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Physical property requirements of 50mm spring semicircle drainage pipe in tunnel: the spring semicircle drainage pipe is a new drainage material for tunnel. It is a half pipe shape formed by heat sealing of steel wire with PVC coated plastic and PVC soft skin or a composite geomembrane with one cloth and one film, and gluing at the unheated part. Its size depends on the requirements of the specific engineering design document. The material of φ 100 spring semicircle drain pipe shall meet the following requirements: lOOmm in the span; The section height is 45mm; The diameter of plastic coated (PVC) steel wire is 3.0mm; Film thickness 0.30mm, non-woven fabric 1209; The reserved edge width of film on both sides is 25mm. Half

2024/09/21 13:56:25

Performance of hot-melt gasket for three-dimensional EVA waterproof coiled material drainage board: (1) When the underground water is corrosive to the concrete structure, corresponding measures should be taken to ensure the safety and durability of the structure. (2) Waterproof works 1. The impermeability grade of tunnel secondary lining shall not be lower than P8. Waterproof board and non-woven fabric shall be laid on the arch wall between the initial support of the lining in the concealed excavation section and the secondary lining; Waterproof board and non-woven fabric are set at the outer edge of the lining of open cut tunnel section. (3) The circular construction joints of tunnel lining arch wall shall be waterproof treated with medium buried rubber waterstop and externally pasted plastic waterstop, and the circular construction joints of inverted arch shall not be waterproof treated. (4) The deformation joint of tunnel lining is medium

2024/09/17 14:26:45

Construction method of soft 50mm semicircular drainage pipe: A. For tunnels with small clear distance and tunnels with parallel sections of road and tunnel at the entrance, construction shall be carried out in strict accordance with the construction procedures, and the protection of rock columns in the middle shall be strengthened to ensure construction and structural safety. B. Before tunnel construction, axis control, leveling and other resurveys shall be carried out, and the measurement accuracy shall meet the requirements of technical specifications. C. Tunnel construction shall be carried out in strict accordance with Technical Code for Construction of Highway Tunnels (JTG/T3660-2020) and relevant regulations. D. Precautions for the construction of water rich section of tunnel ① There may be large water inflow during the excavation of the tunnel passing through the fault zone, and the construction should be

2024/09/16 15:41:56

Requirements for cleaning the waterproof geomembrane site of the landfill site: (1) The anti-seepage membrane laying area of the landfill site shall be cleaned, compacted and leveled, especially weeds, sundries, surface soft soil, trees, bamboo, etc., the deep roots of plants shall be removed manually or mechanically, and the hard objects cleared shall not be buried at the bottom of the reservoir; (2) Clay shall be used as the filling soil for the impervious membrane base course, and shall be compacted layer by layer, with the compactness not less than 94%. The particle size, uniformity and chemical compatibility of backfill shall meet the specification requirements; (3) Before laying the anti-seepage membrane in the rock area with large edges and corners, the rock shall be treated, leveled and cleaned first, and then the anti-seepage membrane in the rock area with large edges and corners shall be paved with M

2024/09/12 10:26:24

The emergency plan for the construction of semi-circular flexible permeable pipes is formulated to meet the emergency rescue needs in case of unforeseen emergencies during construction, avoid casualties of construction personnel, and reduce various losses. The main measures are as follows: (1) When the main tunnel is constructed to the cross passage position, the cross passage shall be cut through in time for emergency rescue; (2) The ventilation pipe close to the working face shall be used as the life saving pipe. The air pipe in this section shall be steel pipe, and the length shall not be less than 100m; (3) Wireless telephone is set in the tunnel, and UPS is used for construction lighting; (4) Temporary steel frame, timber, drilling rig and other facilities shall be prepared outside the tunnel. Spring semicircle 10

2024/09/11 15:14:42

Precautions in the construction of PVC waterproof coiled material drainage board hot-melt gasket: A Before excavation of open cut trench, drainage work shall be done in advance in combination with subgrade conditions, and the circular intercepting ditch at the portal shall be completed in advance. B. When one side of the foundation of the open cut tunnel structure is on the bedrock and the other side is on the soil layer, in order to prevent uneven settlement, the open cut tunnel foundation and the subgrade bed in the soil layer section shall be excavated to the bedrock surface, and the bedrock surface shall be excavated into a step shape, and then filled with mortar rubble before the open cut tunnel structure and subgrade base can be made. C. During the excavation of side and front slopes, the protection must be synchronized with the excavation. When the excavation is near the tunnel surface, the core soil or steps should be reserved for advance support

2024/09/09 17:00:32

Model of polyethylene closed cell foam board: polyethylene closed cell foam board can be divided into L-1100 type (also called L-1400 type) and L-600 type according to foaming ratio; It can be divided into medium pressure polyethylene closed cell foam board (L-1100 type) and high-pressure polyethylene foam plastic board (L-600) according to the pressure bearing size; Among them, L-1100 type (also called L-1400 type) is suitable for making cement joint filler plates for ordinary water channels and pools; L-600 type is hard and suitable for filling cement joints of reservoir dams. What is the polyethylene closed cell foam board used for

2024/09/08 15:16:20

Selection of steel edge putty 651 waterstop: the selection of waterstop shall be based on the importance level of the building, deformation amount and water pressure of the deformation joint, the use environment and price of the waterstop. ① Consider the impact of contact medium, such as acid, alkali, oil and other types of corrosion; ② Mould resistance, the mould resistance of waterstop shall be considered to be above Grade II; ③ Service conditions, such as temperature and other influencing factors. Cross section size. When the structural cross section size is greater than 500 mm, the width of the waterstop is not less than 300 mm. Product applicability of rubber waterstop. The waterstop series products produced by our company are widely used in various types of concrete

2024/09/05 15:11:43

PVC semicircle anti crystallization double wall perforated 80mm corrugated pipe Purpose: tunnel drainage. Urban sewage discharge. Artificial lake drainage. Metro tunnel drainage. Mine drainage. Technical indicators of blind ditch soft anti crystallization 100mm double wall corrugated pipe: a. The inner wall of the pipe is smooth, the color is uniform, and the pipe wall is free of bubbles, cracks, decomposition discoloration lines and obvious hungry magazines; b. Vertically pressurize to 40% of the outer diameter, unload immediately, and the sample will not break or delaminate; c. When the temperature is 0 ℃ and the height is 1M, impact 10 times with a 1Kg weight hammer, and there should be no cracking after more than 9 times; d. The permeable holes are evenly drilled at the height of the wave trough

2024/08/28 17:04:38

Color: white Executive standard: national standard Tensile strength: 4kg/cm2 Notch impact strength: 5kg.cm Elongation at break: 5% Water absorption: 2% Bonding force: 2.1 kN Flame retardant performance: secondary seepage coefficient: primary tensile force: 3 MPa Pressure resistance: 1.7 kN Metro tunnel EVA impervious geomembrane Hot melt gasket Features: A, due to the use of plastic fiber, It can maintain sufficient force and elongation under dry and wet conditions. B、 Corrosion resistance. It can resist corrosion for a long time in soil and water with different pH values. C、 Good water permeability: there are gaps between fibers, so it has good water permeability. D、 Good antimicrobial properties

2024/08/25 17:08:09