Construction method of lattice beam in special terrain environment

Abstract

The invention discloses a construction method of a grid beam in a special terrain environment. The construction method comprises the following steps: (1) arranging a slideway below a design position of the grid beam of a bridge; a traction mechanism is arranged at the starting end of each slide way, a reaction frame and a traction jack are arranged at the tail end of each slide way, and a sliding shoe capable of sliding is arranged between the starting end and the tail end of each slide way; (2) a traction jack is controlled to pull a sliding shoe, so that the sliding shoe drives the lattice beam to slide towards the tail end of the sliding way, and when the sliding shoe reaches the position under the designed position of the lattice beam section, the lattice beam section is jacked upwards to reach the designed position and is fixedly connected with the installed lattice beam section; and (3) a traction piece is connected with the sliding shoe, and the step (2) is repeated until all the lattice beam sections are installed. By the adoption of the method, the river-crossing construction problem when the grid beam serves as the main beam in the narrow terrain environment can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, in particular to a construction method of a lattice beam in a special terrain environment. Background Art

[0002] With the rapid development of transportation, bridge construction is also increasing. Consequently, environmental and ecological issues arising during construction are receiving increasing attention. Bridge construction must further meet the requirements of the era of green construction and sustainable development. To reduce the environmental impact of bridge construction, most bridge main beam segments are currently prefabricated in factories before being transported to the construction site for installation. This method effectively speeds up construction, reduces environmental pollution, and is more conducive to promoting standardized bridge construction and improving bridge quality.

[0003] For the installation of prefabricated bridge main beam segments, the more mature processes currently use the jacking method and the cable crane hoisting method. The jacking method refers to assembling the beam body section by section behind the abutment, and then using a jack to push the beam body longitudinally to make the beam body pass through the temporary sliding support surface on the top of each pier to put it into place. However, the jacking method requires close-range pier support, the construction cost is high and it is not suitable for large-span river crossing construction. The cable crane hoisting method is a construction method that uses a cable system to lift prefabricated main beam segments section by section to form a bridge structure. The system consists of main cables, working cables, towers and anchoring devices. The main cables are used to bear the lifting weight and provide a running track for the sports car. However, in some terrains with limited space, it is difficult to build towers and anchors.

[0004] Therefore, it is very necessary to find a construction method for prefabricated main beam segments in a narrow terrain environment. Summary of the Invention

[0005] The present invention provides a construction method for lattice beams in a special terrain environment, which can solve the problem of river-crossing construction when lattice beams are used as main beams in a narrow terrain environment.

[0006] To achieve the above object, the technical solution of the present invention is: A construction method for lattice beams in a special terrain environment comprises the following steps: (1) Slideway support mechanisms are respectively provided on the left and right sides below the designed position of the bridge lattice beam, and a distribution beam arranged along the transverse direction of the bridge is fixedly connected to the top of each slideway support mechanism at intervals, and a slideway is fixedly connected to the top of each distribution beam; A traction mechanism is provided at the starting end of each slideway, a reaction frame is provided at the end of the slideway, a pulling jack is provided on the reaction frame, a sliding shoe is provided between the starting end and the end end, and the sliding shoe is linearly connected to the steel strand of the pulling jack and the traction member of the traction mechanism; (2) The sliding shoe is stopped at the beginning of the slideway by the action of the steel strand and the traction member, and the lattice beam segment is hoisted onto the sliding shoe by a hoisting device and adjusted to a suitable position. Then, the connection between the traction member and the sliding shoe is released, and the pulling jack is controlled to pull the sliding shoe so that the sliding shoe drives the lattice beam segment to slide toward the end of the slideway. When the lattice beam segment reaches the designed position directly below the designed position, the lattice beam segment is lifted upward to reach the designed position and fixedly connected to the installed lattice beam segment. (3) Connect the traction member to the sliding shoe and repeat step (2) until all lattice beam segments are installed.

[0007] Preferably, the slipper includes a slipper base, a slipper support block and a lifting jack. The slipper base is penetrated by a sleeve along the sliding direction for accommodating the steel strand, and slipper support blocks are symmetrically arranged on both sides. The slipper support blocks are arranged along the direction of the bridge. The lifting jack is arranged between the two slipper support blocks. The piston rod of the lifting jack is lower than the height of the slipper support block when retracted, and higher than the height of the slipper support block when lifted.

