WO2005068779A1 - 高耐力鋼管製ロックボルト及びその製造方法 - Google Patents
高耐力鋼管製ロックボルト及びその製造方法 Download PDFInfo
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- WO2005068779A1 WO2005068779A1 PCT/JP2004/011205 JP2004011205W WO2005068779A1 WO 2005068779 A1 WO2005068779 A1 WO 2005068779A1 JP 2004011205 W JP2004011205 W JP 2004011205W WO 2005068779 A1 WO2005068779 A1 WO 2005068779A1
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- Prior art keywords
- pipe
- deformed
- steel pipe
- pressure
- deformed pipe
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 89
- 239000010959 steel Substances 0.000 title claims abstract description 89
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000012530 fluid Substances 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 26
- 239000011701 zinc Substances 0.000 claims description 15
- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 2
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 claims description 2
- -1 zinc-aluminum-magnesium Chemical compound 0.000 claims description 2
- 238000005553 drilling Methods 0.000 claims 1
- 238000005336 cracking Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 238000007747 plating Methods 0.000 description 36
- 239000010410 layer Substances 0.000 description 35
- 239000011435 rock Substances 0.000 description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 230000007797 corrosion Effects 0.000 description 15
- 238000005260 corrosion Methods 0.000 description 15
- 239000011777 magnesium Substances 0.000 description 14
- 229910018134 Al-Mg Inorganic materials 0.000 description 9
- 229910018467 Al—Mg Inorganic materials 0.000 description 9
- 238000005452 bending Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
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- 229910000765 intermetallic Inorganic materials 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000008602 contraction Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000005496 eutectics Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 229910007570 Zn-Al Inorganic materials 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- 229910052727 yttrium Inorganic materials 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- 229910009369 Zn Mg Inorganic materials 0.000 description 2
- 229910007573 Zn-Mg Inorganic materials 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 229910018137 Al-Zn Inorganic materials 0.000 description 1
- 229910018573 Al—Zn Inorganic materials 0.000 description 1
- 206010027476 Metastases Diseases 0.000 description 1
- 229910004349 Ti-Al Inorganic materials 0.000 description 1
- 229910004692 Ti—Al Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/004—Bolts held in the borehole by friction all along their length, without additional fixing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0073—Anchoring-bolts having an inflatable sleeve, e.g. hollow sleeve expanded by a fluid
Definitions
- the present invention relates to a lock port made of a high strength steel pipe which is solidified to the ground or rock by expanding a deformed pipe in the radial direction with the pressure of a press-fitting fluid, and a method for manufacturing the same.
- Steel pipe lockports that are solidified to the ground or rock by expansion are manufactured from hollow deformed pipes with one or more expansion recesses along the axial direction.
- the steel pipe mouth port 1 is sealed at the end and is inserted into the bolt insertion hole drilled in the rock or ground 2 (Fig. 1).
- the steel pipe lock port 1 In the unexpanded state (Fig. 2A), the steel pipe lock port 1 has a gap between the inner wall of the port insertion hole, but expands when fluid pressure is applied from the pressurized fluid supply source 3 (Fig. 2).
- the rock or ground 2 is reinforced by sticking to the inner wall of the port insertion hole (Fig. 2 C).
- a deformed tube with a recess 4 extending in the tube axis direction is used.
- the deformed pipe is sealed at the front and rear ends, and has a pressurized fluid injection hole on the side.
- a deformed pipe with sleeves attached to both ends is also known (Japanese Patent Publication No. 2003-510573).
- rock or ground 2 by inserting a deformed tube with an outer diameter: 36 mm with a recess 4 made from a tube with an outer diameter: 54 mm into a port insertion hole with an inner diameter: 45-50 mm and expanding it with fluid pressure. It is consolidated.
- Inflatable steel pipe rock port is classified as either llOkN class or 170kN class, depending on the ground conditions, ground level, tunnel cross-section shape, etc.
- llOkN class tensile strength: 300NZmm 2 or more, elongation: 30%, plate thickness: 2mm, for 170kN class
- the deformed tube is partially bent with a small bending radius, as seen in the cross section of Figure 2A.
