Introduction of Multifunction

Precast Concrete Production Line

COMPANY PROFILE

About CNBM

China National Building Materials Corporation (CNBM), which is established in 1984, is one of

largest state-owned corporation of construction materials & materials with total assets of USD

60 billion and a total staff of 140,000. CNBM now owns 300 subsidiary companies of solely

owned and joint-venture companies, 6 publicly listed companies in which CNBM has a

controlling percentage of shares; 20 publicly listed companies in which CNBM has a

substantial percentage of shares.

Oversea Branches CNBM INTERNATIONAL CORPORATION U.A.E BRANCH

CNBM INTERNATIONAL CORPORATION K.S.A BRANCH

CNBM INTERNATIONAL CORPORATION IRAN BRANCH

CNBM (U.S.A) CORPORATION

CNBM INTERNATIONAL(RUSSIA)CORPORATION

CNBM INDIA CORPORATION

CNBM NIGERIA CORPORATION

CNBM KAZAKHSTAN BRANCH

UNDER CONSTRUCTION OTHER PLACES

On Precast Concrete Production Line

Our international R & D team is consists of domestic senior technical staffs and European experts. We

established an institute on precast concrete machines in Italy for construction industrialization development and

precast concrete production line overall solutions guidance and promotion. We are the first enterprise capable of

R & D, manufacturing on multifunction precast concrete machines. We own more than 20 national patents and

certificated by ISO9001 quality system, CE and CU-TR.

Our job is to assist customers in meeting the needs of costruction companies in their respective markets. We

offer consultation at all stages - from the very early stages of building construction planning to production

renewal. We supply production lines, machines, equipment, and know-how to anyone who wants to move into

precast.

Main Products

2. Construction Industrialization Production Line

3. Vertical Type Wall Panel Production Line

4. Compound Insulation Wall Panel, Self-insulation

Block Production Line

5. Extruded Wall Panel Production Line

6. Precast Concrete Production Line

1. Multifunction Precast Concrete Production Line

PRODUCTION LAYOUT

MULTIFUCTION PRECAST CONCRETE PRODUCTION

LINE

A. Typical Layout

In continuous production line, the Slipformer works on the matched platform(suitable length between 120-150 meters)

to finish production .

Slipformer likes a mobile mold moves on the platform to produce PC components by batching, extruding, vibrating,

smoothing etc. and keeps the components in one shape.

This production is continuous and without breaking off. The pretensioned steel can be released after the concrete

hardened. Then cut the components in different lengths by the synthetic diamond saw blade on the cutting machine.

Machines commissioning

B. Working Principle

C. Main Equipment

1. Precast forming machine(Slipformer)

Power: 25KW

Weight: 7500KG

Dimensions:

L4300xW1750xH2280

Product:

Hollow core panels, solid panels,

beams, columns,

double T, single T, I-beams,

insulation panels, sandwich panels

● Slipformer, full name is slip type precast concrete forming machine, which adopts the most advanced technology

in the world and has forty years’ history in Europe. Our company hired a Italian engineers team, after years of

research and practice, successful integrate multi-function into one machine. To enable products to reach world-

class level, the device is produced strictly in accordance with European standards. Many of its core components

are imported, such as, electrical components are from Siemens or Schneider, vibrator from Italy, key bearing

from SKF of Sweden and NTN of Japan etc. The slipformer moves on the production platform, continuous

vibrate and extrude the concrete to form shapes and reach high dense, finally different components are put out.

The molds can be customized in different specifications according to customer demand, to achieve superior

performance of diverse production.

● The device consists of:

Movement System --- Powered by electricity; Travel speed adjusted by inverter;

Molding System--- Changing different molds to produce various types of prefabricated components;

Feeding System --- Store and supply concrete for the equipment.

● Advantages: With its unique design, just by replacing difference molds, the slipformer can produce different

prefabricated components. This technology makes the production of different types of prefabricated components

easier and more efficient and reduce the investment to lowest. In one platform, hollow core slabs, solid panels,

wall panels, T-beams, double T panels etc. can all be produced.

Slipformer(Column Series)

2. Bed Cleaner

Bed Cleaner can simultaneously or

separately perform the following tasks:

• Cleaning the leftover concrete

• Moving on track controled by the power unit

• Brushing release agent

• Laying the rebar

The electrical control panel contains all the

work control orders to keep the machine

function well.

Power

Cleaning: 5.5KW

Moving: 7.5KW

Hydraulic: 1.5KW

Brushing release agent: 0.75-1.5KW

Dimensions: 4500 * 1910 * 2425MM

Weight: 4980KG

3. Cutting machine

Power

Cutting: 37KW

Walking: 4KW

Vertical moving: 1.5KW

Lateral moving: 0.75KW

Dimensions: 2800 * 2500 * 2200MM

Weight: 3200KG

Max. cutting height: 500mm

Four wheels, two-wheel drive

Driving wheels operated by inverter with electric

The machine frame is made by high-strength steel

Main parts:

• Electric reel machine for power supply

• Water tanks for cutting sheet cooling

• Gear set

• Electrical panel

• Digital operation control panel.

