Bridge body box girder structure

Abstract

The utility model discloses a bridge body box girder structure which comprises a plurality of box girders connected in sequence, a support structure used for supporting the box girders on bridge piers, an anchoring device used for prestress tensioning of the box girders and a water seepage prevention device arranged on the box girders. The stay cable is fixedly connected with one end of a shockproof pull rope, and the other end of the shockproof pull rope is fixed on the box girder; the water seepage prevention device is provided with a first through hole allowing a beam end embedded pipe of a stay cable to penetrate through and a second through hole allowing a quakeproof pull rope to penetrate through. A first annular groove is formed in the first through hole, and an annular expansion water stop strip is arranged in the first annular groove; a second annular groove is formed in the second through hole, and an annular expansion water stop strip is also arranged in the second annular groove. The anti-seepage device is arranged, liquid water is prevented from flowing into the gap along the stay cable and the shockproof pull rope through the expansion water stop strips in the first through hole and the second through hole in the anti-seepage device, and then the situation that the anchoring position of the stay cable, the fixing position of the shockproof pull rope and other positions which are not easy to overhaul are rusted due to the liquid water is avoided.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a bridge box girder structure. Background Technology

[0002] A low-tower cable-stayed bridge is a bridge structure that combines the characteristics of continuous beam bridges and cable-stayed bridges. Its main features include lower towers, higher main girder stiffness, and concentrated stay cables. In this bridge system, the main girder, as the primary load-bearing component, exhibits significant stiffness, while the stay cables enhance the main girder's stiffness and adjust the stress distribution. Compared to continuous beam bridges, low-tower cable-stayed bridges demonstrate novel structural design, greater span capacity, ease of construction, and economic benefits; compared to traditional cable-stayed bridges, they have significant advantages in construction convenience, material conservation, and main girder stiffness. However, this structure also has some drawbacks. Because the specific heat capacity of the stay cable material is lower than that of water, the cable body cools down rapidly during cooling, causing water vapor in the air to easily condense into water droplets on the cable surface and flow downwards along the cable. Furthermore, rainwater also tends to flow downwards along the inclined cable body. This liquid water will eventually flow to the anchorage end of the cable and the connection between the damper and the bridge box girder, causing corrosion of the prestressing tendons and dampers in the cable, which will in turn have an adverse effect on the service life of the cable. Utility Model Content

[0003] This utility model provides a bridge box girder structure to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A bridge box girder structure includes: multiple box girders connected in sequence, a support structure for supporting the box girders on piers, an anchoring device for prestressing the box girders, and a seepage prevention device installed on the box girders; one end of a shock-absorbing rope is fixedly connected to a stay cable, and the other end of the shock-absorbing rope is fixed to the box girder; the seepage prevention device has a first through hole for the beam end embedded pipe of the stay cable to pass through and a second through hole for the shock-absorbing rope to pass through; a first annular groove is formed in the first through hole, and an annular expansion waterstop strip is provided in the first annular groove; a second annular groove is formed in the second through hole, and an annular expansion waterstop strip is also provided in the second annular groove.

[0006] Preferably, the waterproofing device includes: a first mounting block, a second mounting block, a third mounting block, and a locking structure; the second and third mounting blocks are located on one side of the first mounting block, and the second and third mounting blocks are arranged opposite each other, with each pair of the first, second, and third mounting blocks abutting against the upper surface of the box girder; the first through hole is divided into three parts by the first, second, and third mounting blocks, and the second through hole is divided into two parts by the second and third mounting blocks; the locking structure is used to fix the first, second, and third mounting blocks into one piece.

[0007] Preferably, the locking structure includes: a first bolt, a second bolt, a third bolt, and a fourth bolt; the first bolt is used to connect the first mounting block and the second mounting block, the second bolt is used to connect the first mounting block and the third mounting block from the side of the second mounting block and the third mounting block away from the box girder, and the fourth bolt is used to connect the second mounting block and the third mounting block from the side of the second mounting block and the third mounting block away from the first mounting block.

[0008] Preferably, the waterproofing device has a relief groove on the side facing the box girder, the relief groove is connected to the second through hole, and the relief groove is divided into two parts by the second mounting block and the third mounting block.

[0009] Preferably, the support structure includes: a support, a friction layer, and at least two anchor bolts; multiple first blind holes are provided on the pier, the lower end of the anchor bolt is inserted into the first blind hole and fixedly connected, and the anchor bolt corresponds to the first blind hole one by one; multiple second blind holes are provided on the lower surface of the support, the upper end of the anchor bolt is inserted into the second blind hole and a gap is left between it and the side wall of the second blind hole, and the anchor bolt corresponds to the second blind hole one by one; the friction layer is fixed on the upper surface of the support, and the friction layer is used to increase the friction force in contact with the box girder.

