Viaduct large-span bearing platform structure and construction method thereof

Abstract

The invention discloses a viaduct large-span bearing platform structure and a construction method thereof, suite connectors are arranged at intervals in the vertical direction, and pier fixing suite and pile fixing suite vertically extend into a bearing platform and are connected with each other through the suite connectors; the supporting mechanism comprises a bearing pipe network arranged on the upper layer of the bearing platform and a supporting pipe network arranged on the lower layer of the bearing platform, and the bearing pipe network and the supporting pipe network are arranged in a spaced mode and connected with the bottom of the suite connector. By arranging the fixing mechanism, rigid connection between the pier column and the pile foundation is formed, the vertical stress of the pier column is directly transmitted to the pile foundation, and the load burden of the bearing platform is effectively relieved; through the arrangement of the supporting mechanism, after the bearing net part is stressed and pressed downwards, the unloading net part performs stress decomposition, and part of vertical stress is converted into horizontal stress so as to counteract the longitudinal load of the pier column; under the sequential action of the multiple layers of bearing pipe networks, the vertical stress of the pier column is greatly weakened, and the bearing capacity and the deformation resistance of the bearing platform are integrally improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge structures, and in particular to a viaduct large-span bearing platform structure and a construction method thereof. Background Art

[0002] As the basic structure of the bridge, the cap is connected to the pile foundation and piers, bearing the loads on the piers and above, and plays an important role in the bridge structure. With the rapid development of domestic infrastructure work, the scene of bridge construction has become more and more extensive, especially with the expansion of urban road network construction, viaducts have become key facilities for urban reconstruction and road upgrades. In order to adapt to the environment of rivers, mountains, rails, etc., it is often necessary to use large-span caps.

[0003] During the use of large-span caps, the loads on the piers and above are often greater. After acting on the cap surface, a large longitudinal load will be formed, which will produce a downward bending moment on the cap. If only relying on the steel skeleton inside the cap, its bearing capacity and deformation resistance are limited, and it is difficult to resist the burden of the longitudinal load, resulting in compression deformation of the cap. On the one hand, the structural stability of the elevated bridge cannot be ensured, and on the other hand, it is easy to damage the soil structure under the cap, posing a major safety hazard. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to provide a viaduct large-span bearing platform structure and a construction method thereof.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A viaduct large-span cap structure comprises a horizontally arranged cap, piers symmetrically arranged on the left and right sides of the cap, and pile foundations uniformly arranged below the cap, wherein the piers and the pile foundations are coaxially arranged, a fixing mechanism is arranged between the piers and the pile foundations, and a supporting mechanism is arranged inside the cap, and is characterized in that:

[0007] The fixing mechanism includes a pier fixing kit arranged inside the pier column, a pile fixing kit arranged inside the pile foundation, and a kit connector arranged inside the cap, the kit connectors are arranged at intervals along the vertical direction, the pier fixing kit and the pile fixing kit respectively extend vertically to the inside of the cap, and are connected to each other through the kit connector;

[0008] The supporting mechanism includes a receiving pipe network arranged on the upper layer of the capping platform, and a supporting pipe network arranged on the lower layer of the capping platform, the receiving pipe network and the supporting pipe network are arranged at intervals and are respectively connected to the bottom of the kit connector;

[0009] The supporting pipe net is an upwardly protruding structure, including a supporting net portion and an extending net portion arranged above and below, a force unloading net portion is connected between the supporting net portion and the extending net portion, the supporting net portion is horizontally arranged and corresponds to the internal position of the pier, and the force unloading net portion is inclined and corresponds to the outer edge position of the pier.

[0010] Preferably, the pier fixing kit includes a pier fixing ring and pier fixing rods evenly distributed around the pier fixing ring, the pier fixing rods vertically extend from the top of the pier column to the bottom of the pedestal and are tightly connected to the pier fixing ring; the pile fixing kit includes a pile fixing ring and pile fixing rods evenly distributed around the pile fixing ring, the pile fixing rods vertically extend from the bottom of the pile foundation to the top of the pedestal and are tightly connected to the pile fixing ring, and the pier fixing rods are fixed to the pile fixing rods by a kit connector.

