Foundation pit excavation support structure and construction method

Abstract

The present invention provides a foundation pit excavation support structure and construction method, belonging to the technical field of foundation pit support, comprising a support plate, an anchor rod and a fixing rod, wherein the support plate is attached to the side wall of the foundation pit, the top end of the support plate is provided with an oblique through-hole extending toward the side wall of the foundation pit, the bottom end of the support plate is provided with a fixing hole, the oblique through-hole being located directly above the fixing hole, a rod body is provided through the oblique through-hole and obliquely inserted into the side wall of the foundation pit, the height of the second end of the rod body is lower than the height of the first end of the rod body, a connecting hook is provided on the rod body, the fixing rod is provided through the fixing hole, the fixing rod is inserted into the side wall of the foundation pit, a plurality of connecting holes are provided on the upper surface of the fixing rod, the second end of the rod body is provided through one of the connecting holes, and the connecting hook is hooked into the connecting hole. The present invention utilizes the gravity of the soil on the side wall of the foundation pit to press on the fixing rod, and the fixing rod provides a stable pulling force for the anchor rod, thereby increasing the anchoring force of the anchor rod in the soil layer and improving the stability of the support plate structure.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support, and in particular to a foundation pit excavation support structure and a construction method. Background Art

[0002] Foundation pit support is a measure to support, reinforce and protect the side walls of the foundation pit and the surrounding environment to ensure the safety of underground structure construction and the environment around the foundation pit. When excavating in the city, there are usually various structures such as traffic arteries, existing buildings or pipelines around the foundation pit. In order to protect the safe use of the surrounding structures and avoid foundation pit collapse at the same time, it is necessary to set up a support structure in the foundation pit.

[0003] The traditional anchor support structure is to insert several anchor rods into the foundation pit to form an anchoring effect. Specifically, one end of the anchor rod body is inserted into the rock layer inside the foundation pit, and then connected to the other end of the rod body through the anchor seat so that the anchor seat contacts the side wall of the foundation pit, thereby fixing the rod body in the rock layer inside the foundation pit.

[0004] Although anchor support works by inserting an anchor rod into the rock formation inside the foundation pit and connecting the other end of the rod through an anchor seat so that the anchor seat contacts the side wall of the foundation pit, thereby fixing the rod body in the rock formation inside the foundation pit, it can be difficult for the anchor rod to obtain sufficient anchoring force in geological conditions prone to collapse, such as soft soil foundations and sandy soil layers, due to the relatively low bearing capacity of the soil, resulting in insufficient stability of the support structure. In addition, groundwater flow in the sandy soil layer may further weaken the stability of the soil, increasing the risk of failure of the support structure. Summary of the Invention

[0005] The purpose of the present invention is to provide a foundation pit excavation support structure, which can increase the anchoring force of anchor rods in the soil layer and improve the stability of the support structure under easily collapsing geological conditions such as soft soil foundation and sandy soil layer.

[0006] In a first aspect, an embodiment of the present invention is achieved through the following technical solutions: a foundation pit excavation support structure, comprising a support plate, an anchor rod and a fixing rod, the support plate being attached to the side wall of the foundation pit, the top of the support plate being penetrated with an oblique through-hole toward the side wall of the foundation pit, the bottom end of the support plate being penetrated horizontally with a fixing hole, the oblique through-hole being located directly above the fixing hole, the anchor rod comprising a baffle and a rod body, the baffle being fixedly connected to the first end of the rod body, the baffle abutting the support plate and being connected by bolts, the rod body being penetrated by the oblique through-hole and obliquely inserted into the side wall of the foundation pit, the height of the second end of the rod body being lower than the height of the first end of the rod body, a connecting hook being provided on the rod body, the fixing rod being penetrated by the fixing hole, the fixing rod being inserted into the side wall of the foundation pit, a plurality of connecting holes being provided on the upper surface of the fixing rod, the second end of the rod body being penetrated by one of the connecting holes, and the connecting hook being hooked in the connecting hole.

[0007] Furthermore, a receiving hole is provided on the fixed rod, a vertical rotating shaft is vertically arranged in the receiving hole, a horizontal expansion plate is horizontally rotated on the vertical rotating shaft, a pushing rod is slidingly arranged inside the fixed rod, the abutting end of the pushing rod abuts the free end of the horizontal expansion plate, and rotates around the vertical rotating shaft until the free end of the horizontal expansion plate protrudes horizontally from the surface of the fixed rod.

