CN111059125A - T-shaped unilateral bolt fastener - Google Patents
T-shaped unilateral bolt fastener Download PDFInfo
- Publication number
- CN111059125A CN111059125A CN201911184584.1A CN201911184584A CN111059125A CN 111059125 A CN111059125 A CN 111059125A CN 201911184584 A CN201911184584 A CN 201911184584A CN 111059125 A CN111059125 A CN 111059125A
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- bolt
- head
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- shaped
- sleeve
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- 238000009434 installation Methods 0.000 claims description 28
- 244000208734 Pisonia aculeata Species 0.000 claims 1
- 238000012856 packing Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000011900 installation process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/06—Specially-shaped heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
- F16B13/10—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front with separate gripping parts moved into their final position in relation to the body of the device by a separate operation
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
The invention relates to a T-shaped unilateral bolt fastener, which is used for fixing a connecting piece and comprises a bolt, a bolt sleeve, a large washer and a large nut, wherein the bolt sleeve, the large washer and the large nut are respectively sleeved on the bolt, the bolt sleeve is arranged in a mounting hole, the head of the bolt, the large washer and the large nut are respectively arranged on two sides of the connecting piece, and the connecting piece is fastened and installed.
Description
Technical Field
The invention relates to the technical field of civil and architectural engineering and mechanical assembly, in particular to a T-shaped unilateral bolt fastener.
Background
Currently, in the fields of civil construction and mechanical installation, the installation requirement for connecting and fastening structural components is large. In the case of bolts which are currently in common use, when fastening and connecting members, workers need to work on both sides of the members at the same time, namely, insert a bolt with a nut on one side and then tighten a large nut with a tool on the other side. The connecting and fastening method is simple in structure, convenient to operate and good in bearing capacity, but is only suitable for members with open sections, and in some special occasions, such as when connecting and fastening members with closed sections or members which are inconvenient to operate on the other side, the common connecting and fastening method of bolts and nuts cannot be used. Such as: in steel pipe structures and steel pipe concrete structures, beam column connection nodes cannot be fastened and installed by the common bolt and nut connection fastening method because steel pipe columns are closed sections and cannot be operated on two sides and can be connected and installed only on one side. At present, corresponding unilateral bolt products are not available in domestic markets, published related patents have similar products in foreign markets, namely too much weakening of a bolt rod or too few stress points of a bolt head, but the existing patents or products are difficult to apply large pretension force to the bolt in the installation stage to form a friction type bolt connecting joint, the bearing comprehensive mechanical property of the joint is not ideal, and the joint is greatly limited in application of building structure earthquake-resistant design.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a T-shaped unilateral bolt fastener, wherein a special-shaped mounting hole is customized on a connecting piece to be fastened, and the firm and reliable unilateral bolt fastening function is achieved through simple and rapid installation.
The purpose of the invention can be realized by the following technical scheme:
a T-shaped unilateral bolt fastener is used for fixing a connecting piece and comprises a bolt, a bolt sleeve, a large washer and a large nut, wherein the bolt sleeve, the large washer and the large nut are respectively sleeved on the bolt;
when the unilateral bolt fastener is installed, a mounting hole matched with a bolt head is formed in the connecting piece, the bolt sleeve, the large washer and the large nut are sequentially sleeved on the bolt rod, the bolt head and the bolt sleeve are overlapped with each other and are pushed into the mounting hole together, after the bolt head rotates for a set angle, the bolt is pulled back, the bolt head abuts against the inner side wall of the connecting piece, the large nut is screwed, and installation is completed.
Furthermore, the bolt head is of an A-shaped flat key structure and is integrally formed by semi-cylinders on two sides and a cuboid in the middle, the bolt rod extends out of the centroid of the cross section of the bolt head, an external thread matched with the large nut is arranged at the tail of the bolt rod, and the bolt head and the bolt rod are matched with each other to form the T-shaped bolt.
Furthermore, a positioning groove is formed in the middle of one surface of the bolt sleeve in the width direction, the width of the positioning groove is larger than or equal to that of the middle of the bolt head, a through hole is formed in the bottom of the positioning groove, and the diameter of the through hole is larger than the nominal diameter of the bolt rod.
