CN220166940U - Inclined strut structure for foundation pit support - Google Patents

Inclined strut structure for foundation pit support Download PDF

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Publication number
CN220166940U
CN220166940U CN202321390255.4U CN202321390255U CN220166940U CN 220166940 U CN220166940 U CN 220166940U CN 202321390255 U CN202321390255 U CN 202321390255U CN 220166940 U CN220166940 U CN 220166940U
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diagonal bracing
foundation pit
bracing
plate
diagonal
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李瑛�
卢臣涛
童星
刘兴旺
谢锡荣
刘晓燕
黄志鹏
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Zhejiang Province Institute of Architectural Design and Research
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Zhejiang Province Institute of Architectural Design and Research
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Abstract

The utility model discloses an inclined strut structure for foundation pit enclosure, which comprises an enclosure structure and an inclined strut, wherein a connecting structure is arranged on the enclosure structure, the upper end of the inclined strut is connected with the connecting structure through a connecting assembly, the connecting assembly comprises a first connecting node and a second connecting node, the first connecting node is connected with the connecting structure through a first shear key, the second connecting node is connected with the inclined strut through a second shear key, and the first connecting node is hinged with the second connecting node. The scheme has definite stress, and avoids the bending of the diagonal brace or the occurrence of cracks at the joint of the diagonal brace and the connecting structure in the conventional case; the connecting component adopts prefabricated components, can be recycled and is environment-friendly; the connecting component is replaceable, can be used for connecting diagonal bracing members in different forms, and has strong applicability.

