Supporting structure and construction method for rapid first-aid repair of landslide roadbed slope

Abstract

The invention relates to a supporting structure and a construction method for rapid first-aid repair of a slump roadbed slope, and belongs to the field of first-aid repair of roadbed engineering. The supporting structure is a pile-slab supporting structure and is composed of steel piles and hollow prefabricated partition plates; each steel pile comprises a steel pile bottom block section, a steel pile standard block section, a steel pile splicing bolt and a steel pile splicing screw rod; each of the steel pile bottom block section and the steel pile standard block section comprises a plurality of steel pile splicing sinking grooves formed in the top of the steel pile bottom block section and the steel pile standard block section; the open-web type prefabricated partition plate comprises a partition plate bottom block section, a partition plate standard block section, a partition plate splicing plug pin and a partition plate splicing screw rod. The partition plate bottom block section and the partition plate standard block section each comprise a plurality of partition plate splicing sinking grooves formed in the top of the partition plate bottom block section and the top of the partition plate standard block section. The pile plate supporting structure has the advantages of being easy to construct, efficient, convenient and fast to use, high in strength, good in universality, safe, reliable, wide in application range, capable of saving energy, economical and the like, and can be used for achieving rapid recovery of damaged road traffic and providing a closed, efficient and safe construction environment for rapid rush repair work of a slump roadbed slope.

Description

Technical Field

[0001] The invention belongs to the field of emergency repair of roadbed engineering, and in particular relates to a supporting structure and a construction method for rapid emergency repair of collapsed roadbed slope. Background Art

[0002] my country has many mountainous areas with complex terrains. A large number of roads are built on the mountains, forming a large number of roadbed slopes. Under the influence of extreme weather or human disturbance, the stability of roadbed slopes will decrease sharply, and even collapse as a whole, leading to traffic interruption. At the same time, roadbed slope collapse not only threatens the safety of people's lives and property, but also hinders the normal operation of social life and production. In order to reduce the serious losses caused by roadbed slope collapse, it is necessary to develop corresponding fast and efficient emergency repair support structures for collapsed roadbed slopes and safe and simple construction methods.

[0003] At present, structures such as anti-slide piles, prestressed anchor frame beams and retaining walls can be used to treat landslides on the roadbed slopes. These structures have strong support capabilities, but the large-scale components and on-site casting characteristics make their construction process complicated and the construction period long, making it difficult to meet the requirements for rapid repair of landslides on the roadbed slopes. In addition, these structures have high construction costs, and most of them involve large-scale excavation of landslides on the roadbed slopes, requiring a lot of material and human resources, which is not conducive to maximizing the reduction of losses caused by landslides on the roadbed slopes. Therefore, it is difficult to achieve rapid, simple, safe, efficient, energy-saving and low-cost repair and structural reinforcement of landslides on the roadbed slopes, and it is not easy to achieve the purpose of rapid repair of damaged roads and rapid restoration of traffic.

[0004] Chinese invention patent application CN201910650107.3 discloses a combined anchor-type shoulder retaining wall and its construction method, which is used to solve the problem that the existing design of shoulder retaining wall in some working conditions is prone to rock landslides, and the process is cumbersome and the construction period is long. The technical solution adopted is: the combined anchor-type shoulder retaining wall is composed of at least two retaining wall unit modules sequentially combined along the route direction, and the retaining wall unit includes an outer longitudinal reinforced concrete precast plate located on the slope, an inner longitudinal reinforced concrete precast plate, and a transverse reinforced concrete precast plate; the inner and outer longitudinal reinforced concrete precast plates are connected by tension anchor rods, and the transverse reinforced concrete precast plates are connected by connecting anchor rods; the three form a concrete pouring area, and the outer longitudinal reinforced concrete precast plate is also provided with a prestressed anchor cable. The invention is modularly manufactured, with fewer construction processes, short construction period, and high efficiency, providing a reference for the design and construction of shoulder retaining walls in emergency repair projects and projects with tight construction periods. Although the invention can effectively protect the slope, the structure is not prefabricated and must be constructed on site, which places high demands on the on-site safe construction environment and makes it difficult to quickly repair the collapsed roadbed slope.

[0005] Chinese invention patent application CN202011420408.6 provides a landslide belt pile-board integrated protection construction system and construction method, by setting up a foundation-shaped template, a slide-type leveling and repairing mold and a board surface green plant hanging groove device; a foundation-shaped template is set up between adjacent anti-sliding piles, concrete is poured in the space enclosed by the foundation-shaped template and the anti-sliding pile to form a retaining board foundation, the retaining board is hoisted layer by layer on the retaining board foundation, the retaining board is connected with the anti-sliding pile with a reserved anchor rod, after the retaining board is hoisted, the slide-type leveling and repairing mold is installed using the drainage hole reserved in the retaining board, the anti-sliding pile facade is leveled by the slide-type leveling and repairing mold, and the board surface green plant hanging groove is installed using the hook set on the outer facade of the retaining board. The landslide belt pile-board integrated protection system involved in the invention adopts a construction method of first pouring anti-sliding piles and then excavating and repairing, which effectively reduces the safety risk of landslide belt protection construction, has significant technical benefits, high safety, good ecological effects, and outstanding economic and technical benefits. However, the invention requires anti-slip piles in advance when it is implemented, which makes it unsuitable for emergency repair of collapsed roadbed slopes; at the same time, structures such as the retaining plate structure foundation need to be cast in situ, making it difficult to achieve the purpose of rapid support; in addition, the retaining plates are constructed in a stacked manner from bottom to top, and the two sides of the retaining plates are connected to the rear side of the anti-slip piles by anchor rods. This method will bring many construction inconveniences in the emergency repair project, and it is impossible to carry out sequential construction from bottom to top in the collapsed slope that has not been unloaded and cleaned.

