JP6302288B2 - Formwork installation method, formwork and underwater structure - Google Patents

Description

  The present invention relates to a mold installation method, a mold, and an underwater structure for installing a mold in water.

  When constructing underwater structures, formwork is placed in the water and concrete is placed. As a method for installing the formwork, it is common to place a steel pipe pile on the bedrock of the water bottom, and to install a steel formwork between adjacent steel pipe piles (for example, see Patent Document 1).

JP 2001-40630 A

  However, the method of placing a pile on the bottom of the water and installing the steel formwork forms a formwork underwater, and therefore the number of underwater work processes by divers increases and the burden is large. In addition, the rigidity of the entire formwork tends to be weak, and it is difficult to stand by itself when placing concrete, and a support work is often required inside the formwork.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a mold installation method and the like that can reduce the underwater work and can easily stand the mold.

The first invention for achieving the above-described object is a precast formwork formed by connecting adjacent formwork panels with the pillar part of the tubular body having the pillar part and the pile part integrally in the vertical direction , It is a formwork installation method characterized by inserting and placing the pile portion in a drilling hole in the bottom of the water.
2nd invention inserts the said pile part in the excavation hole of a water bottom for the precast formwork formed by connecting adjacent formwork panels with the said pillar part of the tubular body which has a pillar part and a pile part. The pile portion has a hole on a side surface, injects concrete from the inside of the tubular body, and fills the excavation hole with concrete.

  In the present invention, it is possible to reduce the underwater work by the diver by installing the precast formwork assembled in advance with the formwork panel and the pipe by inserting the pile portion of the pipe into the excavation hole in the bottom of the water. The precast formwork can be firmly assembled by the formwork panel and the tube, and can be easily made independent by appropriately determining the length of the pile portion.

In the second aspect of the invention, the pile portion has a hole in the side surface, by injecting concrete from the interior of the tubular body, by filling concrete into the excavation hole, borehole concrete through the pile portion By filling in, the precast formwork can be solidified and reliably become independent.

A temporary receiving jig is provided at a lower end portion of the pillar portion, and a sheath tube having a hole on a side surface is disposed in the excavation hole, and the upper end portion of the sheath tube projects from the water bottom, and the precast formwork is installed. Sometimes it is desirable to insert the pile portion into the sheath tube and support the temporary receiving jig with the sheath tube.
Accordingly, the temporary casting jig is supported by the sheath tube to position the precast formwork, and can be installed horizontally even when the bottom of the water is uneven. Further, the excavation hole can be protected by the sheath tube, and the pile portion can be easily inserted.

It is preferable that a skirt material is provided on the formwork panel, and a gap between the formwork and the installation surface of the formwork is closed by the skirt material when the precast formwork is installed.
Thereby, even when a gap is formed between the precast formwork and the installation surface, the gap can be closed with the skirt material, and concrete can be suitably placed inside the formwork.

The formwork panel is preferably a steel plate provided with a reinforcing material.
Thereby, the rigidity of a formwork panel can be improved.

It is desirable to fasten the precast form to the lateral installation surface using a fastening material.
The tightening material can disperse the horizontal force acting on the formwork when placing concrete, for example, and load it on the installation surface.

3rd invention inserts the said pile part in the excavation hole of a water bottom for the precast formwork formed by connecting adjacent formwork panels with the said pillar part of the tubular body which has a pillar part and a pile part. Te was placed, the upper end of the tubular body, and a dish-shaped portion, and the diameters from dish small cylindrical portion on said dish-shaped portion is provided, on the precast mold, adjacent A precast formwork formed by connecting the formwork panels to each other with a tubular body having a receiver inside the lower end portion, supporting the receiver with the tubular portion, and the dish-shaped portion, It is a mold installation method characterized by filling a filler into the outside of the cylindrical part.
Thereby, the precast formwork can be stacked and installed according to the required height, and the position of the upper precast formwork can be easily fixed.

