Construction method of high fill super-long split assembling steel corrugated pipe culvert

Abstract

The application discloses a kind of high fill super-long piece assembling steel corrugated pipe culvert construction methods, comprising: measuring and setting out;Foundation pit excavation;Bearing capacity detection;Culvert base gravel layer construction;Secondary bearing capacity detection;Secondary measurement and setting out;Steel corrugated pipe installation;Sealing and corrosion protection treatment;Culvert backfilling;Conversion working face;Culvert inlet and outlet construction.Through the way of piece assembling steel corrugated pipe from middle to both sides in the way of piece construction, improve overall construction efficiency;Through multiple bearing capacity detection and measurement and setting out process, ensure that the bearing capacity of foundation pit meets the design requirements, and provide accurate position and size for pipe culvert piece construction;By setting positioning steel bar pile and cement cushion pillow, prevent corrugated pipe from shifting during construction process, improve the bearing capacity and stability of culvert;Through reasonable piece assembling steel corrugated pipe technology, increase flat plate foaming sealing strip at interface between piece assembling steel corrugated pipe, and use hot-melt asphalt to seal bolt and connecting joint, avoid corrosion and water seepage.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steel corrugated pipe culvert construction, more specifically, relates to a high fill super long split assembly steel corrugated pipe culvert construction method. BACKGROUND

[0002] The assembled steel corrugated pipe culvert construction is a method of dividing the steel corrugated pipe culvert into several smaller segments and then assembling them on site. The assembled steel corrugated pipe culvert is made of high-strength, corrosion-resistant high-quality steel, has good bearing capacity and durability, can adapt to various geological conditions, and has been widely used in various projects, especially in the fields of highways, urban roads, water conservancy projects, etc., and has become a common construction method. Compared with traditional concrete culverts, in the construction process of assembled steel corrugated pipe culverts, each segment can be prefabricated in the factory, and only assembly is required on site, thereby greatly improving construction efficiency and enabling rapid completion of construction tasks, which is conducive to shortening the project cycle. During on-site construction, each link can be monitored and managed to ensure construction quality. The assembled steel corrugated pipe culvert construction method has the advantage of relatively low cost compared to traditional construction methods, and with the development of engineering technology, the construction technology and experience of steel corrugated pipe culverts have become relatively mature.

[0003] Although the assembled steel corrugated pipe culvert has advantages in many aspects, there are still some challenges and problems in the actual construction of super long assembled steel corrugated pipe culverts, such as the need for precise control of the position and connection of each segment in the construction of super long assembled steel corrugated pipe culverts, which is difficult to construct; there are many links involved in the construction process of super long assembled steel corrugated pipe culverts, and the construction quality is difficult to control; the steel corrugated pipe culvert is long, and problems such as deformation and collapse may occur during construction, resulting in high safety risks; steel corrugated pipe culvert construction usually requires excavation and backfilling, so weather conditions such as rain, snow, and wind will have a significant impact on construction progress; the steel corrugated pipe culvert is long, requiring more materials and equipment investment, and more manpower and material support during construction, resulting in high costs. SUMMARY

[0004] In view of the above defects or improvement needs of the prior art, the present application provides a high fill super long split assembly steel corrugated pipe culvert construction method, which improves the overall construction efficiency by split construction and installation of steel corrugated pipe segments from the middle to both sides; ensures that the bearing capacity of the foundation pit meets the design requirements and provides accurate position and size for the pipe culvert split construction through multiple bearing capacity detection and measurement lofting procedures; prevents the corrugated pipe from shifting during construction by setting positioning steel bars and cement cushion pillows, and improves the bearing capacity and stability of the culvert; and increases flat foam sealing strips at the interface between steel corrugated pipe segments through a reasonable steel corrugated pipe segment assembly process, and uses hot melt asphalt to seal the bolts and connection joints to prevent corrosion and water seepage.

