CN118814820A - A kind of excavation slope pre-reinforcement pile wall support structure and method - Google Patents

Abstract

The invention discloses a support structure and a method for a pre-reinforced pile wall of a cut side slope, and particularly relates to the field of cut structures of buildings. According to the invention, the supporting structure is completed in the mode of assembling the stress frame assembly, the tensioning supporting frame and the wallboard assembly, the clamping position of the supporting arm I and the rib plate pile is formed, the supporting plate lower than the position of the fixed plate body is in contact and support with the protecting plate, and the force channels of the rib plate pile, the tensioning supporting frame and the transverse supporting rod are conducted to act on the stress supporting rods in the direction, so that each stress supporting rod forms axial stress resistance, the whole supporting structure is not provided with a fixed structure such as concrete, flexible fixing and the like, and the whole device can be simply disassembled only by disassembling the fixing piece during subsequent disassembly, thereby facilitating the subsequent disassembly convenience of the temporary supporting structure and reducing the investment of the early cost.

Description

A kind of excavation slope pre-reinforcement pile wall support structure and method

Technical Field

The present invention relates to the technical field of building excavation structures, and more particularly to an excavation slope pre-reinforcement pile wall supporting structure and method.

Background Art

In the construction process of building engineering, road engineering, water conservancy engineering and other fields, excavation is one of the key tasks in the construction preparation stage. It is necessary to excavate part of the soil and stone volume from the original ground to the design elevation (such as the roadbed surface, the bottom of the foundation pit, etc.) to ensure the smooth progress of subsequent construction and the quality of the project. Through excavation, the necessary construction space can be created to meet the requirements of the project design and ensure the stability and safety of the project structure.

Before excavation, detailed geological survey and assessment must be carried out. This includes identifying the geological structure, rock and soil properties, hydrogeological conditions, etc. of the construction area, and assessing the risk of geological disasters that may be encountered during excavation, such as landslides, collapses, mudslides, etc. After the excavation work is completed, it is necessary to install wall piles on the excavation slope for protection; the pre-reinforcement pile wall support of the excavation slope is an important means to ensure construction safety and control slope stability in civil engineering. Its design, construction and later maintenance must strictly follow scientific specifications; in today's excavation slope protection technology, it can be roughly divided into the following categories:

Gravity support: such as gravity retaining wall, which relies on its own weight to maintain stability and is suitable for medium and low height slopes;

Anchor support: including anchor support and anchor cable support, which uses prestressed anchor rods or anchor cables to tightly connect the support structure with the rock and soil to improve the overall stability;

Reinforced soil support: using reinforcing materials (such as geocells) and fill soil to enhance soil strength; forming reinforced soil retaining walls or reinforced soil slopes;

Pile-sheet support: such as anti-sliding piles and underground continuous walls, which resist the sliding force of the slope through the embedding effect of the pile body or wall and the friction with the soil;

Flexible support: including vegetation slope protection, ecological bags, etc., using the physical and chemical effects of vegetation roots or flexible materials to enhance slope stability and promote ecological restoration;

Among them, pile-board support is widely used as a temporary support scheme for excavation in conventional construction projects. As a temporary protective structure, it can be reused after subsequent disassembly, thereby reducing the investment cost of a single batch. However, it still has the disadvantage of insufficient stability during actual use. Therefore, during the construction process, concrete foundation piles or additional stability brackets are often used to maintain its support stability. However, this increases the difficulty and cost of subsequent disassembly work.

Summary of the invention

In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a pre-reinforced pile wall support structure and method for an excavated slope. The technical problem to be solved by the present invention is: how to adaptively improve the temporary support structure of the excavated slope to adapt to subsequent disassembly work and cost investment.

To achieve the above-mentioned object, the present invention provides the following technical solutions: a pre-reinforced pile wall support structure for a cut slope, comprising four wall panel assemblies, two adjacent sets of wall panel assemblies are vertically arranged to form a boxway structure, the wall panel assemblies comprise a plurality of sets of rib sheet piles arranged longitudinally and guard plates arranged transversely between the rib sheet piles, the four sets of wall panel assemblies are stress-supported by stress frame assemblies, and a tensioning support frame is provided at the connection between the stress frame assemblies and each wall panel assembly;

The rib sheet pile comprises a square steel column, an L-shaped retaining frame is fixedly provided on the outer side of the square steel column, a fixing sheet is provided on the side of the connection between two longitudinally arranged square steel columns, and a positioning retaining convex column is fixedly provided on the inner wall of the square steel column;

