Construction device and method for large-span steel trestle in deep canyon areas

Abstract

The present invention provides a large-span steel trestle construction device and method in a deep canyon area, including a No. 1 bridge pier and a No. 2 bridge pier arranged on both sides of the river valley, a No. 0 bridge abutment is arranged on the outer side of the No. 1 bridge pier, a reaction frame is arranged on the No. 0 bridge abutment, a No. 3 bridge abutment is arranged on the outer side of the No. 2 bridge pier, an L-shaped support seat is arranged on the No. 3 bridge abutment, the No. 1 bridge pier and the No. 2 bridge pier are respectively connected with a guide frame and a traction frame through steel pipe piles, and the traction frame pulls the military beam from the No. 0 bridge abutment to the L-shaped support seat through a cable. The present invention is safe and efficient in construction, fully combines the on-site operation conditions, and can successfully install a large-span steel temporary bridge with a main span of 40m without large-scale mechanical equipment. The overall operation is convenient and the cost is low. It overcomes the limitations of the terrain environment and has good economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of trestle construction, and in particular to a large-span steel trestle construction device and method in a deep canyon area. Background Art

[0002] With the economic development of society, the demand for convenient transportation is becoming more and more urgent. However, due to the natural differences in the geographical environment, for deep canyon areas, multiple factors need to be considered comprehensively when building bridges. The river blocks the passage on both sides, and large equipment cannot enter the site well. Even if it enters the site, it is restricted by terrain and safety factors, and the range of movement is limited, and it cannot play a good role. In addition, the use cost of large equipment is high, resulting in poor construction economy of the trestle, and the adjustment is relatively troublesome. Chinese patent CN102979039A records a method for constructing a high-level trestle on steep bare rocks without a covering layer in deep water rapids, but the scheme uses a crawler crane in the process of placing the trestle. As mentioned above, due to the limitations of the site and span, the size and lifting tonnage of the crawler crane cannot guarantee that the construction requirements of the trestle can be met. Therefore, there are defects in its use and it needs to be improved. Summary of the invention

[0003] The present invention provides a large-span steel trestle construction device and method in deep canyon areas, which solves the problems that during the construction of large-span trestle in the canyon, a crane is needed for hoisting, the crane cannot guarantee the safety and efficiency during construction, and it cannot be widely promoted and is greatly affected by the geographical environment and span.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a large-span steel trestle construction device in deep canyon areas, including pier No. 1 and pier No. 2 arranged on both sides of the river valley, abutment No. 0 is arranged on the outer side of pier No. 1, and a reaction frame is arranged on abutment No. 0, abutment No. 3 is arranged on the outer side of pier No. 2, and an L-shaped support seat is arranged on abutment No. 3, pier No. 1 and pier No. 2 are respectively connected with a guide frame and a traction frame through steel pipe piles, and the traction frame pulls the military beam from abutment No. 0 to the L-shaped support seat through cables.

[0005] In the preferred solution, the bottoms of the reaction frame, the guide frame and the traction frame are respectively detachably provided with flat rollers, and the military beam is slidably arranged on the flat rollers.

[0006] In the preferred embodiment, a nose bridge is provided at the end of the military beam, a mounting point is provided on the side close to the nose bridge, the nose bridge and the mounting point are respectively connected to the cable, a saddle is provided on the top of the traction frame, a first guide wheel is provided on the upper part of the first guide wheel, a second guide wheel is provided on the upper part of the L-shaped support seat, and the cables are respectively wound around the saddle, the first guide wheel and the second guide wheel.

[0007] In the preferred solution, a saddle is provided on the top of the guide frame, a removable and symmetrically arranged positive positioning device is provided on the upper part of the military beam, a first pulley is provided on the upper part of the positive positioning device, a balancing positioning device is provided on the outer side of the middle part of the two positive positioning devices, a second pulley is provided on the upper part of the balancing positioning device, one side of the cable is respectively wound around the second pulley and the first pulley, and the other side of the cable is connected to the saddle.

[0008] In the preferred solution, the top of the military beam includes two upper chords arranged in parallel, the two upper chords are connected by a transverse connecting plate, a detachable balancing device is provided on the upper chord, a convex plate is symmetrically provided on the upper side of the transverse connecting plate, a vertical connecting plate is provided at the lower part of the upper chord, a positive position holding device is connected to the transverse connecting plate, and the balancing device is connected to the upper chord;

[0009] The positive position holding device comprises a clamping seat, a first through slot is provided on the clamping seat, the first through slot is clamped with the transverse connecting plate, a first baffle is parallelly provided on the upper part of the clamping seat, a fixing seat is provided between the two first baffles, a first pulley is provided on the fixing seat, a first screw is provided outside the first baffle, an insert is provided outside the first screw, a first slot and a second screw are respectively provided on both sides of the insert, the first slot is plugged with the convex plate, and the second screw and the first screw are connected through a positive and negative thread sleeve;