[0005] To achieve the above object, the application provides a high fill super-long split assembled steel corrugated pipe culvert construction method, comprising the following steps:

[0006] S1, measurement and line laying: on the existing roadbed surface, perform roadbed filling and culvert axis lofting in sections, and measure the width and elevation of the roadbed surface along the axis;

[0007] S2, foundation pit excavation: according to the design culvert bottom elevation and the construction site measurement results, excavate a foundation pit on the existing roadbed top surface;

[0008] S3, bearing capacity detection: use a heavy roller to compact the excavated foundation and detect the bearing capacity of the foundation;

[0009] S4, culvert foundation sand gravel layer construction: fill the bottom of the foundation pit with two layers of permeable granular materials such as sand gravel or graded gravel, and set the axial pre-camber of the steel corrugated pipe pipeline at the bottom of the foundation pit;

[0010] S5, secondary bearing capacity detection: use a heavy roller to compact the sand gravel soil in layers and detect the bearing capacity;

[0011] S6, secondary measurement and lofting: loft according to the culvert design axis, position and number steel reinforcement piles at fixed distances of 4-6 m, and measure the elevation of the steel reinforcement piles with a level meter;

[0012] S7, steel corrugated pipe installation: place the prefabricated steel corrugated pipe pieces in the foundation pit, simultaneously assemble from the middle to both sides, and place cement pads at the bottom of the culvert for supporting and positioning the steel corrugated pipe;

[0013] S8, sealing and corrosion prevention treatment: add flat foaming sealing strips at the interfaces between the steel corrugated pipe pieces, and use hot melt asphalt to seal the bolts and connection joints; spray two coats of emulsified asphalt to prevent corrosion inside and outside the steel corrugated pipe pieces;

[0014] S9, culvert backfilling: use filling materials such as sand gravel soil and foamed lightweight soil to symmetrically and alternately backfill the culvert on both sides of the foundation pit;

[0015] S10, conversion of working face: after completing 2 / 3 of the steel corrugated pipe culvert construction, start 2 / 3 of the roadbed filling construction, and strictly follow the working contents of S1 to S9 to start 1 / 3 of the roadbed section steel corrugated pipe culvert construction;

[0016] S11, culvert inlet and outlet construction: after the steel corrugated pipe culvert is installed, construct the bottom base concrete at the culvert outlet, and after the roadbed is stable, pour the wall body and eave concrete.

[0017] Further, the S7 comprises the following steps:

[0018] S701: Start the steel corrugated pipe installation at the center position of the corresponding framing construction surface, each section of the steel corrugated pipe includes three pipe pieces, when laying the first steel corrugated pipe piece, the quarter position of the pipe piece is consistent with the culvert axis, the second steel corrugated pipe piece and the third steel corrugated pipe piece are sequentially assembled and preliminarily fixed by bolts; a cement cushion is arranged at the bottom of the culvert for supporting and positioning the corrugated pipe;

[0019] S702: After the first section, the second section is installed in two directions respectively; the longitudinal joints of the pipe pieces are staggered by half; the first steel corrugated pipe piece and the second steel corrugated pipe piece are connected to the first steel corrugated pipe piece of the first section by bolts, and after all the bolts are preliminarily fixed, the third steel corrugated pipe piece is connected to the second section and the bolts are preliminarily fixed;

[0020] S703: The center line and the elevation of the unadjusted steel corrugated pipe culvert are adjusted to the design requirements by using the prefabricated cement cushion, and the subsequent steel corrugated pipe pieces are installed in the method of S701 and S702, the steel corrugated pipe is assembled along the culvert axis, and is adjusted to meet the design axis and longitudinal slope requirements;

[0021] S704: During the construction of the culvert inlet and outlet pipe pieces, when the axis of the pipe culvert is orthogonal to the route, the exposed surface of the culvert at the inlet and outlet is consistent with the route; when the axis of the pipe culvert is oblique to the route, the manufacturer is submitted in advance for processing and customizing according to the oblique angle, and the trial assembly is performed at the factory, and the inlet and outlet are directly assembled on site;

[0022] S705: After the steel corrugated pipe is installed and the axis and the longitudinal slope are adjusted, all the bolts are fixed again to ensure that the torsion force meets the design requirements.

[0023] Further, during the installation of the steel corrugated pipe piece, the two ends of the steel corrugated pipe piece at the top are outside the connection port, and the two ends of the steel corrugated pipe piece at the bottom of the foundation pit are inside the connection port.

[0024] Further, during the installation of the steel corrugated pipe piece, the first gasket and the second gasket are preferentially installed before the installation of the bolts.

[0025] Further, during the longitudinal assembly of the steel corrugated pipe, the upstream inlet pipe section end should be placed outside the connection port of the downstream outlet pipe section, and should not be placed reversely.

[0026] Further, the slope line of the foundation pit is 1:0.75, and the width of the foundation pit is greater than or equal to 2 times the diameter of the steel corrugated pipe, so as to ensure that the working field outside one side of the steel corrugated pipe is greater than or equal to 1m.

