JPH0718233B2 - Formwork construction method for concrete structures - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing a formwork in a concrete structure.

(Prior Art) Conventionally, in the case of constructing a concrete structure, in the formwork construction, a horizontal movement of the formwork has been performed by various construction methods using rails or the like.

For moving the formwork in the vertical direction, please refer to a. Assemble a large number of small formwork to assemble a formwork of a predetermined size. Pour concrete into the assembled form, c. After the predetermined strength is achieved, dismantle the formwork into pieces, d. Transport the disassembled small formwork to the next assembly place, e. A large number of small molds are combined to form a mold of a specified size.

Repetitive work of the above process is an ordinary formwork.

However, if it is a large-scale construction to some extent, the formwork is enlarged and pulled up by a crane or the like, or the formwork is made of steel and a large-scale device such as a hydraulic jack is used to push up the formwork.

However, in the work such as cranes, an external scaffold is required, the enlargement of the formwork is limited due to the lifting load, this is the most difficult point, and a place where the crane can be set is necessary, The work unit price for cranes, etc., which is restricted by workability such as strong winds, becomes high.

Further, needless to say, the construction work with a large-scale device requires enormous construction cost, is difficult to divert, and is rarely used.

From the above viewpoints, it is the usual practice that construction costs are high for dams, retaining walls, chimneys, bridge piers, and other structures that extend upward.

(Problems to be solved by the invention) Therefore, the present invention eliminates the above-mentioned drawbacks and uses ordinary commercially available materials such as plywood form, steel form, etc., which have been widely used in the past, The diversion of materials and the cost of formwork materials are reduced, and because the construction method is simple, no specialized workers are required, which reduces labor costs, improves workability, and shortens the construction period. A method for constructing a frame is provided.

[Structure of Invention]

(Means for Solving Problems) An embodiment of the present invention will be described below with reference to the drawings.
One or a plurality of columns (2) are provided on the back of the mold (1), the columns and the mold are engaged with each other, and the columns are slidably provided, and the frame (1) is set at a construction site. Then, the concrete (C) is cast, and after the concrete (C) is solid, the (C) formwork (1) is demolded from the concrete and the formwork (1) engaged with the column (2). Is slid upward by power, the mold is set again, and this process is repeated.

In addition, the support pillar (2) is first fixed to the foundation part by the anchor bolts (2c) with the fixing legs (2a), and after the concrete (C) is formed by the formwork (2), the concrete ( Temporarily fix it to the C) with anchor bolts (2c).
A hook-shaped stopper (2
d) is fixed to concrete (C) with anchor bolts (2c).

Further, as an example of the engaging means between the mold (1) and the support (2), as shown in FIG. 4, H steel is used on the support (2) side, and on the form (1) side, A Z-shaped metal fitting (1a) that engages with one surface of the H steel is provided, the mold is movably provided so as to slide in a state of being engaged with a support, and tightening bolts (1b) are provided on both sides of the groove. As a result, the mold frame (1) is more easily demolded than the concrete (C) at the time of demolding. (8) is a scaffold provided on the column.

Further, various moving means of the form (1) and the support (2) are conceivable, and one example thereof is at the upper ends of the support and the form.
Also, provide chain blocks (3a) and (3b) near the strong concrete wall surface and the lower ends of the columns (2), and lift the free formwork (1) with the chain block (3a), or The column (2) is suspended by the chain block (3b).

Further, as shown in FIG. 5, a screw shaft (5) is provided on the column (2) side, a motor (6) is provided on the upper end of the column, and a female screw (7) meshing with the screw shaft (5) is provided. It is installed on the side of the mold (1) and moved,
It may be moved by a hydraulic cylinder (4) as shown. However, it is not limited to these means.

(Operation) Next, the operation of the present invention will be described. First, the work of arranging the construction site is completed [there may be no need of arranging] the form (1) engaged with the columns (2) on both sides. ) Is provided (only one side is shown in FIG. 1), and a separator (spacing holder) is fixed (set) between these molds by a proper number of bolts, and is provided between the molds (1) (1). Concrete (C) is placed on the concrete, and when the concrete shows a predetermined strength, loosen the tightening bolts (1b) attached to the columns and remove from the mold.
With the form frame free of the support, the form (1) is engaged with the support (2) and guided by the support to move upward by a moving means such as a chain block (3a). Then, the formwork is set again.

When moving the support (2) upward, loosen the tightening bolts (1b) while fixing the form (1) to the concrete wall, and free the form (1) and the support (2). The pillar (2) is moved upward and fixed to the concrete wall surface with a bolt or the like at a predetermined position.

The present invention repeats this operation.

(Effects of the Invention) According to the present invention, since the existing formwork can be used, the material cost is low, and the work is easy and simple, no specialized worker is required, and the labor cost is reduced. According to this method, there is no restriction in the horizontal direction, and the columns can be installed as needed to increase the size of the formwork as much as possible, which is extremely useful.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention,
2 (a), (b), (c), (d), (e), and (f) are explanatory views sequentially showing an embodiment of the construction method of the present invention, and FIG.
2 (a) is a partially cutaway front view, FIG. 3 (b) is a partially cutaway front view of FIG. 2 (e), and FIG. 3 (c) is The partially cutaway front view of FIG. 2 (f) and FIG.
FIG. 5 and FIG. 6 are enlarged cross-sectional views of a main part of the present invention, which are partially cutaway side views showing another embodiment of the present invention. 1 …… Form, 1a …… Z type metal fitting, 1b …… Tightening bolt,
2 ... Post, 2a ... Rotatable fixed leg, 3a, 3b ... Chain block, 4 ... Hydraulic cylinder, 5 ... Screw shaft, 6 ... Motor, 7 ... Female screw, 8 ... Scaffold , C …… Concrete,

Claims (4)

[Claims] 1. One or a plurality of Hs on the back of the mold (1)
A support (2) made of steel is provided, and the formwork (1) and the support (2) are provided.
Tightening bolts (1
The form fitted with the Z-shaped metal fitting (1a) having b) is provided slidably with respect to the support, and the form is set by fixing the support to the construction site, and then concrete is poured and concrete is poured. After solidification, loosen the tightening bolts and slide the formwork engaged with the support column upward by power, set the formwork again, and repeat this process, Construction method. 2. The method for constructing a formwork in a concrete structure according to claim 1, wherein the power is a chain block, a hydraulic cylinder or a screw shaft. 3. A method for constructing a formwork for a concrete structure according to claim 1, wherein a rotatable fixing leg (2a) is provided at a lower end portion of the column (2). 4. The method of constructing a formwork for a concrete structure according to claim 1, wherein a scaffold (8) is attached to the support column (2).