CN222435051U - Self-stress joint structure suitable for oblique butt strap connection - Google Patents
Self-stress joint structure suitable for oblique butt strap connection Download PDFInfo
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- CN222435051U CN222435051U CN202421761143.XU CN202421761143U CN222435051U CN 222435051 U CN222435051 U CN 222435051U CN 202421761143 U CN202421761143 U CN 202421761143U CN 222435051 U CN222435051 U CN 222435051U
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- 210000002435 tendon Anatomy 0.000 claims description 44
- 210000001503 joint Anatomy 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 6
- 230000009191 jumping Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model relates to a self-stress seam structure suitable for connecting an inclined strap, which comprises a front strap, a rear strap, a longitudinal self-stress rib and a transverse self-stress rib, and is characterized in that: the rear end of the front butt strap is connected with the rear butt strap through a folded self-stress seam, the folded self-stress seam is composed of a center seam and a side seam, a longitudinal self-stress rib and a transverse self-stress rib are arranged in the folded self-stress seam, the transverse self-stress rib and the longitudinal self-stress rib are bound and fixed, two ends of the longitudinal self-stress rib are respectively anchored in the front butt strap and the rear butt strap, and high-expansion concrete is poured in the folded self-stress seam. According to the self-stress seam structure, under the expansion action of high-expansion concrete, all parts of the outer end surfaces of the front and rear butt straps are subjected to equal compressive stress, and under the action of vehicle load, the two sides of the self-stress seam are not easy to crack, so that the problems that the two sides of a connecting seam are easy to crack and the service life of the butt strap is influenced due to the fact that the oblique butt strap adopts self-stress straight seam connection are solved.
Description
Technical Field
The utility model relates to a self-stress seam structure, in particular to a self-stress seam structure suitable for connecting an inclined butt strap.
Background
With the rapid development of economy in China, heavy traffic is obviously increased, and bridge head jumping is a common phenomenon, wherein the reason for the bridge head jumping is that due to the fact that the mechanical properties of foundations of a bridge high-filling road section and a bridge road section are different, under the repeated action of the load of a running vehicle, a certain degree of settlement is finally caused at the adjacent position of a common road section and the bridge road section, and when the vehicle passes through the position, obvious jolt is caused, commonly called jumping occurs.
At present, in order to prevent the phenomenon of bridge head jumping in a bridge high-filling road section, part of bridge butt straps are made into assembly type prestress ultra-long butt straps, and in order to facilitate prefabrication and transportation of the butt straps, the existing prestress ultra-long butt straps are generally composed of a plurality of butt straps, and the butt straps are connected together in an assembly mode after being transported to the site. In the practical application process, for the rectangular butt strap, the adjacent butt straps can be connected by adopting self-stress straight slits, and the length direction of the self-stress straight slits is perpendicular to the longitudinal direction of the butt strap, so the rectangular butt strap is also called an orthogonal butt strap. Under the influence of the trend of roads, non-rectangular parallelogram access boards are sometimes used, commonly called diagonal access boards, and at present, a self-stress seam connection scheme is not available for the connection of the diagonal access boards.
Disclosure of Invention
In order to overcome the defects of the technical problems, the utility model provides a self-stress seam structure suitable for connecting an inclined butt strap.
The utility model relates to a self-stress seam structure suitable for connecting an inclined strap, which comprises a front strap, a rear strap, longitudinal self-stress tendons and transverse self-stress tendons, wherein the front strap and the rear strap are both parallelograms, the front end of the front strap is arranged on brackets of a bridge front wall, and the self-stress seam structure is characterized in that the rear end of the front strap is connected with the rear strap through a folded self-stress seam, the folded self-stress seam consists of a middle seam positioned at the middle part and side seams positioned at two ends of the middle seam, the middle seam is parallel to the transverse edges of the front strap and the rear strap, the side seams are perpendicular to the longitudinal edges of the front strap and the rear strap, the folded self-stress seam is internally provided with the longitudinal self-stress tendons and the transverse self-stress tendons, the transverse self-stress tendons are fixedly bound with the longitudinal self-stress tendons, the two ends of the longitudinal self-stress tendons are respectively anchored in the front strap and the rear strap, and the folded self-stress seam is poured with high-expansion concrete.
