CN211772738U - Prefabricated box girder - Google Patents
Prefabricated box girder Download PDFInfo
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- CN211772738U CN211772738U CN201921825016.0U CN201921825016U CN211772738U CN 211772738 U CN211772738 U CN 211772738U CN 201921825016 U CN201921825016 U CN 201921825016U CN 211772738 U CN211772738 U CN 211772738U
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- box girder
- preformed groove
- girder body
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Abstract
The utility model provides a prefabricated box girder, which comprises a box girder body, wherein the box girder body is provided with a cavity with left and right open ends, thereby forming a box-type structure; a steel bar framework and 12 prestressed tendon hole pipes are pre-embedded in the box girder body; 12 prestressed tendon hole pipes are used for forming prestressed tendon hole channels; the top surface of the box girder body is also provided with a first reserved groove, a second reserved groove and a third reserved groove which have rectangular cross sections and are used for bundling a tensioning top plate, compared with the prior art that the tensioning is carried out by adopting pre-buried steel sheets, the utility model saves the cost of the steel sheets and reduces the dead weight of the prefabricated box girder; six air vents are further formed in the bottom of the box girder body and used for ventilating, leaking rainwater and the like.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a case roof beam technical field, especially a prefabricated case roof beam.
[ background of the invention ]
The prefabricated box girder is a box girder prefabricated in an independent site, and can be erected after the lower project is completed by combining a bridge girder erection machine, so that the project progress can be accelerated, and the construction period can be saved. As a result, precast box girders are increasingly being used. And for the prefabricated box girders, the structures of the prefabricated box girders are different according to the design of the bridge. Therefore, a new precast box girder needs to be designed for a new bridge.
[ Utility model ] content
For overcoming the defect that existing equipment exists, the utility model provides a novel prefabricated box girder, sound construction, the dead weight is lighter, practices thrift and restraints the material cost of stretch-draw.
The utility model discloses a realize like this: a precast box girder includes
The box girder comprises a box girder body, wherein the box girder body is provided with a cavity with openings at the left end and the right end, and a steel reinforcement framework and 12 prestressed tendon hole pipes are pre-embedded in the box girder body; the 12 prestressed tendon hole pipes are symmetrically distributed along the vertical central line of the box girder body, the 12 prestressed tendon hole pipes are embedded in the steel reinforcement framework, and two ends of each prestressed tendon hole pipe are open;
the top surface of the box girder body is also provided with a first preformed groove, a second preformed groove and a third preformed groove, wherein the cross sections of the first preformed groove, the second preformed groove and the third preformed groove are rectangular;
the number of the first preformed grooves is two, the two first preformed grooves are symmetrically arranged along the longitudinal central line of the box girder body, and the transverse central line of each first preformed groove is superposed with the transverse central line of the box girder body;
the number of the second reserved grooves is four, the four second reserved grooves are distributed in a rectangular shape by taking the center of the box girder body as a center, and the four second reserved grooves are positioned between the two first reserved grooves;
the number of the third preformed grooves is two, the two third preformed grooves are symmetrically arranged along the longitudinal central line of the box girder body, the transverse central line of each third preformed groove is superposed with the transverse central line of the box girder body, and the two second preformed grooves are positioned among the four second preformed grooves;
six vent holes are further formed in the bottom of the box girder body, and each vent hole is communicated with the cavity; the six vent holes are linearly distributed along the transverse center line of the box girder body and are symmetrically arranged along the longitudinal center line of the box girder body;
two outer side surfaces of the middle position of the box girder body are further provided with prefabricated midspan transverse partition plates, and the prefabricated midspan transverse partition plates are symmetrically arranged with the transverse center line and the longitudinal center line of the box girder body respectively.
Further, the total length of the box girder body is 40m, the total height is 2m, and the total width is 2.4 m.
Further, the length of the first preformed groove is 0.95m, the width of the first preformed groove is 0.8m, the depth of the first preformed groove is 0.18m, and the transverse distance between the left side edge of the first preformed groove located on the left side of the longitudinal center line and the left end of the box girder body is 3.825 m.
