DE102009016692A1 - Mobile bed for precast concrete elements with prestressed reinforcement - Google Patents

Abstract

Fitted bed for the production of pre-stressed concrete precast elements, in the cross section of a number of prestressed reinforcing strands are accommodated, which is arranged on a Schaltisch, the tensioning bed, regardless of its attachment to the Schaltisch or a circulation plate intrinsically stable and easily transportable.

Description

The The invention relates to a mobile bed for precast concrete elements with prestressed reinforcement according to the preamble of claim 1.

It is known, precast concrete elements in the precast plant thereby that the precast concrete element on the surface of a Circulation pallet is made, in a known manner, the circulation pallet a tensioning frame to the prestressed reinforcement strands under prestress in the clamping frame. On the surface of this Circulation pallet is then poured the precast concrete, so that the prestressed Rebars are included in the precast concrete and after curing of ready-mixed concrete, pre-stress the prefabricated concrete section.

The However, arrangement of a clamping frame on the circulation pallet has the Disadvantage that high pressure forces must be absorbed by the clamping frame. It Therefore, front and back large profile bars used as an abutment for the there to be absorbed and to be held under prestressing reinforcement strands serve. The reinforcement strands are provided with a suitable pulling device pulled through the abutment bar and stretched to a Tensile force of z. B. 180 kgN per strand to produce.

in this connection There is the disadvantage that the leadthrough in the tenter in vertical Direction is asymmetrical. The clamping frame is namely on the surface of Circular pallet attached. However, the reinforcement strands must be in the lower foot area the profile beams are arranged to be in the material of the ready-mixed concrete to be embedded.

Because of this (relative to a vertical) decentralized - outside the center of gravity of the profile beam - acting tensile forces have to the profile beams are suitably reinforced to the occurring To absorb buckling and bending forces. this leads to to that such a tenter at a size of about 4 × 16 m to weighs to 15 t.

Of the The invention is therefore based on the object, a clamping device for circulating pallets the educate the aforementioned type so that they are much smaller is formed, cheaper can be produced and freely implemented.

to solution the task is the invention by the technical teaching of claim 1.

essential Feature of the invention is that instead of the known tenter, which was firmly connected to the circulation pallet, a mobile fitted bed is used, which simply put on the surface of the circulation pallet becomes.

In order to becomes a self-stable mobile (so easy to implement) Fitted bed created, which is no longer on the connection with the circulation pallet is dependent, because it is free of a circulation pallet to the other, because all the stresses acting in the mobile fitted bed itself.

Instead of a firmly connected to the circulation pallet stretcher proposes the invention now before, a self-supporting and independent from the tenter to use in self-stiffened fitted bed. This is accordingly easily transportable and no longer on the attachment with the Instructed circulation pallet.

In A preferred embodiment of the present invention is provided that the clamping bed according to the invention of two mutually opposite Abutment plates exists between which one or more abutment profiles are arranged, which by means of a clamping device, the two Press abutment plates against each other.

in the lower part of each abutment plate are one or more strand-like or wire-like or rod-like reinforcing elements are arranged, opposite respectively associated with the respective abutment plate tension elements are assigned, which also consists of strands, wires or rod-shaped elements consist.

With the given technical teaching, the advantage is now achieved for the first time that the abutment plates with the intermediate abutment profiles are statically balanced in itself, because the underlying wire-like or strand-like reinforcing elements are now according to the invention compared to upper tension elements, which with the abutment plates 7 . 8th are connected and take the same train, as comparatively the lower reinforcing elements.

In order to can the reinforcing elements - like recognized as disadvantageous in the prior art - not the abutment plates on bending or tilting claim, because of this bend or Tilting are now opposite to the overhead tension elements, which transmit the same train how comparatively he acts on the lower reinforcement elements.

The actual pulling force is thus between the abutment plates on the middle in between transmitted orderly abutment profiles, which press with a clamping device against the respective abutment plate.

