CN207633795U - A kind of foundation pit suspension lane device - Google Patents

Abstract

The utility model discloses a suspension channel device for a foundation pit. The channel device comprises a concrete foundation platform arranged on the top of the foundation pit, a support frame fixed with the platform, and a quick-installation type that is fixed with the support frame and penetrates downward into the foundation pit. Suspension ladder cage, quick-installation suspension ladder cage includes ladder cage standard section and Z-shaped stairs spliced downward layer by layer. The ladder cage standard section has at least three ladder cage poles and cross braces fixed with them and enclosing a closed frame. The ladder cage vertical poles of the top ladder cage standard section are fixed with the support frame, while the corresponding ladder cage vertical poles in the other adjacent ladder cage standard sections are connected through connecting pieces, and the Z-shaped stairs include a rest platform corresponding to each ladder cage standard section. As for the ladder fixed to the rest platform adjacent to the upper and lower sides, the rest platform is provided with a card slot which is fixed on the cross brace of the corresponding ladder cage standard section. The device is suitable for the up and down of construction workers when the excavation depth is constantly changing during the excavation of the foundation pit. It has strong site adaptability, convenient and flexible assembly and disassembly, safe and reliable structure, and can be reused.

Description

A foundation pit suspension channel device

technical field

The utility model relates to the fields of bridges and construction engineering, in particular to a suspension channel device for foundation pits and an installation method thereof. Happening.

Background technique

In the construction of deep foundation pit engineering, on-site construction personnel need to enter the foundation pit through the upper and lower passages to carry out construction work. During the construction of conventional deep foundation pits, the upper and lower passages of the foundation pit are mostly welded by steel pipes, section steel and steel plates, and the upper and lower passages of corresponding heights need to be welded according to the depth of the foundation pit. The disassembly and assembly process of such upper and lower passages is cumbersome and time-consuming It is laborious, poor in adaptability, poor in safety and reliability, and materials such as steel pipes are basically disposable, with low reuse rate and serious waste.

In the existing public technology, such as publication number: CN 203755717 U "Deep Foundation Pit Assembled Upper and Lower Passageway" introduces a kind of upper and lower passageways for deep foundation pits. The technical method is: on the concrete foundation at the bottom of the foundation pit Set up metal columns, and gradually install the assembled ladder cage from bottom to top on this basis. However, this technology is only applicable to the situation where the excavation of the foundation pit is completed and the depth of the foundation pit is fixed, and the concrete foundation must be poured at the bottom of the foundation pit. However, it did not give a solution to how to install the upper and lower passages for personnel when the depth of the foundation pit increases with the excavation during the excavation process of the foundation pit. Therefore, this device has certain limitations and is not suitable for personnel during the excavation process of the foundation pit. up and down.

Contents of the invention

The purpose of the utility model is: to provide a foundation pit suspension channel device for deep foundation pit construction personnel, which can adapt to different excavation depths of foundation pits at any time, which is convenient for construction personnel to go up and down, has strong site applicability, is simple, convenient and flexible to install and disassemble, and has a flexible structure. Safe and reliable, and can be reused.

The technical scheme of the utility model is: a foundation pit suspension channel device, which is suitable for the situation that the excavation depth is constantly changing during the excavation process of the foundation pit, and is characterized in that the channel device includes a concrete foundation platform arranged on the top of the foundation pit, The support frame fixed with the concrete foundation platform and the quick-installed suspension ladder cage fixed with the support frame and deep into the foundation pit downwards, the quick-installation suspension ladder cage includes ladder cage standard sections spliced downward layer by layer and arranged on The Z-shaped staircase in the ladder cage standard section, the ladder cage standard section has at least three ladder cage uprights and cross braces fixed with the ladder cage uprights and forming a closed frame, the ladder cage of the uppermost ladder cage standard section is vertical The rods are fixed to the support frame, and the corresponding ladder cage vertical rods in the other upper and lower adjacent ladder cage standard sections are connected through connecting pieces. The zigzag staircase includes a rest platform corresponding to each ladder cage standard section and an The adjacent rest platform is fixed to the ladder, and the rest platform is provided with a card slot, and is fixed on the cross brace of the corresponding ladder cage standard section by the card slot.

