Cantilever type deep foundation pit auxiliary supporting structure

Abstract

The cantilever type deep foundation pit auxiliary supporting structure comprises an L-shaped supporting frame fixed to the side wall of a concrete pile, and the supporting frame comprises a horizontal plate and a vertical plate integrally formed with the horizontal plate; the vertical end face of the side, close to the concrete pile, of the vertical plate is of an arc structure attached to the vertical side wall of the concrete pile in shape, a plurality of sets of through holes are formed in the vertical plate in a penetrating mode, and expansion bolts fixed to the concrete pile are inserted into all the sets of through holes in a penetrating mode. Reinforcing ribs are installed between the lower end face of the horizontal plate and the end face of the side, away from the concrete, of the vertical plate in an opposite pulling mode. The supporting strength of the L-shaped supporting frame is improved, and the supporting stability of the supporting structure is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of foundation pit auxiliary support structures, and in particular to a cantilever deep foundation pit auxiliary support structure. Background Art

[0002] Foundation pit support is a measure of support, reinforcement and protection taken on the side walls of the foundation pit in order to meet the construction requirements of underground structures and protect the safety of the environment around the foundation pit. The selection of the overall foundation pit support plan is directly related to the safety of the foundation pit and the surrounding environment, construction progress, and project construction costs.

[0003] The deep foundation pit first excavates the first layer of earthwork, then drives several sets of steel plates vertically into the horizontal plane of the first layer of foundation pit, drives concrete piles downward along the four sides of the first layer of foundation pit, and pours the first layer of concrete formwork along the concrete piles. After the pouring is completed and hardened into shape, the next layer of foundation pit is excavated. The common installation structure of the cantilever support structure is to install several sets of L-shaped support frames on the concrete piles on the four side walls, place the steel purlins on the L-shaped support frames along the four side walls, and then connect several sets of steel pipes between the steel purlins and the steel plates to form a stable support structure.

[0004] The inventor believes that the following defects exist: the existing L-shaped support frame is usually composed of a horizontal plate and a vertical plate. The steel purlin placed directly on the support frame lacks stability and is prone to slipping. There is a gap between the vertical plate of the L-shaped support frame and the concrete pile, which is prone to falling off, resulting in insufficient stability of the cantilever support structure. Therefore, there is room for improvement. Utility Model Content

[0005] In order to improve the supporting strength of the L-shaped support frame and ensure the supporting stability of the support structure, the present application provides a cantilever deep foundation pit auxiliary support structure.

[0006] The cantilever deep foundation pit auxiliary support structure provided in this application adopts the following technical solution:

[0007] A cantilever deep foundation pit auxiliary support structure comprises an L-shaped support frame fixed on the side wall of a concrete pile, the support frame comprises a horizontal plate and a vertical plate integrally formed with the horizontal plate, the vertical end face of the vertical plate close to the concrete pile is an arc structure that fits the shape of the vertical side wall of the concrete pile, a plurality of groups of through holes are penetrated through the vertical plate, and expansion bolts fixed to the concrete pile are inserted through each group of through holes; reinforcing ribs are installed between the lower end face of the horizontal plate and the end face of the vertical plate away from the concrete.

[0008] By adopting the above-mentioned technical scheme, the existing common structure for placing steel purlins is an L-shaped support frame structure fixed on concrete piles, and the support frame is composed of a horizontal plate and a vertical plate. There is a risk of slipping when the steel purlin is placed on the horizontal plate, and the vertical end face is not sufficiently fitted with the arc-shaped concrete pile, resulting in insufficient stability of the L-shaped support frame. In view of the problems existing in the prior installation structure, the present application proposes an auxiliary support structure for a cantilever deep foundation pit. By vertically straightening the vertical end face of the vertical plate close to the concrete pile into an arc surface matching the shape of the concrete pile, the contact area between the vertical plate and the concrete is increased, and the support strength of the L-shaped support frame is increased, thereby improving the support stability of the support structure. The setting of the reinforcing ribs improves the deformation resistance of the horizontal plate and improves the load capacity of the horizontal plate.

