CN117266627B - Method for dismantling high-altitude large-span roof truss - Google Patents
Method for dismantling high-altitude large-span roof truss Download PDFInfo
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- CN117266627B CN117266627B CN202311566353.3A CN202311566353A CN117266627B CN 117266627 B CN117266627 B CN 117266627B CN 202311566353 A CN202311566353 A CN 202311566353A CN 117266627 B CN117266627 B CN 117266627B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000010276 construction Methods 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 238000003466 welding Methods 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 abstract description 13
- 238000004804 winding Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/08—Wrecking of buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/04—Propping of endangered or damaged buildings or building parts, e.g. with respect to air-raid action
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Abstract
The invention discloses a method for dismantling a high-altitude large-span roof truss, which comprises the following steps that a supporting and top reinforcing measure is arranged below a lower chord of a roof; paving a steel springboard above the lower chord of the roof as a construction platform, or taking an existing structural floor above the lower chord of the roof as a construction platform, and simultaneously dismantling the upper chord of the roof and the web members of the roof at each point on the construction platform in a large area; removing the construction platform above the lower chord of the roof; and removing the lower chord and the supporting roof reinforcement measures of the roof. The invention has ingenious conception, ensures that the roof upper chord and the roof web member do not need to bear stress by supporting and reinforcing measures, provides possibility for the early dismantling of the roof upper chord and the roof web member, optimizes the dismantling procedure, and further constructs a construction protection platform on the roof lower chord, so that constructors can dismantle the roof upper chord and the roof web member on the construction protection platform in advance, and can dismantle the roof upper chord and the roof web member simultaneously in a large area, liberate the tower crane capacity and greatly improve the dismantling work efficiency.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a method for dismantling a high-altitude large-span roof truss.
Background
With the rapid development of the building industry in China, the building modeling is more and more complex, the structural form is more and more novel, and the steel structure is more and more frequently applied to the building. Because the truss type roof has the advantages of light dead weight, wide space, simple and convenient construction and the like, the truss type roof is widely applied to the fields of large-scale plants, venues, super high-rise buildings and the like. However, as the service life increases, or for certain structural retrofit requirements, it is inevitable that the truss roof structure will need to be retrofitted and dismantled.
The existing dismantling method mostly adopts a mode of matching a full scaffold with a tower crane for dismantling, namely, a scaffold is erected on a floor below a roof truss, and then the truss upper chord and the truss lower chord are taken as an integral section for blocking and dismantling at the same time according to the stress condition of the roof truss. The dismantling method occupies long tower crane time, and the whole dismantling efficiency is limited. In addition, part of the roof truss layer can be used as a machine room layer, so that structural floors at the lower chord positions of the roof trusses can be poured to serve as a machine room maintenance channel, under the situation, structural floors at the lower chord positions of the roof trusses need to be removed firstly, and then the roof trusses are removed, however, because the upper chord of the roof is shielded, the structural floors at the lower chord positions of the roof cannot be removed in large blocks by means of a tower crane, and can only be removed in small blocks in a cutting mode, and therefore, the removal efficiency of the structural floors at the lower chord positions of the roof trusses can be seriously restricted by the existing integral removal mode of the roof trusses, and further the removal efficiency of the whole roof truss system is further reduced.
Disclosure of Invention
The invention aims to provide a method for dismantling a high-altitude large-span roof truss, which aims to solve the technical problems in the background technology.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a method for dismantling a high-altitude large-span roof truss comprises the following steps:
step S1, setting a supporting and top reinforcing measure below the lower chord of the roof;
s2, paving a steel springboard above the lower chord of the roof as a construction platform, or taking an existing structural floor above the lower chord of the roof as the construction platform, and removing the upper chord of the roof and the web members of the roof at each point on the construction platform in a large area at the same time;
s3, removing a construction platform above the lower chord of the roof;
and S4, removing the lower chord and the supporting roof reinforcement measures of the roof.
