Construction method for comprehensive unloading of hoisting equipment during lifting of concrete floor

Abstract

This invention relates to the field of building construction technology, specifically a comprehensive unloading construction method for lifting equipment in concrete floor conditions. The method includes the following steps: dividing the construction area into sections and rationally defining the component lifting area; calculating the working conditions of the mobile crane; designing parameters for the mobile crane's concentrated load transfer device and calculating its strength and stability under stress; and generating technical drawings and handover documents. The beneficial effects are: the comprehensive unloading construction method for lifting equipment in concrete floor conditions proposed in this invention innovatively develops a concentrated load dispersion device. Based on stress and deflection deformation calculations, it guides the on-site work by using the idea of ​​transferring and dispersing concentrated loads, avoiding large-area floor slab backfilling. It also combines the rational crane travel route and lifting point diagram with the civil engineering zero-level beam and slab distribution, and rationally and scientifically calculates the floor slab stress.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a comprehensive unloading construction method for hoisting equipment on concrete floors. Background Technology

[0002] Large-scale conference and exhibition projects often feature curved shapes, and the structures above ground level (±0) are generally composed of large-scale steel structures. Depending on the function, the above-ground steel structure consists of trusses, steel beams, and floor slabs. Construction of above-ground components must consider placing large mobile cranes on the ±0 floor slab for lifting. Placing mobile lifting equipment on the floor slab may lead to a series of problems, such as insufficient load-bearing capacity of the floor slab itself causing damage, and damage to the underlying beams and columns due to concentrated loads. This not only damages the existing structure but also poses a significant risk to its future use.

[0003] In existing technology, the load-bearing capacity of the basement floor slab is verified by the design institute, and then a support frame is erected under the floor slab to reinforce and back the structure as needed to meet the requirements of placing mobile lifting equipment on the floor slab for hoisting.

[0004] However, the above method has the following problems: 1) Large conference and exhibition projects have a large single-story area, and the basement is generally multi-story, requiring the construction of scaffolding for the roof layer, which requires a lot of scaffolding and formwork; 2) The construction of scaffolding for the roof layer in the basement occupies limited construction space, which affects and restricts the subsequent construction of each process in the basement and delays the smooth progress of the project; 3) The increase in scaffolding and the delay in the construction period result in a significant increase in construction measures costs. Summary of the Invention

[0005] The purpose of this invention is to provide a comprehensive unloading construction method for lifting equipment in concrete floor conditions, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a comprehensive unloading construction method for hoisting equipment on a concrete floor, the comprehensive unloading construction method comprising the following steps:

[0007] Construction zones were divided, and component hoisting areas were rationally designated.

[0008] Mobile crane operating condition calculation;

[0009] Design parameters for the concentrated load transfer device of the mobile truck crane and calculate its strength and stability under stress.

[0010] Technical drawings and handover documents were prepared.

[0011] Preferably, for the construction section division, the reasonable division of the component hoisting area specifically includes: reasonably segmenting the components, determining the crane parameters according to the technical parameters of the components, clarifying the floor walking route, and calculating whether the structure of the crane's non-working state walking route is safe.

[0012] Preferably, when dividing the construction section and reasonably dividing the component hoisting area, segment according to the single structure form and divide different regional construction sections; determine the walking routes of the construction crane and component transport vehicles according to the construction section; determine the technical parameters of the mobile truck crane according to the hoisting process, calculate whether the floor load within the walking route range of the mobile truck crane meets the requirements, perform modeling calculations using finite element software, and analyze in combination with the design drawings according to the results; perform structural load验算 on the planned truck walking route.

[0013] Preferably, the calculation of the mobile truck crane working conditions includes: determining the crane's standing position during hoisting, calculating the most unfavorable working condition analysis for each crane standing position, and calculating the force on the crane's outriggers.

[0014] Preferably, designing the parameters of the mobile truck crane concentrated load transfer device and calculating the strength and stability under the stress state includes: reviewing whether the floor bearing capacity meets the requirements, innovating a reasonable dispersion device for the force on the crane's outriggers when it does not meet the requirements, determining the parameters of the concentrated load dispersion device, calculating the strength and stability of the distribution device, and analyzing the structure stress after adopting the force distribution device.

[0015] Preferably, when forming the technical drawings and disclosure documents, form the walking route of the large mobile truck crane and the standing position diagram under the mobile crane working conditions, and form technical documents for disclosure, which also serve as the basis for safety acceptance.

