A request for quotation (RFQ) to execute a trenchless crossing -either microtunnel, Direct Pipe, HDD or a submarine emissary from the ground - must provide sufficient technical, geometric and contractual information to enable Eurohinca to assess the feasibility, optimal construction method and risks of the project. The more complete the RFQ is, the more accurate the bid will be and the less uncertainty there will be during the construction phase.
The following is the essential information that must be included:
1. Geometry of the layout
It is essential to contribute:
Plan and longitudinal profile, with start/end dimensions.
Total length of the crossing and minimum coverages.
Minimum radii of curvature and admissible slopes.
Distance available for the attack and reception wells.
For complex or curved sections, it helps to consult references of works such as the microtunnel in El Arenao curve.
Geotechnical information
The RFQ should include:
SPT/CPT, granulometry, Atterberg, permeability and RQD soundings in rock.
Water table and seasonal variations.
Predicted terrain transitions (clays → sands → gravels → gravels → rock).
Risks detected: collapsibility, expansiveness, bouldering, internal erosion, etc.
For crossings under the coast or outfalls, marine characterization is also relevant, as explained in submerged applications.
3. Pipe or conduction data
Eurohinca needs to know:
Inside/outside diameter and thickness.
Material (HDPE, HRPV, reinforced concrete, steel, ductile iron).
Type of joint, pipe length and tolerances.
Internal design pressure and service conditions.
In urban hydraulic projects, these criteria are related to the functionality of the system, as summarized as follows trenchless urban sewer systems.
4. Environmental conditions and easements
The RFQ must specify:
Existing infrastructure: roads, railways, collectors, cables.
Permitted conditions and restrictions (schedules, occupation of public roads, noise).
Access available for machinery, piping, sludge and logistics.
In industrial zones and plants, many of these restrictions are illustrated by trenchless infrastructure crossings.
5. Particular customer requirements
Utility's internal regulations or EPC.
Required tests: CCTV, pressure tests, hydraulic tests.
Required service life, sealing standards and environmental requirements.
Time constraints, contractual milestones and operating windows.
For emitters, additional aids can be found at what is a submarine outfall.
6. Planning information and risks
Space available for sludge plant, stockpiles and equipment.
Transport limitations (narrow access, curves, special loads).
Necessary permits (coast, roads, railroads, public domain).
In coastal or marine projects, these variables are integrated as in sea water catchments.
7. Desired documentation (if available)
Preliminary IFC or preliminary draft.
BIM models of the layout and wells.
Environmental impact studies or bathymetries (for outfalls).
Photographs of the environment and operating restrictions.
Conclusion
A complete RFQ allows Eurohinca to define:
The optimal construction method (microtunnel, Direct Pipe, HDD).
The geotechnical and operational risks.
The civil works requirements and the necessary wells.
The realistic deadlines and the estimated cost of the project.
An incomplete application generates uncertainty and requires conservative assumptions, so it is always advisable to provide as much detail as possible.
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