JP2980020B2 - Push-up type self-climbing device for tower structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-up type self-climbing apparatus used for construction of a tall tower structure made of concrete, such as a main tower of a PC stayed bridge and a high-rise pillar structure.

[0002]

2. Description of the Related Art A self-climbing apparatus is an apparatus for constructing a structure from a lower part to an upper part by self-elevating a formwork and a scaffold along a lower structure that has been already installed and placing concrete. Conventionally, various self-climbing devices have been used, and various lifting mechanisms have been employed. This lifting mechanism is roughly classified into a suspension system and a lifting system.

FIG. 7 shows an example of a suspension type self-climbing device in a main tower of a cable-stayed bridge or the like, in which an elevating frame 50 can be moved up and down via a guide rail 51 on a concrete structure A already constructed. The stage 52 for elevating operation is attached to the steel frame B 'assembled in advance,
The lifting frame 50 is raised by the center hole jack 53 and the high-strength rebar (Gevin Destab [trade name]) 54. The formwork 55 is suspended from the form suspension frame 56 of the elevating frame 50 via a chain block 57. The jack stroke of the center hole jack 52 is about 0.5 m. The high-strength rebar 54 is alternately gripped by the upper clamp and the lower clamp, and the jack stroke is repeated many times, whereby the lifting frame 50 is lifted by one lift. Let me.

[0004] Fig. 8 shows an example of a push-up type self-climbing device, in which an inner frame 60 and an outer frame 61 are supported on a concrete structure A which has already been constructed so as to be able to move up and down via suspension shoes 62. With the frame 60 fixed, the outer frame 61 having the mold 63 and the scaffold 64 is raised by the electric motor 65 and the rack 66. Next, the outer frame 61 is fixed, and the inner frame 6 is fixed.
Increase 0. The elevating stroke by the electric motor and the rack is about 1.75 m, and the outer frame 61 is lifted by one lift by repeating the ascent of the inner frame 60 and the outer frame 61 alternately.

[0005]

In the self-climbing apparatus, the following points are important points for efficiently performing a lifting operation. That is, there is a difference in working efficiency between simultaneous elevation of each surface and individual elevation of each surface unit. Depending on the height that can be raised and lowered in one time, it is necessary to change the height when going up and down,
There is a difference in work efficiency.

[0006] In the above-mentioned lifting method, although simultaneous lifting and lowering of each surface is common, a stage for raising and lowering operation is required at a position higher than the body of the self-climbing device. There is also a problem.
The push-up method described above does not require an upper stage,
Although labor and safety are improved, an electric motor, a hydraulic jack or the like is a driving source, and a single up-and-down stroke is short. In addition, each surface is moved up and down for each unit.
In addition, both types are capable of moving up and down integrally with the formwork,
There are some which cannot be lifted and lowered by separate means.

As described above, the conventional self-climbing apparatus cannot satisfy all the following conditions. Raise and lower each surface at the same time. The lifting and lowering of 4 m or more is performed by one operation. Does not require an upper stage. The mold can be raised and lowered at the same time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to efficiently and safely perform a single operation without changing the elevation of a push-up type self-climbing device of 4 m or more. Another object of the present invention is to provide a push-up type self-climbing apparatus for a tower-like structure capable of simultaneously moving up and down on each surface and simultaneously moving up and down the formwork.

[0009]

In order to achieve the above-mentioned object, according to the present invention, an upper elevating scaffolding part and a lower elevating operation part are provided, one of which is fixed to an already constructed concrete structure while the other is fixed. In a push-up type self-climbing device that builds a tower-like structure from bottom to top by alternately repeating the raising process, the lifting operation unit includes:
A lifting actuator (such as a hydraulic jack), a moving pulley that moves up and down by the raising and lowering actuator, and a power transmission cable (chain or wire) that is wound around the moving pulley and the fixed pulley and connects the lifting operation unit and the lifting scaffolding unit. A double-stroke elevating mechanism consisting of a rope, etc.).

[0010] Further, a double-stroke elevating mechanism of the elevating operation part is provided so as to avoid an obstacle position of the concrete structure.
The work scaffold at the obstacle position in the elevating scaffold portion can be retracted with respect to the obstacle (opening / closing type, telescopic type, etc.).

