CN113737628A

CN113737628A - Double-semi-directional ramp steel box girder for municipal engineering bridge construction and construction process

Info

Publication number: CN113737628A
Application number: CN202111156239.4A
Authority: CN
Inventors: 李峰; 李辉彬; 庞广明; 徐伟; 郇恒迁
Original assignee: Linyi Municipal Group Co Ltd
Current assignee: Linyi Municipal Group Co Ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2021-12-03
Anticipated expiration: 2041-09-29
Also published as: CN113737628B

Abstract

The invention discloses a double-semi-directional ramp steel box girder for municipal engineering bridge construction, which comprises a steel box girder I, an auxiliary cross beam II, a steel box girder II, a supporting plate, an auxiliary supporting mechanism I, a damping mechanism, an auxiliary supporting mechanism II and a maintenance opening plugging mechanism; the auxiliary cross beam I is arranged on one side of the steel box girder I; the auxiliary cross beam II is arranged on one side of the steel box girder II; the supporting plate, the auxiliary supporting mechanism I, the damping mechanism and the auxiliary supporting mechanism II are sequentially arranged in the steel box girder II; the internal structures of the steel box girder I and the steel box girder II are the same; the auxiliary cross beam I and the auxiliary cross beam II have the same structure; the maintenance port plugging mechanism is arranged at the bottom of the steel box girder II; a plurality of longitudinal rib plates I and transverse rib plates are arranged at the bottom of the auxiliary cross beam I. The auxiliary supporting mechanism I, the auxiliary supporting mechanism II, the supporting plate and the damping mechanism are fixed at intervals, so that the damping and weight-reducing effects are realized under the condition of ensuring the stable structure.

Description

Double-semi-directional ramp steel box girder for municipal engineering bridge construction and construction process

Technical Field

The invention belongs to the technical field of bridge construction, and particularly relates to a double-semi-directional ramp steel box girder for municipal engineering bridge construction and a construction process.

Background

The steel box girder is one of the main application structural forms of the large-span bridge, and is called as the steel box girder because the main body of the shell is similar to a box body; wherein the cross section of the steel box girder is a flat and wide trapezoidal section; because of the convenient manufacture, the elevated roads in the urban area are usually built with steel box girders to build ring ramps; there are some problems that are inevitable:

1) the steel plates are mostly used for welding and supporting the steel box girder, and the supporting steel plates penetrate through the whole steel box girder, so that the steel consumption is large, the weight of the steel box girder is easy to be too heavy, the installation and operation are inconvenient, and the structural deformation is easy to occur under the condition of long-time application;

2) the interior of the steel box girder is mostly of a welded rigid connecting structure, so that effective shock absorption cannot be performed when strong shock is applied, the shock absorption effect of the interior of the steel box girder is poor, and the rigid structure is easily damaged for a long time;

therefore, a steel box girder is required to have a shock-absorbing effect and a stable structure in its inner structure.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a double-semi-directional ramp steel box girder for municipal engineering bridge construction.

In order to achieve the purpose, the invention adopts the technical scheme that:

a double-semi-directional ramp steel box girder for municipal engineering bridge construction comprises a steel box girder I, an auxiliary cross beam II, a steel box girder II, a supporting plate, an auxiliary supporting mechanism I, a damping mechanism, an auxiliary supporting mechanism II and a maintenance port plugging mechanism; the auxiliary cross beam I is arranged on one side of the steel box girder I; the auxiliary cross beam II is arranged on one side of the steel box girder II; the supporting plate, the auxiliary supporting mechanism I, the damping mechanism and the auxiliary supporting mechanism II are sequentially arranged in the steel box girder II; the internal structures of the steel box girder I and the steel box girder II are the same; the auxiliary cross beam I and the auxiliary cross beam II have the same structure; and the maintenance port plugging mechanism is arranged at the bottom of the steel box girder II.

The bottom of the auxiliary cross beam I is provided with a plurality of longitudinal rib plates I and transverse rib plates; i evenly distributed of longitudinal rib plate is in I bottom of auxiliary beam, is equipped with a plurality of evenly distributed's welding groove I on the horizontal gusset and is used for welding longitudinal rib plate I, is equipped with circular arc breach I on the welding groove I.

The top of the inner side of the steel box girder II is provided with a plurality of uniformly arranged U-shaped reinforcing rib plates, and the bottom of the inner side of the steel box girder II is provided with a plurality of uniformly arranged longitudinal rib plates II; an inlet is formed in the bottom of the steel box girder II, so that maintenance personnel can conveniently enter the steel box girder II for maintenance; and the steel box girder II is fixed on the pier.

A plurality of transverse reinforcing ribs and longitudinal reinforcing ribs are arranged on the two side surfaces of the supporting plate; the top of the supporting plate is provided with a plurality of uniformly arranged U-shaped welding grooves for welding U-shaped reinforcing rib plates, the bottom of the supporting plate is provided with a plurality of uniformly arranged welding grooves II for welding longitudinal rib plates II, and the welding grooves II and the welding grooves I have the same structure; an oval inlet is arranged in the middle of the supporting plate, and oval reinforcing ribs are arranged on the periphery of the oval inlet.

