How to Verify 8-Ton Spider Crane Access for a Narrow Workshop
A 1.6 m-wide crane should not be assumed to fit safely through an access route that is also 1.6 m wide.
The published overall width of the Onchtech 8-ton spider crane is 1.6 m, with an approximate self-weight of 8.7 tonnes. These figures are useful for initial planning, but they are not sufficient to confirm workshop access. The effective doorway opening, actual transport envelope, turning path, overhead clearance, floor condition, outrigger area and lifting requirements must all be verified on site.
Why Nominal Width Alone Does Not Confirm Access
The stated 1.6 m overall width describes the crane itself under a defined configuration. It does not represent a recommended doorway width or guaranteed passage clearance. A doorway marked as 1.6 m may have a smaller usable opening because of frames, hinges, door hardware, columns, guards, thresholds or measurement tolerances.
The crane must also remain aligned while moving. Even if a straight section appears wide enough, steering corrections, uneven flooring and turns can cause parts of the machine to move outside the static width envelope. For this reason, access feasibility should be based on the narrowest effective point along the complete route, not the nominal width of the main doorway.
Planning principle: If the measured opening is close to the machine’s published width, treat the route as unconfirmed until the actual machine configuration and site dimensions have been checked with an appropriate clearance allowance.
Seven Checks Required Before Entry
1. Confirm the Transport Envelope
Verify the crane’s actual width, height and length in the configuration used for travel. Check the position of the boom, hook, outriggers, controls and any fitted options. Removable or adjustable components should only be handled according to the applicable operating instructions.
2. Measure Effective Openings
Measure doorway width at the top, middle and bottom, and record the smallest result. Measure clear height as well. Include shutters, frames, ramps, thresholds, cable trays, pipes and temporary barriers that reduce the usable opening.
3. Check the Swept Path
A crane requires more space while turning than when travelling straight. Survey corners, aisle intersections and approach angles. Where clearance is limited, a scaled route drawing or controlled trial assessment can help identify track, counterweight or boom-end interference.
4. Inspect Overhead Obstructions
Check door headers, beams, lighting, sprinkler pipes, ventilation ducts, crane rails and suspended services. Overhead clearance must be assessed throughout the route and at the lifting location, not only at the entrance.
5. Verify Floor Capacity
The workshop floor must support the travelling machine and the loads created during lifting. Review slab construction, pits, basements, trenches, covers, joints and damaged areas. Ground-bearing pressure and outrigger reactions require project-specific engineering checks.
6. Reserve Outrigger Space
Passing through the doorway does not mean the crane can be set up for lifting. The two-section outriggers combine manual extension with hydraulic-cylinder support and have a published maximum extension span of 7000 mm. Actual deployment and allowable lifting conditions must follow the relevant configuration and load information.
7. Validate the Lift Itself
Confirm the load weight, centre of gravity, lifting radius, hook height, rigging arrangement and placement position. An 8-ton class designation is not a guarantee of lifting 8 tonnes at every radius or boom configuration. Final selection must be based on the applicable load chart and operating limits.
Route Survey: From Unloading Point to Exit
A practical workshop access survey should cover the entire movement path. Checking only the destination area can overlook restrictions at the unloading zone, exterior approach, doorway or return route.
| Survey Area | What to Record | Why It Matters |
|---|---|---|
| Unloading point | Available space, ramp gradient, surface condition and edge protection | Determines whether the crane can be unloaded and oriented safely |
| Doorways and gates | Minimum clear width, clear height, threshold and approach angle | Identifies the true opening rather than the nominal door size |
| Aisles and turns | Aisle width, corner geometry, movable equipment and blind spots | Allows assessment of steering corrections and swept clearance |
| Floor and substructure | Slab capacity, voids, pits, drains, covers, cracks and level changes | Supports travel and setup planning for concentrated loads |
| Working position | Outrigger area, load location, radius, lift height and overhead services | Confirms whether the crane can be configured for the planned lift |
| Exit route | Reverse travel, turning area and changes caused by completed work | Ensures the machine can leave after the operation |
Relevant Crane Characteristics
The Onchtech model combines a compact tracked carrier with a telescopic lifting system intended for restricted industrial and construction environments. The following published characteristics help frame an access assessment, although they do not replace model-specific technical documentation or a site survey.
