A stable building support structure applied to a foundation pit terrain

Abstract

The application discloses a stable building supporting structure applied to a foundation pit terrain, which comprises a foundation pit, a reinforcing layer filled outside the foundation pit, a supporting pile arranged on the side of a building close to the foundation pit, and fixed connection between the reinforcing layer and the supporting pile through a fixing piece; the upper end of the supporting pile is fixedly connected with a crown beam, the side of the crown beam away from the foundation pit is fixedly connected with a metal cover plate, the side of the metal cover plate away from the foundation pit is fixedly connected with a concrete bottom plate, and the lower end of the concrete bottom plate is sequentially fixed with a bearing platform and a pile foundation. The application can effectively improve the stability of the side stratum, reduce the lateral pressure of the soil layer of the foundation pit side on the supporting pile, and prevent the deformation of the side edge of the foundation pit by grouting outside the foundation pit to form a fixed layer. The application connects the supporting pile and the fixed layer through the fixing piece, improves the stability of the supporting pile, and has simple and easy-to-operate construction mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building engineering, in particular to a stable building support structure applied to foundation pit topography. BACKGROUND

[0002] Bored pile + steel support support is a commonly used support method in deep foundation pit engineering, which can balance the lateral pressure received by the two sides of the retaining pile by using internal support. The symmetry of the stratum on both sides of the foundation pit is required to be high. However, in actual engineering, the stratum on both sides of the foundation pit often has a large difference. In this kind of foundation pit, pile support will make the support structure unbalanced in stress, and there is a great safety hazard in constructing buildings on this kind of topography.

[0003] Zhou Chuan, Li Xiaolin, Li Yatao, et al. analyzed the construction process and stress characteristics of the asymmetric foundation pit (Zhou Chuan, Li Xiaolin, Li Yatao, Research on stress characteristics and treatment measures of asymmetric pile-strut support deep foundation pit [J]. Shanxi Architecture), and compared the treatment measures of various asymmetric stratum foundation pit engineering. The following rules are found: 1. In the asymmetric pile-strut support foundation pit with deep miscellaneous fill on one side, the horizontal displacement, bending moment and ground settlement of the retaining pile on the miscellaneous fill side are much larger than those of the symmetric stratum foundation pit. In the design and construction process, certain treatment measures must be taken for the asymmetric foundation pit to ensure the safety of the foundation pit; 2. Reinforcing the miscellaneous fill in the foundation pit can significantly reduce the horizontal displacement and ground settlement of the retaining pile, but has little effect on the bending moment of the retaining pile; 3. Reinforcing the miscellaneous fill outside the foundation pit can significantly reduce the horizontal displacement, bending moment and ground settlement of the retaining pile on the miscellaneous fill side, and with the increase of the reinforcement range, the horizontal displacement, bending moment and ground settlement of the retaining pile on the miscellaneous fill side gradually decrease, and the horizontal displacement and ground settlement of the retaining pile on the other side slowly increase, and there is a suitable reinforcement range that can make the foundation pit have better symmetry; 4. The effect of reinforcing the miscellaneous fill inside and outside the foundation pit is not much different from that of reinforcing only the miscellaneous fill outside the foundation pit. Through the summary of the above rules, the following conclusions are obtained: 1. For the asymmetric pile-strut support foundation pit with large difference in stratum on both sides, the stratum on the poorer side should be reinforced; 2. When reinforcing the stratum on the poorer side, only the stratum outside the foundation pit can be reinforced, and by calculating the appropriate reinforcement range, the stress and deformation of the foundation pit can be restored to a certain symmetry.

[0004] When a building needs to be built near a foundation pit topography, due to the self-weight of the building, the lateral pressure borne by the supporting pile near the foundation pit side is larger, the horizontal displacement of the pile body, the ground settlement, and the bending moment of the enclosure pile are all larger than those of the supporting pile away from the foundation pit side. Since the pile foundation plays a major role in supporting the building, the pile foundation cannot be reinforced by driving anchor rods, and if such an operation is performed, the supporting strength of the foundation will be weakened; and when a bored pile or a cement mixing pile is used alone as a supporting pile, problems of insufficient lateral stiffness and poor support will occur.