The auxiliary supporting mechanism I comprises a top plate I, a bottom plate I, a supporting beam, a vertical plate, a spring I, a supporting arm and a steel cable; the top plate I is arranged below the U-shaped reinforcing rib plate and supports the U-shaped reinforcing rib plate in a propping mode, and the bottom plate I is fixedly connected with the longitudinal rib plate II; one end of the vertical plate is fixedly connected with the middle section of the top plate I, the other end of the vertical plate is provided with a guide post which is inserted into the bottom plate I and movably connected with the bottom plate I through a through hole, the guide post is sleeved on the spring I, one end of the spring I is in contact with the bottom plate I, and the other end of the spring I is in contact with the end face of the vertical plate; the supporting beams are provided with a pair of supporting beams which are symmetrically distributed on two sides of the vertical plate; two ends of the supporting beam are respectively fixedly connected with the top plate I and the bottom plate I, and the supporting beam is obliquely fixed; the supporting beam is provided with a fixed shaft seat I and a fixed shaft seat II; a fixed shaft seat III and a fixed shaft seat IV are respectively arranged on two sides of the vertical plate, and the fixed shaft seat IV is arranged at the bottom end of the vertical plate and is positioned below the fixed shaft seat III; the fixed shaft seat I and the fixed shaft seat IV are parallel to each other and are arranged on one side of the vertical plate, and the fixed shaft seat III and the fixed shaft seat II are parallel to each other and are arranged on the other side of the vertical plate; two ends of the supporting arm are respectively hinged with a fixed shaft seat III and a fixed shaft seat II; and two ends of the steel cable are respectively hinged with the fixed shaft seat I and the fixed shaft seat IV.

The damping mechanism comprises a top plate II, a bottom plate II, a guide shaft, a connecting block, a supporting shaft and a spring II; the top plate II is arranged below the U-shaped reinforcing rib plate and supports the U-shaped reinforcing rib plate in a propping and supporting mode, and the bottom plate II is fixedly connected with the longitudinal rib plate II; fixing plates are arranged at two ends of the top plate II; the two ends of the guide shaft are fixedly connected with the fixed plates, and the connecting blocks are provided with a pair of guide shafts in a sleeved mode; the spring II is provided with a pair of springs which are respectively sleeved at two ends of the guide shaft, one end of the spring II is in contact with the fixed plate, and the other end of the spring II is in contact with the connecting block; a fixed seat is arranged on the bottom plate II; and the two ends of the supporting shaft are respectively hinged with the fixed seat and the connecting block.

The auxiliary supporting mechanism II comprises a top plate III, a bottom plate III, a supporting channel steel I, a supporting channel steel II, a supporting channel steel III and an adjusting arm; the top plate III is provided with a plurality of clamping blocks I, and the bottom plate III is provided with a plurality of clamping blocks II; two ends of the supporting channel steel I and two ends of the supporting channel steel II are fixedly connected with a top plate III and a bottom plate III; the supporting channel steel II is provided with a pair of supporting channel steel II which are symmetrically and obliquely fixed on two sides of the supporting channel steel I, and two ends of the supporting channel steel III are fixedly connected with a top plate III and the supporting channel steel II; two ends of the adjusting arm are connected with a supporting channel steel I and a supporting channel steel II; the adjusting arm comprises a connecting seat I, a connecting arm I, a bidirectional screw rod, a connecting arm II and a connecting seat II; the connecting base I is fixed on the supporting channel steel II through a bolt, and one end of the connecting arm I is movably connected with the connecting base I through a rotating shaft; the connecting seat II is fixed on the supporting channel steel II through a bolt; one end of the connecting arm II is movably connected with the connecting seat II through a rotating shaft; two ends of the bidirectional screw rod are provided with reverse threads, and the two ends of the bidirectional screw rod are movably connected with the other ends of the connecting arm I and the connecting arm II through the reverse threads respectively;

the maintenance port plugging mechanism comprises a track I, a track II, a sealing plate and an inlet port; the inlet is arranged at the bottom of the steel box girder II; the track II and the track I are fixed on a bottom plate of the steel box girder II, a wedge-shaped groove and a threaded hole are formed in the track I, and an oblique angle is formed in the wedge-shaped groove; the sealing plate is provided with a roller I, a handle, a positioning mechanism, a fixing plate I, a roller II and a rotating shaft; the roller I is arranged in the track II, and the roller II is arranged in the track I; the fixing plate I is attached to the inner wall of the track I; a fixed disc is arranged on the side edge of the sealing plate and is matched with a rotating shaft to be movably connected with a bottom plate of the steel box girder II; the positioning mechanism comprises a fixing plate II, a guide shaft, a wedge block, a limiting plate, a fixing frame and a spring III; the fixing plate II is fixed on the sealing plate and attached to the track I, and the fixing frame is fixed on the fixing plate II; the guide shaft is inserted into the fixing frame and the fixing plate II, the wedge block is fixed at one end of the guide shaft, an oblique angle is arranged on the wedge block, the spring III and the limiting plate are arranged in the fixing frame, the limiting plate is fixedly connected with the guide shaft, the spring III is sleeved with the guide shaft, one end of the spring III is in top contact with the fixing frame, and the other end of the spring III is in top contact with the limiting plate; the wedge block is arranged in the wedge-shaped groove, and an oblique angle on the wedge block is attached to and complementary with an oblique angle of the wedge-shaped groove;

preferably, the tops of the top plate I and the top plate II are provided with a fixture block I; clamping blocks II are arranged at the bottoms of the base plate I and the base plate II;

preferably, the bottom surface of the top plate II is provided with a guide groove, and the top of the connecting block is provided with a guide block; the guide block is arranged in the guide groove.

Preferably, a plurality of lifting lugs are arranged at the tops of the auxiliary cross beam I, the auxiliary cross beam II, the steel box girder I and the steel box girder II.

Preferably, jacks are arranged on the side edges of the steel box girder I and the steel box girder II, and inserting plates are arranged in the jacks; when the steel box girder I and the steel box girder II are in butt joint welding, the inserting plate is inserted into the inserting holes in the sides of the steel box girder I and the steel box girder II and is welded with the steel box girder I and the steel box girder II, and the effect of an auxiliary stabilizing mechanism is achieved.

