GB2254642A

GB2254642A - Filler injection

Info

Publication number: GB2254642A
Application number: GB9106146A
Authority: GB
Inventors: Mei-Hui Lai
Original assignee: KING TECH REHABILITATION CO LT
Current assignee: KING TECH REHABILITATION CO LT
Priority date: 1991-03-22
Filing date: 1991-03-22
Publication date: 1992-10-14
Anticipated expiration: 2011-03-22
Also published as: GB2254642B; GB9106146D0

Abstract

A filler injector for concrete in filling of cracks includes a device with coaxial tubing 23, 25, piston 27, and spring 28 so that when the crack is full, the filler pressure pushes the piston back. This minimises the risk of bursting of the filler supply system, and, by observing the movement of the piston, the operator can judge when to discontinue supply. <IMAGE>

Description

FILLER INJECTOR SUMMARY OF THE INVENTION The present invention relates to a kind of injector intended to fill,that is, to inject filler into the crevices, fissures present and to be patched up in the pillar, post, similar structures of a building. The invention device being essentially composed of interacting screwup components complementing each other, such that it is safe enough to rule out the possibility of structural breakdown, implosion or explosion when the filling is in progress, with the added advantage that a correct reading indicative of the pressure which accompanies the filler being injected into the crevices can be obtained by casting a glance at the scale as a function of the relative displacement of the piston defined in-between the inner tubing and outer tubing of the device.

BACKGROUND OF THE INVENTION A well known fact is that the reason that an RC structure can withstand considerable loading is answered by the interactive traction between adjoining bodies of RC, and between an RC structure and the skeleton ribs therein; it is to be noted, however, that in respect of such an RC structure, if it should yield to give occasion to the creation of crevices of fissures owing to an earthquake or a catastrophic event of comparable effects, the overall structural load will then converge, build up pressure onto these crevices, meantime exposure of the skeleton ribs as contained in the RC structure owing to these crevices will eventually result in rust-bound corrosion of the ribs due to contact with weathering elements, the air and precipitation, rainfall in particular, stress concentration owing to the afore-mentioned crevices and rib corrosion and constitute formidable threat to the structural safety features of the building in question.

Up to the present day, a general practice to take care of the structural crevices in a building is to inject sort of filler into the crevices with a view to reinforce the traction force of the crevice. The RC crevice is to be specific meantime endeavoring to block the skeleton rib from exposure to the atmospheric air and rain precipitations so as to prevent the rib from corrosion; said filler being filled into said crevices by an injector with the injection pressure being maintained at 5 Kg/cm , and the injection pressure will reverse and feed back to the same injector whenever the crevice recess is filled up in full with the incoming filler.Such a backfeeding pressure can very often give cause to skip-explosition of the rubber bond that is used in a conventional injector for the purpose as disclosed; another shortcoming with such a conventional execution is want of some expedient form of pressure scale which sould help to confirm whether said crevice in its entirety is filled full with the filler in use.

In view of the foregoing, therefore, the present invention is proposed by the inventor by taking into accounts years of expertise engineering experiences, for presentation in the form of an improved Filler Injector aimed primarily at the prevention of any skip-explosion owing to the backfeed of injection pressure, to take place at the joint, that which would undermine the entire filler patchup process.

Also, by providing a positioning scale indicative of the instantaneous position of the piston that is travelling between the inner tubing and the outer tubing as a function of the respondent pressure in the injector as the filling is in progress, it is possible to pass judgement as to whether the filler injected into the crevice has reached a prescribed saturation pressure, and that is another objective of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the invention will emerge as the description proceeds herein by reference to the accompanying drawings, in which Fig. 1 is a three-dimensional analytical perspective of the invention; Fig. 2 is a schematic view of the filler injection process according to the invention; and Fig. 3 is a diagrammatic schema of a conventional injector indicated for the same purpose as in the case of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to Fig. 3, a diagrammatic schema of a conventional injector (1) serving the same purpose as does the present invention, it is seen of a jacket (13) whose upper side is screwed to an injection nozzle (11), and whose lower side to a fastening cap (14), the cap (14) further sleeves in a rubber tube (15), longitudinall extensible and meant for extension outboard the cap (14), such that the rubber tube (15) is subjected to tighten up in-between as the jacket (13) is screwed up for engagement with the cap (14); also, the same procedure shall apply with respect to the other side of the same rubber tube (15) by compressing the fastening cap (14') and the jacket (13') altogether directed thereto, while the underside of the jacket (13') is screwed to a chassis (16).

