CN110172918B - Method for positioning pre-buried steel plate of prefabricated box girder - Google Patents
Method for positioning pre-buried steel plate of prefabricated box girder Download PDFInfo
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- CN110172918B CN110172918B CN201910446552.8A CN201910446552A CN110172918B CN 110172918 B CN110172918 B CN 110172918B CN 201910446552 A CN201910446552 A CN 201910446552A CN 110172918 B CN110172918 B CN 110172918B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- 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
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- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a method for positioning an embedded steel plate of a prefabricated box girder, relates to the technical field of box girder prefabrication, and provides a method for positioning an embedded steel plate of a prefabricated box girder, which can reliably position the steel plate and can not absolutely limit the movement of the steel plate. The method comprises the following steps: A. preparing a box girder prefabricating pedestal and a positioning rod, wherein two sand pits are arranged on the box girder prefabricating pedestal, the length and the width of each sand pit are larger than those of the embedded steel plate, and fine sand is filled in each sand pit; B. placing an embedded steel plate in the middle of a sand pit, knocking the embedded steel plate to embed the lower part of the embedded steel plate into fine sand, and enabling the inclination angle of the upper surface of the embedded steel plate to meet the requirement; C. inserting a positioning rod into fine sand and the bottom of the sand pit, wherein the top of the positioning rod is lower than the surface of the box girder prefabricating pedestal and is in spot welding with the embedded steel plate, and two positioning rods are respectively arranged on two sides of the end part of the embedded steel plate; D. leveling the sand pit; E. and D, repeating the step B, C and the step D, and arranging the embedded steel plate, the positioning rod and the fine sand in the other sand pit.
Description
Technical Field
The invention relates to the technical field of box girder prefabrication, in particular to a method for positioning an embedded steel plate of a prefabricated box girder.
Background
The prefabricated box girder is generally applied to bridge construction, and specifically, on the support at bridge stand top was carried on prefabricated box girder both ends, a plurality of prefabricated box girders have constituted the bridge main part promptly.
As shown in fig. 6, two embedded steel plates are arranged on the bottom surface of the precast box girder, and the embedded steel plates are used for contacting with a support at the top end of the bridge-carrying upright post. The precast box girder is often not horizontally arranged, needs to have a certain inclination angle, and is often realized by adopting a mode of inclining an embedded steel plate. The angle of inclination of the pre-buried steel plate needs to be accurately set so as to ensure the inclination angle of the box girder when the box girder is installed in place.
The box girder prefabricating step comprises a box girder step, namely stress is applied to the box girder in advance after the box girder is formed, so that the box girder bears compressive stress, and further certain arch deformation is generated to correspond to load borne by the box girder when the box girder is used. When the box girder is tensioned, the distance between the two embedded steel plates tends to be reduced due to the whole compression deformation.
The precast box girder embedded steel plate gradient adjusting and positioning method has various modes in the prior art. For example, chinese patent No. 200910186021.6 discloses a construction control device for pre-buried steel plates of a prestressed concrete box girder support, specifically, the pre-buried steel plates are installed in a groove of a box girder bottom die support steel plate with the same size, so that the horizontal displacement of the pre-buried steel plates of the support is limited, the angle adjustment of the pre-buried steel plates of the support is realized by the tightness of bolts, the elongation of the bolts can be accurately controlled, and the construction control device is beneficial to the accurate adjustment of the gradient of the pre-buried steel plates of the support and ensures the construction quality.
However, this method has the following disadvantages: (1) the groove is the same with pre-buried steel sheet size, though do benefit to the position accuracy who guarantees pre-buried steel sheet, nevertheless because pre-buried steel sheet and groove wall contact during case roof beam stretch-draw, pre-buried steel sheet can not remove, leads to easily that the steel strand wires for the tension appear breaking, case beam end portion extrusion fracture scheduling problem appears. (2) When the angle of the embedded steel plate is adjusted, a plurality of bolts need to be loosened and tightened repeatedly, and the adjusting process is complex. (3) Part of adjusting parts, such as pre-embedded sleeves, are poured into the box girder, so that the box girder can not be used repeatedly, and certain waste is caused. Other methods of positioning the pre-cast steel plates of the precast box girders also have one or more of the disadvantages described above.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for positioning the pre-buried steel plate of the precast box girder is changed into a method which can reliably position the pre-buried steel plate and does not absolutely limit the movement of the pre-buried steel plate.