[0027] Further, the thickness of each layer of the filling layer is 25-30cm.

[0028] Further, the sealing strip is a high-temperature-resistant and anti-aging silica gel sealing strip; the sealing strip is 4-6mm thick, 10-20mm wide, and the length is consistent with the overlap length between the pipe pieces.

[0029] Further, the S9 comprises the following steps:

[0030] S901: using filling materials such as gravel soil, natural sand, and foamed lightweight soil, symmetrically and alternately performing on both sides of the foundation pit, layer-by-layer laying and layer-by-layer compacting; during the construction of the backfill layers of the first layer to the third layer, the wedge-shaped area of the pipe culvert and the bottom of the foundation pit is compacted by vertical ramming; after completion, the natural sand backfilling of the foundation pit is supplemented by the water compaction method;

[0031] S902: during the subsequent construction of the backfill layers of the fourth layer to the thirteenth layer, small compaction machinery or ramming tools are used for operation; when filling below the center line of the culvert, after each layer of compaction is completed, the wedge-shaped area of the pipe culvert and the bottom of the foundation pit is supplemented by the water compaction method;

[0032] S903: when layer-by-layer filling on both sides of the steel corrugated pipe culvert foundation pit, the operation direction of the ramming machinery is consistent with the direction of the culvert axis, and the same numbered sides are alternately compacted; after compaction, the next layer of filling is performed; when performing compaction on the filling of the top of the steel corrugated pipe culvert, the operation direction of the compaction or ramming machinery should be perpendicular to the length direction of the steel corrugated pipe culvert.

[0033] Further, the loose laying thickness of the backfill layer of the culvert is 20-25cm, and the compacted thickness is 18-20cm.

[0034] Overall, compared with the prior art, the above technical solutions conceived by the present application can achieve the following beneficial effects:

[0035] 1. The construction method of the present application, by dividing the construction and installing the steel corrugated pipe piece from the middle to both sides, makes the construction process more orderly and continuous, avoids phenomena such as work stoppage and waiting, thereby improving the overall construction efficiency, enabling timely discovery and handling of problems that occur during construction, reducing construction risks, ensuring engineering quality, better resource allocation, and reducing the impact on the surrounding environment.

[0036] 2. The construction method of the present application, by multiple bearing capacity detection and measurement lofting procedures, ensures that the bearing capacity of the foundation pit meets the design requirements, provides a reliable basis for engineering design, makes the design scheme more reasonable and economical, provides accurate positions and sizes for pipe culvert division construction, reduces the number of adjustments during the construction process, ensures construction accuracy, improves construction efficiency, helps to evaluate the safety performance of the engineering structure, and ensures the safety and reliability of the engineering in the use process.

[0037] 3. The construction method of the present application guides the installation of the steel corrugated pipe by setting the positioning steel pile and the cement cushion during the installation process of the steel corrugated pipe, ensures the accurate position of the axis of the steel corrugated pipe, avoids deviation or inclination, ensures that the steel corrugated pipe is accurately placed at the designed position, improves the carrying capacity and stability of the culvert, improves the installation quality and safety, and reduces the construction difficulty.

[0038] 4. The construction method of the present application improves the carrying capacity and stability of the culvert, improves the installation quality and safety, and reduces the construction difficulty.

[0039] 5. The construction method of the present application reduces the cost of pipe culvert installation, and the pipe culvert structure composed of three pipe pieces is relatively simple, facilitating construction and installation, maintenance and repair, and reducing production and maintenance costs. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 A flowchart of a high fill super long split piece assembled steel corrugated pipe culvert construction method according to an embodiment of the present application;

[0041] Figure 2 A structure diagram of a steel corrugated pipe culvert of a high fill super long split piece assembled steel corrugated pipe culvert construction method according to an embodiment of the present application;

[0042] Figure 3 A longitudinal connection diagram of a steel corrugated pipe culvert of a high fill super long split piece assembled steel corrugated pipe culvert construction method according to an embodiment of the present application;

[0043] Figure 4 A steel corrugated pipe joint assembly diagram of a high fill super long split piece assembled steel corrugated pipe culvert construction method according to an embodiment of the present application;

[0044] Figure 5 A structure diagram of a steel corrugated pipe culvert of a high fill super long split piece assembled steel corrugated pipe culvert construction method according to an embodiment of the present application; Figure 4 A structure diagram of a steel corrugated pipe culvert of a high fill super long split piece assembled steel corrugated pipe culvert construction method according to an embodiment of the present application;

[0045] Figure 6 A flowchart of a high fill super long split piece assembled steel corrugated pipe culvert construction method according to an embodiment of the present application;

[0046] Figure 7 A flowchart of a high fill super long split piece assembled steel corrugated pipe culvert construction method according to an embodiment of the present application;

[0047] Figure 8 A backfill step flow chart of the high fill super long split piece assembled steel corrugated pipe culvert construction method is provided for the embodiment of the present application.