[0008] Furthermore, the horizontal cross-section of the abutting end of the push rod is conical, the small head end of the abutting end of the push rod is arranged on the side of the horizontal expansion plate close to the center of the fixed rod, and the width of the large head end of the abutting end of the push rod is greater than half the width of the fixed rod and less than the width of the fixed rod.

[0009] Furthermore, a horizontal rotating shaft is provided at the bottom of the accommodating hole, a vertical expansion plate is rotatably provided on the horizontal rotating shaft, and the abutting end of the push rod abuts against the free end of the vertical expansion plate and rotates around the horizontal rotating shaft until the free end of the vertical expansion plate is vertically inserted into the soil.

[0010] Furthermore, an auxiliary slot hole is opened on the support plate toward the side wall of the foundation pit, a matching slot hole is opened at the end of the fixing rod, the matching slot hole and the auxiliary slot hole are located on the same straight line, and an auxiliary plate is inserted into the auxiliary slot hole and the matching slot hole.

[0011] Furthermore, the support plate is provided with two auxiliary slots, and the two auxiliary slots are cross-intersected in the middle of the end surface of the fixing rod.

[0012] Furthermore, a plurality of limit rods are slidably provided in the hole wall of the connecting hole along the length of the fixing rod, and the plurality of limit rods close the connecting hole. The second end of the rod body passes through and squeezes the limit rod to separate, and the limit rod is hooked with the connecting hook. A tightening spring is provided on the hole wall of the connecting hole for pushing the limit rod to tighten.

[0013] Furthermore, an inclined sleeve is provided on the side of the support plate facing away from the side wall of the foundation pit, the inclined sleeve is provided at the opening of the inclined through hole, and the inclination angle of the inclined sleeve is the same as the inclination angle of the inclined through hole, and the anchor rod is passed through the inclined sleeve.

[0014] Furthermore, the horizontal width of the fixing rod is greater than the vertical thickness of the fixing rod.

[0015] In a second aspect, the present invention discloses a construction method of a foundation pit excavation support structure, comprising:

[0016] S1. Install the support plate on the side wall of the foundation pit so that the oblique through-holes in the support plate are located above the fixing holes;

[0017] S2. Insert the fixing rod into the side wall of the foundation pit along the fixing hole, and fix the end of the fixing rod to the supporting plate;

[0018] S3, inserting the anchor rod into the side wall of the foundation pit along the oblique through-hole at an inclined angle until the rod body passes through the connecting hole, the connecting hook is hooked with the connecting hole, and the first end of the rod body is fixedly connected to the supporting plate;

[0019] S4, driving the push rod to slide, so that the abutting end of the push rod protrudes the horizontal expansion plate and the vertical expansion plate from the surface of the fixed rod;

[0020] S5. Insert the auxiliary plate into the auxiliary slot and the matching slot.

[0021] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0022] 1. The present invention penetrates a fixing rod at the bottom of the support plate toward the side wall of the foundation pit, and fixes the inclined anchor rod to the fixing rod. The gravity of the soil on the side wall of the foundation pit is used to press the fixing rod. When the soil on the side wall exerts pressure toward the support plate and collapses, the gravity of the soil on the side wall acts on the fixing rod to provide a stable pulling force for the anchor rod, thereby increasing the anchoring force of the anchor rod in the soil layer and improving the stability of the support plate structure.

[0023] 2. The present invention rotates and sets a horizontal expansion plate on the fixing rod. The horizontal expansion plate is used to increase the force-bearing area of ​​the fixing rod and the soil in the horizontal direction, thereby improving the stability of the fixing rod in soft soil such as soft soil foundation and sandy soil layer, thereby enabling the fixing rod to provide sufficient holding force for the anchor rod;

[0024] 3. The present invention rotates and sets a vertical expansion plate on the fixed rod. The vertical expansion plate increases the force-bearing area of ​​the fixed rod in the vertical direction, helps to disperse and absorb soil pressure, reduces the lateral pressure of the soil on the support structure, and thus reduces the risk of failure of the support structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 Schematic diagram of the structure of the support plate in the present invention;

[0028] Figure 3 Schematic diagram of the structure of the anchor rod in the present invention;

[0029] Figure 4 This is a schematic diagram for illustrating the structure of the fixing rod in the present invention;

