MXPA01000183A - PROCESS FOR THE ARTICULATED IMBRICATION OF CONCRETE SLABSói(IN SITU) - Google Patents

Abstract

The invention relates to the articulated imbrication of concrete slabsói(in situ) wherein joints are formed by layingói(in situ), along joint lines, a simple armored mesh device with a cut and fold pattern which has been already prepared in the workshop. Advantage is taken from the retraction phenomenon in order to achieve an alternative indentation along the joints of adjacent slabs of continuous cast concrete, susceptible of forming satisfactorily a knee- or gimbal-joint connection between the joints. The process is complemented with a concrete separator element which facilitates the formation of the crack and prevents water from reaching the platform, and which can be fixed to said device. The invention applies to concrete surface roads, highways and harbour zones of goods warehouses and enables to design and make road surfaces without bases and subbases.

Description

PROCEDURE OF ARTICULATED IMBRICATION BETWEEN CONCRETE SLABS IN SITU Field of the invention The present invention relates generally to an articulated interlock process between concrete slabs in situ. More specifically, the invention concerns a method of forming joints in linear works and in situ concrete pavements such as roads, streets, highways, railways, canals and esplanades of ports and airports, together with the devices for their execution.

BACKGROUND OF THE INVENTION Io) The classic steel pins covered by a plastic, located towards half the thickness of the slab, have the disadvantage of creating strong localized pressures that end up giving slack to the concrete hollow in which they are, reducing their effectiveness. For this reason, large slab thicknesses or lower base and sub-base layers are necessary. On the other hand, the insertion of lateral pins is a subject not satisfactorily resolved. Ref: 126257 2 °) The corrugated plates, arranged vertically to the ground and anchored in it, force a lateral feeding, decreasing the performance of the work and forcing to have another lateral access. They have not worked, since they do not achieve the intended formation of the teeth and therefore do not achieve the transmission of loads. 3o) My Spanish applications P-9402515"Coplanar coupling system between concrete slabs", presented on 9 / December / 1994, and P-9500530"Joint system between concrete slabs and similar", presented on 9 / March / l995 , and my application PCT / ES95 / 00072"Procedure for the construction of linear concrete works with internal holes and devices for their execution", presented on June 9, 1995. These systems need the load on the edges of the adjacent slabs immediately after making the surface groove and before the concrete begins to retract, which sometimes causes more cracks than desired, causing the insecurity of these systems. The procedure that is now described occurs completely naturally or automatically, so it is safe.

BRIEF DESCRIPTION OF THE INVENTION The procedure described uses, by means of a device, the retraction of the concrete in order to leave the edges of the resulting slabs resting against each other. It is complemented with a separating element that prevents the arrival of water to the esplanade through these edges and that can be attached to the mentioned device.

The device is a mesh of corrugated steel that is placed with its parallel axis and contained in the plane of the axis of the joint to be obtained. Cut and fold several threads, perpendicular to the mesh axis, to the side where no cuts have been made, forming an angle. The existing threads beyond are cut on the other side of the mesh shaft and bend in the opposite direction to the previous ones. Following this, we obtain some irons alternately inclined on one side and the other of the grid axis, which will be part of the inclined support surfaces of a slab on the one next to it. This form of the mesh leads the fissures that are created from the top down and in the same way it does for the fissures that are created from bottom to top, forming a unique fissure.

BRIEF DESCRIPTION OF THE DRAWINGS A more detailed description of the invention is given below with reference to the attached drawings, in which: Fig. 1 represents the mesh floor where the situation of the cuts made is observed. Fig. 2 shows a section perpendicular to the joint coincident with a bent thread. Fig. 3 represents the perspective plant of a mesh.

Figs. 4 and 5 respectively represent: a section with another possible arrangement of the mesh and a perspective of the plant thereof, the hidden lines being omitted in Fig. 4. Fig. 6 represents the perspective of an isolated slab, executed by means of the procedure described. Fig. 7 shows a section exclusively with the wires that assemble the incoming area and hold the separating element. Fig. 8 shows in plan the previous threads of Fig. 7. Fig. 9 shows the section with the device and the reinforcement of the incoming area, the hidden lines having been omitted.

