KR20060096962A - Non shock method for replacement bridge bearing and partial concrete constrution with water jet - Google Patents

Abstract

The present invention relates to the maintenance work of bridge device for bridges and the local crushing method of concrete structure among the important members of the bridge.

The present invention maintains and repairs bridges by setting a new bridge device after crushing the bridge block integrally formed in the coping by using water jet equipment for spraying ultra high pressure of 2500 bar or more in maintaining the old bridge device. to be.

Upper slab, pier, coping, bridge arrangement, non-shrink mortar, water jet

Description

Non shock method for replacement of bridge system using water jet and local dismantling of concrete structure {Non shock method for replacement bridge bearing and partial concrete constrution with water jet}

1 is a schematic diagram of a hydraulic jack installation for raising the upper slab in general,

2 is a view showing a state in which the upper slab is raised,

3 is a view showing a state of cutting the surface to be broken after raising the upper structure,

4 is a view showing a state of crushing with waterjet which is the main process of the present invention,

5 is a view showing a block-out state in which the main rebar of the coping part is exposed;

FIG. 6A is a view showing a state where a new chair unit lower plate is set in a block-out position; FIG.

FIG. 6B is a view illustrating a process of installing formwork after pouring the process of FIG. 6A and pouring mortar without shrinkage;

7 is a view showing a state in which construction is completed.

<Description of Main Parts of Drawing>

1: upper slab 50: the upper plate of the stapler

2: pier or alternating 51: brace device elastic pad

3: hydraulic jack 52: the lower plate of the chair

4: bridge or shift coping 53: bridge block

100: grinder cutting 200: waterjet injection gun

300: cast iron of the pier 400: formwork

500: non-contraction mortar casting

The present invention is installed between the upper slab and the bridge of the bridge to accommodate the displacement of the upper slab (temperature change, upper live load, other special load) and the transfer device having a function to safely transfer to the lower structure, such as aging, flood damage, etc. It relates to a method of maintenance when the original function is lost due to contamination or defects due to external factors.

Bridges can be shaped in various forms according to road linear or natural obstacles and urban planning, but the basic configuration is a structure in which upper slabs are constructed by means of bridge devices at the top of bridges or bridges.

Bridges constructed as described above are subject to changes in expansion, expansion, and deflection depending on external factors such as temperature changes, vehicle traffic methods, other winds, and snow.

  This function of the device is deteriorated with time and will not function properly. If you do not replace the old device is a serious phenomenon occurs in the upper structure and the lower structure has been regularly checked and replaced.

In the case of replacement construction of the device, the upper slab is raised by using the hydraulic jack and then the replacement work is performed.

When lifting the hydraulic jack, place the jack between the piers and the slab.

1 is a state in which the jack is positioned between the upper slab 1 and the pier (2) when the state is ready to raise the upper slab (1) to operate the jack to operate the upper slab (1) as shown in Raises.

As described above, a part of the lower plate 53 and the coping 4 of the bridge device located in the coping 4 of the pier 2 in the state in which the upper slab 1 is raised is broken using a breaker.

In case of repairing the device using breaker, the concrete of large area is broken and it has the disadvantage of using a large amount of mortar when setting up the new device. It is broken with a bulky breaker in a narrow work space. This can also cause problems for worker safety.

In addition, it takes a lot of work time and cannot meet the characteristics of urgent repair work. The manpower required for the work is invested in a lot of costs compared to the effect.

In addition, since the shock is transmitted to the parts other than necessary for the operation, unexpected cracks are generated, and in particular, where the thickness of the pier 2 is thin, the accident of the breaker can not bear the structural accident.

An object of the present invention is a method developed to solve the shortcomings of the conventional repair method, to ensure the structural stability by minimizing the price by allowing the repair work in the state in which the upper slab is raised to the minimum height, one-person work method This is to reduce the work cost, to perform the partial dismantling of the concrete structure and the replacement device of the concrete structure, which is very small compared to the breaker, and there is no vibration and scattering dust.

The present invention is to cut the coping surface with a grinder cutting the site to be broken

 step:

Step to raise the upper slab to minimum using the hydraulic jack:

Using waterjet equipment to break up the concrete block and part of the coping

step:

Steps for setting the scaffolding base plate when the piers or alternating main bars are exposed:

Steps to mold the block by installing the formwork:

Steps for placing non-shrink mortar on the space of the installed formwork:

After the shrinkage mortar curing will be described how to replace the device to complete the construction by removing the hydraulic jack after setting the elastic pad, the upper plate of the device.

Figure 3 is a view showing the shape of cutting the portion to be broken, the previous step of the present invention, Figure 4 is a design according to the present invention is a view showing the shape of crushing concrete with the injection pressure of pure water.

The method according to the present invention is configured to allow the operator to work easily, as shown in Figure 4, the high-pressure spray for car wash, it is to be able to crush the desired part when the foot is ready to stand.

FIG. 5 is a view illustrating a blockout state in which the rebar 300 is completely exposed to the coping 4 part by the completion of the crushing operation. FIG. 6A illustrates the setting of the lower plate 52 of the pedestal device at the blockout of the coping 4. 6b after placing the mold 400 as shown in FIG. 6b and placing the non-shrink mortar 500, as shown in FIG. 7, the rubber pad 51 is placed on the lower plate 52. After setting the upper plate 50 thereon to remove the hydraulic jack is to complete the replacement device assembly work.

As described above, in the process of crushing the bridge during the replacement of the existing bridge device and the local dismantling of the concrete structure, when working with an electric or air compressor breaker, excessive impact on the structure, as well as a serious crack And cases of structural defects have occurred.

The construction method according to the present invention can be expected to a very stable effect because it does not transmit the impact by crushing only the water directly touched.

In addition, it is very safe to use a light injector instead of a very heavy breaker in a narrow space.

In addition, when crushing a narrow space, it can be expected to reduce the construction cost by drastically reducing the work time compared to the use of a breaker.

In addition, since the concrete is wet, the adhesive force is increased during non-contraction mortar casting.

  In addition, since there is no crack occurring on the block-out surface, no special leg treatment is required.

In addition, there is no scattering dust, no vibration, and the noise is extremely small, minimizing the occurrence of complaints.

In addition, environmentally friendly work is possible by installing work water treatment facilities.

As described above, the present invention is a very useful technique with respect to the replacement of the bridge device and the local dismantling of the concrete structure.

Claims (1)

Method of crushing concrete blocks without damaging the reinforcing bars by using water jet that sprays water at high pressure in the form of water spray gun among the methods of crushing bridge blocks settled in coping of concrete structures and piers.

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