[0016] Preferably, the concentrated load transfer device includes a box-shaped column. A base plate is provided at the bottom of the box-shaped column. Two groups of support plates are provided on the surface of the base plate. The two groups of support plates clamp the box-shaped column. A clamping component is provided on the surface of the support plate, and a blocking pusher is provided on the surface of the support plate. By拨动 the blocking pusher, the clamping component is limited. The clamping component clamps the box-shaped column and is used to connect the box-shaped column and the support plate.

[0017] Preferably, an inclined surface is provided on the top surface of the support plate close to the box-shaped column. An embedding groove is jointly opened on the surfaces of the support plate and the base plate. The embedding groove is a "匚"-shaped groove. A rubber base plate is fixed inside the embedding groove. The rubber base plate is a "匚"-shaped strip. The rubber base plate is clamped between the box-shaped column, the base plate and the support plate and is used to damp the support plate.

[0018] Preferably, the clamping component includes a through-hole, a clamping block, a connecting groove, a rubber traction belt, and a sliding groove. The sliding groove is a "U"-shaped groove and is opened on the surface of the support plate. The through-hole is opened on the surface of the sliding groove. The clamping block is movably inserted into the through-hole. A rubber sheet is fixed at one end of the clamping block. An inclined surface is provided at the other end of the clamping block, and a connecting groove is opened at the other end of the clamping block. The middle of the rubber traction belt is fixed on the surface of the connecting groove, and the two ends of the rubber traction belt are respectively fixed on two relatively distributed side walls of the through-hole.

[0019] Preferably, the blocking and pushing member includes a column, a through-hole, a lifting baffle, a picking groove, and rubber clamping strips. The lifting baffle is a "U"-shaped plate structure. Through-holes are opened on both parallel side plates of the lifting baffle. The column passes through the through-hole and is fixed on the surface of the sliding groove. The picking groove is opened on the surface of the lifting baffle. There are multiple rubber clamping strips, and all the rubber clamping strips are fixed on the surface of the sliding groove. By拨动 the lifting baffle to squeeze the clamping block, the rubber clamping strips are clamped between the lifting baffle and the sliding groove.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The lifting equipment proposed by the present invention innovatively researches and develops a concentrated load dispersion device in the comprehensive unloading construction method during the hoisting of the concrete floor condition. Guided by the stress and deflection deformation calculated by the force analysis, using the idea of transferring and dispersing the concentrated load, it avoids the situation of large-area floor back-propping. Combined with the reasonable crane walking route and lifting point diagram of the civil engineering plus / minus zero beam slab division, and reasonably and scientifically calculates the floor stress situation; it is convenient for construction, saves costs, and eliminates the costs of the full hall scaffolding reinforcement measures for the negative first and second floors; it speeds up the construction period. When there is no full hall scaffolding reinforcement in the basement, it is beneficial for the subsequent processes such as the secondary structure to be inserted, which is conducive to the progress of the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a flow chart of the method of the present invention;

[0023] Figure 2 is a schematic diagram of the connection structure between the box column and the backing plate of the present invention;

[0024] Figure 3 is a schematic diagram of the partially cut-open connection structure between the box column and the backing plate of the present invention;

[0025] Figure 4 is a schematic diagram of the connection structure between the backing plate and the support plate of the present invention;

[0026] Figure 5 is a schematic diagram of the sliding groove structure of the present invention;

[0027] Figure 6 is a schematic diagram of the overall section division of the steel structure of the present invention.

[0028] In the diagram: 1. Box column; 2. Pad; 3. Support plate; 4. Through hole; 5. Clamping block; 6. Connecting groove; 7. Rubber traction belt; 8. Slide groove; 9. Column; 10. Through hole; 11. Lifting baffle; 12. Picking groove; 13. Rubber clamp strip; 14. Embedding groove; 15. Rubber pad. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1

[0031] Please see Figure 1 This invention provides a technical solution: a comprehensive unloading construction method for hoisting equipment on a concrete floor, the comprehensive unloading construction method comprising the following steps:

[0032] Construction zones are divided into sections, and component hoisting areas are rationally defined. Specifically, this includes: rationally segmenting components; determining crane parameters based on component technical parameters; clarifying floor slab travel routes; and calculating the structural safety of the crane's travel routes when not in operation. When rationally dividing component hoisting areas, sections are created based on the individual structural form, dividing different construction zones. Travel routes for construction cranes and component transport vehicles are determined based on the construction zones. Technical parameters for mobile cranes are determined based on the hoisting process, and the floor slab load within the mobile crane's travel route is calculated to meet requirements. Finite element analysis software is used for modeling and calculation, and the results are analyzed in conjunction with design drawings. Structural load verification is performed along all planned truck travel routes.

