CN113481815A - Multiple-protection concrete composite bridge and manufacturing method thereof - Google Patents
Multiple-protection concrete composite bridge and manufacturing method thereof Download PDFInfo
- Publication number
- CN113481815A CN113481815A CN202110708493.4A CN202110708493A CN113481815A CN 113481815 A CN113481815 A CN 113481815A CN 202110708493 A CN202110708493 A CN 202110708493A CN 113481815 A CN113481815 A CN 113481815A
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- plug
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- nut
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- 239000004567 concrete Substances 0.000 title claims abstract description 54
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 47
- 239000010959 steel Substances 0.000 claims abstract description 47
- 230000004224 protection Effects 0.000 claims abstract description 10
- 238000010008 shearing Methods 0.000 claims abstract description 5
- 239000011178 precast concrete Substances 0.000 claims description 21
- 238000005266 casting Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 3
- 239000011440 grout Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 4
- 238000009417 prefabrication Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
A multi-protection concrete composite bridge comprises a steel beam and a concrete bridge plate, wherein the concrete bridge plate is arranged on the steel beam, a plate hole is formed in the concrete bridge plate, a connector is arranged in the plate hole, and the steel beam and the concrete bridge plate are connected in a shearing mode through the connector; the connector includes that bolt, dull and stereotyped bag and symmetry are located plug on the dull and stereotyped bag, the bolt lower part with girder steel fixed connection, the bolt passes the plug, the plug is located in the dull and stereotyped bag, the dull and stereotyped bag is located the downthehole board, the upper end and the upper portion hexagon nut fixed connection of bolt. And provides a manufacturing method of the concrete composite bridge with multiple protections. The invention improves the connection between the concrete bridge plate and the steel beam, thereby prolonging the service life.
Description
Technical Field
The invention belongs to the field of concrete composite bridges, and particularly relates to a multiple-protection concrete composite bridge and a manufacturing method thereof.
Background
Over the past two decades, rapid bridge aging has become a major problem for a variety of reasons, including increased traffic flow; allowable vehicle weight increase compared to the vehicle considered in the original design; the use of de-icing salts, especially in the climatic cold in some countries; the construction materials are of poor quality and many bridges in various countries of the world are affected by the above factors. Traditionally, the connection between a steel beam and a bridge deck is realized through shear force studs, the shear force studs are welded on the top flange of the steel beam, the expected effect sometimes cannot be achieved only by unilateral shear force connection, and the interface of a combined beam bridge is easy to break away under the action of external load, so that the durability and the mechanical property of the structure are greatly reduced; under the action of reciprocating vehicle load, the combined beam bridge adopting the high-strength bolt as the shear key is easy to have local looseness of an interface, the working mechanism of the high-strength bolt is changed from a friction type to a pressure bearing type, and a bolt rod is directly contacted with the wall of a flange bolt hole on a steel beam, so that the shearing resistance and the durability of the structure are influenced. In summary, a multi-safety connection is required to protect the safety and durability of the interface shear key and avoid local deformation and looseness, so as to improve the connection effect.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a multiple-protection concrete composite bridge and a manufacturing method thereof, which can improve the connection between a concrete bridge plate and a steel beam and further prolong the service life.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a compound bridge of concrete of multiple protection, includes girder steel and concrete bridge slab, the concrete bridge slab is located on the girder steel, its characterized in that: the concrete bridge plate is provided with plate holes, connectors are arranged in the plate holes, and the steel beam and the concrete bridge plate are connected in a shearing mode through the connectors; the connector includes that bolt, dull and stereotyped bag and symmetry are located plug on the dull and stereotyped bag, the bolt lower part with girder steel fixed connection, the bolt passes the plug, the plug is located in the dull and stereotyped bag, the dull and stereotyped bag is located the downthehole board, the upper end and the upper portion hexagon nut fixed connection of bolt.
Further, the bolts are fastened to the top flange on the steel beam using a double nut structure; the upper portion of the bolt hole of the steel beam is provided with a countersunk seat, an upper portion conical nut is located in the countersunk seat, the upper portion conical nut is sleeved on the bolt, and the bolt penetrates through the bolt hole and the top flange downwards and then is fixedly connected with a lower portion hexagonal nut.