Description

Inclined strut structure for foundation pit support
Technical Field
The utility model relates to the technical field of foundation pit support, in particular to an inclined strut structure for foundation pit support.
Background
In the foundation pit enclosure, the green support technology suitable for open excavation construction mostly adopts a precast reinforced concrete enclosure structure, multi-row pile multi-stage support, diagonal bracing and the like. The prior enclosure structure comprises an enclosure pile, a profile steel enclosure structure and the like, wherein an inclined strut in the prior art is rigidly connected with a connecting structure at the upper end of the enclosure structure, and the inclined strut is directly anchored into a top beam at the upper end of the enclosure pile and is integrally and rigidly connected with the top beam in a pouring manner; the other is that the diagonal bracing is directly welded with the steel enclosing purlin at the upper end of the steel enclosing structure. The existing diagonal braces are connected in a rigid mode, so that axial stress exists, and buckling of the diagonal braces is easy to occur; the way of directly anchoring the diagonal bracing into the connecting structure causes the anchoring section of the connecting structure and the two sides of the anchoring section have oblique penetrating cracks.
For example, chinese patent publication No. CN103882869a, publication No. 2014, month 06 and 25, entitled "an oblique support pile structure for foundation pit enclosure and construction method thereof", including a guard pile, a crown beam, a foundation pit bottom plate, a building structure, an oblique support pile, a water stopping device and a soil improvement structure, the oblique support pile being obliquely implanted in original soil below the foundation pit bottom plate at an angle; the top end of the inclined support pile is fixedly connected with the top end of the guard pile, embedded into the crown beam and formed into an integral structure with the crown beam; soil improvement structures are fixed at and around the bottom ends of the inclined support piles; and a water stop device is arranged on the inclined support pile, and the inclined support pile penetrates through the building structure and the foundation pit bottom plate.
The existing patents have the following defects: the existing diagonal braces are connected in a rigid mode, so that axial stress exists, and buckling of the diagonal braces is easy to occur; the way of directly anchoring the diagonal bracing into the connecting structure causes the anchoring section of the connecting structure and the two sides of the anchoring section have oblique penetrating cracks.
Disclosure of Invention
The utility model aims to solve the problems that the existing diagonal brace adopts rigid connection, so that axial stress exists, and the diagonal brace is easy to bend; the inclined strut structure for the foundation pit support is provided, the stress of the node is definite, and the inclined strut is prevented from being bent or cracks are prevented from being generated on the connecting structure.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the utility model provides a bracing structure for foundation ditch enclosure, includes envelope and bracing, be equipped with connection structure on the envelope, the upper end of bracing with connection structure passes through coupling assembling and connects, coupling assembling includes first connected node and second connected node, first connected node is connected with connection structure through first shear key, the second connected node is connected with the bracing through the second shear key, first connected node is articulated to link to each other with the second connected node. According to the diagonal bracing structure for the foundation pit enclosure, the connecting assembly is used for connecting the diagonal bracing and the connecting structure on the enclosure structure, the connecting assembly comprises a first connecting node and a second connecting node which are hinged, the first connecting node is connected with the connecting structure through a first shear key, the second connecting node is connected with the diagonal bracing through a second shear key, the first connecting node is stressed through the first shear key, the connecting part is sheared, the second connecting node is stressed through the second shear key, and the connecting part is sheared. The stress is clear, and the situation that the diagonal brace is bent or the joint of the diagonal brace and the connecting structure is cracked in the conventional situation is avoided. The connecting component adopts prefabricated components, is recyclable and is green and environment-friendly. The connecting component is replaceable, can be used for connecting diagonal bracing members in different forms, and has strong applicability. The problem that the construction of the building envelope and the diagonal bracing in the foundation pit are mutually restricted, the independent construction cannot be realized, and the construction progress is easy to influence is effectively solved.
Preferably, the first connecting node comprises a first end plate and a first lug plate arranged on the first end plate, the first end plate is connected with the connecting structure through a first shear key, the second connecting node comprises a joint and a second lug plate arranged on the joint, the joint is connected with the diagonal brace through a second shear key, and the first lug plate is hinged with the second lug plate. In the scheme, the first shear key and the second shear key adopt shear bolts or shear bars, play a role in bending resistance and shearing resistance, and are clearly stressed.
Preferably, the joints extend and are distributed along the axial direction of the diagonal brace, and the second lug plates are located at the upper ends of the joints. The stress direction of the connector is distributed along the axial direction of the diagonal brace, so that the diagonal brace is prevented from buckling.
