An asynchronous construction method of a bridge pylon and a beam thereon

Abstract

The application relates to an asynchronous construction method for a bridge cable tower and an upper beam thereon, which comprises the following steps: S1, embedding a plurality of connecting units on the inner side of a tower column of the cable tower when the tower column is constructed to the position of the upper beam, which are used for connecting a plurality of triangular support brackets below the upper beam; S2, arranging a plurality of connecting sleeves and reserved pipeline holes on the inner side of the tower column and at the position corresponding to the upper beam; S3, after the construction of the tower column is completed, the triangular support brackets comprise two upper and lower corbel supports, and each corbel support is connected with one connecting unit; S4, connecting the main reinforcement in the upper beam with the connecting sleeves, and then binding the main reinforcement and the remaining reinforcement of the upper beam; connecting the prestressed pipeline in the upper beam with the reserved pipeline holes; S5, pouring the first batch of concrete of the upper beam, carrying out tensioning after curing, pouring the second batch of concrete after strength qualification, and carrying out tensioning and grouting after curing; and finally, removing the triangular support brackets.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of the construction of the upper beam of the cable tower of a suspension bridge, and particularly relates to an asynchronous construction method for a bridge cable tower and the upper beam thereof. BACKGROUND

[0002] For a portal-shaped cable tower of a suspension bridge, an upper beam needs to be built between the two tower columns of the same cable tower. The upper beam is located at the upper part of the cable tower and is a full prestressed concrete structure, and the tower column is a common reinforced concrete structure. At present, the cable tower and the upper beam are constructed by using a synchronous method, that is, when the cable tower is constructed to the upper beam segment, the steel reinforcement and the formwork support system of the cable tower and the steel reinforcement and the formwork support system of the upper beam are simultaneously set up, simultaneously constructed, and finally the whole concrete of the cable tower and the upper beam at this segment is poured at one time. Because the upper beam has a large cross-sectional size, a large span, and a large load, a heavy landing steel pipe support is generally set up from the tower bottom as the support system of the formwork of the upper beam. After the support system is set up, the formwork, the steel reinforcement, and the concrete of the cable tower and the upper beam at this segment are constructed, and after the concrete is cured to the required strength, the prestress of the upper beam is tensioned in batches at one time, so that the construction of the cable tower and the upper beam at this segment is completed.

[0003] The above-mentioned synchronous construction method has the following problems: (1) when the synchronous construction is performed, the inside of the hydraulic climbing formwork of the tower column needs to be holed at the position of the upper beam according to the cross-sectional size of the upper beam, and needs to be structurally connected with the bottom formwork and the side formwork of the upper beam, so that when the tower column is constructed above the upper beam, the inside part of the formwork of the hydraulic climbing formwork needs to be reprocessed and put into use or be reformed, which increases the construction cost and the reform construction period; (2) the upper beam belongs to an oversize system concrete structure, and is generally poured at one time in the full height range. Because the load is too large, a powerful support system structure is needed, and the high rigidity and stability requirements lead to a large cost, increase the difficulty of the pouring construction organization of the mass concrete, and also increase the cost of the temperature control measures of the mass concrete and the risk of cracks; (3) a super-high steel pipe support system needs to be set up from the tower bottom as the formwork support frame of the upper beam, which brings the problems of a large amount of steel pipe support frame, a long construction period of the set-up, a large amount of welding installation personnel, a high labor intensity, and a large safety risk. SUMMARY

[0004] In view of the above-mentioned problems, the present application provides an asynchronous construction method for a bridge cable tower and the upper beam thereof, which comprises the following steps:

[0005] S1: when the tower column of the cable tower is constructed to the upper beam segment, a plurality of connection units are pre-buried on the inside surface of the tower column while the steel reinforcement of the tower column is bound, and are used to correspondingly connect a plurality of triangular support brackets below the upper beam;

[0006] S2: a plurality of connecting sleeves and a plurality of reserved pipeline holes are arranged on the inner side of the tower column and correspond to the position of the upper cross beam, the connecting sleeves are used to connect the main reinforcement corresponding to the upper cross beam, and the reserved pipeline holes are used to connect the prestressed pipeline corresponding to the upper cross beam;

[0007] S3: after the tower column construction is completed, the triangular support bracket includes upper and lower corbel supports, each corbel support is connected with a connecting unit, and the installation of the triangular support bracket is completed;

[0008] S4: the main reinforcement in the upper cross beam is connected with the connecting sleeve, and then the main reinforcement and the remaining reinforcement of the upper cross beam are bound; the prestressed pipeline in the upper cross beam is connected with the reserved pipeline hole;

[0009] S5: the first batch of concrete pouring of the upper cross beam is carried out, after the curing of the first batch of poured concrete is qualified, the first batch of prestressed beam tensioning is carried out, after the strength requirement is reached, the second batch of concrete pouring is continued, after the curing of the second batch of poured concrete is qualified, the second batch of prestressed beam tensioning and grouting are carried out; finally, the triangular support bracket is removed.

[0010] The asynchronous construction method provided by the application, when the tower column construction reaches the upper cross beam section, the tower column continues to be constructed by the hydraulic climbing formwork, meanwhile, the connecting units corresponding to the triangular support bracket are pre-buried, the connecting sleeves and the reserved pipeline holes corresponding to the upper cross beam are pre-buried, the hydraulic climbing formwork is removed after the tower column construction is completed, the upper and lower corbel supports of the triangular support bracket are connected with the connecting units and installed according to the design position, the triangular support system is completed, and the load of the upper cross beam and the triangular support bracket is borne by the tower column. Then, the main reinforcement of the upper cross beam is connected and installed on the connecting sleeve, the main reinforcement and other reinforcement are bound, the prestressed pipeline of the upper cross beam is connected and installed in the reserved pipeline hole, and the longitudinal prestress construction of the upper cross beam is realized. Finally, the concrete of the upper cross beam is poured in two batches, half height is poured each time, and step-by-step curing, tensioning and the like are carried out, and the construction of the upper cross beam is completed.

