TECHNICAL SPECIFICATION

Transcription

1 lifting anchor system The T-slot The T-slot lifting anchor system...1 Introduction...2 The T-slot anchor...3 The O-anchor...3 The P-anchor...3 The TKS rod-anchor...3 The TPA plate-anchor...3 The TKA tilting -anchor...3 The TSG bended T slot anchor...3 Characteristics...3 T slot anchor...3 P anchor...3 O anchor...3 The TKA tilting-anchor...3 TKS Anchor...3 The TH 2 lifting hook...3 Lifting under a angle...3 Checking measurements by reasons of wear to the lifting hook...3 Attachment of the lifting anchors in the concrete...3 The ball socket RB...3 The SRB-socket...3 Ball socket SB...3 RR ring...3 RBP socket...3 Calculation of the T slot anchor...3 Lifting in an angle...3 Dynamic forces...3 Directions for stick factors...3 Anchoring of T slot anchors...3 Calculation example Table Calculation example Table Calculation example Table Calculation example Table Threat analysis...3 A 1/32

2 Introduction For the transportation lifting and mounting of concrete elements the best choice is to use the T-slot lifting anchor system. This lifting system is the safest method to transport concrete elements through the air. The speed of the use and a cheap T-slot anchor make the application of this lifting system to the most economic system. The T-slot lifting anchor system exists out of a in the concrete poured T-slot anchor with a reusable rubber ball and a TH 2lifting hook which can be used for a long time. TH 2 lifting hook T-slot anchor Reusable rubber recess former A 2/32

3 The T-slot anchor is built in the concrete element with the aid of the rubber ball. After the poring of the shuttering and the concrete is hardened, the rubber ball can be removed. In this formed hole the TH 2lifting hook fits exactly and the pre-fab element can be hoisted out of the shuttering The T-slot anchor The T-slot anchor is a metal bar from which the aft ends are formed by means of hot forging are thickened to a head and a foot. On the head the indication T with the maximum adjustable towing force is applied. The foot is specially designed to realize a good anchoring force in the concrete. To the head of the anchor the lifting hook is fitted during use. During the pouring of the concrete a reusable rubber ball is mounted to the head of the anchor, so that a bowl formed hole in the concrete remains. The anchor is produced according to a quality system and each charge is controlled en tested by an authorized institute. The tests have proved that there is only a crack after an at least 3 times higher force than the admissible force of the anchor. A 3/32

4 At collapsing of the concrete a dish formed foot arises of the T-slot anchor a break out cone with a incline of 1:3. This is an angle of about 35 º in relation to the length axle of the T-slot anchor. For the calculation of the anchor force a safety factor of 2.5 is set. Also see the tables in this leaflet. If a calculation of the anchor force does not offer enough security placement of an additional armament brings a higher admissible value. The already present armament usually does not give increasing of the anchor force For lifting anchors different types in the T-slot lifting anchor system can be used. Each type lifting anchor has his own field of use and is developed on a base of similar dimensions, for which always the TH 2 lifting hook can be used The O-anchor The O-anchor is provided with a hole, in which a armament hairpin can be placed to obtain a good anchoring in small elements The P-anchor The P-anchor is specially developed for the application in combination with special rubber slots. These lifting anchors are often used in pits, on which the holes are firmly mounted on the under jig and remain on the jig during the breaking away. The P-anchor is a good alternative for the use of the T-slot anchors in fixed steel holes for which a rubber ring brings the necessary clamping, so that during the pouring the anchor remains on his place. The TKS rod-anchor The TKS rod-anchor is provided with a ribbed rod to which a good anchoring can be obtained. For situations in which an anchoring foot cannot be used, a TKS rod-anchor with a adjusted length can arrange a sufficient anchoring. Especially in very small elements such an anchoring is the best solution. The TPA plate-anchor A 4/32

