Construction method for improving stability of foundation pit slope

Abstract

The invention relates to the field of foundation pit slope construction, in particular to a construction method for improving the stability of a foundation pit slope, which comprises the following steps of: connecting reformed rivet pipes together in a threaded manner, inserting a vertical rivet pipe into a vertical rivet pipe inserting hole, inserting an inclined rivet pipe into an inclined rivet pipe inserting hole, and inserting the inclined rivet pipe into the vertical rivet pipe inserting hole; the inner end of the inclined riveting pipe can be connected to the vertical riveting pipe to form an integral structure, the integral stability of the foundation pit slope can be improved, the risk of collapse and landslide can be reduced, when concrete is poured into the inserting holes, the concrete can be reserved into the vertical riveting pipe inserting holes and the inclined riveting pipe inserting holes along the through holes, and the concrete is prevented from falling off. The vertical riveting pipes, the vertical reinforcing steel bar pipes, the inclined riveting pipes and the inclined reinforcing steel bar pipes are solidified together through the concrete and firmly bonded with the foundation, high firmness is achieved, the overall stability can be improved accordingly, the reinforcing mesh is laid on the inclined slope face of the foundation pit and fixed through the anchor rods, the reinforcing mesh can be firmly pressed and fixed to the inclined face of the foundation pit, and therefore the foundation pit is protected. After concrete is laid, water and soil loss of the slope of the foundation pit can be prevented.

Description

Technical Field

[0001] The invention relates to the field of foundation pit slope construction methods, in particular to a construction method for improving the stability of foundation pit slopes. Background Art

[0002] The foundation pit is a pit dug at the design location of the foundation according to the base elevation and the plane size of the foundation. Before excavation, the excavation plan should be determined based on geological and hydrological data and the situation of nearby buildings on site, and waterproofing and drainage should be done. If the excavation is not deep, the slope can be used to stabilize the slope. The slope size is determined according to relevant construction regulations. For deeper excavations and nearby buildings, the foundation pit wall support method and shotcrete wall protection method can be used. Large foundation pits can even use underground continuous walls and column-type bored pile interlocking methods to prevent the outer soil layer from collapsing. If there is no impact on nearby buildings, the well point method can be used to lower the groundwater level and use slope open excavation. In cold areas, natural cold air freezing method can be used for excavation, etc.

[0003] The retaining structure, groundwater control, environmental protection and other measures required to ensure the safety and stability of the underground space formed by excavation from the ground during the construction of the underground structure are called foundation pit engineering. Foundation pit engineering is a system engineering that integrates geological engineering, geotechnical engineering, structural engineering and geotechnical testing technology. Its main contents include engineering survey, support structure design and construction, earth excavation and backfilling, groundwater control, information construction and surrounding environmental protection. The simplest and most economical way to construct a foundation pit is to excavate on a larger slope, but it is often restricted by site conditions and the surrounding environment, so it is necessary to design a support system to ensure the smooth progress of construction and better protect the surrounding environment.

[0004] The traditional foundation pit slope construction method cannot connect the vertical and oblique rivet pipes together to form an integral, stable anti-slide and anti-collapse structure. The concrete poured into the socket is difficult to firmly bond the rivet pipe to the foundation, and the poor firmness will affect the overall stability.

[0005] In view of this, we propose a construction method for improving the stability of foundation pit slope in order to solve the problems existing in the existing device. Summary of the invention

[0006] The purpose of the present invention is to provide a construction method for improving the stability of foundation pit slopes, so as to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions: a construction method for improving the stability of foundation pit slopes, the specific steps are as follows: (S1) Vertical drilling: Drill multiple vertical rivet pipe holes vertically from top to bottom on the upper edge of the excavated foundation pit; (S2) Oblique drilling: On the inclined surface of the foundation pit, two oblique rivet pipe insertion holes are drilled in the direction of the vertical rivet pipe insertion hole, and the inner ends of the oblique rivet pipe insertion holes are connected to the vertical rivet pipe insertion hole; (S3) Rivet pipe modification: multiple groups of through holes are opened on the vertical riveted pipe, multiple groups of through holes are opened on the oblique riveted pipe, two threaded connection pipes are welded on the vertical riveted pipe, and internal threads matching the threaded connection pipes are opened on the inner wall of the extension end of the oblique riveted pipe; (S4) inserting the rivet tube: inserting the vertical rivet tube into the vertical rivet tube insertion hole, and inserting the oblique rivet tube (5) into the oblique rivet tube insertion hole; (S5) Connecting the riveted tube: aligning the internal thread of the inner end of the oblique riveted tube with the external thread on the threaded connection tube, rotating the oblique riveted tube, and threading it onto the vertical riveted tube; (S6) Inserting the steel bar pipe: inserting the vertical steel bar pipe into the vertical riveted pipe, and inserting the oblique steel bar pipe into the oblique riveted pipe; (S7) pouring concrete: pouring concrete into the vertical rivet pipe insertion hole, and pouring concrete into the oblique rivet pipe insertion hole; (S8) Surface laying: Lay the steel mesh flat on the slope of the foundation pit and use anchor rods to nail the steel mesh to the slope of the foundation pit; (S9) Surface concrete laying: pouring concrete on the steel mesh.