[0011] Optionally, in step S1, the portal-shaped cable tower includes two opposite tower columns, the side faces of the tower columns facing each other are inner side faces of the tower columns, and the plurality of triangular support brackets are evenly arranged in the width direction of the upper cross beam.

[0012] Optionally, the triangular support bracket includes a horizontal rod, a first inclined rod and a second inclined rod, one end of the horizontal rod is provided with a first corbel support, the other end is connected with the top end of the first inclined rod, and the bottom end of the first inclined rod is provided with a second corbel support; the top end of the second inclined rod is connected with the position of the horizontal rod close to the first corbel support, and the bottom end is connected with the middle part of the first inclined rod, so that the horizontal rod, the second inclined rod and the middle upper part of the first inclined rod form a triangle.

[0013] Optionally, the connecting unit comprises, in sequence, a bracket, an anchor plate, and a plurality of screw rods, the screw rods are embedded in the inner side of the tower column, the anchor plate is laid on the surface of the inner side of the tower column, the plurality of screw rods are uniformly distributed along the height and width of the anchor plate, and the screw rod heads are fixedly connected with the anchor plate through climbing cones and bolts.

[0014] The bracket is fixedly connected with the outer side of the anchor plate, the top of the bracket is provided with two symmetrically arranged bracket ear plates, and the bracket is connected with the bracket support through the bracket ear plates.

[0015] Optionally, in step S3, the bracket support comprises a hollow support frame, a reinforcing plate, and a pin shaft, the support frame is inserted between the two bracket ear plates, the inner and outer sides of the two sides of the support frame facing the bracket ear plates are each provided with a reinforcing plate parallel to the bracket ear plates, the middle parts of the support frame, the reinforcing plate, and the bracket ear plate are each provided with a through hole corresponding to each other, and the pin shaft penetrates the support frame from one side of the bracket ear plate and then penetrates the other side of the bracket ear plate, so that the bracket support is fixedly connected with the connecting unit.

[0016] Optionally, in step S2, the main reinforcement and the prestressed pipe of the upper cross beam are parallel to the length direction of the upper cross beam, the connecting sleeve is a straight thread connecting sleeve, and the reserved pipe hole is a pipe opening of a plastic pipe or a metal pipe embedded in the tower column. The main reinforcement, the prestressed pipe, and other steel bars of the upper cross beam are arranged in the same manner as in the prior art.

[0017] Optionally, after step S3, the method further comprises: sequentially installing, from bottom to top, a tripping block, a bearing beam, a Bailey, and a No. 22 I-shaped distribution beam above the triangular support bracket as a support foundation for the construction of the upper cross beam; the top surface of the support foundation is wider than the width of the upper cross beam, and a guardrail is installed on the free side of the support foundation as a construction operation platform of the upper cross beam.

[0018] Further optionally, the bearing beam is in the direction of the bridge, that is, the bearing beam is perpendicular to the upper cross beam, and a plurality of bearing beams are uniformly arranged along the length direction of the upper cross beam.

[0019] Further optionally, the No. 22 I-shaped distribution beam is parallel to the width direction of the upper cross beam, a plurality of No. 22 I-shaped distribution beams are uniformly arranged along the length direction of the upper cross beam, and correspond to the support nodes of the Bailey.

[0020] Further optionally, a square wood and a Wisa plate are sequentially arranged above the No. 22 I-shaped distribution beam as a construction base mold of the upper cross beam.

[0021] The upper cross beam of the application adopts twice pouring, tension of the first batch of prestressed beam, improves the tensile and bending resistance of the upper cross beam itself, provides certain bearing capacity for the lower concrete load of the second pouring, shares the upper cross beam reinforced concrete and construction load with the support system below the upper cross beam, effectively reduces the load of the second pouring borne by the support system below the upper cross beam, provides greater safety reserve for the stress of the support system, and also provides conditions for optimizing and reducing the structural strength and investment of the support system.

[0022] In step S2, if the traditional construction method is adopted, the connecting sleeve and the pipe for forming the reserved pipe hole are installed in the steel reinforcement frame of the tower column in advance, that is, they are fixed in the climbing formwork of the tower column, and after the formwork is installed, the openings of the connecting sleeve and the pipe towards the upper cross beam direction are in direct contact with the side surface of the formwork. When pouring concrete to form the tower column, part of the concrete will inevitably flow to the position between the formwork and the pipe opening of the connecting sleeve and the pipe, causing part of the concrete to flow into the connecting sleeve and the pipe. The connecting sleeve is a straight threaded connecting sleeve, and the pipe opening is provided with a thread for connecting the main reinforcement of the upper cross beam. If the pipe opening thread of the connecting sleeve is contaminated with concrete, after the tower column is cured and the formwork is removed, the cement at the pipe opening thread has also been hardened, which is difficult to clean, seriously affecting the threaded connection with the main reinforcement of the upper cross beam. The pipe opening of the pipe for forming the reserved pipe hole also faces the same problem, affecting the connection with the upper cross beam prestressed pipe.