[0006] Chinese utility model patent CN202223142753.5 discloses a collapse protection and slope protection structure, including cement precast piles, cement precast panels and cement precast blocks, and also including embedded steel bars and steel bar sockets. Cement precast panels are vertically arranged at equal distances between the backs of the cement precast piles, cement precast blocks are arranged at equal distances on the tops of the cement precast piles, and the two ends of the cement precast blocks are respectively erected on the corresponding cement precast piles, and the corners of the cement precast piles are respectively vertically embedded with embedded steel bars, and the two ends of the bottom of the cement precast blocks are respectively provided with steel bar sockets corresponding to the embedded steel bars. This application can effectively protect the river bank slope through the layout of a simple cement lap binding structure on both sides of the river, avoid soil erosion, and effectively solve the collapse phenomenon caused by the river bank soil being carried and washed away by the river flow, which affects the foundation safety of roads and houses on both sides. However, the length of the pile of the utility model patent is limited, and it is difficult to effectively treat medium and large landslides; at the same time, the pile plates are connected by binding, and the coordinated anti-slip effect of the pile plates is poor, which causes inconvenience in construction and is not conducive to the pile plates to penetrate deep into the sliding body for construction.

[0007] Therefore, the art still needs a new support structure and construction method for rapid repair of collapsed roadbed slopes. Summary of the invention

[0008] Therefore, the present invention first provides a support structure for rapid repair of a collapsed roadbed slope, wherein the support structure is a pile-plate support structure and is composed of a steel pile (12) and a hollow prefabricated partition (13);

[0009] The steel pile (12) comprises a steel pile bottom block section (14), a steel pile standard block section (15), a steel pile splicing pin (17), and a steel pile splicing screw (18). The steel pile bottom block section (14) and the steel pile standard block section (15) both comprise a plurality of steel pile splicing sinks (16) arranged at the top thereof and used to match with a plurality of steel pile splicing pins (17). The steel pile bottom block section (14) and the steel pile standard block section (15) both comprise two steel pile wing plates (121) and a steel pile web plate (122). The two steel pile wing plates (121) are arranged in parallel and together with the steel pile web plate (122) form an I-shaped structure. Embedding grooves (123) symmetrically arranged on the left and right sides are formed between the steel pile webs (122); the lower end of the steel pile bottom block section (14) is provided with a sharp structure (141) for easy wedging into the soil layer, and the lower end of the steel pile standard block section (15) is provided with the steel pile splicing pin (17); steel pile screw holes (124) are provided at the steel pile wing plate (121) at the top of the steel pile bottom block section (14), at the steel pile wing plate (121) at the top of the steel pile standard block section (15), and at the steel pile splicing pin (17) at the bottom of the steel pile standard block section (15), and the steel pile screw holes (124) are used for the steel pile splicing screw (18) to pass through;

[0010] The hollow prefabricated partition (13) comprises a partition bottom block (20), a partition standard block (21), a partition splicing pin (23), and a partition splicing screw (25). The partition bottom block (20) and the partition standard block (21) both comprise a plurality of partition splicing sinks (22) arranged at the top thereof and used to match with a plurality of partition splicing pins (23). The partition bottom block (20) and the partition standard block (21) both comprise a partition web (131) enclosing a rectangular structure and partition wing plates (132) arranged on the left and right sides of the partition web (131). The partition web (131) encloses a hollow structure (133) of the partition. The partition wing plates (132) are used to be clamped into the steel piles (12). Embedded in the groove (123); the lower end of the partition bottom block section (20) is provided with a gradual structure (201) that is convenient for wedging into the soil layer, and the lower end of the partition standard block section (21) is provided with the partition splicing pin (23); partition screw holes (134) are provided at the partition web (131) at the top of the partition bottom block section (20), at the partition web (131) at the top of the partition standard block section (21), and at the partition splicing pin (23) at the bottom of the partition standard block section (21), and the partition screw holes (134) are used for the partition splicing screws (25) to pass through; and a plurality of pre-buried drainage holes (24) are provided in the thickness direction of the partition bottom block section (20) and the partition standard block section (21).

[0011] In a specific embodiment, the steel pile (12) further comprises a short steel column (19), wherein the short steel column (19) is used to hammer the steel pile bottom block section (14) and the steel pile standard block section (15) into the soil layer during steel pile construction, and a steel pile splicing pin (17) is arranged at the lower end of the short steel column (19), a handle (191) is arranged at the top of the short steel column (19), and an embedding groove (123) is arranged on the side of the short steel column (19); preferably, the short steel column (19) is a U-shaped short steel column with an embedding groove (123) only on one side.

[0012] In a specific embodiment, the hollow prefabricated partition (13) further includes a cap plate (26), and the cap plate (26) is used to hammer the partition bottom block section (20) and the partition standard block section (21) into the soil layer during the construction of the hollow prefabricated partition (13). The lower end of the cap plate (26) is provided with a partition splicing pin (23), the top of the cap plate (26) is provided with a handle (261), and the side of the cap plate (26) is provided with a cap plate wing plate (262) that matches the embedding groove (123) of the steel pile (12).