[0007] Preferably, in the step (S1), the diameter of the vertical rivet pipe insertion hole is 8 cm, the inner diameter is 7 cm, and the depth of the vertical rivet pipe insertion hole is greater than the depth of the foundation pit.

[0008] Preferably, in the step (S2), the diameter of the oblique rivet pipe hole is 8 cm, the inner diameter is 7 cm, the inclination angle of the oblique rivet pipe hole is not less than 25°, the spacing between the two threaded connecting pipes is measured, the depth of the vertical rivet pipe hole, the distance between the two threaded connecting pipes and the bottom of the vertical rivet pipe hole are recorded, the drilling position and angle of the oblique rivet pipe hole are calculated, and then drilling is performed using an electric drill and a drill rod.

[0009] Preferably, in the step (S3), a set of turning handles are welded on the surface of the outer end of the oblique riveted tube.

[0010] Preferably, in the step (S5), after the internal thread at the inner end of the oblique riveted tube is aligned with the external thread on the threaded connecting tube, the construction worker holds the handle on the oblique riveted tube with both hands and rotates the vertical riveted tube to tighten it on the threaded connecting tube.

[0011] Preferably, in the step (S7), when pouring concrete, the vertical steel pipe and the oblique steel pipe are struck with a hammer, so that both generate vibrations, which can vibrate the surrounding concrete and improve the fullness of the concrete pouring.

[0012] Preferably, in the step (S8), multiple whip side clamps are welded and fixed obliquely on both sides of the anchor rod, and the angle between the side clamps and the anchor rod is not greater than 45°. A pressure plate is prefabricated, and a square thin steel plate with a side length of 10 cm and a thickness of 0.3 cm is taken, a hole is opened at the center, and the plate is put on the anchor rod and welded and fixed, and then the processed anchor rod is vertically nailed to the inclined surface of the foundation pit; Preferably, in the step (S9), the concrete on the surface of the foundation slope is smoothed.

[0013] Compared with the prior art, the invention has the beneficial effects.

[0014] In the present invention, the rivet pipe is modified so that the two can be threadedly connected together, an oblique rivet pipe insertion hole that is connected with the vertical rivet pipe insertion hole is drilled on the inclined surface of the foundation pit, the vertical rivet pipe is inserted into the vertical rivet pipe insertion hole, and the oblique rivet pipe is inserted into the oblique rivet pipe insertion hole. The inner end of the oblique rivet pipe can be connected to the vertical rivet pipe to form an integral structure, which can improve the overall stability of the foundation pit slope and reduce the risk of collapse and landslide.

[0015] In the present invention, when pouring concrete into the insertion hole, the concrete can flow into the vertical rivet pipe insertion hole and the oblique rivet pipe insertion hole along the through hole, so that the concrete solidifies the vertical rivet pipe, the vertical steel pipe, the oblique rivet pipe and the oblique steel pipe together, and firmly bonds with the foundation, has strong firmness, and thus improves the overall stability.

[0016] In the present invention, a steel mesh is laid on the slope of the foundation pit and fixed with anchor rods, so that the steel mesh can be firmly pressed on the slope of the foundation pit. After laying concrete, soil and water loss on the slope of the foundation pit can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention during construction; Figure 3 It is a schematic diagram of the structure of the connection between the vertical riveted tube and the oblique riveted tube in the present invention; Figure 4 It is a structural schematic diagram of the oblique riveted pipe after modification in the present invention; Figure 5 It is a structural schematic diagram of the anchor rod after transformation in the present invention; Figure 6 For the present invention Figure 2 Schematic diagram of the structure enlarged at point A in the middle.

[0018] In the figure: 1. vertical riveted pipe insertion hole; 2. oblique riveted pipe insertion hole; 3. vertical riveted pipe; 4. threaded connecting pipe; 5. oblique riveted pipe; 6. through hole; 7. vertical steel pipe; 8. oblique steel pipe; 9. steel mesh; 10. anchor rod; 11. side clamp; 12. pressure plate. DETAILED DESCRIPTION

