Automatic trimming apparatus for reserved hole of fully-prefabricated bridge, and construction method

Abstract

Disclosed in the present invention are an automatic trimming apparatus for a reserved hole of a fully-prefabricated bridge, and a construction method. The automatic trimming apparatus comprises a first mounting base and a second mounting base, wherein four groups of mounting cylinders are fixedly connected to the upper portion of the first mounting base, a second lead screw is rotatably connected to the upper portion of each mounting cylinder, the top end of each second lead screw penetrates through the first mounting base and is fixedly connected to a second rotating cap, the bottom end of each second lead screw is rotatably connected to the first mounting base, a lifting base is in threaded connection with the outer side of each second lead screw, two groups of push rods are fixedly connected to the bottom end of each lifting base, the lower portion of each push rod penetrates through the first mounting base and is fixedly connected to a corresponding fixing base, a connecting sheet is fixedly connected inside each fixing base, a connecting shaft is fixedly connected inside each connecting sheet, connecting blocks are rotatably connected to two ends of each connecting shaft, and a supporting foot is fixedly connected to the bottom of each connecting block, such that it is ensured that when the inside of a hole is cleaned, a cleaning device can be fixed on the outer side of the hole on the basis of the slope of surroundings, thereby ensuring that a drill bit can vertically clean the hole across its inner diameter.

Description

Full assembly type bridge reserved hole automatic trimming device and construction method TECHNICAL FIELD

[0001] The present application relates to the field of bridge construction technology, in particular to a full assembly type bridge reserved hole automatic trimming device and construction method. BACKGROUND

[0002] The full assembly type bridge is a new modern bridge construction method. Compared with the traditional bridge construction method, the assembly type bridge adopts the prefabricated component method, that is, part or all of the components of the lower structure (such as pier column, pile cap, capping beam), upper structure (such as box girder, plate girder, T girder) and accessory structure (anti-collision curbstone, guardrail) of the bridge are processed and formed in the prefabricated component factory. These prefabricated components are then transported to the construction site and assembled into the bridge body by hoisting and splicing.

[0003] During the installation, connection, grouting and pouring of the prefabricated components of the assembly type bridge, the reserved holes will inevitably be infiltrated with concrete or grouting material. After the concrete or grouting material in the hole solidifies, it will affect the installation quality of the bridge prefabricated component. Therefore, a hole trimming device is needed to trim the reserved hole. The existing hole trimming device is operated by the construction worker holding an electric drill. The stability, accuracy and processing depth of the operation process are difficult to control, which can easily damage the reserved hole or result in substandard processing quality. In addition, due to the unevenness of the hole reserved position surface, the fixing surface may not be flat, and the penetrating stability device cannot guarantee the stability of the device. SUMMARY

[0004] The purpose of the present application is to provide a full assembly type bridge reserved hole automatic trimming device and construction method to solve the problems raised in the background.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a full assembly type bridge reserved hole automatic trimming device and construction method, comprising a first mounting seat and a second mounting seat, four groups of mounting cylinders are fixedly connected to the upper part of the first mounting seat, a second lead screw is rotatably connected to the upper part of the mounting cylinder, a second rotating cap is fixedly connected to the top end of the second lead screw penetrating the first mounting seat, the bottom end of the second lead screw is rotatably connected with the first mounting seat, a lifting seat is screw connected to the outer side of the second lead screw, two groups of push rods are fixedly connected to the bottom end of the lifting seat, a fixed seat is fixedly connected to the lower part of the push rod penetrating the first mounting seat, a connecting plate is fixedly connected inside the fixed seat, a connecting shaft is fixedly connected inside the connecting plate, connecting blocks are rotatably connected to both ends of the connecting shaft, and support feet are fixedly connected to the bottom of the connecting blocks.

[0006] Preferably, the front end of the connecting shaft penetrates the connecting block and is fixedly connected with a square block, one end of the square block is fixedly connected with a first fixed sheet, the outer side of the square block is slidably connected with a moving sheet, one side of the moving sheet facing the connecting block is fixedly connected with a gear ring, and the side of the connecting block facing the moving sheet is provided with a gear groove matched with the gear ring.

[0007] Preferably, one end of the moving sheet away from the connecting block is fixedly connected with a first spring, the first spring is sleeved on the outer side of the square block, the other end of the first spring is fixedly connected with the first fixed sheet, and the outer side of the moving sheet is fixedly connected with two groups of pulling sheets.

