Add a construction hoist to the scaffold

You work for [your company name], a construction company in [city, province], with the TektonAI tools connected to this conversation.

What the TektonAI tools do:
- Scaffold prepares 3D scaffold plans from the dimensions of the structure, or from the architect's IFC model or PDF drawing: dimensioned A3 PDF plan, calculation note, bill of materials in Excel and CSV, 3D model (STEP) and CAD plan (DXF). It revises an existing plan from its drawing number.
- My Equipment is our company's parts library: references, dimensions and weights. It imports our parts list.
- Scaffold plans use the parts of our library in My Equipment when we ask.
- Fencing draws the site fence plan from the perimeter, or around a Scaffold scaffold along a street, with the public walkway: PDF plan, bill of materials in Excel and CSV, and the site's wind per NBC 2020.
- Parts & Materials keeps the catalogue of common building materials (drywall, lumber, insulation, hardware…) with our own items, and produces PDF and Excel catalogues from it. When I ask for a family, give only that family; accessories only when I ask for them.
- Codes gives the exact text of Québec and Canadian construction codes and regulations (NBC, Construction Code, CSTC, LSST…), with its edition and citation.

How to work with me:
- Answer in English, in plain words and site terms. Produce documents (plans, calculation notes, catalogues) in English.
- Use the TektonAI tools for every plan, quantity or weight. Never make up a dimension, a quantity or a weight.
- Produce the plan directly, without asking me to approve it: we correct it later with a revision if needed. If a piece of data is missing, let the tool ask me its questions in its form; do not ask them yourself.
- When a tool asks me a question through a form, let me answer it myself. Never choose the duty class (light, intermediate or heavy) for me.
- Leave plans at the “PRELIMINARY” status until I give you the names of the person who checked the plan and the person who approved it.
- For an import into My Equipment, show me the preview, then import the list and give me the summary.
- Remind me that plans are preliminary: a competent person must check them before erection.

A construction hoist carries workers and material up the building. Scaffold draws it in the same plan as the façade scaffold, with a landing at each platform.

Julie Exemple, of Entreprise Démo TektonAI, takes the 3-storey sixplex from Combine the modules: a 16.2 m (53’-2”) façade on the street, in Montréal. She wants a construction hoist up to the top platform, at 8.85 m (29’-0”).

What you need

• Scaffold connected to your company.
• The dimensions of the façade, as for any scaffold plan: see Create a 3D scaffold plan.
• The hoist manufacturer’s sheet, if you have it: the car, the mast ties and the maximum load. Without it, the plan still comes out and says what it does not check.

Step 1: ask for the scaffold and the hoist in the same plan

Open a conversation in your TektonAI project. Describe the façade, then add the hoist in the same request.

Draw the frame scaffold plan for the street façade of our 3-storey sixplex in Montréal, with the parts from our inventory. The façade is 16.2 m long, between two party walls. We work over the full height, up to 10.35 m. The parapet coping is at 10.2 m and projects 50 mm. Scaffold 300 mm from the wall, light duty load class. In the same plan, add a construction hoist up to the top platform, at 8.85 m, in front of the scaffold on the street side, 6 m from the left end.

Scaffold sends a single form with all its questions, about the façade and about the machine. When a question has a proposed answer, TektonAI gives its reason. You confirm the answer or change it: the tool never picks a detail for you. Julie answers as in “Combine the modules”: 8.85 m (29’-0”) for the top platform, “no” for the terrain and “Normal” for the importance category.

Julie said where the machine stands: in front of the scaffold, street side, 6,000 mm (19’-8”) from the left end of the scaffold. Scaffold places the machine where you say. Without this position, the plan still comes out, but the machine is placed neither in the 3D model nor in the render; the bill of materials counts it and a line of the plan says so.

Scaffold produces the plan:

Drawing ECH-261104-722F, revision A (preliminary)

Frame scaffold (tubular)

• […]: 15 850 x platform +8.850; bays 4 x 3048 + 2134 + 1524; platforms +1.128, +3.059, +4.989, +6.920, +8.850; top +9.917
• Construction hoist: top landing +8.850; landings +0.000, +1.128, +3.059, +4.989, +6.920, +8.850; top +11.150
• Total: 459 parts, 3372 kg (source of each weight in the bill of materials; weight of the construction hoist not included: manufacturer’s sheet not provided)

The hoist has a landing at each platform of the façade, plus its base on the ground (+0.000). Its 15 parts are those of the machine:

• the base;
• the mast;
• the car;
• 6 landing walkways;
• 6 landing gates.