For training There are various embodiments of the tensioning device, all of which are essential to the invention to be encompassed by the present invention.

In a first embodiment, it is provided that at a front, free end of an abutment profile arranged a clamping device is, with one side on the front side of the abutment profile and pressed with the other end face on the abutment plate.

A Such tensioning device is preferably designed as a piston hydraulic cylinder device.

Instead of However, such a piston-cylinder device can also other clamping devices be used, in particular mechanical or electromotive Clamping devices.

When Mechanical clamping device is available mechanically or by motor Screw devices.

As well can Eccentric jigs can be used by hand or motorized or hydraulically operated become.

In In a further embodiment it can be provided that the pulling device from the outside engages the abutment plate and the abutment plate of the Pull away abutment profile.

For this embodiment it is then envisaged that in the resulting distance between the front side of the abutment profile and the inside of the abutment plate a suitable wedge or other compensation element is taken, around the two abutment plates by interposition of the abutment profile to keep apart on compressive force.

Important in all embodiments is that each table near the top of the circulation pallet arranged reinforcing elements, which are poured into the precast concrete part are now, according to the invention opposite each other at the respective abutment plate a tension element is assigned, which transmits the same tensile forces as the Reinforcement elements cast in the concrete.

In order to always centric pressure forces The abutment plates produced without causing an undesirable Bending or tilting of the abutment plates comes.

While the tensile forces So over transfer the upper tension elements and the lower reinforcement elements be, the pressure forces over the intervening transferred abutment profiles.

In order to is it possible for the first time to make such a fitted bed mobile (easily transportable), because it is - like executed above - static balanced in itself and can be modular as a package from the surface of each any circulation pallet transported to another circulation pallet and placed there and included in the work process.

As well This results in the advantage that several clamping beds next to each other can be arranged in a modular manner where the one clamping bed can look quite different than the other, adjacent fitted bed. This results in a variety of alternative ways if z. B. the leadership the tensile and the reinforcing elements in the one fitted bed of the guide the tension and reinforcement elements deviate in the adjacent tensioning bed.

In order to For the first time, the possibility arises that you ribbed plates or individual carriers with on different Heights arranged reinforcing elements can bias, which previously only with great effort in the known Clamping frame possible was.

• – zwei Stahlplatten als Widerlager am jeweiligen Ende der Einheit
• – einem Druckrohr zwischen den beiden Stahlplatten
• – einem Hydraulikzylinder in der Achse des Druckrohrs befestigt an einer der Stahlplatten

Instead of a large tenter, smaller units are used. These mobile clamping units are composed of the following components:

• - Two steel plates as an abutment at each end of the unit
• - a pressure tube between the two steel plates
• - A hydraulic cylinder in the axis of the pressure tube attached to one of the steel plates

The Steel plates form the abutment yoke for receiving the strands Your anchors. Therein are the openings for the proper installation the permanent one and temporary anchor sleeves appropriate. The steel plates are on the bottom of the formwork and determine thus the altitude the exciting strands.

The later einzubetonierenden in the component strands are arranged in the lower region of the steel plate near the formwork base according to their subsequent axial position. Supplementary so-called auxiliary strands in the upper part of the steel plates are required. These hold the balance of forces around the axis of the pressure tube. These strands can be used over and over again, so can be used for monolayers in the PE jacket become. Its associated anchoring is permanent and always remains fixed to the steel plate.

The two steel plates and the pressure tube with the interposed Cylinders form a stable unit that move as a whole, settle on the formwork and can also lift off. Pipe, cylinder and steel plates are bolted together. In addition, the upper auxiliary strands always remain fixed to the unit. This applies both in the tense as well in the relaxed state.