[0010] The balancing positioning device comprises a bonding plate, a top plate is provided at the top of the bonding plate, an end portion of the top plate is provided with a first side plate, and the second pulley is rotatably arranged on the mounting plate, the mounting plate and the top plate are connected, the bonding plate, the top plate and the first side plate form a limiting area, the upper chord rod is penetrated in the limiting area, a first avoidance opening is provided in the middle of the first side plate, two sides of the first avoidance opening are respectively provided with a first threaded hole and a first through hole, a locking rod is threadedly connected in the first through hole, a guide rod is penetrated in the first threaded hole, a movable seat is threadedly connected at the end portion of the guide rod, a second through groove is provided on the movable seat, the second through groove is clamped on the horizontal connecting plate, a second side plate is provided at the top of the movable seat, a second avoidance opening is provided on the second side plate, a second clamping groove is penetrated on the movable seat, the second clamping groove and the upper chord rod are plugged, an ear plate is provided on the outside of the bonding plate, a round rod is penetrated in the ear plate, a bottom plate is provided at the bottom of the round rod, a spring is sleeved on the round rod, the bottom plate abuts against the bottom of the upper chord rod, a third avoidance opening is provided on the bottom plate, and the vertical connecting plate is located in the third avoidance opening.

[0011] In the preferred solution, a plurality of second threaded holes are provided on the top plate, a plurality of second through holes are provided on the mounting plate, the locking pins are threadedly connected with the second threaded holes, the second pulley sleeve is provided on the fixed shaft, the fixed shaft and the mounting plate are fixedly connected, a round table and a connecting table are provided on both sides of the locking rod, a third through hole is provided on the ear plate, the round rod is passed through the third through hole, locking holes are provided on both sides of the third through hole, locking rods are provided on both sides of the round rod, the locking rods are passed through the locking holes, and an adapter plate is detachably provided at the bottom of the bottom plate, and a pull rod is passed through the adapter plate;

[0012] The first baffle plate is provided with a first through hole, and the first through hole is connected to a lap plate through a screw assembly. The lap plate includes symmetrically arranged supporting feet, and the supporting feet are provided with a second through hole. The two supporting feet are connected through a supporting plate, and baffles are respectively provided on both sides of the supporting plate. An avoidance groove is provided on the side of the supporting plate away from the supporting feet, and a force-bearing plate is provided at the lower part of the supporting feet, and the force-bearing plate is abutted against the outer side of the clamping seat. A rounded corner area is provided at one end of the baffle plate close to the supporting feet.

[0013] A construction method of a large-span steel trestle construction device in a deep canyon area comprises the following steps:

[0014] S1, cast bridge piers No. 1 and No. 2 on both sides of the river valley, and cast bridge abutments No. 0 and No. 3 on both sides;

[0015] S2. After the curing strength is reached, the reaction frame, guide frame, traction frame, L-shaped support seat and steel pipe piles are installed in sequence;

[0016] S3, respectively install flat rollers on the reaction frame, the guide frame and the traction frame;

[0017] S4. Install a military beam on one side of the zero abutment, place one side of the military beam on a flat roller, and install a nose bridge on the other side of the military beam;

[0018] S5, fix the nose bridge and the mounting point with cables, and then push the military beam to the designed position and stop;

[0019] S6. Adjust the position of the cable, wind the cable around the saddle on the top of the traction frame, and then wind it around the first guide wheel and the second guide wheel in sequence. After the preparation is completed, continue to push the military beam forward;

[0020] S7. After both sides of the military beam are respectively placed on the L-shaped support seat and the zero bridge abutment, the military beam is fixed;

[0021] S8. Dismantle the reaction frame, guide frame and traction frame in sequence, and carry out paving work on the surface of the military beam.

[0022] In the preferred solution, S1 includes the site selection of the trestle. The coordinates of each sampling point are obtained by a total station during the site selection process, and then determined after multi-factor analysis and then laid out for construction.

[0023] In the preferred solution, when a single section of military beam is pushed into place, S4-S7 is cycled until all military beams are pushed in. During the pushing process, the cable must be kept in a taut stressed state and the recommended direction of the military beam must be accurate.

[0024] In the preferred solution, before pouring the zero abutment in S1, the backfill soil residue needs to be backfilled to form the bottom foundation.

[0025] The beneficial effects of the present invention are as follows: by setting a reaction frame, a guide frame and a traction frame, the military beam can be quickly towed and pushed. The cables used in this project transport materials horizontally, and the guide frame on the No. 2 pier vertically lifts the military beam for a top-pushing construction process. This scheme fully combines the on-site working conditions, and successfully installs a large-span steel temporary bridge with a main span of 40m without using large-scale mechanical equipment. The process of this scheme has the advantages of strong innovation, high safety, and low cost. At the same time, the set positive position holding device and the balanced positioning device ensure that the overall force of the military beam is stable during the construction process, the position of the push is accurate, the workload of the overall adjustment is reduced, the construction efficiency is guaranteed, and it has good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0027] Figure 1 It is the construction schematic diagram state 1 of the present invention;

[0028] Figure 2 This is the construction schematic diagram state 2 of the present invention;

[0029] Figure 3 It is the construction schematic diagram state three of the present invention;

[0030] Figure 4 It is the construction schematic diagram state 4 of the present invention;

[0031] Figure 5 It is the construction schematic diagram state five of the present invention;