Preferably, the process of winding the roof and removing the web members of the roof in step S2 specifically includes the following steps:
s21, welding a holding pole at the top of a junction of the upper chord member of the roof, and welding a lifting lug on the holding pole;
s22, welding lifting lugs at two ends of an upper chord diagonal brace of a roof upper chord, hanging a chain block between the lifting lugs arranged at the end parts of the upper chord diagonal brace and the lifting lugs arranged on the holding poles at corresponding positions, cutting off the end parts of the upper chord diagonal brace, and lowering the cut upper chord diagonal brace to a construction platform through the cooperation of the chain blocks at two sides for carrying away;
s23, segmenting the upper string secondary beams of the upper string of the roof according to spans, welding lifting lugs at two ends of each segment of upper string secondary beam, hanging a chain block between the lifting lugs arranged at the end parts of the single segment of upper string secondary beams and the lifting lugs arranged on the holding poles at corresponding positions, cutting off the single segment of upper string secondary beams along the end parts, and lowering the cut upper string secondary beams to a construction platform for carrying away through the cooperation of chain blocks at two sides;
s24, determining a straight web member needing to be removed preferentially, welding lifting lugs at two ends of the straight web member and all inclined web members needing to be removed preferentially, correspondingly welding lifting lugs at the bottoms of the upper chord girders above the lifting lugs at the end parts of the straight web member and the inclined web member, hanging chain links between the corresponding lifting lugs of the straight web member and the upper chord girders or between the corresponding lifting lugs of the inclined web member and the upper chord girders, cutting the straight web member or the inclined web member along the end parts, and lowering the cut straight web member or the cut inclined web member to a construction platform through the cooperation of chain links at two sides for carrying away;
s25, two pairs of left straight web members are paired, and a door-shaped frame is formed by the left straight web members and an upper chord main beam at the top ends of the left straight web members and the upper chord main beam;
s26, welding lifting lugs at two ends of an upper chord girder which is not drawn into the door-type frame section, hanging a chain block between the lifting lugs arranged at the end part of the upper chord girder and the lifting lugs arranged on the holding poles at corresponding positions, cutting off the end part of the upper chord girder which is not drawn into the door-type frame section, and lowering the cut upper chord diagonal bracing to a construction platform through the cooperation of the chain blocks at two sides for carrying away;
and S27, dismantling the straight web members and the upper chord girders corresponding to the gate-type frames together by means of a tower crane.
Preferably, the process of removing the construction platform in the form of the existing structural floor in the step S3 specifically includes the following steps:
s31, dividing the structural floor slab into a plurality of unit cutting plates;
step S32, forming through holes on the unit cutting plate according to design point positions;
step S33, two hoisting steel beams are additionally arranged below the unit cutting plate, the unit cutting plate is supported by the two hoisting steel beams, and lifting lugs welded at the end parts of each hoisting steel beam need to protrude from the through holes;
s34, hooking a lifting hook of the tower crane to a lifting lug for lifting the steel beam;
and S35, cutting the unit cutting plate from the structural floor slab and lifting away the unit cutting plate through a tower crane.
Preferably, the step S35 specifically includes the following steps:
step S351, cutting the non-stressed direction of the plate by a water saw cutting unit;
step S352, the tower crane lifts up the unit cutting plate through four lifting lugs;
step S353, two water saws cut two edges of the plate in the stress direction at the same time by the cutting unit;
and S354, hoisting the cut unit cutting plate by using a tower crane after cutting is completed.
Preferably, the supporting and reinforcing measures are reinforcing diagonal braces, the top ends of the reinforcing diagonal braces are welded and fixed at the junction of a lower chord main beam and a lower chord secondary beam of a lower chord of the roof, and the bottom ends of the reinforcing diagonal braces are welded and fixed on the structural beams below the lower structural floor slab.
