Construction method for large-section prestressed capping beam in elevated interval of urban rail transit

Abstract

The invention relates to a construction method of a large-section prestressed capping beam in an elevated interval of urban rail transit, which is characterized in that a steering adjusting groove is arranged on a side supporting plate of a jig frame top beam, and an arc-shaped bottom supporting tenon is arranged on a steel bar bottom supporting plate; a stiff pouring body and a dense water pipe are arranged in the sand box inner cylinder, and a connecting vertical support is arranged between the supporting top plate and the lower row of angle braces; the reserved steel bars at the top of the bridge pier are sleeved with connecting bar hoops, and arch-shaped inner supports are arranged between the connecting bar hoops; the combined supporting system is pre-pressed through a hanging water tank and a back pressure bolt; a bottom die limiting tenon is arranged on the lower surface of the capping beam bottom die, and the verticality of the capping beam side die is adjusted through a template adjusting bolt; a reinforcement cage hanging bracket is used for hanging a bent cap reinforcement cage; the inclined material distributing pipe and the vertical material distributing pipe of the concrete pouring hopper are used for conducting concrete pouring construction on the bent cap; the axis position of the tensioning jack is adjusted by adjusting the supporting rod. The construction quality and efficiency of the bent cap can be improved, and the quality control difficulty is reduced.

Description

Technical Field

[0001] The invention relates to a method for constructing a large-section prestressed cap beam in an elevated section, which is suitable for a large-section prestressed cap beam construction project. Background Art

[0002] As the span of bridges gradually increases, the cross-sectional size of cap beams, as an important load transfer structure between the beam body and the pier, is getting larger and larger. During the pouring of cap beams, it usually includes construction links such as steel cage binding, formwork support, concrete pouring and prestressing. How to improve the construction efficiency of steel cage binding for large-section cap beams, reduce the difficulty of construction of steel cages and formwork for cap beams, and improve on-site construction efficiency has always been an important factor affecting the benefits of cap beam construction.

[0003] There is a temporary support device for the construction of a large-span prestressed cap beam and a construction method thereof. The temporary support device for the construction of a large-span prestressed cap beam includes a jack, a column and a concrete base. The concrete base is arranged on the bottom surface, the jack is connected to the upper end of the concrete base, the column is connected to the upper end of the jack, the upper end of the column is also connected to a longitudinal beam, the upper end of the longitudinal beam is also connected to a cross beam, the upper end of the cross beam is also connected to a cap beam bottom mold, a connecting rod is also arranged above the same row of columns, the short connecting rod passes through the longitudinal beam and the side wall of the groove, a hoop is installed on the upper end of the pier column, and the upper end of the hoop is connected to the jack. This technology focuses on temporary support for the cap beam construction, and vertical support is performed by means of columns, jacks and main pier hoop. The support system itself has poor adjustability and is difficult to arrange.

[0004] There is an assembled prestressed cap beam cantilever platform including a pier body, shear bars, a cap beam body and a cap beam cantilever bracket. The cap beam cantilever bracket includes a main crossbeam, a secondary crossbeam, a main diagonal brace, a secondary diagonal brace and an outer platform tripod. The main crossbeam can be detachably installed on a temporary support. This technology can solve the problem of rapid deployment of the outer platform tripod, but the triangular bracket has poor adjustability, and the formwork system cannot simultaneously meet the problems of prestressed anchor plate positioning and formwork airtightness improvement.

[0005] There is a method for manufacturing a prefabricated cap beam reinforcement frame and a prefabricated cap beam reinforcement cage. The prefabricated cap beam reinforcement frame includes a base frame, multiple positioning frames and a grouting sleeve positioning plate. This technology is mainly used to accurately position the steel bars in the prefabricated cap beam reinforcement cage and the end pre-embedded grouting sleeve; at the same time, when tying the reinforcement cage, it is difficult to tie the bottom and side reinforcements on the same working platform, and the construction efficiency is low.

[0006] In view of this, in order to improve the efficiency of the cap beam reinforcement cage binding, improve the positioning accuracy of the reinforcement cage and the formwork, and reduce the difficulty of prestressed tensioning construction, it is necessary to innovate the construction method of the existing large-section prestressed cap beam. Summary of the invention

[0007] The purpose of the present invention is to provide a method for constructing a large-section prestressed cap beam in an elevated section of an urban rail transit, which not only improves the efficiency of binding the steel cage of the cap beam, but also improves the positioning accuracy of the steel cage and the formwork, and can reduce the difficulty of prestressed tensioning construction.

[0008] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0009] The present invention relates to a construction method for a large-section prestressed cap beam in an elevated section of urban rail transit, comprising the following construction steps:

[0010] S00, Bridge pier construction: Bridge pier construction shall be carried out in accordance with the design and specification requirements, and internal anchor plates and anchor inner pipes shall be installed on the top of the bridge pier;

[0011] S10, cap beam reinforcement cage rotation tire frame binding: tire frame support column and tire frame top beam are arranged on the tire frame bottom plate in sequence, and side support plates are arranged at both ends of the tire frame top beam respectively; a steering adjustment groove with a central angle of 90 degrees is arranged on the side support plate, and a support bolt clamp is arranged on the outer side of the steering adjustment groove; a bottom support adjustment bolt is arranged on the tire frame top beam, and a steel bottom support plate is arranged on the top of the mutually parallel bottom support adjustment bolts, and an arc bottom support falcon is arranged on the upper surface of the steel bottom support plate; the cap beam reinforcement cage includes cap beam longitudinal reinforcement and cap beam Stirrups; after the steering side support bolt passes through the steering adjustment groove, it is connected to the support bolt connection groove on the outside of the longitudinal reinforcement pressure plate through the bolt end connection plate; after the reinforcement binding of the upper and side parts of the cap beam reinforcement cage is completed, the steering side support bolt is rotated 90 degrees along the steering adjustment groove and fixed by the support bolt clamping plate, and then the reinforcement binding of the bottom of the cap beam reinforcement cage is carried out; a reinforcement sleeve is passed through the inside of the cap beam reinforcement cage, and a special-shaped anchor plate is set at the end of the reinforcement sleeve; a pressure dispersion pier with a right-angle trapezoidal cross section is set at both ends of the special-shaped anchor plate;

[0012] S20. Layout of combined support system: The rigid sand box includes a sand box bottom plate, a sand box top plate, a sand box outer tube and a sand box inner tube. The sand box inner tube is in the shape of an inverted cup. C50-C80 concrete is poured inside to form a rigid casting body, and a dense water pipe is arranged in the rigid casting body. A lower row of clamps and an upper row of clamps are arranged from bottom to top on the upper part of the pier, and a lower row of angle braces are arranged on the outer side of the lower row of clamps, and embedded reinforcing bars are arranged on the outer side of the upper row of clamps. The angle braces on the side of the supporting top plate are embedded. The ribs are embedded in the connection groove formed by the embedded ribs and the upper row of hoop, and a connecting vertical brace is set between the supporting top plate and the lower row of angle braces; a supporting column is set outside the pier, and a rigid sand box is set on the top of the supporting column; the height of the sand box top plate is adjusted according to the bottom elevation requirements of the supporting longitudinal beam, and then the sand box is filled with sand and water through a dense water pipe; a supporting longitudinal beam is arranged on the upper surface of the rigid sand box and the supporting top plate, and a connecting tie beam and a supporting top plate are sequentially set on the upper part of the supporting longitudinal beam;

[0013] S30, pre-stressing of the combined support system: a boom top beam is arranged on the support top plate, and a water tank boom and a hanging water tank are arranged in sequence at the lower part of the boom top beam; a connecting bar clamp is arranged on the steel bar extension section at the top of the pier, and a clamp connecting bar is arranged between adjacent connecting bar clamps, and a counter-pressure connecting plate is welded on the outer side of the connecting bar clamp parallel to the short side direction of the pier; an arched inner support is arranged between the mirror-image connecting bar clamps, and one end of the stabilizing pull bolt is first connected to the anchor inner tube, and the other end is passed through the arched inner support and then an arc-shaped pressure plate is arranged, and fastened by a stabilizing pressure bolt; a counter-pressure support plate is arranged on the outer side of the counter-pressure connecting plate, and a counter-pressure bolt is arranged between the counter-pressure support plate and the support top plate; water is supplied to the hanging water tank through an external water supply device, and a tightening pressure is applied through the counter-pressure bolt, so as to simultaneously pre-stress the support top plate and the support system below it;

