Construction method of bridge precast support cushion stone

Abstract

The application provides a bridge prefabricated support cushion stone construction method, which comprises the following steps: arranging an anchor bolt hole preformed part and a lifting hole preformed part in a prefabricated formwork, pouring concrete to prefabricate a cushion stone, transporting the cushion stone to a site, lifting the cushion stone to a turnover support, turning over the cushion stone to make the anchoring steel bars on the cushion stone face downward and the anchor bolt holes face upward, lifting a positioning support to a top of a pier of a bridge support, connecting the positioning support with a pier body formwork, lifting the cushion stone to the positioning support through a lifting tool, aligning and leveling the cushion stone after lifting, and pouring the cushion stone and the bridge support as a whole. The application can realize three-dimensional adjustment of the position of the plane and the elevation of the prefabricated cushion stone, accurately prefabricate the position of the cushion stone, and reach the design requirement. The positioning mechanism is used to position the adjusted prefabricated cushion stone, so that the accuracy of the cushion stone construction is ensured. The prefabricated cushion stone is used, so that the on-site pouring is not needed, and the concrete is not vibrated densely due to the dense steel bars.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge construction, and particularly relates to a construction method for a bridge prefabricated support cushion stone. BACKGROUND

[0002] In bridge engineering, the support cushion stone is arranged between the top of the pier and the support, and has the functions of adjusting the slope of the support, adjusting the height of the support, and transmitting the upper load to the lower structure and foundation, and bears a large local concentrated load. The support cushion stone has the characteristics of small volume, large stress, stress concentration, dense distribution of steel bars, high construction precision requirement, and is an extremely important component in the bridge.

[0003] At present, the support cushion stone is mostly cast on site. Due to the small volume, insufficient attention of the construction unit, dense steel bars, and other reasons, the concrete is often not vibrated densely, resulting in the problem of surface cracking of the formed cushion stone. In the construction process of some bridge engineering using prefabricated cushion stones, the prefabricated cushion stone cannot be accurately positioned, resulting in the defects of unqualified surface elevation of the cushion stone and deviation of the reserved hole on the cushion stone, which affects the safety and service life of the bridge.

[0004] The defects of unqualified surface elevation and deviation of the reserved hole affect the safety and service life of the bridge.

[0005] Therefore, it is necessary to provide an improved technical solution for the above-mentioned deficiencies of the prior art. SUMMARY

[0006] The purpose of the application is to overcome the deficiencies in the prior art, and to provide a construction method for a bridge prefabricated support cushion stone.

[0007] In order to achieve the above-mentioned purpose, the application provides the following technical solution:

[0008] A construction method for a bridge prefabricated support cushion stone, comprising the following steps:

[0009] Step S1, placing a prefabricated formwork horizontally at a prefabrication site, binding anchor steel bars after installing a cushion stone steel bar positioning fixture in the prefabricated formwork, and pouring concrete to prefabricate the cushion stone after arranging an anchor hole embedded part in the prefabricated formwork;

[0010] Step S2, demolding and curing the cushion stone after the cushion stone reaches a predetermined strength;

[0011] Step S3, transporting the cushion stone to the site and hoisting it onto a turnover support, turning over the cushion stone so that the anchor steel bars on the cushion stone face downward and the anchor holes face upward;

[0012] Step S4, hoisting the positioning support to the top of the pier of the bridge support, and connecting the positioning support with the pier body formwork;

[0013] Step S5, installing lifting force bars capable of passing through the pre-arranged holes of the lifting tool in the four anchor bolt holes of the cushion stone, lifting the cushion stone to the positioning support through the lifting tool, and aligning and leveling the cushion stone after lifting is completed;

[0014] Step S6, binding the anti-cracking steel bars around the cushion stone, and then pouring the pier body concrete of the bridge support to integrate the cushion stone and the bridge support.

[0015] Preferably, the prefabricated formwork comprises a bottom formwork and a plurality of side formworks spliced above the bottom formwork, a steel bar positioning fixture is arranged inside the side formwork, and the anchor bolt hole embedded part extends into the prefabricated formwork through the adjusting frame;

[0016] First, the bottom formwork is horizontally checked, the side formwork is installed after the horizontal check of the bottom formwork is completed, and the side formwork and the bottom formwork are connected through bolts.