[0008] More preferably, in step (2), jacking up the lattice beam segment to reach the designed position specifically includes: jacking up the lattice beam segment by a jacking jack, then padding a first steel plate in the vertical space between the lattice beam segment and the sliding shoe support block, then retracting the jacking jack, padding a second steel plate at the bottom of the jacking jack, then controlling the jacking jack to jack up the lattice beam segment, and continuing to pad the first steel plate in the vertical space between the first steel plate and the lattice beam segment, repeating the above steps until the lattice beam segment is jacked up to the designed elevation.

[0009] Preferably, the sliding shoe further comprises a limiting plate, a limiting connecting plate, a mounting plate, a mounting connecting plate and a deviation adjusting jack, at least two limiting plates are spaced apart in the middle of the left and right sides of the sliding shoe base, the limiting plates extend to the bottom of the sliding shoe base, the limiting connecting plate is connected to the inner side of the portion of the limiting plate on the same side extending to the bottom of the sliding shoe base, and the distance between the limiting connecting plates on the left and right sides can match the insertion of the slideway; at least two mounting plates are provided on both ends of the left and right sides of the sliding shoe base, the mounting plates extend to the bottom of the sliding shoe base, the mounting connecting plates are connected to the inner side of the portion of the mounting plate on the same side extending to the bottom of the sliding shoe base, a deviation adjusting jack is fixed to the inner side of the mounting connecting plates, and the deviation adjusting jack can be extended to support the slideway; In step (2), when the pulling jack pulls the sliding shoe to drive the lattice beam to slide, if the lateral deviation of the sliding shoe exceeds the threshold, the pulling of the pulling jack is temporarily stopped, and the lateral deviation of the sliding shoe is adjusted by the adjustment jack to reach the designed axial position before restarting the traction.

[0010] More preferably, the sliding shoe base is provided with at least two base partitions along the bridge direction, wherein two of the base partitions clamp the sleeve; The sliding shoe support block is provided with at least two support block partitions along the longitudinal direction of the bridge. The support block partitions correspond to the base partitions one by one and are located directly above the base partitions.

[0011] More preferably, the slide support mechanism includes piers, cross beams and longitudinal beams, and the piers are respectively arranged on the left and right sides below the bridge lattice beam, with at least two arranged on each side, and each of the piers is fixedly connected with at least two cross beams arranged along the transverse direction of the bridge, and the cross beams on the same side are connected with the longitudinal beams, and the longitudinal beams are constructed by Bailey plates, and at least three rows are arranged.

[0012] More preferably, the pier includes a pier foundation, columns, transverse connections and diagonal braces, the columns are fixedly connected to the pier foundation, the transverse connections are connected between the middle parts of the columns, the cross beams are connected to the tops, and the diagonal braces are connected between the cross beams and the columns near their outer ends.

[0013] More preferably, the following steps are further included: (4) the crossbeam is extended to the outside of the bridge lattice beam. After the installation of all lattice beam segments is completed, the sliding shoe is removed to release the connection between the longitudinal beam and the crossbeam, and the longitudinal beam, distribution beam and slide are pulled to the outer end of the crossbeam until they are not blocked by the bridge lattice beam, and then the longitudinal beam, distribution beam and slide are lifted out using a lifting device.

[0014] Preferably, a construction walkway is fixed between the distribution beam and the slideway, and guardrails are provided on the left and right sides of the construction walkway.

[0015] More preferably, a polytetrafluoroethylene slide plate is provided between the slideway and the slide shoe.

[0016] The above-mentioned construction method of lattice beams in special terrain environments has the following advantages: (1) The present invention solves the problem that cable cranes cannot be used to install underwater lattice beams in a narrow space by adopting a sliding construction method that combines sliding shoes and slideways.

[0017] (2) By placing the reaction frame and the traction mechanism on the sliding track, the traction force is converted from external force to internal force, which can reduce the horizontal force on the pier and reduce the material of the pier.

