{"id":2570,"date":"2026-10-02T17:20:34","date_gmt":"2026-10-02T15:20:34","guid":{"rendered":"https:\/\/cad-kompass.de\/?page_id=2570"},"modified":"2026-10-13T07:14:02","modified_gmt":"2026-10-13T05:14:02","slug":"themenfeld-3-bevor-das-erste-bauteil-entsteht","status":"publish","type":"page","link":"https:\/\/cad-kompass.de\/?page_id=2570","title":{"rendered":"Bevor das erste Bauteil entsteht (Tf 3)"},"content":{"rendered":"\n<!-- CAD-Kompass, 05-BIM, Themenfeld 3: \u00dcbersicht. 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}\n    .cad-page .cad-card--seite .cad-card-title { margin-bottom: 14px; min-height: 2.6em; }\n    .cad-page .cad-card--seite .cad-card-footer { padding: 16px 20px 20px; }\n    .cad-page .cad-zurueck { font-size: 0.9rem; color: #64748b; border-top: 1px solid #d0d0d0; padding-top: 14px; }\n    .cad-page a { color: #2d4d63; }\n    @media (max-width: 900px) {\n        .cad-page .cad-cards { gap: 16px; margin: 0 0 40px; }\n    }\n<\/style>\n<div class=\"cad-page\">\n    <h1 class=\"cad-page-title\">BIM im Tiefbau &#124; Bevor das erste Bauteil entsteht<\/h1>\n    <div class=\"cad-intro\">\n        <div class=\"cad-intro-header\"><span>Warum Lage und Bestandsdaten vor dem ersten Bauteil gekl\u00e4rt sein m\u00fcssen<\/span><\/div>\n    <\/div>\n    <p class=\"cad-lead\">Die drei Seiten dieses dritten von sechs Themenfeldern kl\u00e4ren, was vor dem ersten Bauteil feststehen muss: in welchem Koordinatensystem und mit welchem H\u00f6henbezug das Modell liegt, und warum eine Strecke darin nie ganz die erwartete L\u00e4nge hat. Dazu geht es um Bestandsdaten vom Auftraggeber, die drei Zahlen brauchen, um brauchbar zu sein, und um Leitungsausk\u00fcnfte und Bohrungen, aus denen im Modell ein Korridor mit Unsicherheit wird.<\/p>\n    <p class=\"cad-lead\">Wer gerade ein fremdes Modell ge\u00f6ffnet hat, das an der falschen Stelle liegt, f\u00e4ngt bei \u201eWo das Modell liegt\u201c an, weil dort steht, welche vier Angaben ein Modell \u00fcberhaupt am richtigen Ort halten. Wer Bestandsdaten vom Auftraggeber bekommen hat und wissen will, ob er damit arbeiten kann, beginnt bei \u201eBestandsdaten annehmen\u201c.<\/p>\n    <p class=\"cad-legende\">Die K\u00fcrzel nennen die Pfade, auf denen die Seite liegt: GF Gesch\u00e4ftsf\u00fchrung und Akquise, PL Projektleitung und Koordination, KM Konstruktion und Modellierung. Der Haken merkt sich nur in deinem Browser, was du gelesen hast.<\/p>\n\n    <div class=\"cad-cards-titel\">Die Seiten<\/div>\n    <div class=\"cad-cards\">\n        <div class=\"cad-card cad-card--seite cad-card--start\" data-seite=\"C1\" id=\"C1\">\n            <button type=\"button\" class=\"cad-check\" data-check=\"C1\" aria-pressed=\"false\" aria-label=\"Wo das Modell liegt als gelesen markieren\" title=\"Als gelesen markieren\"><svg viewBox=\"0 0 20 20\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M5 10l3.5 3.5L15 6\"\/><\/svg><\/button>\n            <div class=\"cad-card-header\">\n                <div class=\"cad-card-step\">Seite 1 &middot; KM<\/div>\n                <div class=\"cad-card-title\">Wo das Modell liegt<\/div>\n            <\/div>\n            <div class=\"cad-card-divider\"><\/div>\n            <div class=\"cad-card-footer\"><a href=\"https:\/\/cad-kompass.de\/?p=2593\" class=\"cad-card-btn\">Wo das Modell liegt<\/a><\/div>\n        <\/div>\n        <div class=\"cad-card