A prefabricated inclined bracing and its construction method

Abstract

This invention relates to a prefabricated inclined bracing system and its construction method, primarily used in foundation pit support engineering. The prefabricated inclined bracing system includes lattice support sections, steel pipe sections, pile tips, a power unit, angle connectors, clearance structures, reinforcing members, and bolts. Multiple lattice support sections are assembled with bolts to form an inclined bracing system, and multiple steel pipe sections are assembled with bolts and inserted into the soil below the foundation to form support piles. Both the inclined bracing system and the support piles are driven into the soil by the power unit before large-scale excavation, avoiding secondary excavation required with traditional inclined bracing systems. The pile tip is installed at the front end of the first steel pipe section to ensure the support pile is driven to a suitable ground depth. The upper end of the power unit is fixed to the angle connector, which can be adjusted according to the angle installation requirements of the inclined bracing system. The other end of the angle connector is fixed to the waler via clearance structures and reinforcing members, transmitting the reaction force of the power unit from the waler to the support structure and the soil behind it.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support engineering technology, specifically to a prefabricated inclined bracing and its construction method. Background Technology

[0002] With the advent of the era of large-scale development and utilization of underground space, foundation pit engineering is developing towards greater depth and larger area. As a temporary project, the foundation pit's mission ends once the underground structure is completed. The horizontal support system of a foundation pit includes an anchor system and an internal support system. The anchor system is generally anchored outside the foundation pit, which may affect the development of adjacent plots. The internal support system is generally arranged in the form of beams inside the foundation pit. It is erected or dismantled as the earthwork excavation and underground structure construction progresses. The setting of the internal support and its supporting structural columns restricts the working space for earthwork excavation, increases the difficulty of earthwork excavation, and prolongs the earthwork excavation cycle.

[0003] For foundation pits with large spans, inclined bracing is often used as an economical support structure. The advantage of inclined bracing is that it is only installed within a certain range adjacent to the vertical support structure, without affecting construction work in the middle area of ​​the foundation pit. However, the disadvantage is that a soil platform needs to be reserved in the area where it is installed. Construction of the inclined bracing can only begin after the middle area of ​​the foundation pit has been excavated to the base, and the reserved soil platform can only be removed after the inclined bracing is completed, increasing the difficulty of construction management. The supporting end of the inclined bracing can use temporary supports built on the foundation slab or pre-constructed pile foundations. When using temporary supports, the reserved soil platform under the inclined bracing can only be removed after the temporary supports have reached the design strength, thus increasing the construction period. When using pile foundations, the inclined bracing needs to penetrate the foundation slab, which makes the reinforcement construction of the foundation slab difficult and also affects the waterproofing quality of the foundation slab.

[0004] Therefore, it is necessary to propose a more optimized solution to the above problems. Summary of the Invention

[0005] To overcome the shortcomings of the aforementioned support systems and inclined bracing, this invention provides a prefabricated inclined bracing and its construction method, solving the problem of secondary excavation of earthwork in traditional inclined bracing, improving construction efficiency, and ensuring construction quality.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] The prefabricated inclined bracing is characterized in that: the prefabricated inclined bracing includes a lattice support section, a steel pipe section, a pile tip, a power unit, an angle connector, a clearance structure, a reinforcing member, and bolts;

[0008] The multiple lattice support sections are assembled with bolts to form a diagonal brace;

[0009] The multiple steel pipe sections are assembled with bolts and inserted into the soil layer below the foundation to form a support pile;

[0010] The pile tip is installed at the front end of the steel pipe section;

[0011] One end of the power unit is connected to a steel pipe section or a lattice support section to provide a pressing force for the steel pipe section to be inserted into the soil layer below the foundation.

[0012] The other end of the power unit is connected to the angle connector;

[0013] The angle connector is matched with the installation angle of the inclined brace;

[0014] The other end of the angle connector is connected to the clearance structure and the reinforcing member, respectively.

[0015] The avoidance structure and the reinforcement are both fixed to the waler, and the reaction force of the power unit is transmitted from the waler to the support structure and the soil behind it.

[0016] The lattice support section consists of a support body and support end plates;

[0017] The supporting body is composed of four symmetrically arranged lattice angle steels, with angle steel slots symmetrically opened at both the upper and lower ends of each lattice angle steel;

[0018] The support end plates are rectangular or circular and are arranged vertically at both ends of the support body.