The installation steps of the double-semi-directional ramp steel box girder are as follows:

1) hardening a hoisting field: firstly, ramming the bottom layer of a field in layers by adopting thick pond slag, and then repeatedly rolling and stabilizing; then, pouring a concrete pavement on the top layer of the site; furthermore, the ground pavement base plate is used for increasing the strength during hoisting; and simultaneously preparing construction equipment.

2) Setting up a temporary support: firstly, carrying out field investigation, and flattening, hardening or additionally paving a steel plate on a field for erecting a support; and then the integral structure of the temporary support is assembled and manufactured on the ground, and then the temporary support is installed by adopting an integral hoisting in-place method so as to ensure the integral stability of the temporary support.

3) Installing a steel box girder: a. hoisting a first section of steel box girder I: a bottom plate at the end part of the steel box girder I is in top contact with an end baffle plate to control the installation mileage; secondly, the height of the end part of the steel box girder I is based on a support, and a jack is used for propping and welding I-shaped steel at the end part of the steel box girder I to perform left-right adjustment on the end part of the steel box girder I; the other end of the steel box girder I is adjusted in elevation by an upright jack, the left and right directions of the steel box girder I are adjusted by a 2t hand-operated block, and the hand-operated block is connected with the steel box girder I and a mounting bracket erected on one side of the steel box girder I; detecting the coordinates of the steel box girder I by using a total station in the whole process, welding a baffle at the end part of the steel box girder I after the adjustment and the detection are qualified, and fixing the steel box girder I at the other end with the bracket; and (5) hoisting the steel box girder II by the same method.

b. Hoisting the rear section steel box girder I: firstly, hoisting a rear section steel box girder I basically in place, drawing and butting two sections of the first section steel box girder I and the rear section steel box girder I by using a 2t hand hoist, and taking a butting groove as a standard; secondly, the subsequent installation step is consistent with the first section steel box girder I hoisting step, and the connection point is welded; and the hoisting method of the rear section steel box girder II is the same as that of the first section steel box girder II.

c. The hoisting of the auxiliary beam I and the auxiliary beam II is completed according to the same hoisting steps of the steel box beam I: the auxiliary beam and the steel box beam are drawn together by using a 2t hand-operated hoist to match with the lifting lug, and the auxiliary beam and the steel box beam are controlled to be connected through the control interface, and are fixed and welded in a state of not falling off the lifting hook after the interface is adjusted and detected to be qualified.

4) a, nondestructive detection of welding seams: performing 100% ultrasonic inspection and 10% X-ray inspection; b. performing appearance inspection according to the requirement of the I-level welding seam; c. and repairing the unqualified part.

5) Performing on-site paint spraying and corrosion prevention after the double-semi-directional ramp steel box girder is installed and welded; and after the corrosion prevention is finished, the bracket can be detached to form a bridge.

Compared with the prior art, the invention has the beneficial effects that:

1) an auxiliary supporting mechanism I, a damping mechanism and a supporting plate are arranged in the steel box girder II and the steel box girder I and are fixed at intervals, so that the internal structures of the steel box girder II and the steel box girder I are supported and stabilized; the auxiliary supporting mechanism I and the damping mechanism replace supporting plates in original positions, so that the overall mass of the auxiliary supporting mechanism I and the damping mechanism is relatively reduced, the auxiliary supporting mechanism I and the damping mechanism have a favorable damping effect, and the stability of the structure is favorably protected;

2) the invention is provided with an auxiliary supporting mechanism I, which comprises a top plate I, a bottom plate I, a supporting beam, a vertical plate, a spring I, a supporting arm and a steel cable; the supporting beams are symmetrically fixed on two sides of the vertical plate, and the top plate I supports against a U-shaped reinforcing rib plate; the steel cable and the supporting arm are in X-shaped cross connection with the supporting beam and the vertical plate; when the top plate I receives pressure to be pressed downwards, firstly, downward pressure is applied to the supporting beam and the vertical plate, the supporting beam and the supporting beam provide support to provide counterforce to press the vertical plate downwards to support when the vertical plate bears pressure to release the pressure downwards, the supporting beam is obliquely fixed, the supporting beam is easily bent when being pressed in the process, at the moment, the bottom end of the vertical plate is pressed downwards, the supporting beam is pulled through a steel cable to generate tensile force aiming at the supporting beam, the supporting beam and the pressure of the supporting arm on the supporting beam form mutual counterforce to counteract each other, and the probability that the supporting beam is bent is avoided or reduced;

3) the damping mechanism comprises a top plate II, a bottom plate II, a guide shaft, a connecting block, a support shaft and a spring II, wherein the connecting block and the spring II are sleeved with the guide shaft, the spring II is arranged on one side of the connecting block, and when the top plate II receives pressure vibration; the top plate II is pressed downwards to enable the support shaft to push the connecting block to slide along the left side and the right side of the guide shaft, then the spring II pushes the connecting block to reset to achieve shock absorption on the top plate II, and therefore the shock absorption effect on the top surface of the steel box girder is achieved, and the situation that the structural main body deforms due to long-term stress is avoided;

4) the top and the bottom of backup pad are equipped with U type welding groove and welding groove II respectively, and welding groove II and U type welding groove are equipped with the repair of the welding seam of being convenient for and the maintenance of structure of circular arc breach I and circular arc breach II respectively.

5) The maintenance port plugging mechanism is internally provided with a sealing plate, a track I, a track II, an inlet and a rotating shaft; the sealing plate is provided with a plurality of rollers I and rollers II; during track II, track I were located respectively to gyro wheel I, gyro wheel II, the shrouding used the axis of rotation to rotate and open the inlet port as the axle center, and gyro wheel I, gyro wheel II rotate the slip in replacing ordinary guiding mechanism respectively in track II, track I, are favorable to reducing the friction, make to rotate more smoothly.