[0014] S40, cap beam formwork support: remove the hanging water tank, stabilizing bolts, connecting reinforcement hoop, counter-pressure support plate, arched inner support and counter-pressure bolts on the combined support system; set a bottom formwork limit groove and a position-controlling side shackle with a right-angle trapezoidal cross section on the upper surface of the support top plate; pre-connect the cap beam side formwork with the cap beam bottom formwork tightly, and set a bottom formwork limit shackle connected to the bottom formwork limit groove on the lower surface of the cap beam bottom formwork; first use external lifting equipment to lift the cap beam side formwork, cap beam bottom formwork and cap beam end formwork onto the support top plate, and make The bottom mold limiter is connected to the bottom mold limiter groove, and then the verticality of the cap beam side mold is adjusted by the mold adjustment bolt set between the cap beam side mold and the supporting top plate, and the vertical pressure is applied to the top pressure plate by tightening the pressure bolt to control the position of the cap beam side mold; a fixed angle bottom support and an end vertical support are set on the outer side of the cap beam end mold, and the bottom of the fixed angle bottom support is connected to the supporting top plate through the bottom support slide plate; the end mold control bolt and the bottom support control bolt on the end vertical support are used to apply lateral control thrust to the cap beam end mold and the fixed angle bottom support;

[0015] S50, hanging and placing the cap beam reinforcement cage: the reinforcement cage hanger includes a hanger bottom support, a hanger hoop plate, a sliding support groove, a sliding support plate and a lateral alignment body, and the top of the sliding support plate is connected to the connecting hanger rod, the sliding support plate is embedded in the sliding support groove, and the hanger hoop plate is welded on the hanger bottom support; the side of the connecting hanger rod is connected to the lateral alignment body; the hanger hoop plate is first connected to the two rows of cap beam longitudinal bars on the upper part of the cap beam reinforcement cage, and then the cap beam reinforcement cage is hung and placed inside the cap beam side form and the cap beam end form by external lifting equipment, and then the lateral position of the cap beam reinforcement cage is adjusted by the lateral alignment body; the cap beam reinforcement cage is positioned during the pouring of the cap beam concrete by the cantilever inner support bars and the corner hanging bars on the end vertical supports;

[0016] S60, cap beam concrete pouring: the concrete pouring hopper includes a collection box trough, an oblique distribution pipe, a vertical distribution pipe and a discharge vibrator, wherein the oblique distribution pipe is symmetrically arranged in an eight-shaped shape, at an angle of 45 to 60 degrees to the horizontal plane, and the pipe opening diameter of the oblique distribution pipe is 0 to 5 cm higher than the vertical distribution pipe; concrete is poured into the collection box trough by using external concrete pouring equipment, and concrete pouring construction is carried out through the vertical distribution pipe and the oblique distribution pipe at the same time, and a vibration load is applied to the vertical distribution pipe and the oblique distribution pipe by the discharge vibrator to pour the cap beam concrete;

[0017] S70. Prestressed tendon tensioning: After the strength of the cap beam concrete is formed, a suspension hoop is arranged at the end of the cap beam, and a bottom support connecting rod and a cantilever bottom support are arranged in sequence below the suspension hoop, a top support connecting rod and a vertical support column are arranged on the upper surface of the suspension hoop, and the cantilever top support is fixed by the top support connecting rod; a top support connecting column is arranged between the cantilever bottom support and the cantilever top support; a suspension reinforcement connected to the cantilever top support is arranged on the vertical support column; an anchor hanger and an operating support plate are arranged in sequence at the lower part of the cantilever top support, and a row of adjusting support rods are arranged on the upper surface of the operating support plate, and a jack hoop is arranged at the top of the adjusting support rod; the prestressed tendon is passed along the tendon sleeve and through the tensioning jack; first, the tensioning jack is firmly connected to the jack hoop, and then the axis position of the tensioning jack is adjusted by adjusting the support rod, and then the prestressing prestress is applied to the prestressed tendon by the tensioning jack.

[0018] In step S00, the anchor inner tube is formed by rolling a spiral tube and is vertically welded to the built-in anchor plate.

[0019] In step S10, the arc-shaped bottom support is made of rolled steel plate with a central angle of degrees. The spacing of the arc-shaped bottom support is the same as the spacing of the cap beam longitudinal bars of the cap beam reinforcement cage; the support bolt connecting groove includes two steel plates with "L"-shaped cross-sections, which are arranged in mirror symmetry; the bolt end connecting plate is made of rolled steel plate and is vertically welded to the steering side support bolt.

[0020] In step S20, the embedded reinforcing bar is made of rolled steel plate, and is enclosed with the upper row of hoops to form a connecting groove with a right-angled trapezoidal cross section; the connecting vertical support includes a screw and a nut, and the tightening directions of the screws at both ends of the nut are opposite; the sand box outer tube and the sand box inner tube are both made of rolled steel plate, and a sand discharge pipe is arranged at the bottom of the sand box outer tube, and the inner diameter of the sand box outer tube is 0.5 to 1 cm larger than the outer diameter of the bottom of the sand box inner tube.

[0021] In step S30, the arched inner support is made of rolled steel plate, and its two ends are welded to the connected connecting reinforcement hoops, and a hole is set in the middle for the stabilizing pressure bolt to pass through; the arc pressure plate is made of rolled steel plate, and the lower surface is set with a curved surface with the same curvature as the arched inner support; the hoop connecting reinforcement is made of rolled steel plate, and its two ends are welded to the connected hoop connecting reinforcement.

[0022] In step S40, the cross section of the control side mold is a right-angled trapezoid, and a fastening bolt connected to the top pressure plate is arranged on the control side mold; the top pressure plate is made of rolled steel plate, and its cross section is "L"-shaped. A connecting vertical plate with a right-angled trapezoidal cross section is arranged at the insertion section of the top pressure plate, and holes for fastening bolts to pass through are arranged on the top plate; the cap beam side mold is made of rolled steel plate, and a side mold connecting mold is arranged on the outer side of the cap beam side mold; the template adjustment bolt includes a nut and a screw, and the tightening directions of the screws on both sides of the nut are opposite, so that The two ends of the formwork adjustment bolt are connected to the cap beam side formwork and the supporting top plate through the bolt end ball joint; the cap beam end formwork is made of rolled steel plate, and holes for special-shaped anchor plates to pass through are preset on the cap beam end formwork; the fixed-angle bottom support is made of rolled steel plate, and the inclination angle of the upper surface is the same as the inclination angle of the cap beam end formwork; the end vertical support is made of rolled steel plate, and screw holes connected to the end formwork control bolts and the bottom support control bolts are preset on the end vertical support, and cantilever internal support bars and corner hanging bars for hoisting and positioning the cap beam reinforcement cage are arranged on the top of the end vertical support.

[0023] In step S50, the sliding support groove is made of rolled steel plate, and a groove with an inverted "T" cross-section for the sliding support plate to slide is set on the sliding support groove, and a lateral support pier is set on the upper surface of the sliding support groove; the hanger hoop plate is made of rolled steel plate, with a semicircular cross-section, an inner diameter that is the same as the outer diameter of the longitudinal reinforcement of the cap beam, and is welded to the hanger bottom support; the lateral positioning body adopts a hydraulic jack, and its two ends are respectively connected to the lateral support piers and the connecting hanger rod.

[0024] In step S60, the collecting box trough is made of rolled steel plate and is cup-shaped. The bottom end is connected to the vertical distribution pipe, and the side wall is connected to the oblique distribution pipe. The discharge vibrator is an attached surface vibrator. The vertical distribution pipe and the oblique distribution pipe are made of steel pipes with a thickness of 0.2 to 0.4 mm.

[0025] In step S70, the support rod includes a nut and a screw, and the tightening directions of the screws on both sides of the nut are opposite, one end is welded to the working support plate, and the other end is connected to the jack clamp through an adjustable ball joint.