[0048] In all the drawings, the same reference signs represent the same technical features, specifically: 1-steel corrugated pipe, 11-first steel corrugated pipe piece, 12-second steel corrugated pipe piece, 13-third steel corrugated pipe piece, 2-filling layer, 3-backfill layer of culvert back, 4-cement cushion, 5-bolt, 6-first gasket, 7-second gasket. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0050] As shown in Figures 1 to 8 The embodiment of the present application provides a high fill super long split piece assembled steel corrugated pipe culvert construction method, which comprises the following steps:

[0051] S1, measurement and line laying: on the existing roadbed surface, the roadbed filling and the culvert axis lofting are performed in sections, and the width and elevation of the roadbed surface are measured along the axis;

[0052] S2, foundation pit excavation: according to the design culvert bottom elevation and the construction site measurement results, the foundation pit is excavated on the existing roadbed top surface;

[0053] S3, bearing capacity detection: the excavated foundation is rolled by a heavy roller and the bearing capacity of the foundation is detected;

[0054] S4, culvert foundation sand gravel layer construction: the bottom of the foundation pit is provided with a steel corrugated pipe pipeline axial pre-camber, and two layers of filling sand gravel or graded gravel and the like are filled with water-permeable bulk materials;

[0055] S5, secondary bearing capacity detection: the filling layer sand gravel soil is rolled by a heavy roller in layers, and the bearing capacity is detected;

[0056] S6, secondary measurement and lofting: according to the culvert design axis lofting, the steel reinforcement piles are positioned and numbered at fixed distances of 4-6m, and the elevation of the steel reinforcement piles is measured by a level meter;

[0057] S7, steel corrugated pipe installation: the prefabricated steel corrugated pipe is placed in the foundation pit piece by piece, and is assembled simultaneously from the middle to both sides, and the cement cushion 4 for supporting and positioning the steel corrugated pipe is placed at the bottom of the culvert pipe;

[0058] S8, sealing and corrosion prevention treatment: adding flat foamed sealing strips at the interfaces between the steel corrugated pipe segments, and using hot melt asphalt to seal the bolts and the connecting joints; using spraying to apply two coats of emulsified asphalt to the inside and outside of the steel corrugated pipe segments for corrosion prevention treatment;

[0059] S9, backfilling of the culvert: using sand and gravel soil, foamed light soil or the like as the filling material to symmetrically and alternately perform backfilling of the culvert on both sides of the foundation pit;

[0060] S10, conversion of the working face: after the construction of the 2 / 3 width steel corrugated pipe culvert is completed, the construction of the 2 / 3 width embankment filling is started, and the construction of the steel corrugated pipe culvert of the 1 / 3 width embankment section is started according to the contents of S1 to S9.

[0061] S11, construction of the culvert inlet and outlet: after the installation of the steel corrugated pipe culvert is completed, the bottom base concrete of the culvert outlet is constructed, and the wall body and the roof concrete are poured after the embankment is stable.

[0062] Through the segmented construction and the installation of the steel corrugated pipe segments from the middle to both sides, the construction process is more orderly and continuous, and the phenomena such as idling and waiting are avoided, thereby improving the overall construction efficiency, enabling the problems in the construction to be found and handled in a timely manner, reducing the construction risks, ensuring the engineering quality, better allocating resources, reducing the impact on the surrounding environment; through the multiple bearing capacity detection and the measurement and setting out procedures, the bearing capacity of the foundation pit is ensured to meet the design requirements, reliable basis is provided for the engineering design, the design scheme is more reasonable and economical, accurate positions and sizes are provided for the segmented construction of the pipe culvert, the number of adjustments in the construction process is reduced, the construction precision is ensured, the construction efficiency is improved, which is helpful for evaluating the safety performance of the engineering structure and ensuring the safety and reliability of the engineering in the use process; through the setting of the positioning steel reinforcement piles and the cement cushion blocks in the installation process of the steel corrugated pipe, the installation of the steel corrugated pipe is guided, the corrugated pipe is ensured to be accurately placed at the designed position, and the displacement of the corrugated pipe in the construction process is prevented, thereby improving the bearing capacity and stability of the culvert; through the reasonable steel corrugated pipe segment assembly process, the addition of the flat foamed sealing strips at the interfaces between the steel corrugated pipe segments, and the sealing treatment of the bolts and the connecting joints with hot melt asphalt, the rustproof galvanized layer of the segments is ensured not to be damaged when the bolts are tightened, rusting in the service life is prevented, the leakage of rainwater in the pipe to the outside of the pipe is reduced, the water outside the pipe does not enter the pipe, and the backfilling sand outside the pipe is prevented from being carried away by the water flow in the pipe in the long-term use, thereby hollowing out the embankment filling.