- the bending radius at the center of the plate thickness decreases as the thicker steel plate is used.
- both ends of the deformed pipe are further reduced.
- the thicker the steel plate the smaller the bending radius.
- the bend radius is locally reduced as the steel plate used to improve the lock port resistance increases.
- a high-strength steel sheet is used as a raw material, so that sufficient strength can be ensured even if it is thin, and it is caused by the strain introduced in the forming process, the contraction process at both ends, and the pressure expansion process.
- the purpose is to provide a highly reliable high-resistance steel pipe lock port that can suppress cracking and that starts expansion and deformation at a relatively low pressure during pressurization and expansion, shortens the time to completion of expansion and deformation. To do.
- the lock bolt made of high strength steel pipe of the present invention is made of high strength steel plate with tensile strength: 490-640NZmm 2 , elongation: 20% or more, plate thickness: 1.8-2.3mm, and has one or more concave parts.
- the expansion type lock bolt main body is composed of a deformed pipe extending in the pipe axis direction.
- the deformed tube preferably has mechanical properties of tensile strength: 530 to 690 NZmm 2 , elongation: 20% or more.
- a high-tensile steel plate with a zinc plating layer, a zinc-aluminum alloy plating layer, or a zinc-aluminum-magnesium alloy plating layer can be used.
- the plating layer also exists on the surface of the deformed pipe after roll forming, and protects the mouth port placed on the rock or ground from the corrosive atmosphere.
- This high-resistant steel pipe lock port is manufactured through the following process.
- Fig. 1 is an explanatory diagram for reinforcing the ground by inflating a steel pipe lock port.
- Fig. 2 A is a cross-sectional view of an unexpanded steel pipe lock port inserted into the port insertion hole.
- Fig. 2 B is an explanatory diagram of the pressure applied to the steel pipe lock port during the expansion process.
- Fig. 3 is a graph showing the performance of the hide port pump.
- Fig. 4 is a diagram for explaining the shape change of the cross-section when manufacturing a deformed pipe
- Fig. 5 is an explanatory diagram of the roll shape used in the first process when manufacturing deformed pipes.
- Fig. 6 is an explanatory diagram of the roll shape used in the second process.
- Figure 7 is an explanatory diagram of the roll shape used in the third step.
- FIG. 8 is also an explanatory diagram of the roll shape used in the fourth step.
- the high-resistance steel pipe lock port of the present invention is made of high-strength steel, a thinner steel plate can be used.
- the lock port made from thin steel sheet has a curved part that forms the deformed part in the thickness direction. The minimum bending radius at the center is large. The thinner the material plate, the less strain is introduced when deforming into deformed pipes and when the neck bolt is pressurized and expanded, so there is less cumulative distortion and cracking during pressure and expansion can be avoided. As a result, a reliable rock port can be obtained.
- the ability to use thin steel sheets means that the lock bolt can be reduced in weight while maintaining the same outer diameter, which improves handling and workability at the construction site.
- Thin-walled rock port starts bulging deformation of the deformed pipe recess when the added water pressure is low. Since deformation continues at a low water pressure even after the start of bulging deformation, the load on the high-pressure pump is reduced, and a larger amount of high-pressure water can be discharged and supplied at a relatively low discharge pressure, resulting in the time required for pressurization and expansion. Is shortened. In this respect as well, it is advantageous to use a thin steel plate as the material, which leads to a dramatic improvement in workability.
- tensile strength 300NZmm class 2 elongation: about 35%
- plate thickness 3mm
- outer diameter 54mm steel pipe deformed to outer diameter: 36mm Due to the deformation, a deformed pipe with a tensile strength of 400NZmm 2 has been used for mouth port.
- the availability of thin steel plates means that the bending radius of the part that undergoes bending deformation during the production of deformed pipes can be set relatively large.
- the wall thickness is 3 mm.
