A steel truss bridge cross-node jacking equipment and construction technology

Abstract

The present invention relates to a jacking equipment and construction technology for the cross-node of a steel truss bridge. The equipment includes a slideway arranged above the load-bearing beam, a two-way thruster arranged on the slideway and capable of moving bidirectionally along the length direction of the slideway, and a handover hydraulic cylinder that can telescopically move up and down in a direction perpendicular to the slideway. The two-way thruster jacks up the bridge, moves along the direction of the slideway to push the bridge, and after pushing the bridge to a specific position, the handover hydraulic cylinder extends upward to support the bridge, the two-way thruster separates from the bridge and moves reversely to a set point, the two-way thruster continues to perform the next jacking, the handover hydraulic cylinder retracts the cylinder, and the two-way thruster pushes the bridge until the bridge moves to a set position. The overall span of the bridge joint spacing is realized through multiple jacking and sliding by the two-way thruster. The technical solution of the present invention has the advantages of reducing working hours, high work efficiency and high economy.

Description

Technical Field

[0001] The present invention belongs to the field of steel structure bridge installation, and particularly relates to a steel truss bridge cross-node jacking equipment and construction technology. Background Art

[0002] In the field of sliding installation of steel structure truss bridges, the traditional method uses hydraulic thrusters for sliding. The hydraulic thruster skids are fixed below the nodes, and it is necessary to lay a full-length sliding beam and set up support frames throughout the range. If it is a cross-river bridge, the waterway also needs to be blocked; if a walking bridge mover is used for jacking operation, the lower chord beam between adjacent nodes bears bending moment, and the stress is very large during the sliding process and it is easy to deform and break. Generally, it is necessary to add temporary auxiliary supports between adjacent nodes of the truss bridge. After sliding in place, it needs to be removed by gas cutting in the river (or on the highway) and polished and repaired. These methods have complex construction processes, great potential safety hazards, a large amount of measures, are laborious and time-consuming, have low work efficiency, and poor economy.

[0003] Therefore, there is an urgent need for a bridge cross-node jacking equipment and construction technology with high work efficiency, high economy and simple construction process. Summary of the Invention

[0004] The object of the present invention is to overcome the above-mentioned disadvantages in the prior art, and provide a steel truss bridge cross-node jacking equipment and construction technology that can achieve the overall span of the bridge joint spacing through multiple cumulative slides on a short fixed-length slideway.

[0005] In order to achieve the above object, the present invention has the following constitution:

[0006] The present invention includes a steel truss bridge cross-node jacking equipment, which is characterized by including a slideway arranged above the load-bearing beam, a two-way thruster arranged on the slideway and capable of moving bidirectionally along the length direction of the slideway, and a replacement hydraulic cylinder that expands and contracts vertically in the direction perpendicular to the slideway;

[0007] The two-way thruster jacks up the bridge, moves along the slideway direction to push the bridge. After being pushed to a specific position, the replacement hydraulic cylinder extends upward to support the bridge, and the two-way thruster separates from the bridge and moves reversely to the reverse setting position.

[0008] In the preferred steel truss bridge cross-node jacking equipment, it further includes at least one supporting beam detachably fixed to each node of the lower chord of the bridge;

[0009] The described two-way thruster jacks up the bearing beam, causing the bearing beam and the bridge as a whole to be lifted. After the two-way thruster moves along the slideway direction to accumulate the forward stroke and push the bridge to a specific position, the replacement hydraulic cylinder extends upward to the bearing beam and supports the bearing beam and the bridge. The two-way thruster separates from the bearing beam and moves in the reverse direction to accumulate the return stroke to the reverse setting position.

[0010] In the preferred jacking equipment for the steel truss bridge cross-node, the reverse setting position is the original initial position before the two-way thruster moves along the slideway direction.

[0011] In the preferred jacking equipment for the steel truss bridge cross-node, the bearing beam includes a main beam and a stop strip fixedly connected to the main beam. The main beam and the stop strip are respectively arranged on the upper and lower end faces of the lower chord of the bridge steel truss and are fixed to the steel truss.

[0012] In the preferred jacking equipment for the steel truss bridge cross-node, the main beam and the stop strip are fixedly connected by a bolt structure. The bolt structure includes a connecting screw rod and a nut. The bolt structure is arranged on both sides of the lower chord of the bridge steel truss to fix the bearing beam to the bridge steel truss.

[0013] In the preferred jacking equipment for the steel truss bridge cross-node, main beam long grooves and stop strip long grooves extending along the length direction from the end face are respectively arranged on both sides of the main beam and the stop strip. The tail of the connecting screw rod is located in the main beam long groove. The screw rod part of the connecting screw rod respectively passes through the main beam long groove and the stop strip long groove and is arranged on both sides of the lower chord of the bridge steel truss. The main beam and the stop strip are fixed to the bridge steel truss by tightening the nut.

[0014] In the preferred jacking equipment for the steel truss bridge cross-node, at least two replacement hydraulic cylinders are included and are arranged in pairs on both sides of the slideway. When the two-way thruster moves towards the direction of the replacement hydraulic cylinder, it moves to a position flush with the replacement hydraulic cylinder.