[0063] Specifically, as shown in Figure 1 and Figure 6 , the measurement and setting out includes: after the embankment is filled to the steel corrugated pipe culvert top center line elevation according to the design cross slope, the steel corrugated pipe culvert construction is performed; on the existing embankment top surface, the culvert axis is set out according to the design documents, and the width and elevation of the embankment surface are measured along the axis.

[0064] like Figure 1 , Figure 2 and Figure 6 As shown, the excavation of the foundation pit includes: excavating the foundation pit on the top surface of the existing roadbed according to the design culvert bottom elevation and the measurement results of the construction site, based on the width, height and slope of the excavation soil; excavating to the design elevation of the foundation, leveling the foundation pit, and removing waste, vegetation and loose parts from the foundation.

[0065] Preferably, the slope of the foundation pit is 1:0.75.

[0066] Preferably, the width of the foundation pit is ≥2 times the diameter of the corrugated steel pipe, ensuring that the working area on one side outside the corrugated steel pipe is ≥1m.

[0067] like Figure 1 and Figure 6 As shown, the bearing capacity test includes: compacting the excavated base with a heavy roller and testing the bearing capacity of the base; if the bearing capacity is not met, tamping is used to improve the bearing capacity of the base until it meets the design requirements.

[0068] like Figure 1 and Figure 6 As shown, the construction of the culvert foundation gravel layer includes: filling two layers of permeable granular materials such as gravel or graded crushed stone at the bottom of the foundation pit; setting the bottom of the foundation pit with a steel corrugated pipe with an axial pre-camber of 0.3% to 1.0% of the pipe length, and the maximum pre-camber should be set at the center of the route.

[0069] Preferably, the thickness of each layer of the filling layer 2 is 25~30cm.

[0070] Preferably, when laying two layers of gravel at the bottom of the foundation pit, after completing the first layer of compaction and obtaining the loose thickness and compaction thickness data, the loose thickness of the second layer is strictly controlled to ensure that the longitudinal slope is consistent after compaction and is not higher than the designed longitudinal slope. If it is inconsistent with the designed longitudinal slope, the elevation measured by the secondary measurement and layout steps is fully utilized to raise or lower the overall elevation to ensure the longitudinal slope of the culvert axis.

[0071] like Figure 1 and Figure 6 As shown, the secondary bearing capacity test includes: using a heavy roller to compact the fill layer of gravel soil in layers and conducting bearing capacity tests. If the bearing capacity is not met, tamping is used to improve the foundation bearing capacity until it meets the design requirements.

[0072] like Figure 1 and Figure 6As shown, the secondary measurement lofting includes: lofting according to the culvert design axis, positioning and numbering steel reinforcement piles every 5m, the steel reinforcement piles are not exposed and are marked with red paint; after completing the axis lofting, the height of each steel reinforcement pile is measured by using a level, and the data of the steel corrugated pipe to be adjusted at the position of each pile is calculated according to the longitudinal slope of the pipe culvert axis.

[0073] As shown in the figure, Figures 1 to 7 The steel corrugated pipe installation includes the following steps:

[0074] S701: According to the calculation data of S6, the position of the steel corrugated pipe installation axis is determined, and the steel corrugated pipe installation starts at the center position of the corresponding subframe construction surface; each section of the steel corrugated pipe includes three pipe pieces, the first steel corrugated pipe piece 11 is laid, the quarter position of the pipe piece coincides with the culvert axis, the second steel corrugated pipe piece 12 and the third steel corrugated pipe piece 13 are successively assembled, the top side is folded and preliminarily fixed with bolts, and the assembly of the first section is completed; a cement cushion 4 for supporting and positioning the corrugated pipe is arranged at the bottom of the culvert during installation;