[0023] To solve the above problems, in step S2, the following steps are included:

[0024] (1) When the steel reinforcement net frame of the tower column is erected, a plurality of connecting sleeves and a plurality of pipes are arranged in the steel reinforcement net frame of the tower column, and correspond to the positions of the main reinforcement of the upper cross beam and the positions of the prestressed pipes respectively;

[0025] The end of the connecting sleeve towards the tower column is closed, and the end towards the upper cross beam is provided with an internal thread, and is connected with a threaded sleeve cover, and the outer diameter of the sleeve cover is equal to the outer diameter of the connecting sleeve;

[0026] The end of the pipe towards the tower column is closed, and the end towards the upper cross beam has an opening, that is, the pipe opening of the pipe, and the pipe opening of the pipe protrudes from the inner side surface of the tower column;

[0027] (2) The climbing formwork of the tower column corresponding to the position of the upper cross beam is made, the first recess part corresponding to the position of the connecting sleeve is provided, the second recess part corresponding to the position of the pipe is provided, the first recess part and the second recess part are protruded towards the upper cross beam direction, and are used for accommodating the sleeve cover and the pipe opening of the pipe respectively;

[0028] (3) the formwork made in step (2) is installed outside the tower column reinforcement net frame, the sleeve cover extends into the first recess and the end thereof abuts against the vertical inner wall surface of the first recess, and the pipe opening of the pipe extends into the second recess and the end thereof abuts against the vertical inner wall surface of the second recess;

[0029] (4) the foam plastic is filled between the side surface of the sleeve cover and the inner side surface of the first recess and between the side surface of the pipe opening and the inner side surface of the second recess, so as to avoid the concrete entering the gap of the recess during pouring of the concrete and further fix the position of the connecting sleeve and the pipe.

[0030] The application abandons the traditional pre-burying method, seals and protects the open end of the connecting sleeve and the pipe opening of the pipe, covers the open end of the connecting sleeve with the sleeve cover, and adopts the protruding form, so that the open end of the connecting sleeve and the pipe are away from the inside of the tower column and are not affected by the pouring of the concrete of the tower column, which completely overturns the existing formwork opening method and avoids the concrete leakage. The recess on the climbing formwork provides the accommodation space for the open end of the connecting sleeve and the pipe and prevents the concrete leakage, and the shielding effect of the recess and the filled foam plastic greatly reduce the influence of the pouring of the concrete on the open end of the connecting sleeve and the pipe. After the formwork is removed, only the residual foam plastic is removed and a small amount of cement is repaired.

[0031] In step S5, the upper cross beam is poured in two times, which may cause the connection problem between the upper layer and the lower layer and affect the strength of the upper cross beam. In step S4, the connecting structure is uniformly arranged in the inside of the reinforcement of the upper cross beam during the reinforcement binding of the upper cross beam, the connecting structure comprises a first end plate, a second end plate, a plurality of inner connecting bars and a plurality of outer connecting bars, the first end plate and the second end plate are the same in structure and are arranged in an up-down mode, the first end plate is in the inside of the upper layer of concrete, and the second end plate is in the inside of the lower layer of concrete; the inner connecting bars are connected between the first end plate and the second end plate, the outer connecting bars are arranged above the first end plate and below the second end plate, and are used for connecting other reinforcements of the upper cross beam.

[0032] Further, the first end plate is a circular ring, a first through hole is arranged in the center of the first end plate, a plurality of tension holes are arranged on the plate surface of the first end plate and are uniformly arranged along the circumference of the first end plate.

[0033] The second end plate is a circular ring, a second through hole is arranged in the center of the second end plate, a plurality of tension holes are arranged on the plate surface of the second end plate and are uniformly arranged along the circumference of the second end plate.

[0034] Optionally, the inner connecting bar has abutments at both its upper and lower ends. The two ends of the inner connecting bar first pass through the large holes of the tensioning holes in the first end plate and the second end plate, respectively. The first end plate and the second end plate rotate horizontally, so that the inner connecting bar enters the small hole of the tensioning hole. The abutment at the bottom of the inner connecting bar is located on the lower surface of the second end plate, and the abutment at the top of the inner connecting bar is located on the upper surface of the first end plate, so that the inner connecting bar is engaged between the first end plate and the second end plate.

[0035] Further optionally, one end of the outer connecting bar is provided with a pier. After the inner connecting bar is installed between the first end plate and the second end plate, the top of the outer connecting bar connected to the first end plate is provided with a pier. The outer connecting bar passes through the large hole of the tensioning hole in the first end plate from top to bottom, and the bottom of the outer connecting bar is connected to the reinforcing bar.

[0036] The bottom of the outer connecting bar connecting the second end plate is provided with a pier. The outer connecting bar passes through the large hole of the tensioning hole of the second end plate from bottom to top, and the top of the outer connecting bar is connected to the steel bar. Attached Figure Description

[0037] Figure 1 A structural schematic diagram of the tower column, upper crossbeam, and triangular support bracket;

[0038] Figure 2 This is a schematic diagram of the cross-section of the upper beam;

[0039] Figure 3 This is a schematic diagram of the upper crossbeam, the triangular support bracket, and the support system between them;

[0040] Figure 4 for Figure 3 Enlarged view of the circled area;

[0041] Figure 5 This is a schematic diagram of a corbel support.

[0042] Figure 6 This is a schematic diagram of a triangular support bracket and its supporting system.

[0043] Figure 7 A schematic diagram of the pre-embedded connection between the sleeve and the pipe fitting;

[0044] Figure 8 This is a schematic diagram of the connection structure;

[0045] Figure 9 This is a schematic diagram of a partition.

