Self-stress seam structure suitable for inclined butt strap connection
By adopting a folded self-stressed joint structure at the connection of the oblique cross-blocking plate, combined with the design of longitudinal and transverse self-stressed ribs and high-expanded concrete, the problem of easy cracking of the connection joint of the oblique cross-blocking plate in the existing technology is solved, and the bonding is realized The board is securely connected and the service life is extended.
Patent Information
- Application Number
- CN202421761143.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-07-24
AI Technical Summary
There is a lack of a self-stress joint solution suitable for oblique cross-blocking plate connection in the prior art, resulting in cracks on both sides of the connecting seams, affecting the life of the board.
Folded self-stressing joint structure, including the middle seam and edge seam, the middle seam is parallel to the horizontal edge of the plaster, the edge seam is perpendicular to the longitudinal edge of the plaster, and longitudinal and transverse self-stressing ribs are set in the middle seam and edge seam, and the seam is placed in the seam. Pour high-expanded concrete.
Through the design of the folded self-stressed joint structure, a firm connection between the front and rear plates is achieved. Under the expansion of high-expanded concrete, the outer end surface of the plate is subjected to uniform stress, avoiding cracks on both sides of the connecting joints. Extend the service life of the board.
Smart Images
Figure CN222435051U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a self-stressed seam structure, in particular to a self-stressed seam structure suitable for connecting oblique lap plates. Background Art
[0002] With the rapid development of my country's economy, heavy-load traffic has increased significantly, and vehicle jumping at bridge heads has become a common phenomenon. The reason for vehicle jumping at bridge heads is that the mechanical properties of the foundations of the high-fill section of the bridge and the bridge section are different. Under the repeated action of the load of moving vehicles, it will eventually cause a certain degree of settlement at the adjacent position of the ordinary section and the bridge section. When the vehicle passes this position, there will be an obvious bump, commonly known as vehicle jumping.
[0003] At present, in order to prevent the bridge head from jumping off the bridge in the high-fill section of the bridge, some bridge scaffoldings have been made into assembled prestressed super-long scaffoldings. In order to facilitate the prefabrication and transportation of the scaffoldings, the existing prestressed super-long scaffoldings are usually composed of multiple scaffoldings, which are connected together by assembly after being transported to the site. In actual application, for rectangular scaffoldings, adjacent scaffoldings can be connected by self-stressed straight seams. Since the length direction of the self-stressed straight seams is perpendicular to the longitudinal direction of the scaffoldings, the rectangular scaffoldings are also called orthogonal scaffoldings. Due to the influence of the road direction, non-rectangular parallelogram scaffoldings are sometimes used, commonly known as diagonal scaffoldings. At present, there is still a lack of self-stressed seam connection solutions for the connection of diagonal scaffoldings. Summary of the invention
[0004] In order to overcome the disadvantages of the above technical problems, the utility model provides a self-stressed seam structure suitable for connecting oblique lap plates.
[0005] The utility model discloses a self-stressed seam structure suitable for connecting oblique slats, comprising a front slat, a rear slat, a longitudinal self-stressed rib and a transverse self-stressed rib, the front slat and the rear slat are both parallelograms, and the front end of the front slat is installed on the bracket of the front wall of the bridge; the utility model is characterized in that the rear end of the front slat is connected with the rear slat via a folded self-stressed seam, the folded self-stressed seam is composed of a middle seam located in the middle part and side seams located at both ends of the middle seam, the middle seam is parallel to the transverse sides of the front slat and the rear slat, and the side seams are perpendicular to the longitudinal sides of the front slat and the rear slat; longitudinal self-stressed ribs and transverse self-stressed ribs are arranged in the folded self-stressed seam, the transverse self-stressed ribs are tied and fixed to the longitudinal self-stressed ribs, the two ends of the longitudinal self-stressed rib are respectively anchored in the front slat and the rear slat, and high expansion concrete is poured in the folded self-stressed seam.
[0006] The utility model is suitable for a self-stressed seam structure connected with oblique lap plates, wherein the longitudinal self-stressed tendons in the middle seam and the side seams are respectively perpendicular to the length directions of the middle seam and the side seams, and the transverse self-stressed tendons in the middle seam and the side seams are perpendicular to the longitudinal self-stressed tendons.
[0007] The utility model is suitable for a self-stressed seam structure connected with oblique straps, wherein the width of the middle seam and the side seams is 40 cm to 50 cm, the height is the same as that of the front strap and the rear strap, and the length of the side seams is 80 cm to 150 cm.
[0008] The utility model is suitable for a self-stressed joint structure connected with oblique lap plates, the longitudinal self-stress generated by the folded self-stressed joint is 2MPa-4MPa, and the strength of the high expansion concrete is 35MPa-45MPa.
[0009] The utility model is suitable for a self-stressed seam structure connected with oblique lap plates, wherein the longitudinal self-stressed tendons adopt double-row secondary steel bars with a diameter of 18 mm to 25 mm, and the anchorage length of the longitudinal self-stressed tendons in the front lap plate and the rear lap plate is not less than 30 times of the diameter thereof; the transverse spacing of the longitudinal self-stressed tendons in the middle seam is 15 cm to 20 cm, and the transverse spacing of the longitudinal self-stressed tendons in the side seams is 12 cm to 17 cm.