4. Lifting Devices

In the production, several steps require lifting and transporting.

In the precast plant, the finished components need to be transfered to stockpile area to empty the production platform; it also

needs lifting devices to load the components on trucks before sending to the construction site.

At the construction site, lifting devices are required for removing PC components from the trucks, installation and assembling.

The lifting equipment must be suitable for lifting PC components to ensure the production and construction safety.

Important requirements on concrete batching plant

• Productivity meets the demand of PC plant

• Precise dosing on solid materials(sand, gravel, cement). Use high precision dosing system to accurately detect the

weight of ingredients (measuring volume is inaccurate)

• Precise dosing water. It is very important for producing semi-dry concrete. This requires consideration of the ingredients,

particularly sand, can maintain a lot of water. In this case, the theoretical amount of water requirement needs to be

drastically reduced. The solution is to configure all sand hoppers with humidity sensor, so does the mixer. To detect the

actual moisture in concrete, make adjustments in real-time production and add water if necessary.

• Efficient mixing process. Typically, a planetary mixer is preferable. Especially for mixing concrete with low ratio of water /

cement.

6. Batching Plant

Concrete needs to be transported from concrete mixing plant to the production line. There are several

possible solutions, contain from the simplest, most economical way to the high cost and complexity way.

Options depend on:

• The size and capacity of the precast concrete plant.

• Precast concrete plant layout: is batching plant away from the production line? How many industrial

buildings to accommodate the production equipment? They are composed by how many workshops?

• Technical or logistical constraints: available spaces of concrete equipment, such as height under the

crane and the height and the position of the concrete mixer.

• Technology requirement of the precast concrete plant. Such as the precast concrete continuous

production line needs constant delivery of concrete to the production equipment and the platform of

concrete sometimes up to 150 meters long.

• Different products require different techniques, such as using semi-dry concrete and fluid concrete

for production, the delivery device they need are entirely different.

• Economic reasons: generally, the factory purchase a few machines at the beginning for saving

investment. As the business grew, the production is expanded, then procure more equipment on

transportation.

7. Concrete Delivery System

1) Simple delivery system:

Includes a hopper conveyed by a hoist.

Suitable for production line that not far

away from the batching plant.

If possible, using two hoppers will

optimize the delivery of concrete. Because

in this way, when one hopper is discharging,

another is loading, when the first complete

pouring, another is ready to pour. With one

hoist can complete the entire work cycle.

2) Enhanced delivery system:

Use hopper to move concrete to placing device. Then the placing device deliver the concrete to forming

machine(slipformer).

The placing device follows the movement of forming machine in the continuous production.

Typical tensioning device in continuous production line

Can be placed in both ends of each platform:

● Stretching rebar before forming in the tensioning ends

● Loosing the rebar when strength of concrete reaches certain level in the releasing ends

8. Stressing System

Group tensioning system

Single

Two ways for rebar(steel strand, single rebar etc.) tensioning: group tensioning and single tensioning.

Single tensioning is more common, which ensures greater accuracy as each strand is set to the same tensile strain.

Group

In natural conditions (20 ° C), concrete curing is slow. It takes

28 days to reach the final design strength (see right chart). In

this case, the PC components can’t be delivered to the

construction sites in time and bear the actual work load.

We could bring forward the production schedule, but the time

could be still pressing if the temperature is low.

The concrete strength must meets the standard before

prestress transfer. Otherwise concrete will break and steel

retraction will reduce the prestress force.

But with 24 hours, our accelerated concrete curing system

allows the compressive strength reach 60% of strength of

natural curing 28 days.

Take hollow core slab for example: generally, the strength is

near 55Mpa in natural curing for 28 days. If we lay the

components on the platform after production, covered them

with plastic film to keep the internal humidity, heat the platform

within 12 to 14 hours, can make the component strength

reach 60% of the strength of natural curing conditions for 28

days.

D. Curing Specification:

Com

pre

ssiv

e s

trength

Curing time/day

E. Flow Chart:

Cleaning platform

Forming components on platform

Brushing release agent on platform

Laying rebar on platform

Tensioning rebar on platform

Concrete batching plant

Delivery concrete to production line Transporting to construction site

Releasing tension

Cutting

Transporting to warehouse

Further nature curing

Accelerated curing (heating)

F. Project Cases

Customer is inspecting the PC element

PC panels iinstallation site

G. Configuration List

Equipment

Components Slipformer Bed Cleaner

Lifting

Devices

Concrete

Distributor

Stressing

system

Cutting machine

(Optional)

No. of devices 1 1 2 2 1 1

Personnel 5

Capacity/day 500㎡（eight working hours）

H. Sample show:

I. Application Show: