First, the shaft wall structure
The vertical shaft wall structure forms include a masonry wall, an integrally cast shaft wall, an anchoring well wall, a fabricated shaft wall and a composite shaft wall.
Second, the wall construction requirements
(1) Construction of shaft wall supported by bolting and shotcreting
When the wellbore is supported by anchor spray, it shall comply with the following requirements:
1. The strength, thickness and anchoring force of shotcrete and shotcrete should meet the design requirements.
2. The inner radius of the wellbore should meet the design and allowable deviation requirements.
3. The spacing, depth, quantity and specifications of the anchors should meet the design requirements.
4. Appearance quality requirements of anchor spray support: no separation layer, no peeling, no cracks, no exposed bars, and the end of the anchor rod is not exposed.
(2) Construction requirements for masonry wall
When the wellbore is supported by blocks and concrete, the construction of the well wall should meet the following requirements:
1. The thickness of the well wall should meet the design requirements. The deviation of the local thickness should not be less than the design thickness of 50mm (the deviation of the perimeter of the wellbore should not exceed 1/10 of the design, and the longitudinal height should not exceed 1.5m).
2. The surface roughness per square meter of the wall of the well wall shall be no more than 25mm for the stone masonry, 15mm for the concrete block, 10mm for the concrete to be poured, and no more than 30mm for the joint.
3. There shall be no exposed ribs, cracks and honeycombs on the surface of the well wall.
4, the specifications of the masonry should be consistent with: the horizontal deviation of each layer of masonry, the concrete block should not be greater than 20mm, the stone should not be greater than 50mm; the masonry vertical without joint seam, the length of the compression should not be less than the length of the masonry 1/4; the gray joint should be full, the thickness of the concrete block and fine material lime joint should be equal to or less than 15mm, and the coarse stone should not be larger than 20mm.
(III) Construction requirements for cast-in concrete wall
When the wellbore is supported by cast-in-place concrete, the formwork and reinforced concrete support materials shall meet the following requirements:
1. The height of the wooden formwork should not exceed 1.2m. The thickness of each wooden board should not be less than 50mm, and the width should not be more than 150mm; the side of the concretework should be planed.
2. The height of the assembled steel formwork should not exceed 1.2m, and the thickness of the steel plate should not be less than 3.5mm; the position of the bolt holes should be ensured that any two pieces of the template can be connected to each other up and down and left and right; the formwork should have sufficient rigidity.
3. The height of the overall movable steel formwork should be 2-5m. The thickness of the steel plate should meet the rigidity requirements. When the formwork is suspended on the ground or under the hanging plate, the hanging point should be no less than three.
4, the overall sliding template height should be 1.2-1.4m, the thickness of the steel plate should not be less than 3.5mm; the taper should be 0.6%-1.0%; should have sufficient stiffness.
5. After the assembled template, the outer edge radius should be larger than the net radius of the wellbore design by 10-40mm, and the upper and lower sides should be horizontal, and the allowable error is ±10mm; the reused template should be repaired and shaped.
6. The water-cement ratio and slump of concrete shall be strictly controlled according to the construction design, and the additives shall comply with the construction design regulations.
7. Reinforced concrete shaft wall, steel bars should be tied or welded into the ground, and the vertical reinforcement of the well is tied. At the bottom of each section, the joint position is allowed to be on the same plane.
8. The pouring of concrete should be carried out in layers and symmetry, and mechanical vibration must be used. When using a sliding form, the thickness of the layered casting should be 0.3-0.4m, and the interval between sliding and lifting should not exceed 1h.
9. The concrete strength during demolding shall be 0.05-0.25 MPa when adopting the sliding formwork; 0.7-1.0 MPa when using short-section excavation; and not less than 1.0 MPa when adopting other formwork.
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