The stress frame assembly includes a transverse support rod connected between the tension support frames corresponding to the single wall panel assembly, a longitudinal support rod is provided between the two longitudinal transverse support rods, and a stress support rod is vertically connected between the transverse support rods at the same plane height, and the connection between the transverse support rod, the longitudinal support rod and the stress support rod is provided with a fixing piece;

The tensioning support frame includes a supporting pile, one end of the supporting pile is fixedly provided with a casing column, the end of the supporting pile away from the casing column is fixedly provided with a plurality of supporting arms I and supporting arms II, the plurality of supporting arms I and supporting arms II are staggered, the end of the supporting arm II away from the supporting pile is fixedly provided with a supporting plate, the end of the supporting arm I away from the supporting pile is fixedly provided with a fixing plate, and a fixing groove is also provided on the fixing plate, the fixing groove is arranged in an arc shape, and the fixing groove is clamped with the positioning and retaining boss.

In a preferred embodiment, the guard plate includes a main body plate and a weight-reducing groove in a rectangular array on one side of the main body plate, and the depth of the weight-reducing groove is less than the thickness of the main body plate, and a micro through hole is also provided between the bottom end of the weight-reducing groove and the inner wall of the main body plate;

The slot formed between the two L-shaped retaining frames and the outer wall of the square steel column is equivalent to the thickness of the main body plate.

In a preferred embodiment, the square steel column and the fixing plate, and the L-shaped retaining frame and the main plate are fixed by fixing bolts, and the L-shaped retaining frame, the square steel column and the fixing plate are all provided with fixing holes matched with the fixing bolts.

In a preferred embodiment, a shelter base is also installed at the bottom of the rib sheet pile, and the shelter base is detachably connected to the bottom end of the square steel column;

The shelter base comprises a base body, a plug-in square column is fixedly arranged on the top of the base body, and the plug-in square column is adapted to the inner cavity of the square steel column, and the bottom end of the square steel column and the plug-in square column are fixed by bolts.

In a preferred embodiment, the fixing member includes a buckle body and an external fixing insert, and locking members are provided at the connection between the longitudinal support rod and the stress support rod and the external fixing insert, and at the connection between the external fixing insert and the buckle body. The locking member is configured as a bolt and nut combination, and the buckle body is fixed to the outer wall of the rod body at the connection.

In a preferred embodiment, the transverse support rod is plugged into the casing column, and the support pile, casing column, support arm I, support arm II and fixed plate are integrally formed.

The present invention also includes a method for pre-reinforced pile wall support of excavated slope, and the specific support steps are as follows:

Step S1: Clean and measure the excavation site according to the size of the excavation construction drawing to ensure the excavation design elevation and level and trim the side wall of the slope;

Step S2: assembling an appropriate number of rib sheet piles and guard plates into a wall panel assembly according to the size of the slope, and loading the shelter base onto the bottom end of the middle rib sheet pile of the wall panel assembly;

Step S3: The wall panel components assembled in step S2 are sequentially transferred to the slope positions after trimming, and a burial pit is excavated based on the position of the shelter base at the bottom of the wall panel components, and the shelter base is placed in the burial pit and backfilled with soil to fix it, and this is repeated to fit each wall panel component to each wall of the slope for preliminary installation;

Step S4: Select an appropriate amount of tension support frame, and fix the other steel column by the support arm I and the fixing plate through the locking groove and the positioning and holding convex column, and support the guard plate around the tension support frame in the installation position by the support arm II and the fixing plate;

Step S5: inserting the transverse support rods along the casing column at the same horizontal height, selecting stress support rods of appropriate length to be arranged horizontally and vertically with the transverse support rods, and fixing the connection points of each rod with fixing parts to form a rod-shaped support mesh structure composed of multiple rods;

Step S6: according to the steps in step S5, the tension support frame corresponding to the next layer of guard plate is fixed by the rod-shaped support mesh structure, and the longitudinal support rods and fixing parts are used to complete the limit fixation between the rod-shaped support mesh structures of each layer, so as to form a stress frame assembly with a mesh-shaped force relief at the force points;

Step S7: Conduct quality inspection and acceptance work, strengthen on-site safety management, set up safety warning signs and protective facilities; conduct regular safety inspections and potential hazard inspections, and promptly rectify any problems found.