[0017] Preferably, the adjusting frame is a mouth-shaped or cross-shaped frame fixed on the upper surface of the side formwork, two adjusting arms are arranged inside the adjusting frame, a first slotted hole extending in the length direction of each adjusting arm is arranged on each adjusting arm, and the anchor bolt hole embedded part is correspondingly arranged in the first slotted hole to adjust the position of the anchor bolt hole embedded part in the first direction along the first slotted hole.

[0018] A second slotted hole perpendicular to the first slotted hole is arranged on the adjusting frame corresponding to the two ends of the adjusting arm, and the two adjusting arms slide in the second slotted hole to adjust the position of the anchor bolt hole embedded part in the second direction.

[0019] Preferably, the bottom surface and the top surface of the cushion stone are chiseled within the range corresponding to the bridge support after the cushion stone is maintained.

[0020] The distance between the anti-cracking steel bars and the outer circumferential surface of the cushion stone is 5 cm.

[0021] The whole cushion stone is wetted before the pier body concrete is poured, and the positioning support can be removed after the pouring of the pier body concrete is completed and the design strength is reached.

[0022] Preferably, the turnover support comprises:

[0023] A turnover seat, opposite sides of the turnover seat upwardly extend with hinge seats;

[0024] Two turnover blocks, the two turnover blocks are correspondingly hinged on the two hinge seats through hinge shafts, respectively, and the distance between the two turnover blocks is matched with the length of the cushion stone;

[0025] Two groups of positioning rods, the two groups of positioning rods are installed on both sides of the turnover blocks in the thickness direction of the cushion stone in a detachable manner to limit the thickness direction of the cushion stone;

[0026] Positioning pieces, the two sets of positioning pieces are respectively located on both sides of the flip block corresponding to the width direction of the pad stone, and extend toward the side of the pad stone to limit the width direction of the pad stone;

[0027] A flip handle is connected to a hinge shaft corresponding to any one of the flip blocks to flip the pad stone.

[0028] Preferably, the flipping block is adapted to the cross-section of the pad stone, and each set of the positioning rods has two rods, which are located on both sides of the flipping block and are fixedly connected to the flipping block by bolts.

[0029] Each set of positioning plates has two pieces, which are located on the two flip blocks respectively and are fixedly connected to the flip blocks by bolts.

[0030] Preferably, the hoisting fixture includes two main frames and two auxiliary frames, which are connected to each other to form a square truss corresponding to the pad stones. Lifting lugs are provided at both ends of the two main frames.

[0031] The two main frames are provided with a third strip-shaped hole extending along their length direction, corresponding to the hoisting force transmission rod. The two main frames are provided with a locking seat, which is slidably assembled along the length direction of the main frame. The locking seat is provided with a through hole in the middle of the locking seat, corresponding to the hoisting force transmission rod. After the hoisting force transmission rod passes through the locking seat, it is connected to a corresponding locking mechanism.

[0032] Preferably, a drive rod is provided between each of the two lifting lugs on the same main frame and the locking seat to drive the locking seat to slide along the length of the main frame.

[0033] Preferably, the locking mechanism includes:

[0034] A support plate, wherein the middle part of the support plate is provided with a through hole corresponding to the hoisting force transmission rod;

[0035] The nut, after the lifting force transmission rod passes through the support plate, is threadedly connected to the nut, thereby blocking it above the support plate;

[0036] The lifting rods at both ends of each support plate are supported on the locking seat by two lifting rods to level the pad stone.

[0037] Preferably, the positioning bracket includes:

[0038] The positioning frame is a square frame corresponding to the hoisting fixture. The two ends of the main frame of the hoisting fixture are placed on the top of the positioning frame, and the bottom of the positioning frame is provided with support legs that are bolted to the pier body template.

[0039] Positioning pin, the positioning pin is screwed the positioning framework, multiple positioning pins are uniformly distributed in the circumference of the positioning framework, and extend into the inside of the positioning framework to abut the side of the cushion stone, so as to limit the cushion stone in the circumference.

[0040] Preferably, the lifting tool is slidingly assembled on the corresponding frame of the positioning framework, and adjusting rods are arranged at both ends of the corresponding frame of the lifting tool of the positioning framework, and the adjusting rods drive the lifting tool to slide along the frame of the positioning framework.