[0018] (3) The present invention further uses Bailey plates as longitudinal beams to span the river, which has good load-bearing capacity and integrity, and can also avoid excessive use of pier structures in the water to occupy the river channel, thereby ensuring the flood discharge capacity of the river channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a structural diagram of an embodiment of the present invention.

[0020] Figure 2 This is a left-view structural diagram of one of the pier locations.

[0021] Figure 3 This is a structural diagram of one of the slideway support mechanisms, distribution beams, and slideway connections.

[0022] Figure 4 It is a structural diagram of the connection between the reaction frame, the pulling jack and the sliding shoe.

[0023] Figure 5 It is a structural diagram of the connection between the traction mechanism and the sliding shoe.

[0024] Figure 6 It is an enlarged structural diagram of the sliding shoe.

[0025] Figure 7 yes Figure 6 Schematic diagram of the left view structure.

[0026] Figure 8 It is a structural diagram of the sliding shoe and the slide.

[0027] Figure 9 It is a structural diagram of a lattice beam segment being lifted by a lifting jack.

[0028] Figure 10 It is a structural diagram of the first steel plate after the lattice beam segment is lifted by the lifting jack.

[0029] In the figure, there are pier foundation 1, longitudinal beam 2, column 3, lattice beam segment 4, sliding shoe 5, sliding shoe support block 501, sliding shoe base 502, sleeve 503, mounting plate 504, mounting connecting plate 505, limit plate 506, limit connecting plate 507, base middle partition 508, support block middle partition 509, adjustment jack 510, slideway 6, construction walkway 7, distribution beam 8, cross beam 9, diagonal brace 10, transverse connection 11, pulling jack 12, steel strand 1201, reaction frame 13, lifting jack 14, traction mechanism 15, slide plate 16, and first steel plate 17. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0032] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0033] This embodiment uses lattice beams to construct the main beams. The left and right mentioned below refer to the relative positions of the left and right spans of the bridge. In this embodiment, the east side of the bridge is land, and the west side spans a river. The terrain on the east side is narrow, making it impossible to construct a pylon. Therefore, the main beams on the east side can be installed using in-situ hoisting. The main beams on the west side are constructed using the following method.

[0034] A construction method of lattice beams in special terrain environment, combined with Figure 1 As shown, the following steps are included: (1) Combination Figure 2-3 As shown, slideway support mechanisms are installed on the left and right sides below the designed position of the bridge lattice beam. Distribution beams 8, arranged along the transverse direction of the bridge, are fixedly connected to each slideway support mechanism at intervals. Slideways 6 are fixedly connected to the distribution beams 8. The distribution beams 8 can evenly transfer the load transmitted by the slideways 6 to the slideway support mechanisms. A traction mechanism 15 is installed at the beginning of each slideway 6, and a reaction frame 13 is installed at the end of the slideway 6. The reaction frame 13 is equipped with a pulling jack 12. A slidable sliding shoe 5 is installed between the beginning and end. The sliding shoe 5 is linearly connected to the steel strand 1201 of the pulling jack 12 and the pulling member of the traction mechanism 15.

[0035] (2) Combination Figure 4 and Figure 5As shown, the sliding shoe 5 is stopped at the beginning of the slideway 6 by the action of the steel strand 1201 and the traction member, the lattice beam segment 4 is hoisted onto the sliding shoe 5 by a lifting device and the position is adjusted, then the connection between the traction member and the sliding shoe 5 is released, the pulling jack 12 is controlled to pull the sliding shoe 5, so that the sliding shoe 5 drives the lattice beam segment 4 to slide toward the end of the slideway 6, and when it reaches the bottom of the designed position of the lattice beam segment 4, the lattice beam segment 4 is lifted upward to reach the designed position and fixedly connected to the installed lattice beam segment 4.

[0036] (3) Connect the traction piece to the sliding shoe 5 and repeat step (2) until all lattice beam segments 4 are installed.