[0032] Figure 6 It is the construction schematic diagram state six of the present invention;

[0033] Figure 7 It is the construction schematic diagram state seven of the present invention;

[0034] Figure 8 It is the construction schematic diagram state eight of the present invention;

[0035] Fig. 9 This is a right side view schematic diagram of the construction state 1 of the present invention;

[0036] Fig.10 It is the second state of the right side view schematic diagram of the construction of the present invention;

[0037] Fig.11 It is a schematic diagram of a military beam with a guide frame towing and equipped with a positive position holding device and a balanced position device according to the present invention;

[0038] Fig.12 It is the first state of the military beam installation positive position holding device and the balanced position device of the present invention;

[0039] Fig.13This is the second state of the military beam installation positive position holding device and the balanced position device of the present invention;

[0040] Fig.14 It is a schematic diagram of the military beam installation positive position holding device and the balance position device;

[0041] Fig.15 yes Fig.14 Schematic diagram of explosion structure state 1;

[0042] Fig.16 yes Fig.14 Schematic diagram of the explosion structure in state 2;

[0043] Fig.17 yes Fig.14 Schematic diagram of the explosion structure of state three;

[0044] Fig.18 yes Fig.14 Schematic diagram of explosion structure state four;

[0045] Fig.19 yes Fig.18 A magnified schematic diagram of point A;

[0046] Fig. 20 yes Fig. 20 An enlarged schematic diagram of point B;

[0047] Fig.21 yes Fig.14 Schematic diagram of the base plate;

[0048] Fig. 22 yes Fig.11 Schematic diagram of the lap plate.

[0049] In the figure: bridge abutment 0 1; bridge pier 1 2; bridge pier 2 3; bridge abutment 3 4; reaction frame 5; guide frame 6; first frame 601; partition 602; traction frame 7; second frame 701; flat joint 702; diagonal brace 703; L-shaped support seat 8; flat roller 9; first guide wheel 10; second guide wheel 11; saddle 12; nose bridge 13; mounting point 14; backfill slag 15; steel pipe pile 16; cable 17; military beam 18; upper chord 1801; horizontal contact plate 1802; vertical contact plate 1803; convex plate 1804; positive position holding device 19; clamping seat 1901; first through slot 1902; fixed seat 1903; first pulley 1904; first baffle 1905; first screw 1906; insert block 1907; first slot 1908; second screw 1909; positive and negative thread sleeve 1910; first through hole 1911; screw assembly 1912; lap plate 1913; support foot 1914; second through hole 1 915; support plate 1916; baffle plate 1917; avoidance groove 1918; force plate 1919; fillet area 1920; balance positioning device 20; bonding plate 2001; top plate 2002; first side plate 2003; limiting area 2004; first through hole 2005; first threaded hole 2006; guide rod 2007; locking rod 2008; round table 2009; connecting table 2010; first avoidance opening 2011; second threaded hole 2012; mounting plate 2013; second pulley 2014; fixed shaft 2015; locking pin 2016; second through hole 2017; movable seat 2018; second through slot 2019; second slot 2020; second side plate 2021; second avoidance opening 2022; ear plate 2023; third through hole 2024; bottom plate 2025; round rod 2026; spring 2027; locking rod 2028; locking hole 2029; third avoidance opening 2030; adapter plate 21; pull rod 22. DETAILED DESCRIPTION

[0050] Example 1

[0051] like Figure 1-22A large-span steel trestle construction device for deep canyon areas is disclosed, including a No. 1 bridge pier 2 and a No. 2 bridge pier 3 arranged on both sides of the river valley, a No. 0 bridge abutment 1 is arranged on the outer side of the No. 1 bridge pier 2, a reaction frame 5 is arranged on the No. 0 bridge abutment 1, a No. 3 bridge abutment 4 is arranged on the outer side of the No. 2 bridge pier 3, an L-shaped support seat 8 is arranged on the No. 3 bridge abutment 4, the No. 1 bridge pier 2 and the No. 2 bridge pier 3 are respectively connected with a guide frame 6 and a traction frame 7 through steel pipe piles 16, and the traction frame 7 pulls a military beam 18 from the No. 0 bridge abutment 1 to the L-shaped support seat 8 through a cable 17. With this structure, the No. 1 bridge pier 2 and the No. 2 bridge pier 3 serve as the main load-bearing foundation of the main span, and the No. 0 bridge abutment 1 and the No. 3 bridge abutment 4 play an auxiliary role, which is beneficial to the support of the military beam 18 during the construction process. One side of the military beam 18 is passed through the reaction frame 5 to avoid overturning. The reaction frame 5 has the following functions: first, to prevent the military beam 18 from tilting at one end due to uneven weight at both ends of the support point during the jacking operation, and second, to limit the position laterally to prevent lateral displacement during the jacking operation of the military beam 18, making the force more stable; the guide frame 6 has the following functions: first, to limit the position of the military beam 18 laterally, and second, to apply horizontal auxiliary mechanical thrust to the military beam 18 through a hand winch, control the moving speed of the military beam, and fine-tune the forward displacement of the military beam; during construction, a plurality of partitions 602 are arranged on the first frame 601 of the guide frame 6, and the passage between two adjacent partitions 602 is the passage for the military beam 18, which further ensures the accurate position of the military beam jacking. The traction frame 7 has the following functions: first, to prevent the military beam 18 across the suspended end from sinking during the pushing operation; second, to apply a horizontal traction force to the military beam 18 to move the military beam 18 forward.