Further, the set angle is 90 degrees, after the bolt head penetrates through the mounting hole and the bolt sleeve to enter the mounting hole, the bolt head is rotated by 90 degrees and pulled back, the positioning groove is clamped in the middle of the bolt head, the semi-cylinders at the two ends abut against the inner side wall of the connecting piece, the bolt head, the mounting hole and the bolt sleeve form a cross shape, and finally the large nut is screwed down to complete the installation.
The length dimension of the twisted bolt head is larger than the width dimension, so that a sufficient fastening matching area is generated, the T-shaped bolt is symmetrical in structure, the stress is balanced symmetrically in working state, the stress distribution is good, and the mechanical property of the T-shaped bolt as a fastening piece is excellent.
Preferably, chamfers are arranged on the tops of the two side walls of the positioning groove, so that the middle of the bolt head can be conveniently clamped and aligned.
Still further preferably, the chamfer angle at the top of the two side walls of the positioning groove is a chamfer angle of 45 degrees, and the depth is 1 mm-2 mm.
Further preferably, the maximum thickness of the bolt sleeve is greater than the clamping length of the connecting piece, and the minimum thickness of the bolt sleeve is less than the clamping length of the connecting piece, so that the bolt head can be conveniently clamped in the positioning groove after being twisted for 90 degrees.
Still further preferably, the maximum thickness of bolt cover 5mm ~ 8mm more than the tight length of clamp of connecting piece, the groove depth of constant head tank correspondingly be 7mm ~ 10mm, the groove depth of constant head tank, the maximum thickness of bolt cover and the tight length of clamp of connecting piece cooperate and correspond the setting each other, when making the installation accomplish, leave 1 ~ 2 mm's space between the tank bottom of constant head tank and the connecting piece inside wall to make the bolt cover can have 1 ~ 2 mm's home range along the axial of bolt in the connecting piece, constant head tank width 1mm than the width at bolt head middle part greatly.
Further, the outer diameter of the large washer is larger than the width of the mounting hole, and the inner diameter of the large washer is larger than the nominal diameter of the screw thread of the bolt rod.
Compared with the prior art, the invention has the following advantages:
1) the T-shaped bolt is twisted after passing through the special-shaped mounting hole, the length size of the head of the T-shaped bolt is larger than the width size of the head of the T-shaped bolt, and sufficient fastening matching area is generated;
2) the bolt sleeve realizes the positioning and installation of the bolt through the positioning groove structure, ensures the simple positioning and stable connection in the installation process, and greatly improves the working stability and the installation convenience of the unilateral bolt fastener;
3) the customized mounting holes on the connecting plate are symmetrical in shape and small in structural size, the strength of the connecting plate is weakened very little, the influence on the strength of the whole construction structure is very small, and the unilateral mounting characteristic and the fastening mechanical property of the connecting plate can be realized under the condition of different strength requirements;
4) the invention utilizes the self components and characteristics of the unilateral bolt fastener, can complete installation without additional installation tools, has lower requirement on installation workers, simple and rapid installation process, is convenient for quickly and efficiently carrying out the installation work of the unilateral bolt fastener in engineering, meets the installation efficiency and reliability requirements of a construction site, and has wide application range.
Drawings
FIG. 1 is a schematic view of the main components of the present invention;
FIG. 2 is a schematic view of the T-bolt of the present invention;
FIG. 3 is a schematic view of the bolt sleeve of the present invention;
FIG. 4 is a schematic view of the fastener of the present invention in preparation for completion and prior to installation;
FIG. 5 is a schematic view of the bolt of the present invention before it is twisted, wherein FIG. 5a is a perspective view and FIG. 5b is a side view;
FIG. 6 is a schematic view of the positioning of the bolt of the present invention after it is twisted, wherein FIG. 6a is a perspective view and FIG. 6b is a side view;
fig. 7 is a schematic view of the one-side bolt fastener of the present invention after completion of installation, in which fig. 7a is a side sectional view and fig. 7b is a perspective view.
