Triangular buttress type retaining wall structure for foundation pit supporting and construction method

Abstract

The invention relates to the technical field of foundation pit supporting, and discloses a triangular buttress type retaining wall structure for foundation pit supporting and a construction method. The crown beam is arranged at the top of the continuous wall; the supporting mechanism comprises a retaining wall and an inclined pile which are integrally formed in a pouring mode, the retaining wall is a triangular counterfort type retaining wall, the two side edges of the retaining wall are connected with the continuous wall and the bottom face of the foundation pit respectively, the inclined pile is obliquely arranged on the third side edge of the retaining wall, one end of the inclined pile is connected with the top beam, and the end, away from the top beam, of the inclined pile is inserted into an inner soil body of the foundation pit. According to the method, a supporting structure does not need to be arranged in the excavation process of the foundation pit, a larger construction space is provided for construction, operation is convenient and fast, the construction time is shortened, and material consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit support, and in particular to a triangular buttress type retaining wall structure for foundation pit support and a construction method. Background Art

[0002] Foundation pit support refers to the measures taken to support, reinforce and protect the side walls of deep foundation pits and their surrounding environment in order to ensure the safety of underground structure construction and the surrounding environment of the foundation pit.

[0003] However, the existing foundation pit support method requires continuous construction of support structures during the excavation of the foundation pit, so as to maintain the stability and safety of the foundation pit through the internal support structure. This has the problems of complex structure, slow construction speed and high cost. Summary of the invention

[0004] The object of the present invention is to provide a triangular buttress retaining wall structure and a construction method for foundation pit support, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a triangular buttress retaining wall structure for foundation pit support, comprising:

[0006] Continuous wall, set in the foundation pit;

[0007] A crown beam, arranged at the top of the continuous wall;

[0008] The supporting mechanism includes an integrally cast retaining wall and inclined piles, wherein the retaining wall is a triangular buttress retaining wall, and both side edges of the retaining wall are respectively connected to the continuous wall and the bottom surface of the foundation pit, and the inclined piles are obliquely arranged on the third side edge of the retaining wall, one end of the inclined piles is connected to the crown beam, and the end of the inclined piles away from the crown beam is inserted into the internal soil of the foundation pit.

[0009] Optionally, the cap beam and the inclined pile are connected via a prism.

[0010] Optionally, the inclination angle between the inclined pile and the bottom surface of the foundation pit is 10°-20°.

[0011] Optionally, the retaining wall and the bottom of the inclined piles are located in the main body of the foundation pit.

[0012] Optionally, the top surface of the crown beam is flush with the ground outside the foundation pit.

[0013] Optionally, the retaining wall and the inclined piles are concrete structures.

[0014] Optionally, the continuous wall is a reinforced concrete structure.

[0015] Optionally, the prism is trapezoidal.

[0016] The present invention also provides a construction method of a triangular buttress retaining wall structure for foundation pit support, comprising the following steps:

[0017] Casting is performed in the foundation pit to form the continuous wall with the cap beam;

[0018] At a position lower than the bottom surface of the foundation pit, a construction device is used to cast from low to high along an oblique line toward the continuous wall in a swing spraying manner to form the retaining wall and the inclined piles.

[0019] Optionally, the construction device includes:

[0020] Vehicle body;

[0021] A spray bar is arranged on the vehicle body, and a rotatable spray head is arranged on the spray bar;

[0022] A rotating mechanism, disposed on the vehicle body, for driving the spray rod to rotate;

[0023] An adjusting mechanism is arranged on the vehicle body and is connected to the spraying rod, and is used for driving the spraying rod to move along an oblique line from low to high.

[0024] The present invention discloses the following technical effects: by casting an integrally formed retaining wall and inclined piles on the bottom surface of the continuous wall and the foundation pit, and connecting the inclined piles with the crown beam, the retaining wall, the inclined piles, the continuous wall and the crown beam are combined on the bottom surface of the foundation pit to form a whole, so that the support structure is more stable, so that there is no need to set up a supporting structure in the foundation pit during the excavation process, which provides a larger construction space for construction, is not only convenient to operate, but also shortens the construction time and saves material consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 It is a three-dimensional diagram of the support structure of the present invention;

[0027] Figure 2 It is a side view of the supporting structure of the present invention;

[0028] Figure 3 A top view of the supporting structure of the present invention;

[0029] Figure 4 It is a schematic diagram of the construction device of the present invention.

