Expired Tender for the Preparation of Design for the Road Improvement Project of the Royal Historical Villa Arcadia in Spain

Project Title: Preparation of Engineering Design for Road Improvement Projects in the Municipality of Los Realejos, including Pavement Resurfacing, Sidewalk Renovation, and Urban Pipeline Network Replacement/Installation

Project Description: Provision of comprehensive engineering design document preparation services for the repair, resurfacing, sidewalk construction, and replacement/installation of underground pipeline networks (e.g., water supply, drainage) on multiple specific roads within the municipal jurisdiction.

Type of Tender Procedure: Simplified open procedure, ordinary process, divided into two lots.

Overall Project Design Scope and Requirements:

Deliverables: Must provide a complete set of construction-ready engineering design documents compliant with Spanish Technical Building Code and local municipal regulations.

This includes but is not limited to: Technical Report, Surveying and Topographic Maps, Bill of Quantities, Complete Construction Drawings, Detailed Budget, Construction Safety and Health Study, Brief Environmental Impact Assessment, Construction Organization Plan.

Design Standards: All designs must comply with Spanish road standards (e.g., regulations for urban roads in Orden FOM/2523/2014), accessibility standards, and Canary Islands regional building codes.

Pavement Resurfacing Engineering Design Requirements

Current Condition Survey and Assessment Report:

Geometric Data: Provide road cross-sections (interval ≤20m), longitudinal profile, and horizontal alignment data based on high-precision laser scanning or total station measurements, with accuracy meeting construction layout requirements.

Structural Condition: Conduct Falling Weight Deflectometer tests, one measurement point per lane every 20 meters, plot deflection basins, calculate representative deflection values, and assess subgrade and structural layer moduli according to PG-3 specifications. Provide Ground Penetrating Radar report identifying hidden voids, poor interlayer bonding, and other defects.

Material Sampling and Analysis: Core samples from existing asphalt surface and base layers for laboratory analysis of bitumen content, gradation, Marshall stability, flow value, and splitting tensile strength. Conduct particle size analysis, moisture content, and CBR value determination for subgrade soil.

Traffic Analysis: Provide 72-hour traffic volume and axle load spectrum survey data based on automatic counters, used for calculating cumulative equivalent standard axle loads.

Structural Design and Material Specifications:

Mechanical Calculations: Use professional software (e.g., ALIZE, KENLAYER) for multi-layer elastic system theory calculations based on AASHTO 93 or Spanish standards. Specify design life (typically 10-15 years), reliability index, and allowable deflection value.

Layer Design: Specify in detail:

Surface Layer: Use S-20 or S-12 type dense-graded asphalt concrete (HL-8 or HL-12). Specify modified asphalt grade (e.g., PMB 45/80-65), add cellulose or polymer fibers to improve crack resistance. Specify construction temperature control ranges (plant discharge, arrival, paving, final compaction).

Bonding Layer: Use emulsified asphalt CRS-2 or modified emulsified asphalt, with application rate specified precisely in grams per square meter.

Base/Subbase Layer: If using cement-stabilized aggregate, specify cement content (3-5%), 7-day unconfined compressive strength (≥3.5 MPa), gradation curve envelope, and curing requirements.

Drainage and Curbing: Design road crown cross-slope of 2-2.5%. Precast concrete curbs require compressive strength ≥30 MPa, and include installation details (foundation, mortar, joint treatment).

Sidewalk Renovation Engineering Design Requirements

Detailed Design:

Accessibility System: Tactile warning strips must comply with UNE 170001-2 standard, with raised dot height of 5mm and center spacing of 17mm. Ramp gradient strictly controlled within 8.33% (1:12), with minimum landing dimensions of 1.5m x 1.5m. All designs must be validated by simulating a "wheelchair turning circle" (diameter 1.5 meters).

Paving Structure: Typical structure: 6cm thick granite or high-strength concrete slabs (slip resistance value BPN≥65) + 3cm thick cement mortar leveling layer + 15cm thick C20 plain concrete base + 10cm thick graded gravel bedding. Provide paving layout plan, joint details (width, sealant), and edge treatment details with curbs and building entrances.

Load Considerations: Sidewalk structure must withstand occasional loads from light service vehicles (e.g., garbage trucks, axle load 3 tons).