[0046] In the drawings, 1-tower column, 2-upper cross beam, 3-triangle support bracket, 4-connection sleeve, 5-pipe fitting, 6-corbel support, 7-connection unit, 8-horizontal rod, 9-first inclined rod, 10-second inclined rod, 11-corbel, 12-anchor plate, 13-screw rod, 14-corbel ear plate, 15-climbing cone, 16-bolt, 17-branch frame, 18-stiffening plate, 19-pivot, 20-falling block, 21-bearing beam, 22-Bailey, 23-22# I-shaped distribution beam, 24-square timber, 25-Wisa plate, 26-lower layer of concrete, 27-upper layer of concrete, 28-sleeve cover, 29-connection structure, 30-first end plate, 31-second end plate, 32-internal connection bar, 33-external connection bar, 34-steel column, 35-separation plate, 36-horizontal connection plate, 37-corrugated plate, 38-guard plate. DETAILED DESCRIPTION

[0047] The embodiment provides an asynchronous construction method for a bridge cable tower and an upper cross beam thereof, as shown in the drawings, comprising the following steps: Figures 1-7

[0048] S1: when the tower column 1 of the cable tower is constructed to the section of the upper cross beam 2, a plurality of connection units 7 are pre-buried on the inner side of the tower column 1 while the steel bars of the tower column 1 are bound, and the connection units 7 are used for corresponding connection of a plurality of triangle support brackets 3 below the upper cross beam 2;

[0049] S2: a plurality of connection sleeves 4 and a plurality of reserved pipe holes are arranged on the inner side of the tower column 1 and at the position corresponding to the upper cross beam 2, the connection sleeves 4 are used for corresponding connection of the main reinforcement of the upper cross beam 2, and the reserved pipe holes are used for corresponding connection of the prestressed pipes of the upper cross beam 2;

[0050] S3: after the tower column 1 is constructed, the triangle support bracket 3 comprises two upper and lower corbel supports 6, each corbel support 6 is connected with a connection unit 7, and the installation of the triangle support bracket 3 is completed;

[0051] S4: the main reinforcement in the upper cross beam 2 is connected with the connection sleeve 4, and then the binding of the main reinforcement and the remaining steel bars of the upper cross beam 2 is performed; the prestressed pipes in the upper cross beam 2 are connected with the reserved pipe holes;

[0052] S5: the first batch of concrete pouring of the upper cross beam 2 is performed, after the first batch of poured concrete is cured and qualified, the first batch of prestressed beam tensioning is performed, after the strength requirement is reached, the second batch of concrete pouring is continuously performed, after the second batch of poured concrete is cured and qualified, the second batch of prestressed beam tensioning and grouting are performed, and finally the triangle support bracket 3 is removed.

[0053] ​Optionally, in step S1, the gate-shaped cable tower includes two opposite tower columns 1, the side of the tower column 1 facing each other is the inner side of the tower column 1, the inner side of the single-limb tower column 1 is provided with two rows of connecting units 7, each row is provided with 6-8 connecting units 7 and has the same horizontal height, and is used for corresponding connection of a plurality of triangular support brackets 3, and the plurality of triangular support brackets 3 are evenly arranged in the width direction of the upper cross beam 2.

[0054] Optionally, the triangular support bracket 3 includes a horizontal rod 8, a first inclined rod 9 and a second inclined rod 10, one end of the horizontal rod 8 is provided with a first corbel support, the other end is connected to the top end of the first inclined rod 9, and the bottom end of the first inclined rod 9 is provided with a second corbel support; the top end of the second inclined rod 10 is connected to the position close to the first corbel support of the horizontal rod 8, and the bottom end is connected to the middle part of the first inclined rod 9, so that the horizontal rod 8, the second inclined rod 10 and the middle part of the first inclined rod 9 form a triangle. The triangular support bracket 3 is made of double-spliced HN600*200 profile steel.

[0055] Optionally, the connecting unit 7 sequentially includes a corbel 11, an anchor plate 12 and a plurality of screw rods 13, the screw rod 13 is pre-buried in the inner side of the tower column 1, the anchor plate 12 is laid on the surface of the inner side of the tower column 1, the plurality of screw rods 13 are evenly distributed along the height and width direction of the anchor plate 12, and the head of the screw rod 13 is fixedly connected with the anchor plate 12 through a climbing cone 15 and a bolt 16.

[0056] The end of the corbel 11 is fixedly connected with the outer side of the anchor plate 12, and the top of the corbel 11 is provided with two symmetrically arranged corbel ear plates 14, and the corbel 11 is connected with the corbel support 6 through the corbel ear plate 14.

[0057] A plurality of vertical reinforcing ribs can be arranged on the corbel ear plate 14 to improve the strength thereof. Since the horizontal rod 8 and the first inclined rod 9 of the triangular support bracket 3 have different angles with the inner side of the tower column 1, the butt joint angle of the corbel ear plate 14 of the corbel support 6 and the connecting unit 7 is different, the size of the triangular support bracket 3 and the actual installation position of the connecting unit 7 are measured after the triangular support bracket 3 is processed, the corbel ear plate 14 is welded to the corbel 11, the corbel ear plate 14 is welded by cutting, and the height of the weld is not less than 14 mm. The bolt 16 is a M30-10.9 high-strength bolt 16, and is tightened by a fixed-torque electric tightening wrench.

[0058] Further optionally, the climbing cone 15 is pre-buried in the inner side of the tower column 1 and is sleeved on the head of the screw rod 13, the climbing cone 15 and the bolt 16 are respectively arranged on the two sides of the anchor plate 12 and are connected with each other by penetrating through the through hole on the anchor plate 12, are used for fixing the anchor plate 12 on the inner side of the tower column 1, the inner side of the anchor plate 12 faces the tower column 1, and the outer side of the anchor plate 12 faces the triangular support bracket 3.