The chamfer side of the countersunk seat forms an angle of 60 degrees, the upper conical nut is a standard nut screwed on the bolt, and the geometric shape of the upper conical nut follows the same angle of 60 degrees. And thus can be mounted in a receptacle seat. The upper taper nut locks in the bolt hole, which prevents the bolt from slipping in the bolt hole.
Preferably, the upper tapered nut portion will enter the spigot, thereby increasing the contact area of the nut with the surrounding concrete, thereby delaying the breaking of the concrete.
Preferably, the internal thread of the upper cone nut is removed by 5 mm, the bolt portion is hidden within the cone nut and prevents shear failure within its weak thread length.
Further, the upper hex nut is used with a beveled washer and a tension indicator washer to apply a certain load between the lower hex nut and the upper tapered nut, such as 88-106k N of the M16 bolt, representing 70% of its limit capacity, to ensure a secure locking configuration to prevent the bolt from slipping within its bore.
Preferably, each plug has a central circular hole of 26mm diameter to accommodate a 10mm M16 bolt.
Preferably, the diameter of the central circular hole is increased from 26mm to 40 mm at the bottom of the spigot to accommodate a M16 taper nut with a clearance of 10 mm. The dimensions of the spigot ensure that shear forces are transferred from the connector to the slab, avoiding the risk of premature longitudinal shear failure and/or slab splitting. Furthermore, the diameter of the plug is small enough compared to the diameter of the flat bag to overcome tolerance problems typically encountered during the construction of prefabricated bridges; grout is used for filling the clearance between bolt and the plug hole and the clearance between plug and the flat bag.
Preferably, for the connector, a normal strength quick hardening grout may be used, which flows into the gap without flowing out. The height of the plug is 115 mm, i.e. less than 150mm of the flat bag, to allow additional covering or waterproof grouting.
Preferably, the upper hexagonal nut is tightened before the grout hardens to avoid internal stresses in the slab. Thus, even if the interface of the steel beam concrete bridge plate is imperfect, the bolt tightening can not lead to the plate breaking.
Preferably, by using a different number of bolts, different configurations of connectors may be used. For example, one bolt may be used in one plug in one flat bag to reduce the amount of grout in place, or four bolts may be used in one plug in one flat bag to increase the overall shear strength and, therefore, to reduce the shear connector required along the length of the bridge.
Preferably, the connector allows for quick removal and replacement of any deteriorated structural components of the prefabricated steel-concrete composite bridge. If the precast concrete deck is damaged, the lower hex nut can be removed and the precast panel and its shear connector can be quickly lifted as a whole. If there is no passage under the bridge, the upper hexagonal nut on top of the spigot is removed and the precast concrete bridge plate and its spigot can be quickly lifted by leaving the bolt in place. To achieve this, the bolt is designed such that the thread length of the bolt does not come into contact with the grout. In the event of a few shear connectors being damaged, the plug and its surrounding grout can be quickly pulled out and replaced by first replacing the lower hex nut and then removing the plug and its surrounding grout by applying an upper pulling force with the flat plate as a support.
Preferably, prior to casting the grout, the surfaces of the sheet cavity may be coated with a thin release agent, such as a wax-based material, to facilitate removal of the plug and its surrounding grout. In the event of damage to the steel beams, the accelerated bridge disassembly capability allows the beams to be replaced, while the precast concrete panels and shear connectors can be reused.
Preferably, firm dry joints between the precast concrete panels will further enhance the dismantling capability of the bridge.
The flat bag is provided with a countersink with the inclination of 5 degrees; the plug is an inverted conical precast concrete plug; the inclination angle of the plug is the same as that of the flat bag. According to the method, on one hand, the concrete plug can be well placed in the flat plate strip, a pressure-bearing force can be formed at the beginning of installation by an inclination process, the bolts on the concrete panel and the steel beam are preliminarily fixed, and the plate holes and the bolts can be centered by slight adjustment due to the preliminary fixation, so that the problem of low centering accuracy is prevented, the accumulation of errors and the generation of dislocation are prevented, and the integrity between the bridge and the precast concrete panel is finally improved; the bolts are fixed on the steel beam in a double-locking nut mode, wherein when the precast concrete panel and the steel beam are assembled, the chamfer angle of the upper conical nut enters the countersunk seat, friction type connection is realized, the protection effect is improved, on the basis of friction type, after grouting, all gaps in the plate hole are filled, and the gaps between the bolts and the plug are also filled, so that pressure bearing type connection is formed, the connection effect is improved through the filling between the bolts and the precast concrete plug, and the connection effect is further realized through the multiple connection relationship of pressure bearing connection and friction connection, so that the stability between the concrete panel and the steel beam is improved through the connector, the service life of the invention is prolonged, and the invention is safer and more reliable.
