JPH0657949A - Construction method of high-rise concrete structure - Google Patents

Abstract

PURPOSE:To make it possible to move and fix forms safely and surely while achieving the movement of the forms at an early time. CONSTITUTION:After reinforcing bars are arranged on concrete 47 molded in advance, an external form 2 and an internal form 3 connected and suspended to an upper hanging base frame 4 are set to the internal and external perimeters thereof to place concrete 47, and reinforcing bars are arranged on the upper part thereof in a state to solidify it to a certain extent displaying required compressive strength. The external form 2 is stripped, and by extending and operating a rising and falling jack 10 suspended from the hanging base frame 4, the external form 2 is raised, upward of the molding concrete 47 to set together with the hanging base frame 4. After that, the internal form 3 is stripped and is raised upward of the molding concrete 47 to set, and after the internal forms 3 and 3' of the external form 2 are fixed to an anchor buried into the molding concrete 47 as a unit in advance and are borne, the operation placing the concrete 47 into the form is repeated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a method for constructing a high-rise concrete structure such as a concrete tower, and in particular, it is carried out by repeatedly placing concrete from the lower layer to the upper layer using a moving form, removing the form and moving the form, and curing. It is related to the construction method.

[0002]

2. Description of the Related Art Conventionally, there is known a method of constructing a concrete structure such as a dam bank by pouring concrete while gradually moving a movable form from a lower layer.

[0003]

In the conventional construction method using a moving mold, the mold is lifted and moved by a jack while applying a reaction force to the anchor embedded in the wall surface of the lower concrete that has just been demolded and has poor curing. Therefore, there is a problem that a large load (shearing force) is applied to concrete with insufficient strength development when the form is moved, and as a result cracks occur in the concrete. Therefore, after sufficiently curing the lower concrete, Although it is possible to move the frame, it is inevitable that the construction period will be delayed due to the delay in moving the form.

[0004]

According to the present invention, an outer mold is obtained by arranging a reinforcing bar 45 on a concrete 47 which has been previously molded, and then connecting the reinforcing bar 45 to an upper and lower suspension frame 4 and suspending the reinforcing bar 45 on the inner and outer peripheral parts thereof. Frames 2 and 2'and inner molds 3 and 3'which face them are set, concrete 47 is placed in the molds, and reinforcing bars are provided above it in a state of being hardened so as to develop a required compressive strength. Four
5, the outer molds 2 and 2 ′ are demolded, and the lifting jack 10 hanging from the suspension frame 4 is extended and operated by using the upper surface of the cast concrete 47 as the reaction base to extend the suspension. The outer formwork 2 and 2 ′ together with the suspension frame 4 are raised and set above the molded concrete 47, and then the inner formwork 3 and 3 ′ are demolded and raised and set above the molded concrete 47. , The outer formwork 2, 2'and the inner formwork 3,
3'is fixed to and supported by an anchor 48 which is embedded in the molded concrete 47 in advance, and then the step of placing the concrete 47 in the mold is repeated and the outer mold 2,
Curing frames 33, 33 'at the lower ends of 2'and the inner molds 3,3',
34, 34 'are connected, and the lower concrete 4 is removed from the mold as the outer molds 2, 2'and the inner molds 3, 3' are raised.
The present invention proposes a construction method for a high-rise concrete structure in which the surface of 7 is covered with curing frames 33, 33 ', 34, 34' for curing.

[0005]

After the outer formwork 2 and 2'and the suspension frame 4 are placed by the elevating jack 10, the placing upper surface of the molded concrete 47 that exhibits early compressive strength is raised as a reaction force base, which is safe and secure. It is possible to surely raise.

Further, the anchor 48 allows the outer formwork 2,
Since the shear strength of the molded concrete 47 is sufficiently developed at the time when the 2'and the inner molds 3,3 'are fixedly supported, the outer molds 2,2' and the inner molds 3,3 'and the suspension are suspended. It is possible to support the underframe 4 safely and reliably.

Further, the outer mold forms 2, 2'and the inner mold forms 3, 3 '
As the outer curing frames 33, 33 'and the inner curing frames 34, 34' connected to the respective lower ends thereof are simultaneously raised as they are raised, the inner and outer surfaces of the demolded lower molded concrete 47 are covered and appropriate It becomes possible to carry out curing.

[0008]

EXAMPLE The method of the present invention will be described below with reference to the main tower A in the form of a tapered wedge with a hollow rectangular cross section in a high-rise hollow concrete tower in which a plurality of horizontal beams B are vertically installed between the left and right main towers A shown in FIG. An example of constructing the concrete structure 1 whose cross-sectional shape is gradually reduced and changed from the lower side to the upper side will be described.