[0033] Mobile crane operating condition calculations include: determining the crane's position during lifting, analyzing the most unfavorable operating conditions at each crane's position, and calculating the forces on the crane's outriggers.

[0034] Design parameters for a concentrated load transfer device for a mobile crane and calculate its strength and stability under stress; including: verifying whether the floor slab bearing capacity meets the requirements, innovating a reasonable load distribution device for the crane outriggers when it does not meet the requirements, determining the parameters of the concentrated load distribution device, calculating the strength and stability of the distribution device, and analyzing the structural stress after adopting the load distribution device;

[0035] Technical drawings and handover documents were prepared; the travel routes of large mobile truck cranes and the stationing diagrams of mobile cranes under working conditions were prepared and technical documents were prepared for handover, which also served as the basis for safety acceptance.

[0036] We have innovatively developed a concentrated load dispersion device. Based on stress and deflection deformation calculations, we guide the on-site work by transferring and dispersing concentrated loads, avoiding the need for large-area floor slab backfilling. We combine this with the rational crane travel routes and lifting point diagrams of the civil engineering zero-level beam and slab distribution, and scientifically calculate the stress on the floor slabs. This facilitates construction, saves costs, and eliminates the need for full-span scaffolding reinforcement measures on the first and second basement levels. It also accelerates the construction period. In the absence of full-span scaffolding reinforcement in the basement, it is beneficial for the subsequent construction processes such as secondary structures, thus promoting the progress of the project.

[0037] Example 2

[0038] Based on Example 1, the comprehensive unloading construction method for lifting equipment in concrete floor conditions is as follows:

[0039] 1. Construction Preparation

[0040] 1) Divide the construction area into sections and rationally divide the component hoisting area.

[0041] (1) Based on the structural form and component size, the construction flow is divided into sections. Taking the conference center as an example, it is divided into 5 construction sections, as detailed below. Figure 6 As shown;

[0042] 2) The hoisting area should be reasonably divided according to the division of the construction area and the weight and size of the components;

[0043] 3) Determine the technical parameters of the mobile crane based on the hoisting process, such as 50t / 80t, and calculate whether the floor load within the mobile crane's travel route meets the requirements, as detailed below:

[0044] (1) Use finite element software to perform modeling and calculation, and analyze the results in conjunction with the design drawings.

[0045] (2) The value of mobile truck crane is taken as follows: the dead load coefficient is taken as 1.3 and the construction live load coefficient is taken as 1.5.

[0046] (3) Structural load calculations were performed on all planned vehicle routes, as shown in the table below;

[0047]

[0048] 4) By calculating for each area, the conclusion is that, in summary, the travel route meets the requirements for both unloaded truck cranes and flatbed trucks of the same weight.

[0049]

[0050] 2. Calculation of mobile crane operating conditions

[0051] 1) Substructure calculation when the truck crane is used for hoisting at the ±0 elevation of the Cultural Exchange Center

[0052] Taking the maximum reaction force of the car, 397.5 kN, acting on both ends of the beam through the distribution beam as the most unfavorable case, the verification results are as follows.

[0053] (1) Conclusion 1: Without any support, the crane outriggers were placed directly on the basement floor, and the floor load could not meet the requirements.

[0054] (1) Conclusion 2: If the concentrated load of the crane outrigger can be transferred to the structural beam at the end of the column to meet the requirements, it is necessary to innovate a certain device to transfer the concentrated load to the structural beam next to the structure.

[0055] The conclusion shows that, except for the infill area which requires scaffolding reinforcement, the beams in other locations can be used for hoisting outriggers after the concentrated load is transferred.

[0056] 3. Design the parameters of the mobile crane's centralized load transfer device and calculate its strength and stability under stress.

