CN110172918A - 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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- CN110172918A CN110172918A CN201910446552.8A CN201910446552A CN110172918A CN 110172918 A CN110172918 A CN 110172918A CN 201910446552 A CN201910446552 A CN 201910446552A CN 110172918 A CN110172918 A CN 110172918A
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- China
- Prior art keywords
- embedded steel
- steel slab
- sand
- steel plate
- locating rod
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 114
- 239000010959 steel Substances 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000004576 sand Substances 0.000 claims abstract description 78
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000003466 welding Methods 0.000 claims abstract description 4
- 230000004807 localization Effects 0.000 claims description 13
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 230000033001 locomotion Effects 0.000 abstract description 4
- 238000009417 prefabrication Methods 0.000 abstract 1
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 9
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 9
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007717 exclusion Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 241000209202 Bromus secalinus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
- Bridges Or Land Bridges (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 present invention relates to prefabricated box -beam technical field more particularly to a kind of prefabricated case beam pre-embedded steel slab localization methods.
Background technique
Prefabricated case beam is widely used in bridge construction, and prefabricated case beam both ends are specifically carried to the branch of bridge column top
On seat, multiple prefabricated case beams constitute bridge main body.
As shown in fig. 6, there are two pre-embedded steel slab, pre-embedded steel slab is used for and carries bridge column for setting on the bottom surface of prefabricated case beam
The support on top contacts.Prefabricated case beam is usually not horizontally disposed it is necessary to have certain tilt angle, frequently with making pre-buried steel
Plate inclined mode is realized.The inclined angle of pre-embedded steel slab needs inclination angle when accurate be arranged to guarantee that pile equipment is in place
Degree.
There is box beam step in prefabricated box -beam step, i.e., stress is applied to it after box beam molding in advance, box beam is made to bear pressure
Stress, and then certain deformation of arching upward is generated, to cope with the load born when box beam use.When box beam tension, due to entirety by
Compressive strain, two pre-embedded steel slabs have the reduced trend of distance.
Prefabricated case beam pre-embedded steel slab gradient adjust and positioning mode in the prior art there are many.Such as Patent No.
200910186021.6 Chinese patent disclose a kind of pedestal pre-embedded steel plates of pre-stressed concrete box girder construction control device, specifically
Pre-embedded steel slab is installed in the groove of bottom die of box-beam support steel plate of same size, to limit support pre-embedded steel slab
Horizontal displacement, adjusted using the elastic angle to realize support pre-embedded steel slab of bolt, the elongation of bolt accurately controls, have
Accurately adjusting and guarantee construction quality conducive to the support pre-embedded steel slab gradient.
But which has the disadvantage in that (1) groove is identical as pre-embedded steel slab size, although being conducive to guarantee pre-embedded steel slab
Position precision, but due to pre-embedded steel slab and groove walls face contact when box girder tensioning, pre-embedded steel slab is immovable, is easy to cause tension
It is broken with steel strand wires, the problems such as extrusion fracture occurs in box beam end.(2) it is needed when pre-embedded steel slab angular adjustment repeatedly elastic
Multiple bolts, adjustment process are cumbersome.(3) part, which is adjusted, uses part, such as embedded sleeve barrel, is cast in box beam, cannot repeat to make
With causing certain waste.There is also said one or several disadvantages for the other methods of prefabricated case beam pre-embedded steel slab positioning.
Summary of the invention
The technical problem to be solved by the present invention is providing a kind of prefabricated case beam pre-embedded steel slab localization method, changing method can
Reliable location pre-embedded steel slab, but absolutely limitation pre-embedded steel slab is not mobile.
In order to solve the above problem the technical solution adopted is that: prefabricated case beam pre-embedded steel slab localization method the following steps are included:
A, prepare prefabricated box -beam pedestal and locating rod, there are two sand pits, the length and width in sand pit to compare for setting on prefabricated box -beam pedestal
The length and width of pre-embedded steel slab is big, and fine sand is filled up in sand pit；B, a pre-embedded steel slab is put into the middle part in a sand pit, is tapped
Pre-embedded steel slab makes in pre-embedded steel slab lower part embedment fine sand, and the upper surface tilt angle of pre-embedded steel slab is made to meet design requirement；
C, locating rod is inserted into fine sand and is inserted into sand pit bottom by the fine sand for pushing pre-embedded steel slab end two sides aside, and case is lower than at the top of locating rod
A locating rod is respectively arranged in girder prefabricated pedestal surface, pre-embedded steel slab end two sides, totally four locating rods；By locating rod and pre-buried steel
Plate is spot-welded together；D, smooth sand pit keeps fine sand surface concordant with prefabricated box -beam pedestal surfaces, removes the fine sand for overflowing sand pit；
E, step B, C and D step are repeated, pre-embedded steel slab, locating rod and fine sand are set in another sand pit.