- the resulting deformed tube has an inner bend radius of 2 mm, but the deformed tube obtained from a round pipe with a wall thickness of 2 mm has an inner bend radius of 3 mm.
- the smaller the wall thickness of the welded steel pipe in other words, the thickness of the steel plate
- the volume is reduced.
- the allowable strain amount up to the limit cumulative strain leading to cracking is large, and the possibility of bursting (rupture) during pressurization and expansion is reduced.
- the thickness of the steel sheet is selected in the range of 1.8 to 2.3 mm. If the plate thickness exceeds 2.3 mm, it is difficult to obtain the effect of increasing the bending radius when manufacturing deformed pipes. Conversely, in order to obtain a rock port with 170 kN class resistance from a steel plate with a thickness of less than 1.8 mm, high strength steel with a tensile strength exceeding 640 NZmm 2 is required. With such high-strength steel, it is impossible to secure the necessary elongation when manufacturing deformed pipes, and it is extremely difficult to manufacture deformed pipes required for the expansion-type lock port from welded steel pipes with an outer diameter of about 50 to 55 mm. is there.
- the expansion-type steel pipe lock port has a deformed pipe with a deformed cross-section as shown in Fig. 2A, for example, pressurizing a pressurized fluid into the deformed pipe to invert and bulge the recess 4, and restore the original circular cross-section. It is a rock port that reinforces the rock mass by the consolidation force between the steel pipe and the rock mass that is generated when the pressure is expanded. If the deformed deformed pipes have different wall thicknesses, the pressure required to invert and bulge the recesses 4 formed in each of them will also change.
- the amount of inflow from the pump is large when the container pressure is low, but the amount of inflow increases as the container pressure increases. Less. From the relationship between the pressure in the container and the amount of inflow, a low pressure at which the concave portion 4 of the deformed pipe starts to expand means that a large amount of fluid is sent into the deformed pipe at the low pressure stage before the start of the expansion. . On the other hand, if the bulging start pressure is high, the inside of the deformed pipe gradually becomes high pressure and the fluid inflow gradually decreases. As a result, the fluid supply must be continued for a long time before reaching the high pressure.
- Fig. 3 shows the relationship between the discharge pressure and the discharge pressure of high-pressure water when air with a pressure of 0.6 MPa is supplied using a hydropump with an air-water cross-sectional area ratio of 65/1.
- the relationship in Fig. 3 shows that the discharge amount of high-pressure water gradually decreases as the pressure in Lockport increases, and that the discharge amount decreases to 10.6LZ when the pressure in Lockport reaches 7MPa.
- wall pressure 7MPa pressure required to start bulging of recess 4 provided in 2mm deformed pipe
- wall thickness 17MP & pressure required to start bulging of recess 4 provided in 3mm deformed pipe :
- the deformed pipe with a wall thickness of 2mm begins to bulge at a pressure of 7MPa.
- the deformed pipe with a wall thickness of 3mm does not start bulging at a pressure of 7MPa, but starts to bulge when the pressure in Lockport reaches 17MPa.
- Pressure At 17MPa, the discharge volume is reduced to 7.2LZ.
- the bulging deformation proceeds with a pressure less than the bulging start pressure, and takes a uniform bulging form regardless of the thickness difference of the deformed pipe.
- the deformed pipe is expanded until it corresponds to the inner diameter of the port insertion hole drilled in the ground or rock, the pressure necessary to press the inner wall of the port insertion hole with the expanded deformed pipe is further applied to the deformed pipe .
- the wall thickness compared with the 2 mm deformed pipe, the wall thickness: With the 3 mm deformed pipe, the lock port pressure is increased from 7 MPa to 17 MPa, and the discharge pressure: 7 MPa ⁇ : It is necessary to continue to supply high-pressure water at a discharge rate corresponding to L7MPa, and the operation time of the hide port pump will be increased accordingly.
- the pressure required for further bulging deformation is also higher than that of the 2 mm thick pipe, and it is required to continue the bulging deformation of the deformed pipe by supplying high-pressure water in a region where the discharge volume is low. .