Drawings

FIG. 1 is a schematic structural view of a double-semi-oriented ramp steel box girder for municipal engineering bridge construction;

FIG. 2 is a schematic sectional structure view of the steel box girder II in FIG. 1;

FIG. 3 is a schematic structural view of the support plate of FIG. 1;

FIG. 4 is a schematic structural diagram of the auxiliary supporting mechanism I in FIG. 2;

FIG. 5 is a schematic structural view of the shock absorbing mechanism of FIG. 2;

FIG. 6 is a schematic structural view of the top plate II and the connecting block in FIG. 5;

FIG. 7 is a schematic structural diagram of an auxiliary beam I in FIG. 1;

FIG. 8 is a schematic structural view of the transverse web of FIG. 7;

FIG. 9 is a schematic structural diagram of an auxiliary supporting mechanism II shown in FIG. 1;

FIG. 10 is a top view of the service port blocking mechanism;

FIG. 11 is a schematic structural view of the closure plate of FIG. 10;

FIG. 12 is a schematic view of the positioning mechanism of FIG. 11;

FIG. 13 is a schematic structural view of the track I of FIG. 10;

in the figure: 1. a steel box girder I; 2. an auxiliary cross beam I; 201. a longitudinal rib plate I; 202. a transverse rib plate; 203. lifting lugs; 2021. welding a groove I; 20211. an arc notch I; 3. an auxiliary cross beam II; 4. a steel box girder II; 401. u-shaped reinforcing rib plates; 402. a longitudinal rib plate II; 403. a jack; 5. a support plate; 501. transverse reinforcing ribs; 502. longitudinal reinforcing ribs; 503. a U-shaped welding groove; 5031. a circular arc notch II; 504. an elliptical access port; 5041. an elliptical reinforcing rib; 505. welding a groove II; 6. an auxiliary supporting mechanism I; 601. a top plate I; 602. a bottom plate I; 603. a support beam; 6031. fixing the shaft seat I; 6032. fixing the shaft seat II; 604. a vertical plate; 6041. fixing the shaft seat III; 6042. fixing a shaft seat IV; 6043. a guide post; 605. a spring I; 606. a support arm; 607. a steel cable; 7. a damping mechanism; 701. a top plate II; 7011. a fixing plate; 7012. a guide groove; 702. a bottom plate II; 7021. a fixed seat; 703. a guide shaft; 704. connecting blocks; 7041. a guide block; 705. a support shaft; 706. a spring II; 8. an auxiliary supporting mechanism II; 801. a top plate III; 8011. a fixture block I; 802. a base plate III; 8021. a clamping block II; 803. supporting channel steel I; 804. supporting a channel steel II; 805. supporting channel steel III; 806. an adjusting arm; 8061. a connecting seat I; 8062. a connecting arm I; 8063. a bidirectional lead screw; 8064. a connecting arm II; 8065. a connecting seat II; 9. a maintenance port plugging mechanism; 901. a track I; 9011. a wedge-shaped groove; 902. a track II; 903. closing the plate; 9031. a roller I; 9032. a handle; 9033. a positioning mechanism; 90331. fixing a plate II; 90332. a guide shaft; 90333. a wedge block; 90334. a limiting plate; 90335. a fixing frame; 90336. a spring III; 9034. a fixing plate I; 9035. a roller II; 9036. a rotating shaft; 904. an inlet port; 10. provided is a bridge pier.

Detailed Description

For the convenience of understanding of those skilled in the art, the technical solution of the present invention will be further described in detail with reference to fig. 1 to 13.

A double-semi-directional ramp steel box girder for municipal engineering bridge construction comprises a steel box girder I1, an auxiliary cross beam I2, an auxiliary cross beam II 3, a steel box girder II 4, a supporting plate 5, an auxiliary supporting mechanism I6, a damping mechanism 7, an auxiliary supporting mechanism II 8 and a maintenance port plugging mechanism 9; the auxiliary cross beam I2 is arranged on one side of the steel box girder I1; the auxiliary cross beam II 3 is arranged on one side of the steel box girder II 4; the supporting plate 5, the auxiliary supporting mechanism I6, the damping mechanism 7 and the auxiliary supporting mechanism II 8 are sequentially arranged in the steel box girder II 4; the internal structures of the steel box girder I1 and the steel box girder II 4 are the same; the auxiliary cross beam I2 and the auxiliary cross beam II 3 have the same structure and are used for auxiliary road use and guardrail erection; and the maintenance port plugging mechanism 9 is arranged at the bottom of the steel box girder II 4.

The bottom of the auxiliary cross beam I2 is provided with a plurality of longitudinal rib plates I201 and transverse rib plates 202; the longitudinal rib plate I201 is uniformly distributed at the bottom of the auxiliary cross beam I2, the transverse rib plate 202 is provided with a plurality of uniformly distributed welding grooves I2021 and used for welding the longitudinal rib plate I201, and the welding grooves I2021 are provided with arc notches I20211 to facilitate maintenance and repair of welding seams.

The top of the inner side of the steel box girder II 4 is provided with a plurality of uniformly arranged U-shaped reinforcing rib plates 401, and the bottom of the inner side is provided with a plurality of uniformly arranged longitudinal rib plates II 402; an inlet is formed in the bottom of the steel box girder II 4, so that maintenance personnel can conveniently enter the steel box girder for maintenance; and the steel box girder II 4 is fixed on the pier 10.

A plurality of transverse reinforcing ribs 501 and longitudinal reinforcing ribs 502 are arranged on two side faces of the supporting plate 5; the top of the supporting plate 5 is provided with a plurality of uniformly arranged U-shaped welding grooves 503 for welding the U-shaped reinforcing rib plate 401, the bottom of the U-shaped welding grooves 503 is provided with arc notches II 5031 for facilitating weld repair and maintenance of the structure, the bottom of the supporting plate 5 is provided with a plurality of uniformly arranged welding grooves II 505 for welding the longitudinal rib plate II 402, and the welding grooves II 505 and the welding grooves I2021 have the same structure; an oval inlet 504 is arranged in the middle of the supporting plate 5 and used for allowing maintenance personnel to enter and exit, and oval reinforcing ribs 5041 are arranged on the periphery of the oval inlet 504 and used for reinforcing the structural stability.

