JPH11323872A - Remodeling method of sheet pile type quay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a tie rod and conduct remodeling construction works in the remodeling construction works of a sheet pile type quaywall under the state, in which a sheet-pile wall and brace works are connected by the tie rod. SOLUTION: A caisson body 5 is moved on water and arranged in front of the sheet pile type quaywall. Piles 8 are driven to the bottom of water from the caisson body 5 while water is poured into the caisson body 5 and the caisson body 5 is sunk. The sheet-like wall 2 of the sheet pile type quaywall is pushed backwards by hydraulic jacks 7 installed onto the side face of the caisson body 5, and the existing steel-pipe sheet piles 4 of the sheet-pile wall 2 are supported. Accordingly, since the existing steel-pipe sheet piles 4 are brought to the state, in which they are supported by the caisson body 5, tie rods 3 bearing the existing steel-pipe sheet piles 4 can be removed. A ground at the rear of the existing steel-pipe sheet piles 4 is improved under the state, in which the tie rods 3 are taken off, but soil can be improved easily and surely because there is no tie rod 3 at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for remodeling a sheet pile type quay for retrofitting an existing sheet pile type quay.

[0002]

2. Description of the Related Art In general, a sheet pile type quay (sheet pile type mooring pier) is known which is used as a retaining wall by driving a sheet pile. On the sheet pile type mooring shore, there are a self-supporting sheet pile type, a slanting pile pile sheet pile type, a sheet pile type having a front oblique support pile, a double sheet pile type, a shelf type (when the shelf type is also included in the sheet pile type), and the like. However, in a normal sheet pile type mooring pier (sheet pile retaining type quay), a retaining work is formed behind the sheet pile to be the wall of the quay, and the sheet pile and the retaining work are tied with tie materials (tie rods, tie wires, etc.). Connected. In the sheet pile type mooring berth, a large number of tie materials are arranged in parallel at intervals. And
The sheet pile type quay has a structure in which earth pressure on the back of the sheet pile is supported by the staying work and the passive earth pressure on the front of the root of the sheet pile. When improving the ground behind a sheet pile in such a sheet pile type quay for liquefaction countermeasures, it is necessary to remove the tie material that supports the sheet pile against the earth pressure on the back. Because it is not possible, from between Thai materials,
Ground improvement such as rod compaction was being performed.

[0003]

However, if the ground behind the sheet pile type quay is improved in the state where the tie is present as described above, the ground cannot be improved in the portion where the tie is present, and the ground is not improved. Since the location to be improved depends on the position of the tie material, the ground improvement could not be performed at a predetermined pitch. Therefore, there is a possibility that the improvement cannot be performed until the ground has the desired strength.

[0004] Also, in places where the mounting interval of the tie is narrow,
In some cases, there was not enough space between the tie materials to perform the ground improvement, and it was not possible to perform the ground improvement in places where the tie materials were densely arranged. In addition, when the ground improvement was performed near the sheet pile and the tie material, there was a possibility that the sheet pile would be displaced horizontally.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of remodeling a sheet pile type quay which can easily and surely be modified behind an existing sheet pile type quay. And

[0006]

According to a first aspect of the present invention, there is provided a method for remodeling a sheet pile type quay, comprising the steps of:
The back of the sheet pile is remodeled, and a box that can float and sink by draining and pouring water and that can move on the water in a floating state is moved in front of the existing sheet pile type quay and sinks, preparing for the above box In order to solve the above-mentioned problem, the rear part of the sheet pile is modified while the front face side of the sheet pile of the sheet pile type quay is pressed by the given pressing means.

According to the above construction, the box body in a state of being poured and sunk is pressed by the pressing means against the front surface of the sheet pile of the sheet pile type quay, so that the box body opposes the earth pressure on the rear face and pushes the sheet pile. It will be in the state of being supported. Therefore, even if the remodeling is performed behind the sheet pile type quay, the sheet pile can be supported by the box during the remodeling. And the horizontal displacement of the sheet pile during the remodeling can be prevented. In addition, when the sheet pile type quay uses the stay, the sheet pile is supported by the box,
It becomes possible to remove the timber connecting the sheet pile and the stay,
By removing the timber, the retrofit can be done behind the sheet pile quay without being disturbed by the timber.