Further, the support frame in the utility model includes more than two cantilever beams fixed by embedded parts provided on the concrete foundation platform and at least one distribution beam erected and fixed above these cantilever beams, the cantilever beams The shape of the closed frame surrounded by the distribution beam is consistent with the closed frame formed by the cross braces of the lower ladder cage standard section, and also includes vertical bars and diagonal braces set corresponding to each cantilever beam. Some embedded parts are fixed, and the two ends of the diagonal brace are fixed with the vertical bar and the cantilever beam, and the ladder cage vertical bar is fixed with the distribution beam.

Furthermore, the ladder cage vertical rod in the utility model is made of fine-rolled threaded steel, which passes through the distribution beam and is fixed with nuts, and the connecting piece is a threaded steel sleeve, and the upper and lower adjacent ladders The ladder cage vertical rods corresponding to the cage standard sections are connected and fixed by threaded steel sleeves; the embedded parts on the concrete foundation platform are precision-rolled threaded steels, which pass through the cantilever beam and cooperate with nuts to lock and fix the cantilever beam; The embedded parts on the side wall of the foundation pit are also finished rolled rebars, which pass through the vertical bars and cooperate with nuts to lock and fix the vertical bars. The two ends of the diagonal braces are welded to the corresponding vertical bars and cantilever beams. , while the top of the vertical bar is also welded with the corresponding cantilever beam.

Further preferably, the upright rods of the ladder cage in the present utility model pass through the cantilever beam and the distribution beam in turn and are locked and fixed with nuts.

Specifically, both the cantilever beam and the distribution beam described in the utility model are made of double channel steel, and openings are opened in advance for the upright rod of the ladder cage to pass through, and at the same time, the cantilever beam is also provided with a concrete foundation platform The opening through which the embedded part on the foundation pit passes, and the vertical bar is also a double channel steel, which has an opening for the embedded part on the side wall of the foundation pit to pass through.

Further, in the utility model, on the side wall of the foundation pit described in the utility model, the buttress rods are evenly spaced at a certain distance x along the longitudinal direction to connect with the vertical rods of the ladder cage to increase the stability of the device, and the x is 4-6m.

Furthermore, the buttress rods described in the utility model are threaded steel, one end of which is inserted into the side wall of the foundation pit, and the other end is welded and fixed with the vertical rod of the ladder cage.

Further, the cross brace in the utility model is connected to the vertical rod of the ladder cage through a bowl button fastener.

Furthermore, the ladder cage standard section in the utility model is a rectangular column structure, with four ladder cage uprights distributed in a rectangle and four cross braces fixed with the ladder cage uprights and enclosing a rectangular closed frame.

Further, in the utility model, a steel backing plate is arranged between the nut of the ladder cage vertical rod to lock the distribution beam and the distribution beam; it cooperates with the embedded parts on the concrete foundation platform to lock the cantilever beam. A steel backing plate is also placed between the nut and the cantilever beam; a steel backing plate is also placed between the nut and the vertical bar that cooperate with the embedded parts on the side wall of the foundation pit to lock the vertical bar.

The concrete implementation assembly method of the present utility model is as follows:

1. On the top of the foundation pit, pour a concrete foundation platform along the periphery of the foundation pit, and pre-embed the finished rolled rebar on the top of the concrete foundation platform and the side wall of the foundation pit as embedded parts.

2. After the strength of the concrete foundation platform and the side wall of the foundation pit reaches the design strength, the cantilever beams and vertical bars of the support frame are distributed with the embedded parts on the concrete foundation platform and the side wall of the foundation pit through nuts and steel backing plates. connected.

3. Weld and fix the top of the vertical bar to the cantilever beam. At the same time, the diagonal brace of the support frame is made of a single square steel. Weld the two ends of the diagonal brace to the vertical bar and the cantilever beam. At the same time, the distribution beam is mounted on the cantilever beam and welded.

4. Install the ladder cage pole of the ladder cage standard section. The ladder cage pole is made of fine-rolled rebar. The upper part of the ladder cage pole of the uppermost ladder cage standard section passes through the cantilever beam and the distribution beam in turn, and then passes through the nut and steel The backing plate is locked and fixed, and the lower part is connected to the ladder cage vertical rod of the lower ladder cage standard section through a threaded steel sleeve, and can be extended as needed.

