Hoisting construction method of truck crane in environment with limited bearing capacity of floor slab

Abstract

The invention discloses a hoisting construction method of a truck crane in an environment with limited bearing capacity of a floor slab, which is characterized in that supporting legs of the truck crane are erected on the floor slab and are positioned right above a structural beam, so that the counter force of the supporting legs of the truck crane acts on the structural beam. If no structural beam exists below the supporting leg of the truck crane, a conversion steel beam is erected between the two structural beams located in front of and behind the supporting leg, and the supporting leg is erected on the conversion steel beam. The invention relates to the technical field of building construction, and can solve the problem that in the prior art, a supporting full framing needs to be arranged at the bottom of a floor slab in truck-mounted crane hoisting construction under the environment that the bearing capacity of the floor slab is limited.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a vehicle crane hoisting construction method under an environment where the bearing capacity of a floor slab is limited. Background Art

[0002] In construction projects, mobile cranes often need to hoist materials on the floor slab, and the construction condition is that the bearing capacity of the floor slab needs to meet the load requirements of the mobile crane. In an environment where the bearing capacity of the floor slab is limited, that is, when the bearing capacity of the floor slab cannot meet the load requirements of the mobile crane hoisting construction, it is necessary to set a support frame at the bottom of the floor slab in advance to achieve the purpose of allowing the floor slab to withstand the reaction force of the mobile crane legs during the hoisting process.

[0003] The prior art requires that a full-frame support frame be set up at the bottom of the floor for the construction of the automobile crane under the environment of limited floor bearing capacity, and the construction method has complicated procedures and high construction costs. At the same time, due to the erection of the full-frame support frame, the normal use of the bottom of the floor and the surrounding environment are greatly affected. If there are pipelines, equipment and other structures in the bottom of the floor that interfere with the erection of the full-frame support frame, the structure needs to be dismantled and restored after the automobile crane construction is completed. The construction volume is large, the cost is high, and the operation is very inconvenient. Therefore, it is necessary to provide a method for the construction of automobile cranes under the environment of limited floor bearing capacity, which can solve the problem in the prior art that a full-frame support frame needs to be set up at the bottom of the floor for the construction of automobile cranes under the environment of limited floor bearing capacity. Summary of the invention

[0004] The purpose of the present invention is to provide a method for lifting construction by a truck crane in an environment with limited floor bearing capacity, which can solve the problem in the prior art that a supporting full-frame needs to be set at the bottom of the floor when lifting construction by a truck crane in an environment with limited floor bearing capacity.

[0005] The present invention is achieved in that:

[0006] A method for lifting and constructing a mobile crane in an environment where the bearing capacity of a floor slab is limited, wherein the legs of the mobile crane are erected on the floor slab, and the legs are located directly above a structural beam, so that the reaction force of the legs of the mobile crane acts on the structural beam.

[0007] If there is no structural beam under the supporting leg of the automobile crane, a conversion steel beam is set up between two structural beams located in front and behind the supporting leg, and the supporting leg is erected on the conversion steel beam.

[0008] A steel pad is arranged between the conversion steel beam and the structural beam, so that the conversion steel beam is higher than the floor slab and does not contact the floor slab.

[0009] If the bearing capacity of the structural beam cannot meet the load requirement of the lifting construction of the automobile crane, a steel brace is provided between the structural beam and a structural column adjacent to the structural beam.

[0010] In the top layer, the bottom of the structural beam is embedded with embedded parts, and the bottom of the structural column adjacent to the structural beam is embedded with embedded parts. The two ends of the steel diagonal brace are respectively fixed on the two embedded parts, so that the steel diagonal brace is tilted and supported between the structural beam and the structural column, and the reaction force of the support leg of the automobile crane is transmitted to the structural column through the structural beam and the steel diagonal brace.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The invention supports the legs of the automobile crane on the structural beams, and the reaction force of the legs acts on the structural beams, thereby avoiding overload damage to the floor slab under the environment of limited floor slab bearing capacity, and ensuring the safe lifting construction of the automobile crane; and the legs are preferably directly supported on the structural beams, and the legs that cannot be directly supported on the structural beams are indirectly erected between two adjacent structural beams through conversion steel beams and steel pads, which can ensure that the reaction force acts on the structural beams to avoid the floor slab being stressed, and can also ensure that the use of conversion steel beams is reduced, reduce construction costs, simplify construction procedures, and speed up construction progress. The invention is suitable for automobile crane lifting construction under the environment of limited floor slab bearing capacity, and has good application prospects.

