I. Overview of the Project
The concrete retaining wall of Maosenyun Shuihuadu 1# building is mixed with C20.
Second, the construction sequence
Binding wall reinforcement → installing internal and external wall formwork → pouring wall concrete → curing →20 thick 1;
2.5 cement mortar mixed with 5% waterproof powder leveling -—SBS waterproof coiled material.
Third, the main component construction scheme
(1) After the concrete retaining wall is maintained, it shall be leveled to 20 thickness with 1: 2.5 cement mortar mixed with 5% waterproof powder.
(2) SBS waterproofing membrane construction.
1, construction preparation
1) materials and requirements:
(1)SBS waterproofing membrane has a width greater than 1M, a length of 10M and a thickness of 3MM.
(2) Supporting materials:
(1) neoprene asphalt adhesive: used for joint bonding.
② Rubber asphalt emulsion: used for the bonding of coiled materials.
③ Rubber asphalt caulking paste: used for caulking sealing of special parts.
4 gasoline, biphenyl, etc. : Used for cleaning tools and contaminated parts.
2) Operating conditions:
(1) Review the drawings before construction and make technical disclosure. Underground waterproofing works must be constructed by professionals, and operators must hold relevant certificates.
(2) Before the waterproof layer is painted with primer (cold primer), the surface at the grass-roots level shall be cleaned.
(3) The construction materials are flammable, and corresponding fire-fighting equipment should be prepared.
2, the operation process
1) base treatment → brush base treatment → spread additional layer → hot melt coil → hot melt edge sealing.
2) Base treatment: Clean up the qualified base before construction.
3) Brush the base treatment agent: brush a piece of chloroprene rubber asphalt adhesive diluted with gasoline on the base surface, which should be uniform and impermeable.
4) Laying additional layer: laying an additional layer of coiled material at the corner of yin and yang. According to the specifications and design requirements, cut the pulp roll into corresponding shapes for laying.
5) Paving the coiled material: cut the SBS waterproof coiled material according to the paving length and roll it for later use. When working, use No.30 pipe to thread the coiled coil into the core. When the two ends of the coil are aligned at the paving starting point, light the gasoline blowtorch or use a flame spray gun to heat the joint between the base and the coil. The distance between the spray gun and the heating surface is about 300 mm When the asphalt of the coil just melts, roll the two ends of the coil forward slowly and lay it evenly.
6) Hot-melt edge sealing: use a spray gun to heat the lap seam of the coil, press it until the edge is extruded, and stick asphalt. Rubber asphalt caulking paste is embedded at the end of the coil.
Fourth, quality standards.
1, master project
(1) The specifications, performance and mixture ratio of waterproof powder and SBS waterproofing membrane should be adopted according to the design and relevant standards, and have qualified factory certificates.
(2) The detailed practices of special parts of coiled material waterproof layer must meet the design requirements and the provisions of construction and acceptance specifications.
(3) The lap width of layered joints shall conform to the regulations, and the ends shall be firmly embedded.
(4) Bonding shall be firm, and there shall be no defects such as hollowing, breakage, slippage, warping, blistering and warping.
Five, should pay attention to the quality problems
1. Poor lap joint of coiled material: the lap joint form and the lap joint width of long side and short side are too small, the joint is not tightly bonded, and the joint is damaged and empty; During the construction operation, the standard line should be played according to the procedure to meet the specifications of the coil. In operation, the shop is stuck in alignment, so that the long side of the coil lap is not less than 100MM, and the short side is not less than150 mm. ..
2. Empty drum: the base of the coil is wet, uneven and unclean, which leads to cavitation and empty drum between the base and the coil; When laying, the exhaust is not complete, and the air is trapped, which will also make the coil empty; During construction, the Peking Opera at the grass-roots level shall be fully dried and the coiled material shall be uniformly compacted.
3. Leakage: the additional layer should be carefully operated during construction; Protect the coil and meet the width requirements.
Degree requirements, to ensure the construction quality of special parts.
Six, finished product protection
There is no protective layer in this project, so aluminum foil reflective film coil should be used for paving.