Bridge anchoring supporting system suitable for narrow space and construction method

Abstract

The invention relates to the field of suspension bridge anchorage construction and construction, and discloses a bridge anchoring supporting system suitable for a narrow space and a construction method.The supporting system comprises an anchor body permanent structure used for being cooperatively stressed with a temporary support system in the construction process and finally forming a permanent bearing structure of a bridge; the distribution beam and template system is used for directly supporting and limiting the shape and the size of the cast-in-place concrete; the support and connecting system is used for supporting the pouring load of the splay cable saddle buttress; and the horizontal connecting device is used for transmitting a horizontal load. The splay cable saddle buttress and the rear anchor block are supported through the first support, the second support and the third support, the first support and the third support are split, the supports and a connecting system can be split, the situation that two sets of independent and large-size support systems are used for supporting the splay cable saddle buttress and the rear anchor block is avoided, the support system is simplified, and the cost is reduced. And therefore, the mounting, debugging and dismounting periods are shortened, the manual and mechanical investment is reduced, and the construction period is shortened.

Description

Technical Field

[0001] The present invention relates to the field of suspension bridge anchorage construction, and in particular to a bridge anchoring support system and a construction method suitable for narrow spaces. Background Art

[0002] During the construction of loose cable saddles and anchor blocks for suspension bridge anchorages, the industry generally uses a system of cast-in-place supports for the loose cable saddles and the front anchor chamber to withstand the axial loads caused by concrete pouring. The traditional dual-support arrangement is costly in terms of material and construction time, and is prone to interference. The installation and removal of two independent supports is particularly challenging in confined spaces.

[0003] For pouring concrete at steep angles, the column layout angle should align with the combined horizontal and vertical loads, minimizing the significant bending moment at the base of the steel pipe columns caused by the tangential component. Limited space within the anchor blocks prevents the columns from being arranged in the direction of the combined loads. Traditional approaches involve increasing the size of the steel pipes or pouring concrete within a limited area at the base of the steel pipe piers. This results in a complex support system that is difficult to dismantle and wastes additional materials. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a bridge anchor support system and construction method suitable for narrow spaces, which solves the problem that the traditional practice is to increase the size of steel pipes or pour concrete within a certain range at the bottom of the steel pipe pier, thereby resulting in a complex support system structure that is difficult to dismantle and also leads to extra material waste.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a bridge anchor support system suitable for use in narrow spaces, comprising: a permanent anchor structure, which is used to cooperate with a temporary support system to bear force during construction and ultimately form a permanent load-bearing structure of the bridge; Distribution beams and formwork systems, used to directly support and define the shape and size of cast-in-place concrete; The bracket and connection system includes a bracket 1 for supporting the pouring load of the loose cable saddle pier, and a bracket 3 for supporting the pouring load of the front anchor chamber, wherein the bracket 1 and the bracket 3 are connected; The horizontal connection device is used to horizontally connect the support and connection system with the cast rear anchor block to transfer horizontal loads and allow the support system to generate vertical relative displacement at the connection point.

[0006] Preferably, the permanent structure of the anchor body includes a concrete caisson, the top surface of the concrete caisson is provided with a caisson top plate, the top surface of the caisson top plate is provided with a loose cable saddle pier, one side of the loose cable saddle pier is connected to a rear anchor block, the rear anchor block is provided with a rear anchor chamber, a rear anchor surface and a front anchor surface, the rear anchor block is provided with a front anchor chamber on the side close to the loose cable saddle pier, the front anchor chamber is provided with a front anchor chamber top plate, a front anchor chamber side plate, a front anchor chamber front plate and a front anchor chamber bottom plate, the top of the loose cable saddle pier is installed with a loose cable saddle, the middle of the loose cable saddle is provided with a main cable, the main cable passes through the front anchor chamber and is connected to the rear anchor block, and the end of the main cable is inside the rear anchor chamber, and a post-cast section is provided between the bottom of the loose cable saddle pier and the rear anchor block.

[0007] Preferably, the distribution beam and formwork system includes a longitudinal beam and a transverse beam, one side of the longitudinal beam is connected to the transverse beam, and the other side is connected to the longitudinal beam embedded part, the outside of the longitudinal beam is alternately provided with small distribution beams and double-jointed small distribution beams, and the outer walls of the small distribution beams and double-jointed small distribution beams are provided with square timber and bamboo plywood, the inside of the longitudinal beam is provided with a stiffening plate, and the square timber is in contact with the loose cable saddle pier, and the stiffening plate is in contact with one side of the rear anchor block.

