Support pile foundation pit supporting device for civil engineering and use method thereof

Abstract

The application relates to a supporting pile foundation pit supporting device for civil engineering and a using method thereof, and aims to solve the technical problem of low connection strength of a foundation pit supporting pile and a foundation pit, and comprises an auxiliary base, a main pile body, a movable sleeve pile, auxiliary sleeve piles, a clamping mechanism, a meshing rod and auxiliary nails; the main pile body is arranged in the middle end of the auxiliary base, the movable sleeve pile is arranged on the outer wall of the main pile body, and the auxiliary sleeve piles are arranged below the movable sleeve pile through connecting rods, wherein the gaps between the main pile body and the movable sleeve pile and the auxiliary sleeve piles form a placing cavity, and two clamping mechanisms are symmetrically arranged in the placing cavity. The movable sleeve pile and the auxiliary sleeve pile are arranged to move downwards to make the multiple clamping mechanisms extrude to both sides, the clamping mechanism is used to mesh with the bottom of the foundation pit, so that the connection strength of the supporting pile is improved, and the rotation, falling and loosening are reduced.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and in particular to a support pile foundation pit support device for civil engineering and its usage method. Background Technology

[0002] Civil engineering refers to the planning, construction, and maintenance of all infrastructure related to water, soil, and culture. Currently, general civil engineering projects include: houses, roads, waterworks, canals, flood control projects, and transportation, including the construction of residential buildings, public buildings, and structures, such as dewatering, earthwork, foundation laying, and the pouring and masonry of retaining structures such as columns, beams, slabs, and walls, as well as supporting reinforcement and simple decoration. During the construction of civil engineering projects, a large number of support piles are required, which are used as the foundation for engineering construction.

[0003] Existing foundation pit support pile devices are driven into the foundation pit floor by impact. To facilitate the insertion of the support piles into the foundation pit floor, the conventional shape is cylindrical with a pointed bottom. However, the connection strength between the support piles and the foundation pit floor is low, and the support piles are prone to rotation, detachment, and loosening. Therefore, how to propose a foundation pit support device with high connection strength is needed. In view of this, we propose a foundation pit support device for civil engineering using support piles. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide a foundation pit support device for civil engineering using retaining piles, so as to solve the technical problem of low connection strength between existing foundation pit support piles and foundation pits. To achieve the purpose of this invention, the technical solution adopted by this invention is as follows: a foundation pit support device for civil engineering using retaining piles is designed, including an auxiliary base, a main pile body, a movable sleeve, an auxiliary sleeve, an interlocking mechanism, a meshing rod, and an auxiliary nail; the main pile body is inserted through the middle of the auxiliary base, the movable sleeve is arranged on the outer wall of the main pile body, and the auxiliary sleeve is arranged below the movable sleeve through a connecting rod. The main pile body, the movable sleeve, and the auxiliary sleeve are respectively arranged in a placement cavity by gaps. Two interlocking mechanisms are centrally symmetrically arranged in the placement cavity. At least one meshing rod is arranged on the auxiliary base through a hinge seat and connected to the movable sleeve. The auxiliary nail is inclined and inserted through the auxiliary base and the meshing rod. The movable sleeve, the auxiliary sleeve, the interlocking mechanism, and the main pile body constitute a foundation pit interlocking structure. This invention uses movable sleeves and auxiliary sleeves to descend and move, causing multiple interlocking mechanisms to press against both sides. These interlocking mechanisms engage with the bottom of the foundation pit, thereby improving the connection strength of the support piles and reducing the occurrence of rotation, detachment, and loosening.

[0005] Preferably, two reinforcing ribs are provided on both sides of the main pile, the movable sleeve, and the auxiliary sleeves. In this invention, the main pile, the movable sleeve, and the auxiliary sleeves are approximately cylindrical in shape. To effectively coordinate with the interlocking mechanism and the linkage of the auxiliary sleeves, the main pile is centrally controlled. By providing reinforcing ribs on both sides of the main pile, the movable sleeve, and the auxiliary sleeves, the overall rigidity of the main pile, the movable sleeve, and the auxiliary sleeves is improved, reducing the likelihood of breakage and increasing the service life of the support piles.

