FI126477B

FI126477B - wire Control System

Info

Publication number: FI126477B
Application number: FI20135042A
Authority: FI
Inventors: Sven Wallgren; Jukka Ahonen; Aki Nieminen
Original assignee: Concore Bv
Priority date: 2013-01-14
Filing date: 2013-01-14
Publication date: 2016-12-30
Also published as: WO2014108535A1; FI20135042A

Description

Strand guide system Technical Field

The present invention concerns a strand guide for placing longitudinal pre-stressing strands on a concrete product that is manufactured by an extruder, slipformer or other type of horizontal casting method.

Especially the invention concerns a method and extruder for placing the strands in an extruded concrete product during casting.

Background

In the building industry, large numbers of various concrete products, which are prefabricated in factories, are used. Examples of such products are slabs, columns, and prefabricated units. Known methods for casting elongated concrete products are the extrusion technique and the slipformer technique. These methods have been in general use since about the end of the 1960s. They are typically used to manufacture floor units and simple beam profiles.

In the extrusion technique, concrete is fed to an elongated form base with the aid of screws through nozzles and forming elements. The axes of the screws are parallel to the casting base and thus also to the cast, and comprise shaping elements, with the aid of which cavities, for example, can be formed in the unit. The shaping elements are usually extensions of the screws. Most typically, the products are hollow-core slabs, which in practice have become typically standardized as 1200 mm wide and 150 mm - 500 mm thick or even thicker. Widths of 600, 100, 1500 or 1800 are also commonly used. The compaction of the concrete takes place mainly with the aid of the feed pressure of the screws and vibration, or the feed pressure of the screws and mechanical compaction movements i.e. shear compaction. In the method, it is typically possible to use dry concrete and in it a good concrete compaction and strength are generally achieved. Thanks to the dry mass, the cast product remains highly cohesive immediately after casting, which is a precondition for the manufacture of hollow-core products.

The screw's function in the extruder is to transport the concrete mass into the space delimited by the shaping elements and at the same time to create a pressure, which will be a central factor in promoting and controlling the compaction gradient. The screw also participates in compaction in connection with shear compaction. As the screw moves typically backwards and forwards along with the core, its shape creates an oriented compaction in the space between two screws and between the screw and the other delimiting nozzle components. For reasons of balance, the adjacent screws move in opposite directions and a float is created, in which the mass under increasing pressure is floated and consolidates due to the compaction movement. The elementary units of the mass seek an increasingly compact space.

When the concrete products, for example hollow core slabs, are used as a horizontal load bearing element, the product is pre-stressed by tensioning cables or solid steel strands inside the cast product. The strands are placed in the lower part of the profile under the horizontal centerline and often also in the upper part of the profile over the centerline. The strands are tensioned to a preset load during the casting and the tension is released when the cast has set. When the cast is set and the tension released, the cast is placed under a tension by the strands. Pretensioning increases significantly load bearing capacity of the product. Principles of designing, dimensioning and manufacturing pre-tensioned concrete products are well known in the art.

The strands have to be guided to correct positions in the cast product during manufacturing. Presently the guiding is done by using a separate carriage that is in front of the extruder and inserts the strands via strand guide elements in the product. The carriage has guide hooks that operate like scissors so that when the scissor elements are closed, the strands are grabbed by the opposite hooks in the scissor elements. One problem related to these guide hooks is flexibility of the scissors or hooks during guiding. The flexibility is caused mainly by jointed attachment of the scissors. The strand guide carriage is usually placed in front of the extruder so that they are far away from the casting and forming area of the extruder. This placement guarantees that the guides are not damaged by the flowing concrete mass of vibrations of the machine, but the distance from the cast is great, whereby the strands are easily displaced by flowing concrete mass and movements of the machine. The flexibility of the strand guides and poor guiding effect makes it difficult to position the strands securely and accurately to their optimum position. As the correct positioning of the strands is essential for the strength of the product, the possible deviations have to be taken into account in dimensioning the product for loads. This may lead to increasing dimensions of the product and/or need to use more or heavier pre-tensioning strands.

Same problems apply to slipformer process and other horizontal continuous casting methods. However, as the vigorous agitation of the concrete mix by the extruder screws is not present, placing and guiding the strands during manufacture is less problematic when these manufacturing methods are used.

Documents EP 1332851 B1 and DE 1036743 B disclose strand guides for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus.

Document JP 2002088976 A discloses a fixture for supporting a sheath which is placed in a concrete structure. The fixture comprises a sheath holder arm and a pair of locking hooks for attaching the fixture to a reinforcing bar of the concrete structure.

Summary of Invention

The purpose of the invention is to provide more effective and accurate way to guide the pre-tensioning strands in an extruder, slipformer or other continuous horizontal casting method during casting.

Especially the purpose of the invention is to provide more effective way to guide the pre-tensioning strands in an extruder. A further purpose of the invention is to provide a modular extruder with an optional strand guide. A purpose of one particular embodiment of the invention is to provide a strand guide wherein flexibility is minimized. A purpose of one embodiment of the invention is to provide a strand guide and extruder wherein the distance of the guiding point from the forming area is short. A purpose of one embodiment of the invention is to provide a strand guide that is mechanically simple and reliable.