Furthermore, the width of each second preformed groove is 0.35m, the length of each second preformed groove is 0.8m, the depth of each second preformed groove is 0.18m, the transverse distance between the left side edge of the second preformed groove located on the same side of the longitudinal center line and the left side edge of the first preformed groove is 3.825m, and the distance between the two second preformed grooves located on the same side of the longitudinal center line is 0.7 m.
Further, the length of the third preformed groove is 1.35m, the width of the third preformed groove is 0.8m, the depth of the third preformed groove is 0.18m, and the transverse distance between the left side edge of the third preformed groove located on the left side of the longitudinal center line and the left side edge of the second preformed groove is 3 m.
Further, the diameter of each of the vent holes is 0.1 m.
Further, the thickness of the prefabricated midspan transverse partition plate is 0.2 m.
The utility model has the advantages that: a prefabricated box girder comprises a box girder body, wherein the box girder body is provided with a cavity with left and right ends open, so that a box-type structure is formed; a steel bar framework and 12 prestressed tendon hole pipes are pre-embedded in the box girder body; 12 prestressed tendon hole pipes are used for forming prestressed tendon hole channels; the top surface of the box girder body is also provided with a first reserved groove, a second reserved groove and a third reserved groove which have rectangular cross sections and are used for bundling a tensioning top plate, compared with the prior art that the tensioning is carried out by adopting pre-buried steel sheets, the utility model saves the cost of the steel sheets and reduces the dead weight of the prefabricated box girder; six air vents are further formed in the bottom of the box girder body and used for ventilating, leaking rainwater and the like.
[ description of the drawings ]
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a top view of the precast box girder of the present invention.
Fig. 2 is a sectional view a-a in fig. 1.
Fig. 3 is a sectional view B-B in fig. 2.
Fig. 4 is a cross-sectional view taken along line C-C of fig. 2.
Fig. 5 is a side view of the precast box girder according to the present invention.
Fig. 6 is a side view of the steel reinforcement cage of the present invention.
Fig. 7 is a front view of the steel bar framework of the present invention.
Description of reference numerals:
the box girder comprises a box girder body 100, a cavity 101, a steel reinforcement framework 102, a prestressed tendon hole pipe 103, a first reserved groove 104, a second reserved groove 105, a third reserved groove 106, an air vent 107, a prefabricated midspan diaphragm plate 108, a longitudinal center line 109, a longitudinal steel bar 110 and a transverse steel bar 111;
length L1, width b1, depth h of the first pre-groove, lateral spacing L6 of the left side of the first pre-groove to the left end of the box girder body to the left of the longitudinal centerline 109.
The width b2, the length L2 and the depth h of the second preformed groove, the transverse distance L7 between the left side edge of the second preformed groove and the left side edge of the first preformed groove which are positioned on the same side of the longitudinal center line, and the distance L9 between two second preformed grooves which are positioned on the same side of the longitudinal center line.
Length L3, width b3, depth h of the third pregroove, lateral spacing L8 between the left side of the third pregroove and the left side of the second pregroove to the left of the longitudinal centerline.
The center distance between two adjacent vent holes is L4; and the distance L5 between the vent holes at the leftmost end and the left end part of the prefabricated box girder.
[ detailed description ] embodiments
Referring to figures 1 through 7 of the drawings,
description of the drawings: fig. 1 shows only half spans of the prefabricated box girder, and the other half spans are symmetrically arranged with respect to a longitudinal center line 109.
The depths h of the first preformed groove 104, the second preformed groove 105 and the third preformed groove 106 are equal and are all marked by reference sign h.
The utility model provides a prefabricated box girder, include
The box girder comprises a box girder body 100, wherein the box girder body 100 is provided with a cavity 101 with openings at the left end and the right end so as to form a box-type structure, and a steel bar framework 102 and 12 prestressed tendon hole pipes 103 are pre-embedded in the box girder body 100; as shown in fig. 6, 12 tendon hole pipes 103 are symmetrically distributed around the vertical center line of the box girder body 100, and 12 tendon hole pipes 103 are embedded in the steel reinforcement framework 102, and two ends of each tendon hole pipe 103 are open; the prestressed tendon hole pipe 103 is used for forming a prestressed duct.