[0013] The present invention also provides a construction method for rapid repair of collapsed roadbed slopes, wherein the pile-sheet support structure as described above is used; and the construction method comprises the following steps:

[0014] S1: Construction starts from the shoulders of the stable sections on both sides of the collapsed roadbed slope and closes symmetrically toward the middle of the damaged section. There is no need to unload and clean the sliding body in the collapsed roadbed slope in advance; and steel pile construction is carried out first;

[0015] S2: After the construction of two adjacent steel piles is completed, the hollow prefabricated partition is constructed;

[0016] S3: Repeat steps S1 and S2 until the pile-sheet support structure is closed, and then backfill the original soil of the slope to the initial elevation.

[0017] In a specific implementation, step S1 includes the following steps:

[0018] S1-1: First, position the bottom block of the steel pile at the predetermined position, and then embed the short steel column into the bottom block of the steel pile. Hammer the steel pile vertically, and leave 30 to 100 cm of the top of the bottom block of the steel pile without embedding it into the soil to prepare for the construction of the first standard block of the steel pile, and then remove the short steel column.

[0019] S1-2: Then embed the first steel pile standard block section downward into the bottom block section of the steel pile, and lock the upper and lower blocks with steel pile splicing screws, and embed the short steel column downward into the steel pile standard block section, and hammer the steel pile in the vertical direction. Leave a height of 30 to 100 cm on the upper part of the steel pile standard block section without embedding it into the soil to prepare for the construction of the next steel pile standard block section, and remove the short steel column; according to the set pile length, splice one or multiple steel pile standard blocks in sequence according to the method in this step.

[0020] In a specific implementation, step S2 includes the following steps:

[0021] S2-1: After completing the construction of two adjacent steel piles, first install short steel columns on the tops of the two adjacent steel piles; use the embedding grooves of the short steel columns to locate the bottom block section of the partition, and embed the cap plate downward into the bottom block section of the partition, and hammer it into the partition in the vertical direction. Leave a height of 30 to 100 cm on the upper part of the bottom block section of the partition without embedding it in the short steel columns, in preparation for the construction of the first standard block section of the partition, and then remove the cap plate;

[0022] S2-2: Then embed the first partition standard block section downward into the partition bottom block section, and lock the upper and lower blocks with the partition splicing screws, and embed the cap plate downward into the partition standard block section, and hammer it into the partition in the vertical direction. Leave a height of 30 to 100 cm on the upper part of the partition standard block section and do not embed it into the short steel column to prepare for the construction of the next partition standard block section, and remove the cap plate; according to the set board length, splice one or multiple partition standard block sections in sequence according to the method of this step;

[0023] S2-3: After the construction of the hollow prefabricated partition is completed, the short steel columns on the top of the steel piles on both sides are removed to pour concrete to fill the hollow prefabricated partition.

[0024] The pile-sheet support structure of the present invention has the characteristics of simple construction, high efficiency and convenience, high strength, good versatility, safety and reliability, wide application range, energy saving and economy. It can not only be used to achieve rapid restoration of damaged road traffic, but also provide a closed, efficient and safe construction environment for the rapid repair of collapsed roadbed slopes, which is very beneficial to the emergency treatment of collapsed roadbed slopes; at the same time, its own structure is reliable and has high strength, which can serve as a reliable guarantee for the subsequent long-term normal use of the collapsed roadbed slopes.

[0025] In the present invention, the length of the pile is extended by splicing, so that the length of the pile is no longer limited; the pile plate is embedded in the present invention, and its reliability and construction convenience are significantly better than the binding method in the prior art.

[0026] The construction method of the present invention can achieve the purpose of fast, simple, safe, efficient, energy-saving and low-cost repair and structural reinforcement of collapsed roadbed slopes, improve the efficiency of emergency repair of damaged roads, and thus achieve the purpose of quickly restoring traffic operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional schematic diagram of the pile-sheet support structure of the present invention for repairing the collapsed roadbed slope.

[0028] Figure 2 It is a two-dimensional schematic diagram of the pile-sheet support structure of the present invention for repairing the collapsed roadbed slope.

[0029] Figure 3 It is a partial schematic diagram of the pile-sheet supporting structure of the present invention.

[0030] Figure 4 It is a basic structural diagram of the steel pile of the present invention; Figure a is a schematic diagram of the bottom block section of the steel pile, Figure b is a horizontal cross-sectional schematic diagram of the bottom block section of the steel pile and the standard block section of the steel pile, Figure c is a schematic diagram of the standard block section of the steel pile, Figure d is a schematic diagram of the steel pile splicing pin, Figure e is a schematic diagram of the steel pile splicing screw, and Figure f is a schematic diagram of the short steel column.

[0031] Figure 5It is a basic structural diagram of some hollow prefabricated partitions of the present invention, wherein Figure a is a schematic diagram of the partition bottom block section, Figure b is a schematic diagram of the partition standard block section, and Figure c is a horizontal cross-sectional schematic diagram of the partition bottom block section and the partition standard block section.

[0032] Figure 6 This is another basic structural diagram of the hollow prefabricated partition of the present invention. Figure a is a schematic diagram of the partition splicing pin, Figure b is a schematic diagram of the partition splicing screw, Figure c is a schematic diagram of the hole filling structure of the embedded drainage hole, and Figure d is a schematic diagram of the cap plate.

