Foundation pit riding track cantilever steel structure joist system based on inner support

Abstract

A foundation pit riding track overhanging steel structure joist system based on an inner support comprises a triangular overhanging joist and a vertical beam (1) and is characterized in that the triangular overhanging joist is an atypical channel steel tripod, the vertical beam (1) is a double-channel-steel vertical beam, and the top of the vertical beam is fixedly welded through a welding plate embedded in the side face of a supporting beam (2) in a matched mode; when the cantilever steel structure joist system is used, a plurality of inner supports are arranged according to the height of a foundation pit, and a ladder cage is arranged between the upper inner support layer and the lower inner support layer. The foundation pit riding track cantilever steel structure joist system based on the inner support has the advantages that the joist system is simple in structure and convenient to manufacture, the installation problem of a combined type frame ladder cage located in the middle area of a foundation pit is solved, the safety and the convenience of application of a foundation pit riding track are improved, the joist system can be used in a turnover mode, and the economical efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a frame type ladder cage foundation pit horseway, in particular to a foundation pit horseway cantilever steel structure support beam system based on internal support. Background Art

[0002] At present, combined frame ladder cages are used for pedestrian walkways in deep foundation pit projects. They are mostly installed at the crown beams around the foundation pit, and rarely installed at the supporting beams inside the foundation pit. Conventional foundation forms do not meet the installation conditions, affecting the use of the ladder cages. There is no unified standard for the installation foundation of the ladder cage, resulting in diverse on-site installation conditions, which do not meet the conditions for recycling and cause waste of raw materials. In addition, there are safety hazards in the use of the ladder cages.

[0003] Therefore, the known method of arranging the supporting beams inside the foundation pit has the above-mentioned inconveniences and problems. Utility Model Content

[0004] The purpose of the utility model is to provide a safe and reliable foundation pit horseway cantilever steel structure support beam system based on internal support.

[0005] To achieve the above purpose, the technical solution of the utility model is:

[0006] A cantilever steel structure joist system for a foundation pit horseway based on internal support, comprising a triangular cantilever joist and a vertical beam, characterized in that:

[0007] The triangular cantilever joist is an atypical channel steel tripod, and the triangular cantilever joist includes a horizontal beam, an oblique brace, and an oblique rod. One end of the horizontal beam is provided with a plurality of bolt holes, and one end of the horizontal beam is arranged at the top of the support beam. The support beam is a reinforced concrete beam, and the reinforced concrete beam is pre-embedded with screws that match the bolt holes. The other end of the horizontal beam is fixedly welded to one end of the oblique brace, one end of the oblique rod is fixedly welded to the middle of the oblique brace, and the other end of the oblique rod is fixedly welded to the horizontal beam arranged at the top of the support beam, thereby the horizontal beam, the oblique brace, and the oblique rod constitute a triangular cantilever joist with an atypical tripod structure.

[0008] The vertical beam is a double-channel steel vertical beam, and the top of the vertical beam is fixedly welded by a welding plate pre-buried in the side of the supporting beam;

[0009] Among them: When the cantilever steel structure support beam system is used, several internal supports are set according to the height of the foundation pit, and ladder cages are provided between the upper and lower internal support layers.

[0010] The cantilevered steel structure support beam system of the foundation pit horseway based on internal support of the utility model can also be further realized by adopting the following technical measures.

[0011] The aforementioned foundation pit horseway cantilevered steel structure joist system based on internal support, wherein the screw rod is a high-strength screw rod and is equipped with a high-strength butterfly nut.

[0012] The aforementioned foundation pit ramp cantilever steel structure supporting beam system based on internal support, wherein the length of the screw is 1 / 2 of the height of the support beam, the diameter is 25 mm, and the pull-out strength requirement for a single screw is ≥20 KN.

[0013] The aforementioned foundation pit ramp cantilever steel structure supporting beam system based on internal support, wherein the triangular cantilever supporting beam is made of double channel steels, and the specification of the channel steel is [18a channel steel.

