Daehwa Precision

Grouting
Equipments

Packer Reinjector Syringe Injector

대화정밀공업은 최고 품질의 자재를 생산하기 위해 노력합니다.: Reinjector

Reinjector system

The reinjector system is a proven technology which has been applied to construction of Seoul and Daegu Metropolitan Subways as well as of Incheon International Airport. its simple, practical design enables even non-expert users to easily handle the system and inject resin deep down into the crack.

Need for new technology

The tests on core injection status after crack repair works with existing injection systems show that the resin cannot reach the shear parts of the crack but remains just in the near-surface area. As the existing systems are not capable of injecting resin into small crack areas, a new technology of resin injection is needed to boost the durability of concrete structures.

Features

The reinjector system has adopted only the advantages of high-pressure and low-pressure injection systems to implement a dual injection scheme: the primary high-pressure injection into major crack areas with forced power and the secondary low-pressure injection into small crack areas and shear parts of the crack aided by the capillary phenomenon of the injector, that is, a slow secondary injection with spring force during the pot life.

It is also possible to check the injection with the unaided eye. There are no losses of structures caused by high-pressure method.
andd because labor costs are cut back, construction costs can be kept down. Because any ordinary technicians with no experience can simply read the specifications and get the job done, it is widely used not just in civil engineering, construction sites, but also in repairing cracks in existing structures.

Specifications Specifications Capsule capacity 25cc Bench diameter Φ50 Max.pressure 29.2kgf Min.pressure 24.3kgf Max.length 135mm Min.length 100mm Weight 45g Surface adhesiveness 43kgf

Specifications
Specifications
Capsule capacity	25cc
Bench diameter	Φ50
Max.pressure	29.2kgf
Min.pressure	24.3kgf
Max.length	135mm
Min.length	100mm
Weight	45g
Surface adhesiveness	43kgf

Reinjector Injection System

01. Checking

Examine the crack status, width, depth, and others prior to deciding injection method.

02. Preprocessing

Remove all dust and dirt from the crack for injection efficiency and clean off any oily residue with a detergent such as thinner.

03. Marking the bench positions

if the concrete thickness is 200mm~300mm and the crack width is 1mm or less, Five benches are required per meter in general.
The required number of benches Depends on concrete thickness and crack width.

04. Attaching the benches

Attach and fix the injection benches with epoxy sealing material.
Make sure that sealing material is applied to the bencher seamlessly.

05. Sealing

Perform 1mm-thick, 30mm-wide epoxy sealing on the crack except the parts where the benches are placed, in an effort to prevent injection material from Overflowing the crack.
Verify that sealing material has hardened sufficiently.

06. Checking hardening status

In general, 12~24 hours are required for hardening.

07. Injection

Attach the cylinder body of the reinjector to the benches and inject epoxy with an injection device.
If injection pressure is increased, the cylinder moves in reverse direction, and the system transits from high pressure injection phase to mid or low pressure injection phase, Finally there remains about 25CC of injection material in the container.
The powerful internal spring allows for seamless repair work by putting the remaining material to use in the secondary injection.
If the injection material in the cylinder is used up before hardening, perform recharge immediately.

08. Hardening of injection material

As the initial hardening is completed in 1(summer) or 2(winter)days, you can proceed to the finish work.

09. Finish

Remove the reinjector and benches, and peel off the sealing material with a putty knife while applying heat to the sealing material with a torch lamp. If the sealing material does not peel off, grind it off with a disc sander for the finish.

Work photo