A Very Small 24-hour Bookstore by SZ-ARCHITECTS

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Thanks SZ-ARCHITECTS for authorizing the publication of the project on mooool. Text description provided by SZ-ARCHITECTS.

实在建筑：-小书店起源

一间很小的书店起源于南京的秦淮河边，店主的理念是把书店最大限度留给客人，给不同人在不同的时间段提供一个温暖的地方。书店的店员是4只收养的流浪猫，墙面挂满了留言明信片。店里的书最开始由店主的旧书组成，随着客人越来越多，陆续收到了捐赠的新书、旧书。

SZ-ARCHITECTS: – Origins of the Small Bookstore：

A very small bookstore began by the banks of Nanjing’s Qinhuai River. The owner’s philosophy is to leave the bookstore to its guests as much as possible, providing a warm place for different people at different times. The shop’s staff are four adopted stray cats, and the walls are covered with message postcards. The books in the store initially came from the owner’s old collection, and as guests increased, new and used books were donated one after another.

▽项目视频

-无意间的发现

项目在合柴1972创意园区。园区前身是安徽省合肥监狱，重新改造后如已成为了当地热门的文创园区。第一次来看场地时是陪同甲方看另外一个餐厅项目。现场无意瞥间路边的一栋废弃建筑，便好奇问了物业该建筑的状况和用途，得知是原监狱的看守塔，由于各种原因没有与园区一起改造荒废在了一边。随即便询问是否可以改造成为园区及附近居民服务的一家24h小书店。项目就这样启动了。

An Accidental Discovery:

The project is located in the Hechai 1972 Creative Park. The park used to be the Anhui Provincial Hefei Prison, and after renovation it has become a popular local cultural and creative park. The first time we came to see the site was when we accompanied the client to look at another restaurant project. We happened to glance at an abandoned building by the roadside and asked the property about its condition and use. We learned it was the former prison guard tower which, for various reasons, had not been renovated along with the park and had been left derelict. We immediately asked whether it could be converted into a 24-hour tiny bookstore for the park and nearby residents. That’s how the project got started.

▽建筑原始外立面 ©SZ-Architect

▽旧建筑的城市再生 ©SZ-Architect

-现场勘探

看守塔一层面积仅7平方米，二层巡逻平台可全方位俯瞰园区。同时窗户的栏杆上还保留了机枪架及监视孔，建筑本身功能非常清晰单一。

On-site Survey:

Upon entering the guard tower, the first floor measured only 7 square meters, and the second-floor patrol platform offered a panoramic view of the park. The window grilles still retained machine-gun mounts and observation ports, and the building’s original function was extremely clear and singular.

▽机枪孔& 枪托 ©SZ-Architect

-检测加固

建筑建于1997年，原始图纸已无法找到，必须重新地勘及结构检测后加固建筑主体。将原建筑4个角柱包加强角钢箍，加固二层楼板，加大屋顶混凝土梁截面，使得整体框架更为稳固。原始外墙部分使用高延性混凝土嵌缝工艺增加强度。

Testing and Reinforcement:

The building was constructed in 1997, and the original drawings could no longer be found, so new geotechnical and structural assessments were required before reinforcing the main structure. The original building’s four corner columns were wrapped with reinforced angle-steel hoops, the second-floor slab was strengthened, and the roof’s concrete beam cross-sections were enlarged, making the overall frame more robust. Parts of the original exterior walls used a high-ductility concrete joint-filling technique to increase strength.

▽建筑体块前期推导 ©MATA-OKAWA

▽手工模型鸟瞰 ©MATA-OKAWA

▽手工模型局部 ©MATA-OKAWA

▽结构轴测图 ©SZ-Architects

▽墙体拆除 ©SZ-Architect

▽建筑主体钢结构加固 ©SZ-Architect

-“吊挂”结构形式

在与结构设计事务所沟通后，为了最大限度减少新增楼荷载板同时又满足新功能，采用钢结构吊挂形式对其进行改造。

“Suspended” Structural System

After communicating with the structural design office, in order to minimize the additional load of the new floor while still meeting the new functional requirements, a steel suspended structural approach was adopted for the renovation.

▽结构生成图 ©SZ-Architect

在加固后的原屋面混凝土梁上横向架设8根C型槽钢，使得对应的二层平台投影面尺寸向外延伸，满足了双人双向通道及座位阅读区。

On the reinforced original roof concrete beams, eight C-shaped channel sections were laid transversely, extending the projected plan of the corresponding second-floor platform outward to accommodate two-way circulation for two persons abreast and a seated reading area.

▽室外钢结构凉棚 ©MATA-OKAWA

▽建筑入口细部 ©MATA-OKAWA

两根C型槽钢背靠背组合成H型后夹住纵向向下延伸的矩形实心钢吊杆，同时在原二层楼板混凝土梁的下方，从4个混凝土角柱伸出相同数量、尺寸、型号的C型槽钢夹住实心钢吊杆，使得8根槽钢及新增楼板吊挂在屋顶的钢梁上，形成了一个整体稳固的钢结构框架。利用建筑原始外墙窗洞增设了一个外挂悬挑阳台，串联室内外。

Two C-shaped channels were paired back-to-back to form an H-section that clamps rectangular solid steel hanger rods extending vertically downward. At the same time, beneath the original second-floor slab’s concrete beams, C-shaped channel sections of the same quantity, size, and model extend from the four concrete corner columns to clamp the solid steel hanger rods, so that the eight channels and the new floor slab are suspended from the roof steel beams, forming an integral and stable steel structural frame. Utilizing the original exterior wall window openings, an externally mounted cantilevered balcony was added to link the interior and exterior.