In the above construction, if the lifting operation unit is fixed to the concrete structure and the moving pulley is pushed up by the lifting actuator, the lifting scaffold is pulled up by the power transmission cable, and the moving pulley is driven by the principle of the moving pulley. A large climbing stroke can be obtained with a small lifting stroke.
Because it is possible to move up and down a large stroke without changing
The lifting time for one lift can be greatly reduced, and since the lifting type is used instead of the lifting type, and the lifting stroke is short, a safe lifting operation can be performed.

[0012] Further, since the structure comprises an upper elevating scaffold and a lower elevating operation part, and the elevating scaffold is raised and lowered by a double-stroke elevating mechanism provided in the elevating operation part, each surface can be simultaneously elevated and lowered. At the same time, the formwork on each surface can be raised and lowered at the same time. Furthermore, by arranging the lifting and lowering operation unit so as to avoid the obstacle position, and by opening and closing the work platform of the lifting and lowering scaffolding unit, it is possible to lift and lower while avoiding obstacles. Each surface can be raised and lowered at the same time.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. This is an example in which the present invention is applied to an inverted Y-shaped main tower of a PC cable-stayed bridge. FIGS. 1 to 3 show a push-up type self-climbing device according to the present invention, and FIGS. 2 shows a double stroke lifting mechanism. FIG. 6 shows the openable lifting platform.

As shown in FIGS. 1 to 3, the push-up type self-climbing device according to the present invention is roughly divided into an upper lifting platform 1 and a lower lifting operating unit 2, and the lifting operating unit 2 is provided.
Is fixed to the already constructed concrete structure A, the elevating and lowering scaffold 1 is raised by a predetermined stroke, and then, the construction of the steel frame and the rebar and the casting of the concrete are performed.
With the elevating scaffold 1 fixed to the concrete structure A, the elevating operation unit 2 is raised by a predetermined stroke, and this process is sequentially repeated to build the concrete structure from bottom to top. In addition, the self-climbing device can be lowered by the reverse procedure.

The elevating scaffold 1 is mainly composed of an elevating frame 10 having a shape surrounding the four sides of the concrete structure A, and a plurality of square frame-shaped stages 11 surrounding the concrete structure A in plan view. . This stage 11
Consists of an ascending and descending operation stage 11-1, formwork assembling stages 11-2 and 11-3, and reinforcing bar assembling stages 11-4 and 11-5 in order from the bottom.
Each of them is attached to the lifting frame 10 so as to be shifted according to the inclination of the concrete structure A. The formwork 3 is mounted in an intermediate portion of the lifting frame 10. For the concrete structure A, the lifting frame 1
The horizontal member 10a can be fixed detachably.

As shown in FIGS. 2 and 4, the lifting operation section 2 mainly includes a double-stroke lifting mechanism 20, a fixing section 21 detachably fixed to the concrete structure A, a guide member 22, Two surfaces (bridge axis direction) which are constituted by two stages 23 and do not interfere with obstacles such as diagonal members of the concrete structure A and steel beams (arranged in the direction orthogonal to the bridge axis direction in this embodiment) ). Guide member 2
Reference numeral 2 denotes a member that guides and supports the elevating scaffolding portion 1 so as to be able to ascend and descend, and a pair of guide rollers (wheels) 12 that roll with the guide member 22 sandwiched from both left and right sides at the position of the lower horizontal member 10 a of the elevating frame 10. Are arranged vertically.

From the upper end of the guide member 22, a high-strength screw rebar (Gevin disturb) 24 protrudes upward by a predetermined length.
By attaching a nut member to the nut, it is a safety device when ascending and descending. That is, the nut member is provided on the upper horizontal member 10a of the elevating and lowering scaffolding section 1, and when the hydraulic device described later fails, the elevating and lowering scaffolding section 1 and the ascending and descending operating section 2 are moved.
To prevent falling.

As shown in FIG. 4, the double-stroke elevating mechanism 20 has a hydraulic jack 30 as an elevating actuator.
A hydraulic pulley 31 attached to the tip of a piston rod of the hydraulic jack 30, a plurality of constant pulleys 32, and a power transmission chain 33. The fixed pulley includes a fixed pulley 32-1 disposed at the upper end of the guide member 22 and a pair of fixed pulleys 32-2 and 32-3 installed on the lower stage 23.
Consists of The chain 33 has its tip fixed to the lower part of the elevating frame 10, that is, the lower horizontal member 10a.
After winding around the fixed pulley 32-2, the moving pulley 31, and the constant pulley 32-3, the base end is fixed to the tip of the piston rod of the hydraulic jack 30.