The auxiliary supporting mechanism I6 comprises a top plate I601, a bottom plate I602, a supporting beam 603, a vertical plate 604, a spring I605, a supporting arm 606 and a steel cable 607; the top plate I601 is arranged below the U-shaped reinforcing rib plate 401 and supports the U-shaped reinforcing rib plate 401 in a propping mode, and the bottom plate I602 is fixedly connected with the longitudinal rib plate II 402; one end of the vertical plate 604 is fixedly connected with the middle section of the top plate I601, the other end of the vertical plate 604 is provided with a guide post 6043 which is inserted into the bottom plate I602 and movably connected with the bottom plate I602 through a through hole, the spring I605 is sleeved with the guide post 6043, one end of the spring I605 is pressed against the bottom plate I602, and the other end of the spring I is pressed against the end face of the vertical plate 604; the supporting beams 603 are provided with a pair and symmetrically distributed on two sides of the vertical plate 604; two ends of the supporting beam 603 are fixedly connected with a top plate I601 and a bottom plate I602 respectively, and the supporting beam 603 is fixed in an inclined manner; the supporting beam 603 is provided with a fixed shaft seat I6031 and a fixed shaft seat II 6032; two sides of the vertical plate 604 are respectively provided with a fixed shaft seat III 6041 and a fixed shaft seat IV 6042, and the fixed shaft seat IV 6042 is arranged at the bottom end of the vertical plate 604 and is positioned below the fixed shaft seat III 6041; the fixed shaft seat I6031 and the fixed shaft seat IV 6042 are parallel to each other and are arranged on one side of the vertical plate 604, and the fixed shaft seat III 6041 and the fixed shaft seat II 6032 are parallel to each other and are arranged on the other side of the vertical plate 604; two ends of the supporting arm 606 are hinged with a fixed shaft seat III 6041 and a fixed shaft seat II 6032 respectively; two ends of the steel cable 607 are hinged with a fixed shaft seat I6031 and a fixed shaft seat IV 6042 respectively; when the top of the steel box girder II 4 is pressed, the supporting plate 5 plays a main supporting role; meanwhile, after the top plate I601 is pressed, the vertical plate 604 and the supporting beam 603 provide support for the top plate I601, and the bottom of the vertical plate 604 provides elasticity through the spring I605 for auxiliary support; simultaneously the riser 604 pressure-bearing is to providing reaction force through support arm 606 and supporting beam 603 when releasing pressure downwards and is supporting riser 604 pushes down, can make supporting beam 603 pressurized crooked situation appear at this in-process, riser 604 pushes down not only can make it easily appear crooked through supporting beam 603 of support arm 606 effect simultaneously, and can stimulate supporting beam 603 through steel cable 607, form mutual reaction force with support arm 606 to supporting beam 603 and offset each other, avoid supporting beam 603 easily to appear crooked situation and appear.

The damping mechanism 7 comprises a top plate II 701, a bottom plate II 702, a guide shaft 703, a connecting block 704, a support shaft 705 and a spring II 706; the top plate II 701 is arranged below the U-shaped reinforcing rib plate 401 and supports the U-shaped reinforcing rib plate 401 in a propping mode, and the bottom plate II 702 is fixedly connected with the longitudinal rib plate II 402; fixing plates 7011 are arranged at two ends of the top plate II 701; the two ends of the guide shaft 703 are fixedly connected with a fixing plate 7011, and the connecting block 704 is provided with a pair of connecting blocks which are sleeved with the guide shaft 703; the spring II 706 is provided with a pair of springs which are respectively sleeved at two ends of the guide shaft 703, one end of the spring II 706 is in contact with the fixed plate 7011, and the other end of the spring II 706 is in contact with the connecting block 704; a fixed seat 7021 is arranged on the bottom plate II 702; the two ends of the supporting shaft 705 are respectively hinged with a fixed seat 7021 and a connecting block 704; when the top plate II 701 is pressed and vibrated, the top plate II 701 is pressed downwards, so that the supporting shaft 705 is stressed to push the connecting block 704 to slide along the guide shaft 703, the spring II 706 pushes the connecting block 704 to reset, and the supporting shaft 705 pushes the top plate II 701 to reset to realize the damping effect.

The auxiliary supporting mechanism II 8 comprises a top plate III 801, a bottom plate III 802, a supporting channel steel I803, a supporting channel steel II 804, a supporting channel steel III 805 and an adjusting arm 806; the top plate III 801 is provided with a plurality of clamping blocks I8011, and the bottom plate III 802 is provided with a plurality of clamping blocks II 8021; two ends of the supporting channel steel I803 and two ends of the supporting channel steel II 804 are fixedly connected with a top plate III 801 and a bottom plate III 802; the supporting channel II 804 is provided with a pair of supporting channel II channels which are symmetrically and obliquely fixed on two sides of the supporting channel I803, and two ends of the supporting channel III 805 are fixedly connected with a top plate III 801 and the supporting channel II 804; two ends of the adjusting arm 806 are connected with a supporting channel steel I803 and a supporting channel steel II 804; the top plate III 801 is clamped with the U-shaped reinforcing rib plate 401 through a fixture block I8011; the bottom plate III 802 is clamped with the longitudinal rib plate II 402 through a clamping block II 8021 and then is welded and fixed with the longitudinal rib plate II 402; the adjusting arm 806 comprises a connecting seat I8061, a connecting arm I8062, a bidirectional screw 8063, a connecting arm II 8064 and a connecting seat II 8065; the connecting seat I8061 is fixed on the supporting channel steel II 804 through a bolt, and one end of the connecting arm I8062 is movably connected with the connecting seat I8061 through a rotating shaft; the connecting seat II 8065 is fixed on the supporting channel steel II 804 through bolts; one end of the connecting arm II 8064 is movably connected with the connecting seat II 8065 through a rotating shaft; two ends of the bidirectional screw 8063 are provided with reverse threads, and the two ends are respectively movably connected with the other ends of the connecting arm I8062 and the connecting arm II 8064 through the reverse threads; when supporting II 804 of channel-section steel and appearing slightly crooked by pressure, through moving II 8065 of connecting seat to the bending point, then rotate two-way lead screw 8063 and adjust the whole length of regulating arm 806 and cooperate I8061 of connecting seat to realize the fixed point of bending point and support, avoid adding in addition the condition that the welding supported channel-section steel realized supporting, cause weight to increase.

