Steel reinforced concrete waist beam, deep foundation pit supporting structure and manufacturing method of waist beam

Abstract

The invention discloses a steel reinforced concrete waist beam, a deep foundation pit supporting structure and a manufacturing method of the waist beam, and belongs to the technical field of deep foundation pit supporting structures. The steel reinforced concrete waist beam comprises profile steel and concrete, and the profile steel is provided with a plurality of reinforcing areas; the multiple reinforcing areas are arranged at intervals in the length direction of the waist beam. The concrete is arranged in the reinforcing area. The reinforcing areas are arranged at intervals in the length direction of the waist beam, and the shear strength of the reinforcing areas is improved by pouring concrete in the reinforcing areas; by pouring concrete on the profile steel, local buckling of the profile steel can be restrained, and the ductility and energy dissipation capacity of the waist beam are improved; the concrete is arranged in the reinforcing area, the shear strength of the reinforcing area can be intensively reinforced through a simple structure, stress deformation of the waist beam is avoided, and the machining cost is low.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of deep foundation pit supporting structure, and particularly relates to a type steel concrete waist beam, a deep foundation pit supporting structure and a waist beam manufacturing method. BACKGROUND

[0002] The waist beam is a ring beam or a local beam arranged horizontally inside or outside the supporting pile. The waist beam disperses the lateral earth pressure borne by the supporting pile to the horizontal support to avoid local stress concentration.

[0003] A Chinese patent with the publication number CN115110542A discloses a wedge-shaped concrete waist beam construction method, which comprises the following steps: after the anchor rod (steel wire bundle) is constructed, the soil between the cast-in-place supporting piles or the prefabricated supporting piles is cleaned to form a 1 / 4 wedge shape of the pile diameter, which should not exceed 1 / 2 of the pile diameter, a concrete support base mold and an outer mold are performed, an anchor rod steel wire bundle sleeve pipe is pre-buried, and an end plate and a reinforcing steel bar on the end plate are placed.

[0004] However, the concrete waist beam of the above-mentioned patent scheme needs to wait for a certain time after construction until the concrete solidifies before excavating the foundation pit soil. Compared with the concrete waist beam, the type steel can be directly used as the waist beam, but the shear strength of the type steel section is generally smaller than that of the reinforced concrete section, and the shear strength is insufficient. SUMMARY

[0005] The present application aims to provide a type steel concrete waist beam, which improves the shear strength of the reinforced area by pouring concrete in the reinforced area.

[0006] The present application also provides a deep foundation pit supporting structure.

[0007] The present application also provides a waist beam manufacturing method.

[0008] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0009] The type steel concrete waist beam provided by the first aspect of the embodiment of the present application comprises:

[0010] The type steel has a plurality of reinforced areas; the plurality of reinforced areas are arranged at intervals along the length direction of the waist beam;

[0011] The concrete is arranged in the reinforced areas.

[0012] According to the type steel concrete waist beam of the embodiment of the present application, the type steel comprises a web plate and two wing plates, the web plate connects the two wing plates, a pouring groove is formed between the web plate and the wing plates, the pouring groove is arranged along the length direction of the waist beam, and the concrete is located in the pouring groove of the reinforced area.

[0013] According to the steel reinforced concrete waist beam, the pouring groove includes a first groove and a second groove, the first groove is located at one side of the web plate, and the second groove is located at the other side of the web plate; the first groove and the second groove in the reinforcing area are both provided with the concrete.

[0014] According to the steel reinforced concrete waist beam, the steel reinforced concrete waist beam further includes a limiting rib connected to edges of the two wing plates to limit displacement of the concrete.

[0015] According to the steel reinforced concrete waist beam, the limiting rib is provided in plurality, and at least two limiting ribs have different extending directions.

[0016] According to the steel reinforced concrete waist beam, the steel reinforced concrete waist beam further includes a reinforcing rib connected to the two wing plates, and the reinforcing rib is located inside the concrete.