The invention is based on providing at least two elongated hook arms that each comprise at least one hook for grapping a strand and mounting the hook arms in a fixed position in relation to each other so that at least two of the hooks point towards each other and at least two of the hook arms are distanced from each other in direction perpendicular to the direction the hooks are facing. The at least two hook arms are fixedly mounted on a rod that can be rotated around an axis parallel to the longitudinal axis of the hook arms.

According to one embodiment, the rods with hook arms are mounted rotatably on a frame.

According to one embodiment, the frame is mounted on an extruder to a prefabricated mounting position that has been reserved for mounting a strand guide.

According to one embodiment of the invention, the mounting position for the frame on the extruder is at the beginning of at least one extruder screw.

According to one embodiment of the invention, the mounting position for the frame on the extruder is at the beginning of at least one extruder screw between the concrete hopper and the drive mechanism for the extruder screws.

According to one embodiment of the invention, the rods are connected to a linkage that can be used for rotating the rods simultaneously.

According to one embodiment of the invention, the rods are round bars having two parallel flat surfaces at one end for mounting the hook arms.

According to one embodiment of the invention, the hook arms are flat plate elements having the hooks cut in their edges.

The strand guide according to the invention is characterized by what is stated in the characterizing part of claim 1.

The method according to the invention is characterized by what is stated in the characterizing part of claim 7.

The extruder according to the invention is characterized by what is stated in the characterizing part of claim 10.

Various embodiments of the invention provide several benefits .

The strand guide system according to the invention ensures very stable strand location despite of vigorous movements of the concrete mass around the strands. The agitation of the mass is caused by the auger screws feeding the mass. As the screws may have different rotational speeds and even directions and the properties of the concrete mass vary, the forces directed to the strands vary and keeping the strands on proper places is difficult. By the strand guide according to the invention it is possible to place the strands accurately in the product. This enables accurate dimensioning the intercore webs and using high tension on the strands. Thus, being able to accurately place the strand improves the quality of the product and is definitely a commercial benefit. The location of the system module is preferably straight behind the concrete hopper and screw; by this means the efficiency is the best against the deviating forces of the rotating and pumping screws. The hook arms have been designed rigid to ensure accuracy. One monolith with two rigid arms can be conveniently dimensioned more rigid than two separate arms.

The strand guide according to the invention may be submitted as packet or module that can be optionally purchased with the extruder when needed. The extruder includes a prefabricated mounting place on which the strand guide can be mounted when it is needed. The strand guide may be operated entirely by hand. In such a case mounting of the apparatus is quite simple as only bolting the apparatus on the extruder is needed. Of course the strand guide can be operated electrically, pneumatically or hydraulically if so desired. In that case connection to suitable power source and control mean is needed.

The hook arms can be easily changed or replaced. They are preferably made of metal plate by cutting, whereby the costs of manufacturing the arms can be kept in minimum. This enables efficient use of different designs of arm for varying the strand placement as well as low maintenance costs .

Other objects and features of the invention will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It is to be understood, however, that the drawings are intended solely for purposes of illustration and not as a definition of the limits of the invention, for which reference should be made to the appended claims.

Description of Drawings

Fig. 1 shows a simplified side view of an extruder according to the invention.

Fig. 2 depicts a strand guide according to the invention.

Fig. 3 shows one embodiment of guide arms for a strand guide.

Fig. 4 shows an alternative embodiment of a guide arm for a strand guide.

Description of embodiments

The invention is explained as applied to an extruder. It can be applied in similar manner to a slipformer of other kind of a continuous horizontal casting machine or method.

An extruder comprises a frame 1 that is arranged to travel on a forming platform 3 on wheels 2. The product that is manufactured is shaped by pushing concrete mix through a limited cross section that gives the product its outer shape and forms the cavities called cores in the cross section of the product. The limited cross section is formed by the top surface of the forming platform 3, side walls of the extruder (not numbered) and the wear plate 8 of a top sealing unit 7. Between the top sealing unit 7 and the forming platform 3 and penetrating through the limited cross section are core forming sleeves 6. The core forming sleeves 6 are attached at the end of feed screws 5. The feed screws are connected to a drive mechanism 9 that rotates the screws 5 and provides compacting movement for the screws and the core forming mandrels. A concrete hopper 4 is placed at the opposite end of the feed screws 5 in view of core forming mandrels and over the screws.

During the manufacture concrete mix is poured in the hopper 4 (only lower part of which is shown) and the rotating screws push the mix to the limited cross section around the core forming mandrels. The reaction for of the pushing of concrete mix moves the extruder away from the formed product and an elongated hollow core slab or other extruded product is formed.

The features and operation of an extruder described above are common to most of the modern extruders. The setup of each machine may vary, but these variations don't prevent utilizing the invention.

The invention relates to guiding pre-stressing strands in an extruder that is generally of the type described above.