[0008] Preferably, in the bracket and connection system, the bottom of the bracket one is installed with a column foot embedded part for connecting the loose cable saddle pier, and one side of the bracket one is installed with a bracket two for connecting the rear anchor block. The top of the bracket one is connected to the bracket three by temporary anchoring, and the two sides of the outer wall of the bracket three are respectively in contact with the adjacent sides of the two sides of the inner wall of the longitudinal beam.

[0009] Preferably, the bracket three includes a steel pipe column and a reinforcing rod, the reinforcing rod is located in the middle of the steel pipe column, the middle of the steel pipe column is connected to a pile cap, the bottom of the steel pipe column is fixedly connected with a flat joint, and the steel pipe column and the reinforcing rod are connected with an oblique joint, and the middle of both sides of the steel pipe column are installed with pile head weldments, and the pile head weldments on both sides are respectively in contact with the adjacent sides of the inner wall of the longitudinal beam.

[0010] Preferably, the horizontal connecting device includes a horizontal steel pipe and an embedded device part, one side of the horizontal steel pipe is fixedly connected to a plate, one side of the plate is provided with a sliding round steel, the bottom of the sliding round steel is provided with a limiting plate, and the limiting plate is fixedly connected to the plate, the embedded device part includes an embedded plate and an anchor bar, one side of the anchor bar is connected to the rear anchor block, and the other side is fixedly connected to the embedded plate, one side of the sliding round steel is in contact with one side of the embedded plate, and the other side of the horizontal steel pipe is connected to bracket two.

[0011] Preferably, the temporary anchoring uses a temporary consolidation device, which includes a unloading block, and the top and bottom of the unloading block are respectively provided with an upper cover plate and a lower cover plate, and a vertical support plate is provided between the upper cover plate and the lower cover plate, the upper cover plate is connected to the bracket three-phase, and the lower cover plate is connected to the bracket one-phase.

[0012] A construction method for a bridge anchor support system suitable for use in a narrow space comprises the following steps: Step 1: Pour the concrete caisson and embed the column embedded parts of the bracket 2, then pour the caisson top plate and pour the No. 0 segment of the rear anchor block; Step 2: Embed the column foot embedded parts and longitudinal beam embedded parts of bracket 1, then cast segment 0 of the loose cable saddle pier, then embed the installation embedded parts of the horizontal connection device corresponding to bracket 1, and then further cast segments 1-2 of the rear anchor block; Step 3: Erect the main body of the support and lay the distribution beam and formwork system; Step 4: Embed the embedded parts of the horizontal connection device corresponding to the embedded bracket 1. After completion, cast the No. 3 segment of the rear anchor block and simultaneously construct the No. 1 segment of the cable saddle pier; Step 5: Continue to embed the embedded parts of the horizontal connection device corresponding to the bracket 1, and cyclically construct the No. 4-5 segments of the rear anchor block and the No. 2-3 segments of the loose cable saddle pier. Then, remove the mold of the No. 2-3 segments of the rear anchor block, and then reinstall the horizontal connection device corresponding to the bracket 1 at the removed position. Step 6: After constructing the No. 6-7 segment of the rear anchor block, install the corresponding horizontal connection device of the bracket and construct the No. 4-5 segment of the cable saddle pier; Step 7: After pouring the No. 8 segment of the rear anchor block, set up support 2 and install the diagonal connection between support 2 and support 1, then install the temporary consolidation device on top of support 1, and set up support 3 to further complete the construction of No. 6 segment of the pier; Step 8: Multi-structure three-dimensional construction: Simultaneously construct segments 9-10 of the rear anchor block, segments 7-13 of the loose cable saddle buttress, and segments 1-6 of the front anchor chamber. Segments 1-6 of the front anchor chamber must be advanced 1 segment later than the loose cable saddle buttress, and pre-embedded loose cable saddle brackets in segment 6. Step 9: After the front anchor chamber is poured, remove the unloading block and dismantle bracket three, bracket one and bracket two in turn, further close the rear anchor block and the post-cast section between the loose cable saddle pier, further set up the loose cable saddle bracket, and prepare to install the loose cable saddle.

[0013] The present invention provides a bridge anchor support system and construction method suitable for narrow spaces. It has the following beneficial effects: 1. The present invention supports the loose cable saddle pier and the rear anchor block by using brackets 1, 2 and 3, and by splitting brackets 1 and 3, the brackets and the connection system can be split, thereby avoiding the use of two independent, large-volume bracket systems to support the loose cable saddle pier and the rear anchor block, thereby simplifying the bracket system, greatly shortening the installation, commissioning and dismantling cycle, reducing the investment in manpower and machinery, and shortening the construction period.