5 The TPA plate-anchor is provided with a footplate with which at a small built-in depth still a good anchoring can be obtained. By adding additional armament over the plate the anchoring force can be improved. The plate-anchors are used in thin floor plates or where longer T-slot anchors cannot be used. The TKA tilting -anchor The TKA tilting -anchor is specially developed for the placement or tilting of wall elements. By its specific form and in combination with a special slot form the TH 2 lifting hook is supported by the TKA tilting anchor itself. In this way no damages occur on the concrete element and still the TKA tilting anchor can be used. The TSG bended T slot anchor For special applications it can be necessary that a standard T slot anchor is bended, so that the anchoring point lays more in the element. For sandwich constructions the lifting point can be adjusted in the center of gravity although the anchoring must be created in the thickest part. A 5/32

6 T slot anchor Characteristics Characteristics of T-slot anchors Anchor Admissible Length Ø A Ø B Ø C type load [kn] T T T T T T T T T T T T T T T T T T T T T T T T T T T T T Anchor Admissible Length Ø A Ø B Ø C type load [kn] T T A 6/32

7 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T A 7/32

8 Anchor type Admissibl e load [kn] Length Ø A Ø B Ø C T T T T T T T P anchor P-anchor type Characteristics of P anchors Axial Length load [kn] Ø A Ø B P P P P O anchor O Anchor type Characteristics of O anchors Axial load [kn] Length Ø A Ø B Ø C O O O O O O O O The TKA tilting-anchor A 8/32

9 TKA-anchor type Characteristics of TKA anchors Axial Load [kn] Length L Ø D1 Ø d TKA TKA TKA TKS Anchor Characteristics of the TPA anchors P-anchor type Axial load [kn] Length H Ø A Ø L x B d Characteristics of TKS anchor TPA Length l x 70 6 TKS-anchor TPA Axial Length 25 L (anchoring) Ø d 70 Ø A x 70 6 type load [kn] TKS TPA x 150 TKS TPA x 90 TKS TKS TPA x 90 8 TKS TPA x 90 TKS TKS TPA x 90 8 TKS TPA 100- TKS x TKS A 9/32

10 The TH 2 lifting hook Anchor type TH 2 13 TH 2 25 TH 2 50 TH 2 75/100 TH 2 150/20 0 TH TH Characteristics of TH 2 lifting hooks Admiss ible A B C D E F G load [kn] The TH 2 lifting hook is a special lifting hook, which is mounted in the slot of the head of the T slot anchor. The big advantage of this lifting system is that the TH 2 lifting hook when lifting under an angle the side force directly changes in the concrete to a pressure force. The slot anchor is hardly submitted to a side force whereby no reduction of the adjustable force has to be applied. A 10/32

11 Lifting under an angle Lifting angles Angle α to concrete [º] Addition factor in force in the lifting part When lifting under a angle there has to be taken into account the enlarging of the forces in the lifting cable. The force has to be multiplied with the factor, which is mentioned in the above table. When the angle in relation to the concrete is smaller than 30º the forces in the lifting cable will increase in such a way that it will beneath. In that case another solution has to be found f.i. longer lifting cables. The use of the TH 2 lifting hook is simple and the coupling is a quick simple action. If the lifting hook is coupled to the T slot anchor, lifting is possible. Advisable is to bring the lip of the TH 2 lifting hook in between the lifting cable and the concrete. In that case when loading under a angle the lip will be pushed to the concrete. For tilting in the air there has to be taken into account that the lip of the TH 2 lifting hook will be pushed to the concrete and not that the possibility arises that the ball of the lifting hook can turn out of the socket in the concrete. The TH 2 lifting hook is standard with an individual certificate according to European norms with which the user for 4 years only visually checks has to be taken for detecting any abnormality and checking if the wear measurements are not over or under passed. A 11/32

12 Checking measurements by reasons of wear to the lifting hook has to be done regularly (at least once a year according to this table IN CASE OF EXCEEDING: DISAPPROVAL TYPE Wear measurements H MAXIMUM M MINIMUM TH TH TH M TH 2 75/100 TH 2 150/200 TH 2 320/ H The TH 2 lifting hook has a safety factor for breaking of 5 After testing of the TH 2 lifting hook with a sample load of 3 times the admissible load, a separate number is punched on the lifting hooks, which is the same as the numbers on the test certificates. The original certificate belongs to the buyer. Copies are saved in the test institute and at Terwa BV. After 4 years the TH 2 lifting hooks have to be tested again independently of the use. A 12/32

