Fabricated steel structure system on lower portion of bailey beam of steel trestle and construction technology of fabricated steel structure system

Abstract

The invention relates to the field of building engineering construction, and discloses a steel trestle bailey beam lower portion assembly type steel structure system and a construction technology thereof, and the steel trestle bailey beam lower portion assembly type steel structure system comprises steel pipe piles, steel structure rod pieces and pile cap plate components. The steel pipe piles can reach the required length in a simple butt joint mode, the steel pipe piles are connected through rapidly-assembled steel structure rod pieces, the pile tops of the steel pipe piles are connected with the upper cross beam through rapidly-assembled pile cap plate components, and all the components can be rapidly installed and disassembled in the whole process without welding and cutting. And the recycling frequency is high, and no material is wasted.

Description

Technical Field

[0001] The invention relates to the field of building engineering construction, and in particular to the rapid assembly and disassembly construction of a steel trestle. The steel structure system and construction process completely solve the assembly process of the entire steel trestle construction. The entire construction process does not require cutting, processing and welding of materials, which greatly improves the work efficiency of the steel trestle construction. Background Art

[0002] Steel trestles are widely used in engineering construction. Only some of the current steel trestles have been assembled. The beams and the steel structures below still need to be welded and cut. Some new technologies have solved some of the problems, but they are still not comprehensive enough to turn the entire construction process into assembly. There are still some major problems:

[0003] 1. The length of steel pipe piles is either too long to be convenient for transportation, or too short to be extended. The traditional extension method is welding, and cutting during multiple turnover uses will cause a lot of material waste.

[0004] 2. Almost every time a new steel trestle is built, the tops of all piles must be cut and U-shaped grooves must be cut out.

[0005] 3. The crossbeam is placed in the U-shaped groove at the top of the pile. The crossbeam is welded to the steel pipe pile, and in most cases, a supporting corbel needs to be welded at the bottom of the U-shaped groove to increase the stress surface of the steel pipe pile. Alternatively, some new technologies require the installation of flange-like components on the top of the pile, and the crossbeam and flange are installed with special fasteners and bolts. The problem is that the flange on the top of the pile needs to be welded on. Prior welding on the top of the pile will make it impossible to use the conventional driving construction process. The defect is that the outer edge of the flange exceeds the outer wall of the steel pipe pile by at least 80mm. When driving the steel pipe pile, the pile cap of the hammering equipment or the clamp of the vibrating hammer cannot match.

[0006] 4. The connecting beam is usually cut according to the pile spacing first, and then the two ends are welded to the steel pipe piles, or holes are cut at both ends of the connecting beam, and the connecting plates are welded on the steel pipe piles, and then connected with bolts. Some scissors struts can be welded on the platform in advance, and then welded or bolted to the steel pipe piles at both ends after the overall lifting. To ensure that the connecting parts at both ends are in the same straight line with the connecting beam, the connecting parts are still welded to the steel pipe piles after the steel pipe piles are inserted. This type of operation is still time-consuming and labor-intensive, with low work efficiency. All connecting beams must be cut again or welded and lengthened for secondary use, resulting in a large waste of materials.

[0007] 5. A partially improved process is to sleeve the middle connecting part of the connecting beam. The sleeve connection method is to cut closely spaced through holes along the axis on a rod, and use pins to insert into different holes to adapt to the changes in spacing. However, the spacing of the holes still cannot 100% meet the requirements of disordered changes in spacing.

[0008] In view of the above problems, it is necessary to invent a steel trestle Bailey beam lower part assembled steel structure system and its construction process. Summary of the invention

[0009] Purpose of the Invention

[0010] The present invention aims to provide a steel trestle Bailey beam lower assembled steel structure system and its construction process, which are specially used for the rapid installation and disassembly of steel trestles in the field of construction engineering. At the same time, the secondary use still does not require prior processing of the materials. By changing the traditional practices, the work efficiency is improved, the workers' high-altitude or water working time is reduced, and the safety risks are reduced, so as to achieve the purpose of reducing costs and increasing efficiency.

[0011] Technical Solution

[0012] To achieve the above object, the present invention adopts the following technical solutions:

[0013] The present invention discloses an assembled steel structure system for the lower part of Bailey beams of a steel trestle, comprising a plurality of steel pipe piles, a plurality of horizontal steel structure rods, a plurality of oblique steel structure rods, a plurality of pile cap plate components and a cross beam; the steel pipe piles can be extended by a simple docking method; the horizontal steel structure rods are used for assembled connections between steel pipe piles in the horizontal direction; the oblique steel structure rods are used for assembled connections between steel pipe piles at different elevations; the pile cap plate components are used for assembled connections between steel pipe piles and cross beams, and all the above-mentioned components can be assembled and disassembled to form an assembled steel structure system.