[0033] Figure 7 It is a schematic diagram of the steel pile splicing construction and splicing process of the present invention.

[0034] Figure 8 It is a schematic diagram of the construction and splicing process of the hollow prefabricated partition of the present invention.

[0035] Fig. 9 It is a schematic diagram of the construction process of the pile-sheet supporting structure of the present invention.

[0036] Among them: 1. Slope of landslide embankment; 2. Pile-board support structure; 3. Road surface; 4. Shoulder; 5. Slope surface; 6. Slope bottom surface; 7. Sliding body; 8. Sliding surface; 9. Lower stable soil layer; 10. Stable section; 11. Destruction section; 12. Steel piles; 13. Hollow prefabricated partition; 14. Bottom block section of steel piles; 15. Standard block section of steel piles; 16. Steel pile splicing sink trough; 17. Steel pile splicing pin; 18. Steel pile splicing screw; 19. Short steel column; 20. Bottom block section of partition; 21. Standard block section of partition; 22. Plate splicing sink groove; 23, partition splicing pin; 24, embedded drainage hole; 25, partition splicing screw; 26, cap plate; 121, steel pile wing plate; 122, steel pile web plate; 123, embedded groove; 124, steel pile screw hole; 131, partition web plate; 132, partition wing plate; 133, hollow structure; 134, partition screw hole; 141, sharp structure; 191, handle; 201, gradient structure; 241, sand and gravel material; 242, wire filter; 261, handle; 262, cap plate wing plate. DETAILED DESCRIPTION

[0037] To this end, the present invention designs a pile-board support structure composed of steel piles and hollow prefabricated partitions, and establishes a systematic and effective construction method. The structure is simple to construct, efficient and convenient, has high strength, good versatility, safety and reliability, a wide range of applications, and is energy-saving and economical, which is very beneficial for the emergency treatment of landslide roadbed slopes.

[0038] In order to solve the above technical method problems, the technical solution proposed by the present invention is a support structure and a construction method for rapid repair of collapsed roadbed slopes, wherein the support structure is a pile-board support structure.

[0039] Figures 1 to 3 Schematic diagram of the pile-sheet support structure in the present invention. Figure 1 The middle arrow points to the direction of the landslide embankment slope; Figure 2 The short distance represents the embedded length, and the long distance represents the pile length.

[0040] The characteristics of pile-sheet support structure are:

[0041] (1.1) The pile-sheet support structure consists of two parts: steel piles and hollow prefabricated diaphragms. The hollow prefabricated diaphragms are connected to the steel piles in an embedded manner to synergistically play the role of anti-slip and support, thereby achieving rapid repair of collapsed roadbed slopes in a large area;

[0042] (1.2) The pile-sheet support structure can be arranged in multiple rows according to demand, with its top flush with the road surface, and preferably arranged on the shoulder, so as to facilitate the rapid filling and repair of the road surface part of the landslide roadbed slope, and also facilitate the safe cleaning and restoration of the slope surface and bottom surface of the landslide roadbed slope.

[0043] (1.3) The pile-sheet support structure is arranged parallel to the direction of the collapsed roadbed slope and is linearly distributed in space, so as to maximize the support and retaining functions of the pile-sheet support structure and reduce the construction difficulty of the emergency repair work of the collapsed roadbed slope to a certain extent.

[0044] Figure 4 It is a schematic diagram of the structure of the steel pile in the present invention.

[0045] Steel pile features:

[0046] (2.1) The steel pile is a steel structure with an "I"-shaped horizontal section, consisting of a web and a wing. The thickness of the web and wing is about 14 cm. An embedding groove is provided between the web and the wing to facilitate embedding with the hollow prefabricated partition. In addition, the steel pile has a large bending stiffness as a whole and can be quickly inserted into the slope soil by hammering.

[0047] (2.2) Steel piles should pass through the middle sliding surface of the landslide embankment slope and be embedded in the stable soil layer in the middle and lower part of the landslide embankment slope. The embedding length should be 1 / 3 to 1 / 2 of the pile length to facilitate the anti-sliding effect of the steel piles on the landslide embankment slope.

[0048] (2.3) The steel piles are designed in a segmented splicing mode, including bottom blocks and standard blocks, and each block is approximately 200cm long × 40cm wide × 40cm high, which can achieve modular and lightweight construction, reduce the dependence on large machinery and equipment during the repair process, minimize the demand for manpower and material resources, and further shorten the repair time;

[0049] (2.4) The bottom block of the steel pile is installed at the bottom of the pile. The lower part is a solid cone, which is convenient for hammering into the soil layer and reaching the designed depth quickly. The upper part is provided with a splicing sink for splicing with the standard block;

[0050] (2.5) Standard steel pile segments, which are used to extend the length of the pile. They are standard modular segments with joint pins at the bottom and joint grooves at the top. Multiple segments can be joined together continuously to achieve standardized steel pile construction and meet different design pile length requirements.