[0015] In the preferred jacking equipment for the steel truss bridge cross-node, there is also a load-bearing support system. The load-bearing main beam is fixed on the load-bearing support system. A distribution beam is arranged on the load-bearing support system, and the replacement hydraulic cylinder is arranged on the distribution beam.

[0016] In the preferred jacking equipment for the steel truss bridge cross-node, the two-way thruster includes a thrust reaction seat for locking or releasing the slideway, a thrust hydraulic cylinder connected to the thrust reaction seat and telescopic along the slideway direction, a sliding shoe pushed by the thrust hydraulic cylinder, and a jacking hydraulic cylinder arranged on the sliding shoe. A friction-reducing plate is also arranged between the slideway and the sliding shoe.

[0017] The process of the bidirectional thruster pushing the bridge to a specific position includes the accumulation of multiple forward strokes. A single forward stroke is as follows: after the pushing reaction seat locks or clamps the slideway, the pushing hydraulic cylinder pushes the front sliding shoe and the jacking hydraulic cylinder load thereon forward for one stroke, the pushing reaction seat releases the slideway, and the pushing hydraulic cylinder returns empty;

[0018] The reverse movement of the bidirectional thruster to the reverse set position includes the accumulation of multiple return strokes. A single return stroke is as follows: the pushing reaction seat releases the slideway, the pushing hydraulic cylinder extends empty for one stroke, the pushing reaction seat clamps or locks the slideway, and the pushing hydraulic cylinder retracts to pull the sliding shoe and the jacking hydraulic cylinder thereon back for one stroke.

[0019] The present invention further includes a construction process for a steel truss bridge cross-node jacking equipment, including a slideway arranged above the bearing girder, a bidirectional thruster arranged on the slideway and capable of moving bidirectionally along the length direction of the slideway, and a replacement hydraulic cylinder that expands and contracts vertically in a direction perpendicular to the slideway;

[0020] The construction process includes the steps:

[0021] S1, the bidirectional thruster jacks up the bridge;

[0022] S2, the bidirectional thruster moves along the slideway direction to push the bridge and pushes it to a specific position;

[0023] S3, the replacement hydraulic cylinder extends upward to support the bridge;

[0024] S4, the bidirectional thruster separates from the bridge and moves reversely to the reverse set position, and continues to execute step S1 until the bridge is pushed to the set position.

[0025] In the preferred construction process of the steel truss bridge cross-node jacking equipment, it further includes at least one supporting beam detachably fixed below each node of the lower chord of the bridge;

[0026] The specific step S1 is that the bidirectional thruster jacks up the supporting beam to lift the supporting beam and the bridge as a whole;

[0027] The specific step S2 is that the bidirectional thruster moves along the slideway direction to accumulate forward strokes to push the bridge;

[0028] The specific step S3 is that the replacement hydraulic cylinder extends upward to the supporting beam and supports the supporting beam and the bridge;

[0029] Specifically, step S4 is that the bidirectional thruster separates from the supporting beam and moves reversely to accumulate the return stroke to the reverse setting position, and then step S1 is continued until the bridge is pushed to the set position.

[0030] In the preferred construction technology of the steel truss bridge cross-node jacking equipment, the bidirectional thruster includes a thrust reaction seat for locking or releasing the slideway, a thrust hydraulic cylinder connected to the thrust reaction seat and telescopic along the slideway direction, a sliding shoe pushed by the thrust hydraulic cylinder, and a jacking hydraulic cylinder arranged on the sliding shoe; a friction-reducing plate is also arranged between the slideway and the sliding shoe.

[0031] In step S2, a single forward stroke is as follows: after the thrust reaction seat locks or clamps the slideway, the thrust hydraulic cylinder pushes the front sliding shoe and the jacking hydraulic cylinder thereon to move forward one stroke, the thrust reaction seat releases the slideway, and the thrust hydraulic cylinder returns empty.

[0032] In step S4, a single return stroke is as follows: the thrust reaction seat releases the slideway, the thrust hydraulic cylinder extends empty for one stroke, the thrust reaction seat clamps or locks the slideway, and the thrust hydraulic cylinder retracts to pull the sliding shoe and the jacking hydraulic cylinder thereon back one stroke.

[0033] The steel truss bridge cross-node jacking equipment and construction technology of the present invention are adopted. The equipment includes a slideway arranged above the load-bearing beam, a bidirectional thruster arranged on the slideway and capable of moving bidirectionally along the length direction of the slideway, and a handover hydraulic cylinder that telescopically moves up and down in the direction perpendicular to the slideway; the bidirectional thruster jacks up the bridge and moves along the slideway direction to push the bridge. After being pushed to a specific position, the handover hydraulic cylinder extends upward to support the bridge, the bidirectional thruster separates from the bridge and returns reversely to the original position, and the bidirectional thruster continues to perform the next cross-node push until the bridge is pushed to the set position. Through multiple accumulative slips of the bidirectional thruster, the overall span of the bridge joint spacing is achieved. The technical solution of the present invention has the advantages of reducing working hours, high working efficiency, and high economy.