The to be glued strands are fixed in position on the steel plates, aligned and slightly tense. By applying the cylinder All strands (bottom + top) are stretched evenly. The cylinder is after tightening with a collar in the extended position fixed. The unit with the stretched strands can as a whole Construction deposited on the formwork and aligned in this become. The lower strands then come within the cross section later Component to lie. After concreting the component they are Strands embedded in concrete. With the draining of the cylinder all become Strands of the unit relaxed. The tension of the lower strands goes over to the vorzuspannende component through composite. In order to the component is pretensioned with the strands. By removing the anchor sleeves on the steel plates, the entire clamping unit of the formwork removed and for the next Be prepared for use.

little one mobile clamping units consist of a cast-out steel tube ∅133 mm and the slightly larger units use two parallel concreted steel pipes with a preferred ∅133 mm.

These mobile tensioning units have due to the parallel arrangement of strand bundles in lower and upper layer has the advantage that the strand bundles be redirected almost anywhere by a spread can. With spacers, the parallel bundles of strands become discrete shifted their parallel axis, and thus deflected accordingly. This creates a deflected Spannlitzenverlauf, which then as such is also implemented in the component. The mobile bed associated Litz wires are therefore also capable of not only straight-line geometries take. Thus, z. B. a carrier according to its moment course trapezoidal be biased so as to make optimum use of the tension reinforcement, and the carrier optimally bias.

The guide the strand bundle in the defined distance to the central pressure tube has in the tensioned State the big one Advantage that the pressure tube can never buckle, as the off-center arranged tension strands as a corrective with the spacer elements stabilize the pressure tube. This allows the pressure pipe to the absolute Minimum in dimensions (only for transmission of compressive stresses from the prestressed strands) are designed.

ever according to the width of the component to be prestressed are several mobile clamping units prepare accordingly and next to each other on the Schaltisch to position. It can also alternate units with each other, so that just tendons with curved alternate. Thus, can be then optimally bias a ribbed plate, wherein in the Rip a curved tendon course and in the attached Plates a straight tendon guide can be realized.

A mobile clamping unit for tensioning 6 strands (Ap = 100 mm2) weighs total with cylinder and steel plates about 1.1 to. For a plate with a width of 2.70 m, about 30 strands are needed. Thus, about five mobile To arrange clamping units next to each other with a total additional weight from 5.5 to. If less strands are needed, they do not need to be that way either many mobile clamping units to be used.

The costs for A mobile clamping unit with the cylinder amounts to approx. EUR 6,000.00. Compared to a possible Tensioning frames placed on the revolving table at a cost of approx. 100'000,00 EUR are then 30'000,00 EUR for five mobile The tenter frame equivalent units very economical. moreover The mobile clamping units are characterized by their lower weight and the greater flexibility in the Application off.

Of the Subject of the present invention does not arise only from the subject matter of the individual claims, but also from the combination the individual claims among themselves.

All in the documents, including Summary of information and features, in particular the spatial training shown in the drawings as claimed essential to the invention, as far as they individually or in Combination opposite the prior art are new.

in the Below, the invention is based on several execution paths illustrative drawings closer explained. Here are more from the drawings and their description Essential to the invention features and advantages of the invention.

It demonstrate:

1 : Top view of a mobile fitted bed in a first embodiment with the support on a circulation pallet

2 : Cut through the arrangement after 1

3 : the arrangement after 1 and 2 in a perspective side view from the left

4 : the same representation in the perspective view from the right

5 : one opposite 3 and 4 extended embodiment of a mobile fitted bed

6 : the top view of the arrangement after 5

7 : A detailed representation of an end face of the arrangement according to 6

8th A second embodiment of a mobile tensioning bed with interspaced expansion elements

9 : the perspective view on the representation after 8th

10 : the enlarged side view of the arrangement 8th and 9

11 : A top view of the combination of different mobile fitted beds

12 : the side view of the mobile fitted bed, which is in 11 is used

13 The side view of the second embodiment of a mobile clamping bed, which also in 11 is used.

In the 1 and 2 is a circulation pallet 2 shown, consisting essentially of roles 3 exists on which a stiffening carrier 11 is arranged, in turn, a steel plate 12 wearing.

