JPS63265005A - Cat walk bed construction method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a construction method for constructing catwalk floor structures, which are scaffolding for cable installation in suspension bridges, and particularly relates to a construction method for constructing catwalk floor structures, which are scaffolds for cable installation in suspension bridges. It concerns construction methods that are effective for suspension bridges.

(Prior Art) Conventionally, the sliding construction method and the trolley construction method are known as methods for constructing this type of catwalk floor assembly.

The sliding construction method involves assembling the flooring by sequentially adding flooring materials one panel at a time on a catwalk rope near the top of the tower, and then sliding the entire flooring one after another on the catwalk rope toward the center of the MA gap. and then move the
This is a method of fixing the entire floor assembly to the catwalk rope. In this construction method, j? 5. Near JrJ, where the slope of the above-mentioned robe is steep, you can confidently slide the floor assembly, but as you get closer to the center of the span, the slope of the above-mentioned rope becomes gentler and it becomes difficult to slide. This is used to force the entire floor assembly to slide and move. However, with this construction method, the entire floor assembly is slid along the catwalk A-Clove while adding floor assembly materials one after another, so as the construction progresses, the overall length of the floor assembly gradually increases, and the catwalk rope The frictional resistance between the floor assembly and the floor assembly gradually increases, and in the case of a long span Suspension Bridge, it becomes impossible to make the entire floor assembly slide even if Holin robes or winch lobes are used, and even if it does slip, the floor assembly will not be able to slide. Damage or catwalk rope 1
! ! Damage may occur due to accidental damage. For this reason, the sliding method can be implemented on suspension bridges with a span length of up to about 1,000 m, but it cannot be implemented on ultra-long suspension bridges with a span of 20,007 FL class.

In the bogie construction method, for example, as shown in Japanese Patent Publication No. 53-10383 and Japanese Patent Publication No. 5B-2283, a platform for transporting materials is supported on a catwalk rope in a movable manner, and the platform is attached to the platform at the top of the tower. In this method, the materials are loaded and transported to the work site, where the floor assembly components are lowered from the cart onto a catwalk rope to assemble the floor assembly. This construction method can be implemented even if the span is long, but a large trolley is required to load the floor assembly constituent materials onto the trolley, and the assembly, alignment, and removal of the large trolley requires extra work. This requires a lot of effort and IE a.

In addition, even if the trolley is made larger, there is a limit to the amount it can load at one time, so if the span becomes longer, the trolley must be moved back and forth between the top of the tower and the work site many times. and,
The number of loading and unloading of floor assembly materials onto the trolley increases, and the running time of the trolley increases, as well as the loading and unloading of floor assembly materials.
Since unloading time occupies most of the daily working time, the actual work hours per day for floor assembly erection are reduced, resulting in poor work efficiency and a very long construction period.

(Purpose of the Invention) The present invention has been made to solve these problems, and it is an object of the present invention to improve workability when constructing catwalk floor assemblies, and to eliminate the need for loading floor assembly constituent materials onto carts. This makes it possible to downsize the bogies, save labor and days for assembling, adjusting, and removing the bogies, as well as shorten the running time of the bogies. The purpose of this project is to provide a catwalk floor assembly construction method that can shorten the construction time.

(Structure of the Invention) In the construction method of the present invention, when constructing a catwalk floor assembly on a catwalk rope installed between the tops of suspension bridge towers, a floor assembly of a predetermined unit length is assembled near the tower top, and the unit After moving the trolley connected to the rear end of the floor assembly to a predetermined position along the catwalk rope, the unit floor assembly is fixed on the catwalk rope, and then the trolley is moved from the unit floor assembly. Remove it and move it back to the tower top, then repeat the above process and connect the tip of the subsequent ψ-position floor assembly to the II end of the preceding unit floor assembly in order to construct a catwalk floor assembly of a predetermined shape. It is characterized by

