JP6826957B2 - How to install support - Google Patents

Description

The present invention relates to a method of installing a support work.

When constructing a structure such as a pier in a water area, a temporary deadline such as a steel pipe sheet pile is placed in a well-shaped cylinder to close the water area, and the ground inside the water area is excavated to a predetermined depth and dried up. May be built.

At this time, a support work is installed inside the well cylinder by the temporary cut-off body to resist the surrounding water pressure (see, for example, Patent Documents 1-3).

Japanese Unexamined Patent Publication No. 4-155010 Patent No. 2949341 Patent No. 3051321

The support work is installed by suspending it from above with, for example, a crane. However, it is generally time-consuming to properly install the support work inside the temporary deadline, and the current situation is that the installation work of the support work requires a great deal of labor and time.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for installing a support work that can be easily and appropriately installed.

The present invention for solving the above-mentioned problems is a method of installing a support work inside a temporary cut-off body that closes a water area, and is a height including an elastic member inside the temporary cut-off body. A step (a) of providing a bracket body having an adjusting portion on the upper surface, and a step (b) of suspending the support work having a spacer attached to the outside inside the temporary cutoff body and installing the support work on the bracket body. ), And is a method of installing a support work, which is characterized by having.

In the present invention, by attaching a spacer to the support work and suspending it, the support work can be correctly installed inside the temporary cutoff body without any bias in position. In addition, by providing a height adjustment part including an elastic member on the bracket body on which the support is installed, the installation error of the bracket body is absorbed, and the load of the support is evenly applied to the bracket body when the support is installed. It becomes possible to convey. This makes it possible to easily and appropriately install the support work.

The height adjusting portion is provided with a cover on an elastic member, and the cover is substantially concave and is preferably arranged with the open side facing down.
As a result, the elastic member can be covered with a cover so as not to come off from the bracket body.

In the step (b), before releasing the suspension support of the support, the height of the height adjusting portion is adjusted so that the height adjusting portion is in contact with the lower surface of the support, and then the above. It is desirable to release the suspension support of the support work.
As a result, when there is a gap between the support and the bracket body, the gap can be eliminated and the load of the support can be correctly transmitted to the bracket body.

When adjusting the height of the height adjusting portion, it is desirable to arrange the plate material in the height adjusting portion.
As described above, the height adjustment of the height adjusting portion can be easily performed by using the plate material.

The height adjusting portion has a cover provided on an elastic member, the cover has a substantially concave shape, is arranged with the open side facing down, and the plate material is inserted inside the cover. It is desirable to be done.
For height adjustment using a plate material, the plate material may be inserted inside the cover to raise the height adjustment part, and by arranging the plate material inside the cover, the plate material will not come off from the bracket body. ..

It is desirable that the spacer is attached after at least the height of the lower end of the support work is equal to or lower than the upper end of the temporary cutoff body.
In this way, by attaching the spacer after suspending the support work inside the temporary cutoff body, the spacer may interfere with the upper end of the temporary cutoff body when the support work is suspended inside the temporary cutoff body. It disappears.

It is desirable that the bracket main body is attached to the bracket receiving material, the upper end portion of the bracket receiving material is on the water, and the hooking portion provided on the upper end portion is fixed to the upper end portion of the temporary cutoff body.
As a result, when the bracket is attached, the height of the bracket body can be grasped on the water by the height of the upper end of the bracket receiving material or the like, which leads to improvement in the installation accuracy of the bracket body. Further, the hooking portion can be fixed on the water, which is easy.

It is desirable that the support works are arranged in an annular shape along the inner circumference of the temporary cut-off body, have an opening at the center, and have a truss structure on a flat surface.
In the present invention, it is possible to increase the rigidity of the support work by assuming that it has a truss structure on a flat surface, and to provide a large opening at the construction location of the structure in the center of the inside of the temporary cutoff body, thereby eliminating interference between the structure and the support work. .. In addition, when constructing a structure, it is possible to insert long reinforcing bars, large formwork, etc. from a large opening, and the size limit of input materials is small, and other large openings can be used to significantly improve the work environment. Therefore, efficiency can be improved in the whole work.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a method of installing a support work that can be easily and appropriately installed.