[0006] Preferably, the main pile body includes a column pile body, an operating connection groove, a connecting block A, and auxiliary blocks; the column pile body passes through the middle of the auxiliary base, wherein the column pile body is fixedly connected to the auxiliary base, the operating connection groove is formed inside the column pile body, wherein the operating connection groove communicates with the placement cavity, two connecting blocks A are symmetrically arranged on the column pile body, wherein the end of the connecting block A is triangular, and several auxiliary blocks are symmetrically arranged below the connecting block A. This invention, by connecting the operating connection groove to the placement cavity, allows the auxiliary sleeves to be connected to the movable sleeves via connecting rods, facilitating the simultaneous operation of multiple auxiliary sleeves through the movable sleeves and improving operational efficiency.

[0007] Furthermore, the movable sleeve includes a sleeve A and a meshing tooth A; the sleeve A is sleeved on the outside of the column body and connected to the auxiliary base, wherein the sleeve A is slidably engaged with the column body, and the meshing tooth A is arranged on both sides of the sleeve A and connected to the meshing rod.

[0008] Preferably, the auxiliary casing includes casing B and connecting block B; a plurality of casings B are sequentially arranged below the column pile body via connecting rods and connected to the operating connecting groove; two connecting blocks B are symmetrically arranged on the casings B; wherein the gaps between the connecting rods, connecting blocks B, casings B, connecting blocks A, and the main pile body form a movable cavity, and the movable cavity is wider on the outside and narrower on the inside. This invention... Figure 5 The diagram shows a movable cavity with a wide outer surface and a narrow inner surface, formed by connecting rods, connecting block B, sleeve B, connecting block A, and the outer wall of the main pile. When the connecting block A, with its triangular end, is used to dismantle the support pile, it can guide the soil in the foundation pit to apply external pressure, reducing the chance of soil getting stuck in the movable cavity. This allows the movable sleeve to rise until the interlocking mechanism is fully retracted, facilitating the separation of the support pile from the foundation pit.

[0009] Preferably, the biting mechanism includes a first biting block and a second biting block; the first biting block is arranged in the placement cavity, wherein two baffles A are fixedly provided on one side of the outer wall of the first biting block, and the second biting block is hinged to the end of the first biting block by a connecting rod, wherein two baffles B are fixedly provided on one side of the outer wall of the second biting block, wherein the baffles A and B are staggered and in contact with each other, wherein the baffles A and B are fan-shaped, and the ends of the baffles A and B away from the connecting rod are both chamfered, wherein the first biting block and the second biting block are U-shaped. This invention utilizes a first and second interlocking block, staggered and hinged in a U-shape, to allow the first and second interlocking blocks to rotate and form outward protrusions that engage with the soil in the foundation pit, thereby improving the connection strength of the support pile. Combined with fan-shaped baffles A and B, the first and second interlocking blocks shield the sides of the protrusions, reducing the likelihood of soil entering the main pile, movable sleeve, and auxiliary sleeve, thus preventing the movable sleeve and auxiliary sleeve from sliding. Furthermore, the chamfered ends of baffles A and B away from the connecting rod allow the two centrally symmetrically arranged interlocking mechanisms to be staggered within the confined space, preventing contact between the two sets of baffles A and B.

[0010] Preferably, the meshing rod includes a limiting adjustment block, a meshing block, and a handle; the limiting adjustment block is arranged on the auxiliary base via a hinge, wherein the limiting adjustment block is movably connected to the hinge, the meshing block is arranged at one end of the limiting adjustment block and connected to the meshing tooth A, and the handle is arranged at the other end of the limiting adjustment block; wherein the auxiliary pin is obliquely inserted through the end of the handle and connected to the auxiliary base, wherein the limiting adjustment block, the meshing block, the handle, and the hinge constitute a movable lever structure. This invention, through the setting of the limiting adjustment block and the meshing block, allows the movable sleeve to be engaged by manually gripping the handle. The lever structure of the meshing rod and the hinge allows for adjustment of the moving sleeve's ascent and descent, and simultaneously, after descent, the movable sleeve is fixed... Figure 3 , Figure 4 As shown, manually bring the end of the handle into contact with the auxiliary base, and push the engagement rod to make the engagement block engage with the engagement tooth A. Use the inclined auxiliary nail to reconnect the engagement rod, the auxiliary base and the pit. At the same time, limit the engagement rod to prevent the movable sleeve from loosening and rising.

