CN115288047A - Method and device for quickly getting through small and medium-sized bridge span after completely damaged girder - Google Patents

Abstract

The invention discloses a method and a device for quickly rush-connecting a medium-small span bridge after a girder is completely damaged, and relates to the technical field of bridge engineering rush-repair. The truss bridge is formed by splicing a plurality of sectional type splicing steel truss bridges, each sectional type splicing steel truss bridge comprises an upper structure, a middle structure and a lower structure, the upper structure is a planar net-shaped truss consisting of a telescopic connecting steel truss and an upper chord reinforcing rod, the middle structure is a supporting structure consisting of two transversely connected telescopic supporting steel trusses, and the lower structure is a planar net-shaped truss consisting of a telescopic connecting steel truss and a lower chord reinforcing rod; the structure is connected into a main beam structure by longitudinally connecting reinforcing rods, and two transverse main beam structures are connected into a whole bridge structure by reinforcing cross beams. According to the invention, the bridge is rapidly salvageed by quickly erecting the sectional type spliced steel truss bridge through the expansion device, so that the transportation is convenient, the splicing efficiency of the components is improved, the construction time is shortened, and the purpose of rapidly salvageing the bridge is achieved.

Description

Method and device for quickly getting through small and medium-sized bridge span after completely damaged girder

Technical Field

The invention relates to the technical field of rush repair of bridge engineering, in particular to a method and a device for quickly rush-connecting a middle-small span bridge after a girder is completely damaged.

Background

The bridge rapid first-aid repair not only plays an important role in promoting the development of social economy, but also is the guarantee of national safety. China is an area where natural disasters frequently occur and are easy to occur, and when a bridge is subjected to natural disasters such as debris flow and falling rocks to cause the complete damage of a main beam, a method which has strong adaptability, high flexibility, convenient transportation, rapidness and smooth operation is needed to make up for the gap in the rush repair of the bridge. The convenience of transportation is the key for restricting the first-aid repair of the bridge. After many bridges are damaged, large-scale erection equipment cannot be transported to the site for construction due to the limitation of the terrain.

Based on the requirement of rapid site construction, the steel truss bridge has the advantages of simple structure, good stability, simple assembly process and relatively convenient calculation. According to the traditional process, the Bailey bridge is a representative steel truss bridge emergency repair mode, but if the Bailey bridge is limited by the terrain, large-scale material transportation cannot be carried out, and large-scale hoisting equipment cannot be arranged on the site.

In order to solve the problems of long repair cycle and influence on normal traffic after the existing lacking bridge is completely damaged, it is particularly necessary to develop a method and a device for quickly rush-connecting medium and small span bridges after a girder is completely damaged.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a method and a device for quickly rush-repairing a medium-small span bridge after a girder is completely damaged, the method for quickly erecting a segmental spliced steel truss bridge through a telescopic device is used for quickly rush-repairing the bridge, the device is convenient to transport, the splicing efficiency of components is effectively improved, the construction time is shortened, the purpose of quickly rush-repairing the bridge is achieved, and the device is easy to popularize and use.

In order to realize the purpose, the invention is realized by the following technical scheme: a device for quickly passing a bridge across a middle or small span after a girder is completely damaged is formed by splicing a plurality of sectional type spliced steel truss bridges, wherein each sectional type spliced steel truss bridge consists of an upper structure, a middle structure and a lower structure, the upper structure is a planar net-shaped truss consisting of a telescopic connecting steel truss and an upper chord reinforcing rod, the middle structure is a supporting structure consisting of two telescopic supporting steel trusses which are transversely connected through the transverse connecting reinforcing rod, and the lower structure is a planar net-shaped truss consisting of the telescopic connecting steel truss and a lower chord reinforcing rod; the upper, middle and lower structures are connected with reserved holes on the telescopic connecting steel truss, the telescopic supporting steel truss, the upper chord reinforcing rod and the lower chord reinforcing rod through high-strength bolts to form a sectional splicing steel truss bridge, and finally, the structures are connected into a girder structure through longitudinal connecting reinforcing rods, and two transverse girder structures are connected into a whole bridge structure through reinforcing cross beams.

Preferably, the size of the telescopic support steel truss is one time of that of the telescopic connecting steel truss, and the telescopic connecting steel truss and the telescopic support steel truss are assembled by embedded hinged web members, splicing hinged reinforcing node plates, reinforcing hinged node plates and vertical fixing web members; the gusset plates at the upper edges and the lower edges of the two steel truss devices are reinforced hinged gusset plates, the gusset plate at the center line position is a spliced hinged reinforced gusset plate, the center of the spliced hinged reinforced gusset plate is connected with a vertical fixed web member, and an embedded hinged web member is connected between the spliced hinged reinforced gusset plate and the reinforced hinged gusset plate to form a prefabricated assembly.

Preferably, in order to meet the implementation performance and the structural stability of the telescopic connecting steel truss and the telescopic supporting steel truss, the node is reinforced after being stretched from a hinged state in transportation to be rigid connection, so that the structural stability is improved; the rod pieces hinged at the joints of the two steel trusses move tangentially, and the two are connected by high-strength bolts through the preformed holes which are formed in the gusset plates and the rod pieces in advance, so that the whole movable member becomes a stable structure.