An important feature of on embodiment of the invention is the placement of the strand guide. As all clients may not wish to have a strand guide apparatus or wish to handle positioning of the strands in a different manner, all extruders are not equipped with a strand guide when delivered. However, each extruder comprises a preliminarily prepared mounting position for a strand guide. This enables modular design of the extruder. When an extruder with a strand guide is ordered, the strand guide can be simply assembled on an extruder frame without changing the design or dimensions of the extruder in any way. Basically this mounting position may be at any convenient place on the machine, for example in front of the machine or behind the machine in its travel direction. However, an advantageous placement of the strand guide is shown in figure 1. In this embodiment the strand guide 10 is placed between the concrete hopper 4 and drive mechanism 9 of the feed screws 5. This arrangement places the strand guide 10 and the hook arms 11 at the start end of the feed screws 5. The distance of the holding point of the hook arms 11 and the feeding zone of the feed screws is kept in minimum. This gives essential benefits as the feeding and mixing action of the feed screws 5 before the forming zone, or the limited cross section, is vigorous and the forces directed to the strands are high and may easily cause displacement of the strands. The span over which the strands travel unguided is kept short, whereby the free movement of the strands is effectively limited. It is clear that displacements over a shorter distance are smaller than over a span of longer free travel. In this embodiment the free travel is limited to distance between hook arms 11 and the end of the feed screws 5. At the end of the feed screws 5 the concrete start to take form and settle. At this point no, or very little, displacing forces occur and the strands also settle within the product.

One embodiment of a strand guide 10 is shown in figure 2.

The strand guide 10 comprises a frame 12, that is designed to be mounted on the preliminarily prepared mounting position of the extruder, preferably on position shown in figure 1. The mounting of the strand guide 10 to the extruder can be done by mounting lugs 28 attached to the frame 12. The vertical position of the hook arms 11 and the vertical placement of the hooks 13 of the arms 11 are set by using mounting blocks of desired height or mounting fixtures set on various heights, for example. On the frame is attached a cam mechanism 14 that comprises two cams 15 turnably linked to the strand guide frame 12 at the both ends of the frame 12. The cams 15 are connected by a connection bar 16. When the connection bar 16 is lifted or lowered, the cams 15 are turned. The cams 15 are set to move on a counter surface on the extruder frame 1 so that when the cams 15 are turned, the position of the strand guide frame 12 and the hooks 13 of the hook arms in relation to the extruder frame 1 changes. This system is provided for fine setting of the hooks 13 of the hook arms 11 so that the strands are guided on a proper place in the concrete product.

The hook arms 11 are attached rotatably on the strand guide frame 12 by rods 17 that have a circular cross section. The circular cross section is easy to mount on the frame rotatably and provides an easy way to attach the hook arms 11 to the rods. Namely, the hook arms 11 may be manufactured by cutting from a steel plate for example by laser. Then the sides of the hook arms are flat. Corresponding flat surfaces can be easily machined on the ends of the rods 17 and the hook arms may be attached to the rods 17 simply by bolts.

The construction is simple and changing and replacing of the hooks arms 11 is simple and fast. Of course, any other construction, like, for example a hexagonal male-female connection, may be used if it is so desired. As can be seen from the figure 2, the strand guide 10 comprises three central hook assemblies 19 and two side guides 20. The side guides comprise only one hook pointing away from the centerline of the apparatus. The central hook assemblies 19 comprise five guide positions for strands. The configuration and number of guide positions on sides and central assemblies are determined by the strand configuration of the product. This can be easily changed by changing the hook arms to correspond to the strand configuration in question.

One essential feature of the central hook assemblies 19 is the gap between the hook arms 11. The gap enables grapping of the strand and simultaneously mounting the hook arms 11 solidly to the rods. The minimum width of gap is same, preferably little larger that the diameter of a strand that is to be guided. As the strand diameter may vary, the gap should be dimensioned according to the largest diameter that is handled by a hook arm set.

The strand guide must be able to grab the strands when the strands are set to run over the forming platform and through the extruder. For this the hook arms are mounted on rotatable rods 17. Each of the rods 17 is connected to a linkage 21 that connects the top ends of the rods 17. One of the rods comprise a turning handle 22. Now, when the turning handle is moved, each of the rods 17 and hook arms 11 connected to them rotate accordingly. In the figure 2 the hook arms 11 are shown in a guiding position. In this position the strands are held by the hooks 13 of the hook arms 11. When the turning handle 22 is operated, the hook arms 11 and the rods 17 can be turned 90° so that the gap between the two hook arms 11 mounted on a same rod 17 is parallel to the longitudinal axis of the extruder. Now the strands can be set to run longitudinally over the forming platform 3 and between the hook arms 11 according to the plan how the strands are designed to be placed within the product. When each strand that is needed is set between the hook arms on a designed place, the hook arms are turned again 90°. Now the hooks 13 and the gap between the hook arms 11 turn crosswise to the longitudinal axis of the extruder and grab the strands on the hooks. As can be seen from the figure 2, the hooks 13 and guide surfaces 23 of them are aligned so that the strands are guided and grabbed by two successive hooks 13 that support the strand on opposite sides. This guarantees positive locking of the strands on the hooks 13.