[0011] Preferably, the kit connector includes a coaxially arranged kit inner ring and a kit outer ring, the kit inner ring is embedded in the kit outer ring and fixed with each other; the kit inner ring is vertically aligned with the pile fixing ring and plugged into the pile fixing pole, and the kit outer ring is vertically aligned with the pier fixing ring and plugged into the pier fixing pole; longitudinal springs are respectively connected between adjacent kit inner rings and adjacent kit outer rings, and the longitudinal springs are sleeved on the outside of the pile fixing pole and the pier fixing pole.

[0012] Preferably, the fixing mechanism also includes a foundation fixing ring arranged at the bottom of the pedestal, the foundation fixing ring is coaxially arranged with the pile fixing ring and is connected with a foundation oblique rod, the foundation oblique rod extends obliquely upward from the foundation fixing ring, an inclined spring is sleeved on the outer side of the foundation oblique rod, and both ends of the inclined spring are respectively abutted against the foundation fixing ring and the pier fixing ring.

[0013] Preferably, the receiving pipe network and the supporting pipe network are three layers arranged at intervals, the three layers of the receiving pipe network are arranged from top to bottom, and the inclination angle of the corresponding unloading network portion gradually decreases, and the supporting pipe network is vertically aligned with the receiving pipe network.

[0014] Preferably, the receiving pipe network and the supporting pipe network respectively include a number of crisscrossed receiving stress pipes and supporting stress pipes, the receiving stress pipes and the supporting stress pipes are hollow and have stress steel cables inserted inside, the stress steel cables extend from both ends of the receiving stress pipes and the supporting stress pipes and are connected with fastening components.

[0015] Preferably, the fastening assembly includes a limiting cable sleeve arranged at the end of the stress steel cable, and a stop flange arranged on the end of the stress tube and supporting the stress tube, and a transverse spring is connected between the limiting cable sleeve and the stop flange.

[0016] A construction method for a viaduct large-span bearing structure, characterized in that it comprises the following steps:

[0017] Step 1: Build the pile foundation:

[0018] Drill pile holes under the ground, check the construction drawings to determine the location where the piers need to be set up, mark the pile holes that correspond vertically to them, and use the marked pile holes as reference holes. The pile fixing kit is buried inside the reference holes, and the upper end of the pile fixing kit extends out of the ground; put the steel cage vertically into the pile hole, connect the steel cage and the pile fixing kit in an interlaced manner, pour concrete into the steel cage, and obtain the pile foundation after the concrete reaches the designed strength;

[0019] Step 2: Build the foundation:

[0020] A cap steel frame is built above the pile foundation, the supporting pipe network is laid on the lower layer of the cap steel frame, the receiving pipe network is laid on the upper layer of the cap steel frame, the supporting pipe network and the receiving pipe network are spaced apart, and the supporting network is vertically aligned with the reference hole; a range is drawn on the ground according to the size of the pier column, the supporting network corresponds to the inside of the pier column, and the unloading network corresponds to the outer edge of the pier column; prestress is applied to the supporting pipe network and the receiving pipe network through prestressing tensioning; the pier fixing kit is vertically connected to the pile foundation kit and fixed through the kit connector, the upper end of the pier fixing kit extends from the cap steel frame, and the kit connector is fixed above the supporting pipe network and the receiving pipe network; concrete is poured into the cap steel frame, and the cap is obtained after the concrete reaches the design strength;

[0021] Step 3, build the pier:

[0022] A pier column reinforcement frame is built above the cap, the pier column reinforcement frame is cross-connected with the pier fixing kit, concrete is poured into the pier column reinforcement frame, and the pier column is obtained after the concrete reaches the designed strength.

[0023] The present invention has the following beneficial effects:

[0024] The present invention forms a rigid connection between the pier column and the pile foundation by setting a fixing mechanism, and directly transmits the vertical stress of the pier column to the pile foundation, and effectively reduces the load burden of the pedestal by using the good bearing capacity of the pile foundation; the connector of the kit is overlapped on each layer of the receiving pipe network and the supporting pipe network, so as to improve the transmission efficiency of the vertical stress and give full play to the resistance effect of the supporting mechanism. By setting the supporting mechanism, when the vertical stress of the pier column acts on the pedestal, the receiving pipe network is used for support. After the supporting network part is pressed down by force, the unloading network part performs stress decomposition, and part of the vertical stress is converted into horizontal stress to offset the longitudinal load of the pier column; under the sequential action of multiple layers of receiving pipe networks, the vertical stress of the pier column is greatly weakened, and then the supporting pipe network is used for foundation reinforcement, and prestressing is adopted. The supporting pipe network and the receiving pipe network have longitudinal prestress, which improves the bearing capacity and deformation resistance of the pedestal as a whole, and avoids the compression deformation of the pedestal. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The structural diagram of the support platform of the present invention is

