Foundation pit combined trestle construction device

Abstract

A kind of foundation pit combined trestle construction device, including prefabricated trestle plate and support beam, the four peripheral edges of prefabricated trestle plate are provided with sinking hole, bolt hole is reserved on support beam, support beam is constructed across lattice column, the top of support beam is equipped with support beam rabbet, prefabricated trestle plate is assembled between support beam rabbet of the top of support beam, support upper turnover beam is set on support beam between the assembly joint of prefabricated trestle plate, prefabricated trestle plate is fastened on support beam by fastening bolt passing through sinking hole and bolt hole.The utility model can modular production, can be used repeatedly many times, be favorable to environmental protection, operation is safe, simple, convenient to operate, simple, convenient, flexible, while improving foundation pit construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support and trestle construction technology, and in particular to a foundation pit combined trestle construction device. Background Technology

[0002] With the intensive development and efficient utilization of urban underground space, deep foundation pits have become an important part of urban infrastructure development, and these pits are increasingly characterized by their depth, size, and density. In soft soil and areas with unfavorable geological conditions, the initial support and trestle bridges for foundation pits are often made of concrete. Concrete trestle bridges require formwork construction on unfavorable geological conditions, necessitating foundation hardening treatment, typically by pouring a subbase or laying formwork and timber of a certain thickness. Construction is significantly affected by the rainy season and groundwater runoff. Due to their large size, dismantling requires mechanical demolition, resulting in significant noise and air pollution. Furthermore, the zoning of foundation pit excavation is affected by the placement of the trestle bridge, limiting the excavation speed. The construction and dismantling of trestle bridges are time-consuming, detrimental to foundation pit safety and construction management. Additionally, as temporary works, the construction waste from dismantling trestle bridges requires separate disposal, failing to meet environmental protection and green, low-carbon construction requirements. Summary of the Invention

[0003] This utility model aims to address the shortcomings of existing technologies by providing a construction device for a combined trestle bridge in a foundation pit.

[0004] To achieve the above objectives, this utility model adopts the following technical solution:

[0005] A construction device for a prefabricated trestle bridge in a foundation pit includes prefabricated trestle slabs and support beams. The four perimeters of the prefabricated trestle slabs are provided with sinking holes, and bolt holes are pre-drilled on the support beams. The support beams are constructed across lattice columns, and the top of the support beams is provided with support beam tongues and grooves. Prefabricated trestle slabs are assembled between the tongues and grooves of the top support beams. Support beams are installed on the support beams between the assembly joints of the prefabricated trestle slabs. The prefabricated trestle slabs are fastened to the support beams by fastening bolts passing through the sinking holes and bolt holes.

[0006] The prefabricated trestle decks include prefabricated concrete trestle decks or steel trestle decks.

[0007] The height of the supporting upturned beam is the same as the thickness of the prefabricated trestle slab.

[0008] The width of the tongue and groove joint of the supporting beam can meet the maximum load-bearing capacity of the precast trestle slab.

[0009] The diameter of the recessed hole is larger than the diameter of the mechanical drill bit used for fastening the bolts.

[0010] The beneficial effects of this utility model are: it can be produced in a modular manner, can be reused multiple times, is conducive to environmental protection, is safe and simple to operate, and is convenient and flexible to install and dismantle, while improving the efficiency of foundation pit construction. Attached Figure Description

[0011] Figure 1 This is the front view of the present invention;

[0012] Figure 2 This is a top view of the present invention;

[0013] In the diagram: 1-Precast trestle slab; 2-Support beam; 3-Sunk hole; 4-Pre-drilled bolt hole; 5-Lattice column; 6-Support beam tongue and groove; 7-Fastening bolt; 8-Support lifting beam;

[0014] The following will describe in detail the embodiments of this utility model with reference to the accompanying drawings. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] A construction device for a prefabricated trestle bridge in a foundation pit includes a prefabricated trestle slab 1 and a support beam 2. The four sides of the prefabricated trestle slab 1 are provided with sinking holes 3. The support beam 2 is provided with bolt holes 4. The support beam 2 is constructed across a lattice column 5. The top of the support beam 2 is provided with a support beam tongue and groove 6. The prefabricated trestle slab 1 is assembled between the top support beam tongue and groove 6 of the support beam 2. The support beam 2 is provided with a support upturn beam 8 between the assembly joints of the prefabricated trestle slab 1. The prefabricated trestle slab 1 is fastened to the support beam 2 by fastening bolts 7 passing through the sinking holes 3 and bolt holes 4.

