CN111894144A - Connecting structure for eccentric injection-increasing steel bars between prefabricated reinforced concrete components - Google Patents
Connecting structure for eccentric injection-increasing steel bars between prefabricated reinforced concrete components Download PDFInfo
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- CN111894144A CN111894144A CN202010754356.XA CN202010754356A CN111894144A CN 111894144 A CN111894144 A CN 111894144A CN 202010754356 A CN202010754356 A CN 202010754356A CN 111894144 A CN111894144 A CN 111894144A
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- assembling
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- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 title claims description 16
- 239000010959 steel Substances 0.000 title claims description 16
- 238000009434 installation Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000011178 precast concrete Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 4
- 239000004567 concrete Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000003190 augmentative effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
- E04B1/4114—Elements with sockets
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention relates to an eccentric injection-increasing reinforcing steel bar connecting structure between prefabricated reinforced concrete components, which comprises an eccentric expanding screw head, split assembling strips, a combined lantern ring and an inner joint bearing body, wherein the eccentric expanding screw head is connected with the split assembling strips; the eccentric expanding screw head comprises a screw rod body and an expanding screw rod body eccentrically connected to the end part of the screw rod body; a plurality of split assembling strips are spliced into a hollow cylindrical body, and internal threads are respectively arranged on the inner side surfaces of the upper end part and the lower end part of the hollow cylindrical body; a combined lantern ring is sleeved on the hollow cylindrical body; a grouting slot hole leading to the inner cavity of the hollow cylindrical body is formed in the hollow cylindrical body; the inner joint bearing body is arranged in the inner cavity of the hollow cylindrical body; the periphery of the hollow cylindrical body provided with the inner joint bearing body is correspondingly sleeved with a combined lantern ring; the combined lantern ring comprises a bearing ring, a split arc-shaped pad and a split arc-shaped wedge. When the invention is used for connecting prefabricated reinforced concrete members, the invention not only has stronger connecting and bearing capacity, but also has stronger position deviation adaptability, and can adapt to larger position deviation of two connecting ends.
Description
Technical Field
The invention relates to the field of buildings, in particular to an eccentric injection-increasing reinforcing steel bar connecting structure between prefabricated reinforced concrete components.
Background
The assembled concrete member is prefabricated in factory with the integral concrete member divided into several parts and assembled into integral assembled structure in site. Because in the prefabrication process of the assembly type concrete member, the stressed reinforcing steel bar can be accurately reserved. When the assembled concrete member is assembled on site, the adjacent assembled concrete members are connected according to the specification through the steel bar connecting structure, so that the assembled concrete member can be firmly connected, the force transmission is reliable, and the construction is convenient and quick. Meanwhile, the connecting part can bear all loads generated in the installation process before concrete pouring, and the construction is safe and reliable.
Because some prefabricated component bodies are heavy in weight and long in height, such as concrete columns. When the prefabricated member is assembled, the stress of the steel bars at the connecting nodes is far greater than that of the steel bars in the prefabricated member, so that a steel bar connecting structure capable of being stressed more strongly is required. In addition, no matter how fine the installation and prefabricated component management are, there is positional deviation in the reservation link on two rigging component, the problem that can't the counterpoint connection appears easily, also requires that the steel reinforcement coupling structure can adapt to positional deviation's ability promptly.
Disclosure of Invention
In view of the above problems, the present invention provides an eccentric augmented injection steel bar connection structure between prefabricated reinforced concrete members, which has strong connection and bearing capabilities and strong position deviation adaptability when used for connecting the prefabricated reinforced concrete members, and can adapt to the large position deviation of two connection ends.
The technical scheme of the invention is as follows: the utility model provides an eccentric injection reinforcing bar connection structure that increases between precast reinforced concrete component, includes eccentric hole enlargement spiral shell head, split concatenation strip, combination lantern ring and interior festival support body, wherein:
the eccentric expanding screw head comprises a screw body matched with a pre-embedded screw barrel on the precast concrete component and an expanding screw body eccentrically connected to the end part of the screw body; the side parts of the screw rod body and the diameter-expanding screw rod body are tangent, and the screw rod body and the diameter-expanding screw rod body are inscribed circles when viewed from a top view; the screw rod body and the diameter-expanding screw rod body are of an integrated forming structure; a chamfer is arranged at the joint of the screw rod body and the diameter-expanding screw rod body, and preferably, the chamfer is an arc chamfer; and an operation part for driving the diameter-expanding screw rod body to rotate is arranged on the operation end face of the diameter-expanding screw rod body, and the operation part is an operation counter bore.
