US 3667720 A
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Description (OCR text may contain errors)
June 6, 1972 3,667,720
I. WILLIAMS TIE HOD CON TION FOR SEALI THE THREADED END OF A SHEB F d Sept. 22, 1969 I NVENTOR.
Chesier I. Williams BY ATTORNEY United States Patent Ofice 3,667,720 Patented June 6, 1972 US. Cl. 249-213 4 Claims ABSTRACT OF THE DISCLOSURE The interior threading on the inner end of a shebolt installed in a wall-form tie system is sealed against the ingress of concrete by the presence of an annular ring adjacent the inner extremity of the threading at the ends of the inner tie rod. The sealing ring is deformable, and operates preferably in conjunction with a positive stop arrangement engageable with the end of the tie rod.
CROSS-REFERENCE A co-pending application Ser. No. 751,313, filed by applicant on Aug. 8, 1968, describes and claims spacing inserts in the ends of shebolts, and engageable with the ends of inner tie rods to establish a spacing relationship between associated wall form panels.
BACKGROUND OF THE INVENTION Forms used to confine poured concrete are commonly held in position against the tremendous forces involved by ties or anchors traversing the concrete, and engaging bolts which transfer the securing forces to the form panels through bearing brackets. Where spaced form systems are held in place to define a wall, it is the usual practice to extend an inner tie rod partially across the space between the form panels, and to engage the opposite ends of these tie rods with the bolts associated with each of the form systems. The inner tie rods remain embedded in the concrete, but the bolts are removed after the concrete is set, and reused in later installations.
The reuse of the bolts is often interfered with by the presence of concrete that has Worked its way into the interior threading at the inner end, at the point of engagement with the inner tie rod. The liquid pressures of the newlypoured concrete are tremendous, and will force liquids and small particles through surprisingly small openings. Normal threaded engagement is not sufliciently close to provide a barrier against the liquid inflow, and any tendency for the bore containing the interior threading to fill up with concrete around the end of the tie rod will seriously interfere with the reuse of the shebolt. Particles of set concrete will tend to work loose and interfere with the interengagement of the threading when the shebolt is applied to a subsequent tie rod, which seriously interferes with the form spacing. My US. Pat. No. 3,405,904 utilizes an annular ridge engageable with the end of the tie rod as an abutment to determine form spacing, but this arrangement does not provide a sufiicient seal at the entrance of the threaded opening in the shebolt because of the possibilities of various forms of misalignment. Auxiliary sealing arrangements such as O-rings are too expensive for use in these applications.
SUMMARY OF THE INVENTION The present invention provides an annular ridge adjacent the inner end of the threading at each of the ends of the inner tie rod. This ridge is deformable under forces that can be generated by tightening the shebolt on the inner tie rod, which is to say that the axial thickness of the ridge must have a relationship to the cross-section of the inner tie rod such that sufficient torque can be generated to induce at least a slight deformity of the annular ridge as it engages the end of the shebolt. The shebolt is preferably counterbored to eliminate a projection that seems to inevitably accompany the beginning of the interior threading, and which is caused by the entrance of the tap during the thread-cutting operation. The provision of the counterbore maintains the inner end of the shebolt in a plane perpendicular to the shebolt axis, without the local distortion that would otherwise be present. The
annular sealing ridge can either accommodate itself to a transverse face at the end of the shebolt, or may enter into the counterbore in a forced-fit arrangement. The ridge may also abut the transverse face defined by the base of the counterbore, if desired. The sealing arrangement is preferably used in conjunction with an interior abutment installed in the shebolt for engagement with the end of the tie rod to positively determine the form spacing. In this combination, it is apparent that the spacing between the ridge and a transverse end wall at the end of the tie rod will be slightly exceeded by the spacing between the interior abutment and the transverse end face on the shebolt against which the ridge abuts. The deformability of the sealing ridge removes any interference with the functioning of the spacing stop.
DESCRIPTION OF THE DRAWING In the drawing:
FIG. 1 is a perspective view showing a typical wallform tie installation.
FIG. 2 is a sectional view on an enlarged scale over FIG. 1, showing one modification of the invention, in which the sealing ridge enters into the shebolt counterbore.
FIG. 3 illustrates a further modification of the invention in which the sealing ridge abuts the inner end of the shebolt.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The spaced form systems 10 and 11 are of standard construction. Each of these includes a plywood panel 12-13 stifiened by vertical studs 14 and 15, which are spaced along the form panels at regular intervals. Horizontal pairs of walers 1647 and 18-19 extend across the vertical studs to transfer forces from the tie system.
