Insinööritoimisto Laaturakenne Oy specialises in structural and precast unit design, with a focus on concrete construction. We provide structural and precast unit expertise for business areas such as industrial, residential and office construction. In addition, we engage in structural design for preliminary tenders or draft designs, from selection of single dimensions to complete framework solutions.

Newest references

Location	Town/city	Scope of project	Design sector
As Oy Kuopion Kaijankulma	Kuopio		Structural and precast unit design
Autoliike J. Rinta-Jouppi Oy	Kuopio	1238krs m2	Structural and precast unit design
Karjarakennus Kaarakainen	Iisalmi	3047m2, 21790m3	Precast unit design

One of Insinööritoimisto Laaturakenne Oy’s specialisms is reinforcement design for prestressed concrete structures. Reinforcement design covers the design of all types of prestressed structures such as hollow core, shell, TT and HTT slabs, standard I and HI beams, concrete-on-concrete composite structures and, of course, reinforced concrete products in general. We most often create designs for precast unit manufacturers, or as consultants for other design agencies and organisations.

Newest references

Location	Town/city	Scope of project	Design sector
As Oy Turun Truumanni	Turku	3906krs-m2, 13030m3
Lapin liikuntahalli	Lappi	994krs-m2, 8000m3
Merikeskus Vellamo	Kotka	14366m2, 118000m3	Reinforcement design for JK beams and hollow core and shell slabs

Insinööritoimisto Laaturakenne Oy also offers structural design for renovations. This generally involves modifications or extensions that require the analysis of old structures due to changing loads or other structural changes. Computational analysis of old structures may be necessary when their carrying capacity is in doubt after the detection of possible minor damage, or when taking preventive measures to ensure that the structure continues to function properly.

In many cases, ensuring the durability and usability of structures also creates a need for consulting, ranging from site visits to various structural analyses. A typical example would the inspection of old suspended ceiling structures.

Newest references

Location	Town/city	Scope of project	Design sector
As Oy Pielanranta	Pielavesi		Structural design of lift shafts
Luistelijantie 1-3	Kuopio		Design of roof renovation
As Oy Kuopion Kotipesä	Kuopio		Structural design of lift shafts

Dimensioning software for prestressed concrete structures
Dimensioning software for prestressed concrete cross-section
Dimensioning software for reinforced concrete beam
Dimensioning software for reinforced concrete cross-section
Saving of input data
Price list 1

Concrete structure software

Developed with a focus on professional reinforcement design, these software products are very fast and efficient to use. They provide plenty of dimensioning data and can be used to model a wide variety of structures. They have been developed using the Visual Basic/Visual Studio software and run in standard Windows user environments. The products are described in more detail below.

The software products have a wide range of users. They have mainly been used to design reinforcements for reinforced and prestressed concrete structures on behalf of precast unit plants, and in dimensioning for tenders. Users include companies such as Parma Betonila, Lujabetoni Oy, Insinööritoimisto SRT Oy and SWECO.

Dimensioning software for prestressed concrete structures

JbPalkki B4 1.2 (version 16 February 2008) (Calculation according to RakMK B4)

JbPalkki EC2 3.0 (Version 14 December 2019) (Calculation according to Eurocode 2)

JbPalkki EC2 2019 PRO (Version 14 December 2019) (Calculation according to Eurocode 2) NEW SOFTWARE!

 

Calculation principles used in software

Calculations are based on the application of plasticity theory. The shape of the compression zone is based on a parabola equation (the calculation divides the compression surface into 50 equally high ‘slices’) and is not therefore replaced by a traditional rectangular stress distribution. Otherwise, RakMK B4/Eurocode 2 or other generally accepted calculation methods are generally applied.

During bending, the software obtains the required compression zone height corresponding to the stress state and reinforcement. The height of the compression zone, compression of the concrete, and strain on the pre-stressed and concrete steel are based on the equilibrium state corresponding to the degree of reinforcement when failure state has been reached.

Cutting capacity is calculated according to RakMK B4/Eurocode 2.

Conventional prestressed concrete structures without composite effect.

The software can be used to model a wide variety of prestressed concrete structures. Here is a list of some of the most common prestressed concrete products for which the software performs calculations:

Rectangular and inverted tee beams. The beams can be of constant height, gable roof beams, one-sided gable roof beams, or beams whose height increases in steps (e.g. a beam with a notch in the upper surface)

• I and HI beams
• TT and HTT slabs
• Hollow core slabs, bathroom hollow core slabs
• Solid slabs.
• Prestressed wind columns without a vertical load

Composite structures

All of the above structures can also be counted as composite structures, where the precast unit is usually cast at the factory and then cast-in-place. Composite casting may be done above or below the unit’s upper surface, or both simultaneously. Composite casting can be done along the entire, or only part of, the unit. Composite casting can be either uniformly wide, or the width can change linearly, developing to full width at a selected ‘gradient’ e.g. 1:3.