Preferably, after the telescopic connecting steel truss and the telescopic supporting steel truss are transversely stretched, the heights of the embedded hinged web members and the vertical fixed web members in each telescopic steel truss are on the same horizontal plane, namely the heights of the stretched embedded hinged web members are the same as those of the vertical fixed web members, the embedded hinged web members are 45 degrees with the vertical fixed web members, the upper chord reinforcing members and the lower chord reinforcing members respectively, and the prefabricated length of the vertical fixed web members is that of the embedded hinged web members

And the requirement that the height is positioned on the same plane after stretching is met.

Preferably, the spliced hinged reinforcing gusset plate is of two hinged structures, the four directions which form an angle of 45 degrees with the horizontal direction are provided with reserved holes which are respectively connected with the embedded hinged web members in all directions, and the side surface of the gusset plate is provided with a reserved device for installing the transverse connecting reinforcing rod and is accompanied with two reserved holes so as to be connected.

Preferably, the spliced hinged reinforced gusset plate is connected with four embedded hinged web members in all directions, each hinged structure is connected with two embedded hinged web members, and the hinged part is made into an embedded structure, so that the two members are positioned on the same horizontal plane.

Preferably, the reinforced hinged gusset plate is of two hinged structures, the top of the gusset plate is provided with a reserved space and a reserved hole for installing the upper chord reinforcing rod and the lower chord reinforcing rod, and two reserved holes which form an angle of 45 degrees with the horizontal direction are arranged below the gusset plate and are connected with the embedded hinged web members.

Preferably, two ends of the vertical fixing web member are provided with reserved bolt holes which are connected with the upper chord reinforcing rod and the lower chord reinforcing rod.

Preferably, the left end and the right end of the upper chord reinforcing rod and the lower chord reinforcing rod are provided with reserved holes corresponding to the reinforced hinged joint plates and connected with the reinforced hinged joint plates; a gusset rod gusset plate is arranged at the middle position of the upper chord gusset rod and the lower chord gusset rod, corresponds to a reserved bolt hole of the vertical fixing web member in each telescopic steel truss, and is connected by using a high-strength bolt; a reserved bolt hole is formed in each reinforcing rod at 1/4, and a side device of the hinged gusset plate is reinforced in the corresponding connection telescopic connection steel truss; the upper chord strengthening rod and the lower chord strengthening rod which are positioned at the supporting points of the bridge are half of the normal size, and only one hinged rod piece is arranged.

Preferably, the both ends of transverse connection reinforcement bar have the reservation bolt hole, with articulated reinforcement gusset plate side device reservation hole of concatenation formula correspond and be connected.

Preferably, two ends of the longitudinal connecting reinforcing rod are provided with reserved bolt holes which are correspondingly connected with reserved holes of the splicing type hinged reinforcing node plate; a reserved bolt hole is arranged at the 1/4 position of the connecting device, and a side surface device of a reinforced hinged gusset plate in the telescopic connecting steel truss is correspondingly connected; and a reinforcing rod gusset plate is arranged in the middle of the longitudinal connecting reinforcing rod and correspondingly connects the vertical fixing web members of the two-linked telescopic supporting steel truss on one side of the two-section type splicing steel truss bridge.

A method for quickly opening a small and medium-sized bridge after a girder is completely damaged includes the steps of assembling whole structural components together by utilizing a telescopic supporting steel truss, and completing a sectional type splicing steel truss bridge through a telescopic device, wherein the erection construction steps are as follows:

(1) Splicing and assembling the single-section steel truss:

(1) firstly, stretching a telescopic supporting steel truss of a middle structure prefabricated component into a net structure from a compact state, placing two stretched components in parallel, and connecting the two stretched components together to form a middle structure; a reserved device for reinforcing the side surface of the gusset plate is hinged between the two pairs of telescopic supporting steel trusses in a splicing mode, a transverse connecting reinforcing rod is installed at a reserved hole by using a high-strength bolt, and the two pairs of telescopic supporting steel trusses are connected into a whole;

(2) secondly, install superstructure component on middle part structure elasticity support steel truss basis:

installing a telescopic connecting steel truss and an upper chord reinforcing rod on the upper edge of the telescopic supporting steel truss: firstly, a reinforcing rod gusset plate in the middle of an upper chord reinforcing rod corresponds to a reserved bolt hole of a vertical fixing web member of a telescopic supporting steel truss, a high-strength bolt is used for fixing, and then two ends of the upper chord reinforcing rod are connected and fixed by the high-strength bolt through the reserved bolt holes at two adjacent reinforcing hinged gusset plates at the upper end of the telescopic supporting steel truss; the other upper chord reinforcing rods are quickly installed by using the same process; then, stretching the telescopic connecting steel truss into a net structure, reinforcing a side device of the hinged gusset plate through the telescopic supporting steel truss, connecting vertical fixing web members of the telescopic connecting steel truss, and fixing at the reserved bolt holes by using high-strength bolts; then, connecting the side surface device of the reinforced hinged gusset plate in the telescopic connecting steel truss by using a high-strength bolt corresponding to a reserved bolt hole at 1/4 of the upper chord reinforcing rod;

