CN114434612A - Variable-parameter prefabricated T beam template system - Google Patents
Variable-parameter prefabricated T beam template system Download PDFInfo
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- CN114434612A CN114434612A CN202111654598.2A CN202111654598A CN114434612A CN 114434612 A CN114434612 A CN 114434612A CN 202111654598 A CN202111654598 A CN 202111654598A CN 114434612 A CN114434612 A CN 114434612A
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- 238000009434 installation Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 29
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- 238000009415 formwork Methods 0.000 claims description 17
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- 230000000694 effects Effects 0.000 claims description 7
- 239000011120 plywood Substances 0.000 claims description 7
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- 230000008859 change Effects 0.000 claims description 6
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- PMGQWSIVQFOFOQ-YKVZVUFRSA-N clemastine fumarate Chemical compound OC(=O)\C=C\C(O)=O.CN1CCC[C@@H]1CCO[C@@](C)(C=1C=CC(Cl)=CC=1)C1=CC=CC=C1 PMGQWSIVQFOFOQ-YKVZVUFRSA-N 0.000 description 1
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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
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/02—Moulds with adjustable parts specially for modifying at will the dimensions or form of the moulded article
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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
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
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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
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
Abstract
The invention discloses a variable parameter prefabricated T-beam template system, wherein a bottom die of a roadway plate and a back rib of a template of a web side template are disconnected, panels are continuous, and a diaphragm side template is formed at a diaphragm; a lifting adjusting screw rod is arranged at the bottom of the bottom die of the driving roadway plate; the end mould is provided with a roadway plate end mould and a web plate end mould which are independent of each other, the installation angle of the roadway plate end mould is the same as the deflection angle of the designed beam end, and the web plate end moulds are provided with a plurality of types and are respectively matched with the deflection angle range of the designed beam end; the web side die located in the middle cross section of the T-shaped beam span is provided with a template adjusting block, counter-pulling screw rods are arranged between the four corners of the web end die and the end part of the web side die, the prefabricated pedestal is a concrete pedestal and is divided into two parts, one part is a basic pedestal, the other part is a lengthened pedestal, and a field adjusting section is arranged between the beam boot bottom die and a movable table top or a fixed table top. The invention can be used for producing various precast beams, can effectively improve the utilization rate of the template and the pedestal, improves the construction efficiency and reduces the resource investment.
Description
Technical Field
The invention relates to a prefabricated T-beam template system, in particular to a variable-parameter prefabricated T-beam template system.
Background
Roads in mountainous areas are limited by terrain, longitudinal slopes and linear curvatures of bridges are large, and more simply-supported bridge bridges are prefabricated due to the consideration of earthquake resistance and uneven deformation resistance; especially, on the interchange overpass, the irregular precast beams with large deflection angle, large longitudinal slope and variable beam length are used in large quantity. The irregularity of the precast beam causes the precast beam to have complex precast process, the utilization rate of the conventional matched template and pedestal is low, the construction period and the cost investment are increased, and the original conventional precast beam template and pedestal can not be well adapted to the production of a large number of precast beams with complex and variable parameters.
Disclosure of Invention
The invention provides a variable-parameter prefabricated T-beam template system for solving the technical problems in the prior art, and the same template and pedestal can be used for producing prefabricated beams with various cross slopes, various lengths, various end deflection angles and various beam shoe longitudinal slopes, so that the utilization rate of the template and the pedestal can be effectively improved, the construction efficiency is improved, and the resource investment is reduced.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a variable parameter prefabricated T beam template system comprises a pedestal and a T beam template, wherein the T beam template comprises a roadway board bottom die, a web side die, a diaphragm plate side die and an end die, the roadway board bottom die is disconnected with a web side die template back rib, and the panels are continuous; the bottom of the bottom die of the roadway plate is provided with a lifting adjusting screw rod with adjustable height, and the lifting adjusting screw rod is vertically arranged on a cross beam of the web side die back rib support frame; the end die is provided with a roadway plate end die and a web plate end die which are independent of each other, the installation angle of the roadway plate end die is the same as the deflection angle of the designed beam end, the web plate end die is provided with a plurality of types, the deflection angle ranges of the beam end are designed corresponding to the web plate end die in a fitting mode, tensioning grooves are fixedly connected to the inner end faces of the various web plate end dies, and the bottom faces of the tensioning grooves are perpendicular to the axis of the