One embodiment of hook arms ids shown in figure 3, that shows two similar hook arms 11 positioned opposite to each other. The arm 11 comprises a body part 24, which may be cut from a metal plate by a suitable cutting method, for example by laser. The body part 24 comprises in this embodiment mounting holes 27 for attaching the hooks to a rod 17 and three superposed upper guide hooks 25 that are formed of an angled lead surface 26 that slopes downwards in the body part 24 in relation to the end with the mounting holes 27. The upper end of the lead surface 26 ends to a circular recess that forms a seat for a strand guide and operates as a guide surface 23 that keeps the strand in place during casting. In this embodiment the upper guide hooks 25 are all similar. The end opposite to the mounting holes of the hook arms 11 is made of two plate elements. The fist plate element 30 is attached to the surface of the hook arm 11 that faces away from the gap of the hook arms 11. This first plate element 30 comprises two guide surfaces for the strands. The second plate element 31 is attached to the outer surface of the first plate element 30 and comprises and edge that is comparatible to the guide and lead surfaces of the first plate element 30. The second plate element further comprises three guide surfaces 23 for the strands and lead and inclined surfaces. Thus, the lower hooks 29 comprise five guide surfaces. As the hook arms are positioned to face oppositely each other, a strand that is placed on a guide surface deeper in the hook of one arm is placed in outer position in the opposite hook. This enables easy grabbing of the strands and reliable hold of the hooks on the strands. The purpose of using the superposed plate elements is to widen the gap between the opposing hooks so that the grip on the strands is wider. The same effect can be achieved by widening the gap between the hook arms at the attaching point on the bars 17. In that case hook arms can be simple one piece parts

Figure 4 shows a hook arm that comprises only one plate element attached to a body part. This embodiment comprises three guide surfaces 23. As each type of hollow core slab or other concrete product comprising pretensioned strands requires individually designed strand lay-out, the hook arms must be adapted to handle the strand patterns needed for producing all the product types the manufacturer intends to provide. As the hooks arms can be made easily by cutting from a metal plate and they can be mounted and changed simply by using few bolts, the strand guide can be easily adapted to large variety of products.

For example, because of fire resistance demands variations the upper strand is kept as it is normally located, but the bottom strands are lifted some mm/cm higher. With various types of products the strands are located in very various positions in respect to the possible top strands and also locations of the groups of strands may vary. These all variations require easy adjustment (changes in the arm/hook).

Thus, while there have been shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the method and device may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same results are within the scope of the invention. Substitutions of the elements from one described embodiment to another are also fully intended and contemplated. It is also to be understood that the drawings are not necessarily drawn to scale but they are merely conceptual in nature. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.

Reference signs list 1. extruder frame 2. wheel 3. forming platform 4. concrete hopper 5. feed screw 6. core forming sleeve 7. top sealing unit 8. wear plate 9. drive mechanism 10. strand guide (unit) 11. hook arms 12. frame of the strand guide 13. hook 14. cam mechanism 15. cam 16. connection bar 17. rod 18. bolt 19. central hook assembly 20. side guide 21. linkage 22. turning handle 23. guide surface 24. body part 25. upper guide hooks 26. lead surface 27. mounting holes 28. mounting lugs 29. lower hooks 30. first plate element 31. second plate element

Claims

Claims Claim 1 A strand guide (10) for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus, comprising - a frame (12), and - means (11), mounted on the frame (12), for grapping at least one strand, comprising at least two elongated hook arms (11) that each comprise at least one hook (13) for grapping a strand, characterized in that - the hook arms (11) being mounted in a fixed position in relation to each other so that at least two of the hooks (13) point towards each other and at least two of the hook arms (11) are distanced from each other in direction perpendicular to the direction the hooks (13) are facing, and - the at least two hook arms (11) are fixedly mounted on a rod (17) that can be rotated around an axis parallel to the longitudinal axis of the hook arms (11).Claims Claim 1 A Strand Guide (10) for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus, comprising - a frame (12), and - means (11), mounted on a frame ( 12), for grapping at least one Strand, comprising at least two elongated hook arms (11) that each comprises at least one hook (13) for grapping a Strand, specifically in that - the hook arms (11) being mounted in a fixed position in relation to each other so that at least two of the hooks (13) are pointing towards each other and at least two of the hook arms (11) are distant from each other in the direction perpendicular to the direction of the hooks (13) are facing , and - at least two hook arms (11) are fixedly mounted on a rod (17) that can be rotated around an axis parallel to the longitudinal axis of the hook arms (11).

Claim 2 A strand guide (10) for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus according to the claim 1, characterized in that at least two of the hook arms (11) are distanced from each other and connected to each other by the rod (17) so that they can be operated simultaneously by means of the rod (17).Claim 2 A Strand Guide (10) for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus according to claim 1, at least two of the hook arms (11) are distanced from each other and connected to each other by the rod (17) so that they can be operated simultaneously by means of the rod (17).