[0037] In this embodiment, two slideways are provided, and two sliding shoes 5 are matched on each slideway 6. The sliding shoes 5 are respectively provided at positions near the front end and near the rear end on the left or right side of the lattice beam segment 4 to maintain the balance of the entire lattice beam segment 4. The steel strands 1201 pass through the two sliding shoes 5 in sequence, and a clamp is provided on the side of the sliding shoe 5 away from the pulling jack 12 to anchor the steel strands 1201. Since the clamp is provided on the side away from the pulling jack 12, in step (2), the lattice beam segment 4 is hoisted onto the sliding shoe 5 and the position is adjusted before the connection with the traction member is released. In this way, the two sliding shoes 5 can maintain a suitable distance between each other. After the lattice beam segment 4 falls on the sliding shoe 5, the sliding shoe 5 is not easily changed under the action of the gravity of the lattice beam segment 4.

[0038] In this embodiment, the starting end of the slideway 6 is located in the middle of the bridge, and the ending end is located at the west end of the bridge.

[0039] In this embodiment, the slideway 6 is made of three welded I45 I-beams, the distribution beam 8 is made of I20 I-beams with a spacing of 0.5-0.6m, the pulling jack 12 is a 50t continuous jack, the traction mechanism 15 is a winch, and the traction member is a steel wire rope.

[0040] Preferably, since the deadweight of the lattice beam segment 4 is relatively large, this embodiment provides a sliding shoe 5 structure that facilitates adjustment of the vertical position of the lattice beam segment 4. Figure 6-8As shown, the sliding shoe 5 includes a sliding shoe base 502, a sliding shoe support block 501 and a lifting jack 14. In this embodiment, the sliding shoe base 502 is penetrated by a sleeve 503 for accommodating the steel strand 1201 along the sliding direction, and sliding shoe support blocks 501 are symmetrically arranged on both sides. The sliding shoe support blocks 501 are arranged along the direction of the bridge. The sliding shoe base 502 and the sliding shoe support blocks 501 are both box-shaped structures surrounded by steel plates, which are convenient for processing. A lifting jack 14 is provided between the two sliding shoe support blocks 501. The lifting jack 14 is supported by the sliding shoe base 502. The piston rod of the lifting jack 14 is lower than the height of the sliding shoe support block 501 when retracted, and is higher than the height of the sliding shoe support block 501 when lifting. In step (2), lifting the lattice beam segment 4 upward to make it reach the designed position 4 specifically includes: combining Figure 9 As shown, the lattice beam segment 4 is lifted upward by the lifting jack 14, combined with Figure 10 As shown, the first steel plate 17 is placed in the vertical space between the lattice beam segment 4 and the sliding shoe support block 501, and then the lifting jack 14 is retracted. The second steel plate is placed at the bottom of the lifting jack 14. After the position of the lifting jack 14 is adjusted higher, the lifting jack 14 is controlled to lift the lattice beam segment 4 upward, and the first steel plate 17 is continued to be placed in the vertical space between the first steel plate 17 and the lattice beam segment 4. The above steps of placing the second steel plate, lifting with the lifting jack 14, and placing the first steel plate 17 are repeated until the lattice beam segment 4 is lifted to the designed elevation.

[0041] Preferably, combined Figure 6-8 As shown, the sliding shoe 5 further includes a limit plate 506, a limit connecting plate 507, a mounting plate 504, a mounting connecting plate 505 and an adjustment jack 510. At least two limit plates 506 are arranged at intervals in the middle of the left and right sides of the sliding shoe base 502. The limit plates 506 extend to the bottom of the sliding shoe base 502. The inner side of the limit plate 506 on the same side extending to the bottom of the sliding shoe base 502 is connected to the limit connecting plate 507. The distance between the limit connecting plates 507 on the left and right sides can match the insertion of the slideway 6 to prevent the sliding shoe 5 from deviating left and right on the slideway 6 to a certain extent; at least two mounting plates 504 are arranged at both ends of the left and right sides of the sliding shoe base 502. The mounting plates 504 extend to the bottom of the sliding shoe base 502. The inner side of the mounting plate 504 on the same side extending to the bottom of the sliding shoe base 502 is connected to the mounting connecting plate 505. The adjustment jack 510 is fixed inside the mounting connecting plate 505. Figure 8As shown, the deflection adjustment jack 510 can be extended to support the slideway 6. In this embodiment, the four corners of the bottom of the sliding shoe 5 are each provided with a deflection adjustment jack 510. By extending or retracting the deflection adjustment jack 510 at each corner, the left and right deflection of the sliding shoe 5 can be adjusted. Specifically, in step (2), when the pulling jack 12 pulls the sliding shoe 5 to drive the lattice beam segment 4 to slide, if the lateral deviation of the sliding shoe 5 exceeds the threshold, the pulling of the pulling jack 12 is temporarily stopped, and the lateral deflection of the sliding shoe 5 is adjusted to the designed axial position by the deflection adjustment jack 510, and then the pulling is restarted.