The technical scheme adopted for solving the problems is as follows: the method for positioning the pre-buried steel plate of the precast box girder comprises the following steps: A. preparing a box girder prefabricating pedestal and a positioning rod, wherein two sand pits are arranged on the box girder prefabricating pedestal, the length and the width of each sand pit are larger than those of the embedded steel plate, and fine sand is filled in each sand pit; B. placing an embedded steel plate in the middle of a sand pit, knocking the embedded steel plate to embed the lower part of the embedded steel plate into fine sand, and enabling the inclination angle of the upper surface of the embedded steel plate to meet the design requirement; C. poking the fine sand on two sides of the end part of the embedded steel plate, inserting positioning rods into the fine sand and the bottom of the sand pit, wherein the tops of the positioning rods are lower than the surface of the box girder prefabricating pedestal, and the two sides of the end part of the embedded steel plate are respectively provided with one positioning rod, namely four positioning rods; spot welding the positioning rod and the embedded steel plate together; D. leveling the sand pit to enable the surface of the fine sand to be flush with the surface of the box girder prefabrication pedestal, and removing the fine sand overflowing the sand pit; E. and D, repeating the step B, C and the step D, and arranging the embedded steel plate, the positioning rod and the fine sand in the other sand pit.
Further, the method comprises the following steps: the length and the width of the sand pit are 10-16 cm larger than those of the embedded steel plate.
Further, the method comprises the following steps: the depth of the sand pit is 5-8 cm.
Further, the method comprises the following steps: the shape of locating lever is L shape, and the locating lever includes horizontal pole and montant, and the montant inserts fine sand and has the distance with pre-buried steel sheet, horizontal pole and pre-buried steel sheet spot welding.
Further, the method comprises the following steps: the end of the vertical rod is conical.
The invention has the beneficial effects that: 1. the lower part of the embedded steel plate is embedded into fine sand, and the positioning rod is connected with the embedded steel plate. The fine sand surrounds the embedded steel plate, so that the embedded steel plate can be prevented from obviously moving when other box girder prefabrication procedures are carried out; the positioning rod plays a supporting role, so that the change of angles caused by the downward movement of the embedded steel plate during other box girder prefabrication procedures is avoided, and meanwhile, the fine sand also has a supporting role to reduce the stress of the positioning rod; the dead weight of the embedded steel plate is large, and the embedded steel plate is prevented from moving upwards to cause angle change when other box girder prefabrication procedures are carried out. Therefore, the invention can ensure the positioning precision of the embedded steel plate when other processes of box girder prefabrication are carried out, such as concrete vibrating process.
2. The fine sand limits the movement of the embedded steel plate, but is not absolutely limited. When the box girder is tensioned after being formed, the embedded steel plate can extrude the fine sand to move due to the large tension force, and the fine sand passes through the two sides and the lower part of the embedded steel plate. Therefore, when the box girder is tensioned, the embedded steel plate can move adaptively, safety accidents such as steel strand breakage and girder end extrusion fracture are avoided, and the quality of the box girder is guaranteed.
3. When the angle of the embedded steel plate is adjusted, the corresponding position of the embedded steel plate is knocked by a hammer, and the angle adjustment operation of the embedded steel plate is very convenient.
4. After the box girder is manufactured and lifted, the positioning rod is knocked off, and the positioning rod can be reused for many times.
