JPH10195883A - Water muddying preventive mud removing construction method and water muddying preventing steel frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure work space in the water by removing mud deposited on the bottom of water without a problem of water contamination by use of a structure which is good for work execution and can be easily removed after the completion of works in the case of constructing a bridge pier. SOLUTION: Corrugated sheets 17 with a radius enough for ensuring the work space in the water are connected to each other in the horizontal circumferential direction and in the vertical direction to assemble a corrugated pipe 18, and a knife edge member 19 made by a steel plate is fixed to the lower end of the corrugated pipe 18 to construct a water mudiness preventing steel frame. The steel frame is set in the mud 14 at the bottom of the water, thereby removing mud in the range surrounded with the steel frame. This setting of the steel frame and removal of mud 14 are performed until reaching the top of the foundation 13. In the case of ensuring the work space 1 in the water in the periphery for reinforcing the existing underwater bridge pier 11, the corrugated pipes 18 are assembled in such a manner as to surround the underwater bridge pier 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention accumulates on a water floor around a pier or the like to secure a work space underwater when a pier is constructed underwater or when an existing underwater pier is reinforced. The present invention relates to a method for removing muddy soil for removing a large amount of muddy soil and a steel frame for preventing muddy water used for the method.

[0002]

2. Description of the Related Art In the case of constructing a pier underwater, for example, in order to enable the construction work, an appropriate area surrounding a construction site is subjected to a deadline work, and water is drained from the inside to make a work space. Secure. And in this kind of deadline method,
Generally, a deadline method of driving a steel sheet pile is employed. The deadline method using steel sheet piles has good workability,
Driving is impossible on rock or hard ground, and there is a problem of noise and vibration caused by driving in urban areas. In addition, in the case of reinforcement work of an existing pier instead of new construction of a pier,
Since a bridge girder already exists, it is not always possible to secure the upper space required for driving steel sheet piles, and it may not be possible to adopt it. In addition, piers and the like are often constructed in cities and suburban areas where the flow of water is relatively gentle, and a large amount of mud is usually deposited on the bottom of the water that should be used as a foundation. Water pollution and the resulting compensation for fisheries become important issues.

Japanese Utility Model Publication No. 57-23553 discloses a temporary closing structure which can be constructed even when the ground is hard or noise and vibration must be avoided. As shown in FIG. 8, an inner cylinder A made of a liner plate and an outer cylinder B made of a corrugated pipe pre-assembled on land are installed around a structure E such as a pier on a base G, A filling material C such as earth and sand is charged and filled between the cylindrical body A and the outer cylindrical body B, and concrete or the like is cast on the ground G outside the base B ′ of the outer cylindrical body B to perform the solidification D. The working space can be secured around the structure E by draining the water inside the inner cylindrical body A.

[0004]

Since the above-mentioned conventional structure does not use steel sheet piles, it does not cause a problem of an upper space necessary for driving the steel sheet piles, a problem of hard ground, a problem of noise and vibration, and the like. However, the construction work is extremely complicated due to the necessity of installing a double cylinder and the need to charge and fill the filling material C. In addition, this structure is a temporary deadline structure and must be removed after the construction is completed, but it is easier to remove than steel sheet piles because there are no driving parts, but the removal work is still complicated It is. A large amount of mud accumulated on the bottom of the water should be removed before construction of the above structure so as not to cause water pollution. There is no description.

Accordingly, the present invention solves the above-mentioned conventional drawbacks, and uses a structure that is easy to remove after construction is completed without using steel sheet piles, and removes mud accumulated on the water bottom with water quality. It is possible to secure a work space underwater by removing the problem without causing a problem of contamination.

[0006]

According to the present invention, there is provided a method for removing muddy water, which comprises connecting a corrugated sheet having a radius sufficient to secure an underwater working space in a horizontal circumferential direction and a vertical direction. A steel plate cutting edge member is fixed to the lower end of the corrugated pipe to form a steel frame for preventing water turbidity.The steel frame is embedded in mud at the bottom of the water, and the steel frame is used. A method for removing mud in which water is prevented by removing mud in an enclosed area and performing rooting of the steel frame and removal of mud until the steel frame reaches an upper surface of a foundation. The work of constructing the steel frame may be performed on a barge floating on the water surface. Also, if it is not possible to secure a sufficient space for forming the steel frame at the top, after the steel frame is inserted, a new corrugated sheet is connected to the upper end of the corrugated pipe and the corrugated pipe is moved upward. By extending the length, it is effective to alternately insert the steel frame and extend the corrugated pipe upward. And when a structure already exists, such as reinforcement work for an existing underwater pier, it is possible to assemble a corrugated pipe surrounding the existing structure and secure a working space in the water around the structure. is there.

