JPH09317399A - Mounting executing method of reinforcing steel plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method, in which operation, in which a steel plate is installed to the intermediate column of a subway, is executed safely, efficiently, accurately and economically. SOLUTION: Steel plates 2 transported by a truck are passed through stairs, a platform and a subway track and conveyed up to places, where intermediate columns 5 are mounted, by using a lightweight roller conveyor 36, the steel plates 2 are assembled tentatively at every fixed number, the tentatively assembled steel plates are set up onto a plurality of pawl jacks 48 fitted to the lower sections of the intermediate columns while being hung down by a plurality of hoist winches 46 installed to a ceiling, above-procedure is repeated successively, and the whole steel plates are assembled and welded temporarily. The steel plates are assembled completely, the whole steel plates are suspended by the hoist winches 46, the hoist winches 46 and the pawl jacks 48 are operated, separation, mounting height and perpendicularity are adjusted finely, the steel plates are fixed onto the intermediate columns 5, the strain of the steel plates due to welding heat generated at the time of main welding is corrected by screw bolts, and a resin or mortar is injected into clearances among the surfaces of the intermediate columns 5 and the steel plates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction technique for attaching a reinforcing steel plate for reinforcing a middle pillar such as a subway.

[0002]

2. Description of the Related Art In order to improve the earthquake resistance of a subway pillar, a steel plate is attached around the center pillar to reinforce it. Conventionally, such reinforcement is performed manually by the following procedure. (1) Transportation of steel plates For example, a U-shaped steel plate transported by a truck is manually transported to the center column installation position through stairs, platforms and subway vehicle tracks. For transportation from the platform to the center pillar on the track, assemble the frame scaffolding, secure a transportation route, and pass on it. In addition, the framework scaffold becomes a work scaffold. (2) Assembling of Steel Plates One middle pillar, for example, a U-shaped steel plate divided into eight is installed on a square bar installed at the lower part of the middle pillar, and two pieces are temporarily welded. Then, using the above-mentioned work scaffold, it is manually lifted to assemble two pieces each from the bottom to the top. (3) Fine adjustment of steel plate installation position After installing a steel plate on a square bar, adjust the height with a camber or the like. The separation (the distance between the surface of the center column and the steel plate) is adjusted by installing a spacer in the gap between the surface of the center column and the steel plate. The verticality of the steel sheet is adjusted by moving it manually. (4) Fixing of steel plate After finely adjusting the installation position of the steel plate, the steel plate is fixed to the center column with concrete anchors and countersunk bolts. The steel plates are fixed in sequence from the bottom of the middle pillar by two. (5) Injection of Filler Resin or mortar is injected into the gap between the surface of the inner pillar and the steel plate.

[0003]

The conventional manual construction has various problems as described below.

In the transportation of the steel sheet shown in the above procedure (1):-Since the steel sheet is heavy (about 50 kg / piece), a large number of people are required for transportation, and there is a problem in safety during transportation of dangerous places such as subway stairs. There is.

Since the frame scaffold is heavy and the work is performed in a narrow space, it takes labor and time to assemble and disassemble.

As a working condition, it is necessary to assemble and dismantle the framework scaffolds every day, and vehicles for maintenance and inspection often pass through during the work. Therefore, it is necessary to remove a part of the framework scaffolds each time. Therefore, the actual work time is shortened. There is such a problem.

In the assembling of the steel sheet shown in the above procedure (2), the steel sheet is heavy and requires a large number of people because it is manually installed.

Since the steel plates are assembled one by one, the number of operations is increased and the construction time is prolonged.

-Because many people work on a narrow scaffold,
Safety is an issue. There is such a problem.

In the fine adjustment of the installation position of the steel plate shown in the above procedure (3): Since the height of the steel plate is adjusted by the camber or the like, the fine adjustment is difficult.

While manually lifting and moving the steel plate,
Since the installation position is adjusted, it is difficult to finely adjust the vertical and horizontal joints of the steel plate, it is difficult to secure the root gap (interval between the joints of the steel plates), and the misalignment of the steel plates (deviation of the joints of the steel plates) ) Is likely to occur.

In the fixing of the steel plates shown in the above procedure (4):-Since the steel plates are sequentially fixed to the middle pillar by twos, the upper part is adjusted to the distance, the inclination is adjusted, the route gap is secured, and the steel plates are misaligned. Is difficult to adjust.