[0014] The construction process of the Bailey beam lower part assembled steel structure system of a steel trestle described in the present invention comprises the following steps:

[0015] S1. The steel pipe piles are processed in the steel pipe pile processing plant according to the requirements of steel trestle steel pipe piles with greater universality. The length of the steel pipe piles should be convenient for transportation by conventional vehicles. The steel pipe piles are further processed into a structural form suitable for rapid assembly requirements, and other components are also processed into a structural form suitable for rapid assembly requirements;

[0016] S2: Transport all materials to the construction site and connect the steel pipe piles to the required length;

[0017] S3: Use conventional piling technology to insert the steel pipe pile to the designed elevation, and ensure that the pile position coordinates and pile top elevation are within the allowable deviation range. It should also be ensured that the direction of the U-shaped double-ear plate connection seat on the pile body corresponds to the direction of the other steel pipe pile to be connected, and ensure that the angle and deviation are not too large;

[0018] S4: Insert other steel pipe piles in the current span of the steel trestle according to the same requirements;

[0019] S5: Install and fix the hanging basket between two piles to facilitate workers to install components;

[0020] S6: Install the cylindrical cross shaft body on the U-shaped double-ear plate connection seat of all steel pipe piles, insert the bolt 2 through the ear plate on one side of the U-shaped double-ear plate connection seat into the cross-shaped hole structure, and pass through the ear plate on the other side of the U-shaped double-ear plate connection seat, screw on the nut and tighten it, hoist the long threaded steel pipe inter-fitting component with double-ear plate to the side of the U-shaped double-ear plate connection seat, align the double-ear plate 1 of the long threaded steel pipe inter-fitting component with double-ear plate with the other two holes of the cross-shaped hole structure of the cylindrical cross shaft body, and screw two bolts 3 into the holes respectively and lock them; S7: Use a crane to install another cylindrical cross shaft body on the U-shaped double-ear plate connection seat on another steel pipe pile, hoist the short threaded steel pipe component with double-ear plate to the side of the U-shaped double-ear plate connection seat of another steel pipe pile, align the double-ear plate 2 of the short threaded steel pipe component with double-ear plate with the other two holes of the cross-shaped hole structure of the cylindrical cross shaft body, and screw two bolts 3 into the holes respectively and lock them;

[0021] S8: Use a hand chain hoist and a crane to align the two ends of the horizontal steel structure rod, unscrew the long internal thread steel pipe and connect it with the short external thread steel pipe, and screw it in enough length to ensure that the tension force meets the requirements;

[0022] S9: The remaining oblique steel structure members and horizontal steel structure members are connected in the same way;

[0023] S10: Use a crane to place the pile cap plate components on the top of all steel pipe piles, ensure that the limiter is stuck in the inner wall of the steel pipe pile, adjust the angle of the pile cap plate components, ensure that the upper crossbeam can be installed smoothly, hook all the bolts into the long strip cutouts at the top of the steel pipe pile, and tighten the nuts to ensure that the tightening degree meets the requirements;

[0024] S11: Use a crane to hoist the beam to the position of the center point line of all the steel pipe piles in this span. Use a pressure plate and bolts to fix the beam and steel plate together for each pile to ensure that the tightening degree meets the requirements;

[0025] S12: Construction of upper steel structure of beam;

[0026] S13: Continue the steel pipe pile driving construction of the next span of the steel trestle and the installation of other components until the entire steel trestle is completed;

[0027] S14: The same equipment is used for dismantling the steel trestle, and the construction process is the reverse process mentioned above.

[0028] Preferably, the steel pipe pile can be extended to the required length by a simple docking method, the top of the steel pipe pile is provided with a reinforcing hoop, the lower part of the pile top is provided with a plurality of long strip-shaped cutouts, the pile tip is provided with a reinforcing hoop, a plurality of round holes are provided around the pile tip, nuts are welded in the round holes, the top of the lower section pile is provided with a reinforcing hoop, a plurality of round holes are provided around the lower part of the pile top, nuts are welded in the round holes, the pile tip of the upper section pile and the pile top of the lower section pile can be connected by a plurality of docking plates and a plurality of bolts, and the pile body of the steel pipe pile can be provided with a plurality of butt joints at different positions and at different angles. The steel pipe pile is only a description form, and piles, pile foundations, load-bearing columns, columns or steel columns of other structural forms are also applicable to the structural system, and their materials, shapes and sizes are determined according to actual needs. The reinforcement hoop 1, reinforcement hoop 2 and reinforcement hoop 3 of the steel pipe pile can be welded on the outer wall of the steel pipe pile, and can also be welded on the inner wall of the steel pipe pile.