[0008] Preferably, a communication hole is formed in the middle of the first mounting seat, four groups of fixed plates are fixedly connected to the upper part of the first mounting seat, a first screw rod is threadedly connected in the fixed plate, a first rotating cap is fixedly connected to one end of the first screw rod away from the communication hole, a clamping plate is rotatably connected to the other end of the first screw rod, two groups of sliding rods are fixedly connected to one side of the clamping plate away from the communication hole, and first limiting sheets are fixedly connected to the other ends of the sliding rods penetrating the fixed plates.

[0009] Preferably, the supporting feet and the clamping plate are provided with friction lines on one side.

[0010] Preferably, two groups of lifting rods are fixedly connected to the upper part of the first mounting seat on both sides, second limiting sheets are fixedly connected to the upper part of the lifting rods, a lifting plate is slidably connected to the outer side of the lifting rod, a mounting seat is fixedly connected to the lower part of the lifting plate, a motor is fixedly connected to the upper part of the mounting seat, a rotating shaft is fixedly connected to the output end of the motor penetrating the mounting seat, a mounting ring is fixedly connected to the lower part of the rotating shaft, an installation groove is formed in the upper part of the second mounting seat, the mounting ring is slidably connected in the installation groove, the height of the installation groove is greater than the thickness of the mounting ring, a limiting groove in communication with the installation groove is formed in the upper part of the second mounting seat, limiting blocks are fixedly connected to the lower part of the rotating shaft on both sides, the limiting blocks are slidably connected in the limiting groove, four groups of sliding rails are fixedly connected to the lower part of the second mounting seat, and four groups of sliding supporting feet are slidably connected to the lower part of the sliding rails.

[0011] Preferably, a third spring is fixedly connected to the lower part of the lifting plate, the third spring is sleeved on the outer side of the lifting rod, the bottom end of the third spring is fixedly connected with the first mounting seat, locking grooves are formed in the upper part of the lifting rod on both sides, and a locking rod matched with the locking grooves is slidably connected in the lifting plate, pulling handles are fixedly connected to the front and rear sides of the lifting plate.

[0012] Preferably, a second fixed sheet is fixedly connected to one side of the locking rod away from the lifting plate, a second spring is fixedly connected to one side of the second fixed sheet close to the lifting plate, the second spring is sleeved on the outer side of the locking rod, and the other end of the second spring is fixedly connected with the lifting plate.

[0013] Preferably, the second mounting seat middle part is rotationally connected with a rotating sheet, four groups of rotating grooves are formed in the lower part of the rotating sheet, the upper part of the sliding support leg is fixedly connected with a connecting rod, the connecting rod is slidingly connected in the rotating groove, the upper part of the rotating sheet is fixedly connected with a connecting column, the outer side of the upper part of the connecting column is fixedly connected with two groups of rotating rods, two groups of communication grooves are formed in the outer side of the rotating shaft, the rotating rods are rotationally connected with the communication grooves, the height of the communication grooves is greater than the diameter of the rotating rods, the outer side of the upper part of the connecting column is fixedly connected with an internal tooth ring, and the lower part of the rotating shaft is internally and fixedly connected with an external tooth ring matched with the internal tooth ring.

[0014] Compared with the prior art, the beneficial effects of the present application are: 1. The leveling and fixing device is arranged below the device, so that the device can adapt to uneven fixed surfaces, is firmly fixed to the fixed surface, and the drill bit can vertically enter the hole for cleaning, thereby avoiding damage to the hole.