(3) finally, installing a lower chord reinforcing rod and a telescopic connecting steel truss of the lower structural member in the same way as the upper structural member;

(4) after all the components are installed, forming a section of sectional type spliced steel truss, and splicing into a plurality of sectional type spliced steel truss bridges according to the operation method;

(2) Connecting and assembling multi-section steel trusses into a truss girder:

(1) firstly, stretching a telescopic slideway on a pier capping beam of a damaged bridge body, fixing piers at two ends by using high-strength bolts, and installing a support close to the slideway;

(2) secondly, pulleys are installed on the reinforced hinged gusset plates at the bottom of the sectional type spliced steel truss bridge, and the sectional type spliced steel truss bridge is transported to a slideway through a rigid slideway; conveying a first section of segmental spliced steel truss bridge from a pier for supporting a construction bridge body until the initial end of the side span steel truss bridge is positioned beside a pier support at the other end of the bridge body, wherein the pier support is damaged, erecting the segmental spliced steel truss bridge above the support by using a jack, then conveying the rest of the steel truss bridges to a slideway through the same operation, and positioning the tail end of the side span bridge body on the pier support of the bridge body which is well supported;

(3) and finally, connecting the sections of the segmental splicing steel truss bridges on the telescopic slideway together, and connecting the sections of segmental splicing steel truss bridges into a whole by using longitudinal connecting reinforcing rods: the node plates of the reinforcing rods in the middle of the longitudinal connecting reinforcing rods correspond to reserved bolt holes of vertical fixing web members in the two-linked telescopic supporting steel truss on the same side, and high-strength bolts are used for connection; the two ends of the longitudinal connecting reinforcing rod are fixedly connected by high-strength bolts through reserved bolt holes at two adjacent reinforcing hinged joint plates at the upper end of the telescopic supporting steel truss; the fixed pulleys form a main beam structure capable of spanning the whole warp at the bridge supporting points;

(3) And (3) completing the erection of the whole steel truss girder:

after one main beam structure is completed, the construction of the other main beam structure is completed by the same technical means, and the other main beam structure is transported to the telescopic slideway by the same process; installing a reinforcing cross beam between the two span main beam structures by using a high-strength bolt, and strengthening the transverse connection between the two span main beam structures to form a whole steel truss bridge main body;

(4) And paving a bridge deck on the steel truss bridge to complete the rapid rush-to-pass erection of the whole steel truss bridge.

The invention has the beneficial effects that: the method for quickly erecting the sectional type spliced steel truss bridge through the telescopic device is used for quickly repairing the bridge, the device is convenient to transport, has small requirements on a field operation surface, effectively improves the splicing efficiency of the components, is quick to splice and assemble on the field, shortens the construction time, achieves the aim of quickly repairing the bridge, and is convenient to prefabricate each component, high in economic benefit and wide in application prospect.

Drawings

The invention is described in detail below with reference to the drawings and the detailed description;

FIG. 1 is a schematic structural view of a single-section telescopic supporting steel truss of the present invention, which is stretched from a contracted state into a net shape;

FIG. 2 is a schematic view of the assembly of the present invention with the telescoping steel truss being stretched from a collapsed state to a net shape;

FIG. 3 is a schematic view of the net structure of the steel truss with the telescopic connection of the assembly of the present invention;

FIG. 4 is a schematic view of the connection and installation of the two-link telescopic supporting steel truss of the present invention;

FIG. 5 is a schematic structural view of the present invention for mounting the upper structural upper chord stiffening rods and the telescopically connected steel truss;

FIG. 6 is a front view of the superstructure installation of the present invention;

FIG. 7 is a top view of the superstructure installation of the present invention;

FIG. 8 is a schematic structural view of the lower chord reinforcement bar and the telescopically connected steel truss of the installation substructure of the present invention;

FIG. 9 is a front view of the substructure installation of the present invention;

FIG. 10 is a schematic view of the construction of the telescopic chute of the present invention;

FIG. 11 is a schematic view of the butt joint of each section of steel truss to the telescopic chute according to the present invention;

FIG. 12 is a schematic connection diagram of sectional type spliced steel truss bridges of the present invention;

FIG. 13 is a front view of the connection between the sectional spliced steel truss bridges of the present invention;

FIG. 14 is a schematic view of the two-span main beam structure of the present invention positioned over a telescoping ramp;

FIG. 15 is a schematic view of the overall structure of the present invention after installation of a reinforcing cross member;

FIG. 16 is a schematic structural view of the paving bridge deck of the present invention;

FIG. 17 is a schematic view of the configuration of the hinge of the embedded hinge web of the present invention;

FIG. 18 is a schematic diagram of the form change process and the bolting position of the splicing type hinged reinforced gusset plate after the stretching of the telescopic supporting steel truss;

FIG. 19 is a schematic diagram illustrating the process of the form change and the bolting position of the reinforced hinged gusset plate after the telescopic supporting steel truss is stretched;