[0014] The aforementioned foundation pit ramp cantilever steel structure supporting beam system based on internal support, wherein the thickness of the connecting plate is 10 mm, and the size is 166 mm × 80 mm.

[0015] After adopting the above technical solution, the foundation pit ramp cantilever steel structure supporting beam system of the present utility model has the following advantages:

[0016] 1. The supporting beam system has a simple structure and is convenient to manufacture;

[0017] 2. Solve the installation problem of the combined frame ladder cage in the middle area of the foundation pit;

[0018] 3. Improve the safety and convenience of the application of the foundation pit ramp. The supporting beam system can be recycled, improving the economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the cantilever steel structure supporting beam system of the embodiment of the present utility model;

[0020] Figure 2 It is a schematic diagram of the application state of the foundation pit ramp cantilever steel structure supporting beam system of the embodiment of the present utility model.

[0021] In the figure: 1 vertical beam, 2 support beam, 3 screw, 4 horizontal beam, 5 vertical rod, 6 diagonal bracing rod, 7 diagonal rod, 8 ladder cage, 9 drainage ditch, 10 foundation pit bottom, 11 first internal support, 12 second internal support, 13 third internal support, 14 fourth internal support, 15 foundation pit wall, 16 foundation pit top. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described in detail below in conjunction with the embodiments and their accompanying drawings.

[0023] Embodiment 1

[0024] Now please refer to Figure 1 , the foundation pit ramp cantilever steel structure supporting beam system of the present invention is provided with three parts: an anchoring device, a double channel steel triangular cantilever supporting beam, and a double channel steel back-to-top vertical beam.

[0025] All the steel materials in the foundation pit ramp cantilever steel structure supporting beam system of the present invention are made of Q235B material, and the welding is full welding with E50 welding wire.

[0026] I. Installation of the anchoring device

[0027] 1. The anchoring device is installed on the supporting beam, and the installation position is determined before the construction of the supporting beam;

[0028] 2. There are two groups of anchoring devices, including 6 long screw rods, 6 steel washers and 6 high-strength butterfly nuts in total.

[0029] 3. The long screw rod 3 is pre-embedded in the supporting beam 2 in advance. The length of the screw rod = 1 / 2 of the height of the supporting beam + 300 mm (exposed length), the diameter is 25 mm, and the single root pulling strength requirement is ≥20 KN.

[0030] 4. The thickness of the steel washer is 10 mm, and the size is 166 mm×80 mm.

[0031] II. Double-channel steel triangular cantilever beam

[0032] 1. The triangular cantilever beam is welded by [18a channel steel and connecting plates. The triangular cantilever beam includes a horizontal beam 4, a diagonal brace 6 and a diagonal rod 7. One end of the horizontal beam is provided with a number of bolt holes. One end of the horizontal beam is arranged on the top of the supporting beam 2. The supporting beam is a reinforced concrete beam, and the screw rod 3 matching the bolt holes is pre-embedded in the reinforced concrete beam. The other end of the horizontal beam is fixedly welded to one end of the diagonal brace 6. One end of the diagonal rod 7 is fixedly welded to the middle of the diagonal brace 6. The other end of the diagonal rod 7 is fixedly welded to the horizontal beam 4 arranged at the top of the supporting beam 2. Thus, the horizontal beam 4, the diagonal brace 6 and the diagonal rod 7 form a triangular cantilever beam with a non-standard triangular frame structure.

[0033] 2. The thickness of the connecting plate is 10 mm, and the size is 166 mm×80 mm.

[0034] 3. The welding spacing of the connecting plates is ≤1000 mm.

[0035] III. Double-channel steel back-to-top vertical beam

[0036] 1. The back-to-top vertical beam 1 includes [28a double-channel steel beam and welding plates;

[0037] 2. The welding plates are arranged on the side of the supporting beam, with a thickness of 10 mm and a size of 400 mm×300 mm.

[0038] 3. The pre-embedded welding plates and the supporting beam are welded and connected by 4C25 pre-embedded steel bars, and the embedded depth of the steel bars is 300 mm.

