DE3238466A1 - Travelling formwork for casing-concrete walls - Google Patents

Abstract

Although disposable casing-concrete formworks made of insulating materials, in particular of rigid foam boards of the lower weight class, are optimally heat-insulating, they are unsuitable as a concrete formwork. These insulating-material formworks are able to offer only insufficient formwork resistance to the high pressure of a fresh concrete mass moved by pouring and vibration. Formwork bulging or formwork fractures can be prevented in this case only if the core concrete is delayed and poured in in small portions. To be able to fill such a soft casing-concrete formwork to wall height at least in two passes - and hence to make it also industrially usable - a dimensionally limited hard formwork unit (travelling formwork according to the patent description) displaceable laterally on rollers is placed over it. After it has resisted the main pressure of the core concrete mass, produced by the filling and vibratory movement, the travelling formwork unit can move on with the filling point, since the soft casing formwork uncovered again thereby is now able to withstand on its own the much lower pressure of the core concrete mass now at rest. A further advantage of the invention is to be seen in that the loading weight of the travelling formwork presses the light casing-concrete formwork down so that it is unable to "float up" during concreting. In this process, the horizontal casing joints are also pressed together so that, even in the case of any subsequent post-shrinkage of the boards, no ... Original abstract incomplete.

Description

Traveling formwork for clad concrete walls

The problem to be solved: The thermal insulation properties of a concrete wall depends exclusively on the thermal resistance of the cladding material. the lighter the jacket material, the higher the thermal insulation properties However, the jacket material also has the permanent task of heat protection in the short term Formwork to be used for pouring concrete.Hler results for all shell concrete wall construction systems an almost unsolvable problem: those jacket insulation materials that provide the best thermal insulation are the least suitable as concrete formwork - and vice versa it is exact And so, as a rule, one resorts to middle-way compromise materials that are contrary to the contrary Naturally, the requirements of the dual task to be solved are only inadequate Measure fair.

The key question is how to get a relatively soft, optimal Shape the insulating jacket material in this way or with economically justifiable aids can solidify the formwork in such a way that it can withstand the overpowering pressure of a "moving" Concrete mass can withstand.

Three "movement components" create that of a lightweight shell formwork Unbearable, overpowering formwork pressure: 1 the concrete fall 2. the concrete flow 3. the concrete vibration.

The concrete fall (1.) i.e. one of more or less height into the Formwork falling concrete exerts an explosive side pressure on impact on the formwork.

The side pressure emanating from the concrete flow (2.) is the most sustainable The more fluid a concrete mass is, the more it loses its self-binding, so that The weight of the concrete mass still presses heavily on the formwork even when it is idle.

The concrete vibration used to compact the concrete. (3.) triggers the vibration point from formwork-pressing concrete concentrations.

Once a pasty-soft (not liquid) concrete mass is in If the formwork is brought in and vibrated, the formwork pressure is reduced immediately to a minimum. The now "resting" i.e. setting and setting concrete presses now hardly any more, so that even a relatively soft shell formwork reduced this Withstands pressure - unless it bulges or is damaged by the moving concrete beforehand has been.

This formwork pressure situation has resulted in shell concrete wall construction systems today almost exclusively by one-time users, i.e. from in-house builders, which pull up the walls of their new building in "self-help".

On such construction sites, which are only busy after work and on weekends the problem of the cladding pressure hardly appears, since the core concrete with a time delay is only introduced in small portfolios.

For the commercial building contractor who has a construction site If you equip it with a construction crane, such slow filling is of no interest prefer a solid hard formwork with large-area elements, which he does without the risk of bulging can fill up quickly.

The solution to the problem: With the innovation - wall formwork for clad concrete walls - the problem is approached in terms of time and location, when and where it occurs means always where the fall-flow- and vibration pressure of the concrete filling acts on the formwork the strongest an additional, slipped-over hard formwork arranged along with it. This traveling formwork according to the innovation moves with the respective filling point, so that where the main one Concrete movement pressure arises and has to be intercepted, always two formwork on top of each other, inside a soft shuttering and a hard shuttering is arranged on the outside.

Together, the two formwork can handle even the strongest concrete pressure Withstand deformation-free.Is a section of formwork filled and vibrated and the non-flowing concrete in the rest position, so the wall formwork can move on to the next Filling section can be rolled on because the casing formwork is subject to reduced pressure of the now calm filler concrete can now withstand alone without deformation.

Technical details of the innovation: In the case of the renewal application, it is assumed that the wall will be built in two sections (rounds) after the lower half of the wall is formed all around with shell concrete elements -and with With the help of the traveling formwork, the second, upper half of the wall is switched on and filled in the same way. Another prerequisite for the renewal application exists in that only soft plastic concrete (consistency K 2 - never liquid) is used and the respective concreting sections are delimited by means of set barriers will.

The traveling formwork unit (Fig. 1 e-p) is prefabricated in two parts brought to the construction site, so it is easy to transport.

Conveniently made of thick plywood or sheet steel (s) Formwork panels can be of different lengths (3-5 meters) while their height about 1.50 m.

The formwork panels (e) are acting as pincer beams (i) Square timber or steel rails screwed or nailed on. Be at the construction site the pre-punched pincer beams connected to the formwork by means of the pincer tabs (g) connected at a precise distance. For this purpose, at the pre-punched pivot points (f) Screw bolts inserted. A reserve hole in the correspondingly long pliers lugs (g) enables setting to a higher jacket wall thickness between the tongs (g) a roller (h) is arranged over a welded strap connection, which enables the further transport of the hiking scarf unit without any problems. the Pincer bars (i) have a central notch at the top, i.e. one about 10 cm deep slot in which the pressure screw unit (k-p) is inserted.

