JP2521455B2 - Construction method for tower structures - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for constructing a tower-like structure, and in particular, a divided block of the tower-like structure is hoisted by hoisting means to sequentially construct the tower-like structure. It is related to the construction method of erection upwards.

(Prior art) Many tower-shaped structures such as the main tower of long suspension bridges are 100m to 300m above the ground or at sea level, and a divided block (weight of about 70 to 100t) of the main tower is hoisted by a jib crane or winch. As a erection method in which the main towers are sequentially erected upwards, conventionally, a jib crane or the like is generally provided on the top of the main tower during the erection, and the jib crane can be lifted by a lifting device according to the extension of the main tower. The construction method is adopted in which the wire of this jib crane is extended to the ground, the divided block is hung by the hook at the lower end of the wire, and the divided block is hung by the jib crane (for example, JP-A-56-1190).
80, JP-A-53-89157).

On the other hand, in addition to the construction method using the jib crane, a hoisting winch is provided on the ground, and the wire of the hoisting winch is extended to the top of the main tower in the process of being erected, and the wire is extended to the ground through the sheave at the top, There is also a conceivable construction method in which the divided block is hung by the hook of this wire, the divided block is hung up near the top of the main tower by the hoisting winch, and then the divided block is hung by a jib crane and mounted.

In the above-mentioned construction method, the divided blocks are hoisted by the wire of a jib crane or hoisting winch.

(Problems to be solved by the invention) When the height of the main tower reaches 200 to 300 m, it takes one hour or more for one way to hoist the divided blocks from the ground to the mounting location. If the wind becomes violent on the way, the divided block suspended by the wire will start to oscillate greatly, and it is almost impossible to physically stop the oscillating, which may cause an excessive load on the crane. Not only does it become a state, but when the divided block collides with the main tower, problems such as damage to the divided block and the main tower and damage to the scaffolding for construction occur.

In order to avoid the above problems, the erection work must be stopped even with a slight wind, which increases the idle rate of equipment and personnel, prolongs the construction period, and consequently increases the erection work cost.

Here, when the divided block is hoisted by the winch provided on the ground side, a method of directly connecting the wire of the winch to the hoisting piece of the divided block and hoisting is usually adopted. In this case, only a winch is applied instead of the crane, a crane or the like for handling the divided blocks is required near the tower-like structure, and the number of hanging pieces of the divided blocks is increased.

(Means for Solving the Problems) The method for constructing a tower-like structure according to the present invention is constructed by hoisting the divided blocks of the tower-like structure by hoisting means, and sequentially arranging the tower-like structures upward. In the erection construction method, a guide member extending in the up-down direction on one side surface of the existing erected portion of the tower-like structure,
A guided member which is vertically guided by the guide member and is movable along the one side surface, an elevating table which is releasably connected to the guided member and which is vertically moved together with the guided member, and a ground side member. A winch is provided in advance for raising and lowering the lifting table and the guided member via a wire, and a divided block is placed on the lifting table on the ground side, and the lifting member is vertically moved through the guided member by the guide member. While guiding along the above-mentioned one side, hoist the lifting platform with the divided blocks to near the top of the tower structure, and then pass the divided blocks to the crane installed on the top side of the tower structure. It is characterized in that a divided block is loaded by the crane.

(Operation) In the method for constructing a tower-like structure according to the present invention, a guide member guides the lifting platform in the vertical direction and along the one side surface while mounting a divided block. Since it is hoisted up to near the top of the tower-like structure with a winch, even if a considerable amount of wind blows when hoisting the divided block, the divided block does not rock and the divided block can be hoisted securely and safely. . Also,
Since the lifting platform is coupled to the guided member in a releasable manner, the lifting platform can be used for transporting the divided blocks on the ground.

(Effect of the Invention) According to the method for constructing a tower-like structure according to the present invention, as described above, while guiding the lifting platform from the guide member via the guided member, that is, the divided block does not swing. The vertical block is guided along one side of the existing part of the tower-like structure, and the lifting platform with the divided blocks is hoisted, so that the divided blocks can be safely and safely hoisted even in a windy environment. You can

Therefore, it is possible to safely carry out the erection work, prevent damage to the divided blocks and tower-like structures due to rocking of the divided blocks, damage to the scaffolding, etc., and improve the operating rate of equipment and personnel. Can be shortened.

