JPH0663207B2 - Construction method for erected floor floor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a construction method for erection of a catwalk floor set which is a scaffold for cable erection in a suspension bridge, and particularly to an ultra-long size with a long span. It concerns the construction method effective for suspension bridges.

(Prior Art) Conventionally, a sliding construction method and a bogie construction method are known as a construction method of a catwalk floor set of this type.

The sliding construction method is to assemble the floor assembly by sequentially adding the panel members one panel at a time on the catwalk rope near the top of the tower and sliding the entire floor assembly toward the center between the towers on the catwalk rope. It is a method of moving and then fixing the entire floor assembly to the catwalk rope.
In this method, where the rope is steep near the top of the tower, the floor set can be slid by its own weight, but the rope becomes less steep toward the center of the span, making it difficult to slide. And the winch rope is used to forcefully slide the entire floor frame to move it. However, in this method, the floor assembly is sequentially added and the entire floor assembly is slid along the catwalk rope, so as the construction progresses, the overall length of the floor assembly gradually becomes longer, and the catwalk rope and The friction resistance with the floor structure gradually increases, and in the case of a very long suspension bridge with a long span,
Even if a holing rope or winch rope is used, the entire floor assembly cannot be slid, and even if it slides, the floor assembly is damaged and the catwalk rope is damaged by friction. Therefore, the sliding method has a span length of at most 10
It can be implemented with a suspension bridge up to about 00 m, but the span is 20
It cannot be carried out on a super long suspension bridge of 00m class.

The trolley construction method is, for example, as disclosed in Japanese Patent Publication No. 53-10383 and Japanese Patent Publication No. 58-2283, in which a catwalk rope is used to movably support a material transporting trolley, and the trolley at the top of the tower has floor structuring materials. There is a method of assembling the floor assembly by carrying the equipment and transporting it to the work site and lowering the floor assembly material from the cart at the work location onto the catwalk rope. According to this construction method, it can be carried out even if the span is long, but a large dolly is required to mount the floor assembly material on the dolly, and extra labor is required for assembling, adjusting and removing the large dolly. Also, the number of days is required. In addition, even if the bogie is made large, there is a limit to the loading capacity of each bogie, so if the span becomes long, the bogie must be reciprocated between the top of the tower and the work place many times. In addition, the number of times the floor construction materials are loaded onto and unloaded from the dolly increases, and the running time of the dolly and the loading and unloading of the floor assembly materials occupies most of the working time per day. There is a problem that the actual work time per day is reduced, the work efficiency is poor, and the construction period becomes very long.

(Object of the Invention) The present invention has been made to solve such a problem, and improves the workability at the time of erection of a catwalk floor assembly, and eliminates the need for loading a floor assembly constituent material on a carriage. The trolley can be made smaller, and the labor and days for assembling, adjusting, and removing the trolley can be saved, the traveling time of the trolley can be shortened, and even a super-long suspension bridge can be efficiently implemented, resulting in a significant reduction in construction period. The purpose is to provide a possible catwalk floor construction method.

(Structure of the invention) In the construction method of the present invention, when the catwalk floor set is erected on the catwalk rope installed between the suspension bridge tower tops, a floor unit of a predetermined unit length is assembled near the tower top, At the rear end of the floor assembly, while moving the worker carriage for transporting the workers, move these along the catwalk rope to the erection position, then fix the above unit floor assembly on the catwalk rope, and then The worker dolly is removed from the unit floor set and moved back to the top of the tower, and then the above steps are repeated, and the leading end of the subsequent unit floor set is sequentially connected to the trailing end of the preceding unit floor set to form a predetermined shape. The catwalk floor assembly is installed.