[0019] The support end plate is provided with support connection holes and support grouting holes, and support ribs are provided facing the inner side of the support body;

[0020] The support connection holes are no less than three, and are arranged symmetrically along the centroid of the support end plate;

[0021] The grouting holes for the support are located at the centroid of the support end plate.

[0022] The support ribs are welded to the support end plates, avoiding the positions of the support connection holes and support grouting holes;

[0023] The supporting rib plate matches the angle steel slot and is inserted into the angle steel slot;

[0024] The contact area between the main support body and the support end plate is welded together to form a whole.

[0025] The length of the lattice support section does not exceed 3m.

[0026] The steel pipe section consists of a pipe section body and pipe section end plates;

[0027] The main body of the pipe section is a square steel pipe or a round steel pipe;

[0028] The main body of the pipe section has working ports and pipe section slots, which are symmetrically arranged at both ends of the main body of the pipe section.

[0029] The width and depth of the working opening are both not less than 50 mm;

[0030] The pipe section end plate is matched with the pipe section body and is rectangular or circular, and is arranged vertically at both ends of the pipe section body.

[0031] The pipe section end plate is provided with pipe section connection holes and pipe section grouting holes, and pipe section ribs are provided facing the inner side of the pipe section body;

[0032] The pipe section has no fewer than three connecting holes, which are symmetrically arranged along the centroid of the pipe section end plate.

[0033] The grouting holes of the pipe section are located at the centroid of the pipe section end plate.

[0034] The pipe section ribs are welded to the pipe section end plates, avoiding the positions of the pipe section connection holes and pipe section grouting holes;

[0035] The pipe section rib plate matches the pipe section slot and is inserted into the pipe section slot;

[0036] The contact area between the main body of the pipe section and the end plate of the pipe section is welded together as a whole.

[0037] The length of the steel pipe section shall not exceed 3m.

[0038] The pile tip consists of a pile tip body and a pile tip plate;

[0039] The main body of the pile tip is conical or cross-shaped;

[0040] The dimensions of the main body of the pile tip do not exceed those of the pile tip plate;

[0041] The center of the pile tip body coincides with the center of the pile tip plate and is connected by welding to the pile tip plate.

[0042] The pile tip plate has no fewer than three connection holes, which are symmetrically arranged along the centroid of the pile tip plate and match the positions of the pipe section connection holes.

[0043] The power unit consists of a jack, a front plate, and a rear plate;

[0044] The stroke of the jack shall not be less than 1 / 2 of the length of the lattice support section or the steel pipe section;

[0045] The front end plate has front end plate connection holes, and the position and diameter of the front end connection holes match the position and diameter of the support connection holes and the pipe section connection holes.

[0046] The back-end board has a back-end board connection hole.

[0047] The corner connector comprises an angle end plate, an angle rib plate, a top plate, and a side plate;

[0048] The angle end plate has corner connection holes, and the hole positions and diameters of the corner connection holes match the hole positions and diameters of the connection holes on the rear end plate of the power unit.

[0049] The angle of inclination of the end plate is perpendicular to the axis of the inclined brace;

[0050] The top plate has a top plate connection hole;

[0051] The side plate has a side plate connection hole;

[0052] The three sides of the angled rib are welded to the angled end plate, the top plate, and the side plate, respectively.

[0053] The construction of the avoidance structure is the same as that of the lattice support section.

[0054] The reinforcing member is made of angle steel, channel steel or H-beam steel and is welded or bolted to the corner connector, clearance structure and waler.

[0055] The construction method for the prefabricated inclined bracing includes the following steps:

[0056] S1. Fix the avoidance structural components to the waler by welding or rebar installation;

[0057] S2. Fix the angle connecting plate to the end of the avoidance structure with bolts, with the angle end plate of the angle connecting plate angled towards the inside of the pit.

[0058] S3. Secure the reinforcing member to the top of the waler, clearance structure, and corner connector;

[0059] S4. Fix the rear end plate of the power unit to the angle end plate;

[0060] S5. Take a steel pipe section, connect one end to the pile tip with bolts, and connect the other end to the front plate of the power unit with bolts.

[0061] S6. By applying pressure, the jack is continuously extended, and the steel pipe section and pile tip are pushed into the soil below until the jack reaches its stroke.

[0062] S7. Loosen the bolt connection between the front end plate and the end plate of the pipe section, return the jack to its original position, insert another steel pipe section between the front end plate and the end plate of the inserted steel pipe section, and connect it to the front end plate and the end plate of the pipe section with bolts respectively. Repeat step S6.

