膨脹錨栓安全埋入深度之研究-以分離式冷氣為例

本研究係探討建築物皮施作後，因其施工誤差及施作所產生之厚度，使分離式冷氣安裝時膨脹錨栓未能完全埋入結構體內，在此狀況下之試驗其抗拉強度及評估對分離式冷氣安全性之影響。在本研究檢討影響建築物皮層厚度發現，在相關施工規範及標準允許下，其厚度最厚可達40mm，因此本研究以此厚度作為分析錨栓抗拉強度基準並進行試驗，使用之錨栓為3/8英吋及1/2英吋膨脹錨栓，試驗則以不同皮層厚度下埋入膨脹錨栓，並使用混凝土工程設計規範與解說之錨栓抗拉計算公式預測其抗拉強度分析其數據。經試驗發現，3/8英吋膨脹錨栓在完全埋入混凝土時其試驗平均強度為8.38 kN，在有皮層厚度下，有效埋入深度為30mm、25mm、20mm、15mm、10mm之膨脹錨栓平均抗拉強度分別為8.19 kN、8.25 kN、8.40 kN、8.30 kN、8.17 kN，與完全埋入混凝土之抗拉強度相近，在皮層狀況下平均抗拉強度分別為8.17 kN、8.33 kN、6.83 kN、5.67 kN、2.5 kN，而1/2英吋膨脹錨栓在完全埋入混凝土其試驗平均強度為12.5kN，在有皮層厚度下，有效埋入深度為30mm、25mm、20mm、15mm、10mm之膨脹錨栓平均抗拉強度分別為12.12 kN、10.75 kN、10.29 kN、10.50 kN、10.25 kN在無皮層狀況下平均抗拉強度為11.25 kN、8.67 kN、8.33 kN、4.67 kN、1.83 kN。根據兩種不同外徑之膨脹錨栓試驗結果比較，可發現在有皮層的狀況下，膨脹錨栓埋入時，可維持在一定程度之抗拉強度，而與無皮層厚之抗拉強度比較可看出其強度有明顯差異，因此在膨脹錨栓無法完全埋入有效結構體狀況下，其部份力是由皮層所負擔，但皮層本身不具結構意義，因此本研究建議分離式冷氣安裝時，使用管長65mm以上之膨脹錨栓，使膨脹錨栓能埋入結構體內25mm以上。

關鍵字

分離式冷氣；膨脹錨栓；安全埋入深度

並列摘要

This study explored the tensile strength of the expansion bolt and its impact on the safety of split air-conditioner when the expansion bolt wasn’t completely embedded in the structure of the building during the installation due to construction error and the plaster thickness. After checking the affecting plaster thickness of the building, the study found out that according to related construction standards and regulations, the maximum plaster thickness could be 40mm. Hence, this thickness was used as the basis to analyze the tensile strength of the expansion bolts. The bolts used in this study were 3/8” and 1/2” expansion bolts. The expansion bolts were embedded at the same depth in plasters with different thickness. Anchor bolt tension formula in the Design Specifications and Commentary of Steel Reinforced Concrete Structures was used to compare and analyze the data of the test. The study found out that for 3/8” expansion bolt, the average tensile strenght was 8.38kN when it was completely embedded in the concrete; when the wall was plastered, the average tensile strenght of the expansion bolt was 12.12 kN、10.75 kN、10.29 kN、10.50 kN and 10.25 kN respectively for the effective embedment depth of 30mm、25mm、20mm、15mm and 10mm respectively, which was similar to that of the bolt being completely embedded in the concrete; when there was no plaster, the average tensile strength of the bolt was 8.17 kN、8.33 kN、6.83 kN、5.67 kN and 2.5 kN.As for 1/2” expansion bolt, the average tensile strenght was 12.5 kN when it was completely embedded in the concrete; when the wall was plastered, the average tensile strenght of the expansion bolt was 12.12 kN、10.75 kN、10.29 kN、10.50 kN and 10.25 kN respectively for the effective embedment depth of 30mm、25mm、20mm、15mm and 10mm respectively, which was similar to that of the bolt being completely embedded in the concrete; when there was no plaster, the average tensile strength of the bolt was 11.25 kN、8.67 kN、8.33 kN、4.67 kN and 1.83 kN. After the test results of two expansion bolts with different diameters were compared, it was found out that when there was plaster, if the expansion bolt was embedded, then it could remain certain level of tensile strength, there was a significant difference of tensile strength comparing with that of the bolt embedded in wall without plaster. Therefore, if the expansion bolts can’t be completely embedded in the effectitive structure of the building, part of the strength would be shared by the plaster. However, the plaster wasn’t effective structure, it is suggested that the size of anchor bolts should be over 65mm when install split air conditioners, it can make the expansion bolts embedded in structure of building depth over 25mm.

並列關鍵字

Split Air-Conditioner ； Expansion Bolt ； Safe Embedment Depth

參考文獻

[9] 李文田，面磚工程粘著材料之試驗與研究，國立臺北科技大學土木與防災研究所，碩士論文，2005

[18] 教育部重編國語辭典修訂本

[11] 朱宗信，化學黏著錨栓承受拉力與剪力作用之試驗研究，國立成功大學，土木工程研究所，碩士論文，2008

[13] 陳彥佑，外牆附置物固定端承載之研究-以分離式冷氣為例，國立台北科技大學建築與都市設計研究所，碩士論文，2011

[1] McCormac, Jack C.and Brown, Russell H,ACICommittee318ACI 318M-05 BUILDING CODE REQUIREMENTS FOR STRUCTURAL CONCRETE AND COMMENTARY, New York: John Wiley & Sons Inc,2005,pp.342-355.

國際替代計量

膨脹錨栓安全埋入深度之研究-以分離式冷氣為例

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