[0041] Beneficial effects: 1. The lifting tool can realize three-dimensional adjustment of the position of the plane and elevation of the prefabricated cushion stone, accurately prefabricate the position of the cushion stone, and achieve the design requirements, and the positioning support is used to position the adjusted cushion stone, so that the accuracy of the cushion stone construction is ensured, the prefabricated cushion stone is used to replace the on-site pouring method, the problem of easy cracking of the formed cushion stone surface caused by dense steel bars and non-dense concrete vibration is avoided, the quality of the cushion stone concrete is ensured, the cooperation of the hanging adjustment mechanism and the positioning mechanism ensures the accuracy of the reserved hole position of the cushion stone, and the construction cost is saved.

[0042] 2. The prefabricated cushion stone is installed during the pouring process of the pier body, once forming is realized, and secondary climbing operation is not needed, and the risk of falling from a high altitude is eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0043] The drawings accompanying the specification of this application form a part of the application and serve to further provide a further understanding of the application, the illustrative embodiments of the application and the explanations thereof serve to explain the application, and do not constitute an improper limitation of the application. Among them:

[0044] Figure 1 It is a structure schematic view of the prefabricated template of the application;

[0045] Figure 2 It is a structure schematic view of the turning production of the application;

[0046] Figure 3 It is a front view of the pier when the cushion stone is poured;

[0047] Figure 4 It is a side view of the pier when the cushion stone is poured;

[0048] Figure 5 It is a structure schematic view of the positioning support of the application;

[0049] Figure 6 It is a structure schematic view of the lifting tool of the application.

[0050] In the figure: 1, side mold; 2, position adjusting frame; 3, adjusting arm; 4, first strip hole; 5, second strip hole; 6, hoisting hole; 7, anchor bolt hole embedded part; 8, overturning seat; 9, hinged support; 10, hinge shaft; 11, overturning block; 12, positioning rod; 13, positioning sheet; 14, overturning handle; 15, pier body formwork; 16, positioning framework; 17, hoisting tooling; 18, support plate; 19, cushion stone; 20, hoisting dowel bar; 21, lifting rod; 22, driving rod; 23, positioning pin; 24, adjusting rod; 25, anchoring steel bar; 26, lifting lug; 27, locking seat. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in the present application belong to the scope of protection of the present application.

[0052] In the description of the present application, the orientations or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc. are the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application, and are not required to be the specific orientations and operations of the present application, and therefore cannot be understood as limiting the present application. The terms "connected", "connected" used in the present application should be understood broadly, for example, can be fixed connection, can also be detachable connection; can be directly connected, can also be indirectly connected through intermediate components. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0053] The present application will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0054] As Figures 1-5As shown, a bridge prefabricated support cushion stone construction method comprises the following steps: step S1, placing a prefabricated formwork horizontally in a prefabrication site, checking with a level to ensure its levelness, facilitating subsequent construction and avoiding uneven thickness of the cushion stone 19, after installing the cushion stone 19 steel positioning fixture, binding the anchoring steel 25, first binding the top layer steel of the cushion stone 19, the top layer steel must be accurately positioned according to the fixture mouth during installation. The second and third layer steels are arranged according to a plane spacing of 10 cm and a vertical spacing of 12 cm, the steels are firmly bound by binding wire to form a whole, after arranging the anchor hole embedded part 7 and the lifting hole 6 embedded part in the prefabricated formwork, pouring concrete to prefabricate the cushion stone 19; wherein, the cushion stone 19 needs to be provided with four lifting hole 6 embedded parts, the lifting hole 6 embedded parts penetrate through the cushion stone 19 to form four lifting points on the front and back surfaces of the cushion stone 19, the lifting points are arranged at 20 cm x 20 cm away from each corner point, the 32 finished rolled threaded steel connector is embedded, the change hook of the top layer steel is cancelled, and the length of the steel is appropriately increased. Step S2, after the cushion stone 19 reaches the predetermined strength, the formwork is removed and maintained; when the surface and edges of the concrete are not damaged due to the removal of the formwork, and the temperature difference between the concrete and the outside is not greater than 20℃, the formwork is removed. After the formwork is removed, the surface of the cushion stone 19 is immediately repaired, the excess concrete is chiseled off, the places with serious damage are repaired with special repair mortar, and the cross center line of the cushion stone 19 is placed on the pier body formwork 15 using a total station instrument as a reference line for positioning and adjusting the cushion stone 19. Step S3, after the cushion stone 19 is transported to the site, it is lifted to the turnover support to turn over the cushion stone 19, so that the anchoring steel 25 on the cushion stone 19 faces downward and the anchor hole faces upward; step S4, the positioning support is lifted to the top of the pier of the bridge support, and the positioning support and the pier body formwork 15 are connected by corresponding bolts, and the connection of the pier body formwork 15 is reinforced by adding a rib plate. Step S5, the lifting force transmission rod 20 which can pass through the reserved hole of the lifting tool 17 is installed in the four lifting holes 6 of the cushion stone 19, the lifting force transmission rod 20 can be a finished rolled threaded steel, the cushion stone 19 is lifted to the positioning support through the lifting tool 17, and the cushion stone 19 is leveled after lifting is completed; the position of the cushion stone 19 is finely adjusted after lifting is completed, and the adjustment principle is to level the plane first and then the elevation. The adjustment of the plane position is realized by the action of eight horizontal jacks, and the adjustment of the elevation of the cushion stone 19 is realized by the action of eight vertical jacks. The horizontal adjustment is based on the cross center line of the cushion stone 19, the vertical adjustment is detected by using a level, and the design requirements are reached. Step S6, the anti-cracking steel is bound around the cushion stone 19 to prevent cracks on the top of the pier around the cushion stone 19, and then the pier concrete of the bridge support is poured to integrate the cushion stone 19 and the bridge support.