[0051] (2.6) Steel pile splicing pins, which are rectangular in shape and arranged on the wing plate in two rows, each row consisting of 3 pins, each pin has a length × width × height of approximately 30 cm × 6 cm × 6 cm, and in addition, a circular hollow hole with a diameter of 2 cm is provided in the middle of the pin for installing a splicing screw;

[0052] (2.7) Steel pile splicing sinks, corresponding to the splicing pins, are also rectangular and arranged on the wing plate in two rows, each row consisting of three sinks, and each sink has the same dimensions of length × width × height as the splicing pins. In addition, a through circular hollow hole is provided in the middle of the sink, which is consistent in position and size with the circular hollow hole in the middle of the pin, for installing the splicing screw, and can also be used for the lifting and splicing of the blocks during the construction process, that is, the circular hollow hole is used to pass a rope for lifting;

[0053] (2.8) The splicing screw in the steel pile has a diameter of about 2 cm and a length of about 40 cm. One end is a fixed end and the other end is a nut end, which is used to install the nut and thereby lock the various segments in the steel pile, thereby achieving an effective rigid connection between the various segments in the steel pile;

[0054] (2.9) When hammering steel piles, a short steel column is provided on the upper part. Its horizontal section is "U" shaped. The width and height are consistent with the sizes of each block in the steel pile. The length is about 50 cm (the length direction of the short steel column is in the vertical direction when in use). An embedding groove is provided on one side of the "U" shape, and a splicing pin is provided on the lower part. The positions, shapes and sizes of the two are exactly the same as the embedding groove and splicing pin of the steel pile. At the same time, considering the temporary use characteristics, no circular hollow hole is provided in the middle of the splicing pin of the short steel column. In addition, handles are provided on both sides of the top for easy installation and disassembly. The functions of the short steel column are, first, to increase the hammering area to ensure the stability of the hammering construction; second, to avoid directly hammering the blocks in the steel pile, thereby protecting the steel pile; third, the short steel column and the steel pile are provided with embedding grooves of the same shape and size, which are convenient for positioning and guiding the hollow prefabricated partition embedding construction.

[0055] Figures 5-6 It is a schematic diagram of the structure of the hollow prefabricated partition in the present invention.

[0056] The characteristics of hollow prefabricated partition are:

[0057] (3.1) The hollow prefabricated diaphragm is a steel structure, and the hollow in the middle can be filled by pouring concrete in the later stage. On the one hand, the prefabricated hollow steel structure is conducive to reducing the amount of steel used, saving costs, and facilitating rapid and lightweight construction. On the other hand, the later cast-in-place concrete can further improve the integrity and support capacity of the prefabricated transverse diaphragm;

[0058] (3.2) Hollow-type prefabricated diaphragm, with thinner wing plates on both sides and thicker hollow-type web plates in the middle, which are spindle-shaped in plane. The wing plates are matched with the embedding grooves of the steel piles in size and can be inserted into the embedding grooves of the steel piles, thereby connecting the prefabricated transverse diaphragm and the micro steel piles into a whole. The thickness of the wing plate wall is about 12 cm, and the thickness of the web plate wall is about 14 cm, which meets the strength requirements for hammering construction of the transverse diaphragm. In the present invention, the hollow-type prefabricated diaphragm is a hollow spindle-shaped prefabricated transverse diaphragm, and the spindle-shaped refers to the prefabricated plate being thick in the middle and thin on the left and right sides;

[0059] (3.3) The hollow prefabricated diaphragm mainly plays the role of retaining soil. It does not need to penetrate into the stable soil layer in the middle and lower part of the landslide roadbed slope. Its bottom only needs to reach 0.5m below the lower stable soil layer.

[0060] (3.4) The hollow prefabricated partition is designed by segmented splicing, including bottom blocks and standard blocks, and each block is about 200cm × 200cm × 40cm in length × width × height, which can realize modular and lightweight construction, improve construction flexibility, and reduce the restrictive impact of unfavorable construction environment on site;

[0061] (3.5) The bottom block of the diaphragm is arranged at the bottom end of the transverse diaphragm. The lower part is a solid cone, which is convenient for hammering into the soil layer and reaching the designed depth quickly. The upper part is provided with a splicing sink for splicing with the standard block;

[0062] (3.6) Standard block section of partition, which is used to extend the board height. It is a standard modular block section with a splicing pin at the bottom and a splicing groove at the top. Multiple blocks can be spliced ​​together continuously to achieve standardized construction of hollow prefabricated partitions and meet different design board height requirements;

[0063] (3.7) The splicing pins in the hollow prefabricated partition are rectangular in shape and arranged on the web in two rows. The length × width × height of the pins are all approximately 30 cm × 150 cm × 6 cm. In addition, a circular hollow hole with a diameter of 2 cm is provided in the middle of the pin for installing the splicing screw;

[0064] (3.8) The splicing grooves in the hollow prefabricated partitions are corresponding to the splicing pins and are also rectangular in shape. They are arranged on the webs in two rows that are almost full-length and are not connected at the ends. The length × width × height of each groove is the same as that of the splicing pins. In addition, a through circular hollow hole is provided in the middle of the groove, which is consistent in position and size with the circular hollow hole in the middle of the pin, for installing the splicing screw and can also be used for the hoisting and splicing of the blocks during the construction process, that is, the circular hollow hole is used to pass ropes for hoisting;

[0065] (3.9) The splicing screw in the hollow prefabricated partition has a diameter of about 2 cm and a length of about 174 cm. One end is a fixed end and the other end is a nut end, which is used to install the nut and thereby lock the blocks in the hollow prefabricated partition, thereby realizing an effective rigid connection between the blocks in the hollow prefabricated partition;

[0066] (3.10) Each hollow prefabricated partition is provided with 4 pre-buried drainage holes with a diameter of 5 cm, a length of 40 cm and a spacing of 100 cm. Each pre-buried drainage hole is filled with gravel material and steel wire filters are arranged on both sides. On the one hand, the groundwater inside the roadbed slope is effectively discharged, and on the other hand, the drainage channel is prevented from being blocked. Generally, a steel wire filter is fixed at one end of the pre-buried drainage hole, and then the hole is filled with gravel material, and then a steel wire filter is fixed at the other end.