The split assembling strips are not less than three, the split assembling strips are assembled into a hollow cylindrical body, and inner side surfaces of the upper end part and the lower end part of the hollow cylindrical body are respectively provided with an internal thread matched with the expanding screw rod body; the outer sides of the upper end part and the lower end part of the hollow cylindrical body are sleeved with combined lantern rings; the outer side surface of the hollow cylindrical body is a conical surface; the split assembling strips forming the hollow cylindrical body are in a group, one split assembling strip in the group is marked as an initial split assembling strip during assembling, and then the rest split assembling strips are sequentially marked and sequentially assembled; and grouting slot holes leading to the inner cavity of the hollow cylindrical body are formed in the splicing joint surface of the adjacent split splicing strips of the hollow cylindrical body. The matching surface of the outer peripheral surface of the hollow cylindrical body and the combined lantern ring is provided with filing grains.
The inner joint bearing body is arranged in the inner cavity of the hollow cylindrical body; when the split assembling strip is installed, the inner joint bearing body is inserted on the clamping body on the inner side surface of the initial split assembling strip; the clamping body is a fishtail tenon; the periphery of the hollow cylindrical body provided with the inner joint bearing body is correspondingly sleeved with a combined lantern ring. The inner joint bearing body is a solid cylindrical body or a cylindrical body assembled in a split mode; when the solid cylindrical body is formed by assembling a plurality of split parts, one split part assembling body and the initial split part assembling strip are connected through the clamping body to form a standard initial split part assembling strip; the remaining split assembling strips with split assembling bodies are sequentially assembled by taking the standard initial split assembling strip as a reference, so that the aim of assembling quickly and accurately is fulfilled; the split assembling strip is provided with no clamping body on the inner wall except the inner wall of the initial split assembling strip.
The combined lantern ring is mainly used for surrounding and connecting the split assembling strips to form a stable hollow cylindrical body; the combined lantern ring comprises a bearing ring, a split arc-shaped pad and a split arc-shaped wedge; the bearing ring is sleeved on the periphery of the hollow cylindrical body, an installation operation space is reserved between the bearing ring and the hollow cylindrical body, and the operation space is filled and wedged and fixed through the split arc-shaped pad and the split arc-shaped wedge; the split arc-shaped pad is assembled on the inner side surface of the bearing ring, and the split arc-shaped wedge is wedged on a space between the split arc-shaped pad and the hollow cylindrical body, so that the combined lantern ring can be fastened on the hollow cylindrical body; the splicing surfaces of two adjacent split arc-shaped pads are step-shaped splicing surfaces; the inner side surface of the split arc-shaped pad is a wedge surface and is provided with rasps; the upper end and the lower end of the split arc-shaped pad are provided with horizontal outer edges so as to be matched with the force bearing ring; the number of the split arc-shaped wedges is the same as that of the split arc-shaped pads, and gaps between the adjacent split arc-shaped pads and gaps between the adjacent split arc-shaped wedges are staggered.
The invention has the beneficial effects that: when the invention is used for connecting prefabricated reinforced concrete members, the invention not only has stronger connecting and bearing capacity, but also has stronger position deviation adaptability, and can adapt to larger position deviation of two connecting ends.
Drawings
Fig. 1 is a schematic structural view of an eccentric injection-increasing reinforcing steel bar connection structure between prefabricated reinforced concrete members in the embodiment.
Fig. 2 is a front view structure schematic diagram of the eccentric expanding screw head in the embodiment.
Fig. 3 is a schematic top view of the eccentric expanding screw head in the embodiment.
Fig. 4 is a schematic view of the end face structure a-a in fig. 1.