[0055] In an alternative embodiment, the prefabricated template comprises: a bottom mold and side molds 1, a plurality of side molds 1 are spliced above the bottom mold to form a frame corresponding to the abutment 19, a steel positioning fixture is arranged inside the side mold 1, and the anchor hole embedded part 7 extends into the prefabricated template through the adjusting frame 2; before pouring the abutment 19, first, the bottom mold is horizontally checked, the side mold 1 is installed after the horizontal checking of the bottom mold is completed, and the side mold 1 and the bottom mold are connected by bolts, and the steel positioning fixture and the side mold 1 are connected by bolts.

[0056] In an alternative embodiment, the adjusting frame 2 is a mouth-shaped or cross-shaped frame fixed on the upper surface of the side mold 1, the cross-shaped frame is connected on the upper surface of the side mold 1 by bolts, two adjusting arms 3 are arranged in the adjusting frame 2, each adjusting arm 3 is provided with two first strip-shaped holes 4 extending along the length direction thereof, the anchor hole embedded part 7 is arranged in the first strip-shaped hole 4, the anchor hole embedded part 7 is adjusted according to the requirement, and the position of the anchor hole embedded part 7 is adjusted in the first direction along the first strip-shaped hole 4; the second strip-shaped hole 5 perpendicular to the first strip-shaped hole 4 is arranged on the adjusting frame 2 corresponding to the two ends of the adjusting arm 3, and the two adjusting arms 3 slide in the second strip-shaped hole 5, so that the position of the anchor hole embedded part 7 is adjusted in the second direction, in this embodiment, the first direction and the second direction are perpendicular to each other in the horizontal direction, so that the anchor hole embedded part 7 can be adjusted in the horizontal direction, and in this embodiment, according to the number of preset anchor holes, two or more than two adjusting frames 2 can be arranged on the same prefabricated template.

[0057] In an alternative embodiment, the outer surface of the abutment 19 is chiseled after the abutment 19 is maintained, the cross center line of the abutment 19 is placed on the pier body template 15 by using a total station instrument, and the cross center line is used as a reference line for positioning and adjusting the abutment 19, the distance between the anti-cracking steel and the outer periphery of the abutment 19 is 5 cm, a circle of Φ12 steel is bound at 5 cm outside the abutment 19, the anti-cracking steel should be installed firmly and accurately positioned, the abutment 19 is wetted as a whole before the pier body concrete is poured, the pier body concrete is poured after the abutment 19 is installed, and the tooling is removed when the concrete reaches 30% of the design strength.