[0005] To solve the above problems, a technical solution is proposed in the utility model patent with the application number CN201721015597.2 and the name “Building support structure applied to foundation pit topography”, which transmits the self-weight of the building to the unbonded prestressed anchor cable through the concrete bottom plate, the self-weight makes the unbonded prestressed anchor cable have higher anchoring force, this part of the anchoring force and the supporting pile jointly play a supporting role, and based on the prestressed principle, the supporting form has good self-structure performance. On the basis of the utility model patent, the utility model patent with the application number CN202020688062.7 and the name “Stable building support structure applied to foundation pit topography” improves the solution of the foregoing utility model patent, and the fixed part is fixedly connected to the side of the foundation pit, the fixed part is fixedly connected with the fixed clamp, and the fixed clamp is fixedly connected with the supporting pile, so as to improve the fixing effect of the supporting pile. However, in the above-mentioned patent technology, only the anchor cable is used to disperse the pressure on the side near the supporting pile, and the stratum structure on the side of the foundation pit is not improved, and there is still a risk of poor stability when building a building at the foundation pit topography. In order to improve this problem, based on the research results of the above-mentioned asymmetric foundation pit of stratum, the present application proposes a stable building support structure applied to foundation pit topography. SUMMARY

[0006] The present application aims to provide a stable building support structure applied to foundation pit topography, which can reinforce the building support at the foundation pit topography.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solution: a stable building support structure applied to foundation pit topography, comprising a foundation pit, a fixed layer is filled outside the foundation pit, a supporting pile is arranged on the side of the building near the foundation pit, and the fixed layer and the supporting pile are fixedly connected through a fixed part; the upper end of the supporting pile is fixedly connected with a corbel, the side of the corbel away from the foundation pit is fixedly connected with a metal cover plate, the side of the metal cover plate away from the foundation pit is fixedly connected with a concrete bottom plate, and the lower end of the concrete bottom plate is sequentially fixed with a pile cap and a pile foundation.

[0008] Preferably, the fixing member is a steel bar, and the steel bar is inserted into the support pile hole from the inner side of the foundation pit, and a plurality of steel bars are arranged in each support pile hole from top to bottom.

[0009] Preferably, grouting is performed on the outer side of the foundation pit to form a fixing layer, and the fixing layer is fixedly connected with the steel bar after solidification.

[0010] Preferably, concrete is poured into the support pile hole to form a support pile, and the support pile is fixedly connected with the steel bar after solidification.

[0011] Preferably, a support frame is fixed on the inner side of the foundation pit, the support frame comprises a first support plate abutting the bottom wall of the foundation pit and a second support plate abutting the side wall of the foundation pit, and a plug column is fixed on the abutting surface of the first support plate and the second support plate.

[0012] Preferably, a through hole is formed on the surface of the second support plate for the fixing member to pass through.

[0013] Preferably, the metal cover plate is hollow and filled with an elastic material.

[0014] A construction method of a stable building support structure applied to a foundation pit terrain is as follows:

[0015] In the first step, the coordinates of the site are determined, including the coordinates of the concrete bottom plate and the support pile adjacent to the foundation pit; in the second step, the support pile hole is excavated by drilling, and the steel cage is lowered;

[0016] In the third step, drilling is performed from the inner side of the foundation pit to the support pile hole, and the fixing member is placed after drilling to insert the fixing member into the support pile hole;

[0017] In the fourth step, grouting is performed on the outer side of the foundation pit to form a fixing layer;

[0018] In the fifth step, concrete is poured into the support pile hole to form a support pile, the top of the support pile is reserved with a steel bar, and the steel bar is arranged on the inner surface of the corbel to pour concrete on the corbel, so that the corbel and the support pile are fixed.

[0019] Compared with the prior art, the beneficial effects of the present application are as follows:

[0020] The present application can effectively improve the stability of the side stratum by grouting on the outer side of the foundation pit to form a fixing layer, reduce the lateral pressure of the support pile on the side soil layer of the foundation pit, and prevent the deformation of the side edge of the foundation pit.