The figure explaining the deadline of the water area 3. The figure explaining excavation of ground 2. The figure which shows the truss support 1 and the support unit 10. The figure explaining the installation of the support work unit 10. The figure which shows the spacer 19. The figure which shows the bracket 8. The figure which shows the elastic member 861 and the cover 862. The figure explaining the construction of a pier 74 and the like. The figure which shows the bracket 8'. The figure which shows the pier 74.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

In the method of installing the support according to the embodiment of the present invention, the temporary deadline of the water area is performed by a temporary deadline such as a steel pipe sheet pile, and when the structure is constructed inside the temporary deadline, the temporary deadline is reinforced to reinforce the surrounding water pressure. An example of installing a support work to resist the problem will be described.

In the present embodiment, as shown in FIG. 1A, a steel pipe sheet pile 4 which is a temporary cutoff body is first driven into the ground 2 at the bottom of the water to form a closed region on a flat surface, and the water area 3 to be constructed is closed. .. The steel pipe sheet pile 4 is provided in a well-shaped shape as shown in FIG. 1 (b). FIG. 1 (b) is a view of FIG. 1 (a) from above.

In this example, the steel pipe sheet pile 5 is driven into the ground 2 on the bottom of the water to form a partition wall inside the well cylinder made of the steel pipe sheet pile 4. The steel pipe sheet piles 5 are provided in a row so as to connect a pair of opposite sides of the wells formed by the steel pipe sheet piles 4. If necessary, concrete by arranging reinforcing bars in the steel pipe in a predetermined section in the vertical direction of the steel pipe sheet piles 4 and 5 (for example, the section from the top plate concrete to the vicinity of the paving stone layer and the lower end of the steel pipe sheet piles 4 and 5 described later). It is also possible to reinforce by filling with concrete. Although not shown, the adjacent steel pipe sheet piles 4 and 5 are connected to each other by a joint, and the joint portion of the steel pipe sheet pile 4 forming the well is water-stopped.

The steel pipe sheet piles 4 and 5 are driven by using the guide frame 6. The guide frame 6 has an outer frame 6a arranged along the outer circumference of the well by the steel pipe sheet pile 4, and two inner frames 6b arranged along both sides of the inner circumference of the well by the steel pipe sheet pile 4 and the partition wall by the steel pipe sheet pile 5. Consists of. A diagonal member 61 is arranged at a corner of each inner frame 6b. After placing the steel pipe sheet piles 4 and 5, the guide frame 6 is attached to the tops of the steel pipe sheet piles 4 and 5.

After that, as shown in FIG. 2, the ground 2 inside the well cylinder by the steel pipe sheet pile 4 is excavated underwater to a predetermined depth while maintaining the water level, and the paving stone layer 71 and the bottom concrete 72 are constructed at the excavation bottom. Underwater excavation is carried out by installing an excavator such as a grab on the crane of a dredger (not shown). After excavating the ground 2 and placing the bottom concrete 72, the steel pipe sheet pile 5 is cut at a position corresponding to the upper surface of the bottom concrete 72, and the upper portion thereof is removed.

In the present embodiment, the excavation of the ground 2 is performed with the guide frame 6 left, and after the excavation, the inner frame 6b is removed so as not to hinder the installation of the support work described later. As a result, when excavating the ground 2, the guide frame 6 functions as a reinforcing work for suppressing deformation of the steel pipe sheet pile 4 with respect to wakes generated by ships navigating in the vicinity. After the bottom concrete 72 is constructed and the inner frame 6b is removed, the steel pipe sheet pile 4 is held by the outer frame 6a and the bottom concrete 72 to suppress deformation of the steel pipe sheet pile 4.

In the present embodiment, after that, a support work is installed inside the steel pipe sheet pile 4. For the support work, the truss support work 1 whose plane is shown in FIG. 3A is used.

The truss support 1 has a substantially square-shaped annular plane, and has a large-area opening 15 at the center. The plane of the truss support 1 has a truss structure in which a plurality of vertical members 11 and horizontal members 12 are combined in a grid pattern and diagonal members 14 are provided in the grid. The diagonal members 14 are also provided at the four corners of the opening 15.

In the present embodiment, as shown in FIG. 3B, the truss support 1 is vertically connected by a truss structure in which horizontal members 18 are provided above and below the plurality of vertical members 16 and diagonal members 17, and the support unit 10 is connected. Used as (support work). The support unit 10 is assembled and manufactured in advance on the ground or on the water.