[0029] Preferably, the U-shaped double-ear plate connecting seat is connected to the steel pipe pile by welding, and can be pre-welded to the pile body before the steel pipe pile is driven; if the U-shaped double-ear plate connecting seat is connected by a hoop or bolt, it can be installed when the horizontal steel structure rod and the oblique steel structure rod are installed after the steel pipe pile is driven, and connected by a hoop or by a connecting bolt fixed on the pile body.

[0030] Preferably, the horizontal steel structure rod includes two U-shaped double-ear plate connecting seats, two cylindrical cross-axis bodies, two bolts two, four bolts three, a long threaded steel pipe interlocking component with double ear plates and a short threaded steel pipe component with double ear plates. The structure of the oblique steel structure rod is the same as that of the horizontal steel structure rod, except that the length of the intermediate component of the two is different.

[0031] Preferably, the pile cap plate component includes a steel plate, several bolts four, a pressure plate, several bolts five and several limit members; the steel plate is provided with several long strip cuts two and several arc-shaped cuts, several bolts four pass through the long strip cuts two of the steel plate, and cooperate with the pressure plate placed on the upper part of the beam to fix the beam and the steel plate together, several bolts five pass through the arc-shaped cuts and hook on the upper part of the long strip cuts one of the lower steel pipe pile to fix the steel pipe pile and the steel plate together.

[0032] Preferably, the cylindrical cross shaft body has a cross-shaped hole structure, and the cross-shaped hole structure can be a through hole or a blind hole. It can be used in conjunction with a bolt two and two bolts three to form a simple high-strength cross shaft, which can be used to connect with the U-shaped double-ear plate connecting seat and double-ear plate one to form a cross universal joint, which can solve the angle and height deviation problems between the horizontal steel structure rods and the oblique steel structure rods and the U-shaped double-ear plate connecting seats at both ends.

[0033] Preferably, the long threaded steel pipe interlocking component with double ear plates includes a double ear plate 1, a long externally threaded steel pipe and a long internally threaded steel pipe. The long externally threaded steel pipe and the double ear plate 1 are welded together through a transition steel plate in the middle, and the long internally threaded steel pipe and the long externally threaded steel pipe are interlocked together through threads. When in use, the long internally threaded steel pipe is screwed out and then screwed into the short externally threaded steel pipe to connect them into a whole.

[0034] Preferably, the short threaded steel pipe component with double ear plates includes a short externally threaded steel pipe, a steel rod and a second double ear plate. The short externally threaded steel pipe and the steel rod are welded together through an intermediate transition steel plate, and the steel rod and the second double ear plate are welded together through an intermediate transition steel plate. The material, diameter, wall thickness and length of the long externally threaded steel pipe and the long internally threaded steel pipe are determined according to actual needs; the steel rod can be a rod-shaped object such as a steel pipe, an I-beam, an H-shaped steel, a channel steel, or a rod-shaped object with other cross-sectional forms.

[0035] Preferably, the length of the long threaded steel pipe inter-sheathed component with double-ear plates is set according to the use requirements, and the length range can be 0 to 1200 mm to match the requirements for changes in the spacing between steel pipe piles.

[0036] Preferably, the number, position and external dimensions of the two long strip cuts and the arc-shaped cuts are determined according to the size of the steel plate, and the size of the steel plate is determined according to the diameter of the lower steel pipe pile; the four bolts and the five bolts are only one way of describing the fasteners, and their appearance is not limited. In particular, the bottom of the five bolts has a hook; the pressure plate is a long strip of steel plate with two waist holes, which can also be round holes; the limiter is fixed on the steel plate, and can be a steel plate, a steel bar, a steel section, an angle steel, or other materials with other cross-sectional forms. Its function is to be stuck in the inner wall of the steel pipe pile to prevent the steel plate from sliding on the top of the steel pipe pile.

[0037] Core innovation

[0038] -The steel structure system can replace traditional welding or bolt connections.

[0039] - The steel structure system is reusable and does not require any processing for secondary use.

[0040] - The steel structure system is easy to transport and can be transported by conventional vehicles.

[0041] -The steel structure system can be constructed in a standardized manner and can be quickly implemented in combination with the standardized steel trestle design and selection.