According to this method, the unit floor set with a predetermined unit length is assembled near the top of the tower where the slope is the most slippery, so the unit floor set can be assembled while sliding by its own weight. Even if there is a unit length, that is, the span is divided into multiple units, it slides along the catwalk rope to the specified erection position, so sliding resistance is small, and the unit floor set is smooth to the erected position. And the unit floor sets are sequentially connected, so that the entire catwalk floor set can be efficiently assembled. Moreover, it is not necessary to load materials such as floor assembly materials on the dolly, and only a worker for fixing the above unit floor assembly to the catwalk rope needs to be loaded, so labor for loading and unloading materials In addition, time can be saved, the size of the truck can be reduced, and the labor and time required for assembling, adjusting, and removing the truck can be saved, and the construction period can be significantly shortened.

(Example) In FIGS. 1 and 2, a large number of catwalk ropes 2 are installed in parallel between the tower tops of the main towers 1a and 1b. In constructing the catwalk floor set 6 on the catwalk rope 2, a plurality of guide sheaves 31 are provided above the catwalk rope 2 and a tow rope 3 is provided.
And the rope 3 is provided so as to be reciprocally movable in the longitudinal direction of the rope by drive winches 32 and 33. Further, work scaffolds 11 and 21 and a drive winch 41 for the spare rope 4 are provided near the tops of the main towers 1a and 1b.

The catwalk floor assembly 6 (6a, 6b ...) is generally composed of a welded wire net 61 and a synthetic fiber net 6 as shown in FIGS. 4 and 5.
2, a step member 63, a horizontal beam member 64 such as a square pipe, a hand rope strut 65, a hand rope 66, a side synthetic fiber net 67, and the like, which are composed of floor assembly constituent materials,
Of the floor assembly materials, except for members that are inconvenient for roll winding, a welding wire net 61, a synthetic fiber net 62, and a step material 63
These three members are preliminarily polymerized on the ground to assemble a sheet-shaped floor assembly 60 having a predetermined length and wound into a roll, and the roll-shaped floor assembly 60 is provided at the top of the roll stand 12 [3rd As shown in Fig. (A)], it is supported so that it can be wound up and drawn out. The other floor assembly materials such as the step material 63, the cross beam material 64, the hand rope support 65, and the hand rope 66 are placed on the work scaffold 11 provided at or near the tower top.

And first, as shown in FIG. 3 (a), one main tower 1a
Assembling the cross bridge 5a near the top of
The bridge 5a is movably supported via a guide sheave, a press roller, etc. (not shown) in a state where the bridge 5a is laid across the catwalk rope 2.

Next, the roll-shaped floor assembly 60 is placed on the roll stand 12
From the catwalk rope 2 and its tip is connected to the cross bridge 5a, and while successively sliding these along the rope 2 toward the central part between the tower tops, the roll-like floor assembly 60 is sequentially developed. Then, the horizontal beam members 64 and the like are sequentially mounted on the floor assembly 60. In this case, the cross beam member 64 is loosely attached to the floor assembly 60 and the catwalk rope 2 via the mounting bolts 68 and the mounting plate 69 so that the floor assembly 60 can easily slide on the catwalk rope 2. The mounting bolt 68 and the mounting plate 69 are temporarily fixed so that they serve as a guide for sliding. Further, the hand rope support 65, the hand rope 66, the side face synthetic fiber net 67 and the like are temporarily fixed to the cross beam member 64 in a lying state. As a result, the unit floor set 6a having a predetermined unit length 1 is assembled.

Here, the length 1 of the unit floor set 6a is a length obtained by equally dividing the span L of the catwalk rope 2, and is, for example, a length corresponding to the above-mentioned interval of the cross bridges 5 installed at predetermined intervals in the interval. To do.

Next, the worker truck 7 is connected to the rear end of the unit floor set 6a. This worker cart 7 can be disassembled and assembled freely,
As shown in FIGS. 9 and 9, the upper frame 71 and a required number of frame members 72 are assembled into a box shape, a floor plate 73 is stretched on the bottom portion thereof, and a wire mesh 74 and the like are stretched on the peripheral surface thereof. It is configured by providing a doorway (not shown) at the ceiling or other suitable place, and this worker cart 7 is provided with a plurality of guide sheaves 7.
The unit floor set 6a is connected to the rear end of the unit floor set 6a while being movably supported by the catwalk rope 2 via the pressing roller 5 and the pressing roller 76.

