Shaped steel arch cast-in-place construction method for river channel reinforced concrete arched box culvert

Abstract

The invention relates to the technical field of steel arch cast-in-place construction, and discloses a riverway reinforced concrete arched box culvert finalization steel arch cast-in-place construction method which comprises the following steps: firstly, completing construction preparation, secondly, carrying out drainage operation or closure and drainage operation on river water of a current operation riverway, and then cleaning a foundation of the riverway. The method comprises the following steps: firstly, carrying out box culvert cushion layer pouring and bottom plate construction, then carrying out box culvert side wall reinforcing steel bar binding and template installation, then carrying out box culvert shaping arch frame and arch crown support design and erection, then carrying out arch culvert inner mold and reinforcing steel bar installation, and then carrying out arch crown concrete pouring and box culvert concrete curing. According to the cast-in-place construction method, in the cast-in-place construction process of the shaped steel arch of the reinforced concrete arched box culvert of the riverway, the water flow in the overflowing riverway is treated in a closure and drainage mode, so that the construction difficulty is reduced through the construction method in which the closure and drainage modes are matched with each other; and the drainage problem is solved.

Description

Technical Field

[0001] The invention relates to the technical field of cast-in-place construction of steel arch frames, and in particular to a cast-in-place construction method of a standardized steel arch frame for a river channel reinforced concrete arch box culvert. Background Art

[0002] Arched reinforced concrete culverts are often used in important projects such as highway bridges, tunnels and large-scale water conservancy projects because of their novel appearance, unique shape and good compressive strength.

[0003] In the prior art, square reinforced concrete culverts have relatively high costs and are difficult to construct, especially arch support frames. The conventional diagonal rod support system has the disadvantages of uneven force, resulting in uneven concrete appearance. The use of customized arch frames effectively avoids such problems. This patented technology is based on the Dexing Coal Mine Project in Fuyuan County. Its box culvert is newly built on the flowing river channel. There are construction problems such as water in the river channel needs to be drained, the river channel is narrow and cannot be prefabricated and hoisted, and drainage in rainy season.

[0004] After searching, it is found that a steel arch frame construction method is disclosed in a Chinese patent document (publication number: CN109056548A). The present invention belongs to the technical field of steel arch frames for arch bridges, and specifically relates to a steel arch frame construction method, which comprises at least the following steps: 1) assembling steel arch frames, 2) installing the steel arch frames assembled in step 1), 3) pouring concrete on the main arch ring of the steel arch frames installed in step 2), and 4) dismantling the steel arch frames in step 3); the present invention solves the problem that the conventional construction of multiple span arch bridges under poor construction conditions such as weak foundations and deep mountains and canyons in the prior art cannot meet the construction needs and the tied Bailey steel arch frames cannot arbitrarily adjust the linearity of the arch axis and cannot meet the needs of various linear arch bridge construction. The present invention is suitable for the construction of multiple span arch bridges that cannot be constructed by conventional schemes under poor construction conditions such as weak foundations and deep mountains and canyons. The arch axis line shape is adjusted by adjusting the length of the connecting rod, and various arch bridge curve line shapes can be adjusted to meet the needs of arch bridge construction with various linear shapes. However, the present invention still has the following defects:

[0005] Although the above-mentioned steel arch frame construction method has achieved the construction of various span arch bridges that cannot be constructed by conventional schemes under adverse construction conditions such as weak foundations and deep mountain canyons, and can adjust the arch axis line shape by adjusting the length of the connecting rods, various arch bridge curve lines can be adjusted to meet the construction needs of arch bridges with various lines, it still has the disadvantages of relatively high cost and difficult construction of square reinforced concrete culverts in the prior art, especially the arch support frame. The conventional inclined rod support system has the disadvantages of uneven force resulting in uneven quality of concrete appearance molding. The use of customized and shaped arch frames effectively avoids such problems. This patented technology is based on the Dexing Coal Mine Project in Fuyuan County. Its box culvert is newly built on the flowing river channel. There are construction problems such as water in the river channel that needs to be drained, narrow river channels that cannot prefabricate and hoist box culverts, and drainage in rainy seasons. Summary of the invention

