Integrated combined foundation pit supporting structure

Abstract

The utility model discloses an integrated combined foundation pit supporting structure which comprises a steel pipe pile for supporting a soil body pit wall, the steel pipe pile comprises a steel pipe for pile and a steel pipe for anchoring, the two opposite side walls of the steel pipe for pile are communicated through the steel pipe for anchoring, and an anchor rod is fixed in the steel pipe for anchoring and anchored in a soil body. Through optimization design and prefabrication forming, the foundation pit supporting method has the advantages of being easy and convenient to construct, good in supporting effect, easy to control construction quality, wide in application range and the like, and is an efficient and reliable foundation pit supporting technology.

Description

Technical Field

[0001] The present application belongs to the technical field of building foundation pit support, and specifically relates to an integrated combined foundation pit support structure. Background Art

[0002] In foundation pit engineering, traditional support forms usually include steel sheet pile support, soil nail wall support and concrete cast-in-place pile support. These single support forms have their own advantages and disadvantages, but due to construction complexity and efficiency issues, it is often difficult to achieve efficient and high-quality construction results at the same time. Therefore, it is necessary to propose a new type of foundation pit combined support form to improve construction efficiency and support effect. Utility Model Content

[0003] The purpose of this application is to provide an integrated combined foundation pit support structure to solve the problem of limited function and effect of a single support form.

[0004] The purpose of this application is achieved through the following technical solutions:

[0005] An integrated combined foundation pit support structure includes steel pipe piles supporting the soil pit wall, the steel pipe piles include pile steel pipes and anchor steel pipes, the opposite side walls of the pile steel pipe are penetrated by the anchor steel pipe, and the anchor rods are fixed in the anchor steel pipe and anchored in the soil.

[0006] Furthermore, the pile steel pipes are arranged vertically.

[0007] Furthermore, pile foundation concrete is poured into the pile steel pipe.

[0008] Furthermore, at least two anchor steel pipes are arranged on the pile steel pipe.

[0009] Furthermore, the pile steel pipe and the anchor steel pipe are fixed by welding.

[0010] Furthermore, the anchor steel pipe is arranged obliquely to the left or right along a direction perpendicular to the pit wall.

[0011] Furthermore, the deflection angle of the anchor steel pipe is 5° to 10°.

[0012] Furthermore, the anchor steel pipes are alternately arranged along the vertical direction to be inclined to the left and to the right.

[0013] Furthermore, the anchor steel pipe is arranged obliquely downward in the horizontal direction.

[0014] Furthermore, the downward inclination angle of the anchor steel pipe is 20° to 30°.

[0015] Furthermore, the anchor rod comprises an anchor rod body, and anchor foundation concrete is poured between the anchor rod body and the anchor hole, and between the anchor rod body and the anchor steel pipe.

[0016] Furthermore, the top of the steel pipe pile is connected to the crown beam.

[0017] This application, through optimized design and prefabrication, has the advantages of simple construction, good support effect, easy control of construction quality, and wide application range. It is an efficient and reliable foundation pit support technology.

[0018] Beneficial effects of this application:

[0019] 1. Simple construction: The steel tube concrete piles and the guide steel pipes are prefabricated in an integrated manner, which simplifies the installation process of the anchor rods and reduces the on-site construction steps. During the construction process, the steel tube concrete piles are constructed first, and then the anchor rods are drilled into the guide steel pipes and grouting is carried out. The process is simple and easy to operate, which improves the construction efficiency.

[0020] 2. Good support effect: The integrated combination of steel tube concrete piles and anchor rods forms a multiple support system, which improves the soil structure strength and foundation pit support effect.

[0021] 3. The construction quality is easy to control: the prefabricated steel pipes and guide steel pipes are completed in the factory, and the quality is controllable. The integrated prefabrication of the guide steel pipe ensures the precise positioning of the guide hole and improves the construction quality.

[0022] 4. Strong adaptability: This support form is suitable for more variable and complex geological conditions, especially in soft soil and loose sand layers, and can effectively resist soil pressure and provide reliable support. The inclination angle and spacing of the guide steel pipe can be flexibly adjusted according to actual conditions to flexibly respond to different engineering needs.

[0023] The aforementioned main scheme of the present application and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection in the present application; and in the present application, (non-conflicting options) can also be freely combined with each other and with other options. After understanding the present scheme, those skilled in the art can understand that there are many combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present application, and they are not exhaustively listed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of this application.

