CN111502304A - Construction method for hoisting arched net rack - Google Patents

Abstract

A construction method for hoisting an arched grid frame, comprising the following steps: dividing a whole-span grid frame structure into a module 1 located in the middle and two left-right symmetrical modules; The attached hanging ladders are arranged from bottom to top at the point position, and the hanging ladders are arranged in sections; use a chain hoist at the bottom of each hoisting wire rope or the bottom of the belt to connect with the components of module 1 and module 2; , the construction personnel use the attached hanging ladder to climb to the vicinity of the hoisting point of the grid frame, and use the chain hoist to unload the entire grid frame; After the racking does not occur anymore, the bolt balls connected to the grid are finally screwed to complete the hoisting. The invention adopts the attached hanging ladder to complete the installation when the components are assembled on the ground, which greatly reduces the risk of high-altitude hoisting operations, improves labor efficiency, and saves construction period and construction cost.

Description

A construction method for hoisting an arched grid

technical field

The invention relates to a hoisting construction method for an arched grid frame, which belongs to a grid frame type steel structure installation and construction method.

Background technique

The raw material additive and conditioner storage silos in the cement plant are two long-strip arched grid storage silos. The additive storage silos mainly store cement raw materials gypsum, limestone and pozzolan, and the conditioner storage silos mainly store cement raw materials iron sandstone, sand and volcanic ash. The silo for chips, additives and conditioners each have a storage capacity of 30,000 tons and consist of 6 stockpiles of 5,000 tons each.

The additive storage silo has a length of 330m, a span of 49.2m and a height of 20m; the regulator storage silo has a length of 260m, a span of 49.2m and a height of 20m; the structure of the storage silo is a three-dimensional spherical grid structure, and the components are connected by bolt balls. It is special-shaped and difficult to hoist.

SUMMARY OF THE INVENTION

In order to solve the problem that the grid structure is special-shaped and the hoisting is difficult, the embodiment of the present invention provides a hoisting construction method for an arch grid.

For this purpose, the embodiments of the present invention provide the following technical solutions:

A construction method for hoisting an arched grid frame, comprising the following steps:

(1): Divide the whole-span grid structure into three parts, including module one in the middle and two left-right symmetrical modules;

(2): Module 1 and Module 2 are assembled on the ground. When the assembly is completed, according to the setting of the hoisting points of Module 1 and Module 2, the attached hanging ladder is arranged from bottom to top along the position of the hanging point, and the hanging ladder is segmented. set up;

(3): Module 1 and Module 2 are respectively hoisted by multiple machines, and a chain hoist is used at the bottom of each hoisting wire rope or belt hoist to connect with the components of Module 1 and Module 2;

(4): After the entire span of the arched grid is hoisted into place, the construction workers use the pre-set attachment ladder to safely and quickly climb to the vicinity of the hoisting point of the grid, and use the chain hoist to hoist the entire span of the grid. Unloading: During the unloading process, the ground surveyors use a level and a lifting ruler to monitor the lowering degree of the grid frame during the unloading process. After the grid frame's lowering is no longer occurring, the bolt balls connected to the grid frame are finally screwed to complete the hoisting.

Further, in step (4), the hanging ruler is suspended from the upper part of the grid frame.

Further, the span of the attached hanging ladder is 3 meters, and the fixation between the attached hanging ladder and the grid is fixed by stainless steel cable ties.

Further, the width of the cable ties is 20mm, and there are 20 groups in total.

Further, the attached hanging ladder on the second module consists of 5 sections.

Further, the upper end of the second module is lifted and hoisted by 6 chain hoists.

Compared with the prior art, the beneficial effects and significant progress of the present invention are:

The embodiment of the present invention fully considers the safety, operability and economy of high-altitude operation of the grid structure, and the attached hanging ladder is installed as a complete set when the components are assembled on the ground, which greatly reduces the risk of high-altitude hoisting operations and improves labor efficiency. , saving the construction period and construction cost. Compared with other construction methods to solve this problem, it has less investment, convenient operation, safety and reliability, and strong applicability.

Description of drawings

In order to illustrate the technical solutions of the present invention more clearly, the following briefly introduces the accompanying drawings required for the embodiments of the present invention.

