US3859802A - Gasketed watertight segmented tunnel linings - Google Patents
Gasketed watertight segmented tunnel linings Download PDFInfo
- Publication number
- US3859802A US3859802A US371915A US37191573A US3859802A US 3859802 A US3859802 A US 3859802A US 371915 A US371915 A US 371915A US 37191573 A US37191573 A US 37191573A US 3859802 A US3859802 A US 3859802A
- Authority
- US
- United States
- Prior art keywords
- gasket
- flanges
- bolts
- end plates
- plane surfaces
- 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
Links
- 239000002184 metal Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 206010023230 Joint stiffness Diseases 0.000 claims abstract description 8
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 4
- 230000002265 prevention Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 101100518501 Mus musculus Spp1 gene Proteins 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
- E21D11/385—Sealing means positioned between adjacent lining members
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
Definitions
- Prior Art Primary tunnel linings have in the past been constructed with arcuate segments formed from rolled channels in which the flanges extend in toward the tunnel interior, and end plates are welded between the flanges.
- An annular tunnel portion is made by bolting together, to form longitudinal joints, the corresponding end plates on adjacent segments.
- the length of the tunnel is increased by bolting together, to form circumferential joints, the corresponding flanges on adjacent segments.
- the bolted longitudinal and circumferential joints should exhibit metal-to-metal contact between the jointed flanges and end plates of adjacent segments. This configuration does not prevent water or air leaks.
- the dimensions of the rolled channels normally vary due to wear of rolls in the rolling mill. This dimensional variance can cause misalignment of adjacent segments, and increases the possibility of leaks.
- FIG. I shows an annular tunnel portion made from four arcuate segments plus one key segment bolted together.
- FIG. 2 shows a perspective view of two adjacent segments bolted together.
- FIG. 3 is a view taken along 33 of FIG. 2.
- FIG. 4 is a view taken along 4-4 of FIG. 2.
- FIG. 1 shows an annular tunnel portion 1 comprised of four arcuate segments 3 plus one key segment 5 bolted together, as is well known in the art.
- FIG. 2 shows segment 3 made with rolled channels 7.
- Each channel 7 has a web portion '9 and flanges II and 11 which extend toward the interior of the tunnel.
- segment 3 a double channel segment by welding two rolled channels together at flanges II and II.
- segment 3 a double channel segment. fewer bolted joints are required in actual tunnel construction.
- the double channel segment is optional and a single channel will serve as well.
- End plates 15 and 15 are welded across channels 7 between flanges II and 11, as is well known in the art.
- Stiffeners 17 are welded between flanges l1 and 11' at appropriate intervals, as is also well known.
- a longitudinal joint 19 is made by joining together with high strength bolts 21 and nuts 21 corresponding end plates 15 and 15' of adjoining segments.
- a circumferential joint 23 is made by bolting together, with high strength bolts 25 and nuts 25', corresponding flanges 11 and 1] of adjacent segments 7.
- FIG. 3 shows a circumferential joint 23.
- Flanges 11 and 11 are bolted together with high strength bolts 25 and nuts 25.
- Gasket 29 is located outside of bolts 25 adjacent the outer end of flanges l1 and 11.
- FIG. 1 also shows the location of gasket 29 on flange 11'. Gasket 29 can compensate for slight misalignment of segments 7 and helps make joint 23 waterproof. Because gasket 29 is subject to high compressive loads, due to bolts 25 and subsequentjacking forces, selection of the gasket material is important. We prefer a neoprene having a durometer less than 39 and a tensile strength in excess of 2,000 pounds per square inch.
- the gasket material exhibit low creep, also referred to as compression set.
- creep is measured by compressing an elastic specimen by twenty five percent of its original thickness. After the specimen is released, the amount that it fails to return to its original dimension, expressed as per cent, is a measure of the creep characteristics.
- the gasket material of the invention For evaluating the gasket material of the invention, a more severe test was employed, in which the specimen was compressed by seventy five percent rather than the usual twenty five percent. Under a seventy five percent compression test, the preferred gasket material exhibited less than ten percent set, or creep.
- NAAMM Standard SG-1-70 Materials, referred to as NAAMM Standard SG-1-70.
- Gasket 29 can be attached with suitable adhesive to flange 11' prior to shipment, so gasket 29 is properly positioned.
- Bolt 25 is of the high strength type well known in the art, and is tightened enough to cause joint 23 to be a friction joint. In a friction joint, stiffness of joint 23 is enhanced due to friction between opposed plane surface 26 and 27.