[0058] In an optional embodiment, the overturning support comprises an overturning seat 8, overturning blocks 11, positioning rods 12, positioning sheets 13, and an overturning handle 14; wherein the two opposite sides of the overturning seat 8 each extend upwardly with a hinged support 9, the hinged support 9 can be a triangular frame body and is welded and fixed with the overturning seat 8, the two overturning blocks 11 are respectively provided with a hinged shaft 10, the overturning seat 8 is provided with a bearing seat and a bearing corresponding to the hinged shaft 10, the two overturning blocks 11 are correspondingly hinged on the two hinged supports 9 through the hinged shaft 10, the spacing between the two overturning blocks 11 is adapted to the length of the cushion stone 19, two groups of positioning rods 12 are respectively installed on the two sides of the overturning blocks 11 corresponding to the thickness direction of the cushion stone 19 in a detachable manner to limit the thickness direction of the cushion stone 19, thereby limiting the relative displacement of the cushion stone 19 and the overturning blocks 11 in the thickness direction during the overturning process, two groups of positioning sheets 13 are respectively located on the two sides of the overturning blocks 11 corresponding to the width direction of the cushion stone 19 and extend to the side surface of the cushion stone 19 to limit the width direction of the cushion stone 19, thereby limiting the relative displacement of the cushion stone 19 and the overturning blocks 11 in the width direction during the overturning process, and the overturning handle 14 is in transmission connection with the hinged shaft 10 corresponding to any one of the overturning blocks 11 to overturn the cushion stone 19; in this embodiment, the handle can be in transmission with the hinged shaft 10 corresponding to the overturning block 11 through chain transmission or gear transmission. Preferably, the overturning blocks 11 are adapted to the cross section of the cushion stone 19, each group of positioning rods 12 has two positioning rods 12, the two positioning rods 12 are respectively located on the two sides of the overturning blocks 11 and are fixedly connected with the overturning blocks 11 through bolts; each group of positioning sheets 13 has two positioning sheets 13, the two positioning sheets 13 are respectively located on the two overturning blocks 11 and are fixedly connected with the overturning blocks 11 through bolts.

[0059] In an optional embodiment, the hoisting tool 17 comprises two main frames and two auxiliary frames, the main frame and the auxiliary frame are both I-shaped steel, the two main frames and the two auxiliary frames are in butt joint to form a square truss corresponding to the cushion stone 19, specifically, the two auxiliary frames are connected in parallel between the two main frames, the two main frames are respectively provided with lifting lugs 26 at the two ends for cooperating with the crane to hoist and transport the cushion stone 19, the two main frames are respectively provided with a third slot corresponding to the lifting transmission rod 20 and extending along the length direction of the main frame, the two main frames are respectively provided with locking seats 27 which are slidably assembled along the length direction of the main frame, the lifting transmission rod 20 passes through the third slot of the locking seat 27, the middle part of the locking seat 27 is provided with a through hole corresponding to the lifting transmission rod 20, and the lifting transmission rod 20 is correspondingly connected with a locking mechanism after passing through the locking seat 27 to lock the lifting transmission rod 20, so that the hoisting tool 17 is lifted to hoist and transport the cushion stone 19.

[0060] In an optional embodiment, the lifting transmission rod 20 is a U-shaped piece, the two ends of each U-shaped piece respectively extend with two lifting holes 6 corresponding to the cushion stone 19 and the lifting transmission rod 20, so as to fix the cushion stone 19 and the lifting transmission rod 20. Alternatively, the lifting hole 6 pre-embedded part is a pre-embedded nut with an internal thread, and the lifting transmission rod 20 is in threaded connection with the internal hole of the lifting hole 6 pre-embedded part.

[0061] In an optional embodiment, the driving rod 22 is arranged between the two lifting lugs 26 and the locking seat 27 of the same main frame to drive the locking seat 27 to slide along the length direction of the main frame, wherein the driving rod 22 can be a pneumatic cylinder or a manual jack, and the side of the lifting lug 26 can be provided with a baffle corresponding to the driving rod 22, so as to drive the locking seat 27 to displace along the corresponding main frame, thereby adjusting the position of the cushion stone 19 along the third slot, and in the embodiment, a sliding groove corresponding to the main frame is arranged below the locking seat 27, so as to realize the sliding assembly.