[0006] The purpose of the present invention is to provide a cast-in-place construction method for a standardized steel arch frame of a reinforced concrete arch box culvert in a river channel, which solves the problems in the background technology that the square reinforced concrete culvert in the prior art has relatively high cost and is difficult to construct, especially the arch support frame, which has the disadvantages of uneven force and uneven quality of the concrete appearance molding due to the conventional inclined rod support system. The use of a customized standardized arch frame effectively avoids such problems. This patented technology relies on the Dexing Coal Mine Project in Fuyuan County. Its box culvert is newly built on the flowing river channel, and there are construction problems such as water in the river channel needs to be drained, the river channel is narrow and cannot prefabricate the hoisting box culvert, and drainage in the rainy season.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A cast-in-place construction method for a standardized steel arch frame of a river channel reinforced concrete arch box culvert comprises the following steps:

[0009] S1: First, complete the construction preparation according to the current environmental conditions of the construction area:

[0010] S2: diversion of river water from the current operating river or interception and re-diversion of river water;

[0011] S3: Clearing the riverbed;

[0012] S4: box culvert cushion pouring and bottom plate construction;

[0013] S5: Box culvert side wall reinforcement binding and formwork installation;

[0014] S6: Design and installation of box culvert arch frame and arch support;

[0015] S7: Installation of inner formwork and reinforcement of arch box culvert;

[0016] S8: pouring of vault concrete;

[0017] S9: Box culvert concrete maintenance;

[0018] S10: Removal of box culvert formwork and backfilling of fertilizer trough.

[0019] Preferably, in S2, the method for diverting the river water is to select a suitable retaining wall, and dig a water diversion channel with suitable width and depth at the lower corner of the selected retaining wall to divert the river water from the river, and the water diversion channel is made of rubble stones at a suitable height near the box culvert.

[0020] Preferably, in S2, the specific steps of intercepting and re-diverting the water in the current operating river are:

[0021] S2.1: First, use an excavator to deposit mudstone and river sand in the flowing river channel at the starting section of the box culvert;

[0022] S2.2: The river water is intercepted by piling up mudstone and river sand to form a cofferdam;

[0023] S2.3: According to the current situation, galvanized steel pipes are used to divert water to the bottom plate of the next construction section of the completed box culvert;

[0024] S2.4: After the construction of the bottom plate of the initial section of the box culvert is completed, the galvanized steel pipe will be removed to allow the water in the river to flow out from the completed bottom plate.

[0025] Preferably, in S3, clearing the riverbed is specifically performed based on the measurement results of the water flow elevation in the flowing riverbed and the calculated longitudinal slope of the box culvert, and removing the humus soil, silt, garbage, etc. of the box culvert by an excavator.

[0026] Preferably, in S4, the specific steps of pouring the box culvert cushion layer and constructing the bottom plate are:

[0027] S4.1: According to the design base elevation and design drawings;

[0028] S4.2: Concrete the cushion layer on the cleaned riverbed;

[0029] S4.3: Carry out the layout, line inspection and elevation measurement on the completed cushion layer in sequence;

[0030] S4.4: Review the line-laying, line-checking and elevation measurement work and make sure they are correct.

[0031] Preferably, in S5, the operation requirements for tying the steel bars of the box culvert side wall are:

[0032] (1) According to the steel bar specifications, confirm that the steel bars are connected by straight threads, and the joints of two adjacent steel bars must be staggered by 35d;

[0033] (2) Use "double F clips" to fix the side wall reinforcement.

[0034] Preferably, in S6, the specific steps of designing and supporting the box culvert shaped arch frame and arch top support are:

[0035] S6.1: Select the raw material steel pipe and test its wall thickness, outer diameter and other parameter data;

[0036] S6.2: Use mapping software to measure the inner arch ring dimensions of the box culvert arch;

[0037] S6.3: Use drawing software to perform layout operations on the arch frame and obtain the layout drawings;

[0038] S6.4: According to the layout drawings, conduct field layout of welding samples to obtain the finalized steel arch frame for the structure divided into two parts;

[0039] S6.5: Fasteners are used to connect and fix the welded arches;

[0040] S6.6: Carry out mass production of shaped steel arch frames;

[0041] S6.7: Design of vault supports;

[0042] S6.8: Erection of vault supports.

[0043] Preferably, in said S7, the inner formwork and the steel bar installation of the arch box culvert are specifically as follows: firstly, the arch top steel bar is tied on the laid wood plywood, the arch top steel bar is anchored into the side wall by means of a straight anchor, and horse stool bars are arranged on the arch top steel bar.