[0057] The centralized load transfer device adopts a box-type column of 470X470X20, Q355;

[0058] Precautions:

[0059] (1) The length of the concentrated load transfer device needs to be determined based on the length of the column grid on the basement roof slab, with the total length being the column grid axis + 2m.

[0060] (2) Weld steel of the same specification to each side of the crane outriggers to increase the load-bearing area, such as at the "cross" positions at both ends.

[0061] (3) Combine the force calculation and deflection calculation of the conversion device to determine the thickness of the pads at both ends of the conversion device, so as to avoid the middle part of the conversion device from contacting the floor slab;

[0062] (4) The material type used in the conversion device is selected based on the maximum stress value;

[0063] 4. Calculation of concentrated load transfer device.

[0064] The travel routes of large mobile cranes and the stationing diagrams of mobile cranes under working conditions are formulated and technical documents are prepared for handover, which also serve as the basis for safety acceptance.

[0065] Example 3

[0066] On the basis of the second embodiment, in order to achieve the rapid connection and fixation of the box column 1 and the backing plate 2, the concentrated load transfer device includes a box column 1. A backing plate 2 is provided at the bottom of the box column 1. Two groups of support plates 3 are provided on the surface of the backing plate 2. The two groups of support plates 3 clamp the box column 1. A clamping component is provided on the surface of the support plate 3, and a blocking and pushing member is provided on the surface of the support plate 3. The blocking and pushing member is toggled to limit the clamping component. The clamping component clamps the box column 1 for connecting the box column 1 and the support plate 3. An inclined surface is provided on the top surface of the support plate 3 close to the box column 1. Embedding grooves 14 are jointly formed on the surfaces of the support plate 3 and the backing plate 2. The embedding grooves 14 are in the shape of a "C" - shaped groove. A rubber backing plate 15 is fixed inside the embedding grooves 14. The rubber backing plate 15 is in the shape of a "C" - shaped strip. The rubber backing plate 15 is clamped between the box column 1, the backing plate 2 and the support plate 3 for damping the support plate 3. The clamping component includes a through - hole 4, a clamping block 5, a connecting groove 6, a rubber traction belt 7 and a sliding groove 8. The sliding groove 8 is in the shape of a "C" - shaped groove and is formed on the surface of the support plate 3. The through - hole 4 is formed on the surface of the sliding groove 8. The clamping block 5 is movably inserted into the through - hole 4. A rubber sheet is fixed at one end of the clamping block 5. An inclined surface is provided at the other end of the clamping block 5, and a connecting groove 6 is formed at the other end of the clamping block 5. The middle part of the rubber traction belt 7 is fixed on the surface of the connecting groove 6. The two ends of the rubber traction belt 7 are respectively fixed on two relatively distributed side walls of the through - hole 4. The blocking and pushing member includes a column 9, a through - hole 10, a lifting baffle 11, a picking groove 12 and a rubber clamping strip 13. The lifting baffle 11 is in the shape of a "C" - shaped plate - like structure. Through - holes 10 are formed on both of the two parallel - distributed side plates of the lifting baffle 11. The column 9 passes through the through - hole 10 and is fixed on the surface of the sliding groove 8. The picking groove 12 is formed on the surface of the lifting baffle 11. A plurality of rubber clamping strips 13 are provided, and all the plurality of rubber clamping strips 13 are fixed on the surface of the sliding groove 8. The lifting baffle 11 is toggled to squeeze the clamping block 5, and the rubber clamping strip 13 is clamped between the lifting baffle 11 and the sliding groove 8.

[0067] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A comprehensive unloading method for hoisting equipment on concrete floors, characterized by: The comprehensive unloading construction method includes the following steps: Construction section division, reasonably dividing the component hoisting area; Calculation of the working conditions of mobile truck cranes; Designing the parameters of the centralized load transfer device for mobile truck cranes and calculating the strength and stability under the stress state; Forming technical drawings and disclosure documents; The construction section division, reasonably dividing the component hoisting area specifically includes: reasonably segmenting the components, determining the crane parameters according to the technical parameters of the components, clarifying the floor walking route, and calculating whether the structure of the crane's non-working state walking route is safe; when dividing the construction section and reasonably dividing the component hoisting area, segment according to the single structure form, divide different regional construction sections; determine the walking routes of the construction cranes and component transport vehicles according to the construction sections; determine the technical parameters of the mobile truck crane according to the hoisting process, and calculate whether the floor load within the walking route range of the mobile truck crane meets the requirements, use finite element software for modeling calculation, and analyze according to the results combined with the design drawings; conduct structural load验算 on all planned truck walking routes.