[0017] The second aspect embodiment of the present application provides a deep foundation pit supporting structure, which comprises a supporting pile, an inner support and the steel reinforced concrete waist beam according to any of the first aspect embodiments.

[0018] According to the deep foundation pit supporting structure, along the length direction of the waist beam, the width of the reinforcing area is greater than the width of the inner support.

[0019] The third aspect embodiment of the present application provides a waist beam manufacturing method, which is based on the waist beam according to any of the first aspect embodiments, and the construction method comprises the following steps.

[0020] Determining a reinforcing area according to the stress condition of the waist beam;

[0021] Pouring concrete in the reinforcing area.

[0022] According to the waist beam manufacturing method, before the step of determining the reinforcing area according to the stress condition of the waist beam, the method further comprises the following steps.

[0023] Determining a strength grade of the concrete according to the stress condition of the waist beam.

[0024] The present application has at least the following beneficial effects:

[0025] The plurality of reinforcing areas are arranged along the length direction of the web beam, the shear strength of the reinforcing areas is improved by pouring concrete in the reinforcing areas, the local buckling of the profile steel is inhibited by pouring concrete on the profile steel, the ductility and energy dissipation capacity of the web beam are improved, the shear strength of the reinforcing areas is concentratedly improved by the simple structure, the stress deformation of the web beam is avoided, and the processing cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0026] The application will be further described below in combination with the drawings and examples.

[0027] Figure 1 is a schematic diagram of the overall structure of the profile steel reinforced concrete web beam provided by the embodiment of the application.

[0028] Figure 2 is a schematic diagram of the overall structure of the profile steel reinforced concrete web beam provided by the embodiment of the application.

[0029] Figure 3 is a schematic diagram of the overall structure of the profile steel reinforced concrete web beam provided by the embodiment of the application.

[0030] Figure 4 is a stress calculation model of the inner support 600 and the profile steel 100 web beam.

[0031] Figure 5 is a schematic diagram of the reinforcing area of the profile steel reinforced concrete web beam provided by the embodiment of the application.

[0032] Figure 6 is a schematic diagram of the reinforcing area of the profile steel reinforced concrete web beam provided by the embodiment of the application.

[0033] Figure 7 is a schematic diagram of the overall structure of the profile steel reinforced concrete web beam provided by the embodiment of the application.

[0034] In the drawings, the following marks are used:

[0035] 100, profile steel; 110, reinforcing area; 120, web plate; 130, wing plate; 140, pouring groove; 141, first groove; 142, second groove;

[0036] 200, concrete;

[0037] 300, limiting rib;

[0038] 400, reinforcing rib;

[0039] 500, support pile;

[0040] 600, inner support. DETAILED DESCRIPTION

[0041] The specific embodiments of the present application will be described in detail in this part, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part with figures, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0042] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0043] In the description of the present application, if there is a word such as "several" or the like, the meaning is one or more, the meaning of multiple is two and above, greater than, less than, more than and the like are not included in the number, above, below, within and the like are included in the number. If it is described as first, second, third, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0044] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0045] Reference Figures 1 to 6 , the following several embodiments of the present application are described.

[0046] As Figures 1 to 3 shown, the profile steel concrete waist beam of the embodiment of the present application comprises a profile steel 100 and a concrete 200, the profile steel 100 has a plurality of reinforcing areas 110; the plurality of reinforcing areas 110 are arranged at intervals along the length direction of the waist beam; the concrete 200 is arranged in the reinforcing area 110.

[0047] The plurality of reinforcing areas 110 are arranged at intervals along the length direction of the waist beam, the concrete 200 is poured in the reinforcing area 110 to improve the shear strength of the reinforcing area 110; the concrete 200 is poured on the profile steel 100 to suppress the local buckling of the profile steel 100 and improve the ductility and energy dissipation capacity of the waist beam; the concrete 200 is arranged in the reinforcing area 110, the shear strength of the reinforcing area 110 can be concentrated and strengthened by a simple structure, the waist beam is prevented from deforming under stress, and the processing cost is low.

