EP0541860B1 - Procédé de fabrication de boulons - Google Patents
Procédé de fabrication de boulons Download PDFInfo
- Publication number
- EP0541860B1 EP0541860B1 EP19910310397 EP91310397A EP0541860B1 EP 0541860 B1 EP0541860 B1 EP 0541860B1 EP 19910310397 EP19910310397 EP 19910310397 EP 91310397 A EP91310397 A EP 91310397A EP 0541860 B1 EP0541860 B1 EP 0541860B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rod
- thread
- bolt
- hole
- threads
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/06—Tying means; Spacers ; Devices for extracting or inserting wall ties
- E04G17/065—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning
- E04G17/0655—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning the element consisting of several parts
- E04G17/0658—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning the element consisting of several parts remaining completely or partially embedded in the cast material
Definitions
- This invention relates to bolts employed in formwork and in particular to bolts employed to connect a structural formwork member to a rod.
- One type of bolt which is commonly used in formwork has a first end formed with an internal threaded hole and a second end formed with an external thread.
- the bolt can be passed through a structural member and be secured at its first end to a rod which is threaded along its length, or at least at its ends, by screwing an end of the rod into the first end of the bolt.
- a nut can be mounted on the second end of the bolt to hold it in the structural member. If the free end of the rod is secured, for example, connected to another such bolt positioned through a second structural member, then the first structural member can be pulled towards the rod by tightening up the nut.
- This type of bolt is commonly known as a "she bolt”.
- One known method of forming a she bolt is simply to blind tap a threaded hole in one end of a section of rod and tap an external thread into the other end.
- the problem with this method is that blind tapping only allows production of small pitch threads on the internal hole.
- she bolts formed by this method cannot be employed with large pitch threaded rods.
- two rods are prepared in the same way as in the first suggested method but are connected by friction welding.
- the problem with this is that it has been found that whilst the connection is stronger than that produced by crimping, there is still a tendency for the two rods to separate on withdrawal of the she bolt.
- US Patent 1938153 describes a tie rod comprising a centre rod connected at either end to two outer rods by sleeves.
- Each sleeve has, at a first end thereof, a first right hand threaded orifice for connection to right hand threads on the centre rod and, at a second end thereof, a second left hand threaded orifice for connection to left hand threaded end of one of the outer rods.
- An annular shoulder formation is provided in each sleeve between the two orifices.
- a method of forming a bolt of the type having one end formed with a threaded hole and the other end formed with an external thread comprises forming a hole through the length of a first rod, tapping the hole with a first thread at one end and a second thread at the other end of the first rod, forming an external third thread on at least a first end portion of a second rod and connecting the rods by screwing the first end portion of the second rod into the said other end of the first rod, the hand of the threads on the rods being so arranged that unscrewing of the said one end of the first rod from a member to which the bolt is attached will tend to tighten up the connection between the two rods, characterised in that the first and second threads are formed by tapping the whole hole with the first thread and double tapping the said other end of the first rod to form the second thread therein, and in that the first thread is a large pitch thread.
- a bolt formed by this method is capable of use with any type of threaded rod no matter what the pitch of the threads is.
- the method only requires a single hole foming operation on the first rod. Furthermore it will not separate into its two constituent parts when withdrawn from the edges of a wall. Instead, the connection between the two parts will be tightened by withdrawal of the bolt.
- the bolt has been found to work extremely well in practice.
- the second end of the second rod may be formed with a fourth thread, the pitch of the fourth being larger than that of the third.
- the hand of the fourth thread may be the same as that of the first thread.
- the first rod is tapered from the end connected to the second rod to the free end thereof. This facilitates removal of the bolt from a formwork arrangement.
- the end portion of the second rod may also be tapered to give a longer "nose” and further facilitate removal of the bolt.
- the extreme end of the threaded end of the second rod is machined into a square to provide a grip surface for a spanner, again to facilitate removal of the bolt from a formwork arrangement.