Further, the length and width in sand pit is 10~16cm bigger than the length and width of pre-embedded steel slab.
Further, the depth in sand pit is 5~8cm.
Further, the shape of locating rod is L shape, locating rod includes cross bar and vertical bar, vertical bar be inserted into fine sand and with it is pre-
Burying between steel plate has distance, cross bar and pre-embedded steel slab spot welding.
Further, vertical bar end shape is taper.
The beneficial effects of the present invention are: locating rod is connect with pre-embedded steel slab in 1, pre-embedded steel slab lower part embedment fine sand.Due to
Pre-embedded steel slab apparent motion when fine sand can avoid carrying out prefabricated box -beam other processes around pre-embedded steel slab；Locating rod plays support and makees
With pre-embedded steel slab, which moves down, when avoiding carrying out prefabricated box -beam other processes leads to angle change, while fine sand also has supporting role to subtract
Small locating rod stress；Pre-embedded steel slab self weight is very big, and pre-embedded steel slab, which moves up, when avoiding carrying out prefabricated box -beam other processes leads to angle
Variation.Therefore the invention can ensure that carrying out prefabricated box -beam other processes, such as when concrete vibrating process, the positioning of pre-embedded steel slab
Precision.
Although 2, fine sand has played restriction effect to pre-embedded steel slab movement, not absolutely limitation.Tension after box beam molding
When, since drawing tension is very big, it is mobile that pre-embedded steel slab can squeeze fine sand, and fine sand passes through from pre-embedded steel slab two sides and lower section.It can
See, in box beam tension, pre-embedded steel slab adaptability is mobile, avoid occurring steel strand wires break, the safe thing such as beam-ends extrusion fracture
Therefore guarantee box beam quality.
3, when pre-embedded steel slab angular adjustment, pre-embedded steel slab corresponding position, pre-embedded steel slab angular adjustment are tapped with hammer
Operation is very convenient.
4, after box beam manufacture is completed and lifted by crane, locating rod is knocked out, locating rod is also reusable multiple.
Detailed description of the invention
Fig. 1 is prefabricated case beam pre-embedded steel slab localization method step A schematic diagram；
Fig. 2 is prefabricated case beam pre-embedded steel slab localization method step B schematic diagram；
Fig. 3 is prefabricated case beam pre-embedded steel slab localization method step C schematic diagram；
Fig. 4 is the A-A cross-sectional view of Fig. 3；
Fig. 5 is positional lever structure figure；
Fig. 6 is prefabricated case beam structure chart；
In the figure, it is marked as prefabricated box -beam pedestal 1, sand pit 2, pre-embedded steel slab 3, locating rod 4, cross bar 4-1, vertical bar 4-2.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and detailed description.
Prefabricated case beam pre-embedded steel slab localization method is the following steps are included: A, preparation prefabricated box -beam pedestal 1 and locating rod 4, case
There are two sand pits 2 for setting on girder prefabricated pedestal 1, and length and width of the length and width in sand pit 2 than pre-embedded steel slab 3 is big, husky
Fine sand is filled up in hole 2；B, a pre-embedded steel slab 3 is put into the middle part in a sand pit 2, tapping pre-embedded steel slab 3 makes under pre-embedded steel slab 3
Portion is embedded in fine sand, and the upper surface tilt angle of pre-embedded steel slab 3 is made to meet design requirement；C, 3 end of pre-embedded steel slab is pushed aside
Locating rod 4 is inserted into fine sand and is inserted into 2 bottom of sand pit by the fine sand of two sides, and 1 surface of prefabricated box -beam pedestal is lower than at the top of locating rod 4,
A locating rod 4 is respectively arranged in 3 end two sides of pre-embedded steel slab, totally four locating rods 4；Locating rod 4 is welded in one with 3 points of pre-embedded steel slab
It rises；D, smooth sand pit 2 makes fine sand surface and 1 flush of prefabricated box -beam pedestal, removes the fine sand for overflowing sand pit 2；E, it repeats to walk
Rapid B, C and D step, sets pre-embedded steel slab 3, locating rod 4 and fine sand in another sand pit 2.
Above-mentioned steps are carried out, after the completion of positioning pre-embedded steel slab 3, the subsequent handling of prefabricated box -beam is carried out according to the prior art
?.
In step A, the specific setting position in two sand pits 2 should be with the position pair of two pre-embedded steel slabs 3 on prefabricated small box girder
It answers, the middle part that pre-embedded steel slab 3 is put into sand pit 2 ensure that the position of pre-embedded steel slab 3 in this way.It, can in order to improve position precision
Measurement pre-embedded steel slab 3 at a distance from 2 edge of sand pit and adjusts 3 position of pre-embedded steel slab.The length and width in sand pit 2 is preferably than pre-
Big 10~the 16cm of length and width for burying steel plate 3 avoids sand while guaranteeing that pre-embedded steel slab 3 has reasonable positive motion space
It is excessive to cheat 2.The depth in sand pit 2 is preferably 5~8cm, guarantees to avoid sand while pre-embedded steel slab 3 has reasonable angular adjustment space
It cheats too deep.