[0025] Figure 2 It is a structural schematic diagram of the staggered arrangement of anchor steel pipes in this application.

[0026] In the figure: 1-steel pipe pile, 2-anchor rod, 3-soil, 4-cap beam; 101-steel pipe for pile, 102-pile foundation concrete, 103-steel pipe for anchor, 201-anchor rod body, 202-anchor foundation concrete. DETAILED DESCRIPTION

[0027] The present application is further described below in conjunction with specific embodiments and drawings.

[0028] refer to Figure 1 and Figure 2 As shown, an integrated combined foundation pit support structure includes steel pipe piles 1, anchor rods 2, soil 3 and cap beams 4. The support structure integrates steel pipe concrete piles and anchor rods, and simplifies the anchor rod installation process by reserving a guiding steel pipe inside the steel pipe, thereby solving the limitation of a single support structure and improving the support effect.

[0029] The steel pipe piles 1 are supported on the pit wall of the soil body 3, and the steel pipe piles 1 arranged in a row together form an action surface for supporting and enclosing the soil body 3. The top of the steel pipe pile 1 is connected to the crown beam 4, and the crown beam 4 integrates the support and force to ensure that the force and support are more reliable and uniform.

[0030] The anchor rod 2 uses the steel pipe pile 1 as the anchoring end. The anchor rod 2 is fixed on the steel pipe pile 1 and is anchored in the soil 3 at the same time, thereby integrating the two support forms, which not only has the stable and reliable support effect of the steel pipe pile 1, but also has the pull-out and anti-tilt support effect of the anchor rod 2.

[0031] The steel pipe pile 1 includes a steel pipe for pile 101, pile foundation concrete 102 and an anchor steel pipe 103. The steel pipe for pile 101 is arranged vertically and is a cylindrical steel pipe. The outer side of the steel pipe for pile 101 is used to form a supporting enclosure surface, which is in contact with the soil. Pile foundation concrete 102 is poured in the steel pipe for pile 101, and the pile foundation concrete 102 cooperates with the steel pipe for pile 101 to form the overall structure of the steel pipe pile 1. During construction, the steel pipe concrete pile is first constructed, and then the anchor rod is drilled through the guide steel pipe for grouting construction.

[0032] The opposite side walls of the pile steel pipe 101 are penetrated by the anchor steel pipe 103, that is, a hole is reserved on the pile steel pipe 101 for anchoring the anchor rod 2, and the diameter of the anchor steel pipe 103 is larger than the diameter of the anchor rod. The pile steel pipe 101 and the anchor steel pipe 103 are prefabricated in advance as a whole, and specifically, the pile steel pipe 101 and the anchor steel pipe 103 are welded and fixed.

[0033] At least two anchor steel pipes 103 are arranged on the pile steel pipe 101, and the anchor steel pipes 103 are arranged one by one in the vertical direction, and one anchor steel pipe 103 is arranged at a certain interval along the length direction of the steel pipe as needed. The anchor steel pipes 103 are arranged downwardly in the horizontal direction, and the downward angle of the anchor steel pipes 103 is 20° to 30°, so that the anchor rods 2 constructed later mainly resist the horizontal soil load, and also have a certain anti-floating effect.

[0034] The anchor steel pipe 103 is arranged to be tilted to the left or right along the direction perpendicular to the pit wall, and the tilt angle of the anchor steel pipe 103 is 5° to 10°, so that the anchor rod 2 applied later is also tilted to the left or right. The tilting of the anchor rod 2 to the left and right makes the anchoring effect more targeted and directional. The anchor steel pipe 103 is alternately arranged to be tilted to the left and right along the vertical direction to ensure that the anchoring effect is uniform and balanced.

[0035] The anchor rod 2 is fixed in the anchor steel pipe 103, which provides a basis for the subsequent construction of the anchor rod 2. The subsequent drilling, anchor rod lowering and concrete pouring are carried out through the anchor steel pipe 103. The completed anchor rod 2 and the anchor steel pipe 103 are arranged in the same direction and angle.

[0036] The anchor rod 2 includes an anchor rod body 201 and anchor foundation concrete 202. Anchor foundation concrete 202 is poured between the anchor rod body 201 and the anchor hole and between the anchor rod body 201 and the anchor steel pipe 103, so that the inner end of the anchor rod body is anchored in the soil 3, and the outer end is fixed on the steel pipe pile 1.