Detailed description of the invention In Fig. 1 we see the plant of the mesh 2 to be used for the formation of the joint of Fig. 2, where the cuts 6 and 7 are indicated in the threads 11 to then fold the portions 13 and 14 which originate, up to the shape shown in the perspective of FIG. 3. FIG. 2 shows a mesh of corrugated steel 2 on the floor 10, or next to it. The wires 11 of mesh 2 parallel to axis 1 will be cut in 6 and 7 alternately on one side and another of the same. The mesh portions 13 and 14 between two successive cuts of the same yarns are folded around a parallel yarn and close to the axis 1 of the mesh 2 until the projection of the parallel yarn farthest from the axis is on the other side thereof. The described procedure for forming the teeth 13 and 14 of the mesh 2 admits other alternatives. In Fig. 3 it is possible to do without the parallel and more distant threads of the axis supported on the ground and take advantage of this part 12 of the mesh 2 to form a reinforcement of the incoming area 15 (Fig. 6) as seen in Figs. 7 and 8, which can also be used to fasten, with a staple 17 or similar, the separating element 3, being located on top of the device object of the invention and separating from it by means of a piece of plastic 18 or similar, according to Fig. 9 in FIG. that do not include steel rounds not seen in the section. These teeth 13 and 14 have to be formed with corrugated steel or other material adherent to the concrete and with an elastic module superior to it. In the upper part of the crosspiece left by the folded mesh portions 13 and 14, the separating element 3 is placed, which may be fastened to said portions, if the reinforcement of the incoming areas 15 is omitted. Once the concrete has been spread, due to the element 3 that weakens the section in which it is located and the alternately bent mesh portions 13 and 14, both the retraction experienced by the concrete while hardening and the loads subsequently applied to it, will create a cracking surface 5 alternately inclined according to the bent mesh portions 13 and 14, forming incoming and projecting areas 15 and 16 between slabs 8 and 9 that leave them resting against each other. The wire 4 perpendicular to the axis 1 that lies between an incoming area 15 and another projection 16 of the same slab, is not cut to serve as a link between the portions 13 and 14 that are formed in the mesh 2, keeping it attached for its manageability in the displacement, location and strength while concrete. In Fig. 4, a section with another possible arrangement of the mesh 2 for the formation of the joint has been represented. In this arrangement, the mesh axis is coincident with a thread and the folded mesh portions 13 and 14 are parallel to the ground. In Fig. 5 the perspective of the plant of the previous mesh is observed, where it can be seen that, in this case, the thread that is not cut is coincident with the axis 1 of the mesh 2, being similar to those of Fig. 3 the other cuts. The axis of the element 3 will be in the plane of the axis 1 of the mesh perpendicular to the floor, the separator element being fastened to the folded mesh portions 13 and 14 and with its top part flush or close to the surface of the floor. This proximity will make unnecessary the execution of the surface groove of the pavement, also having the advantage of its correct location. The separating element 3, in addition to the function of weakening of the section for the formation of the cracking surface 5 forming the support zones 15 and 16 between slabs, can prevent with a waterproof joint the penetration of water through the figure 5, guaranteeing that the upwelling of fines does not occur by pumping (pumping effect). The advantage that the procedure provides is that it eliminates the relative vertical movement between slabs, due to the gear that occurs between the aggregates of the surface resulting from the cracking., so pumping is also avoided. Execution is also allowed over a layer of agglomerate, without the appearance of cracks in said layer. This system not only replaces the traditional pins, but also saves the base and sub-base layers that until now were necessary for heavy traffic. The lateral sides of the slabs in which usually did not put pins, can also remain with the type of support proposed, obtaining conditions of contour of the slabs that greatly reduce tensions, being able to execute slabs with less thickness and the same structural strength . In Fig. 6 the perspective of an isolated slab has been represented, where the resulting cracking surface 5 can be seen, forming incoming and outgoing areas 15 and 16 that mesh the adjacent slabs. The procedure is the same if the separating element 3 is placed perpendicular to the ground, resting on it; and mesh 2 with its part parallel to the ground, close to the surface of the pavement. It is as they would be if the slab is turned over. The procedure is analogous if the broken line, formed by the cutting of the threads, forms the separating element 3 and the mesh 2 is cut according to the axis 1.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Claims (2)

CLAIMS Having described the invention as above, the content of the following claims is claimed as property:

1. Procedure for forming joints in concrete pavements in situ, characterized in that means are provided that are embedded in the concrete, to predetermine the cracking of the concrete. same, on rough inclined surfaces, existing several areas in the joint in which the direction of the inclination of the rough surfaces of fissure varies from a zone to the contiguous one, these means having an elastic limit superior to the concrete and good adherence with the same , being alternately placed on one side and another of the plane of the axis of the joint perpendicular to the floor, inclined at the same angle with respect to the ground, and the direction of the inclination varying alternately on either side of said plane. Method for forming joints according to claim 1, characterized in that the means for predetermination of the crack consist of a mesh with some of its cut and bent yarns that determines the areas with fissured surfaces inclined in different directions.