[0014] 2. The present invention implements segmented cross-casting construction, that is, the rear anchor block precedes the loose cable saddle pier, and the loose cable saddle pier precedes the construction progress of the front anchor chamber bottom plate. The rear anchor block that has been cast and reached the design strength can be used to support and resist the horizontal load generated by the subsequent casting body. Therefore, the bearing pressure of the temporary support itself can be greatly reduced, and the ultimate requirement for the support strength is reduced, thereby improving the safety redundancy and stability of the entire construction process.

[0015] 3. The present invention divides the bracket and the connection system into bracket one, bracket two and bracket three, and uses a temporary consolidation device to connect bracket one and bracket three. After the pouring is completed, bracket one and bracket three can be disassembled by removing the temporary consolidation device, thereby achieving the purpose of step-by-step unloading and dismantling, and solving the problem of dismantling traditional large integral brackets in a small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a permanent structural layout diagram of the anchor body of the present invention; Figure 2 This is a layout diagram of the distribution beam and formwork system of the present invention; Figure 3 This is a layout diagram of the cast-in-place bracket for the loose cable saddle buttress and the front anchor chamber bottom plate of the present invention; Figure 4 This is a structural diagram of the horizontal connection device of the present invention; Figure 5 This is a structural diagram of the temporary consolidation device of the present invention; Figure 6 Schematic diagram of step 1 in the construction sequence of the cable saddle buttress and the front anchor chamber bottom plate of the present invention; Figure 7 Schematic diagram of step 2 in the construction sequence of the cable saddle pier and the front anchor chamber bottom plate of the present invention Figure 8 Schematic diagram of step 3 in the construction sequence of the cable saddle pier and the front anchor chamber bottom plate of the present invention Figure 9 Schematic diagram of step 4 in the construction sequence of the cable saddle pier and the front anchor chamber bottom plate of the present invention Figure 10 Schematic diagram of step 5 in the construction sequence of the cable saddle pier and the front anchor chamber bottom plate of the present invention Figure 11 Schematic diagram of step 6 in the construction sequence of the cable saddle pier and the front anchor chamber bottom plate of the present invention Figure 12 Schematic diagram of step 7 in the construction sequence of the cable saddle pier and the front anchor chamber bottom plate of the present invention Figure 13 Schematic diagram of step 8 in the construction sequence of the cable saddle pier and the front anchor chamber bottom plate of the present invention Figure 14 It is a schematic diagram of step 9 in the construction sequence of the cable saddle buttress and the front anchor chamber bottom plate of the present invention.

[0017] Among them, 1. Permanent structure of anchor body; 11. Concrete caisson; 12. Caisson top plate; 13. Loose cable saddle pier; 14. Rear anchor block; 141. Rear anchor chamber; 142. Rear anchor surface; 143. Front anchor surface; 15. Front anchor chamber; 151. Front anchor chamber top plate; 152. Front anchor chamber side plate; 153. Front anchor chamber front plate; 154. Front anchor chamber bottom plate; 16. Main cable; 17. Loose cable saddle; 18. Post-cast section; 2. Distribution beam and formwork system; 21. Longitudinal beam; 22. Horizontal beam; 23. Small distribution beam; 24. Double-jointed small distribution beam; 25. Square timber; 26. Bamboo plywood; 27. Stiffening plate; 28. Longitudinal beam Embedded parts; 3. Brackets and connection systems; 31. Bracket one; 32. Bracket two; 33. Bracket three; 331. Steel pipe column; 332. Flat joint; 333. Oblique joint; 334. Reinforcement rod; 335. Pile cap; 336. Pile head assembly weldment; 34. Temporary anchor; 35. Column foot embedded parts; 4. Horizontal connection device; 41. Horizontal steel pipe; 42. Sticking plate; 43. Sliding round steel; 44. Limiting plate; 45. Device embedded parts; 451. Embedded plate; 452. Anchor bar; 5. Temporary consolidation device; 51. Unloading block; 52. Upper cover plate; 53. Lower cover plate; 54. Vertical support plate. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the specification of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] In order to better understand the present invention, the above contents are described in detail below in conjunction with specific embodiments.

[0020] Please see the attached Figure 1 -Attached Figure 5An embodiment of the present invention provides a bridge anchoring support system suitable for a narrow space, comprising: an anchor body permanent structure 1, used to cooperate with a temporary support system to bear force during construction, and ultimately constitute a permanent load-bearing structure of the bridge; a distribution beam and formwork system 2, used to directly support and limit the shape and size of cast-in-place concrete; a support and connection system 3, which includes a support 1 31 for supporting the casting load of a cable saddle pier 13, and also includes a support 3 33 for supporting the casting load of a front anchor chamber 15, and the support 1 31 and the support 3 33 are connected to each other; a horizontal connection device 4, used to horizontally connect the support and connection system 3 with the cast rear anchor block 14, to transfer horizontal loads, and to allow the support system to generate vertical relative displacement at the connection.