[0059] Optionally, in step S3, the bracket 6 comprises a hollow support frame 17, a reinforcing plate 18 and a pin shaft 19, the support frame 17 is inserted between the two bracket lugs 14, the support frame 17 is provided with a reinforcing plate 18 parallel to the inner and outer sides of the two sides of the bracket lug 14, the middle parts of the support frame 17, the reinforcing plate 18 and the bracket lug 14 are provided with through holes corresponding to each other, the pin shaft 19 penetrates the support frame 17 from one side of the bracket lug 14, and then penetrates the other side of the bracket lug 14, so as to fix and connect the bracket 6 and the connecting unit 7. The pin shaft 19 is made of 40Cr steel.

[0060] Optionally, in step S2, the main reinforcement and the prestressed pipe of the upper cross beam 2 are parallel to the length direction of the upper cross beam 2, the connecting sleeve 4 is a straight thread connecting sleeve 4, and the reserved pipe hole is the pipe opening of the plastic pipe or metal pipe embedded in the tower column 1.

[0061] In step S3, the triangular support bracket 3 is hoisted by using a tower crane and a steel wire rope, after hoisting in place, the first bracket is installed first, and then the second bracket is installed.

[0062] Optionally, after step S3, it further comprises: sequentially installing the unloading block 20, the bearing beam 21, the Bailey 22 and the No. 23 I-shaped distribution beam 23 from bottom to top above the triangular support bracket 3, as a support foundation for the construction of the upper cross beam 2; the top surface width of the support foundation is greater than the width of the upper cross beam 2, and a guardrail is installed on the free side of the support foundation as a construction operation platform of the upper cross beam 2.

[0063] Further optionally, the direction of the bearing beam 21 is the along-bridge direction, that is, the bearing beam 21 is perpendicular to the upper cross beam 2, and a plurality of bearing beams 21 are evenly arranged along the length direction of the upper cross beam 2. The bearing beam 21 adopts double-spliced HN600*200 steel.

[0064] Further optionally, when the Bailey 22 is hoisted, a plurality of groups of Baileys 22 are arranged along the width direction and the length direction of the upper cross beam 2 respectively, one group of Baileys 22 is assembled at a time, and each group of Baileys 22 comprises a plurality of Bailey pieces parallel to each other; each group of Baileys 22 is connected by a scissors support;

[0065] When the Bailey 22 is installed, the node of the Bailey 22 is placed on the bearing beam 21, after the Baileys 22 are all installed in place, a channel steel is arranged at the support point of the Bailey 22 on the bearing beam 21 to reinforce the Bailey 22, the channel steel is in the shape of a door and is clamped and welded on the bearing beam 21 as a counter-pressure limiting device to prevent the Bailey 22 from moving forward and backward, the channel steel abuts against the chord of the Bailey 22 from top to bottom, and the channel steel is fixed on the Bailey 22 by using a wire.

[0066] Further, the 22# H-shaped distribution beam 23 is parallel to the width direction of the upper cross beam 2, a plurality of 22# H-shaped distribution beams 23 are uniformly arranged along the length direction of the upper cross beam 2, and correspond to the support nodes of the bailey 22.

[0067] After the installation of the 22# H-shaped distribution beam 23 is completed, the guardrail on the free side is installed first, and the space outside the range of the upper cross beam 2 is a construction operation platform, and the operation platform is fully paved with 5cm thick wooden boards or special steel treads, and the thick wooden boards or steel treads are tightly bound with the 22# H-shaped distribution beam 23 by iron wires.

[0068] Further, the 22# H-shaped distribution beam 23 is parallel to the width direction of the upper cross beam 2, a plurality of 22# H-shaped distribution beams 23 are uniformly arranged along the length direction of the upper cross beam 2, and correspond to the support nodes of the bailey 22.

[0069] Optionally, in step S5, side formworks are arranged on the side of the construction bottom mold of the upper cross beam 2, and then the first batch of concrete is poured to form the lower layer of concrete 26, after the strength of the lower layer of concrete 26 reaches 90% of the design strength, the first batch of prestressed tendons is tensioned, and the reserved pipe holes of the lower layer of concrete 26 are grouted;

[0070] After the grouting strength reaches the design strength, the second batch of concrete is poured to form the upper layer of concrete 27, after the strength of the upper layer of concrete 27 reaches 90% of the design strength, the second batch of prestressed tendons is tensioned, the reserved pipe holes of the lower layer of concrete 26 are grouted, and finally the anchoring concrete of the both side end portions of the upper cross beam 2 is poured.

[0071] Optionally, in step S5, after the pouring and curing of the upper cross beam 2 are completed, the support height of the unloading block 20 is adjusted to realize the unloading, and then the tower crane is used to sequentially remove the construction bottom mold of the upper cross beam 2, the 22# H-shaped distribution beam 23, the bailey 22, the bearing beam 21 and the unloading block 20, and finally the first and second bracket supports are sequentially removed.