[0019] 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 technical personnel in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figures 1 to 6 The present invention provides a technical solution: a construction method for improving the stability of foundation pit slope, the specific steps are as follows: (S1) Vertical drilling: Drill multiple vertical rivet pipe insertion holes 1 vertically from top to bottom on the upper edge of the excavated foundation pit; (S2) Oblique drilling: On the inclined surface of the foundation pit, two oblique rivet pipe insertion holes 2 are drilled in the direction of the vertical rivet pipe insertion hole 1, and the inner ends of the oblique rivet pipe insertion holes 2 are connected to the vertical rivet pipe insertion hole 1; (S3) Rivet pipe modification: multiple groups of through holes 6 are opened on the vertical riveted pipe 3, multiple groups of through holes 6 are opened on the oblique riveted pipe 5, two threaded connection pipes 4 are welded to the vertical riveted pipe 3, and internal threads matching the threaded connection pipes 4 are opened on the inner wall of the extension end of the oblique riveted pipe 5; (S4) Inserting the rivet tubes: inserting the vertical rivet tube 3 into the vertical rivet tube insertion hole 1, and inserting the oblique rivet tube 5 into the oblique rivet tube insertion hole 2; (S5) Connecting the riveted tubes: aligning the internal thread of the inner end of the oblique riveted tube 5 with the external thread on the threaded connection tube 4, rotating the oblique riveted tube 5, and threading it onto the vertical riveted tube 3; (S6) Inserting the steel bar pipes: inserting the vertical steel bar pipe 7 into the vertical riveted pipe 3, and inserting the oblique steel bar pipe 8 into the oblique riveted pipe 5; (S7) pouring concrete: pouring concrete into the vertical rivet pipe insertion hole 1, and pouring concrete into the oblique rivet pipe insertion hole 2; (S8) Surface laying: the steel mesh 9 is laid flat on the slope of the foundation pit, and the steel mesh 9 is nailed to the slope of the foundation pit using anchor rods 10; (S9) Surface concrete laying: Pour concrete on the steel mesh and smooth the surface concrete.

[0021] In this embodiment, in step S1, the diameter of the vertical riveted pipe insertion hole 1 is 8 cm, the inner diameter is 7 cm, and the depth of the vertical riveted pipe insertion hole 1 is greater than the depth of the foundation pit; In this embodiment, in step S2, the diameter of the oblique rivet pipe insertion hole 2 is 8 cm, the inner diameter is 7 cm, the inclination angle of the oblique rivet pipe insertion hole 2 is not less than 25°, the distance between the two threaded connecting pipes 4 is measured, the depth of the vertical rivet pipe insertion hole 1, the distance between the two threaded connecting pipes 4 and the bottom of the vertical rivet pipe insertion hole 1 are recorded, the drilling position and angle of the oblique rivet pipe insertion hole 2 are calculated, and then the electric drill and the drill rod are used to drill; In this embodiment, in step S3, a set of turning handles are welded on the surface of the outer end of the oblique riveted tube 5; In this embodiment, in step S5, after the internal thread of the inner end of the oblique riveted tube 5 is aligned with the external thread on the threaded connection tube 4, the construction worker holds the turning handle on the oblique riveted tube 5 with both hands and rotates the vertical riveted tube 3 to tighten it on the threaded connection tube 4; In this embodiment, in step S7, when pouring concrete, the vertical steel pipe 7 and the oblique steel pipe 8 are struck with a hammer, and the two generate vibrations, which can vibrate the surrounding concrete and improve the fullness of the concrete pouring; In this embodiment, in step S8, multiple whip side clamps 11 are welded and fixed obliquely on both sides of the anchor rod 10, and the angle between the side clamps 11 and the anchor rod 10 is not greater than 45°. The pressure plate 12 is prefabricated, and a square thin steel plate with a side length of 10 cm and a thickness of 0.3 cm is taken. A hole is opened at the center, and it is put on the anchor rod 10 and welded and fixed, and then the processed anchor rod 10 is vertically nailed to the inclined surface of the foundation pit; In this embodiment, in step S9, the concrete on the surface of the foundation slope is smoothed.

[0022] Principle of improving the stability of foundation pit slope: the modified rivet pipes can be threaded together, the vertical rivet pipe 3 is inserted into the vertical rivet pipe socket 1, and the oblique rivet pipe 5 is inserted into the oblique rivet pipe socket 2. The inner end of the oblique rivet pipe 5 can be connected to the vertical rivet pipe 3 to form an integral structure, which can improve the overall stability of the foundation pit slope and reduce the risk of collapse and landslide. When pouring concrete into the socket, the concrete can flow along the through hole 6 into the vertical rivet pipe socket 1 and the oblique rivet pipe socket 2, so that the concrete solidifies the vertical rivet pipe 3, the vertical steel pipe 7, the oblique rivet pipe 5 and the oblique steel pipe 8 together, and firmly adheres to the foundation, has strong firmness, and will thereby improve the overall stability. A steel mesh 9 is laid on the inclined slope surface of the foundation pit and fixed with an anchor rod 10. The steel mesh 9 can be firmly pressed and fixed on the inclined surface of the foundation pit. After laying concrete, soil and water loss on the inclined surface of the foundation pit can be prevented.