Therefore, when the hydraulic jack 30 is extended to raise the moving pulley 31, the tip of the chain 33 is pulled, and the lifting frame 10 is raised. If the stroke of the hydraulic jack 30 is L, the lifting frame 10 It rises with a 3L stroke. When a climbing stroke of 4 m is obtained, the jack stroke may be 1.34 m. However, the hydraulic jack 30 has a weight W of 3
Double the load. The tip of the piston rod of the hydraulic jack 30 is guided and supported by an appropriate pair of guides 34.
Further, as shown in FIG. 5, the chain and the pulley group are arranged in a double manner.

Although a case where a triple climbing stroke is obtained has been described above, it is needless to say that a multiple stroke other than this can be obtained. Although the lifting actuator uses a hydraulic jack having a large lifting capacity, other power can be used. Although a chain is used as the power transmission means, a wire rope or the like may be used.

When raising and lowering the operation unit 2 with respect to the lifting and lowering scaffold unit 1 which has been lifted by one lift, the lifting and lowering scaffold unit 1 is fixed to the concrete structure A so that the lifting and lowering scaffold unit 2 is not lowered. Chain 4 with chain block 41
The lifting operation unit 2 is returned to the original state in FIG. 1 by releasing the fixation of the lifting scaffold 2 in a state where it is supported by 0 and contracting the hydraulic jack 30 in the extended state. Alternatively, the chain 40 is wound up by the chain block 41 to raise the elevating operation unit 2. The guide member 22 of the lifting operation unit 2 is guided and supported by the guide roller 12 of the lifting scaffold unit 1 and moves up. It is needless to say that the raising and lowering operation unit 2 is not limited to this, and other raising and lowering means can be adopted.

Further, when the self-climbing device is lowered for painting or the like after the completion of the construction of the concrete structure, the lifting and lowering scaffolding unit 1 and the lifting and lowering operation unit 2 are alternately moved by one lift as described above. By lowering,
It can be done easily.

Next, each stage 11 of the lifting and lowering scaffold unit 1
As shown in FIG. 6, an opening 11a is provided in a portion of the concrete structure A which interferes with an obstacle such as a diagonal member or a steel beam.
b is attached as a pair. In addition, this openable scaffold 11b
May be a telescopic system or the like. The horizontal member of the lifting frame 10 is also formed in a wedge shape so that the central portion 10b can be fitted from above, and can be detached.

In the above configuration, the operation is as follows.

(1) In FIG. 1, a lifting scaffold 1 and a lifting operation unit 2 are fixed to a concrete structure A.
When the cast concrete C has a predetermined strength, the lifting scaffolding part 1 is released, and the hydraulic jacks 30 arranged on the two surfaces of the concrete structure A are operated in synchronization to raise the moving pulley 31 by the stroke L. Let it. The ascending / descending scaffolding part 1 rises at a stretch by 3 L using the guide member 22 of the ascending / descending operation part 2 as a guide.

(2) As shown in FIG.
To the concrete structure A, assembling the steel frame and the rebar and placing the concrete by the formwork 3, and raising and lowering the operating unit 2 by the stroke 3 L by contracting the hydraulic jack 30 and winding up the chain 40. The elevating operation unit 2 is incorporated in the lower part of the unit 1 to obtain a state similar to that of FIG.

(3) Hereinafter, the steps (1) and (2) are repeated in order to construct the concrete structure A from bottom to top.

(4) When lowering the self-climbing device, as shown in FIG. 6, the openable scaffold 11b is opened upward, and the central portion 10b of the horizontal frame of the elevating frame is removed. An opening 11a is formed in which an obstacle such as an installed diagonal member or a steel beam can be located so that the elevating scaffold 1 can descend without interfering with the obstacle.

Although an example in which the present invention is applied to an inclined main tower of a cable-stayed bridge has been described above, it goes without saying that the present invention is not limited to this and can be applied to the construction of other tower-like structures. Further, even when the concrete structure has a hollow section, it is possible to dispose the above-described elevating scaffold and the elevating operation part inside and outside. Furthermore, even in the case of a variable cross section in which the cross-sectional area changes in the height direction, adaptation is possible by adding a mechanism that can expand and contract the scaffold and the formwork supporting device.

[0030]

Since the present invention has the above configuration, the following effects can be obtained.

(1) The double-stroke elevating mechanism makes it possible to ascend or descend 4 m or more in a single operation without changing the arrangement in a push-up manner, greatly reducing the elevating time for one lift as compared with the conventional type. And high-rise concrete column structures and the like can be constructed efficiently.