[0034] The steel truss bridge cross-node jacking equipment and construction technology of the present invention are adopted. The equipment further includes at least one supporting beam detachably fixed under the bridge; the bidirectional thruster jacks up the supporting beam to lift the supporting beam and the bridge as a whole; the bidirectional thruster moves along the slideway direction to push the bridge. After being pushed to a specific position, the handover hydraulic cylinder extends upward to the supporting beam and supports the supporting beam and the bridge. The bidirectional thruster separates from the supporting beam and returns reversely to the original position. By arranging a supporting beam at the contact position between the bridge node and the bidirectional thruster below the bridge, the lower chord of the bridge no longer bears the construction bending moment, and the jacking equipment of the present application can also be applied to various other bridges by changing the structure of the supporting beam. Brief Description of the Drawings

[0035] Figure 1 Structural schematic diagram of the initial position of the steel truss bridge cross-node jacking equipment in the preferred embodiment of the present invention;

[0036] Figure 2 Schematic diagram of the forward cumulative sliding process of the two-way pusher during the steel truss jacking construction in the preferred embodiment of the present invention;

[0037] Figure 3 Schematic diagram of the process of the two-way pusher sliding across the node to the position where the replacement cylinder jacks up in the preferred embodiment of the present invention;

[0038] Figure 4 Schematic diagram of the process of the replacement hydraulic cylinder jacking up, the jacking hydraulic cylinder retracting, load transfer, and reverse switching of the two-way pusher in the preferred embodiment of the present invention;

[0039] Figure 5 Schematic diagram of the process of the two-way pusher pulling back in place across the node and jacking up the bridge again in the preferred embodiment of the present invention;

[0040] Figure 6 Schematic diagram of the process of removing the connection of the supporting beam, retracting the replacement cylinder, and the supporting beam falling back to the slideway in the preferred embodiment of the present invention;

[0041] Figure 7 Schematic diagram of the beam lowering in place after sliding in the preferred embodiment of the present invention;

[0042] Figure 8 Cross-sectional schematic diagram of the jacking equipment in the preferred embodiment of the present invention;

[0043] Figure 9 Schematic diagram of the supporting beam structure in the preferred embodiment of the present invention;

[0044] Figure 10 Cross-sectional schematic diagram of the two-way pusher in the preferred embodiment of the present invention;

[0045] Figure 11 Step diagram of the preferred construction process of the present invention;

[0046] Symbol Description:

[0047] Steel truss bridge 1; Lower chord of the bridge 101; Supporting beam 2; Main beam 201; Connecting screw 202; Stop bar 203; Nut 204; Two-way pusher 3; Sliding shoe 301; Anti-friction plate 302; Jacking hydraulic cylinder 303; Load-bearing beam 4; Slideway 5; Replacement hydraulic cylinder 6; Distribution beam 7; Load-bearing support system 8. Detailed Description of the Invention

[0048] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only partial embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts also fall within the scope of protection of the present invention.

[0049] The present invention includes a jacking equipment for a steel truss bridge cross-joint, which is characterized by comprising a slideway 5 arranged above a load-bearing beam 4, a two-way thruster 3 arranged on the slideway 5 and capable of moving bidirectionally along the length direction of the slideway 5, and a handover hydraulic cylinder 6 that can telescopically move up and down in a direction perpendicular to the slideway 5.

[0050] The two-way thruster 3 jacks up the bridge, moves along the direction of the slideway to push the bridge, and after pushing to a specific position, the handover hydraulic cylinder 6 extends upward to support the bridge. The two-way thruster 3 separates from the bridge and moves reversely to a reverse setting position. The reverse setting position can be any set position, preferably, it can also be the original position before the two-way thruster 3 moves along the slideway direction. This reverse setting position is a position on the load-bearing beam 4 far from the moving direction of the bridge and needs to correspond to the next node of the bridge to meet the requirement for the two-way thruster 3 to perform the next jacking stroke.

[0051] The jacking equipment of the present application completes multiple cumulative slides on the slideway 5 through the two-way thruster 3 that can reciprocate along the slideway 5 and the handover hydraulic cylinder 6 used to temporarily support the bridge when the two-way thruster 3 returns, realizing the overall span of the bridge joint spacing.

[0052] In a preferred embodiment, it further includes at least one supporting beam 2 detachably fixed under the bridge. The two-way thruster 3 jacks up the supporting beam 2 to lift the supporting beam 2 and the bridge as a whole. The two-way thruster 3 moves along the direction of the slideway 5 to push the bridge, and after pushing to a specific position, the handover hydraulic cylinder 6 extends upward to the supporting beam 2 and supports the supporting beam 2 and the bridge. The two-way thruster 3 separates from the supporting beam 2 and moves reversely to the original position.

[0053] A temporary detachable joist 2 is arranged below each node of the lower chord of the truss bridge. By using a two-way thruster 3 and performing multiple cumulative slips on the slideway 5, the overall span of the bridge joint spacing can be achieved. By installing the joist 2 under the lower chord of the truss bridge node to bear the jacking or handover load during the slip process, the lower chord 101 of the bridge no longer bears the construction bending moment, and the supporting force is always borne by the original node support, eliminating the temporary reinforcement support used in the prior art. After the slip is in place, the temporary reinforcement measures and subsequent repairs for the mid-span bridge do not need to be removed, greatly saving the bridge slip operation time and effectively improving the operation efficiency. At the same time, the support system and the slideway are arranged in a segmented and spaced manner, effectively reducing the amount of measures and the impact on the normal passage of the waterway.