[0052] In the preferred solution, the bottoms of the reaction frame 5, the guide frame 6 and the traction frame 7 are respectively detachably provided with flat rollers 9, and the military beam 18 is slidably arranged on the flat rollers 9. With this structure, the military beam 18 is subjected to a stable force during its movement, and the contact area is small, the friction resistance is smaller, and it is more convenient to operate.

[0053] In the preferred solution, a nose bridge 13 is provided at the end of the military beam 18, a mounting point 14 is provided on the side close to the nose bridge 13, the nose bridge 13 and the mounting point 14 are respectively connected to the cable 17, a saddle 12 is provided on the top of the traction frame 7, a first guide wheel 10 is provided on the upper part of the first guide wheel 10, a second guide wheel 11 is provided on the upper part of the L-shaped support seat 8, and the cable 17 is respectively wound around the saddle 12, the first guide wheel 10 and the second guide wheel 11. With this structure, the military beam 18 is more stably stressed, and the nose bridge 13 plays an auxiliary role, extending the stress point of the military beam 18, and the military beam 18 can be better pulled from the front through the nose bridge 13 and the mounting point 14, and the overall traction effect is better. At the same time, the saddle 12 cooperates with the first guide wheel 10 and the second guide wheel 11 to change the direction of the force, ensuring the convenience of overall operation and the safety of construction.

[0054] In the preferred solution, a saddle 12 is provided on the top of the guide frame 6, and a detachable and symmetrically arranged position-keeping device 19 is provided on the upper part of the military beam 18, and a first pulley 1904 is provided on the upper part of the position-keeping device 19, and a balancing position-keeping device 20 is provided on the middle outer side of the two position-keeping devices 19, and a second pulley 2014 is provided on the upper part of the balancing position-keeping device 20, and one side of the cable 17 is respectively wound around the second pulley 2014 and the first pulley 1904, and the other side of the cable 17 is connected to the saddle 12. With this structure, the two first pulleys 1904 and the second pulley 2014 form a triangular configuration, which ensures that the forces on both sides of the military beam 18 are always in a stable and synchronous state, and the overall movement is more accurate, and the contact between the second pulley 2014 and the first pulley 1904 and the cable 17 is more stable and gentle, avoiding the problem that the cable 17 is not sufficiently stressed and the service life is limited due to the natural bending and friction problems when the cable 17 is directly fixed on the military beam 18.

[0055] In the preferred solution, the top of the military beam 18 includes two upper chords 1801 arranged in parallel, the two upper chords 1801 are connected by a transverse connecting plate 1802, the upper chord 1801 is detachably provided with a balancing positioning device 20, the upper side of the transverse connecting plate 1802 is symmetrically provided with a convex plate 1804, the lower part of the upper chord 1801 is provided with a vertical connecting plate 1803, the positive position holding device 19 is connected to the transverse connecting plate 1802, and the balancing positioning device 20 is connected to the upper chord 1801;

[0056] The positive position holding device 19 includes a clamping seat 1901, on which a first through slot 1902 is provided, the first through slot 1902 is clamped with the horizontal contact plate 1802, a first baffle 1905 is parallelly provided on the upper part of the clamping seat 1901, a fixing seat 1903 is provided between the two first baffles 1905, a first pulley 1904 is provided on the fixing seat 1903, a first screw 1906 is provided outside the first baffle 1905, an insert block 1907 is provided outside the first screw 1906, a first slot 1908 and a second screw 1909 are respectively provided on both sides of the insert block 1907, the first slot 1908 is plugged with the convex plate 1804, and the second screw 1909 and the first screw 1906 are connected through a positive and negative thread sleeve 1910;

[0057] The balancing device 20 comprises a bonding plate 2001, a top plate 2002 is provided on the upper part of the bonding plate 2001, a first side plate 2003 is provided at the end of the top plate 2002, a second pulley 2014 is rotatably arranged on the mounting plate 2013, the mounting plate 2013 and the top plate 2002 are connected, the bonding plate 2001, the top plate 2002 and the first side plate 2003 form a limiting area 2004, the upper chord rod 1801 is penetrated in the limiting area 2004, a first avoidance opening 2011 is provided in the middle of the first side plate 2003, a first threaded hole 2006 and a first through hole 2005 are respectively provided on both sides of the first avoidance opening 2011, a locking rod 2008 is threadedly connected to the first through hole 2005, a guide rod 2007 is penetrated in the first threaded hole 2006, and a movable rod 2007 is threadedly connected to the end of the guide rod 2007 The movable seat 2018 is provided with a second through slot 2019, and the second through slot 2019 is clamped on the horizontal connecting plate 1802. The upper part of the movable seat 2018 is provided with a second side plate 2021, and the second side plate 2021 is provided with a second avoidance opening 2022. The movable seat 2018 is penetrated with a second card slot 2020, and the second card slot 2020 is plugged with the upper chord rod 1801. The outside of the fitting plate 2001 is provided with an ear plate 2023, and a round rod 2026 is penetrated in the ear plate 2023. A bottom plate 2025 is provided at the bottom of the round rod 2026, and a spring 2027 is sleeved on the round rod 2026. The bottom plate 2025 abuts against the bottom of the upper chord rod 1801, and a third avoidance opening 2030 is provided on the bottom plate 2025. The vertical connecting plate 1803 is located in the third avoidance opening 2030. With this structure, the positioning holding device and the balancing device can be quickly installed by utilizing the structural characteristics of the military beam 18 itself, while avoiding damage to the various components of the military beam 18, and can be completely fitted to the surface of the military beam 18 to form a stable and strong bearing capacity, and can be disassembled and reused many times, making installation and maintenance convenient.