First, as shown in FIGS. 1 to 4, outer molds 2, 2 ′ having four front, rear, left, and right surfaces corresponding to the outer peripheral shape of the lower end of the structure 1 to be constructed, and the inner part of the lower end of the structure 1. Inner molds 3 and 3'having four front, rear, left and right surfaces corresponding to the peripheral shape are prepared, and these molds 2, 2'3, 3'are connected to the suspension frame 4 above and suspended.

As shown in FIGS. 5 to 8, the suspension frame 4 constitutes a fixed frame 7 by connecting beams 6 and 6 parallel to the front and rear between main girders 5 and 5 parallel to the left and right. A machine room 8 equipped with a hydraulic pump, a switchboard, a winch, and the like is installed on the top, and a U-shaped slide frame 9 is attached to the main girders 5 and 5 so as to be slidable in the left-right direction. It is configured to be expandable and contractable so that the planar shape can be changed according to the change in the cross-sectional shape.

A plurality of elevating jacks 10 are attached to the fixed frame 7 and the slide frame 9 at required positions so as to face a portion between the lower outer molds 2 and 2'and the inner molds 3 and 3 '. A hoist 11 for lifting equipment is movably installed.

As shown in FIG. 9, the outer mold frames 2 and 2'are detachably mounted with a plurality of vertically long mold plates 13 on a plurality of horizontal rails 12 arranged vertically, and are mounted on the horizontal rails 12 at right angles. The upper ends of the plurality of suspension members 14 are rotatably pivoted on the suspension frame 4 and are suspended, and a jack 15 for separating and connecting is provided on the mold face side of the lower end thereof substantially perpendicularly to the mold face. The roller 16 is attached to the end of the telescopic rod, and the scaffold frame 17 is provided on the outer surface side.

As shown in FIGS. 6 and 8, the inner mold frames 3 and 3'include a large number of vertically long mold plates 19 on a horizontal crosspiece 18 arranged vertically.
Is detachably attached, and the upper ends of a plurality of suspension members 20 that are orthogonally attached to the horizontal rails 18 are hung on the suspension frame 4 via the hoisting ropes 21. Is equipped with a jack 22 for connecting and disconnecting substantially perpendicularly to the mold surface, a roller 23 is attached to the tip of the telescopic rod, and a horizontal member and a vertical member are pivotally attached to the outer surface side via a hanging rope 24. A scaffolding frame 25 formed so as to be foldable is installed.

Corner molds 26 are pivotally mounted on both sides of the outer mold 2'as shown in FIG.
Thus, the opening / closing operation is performed from the position close to the side edge of the outer mold 2 in the intersecting direction to the outside.

Corner molds 28 are pivotally mounted on both sides of the inner mold 3 ', as shown in FIG.
By this, the opening and closing operations are performed from the position close to the side end of the inner formwork 2 in the intersecting direction to the outside, and the inner formwork 2 and the opposing inner formwork 2 support the support frame 31 with the demolding jacks 30 attached to both ends. Further, a demolding jack 32 is connected between the support frame 31 and the inner frame 3 ′.

The outer mold forms 2, 2'and the inner mold forms 3, 3'include
As shown in FIGS. 1 to 4, each form 2,
Outer curing frame 33,3 which is almost twice as high as 2 ', 3,3'
3'and the inner curing frames 34, 34 'are connected.

Internal and external curing frames 33, 33 ', 34, 34'
As shown in FIGS. 11 and 12, is a plate-like body such as a synthetic resin plate or a synthetic resin sheet that covers the concrete surface formed by the outer molds 2, 2 ′ and the inner molds 3, 3 ′. Rollers 35, 36 for traveling on the surface of the molded concrete are attached to the location, and the outer scaffolding frame 3 is provided on the outer surface side.
A foldable scaffolding frame 38 connected to the scaffolding frame 25 of the inner moldwork 7 and the inner moldwork 3 and 3'is installed, and the outer formwork 2 and 2'at its upper end by suspending members 39 and 40 arranged vertically. And the suspension members 14 and 20 of the inner formwork 3 and 3 '.

The outer curing frame 33 'and the inner curing frame 34' are provided with side frames 41 and 42 on both sides thereof, and the outer curing frame 33 in the intersecting direction via rollers 43 and 44 mounted on the inner surfaces of these frames. Also, the inner curing frame 34 is movably overlaid on the outside of the side end portion thereof.

A structure 1 using the above mold and curing device
In constructing, first, after arranging the reinforcing bar 45 on the foundation of the first molded part at the bottom of the structure 1, the outer molds 2, 2 ′ and the inner molds 3, 3 ′ are provided on the outer peripheral part thereof. , And the outer molds 2, 2'and the inner molds 3, 3'are tightly connected to each other by the separator 46, and the suspension frame 4 above them is used as the suspending member 14 of the outer molds 2, 2'or Support with other supporting materials.

