JP2017197957A - Mold system and construction method of concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold system and a construction method of a concrete structure that curtail a construction period and reduce a construction cost.SOLUTION: A construction method includes a preparatory step in which a second sheathing plate 3b is installed continuously above a first sheathing plate 3a fixed on an existing portion, and a concrete casting step in which concrete is cast inside the second sheathing plate 3b. The first sheathing plate 3a is fitted rotatably on an edge part of a connection member 4, and the second sheathing plate 3b is fitted rotatably on the other edge part of the connection member 4. In the preparatory step, the second sheathing plate 3b fixed on the existing portion is removed from the existing portion underneath the first sheathing plate 3a, and then the connection member 4 is rotated around the edge part of the connection member 4 to move the second sheathing plate 3b above the first sheathing plate 3a, and the second sheathing plate 3b is rotated around the other edge part of the connection member 4.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a formwork system and a concrete structure construction method.

A concrete structure such as a concrete dam is constructed by placing concrete in a formwork installed corresponding to the surface of the concrete structure. For example, when forming a dam dam body by CSG (Cemented Sand and Gravel) method, when covering the surface with concrete, install a formwork with a gap from the surface of the trapezoidal main body (CSG) However, concrete is placed in this gap.
When constructing a large concrete structure such as a dam, it is common to lay concrete into multiple layers. In the construction of such a large concrete structure, a slide mold or a precast concrete mold (hereinafter simply referred to as “PC mold”) may be employed.

When using a slide mold, the lower part of the slide mold is fixed to the surface of the existing part of the concrete structure, and the upper part of the slide mold is projected from the upper surface of the existing part. Place concrete in the wall. Then, after curing the concrete, the slide formwork is moved upward to place the next layer of concrete (for example, see Patent Document 1).
When a PC formwork is used, the PC formwork is disposed along with the placement of the concrete. After placing the concrete on the back of the PC formwork, the PC formwork is left as it is for the concrete structure. It is left as a part (for example, refer patent document 2).

JP 05-133097 A JP-A-2005-163283

If the slide form is removed when the concrete is not sufficiently cured, there is a risk that the concrete will be locally damaged by the tensile force at the time of removal. Therefore, when adopting the slide form, it is necessary to secure a sufficient curing time for the concrete, but this hinders the shortening of the construction period.
In addition, when using a PC formwork, it is necessary to use a large number of expensive PC formwork, so that the overall construction cost is higher than when using a formwork. In addition, it takes time to carry and install a PC form made of concrete and heavy in weight.
This invention solves the said problem, and makes it a subject to propose the construction method of a formwork system and a concrete structure which enabled reduction of a work period and reduction of construction cost. .

In order to solve such a problem, the formwork system of the present invention includes a pair of upper and lower slats adjacent to each other and a connecting member that connects the slats to each other. It is characterized in that it is attached to the end of the member so as to be rotatable about the horizontal axis.
According to such a formwork system, since the dam plate is divided into two, it is not necessary to remove the whole formwork when moving the formwork. That is, the next layer of concrete can be placed by removing only the lower slats attached to the sufficiently cured parts and moving them upward. Therefore, it is possible to shorten the period required from concrete placement to the movement of the formwork, and to shorten the construction period. Since the dams are connected to each other via a connecting member, when one dam is removed from the existing part of the concrete structure, a reaction force can be taken from the other dam. Therefore, the burden on the existing part at the time of removing a weir can be reduced.

In addition, when an anchor attachment member is provided in the upper part of the said board, while positioning of an anchor becomes easy, the fixing degree of a board and concrete can be improved via an anchor.
Moreover, if the formwork scaffold which can be attached or detached with respect to the said connection member is provided, the safety | security at the time of mold form fixation and mold form fine adjustment can be ensured. Moreover, workability | operativity can be improved by moving a formwork in the state which removed the formwork scaffold. In addition, cost reduction can be expected by simplifying the configuration of the entire formwork system.

Further, the construction method of the concrete structure of the present invention includes a preparatory step in which a second sill plate is connected to the upper side of the first sill plate fixed to an existing part, and concrete is placed inside the second sill plate. A first placing plate rotatably attached to one end portion of the connecting member, and the second backing plate rotatable to the other end portion of the connecting member. In the preparatory step, after the second slat fixed to the existing part on the lower side of the first slat is removed from the existing part, the one end of the continuous member is centered on the one end. The second slat is moved above the first slat by rotating the connecting member, and the second slat is rotated around the other end of the continuous member.
According to the concrete structure construction method, since the siding plate is divided into two, it is not necessary to remove the entire formwork when moving the formwork. That is, the second layer of concrete can be placed by removing only the second slats attached to the sufficiently cured parts and moving them upward. Therefore, it is possible to shorten the period required from concrete placement to the movement of the formwork, and to shorten the construction period. Further, since the second dam plate is moved while being rotated via the connecting member, positioning is easy. Moreover, the burden on the existing part can be reduced by taking the reaction force from the first dam.

