Cross-shaped steel support system for foundation pit

Abstract

The present invention discloses a cross-shaped steel support system for foundation pits, aiming to provide a cross-shaped steel support system for foundation pits that can not only make the steel support beams distributed in a cross shape at the same elevation, but also effectively improve the stability of the cross-shaped conversion component and avoid the problem of shear failure of the cross-shaped conversion component serving as a node. It includes: a cross-shaped conversion component, which includes four outer connecting beams. The four outer connecting beams are connected to each other as a whole. Any two adjacent outer connecting beams among the four outer connecting beams are perpendicular to each other, and any two opposite outer connecting beams are parallel to each other; four steel support beams distributed in a cross shape, and the steel support beams are located in the foundation pit for supporting the foundation pit. Each of the four outer connecting beams of the cross-shaped conversion component corresponds to one steel support beam, and one end of the steel support beam is abutted and connected to the corresponding outer connecting beam on the cross-shaped conversion component.

Description

Technical Field

[0001] The present invention relates to the field of foundation pit supports, and particularly to a cross-shaped steel support system for foundation pits. Background Art

[0002] In order to ensure the safety of underground structures and the surrounding environment of foundation pits, support, reinforcement and other protection measures need to be adopted on the side walls and around the foundation pits. The support beams in current foundation pit support projects include two types: concrete support beams and steel support beams. Among them, the steel support beams are used to form a support for the foundation pit by applying pressure with hydraulic jacks and opposing supports inside the foundation pit. Currently, the steel support beams in the foundation pit are generally arranged as straight supports due to the limitations of component functions, or are arranged as corner supports or eight-shaped supports in cooperation with triangular members. When encountering the situation where the steel support beams are cross-distributed, generally the following two methods are adopted,

[0003] First, the cross-distributed steel support beams are arranged in a way of upper and lower two layers. This way increases the space occupied in the height direction, is not conducive to foundation pit construction operations, and will bring the problem of large shear forces generated by the non-closure of the waling.

[0004] Second, two triangular members are directly combined as a cross conversion member (the hypotenuses of the two triangular members are connected by bolts), and the corresponding ends of the four cross-distributed steel support beams are abutted against the waist sides of the two triangular members. In this way, although the cross-distributed steel support beams are distributed at the same elevation, avoiding the problem of large shear forces generated by the non-closure of the waling; however, the cross conversion member as a node itself will have large shear forces (large shear forces will appear at the connection part of the two triangular members), resulting in the problem of shear failure of the cross conversion member. Summary of the Invention

[0005] The purpose of the present invention is to provide a cross-shaped steel support system for foundation pits that can not only make the cross-distributed steel support beams located at the same elevation, but also effectively improve the stability of the cross conversion member, and avoid the problem of shear failure of the cross conversion member as a node.

[0006] The technical solution of the present invention is as follows:

[0007] A cross-shaped steel support system for foundation pits, comprising:

[0008] A cross conversion member, the cross conversion member includes four outer connecting beams, the four outer connecting beams are connected into one body, and any two adjacent outer connecting beams among the four outer connecting beams are perpendicular to each other, and any two relatively distributed outer connecting beams are parallel to each other;

[0009] Four steel support beams distributed in a cross shape. The steel support beams are located in the foundation pit for supporting the foundation pit. Each of the four outer connecting beams of the cross conversion member corresponds to one steel support beam, and one end of the steel support beam abuts and is connected to the corresponding outer connecting beam on the cross conversion member. In this way, the steel support beams distributed in a cross shape are located at the same elevation, which can avoid the problem of large shear force caused by the non-closure of the collar in the prior art due to the adoption of the upper and lower two-layer distribution method. At the same time, the four outer connecting beams of the cross conversion member are connected to each other as a whole. Any two adjacent outer connecting beams among the four outer connecting beams are perpendicular to each other, and any two opposite outer connecting beams are parallel to each other. In this way, the cross conversion member is subjected to right-angle force, mainly tensile and compressive forces, avoiding the problem of shear failure of the cross conversion member as a node, effectively improving the stability of the cross conversion member, and further improving the support stability of the steel support beams distributed in a cross shape.