Preferably, the removing process of the lower chord of the roof in the step S4 specifically includes the following steps:
s41, welding a holding pole at the top of a junction point of a lower chord member of the roof, and welding a lifting lug on the holding pole;
s42, welding lifting lugs at two ends of a lower chord diagonal brace of a lower chord of the roof, hanging a chain block between the lifting lugs arranged at the end parts of the lower chord diagonal brace and the lifting lugs arranged on the holding poles at corresponding positions, cutting off the end parts of the lower chord diagonal brace, and lowering the cut lower chord diagonal brace to a floor slab of a lower layer structure through the cooperation of chain blocks at two sides for carrying away;
s43, segmenting a lower chord secondary beam of a lower chord of a roof according to a span, welding lifting lugs at two ends of each lower chord secondary beam, hanging a chain block between the lifting lugs arranged at the end parts of the single-segment lower chord secondary beams and the lifting lugs arranged on the holding poles at corresponding positions, cutting off the single-segment lower chord secondary beams along the end parts, and lowering the cut lower chord secondary beams to a floor slab of a lower layer structure through the cooperation of chain blocks at two sides for carrying away;
s44, segmenting a lower chord girder of a lower chord of a roof according to a span, wherein a segment comprising a reinforced diagonal bracing needs to be shortened to the outer side of a projection range of the reinforced diagonal bracing, welding lifting lugs at two ends of each segment of lower chord girder, hanging a chain block between lifting lugs arranged at the end part of a single segment of lower chord girder and lifting lugs arranged on a holding pole at a corresponding position, cutting off the end part of the single segment of lower chord girder, and lowering the cut lower chord girder to a lower layer structure floor slab through matching of the chain blocks at two sides for carrying away;
and S45, dismantling the reinforcing diagonal brace and the lower chord main girder together by means of a tower crane.
Compared with the prior art, the invention has the beneficial effects that: the invention has ingenious conception, ensures that the roof lower chord has independent bearing capacity through supporting and reinforcing measures, ensures that the roof upper chord and the roof web member do not need to bear stress, provides possibility for the advanced dismantling of the roof upper chord and the roof web member, optimizes the dismantling procedure, and further constructs a construction protection platform on the roof lower chord, so that constructors can dismantle the roof upper chord and the roof web member on the construction protection platform in advance, can dismantle the roof upper chord and the roof web member in large area simultaneously, liberates the tower crane transporting capacity, greatly improves the dismantling work efficiency, simultaneously avoids the shielding of a roof truss to a structural floor slab, removes obstacles for large-block dismantling of the structural floor slab in cooperation with a tower crane, and ensures the safety of the dismantling operation on the premise of avoiding the establishment of a full scaffold, thereby achieving the purposes of cost reduction and synergy.
Drawings
The foregoing and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are meant to be illustrative only and not limiting of the invention, wherein:
FIG. 1 is a schematic view of the structure of the present invention after the reinforcement diagonal bracing is provided in step S1;
fig. 2 is a schematic structural view of the present invention after the winding displacement beam is removed in step S23;
fig. 3 is a schematic structural view of the present invention after removing part of the straight web members and all the diagonal web members in step S24;
FIG. 4 is a schematic view of the structure of the present invention after removing the upper chord girders not laced into the portal frame segments in step S26;
FIG. 5 is a schematic view of the structure of the present invention after the gate frame is removed in step S27;
FIG. 6 is a schematic view of the construction platform of the present invention in the form of a structural floor removed in step S3;
FIG. 7 is a schematic view of the structure of the present invention after removing a portion of the bottom chord girder in step S44;
FIG. 8 is a schematic view of the structure of the present invention after the removal of the full lower chord main beam and the reinforcement diagonal brace in step S45;
FIG. 9 is a schematic side view of the present invention after placement of the reinforcement braces;
fig. 10 is a schematic structural view of the pole of the present invention;
FIG. 11 is a schematic view of the construction of the present invention with the lug and chain block removed from the web member;
FIG. 12 is a schematic view of the structure of the present invention when the winding displacement beam is removed by the clasping post, lifting lug and chain block;
FIG. 13 is a schematic top view of the construction platform of the present invention in the form of a demolished structural floor;
fig. 14 is a schematic cross-sectional view of a construction platform of the invention in the form of a demolished structural floor.