- Overall width: 1.6 m.
- Approximate self-weight: 8.7 tonnes.
- Undercarriage: 350 mm-wide anti-slip rubber tracks, designed to reduce direct surface damage compared with steel track contact while maintaining tracked mobility.
- Boom: five-section high-strength manganese-steel telescopic boom.
- Published working envelope: up to 21 m above-ground lifting height and up to 18 m working radius, subject to the applicable configuration and rated-capacity information.
- Travel control: hydraulic high- and low-speed travel system with fine-control capability.
- Engine options: available engine selections may include Yuchai, Yunnei, Yanmar, Deutz and Cummins, with emissions configurations intended to address requirements such as EU Stage V or EPA standards. Availability must be confirmed for the destination market and selected specification.
- Optional equipment: wireless remote control, moment display and hydraulic fly jib may be available depending on the agreed configuration.
Floor Protection Is Not the Same as Floor Capacity
Rubber tracks can help limit surface marking and distribute the machine’s travelling load over the track contact area. However, this does not establish that a workshop slab is structurally suitable. The 8.7-tonne approximate self-weight is only one part of the assessment.
During lifting, loads are transferred through the outrigger system and can create concentrated reactions. The load weight, radius, crane orientation, outrigger configuration and support arrangement all influence those reactions. Floor capacity should therefore be reviewed by a competent party using confirmed machine and project information.
Areas requiring particular attention: suspended slabs, basement ceilings, service trenches, inspection covers, loading-dock edges, repaired concrete, floor joints and zones close to pits or foundations.
Information Needed to Review an Indoor Machinery Relocation
For a more useful technical discussion, provide measurements and project conditions rather than only the doorway width. A route sketch, dimensioned photographs and lifting details can help identify whether additional verification is required.
- The narrowest measured width and height along the complete route.
- Door-frame details, thresholds, ramps, slopes, steps and level changes.
- Aisle lengths, corner dimensions and required direction changes.
- Locations and heights of beams, pipes, ducts, lights and other overhead restrictions.
- Floor construction, rated capacity and details of pits, voids or underground services.
- Load weight, dimensions, centre of gravity and approved lifting points.
- Required pickup and placement positions, horizontal radius and hook height.
- Available area for outrigger deployment and suitable support materials.
- Any site restrictions involving emissions, ventilation, operating hours, pedestrian control or production shutdowns.
Typical Decision Outcomes
| Finding | Interpretation | Appropriate Next Step |
|---|---|---|
| Opening is close to 1.6 m | No practical clearance is demonstrated by nominal dimensions. | Do not confirm access without exact machine and site measurements. |
| Straight opening is adequate, but a turn is restricted | The static width check does not cover the swept path. | Complete a turning assessment using confirmed machine geometry. |
| Crane can enter, but outriggers cannot be deployed | Transport access exists, but lifting feasibility is not established. | Review another setup position or an alternative lifting method. |
| Route and setup area appear adequate | Physical access may be possible, subject to load and site controls. | Verify the load chart, floor capacity, lift plan and operating requirements. |
Plan the Route Before Confirming the Crane
湖南弘昌机械有限公司 manufactures engineering machinery under the Onchtech equipment brand and supports project-based product consultation and customization cooperation. For an 8-ton spider crane workshop access review, the company can assess submitted route dimensions and lifting requirements against the relevant equipment information.
Final feasibility remains dependent on the selected crane configuration, verified site conditions, applicable load chart, floor assessment and an appropriate lift plan. Product options, emissions configuration, technical parameters and service terms should be confirmed in the corresponding product or project documentation.
Before requesting confirmation, prepare a dimensioned route survey covering the unloading point, every doorway and turn, the lifting position, outrigger area and exit path.
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