The maintenance port plugging mechanism 9 comprises a track I901, a track II 902, a sealing plate 903 and an inlet port 904; the inlet 904 is arranged at the bottom of the steel box girder II 4; the track II 902 and the track I901 are fixed on a bottom plate of the steel box girder II 4, a wedge-shaped groove 9011 and a threaded hole are formed in the track I901, and an oblique angle is formed in the wedge-shaped groove 9011; the sealing plate 903 is provided with a roller I9031, a handle 9032, a positioning mechanism 9033, a fixing plate I9034, a roller II 9035 and a rotating shaft 9036; the roller I9031 is arranged in the track II 902, and the roller II 9035 is arranged in the track I901; the fixing plate I9034 is attached to the inner wall of the track I901; a fixed disc is arranged on the side edge of the sealing plate 903 and is matched with a rotating shaft 9036 to be movably connected with a bottom plate of the steel box girder II 4; the positioning mechanism 9033 comprises a fixing plate II 90331, a guide shaft 90332, a wedge-shaped block 90333, a limiting plate 90334, a fixing frame 90335 and a spring III 90336; the fixing plate II 90331 is fixed on the sealing plate 903 and attached to the rail I901, and the fixing frame 90335 is fixed on the fixing plate II 90331; the guide shaft 90332 is inserted into the fixing frame 90335 and the fixing plate II 90331, the wedge-shaped block 90333 is fixed to one end of the guide shaft 90332, an oblique angle is formed in the wedge-shaped block 90333, the spring III 90336 and the limiting plate 90334 are arranged in the fixing frame 90335, the limiting plate 90334 is fixedly connected with the guide shaft 90332, the spring III 90336 is sleeved with the guide shaft 90332, one end of the spring III 90336 abuts against the fixing frame 90335, and the other end of the spring III 90336 abuts against the limiting plate 90334; the wedge-shaped block 90333 is arranged in the wedge-shaped groove 9011, and the oblique angle of the wedge-shaped block 90333 is fit and complementary with the oblique angle of the wedge-shaped groove 9011; when maintenance personnel enter the steel box girder II 4 through the inlet; the sealing plate 903 is pushed to rotate along the rotating shaft 9036 through the handle 9032, the roller I9031 and the roller II 9035 rotate in the rail II 902 and the rail I901 respectively, friction is reduced by replacing a sliding mode through rolling, the wedge-shaped block 90333 slides out of the wedge-shaped groove 9011 through an oblique angle part and slides along the inner wall of the rail I901, when a maintenance worker closes the sealing plate 903, the sealing plate 903 only needs to be rotated, at the moment, the positioning mechanism 9033 passes through the wedge-shaped groove 9011, the guide shaft 90332 pushes the wedge-shaped block 90333 to be rapidly inserted into the wedge-shaped groove 9011 under the elastic force of the spring III 90336, the opposite side of the oblique angle of the wedge-shaped groove 9011 is a right angle, the opposite side of the oblique angle of the wedge-shaped block 90333 is a right angle, and the wedge-shaped block 90333 cannot slide out and is fixed by the wedge-shaped groove 9011; at this time, the fixing plate I9034 is aligned with a threaded hole in the rail I901, the sealing plate 903 is fixedly locked through the bolt matched with the fixing plate I9034, and finally the inlet 904 is sealed.

A clamping block I8011 is arranged at the tops of the top plate I601 and the top plate II 701 and used for clamping the U-shaped reinforcing rib plate 401; and the bottoms of the base plate I602 and the base plate II 702 are provided with a clamping block II 8021 for smoothly clamping the longitudinal rib plate II 402.

The bottom surface of the top plate II 701 is provided with a guide groove 7012, and the top of the connecting block 704 is provided with a guide block 7041; the guide block 7041 is arranged in the guide groove 7012 to assist in guiding and stabilizing the connecting block 704, so that the connecting block 704 is prevented from rotating along the guide shaft 703 due to stress.

A plurality of lifting lugs 203 are arranged at the tops of the auxiliary cross beam I2, the auxiliary cross beam II 3, the steel box girder I1 and the steel box girder II 4 for hoisting and welding.

Jacks are arranged at the side edges of the steel box girder I1 and the steel box girder II 4, and inserting plates are arranged in the jacks 403; when the steel box girder I1 and the steel box girder II 4 are in butt joint welding, the inserting plate is inserted into the inserting holes 403 on the side edges of the steel box girder I1 and the steel box girder II 4 and is welded with the steel box girder I1 and the steel box girder II 4, and the effect of an auxiliary stabilizing mechanism is achieved.

The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.

