Assembly type Larsen steel plate trestle

Abstract

The utility model discloses an assembled Larsen steel plate trestle, and relates to the technical field of foundation pit temporary operation platforms. An assembly type Larsen steel plate trestle comprises pile foundations, trestle vertical frames, trestle beam frames and Larsen steel plates, the pile foundations serve as bases of the trestle to be buried in a foundation pit and are formed through concrete pouring, and the trestle vertical frames and the trestle beam frames which are composed of assembly type steel structures are sequentially arranged above the pile foundations. And finally, Lassen steel plates are laid above the trestle beam frame to serve as a bridge floor of the trestle, and construction of the trestle is completed. The whole trestle is matched with the trestle frame of the assembly type steel structure through the pile foundations poured with concrete, the bearing capacity is high, the trestle is not prone to collapse or bending, the trestle is convenient to build, the building efficiency is high, and the field operation space can be increased. And in addition, after foundation pit construction is completed, the assembly type steel structure on the top layer can still be detached, reutilization of the steel structure frame can be achieved, and the construction cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of temporary operation platforms for foundation pits, in particular to an assembled Larsen steel plate trestle. Background Art

[0002] As the construction requirements of cities become higher and higher, basements are built deeper and deeper, basements are closer and closer to the red line, and the construction around the foundation pit is becoming more and more complicated. When building multi-story basements in such sites, the reasonable layout of earthwork ramps or temporary operating platforms is the key to project implementation. The "trestles" are often used, which are convenient for transportation and tailings excavation.

[0003] At present, temporary pier platforms in foundation pits are mainly constructed of reinforced concrete trestles and steel structure trestles. Reinforced concrete trestles are generally composed of steel columns, concrete beams and reinforced concrete slabs, while steel structure trestles are generally composed of steel columns, steel beams and box-type plates through assembled splicing.

[0004] Reinforced concrete trestles have a reinforced concrete structure with excellent quality and strength, and a higher bearing capacity. However, since reinforced concrete trestles require concrete pouring and maintenance, the construction time is relatively long and the construction efficiency is low. Moreover, most reinforced concrete trestles are built once and cannot be used again after dismantling. When dismantling the trestles later, more construction workers are required, and the labor intensity is high.

[0005] Although the assembled steel structure trestles are easy to build, have high construction efficiency, and can be disassembled, recycled and reused, their overall bearing capacity is not as good as that of reinforced concrete trestles. The steel structure at the bottom is prone to sinking or bending. Therefore, steel structure trestles not only have very high requirements on the quality and strength of steel, and their construction costs are relatively high compared to reinforced concrete trestles, but also require very precise welding and assembly during the manufacturing and construction process, and the construction process is relatively complicated. Utility Model Content

[0006] In order to improve the overall structure of a traditional temporary operation trestle in a foundation pit and increase the construction efficiency of the trestle, the present application provides an assembled Larsen steel plate trestle.

[0007] The present application provides an assembled Larsen steel plate trestle adopting the following technical solution:

[0008] An assembled Larsen steel plate trestle comprises a pile foundation, a trestle stand, a trestle bridge frame and a Larsen steel plate;

[0009] The pile foundation is buried in the foundation pit and formed by pouring concrete;

[0010] The trestle bridge frame is formed by evenly arranging a plurality of steel columns, one end of which is buried in the pile foundation, and the other end of which extends vertically upward to support the trestle bridge frame;

[0011] The trestle bridge frame includes a steel beam and a steel purlin. The steel beam is installed at the top of the steel column. The steel beam extends in the transverse direction of the steel column. The extension direction of the steel purlin is perpendicular to the extension direction of the steel beam. The steel purlin is horizontally arranged in sequence along the extension direction of the steel beam and can be detachably installed on the steel beam.

[0012] The extension direction of the Larsen steel plate is perpendicular to the extension direction of the steel purlin. The Larsen steel plates are horizontally arranged in sequence along the extension direction of the steel purlin and are installed on the steel purlin.