Urban Pipeline Network Replacement and Installation Engineering Design Requirements

Underground Detection and Information Management:

Comprehensive Detection: Use a combination of Ground Penetrating Radar, utility locators, and limited excavation verification to create a "Comprehensive Underground Utility Database" containing coordinates, elevations, pipe diameter, material, ownership, and current condition (corrosion, deformation). Format must be compatible with municipal GIS systems.

BIM Application: Strongly recommended to establish a project-level BIM model (LOD 350 or higher) for pipe clash detection, burial depth analysis, precise excavation volume calculation, and construction sequence simulation.

Pipeline Hydraulic and Structural Design:

Water Supply Pipes: Use EPANET software for steady-state and transient hydraulic analysis to ensure minimum free head at the most unfavorable point ≥15m. Pipe material preferably K9 grade ductile iron pipes, with bell and spigot joints and T-type rubber gasket seals. Install isolation valves every 500 meters, automatic air release valves at high points, and drain valves at low points. Provide pipe laying profile drawings indicating pipe invert elevation, cover depth, trench slope, and support details.

Sewer Pipes: Use Manning's formula for hydraulic calculation, design flow depth ratio ≤0.7 (DN≤500) or 0.75 (DN>500). Pipe material: HDPE solid-wall pipes or PVC-U pipes with SN8 ring stiffness, using rubber gasket bell and spigot joints. Manhole spacing: not exceeding 40 meters for pipe diameter ≤400mm. Design details for channel, steps, and safety net installation.

Pipe Bedding and Backfilling: Design granular bedding (thickness 150-300mm) or concrete supports based on soil conditions. Specify backfill material as graded gravel with maximum particle size of 25mm, compacted in layers (each ≤200mm) using plate compactors or impact rammers to achieve compaction ≥95% of standard Proctor density.

Construction Organization and Project Management Design

Phased Traffic Management Plan:

Provide detailed traffic diversion plans for phased construction, including layout of temporary traffic signs (compliant with RD 1428/2003), variable message signs, and night warning lights. Coordinate with local traffic police to develop the plan, ensuring temporary adjustments to bus routes and emergency vehicle access.

Quality Assurance and Inspection Plan:

Design documents must include a "Project Quality Inspection Plan", specifying inspection frequency, methods, sampling standards, and acceptance criteria (according to UNE-EN or Spanish NLT standards) for each work item (e.g., subgrade compaction, asphalt mix temperature, pipe watertightness test).

Health, Safety and Environmental Management:

Prepare a complete "Construction Safety and Health Study Plan", identifying risks such as excavation collapse, mechanical injury, dust, and noise, and developing control measures. Specify classification, recycling, or disposal plans for construction waste (e.g., old asphalt, excavated soil), aiming for a recycling rate of over 75%.

Contract Nature: Service Contract (Design Services)

Main Classification Code: 71242000 (Project and Design, Budget Preparation)

Total Estimated Contract Value (excl. VAT): €30,737.54

Total Tender Budget (incl. VAT): €32,889.16

Contract Performance Period: 4 months (or 16 weeks)

Performance Location: Los Realejos Municipality, Canary Islands, Spain.

Applicability of Government Procurement Agreement: No

Lot Division and Scope:

Lot 1: Design for road resurfacing, asphalt paving, and facility improvement projects involving "La Cuadra Road", "Tierra de Oro Street and San Cayetano Street", "El Sol Street", "Route 040 El Lance", "El Natero and Hoya del Cardo Area", and the sidewalk in front of "San Isidro Street and the Health Center".

Lot Estimated Value (excl. VAT): €15,325.62.

Road Condition Survey: Requires systematic testing of existing pavement thickness, evenness, bearing capacity, and defect distribution, providing a professional report including pavement deflection measurement point maps and damage rate statistics.

Structural Layer Design:

Specify milling thickness and scope of old pavement, provide a plan for recycling milled material.

Design new asphalt concrete surface structure, including base layer (HL-12), intermediate layer (HL-16), and wearing course (HL-8).

Provide detailed material technical specifications: asphalt grade, aggregate gradation, Marshall stability, flow value, etc.

Ancillary Facility Renovation:

Drainage system renovation design, including ditch cross-section, catch basin locations, pipe slope calculations.