Claim 3 A strand guide (10) for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus according to claim 2, characterized in that rods (17) with hook arms (11) are mounted rotatably on the frame (12) and the rods (17) are connected to a linkage (21) that can be used for rotating the rods (17) simultaneously.Claim 3 A Strand Guide (10) for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus according to claim 2, specifically in that rods (17) are mounted rotatably on the frame (12) and the rods (17) are connected to a linkage (21) that can be used for rotating the rods (17) simultaneously.

Claim 4 A strand guide (10) for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus according to one of the claims 1-3, characterized in that rods (17) are round bars having two parallel flat surfaces at one end for mounting the hook arms (11).Claim 4 A Strand Guide (10) for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus according to one of the claims 1-3, in which rods (17) are round bars parallel flat surfaces at one end for mounting the hook arms (11).

Claim 5 A strand guide (10) for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus according to one of the claims 1-4, characteri zed in that hook arms (11) are flat plate elements having the hooks (13, 25) cut in their edges .Claim 5 A Strand Guide (10) for placing longitudinal pre-stressing strands on a concrete product that is manufactured by continuous horizontal casting apparatus according to one of claims 1-4, characteri zed in that hook arms (11) are flat plate elements having the hooks (13, 25) cut in their edges.

Claim 6 A strand guide (10) for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus according to one of the claims 1-5, characteri zed in that the horizontal casting apparatus is an extruder.Claim 6 A Strand Guide (10) for placing a longitudinal pre-stressing strands on a concrete product that is manufactured by a continuous horizontal casting apparatus according to one of claims 1-5, characterized in that horizontal casting apparatus is an extruder.

Claim 7 A method for placing longitudinal pre-stressing strands on a concrete product that is manufactured by an extruder, which extruder comprises a strand guide (10) and a prefabricated mounting position on which the strand guide (10) is mounted, characterized by - setting, at least two elongated hook arms (11) that each comprise at least one hook (13) for grapping a strand, the hook arms (11) being mounted in a fixed position in relation to each other so that at least two of the hooks (13) point towards each other and at least two of the hook arms (11) are distanced from each other in direction perpendicular to the direction the hooks (13) are facing, in a first angular position, - placing at least one strand between the hook arms (11), and - rotating the hook arms (11) around an axis that is parallel to the longitudinal axis of the hook arms (11) in order to grab the strand.Claim 7 A method for placing longitudinal pre-stressing strands on a concrete product that is manufactured by an extruder comprising a Strand guide (10) and a prefabricated mounting position on which a Strand guide (10) is mounted, described by - setting, at least two elongated hook arms (11) that at least one hook (13) for grapping a Strand, hook hook (11) being mounted in a fixed position in relation to each other so that at least two of the hooks (13) pointing towards each other and at least two of the hook arms (11) being distanced from each other in the direction perpendicular to the direction of the hooks (13) being facing, in the first angular position, - placing at least one Strand between the hook arms (11), and - rotating the hook arms (11) around an axis that is parallel to the longitudinal axis of the hook arms (11) in order to grab the Strand.

Claim 8 A method for placing longitudinal pre-stressing strands on a concrete product that is manufactured by an extruder according to claim 7, characterized in that hook arms (11) are operated simultaneously by means of a rod (17) whereto the at least two of the hook arms (11) are connected.Claim 8 A method for placing longitudinal pre-stressing strands on a concrete product manufactured by an extruder according to claim 7, which are operated simultaneously by means of a rod (17) whereto at least two of the hook arms (11) are connected.

Claim 9 A method for placing longitudinal pre-stressing strands on a concrete product that is manufactured by an extruder according to claim 7 or 8, characterized in that the hook arms (11) are rotated 90° .Claim 9 A method for placing longitudinal pre-stressing strands on a concrete product that is manufactured by a claim 7 or 8, characterized in that the hook arms (11) are rotated 90 °.