[0048] The position of the waist beam bearing large shear force can be calculated according to actual construction requirements, the overall structural strength of the waist beam is improved in the case of reducing the waist beam material as much as possible; the embodiment of the present application directly pours the concrete 200 in the reinforced area 110, hoists the waist beam into the foundation pit for installation after the concrete 200 reaches a certain strength, and then constructs the inner support 600 and excavates earthwork. The prefabricated steel concrete waist beam can also be used, which is transported to the site after the concrete 200 reaches the strength, and when the earthwork is excavated to the position where the waist beam is installed, the prefabricated steel concrete waist beam is installed, and then the inner support 600 is installed, so that the earthwork can be excavated downward without waiting for the concrete 200 to age, and the construction period is not delayed.

[0049] In the related art, compared with the concrete 200 waist beam, the cross section of the steel 100 waist beam is smaller, and the shear strength is insufficient; when the axial force of the inner support 600 is large, a large shear force is borne at the connection between the support and the steel 100 waist beam; in engineering, a steel 100 with a larger cross section or a reinforced concrete 200 waist beam is generally used to avoid local fracture or bending of the waist beam during stress process.

[0050] However, the actual shear strength of the waist beam can only meet the connection between the inner support and the waist beam, that is, the L1 section in the Figure 7 The shear strength of most of the waist beam can meet the calculation requirements, if the steel 100 with a larger cross section is directly replaced or the reinforced concrete 200 waist beam is used, the engineering cost will be too high.

[0051] Figure 4 That is, the stress calculation model of the inner support 600 and the steel 100 waist beam, and from the shear calculation result in the figure, it can be seen that only the shear force at the connection between the waist beam and the support is the largest, and the shear force between the adjacent two supports is distributed in a straight line. There are still many sections of the waist beam with small shear force.

[0052] The embodiment of the present application sets the reinforcing area 110 at the maximum shear position (i.e. the connection position of the inner support and the waist beam), and pours the concrete 200 in the reinforcing area 110, so as to realize the significant improvement of the local stiffness and the bearing capacity under the premise of low cost; the multiple reinforcing areas 110 are set in the length direction of the profile steel 100, and the concrete 200 is poured, so as to realize the local reinforcement and the improvement of the overall structural performance of the waist beam without replacing the profile steel 100 with a larger section or replacing the concrete 200 waist beam, thereby enhancing the bearing capacity and the stiffness. Compared with the concrete 200 waist beam, the profile steel 100 has light weight and high bearing capacity, can reduce the structural dead weight and the foundation load; the steel has good ductility, can absorb the seismic energy through plastic deformation, avoids the sudden fracture, and improves the overall seismic capacity of the structure; the embodiment of the present application directly pours the concrete 200 in the reinforcing area 110 of the profile steel 100, the profile steel 100 is easy to obtain, and the concrete 200 can be directly poured in the reinforcing area 110 of the profile steel 100, so the processing is convenient, meanwhile, the construction period can be reduced through the prefabricated waist beam, and the maintenance is not needed, thereby shortening the construction period.

[0053] As shown in Figure 3 In some embodiments, the profile steel 100 includes the web 120 and two flanges 130, the web 120 connects the two flanges 130; the pouring groove 140 is formed between the web 120 and the flange 130, and the pouring groove 140 is arranged along the length direction of the waist beam; the flange 130 is used for resisting the bending moment, and the web 120 is used for resisting the shear force; the pouring groove 140 is formed through the web 120 and the flange 130, that is to say, the flange 130 can be formed only by the profile steel 100 itself without the additional formwork for pouring; the concrete 200 is located in the pouring groove 140 of the reinforcing area 110, the pouring groove 140 is used for bearing and containing the concrete 200, and prevents the deformation of the concrete 200; in this way, the concrete 200 can be conveniently filled in the pouring groove 140, and the pouring and forming can be realized without the additional formwork, so as to improve the structural strength of the reinforcing area 110.