Since a series of processes (assembling, adjusting, fixing) can be performed only for two, work efficiency is poor. There is such a problem.

It is an object of the present invention to provide a method for safely, efficiently, accurately and economically attaching a steel plate to a center pillar, focusing on the above problems.

[0015]

SUMMARY OF THE INVENTION The present invention is a construction method for mounting a plurality of steel plates having a plurality of injection holes and mounting holes around a central pillar of a subway to reinforce the central pillar of the subway. The step of transporting the steel plate transported by the truck to the center pole installation position through the stairs, platform, subway track using a stairs carrier and a lightweight roller conveyor, and a predetermined number of steel plates Temporarily assembling each step, installing the temporarily assembled steel plate on the plurality of claw jacks installed at the bottom of the center pillar while suspending with multiple hoist winches installed on the ceiling, and repeat the above steps sequentially, Step of assembling and temporarily welding the entire steel plate, and after completion of the steel plate assembly, suspend the entire steel plate with a hoist winch, operate the hoist winch and the claw jack, and separate, mount height, lead Performing a fine adjustment of the sex, and the step of fixing after the fine adjustment completion, the steel sheet center post,
Distortion of the steel plate due to welding heat generated during main welding after completion of fixing the steel plate is characterized by including a step of correcting with a screw bolt and injecting resin or mortar into the gap between the surface of the intermediate column and the steel plate.

In such a construction method, the roller conveyor is provided on a scaffolding board of a built-in telescopic type installed on a plurality of lightweight pedestals.
The retractable built-in scaffolding plate is preferably made of aluminum.

Further, when the horizontal cross section of the center pillar is rectangular, the steel plates are U-shaped, and the temporary assembly is performed by pairing two pieces on each side of the center pillar, and the claw jacks are arranged on both sides of the center pillar. Two units will be installed in each. Further, the middle pillar is fixed to the steel plate by attaching concrete anchors and countersunk bolts to the attachment holes.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An example of the construction method of the present invention for attaching a steel plate to the middle pillar of a subway will be specifically described. In the following description, it is assumed that the steel plates are U-shaped, and a steel plate divided into eight parts is assembled for each center pillar. FIG.
Shows one steel plate. The steel plate 2 has a U shape as shown in FIG. 1, and includes a plurality of injection holes 4 and mounting holes 4a.
Is provided. The thickness of the steel plate is 6 mm.

(1) Attachment of hanging metal fittings / mounting of hoist winch As shown in FIG. 2, anchor bolts 6 are driven into the ceilings on both sides of the center pillar 5, and hanging metal fittings 8 with hooks 7 and 34 are attached.
And attach a lightweight hoist hoist winch (not shown) to the hook 7.

(2) Scaffold Assembly As shown in FIGS. 3 and 4, a lightweight, built-in telescopic scaffolding board 30 made of aluminum is installed on the subway tracks in parallel so as to sandwich the center pillar 5, and with the platform. Install two units each in the vertical direction. Built-in stretchable part 30a of the scaffolding plate 30
, Two other scaffolding boards 32 are arranged side by side and arranged near the center pillar 5 in parallel with the platform. On the other hand, an aluminum roller conveyor 36 is mounted on the scaffold plate 30. The scaffolding board 30
The parts 32 (including the extended part 30a) are installed on a plurality of aluminum mounts 38 whose height can be adjusted. In addition,
The scaffold plates 30 and 32 are also used as scaffolds for work.

When the third rail 40, which is a power supply rail for subway vehicles, is running near the lower portion of the center pillar 5, a third rail protection box 42 protects it.

(3) Carrying Steel Plates The U-shaped steel plates carried by the truck are carried to the platform by an electric carrier that can run on the subway stairs. As shown in FIG. 5, the electric transport vehicle 10 includes a frame body 16 provided with a stopper 12 at a front end and a grip portion 14 at a rear end, and four rollers 18 attached to the frame body.
And two endless tracks 20. This endless track extends between a drive roller 22 driven by a motor (not shown) and a driven roller 24.

The roller 18 bears the weight of the steel plate placed on the frame 16, and the endless track 20 serves to drive the carrier back and forth. Further, the endless track is provided with a protrusion 26 on the outer surface to prevent slipping when going up and down stairs.