[0030] Figure 5 Schematic diagram of the internal structure of the fixing rod in the present invention;

[0031] Figure 6 for Figure 5 An enlarged schematic diagram of part B;

[0032] Figure 7 This is a schematic diagram of the structure in which the conical abutment seat drives the vertical expansion plate and the horizontal expansion plate to rotate in the present invention;

[0033] Figure 8 Schematic diagram of the structure of the auxiliary plate in the present invention;

[0034] Figure 9 for Figure 4 A magnified schematic diagram of part A;

[0035] Figure 10 It is a schematic diagram of a construction method of a foundation pit excavation support structure in the present invention.

[0036] Icons: 10. Support plate; 11. Oblique sleeve; 12. Oblique through hole; 13. Fixing hole; 14. Auxiliary slot hole; 15. Auxiliary plate; 16. Reserved hole; 17. End plate; 20. Anchor rod; 21. Baffle; 22. Rod body; 23. Connecting groove; 24. Connecting hook; 30. Fixing rod; 31. Connecting hole; 32. Limiting rod; 33. Clamping spring; 34. Accommodating hole; 35. Vertical rotation axis; 36. Horizontal expansion plate; 37. Horizontal rotation axis; 38. Vertical expansion plate; 39. Push rod; 301. Conical abutment seat; 302. Matching slot hole. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0039] The following is further explained with reference to specific embodiments.

[0040] Example 1, refer to Figure 1 and Figure 2 As shown, the present invention is a foundation pit excavation support structure, referring to Figure 1 , including a support plate 10, which is vertically attached to the side wall of the foundation pit, and an inclined sleeve 11 is fixedly installed on the top of the support plate 10, and the inclined sleeve 11 is inclined vertically downward from the end away from the support plate 10 to the end close to the support plate 10. The top of the support plate 10 is inclined toward the side wall of the foundation pit and is provided with an inclined through-hole 12. The inclined sleeve 11 is installed at the opening of the inclined through-hole 12, and the inclination angle of the inclined sleeve 11 is the same as the inclination angle of the inclined through-hole 12. An anchor rod 20 is passed through the inclined through-hole 12.

[0041] Reference Figure 2 and Figure 3As shown, specifically, the anchor rod 20 includes a baffle 21 and a rod body 22. The first end of the rod body 22 is fixedly connected to the center of the baffle 21, and the rod body 22 passes through the inclined sleeve 11 and the inclined through-hole 12, and is inserted into the soil of the side wall of the foundation pit. The baffle 21 abuts against the end of the inclined sleeve 11 and is fixedly connected by bolts. The second end of the rod body 22 is a pointed end, so that it can be inserted into the soil more smoothly. A connecting groove 23 is provided in a recessed manner on the surface of the rod body 22 near the second end of the rod body 22, and a connecting hook 24 is provided on the side of the connecting groove 23 near the tip of the rod body 22, and the connecting hook 24 is bent toward the inner direction of the connecting groove 23.

[0042] Reference Figure 2 As shown, the bottom of the support plate 10 is provided with a fixing hole 13 extending horizontally through it, facing the sidewall of the foundation pit. The longitudinal cross-section of the fixing hole 13 is rectangular, and the length of the fixing hole 13 along the horizontal edge is greater than the length along the vertical edge. The support plate 10 also has two auxiliary slots 14 extending through it around the fixing hole 13. The two auxiliary slots 14 are located at the center of two adjacent sides of the longitudinal cross-section of the fixing hole 13, and the two auxiliary slots intersect within the fixing hole 13. The length of the horizontal slot is less than the vertical slot.