[0075] Preferably, the two ends of the steel corrugated pipe piece at the top are outside the connecting port, and the two ends of the steel corrugated pipe piece at the bottom of the foundation pit are inside the connecting port;

[0076] Preferably, before installing the bolts, the first gasket 6 and the second gasket 7 are preferentially installed to ensure that the galvanized rust-proof layer of the steel corrugated pipe is not damaged during tightening of the bolts;

[0077] S702: From the first section, the second section is installed in two directions respectively; the longitudinal joints of the pipe pieces are staggered by half, the first steel corrugated pipe piece 11 and the second steel corrugated pipe piece 12 are connected to the first steel corrugated pipe piece 11 of the first section by using bolts, and after all the bolts are preliminarily fixed, the third steel corrugated pipe piece 13 is connected to the second section, and the bolts are preliminarily fixed;

[0078] Preferably, when assembling the pipe pieces, the bolts are fixed twice to fully utilize the space between the bolt holes and the screw rods to adjust the positioning of the pipe pieces; at the same time, after the next ring pipe piece is installed, the bolts of the upper ring pipe piece are fixed again to prevent deformation, which facilitates the installation and positioning of the next cycle pipe piece;

[0079] S703: The center line and elevation of the unadjusted steel corrugated pipe culvert are adjusted to the design requirements by using the prefabricated cement cushion 4, and the subsequent steel corrugated pipe pieces are installed in the method of S701 and S702, the steel corrugated pipe is assembled along the pipe culvert axis, and is adjusted to meet the design axis and longitudinal slope requirements;

[0080] Preferably, when assembling longitudinally, the upstream inlet pipe section end should be placed outside the connecting port of the downstream outlet pipe section, and should not be placed reversely;

[0081] S704: In the construction process of the culvert inlet and outlet pipe piece, when the axis of the pipe culvert is orthogonal to the route, the exposed surface of the culvert pipe at the inlet and outlet is consistent with the route; when the axis of the pipe culvert is oblique to the route, the manufacturer is submitted in advance to process and make according to the oblique angle, and the trial assembly is carried out at the factory; according to the import and export number, the site is directly assembled;

[0082] S705: After the steel corrugated pipe is installed and the axis and longitudinal slope are adjusted, all bolts are fixed again to ensure that the torsion force meets the design requirements.

[0083] As shown in Figure 1 and Figure 6 , the sealing and corrosion prevention treatment includes: adding a flat foamed sealing strip at the interface between the steel corrugated pipe pieces, and sealing the bolts and the connecting joints with hot melt asphalt; all the inside and outside of the steel corrugated pipe piece are subjected to corrosion prevention treatment by spraying emulsified asphalt twice; the damaged points of the corrosion prevention layer on the inside and outside surfaces of the steel corrugated pipe culvert should be cleaned and rusted before being treated by spraying zinc, spraying emulsified asphalt and the like.

[0084] Preferably, the sealing strip is a high-temperature-resistant and anti-aging silica gel sealing strip.

[0085] Preferably, the sealing strip is 4-6mm thick, 10-20mm wide, and the length is consistent with the overlapping length between the pipe pieces.

[0086] Preferably, the melting temperature of the hot melt asphalt is 130-150°C, the viscosity thereof in liquid state is 10-30Pa·s, and the hardness thereof after solidification is 60-80 of Shore A hardness.

[0087] As shown in Figures 1 to 8 , the culvert backfilling includes the following steps:

[0088] S901: Use sand and gravel soil, natural sand, foamed light soil and the like as filling materials, and symmetrically alternate on both sides of the foundation pit, lay and compact layer by layer; when the culvert backfilling layer 3 is constructed from the first layer to the third layer, the wedge-shaped area of the pipe culvert and the bottom of the foundation pit is compacted by vertical ramming; after the natural sand is compacted to the bottom of the culvert by logs, the sand and gravel soil is laid on the outside of the foundation pit and compacted by a small rammer, and the backfilling compactness should be ≥96%; after completion, the natural sand backfilling of the foundation pit is supplemented by water compaction method to ensure that the wedge-shaped area of the pipe culvert and the bottom of the foundation pit has a certain compactness;

[0089] Preferably, the loose laying thickness of each layer is 20-25cm, and the compacted thickness is 18-20cm;

[0090] S902: When the subsequent 4th layer to the 13th layer backfill layer 3 of the culvert is constructed in sequence, small compaction machinery or ramming tools are used for operation; when filling below the culvert centerline position, after each layer of compaction is completed, the wedge-shaped area of the pipe culvert and the bottom of the foundation pit is supplemented by using water compaction method;

[0091] S903: When the steel corrugated pipe culvert foundation pit is filled in layers on both sides, the operation direction of the ramming machinery is consistent with the direction of the culvert axis, and the same number on both sides is alternately compacted, and then the next layer of filling is carried out after compaction; when the filling at the top of the steel corrugated pipe culvert is compacted, the operation direction of the compaction or ramming machinery should be perpendicular to the length direction of the steel corrugated pipe culvert.