In a preferred embodiment, when the guard plate is installed on the rib pile in step S2, the side of the guard plate with the weight reduction groove is set close to the slope, and when the guard plate is installed on the L-shaped retaining frame, the guard plate, the L-shaped retaining frame and the square steel column are fixed with fixing bolts.

Technical effects and advantages of the present invention:

1. The present invention completes the support structure by assembling a stress frame assembly, a tension support frame and a wall panel assembly. The tension support frame is assembled at the position of the rib sheet pile to form a support arm I and the rib sheet pile to maintain the fixed position. The support plate below the position of the fixed plate contacts and supports the guard plate. When the wall panel assembly is subjected to the reverse force from the excavation slope and topples over, the force is transmitted to the stress support rod in this direction through the rib sheet pile, the tension support frame and the cross support rod. The stress generated by the stress support rod in this direction is limited by the position of the stress support rod in other directions by the excavation slope, forming an axial reverse stress support. The fixing parts assemble the stress support rods into a quadrilateral frame to form a stress point, so that each stress support rod forms an axial stress resistance, forming a stress force transmission line directly from the guard plate, the tension support frame to the stress frame assembly, so as to ensure a good support effect of the high support, ensure safety and stability in subsequent use, and prevent slipping. When accidents such as slope and collapse occur, when shallow-scale excavation is used for support, the guard plates can be set as wooden boards, and the stress frame components and tension support frames support each guard plate to ensure that the stress frame components support the wall panel components. When deep-scale excavation is used for support, the guard plates are set as metal support plates, which can ensure that the wall panel components do not shift sideways when assembling the wall panel components and the stress frame components. The force of the rib piles, tension support frames and cross support rods is transmitted to the stress support rods in this direction, and the stress frame components ensure the stability of the guard plate position of this layer, forming a good support and protection component. The overall support structure is not provided with fixed structures such as concrete and flexible fixings. In the subsequent disassembly, only the fixings need to be disassembled to simply complete the disassembly of the overall device, which is convenient for the subsequent disassembly of the temporary support structure and reduces the initial cost investment. Under the premise of ensuring safety and quality, the cost is reasonably controlled to improve the economic benefits of the project.

2. The present invention not only provides weight-reducing grooves to reduce the overall weight of the guard plate through the structural setting of the guard plate and the addition of a shelter base, but also the setting of micro-through holes allows the guard plate to form a passage with the outside air, thereby avoiding the difficulty of disassembly caused by the pressure difference similar to that of a suction cup. The micro-sized through holes can also prevent soil and gravel from falling, and the large-sized base body can be buried to form support and protection, which can ensure that the wall panel assembly does not shift laterally when assembling the wall panel assembly and the stress frame assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of the present invention.

FIG. 2 is a schematic diagram of the overall structure of the present invention from a second viewing angle.

FIG. 3 is a schematic structural diagram of a wall panel assembly (inside perspective) of the present invention.

FIG. 4 is a schematic structural diagram of a wall panel assembly (from an outside perspective) according to the present invention.

FIG. 5 is a schematic structural diagram of the rib sheet pile assembly state of the present invention.

FIG. 6 is a schematic diagram of the rib sheet pile structure of the present invention.

FIG. 7 is a schematic diagram of the shelter base structure of the present invention.

FIG. 8 is a schematic diagram of the guard plate structure of the present invention.

FIG. 9 is a schematic diagram of the tension support structure of the present invention.

FIG. 10 is a schematic structural diagram of a stress rack assembly of the present invention.

FIG. 11 is an enlarged view of the structure of section A in FIG. 10 of the present invention.

The reference numerals in the accompanying drawings are: 1 rib sheet pile, 2 guard plate, 3 stress frame assembly, 4 tension support frame, 5 shelter base;

11 square steel column, 12 L-shaped retaining frame, 13 fixing bolt, 14 fixing plate, 15 positioning retaining boss;

21 main body plate, 22 weight reduction groove;

31 transverse support rod, 32 stress support rod, 33 longitudinal support rod, 34 fixing piece;

41 supporting pile, 42 casing column, 43 supporting arm I, 44 supporting arm II, 45 supporting plate, 46 fixing plate, 47 fixing slide groove;

51 is a base body, 52 is a plug-in square column;

341 is a buckle body, 342 is an external fixing insert, and 343 is a locking piece.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment 1:

The present invention provides a pre-reinforced pile wall support structure for excavated slopes as shown in FIG1-11, which includes four wall panel assemblies as shown in the loading diagram of FIG1-2, and four sets of wall panel assemblies are adjacently and vertically arranged to form a box-shaped channel. The wall panel assemblies include a plurality of sets of rib sheet piles 1 arranged longitudinally and guard plates 2 arranged transversely between the rib sheet piles 1. The four sets of wall panel assemblies are stress-supported by stress frame assemblies 3, and a tensioning support frame 4 is provided at the connection between the stress frame assemblies 3 and each wall panel assembly;

As shown in Figure 3-6, the rib sheet pile 1 includes a square steel column 11, an L-shaped retaining frame 12 is fixedly provided on the outer side of the square steel column 11, a fixing plate 14 is provided on the side of the connection between the two longitudinally arranged square steel columns 11, and a positioning and retaining protrusion 15 is fixedly provided on the inner wall of the square steel column 11. The square steel column 11 and the fixing plate 14, the L-shaped retaining frame 12 and the main plate 21 are all fixed by fixing bolts 13, and the L-shaped retaining frame 12, the square steel column 11 and the fixing plate 14 are all provided with fixing holes that are compatible with the fixing bolts 13. According to the width of the excavation slope, an appropriate number of rib sheet piles 1 are selected, and after the guard plate 2 is loaded on the rib sheet pile 1, the position of the rib sheet pile 1 on the guard plate 2 is adjusted, and the tensioning support frame 4 is used to limit the position of the adjacent rib sheet piles 1, thereby completing the assembly of a single wall panel assembly;

When performing shallow excavation (about 0-2 meters) for support, insert the bottom of the square steel column 11 (i.e., the part of the square steel column 11 not loaded with the guard plate 2) where the bottom end of the assembled wall panel assembly does not overlap with the L-shaped retaining frame 12 into the bottom of the excavation as a temporary wall panel assembly support point to ensure that the guard plate 2 completely covers the inner wall of the slope, and the stress frame assembly 3 and the tension support frame 4 support each wall panel assembly to ensure that the stress frame assembly 3 supports the wall panel assembly to prevent it from tipping over;

As shown in FIG10 , the stress rack assembly 3 includes a transverse support rod 31 connected between the tension support frames 4 corresponding to the single wall panel assembly, a longitudinal support rod 33 is provided between the two longitudinal transverse support rods 31, and a stress support rod 32 is vertically connected between the transverse support rods 31 at the same plane height, and fixing parts 34 are provided at the connection points of the transverse support rod 31, the longitudinal support rod 33 and the stress support rod 32;

As shown in FIG. 11 , the fixing member 34 includes a buckle body 341 and an external fixing insert 342. A locking member 343 is provided at the connection between the longitudinal support rod 33 and the stress support rod 32 and the external fixing insert 342, and at the connection between the external fixing insert 342 and the buckle body 341. The locking member 343 is configured as a bolt and nut combination, and the buckle body 341 is fixed to the outer wall of the rod at the connection. The rod-shaped support mesh structure at the same horizontal height position is formed into a rod-shaped force mesh structure with different force directions for each stress support rod 32. When the wall panel assembly is subjected to the reverse force from the excavation slope and collapses, the wall panel assembly is locked. When the force is transmitted through the rib pile 1, the tension support frame 4 and the transverse support rod 31 to the stress support rod 32 in this direction, the stress generated by the stress support rod 32 in this direction is restricted by the position of the stress support rod 32 in other directions by the excavation slope, forming an axial reverse stress support. At this time, the stress support rods 32 are assembled into a quadrilateral frame through the fixing parts 34 to form a force point, so that each stress support rod 32 forms an axial stress resistance, which is similar to the stress synchronization between the supporting legs of the bench, so that the stress frame assembly 3 ensures the stability protection of the position of the layer of guard plate 2;

As shown in Figures 3 and 9, the tension support frame 4 includes a support pile 41, one end of the support pile 41 is fixedly provided with a casing column 42, and the end of the support pile 41 away from the casing column 42 is fixedly provided with a plurality of support arms I 43 and support arms II 44, and the plurality of support arms I 43 and support arms II 44 are staggered, and the end of the support arm II 44 away from the support pile 41 is fixedly provided with a support plate 45, and the end of the support arm I 43 away from the support pile 41 is fixedly provided with a fixed plate 46, and the fixed plate 46 is also provided with a locking groove 47, and the locking groove 47 is set in an arc shape, and the locking groove 47 is engaged with the positioning and retaining protrusion 15; the horizontal support rod 31 is plugged with the casing column 42, and the support pile 41, the casing column 42, the support arm I 43, the support arm II 44 and the fixed plate 46 are integrally formed;