[0062] In an optional embodiment, the locking mechanism comprises a support plate 18, a nut, and a lifting rod 21, wherein the middle part of the support plate 18 is provided with a through hole corresponding to the lifting transmission rod 20, the lifting transmission rod 20 passes through the support plate 18 and is threadedly connected with the nut, the nut is larger than the through hole and can be blocked above the support plate 18, so as to realize the locking of the cushion stone 19, and the two ends of each support plate 18 are supported on the locking seat 27 by two lifting rods 21 to level the cushion stone 19, and when leveling is needed, the height of the lifting rod 21 can be adjusted as needed to realize the leveling of the cushion stone 19, and the driving rod 22 can be a pneumatic cylinder or a manual jack.

[0063] In an optional embodiment, the positioning support comprises a positioning framework 16 and a positioning pin 23, the positioning framework 16 is a square frame corresponding to the lifting tool 17, and the positioning framework 16 is welded by an I-beam, so as to have high strength, and the two ends of the main frame of the lifting tool 17 are placed above the positioning framework 16, because the two ends of the main frame of the lifting tool 17 respectively extend to the two sides of the two auxiliary frames, so that after the cushion stone 19 is lifted, the two ends of the main frame corresponding to the positioning framework 16 can be placed on the positioning framework 16 and will not interfere with the movement of the cushion stone 19 in the longitudinal direction, wherein the positioning framework 16 is provided below with a supporting leg connected with the pier body template 15 by a bolt, the rib plate is welded on the pier body template 15 along the position of the supporting leg for reinforcement, the positioning pin 23 is threadedly connected with the positioning framework 16, a plurality of positioning pins 23 are distributed in the circumferential direction of the positioning framework 16 and extend into the inside of the positioning framework 16 to abut against the side surface of the cushion stone 19, so as to limit the circumferential position of the cushion stone 19, and avoid the shaking of the cushion stone 19 during pouring, thereby improving the pouring effect.

[0064] In an optional embodiment, the hoisting tool 17 is slidingly assembled on the corresponding frame of the positioning framework 16, and two protrusions corresponding to the frame of the positioning framework 16 can be arranged on the bottom surface of the hoisting tool 17 to achieve the sliding assembly. The two ends of the frame of the positioning framework 16 corresponding to the hoisting tool 17 are provided with adjusting rods 24, and the adjusting rods 24 drive the hoisting tool 17 to slide along the frame of the positioning framework 16. The adjusting rod 24 can be a pneumatic cylinder or a manual jack, so that the position of the cushion stone 19 can be adjusted in three dimensions of front and back, left and right, up and down, and the position of the prefabricated cushion stone 19 can be accurately adjusted to meet the design requirements.

[0065] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application is within the protection scope of the claims of the present application.

