“Lumber 4″是一栋六层的商业办公建筑，向内退的底部提供商业空间，上面的五层则是办公专用空间。

“Lumber 4” is a commercial and office building spanning six floors. A recessed ground floor constitutes the commercial level, with the five floors above dedicated to office spaces.

▼项目概览，Overall view © Kyrre Sundal

▼入口立面，Facade of the entrance © Kyrre Sundal

本项目使用了厚木结构，梁和柱结构均由胶合木制成。室内地板采用了CLT和混凝土复合结构，这种材质的选择能够使地板结构纤薄高效，满足大跨度的空间需求，并符合防火和隔音的要求。

The structure is composed of a masstimber construction with columns and beams made of glued laminated timber. The floors are constructed using a composite structure of CLT and concrete, creating a slim and efficient floor system that spans long distances while also addressing fire and acoustic requirements.

▼立面弯曲的松木预制板，The prefabricated curved wooden elements in pine © Kyrre Sundal

▼立面细部，Details of the facade © Kyrre Sundal

建筑底层对角线的结构便于周围车辆的通行。内部相邻的交通核有利于建筑横向的稳定性和内部楼层的相互连接。

Diagonals on the ground floor facilitate better vehicular access around the building. The existing communication core from adjacent building phases contributes to lateral stability and access to the office floors.

▼底部结构，Bottom structure © ChristofferImislund

设计者在建筑的三层和四层之间设置了一个中庭，这里的楼梯厚木打造，木质元素在室内的存在感很强，并且能够使室内冬暖夏凉。

Between the third and fourth floors, an atrium with an internal staircase made of masstimber has been introduced. Wood elements are prominently displayed in the interior, providing warmth in winter and cooling in summer.

▼中庭，Atrium © Kyrre Sundal

▼办公空间，Office area © Kyrre Sundal

建筑的立面由弯曲的松木预制板打造，并涂有绿色的油漆。由于屋檐是平直的结构，所以在这些木板上能形成弯曲的阴影，随着时间的推移，阴影下的油漆会被风化，导致立面的颜色发生改变，形成较为明亮和较暗的部分。项目的整个建造过程使用了木纤维作为绝缘材料，覆层则使用了经过火处理过的松木材料。

The facade is composed of prefabricated curved wooden elements in pine, treated with green paint. The eaves above the curved elements are straight, creating a curved shadow on the panel. Over time, the paint under the shadow will weather, leading to a changing facade with lighter and darker curved sections. The insulation used throughout is wood fiber. The cladding consists of fire-treated pine.

▼巨大的落地窗提供自然光线，The large floor-to-ceiling windows © Kyrre Sundal

建筑所有的承重结构都被暴露在外面，设计者在墙面上使用了白色的云杉板，在隐蔽的设备去和会议室安装了木质隔音板。裸露在外面的管道被涂成了浅米色。大型落地窗为室内提供了充足的自然光线，人们在这里可以欣赏到室外的景色。

All load-bearing structures are exposed, and exterior walls are clad with white-pigmented spruce panels. Wood wool acoustic panels are used in concealed service areas and meeting rooms. Visible conduits are painted in a light beige color. The large floor-to-ceiling windows open up to the view and provide ample natural light.

▼浅色的内饰，Light colored interior © ChristofferImislund

本项目的施工时间创造了一项纪录，从详细规划到施工完成仅用了12个月。 “Lumber 4”项目证明，与相同技术标准的混凝土和钢结构相比，木结构建筑是具有竞争力的。该建筑从竣工后到现在，90%的空间已被出租。Oslotre是本项目的建筑师、室内建筑师和木结构工程师。

The construction of the building was completed in record time, with detailed planning and construction taking only 12 months. “Lumber 4” has demonstrated that it’s possible to construct competitive timber buildings when compared to same technical standard concrete and steel structures. The building was 90% leased upon completion. Oslotre served as the architect, interior architect, and timber structural engineer for the project.

▼剖面图，section © Oslotre architects

Building category: Office Project size: 3890 m2 Materials used: CLT and Glulam construction Delivery from Oslotre: Architecture and Timber Design Status: Completed