Preferably, the joint comprises I-steel, the I-steel comprises a web plate and a wing plate, a second end plate and a third end plate are respectively arranged at two ends of the I-steel, the second ear plate is arranged on the second end plate, the third end plate is connected with the diagonal brace through a second shear key, stiffening ribs are arranged between the web plate and the wing plate, and the web plate in the joint is distributed along the central axis direction of the diagonal brace. The stiffening ribs strengthen the joint strength.
Preferably, the first ear plate and the second ear plate are connected through a pin shaft, a first through hole is formed in the first ear plate, a second through hole is formed in the second ear plate, the pin shaft penetrates through the first through hole and the second through hole, reinforcing washers are arranged at two ends of the pin shaft, and the first ear plate and the second ear plate are located between the reinforcing washers. The reinforcing washer improves the connection strength of the pin shaft. The first ear plate is vertically arranged on the first end plate, the second ear plate is vertically arranged on the second end plate, the first shear key is vertically arranged with the first end plate, and the second shear key is arranged parallel to the central axis of the diagonal brace. Ensuring definite force transmission, wherein the pulling and pressing axial force of the first connecting node is vertical to the first end plate, and preventing cracks from occurring at the joint of the diagonal brace and the connecting structure and at the two sides of the joint; the pulling and pressing shaft force of the second connecting node is distributed along the central axis direction of the diagonal brace, so that the diagonal brace is prevented from buckling.
Preferably, the diagonal brace bending resistance structure further comprises a diagonal brace bending resistance structure, the diagonal brace bending resistance structure comprises a prestress rib, the prestress rib is arranged on one downward side face of the diagonal brace, two anchoring pieces are arranged on the downward side face of the diagonal brace, one anchoring piece is close to the upper end of the diagonal brace, the other anchoring piece is close to the lower end of the diagonal brace, one end of the prestress rib is anchored on one anchoring piece, and the other end of the prestress rib is anchored on the other anchoring piece. And a plurality of brackets are further arranged on the diagonal brace between the two anchoring pieces, and each bracket extends along the length direction of the diagonal brace, and the prestressed tendons are connected with each bracket in an abutting mode so that the prestressed tendons are distributed in an arc shape. Buckling occurs because the upper end of the diagonal brace receives acting force into the foundation pit; therefore, the prestressed tendons are arranged on the diagonal braces above the bottom surface of the foundation pit, the diagonal braces above the bottom surface of the foundation pit are prestressed through the prestressed tendons, so that the diagonal braces above the bottom surface of the foundation pit arch upwards in advance, and when the acting force in the foundation pit is received, the prestressed tendons and the structure of the diagonal braces arch in advance need to be overcome.
Preferably, the diagonal bracing bending-resistant structure further comprises root reinforcing structures distributed along the axial direction of the diagonal bracing, the root reinforcing structures are arranged at the lower part of the diagonal bracing, the lower part of the diagonal bracing is buried in a soil layer of the bottom surface of the foundation pit, one part of the root reinforcing structures is located above the bottom surface of the foundation pit, and the other part of the root reinforcing structures is located below the bottom surface of the foundation pit. And (3) carrying out structural reinforcement at the position where buckling is possibly determined, and additionally arranging a root reinforcing structure to strengthen the structural strength of the diagonal bracing position intersected with the bottom surface of the foundation pit, thereby effectively improving the buckling problem of the diagonal bracing in the foundation pit.
Preferably, the number of the first ear plates is plural, the number of the second ear plates is plural, and the first ear plates and the second ear plates are alternately distributed. The connecting assembly can be hinged with the second connecting node by adopting a plurality of first connecting nodes, and the bearing capacity of the connecting assembly to the pulling and pressing axial force and the shearing force in the lug surface is improved by adopting a multi-pin shaft connecting mode.
Preferably, the connecting structure is a capping beam or a steel purlin. The top-pressing beam is arranged on the guard post, the inclined strut is connected with the top-pressing beam through a connecting structure, and the first connecting node is connected with the top-pressing beam through a first shear key; the steel enclosing purlin is arranged on the steel enclosing structure, and the first connecting node is connected with the steel enclosing purlin through a first shear key.
Preferably, the first shear key and the second shear key are shear bolts or shear bars. The shear bolts or the shear bars play a role in bending resistance and shearing resistance.
Therefore, the utility model has the following beneficial effects: the stress is clear, and the situation that the diagonal brace is bent or the joint of the diagonal brace and the connecting structure is cracked in the conventional situation is avoided; the connecting component adopts prefabricated components, can be recycled and is environment-friendly; the connecting component is replaceable, can be used for connecting diagonal bracing members in different forms, and has strong applicability; the problem that the construction of the building envelope and the diagonal bracing in the foundation pit are mutually restricted, the independent construction cannot be realized, and the construction progress is easy to influence is effectively solved.
