JPS6138042A - Apparatus for applying grease to terminal of prestressed reinforcing material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention consists of some reinforcing materials used for stress-stressing concrete members by applying tension, contained within grease-filled sheaths. Relating to the application of grease to the end of a reinforcement that is interrupted just short of the end of the reinforced side.

In particular, the end to which the wreath is to be applied is formed by a discontinuous truncated conical ridge of the wedge in the rigid plate which is in contact with the concrete member to be rested; Concerning what is fixed in a conical housing.

The large diameter end of the housing sig forms the center of the cosmic crease of the plate, while the other ends of the housing sig are connected to the other end of the corresponding sheath in a grease-tight manner to each other, especially by means of a plastic funnel.

Known embodiments of these assemblies include hollows, cups, frustoconical wedges, haws; jigs, connecting funnels or the like and volumes formed by mutually communicating spaces contained within the sheath. To complete the filling of the grease, the grease is injected into the volume through the holes provided at the bottom.

This method has some drawbacks, in particular the following.

In order for the grease to be able to penetrate fairly deeply into the volume to be filled, ie to the level of the sheath, a relatively high pressure must be applied to it during the injection of this grease.

This high pressure requires the use of mechanically strong and correspondingly expensive caps and hermetic seals between the cow set and the opposing tip.

However, even if the injection pressure is extremely high, grease filling itself is problematic because the grease itself introduced into a narrow gap prevents the bubbles that the grease would take up to escape from the gap.

The object of the invention is to eliminate these drawbacks by ensuring a complete grease filling in a simple manner, without the need for particularly high injection pressures.

For this purpose, according to the invention, on the one hand, a groove whose center line is parallel to the generatrix of the truncated cone defining this groove (71) is provided in the frustoconical inner surface of the eight rings of the wedge; The shaft is provided with a hole which can be brought in line with the extension of the groove when the shaft is attached to the tip.

It is thus possible to ensure the desired grease filling through the straight hollow needle passing one after the other through the passage defined by this hole and the groove and the opposite wedge.

To accomplish this filling, the grease needle is first introduced to the bottom of both these aligned holes and grooves so that the distal end of the needle protrudes very close to the sheath distal end, and then the grease is threaded through the needle. After introducing the grease until it flows backward from the gap, continue injecting the grease while withdrawing the needle until the withdrawal is complete.

In a preferred embodiment, complementary means are provided to automatically bring the shaft hole into the extension of the groove after installing any of the equipment described below.

- The cow goat and the cup are designed so that the former can be attached to the latter in a bayonet-like manner, and the complementary means described in the preceding paragraph is provided in French Patent No. 83056 for the cow goat and the cup, respectively.
According to No. 12, there are two complementary contact surfaces which contact each other at the end of the angular movement of the shaft, so as to terminate the bayonet-type attachment.

・　+Cep is made of plastic.

- The sheath and greased reinforcement are formed by a single strasid.

In addition to these main facilities, the present invention includes some other facilities,
These are preferably used simultaneously and are further explicitly discussed below.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings, but the present invention is not limited thereto.

The reinforcement considered is for restoring a concrete structure or member 1 by tensioning it between its ends, preferably a wire wrapped around a centerline of slightly larger diameter. It is formed from stracids 2 formed from (plural).

In a manner known per se, this strasid is itself surrounded by a sheath 3 made of plastic, for example polyethylene, and the volume between the sheath and the line forming the struss is filled with grease.

Application of such a sheath and grease allows for relative sliding between the sheath and the reinforcement after placing the concrete around the sheath, which facilitates tensioning the reinforcement. , which also has the dual advantage of protecting this reinforcement from corrosion and especially from moisture.

One end of the strashid is made of a metal plate 4, particularly cast iron, with a thicker central part, and a truncated conical housing 5 at the center.
It is held in place by a fixing device consisting of something pierced through.

This housing 5 is adapted to cohesively receive the end of the reinforcement in question, which is surrounded by a set of three wedges 6 forming a ring divided along three longitudinal gaps 7. . ° Each of these wedges extends approximately 120° around a center line common to the structide 2 and the housing 5, and has a cylindrical inner surface K-shaped to meet the struts and a truncated truncated head that contacts and complements the housing. It has a conical outer surface.

A frusto-conical opening ': the rim of the small diameter end of the J-hole 5, more precisely the cylindrical collar 8 extending axially from this mouth, is the sheath 3 - the sheath is il! A6 is interrupted in front of the end of this reinforcement so that A6 can grasp the reinforcement 2 - by means of a suitable funnel 9 made of plastic whose cylindrical end is a pressure fit to the collar. They are connected to each other in a sealed manner.

The other opening of the housing 5, that is, the edge of the large diameter end, has 10 sets.
It is in the shape of a rotating C-P cup that is hermetically closed by 1.

Furthermore, according to the invention, the following are formed: On the inner surface of the truncated conical housing 5, a longitudinal linear groove 12 parallel to the generatrix of this surface; 11 to the cup 10, the groove 12
The cross-section of these grooves 12 and holes 13 allows a straight hollow needle 14 for filling the device with grease to be passed therethrough, preferably with a play. It is. This will be described in more detail later. - The outer diameter of this needle is generally between 1.5 and 3 mm, so that the width of each of the grooves 12 and seats 13 is preferably between 2 and 5 mm.

The profile of the groove 12 is preferably U-shaped.

Contrary to what might be thought, the presence of these grooves on the inner surface of the housing 5 does not in any way interfere with the positioning and maintenance of the wedges 6, nor is the angular position of these wedges with respect to the grooves around the centerline of the device quite important. Not.