[0010] Preferably, the friction layer is made of a friction material.

[0011] Preferably, the anchoring device includes: a sheath, a restraint ring, and a corrugated pipe connected in sequence; the sheath contains a connector, a clamp, and a compression anchor; the connector abuts against the inner end face of the sheath away from the corrugated pipe; one end of the prestressing tendon of the first segment of the box girder of the bridge passes through the sheath and then through the connector, and is connected and fixed with the clamp; one end of the prestressing tendon of the second segment of the box girder of the bridge passes through the corrugated pipe, the restraint ring, and the corrugated pipe in sequence, then through the connector, and is connected and fixed with the compression anchor; a waterproof cloth is provided inside the restraint ring, and the waterproof cloth is twisted into a ball under the tension of the prestressing tendon of the second segment of the box girder of the bridge, thus sealing the inner hole of the restraint ring.

[0012] Preferably, the outer sleeve is provided with a support plate, the support plate is perpendicular to the center line of the sleeve and the two are fixedly connected; an elastic element is fixed on the side of the support plate away from the corrugated pipe, and the end of the elastic element away from the support plate abuts against the first segment box girder of the bridge; when the outer end face of the sleeve away from the corrugated pipe abuts against the first segment box girder of the bridge, the elastic force generated by the elastic element is less than the ultimate pressure of the first segment box girder under pressure failure.

[0013] Preferably, a protective pad is fixed to the outer end face of the sheath away from the corrugated pipe, and the protective pad serves as a buffer after the outer end face of the sheath away from the corrugated pipe abuts against the first segment box girder of the bridge.

[0014] Preferably, the elastic element includes multiple springs, which are evenly distributed around the axis of the support plate. One end of each spring is fixedly connected to the support plate, and the other end abuts against the box girder of the first segment of the bridge.

[0015] Beneficial effects:

[0016] The bridge box girder structure disclosed in this application is equipped with a seepage prevention device. The expansion water-stop strips in the first and second through holes of the seepage prevention device prevent liquid water from flowing into the gaps along the stay cables and shock-absorbing ropes, thereby avoiding corrosion of hard-to-maintain locations such as the anchoring positions of the stay cables and the fixing positions of the shock-absorbing ropes caused by liquid water. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of a bridge box girder structure disclosed in this invention;

[0019] Figure 2 This is a schematic diagram of the cable-stayed structure of a bridge box girder disclosed in this invention;

[0020] Figure 3 for Figure 2 Sectional view of section I;

[0021] Figure 4 This is a schematic diagram of a water-proofing device for a bridge box girder structure disclosed in this invention;

[0022] Figure 5 This is a top view of a water-proofing device for a bridge box girder structure disclosed in this invention;

[0023] Figure 6This is a schematic diagram of a bridge box girder support structure disclosed in this invention;

[0024] Figure 7 This is a cross-sectional view of a bridge box girder support structure disclosed in this invention;

[0025] Figure 8 This is a structural schematic diagram of a bridge box girder structure support and friction layer assembly disclosed in this invention;

[0026] Figure 9 This is a schematic diagram of a detachable prefabricated steel mold for a bridge box girder structure disclosed in this invention.

[0027] Figure 10 This is a schematic diagram of the installation position of an anchoring device for a bridge box girder structure disclosed in this invention;

[0028] Figure 11 This is a schematic diagram of the anchoring device for a bridge box girder structure and its construction method disclosed in this invention;

[0029] Figure 12 This is a schematic diagram of an assembly of a bridge box girder structure anchoring device, comprising a sheath, a constraint ring, a waterproof cloth, a support plate, an elastic element, and a protective pad.

[0030] 1. Box girder; 11. Prestressed tendons;

[0031] 21. Support; 22. Friction layer; 23. Anchor bolt; 24. Plastic cement; 251. Formwork; 252. Leak-proof strip; 253. Protective support plate; 254. Support rod; 255. Support block; 256. Supporting friction layer;

[0032] 311. Sheath; 312. Constraint ring; 313. Corrugated pipe; 321. Connector; 322. Clip; 323. Extrusion anchor; 33. Waterproof cloth; 34. Support plate; 35. Elastic element; 36. Protective pad;

[0033] 41. Tensioning nut; 42. Cable jack; 43. Tensioning rod; 44. Connecting sleeve; 45. Support leg; 451. Support leg protective shell; 452. Support leg end plate; 46. Beam end embedded pipe; 461. Embedded pipe pressure plate; 47. Cable body; 48. Buffer support seat; 49. Cable body waterproof cover; 410. Waterproof cover;

[0034] 51. First through hole; 52. Second through hole; 53. First mounting block; 54. Second mounting block; 55. Third mounting block; 561. First bolt; 562. Second bolt; 563. Third bolt; 564. Fourth bolt; 57. Relief groove;