To apply the afore-mentioned conventional device for operation, high-pressure filler is pumped into injector (1) via injection nozzle (11) and forced into the crevices of an ailing building by way of the jaacket (13), rubber tube (15), jacket (13') and chassis (16). Since in the course of the injection filling the crevice voids, once filled full with the filler, will react upon the filler being released and that results in pressure fed back to the injector. A check valve (12) is provided in the said injection nozzle (11) such that the backfeed pressure may expect being absorbed by the extensible rubble tube (15).This forcing the rubber tube to expand, so that, by studing the extent of expansion of the rubber tube (15), the operator may pass an judgement on whether the crevice has been filled up in full, or still, whether the closing pressure applied on the filler being released has reached prescribed level.

Execution of the filling procedure as disclosed in the foregoing paragraph will doubtless see the eventual expansion of the rubber tube (15), it is a pity to note, however, that as a result of the expansion, very signigicant tearing effects are rendered on portions tightened up by the jacket (13) (13') and fastening cap (14)(14'), in addition the very fact that rubber is an elastic substance can render the rubber tube (15) failing as a consequence of the skip-explosion of the compressed portion on both ends.

Another point deserving attention is that visual judgement passed by the operator basing on the extent of expansion of the rubber tube (15), as to whether the filler has been filled in full over the crevice or that the ultimate filling pressure has reached, is largely far from being accurate and to the point, visual inspection as such would thus foreseeably undermine the engineering quality of a crevice filling patchwork.

With such shortcomings inevitable with the execution of a conventional filler injection device in mind, I proceed with furhter description-in-detail of the invention improved device by referring specifically with reference to Fig. 1 and Fig. 2.

Structurally the invention injector (2) comprises an outer tubing (25), cylindrically configured and made of translucent steel of a given length, and of which the upper end is executed closed, with an inner tubing (23) of a smaller diameter but of a length slightly shorter than that of the outer tubing (25) inserted into the closed centre of the upper part of the outer tubing (25), the inner tubing (23) being positioned by insertion. into the mounting (231) on top; above both said inner tubing (23) and outer tubing (25) is furnished a high speed adaptor (21) meant for screwing engagement with the outer tubing (25) by means of a fastening cap (24) and in doing so compressing the mounting (231) for the inner tubing (23) therein; the underside of said outer tubing (25) is screwed to a chassis (26); a piston (27) and spring (28) are incorporated in the outer tubing (25) such that the diameter of the piston (27) is mathematically equal to the inner diameter of the outer tubing (25), with the inner tubing (23) functioning in the capacity of a guide rail to facilitate up-and-down movement of the piston (27) clinging to the inner tubing (23); spring (28) as provided in the enclosure defined by the upper side of said piston (27) in relation to the outer tubing (25) serves to maintain piston (27) in its startup; that is, passive position in the absence of any force acting thereupon.

For appreciation of the injection procedure according to the invention reference is made to Fig. 2, whereby it is seen that high-pressure filler incoming by way of high-speed joint (21) sourced to nozzle (211), is injected into the crevice of an object building via inner tubing (23) and chassis (26); similarly, the moment the crevice is filled in full with the incoming filler, the filler in turn will produce a back pressure upon the injector (2), since a check valve (22) is provided on the fast-speed adaptor (21), the back pressure will react to build an upward push against said piston (27) ;the piston in turn moves alongside the inner tubing (23) to a point of eventual equilibrium between the injection pressure and the spring (28).