Reference numerals: 1. winding the roof; 101. a main girder of an upper chord; 102. a winding secondary beam; 103. a winding diagonal brace; 2. the roof is lower chord; 201. a lower chord main beam; 202. a lower chord secondary beam; 203. a lower chord diagonal brace; 3. roof web members; 301. a straight web member; 302. a diagonal web member; 4. structural floor slab; 5. a structural upright; 6. a structural beam; 7. reinforcing diagonal braces; 8. holding pole; 9. lifting lugs; 10. chain block; 11. hoisting the steel girder; 12. and a through hole.
Detailed Description
Hereinafter, an embodiment of a method for removing a high-altitude large-span roof truss according to the present invention will be described with reference to the accompanying drawings. The examples described herein are specific embodiments of the present invention, which are intended to illustrate the inventive concept, are intended to be illustrative and exemplary, and should not be construed as limiting the invention to the embodiments and scope of the invention. In addition to the embodiments described herein, those skilled in the art can adopt other obvious solutions based on the disclosure of the claims and specification of the present application, including those adopting any obvious substitutions and modifications to the embodiments described herein.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "top", "bottom", "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The drawings in the present specification are schematic views, which assist in explaining the concept of the present invention, and schematically show the shapes of the respective parts and their interrelationships. Note that, in order to clearly show the structures of the components of the embodiments of the present invention, the drawings are not drawn to the same scale. Like reference numerals are used to denote like parts.
The principles and features of the present invention are described below with reference to the drawings, the illustrated embodiments are provided for illustration only and are not intended to limit the scope of the present invention. The preferred embodiment of the present invention is described in further detail below in conjunction with fig. 1-14:
as shown in fig. 1-14, the method for removing the high-altitude large-span roof truss in the invention comprises the following steps:
step S1, as shown in fig. 1 and 9, a roof reinforcement measure is arranged below a roof lower chord 2, the roof reinforcement measure can be in the form of a reinforcement diagonal brace 7, the reinforcement diagonal brace 7 can obliquely support the roof at a span or a span third position of a lower chord main beam 201, the top end of the reinforcement diagonal brace 7 is welded and fixed at the junction of the lower chord main beam 201 and a lower chord secondary beam 202 of the roof lower chord 2, the bottom end of the reinforcement diagonal brace 7 is welded and fixed on a structural beam 6 below a lower structural floor slab 4, after the reinforcement diagonal brace 7 is supported, the roof upper chord 1 and a roof web member 3 do not need to bear stress, and meanwhile, the roof lower chord 2 has independent bearing capacity, so the roof upper chord 1 and the roof web member 3 can be removed at all points at the same time;
step S2, in order to ensure smooth implementation of simultaneous demolition, providing construction conditions for constructors, which are wide enough and safe, a steel springboard needs to be paved above the lower chord 2 of the roof as a construction platform, or an existing structural floor slab 4 above the lower chord 2 of the roof is directly used as a construction platform (when a roof truss is used as a machine room layer and the structural floor slab 4 is originally poured at the position of the lower chord 2 of the roof), and large-area simultaneous demolition is carried out on the upper chord 1 of the roof and the web members 3 of the roof at each point on the construction platform, wherein the demolition process of the upper chord 1 of the roof and the web members 3 of the roof specifically comprises the following steps,
step S21, as shown in FIG. 10, welding a holding pole 8 at the top of a rod junction of the upper chord 1 of the roof, and welding a lifting lug 9 on the holding pole 8, wherein the setting of the holding pole 8 can provide a stable enough suspension fulcrum above the current dismantling plane, thereby creating a foundation for the installation of the chain block 10;