[0035] 7. Bridge piers; 8. Seismic bracing ropes. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] Example 1

[0038] A bridge box girder structure and its construction method, combined with Figure 1 - Figure 12 As shown, it includes: multiple box girders 1 connected in sequence, a support structure for supporting the box girders 1 on the piers 7, an anchoring device for prestressing the box girders 1, and a seepage prevention device installed on the box girders 1; one end of the anti-seismic rope 8 is fixedly connected to the stay cable 4, and the other end of the anti-seismic rope 8 is fixed to the box girders 1; the seepage prevention device has a first through hole 51 for the beam end embedded pipe 46 of the stay cable 4 to pass through and a second through hole 52 for the anti-seismic rope 8 to pass through; a first annular groove is opened in the first through hole 51, and an annular expansion waterstop strip is provided in the first annular groove; a second annular groove is opened in the second through hole 52, and an annular expansion waterstop strip is also provided in the second annular groove. The expansion sealing strip in the first through hole 51 abuts against the inner wall of the first annular groove and fits tightly against the outer circumference of the pre-embedded pipe 46 at the beam end. When liquid water flows down along the pre-embedded pipe 46 at the beam end, the expansion sealing strip absorbs water and expands to achieve a seal, preventing the liquid water from continuing to flow downward to the anchoring position of the stay cable 4. The expansion sealing strip in the second through hole 52 abuts against the inner wall of the second annular groove and fits tightly against the outer circumference of the anti-vibration rope 8. When liquid water flows down along the anti-vibration rope 8, the expansion sealing strip absorbs water and expands to achieve a seal, preventing the liquid water from continuing to flow downward to the fixed position of the anti-vibration rope 8.

[0039] Specifically, the anchoring device includes: tension nut 41, cable jack 42, tension rod 43, connecting sleeve 44, support leg 45, beam end embedded pipe 46, and cable body 47. A buffer support seat 48 is also provided between the box girder 1 and the support leg 45. One side of the buffer support seat 48 abuts against the box girder 1, and the other side abuts against the support leg 45. The buffer support seat 48 is made of elastic material. The support leg 45 includes a cylindrical support leg protective shell 451 and an annular support leg end plate 452. The support leg end plate 452 is fixed to the support leg. The protective shell 451 has an open end; the buffer support 48 and the support end plate 452 are sleeved on the pre-embedded pipe 46 at the beam end. The inner diameter of the buffer support 48 and the support end plate 452 is the same as the outer diameter of the pre-embedded pipe 46 at the beam end. After the end of the pre-embedded pipe 46 at the beam end extends into the support foot 45, an annular pre-embedded pipe pressure plate 461 is fixed thereon. The pre-embedded pipe pressure plate 461 abuts against the surface of the support end plate 452 away from the buffer support 48. The outer diameter of the pre-embedded pipe pressure plate 461 is the same as the inner diameter of the protective shell 451 at the support foot. The pre-embedded pipe pressure plate 461 presses the support end plate 452, the support end plate 452 presses the buffer support 48, and the buffer support 48 abuts against the box girder 1. This allows the force borne by the support foot 45 and the pre-embedded pipe 46 at the beam end to be transmitted to the box girder 1 through the buffer support 48. The buffering effect of the buffer support 48 prevents the support foot 45 from directly contacting the box girder 1 and damaging it. Furthermore, the inner diameters of the buffer support 48 and the support foot end plate 452 are consistent with the outer diameter of the pre-embedded pipe 46 at the beam end, and the outer diameter of the pre-embedded pipe pressure plate 461 is consistent with the inner diameter of the support foot protective shell 451. This facilitates the positioning of the buffer support 48 and the support foot end plate 452, preventing the buffer support 48 and the support foot 45 from shifting and affecting the buffering effect of the buffer support 48. At the same time, the small size and ease of manufacture of the buffer support 48 also give it the advantage of low cost.

[0040] Preferably, the buffer support 48 is made of high-damping rubber material. High-damping rubber material has very high damping characteristics, which can absorb and dissipate mechanical energy and reduce the transmission of vibration and impact.

[0041] Preferably, the buffer support 48 is frustum-shaped, the diameter of the upper bottom surface of the buffer support 48 is consistent with the outer diameter of the support foot end plate 452, and the diameter of the lower bottom surface of the buffer support 48 is matched with the working surface of the box girder 1. The frustum-shaped shape can increase the contact area between the buffer support 48 and the box girder 1 and reduce pressure concentration.