According to a second aspect of the present invention, there is provided a method for remodeling a sheet pile type quay, wherein the box is provided with a pile driving means for driving a pile into a water bottom, and when the front face of the sheet pile is pressed by the pressing means, The means for solving the above problem is that the pile is driven into the water bottom by the pile driving means so that the box is supported on the water bottom by the pile.

According to the above configuration, since the box is supported by the pile driven into the water bottom, the box can be supported by the box even when a large force is applied to push the sheet pile forward. In other words, when the box is simply submerged in the water bottom, the box is pressed against the sheet pile by its weight and the frictional force generated against the water bottom, so if the box is light, the sheet pile should be sufficiently supported. However, if the box is fixed to the bottom of the water with a pile, the sheet pile can be reliably supported. Furthermore, by using a pile as described above, the weight of the box can be reduced, and the bottom of the box does not need to be made of a shape or a material that causes large friction with the water bottom. The cost of the body can be reduced.

According to a third aspect of the present invention, in the method of modifying a sheet pile type quay, the sheet pile type quay is formed by connecting a sheet pile to be a quay and a retaining work provided behind the sheet pile with a tie. After pressing the front surface of the sheet pile with the pressing means of the box, the tie material is removed from the sheet pile, and then the back of the sheet pile is modified to solve the above problem.

[0011] According to the above configuration, after the sheet pile is supported by the box, the tie material connecting the sheet pile and the stay is removed, and then the back of the sheet pile is remodeled. Can be easily modified behind the sheet pile without being disturbed. In addition, the remodeling can be performed more reliably than when remodeling is performed in the presence of the tie material.

[0012] In the method of remodeling a sheet pile type quay according to claim 4 of the present invention, as the remodeling, improving the ground behind the sheet pile is a means for solving the problem. According to the above configuration, even if the ground improvement is performed behind the sheet pile, the sheet pile is supported by the box, so that horizontal displacement of the sheet pile can be prevented. In particular, in the case of a sheet pile type quay with a retaining work, the ground improvement can be performed with the tie material removed, so that the ground improvement can be performed reliably, easily, and evenly without being disturbed by the tie material. It becomes possible. Also,
Machines such as various heavy machines can be arranged behind the sheet pile without being disturbed by the timber, so that the ground improvement can be performed by various ground improvement methods without limiting the ground improvement method.

According to a fifth aspect of the present invention, there is provided a method of remodeling a sheet pile type quay, wherein the remodeling includes driving a new pile near the sheet pile behind the existing sheet pile and deeper than the sheet pile. The solution. According to the above configuration, since the front surface of the existing sheet pile is pressed by the box, even if a new pile (sheet pile) is driven close to the rear side of the sheet pile, the existing sheet pile can be prevented from being displaced. . Also, in the sheet pile type quay using the staying work, it is not possible to continuously drive new piles behind the sheet pile because it is disturbed by the Thai material, but the existing sheet pile is supported by the box and the Thai material is removed. This allows the pile to be driven continuously behind the existing sheet pile.

By driving the pile deeper than the existing sheet pile behind the existing sheet pile, the depth of the pile (sheet pile) is deeper, so that the water depth can be made deeper on the front side of the sheet pile. After the renovation of the sheet pile type quay has been completed, work to increase the water depth can be performed so that larger ships can be moored.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a method of remodeling a sheet pile type quay according to an embodiment of the present invention.
FIG. 1 shows a cross section of a sheet pile type quay in a state where the improvement has been substantially completed. The sheet pile type quay remodeled in this example is a normal type using a stay 1 and includes a sheet pile 2 forming a quay and a stay 1 provided behind the same, and the sheet pile 2 and the stay 1 are provided. Work 1 is connected with tie material 3 (tie rod, tie wire).

In this example, the sheet pile wall 2 is made of a steel sheet pile (an existing steel sheet pile 4) provided with a joint on a steel pipe. As sheet piles, there are steel, reinforced concrete, prestressed concrete, and the like, and as sheet piles, there are U-shaped, Z-shaped, box-shaped, and steel pipes. However, reinforced concrete sheet piles and prestressed sheet piles are rarely used on large mooring berths.