Obviously, the drawings in the following description are only drawings of some embodiments of the present invention. For those of ordinary skill in the art, without creative effort, other drawings can also be obtained from these drawings. The accompanying drawings, but these other drawings also belong to the drawings required to be used in the embodiments of the present invention.

Fig. 1 is a schematic diagram of a segmented structure of a whole span grid structure according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the arrangement of the second whole-span grid frame module and the attached hanging ladder according to the embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions, beneficial effects and significant progress of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings provided in the embodiments of the present invention.

Obviously, all the described embodiments are only part of the embodiments of the present invention, not all of the embodiments; based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative efforts For example, all belong to the protection scope of the present invention.

It should be noted that the terms "first", "second" and "third" (if any) in the description and claims of the present invention and the drawings of the embodiments of the present invention are only used to distinguish different objects, rather than describing a specific order. Furthermore, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or elements is not limited to the listed steps or elements, but optionally also includes unlisted steps or elements, or optionally also Include other steps or units inherent to these processes, methods, products or devices.

What needs to be understood is:

In the description of the embodiments of the present invention, the terms "upper", "bottom", "top", "bottom" and other indicative orientation or positional terms are only based on the orientation or positional relationship shown in the accompanying drawings of the embodiments of the present invention , is for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying the specific orientation, specific orientation configuration and operation that the described device or element must have, therefore, it should not be construed as a limitation of the present invention.

In the present invention, unless otherwise expressly specified and limited, the terms "installation", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection or an active connection, It can also be integrated; it can be a direct connection, an indirect connection through an intermediate medium, an invisible signal connection, or even an optical connection, and it can be the internal communication of two elements or the interaction between the two elements, unless otherwise There are clear limits.

For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

It should also be noted that the following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

Hereinafter, the technical solutions of the present invention will be described in detail with specific embodiments.

In order to solve the problem of hoisting the grid structure with special-shaped bolt ball connection, various conditions such as construction drawings, 3D model drawings, the number and weight of components, and the structural form of the arched grid were carefully studied in the early stage, and the arched grid structure was formulated. Modular assembly on the ground, multi-machine lifting and hoisting of the whole-span grid frame, and one-time docking at high altitude are used for construction organization.

In order to ensure the successful implementation of the high-altitude one-time docking of the whole-span grid frame modular multi-machine lifting, on each modularly assembled grid structure, along the position of the lifting point, an attached hanging ladder is set down for the After the grid structure is hoisted in place, the operator can safely and quickly reach the hoisting point of the grid from the ground, and use the chain hoist to slowly unload the components and loosen the hook after the unloading is completed.

as the picture shows:

A construction method for hoisting an arched grid frame, comprising the following steps:

The whole-span grid structure is divided into three parts, including module 1 in the middle and two symmetrical modules 2; comprehensively consider the construction site conditions on site, the weight of the whole-span grid, the stability of structural hoisting, construction Based on a series of factors such as the performance of the existing cranes on site, a two-axis and whole-span grid structure is formulated as a whole, and it is assembled into three pieces of ground modularly. Three cranes are used to lift multiple machines as a whole. .

(2): Module one 1 and module two 2 are assembled on the ground. After the assembly is completed, according to the setting of the hoisting point of module one and module two, the attached hanging ladder 3 is arranged from bottom to top along the position of the hanging point. The ladders are set in sections; the attached hanging ladders are arranged at the same time as the components when the arched grid is assembled on the ground. The principle of arrangement is to arrange straight lines from bottom to top along the hoisting point or both sides of the hoisting point.

(3): Module one 1 and module two 2 carry out multi-machine lifting respectively, and use chain hoist 5 at the bottom of each hoisting wire rope 4 or the bottom of the belt to connect with the components of module one 1 and module two 2;

(4): After the entire span of the arched grid is hoisted in place, the construction workers use the pre-set attachment ladder 3 to safely and quickly climb to the hoisting point of the grid, and use 5 chain hoists to pair the entire span of the grid. During the unloading process, the ground surveyors use a level and a hoisting ruler to monitor the lowering degree of the grid during the unloading process. Hoisting.