[0026] Figure 2 A schematic diagram of the structure of the fixing mechanism of the present invention

[0027] Figure 3 Schematic diagram of the assembly of the fixing mechanism of the present invention

[0028] Figure 4 The front view of the support mechanism of the present invention

[0029] Figure 5 A side view of the support mechanism of the present invention

[0030] Figure 6 This is a structural diagram of the receiving pipe network of the present invention.

[0031] Figure 7 This is a schematic diagram of the structure of the supporting pipe network of the present invention.

[0032] Figure 8 The structural diagram of the supporting net part of the present invention is

[0033] Fig. 9 A schematic diagram of the structure of the fastening assembly of the present invention

[0034] Description of the drawings: cap 1, pier 2, pile foundation 3, receiving pipe network 4, supporting pipe network 5, supporting net part 6, extension net part 7, unloading net part 8, pier fixing ring 9, pier fixing pole 10, pile fixing ring 11, pile fixing pole 12, kit inner ring 13, kit outer ring 14, foundation fixing ring 15, foundation diagonal rod 16, receiving stress tube 17, supporting stress tube 18, stress steel cable 19, limiting rope sleeve 20, stop flange 21. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Reference Figures 1 to 9 , an embodiment provided by the present invention:

[0037] A viaduct large-span cap 1 structure, comprising a cap 1 arranged horizontally, piers 2 symmetrically arranged on the left and right sides of the cap 1, and pile foundations 3 uniformly arranged below the cap 1, the piers 2 and the pile foundations 3 being arranged coaxially, a fixing mechanism being arranged between the piers 2 and the pile foundations 3, and a supporting mechanism being arranged inside the cap 1: the fixing mechanism comprising a pier fixing kit arranged inside the pier 2, a pile fixing kit arranged inside the pile foundation 3, and a kit connector arranged inside the cap 1, the kit connector being arranged at intervals in the vertical direction, and the pier fixing kit and the pile fixing kit respectively extending vertically to the inside of the cap 1 , and are connected to each other through a kit connector; the supporting mechanism includes a supporting pipe network 4 arranged on the upper layer of the pedestal 1, and a supporting pipe network 5 arranged on the lower layer of the pedestal 1, the supporting pipe network 4 and the supporting pipe network 5 are arranged at intervals, and are respectively connected to the bottom of the kit connector; the supporting pipe network 4 is an upwardly protruding structure, including a supporting net portion 6 and an extending net portion 7 arranged up and down, and a force unloading net portion 8 is connected between the supporting net portion 6 and the extending net portion 7, the supporting net portion 6 is horizontally arranged and corresponds to the internal position of the pier 2, and the force unloading net portion 8 is inclined and corresponds to the outer edge position of the pier 2.

[0038] The cap 1 is horizontally arranged on the ground, the top of the cap 1 is connected to the pier 2, and the bottom of the cap 1 is connected to the pile 3. There are two piers 2, which are respectively located on the left and right sides of the cap 1. The pier 2 and the pile 3 are cylindrical structures, which are vertically installed and coaxially arranged. The fixing mechanism is located between the pier 2 and the pile 3, and rigidly connects the pier 2 and the pile 3. The supporting mechanism is located inside the cap 1 to provide a reinforcement for the supporting mechanism. The pier fixing kit is located inside the pier 2 and is coaxially aligned with the pier 2. The pile fixing kit is located inside the pile 3 and is coaxially aligned with the pile 3. The kit connector is located inside the cap 1 and is vertically aligned with the pier fixing kit and the pile fixing kit. Several kit connectors are arranged at intervals and distributed in the vertical direction. The bottom of the pier fixing kit extends downward to the inside of the cap 1, and the top of the pile fixing kit extends upward to the inside of the cap 1. The pier fixing kit and the pile fixing kit are nested with each other and fixedly connected by the kit connector.