s22, welding lifting lugs 9 at two ends of an upper chord diagonal brace 103 of a roof upper chord 1, hanging a chain block 10 between the lifting lugs 9 arranged at the end parts of the upper chord diagonal brace 103 and the lifting lugs 9 arranged on a holding pole 8 at the corresponding position, tensioning the chain block 10, cutting off the end parts of the upper chord diagonal brace 103, and releasing the chain block 10 at two sides in a matched manner to lower the cut upper chord diagonal brace 103 to a construction platform for carrying away;
step S23, as shown in figures 1-2 and 12, the upper chord secondary beams 102 of the upper chord 1 of the roof are segmented according to spans, lifting lugs 9 are welded at two ends of each segment of upper chord secondary beam 102, a chain block 10 is hung between the lifting lugs 9 arranged at the end parts of the single segment of upper chord secondary beams 102 and the lifting lugs 9 arranged on the holding poles 8 at corresponding positions, the single segment of upper chord secondary beams 102 are cut off along the end parts, and the cut upper chord secondary beams 102 are lowered to a construction platform through the cooperation of the chain blocks 10 at two sides to be carried away;
step S24, as shown in fig. 2-3 and 11, determining a straight web member 301 to be removed preferentially, welding lifting lugs 9 at two ends of the straight web member 301 to be removed preferentially and all inclined web members 302, correspondingly welding lifting lugs 9 at the bottom of an upper chord main beam 101 above the lifting lugs 9 at the end parts of the straight web member 301 and the inclined web member 302, hanging a chain block 10 between the corresponding lifting lugs 9 of the straight web member 301 and the upper chord main beam 101 or between the corresponding lifting lugs 9 of the inclined web member 302 and the upper chord main beam 101, cutting the straight web member 301 or the inclined web member 302 along the end parts, and lowering the cut straight web member 301 or the cut inclined web member 302 to a construction platform for carrying by matching the chain blocks 10 at two sides;
step S25, the remaining straight web members 301 are paired in pairs, and form a door-shaped frame with the upper chord main beams 101 at the top ends of the two pairs;
step S26, as shown in fig. 3-4, welding lifting lugs 9 at two ends of an upper chord girder 101 which is not drawn into a door-shaped frame section, hanging a chain block 10 between the lifting lugs 9 arranged at the end part of the upper chord girder 101 and the lifting lugs 9 arranged on the holding poles 8 at corresponding positions, cutting off the end part of the upper chord girder 101 which is not drawn into the door-shaped frame section, and lowering the cut upper chord diagonal bracing 103 to a construction platform for carrying away through the cooperation of the chain blocks 10 at two sides;
step S27, as shown in fig. 4-5, dismantling the straight web members 301 and the upper chord main beams 101 corresponding to the gate-type frames together by means of a tower crane;
step S3, as shown in figures 5-6, removing the construction platform above the roof lower chord 2, and when the construction platform is in the form of the existing structural floor 4, the removal process specifically comprises the following steps,
s31, dividing the structural floor slab 4 into a plurality of unit cutting plates, wherein in the conventional dismantling method, the tower crane is limited, and the hoisting stability of the concrete blocks formed after the cutting is poor, so that the concrete blocks are required to be controlled to be about 500mm in order to ensure the construction safety, however, the size of the unit cutting plates can be increased to about 2500 multiplied by 4000mm by adding a hoisting steel beam 11 to be matched with the dismantling method of the tower crane, and the size of the unit cutting plates is required to meet the weight requirement of the tower crane;
step S32, through holes 12 are drilled on the unit cutting plates through water drills according to design points, four through holes 12 are drilled on each unit cutting plate to ensure the installation of two hoisting steel beams 11, and the hoisting steel beams 11 are made of H125X 6.5X 9 type steel materials;
step S33, as shown in fig. 13-14, two hoisting steel beams 11 are additionally arranged below the unit cutting plate, the unit cutting plate is supported by the two hoisting steel beams 11, and lifting lugs 9 welded at the end part of each hoisting steel beam 11 need to extend out of the through holes 12;
s34, hooking a lifting hook of the tower crane to a lifting lug 9 for lifting the steel beam 11;