  According to the formwork system and the concrete structure construction method of the present invention, the construction period can be shortened and the construction cost can be shortened for the construction of the large concrete structure.

It is sectional drawing which shows typically the dam bank body which concerns on embodiment of this invention. (A) is a perspective view which shows typically the installation condition of a formwork system, (b) is a perspective view which shows typically the movement condition of a formwork system. It is a side view which shows the formwork system of this embodiment. It is a perspective view which shows the outline | summary of a formwork system. It is a side view which shows a formwork scaffold. It is a side view which shows each process of the construction method of the concrete structure of this embodiment, (a) is a preparatory process, (b) is a placing process. It is a side view which shows the preparation process of the construction method of a concrete structure following FIG.

This embodiment demonstrates the case where the dam body 1 (refer FIG. 1) is constructed | assembled by CSG (Cented Sand and Gravel) construction method. The dam dam body 1 is formed by covering the surface of a trapezoidal CSG (main body part 11) with a concrete part 12.
The concrete part 12 is constructed by placing the formwork system 2 at a predetermined interval from the surface of the main body part 11 (preparation process), and then placing concrete between the formwork system 2 and the main body part 11. (See FIG. 6). As shown in FIG. 2 (a), the concrete placement is divided into a plurality of layers (L1, L2,...), And the concrete placement layer (in FIG. 2 (a), the layers The outer surface of L3) is covered with a plurality of formwork systems 2 (formwork body 21).

As shown in FIG. 3, the formwork system 2 is attached to the connection member 4 and a formwork body 21 including a pair of slat plates 3 and 3 adjacent to each other and a connection member 4 that connects the slat plates 3 to each other. And a formwork scaffold 5. In the present embodiment, for example, one formwork scaffold 5 is used for one surface of the dam dam body 1, and one formwork scaffold 5 is shared by a plurality of formwork bodies 21. The number of formwork scaffolds 5 is not limited.
The dam plate 3 is a plate-like member having a rectangular shape in plan view. The pair of dam plates 3, 3 are formed in the same shape. Although the structure of the weir plate 3 is not limited, the present embodiment includes a weir plate body 31, a reinforcing member 32, a rotating jig 33, an anchor mounting member 34, and a connecting jig 35. . In addition, the structure of the dam plate 3 is not limited. For example, the reinforcing member 32 may be omitted when the dam main body 31 has sufficient strength.

The board main body 31 of this embodiment is a plate-shaped member facing the concrete placing surface, and is formed in a rectangular shape by combining a plurality of steel plates. In addition, the dam board main body 31 may be formed with one board | plate material. Moreover, the material of the board | plate material which comprises the board main body 31 is not limited, For example, a wooden board may be sufficient.
As shown in FIG. 4, the reinforcing member 32 is formed by combining shaped steel materials in a lattice shape, and is fixed to the back surface of the base plate body 31 so that the base plate body 31 is not deformed. . The configuration of the reinforcing member 32 is not limited. Further, the fixing method of the reinforcing member 32 and the board main body 31 may be appropriately selected such as a fixing method using a jig or welding. Moreover, each member which comprises a reinforcing member is not limited, For example, a grooved steel, L-shaped steel, H-shaped steel, etc. may be used.

The rotating jig 33 is a member for connecting the dam plate 3 and the connecting member 4, and is attached to the reinforcing member 32. The rotating jig 33 is provided at the intermediate portion in the vertical direction of the dam plate 3 and holds the connecting member 4 rotatably. The rotating jig 33 may be directly fixed to the dam plate main body 31.
The anchor attachment member 34 is a member that detachably holds the anchor material 6 embedded in the concrete portion 12, and is provided on the top of the dam plate 3. The arrangement and number of anchor attachment members 34 are not limited and may be set as appropriate.
The connecting jig 35 is provided at the upper end and the lower end of the dam plate 3. The connecting jig 35 connects the adjacent board 3 together. The connecting jig 35 of the present embodiment is configured by a plate material screwed to the side surfaces of the upper and lower dam plates 3, 3 (reinforcing members 32, 32). In addition, the structure of the connection jig | tool 35 will not be limited if the board 3 can be fixed.