[0044] Preferably, in S8, the concrete pouring method adopts a truck pump, and the concrete pouring sequence is generally performed according to the division of the construction sections in the vertical direction, and is effectively vibrated by a concrete vibrator.

[0045] Preferably, in S10, the specific indicators for removing the box culvert formwork are:

[0046] (1) Conduct targeted safety technical briefings before removing the formwork and keep records;

[0047] (2) The box culvert side wall formwork can be removed under the premise of ensuring that the edges and corners are not damaged;

[0048] (3) Before removing the arch formwork, there must be a concrete strength report, and the concrete can only be removed when the strength reaches 100%;

[0049] (4) The order of dismantling the formwork should follow the principle of dismantling the support first and then the support, and dismantling the rear support first, from top to bottom;

[0050] In S10, the fertilizer trough is backfilled in layers, and the layer thickness is ≤300mm. A manual rammer is used to compact within 500mm above the box culvert top, a 22t roller is used to compact from 0.5m to 1.5m, and vibration compaction is performed above 1.5m. The compaction coefficient after compaction is ≥0.9.

[0051] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0052] 1. The present invention treats the water flow in the flowing river channel by means of interception and diversion during the cast-in-place construction of the standardized steel arch frame of the reinforced concrete arch box culvert in the river channel. The construction method in which the interception and diversion methods cooperate with each other reduces the construction difficulty and solves the drainage problem.

[0053] 2. The present invention adopts reasonable construction section division to carry out segmented management and segmented construction of the arch box culvert for the flowing river. According to the 3D model of the box culvert, its stress characteristics are analyzed. According to its stress characteristics and the simplicity of construction, the construction section division of "vertical division into two, horizontal segmentation, and detailed interval" is adopted to ensure the drainage of river water and the stacking of turnover materials during the rainy season.

[0054] 3. Compared with the traditional method of connecting the arch plate steel bar and the side wall vertical steel bar into a whole, the present invention adopts a one-to-two design, which effectively avoids the problem of difficult steel bar installation after connection, and avoids the problem of deformation of the arch top steel bar when the connection part is tightened after the steel bar is connected with the sleeve, making it impossible to install; finally, the problem of being unable to be processed on the threading machine is solved by optimizing the processing style of the arch plate steel bar, inserting the side wall in a straight anchor manner, and laying out the steel bar, especially the arch top steel bar. After the laying out is completed, samples are made on site to see whether it is feasible and convenient.

[0055] 4. The present invention adopts a support form that combines a standardized steel arch frame with a full-span support frame to optimize the force system of the reinforced concrete arch box culvert support frame, optimizes the force system of the entire frame, reduces construction risks, and ensures the construction quality of the arch box culvert vault.

[0056] 5. The present invention divides the shaped steel arch frame into two parts to facilitate the dismantling of the arch frame. At the same time, two rotating fasteners are used to fix the shaped steel arch frame, which greatly facilitates the dismantling of the shaped steel arch frame while ensuring strength and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic diagram of the specific steps of the cast-in-place construction method of the standardized steel arch frame of the river channel reinforced concrete arch box culvert of the present invention;

[0058] Figure 2 It is a schematic diagram of the specific steps of the operation of intercepting and then diverting the river water in the current operation river channel according to the present invention;

[0059] Figure 3 It is a schematic diagram of the specific steps of pouring the cushion layer of the box culvert and constructing the bottom plate of the present invention;

[0060] Figure 4 It is a schematic diagram of the specific steps of designing and supporting the box culvert shaped arch frame and arch top support of the present invention. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] Example 1

[0063] See also Figure 1-4 A method for casting in situ a steel arch frame of a river channel reinforced concrete arch box culvert comprises the following steps:

[0064] S1: First, complete the construction preparation according to the current environmental conditions of the construction area:

[0065] S2: diversion of river water from the current operating river or interception and re-diversion of river water;

[0066] S3: Clearing the riverbed;

[0067] S4: box culvert cushion pouring and bottom plate construction;

[0068] S5: Box culvert side wall reinforcement binding and formwork installation;

[0069] S6: Design and installation of box culvert arch frame and arch support;

[0070] S7: Installation of inner formwork and reinforcement of arch box culvert;

[0071] S8: pouring of vault concrete;

[0072] S9: Box culvert concrete maintenance;

[0073] S10: Removal of box culvert formwork and backfilling of fertilizer trough.

