{"id":1877,"date":"2026-08-28T22:14:01","date_gmt":"2026-08-28T22:14:01","guid":{"rendered":"https:\/\/silletasimex.com\/?p=1877"},"modified":"2026-08-28T22:14:06","modified_gmt":"2026-08-28T22:14:06","slug":"spacer-chairs-precast-elements","status":"publish","type":"post","link":"https:\/\/silletasimex.com\/en\/silletas-espaciadores-elementos-prefabricados\/","title":{"rendered":"Chairs and spacers in modular construction: precision from the mold"},"content":{"rendered":"

Modular construction has transformed the way different elements of a project are manufactured and executed. By moving part of the construction process to a controlled environment, it is possible to improve organization, standardize procedures, and manufacture components that will later be transported and installed at the project site.<\/p>\n\n\n\n

Within this process, the molds fulfill a fundamental function. They are responsible for defining the geometry and dimensions of the element being manufactured, while the reinforcing steel must remain in the position established by the design. This is where the chairs and spacers for construction<\/strong> acquire special importance.<\/p>\n\n\n\n

Although they may seem like small components compared to the size of a module, panel, wall, or prefabricated element, these accessories help control the position of the steel and the concrete cover during manufacturing.<\/p>\n\n\n\n

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What function do the chairs serve within a mold?<\/strong><\/p>\n\n\n\n

When a reinforced concrete element is manufactured using a mold, the steel must be placed at a specific distance from the surfaces of the element.<\/p>\n\n\n\n

A concrete spacer<\/strong> It functions as a support point to elevate and hold the reinforcement relative to the bottom surface of the mold. In this way, it helps to maintain the position of the steel during the different manufacturing stages.<\/p>\n\n\n\n

The goal is not simply to keep the rod raised. The main function is to help achieve the concrete cover<\/strong> specified by the project and maintaining a stable configuration before and during the pour.<\/p>\n\n\n\n

In modular or prefabricated manufacturing systems, this precision can be especially relevant because the elements are produced following previously defined dimensions and specifications.<\/p>\n\n\n\n

<\/p>\n\n\n\n

Spacers: distance control within the modular system<\/strong><\/p>\n\n\n\n

In addition to the chairs, there are different types of construction spacers<\/strong> intended to maintain specific distances between the steel, the formwork, and other components of the reinforcement.<\/p>\n\n\n\n

Depending on the design of the element, horizontal, vertical, or specific solutions for certain steel configurations can be used.<\/p>\n\n\n\n

In a modular process, correctly selecting these components makes it possible to turn steel positioning into a more standardized activity. This makes it easier for different parts manufactured under the same specifications to maintain consistent assembly criteria.<\/p>\n\n\n\n

The choice must be made considering the type of element, steel diameter, required cover, mold geometry, and manufacturing conditions.<\/p>\n\n\n\n

<\/p>\n\n\n\n

Why avoid makeshift solutions in molds?<\/strong><\/p>\n\n\n\n

One of the advantages of modular construction is precisely the ability to control and repeat processes. Therefore, using stones, concrete fragments, wood, or other improvised materials as supports can go against that objective.<\/p>\n\n\n\n

An irregular support can modify the height of the steel or shift during the handling of the reinforcement cage and pouring. In a part manufactured inside a mold, a small variation can be repeated in multiple units if the process is not properly standardized.<\/p>\n\n\n\n

The construction chairs<\/strong> manufactured specifically for this function, they allow for the establishment of support points with known dimensions and facilitate the repeatability of the process.<\/p>\n\n\n\n

This is especially useful when producing large quantities of panels, modules, or prefabricated components.<\/p>\n\n\n\n

Chairs and spacers in precast elements<\/strong><\/p>\n\n\n\n

The manufacturing of prefabricated and modular elements requires coordinating different activities: mold preparation, steel placement, accessory installation, dimensional inspection, casting, vibration, demolding, and transfer.<\/p>\n\n\n\n

During this process, the steel may be subject to movements before the concrete reaches the conditions necessary to stabilize it.<\/p>\n\n\n\n

The steel spacers<\/strong> they help keep the reinforcement in the intended position, provided that the appropriate product is selected and placed according to the project's needs.<\/p>\n\n\n\n

In elements such as panels, walls, slabs, prefabricated foundations, or other reinforced concrete components, the solution can vary considerably. Therefore, there is no single chair that is suitable for all systems.<\/p>\n\n\n\n

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Coating also matters in modular construction<\/strong><\/p>\n\n\n\n

One of the aspects that must be controlled during manufacturing is the steel coating<\/strong>.<\/p>\n\n\n\n

The cover corresponds to the distance between the concrete surface and the reinforcing steel. Its value depends on the characteristics of the element, the exposure conditions, and the criteria established by the design and applicable standards.<\/p>\n\n\n\n

When the steel moves toward the surface, the cover can be reduced compared to what is specified. Conversely, placing the supports without considering the dimensions of the element can also alter the intended position of the reinforcement.<\/p>\n\n\n\n