4th invention is the precast formwork installed in water, Comprising: Adjacent formwork panels were formed by connecting the pillar part of the tubular body which has a pillar part and a pile part up and down integrally. It is a precast formwork characterized.
5th invention is the precast formwork installed in water, Comprising: Adjacent formwork panels are formed by connecting the pillar part of the tubular body which has a pillar part and a pile part, and the pile part is It is a precast formwork characterized by having a hole on a side surface.
6th invention is the precast formwork installed in water, Comprising: Adjacent formwork panels are connected and formed by the said pillar part of the tubular body which has a pillar part and a pile part, The lower end of the said pillar part A precast formwork characterized in that a temporary receiving jig protruding outward from the tubular body is provided in the part.
7th invention is the precast formwork installed in water, Comprising: Adjacent formwork panels are formed by connecting the pillar part of the tubular body having the pillar part and the pile part, and the upper end of the tubular body The precast mold is characterized in that the plate is provided with a dish-shaped portion and a cylindrical portion having a smaller diameter than the dish-shaped portion on the dish-shaped portion.

It is desirable that the skirt member is provided in front Symbol formwork panels.
The formwork panel is preferably a steel plate provided with a reinforcing material .

According to an eighth aspect of the present invention, there is provided a precast formwork formed by connecting adjacent formwork panels to each other by the pillar part of a tubular body having a pillar part and a pile part integrally in the vertical direction, and the pile part is formed in a drilling hole in a water bottom The underwater structure is characterized in that concrete is cast in the precast formwork.
According to a ninth aspect of the present invention, a precast formwork formed by connecting adjacent formwork panels to each other with the pillar part of a tubular body having a pillar part and a pile part inserts the pile part into an excavation hole in a water bottom. The underwater structure is characterized in that concrete is placed in the precast formwork, and the pile portion has a hole on a side surface.
In a tenth aspect of the present invention, a precast formwork formed by connecting adjacent formwork panels to each other with the pillar part of a tubular body having a pillar part and a pile part inserts the pile part into an excavation hole in a water bottom. The underwater structure is characterized in that concrete is placed in the precast formwork, and a temporary receiving jig is provided at the lower end portion of the pillar portion so as to protrude outward from the tubular body. .
In an eleventh aspect of the invention, a precast formwork formed by connecting adjacent formwork panels to each other by the pillar part of a tubular body having a pillar part and a pile part inserts the pile part into an excavation hole in a water bottom. The concrete is placed in the precast formwork, and the upper end portion of the tubular body is provided with a dish-shaped portion and a cylindrical portion having a smaller diameter than the dish-shaped portion on the dish-shaped portion. It is an underwater structure characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, the underwater work can be reduced and the form installation method etc. in which a formwork can become independent easily can be provided.

Diagram showing formwork 1 The figure which shows the receiving part 5c Diagram showing how to install the formwork Diagram showing how to install the formwork Diagram showing how to install the formwork Diagram showing how to install the formwork Diagram showing how to install the formwork The figure which shows the formwork 1a The figure which shows the receptacle 41 Diagram showing how to install the formwork The figure which shows the base 10 Diagram showing tightening of formwork 1

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

(1. Formwork 1)
FIG. 1 shows a mold 1 (precast mold) according to an embodiment of the present invention. FIG. 1A is a view of the side surface of the mold 1, and FIG. 1B is a cross-sectional view taken along line AA in FIG. FIG.1 (c) is the figure which looked at the formwork 1 from the top.

  This formwork 1 is installed in order to construct a pedestal (underwater structure), which is a large-scale concrete structure, on the bottom of the water near the dam body when the dam body is constructed. The above pedestal is used to install a temporary closing structure that closes the construction site of the levee body from the surrounding water area.

  The mold 1 has a U-shaped planar shape, and includes a mold panel 3, a steel pipe pile 5 (tube body), a wire mesh 27, 29 (skirt material), and the like.

  The formwork panel 3 is reinforced by attaching a horizontal steel plate 3a (reinforcing material) to the steel plate 3b. The shape steel 3a is, for example, an H shape steel, but is not limited thereto, and may be, for example, an I shape steel. In the present embodiment, a plurality of formwork panels 3 are arranged in a U-shape. Adjacent formwork panels 3 are connected by a steel pipe pile 5.

