JP3280201B2 - Gravel discharge method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for discharging gravel and the like,
For example, the present invention relates to a discharge method suitable for discharging gravel and the like from a caisson installed in water, taking out a load from a sunken ship, and the like.

[0002]

2. Description of the Related Art Conventionally, in order to return a caisson (submersible box) on a quay tilted due to an earthquake or the like to its original vertical standing state, the caisson is lifted using a large crane and then returned to its original vertical standing state. I was

[0003]

[Problems to be Solved by the Invention] However, rocks, stones, sand, soil, mud, etc. (in the present invention, called "gravels") are put in the caisson (submersible box), To lift with a crane, gravel must be discharged once and reduced. However, a great deal of labor is required to discharge such gravel from the caisson. Therefore, it is conceivable to inject water into the caisson and use a pump or the like to discharge gravel, etc. along with the water.However, rocks with a diameter of 20 cm to 30 cm are often mixed, and the impeller of the pump is damaged. And the method was impractical.

An object of the present invention is to provide a method for efficiently discharging gravel and the like from inside a caisson, regardless of the pipe diameter, and using a simple device.

[0005]

According to the method for discharging gravel and the like according to the present invention, a receiving tank having an upper opening is arranged on the sea side near an existing caisson, and water is injected into the caisson. A drop is formed between the water surface in the receiving tank and the water surface in the caisson so that the latter is at a high position, and the caisson and the receiving tank are communicated with a siphon pipe to remove gravel and the like in the caisson. The head is discharged by utilizing the head in a mixed state with the injected water, and only the water in the receiving tank is transferred by a transfer pump to deposit gravel and the like in the receiving tank.

[0006] Further, the surrounding wall is raised by projecting the upper end surface of the existing caisson in a protruding manner, a barge or a receiving tank is arranged on the sea side near the caisson, and water is injected into the caisson by a water supply pump. Therefore, a drop is formed between the water surface in the caisson and the water surface in the barge or the receiving tank so that the former is at a high position, and the caisson and the barge or the receiving tank communicate with each other through a siphon pipe to remove the gravel in the caisson. Utilizing the head in a mixed flow with the injected water, the head is discharged, and only the water in the barge or the receiving tank is transferred by a transfer pump to deposit gravel or the like in the barge. It is to let.

[0007] Further, the surrounding wall is raised by projecting the upper end surface of the existing caisson in a protruding manner, and water is injected into the caisson by a water supply pump, and the former is interposed between the water surface in the caisson and the sea surface. Forms a head at a high position, and by utilizing this head, gravel and the like in the caisson is discharged directly to the sea or a trench by a siphon pipe in a mixed flow with the injected water.

In addition, a receiving tank having an upper opening is disposed at a predetermined position of the dam, and a head is formed between the water surface of the dam and the water surface in the receiving tank such that the former is at a high position, and the head is utilized. Then, while discharging the gravel and the like of the dam to the receiving tank in a mixed state with the water by the siphon pipe, transferring only the water in the receiving tank by the transfer pump and depositing the gravel and the like in the receiving tank. It is.

In addition, a receiving tank having an upper opening is arranged in the sea, river, lake, swamp, etc., and the latter is located at a high position between the water surface in the receiving tank and the water surface of the sea, river, lake, swamp, etc. The head is used to discharge gravel from the sea, rivers, lakes, marshes, etc. in a siphon pipe using the head to the receiving tank in a mixed state with water, and only the water in the receiving tank is discharged. It is transferred by a transfer pump to deposit gravel and the like in the receiving tank.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 8 is a plan view showing an example of a caisson (submersible box) 1 used for a sea quay or the like. This caisson 1 is a kind of concrete block and has a substantially rectangular peripheral wall 2.
And a plurality of longitudinal partition walls 3 inside the peripheral wall 2.
… And width direction partition walls 4, and a bottom wall.

Thus, it is formed by the peripheral wall 2, the longitudinal partition wall 3, and the width partition wall 4, or
Gravel or the like is stored in a plurality of holes 5 formed by the longitudinal direction partition wall 3 and the width direction partition wall 4. Thus, this caisson 1 is used for landfill works such as rivers and ports.

Next, a method of discharging gravel and the like according to one embodiment of the present invention will be described.

FIG. 1 shows a caisson 1 tilted to the sea side due to the earthquake. In order to suspend the caisson 1 with a large crane and raise it vertically, the gravel or the like inside must be discharged once.