[0010] The utility model is suitable for a self-stressed seam structure connected with oblique lap plates, wherein the transverse self-stressed tendons are secondary steel bars with a diameter of 16 mm to 18 mm, and the transverse self-stressed tendons are arranged in upper and lower double rows, with a total of four tendons.
[0011] The beneficial effects of the utility model are as follows: the utility model is suitable for the self-stressed seam structure of the oblique strap connection, the oblique front strap and the rear strap are connected via the folded self-stressed 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 sides of the strap and perpendicular to the longitudinal direction of the strap, and the longitudinal self-stressed tendons in the middle seam and the side seams are perpendicular to the outer end surface of the strap and anchored therein, so that when the transverse self-stressed tendons are tied to the longitudinal self-stressed tendons and high-expansion concrete is poured, a firm connection between the front and rear straps is achieved, and under the expansion effect of the high-expansion concrete, each part of the outer end surface of the front and rear straps is subjected to equal compressive stress, and under the action of vehicle load, the two sides of the self-stressed seam are not easy to crack, which solves the problem that the two sides of the connection seam are prone to cracks and the service life of the strap is affected due to the self-stressed straight seam connection of the oblique strap. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the self-stressed joint structure suitable for oblique lap plate connection of the utility model;
[0013] Figure 2 for Figure 1 Sectional view of section AA;
[0014] Figure 3 This is a usage state diagram of the self-stressed joint structure suitable for oblique lap plate connection of the utility model.
[0015] In the figure: 1 front wall of the bridge, 2 front slab, 3 rear slab, 4 folded self-stressed joint, 5 middle joint, 6 side joint, 7 longitudinal self-stressed reinforcement, 8 transverse self-stressed reinforcement, 9 high expansion concrete, 10 lime soil layer, 11 corbel, 12 oil felt, 13 asphalt layer. DETAILED DESCRIPTION
[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0017] like Figure 1 As shown, a schematic diagram of the structure of the self-stressed joint structure suitable for oblique lap plate connection of the utility model is given. Figure 2 Given Figure 1 The cross-sectional view of section AA in the figure, Figure 3 A use state diagram of the self-stressed joint structure suitable for oblique slat connection of the utility model is given, and the self-stressed joint structure suitable for oblique slat connection shown is composed of a front slat 2, a rear slat 3, a folded self-stressed joint 4, a longitudinal self-stressed rib 7, a transverse self-stressed rib 8 and a high expansion concrete 9. The front slat 2 and the rear slat 3 are both non-rectangular parallelograms. The front slat 2 and the rear slat 3 are adjacently arranged at a certain distance, and the distance between the front slat 2 and the rear slat 3 forms a folded self-stressed joint 4; the front end of the front slat 2 is installed on the corbel 11 of the front wall 1 of the bridge.
[0018] The folded self-stressing seam 4 shown is composed of a middle seam 5 located in the middle and side seams 6 located at both ends of the middle seam 5, so that a folded self-stressing seam 4 in the form of "side seam + middle seam + side seam" is formed. The length direction of the middle seam 5 is parallel to the transverse side of the strap (i.e., the front strap 2 and the rear strap 3), and the length direction of the side seam 6 is perpendicular to the longitudinal side of the strap. Transverse self-stressing ribs 7 are arranged at intervals in the middle seam 5 and the side seams 6, and the longitudinal self-stressing ribs 7 in the middle seam 5 and the side seams 6 are perpendicular to the outer end surface of the strap, and the two ends of the longitudinal self-stressing ribs 7 are anchored in the front strap 2 and the rear strap 3 respectively. The transverse self-stressing ribs 8 are arranged along the length direction of the folded self-stressing seam 4, and the transverse self-stressing ribs 8 are fixed to the longitudinal self-stressing ribs 7 by binding, and the transverse self-stressing ribs 8 are perpendicular to the longitudinal self-stressing ribs 7.
[0019] In this way, when the high-expansion concrete 9 is poured in the folded self-stress joint 4 and cured, the front strap 2 and the rear strap 3 can be subjected to compressive stress under the expansion effect of the high-expansion concrete 9. In the process of applying pressure to the front strap 2 and the rear strap 3 under the load of the moving vehicle, the compressed front strap 2 and the rear strap 3 can offset the tensile stress caused by the movement of the vehicle. At the same time, since the transverse self-stress ribs 7 are perpendicular to the end faces of the straps, the front strap 2 and the rear strap 3 are subjected to uniform and equal stress at all locations, which can effectively avoid the end portions of the front strap 2 and the rear strap 3 on both sides of the folded self-stress joint 4 from cracking, and solve the problem that cracks are prone to appear on both sides of the connection seam due to the self-stress straight seam connection of the inclined plate, which affects the service life of the strap.