[0054] In a preferred embodiment, the joist 2 is composed of a main beam 201, a connecting screw 202, a stop strip 203, a nut 204, etc. It is temporarily fixed directly below the node of the lower chord 101 of the truss bridge during the slip process and bears the distributed weight of the bridge slip condition during the slip or handover process. Any detachable fixing method belongs to the protection scope of this application.

[0055] In a preferred embodiment, the joist 2 includes a main beam 201 and a stop strip 203 fixedly connected to the main beam 201; the main beam 201 and the stop strip 203 are respectively arranged on the upper and lower end faces of the lower chord of the bridge steel truss and are fixed to the steel truss.

[0056] The main beam 201 and the stop strip 203 are fixedly connected by a bolt structure; the bolt structure includes a connecting screw 202 and a nut 204. The bolt structure is arranged on both sides of the lower chord of the bridge steel truss to fix the joist to the bridge steel truss;

[0057] Long grooves extending inward along the length direction are respectively arranged on both sides of the main beam 201 and the stop strip 203. The tail of the connecting screw 202 is located in the long groove of the main beam 201. The screw part of the connecting screw 202 is arranged on both sides of the lower chord of the bridge steel truss, and the main beam 201 and the stop strip 203 are fixed to the bridge steel truss by the nut 204.

[0058] As Figure 8 and Figure 9The figure shows a schematic diagram of the preferred joist 2 structure. The top of the main beam 201 is provided with main beam 201 long grooves extending inward from both side end faces in the length direction. Preferably, a rectangular cavity along the length direction of the main beam 201 is provided on the lower surface of the top of the main beam 201. In this embodiment, the main beam 201 long groove is in the shape of a rectangular cavity with a long strip-shaped opening at the top. When assembling the connecting screw 202, the tail of the connecting screw 202 can slide therein without rotating. For example, a connecting screw 202 with a hexagonal tail is used. The cross-sectional width of this rectangular cavity is greater than the distance between the opposite faces of the hexagon and less than the diagonal distance. Therefore, when the tail of the connecting screw 202 is installed in this rectangular cavity, the tail of the connecting screw 202 can slide therein without rotating. The screw part of the connecting screw 202 extends out from the long strip-shaped opening and is located on both sides of the steel truss. The two side connecting screws 202 can adapt to different cross-sectional widths of the lower chord 101 of the bridge within a certain range by moving in the main beam 201 long groove. Correspondingly, the stop bar 203 is also provided with stop bar 203 long grooves extending along its length direction from both side end faces. After the connecting screw 202 passes through the stop bar 203 long groove, tightening the nut 204 can fix the joist 2 to the steel truss.

[0059] In a preferred embodiment, the shape of the main beam can be adaptively changed according to the actual use scenario. For example, when the bridge steel truss has a curvature, the angle of the lower end face of the main beam can be changed so that the lower end face of the main beam remains horizontal and can be jacked up by the handover hydraulic cylinder and the bidirectional thruster. Therefore, the technical solution of this application can make the jacking device adapt to any use scenario of the bridge steel truss through the setting of the joist.

[0060] In a preferred embodiment, at least two handover hydraulic cylinders 6 are provided in pairs on both sides of the slideway 5. When the bidirectional thruster 3 moves towards the handover hydraulic cylinder 6, it moves to a position flush with the handover hydraulic cylinder 6.

[0061] Preferably, the handover hydraulic cylinders 6 are located on both sides of the slideway 5 and are vertically fixed on the front support tower truss distribution beam 7 (or the surrounding support structure). When the sliding shoe 301 of the bidirectional thruster 3 slides to a position flush with the handover hydraulic cylinder 6, the joist 2 can be jacked up to support the bridge for handover. When the bidirectional thruster 3 idles back to the initial position and jacks up the joist 2 again, the handover hydraulic cylinder 6 retracts the cylinder and disengages from the joist 2. In this way, alternating work with the jacking hydraulic cylinder 303 can continuously start the next round of cycle.

[0062] In a preferred embodiment, the joist 2 is detachable. When the joist 2 needs to be removed, the bolt fixing between the stop bar 203 and the main beam 201 in the joist 2 is released, so as to release the constraint between the joist 2 and the bridge. When removing, use the handover hydraulic cylinder 6 to catch the joist 2. When the handover hydraulic cylinder 6 descends, it drives the joist 2 to descend until the joist 2 abuts against the slideway 5 and disengages from the end of its piston rod.

[0063] In a preferred embodiment, there is also a load-bearing support system 8. The load-bearing main beam 4 is fixed on the load-bearing support system 8; a distribution beam 7 is arranged on the load-bearing support system 8. Preferably, the handover hydraulic cylinder 6 is arranged on the distribution beam 7.

[0064] The load-bearing main beam, distribution beam, load-bearing support system, etc. bear the distributed weight of the bridge under various working conditions during the sliding process. Calculated according to the maximum stress working condition, the length of the load-bearing main beam 4 should meet the sum of the maximum distance between adjacent nodes of the lower chord of the truss and the length of the two-way thruster 3.