[0067] (3.11) When the hollow prefabricated partition is hammered in, a cap plate is provided on the upper part. Its plane shape is consistent with that of the hollow prefabricated partition, but it is solid-core, and its length × width × height are approximately 15cm × 200cm × 40cm. A splicing pin is provided on the lower part, and the positions, shapes and sizes of the two are exactly the same as those of the partition splicing grooves. At the same time, considering the temporary use characteristics, no circular hollow hole is provided in the middle of the cap plate splicing pin. In addition, handles are provided on both sides of the top for easy installation and disassembly. The functions of the cap plate include: first, increasing the hammering area to ensure the stability of the hammering construction; second, avoiding direct hammering of the blocks in the hollow prefabricated partition, thereby protecting the hollow prefabricated partition.

[0068] Figure 7 The figure is a schematic diagram of the steel pile splicing construction in the present invention, wherein the five steps from left to right are: positioning the micro steel pile, embedding the U-shaped short steel column, hammering into the construction, removing the U-shaped short steel column, and splicing the next block segment.

[0069] The characteristics of the steel pile construction and splicing of the present invention are:

[0070] (4.1) Position the steel pile at the predetermined position and hammer it into the pile vertically, first the bottom block and then the standard block, and splice the standard block according to the set pile length;

[0071] (4.2) Before hammering the steel piles into each block, first embed the short steel columns into each block, and then hammer them in;

[0072] (4.3) When hammering steel piles into the soil, a 50cm height is reserved for the construction block without embedding it into the soil, so as to facilitate splicing with the next block;

[0073] (4.4) When splicing blocks, first remove the short steel column, then insert the splicing pin of the next block into the splicing groove of the construction block, and finally install and tighten the splicing screw.

[0074] Figure 8 The figure is a schematic diagram of the splicing construction of the hollow prefabricated partition in the present invention, which includes six steps: installing U-shaped short steel columns, positioning prefabricated partitions, installing cap plates, hammering construction, removing cap plates, and splicing the next block segment.

[0075] The characteristics of the construction and splicing of the hollow prefabricated partition board of the present invention are:

[0076] (5.1) After completing the construction of two adjacent steel piles, the construction of the hollow prefabricated partition can be carried out;

[0077] (5.2) Before the construction of the hollow prefabricated partition, short steel columns are installed on the top of the steel piles on both sides;

[0078] (5.3) Using the embedded grooves of the short steel columns, first locate the hollow prefabricated diaphragm, and then hammer it into the diaphragm in the vertical direction;

[0079] (5.4) When constructing the hollow prefabricated partition, the bottom block section is constructed first, followed by the standard block section, and the standard block sections are spliced ​​according to the set board length;

[0080] (5.5) When hammering in the hollow prefabricated partition, the cap plate is first embedded in the construction block (including the bottom block and the standard block). At the same time, a 50cm height is reserved for the construction block without embedding the short steel column to facilitate splicing with the next block;

[0081] (5.6) When splicing blocks, first remove the cap plate, then insert the splicing pin of the next block into the splicing groove of the construction block, and finally install and tighten the splicing screw;

[0082] (5.7) After the construction of the hollow prefabricated partition is completed, the short steel columns on the top of the steel piles on both sides are removed, and concrete is poured to fill the hollow prefabricated partition.

[0083] Fig. 9 The schematic diagram of the pile-sheet support structure construction in the present invention includes four steps: constructing two adjacent I-type micro steel columns, constructing hollow spindle-shaped prefabricated transverse diaphragms, repeating the above steps until the row-type pile-sheet support structure is closed, and backfilling the original soil of the slope to the initial elevation.

[0084] The characteristics of the pile-sheet support structure construction of the present invention are:

[0085] (6.1) The pile-sheet support structure starts from the shoulders of the stable sections on both sides of the collapsed roadbed slope and is constructed symmetrically toward the middle of the damaged section. There is no need to unload and clean the sliding body in the collapsed roadbed slope in advance.

[0086] (6.2) The steel piles are constructed first, followed by the hollow prefabricated partitions. The hollow prefabricated partitions must be constructed after the construction of two adjacent steel piles is completed;

[0087] (6.3) The completed pile-sheet support structure can be used as a support and fixing platform for the installation, positioning and hammering equipment required for the unfinished pile-sheet support structure;

[0088] (6.4) The pile-sheet support structure is constructed from the stable section of the landslide embankment slope to the damaged section of the landslide embankment slope. The steel piles in the stable section of the landslide embankment slope are shorter, while the steel piles in the damaged section of the landslide embankment slope are longer, which means that the hammering operation of the pile-sheet support structure in the early stage of construction has little disturbance to the surrounding soil. At the same time, although the hammering operation of the pile-sheet support structure in the later stage of construction has a greater disturbance to the surrounding soil, the pile-sheet support structure completed in the early stage of construction can play a restraining role on the surrounding soil.

[0089] (6.5) After the pile-sheet support structure is closed, the road surface part of the landslide embankment slope is backfilled with the original soil of the slope to the initial elevation to restore the road surface.