The steel plate 12 is the table on which the hardenable concrete mass is applied, and in the later drawings it is always assumed that the concrete mass becomes a concrete element 5 is processed, which is under tensile force reinforcing elements 10 is interspersed.

This is a prestressed concrete element 5 created, with the reinforcing elements 10 may preferably be formed as steel strands, wires or rods. The type of reinforcing elements can also be mixed. This means that different types of reinforcing elements (strands, wires and rods) can be used together or in combination with each other.

The reinforcement elements 10 are left and right sides in associated abutment plates 7 . 8th taken, which are preferably designed as steel plates.

It is important that the reinforcement elements subject to tensile force 10 opposite tension elements 9 are arranged, in size and number preferably the reinforcing elements 10 correspond.

hereupon However, the invention is not limited.

If, for example, a number of 5 reinforcement elements 10 can be provided from steel strands can in the upper level (in the plane of the tension elements 9 ) may be arranged a smaller number of tension members, or these tension members may also consist of other materials. For example, if the reinforcing elements 10 are formed of steel strands, the oppositely arranged tension elements 9 consist of steel bars, wires or the like or as well as steel strands. The invention thus provides all possible embodiments, wherein it is important that on the upper tension elements 9 the same tensile forces (in total) are transmitted as over the lower reinforcement elements 10 ,

This leads to exactly centric tensile forces on the two opposing abutment plates 7 . 8th be initiated, and it is important that between the abutment plates 7 . 8th Centric in each case a number of abutment profiles 6 are arranged.

Such a centric arrangement is preferred to ensure that the abutment plates 7 . 8th just under the same bias up and down and the abutment profiles 6 then centered on the abutment plates 7 . 8th attack, so as to achieve a balanced state of force.

hereupon However, the invention is not limited.

In another embodiment, it may be provided that the end faces of the respective abutment profiles decentralized to the abutment plates 7 . 8th set and that this resulting tilting moment is compensated for the abutment plates by appropriate tension setting on the upper tension elements.

This means that it does not require solution is that the tensile force on the upper tension elements is the same as the tensile force on the lower reinforcement elements. So that depends also on the nature and arrangement of the interposed abutment profiles from.

Of the For the sake of simplicity, however, in the following description of assumed a central arrangement of the abutment profiles to the abutment plates, and it is further assumed that the traction on the upper tension elements is the same as the tensile force on the lower reinforcement elements, which are embedded in the concrete part of the tensile force. This is on However, the invention - as above standing described - not limited.

In a preferred embodiment of the present invention, the tensile force on the upper tension members and also on the lower reinforcing elements 10 through a tensioning device 4 applied, which consists in the preferred embodiment of a piston-cylinder assembly. Further details of this piston-cylinder arrangement are for example 7 refer to. There it can be seen that the piston-cylinder arrangement between two pressure plates 16 . 17 is arranged, for example, the piston 14 on the left pressure plate 16 on the abutment plate 8th pushes while the cylinder housing 15 on an associated printing plate 17 at the front of the abutment profile 6 pressed.

In the embodiments, the abutment profile 6 preferably designed as a tubular profile. In order to transmit corresponding compressive forces, it is preferred if this tube profile is filled with a concrete or other load-transmitting mass.

The However, the invention is not limited to the formation of a tubular profile. It can all known Profiles are used, such as. B. extruded profiles or oval or rectangular or square profiles.

It is only important that this abutment profile 6 is able to absorb the relatively high compressive forces and between the abutment plates 7 . 8th to distribute.

In the 3 and 4 is in each case a spatial representation of the arrangement according to the 1 and 2 omitting the circulation pallet 2 shown.

It can be seen that a number of tension elements 9 , which are formed in the embodiment shown as steel strands, a similar number of reinforcing elements 10 opposite, which are also designed as steel strands and under tensile force the concrete element 5 push through.

The 5 shows a larger mobile fitted bed according to the invention, where it can be seen that a number of abutment profiles 6 with associated clamping devices 4 can be used, with the abutment profiles 6a . 6b occupy a mutual distance from each other and each in the space between the upper tension elements 9 and the lower reinforcement elements 10 are arranged.