Therefore, as shown in FIG. 2, the receiving tank 6 having the upper opening 13 is transported by a ship or the like to the sea side near the caisson 1 as shown by the arrow A, and sunk in the direction of the arrow B at that position. Let it be placed.

Next, as shown in FIG. 3, seawater is injected into the caisson 1 from the sea by the siphon pipe 7 as shown by an arrow C. In addition, it is also preferable to inject seawater into the caisson 1 using a water supply pump (not shown).

Then, the caisson 1 and the receiving tank 6 are communicated by a siphon tube 8. Since higher by drop h ₁ the water surface of the water surface receiving tank 6 caisson 1, the tank 6 receives using the drop h ₁ gravel or the like in the caisson 1 in the sea water and mixed flow state of being injected into the caisson 1 Discharge to

Further, a transfer pump 9 is provided in the vicinity of the receiving tank 6, and only the seawater in the receiving tank 6 is transferred (discharged) by the transfer pump 9 as shown by an arrow E. Is deposited. In addition, it is also preferable to return the water in the receiving tank 6 to the caisson 1. In any case, the water in the receiving tank 6 is transferred outward.

If a large amount of gravel or the like accumulates in the receiving tank 6 during the operation, the receiving tank 6 is easily opened mechanically by another barge or the like because the upper part of the receiving tank 6 is largely open and on the sea surface. To gravel one after another. Alternatively, the receiving tank 6 itself may be pulled and moved by another ship.

Thereafter, if the gravel or the like in the caisson 1 is completely discharged, the caisson 1 rises, so it may be towed up or suspended vertically with a large crane.

4 to 6 show another embodiment of the present invention. First, as shown in FIG.
The peripheral wall 10 is piled up on the upper end surface of the slab in a projecting manner (consisting of concrete or the like). A sealant (material) is interposed all around the contact portion between the caisson 1 and the peripheral wall 10.

Thereafter, as shown in FIG. 5, the barge 11 is approached in the direction of arrow F, and the barge 11 is placed floating on the sea side near the caisson 1, and further, as shown in FIG. 1
Water is injected in the direction of arrow G by a water supply pump 12 attached to the vicinity of the caisson 1 so that the water surface in the caisson 1
The former between the water surface 11 forms a drop h ₂ as the high position.

Further, the caisson 1 and the barge 11 are connected to the siphon tube 8
Communicating at, gravel or the like in the caisson 1, in injected water mixed flow state using the above drop h _2, (as indicated by the arrow H) through a siphon tube 8 into the barge 11 to discharge .

Further, a transfer pump 9 is attached to the barge 11, and only water in the barge 11 is transferred or discharged or returned (to the caisson 1) in the direction of arrow I by the transfer pump 9, and
Gravel and other materials are discharged and deposited in 11.

When the inside of the barge 11 is full of gravel or the like,
By moving the barge 11 or another barge 11 from which gravel or the like has been removed to another location as shown by the arrow J and again placing it on the sea side near the receiving tank 6 as shown by the arrow K, However, the above method can be repeated. 4 to 6, the receiving tank 6 described with reference to FIGS. 2 to 3 may be used instead of the barge 11.

As yet another embodiment of the present invention, as shown in FIG. 7, a projecting (concrete, steel plate, or the like) lining is added to the upper end surface of the inclined caisson 1 to raise the surrounding wall 10. Next, water is injected into the caisson 1 as indicated by an arrow G by a water supply pump 12 provided in the vicinity of the caisson 1, and the former becomes a high position between the water surface in the caisson 1 and the sea surface. to form a drop h _3.

If the siphon tube 8 is disposed so that the discharge port of the siphon tube 8 is located at a position lower than the sea surface and the suction port of the siphon tube 8 is located in the caisson 1, using the drop h ₃ pulled in the direction of arrow L of water and mixed flow while being injected gravel as in the siphon tube 8, as indicated by the arrow M, is discharged directly into the sea. The gravel and the like discharged directly into the sea can be used for landfill, etc., and can also be dredged and reused.

FIG. 9 shows another embodiment of the present invention. FIG. 9 shows a main part of a dam on which gravel or the like has been deposited on the bottom surface. As shown in FIG. 10, the water of the dam is drained to lower the water level of the dam to some extent, and then the upper opening 13 is placed at a predetermined position of the dam.
Is transported by a large crane or the like, and is sunk as indicated by the arrow N direction. Alternatively, it is also desirable to install the tank 6 in advance at the time of dam construction or the like and to make it permanent.