[0058] In the preferred solution, a plurality of second threaded holes 2012 are provided on the top plate 2002, a plurality of second through holes 2017 are provided on the mounting plate 2013, the locking pin 2016 is threadedly connected with the second threaded hole 2012, the second pulley 2014 is sleeved on the fixed shaft 2015, the fixed shaft 2015 and the mounting plate 2013 are fixedly connected, a round table 2009 and a connecting table 2010 are respectively provided on both sides of the locking rod 2008, a third through hole 2024 is provided on the ear plate 2023, a round rod 2026 is penetrated in the third through hole 2024, locking holes 2029 are respectively provided on both sides of the third through hole 2024, locking rods 2028 are respectively provided on both sides of the round rod 2026, and the locking rods 2028 are penetrated in the locking holes 2029, and a removable adapter plate 21 is provided at the bottom of the bottom plate 2025, and a pull rod 22 is penetrated on the adapter plate 21;

[0059] The first baffle plate 1905 is provided with a first through hole 1911, and the first through hole 1911 is connected to a lap plate 1913 through a screw assembly 1912. The lap plate 1913 includes symmetrically arranged supporting feet 1914, and the supporting feet 1914 are provided with a second through hole 1915. The two supporting feet 1914 are connected through a supporting plate 1916, and baffle plates 1917 are respectively provided on both sides of the supporting plate 1916. A side of the supporting plate 1916 away from the supporting feet 1914 is provided with an avoidance groove 1918, and a force-bearing plate 1919 is provided at the lower part of the supporting feet 1914, and the force-bearing plate 1919 abuts against the outer side of the clamping seat 1901. The end of the baffle plate 1917 close to the supporting feet 1914 is provided with a rounded corner area 1920. The two sides of the saddle 12 on the guide frame 6 are respectively fitted with the inner side of the avoidance groove 1918. Thus, the structure ensures stable force and easy operation. Due to its own gravity, the head of the lap plate 1913 is always in contact with the guide frame 6. The contact between the saddle 12 and the avoidance groove 1918 is used to laterally limit the lap plate 1913, and the lap plate 1913 restricts the cable 17, ensuring that the cable 17 is always accurately pulled along the direction of the bridge. During the construction process, a manual hoist is needed to pull the military beam 18 from the tail, which can reduce the bearing capacity of the military beam 18 on the flat roller 9, reduce rolling friction, and make movement more convenient.

[0060] A construction method of a large-span steel trestle construction device in a deep canyon area comprises the following steps:

[0061] S1, cast bridge pier No. 1 2 and bridge pier No. 2 3 on both sides of the river valley, and cast bridge abutment No. 0 1 and bridge abutment No. 3 4 on both sides;

[0062] S2. After reaching the curing strength, the reaction frame 5, the guide frame 6, the traction frame 7, the L-shaped support seat 8 and the steel pipe pile 16 are installed in place in sequence; the traction frame 7 includes a second frame body 701, and a diagonal brace 703 is installed on the outside of the second frame body 701, and the diagonal brace 703 is connected to the second frame body 701 through a flat joint 702;

[0063] S3, respectively install the flat roller 9 on the reaction frame 5, the guide frame 6 and the traction frame 7;

[0064] S4, installing a military beam 18 on one side of the zero bridge abutment 1, placing one side of the military beam 18 on the flat roller 9, and installing a nose bridge 13 on the other side of the military beam 18;

[0065] S5, fix the nose bridge 13 and the mounting point 14 by means of the cable 17, and then push the military beam 18 to the designed position and stop;

[0066] S6, adjust the position of the cable 17, wind the cable 17 around the saddle 12 on the top of the traction frame 7, and then wind it around the first guide wheel 10 and the second guide wheel 11 in sequence. After the preparation is completed, continue to push the military beam 18;

[0067] S7, after the two sides of the military beam 18 are respectively placed on the L-shaped support seat 8 and the zero bridge abutment 1, the military beam 18 is fixed;

[0068] S8. Disassemble the reaction frame 5, the guide frame 6 and the traction frame 7 in sequence, and perform paving work on the surface of the military beam 18.

[0069] In the preferred solution, S1 includes the site selection of the trestle. The site selection process uses a total station to obtain the coordinates of each sampling point, and then determines the layout and construction after multi-factor analysis. The site selection of the trestle needs to comprehensively consider the length and slope of the sidewalks on both sides, the amount of construction work on the sidewalks, safety risk factors, river width, water depth, flow rate, geological conditions on both sides, the span and transportation capacity of the trestle, the sidewalk construction plan, and the cost factors related to the trestle structure design.