Claim 10 An extruder for producing a concrete product, the extruder comprising - a frame (1), - a limited cross section for shaping the product (3, 6, 8), - feed screws (5) for pushing concrete mix through the limited cross section, - core forming sleeves (6) penetrating through the limited cross section and attached at the end of the feed screws (5), - a drive mechanism (9) for rotating the screws (5) and providing compacting movement for the screws (5) and the core forming sleeves (6), - a concrete hopper (4) placed at the opposite end of the feed screws (5) in view of the core forming sleeves (6) and over the screws (5), and - a strand guide (10), characterized by a prefabricated mounting position for mounting the strand guide (10), the strand guide comprising: - a frame (12), - means (11), mounted on the frame (12), for grapping at least one strand, comprising at least two elongated hook arms (11) that each comprise at least one hook (13) for grapping a strand, the hook arms (11) being mounted in a fixed position in relation to each other so that at least two of the hooks (13) point towards each other and at least two of the hook arms (11) are distanced from each other in direction perpendicular to the direction the hooks (13) are facing, and - the at least two hook arms (11) being fixedly mounted on a rod (17) that can be rotated around an axis parallel to the longitudinal axis of the hook arms (11), and in that the frame (12) of the strand guide (10) is mounted on the prefabricated mounting position.Claim 10 An extruder for producing a concrete product, the extruder comprising - a frame (1), - a limited cross section for shaping the product (3, 6, 8), - feed screws (5) for pushing a concrete mix through the limited cross section, - core forming sleeves (6) penetrating through the limited cross section and attached at the end of the feed screws (5), - a drive mechanism (9) for rotating the screws (5) and providing compacting movement for the screws (5) and the core forming sleeves (6), - a concrete hopper (4) placed at the opposite end of the feed screws (5) in a view of the core forming sleeves (6) and over the screws (5), and - a Strand guide (10), characterized by a prefabricated mounting position for mounting the Strand guide (10), the Strand guide comprising: - a frame (12), - means (11), mounted on the frame (12), grapping at least one Strand, comprising at least two elongated hook arms (11) that each forming at least one hook (13) for grapping a Strand, hook hook (11) b eing mounted in a fixed position in relation to each other so that at least two of the hooks (13) point towards each other and at least two of the hook arms (11) are distant from each other in the direction perpendicular to the direction of the hooks (13) are facing, and - at least two hook arms (11) being fixedly mounted on a rod (17) that can be rotated around an axis parallel to the longitudinal axis of the hook arms (11), and in that frame (12) of the Strand guide (10) is mounted on the prefabricated mounting position.

Claim 11 An extruder for producing a concrete product according to claim 10, characterized in that the mounting position for the frame (12) of the strand guide (10) on the extruder is at the beginning of at least one feed screw (5).Claim 11 An extruder for producing a concrete product according to claim 10, characterized in that the mounting position for the frame (12) of the Strand guide (10) is at the beginning of at least one feed screw (5).

Claim 12 An extruder for producing a concrete product according to the claim 10 or 11, characterized in that the mounting position for the frame (12) of the strand guide (10) on the extruder is at the beginning of at least one feed screw (5) between the concrete hopper (4) and the drive mechanism (9) for the feed screws (5).Claim 12 An extruder for producing a concrete product according to claim 10 or 11, characterized in that the mounting position for the frame (12) of the Strand guide (10) is the beginning of at least one feed screw ( 5) between the concrete hopper (4) and the drive mechanism (9) for the feed screws (5).

