Glulam Beam machining

Service

From your engineered designs we can produce almost anything in terms of machining Glulam. From end shaping to slotting and pre-drilling, beams can be sent to site ready for use on arrival.

Straight Beams

Straight beams are produced with a constant cross section without camber.

Lilleheden A/S manufactures standard beams and columns to GL 30c produced to EN14080 : 2013.

Duo-Pitch and Mono-Pitch Beams

Pitched beams are mainly used as roof beams where a horizontal bottom edge is required but the top must follow the roof surface, - a slope of up to about 5°.
Beam shape ensures the correct pitch without building up to the ridge.

Pitched Cambered Beams

Pitched Cambered Beams are similar to Duo-Pitched Beams but with a curved underside. They are used where there is a steeper roof pitch of approximately 5-15°.  To minimise tensile stress perpendicular to the glue lines, the radius of curvature is generally fairly large.  To assist in transport, it is possible to have the top section delivered loose and screwed into place on site.

Tied Rafters

When the deformation of beams results in large horizontal movements at the supports, they can be tied with timber beams or steel rods, connecting the supports and minimising horizontal movement.

Introducing the ties directs forces in a favourable direction for the Glulam and can result in smaller section sizes and, in the case of pitched cambered beams, allow a tighter radius of curvature,

Steel tie rods are often formed with adjustable connections making allowance for installation tolerance.

In large structures it may be necessary to tighten the tie bar and bolted joints when the structure has been in use for some time.

Trussed Frames

Long span trusses are often made entirely of Glulam members.  Shorter span trusses may have the top and bottom chords in Glulam with diagonal members in solid timber.

Trusses with a parabolic top chord can achieve very economical solutions for curved roofs.  The forces in the diagonal members are small and connections can be simple.

Portal Frame Structures

Glulam frame structures are widely used for buildings - from industrial and agricultural units to sports halls. They are normally designed as 3- pinned frames, i.e. of two parts that are joined with a bracket at the top (ridge).  The common span range is 10 to 35m, but larger spans are possible.  The frame spacing is generally 3-6m, preferably as large as possible.

Frame with curved haunch

The type of frame is very economical and used to be the most common type of frame in laminated wood.  The roof surface can follow frame curve or continue a straight line to the vertical wall intersection, when the frame is supplied with post and rafter infills.

Frame with sharp haunch

The posts and rafters of the frame can be assembled by means of steel brackets using dowels or bolts, or nailed plywood gussets for industrial applications.

As an alternative, paired rafters or posts can be used and the lapping members connected by bolts, most economically when set in a circular formation.

It is also possible to form corner joints as large glued finger-joints.  Where delivery constraints allow, this is the most common solution manufactured at Lilleheden A/S.

Frame with braced haunch

Made entirely of straight beams, makes it particularly advantageous seen from a financial standpoint. The corner braces take up a little space inside the building, but the void produced is often advantageously used as a run for services.

Arches

Glulam arches are usually designed as 3-pinned but by introducing moment connections can also be formed as rigid 2- pinned. Large arches may be assembled from three or more parts.

Arches can be formed with any shape but are often radial or parabolic.

Tied Arches

In Tied Arches, the loads are mainly in tension and compression, similar to Trussed Frames.  Tied Arches usually have fewer connections and forces can be transferred in bearing.  However, Tied Arches are more sensitive to unbalanced loading than Trussed Frames.

Pyramid Structures

Pyramid structures are becoming more and more prevalent following the current trend to have high ceilings.  Glulam is used as the principal hip members, connected to a central steel bracket or a compression ring.  It can also be used to form a tie system to resolve the horizontal forces at the base of the pyramid.