13 Attachment of the lifting anchors in the concrete To couple the TH 2 lifting hook to the T slot anchor there must be a socket in the concrete. This socket has a ball form en can be as well as well a half ball and a small ball slot. Different aiding kits are available to realize this socket. For a half ball socket the TH 2lifting hook can be attached in any direction and eventually can turn during lifting in the socket till the lifting hook has arrived its good position. Most usable is the ball socket RB The ball socket RB Dimensions of the ball socket RB Type R A B Ø C RB 13 kn RB 25 kn RB 50 kn RB 75/100 kn RB 150/200 kn RB kn The ball socket RB has a ball form and can be mounted to the formwork with the aid of the attached IP inlay plate, which is applied with thread. The inlay plate can be mounted to the formwork with for instance a bolt. The inlay plate as well as the fixing bolt is available with speed thread In the case that the T slot anchor has to be placed in the concrete at a point with lack of space a smaller socket can be used, the SRB-socket. This socket is just big enough to mount the TH 2 lifting hook to the head of the T slot anchor, but the lifting hook cannot turn any more to all directions The SRB-socket Dimensions of the ball socket SRB Type R M N C SRB 25 kn SRB 50 kn SRB 75/100 kn SRB 150/200 kn SRB 320/450 kn ON DEMAND Beside in rubber the sockets can also be delivered in steel and hard plastic. The SB socket also is deliverable with and without magnets A 13/32

14 Ball socket SB Characteristics of SB ball socket Type D a b c SB M SB M SB M To the SB socket belongs the RR ring. This ring is mounted behind the head of the T slot anchor and has the function of sealing as well to clamp the T slot anchor in the steel ball RR ring Characteristics of RR ring RR ring type D1 D2 T SB SB SB In cooperation with clients as an alternative for the steel SB balls special fixed rubber sockets are developed. These can be used easily in combination with the P anchors without the necessity of a RR ring. The RBP sockets can be fixed on the formwork in such a way that only a P anchors has to be inserted and this one clamps on the second collar of the anchor. A 14/32

15 RBP socket For other specific solutions we can inform you. In cooperation with a number of clients a lot of problems has been solved, such as the mounting possibilities with magnets and the quick thread applications A 15/32

16 Calculation of the T slot anchor The best way of calculating the lifting anchors is step by step. The following steps are in the correct sequence: Determine the weight of the element By a well positioning of the anchors the same loading per anchor can be realized. In the case that one anchor is heavier loaded the anchor has to be chosen for this loading. It is better to apply anchors of the same kind per lifting situation Determine the lifting angle of the hoist cable in relation to the length axle of the lifting anchor. This depends on the adjusting of the length of the hoist cables and the position of the lifting anchors. After determining the lifting angle the calculation factor follows via the table for the force in the lifting cable. Estimation has to be made of the appeared dynamic forces as a result of the lifting or transport method. Lifting with a stationary crane with a fine hoist possibility reduces these forces, while the forces will be increased enormously when lifting in the terrain with a forklift truck. Determine via the table below with which enlargement factor has to be calculated. Lifting in an angle Angle α to concrete [º] Addition factor in force in the lifting part Dynamic forces During the detaching out of the formwork dynamic forces will arise. The size of the dynamic forces depends on the form of the element, the formwork and the use of additions for the detaching out of the formwork. The table gives some directions for the enlargement factor, which can be used. Situation Push factor In a factory with a fixed crane 1,1 to 1,3 Transport with a forklift truck at a flat floor 1,3to1,6 At location with a fixed crane At location with a drivable crane 1,3to1,5 1,5to1,7 Transport with a dredger at an uneven floor 1,6 to 2,0 In extreme cases > 2.0 A 16/32