[0042] Beneficial Effects

[0043] 1. The steel structure system of the present invention can realize rapid installation and disassembly in the whole process, which can improve the work efficiency of this link by not less than 50%, and can save the construction cost of the steel trestle by not less than 30%.

[0044] 2. The steel structure system of the present invention can replace traditional welding or bolt connection, shorten the installation and disassembly time and reduce the potential risks of workers.

[0045] 3. The steel structure system of the present invention can be reused and does not require processing for secondary use, which can reduce material loss and lower the cost of use.

[0046] 4. The steel structure system of the present invention is convenient for classified storage and maintenance, and does not require complicated maintenance services. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a general schematic diagram of the steel structure system of the present invention;

[0048] Figure 2 It is a schematic diagram of a steel pipe pile of the present invention;

[0049] Figure 3 This is a schematic diagram of the steel pipe pile docking of the present invention;

[0050] Figure 4 It is a schematic diagram of a steel structure rod of the present invention;

[0051] Figure 5 This is a schematic diagram of a U-shaped double-ear plate connecting seat of the present invention;

[0052] Figure 6 It is a schematic diagram of the cylindrical cross shaft body of the present invention;

[0053] Figure 7 Schematic diagram of the sleeved component of the long-threaded inner and outer steel pipes with double ear plates of the present invention

[0054] Figure 8 It is a schematic diagram of a short threaded steel pipe component with double ear plates of the present invention;

[0055] Fig. 9 A lateral schematic diagram of a pile cap plate member of the present invention

[0056] Fig.10 It is a front schematic diagram of a pile cap plate member of the present invention;

[0057] Fig.11 A schematic diagram of a steel plate of a pile cap plate member of the present invention;

[0058] Fig.12 It is a schematic diagram of a pressing plate of a pile cap plate member of the present invention;

[0059] Legend:

[0060] 1. Steel pipe pile; 2. Horizontal steel structure rod; 3. Oblique steel structure rod; 4. Pile cap plate member; 5. Crossbeam; 6. Bailey beam; 7. Distribution beam; 8. Bridge deck; 9. Guardrail; 101. Reinforcement hoop 1; 102. Reinforcement hoop 2; 103. Reinforcement hoop 3; 104. Butt plate; 105. Long strip cutout 1; 106. Round hole; 107. Nut; 108. Bolt 1; 201. U-shaped double-ear plate connector; 202. Cylindrical cross shaft body; 2021. Cross-shaped hole structure; 203. Bolt 2; 204, bolt three; 205, long threaded steel pipe interlocking component with double-ear plate; 2051, double-ear plate one; 2052, long external threaded steel pipe; 2053, long internal threaded steel pipe; 206, short threaded steel pipe component with double-ear plate; 2061, short external threaded steel pipe; 2062, steel rod; 2063, double-ear plate two; 401, steel plate; 402, bolt four; 403, pressure plate; 404, bolt five; 405, limiter; 406, long strip incision two; 407, arc incision; 408, waist hole; DETAILED DESCRIPTION

[0061] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by relevant personnel in this field without creative work are within the scope of protection of the present invention.

[0062] The present invention provides a technical solution, a steel trestle Bailey beam lower part assembled steel structure system and its construction process, combined with Figures 1 to 12 The specific instructions are as follows:

[0063] The steel pipe pile (1) is manufactured in a steel pipe pile factory. A reinforcing hoop (101) is welded on the pile top of the steel pipe pile (1). A plurality of long strip cuts (105) are cut around the lower part of the pile top. A reinforcing hoop (102) is welded on the pile tip. A plurality of round holes (106) are cut around the pile tip. Nuts (107) are welded in the round holes. A reinforcing hoop (103) is welded on the pile top of the lower section pile. A plurality of round holes (106) are cut around the lower part of the pile top. Nuts (107) are welded in the round holes. The pile tip of the upper section pile and the pile top of the lower section pile are butt-jointed to a required length through a plurality of butt-jointing plates (104) and a plurality of bolts (108). A required number of U-shaped double-ear plate connecting seats (201) are welded on the pile body of the steel pipe pile (1).

[0064] The horizontal steel structure rod (2) includes two U-shaped double-ear plate connection seats (201), two cylindrical cross shaft bodies (202), two bolts 2 (203), four bolts 3 (204), a long threaded steel pipe with double-ear plate interlocking member (205) and a short threaded steel pipe with double-ear plate member (206). The structure of the oblique steel structure rod (3) is the same as that of the horizontal steel structure rod (2), except that the lengths of the intermediate member (205) and the member (206) of the two are different. The connection with the steel pipe pile (1) is as follows: Figure 1 shown.