In addition to facilitating the quick unloading of the construction personnel, the chain hoist also plays the following functions: when the hoisting is in place, the hoisting angle of the arched grid can be adjusted accurately, ensuring that the three modularly assembled grids can be successfully connected at one time at high altitude. , reduce the adjustment time of high-altitude positioning and ensure safety.

Further, in step (4), the hanging ruler is suspended from the upper part of the grid frame.

Further, the span of the attached hanging ladder is 3 meters, and the fixing between the attached hanging ladder and the grid is fixed by stainless steel cable ties 6, which is convenient, fast and reusable.

Further, the width of the cable ties is 20mm, and there are 20 groups in total.

Further, the attached hanging ladder on the second module consists of 5 sections.

Further, the upper end of the second module is lifted and hoisted by 6 chain hoists.

In the construction method of modular assembly on the ground of the arch-shaped grid frame and lifting and hoisting by multiple machines across the entire span, the attached hanging ladder can solve the problem of safety passages for the operators to get up and down during the high-altitude hoisting process, and ensure that the construction workers are in the safe passage. Safely and quickly reach the 20-meter-high grid frame in a short time for angle adjustment before the modular grid frame is in place, initial bolting of high-strength connecting bolt balls, safe and slow unloading of grid structure, final bolt tightening, etc. It provides a relatively valuable construction method for the construction of all large-span grid structures in the future. This method is suitable for various high-height, large-span grid structures and steel structure hoisting construction of high-altitude frame structures.

The invention is successfully applied in the steel structure hoisting construction of super-high frame structures such as raw material additives and regulator storage bins and preheating towers in the Saudi YAMAMA cement plant project.

During the description of the above specification:

The description of the terms "this embodiment", "this embodiment of the present invention", "as shown", "further", "further improved technical sub-scheme", etc., mean the specific features described in this embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention; in this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example, and the specific features, structures, Materials or features, etc. may be combined or combined in any suitable manner in any one or more embodiments or examples; furthermore, under the premise of no contradiction, those of ordinary skill in the art may combine the different embodiments described in this specification or examples and features of different embodiments or examples are combined or combined.

Finally, it should be noted that:

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them;

Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced. , and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and the non-essential improvements, adjustments or replacements made by those skilled in the art according to the contents of this specification belong to the present invention. Scope of Claimed Protection.

Claims (6)

1. The hoisting construction method of the arch net rack is characterized by comprising the following steps:

(1): the whole span net rack structure is divided into three parts, including a first module positioned in the middle and two bilaterally symmetrical second modules;

(2): the first module and the second module are assembled on the ground, and after the assembly is finished, the attached hanging ladder is arranged along the hanging points from bottom to top according to the arrangement of the hanging points of the first module and the second module, and the hanging ladder is arranged in sections;

(3): the first module and the second module are respectively lifted by multiple machines, and the bottom of each lifting steel wire rope or belt crane is connected with the components of the first module and the second module by a chain block;

(4): after the whole span of the arched net rack is hoisted in place, construction operators safely and quickly climb to the position near the hoisting point of the net rack by using a preset attached hanging ladder and unload the whole span net rack by using a chain block; the unloading in-process ground survey personnel use the spirit level and hang the chi and monitor the net rack unloading in-process degree of winding down, wait that net rack winding down no longer takes place the back, twist the bolt ball that the net rack is connected finally, accomplish the hoist and mount.

2. The hoisting construction method for the arched net rack according to claim 1, characterized in that:

in step (4), the hanging ruler is hung from the upper part of the net rack.

3. The hoisting construction method for the arched net rack according to claim 1, characterized in that: the ladder span is hung to the attached type for 3 meters, and the fixed stainless steel ribbon that adopts between ladder and the rack is hung to the attached type.

4. The hoisting construction method for the arched net rack according to claim 3, characterized in that: the width of the ribbon is 20mm, and 20 groups are provided.

5. The hoisting construction method for the arched net rack according to claim 1, characterized in that: the attached hanging ladder on the second module consists of 5 sections.

6. The arch net rack hoisting construction method as claimed in claim 5, wherein: the upper end of the second module is lifted by 6 chain blocks.

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