17 Directions for stick factors Take account of o Oiled formwork o Taking away the side formwork Form of the element Stick factors Beam or pillar 1.0 to 1.10 Vertical plate 1.10 to1.15 Horizontal plate 1.2 to1.25 Floor plates with cassettes > 2.0 For elements with a difficult form higher factors have to be taken, especially for elements where a vacuum can arise during the taking out, such as with cassette floors. The forces can be a multiple of the weight. The action forces per anchor can be calculated as follows: Action Force = (weight x lifting angle factor x bumping factor x stick factor)/ (qty of anchors) When the action force of the heaviest loaded lifting is determined the choice of the type of the lifting anchor must be made. By means of the acting forces the type of the T slot anchor can be determined. With the aid of the added tables can be determined which length of the T slot anchor must be used dependably of the present concrete strength. When lifting in an angle by using T slot anchors no reduction is needed on the permissible load. For the vertical setting of small elements split armament can be necessary by reason that the pressing force of the lifting hook will lead directly his forces into the concrete. In these cases it is good to work with the TKA tilt anchors Split armament can be adjusted in the following way The lifting hook directly leads the pressing force to the concrete and starts approximately half way of the ball socket. That is why the split armament must be applied. See the drawing. A 17/32

18 Anchoring of T slot anchors If the loading type of the T slot anchors has been chosen the length of the anchor has to be determined. Dependably of the form of the element en the strength of the concrete at the first loading a T slot anchor has to be chosen that realizes a larger anchoring force, than is calculated as the acting force. The admissible anchoring force is calculated with a safety factor of 2,5. The foot of the T slot anchor obtains the anchoring. At collapsing of the concrete a dish formed foot arises of the T-slot anchor a break out cone with an incline of 1:3.that is why that relatively small anchoring lengths will do. In this leaflet tables are added, to which in practice most of the situations can be filled in. It is also possible to make an exact calculation of the present situation. On request special tables can be made which fulfils the practical situation at the prefab mill or at the building place. If it is possible to divide elements in the below groups then the following rule of thump can be used. In case of inexperience with the T slot anchor system additional information is always obtainable at Terwa. Type of element: Beams: T slot anchors with the standard length per loading type can be used. Horizontal plates T slot anchors with a smaller length than standard can be used Vertical plates T slot anchors with a larger length than standard must be used Overview of T slot anchor length Loading class [kn] Standard type T-slot anchor Often used shortened T-slot anchor Often used lengthened T-slot anchor 13 T T T T T T T T T T T T T T T T T T T T T T T T T T T All deliverable types of T slot anchors are mentioned in the product documentation and the pricelist and can be delivered in bright, thermic zinced or stainless steel A 18/32

19 The calculation of the anchoring length can be done with the aid of empiric found formulas, with the VBC- 90 or according to the rules being in preparation of the CUR-working group Anchors in concrete. When calculating the admissible anchoring force besides the length of the T slot anchor the present concrete strength is of main importance. Mostly the deforming strength is leading or the concrete strength that is realized at the first loading of the anchors. If any doubt about the admissible concrete force or that by any reason it is not possible to realize additional measurements have to be taken. For instance the concrete force can be enlarged in the location of the T slot anchor by adjusting isolation material, where by higher temperatures in the concrete gives a quicker force development. The addition of extra armament in the armament nets almost never leads to improvement of the anchoring force. Only if the armament is placed around and over the foot of the anchor the anchoring force can increase The anchoring force of the T slot anchor is the biggest when the T slot anchor is placed at a distance to the edge which is 3 times bigger than the built in depth so that a complete break out cone an be created. If it is not possible to have an edge distance to all directions of 3 times the built in depth a better anchoring must be obtained with the aid of a longer T slot anchor. In the table a situation is described which fulfill as well the edge distances in all directions of 3 times bigger the built in length as the situation for which the edge distance is limited to 2 directions. With the aid of these tables a good impression can be obtained of what the real admissible force is in situations that are more or less comparable. In case of any doubt, please contact Terwa. A 19/32