[0092] As shown in Figure 1 and Figure 6 , the conversion working surface includes: after the construction of 2 / 3 of the steel corrugated pipe culvert is completed, the construction of 2 / 3 of the roadbed filling is started, and the construction of 1 / 3 of the roadbed section steel corrugated pipe culvert is started according to the working contents of S1 to S9, until the culvert backfill is completed, and the construction of the entire super-long culvert is completed.

[0093] As shown in Figure 1 and Figure 6 , the culvert inlet and outlet construction includes: after the steel corrugated pipe culvert is installed, only the bottom base concrete at the culvert outlet is constructed, and the wall body concrete is not constructed, and after the roadbed is continuously filled and the roadbed is preliminarily stabilized for 2 months, the wall body and the cap concrete are poured.

[0094] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A construction method of high fill super long split assembled steel corrugated pipe culvert, characterized in that, It comprises the following steps: S1, measuring the line: on the existing roadbed surface, the roadbed filling and culvert axis lofting are carried out in sections, and the width and elevation of the roadbed surface are measured along the axis; S2, foundation pit excavation: according to the design culvert bottom elevation and construction site measurement results, the existing roadbed top surface is excavated to form a foundation pit; S3, bearing capacity detection: the excavated foundation is rolled by a heavy roller, and the bearing capacity of the foundation is detected; S4, culvert foundation gravel layer construction: two layers of sand and gravel or graded gravel and other water-permeable granular materials are filled at the bottom of the foundation pit, and a steel corrugated pipe is provided at the bottom of the foundation pit to provide axial pre-arch; S5, secondary bearing capacity detection: the sand and gravel soil is filled by layering and rolling by a heavy roller, and the bearing capacity is detected; S6, secondary measurement lofting: according to the culvert design axis lofting, steel reinforcement piles are positioned and numbered at intervals of 4-6m, and the elevation of the steel reinforcement piles is measured by using a level; S7, steel corrugated pipe installation: the prefabricated steel corrugated pipe is placed in the foundation pit, and the middle part is simultaneously assembled to the two sides, and a cement cushion (4) is placed at the bottom of the culvert pipe to support and position the steel corrugated pipe; S8, sealing and corrosion prevention treatment: flat foaming sealing strips are added between the joints of the steel corrugated pipe, and hot-melt asphalt is used to seal the bolts and connecting joints; two layers of emulsified asphalt are sprayed to prevent corrosion inside and outside the steel corrugated pipe; S9, backfilling of culvert: sand and gravel soil, foam light soil and other filling materials are used to symmetrically and alternately backfill the culvert on both sides of the foundation pit; S10, conversion of working face: after 2 / 3 of the steel corrugated pipe culvert construction is completed, 2 / 3 of the roadbed filling construction is started, and 1 / 3 of the roadbed section steel corrugated pipe culvert construction is started according to S1-S9; S11, culvert inlet and outlet construction: after the steel corrugated pipe culvert is installed, the bottom base concrete of the culvert outlet is constructed, and the wall body and roof concrete is poured after the roadbed is stable.