[0015] 2. The cooperation of the communication hole, the first rotating cap, the first lead screw, the clamping plate, the first mounting seat, the second rotating cap, the second lead screw, the lifting seat, the push rod, the fixing seat, the connecting block, the rotating shaft, the supporting leg, the gear ring, the gear groove, the first spring and the moving sheet is used to sleeve the hole outside in the communication hole, rotate the first rotating cap, drive the clamping plate to move through the rotation of the first lead screw, fix the outer edge of the hole, ensure that the first mounting seat is perpendicular to the hole, rotate the second rotating cap, drive the lifting seat to move up and down through the rotation of the second lead screw, drive the fixing seat to move up and down through the push rod, rotate the connecting block around the rotating shaft, change the inclination angle of the supporting leg, insert the gear ring into the gear groove, so that the connecting block cannot rotate, thereby fixing the angle of the supporting leg, and the first spring drives the moving sheet to make the gear ring cannot be separated from the gear groove, so that the cleaning device can be fixed outside the hole according to the slope of the environment when cleaning the inside of the hole, the drill bit can vertically clean the inside diameter of the hole, and the drill bit deviation is prevented from causing damage to the hole; 3. The cooperation of the second mounting seat, the external tooth ring, the internal tooth ring, the rotating rod, the connecting column, the rotating sheet, the connecting rod, the rotating groove, the sliding support leg and the sliding rail is used to push the second mounting seat upwards, so that the external tooth ring is separated from the internal tooth ring, drive the connecting column to rotate through the rotating rod, rotate the rotating sheet, move the connecting rod along the rotating groove, drive the sliding support leg to move along the sliding rail, realize the folding and unfolding of the sliding support leg, the second mounting seat falls due to gravity, the external tooth ring and the internal tooth ring are in close contact, the rotation of the rotating sheet is fixed, different diameter drill bits can be installed, and different caliber processing can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a first perspective view of the present application; Fig. 2 is a second perspective view of the second mounting seat structure; Fig. 3 is a third perspective view of the sliding support leg structure; Fig. 4 is a fourth perspective view of the mounting cylinder structure; Fig. 5 is a fifth perspective view of the connecting block structure; Fig. 6 is a sixth perspective view of the lifting rod structure.