[0026] The present invention has the following characteristics and beneficial effects

[0027] 1) Side support plates are respectively arranged at both ends of the tire frame top beam, and a steering adjustment groove with a central angle of 90 degrees is arranged on the side support plates, which can meet the requirements for the bottom steel bar binding of the cap beam steel cage and reduce the difficulty of binding the cap beam steel cage; at the same time, a steel bar bottom support plate is arranged on the top of the mutually parallel bottom support adjustment bolts, and an arc-shaped bottom support falcon is arranged on the upper surface of the steel bar bottom support plate, so as to realize the rapid binding and positioning of the cap beam steel cage.

[0028] 2) The inner tube of the rigid sand box is in the shape of an inverted cup, and a rigid cast body and a dense water pipe are arranged inside the inner tube of the sand box, which can simultaneously meet the requirements of improving the rigidity of the rigid sand box and improving the density of the sand filling in the sand box; at the same time, the angle brace on the side of the supporting top plate is embedded in the connecting groove formed by the embedded brace reinforcement and the upper row of hoops, so as to achieve the purpose of enhancing the stability of the supporting top plate and rapid installation; a connecting vertical brace is arranged between the supporting top plate and the lower row of angle braces, so as to realize the coordinated bearing of the upper row of hoops and the lower row of hoops.

[0029] 3) A connecting bar hoop is provided on the extended section of the steel bar at the top of the pier, and a counter-pressure connecting plate and a counter-pressure support plate are welded on the outside of the connecting bar hoop. An arched inner support is provided between the mirror-image connecting bar hoops. The anchor inner tube and the arched inner support are connected as a whole by a stabilizing bolt 100, thereby enhancing the stability and rigidity of the counter-pressure support plate. A hanging water tank and counter-pressure bolts are used to pre-compress the support top plate and the combined support system, thereby realizing rapid pre-compression of the support system.

[0030] 4) A bottom mold limit groove is set on the upper surface of the supporting top plate, and the bottom mold limit falcon is connected to the bottom mold limit groove, so as to enhance the anti-slip stability of the bottom mold of the cap beam; the verticality of the cap beam side mold is adjusted by the template adjusting bolt, and the vertical pressure is applied to the falcon top pressure plate by tightening the pressure bolt, so as to realize the precise positioning of the cap beam side mold.

[0031] 5) The hanger hoop of the steel cage hanger is connected to the longitudinal steel bars of the cap beam steel cage, and the lateral position of the cap beam steel cage can be adjusted through the lateral alignment body, thereby realizing the rapid lifting and accurate positioning of the cap beam steel cage.

[0032] 6) The inclined distribution pipe and the vertical distribution pipe of the concrete pouring hopper are used simultaneously for the cap beam concrete pouring construction. At the same time, the vertical distribution pipe and the inclined distribution pipe can be applied with a discharge vibrator to improve the cap beam concrete pouring quality.

[0033] 7) A cantilever bottom support and a cantilever top support are respectively arranged below and above the suspension hoop, and a cantilever suspension rod connected to the cantilever top support is arranged on the vertical support column, thereby enhancing the stability of the cantilever bottom support; at the same time, an adjusting support rod is arranged on the upper surface of the working support plate, and the axis position of the tensioning jack can be adjusted by adjusting the support rod, thereby realizing efficient tensioning of the prestressed reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a construction flow chart of a large-section prestressed cap beam for an elevated section of urban rail transit according to the present invention;

[0035] Figure 2 yes Figure 1 Cap beam reinforcement cage tyre frame;

[0036] Figure 3 yes Figure 2Steering side support bolt and side support plate connection structure;

[0037] Figure 4 yes Figure 2 Steel bar bottom support plate layout structure;

[0038] Figure 5 yes Figure 1 Pre-stressed elevation drawing of combined support system;

[0039] Figure 6 yes Figure 5 Schematic diagram of the rigid sand box structure;

[0040] Figure 7 yes Figure 5 Top view of preloading of combined support system;

[0041] Figure 8 yes Figure 1 Lifting and placing of cap beam reinforcement cage and formwork support structure;

[0042] Fig. 9 yes Figure 8 Schematic diagram of the steel cage hanger structure;

[0043] Fig.10 yes Figure 1 Cap beam end formwork support structure;

[0044] Fig.11 yes Figure 1 Cap beam concrete pouring hopper structure;

[0045] Fig.12 yes Figure 1 Prestressed steel bar tensioning structure.

[0046] In the figure: 1, bridge pier; 2, built-in anchor plate; 3, anchor inner tube; 4, cap beam reinforcement cage; 5, tire frame bottom plate; 6, tire frame support column; 7, tire frame top beam; 8, side support plate; 9, steering adjustment groove; 10, support bolt clamping plate; 11, bottom support adjustment bolt; 12, steel bottom support plate; 13, arc bottom support falcon; 14, cap beam longitudinal reinforcement; 15, cap beam stirrups; 16, steering side support bolt; 17, longitudinal reinforcement pressure plate; 18, support bolt connecting groove; 19, bolt end connecting plate; 20 , tie rod sleeve; 21, special-shaped anchor plate; 22, pressure dispersion pier; 23, rigid sand box; 24, sand box bottom plate; 25, sand box top plate; 26, sand box outer tube; 27, sand box inner tube; 28, rigid cast body; 29, dense water pipe; 30, lower row of clamps; 31, upper row of clamps; 32, lower row of angle braces; 33, embedded braces; 34, supporting top plate; 35, angle brace embedded braces; 36, connecting vertical braces; 37, supporting columns; 38, supporting longitudinal beams;

[0047] 39. Sand box filling; 40. Connecting tie beam; 41. Sand discharge pipe; 42. Top beam of suspension rod; 43. Water tank suspension rod;

[0048] 44. Hanging water tank; 45. Connecting bar hoop; 46. Connecting bar hoop; 47. Counter-pressure connecting plate; 48. Arched inner support; 49. Arc pressure plate; 50. Stable pressure bolt; 51. Counter-pressure support plate; 52. Counter-pressure bolt; 53. Bottom formwork limit groove; 54. Positioning side pier; 55. Cap beam side form; 56. Cap beam bottom form; 57. Bottom formwork limit pier; 58. Formwork adjustment bolt; 59. Fastening pressure bolt; 60. Top pressure plate; 61. Connecting vertical plate; 62. Steel cage hanger; 63. Hanger bottom support; 64. Hanger hoop plate; 65. Sliding support groove; 66. Sliding support plate; 67. Lateral alignment body; 68. Connecting hanger rod; 69. Cap beam end form; 70. Lateral support pier; 71. Concrete pouring hopper; 72. Aggregate box trough; 73 , oblique material distribution pipe; 74, vertical material distribution pipe; 75, discharge vibrator; 76, cap beam concrete; 77, suspension hoop; 78, bottom support connecting rod; 79, cantilever bottom support; 80, top support connecting rod; 81, vertical support column; 82, cantilever top support; 83, top support connecting column; 84, suspended suspension bar; 85, anchor suspension rod; 86, working support plate; 87, adjustment support rod; 88, jack hoop; 89, prestressed tension bar; 90, tensioning jack; 91, adjustment ball joint; 92, cap beam end formwork; 93, fixed angle bottom support; 94, end vertical support; 95, bottom support slide plate; 96, end formwork control bolt; 97, bottom support control bolt; 98, cantilever inner support bar; 99, corner suspension bar; 100, stable pull bolt; 101, bolt end ball joint. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0050] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0051] Figure 1 This is the construction flow chart of the large-section prestressed cap beam in the elevated section of urban rail transit in the present invention, referring to Figure 1 As shown in the figure, the construction method of large-section prestressed cap beam in the elevated section of urban rail transit includes the following construction steps:

[0052] 1) Pier construction: Pier 1 is constructed according to the design and specification requirements, and a built-in anchor plate 2 and an anchor inner pipe 3 are set on the top of the pier 1;