- Flanges 11 and 11 are deformed due to tightening of bolt 25 and joint 23 derives stiffness from the metal-tometal contact between the opposed plane surfaces 26 and 27 of flanges 11 and 11' in the area of the bolt 25 on into the inner end of flanges 11 and 11.
- FIG. 4 shows a longitudinal joint 19. Endplates l5 and are welded to web 9. End plates 15 and 15 are joined with high strength bolt 21 and nut 21'. Positioned between and in contact with opposed plane surfaces 31 and 32 of end plates 15 and 15' is gasket 33 of the same material as the gasket 29. Gasket 33 is located toward the outside of bolt 21 adjacent the outer end of end plates 15 and 15. Gasket 33 is fastened to end plate 15 in the same manner as gasket 29 is attached to flange 11.
- End plates 15 and 15 are deformed by high strength bolt 21 and nut 21, and joint 19 derives stiffness from the metal-to-metal contact between opposed plane surfaces 31 and 32 in the area of the bolt 21 on into the inner end of end plate 15 and 15'.
- Each segment 3 was a double channel segment made by welding together at corresponding flanges flanges 11 and 11 two single channel segments are previously described.
- Each rolled channel 7 was made from A.S.T.M. A-36 steel and was a miscellaneous channel 18 inches wide with flanges 11 and 11 4 inches high with a weight per foot of 42.7 pounds. Sections 7 were bent to a 60 inch radius. End plates 15 and 15 were /1 inch thick steel plate A.S.T.M. A-36.
- Bolts 21 and 25 were inch diameter A.S.T.M. A 325 in 1 inch diameter drilled holes on about 12 inch centers, spaced about 2% inches from the outside surface.
- Gaskets 29 and 33 were one-half inch wide X onefourth inch thick of neoprene satisfying specification NAAMM Standard SG-lhaving a durometer less than 39 and a tensile strength in excess of 2,000 psi.
- a gasket positioned between and in contact with said plane surfaces of said flanges and extending only over a portion of said surfaces adjacent the outer end of said flanges for sealing;
- gasket is a neoprene having a durometer less than 39 and a tensile strength in excess of 2,000 psi.
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US371915A US3859802A (en) | 1973-06-20 | 1973-06-20 | Gasketed watertight segmented tunnel linings |
CA202,111A CA1005654A (en) | 1973-06-20 | 1974-06-11 | Gasketed watertight segmented tunnel linings |
DE2428936A DE2428936A1 (de) | 1973-06-20 | 1974-06-15 | Tunnelauskleidung |
JP49069617A JPS5052827A (enrdf_load_stackoverflow) | 1973-06-20 | 1974-06-18 | |
FR7421522A FR2234452A1 (enrdf_load_stackoverflow) | 1973-06-20 | 1974-06-20 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US371915A US3859802A (en) | 1973-06-20 | 1973-06-20 | Gasketed watertight segmented tunnel linings |
Publications (1)
Publication Number | Publication Date |
---|---|
US3859802A true US3859802A (en) | 1975-01-14 |
Family
ID=23465944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US371915A Expired - Lifetime US3859802A (en) | 1973-06-20 | 1973-06-20 | Gasketed watertight segmented tunnel linings |
Country Status (5)
Country | Link |
---|---|
US (1) | US3859802A (enrdf_load_stackoverflow) |
JP (1) | JPS5052827A (enrdf_load_stackoverflow) |
CA (1) | CA1005654A (enrdf_load_stackoverflow) |
DE (1) | DE2428936A1 (enrdf_load_stackoverflow) |
FR (1) | FR2234452A1 (enrdf_load_stackoverflow) |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3996752A (en) * | 1974-03-22 | 1976-12-14 | Pont-A-Mousson S.A. | Casing panel |
US4459063A (en) * | 1980-08-07 | 1984-07-10 | Shaw Christopher B | Building construction |