Then, concrete 47 is placed in the mold, and a reinforcing bar 45 is arranged above the concrete 47 in a state of being hardened so as to express a required compressive strength, and then the outer molds 2 and 2'are cornered. By removing the mold by opening the form frame 26, and by extending and retracting the jack 15 for separation and contact, the extendable rod of the elevating jack 10 is extended and operated by using the upper surface of the concrete 47 as the reaction force base. The outer formwork 2, 2'is raised together with the suspension frame 4 via the suspending member 14, and in this state, the separation / contact jack 15 is contracted to set the outer formwork 2, 2 '.

Since the inner formwork 3, 3'has not risen to the facing portion when the outer formwork 2, 2'is set, the work of arranging the reinforcing bar 45 is continued until the inner formwork 3, 3'is raised. Alternatively, other necessary work inside the formwork (such as installation of anchor bolts and inserts) can be performed in a work space with one side open.

In addition, since the compressive strength of concrete generally appears in the early stage of the early stage of hardening as compared with the shear strength after it is poured, the reaction force (compressive force acts on the upper surface of the concrete 47 in the early stage of early stage of hardening. It is possible to raise the suspension base frame 4 and the outer formwork 2, 2'by the lifting jack 10 as shown in FIG.

In addition, the inner molds 2 and 2'are replaced by the corner molds 28.
The mold is released by opening the mold, and the demolding jacks 30 and 32 and the separating / connecting jack 22 are extended to perform demolding, and in that state, the inner formwork 2, 2 ′ is raised via the hoisting cable 21. .

Then, the inner molds 2, 2'are set above the first-stage concrete 47, and the outer molds 2, 2'and the inner molds 3, 3'are tightly connected to each other by the separator 46. After supporting the outer formwork 2, 2 ′ and the inner formwork 3, 3 ′ fixed to an anchor 48 such as an anchor bolt or a nut-like insert embedded in advance at a required position of the one-stage concrete 47, the lifting jack 10 And the concrete 47 is placed in the form.

At the time of supporting the form by the anchor 48, since the shear strength of the concrete 47 is sufficiently developed, the outer forms 2, 2 ', the inner forms 3, 3', and the suspension frame are suspended. 4 can be supported safely and reliably.

Thereafter, similarly to the above, in the state where the second-stage concrete 47 is hardened to the extent that the required compressive strength is exhibited, the reinforcing bar 45 is arranged above the concrete 47, and the outer form 2,
2 ′ is removed from the mold, and the lifting jack 10 is used to suspend the frame 4
At the same time, the outer mold forms 2 and 2'are raised, and the inner mold forms 3 and 3'are further raised in the same manner as above.

As the outer molds 2, 2'and the inner molds 3, 3'are raised above the second-stage concrete 47, as shown in FIGS. The outer curing frames 33, 33 'and the inner curing frames 34, 34' that are connected are simultaneously raised, thereby covering the inner and outer surfaces of the demolded first and second-stage molded concrete 47 to perform proper curing.

Thereafter, as shown in FIGS. 1 to 4, the same steps as described above are sequentially repeated to continuously raise the structure 1 while pulling up the inner and outer molds.

The scaffolding frame 25 of the inner formwork 3 or 3'has a suspension rope 24 pulled and folded so as not to disturb the equipment hoist 11 for carrying the equipment up and down.

On the other hand, in the embodiment of the present invention, the side shape of the structure 1 is gradually tapered from the lower part to the upper part. It is necessary to gradually reduce the frame 3, the outer curing frame 33, the inner curing frame 34, and further the suspension frame 4.

Therefore, with respect to the outer mold form 2 and the inner mold form 3, every time when they are raised by one step, the vertically long mold plate 13 and the mold plate 19 which are second from the one side end are removed one by one, and the blank part thereof is removed. The wedge-shaped template 13 and template 19 at the outermost end are laterally moved, and the horizontal rail 1 exposed by the movement is moved.
2 and the ends of the cross rail 18 are cut.

With respect to the outer curing frame 33 and the inner curing frame 34, the side end portions of the plate-like bodies such as the synthetic resin plate and the synthetic resin sheet, which are the main components, are cut off every time the molds 2 and 3 are raised by one step. To do.

Further, regarding the suspension frame 4, the formwork 2, 3
Every time it is moved up by one step, the U-shaped slide frame 9 is slid to the fixed frame 7 side, and the end of the U-shaped slide frame 9 protruding from the main girder 5 is cut and shortened as it becomes longer.