[0065] In a preferred embodiment, the two-way thruster 3 includes a thrust reaction seat, a thrust hydraulic cylinder arranged on the thrust reaction seat and telescopic along the direction of the slideway 5, a sliding shoe 301 pushed by the thrust hydraulic cylinder, and a jacking hydraulic cylinder 303 arranged on the sliding shoe 301; a friction-reducing plate 302 is also arranged between the slideway 5 and the sliding shoe 301.

[0066] The process of the two-way thruster pushing the bridge to a specific position includes the accumulation of multiple forward strokes. A single forward stroke is: when the thrust reaction seat locks or clamps the slideway, the thrust hydraulic cylinder pushes the front sliding shoe and the jacking hydraulic cylinder on it forward for one stroke, the thrust reaction seat releases the slideway, and the thrust hydraulic cylinder returns empty;

[0067] The process of the two-way thruster moving in the reverse direction to the reverse set position includes the accumulation of multiple return strokes. A single return stroke is: the thrust reaction seat releases the slideway, the thrust hydraulic cylinder extends empty for one stroke, the thrust reaction seat clamps or locks the slideway, and the thrust hydraulic cylinder retracts to pull the sliding shoe and the jacking hydraulic cylinder on it back for one stroke.

[0068] Preferably, as Figure 10As shown in the figure, the two-way pusher 3 is composed of a sliding shoe 301, a friction-reducing plate 302, a jacking hydraulic cylinder 303, a pushing hydraulic cylinder, a pushing reaction seat, etc. The jacking hydraulic cylinder 303 is placed on the upper part of the sliding shoe 301, the friction-reducing plate 302 is arranged at the bottom of the sliding shoe 301, one end of the pushing hydraulic cylinder is connected to the sliding shoe 301, and the opposite end is connected to the pushing reaction seat. The pushing reaction seat bears the reaction force of the pushing hydraulic cylinder and is locked unidirectionally or bidirectionally with the slideway 5 according to the working conditions, or releases the constraint with the slideway 5. The specific form of the two-way pusher 3 is not limited. When the two-way pusher 3 works forward, the extension of the jacking hydraulic cylinder can lift the bridge, and the pushing hydraulic cylinder can push the bridge forward by one stroke. After the stroke is completed, the pushing hydraulic cylinder returns empty, and after returning, it can push the bridge forward by one stroke again, and so on, to complete the cumulative sliding work between adjacent nodes, that is, lift once and slide cumulatively multiple times to complete the sliding of the truss bridge span nodes.

[0069] Preferably, after the cumulative sliding of a single-span node is completed, the two-way pusher can quickly switch in the reverse direction to pull the empty two-way pusher back to the initial position.

[0070] The preferred slideway 5 is composed of a steel plate chute, a mirror stainless steel plate, etc. The steel plate chute is fixedly connected to the sliding girder. The mirror stainless steel plate is laid on the upper surface of the steel plate chute. The steel plate chute plays a role in bearing weight and lateral limit guidance, provides a reaction support for the pushing reaction seat at the same time, and forms a friction-reducing sliding pair with the bottom of the sliding shoe 301.

[0071] The present invention provides a jacking equipment and construction technology for the truss bridge span nodes, which not only solves the problems of high cost of conventional sliding measures for long sliding girders and limited site; but also solves the problems of the lower chord of the walking jacking bridge bearing bending moment between adjacent nodes and the need to increase temporary support reinforcement between nodes, resulting in waste of materials, labor and time; at the same time, it overcomes the safety problems of the walking bridge equipment being frequently lifted and replaced, and the uneven force on the bridge and passive overload are likely to occur during the replacement.

[0072] By arranging a jacking support system at intervals at the bottom of the truss bridge, the jacking hydraulic cylinder jacks up once, and the pushing hydraulic cylinder accumulatively slides in the adjacent node spacing, the overall translation of the truss bridge span nodes can be realized, which greatly saves the sliding preparation and operation time, effectively improves the operation efficiency, all the sliding measures are convenient to combine, can be recycled multiple times, and are energy-saving and environment-friendly.

[0073] The technical solution of this application also includes a supporting beam. By arranging the supporting beam, the jacking equipment of this application can be applied to truss bridges of various structures, and there is no need to weld on the main body during the sliding process of the bridge, and there is no need to repair in the span after reaching the position, completely eliminating potential safety hazards and filling the domestic gap in the non-destructive and efficient sliding technology of steel truss bridges.

[0074] Preferably, the installation process of the jacking construction technology for the steel truss bridge cross-node is as follows. It includes determining the layout position of the load-bearing support system 8 according to the requirements of bridge segment assembly and simulation calculation. After the foundation meets the maximum bearing requirement, install the support system. Set the distribution beam 7 on the support system, and erect the load-bearing beam 4 on the distribution beam 7. The load-bearing beam 4 should not only meet the maximum force requirement when the two-way thruster 3 jacks the bridge, but also have a length greater than the sum of the maximum spacing of the lower chord nodes of the truss bridge and the length of the two-way thruster 3. Install the slideway 5 on the load-bearing beam 4, and set the two-way thruster 3 on the slideway 5. The initial position of the two-way thruster 3 (the position of the lifting hydraulic cylinder 303) should be directly below the lower chord node of the steel truss bridge 1, and the moving distance in its forward direction should be greater than or equal to the adjacent node spacing of the lower chord of the truss bridge. On both sides of the slideway 5 where the two-way thruster 3 is located, a pair of replacement hydraulic cylinders 6 are set. The replacement hydraulic cylinders 6 are vertically fixed on the distribution beam 7 of the front support tower (or other surrounding support structures). After the replacement hydraulic cylinders 6 retract to the bottom, the top elevation of their pistons does not exceed the top elevation of the slideway 5. Set the supporting beam 2 directly below the bottom of the lower chord of all the nodes of the steel truss bridge 1 and temporarily fix it to the lower chord 101 of the bridge.