The self-stress joint structure suitable for the connection of the inclined butt strap is characterized in that the longitudinal self-stress tendons in the middle joint and the side joint are perpendicular to the length direction of the middle joint and the side joint respectively, and the transverse self-stress tendons in the middle joint and the side joint are perpendicular to the longitudinal self-stress tendons.
The self-stress seam structure suitable for the connection of the inclined butt strap has the advantages that the widths of the middle seam and the side seam are 40 cm-50 cm, the height is equal to the heights of the front butt strap and the rear butt strap, and the length of the side seam is 80 cm-150 cm.
The self-stress seam structure suitable for the connection of the inclined butt strap is characterized in that the longitudinal self-stress generated by the folded self-stress seam is 2-4 MPa, and the strength of high-expansion concrete is 35-45 MPa.
The self-stress joint structure suitable for the connection of the inclined butt strap is characterized in that the longitudinal self-stress tendons adopt double-row secondary steel bars with the diameter of 18-25 mm, the anchoring length of the longitudinal self-stress tendons in the front butt strap and the rear butt strap is not smaller than 30 times of the diameter of the longitudinal self-stress tendons, the transverse spacing of the longitudinal self-stress tendons in the middle joint is 15-20 cm, and the transverse spacing of the longitudinal self-stress tendons in the side joint is 12-17 cm.
The self-stress joint structure suitable for the connection of the inclined butt strap is characterized in that the transverse self-stress tendons adopt secondary steel bars with the diameters of 16 mm-18 mm, and the transverse self-stress tendons are distributed in four rows up and down.
The self-stress seam structure suitable for the connection of the inclined butt strap has the advantages that the inclined front butt strap and the inclined rear butt strap are connected through the folded self-stress seam formed by the middle seam and the two side seams, the length directions of the middle seam and the side seams are respectively parallel to the transverse edges of the butt strap and perpendicular to the longitudinal variation of the butt strap, and the longitudinal self-stress tendons in the middle seam and the side seams are perpendicular to the outer end faces of the butt strap and are anchored in the outer end faces of the butt strap, so that after the transverse self-stress tendons are bound to the longitudinal self-stress tendons and high-expansion concrete is poured, the firm connection between the front butt strap and the rear butt strap is realized, under the expansion action of the high-expansion concrete, all parts of the outer end faces of the front butt strap and the rear butt strap are subjected to equal compressive stress, and under the action of vehicle load, the two sides of the self-stress seam are not prone to crack, and the problem that cracks are prone to occur on two sides of the connecting seam and the service life of the inclined butt strap due to the self-stress straight seam connection is solved.
Drawings
FIG. 1 is a schematic structural view of a self-stress slit structure suitable for connection of an oblique strap of the present utility model;
FIG. 2 is a cross-sectional view taken along section A-A of FIG. 1;
fig. 3 is a view showing a use state of the self-stress slit structure suitable for the connection of the oblique butt strap of the present utility model.
In the figure, a bridge front wall, a front butt strap, a rear butt strap, a 4-fold self-stress seam, a 5 middle seam, a 6 side seam, a 7-longitudinal self-stress rib, a 8-transverse self-stress rib, 9 high expansion concrete, a 10 gray soil layer, 11 corbels, 12 asphalt felt and 13 asphalt layer are arranged.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
The self-stress seam structure suitable for the diagonal strap connection is shown in fig. 1, which shows a schematic structural view of the self-stress seam structure suitable for the diagonal strap connection of the utility model, fig. 2 shows a cross section of A-A in fig. 1, fig. 3 shows a use state view of the self-stress seam structure suitable for the diagonal strap connection of the utility model, the self-stress seam structure suitable for the diagonal strap connection is composed of a front strap 2, a rear strap 3, a folded self-stress seam 4, a longitudinal self-stress rib 7, a transverse self-stress rib 8 and high-expansion concrete 9, the front strap 2 and the rear strap 3 are non-rectangular parallelograms, the front strap 2 and the rear strap 3 are adjacently arranged at a certain distance, the folded self-stress seam 4 is formed by the distance between the front strap 2 and the rear strap 3, and the front end of the front strap 2 is arranged on a bracket 11 of a front wall 1 of a bridge.