[0017] In the figure: 1, first mounting seat; 2, communication hole; 3, fixed plate; 4, first lead screw; 5, clamping plate; 6, first rotating cap; 7, sliding rod; 8, first limiting piece; 9, mounting cylinder; 10, second rotating cap; 11, second lead screw; 12, lifting seat; 13, push rod; 14, fixed seat; 15, connecting piece; 16, connecting shaft; 17, connecting block; 18, square block; 19, first fixed piece; 20, moving piece; 21, first spring; 22, gear ring; 23, pulling piece; 24, gear groove; 25, support leg; 26, friction lines; 27, lifting rod; 28, second limiting piece; 29, lifting plate; 30, locking groove; 31, locking rod; 32, second fixed piece; 33, second spring; 34, third spring; 35, pulling handle; 36, mounting seat; 37, motor; 38, rotating shaft; 39, mounting ring; 40, second mounting seat; 41, mounting groove; 42, limiting groove; 43, limiting block; 44, communication groove; 45, outer gear ring; 46, connecting column; 47, inner gear ring; 48, rotating rod; 49, rotating piece; 50, rotating groove; 51, sliding rail; 52, sliding support leg; 53, connecting rod. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] Referring to FIG. 1-6, the present application provides a technical solution: full assembly type bridge reserved hole automatic trimming equipment and construction method, including first mounting seat 1, second mounting seat 40, four groups of installation cylinder 9 are fixedly welded on the upper portion of first mounting seat 1, second lead screw 11 is rotatably installed on the upper portion of installation cylinder 9, second rotating cap 10 is fixedly welded on the top end of second lead screw 11 penetrating first mounting seat 1, second lead screw 11 is rotatably connected with first mounting seat 1 at the bottom end, lifting seat 12 is screwedly installed on the outer side of second lead screw 11, two groups of push rods 13 are fixedly welded on the bottom end of lifting seat 12, fixed seat 14 is fixedly welded on the lower portion of push rod 13 penetrating first mounting seat 1, by rotating second rotating cap 10, second lead screw 11 is rotated to drive lifting seat 12 to move up and down, fixed seat 14 is driven to move up and down by push rod 13, connecting piece 15 is fixedly welded in fixed seat 14, connecting shaft 16 is fixedly welded in connecting piece 15, connecting block 17 is rotatably installed at the two ends of connecting shaft 16, support leg 25 is fixedly welded on the bottom of connecting block 17, by rotating connecting block 17 around connecting shaft 16, the inclination angle of support leg 25 is changed; square block 18 is fixedly welded on the front end of connecting shaft 16 penetrating connecting block 17, first fixing piece 19 is fixedly welded on the other end of square block 18, moving piece 20 is slidably connected on the outer side of square block 18, gear ring 22 is fixedly welded on the side of moving piece 20 facing connecting block 17, gear groove 24 is formed on the side of connecting block 17 facing moving piece 20, by inserting gear ring 22 into gear groove 24, connecting block 17 cannot rotate, so that the angle of support leg 25 is fixed; first spring 21 is fixedly welded on the end of moving piece 20 away from connecting block 17, first spring 21 is sleeved on the outer side of square block 18, the other end of first spring 21 is fixedly welded with first fixing piece 19, two groups of pulling pieces 23 are fixedly welded on the outer side of moving piece 20, first spring 21 pushes moving piece 20, so that gear ring 22 cannot be separated from gear groove 24; through hole 2 is formed in the middle of first mounting seat 1, four groups of fixed plates 3 are fixedly welded on the upper portion of first mounting seat 1, first lead screw 4 is screwedly installed in fixed plate 3, first rotating cap 6 is fixedly welded on the end of first lead screw 4 away from through hole 2, clamping plate 5 is rotatably connected with the other end of first lead screw 4, two groups of sliding rods 7 are fixedly welded on the side of clamping plate 5 away from through hole 2, first limiting piece 8 is fixedly welded on the other end of sliding rod 7 penetrating fixed plate 3, by rotating first rotating cap 6, first lead screw 4 is rotated to drive clamping plate 5 to move, the outer edge of hole is fixed, it is guaranteed that first mounting seat 1 is perpendicular to hole; friction lines 26 are formed on one side of support leg 25 and clamping plate 5, the friction is increased;The first mounting seat 1 upper portion both sides are fixedly welded with two groups of lifting rods 27, the lifting rod 27 upper portion is fixedly welded with second limiting sheet 28, the lifting rod 27 outside is slidably installed with lifting plate 29, the lifting plate 29 lower portion is fixedly welded with mounting seat 36, the mounting seat 36 upper portion flange is installed with motor 37, the motor 37 output end penetrates the mounting seat 36 coupling and is connected with rotating shaft 38, the rotating shaft 38 lower portion is fixedly welded with mounting ring 39, the second mounting seat 40 upper portion is set with installation groove 41, the mounting ring 39 is slidably installed in installation groove 41 inside, the installation groove 41 height is greater than the thickness of mounting ring 39, the second mounting seat 40 upper portion is set with the limiting slot 42 that communicates with installation groove 41, the rotating shaft 38 lower portion is fixedly welded with limiting block 43 on both sides, the limiting block 43 is slidably installed in limiting slot 42 inside, guarantee rotating shaft 38 rotation through limiting block 43 and limiting slot 42 drive second mounting seat 40 rotation, the second mounting seat 40 lower portion is fixedly welded with four groups of slide rails 51, the slide rail 51 lower portion is slidably installed with four groups of sliding feet 52, the sliding feet 52 inside are fixed to different drill bits, the motor 37 is driven through rotating shaft 38 and drives second mounting seat 40 rotation, through sliding feet 52 drive drill bit rotation, along lifting rod 27 and press down lifting plate 29, the drill bit is cleaned to the hole inside;The lifting plate 29 lower portion is fixedly welded with third spring 34, the third spring 34 is sleeved on the outside of lifting rod 27, and the bottom end of the third spring 34 is fixedly welded with the first mounting seat 1, which forms resistance to the downward pressure of the lifting plate 29, prevents the downward pressure from being too large, the lifting rod 27 upper portion both sides are set with locking groove 30, the lifting plate 29 inside is slidably installed with locking rod 31 matched with locking groove 30, the position of the lifting plate 29 is fixed, the lifting plate 29 front and rear sides are fixedly welded with pull handle 35, which facilitates the downward pressure of the lifting plate 29;The locking rod 31 side away from the lifting plate 29 is fixed with second fixed sheet 32, the second fixed sheet 32 side close to the lifting plate 29 is fixedly welded with second spring 33, the second spring 33 is sleeved on the outside of locking rod 31, and the other end of the second spring 33 is fixedly welded with the lifting plate 29, the second spring 33 is fixed in locking groove 30 by pulling second fixed sheet 32, so that the locking rod 31 is fixed in the locking groove 30.The rotating piece 49 is rotatably arranged in the middle of the second mounting base 40, four groups of rotating grooves 50 are formed in the lower part of the rotating piece 49, the upper part of the sliding supporting leg 52 is fixedly welded with a connecting rod 53, the connecting rod 53 is slidably arranged in the rotating groove 50, the upper part of the connecting column 46 is fixedly welded with two groups of rotating rods 48, two groups of communication grooves 44 are formed in the outer side of the rotating shaft 38, the rotating rods 48 are rotatably connected with the communication grooves 44, the height of the communication groove 44 is greater than the diameter of the rotating rod 48, the outer side of the upper part of the connecting column 46 is fixedly welded with an inner tooth ring 47, the lower part of the rotating shaft 38 is fixedly welded with an outer tooth ring 45 matched with the inner tooth ring 47, the outer tooth ring 45 is separated from the inner tooth ring 47 by pushing the second mounting base 40 upward, the connecting column 46 is rotated by the rotating rod 48, the rotating piece 49 is rotated to make the rotating piece 49 rotate, the connecting rod 53 moves along the rotating groove 50 to drive the sliding supporting leg 52 to move along the sliding rail 51, the sliding supporting leg 52 is retracted and extended, the outer tooth ring 45 and the inner tooth ring 47 are matched due to the gravity of the second mounting base 40, and the rotation of the rotating piece 49 is fixed.

