The Concrete Box Culvert Formwork is a specialized molding system for reinforced concrete culverts, compatible with precast and cast-in-situ methods. Its modular high-strength design ensures dimensional accuracy, structural integrity, and construction efficiency.

Ideal for drainage systems, transportation culverts, hydraulic projects, and utility tunnels, it meets large-span and high-load requirements while balancing prefab efficiency and cast-in-situ adaptability.

Purpose

Produces standard concrete culverts (single / multi-cell).
Suitable for ≤15m overburden depth and seismic zones ≥8°.

Applications

Field	Project Examples
Municipal	Stormwater / sewer mains, utility tunnels, sponge cities
Transport	Highway culverts, railway box culverts, metro passages
Hydraulic	River interceptors, irrigation channels, flood control
Energy	Nuclear plant cooling pipes, oil/gas protection casings

Specifications Table

Parameter	Specification Range	Description
Structure Type	Precast: 2m×2m–6m×4m Cast-in-situ: 2m×2m–8m×6m	Custom large sizes & multi-cell configurations available
Segment Length	Precast: 2m–6m Cast-in-situ: 3m–12m	Standard sizes: Precast: 3m, 4m Cast-in-situ: 6m, 9m
Wall Thickness	Precast: 150mm–400mm Cast-in-situ: 200mm–600mm	Customized per overburden depth & load rating
Joint Type	Grooved (dual gasket) Bell & Spigot	For rubber gasket sealing or expansive cement filling

Materials Table

Component	Material	Characteristics
Precast Mold	Q345B low-alloy steel plate	High strength (yield strength ≥345MPa), hot-dip galvanized (coating ≥120μm)
Cast-in-situ Formwork	High-strength aluminum alloy	Lightweight (density 2.7g/cm³), excellent corrosion resistance
Support System	Q345B hot-dip galvanized steel pipe	Yield strength ≥345MPa, zinc coating ≥85μm, rust-proof
Seals	EPDM rubber / Water-swelling strip	Aging-resistant, suitable for -50℃~120℃, IP67 sealing grade

Technical Parameters Table

Parameter	Technical Index	Remarks
Production Efficiency	Precast: 8-12 segments/day Cast-in-situ: 30-60 mins/segment	Adjustable per process & mold size
Demolding Cycles	Precast: ≥800 cycles Cast-in-situ: ≥300 cycles	Lifespan: Precast mold: 10-12 years Cast-in-situ formwork: 5-8 years
Compressive Strength	≥35MPa (Pipe body)	Concrete grade: C40-C50 Flexural strength: ≥6.5MPa
Watertightness Grade	P12-P15	Joint watertightness test pressure ≥1.5MPa
Dimensional Tolerance	Precast: Length ±2mm, Height ±3mm Cast-in-situ: Length ±3mm, Height ±5mm	Calibration: Precast: 3D CMM Cast-in-situ: Laser positioning

Product Features

Prefabricated square culvert mold

• Modular design: Compatible with single / double / multi-cell structures, with embedded part positioning for functional openings.

• High-efficiency production: Horizontal vibration molding (≤60 min/section), 12 sections/day output; 50% faster hydraulic demolding.

• Smart QC: Integrated vibration / pressure sensors + electric curing with auto temperature control.

Cast-in-place square culvert mold

• Rapid assembly: Aluminum formwork (≤1 hr/section), adaptable to variable sections / access ports.

• Precision molding: Ra≤1.6μm surface finish, 3D positioning (≤3mm axis deviation).

• Eco-safety: Steel support anti-overturning factor ≥2.0; aluminum formwork (300+ reuse cycles).

Target Clients

Prefabricated square culvert mold	Utility tunnel contractors	Cast-in-place square culvert mold	Transportation construction firms
Precast concrete manufacturers	Underground utility operators	Municipal contractors	Geotechnical project teams