[0011] A method for using a support pile foundation pit support device for civil engineering includes the following steps:

[0012] S100: Impact treatment: Insert the support device into the pit by machine or manual labor;

[0013] S200: Adjustment process, by manually stretching the two sides of the meshing rod externally, so that the limit adjustment block fits against one end of the inner wall of the hinge seat;

[0014] S300: Meshing process, the meshing rod is manually rotated to make the meshing block engage with the meshing tooth A, the meshing block is used to press down the movable sleeve, the movable sleeve drives the auxiliary sleeve to descend, causing the meshing mechanism to rotate and form an outward protrusion to mesh with the soil in the foundation pit.

[0015] S400: Secondary reinforcement treatment. The meshing rod is manually pushed inward, so that the meshing rod drives the meshing block to mesh with the meshing tooth A, and the handle end fits into the auxiliary base. The meshing rod, auxiliary base and pit are reconnected with the inclined auxiliary nail, and the meshing rod is limited at the same time.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. This invention uses movable sleeves and auxiliary sleeves to descend and move, so that multiple interlocking mechanisms are squeezed to both sides. The interlocking mechanisms are used to engage with the bottom of the foundation pit, thereby improving the connection strength of the support piles and reducing the occurrence of rotation, falling off, and loosening.

[0018] 2. The present invention connects the auxiliary sleeve to the placement cavity via an operating connecting groove, allowing the auxiliary sleeve to be connected to the movable sleeve via a connecting rod. This facilitates the simultaneous operation of multiple auxiliary sleeves through the movable sleeve, thereby improving operational efficiency.

[0019] 3. The present invention as follows Figure 5 The diagram shows a movable cavity with a wide outer surface and a narrow inner surface, formed by connecting rods, connecting block B, sleeve B, connecting block A, and the outer wall of the main pile. When the connecting block A, with its triangular end, is used to dismantle the support pile, it can guide the soil in the foundation pit to apply external pressure, reducing the chance of soil getting stuck in the movable cavity. This allows the movable sleeve to rise until the interlocking mechanism is fully retracted, facilitating the separation of the support pile from the foundation pit.

[0020] 4. This invention uses staggered and hinged first and second interlocking blocks in a U-shape, allowing them to rotate and form outward protrusions that engage with the soil in the foundation pit, thus improving the connection strength of the support pile. Combined with fan-shaped baffles A and B, the first and second interlocking blocks shield the sides of the protrusions, reducing the likelihood of soil entering the main pile, movable sleeve, and auxiliary sleeve, preventing them from sliding. Furthermore, the chamfered ends of baffles A and B away from the connecting rod allow the two centrally symmetrically arranged interlocking mechanisms to be staggered within the confined space, preventing contact between the two sets of baffles A and B.

[0021] 6. This invention, through the setting of a limit adjustment block and its cooperation with an engagement block, allows the movable sleeve to be engaged manually by gripping the handle. The engagement rod and hinge lever structure are used to adjust the upward and downward movement of the movable sleeve. Furthermore, after lowering, the movable sleeve is fixed simultaneously... Figure 3 , Figure 4 As shown, manually bring the end of the handle into contact with the auxiliary base, and push the engagement rod to make the engagement block engage with the engagement tooth A. Use the inclined auxiliary nail to reconnect the engagement rod, the auxiliary base and the pit. At the same time, limit the engagement rod to prevent the movable sleeve from loosening and rising. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the main pile body of the present invention.

[0024] Figure 3 This is a schematic diagram of the mounting structure of the biting mechanism of the present invention.

[0025] Figure 4 For the present invention Figure 3 A magnified schematic diagram of a portion of the structure at point A.

[0026] Figure 5 For the present invention Figure 3 A magnified structural diagram of section B in the middle.

[0027] Figure 6 This is a three-dimensional structural diagram of the biting mechanism of the present invention.

[0028] In the diagram: 1. Auxiliary base; 2. Main pile body; 3. Movable sleeve; 4. Auxiliary sleeve; 5. Engaging mechanism; 6. Engaging rod; 7. Auxiliary nail;

[0029] 201. Column pile body; 202. Operating connection groove; 203. Connecting block A; 204. Auxiliary block;

[0030] 301. Sleeve A; 302. Engaging tooth A;

[0031] 401. Piling B; 402. Connecting block B;

[0032] 501. First occlusal block; 502. Second occlusal block;