[0042] Preferably, the end of the pre-embedded pipe 46 at the beam end, away from the support foot 45, extends out of the box girder 1 and is fitted with a cable-body waterproof cover 49. The end of the cable-body waterproof cover 49 away from the pre-embedded pipe 46 at the beam end is fitted with a waterproof cover 410. One end of the cable body 47 is connected to the connecting sleeve 44, and the other end passes through the pre-embedded pipe 46 at the beam end, the cable-body waterproof cover 49, and the waterproof cover 410 in sequence. The pre-embedded pipe 46 at the beam end, the cable-body waterproof cover 49, and the waterproof cover 410 form a protective structure to prevent rainwater and water vapor from directly contacting the cable body 47.

[0043] Preferably, one end of the shock-absorbing rope 8 passes through the waterproof cover 410 and is fixedly connected to the cable body 47, and the other end of the shock-absorbing rope 8 is fixed to the box girder 1. The shock-absorbing rope 8 prevents the cable body 47 from oscillating.

[0044] Specifically, a sensor is installed on the shock-absorbing rope 8, and the sensor's signal line is connected to the monitoring equipment. The sensor detects its own height, thereby indirectly detecting the operating status of the cable 47.

[0045] Specifically, multiple shock-absorbing ropes 8 are provided. The upper end of the shock-absorbing rope 8 is fixedly connected to the cable body 47 by bolts and buckles, and the lower end is fixedly connected to the box girder 1 by anchor bolts. The expansion water-stop strip in the second annular groove can prevent liquid water from flowing into the gap between the shock-absorbing rope 8 and the second through hole 52, thereby preventing liquid water from flowing onto the anchor bolts and causing them to rust, thus preventing the shock-absorbing rope 8 from loosening.

[0046] Preferably, the waterproofing device includes: a first mounting block 53, a second mounting block 54, a third mounting block 55, and a locking structure; the second mounting block 54 and the third mounting block 55 are located on one side of the first mounting block 53, and the second mounting block 54 and the third mounting block 55 are arranged opposite each other, with the first mounting block 53, the second mounting block 54, and the third mounting block 55 abutting against each other in pairs, and the first mounting block 53, the second mounting block 54, and the third mounting block 55 all abutting against the upper surface of the box girder 1; the first through hole 51 is divided into three parts by the first mounting block 53, the second mounting block 54, and the third mounting block 55, and the second through hole 52 is divided into two parts by the second mounting block 54 and the third mounting block 55; the locking structure is used to fix the first mounting block 53, the second mounting block 54, and the third mounting block 55 into one piece. If the first through hole 51 and the second through hole 52 are formed by merging two mounting blocks as usual, the large difference in diameter between the anti-vibration rope 8 and the pre-embedded pipe 46 at the beam end will prevent the expansion waterstop strips in the first and second annular grooves from being reliably compressed. For example, the expansion waterstop strip in the first annular groove may be compressed tightly around the outer circumference of the pre-embedded pipe 46 at the beam end, but due to errors, some parts of the expansion waterstop strip in the second annular groove may not be compressed and thus fail to fit the anti-vibration rope 8, leading to leakage. However, this problem can be solved by assembling the three mounting blocks in stages. Specifically, the second mounting block 54 and the third mounting block 55 are first spliced ​​together and locked. The two parts of the second through hole 52 on the second mounting block 54 and the third mounting block 55 clamp the expansion waterstop strip, allowing it to fit tightly against the outer circumference of the anti-vibration rope 8 and the inner wall of the second annular groove. Then, the first mounting block 53 is installed onto the assembly of the second mounting block 54 and the third mounting block 55 for splicing. By locking the first mounting block 53, the three parts of the first through hole 51 on the first mounting block 53, the second mounting block 54 and the third mounting block 55 press the expansion waterstop strip tightly, so that the expansion waterstop strip can be tightly attached to the outer periphery of the pre-embedded pipe 46 at the beam end and the inner wall of the first annular groove.

[0047] Specifically, waterproof sealant is applied between the bottom of the first mounting block 53, the second mounting block 54, and the third mounting block 55 and the upper surface of the box girder 1 to prevent liquid water from flowing onto the box girder 1 and seeping in through the gap between the waterproof device and the box girder 1.

[0048] Preferably, the locking structure includes: a first bolt 561, a second bolt 562, a third bolt 563, and a fourth bolt 564; the first bolt 561 is used to connect the first mounting block 53 and the second mounting block 54, the second bolt 562 is used to connect the first mounting block 53 and the third mounting block 55, the third bolt 563 is used to connect the second mounting block 54 and the third mounting block 55 from the side away from the box girder 1, and the fourth bolt 564 is used to connect the second mounting block 54 and the third mounting block 55 from the side away from the first mounting block 53.

[0049] Specifically, a first ear plate with a through hole is pre-embedded on the side of the first mounting block 53, and a second ear plate with a through hole is pre-embedded on the side of the second mounting block 54, with the first ear plate and the second ear plate facing each other; a third ear plate with a through hole is pre-embedded on the upper surface of the first mounting block 53, and a fourth ear plate with a through hole is pre-embedded on the upper surface of the second mounting block 54, with the third ear plate and the fourth ear plate facing each other; two sets of first bolts 561 pass through the first ear plate and the second ear plate, the third ear plate and the fourth ear plate respectively and are locked to realize the connection between the first mounting block 53 and the second mounting block 54.