(2) It is possible to perform high lifting and lowering with a short stroke of the jack, and to perform lifting and lowering work safely.
It is possible to improve construction safety in a high-rise concrete column structure or the like.

(3) Since it is of the push-up type, there is no need for prior construction of a steel frame or the like as in the case of the lifting type, work is saved, and safety is high.

(4) The structure is composed of an upper elevating and lowering scaffold and a lower elevating and lowering operating part, and the double-stroke elevating mechanism provided on the elevating and operating part raises and lowers the elevating and lowering scaffold. Can be raised and lowered at the same time, and the lifting time can be further reduced.

(5) Ascent and descent can be performed by the same operation.

(6) The lifting / lowering operation unit is arranged so as to avoid the obstacle position, and the work platform of the lifting / lowering scaffold unit is opened and closed. The part can be raised and lowered simultaneously on each side.

(7) It is necessary to improve transportation means in the future due to factors such as overcrowding and depopulation of roads and speeding up of transportation means. However, the relationship with natural destruction is also important. It is thought that the need for the remaining construction means is also high, and it is inevitable that the pillar structures such as piers will be raised. Such a high-rise concrete column structure or the like can be efficiently and safely constructed, which is extremely effective for construction of a high-rise concrete column structure or the like.

[Brief description of the drawings]

FIG. 1 is a front view of a push-up type self-climbing device according to the present invention in a state before an elevating scaffold is raised.

FIG. 2 is a front view of the push-up type self-climbing device according to the present invention, showing a state after the elevating scaffold has been lifted.

FIG. 3 is a plan view of the push-up type self-climbing device of FIG. 1;

4A and 4B show a double-stroke elevating mechanism of the elevating operation unit according to the present invention, wherein FIG. 4A is a side view and FIG. 4B is a plan view.

FIG. 5 is a front view of the double-stroke elevating mechanism of FIG. 4;

FIG. 6 is an opening / closing elevating scaffold according to the present invention;
(A) is a plan view and (b) is a front view.

7 (a) is a plan view, FIG. 7 (b) is a front view before ascending, and FIG. 7 (c) is a conventional hanging type self-climbing device.
Is a front view after ascending.

8 (a) is a plan view, FIG. 8 (b) is a side view before and after ascending, and FIG. 8 (c) is a front view before and after ascending.

[Explanation of symbols]

 A: Concrete structure B: Steel frame C: Concrete 1 ... Elevating scaffold part 2 ... Elevating operation part 3 ... Formwork 10 ... Elevating frame 11 ... Stage 11a ... Opening 11b ... Openable scaffold 12 ... Guide roller 20 ... Double stroke elevating mechanism DESCRIPTION OF SYMBOLS 21 ... Fixed part 22 ... Guide member 23 ... Stage 24 ... High strength screw rebar 30 ... Hydraulic jack 31 ... Moving pulley 32 ... Constant pulley 33 ... Chain 34 ... Guide 40 ... Chain 41 ... Chain block

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masafumi Naito 1-35-1 Awaza, Nishi-ku, Osaka-shi, Osaka Kashima Construction Co., Ltd. Kansai Branch (56) References JP-A-7-82883 (JP, A) JP-A-7-259333 (JP, A) JP-A-7-317315 (JP, A) JP-A-3-125754 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E01D 21 / 00 E04G 3/00

Claims (2)

(57) [Claims] 1. A tower-like structure comprising an upper elevating scaffold part and a lower elevating operation part, wherein one of them is fixed to a concrete structure which has already been constructed and the other is raised alternately so that the tower-like structure is moved from below. In the push-up type self-climbing device constructed upward, the lifting operation unit includes a lifting actuator, a moving pulley that moves up and down by the lifting actuator, a moving pulley and a constant pulley, the lifting operation unit being wound around the lifting pulley, and a lifting scaffold. A self-climbing device for lifting a tower-like structure, characterized in that a double-stroke elevating mechanism comprising a power transmission cable body for connecting a section and a power transmission line is provided. 2. The push-up type self-climbing device according to claim 1, wherein a double-stroke elevating mechanism of the elevating operation unit is disposed so as to avoid an obstacle position of the concrete structure, and works at an obstacle position on the elevating scaffold unit. A self-climbing device for lifting a tower-like structure, wherein the scaffold can be retracted from an obstacle.