Repair or new construction plans for curbs and shoulders.

Update design for traffic safety facilities (signs, markings, guardrails).

Construction Traffic Management: Prepare phased traffic diversion plans during construction to ensure resident travel safety.

Subgrade Treatment Design: Propose soft soil treatment solutions (e.g., replacement, reinforcement) based on geotechnical investigation report.

Pavement Structure Design: Provide complete structural layer thickness calculations, considering traffic load class (T-0/T-1).

Intersection Design: Optimize intersection geometric design to improve capacity and safety.

Integrated Drainage Design: Ensure effective connection between road drainage and existing stormwater network.

Integrated Sidewalk Design: Comprehensively plan sidewalk paving, green belts, and street furniture layout.

Accessibility Design: Strictly design tactile paving and ramps according to Spanish accessibility regulations (RD 505/2007).

Street Lighting Renovation: Design lighting facility layout and selection based on road alignment.

Alignment Optimization Design: Conduct safety assessment and optimization for curves and gradients.

Slope Protection Design: Perform stability analysis for roadside slopes and propose protection measures.

Sight Distance Assurance Design: Remove obstacles affecting sight distance and install necessary warning signs.

Integrated Utility Network Design: Comprehensively design the location and depth of water supply, drainage, power, and communication pipelines.

Construction Coordination Design: Develop the sequence and coordination plan for cross-disciplinary construction activities.

Temporary Facility Design: Including construction access roads, temporary drainage, material storage areas, etc.

Special Design Around Medical Facilities: Consider emergency vehicle access needs, optimize road cross-section.

Pedestrian Priority Design: Install speed bumps, crosswalks, and waiting areas near the health center.

Greening and Landscape Design: Select low-maintenance plants suitable for the local climate.

Lot 2: Design for waterproofing, resurfacing, and facility improvement projects involving "El Brezal Phase 3", "El Mocán Street", "Camino Los Tres Pinos Phase 2", "El Madroño Road", and the pedestrian walkways in "Honduras and Panama".

Lot Estimated Value (excl. VAT): €15,411.92.

Phased Implementation Design: Specify the connection plan between the third phase and previous phases of the project.

Community Traffic Impact Assessment: Predict the impact of construction on surrounding residents' travel and propose mitigation measures.

Ecological Protection Measures: Design dust control and noise protection measures during construction.

Safety Design Around Schools:

Traffic control plan during school arrival and departure times.

Student crossing safety facilities (traffic signals, crosswalks, refuge islands).

Design of parent waiting areas and non-motorized vehicle parking areas.

Coordination with Educational Facilities: Coordinate construction schedule with school administration to minimize disruption to teaching.

Quality Control Design:

Develop material arrival inspection procedures.

Determine quality control points and inspection frequency during construction.

Prepare final acceptance standards and methods.

Maintenance Design: Propose routine maintenance plans after the road is put into service.

Special Design for Rural Roads: Consider agricultural machinery access needs, design appropriate road width and load standards.

Ecological Drainage Design: Adopt infiltration and drainage combined methods to reduce surface runoff.

Use of Local Materials: Prioritize the use of locally available construction materials.

Waterproofing System Design:

Select suitable waterproofing materials (membranes, coatings, etc.).

Design detailed construction joint treatment plans.

Provide waterproofing system performance testing methods and standards.

Pedestrian Environment Enhancement:

Paving Material Selection: Consider slip resistance, durability, aesthetics.

Rest Facility Layout: Reasonably locate benches, shelters, etc.

Landscape Lighting Design: Create a safe and comfortable nighttime walking environment.

Tender Rules: Tenderers may bid for one or more lots.

Bid Guarantee: A final performance bond is required, amounting to 5% of the contract value.

Tender Submission and Opening:

Submission Method: Must be submitted electronically via the Spanish National Tender Platform.

Tender Documents: Single envelope system, containing administrative documents and automatically quantifiable criteria.

Economic Bid Opening: Scheduled to be held publicly at the Town Hall on February 17, 2026, at 12:26 (date and time are estimated).

Contract Management:

Electronic Invoicing: Accepted

Electronic Payment: Used

Electronic Order: Not used

Funding Source: No EU funding.

Electronic Auction: Not used.