- a thick deformed pipe takes longer to pressurize and bulge than a thin deformed pipe.
- the thin profile tube made of high-strength steel plate is advantageous as a rock-pull soot that rapidly expands under pressure.
- Mouth bolts made of high-strength steel sheets are manufactured in the following process.
- a high-strength steel plate with the specified mechanical properties: 1.8-2.3 mm is used, and a welded steel pipe with an outer diameter of about 50-55 mm is manufactured by the usual pipe making method.
- the pipe making method includes high-frequency melting. Welding, laser welding, TIG welding, etc. can be used.
- a deformed pipe with an outer diameter of 34 to 38 mm having a concave cross-sectional shape with the outer circumference defined by the circumference and the recess 4 following the circumference is manufactured.
- the mouth forming method introduced in Japanese Patent Laid-Open No. 2003-145216 is preferable.
- roll forming not only roll forming but also a deformed pipe can be manufactured by extrusion or press forming. .
- a deformed tube is manufactured while the cross-sectional shape is deformed as shown in Fig. 4.
- the radius of curvature of the concave crown is transferred to the welded steel pipe M, and the round cross section Co (Fig. 4a) is a convex curved surface Fii and curvature with a large radius of curvature.
- the cross-sectional shape Ci (Fig. 4b) is composed of convex curved surface F 2 i with small radius.
- a disc-shaped roll is pressed against the center of the convex curved surface Fii having a large radius of curvature to be recessed inside (Fig. 4c).
- it has a disk-shaped roll 21 with a small radius of curvature at the end face, and a forming roll 22 with a concave crown with a radius of curvature equal to or less than the concave roll of the small roll 12 used in the first process.
- the same mouthstand is used (Fig. 6).
- a multi-stage roll stand equipped with a plurality of pairs of disc-shaped rolls and forming rolls with gradually decreasing radii of curvature can be used.
- the inner diameter of the port insertion hole drilled in the bedrock or ground is larger than the outer diameter of the deformed pipe because it presses the expanded deformed pipe and pressurizes the inner wall of the port insertion hole.
- the cross-sectional shape C2 is changed to a small-diameter cross-sectional shape.
- a roll stand equipped with a pair of forming rolls 31 and 32 (Fig. 7) with a concave radius with a smaller radius of curvature than the initial diameter of welded steel pipe M is used.
- a multi-stage roll stand equipped with a plurality of pairs of forming rolls with gradually decreasing radii of curvature can be used.
- the convex surface F22 When passing the cross-sectional shape C 2 of the tube material between the forming roll 31, 32, forming roll 31, 32 the convex surface F22 is curved so as to narrow the opening 0 in accordance with a concave crown, a curvature radius of the small circle curved Molded to F23 (Fig. 4d). Along with the curved deformation of the convex curved surface F22, the bowl-shaped curved surface Fl2 also becomes a curved surface Fl3 with a small curvature radius.
- the welded steel pipe M is rotated 90 degrees in the cross-sectional direction from the relative positional relationship of the welded steel pipe M with respect to the forming roll 11, 12, the second process disk-shaped roll 21, and the forming roll 22 in the first process.
- the opening 0 and the welded portion w are preferably positioned between the forming rolls 31 and 32.
- the rotational positional relationship 90 degrees, forming roll 31 acting on the convex surface F22, 32 pressing force is equalized Ichika the radius of curvature uniform curved surface Fi3, cross section C 3 having a circumferential curved surface F 23 (FIG. 4 d ).
- Sectional shape C 3 to opening 0 is narrowed is further shaped to the cross-sectional shape C4 of Do outer diameter smaller than Porto ⁇ holes in the fourth step.
- a roll stand provided with a presser roll 43 in addition to the pair of forming rolls 41 and 42 is preferably used.
- the roll stand of similar configuration and a plurality of stages arranged, it may be molded to the cross-sectional shape C 3 to the small diameter of the cross section C4 in multiple stages.
- both ends are sealed.
- the tube end on the sealed side is axially length from the tip: 80mm.