[0023] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0024] In the description of the present invention, unless otherwise specified, "multiple" means two or more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does 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 cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A construction method for improving the stability of foundation pit slope, characterized in that: The specific steps are as follows: (S1) Vertical drilling: Drill multiple vertical rivet pipe insertion holes (1) vertically from top to bottom on the upper edge of the excavated foundation pit; (S2) Oblique drilling: on the inclined surface of the foundation pit, two oblique rivet tube insertion holes (2) are drilled in the direction of the vertical rivet tube insertion hole (1), and the inner ends of the oblique rivet tube insertion holes (2) are connected to the vertical rivet tube insertion hole (1); (S3) Riveted tube modification: multiple groups of through holes (6) are provided on the vertical riveted tube (3), multiple groups of through holes (6) are also provided on the oblique riveted tube (5), two threaded connection tubes (4) are welded to the vertical riveted tube (3), and internal threads matching the threaded connection tubes (4) are provided on the inner wall of the extension end of the oblique riveted tube (5); (S4) inserting the rivet tube: inserting the vertical rivet tube (3) into the vertical rivet tube insertion hole (1), and inserting the oblique rivet tube (5) into the oblique rivet tube insertion hole (2); (S5) Connecting the riveted tubes: aligning the internal thread of the inner end of the oblique riveted tube (5) with the external thread on the threaded connection tube (4), rotating the oblique riveted tube (5), and threading it onto the vertical riveted tube (3); (S6) Inserting the steel bar pipe: inserting the vertical steel bar pipe (7) into the vertical riveted pipe (3), and inserting the oblique steel bar pipe (8) into the oblique riveted pipe (5); (S7) pouring concrete: pouring concrete into the vertical rivet pipe insertion hole (1), and pouring concrete into the oblique rivet pipe insertion hole (2); (S8) Surface laying: laying the steel mesh (9) flat on the inclined surface of the foundation pit, and using anchor rods (10) to nail the steel mesh (9) to the inclined surface of the foundation pit; (S9) Surface concrete laying: Pour concrete on the steel mesh and smooth the surface concrete.

2. A winter mixing station production insulation construction method according to claim 1, characterized in that: In the step (S1), the diameter of the vertical riveted pipe insertion hole (1) is 8 cm, the inner diameter is 7 cm, and the depth of the vertical riveted pipe insertion hole (1) is greater than the depth of the foundation pit.

3. A winter mixing station production insulation construction method according to claim 1, characterized in that: In the step (S2), the diameter of the oblique rivet pipe insertion hole (2) is 8 cm, the inner diameter is 7 cm, the inclination angle of the oblique rivet pipe insertion hole (2) is not less than 25°, the distance between the two threaded connection pipes (4) is measured, the depth of the vertical rivet pipe insertion hole (1), the distance between the two threaded connection pipes (4) and the bottom of the vertical rivet pipe insertion hole (1) are recorded, the drilling position and angle of the oblique rivet pipe insertion hole (2) are calculated, and then the electric drill and the drill rod are used to drill the hole.

4. A winter mixing station production insulation construction method according to claim 1, characterized in that: In the step (S3), a set of turning handles are welded on the surface of the outer end of the oblique riveted tube (5).

5. A winter mixing station production insulation construction method according to claim 1, characterized in that: In the step (S5), after the internal thread at the inner end of the oblique riveted tube (5) is aligned with the external thread on the threaded connection tube (4), the construction worker holds the turning handle on the oblique riveted tube (5) with both hands and rotates the vertical riveted tube (3) to tighten it onto the threaded connection tube (4).

6. A winter mixing station production insulation construction method according to claim 1, characterized in that: In the step (S7), when pouring concrete, the vertical steel pipe (7) and the oblique steel pipe (8) are struck with a hammer, so that the two generate vibrations, which can cause the surrounding concrete to vibrate, thereby improving the fullness of the concrete pouring.

7. A winter mixing station production insulation construction method according to claim 1, characterized in that: In the step (S8), a plurality of whip side clamps (11) are welded and fixed obliquely on both sides of the anchor rod (10), wherein the angle between the side clamps (11) and the anchor rod (10) is not greater than 45°. A pressure plate (12) is prefabricated, and a square thin steel plate with a side length of 10 cm and a thickness of 0.3 cm is taken. A hole is opened at the center of the square thin steel plate, which is put on the anchor rod (10) and fixed by welding. Then, the processed anchor rod (10) is vertically nailed to the inclined surface of the foundation pit.

8. The winter production insulation construction method of a mixing station according to claim 1 is characterized by: In the step (S9), the concrete on the surface of the foundation slope is smoothed.

Images