[0021] In this embodiment, the permanent anchor structure 1 serves as the permanent load-bearing structure that ultimately constitutes the bridge. It can cooperate with the temporary support system to bear force during the construction process, thereby improving the stability of the support and connection system 3. The support and connection system 3 can be used to support the distribution beam and formwork system 2, and then concrete can be poured on the outside of the distribution beam and formwork system 2 to form a rear anchor block 14 and a cable saddle pier 13.

[0022] The anchor body permanent structure 1 includes a concrete caisson 11, a caisson top plate 12 is provided on the top surface of the concrete caisson 11, a saddle pier 13 is provided on the top surface of the caisson top plate 12, a rear anchor block 14 is connected to one side of the saddle pier 13, a rear anchor chamber 141, a rear anchor surface 142 and a front anchor surface 143 are provided inside the rear anchor block 14, a front anchor chamber 15 is provided on the side of the rear anchor block 14 close to the saddle pier 13, and the interior of the front anchor chamber 15 is provided with a rear anchor chamber 141, a rear anchor surface 142 and a front anchor surface 143. A front anchor chamber top plate 151, a front anchor chamber side plate 152, a front anchor chamber front plate 153 and a front anchor chamber bottom plate 154 are provided. A loose cable saddle 17 is installed on the top of the loose cable saddle pier 13. A main cable 16 is provided in the middle of the loose cable saddle 17. The main cable 16 passes through the front anchor chamber 15 and is connected to the rear anchor block 14. The end of the main cable 16 is inside the rear anchor chamber 141. A post-cast section 18 is provided between the bottom of the loose cable saddle pier 13 and the rear anchor block 14.

[0023] In this embodiment, the cable saddle pier 13 can support the cable saddle 17 located on its top, and transmit the vertical pressure transmitted by the main cable 16 to the foundation below, that is, the permanent structure of the anchor body, and the rear anchor block 14 is in contact with the cable saddle pier 13, and the deadweight and volume of the rear anchor block 14 are used to provide a stable anchor point for the bridge. The interior of the rear anchor block 14 is provided with a rear anchor chamber 141, a rear anchor surface 142 and a front anchor 143 for installing the main cable 16, and the front anchor chamber 15 is a space surrounded by a front anchor chamber top plate 151, a side plate 152, a front plate 153 and a bottom plate 154, which can provide space for the main cable 16 to travel from the cable saddle 17 to the rear anchor block 14; finally, a post-casting section 18 is provided at the bottom of the cable saddle pier 13 and the rear anchor block 14, and concrete can be poured after the main structure construction is completed, and finally the cable saddle pier 13 and the rear anchor block 14 are connected into a whole, thereby improving the strength of the structure.

[0024] The distribution beam and formwork system 2 includes a longitudinal beam 21 and a transverse beam 22. One side of the longitudinal beam 21 is connected to the transverse beam 22, and the other side is connected to the longitudinal beam embedded part 28. Small distribution beams 23 and double-spliced ​​small distribution beams 24 are alternately arranged on the outside of the longitudinal beam 21, and the outer walls of the small distribution beams 23 and the double-spliced ​​small distribution beams 24 are provided with square timbers 25 and bamboo plywood 26. A stiffening plate 27 is provided inside the longitudinal beam 21, and the square timber 25 is in contact with the loose cable saddle pier 13, and the stiffening plate 27 is in contact with one side of the rear anchor block 14.

[0025] In this embodiment, by alternately arranging small distribution beams 23 and double-pieced small distribution beams 24 on the outer side of the longitudinal beam 21, the concentrated load can be dispersed into multiple smaller forces and transmitted to the longitudinal beam 21 and the cross beam 22 of the main body, and square timbers 25 and bamboo plywood 26 are arranged on the outermost layer of the formwork system. The bamboo plywood 26 can ensure that the concrete surface is flat and smooth, and the square timbers 25 provide support for the bamboo plywood 26. In addition, a stiffening plate 27 is also provided on the inner side of the longitudinal beam 21. Therefore, when the formwork system is installed in place, the stiffening plate 27 will contact one side of the rear anchor block 14. At this time, the rear anchor block 14 will also support the distribution beam and the formwork system 2.