In the figure:
1-eccentric expanding screw head 1.1-screw body 1.2-expanding screw body 1.3-chamfer 1.4-operation counter bore;
2-split assembling strip 2.1-internal thread 2.2-grouting slotted hole 2.3-file pattern 2.4-clamping body;
3-combined lantern ring 3.1-bearing ring 3.2-split arc pad 3.21-horizontal outer edge 3.22-step splicing face 3.3-split arc wedge;
4-inner joint bearing body;
5, prefabricating a reinforced concrete member; 5.1-embedding a screw cylinder.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
As shown in fig. 1, the eccentric injection-increasing steel bar connection structure between prefabricated reinforced concrete components of the invention comprises an upper eccentric expanding screw head 1, a lower eccentric expanding screw head 1, three split assembling strips 2, three combined lantern rings 3 and an inner section bearing body 4, wherein:
taking the eccentric expanding screw head 1 positioned above as an example, as shown in fig. 2 and 3, the eccentric expanding screw head 1 comprises a screw body 1.1 matched with a pre-embedded screw barrel 5.1 on a precast concrete member 5 and an expanding screw rod body 1.2 eccentrically connected at the lower end part of the screw body 1.1; the screw body 1.1 and one side part of the diameter-expanding screw body 1.2 are tangent, and as shown in fig. 3, the two are two inscribed circles when viewed from the top; the screw body 1.1 and the diameter-expanding screw body 1.2 are of an integrated forming structure; a chamfer 1.3 is arranged at the joint of the screw rod body 1.1 and the diameter-expanding screw rod body 1.2, and the chamfer 1.3 is an arc chamfer; an operation part for driving the diameter-expanding screw rod body 1.2 to rotate is arranged on the operation end face of the diameter-expanding screw rod body, and the operation part is an operation counter bore 1.4.
As shown in fig. 1 and 4, the split assembling strips 2 are three, the three split assembling strips are spliced into a hollow cylindrical body, and inner side surfaces of the upper end part and the lower end part of the hollow cylindrical body are respectively provided with an internal thread 2.1 matched with an expanding screw body 1.2; a combined lantern ring 3 is sleeved outside the upper end part and the lower end part of the hollow cylindrical body; the outer side surface of the hollow cylindrical body is a conical surface, and particularly as shown in figure 1, the hollow cylindrical body is a conical hollow cylindrical body with a small upper part and a large lower part; the three split assembling strips forming the hollow cylindrical body form a group, one split assembling strip in the group is marked as an initial split assembling strip during assembling, and then the remaining two split assembling strips are sequentially marked and sequentially assembled; and a grouting groove hole 2.2 leading to the inner cavity of the hollow cylindrical body is formed in the splicing joint surface of the adjacent split splicing strips of the hollow cylindrical body. The matching surface of the outer peripheral surface of the hollow cylindrical body and the combined lantern ring 3 is provided with filing grains 2.3.
As shown in fig. 1 and 4, the combined lantern ring 3 comprises a bearing ring 3.1, a split arc-shaped pad 3.2 and a split arc-shaped wedge 3.3; the bearing ring 3.1 is sleeved on the periphery of the hollow cylindrical body, an installation operation space is reserved between the bearing ring and the hollow cylindrical body, and the operation space is filled and wedged through a split arc-shaped pad 3.2 and a split arc-shaped wedge 3.3; the split arc-shaped pad 3.2 is assembled on the inner side surface of the bearing ring 3.1, and the split arc-shaped wedge 3.3 is wedged on the space between the split arc-shaped pad and the hollow cylindrical body, so that the combined lantern ring 3 can be fastened on the hollow cylindrical body; the splicing surface of two adjacent split arc-shaped pads 3.2 is a step-shaped splicing surface 3.22; the inner side surface of the split arc-shaped pad 3.2 is a wedge surface and is provided with rasp lines; the upper end and the lower end of the split arc-shaped pad 3.2 are provided with horizontal outer edges 3.21 so as to be matched with a bearing ring; the number of the split arc-shaped wedges is the same as that of the split arc-shaped pads, and the number of the split arc-shaped wedges is three; gaps between adjacent split arc-shaped pads and gaps between adjacent split arc-shaped wedges are staggered.
As shown in fig. 1 and 4, the inner socket body 4 is arranged in the middle inner cavity of the hollow cylindrical body; when the hollow cylindrical body is long, a plurality of inner joint bodies 4 can be installed in the inner cavity of the hollow cylindrical body at intervals. When the split assembling strip is installed, the connecting clamping groove on the inner joint bearing body 4 is inserted into the clamping body 2.4 on the inner side surface of the initial split assembling strip; the clamping body 2.4 is a fishtail tenon; the periphery of the hollow cylindrical body provided with the inner socket body 4 is correspondingly sleeved with the combined lantern ring 3. The inner joint bearing body 4 is formed by assembling and splicing three split parts, wherein one split part assembling body is connected with the initial split part assembling strip through a clamping body to form a standard initial split part assembling strip; the remaining split assembling strips with split assembling bodies are sequentially assembled by taking the standard initial split assembling strip as a reference, so that the aim of assembling quickly and accurately is fulfilled.