[0039] Several receiving pipe networks 4 are located on the upper layer of the cap 1, presenting an upwardly protruding structure, laid flat in the horizontal direction, and distributed at intervals in the vertical direction. Several supporting pipe networks 5 are located on the lower layer of the cap 1, presenting a horizontal mesh structure, laid flat in the horizontal direction, and distributed at intervals in the vertical direction. The receiving pipe network 4 includes crisscrossed receiving stress pipes 17, and the supporting pipe network 5 includes crisscrossed supporting stress pipes 18. The receiving pipe network 4 is vertically aligned with the supporting pipe network 5, and the receiving stress pipes 17 and the supporting stress pipes 18 are in corresponding positions. The longitudinal load acts vertically downward from the receiving pipe network 4 to the supporting pipe network 5. The kit connector located on the upper layer of the cap 1 is connected to the receiving pipe network 4, and the bottom of the kit connector is horizontally abutted against the top of the receiving pipe network 4. The kit connector located on the lower layer of the cap 1 is connected to the supporting pipe network 5, and the bottom of the kit connector is horizontally abutted against the top of the supporting pipe network 5, ensuring that the longitudinal load of each kit connector can directly act on the receiving pipe network 4 and the supporting pipe network 5 at the corresponding position, thereby improving the stress transfer efficiency.

[0040] The receiving pipe net 4 is an upwardly protruding structure, which corresponds to the position of the pier 2. Through pre-stretching and tensioning, the receiving pipe net 4 has a prestressed force that can offset a certain longitudinal load. The receiving pipe net 4 includes a supporting net portion 6, a force-releasing net portion 8 and an extended net portion 7 from top to bottom. The supporting net portion 6 is connected to the extended net portion 7 through the force-releasing net portion 8. The supporting net portion 6 is horizontally arranged, corresponding to the internal position of the pier 2, and is used to bear the vertical stress of the pier 2. The force-releasing net portion 8 is inclined, corresponding to the outer edge position of the pier 2. The vertical stress is decomposed through the inclined structure, and a certain vertical stress is converted into horizontal stress, thereby offsetting part of the vertical stress of the pier 2. The extended net portion 7 is horizontally arranged to disperse the horizontal stress and improve the overall force balance.

[0041] The present invention forms a rigid connection between the pier column 2 and the pile foundation 3 by setting a fixing mechanism, and directly transmits the vertical stress of the pier column 2 to the pile foundation 3, and effectively reduces the load burden of the platform 1 by using the good bearing capacity of the pile foundation 3; the kit connector is overlapped on each layer of the receiving pipe network 4 and the supporting pipe network 5 to improve the transmission efficiency of the vertical stress and give full play to the resistance effect of the supporting mechanism. By setting the supporting mechanism, when the vertical stress of the pier column 2 acts on the platform 1, the receiving pipe network 4 is used for support. After the supporting network part 6 is pressed down by force, the unloading network part 8 performs stress decomposition, and part of the vertical stress is converted into horizontal stress to offset the longitudinal load of the pier column 2; under the sequential action of the multiple layers of the receiving pipe network 4, the vertical stress of the pier column 2 is greatly weakened, and then the supporting pipe network 5 is used for foundation strengthening, and the prestressing is adopted. The supporting pipe network 5 and the receiving pipe network 4 have longitudinal prestress, which improves the bearing capacity and deformation resistance of the platform 1 as a whole, and avoids the platform 1 from being compressed and deformed.

[0042] In this embodiment, as a preference, the pier fixing kit includes a pier fixing ring 9, and pier fixing rods 10 evenly arranged around the pier fixing ring 9, the pier fixing rods 10 vertically extend from the top of the pier column 2 to the bottom of the pedestal 1, and are tightly connected to the pier fixing ring 9; the pile fixing kit includes a pile fixing ring 11, and pile fixing rods 12 evenly arranged around the pile fixing ring 11, the pile fixing rods 12 vertically extend from the bottom of the pile foundation 3 to the top of the pedestal 1, and are tightly connected to the pile fixing ring 11, and the pier fixing rods 10 and the pile fixing rods 12 are fixed by a kit connector.