Claims

1. A double-semi-directional ramp steel box girder for municipal engineering bridge construction comprises a steel box girder I, an auxiliary cross beam II, a steel box girder II, a supporting plate, an auxiliary supporting mechanism I, a damping mechanism, an auxiliary supporting mechanism II and a maintenance port plugging mechanism; the auxiliary beam I is arranged on one side of the steel box girder I; the auxiliary cross beam II is arranged on one side of the steel box girder II; the supporting plate, the auxiliary supporting mechanism I, the damping mechanism and the auxiliary supporting mechanism II are sequentially arranged in the steel box girder II; the internal structures of the steel box girder I and the steel box girder II are the same; the auxiliary cross beam I and the auxiliary cross beam II have the same structure; the maintenance port plugging mechanism is arranged at the bottom of the steel box girder II; the bottom of the auxiliary cross beam I is provided with a plurality of longitudinal rib plates I and transverse rib plates; the longitudinal rib plates I are uniformly distributed at the bottom of the auxiliary cross beam I, a plurality of uniformly distributed welding grooves I are formed in the transverse rib plates and used for welding the longitudinal rib plates I, and arc notches I are formed in the welding grooves I; the top of the inner side of the steel box girder II is provided with a plurality of uniformly arranged U-shaped reinforcing rib plates, and the bottom of the inner side of the steel box girder II is provided with a plurality of uniformly arranged longitudinal rib plates II; an inlet is formed in the bottom of the steel box girder II, so that maintenance personnel can conveniently enter the steel box girder II for maintenance; and the steel box girder II is fixed on the pier.

2. The double-semi-directional ramp steel box girder for the municipal engineering bridge construction according to claim 1, wherein the auxiliary supporting mechanism I comprises a top plate I, a bottom plate I, a supporting beam, a vertical plate, a spring I, a supporting arm and a steel cable; the top plate I is arranged below the U-shaped reinforcing rib plate and supports the U-shaped reinforcing rib plate in a propping mode, and the bottom plate I is fixedly connected with the longitudinal rib plate II; one end of the vertical plate is fixedly connected with the middle section of the top plate I, the other end of the vertical plate is provided with a guide post which is inserted into the bottom plate I and movably connected with the bottom plate I through a through hole, the guide post is sleeved on the spring I, one end of the spring I is in contact with the bottom plate I, and the other end of the spring I is in contact with the end face of the vertical plate; the supporting beams are provided with a pair of supporting beams which are symmetrically distributed on two sides of the vertical plate; two ends of the supporting beam are respectively fixedly connected with the top plate I and the bottom plate I, and the supporting beam is obliquely fixed; the supporting beam is provided with a fixed shaft seat I and a fixed shaft seat II; a fixed shaft seat III and a fixed shaft seat IV are respectively arranged on two sides of the vertical plate, and the fixed shaft seat IV is arranged at the bottom end of the vertical plate and is positioned below the fixed shaft seat III; the fixed shaft seat I and the fixed shaft seat IV are parallel to each other and are arranged on one side of the vertical plate, and the fixed shaft seat III and the fixed shaft seat II are parallel to each other and are arranged on the other side of the vertical plate; two ends of the supporting arm are respectively hinged with a fixed shaft seat III and a fixed shaft seat II; and two ends of the steel cable are respectively hinged with the fixed shaft seat I and the fixed shaft seat IV.

3. The double-semi-directional ramp steel box girder for the municipal engineering bridge construction according to claim 1, wherein the damping mechanism comprises a top plate II, a bottom plate II, a guide shaft, a connecting block, a support shaft and a spring II; the top plate II is arranged below the U-shaped reinforcing rib plate and supports the U-shaped reinforcing rib plate in a propping and supporting mode, and the bottom plate II is fixedly connected with the longitudinal rib plate II; fixing plates are arranged at two ends of the top plate II; the two ends of the guide shaft are fixedly connected with the fixed plates, and the connecting blocks are provided with a pair of guide shafts in a sleeved mode; the spring II is provided with a pair of springs which are respectively sleeved at two ends of the guide shaft, one end of the spring II is in contact with the fixed plate, and the other end of the spring II is in contact with the connecting block; a fixed seat is arranged on the bottom plate II; and the two ends of the supporting shaft are respectively hinged with the fixed seat and the connecting block.

4. The double semi-directional ramp steel box girder for the municipal engineering bridge construction according to claim 1, wherein the auxiliary support mechanism II comprises a top plate III, a bottom plate III, a support channel I, a support channel II, a support channel III and an adjusting arm; the top plate III is provided with a plurality of clamping blocks I, and the bottom plate III is provided with a plurality of clamping blocks II; two ends of the supporting channel steel I and two ends of the supporting channel steel II are fixedly connected with a top plate III and a bottom plate III; the supporting channel steel II is provided with a pair of supporting channel steel II which are symmetrically and obliquely fixed on two sides of the supporting channel steel I, and two ends of the supporting channel steel III are fixedly connected with a top plate III and the supporting channel steel II; two ends of the adjusting arm are connected with a supporting channel steel I and a supporting channel steel II; the adjusting arm comprises a connecting seat I, a connecting arm I, a bidirectional screw rod, a connecting arm II and a connecting seat II; the connecting base I is fixed on the supporting channel steel II through a bolt, and one end of the connecting arm I is movably connected with the connecting base I through a rotating shaft; the connecting seat II is fixed on the supporting channel steel II through a bolt; one end of the connecting arm II is movably connected with the connecting seat II through a rotating shaft; two ends of the bidirectional screw rod are provided with reverse threads, and the two ends of the bidirectional screw rod are movably connected with the other ends of the connecting arm I and the connecting arm II through the reverse threads respectively.

