WENDY by Stern Technic

The bore record for trenchless pipeline construction.

Plan, utility records, terrain elevations, machine data and photos in one record per bore – every value with its source.

WENDY by Stern Technic is the platform for trenchless pipeline construction: plan routes on the desktop and check them against DVGW GW 302 and GW 125, document the site in the site diary, collect approvals by link without an account, and run every project as a bore record – every value with its source, export to GAEB X83, IFC4 and LandXML.

Your route, worked through

One route. Five stations. One bore record.

CO₂, cost, approval, BOB run: every station works with your route from the planner – and ends in the drill report.

1. Station 1 of 5

   What your route saves in CO₂.

   Trenchless versus open trench – calculated with factors from Ökobaudat, KBOB and TEPPFA.

   Route planning and CO₂ balance for your route: WENDY places launch, exit and intermediate pits by method and shot length and plans crew and equipment travel from the depot to the site. Distance, vehicles and consumption give the diesel per working day. The CO₂ balance compares trenchless installation (HDD, mini-HDD, microtunnelling, pipe bursting, BOB, BUDDEL) with open trench: pipe production, excavator or drill rig, soil and material haulage, asphalt reinstatement and travel. For a 269 m urban HDD route, trenchless installation saves around 8 t CO₂e, about two thirds. Emission factors come from Ökobaudat, KBOB and TEPPFA EPDs; every assumption is adjustable.

2. Station 2 of 5

   Estimate with your own rates.

   Change a rate – net total, cost per metre and construction time update instantly. One calculation, one figure.

   The WENDY cost calculator estimates your route from direct costs: daily output, crew, day rates for equipment and support equipment, pipe per metre, launch, reception and intermediate pits, site setup, transport, traffic management, survey and documentation, drilling fluid and disposal, risk allowance, and overheads and profit. Length, method and soil come from the planner; you replace every rate with your own. Net total, cost per metre and construction time in working days appear instantly – one calculation, one figure, the same as in the drill report. The comparison shows what the same route would cost and how long it would take as an open trench.

3. Station 3 of 5

   Checked to standard, approved by you.

   Bend radius, clearance, cover and utility records – every finding blocks approval.

   Approve your plan yourself: WENDY checks your route automatically – minimum bend radius per DVGW GW 302, minimum cover, utility records and clearance to third-party lines per DVGW GW 125 – including the line's position tolerance: if the clearance only holds when the line lies exactly where the plan shows it, it counts as not reliable. This page only has an example line, so utility records and clearance are never green. A finding blocks approval until it is fixed or deliberately accepted with a written reason. You tick off the on-site checks, add a note and approve with name, role and timestamp – or reject with a reason. The approval record carries a checksum of the plan: if the route changes afterwards, the approval visibly becomes invalid.

4. Station 4 of 5

   BOB steers around obstacles on its own.

   Contact at the cutting head (the drill head), back-up, new start in an arc – place a stone and watch.

   In the simulation BOB first runs into the stone — it has no look-ahead sensors. When vibration at the cutting head and motor load rise above the threshold, it detects the obstacle and stops advancing. Only at standstill does it reverse and back up along its own track far enough for an evasion arc to fit. It then re-sets in an arc with a lateral offset — every arc keeps the pipe's minimum bend radius to DVGW GW 302, 1.25 m for the PE-HD DN 50 cable duct. If that fails, it tries a larger offset or the other side until it is past and steers back onto the planned route. The first run uses the soil from your input; before approval every run is a trial run, not a bore. Every step is recorded with its station and sensor readings in the event log and flows into the bore record and the drill report.

5. Station 5 of 5

   The record becomes the drill report.

   Photos, approval and BOB run at their station – as PDF or CSV, based on DVGW GW 321.

   In the bore record, WENDY files everything at its station along the route: site photos with capture time and GPS from the EXIF data, the approval note with name and timestamp, and the events of the BOB run – contact, retraction, restart, passage, target pit. Vibration at the drill head and motor load are plotted against the chainage. Anything still missing is shown as missing, never filled with a default. The result is the drill report, based on DVGW GW 321: general data, approval, every entry with timestamp and GPS position on the route axis, readings, cost and CO₂ balance. It can be downloaded as CSV or printed as PDF.

Data room

What is missing is shown as missing.

Plan, utility records, machine, sensors, photos, survey and decisions in one record – every source with provider, date and provenance.

Every value carries its provenance. The machine is one source, not a prerequisite.

Request a quote

Added in the product

Plan at the desk. Document on site. Approve by link.

Capabilities

What WENDY does today.

Every statement here is built into the product. Anything not yet shipped is marked “to follow”.

Licence

One licence: WENDY ONE.

All modules, price and term by quote, net B2B – activated by Stern Technic, no auto-renewal. Included automatically with the purchase of a WENDY machine (BOB or BUDDEL).

BUDDEL and BOB as Robot as a Service, billed per drilled metre. Request a robot

Licence in detail

Questions

Frequently asked questions

Five questions before you buy, answered briefly.

All questions and answers