[0043] The pier fixing collar 9 is horizontally arranged in a circular ring structure, and has a plurality of through holes on the surface for inserting the pier fixing rods 10. The pier fixing rods 10 are vertically installed and evenly arranged around the pier fixing collar 9. The pier fixing rods 10 extend vertically from the top of the pier column 2 to the bottom of the cap 1 and are tightly connected to the pier fixing collar 9. The pile fixing collar 11 is horizontally arranged in a circular ring structure, and has a plurality of through holes on the surface for inserting the pile fixing rods 12. The pile fixing rods 12 are vertically installed and evenly arranged around the pile fixing collar 11. The pile fixing rods 12 extend vertically from the bottom of the pile foundation 3 to the top of the cap 1 and are tightly connected to the pile fixing collar 11. The pier fixing rods 10 and the pile fixing rods 12 located inside the cap 1 are interlaced with each other and are tightly connected by a kit connector, so that the pier fixing kit and the pile fixing kit form an integral structure, forming a rigid connection between the pier column 2 and the pile foundation 3, and directly transmitting the vertical stress of the pier column 2 to the pile foundation 3.

[0044] In the present embodiment, preferably, the kit connector comprises a coaxially arranged kit inner ring 13 and a kit outer ring 14, the kit inner ring 13 being embedded in the kit outer ring 14 and being fixed with each other by clamping; the kit inner ring 13 is vertically aligned with the pile fixing ring 11 and plugged with the pile fixing pole 12, the kit outer ring 14 is vertically aligned with the pier fixing ring 9 and plugged with the pier fixing pole 10; longitudinal springs are respectively connected between adjacent kit inner rings 13 and adjacent kit outer rings 14, and the longitudinal springs are sleeved on the outside of the pile fixing pole 12 and the pier fixing pole 10.

[0045] The inner ring 13 and the outer ring 14 of the kit are annular structures with a plurality of through holes on the surface. The inner side of the outer ring 14 of the kit is provided with a step groove, and the inner ring 13 of the kit is embedded in the inner ring 14 of the kit, and is clamped in the step groove, and then connected and fixed by welding. The inner ring 13 of the kit is vertically aligned with the pile fixing ring 11, and the pile fixing rod 12 located inside the cap 1 is inserted into the through hole of the inner ring 13 of the kit. The outer ring 14 of the kit is vertically aligned with the pier fixing ring 9, and the pier fixing rod 10 located inside the cap 1 is inserted into the through hole of the outer ring 14 of the kit. Several kit connectors are arranged at intervals in the vertical direction, and the longitudinal spring is installed between adjacent inner rings 13 of the kit and is sleeved on the outside of the pile fixing rod 12. The longitudinal spring is installed between adjacent outer rings 14 of the kit and is sleeved on the outside of the pier fixing rod 10. Under the action of the kit connector, the pier fixing kit and the pile fixing kit form an integral structure, and the longitudinal spring is located between adjacent kit connectors, which can increase the fastening strength, reduce structural deformation, and improve the stability and load capacity of the foundation 1.

[0046] In the present embodiment, as a preference, the fixing mechanism also includes a foundation fixing ring 15 arranged at the bottom of the pedestal 1, the foundation fixing ring 15 is coaxially arranged with the pile fixing ring 11, and is connected with a foundation diagonal rod 16, the foundation diagonal rod 16 extends obliquely upward from the foundation fixing ring 15, an inclined spring is sleeved on the outer side of the foundation diagonal rod 16, and both ends of the inclined spring are respectively abutted against the foundation fixing ring 15 and the pier fixing ring 9.

[0047] The foundation fixing ring 15 is located at the bottom of the cap 1, horizontally installed on the ground, and has a circular ring structure, which is coaxially arranged with the pile fixing ring 11. The foundation inclined rod 16 extends upward from the foundation fixing ring 15, and the inclined spring is sleeved on the outside of the foundation inclined rod 16. The two ends of the inclined spring are respectively in contact with the foundation fixing ring 15 and the pier fixing ring 9. The foundation fixing ring 15 reinforces the kit connector, disperses part of the stress of the kit connector to the foundation fixing ring 15, and then transmits it to the ground, expanding the area of ​​action of the stress, and is used in conjunction with the inclined spring to reduce structural deformation, and further improve the stability and load capacity of the cap 1.

[0048] In this embodiment, as a preference, the receiving pipe network 4 and the supporting pipe network 5 are three layers arranged at intervals, the three layers of the receiving pipe network 4 are arranged from top to bottom, and the inclination angle of the corresponding unloading network part 8 gradually decreases, and the supporting pipe network 5 is vertically aligned with the receiving pipe network 4.