[0070] In the preferred solution, when a single section of military beam 18 is pushed into place, S4-S7 is cycled until all military beams 18 are pushed in. During the pushing process, it is necessary to ensure that the cable 17 is in a taut stressed state and ensure that the recommended direction of the military beam 18 is accurate.

[0071] In a preferred solution, before pouring the zero abutment 1 in S1, it is necessary to backfill the backfill soil residue 15 to form a bottom foundation.

[0072] Embodiment 2:

[0073] The total design length of the temporary bridge is 68m, the span is arranged as 16m+40m+12m, the bridge deck is 4.5m wide, the steel trestle deck elevation is 2392.938m, and the measured water level elevation in the dry season is 2380.85m. By consulting hydrological data to analyze and calculate the waterlogging and flood discharge, the design water level for a flood once in ten years is +2385.66, and the water flow rate is 4.79m / s.

[0074] The maximum design load of the steel trestle is 55t, and the maximum speed limit is 10km / h. Load and speed limit signs are clearly set at the bridge head.

[0075] The abutment is a light abutment, the pier is a double row of φ820×12mm spiral steel pipe, and the foundation is a concrete expanded foundation. The main pier crossbeam is 2×I 56b I-beam, the main longitudinal beam is 64 military beam and 2.0m end frame, the distribution beam is I 14 I-beam (spacing 40cm), and the bridge deck is 6mm patterned steel plate. The skirting board is C22 channel steel, and the guardrail is C10 channel steel and φ48×3.2mm round steel pipe.

[0076] First, assemble the military beam into a length of 20m and place it on the No. 0 abutment and the No. 1 pier. Weld the reaction frame on the No. 0 abutment and the guide frame on the No. 1 pier. Install the flat roller on the reaction frame and the No. 1 and No. 2 piers. Then use two 32 steel wire ropes to pull the upper and lower parts of the nose bridge of the military beam end. Assemble the standard section military beam behind the No. 0 abutment and push it to the other side of the river by a single row of machines. During the pushing process, keep the steel wire rope on the other side of the river taut. The reaction frame uses the weight of the abutment itself as the counterweight. The weight of the abutment is: 26 .8t, the maximum cantilever length is 40m, and the moment generated at the fulcrum of the No. 1 bridge pier is: 4.55KN×10 (sections)×20m=910KNm; the moment generated by the abutment counterweight at the fulcrum of the No. 1 bridge pier is: 4.55KN×3 (sections)×6m+268KN×12m=3297.9KNm; therefore, the moment generated by the abutment counterweight at the fulcrum of the No. 1 bridge pier is greater than the moment generated by the military beam at the fulcrum of the No. 1 bridge pier, and the theoretical calculation can meet the anti-overturning requirements of the cantilever end of the military beam. In the process of pushing the military beam, in order to prevent the cantilever end from deflecting too much, it is necessary to pull the cantilever end military beam synchronously with the traction device on the opposite bank of the river. The gate-shaped guide frame on the No. 1 bridge pier is welded and fixed on the top steel plate of the bridge pier with two φ400×12mm spiral steel pipe columns, and then the cross beam is welded on the steel pipe column with 20 I-beam and the cable saddle is installed on the cross beam. Two 5t hand winches are hung on the crossbeam of the guide frame, and double rows of steel pipe columns, crossbeams and cable saddles are installed on the crossbeam of the No. 2 bridge pier (opposite bank) column, and diagonal braces and parallel joints are set between the steel pipe columns. When the splicing length of the military beam reaches 46m, the rope set at the end of the 64th military beam is passed through the cable saddle on the top of the steel pipe column and fixed to the No. 3 bridge abutment. During the subsequent splicing and movement of the military beam, the military beam is pulled by retracting the wire rope at the No. 2 bridge pier position through the hand winch.

[0077] Specific process: flat rollers are set on the cross beams of the No. 0 bridge abutment and the No. 1 bridge pier, and a reaction frame of the military beam is set on the No. 0 bridge abutment. According to the splicing requirements of the 64 military beam, the military beam is spliced ​​on the right bank, one end of the Bailey beam is placed on the horizontal beam flat roller, and the other end is placed on the No. 0 bridge abutment flat roller, and a nose bridge is set at the end of the Bailey beam. After each 4.0m segment is spliced, the spliced ​​64 military beam is pushed 4.0m toward the left bank with the assistance of machinery and hand winches; after the splicing length of the 64 military beam reaches 46m, the rope set at the end of the 64 military beam is passed through the saddle at the top of the steel pipe column I and fixed on the No. 3 bridge abutment. During the subsequent splicing and movement of the military beam, the steel wire rope was retracted at the No. 3 abutment to pull the military beam, and a mechanical jack was used to push the military beam forward at the No. 0 abutment. A hand-operated hoist was used to fine-tune the forward displacement of the military beam on the gate-shaped guide frame of the No. 1 pier. Under the combined action of the steel wire rope traction at the No. 3 abutment on the opposite bank and the jack-pushing machinery at the No. 0 abutment, the 64 military beam was pushed 4.0m toward the left bank as a whole, and then one section of the military beam was assembled at the No. 0 abutment. Repeat the splicing and movement of 64 military beams to complete the splicing of the remaining 6.0m military beams, and place the front end of the military beam on the No. 3 abutment; when the six rows of military beams are installed in place, considering the dynamic load of the vehicle, use U-shaped slots to weld them on the embedded steel plates to fix them in the transverse direction of the bridge, but not fixed in the longitudinal direction of the bridge; remove the steel pipe column I and the parallel diagonal brace and other structures, move the two groups of spliced ​​68m military Bailey beams to the designed positions on both sides of the abutment, and take fixing measures between the connection positions of the military beams, the abutments and the cross beams. After the bridge deck construction is completed, the back wall of the No. 0 abutment is finally constructed.

