JPH067162Y2 - Steel pile guide formwork equipment for underwater foundation construction - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a steel pile guide formwork device used when constructing an underwater foundation of a bridge by a steel leg installation method.

[Conventional technology]

Conventionally, when constructing an underwater foundation of a bridge by a steel leg installation method, first, as shown in FIGS. 11 to 13, a large number of steel frame rods 8 arranged in parallel and adjacent frame rods 8 are used. A large number of steel connecting frame rods 9 for connecting the two, and the frame rod 8 and the steel guide members 10 for steel pile driving guides fixed to the connecting frame rods 9.
And a steel guide frame 1 made of
A steel outer mold 12 is fixed to the periphery of 1 to manufacture a conductive frame 13 with a mold.

Next, as shown in FIG. 14, the guide frame 13 with the formwork is placed on the sand 15 laid in the digging recess of the subseabed 14, and then the mold is placed as shown in FIG. Guide frame with frame 1
Using the steel guide member 10 for steel pile driving guide in 3 as a guide, a steel pile 16 composed of a large number of steel pipe piles and 4 to 6 guide piles 17 located around the guide frame 13 with the formwork are provided on the subseabed 14. Set in.

Next, the steel outer formwork 12, the steel pile 16 and the guide pile 1
Immediately after placing the underwater concrete between the and 7, the diver shaped the surface of the underwater concrete to be smooth,
Subsequently, as shown in FIG. 16, a steel pier frame 18 in which the footing of the pier main body and the pillars and beams are integrated,
It is hung down while being guided by the guide piles 17, and the pier frame 18 thereof is placed on the brackets fixed to the respective guide piles.

Next, as shown in FIG. 17, underwater concrete is placed between the steel footings in the pier frame 18 and the steel piles 16 and the guide piles 17 with the upper part cut off to make the steel footings and the steel piles. 16 and each guide pile 17 are integrated.

[Problems to be solved by the device]

Since the steel guide frame 11 is a erected structure, a guide frame constituent member having a small cross section is used in order to give priority to economic efficiency, and therefore the steel guide frame may be largely deformed during steel pile driving.

When the steel guiding frame 11 is deformed, it is necessary to pull up the guiding frame 13 with formwork from the water to shape it before pouring the underwater concrete, which requires a complicated process.

Immediately after placing the underwater concrete, the diver shapes the surface of the underwater concrete to be smooth, but the surface area of the underwater concrete is remarkably large, and the steel pile 16 and the guide pile 17 are forested above the underwater concrete. In addition, since there is no suitable work scaffold and bad conditions such as the concrete leveling top end indication mark displayed on the side surface of the steel pile 16 are difficult to see, the concrete surface shaping work is difficult and highly precise. The finished surface cannot be obtained.

If the surface accuracy of the underwater concrete cast in the steel outer formwork 12, that is, the previously cast underwater concrete is poor, a gap is created between the surface of the underwater concrete and the lower surface of the steel footing, and the steel footing is formed. Since the underwater concrete placed inside, that is, the submerged concrete that is placed behind leaks from the gap, a sealing material such as rubber sealing material, cloth sealing material or steel rope is attached to the bottom surface of the steel leg frame. is doing. However, if the surface finish accuracy of the pre-cast underwater concrete is poor and there are large irregularities on the surface, the sealing effect will be incomplete, and the space between the lower surface of the steel footing and the recessed portion of the surface of the pre-cast underwater concrete will become insufficient. Subsequent casting underwater concrete leaks. Therefore,
Improving the surface finish accuracy of pre-cast underwater concrete has become a major issue.

In addition, the weight of trailing cast underwater concrete in the steel footing acts on the preceding cast underwater concrete, so if the ground where the steel pier frame is installed is weak,
Since the soft ground cannot support the weight of trailing cast underwater concrete and the load acting on it, the preceding cast underwater concrete will support it. If the rigidity of the conductor 11 is low, the underwater concrete cast in advance may sink or be destroyed, so that measures such as ground improvement may be necessary.

This invention can prevent the deformation of the steel pile guide formwork device when driving the steel pile, and can easily and accurately finish the surface of the underwater concrete cast in the outer formwork into a flat surface. It is an object of the present invention to provide a steel pile guide formwork device for underwater foundation construction capable of performing the above.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the steel pile guide formwork device for underwater foundation construction of the present invention, a large number of steel frame members 1 and 2 are used.
Are arranged in a lattice shape and fixed by welding to form a lattice-shaped frame frame 3, and the steel pile driving is arranged in the lattice-shaped frame frame 3 at the center of each side in each steel pile insertion space 4. The steel guide member 5 for the embedded guide is fixed to the frame members 1 and 2, the lower part of the steel outer formwork 6 is fixed around the lattice-shaped frame 3, and the upper part of each of the frame members 1 and 2 is fixed. A steel work scaffolding and leveling ruler member 7 extending in the longitudinal direction of the frame material is fixed.