[0054] As shown in Figure 3As shown in the first aspect and the second aspect, in some embodiments, the pouring groove 140 includes a first groove 141 located at one side of the web plate 120 and a second groove 142 located at the other side of the web plate 120; the first groove 141 and the second groove 142 in the reinforced area 110 are both provided with the concrete 200, which can greatly increase the cross-sectional area of the reinforced area 110, thereby improving the shear strength of the reinforced area 110; the concrete 200 on both sides clamps the web plate 120, improving the firmness of the connection between the concrete 200 and the steel 100, and reducing the risk of separation of the concrete 200 and the steel 100; the first groove 141 is located at one side of the web plate 120, and the second groove 142 is located at the other side of the web plate 120, and the concrete 200 is filled on both sides of the reinforced area 110 to form symmetrical concrete 200 pressure-bearing bodies on both sides of the web plate 120 to share the load and avoid stress concentration on one side of the web plate 120.

[0055] As shown in the first aspect and the second aspect, Figure 5 and Figure 6 As shown in the first aspect and the second aspect, in some embodiments, the steel-concrete composite waist beam further includes a limiting rib 300 connected to the edges of the two flanges 130 to limit the displacement of the concrete 200, thereby avoiding the concrete 200 from falling off during hoisting of the steel-concrete composite waist beam; the limiting rib 300 is connected to the edges of the two flanges 130 to fix the limiting rib 300 and prevent the concrete 200 from separating from the pouring groove 140; after the concrete 200 hardens, the limiting rib 300 limits the displacement of the concrete 200, thereby maximizing the compressive strength of the concrete 200 and ensuring the working integrity of the steel-concrete composite waist beam under repeated loads; the limiting rib 300 is a steel bar, and the limiting rib 300 is fixed to the edges of the flanges 130 by welding.

[0056] As shown in the first aspect and the second aspect, Figure 5 and Figure 6 As shown in the first aspect and the second aspect, in some embodiments, the limiting rib 300 is provided in multiple numbers, and at least two limiting ribs 300 have different extension directions; the limiting ribs 300 in different directions respectively inhibit the displacement of the concrete 200 in different directions; for example, the limiting rib 300 can be arranged on the top surface, the bottom surface and the side surface of the steel 100 to limit the concrete 200 from different directions, thereby avoiding the concrete 200 from falling off during hoisting of the waist beam; the limiting rib 300 includes a transverse rib and a longitudinal rib, the longitudinal rib limits the transverse sliding, and the longitudinal rib is arranged parallel to the waist beam axis, and the transverse rib blocks the sliding trend of the concrete 200 along the length direction of the steel 100, thereby limiting the displacement of the concrete 200 in the three-dimensional space; in this embodiment, two transverse ribs are arranged at the two ends of the steel 100, and two longitudinal ribs are arranged on the upper and lower sides of the steel 100; wherein the number of the steel 100 can be arranged according to actual needs, and the embodiments of the present application do not particularly limit this.

[0057] As shown in the first aspect and the second aspect, Figure 5 andFigure 6 As shown, in some embodiments, the steel reinforced concrete waist beam further comprises a reinforcing bar 400, the reinforcing bar 400 is connected to the two wing plates 130, and the reinforcing bar 400 is located inside the concrete 200, so that the reinforcing bar 400 is embedded inside the concrete 200, the reinforcing bar can limit the expansion of the crack of the concrete 200, reduce the crack width, delay the invasion of moisture and corrosive medium, and enhance the crack resistance and integrity of the concrete 200 itself; the reinforcing bar 400 is a steel bar, the steel bar and the concrete 200 bear force together, the compressive resistance of the concrete 200 and the tensile resistance of the steel bar are fully utilized, and the load bearing capacity of the component is doubled; the reinforcing bar 400 is connected to the two wing plates 130, which can improve the overall structural strength of the steel 100, and inhibit the outward deformation of the wing plate 130 when the concrete 200 is under compression. At the same time, the reinforcing bar 400 can further prevent the concrete 200 from sliding in the pouring groove 140; in the embodiment of the application, two reinforcing bars 400 are arranged in the first groove 141, and two reinforcing bars 400 are arranged in the second groove 142; the reinforcing bar 400 can be arranged parallel to the axis direction of the steel 100, or can be arranged perpendicular to the length direction of the steel 100; in addition, a shear reinforcing bar can be arranged in the length direction of the steel 100 to improve the tensile force and bending tensile stress of the waist beam in the length direction.