Moreover, since the divided blocks are hoisted by the winch provided on the ground side, the load on the crane placed at the top of the tower structure can be reduced, and the hoisting wire can be short, so the crane can be made smaller and lighter. You can

Furthermore, since the lifting platform is connected to the guided member in a decoupling manner, the lifting platform can be used for transporting the divided blocks on the ground, and the divided blocks can be lifted via the lifting platform so that the divided blocks can be suspended. The number of hanging pieces can be reduced.

(Example) Hereinafter, an example in which the present invention is applied to a construction method of a main tower of a long suspension bridge will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the main tower T has a height of, for example, 300 m or more when completed, and the main tower has a structure in which a pair of left and right tower bodies 1 are connected by diagonal members 2, Divided block 3 that is divided into multiple pieces at each height and then divided into multiple pieces
Are sequentially installed on the upper side and fixed by high-strength bolts, etc.

The pair of left and right tower bodies 1 of the main tower T have a gentle inclination so that they approach each other as they go upward like two legs of a trapezoid, and the outer surface 1a of each tower body 1 is slightly inward from the vertical plane. Leaning toward you.

First, the jib crane 4 used for constructing the main tower T, the staging 5 for mounting the jib crane 4,
The guide member 6, the hoisting winch 7, the divided block elevating table 8 that is vertically driven by the hoisting winch 7, and the like will be described.

As shown in FIGS. 1 to 3, the jib crane 4 is provided on a staging 5 so that the jib crane can move laterally, and the staging 5 is mounted on the upper end of the main tower T in the process of being installed and is not shown. The hoisting device is used to hoist the towers in order as the height of the main tower T increases.

The staging 5 includes a pair of girders 9 horizontally arranged near the upper end of the existing part of the main tower T on both front and rear sides,
It is composed of a pair of fixed beams 10 arranged outside the left and right towers 1 and supported by the tower 1 and supporting the girder 9. Both ends of the pair of girders 9 are inserted with the fixed beam 10. To the outside, and each tower body 1 increases with the height of the main tower T.
Shifts inward, so each fixed beam
The position of 10 is also switched inward.

The jib crane 4 includes a traveling platform 11 and a swivel platform provided on the traveling platform 11 so as to be swivel driven by a swivel drive mechanism.
12, the traveling platform 11 has traveling drive wheels 11a traveling along the rails on the girder 9 and four pairs of legs 11b that extend and contract with hydraulic cylinders. Prop 1
4 and crane winch 15 and its drive motor are provided.

On the other hand, a pair of hoisting winches 7 and a drive motor therefor are provided on the ground, and a wire 7a extending from these winches 7 extends to the central portion of the girder 9 via a sheave 7b.
One wire 7a extends to the left end of the girder 9 through the sheave 7c, extends downward from the left end of the girder 9 through the sheave 7d, and the other wire 7a is arranged symmetrically with the one wire 7a. The girder 9 extends downward through the sheave 7d at the right end.

Next, each of the two guide members 6 provided on the gently sloping outer surface 1a of each tower 1 in the process of being installed, and each of the two guide members 6 provided on the outer surface 1a of each tower 1 The divided block lifting table 8 (hereinafter, simply referred to as lifting table 8) that is guided in the vertical direction will be described.

The outer surface 1a of each of the towers 1 is spaced at a predetermined distance in the front and back from each other 2
The strip guide members 6 are fixed in parallel, and the guide members 6
Extends over the entire length of the outer surface 1a of the tower body 1 under construction. Each of the guide members 6 has a T-shaped cross section composed of a web material 6a and a flange material 6b, and the end portion of the web material 6a is fixed to the outer surface 1a by welding or bolts (see FIG. 7).

These guide members 6 are preferably attached to the outer surface 1a of the divided block 3 in advance before mounting the divided block 3, but may be attached after the divided block 3 is installed.

As shown in FIGS. 4 and 5, the lifting platform 8 includes a pair of front and rear A-shaped frames 16 arranged vertically and vertically with respect to the outer surface 1a of the tower body 1 on the outer surface 1a. It is connected by a connecting frame 17 located on the side, and has a structure in which an underframe 18 is detachably attached to the lower ends of a pair of A-shaped frames 16, and is suspended on a sheave 19 at the upper end of the A-shaped frame 16. A winch wire 7a is hung.