Drawings
Fig. 1 is a schematic structural view of a first embodiment of the present utility model.
Fig. 2 is another structural schematic diagram of a first embodiment of the present utility model.
Fig. 3 is a schematic structural view of a diagonal brace and a second connection node in accordance with a first embodiment of the present utility model.
Fig. 4 is a schematic structural diagram of a first connection node according to a first embodiment of the present utility model.
Fig. 5 is a schematic structural diagram of a second connection node according to a first embodiment of the present utility model.
Fig. 6 is a schematic view showing a structure in which a first connection node is provided on a roof rail according to a first embodiment of the present utility model.
Fig. 7 is a schematic view of a first connection node provided on a steel purlin in accordance with one embodiment of the utility model.
Fig. 8 is a schematic structural diagram of a second embodiment of the present utility model.
The following figures are shown:
an enclosure structure 1, diagonal braces 2, a first end plate 3, a first ear plate 4, a first shear key 5,
Joint 6, web 6.1, wing plate 6.2, second end plate 6.3, third end plate 6.4, stiffening rib 6.5,
The second lug plate 7, the second shear key 8, the pin shaft 9, the reinforcing washer 10, the capping beam 11, the steel purlin 12, the prestressed tendons 13, the anchoring parts 14, the root reinforcing structure 15 and the bracket 16.
Detailed Description
In order to make the purposes, technical solutions and advantages of the technical solution embodiments of the present utility model more clear, the present utility model is further described below with reference to the accompanying drawings and the detailed description.
An embodiment I, a bracing structure for foundation ditch enclosure as shown in fig. 1 to 7, including envelope 1 and bracing 2, be equipped with connection structure on the envelope 1, the upper end and the connection structure of bracing 2 pass through coupling assembling and are connected, and coupling assembling includes first connected node and second connected node, and first connected node is connected with connection structure through first shear key 5, and second connected node is connected with bracing 2 through second shear key 8, and first connected node is articulated to link to each other with second connected node.
According to the diagonal bracing structure for foundation pit enclosure, the connecting assembly is used for connecting the diagonal bracing 2 and the connecting structure on the enclosure structure 1, the connecting assembly comprises a first connecting node and a second connecting node which are hinged, the first connecting node is connected with the connecting structure through a first shear key 5, the second connecting node is connected with the diagonal bracing 2 through a second shear key 8, the stress of the first connecting node is clear through the first shear key 5, the stress of the second connecting node is clear through the second shear key 8, and the joint is sheared. The stress is clear, and the bending of the diagonal brace 2 or the crack at the joint of the diagonal brace 2 and the connecting structure in the conventional case is avoided. The connecting component adopts prefabricated components, is recyclable and is green and environment-friendly. The connecting component is replaceable, can be used for connecting diagonal bracing 2 components in different forms, and has strong applicability. The problem that the construction of the enclosure structure 1 and the diagonal bracing 2 in the existing foundation pit are mutually restricted, cannot be independently constructed and easily influences the construction progress is effectively solved. The problem that the existing diagonal brace 2 is subjected to axial stress by adopting rigid connection and is easy to cause buckling of the diagonal brace 2 is solved; the way of directly anchoring the diagonal bracing 2 into the connecting structure causes the problem that the anchoring section of the connecting structure and two sides of the anchoring section have oblique penetrating cracks.
Further, as shown in fig. 2, the first connection node includes a first end plate 3 and a first ear plate 4 disposed on the first end plate 3, the first end plate 3 is connected with the connection structure through a first shear key 5, the second connection node includes a joint 6 and a second ear plate 7 disposed on the joint 6, the joint 6 is connected with the diagonal brace 2 through a second shear key 8, and the first ear plate 4 is hinged with the second ear plate 7. In the scheme, the first shear key 5 and the second shear key 8 adopt shear bolts or shear ribs, play a role in bending resistance and shearing resistance, and are clearly stressed.
Specifically, as shown in fig. 5, the joints 6 extend in the axial direction of the diagonal braces, and the second ear plates 7 are located at the upper ends of the joints 6. The stress direction of the joint 6 is distributed along the axial direction of the diagonal brace 2, so that the diagonal brace 2 is prevented from buckling. The joint 6 comprises I-steel, the I-steel comprises a web plate 6.1 and a wing plate 6.2, two ends of the I-steel are respectively provided with a second end plate 6.3 and a third end plate 6.4, a second lug plate 7 is arranged on the second end plate 6.3, the third end plate 6.4 is connected with the diagonal bracing 2 through a second shear key 8, stiffening ribs 6.5 are arranged between the web plate 6.1 and the wing plate 6.2, and the web plate 6.1 in the joint 6 is distributed along the central axis direction of the diagonal bracing 2. The stiffening ribs 6.5 strengthen the joint 6.