[0075] The present invention also includes a jacking construction technology for a steel truss bridge cross-node, which includes a slideway 5 arranged above the load-bearing beam 4, a two-way thruster 3 arranged on the slideway 5 and capable of moving bidirectionally along the length direction of the slideway 5, and a replacement hydraulic cylinder 6 that expands and contracts vertically in a direction perpendicular to the slideway 5;

[0076] As Figure 11 shown, the construction technology includes the steps:

[0077] S1, the two-way thruster jacks up the bridge;

[0078] S2, the two-way thruster moves along the direction of the slideway to push the bridge and pushes it to a specific position;

[0079] S3, the replacement hydraulic cylinder extends upward and supports the bridge;

[0080] S4, the two-way thruster separates from the bridge and slides back to its original position in the reverse direction, and continues to execute step S1.

[0081] In the preferred jacking construction technology for the steel truss bridge cross-node, it also includes at least one supporting beam that is detachably fixed below the bridge;

[0082] The specific step S1 is that the two-way thruster jacks up the supporting beam, so that the supporting beam and the bridge are lifted as a whole;

[0083] The specific step S2 is that the two-way thruster moves along the direction of the slideway to accumulate the forward stroke to push the bridge;

[0084] Specifically, in step S3, the handover hydraulic cylinder extends upward to the supporting beam and supports the supporting beam and the bridge.

[0085] Specifically, in step S4, the bidirectional thruster separates from the supporting beam and moves backward cumulatively to the reverse setting position, and then continues to execute step S1 until the bridge is pushed to the set position.

[0086] The process of the bidirectional thruster pushing the bridge to a specific position includes the accumulation of multiple forward strokes. A single forward stroke is as follows: after the pushing reaction seat locks or clamps the slideway, the pushing hydraulic cylinder pushes the front slide shoe and the jacking hydraulic cylinder on it forward for one stroke, the pushing reaction seat releases the slideway, and the pushing hydraulic cylinder returns empty.

[0087] The process of the bidirectional thruster moving backward to the reverse setting position includes the accumulation of multiple return strokes. A single return stroke is as follows: the pushing reaction seat releases the slideway, the pushing hydraulic cylinder extends empty for one stroke, the pushing reaction seat clamps or locks the slideway, and the pushing hydraulic cylinder retracts to pull the slide shoe and the jacking hydraulic cylinder on it back for one stroke.

[0088] As Figures 1 to 6 , the figure shows the construction process of the jacking equipment for the joints of a 1-span steel truss bridge. As Figure 1 shown, all the jacking hydraulic cylinders 303 of the bidirectional thrusters 3 under the bridge joints are synchronously jacked up (only one set of jacking equipment is shown as an example in Figure 1 ), so that the steel truss bridge 1 is suspended, the auxiliary assembly jig is removed, the pushing reaction seat is locked with the slideway 5. As Figure 2 shown, the pushing hydraulic cylinder starts to extend, pushing the truss bridge forward for one stroke, the pushing hydraulic cylinder returns empty, the constraint of the pushing reaction seat is released. After the pushing hydraulic cylinder retracts to the end, the pushing reaction seat is locked again, and the pushing hydraulic cylinder extends again to push the steel truss bridge 1 forward for another stroke. And so on, until the bridge is slid to a position where the jacking hydraulic cylinder 303 and the handover hydraulic cylinder 6 are in a straight line. As Figure 3 shown, the single-span joint cumulative sliding ends.

[0089] As Figure 4As shown, the handover step starts. The handover hydraulic cylinder 6 extends its cylinder, abuts against the supporting beam 2 and then bears the load weight of the original jacking hydraulic cylinder 303. The jacking hydraulic cylinder 303 retracts its cylinder to complete the handover. After the jacking hydraulic cylinder 303 retracts its cylinder, the constraint of the pushing reaction seat is released. The pushing hydraulic cylinder extends its cylinder without load to move the reaction seat backward by one stroke, and then locks the reaction seat again. The pushing hydraulic cylinder retracts its cylinder to pull back the sliding shoe 301 and the hydraulic jacking cylinder thereon. After the pulling-back stroke ends, the constraint of the pushing reaction seat is released again. The pushing hydraulic cylinder extends its cylinder without load to move the reaction seat backward again. After the stroke is in place, the reaction seat is locked again. The pushing hydraulic cylinder retracts its cylinder to pull back the sliding shoe 301 and the hydraulic jacking cylinder thereon again, and so on until the two-way pusher 3 returns to the initial position as shown in Figure 5 . At this time, the jacking hydraulic cylinder 303 is aligned with the center of the next supporting beam 2.