[0050] A fifth ear plate with a through hole is pre-embedded on the other side of the first mounting block 53, and a sixth ear plate with a through hole is pre-embedded on the side of the third mounting block 55, with the fifth and sixth ear plates facing each other; a seventh ear plate with a through hole is pre-embedded on the upper surface of the first mounting block 53, and an eighth ear plate with a through hole is pre-embedded on the upper surface of the third mounting block 55, with the seventh and eighth ear plates facing each other; two sets of second bolts 562 pass through the fifth and sixth ear plates and the seventh and eighth ear plates respectively and are then locked to achieve the connection between the first mounting block 53 and the third mounting block 55.

[0051] The second mounting block 54 has a ninth ear plate with a through hole embedded on its side and upper surface away from the first mounting block 53, and the third mounting block 55 has a tenth ear plate with a through hole embedded on its side and upper surface away from the first mounting block 53. The ninth ear plate on the upper surface of the second mounting block 54 is opposite to the tenth ear plate on the upper surface of the third mounting block 55. The third bolt 563 passes through the corresponding ninth and tenth ear plates and locks them to connect the second mounting block 54 and the third mounting block 55. The ninth ear plate on the side of the second mounting block 54 away from the first mounting block 53 is opposite to the tenth ear plate on the side of the third mounting block 55 away from the first mounting block 53. The fourth bolt 564 passes through the corresponding ninth and tenth ear plates and locks them to connect the second mounting block 54 and the third mounting block 55. The third bolt 563 and the fourth bolt 564 cooperate to achieve a reliable connection between the second mounting block 54 and the third mounting block 55.

[0052] Preferably, the waterproofing device has a relief groove 57 on the side facing the box girder 1. The relief groove 57 is connected to the second through hole 52 and is divided into two parts by the second mounting block 54 and the third mounting block 55. The relief groove 57 is used to accommodate the anchor bolts at the lower end of the shock-absorbing rope 8.

[0053] Preferably, the support structure includes: a support 21, a friction layer 22, and at least two anchor bolts 23; multiple first blind holes are provided on the pier 7, and the lower end of the anchor bolt 23 is inserted into the first blind hole and fixedly connected, with each anchor bolt 23 corresponding to one of the first blind holes; multiple second blind holes are provided on the lower surface of the support 21, and the upper end of the anchor bolt 23 is inserted into the second blind hole with a gap between it and the side wall of the second blind hole, with each anchor bolt 23 corresponding to one of the second blind holes; the friction layer 22 is fixed on the upper surface of the support 21, and the friction layer 22 is used to increase the friction force in contact with the box girder 1. By setting the anchor bolts 23 to install the support 21, and by setting the friction layer 22 on the support 21 to increase the friction force in contact with the box girder 1, the adaptability to stress changes during bridge operation and the adaptability to deformation of the box girder 1 and the pier 7 of the bridge are enhanced, ensuring that the support 21 reliably supports the box girder 1 without relative sliding, and ensuring a reliable connection between the superstructure and substructure of the bridge.

[0054] Preferably, the upper surface of the friction layer 22 is wavy and / or serrated to increase the friction coefficient of the friction layer 22.

[0055] Preferably, the friction layer 22 is made of a friction material, which can significantly increase the friction between the friction layer 22 and the box girder 1.

[0056] Preferably, the friction layer 22 is bonded and fixed to the support 21.

[0057] Preferably, plastic cement 24 is filled between the lower end of the anchor bolt 23 and the first blind hole, and between the upper surface of the pier 7 and the lower surface of the support 21, and the plastic cement 24 fixes the lower end of the anchor bolt 23 to the first blind hole.

[0058] Specifically, when pouring the plastic cement 24, it is ensured that it does not enter the gap between the upper end of the anchor bolt 23 and the side wall of the second blind hole. Because the volume difference between the support 21 and the pier 7 is significant, the expansion of the pier 7 and the anchor bolt 23 after temperature rise can easily damage the support 21, causing it to fail to reliably connect the bridge superstructure and substructure. The gap between the upper end of the anchor bolt 23 and the side wall of the second blind hole can compensate for the expansion of the pier 7 and the anchor bolt 23, preventing damage to the support 21.