[Action]

Using the upper surface of the work scaffolding and leveling ruler member 7 as a ruler, the surface of the underwater concrete 19 cast in the outer formwork 6 is leveled and finished, and the work scaffolding and leveling ruler member 7 The upper surface is used as a work scaffold when placing the underwater concrete 19 and finishing the surface of the underwater concrete 19.

Further, each of the steel frame members 1 and 2 constituting the lattice frame 3
Is reinforced by the steel work scaffolding and leveling ruler member 7, and the lattice-shaped frame 3 is strengthened.

〔Example〕

 Next, the present invention will be described in detail with reference to the illustrated example.

1 to 4 show a steel pile guide formwork device 20 according to an embodiment of the present invention, and FIG. 5 shows a lattice-shaped frame 3 with a steel guide member 5 for a steel pile driving guide. A large number of box-shaped cross-section steel frame members 1 extending in the front-rear direction and a large number of box-section cross-section steel frame members 2 extending in the left-right direction
And are arranged in a lattice shape and fixed by welding to form a lattice-shaped frame frame 3 having a large number of square steel pile insertion spaces 4, and a steel pile is provided at the center of each side in each steel pile insertion space 4. A steel guide member 5 for a driving guide is arranged, and the base end portion of the guide member 5 is fixed to the steel frame members 1 and 2 by welding.

On the upper part of each of the steel frame members 1 and 2, a steel work scaffolding and leveling ruler member 7 having a T-shaped cross section extending in the front-rear direction and the left-right direction.
Is placed and fixed by welding, and the lower part of the steel plate outer mold 6 is fixed by welding to the outer periphery of the lattice-shaped frame 3, and further the outer mold 6 and the surrounding work scaffolding and leveling ruler member 7 And a large number of steel plate connecting members 21 are arranged at intervals in the circumferential direction of the outer mold, and the connecting members 2
1 is fixed to the outer formwork 6 and the work scaffolding / smoothing ruler member 7 by welding, and the horizontal upper surface of the work scaffolding / smoothing ruler member 7 is at the same level as or substantially the same as the horizontal upper surface of the outer formwork 6. It is located on the level.

FIG. 6 shows a modified example of the steel pile guide formwork apparatus, in which H-shaped steel is used as the steel frame members 1 and 2 in the middle part, and the outer formwork 6 made of a steel plate is attached to the surrounding area. A channel steel is used as the frame material 1A, and a steel work scaffolding and leveling ruler member 7 having a T-shaped cross section is arranged above the steel frame materials 1 and 2 separately. The work scaffolding and leveling ruler member 7 and the work scaffolding 2 and the leveling ruler member 7 are welded to each other at each intersection of the work scaffolding and leveling ruler members 7 arranged in a lattice pattern.

In the case of the steel pile guide formwork device shown in FIG. 6, since each partition part partitioned by the work scaffolding and leveling ruler member 7 communicates with each other, the filling property of concrete is improved, and Compared with the steel pile guide formwork device shown in Figs. 4 to 4, the amount of steel used is small, which is economical.

FIG. 7 shows a steel pier frame 2 with a sealing material used in combination with the steel pile guide formwork device 20 of the embodiment of the present invention.
2 shows a steel frame member 23 having a flange at its lower end, which is arranged on a lattice and fixed to each other by welding, to form a lattice frame 24, and the lattice frame thereof. A steel footing formwork 25 is fixed to the outside of the frame 24 by welding, and the steel frame members 23 constituting the lattice-shaped frame 24 are arranged at the same intervals as the steel work scaffolding and leveling ruler members 7. Further, a rubber sealing material 26 is fixed by an adhesive over the entire length of the lower surface of each steel frame member 23 constituting the lattice-shaped frame 24.

8 to 10 show a usage state of the steel pile guide formwork apparatus 20 according to the embodiment of the present invention. First, the sand pile 15 laid in the digging recess of the water bottom ground 14 is shown. A steel pile guide formwork device 20 is placed on the top, and four guide members 5 in each steel pile insertion space 4 of the frame frame 3 are placed.
A steel pile 16 composed of a steel pipe pile is inserted between the
6 is cast on the water bottom ground 14 using the four guide members 5 as guides, and the upper portion of each steel pile 16 is a steel pile guide formwork device 20.
Is projected above the upper surface of.

Next, underwater concrete 19 is placed in a portion surrounded by the steel outer formwork 6, and the upper surface of the underwater concrete 19 is at the same level as the outer formwork 6 and the upper surfaces of the work scaffolding and leveling ruler member 7. Thus, the upper surfaces of the outer formwork 6 and the work scaffolding / leveling ruler member 7 are leveled as a leveling ruler and finished in a flat shape. In this case, the upper surface of the work scaffolding and leveling ruler member 7 is used as a ruler for leveling the underwater concrete 19 and also as a work scaffold for a diver when performing underwater concrete placing work and underwater concrete leveling work. Is also used.