[0026] In the bracket and connection system 3, the bottom of bracket 1 31 is installed with a column foot embedded part 35 for connecting to the cable saddle pier 13, and one side of bracket 1 31 is installed with bracket 2 32 for connecting to the rear anchor block 14. The top of bracket 1 31 is connected to bracket 3 33 through a temporary anchor 34, and the two sides of the outer wall of bracket 3 33 are respectively in contact with the adjacent sides of the inner wall of the longitudinal beam 21. Bracket three 33 includes a steel pipe column 331 and a reinforcing rod 334. The reinforcing rod 334 is located in the middle of the steel pipe column 331. The middle of the steel pipe column 331 is connected to a pile cap 335. The bottom of the steel pipe column 331 is fixedly connected to a flat joint 332, and an oblique joint 333 is connected between the steel pipe column 331 and the reinforcing rod 334. Pile head weldments 336 are installed in the middle of both sides of the steel pipe column 331, and the pile head weldments 336 on both sides are respectively in contact with the adjacent sides of the inner wall of the longitudinal beam 21.

[0027] In this embodiment, the bracket 1 31 is fixed by the column foot embedded part 35, and the bracket 1 31 is the main load-bearing structure, which is used to bear the gravity of the distribution beam and the formwork system 2, and also supports the gravity of the concrete during pouring; the bracket 2 32 is installed on one side of the bracket 1 31 and is connected to the rear anchor block 14 to provide lateral support for the bracket 1 31 to prevent it from shaking or becoming unstable when bearing a huge load. Finally, the bracket 33 is used to support the pouring of the front anchor chamber 15, which is temporarily anchored by a detachable 34 is connected so that the two brackets 1 31 and bracket 3 33 are subjected to coordinated force during operation and can be separated after construction is completed. At the same time, bracket 3 33 is composed of steel pipe columns 331, parallel joints 332, diagonal joints 333 and reinforcing rods 334, and is provided with a pile cap 335 on the top and pile head welded parts 336 on both sides. When bracket 3 33 is installed in place, the pile head welded parts 336 will support the distribution beam and formwork system 2, thereby transmitting the load during the pouring of the front anchor chamber 15 to the entire bracket and connection system. The horizontal connecting device 4 includes a horizontal steel pipe 41 and an embedded device part 45. One side of the horizontal steel pipe 41 is fixedly connected to a plate 42. A sliding round steel 43 is provided on one side of the plate 42. A limiting plate 44 is provided at the bottom of the sliding round steel 43, and the limiting plate 44 is fixedly connected to the plate 42. The embedded device 45 includes an embedded plate 451 and an anchor bar 452. One side of the anchor bar 452 is connected to the rear anchor block 14, and the other side is fixedly connected to the embedded plate 451. One side of the sliding round steel 43 is in contact with one side of the embedded plate 451, and the other side of the horizontal steel pipe 41 is connected to the bracket 2 32.

[0028] In this embodiment, the embedded part 45 of the device is buried inside the rear anchor block 14. Therefore, when the concrete solidifies, the embedded part 45 of the device becomes an external connection point outside the rear anchor block 14. One end of the horizontal steel pipe 41 is connected to the bracket and connection system 3, and the other end is provided with a plate 42. Therefore, when the device is installed, the horizontal steel pipe 41 is located between the bracket and connection system 3 and the rear anchor block 14, and the sliding round steel 43 is against the surface of the embedded plate 451. Therefore, the horizontal thrust generated during the newly poured concrete will be transmitted to the horizontal steel pipe 41, and then through the contact point between the sliding round steel 43 and the embedded plate 451, and finally transmitted to the rear anchor block 14. The temporary anchoring 34 uses a temporary consolidation device 5, which includes a unloading block 51. The top and bottom of the unloading block 51 are respectively provided with an upper cover plate 52 and a lower cover plate 53, and a vertical support plate 54 is provided between the upper cover plate 52 and the lower cover plate 53. The upper cover plate 52 is connected to the bracket three 33, and the lower cover plate 53 is connected to the bracket one 31.

[0029] In this embodiment, by placing the temporary consolidation device 5 on the top of the bracket 1 31, the lower cover 53 is connected to the top surface of the bracket 1 31, and the bottom of the bracket 33 is connected to the top surface of the upper cover plate 52, the bracket 33 and the bracket 1 31 can be connected to form an integral bracket, and a discharge block 51 is provided inside the temporary consolidation device 5 to transfer the load borne by the bracket 3 33. After all the concrete is poured and the permanent structure has sufficient strength, the temporary consolidation of the discharge block 51 is cancelled. At this time, the discharge block 51 will sink, and then the upper cover plate 52 will sink. At this time, a gap will be generated between the bracket 33 and the distribution beam and the formwork system 2. At this time, the square wood 25 and the bamboo plywood 26 can be disassembled, and finally the bracket 33 can be removed from the top of the bracket 1 31.

