How to construct Fabric Formed Concrete?

‌Ⅰ. Construction preparation
1. Material preparation: According to the requirements of the construction drawings, entrust the manufacturer to produce and sew  Fabric Formed Concrete that meet the specifications. At the same time, prepare the concrete materials required for filling, including cement, sand, gravel, fly ash, admixtures, etc.
2. Machinery preparation: Prepare construction machinery such as bagging frames, small backhoes, flat vibration rollers, and filling equipment such as concrete delivery pumps.
3. Site preparation: Clean the construction site to ensure that the slope is smooth and free of debris. Repair the slope or dig mud according to the design requirements, and excavate the upper and lower anchor trenches.

Ⅱ. Slope treatment
1. Dry land slope treatment: Dig and fill the slope according to the design requirements to ensure that the slope is smooth and free of debris, and the filling area must be compacted.
2. Underwater slope treatment: For steep river banks, firstly riprap to find the slope, then lay a crushed stone leveling layer on the riprap slope to cover the block stones. The leveling layer should be generally smooth to ensure that the unevenness is less than a certain range (such as 15cm).

III.  Fabric Formed Concrete laying
1. Fabric Formed Concrete inspection: After the form bags are brought into the site, they are pre-distributed on the on-site slope according to the construction sequence and orientation. Check whether the form bags have holes, missing warps, missing wefts and other defects. If there are any, they should be repaired immediately.
2.  Fabric Formed Concrete laying: Lay the geotextile form bag units along the construction direction of the coastline and place them in the right position. The construction procedure direction is in the same direction as the unit overlap, and the filling mouth faces upward when unfolded. The construction personnel will cross the steel pipe through the preset cloth sleeve at the upper end of the form bag, and the same unit will be put on at one time.
3.  Fabric Formed Concrete fixing: After the upper end of the form bag is positioned, find the lower end of the form bag, and the construction personnel will pull the form bag to the designated boundary point and position and fix it straight. When overlapping adjacent mold bags, overlap them with overlapping cloth, and reserve a certain width of mold bags as shrinkage surplus weight (such as 5cm). The overlap between mold bags adopts positive and negative overlap, with the first construction at the bottom and the later construction at the top. Positioning is performed throughout the construction process to ensure the overlap quality.

IV. Filling concrete
1. Concrete mixing: According to the construction requirements, mix concrete that meets the strength grade (such as C20). The sand rate, gravel particle size, cement slurry volume, etc. of the mold bag concrete need to be determined according to the construction fluidity and the difficulty of filling the mold bag.
2. Preparation before filling: Before formal filling, ensure that all mold bags are wet. At the same time, the filling port operator should maintain unimpeded communication with the pump truck driver so that problems can be found and the machine can be turned on and off in time.
3. Filling process: Use a concrete delivery pump to press concrete into the mold bag. Fill from bottom to top and from both sides to the middle. During the filling process, the tensioner should be adjusted in time to keep the dynamic tension of the mold bag uniform. Construction personnel need to follow up and check. If they find poor flow, blockage, or deviation, they should deal with it in time.
4. Filling fullness: After filling the mold bag, pause for a while (such as 10 minutes), wait for the water in the mold bag to be analyzed out, and then add some filler to ensure full filling.
5. Filling port treatment: After each filling port is filled, the filling port operators cooperate with each other to slowly pull out the hose and switch to another filling port for filling. After the hose is pulled out, the filling port should be quickly tied to prevent concrete from overflowing.

V. Post-maintenance
1. Cleaning the site: After a construction unit is completed, transfer the concrete delivery pipeline and other construction tools to the next unit, and clean up the site of this unit.
2. Maintenance: After the mold bag concrete is finally set, cover it with straw bags and sprinkle water for maintenance. The maintenance time is determined according to the design requirements.

VI. In addition, the following points should be noted in the construction of  Fabric Formed Concrete:
1. Construction machinery with good performance and skilled technical workers should be equipped during construction.
2. The specific gravity of the cement mortar of the filling material needs to be controlled within a certain range (such as 1.9~2.1). Too large or too small a water-cement ratio will affect the speed and quality of filling.
3. The quality of  Fabric Formed Concrete should be determined according to the actual conditions of the construction site.

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