FIG. 20 is a schematic structural view of the present invention illustrating the installation of transverse connecting reinforcement bars through the spliced hinged reinforcing gusset;

FIG. 21 is a schematic structural view of an upper chord stiffening rod according to the present invention;

FIG. 22 is a schematic view of the construction of the lower chord stiffening rod of the present invention;

FIG. 23 is a schematic structural view of an upper chord strengthening rod at a bridge fulcrum in accordance with the present invention;

FIG. 24 is a schematic structural view of a lower chord reinforcement bar at a bridge fulcrum in accordance with the present invention;

fig. 25 is a schematic connection diagram of the longitudinal connection reinforced steel truss according to the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

Referring to fig. 1 to 25, the following technical solutions are adopted in the present embodiment: the utility model provides a device is robbed through fast to bridge is striden in well small-span after girder completely destroys, the salvage bridge that the device used is well small-span bridge, according to design standard and transportation requirement, salvage the bridge and form by the concatenation of a plurality of segmental type concatenation steel truss bridges, and transversely constitute by two girder structures, segmental type concatenation steel truss bridge through telescoping device completion, every segmental type concatenation steel truss bridge length is fixed and should not be the overlength, every segmental type concatenation steel truss bridge comprises superstructure, middle part structure and substructure triplex, middle part structure is assembled through transverse connection anchor strut 9 by two allies of flexible support steel trusses 2, superstructure and substructure mainly are assembled by two allies oneself with flexible connection steel truss 1 and are accomplished.

Specifically, the upper structure is a plane net truss consisting of a telescopic connecting steel truss 1 and an upper chord reinforcing rod 3, the middle structure is a supporting structure consisting of two telescopic supporting steel trusses 2 which are transversely connected through a transverse connecting reinforcing rod 9, and the lower structure is a plane net truss consisting of the telescopic connecting steel truss 1 and a lower chord reinforcing rod 4; the upper, middle and lower structures are connected with the reserved holes on the telescopic connecting steel truss 1, the telescopic supporting steel truss 2, the upper chord reinforcing rod 3 and the lower chord reinforcing rod 4 through high-strength bolts 10 to form a sectional splicing steel truss bridge, and finally, the structures are connected into a girder structure through longitudinal connecting reinforcing rods 13, and two transverse girder structures are connected into a whole bridge structure through reinforcing cross beams 14.

It is worth noting that the size of the telescopic supporting steel truss 2 is one time of that of the telescopic connecting steel truss 1, and the telescopic connecting steel truss 1 and the telescopic supporting steel truss 2 are assembled by embedded hinged web members 5, splicing hinged reinforcing node plates 6, reinforcing hinged node plates 7 and vertical fixing web members 8; the gusset plates on the upper edges and the lower edges of the two steel truss devices are reinforced hinged gusset plates 7, the gusset plates at the center line positions are spliced hinged reinforced gusset plates 6, the center of each spliced hinged reinforced gusset plate 6 is connected with a vertical fixed web member 8, and embedded hinged web members 5 are connected between the spliced hinged reinforced gusset plates 6 and the reinforced hinged gusset plates 7 to form a prefabricated assembly.

In order to meet the requirements of the feasibility and the structural stability of the telescopic connecting steel truss 1 and the telescopic supporting steel truss 2, the nodes are reinforced from the hinged state in transportation after being stretched into rigid connection, so that the structural stability is improved; the rods hinged at the joints of the two steel trusses move tangentially, and the two rods are connected by high-strength bolts 10 through preformed holes which are arranged on the gusset plates and the rods in advance, so that the whole movable member becomes a stable structure.

When the telescopic connecting steel truss 1 and the telescopic supporting steel truss 2 are in a construction stage, the vertical distance of each rod is shortened due to transverse stretching, the embedded type hinged web members 5 and the vertical fixed web members 8 in each telescopic steel truss are on the same horizontal plane after the telescopic connecting steel truss and the telescopic supporting steel truss 2 are transversely stretched according to the vertical geometric relation of the telescopic steel truss during design, namely the embedded type hinged web members 5 and the vertical fixed web members 8 are the same in height, the embedded type hinged web members 5 are 45 degrees between the vertical fixed web members 8 and the upper chord reinforcing rods 3 and between the embedded type hinged web members 5 and the lower chord reinforcing rods 4 respectively, and the prefabricated length of the vertical fixed web members 8 is the prefabricated length of the embedded type hinged web members 5

The requirement that the height of the stretched web members is on the same plane is met, the embedded type structure of the embedded type hinged web members 5 on the same plane is guaranteed, and the shape of the hinged position is shown in figure 17.

It is worth noting that the splicing type hinged and reinforced gusset plate 6 is of two hinged structures, and is provided with reserved holes in four directions which form an angle of 45 degrees with the horizontal direction, and is respectively connected with the embedded type hinged web members 5 in all directions, and the side surface of the gusset plate is provided with a reserved device for installing the transverse connecting reinforcing rod 9 and is accompanied with two reserved holes for connection. The spliced hinged reinforced gusset plate 6 is connected with four embedded hinged web members 5 in all directions, each hinged structure is connected with two embedded hinged web members 5, and the hinged position is made into an embedded structure, so that the two members are positioned on the same horizontal plane; the form change process and the bolting position of the splicing type hinged reinforced gusset plate 6 are shown in fig. 18.