[0043] Reference Figure 1-Figure 5 and Figure 9 As shown, a fixing rod 30 is passed through the fixing hole 13, and the first end of the fixing rod 30 is inserted into the soil of the side wall of the foundation pit perpendicular to the surface of the support plate 10, and the first end of the fixing rod 30 is a pointed end. The longitudinal cross-sectional shape of the fixing rod 30 is the same as the longitudinal cross-sectional shape of the fixing hole 13, and the size is adapted. A plurality of connecting holes 31 are provided on the upper surface of the fixing rod 30 along the vertical direction, and the plurality of connecting holes 31 are equidistantly distributed along the length direction of the fixing rod 30. The cross-sectional shape of the connecting hole 31 is a waist-shaped hole, and the length of the waist-shaped hole extends along the length direction of the fixing rod 30. A plurality of limiting rods 32 are slidably installed in the connecting hole 31, and the plurality of limiting rods 32 are distributed side by side along the width direction of the waist-shaped hole. The limiting rod 32 is cylindrical. A retaining spring 33 is installed within the connection hole 31, extending along the length of the connection hole 31. When the retaining spring 33 is compressed, the elastic force of the retaining spring 33 pushes the multiple limiting rods 32 against each other, closing the opening of the connection hole 31. When the anchor rod 20 passes through the connection hole 31, the tip of the rod body 22 passes through the gaps between the limiting rods 32, further compressing the retaining spring 33 and causing the limiting rods 32 to press against the surface of the rod body 22. When the anchor rod 20 continues to penetrate until the limiting rods 32 are located within the connection groove 23, the connecting hook 24 engages the limiting rod 32, preventing the rod body 22 from being withdrawn from the connection hole 31 in the opposite direction.

[0044] Reference Figure 4-Figure 6As shown, the fixing rod 30 further has receiving holes 34 formed on both horizontal side surfaces, extending along the length of the fixing rod 30. A vertical rotation axis 35 is vertically mounted at the first end of the receiving hole 34, adjacent to the first end of the fixing rod 30. A horizontal expansion plate 36 is rotatably mounted on the vertical rotation axis 35, with one end of the horizontal expansion plate 36 rotatably connected to the vertical rotation axis 35. The horizontal expansion plate 36 is flat. When received within the receiving hole 34, the horizontal expansion plate 36 forms a portion of the surface of the fixing rod 30, thereby reducing resistance to insertion of the fixing rod 30 into the soil. The fixing rod 30 also has a receiving hole 34 formed on its bottom surface. A horizontal rotation axis 37 is mounted at the first end of the receiving hole 34, with a vertical expansion plate 38 rotatably mounted on the horizontal rotation axis 37. The vertical expansion plate 38 has the same structure as the horizontal expansion plate 36, differing only in the mounting position, which will not be further described here.

[0045] Reference Figure 5 and Figure 7 As shown, the interior of the fixed rod 30 is hollow, and a push rod 39 is slidably mounted therein, sliding along the length of the fixed rod 30. A conical abutment seat 301 is fixedly mounted on the push rod 39, serving as the abutment end for the push rod 39 to control the rotation of the horizontal expansion plate 36 and the vertical expansion plate 38. The conical abutment seat 301 is composed of three abutment plates, each of which is triangular in shape. Two of the abutment plates are horizontally connected along their longer right-angled sides, while the longer right-angled side of the other abutment plate is perpendicular to the connection between the two abutment plates. This gives the conical abutment seat 301 a conical cross-sectional and longitudinal cross-sectional shape. The small end of the conical abutment seat 301 is located near the first end of the fixed rod 30 and is positioned between the free ends of the vertical expansion plate 38 and the horizontal expansion plate 36. The width of the larger end of the conical abutment seat 301 is greater than half the width of the fixed rod 30 and less than the width of the fixed rod 30. When the push rod 39 is controlled to slide toward the first end of the fixed rod 30, the free ends of the vertical expansion plate 38 and the horizontal expansion plate 36 slide along the hypotenuse of the abutment plate of the conical abutment seat 301, respectively driving the vertical expansion plate 38 and the horizontal expansion plate 36 to rotate about the horizontal rotation axis 37 and the vertical rotation axis 35 until they respectively protrude from the surface of the fixed rod 30. The end of the push rod 39 away from the fixed rod 30 extends through the end surface of the second end of the fixed rod 30, so that the push rod 39 can be driven to slide within the fixed rod 30 by a power device.

[0046] Reference Figure 4 and Figure 8As shown, a cross-shaped mating slot 302 is provided on the end surface of the second end of the fixing rod 30. The mating slot 302 is opposite the auxiliary slot 14 and extends from the end surface of the second end of the fixing rod 30 toward the center of the fixing rod 30. An auxiliary plate 15 is inserted into the mating slot 302. There are two auxiliary plates 15, which are perpendicular to each other. One of the auxiliary plates 15 has a reserved hole 16 for the propulsion rod 39 to pass through. The two auxiliary plates 15 are respectively inserted into the mating slot 302 and the auxiliary slot 14 in a relative state until the auxiliary plates 15 are inserted into the soil of the foundation pit side wall. An end plate 17 is also fixedly mounted on the end surface of the auxiliary plate 15. The end plate 17 is perpendicular to the auxiliary plate 15 and is used to abut the side of the support plate 10 facing away from the foundation pit side wall. Bolt holes are provided in the end plate 17 for fixing the auxiliary plate 15 to the support plate 10. The auxiliary plate 15 is used to connect the fixing rod 30 and the bottom of the supporting plate 10 to increase the stability of the bottom of the supporting plate 10.

