.

In addition, a special mud removal device is required when the soil is soft, but since the first sub-soil removal path and the main dirt removal path are communicated via the second sub-soil removal path, It is only necessary to install the mud removal device in the main soil removal passage, which is economical.

Furthermore, since the second sub-earth removal passage is widened towards the end, clogging with earth and sand can be prevented.

In the above embodiments, a blind type shield tunneling machine has been described, but the present invention can be easily applied to other types of machines.

[Brief explanation of drawings]

The drawing is a longitudinal sectional side view of an embodiment of the present invention. 1... Shield, 2... Bulkhead, 3...
...Pressure chamber, 4...Atmospheric pressure chamber, 8...
...Movable floor, 10...Main earth removal passage, 11, 31
...Screw 27 ...Opening, 28
....First sub-earth removal passage, 29...Second sub-earth removal passage, 34...Gate (opening/closing device).

Claims (1)

[Scope of utility model registration request] In a shield excavator having a partition wall that partitions a pressure chamber facing a face and an atmospheric pressure chamber behind the pressure chamber, a main earth removal passage in which a screw is disposed between the pressure chamber and the atmospheric pressure chamber is provided, and the partition wall Moreover, an opening is formed at a position above the connection position of the main earth removal passage, and a first auxiliary earth removal passage in which a screw is arranged is connected to this opening, and the vicinity of the end of this first auxiliary earth removal passage and the main earth removal passage are connected to each other. A second auxiliary earth unloading passageway communicates with the middle part of the earthen passageway by a second auxiliary earth unloading passageway that widens toward the end, and an opening/closing device is provided in the second auxiliary earth unloading passageway, and a partition wall is provided between the connection point of the main earth unloading passageway and the opening. An earth removal device for a shield excavator, characterized in that a movable floor is provided so that it can be moved in and out of the pressure chamber.