[0033] 601. Limit adjustment block; 602. Engaging block; 603. Handle. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0035] Example 1: A support pile foundation pit support device for civil engineering, see [link / reference] Figures 1 to 6 The structure includes an auxiliary base 1, a main pile 2, a movable sleeve 3, an auxiliary sleeve 4, an interlocking mechanism 5, an interlocking rod 6, and an auxiliary nail 7. The main pile 2 is inserted through the middle of the auxiliary base 1, the movable sleeve 3 is arranged on the outer wall of the main pile 2, and the auxiliary sleeve 4 is arranged below the movable sleeve 3 via a connecting rod. The main pile 2, the movable sleeve 3, and the auxiliary sleeve 4 form a placement cavity with gaps between them. Two interlocking mechanisms 5 are symmetrically arranged in the placement cavity. At least one interlocking rod 6 is arranged in the auxiliary base 1 via a hinge seat and connects to the movable sleeve 3. The auxiliary nail 7 is inclined and inserted through the auxiliary base 1 and the interlocking rod 6. The movable sleeve 3, the auxiliary sleeve 4, the interlocking mechanism 5, and the main pile 2 constitute the pit interlocking structure. The present invention uses the movable sleeve 3 and the auxiliary sleeve 4 to descend and move so that multiple interlocking mechanisms 5 are squeezed to both sides. The interlocking mechanisms 5 are used to engage with the bottom of the foundation pit, thereby improving the connection strength of the support piles and reducing the occurrence of rotation, falling off, and loosening.

[0036] The main pile body 2, the movable sleeve pile 3, and the auxiliary sleeve piles 4 are all provided with two reinforcing ribs on both sides. In this invention, the main pile body 2, the movable sleeve pile 3, and the auxiliary sleeve piles 4 are approximately cylindrical in shape. To effectively coordinate with the interlocking mechanism 5 for adjustment and to ensure the linkage of the auxiliary sleeve piles 4, the main pile body 2 is centrally controlled. By providing reinforcing ribs on both sides of the main pile body 2, the movable sleeve pile 3, and the auxiliary sleeve piles 4, the overall rigidity of the main pile body 2, the movable sleeve pile 3, and the auxiliary sleeve piles 4 is improved, reducing the possibility of breakage and increasing the service life of the support piles.

[0037] The main pile body 2 includes a column pile body 201, an operating connection groove 202, a connecting block A203, and auxiliary blocks 204. The column pile body 201 is inserted through the middle of the auxiliary base 1, and is fixedly connected to the auxiliary base 1. The operating connection groove 202 is formed inside the column pile body 201 and communicates with the placement cavity. Two connecting blocks A203 are symmetrically arranged on the column pile body 201, with the ends of the connecting blocks A203 being triangular. Several auxiliary blocks 204 are symmetrically arranged below the connecting blocks A203. This invention, by connecting the operating connection groove 202 to the placement cavity, allows the auxiliary sleeve pile 4 to be connected to the movable sleeve pile 3 via a connecting rod, facilitating the simultaneous operation of multiple auxiliary sleeve piles 4 through the movable sleeve pile 3 and improving operational efficiency.

[0038] The movable sleeve 3 includes a sleeve A301 and a meshing tooth A302; the sleeve A301 is sleeved on the outside of the column pile body 201 and connected to the auxiliary base 1, wherein the sleeve A301 and the column pile body 201 are in sliding fit, and the meshing tooth A302 is arranged on both sides of the sleeve A301 and connected to the meshing rod 6.

[0039] It should be noted that the auxiliary sleeve pile 4 includes a sleeve pile B401 and a connecting block B402; a number of sleeve piles B401 are arranged under the column pile body 201 in sequence through connecting rods to connect the operation connecting groove 202, and two connecting blocks B402 are symmetrically arranged on the sleeve pile B401. Among them, an activity cavity is formed by the connecting rod, the connecting block B402, the sleeve pile B401, the connecting block A203, and the gap between the main pile body 2, and the activity cavity is wide outside and narrow inside. As shown in Figure 5 the present invention uses the connecting rod, the connecting block B402, the sleeve pile B401, the connecting block A203, and the outer wall of the main pile body 2 to form an activity cavity that is wide outside and narrow inside. When disassembling the support pile, the connecting block A203 with a triangular end can apply an outward extrusion force to guide the foundation pit soil, reducing the situation where the soil gets stuck in the activity cavity, so that the movable sleeve pile 3 can rise until the biting mechanism 5 is completely retracted, facilitating the detachment of the support pile from the foundation pit.