[0053] 2) Cap beam steel cage rotation tire frame binding: tire frame support column 6 and tire frame top beam 7 are arranged on the tire frame bottom plate 5 in sequence, and side support plates 8 are respectively arranged at both ends of the tire frame top beam 7; a steering adjustment groove 9 with a central angle of 90 degrees is arranged on the side support plate 8, and a support bolt clamping plate 10 is arranged on the outer side of the steering adjustment groove 9; a bottom support adjustment bolt 11 is arranged on the tire frame top beam 7, and a steel bottom support plate 12 is arranged at the top of the mutually parallel bottom support adjustment bolts 11, and an arc bottom support falcon 13 is arranged on the upper surface of the steel bottom support plate 12; the cap beam steel cage 4 includes cap beam longitudinal reinforcement 14 and cap beam stirrups 1 5; After the steering side support bolt 16 passes through the steering adjustment groove 9, it is connected to the support bolt connection groove 18 on the outer side of the longitudinal reinforcement pressure plate 17 through the bolt end connection plate 19; after the reinforcement binding of the upper and side parts of the cap beam reinforcement cage 4 is completed, the steering side support bolt 16 is rotated 90 degrees along the steering adjustment groove 9 and fixed by the support bolt clamping plate 10, and then the reinforcement binding of the bottom of the cap beam reinforcement cage 4 is carried out; a reinforcement sleeve 20 is passed through the interior of the cap beam reinforcement cage 4, and a special-shaped anchor plate 21 is arranged at the end of the reinforcement sleeve 20; a pressure dispersion pier 22 with a right-angle trapezoidal cross section is arranged at both ends of the special-shaped anchor plate 21;

[0054] 3) Arrangement of combined support system: The rigid sand box 23 includes a sand box bottom plate 24, a sand box top plate 25, a sand box outer tube 26 and a sand box inner tube 27. The sand box inner tube 27 is in the shape of an inverted cup. Concrete with elevation C50-C80 is poured inside to form a rigid casting body 28, and a dense water pipe 29 is arranged in the rigid casting body 28; a lower row of clamps 30 and an upper row of clamps 31 are arranged in sequence from bottom to top on the upper part of the pier 1, and a lower row of angle braces 32 are arranged on the outer side of the lower row of clamps 30, and an embedded reinforcing bar 33 is arranged on the outer side of the upper row of clamps 31; the angle braces on the side of the supporting top plate 34 are embedded with reinforcing bars 35 Embedded in the connection groove formed by the embedded anchor bar 33 and the upper row of hoop 31, a connection vertical brace 36 is provided between the support top plate 34 and the lower row of angle braces 32; a support column 37 is provided outside the pier 1, and a rigid sand box 23 is provided at the top of the support column 37; according to the bottom elevation requirement of the support longitudinal beam 38, the height of the sand box top plate 25 is adjusted, and then the sand box is filled with sand 39 and water is injected through the dense water pipe 29; a support longitudinal beam 38 is arranged on the upper surface of the rigid sand box 23 and the support top plate 34, and a connection tie beam 40 and a support top plate 34 are provided in sequence on the upper part of the support longitudinal beam 38;

[0055] 4) Pre-stressing of the combined support system: a suspension rod top beam 42 is arranged on the support top plate 34, and a water tank suspension rod 43 and a hanging water tank 44 are arranged in sequence at the lower part of the suspension rod top beam 42; a connecting bar hoop 45 is arranged on the steel bar extension section at the top of the pier 1, and a hoop connecting bar 46 is arranged between adjacent connecting bar hoop 45, and a counter-pressure connecting plate 47 is welded on the outer side of the connecting bar hoop 45 parallel to the short side direction of the pier 1; an arched inner support 48 is arranged between the mirror-image connecting bar hoop 45, first One end of the stabilizing bolt 100 is connected to the anchor inner tube 3, and the other end is passed through the arched inner support 48 and then provided with an arc-shaped pressure plate 49, which is fastened by the stabilizing pressure bolt 50; a back-pressure support plate 51 is provided on the outer side of the back-pressure connecting plate 47, and a back-pressure bolt 52 is provided between the back-pressure support plate 51 and the support top plate 34; water is supplied to the hanging water tank 44 through an external water supply device, and a fastening pressure is applied through the back-pressure bolt 52, so as to pre-press the support top plate 34 and the support system below it simultaneously;

[0056] 5) Support of cap beam formwork: remove the hanging water tank 44, the stabilizing bolt 50, the connecting bar hoop 45, the counter-pressure support plate 51, the arched inner support 48 and the counter-pressure bolt 52 on the combined support system; set a bottom mold limit groove 53 and a control side falcon 54 with a right-angle trapezoidal cross section on the upper surface of the support top plate 34; pre-connect the cap beam side mold 55 and the cap beam bottom mold 56 tightly, and set a bottom mold limit falcon 57 connected to the bottom mold limit groove 53 on the lower surface of the cap beam bottom mold 56; first use external lifting equipment to hang the cap beam side mold 55, the cap beam bottom mold 56 and the cap beam end mold 92 on the support top plate 34, and make the bottom mold limit The position 57 is connected to the bottom mold limit groove 53, and then the verticality of the cap beam side mold 55 is adjusted by the mold adjustment bolt 58 set between the cap beam side mold 55 and the supporting top plate 34, and the vertical pressure is applied to the top pressure plate 60 by tightening the pressure bolt 59 to control the position of the cap beam side mold 55; a fixed angle bottom support 93 and an end vertical support 94 are set on the outer side of the cap beam end mold 92, and the bottom of the fixed angle bottom support 93 is connected to the supporting top plate 34 through the bottom support slide plate 95; the end mold control bolt 96 and the bottom support control bolt 97 on the end vertical support 94 are used to apply lateral control thrust to the cap beam end mold 92 and the fixed angle bottom support 93;

[0057] 6) Lifting of the cap beam reinforcement cage: the reinforcement cage hanger 62 includes a hanger bottom support 63, a hanger hoop plate 64, a sliding support groove 65, a sliding support plate 66 and a lateral alignment body 67, and the top of the sliding support plate 66 is connected to the connecting rod 68, the sliding support plate 66 is embedded in the sliding support groove 65, and the hanger hoop plate 64 is welded on the hanger bottom support 63; the side of the connecting rod 68 is connected to the lateral alignment body 67; firstly, the hanger hoop plate 64 is connected to the two rows of cap beam longitudinal bars 14 on the upper part of the cap beam reinforcement cage 4, and then the cap beam reinforcement cage 4 is lifted and placed inside the cap beam side mold 55 and the cap beam end mold 69 by external lifting equipment, and then the lateral position of the cap beam reinforcement cage 4 is adjusted by the lateral alignment body 67; the cap beam reinforcement cage 4 is positioned during the pouring of the cap beam concrete 76 by the cantilever inner support bars 98 and the corner suspension bars 99 on the end vertical support 94;

[0058] 7) Casting of cap beam concrete: The concrete casting hopper 71 includes a material collecting box trough 72, an oblique material distributing pipe 73, a vertical material distributing pipe 74 and a discharge vibrator 75, wherein the oblique material distributing pipe 73 is symmetrically arranged in an eight-shaped shape, at an angle of 45 to 60 degrees to the horizontal plane, and the diameter of the pipe opening of the oblique material distributing pipe 73 is 0 to 5 cm higher than that of the vertical material distributing pipe 74; concrete is poured into the material collecting box trough 72 by an external concrete pouring device, and concrete pouring construction is carried out through the vertical material distributing pipe 74 and the oblique material distributing pipe 73 simultaneously, and a vibration load is applied to the vertical material distributing pipe 74 and the oblique material distributing pipe 73 by the discharge vibrator 75, and the cap beam concrete 76 is poured;

[0059] 8) Prestressed tendon tensioning: After the strength of the cap beam concrete 76 is formed, a suspension hoop 77 is provided at the end of the cap beam, and a bottom support connecting rod 78 and a cantilever bottom support 79 are provided in sequence below the suspension hoop 77, and a top support connecting rod 80 and a vertical support column 81 are provided on the upper surface of the suspension hoop 77. The top support connecting rod 80 is used to fix the cantilever top support 82; a top support connecting column 83 is provided between the cantilever bottom support 79 and the cantilever top support 82; a suspension hanging bar 84 connected to the cantilever top support 82 is provided on the vertical support column 81; 2 is provided with an anchor hanger 85 and an operation support plate 86 in sequence at the lower part, and 2 to 3 rows of adjusting support rods 87 are provided on the upper surface of the operation support plate 86, and a jack clamp 88 is provided at the top of the adjusting support rod 87; the prestressed reinforcement 89 is passed along the reinforcement sleeve 20 and passes through the tensioning jack 90; the tensioning jack 90 is first firmly connected with the jack clamp 88, and then the axial position of the tensioning jack 90 is adjusted by adjusting the support rod 87, and then the tensioning jack 90 applies tensioning prestress to the prestressed reinforcement 89.

