JPH0334524B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a construction method for installing suspended scaffolds used for construction work at high places such as expressways, for example, work on deck decks of elevated bridges, directly below bridge girders.

(Prior art) Viaduct deck work usually involves erecting concrete or steel plate piers at intervals of about 30m to 50m based on the road plan, and then installing bridge girders on top of the piers by the bridge manufacturer. It will start.
The bridge girder is constructed between the upper piers using I-type or box-type girder materials. Afterwards, the bridge deck work will be carried out, but prior to this work, it is necessary to install suspended scaffolding for the safety of the construction work and the road under the bridge.

Conventionally, there are roughly two methods for assembling this suspended scaffolding. At the same time, scaffolding boards are hung one by one under the bridge girder and fixed to the bridge girder, and the scaffolding boards are interconnected.

The second method of assembling a suspended scaffold is to complete a divided scaffold of the entire width at a predetermined level on the ground, form one block, and then lift each block to a high place and secure it to the bridge girder. Then, such blocks are assembled on the ground, lifted and secured while sequentially moving from one position to another, and connected in the longitudinal direction.

(Problems to be Solved by the Invention) Therefore, when carrying out the first method, since the work requires skill, the work is carried out exclusively by people skilled in working at heights, and during this work Due to the risk of materials falling, at least traffic on the road below the bridge girder will be restricted.

On the other hand, although the second method requires almost no scaffolding work at high places, it occupies a large area of the road on the ground, and not only is it difficult to hoist wide objects horizontally, but this method also There are disadvantages such as stagnation of traffic due to the fact that the parking lot is occupied for a long time.

While the above two construction methods occupy roads for long periods of time and cause problems such as traffic stagnation, the present invention aims to eliminate such problems and improve work ease and safety. This provides a method for assembling scaffolding.

(Means for Solving the Problems) The method of the present invention is as follows: (1) Piers 1 are erected at predetermined intervals, and a construction zone below the bridge girder 2 is provided spanning between the upper ends of adjacent piers 1. In B, using aerial work vehicle X,
A pair of rails 4 are attached in parallel to both ends of the bridge girder 2 or to both ends of the rail suspension beams 3, either directly to the lower end of the bridge girder 2 or via rail suspension beams 3 attached at predetermined intervals perpendicular to the bridge girder 2.

(2) At least two motor blocks 5 are disposed on each rail 4 in a movable manner.

(3) Assemble the gondola 6 for rail installation work in the occupied zone B, hoist this gondola 6 up to just below the rail 4 using the chain 5a of the motor block 5, and operate the motor block 5 to move the gondola 6 to the rail 4. Bridge girder 2 along
is moved in the longitudinal direction and stopped at the tip of the rail 4.

(4) A worker on the gondola 6 installs rail suspension beams 3 at predetermined intervals in front of the existing rail 4 directly under the bridge girder 2 or perpendicularly to the bridge girder 2, and
A pair of rails 4 are attached in parallel to both ends of the rail hanging beam 3 or both ends of the rail hanging beam 3, and the rails 4 are extended.

(5) Operate the motor block 5 to move the gondola 6 forward in the longitudinal direction of the bridge girder 2 along the rail 4 and stop it at the tip of the extended rail 4. By repeating such work, the rail 4 is extended to the end of the scaffold where it is planned to be installed.

(6) Return the gondola 6 to the starting end of the rail 4, lower it onto the reserved zone B, and remove it.

(7) Assemble the divided scaffolding 7 of a predetermined length in the occupation zone B, lift the divided scaffolding 7 by the chain 5a of the motor block 5, and attach it to the motor block 5.
The bridge girder 2 is moved in the longitudinal direction along the rail 4 and stopped at the tip of the rail 4.

(8) After adjusting the position and posture of the divided scaffolding 7, hang it directly from the bridge girder 2 and fix it using fixing wires, chains 8, etc. Thereafter, the chain 5a of the motor block 5 is removed, and the motor block 5 is returned to the starting end of the rail 4 and lowered onto the occupied zone B.

(9) In the same manner, the next divided scaffold 7 assembled in the occupation zone B is transported to the divided scaffold 7 by the motor block 5, and is suspended and fixed to the bridge girder 2 using fixing wires, chains 8, etc., and is used as the first scaffold. Connect the second divided scaffold 7.

