JPH01235774A - Constructing method for tower-formed concrete structure - Google Patents

Abstract

PURPOSE:To construct a tower-formed concrete structure with safety and at high precision, and save labors, by connecting a pair of frames with fitted molds, with a jack, and by pushing out respective other side molds and frames alternately as bearing bodies. CONSTITUTION:On frame sections 7a, 8a, an external mold 1 and an internal mold 4 are respectively fitted, and the external frame 7 and the internal frame 8 of steel frame members 9 assembled in the shape of a tower are connected to each other in a vertically and relatively movable state, with an oil-pressure jack 11 via a rod 10. Then, between the molds 1, 4, concrete C1 is placed, and is hardened to sufficient strength, and after that, the mold 1 is removed and the mold 4 and the frame 8 side are set as bearing bodies, and the frame 7 is pushed out by the oil-pressure jack 11. After that, the mold 4 is removed, and the frame 8 is pushed out in the same manner, and the molds 1, 4 are assembled again, and concrete is placed on the concrete C1, and this work is repeated, and a tower-formed structure is constructed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for constructing tower-shaped concrete structures such as chimneys, bridge piers, concrete columns, etc. using a formwork method.

[Conventional technology]

In the construction of tower-shaped concrete structures such as chimneys and bridge piers, conventional construction methods use plywood or other sheathing boards, pipe materials to reinforce the sheathing boards so that they can withstand the lateral pressure of the concrete, and form ties (products) to tie the pipe materials together. The work involves sequentially assembling formwork made of concrete (names), etc. onto concrete that has been previously cast and cured, and then pouring concrete into the formwork.

[Problem to be solved by the invention]

However, assembling the formwork and removing the formwork after pouring concrete to a high place is difficult work and requires a great deal of labor. The current situation is that frame construction costs account for a very high proportion, and there are also many problems regarding safety and construction accuracy.

In view of such problems, the present invention has developed a tower-shaped concrete 4
It is an object of the present invention to provide a construction method that allows construction of J4 buildings to be carried out safely and accurately, and also to save labor.

[Means to solve the problem]

For this purpose, the construction method of the present invention connects a pair of frames with jacks so that they can move relative to each other in the vertical direction. Attach a formwork consisting of form panels, respectively, use one of the formwork and frame, which has been cast and fixed to the hardened concrete, as a support, and alternately attach the two frames to each other with the jacks. After redoing the two frames, the two formworks attached to the two frames were attached with a separator, and concrete was poured between the two formworks.

[For production]

During construction, after pouring concrete between the inner formwork and the outer formwork, the installation points of both formworks are moved to the L direction, and concrete is poured again, which is repeated. The attachment points of both formworks are moved by alternately raising the frame that fixes both formworks in the -E direction of the previously cast and hardened concrete using jacks. There is no need to add another frame or reassemble the frame.

〔Example〕

Hereinafter, the method of the present invention will be explained based on a preferred embodiment illustrated in the drawings for construction of a concrete square chimney.

In Figures 1 and 2, (1) is a type panel (2) (simplified in the figure) consisting of a weir plate made of plywood, reinforcing pipes, form ties, etc. The outer formwork consists of four sides whose ends are connected at right angles to each other by bolts and nuts (3), (4) is the form panel (
It is an inner formwork consisting of four sides formed by connecting the side ends of form panels (5), (5), .

The outer formwork (1) is provided on the frame portion (7a) at the lower end of the outer frame (7), and the inner formwork (4) is provided on the inner frame (8) so as to be movable relative to the outer frame (7) in the vertical direction. The frame at the bottom (
8a), and both frames (7) and (8) are made of H-shaped steel (simplified in the figure).
It is constructed by assembling steel frames (9) such as in the shape of a turret.

The upper end beam part (8b) and the lower end beam part (8c) of the inner frame (8)
) is a rod (10) with a threaded groove formed on its outer circumferential surface.
is fixed in the vertical direction, and the outer frame (7)
A hydraulic jack (11), into which the rod (10) is inserted, is fixed to the upper end beam (7b) via a pedestal beam (7c). The hydraulic jack (11) will later be replaced by the fourth
As detailed in Figures and Figure 5, the rod (
10) is penetrated through the inner and outer drive portions (12a).
(12b), an L arm chair (13a) fixed to the inner drive part (12a) and penetrated by the rod (lO), and an outer drive part (+
2b) and the lower lamb chair (13b) which is interposed and fixed between the pedestal beam (7C) of the outer frame (7) and has the rod (10) passed through it, and the E section arm chair (13&).
an upper nut (1) located inside and screwed with the rod (10);
4a) and the lower neck (+4b) located in the lower ram chair (+3b) and similarly screwed together with the rod (10).
It consists of

Next, to explain the construction procedure in this example step by step, Fig. 1 shows concrete (c) that has been poured and cured and is placed facing each other with a required number of separators (15). A concrete pump (not shown) pumps concrete (
The state in which C1) has been poured is shown. Then, as shown in Figure 3 (A), this poured concrete (CI
) After the concrete (CI) has hardened to sufficient strength, the separator (15) is removed and each mold panel (2H2), φ, is removed from the mold, and the outer frame (7) is lifted up using hydraulic jacks.