[0060] Figure 2 yes Figure 1 Cap beam reinforcement cage tyre frame, Figure 3 yes Figure 2 Steering side support bolt and side support plate connection structure, Figure 4 yes Figure 2Steel bar bottom support plate layout structure, Figure 5 yes Figure 1 Prestressed elevation drawing of combined support system, Figure 6 yes Figure 5 Schematic diagram of the rigid sand box structure. Figure 7 yes Figure 5 Top view of preloading of combined support system. Figure 8 yes Figure 1 Lifting and placing of cap beam reinforcement cage and formwork support structure, Fig. 9 yes Figure 8 Schematic diagram of steel cage hanger structure. Fig.10 yes Figure 1 Cap beam end formwork support structure, Fig.11 yes Figure 1 Cap beam concrete pouring hopper structure, Fig.12 yes Figure 1 Prestressed steel bar tension structure. Figure 2 to Figure 12 shown.

[0061] The concrete strength grade of the pier 1 is C50. An internal anchor plate 2 and an anchor inner tube 3 are arranged on the top of the pier 1. The internal anchor plate 2 is rolled from a steel plate with a thickness of 20 mm. The anchor inner tube 3 is rolled from a spiral tube with a diameter of 60 mm and is vertically welded to the internal anchor plate 2.

[0062] The cap beam reinforcement cage is tied on the rotating tire frame. The tire frame bottom plate 5 is rolled from a steel plate with a thickness of 10 mm. The tire frame support column 6 and the tire frame top beam 7 are arranged in sequence on the tire frame bottom plate 5. The tire frame support column 6 is made of an H-shaped steel with a specification of 300×300×10×15; the tire frame top beam 7 is rolled from a steel plate with a thickness of 10 mm. Side support plates 8 are arranged at both ends of the tire frame top beam 7. The side support plates 8 are rolled from a steel plate with a thickness of 20 mm. A steering adjustment groove 9 with a central angle of ninety degrees is arranged on the side support plates 8. The width of the steering adjustment groove 9 is 30 mm, and a support bolt clamp 10 is arranged on the outer side of the steering adjustment groove 9. The support bolt clamp 10 is rolled from a steel plate with a width of 20 mm; a bottom support adjustment bolt 11 is arranged on the tire frame top beam 7. The bottom support adjustment bolt 11 is rolled from a screw with a diameter of 100 mm and is parallel to the bottom support. A steel bottom support plate 12 is arranged at the top of the adjusting bolt 11, and the steel bottom support plate 12 is made of a steel plate with a thickness of 20 mm; an arc bottom support 13 is arranged on the upper surface of the steel bottom support plate 12, and the arc bottom support 13 is rolled from a steel plate with a thickness of 30 mm; the cap beam reinforcement cage 4 includes a cap beam longitudinal reinforcement 14 and a cap beam stirrup 15, which are respectively made of threaded steel bars with diameters of 25 mm and 12 mm; the steering side support bolt 16 is rolled from a screw rod with a diameter of 30 mm, so that the steering side support bolt 16 passes through the steering adjustment slot 9 and is in contact with the longitudinal reinforcement pressure plate 1 The bolt connecting groove 18 on the outside of 7 is connected by the bolt end connecting plate 19. The longitudinal reinforcement pressing plate 17 is made of a steel plate with a thickness of 10mm and a width of 5cm. The bolt connecting groove 18 includes two steel plates with a cross section of "L" shape, which are arranged in a mirror-symmetrical manner and are made of a steel plate with a thickness of 30mm. The bolt end connecting plate 19 is made of a steel plate with a thickness of 20mm and is vertically welded to the steering side bolt 16. After the steel bars on the upper and side of the cap beam steel cage 4 are tied, the steering side bolt 16 is rotated 90 degrees along the steering adjustment groove 9. , and fixed by the bolt clamping plate 10, and then the steel bars at the bottom of the cap beam reinforcement cage 4 are tied; a reinforcement sleeve 20 is passed through the interior of the cap beam reinforcement cage 4, and the reinforcement sleeve 20 adopts a corrugated pipe with a diameter of 60mm; a special-shaped anchor plate 21 is arranged at the end of the reinforcement sleeve 20; the special-shaped anchor plate 21 is rolled from a steel plate with a thickness of 30mm; a pressure dispersion pier 22 with a right-angled trapezoidal cross section is arranged at both ends of the special-shaped anchor plate 21, and the pressure dispersion pier 22 is rolled from a steel plate with a thickness of 20mm, and has a right-angled trapezoidal cross section;

[0063] The rigid sand box 23 includes a sand box bottom plate 24, a sand box top plate 25, a sand box outer tube 26 and a sand box inner tube 27. The sand box bottom plate 24 and the sand box top plate 25 are both rolled from 20mm thick steel plates; the sand box outer tube 26 and the sand box inner tube 27 are both rolled from steel plates into a cylindrical shape, wherein the sand box inner tube 27 is in the shape of an inverted cup mouth, and C50 concrete is poured inside to form a rigid casting body 28, and a dense water pipe 29 is arranged inside the rigid casting body 28, and the dense water pipe 29 is a plastic pipe with a diameter of 30mm. The inner diameter of the sand box outer tube 26 is 1cm larger than the outer diameter of the bottom of the sand box inner tube 27

[0064] The lower row of clamps 30 and the upper row of clamps 31 are arranged in order from bottom to top on the upper part of the bridge pier 1. The lower row of clamps 30 and the upper row of clamps 31 are both made of rolled steel plates with a thickness of 20 mm. The lower row of angle braces 32 are welded on the outer side of the lower row of clamps 30. The lower row of angle braces 32 are made of rolled steel plates with a thickness of 30 mm. The embedded steel bars 33 are welded on the outer side of the upper row of clamps 31. The embedded steel bars 33 are made of rolled steel plates with a thickness of 20 mm, and are combined with the upper row of clamps 31 to form a connecting groove with a right-angle trapezoidal cross section. The supporting top plate 34 is made of rolled steel plates with a thickness of 20 mm, so that the angle brace embedded steel bars 35 on the side of the supporting top plate 34 are embedded in the connecting groove formed by the embedded steel bars 33 and the upper row of clamps 31. The angle brace embedded steel bars 35 are made of rolled steel plates with a thickness of 30 mm, and have a right-angle trapezoidal cross section. A connecting vertical brace 36 is arranged between the supporting top plate 34 and the lower row of angle braces 32. The connecting vertical brace 36 includes a screw and a nut with a diameter of 60 mm, and the tightening directions of the screws on both sides of the nut are opposite. A supporting column 37 is arranged outside the pier 1. The supporting column adopts a steel pipe with a diameter of 200 mm. A supporting longitudinal beam 38 is arranged on the upper surface of the rigid sand box 23 and the supporting top plate 34. The supporting longitudinal beam 38 adopts an H-shaped steel with a specification of 250×250×9×14. A connecting tie beam 40 and the supporting top plate 34 are arranged in sequence on the upper part of the supporting longitudinal beam 38. The connecting tie beam 40 adopts an H-shaped steel with a specification of 200×200×8×12. The supporting top plate 34 adopts a steel plate with a thickness of 10 mm. The sand box filling sand 39 adopts medium-coarse sand with uniform particle size.

[0065] A sand discharge pipe 41 is provided at the bottom of the sand box outer tube 26 , and the sand discharge pipe 41 is a steel pipe with a diameter of 60 mm.