When in use, the upper eccentric expanding screw head and the lower eccentric expanding screw head 1 are respectively and correspondingly arranged on the embedded screw cylinders of the two prefabricated reinforced concrete components 5.1; the three bearing rings 3.1 are sequentially arranged from top to bottom and sleeved on the periphery of the upper eccentric expanding screw head 1; from the standard initial split assembling strip, sequentially assembling the split assembling strips one by one to form a hollow cylindrical body, and ensuring that the internal threads 2.1 at the upper end and the lower end of the hollow cylindrical body are accurately matched with the diameter-expanding screw rod body 1.2; then the bearing ring 3.1 positioned at the lowest part slides down to the part of the lower end of the hollow cylindrical body matched with the lower eccentric expanding screw head 1, the split arc-shaped pad 3.2 is assembled at the inner side surface of the bearing ring 3.1, and the split arc-shaped wedge 3.3 is wedged tightly on the space between the split arc-shaped pad and the hollow cylindrical body, so that the combined lantern ring 3 can be fastened on the hollow cylindrical body to finish the fastening of the lower end head of the hollow cylindrical body; then, the intermediate composite collar 3 and the upper composite collar 3 of the hollow cylindrical body are sequentially fastened according to the fastening method.
When the invention is used for connecting prefabricated reinforced concrete members, the invention not only has stronger connecting and bearing capacity, but also has stronger position deviation adaptability, and can adapt to larger position deviation of two connecting ends.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The utility model provides an eccentric injection reinforcing bar connection structure that increases between precast reinforced concrete component which characterized in that: comprises an eccentric expanding screw head, split assembling strips, a combined lantern ring and an inner joint bearing body;
the eccentric expanding screw head comprises a screw body matched with a pre-embedded screw barrel on the precast concrete component and an expanding screw body eccentrically connected to the end part of the screw body; an operating part for driving the diameter-expanding screw rod body to rotate is arranged on the operating end face of the diameter-expanding screw rod body;
at least three split assembling strips are arranged, a plurality of split assembling strips are spliced into a hollow cylindrical body, and inner side surfaces of the upper end part and the lower end part of the hollow cylindrical body are respectively provided with an internal thread matched with the expanding screw rod body; the outer sides of the upper end part and the lower end part of the hollow cylindrical body are sleeved with combined lantern rings; a grouting slot hole leading to the inner cavity of the hollow cylindrical body is formed in the hollow cylindrical body;
the inner joint bearing body is arranged in the inner cavity of the hollow cylindrical body; the periphery of the hollow cylindrical body provided with the inner joint bearing body is correspondingly sleeved with a combined lantern ring; the inner joint bearing body is a solid cylindrical body or a cylindrical body assembled in a split mode;
the combined lantern ring comprises a bearing ring, a split arc-shaped pad and a split arc-shaped wedge; the bearing ring is sleeved on the periphery of the hollow cylindrical body, an installation operation space is reserved between the bearing ring and the hollow cylindrical body, and the operation space is filled and wedged and fixed through the split arc-shaped pad and the split arc-shaped wedge; the split arc-shaped pad is assembled on the inner side surface of the bearing ring, and the split arc-shaped wedge is wedged on a space between the split arc-shaped pad and the hollow cylindrical body, so that the combined lantern ring can be fastened on the hollow cylindrical body.
2. The eccentric injection-augmented steel bar linkage structure between precast reinforced concrete components of claim 1, which is characterized in that: the side parts of the screw rod body and the diameter-expanding screw rod body are tangent; the screw rod body and the diameter-expanding screw rod body are of an integrated forming structure; a chamfer is arranged at the joint of the screw rod body and the diameter-expanding screw rod body; the operation part is an operation counter bore.
3. The eccentric injection-augmented steel bar linkage structure between precast reinforced concrete components of claim 1, which is characterized in that: the outer side surface of the hollow cylindrical body is a conical surface.
4. The eccentric injection-augmented steel bar linkage structure between precast reinforced concrete components of claim 1, which is characterized in that: the split assembling strips forming the hollow cylindrical body are in a group, one split assembling strip in the group is marked as an initial split assembling strip during assembling, and then the rest split assembling strips are sequentially marked and sequentially assembled.
5. The eccentric injection-augmented steel bar linkage structure between precast reinforced concrete components of claim 4, wherein: the inner joint bearing body is inserted on the clamping body on the inner side surface of the initial split assembling strip.
