Multi-hinge connection node in foundation pit string truss support

Abstract

The utility model provides a multi-hinge connecting node in a foundation pit string truss support. The multi-hinge connecting node comprises a multi-hinge connecting piece, a pull rod and a web member, the two sides of the multi-hinge connecting piece are hinged and fixed to the pull rods on the two sides correspondingly, and the bottom of the multi-hinge connecting piece is hinged and fixed to the web members. The multi-hinge connecting piece comprises three first lug plates, the two ends of the pull rod are each provided with two second lug plates, and after the two second lug plates are inserted into the two gaps among the three first lug plates respectively, hinge fixing is achieved through pin shafts; according to the multi-hinge connecting node, the connecting mode that the lug plates are matched with the pin shafts is adopted, so that the connecting parts can deflect in a self-adaptive mode, and the steering angle of the truss node part is adapted; therefore, universality is achieved, and one standard component can be adopted to be matched with all the middle nodes. Meanwhile, the front and the back of the multi-hinge connection node comprise five lug plates for hinging, so that the stability of the hinged node is improved, and the situation that a single lug plate is easy to deform in the stress process to influence the deformation of the whole structure of the truss string structure support is avoided.

Description

Technical Field

[0001] This utility model relates to the field of tensioned truss support technology for foundation pits, and in particular to a multi-hinge connection node in tensioned truss support for foundation pits. Background Technology

[0002] In underground structural engineering, specialized foundation pit support construction is required to meet excavation conditions and control deformation of the surrounding environment. Some foundation pit support projects utilize plate-type support systems, which involve constructing retaining walls such as cast-in-place piles, steel piles, or diaphragm walls around the foundation pit. An in-pit bracing system is installed at the top and middle of the retaining walls within the pit to act as reaction points, balancing the earth pressure outside the retaining walls. The bracing system typically uses steel bracing or reinforced concrete bracing. Steel bracing is widely used in foundation pit engineering due to its advantages such as fast installation, convenient construction, recyclability and reusability, ability to balance loads and control foundation pit deformation, and low cost.

[0003] Existing steel support systems generally consist of several parts, including walers, chord beams, corner braces, and steel beams. In this system, the chord beams play a role in increasing the span of the foundation pit, balancing its deformation, reducing the number of columns, and minimizing the impact on the basement floor slab. Currently used chord beams mainly consist of tie rods, web members, and cables. To balance foundation pit deformation, the connection nodes between these three components in the chord beam must meet the structural requirements of high flexibility and high-strength connections. Existing connection nodes are difficult to meet both of these conditions. Utility Model Content

[0004] The purpose of this invention is to propose a multi-hinged connection node that enables flexible adjustment of the connection between the tie rod, web member, and cable in a chord beam, while maintaining a stable connection structure.

[0005] To achieve the above objectives, this utility model proposes a multi-hinged connection node in a tensioned truss support for a foundation pit, including a multi-hinged connector, a tie rod, and a web member;

[0006] The two sides of the multi-hinged connector are respectively hinged and fixed to the tie rods on both sides, and the bottom of the multi-hinged connector is hinged and fixed to the web rod.

[0007] The multi-hinged connector includes three first ear plates, and two second ear plates are provided at both ends of the pull rod. After the two second ear plates are respectively inserted into the two gaps between the three first ear plates, the hinge is fixed by a pin.

[0008] Furthermore, the pull rod is a steel pipe, with two slots on the end plates at both ends of the steel pipe. The bottom of the two second ear plates are inserted into the slots and then welded and fixed.

[0009] Furthermore, the end of the web member is provided with two third ear plates; the three first ear plates are movably connected between the two third ear plates by a pin.

[0010] Furthermore, the end of the web member is connected to the third ear plate via a flange, and reinforcing ribs are provided between the flange and the side of the web member.

[0011] Furthermore, the top of the multi-hinged connector is provided with a sliding saddle, which has a through hole for the cable to pass through.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] 1. The multi-hinged connection node design of this utility model has three ear plates, which are staggered and hinged with two ear plates at the end of the tie rod, and at the same time with two ear plates at the end of the upper web member, which is equivalent to five ear plates being hinged together, greatly improving the stability of the hinged node. Each connecting component includes at least two ear plates for connection, avoiding the problem that a single ear plate is prone to deformation during the stress process, which affects the overall structural deformation of the tensioned truss support.

[0014] 2. The multi-hinged connection node of this utility model adopts the connection method of ear plate and pin shaft, which enables the connection component to self-adapt to the deflection and adapt to the turning angle of the truss node; thus achieving versatility, a standard component can be used to adapt to all intermediate nodes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the tensioned truss support in an embodiment of this utility model;

[0016] Figure 2 This is a structural schematic diagram of the multi-hinge connection node in an embodiment of the present invention;

[0017] Figure 3 This utility model Figure 2 A cross-sectional view of the AA plane;

[0018] Figure 4 This utility model Figure 2 A cross-sectional view of the BB plane;

[0019] Figure 5 This is a schematic diagram of the structure of the pull rod according to an embodiment of the present utility model;

[0020] Figure 6 This is a cross-sectional view of the end of the pull rod in an embodiment of this utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be further described below.

