The wood mold is supported and the concrete is poured around the wood mold. After the concrete is finally set, the pre-weared D4mm steel bars are first fastened to the crowbar, and then the mold is lifted upwards. Due to the swelling of the wood and the pressure of the atmosphere, the wooden mold is tightly sucked, the D4mm steel bar is pulled off, and only a part is pulled out, and there is still a small amount of residue.
The wood mold is supported and the concrete is poured around the wood mold. After the concrete is finally set, the pre-weared D4mm steel bars are first fastened to the crowbar, and then the mold is lifted upwards. Due to the water swelling and atmospheric pressure of the wood, the wooden mold was tightly sucked, the D4mm steel bar was pulled off, and only a part was pulled out, and a small part remained in the hole and could not be removed. In addition, the best timing for demoulding the method is also difficult to grasp. For example, if the demoulding is too early, the surrounding concrete is easily cracked, and the demoulding is too late to be removed. Therefore, this scheme is not used in the actual construction of the anchor bolts of the base of the polymerizer.
The galvanized iron wrapping scheme for precast wooden piles is made of solid wood and processed into wooden piles with a size of 150mm@150mm@1000mm. Considering that the iron sheets are smooth and easy to demould, the galvanized iron sheets with a thickness of D=0.5mm are tightly wrapped around the wood. The outside of the pile is fixed with iron nails, thus forming a precast wooden pile core wrapped with galvanized iron. When the mold is supported, the stake is fixed at a predetermined position, the upper end is exposed to 300 mm, and the reactor is electrically heated by using a No. 8 iron wire. After the concrete is finally set, the tripod is temporarily set up using a 2t inverted chain to pull out the stake. Although this method is better than the former method, it is also limited by the concrete setting time. Due to the large number of wooden piles that need to be pulled out, the concrete of the latter batch of piles has solidified after the previous piles are pulled out. Hard to pull out. Therefore, the actual construction of the hole in the anchor bolt of the polymerizer base has not been adopted.
In view of the difficulty in demoulding of the prefabricated reinforced concrete sheet and the poor quality of the hole forming, it is envisaged that the template of the same material as the base of the polymerizer is not removed, that is, the concrete sheet is used instead of the wood mold. Since the concrete slab is heavy and cannot be nailed and formed, a single piece prefabrication method for assembling the mold on site is adopted. The prefabricated reinforced concrete cylinder mold is in the shape of a small and large ribbed structure. After the concrete is poured, it is not removed, but is formed integrally with the foundation to enhance the anchoring property of the cylinder mold itself and the foundation, and further enhance the anchoring of the anchor bolt. performance.
Prefabrication of reinforced concrete sheets Firstly, a layer of water-washed masonry sand is laid on the ground, and the fine-grained concrete of the same strength grade as the base of the polymerizer is laid and scraped and properly reinforced (the ends of the steel bars are beyond the thin plates) A certain length,), finally with a wooden trowel bristles, covered with plastic film to maintain the design strength grade, forming a single trapezoidal thin plate with a top length of 150mm, a lower side of 200mm, a height of 800mm, and a thickness of 25mm. The height of the sheet is 100 mm deep and the hole is designed to facilitate the sealing of the concrete into the hole when the foundation concrete is poured.
At the scene, 4 prefabricated veneers were assembled and assembled on site to form a prismatic cylinder mold with an upper section of 150 mm@150 mm, a lower section of 200 mm@200 mm and a height of about 800 mm. After attaching one D10mm steel bar to each of the four corners of the drum mold, the exposed steel bars on all the single boards are screwed together in pairs, and the 18th iron is pulled diagonally in the upper and lower bottoms. The line is used to adjust and stabilize the cross-sectional shape. Finally, the cement mortar prepared by V (cement) BV (sand) = 1B1 is used to smooth the corners (water spray curing 7d) to form a four-sided closed prism mold to block the fight. The seam is prevented from affecting the depth of the hole when the cement slurry flows into the hole when the foundation concrete is poured.
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