Drawings
FIG. 1 is a schematic view of a positioning method for an embedded steel plate of a precast box girder, which comprises the step A;
FIG. 2 is a schematic diagram of a positioning method step B of the pre-buried steel plate of the precast box girder;
FIG. 3 is a schematic diagram of a positioning method step C of the pre-buried steel plate of the precast box girder;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a diagram of a positioning rod configuration;
FIG. 6 is a diagram of a precast box girder;
labeled as: the box girder prefabricating platform comprises a box girder prefabricating pedestal 1, a sand pit 2, an embedded steel plate 3, a positioning rod 4, a cross rod 4-1 and a vertical rod 4-2.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The method for positioning the pre-buried steel plate of the precast box girder comprises the following steps: A. preparing a box girder prefabricating pedestal 1 and a positioning rod 4, wherein two sand pits 2 are arranged on the box girder prefabricating pedestal 1, the length and the width of each sand pit 2 are larger than those of an embedded steel plate 3, and fine sand is filled in each sand pit 2; B. placing an embedded steel plate 3 in the middle of a sand pit 2, knocking the embedded steel plate 3 to embed the lower part of the embedded steel plate 3 into fine sand, and enabling the inclination angle of the upper surface of the embedded steel plate 3 to meet the design requirement; C. poking the fine sand on two sides of the end part of the embedded steel plate 3, inserting a positioning rod 4 into the fine sand and into the bottom of the sand pit 2, wherein the top of the positioning rod 4 is lower than the surface of the box girder prefabrication pedestal 1, and two positioning rods 4 are respectively arranged on two sides of the end part of the embedded steel plate 3, so that four positioning rods 4 are formed; spot welding the positioning rod 4 and the embedded steel plate 3 together; D. leveling the sand pit 2 to enable the surface of fine sand to be flush with the surface of the box girder prefabrication pedestal 1, and removing the fine sand overflowing the sand pit 2; E. and (4) repeating the step B, C and the step D, and arranging the embedded steel plate 3, the positioning rod 4 and the fine sand in the other sand pit 2.
And (4) performing the steps to complete the positioning of the embedded steel plate 3, and performing the subsequent process of box girder prefabrication according to the prior art.
In the step A, the specific setting positions of the two sand pits 2 correspond to the positions of the two embedded steel plates 3 on the prefabricated small box girder, so that the embedded steel plates 3 are placed in the middle of the sand pits 2, and the positions of the embedded steel plates 3 are guaranteed. In order to improve the position accuracy, the distance between the embedded steel plate 3 and the edge of the sand pit 2 can be measured, and the position of the embedded steel plate 3 can be adjusted. The length and the width of the sand pit 2 are preferably 10-16 cm larger than those of the embedded steel plate 3, and the sand pit 2 is prevented from being too large while the embedded steel plate 3 is ensured to have a reasonable forced movement space. The depth of the sand pit 2 is preferably 5-8 cm, and the embedded steel plate 3 is guaranteed to have a reasonable angle adjusting space while the sand pit is prevented from being too deep.
When the box girder is used, the lower surface of the embedded steel plate 3 is in contact with a support at the top end of the bridge upright post. In the step B, since the embedded steel plate 3 is a flat plate, the inclination angle of the upper surface of the embedded steel plate 3 meets the design requirement, and the inclination angle of the lower surface naturally meets the design requirement.
In the step C, the fine sand can be squeezed by inserting the positioning rod 4, but the positioning rod 4 is very thin, and the squeezing effect does not obviously influence the angle of the embedded steel plate 3 and can be ignored. However, in order to further avoid the influence, the positioning rod 4 may be L-shaped, the positioning rod 4 includes a cross rod 4-1 and a vertical rod 4-2, the vertical rod 4-2 is inserted into the fine sand and is spaced from the embedded steel plate 3, and the cross rod 4-1 is spot-welded to the embedded steel plate 3. Therefore, a certain distance is reserved between the vertical rod 4-2 and the embedded steel plate 3, and the influence of the extrusion action of the positioning rod 4 on the embedded steel plate 3 can be further avoided. In order to facilitate the insertion of the positioning rod 4 into the fine sand, the end part of the vertical rod 4-2 is conical.
Claims (5)
1. The positioning method of the pre-buried steel plate of the precast box girder is characterized by comprising the following steps: the method comprises the following steps:
A. preparing a box girder prefabricating pedestal (1) and a positioning rod (4), wherein two sand pits (2) are arranged on the box girder prefabricating pedestal (1), the length and the width of each sand pit (2) are larger than those of an embedded steel plate (3), and fine sand is filled in each sand pit (2);
B. putting an embedded steel plate (3) in the middle of a sand pit (2), knocking the embedded steel plate (3) to embed the lower part of the embedded steel plate (3) into fine sand, and enabling the inclination angle of the upper surface of the embedded steel plate (3) to meet the design requirement;
C. poking the fine sand on two sides of the end part of the embedded steel plate (3), inserting a positioning rod (4) into the fine sand and into the bottom of the sand pit (2), wherein the top of the positioning rod (4) is lower than the surface of the box girder prefabricating pedestal (1), and two positioning rods (4) are respectively arranged on two sides of the end part of the embedded steel plate (3) for four positioning rods (4); spot welding the positioning rod (4) and the embedded steel plate (3) together;
D. leveling the sand pit (2), enabling the surface of fine sand to be flush with the surface of the box girder prefabrication pedestal (1), and removing the fine sand overflowing the sand pit (2);
E. and (4) repeating the step B, C and the step D, and arranging the embedded steel plate (3), the positioning rod (4) and the fine sand in the other sand pit (2).