The injection procedure as disclosed in the foregoing permits reading in sight og the instantaneous position of the moving piston (27) by reason of scale advantageously provided on the wall of the tran1&commat;nt outer tubing (25) that is made of translucent steel; that is, the invention permits forthright reading of the point of equilibrium to be arrived by both the acting pressure and the spring (28) by reason of its elasticity altogether, which permits reading and therefore passing of judgment as to whether the pressure owing to the filler being discharged into the crevice has reached a required level, thereby serving to safeguard the quality of the patchwork in question.

Parties enlightened by the foregoing will also appreciate that the invention, totally devoid of any elastic component, rubber, to be specific, in the ensemble, as opposed to conventional executions; but derives compaction results by thread-screwing effects instead, can better ensure safety feature relieving the constituent parts from skip-explosion once for all.

In summation, the present invention, by the provision of a piston which moves slidingly dependent upon the inner tubing that is furnished between the inner tubing and the outer tubing, makes possible the transmission of the piston, by the backfeeding pressure occasioned within the injector owing to the incoming filler, to a desired point of equilibrium whereat the injecting pressure is just offset by the responding spring, and henceforth makes possible the reading of a correct pressure value owing to the filler acting into the crevice, by referring to the scale equiped on the outer tubing. Moreover, it relieves all the constituent parts thereof from susceptibility to skip-explosion incidents despiting the presence of any backfed pressure emerging inside the invention injector since all the constituent parts are screw-threaded into position, All the very true advantages recited in the foregoing achievable according to the invention suffice to say that the present invention is a truly worthwhile piece of invention in the form of a highly improved filler over conventional executions for application in the treatment of crevices found in the pillars, posts, supports of building anywhere.

Claims

CLAIMS.

1. Filler Injection Assembly characteristically comprising: an inner tube of a smaller diameter but a shorter length than what is the case when compared to the outer tube, for insertion into the centre of the enclosed top of the outer tube, the inner tube being oriented by a mounting therefor on top; said outer tube being screw-coupled to a high speed adaptor on its top by a fastening cap, in doing so the mounting for the inner tube is compressed there-between; a piston of which the dimension is mathematically equal to the inner diameter of the outer tube and positioned inside said outer tube; spring seated on top of said piston which is slidably movable up-and-down and as clung to the inner tube which acts as a guide rail therefor.

2. A filler injection assembly substantially as hereinbefore described with reference to and as illustrated in the drawings.

3. Each and every novel feature, taken either singly or in any viable combination, of a filler injection assembly as described herein.

Amendments to the claims have been filed as follows

4. Filler Injection Assembly characteristically comprising: an inner tube of a smaller diameter but a shorter length than what is the case when compared to the outer tube, for insertion into the centre of the enclosed top of the outer tube, the inner tube being oriented by a mounting therefor on top; said outer tube being screwcoupled to a high speed adaptor on its top by a fastening cap, in doing so the mounting for the inner tube is compressed there-between; a piston of which the dimension is mathematically equal to the inner diameter of the outer tube and positioned inside said outer tube; spring seated on top of said piston which is slidably movable up-and-down and as clung to the inner tube which acts as a guide rail therefor.

5. A filler injection assembly substantially as hereinbefore described with reference to and as illustrated in the drawings.

6. Each and every novel feature, taken either singly or in any viable combination, of a filler injection assembly as described herein.

7. Filler injection assembly, comprising: an outer tube having an outlet for filler; an inner tube having an inlet for filler, the inner tube being shorter than the outer tube; a piston slidable in the outer tube and on the inner tube and biassed towards the outlet.

8. Filler injection assembly as claimed in claim 7, wherein the outer tube is translucent.

9. Filler assembly as claimed in claim 7 or claim 8, wherein the outer tube has an end which is closed apart from an aperture therethrough, the inner tube having a mounting at its inlet end and extending through the aperture in the end of the outer tube.

10. Filler injection assembly as claimed in claim 9, including an adaptor for connection to a supply of high pressure filler, the adaptor being coupled to the outer tube by a cap compressing the mounting for the inner tube between the outer tube and the adaptor.