[0039] 4. The [28a double-channel steel beam is welded by [28a channel steel and connecting plates.

[0040] 5. The thickness of the connecting plate is 10 mm, and the size is 194 mm×80 mm.

[0041] 6. The welding spacing of the connecting plates is ≤1000 mm.

[0042] 7. The length of the back-topping vertical beam is determined according to the actual height difference of the support beam.

[0043] IV. Installation of the combined frame ladder cage of the present invention

[0044] In this embodiment, four internal supports 11, 12, 13, and 14 are sequentially arranged from the top of the foundation pit to the bottom of the foundation pit. Drainage ditches are provided on the outer sides of the top and bottom of the foundation pit wall of the foundation pit. For the four internal supports arranged according to the height of the foundation pit, a ladder cage is provided between the upper and lower internal support layers.

[0045] The utility model has substantial features and remarkable technical progress. The cantilever steel structure supporting beam system of the foundation pit runway based on the internal support of the utility model, and the combined frame type ladder cage provides convenience and safety guarantee for personnel to go up and down the foundation pit during the construction process; the combined frame type ladder cage is installed at the capping beam around the foundation pit. However, for the construction of deep foundation pit projects under narrow site conditions, the first internal support needs to be provided with a sealing plate as construction roads, processing sites, material storage yards and other areas, and it is not suitable to install the ladder cage runway at the capping beam around the foundation pit. The installation area is adjusted to the position of the internal support beam inside the foundation pit. The purpose of the present invention is to provide a safe, economical and reusable cantilever steel structure supporting beam system for the combined frame type ladder cage installed in the foundation pit support beam area.

[0046] The above embodiments are only for illustrating the utility model, rather than limiting the utility model. Those skilled in the relevant technical fields can also make various transformations or changes without departing from the spirit and scope of the utility model. Therefore, all equivalent technical solutions should also belong to the scope of the utility model and should be defined by each claim.

Claims

1. A cantilever steel structure joist system for a foundation pit horseway based on internal support, comprising a triangular cantilever joist and a vertical beam (1), characterized in that: The triangular cantilever joist is an atypical channel steel tripod, the triangular cantilever joist comprising a horizontal beam (4), a diagonal brace (6), and a diagonal rod (7), one end of the horizontal beam being provided with a plurality of bolt holes, one end of the horizontal beam being arranged at the top of the support beam (2), the support beam being a reinforced concrete beam, the reinforced concrete beam being pre-embedded with a screw rod (3) matching the bolt holes, the other end of the horizontal beam being fixedly welded to one end of the diagonal brace (6), one end of the diagonal rod (7) being fixedly welded to the middle of the diagonal brace (6), and the other end of the diagonal rod (7) being fixedly welded to the horizontal beam (4) arranged at the top of the support beam (2), thereby forming a triangular cantilever joist of an atypical tripod structure with the horizontal beam (4), the diagonal brace (6), and the diagonal rod (7); The vertical beam (1) is a double-channel steel vertical beam, and the top of the vertical beam is fixedly welded by a welding plate pre-buried in the side of the support beam (2); Among them: When the cantilever steel structure support beam system is used, several internal supports are set according to the height of the foundation pit, and ladder cages are provided between the upper and lower internal support layers.

2. The cantilever steel structure joist system for the foundation pit horseway based on internal support as claimed in claim 1 is characterized in that: The screw is a high-strength screw and is equipped with a high-strength butterfly nut.

3. The cantilevered steel structure joist system for the foundation pit bridleway based on internal support as claimed in claim 1 is characterized in that: The length of the screw is 1 / 2 of the support beam height, the diameter is 25 mm, and the pull-out strength requirement for a single screw is ≥ 20 KN.

4. The cantilever steel structure joist system for the foundation pit bridleway based on internal support as claimed in claim 1 is characterized in that: The triangular cantilever support beam is made of double channel steel, and the channel steel specification model is 18a channel steel.

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