[0058] The second aspect of the embodiment of the application provides a deep foundation pit support structure, which comprises a support pile 500, an inner support 600 and the steel reinforced concrete waist beam of any one of the first aspect embodiments. Figures 1 to 6 As shown, the inner support 600 is provided in plurality and is arranged at intervals; the waist beam is arranged on the inner side of the support pile 500 and on the inner support 600.

[0059] It can be understood that the steel reinforced concrete waist beam has the beneficial effects of the above-mentioned embodiments, and the deep foundation pit support structure accordingly has the beneficial effects of the above-mentioned embodiments, and the specific implementation manner can refer to the above-mentioned embodiments, which will not be described herein again.

[0060] After the deep foundation pit is excavated, the lateral pressure of the soil body increases, the inner support 600 resists the lateral deformation of the support pile 500 in a manner of axial compression, and prevents the collapse of the foundation pit. The plurality of inner supports 600 are arranged at intervals, which reduces the bending moment and shear force of the support pile 500, and avoids excessive deformation to cause the surrounding ground surface to sink or the building to crack. The waist beam integrates the discrete support pile 500 reaction force into a continuous distributed force flow, forms a cooperative force system, reduces local deformation, and the waist beam shares part of the earth pressure, thereby reducing the bending moment of the cantilever section of the support pile. The waist beam is arranged on the plurality of inner supports 600 to uniformly transmit the support axial force to the support pile and avoid stress concentration. The embodiment of the application improves the shear strength of the waist beam by reinforcing the concrete 200 of the reinforcing area 110.

[0061] As shown in Figure 1As shown, in some embodiments, along the length direction of the purlin, the width of the reinforcing area 110 is greater than the width of the inner support 600, so as to ensure the stiffness of the purlin and avoid deformation of the purlin due to force.

[0062] The third aspect of the present application provides a manufacturing method of a purlin, based on the purlin of any of the embodiments of the first aspect, the construction method comprising:

[0063] determining the reinforcing area 110 according to the stress condition of the purlin;

[0064] pouring concrete 200 in the reinforcing area 110.

[0065] Based on the stress condition of the purlin, the position of the reinforcing area 110 is determined, so as to strengthen the shear resistance of the purlin by pouring concrete 200 in a targeted and local manner, thereby achieving the improvement of the overall stiffness at a low cost, and avoiding the fracture or bending of the purlin during the stress process; pouring concrete 200 in the reinforcing area 110 ensures that the concrete 200 and the profile steel 100 are tightly engaged, and the reinforcing area 110 is formed by pouring concrete 200 in a targeted manner, so as to form a solid reinforcing node, and the concrete 200 and the profile steel 100 are used for on-demand reinforcement in a case of as little material as possible, so that the purlin obtains the optimal stiffness and weight ratio at the minimum material cost.

[0066] The profile steel 100 with a relatively small cross section cannot meet the shear calculation requirement, and the embodiment of the present application only needs to strengthen the profile steel 100 purlin by pouring concrete 200 in the reinforcing area 110 of the purlin, and the other parts do not need to be processed. There is no need to replace the profile steel 100 with a larger cross section or replace it with a reinforced concrete 200 purlin.