  At both ends of the U-shaped plane of the mold 1, the side edges of the mold panel 3 are formed so as to be close to the wall surface of the bank when the mold 1 described later is installed. However, the side edge part of the formwork panel 3 is formed in a straight line shape and does not completely coincide with the unevenness of the wall surface.

  The steel pipe pile 5 is a pipe body which has the column part 5a and the pile part 5b up and down. The formwork panel 3 is connected to the column portion 5a. The tip of the pile portion 5b is pointed, and a hole 15 is provided on the side surface. A temporary receiving jig 17 that protrudes to the outside of the steel pipe pile 5 is provided at the lower end of the column portion 5a.

  A receiving portion 5 c is provided at the upper end portion of the steel pipe pile 5. FIG. 2 is a view showing a cross section of the receiving portion 5c. The receiving part 5 c is provided with a cylindrical part 39 a having a diameter smaller than that of the dished part 39 b and the steel pipe pile 5 on the dished part 39 b having a diameter larger than that of the steel pipe pile 5.

  The metal meshes 27 and 29 are skirt materials provided on the mold 1. The metal mesh 27 is provided at the lower end of the formwork panel 3. The metal mesh 29 is provided at the side end portion of the formwork panel 3 corresponding to both end portions of the U-shaped plane of the formwork 1. For example, a turtle shell metal mesh is used for the metal meshes 27 and 29 and is attached to the inside of the mold 1 in a state of being wound in a roll shape.

(2. Forming method)
Next, the formwork installation method of this embodiment is demonstrated. In the present embodiment, as shown in FIG. 3, first, the excavation hole 9 is excavated in advance at an appropriate position of the bedrock of the bottom 21 near the dam body 2, and the sheath tube 11 is arranged in the excavation hole 9. The plane position of the excavation hole 9 corresponds to the position of each steel pipe pile 5 of the mold 1.

  The sheath tube 11 is a tube body having a hole 13 on the side surface, and the upper end portion protrudes from the water bottom 21. This projecting length is determined according to the state of the bottom of the water bottom 21, and the height of the upper end of each sheath tube 11 is equal, and the height of the upper end of the sheath tube 11 is the lowest at the installation location of the mold 1. 21 is made higher than the high part.

  Next, the formwork 1 formed by assembling the formwork panel 3 and the steel pipe pile 5 with a surface boat or the like is hung by a lifting machine (not shown) such as a crane, and as shown in FIG. Along the bottom 21 is installed.

  When installing the mold 1, the pile portion 5 b of the steel pipe pile 5 is inserted into the sheath pipe 11 in the excavation hole 9, the temporary receiving jig 17 is supported by the sheath pipe 11, the mold 1 is positioned, and is disposed horizontally. To do. As described above, the upper end portion of the sheath tube 11 protrudes from the excavation hole 9 by an amount corresponding to the uneven state of the bottom 21, so that the lower end of the form panel 3 does not hit the bottom 21. 1 can be placed. In addition, when the formwork 1 is suspended, guidance is performed by a diver to align the position of the steel pipe pile 5 with the excavation hole 9, and at this time, in order to improve the visibility of the steel pipe pile 5, the tip of the pile portion 5b is colored with white or the like. You may do it.

  Thereafter, as shown in FIGS. 5A and 5B, the metal net 27 is spread outside the mold 1 by diver work and is arranged in the gap between the mold 1 and the bottom 21. Similarly, the wire mesh 29 is spread outside the formwork 1 and disposed in a gap between the both ends of the U-shaped plane of the formwork 1 and the wall surface of the bank 2. In this way, the gaps between the mold 1 and the installation surface of the mold 1 (the bottom 21 and the wall surface of the bank 2) are closed with the metal meshes 27 and 29.

  Next, a tremy pipe is inserted into the steel pipe pile 5, concrete is injected from the inside of the steel pipe pile 5, the excavation hole 9 is filled, and rooting is performed.