[0063] S8. Repeat step S7 until the length of the support pile composed of steel pipe sections reaches the design requirements.

[0064] S9. Loosen the bolt connection between the front end plate and the end plate of the pipe section, return the jack to its original position, insert a lattice support section between the front end plate and the end plate of the inserted steel pipe section, and connect it to the front end plate and the end plate of the pipe section with bolts respectively.

[0065] S10. By applying pressure, the jack is continuously extended, and the lattice support section, steel pipe section and pile tip are pushed into the soil below until the jack reaches its stroke.

[0066] S11. Loosen the bolt connection between the front end plate and the support end plate, return the jack to its original position, insert another lattice support section between the front end plate and the support end plate of the jacked lattice support section, and connect it to the front end plate and the support end plate with bolts respectively. Repeat step S10.

[0067] S12. Repeat step S11 until the length of the inclined bracing composed of the lattice support section reaches the design requirements.

[0068] S13. Cement grout is continuously injected from the bottom of the support pile upwards through the grouting hole of the inclined brace and the grouting hole of the support pile to form a grouting body and reinforce the soil on the side of the support pile.

[0069] S14. Apply prestress to the inclined brace using a power unit.

[0070] Compared with the prior art, the present invention has the following advantages:

[0071] (1) All components of the prefabricated inclined bracing are prefabricated, ensuring product quality control and shortening the on-site construction period.

[0072] (2) The prefabricated inclined bracing can effectively penetrate into harder soil layers with a smaller pile driving force through the setting of power device and pile tip, without the need for large construction equipment, thus reducing construction costs;

[0073] (3) Prefabricated inclined bracing can be completed by gradually lengthening the steel pipe sections and lattice support sections, with only a small amount of over-excavation. This is conducive to construction organization and management and avoids secondary excavation of earthwork in the later stage.

[0074] (4) After the prefabricated inclined bracing is pressed into the design depth, the strength of the supporting pile body is improved by grouting, and the soil layer on the side of the supporting pile is reinforced to improve the bearing capacity of the supporting pile and provide a safe and stable support for the inclined bracing. Attached Figure Description

[0075] The accompanying drawings are provided to further explain the invention and form part of the invention. In the drawings:

[0076] Figure 1 This is a schematic diagram of the prefabricated inclined bracing structure described in this invention;

[0077] Figure 2 This is a schematic diagram of the pile tip structure described in this invention;

[0078] Figure 3 , Figure 4 This is a schematic diagram of the steel pipe section structure described in this invention;

[0079] Figure 5 , Figure 6 This is a schematic diagram of the lattice support section structure described in this invention;

[0080] Figure 7 This is a schematic diagram of the power device structure described in this invention;

[0081] Figure 8 This is a schematic diagram of the corner connector structure described in this invention;

[0082] Figure 9 This is a schematic diagram of the connection between the pile tip and the steel pipe section as described in this invention;

[0083] Figure 10 This is a schematic diagram of the connection between the lattice support section and the steel pipe section described in this invention;

[0084] Figure 11 This is a schematic diagram of the connection between the avoidance structure and the corner connector described in this invention;

[0085] Figure 12 This is a schematic diagram of the connection between the corner connector and the power device described in this invention;

[0086] Figure 13 This is a schematic diagram showing the connection between the power unit and the steel pipe section described in this invention;

[0087] Figure 14 This is a schematic diagram showing the connection between the power unit and the lattice support section described in this invention;

[0088] Figures 15-24 This is a schematic diagram of the prefabricated inclined bracing construction method described in this invention;

[0089] Figure 25 This is a schematic diagram of the prefabricated inclined bracing support structure described in this invention being excavated to the bottom of the foundation pit;

[0090] Figure 26 This is a schematic diagram of the prefabricated inclined brace described in this invention after it is removed at the end of its service life.

[0091] Code explanations in the diagram: 1-Pile tip; 111-Pile tip body; 112-Pile tip plate; 113-Pile tip connection hole; 2-Steel pipe section; 21-Pipe section body; 211-Working port; 212-Pipe section slot; 22-Pipe section end plate; 221-Pipe section connection hole; 222-Pipe section grouting hole; 223-Pipe section rib; 3-Lattice support section; 31-Lattice body; 311-Lattice angle steel; 312-Lattice slot; 32-Support end plate; 321-Lattice connection hole; 322-Lattice grouting hole; 323-Lattice... 4-Rib plate; 5-Power unit; 6-Jack; 7-Front end plate; 8-Rear end plate; 9-Front end plate; 10-Vertical support structure; 11-Grouting body; 12-Basement structure; 13-Force transmission plate. Detailed Implementation

[0092] To make the technical problems, solutions, and beneficial effects of this invention clearer and more understandable, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0093] like Figure 1 As shown, the prefabricated inclined bracing consists of pile tip 1, steel pipe section 2, lattice support section 3, power unit 4, angle connector 5, bolt 6, avoidance structure 7, and reinforcing member 8.