[0020] The working process of the present application is as follows: when the present application is used, the hole outside is sleeved in the communication hole 2, the first rotating cap 6 is rotated, the first screw rod 4 is rotated to drive the clamping plate 5 to move, the hole outside is fixed, the first mounting base 1 is guaranteed to be perpendicular to the hole, the second rotating cap 10 is rotated, the second screw rod 11 is rotated to drive the lifting seat 12 to move up and down, the fixed seat 14 is driven to move up and down by the pushing rod 13, the connecting block 17 is rotated around the connecting shaft 16, the inclination angle of the supporting leg 25 is changed, the angle of the supporting leg 25 is fixed by inserting the gear ring 22 into the gear groove 24, the connecting block 17 cannot rotate, the first spring 21 drives the moving piece 20 to move, the gear ring 22 cannot be separated from the gear groove 24, the motor 37 drives the second mounting base 40 to rotate through the rotating shaft 38, the drill bit is rotated by the sliding supporting leg 52, the lifting plate 29 is pressed downward along the lifting rod 27, the drill bit cleans the inside of the hole, the outer tooth ring 45 is separated from the inner tooth ring 47 by pushing the second mounting base 40 upward, the connecting column 46 is rotated by the rotating rod 48, the rotating piece 49 is rotated to make the rotating piece 49 rotate, the connecting rod 53 moves along the rotating groove 50 to drive the sliding supporting leg 52 to move along the sliding rail 51, the sliding supporting leg 52 is retracted and extended, the outer tooth ring 45 and the inner tooth ring 47 are matched due to the gravity of the second mounting base 40, the rotation of the rotating piece 49 is fixed, and drill bits with different diameters can be installed.

[0021] The preferred embodiments of the present application are described above, but the present application is not limited to the above-mentioned embodiments, and those skilled in the art can understand that the embodiments can be changed, modified, replaced and changed in various ways without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A full assembly type bridge preformed hole automatic finishing equipment and construction method, comprising a first mounting seat (1) and a second mounting seat (40), characterized in that: The upper part of the first mounting seat (1) is fixedly connected with four groups of mounting barrels (9), the upper part of the mounting barrel (9) is rotatably connected with a second lead screw (11), the top end of the second lead screw (11) penetrates the first mounting seat (1) and is fixedly connected with a second rotating cap (10), the bottom end of the second lead screw (11) is rotatably connected with the first mounting seat (1), the outer side of the second lead screw (11) is threadedly connected with a lifting seat (12), the bottom end of the lifting seat (12) is fixedly connected with two groups of push rods (13), the lower part of the push rod (13) penetrates the first mounting seat (1) and is fixedly connected with a fixed seat (14), the inside of the fixed seat (14) is fixedly connected with a connecting piece (15), the inside of the connecting piece (15) is fixedly connected with a connecting shaft (16), both ends of the connecting shaft (16) are rotatably connected with a connecting block (17), and the bottom of the connecting block (17) is fixedly connected with a supporting leg (25). 2.The full-precast bridge preformed hole automatic trimming device and construction method according to claim 1, characterized in that: The front end of the connecting shaft (16) penetrates the connecting block (17) and is fixedly connected with a square block (18), the other end of the square block (18) is fixedly connected with a first fixed piece (19), the outer side of the square block (18) is slidably connected with a moving piece (20), one side of the moving piece (20) facing the connecting block (17) is fixedly connected with a gear ring (22), and one side of the connecting block (17) facing the moving piece (20) is provided with a gear groove (24) matched with the gear ring (22). 3.The full-preassembled bridge preformed hole automatic trimming device and construction method of claim 2, wherein: One end of the moving piece (20) away from the connecting block (17) is fixedly connected with a first spring (21), the first spring (21) is sleeved on the outer side of the square block (18), the other end of the first spring (21) is fixedly connected with the first fixed piece (19), and the outer side of the moving piece (20) is fixedly connected with two groups of pulling pieces (23).