The steel frame for preventing water turbidity according to the present invention comprises a corrugated sheet having a radius sufficient to secure an underwater working space connected in a horizontal circumferential direction and a vertical direction to assemble a corrugated pipe. A steel frame for preventing water turbidity, wherein a steel plate cutting edge member is fixed to a lower end of a pipe.

[0008]

FIG. 1 shows an embodiment of a steel frame for preventing water turbidity according to the present invention. FIG. 3 shows a state in which the steel frame for preventing water pollution has reached the upper surface of the foundation 13 by the method for removing water pollution prevention mud according to the present invention.

The steel frame for preventing water turbidity of the present invention is shown in FIG.
The corrugated sheet 17 having a radius sufficient to secure the underwater working space 1 is connected in the horizontal circumferential direction and the vertical direction as shown in FIG. A steel plate cutting edge member 19 is fixedly provided at the lower end of the corrugated pipe 18. Reinforcing members 20 are appropriately arranged inside the corrugated pipe 18 to reinforce the strength as required.

FIG. 2 shows details of an example of a cutting edge member 19 at the lower end of the corrugated pipe 18. In this example, the cutting edge member 19 made of a steel plate is fixed from the outside of the lower end portion of the corrugated pipe 18 by overlapping and tightening with the bolt 21, but the present invention is not limited to this. For example, the cutting edge member 19 may be overlapped from the inside, may be added to the tip of the lower end by abutting, or may be fixed by welding or the like in addition to bolts. In this example, the tip of the lower end of the reinforcing member 20 is cut diagonally so as to reduce the resistance at the time of embedding in mud.

Next, the method for removing muddy water of the present invention is described below.
An example in which a work space is secured in the water around the underwater pier to reinforce the existing underwater pier will be described.

3 to 7 show an embodiment of the method for removing muddy soil according to the present invention. This is the bridge girder 1 on the foundation 13
2 shows an example in which the existing bridge pier 11 supporting the bridge 2 is reinforced, and a large amount of mud 14 is deposited on the underwater foundation 13. For reinforcement of the pier 11, for example, a steel plate having a thickness of about 10mm is wound up with a gap of about 30mm between the pier 11 and the outer peripheral surface of the pier 11, and the mortar or the adhesive is filled into the gap. The concrete is further rolled up to a thickness of less than 500 mm.

First, as shown in FIG. 3, the barge 15 is floated adjacent to the pier 11 so as to surround the pier 11, and is used as a work platform. On this barge 15, a plurality of arc-shaped corrugated sheets 17 are connected in a horizontal circumferential direction so as to surround the pier 11, and a one-stage corrugated pipe 18 a is assembled.

Next, as shown in FIG. 4, the one-stage corrugated pipe 18a is connected to a wire 1 by a crane (not shown) or the like.
6, and a plurality of arc-shaped corrugated sheets 17 are connected below the corrugated sheet 17 in a horizontal circumferential direction so as to surround the pier 11.
Assemble. Then, the first one-stage corrugated pipe 18a is lowered, and the lower one-stage corrugated pipe 18a is lowered.
The upper corrugated pipes 18a and 18b are connected to each other by bolts.

By repeating the above operation, as shown in FIG. 5, the corrugated pipe 18 composed of five corrugated pipes 18a to 18e is assembled around the pier 11. Then, as illustrated in detail in FIG. 2, a steel plate edge member 19 is fixed to the lower end of the corrugated pipe 18 to form a water spill prevention steel frame.

After the steel frame is constructed as described above, as shown in FIG. 6, the barge 15 is moved away from the pier 11 so that the corrugated pipe 18 is moved. In the mud 14 and remove the mud in the area surrounded by the steel frame.

The amount of the steel frame to be inserted into the mud may be determined appropriately according to the conditions. If the mud is soft and the pile thickness is small, it may be possible to reach the upper surface of the foundation 13 with one embedding, or it may be necessary to perform embedding and mud removal several times. Performing the embedding of the steel frame and removal of the mud until reaching the upper surface of the foundation includes one case and a plurality of cases.

