The installation of a rubber dam involves a systematic, multi-stage process that combines civil engi

1. Pre-Installation Preparation

• Site Clearing and Foundation Treatment

• Clear the dam site of debris, vegetation, and soft soil, and level the construction area.

• Conduct foundation bearing capacity tests; for weak foundations, adopt reinforcement measures (e.g., gravel cushion, cement mixing piles) to meet design requirements for bearing capacity and anti-settlement performance.

• Excavate foundation trenches for the dam abutment, bottom sill, and anchor structures according to design drawings, and verify the dimensions and elevation of the trench to ensure alignment with construction benchmarks.

• Material Inspection

• Check the quality of the rubber membrane (core component of the rubber dam): verify certificates of conformity, check for surface cracks, bubbles, or thickness deviations, and confirm that the rubber material’s physical and mechanical properties (tensile strength, elongation at break, aging resistance) meet standards (e.g., GB/T 22651-2021 in China or relevant international standards).

• Inspect supporting components: check the integrity and corrosion resistance of anchor bolts, clamping plates, inflation/deflation (or water filling/draining) pipelines, and control valves; verify the accuracy of metal parts’ dimensions and installation positions.

2. Foundation and Abutment Construction

• Bottom Sill and Abutment Pouring

• Install formwork for the bottom sill (dam bed) and abutment, and place steel reinforcement according to design specifications (reinforcement spacing and protective layer thickness must meet requirements).

• Pour concrete (typically C30 or higher strength grade) and perform vibration compaction to ensure no honeycombing or pitting. After initial setting, conduct proper curing to reach the design strength (usually 28-day strength).

• Embed anchor bolt sleeves, pipeline reserved holes, and sealing grooves in the concrete structure during pouring, ensuring precise positioning to avoid rework.

• Waterproof and Anti-seepage Treatment

• Apply waterproof coating (e.g., polyurethane waterproof paint) to the surface of the bottom sill and abutment contact area with the rubber membrane, and lay waterproof geotextile if required by design to prevent seepage damage to the foundation.

3. Rubber Membrane Installation

• Membrane Unfolding and Positioning

• Transport the rubber membrane to the site, unfold it on a clean, flat cushion (to avoid scratching), and check for damage again.

• Position the membrane according to the centerline and elevation benchmarks, aligning its edge with the anchor grooves on the bottom sill and abutment to ensure no offset or torsion.

• Anchoring and Fixing

• Bottom Anchoring: Place the bottom edge of the rubber membrane into the reserved anchor groove of the bottom sill, lay the steel clamping plate on top, pass the anchor bolt through the plate and membrane, and tighten the nut symmetrically (use a torque wrench to control preload and avoid over-tightening that damages the membrane or under-tightening that causes water leakage).

• Abutment Anchoring: Extend the side edge of the membrane into the abutment anchor groove, fix it with clamping plates and bolts in segments, and ensure tight contact between the membrane and the abutment to eliminate gaps.

• For large-span rubber dams, install in sections and bond the joints of the rubber membrane with special adhesive (or vulcanize on-site) to ensure joint strength and sealing (joint strength should not be less than 80% of the membrane’s base material strength).

4. Installation of Auxiliary Systems

• Inflation/Water Filling System

• Install inflation (air-filled rubber dam) or water filling (water-filled rubber dam) pipelines, connect air compressors/water pumps and control valves, and arrange pressure gauges and flow meters to monitor the internal pressure of the dam bag in real time.

• Ensure the pipeline connection is sealed (use flange or threaded connection with sealing gaskets) to prevent air/water leakage.

• Drainage and Decompression System

• Install drainage pipes at the bottom of the dam bag and decompression valves on the abutment to discharge accumulated water or excess air in time and avoid damage to the dam bag from overpressure or backwater.

• Monitoring and Control System

• Install displacement sensors (to monitor dam bag deformation), pressure sensors (to monitor internal pressure), and water level gauges (to monitor upstream and downstream water levels), and connect them to the central control system to realize automatic monitoring and remote control.

5. Sealing Test and Commissioning

• Sealing Performance Test

• Conduct a low-pressure inflation/water filling test (usually 50% of the design pressure) and maintain pressure for 24–48 hours to check for leakage at the anchor points, joints, and pipeline connections. If leakage is found, re-tighten the bolts or repair the joints.

• Full-Pressure Commissioning

• Gradually increase the internal pressure of the dam bag to the design working pressure, observe the shape of the dam bag (it should be evenly bulged without local deformation or wrinkling), and verify that the upstream and downstream water levels and dam body stability meet design expectations.

• Perform multiple inflation/deflation (or filling/draining) cycles to test the reliability of the control system and the durability of the dam bag.

6. Post-Installation Acceptance and Protection

• Acceptance Inspection

• Conduct overall acceptance of the project, including checking the installation quality of the dam body, the operation of auxiliary systems, and the completion of technical data (e.g., material test reports, construction records, test data). Only after passing acceptance can the dam be put into use.

• Daily Protection

• Clean floating debris upstream of the dam in a timely manner to prevent sharp objects from scratching the rubber membrane; set up anti-collision facilities if there is a risk of vessel impact.

• Regularly inspect the aging, cracking, or detachment of the membrane, and maintain the inflation/water filling system and control valves to ensure long-term stable operation.