[0047] Example 2, refer to Figure 10 As shown, the present invention discloses a construction method of a foundation pit excavation support structure, comprising:

[0048] S1. Install the support plate 10 on the side wall of the foundation pit so that the oblique through-holes 12 in the support plate 10 are located above the fixing holes 13;

[0049] The support plate 10 is closely attached to the side wall of the foundation pit, and the gap between the support plate 10 and the side wall of the foundation pit is filled with soil. The oblique through-holes 12 in the support plate 10 are located above the fixing holes 13.

[0050] S2. Insert the fixing rod 30 into the side wall of the foundation pit along the fixing hole 13, and fix the end of the fixing rod 30 to the supporting plate 10;

[0051] The fixing rod 30 is inserted into the pit sidewall through the fixing hole 13. The end of the fixing rod 30 is fixedly connected to the support plate 10. The connection hole 31 in the fixing rod 30 faces upward. During the process of inserting the fixing rod 30 into the soil of the pit sidewall, the horizontal expansion plate 36 and the vertical expansion plate 38 are both received in the receiving hole 34.

[0052] S3. Insert the anchor rod 20 into the side wall of the foundation pit along the oblique through-hole 12 at an inclined angle until the rod body 22 passes through the connecting hole 31. The connecting hook 24 is hooked with the connecting hole 31 to securely connect the first end of the rod body 22 to the supporting plate 10.

[0053] Insert the anchor rod 20 into the soil of the foundation pit sidewall along the oblique through-hole 12, align the tip of the anchor rod 20 with any connection hole 31 in the fixing rod 30, and push the anchor rod 20 toward the connection hole 31 until the tip of the rod body 22 passes through the gap between the plurality of limiting rods 32 and the limiting rod 32 is located in the connection groove 23. Then, fix the rod body 22 of the anchor rod 20 to the support plate 10 with bolts.

[0054] S4, driving the push rod 39 to slide, and the abutting end of the push rod 39 makes the horizontal expansion plate 36 and the vertical expansion plate 38 protrude from the surface of the fixed rod 30;

[0055] When the anchor rod 20 is connected to the fixed rod 30, the driving rod 39 is moved toward the first end of the fixed rod 30. The driving rod 39 squeezes the free ends of the horizontal expansion plate 36 and the vertical expansion plate 38 through the conical abutment seat 301, thereby causing the free ends of the horizontal expansion plate 36 and the vertical expansion plate 38 to rotate around the vertical rotation axis 35 and the horizontal rotation axis 37 respectively until the horizontal expansion plate 36 and the vertical expansion plate 38 both protrude from the surface of the fixed rod 30.

[0056] S5 , inserting the auxiliary plate 15 into the auxiliary slot 14 and the matching slot 302 .

[0057] Align the auxiliary plate 15 with the auxiliary slot 14 and the matching slot 302, and use the auxiliary plate 15 to increase the connection strength between the fixing rod 30 and the bottom of the supporting plate 10, so as to improve the protection effect of the bottom of the supporting plate 10 on the soil.

