1. Method for unloading a temporary support structure, characterized in that it is used for supporting an overhanging structure of a building during construction, said temporary support structure comprising a support platform and a support vertically arranged between said overhanging structure and said support platform, said unloading method comprising the following steps:

calculating the downwarping value of the connection position of the cantilever structure and the supporting piece under the condition of no support;

cutting the supporting piece for multiple times along the downwarping direction of the cantilever structure, and at least spacing a first time between every two times until the total height of the cut and removed part of the supporting piece is equal to 90% -110% of the downwarping value;

standing for a second time;

removing the support and the support platform.

2. Method for unloading a temporary support structure according to claim 1, wherein said removal of said support and support platform comprises the following steps:

cutting the support piece along the downwarping direction of the overhanging structure to form a gap with the height smaller than 20mm between the support piece and the overhanging structure;

removing the support and the support platform.

3. The unloading method of a temporary support structure according to claim 1, wherein the support member is cut in said plurality of times, each time the height of the cut portion is 7mm to 15 mm.

4. A method of unloading a temporary support structure according to claim 1, wherein the first time is one to two natural days.

5. A method of unloading a temporary support structure according to claim 1, wherein the second time is more than one natural day.

6. The method of unloading a temporary support structure of claim 1, wherein the supporting member is an i-beam, the supporting member is disposed between the cantilever structure and the support platform in a posture in which a length direction thereof is parallel to a vertical direction, and the method of cutting the supporting member includes cutting a flange and then cutting a web.

7. A method of unloading a temporary support structure according to any of claims 1 to 6, wherein the temporary support structure further comprises diagonal braces provided inside the cantilever structure, and wherein the step of removing the support members and the support platform further comprises the following steps:

and removing the inclined strut inside the cantilever structure.

8. Method for unloading a temporary support structure according to claim 7, wherein said removal of the braces inside the cantilever structure comprises the following steps:

grooving the inclined strut to reduce the cross-sectional area of the groove position of the inclined strut;

and standing for a third time, and removing the inclined strut after the deformation of the inclined strut is finished.

9. Method for unloading a temporary support structure according to claim 7, wherein said third time is one to three natural days.

Background

More and more buildings are being planned with overhanging structures during the design phase. Aiming at the construction of the cantilever structure, a support system can be temporarily built to support the cantilever structure, and the support system is unloaded after the construction is completed. In the process of unloading the supporting system, the stress inside the cantilever structure is released violently, and the cantilever structure is easy to collapse.

Content of application

The present application is directed to solving at least one of the problems in the prior art. Therefore, the temporary supporting structure unloading method is provided to reduce the intensity of internal stress release of the cantilever structure during unloading and improve the construction safety.

Method for unloading a temporary support structure for supporting an overhanging structure of a building under construction, the temporary support structure comprising a support platform and a support vertically arranged between the overhanging structure and the support platform, the unloading method comprising the steps of:

calculating the downwarping value of the connection position of the cantilever structure and the supporting piece under the condition of no support;

cutting the supporting piece for multiple times along the downwarping direction of the cantilever structure, and at least spacing a first time between every two times until the total height of the cut and removed part of the supporting piece is equal to 90% -110% of the downwarping value;

standing for a second time;

removing the support and the support platform.

According to the unloading method of the temporary support structure, at least the following technical effects are achieved: the total height of the cutting part of the supporting piece can be known in advance by calculating the downwarping value of the cantilever structure, so that the supporting piece with the proper length can be selected, and the supporting piece with the proper section shape can be selected, so that the construction safety can be improved; the supporting piece is cut for multiple times, and at least the first time is separated between every two cuts, so that the internal stress of the cantilever structure can be slowly released, the construction safety is improved, the collapse of the cantilever structure is effectively prevented, and meanwhile, constructors can conveniently detect the internal stress condition of the cantilever structure at any time to make a corresponding construction plan; after the total height of the cutting part of the supporting piece is close to the downwarping value, the residual stress of the cantilever structure is small, the internal structure tends to be in a stable state, the pressure on the supporting piece is small, and therefore the supporting piece and the supporting platform are removed at the moment, and the construction safety is good.

According to an embodiment of the present application, the removing the supporting member and the supporting platform includes the following steps:

cutting the support piece along the downwarping direction of the overhanging structure to form a gap with the height smaller than 20mm between the support piece and the overhanging structure;

removing the support and the support platform.

According to the embodiment of the application, the supporting piece is cut for multiple times, and the height of the cutting part is 7-15 mm each time.

According to an embodiment of the application, the first time is one to two natural days.

According to the embodiment of the application, the second time is more than one natural day.

According to the embodiment of the application, support piece is the I-steel, support piece uses the parallel gesture setting of length direction and vertical direction to be in between structure and the supporting platform encorbelments, support piece's excision method is for excising the flange earlier, excises the web again.

According to the embodiment of the application, the temporary supporting structure further comprises an inclined strut, the inclined strut is arranged inside the cantilever structure, and after the step of removing the supporting piece and the supporting platform, the temporary supporting structure further comprises the following steps:

and removing the inclined strut inside the cantilever structure.

According to the embodiment of the application, the step of removing the inclined strut inside the cantilever structure comprises the following steps:

grooving the inclined strut to reduce the cross-sectional area of the groove position of the inclined strut;

and standing for a third time, and removing the inclined strut after the deformation of the inclined strut is finished.