The stay 1 is composed of two slanted piles (indented pile 1a and drawn pile 1b). In addition, as the staying work, there are those using straight piles instead of slant piles, those using cast-in-place concrete walls, precast concrete walls, sheet pile walls, etc., and the present invention is applied to those using these. It is possible. The tie material 3 is
It is made of high-strength steel, and is arranged in parallel so as to connect the stay 1 and the existing steel sheet pile 4.

An existing backing sandstone A is backed on the back of the sheet pile wall 2. Some sheet pile type quays do not use the stay 1 and the present invention using the box 5 described later can be applied to these sheet pile quays. When the present invention is applied to a sheet pile type quay using the tie material 3, particularly excellent effects as described later can be obtained.

In this example of the method of remodeling a sheet pile type quay, first, a box body 5 is disposed in front of a place where the sheet pile type quay is to be remodeled, that is, on the sea side. The box 5
Has a closed cavity inside and can move on the water in a floating state, but the inside cavity functions as a ballast tank, and a pump (not shown) for the inside cavity Allows water injection and drainage. That is, the box 5 is basically a pontoon into which water can be injected and drained.

The box 5 can be sunk to the bottom by pouring water into the box. In addition, it is possible to re-emerge by draining the water in the cavity of the box 5 under the water bottom. Also,
The box 5 includes a deck 6 provided at an upper portion and a plurality of hydraulic jacks (pressing means) provided at least on one side.
7 and a pile driving device (not shown) for driving the piles 8 and 8 into the water bottom
And are provided. The deck 6 is formed on a frame 9 assembled on the box 5 so that the box 6 is immersed in water and comes out on the water.

The height of the deck 6 supported by the frame 9 is preferably substantially the same as the upper surface of the sheet pile type quay when the box 5 is sunk. And Deck 6
Can be used as a work floor. Therefore, when performing ground improvement or the like behind the sheet pile quay as described below, even in a narrow place where there is not enough working space near the part where the ground improvement is being performed,
Since the deck 6 of the box 5 can be used as a work space, the sheet pile type quay can be remodeled even in the above-mentioned narrow place.

The hydraulic jacks 7 press the existing steel pipe sheet pile 4 of the sheet pile type quay rearward from the box 5 sunk close to the front of the sheet pile type quay, as described later, to reduce the earth pressure on the back. It supports the existing steel pipe sheet pile 4 in the pushed state.
The tie material 3 can be removed from the existing steel pipe sheet pile 4 by pressing the front face of the existing steel pipe sheet pile 4 with the hydraulic jacks 7 to support the existing steel pipe sheet pile 4 pressed by the back earth pressure. Become. Although well-known hydraulic jacks 7 can be used, it is preferable to use a waterproof jack.

The pile driving device is a press-fitting device for press-fitting the pile 8, and the pile 8 is disposed at each of the four corners of the box 5 so as to penetrate the box 5 up and down. The pile 8 is vertically movable with respect to the box 5.

The pile driving device is, for example, a pile 8
, A guide portion (not shown) for guiding the holding portion up and down, and a hydraulic cylinder (not shown) for driving the holding portion up and down. By repeatedly lifting the pile 8 upward with the hydraulic cylinder in the separated state, and then lowering the gripping section downward with the hydraulic cylinder while holding the pile 8 with the gripping section,
Can be pressed into the lower water bottom, and the box 5 can be fixed to the pile 8 by sandwiching the pile 8.

In the pile driving device, the pile 8 can be pulled out from the water bottom by operating in the reverse of the above-described operation. Further, the pile driving device is not limited to the one described above, and may be any device as long as the pile 8 can be driven from the box 5 to the water bottom. Also,
When fixing the pile 8 to the box 5, for example,
The members on the side may be fastened. Further, as the pile 8, various piles made of steel pipe, H-shaped steel, precast concrete, or the like can be used.