Next, as shown in FIG. 9 and FIG. 10, on the steel pile guide formwork device 20 in which the underwater concrete 19 is placed,
The steel pier frame 22 with sealant was hung down,
The rubber sealing material 26 is placed on the upper surfaces of the steel work scaffolding and leveling ruler member 7 and the underwater concrete 19, and then the footing concrete 27 is placed in the footing form 25. In this case, the sealing material 26 is placed on the upper surfaces of the horizontal steel work scaffolding and leveling ruler member 7 and the underwater concrete 19, so that the footing concrete 27 is prevented from leaking.

When pouring and leveling the underwater concrete 19 in the outer formwork 6, the surface of the underwater concrete 19 may be leveled so as to be a plane slightly lower than the upper surface of the work scaffolding / leveling ruler member 7. .

When carrying out this invention, as the frame members 1 and 2 and the work scaffolding / leveling ruler member, those having an arbitrary cross section other than those shown in the drawings may be used.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

Since the steel work scaffolding and leveling ruler member 7 is fixed to the upper portions of the frame members 1 and 2 constituting the lattice-shaped frame 3,
When the underwater concrete 19 cast in the steel outer formwork 6 is leveled and surface-finished, the upper surface of the work scaffolding / leveling ruler member 7 is used as a leveling ruler, and the surface leveling of the underwater concrete 19 is performed. The finishing work can be performed with high accuracy, and the diver can use the upper surface of the work scaffolding and leveling ruler member 7 as a work scaffolding to place the underwater concrete 19 in the steel outer formwork 6 and The surface of the underwater concrete 19 can be leveled easily and safely, and each of the steel frame members 1 and 2 constituting the lattice-shaped frame 3
Is reinforced by the steel work scaffolding and leveling ruler member 7, and the lattice-shaped frame 3 is reinforced, so that it is possible to prevent the frame 3 from being deformed when the steel pile is driven,
Therefore, it is not necessary to perform the complicated work of pulling up the deformed steel pile guide formwork device from the water and shaping it, and moreover, the lattice-shaped frame 3 with the guide member 5 is required.
Since the work scaffolding and leveling ruler member 7 and the outer formwork 6 are integrated, the underwater foundation can be constructed with high efficiency and at low cost.

Further, since the surface of the underwater concrete 19 can be finished with high accuracy, the steel footing type in the steel work scaffolding and leveling ruler member 7 and the steel pier frame 22 with the sealing material placed on the underwater concrete 19 When the footing concrete 27 is placed in the frame 25, the footing concrete can be prevented from leaking, and the foundation created by the preceding placing is a solid steel pile guide formwork device 20 and underwater concrete. Therefore, even if the ground of the underwater foundation installation part is soft, it is possible to prevent the preceding foundation to be destroyed or settled during the placing of footing concrete.

[Brief description of drawings]

1 to 4 show a steel pile guide formwork apparatus for underwater foundation construction according to an embodiment of the present invention.
The drawing is a plan view, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a sectional view taken along line BB of FIG. 1, and FIG. 4 is an enlarged view of part of FIG. FIG. FIG. 5 is a plan view showing a lattice-shaped frame with a steel guide member for a steel pile driving guide,
FIG. 6 is a vertical sectional side view showing a modified example of the steel pile guide formwork device, and FIG. 7 is a partial vertical sectional front view showing a steel pier frame with a sealing material. Fig. 8 is a vertical sectional front view showing a state in which the steel pile guide formwork device is installed and underwater concrete is placed in the outer formwork, and Fig. 9 is a steel pile pier frame with a sealant attached to the steel pile guide formwork. FIG. 10 is a partial vertical sectional front view showing a state in which footing concrete is placed by placing it on an underwater foundation consisting of the device and the underwater concrete therein.
It is a vertical front view which expands and shows a part of figure. 11 to 13 show a conventional steel guide frame, in which FIG. 11 is a plan view and FIG. 12 is C- in FIG.
C line enlarged sectional view, FIG. 13 is a DD line enlarged sectional view of FIG. FIG. 14 to FIG. 17 are schematic vertical sectional front views showing the installation sequence of the conventional underwater foundation and steel pier frame. In the figure, 1 is a steel frame member, 2 is a steel frame member, 3 is a lattice frame frame, 4 is a steel pile insertion space, 5 is a steel guide member for a steel pile driving guide, and 6 is a steel outer mold. Frame, 7 steel work and leveling ruler member, 19 underwater concrete, 20 steel pile guide formwork device, 21 steel plate connecting member, 22 steel pier frame with sealing material, 23 steel frame material , 24 is a lattice frame frame, 25 is a steel footing form, 26 is a rubber sealing material, and 27 is footing concrete.

Claims (1)

[Scope of utility model registration request] 1. A large number of steel frame members 1 and 2 are arranged in a grid pattern and are fixed by welding, and a grid frame frame 3 is formed.
And a steel guide member 5 for steel pile driving guides arranged at the center of each side in each steel pile insertion space 4 in the lattice frame 3 is fixed to the frame members 1 and 2, The lower part of the steel outer formwork 6 is fixed around the lattice-shaped frame 3, and the steel work scaffolding and leveling ruler member 7 extending in the longitudinal direction of the frame material is fixed to the upper part of each of the frame materials 1 and 2. Steel pile guide formwork equipment for underwater foundation construction.