[0010] Preferably, the cross conversion member further includes at least one inner support layer sequentially distributed from the inside to the outside. The inner support layer is located inside the four outer connecting beams for supporting the outer connecting beams. The same inner support layer includes four inner support beams distributed in a square shape, and the four inner support beams of the same inner support layer are connected end to end in sequence. In this way, on the one hand, the structural strength of the cross conversion member can be further improved, and the stability of the cross conversion member can be improved; on the other hand, the cross conversion member is still subjected to right-angle force, mainly tensile and compressive forces, and the problem of shear failure of the cross conversion member as a node can be avoided.

[0011] Preferably, the inner support beams of the inner support layer close to the outer connecting beam correspond to the outer connecting beams one by one, and the inner support beams of the inner support layer close to the outer connecting beam are connected to the corresponding outer connecting beams by bolts or welding. In this way, the structural strength of the cross conversion member can be further improved, and the stability of the cross conversion member can be improved.

[0012] Preferably, the inner support beams of two adjacent inner support layers correspond to each other one by one, and the inner support beams of two adjacent inner support layers are connected by bolts or welding. In this way, the structural strength of the cross conversion member can be further improved, and the stability of the cross conversion member can be improved.

[0013] Preferably, a reinforcing member is provided between any two adjacent inner support beams in the innermost inner support layer, and the reinforcing member is connected to the inner support beam by bolts or welding. In this way, the structural strength of the cross conversion member can be further improved, and the stability of the cross conversion member can be improved.

[0014] Preferably, the inner support beam is composed of an H-shaped steel, and several reinforcing connecting plates are provided between the two flange plates of the H-shaped steel. In this way, the structural strength of the cross conversion member can be further improved, and the stability of the cross conversion member can be improved.

[0015] Preferably, both ends of the outer transfer beam are connecting inclined surfaces, and the slope of the connecting inclined surface is 45 degrees. The connecting inclined surfaces of any two adjacent outer transfer beams are in contact with each other and are connected into one body by bolts or welding.

[0016] Preferably, the outer transfer beam is composed of an H-shaped steel, and a plurality of strengthening connecting plates are arranged between the two flange plates of the H-shaped steel. In this way, the structural strength of the cross-shaped conversion member can be further improved, and the stability of the cross-shaped conversion member can be improved.

[0017] Preferably, one end of the profiled steel support beam is connected to the corresponding outer transfer beam on the cross-shaped conversion member by bolts. In this way, the connection stability between the profiled steel support beam and the cross-shaped conversion member is ensured.

[0018] Preferably, the profiled steel support beam includes a plurality of profiled steel beams arranged side by side and a plurality of connecting plates. The connecting plates are sequentially distributed along the length direction of the profiled steel beam. The connecting plates connect the profiled steel beams of the profiled steel support beam into one body, and the connecting plates are connected to the profiled steel beam by bolts.

[0019] The beneficial effects of the present invention are as follows: it can not only make the profiled steel support beams distributed in a cross shape located at the same elevation, but also effectively improve the stability of the cross-shaped conversion member, avoid the problem that the cross-shaped conversion member as a node is damaged by shear force, and further improve the support stability of the profiled steel support beams distributed in a cross shape. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a cross-shaped profiled steel support system for a foundation pit in the first specific embodiment of the present invention.

[0021] Figure 2 is a schematic structural diagram of a cross-shaped conversion member in the first specific embodiment of the present invention.

[0022] Figure 3 is an exploded view of a cross-shaped conversion member in the first specific embodiment of the present invention.

[0023] Figure 4 is a schematic structural diagram of a cross-shaped profiled steel support system for a foundation pit in the second specific embodiment of the present invention.