Such a box 5 can be relatively easily constructed, for example, by modifying a tanker or the like. In other words, there are tanks inside the tanker that allow water injection and drainage, so it is not necessary to make many modifications to the hull itself, and the hull is slightly modified,
By equipping the frame 9 and the deck 6, the hydraulic jack 7, the pile driving device, the pile 8, and the like, the box 5 of the present invention can be obtained. In addition, if the box 5 is fixed to the water bottom by the pile 8 as described above, the shape of the bottom of the box 5 is not strictly limited. Is possible. In addition, a dedicated pontoon may be prepared as the box 5 and the above-mentioned device may be equipped therewith, or various vessels other than tankers, for example, work vessels, floating docks and the like may be improved. good.

When the box 5 is placed in front of the sheet pile type quay as described above, the box 5 is moved while floating.
The side of the box 5 on which the hydraulic jacks 7 are attached is brought close to the sheet pile type quay, and the box 5
Water is injected into the inside and the box is submerged. Further, before or after submerging the box 5, the pile 8 is pressed into the water bottom by a pile driving device. If the box 5 is sunk first after the stake 8 is driven in, the box 5 can be sunk in a stable state along the stake 8.

After the housing 5 is sunk, the pistons of the hydraulic jacks 7 are extended so that the pistons are brought into contact with the existing steel sheet pile 4 to support the existing steel sheet pile 4. In this state, since the existing steel pipe sheet pile 4 is supported by the box 5, the tie member 3 supporting the existing steel pipe sheet pile 4 can be removed.

Since the buoyancy acts on the box 5 submerged in the water, unless the weight of the original box 5 is large, the box 5 has a large support when supporting the existing steel pipe sheet pile 4. Although the force cannot be obtained, as described above, the weight of the box 5 is reduced by driving the piles 8, 8 into the water bottom and fixing the box 5 to the water bottom via the piles 8, 8. In both cases, a sufficient supporting force can be obtained.

After the existing steel pipe sheet pile 4 is supported by the box 5, the pavement on the upper surface of the sheet pile type quay from the existing steel pipe sheet pile 4 to the rear of the stay 1 is peeled off, and the pavement is peeled off as described above. In addition, the area shown by the broken line C is excavated. That is, the tie material 3 connecting the existing steel pipe sheet pile 4 and the stay 1 is dug out. Then, the tie material 3 is removed from the existing steel pipe sheet pile 4 and the stay 1. Next, remodeling behind the sheet pile type quay will be performed. Here, the ground improvement behind the sheet pile type quay and the driving of new piles will be mainly performed.

The main purpose of the ground improvement is a countermeasure against liquefaction, and it is preferable to use a ground improvement method suitable for the countermeasure against liquefaction. Well-known methods can be used for ground improvement, for example, replacement method, sand mat method, sheet net method, embankment embankment method, sand drain method, bagged sand drain method, board drain method, gravel drain Construction method, preloading method, well point method, deep well method, atmospheric pressure method,
Trench method, lime pile method, sandwich method,
Sand compaction pile method. Vibro flotation method, rod compaction method, vibro tamper method, dynamic consolidation method, reinforcing earth method, chemical liquid injection method, mixing processing method, injection stirring method, electrochemical consolidation method, and methods that improved these methods, Other construction methods and the like can be used.

Further, for example, different construction methods may be used depending on the location (for example, the vicinity of the sheet pile and the part farther from the vicinity of the sheet pile) or the depth, and a plurality of soil improvement methods may be used in combination, A ground improvement method combining the improvement methods may be used, and the ground improvement method is not particularly limited. The range of the ground improvement performed here is, for example, the ground indicated by oblique lines in the figure between the existing backing sandstone A behind the existing steel pipe sheet pile 4 and the backing 1.

In the above ground improvement, the tie material 3 is removed and the construction is performed, so that the construction is not hindered by the tie material 3. That is, when there is the tie material 3, depending on the arrangement of the tie material 3, there is a case where the construction pitch cannot be performed at a constant interval or the tie material 3 cannot be constructed in a densely arranged place. By removing the tie material 3, such a problem can be prevented from occurring.

