Portal frame and construction method

Abstract

The invention provides a portal frame and a construction method, and relates to the technical field of nuclear power station portal frames, the portal frame comprises a portal frame body, and a plurality of portal frame supporting legs are arranged on the lower end face of the portal frame body; the portal frame supporting leg comprises a supporting leg body, a plurality of crawling ladders are arranged on the supporting leg body, the crawling ladders are sequentially arranged from high to low, one or more working platforms are arranged on the supporting leg body, and the crawling ladders are arranged below the working platforms. According to the portal frame, the portal frame body is provided with the portal frame supporting legs, the crawling ladder and the working platform are arranged on the portal frame supporting legs, the crawling ladder and the working platform are installed on the portal frame supporting legs and then are hoisted, the erecting work of a scaffold can be reduced, and then the overall construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant gantries, in particular to a gantry and a construction method. Background Art

[0002] Gantry installation is a crucial step in nuclear power plant construction, serving as a critical component for transporting equipment into the reactor building. It consists of four outriggers, six tension beams, two main beams, two end beams, an electric hoist, and a trolley. The current installation method involves first positioning the outriggers and then installing the tension beams. However, since installing the tension beams requires scaffolding, this not only increases the main construction period but also increases the risks of working at height. Summary of the Invention

[0003] The purpose of the present invention is to provide a gantry frame and a construction method to alleviate the technical problem that the current gantry frame installation requires the setting up of scaffolding, which affects the progress of the construction team.

[0004] The present invention provides a gantry, comprising a gantry main body, wherein a plurality of gantry legs are provided on the lower end surface of the gantry main body;

[0005] The gantry leg includes a leg body, on which a plurality of ladders are arranged in sequence from high to low. One or more working platforms are arranged on the leg body, and the ladder is arranged below each working platform.

[0006] In an optional embodiment, the working platform includes a working platform body, the working platform body is provided with a first assembly hole, and the leg body is inserted into the first assembly hole;

[0007] A first railing is provided on the peripheral side of the working platform body, and a first oblique support is provided on the lower end surface of the working platform body, one end of the first oblique support is connected to the lower end surface of the working platform body, and the other end is connected to the support leg body.

[0008] In an optional embodiment, a first manhole is provided on the working platform body, and the ladder is provided at the lower end of the first manhole.

[0009] In an optional embodiment, a resting platform is provided on the support leg body, and the resting platform is provided between two adjacent ladders.

[0010] In an optional embodiment, the rest platform is provided with a second manhole, and a second railing is provided on the rest platform, and the second railing and the support leg body form a safe rest area.

[0011] In an optional embodiment, a second oblique support is provided at the lower end of the rest platform, and one end of the second oblique support is connected to the lower end surface of the rest platform, and the other end is connected to the support leg body.

[0012] In an optional embodiment, a guardrail is provided on the ladder.

[0013] In an optional embodiment, a working platform, a resting platform, a working platform and a resting platform are sequentially provided on the support leg body from top to bottom.

[0014] In an optional embodiment, four gantry legs are provided at the lower end of the gantry body.

[0015] The present invention provides a gantry with a gantry body provided with a plurality of gantry legs, and the gantry legs are provided with ladders and working platforms. By installing the ladders and working platforms on the gantry legs and then hoisting them, the scaffolding erection work can be reduced, thereby accelerating the overall construction efficiency.

[0016] The present invention provides a construction method of a gantry, and the construction steps are as follows:

[0017] S1. Production of working platforms, ladders and rest platforms;

[0018] S2. Transport the working platform, ladder and rest platform to the construction site and install them on the gantry legs;

[0019] S3. Lifting of gantry legs and main body.

[0020] The working platform, ladder and rest platform of the gantry construction method provided by the present invention are all produced in the factory, and then the produced working platform, ladder and rest platform are transported to the construction site, and then the working platform, ladder and rest platform are connected to the gantry legs, and then the gantry legs are installed, which can reduce the construction of scaffolding and improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of a gantry provided in an embodiment of the present invention;

[0023] Figure 2A schematic structural diagram of the gantry provided by an embodiment of the present invention from another angle;

[0024] Figure 3 for Figure 1 A schematic structural diagram of the gantry legs of the gantry shown;

[0025] Figure 4 for Figure 3 The schematic diagram of the structure of the ladder of the gantry legs shown;

[0026] Figure 5 for Figure 3 The schematic diagram of the structure of the working platform of the gantry legs is shown;

[0027] Figure 6 for Figure 3 A schematic structural diagram of the rest platform of the gantry legs shown;

[0028] Figure 7 A schematic diagram of a gantry construction method provided in an embodiment of the present invention.