Further, as shown in fig. 2, 3, 4 and 5, the first ear plate 4 and the second ear plate 7 are connected by a pin 9, a first through hole is formed in the first ear plate 4, a second through hole is formed in the second ear plate 7, the pin 9 passes through the first through hole and the second through hole, reinforcing washers 10 are arranged at two ends of the pin 9, and the first ear plate 4 and the second ear plate 7 are located between the reinforcing washers 10. The reinforcing washer 10 improves the connection strength of the pin 9. The first ear plate 4 is vertically arranged on the first end plate 3, the second ear plate 7 is vertically arranged on the second end plate 6.3, the first shear key 5 is vertically arranged with the first end plate 3, and the second shear key 8 is arranged in parallel with the central axis of the diagonal brace 2. Ensuring definite force transmission, wherein the pulling and pressing axial force of the first connecting node is vertical to the first end plate 3, and preventing cracks from occurring at the joint of the diagonal brace 2 and the connecting structure and at the two sides of the joint; the pulling and pressing shaft force of the second connecting node is distributed along the central axis direction of the diagonal brace 2, so that the diagonal brace 2 is prevented from buckling.
Further, as shown in fig. 5 and 6, the number of the first ear plates 4 is plural, the number of the second ear plates 7 is plural, and the first ear plates 4 and the second ear plates 7 are alternately arranged. The connecting assembly can be hinged with the second connecting node by adopting a plurality of first connecting nodes, and the bearing capacity of the connecting assembly to the pulling and pressing shaft force and the shearing force in the lug surface is improved by adopting a multi-pin shaft 9 connecting mode.
Specifically, as shown in fig. 6 and 7, the connection structure is a roof rail 11 or a steel purlin 12. The top beam 11 is arranged on the guard post, the inclined strut 2 is connected with the top beam 11 through a connecting structure, and the first connecting node is connected with the top beam 11 through the first shear key 5; the steel enclosing purlin 12 is arranged on the steel enclosing structure 1, and the first connecting node is connected with the steel enclosing purlin 12 through the first shear key 5. The first and second shear keys 5 and 8 employ shear bolts or shear bars. The shear bolts or the shear bars play a role in bending resistance and shearing resistance.
In the second embodiment, the rest of the structure of the present embodiment refers to the first embodiment, and is different in that, as shown in fig. 8, the structure further includes a bending-resistant structure of the diagonal brace 2, the bending-resistant structure of the diagonal brace 2 includes a prestressed rib 13, the prestressed rib 13 is disposed on a downward side surface of the diagonal brace 2, two anchoring members 14 are disposed on a downward side surface of the diagonal brace 2, one anchoring member 14 is close to the upper end of the diagonal brace 2, the other anchoring member 14 is close to the lower end of the diagonal brace 2, one end of the prestressed rib 13 is anchored to one of the anchoring members 14, and the other end of the prestressed rib 13 is anchored to the other anchoring member 14. The diagonal brace 2 between the two anchoring members 14 is also provided with a plurality of brackets 16, each bracket 16 extends along the length direction of the diagonal brace, and the prestressed tendons 13 are connected with each bracket 16 in an abutting mode, so that the prestressed tendons 13 are distributed in an arc shape. Buckling occurs because the upper end of the diagonal brace 2 receives an acting force into the foundation pit; therefore, the prestressed tendons 13 are arranged on the diagonal braces 2 above the bottom surface of the foundation pit, the diagonal braces 2 above the bottom surface of the foundation pit are prestressed through the prestressed tendons 13, so that the diagonal braces 2 above the bottom surface of the foundation pit arch upwards in advance, and when the acting force in the foundation pit is received, the structure that the prestressed tendons 13 apply the prestressing force and the diagonal braces 2 arch upwards in advance is needed to be overcome.
Further, as shown in fig. 8, the bending-resistant structure of the diagonal brace 2 further includes root reinforcing structures 15 distributed along the axial direction of the diagonal brace 2, the root reinforcing structures 15 are disposed at the lower portion of the diagonal brace 2, the lower portion of the diagonal brace 2 is buried in the soil layer of the bottom surface of the foundation pit, one portion of the root reinforcing structures is located above the bottom surface of the foundation pit, and the other portion is located below the bottom surface of the foundation pit. And the structure reinforcement is carried out at the position where the buckling is possibly determined, and the root reinforcing structure 15 is additionally arranged to strengthen the structural strength of the inclined strut 2 position intersected with the bottom surface of the foundation pit, so that the buckling problem of the inclined strut 2 in the foundation pit is effectively improved.
The utility model has the following beneficial effects: the stress is clear, and the situation that the diagonal brace is bent or the joint of the diagonal brace and the connecting structure is cracked in the conventional situation is avoided; the connecting component adopts prefabricated components, can be recycled and is environment-friendly; the connecting component is replaceable, can be used for connecting diagonal bracing members in different forms, and has strong applicability; the problem that the construction of the building envelope and the diagonal bracing in the foundation pit are mutually restricted, the independent construction cannot be realized, and the construction progress is easy to influence is effectively solved.
The above embodiments are merely preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model. All equivalent changes in shape and structure according to the present utility model are intended to be included in the scope of the present utility model.

