Steel purlin dismantling system and method for covering, excavating and sequentially constructing

Abstract

The present invention discloses a dismantling system and dismantling method for steel purlins used for cover and excavation. The dismantling system includes: an upper hanging point assembly, the upper hanging point assembly includes a plurality of upper hanging points arranged at intervals along the lifting direction of the steel purlin, the plurality of upper hanging points are all arranged above the steel purlin, and the two outermost upper hanging points are respectively located on a protective structure for fixing the steel purlin and above a lifting destination; a lower hanging point assembly, the lower hanging point assembly includes a plurality of lower hanging points arranged on the steel purlin at intervals along the lifting direction of the steel purlin; at least three electric fall chains are used to be selectively connected between one of the upper hanging points and one of the lower hanging points. In an initial connection state, at least one of the electric fall chains is tilted toward the direction of the protective structure, and at least two of the electric fall chains are tilted toward the direction of the lifting destination. Through the dismantling system, lifting is facilitated in a narrow environment.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a steel purlin dismantling system and a dismantling method for cover-excavation construction. Background Art

[0002] At present, the auxiliary structures of subway stations are often designed to transfer with ground buildings such as light rail stations. In order to provide convenient conditions for the ground buildings in advance, the auxiliary structures sometimes need to be constructed by covering and excavating in sequence. When the structure is constructed in sequence, the steel purlins of the enclosure structure need to be removed. However, the auxiliary structure originally has a small space, and the top plate cover structure has been completed during the covering and excavating construction. It is difficult to use mechanical lifting of the steel purlins. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a steel purlin dismantling system and dismantling method for cover-excavation and sequential construction, so as to facilitate the lifting and dismantling of the steel purlin from the bottom of the existing structure.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is a steel purlin dismantling system for cover-excavation and sequential construction, comprising:

[0005] A lifting point assembly, the lifting point assembly comprising a plurality of lifting points spaced apart along the lifting direction of the steel purlin, the plurality of lifting points being located above the steel purlin, and the outermost two lifting points being located on a retaining structure for securing the steel purlin and above a lifting destination, respectively;

[0006] A lower hanging point assembly, the lower hanging point assembly comprising a plurality of lower hanging points arranged on the steel purlin at intervals along the lifting direction of the steel purlin;

[0007] At least three electric fall chains are used to selectively connect between one of the upper hanging points and one of the lower hanging points. In an initial connection state, at least one of the electric fall chains is tilted toward the enclosing structure, and at least two of the electric fall chains are tilted toward the lifting destination.

[0008] A further improvement of the steel purlin dismantling system for cover-excavation construction of the present invention is that, in the initial connection state, the lower hanging point connected to at least one electric fall chain is located on one side of the center of gravity of the steel purlin, and the lower hanging point connected to at least one electric fall chain is located on the other side of the center of gravity of the steel purlin.

[0009] A further improvement of the steel purlin dismantling system for cover-excavation construction of the present invention is that the multiple lower hanging points are evenly spaced, and the horizontal distance between adjacent upper hanging points is greater than the horizontal distance between adjacent lower hanging points.

[0010] A further improvement of the steel purlin removal system for cover-excavation construction of the present invention is that a structural top plate for pre-embedding the upper hanging point assembly is provided above the steel purlin.

[0011] A further improvement of the steel purlin removal system for cover-excavation construction of the present invention is that the electric fall chain is an electric hoist fall chain.

[0012] A further improvement of the steel purlin dismantling system for cover-excavation construction of the present invention is that the enclosure structure includes enclosure piles and crown beams connected to the tops of the enclosure piles, and an installation area for pre-embedding the upper hanging point is formed on the relatively inner side of the crown beam.

[0013] A method for dismantling steel purlins for cover and excavation, comprising the following steps:

[0014] Step 1: Provide the above-mentioned steel purlin removal system for cover excavation;

[0015] Step 2: Connect at least three electric fall chains so that all of the electric fall chains meet a tilting principle, wherein the tilting principle includes: at least one electric fall chain tilts toward the enclosure structure, and at least two electric fall chains tilt toward the hoisting destination;

[0016] Step 3: controlling the electric fall chain tilted toward the enclosure structure to extend, and controlling the electric fall chain tilted toward the hoisting destination to shorten, so that the steel purlin moves in the hoisting direction until the steel purlin moves to a point where the electric fall chain no longer satisfies the tilting principle;

[0017] Step 4: Adjust the connection positions of some or all of the electric fall chains, and make all of the electric fall chains meet the tilt principle;

[0018] Step 5: Repeat steps 3 to 4 above until the steel purlin is moved above the lifting destination, and then lower the steel purlin to the lifting destination.

[0019] A further improvement of the method for dismantling steel purlins by cover-excavation according to the present invention is that the tilting principle of step 2 also includes: at least one lower hanging point connected to an electric hinge is located on one side of the center of gravity of the steel purlin, and at least one lower hanging point connected to an electric hinge is located on the other side of the center of gravity of the steel purlin; when performing step 3, it should be ensured that the steel purlin remains in a horizontal state.