At the time of the above work, each work of assembling and connecting the cross bridge 5a, the unit floor set 6a, and the worker truck 7 is performed near the tower top, so the tower top or the work scaffold 11
The worker 10 can freely come and go from above to the unit floor set 6a and the like, and the workability can be greatly improved. Also, since the catwalk rope 2 is steeply inclined near the top of the tower and the unit floor sets 6a and the like are slippery, the above-mentioned assembly and connection work is performed while sequentially sliding the unit floor sets 6a and the like only by their own weight. Can be done efficiently.

During the above work, safety and the unit floor assembly 6a after
In consideration of forced movement of the cross bridge 5a or the unit floor set 6a, the connecting rope 34 and the carrier 3 are previously attached.
5 to the tow rope 3, and if necessary, to the rear end of the cross bridge 5a or the rear end of the unit floor 6a to connect the spare rope 4, and the pull rope 3 or the spare rope 4 connects the cross rope Braking of the bridge 5a and the like is prevented from sliding more than necessary.

In this way, the cross bridge 5a and the unit floor set 6 near the top of the tower
After assembling and connecting a and the worker truck 7,
As shown in FIG. 3 (b), the cross rope 5a, the unit floor set 6a, and the worker truck are connected to the rear end of the truck 7 and the worker 10 is mounted on the truck 7. The three members of No. 7 are integrally moved to a predetermined erection position along the catwalk rope 2 through the tow rope 3 and the spare rope 4 toward the center of the span. At this time, the slope of the catwalk rope 2 is steep from the top of the tower to the vicinity of the 1/4 point of the span, so that the above three parties 5a, 6a, 7 can be moved by their own weight even if the pulling force is not applied by the pulling rope 3. It can be slid smoothly toward the central part. After that, as the center of the span is reached after the ¼ point of the span, the slope of the catwalk rope 2 becomes gentle and becomes difficult to slide, but in such a case, the drive winches 32, 3
Move the tow rope 3 in the direction of arrow A by 3 (tow)
At the same time, the drive winch 41 feeds the spare rope 4 to forcefully move the tripartites 5a, 6a, and 7 in the directions indicated by the arrows.

Next, in the erection position, as shown in FIG. 3 (c), the worker 10 transfers from the dolly 7 onto the unit floor set 6a and the like, and the unit floor set 6a and the unit floor set 6a and The hand rope support post that was temporarily fixed to the cross beam member 64 and the like in a lying state while fixing the cross bridge 5a at a predetermined position of the catwalk rope 2 while finely adjusting it according to the mark previously marked in the factory. As shown in FIG. 4, the unit floor set 6a is assembled in a predetermined shape by erecting 65 and fixing it to the cross beam member 64 and the like, and stretching a hand rope 66 and a net 67 between the columns 65.
In this case, all the positions may be fixed completely, or the positions may be fixed so as not to slip, and all the positions may be completely fixed after the entire length of the floor assembly 6 is connected.

After that, the connecting rope 34 connected to the tip of the cross bridge 5a is reconnected to the dolly 7, and while the worker 10 is transferred to the dolly 7, the drive winch 41 winds the spare rope 4 and the drive winch 33 By returning the tow rope 3, the worker carriage 7, the worker 10, and the connecting rope 34 are returned to the top of the tower.

Next, the carriage 7 is kept on the catwalk rope 2 while being supported by the top of the tower, and in this state, below that, the next cross bridge 5b is formed in the same manner as above.
And the unit floor set 6b are sequentially assembled and movably supported on the catwalk rope 2, and then the dolly 7 is connected to the rear end of the unit floor set 6b.
Is moved to a predetermined erection position, that is, a position following the unit floor assembly 6a erected last time, via the tow rope 3 and the spare rope 4 and the like.