[0030] Please see the attached Figure 6 -Attached Figure 14 The embodiment of the present invention provides a construction method of a bridge anchor support system suitable for a narrow space, comprising the following steps: Step 1: pouring concrete caisson 11 and pre-embedded column embedded parts 35 of bracket 2 32, then pouring caisson top plate 12 and pouring No. 0 segment of rear anchor block 14; Step 2: Pre-embed the column foot embedded parts 35 and the longitudinal beam embedded parts 28 of the bracket 1 31, then cast the No. 0 segment of the loose cable saddle pier 13, then pre-embed the device embedded parts 45 of the horizontal connection device 4 corresponding to the bracket 1 31, and then further cast the No. 1-2 segments of the rear anchor block 14; Step 3: Set up the main body of the support 1 31 and lay the distribution beam and formwork system 2; Step 4: embed the embedded parts 45 of the horizontal connection device 4 corresponding to the first embedded bracket 31, and after completion, cast the No. 3 segment of the rear anchor block 14, and simultaneously construct the No. 1 segment of the cable saddle pier 13; Step 5: Continue pre-embedding the embedded parts 45 of the horizontal connection device 4 corresponding to the bracket 1 31, and cyclically construct the No. 4-5 segments of the rear anchor block 14 and the No. 2-3 segments of the loose cable saddle pier 13. Then, remove the mold of the No. 2-3 segments of the rear anchor block 14, and then reinstall the horizontal connection device 4 corresponding to the bracket 1 31 at the removed position. Step 6: After constructing the 6-7 segments of the rear anchor block 14, install the horizontal connection device 4 corresponding to the bracket 31 and construct the 4-5 segments of the cable saddle pier 13; Step 7: After casting the No. 8 segment of the rear anchor block 14, set up the second support 32 and install the oblique connection 333 between the second support 32 and the first support 31, then install the temporary consolidation device 5 on the top of the first support 31, and set up the third support 33, and further complete the construction of the No. 6 segment of the pier 14; Step 8: Multi-structure three-dimensional construction: Simultaneously construct segments 9-10 of the rear anchor block 14, segments 7-13 of the loose cable saddle buttress 13, and segments 1-6 of the front anchor chamber 15. Segments 1-6 of the front anchor chamber 15 must be advanced 1 segment later than the loose cable saddle buttress 13, and pre-embedded loose cable saddle brackets in segment 6. Step 9: After the front anchor chamber 15 is poured, the unloading block 51 is released, and the bracket 3 33, bracket 1 31 and bracket 2 32 are removed in sequence, and the rear anchor block 14 and the post-cast section 18 between the loose cable saddle pier 13 are further closed, and the loose cable saddle bracket is further set up to prepare for the installation of the loose cable saddle 17.

[0031] Working principle: When in use, first cast the bottom layer of concrete caisson 11 and caisson top plate 12 to provide the foundation for the entire anchor structure. At this stage, the column foot embedded parts 35 and the longitudinal beam embedded parts 28 need to be pre-embedded in the concrete. At the same time, cast the initial segments of the rear anchor block 14 and the cable saddle pier 13, and pre-embed the embedded plate 451 of the horizontal connecting device 4. Then, a support frame 31 is set up, and distribution beams and a formwork system 2 for pouring concrete are laid on the outer wall of the support frame 31; Then it enters the cycle construction stage: every time a new layer of loose cable saddle pier 13 is to be poured, the horizontal connecting device 4 is installed, that is, one end of the horizontal connecting device 4 is connected to the bracket 1 31, and the other end is connected to the side of the rear anchor block 14 that has been poured and has strength next to it. When the pouring pressure of the new concrete is generated, this horizontal force will be transmitted to the horizontal connecting device 4 through the bracket 1 31, and then the horizontal connecting device 4 will be transmitted to the solidified anchor block 14 to bear it. As the loose cable saddle pier 13 and the rear anchor block 14 are continuously poured, the horizontal connecting device 4 will also be removed and reinstalled to a position higher than the caisson top plate 12. In this process, the pouring speed of the rear anchor block 14 always leads the pouring speed of the loose cable saddle pier 13, that is, it leads each section. When the cable saddle buttress 13 has been poured to the predetermined height, the temporary consolidation device 5 on the top of the support 1 31 is erected, followed by the installation of the support 3 33 on the top of the support 1 31, and finally the pile cap 335 and the column head weldment 336 are built, and the distribution beam and formwork system are erected outside the support 3 33; Then, the rear anchor block 14, the loose cable saddle buttress 13, and the front anchor chamber 15 are cast simultaneously. The weight and construction load of the front anchor chamber 15 are borne by the third support 33. The third support 33 then transfers the load downward to the first support 31 through the temporary consolidation device 5, and then transfers it to the solidified rear anchor block 14. Finally, when all the concrete pouring is completed, the bracket is dismantled. At this time, the unloading block 51 in the temporary consolidation device 5 is removed first, and the bracket three 33 can be caused to settle. At this time, the bracket three 33 cancels the support for the distribution beam and the formwork system 2, and then the square wood 25, bamboo plywood 26 and stiffening plate 27 can be removed, and then the bracket three 33 and bracket one 31 are disassembled. At this time, the bracket and connection system 3 can be divided into two parts, namely bracket one 31 and bracket two 32 as one part, and bracket three 33 is an independent part. At this time, bracket three 33, bracket one 31 and bracket two 32 can be removed and transported out from the cable saddle pier 13 in batches. Finally, the post-casting section 18 is closed and the cable saddle bracket is ready to be installed, and then the cable saddle 17 is installed and the main cable 16 is passed through.