precast beam; the maximum height of the various web plate end mould panels protruding out of the corresponding end mould panels of the roadway plate is not more than the maximum deviation value of the beam end allowed by design; the template adjusting blocks are arranged on web side dies positioned on middle cross section sections of the T-shaped beam, one of the template adjusting blocks is a fixed length adjusting block, the other one of the template adjusting blocks is a modulus adjusting block, the length of the fixed length adjusting block is not less than 1000mm, the length of the modulus adjusting block takes 1/2 of the steel bar interval of a roadway plate of the T-shaped beam as the modulus, the maximum length of the modulus adjusting block is not more than 500mm, counter-pulling screw rods are arranged between the four corners of the web end die and the end parts of the web side dies, the counter-pulling screw rods are connected with the web end dies through nuts II, the nuts II are welded on the inner sides of the web end dies, the counter-pulling screw rods are connected with the end parts of the web side dies through lug plates, the lug plates are welded on the end parts of the web side dies, and the counter-pulling screw rods are fixedly connected to the lug plates in a position-adjustable manner; the pedestal is a concrete pedestal and is divided into two parts, one part is a foundation pedestal and is provided with a fixed table top, channel steel I is arranged on two sides below the fixed table top, a grout stopping strip I is arranged in the channel steel I, the channel steel I and the fixed table top are both fixed on the top of the foundation pedestal, and the length of the foundation pedestal is equal to the length of a minimum designed beam length minus beam shoes at two ends of the beam; the other part is a lengthened pedestal which is lower than the basic pedestal, a movable table top is arranged above the lengthened pedestal and is arranged at two ends of the basic pedestal, the movable table top is flush with the fixed table top, two sides below the movable table top are provided with channel steel II, a grout stopping bar II is arranged in the channel steel II, and the channel steel II is arranged on the top surface of the lengthened pedestal; the widths of the fixed table top and the movable table top are equal to the width of the bottom surface of the middle cross section of the T-shaped beam; the bottom of a web plate side die of a bottom surface widening section and a bottom surface width gradual change section at two ends of the T beam is provided with a bag bottom, the bag bottom is made of section steel or a thick steel plate, one side of the bag bottom is welded and fixed with the web plate side die, the other side of the bag bottom is aligned with the fixed table top or the movable table top, the top surface of the bag bottom is a plane and is aligned with the fixed table top or the movable table top, the width of the bag bottom changes along with the change of the width of the bottom surface at different positions of the T beam and is equal to half of the difference value of the width of the bottom surface of the T beam between the corresponding positions of the T beam and the middle bottom surface; arranging a beam shoe bottom die at the position of a beam shoe, wherein the beam shoe bottom die adopts a wood wedge support pad to form a slope; the beam boot die block with the activity mesa or be equipped with the on-the-spot regulation section between the fixed mesa, the on-the-spot regulation section is equipped with the square frame of being enclosed by only thick liquid strip the square frame intussuseption is filled with the coarse sand body the square frame top covers there is the plywood, the plywood top covers there is the plastic sheeting, the plastic sheeting with the activity mesa or the fixed mesa parallel and level.
The web end die is provided with a right offset web end die, a vertical web end die and a left offset web end die.
The types and the number of the right-side deflection type web plate end dies are as follows: n isy＝[(|cotαmax×B/2|-|Δx|max)/(2×|Δx|max)]Rounding upwards;
the deflection angle theta corresponding to each web plate end die takes the following values:
θ＝90°+arctan(2k×|Δx|max/(B/2))，k＝1、2......ny；
the design beam end deflection angle range of the web plate end mode fitting with the deflection angle theta is as follows:
90°+arctan[(2k-1)×|Δx|max/(B/2)]to 90 ° + arctan [ (2k +1) × | Δ χ |, + Ymax/(B/2)]，k＝1、2......ny，
Wherein alpha ismaxDesigning the maximum deflection angle alpha of the right deflection beam endmaxMore than 90 degrees, B is the width of the web end head, | DeltaxmaxIs the maximum deviation value of the beam end allowed by the design.
The type and quantity of the left offset web plate end die are as follows: n isz＝[(|cotαmin×B/2|-|Δx|max)/(2×|Δx|max)]Rounding upwards;
the deflection angle theta corresponding to each web plate end die takes the following values:
θ＝90°-arctan(2k×|Δx|max/(B/2))，k＝1、2......nz；
the designed beam end deflection angle range of the web end mode fitting with the deflection angle theta is as follows:
90°-arctan[(2k+1)×|Δx|max/(B/2)]to 90 ° -arctan [ (2k-1) × | Δ χmax/(B/2)]，k＝1、2......nz，
Wherein alpha isminIs to design the minimum value of the beam end deflection angle, alphaminLess than 90 degrees, B is the width of the web end, | DeltaxmaxIs the maximum deviation value of the beam end allowed by the design.
The deflection angle of the vertical web plate end mold is 90.0 degrees, and the deflection angle range of the fitted designed beam end is as follows: 90-arctan [ | Deltaxmax/(B/2)]To 90 ° + arctan [ |. DELTA.xmax/(B/2)]Wherein B is the width of the web end, | Δ xmaxIs the maximum deviation value of the beam end allowed by the design.
And the lifting adjusting screw rod is locked on the web side die back rib support frame cross beam by an upper nut and a lower nut I.
The split screw is fixedly locked on the ear plate by adopting a front nut and a rear nut.