After that, the following cross bridge 5b and unit floor set 6b
Is connected to the rear end of the preceding unit floor set 6a, is fixed to a predetermined position of the catwalk rope 2 and is assembled, and thereafter the above-mentioned steps are repeated, whereby the succeeding cross bridge 5b ... And the unit floor set 6b. The preceding unit floor set 6a
Will be installed in succession.

The same operation as above is performed from the other main tower 1b. However, in this case, the cross bridge is omitted only at the beginning, and the unit floor set 6a and the worker truck 7 are moved to the center of the span from the top of the main tower 2 and the tip of the unit floor set 6a is moved to the center of the span. In the middle part, the bridge is connected to the cross bridge 5a sent from the top of the main tower 1a, and thereafter, the same steps as above are repeated. As a result, from the tops of both towers toward the center of the span, the cross bridges 5a, 5b ...
are sequentially fed, and they are connected so as to be successively added from the center of the span toward both tower tops to assemble the catwalk floor set 6 having a predetermined shape.

By the way, in the above embodiment, the cross bridge 5 is provided near the tower top.
Although the a and the unit floor set 6a are connected, and these three members are moved to the center of the span in the state where the worker truck 7 is connected to the rear end thereof, the cross bridge 5a and the unit floor set 6a are alternately worked. You may make it move to the center of a span with the member truck 7, and connect the cross bridge 5a and the unit floor set 6a one by one in the center of a span. Further, the cross bridges 5a and 5b may be omitted.

(Effects of the Invention) As described above, the present invention assembles and connects a unit floor assembly having a predetermined unit length and a worker truck, etc. near the top of a tower where the slope is the most slippery, and the span Since the unit floor set having a length of a fraction is moved from the tower top to the center of the span along with the worker truck, the sliding resistance is small, and the unit floor set can be smoothly moved to the erection position, and The unit floor sets are connected so as to be sequentially added from the span center toward the tower top, and the entire length of the catwalk floor set of a predetermined shape is assembled and erected. Can be assembled efficiently. Further, although it is a construction method using a dolly, it is not necessary to load materials such as floor set constituent materials on the dolly, and only a worker for fixing the above unit floor set to the catwalk rope is required. In addition to saving labor and time for loading and unloading materials, it is possible to downsize the trolley,
Labor and time for assembling, adjusting, and removing the trolley can be saved, and the construction period can be significantly shortened.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a catwalk floor set is erected by the construction method of the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 (a) to (d) are process explanatory diagrams of the present invention. Fourth
FIG. 5 is a side view of the catwalk floor set, FIG. 5 is a plan view thereof, FIG. 6 is a sectional view of an essential part showing an example of a supporting structure for the catwalk rope of the unit floor set, and FIG. 7 is a partial front view thereof. FIG. 8 is a side view showing an example of a worker truck and its supporting structure, and FIG. 9 is a partial front view thereof. 1a, 1b ... main tower, 2 ... catwalk rope, 3 ...
Tow rope, 4 ... regret rope, 5a, 5b ... Cross bridge, 6 ... Catwalk floor assembly, 6a, 6b ... Unit floor assembly, 7 ... Worker trolley.

Claims (1)

[Claims] 1. When constructing a catwalk floor set on a catwalk rope erected between the suspension bridge tower tops,
Assemble a floor unit with a predetermined unit length near the top of the tower, and move them to a predetermined position along the catwalk rope with the worker carriage for transporting workers connected to the rear end of this unit floor unit. After that, the unit floor set is fixed on the catwalk rope, then the worker dolly is removed from the unit floor set and returned to the top of the tower, and then the above steps are repeated to remove the previous unit floor set. A catwalk floor assembly construction method characterized in that a catwalk floor assembly of a predetermined shape is installed by sequentially connecting the front ends of subsequent unit floor assemblies to the rear end.