20 For vertical plates must taken into account the possibility that a horizontally break out can occur. Here also the present vertical armament has no effect for the anchoring force. The situation in the sketch becomes very critical if the thickness of the element is smaller than half of the chosen T slot anchor. In this situation additional discussion with Terwa is necessary. To enlarge the vertical anchoring a hairpin can be adjusted which falls around the foot. Also in this situation it is very helpful to use the TKA tilting anchor, an eye anchor or a rod anchor. With these lifting anchor the anchoring is obtained by an armament hairpin through the eye of the anchor or by a ribbed rod. All in this leaflet mentioned situations are valid for most of the cases. For variant situations or elements for which this instruction cannot be used you always can get advice from Terwa. A 20/32

21 Calculation example 1 Floor element: Dimensions 5.00 x 2.00 x0.20 m³ 4 T-slot anchors Concrete strength class B45 Strength at deboxing 20 N/mm² Situation at the works: The element will be taken out of the box with a portal crane. There is worked with an equator to prevent that the angle to the concrete becomes smaller than 75 º. The to be used lifting anchor factor will be Also will be taken into account: A push factor of 1.3 and a Stick factor of 1.2 Situation at the building area: The element will be built up with the aid of a turning crane. There is worked with 2 hooks equator to prevent that the angle to the concrete becomes smaller than 60 º. The to be used lifting anchor factor will be Also will be taken into account: A push factor of 1.3 Determination of the weight: G= 5.00 x 2.0 x 0.2 (m³ x 25 kn/m³) = 50 kn Determination of the arisen force per anchor: At the works: Force per anchor: F = at the building area 50 x 1.04 x1.3 x1.2 = 20.3 kn normative 4 50 x 1.16 x1.3 Force per anchor: F = = 18.9 kn 4 The situation at the works during deboxing is for the choice of the loading class normative T -Slot anchor: T -25 kn Determination of the length of the T Slot anchor" A 21/32

22 According to the Table the T Slot anchor Type T already will do at a concrete strength of 20 N/mm². According to rule of thumb for a Floor element normally a T Slot anchor in shortened implementation can be used. In this case also a T or a T can be chosen. Terwa B.V. can execute for you a special calculation, for which the exact anchoring length can be calculated Final conclusion. The floor element can be hoisted with 4 T Slot anchor Type T in black, zincked or in stainless steel. Choosen positions: Length direction: ca. 1/5 of the length = 1,00 m from the edge Transverse direction: ca. 30% of the width = 0,50 m from the edge A 22/32

23 Table 1 Admissible break out forces for bottom plates This table is value for the mentioned T-slot anchors at the condition that the distance to the edge of the element is more than 3 times the built in depth or for heavy T-slot anchors a minimum distance of 500 mm The in the table indicated values are the minimum anchor forces at indicated concrete strength in N/mm² Built in Concrete strength at first load: [kn] Anchor type depth 10 N/mm² 15 N/mm² 20 N/mm² 25 N/mm² T > 13 > 13 T > 13 > 13 > 13 > 13 T > 13 > 13 > 13 > 13 T >25 >25 T >25 >25 >25 >25 T >25 >25 >25 >25 T T >50 >50 >50 >50 T >50 >50 >50 >50 T >75 >75 T >75 >75 >75 >75 T >100 >100 T >100 >100 For heavy T-slot anchors a minimum distance of 500 mm is applicable T >150 >150 T >150 >150 T T >200 T T A 23/32

24 Calculation example 2 Façade element: Dimensions 5.00 x 2.00 x0.20 m³ 4 T-slot anchors for deboxing 2 T-slot anchors for transport and mounting Concrete strength class B45 Strength at deboxing 20 N/mm² Situation at the works: The element will be taken out of the box with a portal crane with the in example 1 calculated T-slot anchors. In free storage the façade element will be brought to a vertical position (attention be careful for damages of the edge or use a TKA anchor. At bringing in a vertical position there is worked with an equator to prevent that the angle to the concrete becomes smaller than 75 º. Hereby rests the element still on the floor, so that the T-slot anchors only hoist half of the weight. Only when the element is in a vertical position it can be hoisted and the T-slot anchors will be loaded with the full weight. That is why the bringing of the element into a vertical position is not a normative loading. Also when deboxing and directly bringing into a vertical position with the aid of 2 T-slot anchors to the front side will not give a normative loading as well. While lifting with an equator: The angle to the concrete is about 90º The to be used lifting anchor factor will be Also will be taken into account: A push factor of 1.3 and a Stick factor of 1.2 (only by reason of the deboxing, so not normative. A 24/32