[0094] like Figure 2 As shown, the pile tip 1 consists of a pile tip body 111, a pile tip plate 112, and a pile tip connecting hole 113.

[0095] like Figure 3 , Figure 4 As shown, the steel pipe section 2 is composed of a pipe section body 21 and a pipe section end plate 22; the pipe section body 21 has an operating port 211 and a pipe section slot 212; the pipe section end plate 22 is symmetrically arranged at both ends of the pipe section body 21, and the pipe section end plate 22 has a pipe section connection hole 221 and a pipe section grouting hole 222; the pipe section rib plate 223 faces the inside of the pipe section body 21 and is welded to the pipe section end plate 22.

[0096] like Figure 5 , Figure 6As shown, the lattice support section 3 consists of a lattice body 31 and a support end plate 32. The lattice body 31 consists of four lattice angle steels 311, each of which has a lattice slot 312. The support end plates 32 are symmetrically arranged at both ends of the pipe section body 31. The support end plates 32 have lattice connection holes 321 and lattice grouting holes 322. The lattice ribs 323 face the inside of the lattice body 31 and are welded to the pipe section end plates 32.

[0097] like Figure 7 As shown, the power unit 4 consists of a jack 41, a front plate 42, and a rear plate 43; the front plate 42 and the rear plate 43 are respectively provided with a front plate connection hole 421 and a rear plate connection hole 431.

[0098] like Figure 8 As shown, the corner connector 5 is welded together from an angle end plate 51, a top plate 52, a side plate 53, and an angle rib 54; the top plate 52 and the side plate 53 are respectively provided with a top plate connection hole 521 and a side plate connection hole 531.

[0099] like Figures 9-14 As shown, the components of the prefabricated inclined bracing are interconnected according to their usage. One end of the steel pipe section 2 can be connected to the pile tip 1, and the other end can be connected to other steel pipe sections 2 to form a support pile, or it can be connected to the lattice support section 3. One end of the lattice support section 3 can be connected to the steel pipe section 2, or it can be connected to other lattice support sections 3 to form an inclined bracing. The power device 4 can be connected to the steel pipe section 2 for jacking in the support pile, or it can be connected to the lattice support section 3 for jacking in the inclined bracing. The other end of the power device 4 is connected to the corner connector 5, so that the steel pipe section 2 and the lattice support section 3 are jacked in a direction perpendicular to the angle end plate 51 of the corner connector 5. One end of the angle connector 5 is connected to the power device 4, and the other end is connected to the avoidance structure 7. One end of the avoidance structure 7 is connected to the angle connector 5, and the other end is connected to the waler 9. The reinforcing member 8 is arranged above the angle connector 5 and the avoidance structure 7 and is connected to the waler 9.

[0100] like Figures 15-24 As shown, the construction steps for prefabricated inclined bracing are as follows:

[0101] S1. Fix the avoidance structural component 7 to the waler 9 by welding or rebar installation;

[0102] S2. Fix the angle connecting plate 5 to the end of the avoidance structure 7 with bolts 6. The angle end plate 51 of the angle connecting plate 5 is inclined to the inside of the pit.

[0103] S3. Fix the reinforcing member 8 above the waler 9, the clearance structure 7, and the corner connector 5;

[0104] S4. Fix the rear end plate 43 of the power unit 4 to the angle end plate 51;

[0105] S5. Take a steel pipe section 2, connect one end of it to the pile tip 1 with bolt 6, and connect the other end of it to the front plate 42 of the power device 4 with bolt 6.

[0106] S6. By applying pressure, the jack 41 is continuously extended, and the steel pipe section 2 and the pile tip 1 are pushed into the soil below until the jack 42 reaches its stroke.

[0107] S7. Unscrew the bolts connecting the front end plate 42 and the pipe section end plate 22, return the jack 41, insert another steel pipe section 2 between the front end plate 42 and the pipe section end plate 22 of the inserted steel pipe section 2, and connect it to the front end plate 42 and the pipe section end plate 22 with bolts 6 respectively, and repeat step S6.