[0090] In the present invention, the steel pile is generally formed in one piece, wherein the steel pile joint pin is also formed in one piece at the bottom of the pile standard block section. The hollow prefabricated partition is also formed in one piece, and its structure is also a steel structure, wherein the partition joint pin is also formed in one piece at the bottom of the partition standard block section.

[0091] In the present invention, the short steel column and the cap plate are only used during the construction process, and can be used in other projects after the construction is completed. Because the short steel column is generally constructed on only one side during construction, and the other side has been completed or does not need to be constructed yet, the short steel column is generally "U"-shaped, that is, only one side of it has an embedding groove.

[0092] Example

[0093] A kind of Figures 1 to 9The support structure and construction method for the rapid repair of the collapsed roadbed slope shown in the figure are implemented on a residual soil slope with a slope height of about 20m and a slope angle of about 55° on a national highway. The roadbed slope collapsed under the action of long-term extreme rainstorms. The sliding range is about 15m in the longitudinal direction of the road surface. The damage range is large, seriously affecting the normal operation of traffic. In order to ensure the safety of people's lives and property and quickly restore traffic, the pile-sheet support structure and construction method are used to repair the roadbed slope.

[0094] The specific operations are as follows:

[0095] (7.1) According to the requirements of the Code for Geotechnical Engineering Investigation (GB 50021-2001), an on-site investigation was conducted on the soil quality and hydrological distribution of the collapsed roadbed slope. The investigation showed that under the action of long-term extreme rainstorms, the shear strength of the existing soil on the roadbed slope was seriously reduced, even less than 60% of the designed soil shear strength, which was the main reason for the collapse of the roadbed slope.

[0096] (7.2) Combined with the size parameters of the prefabricated components of the pile-sheet support structure, the layout dimensions of the pile-sheet support structure are designed. The starting position of the pile-sheet support structure is arranged at the shoulder of the stable section on both sides of the landslide embankment slope and about 1.26m away from the damaged section (that is, the pile-sheet support structure is about 17.52m long in the longitudinal direction of the road surface). At the same time, the embedded length of the steel pile is 1 / 2 of the pile length, that is, 1m, and the embedded length of the hollow prefabricated partition is 0.5m.

[0097] (7.3) According to the design regulations of slope anti-slide piles in the Technical Code for Slope Engineering of Buildings (GB 50330-2013), combined with the proposed layout size of the pile-sheet support structure and the existing soil shear strength of the landslide roadbed slope, the number of rows of pile-sheet support structures is determined based on the slope stability evaluation method recommended by the code and the safety factor required for slope stability. The data shows that under the proposed layout size of the pile-sheet support structure, one row of pile-sheet support structures is sufficient. In addition, there are also a few cases where two or even three rows of pile-sheet support structures need to be arranged. In this case, the first row is arranged on the shoulder, and the second and third rows are arranged farther away from the road.

[0098] (7.4) Based on the above design results, it can be seen that the emergency repair work of the roadbed slope requires the arrangement of 9 steel piles and 8 rows of hollow prefabricated partitions. The number of standard blocks required for the two is selected according to the actual length of the steel piles and the length of the hollow prefabricated partitions. Furthermore, combined with the construction process of the pile-board support structure, rapid emergency repair construction work on the collapsed roadbed slope is carried out.

[0099] (7.5) During the construction process, small pile drivers and small cranes are used as construction equipment for the pile-sheet support structure: when constructing steel piles, first, a small pile driver construction platform is built on the sliding body and a small crane construction platform is built on the completed adjacent support structure to drive the steel piles into the designed depth. When the steel piles are exposed above the soil, the small pile driver construction platform on the sliding body can be removed. The steel piles only need to be further spliced ​​to the designed height on the small crane construction platform. After the construction is completed, the small crane construction platform is removed. When constructing hollow prefabricated partitions, small pile drivers and small crane construction platforms are built on the completed adjacent support structure to construct the hollow prefabricated partitions to the designed height, and then the small pile drivers and small crane construction platforms are removed.

[0100] (7.6) After the installation of the pile-sheet support structure is completed, the original slope soil is backfilled in the damaged section of the road surface and compacted with a roller to restore road traffic.

[0101] (7.7) After the extreme rainstorm ends, the roadbed slope is further reinforced and repaired. The pile-sheet support structure of the present invention is generally permanently retained at the slope, but it can also be dismantled and reused.