In order to prevent the outflow of earth and sand, a double pipe double backer may be used to inject a chemical solution into a region shown by D in the figure of the root portion of the existing steel pipe sheet pile 4. However, this is performed depending on the situation, and need not be performed. Further, in this example, a new steel pipe pile 10 longer than the existing steel pipe sheet pile 4 is driven immediately behind the existing steel pipe sheet pile 4. This is because, in order to cope with an increase in the size of a ship that can be moored in the future, the current water bottom (dashed line in the figure) indicated by reference numeral L1 is excavated, and the water bottom at the planned depth indicated by reference numeral L2 ( In carrying out the construction with (solid line)
This is performed to reinforce the existing steel pipe sheet pile 4.

That is, when the water depth is increased at the water bottom in front of the existing steel pipe sheet pile 4, the length of the existing steel pipe sheet pile 4 is shortened by the increased water depth, and the depth of the existing steel pipe sheet pile 4 is reduced. Since the passive earth pressure becomes smaller,
To make up for it, near the rear side of the existing steel pipe sheet pile 4,
By newly driving the steel pipe pile 10 deeper than the existing steel pipe sheet pile 4 and joining the existing steel pipe pile 4 and the steel pipe pile 10, the new steel pipe pile 10 receives sufficient passive earth pressure even if the water depth of the water bottom is deepened. It is intended to be. In addition,
As the new steel pipe pile 10, for example, the above-described various sheet piles may be used.

When the new steel pipe pile 10 is driven, pre-drilling is performed with an auger, for example, a donut auger. Then, after performing the above-described ground improvement and driving of the new steel pipe pile 10, the tie material 3 is restored. That is, the existing steel pipe sheet pile 4 and the stay 1 are connected again with the tie material 3 and fastened with a turnbuckle or the like. At this time, the tie material 3 is also attached to the newly installed steel pipe pile, and the existing steel pipe sheet pile 4 and the newly installed steel pipe pile 10 are supported by the stay 1. Next, the upper end of the existing steel pipe sheet pile 4 and the upper end of the new steel pipe pile 10 are integrally solidified with concrete. In addition, a portion excavated to remove the tie material 3 is back-filled with backfill sand or the like (a lightweight embankment material is also possible), a roadbed 11 is formed thereon, and concrete is paved on the roadbed 11.

After the tie material 3 is restored as described above, since the existing steel pipe sheet pile 4 is in a state of being supported by the tie material 3, the support of the existing steel pipe sheet pile 4 by the box 5 is released. Therefore, the hydraulic jack is contracted in the box 5. Next, the box 5 from which the water inside the box 5 has been drained is floated, and the pile 8 is pulled out from the bottom of the water by a pile driving device, so that the box 5 can move on the water.

Basically, the length of the box body 5 that can support the existing steel pipe sheet pile 4 is shorter than the length of the sheet pile type quay wall.
The remodeling of the sheet pile type quay will be done in several times for each of the above-mentioned lengths of the box 5, and when the restoration of the tie material 3 is completed at one remodeling place as described above, The box 5 is moved to the next remodeling location, and the above-mentioned construction is repeated. In this way, the sheet pile type quay is remodeled,
As described above, by driving the new steel pipe pile 10, it is possible to increase the water depth, and after the remodeling of the sheet pile type quay is completed, excavation, dredging, etc. are performed in the port having the sheet pile type quay. Work to deepen the water depth.

In the modification of the sheet pile type quay in the above example, for example, the apron width from the tip of the quay to the stay 1 and the rail span of the rail formed on the existing steel pipe sheet pile 4 and the stay 1 are as follows. , Not changed. That is, the stay 1 is an existing one. In the method of supporting the sheet pile with the box 5 during the remodeling as described above, it is also possible to newly install the stay 1.

[0040]

According to the sheet pile type quay remodeling method according to the first aspect of the present invention, the box body in which water is injected and sunk is pressed by the pressing means against the front surface of the sheet pile of the sheet pile quay. The box is in a state of supporting the sheet pile against the earth pressure on the back. Therefore, even if the remodeling is performed behind the sheet pile type quay, the sheet pile can be supported by the box during the remodeling. And the horizontal displacement of the sheet pile during the remodeling can be prevented. In addition, when the sheet pile type quay uses a stay, since the sheet pile is supported by a box, it is possible to remove the tie material connecting the sheet pile and the stay, so by removing the tie, It can be retrofitted behind a sheet pile quay without being disturbed by timber.