5. Install the cross brace of the standard section of the ladder cage. The cross brace is made of seamless steel pipe, connected to the vertical rod of the ladder cage through a bowl button fastener, and surrounded by a closed frame. Depending on the shape of the cloth, for example, three ladder cage poles are distributed in a triangle, and the closed frame surrounded by the cross braces is a triangle. Usually, we use four ladder cage poles to be distributed in a rectangle, and the corresponding four cross braces form a triangle. The enclosing box of is also a rectangle.

6. Install the Z-shaped stairs. The rest platform and the steps that make up the Z-shaped stairs are all made of steel plates. The rest platform is fixed to the cross brace of the corresponding ladder cage standard section through the card slots on it, and the steps are adjacent to the upper and lower sides. The rest of the platform is welded.

7. On the side wall of the foundation pit, there are vertically evenly spaced 4~6m with buttress rods connected with the vertical rods of the ladder cage. The cage pole is welded and fixed. Used to ensure the stability of the entire device.

8. As the excavation depth of the foundation pit increases, repeat the above steps 4-7 to install the standard section of the ladder cage section by section to meet the needs of the operators.

The utility model has the advantages of:

1. The foundation pit suspension channel device provided by the utility model, compared with the conventional channel device designed and built according to the depth of the excavated foundation pit, the biggest core feature is that it is suitable for the environment where the excavation depth is constantly changing during the excavation process of the foundation pit. Situation (built from top to bottom), that is, it can adapt to different excavation depths of foundation pits at any time, which is convenient for construction personnel to go up and down, has strong site applicability, and is simple, convenient and flexible to install and disassemble, safe and reliable in structure, and can be reused.

2. In the support frame of the present utility model, the fine-rolled threaded steel is set on the concrete foundation platform as an embedded part, and after passing through the cantilever beam, it cooperates with a nut to lock and fix the cantilever beam; and on the side wall of the foundation pit The embedded parts are also precision-rolled rebar, which pass through the vertical bar and cooperate with the nut to lock and fix the vertical bar. These designs not only ensure the stability of the structure, but also greatly facilitate the support frame during the excavation of the foundation pit. Quick set-up, installation and dismantling, while materials can be reused.

3. The vertical rod of the ladder cage in the utility model is made of fine-rolled rebar, and its upper end and the distribution beam are locked and fixed by nuts, while the two rods of the ladder cage are connected by a rebar sleeve, which is extremely convenient for the foundation pit. The ladder cage is extended during the excavation process; the cross brace is connected to the vertical pole of the ladder cage through a bowl button fastener; the ladder and the rest platform are made of steel plates, and the rest platform is fixed on the cross brace through the card slot provided on it. These designs greatly facilitate the construction, installation and disassembly of the fast channel during the excavation of the foundation pit, and the materials can be reused.

4. In a specific embodiment of the utility model, the ladder cage vertical rod passes through the cantilever beam and the distribution beam successively and is locked and fixed with a nut, that is, the cantilever beam and the distribution beam are fixed simultaneously through the ladder cage vertical rod, simplifying The original fixing operation between the cantilever beam and the distribution beam is eliminated, which is conducive to the rapid assembly and disassembly of the channel, saving time and material costs, and the materials can be reused.

5. The cantilever beam of the support frame in this utility model is fixed by the vertical bar and the diagonal brace, and then supports the distribution beam, while the lower ladder cage is fixed by the buttress rods set on the side wall of the foundation pit. These structural designs ensure It ensures the stability of the overall structure of the channel device.

6. The cantilever beam and the distribution beam described in the utility model are all made of double channel steel, on which there are openings for the ladder cage vertical rod to pass through, and at the same time, the cantilever beam is also opened for the concrete foundation platform to pass through. The openings through which the embedded parts pass through, and the vertical bar is also a double channel steel, and there are holes for the embedded parts on the side wall of the foundation pit to pass through. These designs are also very convenient During the excavation of the foundation pit, the construction, installation and disassembly of the fast channel can be carried out, and the materials can be reused at the same time.

7. In the utility model, a steel backing plate is provided between the nut and the distribution beam in cooperation with the vertical rod of the ladder cage to lock the distribution beam; it cooperates with the embedded parts on the concrete foundation platform to lock the nut of the cantilever beam. A steel backing plate is also placed between the cap and the cantilever beam; a steel backing plate is also placed between the nut and the vertical bar that cooperate with the embedded parts on the side wall of the foundation pit to lock the vertical bar. The introduction protects the corresponding distribution beams, cantilever beams and vertical bars, allowing the material to be reused.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is the three-dimensional structure schematic diagram of a kind of specific embodiment of the utility model;

Fig. 2 is the front view of Fig. 1 embodiment;

Fig. 3 is a side view of the embodiment of Fig. 1 .