[0049] The receiving pipe network 4 is located on the upper layer of the pedestal 1, and the receiving pipe network 4 is located on the lower layer of the pedestal 1. The receiving pipe network 4 and the supporting pipe network 5 are arranged at intervals. The three layers of the receiving pipe network 4 are arranged from top to bottom, and the inclination angle of the corresponding unloading net part 8 gradually decreases, and the supporting pipe network 5 is vertically aligned with the receiving pipe network 4. It can be understood that the unloading net part 8 of the first layer of the receiving pipe network 4 has the largest slope, and the vertical stress acts on the inclined surface of the unloading net part 8. The stress decomposition effect is more obvious, which can offset the larger vertical stress and generate larger horizontal stress at the same time. The slope of the unloading net part 8 of the second and third layers of the receiving pipe network 4 decreases layer by layer, which can reduce the influence of horizontal stress on the pedestal 1, while taking into account the offset effect of vertical stress.

[0050] In this embodiment, as a preference, the receiving pipe network 4 and the supporting pipe network 5 respectively include a plurality of crisscross receiving stress tubes 17 and supporting stress tubes 18, the receiving stress tubes 17 and supporting stress tubes 18 are hollow, and stress steel cables 19 are inserted inside, the stress steel cables 19 extend from both ends of the receiving stress tubes 17 and supporting stress tubes 18, and are connected with fastening components.

[0051] The receiving pipe network 4 includes a plurality of crisscross receiving stress pipes 17, and the supporting pipe network 5 includes a plurality of crisscross supporting stress pipes 18. The receiving stress pipes 17 and the supporting stress pipes 18 are hollow, and stress steel cables 19 are inserted in both. The ends of the stress steel cables 19 extend from the receiving stress pipes 17 and the supporting stress pipes 18. When the stress steel cables 19 are installed, a prestressed tensioning method is adopted to apply tensile force to both ends of the stress steel cables 19. The stress steel cables 19 are in a taut state, and then fixed by a fastening assembly, so that the supporting pipe network 5 and the receiving pipe network 4 have longitudinal prestress, thereby improving the bearing capacity and anti-deformation ability of the cap 1.

[0052] In this embodiment, preferably, the fastening assembly includes a limiting rope sleeve 20 arranged at the end of the stress steel cable 19, and a stop flange 21 arranged at the end of the stress tube 17 and the support stress tube 18, and a transverse spring is connected between the limiting rope sleeve 20 and the stop flange 21.

[0053] The limiting cable sleeve 20 is fixed at the end of the stress steel cable 19, and the diameter of the limiting cable sleeve 20 is larger than the diameter of the receiving stress tube 17 and the supporting stress tube 18. The stop flange 21 is fixed at the end of the receiving stress tube 17 and the supporting stress tube 18, and the stop flange 21 and the limiting cable sleeve 20 are mutually abutted and limited. The transverse spring is located between the limiting cable sleeve 20 and the stop flange 21. After the tensile force is applied to the two ends of the stress steel cable 19, the stress steel cable 19 is in a taut state, and the transverse spring is in a compressed state, which can increase the tightening force, reduce structural deformation, offset part of the horizontal stress, and improve the stability and load capacity of the platform 1.

[0054] Reference Figures 1 to 9 , another embodiment provided by the present invention:

[0055] A construction method for a viaduct large-span cap 1 structure, characterized by comprising the following steps:

[0056] Step 1, build pile foundation 3:

[0057] Drill a pile hole below the ground, check the construction drawings, determine the location where the pier 2 needs to be set up, mark the pile hole vertically corresponding to it, and use the marked pile hole as the reference hole. The pile fixing kit is buried inside the reference hole, and the upper end of the pile fixing kit extends from the ground; vertically place the steel cage into the pile hole, the steel cage and the pile fixing kit are staggered and connected, and concrete is poured into the steel cage. After the concrete reaches the designed strength, the pile foundation 3 is obtained;

[0058] The pile fixing kit is embedded in the reference hole, including inserting a plurality of pile fixing rods 12 into the through holes on the surface of the pile fixing collar 11, the pile fixing collar 11 is installed at intervals along the pile fixing rods 12, the two are welded and fixed, and the pile fixing kit is vertically placed in the reference hole by hoisting. In addition, a steel cage can be arranged outside the pile fixing kit, the two are staggered and welded, and are vertically placed in the reference hole together.