[0029] Icons: 100-gantry support legs; 200-ladder; 201-guardrail; 300-working platform; 301-working platform body; 302-first railing; 303-first assembly hole; 304-first manhole; 305-first inclined support; 400-resting platform; 401-second railing; 402-second manhole; 403-second inclined support; 500-gantry body. DETAILED DESCRIPTION

[0030] The terms "first", "second", "third", etc. are only used to distinguish and describe, and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0031] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0032] In the description of this application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0033] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "install", "connected" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the internal parts of two elements.

[0034] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings.

[0035] Example

[0036] Reference Figures 1-6 The present invention provides a gantry, comprising a gantry body 500, wherein a plurality of gantry legs 100 are provided on the lower end surface of the gantry body 500;

[0037] The gantry leg 100 includes a leg body, on which a plurality of ladders 200 are arranged in sequence from high to low. One or more working platforms 300 are arranged on the leg body, and a ladder 200 is arranged under each working platform 300.

[0038] In some embodiments, a plurality of gantry legs 100 are provided on the lower end surface of the gantry body 500 , and each gantry is provided with a ladder 200 ; a working platform 300 is also provided on the leg body, and workers can move to the working platform 300 by climbing the ladder 200 .

[0039] Moreover, the working platform 300 and the ladder 200 can be prefabricated. After the prefabricated working platform 300 and the ladder 200 are transported to the construction site, they are connected to the support leg body, thereby realizing the installation of the working platform 300 and the ladder 200 on the ground with the support leg body; in this way, after the gantry support leg 100 is hoisted, the need for setting up scaffolding is reduced, thereby improving construction efficiency.

[0040] Reference Figure 5 In an optional embodiment, the working platform 300 includes a working platform body 301, the working platform body 301 is provided with a first assembly hole 303, and the leg body is inserted into the first assembly hole 303;

[0041] A first railing 302 is provided on the peripheral side of the working platform body 301, and a first oblique support 305 is provided on the lower end surface of the working platform body 301. One end of the first oblique support 305 is connected to the lower end surface of the working platform body 301, and the other end is connected to the support leg body.

[0042] In some embodiments, a first assembly hole 303 is provided on the working platform body 301 of the working platform 300. The first assembly hole 303 is used to connect with the support leg body, thereby realizing the installation of the working platform body 301 on the support leg body.

[0043] A first railing 302 is provided on the work platform body 301 , and the first railing 302 is provided along the peripheral side of the work platform body 301 , so that the first railing 302 forms a safety area on the work platform body 301 , making it difficult for workers to fall off the work platform body 301 .

[0044] In order to make the working platform body 301 more secure, a plurality of first inclined supports 305 are provided at the lower end of the working platform body 301. One end of the first inclined support 305 is connected to the working platform body 301, and the other end is connected to the support leg body, thereby ensuring that the working platform body 301 is firmly fixed on the support leg body.

[0045] The first oblique support 305 can be connected to the working platform body 301 and the supporting leg body in a detachable manner, or the first oblique support 305 can be connected to the working platform body 301 and the supporting leg body respectively by welding.

[0046] The gantry leg 100 ladder 200 platform device is composed of a ladder 200, a rest platform 400, and a working platform 300 on each gantry leg 100. The ladder 200 mainly connects the rest platform 400 and the working platform 300, and construction personnel can climb to the rest platform 400 and the working platform 300 through the ladder 200.

[0047] In an optional embodiment, a first manhole 304 is provided on the working platform body 301 , and the ladder 200 is provided at the lower end of the first manhole 304 .

[0048] In order to enable workers below the work platform body 301 to move to the top of the work platform body 301 , a first manhole 304 is provided on the work platform body 301 . The first manhole 304 facilitates construction workers to move up and down on the work platform body 301 .

[0049] Among them, the ladder 200 at the upper end of the working platform body 301 and the ladder 200 at the lower end of the working platform body 301 are arranged alternately; after the construction personnel enter the working platform body 301 from the first manhole 304, they can move a distance on the working platform body 301 and then enter the ladder 200 at the upper end of the working platform body 301.

