Secondary loess foundation pit slope protection system

Abstract

A secondary loess foundation pit slope protection system comprises a plurality of profile steel assemblies and a plurality of steel cable assemblies, the multiple profile steel assemblies are arranged along a loess slope at equal intervals, each profile steel assembly comprises two profile steel bodies arranged side by side, and a gap is formed between the profile steel bodies; a plurality of blind holes are evenly formed in the positions, corresponding to the gaps, of the loess slope in the length direction of the profile steel body, the blind holes are obliquely formed downwards, steel cable assemblies are arranged in the blind holes in a sleeved mode, and concrete columns are poured in the blind holes to fix the steel cable assemblies. The outer end of the steel cable assembly extends out of the position between the two profile steel bodies and is fixedly supported between the outer side faces of the two profile steel bodies. According to the protection system, the steel cable assemblies are fixed through pouring of the concrete columns in the loess slope, the profile steel assemblies are tensioned and fixed through the steel cable assemblies, and by means of fusion reinforcement of the concrete columns and loess inside and transverse supporting reinforcement of the profile steel assemblies outside, the project amount can be reduced, and the loess slope reinforcement protection strength can be improved.

Description

Technical Field

[0001] The utility model relates to the field of building slope protection, in particular to a secondary loess foundation pit slope protection system. Background Art

[0002] Secondary loess mainly comes from the weathering, erosion and transportation processes of primary loess. Under specific geographical, climatic and environmental conditions, primary loess is washed, transported by water and deposited in new places to form secondary loess. Secondary loess has relatively high strength and small compressibility under natural water content conditions. However, when it encounters water, its strength will decrease, and even under its own weight, it will undergo violent and large deformations.

[0003] The characteristics of secondary loess pose a threat to the stability and safety of buildings. In engineering construction, appropriate measures should be taken to treat the secondary loess foundation pit slope to prevent the occurrence of collapse phenomena due to collapsible deformation. At present, the main treatment methods for secondary loess foundation pit protection are to increase the slope of the slope, set the slope as a broken line or leave steps, and at the same time drive cement piles into the slope for reinforcement. This treatment method will increase the earthwork volume and construction procedures of excavation, which is not conducive to cost control and construction progress assurance, and the reinforcement effect on loess is limited. It is prone to collapse phenomena in case of continuous rainy weather. Content of the Utility Model

[0004] In order to solve the above problems, the utility model provides a secondary loess foundation pit slope protection system.

[0005] The technical solution of the utility model is: a secondary loess foundation pit slope protection system, which includes a plurality of profiled steel components and a plurality of steel cable components. A plurality of profiled steel components are arranged at equal intervals along the loess slope, and the distance between adjacent profiled steel components is the same. Each profiled steel component includes two profiled steel bodies arranged side by side, and there is a gap between the profiled steel bodies. The steel cable component can pass through this gap. A plurality of blind holes are evenly arranged along the length direction of the profiled steel body at the position corresponding to this gap on the loess slope. The blind holes are arranged obliquely downward. A steel cable component is sleeved in the blind hole. The length of the steel cable component matches the depth of the blind hole, and a concrete column is poured in the blind hole to fix the steel cable component. The concrete column is integrated with the loess part. The outer end of the steel cable component extends out from between the two profiled steel bodies and is fixedly supported between the outer sides of the two profiled steel bodies.

[0006] Preferably, the steel cable component includes an inner fixing head and an outer fixing head. A plurality of steel wire cables are evenly distributed between the inner fixing head and the outer fixing head. An anti-corrosion coating is provided on the surface of the steel wire cables. The outer fixing head is supported between the outer sides of the two profiled steel bodies.

[0007] Preferably, a right-angled triangular seat is provided between the outer sides of the two steel bodies. The length of the right-angled triangular seat is greater than the width dimension between the two steel bodies. A through hole is provided in the middle of the right-angled triangular seat, and the steel wire cable can pass through the through hole smoothly. The outer fixing head is supported on the inclined side of the right-angled triangular seat.

[0008] Preferably, a connecting plate is provided between the inner fixing head and the outer fixing head. Both the inner fixing head and the outer fixing head are cylindrical heads. A first-level steel wire cable group is provided between the connecting plate and the inner fixing head, and a second-level steel wire cable group is provided between the connecting plate and the outer fixing head. The length of the second-level steel wire cable group is greater than the length of the first-level steel wire cable group, and the number of steel wire cables in the first-level steel wire cable group is less than the number of steel wire cables in the second-level steel wire cable group.

[0009] Preferably, spiral springs are fixedly sleeved on both the inner end and the outer end of the steel cable assembly, and a steel bar cage structure is formed between the spiral springs and the steel wire cable.

[0010] Preferably, a concrete seat is cast between the outer ends of the steel section assembly and the steel cable assembly.

[0011] Preferably, the cross-section of the concrete seat is an isosceles trapezoid, and the large-size bottom surface of the concrete seat is in contact with the loess slope.