Next, as shown in FIG. 11, the water surface of the dam,
The former between the water surface of the receiving tank 6 to form a drop h ₄ that a high position.

Then, the suction port of the siphon pipe 8 is arranged close to the dam sediment (gravel and the like), and the discharge port of the siphon pipe 8 is located on the bottom side of the tank 6. This head h ₄
By using the siphon pipe 8, the gravel or the like of the dam is lifted in a mixed state with the water as shown by the arrow P in the siphon pipe 8 and discharged into the receiving tank 6 as shown by the arrow Q.

Further, a transfer pump 9 is provided near the receiving tank 6.
Is attached, only water in the receiving tank 6 is transferred by the transfer pump 9 in the direction of arrow R, and gravel and the like are deposited in the receiving tank 6.

When the receiving tank 6 is full of gravel or the like, the gravel or the like may be once removed by an onboard shovel crane or the like.

Another embodiment of the present invention is shown in FIG.
See Figure 12. That is, as shown in FIG. 12, gravel and the like are deposited at the bottom of the sea, river, lake, swamp, etc., and as shown in FIG. The receiving tank 6 having the opening 13 is transported by a large crane or the like, and the arrow S
Sink and arrange as in the direction.

As shown in FIG. 14, and the water surface of the receiving only tank 6, the latter is to form a drop h ₅ serving as a high position between the water surface such as sea, rivers, lakes, marshes. The siphon tube 8 is arranged so that the suction port of the siphon tube 8 is located near the bottom of the sea, river, lake, marsh, etc., and the discharge port of the siphon tube 8 is located near the bottom of the receiving tank 6. Set up.

[0035] Therefore, by using the drop h _5, as shown by the arrow V direction in the siphon tube 8, a gravel such as sea, rivers, lakes, marshes and pulled up with water and mixed flow state, the direction of the arrow Y It is discharged into the receiving tank 6 as described above.

Further, a transfer pump 9 is provided near the receiving tank 6.
Is attached, only water in the receiving tank 6 is transferred by the transfer pump 9 in the direction of arrow X, and gravel and the like are deposited in the receiving tank 6.

If the receiving tank 6 becomes full of gravel or the like during the work, the gravel or the like is temporarily removed from the receiving tank 6 with a shovel crane or the like on a ship, and the above-described method is repeated many times. Can be.

In each of the above-described embodiments, the siphon pipe 8 is provided with a siphon generator such as a branch pipe or a switching valve and a vacuum pump for bleeding the internal air to generate a siphon flow. It also has a siphon release valve.

[0039]

Since the present invention is configured as described above, the following significant effects can be obtained.

According to the first aspect, since there is a drop h ₁ between the water surface in the receiving tank 6 and the water surface in the caisson 1, the large gravel in the caisson 1 is naturally generated by the siphon tube 8. Etc. can be discharged smoothly and efficiently in a mixed state with seawater. In particular, since no pump is used, there is no problem of damaging the impeller, and the siphon tube 8 simply needs to have a large diameter in accordance with the size (size) of the contained sediment (gravel). I'm done.

Therefore, the gravel and the like in the caisson 1 inclined due to the earthquake or the like can be quickly and smoothly discharged, and can be recovered in a short time by a large crane, and can be restored one after another in a short time.

According to the second aspect, the higher the height of the additional peripheral wall 10 protrudingly connected to the upper end surface of the caisson 1, the higher the height of the water surface in the caisson 1 and the higher the height of the barge 11. drop h ₂ which is formed on the surface of the water can be increasingly more reliably gravel or the like in the caisson 1 with water and mixed flow state at the siphon tube 8, and can be quickly discharged.

Even if the barge 11 is full of gravel or the like in the caisson 1 during the operation, the barge 11 can be easily moved to another place by attaching a rope or the like to the barge 11 and pulling it. This is convenient in that it can remove gravel and the like on the spot. When the receiving tank 6 is used, the same effects as those of the first aspect can be obtained.

[0044] (According to claim 3,) and the water surface in the caisson 1, so there is a drop h ₃ between the sea surface, naturally and easily gravel in the caisson 1 by siphon tube 8 Etc. can be discharged directly to the sea.

Since there is a head h ₄ between the water surface of the dam and the water surface of the receiving tank 6 (according to claim 4), the gravel of the dam is naturally and powerfully provided by the siphon pipe 8. Can be removed, and the amount of water stored in dams filled with gravel can be increased and restored.