The method for removing mud is not particularly limited. It may be scooped out with a shovel, or may be vacuum-suctioned with a hose. In any case, since the mud in the area surrounded by the steel frame is removed, there is no problem that the mud outside the steel frame is stirred to cause water pollution.

In the case where the corrugated pipe 18 having a sufficient height cannot be initially assembled because the bridge girder and the like are present at the upper part and a sufficient space cannot be secured above the barge 15, FIG.
After the steel frame is lowered into the mud 14 as shown in (1), a corrugated sheet is newly connected to the upper end of the corrugated pipe 18 to extend the corrugated pipe 18 upward, and then the steel frame is re-formed. You only have to do rooting.

As described above, when the steel frame reaches the upper surface of the foundation 13 as shown in FIG. 7 as a result of embedding the steel frame and removing the mud, the method for removing muddy water according to the present invention is carried out. Complete. After that, if necessary according to the construction method, water is stopped between the lower end of the steel frame and the upper surface of the foundation 13 to drain the water, and the work space is secured under the water by surrounding the pier 11.
Then, the necessary reinforcement work of the pier 11 may be performed in this work space. After the completion of the reinforcement work, the corrugated pipe 18 can be disassembled into the corrugated sheets 17 by removing the bolts, so that the removal work is easy.

The above description has been made with respect to an example in which an existing underwater pier is reinforced. However, the present invention is not limited to this. It can be widely used when it is necessary to secure a working space in the muddy water.

[0022]

According to the present invention, without using steel sheet piles, using a structure with good workability and easy to remove after the construction is completed, the mud accumulated on the bottom of the water can be removed without causing the problem of water pollution. It becomes possible to secure a work space in the water by removing it.

[Brief description of the drawings]

FIG. 1 is a plan view (FIG. 1 (a)) and a side view (FIG. 1 (b)) showing an embodiment of a steel frame for preventing water turbidity of the present invention.

FIG. 2 is a view showing details of an example of a cutting edge member at a lower end portion of a corrugated pipe of a steel frame for preventing water turbidity according to the present invention.

FIG. 3 is a diagram showing a first stage of an embodiment of a method for removing muddy soil according to the present invention.

FIG. 4 shows an embodiment of a method for removing muddy soil according to the present invention.
FIG.

FIG. 5 is a diagram showing an embodiment of a method for removing muddy water according to the present invention.
FIG.

FIG. 6 is a diagram showing an embodiment of a method for removing muddy water according to the present invention.
FIG.

FIG. 7 is a diagram showing an embodiment of a method for removing muddy water according to the present invention.
It is a figure which shows the stage following, and has shown the state which the steel frame reached | attained the foundation upper surface, and the water pollution prevention mud removal method of this invention was completed.

FIG. 8 is a view showing a conventional deadline structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Working space 10 Water surface 11 Bridge pier 12 Bridge girder 13 Foundation 14 Mud 15 Barge 16 Wire 17 Corrugated sheet 18 Corrugated pipe 18a, 18b, 18c, 18d, 18e One-stage corrugated pipe 19 Cutting edge member 20 Reinforcement member 21 Bolt

Claims (5)

[Claims] 1. A corrugated pipe having a radius sufficient to secure an underwater working space is connected in a horizontal circumferential direction and a vertical direction to assemble a corrugated pipe, and a steel plate cutting edge member is provided at a lower end portion of the corrugated pipe. Is fixed to form a steel frame for preventing water turbidity, the steel frame is embedded in mud at the bottom of the water to remove mud in a range surrounded by the steel frame, A method for removing muddy water that prevents embankment and removal of mud until it reaches the upper surface of the foundation. 2. The method according to claim 1, wherein the construction of the steel frame is performed on a barge floating on the water surface. 3. The method according to claim 1, further comprising connecting a new corrugated sheet to an upper end of the corrugated pipe and extending the corrugated pipe upward after the steel frame is inserted.
Or the method for removing muddy soil according to 2 above. 4. The method for removing muddy water according to claim 1, wherein a corrugated pipe is assembled around the existing structure to secure a working space in the water around the existing structure. 5. A corrugated pipe having a radius sufficient to secure an underwater working space is connected in a horizontal circumferential direction and a vertical direction to assemble a corrugated pipe, and a steel plate cutting edge member is provided at a lower end of the corrugated pipe. A steel frame for preventing water turbidity, wherein the steel frame is fixed.