[0059] Preferably, the plastic cement 24 is poured using a detachable precast steel mold. The detachable precast steel mold includes multiple templates 251 and corresponding protective support components. The multiple templates 251 are sequentially spliced ​​and arranged around the support 21, with the protective support components supporting the corresponding templates 251. Grouting is performed into the space enclosed by the multiple templates 251, gradually filling the upper surface of the pier 7. The plastic cement 24 then gradually flows between the first blind hole and the lower end of the anchor bolt 23, as well as between the lower surface of the support 21 and the upper surface of the pier 7. After the plastic cement 24 solidifies, it secures the anchor bolt 23 to the pier 7 and the support 21 to the pier 7.

[0060] Preferably, a leak-proof strip 252 is also provided between the template 251 and the pier 7 to prevent grout from flowing out.

[0061] Preferably, the protective support assembly includes: a protective support plate 253, a support rod 254, a support block 255, and a support friction layer 256; the protective support plate 253 is disposed on the upper surface of the pier 7 and located on the side of the template 251 away from the support 21, and the protective support plate 253 abuts against the template 251; the support block 255 is disposed on the upper surface of the pier 7 and located on the side of the protective support plate 253 away from the support 21, the support friction layer 256 is located between the support block 255 and the pier 7, and the support friction layer 256 is fixedly connected to the support block 255; one end of the support rod 254 is fixedly connected to the protective support plate 253, and the other end is fixedly connected to the support block 255.

[0062] Preferably, the anchoring device includes: a sheath 311, a restraint ring 312, and a corrugated pipe 313 connected in sequence. The sheath 311 is provided with a connector 321, a clamp 322, and a compression anchor 323. The connector 321 abuts against the inner end face of the sheath 311 away from the corrugated pipe 313. One end of the prestressing tendon of the first segment of the box girder 1 of the bridge passes through the sheath 311 and then through the connector 321, and is connected and fixed with the clamp 322. One end of the prestressing tendon of the second segment of the box girder 1 of the bridge passes through the corrugated pipe 313, the restraint ring 312, and the corrugated pipe 313 in sequence, and then through the connector 321, and is connected and fixed with the compression anchor 323. A waterproof cloth 33 is provided inside the restraint ring 312. Under the tension of the prestressing tendon of the second segment of the box girder 1 of the bridge, the waterproof cloth 33 twists into a ball and blocks the inner hole of the restraint ring 312. During the tensioning process of the prestressing tendon 11, the twisting and stretching cause the waterproof cloth 33 to twist into a ball, and the waterproof cloth 33 can tightly press against the inner wall of the constraint ring 312, thereby blocking the inner hole of the constraint ring 312. This prevents water vapor and rainwater from entering through the corrugated pipe 313, which would cause corrosion of the prestressing tendon 11, connector 321, wedge 322 and extrusion anchor 323. This maintains the quality of the project and extends the service life of the anchoring device.

[0063] Specifically, one end of the constraint ring 312 is fitted onto the sheath 311 and the other end is fitted onto the bellows 313. The constraint ring 312 tightens the sheath 311 and the bellows 313 to connect the sheath 311 and the bellows 313, thereby achieving a seal at the connection between the sheath 311, the constraint ring 312 and the bellows 313.

[0064] Specifically, the middle part of the constraint ring 312 is a conical part, with the small end of the conical part facing the corrugated pipe 313. Under the tension of the prestressed tendon 11, the waterproof cloth 33 can plug the small end of the conical part, further enhancing the sealing effect.

[0065] Preferably, a support plate 34 is provided over the sheath 311, the support plate 34 is perpendicular to the centerline of the sheath 311 and the two are fixedly connected; an elastic element 35 is fixedly provided on the side of the support plate 34 away from the corrugated pipe 313, and the end of the elastic element 35 away from the support plate 34 abuts against the first segment box girder 1 of the bridge; when the outer end face of the sheath 311 away from the corrugated pipe 313 abuts against the first segment box girder 1 of the bridge, the elastic force generated by the elastic element 35 is less than the ultimate pressure of the first segment box girder 1 under pressure failure. When tensioning is required, the support plate 34 is pressed against the working surface of the tensioning tool used for tensioning the prestressing tendons 11, and the jack of the tensioning tool applies tension to the prestressing tendons 11. The anchoring device moves slowly towards the box girder 1, and the elastic deformation of the elastic element 35 provides buffering to prevent the box girder 1 from under pressure failure.

[0066] Preferably, the elastic element 35 includes multiple springs, which are evenly distributed around the axis of the support plate 34. One end of each spring is fixedly connected to the support plate 34, and the other end abuts against the box girder 1 of the first segment of the bridge. Using multiple springs increases the contact area with the box girder 1, which is beneficial for achieving a better cushioning effect. Furthermore, using multiple springs results in lower manufacturing and maintenance costs compared to using a single elastic element.