Among them: 1. Cantilever beam, 2. Vertical bar, 3. Distribution beam, 4. Diagonal brace, 5. Cross brace, 6. Ladder cage pole, 7. Ladder, 8. Rest platform, 9. Nut, 10, Embedded parts, 11, threaded steel sleeve, 12, buttress wall rod; 13, concrete foundation platform; 14, steel backing plate.

Detailed ways

Embodiment: Below in conjunction with Fig. 1～shown in Fig. 3, a kind of specific implementation mode of this foundation pit suspension channel device provided by the utility model is described in detail as follows: this channel device is applicable to the depth of excavation in the foundation pit excavation process Constantly changing situation, it has the concrete foundation platform 13 that is arranged on the top of the foundation pit, the support frame fixed with this concrete foundation platform 13 and the quick-installed suspension ladder cage that is fixed with the support frame and goes deep into the foundation pit downwards. The installed hanging ladder cage includes the standard section of the ladder cage which is spliced downward layer by layer and the Z-shaped stairs arranged in the standard section of the ladder cage. The standard section of the ladder cage in this embodiment is a rectangular frame structure. Root ladder cage upright bar 6 and four cross braces 5 that are fixed with ladder cage upright bar 6 and surround into a rectangular closed frame form together. The ladder cage vertical rod 6 of the uppermost ladder cage standard section is fixed to the support frame, and the corresponding ladder cage vertical rods 6 in the other upper and lower adjacent ladder cage standard sections are connected by connecting pieces, and the zigzag stairs are corresponding The rest platform 8 provided in each ladder cage standard section and the ladder 7 fixed to the rest platform 8 adjacent up and down, the rest platform 8 (both sides) is provided with a card slot, and is set on the corresponding ladder by the card slot. Fix on two horizontal braces 5 on the parallel both sides of cage standard section.

The support frame in this embodiment has two parallel cantilever beams 1 fixed by the embedded parts 10 provided on the concrete foundation platform 13 and two parallel distribution beams erected and fixed above the two cantilever beams 1 3. The shape of the closed frame enclosed by the cantilever beam 1 and the distribution beam 3 is consistent with the closed frame enclosed by the cross braces 5 of the lower ladder cage standard section, and is also rectangular. The structure of the supporting frame also has vertical bars 2 and diagonal braces 4 corresponding to each cantilever beam 1. The vertical bars 2 are fixed by the embedded parts 10 provided on the side walls of the foundation pit, and the two ends of the diagonal braces 4 Fixed with vertical bar 2 and cantilever beam 1.

As shown in Figures 1 to 3 in detail, the ladder cage vertical rod 6 in this embodiment is made of precision-rolled rebar, which passes through the cantilever beam 1 and distribution beam 3 in turn and is locked and fixed with nuts 9 . And described connector is threaded steel sleeve 11, and the ladder cage upright bar 6 corresponding of the ladder cage standard section adjacent up and down described is connected and fixed by threaded steel sleeve 11; 10 is a finish-rolled rebar, which is matched with a nut 9 to lock and fix the cantilever 1 after passing through the cantilever beam 1; and the embedded part 10 on the side wall of the foundation pit is also a finish-rolled rebar, which passes through the vertical After the rod 2 is fitted with a nut 9 to lock and fix the vertical rod 2, the two ends of the brace 4 are welded with the corresponding vertical rod 2 and the cantilever beam 1, and the top of the vertical rod 2 is also welded with the corresponding cantilever beam 1.

In this embodiment, the cantilever beam 1 and the distribution beam 3 are all made of double channel steel, and there are holes for the ladder cage vertical rod 6 to pass through in advance, and the cantilever beam 1 is also opened for the concrete foundation. The opening through which the embedded part 10 on the platform 13 passes, and the vertical bar 2 is also a double channel steel, which has an opening for the embedded part 10 on the side wall of the foundation pit to pass through.