According to the sheet pile type quay remodeling method of the second aspect of the present invention, since the box is supported by the pile driven into the water bottom, when a large force is applied to push the sheet pile forward. Even a lightweight box can reliably support the sheet pile. In addition, by using a pile as described above, the weight of the box can be reduced, and the bottom of the box does not need to be formed in a shape or a material that causes large friction with the water bottom. The cost of the body can be reduced.

According to the sheet pile type quay remodeling method according to the third aspect of the present invention, after the sheet pile is supported by the box, the tie material connecting the sheet pile and the stay is removed, and then the back of the sheet pile is modified. Therefore, the modification behind the sheet pile is not disturbed by the tie material, and the modification behind the sheet pile can be easily performed. Further, the remodeling can be performed more reliably than when the remodeling is performed in a state where the tie material is present.

According to the sheet pile type quay remodeling method of the present invention, since the sheet pile is supported by the box even when the ground is improved behind the sheet pile, horizontal displacement of the sheet pile can be prevented. Can be. Especially, in the case of a sheet pile type quay with a stay, the ground improvement can be performed with the tie material removed, so that the tie material is not hindered by the tie material,
In addition, the ground can be improved evenly. Also, since various machines such as heavy machinery can be arranged behind the sheet pile without being disturbed by the tie material, the ground improvement can be performed by various ground improvement methods without limiting the ground improvement method. .

According to the sheet pile type quay remodeling method according to the fifth aspect of the present invention, since the front surface of the existing sheet pile is pressed by the box, a new pile (sheet pile) is brought close to the back side of the sheet pile. Even when driven, displacement of the existing sheet pile can be prevented. Also, in the sheet pile type quay using the staying work, it is not possible to continuously drive new piles behind the sheet pile because it is disturbed by the Thai material, but the existing sheet pile is supported by the box and the Thai material is removed. This allows the pile to be driven continuously behind the existing sheet pile.

By driving the pile deeper than the existing sheet pile behind the existing sheet pile, the depth of the pile (sheet pile) can be deepened, so that the water depth can be increased at the front side of the sheet pile. After the renovation of the sheet pile type quay has been completed, work to increase the water depth can be performed so that larger ships can be moored.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a sheet pile quay in a state in which the sheet pile quay according to the embodiment of the present invention has been substantially remodeled by the method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Standing work 2 Sheet pile wall 3 Tie material 4 Existing steel pipe pile 5 Case 6 Deck 7 Hydraulic jack (pressing means) 8 Pile 10 New steel pipe pile

Claims (5)

[Claims] 1. A method of remodeling a sheet pile type quay in which an existing sheet pile type quay is modified behind a sheet pile, comprising: a box which can float and sink by draining and pouring water and which can move on the water in a floating state. The sheet pile is moved in front of an existing sheet pile type quay and is sunk, and the back of the sheet pile is modified while the front side of the sheet pile of the sheet pile type quay is pressed by a pressing means provided in the box. How to remodel the quay. 2. The box body is provided with a pile driving means for driving a pile into a water bottom, and when the front surface of the sheet pile is pressed by the pressing means, the pile is driven into the water bottom by the pile driving means, whereby the pile is driven. 2. The method according to claim 1, wherein the box is supported on the bottom of the water by a pile. 3. The sheet pile type quay, wherein the sheet pile quay is a quay,
The stay provided behind the sheet pile is connected with a tie material, and after pressing the front surface of the sheet pile with the pressing means of the box, the tie material is detached from the sheet pile. The method of remodeling a sheet pile type quay according to claim 1 or 2, wherein the back of the sheet pile is remodeled. 4. The method for remodeling a sheet pile type quay according to claim 1, wherein the remodeling is carried out by improving the ground behind the sheet pile. 5. The remodeling of a sheet pile type quay according to claim 1, wherein the remodeling includes driving a new pile near the sheet pile behind the existing sheet pile and deeper than the sheet pile. Method.