US 3212269 A
Description (OCR text may contain errors)
Oct. 19, 1965 H. w. OLSEN GROUTED ANCHOR STRUCTURES 2 Sheets-Sheet 2 Filed March 1, 1962 INVENTOR Horace W. Olsen United States Patent 3,212,269 GROUTED ANCHOR STRUCTURES Horace W. Olsen, 2038 North Blvd., Houston, Tex. Filed Mar. 1, 1962, Ser. No. 176,526 1 Claim. (Cl. 6136) This invention relates to new and useful improvements in the art of earth engineering, and in particular, the invention concerns itself with the installation of cementitiously grouted anchors in cavities provided therefor in rock, earth or other terrestial formations, either above or below ground level.
The principal object of the inveniton is to provide a grouted anchor structure which is very easy to install, simple in construction, firm and rigid in use, and wherein the cavity grouting operation may be performed with convenience and expediency. Moreover, the arrangement of the invention is such that the cavity packing components may be quickly and easily removed from one cavity for installation of an anchor in another cavity, although the packing components may be permitted to remain with the installed anchor in one cavity, if so desired.
Other objects, features and advantages of the invention will become apparent from the following description taken in conjunction with the accompanying drawings, wherein like characters of reference are used to designate like parts, and wherein:
FIGURE 1 is a vertical elevational view showing a grouted anchor structure as being installed in a terrestial cavity, including means for delivering grouting material to the anchor;
FIGURE 2 is a side elevational view of the anchor structure per se on an enlarged scale;
FIGURE 3 is a sectional view, taken substantially in the plane of the line 3-3 in FIGURE 2;
FIGURE 4 is a sectional view, taken substantially in the plane of the line 44 in FIGURE 2;
FIGURE 5 is a sectional view, taken substantially in the plane of the line 55 in FIGURE 2;
FIGURE 6 is a sectional view, .taken substantially in the plane of the line 66 in FIGURE 3; and
FIGURE 7 is a fragmentary sectional view, taken substantially in the plane of the line 77 in FIGURE 2.
Referring now to the accompanying drawings in detail, the reference numeral 10 in FIGURE 1 generally designates a grouted anchor structure of the invention, being installed in a cavity 11 formed in rock, earth, or other terrestial stratum, either above or below ground level. The anchor structure 10 comprises a shaft-like anchor element or bolt 12 which is inserted into the cavity 11 so as to project outwardly therefrom. A conduit for grouting material, designated generally by the numeral 13, includes a tubular outer portion 14 and a hollow, convex-concave body portion 15, the latter being complemental and juxtaposed to the shaft-like element 12, as is best shown in FIGURES 3 and 4. As will be noted, the outer portion 14 of the conduit is divergent from the shaft-like element 12 and is provided with a cap 34, hereinafter again referred to.
A tubular, axially compressible and radially expansible packing sleeve 16 of resilient material such as rubber, or the like, is slidably positioned on and encircles the element 12 and juxtaposed portion of the conduit 13 and inner and outer pressure pads 17, 18, respectively, are provided at the respective inner and outer ends of the sleeve 16, and these pads as well as the sleeve are formed with longitudinal bores to accommodate a set of tie rods 19 and an air tube 20, the purpose of the latter being hereinafter more fully described. It will be observed that the tie rods 19 are equipped with heads 21 which abut the inner pressure pad 17, as shown.
Means are provided for axially compressing the packing sleeve 16, these means consisting of a substantially U-shaped plate 22 which straddles the element 12 in outwardly spaced relation from the outer pad 18 and is equipped with a pair of transversely spaced projections 23 having concave fulcrum seats 24 therein for a pair of transversely spaced, complemental rocker portions 25 provided at the ends of a substantially U-shaped lever 26. Intermediate regions of the side portions of the lever 26 are formed with protuberances 27 which operatively engage the outer pressure pad 18, while the bight portion of the lever 26 is formed with a recess 28 to engage a rounded end of an actuating screw 29 which passes through a screw-threaded bore 30 in the bight portion of the plate 22.