6. The eccentric injection-augmented steel bar linkage structure between precast reinforced concrete components of claim 1, which is characterized in that: the matching surface of the outer peripheral surface of the hollow cylindrical body and the combined lantern ring is provided with filing grains.
7. The eccentric injection-augmented steel bar linkage structure between precast reinforced concrete components of claim 1, which is characterized in that: the splicing surfaces of two adjacent split arc-shaped pads are step-shaped splicing surfaces; the inner side surface of the split arc-shaped pad is a wedge surface and is provided with rasps; the upper end and the lower end of the split arc-shaped pad are provided with horizontal outer edges so as to be matched with the force bearing ring; the number of the split arc-shaped wedges is the same as that of the split arc-shaped pads, and gaps between the adjacent split arc-shaped pads and gaps between the adjacent split arc-shaped wedges are staggered.
8. The eccentric injection-augmented steel bar linkage structure between precast reinforced concrete components of claim 4, wherein: when the solid cylindrical body is formed by assembling a plurality of split parts, one split part assembling body and the initial split part assembling strip are connected through the clamping body to form a standard initial split part assembling strip; the remaining split assembling strips with split assembling bodies are sequentially assembled by taking the standard initial split assembling strip as a reference, so that the aim of assembling quickly and accurately is fulfilled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010754356.XA CN111894144A (en) | 2020-07-30 | 2020-07-30 | Connecting structure for eccentric injection-increasing steel bars between prefabricated reinforced concrete components |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010754356.XA CN111894144A (en) | 2020-07-30 | 2020-07-30 | Connecting structure for eccentric injection-increasing steel bars between prefabricated reinforced concrete components |
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| Publication Number | Publication Date |
|---|---|
| CN111894144A true CN111894144A (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010754356.XA Withdrawn CN111894144A (en) | 2020-07-30 | 2020-07-30 | Connecting structure for eccentric injection-increasing steel bars between prefabricated reinforced concrete components |
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| CN (1) | CN111894144A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6489334A (en) * | 1987-09-29 | 1989-04-03 | Nec Corp | Semiconductor integrated circuit device |
| CN2464827Y (en) * | 2000-12-11 | 2001-12-12 | 谢军 | Screw steel bar connector |
| CN105781019A (en) * | 2016-03-22 | 2016-07-20 | 济南陆枋志合信息技术有限公司 | All-grouting sleeve for assembled building reinforcement connection and grouting method |
| CN106245851A (en) * | 2016-08-01 | 2016-12-21 | 福州市第三建筑工程公司 | Steel reinforcement abutting joints structure and docking calculation thereof and application in a kind of reinforced concrete |
| CN208578260U (en) * | 2018-06-29 | 2019-03-05 | 周兆弟 | Transverse connection structure part |
| CN110258934A (en) * | 2018-08-17 | 2019-09-20 | 李藏柱 | A kind of sleeve connection structure and sleeve with swelling device |
| CN210509885U (en) * | 2019-09-30 | 2020-05-12 | 广西安盾交通科技有限公司 | Eccentric bolt |
| WO2020116666A1 (en) * | 2018-12-07 | 2020-06-11 | 利光 徳元 | Lock bolt |
-
2020
- 2020-07-30 CN CN202010754356.XA patent/CN111894144A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6489334A (en) * | 1987-09-29 | 1989-04-03 | Nec Corp | Semiconductor integrated circuit device |
| CN2464827Y (en) * | 2000-12-11 | 2001-12-12 | 谢军 | Screw steel bar connector |
| CN105781019A (en) * | 2016-03-22 | 2016-07-20 | 济南陆枋志合信息技术有限公司 | All-grouting sleeve for assembled building reinforcement connection and grouting method |
| CN106245851A (en) * | 2016-08-01 | 2016-12-21 | 福州市第三建筑工程公司 | Steel reinforcement abutting joints structure and docking calculation thereof and application in a kind of reinforced concrete |
| CN208578260U (en) * | 2018-06-29 | 2019-03-05 | 周兆弟 | Transverse connection structure part |
| CN110258934A (en) * | 2018-08-17 | 2019-09-20 | 李藏柱 | A kind of sleeve connection structure and sleeve with swelling device |
| WO2020116666A1 (en) * | 2018-12-07 | 2020-06-11 | 利光 徳元 | Lock bolt |
| CN210509885U (en) * | 2019-09-30 | 2020-05-12 | 广西安盾交通科技有限公司 | Eccentric bolt |
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Application publication date: 20201106 |
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