[0022] This utility model proposes a multi-hinged connection node in a tensioned truss support for a foundation pit, such as... Figure 1As shown, this node is composed of three parts: the tie rod 3, the web member 4, and the cable 5, connected by a multi-hinged connector 2. Figure 1 As shown, the tensioned truss support consists of several parts: multi-hinged connectors 2, tie rods 3, web members 4, and cables 5. In practical applications, at least one set of tensioned truss supports should be provided on multiple sides of the foundation pit waler 1. The tensioned truss supports, together with other structures in the support system such as main beams and corner beams, jointly support the foundation pit waler 1. Figure 1 The diagram shows a tensioned truss support structure installed on one side of the foundation pit waler 1.

[0023] In this embodiment, as Figure 2 As shown, the multi-hinged connector 2 is used to connect the tie rods 3 on both sides, the bottom web member 4, and the through-and-fixed cable 5. To ensure flexible adjustment of the connection nodes, the multi-hinged connector 2 is hinged to both the tie rods 3 and the web member 4. The multi-hinged connector 2 includes three first ear plates 21, as shown... Figure 5 As shown, both ends of the pull rod 3 are provided with two second ear plates 31, as... Figure 4 As shown, after inserting the two second ear plates 31 into the two gaps between the three first ear plates 21, they are fixed by hinges through pins. The staggered hinge method of the three first ear plates 21 of the multi-hinged connector 2 and the two second ear plates 31 at the end of the tie rod 3 facilitates the positioning of the hinge. At the same time, compared with the application of a single ear plate, the multiple ear plates can increase the strength of the end of the tie rod 3 and avoid the deformation of a single ear plate during the stress process, which would affect the overall stress structure of the tensioned truss support.

[0024] In this embodiment, as Figure 6 As shown, in order to facilitate the overall processing of the pull rod 3, the pull rod 3 is a steel pipe, and two slots are opened on the end plates at both ends of the steel pipe. The bottom of the two second ear plates 31 are inserted into the slots and then welded and fixed.

[0025] In this embodiment, as Figure 3 As shown, the end of the web member 4 is provided with two third ear plates 41; three first ear plates 21 are movably connected between the two third ear plates 41 by pins; the two third ear plates 41 are hinged to the outside of the three first ear plates 21, while the two second ear plates 31 are hinged to the inside of the three first ear plates 21, so that the hinge joint forms a fixed five ear plates, which has high structural strength and is not easily deformed. At the same time, the movement between the first ear plates 21, the second ear plates 31 and the third ear plates 41 will not affect each other, and the adjustment flexibility is high. This avoids the excessive deformation of traditional non-prestressed chord beams, which makes it difficult to meet the needs of controlling the deformation of the foundation pit.

[0026] In this embodiment, as Figure 3 As shown, the end of the web member 4 is connected to the third ear plate 41 by a flange, and a reinforcing rib 42 is provided between the flange and the side of the web member 4, thereby effectively enhancing the strength of the web member 4.

[0027] In this embodiment, the top of the multi-hinged connector 2 is provided with a sliding saddle 22, and the sliding saddle 22 is provided with a through hole for the cable 5 to pass through. The sliding saddle 22 provides fixation for the cable 5 and facilitates the cable 5 to shuttle back and forth.

[0028] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A multi-hinged connection joint in a foundation-spanning truss support, characterized by, The multi-hinged connecting piece, the pull rod and the web member are included; The multi-hinged connecting piece is hingedly fixed with the pull rod on both sides and the web member at the bottom; The multi-hinged connecting piece includes three first ear plates, both ends of the pull rod are provided with two second ear plates, the two second ear plates are respectively inserted into two gaps between the three first ear plates, and hinged fixing is realized through a pin shaft.

2. The multi-pin joint in a foundation beam string truss support according to claim 1, wherein, The pull rod is a steel pipe, two end plates at both ends of the steel pipe are provided with two insertion grooves, and the bottom of the two second ear plates is inserted into the insertion grooves and welded and fixed.

3. The multi-pin joint in a foundation beam string truss support according to claim 1, wherein, The end of the web member is provided with two third ear plates, and the three first ear plates are movably connected between the two third ear plates through a pin shaft.

4. The multi-pin joint in a foundation beam string truss support according to claim 3, wherein, The web member is connected with the third ear plate through a flange plate, and a reinforcing rib is arranged between the flange plate and the side edge of the web member.

5. The multi-pin joint in a foundation beam string truss support according to claim 1, wherein, The top of the multi-hinged connecting piece is provided with a sliding saddle, and the sliding saddle is provided with a through hole for the passing of a cable.

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