They have no weight on the plan: their dimensions and weights are those of the manufacturer’s sheet.

The PDF plan says where the machine stands:

Machine placed in front of the scaffold, street side, 6,000 mm from the left end (value provided by the user).

It worked when: The plan has two lines under the same ECH- number: the façade and the construction hoist.

Step 2: read the hoist sheet

Sheet 4 draws the hoist in plan view, layout plan and right side view, with its bill of materials. The mast is drawn as a lattice, the car is open-sided, and each landing has its landing gate. In the bill of materials, the dimensions of the parts are “Per the manufacturer’s sheet”.

The plan names the standard for the machine:

Construction hoist designed and manufactured per CSA Z185 (CSTC, s. 2.15.14).

Then read what the plan does not check. For the hoist, Scaffold’s answer says:

• Engineer’s drawings required by CSTC 2.4.1, para. 3, not provided: signed and sealed installation drawings, with the dismantling procedure, to be sent to the CNESST before installation.
• Machine not specified: construction hoist used (CSTC, s. 2.15.14).
• Car not checked: manufacturer’s sheet not provided.
• Mast ties to the building not drawn: manufacturer’s sheet not provided.
• Maximum load allowed not stated: manufacturer’s sheet not provided.
• Tie force not stated: manufacturer’s sheet not provided.

Scaffold’s plan does not replace the engineer’s drawings. Before installation, the engineer signs and seals the installation drawings, with the dismantling procedure. You then send them to the CNESST (Québec’s workplace health and safety board).

The façade’s points to note are those of the scaffold alone. Between the two party walls, for example, the scaffold leaves 115 mm (4 1/2”) of façade at the right end: no combination of bays covers that end without the sole plate crossing the limit.

It worked when: Scaffold's answer says "Engineer's drawings required by CSTC 2.4.1, para. 3, not provided".

Step 3: answer the questions about the machine

The form from step 1 has 17 questions. Those about the hoist ask for:

• the machine: construction hoist (CSA Z185) or mast climbing transport platform (CSA B354.12);
• the car width and depth, according to the manufacturer’s sheet;
• the vertical spacing of the mast ties. Without an answer, the ties are not drawn;
• the car’s maximum load allowed, which is printed on the plan;
• the force a mast tie transmits to the building, which is printed for the pull-out test of the ties;
• the weight of each part of the machine: the base, the mast, the car, the walkway and the landing gate. Without it, the bill of materials total leaves these parts out.

The other questions are those of any plan, such as the soil capacity and the capacity of your parts.

These values come from a source: TektonAI does not guess them. Take them from the manufacturer’s sheet or plate, for example for the question “According to the manufacturer’s sheet, what is the car width, along the façade?” Your assistant does not answer for you. Without an answer, the plan says so in one line.

Julie does not have the sheet yet: she leaves these questions empty, and the plan keeps the lines of step 2. When she has it, her answers will add the checks through a revision of the plan. See Revise a plan.

It worked when: The form asks you for the car width according to the manufacturer's sheet.

Step 4: check the plan

The plan’s QR code opens TektonAI’s verification page. For this plan, it shows:

Authentic document

Signed content: ECH-261104-722F rev. A · client not specified · 3-storey sixplex, street façade and construction hoist · 459 parts · 3 372 kg · top platform 8.850 m

See Check that a TektonAI plan is authentic.

It worked when: The page says "Authentic document", with the same drawing number as the sheet.

Step 5: ask for a realistic render

To show the site to your client, ask for a realistic image of the plan:

Make a realistic render of plan ECH-261104-722F.

Scaffold produces two images of the plan’s 3D model: the project view and the catalogue view. Allow about 8 minutes. Your assistant follows the render and gives you the links to both images as soon as they are ready. They are then added to the plan’s files.

The image shows the plan’s 3D model, without the building. It is for presenting the site: the dimensions and parts are still those of the PDF plan.

It worked when: You received both images, and the project view shows the scaffold and the hoist.

Special cases

• You use a mast climbing transport platform: choose it at the question about the machine. The CSTC does not set the same rules for it as for a construction hoist (ss. 2.15.14 and 2.15.18).
• You do not have the manufacturer’s sheet: the plan draws the machine as an outline, without ties, and says so.
• Your client needs French documents: ask for them in French in the conversation. Otherwise, documents follow the language of your profile.

Good to know

• If your My Equipment library does not have the parts of your hoist, the plan keeps generic parts and says so in its points to note.
• The plan is not approved: a competent person checks and approves it before erection.
• No tool gives prices.