[0066] A boom top beam 42 is arranged on the supporting top plate 34, and the boom top beam 42 adopts H-shaped steel with a specification of 200×200×8×12; a water tank boom 43 and a hanging water tank 44 are arranged in sequence at the lower part of the boom top beam 42, and the water tank boom 43 adopts a screw with a diameter of 60mm; the hanging water tank 44 is made of a steel plate with a thickness of 10mm and is rolled into a closed box shape. A connecting bar hoop 45 is provided on the protruding section of the steel bar at the top of the pier 1. The connecting bar hoop 45 is made of a steel pipe with a wall thickness of 10 mm. A connecting bar hoop 46 is provided between adjacent connecting bar hoops 45. The connecting bar hoop 46 is made of a steel plate with a thickness of 10 mm, and both ends are welded and connected to the connected connecting bar hoop 46. A counter-pressure connecting plate 47 is welded on the outer side of the connecting bar hoop 45 parallel to the short side direction of the pier 1. The counter-pressure connecting plate 47 is made of a steel plate with a thickness of 20 mm. An arched inner support 48 is provided between the mirror-image connecting bar hoops 45. The arched inner support 48 is made of a steel plate with a thickness of 20 mm and is in an arc shape with a central angle of 60 degrees.

[0067] The stabilizing bolt 100 uses a screw rod that matches the anchor inner tube 3. First, one end of the stabilizing bolt 100 is connected to the anchor inner tube 3, and the other end passes through the arched inner support 48 and then an arc-shaped pressure plate 49 is set. The arc-shaped pressure plate 49 is made of a steel plate with a thickness of 20 mm and has the same curvature as the connected arched inner support 48. The stabilizing pressure bolt 50 uses a nut that matches the stabilizing bolt 100.

[0068] A counter-pressure support plate 51 is arranged on the outer side of the counter-pressure connecting plate 47. The counter-pressure support plate 51 is rolled from a steel plate with a thickness of 20 mm. A counter-pressure bolt 52 is arranged between the counter-pressure support plate 51 and the supporting top plate 34. The counter-pressure bolt 52 includes a screw and a nut with a diameter of 60 mm, and the tightening directions of the screws on both sides of the nut are opposite.

[0069] Water is supplied to the hanging water tank 44 through an external water supply device, and tightening pressure is applied through the back-pressure bolts 52, so as to simultaneously pre-press the supporting top plate 34 and the supporting system below it.

[0070] A bottom mold limit groove 53 and a position control side falcon 54 with a right-angled trapezoidal cross section are set on the upper surface of the supporting top plate 34; the bottom mold limit groove 53 is excavated into a right-angled trapezoid; the position control side falcon 54 is rolled from a steel plate with a thickness of 10 mm and has a right-angled trapezoidal cross section.

[0071] The cap beam side mold 55, the cap beam bottom mold 56 and the cap beam end mold 92 are rolled from a steel plate with a thickness of 4 mm according to the cross-sectional shape of the cap beam, and a bottom mold limit falcon 57 connected to the bottom mold limit groove 53 is arranged on the lower surface of the cap beam bottom mold 56. The bottom mold limit falcon 57 is rolled from a steel plate with a thickness of 10 mm, and its cross-sectional shape is the same as that of the bottom mold limit groove 53.

[0072] The verticality of the cap beam side form 55 is adjusted by a formwork adjustment bolt 58 disposed between the cap beam side form 55 and the supporting top plate 34. The formwork adjustment bolt 58 includes a screw and a nut with a diameter of 20 mm, and the tightening directions of the screws on both sides of the nut are opposite.

[0073] The fastening pressure bolt 59 is made of a rolled screw with a diameter of 20 mm and is firmly welded to the outer wall of the position control side falcon 54 .

[0074] By tightening the pressure bolt 59, vertical pressure is applied to the top pressure plate 60. The top pressure plate 60 has an "L"-shaped cross section and is made of a 10mm thick steel plate. It is vertically welded to the connecting vertical plate 61. The connecting vertical plate 61 is made of a 10mm thick steel plate and has a right-angle trapezoidal cross section. A fixed angle bottom support 93 and an end vertical support 94 are arranged on the outside of the end mold 92 of the cap beam. The fixed angle bottom support 93 is made of a 10mm thick steel plate, and the inclination angle of the upper surface is the same as the inclination angle of the end mold 92 of the cap beam. The end vertical support 94 is made of a 10mm thick steel plate, and screw holes connected to the end mold control bolt 96 and the bottom support control bolt 97 are preset on the end vertical support 94. A cantilever inner support rib 98 and a corner hanging rib 99 for hoisting and positioning the cap beam reinforcement cage 4 are arranged on the top of the end vertical support 94. The end mold control bolt 96 and the bottom support control bolt 97 are both rolled with a screw with a diameter of 20 mm. The bottom of the fixed angle bottom support 93 is connected to the support top plate 34 through a bottom support slide plate 95, and the bottom support slide plate 95 is rolled with a steel plate with a thickness of 3 mm.

[0075] The steel cage hanger 62 includes a hanger bottom support 63, a hanger hoop plate 64, a sliding support groove 65, a sliding support plate 66 and a lateral alignment body 67, wherein the hanger bottom support 63, the hanger hoop plate 64, the sliding support groove 65 and the sliding support plate 66 are all rolled from a steel plate with a thickness of 10 mm, and the hanger hoop plate 64 is welded on the hanger bottom support 63; the side of the connecting rod 68 is connected to the lateral alignment body 67; a groove with a cross section of an inverted "T" is provided on the sliding support groove 65 for the sliding support plate 66 to slide, and a lateral support pier 70 is provided on the upper surface of the sliding support groove 65; the lateral support pier 70 is rolled from a steel plate with a thickness of 10 mm, and the cross section is a right-angle trapezoid; the lateral alignment body 67 adopts a hydraulic jack, and the two ends are respectively connected to the lateral support pier 70 and the connecting rod 68 Connection; connect the top of the sliding support plate 66 to the connecting hanger 68, which is made of a steel pipe with a diameter of 100 mm; first connect the hanger hoop 64 to the two rows of cap beam longitudinal bars 14 on the upper part of the cap beam reinforcement cage 4, and then hoist the cap beam reinforcement cage 4 to the inside of the cap beam side form 55 and the cap beam end form 69 through external lifting equipment, and then adjust the lateral position of the cap beam reinforcement cage 4 through the lateral positioning body 67; position the cap beam reinforcement cage 4 during the pouring of the cap beam concrete 76 through the cantilever internal support bars 98 and the corner hangers 99 on the end vertical supports 94; the cantilever internal support bars 98 are made of a steel plate with a thickness of 10 mm; the corner hangers 99 are made of a screw with a diameter of 20 mm, and a connecting plate connected to the cap beam longitudinal bars 14 is welded at the bottom.

[0076] The concrete pouring hopper 71 includes a material collection box trough 72, an oblique material distribution pipe 73, a vertical material distribution pipe 74 and a discharge vibrator 75. The material collection box trough 72 is made of a 3mm thick steel plate and is cup-shaped. The bottom end is connected to the vertical material distribution pipe 74 and has a diameter of 200mm. The oblique material distribution pipe 73 is symmetrically arranged in an eight-shaped shape, has a diameter of 200mm, and is 45 degrees to the horizontal plane. The diameter of the oblique material distribution pipe 73 is 5cm higher than that of the vertical material distribution pipe 74. The discharge vibrator 75 is an attached surface vibrator. Vibration loads are applied to the vertical material distribution pipe 74 and the oblique material distribution pipe 73 through the discharge vibrator 75 to pour the cap beam concrete 76.