The invention has the advantages and positive effects that: the free adjustment of the cross slope is realized through a lifting adjusting screw rod and a lapped diaphragm side mold structure, the adjustment of the beam end deflection angle is realized through a T beam end mold structure with a running track plate separated from a web plate and a mode of setting different deflection angle types of web plate end molds to design the beam end deflection angle in a fitting mode, the free adjustment of the length of a template is realized through a side mold adjusting block and an end mold split screw rod structure, the free adjustment of the length of a prefabricated pedestal platform surface is realized through a combined structure of a fixed platform surface, a movable platform surface, an on-site adjusting section, a beam shoe bottom mold and a side mold bottom wrapping, the purpose of producing prefabricated beams with different cross slopes, beam end deflection angles and beam lengths by using the same set of pedestal and template is achieved, the produced prefabricated beams are accurate in size and simple and convenient to construct, and the investment of the template is saved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a template panel structure according to the present invention;
FIG. 3 is a schematic cross-sectional view of a template of the present invention;
FIG. 4 is a schematic view of the structure of the end mold of the roadway plate and the end mold of the web plate of the present invention;
FIG. 5 is a schematic view of the installation of the end forms of the roadway panels and the end forms of the web of the present invention;
FIG. 6 is a schematic view of a right-handed offset web end die of the present invention;
FIG. 7 is a schematic view of a vertical web end mold configuration of the present invention;
FIG. 8 is a schematic view of a left offset web end mold of the present invention;
FIG. 9 is a schematic diagram of end-to-end skew angle deviation of a right-handed spar of the right-handed web end-mode fit of the present invention;
FIG. 10 is a schematic diagram of left offset web end mode fitting left offset spar end offset angle deviation of the present invention;
FIG. 11 is a schematic view of a side form of a T-beam web of the present invention;
FIG. 12 is a cross-sectional view of a foundation bed of the present invention;
FIG. 13 is a cross-sectional view of the elongated pedestal and movable table of the present invention;
FIG. 14 is a cross-sectional configuration of the movable table of the present invention;
fig. 15 is a cross-sectional configuration view of the field adjustment segment of the present invention.
In the figure: 1. a bottom die of the roadway plate; 2. a web side mold; 3. a movable panel is arranged on the upper part of the diaphragm plate side mold; 4. fixing a panel by using the diaphragm plate side mold; 5. a back rib of a bottom die of the roadway plate; 6. a web-side mold back rib; 7. a web side die back rib support frame cross beam; 8. a lifting adjusting screw rod; 9. a nut I; 10. a roadway plate end form; 11. a web end die; 12. a prestress tensioning groove; 13. prefabricating the beam axis; 14. a roadway plate end form panel; 15. a web end form panel; 16.1, a fixed length adjusting block; 16.2 modulus adjusting block; 17. oppositely pulling the screw rod; 18. a nut II; 19. an ear plate; 20. a nut III; 21. a base pedestal; 22. fixing the table top; 23. channel steel I; 24. a grout stopping strip I; 25. lengthening the pedestal; 26. a movable table top; 27. channel steel II; 28. a grout stopping strip II; 29. wrapping the bottom; 30. a beam shoe bottom die; 31. wood wedge; 32. a field conditioning section; 33. a square frame surrounded by the grout stopping strips; 34. coarse sand bodies; 35. plywood; 36. and (3) plastic cloth.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
referring to fig. 1 to 15, a variable parameter prefabricated T-beam formwork system includes a pedestal and a T-beam formwork, where the T-beam formwork includes a roadway slab bottom formwork, a web side formwork, a diaphragm side formwork and an end formwork.
The system is characterized in that:
first) the cross slope angle is adjustable, the detailed description is as follows:
the template back ribs 5 and 6 of the roadway board bottom die 1 and the web side die 2 are disconnected, the panels are continuous, the continuous panel is provided with a diaphragm side die upper movable panel 3 continuous with the panel of the roadway board bottom die 1 and a diaphragm side die fixed panel 4 continuous with the panel of the web side die 2 at the diaphragm, the diaphragm side die upper movable panel 3 and the diaphragm side die fixed panel 4 are in lap joint at the junction and can move relatively, and the diaphragm side die is formed; the bottom of the bottom die 1 of the roadway plate is provided with a lifting adjusting screw rod 8 with adjustable height, and the lifting adjusting screw rod 8 is vertically installed on a web side die back rib support frame cross beam 7.
In this embodiment, the lifting adjusting screw 8 is locked on the beam 7 of the web side form back rib support frame by an upper nut and a lower nut I9, so that the length of the adjusting screw can be conveniently adjusted and fixed.
By adopting the disconnection of the back rib of the bottom die of the running board and the back rib of the template of the web side template, the panel is continuous and extends to the transverse partition plate to form the transverse partition plate side template which can move relatively and keep lap joint, the movable panel on the bottom die of the running board and the upper part of the transverse partition plate side template can be turned over, and the transverse slope of the running board can be adjusted and fixed by adopting the lifting adjusting screw rod. The structure that the movable panel on the upper part of the lateral mould of the diaphragm plate and the fixed panel of the lateral mould of the diaphragm plate can move relatively and are lapped all the time can ensure the continuity of the lateral mould panels of the diaphragm plate when the cross slope of the running track plate is adjusted, thereby achieving the purpose of freely adjusting the cross slope of the prefabricated T beam, the prefabricated T beam produced has accurate cross slope, the surface of the diaphragm plate is smooth and continuous, and the production quality of the T beam is good.