The diagonal members 17 are arranged in a substantially X shape between adjacent vertical members 16. The plane of the horizontal member 18 has a rectangular frame shape. Steel materials such as H-shaped steel are used for the vertical member 16, the diagonal member 17, the horizontal member 18, and the vertical member 11, the horizontal member 12, and the diagonal member 14.

In the present embodiment, the support unit 10 is carried to the site, suspended from a crane or the like of a hoisting vessel, suspended inside the steel pipe sheet pile 4, and supported inside the steel pipe sheet pile 4 as shown in FIG. 4A. The work unit 10 is hung and lowered.

The support unit 10 is carried to the site by a pontoon, and the support unit 10 is suspended via a grid-shaped suspension frame (not shown). When the support unit 10 is suspended inside the steel pipe sheet pile 4, a guide material such as H-shaped steel is provided at the upper end of the steel pipe sheet pile 4 as needed to guide the support unit 10. The wire attached to the support unit 10 is operated with a winch such as a chill hole for positioning when the support unit 10 is loaded on the pontoon by a crane or when the support unit 10 is suspended inside the steel pipe sheet pile 4. You can also do it.

In the present embodiment, when the support unit 10 is lowered inside the steel pipe sheet pile 4, a rod-shaped support member 7 is attached to the outer peripheral portion of the support unit 10 as shown in FIG. 4A. A fully screwed steel rod is used for the support member 7, and the support member 7 is arranged so as to be inclined inward as it goes downward.

Further, when the support unit 10 is lowered, as shown in FIG. 5A, the spacer 19 for positioning the support unit 10 is provided on each side of the outer peripheral portion of the truss support 1 above the support unit 10. It is mounted on the outside. The spacer 19 is attached after the support unit 10 is suspended and the height of the upper end thereof is equal to or lower than the upper end of the steel pipe sheet pile 4.

As shown in FIG. 5B, in the spacer 19, the spacer main body 191 is hooked on the vertical member 11 and the horizontal member 12 of the truss support 1 by the hooking portion 192, and the spacer 19 is vertically mounted using a narrowing metal fitting (not shown) or the like. It is fixed to the material 11 and the cross member 12. A square steel pipe or the like is used for the spacer main body 191 and the rigidity is lower than that of the vertical member 11 and the horizontal member 12 (for example, H-shaped steel).

In the present embodiment, the support unit 10 is lowered to a predetermined position as shown in FIG. 4B while sequentially adding a plurality of steel rods as the support material 7 with a coupler or the like. The position (height) of the support unit 10 can be grasped from the measuring tape (not shown) attached to the support unit 10, the length and number of the added steel rods, and the like.

When the support unit 10 is arranged at a predetermined position, the upper end portion of the support member 7 is held by the support member receiving portion 9 provided at the upper end of the steel pipe sheet pile 4. The support material receiving portion 9 has a center hole jack 91 and the like, and the support material 7 is held by the center hole jack 91 to adjust the tension force thereof, and the support support unit 10 is suspended and supported.

Regarding the above-mentioned addition of steel rods and installation of the support material receiving portion 9, a temporary scaffold (not shown) is provided in advance at the upper end of the steel pipe sheet pile 4, and the work is performed there. Further, since the center hole jack 91 is a heavy object, the installation work can be performed by attaching the chain block to a frame (not shown) provided at the upper end of the steel pipe sheet pile 4 and suspending the center hole jack 91. ..

In the present embodiment, the support unit 10 is supported by the support material 7 from a plurality of locations (for example, about 20 locations). The tension force of the support member 7 at this time is controlled so as not to exceed the control value, and is finally adjusted to an appropriate value.

As a result, the support unit 10 is arranged in an annular shape along the inner circumference of the well cylinder by the steel pipe sheet pile 4. After installing the support unit 10 in this way, the bracket 8 is attached to the inside of the steel pipe sheet pile 4 above the support unit 10 as shown in FIG. 4 (c). A plurality of brackets 8 are provided along the inner circumference of the well cylinder formed by the steel pipe sheet pile 4. These brackets 8 support the support unit 10 described later.