[0102] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A supporting structure for rapid repair of collapsed roadbed slope, characterized in that: The support structure is a pile-sheet support structure, and is composed of steel piles (12) and hollow prefabricated partitions (13); The steel pile (12) comprises a steel pile bottom block section (14), a steel pile standard block section (15), a steel pile splicing pin (17), and a steel pile splicing screw (18). The steel pile bottom block section (14) and the steel pile standard block section (15) both comprise a plurality of steel pile splicing sinks (16) arranged at the top thereof and used to match with a plurality of steel pile splicing pins (17). The steel pile bottom block section (14) and the steel pile standard block section (15) both comprise two steel pile wing plates (121) and a steel pile web plate (122). The two steel pile wing plates (121) are arranged in parallel and together with the steel pile web plate (122) form an I-shaped structure. Embedding grooves (123) symmetrically arranged on the left and right sides are formed between the steel pile webs (122); the lower end of the steel pile bottom block section (14) is provided with a sharp structure (141) for easy wedging into the soil layer, and the lower end of the steel pile standard block section (15) is provided with the steel pile splicing pin (17); steel pile screw holes (124) are provided at the steel pile wing plate (121) at the top of the steel pile bottom block section (14), at the steel pile wing plate (121) at the top of the steel pile standard block section (15), and at the steel pile splicing pin (17) at the bottom of the steel pile standard block section (15), and the steel pile screw holes (124) are used for the steel pile splicing screw (18) to pass through; The hollow prefabricated partition (13) comprises a partition bottom block (20), a partition standard block (21), a partition splicing pin (23), and a partition splicing screw (25). The partition bottom block (20) and the partition standard block (21) both comprise a plurality of partition splicing sinks (22) arranged at the top thereof and used to match with a plurality of partition splicing pins (23). The partition bottom block (20) and the partition standard block (21) both comprise a partition web (131) enclosing a rectangular structure and partition wing plates (132) arranged on the left and right sides of the partition web (131). The partition web (131) encloses a hollow structure (133) of the partition. The partition wing plates (132) are used to be clamped into the steel piles (12). Embedded in the groove (123); the lower end of the partition bottom block section (20) is provided with a gradual structure (201) that is convenient for wedging into the soil layer, and the lower end of the partition standard block section (21) is provided with the partition splicing pin (23); partition screw holes (134) are provided at the partition web (131) at the top of the partition bottom block section (20), at the partition web (131) at the top of the partition standard block section (21), and at the partition splicing pin (23) at the bottom of the partition standard block section (21), and the partition screw holes (134) are used for the partition splicing screws (25) to pass through; and a plurality of pre-buried drainage holes (24) are provided in the thickness direction of the partition bottom block section (20) and the partition standard block section (21).

2. The support structure according to claim 1, characterized in that: The steel pile (12) further comprises a short steel column (19), wherein the short steel column (19) is used to hammer the steel pile bottom block section (14) and the steel pile standard block section (15) into the soil layer during steel pile construction; a steel pile splicing pin (17) is arranged at the lower end of the short steel column (19), a handle (191) is arranged at the top of the short steel column (19), and an embedding groove (123) is arranged at the side of the short steel column (19); preferably, the short steel column (19) is a U-shaped short steel column with the embedding groove (123) opened only on one side.

3. The support structure according to claim 1, characterized in that: The hollow prefabricated partition (13) further comprises a cap plate (26), wherein the cap plate (26) is used for hammering the partition bottom block section (20) and the partition standard block section (21) into the soil layer during the construction of the hollow prefabricated partition (13), a partition splicing pin (23) is arranged at the lower end of the cap plate (26), a handle (261) is arranged at the top of the cap plate (26), and a cap plate wing plate (262) matching the embedding groove (123) of the steel pile (12) is arranged on the side of the cap plate (26).

4. A construction method for rapid repair of collapsed roadbed slope, characterized in that: The pile-sheet support structure according to any one of claims 1 to 3 is used; and the construction method comprises the following steps: S1: Construction starts from the shoulders of the stable sections on both sides of the collapsed roadbed slope and closes symmetrically toward the middle of the damaged section. There is no need to unload and clean the sliding body in the collapsed roadbed slope in advance; and steel pile construction is carried out first; S2: After the construction of two adjacent steel piles is completed, the hollow prefabricated partition is constructed; S3: Repeat steps S1 and S2 until the pile-sheet support structure is closed, and then backfill the original soil of the slope to the initial elevation.

5. The construction method according to claim 4, characterized in that: Step S1 includes the following steps: S1-1: First, position the bottom block of the steel pile at the predetermined position, and then embed the short steel column into the bottom block of the steel pile. Hammer the steel pile vertically, and leave 30 to 100 cm of the top of the bottom block of the steel pile without embedding it into the soil to prepare for the construction of the first standard block of the steel pile, and then remove the short steel column. S1-2: Then embed the first steel pile standard block section downward into the bottom block section of the steel pile, and lock the upper and lower blocks with steel pile splicing screws, and embed the short steel column downward into the steel pile standard block section, and hammer the steel pile in the vertical direction. Leave a height of 30 to 100 cm on the upper part of the steel pile standard block section without embedding it into the soil to prepare for the construction of the next steel pile standard block section, and remove the short steel column; according to the set pile length, splice one or multiple steel pile standard blocks in sequence according to the method in this step.

6. The construction method according to claim 5, characterized in that: Step S2 includes the following steps: S2-1: After completing the construction of two adjacent steel piles, first install short steel columns on the tops of the two adjacent steel piles; use the embedding grooves of the short steel columns to locate the bottom block section of the partition, and embed the cap plate downward into the bottom block section of the partition, and hammer it into the partition in the vertical direction. Leave a height of 30 to 100 cm on the upper part of the bottom block section of the partition without embedding it in the short steel columns, in preparation for the construction of the first standard block section of the partition, and then remove the cap plate; S2-2: Then embed the first partition standard block section downward into the partition bottom block section, and lock the upper and lower blocks with the partition splicing screws, and embed the cap plate downward into the partition standard block section, and hammer it into the partition in the vertical direction. Leave a height of 30 to 100 cm on the upper part of the partition standard block section and do not embed it into the short steel column to prepare for the construction of the next partition standard block section, and remove the cap plate; according to the set board length, splice one or multiple partition standard block sections in sequence according to the method of this step; S2-3: After the construction of the hollow prefabricated partition is completed, the short steel columns on the top of the steel piles on both sides are removed to pour concrete to fill the hollow prefabricated partition.

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