[0020] like Figure 3 As shown, there is a ash soil layer 10 below the front plate 2 and the rear plate 3, a corbel 11 is provided on the front wall 1 of the bridge, the front end of the front plate 2 is installed on the corbel 11, oil felt is provided between the bottom of the front plate 2 and the corbel 11, vertically upward steel bars are fixed on the corbel 11, and steel bar holes matching with the steel bars are opened on the lower surface of the front end of the front plate 2. The front plate 2 is connected and installed with the corbel by inserting the steel bars on the corbel 11 into the steel bar holes; an asphalt layer 13 is provided between the front end surface of the front plate 2 and the front wall 1 of the bridge.
[0021] The width of the middle seam 5 and the side seam 6 is 40 cm to 50 cm, and the height is the same as the front slab 2 and the rear slab 3. The length of the side seam 6 is 80 cm to 150 cm. The longitudinal self-stress generated by the folded self-stress seam 4 is 2 MPa to 4 MPa, and the strength of the high expansion concrete 9 is 35 MPa to 45 MPa.
[0022] The longitudinal self-stressing tendons 7 shown are made of double-row secondary steel bars with a diameter of 18mm-25mm, and the anchorage length of the longitudinal self-stressing tendons 7 in the front slats 2 and the rear slats 3 is not less than 30 times of their diameters; the transverse spacing of the longitudinal self-stressing tendons 7 in the middle seam 5 is 15cm-20cm, and the transverse spacing of the longitudinal self-stressing tendons 7 in the side seams 6 is 12cm-17cm. The transverse self-stressing tendons 8 shown are made of secondary steel bars with a diameter of 16mm-18mm, and the transverse self-stressing tendons 8 are arranged in double rows up and down, with a total of four tendons.
[0023] During the construction process of the self-stressed seam structure suitable for connecting oblique slats of the utility model, the front slats 2 and the rear slats 3 are first prefabricated in the factory according to the actual road size. During the prefabrication process, the longitudinal self-stressed tendons 7 are prefabricated in the front slats 2 and the rear slats 3 in the form of two sections. The prefabricated front slats 2 and the rear slats 3 are transported to the construction site, the front slats 2 and the rear slats 3 are placed in place, and then the aligned two sections of the longitudinal self-stressed tendons 7 are welded together. After the welding is completed, the transverse self-stressed tendons 8 are tied, and finally the high expansion concrete 9 is poured. After pouring and curing, the self-stressed seam structure suitable for connecting oblique slats of the utility model is formed.
Claims
1. A self-stressed joint structure suitable for connecting oblique slats, comprising a front slat (2), a rear slat (3), longitudinal self-stressed tendons (7) and transverse self-stressed tendons (8), the front slat and the rear slat are both parallelograms, and the front end of the front slat is mounted on a corbel (11) of a front wall (1) of a bridge; characterized in that: The rear end of the front slat is connected to the rear slat via a folded self-stressed seam (4), the folded self-stressed seam being composed of a middle seam (5) located in the middle and side seams (6) located at both ends of the middle seam, the middle seam being parallel to the transverse sides of the front slat and the rear slat, and the side seams being perpendicular to the longitudinal sides of the front slat and the rear slat; longitudinal self-stressed tendons and transverse self-stressed tendons are arranged in the folded self-stressed seam, the transverse self-stressed tendons are tied and fixed to the longitudinal self-stressed tendons, the two ends of the longitudinal self-stressed tendons are anchored in the front slat and the rear slat, respectively, and high expansion concrete (9) is poured in the folded self-stressed seam.
2. The self-stressed joint structure suitable for oblique lap joint connection according to claim 1, characterized in that: The longitudinal self-stressing tendons (7) in the middle seam (5) and the side seam (6) are respectively perpendicular to the length directions of the middle seam and the side seam, and the transverse self-stressing tendons in the middle seam and the side seam are both perpendicular to the longitudinal self-stressing tendons (7).
3. The self-stressed joint structure suitable for oblique lap joint connection according to claim 1 or 2, characterized in that: The width of the center seam (5) and the side seam (6) is 40 cm to 50 cm, the height is the same as that of the front slab (2) and the rear slab (3), and the length of the side seam is 80 cm to 150 cm.
4. The self-stressed joint structure suitable for oblique lap joint connection according to claim 1 or 2, characterized in that: The longitudinal self-stress generated by the folded self-stress joint (4) is 2MPa-4MPa, and the strength of the high expansion concrete (9) is 35MPa-45MPa.
5. The self-stressed joint structure suitable for oblique lap joint connection according to claim 1 or 2, characterized in that: The longitudinal self-stressing tendons (7) are double-row secondary steel bars with a diameter of 18 mm to 25 mm. The anchorage length of the longitudinal self-stressing tendons in the front and rear lap plates is not less than 30 times of their diameters. The transverse spacing of the longitudinal self-stressing tendons in the center seam (5) is 15 cm to 20 cm, and the transverse spacing of the longitudinal self-stressing tendons in the side seams (6) is 12 cm to 17 cm.
6. The self-stressed joint structure suitable for oblique lap joint connection according to claim 1 or 2, characterized in that: The transverse self-stressing tendons (8) are secondary steel bars with a diameter of 16 mm to 18 mm, and the transverse self-stressing tendons are arranged in two rows, four in total.