[0074] In S1, the construction preparation is to select a flat road and a crane support site to ensure that the road for construction machinery to travel and the site for the crane to be supported are flat and solid.

[0075] In S1, the construction preparation is to calculate the longitudinal slope of the box culvert bottom plate according to the existing water flow height difference in the flowing river channel and the total length of the proposed box culvert.

[0076] In S1, the construction preparation is to lay out and check the box culvert based on the existing topography, mark the elevation and length with red paint on the retaining walls on both sides, and start construction after verification.

[0077] In S2, the method of diverting the river water from the river channel is to select a suitable retaining wall, and to dig a water diversion channel with a suitable width and depth at the lower corner of the selected retaining wall to divert the river water from the river channel. In addition, rubble is used to make water retaining stones of suitable height near the box culvert of the water diversion channel. Through the diversion method adopted, the water flow in the water diversion channel will not scour the box culvert position, and the foundation soil in the construction area will be protected from being washed away by the water in the river channel.

[0078] In S3, the river channel clearing is specifically based on the measurement results of the water flow elevation in the flowing river channel and the calculated longitudinal slope of the box culvert, and the box culvert humus, silt, garbage, etc. are cleared by an excavator.

[0079] In S3, before clearing the riverbed, an excavator is used to dig pits at irregular intervals on the riverbed to check whether the soil quality of the box culvert foundation is consistent with the geological survey report. For areas with poor soil quality or foundation bearing capacity that does not meet the design requirements, foundation replacement treatment must be carried out.

[0080] In S7, the inner formwork and reinforcement installation of the arch box culvert are as follows: first, the arch top reinforcement is tied on the laid wood plywood, the arch top reinforcement is anchored into the side wall by a straight anchor method, and horse stool reinforcement is set on the arch top reinforcement.

[0081] In S8, the concrete pouring method adopts automobile pump pouring, and the concrete pouring sequence is generally poured according to the division of construction sections in the vertical direction, and is effectively vibrated by a concrete vibrator.

[0082] In S9, the indicators for curing box culvert concrete are: after the bottom plate is poured, it should be covered with plastic film to prevent premature evaporation of water, and watered for curing for about 8 hours. The curing time should not be less than 7 days.

[0083] In S9, the indicators for curing box culvert concrete are: watering and curing should be carried out about 8 hours after the side walls and arch are cast; the 1000mm wide casting port of the arch should be covered with plastic film; and the curing time should not be less than 7 days.

[0084] In S10, the specific indicators for the removal of box culvert formwork are:

[0085] (1) Conduct targeted safety technical briefings before removing the formwork and keep records;

[0086] (2) The box culvert side wall formwork can be removed under the premise of ensuring that the edges and corners are not damaged;

[0087] (3) Before removing the arch formwork, there must be a concrete strength report, and the concrete can only be removed when the strength reaches 100%;

[0088] (4) The order of dismantling the formwork should follow the principle of dismantling the support first and then the support, and dismantling the rear support first, from top to bottom;

[0089] In S10, the fertilizer trough is backfilled in layers, and the layer thickness is ≤300mm. A manual rammer is used to compact within 500mm above the box culvert top, a 22t roller is used to compact from 0.5m to 1.5m, and vibratory compaction is used above 1.5m. The compaction coefficient after compaction is ≥0.9.

[0090] In S5, the requirements for the steel bar binding of the box culvert side wall are:

[0091] (1) According to the steel bar specifications, confirm that the steel bars are connected by straight threads, and the joints of two adjacent steel bars must be staggered by 35d;

[0092] (2) Use "double F clips" to fix the side wall reinforcement.

[0093] Example 2

[0094] See also Figure 2 A method for cast-in-place construction of a standardized steel arch frame for a reinforced concrete arch box culvert in a river channel. In S2, the specific steps of intercepting and diverting the river water in the current operation river channel are as follows:

[0095] S2.1: First, use an excavator to deposit mudstone and river sand in the flowing river channel at the starting section of the box culvert;

[0096] S2.2: The river water is intercepted by piling up mudstone and river sand to form a cofferdam;

[0097] S2.3: According to the current situation, galvanized steel pipes are used to divert water to the bottom plate of the next construction section of the completed box culvert;

[0098] S2.4: After the construction of the bottom plate of the initial section of the box culvert is completed, the galvanized steel pipe will be removed to allow the water in the river to flow out from the completed bottom plate.