[0012] Preferably, a plurality of reinforcing plates are evenly provided between the outer sides of the two steel bodies in the steel section assembly, and the reinforcing plates are welded and fixed between the two steel bodies.

[0013] Preferably, a concrete layer is sprayed on the surface of the loess slope. The concrete seat is integrated with the concrete layer, and the steel section assembly is supported on the concrete layer.

[0014] The beneficial technical effects of the present utility model are as follows:

[0015] (1) In the present utility model, the steel cable assembly is fixed by pouring concrete columns in the loess slope, and the steel section assembly is tightened and fixed by the steel cable assembly. Relying on the integration and reinforcement of the concrete columns with the loess inside and the cross-bracing reinforcement of the steel section assembly outside, it is beneficial to reduce the project quantity and improve the reinforcement and protection strength of the loess slope.

[0016] (2) The spiral springs at both ends of the steel cable assembly in the present utility model can form a steel bar cage structure with the steel cable itself, improving the pouring and fixing strength of both ends of the steel cable assembly in the concrete column, thereby ensuring the tightening strength of the steel section assembly and avoiding loosening and slipping phenomena, and ensuring the protection stability. Description of the Drawings

[0017] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0018] Figure 2 is Figure 1Schematic cross-sectional structure diagram taken along the A-A direction;

[0019] Figure 3 is Figure 2 Partial enlarged view;

[0020] Figure 4 is Figure 2 Schematic structure diagram after setting the concrete base and concrete layer in;

[0021] Figure 5 Schematic three-dimensional structure diagram of the cable assembly;

[0022] Figure 6 is Figure 5 Schematic cross-sectional structure diagram taken along the B-B direction of;

[0023] Figure 7 is Figure 5 Schematic cross-sectional structure diagram taken along the C-C direction of;

[0024] Figure 8 It is the construction use diagram of the present utility model.

[0025] In the figure, 01. Section steel assembly, 11. Section steel body, 12. Gap, 13. Reinforcement plate, 14. Right-angled triangular seat, 141. Through hole, 02. Cable assembly, 21. Inner fixing head, 22. Outer fixing head, 23. Steel wire cable, 24. Connecting plate, 251. First-level steel wire cable group, 252. Second-level steel wire cable group, 26. Helical spring, 03. Loess slope, 31. Blind hole, 32. Concrete column, 33. Concrete base, 34. Concrete layer. Specific implementation mode

[0026] Example 1, see the attached drawings of the specification Figure 1, A secondary loess foundation pit slope protection system, comprising a number of steel component assemblies 01 and a number of steel cable component assemblies 02. A number of steel component assemblies 01 are equidistantly arranged along the loess slope 03. The steel component assembly includes two steel bodies 11 arranged side by side. The steel body is an I-beam with a certain length. There is a gap 12 between the steel bodies 11. A number of blind holes 31 are evenly arranged along the length direction of the steel body 11 at the position corresponding to the gap 12 on the loess slope 03. The outer port of the blind hole corresponds to the position of the gap 12. The blind hole 31 is arranged obliquely downward. A steel cable component assembly 02 is sleeved in the blind hole, and a concrete column 32 is poured in the blind hole 31 to fix the steel cable component assembly 02. The concrete column 32 also forms an inclined state along with the blind hole 31, so that the steel cable component assembly 02 can tighten the steel component assembly 01 in an inclined posture, and the effect of limiting and tightening is better, and it is not easy to loosen. The outer end of the steel cable component assembly 02 extends out between the two steel bodies 11 and is fixedly supported between the outer sides of the two steel bodies 11. A number of reinforcement plates 13 are evenly arranged between the outer sides of the two steel bodies 11 in the steel component assembly 01. This protection system fixes the steel cable component assembly 02 by pouring the concrete column 32 in the loess slope 03, tightens and fixes the steel component assembly 01 through the steel cable component assembly, and relies on the integration and reinforcement of the concrete column 32 itself with the loess inside and the cross-bracing reinforcement of the steel component assembly outside to form a double support and reinforcement system, improving the reinforcement and protection strength of the loess slope 03.

[0027] Example 2, see the attached drawings in the specification Figures 2 - 3 、5 - 7. On the basis of Example 1, this embodiment designs the steel cable component assembly 02 to include an inner fixing head 21 and an outer fixing head 22. Both the inner fixing head and the outer fixing head are cylindrical heads. A number of steel wire cables 23 are evenly distributed between the inner fixing head and the outer fixing head. The outer fixing head 22 is supported between the outer sides of the two steel bodies 11. The size of the outer fixing head 22 is larger than the size of the gap 12 between the two steel bodies 11. The pulling stability of the multiple steel wire cables 23 is good, and they can be more firmly poured and fixed in the concrete column 32.