[0067] According to the stress condition of the purlin, the reinforcing area 110 is determined, specifically, first, the section L1 in which the shear strength of the profile steel 100 with a small cross section cannot meet the requirement is obtained according to the design calculation result, and then the concrete 200 is poured in the first groove 141 and the second groove 142 of the L1 section.

[0068] In some embodiments, before determining the reinforcing area 110 according to the stress condition of the purlin, the method further comprises:

[0069] determining the strength grade of the concrete 200 according to the stress condition of the purlin.

[0070] Based on the stress condition of the purlin in different scenarios, different strength grades of the concrete 200 can be selected; for example, in a high shear scenario, high-strength concrete 200 (such as C50 grade) is used to improve the shear capacity of the purlin and prevent the purlin from being crushed under shear stress, so that the purlin as a whole obtains the optimal strength and cost ratio.

[0071] According to the calculation result of the stress condition, the section L1 which cannot satisfy the shear strength is determined, and then the strength grade of the concrete 200 which needs to be poured in the pouring groove 140 is calculated; in order to improve the shear strength, the reinforcing steel bars can be placed in the first groove 141 and the second groove 142 of the section L1, and then the concrete 200 is poured, and then the waist beam is installed according to the normal process.

[0072] The above describes the preferred embodiments of the present application, but the present application is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A steel-concrete waist beam, characterized in that: include: The steel section (100) has a plurality of reinforcement areas (110); the plurality of reinforcement areas (110) are spaced apart along the length direction of the waist beam; Concrete (200) is provided in the reinforcement area (110).

2. The steel-concrete waist beam according to claim 1, characterized in that: The steel section (100) comprises a web (120) and two wing plates (130), wherein the web (120) connects the two wing plates (130); a casting trough (140) is formed between the web (120) and the wing plates (130), and the casting trough (140) extends along the length direction of the waist beam; and the concrete (200) is located in the casting trough (140) of the reinforced area (110).

3. The steel-concrete waist beam according to claim 2, characterized in that: The casting trough (140) includes a first trough (141) and a second trough (142), wherein the first trough (141) is located on one side of the web (120), and the second trough (142) is located on the other side of the web (120); the first trough (141) and the second trough (142) in the reinforced area (110) are both provided with the concrete (200).

4. The steel-concrete waist beam according to claim 2, characterized in that: The steel-concrete waist beam further comprises limiting ribs (300), which are connected to the edges of the two wing plates (130) to limit the displacement of the concrete (200).

5. The steel-concrete waist beam according to claim 4, characterized in that: A plurality of the limiting ribs (300) are provided, and at least two of the limiting ribs (300) extend in different directions.

6. The steel-concrete waist beam according to claim 2, characterized in that: The steel-concrete waist beam further comprises reinforcing ribs (400), the reinforcing ribs (400) being connected to the two wing plates (130), and the reinforcing ribs (400) being located inside the concrete (200).

7. A deep foundation pit support structure, characterized in that: The invention comprises a supporting pile (500), an inner support (600) and a steel-concrete waist beam according to any one of claims 1 to 6; a plurality of inner supports (600) are provided, and the plurality of inner supports (600) are arranged at intervals; the waist beam is arranged on the inner side of the supporting pile (500) and is located on the inner support (600).

8. The deep foundation pit supporting structure according to claim 7, characterized in that: Along the length direction of the waist beam, the width of the reinforcement area (110) is greater than the width of the inner support (600).

9. A method for manufacturing a waist beam, characterized in that: Based on the waist beam according to any one of claims 1 to 6, the construction method comprises: Determine the reinforcement area (110) according to the stress condition of the waist beam; Concrete (200) is poured in the reinforcement area (110).

10. The method for manufacturing a waist beam according to claim 9, characterized in that: Before determining the reinforcement area (110) according to the stress condition of the waist beam, the method further includes: The strength grade of the concrete (200) is determined according to the stress condition of the waist beam.

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