The inserted pressure screw thread is attached to the inner pliers bar (i) on the room side (1) held in place by means of the adjusting nuts (p) tightened on both sides. With the outer adjusting nut (n) the clock data movement; i.e. the bar pressure is locked at the desired point the inside of the outer tong bar (i) is a spacer (m) arranged, which the screw ratchet adjustable to forward and reverse gear (k) so far from the pliers bar (i) that the ratchet operation is not obstructed the screw ratchet (k) is the pressure screw nut (o) which, when actuated Depending on its setting, the screw ratchet (k) presses outwards or for the purpose of opening the pliers is taken back inwards so that the pressure screw thread (1) during the screwing process cannot rise from the outside of the pliers bar notch, it is inserted with a Pen locked.

Miscellaneous: Sheath formwork made of light insulation materials naturally tend conditional on "floating up" on the filler concrete. How cork bark pushes up in water, so light cladding, e.g. made of styrofoam rigid foam, also strives to be on heavy concrete slurry to rise to the top Effective load on the traveling formwork unit at the respective concrete filling point If the traveling formwork is rolled on after the formwork has been filled, it can the exposed concrete lightweight formwork no longer rise, aa its webs or web-like sheath bracing parts are now buoyant-proof in the core concrete are anchored.

In the case of butt, horizontal jacket plate joints, the joint is particularly important very difficult to keep tight with rigid foam cladding panels. This problem also arises solved quite incidentally by the load of the traveling formwork The long edges have become crooked due to the post-curing of the panels the load pressed straight again.

Another advantage brought about by the load on the traveling formwork It can be seen from this that the load on hard foam cladding panels is slight Material upsetting causes the butt joints to remain in place even if there is any material shrinkage no insulation joints that create cold bridges can form the compression compensated for with certainty.

The profitability of the innovation - and thus also the possibility commercial use is particularly easy with rigid foam cladding In order to achieve a somewhat higher formwork strength, here Shell concrete formwork panels with a minimum density of 30 kg / m3 (PS 30 SE) When using the traveling formwork according to the innovation, instead Rigid foam cladding panels with a density of 15 kg / m3 are used DIN 52612, the half as expensive PS 15 SE jacket plates of the same thickness have the same Thermal conductivity (W / m.K 0.040) according to DIN calculated value 4108 like the PS 30 SE jacket plates Without a loss of functional value, it is not only through the innovation application higher formwork strengths can be achieved at the filling point, but also softer ones, i.e. Far cheaper types of shell plates can be used.

Drawing + sign: Fig. 1 = vertical section (1:10 scale) shell formwork parts b-d moving formwork parts e-p a = core concrete approach b = core concrete formwork space c = pre-tensioned WSW spring element d = rigid foam cladding panels tensioned according to the formwork e = wall formwork (plywood sheet, sheet metal, etc.) f = pincer bracket pivot point g = Pincer bracket h = roller (flanged to -g-) i = pincer beam (in wood or Steel) k = screw ratchet over the pressure screw nut (-o-).

1 = pressure screw thread m = spacer washer n = adjusting nut on the outer pliers bar o = pressure nut (in the screw ratchet -k-) p = Adjusting nuts on the inner clamp bar (-i-) Blank page

Claims (4)

P a t e n t a n s r u cfl e 1. Moving formwork for clad concrete walls characterized in that an auxiliary formwork unit (Fig.1), which can be pressed on like pliers, is preferred made of wood building materials or steel components, consisting of formwork panels with a limited area (e) and formwork tongs (f-p) which are located on flanged rollers (h) to the side can move, tipped over a formwork-like weak insulation cladding -and moving with the respective concrete filling point, the shell concrete sub-formwork Reinforced until the concrete movement / formwork pressure triggered by the pouring and vibration subsides, so that the insulation jacket formwork (b-d) behind the auxiliary formwork unit moving on (e-p) the greatly reduced pressure of the core concrete mass that has now come to rest can now resist alone. 2. Traveling formwork for clad concrete walls according to claim 1, characterized in that the weight of the load-bearing traveling formwork unit (e-p) the casing formwork parts (c-d) so that they cannot float when concreting, whereby the moving load the butt-butted horizontal insulation cladding panels (d) compresses in such a way that it is also pressed together in the event of subsequent material shrinkage still stay tight on the joints with certainty. 3: Wall formwork for concrete walls according to claims 1-2, characterized characterized that a wall dimension-reducing compression of the inner cladding formwork (b-d) prevented by the pressure of the erected wall formwork unit (e-p) that the pincer tabs (g) on top and the pre-filled protruding core concrete layer (a) below, serve as a spacer. 4. Traveling formwork for clad concrete walls according to claims 1-3, characterized characterized in that the tong bar (i) by means of the pressure screw unit arranged above (k-p) to the outside - and below the pivot point (f) of the pliers tab (g) to the inside press - and thus the additional concrete counterpressure of the wall formwork unit (e-p) effect and the formwork pressure is canceled by taking back the pressure screw (o) and the traveling formwork unit (e-p) on the flange-mounted rollers (h) can be moved to the next filling point.