[0042] More preferably, to ensure the support strength of the sliding shoe 5, the sliding shoe base 502 is provided with at least two base partitions 508 along the longitudinal direction of the bridge, two of which clamp the sleeve 503. The sliding shoe support block 501 is provided with at least two support block partitions 509 along the longitudinal direction of the bridge, the support block partitions 509 corresponding one-to-one with the base partitions 508 and located directly above the base partitions 508. The addition of the base partitions 508 and the support block partitions 509 can effectively prevent the middle portion of the sliding shoe 5 from sinking and deforming.

[0043] More preferably, this embodiment provides a more specific slideway support mechanism, comprising buttresses, crossbeams 9, and longitudinal beams 2. The buttresses are disposed on the left and right sides below the bridge lattice beams, with at least two provided on each side. Each buttress is fixedly connected to at least two crossbeams 9 arranged transversely to the bridge. The crossbeams 9 on the same side are connected to longitudinal beams 2. The longitudinal beams 2 are constructed of Bailey plates, with at least three rows provided. In this embodiment, the crossbeams are constructed of double-jointed H700*300 steel or triple-jointed I45 I-beams, and four rows of Bailey plates are provided.

[0044] More preferably, combined Figure 2-3 As shown, the pier includes a pier foundation 1, a column 3, a transverse connection 11 and a diagonal brace 10. The pier foundation 1 can use the existing arch rib support foundation, and the location close to the land can use a concrete combined with steel pipe pile foundation, such as Figure 1 The leftmost pier foundation 1 has columns 3 fixedly connected to it, with transverse connections 11 connecting the middle of the columns 3 and cross beams 9 connected to the top. The cross beams 9 are arranged along the transverse direction of the bridge, and every two transversely arranged columns 3 are matched with a cross beam 9. A diagonal brace 10 is connected between the cross beam 9 and the columns 3 near their outer ends. The integrity and support stiffness of the pier are improved through the transverse connection 11, and the load of the longitudinal beam 2 can be more evenly transferred to the pier through the cross beam 9.

[0045] More preferably, this embodiment further provides a method for removing the slide 6 and the longitudinal beam 2, comprising the following steps: (4) the transverse beam 9 is extended to the outside of the bridge lattice beam. After all the lattice beam segments 4 are installed, the slide shoe 5 is first hoisted out from one end of the slide, and then the connection between the longitudinal beam 2 and the transverse beam 9 is released. The longitudinal beam 2, the distribution beam 8 and the slide 6 are pulled out to the outer end of the transverse beam 9 until they are not blocked by the bridge lattice beam, and then the longitudinal beam 2, the distribution beam 8 and the slide 6 are hoisted out using a hoisting device. The longitudinal beam 2, the distribution beam 8 and the slide 6 are pulled out horizontally, so that the longitudinal beam 2, the distribution beam 8 and the slide 6 are not blocked by the main beam of the bridge, and there is sufficient space to hoist them out. The method of pulling out horizontally can be to set an anchoring lug at the outer end of the transverse beam 9, and then use one end of a hand winch to hook the anchoring lug and the other end to buckle the longitudinal beam 2, and use the hand winch to pull out the longitudinal beam 2, the distribution beam 8 and the slide 6 as a whole.

[0046] Preferably, a construction walkway 7 is fixed between the distribution beam 8 and the slideway 6, and guardrails are provided on the left and right sides of the construction walkway 7, so that construction operations can be facilitated and construction safety can be ensured. The construction walkway 7 can be made of patterned steel plates.