In this embodiment, the side walls of the foundation pit are provided with buttress rods 12 connected to the vertical rods 6 of the ladder cage at an even distance of 5 m along the longitudinal direction, so as to increase the stability of the device. The buttress rod 12 is threaded steel, one end of which is inserted into the side wall of the foundation pit, and the other end is welded and fixed with the vertical rod 6 of the ladder cage.

In this embodiment, the cross brace 5 is connected to the vertical rod 6 of the ladder cage through a bowl button fastener.

In this embodiment, a steel backing plate 14 is also provided between the nut 9 and the distribution beam 3 in cooperation with the ladder cage vertical rod 6 to lock the distribution beam 3; it cooperates with the embedded part 10 on the concrete foundation platform 13 to lock A steel backing plate 14 is also placed between the nut 9 of the cantilever beam 1 and the cantilever beam 1; cooperate with the embedded part 10 on the side wall of the foundation pit to lock the nut 9 of the vertical bar 2 and the vertical bar 2 Also be provided with steel backing plate 14 between pad.

Shown in conjunction with Fig. 1 ~ Fig. 3, the specific implementation assembly method of this embodiment is as follows:

1. Concrete foundation platform 13 is poured along the periphery of the foundation pit on the top of the foundation pit, and pre-embedded finished rolled rebar is used as embedded part 10 on the top of concrete foundation platform 13 and the side wall of foundation pit.

2. After the strength of the concrete foundation platform 13 and the concrete on the side wall of the foundation pit reaches the design strength, the cantilever beam 1 and the vertical bar 2 of the support frame are distributed on the side of the concrete foundation platform 13 and the foundation pit through the nut 9 and the steel backing plate 14. The embedded parts 10 on the wall are connected.

3. Weld and fix the top of the vertical bar 2 with the cantilever beam 1. At the same time, the diagonal brace 4 of the support frame adopts a single square steel. Weld the two ends of the diagonal brace 4 with the vertical bar 2 and the cantilever beam 1. to the cantilever beam 1 and welded.

4. Install the ladder cage pole 6 of the ladder cage standard section. The ladder cage pole 6 is made of fine-rolled rebar. The upper part of the ladder cage pole 6 of the ladder cage standard section passes through the cantilever beam 1 and the distribution beam 3 in turn. The nut 9 and the steel backing plate 14 are locked and fixed, and the lower part is connected to the ladder cage vertical rod 6 of the lower ladder cage standard section through the threaded steel sleeve 11, and can be extended as required.

5. Install the cross brace 5 of the standard section of the ladder cage. The cross brace 5 is made of seamless steel pipe, connected to the vertical rod 6 of the ladder cage through a bowl button fastener, and surrounded by a rectangular closed frame.

6. Install the Z-shaped stairs, the rest platform 8 and the ladder 7 that constitute the Z-shaped stairs are all steel plates, the rest platform 8 is fixed on the cross brace 5 of the corresponding ladder cage standard section by the card slot on it, and the ladder 7 Then weld with the rest platform 8 adjacent up and down.

7. On the side wall of the foundation pit, there are vertically evenly spaced 5m apart buttress wall rods 12 connected to the vertical rods 6 of the ladder cage. Ladder cage vertical bar 6 is welded and fixed. Used to ensure the stability of the entire device.

8. As the excavation depth of the foundation pit increases, repeat the above steps 4-7 to install the standard section of the ladder cage section by section to meet the needs of the operators.

Of course, the above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present utility model, and its purpose is to allow people familiar with this technology to understand the content of the present utility model and implement it accordingly, and cannot limit the protection scope of the present utility model with this. All modifications made according to the spirit of the main technical solutions of the utility model shall fall within the protection scope of the utility model.

Claims (10)