[0030] In the figure: 1. crown beam; 2. retaining wall; 3. inclined piles; 4. main body of foundation pit; 5. continuous wall; 6. ground outside the pit; 7. prism; 8. vehicle body; 9. spray rod; 10. rotating mechanism; 11. adjusting mechanism; 12. support plate; 13. rotating shaft; 14. hydraulic cylinder; 15. electric slide rail; 16. sliding frame; 17. counterweight frame; 18. spray head. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figure 1-Figure 4 The present invention provides a triangular buttress retaining wall structure for foundation pit support, comprising:

[0034] A continuous wall 5 is arranged in the foundation pit;

[0035] A cap beam 1 is arranged on the top of the continuous wall 5;

[0036] The supporting mechanism includes an integrally cast retaining wall 2 and inclined piles 3. The retaining wall 2 is a triangular buttress retaining wall. The two sides of the retaining wall 2 are respectively connected to the continuous wall 5 and the bottom surface of the foundation pit. The inclined piles 3 are obliquely arranged on the third side of the retaining wall 2. One end of the inclined piles 3 is connected to the crown beam 1, and the end of the inclined piles 3 away from the crown beam 1 is inserted into the internal soil of the foundation pit.

[0037] By casting the integrally formed retaining wall 2 and inclined piles 3 on the bottom surface of the continuous wall 5 and the foundation pit, and connecting the inclined piles 3 with the crown beam 1, the retaining wall 2, the inclined piles 3, the continuous wall 5 and the crown beam 1 are combined on the bottom surface of the foundation pit to form a whole, making the support structure more stable, so that there is no need to set up a supporting structure in the foundation pit during the excavation process, providing a larger construction space for construction, which is not only convenient to operate, but also shortens the construction time and saves material consumption.

[0038] In one embodiment of the present invention, the crown beam 1 and the inclined pile 3 are connected via a prism 7 , and the prism 7 can effectively improve the connection stability between the crown beam 1 and the inclined pile 3 .

[0039] In one embodiment of the present invention, the inclination angle between the inclined pile 3 and the bottom surface of the foundation pit is 10°-20°.

[0040] In one embodiment of the present invention, the bottoms of the retaining wall 2 and the inclined piles 3 are located in the foundation pit body 4 .

[0041] In one embodiment of the present invention, the top surface of the crown beam 1 is flush with the ground surface 6 outside the foundation pit.

[0042] In one embodiment of the present invention, the retaining wall and the inclined piles 3 are concrete structures.

[0043] In one embodiment of the present invention, the continuous wall 5 is a reinforced concrete structure.

[0044] In one embodiment of the present invention, the prism 7 is trapezoidal.

[0045] The present invention also provides a construction method of a triangular buttress retaining wall structure for foundation pit support, comprising the following steps:

[0046] Casting is performed in the foundation pit to form a continuous wall 5 with a crown beam 1. Specifically, after the guide wall is constructed, a troughing machine is used to perform troughing operations at a designated position of the foundation pit continuous wall 5, and a steel cage of a corresponding size is placed in the previously excavated underground continuous wall 5 trough section, and concrete is poured;

[0047] At a position lower than the bottom of the foundation pit, the construction device adopts the swing spraying method to cast from low to high along the diagonal line toward the continuous wall 5 to form the retaining wall 2 and the inclined pile 3. Specifically, a vibrating long spiral drill is used to drill holes at a designated position with an inclination of 10 to 20 degrees, and the sleeve is lowered during the drilling process to prevent the hole from collapsing. Before pulling out the sleeve, the hole is filled with high-quality wall protection mud. Adjust the angle of the nozzle 18 on the spray rod 9 so that it is facing the continuous wall 5 of the foundation pit for swing spraying, swinging about 30 degrees to the left and right. After completing the construction of the retaining wall 2 of this height, adjust the angle of the nozzle 18 on the spray rod 9 to be consistent with the rod direction, so that the spray rod 9 swings and sprays at an angle of about 300 degrees and reduces the spraying pressure (i.e., spraying 300 degrees in addition to 60 degrees) to form the inclined pile 3 structure of this height (the thickness of the retaining wall can be adjusted according to the swing spraying angle, depending on the needs of the actual project). After completing the above steps, lift the spray rod 9 upward to continue the construction of the next height until the overall construction is completed. As the height of the spraying rod 9 is raised, the spraying pressure is gradually reduced, and at the same time, the swing angle is increased to make the thickness of the retaining wall 2 basically consistent;

[0048] When the spraying rod 9 reaches the specified construction height, the spraying is stopped.

[0049] According to the actual project situation, more than 5 supporting structures are constructed along the continuous wall at equal intervals according to the above steps. After the construction of the foundation pit support system is completed, the foundation pit dewatering excavation is carried out.