Claims (10)

1. The utility model provides a bracing structure for foundation ditch enclosure, includes envelope (1) and bracing (2), be equipped with connection structure on the envelope, its characterized in that, the upper end of bracing with connection structure passes through coupling assembling and connects, coupling assembling includes first connected node and second connected node, first connected node is connected with connection structure through first shear key (5), the second connected node is connected with the bracing through second shear key (8), first connected node is articulated continuous with the second connected node.
2. A diagonal bracing structure for a foundation pit enclosure according to claim 1, wherein the first connection node comprises a first end plate (3) and a first ear plate (4) arranged on the first end plate, the first end plate being connected to the connection structure by a first shear key, and the second connection node comprises a joint (6) and a second ear plate (7) arranged on the joint, the joint being connected to the diagonal bracing by a second shear key, the first ear plate being hinged to the second ear plate.
3. The diagonal bracing structure for foundation pit enclosure of claim 2, wherein the joints are extended and distributed along the axial direction of the diagonal bracing, and the second lug plate is located at the upper end of the joints.
4. A diagonal bracing structure for a foundation pit enclosure according to claim 2 or 3, wherein the joint comprises i-steel, the i-steel comprises a web (6.1) and a wing plate (6.2), two ends of the i-steel are respectively provided with a second end plate (6.3) and a third end plate (6.4), the second ear plate is arranged on the second end plate, the third end plate is connected with the diagonal bracing through a second shear key, stiffening ribs (6.5) are arranged between the web and the wing plate, and the web in the joint is distributed along the central axis direction of the diagonal bracing.
5. A diagonal bracing structure for a foundation pit enclosure according to claim 3, wherein the first ear plate and the second ear plate are connected through a pin shaft (9), a first through hole is formed in the first ear plate, a second through hole is formed in the second ear plate, the pin shaft penetrates through the first through hole and the second through hole, reinforcing washers (10) are arranged at two ends of the pin shaft, and the first ear plate and the second ear plate are located between the reinforcing washers.
6. A diagonal bracing structure for a foundation pit enclosure according to claim 1 or 2 or 3 or 5, further comprising a diagonal bracing bending structure, the diagonal bracing bending structure comprising a pre-stressing tendon (13) arranged on a downward facing side of the diagonal bracing, the downward facing side of the diagonal bracing being provided with two anchors (14), one of which is adjacent to the upper end of the diagonal bracing and the other of which is adjacent to the lower end of the diagonal bracing, one end of the pre-stressing tendon being anchored to one of the anchors and the other end of the pre-stressing tendon being anchored to the other anchor thereof.
7. A diagonal bracing structure for a foundation pit enclosure according to claim 1 or 2 or 3 or 5, wherein the diagonal bracing bending-resistant structure further comprises root reinforcing structures (15) distributed along the axial direction of the diagonal bracing, the root reinforcing structures are arranged at the lower part of the diagonal bracing, the lower part of the diagonal bracing is buried in the soil layer of the foundation pit bottom surface, one part of the root reinforcing structures is located above the foundation pit bottom surface, and the other part of the root reinforcing structures is located below the foundation pit bottom surface.
8. The diagonal bracing structure for foundation pit enclosure according to claim 2, 3 or 5, wherein the number of the first ear plates is plural, the number of the second ear plates is plural, and the first ear plates and the second ear plates are alternately distributed.
9. A bracing structure for foundation pit bracing according to claim 1 or 2 or 3 or 5, wherein the connection structure is a capping beam (11) or a steel purlin (12).
10. The diagonal bracing structure for foundation pit bracing according to claim 9, wherein the first shear key and the second shear key are shear bolts or shear bars.
CN202321390255.4U 2023-06-02 2023-06-02 Inclined strut structure for foundation pit support Active CN220166940U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202321390255.4U CN220166940U (en) 2023-06-02 2023-06-02 Inclined strut structure for foundation pit support

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202321390255.4U CN220166940U (en) 2023-06-02 2023-06-02 Inclined strut structure for foundation pit support

Publications (1)

Publication Number Publication Date
CN220166940U true CN220166940U (en) 2023-12-12

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ID=89059808

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202321390255.4U Active CN220166940U (en) 2023-06-02 2023-06-02 Inclined strut structure for foundation pit support

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CN (1) CN220166940U (en)

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