[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A bridge anchor support system suitable for narrow spaces, characterized in that: include: The permanent structure of the anchor body (1) is used to bear the load in conjunction with the temporary support system during the construction process and ultimately constitute the permanent load-bearing structure of the bridge; Distribution beam and formwork system (2), used to directly support and define the shape and size of cast-in-place concrete; A bracket and connection system (3), comprising a bracket 1 (31) for supporting the pouring load of the loose cable saddle pier (13), and a bracket 3 (33) for supporting the pouring load of the front anchor chamber (15), wherein the bracket 1 (31) and the bracket 3 (33) are connected; The horizontal connection device (4) is used to horizontally connect the support and connection system (3) with the cast rear anchor block (14), transfer horizontal loads, and allow the support system to generate vertical relative displacement at the connection point.

2. A bridge anchor support system suitable for narrow spaces according to claim 1, characterized in that: The anchor body permanent structure (1) comprises a concrete caisson (11), the top surface of the concrete caisson (11) is provided with a caisson top plate (12), the top surface of the caisson top plate (12) is provided with a loose cable saddle pier (13), one side of the loose cable saddle pier (13) is connected to a rear anchor block (14), the rear anchor block (14) is provided with a rear anchor chamber (141), a rear anchor surface (142) and a front anchor surface (143) inside, the rear anchor block (14) is provided with a front anchor chamber (15) on the side of the rear anchor block (14) close to the loose cable saddle pier (13), the interior of the front anchor chamber (15) is provided with a rear anchor chamber (141), a rear anchor surface (142) and a front anchor surface (143) inside. The front anchor chamber top plate (151), the front anchor chamber side plate (152), the front anchor chamber front plate (153) and the front anchor chamber bottom plate (154) are provided at the top of the loose cable saddle pier (13). A loose cable saddle (17) is installed at the middle of the loose cable saddle (17). The main cable (16) passes through the front anchor chamber (15) and is connected to the rear anchor block (14). The end of the main cable (16) is located inside the rear anchor chamber (141). A post-casting section (18) is provided between the bottom of the loose cable saddle pier (13) and the rear anchor block (14).

3. The bridge anchor support system suitable for narrow spaces according to claim 2, characterized in that: The distribution beam and formwork system (2) includes a longitudinal beam (21) and a transverse beam (22), one side of the longitudinal beam (21) is connected to the transverse beam (22), and the other side is connected to the longitudinal beam embedded part (28), the outside of the longitudinal beam (21) is alternately provided with small distribution beams (23) and double-jointed small distribution beams (24), and the outer walls of the small distribution beams (23) and double-jointed small distribution beams (24) are provided with square timber (25) and bamboo plywood (26), the interior of the longitudinal beam (21) is provided with a stiffening plate (27), and the square timber (25) is in contact with the loose cable saddle pier (13), and the stiffening plate (27) is in contact with one side of the rear anchor block (14).

4. The bridge anchor support system suitable for narrow spaces according to claim 3, characterized in that: In the bracket and connection system (3), the bottom of the bracket one (31) is installed with a column foot embedded part (35) for connecting to the loose cable saddle pier (13), and one side of the bracket one (31) is installed with a bracket two (32) for connecting to the rear anchor block (14). The top of the bracket one (31) is connected to the bracket three (33) through a temporary anchor (34), and the two sides of the outer wall of the bracket three (33) are respectively in contact with the adjacent sides of the two sides of the inner wall of the longitudinal beam (21).