The connection member 4 connects the slats 3 arranged up and down. That is, one slat 3 (first slat 3a) of the pair of slats 3 and 3 is rotatably attached to one end of the connecting member 4, and the other slat 3 (second The weir plate 3b) is rotatably attached to the other end of the connecting member 4.
As shown in FIG. 4, the connecting member 4 of the present embodiment includes a pair of longitudinal members 41 and 41 and a pair of transverse members 42 and 42. The vertical member 41 is a steel material disposed across the upper and lower weir plates 3 and 3. The cross member 42 is a steel material disposed on the upper and lower ends of the connecting member, and connects the left and right vertical members 41, 41. Both ends and an intermediate portion of the cross member 42 are attached to the rotating jig 33 of the dam plate 3. The connecting member 4 rotates around the cross member 42. The vertical members 41 and 41 and the horizontal members 42 and 42 may be integrally formed, or individual members may be connected to each other.

As shown in FIG. 5, the formwork scaffold 5 includes a support base 51 and a scaffold body 52.
The support frame 51 is formed by combining shape steel materials. Locking members 53 and 53 for locking to the connecting member 4 are fixed to the lower surface of the support frame 51. In the present embodiment, as shown in FIG. 3, the formwork scaffold 5 is installed by locking the locking member 53 to the cross member 42 of the connecting member 4. In addition, the attachment location of the latching member 53 is not limited, For example, you may latch to the reinforcement member 32 of the dam 3. Moreover, the attachment method of the formwork scaffold 5 is not limited, For example, you may attach the board 3 via a jig | tool.
In the present embodiment, the upper and lower two-stage scaffold bodies 52 are provided, but the number of the scaffold bodies 52 is not limited. Reference numeral 54 denotes a handrail.

The construction of the concrete part 12 is performed by repeating the preparation process and the placing process.
In the preparation step, as shown in FIG. 6A, the formwork system 2 is installed at a position spaced from the main body 11 by a predetermined interval (thickness of the concrete portion 12).
The formwork system 2 arranges the first sill plate 3a and the second sill plate 3b vertically, and connects the first sill plate 3a and the second sill plate 3b via a connecting jig 35. The angle of the pair of dam plates 3 and 3 is not limited, but in the present embodiment, the angle is set to 1: 0.8. In the present embodiment, the second slat 3b is fixed to the lowermost concrete layer (existing portion 12a), and the first slat 3a is installed above the second slat 3b. Anchor members 6 and 6 are attached to the anchor attachment members 34 and 34 of the slats 3 and 3, respectively.

In the placing step, as shown in FIG. 6B, concrete is placed between the first slat plate 3a and the main body 11 (inside the sill plate 3).
At this time, the worker rides on the formwork scaffold 5 (see FIG. 3) and appropriately moves the concrete placing pipe so that the concrete spreads over the whole. Further, as the concrete is placed, the concrete is compacted by a vibrator (not shown). Note that the concrete is placed after the joint portion of the existing portion 12a (upper surface of the lowermost concrete layer) is processed. In the placing process, a handrail (not shown) is installed at the height of the top of the concrete before placing the concrete.

After curing the concrete, the preparation process and the placing process are repeated. In addition, construction of the concrete part 12 after the third layer is performed according to the following procedure.
The lower board 3 (second board 3b) fixed to the existing part 12a of the concrete part 12 is removed from the existing part 12a and moved above the upper board 3 (first board 3a). . In this embodiment, as shown in FIG. 7, the 1st wire 71 is attached to the lower end part (one edge part) of the 2nd baffle plate 3b. Next, the formwork scaffold 5 is removed from the connecting member 4. The formwork scaffold 5 is removed by lifting using a lifting machine (not shown) such as a crane. The formwork scaffold 5 removed from the formwork body 21 (for example, the formwork body 21a in FIG. 2A) is the next formwork body 21 (for example, the formwork body on the left side in FIG. 2A). 21b). Then, the 2nd slat 3b is removed from the concrete part 12 by pulling up the 1st wire 71 with lifting machines (not shown), such as a crane. Since the first slat plate 3a is fixed to the existing portion of the concrete portion 12 via the anchor material 6, when the second sill plate 3b is removed, a reaction force is taken from the first sill plate 3a.