When assembling the tensioning support frame 4 to the position of the rib sheet pile 1, first align the end opening of the locking slot 47 with the positioning and retaining protrusion 15, rotate the supporting pile 41 to lock the positioning and retaining protrusion 15 at the end of the locking slot 47, so that the tensioning support frame 4 and the rib sheet pile 1 are locked in position. At this time, the support plate 45, which is lower than the position of the fixed plate 46, contacts and supports the guard plate 2, forming a stress force transmission line directly from the guard plate 2 and the tensioning support frame 4 to the stress frame assembly 3, so as to ensure a good support effect of high support.

Embodiment 2:

Based on the wall panel assembly proposed in Example 1, the present invention provides a further technical solution for the rib piles 1 and the guard plate 2.

Please refer to Figures 4-8. The guard plate 2 provided by the present invention includes a main body plate 21 and a weight-reducing groove 22 formed in a rectangular array on one side of the main body plate 21. The depth of the weight-reducing groove 22 is less than the thickness of the main body plate 21. A plurality of micro-through holes are also provided between the bottom end of the weight-reducing groove 22 and the inner wall of the main body plate 21. The size of the micro-through holes is set to 2-3 mm. The slot formed between the two L-shaped retaining frames 12 and the outer wall of the square steel column 11 is equivalent to the thickness of the main body plate 21. When the main body plate 21 is attached to the excavated slope, not only the weight-reducing groove 22 can reduce the overall weight of the guard plate 2, but also the excavated slope in a humid slope environment (clay, high-humidity soil) will adsorb the main body plate 21. The provision of the micro-through holes can form a passage between the guard plate 2 and the external air, avoiding the difficulty of disassembly caused by the pressure difference similar to that of a suction cup, and the provision of the micro-sized through holes can prevent soil and gravel from falling.

A shelter base 5 is also installed at the bottom of the rib sheet pile 1, and the shelter base 5 is detachably connected to the bottom end of the square steel column 11; the shelter base 5 includes a base body 51, and a plug-in square column 52 is fixedly provided on the top of the base body 51, and the plug-in square column 52 is adapted to the inner cavity of the square steel column 11, and the bottom end of the square steel column 11 is fixed to the plug-in square column 52 by bolts;

When supporting deep excavation (pit depth exceeding 2 meters), after the rib sheet piles 1 and the guard plates 2 are assembled, an appropriate number of shelter bases 5 are selected and loaded on the bottom of the rib sheet piles 1. After the loaded wall panel assembly is aligned with the excavation slope, a burial trench is excavated by the shelter base 5 in alignment with the excavation site, and then the shelter base 5 together with the rib sheet piles 1 are settled in the burial trench and backfilled with soil to fix them. The large-sized base body 51 is buried to form support protection, which can ensure that the wall panel assembly does not shift laterally when assembling the wall panel assembly and the stress frame assembly 3.

Specifically, the present invention also includes a method for pre-reinforced pile wall support of excavated slope, and the specific support steps are as follows:

Step S1: Clean and measure the excavation site according to the size of the excavation construction drawing to ensure the excavation design elevation, and level and trim the side walls of the slope to avoid affecting the installation effect of the wall panel components due to the unevenness of the slope;

Step S2: according to the size of the slope, assemble an appropriate number of rib sheet piles 1 and guard plates 2 into a wall panel assembly, reasonably determine the number and position of the rib sheet piles 1 to ensure the overall support effect, and load the shelter base 5 on the bottom end of the middle rib sheet pile 1 of the wall panel assembly. When installing the guard plate 2 on the rib sheet pile 1, set the side of the guard plate 2 with the weight reduction groove 22 close to the slope, and when installing the guard plate 2 on the L-shaped retaining frame 12, use the fixing bolts 13 to fix the guard plate 2, the L-shaped retaining frame 12 and the square steel column 11;

Step S3: The wall panel components assembled in step S2 are sequentially transferred to the slope positions after trimming, and a burial pit is excavated based on the position of the shelter base 5 at the bottom of the wall panel components, and the shelter base 5 is placed in the burial pit and backfilled with soil to fix it, and this is repeated to fit each wall panel component to each wall of the slope for preliminary installation;