The 6 shows the same arrangement as 5 in the plan view, from which further details.

The 7 shows the enlarged end view of the arrangement according to the 3 and 4 , and this figure has already been described above. From this representation it can be seen that on the upper tension elements 9 a tensile force 18 acts, which is exactly the same as the tensile force 19 pointing to the lower reinforcement elements 10 acts.

The two pulling forces 18 . 19 be over the pressure force 20 compensated over the longitudinal cross section of the abutment profiles 6 acts.

It has already been pointed out above in the general description part, that in the embodiment shown, although the tensile forces 19 are the same and the opposite an equal pressure force 20 counteracts. However, the invention is not limited thereto. Same tensile forces with the same opposite compressive force will only arise if the abutment profile 6 exactly centered on the respective abutment plate 7 . 8th pressed.

Does it come to a decentralized attack of the abutment profile 6 can have different tensile forces 18 . 19 arise. It is important, however, that the abutment plates 7 . 8th are always biased evenly to avoid kinking or tilting. This leads to the desired success of the invention that you can transmit high forces namely with relatively small components and also achieved instead of a fixed clamping frame now a mobile fitted bed.

The 8th to 10 show as a further embodiment that it is not necessary, the tension elements 9 and the reinforcing elements 10 parallel under traction. There is shown that between the elements 9 . 10 spreading 13 are arranged perpendicular to the longitudinal extent of the elements 9 . 10 are arranged. This allows the reinforcing elements 10 the bending moment ver run in the concrete element 5 be adapted, which was not possible before.

This makes it possible to build smaller concrete elements 5 to accomplish.

The 10 shows as a further modification that it eliminates the jig 4 is possible, one from the outside to the respective abutment plate 7 . 8th attaching pulling device to be used in the direction of arrow 21 a train on both the tension elements 9 as well as on the reinforcement elements 10 exercises.

This can be z. B. be provided that a pulling device not shown directly to the abutment plate 7 or 8th attacks and this centric in the direction of the longitudinal extent of the abutment profiles 6 in the direction of the arrow 21 draws.

With the embodiment of 8th to 10 So it's going to be a different kind of mobile bed 22 created because with the illustrated elements 9 . 10 also an arcuate course in the concrete element to be made 5 is reached.

The 11 and 12 now show the combination of mobile beds 1 . 22 , which are adjacent to each other in a modular manner and are arranged in parallel on the surface of a circulating pallet, not shown. 11 shows here that in each case a just trained mobile fitted bed 1 with a polygonal trained bed 22 is alternated and that a total of three straight trained Spannbetten alternately with two polygonal trained Spannbetten 22 together on the surface of a circulation pallet 2 are arranged.

This results in the advantage that you can now make it first cranked beams, ribbed plates or the like, because the reinforcing elements 10 in the straight mobile fitted bed 1 are led differently than the reinforcing elements 10 in the polygonal fitted beds 22 so that you can use differently shaped beams or plates or ribbed plates with an arrangement according to 11 can make.

The 12 and 13 show only schematically in the side view of a mobile fitted bed 1 according to the embodiments described above 1 to 4 and also the polygonal fitted bed 22 according to the embodiments according to 8th to 10 ,

1

fitted (mobile)

2

circulating pallet

3

roll

4

jig a, b

5

concrete element

6

Abutment profile 6a . 6b

7

Abutment plate

8th

Abutment plate

9

tension element

10

reinforcing element

11

stiffening girder

12

steel plate

13

spreader

14

piston

15

cylinder housing

16

printing plate

17

printing plate

18

traction

19

traction

20

thrust

21

arrow

22

fitted (mobile)

Claims (16)