(10) By repeating these operations, the suspended scaffolding 7 is completed under the bridge girder 2 in the area scheduled for construction.
The gist is to assemble a suspended scaffold using the above steps.

(Example and operation) Hereinafter, the procedure for assembling a suspended scaffold according to the present invention will be explained with reference to FIGS. 1 to 7.

Pier 1 is generally erected at intervals of 30 to 40 meters on surface road A, and the above ground portion including Pier 1 is occupied by construction zone B.
A working space of a certain width is provided. This construction work will be carried out exclusively using this zone B, and will minimize traffic disturbance to automobiles. A bridge girder 2 is provided to span the upper ends of adjacent piers 1, and is made of, for example, an I-shaped or box-shaped girder material, and is fixedly installed by a bridge construction company. Note that the floor plate serving as the road surface of the elevated bridge is laid on the upper surface of the bridge girder 2.

Prior to the start of this floorboard work, in the occupied zone B, using an aerial work vehicle A pair of rails 4 are attached in parallel to both ends of the bridge girder 2 or both ends of the rail suspension beam 3 via the suspension beams 3 using hanging fittings (not shown). Next, install 2 bases on each rail 4, totaling 4
The base motor block 5 is arranged so as to be movable.
Then, in the occupied zone B, the gondola 6 for rail installation work is assembled. Further, the gondola 6 is provided with four mounting hooks (not shown) that can be hung from the chain 5a of the motor block 5. Load the 1.5 to 2 m long rail 4, rail suspension beam 3, and hanging hardware onto the gondola 6.
The worker also rides along (Figures 1 and 2). next,
The chain 5a is hooked to a mounting hook (not shown) of the gondola 6, and the motor block 5 is driven to wind up the chain 5a and lift the gondola 6 to a position directly below the rail 4.

In this state, the motor block 5 is operated to move the gondola 6 along the rail 4 in the longitudinal direction of the bridge girder 2 and stopped at the tip of the rail 4 as shown in FIG. 3a.

Next, a worker on the gondola 6 installs rail suspension beams 3 at intervals of about 1 m directly under the bridge girder 2 or perpendicularly to the bridge girder 2 in front of the existing rail, and A pair of rails 4 are attached to both ends in parallel using hanging fittings, and the rails 4 are extended. Furthermore, the gondola 6 is moved along the rail 4 in the longitudinal direction of the bridge girder 2 by running the motor block 5, and is stopped at the tip of the rail 4 as shown in FIG. By repeating such operations, the rail 4 is extended to the end of the scaffold where it is planned to be installed (Fig. 4a).

Next, the gondola 6 is returned to the starting end of the rail 4 and is lowered onto the reserved zone B and removed.

In FIG. 4, a divided scaffolding 7 having a full width and a predetermined length is assembled in an occupied zone B on the ground. Incidentally, each divided scaffold 7 is provided with four mounting hooks (not shown) that can be suspended by the chain 5a of the motor block 5. Next, the chain 5a is hooked to the attachment hook of the divided scaffold 7, and the motor block 5 is driven to attach the chain 5a.
a and lift the divided scaffold 7 to just below the rail 4.

In this state, the motor block 5 is remotely operated to move the unmanned divided scaffold 7 along the rail 4 in the longitudinal direction of the bridge girder 2 and stop it at the tip of the rail 4. Then, after adjusting the position and attitude of the divided scaffolding 7, it is directly suspended and fixed from the bridge girder 2 using a fixing wire, a chain 8, or the like. Thereafter, the chain 5a of the motor block 5 is removed from the mounting hook, and the motor block 5 is returned to the starting end of the rail 4 and lowered onto the occupied zone B. Next, private belt B
The second divided scaffold 7 assembled in step 1 is similarly transported to the first divided scaffold 7 by the motor block 5, and suspended and fixed to the bridge girder 2 with fixing wires, chains 8, etc., and the first and second divided scaffolds are Base division scaffolding 7
Connect. By repeating such work, the suspended scaffolding 7 is completed under the bridge girder 2 in the area where the viaduct deck construction is planned.

Under this condition, the viaduct deck construction will begin.

When the construction is completed, the hanging scaffold 7 is dismantled, but the dismantling method is the reverse of the above-mentioned assembly procedure.