- the tube end is contracted to an outer diameter of 32 to 34mm with a crimping die, the outer diameter is 36 to 40mm, and the wall thickness is 2.0 to A sleeve of 3.0mm, length: 60-80mm is put on the constricted tube, and a tube end sealing punch is press-fitted into the opening of the tube end, and the tube end is molded into a flat and flat state along the punch base and welded. Sealed.
- the pipe end on the pressurized fluid press-fitting side is similarly contracted from the pipe end with an axial length of 80 mm from the tip, and then outer diameter: 40 to 42 mm, wall thickness: 3.5 to 4.5 mm, length: 60 to
- An 80mm sleeve is put on the contraction tube, a tube end sealing punch is press-fitted into the tube end opening, the tube end is formed into a flat contact state along the punch cap, and welded and sealed.
- the sleeve attached to the pipe end on the pressurized fluid injection side is preferably a sleeve with an annular groove to securely chuck the lock port during the rock bolt bow I extraction test embedded in the rock or ground.
- a pressurized fluid injection hole reaching the inside of the deformed pipe is drilled in the sleeve on the pressurized fluid injection side.
- the position of the pressurized fluid press-fitting hole is set at a position slightly away from the end of the sleeve.
- Rockport placed in bedrock and ground is exposed to various environments from acidity to alkalinity, depending on the amount of water, water quality, and air flow.
- a plated steel pipe with a layer of inner and outer surfaces is used as the material for ROCKPORT, the corrosion resistance in the rock and ground is improved, and ROCKPORT with excellent durability can be obtained.
- the plated steel pipe can be manufactured by either pre-plating or post-plating, but a pre-plated steel pipe made from a plated steel sheet is preferred from the viewpoint of productivity.
- plating there are various types of plating, such as Zn-based plating, Zn-Al-based alloy plating, and Zn-Al-Mg-based alloy plating.
- Zn-based plating a plating layer using a plating bath to which about 0.:! To about 0.2% by mass of A1 is added and growth of the Fe—Zn-based alloy layer is suppressed to improve workability is preferable.
- ⁇ ⁇ ⁇ ⁇ ⁇ 1 alloy plating there are Zn-5% A1, Zn-55% A1, etc., which show corrosion resistance 2 to 4 times that of the Zn plating layer of the same thickness.
- the Zn-Al-Mg alloy plating layer imparts high corrosion resistance and is a hard plating layer, so it can be made as thin as 3 to 30 ⁇ compared to the Al-Zn plating layer.
- Mg forms a Zn-based corrosion product containing Mg in the outermost layer of the plating layer, and reduces the corrosion rate of the plating layer in the soil environment together with A1 in the plating layer.
- a part of the corrosion product also flows into the cut end face of the weld bead when manufacturing a pre-plated steel pipe, and the bead part is prevented from corroding the cut end face.
- the Mg-containing Zn-based corrosion product flows into the sprayed layer or into the corrosion product on the sprayed layer to protect the underlying steel substrate.
- Mg is an effective component for making the plating layer harder by forming a Zn-Mg intermetallic compound in the plating layer. In order to achieve such an effect, the Mg content is adjusted to a range of 0.05 to 10% by mass (preferably 1 to 4% by mass).
- Zn and Mg in the plating layer form Mg-containing Zn-based corrosion products, whereas A1 forms extremely strong Zn-Al-based corrosion products, contributing to the improvement of corrosion resistance.
- Zn / AlZZn 2 Mg ternary eutectic appears in the solidified structure of the clinging layer.
- the Zn / Al / Zn 2 Mg ternary eutectic structure is finer than the ZnZZn 2 Mg binary eutectic structure, and is effective in hardening the adhesion layer with improved corrosion resistance.
- A1 content of 4% by mass or more is required to form a Zn-Al based corrosion product with strong adhesion and to form a ZnZAl / Zn 2 Mg ternary eutectic structure.
- the upper limit of the A1 content is 22% by mass.
