Prestressed profile steel supporting structure for deep foundation pit

Abstract

The utility model relates to the technical field of deep foundation pit supporting, in particular to a deep foundation pit prestressed profile steel supporting structure which comprises an enclosure wall, the enclosure wall is arranged along the periphery of the inner wall of a foundation pit, each side wall of the enclosure wall is fixedly connected with an enclosure purlin, and an angle supporting rod is fixedly connected between every two adjacent enclosure purlins. According to the utility model, the pushing device can be used for stretching in the axial direction, and when the output shaft of the pushing device pushes the angle supporting rod or the transverse supporting rod to stretch outwards and reach a design value, the force retaining box is connected between the two groups of profile steel bars forming the angle supporting rod or the transverse supporting rod by using the high-strength bolts; and the angle supporting rods and the transverse supporting rods can be kept fixed after extending to the designed length, so that it is guaranteed that the angle supporting rods and the transverse supporting rods can stably generate outward pushing prestress on the enclosing purlins for a long time, and the situation that a foundation pit collapses inwards due to the fact that the enclosure wall deforms under the large extrusion effect of surrounding soil is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to deep foundation pit support technical field, specifically, relate to a deep foundation pit prestressed steel support structure. BACKGROUND

[0002] Deep foundation pit support refers to the safety of underground structure construction and the surrounding environment of foundation pit, the support, reinforcement and protection measures used to the side wall and surrounding environment of deep foundation pit.

[0003] The existing deep foundation pit support usually lacks the prestress effect of outward jacking of the enclosure wall around the foundation pit, when the soil pressure around the foundation pit is large, the enclosure wall of the foundation pit may deform inward under the extrusion of the soil, and then easily cause the collapse of the soil around the foundation pit. UTILITY MODEL CONTENT

[0004] The utility model provides a deep foundation pit prestressed steel support structure, solve the technical problem of lacking the prestress effect of outward jacking of the enclosure wall around the foundation pit in prior art, cause the enclosure wall of the foundation pit to deform inward under the extrusion of the soil.

[0005] In view of the above problem, the technical scheme provided by the utility model is:

[0006] A deep foundation pit prestressed steel support structure, including the enclosure wall, the enclosure wall is along the inner wall periphery of foundation pit and is arranged, each side wall of the enclosure wall is fixedly connected with the surrounding purlin, two groups of adjacent surrounding purlin are provided with the angle support rod and are fixedly connected, the support structure still includes the cross support, the cross support is fixedly connected between two groups of surrounding purlin, the angle support rod and the cross support are all constituted by two groups of opposite steel strips, and the top pushing device is arranged between the two groups of steel strips constituting the angle support rod and the cross support, the angle support rod and the cross support are still provided with the force preservation box, and the both ends of the force preservation box are fixedly connected between the two groups of steel strips by high-strength bolts.

[0007] Further, the support structure further includes a plurality of groups of vertical columns arranged inside the foundation pit, the vertical columns are distributed on both sides of the angle support rod and the cross support, and the vertical columns are provided with triangular supports.

[0008] Further, the angle support rod and the cross support are all I-shaped steel structures, the middle of the web plate of the angle support rod and the cross support is provided with a reinforcing plate, and a plurality of groups of reinforcing strips are fixedly connected to the flange plate of the angle support rod and the cross support.

[0009] Further, the surface of the surrounding purlin, the angle support rod and the cross support is provided with a corrosion-resistant coating.

[0010] Further, the end of the horizontal support rod is provided with two groups of inclined braces, the ends of the inclined braces are fixedly connected on the surrounding purlin.

[0011] Further, the enclosure wall is composed of several groups of opposite steel sheet piles connected, the cross section of the steel sheet pile is a Chinese character-shaped structure, the two sides of the steel sheet pile are provided with water locking clamping strips, the water locking clamping strips between the two adjacent groups of steel sheet piles are buckled with each other.

[0012] Compared with the prior art, the beneficial effects of the utility model are that: the pushing device can stretch or stretch towards the axial direction, when the output shaft of the pushing device pushes the angle support rod or the horizontal support rod to stretch outwards and reach the design value, the force maintaining box is connected between the two groups of steel strips constituting the angle support rod or the horizontal support rod by using the high-strength bolt, so that the angle support rod and the horizontal support rod can be fixed after stretching to the design length, so that the angle support rod and the horizontal support rod can generate the prestress to push the surrounding purlin outwards for a long time, and the deformation of the enclosure wall under the extrusion of the surrounding soil is avoided, so that the inward collapse of the foundation pit is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as limiting the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a top view structural schematic diagram of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the angle support rod and the horizontal support rod in the utility model;

[0017] Figure 4 It is a structural schematic diagram of the steel strip and the pushing device in the utility model;

[0018] Figure 5 It is a structural schematic diagram of the stand column and the triangular support in the utility model;

[0019] Figure 6 It is a split structural schematic diagram of the steel sheet pile in the utility model.