[0047] More preferably, combined Figure 8 As shown, a polytetrafluoroethylene slide plate 16 is provided between the slideway 6 and the slide shoe 5 to reduce friction between the slideway 6 and the slide shoe 5 .

[0048] In addition, in step (2), the lattice beam segment 4 to be installed is connected to the lattice beam segment 4 that has been installed. The specific steps include: installing a hand winch at the left and right ends of the lattice beam segment 4 that has been installed, and the movable ends of the wire rope of the hand winch are respectively connected to both sides of the middle part of one end of the lattice beam segment 4 to be installed, and by adjusting the length of the wire rope of the hand winch, the left and right positions of the lattice beam segment 4 to be installed are preliminarily adjusted. After the preliminary adjustment of the left and right positions is completed, the movable ends of the wire rope of the hand winch are adjusted to the ends of both sides of the lattice beam segment 4 to be installed, and the lattice beam segment 4 to be installed is pulled to the lattice beam segment 4 that has been installed, and the lattice beam segment 4 to be installed is installed on the bottom surface of the end of the lattice beam segment 4 that has been installed. Install the first horse plate, then retract the jacking jack 14, and move one end of the lattice beam segment 4 to be installed downward to the top of the first horse plate. At this time, the adjustment of the upper and lower positions is completed, and an L-shaped second horse plate is installed at the end of the installed lattice beam segment 4. The second horse plate extends to the end of the lattice beam segment 4 to be installed, and a fine-adjustment jack is installed at the end of the lattice beam segment 4 to be installed. The fine-adjustment jack is located on the inner side of the second horse plate, and the ends on both sides of the lattice beam segment 4 to be installed are provided with fine-adjustment jacks. The two fine-adjustment jacks are coordinated to extend or retract to make the lattice beam segment 4 to be installed move left or right, and the left and right fine-adjustment of the lattice beam segment 4 to be installed is completed. After the left and right fine-adjustment is completed, welding can be carried out.

[0049] In addition, it should be noted that this embodiment illustrates one of the methods of the present invention, which is construction from the middle of the bridge to the other end. Of course, according to the actual situation of the bridge crossing the river, the method of the present invention can also be applied to the construction of the entire bridge main beam, that is, the installation of lattice beam segments from one end to the other end of the bridge can adopt the construction method of the present invention.

[0050] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A construction method for lattice beams in special terrain environments, characterized in that The following steps are involved: (1) Slideway support mechanisms are respectively provided on the left and right sides below the designed position of the bridge lattice beam, and a distribution beam arranged along the transverse direction of the bridge is fixedly connected to the top of each slideway support mechanism at intervals, and a slideway is fixedly connected to the top of each distribution beam; A traction mechanism is provided at the starting end of each slideway, a reaction frame is provided at the end of the slideway, a pulling jack is provided on the reaction frame, a sliding shoe is provided between the starting end and the end end, and the sliding shoe is linearly connected to the steel strand of the pulling jack and the traction member of the traction mechanism; (2) The sliding shoe is stopped at the beginning of the slideway by the action of the steel strand and the traction member, and the lattice beam segment is hoisted onto the sliding shoe by a hoisting device and adjusted to a suitable position. Then, the connection between the traction member and the sliding shoe is released, and the pulling jack is controlled to pull the sliding shoe so that the sliding shoe drives the lattice beam segment to slide toward the end of the slideway. When the lattice beam segment reaches the designed position directly below the designed position, the lattice beam segment is lifted upward to reach the designed position and fixedly connected to the installed lattice beam segment. (3) Connect the traction member to the sliding shoe and repeat step (2) until all lattice beam segments are installed.

2. The method for constructing lattice beams in special terrain environments according to claim 1, characterized in that: The sliding shoe includes a sliding shoe base, a sliding shoe support block and a lifting jack. The sliding shoe base is penetrated by a sleeve for accommodating the steel strand along the sliding direction, and sliding shoe support blocks are symmetrically arranged on both sides. The sliding shoe support blocks are arranged along the direction of the bridge. The lifting jack is arranged between the two sliding shoe support blocks. The piston rod of the lifting jack is lower than the height of the sliding shoe support block when retracted, and higher than the height of the sliding shoe support block when lifting.