5. The bridge anchor support system suitable for narrow spaces according to claim 4, characterized in that: The bracket three (33) includes a steel pipe column (331) and a reinforcing rod (334), wherein the reinforcing rod (334) is located in the middle of the steel pipe column (331), a pile cap (335) is connected to the middle of the steel pipe column (331), a flat joint (332) is fixedly connected to the bottom of the steel pipe column (331), and an oblique joint (333) is connected between the steel pipe column (331) and the reinforcing rod (334), and pile head assembly weldments (336) are installed in the middle of both sides of the steel pipe column (331), and the pile head assembly weldments (336) on both sides are respectively in contact with the adjacent sides of the inner wall of the longitudinal beam (21).

6. The bridge anchor support system suitable for narrow spaces according to claim 4, characterized in that: The horizontal connection device (4) includes a horizontal steel pipe (41) and a device embedded part (45), one side of the horizontal steel pipe (41) is fixedly connected to a plate (42), one side of the plate (42) is provided with a sliding round steel (43), the bottom of the sliding round steel (43) is provided with a limit plate (44), and the limit plate (44) is fixedly connected to the plate (42), the device embedded part (45) includes an embedded plate (451) and an anchor bar (452), one side of the anchor bar (452) is connected to the rear anchor block (14), and the other side is fixedly connected to the embedded plate (451), one side of the sliding round steel (43) is in contact with one side of the embedded plate (451), and the other side of the horizontal steel pipe (41) is connected to the second bracket (32).

7. The bridge anchor support system suitable for narrow spaces according to claim 6, characterized in that: The temporary anchoring (34) uses a temporary consolidation device (5), which includes a drop block (51). The top and bottom of the drop block (51) are respectively provided with an upper cover plate (52) and a lower cover plate (53), and a vertical support plate (54) is provided between the upper cover plate (52) and the lower cover plate (53). The upper cover plate (52) is connected to the bracket three (33), and the lower cover plate (53) is connected to the bracket one (31).

8. A construction method for a bridge anchor support system suitable for a narrow space, based on the bridge anchor support system suitable for a narrow space according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: pouring the concrete caisson (11) and pre-embedding the column embedded parts (35) of the bracket 2 (32), then pouring the caisson top plate (12) and pouring the No. 0 segment of the rear anchor block (14); Step 2: pre-embed the column foot embedded parts (35) and the longitudinal beam embedded parts (28) of the bracket one (31), then cast the No. 0 segment of the loose cable saddle pier (13), and then pre-embed the device embedded parts (45) of the horizontal connection device (4) corresponding to the bracket one (31), and then further cast the No. 1-2 segments of the rear anchor block (14); Step 3: Erect the main body of the support frame 1 (31), and lay the distribution beam and formwork system (2); Step 4: embed the embedded part (45) of the horizontal connecting device (4) corresponding to the first embedded bracket (31), and after completion, cast the No. 3 segment of the rear anchor block (14), and simultaneously construct the No. 1 segment of the cable saddle pier (13); Step 5: Continue to embed the embedded parts (45) of the horizontal connection device (4) corresponding to the bracket one (31), and cyclically construct the No. 4-5 segments of the rear anchor block (14) and the No. 2-3 segments of the loose cable saddle pier (13), and then remove the mold of the No. 2-3 segments of the rear anchor block (14). After removal, reinstall the horizontal connection device (4) corresponding to the bracket one (31) at the removed position; Step 6: After constructing the 6-7 segments of the rear anchor block (14), install the horizontal connection device (4) corresponding to the bracket (31) and construct the 4-5 segments of the cable saddle pier (13); Step 7: After casting the No. 8 segment of the rear anchor block (14), set up the second support (32) and install the oblique connection (333) between the second support (32) and the first support (31), then install the temporary consolidation device (5) on the top of the first support (31), and set up the third support (33), and further complete the construction of the No. 6 segment of the pier (14); Step 8: Multi-structure three-dimensional construction: simultaneously carry out the construction of the 9th to 10th segments of the rear anchor block (14), the 7th to 13th segments of the loose cable saddle pier (13) and the 1st to 6th segments of the front anchor chamber (15). The 1st to 6th segments of the front anchor chamber (15) need to lag behind the loose cable saddle pier (13) and advance by 1 segment, and pre-embed the loose cable saddle bracket embedded parts in the 6th segment; Step 9: After the front anchor chamber (15) is poured, the unloading block (51) is removed, and the bracket three (33), bracket one (31) and bracket two (32) are removed in sequence, and the post-cast section (18) between the rear anchor block (14) and the loose cable saddle pier (13) is further closed, and the loose cable saddle bracket is further set up to prepare for the installation of the loose cable saddle (17).

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