Second) the beam end deflection angle is adjustable, as detailed below:
the end mould is provided with a roadway plate end mould 10 and a web plate end mould 11 which are independent of each other, the installation angle of the roadway plate end mould 10 is the same as the deflection angle of the designed beam end, the web plate end mould 11 is provided with a plurality of types, the deflection angle ranges of the beam end are designed corresponding to the web plate end moulds in a fitting mode respectively, tensioning grooves 12 are fixedly connected to the inner end surfaces of the various web plate end moulds, and the bottom surfaces of the tensioning grooves 12 are perpendicular to the axis 13 of the precast beam; the maximum height of the various web end model panels 15 protruding out of the corresponding roadway plate end model panels 14 is not more than the maximum deviation value | Deltax! of the beam ends allowed by designmax。
In this embodiment, the width of the designed expansion joint is 80mm, and the maximum deviation | Δ x! allowable in design of beam end is ventilatedmaxIs 25 mm. The web end die 11 is equipped with a right offset web end die, a vertical web end die and a left offset web end die. And the deflection angle of the right deflection type web plate end die is 80.54 degrees, and the deflection angle range of the fitted designed beam end is 75.96-85.24 degrees; the deflection angle of the left deflection type web plate end die is 99.46 degrees, and the deflection angle range of the fitted designed beam end is 94.76 degrees-104.04 degrees. The deflection angle of the end mould of the vertical web plate is 90.0 degrees, and the deflection angle range of the fitted designed beam end is 85.24-94.76 degrees.
The design principle of the end die is as follows:
dividing the end template into 1 web end mold 11 and 1 carriageway plate end mold 10; because the web end die 11 comprises the prestress tension groove 12, the tension groove 12 is required to be vertical to the beam axis 13 and fixed with the web end die 11; adjusting the end deflection angle of the running board by adjusting the installation angle of the end mold 10 of the running board(ii) a When the deflection angle of the beam end is too large, the deflection of the two sides of the web end and the design position is controlled to be the maximum deviation value | Deltax! allowed by the design by calculating the web end die 11 with different deflection anglesmaxWithin 25mm to avoid the excessive invasion of design expansion joint, adjacent beam-ends of beam-ends web edge to take place the extrusion conflict.
In order to solve the problems, the embodiment calculates and sets three web end molds with deflection angles of 80.54 degrees, 90 degrees and 99.46 degrees for constructing the precast beam with larger deflection angle. The three end formworks are respectively used for constructing precast beams within the following deflection angle ranges:
end template deflection angle application range
| Web end die deflection angle | Suitable for the end deflection angle range of the precast beam | Maximum design allowed beam-end deviation value |
| 80.54° | 75.96°～85.24° | 25mm |
| 90.0° | 85.24°～94.76° | 25mm |
| 99.46° | 94.76°～104.04° | 25mm |
The calculation process is as follows:
referring to fig. 9 to 10, the width B of the web end is 600mm, the beam end design deflection angle α varies between 78.76 to 104 °, and the web end mode deflection angle θ; the position of the end mould panel 14 of the roadway plate is consistent with the deflection angle of the designed beam end, and the deflection angle of the end mould panel 15 of the web plate is consistent with the deflection angle of the end mould of the web plate; the longitudinal distance between the designed positions on two sides (the transverse distance B/2 from the beam axis) of the web end and the beam axis of the beam end is H, the longitudinal distance between the actual position and the beam axis of the beam end is H, and the deviation between the actual position and the designed position is delta x; according to the geometrical relationship:
H＝cotα×B/2
h＝cotθ×B/2
Δx＝H-h＝(cotα-cotθ)×B/2
h, h in the above equation is a positive number indicating that the web tip is right-hand forward and left-hand backward compared to the longitudinal position at the beam-end beam axis, and a negative number indicating that the web tip is right-hand backward and left-hand forward compared to the longitudinal position at the beam-end beam axis; Δ x is a positive number indicating that the actual position of the web tip is right behind and left ahead compared with the design position, and a negative number indicating that the actual position of the web tip is right ahead and left behind compared with the design position.