US4621948A (en) * | 1983-11-23 | 1986-11-11 | Hochtief Ag Vorm. Gebruder Helfmann | Tunnel lining form |
US4621951A (en) * | 1983-08-02 | 1986-11-11 | Dewson Frederick J | Modular reusable overcast |
US5366318A (en) * | 1990-07-18 | 1994-11-22 | Environ Products, Inc. | Sump assembly |
US5810400A (en) * | 1996-07-11 | 1998-09-22 | Advanced Polymer Technology, Inc. | Flexible entry boot |
US5967567A (en) * | 1998-01-15 | 1999-10-19 | Advanced Polymer Technology, Inc. | Matingly engaged flexible entry boot |
US6086117A (en) * | 1998-05-05 | 2000-07-11 | Advanced Polymer Technology, Inc. | Double booted flexible entry boot |
USD429735S (en) * | 1998-07-23 | 2000-08-22 | Advanced Polymer Technology, Inc. | Integrally formed tank sump with lid |
US6173997B1 (en) | 1996-07-11 | 2001-01-16 | Advanced Polymer Technology, Inc. | Flexible entry boot |
US6189717B1 (en) | 1998-09-14 | 2001-02-20 | Advanced Polymer Technology, Inc. | Integrally formed tank sump with water resistant lid assembly |
US7056064B2 (en) * | 2002-01-23 | 2006-06-06 | Shonan Gosei-Joshi Seisakusho K.K. | Block unit for repairing flow passage facilities and method of repairing flow passage facilities |
US20080054625A1 (en) * | 2004-09-10 | 2008-03-06 | Shonan Gosei-Jushi Seisakusho K.K. | Rehabilitating Pipe for Repairing Pipeline Facilities and Method for Repairing Pipeline Facilities Using Rehabilitating Pipe |
AU2003221369C1 (en) * | 2002-07-24 | 2008-04-24 | Shonan Gosei-Jushi Seisakusho K.K. | Block unit for repairing flow passage facilities and method of repairing flow passage facilities |
US20080267731A1 (en) * | 2003-11-03 | 2008-10-30 | Anatoly Efremov | Bolted flanged connection on a basis of shape memory effect and inverse flexion flange design |
US20110136423A1 (en) * | 2009-12-04 | 2011-06-09 | Qun Xia | Large Diameter FRP Flues In Large Diameter Chimneys |
US20110188939A1 (en) * | 2010-02-04 | 2011-08-04 | Sanders Darrell J | Mine shaft liner plate system and method |
CN101672187B (zh) * | 2009-08-13 | 2012-05-30 | 重庆市十八土鑫诚灌浆防水工程有限公司 | 一种防渗水处理方法 |
US20140097612A1 (en) * | 2012-10-10 | 2014-04-10 | Shonan Gosei-Jushi Seisakusho K.K. | Rehabilitation pipe and pipe rehabilitation method |
US20140305066A1 (en) * | 2011-08-12 | 2014-10-16 | Atlantic Industries Limited | Corrugated Metal Plate and Overhead Structure Incorporating Same |
CN105422129A (zh) * | 2015-12-21 | 2016-03-23 | 南京联众建设工程技术有限公司 | 用于组合式隧道衬砌、涵洞或综合管廊的拼接结构 |
CN105626098A (zh) * | 2015-12-21 | 2016-06-01 | 南京联众建设工程技术有限公司 | 组合式隧道衬砌、涵洞或地下综合管廊 |
US10443381B2 (en) | 2015-05-28 | 2019-10-15 | Gms Mine Repair And Maintenance, Inc. | Adjustable mine ventilation system and method |
US11713554B2 (en) * | 2019-03-25 | 2023-08-01 | Kirby W. Isaac | Apparatus for removable insertion into an excavated trench to protect worker against collapse of trench wall |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2927040C2 (de) * | 1979-07-04 | 1984-03-01 | Rudolf 4100 Duisburg Schaefer | Hohlkörper aus Elementen |
FR2559542B1 (fr) * | 1984-02-15 | 1986-05-16 | Pont A Mousson | Voussoir de cuvelage en fonte et assemblage etanche en comportant application |
DE3628607A1 (de) * | 1986-08-22 | 1988-02-25 | Wayss & Freytag Ag | Verfahren zum herstellen von grossflaechigen aussparungen im tuebbingausbau von tunnel- oder schachtroehren und vorrichtung zur durchfuehrung des verfahrens |
ES2330397B1 (es) * | 2006-09-27 | 2010-09-17 | Aldesa Construcciones, S.A. | Dispositivo de colocacion de sectores de sustentacion de tuneles para tuneladora y sector de sustentacion para uso con dicho dispositivo. |