[0108] S8. Repeat step S7 until the length of the support pile composed of steel pipe section 2 reaches the design requirements.

[0109] S9. Release the bolt connection between the front end plate 42 and the pipe section end plate 22, return the jack 41, insert a lattice support section 3 between the front end plate 42 and the pipe section end plate 22 of the inserted steel pipe section 2, and connect it to the front end plate 42 and the pipe section end plate 22 respectively with bolts 6.

[0110] S10. By applying pressure, the jack 41 is continuously extended, and the lattice support section 3, steel pipe section 2 and pile tip 1 are pushed into the soil below until the jack 41 reaches its stroke.

[0111] S11. Unscrew the bolts connecting the front end plate 42 and the support end plate, return the jack to its original position, insert another lattice support section 3 between the front end plate and the support end plate 32 of the jacked lattice support section, and connect it to the front end plate 42 and the support end plate 32 with bolts 6 respectively. Repeat step S10.

[0112] S12. Repeat step S11 until the length of the inclined bracing composed of lattice support section 3 reaches the design requirements.

[0113] S13. Cement grout is continuously injected from the bottom of the support pile upwards through the grouting hole 322 of the inclined brace and the grouting hole 222 of the support pile to form a grouting body 11, which reinforces the soil on the side of the support pile.

[0114] S14. Apply prestress to the inclined brace through the power unit 4 to complete the installation of the prefabricated inclined brace.

[0115] like Figure 25 Once the prefabricated inclined bracing is installed, the excavation of the foundation pit can continue downwards until the base is reached.

[0116] like Figure 26After the foundation pit is excavated to the bottom, the basement structure 12 is constructed. The basement structure 12 is constructed to the designed dismantling condition. The prefabricated inclined bracing reaches the designed service life. A force transfer plate 13 is installed between the vertical support structure 10 and the basement structure 12. After the force transfer plate 13 reaches the design strength, the prefabricated inclined bracing can be dismantled.

[0117] The above provides a detailed description of the solutions provided by the embodiments of the present invention. For those skilled in the art, based on the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. The scope of protection of the present invention is not limited to the technical solutions mentioned in this embodiment; any technical solution inspired by the present invention falls within the protection scope of the present invention.

Claims

1. A prefabricated inclined throw support, mainly used in foundation pit support engineering, characterized in that: The assembled inclined throw support comprises lattice support sections, steel pipe sections, pile tips, power devices, corner connecting pieces, avoidance structural pieces, reinforcing pieces and bolts; the multiple lattice support sections are assembled by bolts to form the inclined throw support; the multiple steel pipe sections are assembled by bolts and inserted into the soil layer below the base to form supporting piles; the pile tips are installed at the front ends of the steel pipe sections; one end of the power device is connected with the steel pipe section or the lattice support section to provide the pressure force for the insertion of the steel pipe section into the soil layer below the base; the other end of the power device is connected with the corner connecting piece; the corner connecting piece matches the installation angle of the inclined throw support; the other end of the corner connecting piece is connected with the avoidance structural piece and the reinforcing piece respectively; the avoidance structural piece and the reinforcing piece are fixed on the surrounding purlin and transmit the reaction force of the power device to the supporting structure and the soil body behind the supporting structure; the lattice support section is composed of a support main body and a support end plate; the support main body is composed of four symmetrically arranged lattice angle steels; angle steel clamping grooves are symmetrically formed at the upper and lower ends of each lattice angle steel; the support end plate is rectangular or circular and arranged at the two ends of the support main body; support connecting holes and support grouting holes are formed in the support end plate and support rib plates are arranged towards the inner side of the support main body; the support connecting holes are not less than three and symmetrically arranged along the centroid of the support end plate; the support grouting holes are arranged at the centroid of the support end plate; the support rib plates are welded on the support end plate and avoid the positions of the support connecting holes and the support grouting holes; the support rib plates match the angle steel clamping grooves and are clamped into the angle steel clamping grooves; the contact areas of the support main body and the support end plate are connected as a whole by welding; the length of the lattice support section is not more than 3m; the steel pipe section is composed of a pipe section main body and a pipe section end plate; the pipe section main body is a square steel pipe or a round steel pipe; working openings and pipe section clamping grooves are formed in the pipe section main body and symmetrically arranged at the two ends of the pipe section main body; the width and depth of the working openings are not less than 50mm; the pipe section end plate matches the pipe section main body and is rectangular or circular and arranged at the two ends of the pipe section main body; pipe section connecting holes, pipe section grouting holes and pipe section rib plates are formed in the pipe section end plate and arranged towards the inner side of the pipe section main body; the pipe section connecting holes are not less than three and symmetrically arranged along the centroid of the pipe section end plate; the pipe section grouting holes are arranged at the centroid of the pipe section end plate; the pipe section rib plates are welded on the pipe section end plate and avoid the positions of the pipe section connecting holes and the pipe section grouting holes; the pipe section rib plates match the pipe section clamping grooves and are clamped into the pipe section clamping grooves; the contact areas of the pipe section main body and the pipe section end plate are connected as a whole by welding; the length of the steel pipe section is not more than 3m.