[0020] A further improvement of the method for dismantling steel purlins for cover and excavation construction of the present invention is that before connecting at least three of the electric fall chains, all upper hanging points and all lower hanging points are sequentially numbered according to the direction from the enclosing structure of the steel purlin to the lifting destination; when adjusting the connection position of some or all of the electric fall chains, the connection position of the electric hinge is switched based on the principle of numbering the upper hanging points and the lower hanging points in ascending order.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] 1. By arranging the electric fall chain to connect between the upper lifting point assembly and the lower lifting point assembly for transfer and lifting, the lifting problem of the top plate and cover plate structure in the completed state during the cover and excavation is solved according to local conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 The present invention is a schematic diagram of the initial state of the steel purlin dismantling system and method for covering and excavating the steel purlin.

[0025] Figure 2 The present invention is a schematic diagram of preliminary lifting of steel purlins in a system and method for dismantling steel purlins for cover and excavation.

[0026] Figure 3 The present invention is a schematic diagram of the lifting and transfer of steel purlins in the steel purlin dismantling system and dismantling method for cover and excavation.

[0027] In the figure: 1. First lifting point; 2. Second lifting point; 3. Third lifting point; 4. Fourth lifting point; 5. Fifth lifting point; 6. First lower lifting point; 7. Second lower lifting point; 8. Third lower lifting point; 9. Fourth lower lifting point; 10. Enclosure structure; 11. Steel purlin; 12. Structural top plate; 13. First fall chain; 14. Second fall chain; 15. Third fall chain; 16. Fourth fall chain. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0029] The steel purlin dismantling system and dismantling method for cover-excavation construction of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] See also Figures 1 to 3 As shown in the figure, the steel purlin dismantling system for cover excavation and straightening includes:

[0031] A lifting point assembly, comprising a plurality of lifting points spaced apart along the lifting direction of the steel purlin 11, wherein the plurality of lifting points are located above the steel purlin 11, and the outermost two lifting points are located on the enclosure structure 10 for fixing the steel purlin 11 and above the lifting destination, respectively;

[0032] A lower hanging point assembly, the lower hanging point assembly comprising a plurality of lower hanging points arranged on the steel purlin 11 at intervals along the lifting direction of the steel purlin 11;

[0033] At least three electric fall chains are used to selectively connect between an upper hanging point and a lower hanging point. In the initial connection state, at least one of the electric fall chains is tilted toward the enclosure structure 10, and at least two of the electric fall chains are tilted toward the lifting destination.

[0034] Preferably, in the initial connection state, the lower hanging point connected to at least one electric fall chain is located on one side of the center of gravity of the steel purlin 11, and the lower hanging point connected to at least one electric fall chain is located on the other side of the center of gravity of the steel purlin 11.

[0035] By connecting the two electric fall chains to both sides of the center of gravity of the steel purlin 11, the steel purlin 11 is always kept horizontal during the hoisting process to avoid overturning.

[0036] Preferably, the plurality of lower hanging points are evenly spaced apart, and the horizontal distance between adjacent upper hanging points is greater than the horizontal distance between adjacent lower hanging points.

[0037] Preferably, a structural top plate 12 for pre-embedding the upper hanging point assembly is provided above the steel purlin 11 .

[0038] Preferably, the electric fall chain is an electric hoist fall chain.

[0039] Preferably, the enclosure structure 10 includes enclosure piles and a crown beam connected to the top of the enclosure pile, and an installation area for pre-embedding the hanging point is formed on the relatively inner side of the crown beam.

[0040] A method for dismantling steel purlins for cover and excavation, comprising the following steps:

[0041] Step 1: Provide the above-mentioned steel purlin removal system for cover excavation;

[0042] Step 2: Connect at least three electric fall chains so that all of the electric fall chains meet a tilting principle, wherein at least one of the electric fall chains tilts toward the enclosure structure 10 and at least two of the electric fall chains tilt toward the hoisting destination.

[0043] Step 3: Controlling the electric fall chain tilted toward the enclosure structure 10 to extend, and controlling the electric fall chain tilted toward the hoisting destination to shorten, so that the steel purlin 11 moves along the hoisting direction until the steel purlin 11 moves to a point where the electric fall chain no longer satisfies the tilting principle;

[0044] Step 4: Adjust the connection positions of some or all of the electric fall chains, and make all of the electric fall chains meet the tilt principle;

[0045] Step 5: Repeat the above steps 3 and 4 until the steel purlin 11 is moved above the lifting destination, and then lower the steel purlin 11 to the lifting destination.

[0046] Preferably, the tilting principle of step 2 also includes: at least one hanging point connected to the electric hinge is located on one side of the center of gravity of the steel purlin 11, and at least one hanging point connected to the electric hinge is located on the other side of the center of gravity of the steel purlin 11; when performing step 3, the steel purlin 11 should be kept in a horizontal state.