The folded self-stress slit 4 shown is formed by a middle slit 5 at the middle and side slits 6 at both ends of the middle slit 5, thus forming the folded self-stress slit 4 in the form of "side slit + middle slit + side slit". The length direction of the center seam 5 is parallel to the lateral edges of the access panels (i.e., the front access panel 2 and the rear access panel 3), and the length direction of the edge seam 6 is perpendicular to the longitudinal edges of the access panels. The middle joint 5 and the side joint 6 are respectively provided with a transverse self-stressing rib 7 at intervals, the longitudinal self-stressing ribs 7 in the middle joint 5 and the side joint 6 are perpendicular to the outer end face of the butt strap, and two ends of the longitudinal self-stressing ribs 7 are respectively anchored in the front butt strap 2 and the rear butt strap 3. The transverse self-stressing tendons 8 are arranged along the length direction of the folded self-stressing joints 4, the transverse self-stressing tendons 8 are fixed with the longitudinal self-stressing tendons 7 in a binding mode, and the transverse self-stressing tendons 8 are perpendicular to the longitudinal self-stressing tendons 7.
Thus, after the high expansion concrete 9 is poured into the folded self-stress joint 4 and curing is finished, under the expansion action of the high expansion concrete 9, compressive stress can be applied to the front lapping plate 2 and the rear lapping plate 3, and in the process of applying pressure to the front lapping plate 2 and the rear lapping plate 3 under the load action of a running vehicle, the pressed front lapping plate 2 and the pressed rear lapping plate 3 can counteract the tensile stress brought by the running of the vehicle, meanwhile, as the transverse self-stress tendons 7 are perpendicular to the end surfaces of the lapping plates, the stress of the front lapping plate 2 and the rear lapping plate 3 is uniform and equal, the end parts of the front lapping plate 2 and the rear lapping plate 3 at two sides of the folded self-stress joint 4 can be effectively prevented from cracking, and the problems that cracks are easy to appear at two sides of the connecting joint and the service life of the lapping plate are influenced due to the fact that the inclined plate adopts self-stress straight joint connection are solved.
As shown in fig. 3, the gray soil layer 10 is arranged below the front butt strap 2 and the rear butt strap 3, the bracket 11 is arranged on the bridge front wall 1, the front end of the front butt strap 2 is arranged on the bracket 11, an oilfelt is arranged between the lower side of the front butt strap 2 and the bracket 11, a vertical upward reinforcing steel bar is fixed on the bracket 11, a reinforcing steel bar hole matched with the reinforcing steel bar is formed in the lower surface of the front end of the front butt strap 2, the front butt strap 2 is inserted into the reinforcing steel bar hole through the reinforcing steel bar on the bracket 11 to realize connection and installation with the bracket, and the asphalt layer 13 is arranged between the front end face of the front butt strap 2 and the bridge front wall 1.
The width of the middle seam 5 and the width of the side seam 6 are 40 cm-50 cm, the height of the middle seam are equal to the height of the front butt strap 2 and the rear butt strap 3, and the length of the side seam 6 is 80 cm-150 cm. The longitudinal self-stress generated by the folded self-stress joint 4 is 2-4 MPa, and the strength of the high-expansion concrete 9 is 35-45 MPa.
The longitudinal self-stressing tendons 7 are double-row secondary steel bars with the diameter of 18 mm-25 mm, the anchoring length of the longitudinal self-stressing tendons 7 in the front butt strap 2 and the rear butt strap 3 is not smaller than 30 times of the diameter of the longitudinal self-stressing tendons 7, the transverse spacing of the longitudinal self-stressing tendons 7 in the middle joint 5 is 15 cm-20 cm, and the transverse spacing of the longitudinal self-stressing tendons 7 in the side joint 6 is 12 cm-17 cm. The transverse self-stressing tendons 8 are arranged in an up-down double row mode by adopting secondary reinforcing steel bars with diameters of 16 mm-18 mm.