Guided parts which engage with corresponding guide members 6 as shown in FIG.
As shown in FIG. 7, each guided portion 20 is provided with an engaging portion 21 that engages with both side edges of the flange member 6b of the guide member 6 from both sides and the outer surface of the flange member 6a. A free wheel 22 that rolls is provided, and each guided portion 20 is a flange member.
Although restrained by 6b so as not to move in the front-rear direction and the left-right direction, each guided portion 20 can move in the up-down direction along the guide member 6.

However, the guide member 6 restrains the front-back movement of the lift 8 and the movement in the direction away from the outer surface 1a, and in the direction approaching the outer surface 1a by a roller or the like that abuts and rolls on the outer surface 1a. Movement may be restricted.

In this way, the lift table 8 is guided by the guide member 6 via the four guided portions 20 so as to be movable only in the vertical direction.

As shown in FIGS. 4 and 5, the underframe of the lifting table 8
By using 18 together with a bogie 23 having idle wheels on the lower side, this underframe 18 can also be utilized as a carriage for conveying the divided blocks 3, and the outer surface 1a of the tower body 1 can be used.
A transport path 24 is provided from the vicinity of the lower end to the reach range of a marine crane or the like, and a carriage 23 on which an underframe 18 is placed can be moved.

Next, a construction method for constructing the main tower T using the above-described apparatus will be described.

First, the underframe 18 of the lifting platform 8 is removed, and the underframe 18 is placed on the carriage 23 and moved along the transport path 24 into the reach of a marine crane or a draining crane.

Next, trolley the divided block 3 suspended by a sea crane.
The divided block 3 while being placed on the underframe 18 on the 23
Is conveyed to the vicinity of the lower end of the tower body 1. Then, the parts other than the underframe 18 of the lifting platform 8 are lowered, and the underframe 18 is connected to the lower ends of the pair of A-shaped frames 16 with bolts and nuts or the like.

Next, the lifting platform 8 is hoisted along the outer side surface 1a of the tower body 1 by winding the wire 7a with the hoisting winch 7.

At the time of this hoisting, since the guided portion 20 of the lift 8 is guided in the vertical direction by the guide member 6, the lift 8 and the divided blocks 3 placed on the lift 8 swing back and forth and left and right even if the wind blows. It is hung up without moving.

Moreover, since the outer side surface 1a is inclined inward, a force that approaches the outer side surface 1a acts on the lift 8 and the division block 3, causing the idler wheel 22 to substantially abut and roll on the outer surface of the flange member 6b. It will be hung up while being hung up.

By the time the lifting platform 8 reaches near the upper end of the tower body 1, the jib crane 4 can be moved to the end of the lifting platform 8 from which it is hoisted, and the four legs 11b can be extended and hoisted. I'm standing by. Then, when the lifting platform 8 rises to the upper limit position, the divided block 3 is hung by the hook of the jib crane 4, and the divided block 3 is mounted and fixed at a predetermined position on the uppermost stage of the tower body 1.

As described above, while the divided block 3 is transferred from the one lifting platform 8 to the jib crane 4 and mounted, the divided block 3 is placed on the other lifting platform 8 and lifted. In this way, when the divided blocks 3 are alternately lifted by the two hoisting winches 7 via the lifting platform 8, the jib crane 4 can be efficiently loaded without idling.
The work period can be shortened.

After the divided blocks 3 are mounted on the uppermost stages of the left and right tower bodies 1, staging 5 is performed by a lifting device (not shown).
The main tower T can be erected by elevating the jib crane 4 and the jib crane 4 to the uppermost stage, and then similarly sequentially carrying, lifting and mounting the divided blocks 3 in the same manner.

When the diagonal member 2 is hoisted, the underframe 8 of the lift 8 is not used, and hoisting is performed as shown in FIG.
In this case, a hanging piece for hanging with the hook of the jib crane 4.
If 25 is provided at a predetermined position determined by the relationship with the center of gravity of the diagonal member 2, when the diagonal member 2 is hung by the jib crane 4, the diagonal member 2 has a predetermined inclined posture suitable for mounting.