  6A and 6B show a cross section of the excavation hole 9 in the horizontal direction. When the concrete is poured as described above, in the excavation hole 9 shown in FIG. 6A, the concrete exudes to the outside through the hole 15 of the pile portion 5b and the hole 13 of the sheath tube 11, and FIG. 6B. As shown in FIG. 3, the concrete is filled in the excavation hole 9 reliably. This state is shown in FIG. In addition, the diameter of the hole 15 of the pile part 5 b and the hole 13 of the sheath tube 11 is set larger than the maximum aggregate diameter of the concrete 7. The concrete 7 is, for example, underwater non-separable concrete, but is not limited thereto.

  In the present embodiment, after the first-stage mold 1 is installed as described above, the mold 1a (precast mold) shown in FIG. 8 is further stacked thereon. 8A is a view of the side surface of the mold 1a, and FIG. 8B is a view of the mold 1a as viewed from above.

  Although the formwork 1a is formed by the formwork panel 3 and the steel pipe pile 5 similarly to the formwork 1, it differs from the formwork 1 in that the pile portion 5b of the steel pipe pile 5 and the temporary receiving jig 17 are omitted. The lower end part of the steel pipe pile 5 protrudes slightly below the formwork panel 3, and the receiving tool 41 shown in FIG. 9 is provided therein. The receiving tool 41 protrudes inward from the inner surface of the steel pipe pile 5. In the mold 1a, the wire mesh 27 is also omitted.

  The above-mentioned form 1a is also formed in advance on a surface boat or the like, suspended from above the form 1 with a lifting machine (not shown) such as a crane, and the form 1 as shown in FIG. 10 (a). Stack on. In the same manner as described above, the wire mesh 29 is widened to close the gap between the both ends of the U-shaped plane of the mold 1 a and the wall surface of the bank 2.

  At the time of installation of the mold 1a, as shown in FIG. 10 (b), the tubular portion 39a of the receiving portion 5c of the steel pipe pile 5 of the mold 1 is inserted into the lower end of the steel pipe pile 5 of the mold 1a. The support 41 of the pile 5 is supported by the cylindrical portion 39a. The lower end of the steel pipe pile 5 of the formwork 1a is located inside the dish-like portion 39b.

  Next, a grout material 43 such as an underwater inseparable mortar is filled as a filler on the outside of the dish-shaped portion 39b and the cylindrical portion 39a. In this embodiment, the dish-shaped portion 39b is first filled with the grout material 43, and then grouted outside the tubular portion 39a through an openable / closable hole (not shown) provided on the side surface of the steel pipe pile 5 of the mold 1a. The material 43 is filled.

  In the present embodiment, the mold 1a is fixed to the mold 1 as described above. However, the fixing method is not limited to this. For example, instead of the receiving portion 5c of the steel pipe pile 5 of the formwork 1, a flange projecting outward is provided at the upper end of the steel pipe pile 5, and the steel pipe pile 5 is changed to the support 41 of the steel pipe pile 5 of the formwork 1a. A flange is also provided at the lower end of 5 and projects outward. Bolt holes are formed in these flanges. In this case, the formwork 1a can be fixed to the formwork 1 by matching the positions of the bolt holes, overlapping the flanges, and joining the flanges using bolts.

  After the molds 1 and 1a are thus installed, concrete is placed in the molds 1 and 1a. For example, underwater non-separable concrete is used as the concrete, but it is not limited thereto.

  When the concrete is hardened, a pedestal is constructed on the bottom 21. FIG. 11 is a top view of the base 10 constructed by placing concrete 23 in the molds 1 and 1a. In this embodiment, the molds 1 and 1a are not removed, but are embedded molds. If necessary, concrete may be filled in the steel pipe piles 5 of the molds 1, 1a.

  Thus, according to this embodiment, the mold 1 assembled in advance by the mold panel 3 and the steel pipe pile 5 is installed by inserting the pile portion 5b of the steel pipe pile 5 into the excavation hole 9 of the water bottom 21. It is possible to reduce underwater work by divers. The formwork 1 can be firmly assembled by the formwork panel 3 and the steel pipe pile 5, and can be easily made independent by appropriately determining the length of the pile part 5b. Moreover, as the formwork panel 3, the steel plate 3b is used by attaching the form steel 3a which is a reinforcing material, so that the rigidity is high, so that the support work inside the formwork can be omitted, and the concrete inside the formwork can be placed. It becomes easy.