[0013] By adopting the above technical solution, since the overall trestle cooperates with the assembled steel structure trestle frame through the poured concrete pile foundation, the concrete pile foundation at the bottom of the trestle gives the trestle a higher bearing capacity, and it is not easy to collapse or bend due to excessive load-bearing. Moreover, as the foundation pit earthwork is excavated, the trestle is built from top to bottom in sequence. It is not only simple and convenient to build, but can also be quickly installed and dismantled on the foundation pit site, with high construction efficiency, which is conducive to shortening the construction period, and is also conducive to increasing the on-site working space, which can effectively reduce the safety hazards of high-altitude operations during the installation of the trestle. Secondly, the steel structure trestle frame has the advantages of being assembled and adjustable, so that the structural components such as the trestle stand, trestle bridge frame and Larsen steel plate can be reused many times, which is conducive to saving materials and reducing construction costs.

[0014] Optionally, the trestle frame is further provided with a plurality of groups of scissor struts, and the scissor struts are fixedly arranged between any two adjacent steel columns, and at least two groups of scissor struts are arranged between any two adjacent steel columns.

[0015] By adopting the above technical scheme, the scissors brace can play a supporting and reinforcing role on the pier frame structure, which is beneficial to improving the structural rigidity and lateral resistance of the pier frame. At the same time, the scissors brace can also limit the displacement and deformation of the pier frame in the horizontal direction, so that several steel columns form a whole, which is not only beneficial to improving the overall structural stability and coordination performance of the pier frame, but also beneficial to improving the bearing capacity of the pier frame.

[0016] Optionally, the minimum distance between two groups of scissor struts located between the same two steel columns and adjacent to each other is 0-500mm.

[0017] By adopting the above technical solution, when the minimum distance between two adjacent groups of scissors struts is controlled within the range of 0-500mm, the scissors struts can be more evenly dispersed and closed, which can reduce the local stress concentration of the steel columns caused by the scissors struts being too far apart, which is beneficial to reducing the risk of structural fatigue damage of the pier and giving full play to the stabilizing and reinforcing effect of the scissors struts on the pier frame structure.

[0018] Optionally, the trestle frame is further provided with a horizontal support, and the horizontal support is arranged along the horizontal direction, and the two ends of the horizontal support are respectively fixedly connected to any two of the steel columns that are diagonally opposite to each other.

[0019] By adopting the above technical scheme, the horizontal brace can enhance the stability of the pier frame in the horizontal direction, which is beneficial to improving the structural rigidity and lateral resistance of the pier frame. Moreover, the horizontal brace can also connect the diagonally located steel columns to each other, so that the pier frame forms a whole, which is beneficial to improving the overall structural stability and coordination performance of the pier frame.

[0020] Optionally, the trestle frame further includes an oblique brace, one end of the oblique brace is fixedly connected to the steel column, and the other end of the oblique brace extends obliquely upward and is fixedly connected to the steel purlin.

[0021] By adopting the above technical solution, the diagonal brace forms a triangular structure through the steel columns and steel purlins, and connects the pier frames and the pier bridge frames into a whole, which is beneficial to improving the overall structural stability and coordination of the pier. The diagonal brace can also distribute the load more evenly, reduce local stress concentration on the pier frames, reduce the risk of fatigue damage to the overall structure of the pier, and help improve the bearing capacity of the pier.

[0022] Optionally, a clamp is connected between the steel cross beam and the steel purlin, and the clamp is used to detachably connect the steel cross beam and the steel purlin.

[0023] By adopting the above technical solution, the steel beams and steel purlins are connected by using hoops. Not only is the connection method simple and convenient, and the construction efficiency is high, but it also has no direct impact on the steel beams and steel purlins. They can be directly disassembled later and the steel beams and steel purlins can be fully separated, which is conducive to the reuse of the steel beams and steel purlins.