One of the gaps 7 separating two adjacent wedges may then face the groove 12, and likewise that groove may be covered over its entire width by the same wedge. - Considering that in the latter case the angular width of the groove 120 extends on the order of 10° from the center line of the device, this width corresponds to the area of contact between the considered wedge and the frustoconical inner surface of the housing 5. That's only about one-tenth of that amount.

Tip: It is desirable to make the fittings 11 so that the holes 13 are automatically aligned with the grooves 12 when the latter is attached to the former.

For this purpose mutual angular positioning means are provided on each of these two elements 10, 1a1.

According to a particularly advantageous embodiment, the element is produced in the manner described in the above-mentioned French patent.

In other words, the two elements in question, whose mutual assembly is achieved by a bayonet movement guided by the flange 15, 16 provided on the cap and the interrupted circular ring 17 provided on the tip; The end point of the angular movement forming the second end phase is defined angularly tangent to one of the projections 17.

In this way, the following procedure is followed to groove the internal volume of the assembly with grease.

After attaching the goat to the tip, the needle 14 is then pushed through the hole 13 and the groove 12.

The tip 18 of this needle then projects within the funnel 9, close to the distal end of the sheath 3.

Grease is injected into the needle by means of a grease copple 19 permanently or temporarily attached to the rear end of the device 14, which deposits the grease directly into the deepest region of the volume to be filled.

The air ejected from these areas then flows outward in the opposite direction through all empty passages, in particular through the cleft 7 and through the part of the groove 12 not occupied by the needle 14 itself.

The evacuation of this air from the cap 11 takes place preferentially through a second hole 20, which is provided in the bottom of the cow rack and is then open, but can also take place through the hole 13 itself; In that case, its cross-sectional area will be larger than that of the needle.

The needle may be removed gradually as the assembly is filled with grease, but it is preferable to wait until the grease begins to flow back out of the kap before initiating this removal.

At that time, perform this removal procedure quite slowly,
The volume gradually emptied by the grease-filled needle is immediately filled with the grease that the needle continues to supply. After the needle is completely removed from the needle, hole 13 and hole 20 are removed.
If it is set, it is also closed.

This closure can be effected in any desired manner, by means of a stopper associated with or independent of the cow set.

Grease filling of the device is then complete.

Means are eventually provided for filling the anchoring device of the restless stiffener with grease according to both embodiments, the structure and operation of which are sufficiently clear from the foregoing.

These measures have several advantages over those previously known.

In addition to the complete filling mentioned above, another important advantage lies in the relatively low pressure required for greasing. In fact, the amount of air evacuated during filling can be evacuated freely, and this evacuation is not hindered by the injected grease. What is further noteworthy is that this pressure, which itself is relatively low, is +
At the level of the needle, the air and/or grease coming out of the needle tip is subtracted by the pressure drop that occurs when this air and/or this grease passes through a discharge channel with a reduced cross-sectional area. only. Therefore, the cap can be made of a material with relatively low mechanical strength, such as one of the plastics described in the above-mentioned French patent, which has the advantages of both low cost and ease of use. This has the advantage of eliminating the need for separate seals and providing an extremely long service life.

As is clearly apparent from the above, the invention is in no way limited to the specifically discussed forms of application and embodiments. On the contrary, it includes all variations thereof.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the end of the restless reinforcement with sheath and grease applied, its fixing device, and its grease filling device according to the present invention, and FIG.
FIG. 1... Concrete member 2 Reinforcement material 3... Sheath 4... Rigid plate 5... Housing 6... Shade 7... Crack
8... Color 9... Funnel 1o.
...Cop 11...+Yap 12...Groove 1
3...hole 14...needle 15.16...
・Protrusion 17... Rizu 18... Needle tip
19... Grease copple 20... Hole diagram 1

Claims (1)

[Scope of Claims] 1. A device for applying grease to the end of a reinforcing member (2) for applying prestress to a concrete member (1) housed within a sheath (3) filled with grease, the sheath comprising: extends just short of the end of the reinforcement, which end is formed by a wedge (6) in the form of a discontinuous frusto-conical ring in a rigid plate (4) in contact with the concrete member to be prestressed. It is fixed in a truncated conical housing (5) that is complementary to the above-mentioned ring, and the large diameter end of the housing, that is, the end that is open on the side opposite to the concrete member of the rigid plate, is covered with a cap ( 11) forming the central part of the cup (10) which is itself sealed against grease, while the other end of the housing is connected via a grease seal to the end of the corresponding sheath, A linear groove (12) whose center line is parallel to the generatrix of the frustocone defining this housing is provided on the frustoconical inner surface of the housing (5) of one wedge (6), and the cap (11
) is provided with a hole (13) located on an extension straight line of the groove when the cap is attached to the cup. 2. Complementary means for automatically positioning the hole (13) of this cap on the extension of the groove (12) after attaching the cap (11) to the cup (10) is provided in this cap (1).
1) and a cup (10). 3. The cap (11) and the cup (10) are provided for bayonet-type attachment of the former to the latter, the prosthetic means having two prosthetic contact surfaces (16) on this cap and on this cup respectively. ), (17) are adapted to contact each other at the end of the angular movement of the cap to complete the bayonet-type attachment. 4. The grease device according to claim 1, wherein the cap is made of plastic. 5. Grease device according to claim 1, characterized in that the reinforcement (2) is formed by a single strand. 6. A straight hollow needle (14) is provided that passes continuously through a hole (13) provided in the cap and a groove (12) in line with this hole, and a grease nipple (14) is provided at one end of the needle (14). 19) is attached to the grease device according to claim 2.