In the construction process of the self-stress joint structure suitable for connecting the inclined butt strap, the front butt strap 2 and the rear butt strap 3 are prefabricated according to the actual road size in a factory, and in the prefabrication process, the longitudinal self-stress ribs 7 are prefabricated in the front butt strap 2 and the rear butt strap 3 in a two-section mode. The prefabricated front butt strap 2 and the prefabricated rear butt strap 3 are transported to a construction site, the front butt strap 2 and the prefabricated rear butt strap 3 are put in place, then the two aligned sections of longitudinal self-stressing tendons 7 are welded together, the transverse self-stressing tendons 8 are bundled after the welding is finished, finally pouring of high-expansion concrete 9 is carried out, and the self-stressing joint structure suitable for connecting the inclined butt straps is formed after pouring and curing.
Claims (6)
1. The self-stress seam structure suitable for the connection of the inclined butt strap comprises a front butt strap (2), a rear butt strap (3), longitudinal self-stress ribs (7) and transverse self-stress ribs (8), wherein the front butt strap and the rear butt strap are both parallelograms, the front end of the front butt strap is arranged on a bracket (11) of a bridge front wall (1), and the self-stress seam structure is characterized in that the rear end of the front butt strap is connected with the rear butt strap through a folded self-stress seam (4), the folded self-stress seam is formed by a middle seam (5) positioned in the middle part and side seams (6) positioned at two ends of the middle seam, the middle seam is parallel to the transverse edges of the front butt strap and the rear butt strap, the side seams are perpendicular to the longitudinal edges of the front butt strap and the rear butt strap, the folded self-stress ribs and the transverse self-stress ribs are arranged in the folded self-stress seams to be fixed, the two ends of the longitudinal self-stress ribs are respectively anchored in the front butt strap and the rear butt strap, and high-expansion concrete (9) is poured in the folded self-stress seam.
2. The self-stress joint structure suitable for the connection of the inclined butt strap according to claim 1, wherein the longitudinal self-stress tendons (7) in the middle joint (5) and the side joint (6) are respectively perpendicular to the length directions of the middle joint and the side joint, and the transverse self-stress tendons in the middle joint and the side joint are respectively perpendicular to the longitudinal self-stress tendons (7).
3. The self-stress seam structure suitable for connecting the inclined butt strap according to claim 1 or 2, wherein the width of the middle seam (5) and the width of the side seam (6) are 40 cm-50 cm, the height of the side seam are equal to the heights of the front butt strap (2) and the rear butt strap (3), and the length of the side seam is 80 cm-150 cm.
4. The self-stress joint structure suitable for connecting the inclined butt strap according to claim 1 or 2, wherein the longitudinal self-stress generated by the folded self-stress joint (4) is 2-4 MPa, and the strength of the high-expansion concrete (9) is 35-45 MPa.
5. The self-stress joint structure suitable for the connection of the inclined butt strap is characterized in that the longitudinal self-stress tendons (7) are double-row secondary steel bars with the diameter of 18-25 mm, the anchoring length of the longitudinal self-stress tendons in the front butt strap and the rear butt strap is not smaller than 30 times of the diameter of the longitudinal self-stress tendons, the transverse distance of the longitudinal self-stress tendons in the middle joint (5) is 15-20 cm, and the transverse distance of the longitudinal self-stress tendons in the side joint (6) is 12-17 cm.
6. The self-stress joint structure suitable for connecting the inclined butt strap according to claim 1 or 2 is characterized in that the transverse self-stress tendons (8) are two-stage steel bars with the diameter of 16 mm-18 mm, and the transverse self-stress tendons are distributed in four rows up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421761143.XU CN222435051U (en) | 2024-07-24 | 2024-07-24 | Self-stress joint structure suitable for oblique butt strap connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421761143.XU CN222435051U (en) | 2024-07-24 | 2024-07-24 | Self-stress joint structure suitable for oblique butt strap connection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222435051U true CN222435051U (en) | 2025-02-07 |
Family
ID=94401637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421761143.XU Active CN222435051U (en) | 2024-07-24 | 2024-07-24 | Self-stress joint structure suitable for oblique butt strap connection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222435051U (en) |
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2024
- 2024-07-24 CN CN202421761143.XU patent/CN222435051U/en active Active
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