JP7543164B2 (ja) * | 2021-02-22 | 2024-09-02 | Jfe建材株式会社 | 土留構造物 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US837767A (en) * | 1906-06-15 | 1906-12-04 | Walton I Aims | Moisture-proof joint. |
US935376A (en) * | 1909-03-20 | 1909-09-28 | Alfred Lennon | Air and water tight joint for tunnels and similar structures. |
US984337A (en) * | 1909-12-17 | 1911-02-14 | Robert B Woodworth | Metallic tunnel-lining. |
US1779275A (en) * | 1927-11-07 | 1930-10-21 | Humphryes James Harvey | Lining for tunnels, shafts, and the like |
US2783295A (en) * | 1952-01-18 | 1957-02-26 | Gen Electric | Waveguide seal |
US3135538A (en) * | 1959-05-18 | 1964-06-02 | Chemetron Corp | Flanged pipe joint having one flange deflectable |
US3214201A (en) * | 1962-05-29 | 1965-10-26 | Ceilcote Company Inc | Pipe flange |
US3695044A (en) * | 1969-04-12 | 1972-10-03 | Masahiro Hoshino | Sealing method of sealed segments of a tunnel |
US3707846A (en) * | 1968-08-27 | 1973-01-02 | Pont A Mousson | Linings or casings for tunnels, galleries, mine pits and the like |
-
1973
- 1973-06-20 US US371915A patent/US3859802A/en not_active Expired - Lifetime
-
1974
- 1974-06-11 CA CA202,111A patent/CA1005654A/en not_active Expired
- 1974-06-15 DE DE2428936A patent/DE2428936A1/de not_active Withdrawn
- 1974-06-18 JP JP49069617A patent/JPS5052827A/ja active Pending
- 1974-06-20 FR FR7421522A patent/FR2234452A1/fr active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US837767A (en) * | 1906-06-15 | 1906-12-04 | Walton I Aims | Moisture-proof joint. |
US935376A (en) * | 1909-03-20 | 1909-09-28 | Alfred Lennon | Air and water tight joint for tunnels and similar structures. |
US984337A (en) * | 1909-12-17 | 1911-02-14 | Robert B Woodworth | Metallic tunnel-lining. |
US1779275A (en) * | 1927-11-07 | 1930-10-21 | Humphryes James Harvey | Lining for tunnels, shafts, and the like |
US2783295A (en) * | 1952-01-18 | 1957-02-26 | Gen Electric | Waveguide seal |
US3135538A (en) * | 1959-05-18 | 1964-06-02 | Chemetron Corp | Flanged pipe joint having one flange deflectable |
US3214201A (en) * | 1962-05-29 | 1965-10-26 | Ceilcote Company Inc | Pipe flange |
US3707846A (en) * | 1968-08-27 | 1973-01-02 | Pont A Mousson | Linings or casings for tunnels, galleries, mine pits and the like |
US3695044A (en) * | 1969-04-12 | 1972-10-03 | Masahiro Hoshino | Sealing method of sealed segments of a tunnel |
Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3996752A (en) * | 1974-03-22 | 1976-12-14 | Pont-A-Mousson S.A. | Casing panel |
US4459063A (en) * | 1980-08-07 | 1984-07-10 | Shaw Christopher B | Building construction |
US4621951A (en) * | 1983-08-02 | 1986-11-11 | Dewson Frederick J | Modular reusable overcast |
US4621948A (en) * | 1983-11-23 | 1986-11-11 | Hochtief Ag Vorm. Gebruder Helfmann | Tunnel lining form |
US5366318A (en) * | 1990-07-18 | 1994-11-22 | Environ Products, Inc. | Sump assembly |
US5961155A (en) * | 1996-07-11 | 1999-10-05 | Advanced Polymer Technology, Inc. | Flexible entry boot |
US5810400A (en) * | 1996-07-11 | 1998-09-22 | Advanced Polymer Technology, Inc. | Flexible entry boot |
US6173997B1 (en) | 1996-07-11 | 2001-01-16 | Advanced Polymer Technology, Inc. | Flexible entry boot |
US6612620B1 (en) | 1996-07-11 | 2003-09-02 | Advanced Polymer Technology, Inc. | Flexible entry boot |
US6145891A (en) * | 1997-09-29 | 2000-11-14 | Advanced Polymer Technology, Inc. | Double booted flexible entry boot |
US5967567A (en) * | 1998-01-15 | 1999-10-19 | Advanced Polymer Technology, Inc. | Matingly engaged flexible entry boot |