Here, the operation of the hydraulic jack (11) at this time will be described in detail. First, in the 41st ffl (A), the hydraulic jack (11) moves its arm chair (+3a)
and the upper arm (+3b) screwed together with the rod (1o) (14a) and the lower nut (14b)
) - H, and the jack body (12) is extended (
The inner periphery drive portion (12a) is in a state of protruding from the outer periphery drive portion (12b). Next, when the jack main body (12) is operated in the direction of shortening (storing the inner circumference drive part (12a) into the outer circumference drive part (12b)) by hydraulic pressure, at this time, the The arm chair (+3a) has a rod (1) connected to the inner formwork (4) which is fixed to the concrete (Cal).
0) through the upper nut (14a), so it is in a non-movable state, while the outer peripheral drive part (+2b) and -
The outer frame (7) is connected to the lower part of the body (13b).
) (Pedestal beam (7c)) is in a free state with respect to the concrete (CI), and the lower nut (14b) does not restrict the northward movement of the lower ram chair (13b), so the jack body ( 12), the lower ram chair (13b) and the outer frame (7) are
As shown in Figure (B), only the stroke acid of the outer peripheral drive portion (12b) increases. Then, as shown in FIG. 4(C), by rotating the lower nut (14b) and moving it upward, the lower ram tie 7 (
+3b) and move the jack main body (12) in the direction of extension. At this time, the upper nut (1
4a) is not regulated in any way, so the
13a) rises by its stroke 1 together with the inner peripheral drive part (12a).

Furthermore, by rotating the upper nut (14a) and moving it upward, the upper ram chair (13a) is supported by the upper nut (14a), and the series of operations from FIG. 4(A) are carried out. Repeat again.

With this, the outer frame (7) is made of concrete (
CI), it is supported by the inner formwork (4) and inner frame (8) side that are in a fixed state and becomes steeper, and as shown in Fig. 3 CB
), the frame portion (7a) of this outer frame (7)
When the lower end of the concrete (CN) reaches the upper end of the concrete (CN), the operation of the hydraulic jack (II) is stopped, and the outer formwork (CN) is stopped.
1) Fix the lower end of the concrete (II; ILh) with a separator (+5) (see Figure 1).

In this state, next each mold panel (5) of inner mold # (4)
(5) Concrete O) (Remove from (:I),
The inner frame (8) is raised by the hydraulic jack (11).

Here, the operation of the hydraulic jack (11) at this time will be described in detail. First, in FIG. 5(A), the jack body (12) of the hydraulic jack (11) is in a shortened state, and the inner formwork (4) Concrete (CI) by demolding
Free letter against! The inner frame (8), which has become a frame, has a rod (10) and an upper nut (14
It is suspended and supported by the E part arm chair (+3&) and lower arm chair (13b) of the hydraulic jack (11) via the lower arm (14b). Next, when the jack main body (12) is moved in the extending direction by hydraulic pressure, as shown in FIG. The rod (10) is pushed up by the inner circumferential drive part (12a) and the arm chair (13a) integrated therewith, and the lower tors (14b) are also pushed up by the inner circumferential drive part (12a). The stroke will only rise. Then, as shown in FIG. 5(C), by rotating and moving the lower nut (14b) downward, the lower nut (14b) is brought into pressure contact with the lower end surface of the lower ram chair (13b) again, and the jack When the main body (12) is moved in the direction of shortening, the one-port 7-door (10) is supported by the lower ram chair (13b), and the upper ram chair (13a) is supported by the E-nut (
14a) and descend together with the inner circumferential drive section (12a). Furthermore, (14a) is rotated and moved downward, and the series of operations from FIG. 5(A) are repeated again.

As a result, the inner frame (8) is made of concrete (CI).
) is supported by the outer formwork (1) and outer frame (7) side which are in a fixed state, and the 311th
As shown in (C), when the frame portion (8a) at the lower end of the inner frame (8) reaches a position corresponding to the outer formwork (1), the operation of the hydraulic jack (11) is stopped; Inner formwork (4
) is fixed to the upper end of the concrete (CI) with a separator (+5) (see Figure 1), and the outer formwork (
1).

In this way, concrete (C2) is poured between the formworks (1) and (4) which are fixed to face each other on the concrete (CI). ) The chimney is formed as a whole by repeating a series of operations.

In the above embodiment, the outer frame (7) is first raised and then the inner frame (8) is explained as a serpentine toy, but the inner frame (8) may be raised first.

〔Effect of the invention〕

According to the method of the present invention, the frame of the outer formwork has the inner formwork side
The frames of the inner formwork use the outer formwork sides as supports, and both frames are raised alternately using a jar. As the formwork assembly point is moved to a higher location, there is no need to reintroduce the frame, making work such as assembling and demolding the formwork much easier than before. It has excellent effects such as saving labor and improving safety and construction accuracy.

[Brief explanation of the drawing]

Fig. 1 is a schematic front cross-sectional view of the installation used in the method of one embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is an explanatory diagram showing the construction procedure, and Fig. 4 Figure and fJIj5
The figure is an explanatory diagram showing the operating procedure of the jack. (1) Outer formwork (2) (5) Mold panel (4) Inner formwork (7) Outer frame (8) Inner frame (10) Rod (11) Hydraulic jack (15) Separator (
C) (C1) (C2) Concrete patent applicant 7″
Ri Kogyo Co., Ltd. - Agent Patent Attorney Nogi
Yogu-, IJfIT! Na

Claims (1)

[Claims] 1. Connect a pair of frames with a jack so that they can move relative to each other in the vertical direction, and attach a formwork consisting of a plurality of mold panels to one of the frames, and a formwork consisting of a plurality of mold panels to the other frame. , Using one of the formwork and frame fixed to the concrete that has been cast and hardened first as a support, both frames are raised alternately with the jack, and both formwork are separated using a separator. A method for constructing a tower-shaped concrete structure, which is characterized by installing and pouring concrete.