[0067] Preferably, a protective pad 36 is fixedly provided on the outer end face of the sheath 311 away from the corrugated pipe 313. The protective pad 36 serves to buffer the outer end face of the sheath 311 away from the corrugated pipe 313 after it abuts against the first segment box girder 1 of the bridge. When the spring is compressed to a certain extent and the protective pad 36 abuts against the box girder 1, the buffering effect of the protective pad 36 prevents the spring from being further compressed and generating excessive elastic force that could damage the box girder 1.

[0068] Preferably, the protective pad 36 is made of high-damping rubber material and is bonded to the end face of the sheath 311.

[0069] Preferably, the sheath 311 is made of stainless steel, the support plate 34 is made of stainless steel, the support plate 34 is fixed to the outer periphery of the sheath 311 by welding, and the spring is fixed to the support plate 34 by welding.

[0070] Example 2

[0071] This embodiment provides a construction method for a bridge box girder structure, including the following steps:

[0072] S1. Construct supports on the bridge piers;

[0073] S11. Construct the first blind hole on the pier and the second blind hole on the support;

[0074] S12. After inserting the lower end of the anchor bolt into the first blind hole, the support is hoisted so that the upper end of the anchor bolt is inserted into the second blind hole.

[0075] S13. Apply a friction layer above the support;

[0076] S14. Install leak-proof strips and templates around the support;

[0077] S15. After pasting the support friction layer on the lower surface of the support block, install it on the upper surface of the pier. Then, erect the protective support plate on the outside of the anti-leakage strip and the template for support. Next, connect the support rod to the protective support plate. Finally, after adjusting the position of the support block, connect the support rod to the support block.

[0078] S2. Hoist the box girder onto the supports of the two adjacent piers;

[0079] S3. Install anchoring devices on the box girder;

[0080] S31. Weld the connector and support plate onto the sheath;

[0081] S32. After passing the prestressing tendons of the first segment of the box girder through the sheath and the connector, connect them to the wedges. After passing the prestressing tendons of the second segment of the box girder through the sheath and the connector, connect them to the extrusion anchor.

[0082] S33. Place a waterproof cloth inside the constraint ring, pass the prestressed tendons of the second segment of the box girder through the constraint ring and the waterproof cloth, and then insert them into the corrugated pipe. Insert the corrugated pipe and the sheath from both ends of the constraint ring, apply pressure to the constraint ring to connect and seal it.

[0083] S34. Weld elastic elements onto the support plate;

[0084] S35. A protective pad layer is bonded to the end of the sheath;

[0085] S4. Prestressing is performed on the prestressed tendons in the box girder using jacks and anchoring devices.

[0086] S41. Place the elastic element against the box girder, install the tensioning tool and place the support plate against the working surface of the tensioning tool. The jack of the tensioning tool applies tension to the prestressed tendons, causing the prestressed tendons to stretch and twist, which causes the waterproof cloth to twist into a ball and block the inner hole of the constraint ring.

[0087] S42. After tensioning is completed, remove the tensioning tools;

[0088] S5. Install stay cables and shock-absorbing ropes on the box girder;

[0089] S51. When embedding the pre-embedded pipe at the beam end, the support foot and buffer support seat shall be sleeved on the pre-embedded pipe at the beam end and pressed and fixed on the box girder.

[0090] S52. Install the cable body waterproof cover, waterproof cover, cable body, connecting sleeve, tension rod, cable jack and tension nut in sequence;

[0091] S53, cable-stayed structure;

[0092] S6. Install waterproofing devices on the box girder;

[0093] S61. Insert a semi-circular expansion waterstop strip into half of the second annular groove of each of the second and third mounting blocks, assemble the second and third mounting blocks, and lock them so that the expansion waterstop strip presses against the perimeter of the shock-absorbing pull rope.

[0094] S62. Insert semi-circular expansion waterstop strips into half of the first annular groove of the first mounting block and half of the first annular groove formed by the second and third mounting blocks. Assemble the combination of the first mounting block, the second mounting block and the third mounting block, and lock it so that the expansion waterstop strips press against the perimeter of the pre-embedded pipe at the beam end.

[0095] S63. Apply waterproof sealant to the underside and around the first mounting block, the second mounting block, and the third mounting block.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A bridge box girder structure, characterized by, The utility model relates to a kind of water seepage prevention device for box girder, including: Multiple sequentially connected box girders (1), support structure for supporting the box girder (1) on pier (7), anchoring device for prestressed tension of the box girder (1) and water seepage prevention device arranged on the box girder (1);One end of shock-absorbing rope (8) is fixedly connected on cable-stayed cable (4), and the other end of the shock-absorbing rope (8) is fixed on the box girder (1);First through-hole (51) for the beam end embedded pipe (46) of cable-stayed cable (4) to pass through and second through-hole (52) for the shock-absorbing rope (8) to pass through are opened in the water seepage prevention device;First annular groove is opened in the first through-hole (51), and annular expansion waterstop is arranged in the first annular groove;Second annular groove is opened in the second through-hole (52), and annular expansion waterstop is also arranged in the second annular groove.