A method of manufacturing a multiple protection concrete composite bridge, the method comprising the steps of:
(1) prefabricating a concrete bridge plate in a factory, and punching the prefabricated concrete bridge plate;
(2) positioning the bolt on the steel beam by fixing the double-lock nut configuration;
(3) casting a conical precast concrete plug to form a plug, and prefabricating a flat bag which can be matched with the plug through a template;
(4) carrying out final assembly between the precast slabs and the steel beams on site;
(5) each precast concrete bridge plate is positioned at the top of the steel beam;
(6) aligning each pair of bolts with the center of a plate hole;
(7) then pouring the fast-hardening grouting into the plate holes until a certain depth is reached;
(8) then, the plug is placed in the plate hole, so that the plug is sleeved on the bolt;
(9) enabling each bolt to surround one plug, and then sleeving a flat bag on the plug;
(10) filling gaps between the bolt and the plug hole and between the plug and the flat bag by grouting;
(11) then the plug is fixed in place by screwing the hexagonal nut on the upper part;
(12) and finally hardening the grouting.
The invention has the following beneficial effects: by disassembling the bridge without affecting structural integrity and efficiency; rapid bridge disassembly will provide the unique advantage of easy replacement of deteriorated structural components, and therefore will extend the service life of the bridge at minimal cost and traffic disturbances; for steel concrete composite bridges, the disassembly of the bridge requires detachable shear connectors to easily separate the deck from the steel beam without affecting the composite action.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a cross-sectional perspective view of fig. 2 taken along a-a.
Fig. 4 is an exploded view of the connector of the present invention.
Fig. 5 is an enlarged view of a portion a in fig. 3.
FIG. 6 is an enlarged view of FIG. 5 at B
Fig. 7 is a schematic view of an upper cone nut according to the present invention.
As shown in fig. 1-7, wherein: 1 is a steel beam, 11 is a concrete bridge, 12 is a plate hole, 13 is a connector, 14 is a flat bag, 15 is a plug, 16 is an upper hexagonal nut, 17 is a bolt, 18 is a top flange, 19 is a bolt hole, 20 is a counter-sunk seat, 21 is a lower hexagonal nut, and 22 is an upper tapered nut.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 7, the multiple protection concrete composite bridge comprises a steel beam 1 and a concrete bridge plate 11, wherein the concrete bridge plate 11 is arranged on the steel beam 1, plate holes 12 are formed in the concrete bridge plate 11, and the plate holes 12 are linearly distributed along the concrete bridge 11.
Specifically, the steel beam 1 and the concrete are connected in a shearing mode through a connector 13; the connectors 13 are provided on the plate holes 12.
The concrete bridge 11 is composed of precast concrete plates.
The connector 13 comprises a bolt 17, a flat bag 14 and a plug 15, and the plug 15 is symmetrically arranged on the flat bag 14.
Further, a bolt 17 may be inserted onto the plug 15; the bolts 17 are fastened to the top flange 18 on the steel beam 1 using a double nut structure.
The steel beam 1 is also provided with bolt holes 19. The upper part of the bolt hole 19 is provided with a counter sink seat 20. The double nut arrangement is tightened by a lower hexagonal nut 21 and an upper tapered nut 22.
Further, if the precast concrete panel is damaged, the lower hexagonal nut 21 may be removed and then the precast panel and its shear connector 13 may be quickly lifted as a whole. If there is no passage under the bridge, the upper hexagonal nut at the top of the plug is removed and the prefabricated panel and its plug can be quickly lifted by leaving the bolts 17 in place.