FIG. 6A is a diagram showing a bracket 8. In the present embodiment, a substantially right-angled triangular bracket body 82 joined to the lower end of a long bracket receiving member 81 made of channel steel or the like with bolts or the like is attached to the steel pipe sheet pile 4. The upper end of the bracket receiving material 81 is on the water, and by measuring the height of the upper end, the position (height) of the bracket body 82 can be grasped on the water from the measured value and the member length of the bracket receiving material 81. While doing so, the bracket 8 can be attached.

A hooking portion 83 is provided at the upper end portion of the bracket receiving member 81. The hook portion 83 is fixed to a mounting member (not shown) provided at the upper end of the steel pipe sheet pile 4 with bolts or the like. The mounting material is, for example, a steel material such as H-shaped steel, and is fixed in the steel pipe by welding or the like. Further, if necessary, a liner plate or the like is inserted between the hook portion 83 and the mounting material to adjust the height of the bracket 8.

The bracket receiving material 81 is welded to the steel pipe sheet pile 4 at the welded portion 84 on the water and the welded portion 85 underwater. These welding operations are performed after the hook portion 83 is fixed, and by firmly fixing the bracket 8 to the steel pipe sheet pile 4, the proof stress of the bracket 8 against the load of the support unit 10 can be increased. However, it is also possible to omit these weldings.

Further, in the present embodiment, the height adjusting portion 86 is provided on the upper surface of the bracket main body 82. As shown in FIG. 6B, the height adjusting portion 86 is formed by sequentially installing a plate-shaped elastic member 861 such as a rubber sheet and a cover 862 on the bracket main body 82.

FIG. 7A is a perspective view showing the height adjusting unit 86. As shown in the figure, the cover 862 has a substantially concave cross section, and is arranged so as to cover the elastic member 861 with the open side facing down. A notch 862a is provided on the side surface of the cover 862 so that the elastic member 861 mounted on the bracket main body 82 can be visually recognized from the side.

In the present embodiment, after the bracket 8 is attached and the bracket main body 82 is provided inside the steel pipe sheet pile 4, the new support unit 10 is suspended from the crane or the like of the hoisting machine ship in the same manner as described above. It is hung inside the sheet pile 4, hung and lowered inside the steel pipe sheet pile 4, and installed on the bracket 8 (bracket body 82) as shown in FIG. 4 (d).

Here, after the height of the lower end of the support unit 10 is at least equal to or lower than the upper end of the steel pipe sheet pile 4, on the outside of each side of the outer peripheral portion of the truss support 1 at the lower part of the support unit 10, FIG. Install the spacer 19 as described. As a result, in addition to positioning the support unit 10, contact with the support member 7 when the support unit 10 is lowered can be prevented. The width of the spacer body 191 (corresponding to the length in the left-right direction of FIG. 5B) is made thinner than the previous one in consideration of the fact that the bracket receiving material 81 protrudes inside the steel pipe sheet pile 4. deep.

Regarding the installation of the support unit 10, it is necessary to apply a load evenly to the bracket body 82 of each bracket 8, and if an unbalanced load is applied, the support unit 10 may fall due to the destruction of the bracket 8. is there.

However, in the present embodiment, by arranging the height adjusting portion 86 including the elastic member 861 on the bracket body 82 as described above, the installation error of the bracket body 82 can be absorbed to some extent by the deformation of the elastic member 861. , Unbalanced load can be suppressed.

Further, in the present embodiment, the support unit 10 is suspended to the position of the bracket body 82, a part (for example, about 30%) of the suspension load of the crane is released, and then the support unit 10 for each bracket body 82 is performed by a diver. Visually check the installation condition of the above at all locations. After the confirmation is completed, the suspension support from the crane is released, and the entire load of the support unit 10 is deposited in the bracket main body 82.

At the time of confirmation by a diver, the degree of crushing of the elastic member 861 is visually observed from the notch 862a of the cover 862, and there is a gap C between the bracket body 82 and the support unit 10 as shown in FIG. 7 (b). The width is measured by inserting a feeler gauge 30 into the gap C or the like. Then, as shown in FIG. 7C, one or a plurality of liner plates 88 (plate materials) having a predetermined thickness are sandwiched inside the cover 862 to raise the height adjusting portion 86, and the height adjusting portion 86 is supported. The load is transmitted to the bracket main body 82 in contact with the lower surface of the unit 10.