[0028] A right-angled triangular seat 14 is arranged between the outer sides of the two steel bodies 11. A through hole 141 is provided in the middle of the right-angled triangular seat 14. The steel wire cable 23 passes through the through hole 141. The outer fixing head 22 is supported on the inclined side of the right-angled triangular seat 14. Through this right-angled triangular seat, the limiting support strength of the outer fixing head 22 at the outer end of the steel wire cable 23 between the two steel bodies 11 is improved. At the same time, the blind hole 31 is designed as an inclined hole, and the inclination angle of the inclined hole is the same as the inclination angle of the inclined side of the right-angled triangular seat 14, so that the steel cable can pull the steel body 11 in an inclined straight line state.

[0029] A connecting plate 24 is provided between the internal fixing head 21 and the external fixing head 22. A first wire rope group 251 is provided between the connecting plate and the internal fixing head 21, and a second wire rope group 252 is provided between the connecting plate 24 and the external fixing head 22. The number of wire ropes 23 in the first wire rope group 251 is less than the number of wire ropes 23 in the second wire rope group. The tensile force received by the cable assembly 02 at the inner end of the concrete column 32 is small, and the tensile force received near the outer end of the profiled steel body 11 is large. Therefore, the cable assembly 02 is designed as a two-stage structure. The number of wire ropes 23 in the first wire rope group 251 is small and can cope with a small tensile force. The number of wire ropes in the second wire rope group 252 is large to cope with a large tensile force. The structural design is more reasonable and is conducive to cost reduction.

[0030] Spiral springs 26 are fixedly sleeved at both the inner end and the outer end of the cable assembly 02. The spiral springs 26 can form a steel reinforcement cage structure with the steel cables themselves, improving the pouring and fixing strength of both ends of the cable assembly 02 in the concrete column 32, ensuring the tensioning strength of the profiled steel assembly 01, avoiding loosening and slipping phenomena, and improving the protection stability.

[0031] Embodiment 3, see the attached Figure 4 In this embodiment, on the basis of Embodiment 1, a concrete seat 33 is poured between the outer ends of the profiled steel assembly 01 and the cable assembly 02. The outer ends of the profiled steel assembly 01 and the cable assembly 02 are fixed and sealed through the concrete seat 33, further improving the protection strength and being able to prevent the outer ends of the profiled steel assembly 01 and the cable assembly 02 from being severely corroded, ensuring the stability of tensioning and limiting.

[0032] The cross-section of the concrete seat 33 is an isosceles trapezoid with high stability. At the same time, a concrete layer 34 is sprayed on the surface of the loess slope 03. The profiled steel assembly 01 is supported on the concrete layer 34. The concrete layer 34 forms a solidified layer on the slope of the loess, which can prevent rainwater from scouring and eroding.

Claims

1. A secondary loess foundation pit slope protection system, characterized in that: It includes a number of profiled steel components and a number of cable components. A number of profiled steel components are equidistantly arranged along the loess slope. The profiled steel component includes two profiled steel bodies arranged side by side, with a gap between the profiled steel bodies. A number of blind holes are evenly arranged along the length direction of the profiled steel bodies at the position corresponding to the gap on the loess slope. The blind holes are arranged obliquely downward. A cable component is sleeved in the blind hole, and a concrete column is poured in the blind hole to fix the cable component. The outer end of the cable component extends out between the two profiled steel bodies and is fixedly supported between the outer sides of the two profiled steel bodies.

2. The secondary loess foundation pit slope protection system according to claim 1, wherein: The cable component includes an inner fixing head and an outer fixing head. A number of steel wire cables are evenly distributed between the inner fixing head and the outer fixing head. The outer fixing head is supported between the outer sides of the two profiled steel bodies.

3. The secondary loess foundation pit slope protection system according to claim 2, characterized in that: A right-angled triangular seat is arranged between the outer sides of the two profiled steel bodies. A through hole is arranged in the middle of the right-angled triangular seat. The steel wire cable passes through the through hole. The outer fixing head is supported on the inclined side of the right-angled triangular seat.

4. A secondary loess foundation pit slope protection system according to claim 2, characterized in that: A connecting plate is arranged between the inner fixing head and the outer fixing head. A first-level steel wire cable group is arranged between the connecting plate and the inner fixing head, and a second-level steel wire cable group is arranged between the connecting plate and the outer fixing head. The number of steel wire cables in the first-level steel wire cable group is less than the number of steel wire cables in the second-level steel wire cable group.

5. A secondary loess foundation pit slope protection system according to claim 1, characterized in that: Spiral springs are fixedly sleeved at both the inner end and the outer end of the cable component.

6. The secondary loess foundation pit slope protection system according to claim 1, characterized in that: A concrete seat is poured between the outer ends of the profiled steel component and the cable component.

7. A secondary loess foundation pit slope protection system according to claim 6, characterized in that: The cross section of the concrete seat is an isosceles trapezoid.

8. A secondary loess foundation pit slope protection system according to claim 1, characterized in that: The surface of the loess slope is sprayed with a concrete layer, and the profiled steel component is supported on the concrete layer.

9. The secondary loess foundation pit slope protection system according to claim 1, characterized in that: A number of reinforcing plates are evenly arranged between the outer sides of the two profiled steel bodies in the profiled steel component.

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