In the erection method according to the above-described embodiment, when the divided block 3 is hoisted, the guide member 6 guides the elevating table 8 in the up-down direction, while restraining the movement of the divided block 3 in the front-rear direction and the left-right direction. Since the divided block 3 is hoisted, the divided block 3 does not swing even if a considerable amount of wind blows, and the hoisting can be performed safely and at high speed.

Further, since two hoisting winches 7 are provided on the ground, and hoisting platforms 8 which are hoisted and driven by the hoisting winches 7 are respectively arranged on the outer surface 1a of each tower body 1, the divided blocks of each tower body 1 are provided. 3 can be hung in parallel or alternately, and the jib crane 4 can be fully operated to shorten the construction period.

Moreover, since the jib crane 4 only needs to mount the divided block 3 suspended near the upper end of the tower body 1 on the uppermost stage of the tower body 1, the winch 15 may be equipped with a relatively short wire.

Therefore, the winch 15 and its drive motor can be downsized, and the weight of the jib crane 4 and the lifting device can be reduced.

It should be noted that one common jib crane 4 as in the above embodiment is used.
Alternatively, various dedicated cranes may be used for each tower body 1. Alternatively, the hoisting winch 7 may be omitted, and the lifting platform 8 may be hoisted by the jib crane 4.

Further, it is desirable that the guide member 6 is detachably fixed with bolts or nuts rather than being welded to the outer surface 1a of the tower body 1. The guide member 6 may be provided with only one thread on each outer surface 1a. As the structure of the member 6, various members such as an L-shaped section, a rod-shaped member, a V-shaped or H-shaped rail-shaped member may be used.

However, the guide member 6 may be formed integrally with the divided block 3 when the divided block 3 of the tower body 1 is manufactured, and may be left permanently without being removed as a part of the tower body 1 after the installation is completed. Good. That is, in FIG. 4 and FIG. 5, the ridge portion 1b on the front surface or the rear surface of the tower body 1 may be used as the guide member 6.

The lifting platform 8 is not limited to the one in the embodiment, and may have a function of supporting (supporting by placing or supporting by hanging) the divided block 3 and a function of being guided by the guide member 6.

[Brief description of drawings]

The drawings relate to an embodiment of the present invention. FIG. 1 is a front view of a main tower and erection devices in the process of being erected, and FIG. 2 is a side view of the same.
FIG. 3 is a plan view of the same, FIG. 4 is a perspective view showing a state in which a divided block is set on an elevator, and FIG. 5 is a perspective view showing a state in which the divided block is supported and lifted by an elevator, FIG. FIG. 7 is a perspective view showing a state in which a diagonal member is supported and hoisted by an elevating table without a frame, and FIG. T ... Main tower, 1 ... Tower, 1a ... Outside surface, 3 ... Divided block, 6 ... Guide member, 7 ... Lift winch, 8
...... Lifting platform, 16 …… A-shaped frame, 17 …… connecting frame, 18 …… underframe, 20 …… guided part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobukatsu Tsujimura 8 Niijima, Harima-cho, Kako-gun, Hyogo Prefecture Kawaju Heavy Industries, Ltd. Western branch office (56) Reference JP-A-56-119080 (JP, A) JP 47-33223 (JP, B1) JP-B 51-42406 (JP, B2)

Claims (1)

(57) [Claims] 1. A erection method in which a divided block of a tower-shaped structure is hoisted by hoisting means and the tower-shaped structures are sequentially erected upward. A guide member extending in the vertical direction, a guided member which is guided in the vertical direction by the guide member and is movable along the one side surface, and a guide member which is releasably connected to the guided member and is integrally lifted up and down with the guided member. And a winch that is installed on the ground side and is used to vertically move the lift table and the guided member via a wire.The divided block is placed on the lift table on the ground side, and the guide member is used to guide the guided member. While lifting and lowering the lifting platform along the above-mentioned one side surface, the lifting platform with the divided blocks is hoisted up to near the top of the tower-shaped structure, and then on the top side of the tower-shaped structure. On the provided crane Passing a split block for mounting the divided blocks by the crane construction method of tower-like structure, characterized in that.