2. The method for positioning the pre-buried steel plates of the precast box girder according to claim 1, characterized by comprising the following steps: the length and the width of the sand pit (2) are 10-16 cm larger than those of the embedded steel plate (3).
3. The method for positioning the pre-buried steel plates of the precast box girder according to claim 2, characterized in that: the depth of the sand pit (2) is 5-8 cm.
4. The method for positioning the pre-buried steel plates of the precast box girder according to claim 1, characterized by comprising the following steps: the positioning rod (4) is L-shaped, the positioning rod (4) comprises a cross rod (4-1) and a vertical rod (4-2), the vertical rod (4-2) is inserted into fine sand and is spaced from the embedded steel plate (3), and the cross rod (4-1) and the embedded steel plate (3) are subjected to spot welding.
5. The method for positioning the pre-buried steel plates of the precast box girder as recited in claim 4, wherein the method comprises the following steps: the end part of the vertical rod (4-2) is conical.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910446552.8A CN110172918B (en) | 2019-05-27 | 2019-05-27 | Method for positioning pre-buried steel plate of prefabricated box girder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910446552.8A CN110172918B (en) | 2019-05-27 | 2019-05-27 | Method for positioning pre-buried steel plate of prefabricated box girder |
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| CN110172918A CN110172918A (en) | 2019-08-27 |
| CN110172918B true CN110172918B (en) | 2021-04-13 |
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| CN114227895B (en) * | 2021-12-09 | 2023-05-16 | 广西路桥工程集团有限公司 | Sand pit gradient adjusting method for paving embedded steel plates on flexible sand pit |
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| KR20030055213A (en) * | 2003-06-05 | 2003-07-02 | 손병욱 | Floor mat for a cowhouse |
| CN1580457A (en) * | 2004-05-20 | 2005-02-16 | 上海市第四建筑有限公司 | Precast slab bleaches water-proof treating method |
| CN204094940U (en) * | 2014-09-11 | 2015-01-14 | 葛洲坝集团第二工程有限公司 | Pre-embedded steel slab supertronic pedestal at the bottom of Precast T-Beam beam |
| CN207314150U (en) * | 2017-08-16 | 2018-05-04 | 贵州省交通规划勘察设计研究院股份有限公司 | A kind of device for being used to accurately adjust precast beam bottom pre-embedded steel slab longitudinal slope |
| CN207314149U (en) * | 2017-08-16 | 2018-05-04 | 贵州省交通规划勘察设计研究院股份有限公司 | A kind of device for being used to accurately adjust precast beam bottom pre-embedded steel slab longitudinal slope |
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- 2019-05-27 CN CN201910446552.8A patent/CN110172918B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030055213A (en) * | 2003-06-05 | 2003-07-02 | 손병욱 | Floor mat for a cowhouse |
| CN1580457A (en) * | 2004-05-20 | 2005-02-16 | 上海市第四建筑有限公司 | Precast slab bleaches water-proof treating method |
| CN204094940U (en) * | 2014-09-11 | 2015-01-14 | 葛洲坝集团第二工程有限公司 | Pre-embedded steel slab supertronic pedestal at the bottom of Precast T-Beam beam |
| CN207314150U (en) * | 2017-08-16 | 2018-05-04 | 贵州省交通规划勘察设计研究院股份有限公司 | A kind of device for being used to accurately adjust precast beam bottom pre-embedded steel slab longitudinal slope |
| CN207314149U (en) * | 2017-08-16 | 2018-05-04 | 贵州省交通规划勘察设计研究院股份有限公司 | A kind of device for being used to accurately adjust precast beam bottom pre-embedded steel slab longitudinal slope |
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