[0065] The pile cap plate component (4) includes a steel plate (401), several bolts (402), a pressure plate (403), several bolts (404) and several limiters (405). Several long strip cuts (406) and several arc cuts (407) are cut on the steel plate (401). Several bolts (402) pass through the long strip cuts (406) of the steel plate (401) and cooperate with the pressure plate (403) placed on the upper part of the beam (5) to fix the beam (5) and the steel plate (401) together. Several bolts (404) pass through the arc cuts (407) and hook on the upper part of the long strip cuts (105) of the lower steel pipe pile (1) to fix the steel pipe pile (1) and the steel plate (401) together. Fig. 9 , Fig.10 shown.

[0066] The construction process is as follows:

[0067] S1. Processed steel pipe piles (1), the length of the steel pipe piles (1) is preferably convenient for conventional vehicle transportation size, further processing the steel pipe piles (1) into a structure suitable for rapid assembly requirements, the other components are also processed into a structure suitable for rapid assembly requirements;

[0068] S2: transport all materials to the construction site and connect the steel pipe piles (1) to the required length;

[0069] S3: Use conventional piling technology to insert the steel pipe pile (1) to the designed elevation, while ensuring that the pile position coordinates and the pile top elevation are within the allowable deviation range, and also ensure that the direction of the U-shaped double-ear plate connecting seat (201) on the pile body corresponds to the direction of another steel pipe pile (1) to be connected, and ensure that the angle and deviation are not too large;

[0070] S4: insert other steel pipe piles (1) of the current span of the steel trestle according to the same requirements;

[0071] S5: Install and fix the hanging basket between two piles to facilitate workers to install components;

[0072] S6: Install the cylindrical cross shaft body (202) on the U-shaped double-ear plate connection seat (201) of all steel pipe piles (1), insert the bolt 2 (203) through the ear plate on one side of the U-shaped double-ear plate connection seat (201) into the cross-shaped hole structure (2021), and pass through the ear plate on the other side of the U-shaped double-ear plate connection seat (201), screw on the nut and tighten it, hang the long threaded steel pipe interlocking component (205) with double-ear plate to the side of the U-shaped double-ear plate connection seat (201), align the double-ear plate 1 (2051) of the long threaded steel pipe interlocking component (205) with double-ear plate with the other two holes of the cross-shaped hole structure (2021) of the cylindrical cross shaft body (202), and screw two bolts 3 (204) into the holes respectively and lock them;

[0073] S7: Use a crane to install another cylindrical cross shaft body (202) on the U-shaped double-ear plate connection seat (201) on another steel pipe pile (1), lift the short-threaded steel pipe member (206) with double-ear plate to the side of the U-shaped double-ear plate connection seat (201) of another steel pipe pile (1), align the double-ear plate 2 (2063) of the short-threaded steel pipe member (206) with the other two holes of the cross-shaped hole structure (221) of the cylindrical cross shaft body (202), and screw two bolts 3 (204) into the holes respectively and tighten them;

[0074] S8: Use a hand chain hoist and a crane to align the two ends of the horizontal steel structure rod (2), unscrew the long internal thread steel pipe (2053) and connect it to the short external thread steel pipe (2061), and screw it in to a sufficient length to ensure that the tension force meets the requirements;

[0075] S9: The remaining oblique steel structure members (3) and the horizontal steel structure members (2) are connected in the same way;

[0076] S10: Use a crane to place the pile cap plate component (4) into the top of all the steel pipe piles (1), ensure that the stopper (405) is stuck into the inner wall of the steel pipe pile (1), adjust the angle of the pile cap plate component (4), ensure that the upper crossbeam (5) can be installed smoothly, hook all the bolts (404) into the long strip cutouts (105) at the top of the steel pipe pile (1), and tighten the nuts to ensure that the tightening degree meets the requirements;

[0077] S11: Use a crane to hoist the cross beam (5) to the position of the center point connection line of all the steel pipe piles (1) in this span, and use a pressure plate (403) and bolts (402) to fix the cross beam (5) and the steel plate (401) together for each pile, ensuring that the tightening degree meets the requirements;

[0078] S12: Construction of upper steel structure of beam (5);

[0079] S13: Continue driving the steel pipe piles (1) of the next span of the steel trestle and installing other components until the entire steel trestle is completed;

[0080] S14: The same equipment is used for dismantling the steel trestle, and the construction process is the reverse process mentioned above.