[0024] Optionally, guardrails are provided on both side edges of the top of the trestle, and the guardrails are fixedly provided on the Larsen steel plate.

[0025] By adopting the above technical solution, construction workers can be effectively prevented from falling from the trestle into the foundation pit, which is beneficial to improving the safety performance of the trestle.

[0026] Optionally, welding positions are provided between the steel columns and the steel beams, and between the steel purlins and the Larsen steel plates, and they are connected by welding.

[0027] By adopting the above technical solution, the connection strength between the trestle uprights, the trestle bridge frames and the Larsen steel plates can be effectively improved, which is beneficial to improving the structural stability of the trestle.

[0028] In summary, the technical solution of this application has at least one of the following beneficial effects:

[0029] 1. Through the coordination between the poured concrete pile foundation and the assembled steel structure pier frame, the pier is not only easy to build and has high construction efficiency, but also the pier frames, pier bridge frames, Larsen steel plates and other structural components can be reused many times after the foundation pit construction is completed, which is conducive to saving materials and reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an assembled Larsen steel plate trestle in an embodiment of the present application.

[0031] Figure 2 It is a side view of an assembled Larsen steel plate trestle in an embodiment of the present application.

[0032] Figure 3 It is a top view of an assembled Larsen steel plate trestle in an embodiment of the present application, in which the Larsen steel plate is hidden.

[0033] Figure 4 It is an enlarged structural view of a trestle bridge frame of an assembled Larsen steel plate trestle in an embodiment of the present application.

[0034] Description of reference numerals:

[0035] 1. Pile foundation; 2. Pier frame; 21. Steel column; 22. Scissor brace; 23. Horizontal brace; 24. Diagonal brace; 3. Pier bridge frame; 31. Steel beam; 32. Steel purlin; 33. Hoop; 4. Larsen steel plate; 5. Guardrail. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-4 This application is described in further detail.

[0037] The present application embodiment discloses an assembled Larsen steel plate trestle. Figure 1 and Figure 2A prefabricated Larsen steel plate 4 trestle comprises a pile foundation 1, a trestle stand 2, a trestle bridge frame 3 and a Larsen steel plate 4, wherein the pile foundation 1 is buried in a foundation pit as the base of the trestle and is formed by pouring concrete, and the trestle stand 2 and the trestle bridge frame 3 composed of steel structures are sequentially built on the pile foundation 1, and finally the Larsen steel plate 4 is laid on the trestle bridge frame 3 to complete the construction of the trestle. The overall trestle cooperates with the pile foundation 1 poured with concrete and the prefabricated steel structure trestle frame, which not only enables the trestle to have a higher bearing capacity, but also prevents the bottom of the trestle from collapsing or bending due to the load bearing, and the trestle frame is built by the prefabricated steel structure, which is not only conducive to improving the construction efficiency of the trestle, but also has the characteristics of convenient construction and reusability of the steel structure trestle.

[0038] Reference Figure 1 and Figure 2 The trestle bridge frame 2 includes a plurality of steel columns 21 evenly arranged. In this embodiment, the steel columns 21 are H-shaped steels of model HW300×300. Specifically, one end of the steel column 21 is buried in the pile foundation 1 after a certain period of time of concrete pouring. The buried depth is not less than 1 / 3 of the overall length of the steel column 21. The specific buried depth needs to be calculated according to the actual construction situation. The other end of the steel column 21 extends vertically upward and is used to support the trestle bridge frame 3.

[0039] Reference Figure 1 , Figure 2 and Figure 3 In order to improve the bearing capacity of the trestle frame 2, the trestle frame 2 also includes a scissors brace 22, a horizontal brace 23 and a diagonal brace 24. The scissors brace 22 is fixedly arranged between any two adjacent steel columns 21, and at least two groups of scissors braces 22 are arranged between any two adjacent steel columns 21. The minimum distance between the two adjacent groups of scissors braces 22 is 0-500mm. In this embodiment, the minimum distance between the two adjacent groups of scissors braces 22 is 500mm. The horizontal brace 23 is arranged in the horizontal direction. Specifically, the two ends of the horizontal brace 23 are fixedly connected to the two diagonally located steel columns 21, and the connection point between the horizontal brace 23 and the steel column 21 is located between the two adjacent groups of scissors braces 22. One end of the diagonal brace 24 is fixedly connected to the steel column 21, and the other end extends obliquely upward and is fixedly connected to the trestle bridge frame 3.