2. The prefabricated inclined throw support according to claim 1, characterized in that: The pile tip is composed of a pile tip main body and a pile tip end plate; the pile tip main body is conical or cross-shaped; the size of the pile tip main body is not more than that of the pile tip end plate; the center of the pile tip main body coincides with the center of the pile tip end plate and is connected by welding; the connecting holes of the pile tip end plate are not less than three, symmetrically arranged along the centroid of the pile tip end plate and matched with the positions of the pipe section connecting holes.

3. The prefabricated inclined throw support according to claim 1, characterized in that: The power device is composed of a jack, a front end plate and a rear end plate; the stroke of the jack is not less than 1 / 2 of the length of a latticed support section or a steel pipe section; the front end plate is provided with front end plate connecting holes; the position and diameter of the front end plate connecting holes are matched with the position and diameter of the support connecting holes and the pipe section connecting holes; the rear end plate is provided with rear end plate connecting holes.

4. The fabricated battering rafter of claim 1, wherein: The corner connecting piece is composed of a corner end plate, a corner rib plate, a top plate and a side plate; the corner end plate is provided with corner connecting holes; the position and diameter of the corner connecting holes are matched with the position and diameter of the rear end plate connecting holes of the power device; the inclined angle of the corner end plate is perpendicular to the axis of the inclined throw support; the top plate is provided with top plate connecting holes; the side plate is provided with side plate connecting holes; three edges of the corner rib plate are welded with the corner end plate, the top plate and the side plate respectively.

5. The prefabricated inclined throw support according to claim 1, characterized in that: The structure of the avoiding structure piece is the same as that of the latticed support section.

6. The prefabricated inclined throw support according to claim 1, characterized in that: The reinforcing piece is an angle steel, a channel steel or an H-shaped steel processed, and is welded or bolted with the corner connecting piece, the avoiding structure piece and the surrounding purlin.

7. The construction method of the assembled inclined throw support according to any one of claims 1-6, characterized in that, It comprises The following steps: S1, fixing the avoiding structure piece on the surrounding purlin by welding or anchoring; S2, fixing the corner connecting plate on the end of the avoiding structure piece by bolts, and the corner end plate of the corner connecting piece is inclined to the inner side of the foundation pit; S3, fixing the reinforcing piece above the surrounding purlin, the avoiding structure piece and the corner connecting piece; S4, fixing the rear end plate of the power device on the corner end plate; S5, taking a steel pipe section, one end of which is connected with the pile tip by bolts, and the other end is connected with the front end plate of the power device by bolts; S6, continuously extending the jack by pressurizing, and driving the steel pipe section and the pile tip into the underlying soil until the jack reaches its stroke; S7, releasing the bolt connection between the front end plate and the pipe section end plate, returning the jack, inserting another steel pipe section between the front end plate and the pipe section end plate of the driven steel pipe section, and connecting them with the front end plate and the pipe section end plate by bolts respectively, and repeating step S6; S8, repeating step S7 until the length of the support pile composed of the steel pipe sections reaches the design requirement; S9, releasing the bolt connection between the front end plate and the pipe section end plate, returning the jack, inserting a latticed support section between the front end plate and the pipe section end plate of the driven steel pipe section, and connecting them with the front end plate and the pipe section end plate by bolts respectively; S10, continuously extending the jack by pressurizing, and driving the latticed support section, the steel pipe section and the pile tip into the underlying soil until the jack reaches its stroke; S11, repeating step S10 until the length of the inclined throw support composed of the latticed support sections reaches the design requirement; S12, repeating step S11 until the length of the inclined throw support composed of the latticed support sections reaches the design requirement; S13, continuously injecting cement slurry from the bottom of the support pile along the support pile to form a grouting body and reinforce the soil around the support pile through the support grouting holes and the pipe section grouting holes of the support pile; S14, applying prestress to the inclined throw support by the power device.

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