[0081] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steel trestle Bailey beam lower part assembled steel structure system and its construction process, comprising a plurality of steel pipe piles (1), a plurality of horizontal steel structure rods (2), a plurality of oblique steel structure rods (3), a plurality of pile cap plate components (4), and a cross beam (5), characterized in that: The steel pipe piles (1) can be extended by a simple docking method; the horizontal steel structure rods (2) are used for the assembled connection between the steel pipe piles (1) in the horizontal direction; the oblique steel structure rods (3) are used for the assembled connection between the steel pipe piles (1) at different elevations; and the pile cap plate member (4) is used for the assembled connection between the steel pipe piles (1) and the crossbeam (5).

2. The Bailey beam lower part assembled steel structure system of a steel trestle according to claim 1 is characterized by: The steel pipe pile (1) has a relatively novel structure, and its pile body can be extended to a desired length by a simple docking method. The pile top of the steel pipe pile (1) is provided with a reinforcing hoop (101), a plurality of long strip cutouts (105) are arranged around the lower part of the pile top, a reinforcing hoop (102) is provided at the pile tip, a plurality of round holes (106) are arranged around the pile tip, nuts (107) are welded in the round holes, a reinforcing hoop (103) is provided at the pile top of the lower section pile, and a plurality of round holes (106) are arranged around the pile tip. Nuts (107) are welded in the round holes, and a reinforcing hoop (103) is provided at the pile top of the lower section pile. A plurality of circular holes (106) are arranged around the steel pipe pile (1), and nuts (107) are welded in the circular holes. The pile tip of the upper pile and the pile top of the lower pile can be connected by a plurality of docking plates (104) and a plurality of bolts (108). A plurality of U-shaped double-ear plate connecting seats (201) are fixed at different positions and angles on the pile body of the steel pipe pile (1). The U-shaped double-ear plate connecting seats (201) can be fixed by welding, by connecting through a hoop on the pile body, or by connecting through bolts.

3. The Bailey beam lower part assembled steel structure system of a steel trestle according to claim 2 is characterized by: The U-shaped double-ear plate connection seat (201) is connected to the steel pipe pile (1) by welding, and can be pre-welded to the pile body before the steel pipe pile (1) is driven; if the U-shaped double-ear plate connection seat (201) is connected by a clamp or bolt, it can be installed when the horizontal steel structure rod (2) and the oblique steel structure rod (3) are installed after the steel pipe pile (1) is driven, and connected by a clamp or by bolts of a connection piece fixed on the pile body.

4. The Bailey beam lower part assembled steel structure system of a steel trestle according to claim 1 is characterized by: The horizontal steel structure rod (2) comprises two U-shaped double-ear plate connecting seats (201), two cylindrical cross-axis bodies (202), two bolts (203), four bolts (204), a long threaded steel pipe interlocking component with double-ear plates (205) and a short threaded steel pipe component with double-ear plates (206). The structure of the oblique steel structure rod (3) is the same as that of the horizontal steel structure rod (2), except that the lengths of the intermediate component (205) and the component (206) of the two are different.

5. The Bailey beam lower part assembled steel structure system of a steel trestle according to claim 1 is characterized by: The pile cap plate component (4) comprises a steel plate (401), a plurality of bolts (402), a pressure plate (403), a plurality of bolts (404) and a plurality of stoppers (405).

6. The Bailey beam lower part assembled steel structure system of a steel trestle according to claim 5, characterized in that: The steel plate (401) has several long strip cutouts (406) and several arc cutouts (407). Several bolts (402) pass through the long strip cutouts (406) of the steel plate (401) and cooperate with a pressure plate (403) placed on the upper part of the crossbeam (5) to fix the crossbeam (5) and the steel plate (401) together. Several bolts (404) pass through the arc cutout (407) and hook on the upper part of the long strip cutout (105) of the lower steel pipe pile (1) to fix the steel pipe pile (1) and the steel plate (401) together.

7. A steel trestle Bailey beam lower part assembled steel structure system according to claims 1 and 2, characterized in that: The steel pipe pile (1) is only a description form. Piles, pile foundations, load-bearing columns, columns or steel columns of other structural forms are also applicable to the structural system. The material, shape and size are determined according to actual needs. The reinforcement hoop 1 (101), reinforcement hoop 2 (102) and reinforcement hoop 3 (103) of the steel pipe pile (1) can be welded on the outer wall of the steel pipe pile (1), and can also be welded on the inner wall of the steel pipe pile (1).