[0013] 2. Since the present invention is provided with steel diagonal braces, when the bearing capacity of the structural beam cannot meet the lifting construction of the automobile crane, the steel diagonal braces are obliquely supported between the structural beam and the adjacent structural columns through the rear embedded parts, so that the load on the structural beam is transferred to the structural column, reducing the load on the structural beam, ensuring the structural safety of the structural beam and the lifting construction safety of the automobile crane, without setting up a supporting full-height frame on the top return layer, without affecting the normal use of the top return layer, and without dismantling and modifying the structures in the top return layer, the impact on the surrounding environment is minimized, the construction cost is lower, the construction process is simpler and more convenient, and the construction period is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a construction plan view of the automobile crane hoisting construction method of the present invention under the environment of limited floor bearing capacity;

[0015] Figure 2 It is a construction elevation view (perpendicular to the direction of the structural beam) of the automobile crane hoisting construction method of the present invention under an environment with limited floor bearing capacity;

[0016] Figure 3 It is a construction elevation view (parallel to the direction of the structural beam) of the automobile crane hoisting construction method of the present invention under an environment with limited floor bearing capacity.

[0017] In the figure, 1 is the truck crane, 2 is the floor slab, 3 is the legs, 4 is the conversion steel beam, 5 is the steel pad, 6 is the steel diagonal brace, 7 is the structural beam, 8 is the structural column, and 9 is the rear embedded parts. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Please see attached Figure 1 To Attachment Figure 3 A method for lifting a mobile crane in an environment where the bearing capacity of a floor slab is limited, wherein the legs 3 of the mobile crane 1 are set on the floor slab 2, and the legs 3 are located directly above the structural beam 7, so that the reaction force of the legs 3 of the mobile crane 1 acts on the structural beam 7.

[0020] The present invention is applicable to the environment where the bearing capacity of the floor 2 cannot meet the reaction force of the legs 3 during the lifting operation of the automobile crane 1, that is, the bearing capacity of the floor 2 is limited. By moving the erection position of the legs 3 to the top of the structural beam 7, the reaction force of the legs 3 acts on the structural beam 7, which can avoid the floor 2 from being overloaded and deformed and damaged. On this basis, there is no need to set up a full-height support frame on the top floor, which greatly shortens the construction period, reduces the construction cost, and avoids the demolition and restoration of the structures in the top floor and the impact on the normal use of the top floor.

[0021] Please see attached Figure 1 To Attachment Figure 3 If there is no structural beam 7 under the supporting leg 3 of the automobile crane 1, a conversion steel beam 4 is set between two structural beams 7 located in front and behind the supporting leg 3, and the supporting leg 3 is set on the conversion steel beam 4.

[0022] The support legs 3 of the mobile crane 1 are preferably directly supported on the structural beam 7. Usually, there are four support legs 3 on both sides of the mobile crane 1. The two support legs 3 at one end of the mobile crane 1 can be directly installed according to the position of the structural beam 7, while the two support legs 3 at the other end of the mobile crane 1 may not be located exactly above the structural beam 7, resulting in the support legs 3 can only be erected on the floor slab 2, which further causes the floor slab 2 to be overloaded.

[0023] An I-beam can be used as a conversion steel beam 4, and the two ends of the two conversion steel beams 4 are respectively mounted on the two structural beams 7 in front and behind the two legs 3 at the other end of the truck crane 1, and then the two legs 3 at the other end of the truck crane 1 are respectively mounted on the two conversion steel beams 4, so that the reaction force of the legs 3 is transmitted to the front and rear two structural beams 7 through the conversion steel beam 4, thereby avoiding the force on the floor slab 2.

[0024] The bending performance and compressive stability of the conversion steel beam 4 must meet the force safety calculation requirements to ensure the stable transmission of the reaction force. It is preferred to directly support the legs 3 on the structural beam 7 to reduce the use of the conversion steel beam 4, thereby saving costs and facilitating the construction progress.

[0025] Please see attached Figure 1 To Attachment Figure 3 A steel pad 5 is arranged between the conversion steel beam 4 and the structural beam 7 so that the conversion steel beam 4 is higher than the floor slab 2 and does not contact the floor slab 2.

[0026] Preferably, the steel pad 5 can be made of thick steel plate, and is used to raise the conversion steel beam 4 above the floor 2 to prevent the conversion steel beam 4 from contacting the floor 2 and causing the floor 2 to be subjected to the reaction force of the support legs 3.