[0024] Figure 5 is a schematic structural diagram of a cross-shaped profiled steel support system for a foundation pit in the third specific embodiment of the present invention.

[0025] In the figure:

[0026] Cross-shaped conversion member 1, outer transfer beam 1.1, inner support layer 1.2, inner support beam 1.21, strengthening member 1.3;

[0027] Profiled steel support beam 2;

[0028] The eight-shaped bracing structure 3, the profiled steel diagonal bracing beam 3.1, and the triangular member 3.2. Specific implementation manners

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners:

[0030] Specific Example 1, as Figure 1 、 Figure 2 shown, a cross-shaped profiled steel bracing system for a foundation pit includes a cross-shaped conversion member 1 and four profiled steel bracing beams 2 distributed in a cross shape. The cross-shaped conversion member 1 includes four outer connecting beams 1.1. The four outer connecting beams are connected to each other as a whole. Any two adjacent outer connecting beams among the four outer connecting beams are perpendicular to each other, and any two relatively distributed outer connecting beams are parallel to each other. In this embodiment, the four outer connecting beams are in a rectangular or square shape. The profiled steel bracing beam 2 is located in the foundation pit for supporting the foundation pit. Each of the four outer connecting beams of the cross-shaped conversion member corresponds to one profiled steel bracing beam. One end of the profiled steel bracing beam 2 is abutted and connected to the corresponding outer connecting beam on the cross-shaped conversion member. The four profiled steel bracing beams distributed in a cross shape are at the same elevation.

[0031] The cross-shaped profiled steel bracing system for a foundation pit in this embodiment is supported in the foundation pit by connecting one end of four profiled steel bracing beams distributed in a cross shape to the corresponding outer connecting beam on the cross-shaped conversion member, so that the profiled steel bracing beams distributed in a cross shape are at the same elevation, which can avoid the problem of large shear force caused by the non-closure of the waling in the prior art due to the arrangement in the form of upper and lower two layers. At the same time, the four outer connecting beams of the cross-shaped conversion member are connected to each other as a whole. Any two adjacent outer connecting beams among the four outer connecting beams are perpendicular to each other, and any two relatively distributed outer connecting beams are parallel to each other. In this way, the cross-shaped conversion member is in a right-angle force state, mainly in tension and compression, avoiding the problem of shear failure of the cross-shaped conversion member as a node, effectively improving the stability of the cross-shaped conversion member, and further improving the support stability of the profiled steel bracing beams distributed in a cross shape.

[0032] In addition, compared with the assembly forms of traditional eight-shaped braces or corner braces, the cross-shaped profiled steel bracing system for a foundation pit in this embodiment has good stability of the cross-shaped conversion member as a node. The middle intersection point is equivalent to a stable node, which can reduce the slenderness ratio of the profiled steel bracing beams in each direction and enhance the support stability; at the same time, reduce the amount of steel used.

[0033] In one implementation manner of this embodiment, as Figure 1As shown in the figure, the other end of the profiled steel support beam 2 is supported on the inner wall of the foundation pit through the inclined bracing structure 3. The inclined bracing structure 3 includes three triangular members 3.2 and two profiled steel inclined bracing beams 3.1 distributed in a V shape. One of the three triangular members is fixed to the other end of the profiled steel support beam, and the other two triangular members are fixed to the inner wall of the foundation pit. One end of the profiled steel inclined bracing beam abuts against the waist side of the triangular member at the other end of the profiled steel support beam, and the other end of the profiled steel inclined bracing beam abuts against the waist side of the triangular member on the inner wall of the foundation pit.

[0034] In another implementation manner of this embodiment, the other end of the profiled steel support beam is directly supported on the inner wall of the foundation pit.

[0035] Furthermore, one end of the profiled steel support beam is bolted to the corresponding outer connecting beam on the cross conversion member. In this way, the connection stability between the profiled steel support beam and the cross conversion member is ensured.