Patenttivaatimus 1 Vaijerin ohjain (10) pituussuuntaisten esijännitysvaijereiden sijoittamiseksi betonituotteeseen, joka valmistetaan jatkuvalla vaakavalulaitteel 1 a, joka käsittää - rangon (12)Ja - runkoon (12) kiinnitetyt elimet (11) otteen saamiseksi vähintään yhdestä vaijerista, jotka käsittävät vähintään kaksi pitkänomaista koukkuvartta (11), jotka kumpikin käsittävät vähintään yhden koukun (13) otteen saamiseksi vaijerista, tunnettu siitä, että koukkuvarret (11) on asennettu kiinteään asentoon suhteessa toisiinsa siten, että ainakin kaksi koukuista (13) osoittaa kohti toisiaan ja ainakin kaksi koukkuvarsista (11) sijaitsee etäisyyden päässä toisistaan suunnassa, joka on kohtisuorassa koukkujen (1.3) suuntaan nähden, ja ainakin kaksi koukkuvartta (11) on kiinteästi kiinnitetty tankoon (17), jota voidaan pyörittää koukkuvarsien (11) pituusakselin kanssa samansuuntaisen akselin ympäri. Patenttivaatimus 2 Patenttivaatimuksen 1 mukainen vaijerin ohjain (10) pituussuuntaisten esijännitysvaijereiden sijoittamiseksi betonituotteeseen, joka valmistetaan jatkuvalla vaakavalulaitteella, tunnettu siitä, että ainakin kaksi koukkuvarsista (11) sijaitsee etäisyyden päässä toisistaan ja ne on yhdistetty toisiinsa tangolla (17) siten, että niitä voi käyttää samanaikaisesti tangon (17) avulla. Patenttivaatimus 3 Patenttivaatimuksen 2 mukainen vaijerin ohjain (10) pituussuuntaisten esijännitysvaijereiden sijoittamiseksi betonituotteeseen, joka valmistetaan jatkuvalla vaakavalulaitteella, tunnettu siitä, että tangot (17), joissa on koukkuvarret (11), on kiinnitetty pyöritettävästi runkoon (12), ja tangot (17) on yhdistetty vivustoon (21), jota voidaan käyttää tankojen (17) pyörittämiseen samanaikaisesti. Patenttivaatimus 4 Jonkin patenttivaatimuksen 1-3 mukainen vaijerin ohjain (10) pituussuuntaisten esijännitysvaij ereiden sijoittamiseksi betonituotteeseen, joka valmistetaan jatkuvalla vaakavalulaitteella, tunnettu siitä, että tangot (17) ovat pyöreitä tankoja, joiden toisessa päässä on kaksi samansuuntaista pintaa koukkuvarsien (11) kiinnittämistä varten. Patenttivaatimus 5 Jonkin patenttivaatimuksen 1 - 4 mukainen vaijerin ohjain (10) pituussuuntaisten esij ännitysvaij ereiden sijoittamiseksi betonituotteeseen, joka valmistetaan j atkuvalla vaakavalulaitteella, tunnettu siitä, että koukkuvarret (11) ovat litteitä levyelementtejä, joiden reunoihin koukut (13, 25) on leikattu. Patenttivaatimus 6 Jonkin patenttivaatimuksen 1 -5 mukainen vaijerin ohjain (10) pituussuuntaisten esij ännitysvaij ereiden sijoittamiseksi betonituotteeseen, joka valmistetaan jatkuvalla vaakavalulaitteel 1 a, tunnettu siitä, että vaakavalulaite on ekstruuderi. Patenttivaatimus 7 Menetelmä pituussuuntaisten esijännitysvaijereiden sijoittamiseksi betonituotteeseen, joka valmistetaan ekstruuderilla, joka extruuderi käsittää vaijerin ohjaimen (10) ja esivalmistetun asennuspaikan, jossa vaijerin ohjain (10) asennetaan, tunnettu siitä, että - asetetaan vähintään kaksi pitkänomaista koukkuvartta (11), jotka kumpikin käsittävät vähintään yhden koukun (13) otteen saamiseksi vaijerista, jotka koukkuvarret (11) on asennettu kiinteään asentoon suhteessa toisiinsa siten, että vähintään kaksi koukuista (13) osoittaa kohti toisiaan ja vähintään kaksi koukkuvarsista (11) sijaitsee etäisyyden päässä toisistaan suunnassa, joka on kohtisuorassa koukkujen (13) suuntaan nähden, ensimmäisessä kulma-asennossa, - sijoitetaan vähintään yksi vaijeri koukkuvarsien (11) väliin, ja - pyöritetään koukkuvarsia (11) koukkuvarsien (11) pituusakselin kanssa samansuuntaisen akselin ympäri otteen saamiseksi vaijerista. Patenttivaatimus 8 Patenttivaatimuksen 7 mukainen menetelmä pituussuuntaisten esijännitysvaijereiden sijoittamiseksi betonituotteeseen, joka valmistetaan ekstruuderilla, tunnettu siitä, että koukkuvarsia (11) käytetään samanaikaisesti tangolla (17), johon vähintään kaksi koukkuvarsista (11) on yhdistetty. Patenttivaatimus 9 Patenttivaatimuksen 7 tai 8 mukainen menetelmä pituussuuntaisten esij ännity svaij ereiden sijoittamiseksi betonituotteeseen, joka valmistetaan ekstruuderilla, tunnettu siitä, että koukkuvarsia (11) pyöritetään 90°. Patenttivaatimus 10 Ekstruuderi betonituotteen tuottamiseksi, joka ekstruuderi käsittää - rungon (1), - rajoitetun poikkileikkauksen tuotteen (3, 6, 8) muotoilemiseksi, - syöttöruuvit (5) betoniseoksen työntämiseksi rajoitetun poikkileikkauksen läpi, - ytimen muodostavat holkit (6), jotka tunkeutuvat rajoitetun poikkileikkauksen läpi ja jotka on kiinnitetty syöttöruuvien (5) päähän, - käyttömekanismin (9) muvien (5) pyörittämiseksi ja tiivistävän liikkeen tuottamiseksi ruuveille (5) ja ytimen muodostaville holkeille (6), - betonisäiliön (4), joka on sijoitettu syöttöruuvien (5) vastakkaiseen päähän ytimen muodostaviin holkkeihin (6) nähden ja ruuvien (5) päälle, ja - vaijerin ohjaimen (10), tunnettu esivalmistetusta asennuspaikasta vaijerin ohjaimen (10) asentamista varten, joka vaijerin ohjain käsittää: - rungon (12), - runkoon (12) kiinnitetyt elimet (11) otteen saamiseksi vähintään yhdestä vaijerista, jotka käsittävät vähintään kaksi pitkänomaista koukkuvartta (11), jotka kumpikin käsittävät vähintään yhden koukun (13) otteen saamiseksi vaijerista, jotka koukkuvarret (11) on asennettu kiinteään asentoon suhteessa ainakin kaksi koukkuvarsista (11) sijaitsee etäisyyden päässä toisistaan suunnassa, joka on kohtisuorassa koukkujen (13) suuntaan nähden, ja - ainakin kaksi koukkuvartta (11) on kiinteästi kiinnitetty tankoon (1.7), jota voidaan pyörittää koukkuvarsien (11) pituusakselin kanssa samansuuntaisen akselin ympäri, ja siitä, että vaijerin ohjaimen (10) runko (12) on asennettu esivalmistettuun asennuspaikkaan. Patenttivaatimus 11 Patenttivaatimuksen 10 mukainen ekstruuderi