Wherein: 1. the bolt comprises a bolt body 1a, a bolt head 1b, a bolt rod 2, a bolt sleeve 2a, a positioning groove 2b, a through hole 3, a large washer 4, a large nut 5, a connecting piece 5a and a mounting hole.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Examples
As shown in fig. 1, the invention provides a T-shaped unilateral bolt fastener, which includes a bolt 1, and a bolt sleeve 2, a large washer 3 and a large nut 4 respectively sleeved on the bolt 1, wherein a mounting hole 5a is correspondingly processed on a connecting member 5, after the mounting is completed, the bolt head 1a of the bolt 1 is arranged on the inner side of the connecting member 5, the bolt sleeve 2 is arranged in the mounting hole 5a, and the washer 3 and the large nut 4 are sequentially arranged on the mounting side of the connecting member 5.
As shown in fig. 2, the T-shaped bolt includes a bolt head 1a and a bolt shaft 1b that are connected to each other, the bolt head 1a is a bolt head of a similar a-type flat key structure, the bolt shaft 1b extends from a centroid of a cross section of the bolt head 1a, and an external thread is provided at a tail portion of the bolt shaft, and the external thread adopts a common thread size standard.
As shown in fig. 3, the cross section of the bolt sleeve 2 is the same as the cross section of the bolt head 1a in shape and size, and is also of an a-type flat key structure, the middle part of one surface of the bolt sleeve is provided with a positioning groove 2a along the width direction, the width of the positioning groove 2a is equal to or slightly greater than the width of the middle part of the bolt head 1a, in the embodiment, the width of the positioning groove is 1mm greater than the width of the bolt head 1a, the center of the bottom of the positioning groove 2a is provided with a through hole 2b, the diameter of the through hole 2b is slightly greater than the nominal diameter of the thread of the bolt rod 1b, and two sides of the upper part of the positioning groove 2a are provided with chamfers 2c, in the embodiment, the chamfer 2c has an angle. The maximum thickness of the bolt sleeve 2 is greater than the clamping length of the connecting piece 5, and the minimum thickness (namely the thickness of the position of the positioning groove 2a) is less than the clamping length of the connecting piece 5, in the embodiment, the maximum thickness of the bolt sleeve 2 is 5mm more than the clamping length of the connecting piece 5, the groove depth of the positioning groove 2a is 7mm correspondingly, a gap of 2mm is reserved between the groove bottom of the positioning groove 2a and the inner side wall of the connecting piece 5, and therefore the bolt sleeve 2 can have a 2mm moving range in the connecting piece 5 along the axial direction of the bolt 1.
As shown in fig. 1, the mounting hole 5a formed in the connecting member 5 is a special-shaped mounting hole with a similar a-shaped flat keyway cross section, and is matched with the shapes and the sizes of the bolt head 1a and the bolt sleeve 2. The size of the mounting hole 5a is slightly larger than the section parameter of the bolt head 1a, and forms clearance fit with the bolt sleeve 2.
The large washer 3 has an outer diameter larger than the width of the mounting hole 5a and an inner diameter slightly larger than the nominal diameter of the thread of the bolt shank 1 b. The thread parameters of the large nut 4 are the same as those of the T-shaped bolt.
As shown in fig. 4 to 7, during installation, firstly, a bolt sleeve 2 is sleeved on a bolt rod 1b, one side, provided with a positioning groove 2a, of the bolt sleeve 2 is close to a bolt head 1a, the outline of the bolt head 1a is overlapped with that of the bolt sleeve 2, then a large washer 3 and a large nut 4 are sleeved on the bolt rod 1b, and the large nut 4 is screwed in a certain length, so that the tail part of the bolt rod 1b is exposed out of a holding part of more than 1 cm; the T-shaped bolt passes through the customized mounting hole 5a, then the large washer 3 is propped against the connecting piece 5, the tail part of the bolt rod 1b is held by hand to twist the T-shaped bolt by 90 degrees and pull back, and the T-shaped bolt is checked and ensured not to be twisted continuously; and finally, screwing the large nut 4 to finish the installation.