[0037] The construction process of this application:

[0038] 1. Prefabrication of steel pipes for piles and anchors: Prefabricate steel pipes according to design requirements, prefabricate holes according to the design direction and angle of the anchor steel pipes, and connect them through the inside of the pile steel pipes.

[0039] 2. Steel tube concrete pile construction: Prefabricated steel pipes are driven into the foundation pit according to the designed spacing, and concrete is poured inside the steel pipes for piles to form steel tube concrete piles.

[0040] 3. Anchor installation: Use the anchor drill bit to insert into the reserved hole of the anchor steel pipe to drill a hole. After the hole is formed, insert the anchor into the soil and the anchor steel pipe.

[0041] 4. Anchor rod sealing: After the anchor rod is inserted, grouting is performed to ensure that the anchor rod is tightly combined with the steel tube concrete pile and the surrounding soil.

[0042] In the specific example, the diameter of the steel tube concrete pile is 200mm, the pile spacing is 600mm, the pile length is 15m, the guide steel pipe diameter is 60mm, the pile core concrete strength grade is C30 concrete, the anchor rod diameter is 22mm, and 1:0.5 cement slurry is injected. A cap beam is set on the top of the pile, the cap beam height is 0.6m, the width is the same as the pile diameter, and the concrete strength grade is C30.

[0043] The anchor steel pipe is set vertically to the soil body and tilted downward by 25°. The spacing between the upper and lower anchor steel pipes is 3m, and the center of the end anchor steel pipe is 3m away from the pile end. Preferably, the direction and angle of the guide steel pipe are vertical to the soil body and tilted 5° to the left or right, and tilted 25° downward at the same time. The spacing between the upper and lower guide steel pipes is 3m. The guide steel pipe is tilted to the left and right from top to bottom along the length direction of the steel pipe, and reciprocates in sequence.

[0044] The aforementioned basic examples and their further selected examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection in this application. In the scheme of this application, each selected example can be arbitrarily combined with any other basic examples and selected examples.

[0045] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An integrated combined foundation pit support structure, comprising steel pipe piles (1) for supporting the pit wall of soil (3), characterized in that: The steel pipe pile (1) comprises a pile steel pipe (101) and an anchor steel pipe (103). The two opposite side walls of the pile steel pipe (101) are penetrated by the anchor steel pipe (103). The anchor rod (2) is fixed in the anchor steel pipe (103) and anchored in the soil (3).

2. The integrated combined foundation pit support structure according to claim 1 is characterized in that: The pile steel pipe (101) is arranged vertically.

3. The integrated combined foundation pit support structure according to claim 1 or 2, characterized in that: Pile foundation concrete (102) is poured inside the pile steel pipe (101).

4. The integrated combined foundation pit support structure according to claim 1 is characterized in that: At least two anchor steel pipes (103) are arranged on the pile steel pipe (101).

5. The integrated combined foundation pit support structure according to claim 1 or 4, characterized in that: The pile steel pipe (101) and the anchor steel pipe (103) are fixed by welding.

6. The integrated combined foundation pit support structure according to claim 1 or 4, characterized in that: The anchor steel pipe (103) is arranged obliquely to the left or right along a direction perpendicular to the pit wall; the oblique angle of the anchor steel pipe (103) is 5° to 10°.

7. The integrated combined foundation pit support structure according to claim 1 or 4, characterized in that: The anchor steel pipes (103) are alternately arranged along the vertical direction, slanting to the left and slanting to the right.

8. The integrated combined foundation pit support structure according to claim 1 or 4, characterized in that: The anchor steel pipe (103) is arranged downwardly slantingly in the horizontal direction; the downward slanting angle of the anchor steel pipe (103) is 20° to 30°.

9. The integrated combined foundation pit support structure according to claim 1 is characterized in that: The anchor rod (2) comprises an anchor rod body (201), and anchor foundation concrete (202) is poured between the anchor rod body (201) and the anchor hole, and between the anchor rod body (201) and the anchor steel pipe (103).

10. The integrated combined foundation pit support structure according to claim 1 is characterized in that: The top of the steel pipe pile (1) is connected to the crown beam (4).

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