The top surface of the box girder body 100 is also provided with a first preformed groove 104, a second preformed groove 105 and a third preformed groove 106 with rectangular cross sections; first preformed groove 104, second preformed groove 105 and third preformed groove 106 are used for roof to restraint the stretch-draw, compare in the present pre-buried steel sheet of adoption and restraint the stretch-draw, the utility model discloses practice thrift the cost of steel sheet, reduced the dead weight of precast box girder simultaneously.
As shown in fig. 1, there are two first preformed grooves 104, two first preformed grooves 104 are symmetrically arranged with a longitudinal centerline 109 of the box girder body 100, and a transverse centerline of each first preformed groove 104 coincides with a transverse centerline of the box girder body 104;
the number of the second preformed grooves 105 is four, the four second preformed grooves 105 are distributed in a rectangular shape around the center of the box girder body 100, and the four second preformed grooves 105 are positioned between the two first preformed grooves 104;
two third preformed grooves 106 are arranged, the two third preformed grooves 106 are symmetrically arranged with a longitudinal center line 109 of the box girder body 100, a transverse center line of each third preformed groove 106 is coincident with a transverse center line of the box girder body 100, and the two second preformed grooves 106 are positioned between the four second preformed grooves 105;
six vent holes 107 are further formed in the bottom of the box girder body 100, and each vent hole 107 is communicated with the cavity 101 and used for ventilating, leaking rainwater and the like; the six vent holes 107 are linearly distributed along the transverse center line of the box girder body 100 and are symmetrically arranged with the longitudinal center line 109 of the box girder body 100; in the specific implementation, when the position of the vent hole 107 interferes with the common steel bar, the position of the common steel bar can be properly moved, and certainly, the position is not moved if the common steel bar is prestressed.
Two outer side surfaces of the middle position of the box girder body 100 are further provided with prefabricated midspan diaphragm plates 108, and the prefabricated midspan diaphragm plates 108 are symmetrically arranged with a transverse center line and a longitudinal center line 109 of the box girder body 100 respectively.
In a specific embodiment, a small box girder is prefabricated by 40m in a great bridge of a east lake pond of Ningde city built by Fujian province and Huqi construction engineering Co., Ltd;
the box girder body 100 has a total length of 40m, a total height of 2m and a total width of 2.4 m.
The length L1 of the first pregroove 104 is 0.95m, the width b1 is 0.8m, the depth h is 0.18m, and the transverse distance L6 between the left side edge of the first pregroove 104 located on the left side of the longitudinal centerline 109 and the left end of the box girder body 100 is 3.825 m.
Each second preformed groove 105 has a width b2 of 0.35m, a length L2 of 0.8m, a depth h of 0.18m, a transverse distance L7 between the left side edge of the second preformed groove 105 and the left side edge of the first preformed groove 104 on the same side of the longitudinal centerline 109 of 3.825m, and a distance L9 between the two second preformed grooves 105 on the same side of the longitudinal centerline 109 of 0.7 m.
The third pregroove 106 has a length L3 of 1.35m, a width b3 of 0.8m, a depth h of 0.18m, and a lateral distance L8 between the left side of the third pregroove 106 and the left side of the second pregroove 106 on the left side of the longitudinal centerline 109 of 3 m.
The diameter of each of the vent holes 107 is 0.1 m. The center distance between two adjacent vent holes 107 is L4-2.5 m; the distance L5 between the ventilation hole 107 at the leftmost end and the left end part of the precast box girder is 4.725 m;
the thickness of the prefabricated midspan diaphragm 108 is 0.2 m.