When the maximum design deflection angle alpha of the beam end is 104 degrees, H is-74.8 mm, if the web plate end formwork panel is still perpendicular to the beam axis, namely theta is 0 degree, H is 0mm, and deltax is H-H is-74.8 mm, namely the actual position of the right side of the web plate end is protruded by 74.8mm compared with the design position and is invaded into the design expansion joint; the expansion joint width designed in this embodiment is 80mm, and the maximum deviation | Δ x! allowed by design of beam-endsmaxIs 25 mm. In order to avoid excessive invasion of the edge of the web plate at the beam end into the designed expansion joint and extrusion conflict between the adjacent beam ends, the absolute value | Δ x | ≦ Δ x |, between the actual positions at the two sides of the web end and the deviation Δ x of the designed position, needs to be set by setting the offset angle θ of the web end moldmax＝25mm。
1) The end die deflection angle theta of the vertical web plate is equal to 90 degrees, and the method is suitable for designing the longitudinal distance H between the design positions of two sides of the end head of the web plate (the transverse distance B/2 from the beam axis) and the beam axis of the beam end in- | delta x |max～+|Δx|maxThe precast beam in the range is obtained according to the geometrical relationship, and the suitable beam end deflection angle range of the vertical web plate end die is as follows: 90-arctan [. airΔx|max/(B/2)]To 90 ° + arctan [ |. DELTA.xmax/(B/2)]；
Arranging B600 mm, | Deltax |maxSubstituting 25mm into the above formula to obtain:
the deflection angle range of the beam end suitable for the vertical web plate end mould is 90-arctan [ | Deltax [ & lt & gt & lt & gtmax/(B/2)]85.24 to 90 ° + arctan [ | Δ χ |)max/(B/2)]＝94.76°。
2) The type and value of an end mode deflection angle theta of a right deflection type web plate end die are determined according to the maximum value alpha of a designed beam end deflection anglemaxThe width B of the web end and the maximum allowable deviation | DeltaxmaxThe method comprises the following steps:
the maximum value of the longitudinal distance between the design positions of two sides (the transverse distance B/2 from the beam axis) of the web end and the beam axis of the beam end is Hmax＝cotαmax×B/2；
Each right-offset web plate end die can be suitable for the deviation of the design positions of two sides (the transverse distance B/2 from the beam axis) of the web plate end and the actual position of the web plate end die into | Deltaxmax～+|Δx|maxThe application interval of the precast beam within the range, namely each right-offset web plate end die, is 2 x |. DELTA.xYmax(ii) a The vertical web plate end die is suitable for designing the longitudinal distance H between the design positions of two sides of the web plate end (the transverse distance B/2 from the beam axis) and the longitudinal distance H of the beam end beam axismax～+|Δx|maxPrecast beam in range of | H->|Δx|maxSetting a web plate end die with a deflection angle, wherein the application range of the web plate end die with the deflection angle needs to completely cover | delta xmax～|HmaxRange of not less than | Δ xmax～|Hmax(ii) 2X | Δ x | (Δ x |) per interval in | rangemaxConfiguring a web plate end mold, and finally remaining the dimension less than 2 x | delta x ¬ ventilatedmaxThe interval of the two end plates still needs to be provided with a web plate end die, so that the type number n of the right-handed offset web plate end die needs to be providedy＝[(Hmax|-|Δx|max)/(2×|Δx|max)]And rounding up.
The longitudinal distance between the positions of two sides (the transverse distance B/2 from the beam axis) of the web end corresponding to each right-offset web end die and the beam axis of the beam end is 2 kxDeltaxYmax，k＝1、2……nyThe speciesThe longitudinal distances between the positions on two sides (the transverse distance B/2 from the beam axis) of the web end corresponding to the upper limit position and the lower limit position of the application range of the right-deviation web end die and the beam axis of the beam end are respectively (2k +1) × | delta x |maxAnd (2k-1) × | Δ χ shadingmax，k＝1、2……nyAccording to the geometrical relationship, the following can be known:
the deflection angle theta corresponding to each web plate end mould is equal to 90 degrees + arctan (2k x delta x non woven cells)max/(B/2))，k＝1、2……ny；
The suitable beam end deflection angle range of the web plate end mold with the deflection angle theta is 90 degrees plus arctan [ (2k-1) × | delta x | non-conducting lightmax/(B/2)]To 90 ° + arctan [ (2k +1) × | Δ χ |, (ii) no magnetismmax/(B/2)]，k＝1、2……ny；
In the above formula, | H |, | HmaxThe expression of | and | Δ x | is H, HmaxΔ x.