[0090] The jacking and pushing of the second cycle starts. As shown in Figure 6 , the jacking hydraulic cylinder 303 extends its cylinder. After abutting against the next supporting beam 2, the handover hydraulic cylinder 6 retracts its cylinder, and all its bridge loads are transferred to the jacking hydraulic cylinder 303, and a new round of cross-node cumulative sliding starts, and so on until the truss bridge guide beam is erected on the two-way pusher 3 on the opposite bank.

[0091] In a preferred embodiment, the two-way pushers 3 on both banks are pushed synchronously until the steel truss bridge 1 is slid in place as shown in Figure 7 . For the supporting beam 2 that is no longer needed during the sliding process across the river channel, when the handover hydraulic cylinder 6 at the forefront of the river bank is loaded, the temporary connection between the upper supporting beam 2 and the lower chord of the truss bridge can be removed. Along with the extension of the jacking cylinder and the retraction of the handover hydraulic cylinder 6, this supporting beam 2 will descend until it touches the slideway 5 and then disconnects from the handover hydraulic cylinder 6. At this time, a simple lifting device can be used to remove the supporting beam 2 to the ground or a trolley, which is convenient for subsequent or next cycle utilization, and at the same time avoids removing the supporting beam 2 in the river channel.

[0092] When the bridge is slid in place, bearings are placed at the pier positions, and then the jacking hydraulic cylinder or the handover hydraulic cylinder retracts its cylinder at the adjacent bearing positions to complete the work of lowering the beam. If the beam lowering height is not enough, the support system needs to be adjusted, the jacking hydraulic cylinder and the handover hydraulic cylinder are rearranged, and the beam is lowered by the alternating action of the two groups of hydraulic cylinders and the removal of the cushion blocks. After the beam lowering is completed, the front and rear guide beams (if there is a rear guide beam), the two-way pusher, the handover hydraulic cylinder, the load-bearing beam, the supporting beam, the load-bearing beam, the support system, etc. are removed for subsequent cycle use.

[0093] The above descriptions are all about the construction technology of incremental launching of steel truss bridges with equal node spacings. For the incremental launching equipment and construction technology of truss bridges with unequal node spacings across nodes, they are similar to those with equal node spacings. The replacement hydraulic cylinders are still arranged on the distribution beam of the front support tower. All incremental launching is based on this as the target point; the lengths of all load-bearing girders and the support systems are the same. The difference lies in that the length of the load-bearing girder should meet the requirements of the incremental launching technology for crossing the maximum node spacing of the lower chord of the truss bridge. When sliding, the front and rear different nodes are misaligned and the replacement is carried out at different times, that is, all bidirectional thrusters reach the target position (replacement position) first and replace hands first. After replacement, they return to the next node position by themselves, and then lift the load and push together. Thus, it can be seen that as long as the principles of "whoever arrives replaces, whoever replaces returns, and single return and common push" are followed, the equipment and construction technology of the present invention are still applicable to the incremental launching of truss bridges with unequal node spacings across nodes.

[0094] For cable-stayed bridges or other steel box girder bridges with reinforced lower chords, as long as the load-bearing calculation meets the requirements of the working conditions, this incremental launching equipment and construction technology can also be used for construction.

[0095] As shown in this application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. "First" and "second" are not limiting terms. They are only for explanation to facilitate understanding of the technical solution of the invention. The contents related to "first" and "second" can be replaced with each other. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or equipment may also include other steps or elements.

[0096] Unless otherwise specifically stated, the components, relative arrangements, functions, and numerical values described in these embodiments do not limit the scope of the present invention. At the same time, obviously, for the convenience of description, the dimensions of each part shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and equipment known to those of ordinary skill in the relevant art are not described in detail for the time being, but under appropriate circumstances, the said technologies, methods, and equipment should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely illustrative and not as a limitation. Therefore, other examples of the step-by-step embodiments may have different sequences.

[0097] The foregoing is a description of the invention and should not be construed as limiting thereof. Although several exemplary embodiments of the invention have been described, those skilled in the art will readily appreciate that many modifications can be made to the exemplary embodiments without departing from the technical features of the invention. Accordingly, all such modifications are intended to be included within the scope of the invention as defined by the claims. It should be understood that the foregoing is a description of the invention and should not be considered limited to the specific embodiments disclosed, and modifications to the disclosed embodiments as well as other embodiments are intended to be included within the scope of the appended claims. The invention is defined by the claims and their equivalents.