- the bolt 2 comprises two interconnected parts 4 and 6 each of which basically comprises a rod.
- the rod 4 is tapered from the end connected to the rod 6 to its free end and has an internal hole 8 which extends through the length thereof.
- the hole 8 is threaded, the thread 10 at the free end of the rod 4 being a large pitch thread, for example, a Dividag thread, and the thread 12 at the connected end of the rod 4 being a small pitch thread of the opposite hand to the thread 10.
- the rod 6 consists of three sections 14, 16 and 18.
- the first section 14 has a diameter approximately equal to that of hole 8 and is formed with an external thread 20 of the same pitch and hand as the internal thread 12 at the connected end of the rod 4.
- the second section 16 has a diameter equal to that of the connected end of the rod 4 and is formed with an external thread 22 whose pitch is greater than, and of opposite hand to, thread 20.
- the thread 22 extends along the section 16 from the free end of the rod 6 for a portion of the length thereof.
- the third section 18 is at the extremity of the free end of rod 6 and is machined to form a square whereby it may be gripped by a spanner.
- a hexagonal nut 24 is provided for the bolt 2 and a waler plate 26 may also be screwed onto the threaded end of the second rod 6.
- the bolt 2 is manufactured by, firstly, drilling the hole 8 along the length of rod 4.
- the large pitch thread 10 is then tapped along the whole length of the hole 8.
- the hole 8, at the end of the rod 4 which will be connected to the second rod 6, is then re-tapped with finer pitch thread 12.
- a second rod is then appropriately turned and machined to give the three sections 14, 16 and 18 whereafter external thread 20, of the same pitch and hand, to internal thread 12, is formed on the first portion 14 and external thread 22, which may be relatively coarse, is formed on the second portion 16.
- the two rods are then connected by screwing the portion 14 of rod 6 into the end of hole 8 with fine pitch thread 12.
- the assembled unit may then be machined to taper the bolt from the free end of rod 4.
- the rod 4 may solely be tapered or, to provide a longer nose, the rod 4 and part of the rod 6 can be tapered. Alternatively, this tapering can be carried out as part of the original preparation of the rods 4 and 6 prior to their connection.
- both rods 4 and 6 can be prepared completely separately and no further operations have to be carried on the bolt 2 once this is formed by screwing the two rods 4 and 6 together.
- the two-part form of the bolt 2 makes it possible to provide the large pitch internal thread 10 since this is formed by tapping along a complete hole rather than having to blind tap a hole, the latter operation with a large pitch thread being very difficult, if not impossible.
- Figure 4 illustrates one use of the bolt 2.
- a wall is to be formed in the region 28 between two panels 30, each panel being supported by structural members 32, for example soldiers, and bracing members 34.
- a bolt 2 is passed through each structural member 32 and its associated panel 30 and a threaded rod 36 is connected between the bolts 2 by screwing its ends into free ends of the bolts 2.
- the connection is tightened up by turning the nuts 24 on the bolts 2 which forces the waler plates 26 hard against the structural members 30 and thus pulls the structural members 34 closer together. Concrete or other building material is then filled into the region 28 around the rod 36. Once this is set, the bolts 2 are withdrawn by applying a spanner to their square ends 18 and turning this to cause the bolts 2 to unscrew from the rod 36.