[0072] Optionally, in step S2, the following steps are included:

[0073] (1) When the steel reinforcement net frame of the tower column 1 is erected, a plurality of connecting sleeves 4 and a plurality of pipe fittings 5 are arranged in the steel reinforcement net frame of the tower column 1, and correspond to the position of the main reinforcement and the position of the prestressed pipe of the upper cross beam 2 respectively;

[0074] The end of the connecting sleeve 4 facing the tower column 1 is closed, and the end facing the upper cross beam 2 is provided with an internal thread, and a threaded connecting sleeve 4 cover is connected, the outer diameter of the sleeve cover 28 is equal to the outer diameter of the connecting sleeve 4;

[0075] The end of the pipe fitting 5 facing the tower column 1 is closed, and the end facing the upper cross beam 2 has an opening, that is, the pipe opening of the pipe fitting 5, and the pipe opening of the pipe fitting 5 protrudes from the inner side surface of the tower column 1;

[0076] (2) make the climbing formwork template corresponding to the position of the upper beam 2 of the tower column 1, the first recess is provided at the position corresponding to the connecting sleeve 4, the second recess is provided at the position corresponding to the pipe fitting 5, the first recess and the second recess are both protruded to the upper beam 2 direction, and are respectively used for accommodating the sleeve cover 28 and the pipe opening of the pipe fitting 5;

[0077] (3) install the climbing formwork template made in step (2) on the outside of the tower column 1 steel reinforcement frame, the sleeve cover 28 is inserted into the first recess and the end is abutted against the vertical inner wall surface of the first recess, and the pipe opening of the pipe fitting 5 is inserted into the second recess and the end is abutted against the vertical inner wall surface of the second recess;

[0078] (4) fill the foamed plastic between the side surface of the sleeve cover 28 and the inner side surface of the first recess, and between the side surface of the pipe opening of the pipe fitting 5 and the inner side surface of the second recess, so as to avoid the concrete entering the gap of the recess when pouring the concrete, and further fix the positions of the connecting sleeve 4 and the pipe fitting 5.

[0079] Further, in step (1), the end of the connecting sleeve 4 towards the upper beam 2 is flush with the inner side surface of the tower column 1, since the sleeve cover 28 has a thickness, after the connecting sleeve 4 and the sleeve cover 28 are connected, the sleeve cover 28 protrudes from the inner side surface of the tower column 1.

[0080] In step (2), the size of the first recess is adapted to the sleeve cover 28 and slightly larger than the sleeve cover 28; the size of the second recess is adapted to the pipe opening of the pipe fitting 5 and slightly larger than the pipe opening of the pipe fitting 5, so as to leave a gap for filling the foamed plastic.

[0081] Optionally, before step S4, after the tower column 1 is cured, the climbing formwork template is removed, the foamed plastic at the sleeve cover 28 and the pipe opening of the pipe fitting 5 is removed, the part of the foamed plastic combined with the concrete is removed by tools, a small amount of damaged inner side surface of the tower column 1 is repaired by cement, the sleeve cover 28 is removed from the connecting sleeve 4. The removed climbing formwork template and the sleeve cover 28 can be used again when another tower column 1 or other tower column 1 is constructed. The connection of the main reinforcement of the upper beam 2 and the connecting sleeve 4, the connection of the pre-stressed pipe and the pipe fitting 5, and the binding of the remaining reinforcement in step S4 are all prior art, which are not limited in the present application.

[0082] In step S4, the connecting structure 29 is uniformly arranged in the inside of the reinforcement of the upper beam 2 at the same time when the reinforcement of the upper beam 2 is bound, Figure 8As shown, the connecting structure 29 comprises a first end plate 30, a second end plate 31, a plurality of inner connecting bars 32 and a plurality of outer connecting bars 33, the first end plate 30 and the second end plate 31 are the same structure and arranged in upper and lower, the first end plate 30 is in the inside of the upper layer concrete 27, the second end plate 31 is in the inside of the lower layer concrete 26; the inner connecting bars 32 are connected between the first end plate 30 and the second end plate 31, the upper of the first end plate 30 and the lower of the second end plate 31 are provided with the outer connecting bars 33, which are used to connect other steel bars of the upper beam 2.

[0083] Further optional, the first end plate 30 is a circular ring, a first through hole is arranged in the center, a plurality of tension holes are arranged on the surface of the first end plate 30 and evenly arranged along the circumference of the first end plate 30;

[0084] The second end plate 31 is a circular ring, a second through hole is arranged in the center, a plurality of tension holes are arranged on the surface of the second end plate 31 and evenly arranged along the circumference of the second end plate 31.

[0085] Further optional, the upper and lower ends of the inner connecting bar 32 are provided with a stub, the two ends of the inner connecting bar 32 are respectively inserted into the large holes of the tension holes of the first end plate 30 and the second end plate 31, the first end plate 30 and the second end plate 31 are horizontally rotated, so that the inner connecting bar 32 enters the small holes of the tension holes, the stub at the bottom end of the inner connecting bar 32 is on the lower surface of the second end plate 31, the stub at the top end of the inner connecting bar 32 is on the upper surface of the first end plate 30, so that the inner connecting bar 32 is clamped between the first end plate 30 and the second end plate 31.

[0086] Further optional, one end of the outer connecting bar 33 is provided with a stub, after the installation of the inner connecting bar 32 between the first end plate 30 and the second end plate 31 is completed, the top of the outer connecting bar 33 connected with the first end plate 30 is provided with a stub, the outer connecting bar 33 penetrates the large holes of the tension holes of the first end plate 30 from top to bottom, and the bottom of the outer connecting bar 33 is connected with the steel bar;

[0087] The bottom of the outer connecting bar 33 connected with the second end plate 31 is provided with a stub, the outer connecting bar 33 penetrates the large holes of the tension holes of the second end plate 31 from bottom to top, and the top of the outer connecting bar 33 is connected with the steel bar.

[0088] Further optional, the connecting structure 29 further comprises a hollow steel column 34, the height of the steel column 34 is slightly smaller than the height of the upper beam 2, the steel column 34 penetrates the connecting structure 29 through the first through hole of the first end plate 30 and the second through hole of the second end plate 31, the steel column 34, the first end plate 30 and the second end plate 31 are concentrically arranged;

[0089] The lower layer concrete 26 is poured at the same time, and the inside of the steel column 34 is also poured, so that an integral concrete column is formed in the inside of the steel column 34, and the concrete column penetrates in the inside of the upper beam 2.