[0036] The profiled steel support beam includes a plurality of profiled steel beams arranged side by side and a plurality of connecting plates. The connecting plates are sequentially distributed along the length direction of the profiled steel beams. The connecting plates connect the profiled steel beams of the profiled steel support beam into one body, and the connecting plates are bolted to the profiled steel beams.

[0037] Furthermore, as Figure 2 , Figure 3 shown in the figure, the cross conversion member 1 further includes at least one layer of inner support layers 1.2 distributed sequentially from the inside to the outside. In this embodiment, there are two layers of inner support layers. The inner support layers are located inside the four outer connecting beams and are used to support the outer connecting beams. The four inner support beams 1.21 of the same inner support layer 1.2 are distributed in a square shape. The four inner support beams of the same inner support layer are connected end to end in sequence. In this way, on the one hand, the structural strength of the cross conversion member can be further improved, and the stability of the cross conversion member can be improved; on the other hand, the cross conversion member still bears right-angle forces and is mainly subjected to tensile and compressive forces, which can avoid the problem of shear failure of the cross conversion member as a node. In this embodiment, the four inner support beams of the same inner support layer are distributed in a rectangular or square shape.

[0038] Furthermore, as Figure 2 shown in the figure, the inner support beams 1.21 of the inner support layer 1.2 close to the outer connecting beam 1.1 correspond to the outer connecting beams one by one, and the inner support beams of the inner support layer close to the outer connecting beam are connected to the corresponding outer connecting beams by bolts or welding. In this way, the structural strength of the cross conversion member can be further improved, and the stability of the cross conversion member can be improved.

[0039] Furthermore, as Figure 2 shown in the figure, the inner support beams of two adjacent inner support layers are in one-to-one correspondence, and the inner support beams of two adjacent inner support layers are connected by bolts or welding. In this way, the structural strength of the cross conversion member can be further improved, and the stability of the cross conversion member can be improved.

[0040] Furthermore, as Figure 1 、 Figure 2 shown, between any two adjacent inner support beams distributed in the innermost inner support layer, a reinforcing member 1.3 is provided, and the reinforcing member is connected to the inner support beam by bolts or welding. In this way, the structural strength of the cross conversion member can be further improved, and the stability of the cross conversion member can be improved.

[0041] Furthermore, as Figure 1 、 Figure 2 shown, the two ends of the outer transfer beam 1.1 are connecting inclined surfaces, the slope of the connecting inclined surface is 45 degrees, and the connecting inclined surfaces of any two adjacent outer transfer beams are in contact with each other and are connected into one body by bolts or welding.

[0042] Furthermore, the inner support beam is composed of an H-shaped steel, and a plurality of reinforcing connecting plates are provided between the two flange plates of the H-shaped steel. In this way, the structural strength of the cross conversion member can be further improved, and the stability of the cross conversion member can be improved.

[0043] The outer transfer beam is composed of an H-shaped steel, and a plurality of reinforcing connecting plates are provided between the two flange plates of the H-shaped steel. In this way, the structural strength of the cross conversion member can be further improved, and the stability of the cross conversion member can be improved.

[0044] Specific Embodiment 2, the rest of the structure of this embodiment refers to Specific Embodiment 1, the difference is that,

[0045] As Figure 4 shown, in this embodiment, there are two cross conversion members 1. Around each cross conversion member, four steel support beams 2 are distributed in a cross shape, and one steel support beam 2 is distributed between the two cross conversion members 1. One end of this steel support beam is connected to the outer transfer beam of one cross conversion member, and the other end of this steel support beam is connected to the outer transfer beam of the other cross conversion member. The support methods of the remaining steel support beams refer to Specific Embodiment 1.