3. The method for constructing lattice beams in special terrain environments according to claim 2, characterized in that: In step (2), jacking up the lattice beam segment to make it reach the designed position specifically includes: jacking up the lattice beam segment by means of a jacking jack, then padding a first steel plate in the vertical space between the lattice beam segment and the sliding shoe support block, then retracting the jacking jack, padding a second steel plate at the bottom of the jacking jack, then controlling the jacking jack to jack up the lattice beam segment, and continuing to pad the first steel plate in the vertical space between the first steel plate and the lattice beam segment, and repeating the above steps until the lattice beam segment is jacked up to the designed elevation.

4. The method for constructing lattice beams in special terrain environments according to claim 2, characterized in that: The sliding shoe further includes a limiting plate, a limiting connecting plate, a mounting plate, a mounting connecting plate and a deviation adjusting jack, at least two limiting plates are spaced apart in the middle of the left and right sides of the sliding shoe base, the limiting plates extend to the bottom of the sliding shoe base, the limiting connecting plate is connected to the inner side of the portion of the limiting plate on the same side extending to the bottom of the sliding shoe base, and the distance between the limiting connecting plates on the left and right sides can match and be inserted into the slideway; at least two mounting plates are provided on both ends of the left and right sides of the sliding shoe base, the mounting plates extend to the bottom of the sliding shoe base, the mounting connecting plates are connected to the inner side of the portion of the mounting plate on the same side extending to the bottom of the sliding shoe base, a deviation adjusting jack is fixed to the inner side of the mounting connecting plates, and the deviation adjusting jack can be extended to support the slideway; In step (2), when the pulling jack pulls the sliding shoe to drive the lattice beam to slide, if the lateral deviation of the sliding shoe exceeds the threshold, the pulling of the pulling jack is temporarily stopped, and the lateral deviation of the sliding shoe is adjusted by the adjustment jack to reach the designed axial position before restarting the traction.

5. The method for constructing lattice beams in special terrain environments according to claim 2, characterized in that: The sliding shoe base is provided with at least two base partitions along the bridge direction, wherein two of the base partitions clamp the sleeve; The sliding shoe support block is provided with at least two support block partitions along the longitudinal direction of the bridge. The support block partitions correspond to the base partitions one by one and are located directly above the base partitions.

6. The method for constructing lattice beams in special terrain environments according to claim 1, characterized in that: The slideway support mechanism includes piers, cross beams and longitudinal beams. The piers are respectively arranged on the left and right sides below the bridge lattice beam, with at least two arranged on each side. At least two cross beams arranged along the transverse direction of the bridge are fixedly connected to each pier, and the cross beams on the same side are connected to the longitudinal beams. The longitudinal beams are constructed by Bailey plates, and at least three rows are arranged.

7. The method for constructing lattice beams in special terrain environments according to claim 6, characterized in that: The pier includes a pier foundation, columns, transverse connections and diagonal braces. The columns are fixedly connected to the pier foundation, the transverse connections are connected between the middle parts of the columns, the tops are connected to the cross beams, and the diagonal braces are connected between the cross beams and the columns near their outer ends.

8. The method for constructing lattice beams in special terrain environments according to claim 7, characterized in that: The following steps are also included: (4) the crossbeam is extended to the outside of the bridge lattice beam. After the installation of all lattice beam segments is completed, the sliding shoe is removed to release the connection between the longitudinal beam and the crossbeam, and the longitudinal beam, distribution beam and slide are pulled to the outer end of the crossbeam until they are not blocked by the bridge lattice beam, and then the longitudinal beam, distribution beam and slide are lifted out using a lifting device.

9. The method for constructing lattice beams in special terrain environments according to claim 1, characterized in that: A construction walkway is also fixed between the distribution beam and the slideway, and guardrails are provided on the left and right sides of the construction walkway.

10. The method for constructing lattice beams in special terrain environments according to claim 1, characterized in that: A polytetrafluoroethylene slide plate is provided between the slideway and the slide shoe.

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