The steel plate 2 is carried to the platform by such a carrier. The steel plate 2 carried to the platform is carried by the roller conveyor 36 to the scaffold plate 30a near the center pillar 5, as shown by the arrows in FIGS.

As described above, since the steel plate is transported by using the electric carrier and the aluminum roller conveyor, the working efficiency is improved and the dangerous places such as stairs can be safely transported. In addition, the scaffolding plate is lightweight and has a simple structure, so that the assembly and disassembly time can be shortened and a large storage space is not required. further,
The scaffolding board can be removed while the vehicle is being used for maintenance / inspection because the scaffolding board has a built-in telescopic structure, so only a part of it has to be stored.

(4) Assembly of Steel Plate As described above, the hanging metal fittings 8 attached to the ceilings on both sides of the center pillar are used.
Each of the hooks 7 has a lightweight hoist winch 46
And install four claw jacks 48 on both sides at the bottom of the center pillar. As the hoist winch 46, a 160 kg-suspended one was used, and as the claw jack 48, an allowable load of 2 t was used.

Then, two U-shaped steel plates 2 are temporarily assembled on both sides, installed on the hook jack 48 while being suspended by the hoist winch 46, assembled as a whole, and after confirming the root gap (2 mm), temporary welding is performed. To do.

Since both ends of the hanging metal fitting 8 are provided with the safety belt attaching hooks 34 at the time of working at a high place, the worker can wear the safety belt and perform the work safely.

According to such a steel plate assembly, since the work is carried out while being suspended by the hoist winch, it is safe and a small number of people can work. In addition, since two steel plates are temporarily assembled, the number of operations is reduced and the construction time is shortened.

(5) Fine adjustment of steel plate installation position After assembling eight U-shaped steel plates into one, two hoist winches 46 and four claw jacks 48 are operated to separate them (from the surface of the center pillar). Finely adjust the distance from the steel plate), mounting height, and verticality.

Therefore, in the above procedure (4), since the steel plates can be assembled regardless of the separation, it is easy to secure the root gap and prevent the steel plates from being misaligned. Also,
In the above fine adjustment, the height of the steel plate is adjusted by the claw jack, so that the height can be adjusted accurately. Further, since the vertical adjustment is finely adjusted after assembling the steel plates into one, the verticality can be secured.

(6) Fixing of Steel Plate After fine adjustment of the steel plate installation position (separation, mounting height, verticality) in the above step (5), concrete anchors, countersunk bolts, etc. are installed in the mounting holes 4a of the steel plate 2. Insert and fix the steel plate to the center pillar. In this way, after assembling the whole body, fine adjustment such as separation and the like and fixing to the center pillar enable accurate construction.

(7) Injection of Filler Resin or mortar is injected into the gap between the surface of the inner pillar and the steel plate. The injection is performed by the injection hole 4 which is previously provided in one steel plate.
Done from Since mortar is inferior to resin in injectability, it is preferable to use resin when the gap, that is, the separation is small. It should be noted that whether or not the filling material has been injected is confirmed by hitting the steel plate with wood and checking the sound.

While one embodiment of the construction method of the present invention has been described above, another embodiment will be described next.

Before the steel plates are attached to the center pillar, the steel plates for four pieces on one side are welded and installed on the claw jack by a hoist winch. Then, as shown in FIG. 6, the steel plate 2 is further provided with a screw hole, the screw bolt 9 is inserted into the screw hole, and the distance between the points can be accurately ensured by the length of the screw bolt inserted. The distance at each point is a known value as measured by prior survey. Then, the same work is performed on the other side, and the whole is assembled and temporarily welded.

According to such a method, since four pieces are temporarily assembled, the construction efficiency is improved. Further, since four pieces can be welded on the platform or on the platform instead of being suspended, it is possible to secure a root gap, prevent misalignment, and assemble the linearity with high accuracy. Furthermore, by adjusting the length of the screw bolt, not only the separation but also the fine adjustment of the steel plate installation position such as verticality can be easily performed. This screw bolt can also be used to correct the distortion of the steel plate due to welding heat that occurs during the main welding after the completion of fixing the steel plate.