When the second slat 3b is moved, the connecting member is centered on one end of the continuous member 4 (the rotating jig 33 of the first slat 3a) while pulling up the lower end of the second slat 3b by a lifting machine. This is done by rotating 4. The second slat 3b is moved above the first slat 3a and rotated around the other end of the continuous member 4 (the rotating jig 33 of the second slat 3b). The rotation of the second weir 3b is performed by attaching the second wire 72 to the other end (lower end) of the second weir 3b, pulling up the second wire 72 and loosening the first wire 71. The rotation of the second sill plate 3b is performed above the first sill plate 3a, and the placement surface of the first sill plate 3a (the contact surface with the concrete portion 12) and the placement surface of the second sill plate 3b. Try to be flush. In addition, the method of removing, moving and rotating the second dam plate 3b is not limited. When the second slat plate 3b is rotated, the first slat plate 3a and the second slat plate 3b are connected via the connecting jig 35.
When the second slat plate 3b and the first slat plate 3a are connected, the scaffold is moved from the former formwork body 21 (for example, the formwork body 21a in FIG. 2B), and the formwork scaffold 5 is moved. It is installed on the mold body 21 (for example, the mold body 21b in FIG. 2B).
When the formwork system 2 is installed at a predetermined position, concrete is placed between the second slat 3b and the main body 11 (placement process).
Thereafter, the preparation step and the placing step are similarly repeated to form the concrete portion 12 having a predetermined height.

  According to the formwork system and the concrete structure construction method of the present embodiment, since the siding plate 3 is divided into two parts, when the formwork system 2 is moved, the entire formwork system 2 is moved to the concrete portion. There is no need to remove the 12 existing parts. That is, the next layer of concrete can be placed by removing only the dam plate (lower dam plate) 3 attached to the sufficiently cured portion and moving it upward. Therefore, it becomes possible to shorten the period required from the concrete placement to the movement of the formwork system 2, and the construction period can be shortened. For example, even if it is necessary to secure a curing period of 4 days from concrete placement to demolding, a sufficient curing period is secured in the lower layer, so the curing period of the upper layer is Even in two days, the lower weir 3 can be moved.

Since the slats 3 are connected to each other via the connecting member 4, a reaction force can be taken from the other slats 3 when one slat 3 is removed from the existing portion of the concrete portion 12. Therefore, the burden on the existing part at the time of removing the dam plate 3 can be reduced.
Moreover, the burden on the concrete part 12 is small compared with the conventional construction method which removes a formwork as a whole by peeling only one of a pair of slats 3 and 3. FIG. For this reason, it is possible to prevent the concrete portion 12 from being damaged, and to perform construction with higher quality.

Moreover, since the anchor attachment member 34 is provided in the upper part of the slat board 3, while positioning the anchor material 6 is easy, the fixing degree of the slat board 3 and the concrete part 12 is improved via the anchor material 6. FIG. Can do.
Moreover, since the formwork scaffold 5 is detachable, the workability can be improved by moving the formwork system 2 with the formwork scaffold 5 removed. Since it is performed with the formwork scaffold 5 attached when placing concrete, safety is ensured. Moreover, since the structure of the whole formwork system 2 is simple, it is cheap.
Moreover, since the scaffold can be arranged only in a necessary part by using the formwork scaffold 5, the cost can be greatly reduced as compared with the case where the scaffold is assembled from the legs of the concrete structure.

The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and the above-described components can be appropriately changed without departing from the spirit of the present invention.
Although the case where a CSG dam is constructed has been described in the above embodiment, a concrete structure to which the formwork system and the concrete structure construction method of the present invention can be applied is not limited to a CSG dam. For example, it can be applied to other large concrete structures such as construction of other concrete dams, slope protection works, retaining walls and the like.

DESCRIPTION OF SYMBOLS 1 Dam dam body 2 Formwork system 21 Formwork main body 3 Pail plate 3a First peg plate 3b Second peg plate 31 Peg plate main body 32 Reinforcement member 33 Rotating jig 34 Anchor attachment member 35 Jig for connection 4 Coupling member 5 type Frame scaffolding

Claims (4)

A pair of upper and lower adjacent slats;
A formwork system comprising a connecting member for connecting the weir plates together,
The formwork system, wherein the weir plate is rotatably attached to an end portion of the connecting member.   The formwork system according to claim 1, wherein an anchor attachment member is provided on an upper portion of the dam plate.   The formwork system according to claim 1 or 2, further comprising a formwork scaffold that can be attached to and detached from the connecting member. A preparatory step of continuously providing a second slat on the upper side of the first slat fixed to the existing part;
A concrete construction method comprising a placing step of placing concrete inside the second dam,
The first slat plate is rotatably attached to one end portion of the connecting member, and the second slat plate is rotatably attached to the other end portion of the connecting member,
In the preparatory step, after the second slat fixed to the existing part on the lower side of the first slat is removed from the existing part, the connecting member is rotated around one end of the continuous member. And moving the second slat above the first slat and rotating the second slat around the other end of the continuous member. Construction method.

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