Will be alphamax＝104°、B＝600mm、|Δx|maxSubstituting 25mm into the above formula to obtain:
Hmax＝cotαmax×B/2＝-74.8mm；
type number n of right-handed web end molds to be equippedy＝[(|Hmax|-|Δx|max)/(2×|Δx|max)]Getting the whole upward to be 1;
the deflection angle theta corresponding to the web end mold is 90 degrees + arctan (2 × 1 × | Δ x |)max/(B/2))＝99.46°；
The suitable beam end deflection angle range of the web plate end die with the deflection angle theta of 99.46 degrees is as follows:
90°+arctan[(2×1-1)×|Δx|max/(B/2)]94.76 DEG to 90 DEG + arctan [ (2 × 1+1) × | Δ χmax/(B/2)]＝104.04°。
3) The type and value of the end die deflection angle theta of the left deflection type web plate end die are determined according to the minimum value alpha of the designed beam end deflection angleminThe width B of the web end and the maximum allowable deviation | DeltaxmaxThe determination is calculated as follows:
the maximum value of the longitudinal distance between the design positions of two sides (the transverse distance B/2 from the beam axis) of the web end and the beam axis of the beam end is Hmax＝cotαmin×B/2；
Each kind ofThe left offset type web plate end die can be suitable for the deviation of the design positions of two sides (the transverse distance B/2 from the beam axis) of the web plate end head and the actual position of the web plate end die into | delta x! air distributionmax～+|Δx|maxThe application interval of the precast beam in the range, namely each left offset web plate end mould is 2 x |. DELTA.xYmax(ii) a The vertical web plate end die is suitable for designing the longitudinal distance H between the design positions of two sides of the web plate end (the transverse distance B/2 from the beam axis) and the longitudinal distance H of the beam end beam axismax～+|Δx|maxPrecast beam in range of | H->|Δx|maxSetting a web plate end die with a deflection angle, wherein the application range of the web plate end die with the deflection angle needs to completely cover | delta xmax～|HmaxRange of not less than | Δ xmax～|Hmax(ii) 2X | Δ x | (Δ x |) per interval in | rangemaxConfiguring a web plate end mold, and finally remaining the dimension less than 2 x | delta x ¬ ventilatedmaxThe interval of the two end plates still needs to be provided with a web plate end die, so that the type number n of the left offset web plate end die needs to be providedz＝[(|Hmax|-|Δx|max)/(2×|Δx|max)]Rounding upwards;
the longitudinal distance between the positions of two sides (the transverse distance B/2 from the beam axis) of the web end corresponding to each left offset type web end die and the beam axis of the beam end is 2 kxDeltaxYmax，k＝1、2……nzThe longitudinal distances between the positions of two sides (the transverse distance B/2 from the beam axis) of the web end corresponding to the upper limit position and the lower limit position of the application range of the left offset type web plate end die and the beam axis of the beam end are respectively (2k +1) × | delta x |maxAnd (2k-1) × | Δ χ shadingmax，k＝1、2……nzAccording to the geometric relationship, the deflection angle theta corresponding to each web plate end mold is equal to 90 degrees-arctan (2 kxDeltax does not cross air holes)max/(B/2))，k＝1、2……nz；
The suitable beam end deflection angle range of the web plate end mold with the deflection angle theta is 90 degrees to arctan [ (2k +1) × | delta x | (a) & gtmax/(B/2)]To 90 ° -arctan [ (2k-1) × | Δ χmax/(B/2)]，k＝1、2……nz；
In the above formula, | H |, | HmaxThe expression of | and | Δ x | is H, HmaxΔ x.
Will be alphamin＝78.76°、B＝600mm、|Δx|maxSubstituting 25mm into the above formula to obtain:
Hmax＝cotαmin×B/2＝59.6mm；
type number n of left offset web end molds to be equippedz＝[(|Hmax|-|Δx|max)/(2×|Δx|max)]Getting the whole upward to be 1;
the deflection angle theta corresponding to the web plate end mold is equal to 90-arctan (2 x 1 x delta x) non-ventilatedmax/(B/2))＝80.54°；
The suitable beam end deflection angle range of the web plate end die with the deflection angle theta of 80.54 degrees is as follows:
90°-arctan[(2×1+1)×|Δx|max/(B/2)]75.96 DEG to 90 DEG ARCTAN [ (2X 1-1) × | DeltaXmax/(B/2)]＝85.24°。
Through the T beam-ends mould structure that adopts lane board end mould and web end mould separation, set up the stretch-draw groove on the web end mould to web end mould fitting design roof beam-ends declination of setting up different declination types has realized guaranteeing under the prerequisite of stretch-draw tank bottom and precast beam axis vertically, the purpose of producing the prefabricated T roof beam of different roof beam-ends declination, need not the secondary and pour roof beam-ends declination part, the precast beam-ends declination of producing is accurate, the linear smooth-going of roof beam-ends, the roof beam-ends wholeness is good, the construction is simple and convenient, construction cycle is short, moreover, the steam generator is simple in structure, can make full use of original precast beam side mould and pedestal, the template input is little.