A method of unloading a temporary support structure according to claim 7, the third time being one to three natural days.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

Fig. 1 is a schematic flow chart illustrating an unloading method of a temporary support structure according to an embodiment of the present application;

fig. 2 is a schematic view of step S200 of the unloading method of the temporary support structure shown in fig. 1;

FIG. 3 is a schematic structural view of one of the structures of a support member of the temporary support structure according to an embodiment of the present disclosure;

fig. 4 is a detailed flowchart illustrating a step S400 of the unloading method of the temporary support structure shown in fig. 1;

fig. 5 is a detailed flowchart illustrating a step S500 of the unloading method of the temporary support structure shown in fig. 1;

fig. 6 is a schematic view of step S500 of the unloading method of the temporary support structure shown in fig. 1.

Reference numerals: an overhanging structure 100; a support member 200; a cutting portion 210; a support platform 300; a diagonal brace 400; a slot 410; flanges 510; a web 520.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "obverse," "reverse," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

The unloading method of the temporary support structure of the present application is explained below with reference to fig. 1 and 2, and includes:

method for unloading a temporary support structure for supporting an overhanging structure 100 of a building under construction, the temporary support structure comprising a support platform 300 and a support 200, the support 200 being vertically arranged between the overhanging structure 100 and the support platform 300, the unloading method comprising the steps of:

s100, calculating a downwarping value of the connection position of the cantilever structure 100 and the supporting piece 200 under the condition of no support;

s200, cutting the supporting piece 200 for multiple times along the downwarping direction of the cantilever structure 100, and at least spacing first time between every two times until the total height of the cut and removed part of the supporting piece 200 is equal to 90% -110% of the downwarping value;

s300, standing for a second time;

s400, removing the supporting piece 200 and the supporting platform 300.

It should be appreciated that the support platform 300 in the present application has a greater rigidity than the cantilever structure 100, and depending on the construction scenario of the cantilever structure 100, the support platform 300 may be built on the ground and extend to the vicinity of the cantilever structure 100, or may be built on a building body and extend to the vicinity of the cantilever structure 100. The support platform 300 may be constructed in various forms, and preferably has a truss structure. The cantilever structure 100 in the present application may be used to complete the concrete construction stage or only the main steel structure construction stage according to the difference of the construction stage.

In step S200: the support member 200 is cut in multiple passes, with the support member 200 being cut in a number of different ways, preferably starting from the upper end of the support member 200, each time a portion of the height of material is cut and removed (see cut 210 in fig. 2, with the sequence of cuts from a to D), forming a new top surface for contact with the cantilever structure 100.

It should be understood that flame cutting is generally used for cutting the support 200, and the cutting width of the flame cutting is difficult to control, so that in step S200, there is an error in the last cutting of the support 200, so that the total height of the removed portion of the support 200 is equal to 90% -110% of the downwarping value, but most of the stress inside the overhanging structure can be released, and the subsequent removal of the support platform 300 and the support 200 is not greatly affected.

It is conceivable that the support 200 may be provided in plural, but uniform cutting time is required.

Specifically, by calculating the down-deflection value of the cantilever structure 100, the total height of the cut portion of the support member 200 can be known in advance, so that the support member 200 having an appropriate length can be selected, and the support member 200 having an appropriate cross-sectional shape can be selected, thereby improving the safety of construction; cutting the supporting member 200 for multiple times, and at least spacing the first time between every two cuts to slowly release the internal stress of the cantilever structure 100, thereby improving the construction safety, effectively preventing the collapse of the cantilever structure 100, and simultaneously facilitating constructors to detect the internal stress condition of the cantilever structure 100 at any time and making a corresponding construction plan; after the total height of the cutting portion 210 of the supporting member 200 is close to the downwarping value, the residual stress of the cantilever structure 100 is small, the internal structure tends to a stable state, and the pressure on the supporting member 200 is small, so that the construction safety is good when the supporting member 200 and the supporting platform 300 are removed.

Further, the supporting member 200 is cut in the plurality of times, and the height of each cut part is 7mm to 15 mm.

Further, the first time is one to two natural days.

Further, the second time is more than one natural day.

Further, the supporting member 200 is an i-beam, referring to fig. 3, the supporting member 200 is disposed between the overhanging structure 100 and the supporting platform 300 in a posture in which the length direction is parallel to the vertical direction, and the cutting method of the supporting member 200 includes cutting the flange 510 first and then cutting the web 520.

In some embodiments of the present application, referring to fig. 4, in step S400, the removing the supporting member 200 and the supporting platform 300 includes the following steps:

s410, cutting the supporting piece 200 along the downward flexing direction of the cantilever structure 100 to form a gap with the height smaller than 20mm between the supporting piece 200 and the cantilever structure 100;

s420, removing the supporting piece 200 and the supporting platform 300.

In addition, after standing for the second time, the support 200 is cut again to form a gap smaller than 20mm, and the gap is present, so that the support 200 and the support platform 300 can be conveniently removed; in addition, in some cases, the actual subsidence value of the cantilever structure 100 may be greater than the deflection value, so setting a gap of less than 20mm facilitates the constructor to observe the actual condition of the cantilever structure 100 and take countermeasures, making the construction safer and more reasonable.

In some embodiments of the present application, referring to fig. 1 and 6, the temporary supporting structure further includes a diagonal brace 400, the diagonal brace 400 is disposed inside the cantilever structure 100, and after the step of removing the supporting member 200 and the supporting platform 300, the following steps are further included:

s500, removing the inclined strut 400 in the cantilever structure 100.

In some embodiments of the present application, the removing the brace 400 inside the cantilever structure 100, referring to fig. 5 and 6, includes the following steps:

s510, grooving the inclined strut 400 to reduce the cross-sectional area of the grooving position of the inclined strut 400;

s520, standing for a third time, and removing the inclined strut 400 after the deformation of the inclined strut 400 is finished.

Further, the third time is one to three natural days.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.