[0050] Reference Figure 6In an optional embodiment, a resting platform 400 is provided on the support leg body, and the resting platform 400 is provided between two adjacent ladders 200.

[0051] In an optional embodiment, the resting platform 400 is provided with a second manhole 402, and a second railing 401 is provided on the resting platform 400, and the second railing 401 and the supporting leg body form a safe resting area.

[0052] Reference Figure 4 In an optional embodiment, a second oblique support 403 is provided at the lower end of the rest platform 400, and one end of the second oblique support 403 is connected to the lower end surface of the rest platform 400, and the other end is connected to the leg body.

[0053] In an optional embodiment, a guardrail 201 is provided on the ladder 200 .

[0054] In some embodiments, due to the high height of the support leg body, after the workers climb up a certain distance through the ladder 200, they will consume their physical strength, which will affect the safety of the workers; a rest platform 400 is set between the two ladders 200; when the construction workers climb up a certain distance, they climb to the rest platform 400 and can rest and restore their physical strength on the rest platform 400; this helps to improve the safety of the subsequent climbing.

[0055] In order to make the workers safer on the rest platform 400, a second railing 401 is provided on the rest platform 400. The second railing 401 cooperates with the support leg body to form a safe rest area.

[0056] Reference Figure 3 In an optional embodiment, a working platform 300, a resting platform 400, a working platform 300 and a resting platform 400 are sequentially provided on the support leg body from top to bottom.

[0057] In an optional embodiment, four gantry legs 100 are provided at the lower end of the gantry body 500 .

[0058] In some embodiments, a plurality of gantry legs 100 are provided on the lower end surface of the gantry body 500, and generally four gantry legs 100 are provided at the lower end of the gantry body 500; a plurality of ladders 200 are provided on the gantry legs 100, and a working platform 300 or a resting platform 400 is provided between two adjacent ladders 200; the resting platform 400 and the working platform 300 are provided in sequence from bottom to top; and the resting platform 400 and the working platform 300 are provided alternately, with the lower end being the resting platform 400 and the upper end being the working platform 300.

[0059] The present invention provides a gantry frame having a gantry body 500 on which a plurality of gantry legs 100 are provided, and a ladder 200 and a working platform 300 are provided on the gantry legs 100. By installing the ladder 200 and the working platform 300 on the gantry legs 100 and then hoisting them, the scaffolding erection work can be reduced, thereby accelerating the overall construction efficiency.

[0060] Reference Figure 7 The present invention provides a construction method of a gantry, and the construction steps are as follows:

[0061] S1, production of working platform 300, ladder 200 and rest platform 400;

[0062] S2, transporting the working platform 300, the ladder 200 and the resting platform 400 to the construction site and installing them on the gantry legs 100;

[0063] S3. Lift the gantry legs 100 and the gantry body 500.

[0064] In some embodiments, the working platform 300, the ladder 200 and the resting platform 400 are all prefabricated in a factory. The prefabricated working platform 300, the ladder 200 and the resting platform 400 are transported to the construction site, and then the working platform 300, the ladder 200 and the resting platform 400 are assembled on the support leg body, and then hoisted onto the gantry support leg 100; then the gantry body 500 is hoisted onto the gantry support leg 100.

[0065] Use a lifting machine to flip the gantry leg 100 to the predetermined position, while paying attention to the hoisting balance to avoid shaking or collision. After the flip is completed, perform the overall hoisting operation to accurately install the gantry leg 100 in its predetermined position.

[0066] The gantry installation process is more efficient and safer; the ladder 200 platform on the main leg provides convenience and support for workers, making the tension beam installation process smoother. This parallel installation method can significantly shorten the gantry installation time and reduce construction risks.

[0067] The construction method of the gantry is to realize the ground installation of the working platform 300, the ladder 200 and the rest platform 400 through redesign, processing and cutting, and on-site assembly, and this construction method does not occupy the main line construction period.

[0068] The gantry construction method optimizes the construction process and completes the installation of the working platform 300, ladder 200 and rest platform 400 on the ground, reducing the need for high-altitude operations and scaffolding erection, improving construction quality and efficiency, and reducing construction safety risks.