[0046] (According to claim 5,) receiving the water surface in the tank 6, there is a drop h ₅ between the water surface such as sea, rivers, lakes, marshes, naturally in siphon tube 8, and It can efficiently dredge seas, rivers, lakes, marshes, etc. The equipment (equipment) is simple, no failures occur, and it can be said that it is actually an excellent dredging method.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention, in which a caisson is inclined.

FIG. 2 is a side view showing a state where a receiving tank is arranged near a tilted caisson.

FIG. 3 is a side view of a state where the siphon tube is discharging.

FIG. 4 is a side view showing another embodiment of the present invention and showing a state in which a projecting refilling peripheral wall is stacked on the upper end surface of the inclined caisson.

FIG. 5 is a side view showing a state in which a barge is arranged near a tilted caisson.

FIG. 6 is a side view showing a state in which the siphon tube is discharging.

FIG. 7 is a side view showing another embodiment of the present invention.

FIG. 8 is a plan view of an example of a caisson.

FIG. 9 is a side view showing still another embodiment of the present invention and showing a state in which gravel and the like are deposited on a dam.

FIG. 10 is a side view showing a state where a receiving tank is arranged on the dam.

FIG. 11 is a side view showing a state where the siphon tube is discharging.

FIG. 12 is a side view showing another embodiment of the present invention and showing a state where gravel and the like are accumulated in the sea.

FIG. 13 is a side view showing a state where a receiving tank is arranged in the sea.

FIG. 14 is a side view showing a state where the siphon tube is discharging.

[Explanation of symbols]

1 caisson 6 receiving tank 8 siphon tube 9 the transfer pump 10 topped peripheral wall 11 barge 12 water supply pump 13 upper opening h ₁ drop h ₂ drop h ₃ drop h ₄ drop h ₅ fall

Claims (5)

(57) [Claims] 1. A receiving tank 6 having an upper opening 13 is arranged on the sea side near an existing caisson 1, and water is injected into the caisson 1 so that the water surface in the receiving tank 6 and the caisson 1 Head h so that the latter is at a high position with the water surface inside
₁ is formed, the caisson 1 and the receiving tank 6 communicating with siphon tube 8, the gravel in the caisson 1, in injected the water and mixed flow state using the above drop h _1, and discharged ,
And a method for discharging gravel or the like, wherein only the water in the receiving tank 6 is transferred by the transfer pump 9 to deposit gravel or the like in the receiving tank 6. 2. A barge 11 or a receiving tank 6 is placed on the sea side near the caisson 1 by projecting the upper end of the existing caisson 1 in a protruding manner, and a barge 11 or a receiving tank 6 is provided. Into caisson 1 and the water surface in caisson 1 and barge 11
Or receiving the former between the water surface in the tank 6 to form a drop h ₂ as a high position, in communication with the caisson 1 and barge 11 or receiving tank 6 siphon tube 8, gravel within caisson 1 or the like and in injected the water and mixed flow state using the above drop h _2, discharged, and then transfer the water only該艀11 or receiving tank 6 at the transfer pump 9, the barge 11 A method of discharging gravel and the like, characterized by depositing gravel and the like on the ground. 3. The existing caisson 1 is protrudedly added to the upper end face thereof to protrude the surrounding wall 10 and water is injected into the caisson 1 by a water supply pump 12, and the water surface in the caisson 1 and the sea surface the former forms a drop h ₃ to a high position, by utilizing this drop h _3, a gravel or the like in the caisson 1 by siphon tube 8, with injected water and mixed flow state, direct sea between Or a method of discharging gravel or the like, which is discharged to a trench. 4. Place the receiving tank 6 having an upper opening 13 in a predetermined position of the dam, to form the water surface of the dam, the drop h ₄ of the former between the water surface of the receiving tank 6 is high position ,
Using this drop h _4, the dam gravel while discharged into the receiving tank 6 with water and mixed flow state, transferring only the water receiving only tank 6 at transfer pump 9 at siphon tube 8, A method for discharging gravel or the like, wherein gravel or the like is deposited in the receiving tank 6. 5. A receiving tank 6 having an upper opening 13 at a sea, a river, a lake, a marsh, etc.,
Gravel latter forms a drop h ₅ serving as a high position, such as sea, rivers, lakes, marshes in siphon tube 8 by utilizing this drop h ₅ between the water surface such as sea, rivers, lakes, marshes Or the like, characterized in that only the water in the receiving tank 6 is transferred by the transfer pump 9 to deposit gravel and the like in the receiving tank 6 while discharging the mixed water and the like to the receiving tank 6. Discharge method.