1. A suspension channel device for a foundation pit, which is suitable for the situation that the excavation depth is constantly changing during the excavation of the foundation pit, and is characterized in that the channel device includes a concrete foundation platform (13) arranged on the top of the foundation pit, and the concrete foundation platform (13). The support frame fixed on the foundation platform (13) and the quick-installation suspension ladder cage fixed with the support frame and deep into the foundation pit downwards, the quick-installation suspension ladder cage includes ladder cage standard sections spliced downward layer by layer and arranged on Z-shaped stairs in the standard section of the ladder cage, the standard section of the ladder cage has at least three ladder cage uprights (6) and cross braces (5) fixed with the ladder cage uprights (6) and forming a closed frame, the topmost The ladder cage vertical rods (6) of the ladder cage standard section are fixed to the support frame, and the corresponding ladder cage vertical rods (6) in the other upper and lower adjacent ladder cage standard sections are connected by connecting pieces, and the zigzag staircase It includes a rest platform (8) corresponding to each ladder cage standard section and a ladder (7) fixed to the rest platform (8) adjacent to the upper and lower sides. The rest platform (8) is provided with a card slot, and is The slot card is fixed on the cross brace (5) of the corresponding ladder cage standard section. 2. A foundation pit suspension channel device according to claim 1, characterized in that the support frame includes more than two cantilever beams ( 1) and at least one distribution beam (3) erected and fixed above these cantilever beams (1), the shape of the closed frame enclosed by the cantilever beam (1) and the distribution beam (3) is the same as that of the standard section of the ladder cage below The closed frame surrounded by the cross braces (5) is consistent, and also includes vertical bars (2) and diagonal braces (4) corresponding to each cantilever beam (1). The embedded part (10) is fixed, and the two ends of the diagonal brace (4) are fixed with the vertical bar (2) and the cantilever beam (1), and the ladder cage vertical bar (6) is fixed with the distribution beam (3). 3. A foundation pit suspension channel device according to claim 2, characterized in that the ladder cage vertical rod (6) is made of precision-rolled rebar, which passes through the distribution beam (3) and is locked with a nut (9) and the connecting piece is a threaded steel sleeve (11), and the ladder cage vertical rods (6) corresponding to the upper and lower adjacent ladder cage standard sections are connected and fixed through the threaded steel sleeve (11); The embedded parts (10) on the concrete foundation platform (13) are precision-rolled rebars, which pass through the cantilever beam (1) and cooperate with nuts (9) to lock and fix the cantilever beam (1); and the foundation pit The embedded parts (10) on the side wall are also precision-rolled rebars, which pass through the vertical bar (2) and cooperate with nuts (9) to lock and fix the vertical bar (2). The end is welded with the corresponding vertical bar (2) and the cantilever beam (1), and the top of the vertical bar (2) is also welded with the corresponding cantilever beam (1). 4. A foundation pit suspension channel device according to claim 3, characterized in that the ladder cage vertical rod (6) passes through the cantilever beam (1) and the distribution beam (3) in sequence and then uses the nut (9) Lock securely. 5. A foundation pit suspension channel device according to claim 4, characterized in that the cantilever beam (1) and the distribution beam (3) are both made of double channel steel, on which there are pre-opened vertical rods for the ladder cage (6) Openings through which the cantilever beam (1) is also provided with openings for the embedded parts (10) on the concrete foundation platform (13) to pass through, and the vertical bar (2) It is also a double channel steel, which is provided with an opening for the embedded part (10) on the side wall of the foundation pit to pass through. 6. A foundation pit suspension channel device according to claim 1, characterized in that the side wall of the foundation pit is evenly spaced at a certain distance x in the longitudinal direction, and there are buttress rods (12) connected with the vertical rods (6) of the ladder cage , used to increase the stability of the device, the x is 4~6m. 7. A foundation pit suspension channel device according to claim 6, characterized in that the buttress wall rod (12) is threaded steel, one end of which is inserted into the side wall of the foundation pit, and the other end is connected to the vertical rod of the ladder cage (6) Soldering and fixing. 8. The foundation pit suspension channel device according to claim 1, characterized in that the cross brace (5) is connected to the ladder cage vertical rod (6) through a bowl button fastener. 9. A foundation pit suspension channel device according to claim 1, 2 or 8, characterized in that the ladder cage standard section is a rectangular column structure, with four ladder cage vertical rods (6) distributed in a rectangle and connected with The ladder cage vertical bar (6) is fixed and surrounds four cross braces (5) of a rectangular closed frame. 10. A foundation pit suspension channel device according to claim 3, characterized in that it cooperates with the ladder cage vertical rod (6) to lock the nut (9) of the distribution beam (3) and the distribution beam (3). There is also a steel backing plate (14) between them; cooperate with the embedded part (10) on the concrete foundation platform (13) to lock the nut (9) of the cantilever beam (1) and the cantilever beam (1) A steel backing plate (14) is also padded; a pad is also padded between the nut (9) of the locking vertical rod (2) and the vertical rod (2) to cooperate with the embedded part (10) on the side wall of the foundation pit. There is a steel backing plate (14).