[0059] Step 2, build platform 1:

[0060] A steel frame of the cap 1 is built above the pile foundation 3, and the supporting pipe network 5 is laid on the lower layer of the steel frame of the cap 1, and the receiving pipe network 4 is laid on the upper layer of the steel frame of the cap 1. The supporting pipe network 5 and the receiving pipe network 4 are spaced apart, and the supporting net portion 6 is vertically aligned with the reference hole; a range is drawn on the ground according to the size of the pier 2, the supporting net portion 6 corresponds to the inside of the pier 2, and the unloading net portion 8 corresponds to the outer edge of the pier 2; prestress is applied to the supporting pipe network 5 and the receiving pipe network 4 through prestressing; the pier fixing kit is vertically docked with the pile foundation 3 kit and fixed through the kit connector, the upper end of the pier fixing kit extends from the steel frame of the cap 1, and the kit connector is fixed above the supporting pipe network 5 and the receiving pipe network 4; concrete is poured into the steel frame of the cap 1, and the cap 1 is obtained after the concrete reaches the design strength;

[0061] The supporting pipe network 5 is laid in the lower layer of the steel frame of the pedestal 1, including crisscrossing the supporting stress pipes 18 to connect them into a mesh structure, inserting stress steel cables 19 inside the supporting stress pipes 18, applying tension to both ends of the stress steel cables 19 to a suitable prestress, and then connecting and fixing them with fastening components.

[0062] The supporting pipe network 4 is laid on the upper layer of the steel frame of the foundation 1, including drawing the range of the pier 2 on the ground in advance, crisscrossing the horizontal support stress tubes 18 to connect them into a supporting net part 6, and aligning with the internal position of the pier 2; connecting the inclined support stress tubes 18 along the outer side of the supporting net part 6 to connect them into a force unloading net part 8, and aligning with the outer edge of the pier 2; connecting the horizontal support stress tubes 18 along the outer side of the force unloading net part 8 to connect them into an extended net part 7, and aligning with the position of the support pipe network 5; inserting the stress steel cable 19 into the support stress tube 18, applying tension to both ends of the stress steel cable 19 to a suitable prestress, and then connecting and fixing them with fastening components.

[0063] The pier fixing kit is vertically docked with the pile foundation 3 kit, including inserting the kit outer ring 14 into the pile fixing kit, and the pile fixing rod 12 is not connected to the kit outer ring 14; inserting the kit inner ring 13 from the upper end of the pile fixing kit, and the pile fixing rod 12 is inserted into the through hole of the kit inner ring 13 and welded and fixed; the kit outer ring 14 moves upward, and the kit inner ring 13 is clamped in the step groove of the kit outer ring 14, and the two are clamped and welded to each other; a number of pier fixing rods 10 are inserted into the through holes on the surface of the pier fixing ring 9, and the pier fixing ring 9 is installed at intervals along the pier fixing rods 10, and the two are welded and fixed, and the lower end of the pier fixing rod 10 is inserted into the through hole of the kit outer ring 14 by hoisting, and welded and fixed.

[0064] Step 3, build pier 2:

[0065] A reinforcement frame for pier column 2 is built above the cap 1, the reinforcement frame for pier column 2 is cross-connected with the pier fixing kit, concrete is poured into the reinforcement frame for pier column 2, and pier column 2 is obtained after the concrete reaches the designed strength.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A viaduct large-span cap structure, comprising a horizontally arranged cap, piers symmetrically arranged on the left and right sides of the cap, and pile foundations uniformly arranged below the cap, wherein the piers and the pile foundations are coaxially arranged, a fixing mechanism is arranged between the piers and the pile foundations, and a supporting mechanism is arranged inside the cap, characterized in that: The fixing mechanism includes a pier fixing kit arranged inside the pier column, a pile fixing kit arranged inside the pile foundation, and a kit connector arranged inside the cap, the kit connectors are arranged at intervals along the vertical direction, the pier fixing kit and the pile fixing kit respectively extend vertically to the inside of the cap, and are connected to each other through the kit connector; The support mechanism includes a receiving pipe network arranged on the upper layer of the capping platform, and a supporting pipe network arranged on the lower layer of the capping platform, the receiving pipe network and the supporting pipe network are arranged at intervals and are respectively connected to the bottom of the kit connector; The supporting pipe net is an upwardly protruding structure, including a supporting net portion and an extending net portion arranged above and below, a force unloading net portion is connected between the supporting net portion and the extending net portion, the supporting net portion is horizontally arranged and corresponds to the internal position of the pier, and the force unloading net portion is inclined and corresponds to the outer edge position of the pier.