The reinforced hinged gusset plate 7 is of two hinged structures, the top of the gusset plate is provided with a reserved space and a reserved hole for installing the upper chord reinforcing rod 3 and the lower chord reinforcing rod 4, and two reserved holes which form an angle of 45 degrees with the horizontal direction are arranged below the gusset plate and are connected with the embedded hinged web members 5; the process of the change of form and the bolting position of the reinforced hinged gusset 7 are as shown in fig. 19.

And reserved bolt holes are formed in two ends of the vertical fixing web member 8 and are connected with the upper chord reinforcing rod 3 and the lower chord reinforcing rod 4. The left end and the right end of the upper chord reinforcing rod 3 and the lower chord reinforcing rod 4 are provided with reserved holes corresponding to the reinforcing hinged joint plates 7 and connected with the reinforcing hinged joint plates 7; a reinforcing rod gusset plate 11 is arranged at the middle position of the upper chord reinforcing rod 3 and the lower chord reinforcing rod 4, corresponds to a reserved bolt hole of a vertical fixing web member 8 in each telescopic steel truss, and is connected by using a high-strength bolt 10 (figures 21 and 22); a reserved bolt hole is formed in each reinforcing rod at the 1/4 position, and a side device of a reinforced hinged gusset plate 7 in the telescopic connecting steel truss 1 is correspondingly connected; the upper and lower chord strengthening rods 3, 4 at the bridge fulcrum are half the normal size, with only one hinged bar (fig. 23, 24).

In addition, the two ends of the transverse connecting reinforcing rod 9 are provided with reserved bolt holes which are correspondingly connected with reserved holes of the side device of the splicing type hinged reinforcing gusset plate 6 (figure 20).

Two ends of the longitudinal connecting reinforcing rod 13 are provided with reserved bolt holes which are correspondingly connected with the reserved holes of the splicing type hinged reinforcing node plate 6; a reserved bolt hole is arranged at 1/4 of the steel truss, and a side device of a reinforced hinged gusset plate 7 in the telescopic connecting steel truss 1 is correspondingly connected; the middle position of the longitudinal connecting reinforcing rod 13 is provided with a reinforcing rod gusset plate 11 which is correspondingly connected with a vertical fixed web member 8 (figure 25) of the two-link telescopic supporting steel truss 2 at one side of the two-section type splicing steel truss bridge.

The specific embodiment also discloses a method for quickly rush-connecting a middle-small span bridge after a girder is completely damaged, the whole structural members are assembled together by utilizing the telescopic support steel truss 2, and the sectional type splicing steel truss bridge is completed by the telescopic device, and the erection construction steps are as follows:

(1) And splicing and assembling the single-section steel truss.

Splicing and assembling the prefabricated part and the assembly:

(1) firstly, stretching a middle structure prefabricated component telescopic support steel truss 2 into a net structure (figures 1, 2 and 3) from a compact state, placing the two stretched components in parallel, and connecting the two components together to form a middle structure; a reserved device for reinforcing the side surface of the gusset plate 6 is hinged between the two pairs of telescopic supporting steel trusses 2 in a splicing mode, a transverse connecting reinforcing rod 9 is installed at a reserved hole by using a high-strength bolt 10, and the two pairs of telescopic supporting steel trusses 2 are connected into a whole (figure 4);

(2) secondly, an upper structural member is installed on the basis of the middle structure telescopic support steel truss 2.

Installing a telescopic connecting steel truss 1 and an upper chord reinforcing rod 3 on the upper edge of the telescopic supporting steel truss 2: firstly, a reinforcing rod gusset plate 11 in the middle of an upper chord reinforcing rod 3 corresponds to a reserved bolt hole of a vertical fixing web member 8 of a telescopic supporting steel truss 2, high-strength bolts 10 are used for fixing, and then two ends of the upper chord reinforcing rod 3 are connected and fixed by the high-strength bolts 10 through the reserved bolt holes at two adjacent reinforcing hinged gusset plates 7 at the upper end of the telescopic supporting steel truss 2; the other upper chord reinforcing rods 3 are quickly installed by using the same process; then, stretching the telescopic connecting steel truss 1 into a net structure, reinforcing a side device of the hinged gusset plate 7 through the telescopic supporting steel truss 2, connecting a vertical fixing web member 8 of the telescopic connecting steel truss 1, and fixing at a reserved bolt hole by using a high-strength bolt 10; then, connecting the side surface devices of the reinforced hinged gusset plates 7 in the telescopic connecting steel truss 1 by using high-strength bolts 10 (shown in figures 5, 6 and 7) corresponding to the reserved bolt holes at the 1/4 positions of the upper chord reinforcing rods;

(3) finally, the lower structural member lower chord reinforcing rods 4 and the telescopic connecting steel truss 1 are installed in the same way as the upper structural member (fig. 8 and 9).