[0069] During the gantry installation phase, after the four gantry legs 100 are flipped and upright, the next step, installing the tension beam, main beam, and end beams, can proceed directly without waiting for scaffolding to be erected. When assembling and installing components such as the tension beam and end beams, on-site construction workers, protected by safety belts and fall arresters, use a ladder 200 platform to reach the component connection locations, assemble the connecting components, and torque-tighten bolts. After the main and end beams are installed, construction workers can simultaneously ascend the ladders 200 on the four gantry legs 100 to install other components, such as the overhead trolley and rain cover, eliminating the need for scaffolding and accelerating construction progress.

[0070] The working platform 300, ladder 200 and rest platform 400 are all installed by on-site welding. The welding method of the ladder 200, working platform 300, rest platform 400 and main beam is fillet weld, and the weld leg size is not less than 5mm, and a 100% VT inspection is carried out after welding; the welding method of the working platform 300 and the support legs, main beam and other accessories is fillet weld, and the weld leg size is not less than 5mm, and the on-site welds are all full welds, and a 100% VT inspection is carried out after welding.

[0071] During on-site installation, platform components such as connecting plates and channel steel can be cut and processed on-site according to actual conditions to ensure the installation of the ladder 200 platform. To facilitate the transportation of the outriggers, some components of the construction platform need to be assembled at the on-site lifting points. Before assembly, the outriggers need to be raised in the same way as the main beams.

[0072] The outrigger body can also be transported to the site in advance and turned over on site, and then welding work of the ladder 200 and the working platform 300 can be carried out on site.

[0073] The working platform 300, ladder 200 and rest platform 400 of the gantry construction method provided by the present invention are all produced in a factory, and then the produced working platform 300, ladder 200 and rest platform 400 are transported to the construction site, and then the working platform 300, ladder 200 and rest platform 400 are connected to the gantry legs 100, and then the gantry legs 100 are installed, which can reduce the construction of scaffolding and improve construction efficiency.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gantry, characterized in that: It comprises a gantry main body (500), wherein a plurality of gantry legs (100) are provided on the lower end surface of the gantry main body (500); The gantry support leg (100) comprises a support leg body, a plurality of ladders (200) are arranged on the support leg body, and the plurality of ladders (200) are arranged in order from high to low. One or more working platforms (300) are provided on the supporting leg body, and the ladder (200) is provided below each of the working platforms (300).

2. The gantry according to claim 1, characterized in that: The working platform (300) comprises a working platform body (301), a first assembly hole (303) is provided on the working platform body (301), and the supporting leg body is inserted into the first assembly hole (303); A first railing (302) is provided on the peripheral side of the working platform body (301), and a first oblique support (305) is provided on the lower end surface of the working platform body (301), one end of the first oblique support (305) is connected to the lower end surface of the working platform body (301), and the other end is connected to the support leg body.

3. The gantry according to claim 2, characterized in that: A first manhole (304) is provided on the working platform body (301), and the ladder (200) is provided at the lower end of the first manhole (304).

4. The gantry according to claim 1, characterized in that: A resting platform (400) is provided on the supporting leg body, and the resting platform (400) is provided between two adjacent ladders (200).

5. The gantry according to claim 4, characterized in that: The resting platform (400) is provided with a second manhole (402), and a second railing (401) is provided on the resting platform (400), and the second railing (401) and the supporting leg body form a safe rest area.

6. The gantry according to claim 4, characterized in that: A second oblique support (403) is provided at the lower end of the rest platform (400), and one end of the second oblique support (403) is connected to the lower end surface of the rest platform (400), and the other end is connected to the support leg body.

7. The gantry according to claim 1, characterized in that: The ladder (200) is provided with a guardrail (201).

8. The gantry according to claim 4, characterized in that: A working platform (300), a resting platform (400), a working platform (300) and a resting platform (400) are sequentially arranged on the supporting leg body from top to bottom.

9. The gantry according to claim 1, characterized in that: Four gantry legs (100) are provided at the lower end of the gantry body (500).

10. A construction method for a gantry, characterized in that: The construction steps are as follows: the construction method comprises the following steps: S1, production of working platform (300), climbing ladder (200) and rest platform (400); S2, transporting the working platform (300), the ladder (200) and the resting platform (400) to the construction site and installing them on the gantry legs (100); S3, gantry legs (100) are hoisted, and gantry body (500) is hoisted.

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