According to this construction method, single-bud floor assemblies of a predetermined unit length are assembled near the top of the tower, where the slope is the steepest, making it possible to assemble unit floor assemblies while sliding them under their own weight. Even if it is a suspension bridge, the unit length, that is, the span divided into multiple lengths, is slid along the catwalk rope to the predetermined erection position as a ψ-position floor assembly, so the sliding resistance is small, and the unit floor assembly is erected. The entire catwalk floor assembly can be assembled efficiently by moving the catwalk floor assembly smoothly to the desired position and connecting the unit floor assembly in sequence. Moreover, there is no need to load materials such as floor assembly constituent materials onto the trolley, and only a worker needs to get on board to fix the unit floor assembly to the catwalk rope, so it takes less effort to load and unload materials. In addition, time is saved, the trolley can be made smaller, labor and time for assembling, adjusting, and dismantling the trolley are also saved, and the construction period is significantly shortened.

(Example) In FIGS. 1 and 2, a large number of catwalk ropes 2 are installed in parallel between the tops of main towers 1a and Ib. When constructing the catwalk floor assembly 6 on this catwalk 0-12,
A plurality of guide sheeps 31 are placed above the pulling loaf 3.
The rope 13 is provided so as to be reciprocally movable in the longitudinal direction of the rope by drive winches 32 and 33. In addition, a work scaffold 11.21 and a driving winch 41 for the spacing row 14 are provided near the tops of the main towers 1a and 1b.

The catwalk floor assembly 6 (6a, 6b...) generally includes a welded wire mesh 61, a synthetic fiber net 62, a step material 63, a horizontal beam material 64 such as a square pipe, etc., as shown in FIGS. 4 and 5.
It is composed of floor assembly constituent materials such as hand rope support 65, hand rope 166, side synthetic fiber net 67, etc. Among the floor assembly constituent materials, welded wire mesh 61 and synthetic fibers are used, excluding members that are inconvenient for rolling. The net 62 and the step material 63 are overlapped on the ground in advance to assemble a sheet-like floor assembly 60 of a predetermined length and wound into a roll, and this rolled floor assembly 60 is installed at the top of the tower. Roll stand 12 [
It is supported so that it can be wound up and unwound freely. In addition, other floor assembly constituent materials, namely step materials 63, cross beam materials 64, hand rope supports 65, and hand ropes 66
etc. are placed on the work scaffold 11 provided at or near the tower top.

First, as shown in Fig. 3(a), one of the main towers 1a
Assemble the cross bridge 5a near the top of the tower,
The bridge 5a is installed across the gap 1 and the walk rope 2 and is movably supported via a guide sheave AT and a presser roller shade (not shown).

Next, the rolled flooring material 60 is placed on the roll stand 12.
The catwalk ropes 2 are fed out from the catwalk ropes 2 and their tips are connected to the cross bridge 5a, and the rolled flooring materials 60 are sequentially rolled out while sliding them sequentially along the rows 12 toward the center between the tower tops. Then, the cross beam members 64 and the like are sequentially installed on this floor assembly member 60. In this case, the cross beam members 64 are installed loosely with respect to the floor members 60 and the catwalk rope 2 through bolts 68 and clearance plates 69 so that the floor members 60 can easily slide on the catwalk rope 2. At this time, the bolt 68 and the mounting plate 69 are temporarily fixed so that they serve as a sliding guide. Further, hand rope supports 65, hand ropes 166, synthetic fiber nets 67 for side surfaces, etc. are temporarily fixed to the horizontal beam members 64 in a laid down state. As a result, a unit floor assembly 6a having a predetermined unit length g is assembled.

Here, the length a of the unit floor assembly 6a is determined by equally dividing the span of the catwalk rope 2, and is, for example, the length corresponding to the above-mentioned spacing of the cross bridges 5 installed at predetermined intervals in the span. do.

Next, the worker trolley 7 is connected to the rear end of the unit floor assembly 6a. This trolley 7 can be disassembled and assembled freely, and as shown in FIGS. 8 and 9, it is assembled into a box shape with an upper frame 61 and a required number of frame members 62, and a floor plate 63 is stretched on the bottom of the box, and a wire mesh is attached to the surrounding surface. 64, etc., and an entrance/exit (not shown) is provided in the ceiling or other appropriate location.
It is movably supported on the catwalk rope 2 via the cable 66 and connected to the power restoration of the floor assembly 6a at the ψ position.