- Ti and B which are optional components, suppresses the formation of ZniiMg 2 phase, which harms the surface appearance, and the Zn-Mg intermetallic compound crystallized in the plating layer is substantially composed of Zn 2 Mg. It becomes only. Specifically, Ti: 0.001% by mass or more (preferably 0.002% by mass or more) can effectively suppress the formation of the ZniiMg 2 phase. However, if an excessive amount of Ti exceeding 0.1% by mass is contained, Ti-Al-based precipitates grow in the plating layer, resulting in unevenness (bumps) in the plating layer and the appearance is impaired.
- Suppression of the formation of the ZnuMg2 phase can also be achieved by containing B in an amount of 0.0005% by mass or more (preferably 0.001% by mass or more). However, if an excessive amount of B exceeds 0.045% by mass, Ti-B and A1-B precipitates grow in the plating layer, causing unevenness in the plating layer, which may impair the appearance. become.
- the surface gloss deterioration phenomenon is a phenomenon in which the surface of the plating layer changes from a beautiful metallic luster immediately after production to gray, which lowers the value of Rockport.
- the surface gloss deterioration phenomenon can be suppressed.
- the upper limit for the addition of rare earth elements, Y, Zr, Si, etc. should be 2.0% by mass.
- Fe-Al intermetallic compounds are likely to be locally generated at the bonding layer / underlying steel interface. Fe-Al intermetallic compounds induce peeling of the plating layer during the forming process of plated steel sheets and steel pipes. The formation of Fe-Al intermetallic compounds that are harmful to workability can be suppressed by adding a trace amount of Si to the plating layer.
- a high strength steel plate with tensile strength: 490 NZmm 2 , elongation: 28%, plate thickness: 2.1 mm was formed into a welded steel pipe with an outer diameter of 54 mm.
- a welded steel pipe was roll-formed to produce a deformed pipe with an outer diameter of 36 mm having a cross-sectional shape (Fig. 2A) with the recess 4 extending in the pipe axis direction.
- the obtained deformed pipe had a tensile strength of 550 N / mm 2 .
- the deformed tube was cut to a length of 4 m, and the tube ends of 75 mm in length from both cut end surfaces were reduced to an outer diameter of 33.1 mm.
- a sleeve with a wall thickness of 2.5 mm and a length of 70 mm was attached, and the pipe end was welded and sealed.
- Pressurization A sleeve with an inner diameter of 33.1 mm, an outer diameter of 41.1 mm, a wall thickness of 4.0 mm, and a length of 70 mm was attached to the other contraction tube on the fluid injection side, and the end of the tube was welded and sealed.
- a pressurized fluid injection hole with a diameter of 3.0mm reaching the inside of the deformed pipe was drilled on the side of the pressurized fluid injection side sleeve.
- Each of the lock port of the present invention example and the comparative example is covered with a pressurizing expansion seal head, and high pressure water is press-fitted into the deformed pipe from the hydropump to pressurize and expand the deformed state at the time of expansion. investigated.
- the bulging deformation of the recess 4 (FIG. 2A) started. After the start of bulging deformation, the bulging deformation continued at a water pressure of 5 MPa. While the bulging deformation progressed, high-pressure water was fed into the deformed pipe at a flow rate of 11.3 L under 5 MPa water pressure, and the bulging deformation of the deformed pipe was completed in 31 seconds.
- the pressurization time until a predetermined expansion state is obtained can be shortened to about 3Z4 of the conventional product.
- the shortening of the pressurization time will lead to a drastic reduction in the period for rock reinforcement such as tunnels where the number of Rockports to be installed is several hundred to several thousand.
- the load on the hide port pump used is also reduced.
- the lock port of the present invention sufficiently satisfied the 170 kN class.
- the lock port of the example of the present invention is about 30% lighter because it is thinner than the lock port of the comparative example, making it easy to transport to the construction site and handle it at the construction site.
- the deformed tube has less accumulated strain, bursts due to strain introduction during pressurization and expansion It will be suppressed and the safety of the lock port placement work will be improved.