step S35, cutting the unit cutting plate from the structural floor slab 4 and lifting the unit cutting plate by a tower crane, wherein the specific dismantling process can refer to the following steps,
step S351, a water saw cutting unit cuts the non-stress direction of the plate, namely one side of a short side of 2.5m of the concrete block;
step S352, the tower crane lifts up the unit cutting plate block through four lifting lugs 9;
step S353, two water saws cut two sides of the plate in the stress direction, namely 4m long side at the same time;
s354, hoisting away cut unit cutting plates by using a tower crane after cutting is completed;
s4, dismantling the lower chord 2 of the roof and supporting and reinforcing measures, wherein the specific dismantling process is as follows,
s41, welding a holding pole 8 at the top of a junction of the rod pieces of the lower chord 2 of the roof, and welding a lifting lug 9 on the holding pole 8;
step S42, welding lifting lugs 9 at two ends of a lower chord diagonal bracing 203 of a lower chord 2 of the roof, hanging a chain block 10 between the lifting lugs 9 arranged at the end parts of the lower chord diagonal bracing 203 and the lifting lugs 9 arranged on the holding poles 8 at corresponding positions, cutting off the end parts of the lower chord diagonal bracing 203, and lowering the cut lower chord diagonal bracing 203 to a lower-layer structure floor slab 4 through the cooperation of the chain blocks 10 at two sides for carrying away;
step S43, segmenting the lower chord sub beams 202 of the roof lower chord 2 according to spans, welding lifting lugs 9 at two ends of each segment of lower chord sub beams 202, hanging down chains 10 between the lifting lugs 9 arranged at the end parts of the single segment of lower chord sub beams 202 and the lifting lugs 9 arranged on the holding poles 8 at corresponding positions, cutting off the single segment of lower chord sub beams 202 along the end parts, and lowering the cut lower chord sub beams 202 to a lower layer structure floor slab 4 through the cooperation of the two side down chains 10 for carrying away;
step S44, as shown in fig. 6-7, segmenting the lower chord girder 201 of the roof lower chord 2 according to spans, wherein the segment containing the reinforcing diagonal bracing 7 needs to shorten the segment lower chord girder 201 to the outer side of the projection range of the reinforcing diagonal bracing 7, welding lifting lugs 9 at two ends of each segment of lower chord girder 201, hanging a chain block 10 between the lifting lugs 9 arranged at the end part of the single segment of lower chord girder 201 and the lifting lugs 9 arranged on the holding pole 8 at the corresponding position, cutting off the single segment of lower chord girder 201 along the end part, and lowering the cut lower chord girder 201 to the lower layer structure floor slab 4 through the cooperation of the chain blocks 10 at two sides for carrying away;
in step S45, as shown in fig. 7 to 8, the reinforcement diagonal member 7 and the lower chord main beam 201 are removed together by means of a tower crane.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (4)
1. The method for dismantling the high-altitude large-span roof truss is characterized by comprising the following steps of:
step S1, setting a supporting and reinforcing measure below a lower chord (2) of a roof, wherein the supporting and reinforcing measure is a reinforcing diagonal (7), the top end of the reinforcing diagonal (7) is welded and fixed at the junction of a main lower chord beam (201) and a secondary lower chord beam (202) of the lower chord (2) of the roof, and the bottom end of the reinforcing diagonal (7) is welded and fixed on a structural beam (6) below a lower structural floor slab (4);
step S2, paving a steel springboard above the lower chord (2) of the roof as a construction platform, or taking an existing structural floor slab (4) above the lower chord (2) of the roof as a construction platform, and simultaneously dismantling the upper chord (1) of the roof and the web members (3) of the roof at each point on the construction platform in a large area, wherein the dismantling process of the upper chord (1) of the roof and the web members (3) of the roof in the step S2 specifically comprises the following steps,
s21, welding a holding pole (8) at the top of a rod piece junction of a roof upper chord (1), and welding a lifting lug (9) on the holding pole (8);