25 Situation at the building area: The element will be built up with the aid of a turning crane. There is worked with 2 hooks equator to prevent that the angle to the concrete becomes about 60 º. The to be used lifting anchor factor will be Also will be taken into account: A push factor of 1.3 Determination of the weight: G= 5.00 x 2.0 x 0.2 (m³ x 25 kn/m³) = 50 kn Determination of the arisen force per anchor: At the works: Force per anchor: F = At the building area Force per anchor: F = 50 x 1.00 x 1.3 x = 39 kn 50 x 1.16 x1.3 = 37.7 kn 2 The situation at the building area is for the choice of the loading class normative T -Slot anchor: T -50 kn Determination of the length of the T Slot anchor" According to the Table the T Slot anchor Type T already will do at a concrete strength of 20 N/mm². (Minimum anchoring force Z= 32.9 kn) According to rule of thumb for a facade element normally a T Slot anchor in extra long implementation can be used. In this case also a T or a T can be chosen. Terwa B.V. can execute for you a special calculation, for which the exact anchoring length can be calculated Final conclusion. The facade element can be hoisted with 2 T Slot anchor Type T in black, zincked or in stainless steel. Chosen positions: Length direction: ca. 1/5 of the length = 1,00 m from the edge Transverse direction: in the middle of the material thickness Table 2 Admissible break out forces for façade plates & beams A 25/32

26 This table is value for the mentioned T-slot anchors at the condition that the distance to the edge of the element is more than 3 times the built in depth and the anchor is built in the middle of the material thickness a minimum distance of 500 mm The in the table indicated values are the minimum anchor forces at indicated concrete strength in N/mm² Concrete strength at first load: [kn] Anchor type Built in depth Wall thickness 10 N/mm² 15 N/mm² 20 N/mm² 25 N/mm² 30 N/mm² T T > 13 > 13 T > 13 > 13 > 13 T > 13 > 13 > 13 > 13 > 13 T T >25 T >25 >25 T >25 >25 >25 >25 T T T T >50 >50 T >50 >50 T >50 >50 >50 >50 T T T >75 >75 T >75 >75 >75 T T T >100 >100 >100 T >100 >100 >100 >100 T T T T T Calculation example 3 A 26/32

27 Determination of the maximum weight Starting points: Façade element: For the transportation 2 T-slot anchors are put in the front side For deboxing use 4 T-slot anchors or bringing the element in vertical position with the 2 T-slot anchors in the front side(attention be careful for damages of the edge) Strength at deboxing 15 N/mm² Situation at the works: In free storage the façade element will be brought to a vertical position (attention be careful for damages of the edge or use a TKA anchor At bringing in a vertical position there is worked with an equator to prevent that the angle to the concrete becomes smaller than 75 º. The angle to the concrete is about 90º The to be used lifting anchor factor will be Also will be taken into account: Push factor = 1.3 Determination of the arisen force per anchor G max. x 1.00 x1.3 Arisen force: F = 2 anchors In table 3 an overview of the maximum weights has been given for the façade elements when using 2 T- slot anchors of the in the first column mentioned types. For all the cases in between or divergent positions Terwa B.V. can make a special calculation or make a special table for your works. A 27/32