[0020] In the figure: 1, enclosure wall; 2, enclosure purlin; 3, corner support rod; 4, horizontal support rod; 5, profiled steel strip; 6, pushing device; 7, force maintaining box; 8, stand column; 9, triangular support; 10, reinforced plate; 11, reinforcing strip; 12, diagonal brace; 13, steel sheet pile; 14, water locking clamping strip. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. 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.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. 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.

[0023] Please refer to Figures 1-6 A deep foundation pit prestressed profiled steel support structure, comprising an enclosure wall 1, the enclosure wall 1 is arranged along the inner wall periphery of the foundation pit, and the foundation pit is surrounded from the inside, and a fixed connection is arranged on each side wall of the enclosure wall 1, two groups of adjacent enclosure purlins 2 are arranged and fixedly connected with corner support rods 3, the corner support rods 3 can be supported between the two groups of adjacent enclosure purlins 2, so as to connect the two groups of enclosure purlins 2 together to form an overall structure, displacement between the adjacent enclosure purlins 2 is avoided, and a supporting effect is formed on the corner positions of the enclosure wall 1, the support structure further comprises horizontal support rods 4, the horizontal support rods 4 are fixedly connected between the two groups of opposite enclosure purlins 2, and a horizontal supporting effect is formed between the opposite enclosure purlins 2 in the foundation pit, a horizontal supporting force is formed on the side wall of the foundation pit from the inside, the corner support rods 3 and the horizontal support rods 4 are both composed of two groups of profiled steel strips 5, a pushing device 6 is arranged between the two groups of profiled steel strips 5 constituting the corner support rods 3 and the horizontal support rods 4, the pushing device 6 adopts a common hydraulic cylinder on the market, when the output shaft of the pushing device 6 is elongated, a relative pushing force can be formed on the two groups of profiled steel strips 5 constituting the corner support rods 3 and the horizontal support rods 4, so that the horizontal support rods 4 or the profiled steel strips 5 can be stretched along the axial direction, and force maintaining boxes 7 are further arranged on the corner support rods 3 and the horizontal support rods 4, and the two ends of the force maintaining boxes 7 are fixedly connected between the two groups of profiled steel strips 5 by high-strength bolts.

[0024] By starting the jacking device 6 on the purlin 2 and the cross support rod 4, the cross support rod 4 and the steel bar 5 are stretched along the axial direction. In this process, the cross support rod 4 can generate prestressing force between the two adjacent groups of purlins 2 to push toward the outside of the foundation pit, and the steel bar 5 can generate prestressing force between the two opposite groups of purlins 2 to push toward the outside of the foundation pit. When the soil around the wall 1 produces an inward squeezing effect on the retaining wall 1, the prestressing force on the purlin 2 can effectively offset the inward squeezing effect of the soil on the retaining wall 1, thereby preventing the retaining wall 1 from deforming under the greater squeezing effect of the surrounding soil and causing the foundation pit to collapse inward. The support effect on the foundation pit is ensured. When the output shaft of the jacking device 6 pushes the angle support rod 3 or the cross support rod 4 to extend outward and reaches the design value, the force box 7 is connected between the two groups of steel bars 5 constituting the angle support rod 3 or the cross support rod 4 by using high-strength bolts. The angle support rod 3 and the cross support rod 4 can remain fixed after being extended to the design length, thereby ensuring that the angle support rod 3 and the cross support rod 4 can generate prestressed force to push the purlin 2 outward for a long time and stably, avoiding the retaining wall 1 being subjected to a large extrusion pressure from the soil, which causes the jacking device 6 to retract under the action of a large external force, thereby further ensuring the support effect on the foundation pit.

[0025] For further information, see Figure 1 and Figure 3 The supporting structure also includes several groups of columns 8 vertically arranged inside the foundation pit. The columns 8 are distributed on both sides of the angle support rods 3 and the transverse support rods 4. Triangular brackets 9 are provided on the columns 8 to support the diagonal support rods 3 and the transverse support rods 4. During the installation process, the triangular brackets 9 can position the diagonal support rods 3 and the transverse support rods 4. When the angle support rods 3 and the transverse support rods 4 are directly erected on the triangular brackets 9 with lifting equipment, temporary support can be provided for the diagonal support rods 3 and the transverse support rods 4, so that they can be kept horizontally inside the foundation pit, thereby facilitating the installation of the diagonal support rods 3 and the transverse support rods 4. In addition, after the angle support rods 3 or the transverse support rods 4 are installed, the columns 8 can provide vertical support force for the diagonal support rods 3 and the transverse support rods 4, which can avoid downward bending deformation when the angle support rods 3 or the transverse support rods 4 are long.