Step S4: Select an appropriate amount of tension support frame 4, and fix the other steel column 11 by the support arm I 43 and the fixing plate 46 through the locking of the locking groove 47 and the positioning and holding protruding column 15, and support the guard plate 2 around the tension support frame 4 in the installation position by the support arm II 44 and the fixing plate 46;

Step S5: insert the transverse support rod 31 along the casing column 42 at the same horizontal height, select the stress support rod 32 of appropriate length to be arranged horizontally and vertically with the transverse support rod 31, and use the fixing member 34 to fix the connection between the rods to form a rod-shaped support mesh structure composed of multiple rods;

Step S6: According to the steps in step S5, the tension support frame 4 corresponding to the next layer of guard plate 2 is fixed by the rod-shaped support mesh structure, and the longitudinal support rods 33 and the fixing parts 34 are used to complete the limit fixation between the rod-shaped support mesh structures of each layer, and the tension prestress is generated at the intersection of each stress support rod 32 and the fixing part 34, so as to form a stress frame assembly 3 with a mesh-shaped force relief at the force point, and the prestress applied to each other between the stress support rods 32 is used to offset the external load acting on the guard plate 2 by the slope, thereby improving the bearing capacity and stability of the support structure, and the longitudinal support rods 33 are added to form a connection between the rod-shaped support mesh structures of each layer;

Step S7: Conduct quality inspection and acceptance work, strengthen on-site safety management, set up safety warning signs and protective facilities; conduct regular safety inspections and potential hazard inspections, and promptly rectify any problems found.

Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

Finally: 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, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The utility model provides a stake wall supporting construction is strengthened in advance to excavation side slope, includes four face wallboard subassemblies, and four sets of wallboard subassemblies are adjacent to set up perpendicularly to construct the case form, its characterized in that: the wallboard components comprise a plurality of groups of longitudinally arranged reinforcement plate piles (1) and guard plates (2) transversely arranged between the reinforcement plate piles (1), stress support is carried out among the four groups of wallboard components by a stress frame component (3), and a tensioning support frame (4) is arranged at the joint of the stress frame component (3) and each wallboard component;

The rib plate pile (1) comprises square steel columns (11), an L-shaped retainer (12) is fixedly arranged on the outer side face of each square steel column (11), fixing sheets (14) are arranged on the side face of the joint of two vertically arranged square steel columns (11), and positioning retaining convex columns (15) are fixedly arranged on the inner wall of each square steel column (11);

The stress frame assembly (3) comprises transverse supporting rods (31) connected between tensioning supporting frames (4) corresponding to a single wallboard assembly, longitudinal supporting rods (33) are arranged between the two longitudinal transverse supporting rods (31), stress supporting rods (32) are vertically connected between the transverse supporting rods (31) with the same plane height, and fixing pieces (34) are arranged at the connecting positions of the transverse supporting rods (31), the longitudinal supporting rods (33) and the stress supporting rods (32);

Tensioning support frame (4) are including supporting stake (41), supporting stake (41) one end is fixed to be equipped with casing string (42), supporting stake (41) are kept away from casing string (42) one end and are fixed to be equipped with a plurality of support arms I (43) and support arm II (44), a plurality of support arms I (43) and the crisscross setting of support arm II (44), supporting stake (41) one end is kept away from to support arm II (44) is fixed to be equipped with supporting disk (45), supporting stake (41) one end is kept away from to support arm I (43) is fixed to be equipped with fixed disk (46), and still has seted up card locking spout (47) on fixed disk (46), card locking spout (47) set up to convex (15) joint is kept to card locking spout (47).

2. The excavated side slope pre-reinforced pile wall supporting structure according to claim 1, wherein: the guard board (2) comprises a main body board (21) and weight-reducing grooves (22) which are arranged on one side of the main body board (21) in a rectangular array, the depth of each weight-reducing groove (22) is smaller than the thickness of the main body board (21), and miniature through holes are further formed between the bottom ends of the weight-reducing grooves (22) and the inner wall of the main body board (21);

the slot formed between the two L-shaped retainers (12) and the outer wall of the square steel column (11) is equal to the thickness of the main body plate (21).