In the concrete implementation, a plurality of circular concrete cushion blocks are further sleeved on the steel bars of the steel bar framework 102 and placed under the beams to expand the bearing area and fix the positions of the steel bars so as to avoid the corrosion caused by the exposed steel bars. A plurality of transverse steel bars 111 and longitudinal steel bars 110 are laid on the top surface of the steel reinforcement framework 102 to form a steel reinforcement mesh for pouring the top plate of the prefabricated box girder; wherein longitudinal reinforcement 110 folds back the shape at the tip, makes things convenient for follow-up adjacent prefabricated box girder to weld, improves the firm in connection degree.
Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.
Claims (7)
1. A precast box girder, its characterized in that: comprises that
The box girder comprises a box girder body, wherein the box girder body is provided with a cavity with openings at the left end and the right end, and a steel reinforcement framework and 12 prestressed tendon hole pipes are pre-embedded in the box girder body; the 12 prestressed tendon hole pipes are symmetrically distributed along the vertical central line of the box girder body, the 12 prestressed tendon hole pipes are embedded in the steel reinforcement framework, and two ends of each prestressed tendon hole pipe are open;
the top surface of the box girder body is also provided with a first preformed groove, a second preformed groove and a third preformed groove, wherein the cross sections of the first preformed groove, the second preformed groove and the third preformed groove are rectangular;
the number of the first preformed grooves is two, the two first preformed grooves are symmetrically arranged along the longitudinal central line of the box girder body, and the transverse central line of each first preformed groove is superposed with the transverse central line of the box girder body;
the number of the second reserved grooves is four, the four second reserved grooves are distributed in a rectangular shape by taking the center of the box girder body as a center, and the four second reserved grooves are positioned between the two first reserved grooves;
the number of the third preformed grooves is two, the two third preformed grooves are symmetrically arranged along the longitudinal central line of the box girder body, the transverse central line of each third preformed groove is superposed with the transverse central line of the box girder body, and the two second preformed grooves are positioned among the four second preformed grooves;
six vent holes are further formed in the bottom of the box girder body, and each vent hole is communicated with the cavity; the six vent holes are linearly distributed along the transverse center line of the box girder body and are symmetrically arranged along the longitudinal center line of the box girder body;
two outer side surfaces of the middle position of the box girder body are further provided with prefabricated midspan transverse partition plates, and the prefabricated midspan transverse partition plates are symmetrically arranged with the transverse center line and the longitudinal center line of the box girder body respectively.
2. A precast box girder according to claim 1, wherein: the total length of the box girder body is 40m, the total height is 2m, and the total width is 2.4 m.
3. A precast box girder according to claim 2, wherein: the length of the first preformed groove is 0.95m, the width of the first preformed groove is 0.8m, the depth of the first preformed groove is 0.18m, and the transverse distance between the left side edge of the first preformed groove located on the left side of the longitudinal center line and the left end of the box girder body is 3.825 m.
4. A precast box girder according to claim 3, wherein: each second preformed groove is 0.35m in width, 0.8m in length and 0.18m in depth, the transverse distance between the left side edge of the second preformed groove and the left side edge of the first preformed groove which are positioned on the same side of the longitudinal center line is 3.825m, and the distance between the two second preformed grooves which are positioned on the same side of the longitudinal center line is 0.7 m.
5. A precast box girder according to claim 4, wherein: the length of the third preformed groove is 1.35m, the width of the third preformed groove is 0.8m, the depth of the third preformed groove is 0.18m, and the transverse distance between the left side edge of the third preformed groove positioned on the left side of the longitudinal center line and the left side edge of the second preformed groove is 3 m.
6. A precast box girder according to claim 1, wherein: the diameter of each vent hole is 0.1 m.
7. A precast box girder according to claim 1, wherein: the thickness of the prefabricated midspan transverse partition plate is 0.2 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921825016.0U CN211772738U (en) | 2019-10-28 | 2019-10-28 | Prefabricated box girder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921825016.0U CN211772738U (en) | 2019-10-28 | 2019-10-28 | Prefabricated box girder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211772738U true CN211772738U (en) | 2020-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921825016.0U Active CN211772738U (en) | 2019-10-28 | 2019-10-28 | Prefabricated box girder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211772738U (en) |
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2019
- 2019-10-28 CN CN201921825016.0U patent/CN211772738U/en active Active
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