2. The comprehensive unloading construction method for lifting equipment in concrete floor conditions according to claim 1, characterized in that: The calculation of the working conditions of mobile truck cranes includes: determining the standing position of the crane during hoisting, calculating the most unfavorable working conditions analysis of each crane standing position, and calculating the force on the crane outriggers.

3. The comprehensive unloading construction method for lifting equipment in concrete floor conditions according to claim 1, characterized in that: Designing the parameters of the centralized load transfer device for mobile truck cranes and calculating the strength and stability under the stress state includes: rechecking whether the floor bearing capacity meets the requirements, innovating the centralized load transfer device when it does not meet the requirements, determining the parameters of the centralized load transfer device, determining the strength and stability calculation of the centralized load transfer device, and analyzing the structure stress after adopting the centralized load transfer device.

4. The comprehensive unloading construction method for lifting equipment in concrete floor conditions according to claim 1, characterized in that: When forming technical drawings and disclosure documents, form the walking route of the large mobile truck crane and the standing position diagram under the working conditions of the mobile crane, and form technical documents for disclosure, which also serve as the basis for safety acceptance.

5. The comprehensive unloading construction method for lifting equipment in concrete floor conditions according to claim 1, characterized in that: The centralized load transfer device includes a box column (1), a base plate (2) is provided at the bottom of the box column (1), two groups of support plates (3) are provided on the surface of the base plate (2), the two groups of support plates (3) clamp the box column (1), a clamping component is provided on the surface of the support plate (3), and a blocking and pushing member is provided on the surface of the support plate (3), and the blocking and pushing member is toggled to limit the clamping component, and the clamping component clamps the box column (1) for connecting the box column (1) and the support plate (3).

6. The comprehensive unloading construction method for lifting equipment in concrete floor conditions according to claim 5, characterized in that: The support plate (3) is provided with an inclined surface near the top surface of the box column (1), an embedding groove (14) is jointly opened on the surfaces of the support plate (3) and the base plate (2), the embedding groove (14) is a "C"-shaped groove, a rubber base plate (15) is fixed inside the embedding groove (14), the rubber base plate (15) is a "C"-shaped strip, and the rubber base plate (15) is clamped between the box column (1), the base plate (2) and the support plate (3) for damping the support plate (3).

7. The comprehensive unloading construction method for lifting equipment in concrete floor conditions according to claim 5, characterized in that: The clamping component includes a through hole (4), a clamping block (5), a connecting groove (6), a rubber traction belt (7) and a sliding groove (8). The sliding groove (8) is in a "C" - shaped groove, and the sliding groove (8) is opened on the surface of the support plate (3). The through hole (4) is opened on the surface of the sliding groove (8). The clamping block (5) is movably inserted into the through hole (4). A rubber sheet is fixed at one end of the clamping block (5). The other end of the clamping block (5) has an inclined surface, and a connecting groove (6) is opened at the other end of the clamping block (5). The middle of the rubber traction belt (7) is fixed on the surface of the connecting groove (6). The two ends of the rubber traction belt (7) are respectively fixed on two relatively distributed side walls of the through hole (4).

8. The comprehensive unloading construction method for lifting equipment in concrete floor conditions according to claim 7, characterized in that: The blocking and pushing member includes a column (9), a through hole (10), a lifting baffle (11), a picking groove (12) and a rubber clamping strip (13). The lifting baffle (11) is in a "C" - shaped plate - like structure. Through holes (10) are opened on both of the two parallel - distributed side plates of the lifting baffle (11). The column (9) passes through the through hole (10) and is fixed on the surface of the sliding groove (8). The picking groove (12) is opened on the surface of the lifting baffle (11). There are multiple rubber clamping strips (13), and the multiple rubber clamping strips (13) are all fixed on the surface of the sliding groove (8). By拨动升降挡板(11)挤压夹持块(5), the rubber clamping strip (13) is clamped between the lifting baffle (11) and the sliding groove (8). It should be noted that there is an unclear part "拨动升降挡板(11)挤压夹持块(5)" in the original Chinese text. I have translated it as "By拨动升降挡板(11)挤压夹持块(5)" for now. You may need to clarify this part for a more accurate translation.

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