[0077] After the strength of the cap beam concrete 76 is formed, a suspension hoop 77 is arranged at the end of the cap beam. The suspension hoop 77 is made of rolled steel plate with a thickness of 10 mm. A bottom support connecting rod 78 and a cantilever bottom support 79 are arranged in sequence below the suspension hoop 77. The bottom support connecting rod 78 is made of a steel pipe with a diameter of 100 mm. The cantilever bottom support 79 is made of rolled steel plate with a thickness of 10 mm. A top support connecting rod 80 and a vertical support column 81 are arranged on the upper surface of the suspension hoop 77, and the top support connecting rod 80 and the vertical support column 81 are both rolled from a steel pipe with a diameter of 100 mm; the top support connecting rod 80 is used to fix the cantilever top support 82, and the cantilever top support 82 has a rectangular cross-section and is rolled from a steel plate with a thickness of 10 mm; a top support connecting column 83 is arranged between the cantilever bottom support 79 and the cantilever top support 82, and the top support connecting column 83 is rolled from a steel pipe with a diameter of 100 mm; a suspension rod 84 connected to the cantilever top support 82 is arranged on the vertical support column 81, and the suspension rod 84 adopts a screw with a diameter of 30 mm. An anchor rod 85 and a work support plate 86 are arranged in sequence at the lower part of the cantilever top support 82. The anchor rod 85 is rolled from a screw rod with a diameter of 60 mm. The work support plate 86 is rolled from a steel plate with a thickness of 4 mm. Two rows of adjustment rods 87 are arranged on the upper surface of the work support plate 86. The adjustment rod 87 includes a screw rod and a nut, and the tightening directions of the screw rods on both sides of the nut are opposite. One end is welded and connected to the work support plate 86, and the other end is connected to the jack clamp 88 through a directional ball joint 91. A jack clamp 88 is arranged at the top of the adjustment rod 87. The jack clamp 88 is rolled from a steel plate with a thickness of 10 mm. The prestressed reinforcement 89 is made of a steel strand with a diameter of 30 mm. The prestressed reinforcement 89 is passed along the reinforcement sleeve 20 and through the tensioning jack 90. ​​The tensioning jack 90 is a through-hole jack, and the prestressing prestress is applied to the prestressed reinforcement 89 through the tensioning jack 90.

[0078] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0079] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0080] Although this article uses more professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0081] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present application. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the protection scope of the present application.

Claims

1. A construction method for a large-section prestressed cap beam in an elevated section of urban rail transit, characterized in that: The construction steps include: S00, Bridge Pier Construction: The bridge pier (1) is constructed according to the design and specification requirements, and a built-in anchor plate (2) and an anchor inner pipe (3) are arranged on the top of the bridge pier (1); S10, Cap beam reinforcement cage rotation frame binding: A tire frame support column (6) and a tire frame top beam (7) are sequentially arranged on a tire frame bottom plate (5), and side support plates (8) are respectively arranged at both ends of the tire frame top beam (7); a steering adjustment groove (9) with a central angle of 90 degrees is arranged on the side support plate (8), and a support bolt clamping plate (10) is arranged on the outer side of the steering adjustment groove (9); a bottom support adjustment bolt (11) is arranged on the tire frame top beam (7), and a steel bottom support plate (12) is arranged at the top end of the mutually parallel bottom support adjustment bolts (11), and an arc bottom support falcon (13) is arranged on the upper surface of the steel bottom support plate (12); After the steering side support bolt (16) passes through the steering adjustment groove (9), it is connected to the support bolt connecting groove (18) on the outer side of the longitudinal reinforcement pressure plate (17) through the bolt end connecting plate (19); after the reinforcement binding of the upper and side parts of the cap beam reinforcement cage (4) is completed, the steering side support bolt (16) is rotated ninety degrees along the steering adjustment groove (9) and fixed by the support bolt clamping plate (10), and then the reinforcement binding of the bottom of the cap beam reinforcement cage (4) is carried out; a reinforcement sleeve (20) is passed through the interior of the cap beam reinforcement cage (4), and a special-shaped anchor plate (21) is arranged at the end of the reinforcement sleeve (20); and pressure dispersion piers (22) with a right-angle trapezoidal cross section are arranged at both ends of the special-shaped anchor plate (21); Wherein, the cap beam reinforcement cage (4) comprises cap beam longitudinal reinforcement (14) and cap beam stirrups (15); S20, combined support system layout: The rigid sand box (23) comprises a sand box bottom plate (24), a sand box top plate (25), a sand box outer tube (26) and a sand box inner tube (27). The sand box inner tube (27) is in the shape of an inverted cup mouth, and concrete is poured inside to form a rigid casting body (28). A dense water pipe (29) is arranged inside the rigid casting body (28). A lower row of clamps (30) and an upper row of clamps (31) are sequentially arranged on the upper part of the bridge pier (1) from bottom to top, and a lower row of angle braces (32) are arranged on the outer side of the lower row of clamps (30), and an embedded steel bar (33) is arranged on the outer side of the upper row of clamps (31); the angle brace embedded steel bars (35) on the side of the supporting top plate (34) are embedded in the connecting groove formed by the embedded steel bar (33) and the upper row of clamps (31), and a connecting vertical brace (36) is arranged between the supporting top plate (34) and the lower row of angle braces (32); a supporting column (37) is arranged outside the bridge pier (1), and a rigid sand box (23) is arranged at the top of the supporting column (37); According to the bottom elevation requirement of the supporting longitudinal beam (38), the height of the sand box top plate (25) is adjusted, and then water is injected into the sand box through the compact water pipe (29); the supporting longitudinal beam (38) is arranged on the upper surface of the rigid sand box (23) and the supporting top plate (34), and the connecting tie beam (40) and the supporting top plate (34) are sequentially arranged on the upper part of the supporting longitudinal beam (38); S30, preloading of combined support system: A suspension rod top beam (42) is arranged on the supporting top plate (34), and a water tank suspension rod (43) and a hanging water tank (44) are arranged in sequence at the lower part of the suspension rod top beam (42); a connecting bar hoop (45) is arranged on the steel bar protruding section at the top of the pier (1), and a hoop connecting bar (46) is arranged between adjacent connecting bar hoop (45); and a counter-pressure connecting plate (47) is welded on the outer side of the connecting bar hoop (45) parallel to the short side direction of the pier (1); An arched inner support (48) is arranged between the mirror-image-opposite connecting reinforcement hoops (45), one end of the stabilizing pull bolt (100) is first connected to the anchor inner tube (3), and the other end is passed through the arched inner support (48) and then an arc-shaped pressure plate (49) is arranged, and is fastened by a stabilizing pressure bolt (50); a counter-pressure support plate (51) is arranged on the outer side of the counter-pressure connecting plate (47), and a counter-pressure bolt (52) is arranged between the counter-pressure support plate (51) and the supporting top plate (34); water is supplied to the hanging water tank (44) through an external water supply device, and a tightening pressure is applied through the counter-pressure bolt (52), and the supporting top plate (34) and the supporting system below it are simultaneously pre-pressed; S40, cap beam formwork support: Remove the hanging water tank (44), the stabilizing pressure bolt (50), the connecting reinforcement hoop (45), the counter-pressure support plate (51), the arched inner support (48) and the counter-pressure bolt (52) on the combined support system; A bottom mold limiting groove (53) and a position-controlling side mold (54) with a right-angle trapezoidal cross section are arranged on the upper surface of the supporting top plate (34); the cap beam side mold (55) is tightly connected to the cap beam bottom mold (56) in advance, and a bottom mold limiting mold (57) connected to the bottom mold limiting groove (53) is arranged on the lower surface of the cap beam bottom mold (56); First, the cap beam side form (55), the cap beam bottom form (56) and the cap beam end form (92) are hoisted onto the supporting top plate (34) by using external hoisting equipment, and the bottom form limiter (57) is connected to the bottom form limiter groove (53), and then the verticality of the cap beam side form (55) is adjusted by using the form adjustment bolt (58) arranged between the cap beam side form (55) and the supporting top plate (34), and the vertical pressure is applied to the top pressure plate (60) by tightening the pressure bolt (59) to control the position of the cap beam side form (55); a fixed angle bottom support (93) and an end vertical support (94) are arranged on the outer side of the cap beam end form (92), and the bottom of the fixed angle bottom support (93) is connected to the supporting top plate (34) through the bottom support slide plate (95); A lateral position-controlling thrust is applied to the cap beam end mold (92) and the fixed angle bottom support (93) through the end mold position-controlling bolt (96) and the bottom support position-controlling bolt (97) on the end vertical support (94); S50, Lifting of Cap Beam Steel Cage: The steel cage hanger (62) comprises a hanger bottom support (63), a hanger hoop plate (64), a sliding support groove (65), a sliding support plate (66) and a lateral alignment body (67), and the top end of the sliding support plate (66) is connected to a connecting hanger rod (68), the sliding support plate (66) is embedded in the sliding support groove (65), and the hanger hoop plate (64) is welded on the hanger bottom support (63); the side of the connecting hanger rod (68) is connected to the lateral alignment body (67); First, the hanger hoop plate (64) is connected to the two rows of cap beam longitudinal bars (14) on the upper part of the cap beam reinforcement cage (4), and then the cap beam reinforcement cage (4) is hoisted to the inside of the cap beam side form (55) and the cap beam end form (69) by external hoisting equipment, and then the lateral position of the cap beam reinforcement cage (4) is adjusted by the lateral positioning body (67); the cap beam reinforcement cage (4) is positioned during the pouring of the cap beam concrete (76) by the cantilever internal support bars (98) and the corner hanging bars (99) on the end vertical support (94); S60, cap beam concrete pouring: The concrete pouring hopper (71) comprises a material collecting box trough (72), an oblique material distribution pipe (73), a vertical material distribution pipe (74) and a discharge vibrator (75); An external concrete pouring device is used to pour concrete into the aggregate tank trough (72), and concrete pouring construction is carried out simultaneously through the vertical distribution pipe (74) and the oblique distribution pipe (73), and a vibration load is applied to the vertical distribution pipe (74) and the oblique distribution pipe (73) through a discharge vibrator (75) to pour the cap beam concrete (76); S70, prestressed tendon tensioning: After the strength of the cap beam concrete (76) is formed, a suspension hoop (77) is arranged at the end of the cap beam, and a bottom support connecting rod (78) and a cantilever bottom support (79) are arranged in sequence below the suspension hoop (77), and a top support connecting rod (80) and a vertical support column (81) are arranged on the upper surface of the suspension hoop (77), and the cantilever top support (82) is fixed by the top support connecting rod (80); A top support connecting column (83) is arranged between the cantilever bottom support (79) and the cantilever top support (82); a cantilever suspension rod (84) connected to the cantilever top support (82) is arranged on the vertical support column (81); an anchor suspension rod (85) and an operation support plate (86) are arranged in sequence at the lower part of the cantilever top support (82), and a plurality of rows of adjustment support rods (87) are arranged on the upper surface of the operation support plate (86), and a jack hoop (88) is arranged at the top end of the adjustment support rod (87); The prestressed reinforcing bar (89) is passed along the reinforcing bar sleeve (20) and through the tensioning jack (90); the tensioning jack (90) is first firmly connected to the jack clamp (88), and then the axis position of the tensioning jack (90) is adjusted by adjusting the support rod (87), and then the prestressed reinforcing bar (89) is applied with tensioning prestress through the tensioning jack (90).