In the above embodiments, the case where the horizontal cross section of the middle pillar is a rectangular prism is described, but when the middle pillar is a cylinder, the steel plate has an arc shape. In addition, the number of hoist winches and claw jacks installed is selected to facilitate construction.

It should be understood by those skilled in the art that the present invention is not limited to the above embodiments and various modifications and changes can be made within the scope of the present invention.

[0039]

According to the present invention, since a reinforcing steel plate can be attached to the middle pillar of a subway, a series of operations such as assembling the steel plate, finely adjusting the position, fixing to the middle pillar, and injecting a filling material can be performed. Construction time can be shortened.

Further, since temporary materials such as scaffolding plates and roller conveyors can withstand the weight of steel plates and are simple and lightweight, the installation time is short.

Furthermore, when using screw bolts,
By adjusting the length of the screw bolt, it is easy to make fine adjustments of the steel plate installation position such as separation and verticality. In addition, this screw bolt is generated during the main welding after the steel plate is fixed,
It can also be used to correct the distortion of steel plates due to welding heat.

[Brief description of drawings]

FIG. 1 is a perspective view showing a steel plate.

FIG. 2 is a view showing how to attach a suspension fitting.

FIG. 3 is a side view of a temporary material.

FIG. 4 is a plan view of a temporary material.

FIG. 5 is a side view of the electric transport vehicle.

6A and 6B are views for explaining the separation adjustment with a screw bolt, in which FIG. 6A is a horizontal sectional view and FIG. 6B is a vertical sectional view.

[Explanation of symbols] 2 U-shaped steel plate 4 Injection hole 4a Mounting hole 5 Middle pillar 6 Anchor bolt 7,34 Hook 8 Suspension metal fitting 9 Screw bolt 10 Electric vehicle 30, 32 Built-in telescopic scaffolding board 36 Roller conveyor 38 Frame 46 Hoist winch 48 claw jack

Claims (7)

[Claims] 1. A construction method for mounting a plurality of steel plates, each having a plurality of injection holes and mounting holes, around a central pillar of a subway in order to reinforce the central pillar of the subway. The transported steel plate is used for stairs
Using a lightweight roller conveyor, passing through stairs, platforms, subway tracks, and transporting to the center pillar installation position, while temporarily assembling a predetermined number of steel plates and suspending them with multiple hoist winches installed on the ceiling The steps of installing the temporarily assembled steel plates on the multiple claw jacks installed in the lower part of the center pillar, and repeating the above steps in order to assemble and temporarily weld the entire steel plate, and after completing the steel plate assembly, use the hoist winch. Suspending the entire steel plate and operating the hoist winch and claw jack to make fine adjustments to the separation, mounting height, and verticality; after completing the fine adjustments, fixing the steel plate to the center column; and after completing the steel plate fixing The distortion of the steel plate due to welding heat, which occurs during the main welding, is corrected with screw bolts, and the resin or mol Construction method comprising the steps of injecting Le, a. 2. The construction method according to claim 1, wherein the roller conveyor is provided on a scaffolding board of a built-in telescopic type installed on a plurality of lightweight frames. 3. The construction method according to claim 2, wherein the roller conveyor, the gantry, and the scaffolding plate are made of aluminum. 4. When the horizontal cross section of the middle pillar is rectangular,
4. The steel sheet according to claim 1, wherein the steel plate is U-shaped, the temporary assembly is performed by forming two pairs on each side of the center pillar, and the claw jacks are installed by two groups on each side of the center pillar. The construction method according to any one. 5. The construction method according to claim 1, wherein the middle pillar is fixed to the steel plate by mounting a concrete anchor and a countersunk bolt in the mounting hole. 6. When the horizontal cross section of the center column is rectangular,
The steel plate is U-shaped, and temporarily assembles a predetermined number of steel plates up to the ceiling on one side of the middle pillar, insert screw bolts into the screw holes drilled in the steel plate, and with the length of the inserted screw bolts,
The method according to any one of claims 1 to 3, wherein the distance between the points is accurately ensured, and the above procedure is performed on the opposite side of the center pillar. 7. The middle pillar is fixed to the steel plate by mounting a concrete anchor and a countersunk bolt in the mounting hole in a state where the screw bolt is inserted, and distortion of the steel plate due to welding heat at the time of main welding is applied to the screw bolt. To fix,
The construction method according to claim 6.