DD211098A1 - ADHESIVES FOR LOADING CONCRETE COMPONENTS FROM CONCRETE - Google Patents

Abstract

The aim of the invention is to achieve a steel saving in prefabricated concrete. The invention relates to a preferably used in the field of construction slinging. The invention is preferably used in construction in storage, transport, handling and assembly processes for the introduction of lifting forces in concrete precast concrete application and allows to reduce the steel requirements and the manufacturing cost in the production of finished parts. The invention is d. Exer. underlying, in a simple way plate-like finished parts without Tragoesen, without concreted anchor bars or without encrusted support body lift u. to pivot by means of a crane u. to assemble. Invention. will d. Exer. solved by guiding the 4 pieces of "Rerott scissor claws" hanging from a truss through existing rectangular scarf channels and spreading them by a handle and locking them at the same time. Field of application of the invention is the construction industry.

Description

Title of the invention

Lifting gear for load-bearing concrete precast elements

Field of application of the invention

The invention of the sling "Rerott scissor claw" is preferably used in construction in storage, transport, handling and assembly processes for the introduction of lifting forces in precast concrete applications.

In particular, the use in assembly-housing construction for the installation of precast ceilings without lifting lugs is possible and expedient «

Characteristic of the known technical solution

The most well-known and most frequently used solution is the entry of lifting forces into finished parts via cast-in lifting eyes ·

The disadvantage of this solution is that a very high proportion of steel is needed for the lifting lugs, which no longer has to fulfill a static task after assembly. The assembly of finished parts with lifting eyes thus requires unnecessary increased steel consumption.

As a result of this finding, more and more special stop means are used to ensure a tragösenlosen stop the finished parts. For plate-like finished parts to be transported in a horizontal position, e.g. Hammer wedge and rope hanger with suspension pin used. These are listed and described in the construction catalog load handling equipment in construction - Berlin 1978 »In the same catalog are also the hangers with carrying bolts for

thin-walled finished parts such as angle support elements described. Another solution for the introduction of lifting forces in precast concrete is published in DDR PS 97873. Here, a solution has been proposed in which a pin is inserted vertically into intersecting recesses in the precast concrete part. This is secured by a steel rod against pulling out, which is stuck through a side recess.

Due to the complicated switching technical effort for the required recesses, this solution is not suitable for large-scale application. * Another known solution involves the entry of lifting forces in finished parts by means of a rod with a plate-like thickened concreted end. By a special device, the other thickened end, which is exposed in a recess, taken to load picking. Another solution to the entry of lifting forces in prefabricated parts was partially practiced with a special crossbar and hammer bolts on cast anchor bars. Here are the attached to a special traverse hammer bolts in recesses of the finished parts to lead to rotate axially by 9o °, fasten with screws and after transport again to solve and pull out. In catalog 1-68 are more detailed descriptions. The disadvantage of this solution is that a special traverse is required to record the lifting forces in the finished parts. In addition, a very high steel consumption for the anchor bars and a lot of effort for tightening and loosening the hammer bolts is connected.

 Another proposal involves the precast concrete parts by means of rod-shaped support body with a lower-side hammerhead-like training, which are attached to a Yierseilgehänge lift. Here, the support body must be introduced with the hammerhead-like training in Schalkanäle to under-cast steel plates with slots. The locking is done by 9o ° rotation of the support body. Disadvantages arise in the lock, since the let about 2o kg s.

2 kg supporting body only difficult to turn axially by 9o °

2 QKT. 1982 * 04374:

At an inclination of 3o °, stay cables up to 0 39 mm are required.

A solution has been proposed with a device for load bearing of finished parts in the patent 1556o7. Here, the stop means consist of two pairs of parts of a support body with lower hook-like design.

The support bodies are guided by formwork channels until the hook-shaped formations engage under cast-in anchor bars. The vertically directed forces are entered via the anchor bars and the horizontal forces on the Leibungsdruck, which is caused by the diagonal pull of the rope hanger in the finished parts. The locking is done by means of a handle, which is inserted into the Schalkanal. Disadvantage of this solution is that the installation of the anchor bars and the production of the necessary Schalkanals is technically very complicated and expensive. Sine application in finished parts in battery production is practically not feasible.