2. A box girder bridge structure according to claim 1, wherein The water seepage prevention device includes: first mounting block (53), second mounting block (54), third mounting block (55) and locking structure;Second mounting block (54) and third mounting block (55) are located on one side of the first mounting block (53), and the second mounting block (54) and the third mounting block (55) are oppositely arranged, the first mounting block (53), the second mounting block (54) and the third mounting block (55) are mutually abutted in pairs, and the first mounting block (53), the second mounting block (54) and the third mounting block (55) are abutted on the upper surface of the box girder (1);The first through-hole (51) is divided into three parts by the first mounting block (53), the second mounting block (54) and the third mounting block (55), and the second through-hole (52) is divided into two parts by the second mounting block (54) and the third mounting block (55);The locking structure is used to fix the first mounting block (53), the second mounting block (54) and the third mounting block (55) as a whole.

3. A box girder bridge structure according to claim 2, wherein The locking structure includes: first bolt (561), second bolt (562), third bolt (563) and fourth bolt (564);The first bolt (561) is used to connect the first mounting block (53) and the second mounting block (54), the second bolt (562) is used to connect the first mounting block (53) and the third mounting block (55), the third bolt (563) is used to connect the second mounting block (54) and the third mounting block (55) from the side of the second mounting block (54) and the third mounting block (55) away from the box girder (1), and the fourth bolt (564) is used to connect the second mounting block (54) and the third mounting block (55) from the side of the second mounting block (54) and the third mounting block (55) away from the first mounting block (53).

4. The structure of claim 3, wherein The side of the water seepage prevention device towards the box girder (1) is provided with a let-out slot (57), the let-out slot (57) is communicated with the second through-hole (52), and the let-out slot (57) is divided into two parts by the second mounting block (54) and the third mounting block (55).

5. The structure of claim 1, wherein The support structure comprises a support (21), a friction layer (22) and at least two anchors (23); a plurality of first blind holes are formed in the pier (7), the lower ends of the anchors (23) are inserted into the first blind holes and fixedly connected, and the anchors (23) correspond to the first blind holes one by one; a plurality of second blind holes are formed in the lower surface of the support (21), the upper ends of the anchors (23) are inserted into the second blind holes and leave a gap with the side walls of the second blind holes, and the anchors (23) correspond to the second blind holes one by one; the friction layer (22) is fixedly arranged on the upper surface of the support (21), and the friction layer (22) is used for increasing the friction force in contact with the box girder (1).

6. A box girder bridge structure according to claim 5, wherein The friction layer (22) is made of friction material.

7. The structure of claim 1, wherein The anchoring device comprises a sheath (311), a constraint ring (312) and a bellows (313) connected in sequence, a connecting body (321), a clamping piece (322) and an extrusion anchor (323) are arranged in the sheath (311), the connecting body (321) abuts against the inner end face of the sheath (311) away from the bellows (313); one end of the prestressed tendon of the box girder (1) of the first segment of the bridge passes through the sheath (311), then passes into the connecting body (321) and is connected and fixed with the clamping piece (322), one end of the prestressed tendon of the box girder (1) of the second segment of the bridge passes through the bellows (313), the constraint ring (312) and the bellows (313) in sequence, then passes through the connecting body (321) and is connected and fixed with the extrusion anchor (323); a waterproof cloth (33) is arranged in the constraint ring (312), and the waterproof cloth (33) is twisted into a bundle under the tension of the prestressed tendon of the box girder (1) of the second segment of the bridge and seals the inner hole of the constraint ring (312).

8. The structure of claim 7, wherein A support disc (34) is arranged on the sheath (311), the support disc (34) is perpendicular to the center line of the sheath (311) and fixedly connected with the sheath (311); an elastic member (35) is fixedly arranged on the side of the support disc (34) away from the bellows (313), one end of the elastic member (35) away from the support disc (34) abuts against the box girder (1) of the first segment of the bridge; when the outer end face of the sheath (311) away from the bellows (313) abuts against the box girder (1) of the first segment of the bridge, the elastic force generated by the elastic member (35) is smaller than the limit pressure of the pressure type damage of the box girder (1) of the first segment.

9. The structure of claim 8, wherein A protective cushion layer (36) is fixedly arranged on the outer end face of the sheath (311) away from the bellows (313), and the protective cushion layer (36) is used for buffering after the outer end face of the sheath (311) away from the bellows (313) abuts against the box girder (1) of the first segment of the bridge.

10. The structure of claim 8, wherein The elastic member (35) comprises a plurality of springs, the plurality of springs are circumferentially distributed around the axis of the support disc (34), one end of the spring is fixedly connected with the support disc (34), and the other end of the spring abuts against the box girder (1) of the first segment of the bridge.

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