The tie system shown in FIG. 1 is repeated across the area defined by the form systems in a pattern having a density sufficient to resist the forces involved. This density will be determined by the depth of the pour of cancrete, as this will determine the pressure forces involved. The patterns density of the tie systems will be interrelated with the cross-sectional area of the inner tie rod 20' to produce a required degree of security. The tie rod 20 is preferably offset slightly at 20a to inhibit rotation within the concrete as the shebolts are disengaged after the concrete has set, and thus maintain the sealed relationship between the rod and the concrete. The opposite ends of the inner tie rod 20' are threaded for engagement with interior threading normally provided at the inner extremities of the shebolts 21 and 22. The outer portions of the shebolts traverse the space between the Waler pairs 16-17 and 18-19; and the pressure from the poured concrete is resisted by the transfer of forces from the shebolts to the walers by the wedges 23 and 24, which engage with shoulders on the shebolts in a conventional manner. The forms may be positioned prior to the pouring of concrete by the so-called hairpin spacers 25 and 26, which engage the inner faces of the walers. A light temporary nailing of the walers 16-17 and 18-19 to the studs 14 and 15, respectively, will result in maintenance of proper form spacing prior to the pouring of the concrete. This spacing will be controlled primarily by the depth of the threaded 3 interengagement between the ends of the tie rod 20 and the shebolts.
Referring to FIGS. 2 and 3, the inner ties 20* and 27 are provided with an annular ridge at 28 and 29, which is preferably rolled in the same operation that produces the threading 30 and 31, respectively. In FIG. 2, the ridge 28 enters into the counterbore provided at the inner end of the shebolt 21, and abuts against the base of the counterbore in sealing engagement. It is preferable that this system be used in conjunction with the spacing insert 32, which is installed in the shebolt 21 for engagement with the end of the tie rod 20 as a positive stop. The axial thickness of the ridge 28 is such as to permit deformity of an outer peripheral portion of the ridge in relation to an inner annular portion thereof immediately adjacent the integral merger of the ridge with the tie rod on engagement with a transverse surface on the shebolt, as the bolt and tie rod are tightened to bring the stop insert 32 into engagement. In FIG. 3, the sealing ridge 29 has only partially entered the counterbore 33 in the shebolt 34, abutting primarily against the inner face of the shebolt. Sufficient deformity can be applied to the ring to assure the engagement of the spacing stop 35 with the outer end of the tie 27.
1. A tie system for securing spaced wall forms with respect to each other, said system including an inner tie rod provided with threaded ends terminating in transverse end walls; a pair of elongate shebolts normally secured to and traversing spaced wall forms, respectively; each said shebolt including, adjacent an inner end thereof, a transverse end face and including a threaded bore extending longitudinally thereof from said end face and threadedly engaging a threaded end of said tie rod; spacing stop means fixedly positioned within the bore of each said shebolt in spaced relation to the end face thereof for limiting the axial movement of a threaded end of said tie rod coaxially of said threaded bore to an axial distance equal to the spacing between said end face and stop means; wherein the improvement comprises: a deformable annular ridge on said tie rod adjacent each said threaded end; each said annular ridge including an inner annular portion integral with said tie rod and an outer peripheral portion whose diameter exceeds the inner diameter of said threaded bore; and said inner annular portion of each said ridge being axially spaced from the adjacent end wall on said tie rod a distance just exceeded by the spacing between said spacing stop means and end face of the associated shebolt; each said annular ridge having an axial thickness so related to the cross section of said tie rod that said ridge is deformable by an associated shebolt on tightening the threaded engagement thereof whereby threaded engagement of each said shebolt with an associated end of said tie rod to engage said stop means with the associated tie rod end wall results in deformation of the outer peripheral portion of a ridge against an associated shebolt end face to seal the threaded bore.
2. The tie system of claim 1 wherein said transverse end face on each said shebolt is spaced axially of said threaded bore from the inner end of said shebolt.
3. A tie system for securing spaced wall forms with respect to each other comprising; a pair of elongate shebolts normally secured to and traversing spaced wall forms, respectively; each said shebolt including adjacent an inner end thereof, a transverse end face and including a threaded bore extending longitudinally thereof from said end face; an inner tie rod provided with threaded ends and a deformable annular ridge adjacent each said threaded end; each said annular ridge having an axial thickness so related to the cross section of said tie rod that said ridge is deformable by an associated shebolt on tightening the threaded engagement thereof; each said annular ridge including an inner annular portion integral with said tie rod and an outer peripheral portion whose diameter exceeds the inner diameter of said threaded bore; said shebolts threadedly engaging the ends of said tie rod and in abutting engagement with said deformable ridges; and at least a portion of said outer peripheral portions of each said deformable ridge being deformed inwardly with respect to said inner annular portion thereof and in sealing relationship with said threaded bore.
4. The tie system of claim 3 wherein said transverse end face on each said shebolt is spaced axially of said threaded bore from the inner end of said shebolt.
References Cited UNITED STATES PATENTS 2,001,052 5/1935 Colt 249-42 X 2,161,379 6/1939 Neptune 249-190 2,270,448 l/l942 Juhl 249-213 X 2,281,833 5/1942 De Canio 249-217 3,239,233 3/1966 Stillwagon, Jr 287- X 3,405,904 10/1968 Williams 249-213 X 3,437,306 4/1969 Gates 249-43 3,437,309 4/ 1969 Tausanovitch 249-43 X 3,490,730 1/1970 Gates, Jr 249-216 X 1,680,923 8/ 1928 Williams 249-42 FOREIGN PATENTS 927,647 1963 Great Britain 249-42 H. A. KILBY, JR., \Primary Examiner US. Cl. X.R. 249-42