s22, welding lifting lugs (9) at two ends of an upper chord diagonal (103) of a roof upper chord (1), hanging a chain block (10) between the lifting lugs (9) arranged at the end parts of the upper chord diagonal (103) and the lifting lugs (9) arranged on the holding poles (8) at corresponding positions, cutting off the end parts of the upper chord diagonal (103), and lowering the cut upper chord diagonal (103) to a construction platform for carrying away through the cooperation of the chain blocks (10) at two sides;
s23, segmenting the upper string secondary beams (102) of the roof upper string (1) according to spans, welding lifting lugs (9) at two ends of each segment of upper string secondary beams (102), hanging a chain block (10) between the lifting lugs (9) arranged at the end parts of the single-segment upper string secondary beams (102) and the lifting lugs (9) arranged on the holding poles (8) at corresponding positions, cutting off the single-segment upper string secondary beams (102) along the end parts, and lowering the cut upper string secondary beams (102) to a construction platform to be carried away through the cooperation of the chain blocks (10) at two sides;
step S24, determining a straight web member (301) needing to be removed preferentially, welding lifting lugs (9) at two ends of the straight web member (301) and all inclined web members (302) needing to be removed preferentially, correspondingly welding the lifting lugs (9) at the bottoms of the upper chord main beams (101) above the end lifting lugs (9) of the straight web member (301) and the inclined web member (302), hanging a chain block (10) between the straight web member (301) and the lifting lugs (9) corresponding to the upper chord main beams (101) or between the inclined web member (302) and the lifting lugs (9) corresponding to the upper chord main beams (101), cutting the straight web member (301) or the inclined web member (302) along the end, and lowering the cut straight web member (301) or the cut inclined web member (302) to a construction platform through the cooperation of the chain blocks (10) at two sides for carrying away;
step S25, the remaining straight web members (301) are paired in pairs, and form a door-shaped frame with the upper chord main beams (101) at the top ends of the two pairs;
s26, welding lifting lugs (9) at two ends of an upper chord main beam (101) which is not drawn into a door-shaped frame section, hanging a chain block (10) between the lifting lugs (9) arranged at the end parts of the upper chord main beam (101) and the lifting lugs (9) arranged on the holding poles (8) at corresponding positions, cutting off the end parts of the upper chord main beam (101) which is not drawn into the door-shaped frame section, and lowering the cut upper chord inclined struts (103) to a construction platform for carrying by matching the chain blocks (10) at two sides;
s27, dismantling the straight web members (301) corresponding to the gate-type frames and the upper chord main beams (101) together by means of a tower crane;
s3, removing a construction platform above the lower chord (2) of the roof;
and S4, removing the lower chord (2) of the roof and supporting and reinforcing measures.
2. The method for removing the high-altitude large-span roof truss according to claim 1, wherein the removing process of the construction platform in the form of the existing structural floor slab (4) in the step S3 specifically comprises the following steps:
s31, dividing the structural floor slab (4) into a plurality of unit cutting plates;
s32, forming through holes (12) on the unit cutting plate according to design point positions;
s33, additionally arranging two hoisting steel beams (11) below the unit cutting plate, supporting the unit cutting plate by the two hoisting steel beams (11), and enabling lifting lugs (9) welded at the end parts of each hoisting steel beam (11) to protrude from the through holes (12);
s34, hooking a lifting hook of the tower crane to a lifting lug (9) for lifting the steel beam (11);
and S35, cutting the unit cutting plate from the structural floor slab (4) and lifting the unit cutting plate away through a tower crane.
3. The method for removing a high-altitude large-span roof truss according to claim 2, wherein said step S35 comprises the steps of:
step S351, cutting the non-stressed direction of the plate by a water saw cutting unit;
step S352, the tower crane lifts up the unit cutting plate through four lifting lugs (9);
step S353, two water saws cut two edges of the plate in the stress direction at the same time by the cutting unit;
and S354, hoisting the cut unit cutting plate by using a tower crane after cutting is completed.