[0099] In S2.3, the condition factors include at least the current water flow in the river, the elevation of the starting section of the box culvert and the drainage slope parameter data.

[0100] In S2, when the operation encounters two mountains on both sides of the narrowest part of the entire river channel, sandbags are used in the bottom plate of the upstream box culvert to intercept the water flow and then divert it.

[0101] Example 3

[0102] See also Figure 3A method for casting a standardized steel arch frame of a reinforced concrete arch box culvert in a river channel. In S4, the specific steps of casting the box culvert cushion layer and the bottom plate construction are as follows:

[0103] S4.1: According to the design base elevation and design drawings;

[0104] S4.2: Concrete the cushion layer on the cleaned riverbed;

[0105] S4.3: Carry out the layout, line inspection and elevation measurement on the completed cushion layer in sequence;

[0106] S4.4: Review the line-laying, line-checking and elevation measurement work and make sure they are correct.

[0107] In S4.2, the dimensions of the cast cushion layer must be 90mm-110mm wider than the box culvert bottom plate.

[0108] Example 4

[0109] See also Figure 4 , a cast-in-place construction method for a standardized steel arch frame of a reinforced concrete arch box culvert in a river channel, in S6, the specific steps of designing and supporting the standardized arch frame and the arch top support of the box culvert are as follows:

[0110] S6.1: Select the raw material steel pipe and test its wall thickness, outer diameter and other parameter data;

[0111] S6.2: Use mapping software to measure the inner arch ring dimensions of the box culvert arch;

[0112] S6.3: Use drawing software to perform layout operations on the arch frame and obtain the layout drawings;

[0113] S6.4: According to the layout drawings, conduct field layout of welding samples to obtain the finalized steel arch frame for the structure divided into two parts;

[0114] S6.5: Fasteners are used to connect and fix the welded arches;

[0115] S6.6: Carry out mass production of shaped steel arch frames;

[0116] S6.7: Design of vault supports;

[0117] S6.8: Erection of vault supports.

[0118] In S6.3, the arch frame layout operation requires calculating the spacing of the support frame poles, the number of arc segments to be set according to the box culvert size, and adding a vertical pole at each node, and then adding diagonal supports at the connection between the vertical pole and the cross bar.

[0119] In S6.7: According to the designed arch support, determine that the double fasteners are used to bear the force on the lower full-frame, so that the longitudinal and transverse horizontal bars of the full-frame support frame are connected to the arch frame with fasteners, and two longitudinal horizontal bars are used on each side of the top of the arch frame to connect the arch frame of each construction section into a whole to prevent the entire arch frame from tipping over.

[0120] In S6.8, the full-span support frame is erected according to the special construction plan that has been prepared, reviewed and approved. The structural requirements such as the longitudinal and transverse spacing of the vertical poles, the step distance, and the scissors brace shall be based on the plan, and the top longitudinal horizontal bar of the full-span frame must be fixed according to the measured elevation to prevent the arch frame from being on the same plane, thereby affecting the forming quality of the box culvert.

[0121] In S6.8, the arch frames are connected by two rotating fasteners, and the connected arch frames are then connected and fixed to the installed and straightened longitudinal horizontal rods of the full-frame below.

[0122] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for casting in situ a steel arch frame of a river channel reinforced concrete arch box culvert, characterized in that: The following steps are involved: S1: First, complete the construction preparation according to the current environmental conditions of the construction area: S2: diversion of river water from the current operating river or interception and re-diversion of river water; S3: Clearing the riverbed; S4: box culvert cushion pouring and bottom plate construction; S5: Box culvert side wall reinforcement binding and formwork installation; S6: Design and installation of box culvert arch frame and arch support; S7: Installation of inner formwork and reinforcement of arch box culvert; S8: pouring of vault concrete; S9: Box culvert concrete maintenance; S10: Removal of box culvert formwork and backfilling of fertilizer trough.

2. The method for casting in situ a standardized steel arch frame of a river channel reinforced concrete arch box culvert according to claim 1 is characterized by: In S2, the method for diverting the river water is to select a suitable retaining wall, and dig a water diversion channel with suitable width and depth at the lower corner of the selected retaining wall to divert the river water from the river, and the water diversion channel is made of rubble stones at a suitable height near the box culvert.