  Moreover, the pile part 5b has the hole 15 on the side surface, and injects concrete from the inside of the steel pipe pile 5 and fills the excavation hole 9 with concrete, thereby solidifying the formwork 1 and allowing it to stand on its own. Can do.

  In addition, when the mold 1 is installed, the temporary receiving jig 17 of the steel pipe pile 5 of the mold 1 is supported by the sheath tube 11 protruding from the water bottom 21, so that the mold 1 can be placed horizontally even if the water bottom 21 is uneven. Can be installed. Further, the excavation hole 9 can be protected by the sheath tube 11 to prevent the excavation hole 9 from collapsing, and the pile portion 5b can be easily inserted.

  In addition, since the gap between the mold 1 and the installation surface is closed by the metal meshes 27 and 29, the mold 1 can follow the unevenness of the installation surface and the concrete can be suitably placed inside the mold. Moreover, since the metal nets 27 and 29 are spread outside the mold 1, there is no cross-sectional defect of the concrete.

  As the skirt material, a geogrid or geotextile made of fibers or the like can be used in place of the wire nets 27 and 29. However, since the metal meshes 27 and 29 have appropriate rigidity, there is an advantage that the installation in the water can be easily performed.

  Furthermore, in this embodiment, the formwork 1a is piled up on the formwork 1, and at this time, the receiving part 41 of the steel pipe pile 5 of the formwork 1a is used as described above, and the tubular portion 39a of the steel pipe pile 5 of the formwork 1 is used. The grout material 43 is filled on the outside of the dish-like portion 39b and the cylindrical portion 39a. In this way, the mold 1a can be stacked and installed according to the required height, and the position of the mold 1a can be easily fixed without requiring high-precision alignment of the mold 1a as in the case of bolting.

  In addition, in this embodiment, although the U-shaped plane formwork 1 was illustrated, the shape of the formwork is not limited to this, and can be appropriately determined according to the shape and installation location of the underwater structure. . Further, the application target of the mold 1 is not limited to when the pedestal 10 is constructed, but can be applied when various underwater structures are constructed. As an example, the present invention can be applied to a case in which concrete is placed at the time of construction such as a pier base at the bottom of a water bottom or a base of a breakwater installed away from the coast.

  Moreover, although the formwork 1 and 1a were piled up in two steps in this embodiment, it does not restrict to this. By sequentially stacking the molds 1a in the same manner as described above, it is possible to stack any number of molds to a required height. Alternatively, a case where only the first-stage formwork 1 is installed is also conceivable. The receiving portion 5c can be omitted for the uppermost formwork.

  Further, as shown in FIG. 12, an anchor 45 is provided on the wall surface of the bank body 2 as required, and an end of a turn buckle 47 (tightening material) connected to the anchor 45 is attached to the mold 1 to form the mold 1 May be fastened to the dam body 2. In the drawing, an example in which the first-stage mold 1 is fastened is shown, but the second-stage and subsequent molds 1a can be fastened in the same manner. Thereby, the horizontal force which acts on a formwork at the time of placement of concrete, etc. can be disperse | distributed, and the dam body 2 can be borne.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1, 1a ......... Formwork 2 ......... Body 3 ......... Formwork panel 3a ......... Steel 3b ......... Steel 5 ......... Pipe pile 5a ......... Column part 5b ......... Pile part 7 ……… Concrete 9 ……… Drilling hole 11 ……… Sheath tube 13, 15 ……… Hole 17 ……… Temporary receiving jig 21 ……… Water bottom 27, 29 ……… Wire mesh

Claims (14)

