高空旋转脚手架设计与施工

结合江苏省会议中心主楼位于100m高空的坡屋面改造工程,介绍了一种新型的适用于高空挑檐坡屋面装修与改造的专用脚手架。该脚手架采用普通的扣件式钢管搭设可以直立安装,旋转倒下后与挑檐同坡度,解决了高空坡屋面挑檐脚手架搭设的难题。     

Synthesis and degradation of agar‐carbomer based hydrogels for tissue engineering applications

Hydrogels studied in this investigation, synthesized starting from agarose and Carbomer 974P, were chosen for their potential use in tissue engineering. The strong ability of hydrogels to mimic living tissues should be complemented with optimized degradation time profiles: a critical property for biomaterials but essential for the integration with target tissue. In this study, chosen hydrogels were characterized both from a rheological and a structural point of view before studying the chemistry of their degradation, which was performed by several analysis: infrared bond response [Fourier transform infrared (FT‐IR)], calorimetry [differential scanning Calorimetry (DSC)], and % mass loss. Degradation behaviors of Agar‐Carbomer hydrogels with different degrees of crosslinkers were evaluated monitoring peak shifts and thermal property changes. It was found that the amount of crosslinks heavily affect the time and the magnitude related to the process. The results indicate that the degradation rates of Agar‐Carbomer hydrogels can be controlled and tuned to adapt the hydrogel degradation kinetics for different cell housing and drug delivery applications. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Current concepts: tissue engineering and regenerative medicine applications in the ankle joint

Tissue engineering and regenerative medicine (TERM) has caused a revolution in present and future trends of medicine and surgery. In different tissues, advanced TERM approaches bring new therapeutic possibilities in general population as well as in young patients and high-level athletes, improving restoration of biological functions and rehabilitation. The mainstream components required to obtain a functional regeneration of tissues may include biodegradable scaffolds, drugs or growth factors and different cell types (either autologous or heterologous) that can be cultured in bioreactor systems (in vitro) prior to implantation into the patient. Particularly in the ankle, which is subject to many different injuries (e.g. acute, chronic, traumatic and degenerative), there is still no definitive and feasible answer to ‘conventional’ methods. This review aims to provide current concepts of TERM applications to ankle injuries under preclinical and/or clinical research applied to skin, tendon, bone and cartilage problems. A particular attention has been given to biomaterial design and scaffold processing with potential use in osteochondral ankle lesions.     

Synthesis and characterization of photopolymerizable triblocks for 3D printing tissue engineering scaffolds

While previous research on polycaprolactone (PCL) and polyethylene glycol (PEG) triblock copolymers has focused on their use as hydrogels or with conventional scaffold fabrication methods, this work concentrates on producing viable photocurable resins from synthesized triblocks for use in a layer-by-layer 3D printer. After successful synthesis of PCL-PEG-PCL and PCL-PEG-PCL-diacrylate triblocks, they were combined with (hydroxyethyl)methacrylated polyethylene glycol (PEG-HEMA) and used as biomaterials in a dynamic masking 3D printing system to fabricate porous scaffolds. Diacrylation of the polymer (PCL-PEG-PCL-DA) revealed a substantial increase in mechanical strength and resulting compound resolved the re-dissolving issue significantly during the 3D printing process. Degradation tests were carried out by incubation in phosphate-buffered saline, and both biomaterials demonstrated their degradation resistance with steady pH levels and mass loss plateauing at 20% over a sixty day timeframe. Preliminary MG63 cell culture tests on the cross-linked 3D porous structures showed no significant cytotoxicity and MTT assay data verified cell proliferation on the photocured samples after three days. As a result, end-capping PCL-PEG-PCL with acrylates demonstrated advantages over PCL-PEG-PCL while keeping similar performance in degradation and biocompatibility. Overall results from this work demonstrate the suitability of the novel triblocks for use as biomaterials in tissue engineering scaffolds.     

AUTO CAD在建筑力学计算中的应用研究

对AUTO CAD在建筑力学中几个参数的求解进行了总结,并以悬挑脚手架的力学计算为例,采用AUTO CAD精确计算了其多项参数,证实了此方法在建筑力学计算中的简单实用效果,解决了力学分析计算繁琐的问题。     

谈大兴影剧院舞台台仓满堂红脚手架搭设

针对大兴区影剧院中心舞台52 m高的脚手架的设计、搭设以及卸荷作了分析和计算,并对脚手架的安全施工进行了初步剖析,得出了该方案科学合理,具有可行性的结论,并经实践取得了理想效果。     

立交地道桥工程

结合具体工程实例,对立交地道桥工程施工技术进行了介绍,分别阐述了模板、脚手架、钢筋、混凝土等方面的施工工艺,着重对各分部工程的施工步骤及操作要点作了说明,对同类立交地道桥工程具有一定指导意义。     

浅谈承插型盘扣式钢管支架在上盖地铁车辆段工程中的施工优势

目前,国内在建筑工程应用的模板支架基本类型扣件式钢管支架、碗扣式钢管支架、门式钢管支架、数字式钢管支架、盘扣式钢管支架等。本文重点阐述盘扣式钢管支架在地铁上盖车辆段工程中的应用,同时,提出了其比传统扣件式、碗扣式钢管支架在技术、安全、成本上的优势。采用