A manufacturing method of a multiple-protection concrete composite bridge comprises the following steps:
(1) prefabricating a concrete slab in a factory, and punching the prefabricated concrete slab;
(2) positioning the bolt 17 on the steel beam 1 by fixing the double lock nut arrangement;
(3) casting a conical precast concrete plug as a plug 15, and prefabricating a flat bag which can be matched with the plug through a template;
(4) carrying out final assembly between the precast slabs and the steel beams on site;
(5) each precast concrete deck is positioned at the top of the steel beam 1;
(6) with each pair of bolts 17 generally aligned with the center of the plate holes 12;
(7) then pouring the fast-hardening grout into the plate holes 12 to a certain depth;
(8) then, the plug is placed in the plate hole 12, so that the plug is sleeved on the bolt;
(9) each bolt 17 is made to surround one plug, and then the flat bag is sleeved on the plug;
(10) filling gaps between the bolt and the plug hole and between the plug and the flat bag by grouting;
(11) the plug 15 is then secured in place by tightening the upper hexagonal nut 16;
(12) and finally hardening the grouting.
During specific operation, can carry out the prefabrication of all structural component in the workshop, namely, processing conical nut, drill the chamfer hole, fix bolt 17 location on girder steel 1 through fixed two lock nut configurations, cast precast concrete stopper, go out the dull and stereotyped bag that can fill up the looks adaptation with precast concrete through the template prefabrication. Final assembly between the precast slabs and the steel beam 1 is carried out on site; precast concrete panels with a geometry of 650 x 600 x 150mm and a central countersunk conical pocket, grout is poured into the slab pocket, and then a precast plug is placed around each bolt 17 and gradually inserted into the slab pocket to ensure that all gaps are filled with grout without leaving any voids. The connector 13 specimen is completed by tightening the upper hex nut 16 over each plug. After all the nuts above the plug are tightened, all the bolts 17 are made to have approximately the same tension; each precast concrete deck is located on top of the steel beam 1 so that each pair of bolts 17 is approximately aligned with the centre of the slab cavity. The fast-hardening grout is then poured into the slab bag to a certain depth, then plugs are placed into the slab bag so that each plug surrounds one bolt 17 and all gaps are filled with grout, then the plug 15 is secured in place by tightening the upper hexagonal nut 16 and the grout finally hardens.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, which are intended for purposes of illustration only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.
Claims (8)
1. The utility model provides a compound bridge of concrete of multiple protection, includes girder steel and concrete bridge slab, the concrete bridge slab is located on the girder steel, its characterized in that: the concrete bridge plate is provided with plate holes, connectors are arranged in the plate holes, and the steel beam and the concrete bridge plate are connected in a shearing mode through the connectors; the connector includes that bolt, dull and stereotyped bag and symmetry are located plug on the dull and stereotyped bag, the bolt lower part with girder steel fixed connection, the bolt passes the plug, the plug is located in the dull and stereotyped bag, the dull and stereotyped bag is located the downthehole board, the upper end and the upper portion hexagon nut fixed connection of bolt.
2. The multi-protection concrete composite bridge according to claim 1, wherein: the bolts are fastened to the top flanges on the steel beams using a double nut structure; the upper portion of the bolt hole of the steel beam is provided with a countersunk seat, an upper portion conical nut is located in the countersunk seat, the upper portion conical nut is sleeved on the bolt, and the bolt penetrates through the bolt hole and the top flange downwards and then is fixedly connected with a lower portion hexagonal nut.
3. The multi-protection concrete composite bridge according to claim 2, wherein: the chamfer side of the countersunk seat forms an angle of 60 degrees, the upper conical nut is a standard nut screwed on the bolt, and the geometric shape of the upper conical nut follows the same angle of 60 degrees.
4. The multi-protection concrete composite bridge according to claim 2, wherein: the internal thread of the upper cone nut is removed by 5 mm and the bolt is partially hidden in the cone nut.
5. A multiple protection concrete composite bridge according to any one of claims 1 to 4, characterized in that: the upper hex nut is used with a beveled washer and a tension indicator washer, applying a load between the lower hex nut and the upper tapered nut.
6. A multiple protection concrete composite bridge according to any one of claims 1 to 4, characterized in that: each plug has a central circular hole with a diameter larger than the outer diameter of the bolt and can accommodate a 10mm M16 bolt; the diameter of the central circular hole was increased from 26mm to 40 mm at the bottom of the plug to accommodate a M16 taper nut with a gap of 10 mm.
7. A multiple protection concrete composite bridge according to any one of claims 1 to 4, characterized in that: the flat bag is provided with a countersink with the inclination of 5 degrees; the plug is an inverted conical precast concrete plug; the inclination angle of the plug is the same as that of the flat bag.