[0078] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A large-span steel trestle construction device in deep canyon areas, characterized by: The invention comprises a No. 1 bridge pier (2) arranged on both sides of a river valley, a No. 0 bridge abutment (1) being arranged outside the No. 1 bridge pier (2), a reaction frame (5) being arranged on the No. 0 bridge abutment (1), a No. 3 bridge abutment (4) being arranged outside the No. 2 bridge pier (3), an L-shaped support seat (8) being arranged on the No. 3 bridge abutment (4), the No. 1 bridge pier (2) and the No. 2 bridge pier (3) being connected to a guide frame (6) and a traction frame (7) respectively through steel pipe piles (16), and the traction frame (7) tractions a military beam (18) from the No. 0 bridge abutment (1) to the L-shaped support seat (8) through a cable (17); The bottoms of the reaction frame (5), the guide frame (6) and the traction frame (7) are respectively provided with detachable flat rollers (9), and the military beam (18) is slidably mounted on the flat rollers (9); A nose bridge (13) is provided at the end of the military beam (18), a mounting point (14) is provided on a side close to the nose bridge (13), the nose bridge (13) and the mounting point (14) are respectively connected to a cable (17), a saddle (12) is provided on the top of the traction frame (7), a first guide wheel (10) is provided on the upper part of the first guide wheel (10), a second guide wheel (11) is provided on the upper part of the L-shaped support seat (8), and the cable (17) is respectively wound around the saddle (12), the first guide wheel (10) and the second guide wheel (11); A saddle (12) is provided on the top of the guide frame (6); a detachable and symmetrically arranged upright holding device (19) is provided on the upper part of the military beam (18); a first pulley (1904) is provided on the upper part of the upright holding device (19); a balancing positioning device (20) is provided on the outer side of the middle part of the two upright holding devices (19); a second pulley (2014) is provided on the upper part of the balancing positioning device (20); one side of the cable (17) is respectively wound around the second pulley (2014) and the first pulley (1904); and the other side of the cable (17) is connected to the saddle (12).

2. The large-span steel trestle construction device for deep canyon areas according to claim 1 is characterized by: The top of the military beam (18) includes two upper chords (1801) arranged in parallel, the two upper chords (1801) are connected via a transverse connecting plate (1802), a detachable balancing positioning device (20) is provided on the upper chord (1801), a convex plate (1804) is symmetrically provided on the upper side of the transverse connecting plate (1802), a vertical connecting plate (1803) is provided at the lower part of the upper chord (1801), a positive position holding device (19) is connected to the transverse connecting plate (1802), and the balancing positioning device (20) is connected to the upper chord (1801); The positive position holding device (19) comprises a clamping seat (1901), the clamping seat (1901) is provided with a first through slot (1902), the first through slot (1902) and the transverse contact plate (1802) are clamped together, a first baffle (1905) is parallelly provided on the upper part of the clamping seat (1901), a fixing seat (1903) is provided between the two first baffles (1905), a first pulley (1904) is provided on the fixing seat (1903), a first screw rod (1906) is provided outside the first baffle (1905), an insert block (1907) is provided outside the first screw rod (1906), a first slot (1908) and a second screw rod (1909) are respectively provided on both sides of the insert block (1907), the first slot (1908) and the convex plate (1804) are plugged together, and the second screw rod (1909) and the first screw rod (1906) are connected via a positive and negative thread sleeve (1910); The balancing positioning device (20) comprises a bonding plate (2001), a top plate (2002) is provided on the upper part of the bonding plate (2001), a first side plate (2003) is provided at the end of the top plate (2002), a second pulley (2014) is rotatably arranged on the mounting plate (2013), the mounting plate (2013) and the top plate (2002) are connected, the bonding plate (2001), the top plate (2002) and the first side plate (2003) form a limiting area (2004), The chord rod (1801) is inserted into the limiting area (2004), a first avoidance opening (211) is provided in the middle of the first side plate (2003), a first threaded hole (2006) and a first through hole (2005) are provided on both sides of the first avoidance opening (211), a locking rod (2008) is connected to the inner thread of the first through hole (2005), a guide rod (2007) is inserted into the first threaded hole (2006), and a movable locking rod (2008) is connected to the end of the guide rod (2007) through a thread. The movable seat (2018) is provided with a second through slot (2019), the second through slot (2019) is clamped on the transverse contact plate (1802), the upper part of the movable seat (2018) is provided with a second side plate (2021), the second side plate (2021) is provided with a second avoidance opening (2022), the movable seat (2018) is provided with a second card slot (2020), the second card slot (2020) and the upper chord rod (1801) are plugged and fit together. An ear plate (2023) is provided on the outside of the plate (2001), a round rod (2026) is inserted into the ear plate (2023), a bottom plate (2025) is provided at the bottom of the round rod (2026), a spring (2027) is sleeved on the round rod (2026), the bottom plate (2025) abuts against the bottom of the upper chord rod (1801), a third avoidance opening (2030) is provided on the bottom plate (2025), and the vertical contact plate (1803) is located in the third avoidance opening (2030).