[0027] The thickness of the steel plate can be adaptively selected according to actual needs to ensure that the conversion steel beam 4 will not contact the surface of the floor slab 2 when the maximum disturbance occurs under the most unfavorable stress condition, thereby effectively ensuring that the floor slab 2 is not subjected to stress.

[0028] Preferably, before the legs 3 of the truck crane 1 are in position, the conversion steel beam 4 and the steel pad 5 can be installed in place using a forklift.

[0029] Please see attached Figure 1 To Attachment Figure 3 If the bearing capacity of the structural beam 7 cannot meet the load requirement of the lifting construction of the automobile crane 1 , a steel brace 6 is provided between the structural beam 7 and a structural column 8 adjacent to the structural beam 7 .

[0030] When it is found through calculation that the bearing capacity of the structural beam 7 still cannot meet the lifting construction load requirement of the automobile crane 1, the structural beam 7 will be overloaded and deformed or cracked, etc. The load on the structural beam 7 can be transferred to the structural column 8 through the support of the steel brace 6 to reinforce the structural beam 7, thereby avoiding the situation where the structural beam 7 is overloaded and damaged.

[0031] The steel brace 6 can be adaptively arranged according to the load requirement, and the specification of the steel can be adaptively selected according to the load requirement.

[0032] Please see attached Figure 3 Specifically, in the back-to-top layer, the bottom of the structural beam 7 is embedded with an embedded part 9, and the bottom of the structural column 8 adjacent to the structural beam 7 is embedded with an embedded part 9. The two ends of the steel brace 6 are respectively fixed on the two embedded parts 9, so that the steel brace 6 is tilted and supported between the structural beam 7 and the structural column 8, and the reaction force of the support leg 3 of the car crane 1 is transmitted to the structural column 8 through the structural beam 7 and the steel brace 6.

[0033] Preferably, the bottom of the structural beam 7 and the bottom side of the structural column 8 can be partially chiseled out and embedded with the embedded parts 9, which can be composed of embedded ribs and embedded plates. The embedded ribs extend into the chiseled out part and are fixed by pouring concrete, so that the embedded plates are flush with the bottom surface of the structural beam 7 and the side of the structural column 8, and are used to provide a mounting surface for the steel brace 6. The two ends of the steel brace 6 are cut into inclined surfaces so that they are completely attached to the embedded plates and fully welded and fixed, ensuring that the steel brace 6 is stably braced between the bottom of the structural beam 7 and the bottom side of the structural column 8 through the embedded parts 9, thereby ensuring reliable force transmission.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for hoisting with a mobile crane in an environment with limited floor bearing capacity, characterized by: The supporting legs (3) of the automobile crane (1) are erected on the floor slab (2), and the supporting legs (3) are located directly above the structural beam (7), so that the reaction force of the supporting legs (3) of the automobile crane (1) acts on the structural beam (7).

2. The method for hoisting with a mobile crane under a floor bearing capacity limited environment according to claim 1 is characterized in that: If there is no structural beam (7) below the supporting leg (3) of the automobile crane (1), a conversion steel beam (4) is set between two structural beams (7) located in front and behind the supporting leg (3), and the supporting leg (3) is erected on the conversion steel beam (4).

3. The method for hoisting with a mobile crane under a floor bearing capacity limited environment according to claim 2 is characterized in that: A steel pad (5) is arranged between the conversion steel beam (4) and the structural beam (7), so that the conversion steel beam (4) is erected above the floor slab (2) and does not contact the floor slab (2).

4. The method for hoisting with a mobile crane under a floor bearing capacity limited environment according to any one of claims 1 to 3, characterized in that: If the bearing capacity of the structural beam (7) cannot meet the load requirement of the lifting construction of the automobile crane (1), a steel brace (6) is provided between the structural beam (7) and a structural column (8) adjacent to the structural beam (7).

5. The method for hoisting with a mobile crane under a floor bearing capacity limited environment according to claim 4 is characterized in that: In the top layer, the bottom of the structural beam (7) is embedded with an embedded part (9), and the bottom of the structural column (8) adjacent to the structural beam (7) is embedded with an embedded part (9), and the two ends of the steel diagonal brace (6) are respectively fixed on the two embedded parts (9), so that the steel diagonal brace (6) is tilted and supported between the structural beam (7) and the structural column (8), and the reaction force of the support leg (3) of the automobile crane (1) is transmitted to the structural column (8) through the structural beam (7) and the steel diagonal brace (6).

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