[0040] It should be noted that the biting mechanism 5 includes a first biting block 501 and a second biting block 502; the first biting block 501 is arranged in the placement cavity. Among them, two baffles A are fixedly arranged on one side of the outer wall of the first biting block 501, and the second biting block 502 is hinged to the end of the first biting block 501 through a connecting rod. Among them, two baffles B are fixedly arranged on one side of the outer wall of the second biting block 502. Among them, the baffle A and the baffle B are arranged in an alternating manner, and the baffle A and the baffle B are in contact with each other. Among them, the baffle A and the baffle B are fan-shaped, and chamfering treatments are performed on the ends of the baffle A and the baffle B away from the connecting rod. Among them, the first biting block 501 and the second biting block 502 are in a U-shaped state. Through the first biting block 501 and the second biting block 502 that are arranged in an alternating manner and hinged in a U-shaped state, the first biting block 501 and the second biting block 502 can rotate to form an outward protrusion to mesh with the foundation pit soil, improving the connection strength of the support pile. The fan-shaped baffles A and B cooperate with the first biting block 501 and the second biting block 502 to block both sides of the protrusion, reducing the situation where soil enters the main pile body 2, the movable sleeve pile 3, and the auxiliary sleeve pile 4, resulting in the inability of the movable sleeve pile 3 and the auxiliary sleeve pile 4 to slide. At the same time, chamfering treatments are performed on the ends of the baffle A and the baffle B away from the connecting rod, so that the two sets of symmetrically arranged biting mechanisms 5 can be misaligned in the limited placement cavity, avoiding the mutual contact of the two sets of baffles A and B.

[0041] In addition, the engagement rod 6 includes a limiting adjustment block 601, an engagement block 602, and a handle 603. The limiting adjustment block 601 is arranged on the auxiliary base 1 via a hinge, wherein the limiting adjustment block 601 is movably connected to the hinge, the engagement block 602 is arranged at one end of the limiting adjustment block 601 and connected to the engagement tooth A302, and the handle 603 is arranged at the other end of the limiting adjustment block 601. An auxiliary pin 7 is obliquely inserted through the end of the handle 603 and connected to the auxiliary base 1. The limiting adjustment block 601, engagement block 602, handle 603, and hinge constitute a movable lever structure. This invention, through the setting of the limiting adjustment block 601 and the engagement block 602, allows the movable sleeve 3 to be engaged by manually gripping the handle 603. The lever structure of the engagement rod 6 and hinge allows for adjustment of the upward and downward movement of the movable sleeve 3. Furthermore, after downward movement, the movable sleeve 3 is fixed simultaneously... Figure 3 , Figure 4 As shown, manually bring the end of the handle 603 into contact with the auxiliary base 1, and push the meshing rod 6 to make the meshing block 602 engage with the meshing tooth A302. With the help of the inclined auxiliary nail 7, the meshing rod 6, the auxiliary base 1 and the pit are reconnected. At the same time, the meshing rod 6 is limited to prevent the movable sleeve 3 from loosening and rising.

[0042] Example 2: A method for using a support pile foundation pit support device for civil engineering, comprising the following steps.

[0043] S100: Impact treatment: Insert the support device into the pit by machine or manual labor;

[0044] S200: Adjustment process, by manually stretching the two sides of the meshing rod 6 externally, so that the limit adjustment block 601 fits against one end of the outer side of the inner wall of the hinge seat;

[0045] S300: Engagement process, by manually rotating the engagement rod 6 to make the engagement block 602 engage with the engagement tooth A302, the engagement block 602 presses down on the movable sleeve 3, the movable sleeve 3 drives the auxiliary sleeve 4 to descend, causing the engagement mechanism 5 to rotate and form an outward protrusion to engage with the soil in the foundation pit.

[0046] S400: Secondary reinforcement treatment, through manual methods such as... Figure 3 , Figure 4 As shown, the engagement rod 6 is pushed inward, causing the engagement rod 6 to drive the engagement block 602 to engage with the engagement tooth A302, and the end of the handle 603 to fit against the auxiliary base 1. The engagement rod 6, the auxiliary base 1 and the pit are reconnected by the inclined auxiliary nail 7, and the engagement rod 6 is limited at the same time.