betonituotteen tuottamiseksi, tunnettu siitä, että vaijerin ohjaimen (10) rungon (12) asennuspaikka ekstruuderissa on vähintään yhden syöttöruuvin (5) alussa. Patenttivaatimus 12 Patenttivaatimuksen 10 tai 11 mukainen ekstruuderi betonituotteen tuottamiseksi, tunnettu siitä, että vaijerin ohjaimen (10) rungon (12) asennuspaikka ekstruuderissa on vähintään yhden syöttöruuvin (5) alussa betonisäiliön (4) ja syöttöruuvien (5) käyttömekanismin (9) välissä.Claim 1 Cable guide (10) for inserting longitudinal prestressing wires in a concrete product made by a continuous horizontal casting device 1a, comprising: - a frame (12) and - members (11) fixed to the frame (12) to obtain a grip of at least one cable comprising at least two elongated hook arms 11), each comprising at least one hook (13) for receiving a grip from the wire, characterized in that the hook arms (11) are mounted in a fixed position relative to each other such that at least two hooks (13) point towards each other and at least two hook arms (11) spaced apart in a direction perpendicular to the direction of the hooks (1.3), and the at least two hook arms (11) are fixedly mounted on a rod (17) which can be rotated about an axis parallel to the longitudinal axis of the hook arms (11). Cable guide (10) according to claim 1 for positioning longitudinal prestressing wires in a concrete product made with a continuous horizontal casting device, characterized in that at least two of the hook arms (11) are spaced apart and connected to each other by a rod (17) by means of a rod (17). Cable guide (10) according to claim 2 for positioning longitudinal prestressing cables in a concrete product made with a continuous horizontal casting device, characterized in that the rods (17) having the hook arms (11) are pivotally attached to the frame (12) and the rods (17) are connected to a linkage (21) which can be used to simultaneously rotate the rods (17). Cable guide (10) for inserting longitudinal prestressing wires in a concrete product made with a continuous horizontal casting device according to one of Claims 1 to 3, characterized in that the rods (17) are round bars with two parallel surfaces for attaching the hook arms (11). A cable guide (10) according to any one of claims 1 to 4 for inserting longitudinal prestressing cables in a concrete product made with a continuous horizontal casting device, characterized in that the hook arms (11) are flat plate elements with hooks (13, 25) cut at their edges. Claim 6 Cable guide (10) according to one of claims 1 to 5 for inserting longitudinal prestressing wires in a concrete product made by a continuous horizontal casting device 1a, characterized in that the horizontal casting device is an extruder. A method for positioning longitudinal prestressing wires in a concrete product made by an extruder comprising a wire guide (10) and a prefabricated mounting location where the wire guide (10) is mounted, characterized in that - at least two elongated hook arms (11) are provided; for obtaining a single hook (13) from the wire, the hook arms (11) being mounted in a fixed position relative to each other such that at least two of the hooks (13) point towards each other and at least two hook arms (11) are spaced apart in a direction perpendicular to 13) with respect to the direction, in a first angular position, - positioning at least one wire between the hook arms (11), and - rotating the hook arms (11) about an axis parallel to the longitudinal axis of the hook arms (11). A method for positioning longitudinal prestressing wires according to claim 7 in a concrete product made with an extruder, characterized in that the hook arms (11) are simultaneously operated by a rod (17) to which at least two hook arms (11) are connected. Method according to claim 7 or 8 for positioning longitudinal prestressed cables in a concrete product made with an extruder, characterized in that the hook arms (11) are rotated 90 °. An extruder for producing a concrete product, the extruder comprising: - a frame (1), - a limited cross-section for shaping the product (3, 6, 8), - feed screws (5) for pushing the concrete mixture through a limited cross-section, - core-forming sleeves (6) through the cross-section and attached to the ends of the feed screws (5), - to rotate the drive mechanism (9) and to produce a sealing movement for the screws (5) and core forming sleeves (6), - a concrete tank (4) disposed in the feed screws (5) ) at the opposite end to the core-forming sleeves (6) and on the screws (5), and - a cable guide (10), characterized by a prefabricated mounting location for mounting the cable guide (10), comprising: - a frame (12), 12) fastened members (11) for extracting at least one wire comprising at least two lengths a particular hook arm (11) each comprising at least one hook (13) for receiving a grip from the wire, the hook arms (11) being mounted in a fixed position relative to at least two hook arms (11) spaced apart in a direction perpendicular to the hook direction (13); , and - at least two hook arms (11) are fixedly mounted on a rod (1.7) which can be rotated about an axis parallel to the longitudinal axis of the hook arms (11) and that the body (12) of the cable guide (10) is mounted in a prefabricated mounting position. The extruder for producing a concrete product according to claim 10, characterized in that the position of the body (12) of the wire guide (10) in the extruder is at the beginning of at least one feed screw (5). Extruder for producing a concrete product according to Claim 10 or 11, characterized in that the body (12) of the cable guide (10) is located at the beginning of the at least one feed screw (5) between the concrete container (4) and the drive mechanism (9).