2. The construction method of a high-filled super-long split assembled steel corrugated pipe culvert according to claim 1, characterized in that, The S7 comprises the following steps: S701: start steel corrugated pipe installation at the center of the corresponding section construction surface, each section of steel corrugated pipe includes three pipe pieces, when laying the first steel corrugated pipe piece (11), one fourth of the pipe piece is consistent with the culvert axis, the second steel corrugated pipe piece (12) and the third steel corrugated pipe piece (13) are sequentially assembled, and are preliminarily fixed by bolts; a cement cushion (4) is provided at the bottom of the culvert to support and position the corrugated pipe; S702: from the first section, the second section is installed in two directions respectively; the longitudinal joints of the pipe pieces are staggered by half; the first steel corrugated pipe piece (11) and the second steel corrugated pipe piece (12) are connected to the first steel corrugated pipe piece (11) of the first section by bolts, after all the bolts are preliminarily fixed, the third steel corrugated pipe piece (13) is connected to the second section, and the bolts are preliminarily fixed; S703: the precast cement cushion (4) is used to adjust the center line and elevation of the steel corrugated pipe culvert to the design requirements, and the subsequent steel corrugated pipe pieces are installed according to the method of S701 and S702, the steel corrugated pipe is assembled along the culvert axis, and is adjusted to meet the design axis and longitudinal slope requirements; S704: In the construction process of the culvert inlet and outlet pipe piece, when the axis of the pipe culvert is orthogonal to the route, the exposed surface of the culvert pipe at the inlet and outlet is consistent with the route; when the axis of the pipe culvert is oblique to the route, the manufacturer is submitted in advance to process and make according to the oblique angle, and the trial assembly is carried out at the factory; according to the import and export number, the site is directly assembled; S705: After the steel corrugated pipe is installed and the axis and longitudinal slope are adjusted, all the bolts are fixed again to ensure that the torsion reaches the design requirement.

3. The construction method of a high-filled super-long split assembling steel corrugated pipe culvert according to claim 2, characterized in that, When the steel corrugated pipe is installed, the two ends of the steel corrugated pipe at the top are outside the connecting port, and the two ends of the steel corrugated pipe at the bottom of the foundation pit are inside the connecting port.

4. The construction method of a high-filled super-long split assembling steel corrugated pipe culvert according to claim 2, characterized in that, When the steel corrugated pipe is installed, the first gasket (6) and the second gasket (7) are preferentially installed before the installation of the bolt.

5. The construction method of a high-filled super-long split-piece assembled steel corrugated pipe culvert according to any one of claims 1-4, characterized in that, When the steel corrugated pipe is assembled in the longitudinal direction, the upstream inlet pipe joint end should be placed outside the connecting port of the downstream outlet pipe joint, and should not be placed reversely.

6. The construction method of a high-filled super-long split-piece assembled steel corrugated pipe culvert according to any one of claims 1-4, characterized in that, The slope line of the foundation pit is 1:0.75, and the width of the foundation pit is greater than or equal to 2 times the diameter of the steel corrugated pipe, so as to ensure that the working site outside the single side of the steel corrugated pipe is greater than or equal to 1m.

7. The construction method of a high-filled super-long split-piece assembled steel corrugated pipe culvert according to any one of claims 1-4, characterized in that, The thickness of each layer of the filling layer (2) is 25-30cm.

8. The construction method of a high-filled super-long split assembling steel corrugated pipe culvert according to any one of claims 1-4, characterized in that, The sealing strip is a high-temperature-resistant and anti-aging silica gel sealing strip; the sealing strip has a thickness of 4-6mm, a width of 10-20mm, and a length consistent with the overlapping length between pipe pieces.

9. The construction method of a high-filled super-long split-piece assembled steel corrugated pipe culvert according to any one of claims 1-4, characterized in that, The S9 comprises the following steps: S901: The filling material such as gravel soil, natural sand, and foamed lightweight soil is used to simultaneously and symmetrically alternate on both sides of the foundation pit, and is layered and compacted; when the culvert backfill layer (3) of the first layer to the third layer is constructed, the wedge-shaped area of the foundation pit bottom and the pipe culvert with the foundation pit bottom is compacted by using a vertical rammer; after completion, the natural sand for backfilling the foundation pit is supplemented by using a water compaction method; S902: When the culvert backfill layer (3) of the subsequent fourth layer to the thirteenth layer is sequentially constructed, small compaction machinery or ramming tools are used for operation; when the filling is performed below the center line position of the culvert, after each layer is compacted, the wedge-shaped area of the pipe culvert and the foundation pit bottom is supplemented by using a water compaction method; S903: When the foundation pit on both sides of the steel corrugated pipe culvert is layered and filled, the operation direction of the ramming machinery is consistent with the direction of the culvert axis, and the same numbered sides on both sides are alternately compacted, and the next layer is filled after compaction; when the filling at the top of the steel corrugated pipe culvert is compacted, the operation direction of the compaction or ramming machinery should be perpendicular to the length direction of the steel corrugated pipe culvert.

10. The construction method of a high-filled super-long split assembling steel corrugated pipe culvert according to claim 9, characterized in that, The loose laying thickness of the culvert backfill layer (3) is 20-25cm, and the compacted thickness is 18-20cm.

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