[0050] like Figure 4 As shown, in one embodiment of the present invention, the construction device includes:

[0051] Body 8;

[0052] A spray bar 9 is arranged on the vehicle body 8, and a rotatable spray head 18 is arranged on the spray bar 9;

[0053] The rotating mechanism 10 is arranged on the vehicle body 8 and is used to drive the spray rod 9 to rotate. The rotating mechanism 10 is an electric slip ring, and the electric slip ring housing drives the spray rod 9 to rotate 360 ​​degrees to realize the spray swing.

[0054] An adjusting mechanism 11 is disposed on the vehicle body 8, and the adjusting mechanism 11 is connected to the spraying rod 9, and is used to drive the spraying rod 9 to move along an oblique line from low to high;

[0055] Furthermore, the adjustment mechanism 11 includes a support plate 12, which is rotatably connected to the vehicle body 8 via a rotating shaft 13, a hydraulic cylinder 14 is hinged between the support plate 12 and the vehicle body 8, an electric slide rail 15 is provided on the support plate 12, and a sliding frame 16 is slidably connected to the slider end of the electric slide rail 15, and the sliding frame 16 is connected to the rotating mechanism 10.

[0056] The tilt angle of the support plate 12 is adjusted by the hydraulic cylinder 14, thereby adjusting the tilt angle of the tilt pile 3, and the sliding frame 16 is driven to slide by the electric slide rail 15, so as to realize the retaining wall 2 and the tilt pile 3 cast in one piece from low to high.

[0057] Furthermore, a controller is provided on the vehicle body, and the controller is electrically connected to the rotating mechanism 10, the hydraulic cylinder 16 and the electric slide rail 17, and is used to adjust the state of each structure during use. The controller includes an electronic screen and a control system integrated inside the electronic screen.

[0058] Furthermore, a plurality of counterweight racks 17 are provided on the vehicle body 8 for placing counterweight blocks to improve the stability of the vehicle body 8 .

[0059] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A triangular buttress retaining wall structure for foundation pit support, characterized in that: include: A continuous wall (5) is arranged in the foundation pit; A crown beam (1) is arranged on the top of the continuous wall (5); The supporting mechanism comprises an integrally cast retaining wall (2) and an inclined pile (3), wherein the retaining wall (2) is a triangular buttress retaining wall, and the two sides of the retaining wall (2) are respectively connected to the continuous wall (5) and the bottom surface of the foundation pit, and the inclined pile (3) is obliquely arranged on the third side of the retaining wall (2), one end of the inclined pile (3) is connected to the crown beam (1), and the end of the inclined pile (3) away from the crown beam (1) is inserted into the internal soil of the foundation pit.

2. A triangular buttress retaining wall structure for foundation pit support according to claim 1, characterized in that: The crown beam (1) and the inclined pile (3) are connected via a prism (7).

3. The triangular buttress retaining wall structure for foundation pit support according to claim 1, characterized in that: The inclination angle between the inclined pile (3) and the bottom surface of the foundation pit is 10°-20°.

4. The triangular buttress retaining wall structure for foundation pit support according to claim 1, characterized in that: The bottoms of the retaining wall (2) and the inclined piles (3) are located inside the foundation pit body (4).

5. The triangular buttress retaining wall structure for foundation pit support according to claim 1, characterized in that: The top surface of the crown beam (1) is flush with the ground surface (6) outside the foundation pit.

6. The triangular buttress retaining wall structure for foundation pit support according to claim 1, characterized in that: The retaining wall and the inclined piles (3) are concrete structures.

7. The triangular buttress retaining wall structure for foundation pit support according to claim 1, characterized in that: The continuous wall (5) is a reinforced concrete structure.

8. The triangular buttress retaining wall structure for foundation pit support according to claim 2, characterized in that: The prism (7) is trapezoidal.

9. A construction method for a triangular buttress retaining wall structure for foundation pit support, based on the triangular buttress retaining wall structure for foundation pit support according to any one of claims 1 to 8, characterized in that: The following steps are involved: Casting is performed in the foundation pit to form the continuous wall (5) with the cap beam (1); At a position lower than the bottom surface of the foundation pit, a construction device is used to cast from low to high along an oblique line toward the continuous wall (5) in a swing spraying manner to form the retaining wall (2) and the inclined piles (3).

10. The construction method of a triangular buttress retaining wall structure for foundation pit support according to claim 9, characterized in that: The construction device comprises: Vehicle body (8); A spray bar (9) is arranged on the vehicle body (8), and a rotatable spray head (18) is arranged on the spray bar (9); A rotating mechanism (10) is arranged on the vehicle body (8) and is used to drive the spraying rod (9) to rotate; An adjusting mechanism (11) is arranged on the vehicle body (8); the adjusting mechanism (11) is connected to the spraying rod (9) and is used to drive the spraying rod (9) to move along an oblique line from low to high.

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