[0047] Preferably, before connecting at least three of the electric fall chains, all upper hanging points and all lower hanging points are numbered sequentially according to the direction from the enclosure structure 10 of the steel purlin 11 to the lifting destination; when adjusting the connection position of part or all of the electric fall chains, the connection position of the electric hinge is switched based on the principle of numbering the upper hanging points and the lower hanging points in ascending order.

[0048] Provided is an embodiment of lifting a steel purlin 11:

[0049] All upper and lower hanging points are numbered sequentially, wherein the first lower hanging point 6 and the second lower hanging point 7 are located on one side of the center of gravity of the steel purlin 11, and the third lower hanging point 8 and the fourth lower hanging point 9 are located on the other side of the center of gravity of the steel purlin 11;

[0050] In the initial state of hoisting, a first fall chain 13 is connected between the second upper hanging point 2 and the first lower hanging point 6, a second fall chain 14 is connected between the third upper hanging point 3 and the third lower hanging point 8, and a third fall chain 15 is connected between the first upper hanging point 1 and the first lower hanging point 6. The first fall chain 13 and the second fall chain 14 are controlled to shorten, while the third fall chain 15 is controlled to extend. During the control process, the steel purlin 11 is kept in horizontal movement until the steel purlin 11 moves below the second upper hanging point 2 and the third upper hanging point 3, and the third fall chain 15 is removed.

[0051] In the hoisting state, the third fall chain 15 is connected between the fourth upper hanging point 4 and the second lower hanging point 7, and the fourth fall chain 16 is connected between the fifth upper hanging point 5 and the fourth lower hanging point 9. The third fall chain 15 and the fourth fall chain 16 are controlled to shorten, and the first fall chain 13 and the second fall chain 14 are controlled to extend. During the control process, the steel purlin 11 is kept in horizontal movement until the steel purlin 11 moves below the fourth upper hanging point 4 and the fifth upper hanging point 5, and the first fall chain 13 and the second fall chain 14 are removed.

[0052] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0053] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for dismantling steel purlins for cover and excavation, characterized in that: Including steps: Step 1: Provide a steel purlin removal system for cover-excavation construction, the system comprising an upper hanging point assembly, a lower hanging point assembly, and at least three electric fall chains. The upper hanging point assembly comprises a plurality of upper hanging points spaced apart along the lifting direction of the steel purlin, the plurality of upper hanging points being located above the steel purlin, and the outermost two upper hanging points being located on a retaining structure for fixing the steel purlin and above a lifting destination, respectively. The lower hanging point assembly comprises a plurality of lower hanging points spaced apart along the lifting direction of the steel purlin on the steel purlin. Step 2: Connect at least three electric fall chains between one of the upper hanging points and one of the lower hanging points, respectively, so that all of the electric fall chains meet a tilting principle, wherein the tilting principle includes: at least one of the electric fall chains tilts toward the enclosure structure, and at least two of the electric fall chains tilt toward the hoisting destination; Step 3: controlling the electric fall chain tilted toward the enclosure structure to extend, and controlling the electric fall chain tilted toward the hoisting destination to shorten, so that the steel purlin moves in the hoisting direction until the steel purlin moves to a point where the electric fall chain no longer satisfies the tilting principle; Step 4: Adjust the connection positions of some or all of the electric fall chains, and make all of the electric fall chains meet the tilt principle; Step 5: Repeat steps 3 to 4 above until the steel purlin is moved above the lifting destination, and then lower the steel purlin to the lifting destination.

2. The method for dismantling steel purlins for cover-excavation construction according to claim 1, characterized in that: The tilting principle of step 2 also includes: at least one lower hanging point connected to an electric fall chain is located on one side of the center of gravity of the steel purlin, and at least one lower hanging point connected to an electric fall chain is located on the other side of the center of gravity of the steel purlin; when performing step 3, the steel purlin should be kept in a horizontal state.

3. The method for dismantling steel purlins for cover-excavation construction according to claim 1, characterized in that: Before connecting at least three of the electric fall chains, all upper hanging points and all lower hanging points are numbered sequentially in the direction from the enclosing structure of the steel purlin to the lifting destination; when adjusting the connection positions of some or all of the electric fall chains, the connection positions of the electric fall chains are switched based on the principle of numbering the upper hanging points and the lower hanging points in ascending order.

4. The method for dismantling steel purlins for cover-excavation construction according to claim 1, characterized in that: The plurality of lower hanging points are evenly spaced apart, and the horizontal distance between adjacent upper hanging points is greater than the horizontal distance between adjacent lower hanging points.

5. The method for dismantling steel purlins for cover-excavation construction according to claim 1, characterized in that: A structural top plate for pre-embedding the upper hanging point components is provided above the steel purlin.

6. The method for dismantling steel purlins for cover-excavation construction according to claim 1, characterized in that: The electric fall chain is an electric hoist fall chain.

7. The method for dismantling steel purlins for cover-excavation construction according to claim 1, characterized in that: The enclosure structure includes enclosure piles and a crown beam connected to the top of the enclosure piles. An installation area for pre-buried hanging points is formed on the relatively inner side of the crown beam.

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