During the above-mentioned work, each work of assembling and connecting the cross bridge 5a, unit floor assembly 6a, and worker trolley 7 is performed near the top of the tower.
The worker 10 can come and go from above 1 to above the unit floor assembly 6a at will, greatly improving the work efficiency. In addition, near the top of the tower, the catwalk rope 2 has a steep slope and the unit floor assemblies 6a, etc. are in a slippery state, so the assembly and connection work described above must be carried out while the unit floor assemblies 6a, etc. are sliding one by one using their own weight. can be done efficiently.

In addition, during the above work, safety and subsequent unit floor assembly 6a
In consideration of forced movement such as
5 to the traction loaf 3, and if necessary, connect the sagami loaf 4 to the II end of the cross 1 rigid 5a or the rear end of the unit floor assembly 6a, and use the traction loaf 3 or sagami loaf 4 to To brake the cross bridge 58 etc. from sliding more than necessary.

In this way, near the top of the tower, the cross bridge 5a and the unit floor assembly 6
After assembling and connecting the work platform IZ7 and the worker stand IZ7, connect the gagashi row 14 to the rear end of the trolley 70 as shown in FIG. ,
These cross bridges 5a, unit floor assemblies 6a, and the champion of the worker trolleys 7 are integrated along the catwalk rope 2 toward the center of the span via the pulling row 13 and the lobes 4, etc. to a predetermined erection position. move the target. At this time, since the slope of the catwalk rope 2 is steep from the top of 1 to 5 to around the 1/4 point of the span, the above-mentioned three members 5a, 6a, and 7 can be moved under their own weight without applying the traction force by the traction row 13. This allows it to slide smoothly toward the center of the span. After that, the slope of the catwalk rope 2 becomes gentler as it reaches the center of the span after the 1/4 point of the span, and it becomes difficult to slide.
By moving (pulling) the traction lobe 3 forward in the direction of arrow A with ゜33, and by letting out the sparing row 14 with the drive winch 41, the three members 5a, 6a, and 7 are forcibly moved in the direction of the arrow. let

Next, at the above-mentioned erection position, as shown in FIG. 3(C), the worker 10 transfers from the trolley 7 to the upper part of the middle 9-floor assembly 6a, and attaches the unit floor via bolts 68 and plates 69, etc. The set 6a and the cross bridge 5a were fixed in the predetermined positions of the catwalk rope 2 while finely adjusting them according to the marks pre-marked at the factory, and were temporarily fixed to the above-mentioned cross beam members 64 etc. in a lying state. As shown in FIG. 4, hand lobe columns 65 are erected and fixed to cross beam members 64, etc., and hand lobes 66 and nets 67 are stretched between the columns 65 to assemble the unit floor assembly 6a into a predetermined shape.

In this case, all the parts may be fixed completely, or it may be fixed to one ship so that it does not slip for the time being, and after the length of the floor 1116 is connected, all parts may be completely fixed.

Thereafter, the connecting row 134 connected to the tip of the cross bridge 5a is reconnected to the trolley 7, and while the worker 10 is on the trolley 7, the drive winch 41 winds up the loaf 4, and the drive winch 33 By returning the pulling row 13, the worker cart 7, the worker 10, and the connecting row 134 are returned to the top of the tower.

Next, the above-mentioned trolley 7 is kept on standby at the top of the tower while being supported by the catwalk rope 2, and in this state, below it, the next cross bridge 5b is installed in the same manner as above.
After assembling the unit floor assembly 6b in sequence and movably supporting it on the catwalk rope 2, the above-mentioned cart 7 is connected to the rear end of the unit floor assembly 6b, and these three units 5b, 6b, 7
is moved to a predetermined erection position, that is, to a position following the previously erected unit floor set 6a, via the pulling row 13, the spacing lobe 4, etc.