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Earth Drilling (AREA)
- Piles And Underground Anchors (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04771232.8A EP1724435B1 (en) | 2004-01-14 | 2004-07-29 | Rockbolts made of high strength steel pipes and method of manufacturing thereof |
CA2553344A CA2553344C (en) | 2004-01-14 | 2004-07-29 | Rockbolts made of high-strength steel pipes and method of manufacturing thereof |
US10/586,088 US7794179B2 (en) | 2004-01-14 | 2004-07-29 | Rockbolt of high strength steel pipe and method of manufacturing the same |
ES04771232.8T ES2548088T3 (es) | 2004-01-14 | 2004-07-29 | Pernos para roca realizados de tubos de acero de alta resistencia y procedimiento de fabricación de los mismos |
PL04771232T PL1724435T3 (pl) | 2004-01-14 | 2004-07-29 | Kotwy wykonane z rur stalowych o wysokiej wytrzymałości i sposób ich wytwarzania |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-007046 | 2004-01-14 | ||
JP2004007046A JP2005200893A (ja) | 2004-01-14 | 2004-01-14 | 高耐力鋼管膨張型ロックボルト及びその製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005068779A1 true WO2005068779A1 (ja) | 2005-07-28 |
Family
ID=34792167
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/011205 WO2005068779A1 (ja) | 2004-01-14 | 2004-07-29 | 高耐力鋼管製ロックボルト及びその製造方法 |
Country Status (8)
Country | Link |
---|---|
US (1) | US7794179B2 (ja) |
EP (1) | EP1724435B1 (ja) |
JP (1) | JP2005200893A (ja) |
CN (1) | CN100529331C (ja) |
CA (1) | CA2553344C (ja) |
ES (1) | ES2548088T3 (ja) |
PL (1) | PL1724435T3 (ja) |
WO (1) | WO2005068779A1 (ja) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT501441A3 (de) * | 2004-12-23 | 2009-12-15 | Atlas Copco Mai Gmbh | Verfahren zum setzen von gebirgsankern und bei diesem verfahren verwenbarer gebirgsanker |
JP4831615B2 (ja) * | 2006-08-22 | 2011-12-07 | 日新製鋼株式会社 | 沈下基礎修復用膨張型鋼管の製造方法 |
JP2012077509A (ja) * | 2010-10-01 | 2012-04-19 | Kajima Corp | 膨張型鋼管ロックボルト及びその製造方法、地山補強工法 |
JP2012255318A (ja) * | 2011-06-10 | 2012-12-27 | Kajima Corp | 凸部付き拡張型ロックボルト |
SE535912C2 (sv) * | 2011-06-30 | 2013-02-12 | Leif Eriksson | Expanderbar bergbult och ett förfarande för tillverkning av en bergbult |
CN102562108B (zh) * | 2012-01-16 | 2014-04-30 | 成都现代万通锚固技术有限公司 | 一种高强度轻型中空锚杆及其加工方法 |
WO2013186284A1 (de) * | 2012-06-12 | 2013-12-19 | H + T Handel Und Technik Berwald Gmbh & Co. Kg | Ankerelemente und verfahren zur herstellung von ankerelementen |
JP6053116B2 (ja) * | 2012-09-11 | 2016-12-27 | 株式会社ケー・エフ・シー | 膨張用異型鋼管及びその製造方法 |
KR101530588B1 (ko) * | 2013-12-31 | 2015-06-22 | 주식회사 티에스테크노 | 락볼트 제조방법 |
KR101666646B1 (ko) * | 2015-12-30 | 2016-10-14 | (주)서동 | 보론강을 이용한 초고강도 강관 지보재 제조방법 및 지보재 어셈블리 |
US20180135411A1 (en) * | 2016-11-17 | 2018-05-17 | Fci Holdings Delaware, Inc. | Corrosion Resistant Expandable Bolt |
CN108286459B (zh) * | 2018-01-16 | 2019-10-25 | 山东科技大学 | 巷道顶板潜在危险性岩层范围的确定方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63185900U (ja) * | 1987-05-21 | 1988-11-29 | ||