Therefore, chairs and spacers must be considered starting from the mold planning stage and not as an accessory that is added at the end.<\/p>\n\n\n\n

<\/p>\n\n\n\n

How to choose pedestals for modular construction?<\/strong><\/p>\n\n\n\n

Before selecting a chair or spacer, it is recommended to review the specific characteristics of the element to be manufactured.<\/p>\n\n\n\n

Among the factors that must be considered are:<\/p>\n\n\n\n

    \n
  • The type of prefabricated or modular element.<\/li>\n\n\n\n
  • The diameter and configuration of the reinforcing steel.<\/li>\n\n\n\n
  • The coating indicated in the drawings.<\/li>\n\n\n\n
  • The geometry and dimensions of the mold.<\/li>\n\n\n\n
  • The weight of the armor.<\/li>\n\n\n\n
  • The installation and handling conditions.<\/li>\n\n\n\n
  • The casting and vibrating procedure.<\/li>\n\n\n\n
  • The quantity and distribution of the support points.<\/li>\n<\/ul>\n\n\n\n

    With this information it is possible to determine what construction chairs<\/strong> and which spacers fit best for each application.<\/p>\n\n\n\n

    <\/p>\n\n\n\n

    From on-site construction to controlled manufacturing<\/strong><\/p>\n\n\n\n

    One of the main characteristics of modular construction is that a significant part of the work can be carried out under controlled conditions. This opens up the possibility of standardizing materials, procedures, and quality controls.<\/p>\n\n\n\n

    The chairs and spacers are part of that logic.<\/p>\n\n\n\n

    Instead of resolving the steel position differently in each mold, using components designed for a specific function allows for the establishment of repeatable procedures.<\/p>\n\n\n\n

    For example, a plant can define what type of spacer to use for a given panel thickness, what height corresponds to each coating, and how to distribute the support points. This facilitates staff training and process supervision.<\/p>\n\n\n\n

    <\/p>\n\n\n\n

    What mistakes should be avoided?<\/strong><\/p>\n\n\n\n

    Among the most common errors are selecting a chair that does not correspond to the required height, using too few support points, placing the spacers without an adequate distribution, or using improvised materials that were not designed to support the reinforcement assembly.<\/p>\n\n\n\n

    It is also important to check the reinforcement assembly before pouring. A prior inspection makes it possible to detect displacements, unstable supports, or positional discrepancies before the concrete is poured.<\/p>\n\n\n\n

    In repetitive production processes, this review can be integrated as part of a checklist for each mold.<\/p>\n\n\n\n

    <\/p>\n\n\n\n

    A small part for a high-precision process<\/strong><\/p>\n\n\n\n

    Modular construction relies on repeatability. Each element must be manufactured according to previously established dimensions and specifications so that it can later be transported, assembled, and correctly integrated into the project.<\/p>\n\n\n\n

    Inside the molds, the chairs and spacers for construction<\/strong> help to keep the steel in the intended position and to control the concrete cover.<\/p>\n\n\n\n

    They do not replace structural design or project specifications, but they are part of the resources used to correctly execute the assembly.<\/p>\n\n\n\n

    In SIMEX<\/strong> you will find solutions for different construction applications, designed to facilitate steel positioning and improve process standardization.<\/p>\n\n\n\n

    Because in modular construction, precision begins long before arriving at the job site: it begins inside the mold.<\/p>\n\n\n\n

    Contact us for advice, we have the certified parts your project requires.<\/p>","protected":false},"excerpt":{"rendered":"

    Discover how to choose chairs and spacers for modular construction forms, keep the steel in position, and control the concrete cover.<\/p>","protected":false},"author":1,"featured_media":1878,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[72,74,73,71,79,70],"class_list":["post-1877","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-acero","tag-arquitectura","tag-concreto","tag-construccion","tag-ingenieria","tag-silleta"],"_links":{"self":[{"href":"https:\/\/silletasimex.com\/en\/wp-json\/wp\/v2\/posts\/1877","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/silletasimex.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/silletasimex.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/silletasimex.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/silletasimex.com\/en\/wp-json\/wp\/v2\/comments?post=1877"}],"version-history":[{"count":1,"href":"https:\/\/silletasimex.com\/en\/wp-json\/wp\/v2\/posts\/1877\/revisions"}],"predecessor-version":[{"id":1880,"href":"https:\/\/silletasimex.com\/en\/wp-json\/wp\/v2\/posts\/1877\/revisions\/1880"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/silletasimex.com\/en\/wp-json\/wp\/v2\/media\/1878"}],"wp:attachment":[{"href":"https:\/\/silletasimex.com\/en\/wp-json\/wp\/v2\/media?parent=1877"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/silletasimex.com\/en\/wp-json\/wp\/v2\/categories?post=1877"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/silletasimex.com\/en\/wp-json\/wp\/v2\/tags?post=1877"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}