2. A viaduct large-span pier structure according to claim 1, characterized in that: The pier fixing kit includes a pier fixing ring and pier fixing rods evenly distributed around the pier fixing ring. The pier fixing rods extend vertically from the top of the pier column to the bottom of the pedestal and are tightly connected to the pier fixing ring; the pile fixing kit includes a pile fixing ring and pile fixing rods evenly distributed around the pile fixing ring. The pile fixing rods extend vertically from the bottom of the pile foundation to the top of the pedestal and are tightly connected to the pile fixing ring. The pier fixing rods are fixed to the pile fixing rods by a kit connector.

3. A viaduct large-span pier structure according to claim 2, characterized in that: The kit connector includes a coaxially arranged kit inner ring and a kit outer ring, the kit inner ring is embedded in the kit outer ring and fixed with each other; the kit inner ring is vertically aligned with the pile fixing ring and plugged into the pile fixing pole, and the kit outer ring is vertically aligned with the pier fixing ring and plugged into the pier fixing pole; longitudinal springs are respectively connected between adjacent kit inner rings and adjacent kit outer rings, and the longitudinal springs are sleeved on the outside of the pile fixing pole and the pier fixing pole.

4. A viaduct large-span pier structure according to claim 3, characterized in that: The fixing mechanism also includes a foundation fixing ring arranged at the bottom of the pedestal, the foundation fixing ring is coaxially arranged with the pile fixing sleeve ring and is connected with a foundation oblique rod, the foundation oblique rod extends obliquely upward from the foundation fixing ring, an inclined spring is sleeved on the outer side of the foundation oblique rod, and two ends of the inclined spring are respectively abutted against the foundation fixing ring and the pier fixing sleeve ring.

5. The viaduct large-span pedestal structure according to claim 1, characterized in that: The receiving pipe network and the supporting pipe network are three layers set at intervals. The three layers of the receiving pipe network are arranged from top to bottom, and the inclination angle of the corresponding unloading network part gradually decreases. The supporting pipe network is vertically aligned with the receiving pipe network.

6. A viaduct large-span pier structure according to claim 5, characterized in that: The receiving pipe network and the supporting pipe network respectively include a number of crisscross receiving stress pipes and supporting stress pipes. The receiving stress pipes and the supporting stress pipes are hollow and have stress steel cables inserted inside. The stress steel cables extend from both ends of the receiving stress pipes and the supporting stress pipes and are connected with fastening components.

7. A viaduct large-span pier structure according to claim 6, characterized in that: The fastening assembly includes a limiting cable sleeve arranged at the end of the stress steel cable, and a stop flange arranged on the end of the stress tube and supporting the stress tube, and a transverse spring is connected between the limiting cable sleeve and the stop flange.

8. The construction method of a viaduct long-span cap structure according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Build the pile foundation: Drill pile holes under the ground, check the construction drawings to determine the location where the piers need to be set up, mark the pile holes that correspond vertically to them, and use the marked pile holes as reference holes. The pile fixing kit is buried inside the reference holes, and the upper end of the pile fixing kit extends out of the ground; put the steel cage vertically into the pile hole, connect the steel cage and the pile fixing kit in an interlaced manner, pour concrete into the steel cage, and obtain the pile foundation after the concrete reaches the designed strength; Step 2: Build the foundation: A cap steel frame is built above the pile foundation, the supporting pipe network is laid on the lower layer of the cap steel frame, the receiving pipe network is laid on the upper layer of the cap steel frame, the supporting pipe network and the receiving pipe network are spaced apart, and the supporting network is vertically aligned with the reference hole; a range is drawn on the ground according to the size of the pier column, the supporting network corresponds to the inside of the pier column, and the unloading network corresponds to the outer edge of the pier column; prestress is applied to the supporting pipe network and the receiving pipe network through prestressing tensioning; the pier fixing kit is vertically connected to the pile foundation kit and fixed through the kit connector, the upper end of the pier fixing kit extends from the cap steel frame, and the kit connector is fixed above the supporting pipe network and the receiving pipe network; concrete is poured into the cap steel frame, and the cap is obtained after the concrete reaches the design strength; Step 3, build the pier: A pier column reinforcement frame is built above the foundation, the pier column reinforcement frame is cross-connected with the pier fixing kit, concrete is poured into the pier column reinforcement frame, and the pier column is obtained after the concrete reaches the designed strength.

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