After that, by filling the space between the truss support 1 of each stage and the steel pipe sheet pile 4, the truss support 1 of the upper and lower four stages is divided into two support units 10 and the steel pipe sheet pile 4 forms the inner circumference of the well. A temporary deadline structure 20 (see FIG. 4D) arranged in an annular shape is formed along the line.

After forming the temporary deadline structure 20 in this way, the construction of the structure is started. In this embodiment, the pier is constructed on the top slab concrete as a structure.

Therefore, in the present embodiment, as shown in FIG. 8A, the inside of the well cylinder is drained by the steel pipe sheet pile 4 to dry up, and the trusses of the first, third, and fourth stages (meaning the number of stages when counted from the top). Attach the bracket 8'at the position that supports the support work 1.

FIG. 9 is a diagram showing a bracket 8'. The bracket 8'is formed by joining a short bracket receiving material 81'to a steel pipe sheet pile 4 by welding or the like, and then attaching a substantially right-angled triangular bracket body 82 to the bracket receiving material 81'with bolts or the like.

After that, as shown in FIG. 8B, a top slab concrete 73 made of reinforced concrete is constructed on the bottom concrete 72.

Then, in the opening 15 of the truss support 1 (see FIG. 3A), a reinforced concrete pier 74 is constructed on the top slab concrete 73 as shown in FIG. 8C. The support unit 10 is removed according to the progress of the work. FIG. 8C shows a state after the lower support unit 10 is removed. After that, as shown in FIG. 8D, water is injected into the well cylinder by the steel pipe sheet pile 4, and the support unit 10 and the outer frame 6a are all removed.

Hereinafter, earth and sand are backfilled inside the well cylinder by the steel pipe sheet pile 4, and the steel pipe sheet pile 4 is removed. The steel pipe sheet pile 4 can be used as a bridge pier foundation together with the steel pipe sheet pile 5 by cutting at a position corresponding to the upper surface of the top plate concrete 73 and removing only the upper portion thereof. This state is shown in FIG.

As described above, in the present embodiment, by attaching the spacer 19 to the support unit 10 and suspending it, the support unit 10 can be correctly installed inside the steel pipe sheet pile 4 without any bias in position. Further, by providing the bracket body 82 with the height adjusting portion 86 including the elastic member 861, the installation error of the bracket body 82 is absorbed, and when the support unit 10 is installed, the support unit 82 is evenly provided. It is possible to transmit 10 loads. This makes it possible to easily and appropriately install the support unit 10.

Further, in the present embodiment, the elastic member 861 is arranged on the bracket main body 82, and the elastic member 861 is arranged on the cover 862 with the substantially concave cover 862 facing down. It can be covered so that it does not come off from the bracket body 82.

Further, in the present embodiment, before releasing the suspension support of the support unit 10 by the crane, the height of the height adjusting portion 86 is adjusted so as to be in contact with the lower surface of the support unit 10, and then the support unit 10 By releasing the suspension support of the above, when there is a gap between the support unit 10 and the bracket body 82, the gap is eliminated and the load of the support unit 10 can be correctly transmitted to the bracket body 82.

The height adjustment of the height adjusting unit 86 can be easily performed by using the liner plate 88 as described above. In the present embodiment, the liner plate 88 is inserted inside the cover 862 to raise the height adjusting portion 86, and by arranging the liner plate 88 inside the cover 862, the liner plate 88 is removed from the bracket body 82. It won't come off.

Further, in the present embodiment, the spacer 19 is attached after at least the height of the lower end of the support unit 10 is equal to or lower than the upper end of the steel pipe sheet pile 4. In this way, by attaching the spacer 19 after suspending the support unit 10 inside the steel pipe sheet pile 4, the spacer 19 is attached to the steel pipe sheet pile 4 when the support unit 10 is suspended inside the steel pipe sheet pile 4. It does not interfere with the upper end.

Further, in the present embodiment, when the bracket 8 is attached, the height of the bracket main body 82 can be grasped on the water by the height of the upper end of the bracket receiving member 81 or the like, which leads to improvement in the installation accuracy of the bracket main body 82. Further, the above-mentioned fixing work of the hooking portion 83 at the upper end portion of the bracket receiving material 81 can be performed on water, and the work is easy.