3. The excavated side slope pre-reinforced pile wall supporting structure according to claim 2, wherein: the square steel column (11) and the fixing piece (14), the L-shaped retainer (12) and the main body plate (21) are fixed through fixing bolts (13), and fixing holes matched with the fixing bolts (13) are formed in the L-shaped retainer (12), the square steel column (11) and the fixing piece (14).

4. The excavated side slope pre-reinforced pile wall supporting structure according to claim 1, wherein: a shelter base (5) is further arranged at the bottom of the rib plate pile (1), and the shelter base (5) is detachably connected with the bottom end of the square steel column (11);

The shelter base (5) comprises a base main body (51), a plug square column (52) is fixedly arranged at the top end of the base main body (51), the plug square column (52) is matched with the inner cavity of the square steel column (11), and the bottom end of the square steel column (11) is fixed with the plug square column (52) through bolts.

5. The excavated side slope pre-reinforced pile wall supporting structure according to claim 1, wherein: the fixing piece (34) comprises a hasp main body (341) and an outer fixing inserting piece (342), a connecting part of the longitudinal supporting rod (33) and the stress supporting rod (32) and the outer fixing inserting piece (342), and a connecting part of the outer fixing inserting piece (342) and the hasp main body (341) are respectively provided with a locking piece (343), the locking pieces (343) are combined through bolts and nuts, and the hasp main body (341) is fixed with the outer wall of a rod body at the connecting part.

6. The excavated side slope pre-reinforced pile wall supporting structure according to claim 1, wherein: the transverse supporting rod (31) is inserted into the casing string (42), and the supporting pile (41), the casing string (42), the supporting arm I (43), the supporting arm II (44) and the fixing disc (46) are integrally formed.

7. A method for supporting a pre-reinforced pile wall of a excavated side slope, which is applicable to the pre-reinforced pile wall supporting structure of the excavated side slope according to any one of claims 1 to 6, and is characterized in that: the concrete support steps are as follows:

Step S1: according to the excavation construction drawing, cleaning and measuring paying-off are carried out on the excavation site according to the size, the excavation design elevation is ensured, and the side wall of the side slope is flattened and trimmed;

Step S2: assembling a proper number of rib plate piles (1) and guard plates (2) into a wallboard assembly according to the side slope size, and loading a shelter base (5) at the bottom end of the middle rib plate pile (1) of the wallboard assembly;

Step S3: sequentially transferring the wallboard assemblies assembled in the step S2 to the slope position after finishing, excavating a buried foundation pit based on the position of a shelter base (5) at the bottom of the wallboard assemblies, placing the shelter base (5) in the buried foundation pit, backfilling and fixing, and repeating the steps to attach each wallboard assembly to each wall of the slope for preliminary installation;

Step S4: a proper amount of tensioning support frame (4) is selected, the square steel column (11) is fixed by a support arm I (43) and a fixed disc (46) through the clamping of a clamping chute (47) and a positioning and retaining convex column (15), and a guard plate (2) around the tensioning support frame (4) under the installation position is supported by a support arm II (44) and the fixed disc (46);

Step S5: inserting the transverse supporting rods (31) along a casing string (42) with the same horizontal height, selecting a stress supporting rod (32) with a proper length to be horizontally and vertically arranged with the transverse supporting rods (31), and fixing the connecting parts of the rods by using fixing pieces (34) to form a rod-shaped supporting net structure consisting of a plurality of rods;

step S6: the tensioning support frame (4) corresponding to the next layer of guard plate (2) is fixed by a rod-shaped supporting net structure according to the step in the step S5, and limiting and fixing among all layers of rod-shaped supporting net structures are finished by using a longitudinal support rod (33) and a fixing piece (34), so that a stress frame assembly (3) with a net-shaped stress unloading point is formed;

step S7: performing quality inspection and acceptance work, enhancing field safety management, and setting a safety warning sign and a protection facility; and (5) carrying out safety inspection and hidden trouble investigation at regular intervals, and correcting the found problems in time.

8. The method for supporting the pre-reinforced pile wall of the excavated side slope according to claim 7, wherein the method comprises the following steps: in the step S2, when the guard plate (2) is mounted on the rib plate pile (1), one side of the guard plate (2) provided with the weight reduction groove (22) is arranged on the side close to the side slope, and when the guard plate (2) is mounted on the L-shaped retainer (12), the guard plate (2), the L-shaped retainer (12) and the square steel column (11) are fixed by using the fixing bolts (13).