[0009] Preferably, a vertically arranged fixing plate is integrally formed on a vertical side wall of the horizontal plate away from the vertical plate, and the fixing plate is located at an upper end portion of the horizontal plate.

[0010] By adopting the above technical solution, the setting of the fixed plate prevents the steel purlin from sliding off the horizontal plate after being placed on the upper end surface of the horizontal plate, thereby improving the installation firmness of the steel purlin and further improving the support effect of the support structure.

[0011] Preferably, the reinforcing rib is integrally formed with a horizontally arranged horizontal wing plate at one end close to the horizontal plate, and the reinforcing rib is integrally formed with a vertically arranged vertical wing plate at one end close to the vertical plate. A fastening bolt is threadedly connected between the horizontal wing plate and the horizontal plate, and a fastening bolt is threadedly connected between the vertical wing plate and the vertical plate.

[0012] By adopting the above technical solution, the arrangement of the horizontal wing plate and the vertical wing plate increases the contact area between the reinforcing rib and the L-shaped support frame, and enhances the connection stability between the reinforcing rib and the L-shaped support frame.

[0013] Preferably, each group of reinforcing ribs has a square frame structure.

[0014] By adopting the above technical solution and setting up the reinforced rib frame structure, it is convenient for workers to load and unload the expansion bolts on the vertical plates and concrete piles during installation and subsequent maintenance, thereby improving the efficiency of installation and maintenance.

[0015] Preferably, steel bars are installed between any two groups of reinforcing ribs on the same side.

[0016] By adopting the above technical solution, steel bars are installed between any two groups of reinforcing bars. The arrangement of the steel bars strengthens the stability between the two adjacent groups of reinforcing bars, further improving the stability of the cantilever support structure.

[0017] Preferably, the horizontal upper end of the horizontal plate is covered with a rubber pad.

[0018] By adopting the above technical solution, when the steel purlin is hoisted and placed on the upper end surface of the horizontal plate, there is a certain impact force on the horizontal plate. The setting of the rubber pad avoids direct contact between the steel purlin and the horizontal plate, and plays a role in buffering and shock absorption; at the same time, the setting of the rubber pad increases the friction resistance of the lower end surface of the steel purlin, and improves the stability of the steel purlin on the horizontal plate.

[0019] Preferably, the outer peripheral surface of each group of L-shaped support frames is coated with a uniformly distributed anti-rust paint layer.

[0020] By adopting the above technical solution, the L-shaped support frame is a metal structure, which is prone to rust when in contact with air, water, etc. on the surface, affecting the supporting strength and service life of the L-shaped support frame. The provision of the anti-rust paint layer avoids direct contact between the metal structure of the L-shaped support frame and air, water, etc. on the surface, delays the rust process of the L-shaped support frame, ensures the supporting effect of the L-shaped support frame, and extends the service life of the L-shaped support frame.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] By vertically straightening the vertical end face of the vertical plate close to the concrete pile into a circular arc surface matching the shape of the concrete pile, the contact area between the vertical plate and the concrete is increased, the support strength of the L-shaped support frame is improved, and thus the support stability of the support structure is improved; the setting of the reinforcing ribs improves the deformation resistance of the horizontal plate and the load capacity of the horizontal plate;

[0023] The fixing plate is set to prevent the steel purlin from sliding on the horizontal plate; the rubber pad is set to buffer the impact force of the steel purlin on the horizontal plate when it is hoisted and placed, thus protecting the horizontal plate;

[0024] By setting the horizontal wing plate and the vertical wing plate, the contact area between the reinforcement rib and the L-shaped support frame is increased, and the connection stability between the reinforcement rib and the L-shaped support frame is enhanced; the setting of the reinforcement rib as a square structure facilitates the workers to load and unload the expansion bolts on the vertical plate and the concrete piles during the installation and subsequent maintenance process, thereby improving the efficiency of installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0026] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0027] Explanation of the accompanying reference numerals: 1. Concrete pile; 2. L-shaped support frame; 3. Horizontal plate; 4. Vertical plate; 5. Through hole; 6. Expansion bolt; 7. Reinforcement rib; 8. Fixing plate; 9. Horizontal wing plate; 10. Vertical wing plate; 11. Fastening bolt; 12. Rebar; 13. Rubber pad; 14. Foundation pit. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-2 This application is described in further detail.