In this embodiment, the mounting process of the unilateral bolt fastener is specifically as follows:
1. as shown in fig. 4, a bolt sleeve 2 is sleeved on a bolt rod 1b, one surface of the bolt sleeve 2, which is provided with a positioning groove 2a, is close to the bolt head 1a, and is twisted to enable the outlines of the bolt sleeve 2 and the bolt head 1a to be overlapped, a large washer 3 and a large nut 4 are sleeved on the bolt rod 1b, the large nut 4 is screwed in for a certain length, so that the tail part of the bolt rod 1b is exposed out of a holding part of more than 1cm, and the preparation work is completed;
2. pushing the T-bolt through the mounting hole 5a and then pressing the large washer 3 against the connecting piece 5, as shown in fig. 5;
3. the T-shaped bolt is twisted by 90 degrees and pulled back by the screw thread at the tail part of the hand-held bolt rod 1b, the bolt head 1a is clamped into the positioning groove 2a and is propped against the inner side of the connecting piece 5, and the T-shaped bolt can not be twisted continuously by checking and ensuring, as shown in fig. 6;
4. and (3) screwing the large nut 4 to finish installation, wherein the bolt sleeve 2 is arranged in the installation hole 5a at the moment, and the bolt head 1a, the installation hole 5a and the bolt sleeve 2 form a cross shape to realize stable fastening connection as shown in fig. 7.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A T-shaped unilateral bolt fastener is used for fixing a connecting piece (5) and comprises a bolt (1), a bolt sleeve (2), a large washer (3) and a large nut (4), wherein the bolt sleeve (2) is sleeved on the bolt (1) respectively, the bolt sleeve (2) is arranged in a mounting hole (5a), the head of the bolt (1), the large washer (3) and the large nut (4) are arranged on two sides of the connecting piece (5) respectively to fasten and mount the connecting piece (5), and the T-shaped unilateral bolt fastener is characterized in that the bolt (1) comprises a bolt head (1a) and a bolt rod (1b) which are connected with each other, the cross sections of the mounting hole (5a) and the bolt sleeve (2) are the same as the cross section of the bolt head (1a), and the bolt head (1a) is tightly clamped with the mounting hole (5a) after rotating by taking the bolt rod (1b) as an axis;
when this unilateral bolt fastener of installation, set up on connecting piece (5) with bolt head (1a) complex mounting hole (5a), bolt cover (2), big packing ring (3) and big nut (4) overlap in proper order and locate on shank of bolt (1b), bolt head (1a) and bolt cover (2) coincide each other, push into mounting hole (5a) jointly, bolt head (1a) rotatory set angle after, pull-back bolt (1), bolt head (1a) stagger with mounting hole (5a), the part of staggering supports connecting piece (5) inside wall, screws up big nut (4), accomplishes the installation.
2. The T-shaped unilateral bolt fastener according to claim 1, wherein the bolt head (1a) is of an A-shaped flat key structure and is integrally formed by two side semi-cylinders and a middle cuboid, the bolt rod (1b) extends out of the centroid of the cross section of the bolt head (1a), the tail of the bolt rod is provided with an external thread matched with the large nut (4), and the bolt head (1a) and the bolt rod (1b) are matched with each other to form the T-shaped bolt.
3. The T-shaped unilateral bolt fastener according to claim 2, wherein the middle of one surface of the bolt sleeve (2) is provided with a positioning groove (2a) along the width direction, the width of the positioning groove (2a) is larger than or equal to the width of the middle of the bolt head (1a), a through hole (2b) is formed in the bottom of the positioning groove (2a), and the diameter of the through hole (2b) is larger than the nominal diameter of the bolt rod (1 b).
4. A T-shaped single-sided bolt fastener according to claim 3, characterized in that the top of the two side walls of the positioning slot (2a) is provided with a chamfer (2 c).
5. The T-shaped unilateral bolt fastener according to claim 4, wherein the chamfer (2c) at the top of the two side walls of the positioning groove (2a) is a 45-degree chamfer with a depth ranging from 1mm to 2 mm.
6. A T-shaped single-sided bolt fastener according to claim 3, characterized in that the maximum thickness of the bolt sleeve (2) is greater than the clamping length of the connecting piece (5) and the minimum thickness is less than the clamping length of the connecting piece (5).