Further, in the present embodiment, the support unit 10 (truss support 1) having a truss structure on a flat surface is used as the support to increase the rigidity, and the steel pipe sheet pile 4 is used to construct a structure such as a bridge pier 74 in the center of the inside of the well. It is possible to provide a large opening at the location, and the interference between the structure and the support unit 10 is eliminated. In addition, when constructing a structure, it is possible to insert long reinforcing bars and large formwork from a large opening, and the size limit of input materials is small, and other large openings can be used to significantly improve the work environment. , Efficiency is improved in the whole work.

However, the present invention is not limited to this. For example, instead of the bracket 8 described above, the bracket 8'described in FIG. 9 or the like can be used, and the height adjusting portion 86 can be provided on the upper surface of the bracket body 82.

Further, in the present embodiment, a support unit 10 in which the upper and lower truss support 1s are connected by a truss structure made of a vertical member 16 and a diagonal member 17 is used for construction, and the upper and lower four-stage truss support 1 is installed. There is no limit.

For example, it is possible to install each of the plurality of stages of truss support works 1 independently without connecting them. In this case, the truss support 1 of each stage is hung individually in sequence, and these truss support 1 can be supported by the bracket body 82 provided with the same height adjusting portion 86 as described above. is there. Further, the spacer 19 can also be attached to the outside of the truss support 1 in the same manner as described above.

Further, the steel pipe sheet pile 4 need only form a closed region on a flat surface, and is not limited to the one that closes the water area 3 in a well-shaped manner. For example, the water area 3 may be closed in a cylindrical shape. In this case, the plane of the truss support may be a substantially circumferential annular plane. Further, instead of the steel pipe sheet pile 4, a steel sheet pile or other member may be used as a temporary cutoff body.

Further, the present invention can be applied to a support having a configuration different from that of the support unit 10 or the truss support 1 described above, and can be applied even when the truss structure is not provided on a flat surface or a vertical surface, for example.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

1: Truss support 2: Ground 3: Water area 4, 5: Steel pipe sheet pile 6: Guide frame 7: Support material 8, 8': Bracket 9: Support material receiving part 10: Support unit 11: Vertical material 12: Horizontal material 14, 17, 61: Diagonal material 15: Opening 16: Vertical material 17: Oblique material 18: Horizontal material 19: Spacer 20: Temporary deadline structure 30: Gap gauge 71: Paving stone layer 72: Bottom concrete 73: Top plate concrete 74: Bridge piers 81, 81': Bracket receiving material 82: Bracket body 83, 192: Hooking part 84, 85: Welded part 86: Height adjusting part 88: Liner plate 91: Center hole jack 191: Spacer body 861: Elastic member 862: Cover 862a: Notch

Claims (8)

It is a method of installing a support work inside a temporary deadline that closes the water area.
A step (a) of providing a bracket body having a height adjusting portion including an elastic member on the upper surface inside the temporary cutoff body.
A step (b) of suspending the support with a spacer attached to the outside inside the temporary cutoff body and installing the support on the bracket body.
A method of installing a support work, which is characterized by having. The height adjusting portion has a cover provided on the elastic member.
The method for installing a support work according to claim 1, wherein the cover has a substantially concave shape and is arranged with the open side facing down. In the step (b)
Before releasing the suspension support of the support, the height of the height adjusting portion is adjusted so that the height adjusting portion is in contact with the lower surface of the support, and then the suspension support of the support is released. The method for installing a support work according to claim 1 or 2, wherein the support work is to be performed. The method for installing a support work according to claim 3, wherein when adjusting the height of the height adjusting portion, a plate material is arranged in the height adjusting portion. The height adjusting portion has a cover provided on the elastic member.
The cover is substantially concave and is placed with the open side down.
The method for installing a support work according to claim 4, wherein the plate material is inserted inside the cover. The installation of the support work according to any one of claims 1 to 5, wherein the spacer is attached at least after the height of the lower end of the support work is equal to or lower than the upper end of the temporary cutoff body. Method. The bracket body is attached to the bracket receiving material,
The support according to any one of claims 1 to 6, wherein the upper end portion of the bracket receiving material is on the water, and the hook portion provided on the upper end portion is fixed to the upper end portion of the temporary cutoff body. How to install the work. The support work according to any one of claims 1 to 7, wherein the support work is arranged in an annular shape along the inner circumference of the temporary cutoff body, has an opening at the center, and has a truss structure in a plane. The installation method of the support work described.

Images