Third) adjustable length, the detailed description is as follows:
the web side die 2 positioned at the middle cross section of the T-beam span is provided with two types of template adjusting blocks, wherein one type of the template adjusting blocks is a fixed length adjusting block 16.1, the other type of the template adjusting block is a modulus adjusting block 16.2, the length of the fixed length adjusting block 16.1 is not less than 1000mm, the length of the modulus adjusting block 16.2 takes 1/2 of the steel bar interval of a T-beam roadway plate as a modulus l, the maximum length of the modulus adjusting block is not more than 500mm, counter-pulling screw rods 17 are arranged between the four corners of the web end die 11 and the end part of the web side die 2, the counter-pulling screw rods 17 are connected with the web end die through nuts II 18, the nuts II 18 are welded on the inner side of the web end die 11, the counter-pulling screw rods 17 are connected with the end part of the web side die 2 through lugs 19, the lugs 19 are welded on the end part of the web side die 2, and the counter-pulling screw rods 17 are fixedly connected on the lugs 19 in an adjustable position;
the precast pedestal is a concrete pedestal and is divided into two parts, one part is a foundation pedestal 21 and is provided with a fixed table top 22, two sides below the fixed table top are provided with channel steel I23, a grout stopping strip I24 is arranged in the channel steel I23, the channel steel I23 and the fixed table top 22 are both fixed at the top of the foundation pedestal 21, and the length of the foundation pedestal 21 is equal to the length of a minimum designed beam length minus beam shoes at two ends of the beam; the other part is a lengthened pedestal 25 which is lower than the base pedestal 21, a movable table top 26 is arranged above the lengthened pedestal 21 and is arranged at two ends of the base pedestal 21, the movable table top 26 is flush with the fixed table top 22, two sides below the movable table top 26 are provided with channel steel II 27, a grout stopping bar II 28 is arranged in the channel steel II 27, and the channel steel II 27 is arranged on the top surface of the lengthened pedestal 25; the widths of the fixed table top 22 and the movable table top 26 are equal to the width of the bottom surface of the middle cross section of the T-shaped beam;
set up package end 29 in web side form 2 bottom of T roof beam both ends bottom surface widening section and bottom surface width transition, package end 29 adopts shaped steel or steel plate to make, one side with 2 welded fastening of web side form, the opposite side with fixed mesa 22 or activity mesa 26 are leaned on, package end 29 top surface is the plane, with fixed mesa 22 or activity mesa 26 parallel and level, package end 29 width changes along with the change of T roof beam different positions bottom surface width, equals that T roof beam corresponding position bottom surface width subtracts half of the difference of T roof beam midspan bottom surface width.
Arranging a beam shoe bottom die 30 at the position of a beam shoe, wherein the beam shoe bottom die 30 is supported by a wood wedge 31 to form a slope; a field adjusting section 32 is arranged between the beam and boot bottom mold 30 and the movable table top 26 or the fixed table top 22, the field adjusting section 32 is provided with a square frame 33 enclosed by a grout stopping strip, the square frame 33 is filled with coarse sand 34, the top of the square frame 33 is covered with a plywood 35, the top of the plywood 35 is covered with plastic cloth 36, and the plastic cloth 36 is flush with the movable table top 26 or the fixed table top 22.
In this embodiment, the tension screw 17 is locked on the ear plate 19 by using two front and rear nuts iii 20.
The length of the web side die is greatly adjusted by adopting the fixed length adjusting block and the modulus adjusting block, the length of the beam is finely adjusted by adopting the end die with the counter-pulling screw rod, the length of the panel of the prefabricated pedestal is greatly adjusted by adopting the movable panel of the prefabricated pedestal, the length of the panel of the prefabricated pedestal is finely adjusted by adopting the field adjusting section made of the grout stop strip and coarse sand, the beam shoe can be arranged at any position on the prefabricated pedestal according to the length of the designed T beam by adjusting the length of the panel of the prefabricated pedestal, the bottom widening section of the T beam can be changed along with the change of the position of the template by arranging the bottom covers at the bottom of the web side dies at two ends of the T beam, the prefabricated T beam with any length can be produced by matching the side die with the prefabricated pedestal, and the prefabricated T beam has the advantages of simple structure, convenience in operation and large-range turnover utilization benefit, and the investment of the template and the pedestal can be saved.
Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the invention as claimed.
Claims (7)
1. A variable parameter prefabricated T beam template system comprises a pedestal and a T beam template, wherein the T beam template comprises a roadway plate bottom die, a web plate side die, a diaphragm plate side die and an end die,
the transverse partition plate side die upper movable panel and the transverse partition plate side die fixed panel are in lap joint at the junction and can move relatively to form the transverse partition plate side die; the bottom of the bottom die of the roadway plate is provided with a lifting adjusting screw rod with adjustable height, and the lifting adjusting screw rod is vertically arranged on a cross beam of the web side die back rib support frame;
the end die is provided with a roadway plate end die and a web plate end die which are independent of each other, the installation angle of the roadway plate end die is the same as the deflection angle of the designed beam end, the web plate end die is provided with a plurality of types, the deflection angle ranges of the beam end are designed corresponding to the web plate end die in a fitting mode, tensioning grooves are fixedly connected to the inner end faces of the various web plate end dies, and the bottom faces of the tensioning grooves are perpendicular to the axis of the precast beam; the maximum height of the various web plate end mould panels protruding out of the corresponding end mould panels of the roadway plate is not more than the maximum deviation value of the beam end allowed by design;