3. The method for casting in situ the standardized steel arch frame of a river channel reinforced concrete arch box culvert according to claim 1 is characterized by: In S2, the specific steps of intercepting and diverting the water in the current operating river are as follows: S2.1: First, use an excavator to deposit mudstone and river sand in the flowing river channel at the starting section of the box culvert; S2.2: The river water is intercepted by piling up mudstone and river sand to form a cofferdam; S2.3: According to the current situation, galvanized steel pipes are used to divert water to the bottom plate of the next construction section of the completed box culvert; S2.4: After the construction of the bottom plate of the initial section of the box culvert is completed, the galvanized steel pipe will be removed to allow the water in the river to flow out from the completed bottom plate.

4. The method for casting in situ a standardized steel arch frame of a river channel reinforced concrete arch box culvert according to claim 1 is characterized by: In the step S3, the clearing of the riverbed is specifically carried out based on the measurement result of the water flow elevation in the flowing riverbed and the calculated longitudinal slope of the box culvert, and the box culvert humus, silt, garbage, etc. are cleared by an excavator.

5. The method for casting in situ the standardized steel arch frame of a river channel reinforced concrete arch box culvert according to claim 1 is characterized by: In S4, the specific steps of pouring the box culvert cushion layer and constructing the bottom plate are as follows: S4.1: According to the design base elevation and design drawings; S4.2: Concrete the cushion layer on the cleaned riverbed; S4.3: Carry out the layout, line inspection and elevation measurement on the completed cushion layer in sequence; S4.4: Review the line-laying, line-checking and elevation measurement work and make sure they are correct.

6. The method for casting in situ a standardized steel arch frame of a river channel reinforced concrete arch box culvert according to claim 1 is characterized by: In S5, the requirements for binding the steel bars of the box culvert side wall are: (1) According to the steel bar specifications, confirm that the steel bars are connected by straight threads, and the joints of two adjacent steel bars must be staggered by 35d; (2) Use "double F clip" to fix the side wall reinforcement.

7. The method for casting in situ the standardized steel arch frame of a river channel reinforced concrete arch box culvert according to claim 1 is characterized by: In S6, the specific steps of designing and supporting the box culvert shaped arch frame and arch top support are as follows: S6.1: Select the raw material steel pipe and test its wall thickness, outer diameter and other parameter data; S6.2: Use mapping software to measure the inner arch ring dimensions of the box culvert arch; S6.3: Use drawing software to perform layout operations on the arch frame and obtain the layout drawings; S6.4: According to the layout drawings, conduct field layout of welding samples to obtain the finalized steel arch frame for the structure divided into two parts; S6.5: Fasteners are used to connect and fix the welded arches; S6.6: Carry out mass production of shaped steel arch frames; S6.7: Design of vault supports; S6.8: Erection of vault supports.

8. The method for casting in situ the standardized steel arch frame of a river channel reinforced concrete arch box culvert according to claim 1 is characterized by: In the above S7, the inner formwork and steel bar installation of the arch box culvert are specifically as follows: first, the arch top steel bars are tied on the laid wood plywood, the arch top steel bars are anchored into the side wall in a straight anchor manner, and horse stool bars are arranged on the arch top steel bars.

9. The method for casting in situ the standardized steel arch frame of a river channel reinforced concrete arch box culvert according to claim 1 is characterized by: In the above S8, the concrete pouring method adopts a truck pump, and the concrete pouring sequence is generally performed according to the division of the construction sections in the vertical direction, and is effectively vibrated by a concrete vibrator.

10. The method for casting in situ the standardized steel arch frame of a river channel reinforced concrete arch box culvert according to claim 1 is characterized by: In S10, the specific indicators for removing the box culvert formwork are: (1) Conduct targeted safety technical briefings before removing the formwork and keep records; (2) The box culvert side wall formwork can be removed under the premise of ensuring that the edges and corners are not damaged; (3) Before removing the arch formwork, there must be a concrete strength report, and the concrete can only be removed when the strength reaches 100%; (4) The order of dismantling the formwork should follow the principle of dismantling the support first and then the support, and dismantling the rear support first, from top to bottom; In S10, the fertilizer trough is backfilled in layers, and the layer thickness is ≤300mm. A manual rammer is used to compact within 500mm above the box culvert top, a 22t roller is used to compact from 0.5m to 1.5m, and vibration compaction is performed above 1.5m. The compaction coefficient after compaction is ≥0.9.

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