The lever 26 is provided with recesses 31 to afford clearance for the tie rods 19 and air tube 20, while the plate 22 is formed with notches 32 through which the rods 19 and tube 20 extend. The rods 19 are provided with screw-threaded end portions having nuts 33 thereon, whereby the various parts are held assembled. It will be readily apparent that when the screw 29 is tightened, the rocker portions 25 of the lever 26 will rock in the fulcrum seats 25 and the protuberances 27 on the lever 26 will urge the pressure pad 18 toward the pressure pad 17, thus axially compressing the packer sleeve 16 therebetween and causing the latter to expand radially against the wall of the cavity 11 in which the anchor element 12 is inserted. The expansion of the sleeve 16 is not only radially outwardly, but also radially inwardly, whereby the sleeve compressively engages the element 12 and juxtaposed portion 15 of the conduit 13, whereby to prevent the various parts from sliding along the shaft-like element 12.
The aforementioned cap 34, provided at the outer end of the portion 14 of the conduit 13, is formed with an axial bore or passage 35 which provides a seat 36 for a check valve 37 disposed in the conduit portion 14. The cap 34 is also equipped with suitable means 38 such as keys, or the like, for separably engaging a suitable coupling (not shown) at the end of a flexible hose 39, whereby grouting material in a supply hopper 40 may be delivered under pressure of a pump 41 driven by a motor 42, through the hose 39 and through the conduit 13 into the cavity 11 when the anchor structure 10 is installed in place. Possible back flow of the grouting material in the conduit 13 is prevented by the check valve 37 and any air trapped in the cavity 11, as indicated at 43, will be vented to the atmosphere through the tube 20, it being understood, of course, that the tube 20 is sufiicienly long to extend inwardly into the closed end portion of the cavity where the air is entrapped.
In the event that the presence of entrapped air in the cavity 11 is not objectionable, or is desirable from the standpoint of causing the grouting material to set quickly without shrinkage, the vent tube 20 may be omitted and another of the tie rods 19 substituted therefor.
The grouting material in the cavity 11 is indicated at 44 and when it is set, the various parts 16-18, 13, 22 and 26 may be removed from the anchor element 12 and applied to another anchor element to be installed in another cavity. Alternatively, the various aforementioned parts may be permitted to remain in place on the installed anchor element, as described.
While in the foregoing there has been described and shown the preferred embodiment of the invention, various modifications may become apparent to those skilled in the art to which the invention relates. Accordingly, it is not desired to limit the invention to this disclosure and various modifications and equivalents may be resorted to, falling within the spirit and scope of the invention as claimed.
What is claimed as new is:
In a grouted anchor structure, the combination of a shaft-like anchor element having a cylindrical side wall and adapted to be inserted into a cavity, a conduit for grouting material separate from said anchor element, said conduit including an elongated inner portion of a convexconcave cross-section having its concave side juxtaposed to and in complemental contact with the cylindrical side wall of said anchor element and also including a tubular outer portion angularly otfset from said element, an axially compressible and radially expansible cylindrical packing sleeve of resilient material provided with a single axial bore, said anchor element and said juxtaposed inner portion of said conduit extending through said bore of said sleeve, means for axially compressing and thereby radially expanding said sleeve both outwardly into sealing engagement with a cavity wall and inwardly to press said inner conduit portion against said anchor element, said means comprising inner and outer pressure pads abutting the respective inner and outer ends of the sleeve, a plurality of tie rods extending longitudinally through said sleeve and through said pressure pads, said tie rods having enlarged inner ends abutting the inner pressure pad to urge the same against the inner end of the sleeve, a substantially U-shaped plate straddling said anchor element in a plane spaced outwardly from the outer pressure pad, said tie rods passing through said plate and having enlarged outer ends at the outside of the plate to prevent movement of the latter outwardly from the outer pressure pad, a pair of transversely spaced fulcrum seats provided on one side of said plate, a substantially U-shaped lever interposed between said plate and said outer pressure pad, said lever including a bight portion and a pair of arms straddling said anchor element, said arms terminating in rocker ends engaging said fulcum seats, said arms having a pair of protuberances engaging said outer pressure pad at diameterically opposite sides of said anchor element, and an actuating screw provided on the side of said plate opposite from said fulcrum seats, said screw bearing against the bight portion of said lever whereby to axially compress said sleeve between said pressure pads when the screw is tightened.
References Cited by the Examiner UNITED STATES PATENTS 2,158,829 5/34 Miller 285-338 2,152,429 3/39 Cave. 2,313,109 3/43 Wertz 6136 2,667,037 1/54 Thomas 6145 2,960,831 11/60 Lonaberger 6l-36 FOREIGN PATENTS 664,709 1/52 Great Britain.
84,937 1/ Norway. 84,938 1/55 Norway.
EARL I. WITMER, Primary Examiner.
JACOB L. NACKENOFF, Examiner.