[0017] The precast trestle slab 1 includes a precast concrete trestle slab or a steel trestle slab. After the support beam 2 is constructed, the precast concrete trestle slab or steel trestle slab is hoisted and assembled. Some non-standard modules of the precast trestle slab 1 are precast in advance.

[0018] The height of the supporting upturn beam 8 is the same as the thickness of the prefabricated trestle slab 1. The supporting upturn beam 8 is set in the gap between the prefabricated trestle slabs 1 and restricts the horizontal displacement of the prefabricated trestle slab 1.

[0019] The width of the tongue and groove joint 6 of the supporting beam can meet the maximum load-bearing capacity of the prefabricated trestle slab 1.

[0020] The diameter of the recessed hole 3 is larger than the diameter of the mechanical drill bit used when installing the fastening bolt 7.

[0021] When designing the foundation pit support, the dimensions of the trestle are selected and calculated based on the module of the prefabricated trestle panels. The bearing capacity of the trestle is calculated based on the most unfavorable working condition. The specific implementation method is as follows:

[0022] 1) During the construction of the foundation pit support beam 2, the height of the support upturn beam 8 is equal to the thickness of the precast trestle slab 1, and the width of the support beam tongue and groove 6 must meet the maximum bearing capacity of the trestle slab.

[0023] 2) A recessed hole 3 is provided on the prefabricated trestle plate 1. The diameter of the recessed hole 3 is sufficient for the mechanical drill bit to be inserted when the fastening bolt 7 is installed.

[0024] 3) During the construction of the support beam 2, pre-embed the finished bolt holes 4 that match the fastening bolts 7. After the construction of the support beam 2 is completed, hoist the precast concrete trestle or steel trestle for assembly. The non-standard modules of the trestle are prefabricated in advance.

[0025] 4) The precast concrete or steel trestle slabs are connected to the support beam 2 by fastening bolts 7 and the support upturn beam 8 restricts the horizontal displacement of the precast trestle slab 1.

[0026] 5) During the excavation of the foundation pit, the prefabricated trestle slab 1 is dynamically dismantled according to the needs of the soil extraction point, and is then hoisted and recycled in sections after construction is completed.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A construction device for a combined trestle bridge in a foundation pit, characterized in that, The prefabricated trestle slab (1) and support beam (2) are included. The four sides of the prefabricated trestle slab (1) are provided with sinking holes (3). The support beam (2) is provided with bolt holes (4). The support beam (2) is constructed across the lattice column (5). The top of the support beam (2) is provided with a support beam tongue and groove (6). The prefabricated trestle slab (1) is assembled between the support beam tongue and groove (6) at the top of the support beam (2). The support beam (2) is provided with a support upturning beam (8) between the assembly joints of the prefabricated trestle slab (1). The prefabricated trestle slab (1) is fastened to the support beam (2) by fastening bolts (7) passing through the sinking holes (3) and bolt holes (4).

2. The construction device for a combined trestle bridge in a foundation pit according to claim 1, characterized in that, The prefabricated trestle slab (1) includes prefabricated concrete trestle slab or steel trestle slab.

3. The construction device for a combined trestle bridge in a foundation pit according to claim 2, characterized in that, The height of the supporting upturned beam (8) is the same as the thickness of the prefabricated trestle slab (1).

4. The construction device for a combined trestle bridge in a foundation pit according to claim 3, characterized in that, The width of the tongue and groove joint (6) of the supporting beam can meet the maximum bearing capacity of the prefabricated trestle slab (1).

5. The construction device for a combined trestle bridge in a foundation pit according to claim 4, characterized in that, The diameter of the recessed hole (3) is larger than the diameter of the mechanical drill bit used when installing the fastening bolt (7).

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