Installation Method for Plastic Drainage Boards

Based on the design and construction drawings, the plastic drainage panels are of Type A, arranged in a square pattern with a spacing of 1.0 meters. The layout of the plastic drainage panels is as follows:

Survey and Stake Out

The construction of the plug-in adopts the unit block method, with construction divided by the construction area. Regional construction facilitates the arrangement of locations and machinery operations, while avoiding mutual interference.

Utilizing the polar coordinate method with a total station to set out the control boundary lines for each unit.

Based on the drawings, calculate the coordinates of the perimeter outside the plate area, set up the total station for placement, drive in wooden stakes, and mark the points with red paint and assign numbers.

② Within the unit, the positions of each plug-in are measured using a steel ruler, with distances marked along the inner and outer edges. White lime powder is used for clear marking, and numbering and sequencing of the board positions are compiled.

Aircraft Assembly and Positioning

Machinery has been transported to the construction site and is being assembled individually. The assembly process involves first assembling the slide plate, base, and gantry. The gantry is then lifted and secured using a winch and pulley. Next, the tower is assembled and lifted in the same manner, followed by the installation of the winch and vibration hammer after the tower is upright. The winch is mounted and secured on the back of the frame, and then the moving parts are assembled properly. Finally, the pipe and vibration hammer are connected and secured, completing the assembly of the slide plate machine. The slide plate machine moves along the gantry on the designed slide plate cross-section, positioning itself for the slide plate operation.

④ Install drainage boards

The entry equipment has been installed, and the length of the pipes has been set according to the design requirements for the depth of the inserts. Markings for the depth of the drainage panels have been made on the pipes and the tower frame. The drainage panels are inserted into the interior of the sleeve through the sleeve's nozzle, secured to the bottom of the sleeve with pins. While pulling the drainage panels tight, they are connected together by the friction between the panels and the pins. When lifted, the pins are pulled out from the sleeve and the drainage panel's end, removing the sleeve, while the drainage panels remain in place in the foundation due to soil pressure.

Submerged Pipe Insert Plate

Lay sleepers and tracks, then move the machinery into the site.

② Roll the drainage panel into a cylinder and guide it into the rod through the pulley on the gate frame.

Before inserting the plate, check the tube's verticality. If it does not meet the requirements, adjust the gate frame position forward and backward, and the tube position left and right to ensure the plate's verticality is within 1.5%.

④ Lead the drainage board out from the end of the insertion rod, fold it back, and clamp a short rebar (inserted into the pile position during pile layout) in place. Secure it with a nailer.

Tighten the drainage panel and align the insertion rod with the pile position.

⑥ Activating the vibration will insert the rod into the ground.

⑦ Clearly mark the design depth on the casing with red paint. After reaching the design depth (previously marked with red paint on the insertion rod), pull out the insertion rod. The drainage board is then anchored at the bottom of the hole with short steel bars.

⑧ Cut and bury the drainage board 30cm above the sand cushion layer into the sand.

Move to the next pier position.

Plug-in requirements:

During the insertion process of plastic drainage panels into the foundation, ensure the board does not warp, the permeable film remains intact and unpolluted. The bottom of the board should have a reliable anchoring method to prevent it from being pulled out when the protective sleeve is removed.

(2) After the plastic drainage panels are inserted, the excess parts exposed outside the matting should be promptly cut off. Additionally, protect the drainage panels to prevent damage due to the movement of the insertion machine or vehicle traffic, which may reduce the drainage effectiveness.

(3) During the drainage board insertion process, attention should be given to whether the board is truly inserted into the soil during insertion, or if it is pulled back up during the removal of the tube (spindle). It is advisable to regularly monitor the consumption of the plastic boards within the reel (or use an automatic recording device). The tube should only be removed once the drainage board has reached the designed soil depth.

(4) In the event of encountering underground obstructions that prevent further drilling or cause the borehole to tilt (exceeding permissible deviation), the hole should be abandoned, and the pipe should be pulled out and repositioned (approximately 45 cm away), then re-drill the drainage hole.

Drainage holes should be driven using the predetermined vibration pressure method, continuing until the design depth is reached; heavy hammer compaction is not permitted.

(6) Maintain the verticality of the drainage holes during the injection process, with the vertical deviation controlled at ≤1.5-2cm/m (1.5%-2%) of the injection depth.

The flat position of the drainage holes should be drilled at the spacing required by the design, with the general position deviation not exceeding 5 cm.

(8) Maintain the continuity of the drainage board insertion into the soil; reinsert immediately upon discovery of any fractures.

When installing plastic drainage boards, the spacing dimensions should be less than 15 cm, and the length protruding from the sand cushion layer should be controlled at 20 cm.

Enhanced Casing and Reel Measurement

Once the design depth of the drainage board is confirmed, the casing can be lifted. At this point, observe the insertion hole of the casing. If the drainage board does not move relative to the casing, it indicates that the drainage board has been pulled back. Continue to lift the casing until the drainage board moves and is drawn into the casing. Measure the height of the casing lifted at this time, which is the amount of the drainage board being pulled back. If there is extensive pulling back, consider changing the pin design to reduce friction between the pin and the drainage board when lifting the casing, and increase the contact area between the bottom of the drainage board and the soil to minimize the occurrence of pulling back.

Cut Plastic Drainage Board

When raising the casing, once the bottom of the casing is 50cm above the sand surface, manually cut the drainage board from the bottom of the casing, ensuring the exposed length of the drainage board is over 20cm. Then, bend the remaining drainage board head and insert it into the pipe opening.

Inspect

The main inspection focuses on the quality standards requirements. If any item fails, a new drainage board must be installed within a 20cm radius of the non-compliant drainage board position, and re-inspected until it passes. Once qualified, the plate positioning machine is moved to the next position. Construction records are kept for each board as they are installed.

Staff Allocation

To maximize the efficiency and output of our plastic plate machine, during peak construction periods, we operate on a two-shift system per machine per day. This includes one operator per shift, two recorders and strap cutters per shift, and one person per shift for cleaning away soil and burying exposed drainage plates.