Claims

1. A steel truss bridge span node jacking equipment, characterized in that, it includes a slideway arranged above the load-bearing beam, a two-way thruster arranged on the slideway and capable of moving bidirectionally along the length direction of the slideway, and a handover hydraulic cylinder that can telescopically move up and down in the direction perpendicular to the slideway; the two-way thruster jacks up the bridge, moves along the direction of the slideway to push the bridge, after pushing to a specific position, the handover hydraulic cylinder extends upward to support the bridge, the two-way thruster separates from the bridge and moves reversely to the reverse setting position; the two-way thruster includes a pushing reaction seat for locking or releasing the slideway, a pushing hydraulic cylinder connected to the pushing reaction seat and capable of telescoping along the slideway direction, a sliding shoe pushed by the pushing hydraulic cylinder, and a jacking hydraulic cylinder arranged on the sliding shoe; a friction-reducing plate is also arranged between the slideway and the sliding shoe; the process of the two-way thruster pushing the bridge to a specific position includes the accumulation of multiple forward strokes, and a single forward stroke is: after the pushing reaction seat locks the slideway, the pushing hydraulic cylinder pushes the front sliding shoe and the jacking hydraulic cylinder on it to load forward for one stroke, the pushing reaction seat releases the slideway, and the pushing hydraulic cylinder returns empty; the two-way thruster moving reversely to the reverse setting position includes the accumulation of multiple return strokes, and a single return stroke is: the pushing reaction seat releases the slideway, the pushing hydraulic cylinder extends empty for one stroke, the pushing reaction seat locks the slideway, the pushing hydraulic cylinder retracts, and pulls the sliding shoe and the jacking hydraulic cylinder on it back for one stroke; at least one supporting beam detachably fixed to each node of the lower chord of the bridge; the two-way thruster jacks up the supporting beam to lift the supporting beam and the bridge as a whole; after the two-way thruster moves along the direction of the slideway to accumulate forward strokes to push the bridge to a specific position, the handover hydraulic cylinder extends upward to the supporting beam and supports the supporting beam and the bridge, the two-way thruster separates from the supporting beam and moves reversely to accumulate return strokes to the reverse setting position; the supporting beam includes a main beam and a stop strip fixedly connected to the main beam; the main beam and the stop strip are respectively arranged on the upper and lower end faces of the lower chord of the bridge steel truss and are fixed to the steel truss; the main beam and the stop strip are fixedly connected by a bolt structure; the bolt structure includes a connecting screw rod and a nut, and the bolt structure is arranged on both sides of the lower chord of the bridge steel truss to fix the supporting beam to the bridge steel truss; main beam long grooves and stop strip long grooves extending along the length direction from the end face are respectively arranged on both sides of the main beam and the stop strip, the tail of the connecting screw rod is located in the main beam long groove, the screw rod part of the connecting screw rod respectively passes through the main beam long groove and the stop strip long groove, and is arranged on both sides of the lower chord of the bridge steel truss, and the main beam and the stop strip are fixed to the bridge steel truss by screwing the nut tightly.

2. The steel truss bridge span node jacking equipment according to claim 1, characterized in that, It comprises at least two hand-changing hydraulic cylinders arranged in pairs on both sides of the slideway, and when the bidirectional thruster moves toward the hand-changing hydraulic cylinders, it moves to a position flush with the hand-changing hydraulic cylinders.

3. According to claim 1, the steel truss bridge node jacking equipment, It is characterized in that It also includes a load-bearing support system, on which the load-bearing beam is fixed; a distribution beam is arranged on the load-bearing support system, on which the hand-changing hydraulic cylinder is arranged.

4. A construction process for a steel truss bridge cross-node jacking equipment using the steel truss bridge cross-node jacking equipment according to claim 1, It is characterized in that It includes a slideway arranged above the load-bearing beam, a bidirectional thruster arranged on the slideway and capable of bidirectional movement along the length direction of the slideway, and a hand-changing hydraulic cylinder that can be extended and retracted up and down in a direction perpendicular to the slideway; The construction process comprises the following steps: S1, the bidirectional thruster lifts the bridge upwards; S2, the bidirectional thruster moves along the direction of the slideway to push the bridge to a specific position; S3, the hand-changing hydraulic cylinder extends upward and supports the bridge; S4, the bidirectional thruster is separated from the bridge and moves in the reverse direction to a reverse setting position, and step S1 is continued until the bridge is pushed to the setting position; The bidirectional thruster comprises a push reaction seat for locking or releasing the slideway, a push hydraulic cylinder connected to the push reaction seat and capable of extending and retracting along the slideway, a sliding shoe pushed by the push hydraulic cylinder, and a lifting hydraulic cylinder arranged on the sliding shoe; a friction reducing plate is also arranged between the slideway and the sliding shoe; The single forward stroke in step S2 is: after the push reaction seat locks the slideway, the push hydraulic cylinder pushes the front end sliding shoe and the lifting hydraulic cylinder load thereon forward by one stroke, the push reaction seat releases the slideway, and the push hydraulic cylinder returns without load; The single return stroke in step S4 is: the push reaction seat releases the slideway, the push hydraulic cylinder extends one stroke without load, the push reaction seat locks the slideway, the push hydraulic cylinder retracts, and the sliding shoe and the lifting hydraulic cylinder thereon are pulled back one stroke.

5. According to the construction process of the steel truss bridge cross-node jacking equipment described in claim 4, It is characterized in that Also included is at least one joist detachably fixed to each node of the lower chord of the bridge; The step S1 specifically comprises: the bidirectional thruster lifts the joist upwards, so that the joist and the bridge are lifted as a whole; Specifically, the step S2 includes: the bidirectional propeller moves along the slideway to accumulate forward travel to push the bridge; The step S3 specifically includes: the hand-changing hydraulic cylinder extends upward to the joist and supports the joist and the bridge; Specifically, the step S4 is that the bidirectional thruster is separated from the support beam and moves in the reverse direction to accumulate a return stroke to a reverse setting position, and step S1 is continued until the bridge is pushed to the set position.

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