网页"Hand-dug caisson" is defined in Section 2(1) of the Buildings Ordinance as any foundation or earth-retaining structure, or part thereof, the construction of which includes the excavation of a shaft in the ground by means of digging carried out by any person inside the shaft with or without the aid of machine tools.
Deep Shaft Excavation: Design, Construction, and Their Challenges
网页2022年2月28日 · Such construction method, otherwise, also known as hand-dug caisson, has been documented by Allenby et al. , Yee et al. , and Yee and is usually effective when the founding shaft level is in weathered rocks. The main advantage of this construction method is that the completed shaft remains strut-free …
网页Hand-dug caissons are structural elements typically adopted as foundation or earth retaining system and are excavated using hand tools in stages with depths of up to 1 meter, depending on the competency of the ground. Caisson pile construction involves digging or dredging of materials from the opened hole in stages
Hand-dug Caisson excavation in Hong Kong – worst recent construction ...
网页Husband and wife teams constructing large diameter, hand dug piles, known as caissons were common on most large construction sites often excavated in very difficult conditions. They were hand dug from the top down as far as 40 metres or more, with the husband excavating and concreting the pile perimeter walls in one metre sections.
网页This technical circular (TC) provides the departmental procedures to be adopted for public works projects undertaken by the Civil Engineering and Development Department (CEDD) involving the use of hand-dug caissons (HDC), and the respective approval process to seek permission for their use.
网页4.4.3 Hand-dug Caissons 62 4.5 SPECIAL PILE TYPES 65 4.5.1 General 65 4.5.2 Shaft- and Base-grouted Piles 65 4.5.3 Jacked Piles 66 4.5.4 Composite Piles 67 5. CHOICE OF PILE TYPE AND DESIGN RESPONSIBILITY 69 5.1 GENERAL 69 5.2 FACTORS TO BE CONSIDERED IN CHOICE OF PILE TYPE 69
网页Where hand-dug caissons are permitted, consideration should be given to the following precautionary measures and preventive works, as appropriate : pre-grouting around each hand-dug caisson to increase the shear strength and …
网页Restrictions on the Use of Hand-dug Caissons in Public Works. Introduction. This circular provides the departmental procedures to be adopted for any proposals by CEDD staff and consultants to incorporate hand-dug caissons (HDC) in public works projects, and the approval process to be followed to seek permission for their use. Effective Date. 2.
HAND-DUG CAISSONS IN HONG KONG - Transport Research …
网页1993年6月1日 · HAND-DUG CAISSONS IN HONG KONG. This technical note describes the hand excavation techniques of caisson construction that is used very widely in Hong Kong. The note's aims are to: (1) introduce the details of this technique, which is not often used outside Hong Kong; (2) explain why it is technically viable; (3) describe its applications; (4 ...
网页well-instrumented hand-dug caisson to shed a light on the uplift behavior of caisson within Taichung gravel. It is found that ultimate side friction of this caisson is about 25% higher than the maximum values stipulated in local design code, and the mobilized side friction is likely a function of the overburden pressure.