[0029] The present application embodiment discloses a cantilever deep foundation pit auxiliary support structure. Figure 1 Before excavating the deep foundation pit 14, a first layer of shallow foundation pit 14 is excavated within a designated range, and concrete piles 1 are poured along the edges of the shallow foundation pit 14, and then the next layer of foundation pit 14 is excavated.

[0030] Reference Figure 1 and Figure 2 After the excavation of the next layer of foundation pit 14 is completed, several groups of L-shaped support frames 2 are installed along the side walls of the concrete piles 1. The L-shaped support includes a horizontal plate 3 and a vertical plate 4 integrally formed with the horizontal plate 3. The vertical end surface of the vertical plate 4 close to the concrete pile 1 is vertically formed into an arc structure that matches the shape of the concrete pile 1. Several groups of through holes 5 are opened horizontally in the vertical direction, and each group of through holes 5 is penetrated and inserted with an expansion bolt 6 fixed to the concrete pile 1; the setting of the arc surface increases the contact area between the vertical plate 4 and the concrete pile 1, and improves the installation structure stability of the L-shaped support frame 2.

[0031] Reference Figure 2 A vertically arranged fixing plate 8 is integrally formed on the vertical side wall of the horizontal plate 3 away from the vertical plate 4, and the fixing plate 8 is located at the upper end of the horizontal plate 3; the setting of the fixing plate 8 prevents the steel purlin from sliding off the horizontal plate 3 after being placed on the upper end surface of the horizontal plate 3, thereby further improving the supporting effect of the supporting structure.

[0032] Reference Figure 2 A reinforcing rib 7 is installed between the lower end surface of the horizontal plate 3 and the end surface of the vertical plate 4 away from the concrete; a horizontal wing plate 9 is integrally formed with the end of the reinforcing rib 7 close to the horizontal plate 3, and a vertical wing plate 10 is integrally formed with the end of the reinforcing rib 7 close to the vertical plate 4; a fastening bolt 11 is threadedly connected between the horizontal wing plate 9 and the horizontal plate 3, and a fastening bolt 11 is threadedly connected between the vertical wing plate 10 and the vertical plate 4; the arrangement of the horizontal wing plate 9 and the vertical wing plate 10 increases the contact area between the reinforcing rib 7 and the L-shaped support frame 2, and enhances the connection stability between the reinforcing rib 7 and the L-shaped support frame 2.

[0033] Reference Figure 2, each group of reinforcing ribs 7 are in a square structure; the setting of the square structure of the reinforcing ribs 7 facilitates the installation and later maintenance of the workers during the installation and maintenance of the vertical plate 4 and the expansion bolts 6 on the concrete pile 1, thereby improving the efficiency of installation and maintenance.

[0034] Reference Figure 1 and Figure 2 , steel bars 12 are installed between any two groups of reinforcing ribs 7 located on the same side; the setting of the steel bars 12 strengthens the stability between the two adjacent groups of reinforcing ribs 7, and further improves the stability of the cantilever support structure; the outer peripheral surface of each group of L-shaped support frames 2 is coated with a uniformly distributed anti-rust paint layer; the setting of the anti-rust paint layer delays the rust process of the L-shaped support frame 2, ensures the supporting effect of the L-shaped support frame 2, and extends the service life of the L-shaped support frame 2.

[0035] Reference Figure 2 The horizontal upper end of the horizontal plate 3 is covered with a rubber pad 13; when the steel purlin is hoisted and placed on the upper end of the horizontal plate 3, there is a certain impact force on the horizontal plate 3. The setting of the rubber pad 13 avoids direct contact between the steel purlin and the horizontal plate 3, and plays a role in buffering and shock absorption.