2. The method for constructing a large-section prestressed cap beam in an elevated section of urban rail transit according to claim 1, characterized in that: In step S00, the anchor inner tube (3) is formed by rolling a spiral tube and is vertically welded to the built-in anchor plate (2).

3. The method for constructing a large-section prestressed cap beam in an elevated section of urban rail transit according to claim 1, characterized in that: In step S10, the arc-shaped bottom support (13) is made of rolled steel plate, with a central angle of ninety degrees, and the spacing of the arc-shaped bottom support (13) is the same as the spacing of the cap beam longitudinal reinforcement (14) of the cap beam reinforcement cage (4); the support bolt connecting groove (18) includes two steel plates with "L"-shaped cross sections, which are arranged in mirror symmetry; the bolt end connecting plate (19) is made of rolled steel plate and is vertically welded to the steering side support bolt (16).

4. The method for constructing a large-section prestressed cap beam in an elevated section of urban rail transit according to claim 1, characterized in that: In step S20, the embedded rib (33) is made of rolled steel plate, and is enclosed with the upper row of clamps (31) to form a connecting groove with a right-angled trapezoidal cross section; the connecting vertical support (36) includes a screw and a nut, and the tightening directions of the screws at both ends of the nut are opposite; the sand box outer tube (26) and the sand box inner tube (27) are both made of rolled steel plate, and a sand discharge pipe (41) is arranged at the bottom of the sand box outer tube (26), and the inner diameter of the sand box outer tube (26) is 0.5 to 1 cm larger than the outer diameter of the bottom of the sand box inner tube (27).

5. The method for constructing a large-section prestressed cap beam in an elevated section of urban rail transit according to claim 1, characterized in that: In step S30, the arched inner support (48) is made of rolled steel plate, and its two ends are welded to the connected connecting rib hoop (45), and a hole is set in the middle for the stabilizing pressure bolt (50) to pass through; the arc pressure plate (49) is made of rolled steel plate, and its lower surface is set with a curved surface with the same curvature as the arched inner support (48); the hoop connecting rib (46) is made of rolled steel plate, and its two ends are welded to the connected hoop connecting rib (46).

6. The method for constructing a large-section prestressed cap beam in an elevated section of urban rail transit according to claim 1, characterized in that: In step S40, the cross section of the control side mold (54) is a right-angle trapezoid, and a fastening pressure bolt (59) connected to the top pressure plate (60) is arranged on the control side mold (54); the top pressure plate (60) is made of rolled steel plate, and has an "L"-shaped cross section. A connecting vertical plate (61) with a right-angle trapezoidal cross section is arranged at the insertion section of the top pressure plate (60), and a hole for the fastening pressure bolt (59) to pass through is arranged on the top plate; the cap beam side mold (55) is made of rolled steel plate, and a side mold connecting mold is arranged on the outer side of the cap beam side mold (55); the template adjustment bolt (58) includes a nut and a screw, and the screws on both sides of the nut are tightened in opposite directions so that the template adjustment bolt (58) The two ends are connected to the cap beam side mold (55) and the supporting top plate (34) through bolt-end ball joints (101); the cap beam end mold (92) is made of rolled steel plate, and a hole for the special-shaped anchor plate (21) to pass through is preset on the cap beam end mold; the fixed angle bottom support (93) is made of rolled steel plate, and the inclination angle of the upper surface is the same as the inclination angle of the cap beam end mold (92); the end vertical support (94) is made of rolled steel plate, and screw holes connected to the end mold control bolts (96) and the bottom support control bolts (97) are preset on the end vertical support (94), and cantilever inner support bars (98) and corner hanging bars (99) for hoisting and positioning the cap beam reinforcement cage (4) are arranged on the top of the end vertical support (94).

7. The method for constructing a large-section prestressed cap beam in an elevated section of urban rail transit according to claim 1, characterized in that: In step S50, the sliding support groove (65) is formed by rolling steel plates, and a groove with an inverted "T" cross-section for the sliding support plate (66) to slide is set on the sliding support groove (65), and a lateral support pier (70) is set on the upper surface of the sliding support groove (65); the hanger hoop plate (64) is formed by rolling steel plates, has a semicircular cross-section, and an inner diameter that is the same as the outer diameter of the cap beam longitudinal reinforcement (14), and is welded to the hanger bottom support (63); the lateral positioning body (67) uses a hydraulic jack, and its two ends are respectively connected to the lateral support pier (70) and the connecting hanger rod (68).

8. The method for constructing a large-section prestressed cap beam in an elevated section of urban rail transit according to claim 1, characterized in that: In step S60, the collecting box trough (72) is made of rolled steel plate and is cup-shaped, with the bottom end connected to the vertical distribution pipe (74) and the side wall connected to the oblique distribution pipe (73); the discharge vibrator (75) is an attached surface vibrator; the vertical distribution pipe (74) and the oblique distribution pipe (73) are steel pipes with a thickness of 0.2 to 0.4 mm.

9. The method for constructing a large-section prestressed cap beam in an elevated section of urban rail transit according to claim 1, characterized in that: In step S70, the adjusting support rod (87) includes a nut and a screw, and the screws on both sides of the nut are tightened in opposite directions, one end is welded to the working support plate (86), and the other end is connected to the jack hoop (88) through an adjusting ball joint (91).

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