3. The large-span steel trestle construction device for deep canyon areas according to claim 2 is characterized by: The top plate (2002) is provided with a plurality of second threaded holes (2012), the mounting plate (2013) is provided with a plurality of second through holes (2017), the locking pin (2016) is threadedly connected to the second threaded hole (2012), the second pulley (2014) is sleeved on the fixed shaft (2015), the fixed shaft (2015) and the mounting plate (2013) are fixedly connected, the locking rod (2008) is provided with a round table (2009) and a connecting table (2010) on both sides, and the ear plate (2016) is threadedly connected to the second threaded hole (2012), the second pulley (2014) is sleeved on the fixed shaft (2015), the fixed shaft (2015) and the mounting plate (2013) are fixedly connected, and the locking rod (2008) is provided with a round table (2009) and a connecting table (2010) on both sides. A third through hole (2024) is provided on the bottom plate (2023), a round rod (2026) is inserted into the third through hole (2024), locking holes (2029) are respectively provided on both sides of the third through hole (2024), locking rods (2028) are respectively provided on both sides of the round rod (2026), the locking rods (2028) are inserted into the locking holes (2029), and a transfer plate (21) is detachably provided at the bottom of the bottom plate (25), and a pull rod (22) is inserted into the transfer plate (21); The first baffle plate (1905) is provided with a first through hole (1911), the first through hole (1911) is connected to a lap plate (1913) via a screw assembly (1912), the head of the lap plate (1913) is always in contact with the guide frame (6), the lap plate (1913) includes symmetrically arranged support feet (1914), the support feet (1914) are provided with a second through hole (1915), and the two support feet (1914) are connected to the support plate ( 1916), baffles (1917) are respectively provided on both sides of the support plate (1916), a side of the support plate (1916) away from the support foot (1914) is provided with an avoidance groove (1918), a force-bearing plate (1919) is provided at the lower part of the support foot (1914), the force-bearing plate (1919) is against the outer side of the clamping seat (1901), and a rounded corner area (1920) is provided at one end of the baffle plate (1917) close to the support foot (1914).

4. The construction method of a large-span steel trestle construction device in a deep canyon area according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, casting bridge pier No. 1 (2) and bridge pier No. 2 (3) on both sides of the river valley, and casting bridge abutment No. 0 (1) and bridge abutment No. 3 (4) on both sides; S2. After the curing strength is reached, the reaction frame (5), the guide frame (6), the traction frame (7), the L-shaped support seat (8) and the steel pipe pile (16) are installed in sequence; S3, installing a flat roller (9) on the reaction frame (5), the guide frame (6) and the traction frame (7) respectively; S4, installing a military beam (18) on one side of the zero bridge abutment (1), placing one side of the military beam (18) on a flat roller (9), and installing a nose bridge (13) on the other side of the military beam (18); S5, fix the nose bridge (13) and the mounting point (14) by means of a cable (17), and then push the military beam (18) until it reaches the designed position and then stop; S6, adjusting the position of the cable (17), winding the cable (17) around the saddle (12) on the top of the traction frame (7), and winding the cable (17) around the first guide wheel (10) and the second guide wheel (11) in sequence. After the preparation is completed, continue to advance the military beam (18); S7, after the two sides of the military beam (18) are respectively placed on the L-shaped support seat (8) and the bridge abutment No. 0 (1), the military beam (18) is fixed; S8. The reaction frame (5), the guide frame (6) and the traction frame (7) are disassembled in sequence, and the surface of the military beam (18) is paved.

5. The construction method of a large-span steel trestle construction device in a deep canyon area according to claim 4 is characterized by: S1 includes the site selection of the trestle. During the site selection process, the coordinates of each sampling point are obtained through a total station, and then determined after multi-factor analysis and then laid out for construction.

6. The construction method of a large-span steel trestle construction device in a deep canyon area according to claim 4 is characterized by: When a single section of the military beam (18) is pushed into place, S4-S7 is repeated until all the military beams (18) are pushed in. During the pushing process, it is necessary to ensure that the cable (17) is in a taut state and the recommended direction of the military beam (18) is accurate.

7. The construction method of a large-span steel trestle construction device in a deep canyon area according to claim 4 is characterized by: Before pouring the bridge abutment No. 0 (1) in S1, it is necessary to backfill the backfill soil residue (15) to form a bottom foundation.

Images