A prestressed bed for the production of pre-stressed concrete precast elements, in the cross-section of which a number of prestressed reinforcing strands are accommodated, which is arranged on a switch table, characterized in that the fitted bed ( 1 ) irrespective of its attachment to the switch table or a circulation pallet ( 2 ) is inherently stable and easy to transport. Fitted bed according to claim 1, characterized in that the fitted bed ( 1 ) of two opposing abutment plates ( 7 . 8th ) between which one or more abutment profiles ( 6 . 6a . 6b ) are arranged, which by means of a tensioning device ( 4 . 4a . 4b ) the two abutment plates ( 7 . 8th ) press against each other. Fitted bed according to claim 1 or 2, characterized in that in the lower part of each abutment plate ( 7 . 8th ) one or more reinforcement elements ( 10 ) are arranged, which opposite to the respective abutment plate ( 7 . 8th ) each tension elements ( 9 ) assigned. Fitted bed according to at least one of the preceding claims, characterized in that the reinforcing elements ( 10 ) optionally consist of strands or wires or rods or a combination of these elements. Fitted bed according to at least one of the preceding claims, characterized in that the tension elements ( 9 ) consist of strands or wires or rods or a combination of these elements. Fitted bed according to at least one of the preceding claims, characterized in that the abutment plates ( 7 . 8th ) with the intermediate abutment profiles ( 6 . 6a . 6b ) are statically balanced. Fitted bed according to at least one of the preceding claims, characterized in that the underlying reinforcement elements ( 10 ) upper tension elements ( 9 ), which with the abutment plates ( 7 . 8th ) and which take up the same train as comparatively the lower reinforcing elements ( 10 ). Fitted bed according to at least one of the preceding claims, characterized in that at a front, free end of an abutment profile ( 6 . 6a . 6b ) a tensioning device ( 4 . 4a . 4b ) is arranged, which with the one side on the front side of the abutment profile ( 6 . 6a . 6b ) and with the other end face on the abutment plate ( 7 . 8th ) presses. Fitted bed according to at least one of the preceding claims, characterized in that the tensioning device ( 4 . 4a . 4b ) is designed as a piston hydraulic cylinder device. Fitted bed according to at least one of the preceding claims, characterized in that a pulling device from the outside to the abutment plate ( 7 . 8th ) attacks and the abutment plate of the abutment profile ( 6 . 6a . 6b ) moves away. Fitted bed according to at least one of the preceding claims, characterized in that the respective table near the top of the circulation pallet ( 2 ) arranged reinforcing elements ( 10 ), which are cast in the precast concrete part, opposite to the respective abutment plate ( 7 . 8th ) a tension element ( 9 ), which transmits the same tensile forces as the reinforcing elements ( 10 ) in the concrete ( 5 ) are poured. Fitted bed according to at least one of the preceding claims, characterized in that the tensile forces on the upper tension elements ( 9 ) and the lower reinforcement elements ( 10 ) and that the pressure forces are transmitted via the intermediate abutment profiles ( 6 . 6a . 6b ) be transmitted. Fitted bed according to at least one of the preceding claims, characterized in that a plurality of fitted beds ( 1 . 22 ) lying side by side in a modular manner on a switch table or a circulation pallet ( 2 ) are arranged. Fitted bed according to at least one of the preceding claims, characterized in that it consists of the following components: - two steel plates ( 12 ) as an abutment at each end of the unit - a pressure tube between the two steel plates ( 12 ) - a hydraulic cylinder ( 14 . 15 ) in the axis of the pressure tube attached to one of the steel plates Fitted bed according to claim 14, characterized in that the steel plates ( 12 ) form the abutment yoke for receiving the strands with their anchors and that the openings for the layered mounting of the permanent and temporary anchor boxes are mounted therein, wherein the steel plates ( 12 ) on the formwork floor and thus determine the altitude of the exciting strands. Fitted bed according to claim 15, characterized in that between the tension and reinforcement elements ( 9 . 10 ) Spreading elements ( 13 ) are arranged perpendicular to the longitudinal extent of the tensile and reinforcing elements ( 9 . 10 ) are arranged.