the template adjusting blocks are arranged on web side dies positioned on a middle cross section of a T-beam span, one of the template adjusting blocks is a fixed length adjusting block, the other template adjusting block is a modulus adjusting block, the length of the fixed length adjusting block is not less than 1000mm, the length of the modulus adjusting block takes 1/2 of the steel bar interval of a T-beam roadway slab as the modulus, the maximum length of the modulus adjusting block is not more than 500mm, counter-pulling screw rods are arranged between four corners of the web end die and the end part of the web side die and are connected with the web end die through nuts II, the nuts II are welded on the inner side of the web end die, the counter-pulling screw rods are connected with the end part of the web side die through lug plates, the lug plates are welded on the end part of the web side die, and the counter-pulling screw rods are fixedly connected to the lug plates in an adjustable manner;
the pedestal is a concrete pedestal and is divided into two parts, one part is a foundation pedestal and is provided with a fixed table top, channel steel I is arranged on two sides below the fixed table top, a grout stopping strip I is arranged in the channel steel I, the channel steel I and the fixed table top are both fixed on the top of the foundation pedestal, and the length of the foundation pedestal is equal to the length of a minimum designed beam length minus beam shoes at two ends of the beam; the other part is a lengthened pedestal which is lower than the basic pedestal, a movable table top is arranged above the lengthened pedestal and is arranged at two ends of the basic pedestal, the movable table top is flush with the fixed table top, two sides below the movable table top are provided with channel steel II, a grout stopping bar II is arranged in the channel steel II, and the channel steel II is arranged on the top surface of the lengthened pedestal; the widths of the fixed table top and the movable table top are equal to the width of the bottom surface of the middle cross section of the T-shaped beam;
the bottom of a web plate side die of a bottom surface widening section and a bottom surface width gradual change section at two ends of the T beam is provided with a bag bottom, the bag bottom is made of section steel or a thick steel plate, one side of the bag bottom is welded and fixed with the web plate side die, the other side of the bag bottom is aligned with the fixed table top or the movable table top, the top surface of the bag bottom is a plane and is aligned with the fixed table top or the movable table top, the width of the bag bottom changes along with the change of the width of the bottom surface at different positions of the T beam and is equal to half of the difference value of the width of the bottom surface of the T beam between the corresponding positions of the T beam and the middle bottom surface;
arranging a beam shoe bottom die at the position of a beam shoe, wherein the beam shoe bottom die adopts a wood wedge support pad to form a slope; the beam boot die block with the activity mesa or be equipped with the on-the-spot regulation section between the fixed mesa, the on-the-spot regulation section is equipped with the square frame of being enclosed by only thick liquid strip the square frame intussuseption is filled with the coarse sand body the square frame top covers there is the plywood, the plywood top covers there is the plastic sheeting, the plastic sheeting with the activity mesa or the fixed mesa parallel and level.
2. The variable parameter precast T beam formwork system of claim 1, wherein the web end formwork is equipped with a right-hand profiled web end formwork, a vertical profiled web end formwork and a left-hand profiled web end formwork.
3. The variable-parameter prefabricated T-beam template system according to claim 2,
the types and the number of the right-side deflection type web plate end dies are as follows:
ny＝[(|cotαmax×B/2|-|Δx|max)/(2×|Δx|max)]rounding upwards;
the deflection angle theta corresponding to each web plate end die takes the following values:
θ＝90°+arctan(2k×|Δx|max/(B/2))，k＝1、2......ny；
the design beam end deflection angle range of the web plate end mode fitting with the deflection angle theta is as follows:
90°+arctan[(2k-1)×|Δx|max/(B/2)]to 90 ° + arctan [ (2k +1) × | Δ χ |, + Ymax/(B/2)]，k＝1、2......ny，
Wherein alpha ismaxIs designed to be the maximum value of the beam end deflection angle alphamaxMore than 90 degrees, B is the width of the web end head, | DeltaxmaxIs the maximum deviation value of the beam end allowed by the design.
4. The variable parameter precast T beam formwork system according to claim 2,
the type and quantity of the left offset web plate end die are as follows:
nz＝[(|cotαmin×B/2|-|Δx|max)/(2×|Δx|max)]rounding upwards;
the deflection angle theta corresponding to each web plate end die takes the following values:
θ＝90°-arctan(2k×|Δx|max/(B/2))，k＝1、2......nz；
the design beam end deflection angle range of the web plate end mode fitting with the deflection angle theta is as follows:
90°-arctan[(2k+1)×|Δx|max/(B/2)]to 90 ° -arctan [ (2k-1) × | Δ χmax/(B/2)]，k＝1、2......nz，
Wherein alpha isminIs to design the minimum value of the beam end deflection angle, alphaminLess than 90 degrees, B is the width of the web end, | DeltaxmaxIs the maximum deviation value of the beam end allowed by the design.
5. The variable parameter precast T beam formwork system of claim 2, wherein the declination angle of the vertical web end formwork is 90.0 °, and the fitted design beam end declination angle range is:
90°-arctan[|Δx|max/(B/2)]to 90 ° + arctan [ |. DELTA.xmax/(B/2)]，
Wherein B is the width of the web end, | DeltaxmaxIs the maximum deviation value of the beam end allowed by the design.
6. The variable parameter prefabricated T beam template system according to claim 1, wherein the lifting adjusting screw rod is locked on the cross beam of the web side die back rib support frame by an upper nut and a lower nut.
7. The variable parameter prefabricated T-beam template system as claimed in claim 1, wherein the split screw is locked on the lug plate by adopting a front nut and a rear nut III.
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