(4) After all the components are installed, forming a section of sectional type spliced steel truss, and splicing into a plurality of sectional type spliced steel truss bridges according to the operation method;

(2) And connecting and assembling the multi-section steel trusses to form the truss girder.

(1) Firstly, stretching a telescopic slideway 12 on a pier capping beam of a damaged bridge body, fixing piers at two ends by using high-strength bolts 10, and installing a support close to the slideway (figure 10);

(2) secondly, pulleys are arranged on the reinforced hinged gusset plates 7 at the bottom of the sectional type spliced steel truss bridge, and the sectional type spliced steel truss bridge is transported to a slideway through a rigid slideway; conveying a first section of segmental spliced steel truss bridge from a pier for supporting a construction bridge body until the initial end of the side span steel truss bridge is positioned beside a pier support at the other end of the bridge body, wherein the pier support is damaged, erecting the segmental spliced steel truss bridge above the support by using a jack, then conveying the rest of the steel truss bridges to a slideway through the same operation, and positioning the tail end of the side span bridge body on the pier support of the well-supported bridge body (figure 11);

(3) finally, the sections of the segmental splicing steel truss bridges on the telescopic slideways 12 are connected together and are connected into a whole by using the longitudinal connecting reinforcing rods 13: the gusset plate 11 of the reinforcing rod in the middle of the longitudinal connecting reinforcing rod 13 corresponds to a reserved bolt hole of the vertical fixing web member 8 in the two-linked telescopic supporting steel truss 2 at the same side, and is connected by using a high-strength bolt 10; the two ends of a longitudinal connecting reinforcing rod 13 are fixedly connected by high-strength bolts 10 through reserved bolt holes at two adjacent reinforcing hinged joint plates 7 at the upper end of the telescopic supporting steel truss 2 (figures 12 and 13); the fixed pulleys form a main beam structure capable of spanning the whole warp at the bridge supporting points;

(3) And (3) completing the erection of the whole steel truss girder:

after completing one main beam structure, completing the construction of the other main beam structure by using the same technical means, and transporting the main beam structure to the telescopic slideway 12 by using the same process (figure 14); a reinforcing cross beam 14 is installed between the two span main beam structures by using a high-strength bolt 10, the transverse connection between the two main beam structures is strengthened, and a whole steel truss bridge main body is formed (figure 15);

(4) And (3) paving a bridge deck 15 on the steel truss bridge to finish the rapid rush-through erection of the whole steel truss bridge (figure 16).

The specific embodiment provides a steel truss bridge for rush repair after a bridge is completely damaged and an installation method, and the sectional type splicing steel truss bridge is completed through a telescopic device, so that the rapid emergency rush repair and recovery after the bridge is in disaster are met. The invention utilizes the telescopic steel truss to assemble and connect the whole structural member together, realizes the possibility that the main beam can be quickly opened from scratch after completely falling down, solves the problems of quick emergency opening, long repair period and influence on normal passage after the existing lacked bridge is completely damaged, and has the technical advantages that:

(1) The sectional type splicing steel truss bridge completed by the telescopic device is simple in components except for the telescopic supporting steel truss and the telescopic connecting steel truss, the transportation is very convenient, the two components are in a contraction state during transportation, the occupied area is relatively small, and the components can be smoothly transported to the site even in unfavorable terrains, so that the rush-repair time is fundamentally saved.

(2) The sectional type splicing steel truss bridge completed through the telescopic device is characterized in that a plurality of members are prefabricated members, the splicing efficiency of the members can be effectively improved, the construction time is shortened, the purpose of fast repairing the bridge is achieved, and the basic requirements of fast repairing the bridge are met.

(3) The sectional type spliced steel truss bridge completed by the expansion device can quickly form a grid structure in the process of bridging, reserved holes are provided for connecting all rod pieces, the transportation is convenient, the requirement on a field operation surface is low, and the erection can be quickly completed only when adjacent bridge decks are used as working platforms.

(4) The sectional type spliced steel truss bridge completed through the telescopic device is integrally a steel truss, each component is convenient to prefabricate, the economic benefit is high, and the sectional type spliced steel truss bridge has a wide market application prospect.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A device for quickly passing a small and medium-sized bridge after a girder is completely damaged is characterized by being formed by splicing a plurality of sectional type spliced steel truss bridges, wherein each sectional type spliced steel truss bridge consists of an upper structure, a middle structure and a lower structure, the upper structure is a planar net-shaped truss consisting of a telescopic connecting steel truss (1) and an upper chord reinforcing rod (3), the middle structure is a supporting structure consisting of two telescopic supporting steel trusses (2) which are transversely connected through a transverse connecting reinforcing rod (9), and the lower structure is a planar net-shaped truss consisting of the telescopic connecting steel truss (1) and a lower chord reinforcing rod (4); the upper, middle and lower structures are connected with reserved holes on an upper chord reinforcing rod (3) and a lower chord reinforcing rod (4) through high-strength bolts (10) on a telescopic connecting steel truss (1) and a telescopic supporting steel truss (2) to form a sectional splicing steel truss bridge, and finally, a plurality of sections of the structures are connected into a girder structure through longitudinal connecting reinforcing rods (13), and two transverse girder structures are connected into a whole bridge body structure through a reinforcing cross beam (14);