Box beam is in use, be that the lower surface of pre-embedded steel slab 3 is contacted with the support of bridge column top.In step B, due to pre-
Burying steel plate 3 is plate, and the upper surface tilt angle of pre-embedded steel slab 3 meets design requirement, then the tilt angle of its lower surface is natural
Meet design requirement.
In step C, the insertion of locating rod 4 can squeeze fine sand, but locating rod 4 is very thin, and exclusion effect is not obvious influence
To the angle of pre-embedded steel slab 3, can ignore.But in order to further avoid influencing, it can be set as follows, the shape of locating rod 4 is L
Shape, locating rod 4 include cross bar 4-1 and vertical bar 4-2, vertical bar 4-2 insertion fine sand and have distance between pre-embedded steel slab 3, cross bar 4-1 with
3 spot welding of pre-embedded steel slab.There is a certain distance between vertical bar 4-2 in this way and pre-embedded steel slab 3, it is seen that a step avoids the exclusion of locating rod 4
Effect has an impact pre-embedded steel slab 3.It is inserted into fine sand in order to facilitate locating rod 4, vertical bar 4-2 end shape is taper.
Claims (5)
1. prefabricated case beam pre-embedded steel slab localization method, it is characterised in that: the following steps are included:
A, prepare prefabricated box -beam pedestal (1) and locating rod (4), there are two sand pit (2), sand pits for setting on prefabricated box -beam pedestal (1)
(2) length and width of the length and width than pre-embedded steel slab (3) is big, fills up fine sand in sand pit (2)；
B, a pre-embedded steel slab (3) is put into the middle part of a sand pit (2), tapping pre-embedded steel slab (3) makes pre-embedded steel slab (3) lower part
It is embedded in fine sand, and the upper surface tilt angle of pre-embedded steel slab (3) is made to meet design requirement；
C, locating rod (4) are inserted into fine sand and are inserted into sand pit (2) bottom, positioned by the fine sand for pushing pre-embedded steel slab (3) end two sides aside
It is lower than prefabricated box -beam pedestal (1) surface at the top of bar (4), a locating rod (4) is respectively arranged in pre-embedded steel slab (3) end two sides, and totally four
A locating rod (4)；Locating rod (4) and pre-embedded steel slab (3) is spot-welded together；
D, smooth sand pit (2) makes fine sand surface and prefabricated box -beam pedestal (1) flush, removes the fine sand for overflowing sand pit (2)；
E, step B, C and D step are repeated, sets pre-embedded steel slab (3), locating rod (4) and fine sand in another sand pit (2).
2. prefabricated case beam pre-embedded steel slab localization method according to claim 1, it is characterised in that: the length of sand pit (2) and
Length and width of the width than pre-embedded steel slab (3) is 10~16cm big.
3. prefabricated case beam pre-embedded steel slab localization method according to claim 2, it is characterised in that: the depth of sand pit (2) is 5
~8cm.
4. prefabricated case beam pre-embedded steel slab localization method according to claim 1, it is characterised in that: the shape of locating rod (4)
For L shape, locating rod (4) includes cross bar (4-1) and vertical bar (4-2), and vertical bar (4-2) is inserted into fine sand and has between pre-embedded steel slab (3)
Distance, cross bar (4-1) and pre-embedded steel slab (3) spot welding.
5. prefabricated case beam pre-embedded steel slab localization method according to claim 4, it is characterised in that: the end vertical bar (4-2) shape
Shape is taper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910446552.8A CN110172918B (en) | 2019-05-27 | 2019-05-27 | Method for positioning pre-buried steel plate of prefabricated box girder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910446552.8A CN110172918B (en) | 2019-05-27 | 2019-05-27 | Method for positioning pre-buried steel plate of prefabricated box girder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110172918A true CN110172918A (en) | 2019-08-27 |
| CN110172918B CN110172918B (en) | 2021-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910446552.8A Active CN110172918B (en) | 2019-05-27 | 2019-05-27 | Method for positioning pre-buried steel plate of prefabricated box girder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114227895A (en) * | 2021-12-09 | 2022-03-25 | 广西路桥工程集团有限公司 | Method for adjusting gradient of flexible sand pit during laying of embedded steel plate on flexible sand pit |
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 |
| 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 |
| 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 |
-
2019
- 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 |
| 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 |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114227895A (en) * | 2021-12-09 | 2022-03-25 | 广西路桥工程集团有限公司 | Method for adjusting gradient of flexible sand pit during laying of embedded steel plate on flexible sand pit |
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| CN110172918B (en) | 2021-04-13 |
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