8. A steel trestle Bailey beam lower part assembled steel structure system according to claims 1 and 4, characterized in that: The cylindrical cross shaft body (202) of the assembly of the horizontal steel structure rod (2) and the oblique steel structure rod (3) has a cross-shaped hole structure (2021). The cross-shaped hole structure (2021) can be a through hole or a blind hole. It is used in conjunction with a bolt two (203) and two bolts three (204) to form a simple high-strength cross shaft, which can be used to connect with the U-shaped double-ear plate connecting seat (201) and the double-ear plate one (2051) to form a cross universal shaft. The horizontal steel structure rod ( 2) and the two ends of the oblique steel structure rod (3) adopt this connection form to solve the problem of angle and height deviation. Other similar connection forms using universal shaft structure should also belong to the same type of concept and creativity; the components of the horizontal steel structure rod (2) and the oblique steel structure rod (3) with double-ear plate long threaded steel pipe interlocking component (205) include double-ear plate one (2051), long external threaded steel pipe (2052) and long internal threaded steel pipe (2053), the long external threaded steel pipe (2052) and the double-ear plate one (2051) are connected to each other. 51) are welded together through the intermediate transition steel plate, and the long internally threaded steel pipe (2053) and the long externally threaded steel pipe (2052) are mutually sleeved together through threads. When in use, the long internally threaded steel pipe (2052) is screwed out and used in conjunction with the short externally threaded steel pipe (2061) of the component (206); the assembly of the horizontal steel structure rod (2) and the oblique steel structure rod (3) with a short threaded steel pipe component (206) with double ear plates includes a short externally threaded steel pipe (2061), a steel rod (2062) and a double ear plate (2 063), the short externally threaded steel pipe (2061) and the steel rod (2062) are welded together through the intermediate transition steel plate, the steel rod (2062) and the double ear plate 2 (2063) are welded together through the intermediate transition steel plate, the material, diameter, wall thickness and length of the long externally threaded steel pipe (2052) and the long internally threaded steel pipe (2053) are determined according to actual needs; the steel rod (2062) can be a rod-shaped object such as a steel pipe, an I-beam, an H-shaped steel, a channel steel or a rod-shaped object with other cross-section forms.

9. A steel trestle Bailey beam lower part assembled steel structure system according to claims 1 and 8, characterized in that: The length of the long threaded steel pipe interlocking component (205) with double ear plates is set according to the use requirements, and its length range can be 0 to 1200 mm to match the requirements for the change in the spacing of the steel pipe piles (1).

10. A steel trestle Bailey beam lower part assembled steel structure system according to claims 1 and 5, characterized in that: The number, position and external dimensions of the second long strip cutout (406) and the arc-shaped cutout (407) are determined according to the size of the steel plate (401), and the size of the steel plate (401) is determined according to the diameter of the lower steel pipe pile (1); the fourth bolt (402) and the fifth bolt (404) are only one way of describing the fasteners, and their external shapes are not limited to those shown in the schematic diagram of the present invention. In particular, the bottom of the fifth bolt (404) has a hook; the pressing plate (403) is a long strip steel plate with two waist holes (408), and the waist holes (408) can also be round holes; the limiting member (405) is fixed on the steel plate (401), and can be a steel plate, a steel bar, a steel section, an angle steel, or other materials with other cross-sectional forms, and its function is to be stuck in the inner wall of the steel pipe pile (1) to prevent the steel plate (401) from sliding on the top of the steel pipe pile (1).