[0047] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A support pile foundation support device for civil engineering, characterized by, Include: Auxiliary base (1), main pile body (2), end through the auxiliary base (1); The movable sleeve pile (3) is arranged on the outer wall of the main pile body (2); Auxiliary sleeve pile (4), arranged below the movable sleeve pile (3) through connecting rod, wherein the main pile body (2) is respectively and movable sleeve pile (3), auxiliary sleeve pile (4) clearance cavity; Two occlusion mechanism (5), center symmetry is arranged in the cavity; At least one engagement rod (6), through the hinge base is arranged in the auxiliary base (1) connecting the movable sleeve pile (3); Auxiliary nail (7), inclined structure through the auxiliary base (1), engagement rod (6) in, wherein the movable sleeve pile (3), auxiliary sleeve pile (4) and occlusion mechanism (5), main pile body (2) constitute the pit engagement structure; The main pile body (2) comprises: pile body (201), through the auxiliary base (1) end, wherein the pile body (201) is fixedly connected with the auxiliary base (1); Operation connection groove (202) is arranged in the pile body (201), wherein the operation connection groove (202) is communicated with the cavity; Two connecting blocks A (203) are symmetrically arranged on the pile body (201); wherein the end of the connecting block A (203) is triangular; A plurality of auxiliary blocks (204) are symmetrically arranged below the connecting block A (203); The movable sleeve pile (3) comprises: sleeve pile A (301), which is coupled to the auxiliary base (1) outside the pile body (201), wherein the sleeve pile A (301) is in sliding fit with the pile body (201); The engagement tooth A (302) is arranged on both sides of the sleeve pile A (301) and connected with the engagement rod (6); The auxiliary sleeve pile (4) comprises: a plurality of sleeve piles B (401) arranged in sequence below the pile body (201) through connecting rods and connected with the operation connection groove (202); Two connecting blocks B (402) are symmetrically arranged on the sleeve pile B (401), wherein the connecting rod, the connecting block B (402), the sleeve pile B (401), the connecting block A (203) and the main pile body (2) form an active cavity, and the active cavity is wide outside and narrow inside; The occlusion mechanism (5) comprises: a first occlusion block (501) arranged in the cavity, wherein two baffles A are fixedly arranged on one side of the outer wall of the first occlusion block (501); The second occlusion block (502) is hingedly connected to the end of the first occlusion block (501) through a connecting rod, wherein two baffles B are fixedly arranged on one side of the outer wall of the second occlusion block (502), wherein the baffles A and the baffles B are staggered, and the baffles A and the baffles B are in close contact, wherein the baffles A and the baffles B are fan-shaped, and the ends of the baffles A and the baffles B away from the connecting rod are chamfered. The engaging rod (6) comprises: a limiting adjusting block (601) arranged on the auxiliary base (1) through a hinge base, wherein the limiting adjusting block (601) is movably connected with the hinge base; an engaging block (602) arranged at one end of the limiting adjusting block (601) and connected with the engaging tooth A (302); and a handle (603) arranged at the other end of the limiting adjusting block (601), wherein the auxiliary nail (7) is arranged in an inclined manner at the end of the handle (603) and connected with the auxiliary base (1), and wherein the limiting adjusting block (601), the engaging block (602) and the handle (603) and the hinge base form a movable lever structure.

2. A retaining pile foundation support device for civil engineering as set forth in claim 1, characterized by The main pile body (2), the movable sleeve pile (3) and the auxiliary sleeve piles (4) are provided with two reinforcing ribs on both sides.

3. A method of using a support pile excavation support device for civil engineering according to claim 2, characterized by, The method comprises the following steps: S100: hitting processing: inserting the supporting device into the foundation pit by machine or manually; S200: adjusting processing: manually stretching the two sides of the engaging rod (6) outside to make the limiting adjusting block (601) adhere to one end of the outer side wall of the hinge base; S300: engaging processing: manually rotating the engaging rod (6) to make the engaging block (602) engage with the engaging tooth A (302), and using the engaging block (602) to press down the movable sleeve pile (3), so that the movable sleeve pile (3) drives the auxiliary sleeve pile (4) to descend to make the engaging mechanism (5) rotate to form an outward convex to engage with the soil of the foundation pit; S400: secondary reinforcing processing: pushing the engaging rod (6) inward to make the engaging rod (6) drive the engaging block (602) to engage with the engaging tooth A (302), and the end of the handle (603) to adhere to the auxiliary base (1), and cooperating with the inclined nail auxiliary nail (7) to connect the engaging rod (6), the auxiliary base (1) and the foundation pit again, and at the same time limiting the engaging rod (6).

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