As the lateral widths of the outer mold 2 and the inner mold 3 are reduced, it is necessary to move the suspending member 14 and the suspending member 20. Therefore, as shown in FIG. A holder 49 that slidably holds the horizontal rail 12 and the horizontal rail 18 is attached to the suspension member 20, and the suspension member 1 is attached as necessary.
4 and the suspension member 20 are moved laterally along the horizontal rail 12 and the horizontal rail 18.

[0035]

As described above, according to the present invention, after the outer mold and the suspension frame are driven by the elevating jack, the casting upper surface of the molded concrete that exhibits early compressive strength is raised as the reaction base. Therefore, it is possible to raise safely and reliably.

At the time when the outer and inner molds are fixedly supported by the anchors, the shear strength of the molded concrete in which the anchors are embedded and fixed is also sufficiently developed, so that the outer and inner molds and the suspension are suspended. It is possible to support the underframe 4 safely and reliably.

Further, as the outer and inner molds are raised, the curing frames connected to the lower ends of the molds are simultaneously raised, so that the inner and outer surfaces of the demolded lower molded concrete are covered to perform proper curing. It becomes possible.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view showing one embodiment of a construction process of the present invention.

FIG. 2 is a partial vertical cross-sectional view showing another aspect of the construction process of the present invention.

FIG. 3 is a partial vertical cross-sectional view showing another aspect of the construction process of the present invention.

FIG. 4 is a partial vertical sectional view showing another embodiment of the construction process of the present invention.

FIG. 5 is a plan view showing a state where a wide portion of a structure is being constructed according to the present invention.

FIG. 6 is a vertical sectional front view showing a state where a wide portion of a structure is being constructed according to the present invention.

FIG. 7 is a plan view showing a state where a narrow portion of a structure is being constructed according to the present invention.

FIG. 8 is a vertical sectional front view showing a state where a narrow portion of a structure is being constructed according to the present invention.

FIG. 9 is a front view of an outer frame used in the present invention.

FIG. 10 is a plan view showing a formwork structure used in the present invention.

FIG. 11 is a side view showing a partial structure of a mold used in the present invention.

FIG. 12 is a plan view of a curing frame used in the present invention.

FIG. 13 is a front view of a curing frame used in the present invention.

FIG. 14 is a perspective view showing an example of a structure constructed according to the present invention.

[Explanation of symbols]

 1 structure 2 outer formwork 2'outer formwork 3 inner formwork 3'inner formwork 4 suspension frame 5 main girder 6 beam 7 fixed frame 8 machine room 9 slide frame 10 lifting jack 11 equipment hoist 12 for hoisting 12 horizontal Crosspiece 13 Template 14 Suspension material 15 Jack for separation and contact 16 Roller 17 Scaffolding frame 18 Horizontal crosspiece 19 Template 20 Suspension material 21 Elevating rope 22 Jack for separation and connection 23 Roller 24 Suspension rope 25 Scaffolding frame 26 Corner formwork 27 Cylinder 28 Corner Formwork 29 Cylinder 30 Demolding Jack 31 Supporting Frame 32 Demolding Jack 33 Outer Curing Frame 33 'Outer Curing Frame 34 Inner Curing Frame 34' Inner Curing Frame 35 Roller 36 Roller 37 Outer Scaffolding Frame 38 Scaffolding Frame 39 Suspension Hanging material 40 Hanging material 41 Side frame 42 Side frame 43 Roller 44 Roller 45 Reinforcing bar 46 Separator 47 Concrete 48 Anchor 49 holder

Claims (2)

[Claims] 1. A rebar is laid on the previously molded concrete, and then an outer form frame connected to an upper suspension underframe and hung on the inner and outer peripheries of the rebar is set, and an inner formwork facing the outer formwork is set. Then, concrete is placed in this formwork, and reinforcing bars are arranged above it in a state of being hardened to develop the required compressive strength, and the outer formwork is demolded to suspend the underframe. An elevating jack hanging down from the molding concrete is extended and actuated using the upper surface of the cast concrete as a reaction force base to raise and set the outer formwork together with the suspension underframe above the formable concrete, and then the inner formwork. The frame is removed from the mold and set up above the molded concrete, and the outer and inner molds are fixed and supported by anchors that are embedded in the molded concrete in advance. Repeat the process of placing concrete Construction method of high-rise concrete structure characterized by re-turning. 2. A curing frame is connected to the lower end of each of the outer and inner molds, and the lower concrete surface removed from the mold as the outer and inner molds rise is covered with the curing frame. The method for constructing a high-rise concrete structure according to claim 1, characterized in that it is cured.