[0021] Secondly, the fixing member connects the support pile with the fixing layer, improves the stability of the support, and the construction method is simple and easy to operate. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The first step of the construction method of the embodiment 1 of the present application is shown in the figure;

[0023] Figure 2 Schematic diagram of the second step of the construction method of the embodiment 1 of the present application;

[0024] Figure 3 Schematic diagram of the third step of the construction method of the embodiment 1 of the present application;

[0025] Figure 4 Schematic diagram of the fourth and fifth steps of the construction method of the embodiment 1 of the present application;

[0026] Figure 5 Schematic diagram of the structure of the embodiment 2 of the present application;

[0027] In the figure: 1 - foundation pit, 2 - support pile hole, 3 - fixing member, 4 - support pile, 5 - fixing layer, 6 - crown beam, 7 - metal cover plate, 8 - concrete bottom plate, 9 - building body, 10 - pile cap, 11 - pile foundation, 12 - first support plate, 13 - second support plate, 14 - inserted column. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] Embodiment 1

[0030] Please refer to Figures 1 to 4 The present application provides a technical solution: a stable building support structure applied to the terrain of a foundation pit, comprising a foundation pit 1, a fixing layer 5 filled outside the foundation pit 1, a support pile 4 arranged on the side of the building close to the foundation pit 1, and a fixing member 3 fixedly connected between the fixing layer 5 and the support pile 4. The fixing member 3 in the embodiment is a steel bar, and the steel bar is inserted from the inside of the foundation pit 1 into a support hole 2. A plurality of steel bars are arranged in each support pile hole 2 from top to bottom. The fixing layer is formed by grouting outside the foundation pit 1, and the fixing layer is fixedly connected with the steel bars after solidification. The support pile 4 is formed by pouring concrete into the support pile hole 2, and the support pile 4 is fixedly connected with the steel bars after solidification. The support structure can reinforce the soil layer structure on the side of the foundation pit 1, and effectively reduce the horizontal displacement of the support pile 4 and the ground subsidence.

[0031] The upper end of the support pile 4 is fixedly connected with the crown beam 6, the side of the crown beam 6 away from the foundation pit 1 is fixedly connected with the metal cover plate 7, the metal cover plate 7 is hollow and filled with elastic material, and the elastic material is asphalt and asbestos mixture. The side of the metal cover plate 7 away from the foundation pit 1 is fixedly connected with the concrete bottom plate 8, the lower end of the concrete bottom plate 8 is sequentially fixed with the pile cap 10 and the pile foundation 11, and the upper end of the concrete bottom plate 8 bears the building body 9, and the building body 9 is fixedly connected with the concrete bottom plate 8.

[0032] A construction method of a stable building support structure applied to the terrain of the foundation pit 1 is as follows:

[0033] Firstly, measurement and line laying are performed to determine the coordinates of the site, including the coordinates of the concrete bottom plate 8 and the support pile 4 near the foundation pit;

[0034] Secondly, the support pile hole 2 is dug out by drilling, the support pile hole 2 is dug by section, each section is dug down by 1m, and the support wall is constructed by section until the design depth of the support 412 is reached and the reinforcement cage is inserted;

[0035] Thirdly, drilling is performed from the inside of the foundation pit 1 to the support pile hole 2, and the fixing member 3 is inserted into the support pile hole 2 after drilling;

[0036] Fourthly, grouting is performed on the outside of the foundation pit 1 to form the fixed layer 5;

[0037] Fifthly, the support pile 4 is formed by pouring concrete into the support pile hole 2, the top of the support pile 4 is reserved with reinforcement, and the reinforcement is arranged on the inner face of the crown beam 6 to pour concrete on the crown beam 6, so that the crown beam 6 and the support pile 4 are fixed.

[0038] Embodiment 2

[0039] Please refer to Figure 5 A stable building support structure applied to the terrain of the foundation pit 1, including the foundation pit 1, the fixed layer 5 filled outside the foundation pit 1, and the support pile 4 arranged on the side of the building near the foundation pit 1, and the fixed layer 5 and the support pile 4 are fixedly connected through the fixing member 3; the fixing member 3 in the embodiment is steel reinforcement, and the steel reinforcement is inserted into the support pile hole 2 from the inside of the foundation pit 1, and a plurality of steel reinforcements are arranged in each support hole 2 from top to bottom. Grouting is performed on the outside of the foundation pit 1 to form the fixed layer 5, and the fixed layer 5 is fixedly connected with the steel reinforcement after solidification. The support pile 4 is formed by pouring concrete into the support pile hole 2, and the support pile 4 is fixedly connected with the steel reinforcement after solidification. The support frame is fixed on the inside of the foundation pit 1, the support frame includes the first support plate 12 abutting with the bottom wall of the foundation pit 1 and the second support plate 13 abutting with the side wall of the foundation pit 1, the insertion column 14 is fixed on the abutting faces of the first support plate 12 and the second support plate 13. The through hole for the fixing member 3 to pass through is formed on the surface of the second support plate 13.