US6086117A (en) * | 1998-05-05 | 2000-07-11 | Advanced Polymer Technology, Inc. | Double booted flexible entry boot |
USD429735S (en) * | 1998-07-23 | 2000-08-22 | Advanced Polymer Technology, Inc. | Integrally formed tank sump with lid |
US6189717B1 (en) | 1998-09-14 | 2001-02-20 | Advanced Polymer Technology, Inc. | Integrally formed tank sump with water resistant lid assembly |
US7056064B2 (en) * | 2002-01-23 | 2006-06-06 | Shonan Gosei-Joshi Seisakusho K.K. | Block unit for repairing flow passage facilities and method of repairing flow passage facilities |
AU2003221369C1 (en) * | 2002-07-24 | 2008-04-24 | Shonan Gosei-Jushi Seisakusho K.K. | Block unit for repairing flow passage facilities and method of repairing flow passage facilities |
US20080267731A1 (en) * | 2003-11-03 | 2008-10-30 | Anatoly Efremov | Bolted flanged connection on a basis of shape memory effect and inverse flexion flange design |
US7699556B2 (en) * | 2003-11-03 | 2010-04-20 | Anatoly Efremov | Bolted flanged connection on a basis of shape memory effect and inverse flexion flange design |
US7819435B2 (en) * | 2004-09-10 | 2010-10-26 | Shonan Gosei-Jushi Seisakusho K.K. | Rehabilitating pipe for repairing existing pipe and method for repairing existing pipe |
US20080054625A1 (en) * | 2004-09-10 | 2008-03-06 | Shonan Gosei-Jushi Seisakusho K.K. | Rehabilitating Pipe for Repairing Pipeline Facilities and Method for Repairing Pipeline Facilities Using Rehabilitating Pipe |
CN101672187B (zh) * | 2009-08-13 | 2012-05-30 | 重庆市十八土鑫诚灌浆防水工程有限公司 | 一种防渗水处理方法 |
US20110136423A1 (en) * | 2009-12-04 | 2011-06-09 | Qun Xia | Large Diameter FRP Flues In Large Diameter Chimneys |
US20110188939A1 (en) * | 2010-02-04 | 2011-08-04 | Sanders Darrell J | Mine shaft liner plate system and method |
US9869090B2 (en) * | 2011-08-12 | 2018-01-16 | Atlantic Industries Limited | Corrugated metal plate and overhead structure incorporating same |
US11384527B2 (en) | 2011-08-12 | 2022-07-12 | Atlantic Industries Limited | Corrugated metal plate and overhead structure incorporating same |
US20140305066A1 (en) * | 2011-08-12 | 2014-10-16 | Atlantic Industries Limited | Corrugated Metal Plate and Overhead Structure Incorporating Same |
US10808395B2 (en) | 2011-08-12 | 2020-10-20 | Atlantic Industries Limited | Corrugated metal plate and overhead structure incorporating same |
US20190017271A1 (en) * | 2011-08-12 | 2019-01-17 | Atlantic Industries Limited | Corrugated Metal Plate and Overhead Structure Incorporating Same |
JP2014077261A (ja) * | 2012-10-10 | 2014-05-01 | Shonan Plastic Mfg Co Ltd | 更生管および管更生工法 |
US9068686B2 (en) * | 2012-10-10 | 2015-06-30 | Shonan Gosei-Jushi Seisakusho K.K. | Rehabilitation pipe and pipe rehabilitation method |
US20140097612A1 (en) * | 2012-10-10 | 2014-04-10 | Shonan Gosei-Jushi Seisakusho K.K. | Rehabilitation pipe and pipe rehabilitation method |
US10443381B2 (en) | 2015-05-28 | 2019-10-15 | Gms Mine Repair And Maintenance, Inc. | Adjustable mine ventilation system and method |
CN105626098A (zh) * | 2015-12-21 | 2016-06-01 | 南京联众建设工程技术有限公司 | 组合式隧道衬砌、涵洞或地下综合管廊 |
CN105422129A (zh) * | 2015-12-21 | 2016-03-23 | 南京联众建设工程技术有限公司 | 用于组合式隧道衬砌、涵洞或综合管廊的拼接结构 |
US11713554B2 (en) * | 2019-03-25 | 2023-08-01 | Kirby W. Isaac | Apparatus for removable insertion into an excavated trench to protect worker against collapse of trench wall |
Also Published As
Publication number | Publication date |
---|---|
DE2428936A1 (de) | 1975-01-23 |
JPS5052827A (enrdf_load_stackoverflow) | 1975-05-10 |
FR2234452A1 (enrdf_load_stackoverflow) | 1975-01-17 |
CA1005654A (en) | 1977-02-22 |
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