In addition, in the construction method of the above embodiment, the divided scaffolding 7 that was divided only in the vertical direction was used, but the divided scaffolding 7 that was divided not only in the vertical direction but also in the horizontal direction (for example, in half) was transported to a predetermined position. The construction method of the present invention also includes the case of integral connection.

(Effect of the invention) The effects of this invention will be described below.

Since the main work is carried out in areas that do not obstruct traffic on the ground, that is, in many cases, in private strips that are used as median strips, or in areas that do not obstruct traffic under bridge girders, traffic is regulated during the work. In addition, the necessary equipment and divided scaffolding are transported from the work site to the designated location using motor blocks along the rails installed under the bridge girder, and the scaffolding is installed, so the work space on the ground is saved. It is sufficient even if it is narrow, and is particularly effective for installing suspended scaffolds in places where there is no work space below elevated roads, such as at grade crossings or above water.

[Brief explanation of drawings]

Figures 1 to 7 show the procedure of the construction method according to the embodiment of the present invention, in which Figure 1a is a front view, Figure 2b is a side view, Figure 2a is a front view, Figure 2b is a side view, Figure 3a
is a front view, Fig. 4b is a side view, Fig. 4a is a front view, Fig. 4b is a side view, Fig. 5a is a front view, Fig. 5b is a side view,
FIG. 6a is a front view, FIG. 6b is a side view, and FIG. 7 is a front view. 1...Pier, 2...Bridge girder, 3...Rail suspension beam,
4...Rail, 5...Motor block, 5a...
...Chain, 6...Gondola, 7...Divided scaffolding,
8...Fixing wire.

Claims (1)

[Scope of Claims] 1. A hanging scaffold assembly method characterized by the following steps (1) to (10). (1) Piers 1 are erected at predetermined intervals, and the aerial work vehicle
A pair of rails 4 are attached in parallel to both ends of the bridge girder 2 or to both ends of the rail suspension beams 3, either directly to the lower end of the bridge girder 2 or via rail suspension beams 3 attached at predetermined intervals perpendicular to the bridge girder 2. (2) At least two motor blocks 5 are disposed on each rail 4 in a movable manner. (3) Assemble the gondola 6 for rail installation work in the occupied zone B, hoist this gondola 6 up to just below the rail 4 using the chain 5a of the motor block 5, and operate the motor block 5 to move the gondola 6 to the rail 4. Bridge girder 2 along
is moved in the longitudinal direction and stopped at the tip of the rail 4. (4) A worker on the gondola 6 installs rail suspension beams 3 at predetermined intervals directly under the bridge girder 2 or perpendicularly to the bridge girder 2 in front of the existing rail 4, and attaches them to both ends of the bridge girder 2 or to the rail suspension beams 3. A pair of rails 4 are attached to both ends in parallel, and the rails 4 are extended. (5) Operate the motor block 5 to move the gondola 6 forward in the longitudinal direction of the bridge girder 2 along the rail 4 and stop it at the tip of the extended rail 4. By repeating such work, the rail 4 is extended to the end of the scaffold where it is planned to be installed. (6) Return the gondola 6 to the starting end of the rail 4, lower it onto the reserved zone B, and remove it. (7) Assemble the divided scaffolding 7 of a predetermined length in the occupation zone B, lift the divided scaffolding 7 by the chain 5a of the motor block 5, and attach it to the motor block 5.
The bridge girder 2 is moved in the longitudinal direction along the rail 4 and stopped at the tip of the rail 4. (8) After adjusting the position and posture of the divided scaffolding 7, hang it directly from the bridge girder 2 and fix it using fixing wires, chains 8, etc. Thereafter, the chain 5a of the motor block 5 is removed, and the motor block 5 is returned to the starting end of the rail 4 and lowered onto the occupied zone B. (9) In the same manner, the next divided scaffold 7 assembled in the occupation zone B is transported to the divided scaffold 7 by the motor block 5, and is suspended and fixed to the bridge girder 2 using fixing wires, chains 8, etc., and is used as the first scaffold. Connect the second divided scaffold 9. (10) By repeating these operations, the suspended scaffolding 7 is completed under the bridge girder 2 in the area scheduled for construction.