After that, the subsequent cross bridge 5b and unit floor assembly 6b
is connected to the rear end of the preceding unit floor assembly 5a, and is assembled by fixing it to a predetermined location of the catwalk rope 2.Then, by repeating the above steps, the subsequent cross bridge 5b... and unit floor assembly are assembled. 6b... are successively constructed in succession to the preceding unit floor assembly 6a.

Note that 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 assembly 6a and the worker trolley 7 are moved from the top of the main tower 2 to the center of the span in a connected state, and the tip of the unit floor assembly 6a is moved to the center of the span. At the center of the tower, the cross bridge 5a sent from the top of the main tower 1a is connected to the IP, and thereafter the same process as above is repeated. As a result, cross bridges 5a, 5b... and unit bed sets 5a, 5b... are sent in sequence from the tops of both towers toward the center of the span, and they are sequentially added from the center of the span toward Iff of both towers. A catwalk floor [16] having a predetermined shape is assembled by connecting the two parts in this way.

By the way, in the above embodiment, the cross bridge 5 is located near the top of the tower.
The cross bridge 5a and the unit floor assembly 6a were connected to each other, and the worker trolley 7 was connected to the rear end, and these three were moved to the center of the span. It may be moved to the center of the span together with the passenger truck 7, and the cross bridge 5a and the unit floor assembly 6a may be successively connected at the center of the span. Further, the cross bridges 5a and 5b may be omitted.

(Effects of the Invention) As described above, the present invention is capable of assembling and connecting a floor assembly of a predetermined unit length of about 1 p.m. Since the unit floor assembly, which is a fraction of the length of the tower, is moved together with the worker's cart from the top of the tower to the center of the span, the sliding resistance is small, and the unit floor assembly, etc. can be moved smoothly to the erection position. Since the unit floor assemblies are connected in order from the center of the span toward the top of the tower, the entire length of the catwalk floor assembly of a predetermined shape is assembled and erected. can be assembled efficiently. moreover,
Although this construction method uses a trolley, there is no need to load materials such as floor assembly constituent materials onto the trolley, and only a worker needs to get on board to fix the unit floor assembly to the cat walk rope. Not only can the labor and time of loading and unloading be eliminated, but the trolley can also be made smaller, and the labor and time of assembling, adjusting, and removing the trolley can also be saved, and the first stage can be significantly shortened. .

[Brief explanation of the drawing]

Fig. 1 is a side view showing the catwalk floor structure being constructed by the construction method of the present invention, Fig. 2 is a plan view thereof, Fig. 3 (a) to (d) are process explanatory diagrams of the present invention, Fig. 4 is a side view of the catwalk floor assembly, Fig. 5 is its plan view, Fig. 6 is a cross-sectional view of essential parts showing an example of the support structure for the catwalk O-b of the unit floor assembly, and Fig. 7 is its plan view. FIG. 8 is a side view showing an example of the worker's trolley and its support structure, and FIG. 9 is a partial front view thereof. la, lb...Main tower, 2...Character 1-Laoak rope, 3...Tow robe, 4...Giving robe, 5
a. 5b...Cross bridge, 6...Cat walk floor assembly, 6a, 6b...Unit floor assembly, 7 River worker trolley. Patent applicant Kobe Steel Co., Ltd. Agent
Patent Attorney Etsushi Kotani Patent Attorney Chief 1
) Masamukai Patent Attorney Yasuo Itaya Figure 4 Figure 8 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. When constructing a catwalk floor assembly on the catwalk rope installed between the tops of the suspension bridge towers, a floor assembly of a predetermined unit length is assembled near the tower top, and a trolley is connected to the rear end of the unit floor assembly. After moving these to a predetermined position along the catwalk rope in a state where the unit floor assembly is fixed on the catwalk rope, the cart is then removed from the unit floor assembly and moved back to the top of the tower, after that,
A catwalk floor assembly construction method characterized by repeating the above process and sequentially connecting the tip of a subsequent unit floor assembly to the rear end of the preceding unit floor assembly to construct a catwalk floor assembly of a predetermined shape.