[0026] For further information, see Figures 1-6 The angle support rods 3 and the cross support rods 4 are both I-shaped steel structures. A reinforcement plate 10 is arranged in the middle of the webs of the angle support rods 3 and the cross support rods 4. Several groups of reinforcement strips 11 are fixedly connected to the wing plates of the angle support rods 3 and the cross support rods 4. The reinforcement plates 10 and the reinforcement strips 11 can strengthen the overall strength of the angle support rods 3 and the cross support rods 4, and avoid deformation of the webs and wing plates of the angle support rods 3 and the cross support rods 4.

[0027] Furthermore, the surfaces of the surrounding purlin 2, the corner support rods 3 and the transverse support rods 4 are provided with an anti-corrosion coating to prevent the surrounding purlin 2, the corner support rods 3 or the transverse support rods 4 from rusting, thereby ensuring their service life.

[0028] Further, referring to Figures 1-6 The end of the cross support 4 is provided with two groups of inclined braces 12, the end of the inclined brace 12 is fixedly connected on the enclosing purlin 2, since the cross support 4 and the enclosing purlin 2 are perpendicular to each other, the triangle structure is formed between the connecting part of the enclosing purlin 2 and the cross support 4 through the inclined brace 12, thereby the lateral reinforcing support is formed on the connecting part, the deformation of the connecting part of the cross support 4 and the enclosing purlin 2 is avoided, and the stability of the connection between the enclosing purlin 2 and the cross support 4 is ensured.

[0029] Further, referring to Figures 1-6 The enclosure wall 1 is formed by a plurality of groups of steel sheet piles 13 connected in opposite directions, the cross section of the steel sheet pile 13 is a few Chinese character-shaped structure, the two sides of the steel sheet pile 13 are provided with water locking strips 14, the water locking strips 14 between the two adjacent groups of steel sheet piles 13 are buckled with each other, the water locking strips 14 buckled together can enhance the sealing between the two groups of steel sheet piles 13, and the water in the soil around the foundation pit is prevented from penetrating into the foundation pit through the gap around the steel sheet pile 13.

[0030] The above only is the preferred embodiment of the utility model, and does not limit the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A prestressed steel support structure for a deep foundation pit, comprising a retaining wall (1), wherein the retaining wall (1) is arranged along the periphery of the inner wall of the foundation pit, and a purlin (2) is fixedly connected to each side wall of the retaining wall (1), characterized in that: An angle support rod (3) is fixedly connected between two groups of adjacent purlins (2). The support structure also includes a transverse support rod (4). The transverse support rod (4) is fixedly connected between the two opposite groups of purlins (2). The angle support rod (3) and the transverse support rod (4) are both composed of two groups of opposite steel bars (5). A pushing device (6) is provided between the two groups of steel bars (5) constituting the angle support rod (3) and the transverse support rod (4). A force box (7) is also provided on the angle support rod (3) and the transverse support rod (4). Both ends of the force box (7) are fixedly connected between the two groups of steel bars (5) by high-strength bolts.

2. The deep foundation pit prestressed steel support structure according to claim 1 is characterized in that: The support structure further comprises a plurality of groups of columns (8) vertically arranged inside the foundation pit, wherein the columns (8) are distributed on both sides of the corner support rods (3) and the transverse support rods (4), and triangular brackets (9) are arranged on the columns (8).

3. The deep foundation pit prestressed steel support structure according to claim 1 is characterized in that: The angle support rod (3) and the transverse support rod (4) are both I-shaped steel structures, a reinforcement plate (10) is provided in the middle of the web of the angle support rod (3) and the transverse support rod (4), and a plurality of groups of reinforcement strips (11) are fixedly connected to the wing plates of the angle support rod (3) and the transverse support rod (4).

4. The deep foundation pit prestressed steel support structure according to claim 1 is characterized in that: The surfaces of the surrounding purlins (2), the corner support rods (3) and the transverse support rods (4) are provided with an anti-corrosion coating.

5. The deep foundation pit prestressed steel supporting structure according to claim 1 is characterized in that: Two groups of diagonal braces (12) are provided at the ends of the transverse support rod (4), and the ends of the diagonal braces (12) are fixedly connected to the surrounding purlin (2).

6. The deep foundation pit prestressed steel support structure according to claim 1, characterized in that: The retaining wall (1) is formed by connecting a plurality of groups of steel sheet piles (13) facing in opposite directions. The cross section of the steel sheet piles (13) is an "X"-shaped structure. Water-locking strips (14) are provided on both sides of the steel sheet piles (13). The water-locking strips (14) between two adjacent groups of the steel sheet piles (13) are interlocked.

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