[0040] Specifically, in this embodiment, the scissors brace 22, the horizontal brace 23 and the diagonal brace 24 are all made of H-shaped steel with a model of HN200×100, and the scissors brace 22 and the steel column 21, the horizontal brace 23 and the steel column 21, the diagonal brace 24 and the steel column 21, and the diagonal brace 24 and the pier bridge frame 3 are all connected by welding to improve the connection stability of the overall structure of the pier frame 2.

[0041] Reference Figure 3 and Figure 4 The trestle bridge frame 3 includes a steel beam 31 and a steel purlin 32, wherein in this embodiment, the steel beam 31 uses an H-shaped steel of model HW900×300, and the steel purlin 32 uses an H-shaped steel of model HM600×300. Specifically, the steel beam 31 is fixedly installed on the top of the steel column 21, the steel beam 31 extends along the transverse direction of the trestle, and is evenly arranged along the extension direction of the trestle, and the steel purlin 32 is detachably installed above the steel beam 31, the steel purlin 32 extends along the extension direction of the trestle, and is evenly arranged along the extension direction of the steel beam 31. Specifically, in this embodiment, the steel beam 31 and the steel purlin 32 are detachably connected to each other through a hoop 33, and in other embodiments, the steel beam 31 and the steel purlin 32 can be detachably connected by other connection methods such as bolts and steel bar bundling.

[0042] In order to further improve the connection stability between the pier upright frame 2 and the pier bridge frame 3, the steel column 21 is connected to the steel beam 31 by welding, and the end of the diagonal brace 24 away from the steel column 21 is welded to the steel purlin 32.

[0043] Reference Figure 1 The Larsen steel plate 4 extends horizontally along the transverse direction of the trestle, and is arranged and laid in sequence along the extension direction of the steel purlin 32 to form the bridge deck of the trestle. Specifically, the Larsen steel plate 4 is connected to the steel purlin 32 by welding. Guardrails 5 are also provided on the edges of both sides of the top of the trestle. Specifically, the guardrails 5 are fixed on the Larsen steel plate 4 by welding.

[0044] The implementation principle of an assembled Larsen steel plate 4 trestle in the embodiment of the present application is:

[0045] When it is necessary to build a temporary operation trestle in the foundation pit, firstly, a pile foundation 1 hole with a certain depth is dug out by an excavator, and concrete is poured into it. After a certain period of time, the steel column 21 is buried and installed. After the concrete is fully solidified, the trestle can be built.

[0046] Since it is a temporary operating trestle platform for the foundation pit, it is built from top to bottom. First, earthwork development is carried out according to the construction deployment. After reaching the depth of the upper assembly unit of the trestle, the steel beam 31 can be welded to the top of the steel column 21, and then the steel purlin 32 is installed on the steel beam 31 using the clamp 33, and the Larsen steel plate 4 and the guardrail are gradually installed to complete the installation of the upper platform.

[0047] As the depth of earth excavation increases, auxiliary supports such as scissor braces 22, horizontal braces 23 and diagonal braces 24 are gradually added to the steel columns 21 until the depth of the earth reaches the depth of the foundation pit, thus completing the construction of the temporary operating trestle for the foundation pit.