[0090] The mounting of the connection structure 29 is simple. The inner connecting rib 32 is mounted first, then the outer connecting rib 33 above the first end plate 30 is mounted, the outer connecting rib 33 is fixed by binding with the steel bars on the upper layer of the upper cross beam 2, the first end plate 30 is in a suspended state, the position of the first end plate 30 is fixed, the top end of the inner connecting rib 32 is clamped with the first end plate 30, the bottom end is clamped with the second end plate 31, the first end plate 30 can fix the position of the second end plate 31 through the inner connecting rib 32, then the outer connecting rib 33 below the second end plate 31 is mounted, and the binding is performed. The first end plate 30 is embedded in the lower layer concrete 26, the second end plate 31 is embedded in the upper layer concrete 27, the inner connecting rib 32 and the steel column 34 and the concrete column inside all penetrate the interface between the upper and lower layer concretes 26, and the connection strength of the upper and lower layer concretes 26 can be enhanced.

[0091] Further, a partition plate 35 is arranged between the two adjacent connection structures 29, as shown in Figure 9 The partition plate 35 includes horizontal connecting plates 36 at both ends and a detachable corrugated plate 37 in the middle. The horizontal connecting plate 36 is connected between the first end plate and the second end plate 31, the center of the horizontal connecting plate 36 is provided with a third through hole corresponding to the steel column 34, and a plurality of fourth through holes corresponding to the inner connecting rib 32 are arranged around. When mounting, the inner connecting rib is sequentially penetrated through the first end plate 30, the horizontal connecting plate 36 and the second end plate 31, and the steel column 34 is also sequentially penetrated through the first end plate 30, the horizontal connecting plate 36 and the second end plate 31, so as to connect the partition plate 35 and the connection structure 29 together;

[0092] The corrugated plate 37 is in a corrugated shape, has adjacent wave crests and wave troughs, and the two sides of the corrugated plate 37 are provided with vertical guard plates 38. The top of the guard plate 38 is flush with the wave crest, the bottom is flush with the wave trough, and the two side guard plates 38 form a cavity with the wave trough;

[0093] When mounting, the lower surface of the wave crest is arranged on the horizontal steel bars at the interface between the two times of pouring concrete, and the wave trough naturally drops. The cavity is recessed into the steel bar frame inside the lower layer concrete. When pouring the lower layer concrete, there is no concrete in the cavity. After the lower layer concrete is cured, the corrugated plate 37 is removed, and a recessed shape is formed on the upper surface of the lower layer concrete. When pouring the upper layer concrete, the recessed shape is filled, so that the interface between the upper and lower concretes forms a zigzag shape, which is beneficial to improve the connection strength of the upper and lower layer concretes.

Claims

1. A method for the asynchronous construction of a bridge pylon and a beam thereon, characterized in that, The method comprises the following steps: S1: embedding a plurality of connecting units on the inner side of the tower column when the tower column is constructed to the upper cross beam section, for corresponding connection of a plurality of triangular support brackets below the upper cross beam; S2: arranging a plurality of connecting sleeves and a plurality of reserved pipeline holes on the inner side of the tower column and at the position corresponding to the upper cross beam, the connecting sleeves being used for corresponding connection of the main reinforcement of the upper cross beam, and the reserved pipeline holes being used for corresponding connection of the prestressed pipeline of the upper cross beam; S3: after the tower column is completed, the triangular support bracket comprises upper and lower corbel supports, each of which is connected with a connecting unit, and the installation of the triangular support bracket is completed; S4: connecting the main reinforcement in the upper cross beam with the connecting sleeve, and then binding the main reinforcement and the remaining reinforcement of the upper cross beam; connecting the prestressed pipeline in the upper cross beam with the reserved pipeline hole; S5: pouring the first batch of concrete of the upper cross beam, after the first batch of poured concrete is cured, tensioning the first batch of prestressed tendons, after reaching the strength requirement, continuing to pour the second batch of concrete, after the second batch of poured concrete is cured, tensioning and grouting the second batch of prestressed tendons; and finally removing the triangular support bracket; In step S2, the main reinforcement and the prestressed pipeline of the upper cross beam are parallel to the length direction of the upper cross beam, the connecting sleeve is a straight thread connecting sleeve, and the reserved pipeline hole is the pipe opening of a plastic pipe or a metal pipe embedded in the tower column; In step S2, the following steps are included: (1) when the steel reinforcement net frame of the tower column is erected, a plurality of connecting sleeves and a plurality of pipe fittings are arranged in the steel reinforcement net frame of the tower column and correspond to the positions of the main reinforcement and the prestressed pipeline of the upper cross beam respectively; The end of the connecting sleeve facing the tower column is closed, the end facing the upper cross beam is provided with an internal thread, and the thread connecting sleeve cover is arranged, the outer diameter of the sleeve cover being equal to the outer diameter of the connecting sleeve; The end of the pipe fitting facing the tower column is closed, the end facing the upper cross beam has an opening, which is the pipe opening of the pipe fitting, and the pipe opening of the pipe fitting protrudes from the inner side of the tower column; (2) a climbing formwork corresponding to the position of the upper cross beam of the tower column is made, the formwork is provided with a first recess at the position corresponding to the connecting sleeve and a second recess at the position corresponding to the pipe fitting, the first recess and the second recess both protrude towards the upper cross beam and are used for accommodating the sleeve cover and the pipe opening of the pipe fitting respectively; (3) the climbing formwork made in step (2) is installed on the outer side of the steel reinforcement net frame of the tower column, the sleeve cover extends into the first recess and the end thereof abuts against the vertical inner wall surface of the first recess, and the pipe opening of the pipe fitting extends into the second recess and the end thereof abuts against the vertical inner wall surface of the second recess; (4) the side surface of the sleeve cover and the inner side surface of the first recess, and the side surface of the pipe opening of the pipe fitting and the inner side surface of the second recess are both filled with foamed plastic.