[0036] The implementation principle of a cantilever deep foundation pit auxiliary support structure in the embodiment of the present application is:

[0037] Before excavating the deep foundation pit 14, the workers first excavate the first layer of shallow foundation pit 14 within the designated range. After the excavation is completed, concrete piles 1 are poured along the inner wall of the shallow foundation pit 14, and several groups of steel plates are vertically driven into the inner bottom surface of the shallow foundation pit 14. After the concrete piles 1 and the steel plates are set, the next layer of foundation pit 14 is excavated. After the excavation of the next layer of foundation pit 14 is completed, the cantilever support structure is constructed.

[0038] First, mark the installation position of the L-shaped support frame 2 on the inner wall of the concrete pile 1, clamp the vertical plate 4 of the L-shaped support frame 2 at the marked position of the concrete pile 1, and fix the vertical plate 4 to the concrete pile 1 by the expansion bolts 6; after the installation of the L-shaped support frame 2 is completed, fix the reinforcing rib 7 to the L-shaped support frame 2, fix the horizontal wing plate 9 to the lower end surface of the horizontal plate 3 by the fastening bolts 11, and fix the vertical wing plate 10 to the vertical side wall of the vertical plate 4 by the fastening bolts 11.

[0039] After the reinforcement ribs 7 are installed, the steel bars 12 are welded between two adjacent groups of reinforcement ribs 7 on the same side wall; and the rubber pads 13 are fixed to the upper end surface of the horizontal plate 3 by adhesive; the operating personnel check whether each group of L-shaped support frames 2 is firmly installed. After acceptance, the upper end surfaces of each group of horizontal plates 3 on the same side are hoisted and placed with steel purlins. After checking that each group of steel purlins is placed stably, several groups of steel rods are installed between the steel plates and the steel purlins to realize the installation of the cantilever support structure of the foundation pit 14 at this level; after the installation is completed, continue to repeat the above steps to excavate the foundation pit 14 downwards until the required depth is reached; the present application improves the support strength of the L-shaped support frame 2 and ensures the support stability of the support structure.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cantilever deep foundation pit auxiliary support structure, characterized in that: The invention comprises an L-shaped support frame (2) fixed on the side wall of a concrete pile (1), wherein the L-shaped support frame (2) comprises a horizontal plate (3) and a vertical plate (4) integrally formed with the horizontal plate (3), wherein the vertical end face of the vertical plate (4) close to the concrete pile (1) is in the form of an arc structure that matches the shape of the vertical side wall of the concrete pile (1), and the vertical plate (4) is provided with a plurality of groups of through holes (5), and each group of the through holes (5) is penetrated and inserted with an expansion bolt (6) fixed to the concrete pile (1); and a reinforcing rib (7) is installed between the lower end face of the horizontal plate (3) and the end face of the vertical plate (4) away from the concrete.

2. A cantilever deep foundation pit auxiliary support structure according to claim 1, characterized in that: A vertically arranged fixing plate (8) is integrally formed on a vertical side wall of the horizontal plate (3) away from the vertical plate (4), and the fixing plate (8) is located at the upper end of the horizontal plate (3).

3. A cantilever deep foundation pit auxiliary support structure according to claim 2, characterized in that: The reinforcing rib (7) is integrally formed with a horizontally arranged horizontal wing plate (9) at one end close to the horizontal plate (3), and the reinforcing rib (7) is integrally formed with a vertically arranged vertical wing plate (10) at one end close to the vertical plate (4). A fastening bolt (11) is threadedly connected between the horizontal wing plate (9) and the horizontal plate (3), and a fastening bolt (11) is threadedly connected between the vertical wing plate (10) and the vertical plate (4).

4. A cantilever deep foundation pit auxiliary support structure according to claim 3, characterized in that: Each group of reinforcing ribs (7) is in a square frame structure.

5. The cantilever deep foundation pit auxiliary support structure according to claim 4 is characterized in that: Steel bars (12) are installed between any two groups of reinforcing ribs (7) located on the same side.

6. A cantilever deep foundation pit auxiliary support structure according to claim 5, characterized in that: The horizontal upper end surface of the horizontal plate (3) is covered with a rubber pad (13).

7. A cantilever deep foundation pit auxiliary support structure according to claim 6, characterized in that: The outer peripheral surface of each group of L-shaped support frames (2) is coated with a uniformly distributed anti-rust paint layer.

Images