the size of the telescopic support steel truss (2) is one time of that of the telescopic connection steel truss (1), and the telescopic connection steel truss (1) and the telescopic support steel truss (2) are assembled by embedded hinged web members (5), splicing hinged reinforcing gusset plates (6), reinforcing hinged gusset plates (7) and vertical fixed web members (8); the gusset plate of reason and lower edge on two steel truss devices is for consolidating articulated gusset plate (7), and the gusset plate of central line position is the articulated gusset plate (6) of consolidating of concatenation formula, and the articulated gusset plate (6) center department of consolidating of concatenation formula is connected with vertical fixed web member (8), and the articulated gusset plate of consolidating of concatenation formula (6) and consolidate and be connected embedded articulated web member (5) between articulated gusset plate (7), form prefabricated subassembly.

2. The device for quickly grabbing the main beam to pass through the bridge after being completely damaged according to claim 1 is characterized in that the telescopic connecting steel truss (1) and the telescopic supporting steel truss (2) meet the requirements of the feasibility and the structural stability, and the nodes are reinforced after being stretched from the hinged state in transportation to be rigid connection, so that the structural stability is improved; the rod pieces hinged at the joints of the two steel trusses move tangentially, and the two are connected by high-strength bolts (10) through preformed holes which are formed in the gusset plates and the rod pieces in advance, so that the whole movable member becomes a stable structure.

3. The device for quickly grabbing the main beam to pass through the middle or small span bridge after being completely damaged according to claim 1, wherein after the telescopic connecting steel truss (1) and the telescopic supporting steel truss (2) are transversely stretched, the heights of the embedded hinged web members (5) and the vertical fixed web members (8) in each telescopic steel truss are on the same horizontal plane, namely the heights of the stretched embedded hinged web members (5) and the vertical fixed web members (8) are the same, the embedded hinged web members (5) are 45 degrees respectively arranged between the vertical fixed web members (8) and the upper chord reinforcing rods (3) and the lower chord reinforcing rods (4), and the prefabricated length of the vertical fixed web members (8) is the prefabricated length of the embedded hinged web members (5)

And the requirement that the height is positioned on the same plane after stretching is met.

4. The device for quickly passing a middle-small span bridge after a girder is completely damaged according to claim 1, wherein the spliced hinged reinforcing gusset plate (6) has two hinged structures, reserved holes are arranged in four directions which form an angle of 45 degrees with the horizontal direction and are respectively connected with embedded hinged web members (5) in all directions, and a reserved device for installing a transverse connecting reinforcing rod (9) is arranged on the side surface of the gusset plate and is accompanied with the two reserved holes so as to facilitate connection; the spliced hinged reinforcing gusset plate (6) is connected with four embedded hinged web members (5) in all directions, each hinged structure is connected with two embedded hinged web members (5), and the hinged part is made into an embedded structure, so that the two members are positioned on the same horizontal plane.

5. The device for quickly passing the middle-small span bridge after the girder is completely damaged according to claim 1, wherein the reinforced hinged gusset plate (7) has two hinged structures, a reserved space and a reserved hole for installing the upper chord reinforcing rod (3) and the lower chord reinforcing rod (4) are arranged at the top of the gusset plate, and two reserved holes which are 45 degrees to the horizontal direction are arranged below the gusset plate and are connected with the embedded hinged web members (5).

6. The device for quickly grabbing the main beam to pass through the bridge after being completely damaged according to claim 1, wherein two ends of the vertical fixing web member (8) are provided with reserved bolt holes to be connected with the upper chord reinforcing rod (3) and the lower chord reinforcing rod (4).

7. The device for quickly grabbing the main beam to pass through the bridge after being completely damaged according to claim 1 is characterized in that the left end and the right end of the upper chord reinforcing rod (3) and the lower chord reinforcing rod (4) are provided with reserved holes corresponding to the reinforcing hinged joint plates (7) and connected with the reinforcing hinged joint plates (7); a reinforcing rod gusset plate (11) is arranged at the middle position of the upper chord reinforcing rod (3) and the lower chord reinforcing rod (4), corresponds to a reserved bolt hole of a vertical fixing web member (8) in each telescopic steel truss, and is connected by using a high-strength bolt (10); a reserved bolt hole is formed in each reinforcing rod at 1/4, and a side surface device of a reinforced hinged gusset plate (7) in the telescopic connecting steel truss (1) is correspondingly connected; the upper chord strengthening rod (3) and the lower chord strengthening rod (4) at the supporting points of the bridge are half of the normal size, and only one hinged rod piece is provided.

8. The device for quickly grabbing the main beam to pass through the bridge after being completely damaged according to claim 4 is characterized in that two ends of the transverse connecting reinforcing rod (9) are provided with reserved bolt holes which are correspondingly connected with reserved holes of the side device of the splicing type hinged reinforcing gusset plate (6).