cad-card--seite\" data-seite=\"C2\" id=\"C2\">\n            <button type=\"button\" class=\"cad-check\" data-check=\"C2\" aria-pressed=\"false\" aria-label=\"Bestandsdaten annehmen als gelesen markieren\" title=\"Als gelesen markieren\"><svg viewBox=\"0 0 20 20\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M5 10l3.5 3.5L15 6\"\/><\/svg><\/button>\n            <div class=\"cad-card-header\">\n                <div class=\"cad-card-step\">Seite 2 &middot; PL<\/div>\n                <div class=\"cad-card-title\">Bestandsdaten annehmen<\/div>\n            <\/div>\n            <div class=\"cad-card-divider\"><\/div>\n            <div class=\"cad-card-footer\"><a href=\"https:\/\/cad-kompass.de\/?p=2595\" class=\"cad-card-btn\">Bestandsdaten annehmen<\/a><\/div>\n        <\/div>\n        <div class=\"cad-card cad-card--seite\" data-seite=\"C3\" id=\"C3\">\n            <button type=\"button\" class=\"cad-check\" data-check=\"C3\" aria-pressed=\"false\" aria-label=\"Sparten und Baugrund als gelesen markieren\" title=\"Als gelesen markieren\"><svg viewBox=\"0 0 20 20\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M5 10l3.5 3.5L15 6\"\/><\/svg><\/button>\n            <div class=\"cad-card-header\">\n                <div class=\"cad-card-step\">Seite 3 &middot; KM<\/div>\n                <div class=\"cad-card-title\">Sparten und Baugrund<\/div>\n            <\/div>\n            <div class=\"cad-card-divider\"><\/div>\n            <div class=\"cad-card-footer\"><a href=\"https:\/\/cad-kompass.de\/?p=2597\" class=\"cad-card-btn\">Sparten und Baugrund<\/a><\/div>\n        <\/div>\n    <\/div>\n\n    <div class=\"cad-cards-titel\">Nachschlagen<\/div>\n    <div class=\"cad-cards\">\n        <div class=\"cad-card\">\n            <div class=\"cad-card-header\"><div class=\"cad-card-step\">Werkzeug<\/div><div class=\"cad-card-title\">Projektma\u00dfstab-Rechner<\/div><\/div>\n            <div class=\"cad-card-divider\"><\/div>\n            <div class=\"cad-card-icon\"><svg viewBox=\"0 0 48 48\" fill=\"none\" stroke=\"#3f5f75\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><rect x=\"9\" y=\"8\" width=\"30\" height=\"32\" rx=\"2\"\/><line x1=\"15\" y1=\"16\" x2=\"33\" y2=\"16\"\/><line x1=\"15\" y1=\"24\" x2=\"20\" y2=\"24\"\/><line x1=\"24\" y1=\"24\" x2=\"29\" y2=\"24\"\/><line x1=\"33\" y1=\"24\" x2=\"33\" y2=\"24\"\/><line x1=\"15\" y1=\"31\" x2=\"20\" y2=\"31\"\/><line x1=\"24\" y1=\"31\" x2=\"29\" y2=\"31\"\/><line x1=\"33\" y1=\"31\" x2=\"33\" y2=\"31\"\/><\/svg><\/div>\n            <div class=\"cad-card-body\"><p class=\"cad-card-text\">Der Rechner zeigt, wie viele Zentimeter Zone und H\u00f6he auf deiner Strecke ausmachen und ab wie vielen Metern die Grenzabweichung erreicht ist, auf die sich das deutsche Regelwerk beruft. Voreingestellt mit einem Rechenbeispiel, jede Zahl offen nachvollziehbar.<\/p><\/div>\n            <div class=\"cad-card-footer\"><div class=\"cad-card-footer-divider\"><\/div><a href=\"https:\/\/cad-kompass.de\/?p=2601\" class=\"cad-card-btn\">Rechner \u00f6ffnen<\/a><\/div>\n        <\/div>\n        <div class=\"cad-card\">\n            <div class=\"cad-card-header\"><div class=\"cad-card-step\">Datenblatt<\/div><div class=\"cad-card-title\">Datenblatt Bezugssysteme<\/div><\/div>\n            <div class=\"cad-card-divider\"><\/div>\n            <div class=\"cad-card-icon\"><svg viewBox=\"0 0 48 