[0046] Specific Embodiment 3, the rest of the structure of this embodiment refers to Specific Embodiment 1, the difference is that,

[0047] As Figure 5As shown in the figure, in this embodiment, there are four cross-shaped conversion members 1. The four cross-shaped conversion members are distributed at the four vertex positions of a rectangle or a square. Four steel support beams 2 distributed in a cross shape are arranged around each cross-shaped conversion member. One of the steel support beams 2 is distributed between any two adjacent cross-shaped conversion members 1 (that is, there are a total of four steel support beams distributed between two adjacent cross-shaped conversion members), and the remaining steel support beams are distributed between the corresponding cross-shaped conversion members and the inner wall of the foundation pit. The two ends of the steel support beam distributed between two cross-shaped conversion members are connected to the outer connecting beams of the corresponding cross-shaped conversion members. The support method of the steel support beam distributed between the cross-shaped conversion member and the inner wall of the foundation pit refers to the specific embodiment 1.

[0048] The above are only the preferred embodiments of the present invention and do not impose any limitations on the present invention. Any simple modification, change, and equivalent transformation made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A cross-shaped steel support system for foundation pits, characterized in that Comprising: A cross-shaped conversion member, which includes four outer connecting beams. The four outer connecting beams are connected to each other as a whole. Any two adjacent outer connecting beams among the four outer connecting beams are perpendicular to each other, and any two opposite outer connecting beams are parallel to each other. Four steel support beams distributed in a cross shape. The steel support beams are located in the foundation pit for supporting the foundation pit. Each of the four outer connecting beams of the cross-shaped conversion member corresponds to one steel support beam. One end of the steel support beam is abutted and connected to the corresponding outer connecting beam on the cross-shaped conversion member. The cross-shaped conversion member further includes at least one inner support layer distributed in sequence from the inside to the outside. The inner support layer is located inside the four outer connecting beams for supporting the outer connecting beams. The same inner support layer includes four inner support beams distributed in a square shape, and the four inner support beams of the same inner support layer are connected end to end in sequence.

2. The cross-shaped steel support system for foundation pits according to claim 1 is characterized in that, The inner support beams of the inner support layer close to the outer connecting beam correspond to the outer connecting beams one by one, and the inner support beams of the inner support layer close to the outer connecting beam and the corresponding outer connecting beams are connected by bolts or welding.

3. The cross-shaped steel support system for foundation pits according to claim 1 or 2, characterized in that, The inner support beams of two adjacent inner support layers correspond to each other one by one, and the inner support beams of two adjacent inner support layers are connected by bolts or welding.

4. The cross-shaped steel support system for foundation pits according to claim 1 or 2, characterized in that, A reinforcing member is provided between any two adjacent inner support beams in the innermost inner support layer, and the reinforcing member and the inner support beam are connected by bolts or welding.

5. The cross-shaped steel support system for foundation pits according to claim 1 or 2, characterized in that, The inner support beam is composed of an H-shaped steel, and a plurality of reinforcing connecting plates are provided between the two flange plates of the H-shaped steel.

6. The cross-shaped steel support system for foundation pits according to claim 1 or 2, characterized in that, Both ends of the outer connecting beam are connecting inclined surfaces, and the slope of the connecting inclined surface is 45 degrees. The connecting inclined surfaces of any two adjacent outer connecting beams are abutted against each other and connected into a whole by bolts or welding.

7. The cross-shaped steel support system for foundation pits according to claim 1 or 2, characterized in that, The outer connecting beam is composed of an H-shaped steel, and a plurality of reinforcing connecting plates are provided between the two flange plates of the H-shaped steel.

8. The cross-shaped steel support system for foundation pits according to claim 1 or 2, characterized in that, One end of the steel support beam is bolted to the corresponding outer connecting beam on the cross-shaped conversion member.

9. The cross-shaped steel support system for foundation pit according to claim 1 or 2, characterized in that, The steel support beam includes a plurality of steel beams arranged side by side and a plurality of connecting plates. The connecting plates are sequentially distributed along the length direction of the steel beam. The connecting plates connect the steel beams of the steel support beam into a whole, and the connecting plates and the steel beam are connected by bolts.

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