JPS6443700A (en) * | 1987-08-12 | 1989-02-15 | Sato Kogyo | Method of fixing construction of tubular lock bolt |
JPH07189598A (ja) * | 1993-12-27 | 1995-07-28 | K F C:Kk | ロックボルトの施工法 |
JP2003206698A (ja) | 2001-10-05 | 2003-07-25 | Nisshin Steel Co Ltd | めっき鋼管製ロックボルト |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE427764B (sv) * | 1979-03-09 | 1983-05-02 | Atlas Copco Ab | Bergbultningsforfarande jemte rorformig bergbult |
CA1233037A (en) | 1979-03-09 | 1988-02-23 | Gunnar V.R. Romell | Method of rock bolting and tube-formed expansion bolt |
ZA811894B (en) | 1980-03-28 | 1982-04-28 | R Thom | An anchor bolt |
US4636115A (en) * | 1980-11-10 | 1987-01-13 | The Curators Of The University Of Missouri | Expansion bolt and mine roof reinforcement therewith |
SE8106165L (sv) * | 1981-10-19 | 1983-04-20 | Atlas Copco Ab | Forfarande for bergbultning och bergbult |
JPS63185900A (ja) | 1987-01-29 | 1988-08-01 | Sumitomo Electric Ind Ltd | 複合酸化物強誘電体の単結晶ウエハの熱処理方法 |
JPH0414000Y2 (ja) | 1987-09-11 | 1992-03-30 | ||
SE9902065L (sv) | 1999-06-04 | 2000-05-22 | Atlas Copco Rock Drills Ab | Rörformad bergbult |
EP1193323B1 (en) | 2000-02-29 | 2016-04-20 | Nippon Steel & Sumitomo Metal Corporation | Plated steel product having high corrosion resistance and excellent formability and method for production thereof |
JP3868797B2 (ja) | 2001-11-09 | 2007-01-17 | 日新製鋼株式会社 | ロックボルト用異形管の製造方法およびその製造装置 |
-
2004
- 2004-01-14 JP JP2004007046A patent/JP2005200893A/ja active Pending
- 2004-07-29 PL PL04771232T patent/PL1724435T3/pl unknown
- 2004-07-29 EP EP04771232.8A patent/EP1724435B1/en active Active
- 2004-07-29 WO PCT/JP2004/011205 patent/WO2005068779A1/ja active Application Filing
- 2004-07-29 US US10/586,088 patent/US7794179B2/en active Active
- 2004-07-29 CA CA2553344A patent/CA2553344C/en active Active
- 2004-07-29 CN CNB2004800403261A patent/CN100529331C/zh active Active
- 2004-07-29 ES ES04771232.8T patent/ES2548088T3/es active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63185900U (ja) * | 1987-05-21 | 1988-11-29 | ||
JPS6443700A (en) * | 1987-08-12 | 1989-02-15 | Sato Kogyo | Method of fixing construction of tubular lock bolt |
JPH07189598A (ja) * | 1993-12-27 | 1995-07-28 | K F C:Kk | ロックボルトの施工法 |
JP2003206698A (ja) | 2001-10-05 | 2003-07-25 | Nisshin Steel Co Ltd | めっき鋼管製ロックボルト |
Non-Patent Citations (1)
Title |
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See also references of EP1724435A4 |
Also Published As
Publication number | Publication date |
---|---|
EP1724435B1 (en) | 2015-07-29 |
CN1926306A (zh) | 2007-03-07 |
US7794179B2 (en) | 2010-09-14 |
CA2553344A1 (en) | 2005-07-28 |
EP1724435A4 (en) | 2009-09-30 |
ES2548088T3 (es) | 2015-10-13 |
CN100529331C (zh) | 2009-08-19 |
US20080107488A1 (en) | 2008-05-08 |
PL1724435T3 (pl) | 2015-11-30 |
CA2553344C (en) | 2010-11-02 |
EP1724435A1 (en) | 2006-11-22 |
JP2005200893A (ja) | 2005-07-28 |
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