Claims

1. A construction method for a bridge precast abutment cushion stone, characterized by, The method comprises the following steps: S1, placing a prefabricated formwork horizontally at a prefabrication site, binding anchoring steel bars after installing a cushion stone steel bar positioning fixture in the prefabricated formwork, arranging anchor bolt hole embedded parts and lifting hole embedded parts in the prefabricated formwork, and then pouring concrete to prefabricate the cushion stone; S2, removing the formwork after the cushion stone reaches a predetermined strength and curing; S3, transporting the cushion stone to the site, hoisting it onto a turnover support, and turning over the cushion stone to make the anchoring steel bars on the cushion stone face downward and the anchor bolt holes face upward; S4, hoisting the positioning support to the top of a pier of a bridge support, and connecting the positioning support with a pier body formwork; S5, installing lifting transmission bars that can pass through the reserved holes of the lifting tool in the four lifting holes of the cushion stone, hoisting the cushion stone to the positioning support through the lifting tool, and then aligning and leveling the cushion stone after hoisting is completed; S6, binding anti-cracking steel bars around the cushion stone, and then pouring concrete for the pier body of the bridge support to integrate the cushion stone with the bridge support. The lifting tool comprises two main frames and two auxiliary frames, the two main frames and the two auxiliary frames are mutually butted to form a square truss corresponding to the cushion stone, and lifting lugs are arranged at the two ends of the two main frames. A third slot corresponding to the lifting transmission bar is arranged on the two main frames, a locking seat is arranged on the two main frames, the locking seat is slidably assembled along the length direction of the main frame, a through hole corresponding to the lifting transmission bar is arranged in the middle of the locking seat, and the lifting transmission bar is correspondingly connected with a locking mechanism after passing through the locking seat. The locking mechanism comprises: a support plate, a through hole corresponding to the lifting transmission bar is arranged in the middle of the support plate; a nut, the lifting transmission bar passes through the support plate and is threadedly connected with the nut, so that the lifting transmission bar is blocked above the support plate by the nut; a lifting rod, the two ends of each support plate are supported on the locking seat through two lifting rods to level the cushion stone. The positioning support comprises: a positioning framework, the positioning framework is a square frame corresponding to the lifting tool, the two ends of the lifting tool main frame are placed above the positioning framework, and supporting legs connected with the pier body formwork through bolts are arranged below the positioning framework; a positioning pin, the positioning pin is screw-connected with the positioning framework, a plurality of positioning pins are uniformly distributed in the circumferential direction of the positioning framework and extend into the inside of the positioning framework to abut against the side surface of the cushion stone to circumferentially position the cushion stone; the lifting tool is slidably assembled on the corresponding edge frame of the positioning framework, adjusting rods are arranged at the two ends of the edge frame of the corresponding lifting tool of the positioning framework, and the adjusting rods drive the lifting tool to slide along the edge frame of the positioning framework.

2. The construction method of a bridge precast abutment cushion stone according to claim 1, characterized in that, The prefabricated formwork comprises a bottom formwork and side formworks, a plurality of side formworks are spliced above the bottom formwork, a steel bar positioning fixture is arranged on the inner side of the side formwork, and an anchor bolt hole embedded part extends into the inside of the prefabricated formwork through a position adjusting frame. First, the bottom formwork is horizontally checked, the side formwork is installed after horizontal checking of the bottom formwork is completed, the side formwork and the bottom formwork are connected through bolts, and the steel bar positioning fixture and the side formwork are connected through bolts.

3. The bridge prefabricated support cushion stone construction method according to claim 2, characterized in that, The adjusting frame is a frame fixed on the upper surface of the side mold, and two adjusting arms are arranged in the adjusting frame, each adjusting arm is provided with two first strip holes extending along the length direction of the adjusting arm, and the anchor hole embedded part is arranged in the first strip hole to adjust the position of the anchor hole embedded part in the first direction; A second strip hole perpendicular to the first strip hole is arranged on the adjusting frame corresponding to the two ends of the adjusting arm, and the two adjusting arms slide in the second strip hole to adjust the position of the anchor hole embedded part in the second direction.

4. The construction method of a bridge precast abutment cushion stone according to claim 1, characterized in that, After the cushion stone is maintained, the outer surface of the cushion stone is chiseled in the range corresponding to the bridge support; The distance between the anti-cracking steel bars and the outer circumferential surface of the cushion stone is 5 cm; Before pouring the pier body concrete, the cushion stone is wetted as a whole, and the positioning support can be removed after the pouring of the pier body concrete is completed and the design strength is reached.

5. The bridge precast bent cap construction method of claim 1, wherein The turnover support comprises: The turnover seat has a hinge seat upwardly protruding from each of the opposite sides of the turnover seat; Two turnover blocks are hingedly connected to the hinge seats by hinge shafts, and the distance between the two turnover blocks is adapted to the length of the cushion stone; Two groups of positioning rods are detachably installed on the two sides of the turnover blocks in the thickness direction of the cushion stone to limit the thickness direction of the cushion stone; Two groups of positioning pieces are located on the two sides of the turnover blocks in the width direction of the cushion stone and extend to the side surface of the cushion stone to limit the width direction of the cushion stone; A turnover handle is drivingly connected to the hinge shaft corresponding to any one of the turnover blocks to turn over the cushion stone.

6. The bridge precast bent cap construction method of claim 1, wherein A driving rod is arranged between each of the two lifting lugs and the locking seat of the same main frame to drive the locking seat to slide along the length direction of the main frame.

Images