[0040] In this embodiment, one is to form the fixed layer 5 outside the foundation pit 1 by grouting, and the other is to support the inner side wall of the foundation pit 1 by the support frame, which can further improve the stability of the ground on the side of the building foundation pit 1.

[0041] A construction method of a stable building support structure applied to the foundation pit 1 terrain is as follows:

[0042] First, the measurement is performed, the site coordinates are determined, including the coordinates of the concrete bottom plate 8 and the support pile 4 near the foundation pit, and the support frame is fixed on the inner side of the corresponding foundation pit 1.

[0043] Second, the support pile hole 2 is dug out by drilling, the support hole 2 is dug by section, each section is dug down 1 meter, and the retaining wall is constructed by section until the design depth of the support pile 412 is reached.

[0044] Third, drill from the through hole on the surface of the second support plate 13 on the inner side of the foundation pit 1 into the support pile hole 2, and then put the fixing part 3 into the support hole 2 after drilling.

[0045] Fourth, grouting is performed on the outer side of the foundation pit 1 to form the fixed layer 5.

[0046] Fifth, pour concrete into the support pile hole 2 to form the support pile 4, the top of the support pile 4 is reserved with steel bars, and the steel bars are arranged on the inner surface of the corbel 6 to pour concrete on the corbel 6, so that the corbel 6 and the support pile 4 are fixed.

[0047] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A stable building support structure applied to a foundation topography, comprising a foundation pit (1), characterized in that: The fixed layer (5) is filled outside the foundation pit (1), the support pile (4) is arranged on the side of the building close to the foundation pit (1), and the fixed layer (5) and the support pile (4) are fixedly connected through the fixing piece (3); the upper end of the support pile (4) is fixedly connected with the crown beam (6), the side of the crown beam (6) away from the foundation pit (1) is fixedly connected with the metal cover plate (7), the side of the metal cover plate (7) away from the foundation pit (1) is fixedly connected with the concrete bottom plate (8), and the lower end of the concrete bottom plate (8) is sequentially fixed with the bearing platform (10) and the pile foundation (11); The fixing piece (3) is a reinforcing steel bar, and the reinforcing steel bar is inserted into the support pile hole (2) from the inside of the foundation pit (1); a plurality of reinforcing steel bars are arranged in each support pile hole (2) from top to bottom; The grouting is carried out outside the foundation pit (1) to form the fixed layer (5), and the fixed layer (5) is fixedly connected with the reinforcing steel bar after solidification; The concrete is poured into the support pile hole (2) to form the support pile (4), and the support pile (4) is fixedly connected with the reinforcing steel bar after solidification; The support frame is fixed in the inside of the foundation pit (1), the support frame comprises a first support plate (12) abutting the bottom wall of the foundation pit (1) and a second support plate (13) abutting the side wall of the foundation pit (1), and the insertion column (14) is fixed on the abutting surface of the first support plate (12) and the second support plate (13); The through hole is formed in the surface of the second support plate (13) for the fixing piece (3) to pass through.

2. The stable building support structure applied to the foundation topography according to claim 1, wherein: The metal cover plate (7) is hollow and filled with an elastic material.

3. The stable building support structure applied to a foundation topography according to claim 1, wherein The construction method is as follows: First step, determine the site coordinates, including the coordinates of the concrete bottom plate (8) and the support pile (4) close to the foundation pit (1); Second step, drill the support pile hole (2) and lower the reinforcing steel cage; Third step, drill from the inside of the foundation pit (1) to the support pile hole (2), put the fixing piece (3) after drilling, and insert the fixing piece (3) into the support pile hole (2); Fourth step, grouting is carried out outside the foundation pit (1) to form the fixed layer (5); Fifth step, pour concrete into the support pile hole (2) to form the support pile (4), the top of the support pile (4) is reserved with reinforcing steel bars, and the reinforcing steel bars are arranged in the crown beam (6) to face the crown beam (6) to pour concrete, so that the crown beam (6) and the support pile (4) are fixed.

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