9. The device for quickly grabbing a main beam to pass through a bridge after being completely damaged according to claim 1 is characterized in that two ends of the longitudinal connecting reinforcing rod (13) are provided with reserved bolt holes which are correspondingly connected with reserved holes of the splicing type hinged reinforcing gusset plate (6); a reserved bolt hole is arranged at 1/4 of the steel truss, and a side device of a reinforced hinged gusset plate (7) in the telescopic connecting steel truss (1) is correspondingly connected; the middle position of the longitudinal connecting reinforcing rod (13) is provided with a reinforcing rod gusset plate (11), and the vertical fixed web member (8) of the two-link telescopic supporting steel truss (2) correspondingly connected with one side of the two sections of segmental splicing steel truss bridges.

10. A method for quickly getting through a bridge with a middle or small span after a girder is completely damaged is characterized in that a whole structural member is assembled together by using a telescopic supporting steel truss (2), and a sectional type splicing steel truss bridge is completed by a telescopic device, wherein the erection construction method comprises the following steps:

(1) Splicing and assembling the single-section steel truss:

(1) firstly, stretching a middle structure prefabricated component telescopic support steel truss (2) into a net structure from a compact state, placing two stretched components in parallel, and connecting the two components together to form a middle structure; a reserved device for reinforcing the side surface of the gusset plate (6) is hinged between the two pairs of telescopic supporting steel trusses (2) in a splicing mode, a transverse connecting reinforcing rod (9) is installed at a reserved hole by using a high-strength bolt (10), and the two pairs of telescopic supporting steel trusses (2) are connected into a whole;

(2) secondly, install superstructure component on middle part structure elasticity support steel truss (2) basis:

installing a telescopic connecting steel truss (1) and an upper chord reinforcing rod (3) on the upper edge of the telescopic supporting steel truss (2): firstly, a reinforcing rod gusset plate (11) in the middle of an upper chord reinforcing rod (3) corresponds to a reserved bolt hole of a vertical fixing web member (8) of a telescopic supporting steel truss (2), high-strength bolts (10) are used for fixing, and then the two ends of the upper chord reinforcing rod (3) are connected and fixed by the high-strength bolts (10) through the reserved bolt holes at two adjacent reinforcing hinged gusset plates (7) at the upper end of the telescopic supporting steel truss (2); the other upper chord reinforcing rods (3) are quickly installed by the same process; then, stretching the telescopic connecting steel truss (1) into a net structure, reinforcing a side device of the hinged gusset plate (7) through the telescopic supporting steel truss (2), connecting a vertical fixing web member (8) of the telescopic connecting steel truss (1), and fixing at a reserved bolt hole by using a high-strength bolt (10); then, the side surface device of the reinforced hinged gusset plate (7) in the telescopic connecting steel truss (1) corresponds to a reserved bolt hole at 1/4 of the upper chord reinforcing rod (3) and is connected by a high-strength bolt (10);

(3) finally, installing a lower chord reinforcing rod (4) and a telescopic connecting steel truss (1) of the lower structural member, wherein the installation method is the same as that of the upper structural member;

(4) after all the components are installed, forming a section of sectional type spliced steel truss, and splicing a plurality of sectional type spliced steel truss bridges according to the operation method;

(2) Connecting and assembling multi-section steel trusses into a truss girder:

(1) firstly, stretching a telescopic slideway (12) on a pier capping beam of a damaged bridge body, fixing piers at two ends by using high-strength bolts (10), and installing a support close to the slideway;

(2) secondly, pulleys are arranged on a reinforced hinged gusset plate (7) at the bottom of the sectional type spliced steel truss bridge, and the sectional type spliced steel truss bridge is transported to a slideway through a rigid slideway; conveying a first section of segmental spliced steel truss bridge from a pier for supporting a construction bridge body until the initial end of the side-span steel truss bridge is positioned beside a pier support at the other end of the bridge body, wherein the other end of the side-span steel truss bridge is damaged;

(3) and finally, connecting the sections of the segmental spliced steel truss bridges on the telescopic slideways (12) together, and connecting the sections of segmental spliced steel truss bridges into a whole by using longitudinal connecting reinforcing rods (13): the reinforcing rod gusset plate (11) in the middle of the longitudinal connecting reinforcing rod (13) corresponds to a reserved bolt hole of a vertical fixed web member (8) in the two-linked telescopic supporting steel truss (2) at the same side, and is connected by using a high-strength bolt (10); two ends of a longitudinal connecting reinforcing rod (13) are connected and fixed by high-strength bolts (10) through reserved bolt holes at two adjacent reinforcing hinged joint plates (7) at the upper end of the telescopic supporting steel truss (2); the fixed pulleys form a main beam structure capable of spanning the whole warp at the bridge supporting points;

(3) And (3) completing the erection of the whole steel truss girder:

after one main beam structure is completed, the construction of the other main beam structure is completed by the same technical means, and the other main beam structure is transported to the telescopic slideway (12) by the same process; a reinforcing cross beam (14) is installed between the two span main beam structures by using a high-strength bolt (10), and the transverse connection between the two main beam structures is strengthened to form a whole steel truss bridge main body;

(4) And (3) paving a bridge deck (15) on the steel truss bridge to finish the rapid rush-through erection of the whole steel truss bridge.

Images