11. A construction process for a steel trestle Bailey beam lower part assembled steel structure system, characterized in that: By adopting the steel structure system as described in claims 1 to 10, the entire construction process can complete the rapid installation and disassembly of the part below the Bailey beam of the steel trestle without cutting and welding. The steel trestle constructed according to the same standard can be recycled for many times. In the case of no damage or loss, all materials are not wasted. The specific construction process is as follows: S1. The steel pipe pile (1) is processed in a steel pipe pile processing plant according to the requirements of the steel pipe pile of the steel trestle with greater universality. The length of the steel pipe pile (1) is preferably a size that is convenient for transportation by conventional vehicles. The steel pipe pile (1) is further processed into a structural form suitable for rapid assembly requirements, and other components are also processed into a structural form suitable for rapid assembly requirements; S2: transport all materials to the construction site and connect the steel pipe piles (1) to the required length; S3: Use conventional piling technology to insert the steel pipe pile (1) to the designed elevation, while ensuring that the pile position coordinates and the pile top elevation are within the allowable deviation range, and also ensure that the direction of the U-shaped double-ear plate connecting seat (201) on the pile body corresponds to the direction of another steel pipe pile (1) to be connected, and ensure that the angle and deviation are not too large; S4: insert other steel pipe piles (1) of the current span of the steel trestle according to the same requirements; S5: Install and fix the hanging basket between two piles to facilitate workers to install components; S6: Install the cylindrical cross shaft body (202) on the U-shaped double-ear plate connection seat (201) of all steel pipe piles (1), insert the bolt 2 (203) through the ear plate on one side of the U-shaped double-ear plate connection seat (201) into the cross-shaped hole structure (2021), and pass through the ear plate on the other side of the U-shaped double-ear plate connection seat (201), screw on the nut and tighten it, hang the long threaded steel pipe interlocking component (205) with double-ear plate to the side of the U-shaped double-ear plate connection seat (201), align the double-ear plate 1 (2051) of the long threaded steel pipe interlocking component (205) with double-ear plate with the other two holes of the cross-shaped hole structure (2021) of the cylindrical cross shaft body (202), and screw two bolts 3 (204) into the holes respectively and lock them; S7: Use a crane to install another cylindrical cross shaft body (202) on the U-shaped double-ear plate connection seat (201) on another steel pipe pile (1), lift the short-threaded steel pipe member (206) with double-ear plate to the side of the U-shaped double-ear plate connection seat (201) of another steel pipe pile (1), align the double-ear plate 2 (2063) of the short-threaded steel pipe member (206) with the other two holes of the cross-shaped hole structure (221) of the cylindrical cross shaft body (202), and screw two bolts 3 (204) into the holes respectively and tighten them; S8: Use a hand chain hoist and a crane to align the two ends of the horizontal steel structure rod (2), unscrew the long internal thread steel pipe (2053) and connect it to the short external thread steel pipe (2061), and screw it in to a sufficient length to ensure that the tension force meets the requirements; S9: The remaining oblique steel structure members (3) and the horizontal steel structure members (2) are connected in the same way; S10: Use a crane to place the pile cap plate component (4) into the top of all the steel pipe piles (1), ensure that the stopper (405) is stuck into the inner wall of the steel pipe pile (1), adjust the angle of the pile cap plate component (4), ensure that the upper crossbeam (5) can be installed smoothly, hook all the bolts (404) into the long strip cutouts (105) at the top of the steel pipe pile (1), and tighten the nuts to ensure that the tightening degree meets the requirements; S11: Use a crane to hoist the cross beam (5) to the position of the center point connection line of all the steel pipe piles (1) in this span, and use a pressure plate (403) and bolts (402) to fix the cross beam (5) and the steel plate (401) together for each pile, ensuring that the tightening degree meets the requirements; S12: Construction of upper steel structure of beam (5); S13: Continue driving the steel pipe piles (1) of the next span of the steel trestle and installing other components until the entire steel trestle is completed; S14: The same equipment is used for dismantling the steel trestle, and the construction process is the reverse process mentioned above.

12. The construction process of the Bailey beam lower part assembled steel structure system of a steel trestle according to claim 11, characterized in that: The steps S3 and S4 need to ensure that the positioning accuracy of the steel pipe pile (1) is about 50 mm, and should not exceed 100 mm as much as possible. The steel pipe pile (1) with a pile position deviation exceeding 100 mm needs to be re-inserted.

13. The construction process of the Bailey beam lower part assembled steel structure system of a steel trestle according to claim 11, characterized in that: The pile position and angle deviations caused by the driving of the steel pipe piles (1) in steps S3 and S4 are solved by step S8, and the entire installation process does not require secondary processing of the material.

14. The construction process of the Bailey beam lower part assembled steel structure system of a steel trestle according to claim 11, characterized in that: The driving construction of the steel pipe pile (1) in the steps S3 and S4 will inevitably cause a deviation of about 30 mm in the pile top elevation of the steel pipe pile (1). This deviation is solved by placing one or more thin steel plates on the steel plate (401) of the pile cap plate component (4) to ensure that the crossbeam (5) is installed flat.

15. The construction process of the Bailey beam lower part assembled steel structure system of a steel trestle according to claim 11, characterized in that: The prerequisite of "the steel trestles constructed according to the same standard, all materials can be recycled for multiple times, and all materials are not wasted without damage or loss" is based on the following concept: the spacing between the outer walls of the plurality of steel pipe piles (1) needs to be kept at the same spacing, or the range of variation of the spacing is within the range of the length adaptation of the component (205). Although the design load requirements of steel trestles for different engineering projects are different, they can be solved by adjusting the pile length of the steel pipe piles (1), adjusting the front and rear spans, adjusting the crossbeam specifications and the discharge density of the Bailey beam. The steel structure system based on this concept should be regarded as the same invention.

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