A precast formwork formed by connecting adjacent formwork panels with the pillar part of the tubular body integrally having a pillar part and a pile part.
A method for installing a form, characterized in that the pile portion is inserted into a drilling hole in the bottom of the water. A precast formwork formed by connecting adjacent formwork panels with the pillar part of the tubular body having a pillar part and a pile part,
Insert and place the pile into the drilling hole in the bottom of the water ,
The pile portion has a hole on a side surface,
A method for installing a form , wherein concrete is poured from the inside of the tubular body, and the concrete is filled into the excavation hole . A temporary receiving jig is provided at the lower end of the column part,
In the excavation hole, a sheath pipe having a hole on a side surface is arranged,
The sheath tube has an upper end protruding from the water bottom,
3. The mold installation method according to claim 2, wherein the pile portion is inserted into the sheath pipe and the temporary receiving jig is supported by the sheath pipe when the precast mold is installed. A skirt material is provided on the formwork panel,
At the time of installation of the precast mold, the mold according to claims 1 to claim 3 in which the gap between the precast mold and the precast formwork installation surface, characterized in that blocked by said skirt member Frame installation method. A precast formwork formed by connecting adjacent formwork panels with the pillar part of the tubular body having a pillar part and a pile part,
Insert and place the pile into the drilling hole in the bottom of the water ,
The upper end of the tubular body is provided with a dish-shaped part and a cylindrical part having a smaller diameter than the dish-shaped part on the dish-shaped part,
On the precast formwork,
A precast formwork formed by connecting adjacent formwork panels to each other with a tubular body having a receptacle inside the lower end,
Supporting the receiver with the tubular part and installing it,
The mold installation method characterized by filling the said plate-shaped part and the outer side of the said cylindrical part with a filler . A precast formwork to be installed in the water,
A precast formwork formed by connecting adjacent formwork panels to each other by the pillar part of a tubular body having a pillar part and a pile part integrally in the vertical direction . A precast formwork to be installed in the water,
It is formed by connecting adjacent formwork panels together with the pillar part of the tubular body having the pillar part and the pile part ,
The said pile part has a hole in a side surface, The precast formwork characterized by the above-mentioned . A precast formwork to be installed in the water,
It is formed by connecting adjacent formwork panels together with the pillar part of the tubular body having the pillar part and the pile part ,
A precast formwork characterized in that a provisional receiving jig protruding outward from the tubular body is provided at a lower end portion of the column portion . A precast formwork to be installed in the water,
It is formed by connecting adjacent formwork panels together with the pillar part of the tubular body having the pillar part and the pile part ,
A precast formwork , wherein an upper end portion of the tubular body is provided with a dish-shaped portion and a cylindrical portion having a smaller diameter than the dish-shaped portion on the dish-shaped portion . The precast formwork according to any one of claims 6 to 9 , wherein a skirt material is provided on the formwork panel. A precast formwork formed by connecting adjacent formwork panels together with the pillar part of a tubular body having a pillar part and a pile part integrated vertically is arranged by inserting the pile part into an excavation hole in the bottom of the water. ,
An underwater structure characterized in that concrete is cast in the precast formwork. A precast formwork formed by connecting adjacent formwork panels with the pillar part of the tubular body having a pillar part and a pile part is arranged by inserting the pile part into a drilling hole in the bottom of the water,
Concrete is cast in the precast formwork ,
The said pile part has a hole in a side surface, The underwater structure characterized by the above-mentioned . A precast formwork formed by connecting adjacent formwork panels with the pillar part of the tubular body having a pillar part and a pile part is arranged by inserting the pile part into a drilling hole in the bottom of the water,
Concrete is cast in the precast formwork ,
An underwater structure characterized in that a temporary receiving jig is provided at the lower end portion of the column portion so as to protrude outward from the tubular body . A precast formwork formed by connecting adjacent formwork panels with the pillar part of the tubular body having a pillar part and a pile part is arranged by inserting the pile part into a drilling hole in the bottom of the water,
Concrete is cast in the precast formwork ,
An underwater structure in which an upper end portion of the tubular body is provided with a dish-shaped portion and a cylindrical portion having a smaller diameter than the dish-shaped portion on the dish-shaped portion .

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