28 Determination of the arisen force per anchor: At the works: 50 x 1.00 x1.3 x1.2 Force per anchor: F = = 39 kn 2 At the building area: 50 x 1.16 x1.3 Force per anchor: F = = 37.7 kn normative 2 The situation at the building area is for the choice of the loading class normative T -Slot anchor: T -50 kn Determination of the length of the T Slot anchor" According to the Table the T Slot anchor Type T already will do at a concrete strength of 20 N/mm². (Minimum anchoring force Z= 32.9 kn) According to rule of thumb for a Floor element normally a T Slot anchor in extra long implementation can be used. In this case also a T or a T can be chosen. Terwa B.V. can execute for you a special calculation, for which the exact anchoring length can be calculated Final conclusion. The floor element can be hoisted with 2 T Slot anchor Type T in black, zincked or in stainless steel. Chosen positions: Length direction: ca. 1/5 of the length = 1,00 m from the edge Transverse direction: in the middle of the material thickness A 28/32

29 Table 3 Maximum weights of façade plates and beams This table is mentioned for the T-slot anchors as described under the condition that the distance to the edge of the element in 2 directions is more than triple of the built in depth and that the anchor is positioned in the middle of the material thickness Also the distance between the T-slot anchors must be more than 6 times of the built in depth the in the table mentioned values are the maximum weights of the elements at a concrete strength of 15 N/mm². With this the use of an equator as well as a push factor are indicated Anchor type Built in depth Wall thickness Arisen force per anchor [kn] Maximum weight of the element with 2 anchors [kn] T T T T T T T T > T T T T T T T T T T T T T T T T T T T T When the concrete strength at first lifting has another value as 15 N/mm² of course the maximum weight of the elements are different At indication other tables can be made. Calculation example 4 Façade element: Determination of the maximum weight A 29/32

30 Starting point For the transportation 2 T-slot anchors are put in the front side For deboxing use 4 T-slot anchors or bringing the element in vertical position with the 2 T-slot anchors in the front side(attention be careful for damages of the edge) Strength at deboxing 35 N/mm² Situation at the works and at the building area: In free storage the façade element will be brought to a vertical position (attention be careful for damages of the edge or use a K2 kip anchor. At bringing in a vertical position there is worked with a spring is used with a top angle smaller than 60 º. The to be used lifting anchor factor will be Also will be taken into account: Push factor = 1.3 For deboxing other T-slot anchors are used. That is why no stick forces have to be taken into account. Also when the bringing in vertical position from out the box is used then also the stick forces are not normative, because of only the halve of the forces have to be taken into account Determination of the arisen force per anchor G max. x 1.16 x 1.3 Arisen force: F = 2 anchors In table 4 an overview of the maximum weights has been given for the façade elements when using 2 T- slot anchors of the in the first column mentioned types. For all the cases in between or divergent positions Terwa B.V. can make a special calculation or make a special table for your works. Table 4 Maximum weights of façade plates and beams This table is mentioned for the t-slot anchors as described under the condition that the distance to the edge of the element in 2 directions is more than triple of the built in depth and that the anchor is positioned in the middle of the material thickness Also the distance between the T-slot anchors must be more than 6 times of the built in depth The in the table mentioned values are the maximum weights of the elements at a concrete strength of A 30/32

31 35 N/mm². At bringing in a vertical position there is worked with a spring is used with a top angle smaller than 60 º. Maximum Arisen force per Built in depth Wall thickness weight of the Anchor type anchor element with 2 [kn] anchors [kn] T T T T T T T T T T T T T T T T T T T T T T T T T T T T When the concrete strength at first lifting has another value as 35 N/mm² of course the maximum weight of the elements are different At indication other tables can be made. Threat analysis Threat Mechanical threat by finger injuries at screwing in hoisting noose Mechanical threat by finger injuries at screwing in hoisting noose in the transport anchor Overload of the transport anchor by wrong hoisting direction Overload of the transport anchor caused by not using a transverse or equator Risk Counter measurements S C: One and two hand operation is possible; at least: trained personnel at works and at the building area S UI: suggestion for put down the elements on blocks S S UI: load values have taken into account wrong hoisting directions UI: load values have taken a 3 times safety factor for such mistakes A 31/32

32 S= small UI=user instruction ==================== A 32/32