[0058] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A foundation pit excavation support structure, characterized in that: The invention comprises a supporting plate (10), an anchor rod (20) and a fixing rod (30), wherein the supporting plate (10) is attached to the side wall of the foundation pit, the top end of the supporting plate (10) is penetrated with an oblique through hole (12) toward the side wall of the foundation pit, the bottom end of the supporting plate (10) is penetrated with a fixing hole (13) horizontally, and the oblique through hole (12) is located directly above the fixing hole (13), and the anchor rod (20) comprises a baffle (21) and a rod body (22), the baffle (21) is fixedly connected to the first end of the rod body (22), the baffle (21) is in contact with the supporting plate (10) and is connected by bolts. The rod body (22) is passed through the oblique through hole (12) and obliquely inserted into the side wall of the foundation pit. The height of the second end of the rod body (22) is lower than the height of the first end of the rod body (22). A connecting hook (24) is provided on the rod body (22). The fixing rod (30) is passed through the fixing hole (13). The fixing rod (30) is inserted into the side wall of the foundation pit. A plurality of connecting holes (31) are provided on the upper surface of the fixing rod (30). The second end of the rod body (22) is passed through one of the connecting holes (31), and the connecting hook (24) is hooked in the connecting hole (31). The fixing rod (30) is provided with a receiving hole (34), a vertical rotating shaft (35) is vertically provided in the receiving hole (34), a horizontal expansion plate (36) is horizontally rotated provided on the vertical rotating shaft (35), a pushing rod (39) is slidably provided inside the fixing rod (30), the abutting end of the pushing rod (39) abuts against the free end of the horizontal expansion plate (36), and rotates around the vertical rotating shaft (35) until the free end of the horizontal expansion plate (36) protrudes horizontally from the surface of the fixing rod (30); The horizontal cross-section of the abutting end of the propulsion rod (39) is conical, the small end of the abutting end of the propulsion rod (39) is arranged on one side of the horizontal expansion plate (36) close to the center of the fixing rod (30), and the width of the large end of the abutting end of the propulsion rod (39) is greater than half the width of the fixing rod (30) and less than the width of the fixing rod (30); A horizontal rotation shaft (37) is provided at the bottom of the accommodating hole (34), a vertical expansion plate (38) is rotatably provided on the horizontal rotation shaft (37), and the abutting end of the propulsion rod (39) abuts against the free end of the vertical expansion plate (38) and rotates around the horizontal rotation shaft (37) until the free end of the vertical expansion plate (38) is vertically inserted into the soil; A plurality of limiting rods (32) are slidably provided in the hole wall of the connecting hole (31) along the length of the fixing rod (30), and the plurality of limiting rods (32) close the connecting hole (31). The second end of the rod body (22) passes through and squeezes the limiting rod (32) to separate, and the limiting rod (32) is hooked with the connecting hook (24). A tightening spring (33) for pushing the limiting rod (32) to tighten is provided on the hole wall of the connecting hole (31).

2. The foundation pit excavation support structure according to claim 1, characterized in that: An auxiliary slot (14) is provided on the support plate (10) in the direction of the side wall of the foundation pit, a matching slot (302) is provided at the end of the fixing rod (30), the matching slot (302) and the auxiliary slot (14) are located on the same straight line, and an auxiliary plate (15) is inserted into the auxiliary slot (14) and the matching slot (302).

3. The foundation pit excavation support structure according to claim 2, characterized in that: The supporting plate (10) is provided with two auxiliary slots (14), and the two auxiliary slots (14) are cross-intersected at the middle of the end surface of the fixing rod (30).

4. The foundation pit excavation support structure according to claim 3, characterized in that: An inclined sleeve (11) is provided on the side of the support plate (10) facing away from the side wall of the foundation pit. The inclined sleeve (11) is provided at the opening of the inclined through hole (12), and the inclination angle of the inclined sleeve (11) is the same as the inclination angle of the inclined through hole (12). The anchor rod (20) is passed through the inclined sleeve (11).

5. The foundation pit excavation support structure according to claim 4, characterized in that: The horizontal width of the fixing rod (30) is greater than the vertical thickness of the fixing rod (30).

6. A construction method for a foundation pit excavation support structure according to claim 5, characterized in that: S1. Arrange the support plate (10) on the side wall of the foundation pit so that the oblique through-hole (12) in the support plate (10) is located above the fixing hole (13); S2, inserting the fixing rod (30) into the side wall of the foundation pit along the fixing hole (13), and fixing the end of the fixing rod (30) to the supporting plate (10); S3, inserting the anchor rod (20) into the side wall of the foundation pit along the oblique through-hole (12) at an inclined angle until the rod body (22) passes through the connecting hole (31), the connecting hook (24) is hooked with the connecting hole (31), and the first end of the rod body (22) is fixedly connected to the supporting plate (10); S4, driving the push rod (39) to slide, so that the abutting end of the push rod (39) protrudes the horizontal expansion plate (36) and the vertical expansion plate (38) from the surface of the fixed rod (30); S5. Insert the auxiliary plate (15) into the auxiliary slot (14) and the matching slot (302).

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