4. The full-precast bridge preformed hole automatic trimming device and construction method according to claim 1, characterized in that: A communication hole (2) is formed in the middle of the first mounting seat (1), four groups of fixed plates (3) are fixedly connected to the upper part of the first mounting seat (1), a first lead screw (4) is threadedly connected in the fixed plate (3), a first rotating cap (6) is fixedly connected to one end of the first lead screw (4) away from the communication hole (2), a clamping plate (5) is rotatably connected to the other end of the first lead screw (4), two groups of sliding rods (7) are fixedly connected to one side of the clamping plate (5) away from the communication hole (2), and a first limiting piece (8) is fixedly connected to the other end of the sliding rod (7) and penetrates the fixed plate (3).

5. The full-precast bridge preformed hole automatic trimming device and construction method according to claim 4, characterized in that: The supporting leg (25) and one side of the clamping plate (5) are provided with friction lines (26).

6. The full-precast bridge preformed hole automatic trimming device and construction method according to claim 1, characterized in that: The upper two sides of the first mounting seat (1) are fixedly connected with two groups of lifting rods (27), the upper part of the lifting rod (27) is fixedly connected with a second limiting sheet (28), the outer side of the lifting rod (27) is slidably connected with a lifting plate (29), the lower part of the lifting plate (29) is fixedly connected with a mounting seat (36), the upper part of the mounting seat (36) is fixedly connected with a motor (37), the output end of the motor (37) penetrates the mounting seat (36) and is fixedly connected with a rotating shaft (38), the lower part of the rotating shaft (38) is fixedly connected with a mounting ring (39), the upper part of the second mounting seat (40) is provided with a mounting groove (41), the mounting ring (39) is slidably connected in the mounting groove (41), the height of the mounting groove (41) is greater than the thickness of the mounting ring (39), the upper part of the second mounting seat (40) is provided with a limiting groove (42) in communication with the mounting groove (41), the lower part of the rotating shaft (38) is fixedly connected with a limiting block (43) on the two sides, the limiting block (43) is slidably connected in the limiting groove (42), and the lower part of the second mounting seat (40) is fixedly connected with four groups of sliding rails (51). The lower part of the lifting plate (29) is fixedly connected with a third spring (34), the third spring (34) is sleeved on the outer side of the lifting rod (27), the bottom end of the third spring (34) is fixedly connected with the first mounting seat (1), the upper part of the lifting rod (27) is provided with a locking groove (30) on the two sides, and the inside of the lifting plate (29) is slidably connected with a locking rod (31) matched with the locking groove (30). The lifting plate (29) is fixedly connected with a pulling handle (35) on the front and rear sides.

7. The full-precast bridge preformed hole automatic trimming device and construction method according to claim 6, characterized in that: The side, away from the lifting plate (29), of the locking rod (31) is fixedly connected with a second fixed sheet (32), the side, close to the lifting plate (29), of the second fixed sheet (32) is fixedly connected with a second spring (33), the second spring (33) is sleeved on the outer side of the locking rod (31), and the other end of the second spring (33) is fixedly connected with the lifting plate (29). 8.The full-pre-assembled bridge preformed hole automatic trimming device and construction method of claim 7, wherein: The middle part of the second mounting seat (40) is rotatably connected with a rotating sheet (49), the lower part of the rotating sheet (49) is provided with four groups of rotating grooves (50), the upper part of the sliding support leg (52) is fixedly connected with a connecting rod (53), the connecting rod (53) is slidably connected in the rotating groove (50), the upper part of the rotating sheet (49) is fixedly connected with a connecting column (46), the outer side of the upper part of the connecting column (46) is fixedly connected with two groups of rotating rods (48), the outer side of the rotating shaft (38) is provided with two groups of communicating grooves (44), the rotating rod (48) is rotatably connected in the communicating groove (44), the height of the communicating groove (44) is greater than the diameter of the rotating rod (48), the outer side of the upper part of the connecting column (46) is fixedly connected with an inner tooth ring (47), and the lower part of the rotating shaft (38) is internally and fixedly connected with an outer tooth ring (45) matched with the inner tooth ring (47). 9.The full-pre-assembled bridge pre-formed hole automatic trimming device and construction method of claim 7, wherein: ​

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