7. The T-shaped unilateral bolt fastener according to claim 6, wherein the maximum thickness of the bolt sleeve (2) is 5-8 mm greater than the clamping length of the connecting piece (5), the groove depth of the positioning groove (2a) is 7-10 mm, and the width of the positioning groove (2a) is 1mm greater than the width of the middle of the bolt head (1 a).
8. A T-shaped unilateral screw fastener according to claim 2, characterized in that the outer diameter of the large washer (3) is larger than the width of the installation hole (5a) and the inner diameter is larger than the nominal diameter of the screw thread of the screw shank (1 b).
9. The T-shaped unilateral bolt fastener according to claim 3, wherein the set angle is 90 degrees, when the bolt head (1a) penetrates through the installation hole (5a), the bolt sleeve (2) enters the installation hole (5a), the bolt head (1a) is rotated by 90 degrees, the bolt (1) is pulled back, the middle of the bolt head (1a) is clamped into the positioning groove (2a), the semi-cylinders at two ends abut against the inner side wall of the connecting piece (5), the bolt head (1a), the installation hole (5a) and the bolt sleeve (2) form a cross shape, and finally the large nut (4) is screwed to complete installation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911184584.1A CN111059125A (en) | 2019-11-27 | 2019-11-27 | T-shaped unilateral bolt fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911184584.1A CN111059125A (en) | 2019-11-27 | 2019-11-27 | T-shaped unilateral bolt fastener |
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| Publication Number | Publication Date |
|---|---|
| CN111059125A true CN111059125A (en) | 2020-04-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911184584.1A Pending CN111059125A (en) | 2019-11-27 | 2019-11-27 | T-shaped unilateral bolt fastener |
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| Country | Link |
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| CN (1) | CN111059125A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113668101A (en) * | 2021-10-25 | 2021-11-19 | 常州金德纺机科技有限公司 | Quick-mounting leather collar frame |
| CN114658739A (en) * | 2022-04-06 | 2022-06-24 | 中建八局第四建设有限公司 | Long-circular-hole friction type one-way T-shaped high-strength bolt and using method thereof |
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| CN201053430Y (en) * | 2007-05-29 | 2008-04-30 | 胡小萍 | Quick fastening device |
| CN102829057A (en) * | 2012-08-31 | 2012-12-19 | 张国英 | Connecting structure of bracket type T-shaped bolt and steel structure |
| CN205956161U (en) * | 2016-08-29 | 2017-02-15 | 中国铁建电气化局集团第五工程有限公司 | T -shaped bolt |
| CN206943180U (en) * | 2017-05-04 | 2018-01-30 | 温州展博实业有限公司 | The T-bolt of convenient disassembly |
| CN207049170U (en) * | 2017-07-25 | 2018-02-27 | 苏州新益泰运动科技有限公司 | A kind of protection device |
| CN208951075U (en) * | 2018-10-24 | 2019-06-07 | 北京铁道工程机电技术研究所股份有限公司 | A kind of bolt and jig |
| US20190249571A1 (en) * | 2018-02-15 | 2019-08-15 | United Technologies Corporation | Exhaust liner deflection limiter |
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2019
- 2019-11-27 CN CN201911184584.1A patent/CN111059125A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201053430Y (en) * | 2007-05-29 | 2008-04-30 | 胡小萍 | Quick fastening device |
| CN102829057A (en) * | 2012-08-31 | 2012-12-19 | 张国英 | Connecting structure of bracket type T-shaped bolt and steel structure |
| CN205956161U (en) * | 2016-08-29 | 2017-02-15 | 中国铁建电气化局集团第五工程有限公司 | T -shaped bolt |
| CN206943180U (en) * | 2017-05-04 | 2018-01-30 | 温州展博实业有限公司 | The T-bolt of convenient disassembly |
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| US20190249571A1 (en) * | 2018-02-15 | 2019-08-15 | United Technologies Corporation | Exhaust liner deflection limiter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113668101A (en) * | 2021-10-25 | 2021-11-19 | 常州金德纺机科技有限公司 | Quick-mounting leather collar frame |
| CN114658739A (en) * | 2022-04-06 | 2022-06-24 | 中建八局第四建设有限公司 | Long-circular-hole friction type one-way T-shaped high-strength bolt and using method thereof |
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Application publication date: 20200424 |
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