[0048] Since the overall trestle bridge cooperates with the assembled steel structure trestle frame through the poured concrete pile foundation 1, the concrete pile foundation 1 at the bottom of the trestle bridge gives the trestle bridge a higher bearing capacity, and it is not easy to collapse or bend due to load bearing. Moreover, as the foundation pit earthwork is excavated, the trestle bridge is built from top to bottom in sequence. It is not only simple and convenient to build, but can be quickly installed and dismantled on the foundation pit construction site, with high construction efficiency, which is conducive to shortening the construction period, and is also conducive to increasing the on-site working space, which can effectively reduce the safety hazards of high-altitude operations during the installation of the trestle bridge. Secondly, the steel structure trestle frame has the advantages of being assembled and adjustable, so that the structural components such as the trestle frame 2, the trestle bridge frame 3 and the Larsen steel plate 4 can be reused many times, which is conducive to saving materials and reducing construction costs.

[0049] The upper platform of the trestle is formed by sequentially building up the H-shaped steel and the Larsen steel plate 4, which is not only convenient to build and has high building efficiency, but also the trestle frame 2, the trestle bridge frame 3 and the Larsen steel plate 4 can be knocked off the welding positions one by one and disassembled after the foundation pit construction is completed, so as to realize the reuse of the steel structure frame.

[0050] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An assembled Larsen steel plate trestle, characterized in that: It comprises a pile foundation (1), a trestle stand (2), a trestle bridge frame (3) and a Larsen steel plate (4); The pile foundation (1) is buried in a foundation pit and formed by pouring concrete; The trestle bridge frame (2) is formed by a plurality of evenly arranged steel columns (21), one end of the steel column (21) is buried in the pile foundation (1), and the other end extends vertically upward and supports the trestle bridge frame (3); The trestle bridge frame (3) comprises a steel beam (31) and a steel purlin (32), wherein the steel beam (31) is mounted on the top of the steel column (21), the steel beam (31) extends in the transverse direction of the steel column (21), the extension direction of the steel purlin (32) is perpendicular to the extension direction of the steel beam (31), the steel purlin (32) is arranged horizontally in sequence along the extension direction of the steel beam (31), and can be detachably mounted on the steel beam (31); The extension direction of the Larsen steel plate (4) is perpendicular to the extension direction of the steel purlin (32); the Larsen steel plates (4) are arranged horizontally in sequence along the extension direction of the steel purlin (32) and are installed on the steel purlin (32).

2. The assembled Larsen steel plate trestle according to claim 1 is characterized in that: The trestle frame (2) is also provided with a plurality of groups of scissor struts (22), and the scissor struts (22) are fixedly arranged between any two adjacent steel columns (21), and at least two groups of scissor struts (22) are arranged between any two adjacent steel columns (21).

3. The assembled Larsen steel plate trestle according to claim 2 is characterized in that: The minimum distance between two adjacent groups of the scissor struts (22) located between the same two steel columns (21) is 0-500 mm.

4. The assembled Larsen steel plate trestle according to claim 1 is characterized in that: The trestle frame (2) is also provided with a horizontal support (23), and the horizontal support (23) is arranged along the horizontal direction. The two ends of the horizontal support (23) are respectively fixedly connected to any two of the steel columns (21) that are diagonally opposite to each other.

5. The assembled Larsen steel plate trestle according to claim 1 is characterized in that: The trestle frame (2) also includes an oblique brace (24), one end of which is fixedly connected to the steel column (21), and the other end of which extends obliquely upward and is fixedly connected to the steel purlin (32).

6. The assembled Larsen steel plate trestle according to claim 1, characterized in that: A clamp (33) is connected between the steel cross beam (31) and the steel purlin (32), and the clamp (33) is used to detachably connect the steel cross beam (31) and the steel purlin (32).

7. The assembled Larsen steel plate trestle according to claim 1 is characterized by: Guardrails (5) are also arranged at the edges of both sides of the top of the trestle, and the guardrails (5) are fixedly arranged on the Larsen steel plate (4).

8. The assembled Larsen steel plate trestle according to claim 1, characterized in that: Welding positions are provided between the steel columns (21) and the steel beams (31), and between the steel purlins (32) and the Larsen steel plates (4), and are connected by welding.

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