8. A method of manufacturing a multiple protection concrete composite bridge according to claim 1, characterized in that: the method comprises the following steps:
(1) prefabricating a concrete bridge plate in a factory, and punching the prefabricated concrete bridge plate;
(2) positioning the bolt on the steel beam by fixing the double-lock nut configuration;
(3) casting a conical precast concrete plug to form a plug, and prefabricating a flat bag which can be matched with the plug through a template;
(4) carrying out final assembly between the precast slabs and the steel beams on site;
(5) each precast concrete bridge plate is positioned at the top of the steel beam;
(6) aligning each pair of bolts with the center of a plate hole;
(7) then pouring the fast-hardening grouting into the plate holes until a certain depth is reached;
(8) then, the plug is placed in the plate hole, so that the plug is sleeved on the bolt;
(9) enabling each bolt to surround one plug, and then sleeving a flat bag on the plug;
(10) filling gaps between the bolt and the plug hole and between the plug and the flat bag by grouting;
(11) then the plug is fixed in place by screwing the hexagonal nut on the upper part;
(12) and finally hardening the grouting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110708493.4A CN113481815A (en) | 2021-06-23 | 2021-06-23 | Multiple-protection concrete composite bridge and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110708493.4A CN113481815A (en) | 2021-06-23 | 2021-06-23 | Multiple-protection concrete composite bridge and manufacturing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113481815A true CN113481815A (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110708493.4A Pending CN113481815A (en) | 2021-06-23 | 2021-06-23 | Multiple-protection concrete composite bridge and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809664A (en) * | 2022-06-13 | 2022-07-29 | 中国建筑第二工程局有限公司 | Can effectively protect building girder steel laying device of support frame upper end bolt |
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|---|---|---|---|---|
| CA2202193A1 (en) * | 1997-04-09 | 1998-10-09 | George D. Kokonis | Reusable composite bridge structure |
| WO2016135512A1 (en) * | 2015-02-27 | 2016-09-01 | The University Of Warwick | Steel-concrete composite structure |
| CN106835951A (en) * | 2017-03-28 | 2017-06-13 | 宁波金蛟龙重工钢构有限公司 | A kind of replaceable prefabricated assembled combined beam structure and manufacturing process |
| CN108643449A (en) * | 2018-04-18 | 2018-10-12 | 浙江交通职业技术学院 | A kind of detachably prefabricated assembled Steel-concrete Combined Beam Structures and manufacture craft |
| CN109555265A (en) * | 2018-12-06 | 2019-04-02 | 天津大学 | A kind of mixed combination beam of the detachable steel-using tapered cup nut bolt connection piece |
| CN109680610A (en) * | 2018-12-14 | 2019-04-26 | 浙江交通职业技术学院 | A kind of combined beam structure and manufacturing process of high strength exploitation |
| CN110593485A (en) * | 2019-09-25 | 2019-12-20 | 天津大学 | Main material damage-free detachable steel-concrete combined beam |
| CN211114418U (en) * | 2019-09-25 | 2020-07-28 | 天津大学 | Main material damage-free detachable steel-concrete combined beam |
-
2021
- 2021-06-23 CN CN202110708493.4A patent/CN113481815A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2202193A1 (en) * | 1997-04-09 | 1998-10-09 | George D. Kokonis | Reusable composite bridge structure |
| WO2016135512A1 (en) * | 2015-02-27 | 2016-09-01 | The University Of Warwick | Steel-concrete composite structure |
| CN106835951A (en) * | 2017-03-28 | 2017-06-13 | 宁波金蛟龙重工钢构有限公司 | A kind of replaceable prefabricated assembled combined beam structure and manufacturing process |
| CN108643449A (en) * | 2018-04-18 | 2018-10-12 | 浙江交通职业技术学院 | A kind of detachably prefabricated assembled Steel-concrete Combined Beam Structures and manufacture craft |
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| CN109680610A (en) * | 2018-12-14 | 2019-04-26 | 浙江交通职业技术学院 | A kind of combined beam structure and manufacturing process of high strength exploitation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809664A (en) * | 2022-06-13 | 2022-07-29 | 中国建筑第二工程局有限公司 | Can effectively protect building girder steel laying device of support frame upper end bolt |
| CN114809664B (en) * | 2022-06-13 | 2023-07-21 | 中国建筑第二工程局有限公司 | Building steel girder paving device capable of effectively protecting bolts at upper ends of support frames |
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Application publication date: 20211008 |