5. The double-semi-directional ramp steel box girder for the municipal engineering bridge construction according to claim 1, wherein the maintenance port plugging mechanism comprises a track I, a track II, a sealing plate and an inlet port; the inlet is arranged at the bottom of the steel box girder II; the track II and the track I are fixed on a bottom plate of the steel box girder II, a wedge-shaped groove and a threaded hole are formed in the track I, and an oblique angle is formed in the wedge-shaped groove; the sealing plate is provided with a roller I, a handle, a positioning mechanism, a fixing plate I, a roller II and a rotating shaft; the roller I is arranged in the track II, and the roller II is arranged in the track I; the fixing plate I is attached to the inner wall of the track I; a fixed disc is arranged on the side edge of the sealing plate and is matched with a rotating shaft to be movably connected with a bottom plate of the steel box girder II; the positioning mechanism comprises a fixing plate II, a guide shaft, a wedge block, a limiting plate, a fixing frame and a spring III; the fixing plate II is fixed on the sealing plate and attached to the track I, and the fixing frame is fixed on the fixing plate II; the guide shaft is inserted into the fixing frame and the fixing plate II, the wedge block is fixed at one end of the guide shaft, an oblique angle is arranged on the wedge block, the spring III and the limiting plate are arranged in the fixing frame, the limiting plate is fixedly connected with the guide shaft, the spring III is sleeved with the guide shaft, one end of the spring III is in top contact with the fixing frame, and the other end of the spring III is in top contact with the limiting plate; the wedge block is arranged in the wedge-shaped groove, and the oblique angle on the wedge block is attached to and complemented with the oblique angle of the wedge-shaped groove.

6. The double-half directional ramp steel box girder for the municipal engineering bridge construction according to claim 1, wherein a plurality of transverse reinforcing ribs and longitudinal reinforcing ribs are arranged on two side faces of the supporting plate; the top of the supporting plate is provided with a plurality of uniformly arranged U-shaped welding grooves for welding U-shaped reinforcing rib plates, the bottom of the supporting plate is provided with a plurality of uniformly arranged welding grooves II for welding longitudinal rib plates II, and the welding grooves II and the welding grooves I have the same structure; an oval inlet is arranged in the middle of the supporting plate, and oval reinforcing ribs are arranged on the periphery of the oval inlet.

7. The double-semi-directional ramp steel box girder for the municipal engineering bridge construction according to claim 2, characterized in that the tops of the top plate I and the top plate II are provided with a fixture block I; clamping blocks II are arranged at the bottoms of the base plate I and the base plate II; the bottom surface of the top plate II is provided with a guide groove, and the top of the connecting block is provided with a guide block; the guide block is arranged in the guide groove.

8. The double-semi-directional ramp steel box girder for the municipal engineering bridge construction according to claim 1, wherein a plurality of lifting lugs are arranged at the tops of the auxiliary cross beam I, the auxiliary cross beam II, the steel box girder I and the steel box girder II.

9. The double-semi-oriented ramp steel box girder for the municipal engineering bridge construction according to claim 1, wherein the steel box girder I and the steel box girder II are provided with jacks at the side edges, and inserting plates are arranged in the jacks; when the steel box girder I and the steel box girder II are in butt joint welding, the inserting plate is inserted into the inserting holes in the sides of the steel box girder I and the steel box girder II and is welded with the steel box girder I and the steel box girder II, and the effect of an auxiliary stabilizing mechanism is achieved.

10. The steel box girder construction process according to claim 1, characterized by comprising the steps of:

1) hardening a hoisting field: firstly, ramming the bottom layer of a field in layers by adopting thick pond slag, and then repeatedly rolling and stabilizing; then, pouring a concrete pavement on the top layer of the site; furthermore, the ground pavement base plate is used for increasing the strength during hoisting; simultaneously preparing construction equipment;

2) setting up a temporary support: firstly, carrying out field investigation, and flattening, hardening or additionally paving a steel plate on a field for erecting a support; then the integral structure of the temporary support is assembled and manufactured on the ground, and then the temporary support is installed by adopting an integral hoisting in-place method so as to ensure the integral stability of the temporary support;

3) installing a steel box girder: a. hoisting a first section of steel box girder I: a bottom plate at the end part of the steel box girder I is in top contact with an end baffle plate to control the installation mileage; secondly, the height of the end part of the steel box girder I is based on a support, and a jack is used for propping and welding I-shaped steel at the end part of the steel box girder I to perform left-right adjustment on the end part of the steel box girder I; the other end of the steel box girder I is adjusted in elevation by an upright jack, the left and right directions of the steel box girder I are adjusted by a 2t hand-operated block, and the hand-operated block is connected with the steel box girder I and a mounting bracket erected on one side of the steel box girder I; detecting the coordinates of the steel box girder I by using a total station in the whole process, welding a baffle at the end part of the steel box girder I after the adjustment and the detection are qualified, and fixing the steel box girder I at the other end with the bracket; hoisting a steel box girder II by the same method;

b. hoisting the rear section steel box girder I: firstly, hoisting a rear section steel box girder I basically in place, drawing and butting two sections of the first section steel box girder I and the rear section steel box girder I by using a 2t hand hoist, and taking a butting groove as a standard; secondly, the subsequent installation step is consistent with the first section steel box girder I hoisting step, and the connection point is welded; the hoisting method of the rear section steel box girder II and the first section steel box girder II is the same;

c. the hoisting of the auxiliary beam I and the auxiliary beam II is completed according to the same hoisting steps of the steel box beam I: firstly, drawing the auxiliary beam and the steel box beam together by using a 2t hand-operated hoist matched with a lifting lug, controlling an interface to adjust the auxiliary beam and the steel box beam, and fixing and welding the auxiliary beam and the steel box beam in a state of not dropping a lifting hook after the interface is adjusted and detected to be qualified;

4) a, nondestructive detection of welding seams: performing 100% ultrasonic inspection and 10% X-ray inspection; b. performing appearance inspection according to the requirement of the I-level welding seam; c. repairing the unqualified part;