Composite structures can be modelled either unsupported or supported. The load usually comprises the top slab’s weight on top of the unit. In such a case, the software takes account of issues such as the calculation of edge stresses and deflections, even when using the summation principle to calculate stresses during composite casting. If the structure is supported, the software interprets the load during composite casting as equal to the weight of the unit only.

Dimensioning software for prestressed concrete cross-section

JbPoikkileikkaus B4 1.2 (version 12 January 2008)

JbPoikkileikkaus EC2 3.0 (version 14 December 2019)

The software uses the same calculation module as JbPalkki. It can be used to check one cross-section. A cross-section and reinforcement data are input. Strength quantities can be calculated by other software or manually. Strength quantities calculated by other means are input, after which the software will dimension the cross-section in question. The software can also be used to calculate composite structures.

Dimensioning software for reinforced concrete

TbPalkki B4 1.1 (version 17 October 2009)

TbPalkki EC2 3.0 (version 14 December 2019)

This software has similar content to JbPalkki. However, it is slightly more minimal and basic when calculating reinforced concrete structures. It can be used to calculate structures of constant height, where the cross section does not change. In such a case, the cross-sectional shape is modelled as in the JbPalkki software. It is fairly useful software for most reinforced concrete structures when dimensioning without the composite effect.

Dimensioning software for reinforced concrete cross-section

TbPoikkileikkaus B4 1.2 (version 17 October 2009)

TbPoikkileikkaus EC2 3.0 (version 14 December 2019)

The software uses the same calculation module as TbPalkki. It can be used to check one cross-section. A cross-section and reinforcement data are input. Strength quantities can be calculated by other software or manually. Strength quantities calculated by other means are input, after which the software will dimension the cross-section in question.

Saving of input data

All input values entered into software can be saved as a text file (*.txt). This feature makes use of the software markedly more efficient.

Price list 1

Software	Activation fee *)	Licence rental price
JbPalkki EC2 PRO	60 €	50 €/month
JbPalkki EC2	60 €	35 €/month
JbPoikkileikkaus EC2	60 €	15 €/month
TbPalkki EC2	60 €	30 €/month
TbPoikkileikkaus EC2	60 €	15€/month
JbPalkki B4	60 €	20 €/month
JbPoikkileikkaus B4	60 €	10 €/month
TbPalkki B4	60 €	15 €/month
TbPoikkileikkaus B4	60 €	10 €/month
USB-software key 56€	(only in exceptional cases)	no monthly fee

Price is exclusive of VAT/1 user.

All EC2 software as PRO package €120/user + €85/month.

All EC2 software as packages €120/user + €70/month.

All B4 software as packages €120/user + €40/month.

Upgrade of JbPalkki EC2 to JbPalkki EC2 Pro version €0 (switch to rental licence).

Ask for a quote when buying several software products!

Laaturakenne reserves all rights to change its product prices!

B4 = calculation according to RakMK B4.

EC2 = calculation according to Eurocode 2 and Finnish national annex.

Find out your own software versions and ask for the latest updates!

Spreadsheets

It has been developed using the Open Office Calc software and runs in standard Windows environments. The software products have been developed for professional use. However, they are easy to use and intuitive. The software products are described in more detail below.

The software products have a wide range of users. They have mainly been used to design reinforcements for reinforced and prestressed concrete structures on behalf of precast unit plants, and in dimensioning for tenders. Typical users are designers working for precast unit factories and structural and precast unit designers engaged in the general design of concrete structures.

The software products work with Open Office Calc. Open Office software is freely downloadable from the Internet at http://en.openoffice.org/. (The software may also be compatible with Microsoft Excel, but we cannot guarantee that they will work in exactly the same way with Open Office in all situations.)

Dimensioning software for hollow core slab cutting capacity

Hollow core slab EC2

This software calculates the cutting capacity of a hollow core slab with non-settling support, on the basis of the input data provided. The calculation is based on the Eurocode. The calculation takes account of the Finnish national annexes and product standard SFS-EN 1168 + A1 for hollow core slabs.

Dimensioning software for the anchorage length of prestressed strands

Anchorage of prestressed strands EC2

This software calculates the anchorage length of a prestressed strand based on the input data. The calculation is based on the Eurocode. Finnish national annexes have been taken into account in calculations.

Price list 2

Hollow core slab EC2	request a quote
Anchorage of prestressed strands EC2	request a quote

Insinööritoimisto Laaturakenne Oy offers product development services including the preparation of various diagrams, product sheets, and installation and design instructions. Product development services are often needed to bring new products to market or make older products more usable.

An example of a typical product development project would be the compilation of technical documentation related to the CE marking required by the Eurocode.

New References

Location	Town/city	Scope of project	Design sector
Ansion Sementtivalimo Oy hollow core slabs	Paimio		Calculation material for CE marking of hollow core slabs
Betset Oy hollow core slabs   Mikkelin Betoni Oy	Kyyjärvi   Vierumäki		Calculation material for CE marking of hollow core slabs Product development for lift shaft system
Solar Glass Oy/fire compartments	Kuopio		Research and development