2. The method of constructing an asymmetrical bridge tower and deck according to claim 1, wherein In step S1, the portal-shaped cable tower comprises two opposite tower columns, the side surfaces of the tower columns facing each other are the inner side of the tower column, and the plurality of triangular support brackets are evenly arranged in the width direction of the upper cross beam respectively.

3. The method of asynchronic construction of a bridge pylon with its upper beam according to claim 1, characterized in that, The triangular support bracket comprises a horizontal rod, a first inclined rod and a second inclined rod, one end of the horizontal rod is provided with a first corbel support, the other end is connected to the top end of the first inclined rod, and the bottom end of the first inclined rod is provided with a second corbel support; the top end of the second inclined rod is connected to the position of the horizontal rod close to the first corbel support, and the bottom end is connected to the middle part of the first inclined rod, so that the horizontal rod, the second inclined rod and the middle upper part of the first inclined rod form a triangle.

4. The method of asynchronic construction of a bridge pylon with its upper beam according to claim 3, characterized in that, The connecting unit comprises a corbel, an anchor plate and a plurality of screw rods in sequence, the screw rods are pre-buried in the inner side of the tower column, the anchor plate is laid on the surface of the inner side of the tower column, and the screw rod head is fixedly connected with the anchor plate through a climbing cone and a bolt; The end of the corbel is fixedly connected with the outer side of the anchor plate, the top of the corbel is provided with two symmetrically arranged corbel ear plates, and the corbel is connected with the corbel support through the corbel ear plates.

5. The method of asynchronic construction of a bridge pylon with its upper beam according to claim 4, characterized in that, In step S3, the corbel support comprises a hollow support frame, a reinforcing plate and a pin shaft, the support frame is inserted between the two corbel ear plates, the inner and outer sides of the two sides of the support frame facing the corbel ear plates are each provided with a reinforcing plate parallel thereto, the middle parts of the support frame, the reinforcing plate and the corbel ear plate are each provided with a through hole corresponding to each other, and the pin shaft penetrates the support frame from one side of the corbel ear plate and then penetrates the other side of the corbel ear plate, so as to fixedly connect the corbel support with the connecting unit.

6. The method of asynchronic construction of a bridge pylon with its upper beam according to claim 1, characterized in that, After step S3, the unloading block, the bearing beam, the Bailey and the No. 22 I-shaped distribution beam are sequentially installed from bottom to top above the triangular support bracket as a support foundation during the construction of the upper cross beam. The bearing beam is in the direction of the bridge direction, the bearing beam is perpendicular to the upper cross beam, and a plurality of bearing beams are uniformly arranged along the length direction of the upper cross beam. The No. 22 I-shaped distribution beam is parallel to the width direction of the upper cross beam, a plurality of No. 22 I-shaped distribution beams are uniformly arranged along the length direction of the upper cross beam, and correspond to the support nodes of the Bailey. The upper side of the No. 22 I-shaped distribution beam is sequentially provided with a square wood and a Wisa plate as a construction bottom die of the upper cross beam.

7. The method of asynchronic construction of a bridge pylon with its upper beam according to claim 1, characterized in that, In step S4, while the steel bars of the upper cross beam are bound, a plurality of connecting structures are uniformly arranged in the interior of the steel bars of the upper cross beam, the connecting structure comprises a first end plate, a second end plate, a plurality of inner connecting bars and a plurality of outer connecting bars, the first end plate and the second end plate are the same in structure and are arranged in an up-down mode, the first end plate is in the interior of the upper layer of concrete, and the second end plate is in the interior of the lower layer of concrete; the inner connecting bars are connected between the first end plate and the second end plate, the upper side of the first end plate and the lower side of the second end plate are each provided with an outer connecting bar for connecting other steel bars of the upper cross beam.

8. The method of asynchronic construction of a bridge pylon with its upper beam according to claim 7, characterized in that, The first end plate is a circular ring, a first through hole is arranged at the center, a plurality of tension holes are arranged on the plate surface of the first end plate and are uniformly arranged along the circumferential direction of the first end plate. The second end plate is a circular ring, a second through hole is arranged at the center, a plurality of tension holes are arranged on the plate surface of the second end plate and are uniformly arranged along the circumferential direction of the second end plate.

9. The method of asynchronic construction of a bridge pylon with its upper beam according to claim 8, characterized in that, The upper and lower ends of the inner connecting rib are provided with stubs, the two ends of the inner connecting rib are respectively inserted into the large holes of the tension holes of the first end plate and the second end plate, the first end plate and the second end plate are horizontally rotated, so that the inner connecting rib enters the small holes of the tension holes, the stub at the bottom end of the inner connecting rib is located on the lower surface of the second end plate, and the stub at the top end of the inner connecting rib is located on the upper surface of the first end plate, so that the inner connecting rib is clamped between the first end plate and the second end plate. One end of the outer connecting rib is provided with a stub, after the installation of the inner connecting rib between the first end plate and the second end plate is completed, the top of the outer connecting rib connected with the first end plate is provided with a stub, the outer connecting rib penetrates the large hole of the tension hole of the first end plate from top to bottom, and the bottom of the outer connecting rib is connected with the steel bar. The bottom of the outer connecting rib connected with the second end plate is provided with a stub, the outer connecting rib penetrates the large hole of the tension hole of the second end plate from bottom to top, and the top of the outer connecting rib is connected with the steel bar.

Images