- the bolt 2 can be employed with any rod, no matter what the pitch of the thread is on it, the method of manufacture allowing production of a bolt with any required size internal hole thread. It is strong and does not break on withdrawal from a wall or other structure.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Joining Of Building Structures In Genera (AREA)
Claims (7)
- Procédé de fabrication d'une vis (2) ayant une extrémité formée par un pas taraudé (10) et l'autre extrémité formée par un filetage mâle (22), comprenant la formation d'un trou (8) à travers la longueur d'une première tige (4), le perçage du trou (8) à l'aide du pas (10) à une extrémité et le second pas (12) à l'autre extrémité de la première tige (4), la formation d'un troisième filetage mâle (20) sur au moins la première partie de l'extrémité (14) d'une seconde tige (6) et la connexion des tiges (4,6) en vissant la première partie de l'extrémité (14) de la seconde tige (6) dans ladite autre extrémité de la première tige (4), le filet des pas (10, 12, 20) sur les tiges (4,6) étant disposé de sorte que le fait de dévisser ladite extrémité de la première tige (4) à partir d'un élément (36) auquel la vis (2) est attachée tendra à maintenir fortement le raccord entre les deux vis (4,6), caractérisé en ce que le premier et le second pas (10,12) sont formés en perçant le trou (8) à l'aide du premier pas (10) et en perçant doublement ladite autre extrémité de la première tige (4) pour y former le second pas (12), et en ce que le premier pas (10) a un large écartement.
- Procédé selon la revendication 1 dans lequel une seconde partie de l'extrémité (16) de la seconde tige (6), à l'extrémité opposée de la première partie d'extrémité (14), est formée à l'aide d'un quatrième pas externe (22).
- Procédé selon la revendication 2 dans lequel le premier et le quatrième pas (10,22) ont le même écartement.
- Procédé selon n'importe laquelle des revendications précédentes dans lequel le second et le troisième pas (12,20), ont un écartement étroit.
- Vis (2) directement obtenue par le procédé selon n'importe laquelle des revendications 1 à 4.
- Vis (2) selon la revendication 5 dans laquelle la seconde tige (6) comprend trois sections; une première section (14) consistant en une première partie de son extrémité; une seconde section (16) comprenant la seconde partie de son extrémité et ayant un diamètre égal à celui de la première tige (4) à ladite autre extrémité, et une troisième section (18) formant l'ultime seconde extrémité de la seconde tige (6) et ayant une coupe transversale carrée.
- Vis (2) selon la revendication 6 dans laquelle la première tige (4) est tronconique à son extrémité.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19910310397 EP0541860B1 (fr) | 1991-11-11 | 1991-11-11 | Procédé de fabrication de boulons |
ES91310397T ES2099739T3 (es) | 1991-11-11 | 1991-11-11 | Metodo de formacion de pernos. |
DE1991624245 DE69124245T2 (de) | 1991-11-11 | 1991-11-11 | Herstellung von Bolzen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19910310397 EP0541860B1 (fr) | 1991-11-11 | 1991-11-11 | Procédé de fabrication de boulons |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0541860A1 EP0541860A1 (fr) | 1993-05-19 |
EP0541860B1 true EP0541860B1 (fr) | 1997-01-15 |
Family
ID=8208461
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19910310397 Expired - Lifetime EP0541860B1 (fr) | 1991-11-11 | 1991-11-11 | Procédé de fabrication de boulons |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0541860B1 (fr) |
DE (1) | DE69124245T2 (fr) |
ES (1) | ES2099739T3 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105485124A (zh) * | 2014-09-29 | 2016-04-13 | 华为技术有限公司 | 螺杆、连接器组件及网络设备 |
US10377029B2 (en) * | 2016-11-08 | 2019-08-13 | Caterpillar Inc. | Hammer sideplate tightening mechanism |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1938153A (en) * | 1931-03-30 | 1933-12-05 | Lerritt A Reeves | Tie-rod for concrete construction |
US3613216A (en) * | 1967-06-05 | 1971-10-19 | Chester I Williams | Method for securing forms from a position of safety |
-
1991
- 1991-11-11 ES ES91310397T patent/ES2099739T3/es not_active Expired - Lifetime
- 1991-11-11 DE DE1991624245 patent/DE69124245T2/de not_active Expired - Fee Related
- 1991-11-11 EP EP19910310397 patent/EP0541860B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2099739T3 (es) | 1997-06-01 |
DE69124245T2 (de) | 1997-07-31 |
DE69124245D1 (de) | 1997-02-27 |
EP0541860A1 (fr) | 1993-05-19 |
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