48\" fill=\"none\" stroke=\"#3f5f75\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><rect x=\"7\" y=\"10\" width=\"34\" height=\"28\" rx=\"2\"\/><line x1=\"7\" y1=\"19\" x2=\"41\" y2=\"19\"\/><line x1=\"7\" y1=\"28\" x2=\"41\" y2=\"28\"\/><line x1=\"19\" y1=\"10\" x2=\"19\" y2=\"38\"\/><\/svg><\/div>\n            <div class=\"cad-card-body\"><p class=\"cad-card-text\">Das Datenblatt sammelt Zonen, EPSG-Codes, Ma\u00dfstabstabellen, H\u00f6henstatus und die Stufen der Georeferenz, jede Zeile mit Fundstelle und Pr\u00fcfdatum. Wer eine Bieterfrage zu Lage oder H\u00f6he formuliert, findet hier den genauen Wortlaut.<\/p><\/div>\n            <div class=\"cad-card-footer\"><div class=\"cad-card-footer-divider\"><\/div><a href=\"https:\/\/cad-kompass.de\/?p=2599\" class=\"cad-card-btn\">Datenblatt \u00f6ffnen<\/a><\/div>\n        <\/div>\n        <div class=\"cad-card\">\n            <div class=\"cad-card-header\"><div class=\"cad-card-step\">Nachschlagen<\/div><div class=\"cad-card-title\">BIM-Lexikon<\/div><\/div>\n            <div class=\"cad-card-divider\"><\/div>\n            <div class=\"cad-card-icon\"><svg viewBox=\"0 0 48 48\" fill=\"none\" stroke=\"#3f5f75\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><rect x=\"9\" y=\"8\" width=\"30\" height=\"32\" rx=\"2\"\/><line x1=\"15\" y1=\"17\" x2=\"33\" y2=\"17\"\/><line x1=\"15\" y1=\"24\" x2=\"33\" y2=\"24\"\/><line x1=\"15\" y1=\"31\" x2=\"26\" y2=\"31\"\/><\/svg><\/div>\n            <div class=\"cad-card-body\"><p class=\"cad-card-text\">Alle Begriffe, auch die aus Vortrag und Verkaufsgespr\u00e4ch. Zu jedem: was gemeint ist, was es im Tiefbau hei\u00dft, wo es hier weitergeht.<\/p><\/div>\n            <div class=\"cad-card-footer\"><div class=\"cad-card-footer-divider\"><\/div><a href=\"https:\/\/cad-kompass.de\/?p=2641\" class=\"cad-card-btn\">Lexikon \u00f6ffnen<\/a><\/div>\n        <\/div>\n    <\/div>\n\n    <p class=\"cad-zurueck\">Zur\u00fcck zur <a href=\"https:\/\/cad-kompass.de\/?page_id=2564\">\u00dcbersicht BIM<\/a>, dort liegen die anderen f\u00fcnf Themenfelder, die Weiche nach Rolle und der Selbstcheck.<\/p>\n<\/div>\n\n<script>\n    (function () {\n        'use strict';\n        \/* Lesestatus: derselbe Schluessel wie im Hub, der Haken bleibt nur im Browser *\/\n        var K_GELESEN = 'cadk_bim_gelesen_v1';\n        function liesGelesen() {\n            try {\n                var raw = localStorage.getItem(K_GELESEN);\n                if (!raw) { return []; }\n                var a = JSON.parse(raw);\n                return Object.prototype.toString.call(a) === '[object Array]' ? a : [];\n            } catch (e) { return []; }\n        }\n        function schreibGelesen(a) {\n            try { localStorage.setItem(K_GELESEN, JSON.stringify(a)); } catch (e) {}\n        }\n        function maleHaken() {\n            var gelesen = liesGelesen();\n            var karten = document.querySelectorAll('.cad-card[data-seite]');\n            Array.prototype.forEach.call(karten, function (card) {\n                var on = gelesen.indexOf(card.getAttribute('data-seite')) !== -1;\n                if (on) { card.classList.add('cad-card--done'); } else { card.classList.remove('cad-card--done'); }\n                var btn = card.querySelector('[data-check]');\n                if (btn) { btn.setAttribute('aria-pressed', on ? 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