Object of the invention

2iel the invention is to offer a stop means for the initiation of lifting forces in plate-like precast concrete parts to reduce the steel requirements and manufacturing costs in the production of these precast parts, wherein in the production of Schalkanäle larger tolerances in the position assurance are allowed.

Explanation of the essence of the invention

With the invention, a technical solution for the safe introduction of lifting forces in plate-like finished parts is offered.

With the invention, it is possible to easily lift plate-like finished parts without lifting lugs, without embedded anchor bars or without concreted support body and to pivot and mount by means of a crane. According to the invention the object is achieved in that hanging on a traverse 4 pieces "Rerott scissor claws" by

2 ROK. 1982 * 043 743

existing rectangular Schalkanäle out and be spread by a, handle and locked at the same time. The claw feet located at the lower end of the "Rerott scissor claw" thus reach under the concrete slabs and are thus able to enter the lifting forces from below into the finished parts. Condition for the application is the stacking of the finished parts on 4 cm thick pads or the like .. The "Rerott scissor claws" are connected by ropes with shackles with the crossbar, which ensures a straight line. Thus, a release of the crossbar is straightforward, if it is to be used for other assembly or transport purposes.

When introducing into the existing Schalkanäle and the simultaneous spreading and locking the "Rerott scissor claws" no screwing or joining of carrier parts are required

 The "Rerott Scissor Claw" is composed as follows:

1 medium thick retaining claw 1 pcs 2 outer thin retaining claws 2 .ι 3 thin connecting straps 2 It 4 reinforcement plates 4 tt 5 thick connecting strap 1 It 6 Shackles 1 ti 7 Fuse handle 1 It 8th track bolts 2 ti 9 hinge pins 1 It 1ο Locking pins 2 ti

embodiment

The invention of the "Rerott-Scherenklaue" will be explained below by way of example.

The "Rerott" scissor claw attached to a crossbar by means of shackles 6, consisting of items 1-5 tind 7-1 o is guided through the scarf channel in the folded state - FIG. 3 and spread by slight pulling on the shackle 6 and pushed down secured and locked against unintentional collapse of the securing handle 7. Thus, the "Rerott scissor claw" is ready to receive loads.

- 5 OQ OUT -IQRO * nAQt /

The same procedure should be repeated for the remaining 3 "Rerott scissor claws".

When attacking the lifting force, the introduction of the vertically acting force component via the middle, thick retaining claw 1 and the two thinner, outer retaining claws 2 from the bottom of the finished part in the 'finished part takes place · The horizontal, resulting from the expansion force components are by the siding pressure in Schalkanal 11 registered in the precast concrete 12.

 - 6 ο ο nuT 40 Q '0 * Π Λ Q

Claims (4)

-. ° -. , 4L £ | H J H U claim of invention; 1, lifting means for load-bearing precast concrete elements, characterized in that by means of a scissors claw 1.-1 o, which is guided through a Schalkanal 11 in the finished part 12, upon attacking the lifting load a spreading effect of the "Rerott scissor claw" is formed - Figure 1 so that the load-bearing-capable claw feet grip under the finished part and transmit the vertical forces into the finished part from below. 2 "stop means by point 1, characterized in that instead of the two thin connecting straps 3 and the thick connecting strap 5 and shackle 6 and tab bolt 8 and ropes directly on shackles on the retaining claws 1; 2 can be fixed without the effect of the invention of the "Rerott scissor claw" is lost. 3. Slings according to items 1 and 2, characterized in that the "Rerott-scissor claw" for striking and loosening the finished parts without any screwing handled and secured and locked so / ie for entry of the lifting loads in the finished part no anchor bars, concreted supporting body or Reinforcing bar needed. i 4. slings according to item 1-3, characterized in that in the event of wear of individual parts 1-9 a light, uncomplicated replacement is possible. lierzü