▽吊杆及钢梁节点 ©MATA-OKAWA

▽桌面吊杆及斜撑节点 ©MATA-OKAWA

▽室外悬挑阳台节点 ©MATA-OKAWA

-设计策略

由于建筑西侧有2根高压电缆线离建筑主体过近，因此通过旋转屋面后再将4个角切除，形成四叶草的形状。

Design Strategy

Because two high-voltage cable lines on the west side are too close to the building’s main body, the roof was rotated and then the four corners were trimmed, forming a four-leaf clover shape.

新增楼板在钢结构上铺设木塑地板以减少荷载。将二层原始窗台下矮墙拆除后设计成了四面书架。阅读区书桌利用主体钢结构，将脚手架的“撑”与不锈钢吊杆的“吊”结合，形成吧台桌面。建筑四个角的位置设置了可开启的移窗，打开后形成无遮挡视野。

The new floor slab uses wood–plastic composite decking laid over the steel structure to reduce load. After removing the low wall below the original second-floor window sills, bookshelves were designed on all four sides. The reading-area desks leverage the primary steel structure, combining the “propping” of scaffolding with the “suspension” of stainless-steel hanger rods. Operable sliding windows were set at the building’s four corners; when opened, they provide unobstructed views.

原始楼梯加固后用石膏板围合成室内管井，外侧作为书店留言墙。建筑南北两侧各增加1个户外平台区，分别满足咖啡售卖及书店、园区定期举办活动。

After reinforcing the original staircase, it was enclosed with gypsum board to form an interior service shaft, with the exterior serving as the bookstore’s message wall. An outdoor platform area was added to both the south and north sides, respectively accommodating coffee sales and regular events organized by the bookstore and the park.

-愿景

通过对结构、材料及功能的重新构建，将原来的监狱看守塔转变为新的场所：一间很小的书店，为周边街区的每一个人敞开。虽然现在的墙是空白的，假以时日希望小卡片依旧能挂满，因为卡片上诚挚的话语是每一个人心中的希望。

Vision

Through a reconstruction of structure, materials, and functions, the former prison guard tower has been transformed into a new place: a very small bookstore, open to everyone in the surrounding neighborhood. Although the walls are blank for now, with time we hope they will once again be covered with little cards, because the sincere words on those cards are the hope in everyone’s heart.

项目名称: 一间很小的24h书店
项目完成年份: 2025年12月
项目设计年份：2024年6月-2025年4月
建筑面积: 70m²
建筑设计/室内设计: 实在建筑设计工作室
事务所网站: https://sz-architects.net/
联络人姓名：张志坤
联络邮箱: sz-architects@outlook.com
Instagram: https://www.instagram.com/sz_architecture/
公司所在地:上海/东京
主创建筑师: 张志坤，刘悦
设计团队: 申亚宁，孔德勇
项目地址: 中国安徽省合肥市合柴1972西北门
委托方: 一间很小的书店
结构设计: iStructure结构事务所（杨笑天、吴琨营、王哲）
景观设计: 南京见植园艺有限公司
施工方: 合肥固宇建筑装饰工程有限公司
结构加固单位：中佰工程设计集团有限公司
物业：合肥滨投文化创意发展有限公司
材料：木塑地板，绿色条形瓷砖，银色波纹彩钢板，白色乳胶漆
摄影师: 大川又Mata Okawa，实在建筑
摄影师网站: https://www.mata-okawa.com/
摄影师邮箱: mata.okawa@gmail.com
视频拍摄: 实在建筑设计工作室
视频音乐: A-muzik studio

Project Name: A Very Small 24-hour Bookstore
Completion Year: Dec. 2025
Design year: Jun. 2024 – Apr. 2025
Gross Built Area: 70m²
Design Firm: SZ-Architects
Company Website: www.sz-architects.net
Contact Name: Zhikun Zhang
Contact e-mail: sz-architects@outlook.com
Instagram: https://www.instagram.com/sz_architecture/
Firm Location: Shanghai / Tokyo
Lead Architects: Zhikun Zhang, Yue Liu
Design Team: Yaning Shen, Deyong Kong
Project location: Northwest Gate, Hechai 1972, Hefei, Anhui Province, China
Clients: A Very Small Bookstore
Structural Design: iStructure Design & Consulting Co.,Ltd (Xiaotian Yang, Kunying Wu, Zhe Wang)
Landscape: Nanjing Jianzhi Horticulture Co., Ltd.
Contractor: Hefei Guyu Construction Decoration Engineering Co., Ltd.
Structural Reinforcement: Zhongbai Engineering Design Group Co., Ltd.
Property Management: Hefei Bintou Cultural and Creative Development Co., Ltd.
Material: Wood-plastic composite flooring, green strip tiles, silver corrugated colour-coated steel sheets, white latex paint
Photo credits: Mata Okawa, SZ-Architects
Photographer’s website: https://www.mata-okawa.com/
Photographer’s e-mail: mata.okawa@gmail.com
Video production: SZ-Architects
Video music: A-muzik studio