4. The method for removing the high-altitude large-span roof truss according to claim 1, wherein the removing process of the roof lower chord (2) in the step S4 specifically comprises the following steps:
s41, welding a holding pole (8) at the top of a rod piece junction of a lower chord (2) of the roof, and welding a lifting lug (9) on the holding pole (8);
s42, welding lifting lugs (9) at two ends of a lower chord diagonal (203) of a lower chord (2) of the roof, hanging a chain block (10) between the lifting lugs (9) arranged at the end parts of the lower chord diagonal (203) and the lifting lugs (9) arranged on the holding poles (8) at corresponding positions, cutting off the end parts of the lower chord diagonal (203), and lowering the cut lower chord diagonal (203) to a lower structure floor slab (4) through the cooperation of the chain blocks (10) at two sides for carrying away;
s43, segmenting a lower string secondary beam (202) of a roof lower string (2) according to a span, welding lifting lugs (9) at two ends of each segment of lower string secondary beam (202), hanging a chain block (10) between the lifting lugs (9) arranged at the end parts of the single-segment lower string secondary beams (202) and the lifting lugs (9) arranged on the holding poles (8) at corresponding positions, cutting off the single-segment lower string secondary beams (202) along the end parts, and lowering the cut lower string secondary beams (202) to a lower layer structure floor slab (4) through the cooperation of the chain blocks (10) at two sides for carrying away;
s44, segmenting a lower chord main beam (201) of a roof lower chord (2) according to a span, wherein a segment comprising a reinforcing diagonal (7) is required to shorten the segment lower chord main beam (201) to the outer side of the projection range of the reinforcing diagonal (7), lifting lugs (9) are welded at two ends of each segment of lower chord main beam (201), a chain block (10) is hung between the lifting lugs (9) arranged at the end parts of the single segment lower chord main beams (201) and the lifting lugs (9) arranged on the corresponding position holding rods (8), and the single segment lower chord main beams (201) are cut off along the end parts and are matched through the chain blocks (10) at two sides to be placed down to a lower layer structure floor slab (4) for transportation;
and S45, dismantling the reinforcing diagonal brace (7) and the lower chord main girder (201) together by means of a tower crane.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102486051A (en) * | 2010-12-06 | 2012-06-06 | 中冶天工集团有限公司 | Manual demolishing method of large-area spherical net rack |
| JP2018150753A (en) * | 2017-03-14 | 2018-09-27 | 鹿島建設株式会社 | Method for dismantling roof of building |
| CN114856245A (en) * | 2022-05-23 | 2022-08-05 | 中建钢构工程有限公司 | Method for dismantling net rack |
| CN115538817A (en) * | 2022-12-01 | 2022-12-30 | 北京市第三建筑工程有限公司 | Dismantling system and construction method for cantilever structure of high-rise building |
| CN116181112A (en) * | 2023-03-31 | 2023-05-30 | 上海市机械施工集团有限公司 | Method for dismantling and installing large-span roof and grid steel structure |
| CN116290905A (en) * | 2023-03-31 | 2023-06-23 | 上海市机械施工集团有限公司 | Roof steel structure reconstruction method |
-
2023
- 2023-11-23 CN CN202311566353.3A patent/CN117266627B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102486051A (en) * | 2010-12-06 | 2012-06-06 | 中冶天工集团有限公司 | Manual demolishing method of large-area spherical net rack |
| JP2018150753A (en) * | 2017-03-14 | 2018-09-27 | 鹿島建設株式会社 | Method for dismantling roof of building |
| CN114856245A (en) * | 2022-05-23 | 2022-08-05 | 中建钢构工程有限公司 | Method for dismantling net rack |
| CN115538817A (en) * | 2022-12-01 | 2022-12-30 | 北京市第三建筑工程有限公司 | Dismantling system and construction method for cantilever structure of high-rise building |
| CN116181112A (en) * | 2023-03-31 | 2023-05-30 | 上海市机械施工集团有限公司 | Method for dismantling and installing large-span roof and grid steel structure |
| CN116290905A (en) * | 2023-03-31 | 2023-06-23 | 上海市机械施工集团有限公司 | Roof steel structure reconstruction method |
Non-Patent Citations (3)
| Title |
|---|
| 3D扫描逆向建模技术与MR设备在既有建筑球形钢网架拆除中的应用;徐巍;王玉泽;童晶;肖晓娇;王玲;;施工技术(第22期);全文 * |
| 横梁支模桁架系统高空拆除技术;徐佩华;;建筑施工(第04期);全文 * |
| 首钢高强度机械制造用钢生产线主厂房屋面网架拆除施工技术;阮新伟;;建筑技术(第05期);全文 * |
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